From: Christoph Hellwig <hch@lst.de>
To: Frank Li <Frank.Li@nxp.com>
Cc: "Vinod Koul" <vkoul@kernel.org>,
"Manivannan Sadhasivam" <mani@kernel.org>,
"Krzysztof Wilczyński" <kwilczynski@kernel.org>,
"Kishon Vijay Abraham I" <kishon@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Christoph Hellwig" <hch@lst.de>,
"Sagi Grimberg" <sagi@grimberg.me>,
"Chaitanya Kulkarni" <kch@nvidia.com>,
"Herbert Xu" <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
"Nicolas Ferre" <nicolas.ferre@microchip.com>,
"Alexandre Belloni" <alexandre.belloni@bootlin.com>,
"Claudiu Beznea" <claudiu.beznea@tuxon.dev>,
"Koichiro Den" <den@valinux.co.jp>,
"Niklas Cassel" <cassel@kernel.org>,
dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pci@vger.kernel.org, linux-nvme@lists.infradead.org,
mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org,
linux-crypto@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev
Subject: Re: [PATCH 1/8] dmaengine: Add API to combine configuration and preparation (sg and single)
Date: Tue, 9 Dec 2025 07:38:09 +0100 [thread overview]
Message-ID: <20251209063809.GA27728@lst.de> (raw)
In-Reply-To: <20251208-dma_prep_config-v1-1-53490c5e1e2a@nxp.com>
On Mon, Dec 08, 2025 at 12:09:40PM -0500, Frank Li wrote:
> Previously, configuration and preparation required two separate calls. This
> works well when configuration is done only once during initialization.
>
> However, in cases where the burst length or source/destination address must
> be adjusted for each transfer, calling two functions is verbose and
> requires additional locking to ensure both steps complete atomically.
>
> Add a new API and callback device_prep_slave_sg_config that combines
> configuration and preparation into a single operation. If the configuration
> argument is passed as NULL, fall back to the existing implementation.
Maybe this would be a good time to start retiring the "slave" naming
and come up with shorter names as a win-win situation?
next prev parent reply other threads:[~2025-12-09 6:38 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-08 17:09 [PATCH 0/8] dmaengine: Add new API to combine onfiguration and descriptor preparation Frank Li
2025-12-08 17:09 ` [PATCH 1/8] dmaengine: Add API to combine configuration and preparation (sg and single) Frank Li
2025-12-09 6:38 ` Christoph Hellwig [this message]
2025-12-09 15:47 ` Frank Li
2025-12-10 22:55 ` Bjorn Helgaas
2025-12-08 17:09 ` [PATCH 2/8] PCI: endpoint: pci-epf-test: use new DMA API to simple code Frank Li
2025-12-10 22:50 ` Bjorn Helgaas
2025-12-08 17:09 ` [PATCH 3/8] dmaengine: dw-edma: Use new .device_prep_slave_sg_config() callback Frank Li
2025-12-08 17:09 ` [PATCH 4/8] dmaengine: dw-edma: Pass dma_slave_config to dw_edma_device_transfer() Frank Li
2025-12-08 17:09 ` [PATCH 5/8] nvmet: pci-epf: Remove unnecessary dmaengine_terminate_sync() on each DMA transfer Frank Li
2025-12-09 6:52 ` Damien Le Moal
2025-12-09 15:44 ` Frank Li
2025-12-08 17:09 ` [PATCH 6/8] nvmet: pci-epf: Use dmaengine_prep_slave_single_config() API Frank Li
2025-12-09 6:38 ` Christoph Hellwig
2025-12-10 19:05 ` kernel test robot
2025-12-10 22:54 ` Bjorn Helgaas
2025-12-08 17:09 ` [PATCH 7/8] PCI: epf-mhi:Using new API dmaengine_prep_slave_single_config() to simple code Frank Li
2025-12-10 22:53 ` Bjorn Helgaas
2025-12-08 17:09 ` [PATCH 8/8] crypto: atmel: Use dmaengine_prep_slave_single_config() API Frank Li
2025-12-10 23:38 ` kernel test robot
2025-12-09 7:20 ` [PATCH 0/8] dmaengine: Add new API to combine onfiguration and descriptor preparation Niklas Cassel
2025-12-16 12:45 ` Vinod Koul
2025-12-16 15:10 ` Frank Li
2025-12-16 15:43 ` Vinod Koul
2025-12-16 15:55 ` Frank Li
2025-12-16 17:17 ` Vinod Koul
2025-12-16 17:28 ` Frank Li
2025-12-17 5:10 ` Vinod Koul
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