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GET /api/patches/2196632/?format=api
{ "id": 2196632, "url": "http://patchwork.ozlabs.org/api/patches/2196632/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260215163847.3522572-2-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": "<20260215163847.3522572-2-den@valinux.co.jp>", "list_archive_url": null, "date": "2026-02-15T16:38:39", "name": "[v7,1/9] PCI: endpoint: Describe reserved subregions within BARs", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "1cdd8777ae989d4446caac36d2e8627b3faf7109", "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/20260215163847.3522572-2-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/2196632/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196632/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-47312-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=XFcVKHil3Cz9aiQkWsEZEXTsG4xoIsNXs+oJdexGnc0=;\n b=YT3pUkFdSVduNGlWt9jZjc27Qt5IVehXLEqCZyiJmMfbV9SRZdIokP+H8ygc5YHlD/OA6XGOYI0/F6WhazBQqz12mwpWQdi0RGab32FUcwl+yeFTOh/ijufZrJKr3pPaK5jNhxyqKBCjxUBWSdfsKXAbYVGmLJmnq5mlvAkJ1RU=", "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 1/9] PCI: endpoint: Describe reserved subregions within\n BARs", "Date": "Mon, 16 Feb 2026 01:38:39 +0900", "Message-ID": "<20260215163847.3522572-2-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": "TYCP301CA0034.JPNP301.PROD.OUTLOOK.COM\n (2603:1096:400:380::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_|OSCP286MB5196:EE_", "X-MS-Office365-Filtering-Correlation-Id": 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", "X-OriginatorOrg": "valinux.co.jp", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n d349f38c-cf22-4fce-08cd-08de6cb0ba0b", "X-MS-Exchange-CrossTenant-AuthSource": "TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "15 Feb 2026 16:39:02.4879\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 eWgApkOG9Ul7jokMEUWw59KchXHAddxVr/CUpdEFtEzvgdLYcnXfnn2tXkA5dC76gQptbtsyQFKXo5/qCR+0sA==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "OSCP286MB5196" }, "content": "Some endpoint controllers expose platform-owned, fixed register windows\nwithin a BAR that EPF drivers must not reprogram (e.g. a BAR marked\nBAR_RESERVED). Even in that case, EPF drivers may need to reference a\nwell-defined subset of that BAR, e.g. to reuse an integrated DMA\ncontroller MMIO window as a doorbell target.\n\nIntroduce struct pci_epc_bar_rsvd_region and extend struct\npci_epc_bar_desc so EPC drivers can advertise such fixed subregions in a\ncontroller-agnostic way.\n\nNo functional change for existing users.\n\nSigned-off-by: Koichiro Den <den@valinux.co.jp>\n---\n include/linux/pci-epc.h | 28 ++++++++++++++++++++++++++++\n 1 file changed, 28 insertions(+)", "diff": "diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h\nindex c021c7af175f..7a87f5962dd0 100644\n--- a/include/linux/pci-epc.h\n+++ b/include/linux/pci-epc.h\n@@ -200,6 +200,30 @@ enum pci_epc_bar_type {\n \tBAR_RESERVED,\n };\n \n+/**\n+ * enum pci_epc_bar_rsvd_region_type - type of a fixed subregion behind a BAR\n+ * @PCI_EPC_BAR_RSVD_DMA_CTRL_MMIO: Integrated DMA controller MMIO window\n+ *\n+ * BARs marked BAR_RESERVED are owned by the SoC/EPC hardware and must not be\n+ * reprogrammed by EPF drivers. Some of them still expose fixed subregions that\n+ * EPFs may want to reference (e.g. embedded doorbell fallback).\n+ */\n+enum pci_epc_bar_rsvd_region_type {\n+\tPCI_EPC_BAR_RSVD_DMA_CTRL_MMIO = 0,\n+};\n+\n+/**\n+ * struct pci_epc_bar_rsvd_region - fixed subregion behind a BAR\n+ * @type: reserved region type\n+ * @offset: offset within the BAR aperture\n+ * @size: size of the reserved region\n+ */\n+struct pci_epc_bar_rsvd_region {\n+\tenum pci_epc_bar_rsvd_region_type\ttype;\n+\tresource_size_t\t\t\t\toffset;\n+\tresource_size_t\t\t\t\tsize;\n+};\n+\n /**\n * struct pci_epc_bar_desc - hardware description for a BAR\n * @type: the type of the BAR\n@@ -213,11 +237,15 @@ enum pci_epc_bar_type {\n *\t\t(If BARx is a 64-bit BAR that an EPF driver is not allowed to\n *\t\ttouch, then both BARx and BARx+1 must be set to type\n *\t\tBAR_RESERVED.)\n+ * @nr_rsvd_regions: number of fixed subregions described for BAR_RESERVED\n+ * @rsvd_regions: fixed subregions behind BAR_RESERVED\n */\n struct pci_epc_bar_desc {\n \tenum pci_epc_bar_type type;\n \tu64 fixed_size;\n \tbool only_64bit;\n+\tu8 nr_rsvd_regions;\n+\tconst struct pci_epc_bar_rsvd_region *rsvd_regions;\n };\n \n /**\n", "prefixes": [ "v7", "1/9" ] }