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
23int 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 = 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 (evsel__alloc_counts(evsel, cpus->nr, 1) < 0) {
94		pr_debug("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 (evsel__read_on_cpu(evsel, cpu, 0) < 0) {
107			pr_debug("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("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	evsel__free_counts(evsel);
121out_close_fd:
122	perf_evsel__close_fd(&evsel->core);
123out_evsel_delete:
124	evsel__delete(evsel);
125out_cpu_map_delete:
126	perf_cpu_map__put(cpus);
127out_thread_map_delete:
128	perf_thread_map__put(threads);
129	return err;
130}
131