1 // SPDX-License-Identifier: GPL-2.0 2 #include <test_progs.h> 3 4 void serial_test_tp_attach_query(void) 5 { 6 const int num_progs = 3; 7 int i, j, bytes, efd, err, prog_fd[num_progs], pmu_fd[num_progs]; 8 __u32 duration = 0, info_len, saved_prog_ids[num_progs]; 9 const char *file = "./test_tracepoint.bpf.o"; 10 struct perf_event_query_bpf *query; 11 struct perf_event_attr attr = {}; 12 struct bpf_object *obj[num_progs]; 13 struct bpf_prog_info prog_info; 14 char buf[256]; 15 16 for (i = 0; i < num_progs; i++) 17 obj[i] = NULL; 18 19 snprintf(buf, sizeof(buf), 20 "/sys/kernel/debug/tracing/events/sched/sched_switch/id"); 21 efd = open(buf, O_RDONLY, 0); 22 if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno)) 23 return; 24 bytes = read(efd, buf, sizeof(buf)); 25 close(efd); 26 if (CHECK(bytes <= 0 || bytes >= sizeof(buf), 27 "read", "bytes %d errno %d\n", bytes, errno)) 28 return; 29 30 attr.config = strtol(buf, NULL, 0); 31 attr.type = PERF_TYPE_TRACEPOINT; 32 attr.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_CALLCHAIN; 33 attr.sample_period = 1; 34 attr.wakeup_events = 1; 35 36 query = malloc(sizeof(*query) + sizeof(__u32) * num_progs); 37 for (i = 0; i < num_progs; i++) { 38 err = bpf_prog_test_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj[i], 39 &prog_fd[i]); 40 if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno)) 41 goto cleanup1; 42 43 bzero(&prog_info, sizeof(prog_info)); 44 prog_info.jited_prog_len = 0; 45 prog_info.xlated_prog_len = 0; 46 prog_info.nr_map_ids = 0; 47 info_len = sizeof(prog_info); 48 err = bpf_prog_get_info_by_fd(prog_fd[i], &prog_info, 49 &info_len); 50 if (CHECK(err, "bpf_prog_get_info_by_fd", "err %d errno %d\n", 51 err, errno)) 52 goto cleanup1; 53 saved_prog_ids[i] = prog_info.id; 54 55 pmu_fd[i] = syscall(__NR_perf_event_open, &attr, -1 /* pid */, 56 0 /* cpu 0 */, -1 /* group id */, 57 0 /* flags */); 58 if (CHECK(pmu_fd[i] < 0, "perf_event_open", "err %d errno %d\n", 59 pmu_fd[i], errno)) 60 goto cleanup2; 61 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE, 0); 62 if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", 63 err, errno)) 64 goto cleanup3; 65 66 if (i == 0) { 67 /* check NULL prog array query */ 68 query->ids_len = num_progs; 69 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); 70 if (CHECK(err || query->prog_cnt != 0, 71 "perf_event_ioc_query_bpf", 72 "err %d errno %d query->prog_cnt %u\n", 73 err, errno, query->prog_cnt)) 74 goto cleanup3; 75 } 76 77 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[i]); 78 if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", 79 err, errno)) 80 goto cleanup3; 81 82 if (i == 1) { 83 /* try to get # of programs only */ 84 query->ids_len = 0; 85 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); 86 if (CHECK(err || query->prog_cnt != 2, 87 "perf_event_ioc_query_bpf", 88 "err %d errno %d query->prog_cnt %u\n", 89 err, errno, query->prog_cnt)) 90 goto cleanup3; 91 92 /* try a few negative tests */ 93 /* invalid query pointer */ 94 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, 95 (struct perf_event_query_bpf *)0x1); 96 if (CHECK(!err || errno != EFAULT, 97 "perf_event_ioc_query_bpf", 98 "err %d errno %d\n", err, errno)) 99 goto cleanup3; 100 101 /* no enough space */ 102 query->ids_len = 1; 103 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); 104 if (CHECK(!err || errno != ENOSPC || query->prog_cnt != 2, 105 "perf_event_ioc_query_bpf", 106 "err %d errno %d query->prog_cnt %u\n", 107 err, errno, query->prog_cnt)) 108 goto cleanup3; 109 } 110 111 query->ids_len = num_progs; 112 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); 113 if (CHECK(err || query->prog_cnt != (i + 1), 114 "perf_event_ioc_query_bpf", 115 "err %d errno %d query->prog_cnt %u\n", 116 err, errno, query->prog_cnt)) 117 goto cleanup3; 118 for (j = 0; j < i + 1; j++) 119 if (CHECK(saved_prog_ids[j] != query->ids[j], 120 "perf_event_ioc_query_bpf", 121 "#%d saved_prog_id %x query prog_id %x\n", 122 j, saved_prog_ids[j], query->ids[j])) 123 goto cleanup3; 124 } 125 126 i = num_progs - 1; 127 for (; i >= 0; i--) { 128 cleanup3: 129 ioctl(pmu_fd[i], PERF_EVENT_IOC_DISABLE); 130 cleanup2: 131 close(pmu_fd[i]); 132 cleanup1: 133 bpf_object__close(obj[i]); 134 } 135 free(query); 136 } 137