drm/i915/execlists: Always clear ring_pause if we do not submit
In the unlikely case (thank you CI!), we may find ourselves wanting to issue a preemption but having no runnable requests left. In this case, we set the semaphore before computing the preemption and so must unset it before forgetting (or else we leave the machine busywaiting until the next request comes along and so likely hang). v2: Replace readback with only a wmb after asserting the semaphore Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190624092009.30189-1-chris@chris-wilson.co.ukalistair/sunxi64-5.4-dsi
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b2dbf8d982
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8db7933ee3
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@ -240,7 +240,8 @@ ring_set_paused(const struct intel_engine_cs *engine, int state)
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* until the dword is false.
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*/
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engine->status_page.addr[I915_GEM_HWS_PREEMPT] = state;
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wmb();
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if (state)
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wmb();
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}
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static inline struct i915_priolist *to_priolist(struct rb_node *rb)
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@ -1243,6 +1244,8 @@ done:
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*port = execlists_schedule_in(last, port - execlists->pending);
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memset(port + 1, 0, (last_port - port) * sizeof(*port));
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execlists_submit_ports(engine);
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} else {
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ring_set_paused(engine, 0);
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}
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}
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