From nobody Mon Feb 9 16:34:14 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5331A3FB14; Tue, 2 Apr 2024 08:44:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712047456; cv=none; b=EKlmClSB9g58b6FqVqvlZgxZvWm+ToLownvJvZECQuWaBkjffmiC5W/bkrXOHRg4DTOvUApHXZqYBHkJMqxkv2yuaETF/zW4zJHo4x+A4Rl8hpa+6BTBgm71Y7C+5WKZ0Uyn5gIGUKPAzEeb2sMTDc1spjQK5prbYd7h9ATx3nM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712047456; c=relaxed/simple; bh=2QS9C22Nsp15QOTHapTYNst3qyOy0U2BUE2u6hPUunw=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=oQ5y8P7ZY9UQARBnG1B8kwN/sd2GUYA88FM1kT0lfHmMeSu7+fkjwDFIJJdQE2u0CboI+eoNqsA5tAXOD47TFhjGfcTRv1TYJgteBliD9zOii0DFrObT4Xobpd99DZUTt22Y3vkitgVkdvNarGorW0kY+bkUXUPDSAAK8vOZ1tc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8DxvutRxQtmXEIiAA--.13043S3; Tue, 02 Apr 2024 16:44:01 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxLBNOxQtmGa9xAA--.23906S2; Tue, 02 Apr 2024 16:43:58 +0800 (CST) From: Bibo Mao To: Peter Zijlstra , Ingo Molnar Cc: Ming Wang , Huacai Chen , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: [PATCH] perf kvm: Add kvm-stat for loongarch64 Date: Tue, 2 Apr 2024 16:43:58 +0800 Message-Id: <20240402084358.205003-1-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8CxLBNOxQtmGa9xAA--.23906S2 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" 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) Memory store 73427 50.00% 630743820 10.00% 8590 Memory read 36110 24.00% 109129170 1.00% 3022 Privilege Error 18921 12.00% 5231868450 87.00% 276511 Interrupt 10214 6.00% 13674060 0.00% 1338 Hypercall 5043 3.00% 14121450 0.00% 2800 FP Disabled 1850 1.00% 2798020 0.00% 1512 Ifecth 813 0.00% 2035340 0.00% 2503 Memory modify 362 0.00% 633070 0.00% 1748 LASX Disabled 3 0.00% 5440 0.00% 1813 LSX Disabled 2 0.00% 2670 0.00% 1335 Signed-off-by: Bibo Mao --- 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 | 98 +++++++++++++++++++++++ 4 files changed, 186 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 c392e7af4743..c8be64c5cdb4 100644 --- a/tools/perf/arch/loongarch/Makefile +++ b/tools/perf/arch/loongarch/Makefile @@ -4,6 +4,7 @@ PERF_HAVE_DWARF_REGS :=3D 1 endif PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET :=3D 1 PERF_HAVE_JITDUMP :=3D 1 +HAVE_KVM_STAT_SUPPORT :=3D 1 =20 # # Syscall table generation for perf diff --git a/tools/perf/arch/loongarch/util/Build b/tools/perf/arch/loongar= ch/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 +=3D perf_regs.o +perf-y +=3D header.o =20 +perf-$(CONFIG_LIBTRACEEVENT) +=3D kvm-stat.o perf-$(CONFIG_DWARF) +=3D dwarf-regs.o perf-$(CONFIG_LOCAL_LIBUNWIND) +=3D unwind-libunwind.o perf-$(CONFIG_LIBDW_DWARF_UNWIND) +=3D unwind-libdw.o diff --git a/tools/perf/arch/loongarch/util/header.c b/tools/perf/arch/loon= garch/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 + */ + +#include +#include +#include +#include +#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 =3D strrchr(line, ' '); + if (!line2) + return NULL; + + line2++; + nl =3D strrchr(line, '\n'); + if (!nl) + return NULL; + + return strndup(line2, nl - line2); +} + +static char *_get_cpuid(void) +{ + char *line =3D NULL; + char *model =3D NULL; + char *cpuid =3D NULL; + int read; + unsigned long line_sz; + FILE *cpuinfo; + + cpuinfo =3D fopen(CPUINFO, "r"); + if (cpuinfo =3D=3D NULL) + return cpuid; + + while ((read =3D getline(&line, &line_sz, cpuinfo)) !=3D -1) { + if (strncmp(line, CPUINFO_MODEL, strlen(CPUINFO_MODEL))) + continue; + + model =3D _get_field(line); + if (!model) + goto free; + break; + } + + if (asprintf(&cpuid, "%s", model) < 0) + cpuid =3D NULL; + +free: + fclose(cpuinfo); + free(model); + return cpuid; +} + +int get_cpuid(char *buffer, size_t sz) +{ + char *cpuid =3D _get_cpuid(); + int ret =3D 0; + + if (sz < strlen(cpuid)) { + ret =3D -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/lo= ongarch/util/kvm-stat.c new file mode 100644 index 000000000000..c69ab40e3ba6 --- /dev/null +++ b/tools/perf/arch/loongarch/util/kvm-stat.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#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_PNR 5 +#define LOONGARCH_EXCEPTION_PNX 6 +#define LOONGARCH_EXCEPTION_PPI 7 +#define LOONGARCH_EXCEPTION_FPD 15 +#define LOONGARCH_EXCEPTION_SXD 16 +#define LOONGARCH_EXCEPTION_ASXD 17 +#define LOONGARCH_EXCEPTION_GSPR 22 +#define LOONGARCH_EXCEPTION_HVC 23 +#define LOONGARCH_EXCEPTION_GCM 24 + +#define loongarch_exception_type \ + {LOONGARCH_EXCEPTION_INT, "Interrupt" }, \ + {LOONGARCH_EXCEPTION_PIL, "Memory read" }, \ + {LOONGARCH_EXCEPTION_PIS, "Memory store" }, \ + {LOONGARCH_EXCEPTION_PIF, "Ifecth" }, \ + {LOONGARCH_EXCEPTION_PME, "Memory modify" }, \ + {LOONGARCH_EXCEPTION_PNR, "Memory NR" }, \ + {LOONGARCH_EXCEPTION_PNX, "Memory NX" }, \ + {LOONGARCH_EXCEPTION_PPI, "Memory Privilege" }, \ + {LOONGARCH_EXCEPTION_FPD, "FP Disabled" }, \ + {LOONGARCH_EXCEPTION_SXD, "LSX Disabled" }, \ + {LOONGARCH_EXCEPTION_ASXD, "LASX Disabled" }, \ + {LOONGARCH_EXCEPTION_GSPR, "Privilege Error" }, \ + {LOONGARCH_EXCEPTION_HVC, "Hypercall" }, \ + {LOONGARCH_EXCEPTION_GCM, "CSR modified" } + +define_exit_reasons_table(loongarch_exit_reasons, loongarch_exception_type= ); + +const char *vcpu_id_str =3D "vcpu_id"; +const char *kvm_exit_reason =3D "reason"; +const char *kvm_entry_trace =3D "kvm:kvm_enter"; +const char *kvm_reenter_trace =3D "kvm:kvm_reenter"; +const char *kvm_exit_trace =3D "kvm:kvm_exit"; + +const char *kvm_events_tp[] =3D { + "kvm:kvm_enter", + "kvm:kvm_reenter", + "kvm:kvm_exit", + 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 struct kvm_events_ops exit_events =3D { + .is_begin_event =3D exit_event_begin, + .is_end_event =3D event_end, + .decode_key =3D exit_event_decode_key, + .name =3D "VM-EXIT" +}; + +struct kvm_reg_events_ops kvm_reg_events_ops[] =3D { + { + .name =3D "vmexit", + .ops =3D &exit_events, + }, + { NULL, NULL }, +}; + +const char * const kvm_skip_events[] =3D { + NULL, +}; + +int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unus= ed) +{ + kvm->exit_reasons_isa =3D "loongarch64"; + kvm->exit_reasons =3D loongarch_exit_reasons; + return 0; +} --=20 2.33.0