1 #include <stdio.h>
2 #include <unistd.h>
3 #include <linux/types.h>
4 #include <sys/prctl.h>
5
6 #include "parse-events.h"
7 #include "evlist.h"
8 #include "evsel.h"
9 #include "thread_map.h"
10 #include "cpumap.h"
11 #include "tsc.h"
12 #include "tests/tests.h"
13
14 #include "arch-tests.h"
15
16 #define CHECK__(x) { \
17 while ((x) < 0) { \
18 pr_debug(#x " failed!\n"); \
19 goto out_err; \
20 } \
21 }
22
23 #define CHECK_NOT_NULL__(x) { \
24 while ((x) == NULL) { \
25 pr_debug(#x " failed!\n"); \
26 goto out_err; \
27 } \
28 }
29
30 /**
31 * test__perf_time_to_tsc - test converting perf time to TSC.
32 *
33 * This function implements a test that checks that the conversion of perf time
34 * to and from TSC is consistent with the order of events. If the test passes
35 * %0 is returned, otherwise %-1 is returned. If TSC conversion is not
36 * supported then then the test passes but " (not supported)" is printed.
37 */
test__perf_time_to_tsc(int subtest __maybe_unused)38 int test__perf_time_to_tsc(int subtest __maybe_unused)
39 {
40 struct record_opts opts = {
41 .mmap_pages = UINT_MAX,
42 .user_freq = UINT_MAX,
43 .user_interval = ULLONG_MAX,
44 .target = {
45 .uses_mmap = true,
46 },
47 .sample_time = true,
48 };
49 struct thread_map *threads = NULL;
50 struct cpu_map *cpus = NULL;
51 struct perf_evlist *evlist = NULL;
52 struct perf_evsel *evsel = NULL;
53 int err = -1, ret, i;
54 const char *comm1, *comm2;
55 struct perf_tsc_conversion tc;
56 struct perf_event_mmap_page *pc;
57 union perf_event *event;
58 u64 test_tsc, comm1_tsc, comm2_tsc;
59 u64 test_time, comm1_time = 0, comm2_time = 0;
60
61 threads = thread_map__new(-1, getpid(), UINT_MAX);
62 CHECK_NOT_NULL__(threads);
63
64 cpus = cpu_map__new(NULL);
65 CHECK_NOT_NULL__(cpus);
66
67 evlist = perf_evlist__new();
68 CHECK_NOT_NULL__(evlist);
69
70 perf_evlist__set_maps(evlist, cpus, threads);
71
72 CHECK__(parse_events(evlist, "cycles:u", NULL));
73
74 perf_evlist__config(evlist, &opts, NULL);
75
76 evsel = perf_evlist__first(evlist);
77
78 evsel->attr.comm = 1;
79 evsel->attr.disabled = 1;
80 evsel->attr.enable_on_exec = 0;
81
82 CHECK__(perf_evlist__open(evlist));
83
84 CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));
85
86 pc = evlist->mmap[0].base;
87 ret = perf_read_tsc_conversion(pc, &tc);
88 if (ret) {
89 if (ret == -EOPNOTSUPP) {
90 fprintf(stderr, " (not supported)");
91 return 0;
92 }
93 goto out_err;
94 }
95
96 perf_evlist__enable(evlist);
97
98 comm1 = "Test COMM 1";
99 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
100
101 test_tsc = rdtsc();
102
103 comm2 = "Test COMM 2";
104 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
105
106 perf_evlist__disable(evlist);
107
108 for (i = 0; i < evlist->nr_mmaps; i++) {
109 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
110 struct perf_sample sample;
111
112 if (event->header.type != PERF_RECORD_COMM ||
113 (pid_t)event->comm.pid != getpid() ||
114 (pid_t)event->comm.tid != getpid())
115 goto next_event;
116
117 if (strcmp(event->comm.comm, comm1) == 0) {
118 CHECK__(perf_evsel__parse_sample(evsel, event,
119 &sample));
120 comm1_time = sample.time;
121 }
122 if (strcmp(event->comm.comm, comm2) == 0) {
123 CHECK__(perf_evsel__parse_sample(evsel, event,
124 &sample));
125 comm2_time = sample.time;
126 }
127 next_event:
128 perf_evlist__mmap_consume(evlist, i);
129 }
130 }
131
132 if (!comm1_time || !comm2_time)
133 goto out_err;
134
135 test_time = tsc_to_perf_time(test_tsc, &tc);
136 comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
137 comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
138
139 pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
140 comm1_time, comm1_tsc);
141 pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n",
142 test_time, test_tsc);
143 pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
144 comm2_time, comm2_tsc);
145
146 if (test_time <= comm1_time ||
147 test_time >= comm2_time)
148 goto out_err;
149
150 if (test_tsc <= comm1_tsc ||
151 test_tsc >= comm2_tsc)
152 goto out_err;
153
154 err = 0;
155
156 out_err:
157 perf_evlist__delete(evlist);
158 return err;
159 }
160