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

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Message-ID: <da824cf30903061259j4a37ab7cneea308c736da469d@mail.gmail.com>
Date:	Fri, 6 Mar 2009 12:59:48 -0800
From:	Grant Grundler <grundler@...gle.com>
To:	scameron@...rdog.cca.cpqcorp.net
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, mike.miller@...com,
	akpm@...ux-foundation.org, linux-scsi@...r.kernel.org,
	coldwell@...hat.com, hare@...ell.com, iss_storagedev@...com
Subject: Re: [PATCH] hpsa: SCSI driver for HP Smart Array controllers

On Fri, Mar 6, 2009 at 6:38 AM,  <scameron@...rdog.cca.cpqcorp.net> 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.   ...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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