[mirror_ubuntu-bionic-kernel.git] / drivers / dma-buf / sw_sync.c

/*
 * Sync File validation framework
 *
 * Copyright (C) 2012 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 */

#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_ioctl_create_fence 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_ioctl_create_fence
 * @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);

	if (!list_empty(&pt->link)) {
		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);
}

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, "%d", 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,
	.wait = dma_fence_default_wait,
	.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
 * @parent:	fence's parent sync_timeline
 * @inc:	value of the fence
 *
 * 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. 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)) {
					dma_fence_put(&pt->base);
					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
1867a23b	1	/*
e912c881	2	* Sync File validation framework
1867a23b GP	3	*
	4	* Copyright (C) 2012 Google, Inc.
	5	*
	6	* This software is licensed under the terms of the GNU General Public
	7	* License version 2, as published by the Free Software Foundation, and
	8	* may be copied, distributed, and modified under those terms.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	*/
	16
	17	#include <linux/file.h>
	18	#include <linux/fs.h>
	19	#include <linux/uaccess.h>
aff9da10	20	#include <linux/slab.h>
1867a23b GP	21	#include <linux/sync_file.h>
1867a23b GP	22
1fe82e2e	23	#include "sync_debug.h"
1867a23b	24
aff9da10	25	#define CREATE_TRACE_POINTS
a04f915e	26	#include "sync_trace.h"
aff9da10	27
fc0c9a03 GP	28	/*
	29	* SW SYNC validation framework
	30	*
	31	* A sync object driver that uses a 32bit counter to coordinate
	32	* synchronization. Useful when there is no hardware primitive backing
	33	* the synchronization.
	34	*
	35	* To start the framework just open:
	36	*
	37	* <debugfs>/sync/sw_sync
	38	*
	39	* That will create a sync timeline, all fences created under this timeline
	40	* file descriptor will belong to the this timeline.
	41	*
	42	* The 'sw_sync' file can be opened many times as to create different
	43	* timelines.
	44	*
	45	* Fences can be created with SW_SYNC_IOC_CREATE_FENCE ioctl with struct
	46	* sw_sync_ioctl_create_fence as parameter.
	47	*
	48	* To increment the timeline counter, SW_SYNC_IOC_INC ioctl should be used
	49	* with the increment as u32. This will update the last signaled value
	50	* from the timeline and signal any fence that has a seqno smaller or equal
	51	* to it.
	52	*
	53	* struct sw_sync_ioctl_create_fence
	54	* @value: the seqno to initialise the fence with
	55	* @name: the name of the new sync point
	56	* @fence: return the fd of the new sync_file with the created fence
	57	*/
6f65aa89 GP	58	struct sw_sync_create_fence_data {
	59	__u32 value;
	60	char name[32];
	61	__s32 fence; /* fd of new fence */
	62	};
	63
	64	#define SW_SYNC_IOC_MAGIC 'W'
	65
	66	#define SW_SYNC_IOC_CREATE_FENCE _IOWR(SW_SYNC_IOC_MAGIC, 0,\
	67	struct sw_sync_create_fence_data)
fc0c9a03	68
6f65aa89 GP	69	#define SW_SYNC_IOC_INC _IOW(SW_SYNC_IOC_MAGIC, 1, __u32)
6f65aa89 GP	70
f54d1867	71	static const struct dma_fence_ops timeline_fence_ops;
aff9da10	72
f54d1867	73	static inline struct sync_pt dma_fence_to_sync_pt(struct dma_fence fence)
aff9da10 GP	74	{
	75	if (fence->ops != &timeline_fence_ops)
	76	return NULL;
	77	return container_of(fence, struct sync_pt, base);
	78	}
	79
	80	/**
	81	* sync_timeline_create() - creates a sync object
aff9da10 GP	82	* @name: sync_timeline name
	83	*
	84	* Creates a new sync_timeline. Returns the sync_timeline object or NULL in
	85	* case of error.
	86	*/
74881588	87	static struct sync_timeline sync_timeline_create(const char name)
aff9da10 GP	88	{
	89	struct sync_timeline *obj;
	90
	91	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
	92	if (!obj)
	93	return NULL;
	94
	95	kref_init(&obj->kref);
f54d1867	96	obj->context = dma_fence_context_alloc(1);
aff9da10	97	strlcpy(obj->name, name, sizeof(obj->name));
aff9da10	98
f1e8c671	99	obj->pt_tree = RB_ROOT;
d3862e44 CW	100	INIT_LIST_HEAD(&obj->pt_list);
d3862e44 CW	101	spin_lock_init(&obj->lock);
aff9da10 GP	102
	103	sync_timeline_debug_add(obj);
	104
	105	return obj;
	106	}
	107
	108	static void sync_timeline_free(struct kref *kref)
	109	{
	110	struct sync_timeline *obj =
	111	container_of(kref, struct sync_timeline, kref);
	112
	113	sync_timeline_debug_remove(obj);
	114
	115	kfree(obj);
	116	}
	117
	118	static void sync_timeline_get(struct sync_timeline *obj)
	119	{
	120	kref_get(&obj->kref);
	121	}
	122
	123	static void sync_timeline_put(struct sync_timeline *obj)
	124	{
	125	kref_put(&obj->kref, sync_timeline_free);
	126	}
	127
150b6a9d GP	128	static const char timeline_fence_get_driver_name(struct dma_fence fence)
	129	{
	130	return "sw_sync";
	131	}
	132
	133	static const char timeline_fence_get_timeline_name(struct dma_fence fence)
	134	{
	135	struct sync_timeline *parent = dma_fence_parent(fence);
	136
	137	return parent->name;
	138	}
	139
	140	static void timeline_fence_release(struct dma_fence *fence)
	141	{
	142	struct sync_pt *pt = dma_fence_to_sync_pt(fence);
	143	struct sync_timeline *parent = dma_fence_parent(fence);
	144
	145	if (!list_empty(&pt->link)) {
	146	unsigned long flags;
	147
	148	spin_lock_irqsave(fence->lock, flags);
	149	if (!list_empty(&pt->link)) {
	150	list_del(&pt->link);
	151	rb_erase(&pt->node, &parent->pt_tree);
	152	}
	153	spin_unlock_irqrestore(fence->lock, flags);
	154	}
	155
	156	sync_timeline_put(parent);
	157	dma_fence_free(fence);
	158	}
	159
	160	static bool timeline_fence_signaled(struct dma_fence *fence)
	161	{
	162	struct sync_timeline *parent = dma_fence_parent(fence);
	163
	164	return !__dma_fence_is_later(fence->seqno, parent->value);
	165	}
	166
	167	static bool timeline_fence_enable_signaling(struct dma_fence *fence)
	168	{
	169	return true;
	170	}
	171
	172	static void timeline_fence_value_str(struct dma_fence *fence,
	173	char *str, int size)
	174	{
	175	snprintf(str, size, "%d", fence->seqno);
	176	}
	177
	178	static void timeline_fence_timeline_value_str(struct dma_fence *fence,
	179	char *str, int size)
	180	{
	181	struct sync_timeline *parent = dma_fence_parent(fence);
	182
	183	snprintf(str, size, "%d", parent->value);
	184	}
	185
	186	static const struct dma_fence_ops timeline_fence_ops = {
	187	.get_driver_name = timeline_fence_get_driver_name,
	188	.get_timeline_name = timeline_fence_get_timeline_name,
	189	.enable_signaling = timeline_fence_enable_signaling,
	190	.signaled = timeline_fence_signaled,
	191	.wait = dma_fence_default_wait,
192	.release = timeline_fence_release,
193	.fence_value_str = timeline_fence_value_str,
194	.timeline_value_str = timeline_fence_timeline_value_str,
195	};
196
aff9da10 GP	197	/**
	198	* sync_timeline_signal() - signal a status change on a sync_timeline
	199	* @obj: sync_timeline to signal
	200	* @inc: num to increment on timeline->value
	201	*
	202	* A sync implementation should call this any time one of it's fences
	203	* has signaled or has an error condition.
	204	*/
	205	static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc)
	206	{
aff9da10 GP	207	struct sync_pt pt, next;
	208
	209	trace_sync_timeline(obj);
	210
d3862e44	211	spin_lock_irq(&obj->lock);
aff9da10 GP	212
	213	obj->value += inc;
	214
f1e8c671	215	list_for_each_entry_safe(pt, next, &obj->pt_list, link) {
3792b7c1	216	if (!timeline_fence_signaled(&pt->base))
f1e8c671 CW	217	break;
	218
	219	list_del_init(&pt->link);
	220	rb_erase(&pt->node, &obj->pt_tree);
3792b7c1 GP	221
	222	/*
	223	* A signal callback may release the last reference to this
	224	* fence, causing it to be freed. That operation has to be
	225	* last to avoid a use after free inside this loop, and must
	226	* be after we remove the fence from the timeline in order to
	227	* prevent deadlocking on timeline->lock inside
	228	* timeline_fence_release().
	229	*/
	230	dma_fence_signal_locked(&pt->base);
f1e8c671	231	}
aff9da10	232
d3862e44	233	spin_unlock_irq(&obj->lock);
aff9da10 GP	234	}
	235
	236	/**
	237	* sync_pt_create() - creates a sync pt
	238	* @parent: fence's parent sync_timeline
aff9da10 GP	239	* @inc: value of the fence
	240	*
	241	* Creates a new sync_pt as a child of @parent. @size bytes will be
	242	* allocated allowing for implementation specific data to be kept after
	243	* the generic sync_timeline struct. Returns the sync_pt object or
	244	* NULL in case of error.
	245	*/
3b52ce44 CW	246	static struct sync_pt sync_pt_create(struct sync_timeline obj,
3b52ce44 CW	247	unsigned int value)
aff9da10	248	{
aff9da10 GP	249	struct sync_pt *pt;
aff9da10 GP	250
3b52ce44	251	pt = kzalloc(sizeof(*pt), GFP_KERNEL);
aff9da10 GP	252	if (!pt)
	253	return NULL;
	254
aff9da10	255	sync_timeline_get(obj);
d3862e44	256	dma_fence_init(&pt->base, &timeline_fence_ops, &obj->lock,
f54d1867	257	obj->context, value);
d3862e44	258	INIT_LIST_HEAD(&pt->link);
a6aa8fca	259
d3862e44	260	spin_lock_irq(&obj->lock);
f1e8c671 CW	261	if (!dma_fence_is_signaled_locked(&pt->base)) {
	262	struct rb_node **p = &obj->pt_tree.rb_node;
	263	struct rb_node *parent = NULL;
	264
	265	while (*p) {
	266	struct sync_pt *other;
	267	int cmp;
	268
	269	parent = *p;
	270	other = rb_entry(parent, typeof(*pt), node);
	271	cmp = value - other->base.seqno;
	272	if (cmp > 0) {
	273	p = &parent->rb_right;
	274	} else if (cmp < 0) {
	275	p = &parent->rb_left;
	276	} else {
	277	if (dma_fence_get_rcu(&other->base)) {
	278	dma_fence_put(&pt->base);
	279	pt = other;
	280	goto unlock;
	281	}
	282	p = &parent->rb_left;
	283	}
	284	}
	285	rb_link_node(&pt->node, parent, p);
	286	rb_insert_color(&pt->node, &obj->pt_tree);
	287
	288	parent = rb_next(&pt->node);
	289	list_add_tail(&pt->link,
	290	parent ? &rb_entry(parent, typeof(*pt), node)->link : &obj->pt_list);
	291	}
	292	unlock:
d3862e44	293	spin_unlock_irq(&obj->lock);
a6aa8fca	294
aff9da10 GP	295	return pt;
	296	}
	297
1867a23b GP	298	/*
	299	* WARNING
	300	*
	301	* improper use of this can result in deadlocking kernel drivers from userspace.
	302	*/
	303
	304	/* opening sw_sync create a new sync obj */
	305	static int sw_sync_debugfs_open(struct inode inode, struct file file)
	306	{
	307	struct sync_timeline *obj;
	308	char task_comm[TASK_COMM_LEN];
	309
	310	get_task_comm(task_comm, current);
	311
b9bc2b7b	312	obj = sync_timeline_create(task_comm);
1867a23b GP	313	if (!obj)
	314	return -ENOMEM;
	315
	316	file->private_data = obj;
	317
	318	return 0;
	319	}
	320
	321	static int sw_sync_debugfs_release(struct inode inode, struct file file)
	322	{
	323	struct sync_timeline *obj = file->private_data;
ea4d5a27 DB	324	struct sync_pt pt, next;
	325
	326	spin_lock_irq(&obj->lock);
	327
	328	list_for_each_entry_safe(pt, next, &obj->pt_list, link) {
	329	dma_fence_set_error(&pt->base, -ENOENT);
	330	dma_fence_signal_locked(&pt->base);
	331	}
1867a23b	332
ea4d5a27	333	spin_unlock_irq(&obj->lock);
71110232 GP	334
71110232 GP	335	sync_timeline_put(obj);
1867a23b GP	336	return 0;
	337	}
	338
	339	static long sw_sync_ioctl_create_fence(struct sync_timeline *obj,
	340	unsigned long arg)
	341	{
	342	int fd = get_unused_fd_flags(O_CLOEXEC);
	343	int err;
	344	struct sync_pt *pt;
	345	struct sync_file *sync_file;
	346	struct sw_sync_create_fence_data data;
	347
	348	if (fd < 0)
	349	return fd;
	350
	351	if (copy_from_user(&data, (void __user *)arg, sizeof(data))) {
	352	err = -EFAULT;
	353	goto err;
	354	}
	355
3b52ce44	356	pt = sync_pt_create(obj, data.value);
1867a23b GP	357	if (!pt) {
	358	err = -ENOMEM;
	359	goto err;
	360	}
	361
	362	sync_file = sync_file_create(&pt->base);
4592bfcd	363	dma_fence_put(&pt->base);
1867a23b	364	if (!sync_file) {
1867a23b GP	365	err = -ENOMEM;
	366	goto err;
	367	}
	368
	369	data.fence = fd;
	370	if (copy_to_user((void __user *)arg, &data, sizeof(data))) {
	371	fput(sync_file->file);
	372	err = -EFAULT;
	373	goto err;
	374	}
	375
	376	fd_install(fd, sync_file->file);
	377
	378	return 0;
	379
	380	err:
	381	put_unused_fd(fd);
	382	return err;
	383	}
	384
	385	static long sw_sync_ioctl_inc(struct sync_timeline *obj, unsigned long arg)
	386	{
	387	u32 value;
	388
	389	if (copy_from_user(&value, (void __user *)arg, sizeof(value)))
	390	return -EFAULT;
	391
8f66d3aa CW	392	while (value > INT_MAX) {
	393	sync_timeline_signal(obj, INT_MAX);
	394	value -= INT_MAX;
	395	}
	396
1867a23b GP	397	sync_timeline_signal(obj, value);
	398
	399	return 0;
	400	}
	401
	402	static long sw_sync_ioctl(struct file *file, unsigned int cmd,
	403	unsigned long arg)
	404	{
	405	struct sync_timeline *obj = file->private_data;
	406
	407	switch (cmd) {
	408	case SW_SYNC_IOC_CREATE_FENCE:
	409	return sw_sync_ioctl_create_fence(obj, arg);
	410
	411	case SW_SYNC_IOC_INC:
	412	return sw_sync_ioctl_inc(obj, arg);
	413
	414	default:
	415	return -ENOTTY;
	416	}
	417	}
	418
	419	const struct file_operations sw_sync_debugfs_fops = {
	420	.open = sw_sync_debugfs_open,
	421	.release = sw_sync_debugfs_release,
	422	.unlocked_ioctl = sw_sync_ioctl,
	423	.compat_ioctl = sw_sync_ioctl,
	424	};