Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263301AbUFTUTV (ORCPT ); Sun, 20 Jun 2004 16:19:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265941AbUFTUTV (ORCPT ); Sun, 20 Jun 2004 16:19:21 -0400 Received: from ylpvm15-ext.prodigy.net ([207.115.57.46]:7623 "EHLO ylpvm15.prodigy.net") by vger.kernel.org with ESMTP id S263301AbUFTUTU (ORCPT ); Sun, 20 Jun 2004 16:19:20 -0400 Message-ID: <40D5F104.9040409@pacbell.net> Date: Sun, 20 Jun 2004 13:18:12 -0700 From: David Brownell User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20030225 X-Accept-Language: en-us, en, fr MIME-Version: 1.0 To: James Bottomley CC: Ian Molton , rmk+lkml@arm.linux.org.uk, Linux Kernel , greg@kroah.com, tony@atomide.com, jamey.hicks@hp.com, joshua@joshuawise.com Subject: Re: DMA API issues References: <1087584769.2134.119.camel@mulgrave> <20040618195721.0cf43ec2.spyro@f2s.co <40D34078.5060909@pacbell.net> <20040618204438.35278560.spyro@f2s.com> <1087588627.2134.155.camel@mulgrave <40D359BB.3090106@pacbell.net> <1087593282.2135.176.camel@mulgrave> <40D36EDE.2080803@pacbell.net> <1087600052.2135.197.camel@mulgrave> <40D4849B.3070001@pacbell.net> <20040619214126.C8063@flint.arm.linux.org.uk> <1087681604.2121.96.camel@mulgrave> <20040619234933.214b810b.spyro@f2s.com> <1087738680.10858.5.camel@mulgrave> In-Reply-To: <1087738680.10858.5.camel@mulgrave> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 685 Lines: 18 James Bottomley wrote: > The iseries can't because the PCI bus sits behind the hypervisor and has > to use accessors to get at the on chip memory, it can't simply be mapped > into the address space like it can on ARM. So you're saying that the iSeries can't implement dma_alloc_coherent() for such hardware, yes? In that case, it should return a polite failure status. Meanwhile, hardware that _can_ implement it should do so. - Dave - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/