linux-kernel - Re: [PATCH RFC] UIO: Pass information about ioports to userspace

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Message-ID: <20081124090412.GA3086@local>
Date:	Mon, 24 Nov 2008 10:04:12 +0100
From:	"Hans J. Koch" <hjk@...utronix.de>
To:	Greg KH <gregkh@...e.de>
Cc:	"Hans J. Koch" <hjk@...utronix.de>, linux-kernel@...r.kernel.org,
	Mike Frysinger <vapier@...too.org>,
	John Ogness <jogness@...utronix.de>,
	Benedikt Spranger <b.spranger@...utronix.de>
Subject: Re: [PATCH RFC] UIO: Pass information about ioports to userspace

On Sun, Nov 23, 2008 at 05:41:22PM -0800, Greg KH wrote:
> On Sun, Nov 23, 2008 at 01:14:20PM +0100, Hans J. Koch wrote:
> > Devices sometimes have memory where all or parts of it can not be mapped to
> > userspace. But it might still be possible to access this memory from
> > userspace by other means. An example are PCI cards that advertise not only
> > mappable memory but also ioport ranges. On x86 architectures, these can be
> > accessed with ioperm, iopl, inb, outb, and friends. Mike Frysinger (CCed)
> > reported a similar problem on Blackfin arch where it doesn't seem to be easy
> > to mmap non-cached memory but it can still be accessed from userspace.
> > 
> > This patch allows kernel drivers to pass information about such ports to
> > userspace. Similar to the existing mem[] array, it adds a port[] array to
> > struct uio_info. Each port range is described by start, size, and porttype.
> 
> Looks good, but I think you also forgot the documentation update :)

Not forgotten, just delayed :-)
We had other changes lately that need documentation update as well. Big patch
will come Real Soon Now...

thanks,
Hans
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