Commit | Line | Data |
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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 | ||
431edb8a AS |
173 | /* The 'name' of the port that we expose via sysfs properties */ |
174 | char *name; | |
175 | ||
17634ba2 AS |
176 | /* The 'id' to identify the port with the Host */ |
177 | u32 id; | |
2030fa49 AS |
178 | |
179 | /* Is the host device open */ | |
180 | bool host_connected; | |
3c7969cc AS |
181 | |
182 | /* We should allow only one process to open a port */ | |
183 | bool guest_connected; | |
21206ede | 184 | }; |
31610434 | 185 | |
971f3390 RR |
186 | /* This is the very early arch-specified put chars function. */ |
187 | static int (*early_put_chars)(u32, const char *, int); | |
188 | ||
38edf58d AS |
189 | static struct port *find_port_by_vtermno(u32 vtermno) |
190 | { | |
191 | struct port *port; | |
4f23c573 | 192 | struct console *cons; |
38edf58d AS |
193 | unsigned long flags; |
194 | ||
195 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
196 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
197 | if (cons->vtermno == vtermno) { | |
198 | port = container_of(cons, struct port, cons); | |
38edf58d | 199 | goto out; |
4f23c573 | 200 | } |
38edf58d AS |
201 | } |
202 | port = NULL; | |
203 | out: | |
204 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
205 | return port; | |
206 | } | |
207 | ||
17634ba2 AS |
208 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
209 | { | |
210 | struct port *port; | |
211 | unsigned long flags; | |
212 | ||
213 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
214 | list_for_each_entry(port, &portdev->ports, list) | |
215 | if (port->id == id) | |
216 | goto out; | |
217 | port = NULL; | |
218 | out: | |
219 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
220 | ||
221 | return port; | |
222 | } | |
223 | ||
203baab8 AS |
224 | static struct port *find_port_by_vq(struct ports_device *portdev, |
225 | struct virtqueue *vq) | |
226 | { | |
227 | struct port *port; | |
203baab8 AS |
228 | unsigned long flags; |
229 | ||
17634ba2 AS |
230 | spin_lock_irqsave(&portdev->ports_lock, flags); |
231 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
232 | if (port->in_vq == vq || port->out_vq == vq) |
233 | goto out; | |
203baab8 AS |
234 | port = NULL; |
235 | out: | |
17634ba2 | 236 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
237 | return port; |
238 | } | |
239 | ||
17634ba2 AS |
240 | static bool is_console_port(struct port *port) |
241 | { | |
242 | if (port->cons.hvc) | |
243 | return true; | |
244 | return false; | |
245 | } | |
246 | ||
247 | static inline bool use_multiport(struct ports_device *portdev) | |
248 | { | |
249 | /* | |
250 | * This condition can be true when put_chars is called from | |
251 | * early_init | |
252 | */ | |
253 | if (!portdev->vdev) | |
254 | return 0; | |
255 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
256 | } | |
257 | ||
fdb9a054 AS |
258 | static void free_buf(struct port_buffer *buf) |
259 | { | |
260 | kfree(buf->buf); | |
261 | kfree(buf); | |
262 | } | |
263 | ||
264 | static struct port_buffer *alloc_buf(size_t buf_size) | |
265 | { | |
266 | struct port_buffer *buf; | |
267 | ||
268 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
269 | if (!buf) | |
270 | goto fail; | |
271 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
272 | if (!buf->buf) | |
273 | goto free_buf; | |
274 | buf->len = 0; | |
275 | buf->offset = 0; | |
276 | buf->size = buf_size; | |
277 | return buf; | |
278 | ||
279 | free_buf: | |
280 | kfree(buf); | |
281 | fail: | |
282 | return NULL; | |
283 | } | |
284 | ||
a3cde449 AS |
285 | /* Callers should take appropriate locks */ |
286 | static void *get_inbuf(struct port *port) | |
287 | { | |
288 | struct port_buffer *buf; | |
289 | struct virtqueue *vq; | |
290 | unsigned int len; | |
291 | ||
292 | vq = port->in_vq; | |
293 | buf = vq->vq_ops->get_buf(vq, &len); | |
294 | if (buf) { | |
295 | buf->len = len; | |
296 | buf->offset = 0; | |
297 | } | |
298 | return buf; | |
299 | } | |
300 | ||
e27b5198 AS |
301 | /* |
302 | * Create a scatter-gather list representing our input buffer and put | |
303 | * it in the queue. | |
304 | * | |
305 | * Callers should take appropriate locks. | |
306 | */ | |
203baab8 | 307 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
308 | { |
309 | struct scatterlist sg[1]; | |
203baab8 | 310 | int ret; |
1c85bf35 | 311 | |
e27b5198 AS |
312 | sg_init_one(sg, buf->buf, buf->size); |
313 | ||
203baab8 | 314 | ret = vq->vq_ops->add_buf(vq, sg, 0, 1, buf); |
e27b5198 | 315 | vq->vq_ops->kick(vq); |
203baab8 AS |
316 | return ret; |
317 | } | |
318 | ||
319 | static bool port_has_data(struct port *port) | |
320 | { | |
321 | unsigned long flags; | |
322 | bool ret; | |
323 | ||
324 | ret = false; | |
325 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
326 | if (port->inbuf) | |
327 | ret = true; | |
328 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
329 | ||
330 | return ret; | |
331 | } | |
332 | ||
17634ba2 AS |
333 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
334 | unsigned int value) | |
335 | { | |
336 | struct scatterlist sg[1]; | |
337 | struct virtio_console_control cpkt; | |
338 | struct virtqueue *vq; | |
339 | int len; | |
340 | ||
341 | if (!use_multiport(port->portdev)) | |
342 | return 0; | |
343 | ||
344 | cpkt.id = port->id; | |
345 | cpkt.event = event; | |
346 | cpkt.value = value; | |
347 | ||
348 | vq = port->portdev->c_ovq; | |
349 | ||
350 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
351 | if (vq->vq_ops->add_buf(vq, sg, 1, 0, &cpkt) >= 0) { | |
352 | vq->vq_ops->kick(vq); | |
353 | while (!vq->vq_ops->get_buf(vq, &len)) | |
354 | cpu_relax(); | |
355 | } | |
356 | return 0; | |
357 | } | |
358 | ||
f997f00b AS |
359 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count) |
360 | { | |
361 | struct scatterlist sg[1]; | |
362 | struct virtqueue *out_vq; | |
363 | ssize_t ret; | |
364 | unsigned int len; | |
365 | ||
366 | out_vq = port->out_vq; | |
367 | ||
368 | sg_init_one(sg, in_buf, in_count); | |
369 | ret = out_vq->vq_ops->add_buf(out_vq, sg, 1, 0, in_buf); | |
370 | ||
371 | /* Tell Host to go! */ | |
372 | out_vq->vq_ops->kick(out_vq); | |
373 | ||
374 | if (ret < 0) { | |
375 | len = 0; | |
376 | goto fail; | |
377 | } | |
378 | ||
379 | /* | |
380 | * Wait till the host acknowledges it pushed out the data we | |
381 | * sent. Also ensure we return to userspace the number of | |
382 | * bytes that were successfully consumed by the host. | |
383 | */ | |
384 | while (!out_vq->vq_ops->get_buf(out_vq, &len)) | |
385 | cpu_relax(); | |
386 | fail: | |
387 | /* We're expected to return the amount of data we wrote */ | |
388 | return len; | |
389 | } | |
390 | ||
203baab8 AS |
391 | /* |
392 | * Give out the data that's requested from the buffer that we have | |
393 | * queued up. | |
394 | */ | |
b766ceed AS |
395 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
396 | bool to_user) | |
203baab8 AS |
397 | { |
398 | struct port_buffer *buf; | |
399 | unsigned long flags; | |
400 | ||
401 | if (!out_count || !port_has_data(port)) | |
402 | return 0; | |
403 | ||
404 | buf = port->inbuf; | |
b766ceed | 405 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 406 | |
b766ceed AS |
407 | if (to_user) { |
408 | ssize_t ret; | |
409 | ||
410 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
411 | if (ret) | |
412 | return -EFAULT; | |
413 | } else { | |
414 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
415 | } | |
203baab8 | 416 | |
203baab8 AS |
417 | buf->offset += out_count; |
418 | ||
419 | if (buf->offset == buf->len) { | |
420 | /* | |
421 | * We're done using all the data in this buffer. | |
422 | * Re-queue so that the Host can send us more data. | |
423 | */ | |
424 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
425 | port->inbuf = NULL; | |
426 | ||
427 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 428 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
429 | |
430 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
431 | } | |
b766ceed | 432 | /* Return the number of bytes actually copied */ |
203baab8 | 433 | return out_count; |
e27b5198 AS |
434 | } |
435 | ||
2030fa49 AS |
436 | /* The condition that must be true for polling to end */ |
437 | static bool wait_is_over(struct port *port) | |
438 | { | |
439 | return port_has_data(port) || !port->host_connected; | |
440 | } | |
441 | ||
442 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, | |
443 | size_t count, loff_t *offp) | |
444 | { | |
445 | struct port *port; | |
446 | ssize_t ret; | |
447 | ||
448 | port = filp->private_data; | |
449 | ||
450 | if (!port_has_data(port)) { | |
451 | /* | |
452 | * If nothing's connected on the host just return 0 in | |
453 | * case of list_empty; this tells the userspace app | |
454 | * that there's no connection | |
455 | */ | |
456 | if (!port->host_connected) | |
457 | return 0; | |
458 | if (filp->f_flags & O_NONBLOCK) | |
459 | return -EAGAIN; | |
460 | ||
461 | ret = wait_event_interruptible(port->waitqueue, | |
462 | wait_is_over(port)); | |
463 | if (ret < 0) | |
464 | return ret; | |
465 | } | |
466 | /* | |
467 | * We could've received a disconnection message while we were | |
468 | * waiting for more data. | |
469 | * | |
470 | * This check is not clubbed in the if() statement above as we | |
471 | * might receive some data as well as the host could get | |
472 | * disconnected after we got woken up from our wait. So we | |
473 | * really want to give off whatever data we have and only then | |
474 | * check for host_connected. | |
475 | */ | |
476 | if (!port_has_data(port) && !port->host_connected) | |
477 | return 0; | |
478 | ||
479 | return fill_readbuf(port, ubuf, count, true); | |
480 | } | |
481 | ||
482 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
483 | size_t count, loff_t *offp) | |
484 | { | |
485 | struct port *port; | |
486 | char *buf; | |
487 | ssize_t ret; | |
488 | ||
489 | port = filp->private_data; | |
490 | ||
491 | count = min((size_t)(32 * 1024), count); | |
492 | ||
493 | buf = kmalloc(count, GFP_KERNEL); | |
494 | if (!buf) | |
495 | return -ENOMEM; | |
496 | ||
497 | ret = copy_from_user(buf, ubuf, count); | |
498 | if (ret) { | |
499 | ret = -EFAULT; | |
500 | goto free_buf; | |
501 | } | |
502 | ||
503 | ret = send_buf(port, buf, count); | |
504 | free_buf: | |
505 | kfree(buf); | |
506 | return ret; | |
507 | } | |
508 | ||
509 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
510 | { | |
511 | struct port *port; | |
512 | unsigned int ret; | |
513 | ||
514 | port = filp->private_data; | |
515 | poll_wait(filp, &port->waitqueue, wait); | |
516 | ||
517 | ret = 0; | |
518 | if (port->inbuf) | |
519 | ret |= POLLIN | POLLRDNORM; | |
520 | if (port->host_connected) | |
521 | ret |= POLLOUT; | |
522 | if (!port->host_connected) | |
523 | ret |= POLLHUP; | |
524 | ||
525 | return ret; | |
526 | } | |
527 | ||
528 | static int port_fops_release(struct inode *inode, struct file *filp) | |
529 | { | |
530 | struct port *port; | |
531 | ||
532 | port = filp->private_data; | |
533 | ||
534 | /* Notify host of port being closed */ | |
535 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
536 | ||
3c7969cc AS |
537 | port->guest_connected = false; |
538 | ||
2030fa49 AS |
539 | return 0; |
540 | } | |
541 | ||
542 | static int port_fops_open(struct inode *inode, struct file *filp) | |
543 | { | |
544 | struct cdev *cdev = inode->i_cdev; | |
545 | struct port *port; | |
546 | ||
547 | port = container_of(cdev, struct port, cdev); | |
548 | filp->private_data = port; | |
549 | ||
550 | /* | |
551 | * Don't allow opening of console port devices -- that's done | |
552 | * via /dev/hvc | |
553 | */ | |
554 | if (is_console_port(port)) | |
555 | return -ENXIO; | |
556 | ||
3c7969cc AS |
557 | /* Allow only one process to open a particular port at a time */ |
558 | spin_lock_irq(&port->inbuf_lock); | |
559 | if (port->guest_connected) { | |
560 | spin_unlock_irq(&port->inbuf_lock); | |
561 | return -EMFILE; | |
562 | } | |
563 | ||
564 | port->guest_connected = true; | |
565 | spin_unlock_irq(&port->inbuf_lock); | |
566 | ||
2030fa49 AS |
567 | /* Notify host of port being opened */ |
568 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | /* | |
574 | * The file operations that we support: programs in the guest can open | |
575 | * a console device, read from it, write to it, poll for data and | |
576 | * close it. The devices are at | |
577 | * /dev/vport<device number>p<port number> | |
578 | */ | |
579 | static const struct file_operations port_fops = { | |
580 | .owner = THIS_MODULE, | |
581 | .open = port_fops_open, | |
582 | .read = port_fops_read, | |
583 | .write = port_fops_write, | |
584 | .poll = port_fops_poll, | |
585 | .release = port_fops_release, | |
586 | }; | |
587 | ||
a23ea924 RR |
588 | /* |
589 | * The put_chars() callback is pretty straightforward. | |
31610434 | 590 | * |
a23ea924 RR |
591 | * We turn the characters into a scatter-gather list, add it to the |
592 | * output queue and then kick the Host. Then we sit here waiting for | |
593 | * it to finish: inefficient in theory, but in practice | |
594 | * implementations will do it immediately (lguest's Launcher does). | |
595 | */ | |
31610434 RR |
596 | static int put_chars(u32 vtermno, const char *buf, int count) |
597 | { | |
21206ede | 598 | struct port *port; |
38edf58d AS |
599 | |
600 | port = find_port_by_vtermno(vtermno); | |
601 | if (!port) | |
602 | return 0; | |
31610434 | 603 | |
971f3390 RR |
604 | if (unlikely(early_put_chars)) |
605 | return early_put_chars(vtermno, buf, count); | |
606 | ||
f997f00b | 607 | return send_buf(port, (void *)buf, count); |
31610434 RR |
608 | } |
609 | ||
a23ea924 RR |
610 | /* |
611 | * get_chars() is the callback from the hvc_console infrastructure | |
612 | * when an interrupt is received. | |
31610434 | 613 | * |
203baab8 AS |
614 | * We call out to fill_readbuf that gets us the required data from the |
615 | * buffers that are queued up. | |
a23ea924 | 616 | */ |
31610434 RR |
617 | static int get_chars(u32 vtermno, char *buf, int count) |
618 | { | |
21206ede RR |
619 | struct port *port; |
620 | ||
38edf58d AS |
621 | port = find_port_by_vtermno(vtermno); |
622 | if (!port) | |
623 | return 0; | |
21206ede | 624 | |
31610434 | 625 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 626 | BUG_ON(!port->in_vq); |
31610434 | 627 | |
b766ceed | 628 | return fill_readbuf(port, buf, count, false); |
31610434 | 629 | } |
31610434 | 630 | |
cb06e367 | 631 | static void resize_console(struct port *port) |
c2983458 | 632 | { |
cb06e367 | 633 | struct virtio_device *vdev; |
c2983458 CB |
634 | struct winsize ws; |
635 | ||
cb06e367 AS |
636 | vdev = port->portdev->vdev; |
637 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) { | |
638 | vdev->config->get(vdev, | |
639 | offsetof(struct virtio_console_config, cols), | |
640 | &ws.ws_col, sizeof(u16)); | |
641 | vdev->config->get(vdev, | |
642 | offsetof(struct virtio_console_config, rows), | |
643 | &ws.ws_row, sizeof(u16)); | |
4f23c573 | 644 | hvc_resize(port->cons.hvc, ws); |
c2983458 CB |
645 | } |
646 | } | |
647 | ||
cb06e367 AS |
648 | static void virtcons_apply_config(struct virtio_device *vdev) |
649 | { | |
650 | resize_console(find_port_by_vtermno(0)); | |
651 | } | |
652 | ||
38edf58d | 653 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
654 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
655 | { | |
38edf58d AS |
656 | struct port *port; |
657 | ||
658 | port = find_port_by_vtermno(hp->vtermno); | |
659 | if (!port) | |
660 | return -EINVAL; | |
661 | ||
91fcad19 | 662 | hp->irq_requested = 1; |
cb06e367 | 663 | resize_console(port); |
c2983458 | 664 | |
91fcad19 CB |
665 | return 0; |
666 | } | |
667 | ||
668 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
669 | { | |
670 | hp->irq_requested = 0; | |
671 | } | |
672 | ||
17634ba2 | 673 | /* The operations for console ports. */ |
1dff3996 | 674 | static const struct hv_ops hv_ops = { |
971f3390 RR |
675 | .get_chars = get_chars, |
676 | .put_chars = put_chars, | |
677 | .notifier_add = notifier_add_vio, | |
678 | .notifier_del = notifier_del_vio, | |
679 | .notifier_hangup = notifier_del_vio, | |
680 | }; | |
681 | ||
682 | /* | |
683 | * Console drivers are initialized very early so boot messages can go | |
684 | * out, so we do things slightly differently from the generic virtio | |
685 | * initialization of the net and block drivers. | |
686 | * | |
687 | * At this stage, the console is output-only. It's too early to set | |
688 | * up a virtqueue, so we let the drivers do some boutique early-output | |
689 | * thing. | |
690 | */ | |
691 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
692 | { | |
693 | early_put_chars = put_chars; | |
694 | return hvc_instantiate(0, 0, &hv_ops); | |
695 | } | |
696 | ||
17634ba2 | 697 | int init_port_console(struct port *port) |
cfa6d379 AS |
698 | { |
699 | int ret; | |
700 | ||
701 | /* | |
702 | * The Host's telling us this port is a console port. Hook it | |
703 | * up with an hvc console. | |
704 | * | |
705 | * To set up and manage our virtual console, we call | |
706 | * hvc_alloc(). | |
707 | * | |
708 | * The first argument of hvc_alloc() is the virtual console | |
709 | * number. The second argument is the parameter for the | |
710 | * notification mechanism (like irq number). We currently | |
711 | * leave this as zero, virtqueues have implicit notifications. | |
712 | * | |
713 | * The third argument is a "struct hv_ops" containing the | |
714 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
715 | * pointers. The final argument is the output buffer size: we | |
716 | * can do any size, so we put PAGE_SIZE here. | |
717 | */ | |
718 | port->cons.vtermno = pdrvdata.next_vtermno; | |
719 | ||
720 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
721 | if (IS_ERR(port->cons.hvc)) { | |
722 | ret = PTR_ERR(port->cons.hvc); | |
723 | port->cons.hvc = NULL; | |
724 | return ret; | |
725 | } | |
726 | spin_lock_irq(&pdrvdata_lock); | |
727 | pdrvdata.next_vtermno++; | |
728 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
729 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 730 | port->guest_connected = true; |
cfa6d379 | 731 | |
2030fa49 AS |
732 | /* Notify host of port being opened */ |
733 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
734 | ||
cfa6d379 AS |
735 | return 0; |
736 | } | |
737 | ||
431edb8a AS |
738 | static ssize_t show_port_name(struct device *dev, |
739 | struct device_attribute *attr, char *buffer) | |
740 | { | |
741 | struct port *port; | |
742 | ||
743 | port = dev_get_drvdata(dev); | |
744 | ||
745 | return sprintf(buffer, "%s\n", port->name); | |
746 | } | |
747 | ||
748 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
749 | ||
750 | static struct attribute *port_sysfs_entries[] = { | |
751 | &dev_attr_name.attr, | |
752 | NULL | |
753 | }; | |
754 | ||
755 | static struct attribute_group port_attribute_group = { | |
756 | .name = NULL, /* put in device directory */ | |
757 | .attrs = port_sysfs_entries, | |
758 | }; | |
759 | ||
17634ba2 AS |
760 | /* Any private messages that the Host and Guest want to share */ |
761 | static void handle_control_message(struct ports_device *portdev, | |
762 | struct port_buffer *buf) | |
763 | { | |
764 | struct virtio_console_control *cpkt; | |
765 | struct port *port; | |
431edb8a AS |
766 | size_t name_size; |
767 | int err; | |
17634ba2 AS |
768 | |
769 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
770 | ||
771 | port = find_port_by_id(portdev, cpkt->id); | |
772 | if (!port) { | |
773 | /* No valid header at start of buffer. Drop it. */ | |
774 | dev_dbg(&portdev->vdev->dev, | |
775 | "Invalid index %u in control packet\n", cpkt->id); | |
776 | return; | |
777 | } | |
778 | ||
779 | switch (cpkt->event) { | |
780 | case VIRTIO_CONSOLE_CONSOLE_PORT: | |
781 | if (!cpkt->value) | |
782 | break; | |
783 | if (is_console_port(port)) | |
784 | break; | |
785 | ||
786 | init_port_console(port); | |
787 | /* | |
788 | * Could remove the port here in case init fails - but | |
789 | * have to notify the host first. | |
790 | */ | |
791 | break; | |
792 | case VIRTIO_CONSOLE_RESIZE: | |
793 | if (!is_console_port(port)) | |
794 | break; | |
795 | port->cons.hvc->irq_requested = 1; | |
796 | resize_console(port); | |
797 | break; | |
2030fa49 AS |
798 | case VIRTIO_CONSOLE_PORT_OPEN: |
799 | port->host_connected = cpkt->value; | |
800 | wake_up_interruptible(&port->waitqueue); | |
801 | break; | |
431edb8a AS |
802 | case VIRTIO_CONSOLE_PORT_NAME: |
803 | /* | |
804 | * Skip the size of the header and the cpkt to get the size | |
805 | * of the name that was sent | |
806 | */ | |
807 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
808 | ||
809 | port->name = kmalloc(name_size, GFP_KERNEL); | |
810 | if (!port->name) { | |
811 | dev_err(port->dev, | |
812 | "Not enough space to store port name\n"); | |
813 | break; | |
814 | } | |
815 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
816 | name_size - 1); | |
817 | port->name[name_size - 1] = 0; | |
818 | ||
819 | /* | |
820 | * Since we only have one sysfs attribute, 'name', | |
821 | * create it only if we have a name for the port. | |
822 | */ | |
823 | err = sysfs_create_group(&port->dev->kobj, | |
824 | &port_attribute_group); | |
825 | if (err) | |
826 | dev_err(port->dev, | |
827 | "Error %d creating sysfs device attributes\n", | |
828 | err); | |
829 | ||
830 | break; | |
17634ba2 AS |
831 | } |
832 | } | |
833 | ||
834 | static void control_work_handler(struct work_struct *work) | |
835 | { | |
836 | struct ports_device *portdev; | |
837 | struct virtqueue *vq; | |
838 | struct port_buffer *buf; | |
839 | unsigned int len; | |
840 | ||
841 | portdev = container_of(work, struct ports_device, control_work); | |
842 | vq = portdev->c_ivq; | |
843 | ||
844 | spin_lock(&portdev->cvq_lock); | |
845 | while ((buf = vq->vq_ops->get_buf(vq, &len))) { | |
846 | spin_unlock(&portdev->cvq_lock); | |
847 | ||
848 | buf->len = len; | |
849 | buf->offset = 0; | |
850 | ||
851 | handle_control_message(portdev, buf); | |
852 | ||
853 | spin_lock(&portdev->cvq_lock); | |
854 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
855 | dev_warn(&portdev->vdev->dev, | |
856 | "Error adding buffer to queue\n"); | |
857 | free_buf(buf); | |
858 | } | |
859 | } | |
860 | spin_unlock(&portdev->cvq_lock); | |
861 | } | |
862 | ||
863 | static void in_intr(struct virtqueue *vq) | |
864 | { | |
865 | struct port *port; | |
866 | unsigned long flags; | |
867 | ||
868 | port = find_port_by_vq(vq->vdev->priv, vq); | |
869 | if (!port) | |
870 | return; | |
871 | ||
872 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
873 | port->inbuf = get_inbuf(port); | |
874 | ||
875 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
876 | ||
2030fa49 AS |
877 | wake_up_interruptible(&port->waitqueue); |
878 | ||
17634ba2 AS |
879 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
880 | hvc_kick(); | |
881 | } | |
882 | ||
883 | static void control_intr(struct virtqueue *vq) | |
884 | { | |
885 | struct ports_device *portdev; | |
886 | ||
887 | portdev = vq->vdev->priv; | |
888 | schedule_work(&portdev->control_work); | |
889 | } | |
890 | ||
891 | static void fill_queue(struct virtqueue *vq, spinlock_t *lock) | |
892 | { | |
893 | struct port_buffer *buf; | |
894 | int ret; | |
895 | ||
896 | do { | |
897 | buf = alloc_buf(PAGE_SIZE); | |
898 | if (!buf) | |
899 | break; | |
900 | ||
901 | spin_lock_irq(lock); | |
902 | ret = add_inbuf(vq, buf); | |
903 | if (ret < 0) { | |
904 | spin_unlock_irq(lock); | |
905 | free_buf(buf); | |
906 | break; | |
907 | } | |
908 | spin_unlock_irq(lock); | |
909 | } while (ret > 0); | |
910 | } | |
911 | ||
912 | static int add_port(struct ports_device *portdev, u32 id) | |
d8a02bd5 | 913 | { |
21206ede | 914 | struct port *port; |
203baab8 | 915 | struct port_buffer *inbuf; |
fb08bd27 | 916 | dev_t devt; |
31610434 | 917 | int err; |
31610434 | 918 | |
1c85bf35 | 919 | port = kmalloc(sizeof(*port), GFP_KERNEL); |
d8a02bd5 RR |
920 | if (!port) { |
921 | err = -ENOMEM; | |
922 | goto fail; | |
f550804a | 923 | } |
73954488 | 924 | |
1c85bf35 | 925 | port->portdev = portdev; |
17634ba2 | 926 | port->id = id; |
203baab8 | 927 | |
431edb8a | 928 | port->name = NULL; |
203baab8 | 929 | port->inbuf = NULL; |
17634ba2 | 930 | port->cons.hvc = NULL; |
203baab8 | 931 | |
3c7969cc | 932 | port->host_connected = port->guest_connected = false; |
2030fa49 | 933 | |
17634ba2 AS |
934 | port->in_vq = portdev->in_vqs[port->id]; |
935 | port->out_vq = portdev->out_vqs[port->id]; | |
31610434 | 936 | |
2030fa49 | 937 | cdev_init(&port->cdev, &port_fops); |
fb08bd27 AS |
938 | |
939 | devt = MKDEV(portdev->chr_major, id); | |
940 | err = cdev_add(&port->cdev, devt, 1); | |
941 | if (err < 0) { | |
942 | dev_err(&port->portdev->vdev->dev, | |
943 | "Error %d adding cdev for port %u\n", err, id); | |
944 | goto free_port; | |
945 | } | |
946 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
947 | devt, port, "vport%up%u", | |
948 | port->portdev->drv_index, id); | |
949 | if (IS_ERR(port->dev)) { | |
950 | err = PTR_ERR(port->dev); | |
951 | dev_err(&port->portdev->vdev->dev, | |
952 | "Error %d creating device for port %u\n", | |
953 | err, id); | |
954 | goto free_cdev; | |
955 | } | |
956 | ||
203baab8 | 957 | spin_lock_init(&port->inbuf_lock); |
2030fa49 | 958 | init_waitqueue_head(&port->waitqueue); |
203baab8 AS |
959 | |
960 | inbuf = alloc_buf(PAGE_SIZE); | |
961 | if (!inbuf) { | |
1c85bf35 | 962 | err = -ENOMEM; |
fb08bd27 | 963 | goto free_device; |
1c85bf35 | 964 | } |
31610434 | 965 | |
203baab8 AS |
966 | /* Register the input buffer the first time. */ |
967 | add_inbuf(port->in_vq, inbuf); | |
968 | ||
17634ba2 AS |
969 | /* |
970 | * If we're not using multiport support, this has to be a console port | |
971 | */ | |
972 | if (!use_multiport(port->portdev)) { | |
973 | err = init_port_console(port); | |
974 | if (err) | |
975 | goto free_inbuf; | |
976 | } | |
977 | ||
978 | spin_lock_irq(&portdev->ports_lock); | |
979 | list_add_tail(&port->list, &port->portdev->ports); | |
980 | spin_unlock_irq(&portdev->ports_lock); | |
981 | ||
982 | /* | |
983 | * Tell the Host we're set so that it can send us various | |
984 | * configuration parameters for this port (eg, port name, | |
985 | * caching, whether this is a console port, etc.) | |
986 | */ | |
987 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
38edf58d | 988 | |
1c85bf35 AS |
989 | return 0; |
990 | ||
991 | free_inbuf: | |
203baab8 | 992 | free_buf(inbuf); |
fb08bd27 AS |
993 | free_device: |
994 | device_destroy(pdrvdata.class, port->dev->devt); | |
995 | free_cdev: | |
996 | cdev_del(&port->cdev); | |
1c85bf35 AS |
997 | free_port: |
998 | kfree(port); | |
999 | fail: | |
1000 | return err; | |
1001 | } | |
1002 | ||
2658a79a AS |
1003 | static int init_vqs(struct ports_device *portdev) |
1004 | { | |
1005 | vq_callback_t **io_callbacks; | |
1006 | char **io_names; | |
1007 | struct virtqueue **vqs; | |
17634ba2 | 1008 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1009 | int err; |
1010 | ||
17634ba2 AS |
1011 | nr_ports = portdev->config.max_nr_ports; |
1012 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1013 | |
1014 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
1015 | if (!vqs) { | |
1016 | err = -ENOMEM; | |
1017 | goto fail; | |
1018 | } | |
1019 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); | |
1020 | if (!io_callbacks) { | |
1021 | err = -ENOMEM; | |
1022 | goto free_vqs; | |
1023 | } | |
1024 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); | |
1025 | if (!io_names) { | |
1026 | err = -ENOMEM; | |
1027 | goto free_callbacks; | |
1028 | } | |
1029 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1030 | GFP_KERNEL); | |
1031 | if (!portdev->in_vqs) { | |
1032 | err = -ENOMEM; | |
1033 | goto free_names; | |
1034 | } | |
1035 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1036 | GFP_KERNEL); | |
1037 | if (!portdev->out_vqs) { | |
1038 | err = -ENOMEM; | |
1039 | goto free_invqs; | |
1040 | } | |
1041 | ||
17634ba2 AS |
1042 | /* |
1043 | * For backward compat (newer host but older guest), the host | |
1044 | * spawns a console port first and also inits the vqs for port | |
1045 | * 0 before others. | |
1046 | */ | |
1047 | j = 0; | |
1048 | io_callbacks[j] = in_intr; | |
1049 | io_callbacks[j + 1] = NULL; | |
1050 | io_names[j] = "input"; | |
1051 | io_names[j + 1] = "output"; | |
1052 | j += 2; | |
1053 | ||
1054 | if (use_multiport(portdev)) { | |
1055 | io_callbacks[j] = control_intr; | |
1056 | io_callbacks[j + 1] = NULL; | |
1057 | io_names[j] = "control-i"; | |
1058 | io_names[j + 1] = "control-o"; | |
1059 | ||
1060 | for (i = 1; i < nr_ports; i++) { | |
1061 | j += 2; | |
1062 | io_callbacks[j] = in_intr; | |
1063 | io_callbacks[j + 1] = NULL; | |
1064 | io_names[j] = "input"; | |
1065 | io_names[j + 1] = "output"; | |
1066 | } | |
1067 | } | |
2658a79a AS |
1068 | /* Find the queues. */ |
1069 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1070 | io_callbacks, | |
1071 | (const char **)io_names); | |
1072 | if (err) | |
1073 | goto free_outvqs; | |
1074 | ||
17634ba2 | 1075 | j = 0; |
2658a79a AS |
1076 | portdev->in_vqs[0] = vqs[0]; |
1077 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1078 | j += 2; |
1079 | if (use_multiport(portdev)) { | |
1080 | portdev->c_ivq = vqs[j]; | |
1081 | portdev->c_ovq = vqs[j + 1]; | |
1082 | ||
1083 | for (i = 1; i < nr_ports; i++) { | |
1084 | j += 2; | |
1085 | portdev->in_vqs[i] = vqs[j]; | |
1086 | portdev->out_vqs[i] = vqs[j + 1]; | |
1087 | } | |
1088 | } | |
2658a79a AS |
1089 | kfree(io_callbacks); |
1090 | kfree(io_names); | |
1091 | kfree(vqs); | |
1092 | ||
1093 | return 0; | |
1094 | ||
1095 | free_names: | |
1096 | kfree(io_names); | |
1097 | free_callbacks: | |
1098 | kfree(io_callbacks); | |
1099 | free_outvqs: | |
1100 | kfree(portdev->out_vqs); | |
1101 | free_invqs: | |
1102 | kfree(portdev->in_vqs); | |
1103 | free_vqs: | |
1104 | kfree(vqs); | |
1105 | fail: | |
1106 | return err; | |
1107 | } | |
1108 | ||
fb08bd27 AS |
1109 | static const struct file_operations portdev_fops = { |
1110 | .owner = THIS_MODULE, | |
1111 | }; | |
1112 | ||
1c85bf35 AS |
1113 | /* |
1114 | * Once we're further in boot, we get probed like any other virtio | |
1115 | * device. | |
17634ba2 AS |
1116 | * |
1117 | * If the host also supports multiple console ports, we check the | |
1118 | * config space to see how many ports the host has spawned. We | |
1119 | * initialize each port found. | |
1c85bf35 AS |
1120 | */ |
1121 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1122 | { | |
1c85bf35 | 1123 | struct ports_device *portdev; |
17634ba2 | 1124 | u32 i; |
1c85bf35 | 1125 | int err; |
17634ba2 | 1126 | bool multiport; |
1c85bf35 AS |
1127 | |
1128 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1129 | if (!portdev) { | |
1130 | err = -ENOMEM; | |
1131 | goto fail; | |
1132 | } | |
1133 | ||
1134 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1135 | portdev->vdev = vdev; | |
1136 | vdev->priv = portdev; | |
1137 | ||
fb08bd27 AS |
1138 | spin_lock_irq(&pdrvdata_lock); |
1139 | portdev->drv_index = pdrvdata.index++; | |
1140 | spin_unlock_irq(&pdrvdata_lock); | |
1141 | ||
1142 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1143 | &portdev_fops); | |
1144 | if (portdev->chr_major < 0) { | |
1145 | dev_err(&vdev->dev, | |
1146 | "Error %d registering chrdev for device %u\n", | |
1147 | portdev->chr_major, portdev->drv_index); | |
1148 | err = portdev->chr_major; | |
1149 | goto free; | |
1150 | } | |
1151 | ||
17634ba2 AS |
1152 | multiport = false; |
1153 | portdev->config.nr_ports = 1; | |
1154 | portdev->config.max_nr_ports = 1; | |
1155 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { | |
1156 | multiport = true; | |
1157 | vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; | |
1158 | ||
1159 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1160 | nr_ports), | |
1161 | &portdev->config.nr_ports, | |
1162 | sizeof(portdev->config.nr_ports)); | |
1163 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1164 | max_nr_ports), | |
1165 | &portdev->config.max_nr_ports, | |
1166 | sizeof(portdev->config.max_nr_ports)); | |
1167 | if (portdev->config.nr_ports > portdev->config.max_nr_ports) { | |
1168 | dev_warn(&vdev->dev, | |
1169 | "More ports (%u) specified than allowed (%u). Will init %u ports.", | |
1170 | portdev->config.nr_ports, | |
1171 | portdev->config.max_nr_ports, | |
1172 | portdev->config.max_nr_ports); | |
1173 | ||
1174 | portdev->config.nr_ports = portdev->config.max_nr_ports; | |
1175 | } | |
1176 | } | |
1177 | ||
1178 | /* Let the Host know we support multiple ports.*/ | |
1179 | vdev->config->finalize_features(vdev); | |
1180 | ||
2658a79a AS |
1181 | err = init_vqs(portdev); |
1182 | if (err < 0) { | |
1183 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1184 | goto free_chrdev; |
2658a79a | 1185 | } |
1c85bf35 | 1186 | |
17634ba2 AS |
1187 | spin_lock_init(&portdev->ports_lock); |
1188 | INIT_LIST_HEAD(&portdev->ports); | |
1189 | ||
1190 | if (multiport) { | |
1191 | spin_lock_init(&portdev->cvq_lock); | |
1192 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
1193 | ||
1194 | fill_queue(portdev->c_ivq, &portdev->cvq_lock); | |
1195 | } | |
1196 | ||
1197 | for (i = 0; i < portdev->config.nr_ports; i++) | |
1198 | add_port(portdev, i); | |
1c85bf35 | 1199 | |
971f3390 RR |
1200 | /* Start using the new console output. */ |
1201 | early_put_chars = NULL; | |
31610434 RR |
1202 | return 0; |
1203 | ||
fb08bd27 AS |
1204 | free_chrdev: |
1205 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1206 | free: |
1c85bf35 | 1207 | kfree(portdev); |
31610434 RR |
1208 | fail: |
1209 | return err; | |
1210 | } | |
1211 | ||
1212 | static struct virtio_device_id id_table[] = { | |
1213 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1214 | { 0 }, | |
1215 | }; | |
1216 | ||
c2983458 CB |
1217 | static unsigned int features[] = { |
1218 | VIRTIO_CONSOLE_F_SIZE, | |
17634ba2 | 1219 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1220 | }; |
1221 | ||
31610434 | 1222 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1223 | .feature_table = features, |
1224 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1225 | .driver.name = KBUILD_MODNAME, |
1226 | .driver.owner = THIS_MODULE, | |
1227 | .id_table = id_table, | |
1228 | .probe = virtcons_probe, | |
c2983458 | 1229 | .config_changed = virtcons_apply_config, |
31610434 RR |
1230 | }; |
1231 | ||
1232 | static int __init init(void) | |
1233 | { | |
fb08bd27 AS |
1234 | int err; |
1235 | ||
1236 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
1237 | if (IS_ERR(pdrvdata.class)) { | |
1238 | err = PTR_ERR(pdrvdata.class); | |
1239 | pr_err("Error %d creating virtio-ports class\n", err); | |
1240 | return err; | |
1241 | } | |
38edf58d AS |
1242 | INIT_LIST_HEAD(&pdrvdata.consoles); |
1243 | ||
31610434 RR |
1244 | return register_virtio_driver(&virtio_console); |
1245 | } | |
1246 | module_init(init); | |
1247 | ||
1248 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1249 | MODULE_DESCRIPTION("Virtio console driver"); | |
1250 | MODULE_LICENSE("GPL"); |