diff options
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/perf_buffer.c')
-rw-r--r-- | tools/testing/selftests/bpf/prog_tests/perf_buffer.c | 118 |
1 files changed, 76 insertions, 42 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/perf_buffer.c b/tools/testing/selftests/bpf/prog_tests/perf_buffer.c index 1450ea2dd4cc..5fc2b3a0711e 100644 --- a/tools/testing/selftests/bpf/prog_tests/perf_buffer.c +++ b/tools/testing/selftests/bpf/prog_tests/perf_buffer.c @@ -4,8 +4,16 @@ #include <sched.h> #include <sys/socket.h> #include <test_progs.h> +#include "test_perf_buffer.skel.h" #include "bpf/libbpf_internal.h" +static int duration; + +/* AddressSanitizer sometimes crashes due to data dereference below, due to + * this being mmap()'ed memory. Disable instrumentation with + * no_sanitize_address attribute + */ +__attribute__((no_sanitize_address)) static void on_sample(void *ctx, int cpu, void *data, __u32 size) { int cpu_data = *(int *)data, duration = 0; @@ -18,18 +26,31 @@ static void on_sample(void *ctx, int cpu, void *data, __u32 size) CPU_SET(cpu, cpu_seen); } -void test_perf_buffer(void) +int trigger_on_cpu(int cpu) +{ + cpu_set_t cpu_set; + int err; + + CPU_ZERO(&cpu_set); + CPU_SET(cpu, &cpu_set); + + err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), &cpu_set); + if (err && CHECK(err, "set_affinity", "cpu #%d, err %d\n", cpu, err)) + return err; + + usleep(1); + + return 0; +} + +void serial_test_perf_buffer(void) { - int err, prog_fd, on_len, nr_on_cpus = 0, nr_cpus, i, duration = 0; - const char *prog_name = "kprobe/sys_nanosleep"; - const char *file = "./test_perf_buffer.o"; - struct perf_buffer_opts pb_opts = {}; - struct bpf_map *perf_buf_map; - cpu_set_t cpu_set, cpu_seen; - struct bpf_program *prog; - struct bpf_object *obj; + int err, on_len, nr_on_cpus = 0, nr_cpus, i, j; + int zero = 0, my_pid = getpid(); + struct test_perf_buffer *skel; + cpu_set_t cpu_seen; struct perf_buffer *pb; - struct bpf_link *link; + int last_fd = -1, fd; bool *online; nr_cpus = libbpf_num_possible_cpus(); @@ -46,33 +67,27 @@ void test_perf_buffer(void) nr_on_cpus++; /* load program */ - err = bpf_prog_load(file, BPF_PROG_TYPE_KPROBE, &obj, &prog_fd); - if (CHECK(err, "obj_load", "err %d errno %d\n", err, errno)) { - obj = NULL; + skel = test_perf_buffer__open_and_load(); + if (CHECK(!skel, "skel_load", "skeleton open/load failed\n")) goto out_close; - } - prog = bpf_object__find_program_by_title(obj, prog_name); - if (CHECK(!prog, "find_probe", "prog '%s' not found\n", prog_name)) + err = bpf_map_update_elem(bpf_map__fd(skel->maps.my_pid_map), &zero, &my_pid, 0); + if (!ASSERT_OK(err, "my_pid_update")) goto out_close; - /* load map */ - perf_buf_map = bpf_object__find_map_by_name(obj, "perf_buf_map"); - if (CHECK(!perf_buf_map, "find_perf_buf_map", "not found\n")) + /* attach probe */ + err = test_perf_buffer__attach(skel); + if (CHECK(err, "attach_kprobe", "err %d\n", err)) goto out_close; - /* attach kprobe */ - link = bpf_program__attach_kprobe(prog, false /* retprobe */, - SYS_NANOSLEEP_KPROBE_NAME); - if (CHECK(IS_ERR(link), "attach_kprobe", "err %ld\n", PTR_ERR(link))) + /* set up perf buffer */ + pb = perf_buffer__new(bpf_map__fd(skel->maps.perf_buf_map), 1, + on_sample, NULL, &cpu_seen, NULL); + if (!ASSERT_OK_PTR(pb, "perf_buf__new")) goto out_close; - /* set up perf buffer */ - pb_opts.sample_cb = on_sample; - pb_opts.ctx = &cpu_seen; - pb = perf_buffer__new(bpf_map__fd(perf_buf_map), 1, &pb_opts); - if (CHECK(IS_ERR(pb), "perf_buf__new", "err %ld\n", PTR_ERR(pb))) - goto out_detach; + CHECK(perf_buffer__epoll_fd(pb) < 0, "epoll_fd", + "bad fd: %d\n", perf_buffer__epoll_fd(pb)); /* trigger kprobe on every CPU */ CPU_ZERO(&cpu_seen); @@ -82,16 +97,8 @@ void test_perf_buffer(void) continue; } - CPU_ZERO(&cpu_set); - CPU_SET(i, &cpu_set); - - err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), - &cpu_set); - if (err && CHECK(err, "set_affinity", "cpu #%d, err %d\n", - i, err)) - goto out_detach; - - usleep(1); + if (trigger_on_cpu(i)) + goto out_close; } /* read perf buffer */ @@ -103,11 +110,38 @@ void test_perf_buffer(void) "expect %d, seen %d\n", nr_on_cpus, CPU_COUNT(&cpu_seen))) goto out_free_pb; + if (CHECK(perf_buffer__buffer_cnt(pb) != nr_on_cpus, "buf_cnt", + "got %zu, expected %d\n", perf_buffer__buffer_cnt(pb), nr_on_cpus)) + goto out_close; + + for (i = 0, j = 0; i < nr_cpus; i++) { + if (i >= on_len || !online[i]) + continue; + + fd = perf_buffer__buffer_fd(pb, j); + CHECK(fd < 0 || last_fd == fd, "fd_check", "last fd %d == fd %d\n", last_fd, fd); + last_fd = fd; + + err = perf_buffer__consume_buffer(pb, j); + if (CHECK(err, "drain_buf", "cpu %d, err %d\n", i, err)) + goto out_close; + + CPU_CLR(i, &cpu_seen); + if (trigger_on_cpu(i)) + goto out_close; + + err = perf_buffer__consume_buffer(pb, j); + if (CHECK(err, "consume_buf", "cpu %d, err %d\n", j, err)) + goto out_close; + + if (CHECK(!CPU_ISSET(i, &cpu_seen), "cpu_seen", "cpu %d not seen\n", i)) + goto out_close; + j++; + } + out_free_pb: perf_buffer__free(pb); -out_detach: - bpf_link__destroy(link); out_close: - bpf_object__close(obj); + test_perf_buffer__destroy(skel); free(online); } |