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/mmap.h" 16 #include "util/thread_map.h" 17 #include <perf/evlist.h> 18 19 #define NR_LOOPS 10000000 20 21 /* 22 * This test will open software clock events (cpu-clock, task-clock) 23 * then check their frequency -> period conversion has no artifact of 24 * setting period to 1 forcefully. 25 */ 26 static int __test__sw_clock_freq(enum perf_sw_ids clock_id) 27 { 28 int i, err = -1; 29 volatile int tmp = 0; 30 u64 total_periods = 0; 31 int nr_samples = 0; 32 char sbuf[STRERR_BUFSIZE]; 33 union perf_event *event; 34 struct evsel *evsel; 35 struct evlist *evlist; 36 struct perf_event_attr attr = { 37 .type = PERF_TYPE_SOFTWARE, 38 .config = clock_id, 39 .sample_type = PERF_SAMPLE_PERIOD, 40 .exclude_kernel = 1, 41 .disabled = 1, 42 .freq = 1, 43 }; 44 struct perf_cpu_map *cpus; 45 struct perf_thread_map *threads; 46 struct mmap *md; 47 48 attr.sample_freq = 500; 49 50 evlist = evlist__new(); 51 if (evlist == NULL) { 52 pr_debug("evlist__new\n"); 53 return -1; 54 } 55 56 evsel = evsel__new(&attr); 57 if (evsel == NULL) { 58 pr_debug("perf_evsel__new\n"); 59 goto out_delete_evlist; 60 } 61 evlist__add(evlist, evsel); 62 63 cpus = perf_cpu_map__dummy_new(); 64 threads = thread_map__new_by_tid(getpid()); 65 if (!cpus || !threads) { 66 err = -ENOMEM; 67 pr_debug("Not enough memory to create thread/cpu maps\n"); 68 goto out_free_maps; 69 } 70 71 perf_evlist__set_maps(&evlist->core, cpus, threads); 72 73 cpus = NULL; 74 threads = NULL; 75 76 if (evlist__open(evlist)) { 77 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; 78 79 err = -errno; 80 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", 81 str_error_r(errno, sbuf, sizeof(sbuf)), 82 knob, (u64)attr.sample_freq); 83 goto out_delete_evlist; 84 } 85 86 err = evlist__mmap(evlist, 128); 87 if (err < 0) { 88 pr_debug("failed to mmap event: %d (%s)\n", errno, 89 str_error_r(errno, sbuf, sizeof(sbuf))); 90 goto out_delete_evlist; 91 } 92 93 evlist__enable(evlist); 94 95 /* collect samples */ 96 for (i = 0; i < NR_LOOPS; i++) 97 tmp++; 98 99 evlist__disable(evlist); 100 101 md = &evlist->mmap[0]; 102 if (perf_mmap__read_init(md) < 0) 103 goto out_init; 104 105 while ((event = perf_mmap__read_event(md)) != NULL) { 106 struct perf_sample sample; 107 108 if (event->header.type != PERF_RECORD_SAMPLE) 109 goto next_event; 110 111 err = perf_evlist__parse_sample(evlist, event, &sample); 112 if (err < 0) { 113 pr_debug("Error during parse sample\n"); 114 goto out_delete_evlist; 115 } 116 117 total_periods += sample.period; 118 nr_samples++; 119 next_event: 120 perf_mmap__consume(md); 121 } 122 perf_mmap__read_done(md); 123 124 out_init: 125 if ((u64) nr_samples == total_periods) { 126 pr_debug("All (%d) samples have period value of 1!\n", 127 nr_samples); 128 err = -1; 129 } 130 131 out_free_maps: 132 perf_cpu_map__put(cpus); 133 perf_thread_map__put(threads); 134 out_delete_evlist: 135 evlist__delete(evlist); 136 return err; 137 } 138 139 int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused) 140 { 141 int ret; 142 143 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); 144 if (!ret) 145 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); 146 147 return ret; 148 } 149