drm/amdgpu: link all shadow bo V2

V2:
1. use mutex instead of spinlock for shadow list, since its process could
sleep.
2. move list_del to bo destroy phase.
Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -468,6 +468,7 @@ struct amdgpu_bo {
 	struct ttm_bo_kmap_obj		dma_buf_vmap;
 	struct amdgpu_mn		*mn;
 	struct list_head		mn_list;
+	struct list_head		shadow_list;
 };
 #define gem_to_amdgpu_bo(gobj) container_of((gobj), struct amdgpu_bo, gem_base)
 
@@ -2096,6 +2097,10 @@ struct amdgpu_device {
 	struct kfd_dev          *kfd;
 
 	struct amdgpu_virtualization virtualization;
+
+	/* link all shadow bo */
+	struct list_head                shadow_list;
+	struct mutex                    shadow_list_lock;
 };
 
 bool amdgpu_device_is_px(struct drm_device *dev);

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

@@ -1550,6 +1550,9 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 	spin_lock_init(&adev->gc_cac_idx_lock);
 	spin_lock_init(&adev->audio_endpt_idx_lock);
 
+	INIT_LIST_HEAD(&adev->shadow_list);
+	mutex_init(&adev->shadow_list_lock);
+
 	adev->rmmio_base = pci_resource_start(adev->pdev, 5);
 	adev->rmmio_size = pci_resource_len(adev->pdev, 5);
 	adev->rmmio = ioremap(adev->rmmio_base, adev->rmmio_size);

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

@@ -98,6 +98,11 @@ static void amdgpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
 
 	drm_gem_object_release(&bo->gem_base);
 	amdgpu_bo_unref(&bo->parent);
+	if (!list_empty(&bo->shadow_list)) {
+		mutex_lock(&bo->adev->shadow_list_lock);
+		list_del_init(&bo->shadow_list);
+		mutex_unlock(&bo->adev->shadow_list_lock);
+	}
 	kfree(bo->metadata);
 	kfree(bo);
 }
@@ -315,6 +320,7 @@ int amdgpu_bo_create_restricted(struct amdgpu_device *adev,
 	}
 	bo->adev = adev;
 	INIT_LIST_HEAD(&bo->list);
+	INIT_LIST_HEAD(&bo->shadow_list);
 	INIT_LIST_HEAD(&bo->va);
 	bo->prefered_domains = domain & (AMDGPU_GEM_DOMAIN_VRAM |
 					 AMDGPU_GEM_DOMAIN_GTT |
@@ -407,8 +413,12 @@ static int amdgpu_bo_create_shadow(struct amdgpu_device *adev,
 					NULL, &placement,
 					bo->tbo.resv,
 					&bo->shadow);
-	if (!r)
+	if (!r) {
 		bo->shadow->parent = amdgpu_bo_ref(bo);
+		mutex_lock(&adev->shadow_list_lock);
+		list_add_tail(&bo->shadow_list, &adev->shadow_list);
+		mutex_unlock(&adev->shadow_list_lock);
+	}
 
 	return r;
 }