Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755695Ab2E2UvN (ORCPT ); Tue, 29 May 2012 16:51:13 -0400 Received: from terminus.zytor.com ([198.137.202.10]:57178 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754735Ab2E2UvL (ORCPT ); Tue, 29 May 2012 16:51:11 -0400 Message-ID: <4FC536A5.6020600@zytor.com> Date: Tue, 29 May 2012 13:50:45 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 MIME-Version: 1.0 To: Yinghai Lu CC: David Miller , Tony Luck , Bjorn Helgaas , Linus Torvalds , Steven Newbury , Andrew Morton , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 02/11] PCI: Try to allocate mem64 above 4G at first References: <1337754877-19759-1-git-send-email-yinghai@kernel.org> <20120525043651.GA1391@google.com> <20120525193716.GA8817@google.com> <4FC50E09.4000204@zytor.com> <4FC51D79.6010804@zytor.com> In-Reply-To: X-Enigmail-Version: 1.4.1 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: 1306 Lines: 40 On 05/29/2012 01:46 PM, Yinghai Lu wrote: > On Tue, May 29, 2012 at 12:03 PM, H. Peter Anvin wrote: >> On 05/29/2012 11:17 AM, Yinghai Lu wrote: >>> >>> pci bridge could support 16bits and 32bits io port. >>> but we did not record if 32bits is supported. >>> >> >> Okay, so this is the actual problem, no? > > their fw could not need kernel help to allocate io ports, or they are > only use device that support 32bit ioport. > That barely parses, never mind makes sense. >> >>> so during allocating, could have allocated above 64k address to non >>> 32bit bridge. >>> >>> but x86 is ok, because ioport.end always set to 0xffff. >>> other arches with IO_SPACE_LIMIT with 0xffffffff or >>> 0xffffffffffffffffUL may have problem. >> >> The latter is nonsense, the PCI-side address space is only 32 bits wide. >> > maybe they have unified io include ioport and mem io? > The bus-side address space should not be more than 32 bits no matter what. As Bjorn indicates, you seem to be mixing up bus and cpu addresses all over the place. -hpa -- 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/