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 }; 139