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/sample.h" 17 #include "util/thread_map.h" 18 #include <perf/evlist.h> 19 #include <perf/mmap.h> 20 21 #define NR_LOOPS 10000000 22 23 /* 24 * This test will open software clock events (cpu-clock, task-clock) 25 * then check their frequency -> period conversion has no artifact of 26 * setting period to 1 forcefully. 27 */ 28 static int __test__sw_clock_freq(enum perf_sw_ids clock_id) 29 { 30 int i, err = -1; 31 volatile int tmp = 0; 32 u64 total_periods = 0; 33 int nr_samples = 0; 34 char sbuf[STRERR_BUFSIZE]; 35 union perf_event *event; 36 struct evsel *evsel; 37 struct evlist *evlist; 38 struct perf_event_attr attr = { 39 .type = PERF_TYPE_SOFTWARE, 40 .config = clock_id, 41 .sample_type = PERF_SAMPLE_PERIOD, 42 .exclude_kernel = 1, 43 .disabled = 1, 44 .freq = 1, 45 }; 46 struct perf_cpu_map *cpus = NULL; 47 struct perf_thread_map *threads = NULL; 48 struct mmap *md; 49 50 attr.sample_freq = 500; 51 52 evlist = evlist__new(); 53 if (evlist == NULL) { 54 pr_debug("evlist__new\n"); 55 return -1; 56 } 57 58 evsel = evsel__new(&attr); 59 if (evsel == NULL) { 60 pr_debug("evsel__new\n"); 61 goto out_delete_evlist; 62 } 63 evlist__add(evlist, evsel); 64 65 cpus = perf_cpu_map__dummy_new(); 66 threads = thread_map__new_by_tid(getpid()); 67 if (!cpus || !threads) { 68 err = -ENOMEM; 69 pr_debug("Not enough memory to create thread/cpu maps\n"); 70 goto out_delete_evlist; 71 } 72 73 perf_evlist__set_maps(&evlist->core, cpus, threads); 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 = 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->core) < 0) 102 goto out_init; 103 104 while ((event = perf_mmap__read_event(&md->core)) != NULL) { 105 struct perf_sample sample; 106 107 if (event->header.type != PERF_RECORD_SAMPLE) 108 goto next_event; 109 110 err = 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->core); 120 } 121 perf_mmap__read_done(&md->core); 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_delete_evlist: 131 perf_cpu_map__put(cpus); 132 perf_thread_map__put(threads); 133 evlist__delete(evlist); 134 return err; 135 } 136 137 static int test__sw_clock_freq(struct test_suite *test __maybe_unused, int subtest __maybe_unused) 138 { 139 int ret; 140 141 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); 142 if (!ret) 143 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); 144 145 return ret; 146 } 147 148 DEFINE_SUITE("Software clock events period values", sw_clock_freq); 149