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 20 int 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); 118 out_close_fd: 119 perf_evsel__close_fd(evsel); 120 out_evsel_delete: 121 perf_evsel__delete(evsel); 122 out_thread_map_delete: 123 thread_map__put(threads); 124 return err; 125 } 126