Quoting Tvrtko Ursulin (2020-02-28 12:10:23)
>
> On 27/02/2020 08:57, Chris Wilson wrote:
> > An odd and highly unlikely path caught us out. On delayed submission
> > (due to an asynchronous reset handler), we poked the priority_hint and
> > kicked the tasklet. However, we had already marked the device as wedged
> > and swapped out the tasklet for a no-op. The result was that we never
> > cleared the priority hint and became upset when we later checked.
> >
> > <0> [574.303565] i915_sel-6278 2.... 481822445us : __i915_subtests:
> > Running intel_execlists_live_selftests/live_error_interrupt
> > <0> [574.303565] i915_sel-6278 2.... 481822472us : __engine_unpark:
> > 0000:00:02.0 rcs0:
> > <0> [574.303565] i915_sel-6278 2.... 481822491us : __gt_unpark:
> > 0000:00:02.0
> > <0> [574.303565] i915_sel-6278 2.... 481823220us :
> > execlists_context_reset: 0000:00:02.0 rcs0: context:f4ee reset
> > <0> [574.303565] i915_sel-6278 2.... 481824830us :
> > __intel_context_active: 0000:00:02.0 rcs0: context:f51b active
> > <0> [574.303565] i915_sel-6278 2.... 481825258us :
> > __intel_context_do_pin: 0000:00:02.0 rcs0: context:f51b pin
> > ring:{start:00006000, head:0000, tail:0000}
> > <0> [574.303565] i915_sel-6278 2.... 481825311us :
> > __i915_request_commit: 0000:00:02.0 rcs0: fence f51b:2, current 0
> > <0> [574.303565] i915_sel-6278 2d..1 481825347us :
> > __i915_request_submit: 0000:00:02.0 rcs0: fence f51b:2, current 0
> > <0> [574.303565] i915_sel-6278 2d..1 481825363us : trace_ports:
> > 0000:00:02.0 rcs0: submit { f51b:2, 0:0 }
> > <0> [574.303565] i915_sel-6278 2.... 481826809us :
> > __intel_context_active: 0000:00:02.0 rcs0: context:f51c active
> > <0> [574.303565] <idle>-0 7d.h2 481827326us : cs_irq_handler:
> > 0000:00:02.0 rcs0: CS error: 1
> > <0> [574.303565] <idle>-0 7..s1 481827377us : process_csb:
> > 0000:00:02.0 rcs0: cs-irq head=3, tail=4
> > <0> [574.303565] <idle>-0 7..s1 481827379us : process_csb:
> > 0000:00:02.0 rcs0: csb[4]: status=0x10000001:0x00000000
> > <0> [574.305593] <idle>-0 7..s1 481827385us : trace_ports:
> > 0000:00:02.0 rcs0: promote { f51b:2*, 0:0 }
> > <0> [574.305611] <idle>-0 7..s1 481828179us : execlists_reset:
> > 0000:00:02.0 rcs0: reset for CS error
> > <0> [574.305611] i915_sel-6278 2.... 481828284us :
> > __intel_context_do_pin: 0000:00:02.0 rcs0: context:f51c pin
> > ring:{start:00007000, head:0000, tail:0000}
> > <0> [574.305611] i915_sel-6278 2.... 481828345us :
> > __i915_request_commit: 0000:00:02.0 rcs0: fence f51c:2, current 0
> > <0> [574.305611] <idle>-0 7dNs2 481847823us :
> > __i915_request_unsubmit: 0000:00:02.0 rcs0: fence f51b:2, current 1
> > <0> [574.305611] <idle>-0 7dNs2 481847857us : execlists_hold:
> > 0000:00:02.0 rcs0: fence f51b:2, current 1 on hold
> > <0> [574.305611] <idle>-0 7.Ns1 481847863us : intel_engine_reset:
> > 0000:00:02.0 rcs0: flags=4
> > <0> [574.305611] <idle>-0 7.Ns1 481847945us :
> > execlists_reset_prepare: 0000:00:02.0 rcs0: depth<-1
> > <0> [574.305611] <idle>-0 7.Ns1 481847946us : intel_engine_stop_cs:
> > 0000:00:02.0 rcs0:
> > <0> [574.305611] <idle>-0 7.Ns1 538584284us : intel_engine_stop_cs:
> > 0000:00:02.0 rcs0: timed out on STOP_RING -> IDLE
> > <0> [574.305611] <idle>-0 7.Ns1 538584347us : __intel_gt_reset:
> > 0000:00:02.0 engine_mask=1
> > <0> [574.305611] <idle>-0 7.Ns1 538584406us :
> > execlists_reset_rewind: 0000:00:02.0 rcs0:
> > <0> [574.305611] <idle>-0 7dNs2 538585050us : __i915_request_reset:
> > 0000:00:02.0 rcs0: fence f51b:2, current 1 guilty? yes
> > <0> [574.305611] <idle>-0 7dNs2 538585063us : __execlists_reset:
> > 0000:00:02.0 rcs0: replay {head:0000, tail:0068}
> > <0> [574.306565] <idle>-0 7.Ns1 538588457us :
> > intel_engine_cancel_stop_cs: 0000:00:02.0 rcs0:
> > <0> [574.306565] <idle>-0 7dNs2 538588462us :
> > __i915_request_submit: 0000:00:02.0 rcs0: fence f51c:2, current 0
> > <0> [574.306565] <idle>-0 7dNs2 538588471us : trace_ports:
> > 0000:00:02.0 rcs0: submit { f51c:2, 0:0 }
> > <0> [574.306565] <idle>-0 7.Ns1 538588474us :
> > execlists_reset_finish: 0000:00:02.0 rcs0: depth->1
> > <0> [574.306565] kworker/-202 2.... 538588755us : i915_request_retire:
> > 0000:00:02.0 rcs0: fence f51c:2, current 2
> > <0> [574.306565] ksoftirq-46 7..s. 538588773us : process_csb:
> > 0000:00:02.0 rcs0: cs-irq head=11, tail=1
> > <0> [574.306565] ksoftirq-46 7..s. 538588774us : process_csb:
> > 0000:00:02.0 rcs0: csb[0]: status=0x10000001:0x00000000
> > <0> [574.306565] ksoftirq-46 7..s. 538588776us : trace_ports:
> > 0000:00:02.0 rcs0: promote { f51c:2!, 0:0 }
> > <0> [574.306565] ksoftirq-46 7..s. 538588778us : process_csb:
> > 0000:00:02.0 rcs0: csb[1]: status=0x10000018:0x00000020
> > <0> [574.306565] ksoftirq-46 7..s. 538588779us : trace_ports:
> > 0000:00:02.0 rcs0: completed { f51c:2!, 0:0 }
> > <0> [574.306565] kworker/-202 2.... 538588826us : intel_context_unpin:
> > 0000:00:02.0 rcs0: context:f51c unpin
> > <0> [574.306565] i915_sel-6278 6.... 538589663us :
> > __intel_gt_set_wedged.part.32: 0000:00:02.0 start
> > <0> [574.306565] i915_sel-6278 6.... 538589667us :
> > execlists_reset_prepare: 0000:00:02.0 rcs0: depth<-0
> > <0> [574.306565] i915_sel-6278 6.... 538589710us : intel_engine_stop_cs:
> > 0000:00:02.0 rcs0:
> > <0> [574.306565] i915_sel-6278 6.... 538589732us :
> > execlists_reset_prepare: 0000:00:02.0 bcs0: depth<-0
> > <0> [574.307591] i915_sel-6278 6.... 538589733us : intel_engine_stop_cs:
> > 0000:00:02.0 bcs0:
> > <0> [574.307591] i915_sel-6278 6.... 538589757us :
> > execlists_reset_prepare: 0000:00:02.0 vcs0: depth<-0
> > <0> [574.307591] i915_sel-6278 6.... 538589758us : intel_engine_stop_cs:
> > 0000:00:02.0 vcs0:
> > <0> [574.307591] i915_sel-6278 6.... 538589771us :
> > execlists_reset_prepare: 0000:00:02.0 vcs1: depth<-0
> > <0> [574.307591] i915_sel-6278 6.... 538589772us : intel_engine_stop_cs:
> > 0000:00:02.0 vcs1:
> > <0> [574.307591] i915_sel-6278 6.... 538589778us :
> > execlists_reset_prepare: 0000:00:02.0 vecs0: depth<-0
> > <0> [574.307591] i915_sel-6278 6.... 538589780us : intel_engine_stop_cs:
> > 0000:00:02.0 vecs0:
> > <0> [574.307591] i915_sel-6278 6.... 538589786us : __intel_gt_reset:
> > 0000:00:02.0 engine_mask=ff
> > <0> [574.307591] i915_sel-6278 6.... 538591175us :
> > execlists_reset_cancel: 0000:00:02.0 rcs0:
> > <0> [574.307591] i915_sel-6278 6.... 538591970us :
> > execlists_reset_cancel: 0000:00:02.0 bcs0:
> > <0> [574.307591] i915_sel-6278 6.... 538591982us :
> > execlists_reset_cancel: 0000:00:02.0 vcs0:
> > <0> [574.307591] i915_sel-6278 6.... 538591996us :
> > execlists_reset_cancel: 0000:00:02.0 vcs1:
> > <0> [574.307591] i915_sel-6278 6.... 538592759us :
> > execlists_reset_cancel: 0000:00:02.0 vecs0:
> > <0> [574.307591] i915_sel-6278 6.... 538592977us :
> > execlists_reset_finish: 0000:00:02.0 rcs0: depth->0
> > <0> [574.307591] i915_sel-6278 6.N.. 538592996us :
> > execlists_reset_finish: 0000:00:02.0 bcs0: depth->0
> > <0> [574.307591] i915_sel-6278 6.N.. 538593023us :
> > execlists_reset_finish: 0000:00:02.0 vcs0: depth->0
> > <0> [574.307591] i915_sel-6278 6.N.. 538593037us :
> > execlists_reset_finish: 0000:00:02.0 vcs1: depth->0
> > <0> [574.307591] i915_sel-6278 6.N.. 538593051us :
> > execlists_reset_finish: 0000:00:02.0 vecs0: depth->0
> > <0> [574.307591] i915_sel-6278 6.... 538593407us :
> > __intel_gt_set_wedged.part.32: 0000:00:02.0 end
> > <0> [574.307591] kworker/-210 7d..1 551958381us : execlists_unhold:
> > 0000:00:02.0 rcs0: fence f51b:2, current 2 hold release
> > <0> [574.307591] i915_sel-6278 0.... 559490788us : i915_request_retire:
> > 0000:00:02.0 rcs0: fence f51b:2, current 2
> > <0> [574.307591] i915_sel-6278 0.... 559490793us : intel_context_unpin:
> > 0000:00:02.0 rcs0: context:f51b unpin
> > <0> [574.307591] i915_sel-6278 0.... 559490798us : __engine_park:
> > 0000:00:02.0 rcs0: parked
> > <0> [574.307591] i915_sel-6278 0.... 559490982us :
> > __intel_context_retire: 0000:00:02.0 rcs0: context:f51c retire runtime: {
> > total:30004ns, avg:30004ns }
> > <0> [574.307591] i915_sel-6278 0.... 559491372us : __engine_park:
> > __engine_park:261 GEM_BUG_ON(engine->execlists.queue_priority_hint !=
> > (-((int)(~0U >> 1)) - 1))
> >
> > Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> > ---
> > drivers/gpu/drm/i915/gt/intel_lrc.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c
> > b/drivers/gpu/drm/i915/gt/intel_lrc.c
> > index 39b0125b7143..35c5cf786726 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
> > @@ -3724,7 +3724,10 @@ static void execlists_reset_rewind(struct
> > intel_engine_cs *engine, bool stalled)
> >
> > static void nop_submission_tasklet(unsigned long data)
> > {
> > + struct intel_engine_cs * const engine = (struct intel_engine_cs
> > *)data;
> > +
> > /* The driver is wedged; don't process any more events. */
> > + WRITE_ONCE(engine->execlists.queue_priority_hint, INT_MIN);
>
> Why from the tasklet and not the place which clears the queue?
That would be the list_move within nop_submit_request()
[i915_request_submit]
I chose this tasklet as we do the reset in execlists_submission_tasklet()
on clearing the queue there, and so thought this was analogous.
-Chris
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