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
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