On Thu, Jan 30, 2014 at 02:38:16PM +0000, Chris Wilson wrote:
> We want to use the GTT for reading back objects upon an error so that we
> have exactly the information that the GPU saw. However, it is verboten
> to access snoopable pages through the GTT and causes my PineView GPU to
> throw a page fault instead.
>
> This has not been a problem in the past as we only dumped ringbuffers
> and batchbuffers, both of which must be uncached. However, the
> introduction of HWS page dumping leads to a read of a snooped object
> through the GTT. This was introduced by
>
> commit f3ce3821393e31a3f1a8ca6c24eb2d735a428445
> Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Date: Thu Jan 23 22:40:36 2014 +0000
>
> drm/i915: Include HW status page in error capture
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_gpu_error.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> index 6d5ab945132c..3b18c2dff3b8 100644
> --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> @@ -527,7 +527,8 @@ i915_error_object_create_sized(struct drm_i915_private *dev_priv,
> goto unwind;
>
> local_irq_save(flags);
> - if (reloc_offset < dev_priv->gtt.mappable_end &&
> + if (src->cache_level == I915_CACHE_NONE &&
> + reloc_offset < dev_priv->gtt.mappable_end &&
> src->has_global_gtt_mapping &&
> i915_is_ggtt(vm)) {
> void __iomem *s;
So you don't want to make it (cache_level == NONE || HAS_LLC)?
--
Ville Syrjälä
Intel OTC
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