Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754538Ab0DMBwH (ORCPT ); Mon, 12 Apr 2010 21:52:07 -0400 Received: from terminus.zytor.com ([198.137.202.10]:34459 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754481Ab0DMBwG (ORCPT ); Mon, 12 Apr 2010 21:52:06 -0400 Message-ID: <4BC3CE31.2000100@zytor.com> Date: Mon, 12 Apr 2010 18:51:45 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4 MIME-Version: 1.0 To: Bjorn Helgaas CC: Andy Isaacson , linux-kernel@vger.kernel.org, Jesse Barnes , Chris Wright , Matthew Wilcox , Yinghai Lu , Alan Cox Subject: Re: [2.6.34-rc1 REGRESSION] ahci 0000:00:1f.2: controller reset failed (0xffffffff) References: <20100406225425.GA8292@hexapodia.org> <1270612783.8518.15.camel@dc7800.home> <201004121156.41716.bjorn.helgaas@hp.com> In-Reply-To: <201004121156.41716.bjorn.helgaas@hp.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1329 Lines: 34 On 04/12/2010 10:56 AM, Bjorn Helgaas wrote: > > Linux thinks the windows are: > pci_root PNP0A03:00: host bridge window [mem 0x000a0000-0x000bffff] > pci_root PNP0A03:00: host bridge window [mem 0x000c0000-0x000effff] > pci_root PNP0A03:00: host bridge window [mem 0x000f0000-0x000fffff] > > The 0xa0000-0xbffff one makes good sense. That's normally MMIO that's > routed via PCI to the VGA device frame buffer, and we should be able > to figure out how to avoid that area, e.g., by using BIOS info, PCI > class codes, etc. > > Now we need to figure how to avoid the 0xc0000-0xeffff and 0xf0000-0xfffff > windows. Maybe there's something special about how ACPI describes them. > > Or maybe we're just unlucky because these are the first windows in the > _CRS list, and Linux tries them in order, while Windows uses a different > strategy. > I strongly suspects that Windows knows that < 1 MB is special, and only ever assigns it upon explicit allocation. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- 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/