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GET /api/patches/2216674/?format=api
{ "id": 2216674, "url": "http://patchwork.ozlabs.org/api/patches/2216674/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260327035422.4020455-2-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": "<20260327035422.4020455-2-den@valinux.co.jp>", "list_archive_url": null, "date": "2026-03-27T03:54:16", "name": "[v12,1/7] PCI: endpoint: Add auxiliary resource query API", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "86f37004a2d936c7c47c0db676abf947e4d54053", "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/20260327035422.4020455-2-den@valinux.co.jp/mbox/", "series": [ { "id": 497685, "url": "http://patchwork.ozlabs.org/api/series/497685/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=497685", "date": "2026-03-27T03:54:17", "name": "PCI: endpoint: pci-ep-msi: Add embedded doorbell fallback", "version": 12, "mbox": "http://patchwork.ozlabs.org/series/497685/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216674/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216674/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-51248-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=XiOF/Jna8t4zNHuJYK2klo1qxQCLAzs25HB7Vjw7h+c=;\n b=FXuxWrTVegeCkQ6ysX31id/eBrCLWcirO70ApMo1vegloBfmAeAgpk7mRqp9QaXhWVsrucAFbkUX7Ri9KlbPxHvvYz6xZbmhqXJMIjJJEQ8I9Qx4t6Nm23R0eEQ2wxm0fj9vI/VbtweD3S+6a/w63zd6sMJm2Rku0QnPOm2Y3zo=", "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 v12 1/7] PCI: endpoint: Add auxiliary resource query API", "Date": "Fri, 27 Mar 2026 12:54:16 +0900", "Message-ID": "<20260327035422.4020455-2-den@valinux.co.jp>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20260327035422.4020455-1-den@valinux.co.jp>", "References": "<20260327035422.4020455-1-den@valinux.co.jp>", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-ClientProxiedBy": "TY4P301CA0048.JPNP301.PROD.OUTLOOK.COM\n (2603:1096:405:36b::19) 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 c7be07e5-a277-498f-0e69-08de8bb489e8", "X-MS-Exchange-CrossTenant-AuthSource": "TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "27 Mar 2026 03:54:25.8145\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 3vTrALyTvq3F96jDdHHNJ8KeF2tQD7jRi+9LX/RiKM1yVz280bG4vd96sLgrjhROpDZ//0AfhQiuAPSLlVrD9A==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "TY7P286MB7090" }, "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_count_aux_resources() / pci_epc_get_aux_resources() and the\ncorresponding pci_epc_ops callbacks. The count helper returns the number\nof available resources via an output parameter, while the get helper\nfills a caller-provided array of resources described by type, physical\naddress and size, plus type-specific metadata.\n\nSuggested-by: Manivannan Sadhasivam <mani@kernel.org>\nSigned-off-by: Koichiro Den <den@valinux.co.jp>\n---\nChanges in v12:\n - Add pci_epc_count_aux_resources() and pci_epc_ops.count_aux_resources\n - Use pci_epc_function_is_valid() instead of open-coding\n\n drivers/pci/endpoint/pci-epc-core.c | 83 +++++++++++++++++++++++++++++\n include/linux/pci-epc.h | 53 ++++++++++++++++++\n 2 files changed, 136 insertions(+)", "diff": "diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c\nindex 6c3c58185fc5..fded71a19d71 100644\n--- a/drivers/pci/endpoint/pci-epc-core.c\n+++ b/drivers/pci/endpoint/pci-epc-core.c\n@@ -156,6 +156,89 @@ 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_count_aux_resources() - count EPC-provided auxiliary resources\n+ * @epc: EPC device\n+ * @func_no: function number\n+ * @vfunc_no: virtual function number\n+ * @num_resources: returned number of auxiliary resources\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: 0 on success, -EOPNOTSUPP if the backend does not support auxiliary\n+ * resource queries, or another -errno on failure.\n+ */\n+int pci_epc_count_aux_resources(struct pci_epc *epc, u8 func_no, u8 vfunc_no,\n+\t\t\t\tint *num_resources)\n+{\n+\tint ret;\n+\n+\tif (!num_resources)\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->count_aux_resources)\n+\t\treturn -EOPNOTSUPP;\n+\n+\tmutex_lock(&epc->lock);\n+\tret = epc->ops->count_aux_resources(epc, func_no, vfunc_no,\n+\t\t\t\t\t num_resources);\n+\tmutex_unlock(&epc->lock);\n+\n+\treturn ret;\n+}\n+EXPORT_SYMBOL_GPL(pci_epc_count_aux_resources);\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 334c2b7578d0..d8b81fc6ca6a 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 +125,8 @@ 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+ * @count_aux_resources: ops to count controller-owned 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 +158,11 @@ 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(*count_aux_resources)(struct pci_epc *epc, u8 func_no,\n+\t\t\t\t u8 vfunc_no, int *num_resources);\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@@ -339,6 +387,11 @@ 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_count_aux_resources(struct pci_epc *epc, u8 func_no, u8 vfunc_no,\n+\t\t\t\tint *num_resources);\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": [ "v12", "1/7" ] }