Commit ae1bef72 authored by Lang Yu's avatar Lang Yu Committed by Andrey Grodzovsky
Browse files

drm/ttm: add TTM_PL_FLAG_TEMPORARY flag v3 



Sometimes drivers need to use bounce buffers to evict BOs. While those reside
in some domain they are not necessarily suitable for CS.

Add a flag so that drivers can note that a bounce buffers needs to be
reallocated during validation.

v2: add detailed comments
v3 (chk): merge commits and rework commit message

Suggested-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarLang Yu <Lang.Yu@amd.com>
Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAndrey Grodzovsky <andrey.grodzovsky@amd.com>
Acked-by: default avatarNirmoy Das <nirmoy.das@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210622162339.761651-1-andrey.grodzovsky@amd.com
parent 40379792

drivers/gpu/drm/ttm/ttm_bo.c

+3 −0
Original line number Diff line number Diff line
@@ -918,6 +918,9 @@ static bool ttm_bo_places_compat(const struct ttm_place *places, 
{

	unsigned i;



	if (mem->placement & TTM_PL_FLAG_TEMPORARY)

		return false;



	for (i = 0; i < num_placement; i++) {

		const struct ttm_place *heap = &places[i];

include/drm/ttm/ttm_placement.h

+5 −2
Original line number Diff line number Diff line
@@ -47,8 +47,11 @@ 
 * top of the memory area, instead of the bottom.

 */



#define TTM_PL_FLAG_CONTIGUOUS  (1 << 19)

#define TTM_PL_FLAG_TOPDOWN     (1 << 22)

#define TTM_PL_FLAG_CONTIGUOUS  (1 << 0)

#define TTM_PL_FLAG_TOPDOWN     (1 << 1)



/* For multihop handling */

#define TTM_PL_FLAG_TEMPORARY   (1 << 2)



/**

 * struct ttm_place