1 #include <stdio.h> 2 #include <unistd.h> 3 #include <linux/types.h> 4 #include <sys/prctl.h> 5 6 #include "parse-events.h" 7 #include "evlist.h" 8 #include "evsel.h" 9 #include "thread_map.h" 10 #include "cpumap.h" 11 #include "tsc.h" 12 #include "tests.h" 13 14 #define CHECK__(x) { \ 15 while ((x) < 0) { \ 16 pr_debug(#x " failed!\n"); \ 17 goto out_err; \ 18 } \ 19 } 20 21 #define CHECK_NOT_NULL__(x) { \ 22 while ((x) == NULL) { \ 23 pr_debug(#x " failed!\n"); \ 24 goto out_err; \ 25 } \ 26 } 27 28 /** 29 * test__perf_time_to_tsc - test converting perf time to TSC. 30 * 31 * This function implements a test that checks that the conversion of perf time 32 * to and from TSC is consistent with the order of events. If the test passes 33 * %0 is returned, otherwise %-1 is returned. If TSC conversion is not 34 * supported then then the test passes but " (not supported)" is printed. 35 */ 36 int test__perf_time_to_tsc(void) 37 { 38 struct record_opts opts = { 39 .mmap_pages = UINT_MAX, 40 .user_freq = UINT_MAX, 41 .user_interval = ULLONG_MAX, 42 .freq = 4000, 43 .target = { 44 .uses_mmap = true, 45 }, 46 .sample_time = true, 47 }; 48 struct thread_map *threads = NULL; 49 struct cpu_map *cpus = NULL; 50 struct perf_evlist *evlist = NULL; 51 struct perf_evsel *evsel = NULL; 52 int err = -1, ret, i; 53 const char *comm1, *comm2; 54 struct perf_tsc_conversion tc; 55 struct perf_event_mmap_page *pc; 56 union perf_event *event; 57 u64 test_tsc, comm1_tsc, comm2_tsc; 58 u64 test_time, comm1_time = 0, comm2_time = 0; 59 60 threads = thread_map__new(-1, getpid(), UINT_MAX); 61 CHECK_NOT_NULL__(threads); 62 63 cpus = cpu_map__new(NULL); 64 CHECK_NOT_NULL__(cpus); 65 66 evlist = perf_evlist__new(); 67 CHECK_NOT_NULL__(evlist); 68 69 perf_evlist__set_maps(evlist, cpus, threads); 70 71 CHECK__(parse_events(evlist, "cycles:u")); 72 73 perf_evlist__config(evlist, &opts); 74 75 evsel = perf_evlist__first(evlist); 76 77 evsel->attr.comm = 1; 78 evsel->attr.disabled = 1; 79 evsel->attr.enable_on_exec = 0; 80 81 CHECK__(perf_evlist__open(evlist)); 82 83 CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false)); 84 85 pc = evlist->mmap[0].base; 86 ret = perf_read_tsc_conversion(pc, &tc); 87 if (ret) { 88 if (ret == -EOPNOTSUPP) { 89 fprintf(stderr, " (not supported)"); 90 return 0; 91 } 92 goto out_err; 93 } 94 95 perf_evlist__enable(evlist); 96 97 comm1 = "Test COMM 1"; 98 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0)); 99 100 test_tsc = rdtsc(); 101 102 comm2 = "Test COMM 2"; 103 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0)); 104 105 perf_evlist__disable(evlist); 106 107 for (i = 0; i < evlist->nr_mmaps; i++) { 108 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) { 109 struct perf_sample sample; 110 111 if (event->header.type != PERF_RECORD_COMM || 112 (pid_t)event->comm.pid != getpid() || 113 (pid_t)event->comm.tid != getpid()) 114 goto next_event; 115 116 if (strcmp(event->comm.comm, comm1) == 0) { 117 CHECK__(perf_evsel__parse_sample(evsel, event, 118 &sample)); 119 comm1_time = sample.time; 120 } 121 if (strcmp(event->comm.comm, comm2) == 0) { 122 CHECK__(perf_evsel__parse_sample(evsel, event, 123 &sample)); 124 comm2_time = sample.time; 125 } 126 next_event: 127 perf_evlist__mmap_consume(evlist, i); 128 } 129 } 130 131 if (!comm1_time || !comm2_time) 132 goto out_err; 133 134 test_time = tsc_to_perf_time(test_tsc, &tc); 135 comm1_tsc = perf_time_to_tsc(comm1_time, &tc); 136 comm2_tsc = perf_time_to_tsc(comm2_time, &tc); 137 138 pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n", 139 comm1_time, comm1_tsc); 140 pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n", 141 test_time, test_tsc); 142 pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n", 143 comm2_time, comm2_tsc); 144 145 if (test_time <= comm1_time || 146 test_time >= comm2_time) 147 goto out_err; 148 149 if (test_tsc <= comm1_tsc || 150 test_tsc >= comm2_tsc) 151 goto out_err; 152 153 err = 0; 154 155 out_err: 156 if (evlist) { 157 perf_evlist__disable(evlist); 158 perf_evlist__delete(evlist); 159 } 160 161 return err; 162 } 163