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| author | Mathias Koehrer <mathias.koehrer@etas.com> | 2016-08-09 11:33:31 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-08-09 19:59:15 +0300 |
| commit | 8b078c603249239f597dc395ac182667c8e0af9c (patch) | |
| tree | 2e739d947afb3ec057c06083821aaf55510d72a1 /Documentation/PCI | |
| parent | 29b4817d4018df78086157ea3a55c1d9424a7cfc (diff) | |
| download | linux-8b078c603249239f597dc395ac182667c8e0af9c.tar.xz | |
PCI: Update "pci=resource_alignment" documentation
Some uio based PCI drivers, e.g., uio_cif, do not work if the assigned PCI
memory resources are not page aligned. By using the kernel option
"pci=resource_alignment=<align>@<bus>:<slot>.<func>" it is possible to
request page alignment for memory resources of devices.
However, this is cumbersome when using several devices, and the
bus/slot/func addresses may change if devices are added to or removed from
the system.
Extend the "pci=resource_alignment" option so we can specify the relevant
devices via PCI vendor, device, subvendor, and subdevice IDs. The
specification of the devices via IDs is indicated by a leading string
"pci:" as argument to "pci=resource_alignment".
The format of the specification is
pci:<vendor>:<device>[:<subvendor>:<subdevice>]
Examples:
pci=resource_alignment=4096@pci:8086:9c22:103c:198f
pci=resource_alignment=pci:8086:9c22 # defaults to PAGE_SIZE align
[bhelgaas: changelog, use actual vendor/device IDs in examples]
Signed-off-by: Mathias Koehrer <mathias.koehrer@etas.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'Documentation/PCI')
0 files changed, 0 insertions, 0 deletions