• Dave Airlie's avatar
    drm/nouveau: add kconfig option to turn off nouveau legacy contexts. (v3) · 1e07d637
    Dave Airlie authored
    commit b30a43ac upstream.
    
    There was a nouveau DDX that relied on legacy context ioctls to work,
    but we fixed it years ago, give distros that have a modern DDX the
    option to break the uAPI and close the mess of holes that legacy
    context support is.
    
    Full context of the story:
    
    commit 0e975980
    Author: Peter Antoine <peter.antoine@intel.com>
    Date:   Tue Jun 23 08:18:49 2015 +0100
    
        drm: Turn off Legacy Context Functions
    
        The context functions are not used by the i915 driver and should not
        be used by modeset drivers. These driver functions contain several bugs
        and security holes. This change makes these functions optional can be
        turned on by a setting, they are turned off by default for modeset
        driver with the exception of the nouvea driver that may require them with
        an old version of libdrm.
    
        The previous attempt was
    
        commit 7c510133
        Author: Daniel Vetter <daniel.vetter@ffwll.ch>
        Date:   Thu Aug 8 15:41:21 2013 +0200
    
            drm: mark context support as a legacy subsystem
    
        but this had to be reverted
    
        commit c21eb21c
        Author: Dave Airlie <airlied@redhat.com>
        Date:   Fri Sep 20 08:32:59 2013 +1000
    
            Revert "drm: mark context support as a legacy subsystem"
    
        v2: remove returns from void function, and formatting (Daniel Vetter)
    
        v3:
        - s/Nova/nouveau/ in the commit message, and add references to the
          previous attempts
        - drop the part touching the drm hw lock, that should be a separate
          patch.
    
        Signed-off-by: Peter Antoine <peter.antoine@intel.com> (v2)
        Cc: Peter Antoine <peter.antoine@intel.com> (v2)
    Reviewed-by: default avatarPeter Antoine <peter.antoine@intel.com>
    Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    
    v2: move DRM_VM dependency into legacy config.
    v3: fix missing dep (kbuild robot)
    
    Cc: stable@vger.kernel.org
    Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    1e07d637
nouveau_drm.c 31.8 KB