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 #include <perf/mmap.h> 19 20 #define NR_LOOPS 10000000 21 22 /* 23 * This test will open software clock events (cpu-clock, task-clock) 24 * then check their frequency -> period conversion has no artifact of 25 * setting period to 1 forcefully. 26 */ 27 static int __test__sw_clock_freq(enum perf_sw_ids clock_id) 28 { 29 int i, err = -1; 30 volatile int tmp = 0; 31 u64 total_periods = 0; 32 int nr_samples = 0; 33 char sbuf[STRERR_BUFSIZE]; 34 union perf_event *event; 35 struct evsel *evsel; 36 struct evlist *evlist; 37 struct perf_event_attr attr = { 38 .type = PERF_TYPE_SOFTWARE, 39 .config = clock_id, 40 .sample_type = PERF_SAMPLE_PERIOD, 41 .exclude_kernel = 1, 42 .disabled = 1, 43 .freq = 1, 44 }; 45 struct perf_cpu_map *cpus; 46 struct perf_thread_map *threads; 47 struct mmap *md; 48 49 attr.sample_freq = 500; 50 51 evlist = evlist__new(); 52 if (evlist == NULL) { 53 pr_debug("evlist__new\n"); 54 return -1; 55 } 56 57 evsel = evsel__new(&attr); 58 if (evsel == NULL) { 59 pr_debug("evsel__new\n"); 60 goto out_delete_evlist; 61 } 62 evlist__add(evlist, evsel); 63 64 cpus = perf_cpu_map__dummy_new(); 65 threads = thread_map__new_by_tid(getpid()); 66 if (!cpus || !threads) { 67 err = -ENOMEM; 68 pr_debug("Not enough memory to create thread/cpu maps\n"); 69 goto out_free_maps; 70 } 71 72 perf_evlist__set_maps(&evlist->core, cpus, threads); 73 74 cpus = NULL; 75 threads = NULL; 76 77 if (evlist__open(evlist)) { 78 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; 79 80 err = -errno; 81 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", 82 str_error_r(errno, sbuf, sizeof(sbuf)), 83 knob, (u64)attr.sample_freq); 84 goto out_delete_evlist; 85 } 86 87 err = evlist__mmap(evlist, 128); 88 if (err < 0) { 89 pr_debug("failed to mmap event: %d (%s)\n", errno, 90 str_error_r(errno, sbuf, sizeof(sbuf))); 91 goto out_delete_evlist; 92 } 93 94 evlist__enable(evlist); 95 96 /* collect samples */ 97 for (i = 0; i < NR_LOOPS; i++) 98 tmp++; 99 100 evlist__disable(evlist); 101 102 md = &evlist->mmap[0]; 103 if (perf_mmap__read_init(&md->core) < 0) 104 goto out_init; 105 106 while ((event = perf_mmap__read_event(&md->core)) != NULL) { 107 struct perf_sample sample; 108 109 if (event->header.type != PERF_RECORD_SAMPLE) 110 goto next_event; 111 112 err = evlist__parse_sample(evlist, event, &sample); 113 if (err < 0) { 114 pr_debug("Error during parse sample\n"); 115 goto out_delete_evlist; 116 } 117 118 total_periods += sample.period; 119 nr_samples++; 120 next_event: 121 perf_mmap__consume(&md->core); 122 } 123 perf_mmap__read_done(&md->core); 124 125 out_init: 126 if ((u64) nr_samples == total_periods) { 127 pr_debug("All (%d) samples have period value of 1!\n", 128 nr_samples); 129 err = -1; 130 } 131 132 out_free_maps: 133 perf_cpu_map__put(cpus); 134 perf_thread_map__put(threads); 135 out_delete_evlist: 136 evlist__delete(evlist); 137 return err; 138 } 139 140 int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused) 141 { 142 int ret; 143 144 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); 145 if (!ret) 146 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); 147 148 return ret; 149 } 150