drm: map pages using DMA API

The DMA API is the recommended way to map pages no matter what the
underlying bus is. Use the DMA functions for page mapping and remove
currently existing wrappers.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

4 files changed, 10 insertions, 35 deletions

diff --git a/nvkm/engine/device/base.c b/nvkm/engine/device/base.c
index 466dda2f7..6c16dabe1 100644
--- a/nvkm/engine/device/base.c
+++ b/nvkm/engine/device/base.c
@@ -487,31 +487,6 @@ nv_device_resource_len(struct nouveau_device *device, unsigned int bar)
 	}
 }
 
-dma_addr_t
-nv_device_map_page(struct nouveau_device *device, struct page *page)
-{
-	dma_addr_t ret;
-
-	if (nv_device_is_pci(device)) {
-		ret = pci_map_page(device->pdev, page, 0, PAGE_SIZE,
-				   PCI_DMA_BIDIRECTIONAL);
-		if (pci_dma_mapping_error(device->pdev, ret))
-			ret = 0;
-	} else {
-		ret = page_to_phys(page);
-	}
-
-	return ret;
-}
-
-void
-nv_device_unmap_page(struct nouveau_device *device, dma_addr_t addr)
-{
-	if (nv_device_is_pci(device))
-		pci_unmap_page(device->pdev, addr, PAGE_SIZE,
-			       PCI_DMA_BIDIRECTIONAL);
-}
-
 int
 nv_device_get_irq(struct nouveau_device *device, bool stall)
 {
diff --git a/nvkm/include/core/device.h b/nvkm/include/core/device.h
index 9ce2ee9aa..03c039dcc 100644
--- a/nvkm/include/core/device.h
+++ b/nvkm/include/core/device.h
@@ -174,12 +174,6 @@ nv_device_resource_start(struct nouveau_device *device, unsigned int bar);
 resource_size_t
 nv_device_resource_len(struct nouveau_device *device, unsigned int bar);
 
-dma_addr_t
-nv_device_map_page(struct nouveau_device *device, struct page *page);
-
-void
-nv_device_unmap_page(struct nouveau_device *device, dma_addr_t addr);
-
 int
 nv_device_get_irq(struct nouveau_device *device, bool stall);
 
diff --git a/nvkm/subdev/fb/nv50.c b/nvkm/subdev/fb/nv50.c
index 1fc55c1e9..7d88e17fa 100644
--- a/nvkm/subdev/fb/nv50.c
+++ b/nvkm/subdev/fb/nv50.c
@@ -250,7 +250,9 @@ nv50_fb_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 
 	priv->r100c08_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 	if (priv->r100c08_page) {
-		priv->r100c08 = nv_device_map_page(device, priv->r100c08_page);
+		priv->r100c08 = dma_map_page(nv_device_base(device),
+					     priv->r100c08_page, 0, PAGE_SIZE,
+					     DMA_BIDIRECTIONAL);
 		if (!priv->r100c08)
 			nv_warn(priv, "failed 0x100c08 page map\n");
 	} else {
@@ -268,7 +270,8 @@ nv50_fb_dtor(struct nouveau_object *object)
 	struct nv50_fb_priv *priv = (void *)object;
 
 	if (priv->r100c08_page) {
-		nv_device_unmap_page(device, priv->r100c08);
+		dma_unmap_page(nv_device_base(device), priv->r100c08, PAGE_SIZE,
+			       DMA_BIDIRECTIONAL);
 		__free_page(priv->r100c08_page);
 	}
 
diff --git a/nvkm/subdev/fb/nvc0.c b/nvkm/subdev/fb/nvc0.c
index 0670ae33e..9f5f3ac8d 100644
--- a/nvkm/subdev/fb/nvc0.c
+++ b/nvkm/subdev/fb/nvc0.c
@@ -70,7 +70,8 @@ nvc0_fb_dtor(struct nouveau_object *object)
 	struct nvc0_fb_priv *priv = (void *)object;
 
 	if (priv->r100c10_page) {
-		nv_device_unmap_page(device, priv->r100c10);
+		dma_unmap_page(nv_device_base(device), priv->r100c10, PAGE_SIZE,
+			       DMA_BIDIRECTIONAL);
 		__free_page(priv->r100c10_page);
 	}
 
@@ -93,7 +94,9 @@ nvc0_fb_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 
 	priv->r100c10_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 	if (priv->r100c10_page) {
-		priv->r100c10 = nv_device_map_page(device, priv->r100c10_page);
+		priv->r100c10 = dma_map_page(nv_device_base(device),
+					     priv->r100c10_page, 0, PAGE_SIZE,
+					     DMA_BIDIRECTIONAL);
 		if (!priv->r100c10)
 			return -EFAULT;
 	}