[Intel-gfx] [PATCH 1/9] drm/i915: Move priolist to new i915_sched_engine object
Jason Ekstrand
jason at jlekstrand.net
Fri Jun 4 18:14:31 UTC 2021
On Fri, Jun 4, 2021 at 12:59 PM Matthew Brost <matthew.brost at intel.com> wrote:
>
> On Fri, Jun 04, 2021 at 12:51:43PM -0500, Jason Ekstrand wrote:
> > On Fri, Jun 4, 2021 at 12:42 PM Matthew Brost <matthew.brost at intel.com> wrote:
> > >
> > > On Fri, Jun 04, 2021 at 12:38:22PM -0500, Jason Ekstrand wrote:
> > > > On Thu, Jun 3, 2021 at 4:09 PM Matthew Brost <matthew.brost at intel.com> wrote:
> > > > >
> > > > > Introduce i915_sched_engine object which is lower level data structure
> > > > > that i915_scheduler / generic code can operate on without touching
> > > > > execlist specific structures. This allows additional submission backends
> > > > > to be added without breaking the layering.
> > > > >
> > > > > This is a bit of detour to integrating the i915 with the DRM scheduler
> > > > > but this object will still exist when the DRM scheduler lands in the
> > > > > i915. It will however look a bit different. It will encapsulate the
> > > > > drm_gpu_scheduler object plus and common variables (to the backends)
> > > > > related to scheduling. Regardless this is a step in the right direction.
> > > > >
> > > > > This patch starts the aforementioned transition by moving the the
> > > > > priolist into the i915_sched_engine object.
> > > > >
> > > > > Signed-off-by: Matthew Brost <matthew.brost at intel.com>
> > > > > ---
> > > > > drivers/gpu/drm/i915/gt/intel_engine_cs.c | 14 +++-
> > > > > drivers/gpu/drm/i915/gt/intel_engine_pm.c | 4 +-
> > > > > drivers/gpu/drm/i915/gt/intel_engine_types.h | 30 +------
> > > > > .../drm/i915/gt/intel_execlists_submission.c | 81 +++++++++++--------
> > > > > drivers/gpu/drm/i915/gt/mock_engine.c | 9 ++-
> > > > > .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 19 ++---
> > > > > drivers/gpu/drm/i915/i915_scheduler.c | 51 +++++++++---
> > > > > drivers/gpu/drm/i915/i915_scheduler.h | 18 +++++
> > > > > drivers/gpu/drm/i915/i915_scheduler_types.h | 33 ++++++++
> > > > > 9 files changed, 169 insertions(+), 90 deletions(-)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > > > > index 3f9a811eb02b..d0f3814440f6 100644
> > > > > --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > > > > +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > > > > @@ -583,9 +583,6 @@ void intel_engine_init_execlists(struct intel_engine_cs *engine)
> > > > > memset(execlists->pending, 0, sizeof(execlists->pending));
> > > > > execlists->active =
> > > > > memset(execlists->inflight, 0, sizeof(execlists->inflight));
> > > > > -
> > > > > - execlists->queue_priority_hint = INT_MIN;
> > > > > - execlists->queue = RB_ROOT_CACHED;
> > > > > }
> > > > >
> > > > > static void cleanup_status_page(struct intel_engine_cs *engine)
> > > > > @@ -712,6 +709,12 @@ static int engine_setup_common(struct intel_engine_cs *engine)
> > > > > goto err_status;
> > > > > }
> > > > >
> > > > > + engine->sched_engine = i915_sched_engine_create(ENGINE_PHYSICAL);
> > > > > + if (!engine->sched_engine) {
> > > > > + err = -ENOMEM;
> > > > > + goto err_sched_engine;
> > > > > + }
> > > > > +
> > > > > err = intel_engine_init_cmd_parser(engine);
> > > > > if (err)
> > > > > goto err_cmd_parser;
> > > > > @@ -735,6 +738,8 @@ static int engine_setup_common(struct intel_engine_cs *engine)
> > > > > return 0;
> > > > >
> > > > > err_cmd_parser:
> > > > > + i915_sched_engine_put(engine->sched_engine);
> > > > > +err_sched_engine:
> > > > > intel_breadcrumbs_free(engine->breadcrumbs);
> > > > > err_status:
> > > > > cleanup_status_page(engine);
> > > > > @@ -958,6 +963,7 @@ void intel_engine_cleanup_common(struct intel_engine_cs *engine)
> > > > > GEM_BUG_ON(!list_empty(&engine->active.requests));
> > > > > tasklet_kill(&engine->execlists.tasklet); /* flush the callback */
> > > > >
> > > > > + i915_sched_engine_put(engine->sched_engine);
> > > > > intel_breadcrumbs_free(engine->breadcrumbs);
> > > > >
> > > > > intel_engine_fini_retire(engine);
> > > > > @@ -1281,7 +1287,7 @@ bool intel_engine_is_idle(struct intel_engine_cs *engine)
> > > > > intel_engine_flush_submission(engine);
> > > > >
> > > > > /* ELSP is empty, but there are ready requests? E.g. after reset */
> > > > > - if (!RB_EMPTY_ROOT(&engine->execlists.queue.rb_root))
> > > > > + if (!RB_EMPTY_ROOT(&engine->sched_engine->queue.rb_root))
> > > > > return false;
> > > > >
> > > > > /* Ring stopped? */
> > > > > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.c b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
> > > > > index 47f4397095e5..b6a00dd72808 100644
> > > > > --- a/drivers/gpu/drm/i915/gt/intel_engine_pm.c
> > > > > +++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
> > > > > @@ -275,12 +275,12 @@ static int __engine_park(struct intel_wakeref *wf)
> > > > > intel_breadcrumbs_park(engine->breadcrumbs);
> > > > >
> > > > > /* Must be reset upon idling, or we may miss the busy wakeup. */
> > > > > - GEM_BUG_ON(engine->execlists.queue_priority_hint != INT_MIN);
> > > > > + GEM_BUG_ON(engine->sched_engine->queue_priority_hint != INT_MIN);
> > > > >
> > > > > if (engine->park)
> > > > > engine->park(engine);
> > > > >
> > > > > - engine->execlists.no_priolist = false;
> > > > > + engine->sched_engine->no_priolist = false;
> > > > >
> > > > > /* While gt calls i915_vma_parked(), we have to break the lock cycle */
> > > > > intel_gt_pm_put_async(engine->gt);
> > > > > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > > > > index 9ef349cd5cea..86b41ddec373 100644
> > > > > --- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > > > > +++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > > > > @@ -59,6 +59,7 @@ struct drm_i915_reg_table;
> > > > > struct i915_gem_context;
> > > > > struct i915_request;
> > > > > struct i915_sched_attr;
> > > > > +struct i915_sched_engine;
> > > > > struct intel_gt;
> > > > > struct intel_ring;
> > > > > struct intel_uncore;
> > > > > @@ -152,11 +153,6 @@ struct intel_engine_execlists {
> > > > > */
> > > > > struct timer_list preempt;
> > > > >
> > > > > - /**
> > > > > - * @default_priolist: priority list for I915_PRIORITY_NORMAL
> > > > > - */
> > > > > - struct i915_priolist default_priolist;
> > > > > -
> > > > > /**
> > > > > * @ccid: identifier for contexts submitted to this engine
> > > > > */
> > > > > @@ -191,11 +187,6 @@ struct intel_engine_execlists {
> > > > > */
> > > > > u32 reset_ccid;
> > > > >
> > > > > - /**
> > > > > - * @no_priolist: priority lists disabled
> > > > > - */
> > > > > - bool no_priolist;
> > > > > -
> > > > > /**
> > > > > * @submit_reg: gen-specific execlist submission register
> > > > > * set to the ExecList Submission Port (elsp) register pre-Gen11 and to
> > > > > @@ -238,23 +229,8 @@ struct intel_engine_execlists {
> > > > > unsigned int port_mask;
> > > > >
> > > > > /**
> > > > > - * @queue_priority_hint: Highest pending priority.
> > > > > - *
> > > > > - * When we add requests into the queue, or adjust the priority of
> > > > > - * executing requests, we compute the maximum priority of those
> > > > > - * pending requests. We can then use this value to determine if
> > > > > - * we need to preempt the executing requests to service the queue.
> > > > > - * However, since the we may have recorded the priority of an inflight
> > > > > - * request we wanted to preempt but since completed, at the time of
> > > > > - * dequeuing the priority hint may no longer may match the highest
> > > > > - * available request priority.
> > > > > + * @virtual: virtual of requests, in priority lists
> > > >
> > > > Having trouble parsing this. Did you mean "queue of virtual
> > > > requests"? Or maybe "virtual queue of requests"?
> > > >
> > >
> > > Yep, this doesn't really make sense. How about:
> > > 'queue of requests on a virtual engine, in priority lists'
> >
> > I'm not sure what "in priority lists" means.
> >
>
> Ah, this is confusing to explain. Let me try to this again.
>
> 'Queue of requets on a virtual engine, sorted by priority. Each RB entry
> is a i915_priolist containing a list of requests of the same priority.'
Way better! Maybe throw a "struct" in front of "i915_priolist" so
that kerneldoc will hyperlink properly.
--Jason
>
> Matt
>
>
> > --Jason
> >
> > > > > */
> > > > > - int queue_priority_hint;
> > > > > -
> > > > > - /**
> > > > > - * @queue: queue of requests, in priority lists
> > > > > - */
> > > > > - struct rb_root_cached queue;
> > > > > struct rb_root_cached virtual;
> > > > >
> > > > > /**
> > > > > @@ -332,6 +308,8 @@ struct intel_engine_cs {
> > > > > 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 */
> > > > > struct i915_request *request_pool;
> > > > >
> > > > > diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > > > > index 8db200422950..d1dc1db3e378 100644
> > > > > --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > > > > +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > > > > @@ -273,11 +273,11 @@ static int effective_prio(const struct i915_request *rq)
> > > > > return prio;
> > > > > }
> > > > >
> > > > > -static int queue_prio(const struct intel_engine_execlists *execlists)
> > > > > +static int queue_prio(const struct i915_sched_engine *sched_engine)
> > > > > {
> > > > > struct rb_node *rb;
> > > > >
> > > > > - rb = rb_first_cached(&execlists->queue);
> > > > > + rb = rb_first_cached(&sched_engine->queue);
> > > > > if (!rb)
> > > > > return INT_MIN;
> > > > >
> > > > > @@ -318,7 +318,7 @@ static bool need_preempt(const struct intel_engine_cs *engine,
> > > > > * to preserve FIFO ordering of dependencies.
> > > > > */
> > > > > last_prio = max(effective_prio(rq), I915_PRIORITY_NORMAL - 1);
> > > > > - if (engine->execlists.queue_priority_hint <= last_prio)
> > > > > + if (engine->sched_engine->queue_priority_hint <= last_prio)
> > > > > return false;
> > > > >
> > > > > /*
> > > > > @@ -340,7 +340,7 @@ static bool need_preempt(const struct intel_engine_cs *engine,
> > > > > * context, it's priority would not exceed ELSP[0] aka last_prio.
> > > > > */
> > > > > return max(virtual_prio(&engine->execlists),
> > > > > - queue_prio(&engine->execlists)) > last_prio;
> > > > > + queue_prio(engine->sched_engine)) > last_prio;
> > > > > }
> > > > >
> > > > > __maybe_unused static bool
> > > > > @@ -384,7 +384,7 @@ __unwind_incomplete_requests(struct intel_engine_cs *engine)
> > > > > prio = rq_prio(rq);
> > > > > pl = i915_sched_lookup_priolist(engine, prio);
> > > > > }
> > > > > - GEM_BUG_ON(RB_EMPTY_ROOT(&engine->execlists.queue.rb_root));
> > > > > + GEM_BUG_ON(RB_EMPTY_ROOT(&engine->sched_engine->queue.rb_root));
> > > > >
> > > > > list_move(&rq->sched.link, pl);
> > > > > set_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
> > > > > @@ -1139,7 +1139,7 @@ static bool needs_timeslice(const struct intel_engine_cs *engine,
> > > > > }
> > > > >
> > > > > /* Otherwise, ELSP[0] is by itself, but may be waiting in the queue */
> > > > > - if (!RB_EMPTY_ROOT(&engine->execlists.queue.rb_root)) {
> > > > > + if (!RB_EMPTY_ROOT(&engine->sched_engine->queue.rb_root)) {
> > > > > ENGINE_TRACE(engine, "timeslice required for queue\n");
> > > > > return true;
> > > > > }
> > > > > @@ -1236,6 +1236,7 @@ static bool completed(const struct i915_request *rq)
> > > > > static void execlists_dequeue(struct intel_engine_cs *engine)
> > > > > {
> > > > > struct intel_engine_execlists * const execlists = &engine->execlists;
> > > > > + struct i915_sched_engine * const sched_engine = engine->sched_engine;
> > > > > struct i915_request **port = execlists->pending;
> > > > > struct i915_request ** const last_port = port + execlists->port_mask;
> > > > > struct i915_request *last, * const *active;
> > > > > @@ -1287,7 +1288,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > > > > last->fence.context,
> > > > > last->fence.seqno,
> > > > > last->sched.attr.priority,
> > > > > - execlists->queue_priority_hint);
> > > > > + sched_engine->queue_priority_hint);
> > > > > record_preemption(execlists);
> > > > >
> > > > > /*
> > > > > @@ -1313,7 +1314,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > > > > yesno(timer_expired(&execlists->timer)),
> > > > > last->fence.context, last->fence.seqno,
> > > > > rq_prio(last),
> > > > > - execlists->queue_priority_hint,
> > > > > + sched_engine->queue_priority_hint,
> > > > > yesno(timeslice_yield(execlists, last)));
> > > > >
> > > > > /*
> > > > > @@ -1384,7 +1385,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > > > > GEM_BUG_ON(rq->engine != &ve->base);
> > > > > GEM_BUG_ON(rq->context != &ve->context);
> > > > >
> > > > > - if (unlikely(rq_prio(rq) < queue_prio(execlists))) {
> > > > > + if (unlikely(rq_prio(rq) < queue_prio(sched_engine))) {
> > > > > spin_unlock(&ve->base.active.lock);
> > > > > break;
> > > > > }
> > > > > @@ -1405,7 +1406,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > > > > yesno(engine != ve->siblings[0]));
> > > > >
> > > > > WRITE_ONCE(ve->request, NULL);
> > > > > - WRITE_ONCE(ve->base.execlists.queue_priority_hint, INT_MIN);
> > > > > + WRITE_ONCE(ve->base.sched_engine->queue_priority_hint, INT_MIN);
> > > > >
> > > > > rb = &ve->nodes[engine->id].rb;
> > > > > rb_erase_cached(rb, &execlists->virtual);
> > > > > @@ -1450,7 +1451,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > > > > break;
> > > > > }
> > > > >
> > > > > - while ((rb = rb_first_cached(&execlists->queue))) {
> > > > > + while ((rb = rb_first_cached(&sched_engine->queue))) {
> > > > > struct i915_priolist *p = to_priolist(rb);
> > > > > struct i915_request *rq, *rn;
> > > > >
> > > > > @@ -1529,7 +1530,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > > > > }
> > > > > }
> > > > >
> > > > > - rb_erase_cached(&p->node, &execlists->queue);
> > > > > + rb_erase_cached(&p->node, &sched_engine->queue);
> > > > > i915_priolist_free(p);
> > > > > }
> > > > > done:
> > > > > @@ -1551,7 +1552,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
> > > > > * request triggering preemption on the next dequeue (or subsequent
> > > > > * interrupt for secondary ports).
> > > > > */
> > > > > - execlists->queue_priority_hint = queue_prio(execlists);
> > > > > + sched_engine->queue_priority_hint = queue_prio(sched_engine);
> > > > > spin_unlock(&engine->active.lock);
> > > > >
> > > > > /*
> > > > > @@ -2123,8 +2124,8 @@ static void execlists_unhold(struct intel_engine_cs *engine,
> > > > > */
> > > > > __execlists_unhold(rq);
> > > > >
> > > > > - if (rq_prio(rq) > engine->execlists.queue_priority_hint) {
> > > > > - engine->execlists.queue_priority_hint = rq_prio(rq);
> > > > > + if (rq_prio(rq) > engine->sched_engine->queue_priority_hint) {
> > > > > + engine->sched_engine->queue_priority_hint = rq_prio(rq);
> > > > > tasklet_hi_schedule(&engine->execlists.tasklet);
> > > > > }
> > > > >
> > > > > @@ -2455,12 +2456,12 @@ static void queue_request(struct intel_engine_cs *engine,
> > > > > static bool submit_queue(struct intel_engine_cs *engine,
> > > > > const struct i915_request *rq)
> > > > > {
> > > > > - struct intel_engine_execlists *execlists = &engine->execlists;
> > > > > + struct i915_sched_engine *sched_engine = engine->sched_engine;
> > > > >
> > > > > - if (rq_prio(rq) <= execlists->queue_priority_hint)
> > > > > + if (rq_prio(rq) <= sched_engine->queue_priority_hint)
> > > > > return false;
> > > > >
> > > > > - execlists->queue_priority_hint = rq_prio(rq);
> > > > > + sched_engine->queue_priority_hint = rq_prio(rq);
> > > > > return true;
> > > > > }
> > > > >
> > > > > @@ -2486,7 +2487,7 @@ static void execlists_submit_request(struct i915_request *request)
> > > > > } else {
> > > > > queue_request(engine, request);
> > > > >
> > > > > - GEM_BUG_ON(RB_EMPTY_ROOT(&engine->execlists.queue.rb_root));
> > > > > + GEM_BUG_ON(RB_EMPTY_ROOT(&engine->sched_engine->queue.rb_root));
> > > > > GEM_BUG_ON(list_empty(&request->sched.link));
> > > > >
> > > > > if (submit_queue(engine, request))
> > > > > @@ -2969,12 +2970,13 @@ static void nop_submission_tasklet(struct tasklet_struct *t)
> > > > > from_tasklet(engine, t, execlists.tasklet);
> > > > >
> > > > > /* The driver is wedged; don't process any more events. */
> > > > > - WRITE_ONCE(engine->execlists.queue_priority_hint, INT_MIN);
> > > > > + WRITE_ONCE(engine->sched_engine->queue_priority_hint, INT_MIN);
> > > > > }
> > > > >
> > > > > static void execlists_reset_cancel(struct intel_engine_cs *engine)
> > > > > {
> > > > > struct intel_engine_execlists * const execlists = &engine->execlists;
> > > > > + struct i915_sched_engine * const sched_engine = engine->sched_engine;
> > > > > struct i915_request *rq, *rn;
> > > > > struct rb_node *rb;
> > > > > unsigned long flags;
> > > > > @@ -3006,7 +3008,7 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
> > > > > intel_engine_signal_breadcrumbs(engine);
> > > > >
> > > > > /* Flush the queued requests to the timeline list (for retiring). */
> > > > > - while ((rb = rb_first_cached(&execlists->queue))) {
> > > > > + while ((rb = rb_first_cached(&sched_engine->queue))) {
> > > > > struct i915_priolist *p = to_priolist(rb);
> > > > >
> > > > > priolist_for_each_request_consume(rq, rn, p) {
> > > > > @@ -3016,7 +3018,7 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
> > > > > }
> > > > > }
> > > > >
> > > > > - rb_erase_cached(&p->node, &execlists->queue);
> > > > > + rb_erase_cached(&p->node, &sched_engine->queue);
> > > > > i915_priolist_free(p);
> > > > > }
> > > > >
> > > > > @@ -3042,15 +3044,15 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
> > > > > }
> > > > > i915_request_put(rq);
> > > > >
> > > > > - ve->base.execlists.queue_priority_hint = INT_MIN;
> > > > > + ve->base.sched_engine->queue_priority_hint = INT_MIN;
> > > > > }
> > > > > spin_unlock(&ve->base.active.lock);
> > > > > }
> > > > >
> > > > > /* Remaining _unready_ requests will be nop'ed when submitted */
> > > > >
> > > > > - execlists->queue_priority_hint = INT_MIN;
> > > > > - execlists->queue = RB_ROOT_CACHED;
> > > > > + sched_engine->queue_priority_hint = INT_MIN;
> > > > > + sched_engine->queue = RB_ROOT_CACHED;
> > > > >
> > > > > GEM_BUG_ON(__tasklet_is_enabled(&execlists->tasklet));
> > > > > execlists->tasklet.callback = nop_submission_tasklet;
> > > > > @@ -3286,7 +3288,7 @@ int intel_execlists_submission_setup(struct intel_engine_cs *engine)
> > > > >
> > > > > static struct list_head *virtual_queue(struct virtual_engine *ve)
> > > > > {
> > > > > - return &ve->base.execlists.default_priolist.requests;
> > > > > + return &ve->base.sched_engine->default_priolist.requests;
> > > > > }
> > > > >
> > > > > static void rcu_virtual_context_destroy(struct work_struct *wrk)
> > > > > @@ -3344,7 +3346,10 @@ static void rcu_virtual_context_destroy(struct work_struct *wrk)
> > > > > lrc_fini(&ve->context);
> > > > > intel_context_fini(&ve->context);
> > > > >
> > > > > - intel_breadcrumbs_free(ve->base.breadcrumbs);
> > > > > + if (ve->base.breadcrumbs)
> > > > > + intel_breadcrumbs_free(ve->base.breadcrumbs);
> > > > > + if (ve->base.sched_engine)
> > > > > + i915_sched_engine_put(ve->base.sched_engine);
> > > >
> > > > Will either of these ever actually be NULL? The first line or two
> > > > seems to indicate that breadcrumbs never is.
> > > >
> > > > > intel_engine_free_request_pool(&ve->base);
> > > > >
> > > > > kfree(ve->bonds);
> > > > > @@ -3475,7 +3480,7 @@ static intel_engine_mask_t virtual_submission_mask(struct virtual_engine *ve)
> > > > >
> > > > > ENGINE_TRACE(&ve->base, "rq=%llx:%lld, mask=%x, prio=%d\n",
> > > > > rq->fence.context, rq->fence.seqno,
> > > > > - mask, ve->base.execlists.queue_priority_hint);
> > > > > + mask, ve->base.sched_engine->queue_priority_hint);
> > > > >
> > > > > return mask;
> > > > > }
> > > > > @@ -3484,7 +3489,7 @@ static void virtual_submission_tasklet(struct tasklet_struct *t)
> > > > > {
> > > > > struct virtual_engine * const ve =
> > > > > from_tasklet(ve, t, base.execlists.tasklet);
> > > > > - const int prio = READ_ONCE(ve->base.execlists.queue_priority_hint);
> > > > > + const int prio = READ_ONCE(ve->base.sched_engine->queue_priority_hint);
> > > > > intel_engine_mask_t mask;
> > > > > unsigned int n;
> > > > >
> > > > > @@ -3552,7 +3557,7 @@ static void virtual_submission_tasklet(struct tasklet_struct *t)
> > > > > submit_engine:
> > > > > GEM_BUG_ON(RB_EMPTY_NODE(&node->rb));
> > > > > node->prio = prio;
> > > > > - if (first && prio > sibling->execlists.queue_priority_hint)
> > > > > + if (first && prio > sibling->sched_engine->queue_priority_hint)
> > > > > tasklet_hi_schedule(&sibling->execlists.tasklet);
> > > > >
> > > > > unlock_engine:
> > > > > @@ -3588,7 +3593,7 @@ static void virtual_submit_request(struct i915_request *rq)
> > > > > i915_request_put(ve->request);
> > > > > }
> > > > >
> > > > > - ve->base.execlists.queue_priority_hint = rq_prio(rq);
> > > > > + ve->base.sched_engine->queue_priority_hint = rq_prio(rq);
> > > > > ve->request = i915_request_get(rq);
> > > > >
> > > > > GEM_BUG_ON(!list_empty(virtual_queue(ve)));
> > > > > @@ -3684,6 +3689,12 @@ intel_execlists_create_virtual(struct intel_engine_cs **siblings,
> > > > > intel_engine_init_active(&ve->base, ENGINE_VIRTUAL);
> > > > > intel_engine_init_execlists(&ve->base);
> > > > >
> > > > > + ve->base.sched_engine = i915_sched_engine_create(ENGINE_VIRTUAL);
> > > > > + if (!ve->base.sched_engine) {
> > > > > + err = -ENOMEM;
> > > > > + goto err_put;
> > > > > + }
> > > > > +
> > > > > ve->base.cops = &virtual_context_ops;
> > > > > ve->base.request_alloc = execlists_request_alloc;
> > > > >
> > > > > @@ -3692,7 +3703,6 @@ intel_execlists_create_virtual(struct intel_engine_cs **siblings,
> > > > > ve->base.bond_execute = virtual_bond_execute;
> > > > >
> > > > > INIT_LIST_HEAD(virtual_queue(ve));
> > > > > - ve->base.execlists.queue_priority_hint = INT_MIN;
> > > > > tasklet_setup(&ve->base.execlists.tasklet, virtual_submission_tasklet);
> > > > >
> > > > > intel_context_init(&ve->context, &ve->base);
> > > > > @@ -3849,6 +3859,7 @@ 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_request *rq, *last;
> > > > > unsigned long flags;
> > > > > unsigned int count;
> > > > > @@ -3873,13 +3884,13 @@ void intel_execlists_show_requests(struct intel_engine_cs *engine,
> > > > > show_request(m, last, "\t\t", 0);
> > > > > }
> > > > >
> > > > > - if (execlists->queue_priority_hint != INT_MIN)
> > > > > + if (sched_engine->queue_priority_hint != INT_MIN)
> > > > > drm_printf(m, "\t\tQueue priority hint: %d\n",
> > > > > - READ_ONCE(execlists->queue_priority_hint));
> > > > > + READ_ONCE(sched_engine->queue_priority_hint));
> > > > >
> > > > > last = NULL;
> > > > > count = 0;
> > > > > - for (rb = rb_first_cached(&execlists->queue); rb; rb = rb_next(rb)) {
> > > > > + for (rb = rb_first_cached(&sched_engine->queue); rb; rb = rb_next(rb)) {
> > > > > struct i915_priolist *p = rb_entry(rb, typeof(*p), node);
> > > > >
> > > > > priolist_for_each_request(rq, p) {
> > > > > diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
> > > > > index 32589c6625e1..b1fdba13e900 100644
> > > > > --- a/drivers/gpu/drm/i915/gt/mock_engine.c
> > > > > +++ b/drivers/gpu/drm/i915/gt/mock_engine.c
> > > > > @@ -283,6 +283,7 @@ static void mock_engine_release(struct intel_engine_cs *engine)
> > > > >
> > > > > GEM_BUG_ON(timer_pending(&mock->hw_delay));
> > > > >
> > > > > + i915_sched_engine_put(engine->sched_engine);
> > > > > intel_breadcrumbs_free(engine->breadcrumbs);
> > > > >
> > > > > intel_context_unpin(engine->kernel_context);
> > > > > @@ -345,6 +346,10 @@ int mock_engine_init(struct intel_engine_cs *engine)
> > > > > {
> > > > > struct intel_context *ce;
> > > > >
> > > > > + engine->sched_engine = i915_sched_engine_create(ENGINE_MOCK);
> > > > > + if (!engine->sched_engine)
> > > > > + return -ENOMEM;
> > > > > +
> > > > > intel_engine_init_active(engine, ENGINE_MOCK);
> > > > > intel_engine_init_execlists(engine);
> > > > > intel_engine_init__pm(engine);
> > > > > @@ -352,7 +357,7 @@ int mock_engine_init(struct intel_engine_cs *engine)
> > > > >
> > > > > engine->breadcrumbs = intel_breadcrumbs_create(NULL);
> > > > > if (!engine->breadcrumbs)
> > > > > - return -ENOMEM;
> > > > > + goto err_schedule;
> > > > >
> > > > > ce = create_kernel_context(engine);
> > > > > if (IS_ERR(ce))
> > > > > @@ -366,6 +371,8 @@ int mock_engine_init(struct intel_engine_cs *engine)
> > > > >
> > > > > err_breadcrumbs:
> > > > > intel_breadcrumbs_free(engine->breadcrumbs);
> > > > > +err_schedule:
> > > > > + i915_sched_engine_put(engine->sched_engine);
> > > > > return -ENOMEM;
> > > > > }
> > > > >
> > > > > 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 335719f17490..d42dea79ee64 100644
> > > > > --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > > > > +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > > > > @@ -182,6 +182,7 @@ static void schedule_out(struct i915_request *rq)
> > > > > static void __guc_dequeue(struct intel_engine_cs *engine)
> > > > > {
> > > > > struct intel_engine_execlists * const execlists = &engine->execlists;
> > > > > + struct i915_sched_engine * const sched_engine = engine->sched_engine;
> > > > > struct i915_request **first = execlists->inflight;
> > > > > struct i915_request ** const last_port = first + execlists->port_mask;
> > > > > struct i915_request *last = first[0];
> > > > > @@ -204,7 +205,7 @@ static void __guc_dequeue(struct intel_engine_cs *engine)
> > > > > * event.
> > > > > */
> > > > > port = first;
> > > > > - while ((rb = rb_first_cached(&execlists->queue))) {
> > > > > + while ((rb = rb_first_cached(&sched_engine->queue))) {
> > > > > struct i915_priolist *p = to_priolist(rb);
> > > > > struct i915_request *rq, *rn;
> > > > >
> > > > > @@ -224,11 +225,11 @@ static void __guc_dequeue(struct intel_engine_cs *engine)
> > > > > last = rq;
> > > > > }
> > > > >
> > > > > - rb_erase_cached(&p->node, &execlists->queue);
> > > > > + rb_erase_cached(&p->node, &sched_engine->queue);
> > > > > i915_priolist_free(p);
> > > > > }
> > > > > done:
> > > > > - execlists->queue_priority_hint =
> > > > > + sched_engine->queue_priority_hint =
> > > > > rb ? to_priolist(rb)->priority : INT_MIN;
> > > > > if (submit) {
> > > > > *port = schedule_in(last, port - execlists->inflight);
> > > > > @@ -338,7 +339,7 @@ static void guc_reset_rewind(struct intel_engine_cs *engine, bool stalled)
> > > > >
> > > > > static void guc_reset_cancel(struct intel_engine_cs *engine)
> > > > > {
> > > > > - struct intel_engine_execlists * const execlists = &engine->execlists;
> > > > > + struct i915_sched_engine * const sched_engine = engine->sched_engine;
> > > > > struct i915_request *rq, *rn;
> > > > > struct rb_node *rb;
> > > > > unsigned long flags;
> > > > > @@ -368,7 +369,7 @@ static void guc_reset_cancel(struct intel_engine_cs *engine)
> > > > > }
> > > > >
> > > > > /* Flush the queued requests to the timeline list (for retiring). */
> > > > > - while ((rb = rb_first_cached(&execlists->queue))) {
> > > > > + while ((rb = rb_first_cached(&sched_engine->queue))) {
> > > > > struct i915_priolist *p = to_priolist(rb);
> > > > >
> > > > > priolist_for_each_request_consume(rq, rn, p) {
> > > > > @@ -378,14 +379,14 @@ static void guc_reset_cancel(struct intel_engine_cs *engine)
> > > > > i915_request_mark_complete(rq);
> > > > > }
> > > > >
> > > > > - rb_erase_cached(&p->node, &execlists->queue);
> > > > > + rb_erase_cached(&p->node, &sched_engine->queue);
> > > > > i915_priolist_free(p);
> > > > > }
> > > > >
> > > > > /* Remaining _unready_ requests will be nop'ed when submitted */
> > > > >
> > > > > - execlists->queue_priority_hint = INT_MIN;
> > > > > - execlists->queue = RB_ROOT_CACHED;
> > > > > + sched_engine->queue_priority_hint = INT_MIN;
> > > > > + sched_engine->queue = RB_ROOT_CACHED;
> > > > >
> > > > > spin_unlock_irqrestore(&engine->active.lock, flags);
> > > > > }
> > > > > @@ -540,7 +541,7 @@ static void guc_submit_request(struct i915_request *rq)
> > > > >
> > > > > queue_request(engine, rq, rq_prio(rq));
> > > > >
> > > > > - GEM_BUG_ON(RB_EMPTY_ROOT(&engine->execlists.queue.rb_root));
> > > > > + GEM_BUG_ON(RB_EMPTY_ROOT(&engine->sched_engine->queue.rb_root));
> > > > > GEM_BUG_ON(list_empty(&rq->sched.link));
> > > > >
> > > > > tasklet_hi_schedule(&engine->execlists.tasklet);
> > > > > diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
> > > > > index efa638c3acc7..4953874a9ba6 100644
> > > > > --- a/drivers/gpu/drm/i915/i915_scheduler.c
> > > > > +++ b/drivers/gpu/drm/i915/i915_scheduler.c
> > > > > @@ -40,7 +40,7 @@ static inline struct i915_priolist *to_priolist(struct rb_node *rb)
> > > > > return rb_entry(rb, struct i915_priolist, node);
> > > > > }
> > > > >
> > > > > -static void assert_priolists(struct intel_engine_execlists * const execlists)
> > > > > +static void assert_priolists(struct i915_sched_engine * const sched_engine)
> > > > > {
> > > > > struct rb_node *rb;
> > > > > long last_prio;
> > > > > @@ -48,11 +48,11 @@ static void assert_priolists(struct intel_engine_execlists * const execlists)
> > > > > if (!IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
> > > > > return;
> > > > >
> > > > > - GEM_BUG_ON(rb_first_cached(&execlists->queue) !=
> > > > > - rb_first(&execlists->queue.rb_root));
> > > > > + GEM_BUG_ON(rb_first_cached(&sched_engine->queue) !=
> > > > > + rb_first(&sched_engine->queue.rb_root));
> > > > >
> > > > > last_prio = INT_MAX;
> > > > > - for (rb = rb_first_cached(&execlists->queue); rb; rb = rb_next(rb)) {
> > > > > + for (rb = rb_first_cached(&sched_engine->queue); rb; rb = rb_next(rb)) {
> > > > > const struct i915_priolist *p = to_priolist(rb);
> > > > >
> > > > > GEM_BUG_ON(p->priority > last_prio);
> > > > > @@ -63,21 +63,21 @@ static void assert_priolists(struct intel_engine_execlists * const execlists)
> > > > > struct list_head *
> > > > > i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio)
> > > > > {
> > > > > - struct intel_engine_execlists * const execlists = &engine->execlists;
> > > > > + struct i915_sched_engine * const sched_engine = engine->sched_engine;
> > > > > struct i915_priolist *p;
> > > > > struct rb_node **parent, *rb;
> > > > > bool first = true;
> > > > >
> > > > > lockdep_assert_held(&engine->active.lock);
> > > > > - assert_priolists(execlists);
> > > > > + assert_priolists(sched_engine);
> > > > >
> > > > > - if (unlikely(execlists->no_priolist))
> > > > > + if (unlikely(sched_engine->no_priolist))
> > > > > prio = I915_PRIORITY_NORMAL;
> > > > >
> > > > > find_priolist:
> > > > > /* most positive priority is scheduled first, equal priorities fifo */
> > > > > rb = NULL;
> > > > > - parent = &execlists->queue.rb_root.rb_node;
> > > > > + parent = &sched_engine->queue.rb_root.rb_node;
> > > > > while (*parent) {
> > > > > rb = *parent;
> > > > > p = to_priolist(rb);
> > > > > @@ -92,7 +92,7 @@ i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio)
> > > > > }
> > > > >
> > > > > if (prio == I915_PRIORITY_NORMAL) {
> > > > > - p = &execlists->default_priolist;
> > > > > + p = &sched_engine->default_priolist;
> > > > > } else {
> > > > > p = kmem_cache_alloc(global.slab_priorities, GFP_ATOMIC);
> > > > > /* Convert an allocation failure to a priority bump */
> > > > > @@ -107,7 +107,7 @@ i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio)
> > > > > * requests, so if userspace lied about their
> > > > > * dependencies that reordering may be visible.
> > > > > */
> > > > > - execlists->no_priolist = true;
> > > > > + sched_engine->no_priolist = true;
> > > > > goto find_priolist;
> > > > > }
> > > > > }
> > > > > @@ -116,7 +116,7 @@ i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio)
> > > > > INIT_LIST_HEAD(&p->requests);
> > > > >
> > > > > rb_link_node(&p->node, rb, parent);
> > > > > - rb_insert_color_cached(&p->node, &execlists->queue, first);
> > > > > + rb_insert_color_cached(&p->node, &sched_engine->queue, first);
> > > > >
> > > > > return &p->requests;
> > > > > }
> > > > > @@ -184,7 +184,7 @@ static void kick_submission(struct intel_engine_cs *engine,
> > > > > * We only need to kick the tasklet once for the high priority
> > > > > * new context we add into the queue.
> > > > > */
> > > > > - if (prio <= engine->execlists.queue_priority_hint)
> > > > > + if (prio <= engine->sched_engine->queue_priority_hint)
> > > > > return;
> > > > >
> > > > > rcu_read_lock();
> > > > > @@ -208,7 +208,7 @@ static void kick_submission(struct intel_engine_cs *engine,
> > > > > inflight->fence.context, inflight->fence.seqno,
> > > > > inflight->sched.attr.priority);
> > > > >
> > > > > - engine->execlists.queue_priority_hint = prio;
> > > > > + engine->sched_engine->queue_priority_hint = prio;
> > > > > if (need_preempt(prio, rq_prio(inflight)))
> > > > > tasklet_hi_schedule(&engine->execlists.tasklet);
> > > > >
> > > > > @@ -489,6 +489,31 @@ void i915_request_show_with_schedule(struct drm_printer *m,
> > > > > rcu_read_unlock();
> > > > > }
> > > > >
> > > > > +void i915_sched_engine_free(struct kref *kref)
> > > > > +{
> > > > > + struct i915_sched_engine *sched_engine =
> > > > > + container_of(kref, typeof(*sched_engine), ref);
> > > > > +
> > > > > + kfree(sched_engine);
> > > > > +}
> > > > > +
> > > > > +struct i915_sched_engine *
> > > > > +i915_sched_engine_create(unsigned int subclass)
> > > > > +{
> > > > > + struct i915_sched_engine *sched_engine;
> > > > > +
> > > > > + sched_engine = kzalloc(sizeof(*sched_engine), GFP_KERNEL);
> > > > > + if (!sched_engine)
> > > > > + return NULL;
> > > > > +
> > > > > + kref_init(&sched_engine->ref);
> > > > > +
> > > > > + sched_engine->queue = RB_ROOT_CACHED;
> > > > > + sched_engine->queue_priority_hint = INT_MIN;
> > > > > +
> > > > > + return sched_engine;
> > > > > +}
> > > > > +
> > > > > static void i915_global_scheduler_shrink(void)
> > > > > {
> > > > > kmem_cache_shrink(global.slab_dependencies);
> > > > > diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
> > > > > index 858a0938f47a..91a04e34cac5 100644
> > > > > --- a/drivers/gpu/drm/i915/i915_scheduler.h
> > > > > +++ b/drivers/gpu/drm/i915/i915_scheduler.h
> > > > > @@ -48,6 +48,24 @@ static inline void i915_priolist_free(struct i915_priolist *p)
> > > > > __i915_priolist_free(p);
> > > > > }
> > > > >
> > > > > +struct i915_sched_engine *
> > > > > +i915_sched_engine_create(unsigned int subclass);
> > > > > +
> > > > > +void i915_sched_engine_free(struct kref *kref);
> > > > > +
> > > > > +static inline struct i915_sched_engine *
> > > > > +i915_sched_engine_get(struct i915_sched_engine *sched_engine)
> > > > > +{
> > > > > + kref_get(&sched_engine->ref);
> > > > > + return sched_engine;
> > > > > +}
> > > > > +
> > > > > +static inline void
> > > > > +i915_sched_engine_put(struct i915_sched_engine *sched_engine)
> > > > > +{
> > > > > + kref_put(&sched_engine->ref, i915_sched_engine_free);
> > > > > +}
> > > > > +
> > > > > void i915_request_show_with_schedule(struct drm_printer *m,
> > > > > const struct i915_request *rq,
> > > > > const char *prefix,
> > > > > diff --git a/drivers/gpu/drm/i915/i915_scheduler_types.h b/drivers/gpu/drm/i915/i915_scheduler_types.h
> > > > > index 343ed44d5ed4..16a054e67760 100644
> > > > > --- a/drivers/gpu/drm/i915/i915_scheduler_types.h
> > > > > +++ b/drivers/gpu/drm/i915/i915_scheduler_types.h
> > > >
> > > > Dumb question for which I'm not really in the position of having an
> > > > opinion: Should this go in its own file?
> > > >
> > >
> > > I think this is in the right file.
> > >
> > > Matt
> > >
> > > > Patch seems mostly mechanically correct. Not sure where this is going
> > > > yet, though. I'll keep reading. :-)
> > > >
> > > > --Jason
> > > >
> > > >
> > > > > @@ -91,4 +91,37 @@ struct i915_dependency {
> > > > > &(rq__)->sched.signalers_list, \
> > > > > signal_link)
> > > > >
> > > > > +struct i915_sched_engine {
> > > > > + struct kref ref;
> > > > > +
> > > > > + /**
> > > > > + * @default_priolist: priority list for I915_PRIORITY_NORMAL
> > > > > + */
> > > > > + struct i915_priolist default_priolist;
> > > > > +
> > > > > + /**
> > > > > + * @queue_priority_hint: Highest pending priority.
> > > > > + *
> > > > > + * When we add requests into the queue, or adjust the priority of
> > > > > + * executing requests, we compute the maximum priority of those
> > > > > + * pending requests. We can then use this value to determine if
> > > > > + * we need to preempt the executing requests to service the queue.
> > > > > + * However, since the we may have recorded the priority of an inflight
> > > > > + * request we wanted to preempt but since completed, at the time of
> > > > > + * dequeuing the priority hint may no longer may match the highest
> > > > > + * available request priority.
> > > > > + */
> > > > > + int queue_priority_hint;
> > > > > +
> > > > > + /**
> > > > > + * @queue: queue of requests, in priority lists
> > > > > + */
> > > > > + struct rb_root_cached queue;
> > > > > +
> > > > > + /**
> > > > > + * @no_priolist: priority lists disabled
> > > > > + */
> > > > > + bool no_priolist;
> > > > > +};
> > > > > +
> > > > > #endif /* _I915_SCHEDULER_TYPES_H_ */
> > > > > --
> > > > > 2.28.0
> > > > >
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