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a23ea924 RR |
1 | /* |
2 | * Copyright (C) 2006, 2007, 2009 Rusty Russell, IBM Corporation | |
17634ba2 | 3 | * Copyright (C) 2009, 2010 Red Hat, Inc. |
31610434 RR |
4 | * |
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. | |
9 | * | |
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. | |
14 | * | |
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 | |
18 | */ | |
fb08bd27 AS |
19 | #include <linux/cdev.h> |
20 | #include <linux/device.h> | |
31610434 | 21 | #include <linux/err.h> |
2030fa49 | 22 | #include <linux/fs.h> |
31610434 | 23 | #include <linux/init.h> |
38edf58d | 24 | #include <linux/list.h> |
2030fa49 AS |
25 | #include <linux/poll.h> |
26 | #include <linux/sched.h> | |
38edf58d | 27 | #include <linux/spinlock.h> |
31610434 RR |
28 | #include <linux/virtio.h> |
29 | #include <linux/virtio_console.h> | |
2030fa49 | 30 | #include <linux/wait.h> |
17634ba2 | 31 | #include <linux/workqueue.h> |
31610434 RR |
32 | #include "hvc_console.h" |
33 | ||
38edf58d AS |
34 | /* |
35 | * This is a global struct for storing common data for all the devices | |
36 | * this driver handles. | |
37 | * | |
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. | |
41 | */ | |
42 | struct ports_driver_data { | |
fb08bd27 AS |
43 | /* Used for registering chardevs */ |
44 | struct class *class; | |
45 | ||
46 | /* Number of devices this driver is handling */ | |
47 | unsigned int index; | |
48 | ||
d8a02bd5 RR |
49 | /* |
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. | |
55 | * | |
56 | * We also just assume the first console being initialised was | |
57 | * the first one that got used as the initial console. | |
58 | */ | |
59 | unsigned int next_vtermno; | |
60 | ||
38edf58d AS |
61 | /* All the console devices handled by this driver */ |
62 | struct list_head consoles; | |
63 | }; | |
64 | static struct ports_driver_data pdrvdata; | |
65 | ||
66 | DEFINE_SPINLOCK(pdrvdata_lock); | |
67 | ||
4f23c573 AS |
68 | /* This struct holds information that's relevant only for console ports */ |
69 | struct console { | |
70 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
71 | struct list_head list; | |
72 | ||
73 | /* The hvc device associated with this console port */ | |
74 | struct hvc_struct *hvc; | |
75 | ||
76 | /* | |
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 | |
81 | * this driver | |
82 | */ | |
83 | u32 vtermno; | |
84 | }; | |
85 | ||
fdb9a054 AS |
86 | struct port_buffer { |
87 | char *buf; | |
88 | ||
89 | /* size of the buffer in *buf above */ | |
90 | size_t size; | |
91 | ||
92 | /* used length of the buffer */ | |
93 | size_t len; | |
94 | /* offset in the buf from which to consume data */ | |
95 | size_t offset; | |
96 | }; | |
97 | ||
17634ba2 AS |
98 | /* |
99 | * This is a per-device struct that stores data common to all the | |
100 | * ports for that device (vdev->priv). | |
101 | */ | |
102 | struct ports_device { | |
103 | /* | |
104 | * Workqueue handlers where we process deferred work after | |
105 | * notification | |
106 | */ | |
107 | struct work_struct control_work; | |
108 | ||
109 | struct list_head ports; | |
110 | ||
111 | /* To protect the list of ports */ | |
112 | spinlock_t ports_lock; | |
113 | ||
114 | /* To protect the vq operations for the control channel */ | |
115 | spinlock_t cvq_lock; | |
116 | ||
117 | /* The current config space is stored here */ | |
118 | struct virtio_console_config config; | |
119 | ||
120 | /* The virtio device we're associated with */ | |
121 | struct virtio_device *vdev; | |
122 | ||
123 | /* | |
124 | * A couple of virtqueues for the control channel: one for | |
125 | * guest->host transfers, one for host->guest transfers | |
126 | */ | |
127 | struct virtqueue *c_ivq, *c_ovq; | |
128 | ||
129 | /* Array of per-port IO virtqueues */ | |
130 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
131 | |
132 | /* Used for numbering devices for sysfs and debugfs */ | |
133 | unsigned int drv_index; | |
134 | ||
135 | /* Major number for this device. Ports will be created as minors. */ | |
136 | int chr_major; | |
17634ba2 AS |
137 | }; |
138 | ||
1c85bf35 | 139 | /* This struct holds the per-port data */ |
21206ede | 140 | struct port { |
17634ba2 AS |
141 | /* Next port in the list, head is in the ports_device */ |
142 | struct list_head list; | |
143 | ||
1c85bf35 AS |
144 | /* Pointer to the parent virtio_console device */ |
145 | struct ports_device *portdev; | |
fdb9a054 AS |
146 | |
147 | /* The current buffer from which data has to be fed to readers */ | |
148 | struct port_buffer *inbuf; | |
21206ede | 149 | |
203baab8 AS |
150 | /* |
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()). | |
154 | */ | |
155 | spinlock_t inbuf_lock; | |
156 | ||
1c85bf35 AS |
157 | /* The IO vqs for this port */ |
158 | struct virtqueue *in_vq, *out_vq; | |
159 | ||
4f23c573 AS |
160 | /* |
161 | * The entries in this struct will be valid if this port is | |
162 | * hooked up to an hvc console | |
163 | */ | |
164 | struct console cons; | |
17634ba2 | 165 | |
fb08bd27 AS |
166 | /* Each port associates with a separate char device */ |
167 | struct cdev cdev; | |
168 | struct device *dev; | |
169 | ||
2030fa49 AS |
170 | /* A waitqueue for poll() or blocking read operations */ |
171 | wait_queue_head_t waitqueue; | |
172 | ||
17634ba2 AS |
173 | /* The 'id' to identify the port with the Host */ |
174 | u32 id; | |
2030fa49 AS |
175 | |
176 | /* Is the host device open */ | |
177 | bool host_connected; | |
3c7969cc AS |
178 | |
179 | /* We should allow only one process to open a port */ | |
180 | bool guest_connected; | |
21206ede | 181 | }; |
31610434 | 182 | |
971f3390 RR |
183 | /* This is the very early arch-specified put chars function. */ |
184 | static int (*early_put_chars)(u32, const char *, int); | |
185 | ||
38edf58d AS |
186 | static struct port *find_port_by_vtermno(u32 vtermno) |
187 | { | |
188 | struct port *port; | |
4f23c573 | 189 | struct console *cons; |
38edf58d AS |
190 | unsigned long flags; |
191 | ||
192 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
193 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
194 | if (cons->vtermno == vtermno) { | |
195 | port = container_of(cons, struct port, cons); | |
38edf58d | 196 | goto out; |
4f23c573 | 197 | } |
38edf58d AS |
198 | } |
199 | port = NULL; | |
200 | out: | |
201 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
202 | return port; | |
203 | } | |
204 | ||
17634ba2 AS |
205 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
206 | { | |
207 | struct port *port; | |
208 | unsigned long flags; | |
209 | ||
210 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
211 | list_for_each_entry(port, &portdev->ports, list) | |
212 | if (port->id == id) | |
213 | goto out; | |
214 | port = NULL; | |
215 | out: | |
216 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
217 | ||
218 | return port; | |
219 | } | |
220 | ||
203baab8 AS |
221 | static struct port *find_port_by_vq(struct ports_device *portdev, |
222 | struct virtqueue *vq) | |
223 | { | |
224 | struct port *port; | |
203baab8 AS |
225 | unsigned long flags; |
226 | ||
17634ba2 AS |
227 | spin_lock_irqsave(&portdev->ports_lock, flags); |
228 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
229 | if (port->in_vq == vq || port->out_vq == vq) |
230 | goto out; | |
203baab8 AS |
231 | port = NULL; |
232 | out: | |
17634ba2 | 233 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
234 | return port; |
235 | } | |
236 | ||
17634ba2 AS |
237 | static bool is_console_port(struct port *port) |
238 | { | |
239 | if (port->cons.hvc) | |
240 | return true; | |
241 | return false; | |
242 | } | |
243 | ||
244 | static inline bool use_multiport(struct ports_device *portdev) | |
245 | { | |
246 | /* | |
247 | * This condition can be true when put_chars is called from | |
248 | * early_init | |
249 | */ | |
250 | if (!portdev->vdev) | |
251 | return 0; | |
252 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
253 | } | |
254 | ||
fdb9a054 AS |
255 | static void free_buf(struct port_buffer *buf) |
256 | { | |
257 | kfree(buf->buf); | |
258 | kfree(buf); | |
259 | } | |
260 | ||
261 | static struct port_buffer *alloc_buf(size_t buf_size) | |
262 | { | |
263 | struct port_buffer *buf; | |
264 | ||
265 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
266 | if (!buf) | |
267 | goto fail; | |
268 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
269 | if (!buf->buf) | |
270 | goto free_buf; | |
271 | buf->len = 0; | |
272 | buf->offset = 0; | |
273 | buf->size = buf_size; | |
274 | return buf; | |
275 | ||
276 | free_buf: | |
277 | kfree(buf); | |
278 | fail: | |
279 | return NULL; | |
280 | } | |
281 | ||
a3cde449 AS |
282 | /* Callers should take appropriate locks */ |
283 | static void *get_inbuf(struct port *port) | |
284 | { | |
285 | struct port_buffer *buf; | |
286 | struct virtqueue *vq; | |
287 | unsigned int len; | |
288 | ||
289 | vq = port->in_vq; | |
290 | buf = vq->vq_ops->get_buf(vq, &len); | |
291 | if (buf) { | |
292 | buf->len = len; | |
293 | buf->offset = 0; | |
294 | } | |
295 | return buf; | |
296 | } | |
297 | ||
e27b5198 AS |
298 | /* |
299 | * Create a scatter-gather list representing our input buffer and put | |
300 | * it in the queue. | |
301 | * | |
302 | * Callers should take appropriate locks. | |
303 | */ | |
203baab8 | 304 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
305 | { |
306 | struct scatterlist sg[1]; | |
203baab8 | 307 | int ret; |
1c85bf35 | 308 | |
e27b5198 AS |
309 | sg_init_one(sg, buf->buf, buf->size); |
310 | ||
203baab8 | 311 | ret = vq->vq_ops->add_buf(vq, sg, 0, 1, buf); |
e27b5198 | 312 | vq->vq_ops->kick(vq); |
203baab8 AS |
313 | return ret; |
314 | } | |
315 | ||
316 | static bool port_has_data(struct port *port) | |
317 | { | |
318 | unsigned long flags; | |
319 | bool ret; | |
320 | ||
321 | ret = false; | |
322 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
323 | if (port->inbuf) | |
324 | ret = true; | |
325 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
326 | ||
327 | return ret; | |
328 | } | |
329 | ||
17634ba2 AS |
330 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
331 | unsigned int value) | |
332 | { | |
333 | struct scatterlist sg[1]; | |
334 | struct virtio_console_control cpkt; | |
335 | struct virtqueue *vq; | |
336 | int len; | |
337 | ||
338 | if (!use_multiport(port->portdev)) | |
339 | return 0; | |
340 | ||
341 | cpkt.id = port->id; | |
342 | cpkt.event = event; | |
343 | cpkt.value = value; | |
344 | ||
345 | vq = port->portdev->c_ovq; | |
346 | ||
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)) | |
351 | cpu_relax(); | |
352 | } | |
353 | return 0; | |
354 | } | |
355 | ||
f997f00b AS |
356 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count) |
357 | { | |
358 | struct scatterlist sg[1]; | |
359 | struct virtqueue *out_vq; | |
360 | ssize_t ret; | |
361 | unsigned int len; | |
362 | ||
363 | out_vq = port->out_vq; | |
364 | ||
365 | sg_init_one(sg, in_buf, in_count); | |
366 | ret = out_vq->vq_ops->add_buf(out_vq, sg, 1, 0, in_buf); | |
367 | ||
368 | /* Tell Host to go! */ | |
369 | out_vq->vq_ops->kick(out_vq); | |
370 | ||
371 | if (ret < 0) { | |
372 | len = 0; | |
373 | goto fail; | |
374 | } | |
375 | ||
376 | /* | |
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. | |
380 | */ | |
381 | while (!out_vq->vq_ops->get_buf(out_vq, &len)) | |
382 | cpu_relax(); | |
383 | fail: | |
384 | /* We're expected to return the amount of data we wrote */ | |
385 | return len; | |
386 | } | |
387 | ||
203baab8 AS |
388 | /* |
389 | * Give out the data that's requested from the buffer that we have | |
390 | * queued up. | |
391 | */ | |
b766ceed AS |
392 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
393 | bool to_user) | |
203baab8 AS |
394 | { |
395 | struct port_buffer *buf; | |
396 | unsigned long flags; | |
397 | ||
398 | if (!out_count || !port_has_data(port)) | |
399 | return 0; | |
400 | ||
401 | buf = port->inbuf; | |
b766ceed | 402 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 403 | |
b766ceed AS |
404 | if (to_user) { |
405 | ssize_t ret; | |
406 | ||
407 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
408 | if (ret) | |
409 | return -EFAULT; | |
410 | } else { | |
411 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
412 | } | |
203baab8 | 413 | |
203baab8 AS |
414 | buf->offset += out_count; |
415 | ||
416 | if (buf->offset == buf->len) { | |
417 | /* | |
418 | * We're done using all the data in this buffer. | |
419 | * Re-queue so that the Host can send us more data. | |
420 | */ | |
421 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
422 | port->inbuf = NULL; | |
423 | ||
424 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 425 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
426 | |
427 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
428 | } | |
b766ceed | 429 | /* Return the number of bytes actually copied */ |
203baab8 | 430 | return out_count; |
e27b5198 AS |
431 | } |
432 | ||
2030fa49 AS |
433 | /* The condition that must be true for polling to end */ |
434 | static bool wait_is_over(struct port *port) | |
435 | { | |
436 | return port_has_data(port) || !port->host_connected; | |
437 | } | |
438 | ||
439 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, | |
440 | size_t count, loff_t *offp) | |
441 | { | |
442 | struct port *port; | |
443 | ssize_t ret; | |
444 | ||
445 | port = filp->private_data; | |
446 | ||
447 | if (!port_has_data(port)) { | |
448 | /* | |
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 | |
452 | */ | |
453 | if (!port->host_connected) | |
454 | return 0; | |
455 | if (filp->f_flags & O_NONBLOCK) | |
456 | return -EAGAIN; | |
457 | ||
458 | ret = wait_event_interruptible(port->waitqueue, | |
459 | wait_is_over(port)); | |
460 | if (ret < 0) | |
461 | return ret; | |
462 | } | |
463 | /* | |
464 | * We could've received a disconnection message while we were | |
465 | * waiting for more data. | |
466 | * | |
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. | |
472 | */ | |
473 | if (!port_has_data(port) && !port->host_connected) | |
474 | return 0; | |
475 | ||
476 | return fill_readbuf(port, ubuf, count, true); | |
477 | } | |
478 | ||
479 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
480 | size_t count, loff_t *offp) | |
481 | { | |
482 | struct port *port; | |
483 | char *buf; | |
484 | ssize_t ret; | |
485 | ||
486 | port = filp->private_data; | |
487 | ||
488 | count = min((size_t)(32 * 1024), count); | |
489 | ||
490 | buf = kmalloc(count, GFP_KERNEL); | |
491 | if (!buf) | |
492 | return -ENOMEM; | |
493 | ||
494 | ret = copy_from_user(buf, ubuf, count); | |
495 | if (ret) { | |
496 | ret = -EFAULT; | |
497 | goto free_buf; | |
498 | } | |
499 | ||
500 | ret = send_buf(port, buf, count); | |
501 | free_buf: | |
502 | kfree(buf); | |
503 | return ret; | |
504 | } | |
505 | ||
506 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
507 | { | |
508 | struct port *port; | |
509 | unsigned int ret; | |
510 | ||
511 | port = filp->private_data; | |
512 | poll_wait(filp, &port->waitqueue, wait); | |
513 | ||
514 | ret = 0; | |
515 | if (port->inbuf) | |
516 | ret |= POLLIN | POLLRDNORM; | |
517 | if (port->host_connected) | |
518 | ret |= POLLOUT; | |
519 | if (!port->host_connected) | |
520 | ret |= POLLHUP; | |
521 | ||
522 | return ret; | |
523 | } | |
524 | ||
525 | static int port_fops_release(struct inode *inode, struct file *filp) | |
526 | { | |
527 | struct port *port; | |
528 | ||
529 | port = filp->private_data; | |
530 | ||
531 | /* Notify host of port being closed */ | |
532 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
533 | ||
3c7969cc AS |
534 | port->guest_connected = false; |
535 | ||
2030fa49 AS |
536 | return 0; |
537 | } | |
538 | ||
539 | static int port_fops_open(struct inode *inode, struct file *filp) | |
540 | { | |
541 | struct cdev *cdev = inode->i_cdev; | |
542 | struct port *port; | |
543 | ||
544 | port = container_of(cdev, struct port, cdev); | |
545 | filp->private_data = port; | |
546 | ||
547 | /* | |
548 | * Don't allow opening of console port devices -- that's done | |
549 | * via /dev/hvc | |
550 | */ | |
551 | if (is_console_port(port)) | |
552 | return -ENXIO; | |
553 | ||
3c7969cc AS |
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); | |
558 | return -EMFILE; | |
559 | } | |
560 | ||
561 | port->guest_connected = true; | |
562 | spin_unlock_irq(&port->inbuf_lock); | |
563 | ||
2030fa49 AS |
564 | /* Notify host of port being opened */ |
565 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | /* | |
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> | |
575 | */ | |
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, | |
583 | }; | |
584 | ||
a23ea924 RR |
585 | /* |
586 | * The put_chars() callback is pretty straightforward. | |
31610434 | 587 | * |
a23ea924 RR |
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). | |
592 | */ | |
31610434 RR |
593 | static int put_chars(u32 vtermno, const char *buf, int count) |
594 | { | |
21206ede | 595 | struct port *port; |
38edf58d AS |
596 | |
597 | port = find_port_by_vtermno(vtermno); | |
598 | if (!port) | |
599 | return 0; | |
31610434 | 600 | |
971f3390 RR |
601 | if (unlikely(early_put_chars)) |
602 | return early_put_chars(vtermno, buf, count); | |
603 | ||
f997f00b | 604 | return send_buf(port, (void *)buf, count); |
31610434 RR |
605 | } |
606 | ||
a23ea924 RR |
607 | /* |
608 | * get_chars() is the callback from the hvc_console infrastructure | |
609 | * when an interrupt is received. | |
31610434 | 610 | * |
203baab8 AS |
611 | * We call out to fill_readbuf that gets us the required data from the |
612 | * buffers that are queued up. | |
a23ea924 | 613 | */ |
31610434 RR |
614 | static int get_chars(u32 vtermno, char *buf, int count) |
615 | { | |
21206ede RR |
616 | struct port *port; |
617 | ||
38edf58d AS |
618 | port = find_port_by_vtermno(vtermno); |
619 | if (!port) | |
620 | return 0; | |
21206ede | 621 | |
31610434 | 622 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 623 | BUG_ON(!port->in_vq); |
31610434 | 624 | |
b766ceed | 625 | return fill_readbuf(port, buf, count, false); |
31610434 | 626 | } |
31610434 | 627 | |
cb06e367 | 628 | static void resize_console(struct port *port) |
c2983458 | 629 | { |
cb06e367 | 630 | struct virtio_device *vdev; |
c2983458 CB |
631 | struct winsize ws; |
632 | ||
cb06e367 AS |
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)); | |
4f23c573 | 641 | hvc_resize(port->cons.hvc, ws); |
c2983458 CB |
642 | } |
643 | } | |
644 | ||
cb06e367 AS |
645 | static void virtcons_apply_config(struct virtio_device *vdev) |
646 | { | |
647 | resize_console(find_port_by_vtermno(0)); | |
648 | } | |
649 | ||
38edf58d | 650 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
651 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
652 | { | |
38edf58d AS |
653 | struct port *port; |
654 | ||
655 | port = find_port_by_vtermno(hp->vtermno); | |
656 | if (!port) | |
657 | return -EINVAL; | |
658 | ||
91fcad19 | 659 | hp->irq_requested = 1; |
cb06e367 | 660 | resize_console(port); |
c2983458 | 661 | |
91fcad19 CB |
662 | return 0; |
663 | } | |
664 | ||
665 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
666 | { | |
667 | hp->irq_requested = 0; | |
668 | } | |
669 | ||
17634ba2 | 670 | /* The operations for console ports. */ |
1dff3996 | 671 | static const struct hv_ops hv_ops = { |
971f3390 RR |
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, | |
677 | }; | |
678 | ||
679 | /* | |
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. | |
683 | * | |
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 | |
686 | * thing. | |
687 | */ | |
688 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
689 | { | |
690 | early_put_chars = put_chars; | |
691 | return hvc_instantiate(0, 0, &hv_ops); | |
692 | } | |
693 | ||
17634ba2 | 694 | int init_port_console(struct port *port) |
cfa6d379 AS |
695 | { |
696 | int ret; | |
697 | ||
698 | /* | |
699 | * The Host's telling us this port is a console port. Hook it | |
700 | * up with an hvc console. | |
701 | * | |
702 | * To set up and manage our virtual console, we call | |
703 | * hvc_alloc(). | |
704 | * | |
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. | |
709 | * | |
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. | |
714 | */ | |
715 | port->cons.vtermno = pdrvdata.next_vtermno; | |
716 | ||
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; | |
721 | return ret; | |
722 | } | |
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); | |
3c7969cc | 727 | port->guest_connected = true; |
cfa6d379 | 728 | |
2030fa49 AS |
729 | /* Notify host of port being opened */ |
730 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
731 | ||
cfa6d379 AS |
732 | return 0; |
733 | } | |
734 | ||
17634ba2 AS |
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) | |
738 | { | |
739 | struct virtio_console_control *cpkt; | |
740 | struct port *port; | |
741 | ||
742 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
743 | ||
744 | port = find_port_by_id(portdev, cpkt->id); | |
745 | if (!port) { | |
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); | |
749 | return; | |
750 | } | |
751 | ||
752 | switch (cpkt->event) { | |
753 | case VIRTIO_CONSOLE_CONSOLE_PORT: | |
754 | if (!cpkt->value) | |
755 | break; | |
756 | if (is_console_port(port)) | |
757 | break; | |
758 | ||
759 | init_port_console(port); | |
760 | /* | |
761 | * Could remove the port here in case init fails - but | |
762 | * have to notify the host first. | |
763 | */ | |
764 | break; | |
765 | case VIRTIO_CONSOLE_RESIZE: | |
766 | if (!is_console_port(port)) | |
767 | break; | |
768 | port->cons.hvc->irq_requested = 1; | |
769 | resize_console(port); | |
770 | break; | |
2030fa49 AS |
771 | case VIRTIO_CONSOLE_PORT_OPEN: |
772 | port->host_connected = cpkt->value; | |
773 | wake_up_interruptible(&port->waitqueue); | |
774 | break; | |
17634ba2 AS |
775 | } |
776 | } | |
777 | ||
778 | static void control_work_handler(struct work_struct *work) | |
779 | { | |
780 | struct ports_device *portdev; | |
781 | struct virtqueue *vq; | |
782 | struct port_buffer *buf; | |
783 | unsigned int len; | |
784 | ||
785 | portdev = container_of(work, struct ports_device, control_work); | |
786 | vq = portdev->c_ivq; | |
787 | ||
788 | spin_lock(&portdev->cvq_lock); | |
789 | while ((buf = vq->vq_ops->get_buf(vq, &len))) { | |
790 | spin_unlock(&portdev->cvq_lock); | |
791 | ||
792 | buf->len = len; | |
793 | buf->offset = 0; | |
794 | ||
795 | handle_control_message(portdev, buf); | |
796 | ||
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"); | |
801 | free_buf(buf); | |
802 | } | |
803 | } | |
804 | spin_unlock(&portdev->cvq_lock); | |
805 | } | |
806 | ||
807 | static void in_intr(struct virtqueue *vq) | |
808 | { | |
809 | struct port *port; | |
810 | unsigned long flags; | |
811 | ||
812 | port = find_port_by_vq(vq->vdev->priv, vq); | |
813 | if (!port) | |
814 | return; | |
815 | ||
816 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
817 | port->inbuf = get_inbuf(port); | |
818 | ||
819 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
820 | ||
2030fa49 AS |
821 | wake_up_interruptible(&port->waitqueue); |
822 | ||
17634ba2 AS |
823 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
824 | hvc_kick(); | |
825 | } | |
826 | ||
827 | static void control_intr(struct virtqueue *vq) | |
828 | { | |
829 | struct ports_device *portdev; | |
830 | ||
831 | portdev = vq->vdev->priv; | |
832 | schedule_work(&portdev->control_work); | |
833 | } | |
834 | ||
835 | static void fill_queue(struct virtqueue *vq, spinlock_t *lock) | |
836 | { | |
837 | struct port_buffer *buf; | |
838 | int ret; | |
839 | ||
840 | do { | |
841 | buf = alloc_buf(PAGE_SIZE); | |
842 | if (!buf) | |
843 | break; | |
844 | ||
845 | spin_lock_irq(lock); | |
846 | ret = add_inbuf(vq, buf); | |
847 | if (ret < 0) { | |
848 | spin_unlock_irq(lock); | |
849 | free_buf(buf); | |
850 | break; | |
851 | } | |
852 | spin_unlock_irq(lock); | |
853 | } while (ret > 0); | |
854 | } | |
855 | ||
856 | static int add_port(struct ports_device *portdev, u32 id) | |
d8a02bd5 | 857 | { |
21206ede | 858 | struct port *port; |
203baab8 | 859 | struct port_buffer *inbuf; |
fb08bd27 | 860 | dev_t devt; |
31610434 | 861 | int err; |
31610434 | 862 | |
1c85bf35 | 863 | port = kmalloc(sizeof(*port), GFP_KERNEL); |
d8a02bd5 RR |
864 | if (!port) { |
865 | err = -ENOMEM; | |
866 | goto fail; | |
f550804a | 867 | } |
73954488 | 868 | |
1c85bf35 | 869 | port->portdev = portdev; |
17634ba2 | 870 | port->id = id; |
203baab8 AS |
871 | |
872 | port->inbuf = NULL; | |
17634ba2 | 873 | port->cons.hvc = NULL; |
203baab8 | 874 | |
3c7969cc | 875 | port->host_connected = port->guest_connected = false; |
2030fa49 | 876 | |
17634ba2 AS |
877 | port->in_vq = portdev->in_vqs[port->id]; |
878 | port->out_vq = portdev->out_vqs[port->id]; | |
31610434 | 879 | |
2030fa49 | 880 | cdev_init(&port->cdev, &port_fops); |
fb08bd27 AS |
881 | |
882 | devt = MKDEV(portdev->chr_major, id); | |
883 | err = cdev_add(&port->cdev, devt, 1); | |
884 | if (err < 0) { | |
885 | dev_err(&port->portdev->vdev->dev, | |
886 | "Error %d adding cdev for port %u\n", err, id); | |
887 | goto free_port; | |
888 | } | |
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", | |
896 | err, id); | |
897 | goto free_cdev; | |
898 | } | |
899 | ||
203baab8 | 900 | spin_lock_init(&port->inbuf_lock); |
2030fa49 | 901 | init_waitqueue_head(&port->waitqueue); |
203baab8 AS |
902 | |
903 | inbuf = alloc_buf(PAGE_SIZE); | |
904 | if (!inbuf) { | |
1c85bf35 | 905 | err = -ENOMEM; |
fb08bd27 | 906 | goto free_device; |
1c85bf35 | 907 | } |
31610434 | 908 | |
203baab8 AS |
909 | /* Register the input buffer the first time. */ |
910 | add_inbuf(port->in_vq, inbuf); | |
911 | ||
17634ba2 AS |
912 | /* |
913 | * If we're not using multiport support, this has to be a console port | |
914 | */ | |
915 | if (!use_multiport(port->portdev)) { | |
916 | err = init_port_console(port); | |
917 | if (err) | |
918 | goto free_inbuf; | |
919 | } | |
920 | ||
921 | spin_lock_irq(&portdev->ports_lock); | |
922 | list_add_tail(&port->list, &port->portdev->ports); | |
923 | spin_unlock_irq(&portdev->ports_lock); | |
924 | ||
925 | /* | |
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.) | |
929 | */ | |
930 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
38edf58d | 931 | |
1c85bf35 AS |
932 | return 0; |
933 | ||
934 | free_inbuf: | |
203baab8 | 935 | free_buf(inbuf); |
fb08bd27 AS |
936 | free_device: |
937 | device_destroy(pdrvdata.class, port->dev->devt); | |
938 | free_cdev: | |
939 | cdev_del(&port->cdev); | |
1c85bf35 AS |
940 | free_port: |
941 | kfree(port); | |
942 | fail: | |
943 | return err; | |
944 | } | |
945 | ||
2658a79a AS |
946 | static int init_vqs(struct ports_device *portdev) |
947 | { | |
948 | vq_callback_t **io_callbacks; | |
949 | char **io_names; | |
950 | struct virtqueue **vqs; | |
17634ba2 | 951 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
952 | int err; |
953 | ||
17634ba2 AS |
954 | nr_ports = portdev->config.max_nr_ports; |
955 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
956 | |
957 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
958 | if (!vqs) { | |
959 | err = -ENOMEM; | |
960 | goto fail; | |
961 | } | |
962 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); | |
963 | if (!io_callbacks) { | |
964 | err = -ENOMEM; | |
965 | goto free_vqs; | |
966 | } | |
967 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); | |
968 | if (!io_names) { | |
969 | err = -ENOMEM; | |
970 | goto free_callbacks; | |
971 | } | |
972 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
973 | GFP_KERNEL); | |
974 | if (!portdev->in_vqs) { | |
975 | err = -ENOMEM; | |
976 | goto free_names; | |
977 | } | |
978 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
979 | GFP_KERNEL); | |
980 | if (!portdev->out_vqs) { | |
981 | err = -ENOMEM; | |
982 | goto free_invqs; | |
983 | } | |
984 | ||
17634ba2 AS |
985 | /* |
986 | * For backward compat (newer host but older guest), the host | |
987 | * spawns a console port first and also inits the vqs for port | |
988 | * 0 before others. | |
989 | */ | |
990 | j = 0; | |
991 | io_callbacks[j] = in_intr; | |
992 | io_callbacks[j + 1] = NULL; | |
993 | io_names[j] = "input"; | |
994 | io_names[j + 1] = "output"; | |
995 | j += 2; | |
996 | ||
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"; | |
1002 | ||
1003 | for (i = 1; i < nr_ports; i++) { | |
1004 | j += 2; | |
1005 | io_callbacks[j] = in_intr; | |
1006 | io_callbacks[j + 1] = NULL; | |
1007 | io_names[j] = "input"; | |
1008 | io_names[j + 1] = "output"; | |
1009 | } | |
1010 | } | |
2658a79a AS |
1011 | /* Find the queues. */ |
1012 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1013 | io_callbacks, | |
1014 | (const char **)io_names); | |
1015 | if (err) | |
1016 | goto free_outvqs; | |
1017 | ||
17634ba2 | 1018 | j = 0; |
2658a79a AS |
1019 | portdev->in_vqs[0] = vqs[0]; |
1020 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1021 | j += 2; |
1022 | if (use_multiport(portdev)) { | |
1023 | portdev->c_ivq = vqs[j]; | |
1024 | portdev->c_ovq = vqs[j + 1]; | |
1025 | ||
1026 | for (i = 1; i < nr_ports; i++) { | |
1027 | j += 2; | |
1028 | portdev->in_vqs[i] = vqs[j]; | |
1029 | portdev->out_vqs[i] = vqs[j + 1]; | |
1030 | } | |
1031 | } | |
2658a79a AS |
1032 | kfree(io_callbacks); |
1033 | kfree(io_names); | |
1034 | kfree(vqs); | |
1035 | ||
1036 | return 0; | |
1037 | ||
1038 | free_names: | |
1039 | kfree(io_names); | |
1040 | free_callbacks: | |
1041 | kfree(io_callbacks); | |
1042 | free_outvqs: | |
1043 | kfree(portdev->out_vqs); | |
1044 | free_invqs: | |
1045 | kfree(portdev->in_vqs); | |
1046 | free_vqs: | |
1047 | kfree(vqs); | |
1048 | fail: | |
1049 | return err; | |
1050 | } | |
1051 | ||
fb08bd27 AS |
1052 | static const struct file_operations portdev_fops = { |
1053 | .owner = THIS_MODULE, | |
1054 | }; | |
1055 | ||
1c85bf35 AS |
1056 | /* |
1057 | * Once we're further in boot, we get probed like any other virtio | |
1058 | * device. | |
17634ba2 AS |
1059 | * |
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. | |
1c85bf35 AS |
1063 | */ |
1064 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1065 | { | |
1c85bf35 | 1066 | struct ports_device *portdev; |
17634ba2 | 1067 | u32 i; |
1c85bf35 | 1068 | int err; |
17634ba2 | 1069 | bool multiport; |
1c85bf35 AS |
1070 | |
1071 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1072 | if (!portdev) { | |
1073 | err = -ENOMEM; | |
1074 | goto fail; | |
1075 | } | |
1076 | ||
1077 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1078 | portdev->vdev = vdev; | |
1079 | vdev->priv = portdev; | |
1080 | ||
fb08bd27 AS |
1081 | spin_lock_irq(&pdrvdata_lock); |
1082 | portdev->drv_index = pdrvdata.index++; | |
1083 | spin_unlock_irq(&pdrvdata_lock); | |
1084 | ||
1085 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1086 | &portdev_fops); | |
1087 | if (portdev->chr_major < 0) { | |
1088 | dev_err(&vdev->dev, | |
1089 | "Error %d registering chrdev for device %u\n", | |
1090 | portdev->chr_major, portdev->drv_index); | |
1091 | err = portdev->chr_major; | |
1092 | goto free; | |
1093 | } | |
1094 | ||
17634ba2 AS |
1095 | multiport = false; |
1096 | portdev->config.nr_ports = 1; | |
1097 | portdev->config.max_nr_ports = 1; | |
1098 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { | |
1099 | multiport = true; | |
1100 | vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; | |
1101 | ||
1102 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1103 | nr_ports), | |
1104 | &portdev->config.nr_ports, | |
1105 | sizeof(portdev->config.nr_ports)); | |
1106 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1107 | max_nr_ports), | |
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); | |
1116 | ||
1117 | portdev->config.nr_ports = portdev->config.max_nr_ports; | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | /* Let the Host know we support multiple ports.*/ | |
1122 | vdev->config->finalize_features(vdev); | |
1123 | ||
2658a79a AS |
1124 | err = init_vqs(portdev); |
1125 | if (err < 0) { | |
1126 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1127 | goto free_chrdev; |
2658a79a | 1128 | } |
1c85bf35 | 1129 | |
17634ba2 AS |
1130 | spin_lock_init(&portdev->ports_lock); |
1131 | INIT_LIST_HEAD(&portdev->ports); | |
1132 | ||
1133 | if (multiport) { | |
1134 | spin_lock_init(&portdev->cvq_lock); | |
1135 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
1136 | ||
1137 | fill_queue(portdev->c_ivq, &portdev->cvq_lock); | |
1138 | } | |
1139 | ||
1140 | for (i = 0; i < portdev->config.nr_ports; i++) | |
1141 | add_port(portdev, i); | |
1c85bf35 | 1142 | |
971f3390 RR |
1143 | /* Start using the new console output. */ |
1144 | early_put_chars = NULL; | |
31610434 RR |
1145 | return 0; |
1146 | ||
fb08bd27 AS |
1147 | free_chrdev: |
1148 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1149 | free: |
1c85bf35 | 1150 | kfree(portdev); |
31610434 RR |
1151 | fail: |
1152 | return err; | |
1153 | } | |
1154 | ||
1155 | static struct virtio_device_id id_table[] = { | |
1156 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1157 | { 0 }, | |
1158 | }; | |
1159 | ||
c2983458 CB |
1160 | static unsigned int features[] = { |
1161 | VIRTIO_CONSOLE_F_SIZE, | |
17634ba2 | 1162 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1163 | }; |
1164 | ||
31610434 | 1165 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1166 | .feature_table = features, |
1167 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1168 | .driver.name = KBUILD_MODNAME, |
1169 | .driver.owner = THIS_MODULE, | |
1170 | .id_table = id_table, | |
1171 | .probe = virtcons_probe, | |
c2983458 | 1172 | .config_changed = virtcons_apply_config, |
31610434 RR |
1173 | }; |
1174 | ||
1175 | static int __init init(void) | |
1176 | { | |
fb08bd27 AS |
1177 | int err; |
1178 | ||
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); | |
1183 | return err; | |
1184 | } | |
38edf58d AS |
1185 | INIT_LIST_HEAD(&pdrvdata.consoles); |
1186 | ||
31610434 RR |
1187 | return register_virtio_driver(&virtio_console); |
1188 | } | |
1189 | module_init(init); | |
1190 | ||
1191 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1192 | MODULE_DESCRIPTION("Virtio console driver"); | |
1193 | MODULE_LICENSE("GPL"); |