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drm/ttm: Make sure BOs being swapped out are cacheable 

The current caching state may not be tt_cached, even though the
placement contains TTM_PL_FLAG_CACHED, because placement can contain
multiple caching flags. Trying to swap out such a BO would trip up the

	BUG_ON(ttm->caching_state != tt_cached);

in ttm_tt_swapout.

Cc: stable@vger.kernel.org
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Christian König <christian.koenig@amd.com>.
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Michel Dänzer 2017-01-25 17:21:31 +09:00 committed by Christian König
parent ba0c6d0087
commit 239ac65fa5
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/ttm/ttm_bo.c
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@ -1670,7 +1670,6 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
struct ttm_buffer_object *bo;
int ret = -EBUSY;
int put_count;
uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
spin_lock(&glob->lru_lock);
list_for_each_entry(bo, &glob->swap_lru, swap) {
@ -1701,7 +1700,8 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
* Move to system cached
*/
if ((bo->mem.placement & swap_placement) != swap_placement) {
if (bo->mem.mem_type != TTM_PL_SYSTEM ||
bo->ttm->caching_state != tt_cached) {
struct ttm_mem_reg evict_mem;
evict_mem = bo->mem;