Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756792AbXJXKua (ORCPT ); Wed, 24 Oct 2007 06:50:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756566AbXJXKto (ORCPT ); Wed, 24 Oct 2007 06:49:44 -0400 Received: from mo10.iij4u.or.jp ([210.138.174.78]:59251 "EHLO mo10.iij4u.or.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756957AbXJXKtm (ORCPT ); Wed, 24 Oct 2007 06:49:42 -0400 Date: Wed, 24 Oct 2007 19:47:52 +0900 To: akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, James.Bottomley@SteelEye.com, jens.axboe@oracle.com, greg@kroah.com, jeff@garzik.org, muli@il.ibm.com, paulus@samba.org, tony.luck@intel.com, davem@davemloft.net, kyle@parisc-linux.org, aacraid@adaptec.com, fujita.tomonori@lab.ntt.co.jp Subject: [PATCH -mm 0/11] fix iommu sg merging problem From: FUJITA Tomonori Message-Id: <67bb10d9f4e9473ddc84d9839114602c1966f19f.tomof@acm.org> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Dispatcher: imput version 20050308(IM148) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1314 Lines: 23 IOMMUs merges scatter/gather segments without considering a low level driver's restrictions. The problem is that IOMMUs can't access to the limitations because they are in request_queue. This patchset introduces a new structure, device_dma_parameters, including dma information. A pointer to device_dma_parameters is added to struct device. The bus specific structures (like pci_dev) includes device_dma_parameters. Low level drivers can use dma_set_max_seg_size to tell IOMMUs about the restrictions. We can move more dma stuff in struct device (like dma_mask) to struct device_dma_parameters later (needs some cleanups before that). This includes patches for all the IOMMUs that could merge sg (x86_64, ppc, IA64, alpha, sparc64, and parisc) though only the ppc patch was tested. The patches for other IOMMUs are only compile tested. Thanks to everyone for the comments on the previous submission to linux-scsi. This is against 2.6.24-rc1. The same patchset is also available: git://git.kernel.org/pub/scm/linux/kernel/git/tomo/linux-2.6-misc.git iommu-sg-fixes - 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/