Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit and 32-bit ports

On December 22, 2015 1:56:20 PM PST, Arnd Bergmann [off-list ref] wrote:

On Tuesday 22 December 2015, Santosh Shukla wrote:

quoted

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So I care for /dev/ioport types interface who could do more than byte
data copy to/from user-space. I tested this patch with little
modification and could able to run pmd driver for arm/arm64 case.

Like to know how to address pci_io region mapping problem for
arm/arm64, in-case /dev/ioports approach is not acceptable or else I
can spent time on restructuring the patch?

For the use case you describe, can't you use the vfio framework to
access the PCI BARs?

After all, you are talking about regular PCI devices, not access to
random unknown I/O port numbers.

Arnd

On that subject, shouldn't we have common infrastructure to deal with memory mapped I/O ports in the kernel?  Or do we have that now?  I obviously don't pay too much attention...
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