• Bharat Bhushan's avatar
    vfio/fsl-mc: Add VFIO framework skeleton for fsl-mc devices · fb1ff4c1
    Bharat Bhushan authored
    DPAA2 (Data Path Acceleration Architecture) consists in
    mechanisms for processing Ethernet packets, queue management,
    accelerators, etc.
    
    The Management Complex (mc) is a hardware entity that manages the DPAA2
    hardware resources. It provides an object-based abstraction for software
    drivers to use the DPAA2 hardware. The MC mediates operations such as
    create, discover, destroy of DPAA2 objects.
    The MC provides memory-mapped I/O command interfaces (MC portals) which
    DPAA2 software drivers use to operate on DPAA2 objects.
    
    A DPRC is a container object that holds other types of DPAA2 objects.
    Each object in the DPRC is a Linux device and bound to a driver.
    The MC-bus driver is a platform driver (different from PCI or platform
    bus). The DPRC driver does runtime management of a bus instance. It
    performs the initial scan of the DPRC and handles changes in the DPRC
    configuration (adding/removing objects).
    
    All objects inside a container share the same hardware isolation
    context, meaning that only an entire DPRC can be assigned to
    a virtual machine.
    When a container is assigned to a virtual machine, all the objects
    within that container are assigned to that virtual machine.
    The DPRC container assigned to the virtual machine is not allowed
    to change contents (add/remove objects) by the guest. The restriction
    is set by the host and enforced by the mc hardware.
    
    The DPAA2 objects can be directly assigned to the guest. However
    the MC portals (the memory mapped command interface to the MC) need
    to be emulated because there are commands that configure the
    interrupts and the isolation IDs which are virtual in the guest.
    
    Example:
    echo vfio-fsl-mc > /sys/bus/fsl-mc/devices/dprc.2/driver_override
    echo dprc.2 > /sys/bus/fsl-mc/drivers/vfio-fsl-mc/bind
    
    The dprc.2 is bound to the VFIO driver and all the objects within
    dprc.2 are going to be bound to the VFIO driver.
    
    This patch adds the infrastructure for VFIO support for fsl-mc
    devices. Subsequent patches will add support for binding and secure
    assigning these devices using VFIO.
    
    More details about the DPAA2 objects can be found here:
    Documentation/networking/device_drivers/freescale/dpaa2/overview.rst
    Signed-off-by: default avatarBharat Bhushan <Bharat.Bhushan@nxp.com>
    Signed-off-by: default avatarDiana Craciun <diana.craciun@oss.nxp.com>
    Reviewed-by: default avatarEric Auger <eric.auger@redhat.com>
    Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
    fb1ff4c1
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