From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753172AbWLTAdE (ORCPT ); Tue, 19 Dec 2006 19:33:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753273AbWLTAdE (ORCPT ); Tue, 19 Dec 2006 19:33:04 -0500 Received: from nz-out-0506.google.com ([64.233.162.234]:38805 "EHLO nz-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753172AbWLTAdB (ORCPT ); Tue, 19 Dec 2006 19:33:01 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:user-agent:mime-version:to:cc:subject:references:in-reply-to:x-enigmail-version:content-type:content-transfer-encoding; b=AZapLEgoJj3HQuBew6vrrL1GWy+yUmr3bM/o8biAtkp14K74pORUMTGAJGpO82qlsbaEZ/3Mpt4TeFYvV8oxnVotP3tPfPB89TZIw6q8yeUUk99mxb3B+FytZ+EmbyBbIxVNW3CM/mqcrm3gGlLrSufoHpyd+OMI0yhY7LFqklo= Message-ID: <458884B2.9080802@gmail.com> Date: Wed, 20 Dec 2006 09:32:50 +0900 From: Tejun Heo User-Agent: Icedove 1.5.0.8 (X11/20061129) MIME-Version: 1.0 To: Jeff Garzik 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> In-Reply-To: <45841B20.9030402@pobox.com> X-Enigmail-Version: 0.94.1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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? -- tejun