From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f49.google.com (mail-wr1-f49.google.com [209.85.221.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9E4AA1B983F for ; Sat, 21 Feb 2026 13:22:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771680172; cv=none; b=oeSR+7fwmori9/eg2fg0wvnAoSHYzW+VnyD+ZvtTQd4n27NXwE9ehyytRdARiV1IoWnQR8V0qxRpy9pEh7eIJxYCSVoAnd3uUvHcPRGjt6Xvbhs1xvGFNJZkDexvClZFBh7sOl0j3ORQ3rxJ2vXYejMfTHA2k3PwV0El2rmcbhQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771680172; c=relaxed/simple; bh=u4tkeMBd6TV9g/42hIkxMn2b7DOkutkdqjZPSExMCXo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=NkKsoZJZxfi5rxJr5LVgz38Vhx94B+uq3bJIkDpGuK8OyK4hbsdfbfm4jw6W93HalyP2KIqJfbwK2+yI3gDCCQySHccLZkTXrb9ziWUHP1DpOEI/Nn3U+PoF/JkXAH9O3JiGwBya9sy/uR20gfVt1OlctkM8zwnmAleAS6uGSLI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=JDH1Mv7c; arc=none smtp.client-ip=209.85.221.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="JDH1Mv7c" Received: by mail-wr1-f49.google.com with SMTP id ffacd0b85a97d-4359249bbacso2340042f8f.0 for ; Sat, 21 Feb 2026 05:22:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1771680170; x=1772284970; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=uFVC9nCnhSzeiROPOt4N4y5auQO1Tho98SnCRLzRRZo=; b=JDH1Mv7cYJGoIx0hBQT83TQt8MFE+JnHWR4dSeX7QXYI8jHPAokBfJaMIB2SLgvKiz wHQpqY86km4W0W7JAln16Z7JcCP57/DCqpqruAS2V3sv1WXgyDUPLqGpHD0s5zCDDIKl yVzRi5ll+mdqO4DPV4xeX4OUNQ8cXOUtbJnjIPVJJKehJjT2ZQh/VbmLW6P1r5eeel/K 4I/si/3UclC/9euA0BNYnd9KsHjWF7SKsDJfNZc6eZFIlXp0chcsHVAVNrtYGpiSpRgH 0UHixr/xWQjg4Sk/RQ2Cnnz1+6t80q1NaV5LN1HIU5bobYEMK3on1IC7lLh5yCFSJk7z qySQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771680170; x=1772284970; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=uFVC9nCnhSzeiROPOt4N4y5auQO1Tho98SnCRLzRRZo=; b=GpUqU1t4W3cd1EvR+F7uV9yEnwvtVrRa9Ok3sJWvHrdMtvWgyBi5RvtKinfw1tlhqH jA0mrHcANiNhxNY/dmqU30ElVrpr0H0EBV1eOghK0hvSdMgraO5ape8NyCjaWy5XvuIM ZXq1a6jrDAYUkBnlweUAPJUNRUynVU414nDN+eQxfSN0FUUTNxWSWzpOd3crjDtJAedW iS1g7/UWxXFPq5/Kh1cTrYJhDL0Hx9ZL/k8J/aCAFhfcmSL9TUEGNM0b2w32fz6kLLrX 1S0sFlMDfP5OTiobJ8KOBwfztn7m1ruyz1HQJ/L1IIbv637enNIBDVKOYWCfxasR0CcV DqEA== X-Gm-Message-State: AOJu0YwJCn4UKVnCWfGw3Z9YF33mdQvZF0uXgV7CCQJ0BnpOhODnSfLG hujipQhE42HXUdFZYe7u42i3AWHw75l8iwdyvziNXWj5DZTIe+s/dcZ2wXAYLjwc X-Gm-Gg: AZuq6aL9hct2ihv5+bF6lIIrzlpkwMC0JI2t9Xht9P929G4ZGOZ9qHv7nncJcEgNaVN P6vVSXxHycFkbyxOcVsF3TEzhrkg2wpzvHlEogxXzZMc12BB8zB+/D/QC+TdNqljgBvC3bHbQcw EaYjTpNyNgmw2XBUcb3fPmmBH0FdTp3GU7krc21583pKQUidZpHmOAYU/idhT/MNdhyfsVQgFwr QHSP4WVTR2rvfgYdC762wI2ckWEf6Qk4WjiIobiLvd/Ek9lJL95ew3tuImPMj1n+DPU/uHHx8dj GZWtlF7qXYEuhrOFLbyWisBDsM7y3nAzIEt3jhmvBEfcEqTTFQoLMxk3DR/osMc0ZxpvXxHKjII 06l2vNvwjEyHDSr7z4RlxCFiWMsro596t/B34dSVkbE5oaH4zFYvZ1pU5mTC124+b9b3v0AO52q 1vZf03lSQSR+f5chWLbKnmwaOIZCQ56aI2qOE7eA== X-Received: by 2002:a05:6000:2505:b0:435:a135:777d with SMTP id ffacd0b85a97d-4396fda9bafmr5128602f8f.9.1771680169963; Sat, 21 Feb 2026 05:22:49 -0800 (PST) Received: from ideapad ([2a02:8070:a483:bca0:8c22:565c:f0a8:cd41]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43970bfa1bdsm4645071f8f.3.2026.02.21.05.22.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Feb 2026 05:22:49 -0800 (PST) From: Alexander Gordeev To: Vinod Koul Cc: dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 0/2] dma: DMA slave device bringup tool Date: Sat, 21 Feb 2026 14:22:46 +0100 Message-ID: <20260221132248.17721-1-a.gordeev.box@gmail.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi All, This is a custom tool that can be used to bring up DMA slave devices. It consists of a user-level utility and a companion device driver that communicate via IOCTL. The tool is likely need some polishing, but I would like first get some feedback to ensure there is interest. I also tested it only on x86 and have little idea on how channel names on other architectures look like. That could especially impact the way dma_request_channel() treats user-provided target DMA channel names, as exposed via /sys/class/dma. Thanks! Alexander Gordeev (2): dmaengine/dma-slave: DMA slave device xfer passthrough driver tools/dma-slave: DMA slave device transfer utility drivers/dma/Kconfig | 7 + drivers/dma/Makefile | 1 + drivers/dma/dma-slave.c | 246 +++++++++++++++++++++++++ include/uapi/linux/dma-slave.h | 30 +++ tools/Makefile | 11 +- tools/dma/Makefile | 20 ++ tools/dma/dma-slave.c | 321 +++++++++++++++++++++++++++++++++ 7 files changed, 631 insertions(+), 5 deletions(-) create mode 100644 drivers/dma/dma-slave.c create mode 100644 include/uapi/linux/dma-slave.h create mode 100644 tools/dma/Makefile create mode 100644 tools/dma/dma-slave.c -- 2.51.0