On Mon, Mar 20, 2017 at 11:01:59AM +0100, Maarten Lankhorst wrote: > Op 20-03-17 om 09:59 schreef Daniel Vetter: > > But my idea was kinda that we'd do the same for probe -> modeset data > > flows like here for the other way round: Just a bunch of READ_ONCE and > > maybe lookup the edid with rcu too. That way it's clear to anybody that > > probe and modeset are entirely not synchronized. > > Though I think it's beneficial to lock them. if it is. I'm not sure there > are many usecases for parallel modeset vs probe. And if someone does care, > they can use nonblocking modesets, maybe. > > Legacy userspace probably can't do blocking modeset and probe at the same > time, so I don't think it will regress. It can happen - just consider two clients, such as system-logind walking sysfs. Delaying most modesets would not be an issue, except where the modeset is being uses to e.g. changes strides before in the middle of a pageflip sequence. I would welcome kms_flip flip/set/vblank-vs-probe, and definitely should add it to legacy-cursor and legacy-plane as well. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
