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 "tests.h" 12 13 #include "../arch/x86/util/tsc.h" 14 15 #define CHECK__(x) { \ 16 while ((x) < 0) { \ 17 pr_debug(#x " failed!\n"); \ 18 goto out_err; \ 19 } \ 20 } 21 22 #define CHECK_NOT_NULL__(x) { \ 23 while ((x) == NULL) { \ 24 pr_debug(#x " failed!\n"); \ 25 goto out_err; \ 26 } \ 27 } 28 29 static u64 rdtsc(void) 30 { 31 unsigned int low, high; 32 33 asm volatile("rdtsc" : "=a" (low), "=d" (high)); 34 35 return low | ((u64)high) << 32; 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(void) 47 { 48 struct record_opts opts = { 49 .mmap_pages = UINT_MAX, 50 .user_freq = UINT_MAX, 51 .user_interval = ULLONG_MAX, 52 .freq = 4000, 53 .target = { 54 .uses_mmap = true, 55 }, 56 .sample_time = true, 57 }; 58 struct thread_map *threads = NULL; 59 struct cpu_map *cpus = NULL; 60 struct perf_evlist *evlist = NULL; 61 struct perf_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 70 threads = thread_map__new(-1, getpid(), UINT_MAX); 71 CHECK_NOT_NULL__(threads); 72 73 cpus = cpu_map__new(NULL); 74 CHECK_NOT_NULL__(cpus); 75 76 evlist = perf_evlist__new(); 77 CHECK_NOT_NULL__(evlist); 78 79 perf_evlist__set_maps(evlist, cpus, threads); 80 81 CHECK__(parse_events(evlist, "cycles:u")); 82 83 perf_evlist__config(evlist, &opts); 84 85 evsel = perf_evlist__first(evlist); 86 87 evsel->attr.comm = 1; 88 evsel->attr.disabled = 1; 89 evsel->attr.enable_on_exec = 0; 90 91 CHECK__(perf_evlist__open(evlist)); 92 93 CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false)); 94 95 pc = evlist->mmap[0].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 perf_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 perf_evlist__disable(evlist); 116 117 for (i = 0; i < evlist->nr_mmaps; i++) { 118 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) { 119 struct perf_sample sample; 120 121 if (event->header.type != PERF_RECORD_COMM || 122 (pid_t)event->comm.pid != getpid() || 123 (pid_t)event->comm.tid != getpid()) 124 goto next_event; 125 126 if (strcmp(event->comm.comm, comm1) == 0) { 127 CHECK__(perf_evsel__parse_sample(evsel, event, 128 &sample)); 129 comm1_time = sample.time; 130 } 131 if (strcmp(event->comm.comm, comm2) == 0) { 132 CHECK__(perf_evsel__parse_sample(evsel, event, 133 &sample)); 134 comm2_time = sample.time; 135 } 136 next_event: 137 perf_evlist__mmap_consume(evlist, i); 138 } 139 } 140 141 if (!comm1_time || !comm2_time) 142 goto out_err; 143 144 test_time = tsc_to_perf_time(test_tsc, &tc); 145 comm1_tsc = perf_time_to_tsc(comm1_time, &tc); 146 comm2_tsc = perf_time_to_tsc(comm2_time, &tc); 147 148 pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n", 149 comm1_time, comm1_tsc); 150 pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n", 151 test_time, test_tsc); 152 pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n", 153 comm2_time, comm2_tsc); 154 155 if (test_time <= comm1_time || 156 test_time >= comm2_time) 157 goto out_err; 158 159 if (test_tsc <= comm1_tsc || 160 test_tsc >= comm2_tsc) 161 goto out_err; 162 163 err = 0; 164 165 out_err: 166 if (evlist) { 167 perf_evlist__disable(evlist); 168 perf_evlist__delete(evlist); 169 } 170 171 return err; 172 } 173