linux-kernel - Re: [PATCH V2 2/3] dmaselftest: add memcpy selftest support functions

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Date:	Tue, 3 Nov 2015 12:00:09 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Sinan Kaya <okaya@...eaurora.org>
Cc:	dmaengine@...r.kernel.org, timur@...eaurora.org,
	cov@...eaurora.org, jcm@...hat.com,
	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 2/3] dmaselftest: add memcpy selftest support functions

On Mon, Nov 02, 2015 at 11:18:37PM -0500, Sinan Kaya wrote:
> 
> 
> On 11/2/2015 11:15 PM, Vinod Koul wrote:
> >On Mon, Nov 02, 2015 at 01:07:38AM -0500, Sinan Kaya wrote:
> >>This patch adds supporting utility functions
> >>for selftest. The intention is to share the self
> >>test code between different drivers.
> >>
> >>Supported test cases include:
> >>1. dma_map_single
> >>2. streaming DMA
> >>3. coherent DMA
> >>4. scatter-gather DMA
> >
> >This seems quite similar to dmatest, any reason why you cannot use/enhance
> >that?
> >
> Dmatest is a standalone kernel module intended for stress testing
> DMA engines from userspace with N number of threads and M size
> combinations etc.
> 
> This one; on the other hand, is selftest to verify hardware is
> working as expected during power up.
> 
> Almost all DMA engine drivers come with some sort of selftest code
> called from probe. I followed the same design pattern.

which ones ?

> 
> I think the goal is to remove the duplicate self test code in all
> drivers over time.

and what prevents us from having common selftest plus dmatest code. Most of
the code here to do selftest is _same_ dmaengine routine code used in
dmatest

We can have common code which is used for dmatest as well as selftest. I do
not want to see same code duplicated..

-- 
~Vinod
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