drm/nv04-nv40: Fix up PCI(E) GART DMA object bus address calculation.

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_drv.h

@@ -934,8 +934,8 @@ extern void        nouveau_irq_uninstall(struct drm_device *);
 /* nouveau_sgdma.c */
 extern int nouveau_sgdma_init(struct drm_device *);
 extern void nouveau_sgdma_takedown(struct drm_device *);
-extern int nouveau_sgdma_get_page(struct drm_device *, uint32_t offset,
-				  uint32_t *page);
+extern uint32_t nouveau_sgdma_get_physical(struct drm_device *,
+					   uint32_t offset);
 extern struct ttm_backend *nouveau_sgdma_init_ttm(struct drm_device *);
 
 /* nouveau_debugfs.c */

drivers/gpu/drm/nouveau/nouveau_object.c

@@ -478,7 +478,7 @@ nouveau_gpuobj_dma_new(struct nouveau_channel *chan, int class, u64 base,
 	struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
 	struct drm_device *dev = chan->dev;
 	struct nouveau_gpuobj *obj;
-	u32 page_addr, flags0, flags2;
+	u32 flags0, flags2;
 	int ret;
 
 	if (dev_priv->card_type >= NV_50) {
@@ -495,12 +495,8 @@ nouveau_gpuobj_dma_new(struct nouveau_channel *chan, int class, u64 base,
 			base  += dev_priv->gart_info.aper_base;
 		} else
 		if (base != 0) {
-			ret = nouveau_sgdma_get_page(dev, base, &page_addr);
-			if (ret)
-				return ret;
-
+			base = nouveau_sgdma_get_physical(dev, base);
 			target = NV_MEM_TARGET_PCI;
-			base   = page_addr;
 		} else {
 			nouveau_gpuobj_ref(dev_priv->gart_info.sg_ctxdma, pobj);
 			return 0;

drivers/gpu/drm/nouveau/nouveau_sgdma.c

@@ -267,19 +267,15 @@ nouveau_sgdma_takedown(struct drm_device *dev)
 	nouveau_vm_put(&dev_priv->gart_info.vma);
 }
 
-int
-nouveau_sgdma_get_page(struct drm_device *dev, uint32_t offset, uint32_t *page)
+uint32_t
+nouveau_sgdma_get_physical(struct drm_device *dev, uint32_t offset)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
-	int pte;
+	int pte = (offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
 
-	pte = (offset >> NV_CTXDMA_PAGE_SHIFT) << 2;
-	if (dev_priv->card_type < NV_50) {
-		*page = nv_ro32(gpuobj, (pte + 8)) & ~NV_CTXDMA_PAGE_MASK;
-		return 0;
-	}
+	BUG_ON(dev_priv->card_type >= NV_50);
 
-	NV_ERROR(dev, "Unimplemented on NV50\n");
-	return -EINVAL;
+	return (nv_ro32(gpuobj, 4 * pte) & ~NV_CTXDMA_PAGE_MASK) |
+		(offset & NV_CTXDMA_PAGE_MASK);
 }