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>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index d5063618efa7..86e3b233b722 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -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;