drm/i915: Add gem/i915_gem_context.h to the docs

In order to prevent kernel doc warnings, also fill out docs for any
missing fields and fix those that forgot the "@".

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210708154835.528166-16-jason@jlekstrand.net

Documentation/gpu/i915.rst

@@ -422,6 +422,8 @@ Batchbuffer Parsing
 User Batchbuffer Execution
 --------------------------
 
+.. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+
 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
    :doc: User command execution
 

drivers/gpu/drm/i915/gem/i915_gem_context_types.h

@@ -30,19 +30,39 @@ struct i915_address_space;
 struct intel_timeline;
 struct intel_ring;
 
+/**
+ * struct i915_gem_engines - A set of engines
+ */
 struct i915_gem_engines {
 	union {
+		/** @link: Link in i915_gem_context::stale::engines */
 		struct list_head link;
+
+		/** @rcu: RCU to use when freeing */
 		struct rcu_head rcu;
 	};
+
+	/** @fence: Fence used for delayed destruction of engines */
 	struct i915_sw_fence fence;
+
+	/** @ctx: i915_gem_context backpointer */
 	struct i915_gem_context *ctx;
+
+	/** @num_engines: Number of engines in this set */
 	unsigned int num_engines;
+
+	/** @engines: Array of engines */
 	struct intel_context *engines[];
 };
 
+/**
+ * struct i915_gem_engines_iter - Iterator for an i915_gem_engines set
+ */
 struct i915_gem_engines_iter {
+	/** @idx: Index into i915_gem_engines::engines */
 	unsigned int idx;
+
+	/** @engines: Engine set being iterated */
 	const struct i915_gem_engines *engines;
 };
 
@@ -53,10 +73,10 @@ struct i915_gem_engines_iter {
  * logical hardware state for a particular client.
  */
 struct i915_gem_context {
-	/** i915: i915 device backpointer */
+	/** @i915: i915 device backpointer */
 	struct drm_i915_private *i915;
 
-	/** file_priv: owning file descriptor */
+	/** @file_priv: owning file descriptor */
 	struct drm_i915_file_private *file_priv;
 
 	/**
@@ -81,7 +101,9 @@ struct i915_gem_context {
 	 * CONTEXT_USER_ENGINES flag is set).
 	 */
 	struct i915_gem_engines __rcu *engines;
-	struct mutex engines_mutex; /* guards writes to engines */
+
+	/** @engines_mutex: guards writes to engines */
+	struct mutex engines_mutex;
 
 	/**
 	 * @syncobj: Shared timeline syncobj
@@ -118,7 +140,7 @@ struct i915_gem_context {
 	 */
 	struct pid *pid;
 
-	/** link: place with &drm_i915_private.context_list */
+	/** @link: place with &drm_i915_private.context_list */
 	struct list_head link;
 
 	/**
@@ -153,11 +175,13 @@ struct i915_gem_context {
 #define CONTEXT_CLOSED			0
 #define CONTEXT_USER_ENGINES		1
 
+	/** @mutex: guards everything that isn't engines or handles_vma */
 	struct mutex mutex;
 
+	/** @sched: scheduler parameters */
 	struct i915_sched_attr sched;
 
-	/** guilty_count: How many times this context has caused a GPU hang. */
+	/** @guilty_count: How many times this context has caused a GPU hang. */
 	atomic_t guilty_count;
 	/**
 	 * @active_count: How many times this context was active during a GPU
@@ -171,15 +195,17 @@ struct i915_gem_context {
 	unsigned long hang_timestamp[2];
 #define CONTEXT_FAST_HANG_JIFFIES (120 * HZ) /* 3 hangs within 120s? Banned! */
 
-	/** remap_slice: Bitmask of cache lines that need remapping */
+	/** @remap_slice: Bitmask of cache lines that need remapping */
 	u8 remap_slice;
 
 	/**
-	 * handles_vma: rbtree to look up our context specific obj/vma for
+	 * @handles_vma: rbtree to look up our context specific obj/vma for
 	 * the user handle. (user handles are per fd, but the binding is
 	 * per vm, which may be one per context or shared with the global GTT)
 	 */
 	struct radix_tree_root handles_vma;
+
+	/** @lut_mutex: Locks handles_vma */
 	struct mutex lut_mutex;
 
 	/**
@@ -191,8 +217,11 @@ struct i915_gem_context {
 	 */
 	char name[TASK_COMM_LEN + 8];
 
+	/** @stale: tracks stale engines to be destroyed */
 	struct {
+		/** @lock: guards engines */
 		spinlock_t lock;
+		/** @engines: list of stale engines */
 		struct list_head engines;
 	} stale;
 };