linux-kernel - Re: [PATCH 36/56] microblaze

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Date:	Wed, 07 May 2008 08:24:54 +0200
From:	Michal Simek <monstr@...nam.cz>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	John Williams <john.williams@...alogix.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	stephen.neuendorffer@...inx.com, John.Linn@...inx.com,
	matthew@....cx, will.newton@...il.com, drepper@...hat.com,
	microblaze-uclinux@...e.uq.edu.au, grant.likely@...retlab.ca
Subject: Re: [PATCH 36/56] microblaze_v2: dma support


Hi Arnd and Geert,

struct scatterlist {
#ifdef CONFIG_DEBUG_SG
       unsigned long     sg_magic; /* 32 bit */
#endif
       unsigned long     page_link; /* 32 bit */
       dma_addr_t        dma_address; /* 32/64 bit */
       unsigned int      length;  /* 32 bit */
       unsigned int      offset; /* 32 bit */
};

#define sg_dma_address(sg)      ((sg)->dma_address)
#define sg_dma_len(sg)          ((sg)->length)

Is it OK now? This will moved to asm-generic too.

M

>> here is proposed struct.
>>
>> struct scatterlist {
>>       dma_addr_t        dma_address;
>>       unsigned long     page_link;
>> #ifdef CONFIG_DEBUG_SG
>>       unsigned long     sg_magic;
>> #endif
>>       unsigned int      length;
>>       unsigned int      offset;
>> };
>>
>> Is it OK now?
> 
> Everyone else has the sg_magic first, which makes sense for debugging.
> Don't worry about it too much, just use the same code as avr32, h8300,
> blackfin, fvr, mk68knommu, mn10300, sh, v850 and xtensa.
> 
> These are all the same, but I just saw that they also have
> 
> #define sg_dma_address(sg)      ((sg)->dma_address)
> #define sg_dma_len(sg)          ((sg)->length)
> 
> which you probably want as well.
> 
> 	Arnd <><
> 
> 
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