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