From: Karol Herbst kherbst@redhat.com
commit 6b04ce966a738ecdd9294c9593e48513c0dc90aa upstream.
It is a bit unlcear to us why that's helping, but it does and unbreaks suspend/resume on a lot of GPUs without any known drawbacks.
Cc: stable@vger.kernel.org # v5.15+ Closes: https://gitlab.freedesktop.org/drm/nouveau/-/issues/156 Signed-off-by: Karol Herbst kherbst@redhat.com Reviewed-by: Lyude Paul lyude@redhat.com Link: https://patchwork.freedesktop.org/patch/msgid/20220819200928.401416-1-kherbs... Cc: Salvatore Bonaccorso carnil@debian.org Cc: Computer Enthusiastic computer.enthusiastic@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/nouveau/nouveau_bo.c | 9 +++++++++ 1 file changed, 9 insertions(+)
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c @@ -823,6 +823,15 @@ nouveau_bo_move_m2mf(struct ttm_buffer_o if (ret == 0) { ret = nouveau_fence_new(chan, false, &fence); if (ret == 0) { + /* TODO: figure out a better solution here + * + * wait on the fence here explicitly as going through + * ttm_bo_move_accel_cleanup somehow doesn't seem to do it. + * + * Without this the operation can timeout and we'll fallback to a + * software copy, which might take several minutes to finish. + */ + nouveau_fence_wait(fence, false, false); ret = ttm_bo_move_accel_cleanup(bo, &fence->base, evict, false,