Re: [PATCH v6 1/6] drm/ttm: Add new callbacks to ttm res mgr

Christian König <christian.koenig@xxxxxxx> · Mon, 15 Aug 2022 13:05:08 +0200

Am 12.08.22 um 15:30 schrieb Arunpravin Paneer Selvam:
We are adding two new callbacks to ttm resource manager
function to handle intersection and compatibility of
placement and resources.

v2: move the amdgpu and ttm_range_manager changes to
     separate patches (Christian)
v3: rename "intersect" to "intersects" (Matthew)
v4: move !place check to the !res if and return false
     in ttm_resource_compatible() function (Christian)
v5: move bits of code from patch number 6 to avoid
     temporary driver breakup (Christian)

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

Patch #6 could still be cleaned up more now that we have the workaround 
code in patch #1, but that not really a must have.

Reviewed-by: Christian König <christian.koenig@xxxxxxx> for the entire 
series.

Do you already have commit rights?

Regards,
Christian.

---
  drivers/gpu/drm/ttm/ttm_bo.c       |  9 ++--
  drivers/gpu/drm/ttm/ttm_resource.c | 77 +++++++++++++++++++++++++++++-
  include/drm/ttm/ttm_resource.h     | 40 ++++++++++++++++
  3 files changed, 119 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index c1bd006a5525..f066e8124c50 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_intersects(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 20f9adcc3235..0d1f862a582b 100644
--- a/drivers/gpu/drm/ttm/ttm_resource.c
+++ b/drivers/gpu/drm/ttm/ttm_resource.c
@@ -253,10 +253,84 @@ void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res)
  }
  EXPORT_SYMBOL(ttm_resource_free);
  
+/**
+ * ttm_resource_intersects - test for intersection
+ *
+ * @bdev: TTM device structure
+ * @res: The resource to test
+ * @place: The placement to test
+ * @size: How many bytes the new allocation needs.
+ *
+ * Test if @res intersects with @place and @size. Used for testing if evictions
+ * are valueable or not.
+ *
+ * Returns true if the res placement intersects with @place and @size.
+ */
+bool ttm_resource_intersects(struct ttm_device *bdev,
+			     struct ttm_resource *res,
+			     const struct ttm_place *place,
+			     size_t size)
+{
+	struct ttm_resource_manager *man;
+
+	if (!res)
+		return false;
+
+	if (!place)
+		return true;
+
+	man = ttm_manager_type(bdev, res->mem_type);
+	if (!man->func->intersects) {
+		if (place->fpfn >= (res->start + res->num_pages) ||
+		    (place->lpfn && place->lpfn <= res->start))
+			return false;
+
+		return true;
+	}
+
+	return man->func->intersects(man, res, place, size);
+}
+
+/**
+ * ttm_resource_compatible - test for compatibility
+ *
+ * @bdev: TTM device structure
+ * @res: The resource to test
+ * @place: The placement to test
+ * @size: How many bytes the new allocation needs.
+ *
+ * Test if @res compatible with @place and @size.
+ *
+ * Returns true if the res placement compatible with @place and @size.
+ */
+bool ttm_resource_compatible(struct ttm_device *bdev,
+			     struct ttm_resource *res,
+			     const struct ttm_place *place,
+			     size_t size)
+{
+	struct ttm_resource_manager *man;
+
+	if (!res || !place)
+		return false;
+
+	man = ttm_manager_type(bdev, res->mem_type);
+	if (!man->func->compatible) {
+		if (res->start < place->fpfn ||
+		    (place->lpfn && (res->start + res->num_pages) > place->lpfn))
+			return false;
+
+		return true;
+	}
+
+	return man->func->compatible(man, res, place, size);
+}
+
  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)
@@ -265,8 +339,7 @@ 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) &&
diff --git a/include/drm/ttm/ttm_resource.h b/include/drm/ttm/ttm_resource.h
index ca89a48c2460..5afc6d664fde 100644
--- a/include/drm/ttm/ttm_resource.h
+++ b/include/drm/ttm/ttm_resource.h
@@ -88,6 +88,38 @@ struct ttm_resource_manager_func {
  	void (*free)(struct ttm_resource_manager *man,
  		     struct ttm_resource *res);
  
+	/**
+	 * struct ttm_resource_manager_func member intersects
+	 *
+	 * @man: Pointer to a memory type manager.
+	 * @res: Pointer to a struct ttm_resource to be checked.
+	 * @place: Placement to check against.
+	 * @size: Size of the check.
+	 *
+	 * Test if @res intersects with @place + @size. Used to judge if
+	 * evictions are valueable or not.
+	 */
+	bool (*intersects)(struct ttm_resource_manager *man,
+			   struct ttm_resource *res,
+			   const struct ttm_place *place,
+			   size_t size);
+
+	/**
+	 * struct ttm_resource_manager_func member compatible
+	 *
+	 * @man: Pointer to a memory type manager.
+	 * @res: Pointer to a struct ttm_resource to be checked.
+	 * @place: Placement to check against.
+	 * @size: Size of the check.
+	 *
+	 * Test if @res compatible with @place + @size. Used to check of
+	 * the need to move the backing store or not.
+	 */
+	bool (*compatible)(struct ttm_resource_manager *man,
+			   struct ttm_resource *res,
+			   const struct ttm_place *place,
+			   size_t size);
+
  	/**
  	 * struct ttm_resource_manager_func member debug
  	 *
@@ -329,6 +361,14 @@ int ttm_resource_alloc(struct ttm_buffer_object *bo,
  		       const struct ttm_place *place,
  		       struct ttm_resource **res);
  void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res);
+bool ttm_resource_intersects(struct ttm_device *bdev,
+			     struct ttm_resource *res,
+			     const struct ttm_place *place,
+			     size_t size);
+bool ttm_resource_compatible(struct ttm_device *bdev,
+			     struct ttm_resource *res,
+			     const struct ttm_place *place,
+			     size_t size);
  bool ttm_resource_compat(struct ttm_resource *res,
  			 struct ttm_placement *placement);
  void ttm_resource_set_bo(struct ttm_resource *res,

base-commit: 730c2bf4ad395acf0aa0820535fdb8ea6abe5df1







