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>
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/spinlock.h>
25 #include <linux/virtio.h>
26 #include <linux/virtio_console.h>
27 #include <linux/workqueue.h>
28 #include "hvc_console.h"
31 * This is a global struct for storing common data for all the devices
32 * this driver handles.
34 * Mainly, it has a linked list for all the consoles in one place so
35 * that callbacks from hvc for get_chars(), put_chars() work properly
36 * across multiple devices and multiple ports per device.
38 struct ports_driver_data
{
39 /* Used for registering chardevs */
42 /* Number of devices this driver is handling */
46 * This is used to keep track of the number of hvc consoles
47 * spawned by this driver. This number is given as the first
48 * argument to hvc_alloc(). To correctly map an initial
49 * console spawned via hvc_instantiate to the console being
50 * hooked up via hvc_alloc, we need to pass the same vtermno.
52 * We also just assume the first console being initialised was
53 * the first one that got used as the initial console.
55 unsigned int next_vtermno
;
57 /* All the console devices handled by this driver */
58 struct list_head consoles
;
60 static struct ports_driver_data pdrvdata
;
62 DEFINE_SPINLOCK(pdrvdata_lock
);
64 /* This struct holds information that's relevant only for console ports */
66 /* We'll place all consoles in a list in the pdrvdata struct */
67 struct list_head list
;
69 /* The hvc device associated with this console port */
70 struct hvc_struct
*hvc
;
73 * This number identifies the number that we used to register
74 * with hvc in hvc_instantiate() and hvc_alloc(); this is the
75 * number passed on by the hvc callbacks to us to
76 * differentiate between the other console ports handled by
85 /* size of the buffer in *buf above */
88 /* used length of the buffer */
90 /* offset in the buf from which to consume data */
95 * This is a per-device struct that stores data common to all the
96 * ports for that device (vdev->priv).
100 * Workqueue handlers where we process deferred work after
103 struct work_struct control_work
;
105 struct list_head ports
;
107 /* To protect the list of ports */
108 spinlock_t ports_lock
;
110 /* To protect the vq operations for the control channel */
113 /* The current config space is stored here */
114 struct virtio_console_config config
;
116 /* The virtio device we're associated with */
117 struct virtio_device
*vdev
;
120 * A couple of virtqueues for the control channel: one for
121 * guest->host transfers, one for host->guest transfers
123 struct virtqueue
*c_ivq
, *c_ovq
;
125 /* Array of per-port IO virtqueues */
126 struct virtqueue
**in_vqs
, **out_vqs
;
128 /* Used for numbering devices for sysfs and debugfs */
129 unsigned int drv_index
;
131 /* Major number for this device. Ports will be created as minors. */
135 /* This struct holds the per-port data */
137 /* Next port in the list, head is in the ports_device */
138 struct list_head list
;
140 /* Pointer to the parent virtio_console device */
141 struct ports_device
*portdev
;
143 /* The current buffer from which data has to be fed to readers */
144 struct port_buffer
*inbuf
;
147 * To protect the operations on the in_vq associated with this
148 * port. Has to be a spinlock because it can be called from
149 * interrupt context (get_char()).
151 spinlock_t inbuf_lock
;
153 /* The IO vqs for this port */
154 struct virtqueue
*in_vq
, *out_vq
;
157 * The entries in this struct will be valid if this port is
158 * hooked up to an hvc console
162 /* Each port associates with a separate char device */
166 /* The 'id' to identify the port with the Host */
170 /* This is the very early arch-specified put chars function. */
171 static int (*early_put_chars
)(u32
, const char *, int);
173 static struct port
*find_port_by_vtermno(u32 vtermno
)
176 struct console
*cons
;
179 spin_lock_irqsave(&pdrvdata_lock
, flags
);
180 list_for_each_entry(cons
, &pdrvdata
.consoles
, list
) {
181 if (cons
->vtermno
== vtermno
) {
182 port
= container_of(cons
, struct port
, cons
);
188 spin_unlock_irqrestore(&pdrvdata_lock
, flags
);
192 static struct port
*find_port_by_id(struct ports_device
*portdev
, u32 id
)
197 spin_lock_irqsave(&portdev
->ports_lock
, flags
);
198 list_for_each_entry(port
, &portdev
->ports
, list
)
203 spin_unlock_irqrestore(&portdev
->ports_lock
, flags
);
208 static struct port
*find_port_by_vq(struct ports_device
*portdev
,
209 struct virtqueue
*vq
)
214 spin_lock_irqsave(&portdev
->ports_lock
, flags
);
215 list_for_each_entry(port
, &portdev
->ports
, list
)
216 if (port
->in_vq
== vq
|| port
->out_vq
== vq
)
220 spin_unlock_irqrestore(&portdev
->ports_lock
, flags
);
224 static bool is_console_port(struct port
*port
)
231 static inline bool use_multiport(struct ports_device
*portdev
)
234 * This condition can be true when put_chars is called from
239 return portdev
->vdev
->features
[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT
);
242 static void free_buf(struct port_buffer
*buf
)
248 static struct port_buffer
*alloc_buf(size_t buf_size
)
250 struct port_buffer
*buf
;
252 buf
= kmalloc(sizeof(*buf
), GFP_KERNEL
);
255 buf
->buf
= kzalloc(buf_size
, GFP_KERNEL
);
260 buf
->size
= buf_size
;
269 /* Callers should take appropriate locks */
270 static void *get_inbuf(struct port
*port
)
272 struct port_buffer
*buf
;
273 struct virtqueue
*vq
;
277 buf
= vq
->vq_ops
->get_buf(vq
, &len
);
286 * Create a scatter-gather list representing our input buffer and put
289 * Callers should take appropriate locks.
291 static int add_inbuf(struct virtqueue
*vq
, struct port_buffer
*buf
)
293 struct scatterlist sg
[1];
296 sg_init_one(sg
, buf
->buf
, buf
->size
);
298 ret
= vq
->vq_ops
->add_buf(vq
, sg
, 0, 1, buf
);
299 vq
->vq_ops
->kick(vq
);
303 static bool port_has_data(struct port
*port
)
309 spin_lock_irqsave(&port
->inbuf_lock
, flags
);
312 spin_unlock_irqrestore(&port
->inbuf_lock
, flags
);
317 static ssize_t
send_control_msg(struct port
*port
, unsigned int event
,
320 struct scatterlist sg
[1];
321 struct virtio_console_control cpkt
;
322 struct virtqueue
*vq
;
325 if (!use_multiport(port
->portdev
))
332 vq
= port
->portdev
->c_ovq
;
334 sg_init_one(sg
, &cpkt
, sizeof(cpkt
));
335 if (vq
->vq_ops
->add_buf(vq
, sg
, 1, 0, &cpkt
) >= 0) {
336 vq
->vq_ops
->kick(vq
);
337 while (!vq
->vq_ops
->get_buf(vq
, &len
))
343 static ssize_t
send_buf(struct port
*port
, void *in_buf
, size_t in_count
)
345 struct scatterlist sg
[1];
346 struct virtqueue
*out_vq
;
350 out_vq
= port
->out_vq
;
352 sg_init_one(sg
, in_buf
, in_count
);
353 ret
= out_vq
->vq_ops
->add_buf(out_vq
, sg
, 1, 0, in_buf
);
355 /* Tell Host to go! */
356 out_vq
->vq_ops
->kick(out_vq
);
364 * Wait till the host acknowledges it pushed out the data we
365 * sent. Also ensure we return to userspace the number of
366 * bytes that were successfully consumed by the host.
368 while (!out_vq
->vq_ops
->get_buf(out_vq
, &len
))
371 /* We're expected to return the amount of data we wrote */
376 * Give out the data that's requested from the buffer that we have
379 static ssize_t
fill_readbuf(struct port
*port
, char *out_buf
, size_t out_count
,
382 struct port_buffer
*buf
;
385 if (!out_count
|| !port_has_data(port
))
389 out_count
= min(out_count
, buf
->len
- buf
->offset
);
394 ret
= copy_to_user(out_buf
, buf
->buf
+ buf
->offset
, out_count
);
398 memcpy(out_buf
, buf
->buf
+ buf
->offset
, out_count
);
401 buf
->offset
+= out_count
;
403 if (buf
->offset
== buf
->len
) {
405 * We're done using all the data in this buffer.
406 * Re-queue so that the Host can send us more data.
408 spin_lock_irqsave(&port
->inbuf_lock
, flags
);
411 if (add_inbuf(port
->in_vq
, buf
) < 0)
412 dev_warn(port
->dev
, "failed add_buf\n");
414 spin_unlock_irqrestore(&port
->inbuf_lock
, flags
);
416 /* Return the number of bytes actually copied */
421 * The put_chars() callback is pretty straightforward.
423 * We turn the characters into a scatter-gather list, add it to the
424 * output queue and then kick the Host. Then we sit here waiting for
425 * it to finish: inefficient in theory, but in practice
426 * implementations will do it immediately (lguest's Launcher does).
428 static int put_chars(u32 vtermno
, const char *buf
, int count
)
432 port
= find_port_by_vtermno(vtermno
);
436 if (unlikely(early_put_chars
))
437 return early_put_chars(vtermno
, buf
, count
);
439 return send_buf(port
, (void *)buf
, count
);
443 * get_chars() is the callback from the hvc_console infrastructure
444 * when an interrupt is received.
446 * We call out to fill_readbuf that gets us the required data from the
447 * buffers that are queued up.
449 static int get_chars(u32 vtermno
, char *buf
, int count
)
453 port
= find_port_by_vtermno(vtermno
);
457 /* If we don't have an input queue yet, we can't get input. */
458 BUG_ON(!port
->in_vq
);
460 return fill_readbuf(port
, buf
, count
, false);
463 static void resize_console(struct port
*port
)
465 struct virtio_device
*vdev
;
468 vdev
= port
->portdev
->vdev
;
469 if (virtio_has_feature(vdev
, VIRTIO_CONSOLE_F_SIZE
)) {
470 vdev
->config
->get(vdev
,
471 offsetof(struct virtio_console_config
, cols
),
472 &ws
.ws_col
, sizeof(u16
));
473 vdev
->config
->get(vdev
,
474 offsetof(struct virtio_console_config
, rows
),
475 &ws
.ws_row
, sizeof(u16
));
476 hvc_resize(port
->cons
.hvc
, ws
);
480 static void virtcons_apply_config(struct virtio_device
*vdev
)
482 resize_console(find_port_by_vtermno(0));
485 /* We set the configuration at this point, since we now have a tty */
486 static int notifier_add_vio(struct hvc_struct
*hp
, int data
)
490 port
= find_port_by_vtermno(hp
->vtermno
);
494 hp
->irq_requested
= 1;
495 resize_console(port
);
500 static void notifier_del_vio(struct hvc_struct
*hp
, int data
)
502 hp
->irq_requested
= 0;
505 /* The operations for console ports. */
506 static const struct hv_ops hv_ops
= {
507 .get_chars
= get_chars
,
508 .put_chars
= put_chars
,
509 .notifier_add
= notifier_add_vio
,
510 .notifier_del
= notifier_del_vio
,
511 .notifier_hangup
= notifier_del_vio
,
515 * Console drivers are initialized very early so boot messages can go
516 * out, so we do things slightly differently from the generic virtio
517 * initialization of the net and block drivers.
519 * At this stage, the console is output-only. It's too early to set
520 * up a virtqueue, so we let the drivers do some boutique early-output
523 int __init
virtio_cons_early_init(int (*put_chars
)(u32
, const char *, int))
525 early_put_chars
= put_chars
;
526 return hvc_instantiate(0, 0, &hv_ops
);
529 int init_port_console(struct port
*port
)
534 * The Host's telling us this port is a console port. Hook it
535 * up with an hvc console.
537 * To set up and manage our virtual console, we call
540 * The first argument of hvc_alloc() is the virtual console
541 * number. The second argument is the parameter for the
542 * notification mechanism (like irq number). We currently
543 * leave this as zero, virtqueues have implicit notifications.
545 * The third argument is a "struct hv_ops" containing the
546 * put_chars() get_chars(), notifier_add() and notifier_del()
547 * pointers. The final argument is the output buffer size: we
548 * can do any size, so we put PAGE_SIZE here.
550 port
->cons
.vtermno
= pdrvdata
.next_vtermno
;
552 port
->cons
.hvc
= hvc_alloc(port
->cons
.vtermno
, 0, &hv_ops
, PAGE_SIZE
);
553 if (IS_ERR(port
->cons
.hvc
)) {
554 ret
= PTR_ERR(port
->cons
.hvc
);
555 port
->cons
.hvc
= NULL
;
558 spin_lock_irq(&pdrvdata_lock
);
559 pdrvdata
.next_vtermno
++;
560 list_add_tail(&port
->cons
.list
, &pdrvdata
.consoles
);
561 spin_unlock_irq(&pdrvdata_lock
);
566 /* Any private messages that the Host and Guest want to share */
567 static void handle_control_message(struct ports_device
*portdev
,
568 struct port_buffer
*buf
)
570 struct virtio_console_control
*cpkt
;
573 cpkt
= (struct virtio_console_control
*)(buf
->buf
+ buf
->offset
);
575 port
= find_port_by_id(portdev
, cpkt
->id
);
577 /* No valid header at start of buffer. Drop it. */
578 dev_dbg(&portdev
->vdev
->dev
,
579 "Invalid index %u in control packet\n", cpkt
->id
);
583 switch (cpkt
->event
) {
584 case VIRTIO_CONSOLE_CONSOLE_PORT
:
587 if (is_console_port(port
))
590 init_port_console(port
);
592 * Could remove the port here in case init fails - but
593 * have to notify the host first.
596 case VIRTIO_CONSOLE_RESIZE
:
597 if (!is_console_port(port
))
599 port
->cons
.hvc
->irq_requested
= 1;
600 resize_console(port
);
605 static void control_work_handler(struct work_struct
*work
)
607 struct ports_device
*portdev
;
608 struct virtqueue
*vq
;
609 struct port_buffer
*buf
;
612 portdev
= container_of(work
, struct ports_device
, control_work
);
615 spin_lock(&portdev
->cvq_lock
);
616 while ((buf
= vq
->vq_ops
->get_buf(vq
, &len
))) {
617 spin_unlock(&portdev
->cvq_lock
);
622 handle_control_message(portdev
, buf
);
624 spin_lock(&portdev
->cvq_lock
);
625 if (add_inbuf(portdev
->c_ivq
, buf
) < 0) {
626 dev_warn(&portdev
->vdev
->dev
,
627 "Error adding buffer to queue\n");
631 spin_unlock(&portdev
->cvq_lock
);
634 static void in_intr(struct virtqueue
*vq
)
639 port
= find_port_by_vq(vq
->vdev
->priv
, vq
);
643 spin_lock_irqsave(&port
->inbuf_lock
, flags
);
644 port
->inbuf
= get_inbuf(port
);
646 spin_unlock_irqrestore(&port
->inbuf_lock
, flags
);
648 if (is_console_port(port
) && hvc_poll(port
->cons
.hvc
))
652 static void control_intr(struct virtqueue
*vq
)
654 struct ports_device
*portdev
;
656 portdev
= vq
->vdev
->priv
;
657 schedule_work(&portdev
->control_work
);
660 static void fill_queue(struct virtqueue
*vq
, spinlock_t
*lock
)
662 struct port_buffer
*buf
;
666 buf
= alloc_buf(PAGE_SIZE
);
671 ret
= add_inbuf(vq
, buf
);
673 spin_unlock_irq(lock
);
677 spin_unlock_irq(lock
);
681 static int add_port(struct ports_device
*portdev
, u32 id
)
684 struct port_buffer
*inbuf
;
688 port
= kmalloc(sizeof(*port
), GFP_KERNEL
);
694 port
->portdev
= portdev
;
698 port
->cons
.hvc
= NULL
;
700 port
->in_vq
= portdev
->in_vqs
[port
->id
];
701 port
->out_vq
= portdev
->out_vqs
[port
->id
];
703 cdev_init(&port
->cdev
, NULL
);
705 devt
= MKDEV(portdev
->chr_major
, id
);
706 err
= cdev_add(&port
->cdev
, devt
, 1);
708 dev_err(&port
->portdev
->vdev
->dev
,
709 "Error %d adding cdev for port %u\n", err
, id
);
712 port
->dev
= device_create(pdrvdata
.class, &port
->portdev
->vdev
->dev
,
713 devt
, port
, "vport%up%u",
714 port
->portdev
->drv_index
, id
);
715 if (IS_ERR(port
->dev
)) {
716 err
= PTR_ERR(port
->dev
);
717 dev_err(&port
->portdev
->vdev
->dev
,
718 "Error %d creating device for port %u\n",
723 spin_lock_init(&port
->inbuf_lock
);
725 inbuf
= alloc_buf(PAGE_SIZE
);
731 /* Register the input buffer the first time. */
732 add_inbuf(port
->in_vq
, inbuf
);
735 * If we're not using multiport support, this has to be a console port
737 if (!use_multiport(port
->portdev
)) {
738 err
= init_port_console(port
);
743 spin_lock_irq(&portdev
->ports_lock
);
744 list_add_tail(&port
->list
, &port
->portdev
->ports
);
745 spin_unlock_irq(&portdev
->ports_lock
);
748 * Tell the Host we're set so that it can send us various
749 * configuration parameters for this port (eg, port name,
750 * caching, whether this is a console port, etc.)
752 send_control_msg(port
, VIRTIO_CONSOLE_PORT_READY
, 1);
759 device_destroy(pdrvdata
.class, port
->dev
->devt
);
761 cdev_del(&port
->cdev
);
768 static int init_vqs(struct ports_device
*portdev
)
770 vq_callback_t
**io_callbacks
;
772 struct virtqueue
**vqs
;
773 u32 i
, j
, nr_ports
, nr_queues
;
776 nr_ports
= portdev
->config
.max_nr_ports
;
777 nr_queues
= use_multiport(portdev
) ? (nr_ports
+ 1) * 2 : 2;
779 vqs
= kmalloc(nr_queues
* sizeof(struct virtqueue
*), GFP_KERNEL
);
784 io_callbacks
= kmalloc(nr_queues
* sizeof(vq_callback_t
*), GFP_KERNEL
);
789 io_names
= kmalloc(nr_queues
* sizeof(char *), GFP_KERNEL
);
794 portdev
->in_vqs
= kmalloc(nr_ports
* sizeof(struct virtqueue
*),
796 if (!portdev
->in_vqs
) {
800 portdev
->out_vqs
= kmalloc(nr_ports
* sizeof(struct virtqueue
*),
802 if (!portdev
->out_vqs
) {
808 * For backward compat (newer host but older guest), the host
809 * spawns a console port first and also inits the vqs for port
813 io_callbacks
[j
] = in_intr
;
814 io_callbacks
[j
+ 1] = NULL
;
815 io_names
[j
] = "input";
816 io_names
[j
+ 1] = "output";
819 if (use_multiport(portdev
)) {
820 io_callbacks
[j
] = control_intr
;
821 io_callbacks
[j
+ 1] = NULL
;
822 io_names
[j
] = "control-i";
823 io_names
[j
+ 1] = "control-o";
825 for (i
= 1; i
< nr_ports
; i
++) {
827 io_callbacks
[j
] = in_intr
;
828 io_callbacks
[j
+ 1] = NULL
;
829 io_names
[j
] = "input";
830 io_names
[j
+ 1] = "output";
833 /* Find the queues. */
834 err
= portdev
->vdev
->config
->find_vqs(portdev
->vdev
, nr_queues
, vqs
,
836 (const char **)io_names
);
841 portdev
->in_vqs
[0] = vqs
[0];
842 portdev
->out_vqs
[0] = vqs
[1];
844 if (use_multiport(portdev
)) {
845 portdev
->c_ivq
= vqs
[j
];
846 portdev
->c_ovq
= vqs
[j
+ 1];
848 for (i
= 1; i
< nr_ports
; i
++) {
850 portdev
->in_vqs
[i
] = vqs
[j
];
851 portdev
->out_vqs
[i
] = vqs
[j
+ 1];
865 kfree(portdev
->out_vqs
);
867 kfree(portdev
->in_vqs
);
874 static const struct file_operations portdev_fops
= {
875 .owner
= THIS_MODULE
,
879 * Once we're further in boot, we get probed like any other virtio
882 * If the host also supports multiple console ports, we check the
883 * config space to see how many ports the host has spawned. We
884 * initialize each port found.
886 static int __devinit
virtcons_probe(struct virtio_device
*vdev
)
888 struct ports_device
*portdev
;
893 portdev
= kmalloc(sizeof(*portdev
), GFP_KERNEL
);
899 /* Attach this portdev to this virtio_device, and vice-versa. */
900 portdev
->vdev
= vdev
;
901 vdev
->priv
= portdev
;
903 spin_lock_irq(&pdrvdata_lock
);
904 portdev
->drv_index
= pdrvdata
.index
++;
905 spin_unlock_irq(&pdrvdata_lock
);
907 portdev
->chr_major
= register_chrdev(0, "virtio-portsdev",
909 if (portdev
->chr_major
< 0) {
911 "Error %d registering chrdev for device %u\n",
912 portdev
->chr_major
, portdev
->drv_index
);
913 err
= portdev
->chr_major
;
918 portdev
->config
.nr_ports
= 1;
919 portdev
->config
.max_nr_ports
= 1;
920 if (virtio_has_feature(vdev
, VIRTIO_CONSOLE_F_MULTIPORT
)) {
922 vdev
->features
[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT
;
924 vdev
->config
->get(vdev
, offsetof(struct virtio_console_config
,
926 &portdev
->config
.nr_ports
,
927 sizeof(portdev
->config
.nr_ports
));
928 vdev
->config
->get(vdev
, offsetof(struct virtio_console_config
,
930 &portdev
->config
.max_nr_ports
,
931 sizeof(portdev
->config
.max_nr_ports
));
932 if (portdev
->config
.nr_ports
> portdev
->config
.max_nr_ports
) {
934 "More ports (%u) specified than allowed (%u). Will init %u ports.",
935 portdev
->config
.nr_ports
,
936 portdev
->config
.max_nr_ports
,
937 portdev
->config
.max_nr_ports
);
939 portdev
->config
.nr_ports
= portdev
->config
.max_nr_ports
;
943 /* Let the Host know we support multiple ports.*/
944 vdev
->config
->finalize_features(vdev
);
946 err
= init_vqs(portdev
);
948 dev_err(&vdev
->dev
, "Error %d initializing vqs\n", err
);
952 spin_lock_init(&portdev
->ports_lock
);
953 INIT_LIST_HEAD(&portdev
->ports
);
956 spin_lock_init(&portdev
->cvq_lock
);
957 INIT_WORK(&portdev
->control_work
, &control_work_handler
);
959 fill_queue(portdev
->c_ivq
, &portdev
->cvq_lock
);
962 for (i
= 0; i
< portdev
->config
.nr_ports
; i
++)
963 add_port(portdev
, i
);
965 /* Start using the new console output. */
966 early_put_chars
= NULL
;
970 unregister_chrdev(portdev
->chr_major
, "virtio-portsdev");
977 static struct virtio_device_id id_table
[] = {
978 { VIRTIO_ID_CONSOLE
, VIRTIO_DEV_ANY_ID
},
982 static unsigned int features
[] = {
983 VIRTIO_CONSOLE_F_SIZE
,
984 VIRTIO_CONSOLE_F_MULTIPORT
,
987 static struct virtio_driver virtio_console
= {
988 .feature_table
= features
,
989 .feature_table_size
= ARRAY_SIZE(features
),
990 .driver
.name
= KBUILD_MODNAME
,
991 .driver
.owner
= THIS_MODULE
,
992 .id_table
= id_table
,
993 .probe
= virtcons_probe
,
994 .config_changed
= virtcons_apply_config
,
997 static int __init
init(void)
1001 pdrvdata
.class = class_create(THIS_MODULE
, "virtio-ports");
1002 if (IS_ERR(pdrvdata
.class)) {
1003 err
= PTR_ERR(pdrvdata
.class);
1004 pr_err("Error %d creating virtio-ports class\n", err
);
1007 INIT_LIST_HEAD(&pdrvdata
.consoles
);
1009 return register_virtio_driver(&virtio_console
);
1013 MODULE_DEVICE_TABLE(virtio
, id_table
);
1014 MODULE_DESCRIPTION("Virtio console driver");
1015 MODULE_LICENSE("GPL");