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 "util/mmap.h"
22 #include "tests/tests.h"
23
24 #include "arch-tests.h"
25
26 #define CHECK__(x) { \
27 while ((x) < 0) { \
28 pr_debug(#x " failed!\n"); \
29 goto out_err; \
30 } \
31 }
32
33 #define CHECK_NOT_NULL__(x) { \
34 while ((x) == NULL) { \
35 pr_debug(#x " failed!\n"); \
36 goto out_err; \
37 } \
38 }
39
40 /**
41 * test__perf_time_to_tsc - test converting perf time to TSC.
42 *
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.
47 */
test__perf_time_to_tsc(struct test * test __maybe_unused,int subtest __maybe_unused)48 int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe_unused)
49 {
50 struct record_opts opts = {
51 .mmap_pages = UINT_MAX,
52 .user_freq = UINT_MAX,
53 .user_interval = ULLONG_MAX,
54 .target = {
55 .uses_mmap = true,
56 },
57 .sample_time = true,
58 };
59 struct perf_thread_map *threads = NULL;
60 struct perf_cpu_map *cpus = NULL;
61 struct evlist *evlist = NULL;
62 struct evsel *evsel = NULL;
63 int err = -1, ret, i;
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;
70 struct mmap *md;
71
72 threads = thread_map__new(-1, getpid(), UINT_MAX);
73 CHECK_NOT_NULL__(threads);
74
75 cpus = perf_cpu_map__new(NULL);
76 CHECK_NOT_NULL__(cpus);
77
78 evlist = evlist__new();
79 CHECK_NOT_NULL__(evlist);
80
81 perf_evlist__set_maps(&evlist->core, cpus, threads);
82
83 CHECK__(parse_events(evlist, "cycles:u", NULL));
84
85 perf_evlist__config(evlist, &opts, NULL);
86
87 evsel = evlist__first(evlist);
88
89 evsel->core.attr.comm = 1;
90 evsel->core.attr.disabled = 1;
91 evsel->core.attr.enable_on_exec = 0;
92
93 CHECK__(evlist__open(evlist));
94
95 CHECK__(evlist__mmap(evlist, UINT_MAX));
96
97 pc = evlist->mmap[0].core.base;
98 ret = perf_read_tsc_conversion(pc, &tc);
99 if (ret) {
100 if (ret == -EOPNOTSUPP) {
101 fprintf(stderr, " (not supported)");
102 return 0;
103 }
104 goto out_err;
105 }
106
107 evlist__enable(evlist);
108
109 comm1 = "Test COMM 1";
110 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
111
112 test_tsc = rdtsc();
113
114 comm2 = "Test COMM 2";
115 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
116
117 evlist__disable(evlist);
118
119 for (i = 0; i < evlist->core.nr_mmaps; i++) {
120 md = &evlist->mmap[i];
121 if (perf_mmap__read_init(&md->core) < 0)
122 continue;
123
124 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
125 struct perf_sample sample;
126
127 if (event->header.type != PERF_RECORD_COMM ||
128 (pid_t)event->comm.pid != getpid() ||
129 (pid_t)event->comm.tid != getpid())
130 goto next_event;
131
132 if (strcmp(event->comm.comm, comm1) == 0) {
133 CHECK__(evsel__parse_sample(evsel, event, &sample));
134 comm1_time = sample.time;
135 }
136 if (strcmp(event->comm.comm, comm2) == 0) {
137 CHECK__(evsel__parse_sample(evsel, event, &sample));
138 comm2_time = sample.time;
139 }
140 next_event:
141 perf_mmap__consume(&md->core);
142 }
143 perf_mmap__read_done(&md->core);
144 }
145
146 if (!comm1_time || !comm2_time)
147 goto out_err;
148
149 test_time = tsc_to_perf_time(test_tsc, &tc);
150 comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
151 comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
152
153 pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
154 comm1_time, comm1_tsc);
155 pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n",
156 test_time, test_tsc);
157 pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
158 comm2_time, comm2_tsc);
159
160 if (test_time <= comm1_time ||
161 test_time >= comm2_time)
162 goto out_err;
163
164 if (test_tsc <= comm1_tsc ||
165 test_tsc >= comm2_tsc)
166 goto out_err;
167
168 err = 0;
169
170 out_err:
171 evlist__delete(evlist);
172 return err;
173 }
174