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[129.215.91.156]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-426e50ef821sm4879612f8f.38.2025.10.13.11.56.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Oct 2025 11:56:46 -0700 (PDT) Date: Mon, 13 Oct 2025 19:56:45 +0100 From: Karim Manaouil To: Basavaraj Natikar Cc: Raju Rangoju , Nathan Lynch , Sanjay R Mehta , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Which amd cpu families support ptdma and ae4dma? Message-ID: <20251013185645.yhrtn64mwpfom7ut@wrangler> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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