434 lines
8.9 KiB
C
434 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <perf/evsel.h>
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#include <perf/cpumap.h>
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#include <perf/threadmap.h>
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#include <linux/list.h>
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#include <internal/evsel.h>
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#include <linux/zalloc.h>
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#include <stdlib.h>
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#include <internal/xyarray.h>
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#include <internal/cpumap.h>
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#include <internal/mmap.h>
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#include <internal/threadmap.h>
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#include <internal/lib.h>
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#include <linux/string.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <asm/bug.h>
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void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr,
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int idx)
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{
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INIT_LIST_HEAD(&evsel->node);
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evsel->attr = *attr;
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evsel->idx = idx;
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evsel->leader = evsel;
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}
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struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr)
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{
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struct perf_evsel *evsel = zalloc(sizeof(*evsel));
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if (evsel != NULL)
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perf_evsel__init(evsel, attr, 0);
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return evsel;
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}
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void perf_evsel__delete(struct perf_evsel *evsel)
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{
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free(evsel);
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}
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#define FD(e, x, y) ((int *) xyarray__entry(e->fd, x, y))
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#define MMAP(e, x, y) (e->mmap ? ((struct perf_mmap *) xyarray__entry(e->mmap, x, y)) : NULL)
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int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
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{
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evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
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if (evsel->fd) {
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int cpu, thread;
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for (cpu = 0; cpu < ncpus; cpu++) {
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for (thread = 0; thread < nthreads; thread++) {
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int *fd = FD(evsel, cpu, thread);
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if (fd)
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*fd = -1;
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}
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}
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}
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return evsel->fd != NULL ? 0 : -ENOMEM;
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}
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static int perf_evsel__alloc_mmap(struct perf_evsel *evsel, int ncpus, int nthreads)
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{
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evsel->mmap = xyarray__new(ncpus, nthreads, sizeof(struct perf_mmap));
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return evsel->mmap != NULL ? 0 : -ENOMEM;
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}
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static int
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sys_perf_event_open(struct perf_event_attr *attr,
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pid_t pid, int cpu, int group_fd,
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unsigned long flags)
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{
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return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags);
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}
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static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread, int *group_fd)
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{
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struct perf_evsel *leader = evsel->leader;
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int *fd;
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if (evsel == leader) {
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*group_fd = -1;
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return 0;
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}
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/*
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* Leader must be already processed/open,
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* if not it's a bug.
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*/
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if (!leader->fd)
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return -ENOTCONN;
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fd = FD(leader, cpu, thread);
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if (fd == NULL || *fd == -1)
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return -EBADF;
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*group_fd = *fd;
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return 0;
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}
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int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
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struct perf_thread_map *threads)
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{
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int cpu, thread, err = 0;
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if (cpus == NULL) {
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static struct perf_cpu_map *empty_cpu_map;
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if (empty_cpu_map == NULL) {
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empty_cpu_map = perf_cpu_map__dummy_new();
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if (empty_cpu_map == NULL)
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return -ENOMEM;
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}
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cpus = empty_cpu_map;
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}
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if (threads == NULL) {
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static struct perf_thread_map *empty_thread_map;
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if (empty_thread_map == NULL) {
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empty_thread_map = perf_thread_map__new_dummy();
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if (empty_thread_map == NULL)
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return -ENOMEM;
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}
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threads = empty_thread_map;
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}
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if (evsel->fd == NULL &&
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perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
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return -ENOMEM;
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for (cpu = 0; cpu < cpus->nr; cpu++) {
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for (thread = 0; thread < threads->nr; thread++) {
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int fd, group_fd, *evsel_fd;
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evsel_fd = FD(evsel, cpu, thread);
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if (evsel_fd == NULL)
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return -EINVAL;
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err = get_group_fd(evsel, cpu, thread, &group_fd);
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if (err < 0)
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return err;
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fd = sys_perf_event_open(&evsel->attr,
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threads->map[thread].pid,
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cpus->map[cpu], group_fd, 0);
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if (fd < 0)
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return -errno;
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*evsel_fd = fd;
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}
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}
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return err;
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}
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static void perf_evsel__close_fd_cpu(struct perf_evsel *evsel, int cpu)
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{
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int thread;
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for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
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int *fd = FD(evsel, cpu, thread);
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if (fd && *fd >= 0) {
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close(*fd);
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*fd = -1;
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}
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}
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}
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void perf_evsel__close_fd(struct perf_evsel *evsel)
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{
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int cpu;
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for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
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perf_evsel__close_fd_cpu(evsel, cpu);
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}
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void perf_evsel__free_fd(struct perf_evsel *evsel)
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{
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xyarray__delete(evsel->fd);
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evsel->fd = NULL;
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}
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void perf_evsel__close(struct perf_evsel *evsel)
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{
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if (evsel->fd == NULL)
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return;
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perf_evsel__close_fd(evsel);
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perf_evsel__free_fd(evsel);
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}
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void perf_evsel__close_cpu(struct perf_evsel *evsel, int cpu)
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{
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if (evsel->fd == NULL)
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return;
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perf_evsel__close_fd_cpu(evsel, cpu);
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}
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void perf_evsel__munmap(struct perf_evsel *evsel)
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{
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int cpu, thread;
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if (evsel->fd == NULL || evsel->mmap == NULL)
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return;
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for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
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for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
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int *fd = FD(evsel, cpu, thread);
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if (fd == NULL || *fd < 0)
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continue;
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perf_mmap__munmap(MMAP(evsel, cpu, thread));
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}
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}
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xyarray__delete(evsel->mmap);
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evsel->mmap = NULL;
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}
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int perf_evsel__mmap(struct perf_evsel *evsel, int pages)
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{
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int ret, cpu, thread;
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struct perf_mmap_param mp = {
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.prot = PROT_READ | PROT_WRITE,
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.mask = (pages * page_size) - 1,
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};
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if (evsel->fd == NULL || evsel->mmap)
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return -EINVAL;
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if (perf_evsel__alloc_mmap(evsel, xyarray__max_x(evsel->fd), xyarray__max_y(evsel->fd)) < 0)
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return -ENOMEM;
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for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
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for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
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int *fd = FD(evsel, cpu, thread);
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struct perf_mmap *map;
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if (fd == NULL || *fd < 0)
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continue;
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map = MMAP(evsel, cpu, thread);
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perf_mmap__init(map, NULL, false, NULL);
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ret = perf_mmap__mmap(map, &mp, *fd, cpu);
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if (ret) {
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perf_evsel__munmap(evsel);
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return ret;
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}
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}
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}
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return 0;
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}
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void *perf_evsel__mmap_base(struct perf_evsel *evsel, int cpu, int thread)
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{
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int *fd = FD(evsel, cpu, thread);
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if (fd == NULL || *fd < 0 || MMAP(evsel, cpu, thread) == NULL)
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return NULL;
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return MMAP(evsel, cpu, thread)->base;
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}
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int perf_evsel__read_size(struct perf_evsel *evsel)
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{
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u64 read_format = evsel->attr.read_format;
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int entry = sizeof(u64); /* value */
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int size = 0;
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int nr = 1;
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if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
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size += sizeof(u64);
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if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
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size += sizeof(u64);
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if (read_format & PERF_FORMAT_ID)
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entry += sizeof(u64);
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if (read_format & PERF_FORMAT_GROUP) {
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nr = evsel->nr_members;
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size += sizeof(u64);
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}
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size += entry * nr;
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return size;
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}
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int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
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struct perf_counts_values *count)
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{
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size_t size = perf_evsel__read_size(evsel);
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int *fd = FD(evsel, cpu, thread);
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memset(count, 0, sizeof(*count));
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if (fd == NULL || *fd < 0)
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return -EINVAL;
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if (MMAP(evsel, cpu, thread) &&
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!perf_mmap__read_self(MMAP(evsel, cpu, thread), count))
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return 0;
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if (readn(*fd, count->values, size) <= 0)
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return -errno;
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return 0;
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}
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static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
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int ioc, void *arg,
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int cpu)
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{
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int thread;
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for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
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int err;
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int *fd = FD(evsel, cpu, thread);
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if (fd == NULL || *fd < 0)
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return -1;
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err = ioctl(*fd, ioc, arg);
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if (err)
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return err;
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}
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return 0;
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}
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int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu)
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{
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return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, cpu);
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}
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int perf_evsel__enable(struct perf_evsel *evsel)
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{
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int i;
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int err = 0;
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for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++)
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err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, i);
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return err;
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}
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int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu)
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{
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return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, cpu);
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}
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int perf_evsel__disable(struct perf_evsel *evsel)
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{
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int i;
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int err = 0;
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for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++)
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err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, i);
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return err;
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}
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int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
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{
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int err = 0, i;
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for (i = 0; i < evsel->cpus->nr && !err; i++)
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err = perf_evsel__run_ioctl(evsel,
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PERF_EVENT_IOC_SET_FILTER,
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(void *)filter, i);
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return err;
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}
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struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel)
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{
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return evsel->cpus;
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}
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struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel)
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{
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return evsel->threads;
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}
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struct perf_event_attr *perf_evsel__attr(struct perf_evsel *evsel)
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{
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return &evsel->attr;
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}
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int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
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{
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if (ncpus == 0 || nthreads == 0)
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return 0;
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if (evsel->system_wide)
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nthreads = 1;
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evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
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if (evsel->sample_id == NULL)
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return -ENOMEM;
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evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
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if (evsel->id == NULL) {
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xyarray__delete(evsel->sample_id);
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evsel->sample_id = NULL;
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return -ENOMEM;
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}
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return 0;
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}
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void perf_evsel__free_id(struct perf_evsel *evsel)
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{
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xyarray__delete(evsel->sample_id);
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evsel->sample_id = NULL;
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zfree(&evsel->id);
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evsel->ids = 0;
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}
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