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