Quoting Tvrtko Ursulin (2018-02-14 18:50:31)
> +ktime_t intel_context_engine_get_busy_time(struct i915_gem_context *ctx,
> +                                          struct intel_engine_cs *engine)
> +{
> +       struct intel_context *ce = &ctx->engine[engine->id];
> +       ktime_t total;
> +
> +       spin_lock_irq(&ce->stats.lock);
> +
> +       total = ce->stats.total;
> +
> +       if (ce->stats.active)
> +               total = ktime_add(total,
> +                                 ktime_sub(ktime_get(), ce->stats.start));
> +
> +       spin_unlock_irq(&ce->stats.lock);

Looks like we can just use a seqlock here.
-Chris
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