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