| Date | Wed, 9 Jul 2008 18:56:34 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 16/34] AMD IOMMU: add kernel command line parameters for AMD IOMMU |
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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.
I think you just reimplemented memparse().
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