Commit 6480c561 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

Merge tag 'perf-core-for-mingo' of... 

Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf

 into perf/core

Pull perf/core improvements and fixes from Jiri Olsa:

  * Add libdw DWARF post unwind support for ARM (Jean Pihet)

  * Consolidate types.h for ARM and ARM64 (Jean Pihet)

  * Fix possible null pointer dereference in session.c (Masanari Iida)

  * Cleanup, remove unused variables in map_switch_event() (Dongsheng Yang)

  * Remove nr_state_machine_bugs in perf latency (Dongsheng Yang)

  * Remove usage of trace_sched_wakeup(.success) (Peter Zijlstra)

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parents 722e76e6 97eac381

tools/perf/Makefile.perf

+1 −1
Original line number Diff line number Diff line
@@ -411,7 +411,7 @@ LIB_OBJS += $(OUTPUT)tests/code-reading.o 
LIB_OBJS += $(OUTPUT)tests/sample-parsing.o

LIB_OBJS += $(OUTPUT)tests/parse-no-sample-id-all.o

ifndef NO_DWARF_UNWIND

ifeq ($(ARCH),x86)

ifeq ($(ARCH),$(filter $(ARCH),x86 arm))

LIB_OBJS += $(OUTPUT)tests/dwarf-unwind.o

endif

endif

tools/perf/arch/arm/Makefile

+7 −0
Original line number Diff line number Diff line
@@ -5,3 +5,10 @@ endif 
ifndef NO_LIBUNWIND

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o

endif

ifndef NO_LIBDW_DWARF_UNWIND

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libdw.o

endif

ifndef NO_DWARF_UNWIND

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/dwarf-unwind.o

endif

tools/perf/arch/arm/include/perf_regs.h

+6 −1
Original line number Diff line number Diff line
@@ -2,10 +2,15 @@ 
#define ARCH_PERF_REGS_H



#include <stdlib.h>

#include "../../util/types.h"

#include <linux/types.h>

#include <asm/perf_regs.h>



void perf_regs_load(u64 *regs);



#define PERF_REGS_MASK	((1ULL << PERF_REG_ARM_MAX) - 1)

#define PERF_REGS_MAX	PERF_REG_ARM_MAX

#define PERF_SAMPLE_REGS_ABI	PERF_SAMPLE_REGS_ABI_32



#define PERF_REG_IP	PERF_REG_ARM_PC

#define PERF_REG_SP	PERF_REG_ARM_SP

tools/perf/arch/arm/tests/dwarf-unwind.c

0 → 100644
+60 −0
Original line number Diff line number Diff line 
#include <string.h>

#include "perf_regs.h"

#include "thread.h"

#include "map.h"

#include "event.h"

#include "tests/tests.h"



#define STACK_SIZE 8192



static int sample_ustack(struct perf_sample *sample,

			 struct thread *thread, u64 *regs)

{

	struct stack_dump *stack = &sample->user_stack;

	struct map *map;

	unsigned long sp;

	u64 stack_size, *buf;



	buf = malloc(STACK_SIZE);

	if (!buf) {

		pr_debug("failed to allocate sample uregs data\n");

		return -1;

	}



	sp = (unsigned long) regs[PERF_REG_ARM_SP];



	map = map_groups__find(thread->mg, MAP__VARIABLE, (u64) sp);

	if (!map) {

		pr_debug("failed to get stack map\n");

		free(buf);

		return -1;

	}



	stack_size = map->end - sp;

	stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;



	memcpy(buf, (void *) sp, stack_size);

	stack->data = (char *) buf;

	stack->size = stack_size;

	return 0;

}



int test__arch_unwind_sample(struct perf_sample *sample,

			     struct thread *thread)

{

	struct regs_dump *regs = &sample->user_regs;

	u64 *buf;



	buf = calloc(1, sizeof(u64) * PERF_REGS_MAX);

	if (!buf) {

		pr_debug("failed to allocate sample uregs data\n");

		return -1;

	}



	perf_regs_load(buf);

	regs->abi  = PERF_SAMPLE_REGS_ABI;

	regs->regs = buf;

	regs->mask = PERF_REGS_MASK;



	return sample_ustack(sample, thread, buf);

}

tools/perf/arch/arm/tests/regs_load.S

0 → 100644
+58 −0
Original line number Diff line number Diff line 
#include <linux/linkage.h>



#define R0 0x00

#define R1 0x08

#define R2 0x10

#define R3 0x18

#define R4 0x20

#define R5 0x28

#define R6 0x30

#define R7 0x38

#define R8 0x40

#define R9 0x48

#define SL 0x50

#define FP 0x58

#define IP 0x60

#define SP 0x68

#define LR 0x70

#define PC 0x78



/*

 * Implementation of void perf_regs_load(u64 *regs);

 *

 * This functions fills in the 'regs' buffer from the actual registers values,

 * in the way the perf built-in unwinding test expects them:

 * - the PC at the time at the call to this function. Since this function

 *   is called using a bl instruction, the PC value is taken from LR.

 * The built-in unwinding test then unwinds the call stack from the dwarf

 * information in unwind__get_entries.

 *

 * Notes:

 * - the 8 bytes stride in the registers offsets comes from the fact

 * that the registers are stored in an u64 array (u64 *regs),

 * - the regs buffer needs to be zeroed before the call to this function,

 * in this case using a calloc in dwarf-unwind.c.

 */



.text

.type perf_regs_load,%function

ENTRY(perf_regs_load)

	str r0, [r0, #R0]

	str r1, [r0, #R1]

	str r2, [r0, #R2]

	str r3, [r0, #R3]

	str r4, [r0, #R4]

	str r5, [r0, #R5]

	str r6, [r0, #R6]

	str r7, [r0, #R7]

	str r8, [r0, #R8]

	str r9, [r0, #R9]

	str sl, [r0, #SL]

	str fp, [r0, #FP]

	str ip, [r0, #IP]

	str sp, [r0, #SP]

	str lr, [r0, #LR]

	str lr, [r0, #PC]	// store pc as lr in order to skip the call

	                        //  to this function

	mov pc, lr

ENDPROC(perf_regs_load)

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