Eric Lee / smarc-fsl-linux-kernel

16 Sep, 2009

1 commit

  • ccb86a690   uio: add generic driver for PCI 2.3 devices ... Browse Code ยป

    This adds a generic uio driver that can bind to any PCI device. First
    user will be virtualization where a qemu userspace process needs to give
    guest OS access to the device.

    Interrupts are handled using the Interrupt Disable bit in the PCI
    command register and Interrupt Status bit in the PCI status register.
    All devices compliant to PCI 2.3 (circa 2002) and all compliant PCI
    Express devices should support these bits. Driver detects this support,
    and won't bind to devices which do not support the Interrupt Disable Bit
    in the command register.

    It's expected that more features of interest to virtualization will be
    added to this driver in the future. Possibilities are: mmap for device
    resources, MSI/MSI-X, eventfd (to interface with kvm), iommu.

    Signed-off-by: Michael S. Tsirkin
    Acked-by: Chris Wright
    Signed-off-by: Hans J. Koch
    Acked-by: Jesse Barnes
    Signed-off-by: Greg Kroah-Hartman

    Michael S. Tsirkin