drm/ttm: Implement intersect/compatible functions

Implemented a new intersect and compatible callback functions
to ttm range manager fetching start offset from drm mm range
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/20220820073304.178444-2-Arunpravin.PaneerSelvam@amd.com

drivers/gpu/drm/ttm/ttm_range_manager.c

@@ -113,6 +113,37 @@ static void ttm_range_man_free(struct ttm_resource_manager *man,
 	kfree(node);
 }
 
+static bool ttm_range_man_intersects(struct ttm_resource_manager *man,
+				     struct ttm_resource *res,
+				     const struct ttm_place *place,
+				     size_t size)
+{
+	struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
+	u32 num_pages = PFN_UP(size);
+
+	/* Don't evict BOs outside of the requested placement range */
+	if (place->fpfn >= (node->start + num_pages) ||
+	    (place->lpfn && place->lpfn <= node->start))
+		return false;
+
+	return true;
+}
+
+static bool ttm_range_man_compatible(struct ttm_resource_manager *man,
+				     struct ttm_resource *res,
+				     const struct ttm_place *place,
+				     size_t size)
+{
+	struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
+	u32 num_pages = PFN_UP(size);
+
+	if (node->start < place->fpfn ||
+	    (place->lpfn && (node->start + num_pages) > place->lpfn))
+		return false;
+
+	return true;
+}
+
 static void ttm_range_man_debug(struct ttm_resource_manager *man,
 				struct drm_printer *printer)
 {
@@ -126,6 +157,8 @@ static void ttm_range_man_debug(struct ttm_resource_manager *man,
 static const struct ttm_resource_manager_func ttm_range_manager_func = {
 	.alloc = ttm_range_man_alloc,
 	.free = ttm_range_man_free,
+	.intersects = ttm_range_man_intersects,
+	.compatible = ttm_range_man_compatible,
 	.debug = ttm_range_man_debug
 };