[Intel-gfx] [PATCH 1/5] drm/i915/gtt: Add read only pages to gen8_pte_encode

[Matthew Auld]

On 31 May 2018 at 12:35, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> From: Jon Bloomfield <jon.bloomfield at intel.com>
>
> We can set a bit inside the ppGTT PTE to indicate a page is read-only;
> writes from the GPU will be discarded. We can use this to protect pages
> and in particular support read-only userptr mappings (necessary for
> importing PROT_READ vma).
>
> Signed-off-by: Jon Bloomfield <jon.bloomfield at intel.com>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Matthew Auld <matthew.william.auld at gmail.com>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

fwiw I didn't see any surprises with ro 2M/64K PTEs when testing locally.

For the series:
Reviewed-by: Matthew Auld <matthew.william.auld at gmail.com>