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

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On Wednesday, November 9, 2016 1:54:53 PM CET One Thousand Gnomes wrote:
> > I think it is a relatively safe assumption that there is only one
> > ISA bridge. A lot of old drivers hardcode PIO or memory addresses
> 
> It's not a safe assumption for x86 at least. There are a few systems with
> multiple ISA busses particularly older laptops with a docking station.

But do they have multiple ISA domains? There is no real harm in supporting
it, the (small) downsides I can think of are:

- a few extra cycles for the lookup, from possibly walking a linked list
  to find the correct set of helpers and MMIO addresses
- making it too general could invite more people to design hardware
  around the infrastructure when we really want them to stop adding
  stuff like this.

	Arnd

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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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