drm/nouveau: 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>

5 files changed, 26 insertions, 41 deletions

diff --git a/drivers/gpu/drm/nouveau/core/engine/device/base.c b/drivers/gpu/drm/nouveau/core/engine/device/base.c
index 466dda2..6c16dab 100644
--- a/drivers/gpu/drm/nouveau/core/engine/device/base.c
+++ b/drivers/gpu/drm/nouveau/core/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/drivers/gpu/drm/nouveau/core/include/core/device.h b/drivers/gpu/drm/nouveau/core/include/core/device.h
index 9ce2ee9..03c039d 100644
--- a/drivers/gpu/drm/nouveau/core/include/core/device.h
+++ b/drivers/gpu/drm/nouveau/core/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/drivers/gpu/drm/nouveau/core/subdev/fb/nv50.c b/drivers/gpu/drm/nouveau/core/subdev/fb/nv50.c
index 1fc55c1..7d88e17 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/fb/nv50.c
+++ b/drivers/gpu/drm/nouveau/core/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/drivers/gpu/drm/nouveau/core/subdev/fb/nvc0.c b/drivers/gpu/drm/nouveau/core/subdev/fb/nvc0.c
index 0670ae3..9f5f3ac 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/fb/nvc0.c
+++ b/drivers/gpu/drm/nouveau/core/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;
 	}
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index d349078..a405b75 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1340,6 +1340,7 @@ nouveau_ttm_tt_populate(struct ttm_tt *ttm)
 	struct nouveau_drm *drm;
 	struct nouveau_device *device;
 	struct drm_device *dev;
+	struct device *pdev;
 	unsigned i;
 	int r;
 	bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
@@ -1358,6 +1359,7 @@ nouveau_ttm_tt_populate(struct ttm_tt *ttm)
 	drm = nouveau_bdev(ttm->bdev);
 	device = nv_device(drm->device);
 	dev = drm->dev;
+	pdev = nv_device_base(device);
 
 #if __OS_HAS_AGP
 	if (drm->agp.stat == ENABLED) {
@@ -1377,17 +1379,22 @@ nouveau_ttm_tt_populate(struct ttm_tt *ttm)
 	}
 
 	for (i = 0; i < ttm->num_pages; i++) {
-		ttm_dma->dma_address[i] = nv_device_map_page(device,
-							     ttm->pages[i]);
-		if (!ttm_dma->dma_address[i]) {
+		dma_addr_t addr;
+
+		addr = dma_map_page(pdev, ttm->pages[i], 0, PAGE_SIZE,
+				    DMA_BIDIRECTIONAL);
+
+		if (dma_mapping_error(pdev, addr)) {
 			while (--i) {
-				nv_device_unmap_page(device,
-						     ttm_dma->dma_address[i]);
+				dma_unmap_page(pdev, ttm_dma->dma_address[i],
+					       PAGE_SIZE, DMA_BIDIRECTIONAL);
 				ttm_dma->dma_address[i] = 0;
 			}
 			ttm_pool_unpopulate(ttm);
 			return -EFAULT;
 		}
+
+		ttm_dma->dma_address[i] = addr;
 	}
 	return 0;
 }
@@ -1399,6 +1406,7 @@ nouveau_ttm_tt_unpopulate(struct ttm_tt *ttm)
 	struct nouveau_drm *drm;
 	struct nouveau_device *device;
 	struct drm_device *dev;
+	struct device *pdev;
 	unsigned i;
 	bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
 
@@ -1408,6 +1416,7 @@ nouveau_ttm_tt_unpopulate(struct ttm_tt *ttm)
 	drm = nouveau_bdev(ttm->bdev);
 	device = nv_device(drm->device);
 	dev = drm->dev;
+	pdev = nv_device_base(device);
 
 #if __OS_HAS_AGP
 	if (drm->agp.stat == ENABLED) {
@@ -1425,7 +1434,8 @@ nouveau_ttm_tt_unpopulate(struct ttm_tt *ttm)
 
 	for (i = 0; i < ttm->num_pages; i++) {
 		if (ttm_dma->dma_address[i]) {
-			nv_device_unmap_page(device, ttm_dma->dma_address[i]);
+			dma_unmap_page(pdev, ttm_dma->dma_address[i], PAGE_SIZE,
+				       DMA_BIDIRECTIONAL);
 		}
 	}