diff options
| author | David Woodhouse <dwmw@amazon.co.uk> | 2017-04-12 15:25:56 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-04-18 21:02:26 +0300 |
| commit | e854d8b2a82ef76521ad2bed68211fde0511d417 (patch) | |
| tree | a6743218f245ac24fb5f6ca3cdba9fb20684a782 /Documentation/filesystems | |
| parent | 11df19546fe4a6135cdae62e96a1e25b3fabf6ea (diff) | |
| download | linux-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.txt | 3 |
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 |