[Intel-gfx] [PATCH v6 08/11] drm/i915: add a new perf configuration execbuf parameter

[Chris Wilson]

Quoting Lionel Landwerlin (2019-07-01 12:34:34)
> +static int eb_oa_config(struct i915_execbuffer *eb)
> +{
> +       int err;
> +
> +       if (!eb->oa_config)
> +               return 0;
> +
> +       err = i915_active_request_set(&eb->engine->last_oa_config,
> +                                     eb->request);
> +       if (err)
> +               return err;
> +
> +       /*
> +        * If the config hasn't changed, skip reconfiguring the HW (this is
> +        * subject to a delay we want to avoid has much as possible).
> +        */
> +       if (eb->oa_config == eb->i915->perf.oa.exclusive_stream->oa_config)
> +               return 0;

So what's the story for resets? I presume the OA config is lost on a
device reset, and possible an engine reset? If so, then if we reset, we
lose the config and do not notice.
-Chris