PCI: Move pci_iomap.c to drivers/pci/

The entirety of pci_iomap.c is guarded by an #ifdef CONFIG_PCI. It,
consequently, does not belong to lib/ because it is not generic
infrastructure.

Move pci_iomap.c to drivers/pci/ and implement the necessary changes to
Makefiles and Kconfigs.

Update MAINTAINERS file.

Update Documentation.

Link: https://lore.kernel.org/r/20240131090023.12331-3-pstanner@redhat.com
[bhelgaas: squash in https://lore.kernel.org/r/20240212150934.24559-1-pstanner@redhat.com]
Suggested-by: Danilo Krummrich <dakr@redhat.com>
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

Documentation/driver-api/device-io.rst

@@ -517,6 +517,3 @@ Public Functions Provided
 
 .. kernel-doc:: arch/x86/include/asm/io.h
    :internal:
-
-.. kernel-doc:: lib/pci_iomap.c
-   :export:

Documentation/driver-api/pci/pci.rst

@@ -4,6 +4,9 @@ PCI Support Library
 .. kernel-doc:: drivers/pci/pci.c
    :export:
 
+.. kernel-doc:: drivers/pci/iomap.c
+   :export:
+
 .. kernel-doc:: drivers/pci/pci-driver.c
    :export:
 

MAINTAINERS

@@ -16954,7 +16954,6 @@ F:	include/asm-generic/pci*
 F:	include/linux/of_pci.h
 F:	include/linux/pci*
 F:	include/uapi/linux/pci*
-F:	lib/pci*
 
 PCIE DRIVER FOR AMAZON ANNAPURNA LABS
 M:	Jonathan Chocron <jonnyc@amazon.com>

drivers/pci/Kconfig

@@ -13,6 +13,11 @@ config FORCE_PCI
 	select HAVE_PCI
 	select PCI
 
+# select this to provide a generic PCI iomap,
+# without PCI itself having to be defined
+config GENERIC_PCI_IOMAP
+	bool
+
 menuconfig PCI
 	bool "PCI support"
 	depends on HAVE_PCI

drivers/pci/Makefile

@@ -14,6 +14,7 @@ ifdef CONFIG_PCI
 obj-$(CONFIG_PROC_FS)		+= proc.o
 obj-$(CONFIG_SYSFS)		+= slot.o
 obj-$(CONFIG_ACPI)		+= pci-acpi.o
+obj-$(CONFIG_GENERIC_PCI_IOMAP) += iomap.o
 endif
 
 obj-$(CONFIG_OF)		+= of.o

drivers/pci/iomap.c

@@ -9,7 +9,6 @@
 
 #include <linux/export.h>
 
-#ifdef CONFIG_PCI
 /**
  * pci_iomap_range - create a virtual mapping cookie for a PCI BAR
  * @dev: PCI device that owns the BAR
@@ -176,5 +175,3 @@ void pci_iounmap(struct pci_dev *dev, void __iomem *p)
 EXPORT_SYMBOL(pci_iounmap);
 
 #endif /* ARCH_WANTS_GENERIC_PCI_IOUNMAP */
-
-#endif /* CONFIG_PCI */

lib/Kconfig

@@ -70,9 +70,6 @@ source "lib/math/Kconfig"
 config NO_GENERIC_PCI_IOPORT_MAP
 	bool
 
-config GENERIC_PCI_IOMAP
-	bool
-
 config GENERIC_IOMAP
 	bool
 	select GENERIC_PCI_IOMAP

lib/Makefile

@@ -153,7 +153,6 @@ CFLAGS_debug_info.o += $(call cc-option, -femit-struct-debug-detailed=any)
 obj-y += math/ crypto/
 
 obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
-obj-$(CONFIG_GENERIC_PCI_IOMAP) += pci_iomap.o
 obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o
 obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o
 obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o