[Intel-gfx] [PATCH] drm/i915: Flag the execlists context object as dirty after every use

[Daniel Vetter]

On Fri, Aug 14, 2015 at 12:59:19PM +0100, Chris Wilson wrote:
> Everytime we use the logical context with execlists it becomes dirty (as
> the hardware will write the new register values afterwards, as well as
> the GPU state that will be used). We need to then flag the context as
> dirty everytime since after a swap-out/swap-in cycle the dirty flag will
> be cleared, and a further swap-out cycle will then loose the most recent
> GPU state.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: stable at vger.kernel.org

Yay for reinventing active tracking I guess, legacy hw ctx has this
already. Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
-Daniel
> ---
>  drivers/gpu/drm/i915/intel_lrc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> index 138964afd187..41cfa6fa909d 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -1013,6 +1013,8 @@ static int intel_lr_context_pin(struct drm_i915_gem_request *rq)
>  		ret = intel_pin_and_map_ringbuffer_obj(ring->dev, ringbuf);
>  		if (ret)
>  			goto unpin_ctx_obj;
> +
> +		ctx_obj->dirty = true;
>  	}
>  
>  	return ret;
> -- 
> 2.5.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch