[Intel-gfx] [PATCH v2] drm/i915/guc: Check for wedged before doing stuff

[Matthew Brost]

On Tue, Dec 21, 2021 at 01:02:12PM -0800, John.C.Harrison at Intel.com wrote:
> From: John Harrison <John.C.Harrison at Intel.com>
> 
> A fault injection probe test hit a BUG_ON in a GuC error path. It
> showed that the GuC code could potentially attempt to do many things
> when the device is actually wedged. So, add a check in to prevent that.
> 
> v2: Use intel_gt_is_wedged instead of testing bits directly in the
> GuC submission code (review feedback from Tvrtko).
> 
> Signed-off-by: John Harrison <John.C.Harrison at Intel.com>

Reviewed-by: Matthew Brost <matthew.brost at intel.com>

> ---
>  drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> index e7517206af82..756b29d8326b 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> @@ -1349,7 +1349,8 @@ submission_disabled(struct intel_guc *guc)
>  	struct i915_sched_engine * const sched_engine = guc->sched_engine;
>  
>  	return unlikely(!sched_engine ||
> -			!__tasklet_is_enabled(&sched_engine->tasklet));
> +			!__tasklet_is_enabled(&sched_engine->tasklet) ||
> +			intel_gt_is_wedged(guc_to_gt(guc)));
>  }
>  
>  static void disable_submission(struct intel_guc *guc)
> @@ -1725,7 +1726,7 @@ void intel_guc_submission_reset_finish(struct intel_guc *guc)
>  {
>  	/* Reset called during driver load or during wedge? */
>  	if (unlikely(!guc_submission_initialized(guc) ||
> -		     test_bit(I915_WEDGED, &guc_to_gt(guc)->reset.flags))) {
> +		     intel_gt_is_wedged(guc_to_gt(guc)))) {
>  		return;
>  	}
>  
> -- 
> 2.25.1
>