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