[Intel-gfx] [PATCH 4/5] drm/i915: cpu-map based dumb buffers

[Chris Wilson]

Quoting Abdiel Janulgue (2019-10-22 08:52:55)
> 
> 
> On 21/10/2019 16.35, Chris Wilson wrote:
> > Quoting Abdiel Janulgue (2019-10-21 11:48:10)
> >> +int
> >> +i915_gem_mmap_dumb(struct drm_file *file,
> >> +                 struct drm_device *dev,
> >> +                 u32 handle,
> >> +                 u64 *offset)
> >> +{
> >> +       return __assign_gem_object_mmap_data(file, handle, I915_MMAP_TYPE_WC,
> > 
> > It still needs to do boot_cpu_has(PAT),
> 
> So we probably need a special use-case for GTT mmaps in those kind of
> hw, no?

enum type = boot_cpu_has(PAT) ? I915_MMAP_TYPE_WC : I915_MMAP_TYPE_GTT;

Of course the machines without PAT are also the ones with tiny GGTT.
-Chris