From 56da24e7a9ba0f5bab4a0c90de964ce1541b1695 Mon Sep 17 00:00:00 2001
From: Changki Kim <changki.kim@samsung.com>
Date: Sun, 23 Aug 2020 14:36:48 +0900
Subject: [PATCH] ANDROID: vendor_hooks: Add new android vendor hooks for ipi
 stop

When a kernel panic occurred, it is sometimes caused by a other cpu
than the panic cpu. When a panic cpu sends smp stop IPI, it can help to
solve the problem even more if aonther cpu stores registers and
run cache flush.

Bug: 165956922

Change-Id: I747f776456330d904015cfe4ae423e4b63f18f85
Signed-off-by: Changki Kim <changki.kim@samsung.com>
Signed-off-by: Will McVicker <willmcvicker@google.com>
Signed-off-by: Jonglin Lee <jonglin@google.com>
---
 arch/arm64/kernel/smp.c        |  3 +++
 drivers/android/vendor_hooks.c |  2 ++
 include/trace/hooks/debug.h    | 25 +++++++++++++++++++++++++
 3 files changed, 30 insertions(+)
 create mode 100644 include/trace/hooks/debug.h

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 82e75fc2c903..0e74a1552122 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -53,6 +53,8 @@
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/ipi.h>
+#undef CREATE_TRACE_POINTS
+#include <trace/hooks/debug.h>
 
 DEFINE_PER_CPU_READ_MOSTLY(int, cpu_number);
 EXPORT_PER_CPU_SYMBOL(cpu_number);
@@ -901,6 +903,7 @@ static void do_handle_IPI(int ipinr)
 		break;
 
 	case IPI_CPU_STOP:
+		trace_android_vh_ipi_stop(get_irq_regs());
 		local_cpu_stop();
 		break;
 
diff --git a/drivers/android/vendor_hooks.c b/drivers/android/vendor_hooks.c
index bf8d07920de5..85f867a76f1d 100644
--- a/drivers/android/vendor_hooks.c
+++ b/drivers/android/vendor_hooks.c
@@ -19,6 +19,7 @@
 #include <trace/hooks/mpam.h>
 #include <trace/hooks/gic.h>
 #include <trace/hooks/wqlockup.h>
+#include <trace/hooks/debug.h>
 
 /*
  * Export tracepoints that act as a bare tracehook (ie: have no trace event
@@ -59,3 +60,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mpam_set);
 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);
diff --git a/include/trace/hooks/debug.h b/include/trace/hooks/debug.h
new file mode 100644
index 000000000000..12ce5cf5e9a8
--- /dev/null
+++ b/include/trace/hooks/debug.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM debug
+
+#define TRACE_INCLUDE_PATH trace/hooks
+
+#if !defined(_TRACE_HOOK_DEBUG_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_HOOK_DEBUG_H
+
+#include <linux/tracepoint.h>
+#include <trace/hooks/vendor_hooks.h>
+
+#if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_ANDROID_VENDOR_HOOKS)
+struct pt_regs;
+
+DECLARE_HOOK(android_vh_ipi_stop,
+	TP_PROTO(struct pt_regs *regs),
+	TP_ARGS(regs))
+#else
+#define trace_android_vh_ipi_stop(regs)
+#endif
+
+#endif /* _TRACE_HOOK_DEBUG_H */
+/* This part must be outside protection */
+#include <trace/define_trace.h>