Re: [PATCH 3/4] tests/intel/xe_oa: Enable capture just prior to reading OA data

["Dixit, Ashutosh" <ashutosh.dixit@intel.com>]

On Fri, 17 Jul 2026 14:00:31 -0700, Umesh Nerlige Ramappa wrote:
>
> When running the test in a loop, sometimes the buffer overflow error was
> seen with smaller buffer sizes.
> To make the non-zero-reason test more robust, enable capture just before
> reading the data and surround the read with the load helper calls.

Hmm, not sure why this patch should make a difference... Anyway, since you
seem to be saying it does, and because it is mostly equivalent to previous
code, this is:

Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>

>
> Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
> ---
>  tests/intel/xe_oa.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/tests/intel/xe_oa.c b/tests/intel/xe_oa.c
> index 98f00d377a86..4f652b187bae 100644
> --- a/tests/intel/xe_oa.c
> +++ b/tests/intel/xe_oa.c
> @@ -2678,6 +2678,7 @@ test_non_zero_reason(const struct drm_xe_oa_unit *oau, size_t oa_buffer_size)
>		DRM_XE_OA_PROPERTY_OA_METRIC_SET, test_set->perf_oa_metrics_set,
>		DRM_XE_OA_PROPERTY_OA_FORMAT, __ff(fmt),
>		DRM_XE_OA_PROPERTY_OA_PERIOD_EXPONENT, oa_exponent,
> +		DRM_XE_OA_PROPERTY_OA_DISABLED, true,
>		DRM_XE_OA_PROPERTY_OA_BUFFER_SIZE, oa_buffer_size ?: buffer_fill_size
>	};
>	struct intel_xe_oa_open_prop param = {
> @@ -2705,16 +2706,16 @@ test_non_zero_reason(const struct drm_xe_oa_unit *oau, size_t oa_buffer_size)
>	igt_assert(buf);
>
>	igt_debug("Ready to read about %u bytes\n", buf_size);
> -
> -	load_helper_init();
> -	load_helper_run(HIGH);
> -
>	if (!oa_buffer_size)
>		param.num_properties = param.num_properties - 1;
>
>	stream_fd = __perf_open(drm_fd, &param, true /* prevent_pm */);
>          set_fd_flags(stream_fd, O_CLOEXEC);
>
> +	load_helper_init();
> +	load_helper_run(HIGH);
> +
> +	do_ioctl(stream_fd, DRM_XE_OBSERVATION_IOCTL_ENABLE, 0);
>	while (total_len < buf_size &&
>	       ((len = read(stream_fd, &buf[total_len], buf_size - total_len)) > 0 ||
>		(len == -1 && (errno == EINTR || errno == EIO)))) {
> --
> 2.51.0
>