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

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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: Beau Belgrave <beaub@linux.microsoft.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: sunliming <sunliming@kylinos.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
sunliming 2023-06-06 14:20:25 +08:00 committed by Steven Rostedt (Google)
parent 6f05dcabe5
commit 3e7269dd5f
1 changed files with 33 additions and 0 deletions
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33
tools/testing/selftests/user_events/ftrace_test.c
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@ -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];