drm/nouveau: create grctx on the fly on all chipsets

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_channel.c

@@ -121,7 +121,6 @@ nouveau_channel_alloc(struct drm_device *dev, struct nouveau_channel **chan_ret,
 		      uint32_t vram_handle, uint32_t gart_handle)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
-	struct nouveau_pgraph_engine *pgraph = &dev_priv->engine.graph;
 	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
 	struct nouveau_channel *chan;
 	unsigned long flags;
@@ -202,15 +201,6 @@ nouveau_channel_alloc(struct drm_device *dev, struct nouveau_channel **chan_ret,
 	/* disable the fifo caches */
 	pfifo->reassign(dev, false);
 
-	/* Create a graphics context for new channel */
-	if (dev_priv->card_type < NV_50) {
-		ret = pgraph->create_context(chan);
-		if (ret) {
-			nouveau_channel_put(&chan);
-			return ret;
-		}
-	}
-
 	/* Construct inital RAMFC for new channel */
 	ret = pfifo->create_context(chan);
 	if (ret) {

drivers/gpu/drm/nouveau/nouveau_object.c

@@ -651,7 +651,8 @@ nouveau_gpuobj_gr_new(struct nouveau_channel *chan, u32 handle, int class)
 		}
 		break;
 	case NVOBJ_ENGINE_GR:
-		if (dev_priv->card_type >= NV_50 && !chan->ramin_grctx) {
+		if ((dev_priv->card_type >= NV_20 && !chan->ramin_grctx) ||
+		    (dev_priv->card_type  < NV_20 && !chan->pgraph_ctx)) {
 			struct nouveau_pgraph_engine *pgraph =
 				&dev_priv->engine.graph;
 

drivers/gpu/drm/nouveau/nv40_fifo.c

@@ -64,7 +64,6 @@ nv40_fifo_create_context(struct nouveau_channel *chan)
 			      NV_PFIFO_CACHE1_BIG_ENDIAN |
 #endif
 			      0x30000000 /* no idea.. */);
-	nv_wi32(dev, fc + 56, chan->ramin_grctx->pinst >> 4);
 	nv_wi32(dev, fc + 60, 0x0001FFFF);
 
 	/* enable the fifo dma operation */

drivers/gpu/drm/nouveau/nv40_graph.c

@@ -62,6 +62,7 @@ nv40_graph_create_context(struct nouveau_channel *chan)
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_pgraph_engine *pgraph = &dev_priv->engine.graph;
 	struct nouveau_grctx ctx = {};
+	unsigned long flags;
 	int ret;
 
 	ret = nouveau_gpuobj_new(dev, chan, pgraph->grctx_size, 16,
@@ -76,6 +77,17 @@ nv40_graph_create_context(struct nouveau_channel *chan)
 	nv40_grctx_init(&ctx);
 
 	nv_wo32(chan->ramin_grctx, 0, chan->ramin_grctx->pinst);
+
+	/* init grctx pointer in ramfc, and on PFIFO if channel is
+	 * already active there
+	 */
+	spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
+	nv_wo32(chan->ramfc, 0x38, chan->ramin_grctx->pinst >> 4);
+	nv_mask(dev, 0x002500, 0x00000001, 0x00000000);
+	if ((nv_rd32(dev, 0x003204) & 0x0000001f) == chan->id)
+		nv_wr32(dev, 0x0032e0, chan->ramin_grctx->pinst >> 4);
+	nv_mask(dev, 0x002500, 0x00000001, 0x00000001);
+	spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
 	return 0;
 }