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

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Date:	Thu, 30 Oct 2014 18:19:33 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Corentin LABBE <clabbe.montjoie@...il.com>
Cc:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@....linux.org.uk, herbert@...dor.apana.org.au,
	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 Fri, Oct 24, 2014 at 08:52:26PM +0200, Corentin LABBE wrote:
> On 10/21/14 21:11, Maxime Ripard wrote:
> > Hi Corentin,
> > 
> > Thanks for resending it.
> > 
> > On Sun, Oct 19, 2014 at 04:16:22PM +0200, LABBE Corentin wrote:
> >> Add support for the Security System included in Allwinner SoC A20.
> >> The Security System is a hardware cryptographic accelerator that support AES/MD5/SHA1/DES/3DES/PRNG algorithms.
> >>
> >> Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
> >> ---
> >>  drivers/crypto/Kconfig                    |  17 ++
> >> +static int sunxi_ss_aes_poll_atomic(struct ablkcipher_request *areq)
> >> +{
> >> +	u32 spaces;
> >> +	struct scatterlist *in_sg = areq->src;
> >> +	struct scatterlist *out_sg = areq->dst;
> >> +	void *src_addr;
> >> +	void *dst_addr;
> >> +	unsigned int ileft = areq->nbytes;
> >> +	unsigned int oleft = areq->nbytes;
> >> +	unsigned int todo;
> >> +	u32 *src32;
> >> +	u32 *dst32;
> >> +	u32 rx_cnt = 32;
> >> +	u32 tx_cnt = 0;
> >> +	int i;
> >> +
> >> +	src_addr = kmap_atomic(sg_page(in_sg)) + in_sg->offset;
> > 
> > Where does this scatter_list is coming from? Can it even be allocated
> > in highmem?
> > 
> 
> With AF_ALG and cryptodev, the SG is in highmem. Verified with some
> PageHighMem().

Then fix AF_ALG and cryptodev, because all of the other drivers might
be affected.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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