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GET /api/1.2/patches/2234828/?format=api
{ "id": 2234828, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2234828/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260508043543.217179-25-kwilczynski@kernel.org/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.2/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260508043543.217179-25-kwilczynski@kernel.org>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260508043543.217179-25-kwilczynski@kernel.org/", "date": "2026-05-08T04:35:43", "name": "[v7,24/24] PCI/sysfs: Limit BAR resize attribute scope to platforms with PCI mmap", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "a44876b4a377f9b8dc8fa6db66c1d780ef1ca073", "submitter": { "id": 86709, "url": "http://patchwork.ozlabs.org/api/1.2/people/86709/?format=api", "name": "Krzysztof Wilczyński", "email": "kwilczynski@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260508043543.217179-25-kwilczynski@kernel.org/mbox/", "series": [ { "id": 503322, "url": "http://patchwork.ozlabs.org/api/1.2/series/503322/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=503322", "date": "2026-05-08T04:35:20", "name": "PCI: Convert all dynamic sysfs attributes to static", "version": 7, "mbox": "http://patchwork.ozlabs.org/series/503322/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2234828/comments/", "check": "success", "checks": "http://patchwork.ozlabs.org/api/patches/2234828/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20608-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=pDIZz6JT;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1778215036;\n\tbh=g1Q0Y9xFxmkBFDILfcdAU3XRw5NhqOHXxvlpf+w+W4s=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=pDIZz6JT+F50/NoXuF7lFmNqg8Xpq6ar8JHkiL1odWO86N+rOe8JidqrT7wtsIW3t\n\t 93FSlxaBsR1QokyyJQgywFCxNoHnJN1NdlhT9+bOWnTetGZ0UGfNr2EJYfRxtSa9+7\n\t QafCJBekO6SkU2yTq/Ljkct+pzdCfy1y6YRu75s/pcMlmDhnqoynyxXB9EWN3hAlq+\n\t ShPRwGhnWD94gNzGH+PKAm0G7/pWojPkWZV7fdHaAbDN0ZvvmcR/LehdvcM5/RxpQY\n\t fy+35MGYw1z1BM427XCnE9GzPrIrGwKKUJDZMlUpUYQFHur1LncvYHjphNqfo8qNUB\n\t zzg9mYwpDD3dw==", "From": "=?utf-8?q?Krzysztof_Wilczy=C5=84ski?= <kwilczynski@kernel.org>", "To": "Bjorn Helgaas <bhelgaas@google.com>", "Cc": "Bjorn Helgaas <helgaas@kernel.org>,\n Manivannan Sadhasivam <mani@kernel.org>,\n Lorenzo Pieralisi <lpieralisi@kernel.org>,\n Alex Williamson <alex@shazbot.org>, Magnus Lindholm <linmag7@gmail.com>,\n Matt Turner <mattst88@gmail.com>,\n Richard Henderson <richard.henderson@linaro.org>,\n Christophe Leroy <chleroy@kernel.org>,\n Madhavan Srinivasan <maddy@linux.ibm.com>,\n Michael Ellerman <mpe@ellerman.id.au>, Nicholas Piggin <npiggin@gmail.com>,\n Dexuan Cui <decui@microsoft.com>,\n =?utf-8?q?Krzysztof_Ha=C5=82asa?= <khalasa@piap.pl>,\n Lukas Wunner <lukas@wunner.de>, \"Oliver O'Halloran\" <oohall@gmail.com>,\n Saurabh Singh Sengar <ssengar@microsoft.com>,\n Shuan He <heshuan@bytedance.com>, Srivatsa Bhat <srivatsabhat@microsoft.com>,\n\t=?utf-8?q?Ilpo_J=C3=A4rvinen?= <ilpo.jarvinen@linux.intel.com>,\n linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org,\n linuxppc-dev@lists.ozlabs.org", "Subject": "[PATCH v7 24/24] PCI/sysfs: Limit BAR resize attribute scope to\n platforms with PCI mmap", "Date": "Fri, 8 May 2026 04:35:43 +0000", "Message-ID": "<20260508043543.217179-25-kwilczynski@kernel.org>", "X-Mailer": "git-send-email 2.54.0", "In-Reply-To": "<20260508043543.217179-1-kwilczynski@kernel.org>", "References": "<20260508043543.217179-1-kwilczynski@kernel.org>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit", "X-Spam-Status": "No, score=-0.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "Currently, __resource_resize_store() uses sysfs_remove_groups()\nand sysfs_create_groups() on pci_dev_resource_attr_groups to\ntear down and recreate the resourceN files after a BAR resize,\nso the updated BAR sizes are visible in sysfs.\n\nThe resourceN files only exist on platforms that define\nHAVE_PCI_MMAP or ARCH_GENERIC_PCI_MMAP_RESOURCE. On platforms\nthat define neither, pci_dev_resource_attr_groups is NULL and\nthe sysfs_remove_groups() and sysfs_create_groups() calls in\n__resource_resize_store() become no-ops.\n\nResizable BAR (ReBAR) is a PCI Express extended capability\n(PCI_EXT_CAP_ID_REBAR) that requires PCIe extended config\nspace. Every PCIe-capable architecture defines HAVE_PCI_MMAP\nor ARCH_GENERIC_PCI_MMAP_RESOURCE (via arch headers or the\nasm-generic/pci.h fallback). Architectures without either\nonly support conventional PCI and cannot have any ReBAR-capable\ndevices.\n\nThus, move the resize show and store helpers, the per-BAR attribute\ndefinitions, and the attribute group behind the existing #ifdef\nHAVE_PCI_MMAP || ARCH_GENERIC_PCI_MMAP_RESOURCE guard, and fold the\ngroup reference in pci_dev_groups[] into the existing #if block.\n\nTested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>\nSigned-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>\n---\n drivers/pci/pci-sysfs.c | 4 +++-\n 1 file changed, 3 insertions(+), 1 deletion(-)", "diff": "diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c\nindex f5427bcfb0cc..6099371f67e7 100644\n--- a/drivers/pci/pci-sysfs.c\n+++ b/drivers/pci/pci-sysfs.c\n@@ -1661,6 +1661,7 @@ static const struct attribute_group pci_dev_reset_method_attr_group = {\n \t.is_visible = pci_dev_reset_attr_is_visible,\n };\n \n+#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)\n static ssize_t __resource_resize_show(struct device *dev, int n, char *buf)\n {\n \tstruct pci_dev *pdev = to_pci_dev(dev);\n@@ -1775,6 +1776,7 @@ static const struct attribute_group pci_dev_resource_resize_attr_group = {\n \t.attrs = resource_resize_attrs,\n \t.is_visible = resource_resize_attr_is_visible,\n };\n+#endif\n \n static struct attribute *pci_dev_dev_attrs[] = {\n \t&dev_attr_boot_vga.attr,\n@@ -1849,8 +1851,8 @@ const struct attribute_group *pci_dev_groups[] = {\n \t&pci_dev_resource_io_attr_group,\n \t&pci_dev_resource_uc_attr_group,\n \t&pci_dev_resource_wc_attr_group,\n-#endif\n \t&pci_dev_resource_resize_attr_group,\n+#endif\n \t&pci_dev_config_attr_group,\n \t&pci_dev_rom_attr_group,\n \t&pci_dev_reset_attr_group,\n", "prefixes": [ "v7", "24/24" ] }