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

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Message-ID: <1592CC7D-B2F2-4E8B-BB90-4A20682B1FEE@zytor.com>
Date:	Tue, 22 Dec 2015 14:02:44 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Santosh Shukla <santosh.shukla@...aro.org>
CC:	josh@...htriplett.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	akpm@...ux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-api@...r.kernel.org
Subject: 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 <arnd@...db.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?
>
>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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