Thomas any comments on this?
Is the purpose of this now clear enough?
Thanks,
Christian.
Am 01.06.21 um 14:25 schrieb Christian König:
From: Lang Yu <Lang.Yu@xxxxxxx>
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@xxxxxxx>
Signed-off-by: Lang Yu <Lang.Yu@xxxxxxx>
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo.c | 3 +++
include/drm/ttm/ttm_placement.h | 7 +++++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 51a94fd63bd7..6b393502198e 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -929,6 +929,9 @@ 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];
diff --git a/include/drm/ttm/ttm_placement.h b/include/drm/ttm/ttm_placement.h
index aa6ba4d0cf78..8995c9e4ec1b 100644
--- a/include/drm/ttm/ttm_placement.h
+++ b/include/drm/ttm/ttm_placement.h
@@ -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
