drm/nouveau: if requested, try harder at disabling sysmem pushbufs

On >=nv50, userspace would still end up allocating pushbufs in GART.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_channel.c

@@ -411,6 +411,7 @@ nouveau_ioctl_fifo_alloc(struct drm_device *dev, void *data,
 		return ret;
 	init->channel  = chan->id;
 
+	if (nouveau_vram_pushbuf == 0) {
 		if (chan->dma.ib_max)
 			init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM |
 						NOUVEAU_GEM_DOMAIN_GART;
@@ -418,6 +419,9 @@ nouveau_ioctl_fifo_alloc(struct drm_device *dev, void *data,
 			init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM;
 		else
 			init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_GART;
+	} else {
+		init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM;
+	}
 
 	if (dev_priv->card_type < NV_C0) {
 		init->subchan[0].handle = NvM2MF;