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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: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Leo 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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Sergey Senozhatsky 2020-10-27 15:24:21 +09:00 committed by Arnaldo Carvalho de Melo
parent ef0580ecd8
commit 1218838d68
4 changed files with 179 additions and 0 deletions
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1
tools/perf/arch/arm64/Makefile
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@ -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

1
tools/perf/arch/arm64/util/Build
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@ -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

92
tools/perf/arch/arm64/util/arm64_exception_types.h Normal file
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@ -0,0 +1,92 @@
// 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 */

85
tools/perf/arch/arm64/util/kvm-stat.c Normal file
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@ -0,0 +1,85 @@
// 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;
}