drm/i915: enable platform support for 64K pages

For gen9+ enable platform level support for 64K pages. Also enable for
mock testing.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-21-matthew.auld@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006221833.32439-20-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_pci.c

@@ -436,7 +436,8 @@ static const struct intel_device_info intel_cherryview_info __initconst = {
 };
 
 #define GEN9_DEFAULT_PAGE_SIZES \
-	.page_sizes = I915_GTT_PAGE_SIZE_4K
+	.page_sizes = I915_GTT_PAGE_SIZE_4K | \
+		      I915_GTT_PAGE_SIZE_64K
 
 #define GEN9_FEATURES \
 	GEN8_FEATURES, \

drivers/gpu/drm/i915/selftests/mock_gem_device.c

@@ -175,7 +175,8 @@ struct drm_i915_private *mock_gem_device(void)
 	mkwrite_device_info(i915)->gen = -1;
 
 	mkwrite_device_info(i915)->page_sizes =
-		I915_GTT_PAGE_SIZE_4K;
+		I915_GTT_PAGE_SIZE_4K |
+		I915_GTT_PAGE_SIZE_64K;
 
 	spin_lock_init(&i915->mm.object_stat_lock);
 	mock_uncore_init(i915);