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drm/ttm: add TTM_PL_FLAG_TEMPORARY flag v3

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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: Christian König <christian.koenig@amd.com>
Signed-off-by: Lang Yu <Lang.Yu@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210622162339.761651-1-andrey.grodzovsky@amd.com
This commit is contained in:
Lang Yu 2021-06-22 12:23:34 -04:00 committed by Andrey Grodzovsky
parent 4037979257
commit ae1bef72c2
2 changed files with 8 additions and 2 deletions
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3
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -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];

7
include/drm/ttm/ttm_placement.h
View File

@ -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