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PCI/sysfs: Add static PCI resource attribute macros

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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 <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://patch.msgid.link/20260508043543.217179-7-kwilczynski@kernel.org
This commit is contained in:
Krzysztof Wilczyński 2026-05-08 04:35:25 +00:00 committed by Bjorn Helgaas
parent 25ec7f57de
commit b15ac7e008
1 changed files with 41 additions and 0 deletions
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41
drivers/pci/pci-sysfs.c
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@ -1197,6 +1197,47 @@ 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_io, \
.write = pci_write_resource_io, \
__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