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 #include "pmu-hybrid.h"
25
26 /*
27 * Except x86_64/i386 and Arm64, other archs don't support TSC in perf. Just
28 * enable the test for x86_64/i386 and Arm64 archs.
29 */
30 #if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__)
31 #define TSC_IS_SUPPORTED 1
32 #else
33 #define TSC_IS_SUPPORTED 0
34 #endif
35
36 #define CHECK__(x) { \
37 while ((x) < 0) { \
38 pr_debug(#x " failed!\n"); \
39 goto out_err; \
40 } \
41 }
42
43 #define CHECK_NOT_NULL__(x) { \
44 while ((x) == NULL) { \
45 pr_debug(#x " failed!\n"); \
46 goto out_err; \
47 } \
48 }
49
50 /**
51 * test__perf_time_to_tsc - test converting perf time to TSC.
52 *
53 * This function implements a test that checks that the conversion of perf time
54 * to and from TSC is consistent with the order of events. If the test passes
55 * %0 is returned, otherwise %-1 is returned. If TSC conversion is not
56 * supported then then the test passes but " (not supported)" is printed.
57 */
test__perf_time_to_tsc(struct test_suite * test __maybe_unused,int subtest __maybe_unused)58 static int test__perf_time_to_tsc(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
59 {
60 struct record_opts opts = {
61 .mmap_pages = UINT_MAX,
62 .user_freq = UINT_MAX,
63 .user_interval = ULLONG_MAX,
64 .target = {
65 .uses_mmap = true,
66 },
67 .sample_time = true,
68 };
69 struct perf_thread_map *threads = NULL;
70 struct perf_cpu_map *cpus = NULL;
71 struct evlist *evlist = NULL;
72 struct evsel *evsel = NULL;
73 int err = -1, ret, i;
74 const char *comm1, *comm2;
75 struct perf_tsc_conversion tc;
76 struct perf_event_mmap_page *pc;
77 union perf_event *event;
78 u64 test_tsc, comm1_tsc, comm2_tsc;
79 u64 test_time, comm1_time = 0, comm2_time = 0;
80 struct mmap *md;
81
82 if (!TSC_IS_SUPPORTED) {
83 pr_debug("Test not supported on this architecture");
84 return TEST_SKIP;
85 }
86
87 threads = thread_map__new(-1, getpid(), UINT_MAX);
88 CHECK_NOT_NULL__(threads);
89
90 cpus = perf_cpu_map__new(NULL);
91 CHECK_NOT_NULL__(cpus);
92
93 evlist = evlist__new();
94 CHECK_NOT_NULL__(evlist);
95
96 perf_evlist__set_maps(&evlist->core, cpus, threads);
97
98 CHECK__(parse_events(evlist, "cycles:u", NULL));
99
100 evlist__config(evlist, &opts, NULL);
101
102 evsel = evlist__first(evlist);
103
104 evsel->core.attr.comm = 1;
105 evsel->core.attr.disabled = 1;
106 evsel->core.attr.enable_on_exec = 0;
107
108 /*
109 * For hybrid "cycles:u", it creates two events.
110 * Init the second evsel here.
111 */
112 if (perf_pmu__has_hybrid() && perf_pmu__hybrid_mounted("cpu_atom")) {
113 evsel = evsel__next(evsel);
114 evsel->core.attr.comm = 1;
115 evsel->core.attr.disabled = 1;
116 evsel->core.attr.enable_on_exec = 0;
117 }
118
119 CHECK__(evlist__open(evlist));
120
121 CHECK__(evlist__mmap(evlist, UINT_MAX));
122
123 pc = evlist->mmap[0].core.base;
124 ret = perf_read_tsc_conversion(pc, &tc);
125 if (ret) {
126 if (ret == -EOPNOTSUPP) {
127 fprintf(stderr, " (not supported)");
128 return 0;
129 }
130 goto out_err;
131 }
132
133 evlist__enable(evlist);
134
135 comm1 = "Test COMM 1";
136 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
137
138 test_tsc = rdtsc();
139
140 comm2 = "Test COMM 2";
141 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
142
143 evlist__disable(evlist);
144
145 for (i = 0; i < evlist->core.nr_mmaps; i++) {
146 md = &evlist->mmap[i];
147 if (perf_mmap__read_init(&md->core) < 0)
148 continue;
149
150 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
151 struct perf_sample sample;
152
153 if (event->header.type != PERF_RECORD_COMM ||
154 (pid_t)event->comm.pid != getpid() ||
155 (pid_t)event->comm.tid != getpid())
156 goto next_event;
157
158 if (strcmp(event->comm.comm, comm1) == 0) {
159 CHECK__(evsel__parse_sample(evsel, event, &sample));
160 comm1_time = sample.time;
161 }
162 if (strcmp(event->comm.comm, comm2) == 0) {
163 CHECK__(evsel__parse_sample(evsel, event, &sample));
164 comm2_time = sample.time;
165 }
166 next_event:
167 perf_mmap__consume(&md->core);
168 }
169 perf_mmap__read_done(&md->core);
170 }
171
172 if (!comm1_time || !comm2_time)
173 goto out_err;
174
175 test_time = tsc_to_perf_time(test_tsc, &tc);
176 comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
177 comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
178
179 pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
180 comm1_time, comm1_tsc);
181 pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n",
182 test_time, test_tsc);
183 pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
184 comm2_time, comm2_tsc);
185
186 if (test_time <= comm1_time ||
187 test_time >= comm2_time)
188 goto out_err;
189
190 if (test_tsc <= comm1_tsc ||
191 test_tsc >= comm2_tsc)
192 goto out_err;
193
194 err = 0;
195
196 out_err:
197 evlist__delete(evlist);
198 perf_cpu_map__put(cpus);
199 perf_thread_map__put(threads);
200 return err;
201 }
202
203 DEFINE_SUITE("Convert perf time to TSC", perf_time_to_tsc);
204