1 // SPDX-License-Identifier: GPL-2.0
2 #include <errno.h>
3 #include <inttypes.h>
4 #include <stdio.h>
5 #include <unistd.h>
6 #include <linux/types.h>
7 #include <sys/prctl.h>
8
9 #include "parse-events.h"
10 #include "evlist.h"
11 #include "evsel.h"
12 #include "thread_map.h"
13 #include "cpumap.h"
14 #include "tsc.h"
15 #include "tests/tests.h"
16
17 #include "arch-tests.h"
18
19 #define CHECK__(x) { \
20 while ((x) < 0) { \
21 pr_debug(#x " failed!\n"); \
22 goto out_err; \
23 } \
24 }
25
26 #define CHECK_NOT_NULL__(x) { \
27 while ((x) == NULL) { \
28 pr_debug(#x " failed!\n"); \
29 goto out_err; \
30 } \
31 }
32
33 /**
34 * test__perf_time_to_tsc - test converting perf time to TSC.
35 *
36 * This function implements a test that checks that the conversion of perf time
37 * to and from TSC is consistent with the order of events. If the test passes
38 * %0 is returned, otherwise %-1 is returned. If TSC conversion is not
39 * supported then then the test passes but " (not supported)" is printed.
40 */
test__perf_time_to_tsc(struct test * test __maybe_unused,int subtest __maybe_unused)41 int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe_unused)
42 {
43 struct record_opts opts = {
44 .mmap_pages = UINT_MAX,
45 .user_freq = UINT_MAX,
46 .user_interval = ULLONG_MAX,
47 .target = {
48 .uses_mmap = true,
49 },
50 .sample_time = true,
51 };
52 struct thread_map *threads = NULL;
53 struct cpu_map *cpus = NULL;
54 struct perf_evlist *evlist = NULL;
55 struct perf_evsel *evsel = NULL;
56 int err = -1, ret, i;
57 const char *comm1, *comm2;
58 struct perf_tsc_conversion tc;
59 struct perf_event_mmap_page *pc;
60 union perf_event *event;
61 u64 test_tsc, comm1_tsc, comm2_tsc;
62 u64 test_time, comm1_time = 0, comm2_time = 0;
63 struct perf_mmap *md;
64
65 threads = thread_map__new(-1, getpid(), UINT_MAX);
66 CHECK_NOT_NULL__(threads);
67
68 cpus = cpu_map__new(NULL);
69 CHECK_NOT_NULL__(cpus);
70
71 evlist = perf_evlist__new();
72 CHECK_NOT_NULL__(evlist);
73
74 perf_evlist__set_maps(evlist, cpus, threads);
75
76 CHECK__(parse_events(evlist, "cycles:u", NULL));
77
78 perf_evlist__config(evlist, &opts, NULL);
79
80 evsel = perf_evlist__first(evlist);
81
82 evsel->attr.comm = 1;
83 evsel->attr.disabled = 1;
84 evsel->attr.enable_on_exec = 0;
85
86 CHECK__(perf_evlist__open(evlist));
87
88 CHECK__(perf_evlist__mmap(evlist, UINT_MAX));
89
90 pc = evlist->mmap[0].base;
91 ret = perf_read_tsc_conversion(pc, &tc);
92 if (ret) {
93 if (ret == -EOPNOTSUPP) {
94 fprintf(stderr, " (not supported)");
95 return 0;
96 }
97 goto out_err;
98 }
99
100 perf_evlist__enable(evlist);
101
102 comm1 = "Test COMM 1";
103 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
104
105 test_tsc = rdtsc();
106
107 comm2 = "Test COMM 2";
108 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
109
110 perf_evlist__disable(evlist);
111
112 for (i = 0; i < evlist->nr_mmaps; i++) {
113 md = &evlist->mmap[i];
114 if (perf_mmap__read_init(md) < 0)
115 continue;
116
117 while ((event = perf_mmap__read_event(md)) != NULL) {
118 struct perf_sample sample;
119
120 if (event->header.type != PERF_RECORD_COMM ||
121 (pid_t)event->comm.pid != getpid() ||
122 (pid_t)event->comm.tid != getpid())
123 goto next_event;
124
125 if (strcmp(event->comm.comm, comm1) == 0) {
126 CHECK__(perf_evsel__parse_sample(evsel, event,
127 &sample));
128 comm1_time = sample.time;
129 }
130 if (strcmp(event->comm.comm, comm2) == 0) {
131 CHECK__(perf_evsel__parse_sample(evsel, event,
132 &sample));
133 comm2_time = sample.time;
134 }
135 next_event:
136 perf_mmap__consume(md);
137 }
138 perf_mmap__read_done(md);
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 perf_evlist__delete(evlist);
167 return err;
168 }
169
