drm/nvc0: implement fencing

Just simple REF_CNT fencing for the moment.

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

diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index 374a979..88b2f29 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -32,7 +32,8 @@
 #include "nouveau_dma.h"
 
 #define USE_REFCNT(dev) (nouveau_private(dev)->chipset >= 0x10)
-#define USE_SEMA(dev) (nouveau_private(dev)->chipset >= 0x17)
+#define USE_SEMA(dev) (nouveau_private(dev)->chipset >= 0x17 && \
+                      nouveau_private(dev)->card_type < NV_C0)
 
 struct nouveau_fence {
        struct nouveau_channel *channel;
@@ -139,6 +140,7 @@ nouveau_fence_emit(struct nouveau_fence *fence)
 {
        struct nouveau_channel *chan = fence->channel;
        struct drm_device *dev = chan->dev;
+       struct drm_nouveau_private *dev_priv = dev->dev_private;
        int ret;
 
        ret = RING_SPACE(chan, 2);
@@ -159,8 +161,15 @@ nouveau_fence_emit(struct nouveau_fence *fence)
        list_add_tail(&fence->entry, &chan->fence.pending);
        spin_unlock(&chan->fence.lock);
 
-       BEGIN_RING(chan, NvSubSw, USE_REFCNT(dev) ? 0x0050 : 0x0150, 1);
-       OUT_RING(chan, fence->sequence);
+       if (USE_REFCNT(dev)) {
+               if (dev_priv->card_type < NV_C0)
+                       BEGIN_RING(chan, NvSubSw, 0x0050, 1);
+               else
+                       BEGIN_NVC0(chan, 2, NvSubSw, 0x0050, 1);
+       } else {
+               BEGIN_RING(chan, NvSubSw, 0x0150, 1);
+       }
+       OUT_RING (chan, fence->sequence);
        FIRE_RING(chan);
 
        return 0;
@@ -445,11 +454,14 @@ nouveau_fence_channel_init(struct nouveau_channel *chan)
        if (ret)
                return ret;
 
-       ret = RING_SPACE(chan, 2);
-       if (ret)
-               return ret;
-       BEGIN_RING(chan, NvSubSw, 0, 1);
-       OUT_RING(chan, NvSw);
+       /* we leave subchannel empty for nvc0 */
+       if (dev_priv->card_type < NV_C0) {
+               ret = RING_SPACE(chan, 2);
+               if (ret)
+                       return ret;
+               BEGIN_RING(chan, NvSubSw, 0, 1);
+               OUT_RING(chan, NvSw);
+       }
 
        /* Create a DMA object for the shared cross-channel sync area. */
        if (USE_SEMA(dev)) {