drm/ttm: add ttm_resource_fini v2

Make sure we call the common cleanup function in all
implementations of the resource manager.

v2: fix missing case in i915, rudimentary kerneldoc, should be
    filled in more when we add more functionality

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220124122514.1832-2-christian.koenig@amd.com

Author: ChristianKoenigAMD

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

@@ -169,6 +169,7 @@ static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
 	return 0;
 
 err_free:
+	ttm_resource_fini(man, &node->base.base);
 	kfree(node);
 
 err_out:
@@ -200,6 +201,7 @@ static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
 	if (!(res->placement & TTM_PL_FLAG_TEMPORARY))
 		atomic64_sub(res->num_pages, &mgr->used);
 
+	ttm_resource_fini(man, res);
 	kfree(node);
 }
 

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

@@ -95,6 +95,7 @@ static void amdgpu_preempt_mgr_del(struct ttm_resource_manager *man,
 	struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
 
 	atomic64_sub(res->num_pages, &mgr->used);
+	ttm_resource_fini(man, res);
 	kfree(res);
 }
 

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

@@ -476,6 +476,7 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
 	while (i--)
 		drm_mm_remove_node(&node->mm_nodes[i]);
 	spin_unlock(&mgr->lock);
+	ttm_resource_fini(man, &node->base);
 	kvfree(node);
 
 error_sub:
@@ -515,6 +516,7 @@ static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man,
 	atomic64_sub(usage, &mgr->usage);
 	atomic64_sub(vis_usage, &mgr->vis_usage);
 
+	ttm_resource_fini(man, res);
 	kvfree(node);
 }
 

drivers/gpu/drm/i915/i915_ttm_buddy_manager.c

@@ -110,6 +110,7 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
 	drm_buddy_free_list(mm, &bman_res->blocks);
 	mutex_unlock(&bman->lock);
 err_free_res:
+	ttm_resource_fini(man, &bman_res->base);
 	kfree(bman_res);
 	return err;
 }
@@ -124,6 +125,7 @@ static void i915_ttm_buddy_man_free(struct ttm_resource_manager *man,
 	drm_buddy_free_list(&bman->mm, &bman_res->blocks);
 	mutex_unlock(&bman->lock);
 
+	ttm_resource_fini(man, res);
 	kfree(bman_res);
 }
 

drivers/gpu/drm/nouveau/nouveau_mem.c

@@ -162,11 +162,12 @@ nouveau_mem_vram(struct ttm_resource *reg, bool contig, u8 page)
 }
 
 void
-nouveau_mem_del(struct ttm_resource *reg)
+nouveau_mem_del(struct ttm_resource_manager *man, struct ttm_resource *reg)
 {
 	struct nouveau_mem *mem = nouveau_mem(reg);
 
 	nouveau_mem_fini(mem);
+	ttm_resource_fini(man, reg);
 	kfree(mem);
 }
 

drivers/gpu/drm/nouveau/nouveau_mem.h

@@ -23,7 +23,8 @@ nouveau_mem(struct ttm_resource *reg)
 
 int nouveau_mem_new(struct nouveau_cli *, u8 kind, u8 comp,
 		    struct ttm_resource **);
-void nouveau_mem_del(struct ttm_resource *);
+void nouveau_mem_del(struct ttm_resource_manager *man,
+		     struct ttm_resource *);
 int nouveau_mem_vram(struct ttm_resource *, bool contig, u8 page);
 int nouveau_mem_host(struct ttm_resource *, struct ttm_tt *);
 void nouveau_mem_fini(struct nouveau_mem *);

drivers/gpu/drm/nouveau/nouveau_ttm.c

@@ -36,9 +36,10 @@
 #include <core/tegra.h>
 
 static void
-nouveau_manager_del(struct ttm_resource_manager *man, struct ttm_resource *reg)
+nouveau_manager_del(struct ttm_resource_manager *man,
+		    struct ttm_resource *reg)
 {
-	nouveau_mem_del(reg);
+	nouveau_mem_del(man, reg);
 }
 
 static int
@@ -62,7 +63,7 @@ nouveau_vram_manager_new(struct ttm_resource_manager *man,
 
 	ret = nouveau_mem_vram(*res, nvbo->contig, nvbo->page);
 	if (ret) {
-		nouveau_mem_del(*res);
+		nouveau_mem_del(man, *res);
 		return ret;
 	}
 
@@ -118,7 +119,7 @@ nv04_gart_manager_new(struct ttm_resource_manager *man,
 	ret = nvif_vmm_get(&mem->cli->vmm.vmm, PTES, false, 12, 0,
 			   (long)(*res)->num_pages << PAGE_SHIFT, &mem->vma[0]);
 	if (ret) {
-		nouveau_mem_del(*res);
+		nouveau_mem_del(man, *res);
 		return ret;
 	}
 

drivers/gpu/drm/ttm/ttm_range_manager.c

@@ -89,6 +89,7 @@ static int ttm_range_man_alloc(struct ttm_resource_manager *man,
 	spin_unlock(&rman->lock);
 
 	if (unlikely(ret)) {
+		ttm_resource_fini(man, *res);
 		kfree(node);
 		return ret;
 	}
@@ -108,6 +109,7 @@ static void ttm_range_man_free(struct ttm_resource_manager *man,
 	drm_mm_remove_node(&node->mm_nodes[0]);
 	spin_unlock(&rman->lock);
 
+	ttm_resource_fini(man, res);
 	kfree(node);
 }
 

drivers/gpu/drm/ttm/ttm_resource.c

@@ -29,6 +29,14 @@
 #include <drm/ttm/ttm_resource.h>
 #include <drm/ttm/ttm_bo_driver.h>
 
+/**
+ * ttm_resource_init - resource object constructure
+ * @bo: buffer object this resources is allocated for
+ * @place: placement of the resource
+ * @res: the resource object to inistilize
+ *
+ * Initialize a new resource object. Counterpart of &ttm_resource_fini.
+ */
 void ttm_resource_init(struct ttm_buffer_object *bo,
                        const struct ttm_place *place,
                        struct ttm_resource *res)
@@ -44,6 +52,21 @@ void ttm_resource_init(struct ttm_buffer_object *bo,
 }
 EXPORT_SYMBOL(ttm_resource_init);
 
+/**
+ * ttm_resource_fini - resource destructor
+ * @man: the resource manager this resource belongs to
+ * @res: the resource to clean up
+ *
+ * Should be used by resource manager backends to clean up the TTM resource
+ * objects before freeing the underlying structure. Counterpart of
+ * &ttm_resource_init
+ */
+void ttm_resource_fini(struct ttm_resource_manager *man,
+		       struct ttm_resource *res)
+{
+}
+EXPORT_SYMBOL(ttm_resource_fini);
+
 int ttm_resource_alloc(struct ttm_buffer_object *bo,
 		       const struct ttm_place *place,
 		       struct ttm_resource **res_ptr)

drivers/gpu/drm/ttm/ttm_sys_manager.c

@@ -23,6 +23,7 @@ static int ttm_sys_man_alloc(struct ttm_resource_manager *man,
 static void ttm_sys_man_free(struct ttm_resource_manager *man,
 			     struct ttm_resource *res)
 {
+	ttm_resource_fini(man, res);
 	kfree(res);
 }