• Mathias Koehrer's avatar
    PCI: Update "pci=resource_alignment" documentation · 8b078c60
    Mathias Koehrer authored
    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: default avatarMathias Koehrer <mathias.koehrer@etas.com>
    Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
    8b078c60
kernel-parameters.txt 157 KB