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-rw-r--r--tools/testing/selftests/bpf/prog_tests/perf_buffer.c118
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);
}