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authorDavid Woodhouse <dwmw@amazon.co.uk>2017-04-12 15:25:56 +0300
committerBjorn Helgaas <bhelgaas@google.com>2017-04-18 21:02:26 +0300
commite854d8b2a82ef76521ad2bed68211fde0511d417 (patch)
treea6743218f245ac24fb5f6ca3cdba9fb20684a782 /Documentation/filesystems
parent11df19546fe4a6135cdae62e96a1e25b3fabf6ea (diff)
downloadlinux-e854d8b2a82ef76521ad2bed68211fde0511d417.tar.xz
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: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/sysfs-pci.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/filesystems/sysfs-pci.txt b/Documentation/filesystems/sysfs-pci.txt
index 25b7f1c1b868..46b95d82c4fd 100644
--- a/Documentation/filesystems/sysfs-pci.txt
+++ b/Documentation/filesystems/sysfs-pci.txt
@@ -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