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

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On Wed, Nov 09, 2016 at 10:12:59AM +1100, Benjamin Herrenschmidt wrote:
> On Tue, 2016-11-08 at 11:49 +0000, Mark Rutland wrote:
> > I believe that we could theoretically have multiple independent LPC/ISA
> > busses, as is possible with PCI on !x86 systems. If the current ISA code
> > assumes a singleton bus, I think that's something that needs to be fixed
> > up more generically.
> > 
> > I don't see why we should need any architecture-specific code here. Why
> > can we not fix up the ISA bus code in drivers/of/address.c such that it
> > handles multiple ISA bus instances, and translates all sub-device
> > addresses relative to the specific bus instance?
> 
> What in that code prevents that today ?

It appears I was mistaken w.r.t. the singleton comment. We can already
translate MMIO->MMIO addresses per-instance (in the presence of a ranges
property).

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.

Thanks,
Mark.

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[PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA "zhichang.yuan" <yuanzhichang@hisilicon.com> - 2016-11-08 04:30 +0100
  Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA kbuild test robot <lkp@intel.com> - 2016-11-08 06:30 +0100
  Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA kbuild test robot <lkp@intel.com> - 2016-11-08 06:30 +0100
  Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Mark Rutland <mark.rutland@arm.com> - 2016-11-08 13:00 +0100
    Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA Arnd Bergmann <arnd@arndb.de> - 2016-11-08 17:30 +0100
      Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Mark Rutland <mark.rutland@arm.com> - 2016-11-08 18:20 +0100
      Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-11-09 15:00 +0100
        RE: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Gabriele Paoloni <gabriele.paoloni@huawei.com> - 2016-11-09 16:00 +0100
        Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA Arnd Bergmann <arnd@arndb.de> - 2016-11-09 22:40 +0100
    Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2016-11-09 00:20 +0100
      Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Mark Rutland <mark.rutland@arm.com> - 2016-11-09 12:30 +0100
        Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2016-11-10 08:20 +0100
  Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA liviu.dudau@arm.com - 2016-11-09 12:50 +0100
    RE: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Gabriele Paoloni <gabriele.paoloni@huawei.com> - 2016-11-09 17:20 +0100
      Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA "liviu.dudau@arm.com" <liviu.dudau@arm.com> - 2016-11-09 18:00 +0100
        Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special  ISA "zhichang.yuan" <yuanzhichang@hisilicon.com> - 2016-11-10 07:30 +0100
        RE: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Gabriele Paoloni <gabriele.paoloni@huawei.com> - 2016-11-10 17:10 +0100
          Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA "liviu.dudau@arm.com" <liviu.dudau@arm.com> - 2016-11-11 11:40 +0100

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