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- // SPDX-License-Identifier: GPL-2.0
- #include <errno.h>
- #include <unistd.h>
- #include <sys/syscall.h>
- #include <perf/evsel.h>
- #include <perf/cpumap.h>
- #include <perf/threadmap.h>
- #include <linux/list.h>
- #include <internal/evsel.h>
- #include <linux/zalloc.h>
- #include <stdlib.h>
- #include <internal/xyarray.h>
- #include <internal/cpumap.h>
- #include <internal/threadmap.h>
- #include <internal/lib.h>
- #include <linux/string.h>
- #include <sys/ioctl.h>
- void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr)
- {
- INIT_LIST_HEAD(&evsel->node);
- evsel->attr = *attr;
- }
- struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr)
- {
- struct perf_evsel *evsel = zalloc(sizeof(*evsel));
- if (evsel != NULL)
- perf_evsel__init(evsel, attr);
- return evsel;
- }
- void perf_evsel__delete(struct perf_evsel *evsel)
- {
- free(evsel);
- }
- #define FD(e, x, y) (*(int *) xyarray__entry(e->fd, x, y))
- int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
- {
- evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
- if (evsel->fd) {
- int cpu, thread;
- for (cpu = 0; cpu < ncpus; cpu++) {
- for (thread = 0; thread < nthreads; thread++) {
- FD(evsel, cpu, thread) = -1;
- }
- }
- }
- return evsel->fd != NULL ? 0 : -ENOMEM;
- }
- static int
- sys_perf_event_open(struct perf_event_attr *attr,
- pid_t pid, int cpu, int group_fd,
- unsigned long flags)
- {
- return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags);
- }
- int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
- struct perf_thread_map *threads)
- {
- int cpu, thread, err = 0;
- if (cpus == NULL) {
- static struct perf_cpu_map *empty_cpu_map;
- if (empty_cpu_map == NULL) {
- empty_cpu_map = perf_cpu_map__dummy_new();
- if (empty_cpu_map == NULL)
- return -ENOMEM;
- }
- cpus = empty_cpu_map;
- }
- if (threads == NULL) {
- static struct perf_thread_map *empty_thread_map;
- if (empty_thread_map == NULL) {
- empty_thread_map = perf_thread_map__new_dummy();
- if (empty_thread_map == NULL)
- return -ENOMEM;
- }
- threads = empty_thread_map;
- }
- if (evsel->fd == NULL &&
- perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
- return -ENOMEM;
- for (cpu = 0; cpu < cpus->nr; cpu++) {
- for (thread = 0; thread < threads->nr; thread++) {
- int fd;
- fd = sys_perf_event_open(&evsel->attr,
- threads->map[thread].pid,
- cpus->map[cpu], -1, 0);
- if (fd < 0)
- return -errno;
- FD(evsel, cpu, thread) = fd;
- }
- }
- return err;
- }
- void perf_evsel__close_fd(struct perf_evsel *evsel)
- {
- int cpu, thread;
- for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
- for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
- close(FD(evsel, cpu, thread));
- FD(evsel, cpu, thread) = -1;
- }
- }
- void perf_evsel__free_fd(struct perf_evsel *evsel)
- {
- xyarray__delete(evsel->fd);
- evsel->fd = NULL;
- }
- void perf_evsel__close(struct perf_evsel *evsel)
- {
- if (evsel->fd == NULL)
- return;
- perf_evsel__close_fd(evsel);
- perf_evsel__free_fd(evsel);
- }
- int perf_evsel__read_size(struct perf_evsel *evsel)
- {
- u64 read_format = evsel->attr.read_format;
- int entry = sizeof(u64); /* value */
- int size = 0;
- int nr = 1;
- if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
- size += sizeof(u64);
- if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
- size += sizeof(u64);
- if (read_format & PERF_FORMAT_ID)
- entry += sizeof(u64);
- if (read_format & PERF_FORMAT_GROUP) {
- nr = evsel->nr_members;
- size += sizeof(u64);
- }
- size += entry * nr;
- return size;
- }
- int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
- struct perf_counts_values *count)
- {
- size_t size = perf_evsel__read_size(evsel);
- memset(count, 0, sizeof(*count));
- if (FD(evsel, cpu, thread) < 0)
- return -EINVAL;
- if (readn(FD(evsel, cpu, thread), count->values, size) <= 0)
- return -errno;
- return 0;
- }
- static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
- int ioc, void *arg)
- {
- int cpu, thread;
- for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
- for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
- int fd = FD(evsel, cpu, thread),
- err = ioctl(fd, ioc, arg);
- if (err)
- return err;
- }
- }
- return 0;
- }
- int perf_evsel__enable(struct perf_evsel *evsel)
- {
- return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, 0);
- }
- int perf_evsel__disable(struct perf_evsel *evsel)
- {
- return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, 0);
- }
- int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
- {
- return perf_evsel__run_ioctl(evsel,
- PERF_EVENT_IOC_SET_FILTER,
- (void *)filter);
- }
- struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel)
- {
- return evsel->cpus;
- }
- struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel)
- {
- return evsel->threads;
- }
- struct perf_event_attr *perf_evsel__attr(struct perf_evsel *evsel)
- {
- return &evsel->attr;
- }
- int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
- {
- if (ncpus == 0 || nthreads == 0)
- return 0;
- if (evsel->system_wide)
- nthreads = 1;
- evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
- if (evsel->sample_id == NULL)
- return -ENOMEM;
- evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
- if (evsel->id == NULL) {
- xyarray__delete(evsel->sample_id);
- evsel->sample_id = NULL;
- return -ENOMEM;
- }
- return 0;
- }
- void perf_evsel__free_id(struct perf_evsel *evsel)
- {
- xyarray__delete(evsel->sample_id);
- evsel->sample_id = NULL;
- zfree(&evsel->id);
- evsel->ids = 0;
- }
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