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SubjectRe: [PATCH 34/34] AMD IOMMU: add documentation for kernel parameters

* FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:

> On Thu, 26 Jun 2008 21:28:10 +0200
> Joerg Roedel <joerg.roedel@amd.com> wrote:
>
> > Add documentation for the kernel parameters introduced with this driver.
> >
> > Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
> > ---
> > Documentation/kernel-parameters.txt | 12 ++++++++++++
> > 1 files changed, 12 insertions(+), 0 deletions(-)
> >
> > diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> > index e07c432..fc8f936 100644
> > --- a/Documentation/kernel-parameters.txt
> > +++ b/Documentation/kernel-parameters.txt
> > @@ -271,6 +271,18 @@ and is between 256 and 4096 characters. It is defined in the file
> > aic79xx= [HW,SCSI]
> > See Documentation/scsi/aic79xx.txt.
> >
> > + amd_iommu= [HW,X86-84]
> > + Pass parameters to the AMD IOMMU driver in the system.
> > + Possible values are:
> > + off - disable the driver for AMD IOMMU
> > + isolate - enable device isolation (each device, as far
> > + as possible, will get its own protection
> > + domain)
> > + amd_iommu_size= [HW,X86-64]
> > + Define the size of the aperture for the AMD IOMMU
> > + driver. Possible values are:
> > + '32M', '64M' (default), '128M', '256M', '512M', '1G'
> > +
> > amijoy.map= [HW,JOY] Amiga joystick support
> > Map of devices attached to JOY0DAT and JOY1DAT
> > Format: <a>,<b>
>
> Documentation/x86_64/boot-options.txt would be a better place?
>
> Probabaly, it would be better to clean up x86_64 IOMMU options.

yeah, agreed. There should be a single set of options that is largely
transparent to the type of iommu used (for those options which are
commonly implemented - like iommu_size= and iommu= both are).

That belongs in a followup patchset that is decoupled from this IOMMU
driver submission and should include all current IOMMU(-ish) drivers.
(If you'd like to work on that we could try any such patchset in -tip,
ontop of tip/x86/amd-iommu - to keep integration simple.)

Ingo


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