Messages in this thread Patch in this message | | | From | Bibo Mao <> | Subject | [PATCH v3] perf kvm: Add kvm-stat for loongarch64 | Date | Thu, 11 Apr 2024 20:10:47 +0800 |
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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@loongson.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@yadro.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 -- 2.39.3
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