panthor: use drm_gem_object.gpuva.lock instead of gpuva_list_lock

Now that drm_gem_object has a dedicated mutex for the gpuva list that is
intended to be used in cases that must be fence signalling safe, use it
in Panthor.

Reviewed-by: Boris Brezillon <[e-mail]>
Signed-off-by: Alice Ryhl <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Danilo Krummrich <[e-mail]>

drivers/gpu/drm/panthor/panthor_gem.c

···
 	mutex_destroy(&bo->label.lock);
 
 	drm_gem_free_mmap_offset(&bo->base.base);
-	mutex_destroy(&bo->gpuva_list_lock);
 	drm_gem_shmem_free(&bo->base);
 	drm_gem_object_put(vm_root_gem);
 }
···
 
 	obj->base.base.funcs = &panthor_gem_funcs;
 	obj->base.map_wc = !ptdev->coherent;
-	mutex_init(&obj->gpuva_list_lock);
-	drm_gem_gpuva_set_lock(&obj->base.base, &obj->gpuva_list_lock);
+	drm_gem_gpuva_set_lock(&obj->base.base, &obj->base.base.gpuva.lock);
 	mutex_init(&obj->label.lock);
 
 	panthor_gem_debugfs_bo_init(obj);

drivers/gpu/drm/panthor/panthor_gem.h

···
 	 */
 	struct drm_gem_object *exclusive_vm_root_gem;
 
-	/**
-	 * @gpuva_list_lock: Custom GPUVA lock.
-	 *
-	 * Used to protect insertion of drm_gpuva elements to the
-	 * drm_gem_object.gpuva.list list.
-	 *
-	 * We can't use the GEM resv for that, because drm_gpuva_link() is
-	 * called in a dma-signaling path, where we're not allowed to take
-	 * resv locks.
-	 */
-	struct mutex gpuva_list_lock;
-
 	/** @flags: Combination of drm_panthor_bo_flags flags. */
 	u32 flags;
 

drivers/gpu/drm/panthor/panthor_mmu.c

···
 	 * GEM vm_bo list.
 	 */
 	dma_resv_lock(drm_gpuvm_resv(vm), NULL);
-	mutex_lock(&bo->gpuva_list_lock);
+	mutex_lock(&bo->base.base.gpuva.lock);
 	unpin = drm_gpuvm_bo_put(vm_bo);
-	mutex_unlock(&bo->gpuva_list_lock);
+	mutex_unlock(&bo->base.base.gpuva.lock);
 	dma_resv_unlock(drm_gpuvm_resv(vm));
 
 	/* If the vm_bo object was destroyed, release the pin reference that
···
 	 * calling this function.
 	 */
 	dma_resv_lock(panthor_vm_resv(vm), NULL);
-	mutex_lock(&bo->gpuva_list_lock);
+	mutex_lock(&bo->base.base.gpuva.lock);
 	op_ctx->map.vm_bo = drm_gpuvm_bo_obtain_prealloc(preallocated_vm_bo);
-	mutex_unlock(&bo->gpuva_list_lock);
+	mutex_unlock(&bo->base.base.gpuva.lock);
 	dma_resv_unlock(panthor_vm_resv(vm));
 
 	/* If the a vm_bo for this <VM,BO> combination exists, it already
···
 {
 	struct panthor_gem_object *bo = to_panthor_bo(vma->base.gem.obj);
 
-	mutex_lock(&bo->gpuva_list_lock);
+	mutex_lock(&bo->base.base.gpuva.lock);
 	drm_gpuva_link(&vma->base, vm_bo);
 	drm_WARN_ON(&vm->ptdev->base, drm_gpuvm_bo_put(vm_bo));
-	mutex_unlock(&bo->gpuva_list_lock);
+	mutex_unlock(&bo->base.base.gpuva.lock);
 }
 
 static void panthor_vma_unlink(struct panthor_vm *vm,
···
 	struct panthor_gem_object *bo = to_panthor_bo(vma->base.gem.obj);
 	struct drm_gpuvm_bo *vm_bo = drm_gpuvm_bo_get(vma->base.vm_bo);
 
-	mutex_lock(&bo->gpuva_list_lock);
+	mutex_lock(&bo->base.base.gpuva.lock);
 	drm_gpuva_unlink(&vma->base);
-	mutex_unlock(&bo->gpuva_list_lock);
+	mutex_unlock(&bo->base.base.gpuva.lock);
 
 	/* drm_gpuva_unlink() release the vm_bo, but we manually retained it
 	 * when entering this function, so we can implement deferred VMA