// SPDX-License-Identifier: GPL-2.0
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#include <test_progs.h>
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static void test_task_fd_query_tp_core(const char *probe_name,
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const char *tp_name)
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{
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const char *file = "./test_tracepoint.o";
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int err, bytes, efd, prog_fd, pmu_fd;
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struct perf_event_attr attr = {};
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__u64 probe_offset, probe_addr;
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__u32 len, prog_id, fd_type;
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struct bpf_object *obj = NULL;
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__u32 duration = 0;
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char buf[256];
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err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
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if (CHECK(err, "bpf_prog_load", "err %d errno %d\n", err, errno))
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goto close_prog;
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snprintf(buf, sizeof(buf),
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"/sys/kernel/debug/tracing/events/%s/id", probe_name);
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efd = open(buf, O_RDONLY, 0);
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if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
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goto close_prog;
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bytes = read(efd, buf, sizeof(buf));
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close(efd);
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if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read",
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"bytes %d errno %d\n", bytes, errno))
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goto close_prog;
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attr.config = strtol(buf, NULL, 0);
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attr.type = PERF_TYPE_TRACEPOINT;
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attr.sample_type = PERF_SAMPLE_RAW;
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attr.sample_period = 1;
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attr.wakeup_events = 1;
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pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
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0 /* cpu 0 */, -1 /* group id */,
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0 /* flags */);
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if (CHECK(err, "perf_event_open", "err %d errno %d\n", err, errno))
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goto close_pmu;
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err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
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if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err,
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errno))
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goto close_pmu;
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err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);
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if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err,
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errno))
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goto close_pmu;
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/* query (getpid(), pmu_fd) */
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len = sizeof(buf);
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err = bpf_task_fd_query(getpid(), pmu_fd, 0, buf, &len, &prog_id,
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&fd_type, &probe_offset, &probe_addr);
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if (CHECK(err < 0, "bpf_task_fd_query", "err %d errno %d\n", err,
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errno))
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goto close_pmu;
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err = (fd_type == BPF_FD_TYPE_TRACEPOINT) && !strcmp(buf, tp_name);
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if (CHECK(!err, "check_results", "fd_type %d tp_name %s\n",
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fd_type, buf))
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goto close_pmu;
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close_pmu:
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close(pmu_fd);
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close_prog:
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bpf_object__close(obj);
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}
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void test_task_fd_query_tp(void)
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{
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test_task_fd_query_tp_core("sched/sched_switch",
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"sched_switch");
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test_task_fd_query_tp_core("syscalls/sys_enter_read",
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"sys_enter_read");
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}
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