In order to avoid preempting ourselves, we currently refuse to schedule
the tasklet if we reschedule an inflight context. However, this glosses
over a few issues such as what happens after a CS completion event and
we then preempt the newly executing context with itself, or if something
else causes a tasklet_schedule triggering the same evaluation to
preempt the active context with itself.
To avoid the extra complications, after deciding that we have
potentially queued a request with higher priority than the currently
executing request, inspect the head of the queue to see if it is indeed
higher priority from another context.
References: a2bf92e8cc16 ("drm/i915/execlists: Avoid kicking priority on the current context")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_scheduler.c | 20 ++++++++++++++----
drivers/gpu/drm/i915/intel_lrc.c | 29 ++++++++++++++++++++++++++-
2 files changed, 44 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index 340faea6c08a..fb5d953430e5 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -239,6 +239,18 @@ sched_lock_engine(struct i915_sched_node *node, struct intel_engine_cs *locked)
return engine;
}
+static bool inflight(const struct i915_request *rq,
+ const struct intel_engine_cs *engine)
+{
+ const struct i915_request *active;
+
+ if (!rq->global_seqno)
+ return false;
+
+ active = port_request(engine->execlists.port);
+ return active->hw_context == rq->hw_context;
+}
+
static void __i915_schedule(struct i915_request *rq,
const struct i915_sched_attr *attr)
{
@@ -328,6 +340,7 @@ static void __i915_schedule(struct i915_request *rq,
INIT_LIST_HEAD(&dep->dfs_link);
engine = sched_lock_engine(node, engine);
+ lockdep_assert_held(&engine->timeline.lock);
/* Recheck after acquiring the engine->timeline.lock */
if (prio <= node->attr.priority || node_signaled(node))
@@ -356,17 +369,16 @@ static void __i915_schedule(struct i915_request *rq,
if (prio <= engine->execlists.queue_priority)
continue;
+ engine->execlists.queue_priority = prio;
+
/*
* If we are already the currently executing context, don't
* bother evaluating if we should preempt ourselves.
*/
- if (node_to_request(node)->global_seqno &&
- i915_seqno_passed(port_request(engine->execlists.port)->global_seqno,
- node_to_request(node)->global_seqno))
+ if (inflight(node_to_request(node), engine))
continue;
/* Defer (tasklet) submission until after all of our updates. */
- engine->execlists.queue_priority = prio;
tasklet_hi_schedule(&engine->execlists.tasklet);
}
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index b74f25420683..28d183439952 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -190,6 +190,30 @@ static inline bool need_preempt(const struct intel_engine_cs *engine,
!i915_request_completed(last));
}
+static inline bool check_preempt(const struct intel_engine_cs *engine,
+ const struct i915_request *rq)
+{
+ const struct intel_context *ctx = rq->hw_context;
+ const int prio = rq_prio(rq);
+ struct rb_node *rb;
+ int idx;
+
+ list_for_each_entry_continue(rq, &engine->timeline.requests, link) {
+ GEM_BUG_ON(rq->hw_context == ctx);
+ if (rq_prio(rq) > prio)
+ return true;
+ }
+
+ rb = rb_first_cached(&engine->execlists.queue);
+ if (!rb)
+ return false;
+
+ priolist_for_each_request(rq, to_priolist(rb), idx)
+ return rq->hw_context != ctx && rq_prio(rq) > prio;
+
+ return false;
+}
+
/*
* The context descriptor encodes various attributes of a context,
* including its GTT address and some flags. Because it's fairly
@@ -580,7 +604,8 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
if (!execlists_is_active(execlists, EXECLISTS_ACTIVE_HWACK))
return;
- if (need_preempt(engine, last, execlists->queue_priority)) {
+ if (need_preempt(engine, last, execlists->queue_priority) &&
+ check_preempt(engine, last)) {
inject_preempt_context(engine);
return;
}
@@ -872,6 +897,8 @@ static void process_csb(struct intel_engine_cs *engine)
const u32 * const buf = execlists->csb_status;
u8 head, tail;
+ lockdep_assert_held(&engine->timeline.lock);
+
/*
* Note that csb_write, csb_status may be either in HWSP or mmio.
* When reading from the csb_write mmio register, we have to be
--
2.20.1
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