[RFC 6/7] iommu/core: add fault reporting

[Ohad Ben-Cohen]

On Mon, Sep 5, 2011 at 1:00 PM, Roedel, Joerg <Joerg.Roedel at amd.com> wrote:
> Please add a seperate function for setting the fault-handler. It is
> optional, so no need to be a value of the alloc-function.

Will do.

> Can you elaborate a bit on what the user of the api will do different
> between IOMMU_TLBMISS and IOMMU_NOPTE?
> My feeling is that those differences should be handled internally in the
> IOMMU driver, but probably I miss a use-case.

I actually agree. Moreover, since we're not planning on implementing
this (dynamic PTE/TLB loading is supported by the hardware, but we're
not really using it ATM), and I don't see any other user doing so at
this point, I'll just remove those two fault types altogether.

> Also, we need some flags to distinguish between the type of the fault
> (read, write, ...).

I'll add it (though it won't be used by OMAP since the hardware
doesn't tell us this info).

Thanks!
Ohad.