{"id":2175610,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2175610/?format=json","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/1.0/projects/28/?format=json","name":"Linux PCI development","link_name":"linux-pci","list_id":"linux-pci.vger.kernel.org","list_email":"linux-pci@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20251218-dma_prep_config-v2-1-c07079836128@nxp.com>","date":"2025-12-18T15:56:21","name":"[v2,1/8] dmaengine: Add API to combine configuration and preparation (sg and single)","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"4acb9269cb793012d1a4752d28120079d72a2a1f","submitter":{"id":68011,"url":"http://patchwork.ozlabs.org/api/1.0/people/68011/?format=json","name":"Frank Li","email":"Frank.Li@nxp.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20251218-dma_prep_config-v2-1-c07079836128@nxp.com/mbox/","series":[{"id":485872,"url":"http://patchwork.ozlabs.org/api/1.0/series/485872/?format=json","date":"2025-12-18T15:56:20","name":"dmaengine: Add new API to combine onfiguration and descriptor preparation","version":2,"mbox":"http://patchwork.ozlabs.org/series/485872/mbox/"}],"check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2175610/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=nxp.com header.i=@nxp.com header.a=rsa-sha256\n header.s=selector1 header.b=Q9OqZuSG;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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Miller\" ,\n Nicolas Ferre ,\n Alexandre Belloni ,\n Claudiu Beznea , Koichiro Den ,\n Niklas Cassel ","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 ","X-Mailer":"b4 0.14.2","X-Developer-Signature":"v=1; a=ed25519-sha256; t=1766073392; l=8714;\n i=Frank.Li@nxp.com; s=20240130; h=from:subject:message-id;\n bh=HZA1aF7jqQNTRddoCdlzxCx0gUTRMagLnXlyZCQsCG0=;\n b=MboqvRaFNRDNEZSMLvQH8AXt4tJC5JH58G3am++CmJqqSEhaObax6IW0+wcGNMeXqbkhNMJ+Q\n RSe2h8xS2pxBfl9vqzue8muehvbjIhERZoR+2NSyS2S09Tt7TcRIoEL","X-Developer-Key":"i=Frank.Li@nxp.com; a=ed25519;\n pk=I0L1sDUfPxpAkRvPKy7MdauTuSENRq+DnA+G4qcS94Q=","X-ClientProxiedBy":"PH8PR07CA0047.namprd07.prod.outlook.com\n (2603:10b6:510:2cf::10) To DU2PR04MB8951.eurprd04.prod.outlook.com\n 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6a67d886-5388-46ae-e050-08de3e4e090c","X-MS-Exchange-CrossTenant-AuthSource":"DU2PR04MB8951.eurprd04.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Internal","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"18 Dec 2025 15:56:41.4309\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 8M96Kql5sCvXmE7fo3t/jOEsj18gzHdxxw6WbGVkMKIawHCk3crOlXyWu8VnERpKIzuLPzr8P1IrJ1W6jg8Zsg==","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 and\nrequires additional locking to ensure both steps complete atomically.\n\nAdd a new API dmaengine_prep_config_single() and dmaengine_prep_config_sg()\nand callback device_prep_config_sg() that combines configuration and\npreparation into a single operation. If the configuration argument is\npassed as NULL, fall back to the existing implementation.\n\nAdd a new API dmaengine_prep_config_single_safe() and\ndmaengine_prep_config_sg_safe() for re-entrancy, which require driver\nimplement callback device_prep_config_sg().\n\nTested-by: Niklas Cassel \nSigned-off-by: Frank Li \n---\nchange in v2\n- add () for function\n- use short name device_prep_sg(), remove \"slave\" and \"config\". the 'slave'\nis reduntant. after remove slave, the function name is difference existed\none, so remove _config suffix.\n---\n Documentation/driver-api/dmaengine/client.rst | 9 +++\n include/linux/dmaengine.h | 103 ++++++++++++++++++++++++--\n 2 files changed, 105 insertions(+), 7 deletions(-)","diff":"diff --git a/Documentation/driver-api/dmaengine/client.rst b/Documentation/driver-api/dmaengine/client.rst\nindex d491e385d61a98b8a804cd823caf254a2dc62cf4..02c45b7d7a779421411eb9c68325cdedafcfe3b1 100644\n--- a/Documentation/driver-api/dmaengine/client.rst\n+++ b/Documentation/driver-api/dmaengine/client.rst\n@@ -80,6 +80,10 @@ The details of these operations are:\n \n - slave_sg: DMA a list of scatter gather buffers from/to a peripheral\n \n+ - config_sg: Similar with slave_sg, just pass down dma_slave_config\n+ struct to avoid call dmaengine_slave_config() every time if need\n+ adjust burst length or FIFO address.\n+\n - peripheral_dma_vec: DMA an array of scatter gather buffers from/to a\n peripheral. Similar to slave_sg, but uses an array of dma_vec\n structures instead of a scatterlist.\n@@ -106,6 +110,11 @@ The details of these operations are:\n \t\tunsigned int sg_len, enum dma_data_direction direction,\n \t\tunsigned long flags);\n \n+ struct dma_async_tx_descriptor *dmaengine_prep_config_sg(\n+\t\tstruct dma_chan *chan, struct scatterlist *sgl,\n+\t\tunsigned int sg_len, enum dma_transfer_direction dir,\n+\t\tunsigned long flags, struct dma_slave_config *config);\n+\n struct dma_async_tx_descriptor *dmaengine_prep_peripheral_dma_vec(\n \t\tstruct dma_chan *chan, const struct dma_vec *vecs,\n \t\tsize_t nents, enum dma_data_direction direction,\ndiff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h\nindex 99efe2b9b4ea9844ca6161208362ef18ef111d96..276dca760f95e1131f5ff5bf69752c4c9cb1bcad 100644\n--- a/include/linux/dmaengine.h\n+++ b/include/linux/dmaengine.h\n@@ -835,6 +835,8 @@ struct dma_filter {\n *\twhere the address and size of each segment is located in one entry of\n *\tthe dma_vec array.\n * @device_prep_slave_sg: prepares a slave dma operation\n+ *\t(Deprecated, use @device_prep_config_sg)\n+ * @device_prep_config_sg: prepares a slave DMA operation with dma_slave_config\n * @device_prep_dma_cyclic: prepare a cyclic dma operation suitable for audio.\n *\tThe function takes a buffer of size buf_len. The callback function will\n *\tbe called after period_len bytes have been transferred.\n@@ -934,6 +936,11 @@ struct dma_device {\n \t\tstruct dma_chan *chan, struct scatterlist *sgl,\n \t\tunsigned int sg_len, enum dma_transfer_direction direction,\n \t\tunsigned long flags, void *context);\n+\tstruct dma_async_tx_descriptor *(*device_prep_config_sg)(\n+\t\tstruct dma_chan *chan, struct scatterlist *sgl,\n+\t\tunsigned int sg_len, enum dma_transfer_direction direction,\n+\t\tunsigned long flags, struct dma_slave_config *config,\n+\t\tvoid *context);\n \tstruct dma_async_tx_descriptor *(*device_prep_dma_cyclic)(\n \t\tstruct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,\n \t\tsize_t period_len, enum dma_transfer_direction direction,\n@@ -974,22 +981,85 @@ static inline bool is_slave_direction(enum dma_transfer_direction direction)\n \t (direction == DMA_DEV_TO_DEV);\n }\n \n-static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single(\n-\tstruct dma_chan *chan, dma_addr_t buf, size_t len,\n-\tenum dma_transfer_direction dir, unsigned long flags)\n+/*\n+ * Re-entrancy and locking considerations for callers:\n+ *\n+ * dmaengine_prep_config_single(sg)_safe() is re-entrant and requires the\n+ * DMA engine driver to implement device_prep_config_sg(). It returns NULL\n+ * if device_prep_config_sg() is not implemented.\n+ *\n+ * The unsafe variant (without the _safe suffix) falls back to calling\n+ * dmaengine_slave_config() and dmaengine_prep_slave_sg() separately.\n+ * In this case, additional locking may be required, depending on the\n+ * DMA consumer's usage.\n+ */\n+static inline struct dma_async_tx_descriptor *\n+dmaengine_prep_config_sg_safe(struct dma_chan *chan, struct scatterlist *sgl,\n+\tunsigned int sg_len, enum dma_transfer_direction dir,\n+\tunsigned long flags, struct dma_slave_config *config)\n+{\n+\tif (!chan || !chan->device || !chan->device->device_prep_config_sg)\n+\t\treturn NULL;\n+\n+\treturn chan->device->device_prep_config_sg(chan, sgl, sg_len,\n+\t\t\t\t\t\t dir, flags, config, NULL);\n+}\n+\n+static inline struct dma_async_tx_descriptor *\n+dmaengine_prep_config_single_safe(struct dma_chan *chan, dma_addr_t buf,\n+\tsize_t len, enum dma_transfer_direction dir, unsigned long flags,\n+\tstruct dma_slave_config *config)\n {\n \tstruct scatterlist sg;\n+\n \tsg_init_table(&sg, 1);\n \tsg_dma_address(&sg) = buf;\n \tsg_dma_len(&sg) = len;\n \n-\tif (!chan || !chan->device || !chan->device->device_prep_slave_sg)\n+\tif (!chan || !chan->device || !chan->device->device_prep_config_sg)\n+\t\treturn NULL;\n+\n+\treturn chan->device->device_prep_config_sg(chan, &sg, 1, dir,\n+\t\t\t\t\t\t flags, config, NULL);\n+}\n+\n+static inline struct dma_async_tx_descriptor *\n+dmaengine_prep_config_single(struct dma_chan *chan, dma_addr_t buf, size_t len,\n+\tenum dma_transfer_direction dir, unsigned long flags,\n+\tstruct dma_slave_config *config)\n+{\n+\tstruct scatterlist sg;\n+\n+\tsg_init_table(&sg, 1);\n+\tsg_dma_address(&sg) = buf;\n+\tsg_dma_len(&sg) = len;\n+\n+\tif (!chan || !chan->device)\n+\t\treturn NULL;\n+\n+\tif (chan->device->device_prep_config_sg)\n+\t\treturn dmaengine_prep_config_sg_safe(chan, &sg, 1, dir,\n+\t\t\t\t\t\t flags, config);\n+\n+\tif (config)\n+\t\tif (dmaengine_slave_config(chan, config))\n+\t\t\treturn NULL;\n+\n+\tif (!chan->device->device_prep_slave_sg)\n \t\treturn NULL;\n \n \treturn chan->device->device_prep_slave_sg(chan, &sg, 1,\n \t\t\t\t\t\t dir, flags, NULL);\n }\n \n+static inline struct dma_async_tx_descriptor *\n+dmaengine_prep_slave_single(struct dma_chan *chan, dma_addr_t buf, size_t len,\n+\t\t\t enum dma_transfer_direction dir,\n+\t\t\t unsigned long flags)\n+{\n+\treturn dmaengine_prep_config_single(chan, buf, len, dir, flags, NULL);\n+}\n+\n /**\n * dmaengine_prep_peripheral_dma_vec() - Prepare a DMA scatter-gather descriptor\n * @chan: The channel to be used for this descriptor\n@@ -1009,17 +1079,36 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_peripheral_dma_vec(\n \t\t\t\t\t\t\t dir, flags);\n }\n \n-static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_sg(\n+static inline struct dma_async_tx_descriptor *dmaengine_prep_config_sg(\n \tstruct dma_chan *chan, struct scatterlist *sgl,\tunsigned int sg_len,\n-\tenum dma_transfer_direction dir, unsigned long flags)\n+\tenum dma_transfer_direction dir, unsigned long flags,\n+\tstruct dma_slave_config *config)\n {\n-\tif (!chan || !chan->device || !chan->device->device_prep_slave_sg)\n+\tif (!chan || !chan->device)\n+\t\treturn NULL;\n+\n+\tif (chan->device->device_prep_config_sg)\n+\t\treturn dmaengine_prep_config_sg_safe(chan, sgl, sg_len,\n+\t\t\t\t\tdir, flags, config);\n+\n+\tif (config)\n+\t\tif (dmaengine_slave_config(chan, config))\n+\t\t\treturn NULL;\n+\n+\tif (!chan->device->device_prep_slave_sg)\n \t\treturn NULL;\n \n \treturn chan->device->device_prep_slave_sg(chan, sgl, sg_len,\n \t\t\t\t\t\t dir, flags, NULL);\n }\n \n+static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_sg(\n+\tstruct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,\n+\tenum dma_transfer_direction dir, unsigned long flags)\n+{\n+\treturn dmaengine_prep_config_sg(chan, sgl, sg_len, dir, flags, NULL);\n+}\n+\n #ifdef CONFIG_RAPIDIO_DMA_ENGINE\n struct rio_dma_ext;\n static inline struct dma_async_tx_descriptor *dmaengine_prep_rio_sg(\n","prefixes":["v2","1/8"]}