[PATCH v8 19/25] PCI: Add macros for legacy I/O and memory address space sizes
From: Krzysztof Wilczyński <kwilczynski@kernel.org>
Date: 2026-06-19 08:53:14
Also in:
linux-alpha, linux-pci
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
Add defines for the standard PCI legacy address space sizes, replacing the raw literals used by the legacy sysfs attributes. Then, replace open-coded values with the newly added macros. No functional changes intended. Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Tested-by: Shivaprasad G Bhat <redacted> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> --- drivers/pci/pci-sysfs.c | 4 ++-- include/linux/pci.h | 5 +++++ 2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 9d1378700c3a..b8986a735a46 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c@@ -1019,7 +1019,7 @@ void pci_create_legacy_files(struct pci_bus *b) sysfs_bin_attr_init(b->legacy_io); b->legacy_io->attr.name = "legacy_io"; - b->legacy_io->size = 0xffff; + b->legacy_io->size = PCI_LEGACY_IO_SIZE; b->legacy_io->attr.mode = 0600; b->legacy_io->read = pci_read_legacy_io; b->legacy_io->write = pci_write_legacy_io;
@@ -1036,7 +1036,7 @@ void pci_create_legacy_files(struct pci_bus *b) b->legacy_mem = b->legacy_io + 1; sysfs_bin_attr_init(b->legacy_mem); b->legacy_mem->attr.name = "legacy_mem"; - b->legacy_mem->size = 1024*1024; + b->legacy_mem->size = PCI_LEGACY_MEM_SIZE; b->legacy_mem->attr.mode = 0600; b->legacy_mem->mmap = pci_mmap_legacy_mem; /* See pci_create_attr() for motivation */
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c56f2cf0d2ab..e37677a8dd3c 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h@@ -27,6 +27,7 @@ #include <linux/mod_devicetable.h> #include <linux/types.h> +#include <linux/sizes.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/list.h>
@@ -1169,6 +1170,10 @@ enum { /* These external functions are only available when PCI support is enabled */ #ifdef CONFIG_PCI +/* PCI legacy I/O port and memory address space sizes. */ +#define PCI_LEGACY_IO_SIZE (SZ_64K - 1) +#define PCI_LEGACY_MEM_SIZE SZ_1M + extern unsigned int pci_flags; static inline void pci_set_flags(int flags) { pci_flags = flags; }
--
2.54.0