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    SubjectRe: [PATCH 16/34] AMD IOMMU: add kernel command line parameters for AMD IOMMU
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    On Wed, 9 Jul 2008 18:56:34 -0700
    Andrew Morton <akpm@linux-foundation.org> wrote:

    > On Thu, 26 Jun 2008 21:27:52 +0200 Joerg Roedel <joerg.roedel@amd.com> wrote:
    >
    > > This patch adds two parameters to the kernel command line to control behavior
    > > of the AMD IOMMU.
    > >
    > > Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    > > ---
    > > arch/x86/kernel/amd_iommu_init.c | 34 ++++++++++++++++++++++++++++++++++
    > > 1 files changed, 34 insertions(+), 0 deletions(-)
    > >
    > > diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
    > > index d7a75bf..ec6f13b 100644
    > > --- a/arch/x86/kernel/amd_iommu_init.c
    > > +++ b/arch/x86/kernel/amd_iommu_init.c
    > > @@ -789,3 +789,37 @@ void __init amd_iommu_detect(void)
    > > }
    > > }
    > >
    > > +static int __init parse_amd_iommu_options(char *str)
    > > +{
    > > + for (; *str; ++str) {
    > > + if (strcmp(str, "off") == 0)
    > > + amd_iommu_disable = 1;
    > > + if (strcmp(str, "isolate") == 0)
    > > + amd_iommu_isolate = 1;
    > > + }
    > > +
    > > + return 1;
    > > +}
    > > +
    > > +static int __init parse_amd_iommu_size_options(char *str)
    > > +{
    > > + for (; *str; ++str) {
    > > + if (strcmp(str, "32M") == 0)
    > > + amd_iommu_aperture_order = 25;
    > > + if (strcmp(str, "64M") == 0)
    > > + amd_iommu_aperture_order = 26;
    > > + if (strcmp(str, "128M") == 0)
    > > + amd_iommu_aperture_order = 27;
    > > + if (strcmp(str, "256M") == 0)
    > > + amd_iommu_aperture_order = 28;
    > > + if (strcmp(str, "512M") == 0)
    > > + amd_iommu_aperture_order = 29;
    > > + if (strcmp(str, "1G") == 0)
    > > + amd_iommu_aperture_order = 30;
    > > + }
    > > +
    > > + return 1;
    > > +}
    > > +
    > > +__setup("amd_iommu=", parse_amd_iommu_options);
    > > +__setup("amd_iommu_size=", parse_amd_iommu_size_options);
    >
    > Please document kernel boot parameters in Documentation/kernel-parameters.txt.

    [PATCH 34/34] does (this should have included [PATCH 34/34], I guess).

    I have one related question, we should document all the kernel boot
    parameters in Documentation/kernel-parameters.txt?

    Some of x86_64 boot parameters are in
    Documentations/x86/x86_64/boot-options.txt. The parameters of IOMMUs
    are scattered. It's confusing.

    http://marc.info/?t=121541873700001&r=1&w=2

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