linux-kernel - Re: [PATCH 1/2] Documentation: dmaengine: Add a description of what dmatest does

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Message-ID: <CAHp75VdDZJ+aUtx-A3y62WQ5+OtrS47Ts6PDe1bGQ0OcRRV+7Q@mail.gmail.com>
Date:   Wed, 18 Aug 2021 18:27:52 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Vinod Koul <vkoul@...nel.org>, Jonathan Corbet <corbet@....net>,
        dmaengine <dmaengine@...r.kernel.org>,
        Linux Documentation List <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        patches@...aro.org, Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: Re: [PATCH 1/2] Documentation: dmaengine: Add a description of what
 dmatest does

On Wed, Aug 18, 2021 at 6:15 PM Daniel Thompson
<daniel.thompson@...aro.org> wrote:
>
> Currently it can difficult to determine what dmatest does without
> reading the source code. Let's add a description.
>
> The description is taken mostly from the patch header of
> commit 4a776f0aa922 ("dmatest: Simple DMA memcpy test client")
> although it has been edited and updated slightly.

> Signed-off-by: Haavard Skinnemoen <hskinnemoen@...el.com>

Not sure if you can use it like this (I mean the above SoB)
Otherwise it's a good idea, thanks!
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
> ---
>  Documentation/driver-api/dmaengine/dmatest.rst | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/Documentation/driver-api/dmaengine/dmatest.rst b/Documentation/driver-api/dmaengine/dmatest.rst
> index ee268d445d38..529cc2cbbb1b 100644
> --- a/Documentation/driver-api/dmaengine/dmatest.rst
> +++ b/Documentation/driver-api/dmaengine/dmatest.rst
> @@ -6,6 +6,16 @@ Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>
>  This small document introduces how to test DMA drivers using dmatest module.
>
> +The dmatest module tests DMA memcpy, memset, XOR and RAID6 P+Q operations using
> +various lengths and various offsets into the source and destination buffers. It
> +will initialize both buffers with a repeatable pattern and verify that the DMA
> +engine copies the requested region and nothing more. It will also verify that
> +the bytes aren't swapped around, and that the source buffer isn't modified.
> +
> +The dmatest module can be configured to test a specific channel. It can also
> +test multiple channels at the same time, and it can start multiple threads
> +competing for the same channel.
> +
>  .. note::
>    The test suite works only on the channels that have at least one
>    capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET
> --
> 2.30.2
>


-- 
With Best Regards,
Andy Shevchenko