[PATCH v5] drm/nouveau: map pages using DMA API

Daniel Vetter daniel at ffwll.ch
Mon Aug 4 00:32:03 PDT 2014


On Thu, Jul 31, 2014 at 06:09:42PM +0900, Alexandre Courbot wrote:
> 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 at nvidia.com>
> Cc: Daniel Vetter <daniel at ffwll.ch>
> ---
> Changes since v4:
> - Patch against the Nouveau tree instead of the kernel
> - Separated this patch from the rest of the series since it can be
>   merged alone
> - Replaced all pci_map invokations with dma_map. As Daniel pointed
>   out, using the PCI API is deprecated:
> Documentation/DMA-API-HOWTO.txt:
> 
> "Note that the DMA API works with any bus independent of the underlying
> microprocessor architecture. You should use the DMA API rather than the
> bus-specific DMA API, i.e., use the dma_map_*() interfaces rather than the
> pci_map_*() interfaces."
> - As a result, removed the page mapping wrappers which have become
>   unneeded.

Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>

> 
>  drm/nouveau_bo.c           | 22 ++++++++++++++++------
>  lib/core/os.h              |  8 ++++----
>  nvkm/engine/device/base.c  | 25 -------------------------
>  nvkm/include/core/device.h |  6 ------
>  nvkm/subdev/fb/nv50.c      |  7 +++++--
>  nvkm/subdev/fb/nvc0.c      |  7 +++++--
>  6 files changed, 30 insertions(+), 45 deletions(-)
> 
> diff --git a/drm/nouveau_bo.c b/drm/nouveau_bo.c
> index 4db886f9f793..e4f2071c46c3 100644
> --- a/drm/nouveau_bo.c
> +++ b/drm/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);
>  		}
>  	}
>  
> diff --git a/lib/core/os.h b/lib/core/os.h
> index 5f4f04fbff3d..596e083ffb36 100644
> --- a/lib/core/os.h
> +++ b/lib/core/os.h
> @@ -644,7 +644,7 @@ dma_free_coherent(struct device *dev, size_t sz, void *vaddr, dma_addr_t bus)
>   *****************************************************************************/
>  #include <pciaccess.h>
>  
> -#define PCI_DMA_BIDIRECTIONAL 1
> +#define DMA_BIDIRECTIONAL 1
>  
>  #define PCI_CAP_ID_AGP 0x02
>  
> @@ -688,7 +688,7 @@ pci_resource_len(struct pci_dev *pdev, int bar)
>  }
>  
>  static inline dma_addr_t
> -pci_map_page(struct pci_dev *pdev, struct page *page, int offset,
> +dma_map_page(struct device *pdev, struct page *page, int offset,
>  	     int length, unsigned flags)
>  {
>  	return 0;
> @@ -696,13 +696,13 @@ pci_map_page(struct pci_dev *pdev, struct page *page, int offset,
>  
>  
>  static inline bool
> -pci_dma_mapping_error(struct pci_dev *pdev, dma_addr_t addr)
> +dma_mapping_error(struct device *pdev, dma_addr_t addr)
>  {
>  	return true;
>  }
>  
>  static inline void
> -pci_unmap_page(struct pci_dev *pdev, dma_addr_t addr, int size, unsigned flags)
> +dma_unmap_page(struct device *pdev, dma_addr_t addr, int size, unsigned flags)
>  {
>  }
>  
> diff --git a/nvkm/engine/device/base.c b/nvkm/engine/device/base.c
> index 466dda2f7a3a..6c16dabe13b3 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 9ce2ee9aa32e..03c039dcc61f 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 1fc55c1e91a1..7d88e17fa927 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 0670ae33ee45..9f5f3ac8d4c6 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;
>  	}
> -- 
> 2.0.3
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch


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