2 * Copyright (C) 2006, 2007, 2009 Rusty Russell, IBM Corporation
3 * Copyright (C) 2009, 2010 Red Hat, Inc.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/cdev.h>
20 #include <linux/device.h>
21 #include <linux/err.h>
23 #include <linux/init.h>
24 #include <linux/list.h>
25 #include <linux/poll.h>
26 #include <linux/sched.h>
27 #include <linux/spinlock.h>
28 #include <linux/virtio.h>
29 #include <linux/virtio_console.h>
30 #include <linux/wait.h>
31 #include <linux/workqueue.h>
32 #include "hvc_console.h"
35 * This is a global struct for storing common data for all the devices
36 * this driver handles.
38 * Mainly, it has a linked list for all the consoles in one place so
39 * that callbacks from hvc for get_chars(), put_chars() work properly
40 * across multiple devices and multiple ports per device.
42 struct ports_driver_data {
43 /* Used for registering chardevs */
46 /* Number of devices this driver is handling */
50 * This is used to keep track of the number of hvc consoles
51 * spawned by this driver. This number is given as the first
52 * argument to hvc_alloc(). To correctly map an initial
53 * console spawned via hvc_instantiate to the console being
54 * hooked up via hvc_alloc, we need to pass the same vtermno.
56 * We also just assume the first console being initialised was
57 * the first one that got used as the initial console.
59 unsigned int next_vtermno;
61 /* All the console devices handled by this driver */
62 struct list_head consoles;
64 static struct ports_driver_data pdrvdata;
66 DEFINE_SPINLOCK(pdrvdata_lock);
68 /* This struct holds information that's relevant only for console ports */
70 /* We'll place all consoles in a list in the pdrvdata struct */
71 struct list_head list;
73 /* The hvc device associated with this console port */
74 struct hvc_struct *hvc;
77 * This number identifies the number that we used to register
78 * with hvc in hvc_instantiate() and hvc_alloc(); this is the
79 * number passed on by the hvc callbacks to us to
80 * differentiate between the other console ports handled by
89 /* size of the buffer in *buf above */
92 /* used length of the buffer */
94 /* offset in the buf from which to consume data */
99 * This is a per-device struct that stores data common to all the
100 * ports for that device (vdev->priv).
102 struct ports_device {
104 * Workqueue handlers where we process deferred work after
107 struct work_struct control_work;
109 struct list_head ports;
111 /* To protect the list of ports */
112 spinlock_t ports_lock;
114 /* To protect the vq operations for the control channel */
117 /* The current config space is stored here */
118 struct virtio_console_config config;
120 /* The virtio device we're associated with */
121 struct virtio_device *vdev;
124 * A couple of virtqueues for the control channel: one for
125 * guest->host transfers, one for host->guest transfers
127 struct virtqueue *c_ivq, *c_ovq;
129 /* Array of per-port IO virtqueues */
130 struct virtqueue **in_vqs, **out_vqs;
132 /* Used for numbering devices for sysfs and debugfs */
133 unsigned int drv_index;
135 /* Major number for this device. Ports will be created as minors. */
139 /* This struct holds the per-port data */
141 /* Next port in the list, head is in the ports_device */
142 struct list_head list;
144 /* Pointer to the parent virtio_console device */
145 struct ports_device *portdev;
147 /* The current buffer from which data has to be fed to readers */
148 struct port_buffer *inbuf;
151 * To protect the operations on the in_vq associated with this
152 * port. Has to be a spinlock because it can be called from
153 * interrupt context (get_char()).
155 spinlock_t inbuf_lock;
157 /* The IO vqs for this port */
158 struct virtqueue *in_vq, *out_vq;
161 * The entries in this struct will be valid if this port is
162 * hooked up to an hvc console
166 /* Each port associates with a separate char device */
170 /* A waitqueue for poll() or blocking read operations */
171 wait_queue_head_t waitqueue;
173 /* The 'id' to identify the port with the Host */
176 /* Is the host device open */
179 /* We should allow only one process to open a port */
180 bool guest_connected;
183 /* This is the very early arch-specified put chars function. */
184 static int (*early_put_chars)(u32, const char *, int);
186 static struct port *find_port_by_vtermno(u32 vtermno)
189 struct console *cons;
192 spin_lock_irqsave(&pdrvdata_lock, flags);
193 list_for_each_entry(cons, &pdrvdata.consoles, list) {
194 if (cons->vtermno == vtermno) {
195 port = container_of(cons, struct port, cons);
201 spin_unlock_irqrestore(&pdrvdata_lock, flags);
205 static struct port *find_port_by_id(struct ports_device *portdev, u32 id)
210 spin_lock_irqsave(&portdev->ports_lock, flags);
211 list_for_each_entry(port, &portdev->ports, list)
216 spin_unlock_irqrestore(&portdev->ports_lock, flags);
221 static struct port *find_port_by_vq(struct ports_device *portdev,
222 struct virtqueue *vq)
227 spin_lock_irqsave(&portdev->ports_lock, flags);
228 list_for_each_entry(port, &portdev->ports, list)
229 if (port->in_vq == vq || port->out_vq == vq)
233 spin_unlock_irqrestore(&portdev->ports_lock, flags);
237 static bool is_console_port(struct port *port)
244 static inline bool use_multiport(struct ports_device *portdev)
247 * This condition can be true when put_chars is called from
252 return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
255 static void free_buf(struct port_buffer *buf)
261 static struct port_buffer *alloc_buf(size_t buf_size)
263 struct port_buffer *buf;
265 buf = kmalloc(sizeof(*buf), GFP_KERNEL);
268 buf->buf = kzalloc(buf_size, GFP_KERNEL);
273 buf->size = buf_size;
282 /* Callers should take appropriate locks */
283 static void *get_inbuf(struct port *port)
285 struct port_buffer *buf;
286 struct virtqueue *vq;
290 buf = vq->vq_ops->get_buf(vq, &len);
299 * Create a scatter-gather list representing our input buffer and put
302 * Callers should take appropriate locks.
304 static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf)
306 struct scatterlist sg[1];
309 sg_init_one(sg, buf->buf, buf->size);
311 ret = vq->vq_ops->add_buf(vq, sg, 0, 1, buf);
312 vq->vq_ops->kick(vq);
316 static bool port_has_data(struct port *port)
322 spin_lock_irqsave(&port->inbuf_lock, flags);
325 spin_unlock_irqrestore(&port->inbuf_lock, flags);
330 static ssize_t send_control_msg(struct port *port, unsigned int event,
333 struct scatterlist sg[1];
334 struct virtio_console_control cpkt;
335 struct virtqueue *vq;
338 if (!use_multiport(port->portdev))
345 vq = port->portdev->c_ovq;
347 sg_init_one(sg, &cpkt, sizeof(cpkt));
348 if (vq->vq_ops->add_buf(vq, sg, 1, 0, &cpkt) >= 0) {
349 vq->vq_ops->kick(vq);
350 while (!vq->vq_ops->get_buf(vq, &len))
356 static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count)
358 struct scatterlist sg[1];
359 struct virtqueue *out_vq;
363 out_vq = port->out_vq;
365 sg_init_one(sg, in_buf, in_count);
366 ret = out_vq->vq_ops->add_buf(out_vq, sg, 1, 0, in_buf);
368 /* Tell Host to go! */
369 out_vq->vq_ops->kick(out_vq);
377 * Wait till the host acknowledges it pushed out the data we
378 * sent. Also ensure we return to userspace the number of
379 * bytes that were successfully consumed by the host.
381 while (!out_vq->vq_ops->get_buf(out_vq, &len))
384 /* We're expected to return the amount of data we wrote */
389 * Give out the data that's requested from the buffer that we have
392 static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count,
395 struct port_buffer *buf;
398 if (!out_count || !port_has_data(port))
402 out_count = min(out_count, buf->len - buf->offset);
407 ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count);
411 memcpy(out_buf, buf->buf + buf->offset, out_count);
414 buf->offset += out_count;
416 if (buf->offset == buf->len) {
418 * We're done using all the data in this buffer.
419 * Re-queue so that the Host can send us more data.
421 spin_lock_irqsave(&port->inbuf_lock, flags);
424 if (add_inbuf(port->in_vq, buf) < 0)
425 dev_warn(port->dev, "failed add_buf\n");
427 spin_unlock_irqrestore(&port->inbuf_lock, flags);
429 /* Return the number of bytes actually copied */
433 /* The condition that must be true for polling to end */
434 static bool wait_is_over(struct port *port)
436 return port_has_data(port) || !port->host_connected;
439 static ssize_t port_fops_read(struct file *filp, char __user *ubuf,
440 size_t count, loff_t *offp)
445 port = filp->private_data;
447 if (!port_has_data(port)) {
449 * If nothing's connected on the host just return 0 in
450 * case of list_empty; this tells the userspace app
451 * that there's no connection
453 if (!port->host_connected)
455 if (filp->f_flags & O_NONBLOCK)
458 ret = wait_event_interruptible(port->waitqueue,
464 * We could've received a disconnection message while we were
465 * waiting for more data.
467 * This check is not clubbed in the if() statement above as we
468 * might receive some data as well as the host could get
469 * disconnected after we got woken up from our wait. So we
470 * really want to give off whatever data we have and only then
471 * check for host_connected.
473 if (!port_has_data(port) && !port->host_connected)
476 return fill_readbuf(port, ubuf, count, true);
479 static ssize_t port_fops_write(struct file *filp, const char __user *ubuf,
480 size_t count, loff_t *offp)
486 port = filp->private_data;
488 count = min((size_t)(32 * 1024), count);
490 buf = kmalloc(count, GFP_KERNEL);
494 ret = copy_from_user(buf, ubuf, count);
500 ret = send_buf(port, buf, count);
506 static unsigned int port_fops_poll(struct file *filp, poll_table *wait)
511 port = filp->private_data;
512 poll_wait(filp, &port->waitqueue, wait);
516 ret |= POLLIN | POLLRDNORM;
517 if (port->host_connected)
519 if (!port->host_connected)
525 static int port_fops_release(struct inode *inode, struct file *filp)
529 port = filp->private_data;
531 /* Notify host of port being closed */
532 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0);
534 port->guest_connected = false;
539 static int port_fops_open(struct inode *inode, struct file *filp)
541 struct cdev *cdev = inode->i_cdev;
544 port = container_of(cdev, struct port, cdev);
545 filp->private_data = port;
548 * Don't allow opening of console port devices -- that's done
551 if (is_console_port(port))
554 /* Allow only one process to open a particular port at a time */
555 spin_lock_irq(&port->inbuf_lock);
556 if (port->guest_connected) {
557 spin_unlock_irq(&port->inbuf_lock);
561 port->guest_connected = true;
562 spin_unlock_irq(&port->inbuf_lock);
564 /* Notify host of port being opened */
565 send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1);
571 * The file operations that we support: programs in the guest can open
572 * a console device, read from it, write to it, poll for data and
573 * close it. The devices are at
574 * /dev/vport<device number>p<port number>
576 static const struct file_operations port_fops = {
577 .owner = THIS_MODULE,
578 .open = port_fops_open,
579 .read = port_fops_read,
580 .write = port_fops_write,
581 .poll = port_fops_poll,
582 .release = port_fops_release,
586 * The put_chars() callback is pretty straightforward.
588 * We turn the characters into a scatter-gather list, add it to the
589 * output queue and then kick the Host. Then we sit here waiting for
590 * it to finish: inefficient in theory, but in practice
591 * implementations will do it immediately (lguest's Launcher does).
593 static int put_chars(u32 vtermno, const char *buf, int count)
597 port = find_port_by_vtermno(vtermno);
601 if (unlikely(early_put_chars))
602 return early_put_chars(vtermno, buf, count);
604 return send_buf(port, (void *)buf, count);
608 * get_chars() is the callback from the hvc_console infrastructure
609 * when an interrupt is received.
611 * We call out to fill_readbuf that gets us the required data from the
612 * buffers that are queued up.
614 static int get_chars(u32 vtermno, char *buf, int count)
618 port = find_port_by_vtermno(vtermno);
622 /* If we don't have an input queue yet, we can't get input. */
623 BUG_ON(!port->in_vq);
625 return fill_readbuf(port, buf, count, false);
628 static void resize_console(struct port *port)
630 struct virtio_device *vdev;
633 vdev = port->portdev->vdev;
634 if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) {
635 vdev->config->get(vdev,
636 offsetof(struct virtio_console_config, cols),
637 &ws.ws_col, sizeof(u16));
638 vdev->config->get(vdev,
639 offsetof(struct virtio_console_config, rows),
640 &ws.ws_row, sizeof(u16));
641 hvc_resize(port->cons.hvc, ws);
645 static void virtcons_apply_config(struct virtio_device *vdev)
647 resize_console(find_port_by_vtermno(0));
650 /* We set the configuration at this point, since we now have a tty */
651 static int notifier_add_vio(struct hvc_struct *hp, int data)
655 port = find_port_by_vtermno(hp->vtermno);
659 hp->irq_requested = 1;
660 resize_console(port);
665 static void notifier_del_vio(struct hvc_struct *hp, int data)
667 hp->irq_requested = 0;
670 /* The operations for console ports. */
671 static const struct hv_ops hv_ops = {
672 .get_chars = get_chars,
673 .put_chars = put_chars,
674 .notifier_add = notifier_add_vio,
675 .notifier_del = notifier_del_vio,
676 .notifier_hangup = notifier_del_vio,
680 * Console drivers are initialized very early so boot messages can go
681 * out, so we do things slightly differently from the generic virtio
682 * initialization of the net and block drivers.
684 * At this stage, the console is output-only. It's too early to set
685 * up a virtqueue, so we let the drivers do some boutique early-output
688 int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int))
690 early_put_chars = put_chars;
691 return hvc_instantiate(0, 0, &hv_ops);
694 int init_port_console(struct port *port)
699 * The Host's telling us this port is a console port. Hook it
700 * up with an hvc console.
702 * To set up and manage our virtual console, we call
705 * The first argument of hvc_alloc() is the virtual console
706 * number. The second argument is the parameter for the
707 * notification mechanism (like irq number). We currently
708 * leave this as zero, virtqueues have implicit notifications.
710 * The third argument is a "struct hv_ops" containing the
711 * put_chars() get_chars(), notifier_add() and notifier_del()
712 * pointers. The final argument is the output buffer size: we
713 * can do any size, so we put PAGE_SIZE here.
715 port->cons.vtermno = pdrvdata.next_vtermno;
717 port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE);
718 if (IS_ERR(port->cons.hvc)) {
719 ret = PTR_ERR(port->cons.hvc);
720 port->cons.hvc = NULL;
723 spin_lock_irq(&pdrvdata_lock);
724 pdrvdata.next_vtermno++;
725 list_add_tail(&port->cons.list, &pdrvdata.consoles);
726 spin_unlock_irq(&pdrvdata_lock);
727 port->guest_connected = true;
729 /* Notify host of port being opened */
730 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
735 /* Any private messages that the Host and Guest want to share */
736 static void handle_control_message(struct ports_device *portdev,
737 struct port_buffer *buf)
739 struct virtio_console_control *cpkt;
742 cpkt = (struct virtio_console_control *)(buf->buf + buf->offset);
744 port = find_port_by_id(portdev, cpkt->id);
746 /* No valid header at start of buffer. Drop it. */
747 dev_dbg(&portdev->vdev->dev,
748 "Invalid index %u in control packet\n", cpkt->id);
752 switch (cpkt->event) {
753 case VIRTIO_CONSOLE_CONSOLE_PORT:
756 if (is_console_port(port))
759 init_port_console(port);
761 * Could remove the port here in case init fails - but
762 * have to notify the host first.
765 case VIRTIO_CONSOLE_RESIZE:
766 if (!is_console_port(port))
768 port->cons.hvc->irq_requested = 1;
769 resize_console(port);
771 case VIRTIO_CONSOLE_PORT_OPEN:
772 port->host_connected = cpkt->value;
773 wake_up_interruptible(&port->waitqueue);
778 static void control_work_handler(struct work_struct *work)
780 struct ports_device *portdev;
781 struct virtqueue *vq;
782 struct port_buffer *buf;
785 portdev = container_of(work, struct ports_device, control_work);
788 spin_lock(&portdev->cvq_lock);
789 while ((buf = vq->vq_ops->get_buf(vq, &len))) {
790 spin_unlock(&portdev->cvq_lock);
795 handle_control_message(portdev, buf);
797 spin_lock(&portdev->cvq_lock);
798 if (add_inbuf(portdev->c_ivq, buf) < 0) {
799 dev_warn(&portdev->vdev->dev,
800 "Error adding buffer to queue\n");
804 spin_unlock(&portdev->cvq_lock);
807 static void in_intr(struct virtqueue *vq)
812 port = find_port_by_vq(vq->vdev->priv, vq);
816 spin_lock_irqsave(&port->inbuf_lock, flags);
817 port->inbuf = get_inbuf(port);
819 spin_unlock_irqrestore(&port->inbuf_lock, flags);
821 wake_up_interruptible(&port->waitqueue);
823 if (is_console_port(port) && hvc_poll(port->cons.hvc))
827 static void control_intr(struct virtqueue *vq)
829 struct ports_device *portdev;
831 portdev = vq->vdev->priv;
832 schedule_work(&portdev->control_work);
835 static void fill_queue(struct virtqueue *vq, spinlock_t *lock)
837 struct port_buffer *buf;
841 buf = alloc_buf(PAGE_SIZE);
846 ret = add_inbuf(vq, buf);
848 spin_unlock_irq(lock);
852 spin_unlock_irq(lock);
856 static int add_port(struct ports_device *portdev, u32 id)
859 struct port_buffer *inbuf;
863 port = kmalloc(sizeof(*port), GFP_KERNEL);
869 port->portdev = portdev;
873 port->cons.hvc = NULL;
875 port->host_connected = port->guest_connected = false;
877 port->in_vq = portdev->in_vqs[port->id];
878 port->out_vq = portdev->out_vqs[port->id];
880 cdev_init(&port->cdev, &port_fops);
882 devt = MKDEV(portdev->chr_major, id);
883 err = cdev_add(&port->cdev, devt, 1);
885 dev_err(&port->portdev->vdev->dev,
886 "Error %d adding cdev for port %u\n", err, id);
889 port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev,
890 devt, port, "vport%up%u",
891 port->portdev->drv_index, id);
892 if (IS_ERR(port->dev)) {
893 err = PTR_ERR(port->dev);
894 dev_err(&port->portdev->vdev->dev,
895 "Error %d creating device for port %u\n",
900 spin_lock_init(&port->inbuf_lock);
901 init_waitqueue_head(&port->waitqueue);
903 inbuf = alloc_buf(PAGE_SIZE);
909 /* Register the input buffer the first time. */
910 add_inbuf(port->in_vq, inbuf);
913 * If we're not using multiport support, this has to be a console port
915 if (!use_multiport(port->portdev)) {
916 err = init_port_console(port);
921 spin_lock_irq(&portdev->ports_lock);
922 list_add_tail(&port->list, &port->portdev->ports);
923 spin_unlock_irq(&portdev->ports_lock);
926 * Tell the Host we're set so that it can send us various
927 * configuration parameters for this port (eg, port name,
928 * caching, whether this is a console port, etc.)
930 send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
937 device_destroy(pdrvdata.class, port->dev->devt);
939 cdev_del(&port->cdev);
946 static int init_vqs(struct ports_device *portdev)
948 vq_callback_t **io_callbacks;
950 struct virtqueue **vqs;
951 u32 i, j, nr_ports, nr_queues;
954 nr_ports = portdev->config.max_nr_ports;
955 nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2;
957 vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL);
962 io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL);
967 io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL);
972 portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *),
974 if (!portdev->in_vqs) {
978 portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *),
980 if (!portdev->out_vqs) {
986 * For backward compat (newer host but older guest), the host
987 * spawns a console port first and also inits the vqs for port
991 io_callbacks[j] = in_intr;
992 io_callbacks[j + 1] = NULL;
993 io_names[j] = "input";
994 io_names[j + 1] = "output";
997 if (use_multiport(portdev)) {
998 io_callbacks[j] = control_intr;
999 io_callbacks[j + 1] = NULL;
1000 io_names[j] = "control-i";
1001 io_names[j + 1] = "control-o";
1003 for (i = 1; i < nr_ports; i++) {
1005 io_callbacks[j] = in_intr;
1006 io_callbacks[j + 1] = NULL;
1007 io_names[j] = "input";
1008 io_names[j + 1] = "output";
1011 /* Find the queues. */
1012 err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs,
1014 (const char **)io_names);
1019 portdev->in_vqs[0] = vqs[0];
1020 portdev->out_vqs[0] = vqs[1];
1022 if (use_multiport(portdev)) {
1023 portdev->c_ivq = vqs[j];
1024 portdev->c_ovq = vqs[j + 1];
1026 for (i = 1; i < nr_ports; i++) {
1028 portdev->in_vqs[i] = vqs[j];
1029 portdev->out_vqs[i] = vqs[j + 1];
1032 kfree(io_callbacks);
1041 kfree(io_callbacks);
1043 kfree(portdev->out_vqs);
1045 kfree(portdev->in_vqs);
1052 static const struct file_operations portdev_fops = {
1053 .owner = THIS_MODULE,
1057 * Once we're further in boot, we get probed like any other virtio
1060 * If the host also supports multiple console ports, we check the
1061 * config space to see how many ports the host has spawned. We
1062 * initialize each port found.
1064 static int __devinit virtcons_probe(struct virtio_device *vdev)
1066 struct ports_device *portdev;
1071 portdev = kmalloc(sizeof(*portdev), GFP_KERNEL);
1077 /* Attach this portdev to this virtio_device, and vice-versa. */
1078 portdev->vdev = vdev;
1079 vdev->priv = portdev;
1081 spin_lock_irq(&pdrvdata_lock);
1082 portdev->drv_index = pdrvdata.index++;
1083 spin_unlock_irq(&pdrvdata_lock);
1085 portdev->chr_major = register_chrdev(0, "virtio-portsdev",
1087 if (portdev->chr_major < 0) {
1089 "Error %d registering chrdev for device %u\n",
1090 portdev->chr_major, portdev->drv_index);
1091 err = portdev->chr_major;
1096 portdev->config.nr_ports = 1;
1097 portdev->config.max_nr_ports = 1;
1098 if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) {
1100 vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT;
1102 vdev->config->get(vdev, offsetof(struct virtio_console_config,
1104 &portdev->config.nr_ports,
1105 sizeof(portdev->config.nr_ports));
1106 vdev->config->get(vdev, offsetof(struct virtio_console_config,
1108 &portdev->config.max_nr_ports,
1109 sizeof(portdev->config.max_nr_ports));
1110 if (portdev->config.nr_ports > portdev->config.max_nr_ports) {
1111 dev_warn(&vdev->dev,
1112 "More ports (%u) specified than allowed (%u). Will init %u ports.",
1113 portdev->config.nr_ports,
1114 portdev->config.max_nr_ports,
1115 portdev->config.max_nr_ports);
1117 portdev->config.nr_ports = portdev->config.max_nr_ports;
1121 /* Let the Host know we support multiple ports.*/
1122 vdev->config->finalize_features(vdev);
1124 err = init_vqs(portdev);
1126 dev_err(&vdev->dev, "Error %d initializing vqs\n", err);
1130 spin_lock_init(&portdev->ports_lock);
1131 INIT_LIST_HEAD(&portdev->ports);
1134 spin_lock_init(&portdev->cvq_lock);
1135 INIT_WORK(&portdev->control_work, &control_work_handler);
1137 fill_queue(portdev->c_ivq, &portdev->cvq_lock);
1140 for (i = 0; i < portdev->config.nr_ports; i++)
1141 add_port(portdev, i);
1143 /* Start using the new console output. */
1144 early_put_chars = NULL;
1148 unregister_chrdev(portdev->chr_major, "virtio-portsdev");
1155 static struct virtio_device_id id_table[] = {
1156 { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID },
1160 static unsigned int features[] = {
1161 VIRTIO_CONSOLE_F_SIZE,
1162 VIRTIO_CONSOLE_F_MULTIPORT,
1165 static struct virtio_driver virtio_console = {
1166 .feature_table = features,
1167 .feature_table_size = ARRAY_SIZE(features),
1168 .driver.name = KBUILD_MODNAME,
1169 .driver.owner = THIS_MODULE,
1170 .id_table = id_table,
1171 .probe = virtcons_probe,
1172 .config_changed = virtcons_apply_config,
1175 static int __init init(void)
1179 pdrvdata.class = class_create(THIS_MODULE, "virtio-ports");
1180 if (IS_ERR(pdrvdata.class)) {
1181 err = PTR_ERR(pdrvdata.class);
1182 pr_err("Error %d creating virtio-ports class\n", err);
1185 INIT_LIST_HEAD(&pdrvdata.consoles);
1187 return register_virtio_driver(&virtio_console);
1191 MODULE_DEVICE_TABLE(virtio, id_table);
1192 MODULE_DESCRIPTION("Virtio console driver");
1193 MODULE_LICENSE("GPL");