On Fri, Jun 04, 2021 at 02:00:33PM -0500, Jason Ekstrand wrote:
> On Thu, Jun 3, 2021 at 4:09 PM Matthew Brost <matthew.brost@xxxxxxxxx> wrote:
> >
> > Move active request tracking and its lock to i915_sched_engine. This
> > lock is also the submission lock so having it in the i915_sched_engine
> > is the correct place.
> >
> > Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/gt/intel_engine.h | 2 -
> > drivers/gpu/drm/i915/gt/intel_engine_cs.c | 43 +++-----
> > drivers/gpu/drm/i915/gt/intel_engine_types.h | 6 --
> > .../drm/i915/gt/intel_execlists_submission.c | 98 ++++++++++---------
> > .../gpu/drm/i915/gt/intel_ring_submission.c | 12 +--
> > drivers/gpu/drm/i915/gt/mock_engine.c | 7 +-
> > drivers/gpu/drm/i915/gt/selftest_execlists.c | 4 +-
> > .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 20 ++--
> > drivers/gpu/drm/i915/i915_gpu_error.c | 4 +-
> > drivers/gpu/drm/i915/i915_request.c | 32 +++---
> > drivers/gpu/drm/i915/i915_request.h | 2 +-
> > drivers/gpu/drm/i915/i915_scheduler.c | 30 ++++--
> > drivers/gpu/drm/i915/i915_scheduler_types.h | 9 ++
> > 13 files changed, 134 insertions(+), 135 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
> > index 8d9184920c51..a8b2174b4395 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine.h
> > @@ -257,8 +257,6 @@ intel_engine_find_active_request(struct intel_engine_cs *engine);
> >
> > u32 intel_engine_context_size(struct intel_gt *gt, u8 class);
> >
> > -void intel_engine_init_active(struct intel_engine_cs *engine,
> > - unsigned int subclass);
> > #define ENGINE_PHYSICAL 0
> > #define ENGINE_MOCK 1
> > #define ENGINE_VIRTUAL 2
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > index 85f2effe9dc6..33d879137908 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > @@ -719,7 +719,6 @@ static int engine_setup_common(struct intel_engine_cs *engine)
> > if (err)
> > goto err_cmd_parser;
> >
> > - intel_engine_init_active(engine, ENGINE_PHYSICAL);
> > intel_engine_init_execlists(engine);
> > intel_engine_init__pm(engine);
> > intel_engine_init_retire(engine);
> > @@ -778,11 +777,11 @@ static int measure_breadcrumb_dw(struct intel_context *ce)
> > frame->rq.ring = &frame->ring;
> >
> > mutex_lock(&ce->timeline->mutex);
> > - spin_lock_irq(&engine->active.lock);
> > + spin_lock_irq(&engine->sched_engine->lock);
> >
> > dw = engine->emit_fini_breadcrumb(&frame->rq, frame->cs) - frame->cs;
> >
> > - spin_unlock_irq(&engine->active.lock);
> > + spin_unlock_irq(&engine->sched_engine->lock);
> > mutex_unlock(&ce->timeline->mutex);
> >
> > GEM_BUG_ON(dw & 1); /* RING_TAIL must be qword aligned */
> > @@ -791,28 +790,6 @@ static int measure_breadcrumb_dw(struct intel_context *ce)
> > return dw;
> > }
> >
> > -void
> > -intel_engine_init_active(struct intel_engine_cs *engine, unsigned int subclass)
> > -{
> > - INIT_LIST_HEAD(&engine->active.requests);
> > - INIT_LIST_HEAD(&engine->active.hold);
> > -
> > - spin_lock_init(&engine->active.lock);
> > - lockdep_set_subclass(&engine->active.lock, subclass);
> > -
> > - /*
> > - * Due to an interesting quirk in lockdep's internal debug tracking,
> > - * after setting a subclass we must ensure the lock is used. Otherwise,
> > - * nr_unused_locks is incremented once too often.
> > - */
> > -#ifdef CONFIG_DEBUG_LOCK_ALLOC
> > - local_irq_disable();
> > - lock_map_acquire(&engine->active.lock.dep_map);
> > - lock_map_release(&engine->active.lock.dep_map);
> > - local_irq_enable();
> > -#endif
> > -}
> > -
> > static struct intel_context *
> > create_pinned_context(struct intel_engine_cs *engine,
> > unsigned int hwsp,
> > @@ -960,7 +937,7 @@ int intel_engines_init(struct intel_gt *gt)
> > */
> > void intel_engine_cleanup_common(struct intel_engine_cs *engine)
> > {
> > - GEM_BUG_ON(!list_empty(&engine->active.requests));
> > + GEM_BUG_ON(!list_empty(&engine->sched_engine->requests));
> > tasklet_kill(&engine->execlists.tasklet); /* flush the callback */
> >
> > i915_sched_engine_put(engine->sched_engine);
> > @@ -1353,7 +1330,7 @@ static struct intel_timeline *get_timeline(struct i915_request *rq)
> > struct intel_timeline *tl;
> >
> > /*
> > - * Even though we are holding the engine->active.lock here, there
> > + * Even though we are holding the engine->sched_engine->lock here, there
> > * is no control over the submission queue per-se and we are
> > * inspecting the active state at a random point in time, with an
> > * unknown queue. Play safe and make sure the timeline remains valid.
> > @@ -1700,7 +1677,7 @@ void intel_engine_dump(struct intel_engine_cs *engine,
> >
> > drm_printf(m, "\tRequests:\n");
> >
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> > rq = intel_engine_find_active_request(engine);
> > if (rq) {
> > struct intel_timeline *tl = get_timeline(rq);
> > @@ -1731,8 +1708,9 @@ void intel_engine_dump(struct intel_engine_cs *engine,
> > hexdump(m, rq->context->lrc_reg_state, PAGE_SIZE);
> > }
> > }
> > - drm_printf(m, "\tOn hold?: %lu\n", list_count(&engine->active.hold));
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + drm_printf(m, "\tOn hold?: %lu\n",
> > + list_count(&engine->sched_engine->hold));
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> >
> > drm_printf(m, "\tMMIO base: 0x%08x\n", engine->mmio_base);
> > wakeref = intel_runtime_pm_get_if_in_use(engine->uncore->rpm);
> > @@ -1812,7 +1790,7 @@ intel_engine_find_active_request(struct intel_engine_cs *engine)
> > * At all other times, we must assume the GPU is still running, but
> > * we only care about the snapshot of this moment.
> > */
> > - lockdep_assert_held(&engine->active.lock);
> > + lockdep_assert_held(&engine->sched_engine->lock);
> >
> > rcu_read_lock();
> > request = execlists_active(&engine->execlists);
> > @@ -1830,7 +1808,8 @@ intel_engine_find_active_request(struct intel_engine_cs *engine)
> > if (active)
> > return active;
> >
> > - list_for_each_entry(request, &engine->active.requests, sched.link) {
> > + list_for_each_entry(request, &engine->sched_engine->requests,
> > + sched.link) {
> > if (__i915_request_is_complete(request))
> > continue;
> >
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > index 86b41ddec373..7197b9fa5e35 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > @@ -302,12 +302,6 @@ struct intel_engine_cs {
> >
> > struct intel_sseu sseu;
> >
> > - struct {
> > - spinlock_t lock;
> > - struct list_head requests;
> > - struct list_head hold; /* ready requests, but on hold */
> > - } active;
> > -
> > struct i915_sched_engine *sched_engine;
> >
> > /* keep a request in reserve for a [pm] barrier under oom */
> > diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > index 609753b5401a..0413ba87cc1e 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > @@ -325,7 +325,7 @@ static bool need_preempt(const struct intel_engine_cs *engine,
> > * Check against the first request in ELSP[1], it will, thanks to the
> > * power of PI, be the highest priority of that context.
> > */
> > - if (!list_is_last(&rq->sched.link, &engine->active.requests) &&
> > + if (!list_is_last(&rq->sched.link, &engine->sched_engine->requests) &&
> > rq_prio(list_next_entry(rq, sched.link)) > last_prio)
> > return true;
> >
> > @@ -367,10 +367,10 @@ __unwind_incomplete_requests(struct intel_engine_cs *engine)
> > struct list_head *pl;
> > int prio = I915_PRIORITY_INVALID;
> >
> > - lockdep_assert_held(&engine->active.lock);
> > + lockdep_assert_held(&engine->sched_engine->lock);
> >
> > list_for_each_entry_safe_reverse(rq, rn,
> > - &engine->active.requests,
> > + &engine->sched_engine->requests,
> > sched.link) {
> > if (__i915_request_is_complete(rq)) {
> > list_del_init(&rq->sched.link);
> > @@ -534,13 +534,13 @@ resubmit_virtual_request(struct i915_request *rq, struct virtual_engine *ve)
> > {
> > struct intel_engine_cs *engine = rq->engine;
> >
> > - spin_lock_irq(&engine->active.lock);
> > + spin_lock_irq(&engine->sched_engine->lock);
> >
> > clear_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
> > WRITE_ONCE(rq->engine, &ve->base);
> > ve->base.submit_request(rq);
> >
> > - spin_unlock_irq(&engine->active.lock);
> > + spin_unlock_irq(&engine->sched_engine->lock);
> > }
> >
> > static void kick_siblings(struct i915_request *rq, struct intel_context *ce)
> > @@ -579,7 +579,7 @@ static void __execlists_schedule_out(struct i915_request * const rq,
> > unsigned int ccid;
> >
> > /*
> > - * NB process_csb() is not under the engine->active.lock and hence
> > + * NB process_csb() is not under the engine->sched_engine->lock and hence
> > * schedule_out can race with schedule_in meaning that we should
> > * refrain from doing non-trivial work here.
> > */
> > @@ -1133,7 +1133,8 @@ static bool needs_timeslice(const struct intel_engine_cs *engine,
> > return false;
> >
> > /* If ELSP[1] is occupied, always check to see if worth slicing */
> > - if (!list_is_last_rcu(&rq->sched.link, &engine->active.requests)) {
> > + if (!list_is_last_rcu(&rq->sched.link,
> > + &engine->sched_engine->requests)) {
> > ENGINE_TRACE(engine, "timeslice required for second inflight context\n");
> > return true;
> > }
> > @@ -1266,7 +1267,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > * and context switches) submission.
> > */
> >
> > - spin_lock(&engine->active.lock);
> > + spin_lock(&sched_engine->lock);
> >
> > /*
> > * If the queue is higher priority than the last
> > @@ -1366,7 +1367,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > * Even if ELSP[1] is occupied and not worthy
> > * of timeslices, our queue might be.
> > */
> > - spin_unlock(&engine->active.lock);
> > + spin_unlock(&sched_engine->lock);
> > return;
> > }
> > }
> > @@ -1376,7 +1377,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > while ((ve = first_virtual_engine(engine))) {
> > struct i915_request *rq;
> >
> > - spin_lock(&ve->base.active.lock);
> > + spin_lock(&ve->base.sched_engine->lock);
> >
> > rq = ve->request;
> > if (unlikely(!virtual_matches(ve, rq, engine)))
> > @@ -1386,13 +1387,13 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > GEM_BUG_ON(rq->context != &ve->context);
> >
> > if (unlikely(rq_prio(rq) < queue_prio(sched_engine))) {
> > - spin_unlock(&ve->base.active.lock);
> > + spin_unlock(&ve->base.sched_engine->lock);
> > break;
> > }
> >
> > if (last && !can_merge_rq(last, rq)) {
> > - spin_unlock(&ve->base.active.lock);
> > - spin_unlock(&engine->active.lock);
> > + spin_unlock(&ve->base.sched_engine->lock);
> > + spin_unlock(&engine->sched_engine->lock);
> > return; /* leave this for another sibling */
> > }
> >
> > @@ -1438,7 +1439,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> >
> > i915_request_put(rq);
> > unlock:
> > - spin_unlock(&ve->base.active.lock);
> > + spin_unlock(&ve->base.sched_engine->lock);
> >
> > /*
> > * Hmm, we have a bunch of virtual engine requests,
> > @@ -1554,7 +1555,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > */
> > sched_engine->queue_priority_hint = queue_prio(sched_engine);
> > i915_sched_engine_reset_on_empty(sched_engine);
> > - spin_unlock(&engine->active.lock);
> > + spin_unlock(&sched_engine->lock);
> >
> > /*
> > * We can skip poking the HW if we ended up with exactly the same set
> > @@ -1981,7 +1982,8 @@ static void __execlists_hold(struct i915_request *rq)
> > __i915_request_unsubmit(rq);
> >
> > clear_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
> > - list_move_tail(&rq->sched.link, &rq->engine->active.hold);
> > + list_move_tail(&rq->sched.link,
> > + &rq->engine->sched_engine->hold);
> > i915_request_set_hold(rq);
> > RQ_TRACE(rq, "on hold\n");
> >
> > @@ -2018,7 +2020,7 @@ static bool execlists_hold(struct intel_engine_cs *engine,
> > if (i915_request_on_hold(rq))
> > return false;
> >
> > - spin_lock_irq(&engine->active.lock);
> > + spin_lock_irq(&engine->sched_engine->lock);
> >
> > if (__i915_request_is_complete(rq)) { /* too late! */
> > rq = NULL;
> > @@ -2034,10 +2036,10 @@ static bool execlists_hold(struct intel_engine_cs *engine,
> > GEM_BUG_ON(i915_request_on_hold(rq));
> > GEM_BUG_ON(rq->engine != engine);
> > __execlists_hold(rq);
> > - GEM_BUG_ON(list_empty(&engine->active.hold));
> > + GEM_BUG_ON(list_empty(&engine->sched_engine->hold));
> >
> > unlock:
> > - spin_unlock_irq(&engine->active.lock);
> > + spin_unlock_irq(&engine->sched_engine->lock);
> > return rq;
> > }
> >
> > @@ -2117,7 +2119,7 @@ static void __execlists_unhold(struct i915_request *rq)
> > static void execlists_unhold(struct intel_engine_cs *engine,
> > struct i915_request *rq)
> > {
> > - spin_lock_irq(&engine->active.lock);
> > + spin_lock_irq(&engine->sched_engine->lock);
> >
> > /*
> > * Move this request back to the priority queue, and all of its
> > @@ -2130,7 +2132,7 @@ static void execlists_unhold(struct intel_engine_cs *engine,
> > tasklet_hi_schedule(&engine->execlists.tasklet);
> > }
> >
> > - spin_unlock_irq(&engine->active.lock);
> > + spin_unlock_irq(&engine->sched_engine->lock);
> > }
> >
> > struct execlists_capture {
> > @@ -2260,13 +2262,13 @@ static void execlists_capture(struct intel_engine_cs *engine)
> > if (!cap)
> > return;
> >
> > - spin_lock_irq(&engine->active.lock);
> > + spin_lock_irq(&engine->sched_engine->lock);
> > cap->rq = active_context(engine, active_ccid(engine));
> > if (cap->rq) {
> > cap->rq = active_request(cap->rq->context->timeline, cap->rq);
> > cap->rq = i915_request_get_rcu(cap->rq);
> > }
> > - spin_unlock_irq(&engine->active.lock);
> > + spin_unlock_irq(&engine->sched_engine->lock);
> > if (!cap->rq)
> > goto err_free;
> >
> > @@ -2470,7 +2472,7 @@ static bool ancestor_on_hold(const struct intel_engine_cs *engine,
> > const struct i915_request *rq)
> > {
> > GEM_BUG_ON(i915_request_on_hold(rq));
> > - return !list_empty(&engine->active.hold) && hold_request(rq);
> > + return !list_empty(&engine->sched_engine->hold) && hold_request(rq);
> > }
> >
> > static void execlists_submit_request(struct i915_request *request)
> > @@ -2479,11 +2481,12 @@ static void execlists_submit_request(struct i915_request *request)
> > unsigned long flags;
> >
> > /* Will be called from irq-context when using foreign fences. */
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> >
> > if (unlikely(ancestor_on_hold(engine, request))) {
> > RQ_TRACE(request, "ancestor on hold\n");
> > - list_add_tail(&request->sched.link, &engine->active.hold);
> > + list_add_tail(&request->sched.link,
> > + &engine->sched_engine->hold);
> > i915_request_set_hold(request);
> > } else {
> > queue_request(engine, request);
> > @@ -2495,7 +2498,7 @@ static void execlists_submit_request(struct i915_request *request)
> > __execlists_kick(&engine->execlists);
> > }
> >
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > }
> >
> > static int
> > @@ -2959,9 +2962,9 @@ static void execlists_reset_rewind(struct intel_engine_cs *engine, bool stalled)
> >
> > /* Push back any incomplete requests for replay after the reset. */
> > rcu_read_lock();
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> > __unwind_incomplete_requests(engine);
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > rcu_read_unlock();
> > }
> >
> > @@ -3001,10 +3004,10 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
> > execlists_reset_csb(engine, true);
> >
> > rcu_read_lock();
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> >
> > /* Mark all executing requests as skipped. */
> > - list_for_each_entry(rq, &engine->active.requests, sched.link)
> > + list_for_each_entry(rq, &engine->sched_engine->requests, sched.link)
> > i915_request_put(i915_request_mark_eio(rq));
> > intel_engine_signal_breadcrumbs(engine);
> >
> > @@ -3024,7 +3027,7 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
> > }
> >
> > /* On-hold requests will be flushed to timeline upon their release */
> > - list_for_each_entry(rq, &engine->active.hold, sched.link)
> > + list_for_each_entry(rq, &sched_engine->hold, sched.link)
> > i915_request_put(i915_request_mark_eio(rq));
> >
> > /* Cancel all attached virtual engines */
> > @@ -3035,7 +3038,7 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
> > rb_erase_cached(rb, &execlists->virtual);
> > RB_CLEAR_NODE(rb);
> >
> > - spin_lock(&ve->base.active.lock);
> > + spin_lock(&ve->base.sched_engine->lock);
> > rq = fetch_and_zero(&ve->request);
> > if (rq) {
> > if (i915_request_mark_eio(rq)) {
> > @@ -3047,7 +3050,7 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
> >
> > ve->base.sched_engine->queue_priority_hint = INT_MIN;
> > }
> > - spin_unlock(&ve->base.active.lock);
> > + spin_unlock(&ve->base.sched_engine->lock);
> > }
> >
> > /* Remaining _unready_ requests will be nop'ed when submitted */
> > @@ -3058,7 +3061,7 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
> > GEM_BUG_ON(__tasklet_is_enabled(&execlists->tasklet));
> > execlists->tasklet.callback = nop_submission_tasklet;
> >
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > rcu_read_unlock();
> > }
> >
> > @@ -3304,7 +3307,7 @@ static void rcu_virtual_context_destroy(struct work_struct *wrk)
> > if (unlikely(ve->request)) {
> > struct i915_request *old;
> >
> > - spin_lock_irq(&ve->base.active.lock);
> > + spin_lock_irq(&ve->base.sched_engine->lock);
> >
> > old = fetch_and_zero(&ve->request);
> > if (old) {
> > @@ -3313,7 +3316,7 @@ static void rcu_virtual_context_destroy(struct work_struct *wrk)
> > i915_request_put(old);
> > }
> >
> > - spin_unlock_irq(&ve->base.active.lock);
> > + spin_unlock_irq(&ve->base.sched_engine->lock);
> > }
> >
> > /*
> > @@ -3333,13 +3336,13 @@ static void rcu_virtual_context_destroy(struct work_struct *wrk)
> > if (RB_EMPTY_NODE(node))
> > continue;
> >
> > - spin_lock_irq(&sibling->active.lock);
> > + spin_lock_irq(&sibling->sched_engine->lock);
> >
> > /* Detachment is lazily performed in the execlists tasklet */
> > if (!RB_EMPTY_NODE(node))
> > rb_erase_cached(node, &sibling->execlists.virtual);
> >
> > - spin_unlock_irq(&sibling->active.lock);
> > + spin_unlock_irq(&sibling->sched_engine->lock);
> > }
> > GEM_BUG_ON(__tasklet_is_scheduled(&ve->base.execlists.tasklet));
> > GEM_BUG_ON(!list_empty(virtual_queue(ve)));
> > @@ -3509,7 +3512,7 @@ static void virtual_submission_tasklet(struct tasklet_struct *t)
> > if (!READ_ONCE(ve->request))
> > break; /* already handled by a sibling's tasklet */
> >
> > - spin_lock_irq(&sibling->active.lock);
> > + spin_lock_irq(&sibling->sched_engine->lock);
> >
> > if (unlikely(!(mask & sibling->mask))) {
> > if (!RB_EMPTY_NODE(&node->rb)) {
> > @@ -3562,7 +3565,7 @@ static void virtual_submission_tasklet(struct tasklet_struct *t)
> > tasklet_hi_schedule(&sibling->execlists.tasklet);
> >
> > unlock_engine:
> > - spin_unlock_irq(&sibling->active.lock);
> > + spin_unlock_irq(&sibling->sched_engine->lock);
> >
> > if (intel_context_inflight(&ve->context))
> > break;
> > @@ -3580,7 +3583,7 @@ static void virtual_submit_request(struct i915_request *rq)
> >
> > GEM_BUG_ON(ve->base.submit_request != virtual_submit_request);
> >
> > - spin_lock_irqsave(&ve->base.active.lock, flags);
> > + spin_lock_irqsave(&ve->base.sched_engine->lock, flags);
> >
> > /* By the time we resubmit a request, it may be completed */
> > if (__i915_request_is_complete(rq)) {
> > @@ -3603,7 +3606,7 @@ static void virtual_submit_request(struct i915_request *rq)
> > tasklet_hi_schedule(&ve->base.execlists.tasklet);
> >
> > unlock:
> > - spin_unlock_irqrestore(&ve->base.active.lock, flags);
> > + spin_unlock_irqrestore(&ve->base.sched_engine->lock, flags);
> > }
> >
> > static struct ve_bond *
> > @@ -3687,7 +3690,6 @@ intel_execlists_create_virtual(struct intel_engine_cs **siblings,
> >
> > snprintf(ve->base.name, sizeof(ve->base.name), "virtual");
> >
> > - intel_engine_init_active(&ve->base, ENGINE_VIRTUAL);
> > intel_engine_init_execlists(&ve->base);
> >
> > ve->base.sched_engine = i915_sched_engine_create(ENGINE_VIRTUAL);
> > @@ -3860,17 +3862,17 @@ void intel_execlists_show_requests(struct intel_engine_cs *engine,
> > unsigned int max)
> > {
> > const struct intel_engine_execlists *execlists = &engine->execlists;
> > - const struct i915_sched_engine *sched_engine = engine->sched_engine;
> > + struct i915_sched_engine *sched_engine = engine->sched_engine;
> > struct i915_request *rq, *last;
> > unsigned long flags;
> > unsigned int count;
> > struct rb_node *rb;
> >
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&sched_engine->lock, flags);
> >
> > last = NULL;
> > count = 0;
> > - list_for_each_entry(rq, &engine->active.requests, sched.link) {
> > + list_for_each_entry(rq, &sched_engine->requests, sched.link) {
> > if (count++ < max - 1)
> > show_request(m, rq, "\t\t", 0);
> > else
> > @@ -3933,7 +3935,7 @@ void intel_execlists_show_requests(struct intel_engine_cs *engine,
> > show_request(m, last, "\t\t", 0);
> > }
> >
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&sched_engine->lock, flags);
> > }
> >
> > #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
> > diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
> > index 2b6dffcc2262..c98ae0f58790 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
> > @@ -339,9 +339,9 @@ static void reset_rewind(struct intel_engine_cs *engine, bool stalled)
> > u32 head;
> >
> > rq = NULL;
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> > rcu_read_lock();
> > - list_for_each_entry(pos, &engine->active.requests, sched.link) {
> > + list_for_each_entry(pos, &engine->sched_engine->requests, sched.link) {
> > if (!__i915_request_is_complete(pos)) {
> > rq = pos;
> > break;
> > @@ -396,7 +396,7 @@ static void reset_rewind(struct intel_engine_cs *engine, bool stalled)
> > }
> > engine->legacy.ring->head = intel_ring_wrap(engine->legacy.ring, head);
> >
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > }
> >
> > static void reset_finish(struct intel_engine_cs *engine)
> > @@ -408,16 +408,16 @@ static void reset_cancel(struct intel_engine_cs *engine)
> > struct i915_request *request;
> > unsigned long flags;
> >
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> >
> > /* Mark all submitted requests as skipped. */
> > - list_for_each_entry(request, &engine->active.requests, sched.link)
> > + list_for_each_entry(request, &engine->sched_engine->requests, sched.link)
> > i915_request_put(i915_request_mark_eio(request));
> > intel_engine_signal_breadcrumbs(engine);
> >
> > /* Remaining _unready_ requests will be nop'ed when submitted */
> >
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > }
> >
> > static void i9xx_submit_request(struct i915_request *request)
> > diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
> > index b1fdba13e900..a49fd3039f13 100644
> > --- a/drivers/gpu/drm/i915/gt/mock_engine.c
> > +++ b/drivers/gpu/drm/i915/gt/mock_engine.c
> > @@ -253,10 +253,10 @@ static void mock_reset_cancel(struct intel_engine_cs *engine)
> >
> > del_timer_sync(&mock->hw_delay);
> >
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> >
> > /* Mark all submitted requests as skipped. */
> > - list_for_each_entry(rq, &engine->active.requests, sched.link)
> > + list_for_each_entry(rq, &engine->sched_engine->requests, sched.link)
> > i915_request_put(i915_request_mark_eio(rq));
> > intel_engine_signal_breadcrumbs(engine);
> >
> > @@ -269,7 +269,7 @@ static void mock_reset_cancel(struct intel_engine_cs *engine)
> > }
> > INIT_LIST_HEAD(&mock->hw_queue);
> >
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > }
> >
> > static void mock_reset_finish(struct intel_engine_cs *engine)
> > @@ -350,7 +350,6 @@ int mock_engine_init(struct intel_engine_cs *engine)
> > if (!engine->sched_engine)
> > return -ENOMEM;
> >
> > - intel_engine_init_active(engine, ENGINE_MOCK);
> > intel_engine_init_execlists(engine);
> > intel_engine_init__pm(engine);
> > intel_engine_init_retire(engine);
> > diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c
> > index 1f93591a8c69..fd824fa329c2 100644
> > --- a/drivers/gpu/drm/i915/gt/selftest_execlists.c
> > +++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c
> > @@ -4599,9 +4599,9 @@ static int reset_virtual_engine(struct intel_gt *gt,
> > GEM_BUG_ON(execlists_active(&engine->execlists) != rq);
> >
> > /* Fake a preemption event; failed of course */
> > - spin_lock_irq(&engine->active.lock);
> > + spin_lock_irq(&engine->sched_engine->lock);
> > __unwind_incomplete_requests(engine);
> > - spin_unlock_irq(&engine->active.lock);
> > + spin_unlock_irq(&engine->sched_engine->lock);
> > GEM_BUG_ON(rq->engine != engine);
> >
> > /* Reset the engine while keeping our active request on hold */
> > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > index f4a6fbfaf82e..2551019ee217 100644
> > --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > @@ -190,7 +190,7 @@ static void __guc_dequeue(struct intel_engine_cs *engine)
> > bool submit = false;
> > struct rb_node *rb;
> >
> > - lockdep_assert_held(&engine->active.lock);
> > + lockdep_assert_held(&sched_engine->lock);
> >
> > if (last) {
> > if (*++first)
> > @@ -247,7 +247,7 @@ static void guc_submission_tasklet(struct tasklet_struct *t)
> > struct i915_request **port, *rq;
> > unsigned long flags;
> >
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> >
> > for (port = execlists->inflight; (rq = *port); port++) {
> > if (!i915_request_completed(rq))
> > @@ -265,7 +265,7 @@ static void guc_submission_tasklet(struct tasklet_struct *t)
> >
> > i915_sched_engine_reset_on_empty(engine->sched_engine);
> >
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > }
> >
> > static void cs_irq_handler(struct intel_engine_cs *engine, u16 iir)
> > @@ -322,7 +322,7 @@ static void guc_reset_rewind(struct intel_engine_cs *engine, bool stalled)
> > struct i915_request *rq;
> > unsigned long flags;
> >
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> >
> > /* Push back any incomplete requests for replay after the reset. */
> > rq = execlists_unwind_incomplete_requests(execlists);
> > @@ -336,7 +336,7 @@ static void guc_reset_rewind(struct intel_engine_cs *engine, bool stalled)
> > guc_reset_state(rq->context, engine, rq->head, stalled);
> >
> > out_unlock:
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > }
> >
> > static void guc_reset_cancel(struct intel_engine_cs *engine)
> > @@ -362,10 +362,10 @@ static void guc_reset_cancel(struct intel_engine_cs *engine)
> > * submission's irq state, we also wish to remind ourselves that
> > * it is irq state.)
> > */
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&sched_engine->lock, flags);
> >
> > /* Mark all executing requests as skipped. */
> > - list_for_each_entry(rq, &engine->active.requests, sched.link) {
> > + list_for_each_entry(rq, &sched_engine->requests, sched.link) {
> > i915_request_set_error_once(rq, -EIO);
> > i915_request_mark_complete(rq);
> > }
> > @@ -390,7 +390,7 @@ static void guc_reset_cancel(struct intel_engine_cs *engine)
> > sched_engine->queue_priority_hint = INT_MIN;
> > sched_engine->queue = RB_ROOT_CACHED;
> >
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&sched_engine->lock, flags);
> > }
> >
> > static void guc_reset_finish(struct intel_engine_cs *engine)
> > @@ -539,7 +539,7 @@ static void guc_submit_request(struct i915_request *rq)
> > unsigned long flags;
> >
> > /* Will be called from irq-context when using foreign fences. */
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> >
> > queue_request(engine, rq, rq_prio(rq));
> >
> > @@ -548,7 +548,7 @@ static void guc_submit_request(struct i915_request *rq)
> >
> > tasklet_hi_schedule(&engine->execlists.tasklet);
> >
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > }
> >
> > static void sanitize_hwsp(struct intel_engine_cs *engine)
> > diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> > index 833d3e8b7631..cd005f0a203c 100644
> > --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> > +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> > @@ -1436,12 +1436,12 @@ capture_engine(struct intel_engine_cs *engine,
> > if (!ee)
> > return NULL;
> >
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> > rq = intel_engine_find_active_request(engine);
> > if (rq)
> > capture = intel_engine_coredump_add_request(ee, rq,
> > ATOMIC_MAYFAIL);
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > if (!capture) {
> > kfree(ee);
> > return NULL;
> > diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
> > index 970d8f4986bb..95e859c319ca 100644
> > --- a/drivers/gpu/drm/i915/i915_request.c
> > +++ b/drivers/gpu/drm/i915/i915_request.c
> > @@ -272,11 +272,11 @@ i915_request_active_engine(struct i915_request *rq,
> > * check that we have acquired the lock on the final engine.
> > */
> > locked = READ_ONCE(rq->engine);
> > - spin_lock_irq(&locked->active.lock);
> > + spin_lock_irq(&locked->sched_engine->lock);
> > while (unlikely(locked != (engine = READ_ONCE(rq->engine)))) {
> > - spin_unlock(&locked->active.lock);
> > + spin_unlock(&locked->sched_engine->lock);
> > locked = engine;
> > - spin_lock(&locked->active.lock);
> > + spin_lock(&locked->sched_engine->lock);
> > }
> >
> > if (i915_request_is_active(rq)) {
> > @@ -285,7 +285,7 @@ i915_request_active_engine(struct i915_request *rq,
> > ret = true;
> > }
> >
> > - spin_unlock_irq(&locked->active.lock);
> > + spin_unlock_irq(&locked->sched_engine->lock);
> >
> > return ret;
> > }
> > @@ -302,10 +302,10 @@ static void remove_from_engine(struct i915_request *rq)
> > * check that the rq still belongs to the newly locked engine.
> > */
> > locked = READ_ONCE(rq->engine);
> > - spin_lock_irq(&locked->active.lock);
> > + spin_lock_irq(&locked->sched_engine->lock);
> > while (unlikely(locked != (engine = READ_ONCE(rq->engine)))) {
> > - spin_unlock(&locked->active.lock);
> > - spin_lock(&engine->active.lock);
> > + spin_unlock(&locked->sched_engine->lock);
> > + spin_lock(&engine->sched_engine->lock);
> > locked = engine;
> > }
> > list_del_init(&rq->sched.link);
> > @@ -316,7 +316,7 @@ static void remove_from_engine(struct i915_request *rq)
> > /* Prevent further __await_execution() registering a cb, then flush */
> > set_bit(I915_FENCE_FLAG_ACTIVE, &rq->fence.flags);
> >
> > - spin_unlock_irq(&locked->active.lock);
> > + spin_unlock_irq(&locked->sched_engine->lock);
> >
> > __notify_execute_cb_imm(rq);
> > }
> > @@ -637,7 +637,7 @@ bool __i915_request_submit(struct i915_request *request)
> > RQ_TRACE(request, "\n");
> >
> > GEM_BUG_ON(!irqs_disabled());
> > - lockdep_assert_held(&engine->active.lock);
> > + lockdep_assert_held(&engine->sched_engine->lock);
> >
> > /*
> > * With the advent of preempt-to-busy, we frequently encounter
> > @@ -649,7 +649,7 @@ bool __i915_request_submit(struct i915_request *request)
> > *
> > * We must remove the request from the caller's priority queue,
> > * and the caller must only call us when the request is in their
> > - * priority queue, under the active.lock. This ensures that the
> > + * priority queue, under the sched_engine->lock. This ensures that the
> > * request has *not* yet been retired and we can safely move
> > * the request into the engine->active.list where it will be
> > * dropped upon retiring. (Otherwise if resubmit a *retired*
> > @@ -694,7 +694,7 @@ bool __i915_request_submit(struct i915_request *request)
> > result = true;
> >
> > GEM_BUG_ON(test_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags));
> > - list_move_tail(&request->sched.link, &engine->active.requests);
> > + list_move_tail(&request->sched.link, &engine->sched_engine->requests);
> > active:
> > clear_bit(I915_FENCE_FLAG_PQUEUE, &request->fence.flags);
> > set_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags);
> > @@ -724,11 +724,11 @@ void i915_request_submit(struct i915_request *request)
> > unsigned long flags;
> >
> > /* Will be called from irq-context when using foreign fences. */
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> >
> > __i915_request_submit(request);
> >
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > }
> >
> > void __i915_request_unsubmit(struct i915_request *request)
> > @@ -742,7 +742,7 @@ void __i915_request_unsubmit(struct i915_request *request)
> > RQ_TRACE(request, "\n");
> >
> > GEM_BUG_ON(!irqs_disabled());
> > - lockdep_assert_held(&engine->active.lock);
> > + lockdep_assert_held(&engine->sched_engine->lock);
> >
> > /*
> > * Before we remove this breadcrumb from the signal list, we have
> > @@ -775,11 +775,11 @@ void i915_request_unsubmit(struct i915_request *request)
> > unsigned long flags;
> >
> > /* Will be called from irq-context when using foreign fences. */
> > - spin_lock_irqsave(&engine->active.lock, flags);
> > + spin_lock_irqsave(&engine->sched_engine->lock, flags);
> >
> > __i915_request_unsubmit(request);
> >
> > - spin_unlock_irqrestore(&engine->active.lock, flags);
> > + spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > }
> >
> > static void __cancel_request(struct i915_request *rq)
> > diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
> > index 270f6cd37650..239964bec1fa 100644
> > --- a/drivers/gpu/drm/i915/i915_request.h
> > +++ b/drivers/gpu/drm/i915/i915_request.h
> > @@ -613,7 +613,7 @@ i915_request_active_timeline(const struct i915_request *rq)
> > * this submission.
> > */
> > return rcu_dereference_protected(rq->timeline,
> > - lockdep_is_held(&rq->engine->active.lock));
> > + lockdep_is_held(&rq->engine->sched_engine->lock));
> > }
> >
> > static inline u32
> > diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
> > index 4953874a9ba6..4bc6969f6a97 100644
> > --- a/drivers/gpu/drm/i915/i915_scheduler.c
> > +++ b/drivers/gpu/drm/i915/i915_scheduler.c
> > @@ -68,7 +68,7 @@ i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio)
> > struct rb_node **parent, *rb;
> > bool first = true;
> >
> > - lockdep_assert_held(&engine->active.lock);
> > + lockdep_assert_held(&engine->sched_engine->lock);
> > assert_priolists(sched_engine);
> >
> > if (unlikely(sched_engine->no_priolist))
> > @@ -147,9 +147,9 @@ sched_lock_engine(const struct i915_sched_node *node,
> > * check that the rq still belongs to the newly locked engine.
> > */
> > while (locked != (engine = READ_ONCE(rq->engine))) {
> > - spin_unlock(&locked->active.lock);
> > + spin_unlock(&locked->sched_engine->lock);
> > memset(cache, 0, sizeof(*cache));
> > - spin_lock(&engine->active.lock);
> > + spin_lock(&engine->sched_engine->lock);
> > locked = engine;
> > }
> >
> > @@ -296,7 +296,7 @@ static void __i915_schedule(struct i915_sched_node *node,
> >
> > memset(&cache, 0, sizeof(cache));
> > engine = node_to_request(node)->engine;
> > - spin_lock(&engine->active.lock);
> > + spin_lock(&engine->sched_engine->lock);
> >
> > /* Fifo and depth-first replacement ensure our deps execute before us */
> > engine = sched_lock_engine(node, engine, &cache);
> > @@ -305,7 +305,7 @@ static void __i915_schedule(struct i915_sched_node *node,
> >
> > node = dep->signaler;
> > engine = sched_lock_engine(node, engine, &cache);
> > - lockdep_assert_held(&engine->active.lock);
> > + lockdep_assert_held(&engine->sched_engine->lock);
> >
> > /* Recheck after acquiring the engine->timeline.lock */
> > if (prio <= node->attr.priority || node_signaled(node))
> > @@ -338,7 +338,7 @@ static void __i915_schedule(struct i915_sched_node *node,
> > kick_submission(engine, node_to_request(node), prio);
> > }
> >
> > - spin_unlock(&engine->active.lock);
> > + spin_unlock(&engine->sched_engine->lock);
> > }
> >
> > void i915_schedule(struct i915_request *rq, const struct i915_sched_attr *attr)
> > @@ -511,6 +511,24 @@ i915_sched_engine_create(unsigned int subclass)
> > sched_engine->queue = RB_ROOT_CACHED;
> > sched_engine->queue_priority_hint = INT_MIN;
> >
> > + INIT_LIST_HEAD(&sched_engine->requests);
> > + INIT_LIST_HEAD(&sched_engine->hold);
> > +
> > + spin_lock_init(&sched_engine->lock);
> > + lockdep_set_subclass(&sched_engine->lock, subclass);
> > +
> > + /*
> > + * Due to an interesting quirk in lockdep's internal debug tracking,
> > + * after setting a subclass we must ensure the lock is used. Otherwise,
> > + * nr_unused_locks is incremented once too often.
> > + */
> > +#ifdef CONFIG_DEBUG_LOCK_ALLOC
> > + local_irq_disable();
> > + lock_map_acquire(&sched_engine->lock.dep_map);
> > + lock_map_release(&sched_engine->lock.dep_map);
> > + local_irq_enable();
> > +#endif
> > +
> > return sched_engine;
> > }
> >
> > diff --git a/drivers/gpu/drm/i915/i915_scheduler_types.h b/drivers/gpu/drm/i915/i915_scheduler_types.h
> > index 16a054e67760..5cb0b1c98d6b 100644
> > --- a/drivers/gpu/drm/i915/i915_scheduler_types.h
> > +++ b/drivers/gpu/drm/i915/i915_scheduler_types.h
> > @@ -94,6 +94,15 @@ struct i915_dependency {
> > struct i915_sched_engine {
> > struct kref ref;
> >
> > + /**
> > + * @lock: protects requests in priority lists, requests, hold and
> > + * tasklet while running
>
> To be clear, this protects other stuff in this struct, right? Not
> just requests and hold?
>
Yea, this lock is kinda mess. It protects the request when it is in the
priority list (struct i915_priolist) and these lists. It also is the
submission lock, e.g. you have to hold this lock when submitting /
unsubmitting the request. It also is used for some timeline RCU thing I
don't fully understand.
In the GuC submission code this lock is used as a submission lock for
consistency with the execlist code.
Once we go the DRM scheduler these lists go away, at least with GuC
submission. Also a submission lock really isn't needed as the backend
will have a single entry point rather and only 1 request is allowed in
the backend at time. Hoping we can push this lock + all of these
structures in an execlist specific structure + only use it in
intel_execlists_submission.c and be done with it.
> Otherwise, this looks mechanically correct. Still not getting the big
Anyways, there is not a change in behavior here.
Matt
> picture yet.
>
> --Jason
>
>
> > + */
> > + spinlock_t lock;
> > +
> > + struct list_head requests;
> > + struct list_head hold; /* ready requests, but on hold */
> > +
> > /**
> > * @default_priolist: priority list for I915_PRIORITY_NORMAL
> > */
> > --
> > 2.28.0
> >
