[PATCH v3 10/30] ntsync: Introduce NTSYNC_IOC_EVENT_SET.
From: Elizabeth Figura <zfigura@codeweavers.com>
Date: 2024-03-29 00:23:47
Also in:
linux-doc, linux-kselftest, lkml
Subsystem:
char and misc drivers, ntsync synchronization primitive driver, the rest · Maintainers:
Arnd Bergmann, Greg Kroah-Hartman, Elizabeth Figura, Linus Torvalds
This corresponds to the NT syscall NtSetEvent(). This sets the event to the signaled state, and returns its previous state. Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com> --- drivers/misc/ntsync.c | 37 +++++++++++++++++++++++++++++++++++++ include/uapi/linux/ntsync.h | 1 + 2 files changed, 38 insertions(+)
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
index 3e125c805c00..69f359241cf6 100644
--- a/drivers/misc/ntsync.c
+++ b/drivers/misc/ntsync.c@@ -473,6 +473,41 @@ static int ntsync_mutex_kill(struct ntsync_obj *mutex, void __user *argp) return ret; } +static int ntsync_event_set(struct ntsync_obj *event, void __user *argp) +{ + struct ntsync_device *dev = event->dev; + __u32 prev_state; + + if (event->type != NTSYNC_TYPE_EVENT) + return -EINVAL; + + if (atomic_read(&event->all_hint) > 0) { + spin_lock(&dev->wait_all_lock); + spin_lock_nest_lock(&event->lock, &dev->wait_all_lock); + + prev_state = event->u.event.signaled; + event->u.event.signaled = true; + try_wake_all_obj(dev, event); + try_wake_any_event(event); + + spin_unlock(&event->lock); + spin_unlock(&dev->wait_all_lock); + } else { + spin_lock(&event->lock); + + prev_state = event->u.event.signaled; + event->u.event.signaled = true; + try_wake_any_event(event); + + spin_unlock(&event->lock); + } + + if (put_user(prev_state, (__u32 __user *)argp)) + return -EFAULT; + + return 0; +} + static int ntsync_obj_release(struct inode *inode, struct file *file) { struct ntsync_obj *obj = file->private_data;
@@ -496,6 +531,8 @@ static long ntsync_obj_ioctl(struct file *file, unsigned int cmd, return ntsync_mutex_unlock(obj, argp); case NTSYNC_IOC_MUTEX_KILL: return ntsync_mutex_kill(obj, argp); + case NTSYNC_IOC_EVENT_SET: + return ntsync_event_set(obj, argp); default: return -ENOIOCTLCMD; }
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
index 0d133f2eaf0b..65329d15a472 100644
--- a/include/uapi/linux/ntsync.h
+++ b/include/uapi/linux/ntsync.h@@ -52,5 +52,6 @@ struct ntsync_wait_args { #define NTSYNC_IOC_SEM_POST _IOWR('N', 0x81, __u32) #define NTSYNC_IOC_MUTEX_UNLOCK _IOWR('N', 0x85, struct ntsync_mutex_args) #define NTSYNC_IOC_MUTEX_KILL _IOW ('N', 0x86, __u32) +#define NTSYNC_IOC_EVENT_SET _IOR ('N', 0x88, __u32) #endif
--
2.43.0