83 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <test_progs.h>3 4static void test_task_fd_query_tp_core(const char *probe_name,5 const char *tp_name)6{7 const char *file = "./test_tracepoint.bpf.o";8 int err, bytes, efd, prog_fd, pmu_fd;9 struct perf_event_attr attr = {};10 __u64 probe_offset, probe_addr;11 __u32 len, prog_id, fd_type;12 struct bpf_object *obj = NULL;13 __u32 duration = 0;14 char buf[256];15 16 err = bpf_prog_test_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);17 if (CHECK(err, "bpf_prog_test_load", "err %d errno %d\n", err, errno))18 goto close_prog;19 20 if (access("/sys/kernel/tracing/trace", F_OK) == 0) {21 snprintf(buf, sizeof(buf),22 "/sys/kernel/tracing/events/%s/id", probe_name);23 } else {24 snprintf(buf, sizeof(buf),25 "/sys/kernel/debug/tracing/events/%s/id", probe_name);26 }27 efd = open(buf, O_RDONLY, 0);28 if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))29 goto close_prog;30 bytes = read(efd, buf, sizeof(buf));31 close(efd);32 if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read",33 "bytes %d errno %d\n", bytes, errno))34 goto close_prog;35 36 attr.config = strtol(buf, NULL, 0);37 attr.type = PERF_TYPE_TRACEPOINT;38 attr.sample_type = PERF_SAMPLE_RAW;39 attr.sample_period = 1;40 attr.wakeup_events = 1;41 pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,42 0 /* cpu 0 */, -1 /* group id */,43 0 /* flags */);44 if (CHECK(err, "perf_event_open", "err %d errno %d\n", err, errno))45 goto close_pmu;46 47 err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);48 if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err,49 errno))50 goto close_pmu;51 52 err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);53 if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err,54 errno))55 goto close_pmu;56 57 /* query (getpid(), pmu_fd) */58 len = sizeof(buf);59 err = bpf_task_fd_query(getpid(), pmu_fd, 0, buf, &len, &prog_id,60 &fd_type, &probe_offset, &probe_addr);61 if (CHECK(err < 0, "bpf_task_fd_query", "err %d errno %d\n", err,62 errno))63 goto close_pmu;64 65 err = (fd_type == BPF_FD_TYPE_TRACEPOINT) && !strcmp(buf, tp_name);66 if (CHECK(!err, "check_results", "fd_type %d tp_name %s\n",67 fd_type, buf))68 goto close_pmu;69 70close_pmu:71 close(pmu_fd);72close_prog:73 bpf_object__close(obj);74}75 76void test_task_fd_query_tp(void)77{78 test_task_fd_query_tp_core("sched/sched_switch",79 "sched_switch");80 test_task_fd_query_tp_core("syscalls/sys_enter_read",81 "sys_enter_read");82}83