[Intel-gfx] [PATCH 3/5] drm/i915: introduce i915_hangcheck_ring_hung

[Ben Widawsky]

On Mon, May 13, 2013 at 04:32:11PM +0300, Mika Kuoppala wrote:
> In preparation to track per ring progress in hangcheck,
> add i915_hangcheck_ring_hung.
> 
> v2: omit dev parameter (Ben Widawsky)
> 
> Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>

With the updated patch 2, patches 1-3 are:
Reviewed-by: Ben Widawsky <ben at bwidawsk.net>

I'm on vacation, so I won't get to 4 & 5 for a few days.

> ---
>  drivers/gpu/drm/i915/i915_irq.c |   29 +++++++++++++++++------------
>  1 file changed, 17 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 004ad34..6efe3b0 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2345,28 +2345,33 @@ static bool kick_ring(struct intel_ring_buffer *ring)
>  	return false;
>  }
>  
> +static bool i915_hangcheck_ring_hung(struct intel_ring_buffer *ring)
> +{
> +	if (IS_GEN2(ring->dev))
> +		return false;
> +
> +	/* Is the chip hanging on a WAIT_FOR_EVENT?
> +	 * If so we can simply poke the RB_WAIT bit
> +	 * and break the hang. This should work on
> +	 * all but the second generation chipsets.
> +	 */
> +	return !kick_ring(ring);
> +}
> +
>  static bool i915_hangcheck_hung(struct drm_device *dev)
>  {
>  	drm_i915_private_t *dev_priv = dev->dev_private;
>  
>  	if (dev_priv->gpu_error.hangcheck_count++ > 1) {
>  		bool hung = true;
> +		struct intel_ring_buffer *ring;
> +		int i;
>  
>  		DRM_ERROR("Hangcheck timer elapsed... GPU hung\n");
>  		i915_handle_error(dev, true);
>  
> -		if (!IS_GEN2(dev)) {
> -			struct intel_ring_buffer *ring;
> -			int i;
> -
> -			/* Is the chip hanging on a WAIT_FOR_EVENT?
> -			 * If so we can simply poke the RB_WAIT bit
> -			 * and break the hang. This should work on
> -			 * all but the second generation chipsets.
> -			 */
> -			for_each_ring(ring, dev_priv, i)
> -				hung &= !kick_ring(ring);
> -		}
> +		for_each_ring(ring, dev_priv, i)
> +			hung &= i915_hangcheck_ring_hung(ring);
>  
>  		return hung;
>  	}
> -- 
> 1.7.9.5
> 
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-- 
Ben Widawsky, Intel Open Source Technology Center