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Fri, 10 Apr 2026 05:50:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775800262; bh=Jl/CqRDCeCLI+hvaYW9X7cU2GJJVSRyyY/vEVWNYR6U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y9ryeqGMhfUQt6iNjkMXN+tFxZqVheQae+upre/T2m6AjawDlXhjV6HYvVyaI7EGo 2ZpxrTWLNwAHa+rQVcfyucCEuha+govFmDAe3UCLb6/X4E3egZmibWhGz+1sIuZis0 dyp/xArjE2f8Nvtq2b05CuE/K5gPJ9BaNvMidTC81SacrhQvO8poGWvEIiUoSKjAow +Obvt2GnVRLgz/5LB/wWnlcyy72zk/Kfr865EYjx5Oq6vpqexLv85znTJYrpFdJ0s5 nwAGUXr6W43glUhueOuPgN/KMgcr426lM+dlQQnzJkTaREBQ58GRjfejEaZh4FdqB/ Xyxicu/sDHRsA== From: =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= To: Bjorn Helgaas Cc: Bjorn Helgaas , Manivannan Sadhasivam , Lorenzo Pieralisi , Magnus Lindholm , Matt Turner , Richard Henderson , Christophe Leroy , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Dexuan Cui , =?UTF-8?q?Krzysztof=20Ha=C5=82asa?= , Lukas Wunner , "Oliver O'Halloran" , Saurabh Singh Sengar , Shuan He , Srivatsa Bhat , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH 05/20] PCI/sysfs: Add static PCI resource attribute macros Date: Fri, 10 Apr 2026 05:50:25 +0000 Message-ID: <20260410055040.39233-6-kwilczynski@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260410055040.39233-1-kwilczynski@kernel.org> References: <20260410055040.39233-1-kwilczynski@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add three macros for declaring static binary attributes for PCI resource files: - pci_dev_resource_io_attr(), for I/O BAR resources (read/write) - pci_dev_resource_uc_attr(), for memory BAR resources (mmap uncached) - pci_dev_resource_wc_attr(), for write-combine resources (mmap WC) Each macro only sets the callbacks its resource type needs. The I/O macro conditionally includes mmap support via __PCI_RESOURCE_IO_MMAP_ATTRS on architectures where arch_can_pci_mmap_io() is true at compile time (such as PowerPC, SPARC, and Xtensa). Signed-off-by: Krzysztof Wilczyński --- drivers/pci/pci-sysfs.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 6b8c8e62f68a..d29d79be8ee5 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -1220,6 +1220,47 @@ static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj, return pci_resource_io(filp, kobj, attr, buf, off, count, true); } +/* + * generic_file_llseek() consults f_mapping->host to determine + * the file size. As iomem_inode knows nothing about the + * attribute, it's not going to work, so override it as well. + */ +#if arch_can_pci_mmap_io() +# define __PCI_RESOURCE_IO_MMAP_ATTRS \ + .f_mapping = iomem_get_mapping, \ + .llseek = pci_llseek_resource, \ + .mmap = pci_mmap_resource_uc, +#else +# define __PCI_RESOURCE_IO_MMAP_ATTRS +#endif + +#define pci_dev_resource_io_attr(_bar) \ +static const struct bin_attribute dev_resource##_bar##_io_attr = { \ + .attr = { .name = "resource" __stringify(_bar), .mode = 0600 }, \ + .private = (void *)(unsigned long)(_bar), \ + .read = pci_read_resource, \ + .write = pci_write_resource, \ + __PCI_RESOURCE_IO_MMAP_ATTRS \ +} + +#define pci_dev_resource_uc_attr(_bar) \ +static const struct bin_attribute dev_resource##_bar##_uc_attr = { \ + .attr = { .name = "resource" __stringify(_bar), .mode = 0600 }, \ + .private = (void *)(unsigned long)(_bar), \ + .f_mapping = iomem_get_mapping, \ + .llseek = pci_llseek_resource, \ + .mmap = pci_mmap_resource_uc, \ +} + +#define pci_dev_resource_wc_attr(_bar) \ +static const struct bin_attribute dev_resource##_bar##_wc_attr = { \ + .attr = { .name = "resource" __stringify(_bar) "_wc", .mode = 0600 }, \ + .private = (void *)(unsigned long)(_bar), \ + .f_mapping = iomem_get_mapping, \ + .llseek = pci_llseek_resource, \ + .mmap = pci_mmap_resource_wc, \ +} + /** * pci_remove_resource_files - cleanup resource files * @pdev: dev to cleanup -- 2.53.0