[Intel-gfx] [PATCH] drm/i915: Handle unmappable buffers during error state capture

[Eugeni Dodonov]

On Tue, Nov 29, 2011 at 17:02, Chris Wilson <chris at chris-wilson.co.uk>wrote:

> As the buffer is not necessarily accessible through the GTT at the time
> of a GPU hang, and capturing some of its contents is far more valuable
> than skipping it, provide a clflushed fallback read path. We still
> prefer to read through the GTT as that is more consistent with the GPU
> access of the same buffer. So example it will demonstrate any errorneous
> tiling or swizzling of the command buffer as seen by the GPU.
>
> This becomes necessary with use of CPU relocations and lazy GTT binding,
> but could potentially happen anyway as a result of a pathological error.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
>

Reviewed-by: Eugeni Dodonov <eugeni.dodonov at intel.com>

-- 
Eugeni Dodonov
<http://eugeni.dodonov.net/>
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