[Intel-gfx] [PATCH 5/5] drm/i915/userptr: Enable read-only support on gen8+

[Bloomfield, Jon]

> -----Original Message-----
> From: Chris Wilson <chris at chris-wilson.co.uk>
> Sent: Thursday, June 14, 2018 5:00 AM
> To: intel-gfx at lists.freedesktop.org
> Cc: Chris Wilson <chris at chris-wilson.co.uk>; Bloomfield, Jon
> <jon.bloomfield at intel.com>; Joonas Lahtinen
> <joonas.lahtinen at linux.intel.com>
> Subject: [PATCH 5/5] drm/i915/userptr: Enable read-only support on gen8+
> 
> On gen8 and onwards, we can mark GPU accesses through the ppGTT as
> being
> read-only, that is cause any GPU write onto that page to be discarded
> (not triggering a fault). This is all that we need to finally support
> the read-only flag for userptr!
> 
> Testcase: igt/gem_userptr_blits/readonly*
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Jon Bloomfield <jon.bloomfield at intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> ---
Reviewed-by: Jon Bloomfield <jon.bloomfield at intel.com>