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