diff options
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_lrc.c | 34 |
1 files changed, 27 insertions, 7 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c index 3d5f3f7677bb..9fff4e02cee6 100644 --- a/drivers/gpu/drm/i915/gt/intel_lrc.c +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c @@ -2342,6 +2342,13 @@ gen8_csb_parse(const struct intel_engine_execlists *execlists, const u32 *csb) return *csb & (GEN8_CTX_STATUS_IDLE_ACTIVE | GEN8_CTX_STATUS_PREEMPTED); } +static inline void flush_hwsp(const struct i915_request *rq) +{ + mb(); + clflush((void *)READ_ONCE(rq->hwsp_seqno)); + mb(); +} + static void process_csb(struct intel_engine_cs *engine) { struct intel_engine_execlists * const execlists = &engine->execlists; @@ -2418,8 +2425,6 @@ static void process_csb(struct intel_engine_cs *engine) if (promote) { struct i915_request * const *old = execlists->active; - GEM_BUG_ON(!assert_pending_valid(execlists, "promote")); - ring_set_paused(engine, 0); /* Point active to the new ELSP; prevent overwriting */ @@ -2432,6 +2437,7 @@ static void process_csb(struct intel_engine_cs *engine) execlists_schedule_out(*old++); /* switch pending to inflight */ + GEM_BUG_ON(!assert_pending_valid(execlists, "promote")); memcpy(execlists->inflight, execlists->pending, execlists_num_ports(execlists) * @@ -2453,13 +2459,24 @@ static void process_csb(struct intel_engine_cs *engine) * user interrupt and CSB is processed. */ if (GEM_SHOW_DEBUG() && - !i915_request_completed(*execlists->active) && - !reset_in_progress(execlists)) { - struct i915_request *rq __maybe_unused = - *execlists->active; + !i915_request_completed(*execlists->active)) { + struct i915_request *rq = *execlists->active; const u32 *regs __maybe_unused = rq->context->lrc_reg_state; + /* + * Flush the breadcrumb before crying foul. + * + * Since we have hit this on icl and seen the + * breadcrumb advance as we print out the debug + * info (so the problem corrected itself without + * lasting damage), and we know that icl suffers + * from missing global observation points in + * execlists, presume that affects even more + * coherency. + */ + flush_hwsp(rq); + ENGINE_TRACE(engine, "ring:{start:0x%08x, head:%04x, tail:%04x, ctl:%08x, mode:%08x}\n", ENGINE_READ(engine, RING_START), @@ -2480,7 +2497,10 @@ static void process_csb(struct intel_engine_cs *engine) regs[CTX_RING_HEAD], regs[CTX_RING_TAIL]); - GEM_BUG_ON("context completed before request"); + /* Still? Declare it caput! */ + if (!i915_request_completed(rq) && + !reset_in_progress(execlists)) + GEM_BUG_ON("context completed before request"); } execlists_schedule_out(*execlists->active++); |