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SubjectRe: [RFC/RFT PATCH 4/5] ARM: mm: change max*pfn to include the physical offset of memory
On Wednesday 31 July 2013 06:56 AM, Russell King - ARM Linux wrote:
> On Fri, Jul 12, 2013 at 05:48:13PM -0400, Santosh Shilimkar wrote:
>> diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
>> index 5b579b9..b2d5937 100644
>> --- a/arch/arm/include/asm/dma-mapping.h
>> +++ b/arch/arm/include/asm/dma-mapping.h
>> @@ -47,12 +47,12 @@ static inline int dma_set_mask(struct device *dev, u64 mask)
>> #ifndef __arch_pfn_to_dma
>> static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
>> {
>> - return (dma_addr_t)__pfn_to_bus(pfn);
>> + return (dma_addr_t)__pfn_to_bus(pfn + PHYS_PFN_OFFSET);
>> }
>>
>> static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
>> {
>> - return __bus_to_pfn(addr);
>> + return __bus_to_pfn(addr) - PHYS_PFN_OFFSET;
>> }
>>
>> static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
>> @@ -64,15 +64,16 @@ static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
>> {
>> return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
>> }
>> +
>> #else
>> static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
>> {
>> - return __arch_pfn_to_dma(dev, pfn);
>> + return __arch_pfn_to_dma(dev, pfn + PHYS_PFN_OFFSET);
>> }
>>
>> static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
>> {
>> - return __arch_dma_to_pfn(dev, addr);
>> + return __arch_dma_to_pfn(dev, addr) - PHYS_PFN_OFFSET;
>> }
>>
>> static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
>> @@ -86,6 +87,13 @@ static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
>> }
>> #endif
>
> Note that I don't think the above are correct - the 'pfn' argument to the
> above functions already includes the PFN offset of physical memory -
> they're all physical_address >> PAGE_SHIFT values.
>
Right.
Updated patch pushed into the patch system. (patch 7805/1)

Regards,
Santosh


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