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    SubjectRe: [RFC 1/5] ARM: dev_archdata: add private iommu extension
    On Sun, Sep 25, 2011 at 01:58:53PM +0300, Ohad Ben-Cohen wrote:
    > Add a private iommu pointer to the ARM-specific arch data in the
    > device struct, which will be used to attach iommu-specific data
    > to devices which require iommu support.
    >
    > Different iommu implementations (on different platforms) will attach
    > different types of data to this pointer, so 'void *' is currently used
    > (the downside is reduced typesafety).
    >
    > Note: ia64, x86 and sparc have this exact iommu extension as well, and
    > if others are likely to adopt it too, we might want to consider
    > adding this to the device struct itself directly.
    >
    > Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
    > Cc: Russell King <linux@arm.linux.org.uk>
    > Cc: Arnd Bergmann <arnd@arndb.de>
    > Cc: Grant Likely <grant.likely@secretlab.ca>
    > ---
    > arch/arm/include/asm/device.h | 3 +++
    > 1 files changed, 3 insertions(+), 0 deletions(-)
    >
    > diff --git a/arch/arm/include/asm/device.h b/arch/arm/include/asm/device.h
    > index 9f390ce..6615f03 100644
    > --- a/arch/arm/include/asm/device.h
    > +++ b/arch/arm/include/asm/device.h
    > @@ -10,6 +10,9 @@ struct dev_archdata {
    > #ifdef CONFIG_DMABOUNCE
    > struct dmabounce_device_info *dmabounce;
    > #endif
    > +#ifdef CONFIG_IOMMU_API
    > + void *iommu; /* private IOMMU data */
    > +#endif

    Blech. Oh well. Not much point in doing something different if x86
    uses a void*.

    g.



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