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 #include <linux/string.h> 9 10 #include "tests.h" 11 #include "util/debug.h" 12 #include "util/evsel.h" 13 #include "util/evlist.h" 14 #include "util/cpumap.h" 15 #include "util/thread_map.h" 16 #include <perf/evlist.h> 17 18 #define NR_LOOPS 10000000 19 20 /* 21 * This test will open software clock events (cpu-clock, task-clock) 22 * then check their frequency -> period conversion has no artifact of 23 * setting period to 1 forcefully. 24 */ 25 static int __test__sw_clock_freq(enum perf_sw_ids clock_id) 26 { 27 int i, err = -1; 28 volatile int tmp = 0; 29 u64 total_periods = 0; 30 int nr_samples = 0; 31 char sbuf[STRERR_BUFSIZE]; 32 union perf_event *event; 33 struct evsel *evsel; 34 struct evlist *evlist; 35 struct perf_event_attr attr = { 36 .type = PERF_TYPE_SOFTWARE, 37 .config = clock_id, 38 .sample_type = PERF_SAMPLE_PERIOD, 39 .exclude_kernel = 1, 40 .disabled = 1, 41 .freq = 1, 42 }; 43 struct perf_cpu_map *cpus; 44 struct perf_thread_map *threads; 45 struct perf_mmap *md; 46 47 attr.sample_freq = 500; 48 49 evlist = evlist__new(); 50 if (evlist == NULL) { 51 pr_debug("evlist__new\n"); 52 return -1; 53 } 54 55 evsel = evsel__new(&attr); 56 if (evsel == NULL) { 57 pr_debug("perf_evsel__new\n"); 58 goto out_delete_evlist; 59 } 60 evlist__add(evlist, evsel); 61 62 cpus = perf_cpu_map__dummy_new(); 63 threads = thread_map__new_by_tid(getpid()); 64 if (!cpus || !threads) { 65 err = -ENOMEM; 66 pr_debug("Not enough memory to create thread/cpu maps\n"); 67 goto out_free_maps; 68 } 69 70 perf_evlist__set_maps(&evlist->core, cpus, threads); 71 72 cpus = NULL; 73 threads = NULL; 74 75 if (evlist__open(evlist)) { 76 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; 77 78 err = -errno; 79 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", 80 str_error_r(errno, sbuf, sizeof(sbuf)), 81 knob, (u64)attr.sample_freq); 82 goto out_delete_evlist; 83 } 84 85 err = perf_evlist__mmap(evlist, 128); 86 if (err < 0) { 87 pr_debug("failed to mmap event: %d (%s)\n", errno, 88 str_error_r(errno, sbuf, sizeof(sbuf))); 89 goto out_delete_evlist; 90 } 91 92 evlist__enable(evlist); 93 94 /* collect samples */ 95 for (i = 0; i < NR_LOOPS; i++) 96 tmp++; 97 98 evlist__disable(evlist); 99 100 md = &evlist->mmap[0]; 101 if (perf_mmap__read_init(md) < 0) 102 goto out_init; 103 104 while ((event = perf_mmap__read_event(md)) != NULL) { 105 struct perf_sample sample; 106 107 if (event->header.type != PERF_RECORD_SAMPLE) 108 goto next_event; 109 110 err = perf_evlist__parse_sample(evlist, event, &sample); 111 if (err < 0) { 112 pr_debug("Error during parse sample\n"); 113 goto out_delete_evlist; 114 } 115 116 total_periods += sample.period; 117 nr_samples++; 118 next_event: 119 perf_mmap__consume(md); 120 } 121 perf_mmap__read_done(md); 122 123 out_init: 124 if ((u64) nr_samples == total_periods) { 125 pr_debug("All (%d) samples have period value of 1!\n", 126 nr_samples); 127 err = -1; 128 } 129 130 out_free_maps: 131 perf_cpu_map__put(cpus); 132 perf_thread_map__put(threads); 133 out_delete_evlist: 134 evlist__delete(evlist); 135 return err; 136 } 137 138 int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused) 139 { 140 int ret; 141 142 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); 143 if (!ret) 144 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); 145 146 return ret; 147 } 148