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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
Documentation/filesystems/sysfs-pci.txt
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@ -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