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Date: Mon, 8 Apr 2024 10:01:13 +0800
From: maobibo <maobibo@...ngson.cn>
To: Ian Rogers <irogers@...gle.com>
Cc: Ming Wang <wangming01@...ngson.cn>, Huacai Chen <chenhuacai@...nel.org>,
Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2] perf kvm: Add kvm-stat for loongarch64
On 2024/4/8 上午3:08, Ian Rogers wrote:
> On Sun, Apr 7, 2024 at 1:37 AM Bibo Mao <maobibo@...ngson.cn> wrote:
>>
>> 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
>> Ifecth 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@...ngson.cn>
>> v1 --- v2:
>> 1. Add child_ops for kvm exit event, split kvm:kvm_exit_gspr events
>> into cpucfg/csr/iocsr/idle child events by decoding detailed gspr
>> instruction.
>> 2. Remove some exception code type which does not happen in current
>> kvm implementation, such as meomry NR/NX/priviledge exception.
>> ---
>> tools/perf/arch/loongarch/Makefile | 1 +
>> tools/perf/arch/loongarch/util/Build | 2 +
>> tools/perf/arch/loongarch/util/header.c | 85 +++++++++++++
>> tools/perf/arch/loongarch/util/kvm-stat.c | 141 ++++++++++++++++++++++
>> 4 files changed, 229 insertions(+)
>> create mode 100644 tools/perf/arch/loongarch/util/header.c
>> create mode 100644 tools/perf/arch/loongarch/util/kvm-stat.c
>>
>> diff --git a/tools/perf/arch/loongarch/Makefile b/tools/perf/arch/loongarch/Makefile
>> index 3992a67a87d9..c89d6bb6b184 100644
>> --- a/tools/perf/arch/loongarch/Makefile
>> +++ b/tools/perf/arch/loongarch/Makefile
>> @@ -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
>> diff --git a/tools/perf/arch/loongarch/util/Build b/tools/perf/arch/loongarch/util/Build
>> index d776125a2d06..e1a13761037b 100644
>> --- a/tools/perf/arch/loongarch/util/Build
>> +++ b/tools/perf/arch/loongarch/util/Build
>> @@ -1,5 +1,7 @@
>> perf-y += perf_regs.o
>> +perf-y += header.o
>>
>> +perf-$(CONFIG_LIBTRACEEVENT) += kvm-stat.o
>> perf-$(CONFIG_DWARF) += dwarf-regs.o
>> perf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
>> perf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
>> diff --git a/tools/perf/arch/loongarch/util/header.c b/tools/perf/arch/loongarch/util/header.c
>> new file mode 100644
>> index 000000000000..8f7061cf6977
>> --- /dev/null
>> +++ b/tools/perf/arch/loongarch/util/header.c
>> @@ -0,0 +1,85 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Implementation of get_cpuid().
>> + *
>> + * Author: Nikita Shubin <n.shubin@...ro.com>
>> + */
>> +
>> +#include <stdio.h>
>> +#include <stdlib.h>
>> +#include <api/fs/fs.h>
>> +#include <errno.h>
>> +#include "util/debug.h"
>> +#include "util/header.h"
>> +
>> +#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)
>> +{
>> + char *line = NULL;
>> + char *model = NULL;
>> + char *cpuid = NULL;
>> + int read;
>> + unsigned long line_sz;
>> + FILE *cpuinfo;
>> +
>> + cpuinfo = fopen(CPUINFO, "r");
>> + if (cpuinfo == NULL)
>> + return cpuid;
>> +
>> + while ((read = getline(&line, &line_sz, cpuinfo)) != -1) {
>> + if (strncmp(line, CPUINFO_MODEL, strlen(CPUINFO_MODEL)))
>> + continue;
>> +
>> + model = _get_field(line);
>> + if (!model)
>> + goto free;
>> + break;
>> + }
>> +
>> + if (asprintf(&cpuid, "%s", model) < 0)
>> + cpuid = NULL;
>> +
>> +free:
>> + fclose(cpuinfo);
>> + free(model);
>> + return cpuid;
>> +}
>> +
>> +int get_cpuid(char *buffer, size_t sz)
>> +{
>> + char *cpuid = _get_cpuid();
>> + int ret = 0;
>> +
>> + if (sz < strlen(cpuid)) {
>
> Could this not segfault if cpuid is NULL?
yes, it is a problem. Will add NULL checking in next version.
Regards
Bibo Mao
>
> Thanks,
> Ian
>
>> + ret = -EINVAL;
>> + goto free;
>> + }
>> +
>> + scnprintf(buffer, sz, "%s", cpuid);
>> +free:
>> + free(cpuid);
>> + return ret;
>> +}
>> +
>> +char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
>> +{
>> + return _get_cpuid();
>> +}
>> diff --git a/tools/perf/arch/loongarch/util/kvm-stat.c b/tools/perf/arch/loongarch/util/kvm-stat.c
>> new file mode 100644
>> index 000000000000..2c21d73cd855
>> --- /dev/null
>> +++ b/tools/perf/arch/loongarch/util/kvm-stat.c
>> @@ -0,0 +1,141 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +#include <errno.h>
>> +#include <memory.h>
>> +#include <errno.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, "Ifecth" }, \
>> + {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_end(struct evsel *evsel,
>> + struct perf_sample *sample __maybe_unused,
>> + struct event_key *key __maybe_unused)
>> +{
>> + /*
>> + * LoongArch kvm is a little different with other architectures
>> + *
>> + * There is kvm:kvm_reenter and kvm:kvm_enter event adjacent with
>> + * kvm:kvm_exit event.
>> + * kvm:kvm_reenter means returning to guest immediately
>> + * kvm:kvm_enter means returning to vmm and then to guest
>> + */
>> + 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 = exit_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;
>> +}
>>
>> base-commit: f2f80ac809875855ac843f9e5e7480604b5cbff5
>> --
>> 2.39.3
>>
>>
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