Re: [PATCH v3 6/6] drm/ttm: Switch to using the new res callback

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On 28/07/2022 15:33, Arunpravin Paneer Selvam wrote:
Apply new intersect and compatible callback instead
of having a generic placement range verfications.

v2: Added a separate callback for compatiblilty
     checks (Christian)

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@xxxxxxx>

There is also some code at the bottom of i915_ttm_buddy_man_alloc() playing games with res->start, which I think can be safely deleted with this series (now that we have proper ->compatible() hook).

Also, is the plan to remove res->start completely, or does that still have a use?

---
  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 45 +++++++------------------
  drivers/gpu/drm/ttm/ttm_bo.c            |  9 +++--
  drivers/gpu/drm/ttm/ttm_resource.c      |  5 +--
  3 files changed, 20 insertions(+), 39 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 170935c294f5..7d25a10395c0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1328,11 +1328,12 @@ uint64_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
  static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
  					    const struct ttm_place *place)
  {
-	unsigned long num_pages = bo->resource->num_pages;
  	struct dma_resv_iter resv_cursor;
-	struct amdgpu_res_cursor cursor;
  	struct dma_fence *f;
+ if (!amdgpu_bo_is_amdgpu_bo(bo))
+		return ttm_bo_eviction_valuable(bo, place);
+
  	/* Swapout? */
  	if (bo->resource->mem_type == TTM_PL_SYSTEM)
  		return true;
@@ -1351,40 +1352,20 @@ static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
  			return false;
  	}
- switch (bo->resource->mem_type) {
-	case AMDGPU_PL_PREEMPT:
-		/* Preemptible BOs don't own system resources managed by the
-		 * driver (pages, VRAM, GART space). They point to resources
-		 * owned by someone else (e.g. pageable memory in user mode
-		 * or a DMABuf). They are used in a preemptible context so we
-		 * can guarantee no deadlocks and good QoS in case of MMU
-		 * notifiers or DMABuf move notifiers from the resource owner.
-		 */
+	/* Preemptible BOs don't own system resources managed by the
+	 * driver (pages, VRAM, GART space). They point to resources
+	 * owned by someone else (e.g. pageable memory in user mode
+	 * or a DMABuf). They are used in a preemptible context so we
+	 * can guarantee no deadlocks and good QoS in case of MMU
+	 * notifiers or DMABuf move notifiers from the resource owner.
+	 */
+	if (bo->resource->mem_type == AMDGPU_PL_PREEMPT)
  		return false;
-	case TTM_PL_TT:
-		if (amdgpu_bo_is_amdgpu_bo(bo) &&
-		    amdgpu_bo_encrypted(ttm_to_amdgpu_bo(bo)))
-			return false;
-		return true;
- case TTM_PL_VRAM:
-		/* Check each drm MM node individually */
-		amdgpu_res_first(bo->resource, 0, (u64)num_pages << PAGE_SHIFT,
-				 &cursor);
-		while (cursor.remaining) {
-			if (place->fpfn < PFN_DOWN(cursor.start + cursor.size)
-			    && !(place->lpfn &&
-				 place->lpfn <= PFN_DOWN(cursor.start)))
-				return true;
-
-			amdgpu_res_next(&cursor, cursor.size);
-		}
+	if (bo->resource->mem_type == TTM_PL_TT &&
+	    amdgpu_bo_encrypted(ttm_to_amdgpu_bo(bo)))
  		return false;
- default:
-		break;
-	}
-
  	return ttm_bo_eviction_valuable(bo, place);
  }
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index c1bd006a5525..03409409e43e 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -518,6 +518,9 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
  bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
  			      const struct ttm_place *place)
  {
+	struct ttm_resource *res = bo->resource;
+	struct ttm_device *bdev = bo->bdev;
+
  	dma_resv_assert_held(bo->base.resv);
  	if (bo->resource->mem_type == TTM_PL_SYSTEM)
  		return true;
@@ -525,11 +528,7 @@ bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
  	/* Don't evict this BO if it's outside of the
  	 * requested placement range
  	 */
-	if (place->fpfn >= (bo->resource->start + bo->resource->num_pages) ||
-	    (place->lpfn && place->lpfn <= bo->resource->start))
-		return false;
-
-	return true;
+	return ttm_resource_intersect(bdev, res, place, bo->base.size);
  }
  EXPORT_SYMBOL(ttm_bo_eviction_valuable);
diff --git a/drivers/gpu/drm/ttm/ttm_resource.c b/drivers/gpu/drm/ttm/ttm_resource.c
index 84a6fe9e976e..c745faf72b1a 100644
--- a/drivers/gpu/drm/ttm/ttm_resource.c
+++ b/drivers/gpu/drm/ttm/ttm_resource.c
@@ -316,6 +316,8 @@ static bool ttm_resource_places_compat(struct ttm_resource *res,
  				       const struct ttm_place *places,
  				       unsigned num_placement)
  {
+	struct ttm_buffer_object *bo = res->bo;
+	struct ttm_device *bdev = bo->bdev;
  	unsigned i;
if (res->placement & TTM_PL_FLAG_TEMPORARY)
@@ -324,8 +326,7 @@ static bool ttm_resource_places_compat(struct ttm_resource *res,
  	for (i = 0; i < num_placement; i++) {
  		const struct ttm_place *heap = &places[i];
- if (res->start < heap->fpfn || (heap->lpfn &&
-		    (res->start + res->num_pages) > heap->lpfn))
+		if (!ttm_resource_compatible(bdev, res, heap, bo->base.size))
  			continue;
if ((res->mem_type == heap->mem_type) &&



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