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