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

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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: David Woodhouse <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
This commit is contained in:
David Woodhouse 2017-04-12 13:25:56 +01:00 • committed by Bjorn Helgaas
commit e854d8b2a8
8 changed files with 26 additions and 12 deletions
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3
arch/microblaze/include/asm/pci.h
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@ -48,7 +48,8 @@ extern int pci_proc_domain(struct pci_bus *bus);
struct vm_area_struct;
/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */
#define HAVE_PCI_MMAP 1
#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);