Initial import

1 files changed, 356 insertions, 0 deletions

diff --git a/drivers/staging/android/sync.h b/drivers/staging/android/sync.h
new file mode 100644
index 000000000..a21b79fb4
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+++ b/drivers/staging/android/sync.h
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+/*
+ * include/linux/sync.h
+ *
+ * Copyright (C) 2012 Google, Inc.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _LINUX_SYNC_H
+#define _LINUX_SYNC_H
+
+#include <linux/types.h>
+#include <linux/kref.h>
+#include <linux/ktime.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/fence.h>
+
+#include "uapi/sync.h"
+
+struct sync_timeline;
+struct sync_pt;
+struct sync_fence;
+
+/**
+ * struct sync_timeline_ops - sync object implementation ops
+ * @driver_name:	name of the implementation
+ * @dup:		duplicate a sync_pt
+ * @has_signaled:	returns:
+ *			  1 if pt has signaled
+ *			  0 if pt has not signaled
+ *			 <0 on error
+ * @compare:		returns:
+ *			  1 if b will signal before a
+ *			  0 if a and b will signal at the same time
+ *			 -1 if a will signal before b
+ * @free_pt:		called before sync_pt is freed
+ * @release_obj:	called before sync_timeline is freed
+ * @fill_driver_data:	write implementation specific driver data to data.
+ *			  should return an error if there is not enough room
+ *			  as specified by size.  This information is returned
+ *			  to userspace by SYNC_IOC_FENCE_INFO.
+ * @timeline_value_str: fill str with the value of the sync_timeline's counter
+ * @pt_value_str:	fill str with the value of the sync_pt
+ */
+struct sync_timeline_ops {
+	const char *driver_name;
+
+	/* required */
+	struct sync_pt * (*dup)(struct sync_pt *pt);
+
+	/* required */
+	int (*has_signaled)(struct sync_pt *pt);
+
+	/* required */
+	int (*compare)(struct sync_pt *a, struct sync_pt *b);
+
+	/* optional */
+	void (*free_pt)(struct sync_pt *sync_pt);
+
+	/* optional */
+	void (*release_obj)(struct sync_timeline *sync_timeline);
+
+	/* optional */
+	int (*fill_driver_data)(struct sync_pt *syncpt, void *data, int size);
+
+	/* optional */
+	void (*timeline_value_str)(struct sync_timeline *timeline, char *str,
+				   int size);
+
+	/* optional */
+	void (*pt_value_str)(struct sync_pt *pt, char *str, int size);
+};
+
+/**
+ * struct sync_timeline - sync object
+ * @kref:		reference count on fence.
+ * @ops:		ops that define the implementation of the sync_timeline
+ * @name:		name of the sync_timeline. Useful for debugging
+ * @destroyed:		set when sync_timeline is destroyed
+ * @child_list_head:	list of children sync_pts for this sync_timeline
+ * @child_list_lock:	lock protecting @child_list_head, destroyed, and
+ *			  sync_pt.status
+ * @active_list_head:	list of active (unsignaled/errored) sync_pts
+ * @sync_timeline_list:	membership in global sync_timeline_list
+ */
+struct sync_timeline {
+	struct kref		kref;
+	const struct sync_timeline_ops	*ops;
+	char			name[32];
+
+	/* protected by child_list_lock */
+	bool			destroyed;
+	int			context, value;
+
+	struct list_head	child_list_head;
+	spinlock_t		child_list_lock;
+
+	struct list_head	active_list_head;
+
+#ifdef CONFIG_DEBUG_FS
+	struct list_head	sync_timeline_list;
+#endif
+};
+
+/**
+ * struct sync_pt - sync point
+ * @fence:		base fence class
+ * @child_list:		membership in sync_timeline.child_list_head
+ * @active_list:	membership in sync_timeline.active_list_head
+ * @signaled_list:	membership in temporary signaled_list on stack
+ * @fence:		sync_fence to which the sync_pt belongs
+ * @pt_list:		membership in sync_fence.pt_list_head
+ * @status:		1: signaled, 0:active, <0: error
+ * @timestamp:		time which sync_pt status transitioned from active to
+ *			  signaled or error.
+ */
+struct sync_pt {
+	struct fence base;
+
+	struct list_head	child_list;
+	struct list_head	active_list;
+};
+
+static inline struct sync_timeline *sync_pt_parent(struct sync_pt *pt)
+{
+	return container_of(pt->base.lock, struct sync_timeline,
+			    child_list_lock);
+}
+
+struct sync_fence_cb {
+	struct fence_cb cb;
+	struct fence *sync_pt;
+	struct sync_fence *fence;
+};
+
+/**
+ * struct sync_fence - sync fence
+ * @file:		file representing this fence
+ * @kref:		reference count on fence.
+ * @name:		name of sync_fence.  Useful for debugging
+ * @pt_list_head:	list of sync_pts in the fence.  immutable once fence
+ *			  is created
+ * @status:		0: signaled, >0:active, <0: error
+ *
+ * @wq:			wait queue for fence signaling
+ * @sync_fence_list:	membership in global fence list
+ */
+struct sync_fence {
+	struct file		*file;
+	struct kref		kref;
+	char			name[32];
+#ifdef CONFIG_DEBUG_FS
+	struct list_head	sync_fence_list;
+#endif
+	int num_fences;
+
+	wait_queue_head_t	wq;
+	atomic_t		status;
+
+	struct sync_fence_cb	cbs[];
+};
+
+struct sync_fence_waiter;
+typedef void (*sync_callback_t)(struct sync_fence *fence,
+				struct sync_fence_waiter *waiter);
+
+/**
+ * struct sync_fence_waiter - metadata for asynchronous waiter on a fence
+ * @waiter_list:	membership in sync_fence.waiter_list_head
+ * @callback:		function pointer to call when fence signals
+ * @callback_data:	pointer to pass to @callback
+ */
+struct sync_fence_waiter {
+	wait_queue_t work;
+	sync_callback_t callback;
+};
+
+static inline void sync_fence_waiter_init(struct sync_fence_waiter *waiter,
+					  sync_callback_t callback)
+{
+	INIT_LIST_HEAD(&waiter->work.task_list);
+	waiter->callback = callback;
+}
+
+/*
+ * API for sync_timeline implementers
+ */
+
+/**
+ * sync_timeline_create() - creates a sync object
+ * @ops:	specifies the implementation ops for the object
+ * @size:	size to allocate for this obj
+ * @name:	sync_timeline name
+ *
+ * Creates a new sync_timeline which will use the implementation specified by
+ * @ops.  @size bytes will be allocated allowing for implementation specific
+ * data to be kept after the generic sync_timeline struct.
+ */
+struct sync_timeline *sync_timeline_create(const struct sync_timeline_ops *ops,
+					   int size, const char *name);
+
+/**
+ * sync_timeline_destroy() - destroys a sync object
+ * @obj:	sync_timeline to destroy
+ *
+ * A sync implementation should call this when the @obj is going away
+ * (i.e. module unload.)  @obj won't actually be freed until all its children
+ * sync_pts are freed.
+ */
+void sync_timeline_destroy(struct sync_timeline *obj);
+
+/**
+ * sync_timeline_signal() - signal a status change on a sync_timeline
+ * @obj:	sync_timeline to signal
+ *
+ * A sync implementation should call this any time one of it's sync_pts
+ * has signaled or has an error condition.
+ */
+void sync_timeline_signal(struct sync_timeline *obj);
+
+/**
+ * sync_pt_create() - creates a sync pt
+ * @parent:	sync_pt's parent sync_timeline
+ * @size:	size to allocate for this pt
+ *
+ * Creates a new sync_pt as a child of @parent.  @size bytes will be
+ * allocated allowing for implementation specific data to be kept after
+ * the generic sync_timeline struct.
+ */
+struct sync_pt *sync_pt_create(struct sync_timeline *parent, int size);
+
+/**
+ * sync_pt_free() - frees a sync pt
+ * @pt:		sync_pt to free
+ *
+ * This should only be called on sync_pts which have been created but
+ * not added to a fence.
+ */
+void sync_pt_free(struct sync_pt *pt);
+
+/**
+ * sync_fence_create() - creates a sync fence
+ * @name:	name of fence to create
+ * @pt:		sync_pt to add to the fence
+ *
+ * Creates a fence containg @pt.  Once this is called, the fence takes
+ * ownership of @pt.
+ */
+struct sync_fence *sync_fence_create(const char *name, struct sync_pt *pt);
+
+/*
+ * API for sync_fence consumers
+ */
+
+/**
+ * sync_fence_merge() - merge two fences
+ * @name:	name of new fence
+ * @a:		fence a
+ * @b:		fence b
+ *
+ * Creates a new fence which contains copies of all the sync_pts in both
+ * @a and @b.  @a and @b remain valid, independent fences.
+ */
+struct sync_fence *sync_fence_merge(const char *name,
+				    struct sync_fence *a, struct sync_fence *b);
+
+/**
+ * sync_fence_fdget() - get a fence from an fd
+ * @fd:		fd referencing a fence
+ *
+ * Ensures @fd references a valid fence, increments the refcount of the backing
+ * file, and returns the fence.
+ */
+struct sync_fence *sync_fence_fdget(int fd);
+
+/**
+ * sync_fence_put() - puts a reference of a sync fence
+ * @fence:	fence to put
+ *
+ * Puts a reference on @fence.  If this is the last reference, the fence and
+ * all it's sync_pts will be freed
+ */
+void sync_fence_put(struct sync_fence *fence);
+
+/**
+ * sync_fence_install() - installs a fence into a file descriptor
+ * @fence:	fence to install
+ * @fd:		file descriptor in which to install the fence
+ *
+ * Installs @fence into @fd.  @fd's should be acquired through
+ * get_unused_fd_flags(O_CLOEXEC).
+ */
+void sync_fence_install(struct sync_fence *fence, int fd);
+
+/**
+ * sync_fence_wait_async() - registers and async wait on the fence
+ * @fence:		fence to wait on
+ * @waiter:		waiter callback struck
+ *
+ * Returns 1 if @fence has already signaled.
+ *
+ * Registers a callback to be called when @fence signals or has an error.
+ * @waiter should be initialized with sync_fence_waiter_init().
+ */
+int sync_fence_wait_async(struct sync_fence *fence,
+			  struct sync_fence_waiter *waiter);
+
+/**
+ * sync_fence_cancel_async() - cancels an async wait
+ * @fence:		fence to wait on
+ * @waiter:		waiter callback struck
+ *
+ * returns 0 if waiter was removed from fence's async waiter list.
+ * returns -ENOENT if waiter was not found on fence's async waiter list.
+ *
+ * Cancels a previously registered async wait.  Will fail gracefully if
+ * @waiter was never registered or if @fence has already signaled @waiter.
+ */
+int sync_fence_cancel_async(struct sync_fence *fence,
+			    struct sync_fence_waiter *waiter);
+
+/**
+ * sync_fence_wait() - wait on fence
+ * @fence:	fence to wait on
+ * @tiemout:	timeout in ms
+ *
+ * Wait for @fence to be signaled or have an error.  Waits indefinitely
+ * if @timeout < 0
+ */
+int sync_fence_wait(struct sync_fence *fence, long timeout);
+
+#ifdef CONFIG_DEBUG_FS
+
+extern void sync_timeline_debug_add(struct sync_timeline *obj);
+extern void sync_timeline_debug_remove(struct sync_timeline *obj);
+extern void sync_fence_debug_add(struct sync_fence *fence);
+extern void sync_fence_debug_remove(struct sync_fence *fence);
+extern void sync_dump(void);
+
+#else
+# define sync_timeline_debug_add(obj)
+# define sync_timeline_debug_remove(obj)
+# define sync_fence_debug_add(fence)
+# define sync_fence_debug_remove(fence)
+# define sync_dump()
+#endif
+int sync_fence_wake_up_wq(wait_queue_t *curr, unsigned mode,
+				 int wake_flags, void *key);
+
+#endif /* _LINUX_SYNC_H */