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The lock_contention BPF program uses __sync_val_compare_and_swap() to atomically update the max_time and min_time fields in contention_data. This builtin lowers to the BPF_CMPXCHG instruction, which is only available in BPF ISA v3. Without an explicit -mcpu flag, Clang targets BPF v1/v2 by default on older toolchains (Clang < 18), causing build errors when v3 instructions are emitted. Add -mcpu=v3 to CLANG_OPTIONS, which is used exclusively in the BPF skeleton compilation rule. Reviewed-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Suchit Karunakaran <suchitkarunakaran@gmail.com> Acked-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@linaro.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Suchit Karunakaran <suchitkarunakaran@gmail.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
110 lines
3.6 KiB
Makefile
110 lines
3.6 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# Shared BPF Skeleton Generator Rules
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include $(srctree)/tools/scripts/Makefile.include
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# Shared foundational tooling always lives in util/bpf_skel
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SKEL_TOOL_OUT := $(abspath $(OUTPUT)util/bpf_skel)
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SKEL_TOOL_TMP_OUT := $(abspath $(SKEL_TOOL_OUT)/.tmp)
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# Component specific output lives in $(dir)/bpf_skel
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SKEL_OUT := $(abspath $(OUTPUT)$(dir)/bpf_skel)
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SKEL_TMP_OUT := $(abspath $(SKEL_OUT)/.tmp)
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ifeq ($(CONFIG_PERF_BPF_SKEL),y)
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BPFTOOL := $(SKEL_TOOL_TMP_OUT)/bootstrap/bpftool
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VMLINUX_H := $(SKEL_TOOL_OUT)/vmlinux.h
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.PHONY: bpf-skel-prepare
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bpf-skel-prepare: $(BPFTOOL) $(VMLINUX_H)
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@:
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define get_sys_includes
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$(shell $(1) $(2) -v -E - </dev/null 2>&1 \
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| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
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$(shell $(1) $(2) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
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endef
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ifneq ($(CROSS_COMPILE),)
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CLANG_TARGET_ARCH = --target=$(notdir $(CROSS_COMPILE:%-=%))
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endif
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CLANG_OPTIONS = -Wall -mcpu=v3
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CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))
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LIBBPF_INCLUDE := $(abspath $(or $(OUTPUT),.))/libbpf/include
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BPF_INCLUDE := -I$(SKEL_TMP_OUT)/.. -I$(SKEL_TOOL_OUT) -I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES)
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TOOLS_UAPI_INCLUDE := -I$(srctree)/tools/include/uapi
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ifneq ($(WERROR),0)
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CLANG_OPTIONS += -Werror
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endif
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$(BPFTOOL):
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$(Q)mkdir -p $(SKEL_TOOL_TMP_OUT)
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$(Q)CFLAGS= $(MAKE) -C ../bpf/bpftool OUTPUT=$(SKEL_TOOL_TMP_OUT)/ bootstrap
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# Paths to search for a kernel to generate vmlinux.h from.
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VMLINUX_BTF_ELF_PATHS ?= $(if $(O),$(O)/vmlinux) \
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$(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
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../../vmlinux \
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/boot/vmlinux-$(shell uname -r)
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# Paths to BTF information.
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VMLINUX_BTF_BTF_PATHS ?= /sys/kernel/btf/vmlinux
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# Filter out kernels that don't exist or without a BTF section.
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VMLINUX_BTF_ELF_ABSPATHS ?= $(abspath $(wildcard $(VMLINUX_BTF_ELF_PATHS)))
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VMLINUX_BTF_PATHS ?= $(shell for file in $(VMLINUX_BTF_ELF_ABSPATHS); \
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do \
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if [ -f $$file ] && ($(READELF) -S "$$file" | grep -q .BTF); \
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then \
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echo "$$file"; \
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fi; \
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done) \
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$(wildcard $(VMLINUX_BTF_BTF_PATHS))
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# Select the first as the source of vmlinux.h.
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VMLINUX_BTF ?= $(firstword $(VMLINUX_BTF_PATHS))
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ifeq ($(VMLINUX_H_FILE),)
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ifeq ($(VMLINUX_BTF),)
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$(error Missing bpftool input for generating vmlinux.h)
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endif
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endif
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$(VMLINUX_H): $(VMLINUX_BTF) $(BPFTOOL) $(VMLINUX_H_FILE)
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$(call rule_mkdir)
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ifeq ($(VMLINUX_H_FILE),)
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$(QUIET_GEN)$(BPFTOOL) btf dump file $< format c > $@
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else
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$(Q)cp "$(VMLINUX_H_FILE)" $@
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endif
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# Consolidated Pattern rule for $(dir)/bpf_skel/
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$(SKEL_TMP_OUT)/%.bpf.o: $(srctree)/tools/perf/$(dir)/bpf_skel/%.bpf.c $(LIBBPF) $(VMLINUX_H) $(OUTPUT)PERF-VERSION-FILE util/bpf_skel/perf_version.h
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$(call rule_mkdir)
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$(QUIET_CLANG)
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$(Q)$(CLANG) -g -O2 -fno-stack-protector --target=bpf \
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$(CLANG_OPTIONS) $(EXTRA_BPF_FLAGS) $(BPF_INCLUDE) $(TOOLS_UAPI_INCLUDE) \
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-include $(OUTPUT)PERF-VERSION-FILE -include util/bpf_skel/perf_version.h \
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-fms-extensions -Wno-microsoft-anon-tag \
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-c $< -o $@
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$(SKEL_OUT)/%.skel.h: $(SKEL_TMP_OUT)/%.bpf.o $(BPFTOOL)
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$(call rule_mkdir)
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$(QUIET_GENSKEL)
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$(Q)$(BPFTOOL) gen skeleton $< > $@
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.PRECIOUS: $(SKEL_TMP_OUT)/%.bpf.o
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else # CONFIG_PERF_BPF_SKEL
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.PHONY: bpf-skel-prepare
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bpf-skel-prepare:
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@:
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endif # CONFIG_PERF_BPF_SKEL
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clean:
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$(call QUIET_CLEAN, bpf-skel) $(RM) -r $(SKEL_TOOL_TMP_OUT) $(OUTPUT)bench/bpf_skel/.tmp $(SKEL_TOOL_OUT)/*.skel.h $(OUTPUT)bench/bpf_skel/*.skel.h $(SKEL_TOOL_OUT)/vmlinux.h
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.PHONY: clean
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