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

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Message-ID: <20071218093553.GA20611@muc.de>
Date:	Tue, 18 Dec 2007 10:35:53 +0100
From:	Andi Kleen <ak@....de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Paul Mackerras <paulus@...ba.org>, Greg KH <gregkh@...e.de>,
	David Miller <davem@...emloft.net>,
	venkatesh.pallipadi@...el.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

> Well the other alternative looks like having a second file per par
> bar.  Say resource0_wc to support the write-combining mode, possibly

The intention was to support memory not in bars, but give a generic
IOMMU mapped memory interface for user space e.g. for the X server.
But that needs a way to return the bus address for the mmap mapping
and ioctl was the best I came up with for that.
Given it was never finished.

-Andi
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