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perf kvm: Add kvm-stat for loongarch64 

commit 492ac37fa38f ("perf kvm: Add kvm-stat for loongarch64")
Conflict: none
Backport-reason: Synchronize upstream linux loongarch kvm
patch to support loongarch virtualization.
Checkpatch: no, to be consistent with upstream commit.

Add support for 'perf kvm stat' on loongarch64 platform, now only kvm
exit event is supported.

Here is example output about "perf kvm --host stat report" command

   Event name   Samples   Sample%     Time (ns)   Time%   Mean Time (ns)
    Mem Store     83969    51.00%     625697070   8.00%             7451
     Mem Read     37641    22.00%     112485730   1.00%             2988
    Interrupt     15542     9.00%      20620190   0.00%             1326
        IOCSR     15207     9.00%      94296190   1.00%             6200
    Hypercall      4873     2.00%      12265280   0.00%             2516
         Idle      3713     2.00%    6322055860  87.00%          1702681
          FPU      1819     1.00%       2750300   0.00%             1511
   Inst Fetch       502     0.00%       1341740   0.00%             2672
   Mem Modify       324     0.00%        602240   0.00%             1858
       CPUCFG        55     0.00%         77610   0.00%             1411
          CSR        12     0.00%         19690   0.00%             1640
         LASX         3     0.00%          4870   0.00%             1623
          LSX         2     0.00%          2100   0.00%             1050

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
This commit is contained in:
Bibo Mao 2024-07-10 16:50:27 +08:00 committed by Xianglai Li
parent c555314c68
commit f4a7ec4613
4 changed files with 238 additions and 0 deletions
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1
tools/perf/arch/loongarch/Makefile
View File

@ -4,6 +4,7 @@ PERF_HAVE_DWARF_REGS := 1
endif
PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1
PERF_HAVE_JITDUMP := 1
HAVE_KVM_STAT_SUPPORT := 1
#
# Syscall table generation for perf

2
tools/perf/arch/loongarch/util/Build
View File

@ -1,5 +1,7 @@
perf-y += header.o
perf-y += perf_regs.o
perf-$(CONFIG_DWARF) += dwarf-regs.o
perf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
perf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
perf-$(CONFIG_LIBTRACEEVENT) += kvm-stat.o

96
tools/perf/arch/loongarch/util/header.c Normal file
View File

@ -0,0 +1,96 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Implementation of get_cpuid().
*
* Author: Nikita Shubin <n.shubin@yadro.com>
* Bibo Mao <maobibo@loongson.cn>
* Huacai Chen <chenhuacai@loongson.cn>
*/
#include <stdio.h>
#include <stdlib.h>
#include <api/fs/fs.h>
#include <errno.h>
#include "util/debug.h"
#include "util/header.h"
/*
* Output example from /proc/cpuinfo
* CPU Family : Loongson-64bit
* Model Name : Loongson-3C5000
* CPU Revision : 0x10
* FPU Revision : 0x01
*/
#define CPUINFO_MODEL "Model Name"
#define CPUINFO "/proc/cpuinfo"
static char *_get_field(const char *line)
{
char *line2, *nl;
line2 = strrchr(line, ' ');
if (!line2)
return NULL;
line2++;
nl = strrchr(line, '\n');
if (!nl)
return NULL;
return strndup(line2, nl - line2);
}
static char *_get_cpuid(void)
{
unsigned long line_sz;
char *line, *model, *cpuid;
FILE *file;
file = fopen(CPUINFO, "r");
if (file == NULL)
return NULL;
line = model = cpuid = NULL;
while (getline(&line, &line_sz, file) != -1) {
if (strncmp(line, CPUINFO_MODEL, strlen(CPUINFO_MODEL)))
continue;
model = _get_field(line);
if (!model)
goto out_free;
break;
}
if (model && (asprintf(&cpuid, "%s", model) < 0))
cpuid = NULL;
out_free:
fclose(file);
free(model);
return cpuid;
}
int get_cpuid(char *buffer, size_t sz)
{
int ret = 0;
char *cpuid = _get_cpuid();
if (!cpuid)
return EINVAL;
if (sz < strlen(cpuid)) {
ret = ENOBUFS;
goto out_free;
}
scnprintf(buffer, sz, "%s", cpuid);
out_free:
free(cpuid);
return ret;
}
char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
{
return _get_cpuid();
}

139
tools/perf/arch/loongarch/util/kvm-stat.c Normal file
View File

@ -0,0 +1,139 @@
// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <memory.h>
#include "util/kvm-stat.h"
#include "util/parse-events.h"
#include "util/debug.h"
#include "util/evsel.h"
#include "util/evlist.h"
#include "util/pmus.h"
#define LOONGARCH_EXCEPTION_INT 0
#define LOONGARCH_EXCEPTION_PIL 1
#define LOONGARCH_EXCEPTION_PIS 2
#define LOONGARCH_EXCEPTION_PIF 3
#define LOONGARCH_EXCEPTION_PME 4
#define LOONGARCH_EXCEPTION_FPD 15
#define LOONGARCH_EXCEPTION_SXD 16
#define LOONGARCH_EXCEPTION_ASXD 17
#define LOONGARCH_EXCEPTION_GSPR 22
#define LOONGARCH_EXCEPTION_CPUCFG 100
#define LOONGARCH_EXCEPTION_CSR 101
#define LOONGARCH_EXCEPTION_IOCSR 102
#define LOONGARCH_EXCEPTION_IDLE 103
#define LOONGARCH_EXCEPTION_OTHERS 104
#define LOONGARCH_EXCEPTION_HVC 23
#define loongarch_exception_type \
{LOONGARCH_EXCEPTION_INT, "Interrupt" }, \
{LOONGARCH_EXCEPTION_PIL, "Mem Read" }, \
{LOONGARCH_EXCEPTION_PIS, "Mem Store" }, \
{LOONGARCH_EXCEPTION_PIF, "Inst Fetch" }, \
{LOONGARCH_EXCEPTION_PME, "Mem Modify" }, \
{LOONGARCH_EXCEPTION_FPD, "FPU" }, \
{LOONGARCH_EXCEPTION_SXD, "LSX" }, \
{LOONGARCH_EXCEPTION_ASXD, "LASX" }, \
{LOONGARCH_EXCEPTION_GSPR, "Privilege Error" }, \
{LOONGARCH_EXCEPTION_HVC, "Hypercall" }, \
{LOONGARCH_EXCEPTION_CPUCFG, "CPUCFG" }, \
{LOONGARCH_EXCEPTION_CSR, "CSR" }, \
{LOONGARCH_EXCEPTION_IOCSR, "IOCSR" }, \
{LOONGARCH_EXCEPTION_IDLE, "Idle" }, \
{LOONGARCH_EXCEPTION_OTHERS, "Others" }
define_exit_reasons_table(loongarch_exit_reasons, loongarch_exception_type);
const char *vcpu_id_str = "vcpu_id";
const char *kvm_exit_reason = "reason";
const char *kvm_entry_trace = "kvm:kvm_enter";
const char *kvm_reenter_trace = "kvm:kvm_reenter";
const char *kvm_exit_trace = "kvm:kvm_exit";
const char *kvm_events_tp[] = {
"kvm:kvm_enter",
"kvm:kvm_reenter",
"kvm:kvm_exit",
"kvm:kvm_exit_gspr",
NULL,
};
static bool event_begin(struct evsel *evsel,
struct perf_sample *sample, struct event_key *key)
{
return exit_event_begin(evsel, sample, key);
}
static bool event_end(struct evsel *evsel,
struct perf_sample *sample __maybe_unused,
struct event_key *key __maybe_unused)
{
/*
* LoongArch kvm is different with other architectures
*
* There is kvm:kvm_reenter or kvm:kvm_enter event adjacent with
* kvm:kvm_exit event.
* kvm:kvm_enter means returning to vmm and then to guest
* kvm:kvm_reenter means returning to guest immediately
*/
return evsel__name_is(evsel, kvm_entry_trace) || evsel__name_is(evsel, kvm_reenter_trace);
}
static void event_gspr_get_key(struct evsel *evsel,
struct perf_sample *sample, struct event_key *key)
{
unsigned int insn;
key->key = LOONGARCH_EXCEPTION_OTHERS;
insn = evsel__intval(evsel, sample, "inst_word");
switch (insn >> 24) {
case 0:
/* CPUCFG inst trap */
if ((insn >> 10) == 0x1b)
key->key = LOONGARCH_EXCEPTION_CPUCFG;
break;
case 4:
/* CSR inst trap */
key->key = LOONGARCH_EXCEPTION_CSR;
break;
case 6:
/* IOCSR inst trap */
if ((insn >> 15) == 0xc90)
key->key = LOONGARCH_EXCEPTION_IOCSR;
else if ((insn >> 15) == 0xc91)
/* Idle inst trap */
key->key = LOONGARCH_EXCEPTION_IDLE;
break;
default:
key->key = LOONGARCH_EXCEPTION_OTHERS;
break;
}
}
static struct child_event_ops child_events[] = {
{ .name = "kvm:kvm_exit_gspr", .get_key = event_gspr_get_key },
{ NULL, NULL },
};
static struct kvm_events_ops exit_events = {
.is_begin_event = event_begin,
.is_end_event = event_end,
.child_ops = child_events,
.decode_key = exit_event_decode_key,
.name = "VM-EXIT"
};
struct kvm_reg_events_ops kvm_reg_events_ops[] = {
{ .name = "vmexit", .ops = &exit_events, },
{ NULL, 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 = "loongarch64";
kvm->exit_reasons = loongarch_exit_reasons;
return 0;
}