linux-kernel - Re: [RFC/RFT PATCH 4/5] ARM: mm: change max*pfn to include the physical offset of memory

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Date:	Wed, 31 Jul 2013 22:14:41 -0400
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>
Subject: Re: [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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