linux-kernel - Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA

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Message-ID: <1478761707.7430.119.camel@kernel.crashing.org>
Date:   Thu, 10 Nov 2016 18:08:27 +1100
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     "zhichang.yuan" <yuanzhichang@...ilicon.com>,
        catalin.marinas@....com, will.deacon@....com, robh+dt@...nel.org,
        bhelgaas@...gle.com, olof@...om.net, arnd@...db.de,
        linux-arm-kernel@...ts.infradead.org, lorenzo.pieralisi@....com,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com,
        devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-serial@...r.kernel.org, minyard@....org, liviu.dudau@....com,
        zourongrong@...il.com, john.garry@...wei.com,
        gabriele.paoloni@...wei.com, zhichang.yuan02@...il.com,
        kantyzc@....com, xuwei5@...ilicon.com, marc.zyngier@....com
Subject: Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for
 special ISA

On Wed, 2016-11-09 at 11:20 +0000, Mark Rutland wrote:
> The big change would be to handle !MMIO translations, for which we'd
> need a runtime registry of ISA bus instance to find the relevant
> accessor ops and instance-specific data.

Yes. We do something a bit like that on ppc, we find the PCI bus
for which the IO ports match and I have a hook to register the
special indirect ISA.

It's a bit messy, we could do something nicer generically.

Cheers,
Ben.