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Commit e854d8b2 authored by David Woodhouse's avatar David Woodhouse Committed by Bjorn Helgaas
Browse files

PCI: Add arch_can_pci_mmap_io() on architectures which can mmap() I/O space 



This is relatively esoteric, and knowing that we don't have it makes life
easier in some cases rather than just an eventual -EINVAL from
pci_mmap_page_range().

Signed-off-by: default avatarDavid Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 11df1954

Documentation/filesystems/sysfs-pci.txt

+2 −1
Original line number Diff line number Diff line
@@ -119,7 +119,8 @@ useful return codes should be provided. 


Platforms which support write-combining maps of PCI resources must define

arch_can_pci_mmap_wc() which shall evaluate to non-zero at runtime when

write-combining is permitted.

write-combining is permitted. Platforms which support maps of I/O resources

define arch_can_pci_mmap_io() similarly.



Legacy resources are protected by the HAVE_PCI_LEGACY define.  Platforms

wishing to support legacy functionality should define it and provide

arch/microblaze/include/asm/pci.h

+2 −1
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ struct vm_area_struct; 


/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */

#define HAVE_PCI_MMAP		1

#define arch_can_pci_mmap_io()	1



extern int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val,

			   size_t count);

arch/powerpc/include/asm/pci.h

+1 −0
Original line number Diff line number Diff line
@@ -80,6 +80,7 @@ struct vm_area_struct; 


/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() and it does WC */

#define HAVE_PCI_MMAP		1

#define arch_can_pci_mmap_io()	1

#define arch_can_pci_mmap_wc()	1



extern int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val,

arch/sparc/include/asm/pci_64.h

+1 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ static inline int pci_proc_domain(struct pci_bus *bus) 
/* Platform support for /proc/bus/pci/X/Y mmap()s. */



#define HAVE_PCI_MMAP

#define arch_can_pci_mmap_io()	1

#define HAVE_ARCH_PCI_GET_UNMAPPED_AREA

#define get_pci_unmapped_area get_fb_unmapped_area

arch/xtensa/include/asm/pci.h

+2 −1
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ struct pci_dev; 


/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */

#define HAVE_PCI_MMAP		1

#define arch_can_pci_mmap_io()	1



#endif /* __KERNEL__ */