Message-ID: <1478761707.7430.119.camel@kernel.crashing.org>
Subject: Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for
 special ISA
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: "zhichang.yuan" <yuanzhichang@hisilicon.com>, catalin.marinas@arm.com,
        will.deacon@arm.com, robh+dt@kernel.org, bhelgaas@google.com,
        olof@lixom.net, arnd@arndb.de, linux-arm-kernel@lists.infradead.org,
        lorenzo.pieralisi@arm.com, linux-kernel@vger.kernel.org,
        linuxarm@huawei.com, devicetree@vger.kernel.org,
        linux-pci@vger.kernel.org, linux-serial@vger.kernel.org,
        minyard@acm.org, liviu.dudau@arm.com, zourongrong@gmail.com,
        john.garry@huawei.com, gabriele.paoloni@huawei.com,
        zhichang.yuan02@gmail.com, kantyzc@163.com, xuwei5@hisilicon.com,
        marc.zyngier@arm.com
Date: Thu, 10 Nov 2016 18:08:27 +1100
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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.