linux-kernel - Re: dmatest - scatter gather mode

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Message-ID: <20160426162807.GL2274@localhost>
Date:	Tue, 26 Apr 2016 21:58:07 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Ramon Fried <ramon.fried@...demg.com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: dmatest - scatter gather mode

On Tue, Apr 26, 2016 at 05:37:04PM +0300, Andy Shevchenko wrote:
> On Sun, Apr 24, 2016 at 9:44 PM, Ramon Fried <ramon.fried@...demg.com> wrote:
> > I'm looking of a way to validate a DMA engine driver I've written.
> > I came across dmatest module and while reading the code I've noticed that scatter-gather DMA mode is not implemented.
> > I wonder if anyone one knows the reason, and if such enhancement will be welcome as a patch.
> 
> You meant the actual slave interaction? How can you implement this in
> a generic way?
> For example we are using an SPI controller in loopback mode to check DMA driver.
> In your case it might be something really specific.
> 
> Otherwise you may try mem copy functionality if your DMA engine supports such.

I think he means dma copy using sg lists, see the patch posted today for
that


-- 
~Vinod