Re: [PATCH 3/3] pci: move pci_dma_* helpers to common code

[Bjorn Helgaas <helgaas@kernel.org>]

On Mon, Mar 07, 2016 at 12:28:48PM -0600, Bjorn Helgaas wrote:
> commit fe537670eab767157eecc50538bd28e8d9b0ce9f
> Author: Bjorn Helgaas <bhelgaas@google.com>
> Date:   Mon Mar 7 11:39:16 2016 -0600
> 
>     PCI: Consolidate PCI DMA constants and interfaces in linux/pci-dma-compat.h
>     
>     Christoph added a generic include/linux/pci-dma-compat.h, so now there's
>     one place with most of the PCI DMA interfaces.  Move more PCI DMA-related
>     things there:
>     
>       - The PCI_DMA_* direction constants from linux/pci.h
>       - The pci_set_dma_max_seg_size() and pci_set_dma_seg_boundary()
>         CONFIG_PCI implementations from drivers/pci/pci.c
>       - The pci_set_dma_max_seg_size() and pci_set_dma_seg_boundary()
>         !CONFIG_PCI stubs from linux/pci.h
>       - The pci_set_dma_mask() and pci_set_consistent_dma_mask()
>         !CONFIG_PCI stubs from linux/pci.h
>     
>     Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

I applied the patch below to pci/misc for v4.6.

> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 64c0a12..0a9c8db 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -3385,18 +3385,6 @@ bool pci_check_and_unmask_intx(struct pci_dev *dev)
>  }
>  EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx);
>  
> -int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size)
> -{
> -	return dma_set_max_seg_size(&dev->dev, size);
> -}
> -EXPORT_SYMBOL(pci_set_dma_max_seg_size);
> -
> -int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask)
> -{
> -	return dma_set_seg_boundary(&dev->dev, mask);
> -}
> -EXPORT_SYMBOL(pci_set_dma_seg_boundary);
> -
>  /**
>   * pci_wait_for_pending_transaction - waits for pending transaction
>   * @dev: the PCI device to operate on
> diff --git a/include/linux/pci-dma-compat.h b/include/linux/pci-dma-compat.h
> index eafce7b..39726ca 100644
> --- a/include/linux/pci-dma-compat.h
> +++ b/include/linux/pci-dma-compat.h
> @@ -6,6 +6,12 @@
>  
>  #include <linux/dma-mapping.h>
>  
> +/* This defines the direction arg to the DMA mapping routines. */
> +#define PCI_DMA_BIDIRECTIONAL	0
> +#define PCI_DMA_TODEVICE	1
> +#define PCI_DMA_FROMDEVICE	2
> +#define PCI_DMA_NONE		3
> +
>  static inline void *
>  pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
>  		     dma_addr_t *dma_handle)
> @@ -113,6 +119,29 @@ static inline int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
>  {
>  	return dma_set_coherent_mask(&dev->dev, mask);
>  }
> +
> +static inline int pci_set_dma_max_seg_size(struct pci_dev *dev,
> +					   unsigned int size)
> +{
> +	return dma_set_max_seg_size(&dev->dev, size);
> +}
> +
> +static inline int pci_set_dma_seg_boundary(struct pci_dev *dev,
> +					   unsigned long mask)
> +{
> +	return dma_set_seg_boundary(&dev->dev, mask);
> +}
> +#else
> +static inline int pci_set_dma_mask(struct pci_dev *dev, u64 mask)
> +{ return -EIO; }
> +static inline int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
> +{ return -EIO; }
> +static inline int pci_set_dma_max_seg_size(struct pci_dev *dev,
> +					   unsigned int size)
> +{ return -EIO; }
> +static inline int pci_set_dma_seg_boundary(struct pci_dev *dev,
> +					   unsigned long mask)
> +{ return -EIO; }
>  #endif
>  
>  #endif
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 5db6e0c..5049bd6 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -70,12 +70,6 @@ enum pci_mmap_state {
>  	pci_mmap_mem
>  };
>  
> -/* This defines the direction arg to the DMA mapping routines. */
> -#define PCI_DMA_BIDIRECTIONAL	0
> -#define PCI_DMA_TODEVICE	1
> -#define PCI_DMA_FROMDEVICE	2
> -#define PCI_DMA_NONE		3
> -
>  /*
>   *  For PCI devices, the region numbers are assigned this way:
>   */
> @@ -1038,8 +1032,6 @@ void pci_intx(struct pci_dev *dev, int enable);
>  bool pci_intx_mask_supported(struct pci_dev *dev);
>  bool pci_check_and_mask_intx(struct pci_dev *dev);
>  bool pci_check_and_unmask_intx(struct pci_dev *dev);
> -int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size);
> -int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask);
>  int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask);
>  int pci_wait_for_pending_transaction(struct pci_dev *dev);
>  int pcix_get_max_mmrbc(struct pci_dev *dev);
> @@ -1255,6 +1247,7 @@ resource_size_t pcibios_iov_resource_alignment(struct pci_dev *dev, int resno);
>  
>  int pci_set_vga_state(struct pci_dev *pdev, bool decode,
>  		      unsigned int command_bits, u32 flags);
> +
>  /* kmem_cache style wrapper around pci_alloc_consistent() */
>  
>  #include <linux/pci-dma.h>
> @@ -1466,16 +1459,6 @@ static inline struct pci_dev *pci_get_class(unsigned int class,
>  static inline void pci_set_master(struct pci_dev *dev) { }
>  static inline int pci_enable_device(struct pci_dev *dev) { return -EIO; }
>  static inline void pci_disable_device(struct pci_dev *dev) { }
> -static inline int pci_set_dma_mask(struct pci_dev *dev, u64 mask)
> -{ return -EIO; }
> -static inline int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
> -{ return -EIO; }
> -static inline int pci_set_dma_max_seg_size(struct pci_dev *dev,
> -					unsigned int size)
> -{ return -EIO; }
> -static inline int pci_set_dma_seg_boundary(struct pci_dev *dev,
> -					unsigned long mask)
> -{ return -EIO; }
>  static inline int pci_assign_resource(struct pci_dev *dev, int i)
>  { return -EBUSY; }
>  static inline int __pci_register_driver(struct pci_driver *drv,
> --
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