drm/amdgpu: switch the GTT backend to self alloc

Similar to the TTM range manager.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210602100914.46246-6-christian.koenig@amd.com

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

@@ -22,11 +22,13 @@
  * Authors: Christian König
  */
 
+#include <drm/ttm/ttm_range_manager.h>
+
 #include "amdgpu.h"
 
 struct amdgpu_gtt_node {
-	struct drm_mm_node node;
 	struct ttm_buffer_object *tbo;
+	struct ttm_range_mgr_node base;
 };
 
 static inline struct amdgpu_gtt_mgr *
@@ -38,7 +40,8 @@ to_gtt_mgr(struct ttm_resource_manager *man)
 static inline struct amdgpu_gtt_node *
 to_amdgpu_gtt_node(struct ttm_resource *res)
 {
-	return container_of(res->mm_node, struct amdgpu_gtt_node, node);
+	return container_of(res->mm_node, struct amdgpu_gtt_node,
+			    base.mm_nodes[0]);
 }
 
 /**
@@ -107,7 +110,7 @@ bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *mem)
 {
 	struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(mem);
 
-	return drm_mm_node_allocated(&node->node);
+	return drm_mm_node_allocated(&node->base.mm_nodes[0]);
 }
 
 /**
@@ -138,16 +141,19 @@ static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
 	atomic64_sub(mem->num_pages, &mgr->available);
 	spin_unlock(&mgr->lock);
 
-	node = kzalloc(sizeof(*node), GFP_KERNEL);
+	node = kzalloc(struct_size(node, base.mm_nodes, 1), GFP_KERNEL);
 	if (!node) {
 		r = -ENOMEM;
 		goto err_out;
 	}
 
 	node->tbo = tbo;
+	ttm_resource_init(tbo, place, &node->base.base);
+
 	if (place->lpfn) {
 		spin_lock(&mgr->lock);
-		r = drm_mm_insert_node_in_range(&mgr->mm, &node->node,
+		r = drm_mm_insert_node_in_range(&mgr->mm,
+						&node->base.mm_nodes[0],
 						mem->num_pages,
 						tbo->page_alignment, 0,
 						place->fpfn, place->lpfn,
@@ -156,14 +162,14 @@ static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
 		if (unlikely(r))
 			goto err_free;
 
-		mem->start = node->node.start;
+		mem->start = node->base.mm_nodes[0].start;
 	} else {
-		node->node.start = 0;
-		node->node.size = mem->num_pages;
+		node->base.mm_nodes[0].start = 0;
+		node->base.mm_nodes[0].size = mem->num_pages;
 		mem->start = AMDGPU_BO_INVALID_OFFSET;
 	}
 
-	mem->mm_node = &node->node;
+	mem->mm_node = &node->base.mm_nodes[0];
 	return 0;
 
 err_free:
@@ -186,15 +192,17 @@ static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
 			       struct ttm_resource *mem)
 {
-	struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(mem);
 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
+	struct amdgpu_gtt_node *node;
 
-	if (!node)
+	if (!mem->mm_node)
 		return;
 
+	node = to_amdgpu_gtt_node(mem);
+
 	spin_lock(&mgr->lock);
-	if (drm_mm_node_allocated(&node->node))
-		drm_mm_remove_node(&node->node);
+	if (drm_mm_node_allocated(&node->base.mm_nodes[0]))
+		drm_mm_remove_node(&node->base.mm_nodes[0]);
 	spin_unlock(&mgr->lock);
 	atomic64_add(mem->num_pages, &mgr->available);
 
@@ -232,7 +240,7 @@ int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man)
 
 	spin_lock(&mgr->lock);
 	drm_mm_for_each_node(mm_node, &mgr->mm) {
-		node = container_of(mm_node, struct amdgpu_gtt_node, node);
+		node = container_of(mm_node, typeof(*node), base.mm_nodes[0]);
 		r = amdgpu_ttm_recover_gart(node->tbo);
 		if (r)
 			break;