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(void)38 int test__perf_time_to_tsc(void)
39 {
40 struct record_opts opts = {
41 .mmap_pages = UINT_MAX,
42 .user_freq = UINT_MAX,
43 .user_interval = ULLONG_MAX,
44 .freq = 4000,
45 .target = {
46 .uses_mmap = true,
47 },
48 .sample_time = true,
49 };
50 struct thread_map *threads = NULL;
51 struct cpu_map *cpus = NULL;
52 struct perf_evlist *evlist = NULL;
53 struct perf_evsel *evsel = NULL;
54 int err = -1, ret, i;
55 const char *comm1, *comm2;
56 struct perf_tsc_conversion tc;
57 struct perf_event_mmap_page *pc;
58 union perf_event *event;
59 u64 test_tsc, comm1_tsc, comm2_tsc;
60 u64 test_time, comm1_time = 0, comm2_time = 0;
61
62 threads = thread_map__new(-1, getpid(), UINT_MAX);
63 CHECK_NOT_NULL__(threads);
64
65 cpus = cpu_map__new(NULL);
66 CHECK_NOT_NULL__(cpus);
67
68 evlist = perf_evlist__new();
69 CHECK_NOT_NULL__(evlist);
70
71 perf_evlist__set_maps(evlist, cpus, threads);
72
73 CHECK__(parse_events(evlist, "cycles:u", NULL));
74
75 perf_evlist__config(evlist, &opts);
76
77 evsel = perf_evlist__first(evlist);
78
79 evsel->attr.comm = 1;
80 evsel->attr.disabled = 1;
81 evsel->attr.enable_on_exec = 0;
82
83 CHECK__(perf_evlist__open(evlist));
84
85 CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));
86
87 pc = evlist->mmap[0].base;
88 ret = perf_read_tsc_conversion(pc, &tc);
89 if (ret) {
90 if (ret == -EOPNOTSUPP) {
91 fprintf(stderr, " (not supported)");
92 return 0;
93 }
94 goto out_err;
95 }
96
97 perf_evlist__enable(evlist);
98
99 comm1 = "Test COMM 1";
100 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
101
102 test_tsc = rdtsc();
103
104 comm2 = "Test COMM 2";
105 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
106
107 perf_evlist__disable(evlist);
108
109 for (i = 0; i < evlist->nr_mmaps; i++) {
110 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
111 struct perf_sample sample;
112
113 if (event->header.type != PERF_RECORD_COMM ||
114 (pid_t)event->comm.pid != getpid() ||
115 (pid_t)event->comm.tid != getpid())
116 goto next_event;
117
118 if (strcmp(event->comm.comm, comm1) == 0) {
119 CHECK__(perf_evsel__parse_sample(evsel, event,
120 &sample));
121 comm1_time = sample.time;
122 }
123 if (strcmp(event->comm.comm, comm2) == 0) {
124 CHECK__(perf_evsel__parse_sample(evsel, event,
125 &sample));
126 comm2_time = sample.time;
127 }
128 next_event:
129 perf_evlist__mmap_consume(evlist, i);
130 }
131 }
132
133 if (!comm1_time || !comm2_time)
134 goto out_err;
135
136 test_time = tsc_to_perf_time(test_tsc, &tc);
137 comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
138 comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
139
140 pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
141 comm1_time, comm1_tsc);
142 pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n",
143 test_time, test_tsc);
144 pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
145 comm2_time, comm2_tsc);
146
147 if (test_time <= comm1_time ||
148 test_time >= comm2_time)
149 goto out_err;
150
151 if (test_tsc <= comm1_tsc ||
152 test_tsc >= comm2_tsc)
153 goto out_err;
154
155 err = 0;
156
157 out_err:
158 if (evlist) {
159 perf_evlist__disable(evlist);
160 perf_evlist__delete(evlist);
161 }
162
163 return err;
164 }
165