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

[+cc Arnd]

On Sun, Mar 06, 2016 at 04:17:55PM +0100, Christoph Hellwig wrote:
> For a long time all architectures implement the pci_dma_* functions
> using the generic DMA API, and they all use the same header to do
> so.  This patch moves this header, pci-dma-compat.h, to include/linux
> and includes it from the generic pci.h instead of having each arch
> duplicate this include.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

I applied this to pci/misc for v4.6, thanks!  It could go via another
tree, but it does have minor conflicts with my previous patches that
removed asm-generic/pci-dma-compat.h, so I think it makes sense for me
to take it so I can resolve the conflicts.

I wonder if we can consolidate a little more pci_dma_*-related stuff
in pci-dma-compat.h, e.g.,


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>

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On Mon, Mar 07, 2016 at 12:28:48PM -0600, Bjorn Helgaas wrote:
> I wonder if we can consolidate a little more pci_dma_*-related stuff
> in pci-dma-compat.h, e.g.,

Looks fine to me.
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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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On Tue, Mar 08, 2016 at 11:43:46AM -0600, Bjorn Helgaas wrote:
> I applied the patch below to pci/misc for v4.6.

Btw, where do you keep your tree?

https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/log/?h=pci/misc

hasn't been updated for a month.
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On Tue, Mar 08, 2016 at 06:49:11PM +0100, Christoph Hellwig wrote:
> On Tue, Mar 08, 2016 at 11:43:46AM -0600, Bjorn Helgaas wrote:
> > I applied the patch below to pci/misc for v4.6.
> 
> Btw, where do you keep your tree?
> 
> https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/log/?h=pci/misc
> 
> hasn't been updated for a month.

Sorry, that's the right place; I just hadn't pushed it yet.
Should be there now.  I'll merge it to my "next" branch after the
robot confirms that I haven't broken the build.

Bjorn
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