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 #include "util/counts.h" 20 21 int test__openat_syscall_event_on_all_cpus(struct test *test __maybe_unused, int subtest __maybe_unused) 22 { 23 int err = -1, fd, cpu; 24 struct perf_cpu_map *cpus; 25 struct evsel *evsel; 26 unsigned int nr_openat_calls = 111, i; 27 cpu_set_t cpu_set; 28 struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX); 29 char sbuf[STRERR_BUFSIZE]; 30 char errbuf[BUFSIZ]; 31 32 if (threads == NULL) { 33 pr_debug("thread_map__new\n"); 34 return -1; 35 } 36 37 cpus = perf_cpu_map__new(NULL); 38 if (cpus == NULL) { 39 pr_debug("cpu_map__new\n"); 40 goto out_thread_map_delete; 41 } 42 43 CPU_ZERO(&cpu_set); 44 45 evsel = perf_evsel__newtp("syscalls", "sys_enter_openat"); 46 if (IS_ERR(evsel)) { 47 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat"); 48 pr_debug("%s\n", errbuf); 49 goto out_cpu_map_delete; 50 } 51 52 if (evsel__open(evsel, cpus, threads) < 0) { 53 pr_debug("failed to open counter: %s, " 54 "tweak /proc/sys/kernel/perf_event_paranoid?\n", 55 str_error_r(errno, sbuf, sizeof(sbuf))); 56 goto out_evsel_delete; 57 } 58 59 for (cpu = 0; cpu < cpus->nr; ++cpu) { 60 unsigned int ncalls = nr_openat_calls + cpu; 61 /* 62 * XXX eventually lift this restriction in a way that 63 * keeps perf building on older glibc installations 64 * without CPU_ALLOC. 1024 cpus in 2010 still seems 65 * a reasonable upper limit tho :-) 66 */ 67 if (cpus->map[cpu] >= CPU_SETSIZE) { 68 pr_debug("Ignoring CPU %d\n", cpus->map[cpu]); 69 continue; 70 } 71 72 CPU_SET(cpus->map[cpu], &cpu_set); 73 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { 74 pr_debug("sched_setaffinity() failed on CPU %d: %s ", 75 cpus->map[cpu], 76 str_error_r(errno, sbuf, sizeof(sbuf))); 77 goto out_close_fd; 78 } 79 for (i = 0; i < ncalls; ++i) { 80 fd = openat(0, "/etc/passwd", O_RDONLY); 81 close(fd); 82 } 83 CPU_CLR(cpus->map[cpu], &cpu_set); 84 } 85 86 /* 87 * Here we need to explicitly preallocate the counts, as if 88 * we use the auto allocation it will allocate just for 1 cpu, 89 * as we start by cpu 0. 90 */ 91 if (perf_evsel__alloc_counts(evsel, cpus->nr, 1) < 0) { 92 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr); 93 goto out_close_fd; 94 } 95 96 err = 0; 97 98 for (cpu = 0; cpu < cpus->nr; ++cpu) { 99 unsigned int expected; 100 101 if (cpus->map[cpu] >= CPU_SETSIZE) 102 continue; 103 104 if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) { 105 pr_debug("perf_evsel__read_on_cpu\n"); 106 err = -1; 107 break; 108 } 109 110 expected = nr_openat_calls + cpu; 111 if (perf_counts(evsel->counts, cpu, 0)->val != expected) { 112 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n", 113 expected, cpus->map[cpu], perf_counts(evsel->counts, cpu, 0)->val); 114 err = -1; 115 } 116 } 117 118 perf_evsel__free_counts(evsel); 119 out_close_fd: 120 perf_evsel__close_fd(&evsel->core); 121 out_evsel_delete: 122 evsel__delete(evsel); 123 out_cpu_map_delete: 124 perf_cpu_map__put(cpus); 125 out_thread_map_delete: 126 perf_thread_map__put(threads); 127 return err; 128 } 129