Quoting Mika Kuoppala (2020-05-13 10:32:37) > Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes: > > > Upon gt resume, we first poison then sanitize the engine. However, our > > testing shows that gen9 will very rarely retain the poisoned value from > > the HWSP mappings of the execlists status registers. This suggests that > > it is reading back from the HWSP, so rejig the register reset. > > > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > Acked-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> It failed in exactly the same way, got past the GEM_BUG_ON(*csb_write != reset_value) and still ended up with *csb_write == 0x5a [90] in process_csb. How it's able to see 0x5a at all is a mystery. We poison, we sanitize, we reset the GPU. The value comes back from out of nowhere. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
