Chris Wilson <ch...@chris-wilson.co.uk> writes: > Quoting Mika Kuoppala (2020-05-08 16:37:15) >> Chris Wilson <ch...@chris-wilson.co.uk> writes: >> >> > The downside of using semaphores is that we lose metadata passing >> > along the signaling chain. This is particularly nasty when we >> > need to pass along a fatal error such as EFAULT or EDEADLK. For >> > fatal errors we want to scrub the request before it is executed, >> > which means that we cannot preload the request onto HW and have >> > it wait upon a semaphore. >> >> b is waiting on a, a fails and we want to release b with error? > > Yes. B is submitted before A, and if B is relying on A to setup GPU page
I guess this has to be A is before B. > tables or other interesting things, we can't let B run if A dies. For > the EDEADLK if B is waiting on A, but then A is submitted with a wait on > B -- we have to untangle that mess. Avoiding the hw semaphore makes sense Reviewed-by: Mika Kuoppala <mika.kuopp...@linux.intel.com> > -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
