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Commit 8f249566 authored by Ashwin Chaugule's avatar Ashwin Chaugule Committed by Neil Leeder
Browse files

Perf: Add L1 counters to tracepoints 



Create a new tracepoint to get L1 PMU counter
information at every context switch. Counters
are captured only when the tracepoint is enabled
via perf or ftrace.

Change-Id: If05527b29e04c700170cfdf9f88d300b2f558ffa
Signed-off-by: default avatarAshwin Chaugule <ashwinc@codeaurora.org>
parent 179b553f

arch/arm/mach-msm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ endif 


obj-y += acpuclock.o

obj-$(CONFIG_ARCH_MSM_KRAIT) += clock-krait.o

obj-$(CONFIG_HW_PERF_EVENTS) += perf_trace_counters.o

obj-$(CONFIG_ARCH_MSM7X27) += acpuclock-7627.o acpuclock-8625q.o clock-pll.o

obj-$(CONFIG_ARCH_MSM_KRAIT) += msm-krait-l2-accessors.o perf_event_msm_krait_l2.o

obj-$(CONFIG_ARCH_MSM_KRAIT) += krait-scm.o

arch/arm/mach-msm/perf_debug.c

+1 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ static char *descriptions = 
	" 4 Perf: Support sw events across hotplug\n"

	" 5 msm: perf: initialise krait perf L2 counter enables\n"

	" 6 msm: perf: clean up duplicate constraint events\n"

	" 7 Perf: Add L1 counters to tracepoints\n"

;



static ssize_t desc_read(struct file *fp, char __user *buf,

arch/arm/mach-msm/perf_trace_counters.c

0 → 100644
+42 −0
Original line number Diff line number Diff line 
/* Copyright (c) 2013, 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.

 */

#include <asm/thread_notify.h>

#define CREATE_TRACE_POINTS

#include "perf_trace_counters.h"



static int tracectr_notifier(struct notifier_block *self, unsigned long cmd,

		void *v)

{

	static int old_pid = -1;

	struct thread_info *thread = v;

	int current_pid;



	if (cmd != THREAD_NOTIFY_SWITCH)

		return old_pid;



	current_pid = thread->task->pid;

	if (old_pid != -1)

		trace_sched_switch_with_ctrs(old_pid, current_pid);

	old_pid = current_pid;

	return old_pid;

}



static struct notifier_block tracectr_notifier_block = {

	.notifier_call  = tracectr_notifier,

};



int __init init_tracecounters(void)

{

	thread_register_notifier(&tracectr_notifier_block);

	return 0;

}

late_initcall(init_tracecounters);

arch/arm/mach-msm/perf_trace_counters.h

0 → 100644
+126 −0
Original line number Diff line number Diff line 
/* Copyright (c) 2013, 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 perf_trace_counters



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

#define _PERF_TRACE_COUNTERS_H_



/* Ctr index for PMCNTENSET/CLR */

#define CC 0x80000000

#define C0 0x1

#define C1 0x10

#define C2 0x100

#define C3 0x1000





#include <linux/sched.h>

#include <linux/tracepoint.h>



TRACE_EVENT(sched_switch_with_ctrs,



		TP_PROTO(pid_t prev, pid_t next),



		TP_ARGS(prev, next),



		TP_STRUCT__entry(

			__field(pid_t,	old_pid)

			__field(pid_t,	new_pid)

			__field(u32, cctr)

			__field(u32, ctr0)

			__field(u32, ctr1)

			__field(u32, ctr2)

			__field(u32, ctr3)

		),



		TP_fast_assign(

			__entry->old_pid	= prev;

			__entry->new_pid	= next;



			/* cycle counter */

			/* Disable */

			asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r"(CC));

			/* Read value */

			asm volatile("mrc p15, 0, %0, c9, c13, 0"

				: "=r"(__entry->cctr));

			/* Reset */

			asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r"(0));

			/* Enable */

			asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r"(CC));



			/* ctr 0 */

			/* Disable */

			asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r"(C0));

			/* Select */

			asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r"(0));

			/* Read value */

			asm volatile("mrc p15, 0, %0, c9, c13, 2"

					: "=r"(__entry->ctr0));

			/* Reset */

			asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r"(0));

			/* Enable */

			asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r"(C0));



			/* ctr 1 */

			/* Disable */

			asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r"(C1));

			/* Select */

			asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r"(1));

			/* Read value */

			asm volatile("mrc p15, 0, %0, c9, c13, 2"

					: "=r"(__entry->ctr1));

			/* Reset */

			asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r"(0));

			/* Enable */

			asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r"(C1));



			/* ctr 2 */

			/* Disable */

			asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r"(C2));

			/* Select */

			asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r"(2));

			/* Read value */

			asm volatile("mrc p15, 0, %0, c9, c13, 2"

					: "=r"(__entry->ctr2));

			/* Reset */

			asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r"(0));

			/* Enable */

			asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r"(C2));



			/* ctr 3 */

			/* Disable */

			asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r"(C3));

			/* Select */

			asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r"(3));

			/* Read value */

			asm volatile("mrc p15, 0, %0, c9, c13, 2"

					: "=r"(__entry->ctr3));

			/* Reset */

			asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r"(0));

			/* Enable */

			asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r"(C3));



		),



		TP_printk("prev_pid=%d, next_pid=%d, CCNTR: %u, CTR0: %u, CTR1: %u, CTR2: %u, CTR3: %u",

				__entry->old_pid, __entry->new_pid,

				__entry->cctr, __entry->ctr0, __entry->ctr1,

				__entry->ctr2, __entry->ctr3)

);



#endif

#undef TRACE_INCLUDE_PATH

#define TRACE_INCLUDE_PATH ../../arch/arm/mach-msm

#define TRACE_INCLUDE_FILE perf_trace_counters

#include <trace/define_trace.h>