[PATCH v3 2/2] OMAP: IOMMU: add support to callback during fault handling

[Guzman Lugo, Fernando]

On Wed, Feb 16, 2011 at 1:35 PM, David Cohen <dacohen at gmail.com> wrote:
> Add support to register an isr for IOMMU fault situations and adapt it
> to allow such (*isr)() to be used as fault callback. Drivers using IOMMU
> module might want to be informed when errors happen in order to debug it
> or react.
>
> Signed-off-by: David Cohen <dacohen at gmail.com>
> ---
>  arch/arm/mach-omap2/iommu2.c            |   17 +++++++++-
>  arch/arm/plat-omap/include/plat/iommu.h |   14 ++++++++-
>  arch/arm/plat-omap/iommu.c              |   52 ++++++++++++++++++++++---------
>  3 files changed, 65 insertions(+), 18 deletions(-)
>
....

> @@ -917,6 +912,33 @@ void iommu_put(struct iommu *obj)
>  }
>  EXPORT_SYMBOL_GPL(iommu_put);
>
> +int iommu_set_isr(const char *name,
> +                 int (*isr)(struct iommu *obj, u32 da, u32 iommu_errs,
> +                            void *priv),
> +                 void *isr_priv)
> +{
> +       struct device *dev;
> +       struct iommu *obj;
> +

if the driver support multiple user for the same iommu why can only
one callback be registered? should it support register multiple
callback function (one per user)?

Regards,
Fernando.