Quoting Daniele Ceraolo Spurio (2021-01-06 17:21:16) > > > On 1/5/2021 6:55 PM, Chris Wilson wrote: > > Quoting Daniele Ceraolo Spurio (2021-01-06 02:32:28) > >> > >> On 1/5/2021 4:58 PM, Chris Wilson wrote: > >>> Quoting Daniele Ceraolo Spurio (2021-01-05 23:19:44) > >>>> GuC owns the execlists state and the context IDs used for submission, so > >>>> the status of the ports and the CSB entries are not something we control > >>>> or can decode from the i915 side, therefore we can avoid dumping it. A > >>>> follow-up patch will also stop setting the csb pointers when using GuC > >>>> submission. > >>>> > >>>> GuC dumps all the required events in the GuC logs when verbosity is set > >>>> high enough. > >>> Would not be worth including, or is it not very helpful for debugging > >>> curious engine stalls? > >> GuC is going to reset the engine if it stalls, so we should get the GuC > >> logs and the engine state included in the error state. > > Here we would be focusing on "why hasn't a request been submitted/executed". > > A bad request is usually self-evident, but a missing one is tricky. > > Agreed, but I still don't think we could use the CSB info even if we > dumped it. We currently can't map CSB events in GuC submission mode to > specific contexts, because the ctx IDs used by the GuC do not map to the > ones used by i915. We've asked the GuC team to expose a way to do such a > mapping, but that's still under discussion. In the meantime we plan to > add a few traces to make sure the requests reach the GuC and use the GuC > logs for what goes on inside the FW (GuC logs include the context IDs it > uses for submission and all CSB events on high verbosity). I was more reflecting on what could be here instead. Details of the ctb? It would be great to have a snapshot of some relevant guc state, merely wonder if we could extract anything from the log automatically. As well as the usual what have we submitted to the guc. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
