2023-06-14 17:11:22

by Beau Belgrave

Subject: [PATCH v3 4/6] selftests/user_events: Ensure auto cleanup works as expected

User events now auto cleanup upon the last reference put. Update
ftrace_test to ensure this works as expected. Ensure EBUSY delays
while event is being deleted do not cause transient failures by
waiting and re-attempting.

Signed-off-by: Beau Belgrave <[email protected]>
---
.../selftests/user_events/ftrace_test.c | 49 ++++++++++++++-----
1 file changed, 38 insertions(+), 11 deletions(-)

diff --git a/tools/testing/selftests/user_events/ftrace_test.c b/tools/testing/selftests/user_events/ftrace_test.c
index abfb49558a26..eb6904d89f14 100644
--- a/tools/testing/selftests/user_events/ftrace_test.c
+++ b/tools/testing/selftests/user_events/ftrace_test.c
@@ -102,30 +102,56 @@ static int get_print_fmt(char *buffer, int len)
return -1;
}

+static bool wait_for_delete(void)
+{
+ int i;
+
+ for (i = 0; i < 1000; ++i) {
+ int fd = open(enable_file, O_RDONLY);
+
+ if (fd == -1)
+ return true;
+
+ close(fd);
+ usleep(1000);
+ }
+
+ return false;
+}
+
static int clear(int *check)
{
struct user_unreg unreg = {0};
+ int fd;

unreg.size = sizeof(unreg);
unreg.disable_bit = 31;
unreg.disable_addr = (__u64)check;

- int fd = open(data_file, O_RDWR);
+ fd = open(data_file, O_RDWR);

if (fd == -1)
return -1;

if (ioctl(fd, DIAG_IOCSUNREG, &unreg) == -1)
if (errno != ENOENT)
- return -1;
-
- if (ioctl(fd, DIAG_IOCSDEL, "__test_event") == -1)
- if (errno != ENOENT)
- return -1;
+ goto fail;
+
+ if (ioctl(fd, DIAG_IOCSDEL, "__test_event") == -1) {
+ if (errno == EBUSY) {
+ if (!wait_for_delete())
+ goto fail;
+ } else if (errno != ENOENT)
+ goto fail;
+ }

close(fd);

return 0;
+fail:
+ close(fd);
+
+ return -1;
}

static int check_print_fmt(const char *event, const char *expected, int *check)
@@ -155,9 +181,8 @@ static int check_print_fmt(const char *event, const char *expected, int *check)
/* Register should work */
ret = ioctl(fd, DIAG_IOCSREG, &reg);

- close(fd);
-
if (ret != 0) {
+ close(fd);
printf("Reg failed in fmt\n");
return ret;
}
@@ -165,6 +190,8 @@ static int check_print_fmt(const char *event, const char *expected, int *check)
/* Ensure correct print_fmt */
ret = get_print_fmt(print_fmt, sizeof(print_fmt));

+ close(fd);
+
if (ret != 0)
return ret;

@@ -256,10 +283,10 @@ TEST_F(user, register_events) {
unreg.disable_bit = 30;
ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSUNREG, &unreg));

- /* Delete should work only after close and unregister */
+ /* Delete should have been auto-done after close and unregister */
close(self->data_fd);
- self->data_fd = open(data_file, O_RDWR);
- ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSDEL, "__test_event"));
+
+ ASSERT_EQ(true, wait_for_delete());
}

TEST_F(user, write_events) {
--
2.25.1