drm/i915: Stop retiring along engine
We no longer track the execution order along the engine and so no longer need to enforce ordering of retire along the engine. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190614164606.15633-2-chris@chris-wilson.co.uk
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@ -183,72 +183,23 @@ static void free_capture_list(struct i915_request *request)
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}
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}
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static void __retire_engine_request(struct intel_engine_cs *engine,
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struct i915_request *rq)
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{
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GEM_TRACE("%s(%s) fence %llx:%lld, current %d\n",
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__func__, engine->name,
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rq->fence.context, rq->fence.seqno,
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hwsp_seqno(rq));
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GEM_BUG_ON(!i915_request_completed(rq));
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local_irq_disable();
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spin_lock(&engine->timeline.lock);
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GEM_BUG_ON(!list_is_first(&rq->link, &engine->timeline.requests));
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list_del_init(&rq->link);
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spin_unlock(&engine->timeline.lock);
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spin_lock(&rq->lock);
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i915_request_mark_complete(rq);
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if (!i915_request_signaled(rq))
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dma_fence_signal_locked(&rq->fence);
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if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &rq->fence.flags))
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i915_request_cancel_breadcrumb(rq);
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if (rq->waitboost) {
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GEM_BUG_ON(!atomic_read(&rq->i915->gt_pm.rps.num_waiters));
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atomic_dec(&rq->i915->gt_pm.rps.num_waiters);
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}
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spin_unlock(&rq->lock);
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local_irq_enable();
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}
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static void __retire_engine_upto(struct intel_engine_cs *engine,
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struct i915_request *rq)
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{
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struct i915_request *tmp;
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if (list_empty(&rq->link))
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return;
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do {
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tmp = list_first_entry(&engine->timeline.requests,
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typeof(*tmp), link);
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GEM_BUG_ON(tmp->engine != engine);
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__retire_engine_request(engine, tmp);
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} while (tmp != rq);
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}
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static void i915_request_retire(struct i915_request *request)
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static bool i915_request_retire(struct i915_request *rq)
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{
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struct i915_active_request *active, *next;
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lockdep_assert_held(&rq->i915->drm.struct_mutex);
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if (!i915_request_completed(rq))
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return false;
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GEM_TRACE("%s fence %llx:%lld, current %d\n",
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request->engine->name,
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request->fence.context, request->fence.seqno,
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hwsp_seqno(request));
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rq->engine->name,
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rq->fence.context, rq->fence.seqno,
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hwsp_seqno(rq));
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lockdep_assert_held(&request->i915->drm.struct_mutex);
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GEM_BUG_ON(!i915_sw_fence_signaled(&request->submit));
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GEM_BUG_ON(!i915_request_completed(request));
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GEM_BUG_ON(!i915_sw_fence_signaled(&rq->submit));
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trace_i915_request_retire(rq);
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trace_i915_request_retire(request);
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advance_ring(request);
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free_capture_list(request);
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advance_ring(rq);
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/*
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* Walk through the active list, calling retire on each. This allows
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@ -260,7 +211,7 @@ static void i915_request_retire(struct i915_request *request)
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* pass along the auxiliary information (to avoid dereferencing
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* the node after the callback).
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*/
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list_for_each_entry_safe(active, next, &request->active_list, link) {
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list_for_each_entry_safe(active, next, &rq->active_list, link) {
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/*
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* In microbenchmarks or focusing upon time inside the kernel,
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* we may spend an inordinate amount of time simply handling
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@ -276,18 +227,39 @@ static void i915_request_retire(struct i915_request *request)
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INIT_LIST_HEAD(&active->link);
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RCU_INIT_POINTER(active->request, NULL);
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active->retire(active, request);
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active->retire(active, rq);
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}
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i915_request_remove_from_client(request);
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local_irq_disable();
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__retire_engine_upto(request->engine, request);
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spin_lock(&rq->engine->timeline.lock);
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list_del(&rq->link);
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spin_unlock(&rq->engine->timeline.lock);
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intel_context_exit(request->hw_context);
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intel_context_unpin(request->hw_context);
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spin_lock(&rq->lock);
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i915_request_mark_complete(rq);
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if (!i915_request_signaled(rq))
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dma_fence_signal_locked(&rq->fence);
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if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &rq->fence.flags))
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i915_request_cancel_breadcrumb(rq);
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if (rq->waitboost) {
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GEM_BUG_ON(!atomic_read(&rq->i915->gt_pm.rps.num_waiters));
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atomic_dec(&rq->i915->gt_pm.rps.num_waiters);
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}
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spin_unlock(&rq->lock);
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i915_sched_node_fini(&request->sched);
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i915_request_put(request);
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local_irq_enable();
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intel_context_exit(rq->hw_context);
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intel_context_unpin(rq->hw_context);
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i915_request_remove_from_client(rq);
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free_capture_list(rq);
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i915_sched_node_fini(&rq->sched);
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i915_request_put(rq);
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return true;
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}
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void i915_request_retire_upto(struct i915_request *rq)
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@ -309,9 +281,7 @@ void i915_request_retire_upto(struct i915_request *rq)
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do {
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tmp = list_first_entry(&ring->request_list,
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typeof(*tmp), ring_link);
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i915_request_retire(tmp);
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} while (tmp != rq);
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} while (i915_request_retire(tmp) && tmp != rq);
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}
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static void irq_execute_cb(struct irq_work *wrk)
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@ -600,12 +570,9 @@ static void ring_retire_requests(struct intel_ring *ring)
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{
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struct i915_request *rq, *rn;
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list_for_each_entry_safe(rq, rn, &ring->request_list, ring_link) {
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if (!i915_request_completed(rq))
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list_for_each_entry_safe(rq, rn, &ring->request_list, ring_link)
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if (!i915_request_retire(rq))
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break;
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i915_request_retire(rq);
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}
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}
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static noinline struct i915_request *
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@ -620,6 +587,15 @@ request_alloc_slow(struct intel_context *ce, gfp_t gfp)
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if (!gfpflags_allow_blocking(gfp))
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goto out;
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/* Move our oldest request to the slab-cache (if not in use!) */
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rq = list_first_entry(&ring->request_list, typeof(*rq), ring_link);
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i915_request_retire(rq);
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rq = kmem_cache_alloc(global.slab_requests,
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gfp | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
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if (rq)
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return rq;
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/* Ratelimit ourselves to prevent oom from malicious clients */
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rq = list_last_entry(&ring->request_list, typeof(*rq), ring_link);
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cond_synchronize_rcu(rq->rcustate);
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@ -777,8 +753,7 @@ i915_request_create(struct intel_context *ce)
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/* Move our oldest request to the slab-cache (if not in use!) */
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rq = list_first_entry(&ce->ring->request_list, typeof(*rq), ring_link);
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if (!list_is_last(&rq->ring_link, &ce->ring->request_list) &&
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i915_request_completed(rq))
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if (!list_is_last(&rq->ring_link, &ce->ring->request_list))
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i915_request_retire(rq);
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intel_context_enter(ce);
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