Re: [PATCH 2/6] staging: vme: make [alloc|free]_consistent bridgespecific

[Martyn Welch]

On 10/08/11 14:51, Joe Perches wrote:
> On Wed, 2011-08-10 at 14:34 +0100, Martyn Welch wrote:
>> On 10/08/11 14:12, Joe Perches wrote:
>>> On Wed, 2011-08-10 at 11:33 +0200, Manohar Vanga wrote:
>>>> Make PCI dependent functions ([alloc|free]_consistent() in
>>>> 'vme.c') bridge specific. By removing the dependency of the
>>>> VME bridge framework on PCI, this patch allows for addition of
>>>> non-PCI based VME bridges.
>>> []
>>>> diff --git a/drivers/staging/vme/bridges/vme_ca91cx42.c b/drivers/staging/vme/bridges/vme_ca91cx42.c
>>> []
>>>> +void *ca91cx42_alloc_consistent(struct device *parent, size_t size,
>>>> +	dma_addr_t *dma)
>>>> +{
>>>> +	struct pci_dev *pdev;
>>>> +
>>>> +	/* Find pci_dev container of dev */
>>>> +	pdev = container_of(parent, struct pci_dev, dev);
>>>> +
>>>> +	return pci_alloc_consistent(pdev, size, dma);
>>>> +}
>>>> +
>>>> +void ca91cx42_free_consistent(struct device *parent, size_t size, void *vaddr,
>>>> +	dma_addr_t dma)
>>>> +{
>>>> +	struct pci_dev *pdev;
>>>> +
>>>> +	/* Find pci_dev container of dev */
>>>> +	pdev = container_of(parent, struct pci_dev, dev);
>>>> +
>>>> +	pci_free_consistent(pdev, size, vaddr, dma);
>>>> +}
>>> []
>>>> diff --git a/drivers/staging/vme/bridges/vme_tsi148.c b/drivers/staging/vme/bridges/vme_tsi148.c
>>> []
>>>> @@ -2122,6 +2122,28 @@ static int tsi148_slot_get(struct vme_bridge *tsi148_bridge)
>>>>  	return (int)slot;
>>>>  }
>>>>  
>>>> +void *tsi148_alloc_consistent(struct device *parent, size_t size,
>>>> +	dma_addr_t *dma)
>>>> +{
>>>> +	struct pci_dev *pdev;
>>>> +
>>>> +	/* Find pci_dev container of dev */
>>>> +	pdev = container_of(parent, struct pci_dev, dev);
>>>> +
>>>> +	return pci_alloc_consistent(pdev, size, dma);
>>>> +}
>>>> +
>>>> +void tsi148_free_consistent(struct device *parent, size_t size, void *vaddr,
>>>> +	dma_addr_t dma)
>>>> +{
>>>> +	struct pci_dev *pdev;
>>>> +
>>>> +	/* Find pci_dev container of dev */
>>>> +	pdev = container_of(parent, struct pci_dev, dev);
>>>> +
>>>> +	pci_free_consistent(pdev, size, vaddr, dma);
>>>> +}
>>>> +
>>>>  static int __init tsi148_init(void)
>>>>  {
>>>>  	return pci_register_driver(&tsi148_driver);
>>>
>>> Except for the name, those 2 blocks are identical.
>>> Maybe create a non-pci generic version instead?
>>>
>>
>> I'm not sure you can (I spent quite a bit of time attempting to do just that
>> when I wrote the original). It just so happens that both of the bridges we
>> have at the moment are PCI devices,
> 
> Doesn't something like this work?
> 
> void *generic_vme_pci_alloc_consistent(struct device *parent, size_t size,
> 				       dma_addr_t *dma)
> [implementation...]
> EXPORT_SYMBOL(generic_vme_pci_alloc_consistent);
> (if necessary)
> 
> void *generic_vme_pci_free_consistent(struct device *parent, size_t size,
> 				      void *vaddr, dma_addr_t dma)
> [implementation...]
> EXPORT_SYMBOL(generic_vme_pci_free_consistent);
> 
> and uses like:
> 
> +       ca91cx42_bridge->alloc_consistent = generic_vme_pci_alloc_consistent;
> +       ca91cx42_bridge->free_consistent = generic_vme_pci_free_consistent;
> 
> ?
> 

Could. Though we'd have to put this in a new common file for use by
vme_tsi148.c and vme_ca91cx42.c as the point of this was to get it out of the
VME core code. I'm just not sure that it's worth it.

Martyn

-- 
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