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Date: Tue, 2 Oct 2007 21:34:13 -0400 From: Jeff Garzik <jeff@...zik.org> To: ak@...e.de Cc: LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org> Subject: [PATCH] Document x86-64 iommu kernel parameters Signed-off-by: Jeff Garzik <jgarzik@...hat.com> --- 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...) + <NNN> 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=<N> 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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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