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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a43783ae | 2 | #include <errno.h> |
fd20e811 | 3 | #include <inttypes.h> |
1fbe7df8 ACM |
4 | /* For the CLR_() macros */ |
5 | #include <pthread.h> | |
6 | ||
a65b9c62 JO |
7 | #include "evlist.h" |
8 | #include "evsel.h" | |
9 | #include "thread_map.h" | |
10 | #include "cpumap.h" | |
11 | #include "tests.h" | |
8dd2a131 | 12 | #include <linux/err.h> |
877a7a11 | 13 | #include <linux/kernel.h> |
a65b9c62 JO |
14 | |
15 | /* | |
16 | * This test will generate random numbers of calls to some getpid syscalls, | |
17 | * then establish an mmap for a group of events that are created to monitor | |
18 | * the syscalls. | |
19 | * | |
20 | * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated | |
21 | * sample.id field to map back to its respective perf_evsel instance. | |
22 | * | |
23 | * Then it checks if the number of syscalls reported as perf events by | |
24 | * the kernel corresponds to the number of syscalls made. | |
25 | */ | |
81f17c90 | 26 | int test__basic_mmap(struct test *test __maybe_unused, int subtest __maybe_unused) |
a65b9c62 JO |
27 | { |
28 | int err = -1; | |
29 | union perf_event *event; | |
30 | struct thread_map *threads; | |
31 | struct cpu_map *cpus; | |
32 | struct perf_evlist *evlist; | |
a65b9c62 | 33 | cpu_set_t cpu_set; |
cec83938 RV |
34 | const char *syscall_names[] = { "getsid", "getppid", "getpgid", }; |
35 | pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid }; | |
a65b9c62 | 36 | #define nsyscalls ARRAY_SIZE(syscall_names) |
a65b9c62 JO |
37 | unsigned int nr_events[nsyscalls], |
38 | expected_nr_events[nsyscalls], i, j; | |
39 | struct perf_evsel *evsels[nsyscalls], *evsel; | |
ba3dfff8 | 40 | char sbuf[STRERR_BUFSIZE]; |
a65b9c62 | 41 | |
a65b9c62 JO |
42 | threads = thread_map__new(-1, getpid(), UINT_MAX); |
43 | if (threads == NULL) { | |
44 | pr_debug("thread_map__new\n"); | |
45 | return -1; | |
46 | } | |
47 | ||
48 | cpus = cpu_map__new(NULL); | |
49 | if (cpus == NULL) { | |
50 | pr_debug("cpu_map__new\n"); | |
51 | goto out_free_threads; | |
52 | } | |
53 | ||
54 | CPU_ZERO(&cpu_set); | |
55 | CPU_SET(cpus->map[0], &cpu_set); | |
56 | sched_setaffinity(0, sizeof(cpu_set), &cpu_set); | |
57 | if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { | |
58 | pr_debug("sched_setaffinity() failed on CPU %d: %s ", | |
c8b5f2c9 | 59 | cpus->map[0], str_error_r(errno, sbuf, sizeof(sbuf))); |
a65b9c62 JO |
60 | goto out_free_cpus; |
61 | } | |
62 | ||
334fe7a3 | 63 | evlist = perf_evlist__new(); |
a65b9c62 JO |
64 | if (evlist == NULL) { |
65 | pr_debug("perf_evlist__new\n"); | |
66 | goto out_free_cpus; | |
67 | } | |
68 | ||
334fe7a3 NK |
69 | perf_evlist__set_maps(evlist, cpus, threads); |
70 | ||
a65b9c62 | 71 | for (i = 0; i < nsyscalls; ++i) { |
a60d7953 ACM |
72 | char name[64]; |
73 | ||
74 | snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]); | |
ef503831 | 75 | evsels[i] = perf_evsel__newtp("syscalls", name); |
8dd2a131 | 76 | if (IS_ERR(evsels[i])) { |
a65b9c62 | 77 | pr_debug("perf_evsel__new\n"); |
f26e1c7c | 78 | goto out_delete_evlist; |
a65b9c62 JO |
79 | } |
80 | ||
a60d7953 | 81 | evsels[i]->attr.wakeup_events = 1; |
75562573 | 82 | perf_evsel__set_sample_id(evsels[i], false); |
a60d7953 | 83 | |
a65b9c62 JO |
84 | perf_evlist__add(evlist, evsels[i]); |
85 | ||
86 | if (perf_evsel__open(evsels[i], cpus, threads) < 0) { | |
87 | pr_debug("failed to open counter: %s, " | |
88 | "tweak /proc/sys/kernel/perf_event_paranoid?\n", | |
c8b5f2c9 | 89 | str_error_r(errno, sbuf, sizeof(sbuf))); |
f26e1c7c | 90 | goto out_delete_evlist; |
a65b9c62 | 91 | } |
a60d7953 ACM |
92 | |
93 | nr_events[i] = 0; | |
94 | expected_nr_events[i] = 1 + rand() % 127; | |
a65b9c62 JO |
95 | } |
96 | ||
97 | if (perf_evlist__mmap(evlist, 128, true) < 0) { | |
98 | pr_debug("failed to mmap events: %d (%s)\n", errno, | |
c8b5f2c9 | 99 | str_error_r(errno, sbuf, sizeof(sbuf))); |
f26e1c7c | 100 | goto out_delete_evlist; |
a65b9c62 JO |
101 | } |
102 | ||
103 | for (i = 0; i < nsyscalls; ++i) | |
104 | for (j = 0; j < expected_nr_events[i]; ++j) { | |
105 | int foo = syscalls[i](); | |
106 | ++foo; | |
107 | } | |
108 | ||
109 | while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { | |
110 | struct perf_sample sample; | |
111 | ||
112 | if (event->header.type != PERF_RECORD_SAMPLE) { | |
113 | pr_debug("unexpected %s event\n", | |
114 | perf_event__name(event->header.type)); | |
983874d1 | 115 | goto out_delete_evlist; |
a65b9c62 JO |
116 | } |
117 | ||
118 | err = perf_evlist__parse_sample(evlist, event, &sample); | |
119 | if (err) { | |
120 | pr_err("Can't parse sample, err = %d\n", err); | |
983874d1 | 121 | goto out_delete_evlist; |
a65b9c62 JO |
122 | } |
123 | ||
c5d3d50d | 124 | err = -1; |
a65b9c62 JO |
125 | evsel = perf_evlist__id2evsel(evlist, sample.id); |
126 | if (evsel == NULL) { | |
127 | pr_debug("event with id %" PRIu64 | |
128 | " doesn't map to an evsel\n", sample.id); | |
983874d1 | 129 | goto out_delete_evlist; |
a65b9c62 JO |
130 | } |
131 | nr_events[evsel->idx]++; | |
8e50d384 | 132 | perf_evlist__mmap_consume(evlist, 0); |
a65b9c62 JO |
133 | } |
134 | ||
c5d3d50d | 135 | err = 0; |
e5cadb93 | 136 | evlist__for_each_entry(evlist, evsel) { |
a65b9c62 JO |
137 | if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) { |
138 | pr_debug("expected %d %s events, got %d\n", | |
139 | expected_nr_events[evsel->idx], | |
140 | perf_evsel__name(evsel), nr_events[evsel->idx]); | |
c5d3d50d | 141 | err = -1; |
983874d1 | 142 | goto out_delete_evlist; |
a65b9c62 JO |
143 | } |
144 | } | |
145 | ||
f26e1c7c | 146 | out_delete_evlist: |
a65b9c62 | 147 | perf_evlist__delete(evlist); |
03ad9747 ACM |
148 | cpus = NULL; |
149 | threads = NULL; | |
a65b9c62 | 150 | out_free_cpus: |
f30a79b0 | 151 | cpu_map__put(cpus); |
a65b9c62 | 152 | out_free_threads: |
186fbb74 | 153 | thread_map__put(threads); |
a65b9c62 JO |
154 | return err; |
155 | } |