558 lines
12 KiB
C
558 lines
12 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(_evsel, _cpu_map_idx, _thread) \
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((int *)xyarray__entry(_evsel->fd, _cpu_map_idx, _thread))
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#define MMAP(_evsel, _cpu_map_idx, _thread) \
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(_evsel->mmap ? ((struct perf_mmap *) xyarray__entry(_evsel->mmap, _cpu_map_idx, _thread)) \
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: 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 idx, thread;
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for (idx = 0; idx < ncpus; idx++) {
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for (thread = 0; thread < nthreads; thread++) {
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int *fd = FD(evsel, idx, 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, struct perf_cpu 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.cpu, group_fd, flags);
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}
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static int get_group_fd(struct perf_evsel *evsel, int cpu_map_idx, 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_map_idx, 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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struct perf_cpu cpu;
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int idx, 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__new_any_cpu();
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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, perf_cpu_map__nr(cpus), threads->nr) < 0)
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return -ENOMEM;
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perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
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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, idx, thread);
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if (evsel_fd == NULL) {
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err = -EINVAL;
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goto out;
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}
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err = get_group_fd(evsel, idx, thread, &group_fd);
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if (err < 0)
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goto out;
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fd = sys_perf_event_open(&evsel->attr,
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threads->map[thread].pid,
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cpu, group_fd, 0);
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if (fd < 0) {
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err = -errno;
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goto out;
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}
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*evsel_fd = fd;
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}
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}
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out:
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if (err)
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perf_evsel__close(evsel);
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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_map_idx)
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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_map_idx, 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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for (int idx = 0; idx < xyarray__max_x(evsel->fd); idx++)
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perf_evsel__close_fd_cpu(evsel, idx);
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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_map_idx)
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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_map_idx);
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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 idx, thread;
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if (evsel->fd == NULL || evsel->mmap == NULL)
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return;
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for (idx = 0; idx < xyarray__max_x(evsel->fd); idx++) {
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for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
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int *fd = FD(evsel, idx, thread);
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if (fd == NULL || *fd < 0)
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continue;
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perf_mmap__munmap(MMAP(evsel, idx, 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, idx, 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 (idx = 0; idx < xyarray__max_x(evsel->fd); idx++) {
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for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
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int *fd = FD(evsel, idx, thread);
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struct perf_mmap *map;
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struct perf_cpu cpu = perf_cpu_map__cpu(evsel->cpus, idx);
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if (fd == NULL || *fd < 0)
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continue;
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map = MMAP(evsel, idx, 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_map_idx, int thread)
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{
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int *fd = FD(evsel, cpu_map_idx, thread);
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if (fd == NULL || *fd < 0 || MMAP(evsel, cpu_map_idx, thread) == NULL)
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return NULL;
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return MMAP(evsel, cpu_map_idx, 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_LOST)
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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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/* This only reads values for the leader */
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static int perf_evsel__read_group(struct perf_evsel *evsel, int cpu_map_idx,
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int thread, 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_map_idx, thread);
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u64 read_format = evsel->attr.read_format;
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u64 *data;
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int idx = 1;
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if (fd == NULL || *fd < 0)
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return -EINVAL;
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data = calloc(1, size);
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if (data == NULL)
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return -ENOMEM;
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if (readn(*fd, data, size) <= 0) {
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free(data);
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return -errno;
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}
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/*
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* This reads only the leader event intentionally since we don't have
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* perf counts values for sibling events.
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*/
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if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
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count->ena = data[idx++];
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if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
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count->run = data[idx++];
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/* value is always available */
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count->val = data[idx++];
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if (read_format & PERF_FORMAT_ID)
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count->id = data[idx++];
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if (read_format & PERF_FORMAT_LOST)
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count->lost = data[idx++];
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free(data);
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return 0;
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}
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/*
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* The perf read format is very flexible. It needs to set the proper
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* values according to the read format.
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*/
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static void perf_evsel__adjust_values(struct perf_evsel *evsel, u64 *buf,
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struct perf_counts_values *count)
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{
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u64 read_format = evsel->attr.read_format;
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int n = 0;
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count->val = buf[n++];
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if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
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count->ena = buf[n++];
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if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
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count->run = buf[n++];
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if (read_format & PERF_FORMAT_ID)
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count->id = buf[n++];
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if (read_format & PERF_FORMAT_LOST)
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count->lost = buf[n++];
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}
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int perf_evsel__read(struct perf_evsel *evsel, int cpu_map_idx, 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_map_idx, thread);
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u64 read_format = evsel->attr.read_format;
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struct perf_counts_values buf;
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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 (read_format & PERF_FORMAT_GROUP)
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return perf_evsel__read_group(evsel, cpu_map_idx, thread, count);
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if (MMAP(evsel, cpu_map_idx, thread) &&
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!(read_format & (PERF_FORMAT_ID | PERF_FORMAT_LOST)) &&
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!perf_mmap__read_self(MMAP(evsel, cpu_map_idx, thread), count))
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return 0;
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if (readn(*fd, buf.values, size) <= 0)
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return -errno;
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perf_evsel__adjust_values(evsel, buf.values, count);
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return 0;
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}
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static int perf_evsel__ioctl(struct perf_evsel *evsel, int ioc, void *arg,
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int cpu_map_idx, int thread)
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{
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int *fd = FD(evsel, cpu_map_idx, thread);
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if (fd == NULL || *fd < 0)
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return -1;
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return ioctl(*fd, ioc, arg);
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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_map_idx)
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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 = perf_evsel__ioctl(evsel, ioc, arg, cpu_map_idx, thread);
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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_map_idx)
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{
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return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, cpu_map_idx);
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}
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int perf_evsel__enable_thread(struct perf_evsel *evsel, int thread)
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{
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struct perf_cpu cpu __maybe_unused;
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int idx;
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int err;
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perf_cpu_map__for_each_cpu(cpu, idx, evsel->cpus) {
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err = perf_evsel__ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, idx, thread);
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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(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_map_idx)
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{
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return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, cpu_map_idx);
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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 < perf_cpu_map__nr(evsel->cpus) && !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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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;
|
|
zfree(&evsel->id);
|
|
evsel->ids = 0;
|
|
}
|
|
|
|
void perf_counts_values__scale(struct perf_counts_values *count,
|
|
bool scale, __s8 *pscaled)
|
|
{
|
|
s8 scaled = 0;
|
|
|
|
if (scale) {
|
|
if (count->run == 0) {
|
|
scaled = -1;
|
|
count->val = 0;
|
|
} else if (count->run < count->ena) {
|
|
scaled = 1;
|
|
count->val = (u64)((double)count->val * count->ena / count->run);
|
|
}
|
|
}
|
|
|
|
if (pscaled)
|
|
*pscaled = scaled;
|
|
}
|