Re: [PATCH 08/15] drm/i915: Clear execlist port[] before updating seqno on wedging

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

Chris Wilson <chris@chris-wilson.co.uk> writes:

> When we wedge the device, we clear out the in-flight requests and
> advance the breadcrumb to indicate they are complete. However, the
> breadcrumb advance includes an assert that the engine is idle, so that
> advancement needs to be the last step to ensure we pass our own sanity
> checks.

I am confused about this one. The previous patch seems to make
the concern void.

-Mika

>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> ---
>  drivers/gpu/drm/i915/i915_gem.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 580b5042f4f7..40e94b4ef532 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -3114,13 +3114,6 @@ static void engine_set_wedged(struct intel_engine_cs *engine)
>  			dma_fence_set_error(&request->fence, -EIO);
>  	spin_unlock_irqrestore(&engine->timeline->lock, flags);
>  
> -	/* Mark all pending requests as complete so that any concurrent
> -	 * (lockless) lookup doesn't try and wait upon the request as we
> -	 * reset it.
> -	 */
> -	intel_engine_init_global_seqno(engine,
> -				       intel_engine_last_submit(engine));
> -
>  	/*
>  	 * Clear the execlists queue up before freeing the requests, as those
>  	 * are the ones that keep the context and ringbuffer backing objects
> @@ -3149,6 +3142,13 @@ static void engine_set_wedged(struct intel_engine_cs *engine)
>  		 */
>  		clear_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted);
>  	}
> +
> +	/* Mark all pending requests as complete so that any concurrent
> +	 * (lockless) lookup doesn't try and wait upon the request as we
> +	 * reset it.
> +	 */
> +	intel_engine_init_global_seqno(engine,
> +				       intel_engine_last_submit(engine));
>  }
>  
>  static int __i915_gem_set_wedged_BKL(void *data)
> -- 
> 2.13.2
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