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drm/ttm: Add a swap_notify callback.

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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: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thomas Hellstrom 2010-01-13 22:28:40 +01:00 committed by Dave Airlie
parent effe1105be
commit 3f09ea4ecd
2 changed files with 8 additions and 0 deletions
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3
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -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:

5
include/drm/ttm/ttm_bo_driver.h
View File

@ -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);
};
/**