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Commit 00e6c923 authored by James Hogan's avatar James Hogan
Browse files

metag: OProfile support 



Add OProfile support for metag, using the perf backend, and falling back
to generic timer based sampling if perf counter interrupt support is
disabled.

The oprofile code prepends "metag/" to the perf pmu name to give
"metag/meta2" which is more consistent with other oprofile arch names.

The backtrace code makes use of <asm/stacktrace.h> for kernel
backtracing, and a simple frame pointer walk for userland backtracing.

Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: Robert Richter <rric@kernel.org>
Cc: oprofile-list@lists.sf.net
parent f27086f5

arch/metag/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ config METAG 
	select HAVE_MEMBLOCK

	select HAVE_MEMBLOCK_NODE_MAP

	select HAVE_MOD_ARCH_SPECIFIC

	select HAVE_OPROFILE

	select HAVE_PERF_EVENTS

	select HAVE_SYSCALL_TRACEPOINTS

	select IRQ_DOMAIN
@@ -209,6 +210,9 @@ config METAG_PERFCOUNTER_IRQS 
	  When disabled, Performance Counters information will be collected

	  based on Timer Interrupt.



config HW_PERF_EVENTS

	def_bool METAG_PERFCOUNTER_IRQS && PERF_EVENTS



config METAG_DA

	bool "DA support"

	help

arch/metag/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -49,6 +49,8 @@ core-y += arch/metag/mm/ 
libs-y					+= arch/metag/lib/

libs-y					+= arch/metag/tbx/



drivers-$(CONFIG_OPROFILE)		+= arch/metag/oprofile/



boot					:= arch/metag/boot



boot_targets				+= uImage

arch/metag/oprofile/Makefile

0 → 100644
+17 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_OPROFILE)	+= oprofile.o



oprofile-core-y	+= buffer_sync.o

oprofile-core-y	+= cpu_buffer.o

oprofile-core-y	+= event_buffer.o

oprofile-core-y	+= oprof.o

oprofile-core-y	+= oprofile_files.o

oprofile-core-y	+= oprofile_stats.o

oprofile-core-y	+= oprofilefs.o

oprofile-core-y	+= timer_int.o

oprofile-core-$(CONFIG_HW_PERF_EVENTS)	+= oprofile_perf.o



oprofile-y	+= backtrace.o

oprofile-y	+= common.o

oprofile-y	+= $(addprefix ../../../drivers/oprofile/,$(oprofile-core-y))



ccflags-y	+= -Werror

arch/metag/oprofile/backtrace.c

0 → 100644
+63 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2010-2013 Imagination Technologies Ltd.

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 */



#include <linux/oprofile.h>

#include <linux/uaccess.h>

#include <asm/processor.h>

#include <asm/stacktrace.h>



#include "backtrace.h"



static void user_backtrace_fp(unsigned long __user *fp, unsigned int depth)

{

	while (depth-- && access_ok(VERIFY_READ, fp, 8)) {

		unsigned long addr;

		unsigned long __user *fpnew;

		if (__copy_from_user_inatomic(&addr, fp + 1, sizeof(addr)))

			break;

		addr -= 4;



		oprofile_add_trace(addr);



		/* stack grows up, so frame pointers must decrease */

		if (__copy_from_user_inatomic(&fpnew, fp + 0, sizeof(fpnew)))

			break;

		if (fpnew >= fp)

			break;

		fp = fpnew;

	}

}



static int kernel_backtrace_frame(struct stackframe *frame, void *data)

{

	unsigned int *depth = data;



	oprofile_add_trace(frame->pc);



	/* decrement depth and stop if we reach 0 */

	if ((*depth)-- == 0)

		return 1;



	/* otherwise onto the next frame */

	return 0;

}



void metag_backtrace(struct pt_regs * const regs, unsigned int depth)

{

	if (user_mode(regs)) {

		unsigned long *fp = (unsigned long *)regs->ctx.AX[1].U0;

		user_backtrace_fp((unsigned long __user __force *)fp, depth);

	} else {

		struct stackframe frame;

		frame.fp = regs->ctx.AX[1].U0;		/* A0FrP */

		frame.sp = user_stack_pointer(regs);	/* A0StP */

		frame.lr = 0;				/* from stack */

		frame.pc = regs->ctx.CurrPC;		/* PC */

		walk_stackframe(&frame, &kernel_backtrace_frame, &depth);

	}

}

arch/metag/oprofile/backtrace.h

0 → 100644
+6 −0
Original line number Diff line number Diff line 
#ifndef _METAG_OPROFILE_BACKTRACE_H

#define _METAG_OPROFILE_BACKTRACE_H



void metag_backtrace(struct pt_regs * const regs, unsigned int depth);



#endif