int
drm_read(struct dev_read_args *ap)
{
struct cdev *kdev = ap->a_head.a_dev;
struct uio *uio = ap->a_uio;
int ioflag = ap->a_ioflag;
struct drm_file *file_priv;
struct drm_device *dev;
struct drm_pending_event *e;
int error;
error = devfs_get_cdevpriv(ap->a_fp, (void **)&file_priv);
if (error != 0) {
DRM_ERROR("can't find authenticator\n");
return (EINVAL);
}
dev = drm_get_device_from_kdev(kdev);
lockmgr(&dev->event_lock, LK_EXCLUSIVE);
while (list_empty(&file_priv->event_list)) {
if ((ioflag & O_NONBLOCK) != 0) {
error = EAGAIN;
goto out;
}
error = lksleep(&file_priv->event_space, &dev->event_lock,
PCATCH, "drmrea", 0);
if (error != 0)
goto out;
}
while (drm_dequeue_event(dev, file_priv, uio, &e)) {
lockmgr(&dev->event_lock, LK_RELEASE);
error = uiomove((caddr_t)e->event, e->event->length, uio);
e->destroy(e);
if (error != 0)
return (error);
lockmgr(&dev->event_lock, LK_EXCLUSIVE);
}
out:
lockmgr(&dev->event_lock, LK_RELEASE);
return (error);
}
int
drm_read(struct cdev *kdev, struct uio *uio, int ioflag)
{
struct drm_file *file_priv;
struct drm_device *dev;
struct drm_pending_event *e;
int error;
error = devfs_get_cdevpriv((void **)&file_priv);
if (error != 0) {
DRM_ERROR("can't find authenticator\n");
return (EINVAL);
}
dev = drm_get_device_from_kdev(kdev);
mtx_lock(&dev->event_lock);
while (list_empty(&file_priv->event_list)) {
if ((ioflag & O_NONBLOCK) != 0) {
error = EAGAIN;
goto out;
}
error = msleep(&file_priv->event_space, &dev->event_lock,
PCATCH, "drmrea", 0);
if (error != 0)
goto out;
}
while (drm_dequeue_event(dev, file_priv, uio, &e)) {
mtx_unlock(&dev->event_lock);
error = uiomove(e->event, e->event->length, uio);
CTR3(KTR_DRM, "drm_event_dequeued %d %d %d", curproc->p_pid,
e->event->type, e->event->length);
e->destroy(e);
if (error != 0)
return (error);
mtx_lock(&dev->event_lock);
}
out:
mtx_unlock(&dev->event_lock);
return (error);
}
