From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932674AbWLTAjx (ORCPT ); Tue, 19 Dec 2006 19:39:53 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932669AbWLTAjx (ORCPT ); Tue, 19 Dec 2006 19:39:53 -0500 Received: from srv5.dvmed.net ([207.36.208.214]:57061 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932674AbWLTAjx (ORCPT ); Tue, 19 Dec 2006 19:39:53 -0500 Message-ID: <45888653.6080702@pobox.com> Date: Tue, 19 Dec 2006 19:39:47 -0500 From: Jeff Garzik User-Agent: Thunderbird 1.5.0.8 (X11/20061107) MIME-Version: 1.0 To: Tejun Heo CC: Alan , David Shirley , linux-kernel@vger.kernel.org Subject: Re: SATA DMA problem (sata_uli) References: <20061213112004.59cb186c@localhost.localdomain> <45841B20.9030402@pobox.com> <458884B2.9080802@gmail.com> In-Reply-To: <458884B2.9080802@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -4.3 (----) X-Spam-Report: SpamAssassin version 3.1.7 on srv5.dvmed.net summary: Content analysis details: (-4.3 points, 5.0 required) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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 >> 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