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Message-ID: <83ae11b8-69af-eaf8-8768-dc6d55cdcd90@loongson.cn>
Date: Fri, 10 May 2024 09:47:34 +0800
From: maobibo <maobibo@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>, Ian Rogers <irogers@...gle.com>,
Ming Wang <wangming01@...ngson.cn>, Ingo Molnar <mingo@...hat.com>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v3] perf kvm: Add kvm-stat for loongarch64
On 2024/5/8 下午9:02, Huacai Chen wrote:
> On Tue, May 7, 2024 at 2:11 PM maobibo <maobibo@...ngson.cn> wrote:
>>
>> Hi Peter/Ian/Huacai,
>>
>> This patch stays one month without response, I know you are busy and
>> look through thousands of patch every day.
>>
>> Just one question, who has permission to merge perf kvm patch for
>> LoongArch. Is it LoongArch maintainer or perf kvm maintainer?
> It should probably go to perf tree, but if it is allowed, maybe I can
> try to merge into LoongArch tree.
tools/perf/arch/loongarch/Makefile | 1 +
tools/perf/arch/loongarch/util/Build | 2 +
tools/perf/arch/loongarch/util/header.c | 88 ++++++++++++++
tools/perf/arch/loongarch/util/kvm-stat.c | 135 ++++++++++++++++++++++
All the modification is LoongArch specific, there will be much
appreciated if it can reviewed and merged.
Regards
Bibo Mao
>
>
> Huacai
>>
>> Regards
>> Bibo Mao
>>
>>
>> On 2024/4/11 下午8:10, Bibo Mao 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>
>>> ---
>>> v2 --- v3:
>>> 1. Add NULL check with cpuid in function get_cpuid()
>>> 2. Add example output from /proc/cpuinfo before function get_cpuid()
>>> 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 | 88 ++++++++++++++
>>> tools/perf/arch/loongarch/util/kvm-stat.c | 135 ++++++++++++++++++++++
>>> 4 files changed, 226 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..b12d374d7096 100644
>>> --- a/tools/perf/arch/loongarch/util/Build
>>> +++ b/tools/perf/arch/loongarch/util/Build
>>> @@ -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
>>> diff --git a/tools/perf/arch/loongarch/util/header.c b/tools/perf/arch/loongarch/util/header.c
>>> new file mode 100644
>>> index 000000000000..a4ed732b49c6
>>> --- /dev/null
>>> +++ b/tools/perf/arch/loongarch/util/header.c
>>> @@ -0,0 +1,88 @@
>>> +// 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"
>>> +
>>> +/*
>>> + * Output example from /proc/cpuinfo
>>> + * CPU Family : Loongson-64bit
>>> + * Model Name : Loongson-3C5000
>>> + * CPU Revision : 0x11
>>> + */
>>> +#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, *model, *cpuid;
>>> + unsigned long line_sz;
>>> + FILE *file;
>>> +
>>> + file = fopen(CPUINFO, "r");
>>> + if (file == NULL)
>>> + return cpuid;
>>> +
>>> + 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 free;
>>> + break;
>>> + }
>>> +
>>> + if (model && (asprintf(&cpuid, "%s", model) < 0))
>>> + cpuid = NULL;
>>> +
>>> +free:
>>> + fclose(file);
>>> + free(model);
>>> + return cpuid;
>>> +}
>>> +
>>> +int get_cpuid(char *buffer, size_t sz)
>>> +{
>>> + char *cpuid = __get_cpuid();
>>> + int ret = 0;
>>> +
>>> + if (!cpuid)
>>> + return EINVAL;
>>> +
>>> + if (sz >= strlen(cpuid))
>>> + scnprintf(buffer, sz, "%s", cpuid);
>>> + else
>>> + ret = ENOBUFS;
>>> + 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..cc50adb0835a
>>> --- /dev/null
>>> +++ b/tools/perf/arch/loongarch/util/kvm-stat.c
>>> @@ -0,0 +1,135 @@
>>> +// 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 different with other architectures
>>> + *
>>> + * There is kvm:kvm_reenter or 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: 2c71fdf02a95b3dd425b42f28fd47fb2b1d22702
>>>
>>
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