tp_attach_query.c (4164B)
1// SPDX-License-Identifier: GPL-2.0 2#include <test_progs.h> 3 4void 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.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_obj_get_info_by_fd(prog_fd[i], &prog_info, &info_len); 49 if (CHECK(err, "bpf_obj_get_info_by_fd", "err %d errno %d\n", 50 err, errno)) 51 goto cleanup1; 52 saved_prog_ids[i] = prog_info.id; 53 54 pmu_fd[i] = syscall(__NR_perf_event_open, &attr, -1 /* pid */, 55 0 /* cpu 0 */, -1 /* group id */, 56 0 /* flags */); 57 if (CHECK(pmu_fd[i] < 0, "perf_event_open", "err %d errno %d\n", 58 pmu_fd[i], errno)) 59 goto cleanup2; 60 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE, 0); 61 if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", 62 err, errno)) 63 goto cleanup3; 64 65 if (i == 0) { 66 /* check NULL prog array query */ 67 query->ids_len = num_progs; 68 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); 69 if (CHECK(err || query->prog_cnt != 0, 70 "perf_event_ioc_query_bpf", 71 "err %d errno %d query->prog_cnt %u\n", 72 err, errno, query->prog_cnt)) 73 goto cleanup3; 74 } 75 76 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[i]); 77 if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", 78 err, errno)) 79 goto cleanup3; 80 81 if (i == 1) { 82 /* try to get # of programs only */ 83 query->ids_len = 0; 84 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); 85 if (CHECK(err || query->prog_cnt != 2, 86 "perf_event_ioc_query_bpf", 87 "err %d errno %d query->prog_cnt %u\n", 88 err, errno, query->prog_cnt)) 89 goto cleanup3; 90 91 /* try a few negative tests */ 92 /* invalid query pointer */ 93 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, 94 (struct perf_event_query_bpf *)0x1); 95 if (CHECK(!err || errno != EFAULT, 96 "perf_event_ioc_query_bpf", 97 "err %d errno %d\n", err, errno)) 98 goto cleanup3; 99 100 /* no enough space */ 101 query->ids_len = 1; 102 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); 103 if (CHECK(!err || errno != ENOSPC || query->prog_cnt != 2, 104 "perf_event_ioc_query_bpf", 105 "err %d errno %d query->prog_cnt %u\n", 106 err, errno, query->prog_cnt)) 107 goto cleanup3; 108 } 109 110 query->ids_len = num_progs; 111 err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); 112 if (CHECK(err || query->prog_cnt != (i + 1), 113 "perf_event_ioc_query_bpf", 114 "err %d errno %d query->prog_cnt %u\n", 115 err, errno, query->prog_cnt)) 116 goto cleanup3; 117 for (j = 0; j < i + 1; j++) 118 if (CHECK(saved_prog_ids[j] != query->ids[j], 119 "perf_event_ioc_query_bpf", 120 "#%d saved_prog_id %x query prog_id %x\n", 121 j, saved_prog_ids[j], query->ids[j])) 122 goto cleanup3; 123 } 124 125 i = num_progs - 1; 126 for (; i >= 0; i--) { 127 cleanup3: 128 ioctl(pmu_fd[i], PERF_EVENT_IOC_DISABLE); 129 cleanup2: 130 close(pmu_fd[i]); 131 cleanup1: 132 bpf_object__close(obj[i]); 133 } 134 free(query); 135}