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Commit 3f09ea4e authored by Thomas Hellstrom's avatar Thomas Hellstrom Committed by Dave Airlie
Browse files

drm/ttm: Add a swap_notify callback. 



This is needed for a bugfix in the vmwgfx driver.
Drivers may have GPU bindings on buffers that core TTM is not aware of,
and TTM may view those buffers as ordinary system memory buffers.
Add a notifier to such drivers when TTM is about to move the buffer
contents out to swappable memory. The driver must then release any
private GPU bindings on those buffers.

Signed-off-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent effe1105

drivers/gpu/drm/ttm/ttm_bo.c

+3 −0
Original line number Diff line number Diff line
@@ -1844,6 +1844,9 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink) 
	 * anyone tries to access a ttm page.

	 */



	if (bo->bdev->driver->swap_notify)

		bo->bdev->driver->swap_notify(bo);



	ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);

out:

include/drm/ttm/ttm_bo_driver.h

+5 −0
Original line number Diff line number Diff line
@@ -353,6 +353,11 @@ struct ttm_bo_driver { 
	/* notify the driver we are taking a fault on this BO

	 * and have reserved it */

	void (*fault_reserve_notify)(struct ttm_buffer_object *bo);



	/**

	 * notify the driver that we're about to swap out this bo

	 */

	void (*swap_notify) (struct ttm_buffer_object *bo);

};



/**