From 274840e544225657fbca4f12efa1ee55474bb800 Mon Sep 17 00:00:00 2001
From: Felix Kuehling <Felix.Kuehling@amd.com>
Date: Tue, 9 Jul 2019 19:09:42 -0400
Subject: drm/ttm: Add release_notify callback to ttm_bo_driver
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Git-commit: 274840e544225657fbca4f12efa1ee55474bb800
Patch-mainline: v5.4-rc1
References: bsc#1152489

This notifies the driver that a BO is about to be released.

Releasing a BO also invokes the move_notify callback from
ttm_bo_cleanup_memtype_use, but that happens too late for anything
that would add fences to the BO and require a delayed delete.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/ttm/ttm_bo.c    |    3 +++
 include/drm/ttm/ttm_bo_driver.h |   10 ++++++++++
 2 files changed, 13 insertions(+)

--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -672,6 +672,9 @@ static void ttm_bo_release(struct kref *
 	struct ttm_bo_device *bdev = bo->bdev;
 	struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 
+	if (bo->bdev->driver->release_notify)
+		bo->bdev->driver->release_notify(bo);
+
 	drm_vma_offset_remove(&bdev->vma_manager, &bo->base.vma_node);
 	ttm_mem_io_lock(man, false);
 	ttm_mem_io_free_vm(bo);
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -390,6 +390,16 @@ struct ttm_bo_driver {
 	 * notify driver that a BO was deleted from LRU.
 	 */
 	void (*del_from_lru_notify)(struct ttm_buffer_object *bo);
+
+	/**
+	 * Notify the driver that we're about to release a BO
+	 *
+	 * @bo: BO that is about to be released
+	 *
+	 * Gives the driver a chance to do any cleanup, including
+	 * adding fences that may force a delayed delete
+	 */
+	void (*release_notify)(struct ttm_buffer_object *bo);
 };
 
 /**