diff options
Diffstat (limited to 'tools/perf/util/tool_pmu.c')
| -rw-r--r-- | tools/perf/util/tool_pmu.c | 505 |
1 files changed, 505 insertions, 0 deletions
diff --git a/tools/perf/util/tool_pmu.c b/tools/perf/util/tool_pmu.c new file mode 100644 index 000000000000..4fb097578479 --- /dev/null +++ b/tools/perf/util/tool_pmu.c @@ -0,0 +1,505 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include "cgroup.h" +#include "counts.h" +#include "cputopo.h" +#include "evsel.h" +#include "pmu.h" +#include "print-events.h" +#include "smt.h" +#include "time-utils.h" +#include "tool_pmu.h" +#include "tsc.h" +#include <api/fs/fs.h> +#include <api/io.h> +#include <internal/threadmap.h> +#include <perf/threadmap.h> +#include <fcntl.h> +#include <strings.h> + +static const char *const tool_pmu__event_names[TOOL_PMU__EVENT_MAX] = { + NULL, + "duration_time", + "user_time", + "system_time", + "has_pmem", + "num_cores", + "num_cpus", + "num_cpus_online", + "num_dies", + "num_packages", + "slots", + "smt_on", + "system_tsc_freq", +}; + +bool tool_pmu__skip_event(const char *name __maybe_unused) +{ +#if !defined(__aarch64__) + /* The slots event should only appear on arm64. */ + if (strcasecmp(name, "slots") == 0) + return true; +#endif +#if !defined(__i386__) && !defined(__x86_64__) + /* The system_tsc_freq event should only appear on x86. */ + if (strcasecmp(name, "system_tsc_freq") == 0) + return true; +#endif + return false; +} + +int tool_pmu__num_skip_events(void) +{ + int num = 0; + +#if !defined(__aarch64__) + num++; +#endif +#if !defined(__i386__) && !defined(__x86_64__) + num++; +#endif + return num; +} + +const char *tool_pmu__event_to_str(enum tool_pmu_event ev) +{ + if (ev > TOOL_PMU__EVENT_NONE && ev < TOOL_PMU__EVENT_MAX) + return tool_pmu__event_names[ev]; + + return NULL; +} + +enum tool_pmu_event tool_pmu__str_to_event(const char *str) +{ + int i; + + if (tool_pmu__skip_event(str)) + return TOOL_PMU__EVENT_NONE; + + tool_pmu__for_each_event(i) { + if (!strcasecmp(str, tool_pmu__event_names[i])) + return i; + } + return TOOL_PMU__EVENT_NONE; +} + +bool perf_pmu__is_tool(const struct perf_pmu *pmu) +{ + return pmu && pmu->type == PERF_PMU_TYPE_TOOL; +} + +bool evsel__is_tool(const struct evsel *evsel) +{ + return perf_pmu__is_tool(evsel->pmu); +} + +enum tool_pmu_event evsel__tool_event(const struct evsel *evsel) +{ + if (!evsel__is_tool(evsel)) + return TOOL_PMU__EVENT_NONE; + + return (enum tool_pmu_event)evsel->core.attr.config; +} + +const char *evsel__tool_pmu_event_name(const struct evsel *evsel) +{ + return tool_pmu__event_to_str(evsel->core.attr.config); +} + +static bool read_until_char(struct io *io, char e) +{ + int c; + + do { + c = io__get_char(io); + if (c == -1) + return false; + } while (c != e); + return true; +} + +static int read_stat_field(int fd, struct perf_cpu cpu, int field, __u64 *val) +{ + char buf[256]; + struct io io; + int i; + + io__init(&io, fd, buf, sizeof(buf)); + + /* Skip lines to relevant CPU. */ + for (i = -1; i < cpu.cpu; i++) { + if (!read_until_char(&io, '\n')) + return -EINVAL; + } + /* Skip to "cpu". */ + if (io__get_char(&io) != 'c') return -EINVAL; + if (io__get_char(&io) != 'p') return -EINVAL; + if (io__get_char(&io) != 'u') return -EINVAL; + + /* Skip N of cpuN. */ + if (!read_until_char(&io, ' ')) + return -EINVAL; + + i = 1; + while (true) { + if (io__get_dec(&io, val) != ' ') + break; + if (field == i) + return 0; + i++; + } + return -EINVAL; +} + +static int read_pid_stat_field(int fd, int field, __u64 *val) +{ + char buf[256]; + struct io io; + int c, i; + + io__init(&io, fd, buf, sizeof(buf)); + if (io__get_dec(&io, val) != ' ') + return -EINVAL; + if (field == 1) + return 0; + + /* Skip comm. */ + if (io__get_char(&io) != '(' || !read_until_char(&io, ')')) + return -EINVAL; + if (field == 2) + return -EINVAL; /* String can't be returned. */ + + /* Skip state */ + if (io__get_char(&io) != ' ' || io__get_char(&io) == -1) + return -EINVAL; + if (field == 3) + return -EINVAL; /* String can't be returned. */ + + /* Loop over numeric fields*/ + if (io__get_char(&io) != ' ') + return -EINVAL; + + i = 4; + while (true) { + c = io__get_dec(&io, val); + if (c == -1) + return -EINVAL; + if (c == -2) { + /* Assume a -ve was read */ + c = io__get_dec(&io, val); + *val *= -1; + } + if (c != ' ') + return -EINVAL; + if (field == i) + return 0; + i++; + } + return -EINVAL; +} + +int evsel__tool_pmu_prepare_open(struct evsel *evsel, + struct perf_cpu_map *cpus, + int nthreads) +{ + if ((evsel__tool_event(evsel) == TOOL_PMU__EVENT_SYSTEM_TIME || + evsel__tool_event(evsel) == TOOL_PMU__EVENT_USER_TIME) && + !evsel->start_times) { + evsel->start_times = xyarray__new(perf_cpu_map__nr(cpus), + nthreads, + sizeof(__u64)); + if (!evsel->start_times) + return -ENOMEM; + } + return 0; +} + +#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y)) + +int evsel__tool_pmu_open(struct evsel *evsel, + struct perf_thread_map *threads, + int start_cpu_map_idx, int end_cpu_map_idx) +{ + enum tool_pmu_event ev = evsel__tool_event(evsel); + int pid = -1, idx = 0, thread = 0, nthreads, err = 0, old_errno; + + if (ev == TOOL_PMU__EVENT_NUM_CPUS) + return 0; + + if (ev == TOOL_PMU__EVENT_DURATION_TIME) { + if (evsel->core.attr.sample_period) /* no sampling */ + return -EINVAL; + evsel->start_time = rdclock(); + return 0; + } + + if (evsel->cgrp) + pid = evsel->cgrp->fd; + + nthreads = perf_thread_map__nr(threads); + for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) { + for (thread = 0; thread < nthreads; thread++) { + if (thread >= nthreads) + break; + + if (!evsel->cgrp && !evsel->core.system_wide) + pid = perf_thread_map__pid(threads, thread); + + if (ev == TOOL_PMU__EVENT_USER_TIME || ev == TOOL_PMU__EVENT_SYSTEM_TIME) { + bool system = ev == TOOL_PMU__EVENT_SYSTEM_TIME; + __u64 *start_time = NULL; + int fd; + + if (evsel->core.attr.sample_period) { + /* no sampling */ + err = -EINVAL; + goto out_close; + } + if (pid > -1) { + char buf[64]; + + snprintf(buf, sizeof(buf), "/proc/%d/stat", pid); + fd = open(buf, O_RDONLY); + evsel->pid_stat = true; + } else { + fd = open("/proc/stat", O_RDONLY); + } + FD(evsel, idx, thread) = fd; + if (fd < 0) { + err = -errno; + goto out_close; + } + start_time = xyarray__entry(evsel->start_times, idx, thread); + if (pid > -1) { + err = read_pid_stat_field(fd, system ? 15 : 14, + start_time); + } else { + struct perf_cpu cpu; + + cpu = perf_cpu_map__cpu(evsel->core.cpus, idx); + err = read_stat_field(fd, cpu, system ? 3 : 1, + start_time); + } + if (err) + goto out_close; + } + + } + } + return 0; +out_close: + if (err) + threads->err_thread = thread; + + old_errno = errno; + do { + while (--thread >= 0) { + if (FD(evsel, idx, thread) >= 0) + close(FD(evsel, idx, thread)); + FD(evsel, idx, thread) = -1; + } + thread = nthreads; + } while (--idx >= 0); + errno = old_errno; + return err; +} + +#if !defined(__i386__) && !defined(__x86_64__) +u64 arch_get_tsc_freq(void) +{ + return 0; +} +#endif + +#if !defined(__aarch64__) +u64 tool_pmu__cpu_slots_per_cycle(void) +{ + return 0; +} +#endif + +static bool has_pmem(void) +{ + static bool has_pmem, cached; + const char *sysfs = sysfs__mountpoint(); + char path[PATH_MAX]; + + if (!cached) { + snprintf(path, sizeof(path), "%s/firmware/acpi/tables/NFIT", sysfs); + has_pmem = access(path, F_OK) == 0; + cached = true; + } + return has_pmem; +} + +bool tool_pmu__read_event(enum tool_pmu_event ev, u64 *result) +{ + const struct cpu_topology *topology; + + switch (ev) { + case TOOL_PMU__EVENT_HAS_PMEM: + *result = has_pmem() ? 1 : 0; + return true; + + case TOOL_PMU__EVENT_NUM_CORES: + topology = online_topology(); + *result = topology->core_cpus_lists; + return true; + + case TOOL_PMU__EVENT_NUM_CPUS: + *result = cpu__max_present_cpu().cpu; + return true; + + case TOOL_PMU__EVENT_NUM_CPUS_ONLINE: { + struct perf_cpu_map *online = cpu_map__online(); + + if (online) { + *result = perf_cpu_map__nr(online); + return true; + } + return false; + } + case TOOL_PMU__EVENT_NUM_DIES: + topology = online_topology(); + *result = topology->die_cpus_lists; + return true; + + case TOOL_PMU__EVENT_NUM_PACKAGES: + topology = online_topology(); + *result = topology->package_cpus_lists; + return true; + + case TOOL_PMU__EVENT_SLOTS: + *result = tool_pmu__cpu_slots_per_cycle(); + return *result ? true : false; + + case TOOL_PMU__EVENT_SMT_ON: + *result = smt_on() ? 1 : 0; + return true; + + case TOOL_PMU__EVENT_SYSTEM_TSC_FREQ: + *result = arch_get_tsc_freq(); + return true; + + case TOOL_PMU__EVENT_NONE: + case TOOL_PMU__EVENT_DURATION_TIME: + case TOOL_PMU__EVENT_USER_TIME: + case TOOL_PMU__EVENT_SYSTEM_TIME: + case TOOL_PMU__EVENT_MAX: + default: + return false; + } +} + +int evsel__tool_pmu_read(struct evsel *evsel, int cpu_map_idx, int thread) +{ + __u64 *start_time, cur_time, delta_start; + u64 val; + int fd, err = 0; + struct perf_counts_values *count, *old_count = NULL; + bool adjust = false; + enum tool_pmu_event ev = evsel__tool_event(evsel); + + count = perf_counts(evsel->counts, cpu_map_idx, thread); + + switch (ev) { + case TOOL_PMU__EVENT_HAS_PMEM: + case TOOL_PMU__EVENT_NUM_CORES: + case TOOL_PMU__EVENT_NUM_CPUS: + case TOOL_PMU__EVENT_NUM_CPUS_ONLINE: + case TOOL_PMU__EVENT_NUM_DIES: + case TOOL_PMU__EVENT_NUM_PACKAGES: + case TOOL_PMU__EVENT_SLOTS: + case TOOL_PMU__EVENT_SMT_ON: + case TOOL_PMU__EVENT_SYSTEM_TSC_FREQ: + if (evsel->prev_raw_counts) + old_count = perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread); + val = 0; + if (cpu_map_idx == 0 && thread == 0) { + if (!tool_pmu__read_event(ev, &val)) { + count->lost++; + val = 0; + } + } + if (old_count) { + count->val = old_count->val + val; + count->run = old_count->run + 1; + count->ena = old_count->ena + 1; + } else { + count->val = val; + count->run++; + count->ena++; + } + return 0; + case TOOL_PMU__EVENT_DURATION_TIME: + /* + * Pretend duration_time is only on the first CPU and thread, or + * else aggregation will scale duration_time by the number of + * CPUs/threads. + */ + start_time = &evsel->start_time; + if (cpu_map_idx == 0 && thread == 0) + cur_time = rdclock(); + else + cur_time = *start_time; + break; + case TOOL_PMU__EVENT_USER_TIME: + case TOOL_PMU__EVENT_SYSTEM_TIME: { + bool system = evsel__tool_event(evsel) == TOOL_PMU__EVENT_SYSTEM_TIME; + + start_time = xyarray__entry(evsel->start_times, cpu_map_idx, thread); + fd = FD(evsel, cpu_map_idx, thread); + lseek(fd, SEEK_SET, 0); + if (evsel->pid_stat) { + /* The event exists solely on 1 CPU. */ + if (cpu_map_idx == 0) + err = read_pid_stat_field(fd, system ? 15 : 14, &cur_time); + else + cur_time = 0; + } else { + /* The event is for all threads. */ + if (thread == 0) { + struct perf_cpu cpu = perf_cpu_map__cpu(evsel->core.cpus, + cpu_map_idx); + + err = read_stat_field(fd, cpu, system ? 3 : 1, &cur_time); + } else { + cur_time = 0; + } + } + adjust = true; + break; + } + case TOOL_PMU__EVENT_NONE: + case TOOL_PMU__EVENT_MAX: + default: + err = -EINVAL; + } + if (err) + return err; + + delta_start = cur_time - *start_time; + if (adjust) { + __u64 ticks_per_sec = sysconf(_SC_CLK_TCK); + + delta_start *= 1000000000 / ticks_per_sec; + } + count->val = delta_start; + count->ena = count->run = delta_start; + count->lost = 0; + return 0; +} + +struct perf_pmu *perf_pmus__tool_pmu(void) +{ + static struct perf_pmu tool = { + .name = "tool", + .type = PERF_PMU_TYPE_TOOL, + .aliases = LIST_HEAD_INIT(tool.aliases), + .caps = LIST_HEAD_INIT(tool.caps), + .format = LIST_HEAD_INIT(tool.format), + }; + if (!tool.events_table) + tool.events_table = find_core_events_table("common", "common"); + + return &tool; +} |