Commit 6c6bd754 authored by Brian Rogan's avatar Brian Rogan Committed by Paul Mackerras
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[PATCH] powerpc: Add oprofile calltrace support 



Add oprofile calltrace support to powerpc. Disable spinlock backtracing
now we can use calltrace info.

(Updated to work on both 32bit and 64bit by me).

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent b848e0a0

arch/powerpc/oprofile/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -6,7 +6,7 @@ DRIVER_OBJS := $(addprefix ../../../drivers/oprofile/, \ 
		oprofilefs.o oprofile_stats.o \

		timer_int.o )



oprofile-y := $(DRIVER_OBJS) common.o

oprofile-y := $(DRIVER_OBJS) common.o backtrace.o

oprofile-$(CONFIG_PPC64) += op_model_rs64.o op_model_power4.o

oprofile-$(CONFIG_FSL_BOOKE) += op_model_fsl_booke.o

oprofile-$(CONFIG_PPC32) += op_model_7450.o

arch/powerpc/oprofile/backtrace.c

0 → 100644
+126 −0
Original line number Diff line number Diff line 
/**

 * Copyright (C) 2005 Brian Rogan <bcr6@cornell.edu>, IBM

 *

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

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

**/



#include <linux/oprofile.h>

#include <linux/sched.h>

#include <asm/processor.h>

#include <asm/uaccess.h>



#define STACK_SP(STACK)		*(STACK)



#define STACK_LR64(STACK)	*((unsigned long *)(STACK) + 2)

#define STACK_LR32(STACK)	*((unsigned int *)(STACK) + 1)



#ifdef CONFIG_PPC64

#define STACK_LR(STACK)		STACK_LR64(STACK)

#else

#define STACK_LR(STACK)		STACK_LR32(STACK)

#endif



static unsigned int user_getsp32(unsigned int sp, int is_first)

{

	unsigned int stack_frame[2];



	if (!access_ok(VERIFY_READ, sp, sizeof(stack_frame)))

		return 0;



	/*

	 * The most likely reason for this is that we returned -EFAULT,

	 * which means that we've done all that we can do from

	 * interrupt context.

	 */

	if (__copy_from_user_inatomic(stack_frame, (void *)(long)sp,

					sizeof(stack_frame)))

		return 0;



	if (!is_first)

		oprofile_add_trace(STACK_LR32(stack_frame));



	/*

	 * We do not enforce increasing stack addresses here because

	 * we may transition to a different stack, eg a signal handler.

	 */

	return STACK_SP(stack_frame);

}



#ifdef CONFIG_PPC64

static unsigned long user_getsp64(unsigned long sp, int is_first)

{

	unsigned long stack_frame[3];



	if (!access_ok(VERIFY_READ, sp, sizeof(stack_frame)))

		return 0;



	if (__copy_from_user_inatomic(stack_frame, (void *)sp,

					sizeof(stack_frame)))

		return 0;



	if (!is_first)

		oprofile_add_trace(STACK_LR64(stack_frame));



	return STACK_SP(stack_frame);

}

#endif



static unsigned long kernel_getsp(unsigned long sp, int is_first)

{

	unsigned long *stack_frame = (unsigned long *)sp;



	if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD))

		return 0;



	if (!is_first)

		oprofile_add_trace(STACK_LR(stack_frame));



	/*

	 * We do not enforce increasing stack addresses here because

	 * we might be transitioning from an interrupt stack to a kernel

	 * stack. validate_sp() is designed to understand this, so just

	 * use it.

	 */

	return STACK_SP(stack_frame);

}



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

{

	unsigned long sp = regs->gpr[1];

	int first_frame = 1;



	/* We ditch the top stackframe so need to loop through an extra time */

	depth += 1;



	if (!user_mode(regs)) {

		while (depth--) {

			sp = kernel_getsp(sp, first_frame);

			if (!sp)

				break;

			first_frame = 0;

		}

	} else {

#ifdef CONFIG_PPC64

		if (!test_thread_flag(TIF_32BIT)) {

			while (depth--) {

				sp = user_getsp64(sp, first_frame);

				if (!sp)

					break;

				first_frame = 0;

			}



			return;

		}

#endif



		while (depth--) {

			sp = user_getsp32(sp, first_frame);

			if (!sp)

				break;

			first_frame = 0;

		}

	}

}

arch/powerpc/oprofile/common.c

+2 −2
Original line number Diff line number Diff line
@@ -126,8 +126,7 @@ static int op_powerpc_create_files(struct super_block *sb, struct dentry *root) 
	sys.enable_kernel = 1;

	sys.enable_user = 1;

#ifdef CONFIG_PPC64

	/* Turn on backtracing through spinlocks by default */

	sys.backtrace_spinlocks = 1;

	sys.backtrace_spinlocks = 0;

#endif



	return 0;
@@ -168,6 +167,7 @@ int __init oprofile_arch_init(struct oprofile_operations *ops) 
	ops->shutdown = op_powerpc_shutdown;

	ops->start = op_powerpc_start;

	ops->stop = op_powerpc_stop;

	ops->backtrace = op_powerpc_backtrace;



	printk(KERN_INFO "oprofile: using %s performance monitoring.\n",

	       ops->cpu_type);

arch/powerpc/oprofile/op_model_power4.c

+1 −1
Original line number Diff line number Diff line
@@ -293,7 +293,7 @@ static void power4_handle_interrupt(struct pt_regs *regs, 
		val = ctr_read(i);

		if (val < 0) {

			if (oprofile_running && ctr[i].enabled) {

				oprofile_add_pc(pc, is_kernel, i);

				oprofile_add_ext_sample(pc, regs, i, is_kernel);

				ctr_write(i, reset_value[i]);

			} else {

				ctr_write(i, 0);

include/asm-powerpc/oprofile_impl.h

+2 −0
Original line number Diff line number Diff line
@@ -126,5 +126,7 @@ static inline void ctr_write(unsigned int i, unsigned int val) 
}

#endif /* !CONFIG_FSL_BOOKE */



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



#endif /* __KERNEL__ */

#endif /* _ASM_POWERPC_OPROFILE_IMPL_H */