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GET /api/patches/2197148/?format=api
{ "id": 2197148, "url": "http://patchwork.ozlabs.org/api/patches/2197148/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260217080601.3808847-10-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": "<20260217080601.3808847-10-den@valinux.co.jp>", "list_archive_url": null, "date": "2026-02-17T08:06:01", "name": "[v8,9/9] PCI: endpoint: pci-ep-msi: Add embedded eDMA doorbell fallback", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "55357f1fd7cc1a6d2d467aed2d6a22da302092d0", "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/20260217080601.3808847-10-den@valinux.co.jp/mbox/", "series": [ { "id": 492390, "url": "http://patchwork.ozlabs.org/api/series/492390/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=492390", "date": "2026-02-17T08:05:52", "name": "PCI: endpoint: pci-ep-msi: Add embedded doorbell fallback", "version": 8, "mbox": "http://patchwork.ozlabs.org/series/492390/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2197148/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2197148/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-47434-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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"Subject": "[PATCH v8 9/9] PCI: endpoint: pci-ep-msi: Add embedded eDMA doorbell\n fallback", "Date": "Tue, 17 Feb 2026 17:06:01 +0900", "Message-ID": "<20260217080601.3808847-10-den@valinux.co.jp>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20260217080601.3808847-1-den@valinux.co.jp>", "References": "<20260217080601.3808847-1-den@valinux.co.jp>", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-ClientProxiedBy": "TYCP286CA0281.JPNP286.PROD.OUTLOOK.COM\n (2603:1096:400:3c9::14) 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": "<mailto:linux-pci+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-pci+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "X-MS-PublicTrafficType": "Email", "X-MS-TrafficTypeDiagnostic": "TY7P286MB7722:EE_|OS7P286MB7132:EE_", 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"X-OriginatorOrg": "valinux.co.jp", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 7c509650-cc41-44a2-f211-08de6dfb6c0c", "X-MS-Exchange-CrossTenant-AuthSource": "TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "17 Feb 2026 08:06:15.0993\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 LG3SrRWUpQvyLZDfhnNiIVsuIsOsqabzbUiayWJBkOgvlYT7AAMPPOqjTweqIXIsRcHPMQSmrLSkrmLieeT65Q==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "OS7P286MB7132" }, "content": "Some endpoint platforms cannot use platform MSI / GIC ITS to implement\nEP-side doorbells. In those cases, EPF drivers cannot provide an\ninterrupt-driven doorbell and often fall back to polling.\n\nAdd an \"embedded\" doorbell backend that uses a controller-integrated\ndoorbell target (e.g. DesignWare integrated eDMA interrupt-emulation\ndoorbell).\n\nThe backend locates the doorbell register and a corresponding Linux IRQ\nvia the EPC aux-resource API. If the doorbell register is already\nexposed via a fixed BAR mapping, provide BAR+offset. Otherwise provide\nthe physical address so EPF drivers can map it into BAR space.\n\nWhen MSI doorbell allocation fails with -ENODEV,\npci_epf_alloc_doorbell() falls back to this embedded backend.\n\nSigned-off-by: Koichiro Den <den@valinux.co.jp>\n---\nChanges since v7:\n - Use designated initializer for consistent styling.\n - Clean up the pci_epf_alloc_doorbell() error path.\n\n drivers/pci/endpoint/pci-ep-msi.c | 96 ++++++++++++++++++++++++++++++-\n 1 file changed, 94 insertions(+), 2 deletions(-)", "diff": "diff --git a/drivers/pci/endpoint/pci-ep-msi.c b/drivers/pci/endpoint/pci-ep-msi.c\nindex 50badffa9d72..66f5a68c81b0 100644\n--- a/drivers/pci/endpoint/pci-ep-msi.c\n+++ b/drivers/pci/endpoint/pci-ep-msi.c\n@@ -6,6 +6,7 @@\n * Author: Frank Li <Frank.Li@nxp.com>\n */\n \n+#include <linux/cleanup.h>\n #include <linux/device.h>\n #include <linux/export.h>\n #include <linux/interrupt.h>\n@@ -36,6 +37,84 @@ static void pci_epf_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg)\n \tpci_epc_put(epc);\n }\n \n+static int pci_epf_alloc_doorbell_embedded(struct pci_epf *epf, u16 num_db)\n+{\n+\tconst struct pci_epc_aux_resource *doorbell = NULL;\n+\tstruct pci_epf_doorbell_msg *msg;\n+\tstruct pci_epc *epc = epf->epc;\n+\tstruct device *dev = &epf->dev;\n+\tint count, ret, i;\n+\tu64 addr;\n+\n+\tcount = pci_epc_get_aux_resources(epc, epf->func_no, epf->vfunc_no,\n+\t\t\t\t\t NULL, 0);\n+\tif (count == -EOPNOTSUPP || count == 0)\n+\t\treturn -ENODEV;\n+\tif (count < 0)\n+\t\treturn count;\n+\n+\tstruct pci_epc_aux_resource *res __free(kfree) =\n+\t\t\t\tkcalloc(count, sizeof(*res), GFP_KERNEL);\n+\tif (!res)\n+\t\treturn -ENOMEM;\n+\n+\tret = pci_epc_get_aux_resources(epc, epf->func_no, epf->vfunc_no,\n+\t\t\t\t\tres, count);\n+\tif (ret == -EOPNOTSUPP || ret == 0)\n+\t\treturn -ENODEV;\n+\tif (ret < 0)\n+\t\treturn ret;\n+\n+\tcount = ret;\n+\n+\tfor (i = 0; i < count; i++) {\n+\t\tif (res[i].type == PCI_EPC_AUX_DOORBELL_MMIO) {\n+\t\t\tif (doorbell) {\n+\t\t\t\tdev_warn(dev,\n+\t\t\t\t\t \"Duplicate DOORBELL_MMIO resource found\\n\");\n+\t\t\t\tcontinue;\n+\t\t\t}\n+\t\t\tdoorbell = &res[i];\n+\t\t}\n+\t}\n+\tif (!doorbell)\n+\t\treturn -ENODEV;\n+\n+\tmsg = kcalloc(num_db, sizeof(*msg), GFP_KERNEL);\n+\tif (!msg)\n+\t\treturn -ENOMEM;\n+\n+\taddr = doorbell->phys_addr;\n+\n+\t/*\n+\t * Embedded doorbell backends (e.g. DesignWare eDMA interrupt emulation)\n+\t * typically provide a single IRQ and do not offer per-doorbell\n+\t * distinguishable address/data pairs. The EPC aux resource therefore\n+\t * exposes one DOORBELL_MMIO entry (u.db_mmio.irq).\n+\t *\n+\t * Still, pci_epf_alloc_doorbell() allows requesting multiple doorbells.\n+\t * For such backends we replicate the same address/data for each entry\n+\t * and mark the IRQ as shared (IRQF_SHARED). Consumers must treat them\n+\t * as equivalent \"kick\" doorbells.\n+\t */\n+\tfor (i = 0; i < num_db; i++)\n+\t\tmsg[i] = (struct pci_epf_doorbell_msg) {\n+\t\t\t.msg.address_lo = (u32)addr,\n+\t\t\t.msg.address_hi = (u32)(addr >> 32),\n+\t\t\t.msg.data = doorbell->u.db_mmio.data,\n+\t\t\t.virq = doorbell->u.db_mmio.irq,\n+\t\t\t.irq_flags = IRQF_SHARED,\n+\t\t\t.type = PCI_EPF_DOORBELL_EMBEDDED,\n+\t\t\t.bar = doorbell->bar,\n+\t\t\t.offset = (doorbell->bar == NO_BAR) ? 0 :\n+\t\t\t\t doorbell->bar_offset,\n+\t\t};\n+\n+\tepf->num_db = num_db;\n+\tepf->db_msg = msg;\n+\treturn 0;\n+}\n+\n static int pci_epf_alloc_doorbell_msi(struct pci_epf *epf, u16 num_db)\n {\n \tstruct pci_epf_doorbell_msg *msg;\n@@ -109,8 +188,21 @@ int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 num_db)\n \tif (!ret)\n \t\treturn 0;\n \n-\tdev_err(dev, \"Failed to allocate doorbell: %d\\n\", ret);\n-\treturn ret;\n+\t/*\n+\t * Fall back to embedded doorbell only when platform MSI is unavailable\n+\t * for this EPC.\n+\t */\n+\tif (ret != -ENODEV)\n+\t\treturn ret;\n+\n+\tret = pci_epf_alloc_doorbell_embedded(epf, num_db);\n+\tif (ret) {\n+\t\tdev_err(dev, \"Failed to allocate doorbell: %d\\n\", ret);\n+\t\treturn ret;\n+\t}\n+\n+\tdev_info(dev, \"Using embedded (DMA) doorbell fallback\\n\");\n+\treturn 0;\n }\n EXPORT_SYMBOL_GPL(pci_epf_alloc_doorbell);\n \n", "prefixes": [ "v8", "9/9" ] }