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GET /api/patches/2196638/?format=api
{ "id": 2196638, "url": "http://patchwork.ozlabs.org/api/patches/2196638/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260215163847.3522572-8-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": "<20260215163847.3522572-8-den@valinux.co.jp>", "list_archive_url": null, "date": "2026-02-15T16:38:45", "name": "[v7,7/9] PCI: endpoint: pci-epf-vntb: Reuse pre-exposed doorbells and IRQ flags", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "ceb547ea3d8f5ffbfa8f8c2dce9c0b3c47b782b9", "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/20260215163847.3522572-8-den@valinux.co.jp/mbox/", "series": [ { "id": 492228, "url": "http://patchwork.ozlabs.org/api/series/492228/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=492228", "date": "2026-02-15T16:38:38", "name": "PCI: endpoint: pci-ep-msi: Add embedded doorbell fallback", "version": 7, "mbox": "http://patchwork.ozlabs.org/series/492228/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2196638/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196638/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-47318-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=04ePWOerBr97ddJ4O89veffYXwDywyEvkQuXQcQjPK4=;\n b=giLtC9hOurA/jAl3ahPOj22Fltbuq13SGmLrmiBxfsLwa0w7E2MCOWogiiQ19DTV8yth0YbBxod1SeFgK7XhO6LW8qwrkjEzWQ5uBzsvkMe2PZe8W7j+85BaL5waG7kHkBCC0E1+HFMM0f8rDH7OnpuZGH+mkAPfOxAYscrSSvI=", "From": "Koichiro Den <den@valinux.co.jp>", "To": "jingoohan1@gmail.com,\n\tmani@kernel.org,\n\tlpieralisi@kernel.org,\n\tkwilczynski@kernel.org,\n\trobh@kernel.org,\n\tbhelgaas@google.com,\n\theiko@sntech.de,\n\tkishon@kernel.org,\n\tjdmason@kudzu.us,\n\tdave.jiang@intel.com,\n\tallenbh@gmail.com,\n\tcassel@kernel.org,\n\tshawn.lin@rock-chips.com,\n\tFrank.Li@nxp.com", "Cc": "linux-pci@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tlinux-arm-kernel@lists.infradead.org,\n\tlinux-rockchip@lists.infradead.org,\n\tntb@lists.linux.dev", "Subject": "[PATCH v7 7/9] PCI: endpoint: pci-epf-vntb: Reuse pre-exposed\n doorbells and IRQ flags", "Date": "Mon, 16 Feb 2026 01:38:45 +0900", "Message-ID": "<20260215163847.3522572-8-den@valinux.co.jp>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20260215163847.3522572-1-den@valinux.co.jp>", "References": "<20260215163847.3522572-1-den@valinux.co.jp>", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-ClientProxiedBy": "TY4PR01CA0005.jpnprd01.prod.outlook.com\n (2603:1096:405:26e::8) 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_|OSCP286MB5196:EE_", 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"X-OriginatorOrg": "valinux.co.jp", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 399e6cb3-f615-4708-7b0e-08de6cb0bd2d", "X-MS-Exchange-CrossTenant-AuthSource": "TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "15 Feb 2026 16:39:07.7504\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 DCCBtbSh+cXZr/xSjLC3o6UOqc5YdLnUypQyKBwBmi7lEFNBg096dwe4VDXQDW5i8wmb9eXV036fmc7YWw3SCg==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "OSCP286MB5196" }, "content": "Support doorbell backends where the doorbell target is already exposed\nvia a platform-owned fixed BAR mapping and/or where the doorbell IRQ\nmust be requested with specific flags.\n\nWhen pci_epf_alloc_doorbell() provides db_msg[].bar/offset, reuse the\npre-exposed BAR window and skip programming a new inbound mapping. Also\nhonor db_msg[].irq_flags when requesting the doorbell IRQ.\n\nFor embedded doorbells (e.g. interrupt-emulation), multiple doorbells\nmay share a single address/data pair and a single Linux IRQ. Avoid\nrequesting duplicate handlers by requesting only one IRQ in that case.\n\nSigned-off-by: Koichiro Den <den@valinux.co.jp>\n---\n drivers/pci/endpoint/functions/pci-epf-vntb.c | 57 +++++++++++++++++--\n 1 file changed, 52 insertions(+), 5 deletions(-)", "diff": "diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c\nindex 20efa27325f1..39ba4d6b7d8d 100644\n--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c\n+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c\n@@ -134,6 +134,11 @@ struct epf_ntb {\n \tu16 vntb_vid;\n \n \tbool linkup;\n+\n+\t/*\n+\t * True when doorbells are interrupt-driven (MSI or embedded), false\n+\t * when polled.\n+\t */\n \tbool msi_doorbell;\n \tu32 spad_size;\n \n@@ -523,7 +528,7 @@ static int epf_ntb_db_bar_init_msi_doorbell(struct epf_ntb *ntb,\n \t\t\t\t\t enum pci_barno barno)\n {\n \tstruct pci_epf *epf = ntb->epf;\n-\tunsigned int req;\n+\tunsigned int req, cnt;\n \tdma_addr_t low, high;\n \tstruct msi_msg *msg;\n \tsize_t sz;\n@@ -534,9 +539,29 @@ static int epf_ntb_db_bar_init_msi_doorbell(struct epf_ntb *ntb,\n \tif (ret)\n \t\treturn ret;\n \n-\tfor (req = 0; req < ntb->db_count; req++) {\n+\t/*\n+\t * The doorbell target may already be exposed by a platform-owned fixed\n+\t * BAR. In that case, we must reuse it and the requested db_bar must\n+\t * match.\n+\t */\n+\tif (epf->db_msg[0].bar != NO_BAR && epf->db_msg[0].bar != barno) {\n+\t\tret = -EINVAL;\n+\t\tgoto err_free_doorbell;\n+\t}\n+\n+\t/*\n+\t * For PCI_EPF_DOORBELL_EMBEDDED, the backend may provide a single MMIO\n+\t * address/data pair and a single Linux IRQ even if multiple doorbells\n+\t * were requested. Avoid requesting duplicate handlers in that case.\n+\t */\n+\tcnt = ntb->db_count;\n+\tif (epf->db_msg[0].type == PCI_EPF_DOORBELL_EMBEDDED)\n+\t\tcnt = 1;\n+\n+\tfor (req = 0; req < cnt; req++) {\n \t\tret = request_irq(epf->db_msg[req].virq, epf_ntb_doorbell_handler,\n-\t\t\t\t 0, \"pci_epf_vntb_db\", ntb);\n+\t\t\t\t epf->db_msg[req].irq_flags, \"pci_epf_vntb_db\",\n+\t\t\t\t ntb);\n \n \t\tif (ret) {\n \t\t\tdev_err(&epf->dev,\n@@ -546,6 +571,22 @@ static int epf_ntb_db_bar_init_msi_doorbell(struct epf_ntb *ntb,\n \t\t}\n \t}\n \n+\tif (epf->db_msg[0].bar != NO_BAR) {\n+\t\tfor (i = 0; i < ntb->db_count; i++) {\n+\t\t\tmsg = &epf->db_msg[i].msg;\n+\n+\t\t\tif (epf->db_msg[i].bar != barno) {\n+\t\t\t\tret = -EINVAL;\n+\t\t\t\tgoto err_free_irq;\n+\t\t\t}\n+\n+\t\t\tntb->reg->db_data[i] = msg->data;\n+\t\t\tntb->reg->db_offset[i] = epf->db_msg[i].offset;\n+\t\t}\n+\t\tgoto out;\n+\t}\n+\n+\t/* Program inbound mapping for the doorbell */\n \tmsg = &epf->db_msg[0].msg;\n \n \thigh = 0;\n@@ -592,6 +633,7 @@ static int epf_ntb_db_bar_init_msi_doorbell(struct epf_ntb *ntb,\n \t\tntb->reg->db_offset[i] = offset;\n \t}\n \n+out:\n \tntb->reg->db_entry_size = 0;\n \n \tntb->msi_doorbell = true;\n@@ -602,6 +644,7 @@ static int epf_ntb_db_bar_init_msi_doorbell(struct epf_ntb *ntb,\n \twhile (req)\n \t\tfree_irq(epf->db_msg[--req].virq, ntb);\n \n+err_free_doorbell:\n \tpci_epf_free_doorbell(ntb->epf);\n \treturn ret;\n }\n@@ -665,9 +708,13 @@ static void epf_ntb_db_bar_clear(struct epf_ntb *ntb)\n \tenum pci_barno barno;\n \n \tif (ntb->msi_doorbell) {\n-\t\tint i;\n+\t\tunsigned int cnt = ntb->db_count;\n+\t\tunsigned int i;\n \n-\t\tfor (i = 0; i < ntb->db_count; i++)\n+\t\tif (ntb->epf->db_msg[0].type == PCI_EPF_DOORBELL_EMBEDDED)\n+\t\t\tcnt = 1;\n+\n+\t\tfor (i = 0; i < cnt; i++)\n \t\t\tfree_irq(ntb->epf->db_msg[i].virq, ntb);\n \t}\n \n", "prefixes": [ "v7", "7/9" ] }