Merge tag 'for-5.11-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[linux-2.6-microblaze.git] / tools / perf / tests / perf-time-to-tsc.c
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 "mmap.h"
22 #include "tests.h"
23
24 #define CHECK__(x) {                            \
25         while ((x) < 0) {                       \
26                 pr_debug(#x " failed!\n");      \
27                 goto out_err;                   \
28         }                                       \
29 }
30
31 #define CHECK_NOT_NULL__(x) {                   \
32         while ((x) == NULL) {                   \
33                 pr_debug(#x " failed!\n");      \
34                 goto out_err;                   \
35         }                                       \
36 }
37
38 /**
39  * test__perf_time_to_tsc - test converting perf time to TSC.
40  *
41  * This function implements a test that checks that the conversion of perf time
42  * to and from TSC is consistent with the order of events.  If the test passes
43  * %0 is returned, otherwise %-1 is returned.  If TSC conversion is not
44  * supported then then the test passes but " (not supported)" is printed.
45  */
46 int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe_unused)
47 {
48         struct record_opts opts = {
49                 .mmap_pages          = UINT_MAX,
50                 .user_freq           = UINT_MAX,
51                 .user_interval       = ULLONG_MAX,
52                 .target              = {
53                         .uses_mmap   = true,
54                 },
55                 .sample_time         = true,
56         };
57         struct perf_thread_map *threads = NULL;
58         struct perf_cpu_map *cpus = NULL;
59         struct evlist *evlist = NULL;
60         struct evsel *evsel = NULL;
61         int err = -1, ret, i;
62         const char *comm1, *comm2;
63         struct perf_tsc_conversion tc;
64         struct perf_event_mmap_page *pc;
65         union perf_event *event;
66         u64 test_tsc, comm1_tsc, comm2_tsc;
67         u64 test_time, comm1_time = 0, comm2_time = 0;
68         struct mmap *md;
69
70         threads = thread_map__new(-1, getpid(), UINT_MAX);
71         CHECK_NOT_NULL__(threads);
72
73         cpus = perf_cpu_map__new(NULL);
74         CHECK_NOT_NULL__(cpus);
75
76         evlist = evlist__new();
77         CHECK_NOT_NULL__(evlist);
78
79         perf_evlist__set_maps(&evlist->core, cpus, threads);
80
81         CHECK__(parse_events(evlist, "cycles:u", NULL));
82
83         evlist__config(evlist, &opts, NULL);
84
85         evsel = evlist__first(evlist);
86
87         evsel->core.attr.comm = 1;
88         evsel->core.attr.disabled = 1;
89         evsel->core.attr.enable_on_exec = 0;
90
91         CHECK__(evlist__open(evlist));
92
93         CHECK__(evlist__mmap(evlist, UINT_MAX));
94
95         pc = evlist->mmap[0].core.base;
96         ret = perf_read_tsc_conversion(pc, &tc);
97         if (ret) {
98                 if (ret == -EOPNOTSUPP) {
99                         fprintf(stderr, " (not supported)");
100                         return 0;
101                 }
102                 goto out_err;
103         }
104
105         evlist__enable(evlist);
106
107         comm1 = "Test COMM 1";
108         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
109
110         test_tsc = rdtsc();
111
112         comm2 = "Test COMM 2";
113         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
114
115         evlist__disable(evlist);
116
117         for (i = 0; i < evlist->core.nr_mmaps; i++) {
118                 md = &evlist->mmap[i];
119                 if (perf_mmap__read_init(&md->core) < 0)
120                         continue;
121
122                 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
123                         struct perf_sample sample;
124
125                         if (event->header.type != PERF_RECORD_COMM ||
126                             (pid_t)event->comm.pid != getpid() ||
127                             (pid_t)event->comm.tid != getpid())
128                                 goto next_event;
129
130                         if (strcmp(event->comm.comm, comm1) == 0) {
131                                 CHECK__(evsel__parse_sample(evsel, event, &sample));
132                                 comm1_time = sample.time;
133                         }
134                         if (strcmp(event->comm.comm, comm2) == 0) {
135                                 CHECK__(evsel__parse_sample(evsel, event, &sample));
136                                 comm2_time = sample.time;
137                         }
138 next_event:
139                         perf_mmap__consume(&md->core);
140                 }
141                 perf_mmap__read_done(&md->core);
142         }
143
144         if (!comm1_time || !comm2_time)
145                 goto out_err;
146
147         test_time = tsc_to_perf_time(test_tsc, &tc);
148         comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
149         comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
150
151         pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
152                  comm1_time, comm1_tsc);
153         pr_debug("rdtsc          time %"PRIu64" tsc %"PRIu64"\n",
154                  test_time, test_tsc);
155         pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
156                  comm2_time, comm2_tsc);
157
158         if (test_time <= comm1_time ||
159             test_time >= comm2_time)
160                 goto out_err;
161
162         if (test_tsc <= comm1_tsc ||
163             test_tsc >= comm2_tsc)
164                 goto out_err;
165
166         err = 0;
167
168 out_err:
169         evlist__delete(evlist);
170         return err;
171 }
172
173 bool test__tsc_is_supported(void)
174 {
175         /*
176          * Except x86_64/i386 and Arm64, other archs don't support TSC in perf.
177          * Just enable the test for x86_64/i386 and Arm64 archs.
178          */
179 #if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__)
180         return true;
181 #else
182         return false;
183 #endif
184 }