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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a43783ae | 2 | #include <errno.h> |
fd20e811 | 3 | #include <inttypes.h> |
bc96b361 NK |
4 | #include <unistd.h> |
5 | #include <stdlib.h> | |
6 | #include <signal.h> | |
7 | #include <sys/mman.h> | |
8 | ||
9 | #include "tests.h" | |
10 | #include "util/evsel.h" | |
11 | #include "util/evlist.h" | |
12 | #include "util/cpumap.h" | |
13 | #include "util/thread_map.h" | |
14 | ||
3fe21305 | 15 | #define NR_LOOPS 10000000 |
bc96b361 NK |
16 | |
17 | /* | |
18 | * This test will open software clock events (cpu-clock, task-clock) | |
19 | * then check their frequency -> period conversion has no artifact of | |
20 | * setting period to 1 forcefully. | |
21 | */ | |
22 | static int __test__sw_clock_freq(enum perf_sw_ids clock_id) | |
23 | { | |
24 | int i, err = -1; | |
25 | volatile int tmp = 0; | |
26 | u64 total_periods = 0; | |
27 | int nr_samples = 0; | |
ba3dfff8 | 28 | char sbuf[STRERR_BUFSIZE]; |
bc96b361 | 29 | union perf_event *event; |
32dcd021 | 30 | struct evsel *evsel; |
63503dba | 31 | struct evlist *evlist; |
bc96b361 NK |
32 | struct perf_event_attr attr = { |
33 | .type = PERF_TYPE_SOFTWARE, | |
34 | .config = clock_id, | |
35 | .sample_type = PERF_SAMPLE_PERIOD, | |
36 | .exclude_kernel = 1, | |
37 | .disabled = 1, | |
38 | .freq = 1, | |
39 | }; | |
f854839b | 40 | struct perf_cpu_map *cpus; |
9749b90e | 41 | struct perf_thread_map *threads; |
5d0007cd | 42 | struct perf_mmap *md; |
bc96b361 | 43 | |
67c1e4a5 | 44 | attr.sample_freq = 500; |
bc96b361 NK |
45 | |
46 | evlist = perf_evlist__new(); | |
47 | if (evlist == NULL) { | |
48 | pr_debug("perf_evlist__new\n"); | |
49 | return -1; | |
50 | } | |
51 | ||
ef503831 | 52 | evsel = perf_evsel__new(&attr); |
bc96b361 NK |
53 | if (evsel == NULL) { |
54 | pr_debug("perf_evsel__new\n"); | |
03ad9747 | 55 | goto out_delete_evlist; |
bc96b361 NK |
56 | } |
57 | perf_evlist__add(evlist, evsel); | |
58 | ||
c5e6bd2e AH |
59 | cpus = cpu_map__dummy_new(); |
60 | threads = thread_map__new_by_tid(getpid()); | |
61 | if (!cpus || !threads) { | |
bc96b361 NK |
62 | err = -ENOMEM; |
63 | pr_debug("Not enough memory to create thread/cpu maps\n"); | |
c5e6bd2e | 64 | goto out_free_maps; |
bc96b361 NK |
65 | } |
66 | ||
c5e6bd2e AH |
67 | perf_evlist__set_maps(evlist, cpus, threads); |
68 | ||
69 | cpus = NULL; | |
70 | threads = NULL; | |
71 | ||
d0b849e9 | 72 | if (perf_evlist__open(evlist)) { |
67c1e4a5 ACM |
73 | const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; |
74 | ||
d0b849e9 | 75 | err = -errno; |
67c1e4a5 | 76 | pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", |
c8b5f2c9 | 77 | str_error_r(errno, sbuf, sizeof(sbuf)), |
ba3dfff8 | 78 | knob, (u64)attr.sample_freq); |
03ad9747 | 79 | goto out_delete_evlist; |
d0b849e9 | 80 | } |
bc96b361 | 81 | |
f74b9d3a | 82 | err = perf_evlist__mmap(evlist, 128); |
bc96b361 NK |
83 | if (err < 0) { |
84 | pr_debug("failed to mmap event: %d (%s)\n", errno, | |
c8b5f2c9 | 85 | str_error_r(errno, sbuf, sizeof(sbuf))); |
f26e1c7c | 86 | goto out_delete_evlist; |
bc96b361 NK |
87 | } |
88 | ||
89 | perf_evlist__enable(evlist); | |
90 | ||
91 | /* collect samples */ | |
92 | for (i = 0; i < NR_LOOPS; i++) | |
93 | tmp++; | |
94 | ||
95 | perf_evlist__disable(evlist); | |
96 | ||
5d0007cd | 97 | md = &evlist->mmap[0]; |
b9bae2c8 | 98 | if (perf_mmap__read_init(md) < 0) |
5d0007cd KL |
99 | goto out_init; |
100 | ||
0019dc87 | 101 | while ((event = perf_mmap__read_event(md)) != NULL) { |
bc96b361 NK |
102 | struct perf_sample sample; |
103 | ||
104 | if (event->header.type != PERF_RECORD_SAMPLE) | |
8e50d384 | 105 | goto next_event; |
bc96b361 NK |
106 | |
107 | err = perf_evlist__parse_sample(evlist, event, &sample); | |
108 | if (err < 0) { | |
109 | pr_debug("Error during parse sample\n"); | |
983874d1 | 110 | goto out_delete_evlist; |
bc96b361 NK |
111 | } |
112 | ||
113 | total_periods += sample.period; | |
114 | nr_samples++; | |
8e50d384 | 115 | next_event: |
d6ace3df | 116 | perf_mmap__consume(md); |
bc96b361 | 117 | } |
5d0007cd | 118 | perf_mmap__read_done(md); |
bc96b361 | 119 | |
5d0007cd | 120 | out_init: |
bc96b361 NK |
121 | if ((u64) nr_samples == total_periods) { |
122 | pr_debug("All (%d) samples have period value of 1!\n", | |
123 | nr_samples); | |
124 | err = -1; | |
125 | } | |
126 | ||
c5e6bd2e AH |
127 | out_free_maps: |
128 | cpu_map__put(cpus); | |
129 | thread_map__put(threads); | |
03ad9747 | 130 | out_delete_evlist: |
bc96b361 NK |
131 | perf_evlist__delete(evlist); |
132 | return err; | |
133 | } | |
134 | ||
81f17c90 | 135 | int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused) |
bc96b361 NK |
136 | { |
137 | int ret; | |
138 | ||
139 | ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); | |
140 | if (!ret) | |
141 | ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); | |
142 | ||
143 | return ret; | |
144 | } |