[linux-2.6-block.git] / drivers / dma-buf / sw_sync.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Sync File validation framework
 *
 * Copyright (C) 2012 Google, Inc.
 */

#include <linux/file.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/sync_file.h>

#include "sync_debug.h"

#define CREATE_TRACE_POINTS
#include "sync_trace.h"

/*
 * SW SYNC validation framework
 *
 * A sync object driver that uses a 32bit counter to coordinate
 * synchronization.  Useful when there is no hardware primitive backing
 * the synchronization.
 *
 * To start the framework just open:
 *
 * <debugfs>/sync/sw_sync
 *
 * That will create a sync timeline, all fences created under this timeline
 * file descriptor will belong to the this timeline.
 *
 * The 'sw_sync' file can be opened many times as to create different
 * timelines.
 *
 * Fences can be created with SW_SYNC_IOC_CREATE_FENCE ioctl with struct
 * sw_sync_create_fence_data as parameter.
 *
 * To increment the timeline counter, SW_SYNC_IOC_INC ioctl should be used
 * with the increment as u32. This will update the last signaled value
 * from the timeline and signal any fence that has a seqno smaller or equal
 * to it.
 *
 * struct sw_sync_create_fence_data
 * @value:	the seqno to initialise the fence with
 * @name:	the name of the new sync point
 * @fence:	return the fd of the new sync_file with the created fence
 */
struct sw_sync_create_fence_data {
	__u32	value;
	char	name[32];
	__s32	fence; /* fd of new fence */
};

#define SW_SYNC_IOC_MAGIC	'W'

#define SW_SYNC_IOC_CREATE_FENCE	_IOWR(SW_SYNC_IOC_MAGIC, 0,\
		struct sw_sync_create_fence_data)

#define SW_SYNC_IOC_INC			_IOW(SW_SYNC_IOC_MAGIC, 1, __u32)

static const struct dma_fence_ops timeline_fence_ops;

static inline struct sync_pt *dma_fence_to_sync_pt(struct dma_fence *fence)
{
	if (fence->ops != &timeline_fence_ops)
		return NULL;
	return container_of(fence, struct sync_pt, base);
}

/**
 * sync_timeline_create() - creates a sync object
 * @name:	sync_timeline name
 *
 * Creates a new sync_timeline. Returns the sync_timeline object or NULL in
 * case of error.
 */
static struct sync_timeline *sync_timeline_create(const char *name)
{
	struct sync_timeline *obj;

	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
	if (!obj)
		return NULL;

	kref_init(&obj->kref);
	obj->context = dma_fence_context_alloc(1);
	strlcpy(obj->name, name, sizeof(obj->name));

	obj->pt_tree = RB_ROOT;
	INIT_LIST_HEAD(&obj->pt_list);
	spin_lock_init(&obj->lock);

	sync_timeline_debug_add(obj);

	return obj;
}

static void sync_timeline_free(struct kref *kref)
{
	struct sync_timeline *obj =
		container_of(kref, struct sync_timeline, kref);

	sync_timeline_debug_remove(obj);

	kfree(obj);
}

static void sync_timeline_get(struct sync_timeline *obj)
{
	kref_get(&obj->kref);
}

static void sync_timeline_put(struct sync_timeline *obj)
{
	kref_put(&obj->kref, sync_timeline_free);
}

static const char *timeline_fence_get_driver_name(struct dma_fence *fence)
{
	return "sw_sync";
}

static const char *timeline_fence_get_timeline_name(struct dma_fence *fence)
{
	struct sync_timeline *parent = dma_fence_parent(fence);

	return parent->name;
}

static void timeline_fence_release(struct dma_fence *fence)
{
	struct sync_pt *pt = dma_fence_to_sync_pt(fence);
	struct sync_timeline *parent = dma_fence_parent(fence);
	unsigned long flags;

	spin_lock_irqsave(fence->lock, flags);
	if (!list_empty(&pt->link)) {
		list_del(&pt->link);
		rb_erase(&pt->node, &parent->pt_tree);
	}
	spin_unlock_irqrestore(fence->lock, flags);

	sync_timeline_put(parent);
	dma_fence_free(fence);
}

static bool timeline_fence_signaled(struct dma_fence *fence)
{
	struct sync_timeline *parent = dma_fence_parent(fence);

	return !__dma_fence_is_later(fence->seqno, parent->value, fence->ops);
}

static bool timeline_fence_enable_signaling(struct dma_fence *fence)
{
	return true;
}

static void timeline_fence_value_str(struct dma_fence *fence,
				    char *str, int size)
{
	snprintf(str, size, "%lld", fence->seqno);
}

static void timeline_fence_timeline_value_str(struct dma_fence *fence,
					     char *str, int size)
{
	struct sync_timeline *parent = dma_fence_parent(fence);

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

static const struct dma_fence_ops timeline_fence_ops = {
	.get_driver_name = timeline_fence_get_driver_name,
	.get_timeline_name = timeline_fence_get_timeline_name,
	.enable_signaling = timeline_fence_enable_signaling,
	.signaled = timeline_fence_signaled,
	.release = timeline_fence_release,
	.fence_value_str = timeline_fence_value_str,
	.timeline_value_str = timeline_fence_timeline_value_str,
};

/**
 * sync_timeline_signal() - signal a status change on a sync_timeline
 * @obj:	sync_timeline to signal
 * @inc:	num to increment on timeline->value
 *
 * A sync implementation should call this any time one of it's fences
 * has signaled or has an error condition.
 */
static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc)
{
	struct sync_pt *pt, *next;

	trace_sync_timeline(obj);

	spin_lock_irq(&obj->lock);

	obj->value += inc;

	list_for_each_entry_safe(pt, next, &obj->pt_list, link) {
		if (!timeline_fence_signaled(&pt->base))
			break;

		list_del_init(&pt->link);
		rb_erase(&pt->node, &obj->pt_tree);

		/*
		 * A signal callback may release the last reference to this
		 * fence, causing it to be freed. That operation has to be
		 * last to avoid a use after free inside this loop, and must
		 * be after we remove the fence from the timeline in order to
		 * prevent deadlocking on timeline->lock inside
		 * timeline_fence_release().
		 */
		dma_fence_signal_locked(&pt->base);
	}

	spin_unlock_irq(&obj->lock);
}

/**
 * sync_pt_create() - creates a sync pt
 * @obj:	parent sync_timeline
 * @value:	value of the fence
 *
 * Creates a new sync_pt (fence) as a child of @parent.  @size bytes will be
 * allocated allowing for implementation specific data to be kept after
 * the generic sync_timeline struct. Returns the sync_pt object or
 * NULL in case of error.
 */
static struct sync_pt *sync_pt_create(struct sync_timeline *obj,
				      unsigned int value)
{
	struct sync_pt *pt;

	pt = kzalloc(sizeof(*pt), GFP_KERNEL);
	if (!pt)
		return NULL;

	sync_timeline_get(obj);
	dma_fence_init(&pt->base, &timeline_fence_ops, &obj->lock,
		       obj->context, value);
	INIT_LIST_HEAD(&pt->link);

	spin_lock_irq(&obj->lock);
	if (!dma_fence_is_signaled_locked(&pt->base)) {
		struct rb_node **p = &obj->pt_tree.rb_node;
		struct rb_node *parent = NULL;

		while (*p) {
			struct sync_pt *other;
			int cmp;

			parent = *p;
			other = rb_entry(parent, typeof(*pt), node);
			cmp = value - other->base.seqno;
			if (cmp > 0) {
				p = &parent->rb_right;
			} else if (cmp < 0) {
				p = &parent->rb_left;
			} else {
				if (dma_fence_get_rcu(&other->base)) {
					sync_timeline_put(obj);
					kfree(pt);
					pt = other;
					goto unlock;
				}
				p = &parent->rb_left;
			}
		}
		rb_link_node(&pt->node, parent, p);
		rb_insert_color(&pt->node, &obj->pt_tree);

		parent = rb_next(&pt->node);
		list_add_tail(&pt->link,
			      parent ? &rb_entry(parent, typeof(*pt), node)->link : &obj->pt_list);
	}
unlock:
	spin_unlock_irq(&obj->lock);

	return pt;
}

/*
 * *WARNING*
 *
 * improper use of this can result in deadlocking kernel drivers from userspace.
 */

/* opening sw_sync create a new sync obj */
static int sw_sync_debugfs_open(struct inode *inode, struct file *file)
{
	struct sync_timeline *obj;
	char task_comm[TASK_COMM_LEN];

	get_task_comm(task_comm, current);

	obj = sync_timeline_create(task_comm);
	if (!obj)
		return -ENOMEM;

	file->private_data = obj;

	return 0;
}

static int sw_sync_debugfs_release(struct inode *inode, struct file *file)
{
	struct sync_timeline *obj = file->private_data;
	struct sync_pt *pt, *next;

	spin_lock_irq(&obj->lock);

	list_for_each_entry_safe(pt, next, &obj->pt_list, link) {
		dma_fence_set_error(&pt->base, -ENOENT);
		dma_fence_signal_locked(&pt->base);
	}

	spin_unlock_irq(&obj->lock);

	sync_timeline_put(obj);
	return 0;
}

static long sw_sync_ioctl_create_fence(struct sync_timeline *obj,
				       unsigned long arg)
{
	int fd = get_unused_fd_flags(O_CLOEXEC);
	int err;
	struct sync_pt *pt;
	struct sync_file *sync_file;
	struct sw_sync_create_fence_data data;

	if (fd < 0)
		return fd;

	if (copy_from_user(&data, (void __user *)arg, sizeof(data))) {
		err = -EFAULT;
		goto err;
	}

	pt = sync_pt_create(obj, data.value);
	if (!pt) {
		err = -ENOMEM;
		goto err;
	}

	sync_file = sync_file_create(&pt->base);
	dma_fence_put(&pt->base);
	if (!sync_file) {
		err = -ENOMEM;
		goto err;
	}

	data.fence = fd;
	if (copy_to_user((void __user *)arg, &data, sizeof(data))) {
		fput(sync_file->file);
		err = -EFAULT;
		goto err;
	}

	fd_install(fd, sync_file->file);

	return 0;

err:
	put_unused_fd(fd);
	return err;
}

static long sw_sync_ioctl_inc(struct sync_timeline *obj, unsigned long arg)
{
	u32 value;

	if (copy_from_user(&value, (void __user *)arg, sizeof(value)))
		return -EFAULT;

	while (value > INT_MAX)  {
		sync_timeline_signal(obj, INT_MAX);
		value -= INT_MAX;
	}

	sync_timeline_signal(obj, value);

	return 0;
}

static long sw_sync_ioctl(struct file *file, unsigned int cmd,
			  unsigned long arg)
{
	struct sync_timeline *obj = file->private_data;

	switch (cmd) {
	case SW_SYNC_IOC_CREATE_FENCE:
		return sw_sync_ioctl_create_fence(obj, arg);

	case SW_SYNC_IOC_INC:
		return sw_sync_ioctl_inc(obj, arg);

	default:
		return -ENOTTY;
	}
}

const struct file_operations sw_sync_debugfs_fops = {
	.open           = sw_sync_debugfs_open,
	.release        = sw_sync_debugfs_release,
	.unlocked_ioctl = sw_sync_ioctl,
	.compat_ioctl	= sw_sync_ioctl,
};
Commit	Line	Data
9c92ab61	1	// SPDX-License-Identifier: GPL-2.0-only
1867a23b	2	/*
e912c881	3	* Sync File validation framework
1867a23b GP	4	*
1867a23b GP	5	* Copyright (C) 2012 Google, Inc.
1867a23b GP	6	*/
	7
	8	#include <linux/file.h>
	9	#include <linux/fs.h>
	10	#include <linux/uaccess.h>
aff9da10	11	#include <linux/slab.h>
1867a23b GP	12	#include <linux/sync_file.h>
1867a23b GP	13
1fe82e2e	14	#include "sync_debug.h"
1867a23b	15
aff9da10	16	#define CREATE_TRACE_POINTS
a04f915e	17	#include "sync_trace.h"
aff9da10	18
fc0c9a03 GP	19	/*
	20	* SW SYNC validation framework
	21	*
	22	* A sync object driver that uses a 32bit counter to coordinate
	23	* synchronization. Useful when there is no hardware primitive backing
	24	* the synchronization.
	25	*
	26	* To start the framework just open:
	27	*
	28	* <debugfs>/sync/sw_sync
	29	*
	30	* That will create a sync timeline, all fences created under this timeline
	31	* file descriptor will belong to the this timeline.
	32	*
	33	* The 'sw_sync' file can be opened many times as to create different
	34	* timelines.
	35	*
	36	* Fences can be created with SW_SYNC_IOC_CREATE_FENCE ioctl with struct
e56a0fbd	37	* sw_sync_create_fence_data as parameter.
fc0c9a03 GP	38	*
	39	* To increment the timeline counter, SW_SYNC_IOC_INC ioctl should be used
	40	* with the increment as u32. This will update the last signaled value
	41	* from the timeline and signal any fence that has a seqno smaller or equal
	42	* to it.
	43	*
e56a0fbd	44	* struct sw_sync_create_fence_data
fc0c9a03 GP	45	* @value: the seqno to initialise the fence with
	46	* @name: the name of the new sync point
	47	* @fence: return the fd of the new sync_file with the created fence
	48	*/
6f65aa89 GP	49	struct sw_sync_create_fence_data {
	50	__u32 value;
	51	char name[32];
	52	__s32 fence; /* fd of new fence */
	53	};
	54
	55	#define SW_SYNC_IOC_MAGIC 'W'
	56
	57	#define SW_SYNC_IOC_CREATE_FENCE _IOWR(SW_SYNC_IOC_MAGIC, 0,\
	58	struct sw_sync_create_fence_data)
fc0c9a03	59
6f65aa89 GP	60	#define SW_SYNC_IOC_INC _IOW(SW_SYNC_IOC_MAGIC, 1, __u32)
6f65aa89 GP	61
f54d1867	62	static const struct dma_fence_ops timeline_fence_ops;
aff9da10	63
f54d1867	64	static inline struct sync_pt dma_fence_to_sync_pt(struct dma_fence fence)
aff9da10 GP	65	{
	66	if (fence->ops != &timeline_fence_ops)
	67	return NULL;
	68	return container_of(fence, struct sync_pt, base);
	69	}
	70
	71	/**
	72	* sync_timeline_create() - creates a sync object
aff9da10 GP	73	* @name: sync_timeline name
	74	*
	75	* Creates a new sync_timeline. Returns the sync_timeline object or NULL in
	76	* case of error.
	77	*/
74881588	78	static struct sync_timeline sync_timeline_create(const char name)
aff9da10 GP	79	{
	80	struct sync_timeline *obj;
	81
	82	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
	83	if (!obj)
	84	return NULL;
	85
	86	kref_init(&obj->kref);
f54d1867	87	obj->context = dma_fence_context_alloc(1);
aff9da10	88	strlcpy(obj->name, name, sizeof(obj->name));
aff9da10	89
f1e8c671	90	obj->pt_tree = RB_ROOT;
d3862e44 CW	91	INIT_LIST_HEAD(&obj->pt_list);
d3862e44 CW	92	spin_lock_init(&obj->lock);
aff9da10 GP	93
	94	sync_timeline_debug_add(obj);
	95
	96	return obj;
	97	}
	98
	99	static void sync_timeline_free(struct kref *kref)
	100	{
	101	struct sync_timeline *obj =
	102	container_of(kref, struct sync_timeline, kref);
	103
	104	sync_timeline_debug_remove(obj);
	105
	106	kfree(obj);
	107	}
	108
	109	static void sync_timeline_get(struct sync_timeline *obj)
	110	{
	111	kref_get(&obj->kref);
	112	}
	113
	114	static void sync_timeline_put(struct sync_timeline *obj)
	115	{
	116	kref_put(&obj->kref, sync_timeline_free);
	117	}
	118
150b6a9d GP	119	static const char timeline_fence_get_driver_name(struct dma_fence fence)
	120	{
	121	return "sw_sync";
	122	}
	123
	124	static const char timeline_fence_get_timeline_name(struct dma_fence fence)
	125	{
	126	struct sync_timeline *parent = dma_fence_parent(fence);
	127
	128	return parent->name;
	129	}
	130
	131	static void timeline_fence_release(struct dma_fence *fence)
	132	{
	133	struct sync_pt *pt = dma_fence_to_sync_pt(fence);
	134	struct sync_timeline *parent = dma_fence_parent(fence);
d3c6dd1f	135	unsigned long flags;
150b6a9d	136
d3c6dd1f	137	spin_lock_irqsave(fence->lock, flags);
150b6a9d	138	if (!list_empty(&pt->link)) {
d3c6dd1f CW	139	list_del(&pt->link);
d3c6dd1f CW	140	rb_erase(&pt->node, &parent->pt_tree);
150b6a9d	141	}
d3c6dd1f	142	spin_unlock_irqrestore(fence->lock, flags);
150b6a9d GP	143
	144	sync_timeline_put(parent);
	145	dma_fence_free(fence);
	146	}
	147
	148	static bool timeline_fence_signaled(struct dma_fence *fence)
	149	{
	150	struct sync_timeline *parent = dma_fence_parent(fence);
	151
5e498abf	152	return !__dma_fence_is_later(fence->seqno, parent->value, fence->ops);
150b6a9d GP	153	}
	154
	155	static bool timeline_fence_enable_signaling(struct dma_fence *fence)
	156	{
	157	return true;
	158	}
	159
	160	static void timeline_fence_value_str(struct dma_fence *fence,
	161	char *str, int size)
	162	{
b312d8ca	163	snprintf(str, size, "%lld", fence->seqno);
150b6a9d GP	164	}
	165
	166	static void timeline_fence_timeline_value_str(struct dma_fence *fence,
	167	char *str, int size)
	168	{
	169	struct sync_timeline *parent = dma_fence_parent(fence);
	170
	171	snprintf(str, size, "%d", parent->value);
	172	}
	173
	174	static const struct dma_fence_ops timeline_fence_ops = {
	175	.get_driver_name = timeline_fence_get_driver_name,
	176	.get_timeline_name = timeline_fence_get_timeline_name,
	177	.enable_signaling = timeline_fence_enable_signaling,
	178	.signaled = timeline_fence_signaled,
150b6a9d GP	179	.release = timeline_fence_release,
	180	.fence_value_str = timeline_fence_value_str,
	181	.timeline_value_str = timeline_fence_timeline_value_str,
	182	};
	183
aff9da10 GP	184	/**
	185	* sync_timeline_signal() - signal a status change on a sync_timeline
	186	* @obj: sync_timeline to signal
	187	* @inc: num to increment on timeline->value
	188	*
	189	* A sync implementation should call this any time one of it's fences
	190	* has signaled or has an error condition.
	191	*/
	192	static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc)
	193	{
aff9da10 GP	194	struct sync_pt pt, next;
	195
	196	trace_sync_timeline(obj);
	197
d3862e44	198	spin_lock_irq(&obj->lock);
aff9da10 GP	199
	200	obj->value += inc;
	201
f1e8c671	202	list_for_each_entry_safe(pt, next, &obj->pt_list, link) {
3792b7c1	203	if (!timeline_fence_signaled(&pt->base))
f1e8c671 CW	204	break;
	205
	206	list_del_init(&pt->link);
	207	rb_erase(&pt->node, &obj->pt_tree);
3792b7c1 GP	208
	209	/*
	210	* A signal callback may release the last reference to this
	211	* fence, causing it to be freed. That operation has to be
	212	* last to avoid a use after free inside this loop, and must
	213	* be after we remove the fence from the timeline in order to
	214	* prevent deadlocking on timeline->lock inside
	215	* timeline_fence_release().
	216	*/
	217	dma_fence_signal_locked(&pt->base);
f1e8c671	218	}
aff9da10	219
d3862e44	220	spin_unlock_irq(&obj->lock);
aff9da10 GP	221	}
	222
	223	/**
	224	* sync_pt_create() - creates a sync pt
b88132b4 CW	225	* @obj: parent sync_timeline
b88132b4 CW	226	* @value: value of the fence
aff9da10	227	*
b88132b4	228	* Creates a new sync_pt (fence) as a child of @parent. @size bytes will be
aff9da10 GP	229	* allocated allowing for implementation specific data to be kept after
	230	* the generic sync_timeline struct. Returns the sync_pt object or
	231	* NULL in case of error.
	232	*/
3b52ce44 CW	233	static struct sync_pt sync_pt_create(struct sync_timeline obj,
3b52ce44 CW	234	unsigned int value)
aff9da10	235	{
aff9da10 GP	236	struct sync_pt *pt;
aff9da10 GP	237
3b52ce44	238	pt = kzalloc(sizeof(*pt), GFP_KERNEL);
aff9da10 GP	239	if (!pt)
	240	return NULL;
	241
aff9da10	242	sync_timeline_get(obj);
d3862e44	243	dma_fence_init(&pt->base, &timeline_fence_ops, &obj->lock,
f54d1867	244	obj->context, value);
d3862e44	245	INIT_LIST_HEAD(&pt->link);
a6aa8fca	246
d3862e44	247	spin_lock_irq(&obj->lock);
f1e8c671 CW	248	if (!dma_fence_is_signaled_locked(&pt->base)) {
	249	struct rb_node **p = &obj->pt_tree.rb_node;
	250	struct rb_node *parent = NULL;
	251
	252	while (*p) {
	253	struct sync_pt *other;
	254	int cmp;
	255
	256	parent = *p;
	257	other = rb_entry(parent, typeof(*pt), node);
	258	cmp = value - other->base.seqno;
	259	if (cmp > 0) {
	260	p = &parent->rb_right;
	261	} else if (cmp < 0) {
	262	p = &parent->rb_left;
	263	} else {
	264	if (dma_fence_get_rcu(&other->base)) {
d3c6dd1f CW	265	sync_timeline_put(obj);
d3c6dd1f CW	266	kfree(pt);
f1e8c671 CW	267	pt = other;
	268	goto unlock;
	269	}
	270	p = &parent->rb_left;
	271	}
	272	}
	273	rb_link_node(&pt->node, parent, p);
	274	rb_insert_color(&pt->node, &obj->pt_tree);
	275
	276	parent = rb_next(&pt->node);
	277	list_add_tail(&pt->link,
	278	parent ? &rb_entry(parent, typeof(*pt), node)->link : &obj->pt_list);
	279	}
	280	unlock:
d3862e44	281	spin_unlock_irq(&obj->lock);
a6aa8fca	282
aff9da10 GP	283	return pt;
	284	}
	285
1867a23b GP	286	/*
	287	* WARNING
	288	*
	289	* improper use of this can result in deadlocking kernel drivers from userspace.
	290	*/
	291
	292	/* opening sw_sync create a new sync obj */
	293	static int sw_sync_debugfs_open(struct inode inode, struct file file)
	294	{
	295	struct sync_timeline *obj;
	296	char task_comm[TASK_COMM_LEN];
	297
	298	get_task_comm(task_comm, current);
	299
b9bc2b7b	300	obj = sync_timeline_create(task_comm);
1867a23b GP	301	if (!obj)
	302	return -ENOMEM;
	303
	304	file->private_data = obj;
	305
	306	return 0;
	307	}
	308
	309	static int sw_sync_debugfs_release(struct inode inode, struct file file)
	310	{
	311	struct sync_timeline *obj = file->private_data;
ea4d5a27 DB	312	struct sync_pt pt, next;
	313
	314	spin_lock_irq(&obj->lock);
	315
	316	list_for_each_entry_safe(pt, next, &obj->pt_list, link) {
	317	dma_fence_set_error(&pt->base, -ENOENT);
	318	dma_fence_signal_locked(&pt->base);
	319	}
1867a23b	320
ea4d5a27	321	spin_unlock_irq(&obj->lock);
71110232 GP	322
71110232 GP	323	sync_timeline_put(obj);
1867a23b GP	324	return 0;
	325	}
	326
	327	static long sw_sync_ioctl_create_fence(struct sync_timeline *obj,
	328	unsigned long arg)
	329	{
	330	int fd = get_unused_fd_flags(O_CLOEXEC);
	331	int err;
	332	struct sync_pt *pt;
	333	struct sync_file *sync_file;
	334	struct sw_sync_create_fence_data data;
	335
	336	if (fd < 0)
	337	return fd;
	338
	339	if (copy_from_user(&data, (void __user *)arg, sizeof(data))) {
	340	err = -EFAULT;
	341	goto err;
	342	}
	343
3b52ce44	344	pt = sync_pt_create(obj, data.value);
1867a23b GP	345	if (!pt) {
	346	err = -ENOMEM;
	347	goto err;
	348	}
	349
	350	sync_file = sync_file_create(&pt->base);
4592bfcd	351	dma_fence_put(&pt->base);
1867a23b	352	if (!sync_file) {
1867a23b GP	353	err = -ENOMEM;
	354	goto err;
	355	}
	356
	357	data.fence = fd;
	358	if (copy_to_user((void __user *)arg, &data, sizeof(data))) {
	359	fput(sync_file->file);
	360	err = -EFAULT;
	361	goto err;
	362	}
	363
	364	fd_install(fd, sync_file->file);
	365
	366	return 0;
	367
	368	err:
	369	put_unused_fd(fd);
	370	return err;
	371	}
	372
	373	static long sw_sync_ioctl_inc(struct sync_timeline *obj, unsigned long arg)
	374	{
	375	u32 value;
	376
	377	if (copy_from_user(&value, (void __user *)arg, sizeof(value)))
	378	return -EFAULT;
	379
8f66d3aa CW	380	while (value > INT_MAX) {
	381	sync_timeline_signal(obj, INT_MAX);
	382	value -= INT_MAX;
	383	}
	384
1867a23b GP	385	sync_timeline_signal(obj, value);
	386
	387	return 0;
	388	}
	389
	390	static long sw_sync_ioctl(struct file *file, unsigned int cmd,
	391	unsigned long arg)
	392	{
	393	struct sync_timeline *obj = file->private_data;
	394
	395	switch (cmd) {
	396	case SW_SYNC_IOC_CREATE_FENCE:
	397	return sw_sync_ioctl_create_fence(obj, arg);
	398
	399	case SW_SYNC_IOC_INC:
	400	return sw_sync_ioctl_inc(obj, arg);
	401
	402	default:
	403	return -ENOTTY;
	404	}
	405	}
	406
	407	const struct file_operations sw_sync_debugfs_fops = {
	408	.open = sw_sync_debugfs_open,
	409	.release = sw_sync_debugfs_release,
	410	.unlocked_ioctl = sw_sync_ioctl,
	411	.compat_ioctl = sw_sync_ioctl,
	412	};