diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/char/virtio_console.c | 81 |
2 files changed, 82 insertions, 7 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index e023682be2c..3141dd3b6e5 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -666,6 +666,14 @@ config VIRTIO_CONSOLE help Virtio console for use with lguest and other hypervisors. + Also serves as a general-purpose serial device for data + transfer between the guest and host. Character devices at + /dev/vportNpn will be created when corresponding ports are + found, where N is the device number and n is the port number + within that device. If specified by the host, a sysfs + attribute called 'name' will be populated with a name for + the port which can be used by udev scripts to create a + symlink to the device. config HVCS tristate "IBM Hypervisor Virtual Console Server support" diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 8e447e1e12b..64ef476d655 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -16,6 +16,8 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +#include <linux/cdev.h> +#include <linux/device.h> #include <linux/err.h> #include <linux/init.h> #include <linux/list.h> @@ -34,6 +36,12 @@ * across multiple devices and multiple ports per device. */ struct ports_driver_data { + /* Used for registering chardevs */ + struct class *class; + + /* Number of devices this driver is handling */ + unsigned int index; + /* * This is used to keep track of the number of hvc consoles * spawned by this driver. This number is given as the first @@ -116,6 +124,12 @@ struct ports_device { /* Array of per-port IO virtqueues */ struct virtqueue **in_vqs, **out_vqs; + + /* Used for numbering devices for sysfs and debugfs */ + unsigned int drv_index; + + /* Major number for this device. Ports will be created as minors. */ + int chr_major; }; /* This struct holds the per-port data */ @@ -145,6 +159,10 @@ struct port { */ struct console cons; + /* Each port associates with a separate char device */ + struct cdev cdev; + struct device *dev; + /* The 'id' to identify the port with the Host */ u32 id; }; @@ -391,7 +409,7 @@ static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, port->inbuf = NULL; if (add_inbuf(port->in_vq, buf) < 0) - dev_warn(&port->portdev->vdev->dev, "failed add_buf\n"); + dev_warn(port->dev, "failed add_buf\n"); spin_unlock_irqrestore(&port->inbuf_lock, flags); } @@ -664,6 +682,7 @@ static int add_port(struct ports_device *portdev, u32 id) { struct port *port; struct port_buffer *inbuf; + dev_t devt; int err; port = kmalloc(sizeof(*port), GFP_KERNEL); @@ -681,12 +700,32 @@ static int add_port(struct ports_device *portdev, u32 id) port->in_vq = portdev->in_vqs[port->id]; port->out_vq = portdev->out_vqs[port->id]; + cdev_init(&port->cdev, NULL); + + devt = MKDEV(portdev->chr_major, id); + err = cdev_add(&port->cdev, devt, 1); + if (err < 0) { + dev_err(&port->portdev->vdev->dev, + "Error %d adding cdev for port %u\n", err, id); + goto free_port; + } + port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, + devt, port, "vport%up%u", + port->portdev->drv_index, id); + if (IS_ERR(port->dev)) { + err = PTR_ERR(port->dev); + dev_err(&port->portdev->vdev->dev, + "Error %d creating device for port %u\n", + err, id); + goto free_cdev; + } + spin_lock_init(&port->inbuf_lock); inbuf = alloc_buf(PAGE_SIZE); if (!inbuf) { err = -ENOMEM; - goto free_port; + goto free_device; } /* Register the input buffer the first time. */ @@ -716,6 +755,10 @@ static int add_port(struct ports_device *portdev, u32 id) free_inbuf: free_buf(inbuf); +free_device: + device_destroy(pdrvdata.class, port->dev->devt); +free_cdev: + cdev_del(&port->cdev); free_port: kfree(port); fail: @@ -828,6 +871,10 @@ fail: return err; } +static const struct file_operations portdev_fops = { + .owner = THIS_MODULE, +}; + /* * Once we're further in boot, we get probed like any other virtio * device. @@ -853,6 +900,20 @@ static int __devinit virtcons_probe(struct virtio_device *vdev) portdev->vdev = vdev; vdev->priv = portdev; + spin_lock_irq(&pdrvdata_lock); + portdev->drv_index = pdrvdata.index++; + spin_unlock_irq(&pdrvdata_lock); + + portdev->chr_major = register_chrdev(0, "virtio-portsdev", + &portdev_fops); + if (portdev->chr_major < 0) { + dev_err(&vdev->dev, + "Error %d registering chrdev for device %u\n", + portdev->chr_major, portdev->drv_index); + err = portdev->chr_major; + goto free; + } + multiport = false; portdev->config.nr_ports = 1; portdev->config.max_nr_ports = 1; @@ -885,7 +946,7 @@ static int __devinit virtcons_probe(struct virtio_device *vdev) err = init_vqs(portdev); if (err < 0) { dev_err(&vdev->dev, "Error %d initializing vqs\n", err); - goto free; + goto free_chrdev; } spin_lock_init(&portdev->ports_lock); @@ -905,10 +966,8 @@ static int __devinit virtcons_probe(struct virtio_device *vdev) early_put_chars = NULL; return 0; -free_vqs: - vdev->config->del_vqs(vdev); - kfree(portdev->in_vqs); - kfree(portdev->out_vqs); +free_chrdev: + unregister_chrdev(portdev->chr_major, "virtio-portsdev"); free: kfree(portdev); fail: @@ -937,6 +996,14 @@ static struct virtio_driver virtio_console = { static int __init init(void) { + int err; + + pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); + if (IS_ERR(pdrvdata.class)) { + err = PTR_ERR(pdrvdata.class); + pr_err("Error %d creating virtio-ports class\n", err); + return err; + } INIT_LIST_HEAD(&pdrvdata.consoles); return register_virtio_driver(&virtio_console); |