155 lines
3.5 KiB
C
155 lines
3.5 KiB
C
#include <stdio.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <linux/err.h>
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#include "util/ftrace.h"
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#include "util/cpumap.h"
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#include "util/thread_map.h"
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#include "util/debug.h"
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#include "util/evlist.h"
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#include "util/bpf_counter.h"
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#include "util/bpf_skel/func_latency.skel.h"
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static struct func_latency_bpf *skel;
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int perf_ftrace__latency_prepare_bpf(struct perf_ftrace *ftrace)
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{
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int fd, err;
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int i, ncpus = 1, ntasks = 1;
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struct filter_entry *func;
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if (!list_is_singular(&ftrace->filters)) {
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pr_err("ERROR: %s target function(s).\n",
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list_empty(&ftrace->filters) ? "No" : "Too many");
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return -1;
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}
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func = list_first_entry(&ftrace->filters, struct filter_entry, list);
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skel = func_latency_bpf__open();
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if (!skel) {
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pr_err("Failed to open func latency skeleton\n");
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return -1;
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}
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/* don't need to set cpu filter for system-wide mode */
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if (ftrace->target.cpu_list) {
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ncpus = perf_cpu_map__nr(ftrace->evlist->core.user_requested_cpus);
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bpf_map__set_max_entries(skel->maps.cpu_filter, ncpus);
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skel->rodata->has_cpu = 1;
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}
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if (target__has_task(&ftrace->target) || target__none(&ftrace->target)) {
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ntasks = perf_thread_map__nr(ftrace->evlist->core.threads);
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bpf_map__set_max_entries(skel->maps.task_filter, ntasks);
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skel->rodata->has_task = 1;
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}
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skel->rodata->use_nsec = ftrace->use_nsec;
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set_max_rlimit();
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err = func_latency_bpf__load(skel);
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if (err) {
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pr_err("Failed to load func latency skeleton\n");
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goto out;
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}
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if (ftrace->target.cpu_list) {
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u32 cpu;
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u8 val = 1;
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fd = bpf_map__fd(skel->maps.cpu_filter);
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for (i = 0; i < ncpus; i++) {
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cpu = perf_cpu_map__cpu(ftrace->evlist->core.user_requested_cpus, i).cpu;
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bpf_map_update_elem(fd, &cpu, &val, BPF_ANY);
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}
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}
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if (target__has_task(&ftrace->target) || target__none(&ftrace->target)) {
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u32 pid;
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u8 val = 1;
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fd = bpf_map__fd(skel->maps.task_filter);
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for (i = 0; i < ntasks; i++) {
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pid = perf_thread_map__pid(ftrace->evlist->core.threads, i);
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bpf_map_update_elem(fd, &pid, &val, BPF_ANY);
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}
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}
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skel->links.func_begin = bpf_program__attach_kprobe(skel->progs.func_begin,
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false, func->name);
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if (IS_ERR(skel->links.func_begin)) {
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pr_err("Failed to attach fentry program\n");
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err = PTR_ERR(skel->links.func_begin);
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goto out;
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}
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skel->links.func_end = bpf_program__attach_kprobe(skel->progs.func_end,
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true, func->name);
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if (IS_ERR(skel->links.func_end)) {
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pr_err("Failed to attach fexit program\n");
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err = PTR_ERR(skel->links.func_end);
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goto out;
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}
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/* XXX: we don't actually use this fd - just for poll() */
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return open("/dev/null", O_RDONLY);
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out:
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return err;
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}
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int perf_ftrace__latency_start_bpf(struct perf_ftrace *ftrace __maybe_unused)
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{
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skel->bss->enabled = 1;
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return 0;
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}
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int perf_ftrace__latency_stop_bpf(struct perf_ftrace *ftrace __maybe_unused)
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{
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skel->bss->enabled = 0;
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return 0;
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}
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int perf_ftrace__latency_read_bpf(struct perf_ftrace *ftrace __maybe_unused,
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int buckets[])
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{
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int i, fd, err;
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u32 idx;
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u64 *hist;
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int ncpus = cpu__max_cpu().cpu;
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fd = bpf_map__fd(skel->maps.latency);
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hist = calloc(ncpus, sizeof(*hist));
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if (hist == NULL)
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return -ENOMEM;
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for (idx = 0; idx < NUM_BUCKET; idx++) {
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err = bpf_map_lookup_elem(fd, &idx, hist);
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if (err) {
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buckets[idx] = 0;
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continue;
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}
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for (i = 0; i < ncpus; i++)
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buckets[idx] += hist[i];
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}
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free(hist);
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return 0;
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}
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int perf_ftrace__latency_cleanup_bpf(struct perf_ftrace *ftrace __maybe_unused)
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{
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func_latency_bpf__destroy(skel);
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return 0;
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}
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