tools/perf/tests/openat-syscall-all-cpus.c

   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(NULL);
  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 };