• Jason Ekstrand's avatar
    drm/i915: Drop the CONTEXT_CLONE API (v2) · 4a766ae4
    Jason Ekstrand authored
    This API allows one context to grab bits out of another context upon
    creation.  It can be used as a short-cut for setparam(getparam()) for
    things like I915_CONTEXT_PARAM_VM.  However, it's never been used by any
    real userspace.  It's used by a few IGT tests and that's it.  Since it
    doesn't add any real value (most of the stuff you can CLONE you can copy
    in other ways), drop it.
    
    There is one thing that this API allows you to clone which you cannot
    clone via getparam/setparam: timelines.  However, timelines are an
    implementation detail of i915 and not really something that needs to be
    exposed to userspace.  Also, sharing timelines between contexts isn't
    obviously useful and supporting it has the potential to complicate i915
    internally.  It also doesn't add any functionality that the client can't
    get in other ways.  If a client really wants a shared timeline, they can
    use a syncobj and set it as an in and out fence on every submit.
    
    v2 (Jason Ekstrand):
     - More detailed commit message
    Signed-off-by: default avatarJason Ekstrand <jason@jlekstrand.net>
    Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    Link: https://patchwork.freedesktop.org/patch/msgid/20210708154835.528166-7-jason@jlekstrand.net
    4a766ae4
i915_drm.h 93.2 KB