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* Which amd cpu families support ptdma and ae4dma?
@ 2025-10-13 18:56 Karim Manaouil
  2025-10-16 11:52 ` Karim Manaouil
  0 siblings, 1 reply; 2+ messages in thread
From: Karim Manaouil @ 2025-10-13 18:56 UTC (permalink / raw)
  To: Basavaraj Natikar
  Cc: Raju Rangoju, Nathan Lynch, Sanjay R Mehta, dmaengine,
	linux-kernel

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

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2025-10-13 18:56 Which amd cpu families support ptdma and ae4dma? Karim Manaouil
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