8 #include "util/ftrace.h"
9 #include "util/cpumap.h"
10 #include "util/thread_map.h"
11 #include "util/debug.h"
12 #include "util/evlist.h"
13 #include "util/bpf_counter.h"
15 #include "util/bpf_skel/func_latency.skel.h"
17 static struct func_latency_bpf *skel;
19 int perf_ftrace__latency_prepare_bpf(struct perf_ftrace *ftrace)
22 int i, ncpus = 1, ntasks = 1;
23 struct filter_entry *func;
25 if (!list_is_singular(&ftrace->filters)) {
26 pr_err("ERROR: %s target function(s).\n",
27 list_empty(&ftrace->filters) ? "No" : "Too many");
31 func = list_first_entry(&ftrace->filters, struct filter_entry, list);
33 skel = func_latency_bpf__open();
35 pr_err("Failed to open func latency skeleton\n");
39 /* don't need to set cpu filter for system-wide mode */
40 if (ftrace->target.cpu_list) {
41 ncpus = perf_cpu_map__nr(ftrace->evlist->core.user_requested_cpus);
42 bpf_map__set_max_entries(skel->maps.cpu_filter, ncpus);
45 if (target__has_task(&ftrace->target) || target__none(&ftrace->target)) {
46 ntasks = perf_thread_map__nr(ftrace->evlist->core.threads);
47 bpf_map__set_max_entries(skel->maps.task_filter, ntasks);
52 err = func_latency_bpf__load(skel);
54 pr_err("Failed to load func latency skeleton\n");
58 if (ftrace->target.cpu_list) {
62 skel->bss->has_cpu = 1;
63 fd = bpf_map__fd(skel->maps.cpu_filter);
65 for (i = 0; i < ncpus; i++) {
66 cpu = perf_cpu_map__cpu(ftrace->evlist->core.user_requested_cpus, i).cpu;
67 bpf_map_update_elem(fd, &cpu, &val, BPF_ANY);
71 if (target__has_task(&ftrace->target) || target__none(&ftrace->target)) {
75 skel->bss->has_task = 1;
76 fd = bpf_map__fd(skel->maps.task_filter);
78 for (i = 0; i < ntasks; i++) {
79 pid = perf_thread_map__pid(ftrace->evlist->core.threads, i);
80 bpf_map_update_elem(fd, &pid, &val, BPF_ANY);
84 skel->bss->use_nsec = ftrace->use_nsec;
86 skel->links.func_begin = bpf_program__attach_kprobe(skel->progs.func_begin,
88 if (IS_ERR(skel->links.func_begin)) {
89 pr_err("Failed to attach fentry program\n");
90 err = PTR_ERR(skel->links.func_begin);
94 skel->links.func_end = bpf_program__attach_kprobe(skel->progs.func_end,
96 if (IS_ERR(skel->links.func_end)) {
97 pr_err("Failed to attach fexit program\n");
98 err = PTR_ERR(skel->links.func_end);
102 /* XXX: we don't actually use this fd - just for poll() */
103 return open("/dev/null", O_RDONLY);
109 int perf_ftrace__latency_start_bpf(struct perf_ftrace *ftrace __maybe_unused)
111 skel->bss->enabled = 1;
115 int perf_ftrace__latency_stop_bpf(struct perf_ftrace *ftrace __maybe_unused)
117 skel->bss->enabled = 0;
121 int perf_ftrace__latency_read_bpf(struct perf_ftrace *ftrace __maybe_unused,
127 int ncpus = cpu__max_cpu().cpu;
129 fd = bpf_map__fd(skel->maps.latency);
131 hist = calloc(ncpus, sizeof(*hist));
135 for (idx = 0; idx < NUM_BUCKET; idx++) {
136 err = bpf_map_lookup_elem(fd, &idx, hist);
142 for (i = 0; i < ncpus; i++)
143 buckets[idx] += hist[i];
150 int perf_ftrace__latency_cleanup_bpf(struct perf_ftrace *ftrace __maybe_unused)
152 func_latency_bpf__destroy(skel);