On 11.06.2013 15:09, Daniel Vetter wrote: > Maybe it wasn't clear, but -EAGAIN does _not_ resubmit work. -EAGAIN > is used to restart the ioctl if we had to kick a thread (to make sure > it doesn't hold any locks), e.g. for a blocking wait on oustanding > rendering. The codepaths taken work exactly as if the thread is > interrupt with a signal. You did make it clear that there's no resubmission, but other parts confused me. So this is used so that a legacy driver which does not do fine-grained locking can interrupt all waits for completion for a wedged submit. This way a driver-wide lock get unlocked, cleanup code acquires locks, does the magic to unwedge GPU, and unlocks. Then user space can re-submit the waits as it got -EAGAIN. Fortunately the error code doesn't really matter as long as it's not EAGAIN, so we can just use ETIMEDOUT as Thierry suggested in his follow-up. Terje _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
