From: Krzysztof Wilczyński <kwilczynski@kernel.org>
Date: Fri, 8 May 2026 04:35:38 +0000 (+0000)
Subject: PCI: Add macros for legacy I/O and memory address space sizes
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e52e497e3778c99c3fb26ef6a47af6a219133f8c;p=thirdparty%2Flinux.git

PCI: Add macros for legacy I/O and memory address space sizes

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>
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/20260508043543.217179-20-kwilczynski@kernel.org
---

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 97a482d6d67d..1e60f072f746 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; }