drm/i915/perf: pass stream to vfuncs when possible

We want to use some of the properties of the perf stream to program
the hardware in a later commit.

v2: Pass only perf stream as argument (Matthew)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181023100707.31738-4-lionel.g.landwerlin@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -1528,8 +1528,7 @@ struct i915_oa_ops {
 	 * counter reports being sampled. May apply system constraints such as
 	 * disabling EU clock gating as required.
 	 */
-	int (*enable_metric_set)(struct drm_i915_private *dev_priv,
-				 const struct i915_oa_config *oa_config);
+	int (*enable_metric_set)(struct i915_perf_stream *stream);
 
 	/**
 	 * @disable_metric_set: Remove system constraints associated with using
@@ -1540,12 +1539,12 @@ struct i915_oa_ops {
 	/**
 	 * @oa_enable: Enable periodic sampling
 	 */
-	void (*oa_enable)(struct drm_i915_private *dev_priv);
+	void (*oa_enable)(struct i915_perf_stream *stream);
 
 	/**
 	 * @oa_disable: Disable periodic sampling
 	 */
-	void (*oa_disable)(struct drm_i915_private *dev_priv);
+	void (*oa_disable)(struct i915_perf_stream *stream);
 
 	/**
 	 * @read: Copy data from the circular OA buffer into a given userspace