Commit 2eda4fc6 authored by Matthew Auld's avatar Matthew Auld
Browse files

drm/i915/ttm: use cached system pages when evicting lmem 



This should let us do an accelerated copy directly to the shmem pages
when temporarily moving lmem-only objects, where the i915-gem shrinker
can later kick in to swap out the pages, if needed.

Signed-off-by: default avatarMatthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: default avatarThomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211018091055.1998191-7-matthew.auld@intel.com
parent ebd4a8ec

drivers/gpu/drm/i915/gem/i915_gem_ttm.c

+4 −4
Original line number Diff line number Diff line
@@ -134,11 +134,11 @@ static enum ttm_caching 
i915_ttm_select_tt_caching(const struct drm_i915_gem_object *obj)

{

	/*

	 * Objects only allowed in system get cached cpu-mappings.

	 * Other objects get WC mapping for now. Even if in system.

	 * Objects only allowed in system get cached cpu-mappings, or when

	 * evicting lmem-only buffers to system for swapping. Other objects get

	 * WC mapping for now. Even if in system.

	 */

	if (obj->mm.region->type == INTEL_MEMORY_SYSTEM &&

	    obj->mm.n_placements <= 1)

	if (obj->mm.n_placements <= 1)

		return ttm_cached;



	return ttm_write_combined;