Quoting Chris Wilson (2019-05-02 10:41:19) > Given an immediate preemption event on re-enabling arbitration > (MI_ARB_ON_OFF | MI_ARB_ENABLE) it appears that the HW may forget about > the ongoing MI_USER_INTERRUPT, losing the interrupt in the process. If > we happen to be waiting on that interrupt at the time, the system may > then grind to a halt. > > My presumption is that there is an effective shadow inside the CS as it > parses and buffers the commands, and if we push the MI_USER_INTERRUPT > out of the immediate parse buffer it is not lost by the arbitration > check. > > Testcase: igt/gem_concurrent_blit > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > --- > Plausible? I need a few hours to confirm my hunch. Sadly, it got stuck again. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
