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Commit bad091cc authored by Changki Kim's avatar Changki Kim Committed by Todd Kjos
Browse files

ANDROID: vendor_hooks: Add vendor hooks for getting printk messages 



When sudden reset by watchdog occurs, kernel log is very helpful.
But the log has saved structure type in log_buf.
So we want to collect the log on runtime to string format at other
reserved memory.

Bug: 167766040

Change-Id: Ic9686acc7c284e2ab81395fb9cc076fafe142bf9
Signed-off-by: default avatarChangki Kim <changki.kim@samsung.com>
parent 8a8be5c0

drivers/android/vendor_hooks.c

+1 −0
Original line number Diff line number Diff line
@@ -55,3 +55,4 @@ 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);

EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_printk_store);

include/trace/hooks/debug.h

+5 −0
Original line number Diff line number Diff line
@@ -15,8 +15,13 @@ struct pt_regs; 
DECLARE_HOOK(android_vh_ipi_stop,

	TP_PROTO(struct pt_regs *regs),

	TP_ARGS(regs))



DECLARE_HOOK(android_vh_printk_store,

	TP_PROTO(int facility, int level),

	TP_ARGS(facility, level))

#else

#define trace_android_vh_ipi_stop(regs)

#define trace_android_vh_printk_store(facility, level)

#endif



#endif /* _TRACE_HOOK_DEBUG_H */

kernel/printk/printk.c

+3 −0
Original line number Diff line number Diff line
@@ -55,6 +55,8 @@ 
#include <trace/events/initcall.h>

#define CREATE_TRACE_POINTS

#include <trace/events/printk.h>

#undef CREATE_TRACE_POINTS

#include <trace/hooks/debug.h>



#include "console_cmdline.h"

#include "braille.h"
@@ -2007,6 +2009,7 @@ asmlinkage int vprintk_emit(int facility, int level, 
	pending_output = (curr_log_seq != log_next_seq);

	logbuf_unlock_irqrestore(flags);



	trace_android_vh_printk_store(facility, level);

	/* If called from the scheduler, we can not call up(). */

	if (!in_sched && pending_output) {

		/*