From 0d8928ed6ee38f00f3595e1f3b623de0d99c311d Mon Sep 17 00:00:00 2001
From: Sangmoon Kim <sangmoon.kim@samsung.com>
Date: Thu, 8 Oct 2020 10:42:06 +0900
Subject: [PATCH] ANDROID: sysrq: add vendor hook for sysrq crash information

 - Add the hook to provide additional information
   of sysrq crash.

Bug: 170234110

Signed-off-by: Sangmoon Kim <sangmoon.kim@samsung.com>
Change-Id: Ib8f14eaa639b2ef959e911d611515868ff9f193d
(cherry picked from commit 32b242337266a3b8e170b0ddc4bec478d5cf1f94)
---
 drivers/android/vendor_hooks.c   |  2 ++
 drivers/tty/sysrq.c              |  4 ++++
 include/trace/hooks/sysrqcrash.h | 24 ++++++++++++++++++++++++
 3 files changed, 30 insertions(+)
 create mode 100644 include/trace/hooks/sysrqcrash.h

diff --git a/drivers/android/vendor_hooks.c b/drivers/android/vendor_hooks.c
index 85f867a76f1d..0be3e8603f8b 100644
--- a/drivers/android/vendor_hooks.c
+++ b/drivers/android/vendor_hooks.c
@@ -20,6 +20,7 @@
 #include <trace/hooks/gic.h>
 #include <trace/hooks/wqlockup.h>
 #include <trace/hooks/debug.h>
+#include <trace/hooks/sysrqcrash.h>
 
 /*
  * Export tracepoints that act as a bare tracehook (ie: have no trace event
@@ -61,3 +62,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_find_busiest_group);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_gic_resume);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_wq_lockup_pool);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_ipi_stop);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_sysrq_crash);
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index a8e39b2cdd55..28459e9cc8c5 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -54,6 +54,8 @@
 #include <asm/ptrace.h>
 #include <asm/irq_regs.h>
 
+#include <trace/hooks/sysrqcrash.h>
+
 /* Whether we react on sysrq keys or just ignore them */
 static int __read_mostly sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 static bool __read_mostly sysrq_always_enabled;
@@ -150,6 +152,8 @@ static void sysrq_handle_crash(int key)
 	/* release the RCU read lock before crashing */
 	rcu_read_unlock();
 
+	trace_android_vh_sysrq_crash(current);
+
 	panic("sysrq triggered crash\n");
 }
 static const struct sysrq_key_op sysrq_crash_op = {
diff --git a/include/trace/hooks/sysrqcrash.h b/include/trace/hooks/sysrqcrash.h
new file mode 100644
index 000000000000..e5d9102ba4e1
--- /dev/null
+++ b/include/trace/hooks/sysrqcrash.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM sysrqcrash
+#define TRACE_INCLUDE_PATH trace/hooks
+
+#if !defined(_TRACE_HOOK_SYSRQCRASH_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_HOOK_SYSRQCRASH_H
+#include <linux/tracepoint.h>
+#include <trace/hooks/vendor_hooks.h>
+/*
+ * Following tracepoints are not exported in tracefs and provide a
+ * mechanism for vendor modules to hook and extend functionality
+ */
+#if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_ANDROID_VENDOR_HOOKS)
+DECLARE_HOOK(android_vh_sysrq_crash,
+	TP_PROTO(void *data),
+	TP_ARGS(data));
+#else
+#define trace_android_vh_sysrq_crash(data)
+#endif
+
+#endif /* _TRACE_HOOK_SYSRQCRASH_H */
+/* This part must be outside protection */
+#include <trace/define_trace.h>