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      1 #include "evlist.h"
      2 #include "evsel.h"
      3 #include "cpumap.h"
      4 #include "parse-events.h"
      5 
      6 typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel);
      7 
      8 static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str)
      9 {
     10 	struct perf_evlist *evlist;
     11 	struct perf_evsel *evsel;
     12 	int err = -EAGAIN, fd;
     13 
     14 	evlist = perf_evlist__new();
     15 	if (!evlist)
     16 		return -ENOMEM;
     17 
     18 	if (parse_events(evlist, str))
     19 		goto out_delete;
     20 
     21 	evsel = perf_evlist__first(evlist);
     22 
     23 	fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
     24 	if (fd < 0)
     25 		goto out_delete;
     26 	close(fd);
     27 
     28 	fn(evsel);
     29 
     30 	fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
     31 	if (fd < 0) {
     32 		if (errno == EINVAL)
     33 			err = -EINVAL;
     34 		goto out_delete;
     35 	}
     36 	close(fd);
     37 	err = 0;
     38 
     39 out_delete:
     40 	perf_evlist__delete(evlist);
     41 	return err;
     42 }
     43 
     44 static bool perf_probe_api(setup_probe_fn_t fn)
     45 {
     46 	const char *try[] = {"cycles:u", "instructions:u", "cpu-clock", NULL};
     47 	struct cpu_map *cpus;
     48 	int cpu, ret, i = 0;
     49 
     50 	cpus = cpu_map__new(NULL);
     51 	if (!cpus)
     52 		return false;
     53 	cpu = cpus->map[0];
     54 	cpu_map__delete(cpus);
     55 
     56 	do {
     57 		ret = perf_do_probe_api(fn, cpu, try[i++]);
     58 		if (!ret)
     59 			return true;
     60 	} while (ret == -EAGAIN && try[i]);
     61 
     62 	return false;
     63 }
     64 
     65 static void perf_probe_sample_identifier(struct perf_evsel *evsel)
     66 {
     67 	evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER;
     68 }
     69 
     70 bool perf_can_sample_identifier(void)
     71 {
     72 	return perf_probe_api(perf_probe_sample_identifier);
     73 }
     74 
     75 void perf_evlist__config(struct perf_evlist *evlist,
     76 			struct perf_record_opts *opts)
     77 {
     78 	struct perf_evsel *evsel;
     79 	bool use_sample_identifier = false;
     80 
     81 	/*
     82 	 * Set the evsel leader links before we configure attributes,
     83 	 * since some might depend on this info.
     84 	 */
     85 	if (opts->group)
     86 		perf_evlist__set_leader(evlist);
     87 
     88 	if (evlist->cpus->map[0] < 0)
     89 		opts->no_inherit = true;
     90 
     91 	list_for_each_entry(evsel, &evlist->entries, node)
     92 		perf_evsel__config(evsel, opts);
     93 
     94 	if (evlist->nr_entries > 1) {
     95 		struct perf_evsel *first = perf_evlist__first(evlist);
     96 
     97 		list_for_each_entry(evsel, &evlist->entries, node) {
     98 			if (evsel->attr.sample_type == first->attr.sample_type)
     99 				continue;
    100 			use_sample_identifier = perf_can_sample_identifier();
    101 			break;
    102 		}
    103 		list_for_each_entry(evsel, &evlist->entries, node)
    104 			perf_evsel__set_sample_id(evsel, use_sample_identifier);
    105 	}
    106 
    107 	perf_evlist__set_id_pos(evlist);
    108 }
    109