DMA Engine development
 help / color / mirror / Atom feed
From: Karim Manaouil <kmanaouil.dev@gmail.com>
To: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Cc: Raju Rangoju <Raju.Rangoju@amd.com>,
	Nathan Lynch <nathan.lynch@amd.com>,
	Sanjay R Mehta <sanju.mehta@amd.com>,
	dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Which amd cpu families support ptdma and ae4dma?
Date: Mon, 13 Oct 2025 19:56:45 +0100	[thread overview]
Message-ID: <20251013185645.yhrtn64mwpfom7ut@wrangler> (raw)

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

             reply	other threads:[~2025-10-13 18:56 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-13 18:56 Karim Manaouil [this message]
2025-10-16 11:52 ` Which amd cpu families support ptdma and ae4dma? Karim Manaouil

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20251013185645.yhrtn64mwpfom7ut@wrangler \
    --to=kmanaouil.dev@gmail.com \
    --cc=Basavaraj.Natikar@amd.com \
    --cc=Raju.Rangoju@amd.com \
    --cc=dmaengine@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=nathan.lynch@amd.com \
    --cc=sanju.mehta@amd.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox