On Thu, Jun 3, 2021 at 4:09 PM Matthew Brost <matthew.brost@xxxxxxxxx> 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@xxxxxxxxx>
> ---
> 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"?
> */
> - 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?
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
>
