Commit 0f0d8406 authored by Maarten Lankhorst's avatar Maarten Lankhorst Committed by Greg Kroah-Hartman
Browse files

android: convert sync to fence api, v6 



Just to show it's easy.

Android syncpoints can be mapped to a timeline. This removes the need
to maintain a separate api for synchronization. I've left the android
trace events in place, but the core fence events should already be
sufficient for debugging.

v2:
- Call fence_remove_callback in sync_fence_free if not all fences have fired.
v3:
- Merge Colin Cross' bugfixes, and the android fence merge optimization.
v4:
- Merge with the upstream fixes.
v5:
- Fix small style issues pointed out by Thomas Hellstrom.
v6:
- Fix for updates to fence api.

Signed-off-by: default avatarMaarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: default avatarJohn Stultz <john.stultz@linaro.org>
Acked-by: default avatarSumit Semwal <sumit.semwal@linaro.org>
Acked-by: default avatarDaniel Vetter <daniel@ffwll.ch>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3aac4502

drivers/staging/android/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -88,6 +88,7 @@ config SYNC 
	bool "Synchronization framework"

	default n

	select ANON_INODES

	select DMA_SHARED_BUFFER

	---help---

	  This option enables the framework for synchronization between multiple

	  drivers.  Sync implementations can take advantage of hardware

drivers/staging/android/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -9,5 +9,5 @@ obj-$(CONFIG_ANDROID_TIMED_OUTPUT) += timed_output.o 
obj-$(CONFIG_ANDROID_TIMED_GPIO)	+= timed_gpio.o

obj-$(CONFIG_ANDROID_LOW_MEMORY_KILLER)	+= lowmemorykiller.o

obj-$(CONFIG_ANDROID_INTF_ALARM_DEV)	+= alarm-dev.o

obj-$(CONFIG_SYNC)			+= sync.o

obj-$(CONFIG_SYNC)			+= sync.o sync_debug.o

obj-$(CONFIG_SW_SYNC)			+= sw_sync.o

drivers/staging/android/sw_sync.c

+2 −4
Original line number Diff line number Diff line
@@ -50,7 +50,7 @@ static struct sync_pt *sw_sync_pt_dup(struct sync_pt *sync_pt) 
{

	struct sw_sync_pt *pt = (struct sw_sync_pt *) sync_pt;

	struct sw_sync_timeline *obj =

		(struct sw_sync_timeline *)sync_pt->parent;

		(struct sw_sync_timeline *)sync_pt_parent(sync_pt);



	return (struct sync_pt *) sw_sync_pt_create(obj, pt->value);

}
@@ -59,7 +59,7 @@ static int sw_sync_pt_has_signaled(struct sync_pt *sync_pt) 
{

	struct sw_sync_pt *pt = (struct sw_sync_pt *)sync_pt;

	struct sw_sync_timeline *obj =

		(struct sw_sync_timeline *)sync_pt->parent;

		(struct sw_sync_timeline *)sync_pt_parent(sync_pt);



	return sw_sync_cmp(obj->value, pt->value) >= 0;

}
@@ -97,7 +97,6 @@ static void sw_sync_pt_value_str(struct sync_pt *sync_pt, 
				       char *str, int size)

{

	struct sw_sync_pt *pt = (struct sw_sync_pt *)sync_pt;



	snprintf(str, size, "%d", pt->value);

}
@@ -157,7 +156,6 @@ static int sw_sync_open(struct inode *inode, struct file *file) 
static int sw_sync_release(struct inode *inode, struct file *file)

{

	struct sw_sync_timeline *obj = file->private_data;



	sync_timeline_destroy(&obj->obj);

	return 0;

}

drivers/staging/android/sync.c

+307 −606

File changed.

Preview size limit exceeded, changes collapsed.

drivers/staging/android/sync.h

+45 −34
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/list.h>

#include <linux/spinlock.h>

#include <linux/wait.h>

#include <linux/fence.h>



#include "uapi/sync.h"
@@ -40,8 +41,6 @@ struct sync_fence; 
 *			 -1 if a will signal before b

 * @free_pt:		called before sync_pt is freed

 * @release_obj:	called before sync_timeline is freed

 * @print_obj:		deprecated

 * @print_pt:		deprecated

 * @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
@@ -67,13 +66,6 @@ struct sync_timeline_ops { 
	/* optional */

	void (*release_obj)(struct sync_timeline *sync_timeline);



	/* deprecated */

	void (*print_obj)(struct seq_file *s,

			  struct sync_timeline *sync_timeline);



	/* deprecated */

	void (*print_pt)(struct seq_file *s, struct sync_pt *sync_pt);



	/* optional */

	int (*fill_driver_data)(struct sync_pt *syncpt, void *data, int size);
@@ -104,19 +96,21 @@ struct sync_timeline { 


	/* 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;

	spinlock_t		active_list_lock;



#ifdef CONFIG_DEBUG_FS

	struct list_head	sync_timeline_list;

#endif

};



/**

 * struct sync_pt - sync point

 * @parent:		sync_timeline to which this sync_pt belongs

 * @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
@@ -127,19 +121,22 @@ struct sync_timeline { 
 *			  signaled or error.

 */

struct sync_pt {

	struct sync_timeline		*parent;

	struct list_head	child_list;

	struct fence base;



	struct list_head	child_list;

	struct list_head	active_list;

	struct list_head	signaled_list;



	struct sync_fence	*fence;

	struct list_head	pt_list;

};



	/* protected by parent->active_list_lock */

	int			status;

static inline struct sync_timeline *sync_pt_parent(struct sync_pt *pt)

{

	return container_of(pt->base.lock, struct sync_timeline,

			    child_list_lock);

}



	ktime_t			timestamp;

struct sync_fence_cb {

	struct fence_cb cb;

	struct fence *sync_pt;

	struct sync_fence *fence;

};



/**
@@ -149,9 +146,7 @@ struct sync_pt { 
 * @name:		name of sync_fence.  Useful for debugging

 * @pt_list_head:	list of sync_pts in the fence.  immutable once fence

 *			  is created

 * @waiter_list_head:	list of asynchronous waiters on this fence

 * @waiter_list_lock:	lock protecting @waiter_list_head and @status

 * @status:		1: signaled, 0:active, <0: error

 * @status:		0: signaled, >0:active, <0: error

 *

 * @wq:			wait queue for fence signaling

 * @sync_fence_list:	membership in global fence list
@@ -160,17 +155,15 @@ struct sync_fence { 
	struct file		*file;

	struct kref		kref;

	char			name[32];



	/* this list is immutable once the fence is created */

	struct list_head	pt_list_head;



	struct list_head	waiter_list_head;

	spinlock_t		waiter_list_lock; /* also protects status */

	int			status;

#ifdef CONFIG_DEBUG_FS

	struct list_head	sync_fence_list;

#endif

	int num_fences;



	wait_queue_head_t	wq;

	atomic_t		status;



	struct list_head	sync_fence_list;

	struct sync_fence_cb	cbs[];

};



struct sync_fence_waiter;
@@ -184,14 +177,14 @@ typedef void (*sync_callback_t)(struct sync_fence *fence, 
 * @callback_data:	pointer to pass to @callback

 */

struct sync_fence_waiter {

	struct list_head	waiter_list;



	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;

}
@@ -341,4 +334,22 @@ int sync_fence_cancel_async(struct sync_fence *fence, 
 */

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 */

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