Commit 1218838d authored by Sergey Senozhatsky's avatar Sergey Senozhatsky Committed by Arnaldo Carvalho de Melo
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perf kvm: Add kvm-stat for arm64 



Add support for 'perf kvm stat' on arm64 platform.

Example:

  # perf kvm stat report

Analyze events for all VMs, all VCPUs:

    VM-EXIT    Samples  Samples%     Time%    Min Time    Max Time         Avg time

   DABT_LOW     661867    98.91%    40.45%      2.19us   3364.65us      6.24us ( +-   0.34% )
        IRQ       4598     0.69%    57.44%      2.89us   3397.59us   1276.27us ( +-   1.61% )
        WFx       1475     0.22%     1.71%      2.22us   3388.63us    118.31us ( +-   8.69% )
   IABT_LOW       1018     0.15%     0.38%      2.22us   2742.07us     38.29us ( +-  12.55% )
      SYS64        180     0.03%     0.01%      2.07us    112.91us      6.57us ( +-  14.95% )
      HVC64         17     0.00%     0.01%      2.19us    322.35us     42.95us ( +-  58.98% )

Total Samples:669155, Total events handled time:10216387.86us.

Signed-off-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: default avatarLeo Yan <leo.yan@linaro.org>
Tested-by: default avatarLeo Yan <leo.yan@linaro.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Suleiman Souhlal <suleiman@google.com>
Link: http://lore.kernel.org/lkml/20201027062421.463355-1-sergey.senozhatsky@gmail.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent ef0580ec

tools/perf/arch/arm64/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ PERF_HAVE_DWARF_REGS := 1 
endif

PERF_HAVE_JITDUMP := 1

PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1

HAVE_KVM_STAT_SUPPORT := 1



#

# Syscall table generation for perf

tools/perf/arch/arm64/util/Build

+1 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ perf-y += header.o 
perf-y += machine.o

perf-y += perf_regs.o

perf-y += tsc.o

perf-y += kvm-stat.o

perf-$(CONFIG_DWARF)     += dwarf-regs.o

perf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o

perf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o

tools/perf/arch/arm64/util/arm64_exception_types.h

0 → 100644
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Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#ifndef ARCH_PERF_ARM64_EXCEPTION_TYPES_H

#define ARCH_PERF_ARM64_EXCEPTION_TYPES_H



/* Per asm/virt.h */

#define HVC_STUB_ERR		  0xbadca11



/* Per asm/kvm_asm.h */

#define ARM_EXCEPTION_IRQ		0

#define ARM_EXCEPTION_EL1_SERROR	1

#define ARM_EXCEPTION_TRAP		2

#define ARM_EXCEPTION_IL		3

/* The hyp-stub will return this for any kvm_call_hyp() call */

#define ARM_EXCEPTION_HYP_GONE		HVC_STUB_ERR



#define kvm_arm_exception_type					\

	{ARM_EXCEPTION_IRQ,		"IRQ"		},	\

	{ARM_EXCEPTION_EL1_SERROR,	"SERROR"	},	\

	{ARM_EXCEPTION_TRAP,		"TRAP"		},	\

	{ARM_EXCEPTION_IL,		"ILLEGAL"	},	\

	{ARM_EXCEPTION_HYP_GONE,	"HYP_GONE"	}



/* Per asm/esr.h */

#define ESR_ELx_EC_UNKNOWN	(0x00)

#define ESR_ELx_EC_WFx		(0x01)

/* Unallocated EC: 0x02 */

#define ESR_ELx_EC_CP15_32	(0x03)

#define ESR_ELx_EC_CP15_64	(0x04)

#define ESR_ELx_EC_CP14_MR	(0x05)

#define ESR_ELx_EC_CP14_LS	(0x06)

#define ESR_ELx_EC_FP_ASIMD	(0x07)

#define ESR_ELx_EC_CP10_ID	(0x08)	/* EL2 only */

#define ESR_ELx_EC_PAC		(0x09)	/* EL2 and above */

/* Unallocated EC: 0x0A - 0x0B */

#define ESR_ELx_EC_CP14_64	(0x0C)

/* Unallocated EC: 0x0d */

#define ESR_ELx_EC_ILL		(0x0E)

/* Unallocated EC: 0x0F - 0x10 */

#define ESR_ELx_EC_SVC32	(0x11)

#define ESR_ELx_EC_HVC32	(0x12)	/* EL2 only */

#define ESR_ELx_EC_SMC32	(0x13)	/* EL2 and above */

/* Unallocated EC: 0x14 */

#define ESR_ELx_EC_SVC64	(0x15)

#define ESR_ELx_EC_HVC64	(0x16)	/* EL2 and above */

#define ESR_ELx_EC_SMC64	(0x17)	/* EL2 and above */

#define ESR_ELx_EC_SYS64	(0x18)

#define ESR_ELx_EC_SVE		(0x19)

#define ESR_ELx_EC_ERET		(0x1a)	/* EL2 only */

/* Unallocated EC: 0x1b - 0x1E */

#define ESR_ELx_EC_IMP_DEF	(0x1f)	/* EL3 only */

#define ESR_ELx_EC_IABT_LOW	(0x20)

#define ESR_ELx_EC_IABT_CUR	(0x21)

#define ESR_ELx_EC_PC_ALIGN	(0x22)

/* Unallocated EC: 0x23 */

#define ESR_ELx_EC_DABT_LOW	(0x24)

#define ESR_ELx_EC_DABT_CUR	(0x25)

#define ESR_ELx_EC_SP_ALIGN	(0x26)

/* Unallocated EC: 0x27 */

#define ESR_ELx_EC_FP_EXC32	(0x28)

/* Unallocated EC: 0x29 - 0x2B */

#define ESR_ELx_EC_FP_EXC64	(0x2C)

/* Unallocated EC: 0x2D - 0x2E */

#define ESR_ELx_EC_SERROR	(0x2F)

#define ESR_ELx_EC_BREAKPT_LOW	(0x30)

#define ESR_ELx_EC_BREAKPT_CUR	(0x31)

#define ESR_ELx_EC_SOFTSTP_LOW	(0x32)

#define ESR_ELx_EC_SOFTSTP_CUR	(0x33)

#define ESR_ELx_EC_WATCHPT_LOW	(0x34)

#define ESR_ELx_EC_WATCHPT_CUR	(0x35)

/* Unallocated EC: 0x36 - 0x37 */

#define ESR_ELx_EC_BKPT32	(0x38)

/* Unallocated EC: 0x39 */

#define ESR_ELx_EC_VECTOR32	(0x3A)	/* EL2 only */

/* Unallocated EC: 0x3B */

#define ESR_ELx_EC_BRK64	(0x3C)

/* Unallocated EC: 0x3D - 0x3F */

#define ESR_ELx_EC_MAX		(0x3F)



#define ECN(x) { ESR_ELx_EC_##x, #x }



#define kvm_arm_exception_class \

	ECN(UNKNOWN), ECN(WFx), ECN(CP15_32), ECN(CP15_64), ECN(CP14_MR), \

	ECN(CP14_LS), ECN(FP_ASIMD), ECN(CP10_ID), ECN(PAC), ECN(CP14_64), \

	ECN(SVC64), ECN(HVC64), ECN(SMC64), ECN(SYS64), ECN(SVE), \

	ECN(IMP_DEF), ECN(IABT_LOW), ECN(IABT_CUR), \

	ECN(PC_ALIGN), ECN(DABT_LOW), ECN(DABT_CUR), \

	ECN(SP_ALIGN), ECN(FP_EXC32), ECN(FP_EXC64), ECN(SERROR), \

	ECN(BREAKPT_LOW), ECN(BREAKPT_CUR), ECN(SOFTSTP_LOW), \

	ECN(SOFTSTP_CUR), ECN(WATCHPT_LOW), ECN(WATCHPT_CUR), \

	ECN(BKPT32), ECN(VECTOR32), ECN(BRK64)



#endif /* ARCH_PERF_ARM64_EXCEPTION_TYPES_H */

tools/perf/arch/arm64/util/kvm-stat.c

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// SPDX-License-Identifier: GPL-2.0

#include <errno.h>

#include <memory.h>

#include "../../util/evsel.h"

#include "../../util/kvm-stat.h"

#include "arm64_exception_types.h"

#include "debug.h"



define_exit_reasons_table(arm64_exit_reasons, kvm_arm_exception_type);

define_exit_reasons_table(arm64_trap_exit_reasons, kvm_arm_exception_class);



const char *kvm_trap_exit_reason = "esr_ec";

const char *vcpu_id_str = "id";

const int decode_str_len = 20;

const char *kvm_exit_reason = "ret";

const char *kvm_entry_trace = "kvm:kvm_entry";

const char *kvm_exit_trace = "kvm:kvm_exit";



const char *kvm_events_tp[] = {

	"kvm:kvm_entry",

	"kvm:kvm_exit",

	NULL,

};



static void event_get_key(struct evsel *evsel,

			  struct perf_sample *sample,

			  struct event_key *key)

{

	key->info = 0;

	key->key = evsel__intval(evsel, sample, kvm_exit_reason);

	key->exit_reasons = arm64_exit_reasons;



	/*

	 * TRAP exceptions carry exception class info in esr_ec field

	 * and, hence, we need to use a different exit_reasons table to

	 * properly decode event's est_ec.

	 */

	if (key->key == ARM_EXCEPTION_TRAP) {

		key->key = evsel__intval(evsel, sample, kvm_trap_exit_reason);

		key->exit_reasons = arm64_trap_exit_reasons;

	}

}



static bool event_begin(struct evsel *evsel,

			struct perf_sample *sample __maybe_unused,

			struct event_key *key __maybe_unused)

{

	return !strcmp(evsel->name, kvm_entry_trace);

}



static bool event_end(struct evsel *evsel,

		      struct perf_sample *sample,

		      struct event_key *key)

{

	if (!strcmp(evsel->name, kvm_exit_trace)) {

		event_get_key(evsel, sample, key);

		return true;

	}

	return false;

}



static struct kvm_events_ops exit_events = {

	.is_begin_event = event_begin,

	.is_end_event	= event_end,

	.decode_key	= exit_event_decode_key,

	.name		= "VM-EXIT"

};



struct kvm_reg_events_ops kvm_reg_events_ops[] = {

	{

		.name	= "vmexit",

		.ops	= &exit_events,

	},

	{ NULL },

};



const char * const kvm_skip_events[] = {

	NULL,

};



int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)

{

	kvm->exit_reasons_isa = "arm64";

	return 0;

}