linux-kernel - Re: [PATCH v5 4/4] crypto: Add Allwinner Security System crypto accelerator

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Message-ID: <20141103103528.GA30154@gondor.apana.org.au>
Date:	Mon, 3 Nov 2014 18:35:28 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Corentin LABBE <clabbe.montjoie@...il.com>, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@....linux.org.uk, davem@...emloft.net,
	grant.likely@...aro.org, akpm@...ux-foundation.org,
	gregkh@...uxfoundation.org, joe@...ches.com,
	mchehab@....samsung.com, crope@....fi, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v5 4/4] crypto: Add Allwinner Security System crypto
 accelerator

On Mon, Nov 03, 2014 at 10:34:46AM +0100, Maxime Ripard wrote:
> What I mean is that since you are saying that drivers should do the
> kmap themselves, then *all* of the drivers are broken if they are not
> using it. And all of them are missing this kmap.

kmap is used by the software implementations to map the input/output
into virtual address space.  Drivers typically use DMA and operate
on physical addresses so they don't need kmap.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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