Re: DMA mapping (was Re: [PATCH] cciss 2.6; replaces DMA masks with kernel defines)

[Lee Revell <rlrevell@joe-job.com>]

On Fri, 2005-06-10 at 22:30 +0100, Matthew Wilcox wrote:
> On Fri, Jun 10, 2005 at 05:17:32PM -0400, Lee Revell wrote:
> > OK, this covers the drivers I know.  I didn't make any attempt to check
> > them all.
> 
> I know of two others ...
> 
> sym2 has:
> #define DMA_DAC_MASK    0x000000ffffffffffULL /* 40-bit */
> 
> and aic7xxx has:
>         const uint64_t   mask_39bit = 0x7FFFFFFFFFULL;

b44 needs 30 bit:

#define B44_DMA_MASK 0x3fffffff

These seem to be all over the place.  I guess it saves a tiny bit of
silicon.  Don't these all violate the PCI spec?

Should I just add everything from 24 to 63?

Lee

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