• Dave Airlie's avatar
    drm: add new QXL driver. (v1.4) · f64122c1
    Dave Airlie authored
    QXL is a paravirtual graphics device used by the Spice virtual desktop
    interface.
    
    The drivers uses GEM and TTM to manage memory, the qxl hw fencing however
    is quite different than normal TTM expects, we have to keep track of a number
    of non-linear fence ids per bo that we need to have released by the hardware.
    
    The releases are freed from a workqueue that wakes up and processes the
    release ring.
    
    releases are suballocated from a BO, there are 3 release categories, drawables,
    surfaces and cursor cmds. The hw also has 3 rings for commands, cursor and release handling.
    
    The hardware also have a surface id tracking mechnaism and the driver encapsulates it completely inside the kernel, userspace never sees the actual hw surface
    ids.
    
    This requires a newer version of the QXL userspace driver, so shouldn't be
    enabled until that has been placed into your distro of choice.
    
    Authors: Dave Airlie, Alon Levy
    
    v1.1: fixup some issues in the ioctl interface with padding
    v1.2: add module device table
    v1.3: fix nomodeset, fbcon leak, dumb bo create, release ring irq,
          don't try flush release ring (broken hw), fix -modesetting.
    v1.4: fbcon cpu usage reduction + suitable accel flags.
    Signed-off-by: default avatarAlon Levy <alevy@redhat.com>
    Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
    f64122c1
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