[Intel-gfx] [PATCH 9/9] drm/i915/doc: Add kernel doc for i915_sched_engine

[Matthew Brost <matthew.brost@intel.com>]

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 Documentation/gpu/i915.rst                  |  6 ++++
 drivers/gpu/drm/i915/i915_scheduler_types.h | 37 ++++++++++++++++++---
 2 files changed, 38 insertions(+), 5 deletions(-)

diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst
index 42ce0196930a..8f4f5471a05b 100644
--- a/Documentation/gpu/i915.rst
+++ b/Documentation/gpu/i915.rst
@@ -425,6 +425,12 @@ User Batchbuffer Execution
 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
    :doc: User command execution
 
+Scheduling
+----------
+.. kernel-doc:: drivers/gpu/drm/i915/i915_scheduler_types.h
+   :functions: i915_sched_engine
+
+
 Logical Rings, Logical Ring Contexts and Execlists
 --------------------------------------------------
 
diff --git a/drivers/gpu/drm/i915/i915_scheduler_types.h b/drivers/gpu/drm/i915/i915_scheduler_types.h
index 9d79514450de..e3da7517853f 100644
--- a/drivers/gpu/drm/i915/i915_scheduler_types.h
+++ b/drivers/gpu/drm/i915/i915_scheduler_types.h
@@ -91,7 +91,21 @@ struct i915_dependency {
 				&(rq__)->sched.signalers_list, \
 				signal_link)
 
+/**
+ * sturct i915_sched_engine - scheduler engine
+ *
+ * A schedule engine represents a submission queue with different priority
+ * bands. It contains all the common state (relative to the backend) to queue,
+ * track, and submit a request.
+ *
+ * This object at the moment is quite i915 specific but will transition into a
+ * container for the drm_gpu_scheduler plus a few other variables once the i915
+ * is integrated with the DRM scheduler.
+ */
 struct i915_sched_engine {
+	/**
+	 * @ref: reference count of schedule engine object
+	 */
 	struct kref ref;
 
 	/**
@@ -100,11 +114,18 @@ struct i915_sched_engine {
 	 */
 	spinlock_t lock;
 
+	/**
+	 * @requests: list of requests inflight on this schedule engine
+	 */
 	struct list_head requests;
-	struct list_head hold; /* ready requests, but on hold */
 
 	/**
-	 * @tasklet: softirq tasklet for bottom handler
+	 * @hold: list of requests on hold.
+	 */
+	struct list_head hold;
+
+	/**
+	 * @tasklet: softirq tasklet for submission
 	 */
 	struct tasklet_struct tasklet;
 
@@ -137,14 +158,20 @@ struct i915_sched_engine {
 	 */
 	bool no_priolist;
 
-	/* Back pointer to engine */
+	/**
+	 * @engine: back pointer to engine
+	 */
 	struct intel_engine_cs *engine;
 
-	/* Kick backend */
+	/**
+	 * @kick_backed: kick back after a request's priority has changed
+	 */
 	void	(*kick_backend)(const struct i915_request *rq,
 				int prio);
 
-	/*
+	/**
+	 * @schedule: schedule function to adjust priority of request
+	 *
 	 * Call when the priority on a request has changed and it and its
 	 * dependencies may need rescheduling. Note the request itself may
 	 * not be ready to run!
-- 
2.28.0

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