linux-kernel - Re: DMA Engine: Transfer From Userspace

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Message-ID: <20200622094209.GH2324254@vkoul-mobl>
Date:   Mon, 22 Jun 2020 15:12:09 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Federico Vaga <federico.vaga@...n.ch>
Cc:     Dan Williams <dan.j.williams@...el.com>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: DMA Engine: Transfer From Userspace

On 22-06-20, 11:25, Federico Vaga wrote:
> On Sat, Jun 20, 2020 at 12:47:16AM +0200, Federico Vaga wrote:
> > Hello,
> > 
> > is there the possibility of using a DMA engine channel from userspace?
> > 
> > Something like:
> > - configure DMA using ioctl() (or whatever configuration mechanism)
> > - read() or write() to trigger the transfer
> 
> Let me add one more question related to my case. The dmatest module does not
> perform tests on SLAVEs. why?

For slaves, we need some driver to do the peripheral configuration,
dmatest cannot do that and is suited for memcpy operations

Thanks
-- 
~Vinod