1 // SPDX-License-Identifier: GPL-2.0
2 #include <errno.h>
3 #include <inttypes.h>
4 /* For the CPU_* macros */
5 #include <sched.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 "debug.h"
19 #include "stat.h"
20 #include "util/counts.h"
21
22 static int test__openat_syscall_event_on_all_cpus(struct test_suite *test __maybe_unused,
23 int subtest __maybe_unused)
24 {
25 int err = TEST_FAIL, fd, idx;
26 struct perf_cpu cpu;
27 struct perf_cpu_map *cpus;
28 struct evsel *evsel;
29 unsigned int nr_openat_calls = 111, i;
30 cpu_set_t cpu_set;
31 struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
32 char sbuf[STRERR_BUFSIZE];
33 char errbuf[BUFSIZ];
34
35 if (threads == NULL) {
36 pr_debug("thread_map__new\n");
37 return -1;
38 }
39
40 cpus = perf_cpu_map__new_online_cpus();
41 if (cpus == NULL) {
42 pr_debug("perf_cpu_map__new\n");
43 goto out_thread_map_delete;
44 }
45
46 CPU_ZERO(&cpu_set);
47
48 evsel = evsel__newtp("syscalls", "sys_enter_openat");
49 if (IS_ERR(evsel)) {
50 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
51 pr_debug("%s\n", errbuf);
52 err = TEST_SKIP;
53 goto out_cpu_map_delete;
54 }
55
56 if (evsel__open(evsel, cpus, threads) < 0) {
57 pr_debug("failed to open counter: %s, "
58 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
59 str_error_r(errno, sbuf, sizeof(sbuf)));
60 err = TEST_SKIP;
61 goto out_evsel_delete;
62 }
63
64 perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
65 unsigned int ncalls = nr_openat_calls + idx;
66 /*
67 * XXX eventually lift this restriction in a way that
68 * keeps perf building on older glibc installations
69 * without CPU_ALLOC. 1024 cpus in 2010 still seems
70 * a reasonable upper limit tho :-)
71 */
72 if (cpu.cpu >= CPU_SETSIZE) {
73 pr_debug("Ignoring CPU %d\n", cpu.cpu);
74 continue;
75 }
76
77 CPU_SET(cpu.cpu, &cpu_set);
78 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
79 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
80 cpu.cpu,
81 str_error_r(errno, sbuf, sizeof(sbuf)));
82 goto out_close_fd;
83 }
84 for (i = 0; i < ncalls; ++i) {
85 fd = openat(0, "/etc/passwd", O_RDONLY);
86 close(fd);
87 }
88 CPU_CLR(cpu.cpu, &cpu_set);
89 }
90
91 evsel->core.cpus = perf_cpu_map__get(cpus);
92
93 err = TEST_OK;
94
95 perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
96 unsigned int expected;
97
98 if (cpu.cpu >= CPU_SETSIZE)
99 continue;
100
101 if (evsel__read_on_cpu(evsel, idx, 0) < 0) {
102 pr_debug("evsel__read_on_cpu\n");
103 err = TEST_FAIL;
104 break;
105 }
106
107 expected = nr_openat_calls + idx;
108 if (perf_counts(evsel->counts, idx, 0)->val != expected) {
109 pr_debug("evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
110 expected, cpu.cpu, perf_counts(evsel->counts, idx, 0)->val);
111 err = TEST_FAIL;
112 }
113 }
114
115 evsel__free_counts(evsel);
116 out_close_fd:
117 perf_evsel__close_fd(&evsel->core);
118 out_evsel_delete:
119 evsel__delete(evsel);
120 out_cpu_map_delete:
121 perf_cpu_map__put(cpus);
122 out_thread_map_delete:
123 perf_thread_map__put(threads);
124 return err;
125 }
126
127
128 static struct test_case tests__openat_syscall_event_on_all_cpus[] = {
129 TEST_CASE_REASON("Detect openat syscall event on all cpus",
130 openat_syscall_event_on_all_cpus,
131 "permissions"),
132 { .name = NULL, }
133 };
134
135 struct test_suite suite__openat_syscall_event_on_all_cpus = {
136 .desc = "Detect openat syscall event on all cpus",
137 .test_cases = tests__openat_syscall_event_on_all_cpus,
138 };
139
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