drm/amdgpu: Implement intersect/compatible functions

Implemented a new intersect and compatible callback function
fetching start offset from backend drm buddy allocator.
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220820073304.178444-3-Arunpravin.PaneerSelvam@amd.com

drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c

@@ -204,6 +204,42 @@ void amdgpu_gtt_mgr_recover(struct amdgpu_gtt_mgr *mgr)
 	amdgpu_gart_invalidate_tlb(adev);
 }
 
+/**
+ * amdgpu_gtt_mgr_intersects - test for intersection
+ *
+ * @man: Our manager object
+ * @res: The resource to test
+ * @place: The place for the new allocation
+ * @size: The size of the new allocation
+ *
+ * Simplified intersection test, only interesting if we need GART or not.
+ */
+static bool amdgpu_gtt_mgr_intersects(struct ttm_resource_manager *man,
+				      struct ttm_resource *res,
+				      const struct ttm_place *place,
+				      size_t size)
+{
+	return !place->lpfn || amdgpu_gtt_mgr_has_gart_addr(res);
+}
+
+/**
+ * amdgpu_gtt_mgr_compatible - test for compatibility
+ *
+ * @man: Our manager object
+ * @res: The resource to test
+ * @place: The place for the new allocation
+ * @size: The size of the new allocation
+ *
+ * Simplified compatibility test.
+ */
+static bool amdgpu_gtt_mgr_compatible(struct ttm_resource_manager *man,
+				      struct ttm_resource *res,
+				      const struct ttm_place *place,
+				      size_t size)
+{
+	return !place->lpfn || amdgpu_gtt_mgr_has_gart_addr(res);
+}
+
 /**
  * amdgpu_gtt_mgr_debug - dump VRAM table
  *
@@ -225,6 +261,8 @@ static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man,
 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
 	.alloc = amdgpu_gtt_mgr_new,
 	.free = amdgpu_gtt_mgr_del,
+	.intersects = amdgpu_gtt_mgr_intersects,
+	.compatible = amdgpu_gtt_mgr_compatible,
 	.debug = amdgpu_gtt_mgr_debug
 };
 

drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c

@@ -720,6 +720,72 @@ uint64_t amdgpu_vram_mgr_vis_usage(struct amdgpu_vram_mgr *mgr)
 	return atomic64_read(&mgr->vis_usage);
 }
 
+/**
+ * amdgpu_vram_mgr_intersects - test each drm buddy block for intersection
+ *
+ * @man: TTM memory type manager
+ * @res: The resource to test
+ * @place: The place to test against
+ * @size: Size of the new allocation
+ *
+ * Test each drm buddy block for intersection for eviction decision.
+ */
+static bool amdgpu_vram_mgr_intersects(struct ttm_resource_manager *man,
+				       struct ttm_resource *res,
+				       const struct ttm_place *place,
+				       size_t size)
+{
+	struct amdgpu_vram_mgr_resource *mgr = to_amdgpu_vram_mgr_resource(res);
+	struct drm_buddy_block *block;
+
+	/* Check each drm buddy block individually */
+	list_for_each_entry(block, &mgr->blocks, link) {
+		unsigned long fpfn =
+			amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
+		unsigned long lpfn = fpfn +
+			(amdgpu_vram_mgr_block_size(block) >> PAGE_SHIFT);
+
+		if (place->fpfn < lpfn &&
+		    (place->lpfn && place->lpfn > fpfn))
+			return true;
+	}
+
+	return false;
+}
+
+/**
+ * amdgpu_vram_mgr_compatible - test each drm buddy block for compatibility
+ *
+ * @man: TTM memory type manager
+ * @res: The resource to test
+ * @place: The place to test against
+ * @size: Size of the new allocation
+ *
+ * Test each drm buddy block for placement compatibility.
+ */
+static bool amdgpu_vram_mgr_compatible(struct ttm_resource_manager *man,
+				       struct ttm_resource *res,
+				       const struct ttm_place *place,
+				       size_t size)
+{
+	struct amdgpu_vram_mgr_resource *mgr = to_amdgpu_vram_mgr_resource(res);
+	struct drm_buddy_block *block;
+
+	/* Check each drm buddy block individually */
+	list_for_each_entry(block, &mgr->blocks, link) {
+		unsigned long fpfn =
+			amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
+		unsigned long lpfn = fpfn +
+			(amdgpu_vram_mgr_block_size(block) >> PAGE_SHIFT);
+
+		if (fpfn < place->fpfn ||
+		    (place->lpfn && lpfn > place->lpfn))
+			return false;
+	}
+
+	return true;
+}
+
 /**
  * amdgpu_vram_mgr_debug - dump VRAM table
  *
@@ -753,6 +819,8 @@ static void amdgpu_vram_mgr_debug(struct ttm_resource_manager *man,
 static const struct ttm_resource_manager_func amdgpu_vram_mgr_func = {
 	.alloc	= amdgpu_vram_mgr_new,
 	.free	= amdgpu_vram_mgr_del,
+	.intersects = amdgpu_vram_mgr_intersects,
+	.compatible = amdgpu_vram_mgr_compatible,
 	.debug	= amdgpu_vram_mgr_debug
 };