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Commit edc10dd6 authored by Alok Chauhan's avatar Alok Chauhan
Browse files

msm: msm_bus: Log Bus client request transitions 



Use kernel's ftrace support to capture bus client request
transitions which are useful for debugging issues related
to power consumption.
Usage:

mount -t debugfs none /sys/kernel/debug
echo 1 > /sys/kernel/debug/tracing/events/msm_bus/
	bus_update_request/enable
cat /sys/kernel/debug/tracing/trace_pipe

CRs-Fixed: 622642
Change-Id: I9bd9eab8338c661ea170250a321eac7e40540fa6
Signed-off-by: default avatarAlok Chauhan <alokc@codeaurora.org>
parent 4c52f3c7

arch/arm/mach-msm/include/mach/trace_msm_bus.h

0 → 100644
+65 −0
Original line number Diff line number Diff line 
/* Copyright (c) 2014, 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

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



#undef TRACE_SYSTEM

#define TRACE_SYSTEM msm_bus



#if !defined(_TRACE_MSM_BUS_H) || defined(TRACE_HEADER_MULTI_READ)

#define _TRACE_MSM_BUS_H



#include <linux/tracepoint.h>



TRACE_EVENT(bus_update_request,



	TP_PROTO(int sec, int nsec, const char *name, unsigned int index,

		int src, int dest, unsigned long long ab,

		unsigned long long ib),



	TP_ARGS(sec, nsec, name, index, src, dest, ab, ib),



	TP_STRUCT__entry(

		__field(int, sec)

		__field(int, nsec)

		__string(name, name)

		__field(u32, index)

		__field(int, src)

		__field(int, dest)

		__field(u64, ab)

		__field(u64, ib)

	),



	TP_fast_assign(

		__entry->sec = sec;

		__entry->nsec = nsec;

		__assign_str(name, name);

		__entry->index = index;

		__entry->src = src;

		__entry->dest = dest;

		__entry->ab = ab;

		__entry->ib = ib;

	),



	TP_printk("time= %d.%d name=%s index=%u src=%d dest=%d ab=%llu ib=%llu",

		__entry->sec,

		__entry->nsec,

		__get_str(name),

		(unsigned int)__entry->index,

		__entry->src,

		__entry->dest,

		(unsigned long long)__entry->ab,

		(unsigned long long)__entry->ib)

);

#endif

#undef TRACE_INCLUDE_PATH

#define TRACE_INCLUDE_PATH mach

#define TRACE_INCLUDE_FILE trace_msm_bus

#include <trace/define_trace.h>

drivers/platform/msm/msm_bus/msm_bus_dbg.c

+12 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.

/* Copyright (c) 2010-2012, 2014, 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
@@ -26,6 +26,9 @@ 
#include <linux/msm-bus.h>

#include "msm_bus_core.h"



#define CREATE_TRACE_POINTS

#include <mach/trace_msm_bus.h>



#define MAX_BUFF_SIZE 4096

#define FILL_LIMIT 128
@@ -406,6 +409,14 @@ static int msm_bus_dbg_fill_cl_buffer(const struct msm_bus_scale_pdata *pdata, 
			pdata->usecase[index].vectors[j].ib);

	i += scnprintf(buf + i, MAX_BUFF_SIZE - i, "\n");



	for (j = 0; j < pdata->usecase->num_paths; j++)

		trace_bus_update_request((int)ts.tv_sec, (int)ts.tv_nsec,

		pdata->name, index,

		pdata->usecase[index].vectors[j].src,

		pdata->usecase[index].vectors[j].dst,

		pdata->usecase[index].vectors[j].ab,

		pdata->usecase[index].vectors[j].ib);



	cldata->size = i;

	return i;

}