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 43 attr.sample_freq = 500; 44 45 evlist = perf_evlist__new(); 46 if (evlist == NULL) { 47 pr_debug("perf_evlist__new\n"); 48 return -1; 49 } 50 51 evsel = perf_evsel__new(&attr); 52 if (evsel == NULL) { 53 pr_debug("perf_evsel__new\n"); 54 goto out_delete_evlist; 55 } 56 perf_evlist__add(evlist, evsel); 57 58 cpus = cpu_map__dummy_new(); 59 threads = thread_map__new_by_tid(getpid()); 60 if (!cpus || !threads) { 61 err = -ENOMEM; 62 pr_debug("Not enough memory to create thread/cpu maps\n"); 63 goto out_free_maps; 64 } 65 66 perf_evlist__set_maps(evlist, cpus, threads); 67 68 cpus = NULL; 69 threads = NULL; 70 71 if (perf_evlist__open(evlist)) { 72 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; 73 74 err = -errno; 75 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", 76 str_error_r(errno, sbuf, sizeof(sbuf)), 77 knob, (u64)attr.sample_freq); 78 goto out_delete_evlist; 79 } 80 81 err = perf_evlist__mmap(evlist, 128); 82 if (err < 0) { 83 pr_debug("failed to mmap event: %d (%s)\n", errno, 84 str_error_r(errno, sbuf, sizeof(sbuf))); 85 goto out_delete_evlist; 86 } 87 88 perf_evlist__enable(evlist); 89 90 /* collect samples */ 91 for (i = 0; i < NR_LOOPS; i++) 92 tmp++; 93 94 perf_evlist__disable(evlist); 95 96 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { 97 struct perf_sample sample; 98 99 if (event->header.type != PERF_RECORD_SAMPLE) 100 goto next_event; 101 102 err = perf_evlist__parse_sample(evlist, event, &sample); 103 if (err < 0) { 104 pr_debug("Error during parse sample\n"); 105 goto out_delete_evlist; 106 } 107 108 total_periods += sample.period; 109 nr_samples++; 110 next_event: 111 perf_evlist__mmap_consume(evlist, 0); 112 } 113 114 if ((u64) nr_samples == total_periods) { 115 pr_debug("All (%d) samples have period value of 1!\n", 116 nr_samples); 117 err = -1; 118 } 119 120 out_free_maps: 121 cpu_map__put(cpus); 122 thread_map__put(threads); 123 out_delete_evlist: 124 perf_evlist__delete(evlist); 125 return err; 126 } 127 128 int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused) 129 { 130 int ret; 131 132 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); 133 if (!ret) 134 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); 135 136 return ret; 137 } 138