1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <inttypes.h> 4 #include <limits.h> 5 #include <stdbool.h> 6 #include <stdio.h> 7 #include <unistd.h> 8 #include <linux/types.h> 9 #include <sys/prctl.h> 10 #include <perf/cpumap.h> 11 #include <perf/evlist.h> 12 #include <perf/mmap.h> 13 14 #include "debug.h" 15 #include "parse-events.h" 16 #include "evlist.h" 17 #include "evsel.h" 18 #include "thread_map.h" 19 #include "record.h" 20 #include "tsc.h" 21 #include "mmap.h" 22 #include "tests.h" 23 #include "util/sample.h" 24 25 /* 26 * Except x86_64/i386 and Arm64, other archs don't support TSC in perf. Just 27 * enable the test for x86_64/i386 and Arm64 archs. 28 */ 29 #if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__) 30 #define TSC_IS_SUPPORTED 1 31 #else 32 #define TSC_IS_SUPPORTED 0 33 #endif 34 35 #define CHECK__(x) { \ 36 while ((x) < 0) { \ 37 pr_debug(#x " failed!\n"); \ 38 goto out_err; \ 39 } \ 40 } 41 42 #define CHECK_NOT_NULL__(x) { \ 43 while ((x) == NULL) { \ 44 pr_debug(#x " failed!\n"); \ 45 goto out_err; \ 46 } \ 47 } 48 49 static int test__tsc_is_supported(struct test_suite *test __maybe_unused, 50 int subtest __maybe_unused) 51 { 52 if (!TSC_IS_SUPPORTED) { 53 pr_debug("Test not supported on this architecture\n"); 54 return TEST_SKIP; 55 } 56 57 return TEST_OK; 58 } 59 60 /** 61 * test__perf_time_to_tsc - test converting perf time to TSC. 62 * 63 * This function implements a test that checks that the conversion of perf time 64 * to and from TSC is consistent with the order of events. If the test passes 65 * %0 is returned, otherwise %-1 is returned. If TSC conversion is not 66 * supported then the test passes but " (not supported)" is printed. 67 */ 68 static int test__perf_time_to_tsc(struct test_suite *test __maybe_unused, int subtest __maybe_unused) 69 { 70 struct record_opts opts = { 71 .mmap_pages = UINT_MAX, 72 .user_freq = UINT_MAX, 73 .user_interval = ULLONG_MAX, 74 .target = { 75 .uses_mmap = true, 76 }, 77 .sample_time = true, 78 }; 79 struct perf_thread_map *threads = NULL; 80 struct perf_cpu_map *cpus = NULL; 81 struct evlist *evlist = NULL; 82 struct evsel *evsel = NULL; 83 int err = TEST_FAIL, ret, i; 84 const char *comm1, *comm2; 85 struct perf_tsc_conversion tc; 86 struct perf_event_mmap_page *pc; 87 union perf_event *event; 88 u64 test_tsc, comm1_tsc, comm2_tsc; 89 u64 test_time, comm1_time = 0, comm2_time = 0; 90 struct mmap *md; 91 92 93 threads = thread_map__new(-1, getpid(), UINT_MAX); 94 CHECK_NOT_NULL__(threads); 95 96 cpus = perf_cpu_map__new_online_cpus(); 97 CHECK_NOT_NULL__(cpus); 98 99 evlist = evlist__new(); 100 CHECK_NOT_NULL__(evlist); 101 102 perf_evlist__set_maps(&evlist->core, cpus, threads); 103 104 CHECK__(parse_event(evlist, "cycles:u")); 105 106 evlist__config(evlist, &opts, NULL); 107 108 /* For hybrid "cycles:u", it creates two events */ 109 evlist__for_each_entry(evlist, evsel) { 110 evsel->core.attr.comm = 1; 111 evsel->core.attr.disabled = 1; 112 evsel->core.attr.enable_on_exec = 0; 113 } 114 115 ret = evlist__open(evlist); 116 if (ret < 0) { 117 if (ret == -ENOENT) 118 err = TEST_SKIP; 119 else 120 pr_debug("evlist__open() failed\n"); 121 goto out_err; 122 } 123 124 CHECK__(evlist__mmap(evlist, UINT_MAX)); 125 126 pc = evlist->mmap[0].core.base; 127 ret = perf_read_tsc_conversion(pc, &tc); 128 if (ret) { 129 if (ret == -EOPNOTSUPP) { 130 pr_debug("perf_read_tsc_conversion is not supported in current kernel\n"); 131 err = TEST_SKIP; 132 } 133 goto out_err; 134 } 135 136 evlist__enable(evlist); 137 138 comm1 = "Test COMM 1"; 139 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0)); 140 141 test_tsc = rdtsc(); 142 143 comm2 = "Test COMM 2"; 144 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0)); 145 146 evlist__disable(evlist); 147 148 for (i = 0; i < evlist->core.nr_mmaps; i++) { 149 md = &evlist->mmap[i]; 150 if (perf_mmap__read_init(&md->core) < 0) 151 continue; 152 153 while ((event = perf_mmap__read_event(&md->core)) != NULL) { 154 struct perf_sample sample; 155 156 if (event->header.type != PERF_RECORD_COMM || 157 (pid_t)event->comm.pid != getpid() || 158 (pid_t)event->comm.tid != getpid()) 159 goto next_event; 160 161 if (strcmp(event->comm.comm, comm1) == 0) { 162 CHECK_NOT_NULL__(evsel = evlist__event2evsel(evlist, event)); 163 CHECK__(evsel__parse_sample(evsel, event, &sample)); 164 comm1_time = sample.time; 165 } 166 if (strcmp(event->comm.comm, comm2) == 0) { 167 CHECK_NOT_NULL__(evsel = evlist__event2evsel(evlist, event)); 168 CHECK__(evsel__parse_sample(evsel, event, &sample)); 169 comm2_time = sample.time; 170 } 171 next_event: 172 perf_mmap__consume(&md->core); 173 } 174 perf_mmap__read_done(&md->core); 175 } 176 177 if (!comm1_time || !comm2_time) 178 goto out_err; 179 180 test_time = tsc_to_perf_time(test_tsc, &tc); 181 comm1_tsc = perf_time_to_tsc(comm1_time, &tc); 182 comm2_tsc = perf_time_to_tsc(comm2_time, &tc); 183 184 pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n", 185 comm1_time, comm1_tsc); 186 pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n", 187 test_time, test_tsc); 188 pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n", 189 comm2_time, comm2_tsc); 190 191 if (test_time <= comm1_time || 192 test_time >= comm2_time) 193 goto out_err; 194 195 if (test_tsc <= comm1_tsc || 196 test_tsc >= comm2_tsc) 197 goto out_err; 198 199 err = TEST_OK; 200 201 out_err: 202 evlist__delete(evlist); 203 perf_cpu_map__put(cpus); 204 perf_thread_map__put(threads); 205 return err; 206 } 207 208 static struct test_case time_to_tsc_tests[] = { 209 TEST_CASE_REASON("TSC support", tsc_is_supported, 210 "This architecture does not support"), 211 TEST_CASE_REASON("Perf time to TSC", perf_time_to_tsc, 212 "perf_read_tsc_conversion is not supported"), 213 { .name = NULL, } 214 }; 215 216 struct test_suite suite__perf_time_to_tsc = { 217 .desc = "Convert perf time to TSC", 218 .test_cases = time_to_tsc_tests, 219 }; 220