diff options
| -rw-r--r-- | drivers/char/virtio_console.c | 77 | ||||
| -rw-r--r-- | include/linux/virtio_console.h | 17 |
2 files changed, 41 insertions, 53 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 237eee2..7671914 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -1048,7 +1048,7 @@ static void handle_control_message(struct ports_device *portdev, cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); port = find_port_by_id(portdev, cpkt->id); - if (!port) { + if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) { /* No valid header at start of buffer. Drop it. */ dev_dbg(&portdev->vdev->dev, "Invalid index %u in control packet\n", cpkt->id); @@ -1056,6 +1056,30 @@ static void handle_control_message(struct ports_device *portdev, } switch (cpkt->event) { + case VIRTIO_CONSOLE_PORT_ADD: + if (port) { + /* + * This can happen for port 0: we have to + * create a console port during probe() as was + * the behaviour before the MULTIPORT feature. + * On a newer host, when the host tells us + * that a port 0 is available, we should just + * say we have the port all set up. + */ + send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); + break; + } + if (cpkt->id >= portdev->config.max_nr_ports) { + dev_warn(&portdev->vdev->dev, + "Request for adding port with out-of-bound id %u, max. supported id: %u\n", + cpkt->id, portdev->config.max_nr_ports - 1); + break; + } + add_port(portdev, cpkt->id); + break; + case VIRTIO_CONSOLE_PORT_REMOVE: + remove_port(port); + break; case VIRTIO_CONSOLE_CONSOLE_PORT: if (!cpkt->value) break; @@ -1114,32 +1138,6 @@ static void handle_control_message(struct ports_device *portdev, kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); } break; - case VIRTIO_CONSOLE_PORT_REMOVE: - /* - * Hot unplug the port. We don't decrement nr_ports - * since we don't want to deal with extra complexities - * of using the lowest-available port id: We can just - * pick up the nr_ports number as the id and not have - * userspace send it to us. This helps us in two - * ways: - * - * - We don't need to have a 'port_id' field in the - * config space when a port is hot-added. This is a - * good thing as we might queue up multiple hotplug - * requests issued in our workqueue. - * - * - Another way to deal with this would have been to - * use a bitmap of the active ports and select the - * lowest non-active port from that map. That - * bloats the already tight config space and we - * would end up artificially limiting the - * max. number of ports to sizeof(bitmap). Right - * now we can support 2^32 ports (as the port id is - * stored in a u32 type). - * - */ - remove_port(port); - break; } } @@ -1347,7 +1345,6 @@ static const struct file_operations portdev_fops = { static int __devinit virtcons_probe(struct virtio_device *vdev) { struct ports_device *portdev; - u32 i; int err; bool multiport; @@ -1376,29 +1373,15 @@ static int __devinit virtcons_probe(struct virtio_device *vdev) } multiport = false; - portdev->config.nr_ports = 1; portdev->config.max_nr_ports = 1; if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { multiport = true; vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; vdev->config->get(vdev, offsetof(struct virtio_console_config, - nr_ports), - &portdev->config.nr_ports, - sizeof(portdev->config.nr_ports)); - vdev->config->get(vdev, offsetof(struct virtio_console_config, max_nr_ports), &portdev->config.max_nr_ports, sizeof(portdev->config.max_nr_ports)); - if (portdev->config.nr_ports > portdev->config.max_nr_ports) { - dev_warn(&vdev->dev, - "More ports (%u) specified than allowed (%u). Will init %u ports.", - portdev->config.nr_ports, - portdev->config.max_nr_ports, - portdev->config.max_nr_ports); - - portdev->config.nr_ports = portdev->config.max_nr_ports; - } } /* Let the Host know we support multiple ports.*/ @@ -1428,11 +1411,17 @@ static int __devinit virtcons_probe(struct virtio_device *vdev) } } - for (i = 0; i < portdev->config.nr_ports; i++) - add_port(portdev, i); + /* + * For backward compatibility: if we're running on an older + * host, we always want to create a console port. + */ + add_port(portdev, 0); /* Start using the new console output. */ early_put_chars = NULL; + + __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, + VIRTIO_CONSOLE_DEVICE_READY, 1); return 0; free_vqs: diff --git a/include/linux/virtio_console.h b/include/linux/virtio_console.h index 0157361..a85064d 100644 --- a/include/linux/virtio_console.h +++ b/include/linux/virtio_console.h @@ -23,8 +23,6 @@ struct virtio_console_config { __u16 rows; /* max. number of ports this device can hold */ __u32 max_nr_ports; - /* number of ports added so far */ - __u32 nr_ports; } __attribute__((packed)); /* @@ -38,13 +36,14 @@ struct virtio_console_control { }; /* Some events for control messages */ -#define VIRTIO_CONSOLE_PORT_READY 0 -#define VIRTIO_CONSOLE_CONSOLE_PORT 1 -#define VIRTIO_CONSOLE_RESIZE 2 -#define VIRTIO_CONSOLE_PORT_OPEN 3 -#define VIRTIO_CONSOLE_PORT_NAME 4 -#define VIRTIO_CONSOLE_PORT_REMOVE 5 -#define VIRTIO_CONSOLE_DEVICE_READY 6 +#define VIRTIO_CONSOLE_DEVICE_READY 0 +#define VIRTIO_CONSOLE_PORT_ADD 1 +#define VIRTIO_CONSOLE_PORT_REMOVE 2 +#define VIRTIO_CONSOLE_PORT_READY 3 +#define VIRTIO_CONSOLE_CONSOLE_PORT 4 +#define VIRTIO_CONSOLE_RESIZE 5 +#define VIRTIO_CONSOLE_PORT_OPEN 6 +#define VIRTIO_CONSOLE_PORT_NAME 7 #ifdef __KERNEL__ int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)); |