From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755492AbXJCBeW (ORCPT ); Tue, 2 Oct 2007 21:34:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753171AbXJCBeP (ORCPT ); Tue, 2 Oct 2007 21:34:15 -0400 Received: from havoc.gtf.org ([69.61.125.42]:42349 "EHLO havoc.gtf.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753059AbXJCBeO (ORCPT ); Tue, 2 Oct 2007 21:34:14 -0400 Date: Tue, 2 Oct 2007 21:34:13 -0400 From: Jeff Garzik To: ak@suse.de Cc: LKML , Andrew Morton Subject: [PATCH] Document x86-64 iommu kernel parameters Message-ID: <20071003013413.GA17717@havoc.gtf.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.14 (2007-02-12) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Jeff Garzik --- After having to go figure out what some of these means, I figured I would save others the trouble. Some of these are "best guess" based on a quick scan of the code, so it certainly needs a sanity review before going upstream. diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 4d175c7..8afea9b 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -763,6 +763,30 @@ and is between 256 and 4096 characters. It is defined in the file inttest= [IA64] + iommu=option[,option..] [X86-64] + off Disable IOMMU. + force Unconditionally enable IOMMU. + noforce Disable IOMMU and IOMMU merging, by default. + biomerge Unconditionally enable IOMMU, IOMMU merging, + and set BIO IOMMU vmerge boundary to 4096. + panic Panic on IOMMU overflow. + nopanic Do not panic on IOMMU overflow. + merge Unconditionally enable IOMMU, IOMMU merging. + nomerge Disable IOMMU merging. + forcesac Force single address cycle (SAC, 32-bit). + allowdac Permit dual address cycle (DAC, 64-bit). + nodac Forbid dual address cycle (DAC, 64-bit). + soft Enable swiotlb. + calgary Use Calgary IOMMU. + + (GART-only options follow...) + Specify size of remapping area. + fullflush Disable optimizing flushing strategy. + nofullflush Enable optimizing flushing strategy. + noagp Use entire aperture, AGP isn't using it. + noaperture Disable aperture fixups / hole init. + memaper= malloc an aperture of order N. + io7= [HW] IO7 for Marvel based alpha systems See comment before marvel_specify_io7 in arch/alpha/kernel/core_marvel.c.