From: Jeff Garzik <jgarzik@pobox.com>
To: Tejun Heo <htejun@gmail.com>
Cc: Alan <alan@lxorguk.ukuu.org.uk>, David Shirley <tephra@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: SATA DMA problem (sata_uli)
Date: Tue, 19 Dec 2006 19:39:47 -0500 [thread overview]
Message-ID: <45888653.6080702@pobox.com> (raw)
In-Reply-To: <458884B2.9080802@gmail.com>
Tejun Heo wrote:
> Jeff Garzik wrote:
>> Alan wrote:
>>>> I tracked it down to one of the drives being forced into PIO4 mode
>>>> rather than UDMA mode; dmesg bits:
>>>> ata4.00: ATA-7, max UDMA/133, 586072368 sectors: LBA48 NCQ (depth 0/32)
>>>> ata4.00: ata4: dev 0 multi count 16
>>>> ata4.00: simplex DMA is claimed by other device, disabling DMA
>>> Your ULi controller is reporting that it supports UDMA upon only one
>>> channel at a time. The kernel is honouring this information. The older
>>> ULi (was ALi) PATA devices report simplex but let you turn it off so
>>> see if the following does the trick. Test carefully as always with
>>> disk driver
>>> changes.
>>>
>>> (Jeff probably best to check the docs before merging this but I believe
>>> it is sane)
>>>
>>> Signed-off-by: Alan Cox <alan@redhat.com>
>> My Uli SATA docs do not appear to cover the bmdma registers :( Only the
>> PCI config registers.
>>
>> But regardless, I think the better fix is to never set ATA_HOST_SIMPLEX
>> if ATA_FLAG_NO_LEGACY is set.
>>
>> None of the SATA controllers I've ever encountered has been simplex.
>
> Just another data point. The same problem is reported by bug #7590.
>
> http://bugzilla.kernel.org/show_bug.cgi?id=7590
>
> Is somebody brewing a patch?
Not to my knowledge. Did you just volunteer? ;-)
/me runs...
Jeff
next prev parent reply other threads:[~2006-12-20 0:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-13 5:02 SATA DMA problem (sata_uli) David Shirley
2006-12-13 11:20 ` Alan
2006-12-16 16:13 ` Jeff Garzik
2006-12-20 0:32 ` Tejun Heo
2006-12-20 0:39 ` Jeff Garzik [this message]
2006-12-20 2:44 ` Tejun Heo
2006-12-27 13:44 ` Tejun Heo
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