linux-kernel - Re: [PATCH v2 00/14] crypto: omap-aes: Improve DMA, add PIO mode and support for AM437x

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Date:	Wed, 21 Aug 2013 21:50:52 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Joel Fernandes <joelf@...com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Mark Greer <mgreer@...malcreek.com>,
	Tony Lindgren <tony@...mide.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Rajendra Nayak <rnayak@...com>,
	Lokesh Vutla <lokeshvutla@...com>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH v2 00/14] crypto: omap-aes: Improve DMA, add PIO mode and
 support for AM437x

On Sat, Aug 17, 2013 at 09:42:21PM -0500, Joel Fernandes wrote:
> Following patch series rewrites the DMA code to be cleaner and faster. Earlier,
> only a single SG was used for DMA purpose, and the SG-list passed from the
> crypto layer was being copied and DMA'd one entry at a time. This turns out to
> be quite inefficient and lot of code, we replace it with much simpler approach
> that directly passes the SG-list from crypto to the DMA layers for cases where
> possible. For all cases where such a direct passing of SG list is not possible,
> we create a new SG-list and do the copying. This is still better than before, as
> we create an SG list as big as needed and not just 1-element list.
> 
> We also add PIO mode support to the driver, and switch to it whenever the DMA
> channel allocation is not available. This also has shown to give good performance
> for small blocks as shown below.
> 
> Tests have been performed on AM335x, OMAP4 and AM437x SoCs.
> 
> Below is a sample run on AM335x SoC (beaglebone board), showing
> performance improvement (20% for 8K blocks):

All applied.  Thanks!
-- 
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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