drm/ttm: Use init_on_free to delay release TTM BOs

Delay release TTM BOs when the kernel default setting is init_on_free.
This offloads the overhead of clearing the system memory to the work
item and potentially a different CPU. This could be very beneficial when
the application does a lot of malloc/free style allocations of system
memory.

Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>.
Link: https://patchwork.freedesktop.org/patch/msgid/20230708011355.853-1-rajneesh.bhardwaj@amd.com
Signed-off-by: Christian König <christian.koenig@amd.com>

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 615d30c..758f980 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -345,6 +345,7 @@ static void ttm_bo_release(struct kref *kref)
 
                if (!dma_resv_test_signaled(bo->base.resv,
                                            DMA_RESV_USAGE_BOOKKEEP) ||
+                   (want_init_on_free() && (bo->ttm != NULL)) ||
                    !dma_resv_trylock(bo->base.resv)) {
                        /* The BO is not idle, resurrect it for delayed destroy */
                        ttm_bo_flush_all_fences(bo);