[PATCH v8 09/25] PCI/sysfs: Add stubs for pci_{create,remove}_sysfs_dev_files()
From: Krzysztof Wilczyński <kwilczynski@kernel.org>
Date: 2026-06-19 08:52:37
Also in:
linux-alpha, linux-pci
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
On platforms with HAVE_PCI_MMAP or ARCH_GENERIC_PCI_MMAP_RESOURCE, resource files are now handled by static attribute groups registered via pci_dev_groups[]. Thus, the pci_create_sysfs_dev_files() and pci_remove_sysfs_dev_files() can now be stubbed out, as the dynamic resource file creation is no longer needed. Also, simplify pci_sysfs_init() on these platforms to only iterate buses for legacy attributes creation, skipping the per-device loop. Move the __weak stubs for pci_create_resource_files() and pci_remove_resource_files() into the #else branch since only platforms without HAVE_PCI_MMAP (such as Alpha architecture) still need them. Guard the res_attr[] and res_attr_wc[] fields in struct pci_dev the same way. Tested-by: Shivaprasad G Bhat <redacted> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> --- drivers/pci/pci-sysfs.c | 15 ++++++++++++--- include/linux/pci.h | 4 ++++ 2 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index b8b7fb809c69..208ec7057b50 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c@@ -1370,10 +1370,9 @@ static const struct attribute_group *pci_dev_resource_attr_groups[] = { }; #else #define pci_dev_resource_attr_groups NULL -#endif - int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; } void __weak pci_remove_resource_files(struct pci_dev *dev) { } +#endif /** * pci_write_rom - used to enable access to the PCI ROM display
@@ -1742,6 +1741,10 @@ static const struct attribute_group pci_dev_resource_resize_attr_group = { .is_visible = resource_resize_attr_is_visible, }; +#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE) +int pci_create_sysfs_dev_files(struct pci_dev *pdev) { return 0; } +void pci_remove_sysfs_dev_files(struct pci_dev *pdev) { } +#else int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev) { if (!sysfs_initialized)
@@ -1763,9 +1766,15 @@ void pci_remove_sysfs_dev_files(struct pci_dev *pdev) pci_remove_resource_files(pdev); } +#endif static int __init pci_sysfs_init(void) { +#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE) + struct pci_bus *pbus = NULL; + + sysfs_initialized = 1; +#else struct pci_dev *pdev = NULL; struct pci_bus *pbus = NULL; int retval;
@@ -1778,7 +1787,7 @@ static int __init pci_sysfs_init(void) return retval; } } - +#endif while ((pbus = pci_find_next_bus(pbus))) pci_create_legacy_files(pbus);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 974605c9fce2..b998a56f6010 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h@@ -515,8 +515,10 @@ struct pci_dev { spinlock_t pcie_cap_lock; /* Protects RMW ops in capability accessors */ u32 saved_config_space[16]; /* Config space saved at suspend time */ struct hlist_head saved_cap_space; +#if !defined(HAVE_PCI_MMAP) && !defined(ARCH_GENERIC_PCI_MMAP_RESOURCE) struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */ struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */ +#endif #ifdef CONFIG_HOTPLUG_PCI_PCIE unsigned int broken_cmd_compl:1; /* No compl for some cmds */
@@ -2531,8 +2533,10 @@ int pcibios_alloc_irq(struct pci_dev *dev); void pcibios_free_irq(struct pci_dev *dev); resource_size_t pcibios_default_alignment(void); +#if !defined(HAVE_PCI_MMAP) && !defined(ARCH_GENERIC_PCI_MMAP_RESOURCE) extern int pci_create_resource_files(struct pci_dev *dev); extern void pci_remove_resource_files(struct pci_dev *dev); +#endif #if defined(CONFIG_PCI_MMCONFIG) || defined(CONFIG_ACPI_MCFG) void __init pci_mmcfg_early_init(void);
--
2.54.0