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
13 #include "debug.h"
14 #include "parse-events.h"
15 #include "evlist.h"
16 #include "evsel.h"
17 #include "thread_map.h"
18 #include "record.h"
19 #include "tsc.h"
20 #include "util/mmap.h"
21 #include "tests/tests.h"
22
23 #include "arch-tests.h"
24
25 #define CHECK__(x) { \
26 while ((x) < 0) { \
27 pr_debug(#x " failed!\n"); \
28 goto out_err; \
29 } \
30 }
31
32 #define CHECK_NOT_NULL__(x) { \
33 while ((x) == NULL) { \
34 pr_debug(#x " failed!\n"); \
35 goto out_err; \
36 } \
37 }
38
39 /**
40 * test__perf_time_to_tsc - test converting perf time to TSC.
41 *
42 * This function implements a test that checks that the conversion of perf time
43 * to and from TSC is consistent with the order of events. If the test passes
44 * %0 is returned, otherwise %-1 is returned. If TSC conversion is not
45 * supported then then the test passes but " (not supported)" is printed.
46 */
test__perf_time_to_tsc(struct test * test __maybe_unused,int subtest __maybe_unused)47 int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe_unused)
48 {
49 struct record_opts opts = {
50 .mmap_pages = UINT_MAX,
51 .user_freq = UINT_MAX,
52 .user_interval = ULLONG_MAX,
53 .target = {
54 .uses_mmap = true,
55 },
56 .sample_time = true,
57 };
58 struct perf_thread_map *threads = NULL;
59 struct perf_cpu_map *cpus = NULL;
60 struct evlist *evlist = NULL;
61 struct 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 struct mmap *md;
70
71 threads = thread_map__new(-1, getpid(), UINT_MAX);
72 CHECK_NOT_NULL__(threads);
73
74 cpus = perf_cpu_map__new(NULL);
75 CHECK_NOT_NULL__(cpus);
76
77 evlist = evlist__new();
78 CHECK_NOT_NULL__(evlist);
79
80 perf_evlist__set_maps(&evlist->core, cpus, threads);
81
82 CHECK__(parse_events(evlist, "cycles:u", NULL));
83
84 perf_evlist__config(evlist, &opts, NULL);
85
86 evsel = evlist__first(evlist);
87
88 evsel->core.attr.comm = 1;
89 evsel->core.attr.disabled = 1;
90 evsel->core.attr.enable_on_exec = 0;
91
92 CHECK__(evlist__open(evlist));
93
94 CHECK__(evlist__mmap(evlist, UINT_MAX));
95
96 pc = evlist->mmap[0].core.base;
97 ret = perf_read_tsc_conversion(pc, &tc);
98 if (ret) {
99 if (ret == -EOPNOTSUPP) {
100 fprintf(stderr, " (not supported)");
101 return 0;
102 }
103 goto out_err;
104 }
105
106 evlist__enable(evlist);
107
108 comm1 = "Test COMM 1";
109 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
110
111 test_tsc = rdtsc();
112
113 comm2 = "Test COMM 2";
114 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
115
116 evlist__disable(evlist);
117
118 for (i = 0; i < evlist->core.nr_mmaps; i++) {
119 md = &evlist->mmap[i];
120 if (perf_mmap__read_init(md) < 0)
121 continue;
122
123 while ((event = perf_mmap__read_event(md)) != NULL) {
124 struct perf_sample sample;
125
126 if (event->header.type != PERF_RECORD_COMM ||
127 (pid_t)event->comm.pid != getpid() ||
128 (pid_t)event->comm.tid != getpid())
129 goto next_event;
130
131 if (strcmp(event->comm.comm, comm1) == 0) {
132 CHECK__(perf_evsel__parse_sample(evsel, event,
133 &sample));
134 comm1_time = sample.time;
135 }
136 if (strcmp(event->comm.comm, comm2) == 0) {
137 CHECK__(perf_evsel__parse_sample(evsel, event,
138 &sample));
139 comm2_time = sample.time;
140 }
141 next_event:
142 perf_mmap__consume(md);
143 }
144 perf_mmap__read_done(md);
145 }
146
147 if (!comm1_time || !comm2_time)
148 goto out_err;
149
150 test_time = tsc_to_perf_time(test_tsc, &tc);
151 comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
152 comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
153
154 pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
155 comm1_time, comm1_tsc);
156 pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n",
157 test_time, test_tsc);
158 pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
159 comm2_time, comm2_tsc);
160
161 if (test_time <= comm1_time ||
162 test_time >= comm2_time)
163 goto out_err;
164
165 if (test_tsc <= comm1_tsc ||
166 test_tsc >= comm2_tsc)
167 goto out_err;
168
169 err = 0;
170
171 out_err:
172 evlist__delete(evlist);
173 return err;
174 }
175