diff options
| author | David Woodhouse <dwmw@amazon.co.uk> | 2017-04-12 14:25:59 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-04-20 15:47:47 +0200 |
| commit | f719582435afe9c7985206e42d804ea6aa315d33 (patch) | |
| tree | 0f0ea2ee1adc77e1e81c1410e5569e5d6136ffb6 /Documentation/filesystems | |
| parent | PCI: Add BAR index argument to pci_mmap_page_range() (diff) | |
| download | linux-f719582435afe9c7985206e42d804ea6aa315d33.tar.xz linux-f719582435afe9c7985206e42d804ea6aa315d33.zip | |
PCI: Add pci_mmap_resource_range() and use it for ARM64
Starting to leave behind the legacy of the pci_mmap_page_range() interface
which takes "user-visible" BAR addresses. This takes just the resource and
offset.
For now, both APIs coexist and depending on the platform, one is
implemented as a wrapper around the other.
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 | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/Documentation/filesystems/sysfs-pci.txt b/Documentation/filesystems/sysfs-pci.txt index 46b95d82c4fd..06f1d64c6f70 100644 --- a/Documentation/filesystems/sysfs-pci.txt +++ b/Documentation/filesystems/sysfs-pci.txt @@ -113,9 +113,13 @@ Supporting PCI access on new platforms -------------------------------------- In order to support PCI resource mapping as described above, Linux platform -code must define HAVE_PCI_MMAP and provide a pci_mmap_page_range function. -Platforms are free to only support subsets of the mmap functionality, but -useful return codes should be provided. +code should ideally define ARCH_GENERIC_PCI_MMAP_RESOURCE and use the generic +implementation of that functionality. To support the historical interface of +mmap() through files in /proc/bus/pci, platforms may also set HAVE_PCI_MMAP. + +Alternatively, platforms which set HAVE_PCI_MMAP may provide their own +implementation of pci_mmap_page_range() instead of defining +ARCH_GENERIC_PCI_MMAP_RESOURCE. 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 |