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Miller\" <davem@davemloft.net>,\n Nicolas Ferre <nicolas.ferre@microchip.com>,\n Alexandre Belloni <alexandre.belloni@bootlin.com>,\n Claudiu Beznea <claudiu.beznea@tuxon.dev>, Koichiro Den <den@valinux.co.jp>,\n Niklas Cassel <cassel@kernel.org>", "Cc": "dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,\n linux-pci@vger.kernel.org, linux-nvme@lists.infradead.org,\n mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org,\n linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org,\n imx@lists.linux.dev, Frank Li <Frank.Li@nxp.com>", "X-Mailer": "b4 0.14.2", "X-Developer-Signature": "v=1; a=ed25519-sha256; t=1766073392; l=2647;\n i=Frank.Li@nxp.com; s=20240130; h=from:subject:message-id;\n bh=0i1pyQAPcjqNYjjD17FWXhK8EXSuxYLG2bQc6bdiGOI=;\n b=8HhtyQ8XKWBuKPkgJF63GLSdN58WTB+gusiMIttknghRpml+OUl1q4yC1vkrOD7VyruiFmof+\n svs4QG2nt2wAJgMCAguwZnN1GFsduE5VkQ2GHV8VehcVdVtSJVNQZuB", "X-Developer-Key": "i=Frank.Li@nxp.com; a=ed25519;\n pk=I0L1sDUfPxpAkRvPKy7MdauTuSENRq+DnA+G4qcS94Q=", 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"X-OriginatorOrg": "nxp.com", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n a037aec8-0c07-4a30-7882-08de3e4e0637", "X-MS-Exchange-CrossTenant-AuthSource": "DU2PR04MB8951.eurprd04.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "18 Dec 2025 15:56:36.7066\n (UTC)", "X-MS-Exchange-CrossTenant-FromEntityHeader": "Hosted", "X-MS-Exchange-CrossTenant-Id": "686ea1d3-bc2b-4c6f-a92c-d99c5c301635", "X-MS-Exchange-CrossTenant-MailboxType": "HOSTED", "X-MS-Exchange-CrossTenant-UserPrincipalName": "\n NdL01sCncS5Zlj6QBgquSE24I29mCtEKJT8SL0Ck5AI7IigpyMMjzQ4Ylff63XyWJIjldT3toRUevlw9wmVkqQ==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "VI1PR04MB7037" }, "content": "Previously, configuration and preparation required two separate calls. This\nworks well when configuration is done only once during initialization.\n\nHowever, in cases where the burst length or source/destination address must\nbe adjusted for each transfer, calling two functions is verbose.\n\n\tif (dmaengine_slave_config(chan, &sconf)) {\n\t\tdev_err(dev, \"DMA slave config fail\\n\");\n\t\treturn -EIO;\n\t}\n\n\ttx = dmaengine_prep_slave_single(chan, dma_local, len, dir, flags);\n\nAfter new API added\n\n\ttx = dmaengine_prep_config_single(chan, dma_local, len, dir, flags, &sconf);\n\nAdditional, prevous two calls requires additional locking to ensure both\nsteps complete atomically.\n\n mutex_lock()\n dmaengine_slave_config()\n dmaengine_prep_slave_single()\n mutex_unlock()\n\nafter new API added, mutex lock can be moved. See patch\n nvmet: pci-epf: Use dmaengine_prep_config_single_safe() API\n\nSigned-off-by: Frank Li <Frank.Li@nxp.com>\n---\nChanges in v2:\n- Use name dmaengine_prep_config_single() and dmaengine_prep_config_sg()\n- Add _safe version to avoid confuse, which needn't additional mutex.\n- Update document/\n- Update commit message. add () for function name. Use upcase for subject.\n- Add more explain for remove lock.\n- Link to v1: https://lore.kernel.org/r/20251208-dma_prep_config-v1-0-53490c5e1e2a@nxp.com\n\n---\nFrank Li (8):\n dmaengine: Add API to combine configuration and preparation (sg and single)\n PCI: endpoint: pci-epf-test: Use dmaenigne_prep_config_single() to simplify code\n dmaengine: dw-edma: Use new .device_prep_config_sg() callback\n dmaengine: dw-edma: Pass dma_slave_config to dw_edma_device_transfer()\n nvmet: pci-epf: Remove unnecessary dmaengine_terminate_sync() on each DMA transfer\n nvmet: pci-epf: Use dmaengine_prep_config_single_safe() API\n PCI: epf-mhi: Use dmaengine_prep_config_single() to simplify code\n crypto: atmel: Use dmaengine_prep_config_single() API\n\n Documentation/driver-api/dmaengine/client.rst | 9 +++\n drivers/crypto/atmel-aes.c | 10 +--\n drivers/dma/dw-edma/dw-edma-core.c | 36 ++++++---\n drivers/nvme/target/pci-epf.c | 21 ++----\n drivers/pci/endpoint/functions/pci-epf-mhi.c | 52 ++++---------\n drivers/pci/endpoint/functions/pci-epf-test.c | 8 +-\n include/linux/dmaengine.h | 103 ++++++++++++++++++++++++--\n 7 files changed, 156 insertions(+), 83 deletions(-)\n---\nbase-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8\nchange-id: 20251204-dma_prep_config-654170d245a2\n\nBest regards,\n--\nFrank Li <Frank.Li@nxp.com>" }