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    SubjectRe: [PATCH] Document x86-64 iommu kernel parameters
    On Tue, 2 Oct 2007 21:34:13 -0400 Jeff Garzik wrote:

    >
    > Signed-off-by: Jeff Garzik <jgarzik@redhat.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.

    "iommu" is listed in Documentation/x86_64/boot-options.txt
    along with more x86_64-specific boot options.
    A few other arches do something similar...


    > 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.
    > -


    ---
    ~Randy
    -
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