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