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Commit e079b2b2 authored by Srinivas Ramana's avatar Srinivas Ramana Committed by Gerrit - the friendly Code Review server
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msm: rtb: record counter timestamp for every log record 



Record counter timestamp in every RTB log record to help
correlate these events with other subsystem events which
occur outside of cpu subsystem.

Change-Id: Ib1291524c53c4ec757a494a1e08cb0925720e1a6
Signed-off-by: default avatarSrinivas Ramana <sramana@codeaurora.org>
parent c1b67407

kernel/trace/msm_rtb.c

+11 −2
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.

 * Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -27,6 +27,7 @@ 
#include <linux/io.h>

#include <asm-generic/sizes.h>

#include <linux/msm_rtb.h>

#include <asm/timex.h>



#define SENTINEL_BYTE_1 0xFF

#define SENTINEL_BYTE_2 0xAA
@@ -41,8 +42,9 @@ 
 * 4) 4 bytes index

 * 4) 8 bytes extra data from the caller

 * 5) 8 bytes of timestamp

 * 6) 8 bytes of cyclecount

 *

 * Total = 32 bytes.

 * Total = 40 bytes.

 */

struct msm_rtb_layout {

	unsigned char sentinel[3];
@@ -51,6 +53,7 @@ struct msm_rtb_layout { 
	uint64_t caller;

	uint64_t data;

	uint64_t timestamp;

	uint64_t cycle_count;

} __attribute__ ((__packed__));
@@ -132,6 +135,11 @@ static void msm_rtb_write_timestamp(struct msm_rtb_layout *start) 
	start->timestamp = sched_clock();

}



static void msm_rtb_write_cyclecount(struct msm_rtb_layout *start)

{

	start->cycle_count = get_cycles();

}



static void uncached_logk_pc_idx(enum logk_event_type log_type, uint64_t caller,

				 uint64_t data, int idx)

{
@@ -145,6 +153,7 @@ static void uncached_logk_pc_idx(enum logk_event_type log_type, uint64_t caller, 
	msm_rtb_write_idx(idx, start);

	msm_rtb_write_data(data, start);

	msm_rtb_write_timestamp(start);

	msm_rtb_write_cyclecount(start);

	mb();



	return;