On Tue, Sep 3, 2019 at 12:07 PM Daniel Vetter <daniel.vetter@xxxxxxxx> wrote: > > The -modesetting ddx has a totally broken idea of how atomic works: > - doesn't disable old connectors, assuming they get auto-disable like > with the legacy setcrtc > - assumes ASYNC_FLIP is wired through for the atomic ioctl > - not a single call to TEST_ONLY > > Iow the implementation is a 1:1 translation of legacy ioctls to > atomic, which is a) broken b) pointless. > > We already have bugs in both i915 and amdgpu-DC where this prevents us > from enabling neat features. > > If anyone ever cares about atomic in X we can easily add a new atomic > level (req->value == 2) for X to get back the shiny toys. > > Since these broken versions of -modesetting have been shipping, > there's really no other way to get out of this bind. > > References: https://gitlab.freedesktop.org/xorg/xserver/issues/629 > References: https://gitlab.freedesktop.org/xorg/xserver/merge_requests/180 > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> > Cc: Michel Dänzer <michel@xxxxxxxxxxx> > Cc: Alex Deucher <alexdeucher@xxxxxxxxx> > Cc: Adam Jackson <ajax@xxxxxxxxxx> > Cc: Sean Paul <sean@xxxxxxxxxx> > Cc: David Airlie <airlied@xxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx> > --- > drivers/gpu/drm/drm_ioctl.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c > index 2c120c58f72d..1cb7b4c3c87c 100644 > --- a/drivers/gpu/drm/drm_ioctl.c > +++ b/drivers/gpu/drm/drm_ioctl.c > @@ -334,6 +334,9 @@ drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) > file_priv->universal_planes = req->value; > break; > case DRM_CLIENT_CAP_ATOMIC: > + /* The modesetting DDX has a totally broken idea of atomic. */ > + if (strstr(current->comm, "X")) > + return -EOPNOTSUPP; Seems like we can be a bit more targeted than "anything that has 'X' in the name".. at a minimum restrict things to "starts with 'X'" seems saner. But I guess we could probably somehow look at the processes memory map and look for modesetting_drv.so. BR, -R > if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) > return -EOPNOTSUPP; > if (req->value > 1) > -- > 2.23.0 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
