drivers/vfio/device_cdev.c

12 void vfio_init_device_cdev(struct vfio_device *device)
14 	device->device.devt = MKDEV(MAJOR(device_devt), device->index);
15 	cdev_init(&device->cdev, &vfio_device_fops);
16 	device->cdev.owner = THIS_MODULE;
20  * device access via the fd opened by this function is blocked until
25 	struct vfio_device *device = container_of(inode->i_cdev,
31 	if (!vfio_device_try_get_registration(device))
34 	df = vfio_allocate_device_file(device);
43 	 * Use the pseudo fs inode on the device to link all mmaps
45 	 * associated to this device using unmap_mapping_range().
47 	filep->f_mapping = device->inode->i_mapping;
52 	vfio_device_put_registration(device);
59 	vfio_device_get_kvm_safe(df->device, df->kvm);
66 	struct vfio_device *device = df->device;
85 	ret = vfio_device_block_group(device);
89 	mutex_lock(&device->dev_set->lock);
90 	/* one device cannot be bound twice */
104 	 * Before the device open, get the KVM pointer currently
105 	 * associated with the device file (if there is) and obtain
106 	 * a reference.  This reference is held until device closed.
107 	 * Save the pointer in the device for use by drivers.
120 	device->cdev_opened = true;
126 	mutex_unlock(&device->dev_set->lock);
132 	vfio_device_put_kvm(device);
136 	mutex_unlock(&device->dev_set->lock);
137 	vfio_device_unblock_group(device);
143 	struct vfio_device *device = df->device;
153 	mutex_lock(&device->dev_set->lock);
155 	vfio_device_put_kvm(device);
157 	device->cdev_opened = false;
158 	mutex_unlock(&device->dev_set->lock);
159 	vfio_device_unblock_group(device);
165 	struct vfio_device *device = df->device;
178 	mutex_lock(&device->dev_set->lock);
179 	ret = device->ops->attach_ioas(device, &attach.pt_id);
187 	mutex_unlock(&device->dev_set->lock);
192 	device->ops->detach_ioas(device);
194 	mutex_unlock(&device->dev_set->lock);
201 	struct vfio_device *device = df->device;
213 	mutex_lock(&device->dev_set->lock);
214 	device->ops->detach_ioas(device);
215 	mutex_unlock(&device->dev_set->lock);
220 static char *vfio_device_devnode(const struct device *dev, umode_t *mode)