1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/types.h>
10 #include <perf/cpumap.h>
11 #include <perf/evlist.h>
12 #include <perf/mmap.h>
15 #include "parse-events.h"
18 #include "thread_map.h"
24 #include "pmu-hybrid.h"
26 #define CHECK__(x) { \
28 pr_debug(#x " failed!\n"); \
33 #define CHECK_NOT_NULL__(x) { \
34 while ((x) == NULL) { \
35 pr_debug(#x " failed!\n"); \
41 * test__perf_time_to_tsc - test converting perf time to TSC.
43 * This function implements a test that checks that the conversion of perf time
44 * to and from TSC is consistent with the order of events. If the test passes
45 * %0 is returned, otherwise %-1 is returned. If TSC conversion is not
46 * supported then then the test passes but " (not supported)" is printed.
48 static int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe_unused)
50 struct record_opts opts = {
51 .mmap_pages = UINT_MAX,
52 .user_freq = UINT_MAX,
53 .user_interval = ULLONG_MAX,
59 struct perf_thread_map *threads = NULL;
60 struct perf_cpu_map *cpus = NULL;
61 struct evlist *evlist = NULL;
62 struct evsel *evsel = NULL;
64 const char *comm1, *comm2;
65 struct perf_tsc_conversion tc;
66 struct perf_event_mmap_page *pc;
67 union perf_event *event;
68 u64 test_tsc, comm1_tsc, comm2_tsc;
69 u64 test_time, comm1_time = 0, comm2_time = 0;
72 threads = thread_map__new(-1, getpid(), UINT_MAX);
73 CHECK_NOT_NULL__(threads);
75 cpus = perf_cpu_map__new(NULL);
76 CHECK_NOT_NULL__(cpus);
78 evlist = evlist__new();
79 CHECK_NOT_NULL__(evlist);
81 perf_evlist__set_maps(&evlist->core, cpus, threads);
83 CHECK__(parse_events(evlist, "cycles:u", NULL));
85 evlist__config(evlist, &opts, NULL);
87 evsel = evlist__first(evlist);
89 evsel->core.attr.comm = 1;
90 evsel->core.attr.disabled = 1;
91 evsel->core.attr.enable_on_exec = 0;
94 * For hybrid "cycles:u", it creates two events.
95 * Init the second evsel here.
97 if (perf_pmu__has_hybrid() && perf_pmu__hybrid_mounted("cpu_atom")) {
98 evsel = evsel__next(evsel);
99 evsel->core.attr.comm = 1;
100 evsel->core.attr.disabled = 1;
101 evsel->core.attr.enable_on_exec = 0;
104 CHECK__(evlist__open(evlist));
106 CHECK__(evlist__mmap(evlist, UINT_MAX));
108 pc = evlist->mmap[0].core.base;
109 ret = perf_read_tsc_conversion(pc, &tc);
111 if (ret == -EOPNOTSUPP) {
112 fprintf(stderr, " (not supported)");
118 evlist__enable(evlist);
120 comm1 = "Test COMM 1";
121 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
125 comm2 = "Test COMM 2";
126 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
128 evlist__disable(evlist);
130 for (i = 0; i < evlist->core.nr_mmaps; i++) {
131 md = &evlist->mmap[i];
132 if (perf_mmap__read_init(&md->core) < 0)
135 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
136 struct perf_sample sample;
138 if (event->header.type != PERF_RECORD_COMM ||
139 (pid_t)event->comm.pid != getpid() ||
140 (pid_t)event->comm.tid != getpid())
143 if (strcmp(event->comm.comm, comm1) == 0) {
144 CHECK__(evsel__parse_sample(evsel, event, &sample));
145 comm1_time = sample.time;
147 if (strcmp(event->comm.comm, comm2) == 0) {
148 CHECK__(evsel__parse_sample(evsel, event, &sample));
149 comm2_time = sample.time;
152 perf_mmap__consume(&md->core);
154 perf_mmap__read_done(&md->core);
157 if (!comm1_time || !comm2_time)
160 test_time = tsc_to_perf_time(test_tsc, &tc);
161 comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
162 comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
164 pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
165 comm1_time, comm1_tsc);
166 pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n",
167 test_time, test_tsc);
168 pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
169 comm2_time, comm2_tsc);
171 if (test_time <= comm1_time ||
172 test_time >= comm2_time)
175 if (test_tsc <= comm1_tsc ||
176 test_tsc >= comm2_tsc)
182 evlist__delete(evlist);
183 perf_cpu_map__put(cpus);
184 perf_thread_map__put(threads);
188 static bool test__tsc_is_supported(void)
191 * Except x86_64/i386 and Arm64, other archs don't support TSC in perf.
192 * Just enable the test for x86_64/i386 and Arm64 archs.
194 #if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__)
201 struct test suite__perf_time_to_tsc = {
202 .desc = "Convert perf time to TSC",
203 .func = test__perf_time_to_tsc,
204 .is_supported = test__tsc_is_supported,