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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; | |
7f5d810d | 108 | struct work_struct config_work; |
17634ba2 AS |
109 | |
110 | struct list_head ports; | |
111 | ||
112 | /* To protect the list of ports */ | |
113 | spinlock_t ports_lock; | |
114 | ||
115 | /* To protect the vq operations for the control channel */ | |
116 | spinlock_t cvq_lock; | |
117 | ||
118 | /* The current config space is stored here */ | |
119 | struct virtio_console_config config; | |
120 | ||
121 | /* The virtio device we're associated with */ | |
122 | struct virtio_device *vdev; | |
123 | ||
124 | /* | |
125 | * A couple of virtqueues for the control channel: one for | |
126 | * guest->host transfers, one for host->guest transfers | |
127 | */ | |
128 | struct virtqueue *c_ivq, *c_ovq; | |
129 | ||
130 | /* Array of per-port IO virtqueues */ | |
131 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
132 | |
133 | /* Used for numbering devices for sysfs and debugfs */ | |
134 | unsigned int drv_index; | |
135 | ||
136 | /* Major number for this device. Ports will be created as minors. */ | |
137 | int chr_major; | |
17634ba2 AS |
138 | }; |
139 | ||
1c85bf35 | 140 | /* This struct holds the per-port data */ |
21206ede | 141 | struct port { |
17634ba2 AS |
142 | /* Next port in the list, head is in the ports_device */ |
143 | struct list_head list; | |
144 | ||
1c85bf35 AS |
145 | /* Pointer to the parent virtio_console device */ |
146 | struct ports_device *portdev; | |
fdb9a054 AS |
147 | |
148 | /* The current buffer from which data has to be fed to readers */ | |
149 | struct port_buffer *inbuf; | |
21206ede | 150 | |
203baab8 AS |
151 | /* |
152 | * To protect the operations on the in_vq associated with this | |
153 | * port. Has to be a spinlock because it can be called from | |
154 | * interrupt context (get_char()). | |
155 | */ | |
156 | spinlock_t inbuf_lock; | |
157 | ||
1c85bf35 AS |
158 | /* The IO vqs for this port */ |
159 | struct virtqueue *in_vq, *out_vq; | |
160 | ||
4f23c573 AS |
161 | /* |
162 | * The entries in this struct will be valid if this port is | |
163 | * hooked up to an hvc console | |
164 | */ | |
165 | struct console cons; | |
17634ba2 | 166 | |
fb08bd27 AS |
167 | /* Each port associates with a separate char device */ |
168 | struct cdev cdev; | |
169 | struct device *dev; | |
170 | ||
2030fa49 AS |
171 | /* A waitqueue for poll() or blocking read operations */ |
172 | wait_queue_head_t waitqueue; | |
173 | ||
431edb8a AS |
174 | /* The 'name' of the port that we expose via sysfs properties */ |
175 | char *name; | |
176 | ||
17634ba2 AS |
177 | /* The 'id' to identify the port with the Host */ |
178 | u32 id; | |
2030fa49 AS |
179 | |
180 | /* Is the host device open */ | |
181 | bool host_connected; | |
3c7969cc AS |
182 | |
183 | /* We should allow only one process to open a port */ | |
184 | bool guest_connected; | |
21206ede | 185 | }; |
31610434 | 186 | |
971f3390 RR |
187 | /* This is the very early arch-specified put chars function. */ |
188 | static int (*early_put_chars)(u32, const char *, int); | |
189 | ||
38edf58d AS |
190 | static struct port *find_port_by_vtermno(u32 vtermno) |
191 | { | |
192 | struct port *port; | |
4f23c573 | 193 | struct console *cons; |
38edf58d AS |
194 | unsigned long flags; |
195 | ||
196 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
197 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
198 | if (cons->vtermno == vtermno) { | |
199 | port = container_of(cons, struct port, cons); | |
38edf58d | 200 | goto out; |
4f23c573 | 201 | } |
38edf58d AS |
202 | } |
203 | port = NULL; | |
204 | out: | |
205 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
206 | return port; | |
207 | } | |
208 | ||
17634ba2 AS |
209 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
210 | { | |
211 | struct port *port; | |
212 | unsigned long flags; | |
213 | ||
214 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
215 | list_for_each_entry(port, &portdev->ports, list) | |
216 | if (port->id == id) | |
217 | goto out; | |
218 | port = NULL; | |
219 | out: | |
220 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
221 | ||
222 | return port; | |
223 | } | |
224 | ||
203baab8 AS |
225 | static struct port *find_port_by_vq(struct ports_device *portdev, |
226 | struct virtqueue *vq) | |
227 | { | |
228 | struct port *port; | |
203baab8 AS |
229 | unsigned long flags; |
230 | ||
17634ba2 AS |
231 | spin_lock_irqsave(&portdev->ports_lock, flags); |
232 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
233 | if (port->in_vq == vq || port->out_vq == vq) |
234 | goto out; | |
203baab8 AS |
235 | port = NULL; |
236 | out: | |
17634ba2 | 237 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
238 | return port; |
239 | } | |
240 | ||
17634ba2 AS |
241 | static bool is_console_port(struct port *port) |
242 | { | |
243 | if (port->cons.hvc) | |
244 | return true; | |
245 | return false; | |
246 | } | |
247 | ||
248 | static inline bool use_multiport(struct ports_device *portdev) | |
249 | { | |
250 | /* | |
251 | * This condition can be true when put_chars is called from | |
252 | * early_init | |
253 | */ | |
254 | if (!portdev->vdev) | |
255 | return 0; | |
256 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
257 | } | |
258 | ||
fdb9a054 AS |
259 | static void free_buf(struct port_buffer *buf) |
260 | { | |
261 | kfree(buf->buf); | |
262 | kfree(buf); | |
263 | } | |
264 | ||
265 | static struct port_buffer *alloc_buf(size_t buf_size) | |
266 | { | |
267 | struct port_buffer *buf; | |
268 | ||
269 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
270 | if (!buf) | |
271 | goto fail; | |
272 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
273 | if (!buf->buf) | |
274 | goto free_buf; | |
275 | buf->len = 0; | |
276 | buf->offset = 0; | |
277 | buf->size = buf_size; | |
278 | return buf; | |
279 | ||
280 | free_buf: | |
281 | kfree(buf); | |
282 | fail: | |
283 | return NULL; | |
284 | } | |
285 | ||
a3cde449 AS |
286 | /* Callers should take appropriate locks */ |
287 | static void *get_inbuf(struct port *port) | |
288 | { | |
289 | struct port_buffer *buf; | |
290 | struct virtqueue *vq; | |
291 | unsigned int len; | |
292 | ||
293 | vq = port->in_vq; | |
294 | buf = vq->vq_ops->get_buf(vq, &len); | |
295 | if (buf) { | |
296 | buf->len = len; | |
297 | buf->offset = 0; | |
298 | } | |
299 | return buf; | |
300 | } | |
301 | ||
e27b5198 AS |
302 | /* |
303 | * Create a scatter-gather list representing our input buffer and put | |
304 | * it in the queue. | |
305 | * | |
306 | * Callers should take appropriate locks. | |
307 | */ | |
203baab8 | 308 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
309 | { |
310 | struct scatterlist sg[1]; | |
203baab8 | 311 | int ret; |
1c85bf35 | 312 | |
e27b5198 AS |
313 | sg_init_one(sg, buf->buf, buf->size); |
314 | ||
203baab8 | 315 | ret = vq->vq_ops->add_buf(vq, sg, 0, 1, buf); |
e27b5198 | 316 | vq->vq_ops->kick(vq); |
203baab8 AS |
317 | return ret; |
318 | } | |
319 | ||
88f251ac AS |
320 | /* Discard any unread data this port has. Callers lockers. */ |
321 | static void discard_port_data(struct port *port) | |
322 | { | |
323 | struct port_buffer *buf; | |
324 | struct virtqueue *vq; | |
325 | unsigned int len; | |
326 | ||
327 | vq = port->in_vq; | |
328 | if (port->inbuf) | |
329 | buf = port->inbuf; | |
330 | else | |
331 | buf = vq->vq_ops->get_buf(vq, &len); | |
332 | ||
333 | if (!buf) | |
334 | return; | |
335 | ||
336 | if (add_inbuf(vq, buf) < 0) { | |
337 | buf->len = buf->offset = 0; | |
338 | dev_warn(port->dev, "Error adding buffer back to vq\n"); | |
339 | return; | |
340 | } | |
341 | ||
342 | port->inbuf = NULL; | |
343 | } | |
344 | ||
203baab8 AS |
345 | static bool port_has_data(struct port *port) |
346 | { | |
347 | unsigned long flags; | |
348 | bool ret; | |
349 | ||
350 | ret = false; | |
351 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
352 | if (port->inbuf) | |
353 | ret = true; | |
354 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
355 | ||
356 | return ret; | |
357 | } | |
358 | ||
17634ba2 AS |
359 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
360 | unsigned int value) | |
361 | { | |
362 | struct scatterlist sg[1]; | |
363 | struct virtio_console_control cpkt; | |
364 | struct virtqueue *vq; | |
365 | int len; | |
366 | ||
367 | if (!use_multiport(port->portdev)) | |
368 | return 0; | |
369 | ||
370 | cpkt.id = port->id; | |
371 | cpkt.event = event; | |
372 | cpkt.value = value; | |
373 | ||
374 | vq = port->portdev->c_ovq; | |
375 | ||
376 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
377 | if (vq->vq_ops->add_buf(vq, sg, 1, 0, &cpkt) >= 0) { | |
378 | vq->vq_ops->kick(vq); | |
379 | while (!vq->vq_ops->get_buf(vq, &len)) | |
380 | cpu_relax(); | |
381 | } | |
382 | return 0; | |
383 | } | |
384 | ||
f997f00b AS |
385 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count) |
386 | { | |
387 | struct scatterlist sg[1]; | |
388 | struct virtqueue *out_vq; | |
389 | ssize_t ret; | |
390 | unsigned int len; | |
391 | ||
392 | out_vq = port->out_vq; | |
393 | ||
394 | sg_init_one(sg, in_buf, in_count); | |
395 | ret = out_vq->vq_ops->add_buf(out_vq, sg, 1, 0, in_buf); | |
396 | ||
397 | /* Tell Host to go! */ | |
398 | out_vq->vq_ops->kick(out_vq); | |
399 | ||
400 | if (ret < 0) { | |
401 | len = 0; | |
402 | goto fail; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Wait till the host acknowledges it pushed out the data we | |
407 | * sent. Also ensure we return to userspace the number of | |
408 | * bytes that were successfully consumed by the host. | |
409 | */ | |
410 | while (!out_vq->vq_ops->get_buf(out_vq, &len)) | |
411 | cpu_relax(); | |
412 | fail: | |
413 | /* We're expected to return the amount of data we wrote */ | |
414 | return len; | |
415 | } | |
416 | ||
203baab8 AS |
417 | /* |
418 | * Give out the data that's requested from the buffer that we have | |
419 | * queued up. | |
420 | */ | |
b766ceed AS |
421 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
422 | bool to_user) | |
203baab8 AS |
423 | { |
424 | struct port_buffer *buf; | |
425 | unsigned long flags; | |
426 | ||
427 | if (!out_count || !port_has_data(port)) | |
428 | return 0; | |
429 | ||
430 | buf = port->inbuf; | |
b766ceed | 431 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 432 | |
b766ceed AS |
433 | if (to_user) { |
434 | ssize_t ret; | |
435 | ||
436 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
437 | if (ret) | |
438 | return -EFAULT; | |
439 | } else { | |
440 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
441 | } | |
203baab8 | 442 | |
203baab8 AS |
443 | buf->offset += out_count; |
444 | ||
445 | if (buf->offset == buf->len) { | |
446 | /* | |
447 | * We're done using all the data in this buffer. | |
448 | * Re-queue so that the Host can send us more data. | |
449 | */ | |
450 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
451 | port->inbuf = NULL; | |
452 | ||
453 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 454 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
455 | |
456 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
457 | } | |
b766ceed | 458 | /* Return the number of bytes actually copied */ |
203baab8 | 459 | return out_count; |
e27b5198 AS |
460 | } |
461 | ||
2030fa49 AS |
462 | /* The condition that must be true for polling to end */ |
463 | static bool wait_is_over(struct port *port) | |
464 | { | |
465 | return port_has_data(port) || !port->host_connected; | |
466 | } | |
467 | ||
468 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, | |
469 | size_t count, loff_t *offp) | |
470 | { | |
471 | struct port *port; | |
472 | ssize_t ret; | |
473 | ||
474 | port = filp->private_data; | |
475 | ||
476 | if (!port_has_data(port)) { | |
477 | /* | |
478 | * If nothing's connected on the host just return 0 in | |
479 | * case of list_empty; this tells the userspace app | |
480 | * that there's no connection | |
481 | */ | |
482 | if (!port->host_connected) | |
483 | return 0; | |
484 | if (filp->f_flags & O_NONBLOCK) | |
485 | return -EAGAIN; | |
486 | ||
487 | ret = wait_event_interruptible(port->waitqueue, | |
488 | wait_is_over(port)); | |
489 | if (ret < 0) | |
490 | return ret; | |
491 | } | |
492 | /* | |
493 | * We could've received a disconnection message while we were | |
494 | * waiting for more data. | |
495 | * | |
496 | * This check is not clubbed in the if() statement above as we | |
497 | * might receive some data as well as the host could get | |
498 | * disconnected after we got woken up from our wait. So we | |
499 | * really want to give off whatever data we have and only then | |
500 | * check for host_connected. | |
501 | */ | |
502 | if (!port_has_data(port) && !port->host_connected) | |
503 | return 0; | |
504 | ||
505 | return fill_readbuf(port, ubuf, count, true); | |
506 | } | |
507 | ||
508 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
509 | size_t count, loff_t *offp) | |
510 | { | |
511 | struct port *port; | |
512 | char *buf; | |
513 | ssize_t ret; | |
514 | ||
515 | port = filp->private_data; | |
516 | ||
517 | count = min((size_t)(32 * 1024), count); | |
518 | ||
519 | buf = kmalloc(count, GFP_KERNEL); | |
520 | if (!buf) | |
521 | return -ENOMEM; | |
522 | ||
523 | ret = copy_from_user(buf, ubuf, count); | |
524 | if (ret) { | |
525 | ret = -EFAULT; | |
526 | goto free_buf; | |
527 | } | |
528 | ||
529 | ret = send_buf(port, buf, count); | |
530 | free_buf: | |
531 | kfree(buf); | |
532 | return ret; | |
533 | } | |
534 | ||
535 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
536 | { | |
537 | struct port *port; | |
538 | unsigned int ret; | |
539 | ||
540 | port = filp->private_data; | |
541 | poll_wait(filp, &port->waitqueue, wait); | |
542 | ||
543 | ret = 0; | |
544 | if (port->inbuf) | |
545 | ret |= POLLIN | POLLRDNORM; | |
546 | if (port->host_connected) | |
547 | ret |= POLLOUT; | |
548 | if (!port->host_connected) | |
549 | ret |= POLLHUP; | |
550 | ||
551 | return ret; | |
552 | } | |
553 | ||
554 | static int port_fops_release(struct inode *inode, struct file *filp) | |
555 | { | |
556 | struct port *port; | |
557 | ||
558 | port = filp->private_data; | |
559 | ||
560 | /* Notify host of port being closed */ | |
561 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
562 | ||
88f251ac | 563 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
564 | port->guest_connected = false; |
565 | ||
88f251ac AS |
566 | discard_port_data(port); |
567 | ||
568 | spin_unlock_irq(&port->inbuf_lock); | |
569 | ||
2030fa49 AS |
570 | return 0; |
571 | } | |
572 | ||
573 | static int port_fops_open(struct inode *inode, struct file *filp) | |
574 | { | |
575 | struct cdev *cdev = inode->i_cdev; | |
576 | struct port *port; | |
577 | ||
578 | port = container_of(cdev, struct port, cdev); | |
579 | filp->private_data = port; | |
580 | ||
581 | /* | |
582 | * Don't allow opening of console port devices -- that's done | |
583 | * via /dev/hvc | |
584 | */ | |
585 | if (is_console_port(port)) | |
586 | return -ENXIO; | |
587 | ||
3c7969cc AS |
588 | /* Allow only one process to open a particular port at a time */ |
589 | spin_lock_irq(&port->inbuf_lock); | |
590 | if (port->guest_connected) { | |
591 | spin_unlock_irq(&port->inbuf_lock); | |
592 | return -EMFILE; | |
593 | } | |
594 | ||
595 | port->guest_connected = true; | |
596 | spin_unlock_irq(&port->inbuf_lock); | |
597 | ||
2030fa49 AS |
598 | /* Notify host of port being opened */ |
599 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | /* | |
605 | * The file operations that we support: programs in the guest can open | |
606 | * a console device, read from it, write to it, poll for data and | |
607 | * close it. The devices are at | |
608 | * /dev/vport<device number>p<port number> | |
609 | */ | |
610 | static const struct file_operations port_fops = { | |
611 | .owner = THIS_MODULE, | |
612 | .open = port_fops_open, | |
613 | .read = port_fops_read, | |
614 | .write = port_fops_write, | |
615 | .poll = port_fops_poll, | |
616 | .release = port_fops_release, | |
617 | }; | |
618 | ||
a23ea924 RR |
619 | /* |
620 | * The put_chars() callback is pretty straightforward. | |
31610434 | 621 | * |
a23ea924 RR |
622 | * We turn the characters into a scatter-gather list, add it to the |
623 | * output queue and then kick the Host. Then we sit here waiting for | |
624 | * it to finish: inefficient in theory, but in practice | |
625 | * implementations will do it immediately (lguest's Launcher does). | |
626 | */ | |
31610434 RR |
627 | static int put_chars(u32 vtermno, const char *buf, int count) |
628 | { | |
21206ede | 629 | struct port *port; |
38edf58d AS |
630 | |
631 | port = find_port_by_vtermno(vtermno); | |
632 | if (!port) | |
633 | return 0; | |
31610434 | 634 | |
971f3390 RR |
635 | if (unlikely(early_put_chars)) |
636 | return early_put_chars(vtermno, buf, count); | |
637 | ||
f997f00b | 638 | return send_buf(port, (void *)buf, count); |
31610434 RR |
639 | } |
640 | ||
a23ea924 RR |
641 | /* |
642 | * get_chars() is the callback from the hvc_console infrastructure | |
643 | * when an interrupt is received. | |
31610434 | 644 | * |
203baab8 AS |
645 | * We call out to fill_readbuf that gets us the required data from the |
646 | * buffers that are queued up. | |
a23ea924 | 647 | */ |
31610434 RR |
648 | static int get_chars(u32 vtermno, char *buf, int count) |
649 | { | |
21206ede RR |
650 | struct port *port; |
651 | ||
38edf58d AS |
652 | port = find_port_by_vtermno(vtermno); |
653 | if (!port) | |
654 | return 0; | |
21206ede | 655 | |
31610434 | 656 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 657 | BUG_ON(!port->in_vq); |
31610434 | 658 | |
b766ceed | 659 | return fill_readbuf(port, buf, count, false); |
31610434 | 660 | } |
31610434 | 661 | |
cb06e367 | 662 | static void resize_console(struct port *port) |
c2983458 | 663 | { |
cb06e367 | 664 | struct virtio_device *vdev; |
c2983458 CB |
665 | struct winsize ws; |
666 | ||
cb06e367 AS |
667 | vdev = port->portdev->vdev; |
668 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) { | |
669 | vdev->config->get(vdev, | |
670 | offsetof(struct virtio_console_config, cols), | |
671 | &ws.ws_col, sizeof(u16)); | |
672 | vdev->config->get(vdev, | |
673 | offsetof(struct virtio_console_config, rows), | |
674 | &ws.ws_row, sizeof(u16)); | |
4f23c573 | 675 | hvc_resize(port->cons.hvc, ws); |
c2983458 CB |
676 | } |
677 | } | |
678 | ||
38edf58d | 679 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
680 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
681 | { | |
38edf58d AS |
682 | struct port *port; |
683 | ||
684 | port = find_port_by_vtermno(hp->vtermno); | |
685 | if (!port) | |
686 | return -EINVAL; | |
687 | ||
91fcad19 | 688 | hp->irq_requested = 1; |
cb06e367 | 689 | resize_console(port); |
c2983458 | 690 | |
91fcad19 CB |
691 | return 0; |
692 | } | |
693 | ||
694 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
695 | { | |
696 | hp->irq_requested = 0; | |
697 | } | |
698 | ||
17634ba2 | 699 | /* The operations for console ports. */ |
1dff3996 | 700 | static const struct hv_ops hv_ops = { |
971f3390 RR |
701 | .get_chars = get_chars, |
702 | .put_chars = put_chars, | |
703 | .notifier_add = notifier_add_vio, | |
704 | .notifier_del = notifier_del_vio, | |
705 | .notifier_hangup = notifier_del_vio, | |
706 | }; | |
707 | ||
708 | /* | |
709 | * Console drivers are initialized very early so boot messages can go | |
710 | * out, so we do things slightly differently from the generic virtio | |
711 | * initialization of the net and block drivers. | |
712 | * | |
713 | * At this stage, the console is output-only. It's too early to set | |
714 | * up a virtqueue, so we let the drivers do some boutique early-output | |
715 | * thing. | |
716 | */ | |
717 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
718 | { | |
719 | early_put_chars = put_chars; | |
720 | return hvc_instantiate(0, 0, &hv_ops); | |
721 | } | |
722 | ||
17634ba2 | 723 | int init_port_console(struct port *port) |
cfa6d379 AS |
724 | { |
725 | int ret; | |
726 | ||
727 | /* | |
728 | * The Host's telling us this port is a console port. Hook it | |
729 | * up with an hvc console. | |
730 | * | |
731 | * To set up and manage our virtual console, we call | |
732 | * hvc_alloc(). | |
733 | * | |
734 | * The first argument of hvc_alloc() is the virtual console | |
735 | * number. The second argument is the parameter for the | |
736 | * notification mechanism (like irq number). We currently | |
737 | * leave this as zero, virtqueues have implicit notifications. | |
738 | * | |
739 | * The third argument is a "struct hv_ops" containing the | |
740 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
741 | * pointers. The final argument is the output buffer size: we | |
742 | * can do any size, so we put PAGE_SIZE here. | |
743 | */ | |
744 | port->cons.vtermno = pdrvdata.next_vtermno; | |
745 | ||
746 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
747 | if (IS_ERR(port->cons.hvc)) { | |
748 | ret = PTR_ERR(port->cons.hvc); | |
749 | port->cons.hvc = NULL; | |
750 | return ret; | |
751 | } | |
752 | spin_lock_irq(&pdrvdata_lock); | |
753 | pdrvdata.next_vtermno++; | |
754 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
755 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 756 | port->guest_connected = true; |
cfa6d379 | 757 | |
2030fa49 AS |
758 | /* Notify host of port being opened */ |
759 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
760 | ||
cfa6d379 AS |
761 | return 0; |
762 | } | |
763 | ||
431edb8a AS |
764 | static ssize_t show_port_name(struct device *dev, |
765 | struct device_attribute *attr, char *buffer) | |
766 | { | |
767 | struct port *port; | |
768 | ||
769 | port = dev_get_drvdata(dev); | |
770 | ||
771 | return sprintf(buffer, "%s\n", port->name); | |
772 | } | |
773 | ||
774 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
775 | ||
776 | static struct attribute *port_sysfs_entries[] = { | |
777 | &dev_attr_name.attr, | |
778 | NULL | |
779 | }; | |
780 | ||
781 | static struct attribute_group port_attribute_group = { | |
782 | .name = NULL, /* put in device directory */ | |
783 | .attrs = port_sysfs_entries, | |
784 | }; | |
785 | ||
17634ba2 AS |
786 | /* Any private messages that the Host and Guest want to share */ |
787 | static void handle_control_message(struct ports_device *portdev, | |
788 | struct port_buffer *buf) | |
789 | { | |
790 | struct virtio_console_control *cpkt; | |
791 | struct port *port; | |
431edb8a AS |
792 | size_t name_size; |
793 | int err; | |
17634ba2 AS |
794 | |
795 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
796 | ||
797 | port = find_port_by_id(portdev, cpkt->id); | |
798 | if (!port) { | |
799 | /* No valid header at start of buffer. Drop it. */ | |
800 | dev_dbg(&portdev->vdev->dev, | |
801 | "Invalid index %u in control packet\n", cpkt->id); | |
802 | return; | |
803 | } | |
804 | ||
805 | switch (cpkt->event) { | |
806 | case VIRTIO_CONSOLE_CONSOLE_PORT: | |
807 | if (!cpkt->value) | |
808 | break; | |
809 | if (is_console_port(port)) | |
810 | break; | |
811 | ||
812 | init_port_console(port); | |
813 | /* | |
814 | * Could remove the port here in case init fails - but | |
815 | * have to notify the host first. | |
816 | */ | |
817 | break; | |
818 | case VIRTIO_CONSOLE_RESIZE: | |
819 | if (!is_console_port(port)) | |
820 | break; | |
821 | port->cons.hvc->irq_requested = 1; | |
822 | resize_console(port); | |
823 | break; | |
2030fa49 AS |
824 | case VIRTIO_CONSOLE_PORT_OPEN: |
825 | port->host_connected = cpkt->value; | |
826 | wake_up_interruptible(&port->waitqueue); | |
827 | break; | |
431edb8a AS |
828 | case VIRTIO_CONSOLE_PORT_NAME: |
829 | /* | |
830 | * Skip the size of the header and the cpkt to get the size | |
831 | * of the name that was sent | |
832 | */ | |
833 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
834 | ||
835 | port->name = kmalloc(name_size, GFP_KERNEL); | |
836 | if (!port->name) { | |
837 | dev_err(port->dev, | |
838 | "Not enough space to store port name\n"); | |
839 | break; | |
840 | } | |
841 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
842 | name_size - 1); | |
843 | port->name[name_size - 1] = 0; | |
844 | ||
845 | /* | |
846 | * Since we only have one sysfs attribute, 'name', | |
847 | * create it only if we have a name for the port. | |
848 | */ | |
849 | err = sysfs_create_group(&port->dev->kobj, | |
850 | &port_attribute_group); | |
851 | if (err) | |
852 | dev_err(port->dev, | |
853 | "Error %d creating sysfs device attributes\n", | |
854 | err); | |
855 | ||
856 | break; | |
17634ba2 AS |
857 | } |
858 | } | |
859 | ||
860 | static void control_work_handler(struct work_struct *work) | |
861 | { | |
862 | struct ports_device *portdev; | |
863 | struct virtqueue *vq; | |
864 | struct port_buffer *buf; | |
865 | unsigned int len; | |
866 | ||
867 | portdev = container_of(work, struct ports_device, control_work); | |
868 | vq = portdev->c_ivq; | |
869 | ||
870 | spin_lock(&portdev->cvq_lock); | |
871 | while ((buf = vq->vq_ops->get_buf(vq, &len))) { | |
872 | spin_unlock(&portdev->cvq_lock); | |
873 | ||
874 | buf->len = len; | |
875 | buf->offset = 0; | |
876 | ||
877 | handle_control_message(portdev, buf); | |
878 | ||
879 | spin_lock(&portdev->cvq_lock); | |
880 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
881 | dev_warn(&portdev->vdev->dev, | |
882 | "Error adding buffer to queue\n"); | |
883 | free_buf(buf); | |
884 | } | |
885 | } | |
886 | spin_unlock(&portdev->cvq_lock); | |
887 | } | |
888 | ||
889 | static void in_intr(struct virtqueue *vq) | |
890 | { | |
891 | struct port *port; | |
892 | unsigned long flags; | |
893 | ||
894 | port = find_port_by_vq(vq->vdev->priv, vq); | |
895 | if (!port) | |
896 | return; | |
897 | ||
898 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
899 | port->inbuf = get_inbuf(port); | |
900 | ||
88f251ac AS |
901 | /* |
902 | * Don't queue up data when port is closed. This condition | |
903 | * can be reached when a console port is not yet connected (no | |
904 | * tty is spawned) and the host sends out data to console | |
905 | * ports. For generic serial ports, the host won't | |
906 | * (shouldn't) send data till the guest is connected. | |
907 | */ | |
908 | if (!port->guest_connected) | |
909 | discard_port_data(port); | |
910 | ||
17634ba2 AS |
911 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
912 | ||
2030fa49 AS |
913 | wake_up_interruptible(&port->waitqueue); |
914 | ||
17634ba2 AS |
915 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
916 | hvc_kick(); | |
917 | } | |
918 | ||
919 | static void control_intr(struct virtqueue *vq) | |
920 | { | |
921 | struct ports_device *portdev; | |
922 | ||
923 | portdev = vq->vdev->priv; | |
924 | schedule_work(&portdev->control_work); | |
925 | } | |
926 | ||
7f5d810d AS |
927 | static void config_intr(struct virtio_device *vdev) |
928 | { | |
929 | struct ports_device *portdev; | |
930 | ||
931 | portdev = vdev->priv; | |
932 | if (use_multiport(portdev)) { | |
933 | /* Handle port hot-add */ | |
934 | schedule_work(&portdev->config_work); | |
935 | } | |
936 | /* | |
937 | * We'll use this way of resizing only for legacy support. | |
938 | * For newer userspace (VIRTIO_CONSOLE_F_MULTPORT+), use | |
939 | * control messages to indicate console size changes so that | |
940 | * it can be done per-port | |
941 | */ | |
942 | resize_console(find_port_by_id(portdev, 0)); | |
943 | } | |
944 | ||
17634ba2 AS |
945 | static void fill_queue(struct virtqueue *vq, spinlock_t *lock) |
946 | { | |
947 | struct port_buffer *buf; | |
948 | int ret; | |
949 | ||
950 | do { | |
951 | buf = alloc_buf(PAGE_SIZE); | |
952 | if (!buf) | |
953 | break; | |
954 | ||
955 | spin_lock_irq(lock); | |
956 | ret = add_inbuf(vq, buf); | |
957 | if (ret < 0) { | |
958 | spin_unlock_irq(lock); | |
959 | free_buf(buf); | |
960 | break; | |
961 | } | |
962 | spin_unlock_irq(lock); | |
963 | } while (ret > 0); | |
964 | } | |
965 | ||
966 | static int add_port(struct ports_device *portdev, u32 id) | |
d8a02bd5 | 967 | { |
21206ede | 968 | struct port *port; |
203baab8 | 969 | struct port_buffer *inbuf; |
fb08bd27 | 970 | dev_t devt; |
31610434 | 971 | int err; |
31610434 | 972 | |
1c85bf35 | 973 | port = kmalloc(sizeof(*port), GFP_KERNEL); |
d8a02bd5 RR |
974 | if (!port) { |
975 | err = -ENOMEM; | |
976 | goto fail; | |
f550804a | 977 | } |
73954488 | 978 | |
1c85bf35 | 979 | port->portdev = portdev; |
17634ba2 | 980 | port->id = id; |
203baab8 | 981 | |
431edb8a | 982 | port->name = NULL; |
203baab8 | 983 | port->inbuf = NULL; |
17634ba2 | 984 | port->cons.hvc = NULL; |
203baab8 | 985 | |
3c7969cc | 986 | port->host_connected = port->guest_connected = false; |
2030fa49 | 987 | |
17634ba2 AS |
988 | port->in_vq = portdev->in_vqs[port->id]; |
989 | port->out_vq = portdev->out_vqs[port->id]; | |
31610434 | 990 | |
2030fa49 | 991 | cdev_init(&port->cdev, &port_fops); |
fb08bd27 AS |
992 | |
993 | devt = MKDEV(portdev->chr_major, id); | |
994 | err = cdev_add(&port->cdev, devt, 1); | |
995 | if (err < 0) { | |
996 | dev_err(&port->portdev->vdev->dev, | |
997 | "Error %d adding cdev for port %u\n", err, id); | |
998 | goto free_port; | |
999 | } | |
1000 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1001 | devt, port, "vport%up%u", | |
1002 | port->portdev->drv_index, id); | |
1003 | if (IS_ERR(port->dev)) { | |
1004 | err = PTR_ERR(port->dev); | |
1005 | dev_err(&port->portdev->vdev->dev, | |
1006 | "Error %d creating device for port %u\n", | |
1007 | err, id); | |
1008 | goto free_cdev; | |
1009 | } | |
1010 | ||
203baab8 | 1011 | spin_lock_init(&port->inbuf_lock); |
2030fa49 | 1012 | init_waitqueue_head(&port->waitqueue); |
203baab8 AS |
1013 | |
1014 | inbuf = alloc_buf(PAGE_SIZE); | |
1015 | if (!inbuf) { | |
1c85bf35 | 1016 | err = -ENOMEM; |
fb08bd27 | 1017 | goto free_device; |
1c85bf35 | 1018 | } |
31610434 | 1019 | |
203baab8 AS |
1020 | /* Register the input buffer the first time. */ |
1021 | add_inbuf(port->in_vq, inbuf); | |
1022 | ||
17634ba2 AS |
1023 | /* |
1024 | * If we're not using multiport support, this has to be a console port | |
1025 | */ | |
1026 | if (!use_multiport(port->portdev)) { | |
1027 | err = init_port_console(port); | |
1028 | if (err) | |
1029 | goto free_inbuf; | |
1030 | } | |
1031 | ||
1032 | spin_lock_irq(&portdev->ports_lock); | |
1033 | list_add_tail(&port->list, &port->portdev->ports); | |
1034 | spin_unlock_irq(&portdev->ports_lock); | |
1035 | ||
1036 | /* | |
1037 | * Tell the Host we're set so that it can send us various | |
1038 | * configuration parameters for this port (eg, port name, | |
1039 | * caching, whether this is a console port, etc.) | |
1040 | */ | |
1041 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
38edf58d | 1042 | |
1c85bf35 AS |
1043 | return 0; |
1044 | ||
1045 | free_inbuf: | |
203baab8 | 1046 | free_buf(inbuf); |
fb08bd27 AS |
1047 | free_device: |
1048 | device_destroy(pdrvdata.class, port->dev->devt); | |
1049 | free_cdev: | |
1050 | cdev_del(&port->cdev); | |
1c85bf35 AS |
1051 | free_port: |
1052 | kfree(port); | |
1053 | fail: | |
1054 | return err; | |
1055 | } | |
1056 | ||
7f5d810d AS |
1057 | /* |
1058 | * The workhandler for config-space updates. | |
1059 | * | |
1060 | * This is called when ports are hot-added. | |
1061 | */ | |
1062 | static void config_work_handler(struct work_struct *work) | |
1063 | { | |
1064 | struct virtio_console_config virtconconf; | |
1065 | struct ports_device *portdev; | |
1066 | struct virtio_device *vdev; | |
1067 | int err; | |
1068 | ||
1069 | portdev = container_of(work, struct ports_device, config_work); | |
1070 | ||
1071 | vdev = portdev->vdev; | |
1072 | vdev->config->get(vdev, | |
1073 | offsetof(struct virtio_console_config, nr_ports), | |
1074 | &virtconconf.nr_ports, | |
1075 | sizeof(virtconconf.nr_ports)); | |
1076 | ||
1077 | if (portdev->config.nr_ports == virtconconf.nr_ports) { | |
1078 | /* | |
1079 | * Port 0 got hot-added. Since we already did all the | |
1080 | * other initialisation for it, just tell the Host | |
1081 | * that the port is ready. | |
1082 | */ | |
1083 | struct port *port; | |
1084 | ||
1085 | port = find_port_by_id(portdev, 0); | |
1086 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
1087 | return; | |
1088 | } | |
1089 | if (virtconconf.nr_ports > portdev->config.max_nr_ports) { | |
1090 | dev_warn(&vdev->dev, | |
1091 | "More ports specified (%u) than allowed (%u)", | |
1092 | portdev->config.nr_ports + 1, | |
1093 | portdev->config.max_nr_ports); | |
1094 | return; | |
1095 | } | |
1096 | if (virtconconf.nr_ports < portdev->config.nr_ports) | |
1097 | return; | |
1098 | ||
1099 | /* Hot-add ports */ | |
1100 | while (virtconconf.nr_ports - portdev->config.nr_ports) { | |
1101 | err = add_port(portdev, portdev->config.nr_ports); | |
1102 | if (err) | |
1103 | break; | |
1104 | portdev->config.nr_ports++; | |
1105 | } | |
1106 | } | |
1107 | ||
2658a79a AS |
1108 | static int init_vqs(struct ports_device *portdev) |
1109 | { | |
1110 | vq_callback_t **io_callbacks; | |
1111 | char **io_names; | |
1112 | struct virtqueue **vqs; | |
17634ba2 | 1113 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1114 | int err; |
1115 | ||
17634ba2 AS |
1116 | nr_ports = portdev->config.max_nr_ports; |
1117 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1118 | |
1119 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
1120 | if (!vqs) { | |
1121 | err = -ENOMEM; | |
1122 | goto fail; | |
1123 | } | |
1124 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); | |
1125 | if (!io_callbacks) { | |
1126 | err = -ENOMEM; | |
1127 | goto free_vqs; | |
1128 | } | |
1129 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); | |
1130 | if (!io_names) { | |
1131 | err = -ENOMEM; | |
1132 | goto free_callbacks; | |
1133 | } | |
1134 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1135 | GFP_KERNEL); | |
1136 | if (!portdev->in_vqs) { | |
1137 | err = -ENOMEM; | |
1138 | goto free_names; | |
1139 | } | |
1140 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1141 | GFP_KERNEL); | |
1142 | if (!portdev->out_vqs) { | |
1143 | err = -ENOMEM; | |
1144 | goto free_invqs; | |
1145 | } | |
1146 | ||
17634ba2 AS |
1147 | /* |
1148 | * For backward compat (newer host but older guest), the host | |
1149 | * spawns a console port first and also inits the vqs for port | |
1150 | * 0 before others. | |
1151 | */ | |
1152 | j = 0; | |
1153 | io_callbacks[j] = in_intr; | |
1154 | io_callbacks[j + 1] = NULL; | |
1155 | io_names[j] = "input"; | |
1156 | io_names[j + 1] = "output"; | |
1157 | j += 2; | |
1158 | ||
1159 | if (use_multiport(portdev)) { | |
1160 | io_callbacks[j] = control_intr; | |
1161 | io_callbacks[j + 1] = NULL; | |
1162 | io_names[j] = "control-i"; | |
1163 | io_names[j + 1] = "control-o"; | |
1164 | ||
1165 | for (i = 1; i < nr_ports; i++) { | |
1166 | j += 2; | |
1167 | io_callbacks[j] = in_intr; | |
1168 | io_callbacks[j + 1] = NULL; | |
1169 | io_names[j] = "input"; | |
1170 | io_names[j + 1] = "output"; | |
1171 | } | |
1172 | } | |
2658a79a AS |
1173 | /* Find the queues. */ |
1174 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1175 | io_callbacks, | |
1176 | (const char **)io_names); | |
1177 | if (err) | |
1178 | goto free_outvqs; | |
1179 | ||
17634ba2 | 1180 | j = 0; |
2658a79a AS |
1181 | portdev->in_vqs[0] = vqs[0]; |
1182 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1183 | j += 2; |
1184 | if (use_multiport(portdev)) { | |
1185 | portdev->c_ivq = vqs[j]; | |
1186 | portdev->c_ovq = vqs[j + 1]; | |
1187 | ||
1188 | for (i = 1; i < nr_ports; i++) { | |
1189 | j += 2; | |
1190 | portdev->in_vqs[i] = vqs[j]; | |
1191 | portdev->out_vqs[i] = vqs[j + 1]; | |
1192 | } | |
1193 | } | |
2658a79a AS |
1194 | kfree(io_callbacks); |
1195 | kfree(io_names); | |
1196 | kfree(vqs); | |
1197 | ||
1198 | return 0; | |
1199 | ||
1200 | free_names: | |
1201 | kfree(io_names); | |
1202 | free_callbacks: | |
1203 | kfree(io_callbacks); | |
1204 | free_outvqs: | |
1205 | kfree(portdev->out_vqs); | |
1206 | free_invqs: | |
1207 | kfree(portdev->in_vqs); | |
1208 | free_vqs: | |
1209 | kfree(vqs); | |
1210 | fail: | |
1211 | return err; | |
1212 | } | |
1213 | ||
fb08bd27 AS |
1214 | static const struct file_operations portdev_fops = { |
1215 | .owner = THIS_MODULE, | |
1216 | }; | |
1217 | ||
1c85bf35 AS |
1218 | /* |
1219 | * Once we're further in boot, we get probed like any other virtio | |
1220 | * device. | |
17634ba2 AS |
1221 | * |
1222 | * If the host also supports multiple console ports, we check the | |
1223 | * config space to see how many ports the host has spawned. We | |
1224 | * initialize each port found. | |
1c85bf35 AS |
1225 | */ |
1226 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1227 | { | |
1c85bf35 | 1228 | struct ports_device *portdev; |
17634ba2 | 1229 | u32 i; |
1c85bf35 | 1230 | int err; |
17634ba2 | 1231 | bool multiport; |
1c85bf35 AS |
1232 | |
1233 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1234 | if (!portdev) { | |
1235 | err = -ENOMEM; | |
1236 | goto fail; | |
1237 | } | |
1238 | ||
1239 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1240 | portdev->vdev = vdev; | |
1241 | vdev->priv = portdev; | |
1242 | ||
fb08bd27 AS |
1243 | spin_lock_irq(&pdrvdata_lock); |
1244 | portdev->drv_index = pdrvdata.index++; | |
1245 | spin_unlock_irq(&pdrvdata_lock); | |
1246 | ||
1247 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1248 | &portdev_fops); | |
1249 | if (portdev->chr_major < 0) { | |
1250 | dev_err(&vdev->dev, | |
1251 | "Error %d registering chrdev for device %u\n", | |
1252 | portdev->chr_major, portdev->drv_index); | |
1253 | err = portdev->chr_major; | |
1254 | goto free; | |
1255 | } | |
1256 | ||
17634ba2 AS |
1257 | multiport = false; |
1258 | portdev->config.nr_ports = 1; | |
1259 | portdev->config.max_nr_ports = 1; | |
1260 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { | |
1261 | multiport = true; | |
1262 | vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; | |
1263 | ||
1264 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1265 | nr_ports), | |
1266 | &portdev->config.nr_ports, | |
1267 | sizeof(portdev->config.nr_ports)); | |
1268 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1269 | max_nr_ports), | |
1270 | &portdev->config.max_nr_ports, | |
1271 | sizeof(portdev->config.max_nr_ports)); | |
1272 | if (portdev->config.nr_ports > portdev->config.max_nr_ports) { | |
1273 | dev_warn(&vdev->dev, | |
1274 | "More ports (%u) specified than allowed (%u). Will init %u ports.", | |
1275 | portdev->config.nr_ports, | |
1276 | portdev->config.max_nr_ports, | |
1277 | portdev->config.max_nr_ports); | |
1278 | ||
1279 | portdev->config.nr_ports = portdev->config.max_nr_ports; | |
1280 | } | |
1281 | } | |
1282 | ||
1283 | /* Let the Host know we support multiple ports.*/ | |
1284 | vdev->config->finalize_features(vdev); | |
1285 | ||
2658a79a AS |
1286 | err = init_vqs(portdev); |
1287 | if (err < 0) { | |
1288 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1289 | goto free_chrdev; |
2658a79a | 1290 | } |
1c85bf35 | 1291 | |
17634ba2 AS |
1292 | spin_lock_init(&portdev->ports_lock); |
1293 | INIT_LIST_HEAD(&portdev->ports); | |
1294 | ||
1295 | if (multiport) { | |
1296 | spin_lock_init(&portdev->cvq_lock); | |
1297 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
7f5d810d | 1298 | INIT_WORK(&portdev->config_work, &config_work_handler); |
17634ba2 AS |
1299 | |
1300 | fill_queue(portdev->c_ivq, &portdev->cvq_lock); | |
1301 | } | |
1302 | ||
1303 | for (i = 0; i < portdev->config.nr_ports; i++) | |
1304 | add_port(portdev, i); | |
1c85bf35 | 1305 | |
971f3390 RR |
1306 | /* Start using the new console output. */ |
1307 | early_put_chars = NULL; | |
31610434 RR |
1308 | return 0; |
1309 | ||
fb08bd27 AS |
1310 | free_chrdev: |
1311 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1312 | free: |
1c85bf35 | 1313 | kfree(portdev); |
31610434 RR |
1314 | fail: |
1315 | return err; | |
1316 | } | |
1317 | ||
1318 | static struct virtio_device_id id_table[] = { | |
1319 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1320 | { 0 }, | |
1321 | }; | |
1322 | ||
c2983458 CB |
1323 | static unsigned int features[] = { |
1324 | VIRTIO_CONSOLE_F_SIZE, | |
17634ba2 | 1325 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1326 | }; |
1327 | ||
31610434 | 1328 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1329 | .feature_table = features, |
1330 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1331 | .driver.name = KBUILD_MODNAME, |
1332 | .driver.owner = THIS_MODULE, | |
1333 | .id_table = id_table, | |
1334 | .probe = virtcons_probe, | |
7f5d810d | 1335 | .config_changed = config_intr, |
31610434 RR |
1336 | }; |
1337 | ||
1338 | static int __init init(void) | |
1339 | { | |
fb08bd27 AS |
1340 | int err; |
1341 | ||
1342 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
1343 | if (IS_ERR(pdrvdata.class)) { | |
1344 | err = PTR_ERR(pdrvdata.class); | |
1345 | pr_err("Error %d creating virtio-ports class\n", err); | |
1346 | return err; | |
1347 | } | |
38edf58d AS |
1348 | INIT_LIST_HEAD(&pdrvdata.consoles); |
1349 | ||
31610434 RR |
1350 | return register_virtio_driver(&virtio_console); |
1351 | } | |
1352 | module_init(init); | |
1353 | ||
1354 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1355 | MODULE_DESCRIPTION("Virtio console driver"); | |
1356 | MODULE_LICENSE("GPL"); |