linux-kernel - Re: [PATCH v3 1/4] crypto: Add Allwinner Security System crypto accelerator

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Message-Id: <201406221423.15193.marex@denx.de>
Date:	Sun, 22 Jun 2014 14:23:15 +0200
From:	Marek Vasut <marex@...x.de>
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,
	rdunlap@...radead.org, maxime.ripard@...e-electrons.com,
	linux@....linux.org.uk, herbert@...dor.apana.org.au,
	davem@...emloft.net, grant.likely@...aro.org,
	devicetree@...r.kernel.org, linux-doc@...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 v3 1/4] crypto: Add Allwinner Security System crypto accelerator

On Sunday, June 22, 2014 at 01:58:08 PM, Corentin LABBE wrote:
[...]
> >> + * This program is free software; you can redistribute it and/or modify
> >> + * it under the terms of the GNU General Public License as published by
> >> + * the Free Software Foundation version 2 of the License
> > 
> > The license text seems incomplete.
> > [...]
> 
> I will replace it with a simplier line "Licensed under the GPL-2."

I'd suggest you to use the SPDX license identifiers then, but that's not 
something the kernel crowd agreed upon yet IIRC.Therefore , just make the text 
complete please.

[...]

> >> +	src_addr = kmap(sg_page(in_sg)) + in_sg->offset;
> >> +	if (src_addr == NULL) {
> >> +		dev_err(ss->dev, "KMAP error for src SG\n");
> >> +		return -1;
> >> +	}
> > 
> > Why can't you just use dma_map_sg() or somesuch ?
> 
> I do not see why I will use a DMA function in a driver without DMA support.
> Perhaps I do not know some tricks.
> Can I use writel/readl on address gived by DMA API ?

Oh, ok, good question -- dear list, shall one use sg_page()+kmap or sg_virt()?

btw. I just noticed you're just feeding the hardware FIFO in a loop with data in 
the scatterlists, do I understand it correctly ? The driver will consume quite a 
lot of CPU time to do that, can you not implement DMA here ?

[...]

Best regards,
Marek Vasut
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