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selftests/user_events: Add perf 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 perf.

Link: https://lkml.kernel.org/r/20230606062027.1008398-5-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 14:20:27 +08:00 committed by Steven Rostedt (Google)
parent 4b56c21b11
commit 42187bdc3c
1 changed files with 53 additions and 0 deletions
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53
tools/testing/selftests/user_events/perf_test.c
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@ -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);