diff options
| -rw-r--r-- | drivers/gpu/drm/i915/i915_request.c | 15 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_scheduler.c | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_scheduler.h | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_guc_submission.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lrc.c | 9 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/selftests/intel_lrc.c | 163 |
6 files changed, 189 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index a011bf4be48e..c65f6c990fdd 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -358,11 +358,14 @@ void __i915_request_submit(struct i915_request *request) /* We may be recursing from the signal callback of another i915 fence */ spin_lock_nested(&request->lock, SINGLE_DEPTH_NESTING); + GEM_BUG_ON(test_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags)); set_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags); + if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &request->fence.flags) && !i915_request_enable_breadcrumb(request)) intel_engine_queue_breadcrumbs(engine); + spin_unlock(&request->lock); engine->emit_fini_breadcrumb(request, @@ -406,10 +409,22 @@ void __i915_request_unsubmit(struct i915_request *request) /* We may be recursing from the signal callback of another i915 fence */ spin_lock_nested(&request->lock, SINGLE_DEPTH_NESTING); + + /* + * As we do not allow WAIT to preempt inflight requests, + * once we have executed a request, along with triggering + * any execution callbacks, we must preserve its ordering + * within the non-preemptible FIFO. + */ + BUILD_BUG_ON(__NO_PREEMPTION & ~I915_PRIORITY_MASK); /* only internal */ + request->sched.attr.priority |= __NO_PREEMPTION; + if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &request->fence.flags)) i915_request_cancel_breadcrumb(request); + GEM_BUG_ON(!test_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags)); clear_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags); + spin_unlock(&request->lock); /* Transfer back from the global per-engine timeline to per-context */ diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c index 0dd720593f9c..50018ad30233 100644 --- a/drivers/gpu/drm/i915/i915_scheduler.c +++ b/drivers/gpu/drm/i915/i915_scheduler.c @@ -324,7 +324,6 @@ static void __i915_schedule(struct i915_request *rq, if (node_signaled(p->signaler)) continue; - GEM_BUG_ON(p->signaler->attr.priority < node->attr.priority); if (prio > READ_ONCE(p->signaler->attr.priority)) list_move_tail(&p->dfs_link, &dfs); } diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h index bb3d496d4c49..7d4a49750d92 100644 --- a/drivers/gpu/drm/i915/i915_scheduler.h +++ b/drivers/gpu/drm/i915/i915_scheduler.h @@ -33,6 +33,8 @@ enum { #define I915_PRIORITY_WAIT ((u8)BIT(0)) #define I915_PRIORITY_NEWCLIENT ((u8)BIT(1)) +#define __NO_PREEMPTION (I915_PRIORITY_WAIT) + struct i915_sched_attr { /** * @priority: execution and service priority diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c index 4366db7978a8..56ba2fcbabe6 100644 --- a/drivers/gpu/drm/i915/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/intel_guc_submission.c @@ -720,7 +720,7 @@ static inline int rq_prio(const struct i915_request *rq) static inline int port_prio(const struct execlist_port *port) { - return rq_prio(port_request(port)); + return rq_prio(port_request(port)) | __NO_PREEMPTION; } static bool __guc_dequeue(struct intel_engine_cs *engine) diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 661d2f6da84f..4f2187aa44e4 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -188,6 +188,12 @@ static inline int rq_prio(const struct i915_request *rq) return rq->sched.attr.priority; } +static int effective_prio(const struct i915_request *rq) +{ + /* Restrict mere WAIT boosts from triggering preemption */ + return rq_prio(rq) | __NO_PREEMPTION; +} + static int queue_prio(const struct intel_engine_execlists *execlists) { struct i915_priolist *p; @@ -208,7 +214,7 @@ static int queue_prio(const struct intel_engine_execlists *execlists) static inline bool need_preempt(const struct intel_engine_cs *engine, const struct i915_request *rq) { - const int last_prio = rq_prio(rq); + int last_prio; if (!intel_engine_has_preemption(engine)) return false; @@ -228,6 +234,7 @@ static inline bool need_preempt(const struct intel_engine_cs *engine, * preempt. If that hint is stale or we may be trying to preempt * ourselves, ignore the request. */ + last_prio = effective_prio(rq); if (!__execlists_need_preempt(engine->execlists.queue_priority_hint, last_prio)) return false; diff --git a/drivers/gpu/drm/i915/selftests/intel_lrc.c b/drivers/gpu/drm/i915/selftests/intel_lrc.c index 0f7a5bf69646..0677038a5466 100644 --- a/drivers/gpu/drm/i915/selftests/intel_lrc.c +++ b/drivers/gpu/drm/i915/selftests/intel_lrc.c @@ -407,6 +407,168 @@ err_wedged: goto err_client_b; } +static int __i915_sw_fence_call +dummy_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state) +{ + return NOTIFY_DONE; +} + +static struct i915_request *dummy_request(struct intel_engine_cs *engine) +{ + struct i915_request *rq; + + rq = kzalloc(sizeof(*rq), GFP_KERNEL); + if (!rq) + return NULL; + + INIT_LIST_HEAD(&rq->active_list); + rq->engine = engine; + + i915_sched_node_init(&rq->sched); + + /* mark this request as permanently incomplete */ + rq->fence.seqno = 1; + BUILD_BUG_ON(sizeof(rq->fence.seqno) != 8); /* upper 32b == 0 */ + rq->hwsp_seqno = (u32 *)&rq->fence.seqno + 1; + GEM_BUG_ON(i915_request_completed(rq)); + + i915_sw_fence_init(&rq->submit, dummy_notify); + i915_sw_fence_commit(&rq->submit); + + return rq; +} + +static void dummy_request_free(struct i915_request *dummy) +{ + i915_request_mark_complete(dummy); + i915_sched_node_fini(&dummy->sched); + i915_sw_fence_fini(&dummy->submit); + + dma_fence_free(&dummy->fence); +} + +static int live_suppress_wait_preempt(void *arg) +{ + struct drm_i915_private *i915 = arg; + struct preempt_client client[4]; + struct intel_engine_cs *engine; + enum intel_engine_id id; + intel_wakeref_t wakeref; + int err = -ENOMEM; + int i; + + /* + * Waiters are given a little priority nudge, but not enough + * to actually cause any preemption. Double check that we do + * not needlessly generate preempt-to-idle cycles. + */ + + if (!HAS_LOGICAL_RING_PREEMPTION(i915)) + return 0; + + mutex_lock(&i915->drm.struct_mutex); + wakeref = intel_runtime_pm_get(i915); + + if (preempt_client_init(i915, &client[0])) /* ELSP[0] */ + goto err_unlock; + if (preempt_client_init(i915, &client[1])) /* ELSP[1] */ + goto err_client_0; + if (preempt_client_init(i915, &client[2])) /* head of queue */ + goto err_client_1; + if (preempt_client_init(i915, &client[3])) /* bystander */ + goto err_client_2; + + for_each_engine(engine, i915, id) { + int depth; + + if (!engine->emit_init_breadcrumb) + continue; + + for (depth = 0; depth < ARRAY_SIZE(client); depth++) { + struct i915_request *rq[ARRAY_SIZE(client)]; + struct i915_request *dummy; + + engine->execlists.preempt_hang.count = 0; + + dummy = dummy_request(engine); + if (!dummy) + goto err_client_3; + + for (i = 0; i < ARRAY_SIZE(client); i++) { + rq[i] = igt_spinner_create_request(&client[i].spin, + client[i].ctx, engine, + MI_NOOP); + if (IS_ERR(rq[i])) { + err = PTR_ERR(rq[i]); + goto err_wedged; + } + + /* Disable NEWCLIENT promotion */ + __i915_active_request_set(&rq[i]->timeline->last_request, + dummy); + i915_request_add(rq[i]); + } + + dummy_request_free(dummy); + + GEM_BUG_ON(i915_request_completed(rq[0])); + if (!igt_wait_for_spinner(&client[0].spin, rq[0])) { + pr_err("%s: First client failed to start\n", + engine->name); + goto err_wedged; + } + GEM_BUG_ON(!i915_request_started(rq[0])); + + if (i915_request_wait(rq[depth], + I915_WAIT_LOCKED | + I915_WAIT_PRIORITY, + 1) != -ETIME) { + pr_err("%s: Waiter depth:%d completed!\n", + engine->name, depth); + goto err_wedged; + } + + for (i = 0; i < ARRAY_SIZE(client); i++) + igt_spinner_end(&client[i].spin); + + if (igt_flush_test(i915, I915_WAIT_LOCKED)) + goto err_wedged; + + if (engine->execlists.preempt_hang.count) { + pr_err("%s: Preemption recorded x%d, depth %d; should have been suppressed!\n", + engine->name, + engine->execlists.preempt_hang.count, + depth); + err = -EINVAL; + goto err_client_3; + } + } + } + + err = 0; +err_client_3: + preempt_client_fini(&client[3]); +err_client_2: + preempt_client_fini(&client[2]); +err_client_1: + preempt_client_fini(&client[1]); +err_client_0: + preempt_client_fini(&client[0]); +err_unlock: + if (igt_flush_test(i915, I915_WAIT_LOCKED)) + err = -EIO; + intel_runtime_pm_put(i915, wakeref); + mutex_unlock(&i915->drm.struct_mutex); + return err; + +err_wedged: + for (i = 0; i < ARRAY_SIZE(client); i++) + igt_spinner_end(&client[i].spin); + i915_gem_set_wedged(i915); + err = -EIO; + goto err_client_3; +} + static int live_chain_preempt(void *arg) { struct drm_i915_private *i915 = arg; @@ -887,6 +1049,7 @@ int intel_execlists_live_selftests(struct drm_i915_private *i915) SUBTEST(live_preempt), SUBTEST(live_late_preempt), SUBTEST(live_suppress_self_preempt), + SUBTEST(live_suppress_wait_preempt), SUBTEST(live_chain_preempt), SUBTEST(live_preempt_hang), SUBTEST(live_preempt_smoke), |