Re: [PATCH] hpsa: SCSI driver for HP Smart Array controllers

[Grant Grundler]

On Fri, Mar 6, 2009 at 6:38 AM,  <scameron@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
...
> The command buffers have to be in the first 4GB of memory, as the command
> register is only 32 bits, so they are allocated by pci_alloc_consistent.

Huh?!!
ISTR the mpt2sas driver is indicating it can handle 64-bit DMA masks for
both streaming and control data. I need to double check to be sure of that.


> However, the chained SG lists don't have that limitation, so I think they
> can be kmalloc'ed, and so not chew up and unreasonable amount of the
> pci_alloc_consistent memory and get a larger number of SGs. Â ...right?
> Maybe that's the better way to do it.

I thought the driver was tracking this and using the appropriate construct
based on which DMA mask is in effect.

hth,
grant

> -- steve
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