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Question about PCI I/O space in ARM64

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Hi all，

If no pci, the PCI I/O space(16M) is mapped into an irrelevant mem space(right ?), not a right IO space,
that is, no one call pci_remap_iospace() to remap the memory mapped I/O space, once driver
like f71805f loaded, write value to IO space(see f71805f_init->f71805f_find->superio_enter->outb),
we met following oops,
------------------------
Unable to handle kernel paging request at virtual address ffffffbffee0002e
pgd = ffffffc1d68d4000
[ffffffbffee0002e] *pgd=0000000000000000, *pud=0000000000000000
Internal error: Oops: 94000046 [#1] PREEMPT SMP
Modules linked in: f71805f(+) hwmon
CPU: 3 PID: 1659 Comm: insmod Not tainted 4.5.0+ #88
Hardware name: linux,dummy-virt (DT)
task: ffffffc1f6665400 ti: ffffffc1d6418000 task.ti: ffffffc1d6418000
PC is at f71805f_find+0x6c/0x358 [f71805f]
------------------------

I am not clear about PCI I/O, but if this is indeed a bug, how to solve this issue,
any advice will be appreciated.

Thanks
Kefeng

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Question about PCI I/O space in ARM64 Kefeng Wang <wangkefeng.wang@huawei.com> - 2016-03-23 04:20 +0100
  Re: Question about PCI I/O space in ARM64 Catalin Marinas <catalin.marinas@arm.com> - 2016-03-23 11:20 +0100
    Re: Question about PCI I/O space in ARM64 Arnd Bergmann <arnd@arndb.de> - 2016-03-23 13:30 +0100
      Re: Question about PCI I/O space in ARM64 Kefeng Wang <wangkefeng.wang@huawei.com> - 2016-03-24 04:20 +0100
        Re: Question about PCI I/O space in ARM64 Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-03-24 19:00 +0100
          Re: Question about PCI I/O space in ARM64 Kefeng Wang <wangkefeng.wang@huawei.com> - 2016-03-25 08:00 +0100

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