status, rq);
}
+static inline struct intel_engine_cs *
+__execlists_schedule_in(struct i915_request *rq)
+{
+ struct intel_engine_cs * const engine = rq->engine;
+ struct intel_context * const ce = rq->hw_context;
+
+ intel_context_get(ce);
+
+ intel_gt_pm_get(engine->gt);
+ execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_IN);
+ intel_engine_context_in(engine);
+
+ return engine;
+}
+
static inline struct i915_request *
execlists_schedule_in(struct i915_request *rq, int idx)
{
- struct intel_context *ce = rq->hw_context;
- int count;
+ struct intel_context * const ce = rq->hw_context;
+ struct intel_engine_cs *old;
+ GEM_BUG_ON(!intel_engine_pm_is_awake(rq->engine));
trace_i915_request_in(rq, idx);
- count = intel_context_inflight_count(ce);
- if (!count) {
- intel_context_get(ce);
- ce->inflight = rq->engine;
-
- intel_gt_pm_get(ce->inflight->gt);
- execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_IN);
- intel_engine_context_in(ce->inflight);
- }
+ old = READ_ONCE(ce->inflight);
+ do {
+ if (!old) {
+ WRITE_ONCE(ce->inflight, __execlists_schedule_in(rq));
+ break;
+ }
+ } while (!try_cmpxchg(&ce->inflight, &old, ptr_inc(old)));
- intel_context_inflight_inc(ce);
GEM_BUG_ON(intel_context_inflight(ce) != rq->engine);
-
return i915_request_get(rq);
}
}
static inline void
-execlists_schedule_out(struct i915_request *rq)
+__execlists_schedule_out(struct i915_request *rq,
+ struct intel_engine_cs * const engine)
{
- struct intel_context *ce = rq->hw_context;
+ struct intel_context * const ce = rq->hw_context;
- GEM_BUG_ON(!intel_context_inflight_count(ce));
+ intel_engine_context_out(engine);
+ execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_OUT);
+ intel_gt_pm_put(engine->gt);
- trace_i915_request_out(rq);
+ /*
+ * If this is part of a virtual engine, its next request may
+ * have been blocked waiting for access to the active context.
+ * We have to kick all the siblings again in case we need to
+ * switch (e.g. the next request is not runnable on this
+ * engine). Hopefully, we will already have submitted the next
+ * request before the tasklet runs and do not need to rebuild
+ * each virtual tree and kick everyone again.
+ */
+ if (ce->engine != engine)
+ kick_siblings(rq, ce);
- intel_context_inflight_dec(ce);
- if (!intel_context_inflight_count(ce)) {
- intel_engine_context_out(ce->inflight);
- execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_OUT);
- intel_gt_pm_put(ce->inflight->gt);
+ intel_context_put(ce);
+}
- /*
- * If this is part of a virtual engine, its next request may
- * have been blocked waiting for access to the active context.
- * We have to kick all the siblings again in case we need to
- * switch (e.g. the next request is not runnable on this
- * engine). Hopefully, we will already have submitted the next
- * request before the tasklet runs and do not need to rebuild
- * each virtual tree and kick everyone again.
- */
- ce->inflight = NULL;
- if (rq->engine != ce->engine)
- kick_siblings(rq, ce);
+static inline void
+execlists_schedule_out(struct i915_request *rq)
+{
+ struct intel_context * const ce = rq->hw_context;
+ struct intel_engine_cs *cur, *old;
- intel_context_put(ce);
- }
+ trace_i915_request_out(rq);
+ GEM_BUG_ON(intel_context_inflight(ce) != rq->engine);
+
+ old = READ_ONCE(ce->inflight);
+ do
+ cur = ptr_unmask_bits(old, 2) ? ptr_dec(old) : NULL;
+ while (!try_cmpxchg(&ce->inflight, &old, cur));
+ if (!cur)
+ __execlists_schedule_out(rq, old);
i915_request_put(rq);
}
trace_ports(execlists, msg, execlists->pending);
+ if (!execlists->pending[0])
+ return false;
+
if (execlists->pending[execlists_num_ports(execlists)])
return false;
return hint >= effective_prio(rq);
}
+static int
+switch_prio(struct intel_engine_cs *engine, const struct i915_request *rq)
+{
+ if (list_is_last(&rq->sched.link, &engine->active.requests))
+ return INT_MIN;
+
+ return rq_prio(list_next_entry(rq, sched.link));
+}
+
static bool
-enable_timeslice(struct intel_engine_cs *engine)
+enable_timeslice(const struct intel_engine_execlists *execlists)
{
- struct i915_request *last = last_active(&engine->execlists);
+ const struct i915_request *rq = *execlists->active;
- return last && need_timeslice(engine, last);
+ if (i915_request_completed(rq))
+ return false;
+
+ return execlists->switch_priority_hint >= effective_prio(rq);
}
static void record_preemption(struct intel_engine_execlists *execlists)
*port = execlists_schedule_in(last, port - execlists->pending);
memset(port + 1, 0, (last_port - port) * sizeof(*port));
execlists_submit_ports(engine);
+ execlists->switch_priority_hint =
+ switch_prio(engine, *execlists->pending);
} else {
ring_set_paused(engine, 0);
}
const u8 num_entries = execlists->csb_size;
u8 head, tail;
- lockdep_assert_held(&engine->active.lock);
GEM_BUG_ON(USES_GUC_SUBMISSION(engine->i915));
/*
execlists->pending,
execlists_num_ports(execlists) *
sizeof(*execlists->pending));
- execlists->pending[0] = NULL;
- trace_ports(execlists, "promoted", execlists->active);
-
- if (enable_timeslice(engine))
+ if (enable_timeslice(execlists))
mod_timer(&execlists->timer, jiffies + 1);
if (!inject_preempt_hang(execlists))
ring_set_paused(engine, 0);
+
+ WRITE_ONCE(execlists->pending[0], NULL);
break;
case CSB_COMPLETE: /* port0 completed, advanced to port1 */
static void __execlists_submission_tasklet(struct intel_engine_cs *const engine)
{
lockdep_assert_held(&engine->active.lock);
-
- process_csb(engine);
if (!engine->execlists.pending[0])
execlists_dequeue(engine);
}
struct intel_engine_cs * const engine = (struct intel_engine_cs *)data;
unsigned long flags;
- spin_lock_irqsave(&engine->active.lock, flags);
- __execlists_submission_tasklet(engine);
- spin_unlock_irqrestore(&engine->active.lock, flags);
+ process_csb(engine);
+ if (!READ_ONCE(engine->execlists.pending[0])) {
+ spin_lock_irqsave(&engine->active.lock, flags);
+ __execlists_submission_tasklet(engine);
+ spin_unlock_irqrestore(&engine->active.lock, flags);
+ }
}
static void execlists_submission_timer(struct timer_list *timer)
projects / linux-2.6-microblaze.git / commitdiff