linux-kernel - Re: [PATCH] arm: dma-mapping: move consistent_init to early

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Date:	Fri, 17 Dec 2010 03:09:18 -0800 (PST)
From:	"Saravana Kannan" <skannan@...eaurora.org>
To:	"Russell King - ARM Linux" <linux@....linux.org.uk>
Cc:	"Saravana Kannan" <skannan@...eaurora.org>,
	"Catalin Marinas" <catalin.marinas@....com>,
	dwalker@...eaurora.org, linux-arm-msm@...r.kernel.org,
	"Nicolas Pitre" <nico@...vell.com>, linux-kernel@...r.kernel.org,
	"Jeff Ohlstein" <johlstei@...eaurora.org>,
	"Tejun Heo" <tj@...nel.org>, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm: dma-mapping: move consistent_init to 
     early_initcall


> On Fri, Dec 17, 2010 at 02:26:44AM -0800, Saravana Kannan wrote:
>> After Catalin's response to clarify, if we still end up not treating
>> secure domain as a "DMA device", then what's the alternative? Can we get
>> an explicit "cache invalidate API" that's outside of the DMA APIs? Or a
>> general uncached pages alloc/free APIs?
>
> The answer _always_ is that if the existing APIs don't give you want
> you need, then either the APIs need extending or a new API needs to
> be created.

I will wait to hear Catalin's clarification before I proceed further with
this point.

>
> In any case, have you looked at the latest set of SCM patches?  They
> don't make use of DMA coherent memory anymore, so the problem would
> seem to be resolved.
>

Yes, I saw them and even pointed out a few issues during internal-prelim
review. The new patches get around it with what we hope is a temporary
solution -- implement cache invalidate in assembly and call it over a
kmalloc'ed and page aligned memory.

-Saravana
-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


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