[PATCH v5 18/23] PCI/sysfs: Remove pci_{create,remove}_sysfs_dev_files()

Krzysztof Wilczyński
2026-04-16T18:02:16Z

Currently, pci_create_sysfs_dev_files() and pci_remove_sysfs_dev_files()
are no-op stubs. With both the generic and Alpha resource files now
handled by static attribute groups, no platform needs dynamic per-device
sysfs file creation.

Thus, remove both functions, their declarations, and the call sites in
pci_bus_add_device() and pci_stop_bus_device().

Remove __weak pci_create_resource_files() and pci_remove_resource_files()
stubs and their declarations in pci.h, as no architecture overrides them
anymore.

Remove the res_attr[] and res_attr_wc[] fields from struct pci_dev
which were used to track dynamically allocated resource attributes.

Finally, simplify pci_sysfs_init() to only handle legacy file creation
under HAVE_PCI_LEGACY, removing the per-device loop and the
HAVE_PCI_SYSFS_INIT helper added earlier.

Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
---
drivers/pci/bus.c | 1 -
drivers/pci/pci-sysfs.c | 52 ++---------------------------------------
drivers/pci/pci.h | 4 ----
drivers/pci/remove.c | 1 -
include/linux/pci.h | 9 -------
5 files changed, 2 insertions(+), 65 deletions(-)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 6c1ad1f542d9..655ed53436d3 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -354,7 +354,6 @@ void pci_bus_add_device(struct pci_dev *dev)
pci_fixup_device(pci_fixup_final, dev);
if (pci_is_bridge(dev))
of_pci_make_dev_node(dev);
- pci_create_sysfs_dev_files(dev);
pci_proc_attach_device(dev);
pci_bridge_d3_update(dev);

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index d22bc5c48bc0..3a7bbb00ca60 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -37,12 +37,7 @@
#define ARCH_PCI_DEV_GROUPS
#endif

-#if defined(HAVE_PCI_LEGACY) || \
- !defined(HAVE_PCI_MMAP) && !defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
-#define HAVE_PCI_SYSFS_INIT
-#endif
-
-#ifdef HAVE_PCI_SYSFS_INIT
+#ifdef HAVE_PCI_LEGACY
static int sysfs_initialized; /* = 0 */
#endif

@@ -1401,8 +1396,6 @@ static const struct attribute_group *pci_dev_resource_attr_groups[] = {
};
#else
#define pci_dev_resource_attr_groups NULL
-int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
-void __weak pci_remove_resource_files(struct pci_dev *dev) { }
#endif

/**
@@ -1772,54 +1765,13 @@ 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)
- return -EACCES;
-
- return pci_create_resource_files(pdev);
-}
-
-/**
- * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
- * @pdev: device whose entries we should free
- *
- * Cleanup when @pdev is removed from sysfs.
- */
-void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
-{
- if (!sysfs_initialized)
- return;
-
- pci_remove_resource_files(pdev);
-}
-#endif
-
-#ifdef HAVE_PCI_SYSFS_INIT
+#ifdef HAVE_PCI_LEGACY
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;

- sysfs_initialized = 1;
- for_each_pci_dev(pdev) {
- retval = pci_create_sysfs_dev_files(pdev);
- if (retval) {
- pci_dev_put(pdev);
- return retval;
- }
- }
-#endif
while ((pbus = pci_find_next_bus(pbus)))
pci_create_legacy_files(pbus);

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 13d998fbacce..1bf165595583 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -391,16 +391,12 @@ static inline int pci_no_d1d2(struct pci_dev *dev)
}

#ifdef CONFIG_SYSFS
-int pci_create_sysfs_dev_files(struct pci_dev *pdev);
-void pci_remove_sysfs_dev_files(struct pci_dev *pdev);
extern const struct attribute_group *pci_dev_groups[];
extern const struct attribute_group *pci_dev_attr_groups[];
extern const struct attribute_group *pcibus_groups[];
extern const struct attribute_group *pci_bus_groups[];
extern const struct attribute_group pci_doe_sysfs_group;
#else
-static inline int pci_create_sysfs_dev_files(struct pci_dev *pdev) { return 0; }
-static inline void pci_remove_sysfs_dev_files(struct pci_dev *pdev) { }
#define pci_dev_groups NULL
#define pci_dev_attr_groups NULL
#define pcibus_groups NULL
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index e9d519993853..6e796dbc5b29 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -26,7 +26,6 @@ static void pci_stop_dev(struct pci_dev *dev)

device_release_driver(&dev->dev);
pci_proc_detach_device(dev);
- pci_remove_sysfs_dev_files(dev);
of_pci_remove_node(dev);
}

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 30aeb8e02b7b..f6f55005f82d 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -507,10 +507,6 @@ 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 */
@@ -2528,11 +2524,6 @@ 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);
void __init pci_mmcfg_late_init(void);
--
2.53.0