Commit 42187bdc authored by sunliming's avatar sunliming Committed by Steven Rostedt (Google)
Browse files

selftests/user_events: Add perf self-test for empty arguments events 

Tests to ensure events that has empty arguments can input trace record
correctly when using perf.

Link: https://lkml.kernel.org/r/20230606062027.1008398-5-sunliming@kylinos.cn



Acked-by: default avatarBeau Belgrave <beaub@linux.microsoft.com>
Acked-by: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: default avatarsunliming <sunliming@kylinos.cn>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent 4b56c21b

tools/testing/selftests/user_events/perf_test.c

+53 −0
Original line number Diff line number Diff line
@@ -189,6 +189,59 @@ TEST_F(user, perf_write) { 
	ASSERT_EQ(0, self->check);

}



TEST_F(user, perf_empty_events) {

	struct perf_event_attr pe = {0};

	struct user_reg reg = {0};

	struct perf_event_mmap_page *perf_page;

	int page_size = sysconf(_SC_PAGESIZE);

	int id, fd;

	__u32 *val;



	reg.size = sizeof(reg);

	reg.name_args = (__u64)"__test_event";

	reg.enable_bit = 31;

	reg.enable_addr = (__u64)&self->check;

	reg.enable_size = sizeof(self->check);



	/* Register should work */

	ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));

	ASSERT_EQ(0, reg.write_index);

	ASSERT_EQ(0, self->check);



	/* Id should be there */

	id = get_id();

	ASSERT_NE(-1, id);



	pe.type = PERF_TYPE_TRACEPOINT;

	pe.size = sizeof(pe);

	pe.config = id;

	pe.sample_type = PERF_SAMPLE_RAW;

	pe.sample_period = 1;

	pe.wakeup_events = 1;



	/* Tracepoint attach should work */

	fd = perf_event_open(&pe, 0, -1, -1, 0);

	ASSERT_NE(-1, fd);



	perf_page = mmap(NULL, page_size * 2, PROT_READ, MAP_SHARED, fd, 0);

	ASSERT_NE(MAP_FAILED, perf_page);



	/* Status should be updated */

	ASSERT_EQ(1 << reg.enable_bit, self->check);



	/* Ensure write shows up at correct offset */

	ASSERT_NE(-1, write(self->data_fd, &reg.write_index,

					sizeof(reg.write_index)));

	val = (void *)(((char *)perf_page) + perf_page->data_offset);

	ASSERT_EQ(PERF_RECORD_SAMPLE, *val);



	munmap(perf_page, page_size * 2);

	close(fd);



	/* Status should be updated */

	ASSERT_EQ(0, self->check);

}



int main(int argc, char **argv)

{

	return test_harness_run(argc, argv);