1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <inttypes.h> 4 #include <unistd.h> 5 #include <stdlib.h> 6 #include <signal.h> 7 #include <sys/mman.h> 8 9 #include "tests.h" 10 #include "util/evsel.h" 11 #include "util/evlist.h" 12 #include "util/cpumap.h" 13 #include "util/thread_map.h" 14 #include <perf/evlist.h> 15 16 #define NR_LOOPS 10000000 17 18 /* 19 * This test will open software clock events (cpu-clock, task-clock) 20 * then check their frequency -> period conversion has no artifact of 21 * setting period to 1 forcefully. 22 */ 23 static int __test__sw_clock_freq(enum perf_sw_ids clock_id) 24 { 25 int i, err = -1; 26 volatile int tmp = 0; 27 u64 total_periods = 0; 28 int nr_samples = 0; 29 char sbuf[STRERR_BUFSIZE]; 30 union perf_event *event; 31 struct evsel *evsel; 32 struct evlist *evlist; 33 struct perf_event_attr attr = { 34 .type = PERF_TYPE_SOFTWARE, 35 .config = clock_id, 36 .sample_type = PERF_SAMPLE_PERIOD, 37 .exclude_kernel = 1, 38 .disabled = 1, 39 .freq = 1, 40 }; 41 struct perf_cpu_map *cpus; 42 struct perf_thread_map *threads; 43 struct perf_mmap *md; 44 45 attr.sample_freq = 500; 46 47 evlist = evlist__new(); 48 if (evlist == NULL) { 49 pr_debug("evlist__new\n"); 50 return -1; 51 } 52 53 evsel = evsel__new(&attr); 54 if (evsel == NULL) { 55 pr_debug("perf_evsel__new\n"); 56 goto out_delete_evlist; 57 } 58 evlist__add(evlist, evsel); 59 60 cpus = perf_cpu_map__dummy_new(); 61 threads = thread_map__new_by_tid(getpid()); 62 if (!cpus || !threads) { 63 err = -ENOMEM; 64 pr_debug("Not enough memory to create thread/cpu maps\n"); 65 goto out_free_maps; 66 } 67 68 perf_evlist__set_maps(&evlist->core, cpus, threads); 69 70 cpus = NULL; 71 threads = NULL; 72 73 if (evlist__open(evlist)) { 74 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; 75 76 err = -errno; 77 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", 78 str_error_r(errno, sbuf, sizeof(sbuf)), 79 knob, (u64)attr.sample_freq); 80 goto out_delete_evlist; 81 } 82 83 err = perf_evlist__mmap(evlist, 128); 84 if (err < 0) { 85 pr_debug("failed to mmap event: %d (%s)\n", errno, 86 str_error_r(errno, sbuf, sizeof(sbuf))); 87 goto out_delete_evlist; 88 } 89 90 evlist__enable(evlist); 91 92 /* collect samples */ 93 for (i = 0; i < NR_LOOPS; i++) 94 tmp++; 95 96 evlist__disable(evlist); 97 98 md = &evlist->mmap[0]; 99 if (perf_mmap__read_init(md) < 0) 100 goto out_init; 101 102 while ((event = perf_mmap__read_event(md)) != NULL) { 103 struct perf_sample sample; 104 105 if (event->header.type != PERF_RECORD_SAMPLE) 106 goto next_event; 107 108 err = perf_evlist__parse_sample(evlist, event, &sample); 109 if (err < 0) { 110 pr_debug("Error during parse sample\n"); 111 goto out_delete_evlist; 112 } 113 114 total_periods += sample.period; 115 nr_samples++; 116 next_event: 117 perf_mmap__consume(md); 118 } 119 perf_mmap__read_done(md); 120 121 out_init: 122 if ((u64) nr_samples == total_periods) { 123 pr_debug("All (%d) samples have period value of 1!\n", 124 nr_samples); 125 err = -1; 126 } 127 128 out_free_maps: 129 perf_cpu_map__put(cpus); 130 perf_thread_map__put(threads); 131 out_delete_evlist: 132 evlist__delete(evlist); 133 return err; 134 } 135 136 int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused) 137 { 138 int ret; 139 140 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); 141 if (!ret) 142 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); 143 144 return ret; 145 } 146