linux-kernel - Re: [PATCH 4/4] msm: scm: Get cacheline size from CTR

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Date:	Mon, 28 Feb 2011 20:21:00 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	David Brown <davidb@...eaurora.org>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [PATCH 4/4] msm: scm: Get cacheline size from CTR

On 02/24/2011 11:56 AM, Thomas Gleixner wrote:
> On Thu, 24 Feb 2011, Stephen Boyd wrote:
>
>>
>> I definitely don't want to do it for every loop. I'm fine with getting
>> it every scm_call() invocation though.
>>
>> For now, I'll pull the end and cacheline_size variables out of the
>> do-while loop.
>
> Why not do it correct right away and retrieve it in an __init
> function?

That would require an early_initcall, so hopefully that is fine.

I wonder why the generic arm v7 cache operations don't do the same thing
and store the dcache line size somewhere. Every dma operation is
essentially calling dcache_line_size(). Perhaps some generic arm code
should be determining the dcache line size really early on and storing
it in the proc_info_list? Then both the dma code and scm code could
query the processor for the dcache line size with something like
cpu_dcache_line_size?

-- 
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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