[Intel-gfx] [RFC 08/12] drm/i915: Expose per-engine client busyness

[Chris Wilson]

Quoting Tvrtko Ursulin (2020-03-09 18:31:25)
> +static ssize_t
> +show_client_busy(struct device *kdev, struct device_attribute *attr, char *buf)
> +{
> +       struct i915_engine_busy_attribute *i915_attr =
> +               container_of(attr, typeof(*i915_attr), attr);
> +       unsigned int class = i915_attr->engine_class;
> +       struct i915_drm_client *client = i915_attr->client;
> +       u64 total = atomic64_read(&client->past_runtime[class]);
> +       struct list_head *list = &client->ctx_list;
> +       struct i915_gem_context *ctx;
> +
> +       rcu_read_lock();
> +       list_for_each_entry_rcu(ctx, list, client_link) {
> +               total += atomic64_read(&ctx->past_runtime[class]);
> +               total += pphwsp_busy_add(ctx, class);
> +       }
> +       rcu_read_unlock();
> +
> +       total *= RUNTIME_INFO(i915_attr->i915)->cs_timestamp_period_ns;

Planning early retirement? In 600 years, they'll have forgotten how to
email ;)
-Chris