1 // SPDX-License-Identifier: GPL-2.0
2 #include <errno.h>
3 #include <inttypes.h>
4 /* For the CPU_* macros */
5 #include <pthread.h>
6
7 #include <sys/types.h>
8 #include <sys/stat.h>
9 #include <fcntl.h>
10 #include <api/fs/fs.h>
11 #include <linux/err.h>
12 #include <linux/string.h>
13 #include <api/fs/tracing_path.h>
14 #include "evsel.h"
15 #include "tests.h"
16 #include "thread_map.h"
17 #include <perf/cpumap.h>
18 #include <internal/cpumap.h>
19 #include "debug.h"
20 #include "stat.h"
21 #include "util/counts.h"
22
test__openat_syscall_event_on_all_cpus(struct test * test __maybe_unused,int subtest __maybe_unused)23 int test__openat_syscall_event_on_all_cpus(struct test *test __maybe_unused, int subtest __maybe_unused)
24 {
25 int err = -1, fd, cpu;
26 struct perf_cpu_map *cpus;
27 struct evsel *evsel;
28 unsigned int nr_openat_calls = 111, i;
29 cpu_set_t cpu_set;
30 struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
31 char sbuf[STRERR_BUFSIZE];
32 char errbuf[BUFSIZ];
33
34 if (threads == NULL) {
35 pr_debug("thread_map__new\n");
36 return -1;
37 }
38
39 cpus = perf_cpu_map__new(NULL);
40 if (cpus == NULL) {
41 pr_debug("perf_cpu_map__new\n");
42 goto out_thread_map_delete;
43 }
44
45 CPU_ZERO(&cpu_set);
46
47 evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
48 if (IS_ERR(evsel)) {
49 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
50 pr_debug("%s\n", errbuf);
51 goto out_cpu_map_delete;
52 }
53
54 if (evsel__open(evsel, cpus, threads) < 0) {
55 pr_debug("failed to open counter: %s, "
56 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
57 str_error_r(errno, sbuf, sizeof(sbuf)));
58 goto out_evsel_delete;
59 }
60
61 for (cpu = 0; cpu < cpus->nr; ++cpu) {
62 unsigned int ncalls = nr_openat_calls + cpu;
63 /*
64 * XXX eventually lift this restriction in a way that
65 * keeps perf building on older glibc installations
66 * without CPU_ALLOC. 1024 cpus in 2010 still seems
67 * a reasonable upper limit tho :-)
68 */
69 if (cpus->map[cpu] >= CPU_SETSIZE) {
70 pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
71 continue;
72 }
73
74 CPU_SET(cpus->map[cpu], &cpu_set);
75 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
76 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
77 cpus->map[cpu],
78 str_error_r(errno, sbuf, sizeof(sbuf)));
79 goto out_close_fd;
80 }
81 for (i = 0; i < ncalls; ++i) {
82 fd = openat(0, "/etc/passwd", O_RDONLY);
83 close(fd);
84 }
85 CPU_CLR(cpus->map[cpu], &cpu_set);
86 }
87
88 /*
89 * Here we need to explicitly preallocate the counts, as if
90 * we use the auto allocation it will allocate just for 1 cpu,
91 * as we start by cpu 0.
92 */
93 if (perf_evsel__alloc_counts(evsel, cpus->nr, 1) < 0) {
94 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
95 goto out_close_fd;
96 }
97
98 err = 0;
99
100 for (cpu = 0; cpu < cpus->nr; ++cpu) {
101 unsigned int expected;
102
103 if (cpus->map[cpu] >= CPU_SETSIZE)
104 continue;
105
106 if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
107 pr_debug("perf_evsel__read_on_cpu\n");
108 err = -1;
109 break;
110 }
111
112 expected = nr_openat_calls + cpu;
113 if (perf_counts(evsel->counts, cpu, 0)->val != expected) {
114 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
115 expected, cpus->map[cpu], perf_counts(evsel->counts, cpu, 0)->val);
116 err = -1;
117 }
118 }
119
120 perf_evsel__free_counts(evsel);
121 out_close_fd:
122 perf_evsel__close_fd(&evsel->core);
123 out_evsel_delete:
124 evsel__delete(evsel);
125 out_cpu_map_delete:
126 perf_cpu_map__put(cpus);
127 out_thread_map_delete:
128 perf_thread_map__put(threads);
129 return err;
130 }
131
