[PATCH i-g-t 1/3] tests/intel/xe_eu_stall: Close any open EU stall fd before opening a new one

[Harish Chegondi]

On Wed, Jun 04, 2025 at 04:53:14PM -0700, Dixit, Ashutosh wrote:
> On Tue, 03 Jun 2025 16:57:34 -0700, Harish Chegondi wrote:
> >
> > asserts in a sub-test can prevent closing an EU stall fd and the next
> > subtest may fail with EBUSY if it tries to open another EU stall fd
> > as there can only be one EU stall stream open at a time. Any open fds
> > are automatically closed at the end of a test (last sub-test).
> >
> > Cc: Ashutosh Dixit <ashutosh.dixit at intel.com>
> > Signed-off-by: Harish Chegondi <harish.chegondi at intel.com>
> 
> So -EBUSY errors are gone with this patch, correct? So this is:
Yes, -EBUSY errors will be gone with this patch.
> 
> Reviewed-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
> 
Thank You
Harish.
> > ---
> >  tests/intel/xe_eu_stall.c | 34 ++++++++++++++++++++++++++--------
> >  1 file changed, 26 insertions(+), 8 deletions(-)
> >
> > diff --git a/tests/intel/xe_eu_stall.c b/tests/intel/xe_eu_stall.c
> > index 411c30871..1499ec4b4 100644
> > --- a/tests/intel/xe_eu_stall.c
> > +++ b/tests/intel/xe_eu_stall.c
> > @@ -69,6 +69,7 @@ static uint8_t p_gt_id;
> >  static uint32_t p_rate;
> >  static uint32_t p_user = DEFAULT_USER_BUF_SIZE;
> >  static uint32_t p_num_reports = DEFAULT_NUM_REPORTS;
> > +static int stream_fd = -1;
> >
> >  static volatile bool child_is_running = true;
> >
> > @@ -302,6 +303,25 @@ static void set_fd_flags(int fd, int flags)
> >	igt_assert_eq(0, fcntl(fd, F_SETFL, old | flags));
> >  }
> >
> > +static void eu_stall_close(int fd)
> > +{
> > +	close(fd);
> > +	stream_fd = -1;
> > +}
> > +
> > +static int eu_stall_open(int drm_fd, struct xe_eu_stall_open_prop *props)
> > +{
> > +	int ret;
> > +
> > +	if (stream_fd >= 0)
> > +		eu_stall_close(stream_fd);
> > +
> > +	ret = xe_eu_stall_ioctl(drm_fd, DRM_XE_OBSERVATION_OP_STREAM_OPEN, props);
> > +	igt_require_fd(ret);
> > +
> > +	return ret;
> > +}
> > +
> >  /*
> >   * Verify that tests with invalid arguments fail.
> >   */
> > @@ -353,7 +373,7 @@ static inline void disable_paranoid(void)
> >   */
> >  static void test_non_privileged_access(int drm_fd)
> >  {
> > -	int paranoid, stream_fd;
> > +	int paranoid;
> >
> >	paranoid = read_u64_file(OBSERVATION_PARANOID);
> >
> > @@ -395,9 +415,8 @@ static void test_non_privileged_access(int drm_fd)
> >
> >		igt_drop_root();
> >
> > -		stream_fd = xe_eu_stall_ioctl(drm_fd, DRM_XE_OBSERVATION_OP_STREAM_OPEN, &props);
> > -		igt_require_fd(stream_fd);
> > -		close(stream_fd);
> > +		stream_fd = eu_stall_open(drm_fd, &props);
> > +		eu_stall_close(stream_fd);
> >	}
> >
> >	igt_waitchildren();
> > @@ -472,7 +491,7 @@ static void test_eustall(int drm_fd, uint32_t devid, bool blocking_read, int ite
> >	uint32_t num_samples, num_drops;
> >	struct igt_helper_process work_load = {};
> >	struct sigaction sa = { 0 };
> > -	int ret, flags, stream_fd;
> > +	int ret, flags;
> >	uint64_t total_size;
> >	uint8_t *buf;
> >
> > @@ -518,8 +537,7 @@ static void test_eustall(int drm_fd, uint32_t devid, bool blocking_read, int ite
> >		properties[3] = query_eu_stall_data->sampling_rates[0];
> >	igt_info("Sampling Rate: %lu\n", properties[3]);
> >
> > -	stream_fd = xe_eu_stall_ioctl(drm_fd, DRM_XE_OBSERVATION_OP_STREAM_OPEN, &props);
> > -	igt_require_fd(stream_fd);
> > +	stream_fd = eu_stall_open(drm_fd, &props);
> >
> >	if (!blocking_read)
> >		flags = O_CLOEXEC | O_NONBLOCK;
> > @@ -592,7 +610,7 @@ enable:
> >	if (--iter)
> >		goto enable;
> >
> > -	close(stream_fd);
> > +	eu_stall_close(stream_fd);
> >	free(buf);
> >  }
> >
> > --
> > 2.48.1
> >