Commit 3e7269dd authored by sunliming's avatar sunliming Committed by Steven Rostedt (Google)
Browse files

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

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

Link: https://lkml.kernel.org/r/20230606062027.1008398-3-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 6f05dcab

tools/testing/selftests/user_events/ftrace_test.c

+33 −0
Original line number Diff line number Diff line
@@ -316,6 +316,39 @@ TEST_F(user, write_events) { 
	ASSERT_EQ(EINVAL, errno);

}



TEST_F(user, write_empty_events) {

	struct user_reg reg = {0};

	struct iovec io[1];

	int before = 0, after = 0;



	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);



	io[0].iov_base = &reg.write_index;

	io[0].iov_len = sizeof(reg.write_index);



	/* Register should work */

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

	ASSERT_EQ(0, reg.write_index);

	ASSERT_EQ(0, self->check);



	/* Enable event */

	self->enable_fd = open(enable_file, O_RDWR);

	ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))



	/* Event should now be enabled */

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



	/* Write should make it out to ftrace buffers */

	before = trace_bytes();

	ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 1));

	after = trace_bytes();

	ASSERT_GT(after, before);

}



TEST_F(user, write_fault) {

	struct user_reg reg = {0};

	struct iovec io[2];