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

From	Arnd Bergmann <arnd@arndb.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit and 32-bit ports
Date	2015-12-22 23:00 +0100
Message-ID	<qID8m-TR-25@gated-at.bofh.it> (permalink)
References	<nfYuS-db-13@gated-at.bofh.it> <nntke-5pe-11@gated-at.bofh.it> <qIsPE-2RN-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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?

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

	Arnd
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Thread

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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