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Mon, 19 Oct 2026 18:36:56 +0000 Date: Mon, 19 Oct 2026 13:36:46 -0500 From: Frank Li To: Daniel Byrne Cc: Vinod Koul , Dave Jiang , Fenghua Yu , Frank Li , Vinicius Costa Gomes , Jonathan Corbet , Ludovic Desroches , dmaengine@vger.kernel.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/3] dmaengine: add dmaengine_async_is_tx_complete() for channel status queries Message-ID: References: <20261019150632.4026424-1-daniel1.byrne@intel.com> <20261019150632.4026424-2-daniel1.byrne@intel.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261019150632.4026424-2-daniel1.byrne@intel.com> X-ClientProxiedBy: PH7P220CA0025.NAMP220.PROD.OUTLOOK.COM (2603:10b6:510:326::27) To MI3PR04MB12438.eurprd04.prod.outlook.com (2603:10a6:290:76::14) X-Archived-By: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MI3PR04MB12438:EE_|GVXPR04MB9734:EE_ X-MS-Office365-Filtering-Correlation-Id: 734be38f-1f84-44de-0e4c-08df2e0ff42d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|19092799006|23010399003|1800799024|261009223027099003|10067099003|56012099006|3023799007|22082099003|18002099003|5023799004|11063799006|4143699003; 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Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] > > Add dmaengine_async_is_tx_complete() as the client API for polling the > completion of one transaction. Like dma_async_is_tx_complete(), which > it deprecates, it routes the query to the channel's device_tx_status() > callback; the change is that it drops the @last and @used outputs, > which only make sense for providers that complete in cookie order. > A provider that tracks per-descriptor state can answer exactly from > that state, and a high-rate in-kernel polling user, the io_uring DSA > copy offload to be posted separately, depends on such answers. Does it should wrap dmaengine_tx_status()? from naming conversion dmaengine_async_is_tx_complete() should return bool type. > > The kernel-doc says how far such an answer goes. It is exact for a > transaction submitted without DMA_PREP_INTERRUPT, on the first query > that reports it finished. An interrupt-armed transaction reports its > result through callback_result, and a cookie whose descriptor has been > retired reads DMA_COMPLETE. The client guide's advice to pause or stop > the channel before a query points at that text. I don't that it is true. Supposed user can always poll state regardless if set DMA_PREP_INTERRUPT. > > dma_async_is_complete() was only used through dma_cookie_status(), so > delete it from the client header and open-code the cookie-window > comparison there. > Move dma_set_tx_state(), which only providers call, > from the client header into drivers/dma/dmaengine.h; every in-tree Use sperate patch for such movement. Frank