From 55ff3b05bf34f809e21b27ca9d156ac6f7c4b745 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: I21c74fe0d047e49b676c502bc9b8d8830e5431de
Signed-off-by: Changki Kim <changki.kim@samsung.com>
---
 arch/arm64/kernel/smp.c        |  3 +++
 drivers/android/vendor_hooks.c |  2 ++
 include/trace/hooks/debug.h    | 24 ++++++++++++++++++++++++
 3 files changed, 29 insertions(+)
 create mode 100644 include/trace/hooks/debug.h

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 038ce6263d1c..d928271934e9 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);
@@ -899,6 +901,7 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
 		break;
 
 	case IPI_CPU_STOP:
+		trace_android_vh_ipi_stop(regs);
 		irq_enter();
 		local_cpu_stop();
 		irq_exit();
diff --git a/drivers/android/vendor_hooks.c b/drivers/android/vendor_hooks.c
index efaee731f592..7b4b1abbb537 100644
--- a/drivers/android/vendor_hooks.c
+++ b/drivers/android/vendor_hooks.c
@@ -16,6 +16,7 @@
 #include <trace/hooks/futex.h>
 #include <trace/hooks/fpsimd.h>
 #include <trace/hooks/topology.h>
+#include <trace/hooks/debug.h>
 
 /*
  * Export tracepoints that act as a bare tracehook (ie: have no trace event
@@ -53,3 +54,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_write_finished);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alter_rwsem_list_add);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alter_futex_plist_add);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_is_fpsimd_save);
+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..d3e310ec4b2d
--- /dev/null
+++ b/include/trace/hooks/debug.h
@@ -0,0 +1,24 @@
+/* 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)
+
+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>