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GET /api/patches/2223138/?format=api
{ "id": 2223138, "url": "http://patchwork.ozlabs.org/api/patches/2223138/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260414141514.1341429-2-den@valinux.co.jp/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api", "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, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260414141514.1341429-2-den@valinux.co.jp>", "list_archive_url": null, "date": "2026-04-14T14:15:08", "name": "[v14,1/7] PCI: endpoint: Add auxiliary resource query API", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "6edb8a12a16eebb6187a89a1e85ab2bc852c898d", "submitter": { "id": 91573, "url": "http://patchwork.ozlabs.org/api/people/91573/?format=api", "name": "Koichiro Den", "email": "den@valinux.co.jp" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260414141514.1341429-2-den@valinux.co.jp/mbox/", "series": [ { "id": 499855, "url": "http://patchwork.ozlabs.org/api/series/499855/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=499855", "date": "2026-04-14T14:15:08", "name": "PCI: endpoint: pci-ep-msi: Add embedded doorbell fallback", "version": 14, "mbox": "http://patchwork.ozlabs.org/series/499855/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2223138/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2223138/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-52492-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pci@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ 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dkim=pass header.d=valinux.co.jp; arc=none" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=valinux.co.jp;\n s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=/4HnJvHpfcGaR8/bBQQX4t9TQMonu32ecofiMGCq9CA=;\n b=F90S0QhYr2It4KKgsdmTGcLkjWiSz3schs9UoOw43Um4O2qFoSJYy0YHqDgVY5ycUOn/4UJKl5YWkZJQnB3PeKY6ECflUYqZp6NcYbFszk5uYayubbgayzgTs3vJnmIZQILTkbdVCrnanBN7dI85z1SlUVue5S7xtinTqg57280=", "From": "Koichiro Den <den@valinux.co.jp>", "To": "Jingoo Han <jingoohan1@gmail.com>,\n Manivannan Sadhasivam <mani@kernel.org>,\n Lorenzo Pieralisi <lpieralisi@kernel.org>, =?utf-8?q?Krzysztof_Wilczy=C5=84?=\n\t=?utf-8?q?ski?= <kwilczynski@kernel.org>, Rob Herring <robh@kernel.org>,\n Bjorn Helgaas <bhelgaas@google.com>,\n Kishon Vijay Abraham I <kishon@kernel.org>, Jon Mason <jdmason@kudzu.us>,\n Dave Jiang <dave.jiang@intel.com>, Allen Hubbe <allenbh@gmail.com>,\n Niklas Cassel <cassel@kernel.org>, Frank Li <Frank.Li@nxp.com>,\n Bhanu Seshu Kumar Valluri <bhanuseshukumar@gmail.com>,\n Marco Crivellari <marco.crivellari@suse.com>,\n Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>,\n Manikanta Maddireddy <mmaddireddy@nvidia.com>", "Cc": "linux-pci@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tntb@lists.linux.dev", "Subject": "[PATCH v14 1/7] PCI: endpoint: Add auxiliary resource query API", "Date": "Tue, 14 Apr 2026 23:15:08 +0900", "Message-ID": "<20260414141514.1341429-2-den@valinux.co.jp>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20260414141514.1341429-1-den@valinux.co.jp>", "References": "<20260414141514.1341429-1-den@valinux.co.jp>", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-ClientProxiedBy": "TYCP301CA0071.JPNP301.PROD.OUTLOOK.COM\n (2603:1096:405:7d::18) To TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM\n (2603:1096:405:38f::10)", "Precedence": "bulk", "X-Mailing-List": "linux-pci@vger.kernel.org", "List-Id": "<linux-pci.vger.kernel.org>", "List-Subscribe": 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", "X-OriginatorOrg": "valinux.co.jp", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 6cced81d-566d-4a77-973b-08de9a30686b", "X-MS-Exchange-CrossTenant-AuthSource": "TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "14 Apr 2026 14:16:23.4654\n (UTC)", "X-MS-Exchange-CrossTenant-FromEntityHeader": "Hosted", "X-MS-Exchange-CrossTenant-Id": "7a57bee8-f73d-4c5f-a4f7-d72c91c8c111", "X-MS-Exchange-CrossTenant-MailboxType": "HOSTED", "X-MS-Exchange-CrossTenant-UserPrincipalName": "\n leFoA9I8YDZRW1hE1DkojXrrUK4nh2IIHt067mYdvzSL7m0nwBh/6yrQfhsowZcn9s2GzeEok7a3SqSuV6VKCg==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "TY3P286MB2529" }, "content": "Endpoint controller drivers may integrate auxiliary blocks (e.g. DMA\nengines) whose register windows and descriptor memories metadata need to\nbe exposed to a remote peer. Endpoint function drivers need a generic\nway to discover such resources without hard-coding controller-specific\nhelpers.\n\nAdd pci_epc_get_aux_resources_count() / pci_epc_get_aux_resources() and\nthe corresponding pci_epc_ops callbacks. The count helper returns the\nnumber of available resources, while the get helper fills a\ncaller-provided array of resources described by type, physical address\nand size, plus type-specific metadata.\n\nSuggested-by: Manivannan Sadhasivam <mani@kernel.org>\nSuggested-by: Frank Li <Frank.li@nxp.com>\nSigned-off-by: Koichiro Den <den@valinux.co.jp>\n---\nChanges in v14:\n - Fix whitespace and alignment issues reported by checkpatch.pl.\n\n drivers/pci/endpoint/pci-epc-core.c | 80 +++++++++++++++++++++++++++++\n include/linux/pci-epc.h | 54 +++++++++++++++++++\n 2 files changed, 134 insertions(+)", "diff": "diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c\nindex 6c3c58185fc5..831b40458dcd 100644\n--- a/drivers/pci/endpoint/pci-epc-core.c\n+++ b/drivers/pci/endpoint/pci-epc-core.c\n@@ -156,6 +156,86 @@ const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,\n }\n EXPORT_SYMBOL_GPL(pci_epc_get_features);\n \n+/**\n+ * pci_epc_get_aux_resources_count() - get the number of EPC-provided auxiliary resources\n+ * @epc: EPC device\n+ * @func_no: function number\n+ * @vfunc_no: virtual function number\n+ *\n+ * Some EPC backends integrate auxiliary blocks (e.g. DMA engines) whose control\n+ * registers and/or descriptor memories can be exposed to the host by mapping\n+ * them into BAR space. This helper queries how many such resources the backend\n+ * provides.\n+ *\n+ * Return: the number of available resources on success, -EOPNOTSUPP if the\n+ * backend does not support auxiliary resource queries, or another -errno on\n+ * failure.\n+ */\n+int pci_epc_get_aux_resources_count(struct pci_epc *epc, u8 func_no,\n+\t\t\t\t u8 vfunc_no)\n+{\n+\tint count;\n+\n+\tif (!epc || !epc->ops)\n+\t\treturn -EINVAL;\n+\n+\tif (!pci_epc_function_is_valid(epc, func_no, vfunc_no))\n+\t\treturn -EINVAL;\n+\n+\tif (!epc->ops->get_aux_resources_count)\n+\t\treturn -EOPNOTSUPP;\n+\n+\tmutex_lock(&epc->lock);\n+\tcount = epc->ops->get_aux_resources_count(epc, func_no,\n+\t\t\t\t\t\t vfunc_no);\n+\tmutex_unlock(&epc->lock);\n+\n+\treturn count;\n+}\n+EXPORT_SYMBOL_GPL(pci_epc_get_aux_resources_count);\n+\n+/**\n+ * pci_epc_get_aux_resources() - query EPC-provided auxiliary resources\n+ * @epc: EPC device\n+ * @func_no: function number\n+ * @vfunc_no: virtual function number\n+ * @resources: output array\n+ * @num_resources: size of @resources array in entries\n+ *\n+ * Some EPC backends integrate auxiliary blocks (e.g. DMA engines) whose control\n+ * registers and/or descriptor memories can be exposed to the host by mapping\n+ * them into BAR space. This helper queries the backend for such resources.\n+ *\n+ * Return: 0 on success, -EOPNOTSUPP if the backend does not support auxiliary\n+ * resource queries, or another -errno on failure.\n+ */\n+int pci_epc_get_aux_resources(struct pci_epc *epc, u8 func_no, u8 vfunc_no,\n+\t\t\t struct pci_epc_aux_resource *resources,\n+\t\t\t int num_resources)\n+{\n+\tint ret;\n+\n+\tif (!resources || num_resources <= 0)\n+\t\treturn -EINVAL;\n+\n+\tif (!epc || !epc->ops)\n+\t\treturn -EINVAL;\n+\n+\tif (!pci_epc_function_is_valid(epc, func_no, vfunc_no))\n+\t\treturn -EINVAL;\n+\n+\tif (!epc->ops->get_aux_resources)\n+\t\treturn -EOPNOTSUPP;\n+\n+\tmutex_lock(&epc->lock);\n+\tret = epc->ops->get_aux_resources(epc, func_no, vfunc_no, resources,\n+\t\t\t\t\t num_resources);\n+\tmutex_unlock(&epc->lock);\n+\n+\treturn ret;\n+}\n+EXPORT_SYMBOL_GPL(pci_epc_get_aux_resources);\n+\n /**\n * pci_epc_stop() - stop the PCI link\n * @epc: the link of the EPC device that has to be stopped\ndiff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h\nindex 1eca1264815b..f247cf9bcf1a 100644\n--- a/include/linux/pci-epc.h\n+++ b/include/linux/pci-epc.h\n@@ -61,6 +61,47 @@ struct pci_epc_map {\n \tvoid __iomem\t*virt_addr;\n };\n \n+/**\n+ * enum pci_epc_aux_resource_type - auxiliary resource type identifiers\n+ * @PCI_EPC_AUX_DOORBELL_MMIO: Doorbell MMIO, that might be outside the DMA\n+ * controller register window\n+ *\n+ * EPC backends may expose auxiliary blocks (e.g. DMA engines) by mapping their\n+ * register windows and descriptor memories into BAR space. This enum\n+ * identifies the type of each exposable resource.\n+ */\n+enum pci_epc_aux_resource_type {\n+\tPCI_EPC_AUX_DOORBELL_MMIO,\n+};\n+\n+/**\n+ * struct pci_epc_aux_resource - a physical auxiliary resource that may be\n+ * exposed for peer use\n+ * @type: resource type, see enum pci_epc_aux_resource_type\n+ * @phys_addr: physical base address of the resource\n+ * @size: size of the resource in bytes\n+ * @bar: BAR number where this resource is already exposed to the RC\n+ * (NO_BAR if not)\n+ * @bar_offset: offset within @bar where the resource starts (valid iff\n+ * @bar != NO_BAR)\n+ * @u: type-specific metadata\n+ */\n+struct pci_epc_aux_resource {\n+\tenum pci_epc_aux_resource_type type;\n+\tphys_addr_t phys_addr;\n+\tresource_size_t size;\n+\tenum pci_barno bar;\n+\tresource_size_t bar_offset;\n+\n+\tunion {\n+\t\t/* PCI_EPC_AUX_DOORBELL_MMIO */\n+\t\tstruct {\n+\t\t\tint irq; /* IRQ number for the doorbell handler */\n+\t\t\tu32 data; /* write value to ring the doorbell */\n+\t\t} db_mmio;\n+\t} u;\n+};\n+\n /**\n * struct pci_epc_ops - set of function pointers for performing EPC operations\n * @write_header: ops to populate configuration space header\n@@ -84,6 +125,9 @@ struct pci_epc_map {\n * @start: ops to start the PCI link\n * @stop: ops to stop the PCI link\n * @get_features: ops to get the features supported by the EPC\n+ * @get_aux_resources_count: ops to get the number of controller-owned\n+ * auxiliary resources\n+ * @get_aux_resources: ops to retrieve controller-owned auxiliary resources\n * @owner: the module owner containing the ops\n */\n struct pci_epc_ops {\n@@ -115,6 +159,11 @@ struct pci_epc_ops {\n \tvoid\t(*stop)(struct pci_epc *epc);\n \tconst struct pci_epc_features* (*get_features)(struct pci_epc *epc,\n \t\t\t\t\t\t u8 func_no, u8 vfunc_no);\n+\tint\t(*get_aux_resources_count)(struct pci_epc *epc, u8 func_no,\n+\t\t\t\t\t u8 vfunc_no);\n+\tint\t(*get_aux_resources)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,\n+\t\t\t\t struct pci_epc_aux_resource *resources,\n+\t\t\t\t int num_resources);\n \tstruct module *owner;\n };\n \n@@ -343,6 +392,11 @@ int pci_epc_start(struct pci_epc *epc);\n void pci_epc_stop(struct pci_epc *epc);\n const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,\n \t\t\t\t\t\t u8 func_no, u8 vfunc_no);\n+int pci_epc_get_aux_resources_count(struct pci_epc *epc, u8 func_no,\n+\t\t\t\t u8 vfunc_no);\n+int pci_epc_get_aux_resources(struct pci_epc *epc, u8 func_no, u8 vfunc_no,\n+\t\t\t struct pci_epc_aux_resource *resources,\n+\t\t\t int num_resources);\n enum pci_barno\n pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);\n enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features\n", "prefixes": [ "v14", "1/7" ] }