This correspond to the NT syscall NtCreateEvent().

An NT event holds a single bit of state denoting whether it is signaled or
unsignaled.

There are two types of events: manual-reset and automatic-reset. When an
automatic-reset event is acquired via a wait function, its state is reset to
unsignaled. Manual-reset events are not affected by wait functions.

Whether the event is manual-reset, and its initial state, are specified at
creation time.

Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
---
 drivers/misc/ntsync.c       | 60 +++++++++++++++++++++++++++++++++++++
 include/uapi/linux/ntsync.h |  7 +++++
 2 files changed, 67 insertions(+)

diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
index a3466be50c45..17dd47d06e0a 100644
--- a/drivers/misc/ntsync.c
+++ b/drivers/misc/ntsync.c
@@ -25,6 +25,7 @@
 enum ntsync_type {
 	NTSYNC_TYPE_SEM,
 	NTSYNC_TYPE_MUTEX,
+	NTSYNC_TYPE_EVENT,
 };
 
 /*
@@ -59,6 +60,10 @@ struct ntsync_obj {
 			__u32 owner;
 			bool ownerdead;
 		} mutex;
+		struct {
+			bool manual;
+			bool signaled;
+		} event;
 	} u;
 
 	/*
@@ -143,6 +148,8 @@ static bool is_signaled(struct ntsync_obj *obj, __u32 owner)
 		if (obj->u.mutex.owner && obj->u.mutex.owner != owner)
 			return false;
 		return obj->u.mutex.count < UINT_MAX;
+	case NTSYNC_TYPE_EVENT:
+		return obj->u.event.signaled;
 	}
 
 	WARN(1, "bad object type %#x\n", obj->type);
@@ -192,6 +199,10 @@ static void try_wake_all(struct ntsync_device *dev, struct ntsync_q *q,
 				obj->u.mutex.count++;
 				obj->u.mutex.owner = q->owner;
 				break;
+			case NTSYNC_TYPE_EVENT:
+				if (!obj->u.event.manual)
+					obj->u.event.signaled = false;
+				break;
 			}
 		}
 		wake_up_process(q->task);
@@ -258,6 +269,26 @@ static void try_wake_any_mutex(struct ntsync_obj *mutex)
 	}
 }
 
+static void try_wake_any_event(struct ntsync_obj *event)
+{
+	struct ntsync_q_entry *entry;
+
+	lockdep_assert_held(&event->lock);
+
+	list_for_each_entry(entry, &event->any_waiters, node) {
+		struct ntsync_q *q = entry->q;
+
+		if (!event->u.event.signaled)
+			break;
+
+		if (atomic_cmpxchg(&q->signaled, -1, entry->index) == -1) {
+			if (!event->u.event.manual)
+				event->u.event.signaled = false;
+			wake_up_process(q->task);
+		}
+	}
+}
+
 /*
  * Actually change the semaphore state, returning -EOVERFLOW if it is made
  * invalid.
@@ -566,6 +597,30 @@ static int ntsync_create_mutex(struct ntsync_device *dev, void __user *argp)
 	return put_user(fd, &user_args->mutex);
 }
 
+static int ntsync_create_event(struct ntsync_device *dev, void __user *argp)
+{
+	struct ntsync_event_args __user *user_args = argp;
+	struct ntsync_event_args args;
+	struct ntsync_obj *event;
+	int fd;
+
+	if (copy_from_user(&args, argp, sizeof(args)))
+		return -EFAULT;
+
+	event = ntsync_alloc_obj(dev, NTSYNC_TYPE_EVENT);
+	if (!event)
+		return -ENOMEM;
+	event->u.event.manual = args.manual;
+	event->u.event.signaled = args.signaled;
+	fd = ntsync_obj_get_fd(event);
+	if (fd < 0) {
+		kfree(event);
+		return fd;
+	}
+
+	return put_user(fd, &user_args->event);
+}
+
 static struct ntsync_obj *get_obj(struct ntsync_device *dev, int fd)
 {
 	struct file *file = fget(fd);
@@ -689,6 +744,9 @@ static void try_wake_any_obj(struct ntsync_obj *obj)
 	case NTSYNC_TYPE_MUTEX:
 		try_wake_any_mutex(obj);
 		break;
+	case NTSYNC_TYPE_EVENT:
+		try_wake_any_event(obj);
+		break;
 	}
 }
 
@@ -877,6 +935,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
 	void __user *argp = (void __user *)parm;
 
 	switch (cmd) {
+	case NTSYNC_IOC_CREATE_EVENT:
+		return ntsync_create_event(dev, argp);
 	case NTSYNC_IOC_CREATE_MUTEX:
 		return ntsync_create_mutex(dev, argp);
 	case NTSYNC_IOC_CREATE_SEM:
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
index 4800941fcbda..040cbdb39033 100644
--- a/include/uapi/linux/ntsync.h
+++ b/include/uapi/linux/ntsync.h
@@ -22,6 +22,12 @@ struct ntsync_mutex_args {
 	__u32 count;
 };
 
+struct ntsync_event_args {
+	__u32 event;
+	__u32 manual;
+	__u32 signaled;
+};
+
 struct ntsync_wait_args {
 	__u64 timeout;
 	__u64 objs;
@@ -37,6 +43,7 @@ struct ntsync_wait_args {
 #define NTSYNC_IOC_WAIT_ANY		_IOWR('N', 0x82, struct ntsync_wait_args)
 #define NTSYNC_IOC_WAIT_ALL		_IOWR('N', 0x83, struct ntsync_wait_args)
 #define NTSYNC_IOC_CREATE_MUTEX		_IOWR('N', 0x84, struct ntsync_sem_args)
+#define NTSYNC_IOC_CREATE_EVENT		_IOWR('N', 0x87, struct ntsync_event_args)
 
 #define NTSYNC_IOC_SEM_POST		_IOWR('N', 0x81, __u32)
 #define NTSYNC_IOC_MUTEX_UNLOCK		_IOWR('N', 0x85, struct ntsync_mutex_args)
-- 
2.43.0
