Re: [PATCH 1/6] drm/ttm: add TTM_PL_FLAG_TEMPORARY flag v3

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Thanks Nirmoy.

Pushed to drm-misc-next.

Andrey

On 2021-06-23 2:18 p.m., Das, Nirmoy wrote:
Tried on vmwgfx and amdgpu, everything looks fine. I would have love to do a kfdtest as

I think kfdtest does bo movement tests but it seems kfdtest regressing even before this series. Trying to debug that.


The series is Acked-by: Nirmoy Das <nirmoy.das@xxxxxxx>


On 6/22/2021 6:23 PM, Andrey Grodzovsky wrote:
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 db53fecca696..45145d02aed2 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -913,6 +913,9 @@ 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



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