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

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On 23 December 2015 at 03:26, Arnd Bergmann <arnd@arndb.de> wrote:
> On Tuesday 22 December 2015, Santosh Shukla wrote:
>> }
>>
>> 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?
>

I looked at file: drivers/vfio/pci/vfio_pci.c, func vfio_pci_map() and
it look to me that it only maps ioresource_mem pci region, pasting
code snap:

if (!(pci_resource_flags(pdev, index) & IORESOURCE_MEM))
return -EINVAL;
....

and I want to map ioresource_io pci region for arm platform in my
use-case. Not sure vfio maps pci_iobar region?

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

>         Arnd
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Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit  and 32-bit ports Santosh Shukla <santosh.shukla@linaro.org> - 2015-12-22 12:00 +0100
  Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit and 32-bit ports Arnd Bergmann <arnd@arndb.de> - 2015-12-22 23:00 +0100
    Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit and 32-bit ports "H. Peter Anvin" <hpa@zytor.com> - 2015-12-22 23:10 +0100
      Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit and 32-bit ports Arnd Bergmann <arnd@arndb.de> - 2015-12-22 23:20 +0100
    Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit  and 32-bit ports Santosh Shukla <santosh.shukla@linaro.org> - 2015-12-23 12:40 +0100
      Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit and 32-bit ports Arnd Bergmann <arnd@arndb.de> - 2015-12-29 14:30 +0100
        Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit  and 32-bit ports Santosh Shukla <santosh.shukla@linaro.org> - 2015-12-29 17:00 +0100
          Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit  and 32-bit ports Santosh Shukla <santosh.shukla@linaro.org> - 2015-12-29 17:00 +0100
            Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit and 32-bit ports Arnd Bergmann <arnd@arndb.de> - 2015-12-29 17:30 +0100
              Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit  and 32-bit ports Santosh Shukla <sshukla@mvista.com> - 2015-12-29 17:40 +0100
                Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit  and 32-bit ports Alex Williamson <alex.williamson@redhat.com> - 2015-12-29 18:40 +0100
                Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit  and 32-bit ports Santosh Shukla <sshukla@mvista.com> - 2015-12-31 10:40 +0100
                Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit  and 32-bit ports Alex Williamson <alex.williamson@redhat.com> - 2015-12-31 16:50 +0100

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