Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935344AbXFFTSi (ORCPT ); Wed, 6 Jun 2007 15:18:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S934501AbXFFTQ1 (ORCPT ); Wed, 6 Jun 2007 15:16:27 -0400 Received: from mga01.intel.com ([192.55.52.88]:18125 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932355AbXFFTQX (ORCPT ); Wed, 6 Jun 2007 15:16:23 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.16,390,1175497200"; d="scan'208";a="253987303" Message-Id: <20070606190042.930671000@askeshav-devel.jf.intel.com> References: <20070606185658.138237000@askeshav-devel.jf.intel.com> User-Agent: quilt/0.46-1 Date: Wed, 06 Jun 2007 11:57:05 -0700 From: anil.s.keshavamurthy@intel.com To: linux-kernel@vger.kernel.org Cc: akpm@osdl.org, ak@suse.de, gregkh@suse.de, muli@il.ibm.com, asit.k.mallick@intel.com, suresh.b.siddha@intel.com, anil.s.keshavamurthy@intel.com, arjan@linux.intel.com, ashok.raj@intel.com, shaohua.li@intel.com, davem@davemloft.net Subject: [Intel-IOMMU 07/10] Intel iommu cmdline option - forcedac Content-Disposition: inline; filename=dmar_forcedac.patch Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2636 Lines: 66 Introduce intel_iommu=forcedac commandline option. This option is helpful to verify the pci device capability of handling physical dma'able address greater than 4G. Signed-off-by: Anil S Keshavamurthy --- Documentation/kernel-parameters.txt | 7 +++++++ drivers/pci/intel-iommu.c | 6 +++++- 2 files changed, 12 insertions(+), 1 deletion(-) Index: linux-2.6.22-rc3/Documentation/kernel-parameters.txt =================================================================== --- linux-2.6.22-rc3.orig/Documentation/kernel-parameters.txt 2007-06-04 12:40:29.000000000 -0700 +++ linux-2.6.22-rc3/Documentation/kernel-parameters.txt 2007-06-04 12:40:41.000000000 -0700 @@ -785,6 +785,13 @@ bypassed by not enabling DMAR with this option. In this case, gfx device will use physical address for DMA. + forcedac + With this option iommu will not optimize to look + for io virtual address below 32 bit forcing dual + address cycle on pci bus for cards supporting greater + than 32 bit addressing. The default is to look + for translation below 32 bit and if not available + then look in the higher range. io7= [HW] IO7 for Marvel based alpha systems See comment before marvel_specify_io7 in Index: linux-2.6.22-rc3/drivers/pci/intel-iommu.c =================================================================== --- linux-2.6.22-rc3.orig/drivers/pci/intel-iommu.c 2007-06-04 12:40:29.000000000 -0700 +++ linux-2.6.22-rc3/drivers/pci/intel-iommu.c 2007-06-04 12:40:41.000000000 -0700 @@ -53,6 +53,7 @@ static int dmar_disabled; static int __initdata dmar_map_gfx = 1; +static int dmar_forcedac = 0; #define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1)) static DEFINE_SPINLOCK(device_domain_lock); @@ -69,6 +70,9 @@ } else if (!strncmp(str, "igfx_off", 8)) { dmar_map_gfx = 0; printk(KERN_INFO"Intel-IOMMU: disable GFX device mapping\n"); + } else if (!strncmp(str, "forcedac", 8)) { + printk (KERN_INFO"Intel-IOMMU: Enabling DAC for PCI supporting > 32Bit DMA\n"); + dmar_forcedac = 1; } str += strcspn(str, ","); @@ -1500,7 +1504,7 @@ start_addr = IOVA_START_ADDR; - if (pdev->dma_mask <= DMA_32BIT_MASK) { + if ((pdev->dma_mask <= DMA_32BIT_MASK) || (dmar_forcedac)) { iova = iommu_alloc_iova(domain, addr, size, start_addr, pdev->dma_mask); } else { -- - 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/