From 25621bcc89762fe1329ae9c9dab75bc70ef1aee0 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:43 +0100
Subject: [PATCH 01/33] HID: Kconfig: split HID support and hid-core
 compilation

Currently, we step into drivers/hid/ based on the value of
CONFIG_HID.

However, that value is a tristate, meaning that it can be a module.

As per the documentation, if we jump into the subdirectory by
following an obj-m, we can not compile anything inside that
subdirectory in vmlinux. It is considered as a bug.

To make things more friendly to HID-BPF, split HID (the HID core
parameter) from HID_SUPPORT (do we want any kind of HID support in the
system?), and make this new config a boolean.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/Makefile                |  2 +-
 drivers/hid/Kconfig             | 16 +++++++++++-----
 drivers/hid/amd-sfh-hid/Kconfig |  2 +-
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/Makefile b/drivers/Makefile
index bdf1c66141c9..cf5d8b86da8f 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -137,7 +137,7 @@ obj-$(CONFIG_CRYPTO)		+= crypto/
 obj-$(CONFIG_SUPERH)		+= sh/
 obj-y				+= clocksource/
 obj-$(CONFIG_DCA)		+= dca/
-obj-$(CONFIG_HID)		+= hid/
+obj-$(CONFIG_HID_SUPPORT)	+= hid/
 obj-$(CONFIG_PPC_PS3)		+= ps3/
 obj-$(CONFIG_OF)		+= of/
 obj-$(CONFIG_SSB)		+= ssb/
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 185a077d59cd..72bbf9899993 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -2,12 +2,18 @@
 #
 # HID driver configuration
 #
-menu "HID support"
-     depends on INPUT
+menuconfig HID_SUPPORT
+	bool "HID bus support"
+	default y
+	depends on INPUT
+	help
+	  This option adds core support for human interface device (HID).
+	  You will also need drivers from the following menu to make use of it.
+
+if HID_SUPPORT
 
 config HID
-	tristate "HID bus support"
-	depends on INPUT
+	tristate "HID bus core support"
 	default y
 	help
 	  A human interface device (HID) is a type of computer device that
@@ -1290,4 +1296,4 @@ source "drivers/hid/amd-sfh-hid/Kconfig"
 
 source "drivers/hid/surface-hid/Kconfig"
 
-endmenu
+endif # HID_SUPPORT
diff --git a/drivers/hid/amd-sfh-hid/Kconfig b/drivers/hid/amd-sfh-hid/Kconfig
index db069a83e9a2..56e473fc3c93 100644
--- a/drivers/hid/amd-sfh-hid/Kconfig
+++ b/drivers/hid/amd-sfh-hid/Kconfig
@@ -2,10 +2,10 @@
 menu "AMD SFH HID Support"
 	depends on X86_64 || COMPILE_TEST
 	depends on PCI
-	depends on HID
 
 config AMD_SFH_HID
 	tristate "AMD Sensor Fusion Hub"
+	select HID
 	help
 	  If you say yes to this option, support will be included for the
 	  AMD Sensor Fusion Hub.

From f5c27da4e3c8a2e42fb4f41a0c685debcb9af294 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:44 +0100
Subject: [PATCH 02/33] HID: initial BPF implementation

Declare an entry point that can use fmod_ret BPF programs, and
also an API to access and change the incoming data.

A simpler implementation would consist in just calling
hid_bpf_device_event() for any incoming event and let users deal
with the fact that they will be called for any event of any device.

The goal of HID-BPF is to partially replace drivers, so this situation
can be problematic because we might have programs which will step on
each other toes.

For that, we add a new API hid_bpf_attach_prog() that can be called
from a syscall and we manually deal with a jump table in hid-bpf.

Whenever we add a program to the jump table (in other words, when we
attach a program to a HID device), we keep the number of time we added
this program in the jump table so we can release it whenever there are
no other users.

HID devices have an RCU protected list of available programs in the
jump table, and those programs are called one after the other thanks
to bpf_tail_call().

To achieve the detection of users losing their fds on the programs we
attached, we add 2 tracing facilities on bpf_prog_release() (for when
a fd is closed) and bpf_free_inode() (for when a pinned program gets
unpinned).

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/Kconfig                           |   2 +
 drivers/hid/Makefile                          |   2 +
 drivers/hid/bpf/Kconfig                       |  17 +
 drivers/hid/bpf/Makefile                      |  11 +
 drivers/hid/bpf/entrypoints/Makefile          |  93 +++
 drivers/hid/bpf/entrypoints/README            |   4 +
 drivers/hid/bpf/entrypoints/entrypoints.bpf.c |  66 ++
 .../hid/bpf/entrypoints/entrypoints.lskel.h   | 648 ++++++++++++++++++
 drivers/hid/bpf/hid_bpf_dispatch.c            | 223 ++++++
 drivers/hid/bpf/hid_bpf_dispatch.h            |  27 +
 drivers/hid/bpf/hid_bpf_jmp_table.c           | 568 +++++++++++++++
 drivers/hid/hid-core.c                        |  21 +
 include/linux/hid.h                           |   5 +
 include/linux/hid_bpf.h                       | 117 ++++
 14 files changed, 1804 insertions(+)
 create mode 100644 drivers/hid/bpf/Kconfig
 create mode 100644 drivers/hid/bpf/Makefile
 create mode 100644 drivers/hid/bpf/entrypoints/Makefile
 create mode 100644 drivers/hid/bpf/entrypoints/README
 create mode 100644 drivers/hid/bpf/entrypoints/entrypoints.bpf.c
 create mode 100644 drivers/hid/bpf/entrypoints/entrypoints.lskel.h
 create mode 100644 drivers/hid/bpf/hid_bpf_dispatch.c
 create mode 100644 drivers/hid/bpf/hid_bpf_dispatch.h
 create mode 100644 drivers/hid/bpf/hid_bpf_jmp_table.c
 create mode 100644 include/linux/hid_bpf.h

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 72bbf9899993..ff40c18f4a2b 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -1284,6 +1284,8 @@ config HID_KUNIT_TEST
 
 endmenu
 
+source "drivers/hid/bpf/Kconfig"
+
 endif # HID
 
 source "drivers/hid/usbhid/Kconfig"
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index e8014c1a2f8b..c45b516eb767 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -5,6 +5,8 @@
 hid-y			:= hid-core.o hid-input.o hid-quirks.o
 hid-$(CONFIG_DEBUG_FS)		+= hid-debug.o
 
+obj-$(CONFIG_HID_BPF)		+= bpf/
+
 obj-$(CONFIG_HID)		+= hid.o
 obj-$(CONFIG_UHID)		+= uhid.o
 
diff --git a/drivers/hid/bpf/Kconfig b/drivers/hid/bpf/Kconfig
new file mode 100644
index 000000000000..298634fc3335
--- /dev/null
+++ b/drivers/hid/bpf/Kconfig
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "HID-BPF support"
+
+config HID_BPF
+	bool "HID-BPF support"
+	default HID_SUPPORT
+	depends on BPF && BPF_SYSCALL
+	help
+	This option allows to support eBPF programs on the HID subsystem.
+	eBPF programs can fix HID devices in a lighter way than a full
+	kernel patch and allow a lot more flexibility.
+
+	For documentation, see Documentation/hid/hid-bpf.rst
+
+	If unsure, say Y.
+
+endmenu
diff --git a/drivers/hid/bpf/Makefile b/drivers/hid/bpf/Makefile
new file mode 100644
index 000000000000..cf55120cf7d6
--- /dev/null
+++ b/drivers/hid/bpf/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for HID-BPF
+#
+
+LIBBPF_INCLUDE = $(srctree)/tools/lib
+
+obj-$(CONFIG_HID_BPF) += hid_bpf.o
+CFLAGS_hid_bpf_dispatch.o += -I$(LIBBPF_INCLUDE)
+CFLAGS_hid_bpf_jmp_table.o += -I$(LIBBPF_INCLUDE)
+hid_bpf-objs += hid_bpf_dispatch.o hid_bpf_jmp_table.o
diff --git a/drivers/hid/bpf/entrypoints/Makefile b/drivers/hid/bpf/entrypoints/Makefile
new file mode 100644
index 000000000000..a12edcfa4fe3
--- /dev/null
+++ b/drivers/hid/bpf/entrypoints/Makefile
@@ -0,0 +1,93 @@
+# SPDX-License-Identifier: GPL-2.0
+OUTPUT := .output
+abs_out := $(abspath $(OUTPUT))
+
+CLANG ?= clang
+LLC ?= llc
+LLVM_STRIP ?= llvm-strip
+
+TOOLS_PATH := $(abspath ../../../../tools)
+BPFTOOL_SRC := $(TOOLS_PATH)/bpf/bpftool
+BPFTOOL_OUTPUT := $(abs_out)/bpftool
+DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
+BPFTOOL ?= $(DEFAULT_BPFTOOL)
+
+LIBBPF_SRC := $(TOOLS_PATH)/lib/bpf
+LIBBPF_OUTPUT := $(abs_out)/libbpf
+LIBBPF_DESTDIR := $(LIBBPF_OUTPUT)
+LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)/include
+BPFOBJ := $(LIBBPF_OUTPUT)/libbpf.a
+
+INCLUDES := -I$(OUTPUT) -I$(LIBBPF_INCLUDE) -I$(TOOLS_PATH)/include/uapi
+CFLAGS := -g -Wall
+
+VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)				\
+		     $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)	\
+		     ../../../../vmlinux				\
+		     /sys/kernel/btf/vmlinux				\
+		     /boot/vmlinux-$(shell uname -r)
+VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
+ifeq ($(VMLINUX_BTF),)
+$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
+endif
+
+ifeq ($(V),1)
+Q =
+msg =
+else
+Q = @
+msg = @printf '  %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
+MAKEFLAGS += --no-print-directory
+submake_extras := feature_display=0
+endif
+
+.DELETE_ON_ERROR:
+
+.PHONY: all clean
+
+all: entrypoints.lskel.h
+
+clean:
+	$(call msg,CLEAN)
+	$(Q)rm -rf $(OUTPUT) entrypoints
+
+entrypoints.lskel.h: $(OUTPUT)/entrypoints.bpf.o | $(BPFTOOL)
+	$(call msg,GEN-SKEL,$@)
+	$(Q)$(BPFTOOL) gen skeleton -L $< > $@
+
+
+$(OUTPUT)/entrypoints.bpf.o: entrypoints.bpf.c $(OUTPUT)/vmlinux.h $(BPFOBJ) | $(OUTPUT)
+	$(call msg,BPF,$@)
+	$(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES)			      \
+		 -c $(filter %.c,$^) -o $@ &&				      \
+	$(LLVM_STRIP) -g $@
+
+$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
+ifeq ($(VMLINUX_H),)
+	$(call msg,GEN,,$@)
+	$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
+else
+	$(call msg,CP,,$@)
+	$(Q)cp "$(VMLINUX_H)" $@
+endif
+
+$(OUTPUT) $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
+	$(call msg,MKDIR,$@)
+	$(Q)mkdir -p $@
+
+$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)
+	$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC)			       \
+		    OUTPUT=$(abspath $(dir $@))/ prefix=		       \
+		    DESTDIR=$(LIBBPF_DESTDIR) $(abspath $@) install_headers
+
+ifeq ($(CROSS_COMPILE),)
+$(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT)
+	$(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC)			       \
+		    OUTPUT=$(BPFTOOL_OUTPUT)/				       \
+		    LIBBPF_BOOTSTRAP_OUTPUT=$(LIBBPF_OUTPUT)/		       \
+		    LIBBPF_BOOTSTRAP_DESTDIR=$(LIBBPF_DESTDIR)/ bootstrap
+else
+$(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT)
+	$(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC)			       \
+		    OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
+endif
diff --git a/drivers/hid/bpf/entrypoints/README b/drivers/hid/bpf/entrypoints/README
new file mode 100644
index 000000000000..147e0d41509f
--- /dev/null
+++ b/drivers/hid/bpf/entrypoints/README
@@ -0,0 +1,4 @@
+WARNING:
+If you change "entrypoints.bpf.c" do "make -j" in this directory to rebuild "entrypoints.skel.h".
+Make sure to have clang 10 installed.
+See Documentation/bpf/bpf_devel_QA.rst
diff --git a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
new file mode 100644
index 000000000000..41dd66d5fc7a
--- /dev/null
+++ b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Benjamin Tissoires */
+
+#include ".output/vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+#define HID_BPF_MAX_PROGS 1024
+
+extern bool call_hid_bpf_prog_release(u64 prog, int table_cnt) __ksym;
+
+struct {
+	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
+	__uint(max_entries, HID_BPF_MAX_PROGS);
+	__uint(key_size, sizeof(__u32));
+	__uint(value_size, sizeof(__u32));
+} hid_jmp_table SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__uint(max_entries, HID_BPF_MAX_PROGS * HID_BPF_PROG_TYPE_MAX);
+	__type(key, void *);
+	__type(value, __u8);
+} progs_map SEC(".maps");
+
+SEC("fmod_ret/__hid_bpf_tail_call")
+int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
+{
+	bpf_tail_call(ctx, &hid_jmp_table, hctx->index);
+
+	return 0;
+}
+
+static void release_prog(u64 prog)
+{
+	u8 *value;
+
+	value = bpf_map_lookup_elem(&progs_map, &prog);
+	if (!value)
+		return;
+
+	if (call_hid_bpf_prog_release(prog, *value))
+		bpf_map_delete_elem(&progs_map, &prog);
+}
+
+SEC("fexit/bpf_prog_release")
+int BPF_PROG(hid_prog_release, struct inode *inode, struct file *filp)
+{
+	u64 prog = (u64)filp->private_data;
+
+	release_prog(prog);
+
+	return 0;
+}
+
+SEC("fexit/bpf_free_inode")
+int BPF_PROG(hid_free_inode, struct inode *inode)
+{
+	u64 prog = (u64)inode->i_private;
+
+	release_prog(prog);
+
+	return 0;
+}
+
+char LICENSE[] SEC("license") = "GPL";
diff --git a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
new file mode 100644
index 000000000000..aa7b7ab31abb
--- /dev/null
+++ b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
@@ -0,0 +1,648 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
+#ifndef __ENTRYPOINTS_BPF_SKEL_H__
+#define __ENTRYPOINTS_BPF_SKEL_H__
+
+#include <bpf/skel_internal.h>
+
+struct entrypoints_bpf {
+	struct bpf_loader_ctx ctx;
+	struct {
+		struct bpf_map_desc hid_jmp_table;
+		struct bpf_map_desc progs_map;
+	} maps;
+	struct {
+		struct bpf_prog_desc hid_tail_call;
+		struct bpf_prog_desc hid_prog_release;
+		struct bpf_prog_desc hid_free_inode;
+	} progs;
+	struct {
+		int hid_tail_call_fd;
+		int hid_prog_release_fd;
+		int hid_free_inode_fd;
+	} links;
+};
+
+static inline int
+entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel)
+{
+	int prog_fd = skel->progs.hid_tail_call.prog_fd;
+	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+	if (fd > 0)
+		skel->links.hid_tail_call_fd = fd;
+	return fd;
+}
+
+static inline int
+entrypoints_bpf__hid_prog_release__attach(struct entrypoints_bpf *skel)
+{
+	int prog_fd = skel->progs.hid_prog_release.prog_fd;
+	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+	if (fd > 0)
+		skel->links.hid_prog_release_fd = fd;
+	return fd;
+}
+
+static inline int
+entrypoints_bpf__hid_free_inode__attach(struct entrypoints_bpf *skel)
+{
+	int prog_fd = skel->progs.hid_free_inode.prog_fd;
+	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+	if (fd > 0)
+		skel->links.hid_free_inode_fd = fd;
+	return fd;
+}
+
+static inline int
+entrypoints_bpf__attach(struct entrypoints_bpf *skel)
+{
+	int ret = 0;
+
+	ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel);
+	ret = ret < 0 ? ret : entrypoints_bpf__hid_prog_release__attach(skel);
+	ret = ret < 0 ? ret : entrypoints_bpf__hid_free_inode__attach(skel);
+	return ret < 0 ? ret : 0;
+}
+
+static inline void
+entrypoints_bpf__detach(struct entrypoints_bpf *skel)
+{
+	skel_closenz(skel->links.hid_tail_call_fd);
+	skel_closenz(skel->links.hid_prog_release_fd);
+	skel_closenz(skel->links.hid_free_inode_fd);
+}
+static void
+entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
+{
+	if (!skel)
+		return;
+	entrypoints_bpf__detach(skel);
+	skel_closenz(skel->progs.hid_tail_call.prog_fd);
+	skel_closenz(skel->progs.hid_prog_release.prog_fd);
+	skel_closenz(skel->progs.hid_free_inode.prog_fd);
+	skel_closenz(skel->maps.hid_jmp_table.map_fd);
+	skel_closenz(skel->maps.progs_map.map_fd);
+	skel_free(skel);
+}
+static inline struct entrypoints_bpf *
+entrypoints_bpf__open(void)
+{
+	struct entrypoints_bpf *skel;
+
+	skel = skel_alloc(sizeof(*skel));
+	if (!skel)
+		goto cleanup;
+	skel->ctx.sz = (void *)&skel->links - (void *)skel;
+	return skel;
+cleanup:
+	entrypoints_bpf__destroy(skel);
+	return NULL;
+}
+
+static inline int
+entrypoints_bpf__load(struct entrypoints_bpf *skel)
+{
+	struct bpf_load_and_run_opts opts = {};
+	int err;
+
+	opts.ctx = (struct bpf_loader_ctx *)skel;
+	opts.data_sz = 10624;
+	opts.data = (void *)"\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
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+	opts.insns_sz = 3152;
+	opts.insns = (void *)"\
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+\0\0\0\0\x63\x78\x04\0\0\0\0\0\xbf\x79\0\0\0\0\0\0\x77\x09\0\0\x20\0\0\0\x55\
+\x09\x02\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x04\0\0\0\0\0\x18\x60\0\0\0\0\0\
+\0\0\0\0\0\0\x01\0\0\x63\x90\0\0\0\0\0\0\x6a\x08\x02\0\x40\0\0\0\xb7\x01\0\0\
+\x05\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\xc0\x28\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\
+\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\x61\
+\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\
+\x18\x60\0\0\0\0\0\0\0\0\0\0\x30\x29\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\
+\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\x92\xfe\0\0\0\0\x63\x7a\
+\x88\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\
+\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\x06\x38\0\0\0\0\0\x61\xa0\
+\x84\xff\0\0\0\0\x63\x06\x3c\0\0\0\0\0\x61\xa0\x88\xff\0\0\0\0\x63\x06\x40\0\0\
+\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\
+\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x28\0\
+\0\0\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
+	err = bpf_load_and_run(&opts);
+	if (err < 0)
+		return err;
+	return 0;
+}
+
+static inline struct entrypoints_bpf *
+entrypoints_bpf__open_and_load(void)
+{
+	struct entrypoints_bpf *skel;
+
+	skel = entrypoints_bpf__open();
+	if (!skel)
+		return NULL;
+	if (entrypoints_bpf__load(skel)) {
+		entrypoints_bpf__destroy(skel);
+		return NULL;
+	}
+	return skel;
+}
+
+__attribute__((unused)) static void
+entrypoints_bpf__assert(struct entrypoints_bpf *s __attribute__((unused)))
+{
+#ifdef __cplusplus
+#define _Static_assert static_assert
+#endif
+#ifdef __cplusplus
+#undef _Static_assert
+#endif
+}
+
+#endif /* __ENTRYPOINTS_BPF_SKEL_H__ */
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
new file mode 100644
index 000000000000..600b00fdf6c1
--- /dev/null
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ *  HID-BPF support for Linux
+ *
+ *  Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/bitops.h>
+#include <linux/btf.h>
+#include <linux/btf_ids.h>
+#include <linux/filter.h>
+#include <linux/hid.h>
+#include <linux/hid_bpf.h>
+#include <linux/init.h>
+#include <linux/kfifo.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include "hid_bpf_dispatch.h"
+#include "entrypoints/entrypoints.lskel.h"
+
+struct hid_bpf_ops *hid_bpf_ops;
+EXPORT_SYMBOL(hid_bpf_ops);
+
+/**
+ * hid_bpf_device_event - Called whenever an event is coming in from the device
+ *
+ * @ctx: The HID-BPF context
+ *
+ * @return %0 on success and keep processing; a negative error code to interrupt
+ * the processing of this event
+ *
+ * Declare an %fmod_ret tracing bpf program to this function and attach this
+ * program through hid_bpf_attach_prog() to have this helper called for
+ * any incoming event from the device itself.
+ *
+ * The function is called while on IRQ context, so we can not sleep.
+ */
+/* never used by the kernel but declared so we can load and attach a tracepoint */
+__weak noinline int hid_bpf_device_event(struct hid_bpf_ctx *ctx)
+{
+	return 0;
+}
+ALLOW_ERROR_INJECTION(hid_bpf_device_event, ERRNO);
+
+int
+dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type, u8 *data,
+			      u32 size, int interrupt)
+{
+	struct hid_bpf_ctx_kern ctx_kern = {
+		.ctx = {
+			.hid = hdev,
+			.report_type = type,
+			.size = size,
+		},
+		.data = data,
+	};
+
+	if (type >= HID_REPORT_TYPES)
+		return -EINVAL;
+
+	return hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
+}
+EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event);
+
+/**
+ * hid_bpf_get_data - Get the kernel memory pointer associated with the context @ctx
+ *
+ * @ctx: The HID-BPF context
+ * @offset: The offset within the memory
+ * @rdwr_buf_size: the const size of the buffer
+ *
+ * @returns %NULL on error, an %__u8 memory pointer on success
+ */
+noinline __u8 *
+hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr_buf_size)
+{
+	struct hid_bpf_ctx_kern *ctx_kern;
+
+	if (!ctx)
+		return NULL;
+
+	ctx_kern = container_of(ctx, struct hid_bpf_ctx_kern, ctx);
+
+	if (rdwr_buf_size + offset > ctx->size)
+		return NULL;
+
+	return ctx_kern->data + offset;
+}
+
+/*
+ * The following set contains all functions we agree BPF programs
+ * can use.
+ */
+BTF_SET8_START(hid_bpf_kfunc_ids)
+BTF_ID_FLAGS(func, call_hid_bpf_prog_release)
+BTF_ID_FLAGS(func, hid_bpf_get_data, KF_RET_NULL)
+BTF_SET8_END(hid_bpf_kfunc_ids)
+
+static const struct btf_kfunc_id_set hid_bpf_kfunc_set = {
+	.owner = THIS_MODULE,
+	.set   = &hid_bpf_kfunc_ids,
+};
+
+static int device_match_id(struct device *dev, const void *id)
+{
+	struct hid_device *hdev = to_hid_device(dev);
+
+	return hdev->id == *(int *)id;
+}
+
+/**
+ * hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device
+ *
+ * @hid_id: the system unique identifier of the HID device
+ * @prog_fd: an fd in the user process representing the program to attach
+ * @flags: any logical OR combination of &enum hid_bpf_attach_flags
+ *
+ * @returns %0 on success, an error code otherwise.
+ */
+/* called from syscall */
+noinline int
+hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
+{
+	struct hid_device *hdev;
+	struct device *dev;
+	int prog_type = hid_bpf_get_prog_attach_type(prog_fd);
+
+	if (!hid_bpf_ops)
+		return -EINVAL;
+
+	if (prog_type < 0)
+		return prog_type;
+
+	if (prog_type >= HID_BPF_PROG_TYPE_MAX)
+		return -EINVAL;
+
+	if ((flags & ~HID_BPF_FLAG_MASK))
+		return -EINVAL;
+
+	dev = bus_find_device(hid_bpf_ops->bus_type, NULL, &hid_id, device_match_id);
+	if (!dev)
+		return -EINVAL;
+
+	hdev = to_hid_device(dev);
+
+	return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
+}
+
+/* for syscall HID-BPF */
+BTF_SET8_START(hid_bpf_syscall_kfunc_ids)
+BTF_ID_FLAGS(func, hid_bpf_attach_prog)
+BTF_SET8_END(hid_bpf_syscall_kfunc_ids)
+
+static const struct btf_kfunc_id_set hid_bpf_syscall_kfunc_set = {
+	.owner = THIS_MODULE,
+	.set   = &hid_bpf_syscall_kfunc_ids,
+};
+
+void hid_bpf_destroy_device(struct hid_device *hdev)
+{
+	if (!hdev)
+		return;
+
+	/* mark the device as destroyed in bpf so we don't reattach it */
+	hdev->bpf.destroyed = true;
+
+	__hid_bpf_destroy_device(hdev);
+}
+EXPORT_SYMBOL_GPL(hid_bpf_destroy_device);
+
+void hid_bpf_device_init(struct hid_device *hdev)
+{
+	spin_lock_init(&hdev->bpf.progs_lock);
+}
+EXPORT_SYMBOL_GPL(hid_bpf_device_init);
+
+static int __init hid_bpf_init(void)
+{
+	int err;
+
+	/* Note: if we exit with an error any time here, we would entirely break HID, which
+	 * is probably not something we want. So we log an error and return success.
+	 *
+	 * This is not a big deal: the syscall allowing to attach a BPF program to a HID device
+	 * will not be available, so nobody will be able to use the functionality.
+	 */
+
+	err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set);
+	if (err) {
+		pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
+		return 0;
+	}
+
+	err = hid_bpf_preload_skel();
+	if (err) {
+		pr_warn("error while preloading HID BPF dispatcher: %d", err);
+		return 0;
+	}
+
+	/* register syscalls after we are sure we can load our preloaded bpf program */
+	err = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &hid_bpf_syscall_kfunc_set);
+	if (err) {
+		pr_warn("error while setting HID BPF syscall kfuncs: %d", err);
+		return 0;
+	}
+
+	return 0;
+}
+
+static void __exit hid_bpf_exit(void)
+{
+	/* HID depends on us, so if we hit that code, we are guaranteed that hid
+	 * has been removed and thus we do not need to clear the HID devices
+	 */
+	hid_bpf_free_links_and_skel();
+}
+
+late_initcall(hid_bpf_init);
+module_exit(hid_bpf_exit);
+MODULE_AUTHOR("Benjamin Tissoires");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h
new file mode 100644
index 000000000000..98c378e18b2b
--- /dev/null
+++ b/drivers/hid/bpf/hid_bpf_dispatch.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _BPF_HID_BPF_DISPATCH_H
+#define _BPF_HID_BPF_DISPATCH_H
+
+#include <linux/hid.h>
+
+struct hid_bpf_ctx_kern {
+	struct hid_bpf_ctx ctx;
+	u8 *data;
+};
+
+int hid_bpf_preload_skel(void);
+void hid_bpf_free_links_and_skel(void);
+int hid_bpf_get_prog_attach_type(int prog_fd);
+int __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type, int prog_fd,
+			  __u32 flags);
+void __hid_bpf_destroy_device(struct hid_device *hdev);
+int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
+		     struct hid_bpf_ctx_kern *ctx_kern);
+
+struct bpf_prog;
+
+/* HID-BPF internal kfuncs API */
+bool call_hid_bpf_prog_release(u64 prog, int table_cnt);
+
+#endif
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
new file mode 100644
index 000000000000..05225ff3cc27
--- /dev/null
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -0,0 +1,568 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ *  HID-BPF support for Linux
+ *
+ *  Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#include <linux/bitops.h>
+#include <linux/btf.h>
+#include <linux/btf_ids.h>
+#include <linux/circ_buf.h>
+#include <linux/filter.h>
+#include <linux/hid.h>
+#include <linux/hid_bpf.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include "hid_bpf_dispatch.h"
+#include "entrypoints/entrypoints.lskel.h"
+
+#define HID_BPF_MAX_PROGS 1024 /* keep this in sync with preloaded bpf,
+				* needs to be a power of 2 as we use it as
+				* a circular buffer
+				*/
+
+#define NEXT(idx) (((idx) + 1) & (HID_BPF_MAX_PROGS - 1))
+#define PREV(idx) (((idx) - 1) & (HID_BPF_MAX_PROGS - 1))
+
+/*
+ * represents one attached program stored in the hid jump table
+ */
+struct hid_bpf_prog_entry {
+	struct bpf_prog *prog;
+	struct hid_device *hdev;
+	enum hid_bpf_prog_type type;
+	u16 idx;
+};
+
+struct hid_bpf_jmp_table {
+	struct bpf_map *map;
+	struct bpf_map *prog_keys;
+	struct hid_bpf_prog_entry entries[HID_BPF_MAX_PROGS]; /* compacted list, circular buffer */
+	int tail, head;
+	struct bpf_prog *progs[HID_BPF_MAX_PROGS]; /* idx -> progs mapping */
+	unsigned long enabled[BITS_TO_LONGS(HID_BPF_MAX_PROGS)];
+};
+
+#define FOR_ENTRIES(__i, __start, __end) \
+	for (__i = __start; CIRC_CNT(__end, __i, HID_BPF_MAX_PROGS); __i = NEXT(__i))
+
+static struct hid_bpf_jmp_table jmp_table;
+
+static DEFINE_MUTEX(hid_bpf_attach_lock);		/* held when attaching/detaching programs */
+
+static void hid_bpf_release_progs(struct work_struct *work);
+
+static DECLARE_WORK(release_work, hid_bpf_release_progs);
+
+BTF_ID_LIST(hid_bpf_btf_ids)
+BTF_ID(func, hid_bpf_device_event)			/* HID_BPF_PROG_TYPE_DEVICE_EVENT */
+
+static int hid_bpf_max_programs(enum hid_bpf_prog_type type)
+{
+	switch (type) {
+	case HID_BPF_PROG_TYPE_DEVICE_EVENT:
+		return HID_BPF_MAX_PROGS_PER_DEV;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int hid_bpf_program_count(struct hid_device *hdev,
+				 struct bpf_prog *prog,
+				 enum hid_bpf_prog_type type)
+{
+	int i, n = 0;
+
+	if (type >= HID_BPF_PROG_TYPE_MAX)
+		return -EINVAL;
+
+	FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+		struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+		if (type != HID_BPF_PROG_TYPE_UNDEF && entry->type != type)
+			continue;
+
+		if (hdev && entry->hdev != hdev)
+			continue;
+
+		if (prog && entry->prog != prog)
+			continue;
+
+		n++;
+	}
+
+	return n;
+}
+
+__weak noinline int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx)
+{
+	return 0;
+}
+ALLOW_ERROR_INJECTION(__hid_bpf_tail_call, ERRNO);
+
+int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
+		     struct hid_bpf_ctx_kern *ctx_kern)
+{
+	struct hid_bpf_prog_list *prog_list;
+	int i, idx, err = 0;
+
+	rcu_read_lock();
+	prog_list = rcu_dereference(hdev->bpf.progs[type]);
+
+	if (!prog_list)
+		goto out_unlock;
+
+	for (i = 0; i < prog_list->prog_cnt; i++) {
+		idx = prog_list->prog_idx[i];
+
+		if (!test_bit(idx, jmp_table.enabled))
+			continue;
+
+		ctx_kern->ctx.index = idx;
+		err = __hid_bpf_tail_call(&ctx_kern->ctx);
+		if (err)
+			break;
+	}
+
+ out_unlock:
+	rcu_read_unlock();
+
+	return err;
+}
+
+/*
+ * assign the list of programs attached to a given hid device.
+ */
+static void __hid_bpf_set_hdev_progs(struct hid_device *hdev, struct hid_bpf_prog_list *new_list,
+				     enum hid_bpf_prog_type type)
+{
+	struct hid_bpf_prog_list *old_list;
+
+	spin_lock(&hdev->bpf.progs_lock);
+	old_list = rcu_dereference_protected(hdev->bpf.progs[type],
+					     lockdep_is_held(&hdev->bpf.progs_lock));
+	rcu_assign_pointer(hdev->bpf.progs[type], new_list);
+	spin_unlock(&hdev->bpf.progs_lock);
+	synchronize_rcu();
+
+	kfree(old_list);
+}
+
+/*
+ * allocate and populate the list of programs attached to a given hid device.
+ *
+ * Must be called under lock.
+ */
+static int hid_bpf_populate_hdev(struct hid_device *hdev, enum hid_bpf_prog_type type)
+{
+	struct hid_bpf_prog_list *new_list;
+	int i;
+
+	if (type >= HID_BPF_PROG_TYPE_MAX || !hdev)
+		return -EINVAL;
+
+	if (hdev->bpf.destroyed)
+		return 0;
+
+	new_list = kzalloc(sizeof(*new_list), GFP_KERNEL);
+	if (!new_list)
+		return -ENOMEM;
+
+	FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+		struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+		if (entry->type == type && entry->hdev == hdev &&
+		    test_bit(entry->idx, jmp_table.enabled))
+			new_list->prog_idx[new_list->prog_cnt++] = entry->idx;
+	}
+
+	__hid_bpf_set_hdev_progs(hdev, new_list, type);
+
+	return 0;
+}
+
+static void __hid_bpf_do_release_prog(int map_fd, unsigned int idx)
+{
+	skel_map_delete_elem(map_fd, &idx);
+	jmp_table.progs[idx] = NULL;
+}
+
+static void hid_bpf_release_progs(struct work_struct *work)
+{
+	int i, j, n, map_fd = -1;
+
+	if (!jmp_table.map)
+		return;
+
+	/* retrieve a fd of our prog_array map in BPF */
+	map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+	if (map_fd < 0)
+		return;
+
+	mutex_lock(&hid_bpf_attach_lock); /* protects against attaching new programs */
+
+	/* detach unused progs from HID devices */
+	FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+		struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+		enum hid_bpf_prog_type type;
+		struct hid_device *hdev;
+
+		if (test_bit(entry->idx, jmp_table.enabled))
+			continue;
+
+		/* we have an attached prog */
+		if (entry->hdev) {
+			hdev = entry->hdev;
+			type = entry->type;
+
+			hid_bpf_populate_hdev(hdev, type);
+
+			/* mark all other disabled progs from hdev of the given type as detached */
+			FOR_ENTRIES(j, i, jmp_table.head) {
+				struct hid_bpf_prog_entry *next;
+
+				next = &jmp_table.entries[j];
+
+				if (test_bit(next->idx, jmp_table.enabled))
+					continue;
+
+				if (next->hdev == hdev && next->type == type)
+					next->hdev = NULL;
+			}
+		}
+	}
+
+	/* remove all unused progs from the jump table */
+	FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+		struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+		if (test_bit(entry->idx, jmp_table.enabled))
+			continue;
+
+		if (entry->prog)
+			__hid_bpf_do_release_prog(map_fd, entry->idx);
+	}
+
+	/* compact the entry list */
+	n = jmp_table.tail;
+	FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+		struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+		if (!test_bit(entry->idx, jmp_table.enabled))
+			continue;
+
+		jmp_table.entries[n] = jmp_table.entries[i];
+		n = NEXT(n);
+	}
+
+	jmp_table.head = n;
+
+	mutex_unlock(&hid_bpf_attach_lock);
+
+	if (map_fd >= 0)
+		close_fd(map_fd);
+}
+
+static void hid_bpf_release_prog_at(int idx)
+{
+	int map_fd = -1;
+
+	/* retrieve a fd of our prog_array map in BPF */
+	map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+	if (map_fd < 0)
+		return;
+
+	__hid_bpf_do_release_prog(map_fd, idx);
+
+	close(map_fd);
+}
+
+/*
+ * Insert the given BPF program represented by its fd in the jmp table.
+ * Returns the index in the jump table or a negative error.
+ */
+static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
+{
+	int i, cnt, index = -1, map_fd = -1, progs_map_fd = -1, err = -EINVAL;
+
+	/* retrieve a fd of our prog_array map in BPF */
+	map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+	/* take an fd for the table of progs we monitor with SEC("fexit/bpf_prog_release") */
+	progs_map_fd = skel_map_get_fd_by_id(jmp_table.prog_keys->id);
+
+	if (map_fd < 0 || progs_map_fd < 0) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	cnt = 0;
+	/* find the first available index in the jmp_table
+	 * and count how many time this program has been inserted
+	 */
+	for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
+		if (!jmp_table.progs[i] && index < 0) {
+			/* mark the index as used */
+			jmp_table.progs[i] = prog;
+			index = i;
+			__set_bit(i, jmp_table.enabled);
+			cnt++;
+		} else {
+			if (jmp_table.progs[i] == prog)
+				cnt++;
+		}
+	}
+	if (index < 0) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	/* insert the program in the jump table */
+	err = skel_map_update_elem(map_fd, &index, &prog_fd, 0);
+	if (err)
+		goto out;
+
+	/* insert the program in the prog list table */
+	err = skel_map_update_elem(progs_map_fd, &prog, &cnt, 0);
+	if (err)
+		goto out;
+
+	/* return the index */
+	err = index;
+
+ out:
+	if (err < 0)
+		__hid_bpf_do_release_prog(map_fd, index);
+	if (map_fd >= 0)
+		close_fd(map_fd);
+	if (progs_map_fd >= 0)
+		close_fd(progs_map_fd);
+	return err;
+}
+
+int hid_bpf_get_prog_attach_type(int prog_fd)
+{
+	struct bpf_prog *prog = NULL;
+	int i;
+	int prog_type = HID_BPF_PROG_TYPE_UNDEF;
+
+	prog = bpf_prog_get(prog_fd);
+	if (IS_ERR(prog))
+		return PTR_ERR(prog);
+
+	for (i = 0; i < HID_BPF_PROG_TYPE_MAX; i++) {
+		if (hid_bpf_btf_ids[i] == prog->aux->attach_btf_id) {
+			prog_type = i;
+			break;
+		}
+	}
+
+	bpf_prog_put(prog);
+
+	return prog_type;
+}
+
+/* called from syscall */
+noinline int
+__hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
+		      int prog_fd, __u32 flags)
+{
+	struct bpf_prog *prog = NULL;
+	struct hid_bpf_prog_entry *prog_entry;
+	int cnt, err = -EINVAL, prog_idx = -1;
+
+	/* take a ref on the prog itself */
+	prog = bpf_prog_get(prog_fd);
+	if (IS_ERR(prog))
+		return PTR_ERR(prog);
+
+	mutex_lock(&hid_bpf_attach_lock);
+
+	/* do not attach too many programs to a given HID device */
+	cnt = hid_bpf_program_count(hdev, NULL, prog_type);
+	if (cnt < 0) {
+		err = cnt;
+		goto out_unlock;
+	}
+
+	if (cnt >= hid_bpf_max_programs(prog_type)) {
+		err = -E2BIG;
+		goto out_unlock;
+	}
+
+	prog_idx = hid_bpf_insert_prog(prog_fd, prog);
+	/* if the jmp table is full, abort */
+	if (prog_idx < 0) {
+		err = prog_idx;
+		goto out_unlock;
+	}
+
+	if (flags & HID_BPF_FLAG_INSERT_HEAD) {
+		/* take the previous prog_entry slot */
+		jmp_table.tail = PREV(jmp_table.tail);
+		prog_entry = &jmp_table.entries[jmp_table.tail];
+	} else {
+		/* take the next prog_entry slot */
+		prog_entry = &jmp_table.entries[jmp_table.head];
+		jmp_table.head = NEXT(jmp_table.head);
+	}
+
+	/* we steal the ref here */
+	prog_entry->prog = prog;
+	prog_entry->idx = prog_idx;
+	prog_entry->hdev = hdev;
+	prog_entry->type = prog_type;
+
+	/* finally store the index in the device list */
+	err = hid_bpf_populate_hdev(hdev, prog_type);
+	if (err)
+		hid_bpf_release_prog_at(prog_idx);
+
+ out_unlock:
+	mutex_unlock(&hid_bpf_attach_lock);
+
+	/* we only use prog as a key in the various tables, so we don't need to actually
+	 * increment the ref count.
+	 */
+	bpf_prog_put(prog);
+
+	return err;
+}
+
+void __hid_bpf_destroy_device(struct hid_device *hdev)
+{
+	int type, i;
+	struct hid_bpf_prog_list *prog_list;
+
+	rcu_read_lock();
+
+	for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++) {
+		prog_list = rcu_dereference(hdev->bpf.progs[type]);
+
+		if (!prog_list)
+			continue;
+
+		for (i = 0; i < prog_list->prog_cnt; i++)
+			__clear_bit(prog_list->prog_idx[i], jmp_table.enabled);
+	}
+
+	rcu_read_unlock();
+
+	for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++)
+		__hid_bpf_set_hdev_progs(hdev, NULL, type);
+
+	/* schedule release of all detached progs */
+	schedule_work(&release_work);
+}
+
+noinline bool
+call_hid_bpf_prog_release(u64 prog_key, int table_cnt)
+{
+	/* compare with how many refs are left in the bpf program */
+	struct bpf_prog *prog = (struct bpf_prog *)prog_key;
+	int idx;
+
+	if (!prog)
+		return false;
+
+	if (atomic64_read(&prog->aux->refcnt) != table_cnt)
+		return false;
+
+	/* we don't need locking here because the entries in the progs table
+	 * are stable:
+	 * if there are other users (and the progs entries might change), we
+	 * would return in the statement above.
+	 */
+	for (idx = 0; idx < HID_BPF_MAX_PROGS; idx++) {
+		if (jmp_table.progs[idx] == prog) {
+			__clear_bit(idx, jmp_table.enabled);
+			break;
+		}
+	}
+	if (idx >= HID_BPF_MAX_PROGS) {
+		/* should never happen if we get our refcount right */
+		idx = -1;
+	}
+
+	/* schedule release of all detached progs */
+	schedule_work(&release_work);
+	return idx >= 0;
+}
+
+#define HID_BPF_PROGS_COUNT 3
+
+static struct bpf_link *links[HID_BPF_PROGS_COUNT];
+static struct entrypoints_bpf *skel;
+
+void hid_bpf_free_links_and_skel(void)
+{
+	int i;
+
+	/* the following is enough to release all programs attached to hid */
+	if (jmp_table.prog_keys)
+		bpf_map_put_with_uref(jmp_table.prog_keys);
+
+	if (jmp_table.map)
+		bpf_map_put_with_uref(jmp_table.map);
+
+	for (i = 0; i < ARRAY_SIZE(links); i++) {
+		if (!IS_ERR_OR_NULL(links[i]))
+			bpf_link_put(links[i]);
+	}
+	entrypoints_bpf__destroy(skel);
+}
+
+#define ATTACH_AND_STORE_LINK(__name) do {					\
+	err = entrypoints_bpf__##__name##__attach(skel);			\
+	if (err)								\
+		goto out;							\
+										\
+	links[idx] = bpf_link_get_from_fd(skel->links.__name##_fd);		\
+	if (IS_ERR(links[idx])) {						\
+		err = PTR_ERR(links[idx]);					\
+		goto out;							\
+	}									\
+										\
+	/* Avoid taking over stdin/stdout/stderr of init process. Zeroing out	\
+	 * makes skel_closenz() a no-op later in iterators_bpf__destroy().	\
+	 */									\
+	close_fd(skel->links.__name##_fd);					\
+	skel->links.__name##_fd = 0;						\
+	idx++;									\
+} while (0)
+
+int hid_bpf_preload_skel(void)
+{
+	int err, idx = 0;
+
+	skel = entrypoints_bpf__open();
+	if (!skel)
+		return -ENOMEM;
+
+	err = entrypoints_bpf__load(skel);
+	if (err)
+		goto out;
+
+	jmp_table.map = bpf_map_get_with_uref(skel->maps.hid_jmp_table.map_fd);
+	if (IS_ERR(jmp_table.map)) {
+		err = PTR_ERR(jmp_table.map);
+		goto out;
+	}
+
+	jmp_table.prog_keys = bpf_map_get_with_uref(skel->maps.progs_map.map_fd);
+	if (IS_ERR(jmp_table.prog_keys)) {
+		err = PTR_ERR(jmp_table.prog_keys);
+		goto out;
+	}
+
+	ATTACH_AND_STORE_LINK(hid_tail_call);
+	ATTACH_AND_STORE_LINK(hid_prog_release);
+	ATTACH_AND_STORE_LINK(hid_free_inode);
+
+	return 0;
+out:
+	hid_bpf_free_links_and_skel();
+	return err;
+}
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 9c1d31f63f85..1098c49b5d2e 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2040,6 +2040,10 @@ int hid_input_report(struct hid_device *hid, enum hid_report_type type, u8 *data
 	report_enum = hid->report_enum + type;
 	hdrv = hid->driver;
 
+	ret = dispatch_hid_bpf_device_event(hid, type, data, size, interrupt);
+	if (ret)
+		goto unlock;
+
 	if (!size) {
 		dbg_hid("empty report\n");
 		ret = -1;
@@ -2790,6 +2794,8 @@ struct hid_device *hid_allocate_device(void)
 	sema_init(&hdev->driver_input_lock, 1);
 	mutex_init(&hdev->ll_open_lock);
 
+	hid_bpf_device_init(hdev);
+
 	return hdev;
 }
 EXPORT_SYMBOL_GPL(hid_allocate_device);
@@ -2816,6 +2822,7 @@ static void hid_remove_device(struct hid_device *hdev)
  */
 void hid_destroy_device(struct hid_device *hdev)
 {
+	hid_bpf_destroy_device(hdev);
 	hid_remove_device(hdev);
 	put_device(&hdev->dev);
 }
@@ -2902,6 +2909,13 @@ int hid_check_keys_pressed(struct hid_device *hid)
 }
 EXPORT_SYMBOL_GPL(hid_check_keys_pressed);
 
+#ifdef CONFIG_HID_BPF
+static struct hid_bpf_ops hid_ops = {
+	.owner = THIS_MODULE,
+	.bus_type = &hid_bus_type,
+};
+#endif
+
 static int __init hid_init(void)
 {
 	int ret;
@@ -2916,6 +2930,10 @@ static int __init hid_init(void)
 		goto err;
 	}
 
+#ifdef CONFIG_HID_BPF
+	hid_bpf_ops = &hid_ops;
+#endif
+
 	ret = hidraw_init();
 	if (ret)
 		goto err_bus;
@@ -2931,6 +2949,9 @@ static int __init hid_init(void)
 
 static void __exit hid_exit(void)
 {
+#ifdef CONFIG_HID_BPF
+	hid_bpf_ops = NULL;
+#endif
 	hid_debug_exit();
 	hidraw_exit();
 	bus_unregister(&hid_bus_type);
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 8677ae38599e..cd3c52fae7b1 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -26,6 +26,7 @@
 #include <linux/mutex.h>
 #include <linux/power_supply.h>
 #include <uapi/linux/hid.h>
+#include <linux/hid_bpf.h>
 
 /*
  * We parse each description item into this structure. Short items data
@@ -651,6 +652,10 @@ struct hid_device {							/* device report descriptor */
 	wait_queue_head_t debug_wait;
 
 	unsigned int id;						/* system unique id */
+
+#ifdef CONFIG_BPF
+	struct hid_bpf bpf;						/* hid-bpf data */
+#endif /* CONFIG_BPF */
 };
 
 #define to_hid_device(pdev) \
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
new file mode 100644
index 000000000000..de3fb1c376d2
--- /dev/null
+++ b/include/linux/hid_bpf.h
@@ -0,0 +1,117 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef __HID_BPF_H
+#define __HID_BPF_H
+
+#include <linux/spinlock.h>
+#include <uapi/linux/hid.h>
+
+struct hid_device;
+
+/*
+ * The following is the user facing HID BPF API.
+ *
+ * Extra care should be taken when editing this part, as
+ * it might break existing out of the tree bpf programs.
+ */
+
+/**
+ * struct hid_bpf_ctx - User accessible data for all HID programs
+ *
+ * ``data`` is not directly accessible from the context. We need to issue
+ * a call to ``hid_bpf_get_data()`` in order to get a pointer to that field.
+ *
+ * All of these fields are currently read-only.
+ *
+ * @index: program index in the jump table. No special meaning (a smaller index
+ *         doesn't mean the program will be executed before another program with
+ *         a bigger index).
+ * @hid: the ``struct hid_device`` representing the device itself
+ * @report_type: used for ``hid_bpf_device_event()``
+ * @size: Valid data in the data field.
+ *
+ *        Programs can get the available valid size in data by fetching this field.
+ */
+struct hid_bpf_ctx {
+	__u32 index;
+	const struct hid_device *hid;
+	enum hid_report_type report_type;
+	__s32 size;
+};
+
+/**
+ * enum hid_bpf_attach_flags - flags used when attaching a HIF-BPF program
+ *
+ * @HID_BPF_FLAG_NONE: no specific flag is used, the kernel choses where to
+ *                     insert the program
+ * @HID_BPF_FLAG_INSERT_HEAD: insert the given program before any other program
+ *                            currently attached to the device. This doesn't
+ *                            guarantee that this program will always be first
+ * @HID_BPF_FLAG_MAX: sentinel value, not to be used by the callers
+ */
+enum hid_bpf_attach_flags {
+	HID_BPF_FLAG_NONE = 0,
+	HID_BPF_FLAG_INSERT_HEAD = _BITUL(0),
+	HID_BPF_FLAG_MAX,
+};
+
+/* Following functions are tracepoints that BPF programs can attach to */
+int hid_bpf_device_event(struct hid_bpf_ctx *ctx);
+
+/* Following functions are kfunc that we export to BPF programs */
+/* only available in tracing */
+__u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t __sz);
+
+/* only available in syscall */
+int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags);
+
+/*
+ * Below is HID internal
+ */
+
+/* internal function to call eBPF programs, not to be used by anybody */
+int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx);
+
+#define HID_BPF_MAX_PROGS_PER_DEV 64
+#define HID_BPF_FLAG_MASK (((HID_BPF_FLAG_MAX - 1) << 1) - 1)
+
+/* types of HID programs to attach to */
+enum hid_bpf_prog_type {
+	HID_BPF_PROG_TYPE_UNDEF = -1,
+	HID_BPF_PROG_TYPE_DEVICE_EVENT,			/* an event is emitted from the device */
+	HID_BPF_PROG_TYPE_MAX,
+};
+
+struct hid_bpf_ops {
+	struct module *owner;
+	struct bus_type *bus_type;
+};
+
+extern struct hid_bpf_ops *hid_bpf_ops;
+
+struct hid_bpf_prog_list {
+	u16 prog_idx[HID_BPF_MAX_PROGS_PER_DEV];
+	u8 prog_cnt;
+};
+
+/* stored in each device */
+struct hid_bpf {
+	struct hid_bpf_prog_list __rcu *progs[HID_BPF_PROG_TYPE_MAX];	/* attached BPF progs */
+	bool destroyed;			/* prevents the assignment of any progs */
+
+	spinlock_t progs_lock;		/* protects RCU update of progs */
+};
+
+#ifdef CONFIG_HID_BPF
+int dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data,
+				  u32 size, int interrupt);
+void hid_bpf_destroy_device(struct hid_device *hid);
+void hid_bpf_device_init(struct hid_device *hid);
+#else /* CONFIG_HID_BPF */
+static inline int dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type,
+						u8 *data, u32 size, int interrupt) { return 0; }
+static inline void hid_bpf_destroy_device(struct hid_device *hid) {}
+static inline void hid_bpf_device_init(struct hid_device *hid) {}
+#endif /* CONFIG_HID_BPF */
+
+#endif /* __HID_BPF_H */

From dbb60c8a26daf388f183f599e1e96de5bb9f96e1 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:45 +0100
Subject: [PATCH 03/33] selftests: add tests for the HID-bpf initial
 implementation

The tests are pretty basic:
- create a virtual uhid device that no userspace will like (to not mess
  up the running system)
- attach a BPF prog to it
- open the matching hidraw node
- inject one event and check:
  * that the BPF program can do something on the event stream
  * can modify the event stream
- add another test where we attach/detach BPF programs to see if we get
  errors

Note: the Makefile is extracted from selftests/bpf so we can rebuild
the libbpf and bpftool components from the current kernel tree without
relying on system installed components.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 MAINTAINERS                                   |   1 +
 tools/testing/selftests/Makefile              |   1 +
 tools/testing/selftests/hid/.gitignore        |   4 +
 tools/testing/selftests/hid/Makefile          | 233 ++++++
 tools/testing/selftests/hid/config            |  20 +
 tools/testing/selftests/hid/hid_bpf.c         | 675 ++++++++++++++++++
 tools/testing/selftests/hid/progs/hid.c       |  41 ++
 .../selftests/hid/progs/hid_bpf_helpers.h     |  14 +
 8 files changed, 989 insertions(+)
 create mode 100644 tools/testing/selftests/hid/.gitignore
 create mode 100644 tools/testing/selftests/hid/Makefile
 create mode 100644 tools/testing/selftests/hid/config
 create mode 100644 tools/testing/selftests/hid/hid_bpf.c
 create mode 100644 tools/testing/selftests/hid/progs/hid.c
 create mode 100644 tools/testing/selftests/hid/progs/hid_bpf_helpers.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 1b391ca7cf91..81eb9abbc17a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9100,6 +9100,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git
 F:	drivers/hid/
 F:	include/linux/hid*
 F:	include/uapi/linux/hid*
+F:	tools/testing/selftests/hid/
 
 HID LOGITECH DRIVERS
 R:	Filipe Laíns <lains@riseup.net>
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index f07aef7c592c..479127efddf9 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -26,6 +26,7 @@ TARGETS += fpu
 TARGETS += ftrace
 TARGETS += futex
 TARGETS += gpio
+TARGETS += hid
 TARGETS += intel_pstate
 TARGETS += ipc
 TARGETS += ir
diff --git a/tools/testing/selftests/hid/.gitignore b/tools/testing/selftests/hid/.gitignore
new file mode 100644
index 000000000000..a462ca6ab2c0
--- /dev/null
+++ b/tools/testing/selftests/hid/.gitignore
@@ -0,0 +1,4 @@
+bpftool
+*.skel.h
+/tools
+hid_bpf
diff --git a/tools/testing/selftests/hid/Makefile b/tools/testing/selftests/hid/Makefile
new file mode 100644
index 000000000000..693f1cb6e47a
--- /dev/null
+++ b/tools/testing/selftests/hid/Makefile
@@ -0,0 +1,233 @@
+# SPDX-License-Identifier: GPL-2.0
+
+# based on tools/testing/selftest/bpf/Makefile
+include ../../../build/Build.include
+include ../../../scripts/Makefile.arch
+include ../../../scripts/Makefile.include
+
+CXX ?= $(CROSS_COMPILE)g++
+
+CURDIR := $(abspath .)
+TOOLSDIR := $(abspath ../../..)
+TOP_SRCDIR = $(CURDIR)/../../../..
+KHDR_INCLUDES := $(TOP_SRCDIR)/usr/include
+LIBDIR := $(TOOLSDIR)/lib
+BPFDIR := $(LIBDIR)/bpf
+TOOLSINCDIR := $(TOOLSDIR)/include
+BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
+HOSTPKG_CONFIG := pkg-config
+
+CFLAGS += -g -O0 -rdynamic -Wall -Werror -I$(KHDR_INCLUDES)
+LDLIBS += -lelf -lz -lrt -lpthread
+
+# Silence some warnings when compiled with clang
+ifneq ($(LLVM),)
+CFLAGS += -Wno-unused-command-line-argument
+endif
+
+# Order correspond to 'make run_tests' order
+TEST_GEN_PROGS = hid_bpf
+
+# Emit succinct information message describing current building step
+# $1 - generic step name (e.g., CC, LINK, etc);
+# $2 - optional "flavor" specifier; if provided, will be emitted as [flavor];
+# $3 - target (assumed to be file); only file name will be emitted;
+# $4 - optional extra arg, emitted as-is, if provided.
+ifeq ($(V),1)
+Q =
+msg =
+else
+Q = @
+msg = @printf '  %-8s%s %s%s\n' "$(1)" "$(if $(2), [$(2)])" "$(notdir $(3))" "$(if $(4), $(4))";
+MAKEFLAGS += --no-print-directory
+submake_extras := feature_display=0
+endif
+
+# override lib.mk's default rules
+OVERRIDE_TARGETS := 1
+override define CLEAN
+	$(call msg,CLEAN)
+	$(Q)$(RM) -r $(TEST_GEN_PROGS)
+	$(Q)$(RM) -r $(EXTRA_CLEAN)
+endef
+
+include ../lib.mk
+
+SCRATCH_DIR := $(OUTPUT)/tools
+BUILD_DIR := $(SCRATCH_DIR)/build
+INCLUDE_DIR := $(SCRATCH_DIR)/include
+BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
+ifneq ($(CROSS_COMPILE),)
+HOST_BUILD_DIR		:= $(BUILD_DIR)/host
+HOST_SCRATCH_DIR	:= $(OUTPUT)/host-tools
+HOST_INCLUDE_DIR	:= $(HOST_SCRATCH_DIR)/include
+else
+HOST_BUILD_DIR		:= $(BUILD_DIR)
+HOST_SCRATCH_DIR	:= $(SCRATCH_DIR)
+HOST_INCLUDE_DIR	:= $(INCLUDE_DIR)
+endif
+HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a
+RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids
+
+VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)				\
+		     $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)	\
+		     ../../../../vmlinux				\
+		     /sys/kernel/btf/vmlinux				\
+		     /boot/vmlinux-$(shell uname -r)
+VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
+ifeq ($(VMLINUX_BTF),)
+$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
+endif
+
+# Define simple and short `make test_progs`, `make test_sysctl`, etc targets
+# to build individual tests.
+# NOTE: Semicolon at the end is critical to override lib.mk's default static
+# rule for binaries.
+$(notdir $(TEST_GEN_PROGS)): %: $(OUTPUT)/% ;
+
+# sort removes libbpf duplicates when not cross-building
+MAKE_DIRS := $(sort $(BUILD_DIR)/libbpf $(HOST_BUILD_DIR)/libbpf		\
+	       $(HOST_BUILD_DIR)/bpftool $(HOST_BUILD_DIR)/resolve_btfids	\
+	       $(INCLUDE_DIR))
+$(MAKE_DIRS):
+	$(call msg,MKDIR,,$@)
+	$(Q)mkdir -p $@
+
+$(OUTPUT)/%.o: %.c
+	$(call msg,CC,,$@)
+	$(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
+
+# LLVM's ld.lld doesn't support all the architectures, so use it only on x86
+ifeq ($(SRCARCH),x86)
+LLD := lld
+else
+LLD := ld
+endif
+
+DEFAULT_BPFTOOL := $(HOST_SCRATCH_DIR)/sbin/bpftool
+
+TEST_GEN_PROGS_EXTENDED += $(DEFAULT_BPFTOOL)
+
+$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(BPFOBJ)
+
+BPFTOOL ?= $(DEFAULT_BPFTOOL)
+$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile)    \
+		    $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool
+	$(Q)$(MAKE) $(submake_extras)  -C $(BPFTOOLDIR)			       \
+		    ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) 	       \
+		    EXTRA_CFLAGS='-g -O0'				       \
+		    OUTPUT=$(HOST_BUILD_DIR)/bpftool/			       \
+		    LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/		       \
+		    LIBBPF_DESTDIR=$(HOST_SCRATCH_DIR)/			       \
+		    prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install-bin
+
+$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
+	   $(KHDR_INCLUDES)/linux/bpf.h					       \
+	   | $(BUILD_DIR)/libbpf
+	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
+		    EXTRA_CFLAGS='-g -O0'				       \
+		    DESTDIR=$(SCRATCH_DIR) prefix= all install_headers
+
+ifneq ($(BPFOBJ),$(HOST_BPFOBJ))
+$(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
+		$(KHDR_INCLUDES)/linux/bpf.h					       \
+		| $(HOST_BUILD_DIR)/libbpf
+	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR)                             \
+		    EXTRA_CFLAGS='-g -O0' ARCH= CROSS_COMPILE=		       \
+		    OUTPUT=$(HOST_BUILD_DIR)/libbpf/ CC=$(HOSTCC) LD=$(HOSTLD) \
+		    DESTDIR=$(HOST_SCRATCH_DIR)/ prefix= all install_headers
+endif
+
+$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
+ifeq ($(VMLINUX_H),)
+	$(call msg,GEN,,$@)
+	$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
+else
+	$(call msg,CP,,$@)
+	$(Q)cp "$(VMLINUX_H)" $@
+endif
+
+$(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids	\
+		       $(TOOLSDIR)/bpf/resolve_btfids/main.c	\
+		       $(TOOLSDIR)/lib/rbtree.c			\
+		       $(TOOLSDIR)/lib/zalloc.c			\
+		       $(TOOLSDIR)/lib/string.c			\
+		       $(TOOLSDIR)/lib/ctype.c			\
+		       $(TOOLSDIR)/lib/str_error_r.c
+	$(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/resolve_btfids	\
+		CC=$(HOSTCC) LD=$(HOSTLD) AR=$(HOSTAR) \
+		LIBBPF_INCLUDE=$(HOST_INCLUDE_DIR) \
+		OUTPUT=$(HOST_BUILD_DIR)/resolve_btfids/ BPFOBJ=$(HOST_BPFOBJ)
+
+# Get Clang's default includes on this system, as opposed to those seen by
+# '-target bpf'. This fixes "missing" files on some architectures/distros,
+# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
+#
+# Use '-idirafter': Don't interfere with include mechanics except where the
+# build would have failed anyways.
+define get_sys_includes
+$(shell $(1) -v -E - </dev/null 2>&1 \
+	| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
+$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
+endef
+
+# Determine target endianness.
+IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \
+			grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__')
+MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
+
+CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
+BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) 		\
+	     -I$(INCLUDE_DIR) -I$(CURDIR) -I$(KHDR_INCLUDES)		\
+	     -I$(abspath $(OUTPUT)/../usr/include)
+
+CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
+	       -Wno-compare-distinct-pointer-types
+
+# Build BPF object using Clang
+# $1 - input .c file
+# $2 - output .o file
+# $3 - CFLAGS
+define CLANG_BPF_BUILD_RULE
+	$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
+	$(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v3 -o $2
+endef
+# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
+define CLANG_NOALU32_BPF_BUILD_RULE
+	$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
+	$(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v2 -o $2
+endef
+# Build BPF object using GCC
+define GCC_BPF_BUILD_RULE
+	$(call msg,GCC-BPF,$(TRUNNER_BINARY),$2)
+	$(Q)$(BPF_GCC) $3 -O2 -c $1 -o $2
+endef
+
+BPF_PROGS_DIR := progs
+BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
+BPF_SRCS := $(notdir $(wildcard $(BPF_PROGS_DIR)/*.c))
+BPF_OBJS := $(patsubst %.c,$(OUTPUT)/%.bpf.o, $(BPF_SRCS))
+BPF_SKELS := $(patsubst %.c,$(OUTPUT)/%.skel.h, $(BPF_SRCS))
+TEST_GEN_FILES += $(BPF_OBJS)
+
+$(BPF_PROGS_DIR)-bpfobjs := y
+$(BPF_OBJS): $(OUTPUT)/%.bpf.o:				\
+	     $(BPF_PROGS_DIR)/%.c			\
+	     $(wildcard $(BPF_PROGS_DIR)/*.h)		\
+	     $(INCLUDE_DIR)/vmlinux.h				\
+	     $(wildcard $(BPFDIR)/hid_bpf_*.h)			\
+	     $(wildcard $(BPFDIR)/*.bpf.h)			\
+	     | $(OUTPUT) $(BPFOBJ)
+	$(call $(BPF_BUILD_RULE),$<,$@, $(BPF_CFLAGS))
+
+$(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT)
+	$(call msg,GEN-SKEL,$(BINARY),$@)
+	$(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
+	$(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@
+
+$(OUTPUT)/%:%.c $(BPF_SKELS)
+	$(call msg,BINARY,,$@)
+	$(Q)$(LINK.c) $^ $(LDLIBS) -o $@
+
+EXTRA_CLEAN := $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) feature bpftool	\
+	$(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32)
diff --git a/tools/testing/selftests/hid/config b/tools/testing/selftests/hid/config
new file mode 100644
index 000000000000..d4130489c1b1
--- /dev/null
+++ b/tools/testing/selftests/hid/config
@@ -0,0 +1,20 @@
+CONFIG_BPF_EVENTS=y
+CONFIG_BPFILTER=y
+CONFIG_BPF_JIT_ALWAYS_ON=y
+CONFIG_BPF_JIT=y
+CONFIG_BPF_KPROBE_OVERRIDE=y
+CONFIG_BPF_LSM=y
+CONFIG_BPF_PRELOAD_UMD=y
+CONFIG_BPF_PRELOAD=y
+CONFIG_BPF_STREAM_PARSER=y
+CONFIG_BPF_SYSCALL=y
+CONFIG_BPF=y
+CONFIG_CGROUP_BPF=y
+CONFIG_DEBUG_INFO_BTF=y
+CONFIG_FPROBE=y
+CONFIG_FTRACE_SYSCALLS=y
+CONFIG_FUNCTION_TRACER=y
+CONFIG_HIDRAW=y
+CONFIG_HID=y
+CONFIG_INPUT_EVDEV=y
+CONFIG_UHID=y
diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
new file mode 100644
index 000000000000..4fc7794c6f8b
--- /dev/null
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -0,0 +1,675 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Red Hat */
+#include "hid.skel.h"
+
+#include "../kselftest_harness.h"
+
+#include <bpf/bpf.h>
+#include <fcntl.h>
+#include <fnmatch.h>
+#include <dirent.h>
+#include <poll.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <linux/hidraw.h>
+#include <linux/uhid.h>
+
+#define SHOW_UHID_DEBUG 0
+
+static unsigned char rdesc[] = {
+	0x06, 0x00, 0xff,	/* Usage Page (Vendor Defined Page 1) */
+	0x09, 0x21,		/* Usage (Vendor Usage 0x21) */
+	0xa1, 0x01,		/* COLLECTION (Application) */
+	0x09, 0x01,			/* Usage (Vendor Usage 0x01) */
+	0xa1, 0x00,			/* COLLECTION (Physical) */
+	0x85, 0x01,				/* REPORT_ID (1) */
+	0x06, 0x00, 0xff,			/* Usage Page (Vendor Defined Page 1) */
+	0x19, 0x01,				/* USAGE_MINIMUM (1) */
+	0x29, 0x03,				/* USAGE_MAXIMUM (3) */
+	0x15, 0x00,				/* LOGICAL_MINIMUM (0) */
+	0x25, 0x01,				/* LOGICAL_MAXIMUM (1) */
+	0x95, 0x03,				/* REPORT_COUNT (3) */
+	0x75, 0x01,				/* REPORT_SIZE (1) */
+	0x81, 0x02,				/* INPUT (Data,Var,Abs) */
+	0x95, 0x01,				/* REPORT_COUNT (1) */
+	0x75, 0x05,				/* REPORT_SIZE (5) */
+	0x81, 0x01,				/* INPUT (Cnst,Var,Abs) */
+	0x05, 0x01,				/* USAGE_PAGE (Generic Desktop) */
+	0x09, 0x30,				/* USAGE (X) */
+	0x09, 0x31,				/* USAGE (Y) */
+	0x15, 0x81,				/* LOGICAL_MINIMUM (-127) */
+	0x25, 0x7f,				/* LOGICAL_MAXIMUM (127) */
+	0x75, 0x10,				/* REPORT_SIZE (16) */
+	0x95, 0x02,				/* REPORT_COUNT (2) */
+	0x81, 0x06,				/* INPUT (Data,Var,Rel) */
+
+	0x06, 0x00, 0xff,			/* Usage Page (Vendor Defined Page 1) */
+	0x19, 0x01,				/* USAGE_MINIMUM (1) */
+	0x29, 0x03,				/* USAGE_MAXIMUM (3) */
+	0x15, 0x00,				/* LOGICAL_MINIMUM (0) */
+	0x25, 0x01,				/* LOGICAL_MAXIMUM (1) */
+	0x95, 0x03,				/* REPORT_COUNT (3) */
+	0x75, 0x01,				/* REPORT_SIZE (1) */
+	0x91, 0x02,				/* Output (Data,Var,Abs) */
+	0x95, 0x01,				/* REPORT_COUNT (1) */
+	0x75, 0x05,				/* REPORT_SIZE (5) */
+	0x91, 0x01,				/* Output (Cnst,Var,Abs) */
+
+	0x06, 0x00, 0xff,			/* Usage Page (Vendor Defined Page 1) */
+	0x19, 0x06,				/* USAGE_MINIMUM (6) */
+	0x29, 0x08,				/* USAGE_MAXIMUM (8) */
+	0x15, 0x00,				/* LOGICAL_MINIMUM (0) */
+	0x25, 0x01,				/* LOGICAL_MAXIMUM (1) */
+	0x95, 0x03,				/* REPORT_COUNT (3) */
+	0x75, 0x01,				/* REPORT_SIZE (1) */
+	0xb1, 0x02,				/* Feature (Data,Var,Abs) */
+	0x95, 0x01,				/* REPORT_COUNT (1) */
+	0x75, 0x05,				/* REPORT_SIZE (5) */
+	0x91, 0x01,				/* Output (Cnst,Var,Abs) */
+
+	0xc0,				/* END_COLLECTION */
+	0xc0,			/* END_COLLECTION */
+};
+
+struct attach_prog_args {
+	int prog_fd;
+	unsigned int hid;
+	int retval;
+};
+
+#define ASSERT_OK(data) ASSERT_FALSE(data)
+#define ASSERT_OK_PTR(ptr) ASSERT_NE(NULL, ptr)
+
+#define UHID_LOG(fmt, ...) do { \
+	if (SHOW_UHID_DEBUG) \
+		TH_LOG(fmt, ##__VA_ARGS__); \
+} while (0)
+
+static pthread_mutex_t uhid_started_mtx = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t uhid_started = PTHREAD_COND_INITIALIZER;
+
+/* no need to protect uhid_stopped, only one thread accesses it */
+static bool uhid_stopped;
+
+static int uhid_write(struct __test_metadata *_metadata, int fd, const struct uhid_event *ev)
+{
+	ssize_t ret;
+
+	ret = write(fd, ev, sizeof(*ev));
+	if (ret < 0) {
+		TH_LOG("Cannot write to uhid: %m");
+		return -errno;
+	} else if (ret != sizeof(*ev)) {
+		TH_LOG("Wrong size written to uhid: %zd != %zu",
+			ret, sizeof(ev));
+		return -EFAULT;
+	} else {
+		return 0;
+	}
+}
+
+static int uhid_create(struct __test_metadata *_metadata, int fd, int rand_nb)
+{
+	struct uhid_event ev;
+	char buf[25];
+
+	sprintf(buf, "test-uhid-device-%d", rand_nb);
+
+	memset(&ev, 0, sizeof(ev));
+	ev.type = UHID_CREATE;
+	strcpy((char *)ev.u.create.name, buf);
+	ev.u.create.rd_data = rdesc;
+	ev.u.create.rd_size = sizeof(rdesc);
+	ev.u.create.bus = BUS_USB;
+	ev.u.create.vendor = 0x0001;
+	ev.u.create.product = 0x0a37;
+	ev.u.create.version = 0;
+	ev.u.create.country = 0;
+
+	sprintf(buf, "%d", rand_nb);
+	strcpy((char *)ev.u.create.phys, buf);
+
+	return uhid_write(_metadata, fd, &ev);
+}
+
+static void uhid_destroy(struct __test_metadata *_metadata, int fd)
+{
+	struct uhid_event ev;
+
+	memset(&ev, 0, sizeof(ev));
+	ev.type = UHID_DESTROY;
+
+	uhid_write(_metadata, fd, &ev);
+}
+
+static int uhid_event(struct __test_metadata *_metadata, int fd)
+{
+	struct uhid_event ev;
+	ssize_t ret;
+
+	memset(&ev, 0, sizeof(ev));
+	ret = read(fd, &ev, sizeof(ev));
+	if (ret == 0) {
+		UHID_LOG("Read HUP on uhid-cdev");
+		return -EFAULT;
+	} else if (ret < 0) {
+		UHID_LOG("Cannot read uhid-cdev: %m");
+		return -errno;
+	} else if (ret != sizeof(ev)) {
+		UHID_LOG("Invalid size read from uhid-dev: %zd != %zu",
+			ret, sizeof(ev));
+		return -EFAULT;
+	}
+
+	switch (ev.type) {
+	case UHID_START:
+		pthread_mutex_lock(&uhid_started_mtx);
+		pthread_cond_signal(&uhid_started);
+		pthread_mutex_unlock(&uhid_started_mtx);
+
+		UHID_LOG("UHID_START from uhid-dev");
+		break;
+	case UHID_STOP:
+		uhid_stopped = true;
+
+		UHID_LOG("UHID_STOP from uhid-dev");
+		break;
+	case UHID_OPEN:
+		UHID_LOG("UHID_OPEN from uhid-dev");
+		break;
+	case UHID_CLOSE:
+		UHID_LOG("UHID_CLOSE from uhid-dev");
+		break;
+	case UHID_OUTPUT:
+		UHID_LOG("UHID_OUTPUT from uhid-dev");
+		break;
+	case UHID_GET_REPORT:
+		UHID_LOG("UHID_GET_REPORT from uhid-dev");
+		break;
+	case UHID_SET_REPORT:
+		UHID_LOG("UHID_SET_REPORT from uhid-dev");
+		break;
+	default:
+		TH_LOG("Invalid event from uhid-dev: %u", ev.type);
+	}
+
+	return 0;
+}
+
+struct uhid_thread_args {
+	int fd;
+	struct __test_metadata *_metadata;
+};
+static void *uhid_read_events_thread(void *arg)
+{
+	struct uhid_thread_args *args = (struct uhid_thread_args *)arg;
+	struct __test_metadata *_metadata = args->_metadata;
+	struct pollfd pfds[1];
+	int fd = args->fd;
+	int ret = 0;
+
+	pfds[0].fd = fd;
+	pfds[0].events = POLLIN;
+
+	uhid_stopped = false;
+
+	while (!uhid_stopped) {
+		ret = poll(pfds, 1, 100);
+		if (ret < 0) {
+			TH_LOG("Cannot poll for fds: %m");
+			break;
+		}
+		if (pfds[0].revents & POLLIN) {
+			ret = uhid_event(_metadata, fd);
+			if (ret)
+				break;
+		}
+	}
+
+	return (void *)(long)ret;
+}
+
+static int uhid_start_listener(struct __test_metadata *_metadata, pthread_t *tid, int uhid_fd)
+{
+	struct uhid_thread_args args = {
+		.fd = uhid_fd,
+		._metadata = _metadata,
+	};
+	int err;
+
+	pthread_mutex_lock(&uhid_started_mtx);
+	err = pthread_create(tid, NULL, uhid_read_events_thread, (void *)&args);
+	ASSERT_EQ(0, err) {
+		TH_LOG("Could not start the uhid thread: %d", err);
+		pthread_mutex_unlock(&uhid_started_mtx);
+		close(uhid_fd);
+		return -EIO;
+	}
+	pthread_cond_wait(&uhid_started, &uhid_started_mtx);
+	pthread_mutex_unlock(&uhid_started_mtx);
+
+	return 0;
+}
+
+static int uhid_send_event(struct __test_metadata *_metadata, int fd, __u8 *buf, size_t size)
+{
+	struct uhid_event ev;
+
+	if (size > sizeof(ev.u.input.data))
+		return -E2BIG;
+
+	memset(&ev, 0, sizeof(ev));
+	ev.type = UHID_INPUT2;
+	ev.u.input2.size = size;
+
+	memcpy(ev.u.input2.data, buf, size);
+
+	return uhid_write(_metadata, fd, &ev);
+}
+
+static int setup_uhid(struct __test_metadata *_metadata, int rand_nb)
+{
+	int fd;
+	const char *path = "/dev/uhid";
+	int ret;
+
+	fd = open(path, O_RDWR | O_CLOEXEC);
+	ASSERT_GE(fd, 0) TH_LOG("open uhid-cdev failed; %d", fd);
+
+	ret = uhid_create(_metadata, fd, rand_nb);
+	ASSERT_EQ(0, ret) {
+		TH_LOG("create uhid device failed: %d", ret);
+		close(fd);
+	}
+
+	return fd;
+}
+
+static bool match_sysfs_device(int dev_id, const char *workdir, struct dirent *dir)
+{
+	const char *target = "0003:0001:0A37.*";
+	char phys[512];
+	char uevent[1024];
+	char temp[512];
+	int fd, nread;
+	bool found = false;
+
+	if (fnmatch(target, dir->d_name, 0))
+		return false;
+
+	/* we found the correct VID/PID, now check for phys */
+	sprintf(uevent, "%s/%s/uevent", workdir, dir->d_name);
+
+	fd = open(uevent, O_RDONLY | O_NONBLOCK);
+	if (fd < 0)
+		return false;
+
+	sprintf(phys, "PHYS=%d", dev_id);
+
+	nread = read(fd, temp, ARRAY_SIZE(temp));
+	if (nread > 0 && (strstr(temp, phys)) != NULL)
+		found = true;
+
+	close(fd);
+
+	return found;
+}
+
+static int get_hid_id(int dev_id)
+{
+	const char *workdir = "/sys/devices/virtual/misc/uhid";
+	const char *str_id;
+	DIR *d;
+	struct dirent *dir;
+	int found = -1, attempts = 3;
+
+	/* it would be nice to be able to use nftw, but the no_alu32 target doesn't support it */
+
+	while (found < 0 && attempts > 0) {
+		attempts--;
+		d = opendir(workdir);
+		if (d) {
+			while ((dir = readdir(d)) != NULL) {
+				if (!match_sysfs_device(dev_id, workdir, dir))
+					continue;
+
+				str_id = dir->d_name + sizeof("0003:0001:0A37.");
+				found = (int)strtol(str_id, NULL, 16);
+
+				break;
+			}
+			closedir(d);
+		}
+		if (found < 0)
+			usleep(100000);
+	}
+
+	return found;
+}
+
+static int get_hidraw(int dev_id)
+{
+	const char *workdir = "/sys/devices/virtual/misc/uhid";
+	char sysfs[1024];
+	DIR *d, *subd;
+	struct dirent *dir, *subdir;
+	int i, found = -1;
+
+	/* retry 5 times in case the system is loaded */
+	for (i = 5; i > 0; i--) {
+		usleep(10);
+		d = opendir(workdir);
+
+		if (!d)
+			continue;
+
+		while ((dir = readdir(d)) != NULL) {
+			if (!match_sysfs_device(dev_id, workdir, dir))
+				continue;
+
+			sprintf(sysfs, "%s/%s/hidraw", workdir, dir->d_name);
+
+			subd = opendir(sysfs);
+			if (!subd)
+				continue;
+
+			while ((subdir = readdir(subd)) != NULL) {
+				if (fnmatch("hidraw*", subdir->d_name, 0))
+					continue;
+
+				found = atoi(subdir->d_name + strlen("hidraw"));
+			}
+
+			closedir(subd);
+
+			if (found > 0)
+				break;
+		}
+		closedir(d);
+	}
+
+	return found;
+}
+
+static int open_hidraw(int dev_id)
+{
+	int hidraw_number;
+	char hidraw_path[64] = { 0 };
+
+	hidraw_number = get_hidraw(dev_id);
+	if (hidraw_number < 0)
+		return hidraw_number;
+
+	/* open hidraw node to check the other side of the pipe */
+	sprintf(hidraw_path, "/dev/hidraw%d", hidraw_number);
+	return open(hidraw_path, O_RDWR | O_NONBLOCK);
+}
+
+FIXTURE(hid_bpf) {
+	int dev_id;
+	int uhid_fd;
+	int hidraw_fd;
+	int hid_id;
+	pthread_t tid;
+	struct hid *skel;
+};
+static void detach_bpf(FIXTURE_DATA(hid_bpf) * self)
+{
+	if (self->hidraw_fd)
+		close(self->hidraw_fd);
+	self->hidraw_fd = 0;
+
+	hid__destroy(self->skel);
+	self->skel = NULL;
+}
+
+FIXTURE_TEARDOWN(hid_bpf) {
+	void *uhid_err;
+
+	uhid_destroy(_metadata, self->uhid_fd);
+
+	detach_bpf(self);
+	pthread_join(self->tid, &uhid_err);
+}
+#define TEARDOWN_LOG(fmt, ...) do { \
+	TH_LOG(fmt, ##__VA_ARGS__); \
+	hid_bpf_teardown(_metadata, self, variant); \
+} while (0)
+
+FIXTURE_SETUP(hid_bpf)
+{
+	time_t t;
+	int err;
+
+	/* initialize random number generator */
+	srand((unsigned int)time(&t));
+
+	self->dev_id = rand() % 1024;
+
+	self->uhid_fd = setup_uhid(_metadata, self->dev_id);
+
+	/* locate the uev, self, variant);ent file of the created device */
+	self->hid_id = get_hid_id(self->dev_id);
+	ASSERT_GT(self->hid_id, 0)
+		TEARDOWN_LOG("Could not locate uhid device id: %d", self->hid_id);
+
+	err = uhid_start_listener(_metadata, &self->tid, self->uhid_fd);
+	ASSERT_EQ(0, err) TEARDOWN_LOG("could not start udev listener: %d", err);
+}
+
+struct test_program {
+	const char *name;
+};
+#define LOAD_PROGRAMS(progs) \
+	load_programs(progs, ARRAY_SIZE(progs), _metadata, self, variant)
+#define LOAD_BPF \
+	load_programs(NULL, 0, _metadata, self, variant)
+static void load_programs(const struct test_program programs[],
+			  const size_t progs_count,
+			  struct __test_metadata *_metadata,
+			  FIXTURE_DATA(hid_bpf) * self,
+			  const FIXTURE_VARIANT(hid_bpf) * variant)
+{
+	int attach_fd, err = -EINVAL;
+	struct attach_prog_args args = {
+		.retval = -1,
+	};
+	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
+			    .ctx_in = &args,
+			    .ctx_size_in = sizeof(args),
+	);
+
+	/* open the bpf file */
+	self->skel = hid__open();
+	ASSERT_OK_PTR(self->skel) TEARDOWN_LOG("Error while calling hid__open");
+
+	for (int i = 0; i < progs_count; i++) {
+		struct bpf_program *prog;
+
+		prog = bpf_object__find_program_by_name(*self->skel->skeleton->obj,
+							programs[i].name);
+		ASSERT_OK_PTR(prog) TH_LOG("can not find program by name '%s'", programs[i].name);
+
+		bpf_program__set_autoload(prog, true);
+	}
+
+	err = hid__load(self->skel);
+	ASSERT_OK(err) TH_LOG("hid_skel_load failed: %d", err);
+
+	attach_fd = bpf_program__fd(self->skel->progs.attach_prog);
+	ASSERT_GE(attach_fd, 0) TH_LOG("locate attach_prog: %d", attach_fd);
+
+	for (int i = 0; i < progs_count; i++) {
+		struct bpf_program *prog;
+
+		prog = bpf_object__find_program_by_name(*self->skel->skeleton->obj,
+							programs[i].name);
+		ASSERT_OK_PTR(prog) TH_LOG("can not find program by name '%s'", programs[i].name);
+
+		args.prog_fd = bpf_program__fd(prog);
+		args.hid = self->hid_id;
+		err = bpf_prog_test_run_opts(attach_fd, &tattr);
+		ASSERT_OK(args.retval) TH_LOG("attach_hid(%s): %d", programs[i].name, args.retval);
+	}
+
+	self->hidraw_fd = open_hidraw(self->dev_id);
+	ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
+}
+
+/*
+ * A simple test to see if the fixture is working fine.
+ * If this fails, none of the other tests will pass.
+ */
+TEST_F(hid_bpf, test_create_uhid)
+{
+}
+
+/*
+ * Attach hid_first_event to the given uhid device,
+ * retrieve and open the matching hidraw node,
+ * inject one event in the uhid device,
+ * check that the program sees it and can change the data
+ */
+TEST_F(hid_bpf, raw_event)
+{
+	const struct test_program progs[] = {
+		{ .name = "hid_first_event" },
+	};
+	__u8 buf[10] = {0};
+	int err;
+
+	LOAD_PROGRAMS(progs);
+
+	/* check that the program is correctly loaded */
+	ASSERT_EQ(self->skel->data->callback_check, 52) TH_LOG("callback_check1");
+	ASSERT_EQ(self->skel->data->callback2_check, 52) TH_LOG("callback2_check1");
+
+	/* inject one event */
+	buf[0] = 1;
+	buf[1] = 42;
+	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+
+	/* check that hid_first_event() was executed */
+	ASSERT_EQ(self->skel->data->callback_check, 42) TH_LOG("callback_check1");
+
+	/* read the data from hidraw */
+	memset(buf, 0, sizeof(buf));
+	err = read(self->hidraw_fd, buf, sizeof(buf));
+	ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
+	ASSERT_EQ(buf[0], 1);
+	ASSERT_EQ(buf[2], 47);
+
+	/* inject another event */
+	memset(buf, 0, sizeof(buf));
+	buf[0] = 1;
+	buf[1] = 47;
+	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+
+	/* check that hid_first_event() was executed */
+	ASSERT_EQ(self->skel->data->callback_check, 47) TH_LOG("callback_check1");
+
+	/* read the data from hidraw */
+	memset(buf, 0, sizeof(buf));
+	err = read(self->hidraw_fd, buf, sizeof(buf));
+	ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
+	ASSERT_EQ(buf[2], 52);
+}
+
+/*
+ * Ensures that we can attach/detach programs
+ */
+TEST_F(hid_bpf, test_attach_detach)
+{
+	const struct test_program progs[] = {
+		{ .name = "hid_first_event" },
+	};
+	__u8 buf[10] = {0};
+	int err;
+
+	LOAD_PROGRAMS(progs);
+
+	/* inject one event */
+	buf[0] = 1;
+	buf[1] = 42;
+	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+
+	/* read the data from hidraw */
+	memset(buf, 0, sizeof(buf));
+	err = read(self->hidraw_fd, buf, sizeof(buf));
+	ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
+	ASSERT_EQ(buf[0], 1);
+	ASSERT_EQ(buf[2], 47);
+
+	/* pin the program and immediately unpin it */
+#define PIN_PATH "/sys/fs/bpf/hid_first_event"
+	bpf_program__pin(self->skel->progs.hid_first_event, PIN_PATH);
+	remove(PIN_PATH);
+#undef PIN_PATH
+	usleep(100000);
+
+	/* detach the program */
+	detach_bpf(self);
+
+	self->hidraw_fd = open_hidraw(self->dev_id);
+	ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
+
+	/* inject another event */
+	memset(buf, 0, sizeof(buf));
+	buf[0] = 1;
+	buf[1] = 47;
+	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+
+	/* read the data from hidraw */
+	memset(buf, 0, sizeof(buf));
+	err = read(self->hidraw_fd, buf, sizeof(buf));
+	ASSERT_EQ(err, 6) TH_LOG("read_hidraw_no_bpf");
+	ASSERT_EQ(buf[0], 1);
+	ASSERT_EQ(buf[1], 47);
+	ASSERT_EQ(buf[2], 0);
+
+	/* re-attach our program */
+
+	LOAD_PROGRAMS(progs);
+
+	/* inject one event */
+	memset(buf, 0, sizeof(buf));
+	buf[0] = 1;
+	buf[1] = 42;
+	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+
+	/* read the data from hidraw */
+	memset(buf, 0, sizeof(buf));
+	err = read(self->hidraw_fd, buf, sizeof(buf));
+	ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
+	ASSERT_EQ(buf[0], 1);
+	ASSERT_EQ(buf[2], 47);
+}
+
+static int libbpf_print_fn(enum libbpf_print_level level,
+			   const char *format, va_list args)
+{
+	char buf[1024];
+
+	if (level == LIBBPF_DEBUG)
+		return 0;
+
+	snprintf(buf, sizeof(buf), "# %s", format);
+
+	vfprintf(stdout, buf, args);
+	return 0;
+}
+
+static void __attribute__((constructor)) __constructor_order_last(void)
+{
+	if (!__constructor_order)
+		__constructor_order = _CONSTRUCTOR_ORDER_BACKWARD;
+}
+
+int main(int argc, char **argv)
+{
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+	libbpf_set_print(libbpf_print_fn);
+
+	return test_harness_run(argc, argv);
+}
diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c
new file mode 100644
index 000000000000..b23ae2304346
--- /dev/null
+++ b/tools/testing/selftests/hid/progs/hid.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Red hat */
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include "hid_bpf_helpers.h"
+
+char _license[] SEC("license") = "GPL";
+
+struct attach_prog_args {
+	int prog_fd;
+	unsigned int hid;
+	int retval;
+};
+
+__u64 callback_check = 52;
+__u64 callback2_check = 52;
+
+SEC("?fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_first_event, struct hid_bpf_ctx *hid_ctx)
+{
+	__u8 *rw_data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 3 /* size */);
+
+	if (!rw_data)
+		return 0; /* EPERM check */
+
+	callback_check = rw_data[1];
+
+	rw_data[2] = rw_data[1] + 5;
+
+	return 0;
+}
+
+SEC("syscall")
+int attach_prog(struct attach_prog_args *ctx)
+{
+	ctx->retval = hid_bpf_attach_prog(ctx->hid,
+					  ctx->prog_fd,
+					  0);
+	return 0;
+}
diff --git a/tools/testing/selftests/hid/progs/hid_bpf_helpers.h b/tools/testing/selftests/hid/progs/hid_bpf_helpers.h
new file mode 100644
index 000000000000..b9fa33f7d580
--- /dev/null
+++ b/tools/testing/selftests/hid/progs/hid_bpf_helpers.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#ifndef __HID_BPF_HELPERS_H
+#define __HID_BPF_HELPERS_H
+
+/* following are kfuncs exported by HID for HID-BPF */
+extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx,
+			      unsigned int offset,
+			      const size_t __sz) __ksym;
+extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym;
+
+#endif /* __HID_BPF_HELPERS_H */

From 0baef37335dd4d5cffd00c9b8bbf2e0b71e4239f Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:46 +0100
Subject: [PATCH 04/33] HID: bpf jmp table: simplify the logic of cleaning up
 programs

Kind of a hack, but works for now:

Instead of listening for any close of eBPF program, we now
decrement the refcount when we insert it in our internal
map of fd progs.

This is safe to do because:
- we listen to any call of destructor of programs
- when a program is being destroyed, we disable it by removing
  it from any RCU list used by any HID device (so it will never
  be called)
- we then trigger a job to cleanup the prog fd map, but we overwrite
  the removal of the elements to not do anything on the programs, just
  remove the allocated space

This is better than previously because we can remove the map of known
programs and their usage count. We now rely on the refcount of
bpf, which has greater chances of being accurate.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/entrypoints/entrypoints.bpf.c |  40 +-
 .../hid/bpf/entrypoints/entrypoints.lskel.h   | 648 +++++-------------
 drivers/hid/bpf/hid_bpf_dispatch.c            |   2 +-
 drivers/hid/bpf/hid_bpf_dispatch.h            |   2 +-
 drivers/hid/bpf/hid_bpf_jmp_table.c           |  92 ++-
 5 files changed, 211 insertions(+), 573 deletions(-)

diff --git a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
index 41dd66d5fc7a..7c1895d9e5c0 100644
--- a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
+++ b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
@@ -7,7 +7,7 @@
 
 #define HID_BPF_MAX_PROGS 1024
 
-extern bool call_hid_bpf_prog_release(u64 prog, int table_cnt) __ksym;
+extern void call_hid_bpf_prog_put_deferred(struct work_struct *work) __ksym;
 
 struct {
 	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
@@ -16,13 +16,6 @@ struct {
 	__uint(value_size, sizeof(__u32));
 } hid_jmp_table SEC(".maps");
 
-struct {
-	__uint(type, BPF_MAP_TYPE_HASH);
-	__uint(max_entries, HID_BPF_MAX_PROGS * HID_BPF_PROG_TYPE_MAX);
-	__type(key, void *);
-	__type(value, __u8);
-} progs_map SEC(".maps");
-
 SEC("fmod_ret/__hid_bpf_tail_call")
 int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
 {
@@ -31,35 +24,10 @@ int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
 	return 0;
 }
 
-static void release_prog(u64 prog)
+SEC("fentry/bpf_prog_put_deferred")
+int BPF_PROG(hid_bpf_prog_put_deferred, struct work_struct *work)
 {
-	u8 *value;
-
-	value = bpf_map_lookup_elem(&progs_map, &prog);
-	if (!value)
-		return;
-
-	if (call_hid_bpf_prog_release(prog, *value))
-		bpf_map_delete_elem(&progs_map, &prog);
-}
-
-SEC("fexit/bpf_prog_release")
-int BPF_PROG(hid_prog_release, struct inode *inode, struct file *filp)
-{
-	u64 prog = (u64)filp->private_data;
-
-	release_prog(prog);
-
-	return 0;
-}
-
-SEC("fexit/bpf_free_inode")
-int BPF_PROG(hid_free_inode, struct inode *inode)
-{
-	u64 prog = (u64)inode->i_private;
-
-	release_prog(prog);
-
+	call_hid_bpf_prog_put_deferred(work);
 	return 0;
 }
 
diff --git a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
index aa7b7ab31abb..9ffb991b3e6f 100644
--- a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
+++ b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
@@ -9,17 +9,14 @@ struct entrypoints_bpf {
 	struct bpf_loader_ctx ctx;
 	struct {
 		struct bpf_map_desc hid_jmp_table;
-		struct bpf_map_desc progs_map;
 	} maps;
 	struct {
 		struct bpf_prog_desc hid_tail_call;
-		struct bpf_prog_desc hid_prog_release;
-		struct bpf_prog_desc hid_free_inode;
+		struct bpf_prog_desc hid_bpf_prog_put_deferred;
 	} progs;
 	struct {
 		int hid_tail_call_fd;
-		int hid_prog_release_fd;
-		int hid_free_inode_fd;
+		int hid_bpf_prog_put_deferred_fd;
 	} links;
 };
 
@@ -35,24 +32,13 @@ entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel)
 }
 
 static inline int
-entrypoints_bpf__hid_prog_release__attach(struct entrypoints_bpf *skel)
+entrypoints_bpf__hid_bpf_prog_put_deferred__attach(struct entrypoints_bpf *skel)
 {
-	int prog_fd = skel->progs.hid_prog_release.prog_fd;
+	int prog_fd = skel->progs.hid_bpf_prog_put_deferred.prog_fd;
 	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
 
 	if (fd > 0)
-		skel->links.hid_prog_release_fd = fd;
-	return fd;
-}
-
-static inline int
-entrypoints_bpf__hid_free_inode__attach(struct entrypoints_bpf *skel)
-{
-	int prog_fd = skel->progs.hid_free_inode.prog_fd;
-	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
-
-	if (fd > 0)
-		skel->links.hid_free_inode_fd = fd;
+		skel->links.hid_bpf_prog_put_deferred_fd = fd;
 	return fd;
 }
 
@@ -62,8 +48,7 @@ entrypoints_bpf__attach(struct entrypoints_bpf *skel)
 	int ret = 0;
 
 	ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel);
-	ret = ret < 0 ? ret : entrypoints_bpf__hid_prog_release__attach(skel);
-	ret = ret < 0 ? ret : entrypoints_bpf__hid_free_inode__attach(skel);
+	ret = ret < 0 ? ret : entrypoints_bpf__hid_bpf_prog_put_deferred__attach(skel);
 	return ret < 0 ? ret : 0;
 }
 
@@ -71,8 +56,7 @@ static inline void
 entrypoints_bpf__detach(struct entrypoints_bpf *skel)
 {
 	skel_closenz(skel->links.hid_tail_call_fd);
-	skel_closenz(skel->links.hid_prog_release_fd);
-	skel_closenz(skel->links.hid_free_inode_fd);
+	skel_closenz(skel->links.hid_bpf_prog_put_deferred_fd);
 }
 static void
 entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
@@ -81,10 +65,8 @@ entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
 		return;
 	entrypoints_bpf__detach(skel);
 	skel_closenz(skel->progs.hid_tail_call.prog_fd);
-	skel_closenz(skel->progs.hid_prog_release.prog_fd);
-	skel_closenz(skel->progs.hid_free_inode.prog_fd);
+	skel_closenz(skel->progs.hid_bpf_prog_put_deferred.prog_fd);
 	skel_closenz(skel->maps.hid_jmp_table.map_fd);
-	skel_closenz(skel->maps.progs_map.map_fd);
 	skel_free(skel);
 }
 static inline struct entrypoints_bpf *
@@ -109,7 +91,7 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 	int err;
 
 	opts.ctx = (struct bpf_loader_ctx *)skel;
-	opts.data_sz = 10624;
+	opts.data_sz = 3792;
 	opts.data = (void *)"\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
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@@ -144,475 +126,175 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
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 \0\0\x01\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\
 \0\0\x04\0\0\0\x03\0\0\0\x05\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\0\0\0\0\0\0\0\0\
 \x02\x06\0\0\0\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\0\x04\0\0\0\0\0\0\
 \0\0\0\x02\x08\0\0\0\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x04\0\0\0\0\
 \0\0\0\x04\0\0\x04\x20\0\0\0\x19\0\0\0\x01\0\0\0\0\0\0\0\x1e\0\0\0\x05\0\0\0\
 \x40\0\0\0\x2a\0\0\0\x07\0\0\0\x80\0\0\0\x33\0\0\0\x07\0\0\0\xc0\0\0\0\x3e\0\0\
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-\0\0\x2c\x07\0\0\x6f\0\0\0\x40\0\0\0\x32\x07\0\0\x1c\0\0\0\x60\0\0\0\x3a\x07\0\
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+	opts.insns_sz = 2056;
 	opts.insns = (void *)"\
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 \xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\x07\0\0\0\0\
-\0\0\xc5\x07\x72\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x50\x24\0\0\x63\x70\
-\x6c\0\0\0\0\0\x77\x07\0\0\x20\0\0\0\x63\x70\x70\0\0\0\0\0\xb7\x01\0\0\x05\0\0\
-\0\x18\x62\0\0\0\0\0\0\0\0\0\0\x50\x24\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\
-\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xc0\x24\0\0\x61\x01\0\0\
+\0\0\xc5\x07\x36\xff\0\0\0\0\x75\x07\x03\0\0\0\0\0\x62\x08\x04\0\0\0\0\0\x6a\
+\x08\x02\0\0\0\0\0\x05\0\x0a\0\0\0\0\0\x63\x78\x04\0\0\0\0\0\xbf\x79\0\0\0\0\0\
+\0\x77\x09\0\0\x20\0\0\0\x55\x09\x02\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x04\
+\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\x63\x90\0\0\0\0\0\0\x6a\x08\
+\x02\0\x40\0\0\0\xb7\x01\0\0\x05\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\x08\x0e\0\0\
+\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\
+\0\0\0\0\0\0\0\x01\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\
+\0\0\0\x85\0\0\0\xa8\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x78\x0e\0\0\x61\x01\0\0\
 \0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\
-\x60\xff\0\0\0\0\x63\x7a\x80\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xf8\x24\0\
-\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x88\x26\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\
-\0\0\0\0\0\0\0\x25\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x80\x26\0\0\x7b\x01\0\0\0\0\
-\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xa0\x25\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xc8\
-\x26\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xa8\x25\0\0\x18\x61\0\
-\0\0\0\0\0\0\0\0\0\xd8\x26\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\
-\x68\x26\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xf8\x26\0\0\x7b\x01\0\0\0\0\0\0\x18\
-\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xf0\x26\0\0\x7b\
-\x01\0\0\0\0\0\0\x61\x60\x08\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x90\x26\0\0\
-\x63\x01\0\0\0\0\0\0\x61\x60\x0c\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x94\x26\
-\0\0\x63\x01\0\0\0\0\0\0\x79\x60\x10\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x98\
-\x26\0\0\x7b\x01\0\0\0\0\0\0\x61\xa0\x78\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\
-\0\xc0\x26\0\0\x63\x01\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x08\x27\0\0\xb7\
-\x02\0\0\x11\0\0\0\xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\
-\0\xbf\x07\0\0\0\0\0\0\xc5\x07\x29\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x78\
-\x26\0\0\x63\x70\x6c\0\0\0\0\0\x77\x07\0\0\x20\0\0\0\x63\x70\x70\0\0\0\0\0\x18\
-\x68\0\0\0\0\0\0\0\0\0\0\x58\x25\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x20\x27\0\0\
-\xb7\x02\0\0\x1a\0\0\0\xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\
-\0\0\0\xbf\x07\0\0\0\0\0\0\xc5\x07\x1a\xff\0\0\0\0\x75\x07\x03\0\0\0\0\0\x62\
-\x08\x04\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x0a\0\0\0\0\0\x63\x78\x04\0\0\0\
-\0\0\xbf\x79\0\0\0\0\0\0\x77\x09\0\0\x20\0\0\0\x55\x09\x02\0\0\0\0\0\x6a\x08\
-\x02\0\0\0\0\0\x05\0\x04\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\x63\
-\x90\0\0\0\0\0\0\x6a\x08\x02\0\x40\0\0\0\xb7\x01\0\0\x05\0\0\0\x18\x62\0\0\0\0\
-\0\0\0\0\0\0\x78\x26\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\0\0\
-\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\
-\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\
-\xe8\x26\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\
-\0\0\0\xa8\0\0\0\xc5\x07\xf9\xfe\0\0\0\0\x63\x7a\x84\xff\0\0\0\0\x18\x60\0\0\0\
-\0\0\0\0\0\0\0\x40\x27\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xd0\x28\0\0\x7b\x01\0\0\
-\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x48\x27\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\
-\xc8\x28\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xe8\x27\0\0\x18\
-\x61\0\0\0\0\0\0\0\0\0\0\x10\x29\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\
-\0\0\0\xf0\x27\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x20\x29\0\0\x7b\x01\0\0\0\0\0\0\
-\x18\x60\0\0\0\0\0\0\0\0\0\0\xb0\x28\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x40\x29\0\
-\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\
-\0\0\0\0\x38\x29\0\0\x7b\x01\0\0\0\0\0\0\x61\x60\x08\0\0\0\0\0\x18\x61\0\0\0\0\
-\0\0\0\0\0\0\xd8\x28\0\0\x63\x01\0\0\0\0\0\0\x61\x60\x0c\0\0\0\0\0\x18\x61\0\0\
-\0\0\0\0\0\0\0\0\xdc\x28\0\0\x63\x01\0\0\0\0\0\0\x79\x60\x10\0\0\0\0\0\x18\x61\
-\0\0\0\0\0\0\0\0\0\0\xe0\x28\0\0\x7b\x01\0\0\0\0\0\0\x61\xa0\x78\xff\0\0\0\0\
-\x18\x61\0\0\0\0\0\0\0\0\0\0\x08\x29\0\0\x63\x01\0\0\0\0\0\0\x18\x61\0\0\0\0\0\
-\0\0\0\0\0\x50\x29\0\0\xb7\x02\0\0\x0f\0\0\0\xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\
-\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\x07\0\0\0\0\0\0\xc5\x07\xc2\xfe\0\0\0\0\x18\
-\x60\0\0\0\0\0\0\0\0\0\0\xc0\x28\0\0\x63\x70\x6c\0\0\0\0\0\x77\x07\0\0\x20\0\0\
-\0\x63\x70\x70\0\0\0\0\0\x18\x68\0\0\0\0\0\0\0\0\0\0\xa0\x27\0\0\x18\x61\0\0\0\
-\0\0\0\0\0\0\0\x60\x29\0\0\xb7\x02\0\0\x1a\0\0\0\xb7\x03\0\0\x0c\0\0\0\xb7\x04\
-\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\x07\0\0\0\0\0\0\xc5\x07\xb3\xfe\0\0\0\0\
-\x75\x07\x03\0\0\0\0\0\x62\x08\x04\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x0a\0\
-\0\0\0\0\x63\x78\x04\0\0\0\0\0\xbf\x79\0\0\0\0\0\0\x77\x09\0\0\x20\0\0\0\x55\
-\x09\x02\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x04\0\0\0\0\0\x18\x60\0\0\0\0\0\
-\0\0\0\0\0\0\x01\0\0\x63\x90\0\0\0\0\0\0\x6a\x08\x02\0\x40\0\0\0\xb7\x01\0\0\
-\x05\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\xc0\x28\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\
-\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\x61\
-\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\
-\x18\x60\0\0\0\0\0\0\0\0\0\0\x30\x29\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\
-\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\x92\xfe\0\0\0\0\x63\x7a\
-\x88\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\
-\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\x06\x38\0\0\0\0\0\x61\xa0\
-\x84\xff\0\0\0\0\x63\x06\x3c\0\0\0\0\0\x61\xa0\x88\xff\0\0\0\0\x63\x06\x40\0\0\
-\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\
-\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x28\0\
-\0\0\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
+\x15\xff\0\0\0\0\x63\x7a\x84\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\
+\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\
+\x06\x28\0\0\0\0\0\x61\xa0\x84\xff\0\0\0\0\x63\x06\x2c\0\0\0\0\0\x18\x61\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\0\0\0\xb7\0\0\0\0\0\
+\0\0\x95\0\0\0\0\0\0\0";
 	err = bpf_load_and_run(&opts);
 	if (err < 0)
 		return err;
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 600b00fdf6c1..0ef99caf937a 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -94,7 +94,7 @@ hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr
  * can use.
  */
 BTF_SET8_START(hid_bpf_kfunc_ids)
-BTF_ID_FLAGS(func, call_hid_bpf_prog_release)
+BTF_ID_FLAGS(func, call_hid_bpf_prog_put_deferred)
 BTF_ID_FLAGS(func, hid_bpf_get_data, KF_RET_NULL)
 BTF_SET8_END(hid_bpf_kfunc_ids)
 
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h
index 98c378e18b2b..e2d64faa3932 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.h
+++ b/drivers/hid/bpf/hid_bpf_dispatch.h
@@ -22,6 +22,6 @@ int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 struct bpf_prog;
 
 /* HID-BPF internal kfuncs API */
-bool call_hid_bpf_prog_release(u64 prog, int table_cnt);
+void call_hid_bpf_prog_put_deferred(struct work_struct *work);
 
 #endif
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index 05225ff3cc27..e5f171ab480c 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -39,7 +39,6 @@ struct hid_bpf_prog_entry {
 
 struct hid_bpf_jmp_table {
 	struct bpf_map *map;
-	struct bpf_map *prog_keys;
 	struct hid_bpf_prog_entry entries[HID_BPF_MAX_PROGS]; /* compacted list, circular buffer */
 	int tail, head;
 	struct bpf_prog *progs[HID_BPF_MAX_PROGS]; /* idx -> progs mapping */
@@ -286,32 +285,23 @@ static void hid_bpf_release_prog_at(int idx)
  */
 static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
 {
-	int i, cnt, index = -1, map_fd = -1, progs_map_fd = -1, err = -EINVAL;
+	int i, index = -1, map_fd = -1, err = -EINVAL;
 
 	/* retrieve a fd of our prog_array map in BPF */
 	map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
-	/* take an fd for the table of progs we monitor with SEC("fexit/bpf_prog_release") */
-	progs_map_fd = skel_map_get_fd_by_id(jmp_table.prog_keys->id);
 
-	if (map_fd < 0 || progs_map_fd < 0) {
+	if (map_fd < 0) {
 		err = -EINVAL;
 		goto out;
 	}
 
-	cnt = 0;
-	/* find the first available index in the jmp_table
-	 * and count how many time this program has been inserted
-	 */
+	/* find the first available index in the jmp_table */
 	for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
 		if (!jmp_table.progs[i] && index < 0) {
 			/* mark the index as used */
 			jmp_table.progs[i] = prog;
 			index = i;
 			__set_bit(i, jmp_table.enabled);
-			cnt++;
-		} else {
-			if (jmp_table.progs[i] == prog)
-				cnt++;
 		}
 	}
 	if (index < 0) {
@@ -324,10 +314,15 @@ static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
 	if (err)
 		goto out;
 
-	/* insert the program in the prog list table */
-	err = skel_map_update_elem(progs_map_fd, &prog, &cnt, 0);
-	if (err)
-		goto out;
+	/*
+	 * The program has been safely inserted, decrement the reference count
+	 * so it doesn't interfere with the number of actual user handles.
+	 * This is safe to do because:
+	 * - we overrite the put_ptr in the prog fd map
+	 * - we also have a cleanup function that monitors when a program gets
+	 *   released and we manually do the cleanup in the prog fd map
+	 */
+	bpf_prog_sub(prog, 1);
 
 	/* return the index */
 	err = index;
@@ -337,8 +332,6 @@ static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
 		__hid_bpf_do_release_prog(map_fd, index);
 	if (map_fd >= 0)
 		close_fd(map_fd);
-	if (progs_map_fd >= 0)
-		close_fd(progs_map_fd);
 	return err;
 }
 
@@ -457,41 +450,38 @@ void __hid_bpf_destroy_device(struct hid_device *hdev)
 	schedule_work(&release_work);
 }
 
-noinline bool
-call_hid_bpf_prog_release(u64 prog_key, int table_cnt)
+void call_hid_bpf_prog_put_deferred(struct work_struct *work)
 {
-	/* compare with how many refs are left in the bpf program */
-	struct bpf_prog *prog = (struct bpf_prog *)prog_key;
-	int idx;
+	struct bpf_prog_aux *aux;
+	struct bpf_prog *prog;
+	bool found = false;
+	int i;
 
-	if (!prog)
-		return false;
-
-	if (atomic64_read(&prog->aux->refcnt) != table_cnt)
-		return false;
+	aux = container_of(work, struct bpf_prog_aux, work);
+	prog = aux->prog;
 
 	/* we don't need locking here because the entries in the progs table
 	 * are stable:
 	 * if there are other users (and the progs entries might change), we
-	 * would return in the statement above.
+	 * would simply not have been called.
 	 */
-	for (idx = 0; idx < HID_BPF_MAX_PROGS; idx++) {
-		if (jmp_table.progs[idx] == prog) {
-			__clear_bit(idx, jmp_table.enabled);
-			break;
+	for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
+		if (jmp_table.progs[i] == prog) {
+			__clear_bit(i, jmp_table.enabled);
+			found = true;
 		}
 	}
-	if (idx >= HID_BPF_MAX_PROGS) {
-		/* should never happen if we get our refcount right */
-		idx = -1;
-	}
 
-	/* schedule release of all detached progs */
-	schedule_work(&release_work);
-	return idx >= 0;
+	if (found)
+		/* schedule release of all detached progs */
+		schedule_work(&release_work);
 }
 
-#define HID_BPF_PROGS_COUNT 3
+static void hid_bpf_prog_fd_array_put_ptr(void *ptr)
+{
+}
+
+#define HID_BPF_PROGS_COUNT 2
 
 static struct bpf_link *links[HID_BPF_PROGS_COUNT];
 static struct entrypoints_bpf *skel;
@@ -501,9 +491,6 @@ void hid_bpf_free_links_and_skel(void)
 	int i;
 
 	/* the following is enough to release all programs attached to hid */
-	if (jmp_table.prog_keys)
-		bpf_map_put_with_uref(jmp_table.prog_keys);
-
 	if (jmp_table.map)
 		bpf_map_put_with_uref(jmp_table.map);
 
@@ -533,6 +520,8 @@ void hid_bpf_free_links_and_skel(void)
 	idx++;									\
 } while (0)
 
+static struct bpf_map_ops hid_bpf_prog_fd_maps_ops;
+
 int hid_bpf_preload_skel(void)
 {
 	int err, idx = 0;
@@ -551,15 +540,14 @@ int hid_bpf_preload_skel(void)
 		goto out;
 	}
 
-	jmp_table.prog_keys = bpf_map_get_with_uref(skel->maps.progs_map.map_fd);
-	if (IS_ERR(jmp_table.prog_keys)) {
-		err = PTR_ERR(jmp_table.prog_keys);
-		goto out;
-	}
+	/* our jump table is stealing refs, so we should not decrement on removal of elements */
+	hid_bpf_prog_fd_maps_ops = *jmp_table.map->ops;
+	hid_bpf_prog_fd_maps_ops.map_fd_put_ptr = hid_bpf_prog_fd_array_put_ptr;
+
+	jmp_table.map->ops = &hid_bpf_prog_fd_maps_ops;
 
 	ATTACH_AND_STORE_LINK(hid_tail_call);
-	ATTACH_AND_STORE_LINK(hid_prog_release);
-	ATTACH_AND_STORE_LINK(hid_free_inode);
+	ATTACH_AND_STORE_LINK(hid_bpf_prog_put_deferred);
 
 	return 0;
 out:

From 658ee5a64fcfbbf758447fa3af425729eaabb0dc Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:47 +0100
Subject: [PATCH 05/33] HID: bpf: allocate data memory for device_event BPF
 programs

We need to also be able to change the size of the report.
Reducing it is easy, because we already have the incoming buffer that is
big enough, but extending it is harder.

Pre-allocate a buffer that is big enough to handle all reports of the
device, and use that as the primary buffer for BPF programs.
To be able to change the size of the buffer, we change the device_event
API and request it to return the size of the buffer.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/hid_bpf_dispatch.c  | 116 +++++++++++++++++++++++++---
 drivers/hid/bpf/hid_bpf_jmp_table.c |   4 +-
 drivers/hid/hid-core.c              |  12 ++-
 include/linux/hid_bpf.h             |  37 +++++++--
 4 files changed, 151 insertions(+), 18 deletions(-)

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 0ef99caf937a..efd4e4b4a615 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -28,8 +28,9 @@ EXPORT_SYMBOL(hid_bpf_ops);
  *
  * @ctx: The HID-BPF context
  *
- * @return %0 on success and keep processing; a negative error code to interrupt
- * the processing of this event
+ * @return %0 on success and keep processing; a positive value to change the
+ * incoming size buffer; a negative error code to interrupt the processing
+ * of this event
  *
  * Declare an %fmod_ret tracing bpf program to this function and attach this
  * program through hid_bpf_attach_prog() to have this helper called for
@@ -44,23 +45,43 @@ __weak noinline int hid_bpf_device_event(struct hid_bpf_ctx *ctx)
 }
 ALLOW_ERROR_INJECTION(hid_bpf_device_event, ERRNO);
 
-int
+u8 *
 dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type, u8 *data,
-			      u32 size, int interrupt)
+			      u32 *size, int interrupt)
 {
 	struct hid_bpf_ctx_kern ctx_kern = {
 		.ctx = {
 			.hid = hdev,
 			.report_type = type,
-			.size = size,
+			.allocated_size = hdev->bpf.allocated_data,
+			.size = *size,
 		},
-		.data = data,
+		.data = hdev->bpf.device_data,
 	};
+	int ret;
 
 	if (type >= HID_REPORT_TYPES)
-		return -EINVAL;
+		return ERR_PTR(-EINVAL);
 
-	return hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
+	/* no program has been attached yet */
+	if (!hdev->bpf.device_data)
+		return data;
+
+	memset(ctx_kern.data, 0, hdev->bpf.allocated_data);
+	memcpy(ctx_kern.data, data, *size);
+
+	ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	if (ret) {
+		if (ret > ctx_kern.ctx.allocated_size)
+			return ERR_PTR(-EINVAL);
+
+		*size = ret;
+	}
+
+	return ctx_kern.data;
 }
 EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event);
 
@@ -83,7 +104,7 @@ hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr
 
 	ctx_kern = container_of(ctx, struct hid_bpf_ctx_kern, ctx);
 
-	if (rdwr_buf_size + offset > ctx->size)
+	if (rdwr_buf_size + offset > ctx->allocated_size)
 		return NULL;
 
 	return ctx_kern->data + offset;
@@ -110,6 +131,51 @@ static int device_match_id(struct device *dev, const void *id)
 	return hdev->id == *(int *)id;
 }
 
+static int __hid_bpf_allocate_data(struct hid_device *hdev, u8 **data, u32 *size)
+{
+	u8 *alloc_data;
+	unsigned int i, j, max_report_len = 0;
+	size_t alloc_size = 0;
+
+	/* compute the maximum report length for this device */
+	for (i = 0; i < HID_REPORT_TYPES; i++) {
+		struct hid_report_enum *report_enum = hdev->report_enum + i;
+
+		for (j = 0; j < HID_MAX_IDS; j++) {
+			struct hid_report *report = report_enum->report_id_hash[j];
+
+			if (report)
+				max_report_len = max(max_report_len, hid_report_len(report));
+		}
+	}
+
+	/*
+	 * Give us a little bit of extra space and some predictability in the
+	 * buffer length we create. This way, we can tell users that they can
+	 * work on chunks of 64 bytes of memory without having the bpf verifier
+	 * scream at them.
+	 */
+	alloc_size = DIV_ROUND_UP(max_report_len, 64) * 64;
+
+	alloc_data = kzalloc(alloc_size, GFP_KERNEL);
+	if (!alloc_data)
+		return -ENOMEM;
+
+	*data = alloc_data;
+	*size = alloc_size;
+
+	return 0;
+}
+
+static int hid_bpf_allocate_event_data(struct hid_device *hdev)
+{
+	/* hdev->bpf.device_data is already allocated, abort */
+	if (hdev->bpf.device_data)
+		return 0;
+
+	return __hid_bpf_allocate_data(hdev, &hdev->bpf.device_data, &hdev->bpf.allocated_data);
+}
+
 /**
  * hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device
  *
@@ -125,7 +191,7 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 {
 	struct hid_device *hdev;
 	struct device *dev;
-	int prog_type = hid_bpf_get_prog_attach_type(prog_fd);
+	int err, prog_type = hid_bpf_get_prog_attach_type(prog_fd);
 
 	if (!hid_bpf_ops)
 		return -EINVAL;
@@ -145,6 +211,12 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 
 	hdev = to_hid_device(dev);
 
+	if (prog_type == HID_BPF_PROG_TYPE_DEVICE_EVENT) {
+		err = hid_bpf_allocate_event_data(hdev);
+		if (err)
+			return err;
+	}
+
 	return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
 }
 
@@ -158,6 +230,30 @@ static const struct btf_kfunc_id_set hid_bpf_syscall_kfunc_set = {
 	.set   = &hid_bpf_syscall_kfunc_ids,
 };
 
+int hid_bpf_connect_device(struct hid_device *hdev)
+{
+	struct hid_bpf_prog_list *prog_list;
+
+	rcu_read_lock();
+	prog_list = rcu_dereference(hdev->bpf.progs[HID_BPF_PROG_TYPE_DEVICE_EVENT]);
+	rcu_read_unlock();
+
+	/* only allocate BPF data if there are programs attached */
+	if (!prog_list)
+		return 0;
+
+	return hid_bpf_allocate_event_data(hdev);
+}
+EXPORT_SYMBOL_GPL(hid_bpf_connect_device);
+
+void hid_bpf_disconnect_device(struct hid_device *hdev)
+{
+	kfree(hdev->bpf.device_data);
+	hdev->bpf.device_data = NULL;
+	hdev->bpf.allocated_data = 0;
+}
+EXPORT_SYMBOL_GPL(hid_bpf_disconnect_device);
+
 void hid_bpf_destroy_device(struct hid_device *hdev)
 {
 	if (!hdev)
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index e5f171ab480c..bfcdd7b805a9 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -122,8 +122,10 @@ int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 
 		ctx_kern->ctx.index = idx;
 		err = __hid_bpf_tail_call(&ctx_kern->ctx);
-		if (err)
+		if (err < 0)
 			break;
+		if (err)
+			ctx_kern->ctx.retval = err;
 	}
 
  out_unlock:
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 1098c49b5d2e..400a7b8133c6 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2040,9 +2040,11 @@ int hid_input_report(struct hid_device *hid, enum hid_report_type type, u8 *data
 	report_enum = hid->report_enum + type;
 	hdrv = hid->driver;
 
-	ret = dispatch_hid_bpf_device_event(hid, type, data, size, interrupt);
-	if (ret)
+	data = dispatch_hid_bpf_device_event(hid, type, data, &size, interrupt);
+	if (IS_ERR(data)) {
+		ret = PTR_ERR(data);
 		goto unlock;
+	}
 
 	if (!size) {
 		dbg_hid("empty report\n");
@@ -2158,6 +2160,10 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
 	int len;
 	int ret;
 
+	ret = hid_bpf_connect_device(hdev);
+	if (ret)
+		return ret;
+
 	if (hdev->quirks & HID_QUIRK_HIDDEV_FORCE)
 		connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV);
 	if (hdev->quirks & HID_QUIRK_HIDINPUT_FORCE)
@@ -2259,6 +2265,8 @@ void hid_disconnect(struct hid_device *hdev)
 	if (hdev->claimed & HID_CLAIMED_HIDRAW)
 		hidraw_disconnect(hdev);
 	hdev->claimed = 0;
+
+	hid_bpf_disconnect_device(hdev);
 }
 EXPORT_SYMBOL_GPL(hid_disconnect);
 
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index de3fb1c376d2..b3de462ef3a6 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -28,15 +28,32 @@ struct hid_device;
  *         a bigger index).
  * @hid: the ``struct hid_device`` representing the device itself
  * @report_type: used for ``hid_bpf_device_event()``
+ * @allocated_size: Allocated size of data.
+ *
+ *                  This is how much memory is available and can be requested
+ *                  by the HID program.
+ *                  Note that for ``HID_BPF_RDESC_FIXUP``, that memory is set to
+ *                  ``4096`` (4 KB)
  * @size: Valid data in the data field.
  *
  *        Programs can get the available valid size in data by fetching this field.
+ *        Programs can also change this value by returning a positive number in the
+ *        program.
+ *        To discard the event, return a negative error code.
+ *
+ *        ``size`` must always be less or equal than ``allocated_size`` (it is enforced
+ *        once all BPF programs have been run).
+ * @retval: Return value of the previous program.
  */
 struct hid_bpf_ctx {
 	__u32 index;
 	const struct hid_device *hid;
+	__u32 allocated_size;
 	enum hid_report_type report_type;
-	__s32 size;
+	union {
+		__s32 retval;
+		__s32 size;
+	};
 };
 
 /**
@@ -96,6 +113,12 @@ struct hid_bpf_prog_list {
 
 /* stored in each device */
 struct hid_bpf {
+	u8 *device_data;		/* allocated when a bpf program of type
+					 * SEC(f.../hid_bpf_device_event) has been attached
+					 * to this HID device
+					 */
+	u32 allocated_data;
+
 	struct hid_bpf_prog_list __rcu *progs[HID_BPF_PROG_TYPE_MAX];	/* attached BPF progs */
 	bool destroyed;			/* prevents the assignment of any progs */
 
@@ -103,13 +126,17 @@ struct hid_bpf {
 };
 
 #ifdef CONFIG_HID_BPF
-int dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data,
-				  u32 size, int interrupt);
+u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data,
+				  u32 *size, int interrupt);
+int hid_bpf_connect_device(struct hid_device *hdev);
+void hid_bpf_disconnect_device(struct hid_device *hdev);
 void hid_bpf_destroy_device(struct hid_device *hid);
 void hid_bpf_device_init(struct hid_device *hid);
 #else /* CONFIG_HID_BPF */
-static inline int dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type,
-						u8 *data, u32 size, int interrupt) { return 0; }
+static inline u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type,
+						u8 *data, u32 *size, int interrupt) { return NULL; }
+static inline int hid_bpf_connect_device(struct hid_device *hdev) { return 0; }
+static inline void hid_bpf_disconnect_device(struct hid_device *hdev) {}
 static inline void hid_bpf_destroy_device(struct hid_device *hid) {}
 static inline void hid_bpf_device_init(struct hid_device *hid) {}
 #endif /* CONFIG_HID_BPF */

From 0330f725cc5b01f4149a2a21e474b2090a1dcead Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:48 +0100
Subject: [PATCH 06/33] selftests/hid: add test to change the report size

Use a different report with a bigger size and ensures we are doing
things properly.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 tools/testing/selftests/hid/hid_bpf.c   | 41 +++++++++++++++++++++++++
 tools/testing/selftests/hid/progs/hid.c | 15 ++++++++-
 2 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index 4fc7794c6f8b..6c1f43ec4bdd 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -22,6 +22,17 @@ static unsigned char rdesc[] = {
 	0xa1, 0x01,		/* COLLECTION (Application) */
 	0x09, 0x01,			/* Usage (Vendor Usage 0x01) */
 	0xa1, 0x00,			/* COLLECTION (Physical) */
+	0x85, 0x02,				/* REPORT_ID (2) */
+	0x19, 0x01,				/* USAGE_MINIMUM (1) */
+	0x29, 0x08,				/* USAGE_MAXIMUM (3) */
+	0x15, 0x00,				/* LOGICAL_MINIMUM (0) */
+	0x25, 0xff,				/* LOGICAL_MAXIMUM (255) */
+	0x95, 0x08,				/* REPORT_COUNT (8) */
+	0x75, 0x08,				/* REPORT_SIZE (8) */
+	0x81, 0x02,				/* INPUT (Data,Var,Abs) */
+	0xc0,				/* END_COLLECTION */
+	0x09, 0x01,			/* Usage (Vendor Usage 0x01) */
+	0xa1, 0x00,			/* COLLECTION (Physical) */
 	0x85, 0x01,				/* REPORT_ID (1) */
 	0x06, 0x00, 0xff,			/* Usage Page (Vendor Defined Page 1) */
 	0x19, 0x01,				/* USAGE_MINIMUM (1) */
@@ -645,6 +656,36 @@ TEST_F(hid_bpf, test_attach_detach)
 	ASSERT_EQ(buf[2], 47);
 }
 
+/*
+ * Attach hid_change_report_id to the given uhid device,
+ * retrieve and open the matching hidraw node,
+ * inject one event in the uhid device,
+ * check that the program sees it and can change the data
+ */
+TEST_F(hid_bpf, test_hid_change_report)
+{
+	const struct test_program progs[] = {
+		{ .name = "hid_change_report_id" },
+	};
+	__u8 buf[10] = {0};
+	int err;
+
+	LOAD_PROGRAMS(progs);
+
+	/* inject one event */
+	buf[0] = 1;
+	buf[1] = 42;
+	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+
+	/* read the data from hidraw */
+	memset(buf, 0, sizeof(buf));
+	err = read(self->hidraw_fd, buf, sizeof(buf));
+	ASSERT_EQ(err, 9) TH_LOG("read_hidraw");
+	ASSERT_EQ(buf[0], 2);
+	ASSERT_EQ(buf[1], 42);
+	ASSERT_EQ(buf[2], 0) TH_LOG("leftovers_from_previous_test");
+}
+
 static int libbpf_print_fn(enum libbpf_print_level level,
 			   const char *format, va_list args)
 {
diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c
index b23ae2304346..b69c3f8e1ac3 100644
--- a/tools/testing/selftests/hid/progs/hid.c
+++ b/tools/testing/selftests/hid/progs/hid.c
@@ -28,7 +28,20 @@ int BPF_PROG(hid_first_event, struct hid_bpf_ctx *hid_ctx)
 
 	rw_data[2] = rw_data[1] + 5;
 
-	return 0;
+	return hid_ctx->size;
+}
+
+SEC("?fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_change_report_id, struct hid_bpf_ctx *hid_ctx)
+{
+	__u8 *rw_data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 3 /* size */);
+
+	if (!rw_data)
+		return 0; /* EPERM check */
+
+	rw_data[0] = 2;
+
+	return 9;
 }
 
 SEC("syscall")

From 91a7f802d1852f60139712bdcfa98db547ce0531 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:49 +0100
Subject: [PATCH 07/33] HID: bpf: introduce hid_hw_request()

This function can not be called under IRQ, thus it is only available
while in SEC("syscall").
For consistency, this function requires a HID-BPF context to work with,
and so we also provide a helper to create one based on the HID unique
ID.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

--

changes in v12:
- variable dereferenced before check 'ctx'
  |Reported-by: kernel test robot <lkp@intel.com>
  |Reported-by: Dan Carpenter <error27@gmail.com>

no changes in v11

no changes in v10

changes in v9:
- fixed kfunc declaration aaccording to latest upstream changes

no changes in v8

changes in v7:
- hid_bpf_allocate_context: remove unused variable
- ensures buf is not NULL

changes in v6:
- rename parameter size into buf__sz to teach the verifier about
  the actual buffer size used by the call
- remove the allocated data in the user created context, it's not used

new-ish in v5
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/hid_bpf_dispatch.c | 134 +++++++++++++++++++++++++++++
 drivers/hid/hid-core.c             |   2 +
 include/linux/hid_bpf.h            |  13 ++-
 3 files changed, 148 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index efd4e4b4a615..0fe856d67f12 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -220,9 +220,143 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 	return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
 }
 
+/**
+ * hid_bpf_allocate_context - Allocate a context to the given HID device
+ *
+ * @hid_id: the system unique identifier of the HID device
+ *
+ * @returns A pointer to &struct hid_bpf_ctx on success, %NULL on error.
+ */
+noinline struct hid_bpf_ctx *
+hid_bpf_allocate_context(unsigned int hid_id)
+{
+	struct hid_device *hdev;
+	struct hid_bpf_ctx_kern *ctx_kern = NULL;
+	struct device *dev;
+
+	if (!hid_bpf_ops)
+		return NULL;
+
+	dev = bus_find_device(hid_bpf_ops->bus_type, NULL, &hid_id, device_match_id);
+	if (!dev)
+		return NULL;
+
+	hdev = to_hid_device(dev);
+
+	ctx_kern = kzalloc(sizeof(*ctx_kern), GFP_KERNEL);
+	if (!ctx_kern)
+		return NULL;
+
+	ctx_kern->ctx.hid = hdev;
+
+	return &ctx_kern->ctx;
+}
+
+/**
+ * hid_bpf_release_context - Release the previously allocated context @ctx
+ *
+ * @ctx: the HID-BPF context to release
+ *
+ */
+noinline void
+hid_bpf_release_context(struct hid_bpf_ctx *ctx)
+{
+	struct hid_bpf_ctx_kern *ctx_kern;
+
+	if (!ctx)
+		return;
+
+	ctx_kern = container_of(ctx, struct hid_bpf_ctx_kern, ctx);
+
+	kfree(ctx_kern);
+}
+
+/**
+ * hid_bpf_hw_request - Communicate with a HID device
+ *
+ * @ctx: the HID-BPF context previously allocated in hid_bpf_allocate_context()
+ * @buf: a %PTR_TO_MEM buffer
+ * @buf__sz: the size of the data to transfer
+ * @rtype: the type of the report (%HID_INPUT_REPORT, %HID_FEATURE_REPORT, %HID_OUTPUT_REPORT)
+ * @reqtype: the type of the request (%HID_REQ_GET_REPORT, %HID_REQ_SET_REPORT, ...)
+ *
+ * @returns %0 on success, a negative error code otherwise.
+ */
+noinline int
+hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
+		   enum hid_report_type rtype, enum hid_class_request reqtype)
+{
+	struct hid_device *hdev;
+	struct hid_report *report;
+	struct hid_report_enum *report_enum;
+	u8 *dma_data;
+	u32 report_len;
+	int ret;
+
+	/* check arguments */
+	if (!ctx || !hid_bpf_ops || !buf)
+		return -EINVAL;
+
+	switch (rtype) {
+	case HID_INPUT_REPORT:
+	case HID_OUTPUT_REPORT:
+	case HID_FEATURE_REPORT:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (reqtype) {
+	case HID_REQ_GET_REPORT:
+	case HID_REQ_GET_IDLE:
+	case HID_REQ_GET_PROTOCOL:
+	case HID_REQ_SET_REPORT:
+	case HID_REQ_SET_IDLE:
+	case HID_REQ_SET_PROTOCOL:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (buf__sz < 1)
+		return -EINVAL;
+
+	hdev = (struct hid_device *)ctx->hid; /* discard const */
+
+	report_enum = hdev->report_enum + rtype;
+	report = hid_bpf_ops->hid_get_report(report_enum, buf);
+	if (!report)
+		return -EINVAL;
+
+	report_len = hid_report_len(report);
+
+	if (buf__sz > report_len)
+		buf__sz = report_len;
+
+	dma_data = kmemdup(buf, buf__sz, GFP_KERNEL);
+	if (!dma_data)
+		return -ENOMEM;
+
+	ret = hid_bpf_ops->hid_hw_raw_request(hdev,
+					      dma_data[0],
+					      dma_data,
+					      buf__sz,
+					      rtype,
+					      reqtype);
+
+	if (ret > 0)
+		memcpy(buf, dma_data, ret);
+
+	kfree(dma_data);
+	return ret;
+}
+
 /* for syscall HID-BPF */
 BTF_SET8_START(hid_bpf_syscall_kfunc_ids)
 BTF_ID_FLAGS(func, hid_bpf_attach_prog)
+BTF_ID_FLAGS(func, hid_bpf_allocate_context, KF_ACQUIRE | KF_RET_NULL)
+BTF_ID_FLAGS(func, hid_bpf_release_context, KF_RELEASE)
+BTF_ID_FLAGS(func, hid_bpf_hw_request)
 BTF_SET8_END(hid_bpf_syscall_kfunc_ids)
 
 static const struct btf_kfunc_id_set hid_bpf_syscall_kfunc_set = {
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 400a7b8133c6..6bf47e352f23 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2919,6 +2919,8 @@ EXPORT_SYMBOL_GPL(hid_check_keys_pressed);
 
 #ifdef CONFIG_HID_BPF
 static struct hid_bpf_ops hid_ops = {
+	.hid_get_report = hid_get_report,
+	.hid_hw_raw_request = hid_hw_raw_request,
 	.owner = THIS_MODULE,
 	.bus_type = &hid_bus_type,
 };
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index b3de462ef3a6..1d24b72059bc 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -76,11 +76,15 @@ enum hid_bpf_attach_flags {
 int hid_bpf_device_event(struct hid_bpf_ctx *ctx);
 
 /* Following functions are kfunc that we export to BPF programs */
-/* only available in tracing */
+/* available everywhere in HID-BPF */
 __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t __sz);
 
 /* only available in syscall */
 int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags);
+int hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
+		       enum hid_report_type rtype, enum hid_class_request reqtype);
+struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id);
+void hid_bpf_release_context(struct hid_bpf_ctx *ctx);
 
 /*
  * Below is HID internal
@@ -99,7 +103,14 @@ enum hid_bpf_prog_type {
 	HID_BPF_PROG_TYPE_MAX,
 };
 
+struct hid_report_enum;
+
 struct hid_bpf_ops {
+	struct hid_report *(*hid_get_report)(struct hid_report_enum *report_enum, const u8 *data);
+	int (*hid_hw_raw_request)(struct hid_device *hdev,
+				  unsigned char reportnum, __u8 *buf,
+				  size_t len, enum hid_report_type rtype,
+				  enum hid_class_request reqtype);
 	struct module *owner;
 	struct bus_type *bus_type;
 };

From 4f7153cf461ed0f78d8da8c9fd02d38728a76b90 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:50 +0100
Subject: [PATCH 08/33] selftests/hid: add tests for bpf_hid_hw_request

Add tests for the newly implemented function.
We test here only the GET_REPORT part because the other calls are pure
HID protocol and won't infer the result of the test of the bpf hook.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 tools/testing/selftests/hid/hid_bpf.c         | 56 ++++++++++++++++++-
 tools/testing/selftests/hid/progs/hid.c       | 36 ++++++++++++
 .../selftests/hid/progs/hid_bpf_helpers.h     |  7 +++
 3 files changed, 98 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index 6c1f43ec4bdd..f77ee7fe4af4 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -82,12 +82,23 @@ static unsigned char rdesc[] = {
 	0xc0,			/* END_COLLECTION */
 };
 
+static __u8 feature_data[] = { 1, 2 };
+
 struct attach_prog_args {
 	int prog_fd;
 	unsigned int hid;
 	int retval;
 };
 
+struct hid_hw_request_syscall_args {
+	__u8 data[10];
+	unsigned int hid;
+	int retval;
+	size_t size;
+	enum hid_report_type type;
+	__u8 request_type;
+};
+
 #define ASSERT_OK(data) ASSERT_FALSE(data)
 #define ASSERT_OK_PTR(ptr) ASSERT_NE(NULL, ptr)
 
@@ -155,7 +166,7 @@ static void uhid_destroy(struct __test_metadata *_metadata, int fd)
 
 static int uhid_event(struct __test_metadata *_metadata, int fd)
 {
-	struct uhid_event ev;
+	struct uhid_event ev, answer;
 	ssize_t ret;
 
 	memset(&ev, 0, sizeof(ev));
@@ -196,6 +207,15 @@ static int uhid_event(struct __test_metadata *_metadata, int fd)
 		break;
 	case UHID_GET_REPORT:
 		UHID_LOG("UHID_GET_REPORT from uhid-dev");
+
+		answer.type = UHID_GET_REPORT_REPLY;
+		answer.u.get_report_reply.id = ev.u.get_report.id;
+		answer.u.get_report_reply.err = ev.u.get_report.rnum == 1 ? 0 : -EIO;
+		answer.u.get_report_reply.size = sizeof(feature_data);
+		memcpy(answer.u.get_report_reply.data, feature_data, sizeof(feature_data));
+
+		uhid_write(_metadata, fd, &answer);
+
 		break;
 	case UHID_SET_REPORT:
 		UHID_LOG("UHID_SET_REPORT from uhid-dev");
@@ -686,6 +706,40 @@ TEST_F(hid_bpf, test_hid_change_report)
 	ASSERT_EQ(buf[2], 0) TH_LOG("leftovers_from_previous_test");
 }
 
+/*
+ * Attach hid_user_raw_request to the given uhid device,
+ * call the bpf program from userspace
+ * check that the program is called and does the expected.
+ */
+TEST_F(hid_bpf, test_hid_user_raw_request_call)
+{
+	struct hid_hw_request_syscall_args args = {
+		.retval = -1,
+		.type = HID_FEATURE_REPORT,
+		.request_type = HID_REQ_GET_REPORT,
+		.size = 10,
+	};
+	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattrs,
+			    .ctx_in = &args,
+			    .ctx_size_in = sizeof(args),
+	);
+	int err, prog_fd;
+
+	LOAD_BPF;
+
+	args.hid = self->hid_id;
+	args.data[0] = 1; /* report ID */
+
+	prog_fd = bpf_program__fd(self->skel->progs.hid_user_raw_request);
+
+	err = bpf_prog_test_run_opts(prog_fd, &tattrs);
+	ASSERT_OK(err) TH_LOG("error while calling bpf_prog_test_run_opts");
+
+	ASSERT_EQ(args.retval, 2);
+
+	ASSERT_EQ(args.data[1], 2);
+}
+
 static int libbpf_print_fn(enum libbpf_print_level level,
 			   const char *format, va_list args)
 {
diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c
index b69c3f8e1ac3..7e35bb8e1abf 100644
--- a/tools/testing/selftests/hid/progs/hid.c
+++ b/tools/testing/selftests/hid/progs/hid.c
@@ -52,3 +52,39 @@ int attach_prog(struct attach_prog_args *ctx)
 					  0);
 	return 0;
 }
+
+struct hid_hw_request_syscall_args {
+	/* data needs to come at offset 0 so we can use it in calls */
+	__u8 data[10];
+	unsigned int hid;
+	int retval;
+	size_t size;
+	enum hid_report_type type;
+	__u8 request_type;
+};
+
+SEC("syscall")
+int hid_user_raw_request(struct hid_hw_request_syscall_args *args)
+{
+	struct hid_bpf_ctx *ctx;
+	const size_t size = args->size;
+	int i, ret = 0;
+
+	if (size > sizeof(args->data))
+		return -7; /* -E2BIG */
+
+	ctx = hid_bpf_allocate_context(args->hid);
+	if (!ctx)
+		return -1; /* EPERM check */
+
+	ret = hid_bpf_hw_request(ctx,
+				 args->data,
+				 size,
+				 args->type,
+				 args->request_type);
+	args->retval = ret;
+
+	hid_bpf_release_context(ctx);
+
+	return 0;
+}
diff --git a/tools/testing/selftests/hid/progs/hid_bpf_helpers.h b/tools/testing/selftests/hid/progs/hid_bpf_helpers.h
index b9fa33f7d580..4fff31dbe0e7 100644
--- a/tools/testing/selftests/hid/progs/hid_bpf_helpers.h
+++ b/tools/testing/selftests/hid/progs/hid_bpf_helpers.h
@@ -10,5 +10,12 @@ extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx,
 			      unsigned int offset,
 			      const size_t __sz) __ksym;
 extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym;
+extern struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id) __ksym;
+extern void hid_bpf_release_context(struct hid_bpf_ctx *ctx) __ksym;
+extern int hid_bpf_hw_request(struct hid_bpf_ctx *ctx,
+			      __u8 *data,
+			      size_t buf__sz,
+			      enum hid_report_type type,
+			      enum hid_class_request reqtype) __ksym;
 
 #endif /* __HID_BPF_HELPERS_H */

From ad190df11a024c1214fbc8dcaab72c592c79d9b5 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:51 +0100
Subject: [PATCH 09/33] HID: bpf: allow to change the report descriptor

Add a new tracepoint hid_bpf_rdesc_fixup() so we can trigger a
report descriptor fixup in the bpf world.

Whenever the program gets attached/detached, the device is reconnected
meaning that userspace will see it disappearing and reappearing with
the new report descriptor.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/hid_bpf_dispatch.c  | 80 ++++++++++++++++++++++++++++-
 drivers/hid/bpf/hid_bpf_dispatch.h  |  1 +
 drivers/hid/bpf/hid_bpf_jmp_table.c |  7 +++
 drivers/hid/hid-core.c              |  3 +-
 include/linux/hid_bpf.h             |  8 +++
 5 files changed, 97 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 0fe856d67f12..c3920c7964dc 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -15,6 +15,7 @@
 #include <linux/hid_bpf.h>
 #include <linux/init.h>
 #include <linux/kfifo.h>
+#include <linux/minmax.h>
 #include <linux/module.h>
 #include <linux/workqueue.h>
 #include "hid_bpf_dispatch.h"
@@ -85,6 +86,65 @@ dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type
 }
 EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event);
 
+/**
+ * hid_bpf_rdesc_fixup - Called when the probe function parses the report
+ * descriptor of the HID device
+ *
+ * @ctx: The HID-BPF context
+ *
+ * @return 0 on success and keep processing; a positive value to change the
+ * incoming size buffer; a negative error code to interrupt the processing
+ * of this event
+ *
+ * Declare an %fmod_ret tracing bpf program to this function and attach this
+ * program through hid_bpf_attach_prog() to have this helper called before any
+ * parsing of the report descriptor by HID.
+ */
+/* never used by the kernel but declared so we can load and attach a tracepoint */
+__weak noinline int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx)
+{
+	return 0;
+}
+ALLOW_ERROR_INJECTION(hid_bpf_rdesc_fixup, ERRNO);
+
+u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size)
+{
+	int ret;
+	struct hid_bpf_ctx_kern ctx_kern = {
+		.ctx = {
+			.hid = hdev,
+			.size = *size,
+			.allocated_size = HID_MAX_DESCRIPTOR_SIZE,
+		},
+	};
+
+	ctx_kern.data = kzalloc(ctx_kern.ctx.allocated_size, GFP_KERNEL);
+	if (!ctx_kern.data)
+		goto ignore_bpf;
+
+	memcpy(ctx_kern.data, rdesc, min_t(unsigned int, *size, HID_MAX_DESCRIPTOR_SIZE));
+
+	ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_RDESC_FIXUP, &ctx_kern);
+	if (ret < 0)
+		goto ignore_bpf;
+
+	if (ret) {
+		if (ret > ctx_kern.ctx.allocated_size)
+			goto ignore_bpf;
+
+		*size = ret;
+	}
+
+	rdesc = krealloc(ctx_kern.data, *size, GFP_KERNEL);
+
+	return rdesc;
+
+ ignore_bpf:
+	kfree(ctx_kern.data);
+	return kmemdup(rdesc, *size, GFP_KERNEL);
+}
+EXPORT_SYMBOL_GPL(call_hid_bpf_rdesc_fixup);
+
 /**
  * hid_bpf_get_data - Get the kernel memory pointer associated with the context @ctx
  *
@@ -176,6 +236,14 @@ static int hid_bpf_allocate_event_data(struct hid_device *hdev)
 	return __hid_bpf_allocate_data(hdev, &hdev->bpf.device_data, &hdev->bpf.allocated_data);
 }
 
+int hid_bpf_reconnect(struct hid_device *hdev)
+{
+	if (!test_and_set_bit(ffs(HID_STAT_REPROBED), &hdev->status))
+		return device_reprobe(&hdev->dev);
+
+	return 0;
+}
+
 /**
  * hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device
  *
@@ -217,7 +285,17 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 			return err;
 	}
 
-	return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
+	err = __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
+	if (err)
+		return err;
+
+	if (prog_type == HID_BPF_PROG_TYPE_RDESC_FIXUP) {
+		err = hid_bpf_reconnect(hdev);
+		if (err)
+			return err;
+	}
+
+	return 0;
 }
 
 /**
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h
index e2d64faa3932..2eeab1f746dd 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.h
+++ b/drivers/hid/bpf/hid_bpf_dispatch.h
@@ -18,6 +18,7 @@ int __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_t
 void __hid_bpf_destroy_device(struct hid_device *hdev);
 int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 		     struct hid_bpf_ctx_kern *ctx_kern);
+int hid_bpf_reconnect(struct hid_device *hdev);
 
 struct bpf_prog;
 
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index bfcdd7b805a9..579a6c06906e 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -58,12 +58,15 @@ static DECLARE_WORK(release_work, hid_bpf_release_progs);
 
 BTF_ID_LIST(hid_bpf_btf_ids)
 BTF_ID(func, hid_bpf_device_event)			/* HID_BPF_PROG_TYPE_DEVICE_EVENT */
+BTF_ID(func, hid_bpf_rdesc_fixup)			/* HID_BPF_PROG_TYPE_RDESC_FIXUP */
 
 static int hid_bpf_max_programs(enum hid_bpf_prog_type type)
 {
 	switch (type) {
 	case HID_BPF_PROG_TYPE_DEVICE_EVENT:
 		return HID_BPF_MAX_PROGS_PER_DEV;
+	case HID_BPF_PROG_TYPE_RDESC_FIXUP:
+		return 1;
 	default:
 		return -EINVAL;
 	}
@@ -233,6 +236,10 @@ static void hid_bpf_release_progs(struct work_struct *work)
 				if (next->hdev == hdev && next->type == type)
 					next->hdev = NULL;
 			}
+
+			/* if type was rdesc fixup, reconnect device */
+			if (type == HID_BPF_PROG_TYPE_RDESC_FIXUP)
+				hid_bpf_reconnect(hdev);
 		}
 	}
 
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 6bf47e352f23..fa4436b8101e 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1218,7 +1218,8 @@ int hid_open_report(struct hid_device *device)
 		return -ENODEV;
 	size = device->dev_rsize;
 
-	buf = kmemdup(start, size, GFP_KERNEL);
+	/* call_hid_bpf_rdesc_fixup() ensures we work on a copy of rdesc */
+	buf = call_hid_bpf_rdesc_fixup(device, start, &size);
 	if (buf == NULL)
 		return -ENOMEM;
 
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index 1d24b72059bc..9b11f8f25ad5 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -74,6 +74,7 @@ enum hid_bpf_attach_flags {
 
 /* Following functions are tracepoints that BPF programs can attach to */
 int hid_bpf_device_event(struct hid_bpf_ctx *ctx);
+int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx);
 
 /* Following functions are kfunc that we export to BPF programs */
 /* available everywhere in HID-BPF */
@@ -100,6 +101,7 @@ int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx);
 enum hid_bpf_prog_type {
 	HID_BPF_PROG_TYPE_UNDEF = -1,
 	HID_BPF_PROG_TYPE_DEVICE_EVENT,			/* an event is emitted from the device */
+	HID_BPF_PROG_TYPE_RDESC_FIXUP,
 	HID_BPF_PROG_TYPE_MAX,
 };
 
@@ -143,6 +145,7 @@ int hid_bpf_connect_device(struct hid_device *hdev);
 void hid_bpf_disconnect_device(struct hid_device *hdev);
 void hid_bpf_destroy_device(struct hid_device *hid);
 void hid_bpf_device_init(struct hid_device *hid);
+u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size);
 #else /* CONFIG_HID_BPF */
 static inline u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type,
 						u8 *data, u32 *size, int interrupt) { return NULL; }
@@ -150,6 +153,11 @@ static inline int hid_bpf_connect_device(struct hid_device *hdev) { return 0; }
 static inline void hid_bpf_disconnect_device(struct hid_device *hdev) {}
 static inline void hid_bpf_destroy_device(struct hid_device *hid) {}
 static inline void hid_bpf_device_init(struct hid_device *hid) {}
+static inline u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size)
+{
+	return kmemdup(rdesc, *size, GFP_KERNEL);
+}
+
 #endif /* CONFIG_HID_BPF */
 
 #endif /* __HID_BPF_H */

From e8445737c0264cf4ddac682c278e0ef5b8a61a3d Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:52 +0100
Subject: [PATCH 10/33] selftests/hid: add report descriptor fixup tests

Simple report descriptor override in HID: replace part of the report
descriptor from a static definition in the bpf kernel program.

Note that this test should be run last because we disconnect/reconnect
the device, meaning that it changes the overall uhid device.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 tools/testing/selftests/hid/hid_bpf.c   | 32 +++++++++++++++
 tools/testing/selftests/hid/progs/hid.c | 53 +++++++++++++++++++++++++
 2 files changed, 85 insertions(+)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index f77ee7fe4af4..eb329b5d299f 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -740,6 +740,38 @@ TEST_F(hid_bpf, test_hid_user_raw_request_call)
 	ASSERT_EQ(args.data[1], 2);
 }
 
+/*
+ * Attach hid_rdesc_fixup to the given uhid device,
+ * retrieve and open the matching hidraw node,
+ * check that the hidraw report descriptor has been updated.
+ */
+TEST_F(hid_bpf, test_rdesc_fixup)
+{
+	struct hidraw_report_descriptor rpt_desc = {0};
+	const struct test_program progs[] = {
+		{ .name = "hid_rdesc_fixup" },
+	};
+	int err, desc_size;
+
+	LOAD_PROGRAMS(progs);
+
+	/* check that hid_rdesc_fixup() was executed */
+	ASSERT_EQ(self->skel->data->callback2_check, 0x21);
+
+	/* read the exposed report descriptor from hidraw */
+	err = ioctl(self->hidraw_fd, HIDIOCGRDESCSIZE, &desc_size);
+	ASSERT_GE(err, 0) TH_LOG("error while reading HIDIOCGRDESCSIZE: %d", err);
+
+	/* ensure the new size of the rdesc is bigger than the old one */
+	ASSERT_GT(desc_size, sizeof(rdesc));
+
+	rpt_desc.size = desc_size;
+	err = ioctl(self->hidraw_fd, HIDIOCGRDESC, &rpt_desc);
+	ASSERT_GE(err, 0) TH_LOG("error while reading HIDIOCGRDESC: %d", err);
+
+	ASSERT_EQ(rpt_desc.value[4], 0x42);
+}
+
 static int libbpf_print_fn(enum libbpf_print_level level,
 			   const char *format, va_list args)
 {
diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c
index 7e35bb8e1abf..5758366a90e6 100644
--- a/tools/testing/selftests/hid/progs/hid.c
+++ b/tools/testing/selftests/hid/progs/hid.c
@@ -88,3 +88,56 @@ int hid_user_raw_request(struct hid_hw_request_syscall_args *args)
 
 	return 0;
 }
+
+static const __u8 rdesc[] = {
+	0x05, 0x01,				/* USAGE_PAGE (Generic Desktop) */
+	0x09, 0x32,				/* USAGE (Z) */
+	0x95, 0x01,				/* REPORT_COUNT (1) */
+	0x81, 0x06,				/* INPUT (Data,Var,Rel) */
+
+	0x06, 0x00, 0xff,			/* Usage Page (Vendor Defined Page 1) */
+	0x19, 0x01,				/* USAGE_MINIMUM (1) */
+	0x29, 0x03,				/* USAGE_MAXIMUM (3) */
+	0x15, 0x00,				/* LOGICAL_MINIMUM (0) */
+	0x25, 0x01,				/* LOGICAL_MAXIMUM (1) */
+	0x95, 0x03,				/* REPORT_COUNT (3) */
+	0x75, 0x01,				/* REPORT_SIZE (1) */
+	0x91, 0x02,				/* Output (Data,Var,Abs) */
+	0x95, 0x01,				/* REPORT_COUNT (1) */
+	0x75, 0x05,				/* REPORT_SIZE (5) */
+	0x91, 0x01,				/* Output (Cnst,Var,Abs) */
+
+	0x06, 0x00, 0xff,			/* Usage Page (Vendor Defined Page 1) */
+	0x19, 0x06,				/* USAGE_MINIMUM (6) */
+	0x29, 0x08,				/* USAGE_MAXIMUM (8) */
+	0x15, 0x00,				/* LOGICAL_MINIMUM (0) */
+	0x25, 0x01,				/* LOGICAL_MAXIMUM (1) */
+	0x95, 0x03,				/* REPORT_COUNT (3) */
+	0x75, 0x01,				/* REPORT_SIZE (1) */
+	0xb1, 0x02,				/* Feature (Data,Var,Abs) */
+	0x95, 0x01,				/* REPORT_COUNT (1) */
+	0x75, 0x05,				/* REPORT_SIZE (5) */
+	0x91, 0x01,				/* Output (Cnst,Var,Abs) */
+
+	0xc0,				/* END_COLLECTION */
+	0xc0,			/* END_COLLECTION */
+};
+
+SEC("?fmod_ret/hid_bpf_rdesc_fixup")
+int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hid_ctx)
+{
+	__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4096 /* size */);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	callback2_check = data[4];
+
+	/* insert rdesc at offset 73 */
+	__builtin_memcpy(&data[73], rdesc, sizeof(rdesc));
+
+	/* Change Usage Vendor globally */
+	data[4] = 0x42;
+
+	return sizeof(rdesc) + 73;
+}

From 80e189f2af37d383b4840f3f89896071392cb58f Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:53 +0100
Subject: [PATCH 11/33] selftests/hid: Add a test for BPF_F_INSERT_HEAD

Insert 3 programs to check that we are doing the correct thing:
'2', '1', '3' are inserted, but '1' is supposed to be executed first.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 tools/testing/selftests/hid/hid_bpf.c   | 43 +++++++++++++++++++
 tools/testing/selftests/hid/progs/hid.c | 55 ++++++++++++++++++++++++-
 2 files changed, 97 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index eb329b5d299f..6615c26fb5dd 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -88,6 +88,7 @@ struct attach_prog_args {
 	int prog_fd;
 	unsigned int hid;
 	int retval;
+	int insert_head;
 };
 
 struct hid_hw_request_syscall_args {
@@ -490,6 +491,7 @@ FIXTURE_SETUP(hid_bpf)
 
 struct test_program {
 	const char *name;
+	int insert_head;
 };
 #define LOAD_PROGRAMS(progs) \
 	load_programs(progs, ARRAY_SIZE(progs), _metadata, self, variant)
@@ -539,6 +541,7 @@ static void load_programs(const struct test_program programs[],
 
 		args.prog_fd = bpf_program__fd(prog);
 		args.hid = self->hid_id;
+		args.insert_head = programs[i].insert_head;
 		err = bpf_prog_test_run_opts(attach_fd, &tattr);
 		ASSERT_OK(args.retval) TH_LOG("attach_hid(%s): %d", programs[i].name, args.retval);
 	}
@@ -740,6 +743,46 @@ TEST_F(hid_bpf, test_hid_user_raw_request_call)
 	ASSERT_EQ(args.data[1], 2);
 }
 
+/*
+ * Attach hid_insert{0,1,2} to the given uhid device,
+ * retrieve and open the matching hidraw node,
+ * inject one event in the uhid device,
+ * check that the programs have been inserted in the correct order.
+ */
+TEST_F(hid_bpf, test_hid_attach_flags)
+{
+	const struct test_program progs[] = {
+		{
+			.name = "hid_test_insert2",
+			.insert_head = 0,
+		},
+		{
+			.name = "hid_test_insert1",
+			.insert_head = 1,
+		},
+		{
+			.name = "hid_test_insert3",
+			.insert_head = 0,
+		},
+	};
+	__u8 buf[10] = {0};
+	int err;
+
+	LOAD_PROGRAMS(progs);
+
+	/* inject one event */
+	buf[0] = 1;
+	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+
+	/* read the data from hidraw */
+	memset(buf, 0, sizeof(buf));
+	err = read(self->hidraw_fd, buf, sizeof(buf));
+	ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
+	ASSERT_EQ(buf[1], 1);
+	ASSERT_EQ(buf[2], 2);
+	ASSERT_EQ(buf[3], 3);
+}
+
 /*
  * Attach hid_rdesc_fixup to the given uhid device,
  * retrieve and open the matching hidraw node,
diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c
index 5758366a90e6..6a86af0aa545 100644
--- a/tools/testing/selftests/hid/progs/hid.c
+++ b/tools/testing/selftests/hid/progs/hid.c
@@ -11,6 +11,7 @@ struct attach_prog_args {
 	int prog_fd;
 	unsigned int hid;
 	int retval;
+	int insert_head;
 };
 
 __u64 callback_check = 52;
@@ -49,7 +50,8 @@ int attach_prog(struct attach_prog_args *ctx)
 {
 	ctx->retval = hid_bpf_attach_prog(ctx->hid,
 					  ctx->prog_fd,
-					  0);
+					  ctx->insert_head ? HID_BPF_FLAG_INSERT_HEAD :
+							     HID_BPF_FLAG_NONE);
 	return 0;
 }
 
@@ -141,3 +143,54 @@ int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hid_ctx)
 
 	return sizeof(rdesc) + 73;
 }
+
+SEC("?fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_test_insert1, struct hid_bpf_ctx *hid_ctx)
+{
+	__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	/* we need to be run first */
+	if (data[2] || data[3])
+		return -1;
+
+	data[1] = 1;
+
+	return 0;
+}
+
+SEC("?fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_test_insert2, struct hid_bpf_ctx *hid_ctx)
+{
+	__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	/* after insert0 and before insert2 */
+	if (!data[1] || data[3])
+		return -1;
+
+	data[2] = 2;
+
+	return 0;
+}
+
+SEC("?fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_test_insert3, struct hid_bpf_ctx *hid_ctx)
+{
+	__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	/* at the end */
+	if (!data[1] || !data[2])
+		return -1;
+
+	data[3] = 3;
+
+	return 0;
+}

From 6008105b4f4e470da0e9159a3a74ca7ff6e869ba Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:54 +0100
Subject: [PATCH 12/33] samples/hid: add new hid BPF example

Everything should be available in the selftest part of the tree, but
providing an example without uhid and hidraw will be more easy to
follow for users.

This example will probably ever only work on the Etekcity Scroll 6E
because we need to adapt the various raw values to the actual device.

On that device, the X and Y axis will be swapped and inverted, and on
any other device, chances are high that the device will not work until
Ctrl-C is hit.

The Makefiles are taken from samples/bpf to not reinvent the wheel and
to force using in-kernel libbpf and bpftool.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 MAINTAINERS                      |   1 +
 samples/hid/.gitignore           |   7 +
 samples/hid/Makefile             | 246 +++++++++++++++++++++++++++++++
 samples/hid/Makefile.target      |  75 ++++++++++
 samples/hid/hid_bpf_attach.bpf.c |  18 +++
 samples/hid/hid_bpf_attach.h     |  14 ++
 samples/hid/hid_bpf_helpers.h    |  19 +++
 samples/hid/hid_mouse.bpf.c      | 112 ++++++++++++++
 samples/hid/hid_mouse.c          | 155 +++++++++++++++++++
 9 files changed, 647 insertions(+)
 create mode 100644 samples/hid/.gitignore
 create mode 100644 samples/hid/Makefile
 create mode 100644 samples/hid/Makefile.target
 create mode 100644 samples/hid/hid_bpf_attach.bpf.c
 create mode 100644 samples/hid/hid_bpf_attach.h
 create mode 100644 samples/hid/hid_bpf_helpers.h
 create mode 100644 samples/hid/hid_mouse.bpf.c
 create mode 100644 samples/hid/hid_mouse.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 81eb9abbc17a..76d8185c408e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9100,6 +9100,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git
 F:	drivers/hid/
 F:	include/linux/hid*
 F:	include/uapi/linux/hid*
+F:	samples/hid/
 F:	tools/testing/selftests/hid/
 
 HID LOGITECH DRIVERS
diff --git a/samples/hid/.gitignore b/samples/hid/.gitignore
new file mode 100644
index 000000000000..8cb45592e29a
--- /dev/null
+++ b/samples/hid/.gitignore
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
+hid_mouse
+*.out
+*.skel.h
+/vmlinux.h
+/bpftool/
+/libbpf/
diff --git a/samples/hid/Makefile b/samples/hid/Makefile
new file mode 100644
index 000000000000..8fe6ccfc5f29
--- /dev/null
+++ b/samples/hid/Makefile
@@ -0,0 +1,246 @@
+# SPDX-License-Identifier: GPL-2.0
+
+HID_SAMPLES_PATH ?= $(abspath $(srctree)/$(src))
+TOOLS_PATH := $(HID_SAMPLES_PATH)/../../tools
+
+pound := \#
+
+# List of programs to build
+tprogs-y += hid_mouse
+
+# Libbpf dependencies
+LIBBPF_SRC = $(TOOLS_PATH)/lib/bpf
+LIBBPF_OUTPUT = $(abspath $(HID_SAMPLES_PATH))/libbpf
+LIBBPF_DESTDIR = $(LIBBPF_OUTPUT)
+LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include
+LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a
+
+EXTRA_HEADERS := hid_bpf_attach.h
+EXTRA_BPF_HEADERS := hid_bpf_helpers.h
+
+hid_mouse-objs := hid_mouse.o
+
+# Tell kbuild to always build the programs
+always-y := $(tprogs-y)
+
+ifeq ($(ARCH), arm)
+# Strip all except -D__LINUX_ARM_ARCH__ option needed to handle linux
+# headers when arm instruction set identification is requested.
+ARM_ARCH_SELECTOR := $(filter -D__LINUX_ARM_ARCH__%, $(KBUILD_CFLAGS))
+BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR)
+TPROGS_CFLAGS += $(ARM_ARCH_SELECTOR)
+endif
+
+ifeq ($(ARCH), mips)
+TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__
+ifdef CONFIG_MACH_LOONGSON64
+BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-loongson64
+BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-generic
+endif
+endif
+
+TPROGS_CFLAGS += -Wall -O2
+TPROGS_CFLAGS += -Wmissing-prototypes
+TPROGS_CFLAGS += -Wstrict-prototypes
+
+TPROGS_CFLAGS += -I$(objtree)/usr/include
+TPROGS_CFLAGS += -I$(LIBBPF_INCLUDE)
+TPROGS_CFLAGS += -I$(srctree)/tools/include
+
+ifdef SYSROOT
+TPROGS_CFLAGS += --sysroot=$(SYSROOT)
+TPROGS_LDFLAGS := -L$(SYSROOT)/usr/lib
+endif
+
+TPROGS_LDLIBS			+= $(LIBBPF) -lelf -lz
+
+# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
+# make M=samples/bpf LLC=~/git/llvm-project/llvm/build/bin/llc CLANG=~/git/llvm-project/llvm/build/bin/clang
+LLC ?= llc
+CLANG ?= clang
+OPT ?= opt
+LLVM_DIS ?= llvm-dis
+LLVM_OBJCOPY ?= llvm-objcopy
+LLVM_READELF ?= llvm-readelf
+BTF_PAHOLE ?= pahole
+
+# Detect that we're cross compiling and use the cross compiler
+ifdef CROSS_COMPILE
+CLANG_ARCH_ARGS = --target=$(notdir $(CROSS_COMPILE:%-=%))
+endif
+
+# Don't evaluate probes and warnings if we need to run make recursively
+ifneq ($(src),)
+HDR_PROBE := $(shell printf "$(pound)include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" | \
+	$(CC) $(TPROGS_CFLAGS) $(TPROGS_LDFLAGS) -x c - \
+	-o /dev/null 2>/dev/null && echo okay)
+
+ifeq ($(HDR_PROBE),)
+$(warning WARNING: Detected possible issues with include path.)
+$(warning WARNING: Please install kernel headers locally (make headers_install).)
+endif
+
+BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
+BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
+BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')
+BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \
+			  $(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \
+			  $(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \
+			  /bin/rm -f ./llvm_btf_verify.o)
+
+BPF_EXTRA_CFLAGS += -fno-stack-protector
+ifneq ($(BTF_LLVM_PROBE),)
+	BPF_EXTRA_CFLAGS += -g
+else
+ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),)
+	BPF_EXTRA_CFLAGS += -g
+	LLC_FLAGS += -mattr=dwarfris
+	DWARF2BTF = y
+endif
+endif
+endif
+
+# Trick to allow make to be run from this directory
+all:
+	$(MAKE) -C ../../ M=$(CURDIR) HID_SAMPLES_PATH=$(CURDIR)
+
+clean:
+	$(MAKE) -C ../../ M=$(CURDIR) clean
+	@find $(CURDIR) -type f -name '*~' -delete
+	@$(RM) -r $(CURDIR)/libbpf $(CURDIR)/bpftool
+
+$(LIBBPF): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)
+# Fix up variables inherited from Kbuild that tools/ build system won't like
+	$(MAKE) -C $(LIBBPF_SRC) RM='rm -rf' EXTRA_CFLAGS="$(TPROGS_CFLAGS)" \
+		LDFLAGS=$(TPROGS_LDFLAGS) srctree=$(HID_SAMPLES_PATH)/../../ \
+		O= OUTPUT=$(LIBBPF_OUTPUT)/ DESTDIR=$(LIBBPF_DESTDIR) prefix= \
+		$@ install_headers
+
+BPFTOOLDIR := $(TOOLS_PATH)/bpf/bpftool
+BPFTOOL_OUTPUT := $(abspath $(HID_SAMPLES_PATH))/bpftool
+BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
+$(BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) | $(BPFTOOL_OUTPUT)
+	$(MAKE) -C $(BPFTOOLDIR) srctree=$(HID_SAMPLES_PATH)/../../ 		\
+		OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
+
+$(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
+	$(call msg,MKDIR,$@)
+	$(Q)mkdir -p $@
+
+FORCE:
+
+
+# Verify LLVM compiler tools are available and bpf target is supported by llc
+.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)
+
+verify_cmds: $(CLANG) $(LLC)
+	@for TOOL in $^ ; do \
+		if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \
+			echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\
+			exit 1; \
+		else true; fi; \
+	done
+
+verify_target_bpf: verify_cmds
+	@if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \
+		echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\
+		echo "   NOTICE: LLVM version >= 3.7.1 required" ;\
+		exit 2; \
+	else true; fi
+
+$(HID_SAMPLES_PATH)/*.c: verify_target_bpf $(LIBBPF)
+$(src)/*.c: verify_target_bpf $(LIBBPF)
+
+libbpf_hdrs: $(LIBBPF)
+
+.PHONY: libbpf_hdrs
+
+$(obj)/hid_mouse.o: $(obj)/hid_mouse.skel.h
+
+-include $(HID_SAMPLES_PATH)/Makefile.target
+
+VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/vmlinux))				\
+		     $(abspath $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux))	\
+		     $(abspath ./vmlinux)
+VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
+
+$(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL)
+ifeq ($(VMLINUX_H),)
+ifeq ($(VMLINUX_BTF),)
+	$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)",\
+		build the kernel or set VMLINUX_BTF or VMLINUX_H variable)
+endif
+	$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
+else
+	$(Q)cp "$(VMLINUX_H)" $@
+endif
+
+clean-files += vmlinux.h
+
+# Get Clang's default includes on this system, as opposed to those seen by
+# '-target bpf'. This fixes "missing" files on some architectures/distros,
+# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
+#
+# Use '-idirafter': Don't interfere with include mechanics except where the
+# build would have failed anyways.
+define get_sys_includes
+$(shell $(1) -v -E - </dev/null 2>&1 \
+        | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
+$(shell $(1) -dM -E - </dev/null | grep '#define __riscv_xlen ' | sed 's/#define /-D/' | sed 's/ /=/')
+endef
+
+CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
+
+EXTRA_BPF_HEADERS_SRC := $(addprefix $(src)/,$(EXTRA_BPF_HEADERS))
+
+$(obj)/%.bpf.o: $(src)/%.bpf.c $(EXTRA_BPF_HEADERS_SRC) $(obj)/vmlinux.h
+	@echo "  CLANG-BPF " $@
+	$(Q)$(CLANG) -g -O2 -target bpf -D__TARGET_ARCH_$(SRCARCH) \
+		-Wno-compare-distinct-pointer-types -I$(srctree)/include \
+		-I$(srctree)/samples/bpf -I$(srctree)/tools/include \
+		-I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \
+		-c $(filter %.bpf.c,$^) -o $@
+
+LINKED_SKELS := hid_mouse.skel.h
+clean-files += $(LINKED_SKELS)
+
+hid_mouse.skel.h-deps := hid_mouse.bpf.o hid_bpf_attach.bpf.o
+
+LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
+
+BPF_SRCS_LINKED := $(notdir $(wildcard $(src)/*.bpf.c))
+BPF_OBJS_LINKED := $(patsubst %.bpf.c,$(obj)/%.bpf.o, $(BPF_SRCS_LINKED))
+BPF_SKELS_LINKED := $(addprefix $(obj)/,$(LINKED_SKELS))
+
+$(BPF_SKELS_LINKED): $(BPF_OBJS_LINKED) $(BPFTOOL)
+	@echo "  BPF GEN-OBJ " $(@:.skel.h=)
+	$(Q)$(BPFTOOL) gen object $(@:.skel.h=.lbpf.o) $(addprefix $(obj)/,$($(@F)-deps))
+	@echo "  BPF GEN-SKEL" $(@:.skel.h=)
+	$(Q)$(BPFTOOL) gen skeleton $(@:.skel.h=.lbpf.o) name $(notdir $(@:.skel.h=)) > $@
+
+# asm/sysreg.h - inline assembly used by it is incompatible with llvm.
+# But, there is no easy way to fix it, so just exclude it since it is
+# useless for BPF samples.
+# below we use long chain of commands, clang | opt | llvm-dis | llc,
+# to generate final object file. 'clang' compiles the source into IR
+# with native target, e.g., x64, arm64, etc. 'opt' does bpf CORE IR builtin
+# processing (llvm12) and IR optimizations. 'llvm-dis' converts
+# 'opt' output to IR, and finally 'llc' generates bpf byte code.
+$(obj)/%.o: $(src)/%.c
+	@echo "  CLANG-bpf " $@
+	$(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(BPF_EXTRA_CFLAGS) \
+		-I$(obj) -I$(srctree)/tools/testing/selftests/bpf/ \
+		-I$(LIBBPF_INCLUDE) \
+		-D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign \
+		-D__TARGET_ARCH_$(SRCARCH) -Wno-compare-distinct-pointer-types \
+		-Wno-gnu-variable-sized-type-not-at-end \
+		-Wno-address-of-packed-member -Wno-tautological-compare \
+		-Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \
+		-fno-asynchronous-unwind-tables \
+		-I$(srctree)/samples/hid/ \
+		-O2 -emit-llvm -Xclang -disable-llvm-passes -c $< -o - | \
+		$(OPT) -O2 -mtriple=bpf-pc-linux | $(LLVM_DIS) | \
+		$(LLC) -march=bpf $(LLC_FLAGS) -filetype=obj -o $@
+ifeq ($(DWARF2BTF),y)
+	$(BTF_PAHOLE) -J $@
+endif
diff --git a/samples/hid/Makefile.target b/samples/hid/Makefile.target
new file mode 100644
index 000000000000..7621f55e2947
--- /dev/null
+++ b/samples/hid/Makefile.target
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: GPL-2.0
+# ==========================================================================
+# Building binaries on the host system
+# Binaries are not used during the compilation of the kernel, and intended
+# to be build for target board, target board can be host of course. Added to
+# build binaries to run not on host system.
+#
+# Sample syntax
+# tprogs-y := xsk_example
+# Will compile xsk_example.c and create an executable named xsk_example
+#
+# tprogs-y    := xdpsock
+# xdpsock-objs := xdpsock_1.o xdpsock_2.o
+# Will compile xdpsock_1.c and xdpsock_2.c, and then link the executable
+# xdpsock, based on xdpsock_1.o and xdpsock_2.o
+#
+# Derived from scripts/Makefile.host
+#
+__tprogs := $(sort $(tprogs-y))
+
+# C code
+# Executables compiled from a single .c file
+tprog-csingle	:= $(foreach m,$(__tprogs), \
+			$(if $($(m)-objs),,$(m)))
+
+# C executables linked based on several .o files
+tprog-cmulti	:= $(foreach m,$(__tprogs),\
+			$(if $($(m)-objs),$(m)))
+
+# Object (.o) files compiled from .c files
+tprog-cobjs	:= $(sort $(foreach m,$(__tprogs),$($(m)-objs)))
+
+tprog-csingle	:= $(addprefix $(obj)/,$(tprog-csingle))
+tprog-cmulti	:= $(addprefix $(obj)/,$(tprog-cmulti))
+tprog-cobjs	:= $(addprefix $(obj)/,$(tprog-cobjs))
+
+#####
+# Handle options to gcc. Support building with separate output directory
+
+_tprogc_flags   = $(TPROGS_CFLAGS) \
+                 $(TPROGCFLAGS_$(basetarget).o)
+
+# $(objtree)/$(obj) for including generated headers from checkin source files
+ifeq ($(KBUILD_EXTMOD),)
+ifdef building_out_of_srctree
+_tprogc_flags   += -I $(objtree)/$(obj)
+endif
+endif
+
+tprogc_flags    = -Wp,-MD,$(depfile) $(_tprogc_flags)
+
+# Create executable from a single .c file
+# tprog-csingle -> Executable
+quiet_cmd_tprog-csingle 	= CC  $@
+      cmd_tprog-csingle	= $(CC) $(tprogc_flags) $(TPROGS_LDFLAGS) -o $@ $< \
+		$(TPROGS_LDLIBS) $(TPROGLDLIBS_$(@F))
+$(tprog-csingle): $(obj)/%: $(src)/%.c FORCE
+	$(call if_changed_dep,tprog-csingle)
+
+# Link an executable based on list of .o files, all plain c
+# tprog-cmulti -> executable
+quiet_cmd_tprog-cmulti	= LD  $@
+      cmd_tprog-cmulti	= $(CC) $(tprogc_flags) $(TPROGS_LDFLAGS) -o $@ \
+			  $(addprefix $(obj)/,$($(@F)-objs)) \
+			  $(TPROGS_LDLIBS) $(TPROGLDLIBS_$(@F))
+$(tprog-cmulti): $(tprog-cobjs) FORCE
+	$(call if_changed,tprog-cmulti)
+$(call multi_depend, $(tprog-cmulti), , -objs)
+
+# Create .o file from a single .c file
+# tprog-cobjs -> .o
+quiet_cmd_tprog-cobjs	= CC  $@
+      cmd_tprog-cobjs	= $(CC) $(tprogc_flags) -c -o $@ $<
+$(tprog-cobjs): $(obj)/%.o: $(src)/%.c FORCE
+	$(call if_changed_dep,tprog-cobjs)
diff --git a/samples/hid/hid_bpf_attach.bpf.c b/samples/hid/hid_bpf_attach.bpf.c
new file mode 100644
index 000000000000..d4dce4ea7c6e
--- /dev/null
+++ b/samples/hid/hid_bpf_attach.bpf.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include "hid_bpf_attach.h"
+#include "hid_bpf_helpers.h"
+
+SEC("syscall")
+int attach_prog(struct attach_prog_args *ctx)
+{
+	ctx->retval = hid_bpf_attach_prog(ctx->hid,
+					  ctx->prog_fd,
+					  0);
+	return 0;
+}
diff --git a/samples/hid/hid_bpf_attach.h b/samples/hid/hid_bpf_attach.h
new file mode 100644
index 000000000000..35bb28b49264
--- /dev/null
+++ b/samples/hid/hid_bpf_attach.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#ifndef __HID_BPF_ATTACH_H
+#define __HID_BPF_ATTACH_H
+
+struct attach_prog_args {
+	int prog_fd;
+	unsigned int hid;
+	int retval;
+};
+
+#endif /* __HID_BPF_ATTACH_H */
diff --git a/samples/hid/hid_bpf_helpers.h b/samples/hid/hid_bpf_helpers.h
new file mode 100644
index 000000000000..c555aeef5e37
--- /dev/null
+++ b/samples/hid/hid_bpf_helpers.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#ifndef __HID_BPF_HELPERS_H
+#define __HID_BPF_HELPERS_H
+
+/* following are kfuncs exported by HID for HID-BPF */
+extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx,
+			      unsigned int offset,
+			      const size_t __sz) __ksym;
+extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym;
+extern int hid_bpf_hw_request(struct hid_bpf_ctx *ctx,
+			      __u8 *data,
+			      size_t buf__sz,
+			      enum hid_report_type type,
+			      enum hid_class_request reqtype) __ksym;
+
+#endif /* __HID_BPF_HELPERS_H */
diff --git a/samples/hid/hid_mouse.bpf.c b/samples/hid/hid_mouse.bpf.c
new file mode 100644
index 000000000000..7c8b453ccb16
--- /dev/null
+++ b/samples/hid/hid_mouse.bpf.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include "hid_bpf_helpers.h"
+
+SEC("fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_y_event, struct hid_bpf_ctx *hctx)
+{
+	s16 y;
+	__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	bpf_printk("event: size: %d", hctx->size);
+	bpf_printk("incoming event: %02x %02x %02x",
+		   data[0],
+		   data[1],
+		   data[2]);
+	bpf_printk("                %02x %02x %02x",
+		   data[3],
+		   data[4],
+		   data[5]);
+	bpf_printk("                %02x %02x %02x",
+		   data[6],
+		   data[7],
+		   data[8]);
+
+	y = data[3] | (data[4] << 8);
+
+	y = -y;
+
+	data[3] = y & 0xFF;
+	data[4] = (y >> 8) & 0xFF;
+
+	bpf_printk("modified event: %02x %02x %02x",
+		   data[0],
+		   data[1],
+		   data[2]);
+	bpf_printk("                %02x %02x %02x",
+		   data[3],
+		   data[4],
+		   data[5]);
+	bpf_printk("                %02x %02x %02x",
+		   data[6],
+		   data[7],
+		   data[8]);
+
+	return 0;
+}
+
+SEC("fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_x_event, struct hid_bpf_ctx *hctx)
+{
+	s16 x;
+	__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	x = data[1] | (data[2] << 8);
+
+	x = -x;
+
+	data[1] = x & 0xFF;
+	data[2] = (x >> 8) & 0xFF;
+	return 0;
+}
+
+SEC("fmod_ret/hid_bpf_rdesc_fixup")
+int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx)
+{
+	__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	bpf_printk("rdesc: %02x %02x %02x",
+		   data[0],
+		   data[1],
+		   data[2]);
+	bpf_printk("       %02x %02x %02x",
+		   data[3],
+		   data[4],
+		   data[5]);
+	bpf_printk("       %02x %02x %02x ...",
+		   data[6],
+		   data[7],
+		   data[8]);
+
+	/*
+	 * The original report descriptor contains:
+	 *
+	 * 0x05, 0x01,                    //   Usage Page (Generic Desktop)      30
+	 * 0x16, 0x01, 0x80,              //   Logical Minimum (-32767)          32
+	 * 0x26, 0xff, 0x7f,              //   Logical Maximum (32767)           35
+	 * 0x09, 0x30,                    //   Usage (X)                         38
+	 * 0x09, 0x31,                    //   Usage (Y)                         40
+	 *
+	 * So byte 39 contains Usage X and byte 41 Usage Y.
+	 *
+	 * We simply swap the axes here.
+	 */
+	data[39] = 0x31;
+	data[41] = 0x30;
+
+	return 0;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/samples/hid/hid_mouse.c b/samples/hid/hid_mouse.c
new file mode 100644
index 000000000000..018f1185f203
--- /dev/null
+++ b/samples/hid/hid_mouse.c
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2022 Benjamin Tissoires
+ *
+ * This is a pure HID-BPF example, and should be considered as such:
+ * on the Etekcity Scroll 6E, the X and Y axes will be swapped and
+ * inverted. On any other device... Not sure what this will do.
+ *
+ * This C main file is generic though. To adapt the code and test, users
+ * must amend only the .bpf.c file, which this program will load any
+ * eBPF program it finds.
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/resource.h>
+#include <unistd.h>
+
+#include <linux/bpf.h>
+#include <linux/errno.h>
+
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+
+#include "hid_mouse.skel.h"
+#include "hid_bpf_attach.h"
+
+static bool running = true;
+
+static void int_exit(int sig)
+{
+	running = false;
+	exit(0);
+}
+
+static void usage(const char *prog)
+{
+	fprintf(stderr,
+		"%s: %s /sys/bus/hid/devices/0BUS:0VID:0PID:00ID\n\n",
+		__func__, prog);
+	fprintf(stderr,
+		"This program will upload and attach a HID-BPF program to the given device.\n"
+		"On the Etekcity Scroll 6E, the X and Y axis will be inverted, but on any other\n"
+		"device, chances are high that the device will not be working anymore\n\n"
+		"consider this as a demo and adapt the eBPF program to your needs\n"
+		"Hit Ctrl-C to unbind the program and reset the device\n");
+}
+
+static int get_hid_id(const char *path)
+{
+	const char *str_id, *dir;
+	char uevent[1024];
+	int fd;
+
+	memset(uevent, 0, sizeof(uevent));
+	snprintf(uevent, sizeof(uevent) - 1, "%s/uevent", path);
+
+	fd = open(uevent, O_RDONLY | O_NONBLOCK);
+	if (fd < 0)
+		return -ENOENT;
+
+	close(fd);
+
+	dir = basename((char *)path);
+
+	str_id = dir + sizeof("0003:0001:0A37.");
+	return (int)strtol(str_id, NULL, 16);
+}
+
+int main(int argc, char **argv)
+{
+	struct hid_mouse *skel;
+	struct bpf_program *prog;
+	int err;
+	const char *optstr = "";
+	const char *sysfs_path;
+	int opt, hid_id, attach_fd;
+	struct attach_prog_args args = {
+		.retval = -1,
+	};
+	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
+			    .ctx_in = &args,
+			    .ctx_size_in = sizeof(args),
+	);
+
+	while ((opt = getopt(argc, argv, optstr)) != -1) {
+		switch (opt) {
+		default:
+			usage(basename(argv[0]));
+			return 1;
+		}
+	}
+
+	if (optind == argc) {
+		usage(basename(argv[0]));
+		return 1;
+	}
+
+	sysfs_path = argv[optind];
+	if (!sysfs_path) {
+		perror("sysfs");
+		return 1;
+	}
+
+	skel = hid_mouse__open_and_load();
+	if (!skel) {
+		fprintf(stderr, "%s  %s:%d", __func__, __FILE__, __LINE__);
+		return -1;
+	}
+
+	hid_id = get_hid_id(sysfs_path);
+
+	if (hid_id < 0) {
+		fprintf(stderr, "can not open HID device: %m\n");
+		return 1;
+	}
+	args.hid = hid_id;
+
+	attach_fd = bpf_program__fd(skel->progs.attach_prog);
+	if (attach_fd < 0) {
+		fprintf(stderr, "can't locate attach prog: %m\n");
+		return 1;
+	}
+
+	bpf_object__for_each_program(prog, *skel->skeleton->obj) {
+		/* ignore syscalls */
+		if (bpf_program__get_type(prog) != BPF_PROG_TYPE_TRACING)
+			continue;
+
+		args.retval = -1;
+		args.prog_fd = bpf_program__fd(prog);
+		err = bpf_prog_test_run_opts(attach_fd, &tattr);
+		if (err) {
+			fprintf(stderr, "can't attach prog to hid device %d: %m (err: %d)\n",
+				hid_id, err);
+			return 1;
+		}
+	}
+
+	signal(SIGINT, int_exit);
+	signal(SIGTERM, int_exit);
+
+	while (running)
+		sleep(1);
+
+	hid_mouse__destroy(skel);
+
+	return 0;
+}

From a56a256933bb0b593dc36fc8d7bb85ada3655662 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:55 +0100
Subject: [PATCH 13/33] samples/hid: add Surface Dial example

Add a more complete HID-BPF example.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 samples/hid/.gitignore             |   1 +
 samples/hid/Makefile               |   6 +-
 samples/hid/hid_bpf_helpers.h      |   2 +
 samples/hid/hid_surface_dial.bpf.c | 134 +++++++++++++++++
 samples/hid/hid_surface_dial.c     | 226 +++++++++++++++++++++++++++++
 5 files changed, 368 insertions(+), 1 deletion(-)
 create mode 100644 samples/hid/hid_surface_dial.bpf.c
 create mode 100644 samples/hid/hid_surface_dial.c

diff --git a/samples/hid/.gitignore b/samples/hid/.gitignore
index 8cb45592e29a..3ea0fed3bbad 100644
--- a/samples/hid/.gitignore
+++ b/samples/hid/.gitignore
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
 hid_mouse
+hid_surface_dial
 *.out
 *.skel.h
 /vmlinux.h
diff --git a/samples/hid/Makefile b/samples/hid/Makefile
index 8fe6ccfc5f29..026288280a03 100644
--- a/samples/hid/Makefile
+++ b/samples/hid/Makefile
@@ -7,6 +7,7 @@ pound := \#
 
 # List of programs to build
 tprogs-y += hid_mouse
+tprogs-y += hid_surface_dial
 
 # Libbpf dependencies
 LIBBPF_SRC = $(TOOLS_PATH)/lib/bpf
@@ -19,6 +20,7 @@ EXTRA_HEADERS := hid_bpf_attach.h
 EXTRA_BPF_HEADERS := hid_bpf_helpers.h
 
 hid_mouse-objs := hid_mouse.o
+hid_surface_dial-objs := hid_surface_dial.o
 
 # Tell kbuild to always build the programs
 always-y := $(tprogs-y)
@@ -156,6 +158,7 @@ libbpf_hdrs: $(LIBBPF)
 .PHONY: libbpf_hdrs
 
 $(obj)/hid_mouse.o: $(obj)/hid_mouse.skel.h
+$(obj)/hid_surface_dial.o: $(obj)/hid_surface_dial.skel.h
 
 -include $(HID_SAMPLES_PATH)/Makefile.target
 
@@ -201,10 +204,11 @@ $(obj)/%.bpf.o: $(src)/%.bpf.c $(EXTRA_BPF_HEADERS_SRC) $(obj)/vmlinux.h
 		-I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \
 		-c $(filter %.bpf.c,$^) -o $@
 
-LINKED_SKELS := hid_mouse.skel.h
+LINKED_SKELS := hid_mouse.skel.h hid_surface_dial.skel.h
 clean-files += $(LINKED_SKELS)
 
 hid_mouse.skel.h-deps := hid_mouse.bpf.o hid_bpf_attach.bpf.o
+hid_surface_dial.skel.h-deps := hid_surface_dial.bpf.o hid_bpf_attach.bpf.o
 
 LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
 
diff --git a/samples/hid/hid_bpf_helpers.h b/samples/hid/hid_bpf_helpers.h
index c555aeef5e37..4fff31dbe0e7 100644
--- a/samples/hid/hid_bpf_helpers.h
+++ b/samples/hid/hid_bpf_helpers.h
@@ -10,6 +10,8 @@ extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx,
 			      unsigned int offset,
 			      const size_t __sz) __ksym;
 extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym;
+extern struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id) __ksym;
+extern void hid_bpf_release_context(struct hid_bpf_ctx *ctx) __ksym;
 extern int hid_bpf_hw_request(struct hid_bpf_ctx *ctx,
 			      __u8 *data,
 			      size_t buf__sz,
diff --git a/samples/hid/hid_surface_dial.bpf.c b/samples/hid/hid_surface_dial.bpf.c
new file mode 100644
index 000000000000..1f80478c0918
--- /dev/null
+++ b/samples/hid/hid_surface_dial.bpf.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include "hid_bpf_helpers.h"
+
+#define HID_UP_BUTTON		0x0009
+#define HID_GD_WHEEL		0x0038
+
+SEC("fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_event, struct hid_bpf_ctx *hctx)
+{
+	__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	/* Touch */
+	data[1] &= 0xfd;
+
+	/* X */
+	data[4] = 0;
+	data[5] = 0;
+
+	/* Y */
+	data[6] = 0;
+	data[7] = 0;
+
+	return 0;
+}
+
+/* 72 == 360 / 5 -> 1 report every 5 degrees */
+int resolution = 72;
+int physical = 5;
+
+struct haptic_syscall_args {
+	unsigned int hid;
+	int retval;
+};
+
+static __u8 haptic_data[8];
+
+SEC("syscall")
+int set_haptic(struct haptic_syscall_args *args)
+{
+	struct hid_bpf_ctx *ctx;
+	const size_t size = sizeof(haptic_data);
+	u16 *res;
+	int ret;
+
+	if (size > sizeof(haptic_data))
+		return -7; /* -E2BIG */
+
+	ctx = hid_bpf_allocate_context(args->hid);
+	if (!ctx)
+		return -1; /* EPERM check */
+
+	haptic_data[0] = 1;  /* report ID */
+
+	ret = hid_bpf_hw_request(ctx, haptic_data, size, HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
+
+	bpf_printk("probed/remove event ret value: %d", ret);
+	bpf_printk("buf: %02x %02x %02x",
+		   haptic_data[0],
+		   haptic_data[1],
+		   haptic_data[2]);
+	bpf_printk("     %02x %02x %02x",
+		   haptic_data[3],
+		   haptic_data[4],
+		   haptic_data[5]);
+	bpf_printk("     %02x %02x",
+		   haptic_data[6],
+		   haptic_data[7]);
+
+	/* whenever resolution multiplier is not 3600, we have the fixed report descriptor */
+	res = (u16 *)&haptic_data[1];
+	if (*res != 3600) {
+//		haptic_data[1] = 72; /* resolution multiplier */
+//		haptic_data[2] = 0;  /* resolution multiplier */
+//		haptic_data[3] = 0;  /* Repeat Count */
+		haptic_data[4] = 3;  /* haptic Auto Trigger */
+//		haptic_data[5] = 5;  /* Waveform Cutoff Time */
+//		haptic_data[6] = 80; /* Retrigger Period */
+//		haptic_data[7] = 0;  /* Retrigger Period */
+	} else {
+		haptic_data[4] = 0;
+	}
+
+	ret = hid_bpf_hw_request(ctx, haptic_data, size, HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+
+	bpf_printk("set haptic ret value: %d -> %d", ret, haptic_data[4]);
+
+	args->retval = ret;
+
+	hid_bpf_release_context(ctx);
+
+	return 0;
+}
+
+/* Convert REL_DIAL into REL_WHEEL */
+SEC("fmod_ret/hid_bpf_rdesc_fixup")
+int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx)
+{
+	__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
+	__u16 *res, *phys;
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	/* Convert TOUCH into a button */
+	data[31] = HID_UP_BUTTON;
+	data[33] = 2;
+
+	/* Convert REL_DIAL into REL_WHEEL */
+	data[45] = HID_GD_WHEEL;
+
+	/* Change Resolution Multiplier */
+	phys = (__u16 *)&data[61];
+	*phys = physical;
+	res = (__u16 *)&data[66];
+	*res = resolution;
+
+	/* Convert X,Y from Abs to Rel */
+	data[88] = 0x06;
+	data[98] = 0x06;
+
+	return 0;
+}
+
+char _license[] SEC("license") = "GPL";
+u32 _version SEC("version") = 1;
diff --git a/samples/hid/hid_surface_dial.c b/samples/hid/hid_surface_dial.c
new file mode 100644
index 000000000000..bceea53d39b0
--- /dev/null
+++ b/samples/hid/hid_surface_dial.c
@@ -0,0 +1,226 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2022 Benjamin Tissoires
+ *
+ * This program will morph the Microsoft Surface Dial into a mouse,
+ * and depending on the chosen resolution enable or not the haptic feedback:
+ * - a resolution (-r) of 3600 will report 3600 "ticks" in one full rotation
+ *   wihout haptic feedback
+ * - any other resolution will report N "ticks" in a full rotation with haptic
+ *   feedback
+ *
+ * A good default for low resolution haptic scrolling is 72 (1 "tick" every 5
+ * degrees), and set to 3600 for smooth scrolling.
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/resource.h>
+#include <unistd.h>
+
+#include <linux/bpf.h>
+#include <linux/errno.h>
+
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+
+#include "hid_surface_dial.skel.h"
+#include "hid_bpf_attach.h"
+
+static bool running = true;
+
+struct haptic_syscall_args {
+	unsigned int hid;
+	int retval;
+};
+
+static void int_exit(int sig)
+{
+	running = false;
+	exit(0);
+}
+
+static void usage(const char *prog)
+{
+	fprintf(stderr,
+		"%s: %s [OPTIONS] /sys/bus/hid/devices/0BUS:0VID:0PID:00ID\n\n"
+		"  OPTIONS:\n"
+		"    -r N\t set the given resolution to the device (number of ticks per 360°)\n\n",
+		__func__, prog);
+	fprintf(stderr,
+		"This program will morph the Microsoft Surface Dial into a mouse,\n"
+		"and depending on the chosen resolution enable or not the haptic feedback:\n"
+		"- a resolution (-r) of 3600 will report 3600 'ticks' in one full rotation\n"
+		"  wihout haptic feedback\n"
+		"- any other resolution will report N 'ticks' in a full rotation with haptic\n"
+		"  feedback\n"
+		"\n"
+		"A good default for low resolution haptic scrolling is 72 (1 'tick' every 5\n"
+		"degrees), and set to 3600 for smooth scrolling.\n");
+}
+
+static int get_hid_id(const char *path)
+{
+	const char *str_id, *dir;
+	char uevent[1024];
+	int fd;
+
+	memset(uevent, 0, sizeof(uevent));
+	snprintf(uevent, sizeof(uevent) - 1, "%s/uevent", path);
+
+	fd = open(uevent, O_RDONLY | O_NONBLOCK);
+	if (fd < 0)
+		return -ENOENT;
+
+	close(fd);
+
+	dir = basename((char *)path);
+
+	str_id = dir + sizeof("0003:0001:0A37.");
+	return (int)strtol(str_id, NULL, 16);
+}
+
+static int attach_prog(struct hid_surface_dial *skel, struct bpf_program *prog, int hid_id)
+{
+	struct attach_prog_args args = {
+		.hid = hid_id,
+		.retval = -1,
+	};
+	int attach_fd, err;
+	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
+			    .ctx_in = &args,
+			    .ctx_size_in = sizeof(args),
+	);
+
+	attach_fd = bpf_program__fd(skel->progs.attach_prog);
+	if (attach_fd < 0) {
+		fprintf(stderr, "can't locate attach prog: %m\n");
+		return 1;
+	}
+
+	args.prog_fd = bpf_program__fd(prog);
+	err = bpf_prog_test_run_opts(attach_fd, &tattr);
+	if (err) {
+		fprintf(stderr, "can't attach prog to hid device %d: %m (err: %d)\n",
+			hid_id, err);
+		return 1;
+	}
+	return 0;
+}
+
+static int set_haptic(struct hid_surface_dial *skel, int hid_id)
+{
+	struct haptic_syscall_args args = {
+		.hid = hid_id,
+		.retval = -1,
+	};
+	int haptic_fd, err;
+	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
+			    .ctx_in = &args,
+			    .ctx_size_in = sizeof(args),
+	);
+
+	haptic_fd = bpf_program__fd(skel->progs.set_haptic);
+	if (haptic_fd < 0) {
+		fprintf(stderr, "can't locate haptic prog: %m\n");
+		return 1;
+	}
+
+	err = bpf_prog_test_run_opts(haptic_fd, &tattr);
+	if (err) {
+		fprintf(stderr, "can't set haptic configuration to hid device %d: %m (err: %d)\n",
+			hid_id, err);
+		return 1;
+	}
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	struct hid_surface_dial *skel;
+	struct bpf_program *prog;
+	const char *optstr = "r:";
+	const char *sysfs_path;
+	int opt, hid_id, resolution = 72;
+
+	while ((opt = getopt(argc, argv, optstr)) != -1) {
+		switch (opt) {
+		case 'r':
+			{
+				char *endp = NULL;
+				long l = -1;
+
+				if (optarg) {
+					l = strtol(optarg, &endp, 10);
+					if (endp && *endp)
+						l = -1;
+				}
+
+				if (l < 0) {
+					fprintf(stderr,
+						"invalid r option %s - expecting a number\n",
+						optarg ? optarg : "");
+					exit(EXIT_FAILURE);
+				};
+
+				resolution = (int) l;
+				break;
+			}
+		default:
+			usage(basename(argv[0]));
+			return 1;
+		}
+	}
+
+	if (optind == argc) {
+		usage(basename(argv[0]));
+		return 1;
+	}
+
+	sysfs_path = argv[optind];
+	if (!sysfs_path) {
+		perror("sysfs");
+		return 1;
+	}
+
+	skel = hid_surface_dial__open_and_load();
+	if (!skel) {
+		fprintf(stderr, "%s  %s:%d", __func__, __FILE__, __LINE__);
+		return -1;
+	}
+
+	hid_id = get_hid_id(sysfs_path);
+	if (hid_id < 0) {
+		fprintf(stderr, "can not open HID device: %m\n");
+		return 1;
+	}
+
+	skel->data->resolution = resolution;
+	skel->data->physical = (int)(resolution / 72);
+
+	bpf_object__for_each_program(prog, *skel->skeleton->obj) {
+		/* ignore syscalls */
+		if (bpf_program__get_type(prog) != BPF_PROG_TYPE_TRACING)
+			continue;
+
+		attach_prog(skel, prog, hid_id);
+	}
+
+	signal(SIGINT, int_exit);
+	signal(SIGTERM, int_exit);
+
+	set_haptic(skel, hid_id);
+
+	while (running)
+		sleep(1);
+
+	hid_surface_dial__destroy(skel);
+
+	return 0;
+}

From dfae6bec7100ca21a5753a03b09a81174a4e7ba0 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:56 +0100
Subject: [PATCH 14/33] Documentation: add HID-BPF docs

Gives a primer on HID-BPF.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 Documentation/hid/hid-bpf.rst | 512 ++++++++++++++++++++++++++++++++++
 Documentation/hid/index.rst   |   1 +
 MAINTAINERS                   |   1 +
 3 files changed, 514 insertions(+)
 create mode 100644 Documentation/hid/hid-bpf.rst

diff --git a/Documentation/hid/hid-bpf.rst b/Documentation/hid/hid-bpf.rst
new file mode 100644
index 000000000000..a55f191d49a3
--- /dev/null
+++ b/Documentation/hid/hid-bpf.rst
@@ -0,0 +1,512 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=======
+HID-BPF
+=======
+
+HID is a standard protocol for input devices but some devices may require
+custom tweaks, traditionally done with a kernel driver fix. Using the eBPF
+capabilities instead speeds up development and adds new capabilities to the
+existing HID interfaces.
+
+.. contents::
+    :local:
+    :depth: 2
+
+
+When (and why) to use HID-BPF
+=============================
+
+There are several use cases when using HID-BPF is better
+than standard kernel driver fix:
+
+Dead zone of a joystick
+-----------------------
+
+Assuming you have a joystick that is getting older, it is common to see it
+wobbling around its neutral point. This is usually filtered at the application
+level by adding a *dead zone* for this specific axis.
+
+With HID-BPF, we can apply this filtering in the kernel directly so userspace
+does not get woken up when nothing else is happening on the input controller.
+
+Of course, given that this dead zone is specific to an individual device, we
+can not create a generic fix for all of the same joysticks. Adding a custom
+kernel API for this (e.g. by adding a sysfs entry) does not guarantee this new
+kernel API will be broadly adopted and maintained.
+
+HID-BPF allows the userspace program to load the program itself, ensuring we
+only load the custom API when we have a user.
+
+Simple fixup of report descriptor
+---------------------------------
+
+In the HID tree, half of the drivers only fix one key or one byte
+in the report descriptor. These fixes all require a kernel patch and the
+subsequent shepherding into a release, a long and painful process for users.
+
+We can reduce this burden by providing an eBPF program instead. Once such a
+program  has been verified by the user, we can embed the source code into the
+kernel tree and ship the eBPF program and load it directly instead of loading
+a specific kernel module for it.
+
+Note: distribution of eBPF programs and their inclusion in the kernel is not
+yet fully implemented
+
+Add a new feature that requires a new kernel API
+------------------------------------------------
+
+An example for such a feature are the Universal Stylus Interface (USI) pens.
+Basically, USI pens require a new kernel API because there are new
+channels of communication that our HID and input stack do not support.
+Instead of using hidraw or creating new sysfs entries or ioctls, we can rely
+on eBPF to have the kernel API controlled by the consumer and to not
+impact the performances by waking up userspace every time there is an
+event.
+
+Morph a device into something else and control that from userspace
+------------------------------------------------------------------
+
+The kernel has a relatively static mapping of HID items to evdev bits.
+It cannot decide to dynamically transform a given device into something else
+as it does not have the required context and any such transformation cannot be
+undone (or even discovered) by userspace.
+
+However, some devices are useless with that static way of defining devices. For
+example, the Microsoft Surface Dial is a pushbutton with haptic feedback that
+is barely usable as of today.
+
+With eBPF, userspace can morph that device into a mouse, and convert the dial
+events into wheel events. Also, the userspace program can set/unset the haptic
+feedback depending on the context. For example, if a menu is visible on the
+screen we likely need to have a haptic click every 15 degrees. But when
+scrolling in a web page the user experience is better when the device emits
+events at the highest resolution.
+
+Firewall
+--------
+
+What if we want to prevent other users to access a specific feature of a
+device? (think a possibly broken firmware update entry point)
+
+With eBPF, we can intercept any HID command emitted to the device and
+validate it or not.
+
+This also allows to sync the state between the userspace and the
+kernel/bpf program because we can intercept any incoming command.
+
+Tracing
+-------
+
+The last usage is tracing events and all the fun we can do we BPF to summarize
+and analyze events.
+
+Right now, tracing relies on hidraw. It works well except for a couple
+of issues:
+
+1. if the driver doesn't export a hidraw node, we can't trace anything
+   (eBPF will be a "god-mode" there, so this may raise some eyebrows)
+2. hidraw doesn't catch other processes' requests to the device, which
+   means that we have cases where we need to add printks to the kernel
+   to understand what is happening.
+
+High-level view of HID-BPF
+==========================
+
+The main idea behind HID-BPF is that it works at an array of bytes level.
+Thus, all of the parsing of the HID report and the HID report descriptor
+must be implemented in the userspace component that loads the eBPF
+program.
+
+For example, in the dead zone joystick from above, knowing which fields
+in the data stream needs to be set to ``0`` needs to be computed by userspace.
+
+A corollary of this is that HID-BPF doesn't know about the other subsystems
+available in the kernel. *You can not directly emit input event through the
+input API from eBPF*.
+
+When a BPF program needs to emit input events, it needs to talk with the HID
+protocol, and rely on the HID kernel processing to translate the HID data into
+input events.
+
+Available types of programs
+===========================
+
+HID-BPF is built "on top" of BPF, meaning that we use tracing method to
+declare our programs.
+
+HID-BPF has the following attachment types available:
+
+1. event processing/filtering with ``SEC("fmod_ret/hid_bpf_device_event")`` in libbpf
+2. actions coming from userspace with ``SEC("syscall")`` in libbpf
+3. change of the report descriptor with ``SEC("fmod_ret/hid_bpf_rdesc_fixup")`` in libbpf
+
+A ``hid_bpf_device_event`` is calling a BPF program when an event is received from
+the device. Thus we are in IRQ context and can act on the data or notify userspace.
+And given that we are in IRQ context, we can not talk back to the device.
+
+A ``syscall`` means that userspace called the syscall ``BPF_PROG_RUN`` facility.
+This time, we can do any operations allowed by HID-BPF, and talking to the device is
+allowed.
+
+Last, ``hid_bpf_rdesc_fixup`` is different from the others as there can be only one
+BPF program of this type. This is called on ``probe`` from the driver and allows to
+change the report descriptor from the BPF program. Once a ``hid_bpf_rdesc_fixup``
+program has been loaded, it is not possible to overwrite it unless the program which
+inserted it allows us by pinning the program and closing all of its fds pointing to it.
+
+Developer API:
+==============
+
+User API data structures available in programs:
+-----------------------------------------------
+
+.. kernel-doc:: include/linux/hid_bpf.h
+
+Available tracing functions to attach a HID-BPF program:
+--------------------------------------------------------
+
+.. kernel-doc:: drivers/hid/bpf/hid_bpf_dispatch.c
+   :functions: hid_bpf_device_event hid_bpf_rdesc_fixup
+
+Available API that can be used in all HID-BPF programs:
+-------------------------------------------------------
+
+.. kernel-doc:: drivers/hid/bpf/hid_bpf_dispatch.c
+   :functions: hid_bpf_get_data
+
+Available API that can be used in syscall HID-BPF programs:
+-----------------------------------------------------------
+
+.. kernel-doc:: drivers/hid/bpf/hid_bpf_dispatch.c
+   :functions: hid_bpf_attach_prog hid_bpf_hw_request hid_bpf_allocate_context hid_bpf_release_context
+
+General overview of a HID-BPF program
+=====================================
+
+Accessing the data attached to the context
+------------------------------------------
+
+The ``struct hid_bpf_ctx`` doesn't export the ``data`` fields directly and to access
+it, a bpf program needs to first call :c:func:`hid_bpf_get_data`.
+
+``offset`` can be any integer, but ``size`` needs to be constant, known at compile
+time.
+
+This allows the following:
+
+1. for a given device, if we know that the report length will always be of a certain value,
+   we can request the ``data`` pointer to point at the full report length.
+
+   The kernel will ensure we are using a correct size and offset and eBPF will ensure
+   the code will not attempt to read or write outside of the boundaries::
+
+     __u8 *data = hid_bpf_get_data(ctx, 0 /* offset */, 256 /* size */);
+
+     if (!data)
+         return 0; /* ensure data is correct, now the verifier knows we
+                    * have 256 bytes available */
+
+     bpf_printk("hello world: %02x %02x %02x", data[0], data[128], data[255]);
+
+2. if the report length is variable, but we know the value of ``X`` is always a 16-bit
+   integer, we can then have a pointer to that value only::
+
+      __u16 *x = hid_bpf_get_data(ctx, offset, sizeof(*x));
+
+      if (!x)
+          return 0; /* something went wrong */
+
+      *x += 1; /* increment X by one */
+
+Effect of a HID-BPF program
+---------------------------
+
+For all HID-BPF attachment types except for :c:func:`hid_bpf_rdesc_fixup`, several eBPF
+programs can be attached to the same device.
+
+Unless ``HID_BPF_FLAG_INSERT_HEAD`` is added to the flags while attaching the
+program, the new program is appended at the end of the list.
+``HID_BPF_FLAG_INSERT_HEAD`` will insert the new program at the beginning of the
+list which is useful for e.g. tracing where we need to get the unprocessed events
+from the device.
+
+Note that if there are multiple programs using the ``HID_BPF_FLAG_INSERT_HEAD`` flag,
+only the most recently loaded one is actually the first in the list.
+
+``SEC("fmod_ret/hid_bpf_device_event")``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Whenever a matching event is raised, the eBPF programs are called one after the other
+and are working on the same data buffer.
+
+If a program changes the data associated with the context, the next one will see
+the modified data but it will have *no* idea of what the original data was.
+
+Once all the programs are run and return ``0`` or a positive value, the rest of the
+HID stack will work on the modified data, with the ``size`` field of the last hid_bpf_ctx
+being the new size of the input stream of data.
+
+A BPF program returning a negative error discards the event, i.e. this event will not be
+processed by the HID stack. Clients (hidraw, input, LEDs) will **not** see this event.
+
+``SEC("syscall")``
+~~~~~~~~~~~~~~~~~~
+
+``syscall`` are not attached to a given device. To tell which device we are working
+with, userspace needs to refer to the device by its unique system id (the last 4 numbers
+in the sysfs path: ``/sys/bus/hid/devices/xxxx:yyyy:zzzz:0000``).
+
+To retrieve a context associated with the device, the program must call
+:c:func:`hid_bpf_allocate_context` and must release it with :c:func:`hid_bpf_release_context`
+before returning.
+Once the context is retrieved, one can also request a pointer to kernel memory with
+:c:func:`hid_bpf_get_data`. This memory is big enough to support all input/output/feature
+reports of the given device.
+
+``SEC("fmod_ret/hid_bpf_rdesc_fixup")``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The ``hid_bpf_rdesc_fixup`` program works in a similar manner to
+``.report_fixup`` of ``struct hid_driver``.
+
+When the device is probed, the kernel sets the data buffer of the context with the
+content of the report descriptor. The memory associated with that buffer is
+``HID_MAX_DESCRIPTOR_SIZE`` (currently 4kB).
+
+The eBPF program can modify the data buffer at-will and the kernel uses the
+modified content and size as the report descriptor.
+
+Whenever a ``SEC("fmod_ret/hid_bpf_rdesc_fixup")`` program is attached (if no
+program was attached before), the kernel immediately disconnects the HID device
+and does a reprobe.
+
+In the same way, when the ``SEC("fmod_ret/hid_bpf_rdesc_fixup")`` program is
+detached, the kernel issues a disconnect on the device.
+
+There is no ``detach`` facility in HID-BPF. Detaching a program happens when
+all the user space file descriptors pointing at a program are closed.
+Thus, if we need to replace a report descriptor fixup, some cooperation is
+required from the owner of the original report descriptor fixup.
+The previous owner will likely pin the program in the bpffs, and we can then
+replace it through normal bpf operations.
+
+Attaching a bpf program to a device
+===================================
+
+``libbpf`` does not export any helper to attach a HID-BPF program.
+Users need to use a dedicated ``syscall`` program which will call
+``hid_bpf_attach_prog(hid_id, program_fd, flags)``.
+
+``hid_id`` is the unique system ID of the HID device (the last 4 numbers in the
+sysfs path: ``/sys/bus/hid/devices/xxxx:yyyy:zzzz:0000``)
+
+``progam_fd`` is the opened file descriptor of the program to attach.
+
+``flags`` is of type ``enum hid_bpf_attach_flags``.
+
+We can not rely on hidraw to bind a BPF program to a HID device. hidraw is an
+artefact of the processing of the HID device, and is not stable. Some drivers
+even disable it, so that removes the tracing capabilies on those devices
+(where it is interesting to get the non-hidraw traces).
+
+On the other hand, the ``hid_id`` is stable for the entire life of the HID device,
+even if we change its report descriptor.
+
+Given that hidraw is not stable when the device disconnects/reconnects, we recommend
+accessing the current report descriptor of the device through the sysfs.
+This is available at ``/sys/bus/hid/devices/BUS:VID:PID.000N/report_descriptor`` as a
+binary stream.
+
+Parsing the report descriptor is the responsibility of the BPF programmer or the userspace
+component that loads the eBPF program.
+
+An (almost) complete example of a BPF enhanced HID device
+=========================================================
+
+*Foreword: for most parts, this could be implemented as a kernel driver*
+
+Let's imagine we have a new tablet device that has some haptic capabilities
+to simulate the surface the user is scratching on. This device would also have
+a specific 3 positions switch to toggle between *pencil on paper*, *cray on a wall*
+and *brush on a painting canvas*. To make things even better, we can control the
+physical position of the switch through a feature report.
+
+And of course, the switch is relying on some userspace component to control the
+haptic feature of the device itself.
+
+Filtering events
+----------------
+
+The first step consists in filtering events from the device. Given that the switch
+position is actually reported in the flow of the pen events, using hidraw to implement
+that filtering would mean that we wake up userspace for every single event.
+
+This is OK for libinput, but having an external library that is just interested in
+one byte in the report is less than ideal.
+
+For that, we can create a basic skeleton for our BPF program::
+
+  #include "vmlinux.h"
+  #include <bpf/bpf_helpers.h>
+  #include <bpf/bpf_tracing.h>
+
+  /* HID programs need to be GPL */
+  char _license[] SEC("license") = "GPL";
+
+  /* HID-BPF kfunc API definitions */
+  extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx,
+			      unsigned int offset,
+			      const size_t __sz) __ksym;
+  extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym;
+
+  struct {
+	__uint(type, BPF_MAP_TYPE_RINGBUF);
+	__uint(max_entries, 4096 * 64);
+  } ringbuf SEC(".maps");
+
+  struct attach_prog_args {
+	int prog_fd;
+	unsigned int hid;
+	unsigned int flags;
+	int retval;
+  };
+
+  SEC("syscall")
+  int attach_prog(struct attach_prog_args *ctx)
+  {
+	ctx->retval = hid_bpf_attach_prog(ctx->hid,
+					  ctx->prog_fd,
+					  ctx->flags);
+	return 0;
+  }
+
+  __u8 current_value = 0;
+
+  SEC("?fmod_ret/hid_bpf_device_event")
+  int BPF_PROG(filter_switch, struct hid_bpf_ctx *hid_ctx)
+  {
+	__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 192 /* size */);
+	__u8 *buf;
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	if (current_value != data[152]) {
+		buf = bpf_ringbuf_reserve(&ringbuf, 1, 0);
+		if (!buf)
+			return 0;
+
+		*buf = data[152];
+
+		bpf_ringbuf_commit(buf, 0);
+
+		current_value = data[152];
+	}
+
+	return 0;
+  }
+
+To attach ``filter_switch``, userspace needs to call the ``attach_prog`` syscall
+program first::
+
+  static int attach_filter(struct hid *hid_skel, int hid_id)
+  {
+	int err, prog_fd;
+	int ret = -1;
+	struct attach_prog_args args = {
+		.hid = hid_id,
+	};
+	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattrs,
+		.ctx_in = &args,
+		.ctx_size_in = sizeof(args),
+	);
+
+	args.prog_fd = bpf_program__fd(hid_skel->progs.filter_switch);
+
+	prog_fd = bpf_program__fd(hid_skel->progs.attach_prog);
+
+	err = bpf_prog_test_run_opts(prog_fd, &tattrs);
+	return err;
+  }
+
+Our userspace program can now listen to notifications on the ring buffer, and
+is awaken only when the value changes.
+
+Controlling the device
+----------------------
+
+To be able to change the haptic feedback from the tablet, the userspace program
+needs to emit a feature report on the device itself.
+
+Instead of using hidraw for that, we can create a ``SEC("syscall")`` program
+that talks to the device::
+
+  /* some more HID-BPF kfunc API definitions */
+  extern struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id) __ksym;
+  extern void hid_bpf_release_context(struct hid_bpf_ctx *ctx) __ksym;
+  extern int hid_bpf_hw_request(struct hid_bpf_ctx *ctx,
+			      __u8* data,
+			      size_t len,
+			      enum hid_report_type type,
+			      enum hid_class_request reqtype) __ksym;
+
+
+  struct hid_send_haptics_args {
+	/* data needs to come at offset 0 so we can do a memcpy into it */
+	__u8 data[10];
+	unsigned int hid;
+  };
+
+  SEC("syscall")
+  int send_haptic(struct hid_send_haptics_args *args)
+  {
+	struct hid_bpf_ctx *ctx;
+	int ret = 0;
+
+	ctx = hid_bpf_allocate_context(args->hid);
+	if (!ctx)
+		return 0; /* EPERM check */
+
+	ret = hid_bpf_hw_request(ctx,
+				 args->data,
+				 10,
+				 HID_FEATURE_REPORT,
+				 HID_REQ_SET_REPORT);
+
+	hid_bpf_release_context(ctx);
+
+	return ret;
+  }
+
+And then userspace needs to call that program directly::
+
+  static int set_haptic(struct hid *hid_skel, int hid_id, __u8 haptic_value)
+  {
+	int err, prog_fd;
+	int ret = -1;
+	struct hid_send_haptics_args args = {
+		.hid = hid_id,
+	};
+	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattrs,
+		.ctx_in = &args,
+		.ctx_size_in = sizeof(args),
+	);
+
+	args.data[0] = 0x02; /* report ID of the feature on our device */
+	args.data[1] = haptic_value;
+
+	prog_fd = bpf_program__fd(hid_skel->progs.set_haptic);
+
+	err = bpf_prog_test_run_opts(prog_fd, &tattrs);
+	return err;
+  }
+
+Now our userspace program is aware of the haptic state and can control it. The
+program could make this state further available to other userspace programs
+(e.g. via a DBus API).
+
+The interesting bit here is that we did not created a new kernel API for this.
+Which means that if there is a bug in our implementation, we can change the
+interface with the kernel at-will, because the userspace application is
+responsible for its own usage.
diff --git a/Documentation/hid/index.rst b/Documentation/hid/index.rst
index e50f513c579c..b2028f382f11 100644
--- a/Documentation/hid/index.rst
+++ b/Documentation/hid/index.rst
@@ -11,6 +11,7 @@ Human Interface Devices (HID)
    hidraw
    hid-sensor
    hid-transport
+   hid-bpf
 
    uhid
 
diff --git a/MAINTAINERS b/MAINTAINERS
index 76d8185c408e..752126fba795 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9097,6 +9097,7 @@ M:	Benjamin Tissoires <benjamin.tissoires@redhat.com>
 L:	linux-input@vger.kernel.org
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git
+F:	Documentation/hid/
 F:	drivers/hid/
 F:	include/linux/hid*
 F:	include/uapi/linux/hid*

From 576e619ba4a47329bf55ada2d184e72529793fbd Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Wed, 16 Nov 2022 11:31:10 +0100
Subject: [PATCH 15/33] HID: bpf: return non NULL data pointer when
 CONFIG_HID_BPF is not set

dispatch_hid_bpf_device_event() is supposed to return either an error,
or a valid pointer to memory containing the data.

Returning NULL simply makes a segfault when CONFIG_HID_BPF is not set
for any processed event.

Fixes: 658ee5a64fcfbbf ("HID: bpf: allocate data memory for device_event BPF program")
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 include/linux/hid_bpf.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index 9b11f8f25ad5..3ca85ab91325 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -148,7 +148,7 @@ void hid_bpf_device_init(struct hid_device *hid);
 u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size);
 #else /* CONFIG_HID_BPF */
 static inline u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type,
-						u8 *data, u32 *size, int interrupt) { return NULL; }
+						u8 *data, u32 *size, int interrupt) { return data; }
 static inline int hid_bpf_connect_device(struct hid_device *hdev) { return 0; }
 static inline void hid_bpf_disconnect_device(struct hid_device *hdev) {}
 static inline void hid_bpf_destroy_device(struct hid_device *hid) {}

From 6cc90ccd4f6cfed98e2a3a378debc69f28d57473 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 18 Nov 2022 09:42:54 +0100
Subject: [PATCH 16/33] HID: fix BT_HIDP Kconfig dependencies

If HID_SUPPORT is not selected, BT_HIDP should not be available, simply
because we disallowed the HID bus entirely.

Add a new depends and actually revert this file back to where it was 10
years ago before it was changed by commit 1f41a6a99476 ("HID: Fix the
generic Kconfig options").

Fixes: 25621bcc8976 ("HID: Kconfig: split HID support and hid-core compilation")
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/202211181514.fLhaiS7o-lkp@intel.com/
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 net/bluetooth/hidp/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hidp/Kconfig b/net/bluetooth/hidp/Kconfig
index 14100f341f33..6746be07e222 100644
--- a/net/bluetooth/hidp/Kconfig
+++ b/net/bluetooth/hidp/Kconfig
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config BT_HIDP
 	tristate "HIDP protocol support"
-	depends on BT_BREDR && INPUT
+	depends on BT_BREDR && INPUT && HID_SUPPORT
 	select HID
 	help
 	  HIDP (Human Interface Device Protocol) is a transport layer

From 7e41b2e9776d85950896d9e117a525a44bb6ce92 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 18 Nov 2022 11:54:48 +0100
Subject: [PATCH 17/33] HID: force HID depending on INPUT

In most configurations, INPUT is actually a boolean: either y or disabled,
but when it's disabled, you can't do much on your average laptop.

But it turns out that there is a possibility to have INPUT as a module:
you have to disable VT and TTY (of course), but also enable EXPERT.
I'll leave how to disable VT and TTY as an exercise for the bravest.

Anyway, if INPUT is m, we can still configure HID as y, which is not
correct because hid-input.c depends on the input API, meaning that
vmlinuz can not link.

So: add depends on INPUT too at the HID level, to ensure that if INPUT=m,
HID can only be m or disabled.

Fixes: 25621bcc8976 ("HID: Kconfig: split HID support and hid-core compilation")
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/202211181742.QYJY6Gug-lkp@intel.com
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index ff40c18f4a2b..b345bbfb57bf 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -15,6 +15,7 @@ if HID_SUPPORT
 config HID
 	tristate "HID bus core support"
 	default y
+	depends on INPUT
 	help
 	  A human interface device (HID) is a type of computer device that
 	  interacts directly with and takes input from humans. The term "HID"

From 2364b5060d780476b7455f38e3a2c7e14cc3406e Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.i.king@gmail.com>
Date: Wed, 16 Nov 2022 09:39:43 +0000
Subject: [PATCH 18/33] samples/hid: Fix spelling mistake "wihout" -> "without"

There is a spelling mistake in a comment and a usage message. Fix them.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 samples/hid/hid_surface_dial.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/samples/hid/hid_surface_dial.c b/samples/hid/hid_surface_dial.c
index bceea53d39b0..4bc97373a708 100644
--- a/samples/hid/hid_surface_dial.c
+++ b/samples/hid/hid_surface_dial.c
@@ -4,7 +4,7 @@
  * This program will morph the Microsoft Surface Dial into a mouse,
  * and depending on the chosen resolution enable or not the haptic feedback:
  * - a resolution (-r) of 3600 will report 3600 "ticks" in one full rotation
- *   wihout haptic feedback
+ *   without haptic feedback
  * - any other resolution will report N "ticks" in a full rotation with haptic
  *   feedback
  *
@@ -57,7 +57,7 @@ static void usage(const char *prog)
 		"This program will morph the Microsoft Surface Dial into a mouse,\n"
 		"and depending on the chosen resolution enable or not the haptic feedback:\n"
 		"- a resolution (-r) of 3600 will report 3600 'ticks' in one full rotation\n"
-		"  wihout haptic feedback\n"
+		"  without haptic feedback\n"
 		"- any other resolution will report N 'ticks' in a full rotation with haptic\n"
 		"  feedback\n"
 		"\n"

From 86020156c8840f2a47430f028e6ab557d8a9ed27 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Tue, 6 Dec 2022 15:59:33 +0100
Subject: [PATCH 19/33] HID: bpf: do not rely on ALLOW_ERROR_INJECTION

Now that we have  aproper non debug API to declare which function is
fmodret, we can rely on it.

Link: https://lore.kernel.org/all/20221121104403.1545f9b5@gandalf.local.home/
Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20221206145936.922196-3-benjamin.tissoires@redhat.com
---
 drivers/hid/bpf/hid_bpf_dispatch.c  | 20 ++++++++++++++++++--
 drivers/hid/bpf/hid_bpf_jmp_table.c |  1 -
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index c3920c7964dc..58e608ebf0fa 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -44,7 +44,6 @@ __weak noinline int hid_bpf_device_event(struct hid_bpf_ctx *ctx)
 {
 	return 0;
 }
-ALLOW_ERROR_INJECTION(hid_bpf_device_event, ERRNO);
 
 u8 *
 dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type, u8 *data,
@@ -105,7 +104,6 @@ __weak noinline int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx)
 {
 	return 0;
 }
-ALLOW_ERROR_INJECTION(hid_bpf_rdesc_fixup, ERRNO);
 
 u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size)
 {
@@ -429,6 +427,18 @@ hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
 	return ret;
 }
 
+/* our HID-BPF entrypoints */
+BTF_SET8_START(hid_bpf_fmodret_ids)
+BTF_ID_FLAGS(func, hid_bpf_device_event)
+BTF_ID_FLAGS(func, hid_bpf_rdesc_fixup)
+BTF_ID_FLAGS(func, __hid_bpf_tail_call)
+BTF_SET8_END(hid_bpf_fmodret_ids)
+
+static const struct btf_kfunc_id_set hid_bpf_fmodret_set = {
+	.owner = THIS_MODULE,
+	.set   = &hid_bpf_fmodret_ids,
+};
+
 /* for syscall HID-BPF */
 BTF_SET8_START(hid_bpf_syscall_kfunc_ids)
 BTF_ID_FLAGS(func, hid_bpf_attach_prog)
@@ -495,6 +505,12 @@ static int __init hid_bpf_init(void)
 	 * will not be available, so nobody will be able to use the functionality.
 	 */
 
+	err = register_btf_fmodret_id_set(&hid_bpf_fmodret_set);
+	if (err) {
+		pr_warn("error while registering fmodret entrypoints: %d", err);
+		return 0;
+	}
+
 	err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set);
 	if (err) {
 		pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index 579a6c06906e..207972b028d9 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -103,7 +103,6 @@ __weak noinline int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx)
 {
 	return 0;
 }
-ALLOW_ERROR_INJECTION(__hid_bpf_tail_call, ERRNO);
 
 int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 		     struct hid_bpf_ctx_kern *ctx_kern)

From 4e0b1b0731bd355a4dee279a270bdd5b29e68b85 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Tue, 6 Dec 2022 15:59:34 +0100
Subject: [PATCH 20/33] HID: bpf: enforce HID_BPF dependencies

As mentioned in the link below, having JIT and BPF is not enough to
have fentry/fexit/fmod_ret APIs. This resolves the error that
happens on a system without tracing enabled when hid-bpf tries to
load itself.

Link: https://lore.kernel.org/r/CABRcYmKyRchQhabi1Vd9RcMQFCcb=EtWyEbFDFRTc-L-U8WhgA@mail.gmail.com
Fixes: f5c27da4e3c8 ("HID: initial BPF implementation")
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Florent Revest <revest@chromium.org>
Reviewed-by: Jiri Kosina <jkosina@suse.cz>
Link: https://lore.kernel.org/r/20221206145936.922196-4-benjamin.tissoires@redhat.com
---
 drivers/hid/bpf/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/bpf/Kconfig b/drivers/hid/bpf/Kconfig
index 298634fc3335..03f52145b83b 100644
--- a/drivers/hid/bpf/Kconfig
+++ b/drivers/hid/bpf/Kconfig
@@ -4,7 +4,8 @@ menu "HID-BPF support"
 config HID_BPF
 	bool "HID-BPF support"
 	default HID_SUPPORT
-	depends on BPF && BPF_SYSCALL
+	depends on BPF && BPF_SYSCALL && \
+		   DYNAMIC_FTRACE_WITH_DIRECT_CALLS
 	help
 	This option allows to support eBPF programs on the HID subsystem.
 	eBPF programs can fix HID devices in a lighter way than a full

From d0b93a0d2b00a719d6c761bab5bbe72f41a81a30 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Tue, 6 Dec 2022 15:59:35 +0100
Subject: [PATCH 21/33] selftests: hid: ensures we have the proper requirements
 in config

DYNAMIC_FTRACE_WITH_DIRECT_CALLS is implicit on x86_64 but is still a
WIP on aarm64. Ensure we get it selected to not have any surprises.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Jiri Kosina <jkosina@suse.cz>
Link: https://lore.kernel.org/r/20221206145936.922196-5-benjamin.tissoires@redhat.com
---
 tools/testing/selftests/hid/config | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/hid/config b/tools/testing/selftests/hid/config
index d4130489c1b1..9c5a55abca6b 100644
--- a/tools/testing/selftests/hid/config
+++ b/tools/testing/selftests/hid/config
@@ -11,6 +11,7 @@ CONFIG_BPF_SYSCALL=y
 CONFIG_BPF=y
 CONFIG_CGROUP_BPF=y
 CONFIG_DEBUG_INFO_BTF=y
+CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS=y
 CONFIG_FPROBE=y
 CONFIG_FTRACE_SYSCALLS=y
 CONFIG_FUNCTION_TRACER=y

From e9d48abbce93e2138e37a695ba5931f3d3c9fdd9 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Tue, 6 Dec 2022 15:59:36 +0100
Subject: [PATCH 22/33] kselftests: hid: fix missing headers_install step

The Makefile was assuming that headers_install was already done in
the top source directory, and was searching for installed uapi headers
there.
Unfortunately this is not the case and we need to manually call that step.

To do so, reorder the declaration of the variables, and reuses top_srcdir
provided by lib.mk

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/all/202212060216.a6X8Py5H-lkp@intel.com/#t
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Jiri Kosina <jkosina@suse.cz>
Link: https://lore.kernel.org/r/20221206145936.922196-6-benjamin.tissoires@redhat.com
---
 tools/testing/selftests/hid/Makefile | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/tools/testing/selftests/hid/Makefile b/tools/testing/selftests/hid/Makefile
index 693f1cb6e47a..f6fc5cfff770 100644
--- a/tools/testing/selftests/hid/Makefile
+++ b/tools/testing/selftests/hid/Makefile
@@ -7,17 +7,9 @@ include ../../../scripts/Makefile.include
 
 CXX ?= $(CROSS_COMPILE)g++
 
-CURDIR := $(abspath .)
-TOOLSDIR := $(abspath ../../..)
-TOP_SRCDIR = $(CURDIR)/../../../..
-KHDR_INCLUDES := $(TOP_SRCDIR)/usr/include
-LIBDIR := $(TOOLSDIR)/lib
-BPFDIR := $(LIBDIR)/bpf
-TOOLSINCDIR := $(TOOLSDIR)/include
-BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
 HOSTPKG_CONFIG := pkg-config
 
-CFLAGS += -g -O0 -rdynamic -Wall -Werror -I$(KHDR_INCLUDES)
+CFLAGS += -g -O0 -rdynamic -Wall -Werror -I$(KHDR_INCLUDES) -I$(OUTPUT)
 LDLIBS += -lelf -lz -lrt -lpthread
 
 # Silence some warnings when compiled with clang
@@ -53,9 +45,15 @@ endef
 
 include ../lib.mk
 
+TOOLSDIR := $(top_srcdir)/tools
+LIBDIR := $(TOOLSDIR)/lib
+BPFDIR := $(LIBDIR)/bpf
+TOOLSINCDIR := $(TOOLSDIR)/include
+BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
 SCRATCH_DIR := $(OUTPUT)/tools
 BUILD_DIR := $(SCRATCH_DIR)/build
 INCLUDE_DIR := $(SCRATCH_DIR)/include
+KHDR_INCLUDES := $(SCRATCH_DIR)/uapi/include
 BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
 ifneq ($(CROSS_COMPILE),)
 HOST_BUILD_DIR		:= $(BUILD_DIR)/host
@@ -122,7 +120,6 @@ $(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile)    \
 		    prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install-bin
 
 $(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
-	   $(KHDR_INCLUDES)/linux/bpf.h					       \
 	   | $(BUILD_DIR)/libbpf
 	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
 		    EXTRA_CFLAGS='-g -O0'				       \
@@ -130,7 +127,6 @@ $(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
 
 ifneq ($(BPFOBJ),$(HOST_BPFOBJ))
 $(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
-		$(KHDR_INCLUDES)/linux/bpf.h					       \
 		| $(HOST_BUILD_DIR)/libbpf
 	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR)                             \
 		    EXTRA_CFLAGS='-g -O0' ARCH= CROSS_COMPILE=		       \
@@ -147,6 +143,9 @@ else
 	$(Q)cp "$(VMLINUX_H)" $@
 endif
 
+$(KHDR_INCLUDES)/linux/hid.h: $(top_srcdir)/include/uapi/linux/hid.h
+	$(MAKE) -C $(top_srcdir) INSTALL_HDR_PATH=$(SCRATCH_DIR)/uapi headers_install
+
 $(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids	\
 		       $(TOOLSDIR)/bpf/resolve_btfids/main.c	\
 		       $(TOOLSDIR)/lib/rbtree.c			\
@@ -178,8 +177,7 @@ MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
 
 CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
 BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) 		\
-	     -I$(INCLUDE_DIR) -I$(CURDIR) -I$(KHDR_INCLUDES)		\
-	     -I$(abspath $(OUTPUT)/../usr/include)
+	     -I$(INCLUDE_DIR)
 
 CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
 	       -Wno-compare-distinct-pointer-types
@@ -225,7 +223,7 @@ $(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT)
 	$(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
 	$(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@
 
-$(OUTPUT)/%:%.c $(BPF_SKELS)
+$(OUTPUT)/%:%.c $(BPF_SKELS) $(KHDR_INCLUDES)/linux/hid.h
 	$(call msg,BINARY,,$@)
 	$(Q)$(LINK.c) $^ $(LDLIBS) -o $@
 

From bf7660dab30dfb43fcdd3c73b1f526e53f78b76c Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 17 Jan 2023 18:20:55 +0100
Subject: [PATCH 23/33] HID: stop drivers from selecting CONFIG_HID

There is a mix of drivers using either 'depends on HID' or 'select HID',
which causes both circular dependencies and missed dependencies for
a 'select':

WARNING: unment direct dependencies for HID
  Depends on [m]: HID_SUPPORT [=y] && INPUT [=m]
  Selected by [y]:
  - AMD_SFH_HID [=y] && HID_SUPPORT [=y] && (X86_64 || COMPILE_TEST [=y]) && PCI [=y]
  Selected by [m]:
  - I2C_HID_CORE [=m] && HID_SUPPORT [=y]

WARNING: unmet direct dependencies detected for INPUT_FF_MEMLESS
  Depends on [m]: INPUT [=m]
  Selected by [y]:
  - DRAGONRISE_FF [=y] && HID_SUPPORT [=y] && HID [=y] && HID_DRAGONRISE [=y]
  - HID_MICROSOFT [=y] && HID_SUPPORT [=y] && HID [=y]
  - GREENASIA_FF [=y] && HID_SUPPORT [=y] && HID [=y] && HID_GREENASIA [=y]
  Selected by [m]:
  - INPUT_ARIZONA_HAPTICS [=m] && INPUT [=m] && INPUT_MISC [=y] && MFD_ARIZONA [=y] && SND_SOC [=m]
  - INPUT_PM8XXX_VIBRATOR [=m] && INPUT [=m] && INPUT_MISC [=y] && (MFD_PM8XXX [=m] || MFD_SPMI_PMIC [=n])
  - INPUT_MAX8997_HAPTIC [=m] && INPUT [=m] && INPUT_MISC [=y] && PWM [=y] && MFD_MAX8997 [=y]
  - INPUT_GPIO_VIBRA [=m] && INPUT [=m] && INPUT_MISC [=y] && (GPIOLIB [=y] || COMPILE_TEST [=y])
  - INPUT_REGULATOR_HAPTIC [=m] && INPUT [=m] && INPUT_MISC [=y] && REGULATOR [=y]
  - INPUT_TWL6040_VIBRA [=m] && INPUT [=m] && INPUT_MISC [=y] && TWL6040_CORE [=y]
  - INPUT_PWM_VIBRA [=m] && INPUT [=m] && INPUT_MISC [=y] && PWM [=y]
  - INPUT_DRV260X_HAPTICS [=m] && INPUT_MISC [=y] && INPUT [=m] && I2C [=y] && (GPIOLIB [=y] || COMPILE_TEST [=y])
  - INPUT_DRV2665_HAPTICS [=m] && INPUT_MISC [=y] && INPUT [=m] && I2C [=y]
  - INPUT_DRV2667_HAPTICS [=m] && INPUT_MISC [=y] && INPUT [=m] && I2C [=y]
  - INPUT_SC27XX_VIBRA [=m] && INPUT [=m] && INPUT_MISC [=y] && (MFD_SC27XX_PMIC [=y] || COMPILE_TEST [=y])
  - HID_MAYFLASH [=m] && HID_SUPPORT [=y] && HID [=y]

Avoid this by changing all HID client drivers to use 'depends on HID'.
For I2C_HID, this requires a larger rework of the Kconfig description,
but it hopefully becomes easier to understand without the complex
I2C_HID_CORE definition.

Fixes: 25621bcc8976 ("HID: Kconfig: split HID support and hid-core compilation")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/amd-sfh-hid/Kconfig   |  2 +-
 drivers/hid/i2c-hid/Kconfig       | 31 ++++++++++++++++---------------
 drivers/hid/intel-ish-hid/Kconfig |  2 +-
 3 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/hid/amd-sfh-hid/Kconfig b/drivers/hid/amd-sfh-hid/Kconfig
index 56e473fc3c93..af752dd3a340 100644
--- a/drivers/hid/amd-sfh-hid/Kconfig
+++ b/drivers/hid/amd-sfh-hid/Kconfig
@@ -5,7 +5,7 @@ menu "AMD SFH HID Support"
 
 config AMD_SFH_HID
 	tristate "AMD Sensor Fusion Hub"
-	select HID
+	depends on HID
 	help
 	  If you say yes to this option, support will be included for the
 	  AMD Sensor Fusion Hub.
diff --git a/drivers/hid/i2c-hid/Kconfig b/drivers/hid/i2c-hid/Kconfig
index 5273ee2bb134..4439be7fa74d 100644
--- a/drivers/hid/i2c-hid/Kconfig
+++ b/drivers/hid/i2c-hid/Kconfig
@@ -1,11 +1,15 @@
 # SPDX-License-Identifier: GPL-2.0-only
-menu "I2C HID support"
-	depends on I2C
+menuconfig I2C_HID
+	tristate "I2C HID support"
+	default y
+	depends on I2C && INPUT && HID
+
+if I2C_HID
 
 config I2C_HID_ACPI
 	tristate "HID over I2C transport layer ACPI driver"
-	default n
-	depends on I2C && INPUT && ACPI
+	depends on ACPI
+	select I2C_HID_CORE
 	help
 	  Say Y here if you use a keyboard, a touchpad, a touchscreen, or any
 	  other HID based devices which is connected to your computer via I2C.
@@ -19,8 +23,8 @@ config I2C_HID_ACPI
 
 config I2C_HID_OF
 	tristate "HID over I2C transport layer Open Firmware driver"
-	default n
-	depends on I2C && INPUT && OF
+	depends on OF
+	select I2C_HID_CORE
 	help
 	  Say Y here if you use a keyboard, a touchpad, a touchscreen, or any
 	  other HID based devices which is connected to your computer via I2C.
@@ -34,8 +38,8 @@ config I2C_HID_OF
 
 config I2C_HID_OF_ELAN
 	tristate "Driver for Elan hid-i2c based devices on OF systems"
-	default n
-	depends on I2C && INPUT && OF
+	depends on OF
+	select I2C_HID_CORE
 	help
 	  Say Y here if you want support for Elan i2c devices that use
 	  the i2c-hid protocol on Open Firmware (Device Tree)-based
@@ -49,8 +53,8 @@ config I2C_HID_OF_ELAN
 
 config I2C_HID_OF_GOODIX
 	tristate "Driver for Goodix hid-i2c based devices on OF systems"
-	default n
-	depends on I2C && INPUT && OF
+	depends on OF
+	select I2C_HID_CORE
 	help
 	  Say Y here if you want support for Goodix i2c devices that use
 	  the i2c-hid protocol on Open Firmware (Device Tree)-based
@@ -62,10 +66,7 @@ config I2C_HID_OF_GOODIX
 	  will be called i2c-hid-of-goodix.  It will also build/depend on
 	  the module i2c-hid.
 
-endmenu
-
 config I2C_HID_CORE
 	tristate
-	default y if I2C_HID_ACPI=y || I2C_HID_OF=y || I2C_HID_OF_GOODIX=y
-	default m if I2C_HID_ACPI=m || I2C_HID_OF=m || I2C_HID_OF_GOODIX=m
-	select HID
+endif
+
diff --git a/drivers/hid/intel-ish-hid/Kconfig b/drivers/hid/intel-ish-hid/Kconfig
index 689da84a520d..253dc10d35ef 100644
--- a/drivers/hid/intel-ish-hid/Kconfig
+++ b/drivers/hid/intel-ish-hid/Kconfig
@@ -6,7 +6,7 @@ config INTEL_ISH_HID
 	tristate "Intel Integrated Sensor Hub"
 	default n
 	depends on X86
-	select HID
+	depends on HID
 	help
 	  The Integrated Sensor Hub (ISH) enables the ability to offload
 	  sensor polling and algorithm processing to a dedicated low power

From 507806e9fdf09774d390c5f22893ba4d87ce40d5 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:27 +0100
Subject: [PATCH 24/33] selftests: hid: add vmtest.sh

Similar-ish in many points from the script in selftests/bpf, with a few
differences:
- relies on boot2container instead of a plain qemu image (meaning that
  we can take any container in a registry as a base)
- runs in the hid selftest dir, and such uses the test program from there
- the working directory to store the config is in
  tools/selftests/hid/results

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 tools/testing/selftests/hid/.gitignore    |   1 +
 tools/testing/selftests/hid/config.common | 241 ++++++++++++++++++
 tools/testing/selftests/hid/config.x86_64 |   4 +
 tools/testing/selftests/hid/vmtest.sh     | 284 ++++++++++++++++++++++
 4 files changed, 530 insertions(+)
 create mode 100644 tools/testing/selftests/hid/config.common
 create mode 100644 tools/testing/selftests/hid/config.x86_64
 create mode 100755 tools/testing/selftests/hid/vmtest.sh

diff --git a/tools/testing/selftests/hid/.gitignore b/tools/testing/selftests/hid/.gitignore
index a462ca6ab2c0..995af0670f69 100644
--- a/tools/testing/selftests/hid/.gitignore
+++ b/tools/testing/selftests/hid/.gitignore
@@ -2,3 +2,4 @@ bpftool
 *.skel.h
 /tools
 hid_bpf
+results
diff --git a/tools/testing/selftests/hid/config.common b/tools/testing/selftests/hid/config.common
new file mode 100644
index 000000000000..0617275d93cc
--- /dev/null
+++ b/tools/testing/selftests/hid/config.common
@@ -0,0 +1,241 @@
+CONFIG_9P_FS_POSIX_ACL=y
+CONFIG_9P_FS_SECURITY=y
+CONFIG_9P_FS=y
+CONFIG_AUDIT=y
+CONFIG_BINFMT_MISC=y
+CONFIG_BLK_CGROUP_IOLATENCY=y
+CONFIG_BLK_CGROUP=y
+CONFIG_BLK_DEV_BSGLIB=y
+CONFIG_BLK_DEV_IO_TRACE=y
+CONFIG_BLK_DEV_RAM_SIZE=16384
+CONFIG_BLK_DEV_RAM=y
+CONFIG_BLK_DEV_THROTTLING=y
+CONFIG_BONDING=y
+CONFIG_BOOTPARAM_HARDLOCKUP_PANIC=y
+CONFIG_BOOTTIME_TRACING=y
+CONFIG_BSD_DISKLABEL=y
+CONFIG_BSD_PROCESS_ACCT=y
+CONFIG_CFS_BANDWIDTH=y
+CONFIG_CGROUP_CPUACCT=y
+CONFIG_CGROUP_DEBUG=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_HUGETLB=y
+CONFIG_CGROUP_NET_CLASSID=y
+CONFIG_CGROUP_NET_PRIO=y
+CONFIG_CGROUP_PERF=y
+CONFIG_CGROUP_PIDS=y
+CONFIG_CGROUP_RDMA=y
+CONFIG_CGROUP_SCHED=y
+CONFIG_CGROUPS=y
+CONFIG_CGROUP_WRITEBACK=y
+CONFIG_CMA_AREAS=7
+CONFIG_CMA=y
+CONFIG_COMPAT_32BIT_TIME=y
+CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
+CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
+CONFIG_CPU_FREQ_GOV_ONDEMAND=y
+CONFIG_CPU_FREQ_GOV_USERSPACE=y
+CONFIG_CPU_FREQ_STAT=y
+CONFIG_CPU_IDLE_GOV_LADDER=y
+CONFIG_CPUSETS=y
+CONFIG_CRC_T10DIF=y
+CONFIG_CRYPTO_BLAKE2B=y
+CONFIG_CRYPTO_DEV_VIRTIO=y
+CONFIG_CRYPTO_SEQIV=y
+CONFIG_CRYPTO_XXHASH=y
+CONFIG_DCB=y
+CONFIG_DEBUG_ATOMIC_SLEEP=y
+CONFIG_DEBUG_CREDENTIALS=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
+CONFIG_DEBUG_MEMORY_INIT=y
+CONFIG_DEFAULT_FQ_CODEL=y
+CONFIG_DEFAULT_RENO=y
+CONFIG_DEFAULT_SECURITY_DAC=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_DEVTMPFS=y
+CONFIG_DMA_CMA=y
+CONFIG_DNS_RESOLVER=y
+CONFIG_EFI_STUB=y
+CONFIG_EFI=y
+CONFIG_EXPERT=y
+CONFIG_EXT4_FS_POSIX_ACL=y
+CONFIG_EXT4_FS_SECURITY=y
+CONFIG_EXT4_FS=y
+CONFIG_FAIL_FUNCTION=y
+CONFIG_FAULT_INJECTION_DEBUG_FS=y
+CONFIG_FAULT_INJECTION=y
+CONFIG_FB_MODE_HELPERS=y
+CONFIG_FB_TILEBLITTING=y
+CONFIG_FB_VESA=y
+CONFIG_FB=y
+CONFIG_FONT_8x16=y
+CONFIG_FONT_MINI_4x6=y
+CONFIG_FONTS=y
+CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y
+CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y
+CONFIG_FRAMEBUFFER_CONSOLE=y
+CONFIG_FUSE_FS=y
+CONFIG_FW_LOADER_USER_HELPER=y
+CONFIG_GART_IOMMU=y
+CONFIG_GENERIC_PHY=y
+CONFIG_HARDLOCKUP_DETECTOR=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_HPET=y
+CONFIG_HUGETLBFS=y
+CONFIG_HUGETLB_PAGE=y
+CONFIG_HWPOISON_INJECT=y
+CONFIG_HZ_1000=y
+CONFIG_INET=y
+CONFIG_INTEL_POWERCLAMP=y
+CONFIG_IP6_NF_FILTER=y
+CONFIG_IP6_NF_IPTABLES=y
+CONFIG_IP6_NF_NAT=y
+CONFIG_IP6_NF_TARGET_MASQUERADE=y
+CONFIG_IP_ADVANCED_ROUTER=y
+CONFIG_IP_MROUTE=y
+CONFIG_IP_MULTICAST=y
+CONFIG_IP_MULTIPLE_TABLES=y
+CONFIG_IP_NF_FILTER=y
+CONFIG_IP_NF_IPTABLES=y
+CONFIG_IP_NF_NAT=y
+CONFIG_IP_NF_TARGET_MASQUERADE=y
+CONFIG_IP_PIMSM_V1=y
+CONFIG_IP_PIMSM_V2=y
+CONFIG_IP_ROUTE_MULTIPATH=y
+CONFIG_IP_ROUTE_VERBOSE=y
+CONFIG_IPV6_MIP6=y
+CONFIG_IPV6_ROUTE_INFO=y
+CONFIG_IPV6_ROUTER_PREF=y
+CONFIG_IPV6_SEG6_LWTUNNEL=y
+CONFIG_IPV6_SUBTREES=y
+CONFIG_IRQ_POLL=y
+CONFIG_JUMP_LABEL=y
+CONFIG_KARMA_PARTITION=y
+CONFIG_KEXEC=y
+CONFIG_KPROBES=y
+CONFIG_KSM=y
+CONFIG_LEGACY_VSYSCALL_NONE=y
+CONFIG_LOG_BUF_SHIFT=21
+CONFIG_LOG_CPU_MAX_BUF_SHIFT=0
+CONFIG_LOGO=y
+CONFIG_LSM="selinux,bpf,integrity"
+CONFIG_MAC_PARTITION=y
+CONFIG_MAGIC_SYSRQ=y
+CONFIG_MCORE2=y
+CONFIG_MEMCG=y
+CONFIG_MEMORY_FAILURE=y
+CONFIG_MINIX_SUBPARTITION=y
+CONFIG_MODULES=y
+CONFIG_NAMESPACES=y
+CONFIG_NET_9P_VIRTIO=y
+CONFIG_NET_9P=y
+CONFIG_NET_ACT_BPF=y
+CONFIG_NET_CLS_CGROUP=y
+CONFIG_NETDEVICES=y
+CONFIG_NET_EMATCH=y
+CONFIG_NETFILTER_NETLINK_LOG=y
+CONFIG_NETFILTER_NETLINK_QUEUE=y
+CONFIG_NETFILTER_XTABLES=y
+CONFIG_NETFILTER_XT_MATCH_ADDRTYPE=y
+CONFIG_NETFILTER_XT_MATCH_BPF=y
+CONFIG_NETFILTER_XT_MATCH_COMMENT=y
+CONFIG_NETFILTER_XT_MATCH_CONNTRACK=y
+CONFIG_NETFILTER_XT_MATCH_MARK=y
+CONFIG_NETFILTER_XT_MATCH_MULTIPORT=y
+CONFIG_NETFILTER_XT_MATCH_STATISTIC=y
+CONFIG_NETFILTER_XT_NAT=y
+CONFIG_NETFILTER_XT_TARGET_MASQUERADE=y
+CONFIG_NET_IPGRE_BROADCAST=y
+CONFIG_NET_L3_MASTER_DEV=y
+CONFIG_NETLABEL=y
+CONFIG_NET_SCH_DEFAULT=y
+CONFIG_NET_SCHED=y
+CONFIG_NET_SCH_FQ_CODEL=y
+CONFIG_NET_TC_SKB_EXT=y
+CONFIG_NET_VRF=y
+CONFIG_NET=y
+CONFIG_NF_CONNTRACK=y
+CONFIG_NF_NAT_MASQUERADE=y
+CONFIG_NF_NAT=y
+CONFIG_NLS_ASCII=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_DEFAULT="utf8"
+CONFIG_NO_HZ=y
+CONFIG_NR_CPUS=128
+CONFIG_NUMA_BALANCING=y
+CONFIG_NUMA=y
+CONFIG_NVMEM=y
+CONFIG_OSF_PARTITION=y
+CONFIG_OVERLAY_FS_INDEX=y
+CONFIG_OVERLAY_FS_METACOPY=y
+CONFIG_OVERLAY_FS_XINO_AUTO=y
+CONFIG_OVERLAY_FS=y
+CONFIG_PACKET=y
+CONFIG_PANIC_ON_OOPS=y
+CONFIG_PARTITION_ADVANCED=y
+CONFIG_PCIEPORTBUS=y
+CONFIG_PCI_IOV=y
+CONFIG_PCI_MSI=y
+CONFIG_PCI=y
+CONFIG_PHYSICAL_ALIGN=0x1000000
+CONFIG_POSIX_MQUEUE=y
+CONFIG_POWER_SUPPLY=y
+CONFIG_PREEMPT=y
+CONFIG_PRINTK_TIME=y
+CONFIG_PROC_KCORE=y
+CONFIG_PROFILING=y
+CONFIG_PROVE_LOCKING=y
+CONFIG_PTP_1588_CLOCK=y
+CONFIG_RC_DEVICES=y
+CONFIG_RC_LOOPBACK=y
+CONFIG_RCU_CPU_STALL_TIMEOUT=60
+CONFIG_SCHED_STACK_END_CHECK=y
+CONFIG_SCHEDSTATS=y
+CONFIG_SECURITY_NETWORK=y
+CONFIG_SECURITY_SELINUX=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_DETECT_IRQ=y
+CONFIG_SERIAL_8250_EXTENDED=y
+CONFIG_SERIAL_8250_MANY_PORTS=y
+CONFIG_SERIAL_8250_NR_UARTS=32
+CONFIG_SERIAL_8250_RSA=y
+CONFIG_SERIAL_8250_SHARE_IRQ=y
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_NONSTANDARD=y
+CONFIG_SERIO_LIBPS2=y
+CONFIG_SGI_PARTITION=y
+CONFIG_SMP=y
+CONFIG_SOCK_CGROUP_DATA=y
+CONFIG_SOLARIS_X86_PARTITION=y
+CONFIG_SUN_PARTITION=y
+CONFIG_SYNC_FILE=y
+CONFIG_SYSVIPC=y
+CONFIG_TASK_DELAY_ACCT=y
+CONFIG_TASK_IO_ACCOUNTING=y
+CONFIG_TASKSTATS=y
+CONFIG_TASK_XACCT=y
+CONFIG_TCP_CONG_ADVANCED=y
+CONFIG_TCP_MD5SIG=y
+CONFIG_TLS=y
+CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_TMPFS=y
+CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y
+CONFIG_TRANSPARENT_HUGEPAGE=y
+CONFIG_TUN=y
+CONFIG_UNIXWARE_DISKLABEL=y
+CONFIG_UNIX=y
+CONFIG_USER_NS=y
+CONFIG_VALIDATE_FS_PARSER=y
+CONFIG_VETH=y
+CONFIG_VIRT_DRIVERS=y
+CONFIG_VIRTIO_BALLOON=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_VIRTIO_CONSOLE=y
+CONFIG_VIRTIO_FS=y
+CONFIG_VIRTIO_NET=y
+CONFIG_VIRTIO_PCI=y
+CONFIG_VLAN_8021Q=y
+CONFIG_XFRM_SUB_POLICY=y
+CONFIG_XFRM_USER=y
+CONFIG_ZEROPLUS_FF=y
diff --git a/tools/testing/selftests/hid/config.x86_64 b/tools/testing/selftests/hid/config.x86_64
new file mode 100644
index 000000000000..a8721f403c21
--- /dev/null
+++ b/tools/testing/selftests/hid/config.x86_64
@@ -0,0 +1,4 @@
+CONFIG_X86_ACPI_CPUFREQ=y
+CONFIG_X86_CPUID=y
+CONFIG_X86_MSR=y
+CONFIG_X86_POWERNOW_K8=y
diff --git a/tools/testing/selftests/hid/vmtest.sh b/tools/testing/selftests/hid/vmtest.sh
new file mode 100755
index 000000000000..90f34150f257
--- /dev/null
+++ b/tools/testing/selftests/hid/vmtest.sh
@@ -0,0 +1,284 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+set -u
+set -e
+
+# This script currently only works for x86_64
+ARCH="$(uname -m)"
+case "${ARCH}" in
+x86_64)
+	QEMU_BINARY=qemu-system-x86_64
+	BZIMAGE="arch/x86/boot/bzImage"
+	;;
+*)
+	echo "Unsupported architecture"
+	exit 1
+	;;
+esac
+DEFAULT_COMMAND="./hid_bpf"
+SCRIPT_DIR="$(dirname $(realpath $0))"
+OUTPUT_DIR="$SCRIPT_DIR/results"
+KCONFIG_REL_PATHS=("${SCRIPT_DIR}/config" "${SCRIPT_DIR}/config.common" "${SCRIPT_DIR}/config.${ARCH}")
+B2C_URL="https://gitlab.freedesktop.org/mupuf/boot2container/-/raw/master/vm2c.py"
+NUM_COMPILE_JOBS="$(nproc)"
+LOG_FILE_BASE="$(date +"hid_selftests.%Y-%m-%d_%H-%M-%S")"
+LOG_FILE="${LOG_FILE_BASE}.log"
+EXIT_STATUS_FILE="${LOG_FILE_BASE}.exit_status"
+CONTAINER_IMAGE="registry.fedoraproject.org/fedora:36"
+
+usage()
+{
+	cat <<EOF
+Usage: $0 [-i] [-s] [-d <output_dir>] -- [<command>]
+
+<command> is the command you would normally run when you are in
+tools/testing/selftests/bpf. e.g:
+
+	$0 -- ./hid_bpf
+
+If no command is specified and a debug shell (-s) is not requested,
+"${DEFAULT_COMMAND}" will be run by default.
+
+If you build your kernel using KBUILD_OUTPUT= or O= options, these
+can be passed as environment variables to the script:
+
+  O=<kernel_build_path> $0 -- ./hid_bpf
+
+or
+
+  KBUILD_OUTPUT=<kernel_build_path> $0 -- ./hid_bpf
+
+Options:
+
+	-u)		Update the boot2container script to a newer version.
+	-d)		Update the output directory (default: ${OUTPUT_DIR})
+	-j)		Number of jobs for compilation, similar to -j in make
+			(default: ${NUM_COMPILE_JOBS})
+	-s)		Instead of powering off the VM, start an interactive
+			shell. If <command> is specified, the shell runs after
+			the command finishes executing
+EOF
+}
+
+download()
+{
+	local file="$1"
+
+	echo "Downloading $file..." >&2
+	curl -Lsf "$file" -o "${@:2}"
+}
+
+recompile_kernel()
+{
+	local kernel_checkout="$1"
+	local make_command="$2"
+
+	cd "${kernel_checkout}"
+
+	${make_command} olddefconfig
+	${make_command}
+}
+
+update_selftests()
+{
+	local kernel_checkout="$1"
+	local selftests_dir="${kernel_checkout}/tools/testing/selftests/hid"
+
+	cd "${selftests_dir}"
+	${make_command}
+}
+
+run_vm()
+{
+	local b2c="$1"
+	local kernel_bzimage="$2"
+	local command="$3"
+	local post_command=""
+
+	if ! which "${QEMU_BINARY}" &> /dev/null; then
+		cat <<EOF
+Could not find ${QEMU_BINARY}
+Please install qemu or set the QEMU_BINARY environment variable.
+EOF
+		exit 1
+	fi
+
+	# alpine (used in post-container requires the PATH to have /bin
+	export PATH=$PATH:/bin
+
+	if [[ "${debug_shell}" != "yes" ]]
+	then
+		touch ${OUTPUT_DIR}/${LOG_FILE}
+		command="mount bpffs -t bpf /sys/fs/bpf/; set -o pipefail ; ${command} 2>&1 | tee ${OUTPUT_DIR}/${LOG_FILE}"
+		post_command="cat ${OUTPUT_DIR}/${LOG_FILE}"
+	else
+		command="mount bpffs -t bpf /sys/fs/bpf/; ${command}"
+	fi
+
+	set +e
+	$b2c --command "${command}" \
+	     --kernel ${kernel_bzimage} \
+	     --workdir ${OUTPUT_DIR} \
+	     --image ${CONTAINER_IMAGE}
+
+	echo $? > ${OUTPUT_DIR}/${EXIT_STATUS_FILE}
+
+	set -e
+
+	${post_command}
+}
+
+is_rel_path()
+{
+	local path="$1"
+
+	[[ ${path:0:1} != "/" ]]
+}
+
+do_update_kconfig()
+{
+	local kernel_checkout="$1"
+	local kconfig_file="$2"
+
+	rm -f "$kconfig_file" 2> /dev/null
+
+	for config in "${KCONFIG_REL_PATHS[@]}"; do
+		local kconfig_src="${config}"
+		cat "$kconfig_src" >> "$kconfig_file"
+	done
+}
+
+update_kconfig()
+{
+	local kernel_checkout="$1"
+	local kconfig_file="$2"
+
+	if [[ -f "${kconfig_file}" ]]; then
+		local local_modified="$(stat -c %Y "${kconfig_file}")"
+
+		for config in "${KCONFIG_REL_PATHS[@]}"; do
+			local kconfig_src="${config}"
+			local src_modified="$(stat -c %Y "${kconfig_src}")"
+			# Only update the config if it has been updated after the
+			# previously cached config was created. This avoids
+			# unnecessarily compiling the kernel and selftests.
+			if [[ "${src_modified}" -gt "${local_modified}" ]]; then
+				do_update_kconfig "$kernel_checkout" "$kconfig_file"
+				# Once we have found one outdated configuration
+				# there is no need to check other ones.
+				break
+			fi
+		done
+	else
+		do_update_kconfig "$kernel_checkout" "$kconfig_file"
+	fi
+}
+
+main()
+{
+	local script_dir="$(cd -P -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)"
+	local kernel_checkout=$(realpath "${script_dir}"/../../../../)
+	# By default the script searches for the kernel in the checkout directory but
+	# it also obeys environment variables O= and KBUILD_OUTPUT=
+	local kernel_bzimage="${kernel_checkout}/${BZIMAGE}"
+	local command="${DEFAULT_COMMAND}"
+	local update_b2c="no"
+	local debug_shell="no"
+
+	while getopts ':hsud:j:' opt; do
+		case ${opt} in
+		u)
+			update_b2c="yes"
+			;;
+		d)
+			OUTPUT_DIR="$OPTARG"
+			;;
+		j)
+			NUM_COMPILE_JOBS="$OPTARG"
+			;;
+		s)
+			command="/bin/sh"
+			debug_shell="yes"
+			;;
+		h)
+			usage
+			exit 0
+			;;
+		\? )
+			echo "Invalid Option: -$OPTARG"
+			usage
+			exit 1
+			;;
+		: )
+			echo "Invalid Option: -$OPTARG requires an argument"
+			usage
+			exit 1
+			;;
+		esac
+	done
+	shift $((OPTIND -1))
+
+	# trap 'catch "$?"' EXIT
+
+	if [[ "${debug_shell}" == "no" ]]; then
+		if [[ $# -eq 0 ]]; then
+			echo "No command specified, will run ${DEFAULT_COMMAND} in the vm"
+		else
+			command="$@"
+
+			if [[ "${command}" == "/bin/bash" || "${command}" == "bash" ]]
+			then
+				debug_shell="yes"
+			fi
+		fi
+	fi
+
+	local kconfig_file="${OUTPUT_DIR}/latest.config"
+	local make_command="make -j ${NUM_COMPILE_JOBS} KCONFIG_CONFIG=${kconfig_file}"
+
+	# Figure out where the kernel is being built.
+	# O takes precedence over KBUILD_OUTPUT.
+	if [[ "${O:=""}" != "" ]]; then
+		if is_rel_path "${O}"; then
+			O="$(realpath "${PWD}/${O}")"
+		fi
+		kernel_bzimage="${O}/${BZIMAGE}"
+		make_command="${make_command} O=${O}"
+	elif [[ "${KBUILD_OUTPUT:=""}" != "" ]]; then
+		if is_rel_path "${KBUILD_OUTPUT}"; then
+			KBUILD_OUTPUT="$(realpath "${PWD}/${KBUILD_OUTPUT}")"
+		fi
+		kernel_bzimage="${KBUILD_OUTPUT}/${BZIMAGE}"
+		make_command="${make_command} KBUILD_OUTPUT=${KBUILD_OUTPUT}"
+	fi
+
+	local b2c="${OUTPUT_DIR}/vm2c.py"
+
+	echo "Output directory: ${OUTPUT_DIR}"
+
+	mkdir -p "${OUTPUT_DIR}"
+	update_kconfig "${kernel_checkout}" "${kconfig_file}"
+
+	recompile_kernel "${kernel_checkout}" "${make_command}"
+
+	if [[ "${update_b2c}" == "no" && ! -f "${b2c}" ]]; then
+		echo "vm2c script not found in ${b2c}"
+		update_b2c="yes"
+	fi
+
+	if [[ "${update_b2c}" == "yes" ]]; then
+		download $B2C_URL $b2c
+		chmod +x $b2c
+	fi
+
+	update_selftests "${kernel_checkout}" "${make_command}"
+	run_vm $b2c "${kernel_bzimage}" "${command}"
+	if [[ "${debug_shell}" != "yes" ]]; then
+		echo "Logs saved in ${OUTPUT_DIR}/${LOG_FILE}"
+	fi
+
+	exit $(cat ${OUTPUT_DIR}/${EXIT_STATUS_FILE})
+}
+
+main "$@"

From 633ba3be76426056a047b2a355082d94afa9230d Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:28 +0100
Subject: [PATCH 25/33] selftests: hid: allow to compile hid_bpf with LLVM

clang doesn't like to compile a source to the final binary directly:

clang-14: error: cannot specify -o when generating multiple output files

So split the final rule in 2, and ensure we compile all dependencies
before.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 tools/testing/selftests/hid/Makefile | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/hid/Makefile b/tools/testing/selftests/hid/Makefile
index f6fc5cfff770..83e8f87d643a 100644
--- a/tools/testing/selftests/hid/Makefile
+++ b/tools/testing/selftests/hid/Makefile
@@ -91,10 +91,6 @@ $(MAKE_DIRS):
 	$(call msg,MKDIR,,$@)
 	$(Q)mkdir -p $@
 
-$(OUTPUT)/%.o: %.c
-	$(call msg,CC,,$@)
-	$(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
-
 # LLVM's ld.lld doesn't support all the architectures, so use it only on x86
 ifeq ($(SRCARCH),x86)
 LLD := lld
@@ -223,7 +219,11 @@ $(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT)
 	$(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
 	$(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@
 
-$(OUTPUT)/%:%.c $(BPF_SKELS) $(KHDR_INCLUDES)/linux/hid.h
+$(OUTPUT)/%.o: %.c $(BPF_SKELS) $(KHDR_INCLUDES)/linux/hid.h
+	$(call msg,CC,,$@)
+	$(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
+
+$(OUTPUT)/%: $(OUTPUT)/%.o
 	$(call msg,BINARY,,$@)
 	$(Q)$(LINK.c) $^ $(LDLIBS) -o $@
 

From cea6c4d969bb104d2847e1f4ed708ae0126d6f42 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:29 +0100
Subject: [PATCH 26/33] selftests: hid: attach/detach 2 bpf programs, not just
 one

Add a second BPF program to attach to the device, as the development of
this feature showed that we also need to ensure we can detach multiple
programs to a device (hid_bpf_link->hid_table_index was actually not set
initially, and this lead to any BPF program not being released except for
the first one).

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 tools/testing/selftests/hid/hid_bpf.c   |  8 +++++++-
 tools/testing/selftests/hid/progs/hid.c | 13 +++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index 6615c26fb5dd..d215bb492eb4 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -616,6 +616,7 @@ TEST_F(hid_bpf, test_attach_detach)
 {
 	const struct test_program progs[] = {
 		{ .name = "hid_first_event" },
+		{ .name = "hid_second_event" },
 	};
 	__u8 buf[10] = {0};
 	int err;
@@ -634,7 +635,10 @@ TEST_F(hid_bpf, test_attach_detach)
 	ASSERT_EQ(buf[0], 1);
 	ASSERT_EQ(buf[2], 47);
 
-	/* pin the program and immediately unpin it */
+	/* make sure both programs are run */
+	ASSERT_EQ(buf[3], 52);
+
+	/* pin the first program and immediately unpin it */
 #define PIN_PATH "/sys/fs/bpf/hid_first_event"
 	bpf_program__pin(self->skel->progs.hid_first_event, PIN_PATH);
 	remove(PIN_PATH);
@@ -660,6 +664,7 @@ TEST_F(hid_bpf, test_attach_detach)
 	ASSERT_EQ(buf[0], 1);
 	ASSERT_EQ(buf[1], 47);
 	ASSERT_EQ(buf[2], 0);
+	ASSERT_EQ(buf[3], 0);
 
 	/* re-attach our program */
 
@@ -677,6 +682,7 @@ TEST_F(hid_bpf, test_attach_detach)
 	ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
 	ASSERT_EQ(buf[0], 1);
 	ASSERT_EQ(buf[2], 47);
+	ASSERT_EQ(buf[3], 52);
 }
 
 /*
diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c
index 6a86af0aa545..88c593f753b5 100644
--- a/tools/testing/selftests/hid/progs/hid.c
+++ b/tools/testing/selftests/hid/progs/hid.c
@@ -32,6 +32,19 @@ int BPF_PROG(hid_first_event, struct hid_bpf_ctx *hid_ctx)
 	return hid_ctx->size;
 }
 
+SEC("?fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_second_event, struct hid_bpf_ctx *hid_ctx)
+{
+	__u8 *rw_data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
+
+	if (!rw_data)
+		return 0; /* EPERM check */
+
+	rw_data[3] = rw_data[2] + 5;
+
+	return hid_ctx->size;
+}
+
 SEC("?fmod_ret/hid_bpf_device_event")
 int BPF_PROG(hid_change_report_id, struct hid_bpf_ctx *hid_ctx)
 {

From d9db1bb55f1032020328ede7a88b2490574646d3 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:30 +0100
Subject: [PATCH 27/33] selftests: hid: ensure the program is correctly pinned

Turns out that if bpffs was not mounted, the test was silently passing.

So ensure it passes by checking the mount command result.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 tools/testing/selftests/hid/hid_bpf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index d215bb492eb4..3b204a15e44b 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -640,7 +640,8 @@ TEST_F(hid_bpf, test_attach_detach)
 
 	/* pin the first program and immediately unpin it */
 #define PIN_PATH "/sys/fs/bpf/hid_first_event"
-	bpf_program__pin(self->skel->progs.hid_first_event, PIN_PATH);
+	err = bpf_program__pin(self->skel->progs.hid_first_event, PIN_PATH);
+	ASSERT_OK(err) TH_LOG("error while calling bpf_program__pin");
 	remove(PIN_PATH);
 #undef PIN_PATH
 	usleep(100000);

From 2574917a2b48f87bd45f1c3e6d80c976f4fe3c3d Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:31 +0100
Subject: [PATCH 28/33] selftests: hid: prepare tests for HID_BPF API change

We plan on changing the return value of hid_bpf_attach_prog().
Instead of returning an error code, it will return an fd to a bpf_link.
This bpf_link is responsible for the binding between the bpf program and
the hid device.

Add a fallback mechanism to not break bisections by pinning the program
when we run this test against the non changed kernel.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 tools/testing/selftests/hid/hid_bpf.c | 29 +++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index 3b204a15e44b..9a262fe99b32 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -444,13 +444,21 @@ FIXTURE(hid_bpf) {
 	int hid_id;
 	pthread_t tid;
 	struct hid *skel;
+	int hid_links[3]; /* max number of programs loaded in a single test */
 };
 static void detach_bpf(FIXTURE_DATA(hid_bpf) * self)
 {
+	int i;
+
 	if (self->hidraw_fd)
 		close(self->hidraw_fd);
 	self->hidraw_fd = 0;
 
+	for (i = 0; i < ARRAY_SIZE(self->hid_links); i++) {
+		if (self->hid_links[i])
+			close(self->hid_links[i]);
+	}
+
 	hid__destroy(self->skel);
 	self->skel = NULL;
 }
@@ -512,6 +520,9 @@ static void load_programs(const struct test_program programs[],
 			    .ctx_size_in = sizeof(args),
 	);
 
+	ASSERT_LE(progs_count, ARRAY_SIZE(self->hid_links))
+		TH_LOG("too many programs are to be loaded");
+
 	/* open the bpf file */
 	self->skel = hid__open();
 	ASSERT_OK_PTR(self->skel) TEARDOWN_LOG("Error while calling hid__open");
@@ -543,7 +554,10 @@ static void load_programs(const struct test_program programs[],
 		args.hid = self->hid_id;
 		args.insert_head = programs[i].insert_head;
 		err = bpf_prog_test_run_opts(attach_fd, &tattr);
-		ASSERT_OK(args.retval) TH_LOG("attach_hid(%s): %d", programs[i].name, args.retval);
+		ASSERT_GE(args.retval, 0)
+			TH_LOG("attach_hid(%s): %d", programs[i].name, args.retval);
+
+		self->hid_links[i] = args.retval;
 	}
 
 	self->hidraw_fd = open_hidraw(self->dev_id);
@@ -619,10 +633,17 @@ TEST_F(hid_bpf, test_attach_detach)
 		{ .name = "hid_second_event" },
 	};
 	__u8 buf[10] = {0};
-	int err;
+	int err, link;
 
 	LOAD_PROGRAMS(progs);
 
+	link = self->hid_links[0];
+	/* we might not be using the new code path where hid_bpf_attach_prog()
+	 * returns a link.
+	 */
+	if (!link)
+		link = bpf_program__fd(self->skel->progs.hid_first_event);
+
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
@@ -640,8 +661,8 @@ TEST_F(hid_bpf, test_attach_detach)
 
 	/* pin the first program and immediately unpin it */
 #define PIN_PATH "/sys/fs/bpf/hid_first_event"
-	err = bpf_program__pin(self->skel->progs.hid_first_event, PIN_PATH);
-	ASSERT_OK(err) TH_LOG("error while calling bpf_program__pin");
+	err = bpf_obj_pin(link, PIN_PATH);
+	ASSERT_OK(err) TH_LOG("error while calling bpf_obj_pin");
 	remove(PIN_PATH);
 #undef PIN_PATH
 	usleep(100000);

From 4b9a3f49f02bf682eedfde23ef56a8df82c1e5d2 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:32 +0100
Subject: [PATCH 29/33] HID: bpf: rework how programs are attached and stored
 in the kernel

Previously, HID-BPF was relying on a bpf tracing program to be notified
when a program was released from userspace. This is error prone, as
LLVM sometimes inline the function and sometimes not.

So instead of messing up with the bpf prog ref count, we can use the
bpf_link concept which actually matches exactly what we want:
- a bpf_link represents the fact that a given program is attached to a
  given HID device
- as long as the bpf_link has fd opened (either by the userspace program
  still being around or by pinning the bpf object in the bpffs), the
  program stays attached to the HID device
- once every user has closed the fd, we get called by
  hid_bpf_link_release() that we no longer have any users, and we can
  disconnect the program to the device in 2 passes: first atomically clear
  the bit saying that the link is active, and then calling release_work in
  a scheduled work item.

This solves entirely the problems of BPF tracing not showing up and is
definitely cleaner.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 Documentation/hid/hid-bpf.rst       |  12 ++-
 drivers/hid/bpf/hid_bpf_dispatch.c  |  18 ++--
 drivers/hid/bpf/hid_bpf_jmp_table.c | 128 +++++++++++++++-------------
 include/linux/hid_bpf.h             |   7 ++
 4 files changed, 96 insertions(+), 69 deletions(-)

diff --git a/Documentation/hid/hid-bpf.rst b/Documentation/hid/hid-bpf.rst
index a55f191d49a3..c205f92b7bcc 100644
--- a/Documentation/hid/hid-bpf.rst
+++ b/Documentation/hid/hid-bpf.rst
@@ -427,12 +427,22 @@ program first::
 	prog_fd = bpf_program__fd(hid_skel->progs.attach_prog);
 
 	err = bpf_prog_test_run_opts(prog_fd, &tattrs);
-	return err;
+	if (err)
+		return err;
+
+	return args.retval; /* the fd of the created bpf_link */
   }
 
 Our userspace program can now listen to notifications on the ring buffer, and
 is awaken only when the value changes.
 
+When the userspace program doesn't need to listen to events anymore, it can just
+close the returned fd from :c:func:`attach_filter`, which will tell the kernel to
+detach the program from the HID device.
+
+Of course, in other use cases, the userspace program can also pin the fd to the
+BPF filesystem through a call to :c:func:`bpf_obj_pin`, as with any bpf_link.
+
 Controlling the device
 ----------------------
 
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 58e608ebf0fa..8d29fd361ab9 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -249,7 +249,9 @@ int hid_bpf_reconnect(struct hid_device *hdev)
  * @prog_fd: an fd in the user process representing the program to attach
  * @flags: any logical OR combination of &enum hid_bpf_attach_flags
  *
- * @returns %0 on success, an error code otherwise.
+ * @returns an fd of a bpf_link object on success (> %0), an error code otherwise.
+ * Closing this fd will detach the program from the HID device (unless the bpf_link
+ * is pinned to the BPF file system).
  */
 /* called from syscall */
 noinline int
@@ -257,7 +259,7 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 {
 	struct hid_device *hdev;
 	struct device *dev;
-	int err, prog_type = hid_bpf_get_prog_attach_type(prog_fd);
+	int fd, err, prog_type = hid_bpf_get_prog_attach_type(prog_fd);
 
 	if (!hid_bpf_ops)
 		return -EINVAL;
@@ -283,17 +285,19 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 			return err;
 	}
 
-	err = __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
-	if (err)
-		return err;
+	fd = __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
+	if (fd < 0)
+		return fd;
 
 	if (prog_type == HID_BPF_PROG_TYPE_RDESC_FIXUP) {
 		err = hid_bpf_reconnect(hdev);
-		if (err)
+		if (err) {
+			close_fd(fd);
 			return err;
+		}
 	}
 
-	return 0;
+	return fd;
 }
 
 /**
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index 207972b028d9..b7eb5c5e435f 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -322,16 +322,6 @@ static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
 	if (err)
 		goto out;
 
-	/*
-	 * The program has been safely inserted, decrement the reference count
-	 * so it doesn't interfere with the number of actual user handles.
-	 * This is safe to do because:
-	 * - we overrite the put_ptr in the prog fd map
-	 * - we also have a cleanup function that monitors when a program gets
-	 *   released and we manually do the cleanup in the prog fd map
-	 */
-	bpf_prog_sub(prog, 1);
-
 	/* return the index */
 	err = index;
 
@@ -365,14 +355,46 @@ int hid_bpf_get_prog_attach_type(int prog_fd)
 	return prog_type;
 }
 
+static void hid_bpf_link_release(struct bpf_link *link)
+{
+	struct hid_bpf_link *hid_link =
+		container_of(link, struct hid_bpf_link, link);
+
+	__clear_bit(hid_link->hid_table_index, jmp_table.enabled);
+	schedule_work(&release_work);
+}
+
+static void hid_bpf_link_dealloc(struct bpf_link *link)
+{
+	struct hid_bpf_link *hid_link =
+		container_of(link, struct hid_bpf_link, link);
+
+	kfree(hid_link);
+}
+
+static void hid_bpf_link_show_fdinfo(const struct bpf_link *link,
+					 struct seq_file *seq)
+{
+	seq_printf(seq,
+		   "attach_type:\tHID-BPF\n");
+}
+
+static const struct bpf_link_ops hid_bpf_link_lops = {
+	.release = hid_bpf_link_release,
+	.dealloc = hid_bpf_link_dealloc,
+	.show_fdinfo = hid_bpf_link_show_fdinfo,
+};
+
 /* called from syscall */
 noinline int
 __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
 		      int prog_fd, __u32 flags)
 {
+	struct bpf_link_primer link_primer;
+	struct hid_bpf_link *link;
 	struct bpf_prog *prog = NULL;
 	struct hid_bpf_prog_entry *prog_entry;
-	int cnt, err = -EINVAL, prog_idx = -1;
+	int cnt, err = -EINVAL, prog_table_idx = -1;
 
 	/* take a ref on the prog itself */
 	prog = bpf_prog_get(prog_fd);
@@ -381,23 +403,32 @@ __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
 
 	mutex_lock(&hid_bpf_attach_lock);
 
+	link = kzalloc(sizeof(*link), GFP_USER);
+	if (!link) {
+		err = -ENOMEM;
+		goto err_unlock;
+	}
+
+	bpf_link_init(&link->link, BPF_LINK_TYPE_UNSPEC,
+		      &hid_bpf_link_lops, prog);
+
 	/* do not attach too many programs to a given HID device */
 	cnt = hid_bpf_program_count(hdev, NULL, prog_type);
 	if (cnt < 0) {
 		err = cnt;
-		goto out_unlock;
+		goto err_unlock;
 	}
 
 	if (cnt >= hid_bpf_max_programs(prog_type)) {
 		err = -E2BIG;
-		goto out_unlock;
+		goto err_unlock;
 	}
 
-	prog_idx = hid_bpf_insert_prog(prog_fd, prog);
+	prog_table_idx = hid_bpf_insert_prog(prog_fd, prog);
 	/* if the jmp table is full, abort */
-	if (prog_idx < 0) {
-		err = prog_idx;
-		goto out_unlock;
+	if (prog_table_idx < 0) {
+		err = prog_table_idx;
+		goto err_unlock;
 	}
 
 	if (flags & HID_BPF_FLAG_INSERT_HEAD) {
@@ -412,22 +443,32 @@ __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
 
 	/* we steal the ref here */
 	prog_entry->prog = prog;
-	prog_entry->idx = prog_idx;
+	prog_entry->idx = prog_table_idx;
 	prog_entry->hdev = hdev;
 	prog_entry->type = prog_type;
 
 	/* finally store the index in the device list */
 	err = hid_bpf_populate_hdev(hdev, prog_type);
-	if (err)
-		hid_bpf_release_prog_at(prog_idx);
+	if (err) {
+		hid_bpf_release_prog_at(prog_table_idx);
+		goto err_unlock;
+	}
+
+	link->hid_table_index = prog_table_idx;
+
+	err = bpf_link_prime(&link->link, &link_primer);
+	if (err)
+		goto err_unlock;
 
- out_unlock:
 	mutex_unlock(&hid_bpf_attach_lock);
 
-	/* we only use prog as a key in the various tables, so we don't need to actually
-	 * increment the ref count.
-	 */
+	return bpf_link_settle(&link_primer);
+
+ err_unlock:
+	mutex_unlock(&hid_bpf_attach_lock);
+
 	bpf_prog_put(prog);
+	kfree(link);
 
 	return err;
 }
@@ -460,36 +501,10 @@ void __hid_bpf_destroy_device(struct hid_device *hdev)
 
 void call_hid_bpf_prog_put_deferred(struct work_struct *work)
 {
-	struct bpf_prog_aux *aux;
-	struct bpf_prog *prog;
-	bool found = false;
-	int i;
-
-	aux = container_of(work, struct bpf_prog_aux, work);
-	prog = aux->prog;
-
-	/* we don't need locking here because the entries in the progs table
-	 * are stable:
-	 * if there are other users (and the progs entries might change), we
-	 * would simply not have been called.
-	 */
-	for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
-		if (jmp_table.progs[i] == prog) {
-			__clear_bit(i, jmp_table.enabled);
-			found = true;
-		}
-	}
-
-	if (found)
-		/* schedule release of all detached progs */
-		schedule_work(&release_work);
+	/* kept around for patch readability, to be dropped in the next commmit */
 }
 
-static void hid_bpf_prog_fd_array_put_ptr(void *ptr)
-{
-}
-
-#define HID_BPF_PROGS_COUNT 2
+#define HID_BPF_PROGS_COUNT 1
 
 static struct bpf_link *links[HID_BPF_PROGS_COUNT];
 static struct entrypoints_bpf *skel;
@@ -528,8 +543,6 @@ void hid_bpf_free_links_and_skel(void)
 	idx++;									\
 } while (0)
 
-static struct bpf_map_ops hid_bpf_prog_fd_maps_ops;
-
 int hid_bpf_preload_skel(void)
 {
 	int err, idx = 0;
@@ -548,14 +561,7 @@ int hid_bpf_preload_skel(void)
 		goto out;
 	}
 
-	/* our jump table is stealing refs, so we should not decrement on removal of elements */
-	hid_bpf_prog_fd_maps_ops = *jmp_table.map->ops;
-	hid_bpf_prog_fd_maps_ops.map_fd_put_ptr = hid_bpf_prog_fd_array_put_ptr;
-
-	jmp_table.map->ops = &hid_bpf_prog_fd_maps_ops;
-
 	ATTACH_AND_STORE_LINK(hid_tail_call);
-	ATTACH_AND_STORE_LINK(hid_bpf_prog_put_deferred);
 
 	return 0;
 out:
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index 3ca85ab91325..e9afb61e6ee0 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -3,6 +3,7 @@
 #ifndef __HID_BPF_H
 #define __HID_BPF_H
 
+#include <linux/bpf.h>
 #include <linux/spinlock.h>
 #include <uapi/linux/hid.h>
 
@@ -138,6 +139,12 @@ struct hid_bpf {
 	spinlock_t progs_lock;		/* protects RCU update of progs */
 };
 
+/* specific HID-BPF link when a program is attached to a device */
+struct hid_bpf_link {
+	struct bpf_link link;
+	int hid_table_index;
+};
+
 #ifdef CONFIG_HID_BPF
 u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data,
 				  u32 *size, int interrupt);

From 6e021d64e4897759e19ce431ee6a366338c00be8 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:33 +0100
Subject: [PATCH 30/33] selftests: hid: enforce new attach API

Now that the new API for hid_bpf_attach_prog() is in place, ensure we
get an fd when calling this function. And remove the fallback code.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 tools/testing/selftests/hid/hid_bpf.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index 9a262fe99b32..2cf96f818f25 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -638,11 +638,7 @@ TEST_F(hid_bpf, test_attach_detach)
 	LOAD_PROGRAMS(progs);
 
 	link = self->hid_links[0];
-	/* we might not be using the new code path where hid_bpf_attach_prog()
-	 * returns a link.
-	 */
-	if (!link)
-		link = bpf_program__fd(self->skel->progs.hid_first_event);
+	ASSERT_GT(link, 0) TH_LOG("HID-BPF link not created");
 
 	/* inject one event */
 	buf[0] = 1;

From bb2c0aeac145c4e5b74620fd8c0f7862777b8677 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:34 +0100
Subject: [PATCH 31/33] HID: bpf: clean up entrypoint

We don't need to watch for calls on bpf_prog_put_deferred(), so remove
that from the entrypoints.bpf.c file.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/entrypoints/entrypoints.bpf.c |   9 -
 .../hid/bpf/entrypoints/entrypoints.lskel.h   | 188 +++++-------------
 drivers/hid/bpf/hid_bpf_dispatch.c            |   1 -
 drivers/hid/bpf/hid_bpf_dispatch.h            |   3 -
 drivers/hid/bpf/hid_bpf_jmp_table.c           |   5 -
 5 files changed, 53 insertions(+), 153 deletions(-)

diff --git a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
index 7c1895d9e5c0..c22921125a1a 100644
--- a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
+++ b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
@@ -7,8 +7,6 @@
 
 #define HID_BPF_MAX_PROGS 1024
 
-extern void call_hid_bpf_prog_put_deferred(struct work_struct *work) __ksym;
-
 struct {
 	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
 	__uint(max_entries, HID_BPF_MAX_PROGS);
@@ -24,11 +22,4 @@ int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
 	return 0;
 }
 
-SEC("fentry/bpf_prog_put_deferred")
-int BPF_PROG(hid_bpf_prog_put_deferred, struct work_struct *work)
-{
-	call_hid_bpf_prog_put_deferred(work);
-	return 0;
-}
-
 char LICENSE[] SEC("license") = "GPL";
diff --git a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
index 9ffb991b3e6f..35618051598c 100644
--- a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
+++ b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
@@ -12,11 +12,9 @@ struct entrypoints_bpf {
 	} maps;
 	struct {
 		struct bpf_prog_desc hid_tail_call;
-		struct bpf_prog_desc hid_bpf_prog_put_deferred;
 	} progs;
 	struct {
 		int hid_tail_call_fd;
-		int hid_bpf_prog_put_deferred_fd;
 	} links;
 };
 
@@ -31,24 +29,12 @@ entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel)
 	return fd;
 }
 
-static inline int
-entrypoints_bpf__hid_bpf_prog_put_deferred__attach(struct entrypoints_bpf *skel)
-{
-	int prog_fd = skel->progs.hid_bpf_prog_put_deferred.prog_fd;
-	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
-
-	if (fd > 0)
-		skel->links.hid_bpf_prog_put_deferred_fd = fd;
-	return fd;
-}
-
 static inline int
 entrypoints_bpf__attach(struct entrypoints_bpf *skel)
 {
 	int ret = 0;
 
 	ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel);
-	ret = ret < 0 ? ret : entrypoints_bpf__hid_bpf_prog_put_deferred__attach(skel);
 	return ret < 0 ? ret : 0;
 }
 
@@ -56,7 +42,6 @@ static inline void
 entrypoints_bpf__detach(struct entrypoints_bpf *skel)
 {
 	skel_closenz(skel->links.hid_tail_call_fd);
-	skel_closenz(skel->links.hid_bpf_prog_put_deferred_fd);
 }
 static void
 entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
@@ -65,7 +50,6 @@ entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
 		return;
 	entrypoints_bpf__detach(skel);
 	skel_closenz(skel->progs.hid_tail_call.prog_fd);
-	skel_closenz(skel->progs.hid_bpf_prog_put_deferred.prog_fd);
 	skel_closenz(skel->maps.hid_jmp_table.map_fd);
 	skel_free(skel);
 }
@@ -91,7 +75,7 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 	int err;
 
 	opts.ctx = (struct bpf_loader_ctx *)skel;
-	opts.data_sz = 3792;
+	opts.data_sz = 2856;
 	opts.data = (void *)"\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
@@ -126,7 +110,7 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x9f\xeb\x01\0\
-\x18\0\0\0\0\0\0\0\xa4\x03\0\0\xa4\x03\0\0\x54\x03\0\0\0\0\0\0\0\0\0\x02\x03\0\
+\x18\0\0\0\0\0\0\0\x60\x02\0\0\x60\x02\0\0\x12\x02\0\0\0\0\0\0\0\0\0\x02\x03\0\
 \0\0\x01\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\
 \0\0\x04\0\0\0\x03\0\0\0\x05\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\0\0\0\0\0\0\0\0\
 \x02\x06\0\0\0\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\0\x04\0\0\0\0\0\0\
@@ -139,25 +123,14 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 \0\0\0\0\0\0\0\x1b\x01\0\0\x12\0\0\0\x40\0\0\0\x1f\x01\0\0\x10\0\0\0\x80\0\0\0\
 \x2e\x01\0\0\x14\0\0\0\xa0\0\0\0\0\0\0\0\x15\0\0\0\xc0\0\0\0\x3a\x01\0\0\0\0\0\
 \x08\x11\0\0\0\x40\x01\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\0\0\0\0\0\0\0\0\x02\x13\
-\0\0\0\0\0\0\0\0\0\0\x0a\x2d\0\0\0\x4d\x01\0\0\x04\0\0\x06\x04\0\0\0\x5d\x01\0\
+\0\0\0\0\0\0\0\0\0\0\x0a\x1c\0\0\0\x4d\x01\0\0\x04\0\0\x06\x04\0\0\0\x5d\x01\0\
 \0\0\0\0\0\x6e\x01\0\0\x01\0\0\0\x80\x01\0\0\x02\0\0\0\x93\x01\0\0\x03\0\0\0\0\
 \0\0\0\x02\0\0\x05\x04\0\0\0\xa4\x01\0\0\x16\0\0\0\0\0\0\0\xab\x01\0\0\x16\0\0\
-\0\0\0\0\0\xb0\x01\0\0\0\0\0\x08\x02\0\0\0\0\0\0\0\x01\0\0\x0d\x02\0\0\0\x5f\0\
-\0\0\x0b\0\0\0\xec\x01\0\0\x01\0\0\x0c\x17\0\0\0\0\0\0\0\x01\0\0\x0d\0\0\0\0\
-\x49\x03\0\0\x1a\0\0\0\0\0\0\0\0\0\0\x02\x1b\0\0\0\x8c\x02\0\0\x03\0\0\x04\x20\
-\0\0\0\x98\x02\0\0\x1c\0\0\0\0\0\0\0\x9d\x02\0\0\x22\0\0\0\x40\0\0\0\xa3\x02\0\
-\0\x24\0\0\0\xc0\0\0\0\xa8\x02\0\0\0\0\0\x08\x1d\0\0\0\xb6\x02\0\0\0\0\0\x08\
-\x1e\0\0\0\0\0\0\0\x01\0\0\x04\x08\0\0\0\xc1\x02\0\0\x1f\0\0\0\0\0\0\0\xc9\x02\
-\0\0\0\0\0\x08\x20\0\0\0\xcd\x02\0\0\0\0\0\x08\x21\0\0\0\xd3\x02\0\0\0\0\0\x01\
-\x08\0\0\0\x40\0\0\x01\xdd\x02\0\0\x02\0\0\x04\x10\0\0\0\xe7\x02\0\0\x23\0\0\0\
-\0\0\0\0\xec\x02\0\0\x23\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\x02\x22\0\0\0\xf1\x02\0\
-\0\0\0\0\x08\x25\0\0\0\0\0\0\0\0\0\0\x02\x19\0\0\0\xfd\x02\0\0\x01\0\0\x0c\x19\
-\0\0\0\x1c\x03\0\0\0\0\0\x01\x01\0\0\0\x08\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\
-\x27\0\0\0\x04\0\0\0\x04\0\0\0\x21\x03\0\0\0\0\0\x0e\x28\0\0\0\x01\0\0\0\x29\
-\x03\0\0\x01\0\0\x0f\x04\0\0\0\x2e\0\0\0\0\0\0\0\x04\0\0\0\x30\x03\0\0\x01\0\0\
-\x0f\x20\0\0\0\x0a\0\0\0\0\0\0\0\x20\0\0\0\x36\x03\0\0\x01\0\0\x0f\x04\0\0\0\
-\x29\0\0\0\0\0\0\0\x04\0\0\0\x3e\x03\0\0\0\0\0\x07\0\0\0\0\x49\x03\0\0\0\0\0\
-\x0e\x02\0\0\0\x01\0\0\0\0\x69\x6e\x74\0\x5f\x5f\x41\x52\x52\x41\x59\x5f\x53\
+\0\0\0\0\0\xb0\x01\0\0\0\0\0\x08\x02\0\0\0\xec\x01\0\0\0\0\0\x01\x01\0\0\0\x08\
+\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x17\0\0\0\x04\0\0\0\x04\0\0\0\xf1\x01\0\0\0\
+\0\0\x0e\x18\0\0\0\x01\0\0\0\xf9\x01\0\0\x01\0\0\x0f\x20\0\0\0\x0a\0\0\0\0\0\0\
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@@ -182,119 +155,64 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
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-\x66\x65\x72\x72\x65\x64\0\0";
-	opts.insns_sz = 2056;
+\0\0";
+	opts.insns_sz = 1192;
 	opts.insns = (void *)"\
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-\0\xb8\x0d\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xb0\x0e\0\0\xb7\x02\0\0\x1f\0\0\0\
-\xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\x07\0\0\0\0\
-\0\0\xc5\x07\x36\xff\0\0\0\0\x75\x07\x03\0\0\0\0\0\x62\x08\x04\0\0\0\0\0\x6a\
-\x08\x02\0\0\0\0\0\x05\0\x0a\0\0\0\0\0\x63\x78\x04\0\0\0\0\0\xbf\x79\0\0\0\0\0\
-\0\x77\x09\0\0\x20\0\0\0\x55\x09\x02\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x04\
-\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\x63\x90\0\0\0\0\0\0\x6a\x08\
-\x02\0\x40\0\0\0\xb7\x01\0\0\x05\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\x08\x0e\0\0\
-\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\
-\0\0\0\0\0\0\0\x01\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\
-\0\0\0\x85\0\0\0\xa8\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x78\x0e\0\0\x61\x01\0\0\
-\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\
-\x15\xff\0\0\0\0\x63\x7a\x84\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\
-\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\
-\x06\x28\0\0\0\0\0\x61\xa0\x84\xff\0\0\0\0\x63\x06\x2c\0\0\0\0\0\x18\x61\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\0\0\0\xb7\0\0\0\0\0\
-\0\0\x95\0\0\0\0\0\0\0";
+\x01\x01\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\
+\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\
+\xbf\x70\0\0\0\0\0\0\x95\0\0\0\0\0\0\0\x61\x60\x08\0\0\0\0\0\x18\x61\0\0\0\0\0\
+\0\0\0\0\0\xa8\x09\0\0\x63\x01\0\0\0\0\0\0\x61\x60\x0c\0\0\0\0\0\x18\x61\0\0\0\
+\0\0\0\0\0\0\0\xa4\x09\0\0\x63\x01\0\0\0\0\0\0\x79\x60\x10\0\0\0\0\0\x18\x61\0\
+\0\0\0\0\0\0\0\0\0\x98\x09\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\
+\0\x05\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x90\x09\0\0\x7b\x01\0\0\0\0\0\0\xb7\x01\
+\0\0\x12\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\x90\x09\0\0\xb7\x03\0\0\x1c\0\0\0\
+\x85\0\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\xc5\x07\xd7\xff\0\0\0\0\x63\x7a\x78\
+\xff\0\0\0\0\x61\x60\x1c\0\0\0\0\0\x15\0\x03\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\
+\0\0\xbc\x09\0\0\x63\x01\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x18\x62\0\0\0\0\0\0\0\
+\0\0\0\xb0\x09\0\0\xb7\x03\0\0\x48\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\
+\0\xc5\x07\xca\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x63\x71\0\0\0\0\
+\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xf8\x09\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x90\
+\x0a\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x0a\0\0\x18\x61\0\0\
+\0\0\0\0\0\0\0\0\x88\x0a\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\
+\x38\x0a\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xd0\x0a\0\0\x7b\x01\0\0\0\0\0\0\x18\
+\x60\0\0\0\0\0\0\0\0\0\0\x40\x0a\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xe0\x0a\0\0\
+\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x70\x0a\0\0\x18\x61\0\0\0\0\0\
+\0\0\0\0\0\0\x0b\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\x18\x61\0\0\0\0\0\0\0\0\0\0\xf8\x0a\0\0\x7b\x01\0\0\0\0\0\0\x61\x60\x08\0\0\0\
+\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x98\x0a\0\0\x63\x01\0\0\0\0\0\0\x61\x60\x0c\0\
+\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x9c\x0a\0\0\x63\x01\0\0\0\0\0\0\x79\x60\
+\x10\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xa0\x0a\0\0\x7b\x01\0\0\0\0\0\0\x61\
+\xa0\x78\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xc8\x0a\0\0\x63\x01\0\0\0\0\0\
+\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x10\x0b\0\0\xb7\x02\0\0\x14\0\0\0\xb7\x03\0\0\
+\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\x07\0\0\0\0\0\0\xc5\x07\
+\x91\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x80\x0a\0\0\x63\x70\x6c\0\0\0\0\0\
+\x77\x07\0\0\x20\0\0\0\x63\x70\x70\0\0\0\0\0\xb7\x01\0\0\x05\0\0\0\x18\x62\0\0\
+\0\0\0\0\0\0\0\0\x80\x0a\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\
+\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xf0\x0a\0\0\x61\x01\0\0\0\0\0\0\xd5\
+\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\x7f\xff\0\0\
+\0\0\x63\x7a\x80\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\
+\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\x06\x28\0\0\0\
+\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\0\
+\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
 	err = bpf_load_and_run(&opts);
 	if (err < 0)
 		return err;
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 8d29fd361ab9..26117b4ec016 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -173,7 +173,6 @@ hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr
  * can use.
  */
 BTF_SET8_START(hid_bpf_kfunc_ids)
-BTF_ID_FLAGS(func, call_hid_bpf_prog_put_deferred)
 BTF_ID_FLAGS(func, hid_bpf_get_data, KF_RET_NULL)
 BTF_SET8_END(hid_bpf_kfunc_ids)
 
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h
index 2eeab1f746dd..63dfc8605cd2 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.h
+++ b/drivers/hid/bpf/hid_bpf_dispatch.h
@@ -22,7 +22,4 @@ int hid_bpf_reconnect(struct hid_device *hdev);
 
 struct bpf_prog;
 
-/* HID-BPF internal kfuncs API */
-void call_hid_bpf_prog_put_deferred(struct work_struct *work);
-
 #endif
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index b7eb5c5e435f..eca34b7372f9 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -499,11 +499,6 @@ void __hid_bpf_destroy_device(struct hid_device *hdev)
 	schedule_work(&release_work);
 }
 
-void call_hid_bpf_prog_put_deferred(struct work_struct *work)
-{
-	/* kept around for patch readability, to be dropped in the next commmit */
-}
-
 #define HID_BPF_PROGS_COUNT 1
 
 static struct bpf_link *links[HID_BPF_PROGS_COUNT];

From 0c2d572828a68e8416619e0832d4d55317cb3c57 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:35 +0100
Subject: [PATCH 32/33] HID: bpf: reorder BPF registration

Given that our initial BPF program is not using any kfuncs anymore,
we can reorder the initialization to first try to load it and then
register the kfuncs. This has the advantage of not exporting kfuncs
when HID-BPF is not working.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/hid_bpf_dispatch.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 26117b4ec016..8a034a555d4c 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -514,18 +514,19 @@ static int __init hid_bpf_init(void)
 		return 0;
 	}
 
-	err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set);
-	if (err) {
-		pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
-		return 0;
-	}
-
 	err = hid_bpf_preload_skel();
 	if (err) {
 		pr_warn("error while preloading HID BPF dispatcher: %d", err);
 		return 0;
 	}
 
+	/* register tracing kfuncs after we are sure we can load our preloaded bpf program */
+	err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set);
+	if (err) {
+		pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
+		return 0;
+	}
+
 	/* register syscalls after we are sure we can load our preloaded bpf program */
 	err = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &hid_bpf_syscall_kfunc_set);
 	if (err) {

From 2f7f4efb9411770b4ad99eb314d6418e980248b4 Mon Sep 17 00:00:00 2001
From: Randy Dunlap <rdunlap@infradead.org>
Date: Thu, 26 Jan 2023 22:39:40 -0800
Subject: [PATCH 33/33] Documentation: hid: correct spelling

Correct spelling problems for Documentation/hid/ as reported
by codespell.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: linux-input@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20230127064005.1558-11-rdunlap@infradead.org
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
 Documentation/hid/hid-alps.rst      | 2 +-
 Documentation/hid/hid-bpf.rst       | 2 +-
 Documentation/hid/hiddev.rst        | 2 +-
 Documentation/hid/hidraw.rst        | 2 +-
 Documentation/hid/intel-ish-hid.rst | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Documentation/hid/hid-alps.rst b/Documentation/hid/hid-alps.rst
index 767c96bcbb7c..94382bb0ada4 100644
--- a/Documentation/hid/hid-alps.rst
+++ b/Documentation/hid/hid-alps.rst
@@ -9,7 +9,7 @@ Currently ALPS HID driver supports U1 Touchpad device.
 U1 device basic information.
 
 ==========	======
-Vender ID	0x044E
+Vendor ID	0x044E
 Product ID	0x120B
 Version ID	0x0121
 ==========	======
diff --git a/Documentation/hid/hid-bpf.rst b/Documentation/hid/hid-bpf.rst
index c205f92b7bcc..4fad83a6ebc3 100644
--- a/Documentation/hid/hid-bpf.rst
+++ b/Documentation/hid/hid-bpf.rst
@@ -307,7 +307,7 @@ sysfs path: ``/sys/bus/hid/devices/xxxx:yyyy:zzzz:0000``)
 
 We can not rely on hidraw to bind a BPF program to a HID device. hidraw is an
 artefact of the processing of the HID device, and is not stable. Some drivers
-even disable it, so that removes the tracing capabilies on those devices
+even disable it, so that removes the tracing capabilities on those devices
 (where it is interesting to get the non-hidraw traces).
 
 On the other hand, the ``hid_id`` is stable for the entire life of the HID device,
diff --git a/Documentation/hid/hiddev.rst b/Documentation/hid/hiddev.rst
index caebc6266603..9b82c7f896aa 100644
--- a/Documentation/hid/hiddev.rst
+++ b/Documentation/hid/hiddev.rst
@@ -8,7 +8,7 @@ Introduction
 In addition to the normal input type HID devices, USB also uses the
 human interface device protocols for things that are not really human
 interfaces, but have similar sorts of communication needs. The two big
-examples for this are power devices (especially uninterruptable power
+examples for this are power devices (especially uninterruptible power
 supplies) and monitor control on higher end monitors.
 
 To support these disparate requirements, the Linux USB system provides
diff --git a/Documentation/hid/hidraw.rst b/Documentation/hid/hidraw.rst
index b717ee5cdaef..14d076753b85 100644
--- a/Documentation/hid/hidraw.rst
+++ b/Documentation/hid/hidraw.rst
@@ -163,7 +163,7 @@ HIDIOCGOUTPUT(len):
 	Get an Output Report
 
 This ioctl will request an output report from the device using the control
-endpoint.  Typically, this is used to retrive the initial state of
+endpoint.  Typically, this is used to retrieve the initial state of
 an output report of a device, before an application updates it as necessary either
 via a HIDIOCSOUTPUT request, or the regular device write() interface.  The format
 of the buffer issued with this report is identical to that of HIDIOCGFEATURE.
diff --git a/Documentation/hid/intel-ish-hid.rst b/Documentation/hid/intel-ish-hid.rst
index 7a851252267a..91b5c52b3708 100644
--- a/Documentation/hid/intel-ish-hid.rst
+++ b/Documentation/hid/intel-ish-hid.rst
@@ -199,7 +199,7 @@ the sender that the memory region for that message may be reused.
 DMA initialization is started with host sending DMA_ALLOC_NOTIFY bus message
 (that includes RX buffer) and FW responds with DMA_ALLOC_NOTIFY_ACK.
 Additionally to DMA address communication, this sequence checks capabilities:
-if thw host doesn't support DMA, then it won't send DMA allocation, so FW can't
+if the host doesn't support DMA, then it won't send DMA allocation, so FW can't
 send DMA; if FW doesn't support DMA then it won't respond with
 DMA_ALLOC_NOTIFY_ACK, in which case host will not use DMA transfers.
 Here ISH acts as busmaster DMA controller. Hence when host sends DMA_XFER,