pt->priority = INT_MIN;
}
+static void unreserve_seqno(struct intel_engine_cs *engine)
+{
+ GEM_BUG_ON(!engine->timeline->inflight_seqnos);
+ engine->timeline->inflight_seqnos--;
+}
+
void i915_gem_retire_noop(struct i915_gem_active *active,
struct drm_i915_gem_request *request)
{
&request->i915->gt.idle_work,
msecs_to_jiffies(100));
}
+ unreserve_seqno(request->engine);
/* Walk through the active list, calling retire on each. This allows
* objects to track their GPU activity and mark themselves as idle
} while (tmp != req);
}
-static int i915_gem_init_global_seqno(struct drm_i915_private *i915, u32 seqno)
+static int reset_all_global_seqno(struct drm_i915_private *i915, u32 seqno)
{
struct i915_gem_timeline *timeline = &i915->gt.global_timeline;
struct intel_engine_cs *engine;
GEM_BUG_ON(i915->gt.active_requests > 1);
/* If the seqno wraps around, we need to clear the breadcrumb rbtree */
- if (!i915_seqno_passed(seqno, atomic_read(&timeline->seqno))) {
- while (intel_breadcrumbs_busy(i915))
- cond_resched(); /* spin until threads are complete */
- }
- atomic_set(&timeline->seqno, seqno);
+ for_each_engine(engine, i915, id) {
+ struct intel_timeline *tl = &timeline->engine[id];
- /* Finally reset hw state */
- for_each_engine(engine, i915, id)
+ if (!i915_seqno_passed(seqno, tl->seqno)) {
+ /* spin until threads are complete */
+ while (intel_breadcrumbs_busy(engine))
+ cond_resched();
+ }
+
+ /* Finally reset hw state */
+ tl->seqno = seqno;
intel_engine_init_global_seqno(engine, seqno);
+ }
list_for_each_entry(timeline, &i915->gt.timelines, link) {
for_each_engine(engine, i915, id) {
/* HWS page needs to be set less than what we
* will inject to ring
*/
- return i915_gem_init_global_seqno(dev_priv, seqno - 1);
+ return reset_all_global_seqno(dev_priv, seqno - 1);
}
-static int reserve_global_seqno(struct drm_i915_private *i915)
+static int reserve_seqno(struct intel_engine_cs *engine)
{
- u32 active_requests = ++i915->gt.active_requests;
- u32 seqno = atomic_read(&i915->gt.global_timeline.seqno);
+ u32 active = ++engine->timeline->inflight_seqnos;
+ u32 seqno = engine->timeline->seqno;
int ret;
/* Reservation is fine until we need to wrap around */
- if (likely(seqno + active_requests > seqno))
+ if (likely(!add_overflows(seqno, active)))
return 0;
- ret = i915_gem_init_global_seqno(i915, 0);
+ /* Even though we are tracking inflight seqno individually on each
+ * engine, other engines may be observing us using hw semaphores and
+ * so we need to idle all engines before wrapping around this engine.
+ * As all engines are then idle, we can reset the seqno on all, so
+ * we don't stall in quick succession if each engine is being
+ * similarly utilized.
+ */
+ ret = reset_all_global_seqno(engine->i915, 0);
if (ret) {
- i915->gt.active_requests--;
+ engine->timeline->inflight_seqnos--;
return ret;
}
return 0;
}
-static u32 __timeline_get_seqno(struct i915_gem_timeline *tl)
-{
- /* seqno only incremented under a mutex */
- return ++tl->seqno.counter;
-}
-
-static u32 timeline_get_seqno(struct i915_gem_timeline *tl)
+static u32 timeline_get_seqno(struct intel_timeline *tl)
{
- return atomic_inc_return(&tl->seqno);
+ return ++tl->seqno;
}
void __i915_gem_request_submit(struct drm_i915_gem_request *request)
GEM_BUG_ON(timeline == request->timeline);
assert_spin_locked(&timeline->lock);
- seqno = timeline_get_seqno(timeline->common);
+ seqno = timeline_get_seqno(timeline);
GEM_BUG_ON(!seqno);
GEM_BUG_ON(i915_seqno_passed(intel_engine_get_seqno(engine), seqno));
- GEM_BUG_ON(i915_seqno_passed(timeline->last_submitted_seqno, seqno));
- request->previous_seqno = timeline->last_submitted_seqno;
- timeline->last_submitted_seqno = seqno;
-
/* We may be recursing from the signal callback of another i915 fence */
spin_lock_nested(&request->lock, SINGLE_DEPTH_NESTING);
request->global_seqno = seqno;
if (ret)
return ERR_PTR(ret);
- ret = reserve_global_seqno(dev_priv);
+ ret = reserve_seqno(engine);
if (ret)
goto err_unpin;
&i915_fence_ops,
&req->lock,
req->timeline->fence_context,
- __timeline_get_seqno(req->timeline->common));
+ timeline_get_seqno(req->timeline));
/* We bump the ref for the fence chain */
i915_sw_fence_init(&i915_gem_request_get(req)->submit, submit_notify);
*/
req->head = req->ring->tail;
+ /* Check that we didn't interrupt ourselves with a new request */
+ GEM_BUG_ON(req->timeline->seqno != req->fence.seqno);
return req;
err_ctx:
kmem_cache_free(dev_priv->requests, req);
err_unreserve:
- dev_priv->gt.active_requests--;
+ unreserve_seqno(engine);
err_unpin:
engine->context_unpin(engine, ctx);
return ERR_PTR(ret);
* our i915_gem_request_alloc() and called __i915_add_request() before
* us, the timeline will hold its seqno which is later than ours.
*/
- GEM_BUG_ON(i915_seqno_passed(timeline->last_submitted_seqno,
- request->fence.seqno));
+ GEM_BUG_ON(timeline->seqno != request->fence.seqno);
/*
* To ensure that this call will not fail, space for its emissions
list_add_tail(&request->link, &timeline->requests);
spin_unlock_irq(&timeline->lock);
- GEM_BUG_ON(i915_seqno_passed(timeline->last_submitted_seqno,
- request->fence.seqno));
-
- timeline->last_submitted_seqno = request->fence.seqno;
+ GEM_BUG_ON(timeline->seqno != request->fence.seqno);
i915_gem_active_set(&timeline->last_request, request);
list_add_tail(&request->ring_link, &ring->request_list);
request->emitted_jiffies = jiffies;
- i915_gem_mark_busy(engine);
+ if (!request->i915->gt.active_requests++)
+ i915_gem_mark_busy(engine);
/* Let the backend know a new request has arrived that may need
* to adjust the existing execution schedule due to a high priority
projects / linux.git / commitdiff