linux-kernel - Re: [RFC PATCH 08/12] PAT 64b: coherent mmap and sysfs bin ioctl

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Message-ID: <18277.40798.828760.919571@cargo.ozlabs.ibm.com>
Date:	Mon, 17 Dec 2007 08:57:50 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Greg KH <gregkh@...e.de>
Cc:	David Miller <davem@...emloft.net>, venkatesh.pallipadi@...el.com,
	ak@....de, ebiederm@...ssion.com, rdreier@...co.com,
	torvalds@...ux-foundation.org, airlied@...net.ie, davej@...hat.com,
	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	akpm@...ux-foundation.org, arjan@...radead.org,
	jesse.barnes@...el.com, linux-kernel@...r.kernel.org,
	suresh.b.siddha@...el.com
Subject: Re: [RFC PATCH 08/12] PAT 64b: coherent mmap and sysfs bin ioctl

Greg KH writes:

> Ok, sorry, it wasn't blindingly obvious that this was for pci sysfs
> devices that are mmaped, that makes a bit more sense.
> 
> But I'd like to see what ioctl is wanted here first.

I believe the ioctl would be to set whether the mapping goes to I/O or
memory space, and whether write-combining is allowed.

So the alternative to the ioctl would be to have multiple files in
sysfs, one per combination of modes -- i.e., 4 files, or 3 if we
exclude the "I/O with write combining" mode, which would be
reasonable.

Paul.
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