linux-kernel - Re: Which amd cpu families support ptdma and ae4dma?

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Message-ID: <CA+uifjMUQS+nkaDqGnm77tLG38k9ZYi-mcF2eqpOKHnaF2Nvhw@mail.gmail.com>
Date: Thu, 16 Oct 2025 12:52:19 +0100
From: Karim Manaouil <kmanaouil.dev@...il.com>
To: Basavaraj Natikar <Basavaraj.Natikar@....com>
Cc: Raju Rangoju <Raju.Rangoju@....com>, Nathan Lynch <nathan.lynch@....com>, 
	Sanjay R Mehta <sanju.mehta@....com>, dmaengine@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: Which amd cpu families support ptdma and ae4dma?

Hey guys,

Just a gentle reminder. Much appreciated!

Thanks

On Mon, Oct 13, 2025 at 7:56 PM Karim Manaouil <kmanaouil.dev@...il.com> wrote:
>
> Hi folks,
>
> I have a dual AMD EPYC 9224 on a Gigabyte MZ73-LM0 server motherboard. I
> am trying to use ptdma or ae4dma to prototype a memory management
> related patch, but it doesn't seem like any of those engines exist on my
> CPU. I loaded ae4dma but /sys/class/dma and /sys/kernel/debug/dmaengine
> are empty and I can't see anyting on dmsg.
>
> I cannot find any documentation whatsover online on those engines.
>
> Could you please tell me which classes of amd cpus support those
> engines? Is there a chance I have it, but I'm missing something?
>
> I am on Linux v6.17. I also tried to check with lspci. It doesn't seem
> to report anything related to ptdma or ae4dma.
>
> Any info will be much appreciated!
>
> Thanks
>
> --
> ~karim