Re: [PATCH 10/15] soc: octeontx2: Reconfig MSIX base with IOVA

From: Arnd Bergmann
Date: Tue Aug 28 2018 - 08:09:15 EST

On Tue, Aug 28, 2018 at 12:58 PM <sunil.kovvuri@xxxxxxxxx> wrote:
> From: Geetha sowjanya <gakula@xxxxxxxxxxx>
> HW interprets RVU_AF_MSIXTR_BASE address as an IOVA, hence
> create a IOMMU mapping for the physcial address configured by
> firmware and reconfig RVU_AF_MSIXTR_BASE with IOVA.
> Signed-off-by: Geetha sowjanya <gakula@xxxxxxxxxxx>
> Signed-off-by: Sunil Goutham <sgoutham@xxxxxxxxxxx>

I think this needs some more explanation. What is the difference between
the MSI-X support in this driver and every other one? Are you working
around a hardware bug, or is there something odd in the implementation
of your irqchip driver? Do you use a GIC to handle the MSI interrupts
or something else?