From: Grant Grundler <grundler@google.com>
To: scameron@beardog.cca.cpqcorp.net
Cc: Jens Axboe <jens.axboe@oracle.com>,
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
linux-kernel@vger.kernel.org, mike.miller@hp.com,
akpm@linux-foundation.org, linux-scsi@vger.kernel.org,
coldwell@redhat.com, hare@novell.com, iss_storagedev@hp.com
Subject: Re: [PATCH] hpsa: SCSI driver for HP Smart Array controllers
Date: Fri, 6 Mar 2009 12:59:48 -0800 [thread overview]
Message-ID: <da824cf30903061259j4a37ab7cneea308c736da469d@mail.gmail.com> (raw)
In-Reply-To: <20090306143856.GT15340@beardog.cca.cpqcorp.net>
On Fri, Mar 6, 2009 at 6:38 AM, <scameron@beardog.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
> --
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
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next prev parent reply other threads:[~2009-03-06 21:00 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-02 14:56 scameron
2009-03-03 6:35 ` FUJITA Tomonori
2009-03-03 16:28 ` scameron
2009-03-05 5:48 ` FUJITA Tomonori
2009-03-05 14:21 ` scameron
2009-03-05 16:54 ` Andrew Patterson
2009-03-06 8:55 ` Jens Axboe
2009-03-06 9:13 ` FUJITA Tomonori
2009-03-06 9:21 ` Jens Axboe
2009-03-06 9:27 ` FUJITA Tomonori
2009-03-06 9:35 ` Jens Axboe
2009-03-06 14:38 ` scameron
2009-03-06 19:06 ` Jens Axboe
2009-03-06 20:59 ` Grant Grundler [this message]
2009-03-06 21:18 ` scameron
2009-03-06 21:55 ` Grant Grundler
2009-03-06 21:59 ` James Bottomley
2009-03-05 14:55 ` Miller, Mike (OS Dev)
2009-03-03 16:49 ` Mike Christie
2009-03-03 21:28 ` scameron
-- strict thread matches above, loose matches on Subject: below --
2009-02-27 23:09 Mike Miller
2009-03-01 13:49 ` Rolf Eike Beer
2009-03-02 6:32 ` FUJITA Tomonori
2009-03-02 17:19 ` Grant Grundler
2009-03-02 18:20 ` Mike Christie
2009-03-02 18:36 ` Jens Axboe
2009-03-02 20:33 ` Mike Christie
2009-03-02 20:37 ` Mike Christie
2009-03-03 9:43 ` Jens Axboe
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