Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932683AbVJ0WQz (ORCPT ); Thu, 27 Oct 2005 18:16:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932687AbVJ0WQz (ORCPT ); Thu, 27 Oct 2005 18:16:55 -0400 Received: from cantor2.suse.de ([195.135.220.15]:32930 "EHLO mx2.suse.de") by vger.kernel.org with ESMTP id S932675AbVJ0WQx (ORCPT ); Thu, 27 Oct 2005 18:16:53 -0400 To: Michael Madore Cc: linux-kernel@vger.kernel.org Subject: Re: PCI-DMA: high address but no IOMMU References: From: Andi Kleen Date: 28 Oct 2005 00:16:51 +0200 In-Reply-To: Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2168 Lines: 60 Michael Madore writes: > 2.6.14-rc5 on a dual Opteron nforce4 motherboard with 8GB of RAM: > > Checking aperture... > CPU 0: aperture @ be8c000000 size 32 MB > Aperture from northbridge cpu 0 too small (32 MB) > No AGP bridge found > Your BIOS doesn't leave a aperture memory hole > Please enable the IOMMU option in the BIOS setup > This costs you 64 MB of RAM > Mapping aperture over 65536 KB of RAM @ 8000000 > > ... > > PCI-DMA: Disabling AGP. > PCI-DMA: More than 4GB of RAM and no IOMMU > PCI-DMA: 32bit PCI IO may malfunction.<6>PCI-DMA: Disabling IOMMU. > > ... > > Attached scsi disk sda at scsi2, channel 0, id 0, lun 0 > Kernel panic - not syncing: PCI-DMA: high address but no IOMMU. > > With 2.6.13, the systems boots OK with these messages in the log: > > Checking aperture... > CPU 0: aperture @ 8000000 size 32 MB > Aperture from northbridge cpu 0 too small (32 MB) > No AGP bridge found > Your BIOS doesn't leave a aperture memory hole > Please enable the IOMMU option in the BIOS setup > This costs you 64 MB of RAM > Mapping aperture over 65536 KB of RAM @ 8000000 > > ... > > PCI-DMA: Disabling AGP. > PCI-DMA: aperture base @ 8000000 size 65536 KB > PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture Can you post the full boot log? > Using git bisect, I narrowed the problem down to the following commit: > > 6142891a0c0209c91aa4a98f725de0d6e2ed4918 is first bad commit > diff-tree 6142891a0c0209c91aa4a98f725de0d6e2ed4918 (from > 357e11d4cbbbb959a88a9bdbbf33a10f160b0823) > Author: Andi Kleen > Date: Mon Sep 12 18:49:24 2005 +0200 > > [PATCH] x86-64: Avoid unnecessary double bouncing for swiotlb > > PCI_DMA_BUS_IS_PHYS has to be zero even when the GART IOMMU is disabled > and the swiotlb is used. Otherwise the block layer does unnecessary > double bouncing. Your system shouldn't be using swiotlb anyways. -Andi - 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/