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GET /api/patches/2223142/?format=api
{ "id": 2223142, "url": "http://patchwork.ozlabs.org/api/patches/2223142/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260414141514.1341429-7-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": "<20260414141514.1341429-7-den@valinux.co.jp>", "list_archive_url": null, "date": "2026-04-14T14:15:13", "name": "[v14,6/7] PCI: endpoint: pci-epf-test: Reuse pre-exposed doorbell targets", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "83c22ef77e4fcbda54bb577520358b6dc3449903", "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/20260414141514.1341429-7-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/2223142/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2223142/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-52499-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=sCJ5Z2AdrnpQvLaiZlI8Zol1cdABaHymgvMXXd2v4fQ=;\n b=ZMmSVWNwsKU3zg/ilsbLTtqdGcjRG7P4HvCk9lzRnI90IF8w0xep1Lckhblqv8nAHE8mKAyQZ4pH3V7sylTxJtouw7Z9E/J/mq82+M2UOYhBgSbPrpe+zBp5icGZv5sYVpshBa6TnBQ+YSWUBIbOfmgdpblGra/ILA3DDJPmpXI=", "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 6/7] PCI: endpoint: pci-epf-test: Reuse pre-exposed\n doorbell targets", "Date": "Tue, 14 Apr 2026 23:15:13 +0900", "Message-ID": "<20260414141514.1341429-7-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": "TYCP286CA0075.JPNP286.PROD.OUTLOOK.COM\n (2603:1096:400:31a::16) 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>", 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", "X-OriginatorOrg": "valinux.co.jp", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n c97429c6-ce84-41b6-eb34-08de9a306ac2", "X-MS-Exchange-CrossTenant-AuthSource": "TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "14 Apr 2026 14:16:27.3844\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 mg6w+9kvlQ05c5WwLulJE3gzedFcCoMHQznUZHdp870rUTQfGUToR/AjPby1ahSI9LD5kVjrrw/EWF13nJpMDw==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "TY3P286MB2529" }, "content": "pci-epf-test advertises the doorbell target to the RC as a BAR number\nand an offset, and the RC rings the doorbell with a single DWORD MMIO\nwrite.\n\nSome doorbell backends may report that the doorbell target is already\nexposed via a platform-owned fixed BAR (db_msg[0].bar/offset). In that\ncase, reuse the pre-exposed window and do not reprogram the BAR with\npci_epc_set_bar().\n\nAlso honor db_msg[0].irq_flags when requesting the doorbell IRQ, and\nonly restore the original BAR mapping on disable if pci-epf-test\nprogrammed it.\n\nTested-by: Niklas Cassel <cassel@kernel.org>\nReviewed-by: Frank Li <Frank.Li@nxp.com>\nSigned-off-by: Koichiro Den <den@valinux.co.jp>\n---\n drivers/pci/endpoint/functions/pci-epf-test.c | 84 +++++++++++++------\n 1 file changed, 57 insertions(+), 27 deletions(-)", "diff": "diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c\nindex 7eb94dffac2d..bdc1bb932aa5 100644\n--- a/drivers/pci/endpoint/functions/pci-epf-test.c\n+++ b/drivers/pci/endpoint/functions/pci-epf-test.c\n@@ -94,6 +94,7 @@ struct pci_epf_test {\n \tbool\t\t\tdma_private;\n \tconst struct pci_epc_features *epc_features;\n \tstruct pci_epf_bar\tdb_bar;\n+\tbool\t\t\tdb_bar_programmed;\n \tsize_t\t\t\tbar_size[PCI_STD_NUM_BARS];\n };\n \n@@ -733,7 +734,9 @@ static void pci_epf_test_enable_doorbell(struct pci_epf_test *epf_test,\n {\n \tu32 status = le32_to_cpu(reg->status);\n \tstruct pci_epf *epf = epf_test->epf;\n+\tstruct pci_epf_doorbell_msg *db;\n \tstruct pci_epc *epc = epf->epc;\n+\tunsigned long irq_flags;\n \tstruct msi_msg *msg;\n \tenum pci_barno bar;\n \tsize_t offset;\n@@ -743,13 +746,28 @@ static void pci_epf_test_enable_doorbell(struct pci_epf_test *epf_test,\n \tif (ret)\n \t\tgoto set_status_err;\n \n-\tmsg = &epf->db_msg[0].msg;\n-\tbar = pci_epc_get_next_free_bar(epf_test->epc_features, epf_test->test_reg_bar + 1);\n-\tif (bar < BAR_0)\n-\t\tgoto err_doorbell_cleanup;\n+\tdb = &epf->db_msg[0];\n+\tmsg = &db->msg;\n+\tepf_test->db_bar_programmed = false;\n+\n+\tif (db->bar != NO_BAR) {\n+\t\t/*\n+\t\t * The doorbell target is already exposed via a platform-owned\n+\t\t * fixed BAR\n+\t\t */\n+\t\tbar = db->bar;\n+\t\toffset = db->offset;\n+\t} else {\n+\t\tbar = pci_epc_get_next_free_bar(epf_test->epc_features,\n+\t\t\t\t\t\tepf_test->test_reg_bar + 1);\n+\t\tif (bar < BAR_0)\n+\t\t\tgoto err_doorbell_cleanup;\n+\t}\n+\n+\tirq_flags = epf->db_msg[0].irq_flags | IRQF_ONESHOT;\n \n \tret = request_threaded_irq(epf->db_msg[0].virq, NULL,\n-\t\t\t\t pci_epf_test_doorbell_handler, IRQF_ONESHOT,\n+\t\t\t\t pci_epf_test_doorbell_handler, irq_flags,\n \t\t\t\t \"pci-ep-test-doorbell\", epf_test);\n \tif (ret) {\n \t\tdev_err(&epf->dev,\n@@ -761,22 +779,30 @@ static void pci_epf_test_enable_doorbell(struct pci_epf_test *epf_test,\n \treg->doorbell_data = cpu_to_le32(msg->data);\n \treg->doorbell_bar = cpu_to_le32(bar);\n \n-\tmsg = &epf->db_msg[0].msg;\n-\tret = pci_epf_align_inbound_addr(epf, bar, ((u64)msg->address_hi << 32) | msg->address_lo,\n-\t\t\t\t\t &epf_test->db_bar.phys_addr, &offset);\n+\tif (db->bar == NO_BAR) {\n+\t\tret = pci_epf_align_inbound_addr(epf, bar,\n+\t\t\t\t\t\t ((u64)msg->address_hi << 32) |\n+\t\t\t\t\t\t msg->address_lo,\n+\t\t\t\t\t\t &epf_test->db_bar.phys_addr,\n+\t\t\t\t\t\t &offset);\n \n-\tif (ret)\n-\t\tgoto err_free_irq;\n+\t\tif (ret)\n+\t\t\tgoto err_free_irq;\n+\t}\n \n \treg->doorbell_offset = cpu_to_le32(offset);\n \n-\tepf_test->db_bar.barno = bar;\n-\tepf_test->db_bar.size = epf->bar[bar].size;\n-\tepf_test->db_bar.flags = epf->bar[bar].flags;\n+\tif (db->bar == NO_BAR) {\n+\t\tepf_test->db_bar.barno = bar;\n+\t\tepf_test->db_bar.size = epf->bar[bar].size;\n+\t\tepf_test->db_bar.flags = epf->bar[bar].flags;\n \n-\tret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no, &epf_test->db_bar);\n-\tif (ret)\n-\t\tgoto err_free_irq;\n+\t\tret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no, &epf_test->db_bar);\n+\t\tif (ret)\n+\t\t\tgoto err_free_irq;\n+\n+\t\tepf_test->db_bar_programmed = true;\n+\t}\n \n \tstatus |= STATUS_DOORBELL_ENABLE_SUCCESS;\n \treg->status = cpu_to_le32(status);\n@@ -806,17 +832,21 @@ static void pci_epf_test_disable_doorbell(struct pci_epf_test *epf_test,\n \tfree_irq(epf->db_msg[0].virq, epf_test);\n \tpci_epf_test_doorbell_cleanup(epf_test);\n \n-\t/*\n-\t * The doorbell feature temporarily overrides the inbound translation\n-\t * to point to the address stored in epf_test->db_bar.phys_addr, i.e.,\n-\t * it calls set_bar() twice without ever calling clear_bar(), as\n-\t * calling clear_bar() would clear the BAR's PCI address assigned by\n-\t * the host. Thus, when disabling the doorbell, restore the inbound\n-\t * translation to point to the memory allocated for the BAR.\n-\t */\n-\tret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no, &epf->bar[bar]);\n-\tif (ret)\n-\t\tgoto set_status_err;\n+\tif (epf_test->db_bar_programmed) {\n+\t\t/*\n+\t\t * The doorbell feature temporarily overrides the inbound translation\n+\t\t * to point to the address stored in epf_test->db_bar.phys_addr, i.e.,\n+\t\t * it calls set_bar() twice without ever calling clear_bar(), as\n+\t\t * calling clear_bar() would clear the BAR's PCI address assigned by\n+\t\t * the host. Thus, when disabling the doorbell, restore the inbound\n+\t\t * translation to point to the memory allocated for the BAR.\n+\t\t */\n+\t\tret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no, &epf->bar[bar]);\n+\t\tif (ret)\n+\t\t\tgoto set_status_err;\n+\n+\t\tepf_test->db_bar_programmed = false;\n+\t}\n \n \tstatus |= STATUS_DOORBELL_DISABLE_SUCCESS;\n \treg->status = cpu_to_le32(status);\n", "prefixes": [ "v14", "6/7" ] }