linux-kernel - Re: [RFC 1/3 v3] mm: iommu: An API to unify IOMMU, CPU and device memory management

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Message-ID: <20100716075856.GC16124@n2100.arm.linux.org.uk>
Date:	Fri, 16 Jul 2010 08:58:56 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Tim HRM <zt.tmzt@...il.com>
Cc:	Zach Pfeffer <zpfeffer@...eaurora.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	ebiederm@...ssion.com, linux-arch@...r.kernel.org,
	dwalker@...eaurora.org, mel@....ul.ie,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, andi@...stfloor.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC 1/3 v3] mm: iommu: An API to unify IOMMU, CPU and device
	memory management

On Thu, Jul 15, 2010 at 08:48:36PM -0400, Tim HRM wrote:
> Interesting, since I seem to remember the MSM devices mostly conduct
> IO through regions of normal RAM, largely accomplished through
> ioremap() calls.
> 
> Without more public domain documentation of the MSM chips and AMSS
> interfaces I wouldn't know how to avoid this, but I can imagine it
> creates a bit of urgency for Qualcomm developers as they attempt to
> upstream support for this most interesting SoC.

As the patch has been out for RFC since early April on the linux-arm-kernel
mailing list (Subject: [RFC] Prohibit ioremap() on kernel managed RAM),
and no comments have come back from Qualcomm folk.

The restriction on creation of multiple V:P mappings with differing
attributes is also fairly hard to miss in the ARM architecture
specification when reading the sections about caches.
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