Commit | Line | Data |
---|---|---|
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 | 19 | #include <linux/cdev.h> |
d99393ef | 20 | #include <linux/debugfs.h> |
fb08bd27 | 21 | #include <linux/device.h> |
31610434 | 22 | #include <linux/err.h> |
2030fa49 | 23 | #include <linux/fs.h> |
31610434 | 24 | #include <linux/init.h> |
38edf58d | 25 | #include <linux/list.h> |
2030fa49 AS |
26 | #include <linux/poll.h> |
27 | #include <linux/sched.h> | |
38edf58d | 28 | #include <linux/spinlock.h> |
31610434 RR |
29 | #include <linux/virtio.h> |
30 | #include <linux/virtio_console.h> | |
2030fa49 | 31 | #include <linux/wait.h> |
17634ba2 | 32 | #include <linux/workqueue.h> |
31610434 RR |
33 | #include "hvc_console.h" |
34 | ||
38edf58d AS |
35 | /* |
36 | * This is a global struct for storing common data for all the devices | |
37 | * this driver handles. | |
38 | * | |
39 | * Mainly, it has a linked list for all the consoles in one place so | |
40 | * that callbacks from hvc for get_chars(), put_chars() work properly | |
41 | * across multiple devices and multiple ports per device. | |
42 | */ | |
43 | struct ports_driver_data { | |
fb08bd27 AS |
44 | /* Used for registering chardevs */ |
45 | struct class *class; | |
46 | ||
d99393ef AS |
47 | /* Used for exporting per-port information to debugfs */ |
48 | struct dentry *debugfs_dir; | |
49 | ||
fb08bd27 AS |
50 | /* Number of devices this driver is handling */ |
51 | unsigned int index; | |
52 | ||
d8a02bd5 RR |
53 | /* |
54 | * This is used to keep track of the number of hvc consoles | |
55 | * spawned by this driver. This number is given as the first | |
56 | * argument to hvc_alloc(). To correctly map an initial | |
57 | * console spawned via hvc_instantiate to the console being | |
58 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
59 | * | |
60 | * We also just assume the first console being initialised was | |
61 | * the first one that got used as the initial console. | |
62 | */ | |
63 | unsigned int next_vtermno; | |
64 | ||
38edf58d AS |
65 | /* All the console devices handled by this driver */ |
66 | struct list_head consoles; | |
67 | }; | |
68 | static struct ports_driver_data pdrvdata; | |
69 | ||
70 | DEFINE_SPINLOCK(pdrvdata_lock); | |
71 | ||
4f23c573 AS |
72 | /* This struct holds information that's relevant only for console ports */ |
73 | struct console { | |
74 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
75 | struct list_head list; | |
76 | ||
77 | /* The hvc device associated with this console port */ | |
78 | struct hvc_struct *hvc; | |
79 | ||
80 | /* | |
81 | * This number identifies the number that we used to register | |
82 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
83 | * number passed on by the hvc callbacks to us to | |
84 | * differentiate between the other console ports handled by | |
85 | * this driver | |
86 | */ | |
87 | u32 vtermno; | |
88 | }; | |
89 | ||
fdb9a054 AS |
90 | struct port_buffer { |
91 | char *buf; | |
92 | ||
93 | /* size of the buffer in *buf above */ | |
94 | size_t size; | |
95 | ||
96 | /* used length of the buffer */ | |
97 | size_t len; | |
98 | /* offset in the buf from which to consume data */ | |
99 | size_t offset; | |
100 | }; | |
101 | ||
17634ba2 AS |
102 | /* |
103 | * This is a per-device struct that stores data common to all the | |
104 | * ports for that device (vdev->priv). | |
105 | */ | |
106 | struct ports_device { | |
107 | /* | |
108 | * Workqueue handlers where we process deferred work after | |
109 | * notification | |
110 | */ | |
111 | struct work_struct control_work; | |
7f5d810d | 112 | struct work_struct config_work; |
17634ba2 AS |
113 | |
114 | struct list_head ports; | |
115 | ||
116 | /* To protect the list of ports */ | |
117 | spinlock_t ports_lock; | |
118 | ||
119 | /* To protect the vq operations for the control channel */ | |
120 | spinlock_t cvq_lock; | |
121 | ||
122 | /* The current config space is stored here */ | |
123 | struct virtio_console_config config; | |
124 | ||
125 | /* The virtio device we're associated with */ | |
126 | struct virtio_device *vdev; | |
127 | ||
128 | /* | |
129 | * A couple of virtqueues for the control channel: one for | |
130 | * guest->host transfers, one for host->guest transfers | |
131 | */ | |
132 | struct virtqueue *c_ivq, *c_ovq; | |
133 | ||
134 | /* Array of per-port IO virtqueues */ | |
135 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
136 | |
137 | /* Used for numbering devices for sysfs and debugfs */ | |
138 | unsigned int drv_index; | |
139 | ||
140 | /* Major number for this device. Ports will be created as minors. */ | |
141 | int chr_major; | |
17634ba2 AS |
142 | }; |
143 | ||
1c85bf35 | 144 | /* This struct holds the per-port data */ |
21206ede | 145 | struct port { |
17634ba2 AS |
146 | /* Next port in the list, head is in the ports_device */ |
147 | struct list_head list; | |
148 | ||
1c85bf35 AS |
149 | /* Pointer to the parent virtio_console device */ |
150 | struct ports_device *portdev; | |
fdb9a054 AS |
151 | |
152 | /* The current buffer from which data has to be fed to readers */ | |
153 | struct port_buffer *inbuf; | |
21206ede | 154 | |
203baab8 AS |
155 | /* |
156 | * To protect the operations on the in_vq associated with this | |
157 | * port. Has to be a spinlock because it can be called from | |
158 | * interrupt context (get_char()). | |
159 | */ | |
160 | spinlock_t inbuf_lock; | |
161 | ||
1c85bf35 AS |
162 | /* The IO vqs for this port */ |
163 | struct virtqueue *in_vq, *out_vq; | |
164 | ||
d99393ef AS |
165 | /* File in the debugfs directory that exposes this port's information */ |
166 | struct dentry *debugfs_file; | |
167 | ||
4f23c573 AS |
168 | /* |
169 | * The entries in this struct will be valid if this port is | |
170 | * hooked up to an hvc console | |
171 | */ | |
172 | struct console cons; | |
17634ba2 | 173 | |
fb08bd27 AS |
174 | /* Each port associates with a separate char device */ |
175 | struct cdev cdev; | |
176 | struct device *dev; | |
177 | ||
2030fa49 AS |
178 | /* A waitqueue for poll() or blocking read operations */ |
179 | wait_queue_head_t waitqueue; | |
180 | ||
431edb8a AS |
181 | /* The 'name' of the port that we expose via sysfs properties */ |
182 | char *name; | |
183 | ||
17634ba2 AS |
184 | /* The 'id' to identify the port with the Host */ |
185 | u32 id; | |
2030fa49 AS |
186 | |
187 | /* Is the host device open */ | |
188 | bool host_connected; | |
3c7969cc AS |
189 | |
190 | /* We should allow only one process to open a port */ | |
191 | bool guest_connected; | |
21206ede | 192 | }; |
31610434 | 193 | |
971f3390 RR |
194 | /* This is the very early arch-specified put chars function. */ |
195 | static int (*early_put_chars)(u32, const char *, int); | |
196 | ||
38edf58d AS |
197 | static struct port *find_port_by_vtermno(u32 vtermno) |
198 | { | |
199 | struct port *port; | |
4f23c573 | 200 | struct console *cons; |
38edf58d AS |
201 | unsigned long flags; |
202 | ||
203 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
204 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
205 | if (cons->vtermno == vtermno) { | |
206 | port = container_of(cons, struct port, cons); | |
38edf58d | 207 | goto out; |
4f23c573 | 208 | } |
38edf58d AS |
209 | } |
210 | port = NULL; | |
211 | out: | |
212 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
213 | return port; | |
214 | } | |
215 | ||
17634ba2 AS |
216 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
217 | { | |
218 | struct port *port; | |
219 | unsigned long flags; | |
220 | ||
221 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
222 | list_for_each_entry(port, &portdev->ports, list) | |
223 | if (port->id == id) | |
224 | goto out; | |
225 | port = NULL; | |
226 | out: | |
227 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
228 | ||
229 | return port; | |
230 | } | |
231 | ||
203baab8 AS |
232 | static struct port *find_port_by_vq(struct ports_device *portdev, |
233 | struct virtqueue *vq) | |
234 | { | |
235 | struct port *port; | |
203baab8 AS |
236 | unsigned long flags; |
237 | ||
17634ba2 AS |
238 | spin_lock_irqsave(&portdev->ports_lock, flags); |
239 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
240 | if (port->in_vq == vq || port->out_vq == vq) |
241 | goto out; | |
203baab8 AS |
242 | port = NULL; |
243 | out: | |
17634ba2 | 244 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
245 | return port; |
246 | } | |
247 | ||
17634ba2 AS |
248 | static bool is_console_port(struct port *port) |
249 | { | |
250 | if (port->cons.hvc) | |
251 | return true; | |
252 | return false; | |
253 | } | |
254 | ||
255 | static inline bool use_multiport(struct ports_device *portdev) | |
256 | { | |
257 | /* | |
258 | * This condition can be true when put_chars is called from | |
259 | * early_init | |
260 | */ | |
261 | if (!portdev->vdev) | |
262 | return 0; | |
263 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
264 | } | |
265 | ||
fdb9a054 AS |
266 | static void free_buf(struct port_buffer *buf) |
267 | { | |
268 | kfree(buf->buf); | |
269 | kfree(buf); | |
270 | } | |
271 | ||
272 | static struct port_buffer *alloc_buf(size_t buf_size) | |
273 | { | |
274 | struct port_buffer *buf; | |
275 | ||
276 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
277 | if (!buf) | |
278 | goto fail; | |
279 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
280 | if (!buf->buf) | |
281 | goto free_buf; | |
282 | buf->len = 0; | |
283 | buf->offset = 0; | |
284 | buf->size = buf_size; | |
285 | return buf; | |
286 | ||
287 | free_buf: | |
288 | kfree(buf); | |
289 | fail: | |
290 | return NULL; | |
291 | } | |
292 | ||
a3cde449 AS |
293 | /* Callers should take appropriate locks */ |
294 | static void *get_inbuf(struct port *port) | |
295 | { | |
296 | struct port_buffer *buf; | |
297 | struct virtqueue *vq; | |
298 | unsigned int len; | |
299 | ||
300 | vq = port->in_vq; | |
301 | buf = vq->vq_ops->get_buf(vq, &len); | |
302 | if (buf) { | |
303 | buf->len = len; | |
304 | buf->offset = 0; | |
305 | } | |
306 | return buf; | |
307 | } | |
308 | ||
e27b5198 AS |
309 | /* |
310 | * Create a scatter-gather list representing our input buffer and put | |
311 | * it in the queue. | |
312 | * | |
313 | * Callers should take appropriate locks. | |
314 | */ | |
203baab8 | 315 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
316 | { |
317 | struct scatterlist sg[1]; | |
203baab8 | 318 | int ret; |
1c85bf35 | 319 | |
e27b5198 AS |
320 | sg_init_one(sg, buf->buf, buf->size); |
321 | ||
203baab8 | 322 | ret = vq->vq_ops->add_buf(vq, sg, 0, 1, buf); |
e27b5198 | 323 | vq->vq_ops->kick(vq); |
203baab8 AS |
324 | return ret; |
325 | } | |
326 | ||
88f251ac AS |
327 | /* Discard any unread data this port has. Callers lockers. */ |
328 | static void discard_port_data(struct port *port) | |
329 | { | |
330 | struct port_buffer *buf; | |
331 | struct virtqueue *vq; | |
332 | unsigned int len; | |
333 | ||
334 | vq = port->in_vq; | |
335 | if (port->inbuf) | |
336 | buf = port->inbuf; | |
337 | else | |
338 | buf = vq->vq_ops->get_buf(vq, &len); | |
339 | ||
340 | if (!buf) | |
341 | return; | |
342 | ||
343 | if (add_inbuf(vq, buf) < 0) { | |
344 | buf->len = buf->offset = 0; | |
345 | dev_warn(port->dev, "Error adding buffer back to vq\n"); | |
346 | return; | |
347 | } | |
348 | ||
349 | port->inbuf = NULL; | |
350 | } | |
351 | ||
203baab8 AS |
352 | static bool port_has_data(struct port *port) |
353 | { | |
354 | unsigned long flags; | |
355 | bool ret; | |
356 | ||
357 | ret = false; | |
358 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
359 | if (port->inbuf) | |
360 | ret = true; | |
361 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
362 | ||
363 | return ret; | |
364 | } | |
365 | ||
17634ba2 AS |
366 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
367 | unsigned int value) | |
368 | { | |
369 | struct scatterlist sg[1]; | |
370 | struct virtio_console_control cpkt; | |
371 | struct virtqueue *vq; | |
372 | int len; | |
373 | ||
374 | if (!use_multiport(port->portdev)) | |
375 | return 0; | |
376 | ||
377 | cpkt.id = port->id; | |
378 | cpkt.event = event; | |
379 | cpkt.value = value; | |
380 | ||
381 | vq = port->portdev->c_ovq; | |
382 | ||
383 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
384 | if (vq->vq_ops->add_buf(vq, sg, 1, 0, &cpkt) >= 0) { | |
385 | vq->vq_ops->kick(vq); | |
386 | while (!vq->vq_ops->get_buf(vq, &len)) | |
387 | cpu_relax(); | |
388 | } | |
389 | return 0; | |
390 | } | |
391 | ||
f997f00b AS |
392 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count) |
393 | { | |
394 | struct scatterlist sg[1]; | |
395 | struct virtqueue *out_vq; | |
396 | ssize_t ret; | |
397 | unsigned int len; | |
398 | ||
399 | out_vq = port->out_vq; | |
400 | ||
401 | sg_init_one(sg, in_buf, in_count); | |
402 | ret = out_vq->vq_ops->add_buf(out_vq, sg, 1, 0, in_buf); | |
403 | ||
404 | /* Tell Host to go! */ | |
405 | out_vq->vq_ops->kick(out_vq); | |
406 | ||
407 | if (ret < 0) { | |
408 | len = 0; | |
409 | goto fail; | |
410 | } | |
411 | ||
412 | /* | |
413 | * Wait till the host acknowledges it pushed out the data we | |
414 | * sent. Also ensure we return to userspace the number of | |
415 | * bytes that were successfully consumed by the host. | |
416 | */ | |
417 | while (!out_vq->vq_ops->get_buf(out_vq, &len)) | |
418 | cpu_relax(); | |
419 | fail: | |
420 | /* We're expected to return the amount of data we wrote */ | |
421 | return len; | |
422 | } | |
423 | ||
203baab8 AS |
424 | /* |
425 | * Give out the data that's requested from the buffer that we have | |
426 | * queued up. | |
427 | */ | |
b766ceed AS |
428 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
429 | bool to_user) | |
203baab8 AS |
430 | { |
431 | struct port_buffer *buf; | |
432 | unsigned long flags; | |
433 | ||
434 | if (!out_count || !port_has_data(port)) | |
435 | return 0; | |
436 | ||
437 | buf = port->inbuf; | |
b766ceed | 438 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 439 | |
b766ceed AS |
440 | if (to_user) { |
441 | ssize_t ret; | |
442 | ||
443 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
444 | if (ret) | |
445 | return -EFAULT; | |
446 | } else { | |
447 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
448 | } | |
203baab8 | 449 | |
203baab8 AS |
450 | buf->offset += out_count; |
451 | ||
452 | if (buf->offset == buf->len) { | |
453 | /* | |
454 | * We're done using all the data in this buffer. | |
455 | * Re-queue so that the Host can send us more data. | |
456 | */ | |
457 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
458 | port->inbuf = NULL; | |
459 | ||
460 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 461 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
462 | |
463 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
464 | } | |
b766ceed | 465 | /* Return the number of bytes actually copied */ |
203baab8 | 466 | return out_count; |
e27b5198 AS |
467 | } |
468 | ||
2030fa49 AS |
469 | /* The condition that must be true for polling to end */ |
470 | static bool wait_is_over(struct port *port) | |
471 | { | |
472 | return port_has_data(port) || !port->host_connected; | |
473 | } | |
474 | ||
475 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, | |
476 | size_t count, loff_t *offp) | |
477 | { | |
478 | struct port *port; | |
479 | ssize_t ret; | |
480 | ||
481 | port = filp->private_data; | |
482 | ||
483 | if (!port_has_data(port)) { | |
484 | /* | |
485 | * If nothing's connected on the host just return 0 in | |
486 | * case of list_empty; this tells the userspace app | |
487 | * that there's no connection | |
488 | */ | |
489 | if (!port->host_connected) | |
490 | return 0; | |
491 | if (filp->f_flags & O_NONBLOCK) | |
492 | return -EAGAIN; | |
493 | ||
494 | ret = wait_event_interruptible(port->waitqueue, | |
495 | wait_is_over(port)); | |
496 | if (ret < 0) | |
497 | return ret; | |
498 | } | |
499 | /* | |
500 | * We could've received a disconnection message while we were | |
501 | * waiting for more data. | |
502 | * | |
503 | * This check is not clubbed in the if() statement above as we | |
504 | * might receive some data as well as the host could get | |
505 | * disconnected after we got woken up from our wait. So we | |
506 | * really want to give off whatever data we have and only then | |
507 | * check for host_connected. | |
508 | */ | |
509 | if (!port_has_data(port) && !port->host_connected) | |
510 | return 0; | |
511 | ||
512 | return fill_readbuf(port, ubuf, count, true); | |
513 | } | |
514 | ||
515 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
516 | size_t count, loff_t *offp) | |
517 | { | |
518 | struct port *port; | |
519 | char *buf; | |
520 | ssize_t ret; | |
521 | ||
522 | port = filp->private_data; | |
523 | ||
524 | count = min((size_t)(32 * 1024), count); | |
525 | ||
526 | buf = kmalloc(count, GFP_KERNEL); | |
527 | if (!buf) | |
528 | return -ENOMEM; | |
529 | ||
530 | ret = copy_from_user(buf, ubuf, count); | |
531 | if (ret) { | |
532 | ret = -EFAULT; | |
533 | goto free_buf; | |
534 | } | |
535 | ||
536 | ret = send_buf(port, buf, count); | |
537 | free_buf: | |
538 | kfree(buf); | |
539 | return ret; | |
540 | } | |
541 | ||
542 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
543 | { | |
544 | struct port *port; | |
545 | unsigned int ret; | |
546 | ||
547 | port = filp->private_data; | |
548 | poll_wait(filp, &port->waitqueue, wait); | |
549 | ||
550 | ret = 0; | |
551 | if (port->inbuf) | |
552 | ret |= POLLIN | POLLRDNORM; | |
553 | if (port->host_connected) | |
554 | ret |= POLLOUT; | |
555 | if (!port->host_connected) | |
556 | ret |= POLLHUP; | |
557 | ||
558 | return ret; | |
559 | } | |
560 | ||
561 | static int port_fops_release(struct inode *inode, struct file *filp) | |
562 | { | |
563 | struct port *port; | |
564 | ||
565 | port = filp->private_data; | |
566 | ||
567 | /* Notify host of port being closed */ | |
568 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
569 | ||
88f251ac | 570 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
571 | port->guest_connected = false; |
572 | ||
88f251ac AS |
573 | discard_port_data(port); |
574 | ||
575 | spin_unlock_irq(&port->inbuf_lock); | |
576 | ||
2030fa49 AS |
577 | return 0; |
578 | } | |
579 | ||
580 | static int port_fops_open(struct inode *inode, struct file *filp) | |
581 | { | |
582 | struct cdev *cdev = inode->i_cdev; | |
583 | struct port *port; | |
584 | ||
585 | port = container_of(cdev, struct port, cdev); | |
586 | filp->private_data = port; | |
587 | ||
588 | /* | |
589 | * Don't allow opening of console port devices -- that's done | |
590 | * via /dev/hvc | |
591 | */ | |
592 | if (is_console_port(port)) | |
593 | return -ENXIO; | |
594 | ||
3c7969cc AS |
595 | /* Allow only one process to open a particular port at a time */ |
596 | spin_lock_irq(&port->inbuf_lock); | |
597 | if (port->guest_connected) { | |
598 | spin_unlock_irq(&port->inbuf_lock); | |
599 | return -EMFILE; | |
600 | } | |
601 | ||
602 | port->guest_connected = true; | |
603 | spin_unlock_irq(&port->inbuf_lock); | |
604 | ||
2030fa49 AS |
605 | /* Notify host of port being opened */ |
606 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
611 | /* | |
612 | * The file operations that we support: programs in the guest can open | |
613 | * a console device, read from it, write to it, poll for data and | |
614 | * close it. The devices are at | |
615 | * /dev/vport<device number>p<port number> | |
616 | */ | |
617 | static const struct file_operations port_fops = { | |
618 | .owner = THIS_MODULE, | |
619 | .open = port_fops_open, | |
620 | .read = port_fops_read, | |
621 | .write = port_fops_write, | |
622 | .poll = port_fops_poll, | |
623 | .release = port_fops_release, | |
624 | }; | |
625 | ||
a23ea924 RR |
626 | /* |
627 | * The put_chars() callback is pretty straightforward. | |
31610434 | 628 | * |
a23ea924 RR |
629 | * We turn the characters into a scatter-gather list, add it to the |
630 | * output queue and then kick the Host. Then we sit here waiting for | |
631 | * it to finish: inefficient in theory, but in practice | |
632 | * implementations will do it immediately (lguest's Launcher does). | |
633 | */ | |
31610434 RR |
634 | static int put_chars(u32 vtermno, const char *buf, int count) |
635 | { | |
21206ede | 636 | struct port *port; |
38edf58d AS |
637 | |
638 | port = find_port_by_vtermno(vtermno); | |
639 | if (!port) | |
640 | return 0; | |
31610434 | 641 | |
971f3390 RR |
642 | if (unlikely(early_put_chars)) |
643 | return early_put_chars(vtermno, buf, count); | |
644 | ||
f997f00b | 645 | return send_buf(port, (void *)buf, count); |
31610434 RR |
646 | } |
647 | ||
a23ea924 RR |
648 | /* |
649 | * get_chars() is the callback from the hvc_console infrastructure | |
650 | * when an interrupt is received. | |
31610434 | 651 | * |
203baab8 AS |
652 | * We call out to fill_readbuf that gets us the required data from the |
653 | * buffers that are queued up. | |
a23ea924 | 654 | */ |
31610434 RR |
655 | static int get_chars(u32 vtermno, char *buf, int count) |
656 | { | |
21206ede RR |
657 | struct port *port; |
658 | ||
38edf58d AS |
659 | port = find_port_by_vtermno(vtermno); |
660 | if (!port) | |
661 | return 0; | |
21206ede | 662 | |
31610434 | 663 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 664 | BUG_ON(!port->in_vq); |
31610434 | 665 | |
b766ceed | 666 | return fill_readbuf(port, buf, count, false); |
31610434 | 667 | } |
31610434 | 668 | |
cb06e367 | 669 | static void resize_console(struct port *port) |
c2983458 | 670 | { |
cb06e367 | 671 | struct virtio_device *vdev; |
c2983458 CB |
672 | struct winsize ws; |
673 | ||
cb06e367 AS |
674 | vdev = port->portdev->vdev; |
675 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) { | |
676 | vdev->config->get(vdev, | |
677 | offsetof(struct virtio_console_config, cols), | |
678 | &ws.ws_col, sizeof(u16)); | |
679 | vdev->config->get(vdev, | |
680 | offsetof(struct virtio_console_config, rows), | |
681 | &ws.ws_row, sizeof(u16)); | |
4f23c573 | 682 | hvc_resize(port->cons.hvc, ws); |
c2983458 CB |
683 | } |
684 | } | |
685 | ||
38edf58d | 686 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
687 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
688 | { | |
38edf58d AS |
689 | struct port *port; |
690 | ||
691 | port = find_port_by_vtermno(hp->vtermno); | |
692 | if (!port) | |
693 | return -EINVAL; | |
694 | ||
91fcad19 | 695 | hp->irq_requested = 1; |
cb06e367 | 696 | resize_console(port); |
c2983458 | 697 | |
91fcad19 CB |
698 | return 0; |
699 | } | |
700 | ||
701 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
702 | { | |
703 | hp->irq_requested = 0; | |
704 | } | |
705 | ||
17634ba2 | 706 | /* The operations for console ports. */ |
1dff3996 | 707 | static const struct hv_ops hv_ops = { |
971f3390 RR |
708 | .get_chars = get_chars, |
709 | .put_chars = put_chars, | |
710 | .notifier_add = notifier_add_vio, | |
711 | .notifier_del = notifier_del_vio, | |
712 | .notifier_hangup = notifier_del_vio, | |
713 | }; | |
714 | ||
715 | /* | |
716 | * Console drivers are initialized very early so boot messages can go | |
717 | * out, so we do things slightly differently from the generic virtio | |
718 | * initialization of the net and block drivers. | |
719 | * | |
720 | * At this stage, the console is output-only. It's too early to set | |
721 | * up a virtqueue, so we let the drivers do some boutique early-output | |
722 | * thing. | |
723 | */ | |
724 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
725 | { | |
726 | early_put_chars = put_chars; | |
727 | return hvc_instantiate(0, 0, &hv_ops); | |
728 | } | |
729 | ||
17634ba2 | 730 | int init_port_console(struct port *port) |
cfa6d379 AS |
731 | { |
732 | int ret; | |
733 | ||
734 | /* | |
735 | * The Host's telling us this port is a console port. Hook it | |
736 | * up with an hvc console. | |
737 | * | |
738 | * To set up and manage our virtual console, we call | |
739 | * hvc_alloc(). | |
740 | * | |
741 | * The first argument of hvc_alloc() is the virtual console | |
742 | * number. The second argument is the parameter for the | |
743 | * notification mechanism (like irq number). We currently | |
744 | * leave this as zero, virtqueues have implicit notifications. | |
745 | * | |
746 | * The third argument is a "struct hv_ops" containing the | |
747 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
748 | * pointers. The final argument is the output buffer size: we | |
749 | * can do any size, so we put PAGE_SIZE here. | |
750 | */ | |
751 | port->cons.vtermno = pdrvdata.next_vtermno; | |
752 | ||
753 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
754 | if (IS_ERR(port->cons.hvc)) { | |
755 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
756 | dev_err(port->dev, |
757 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
758 | port->cons.hvc = NULL; |
759 | return ret; | |
760 | } | |
761 | spin_lock_irq(&pdrvdata_lock); | |
762 | pdrvdata.next_vtermno++; | |
763 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
764 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 765 | port->guest_connected = true; |
cfa6d379 | 766 | |
2030fa49 AS |
767 | /* Notify host of port being opened */ |
768 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
769 | ||
cfa6d379 AS |
770 | return 0; |
771 | } | |
772 | ||
431edb8a AS |
773 | static ssize_t show_port_name(struct device *dev, |
774 | struct device_attribute *attr, char *buffer) | |
775 | { | |
776 | struct port *port; | |
777 | ||
778 | port = dev_get_drvdata(dev); | |
779 | ||
780 | return sprintf(buffer, "%s\n", port->name); | |
781 | } | |
782 | ||
783 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
784 | ||
785 | static struct attribute *port_sysfs_entries[] = { | |
786 | &dev_attr_name.attr, | |
787 | NULL | |
788 | }; | |
789 | ||
790 | static struct attribute_group port_attribute_group = { | |
791 | .name = NULL, /* put in device directory */ | |
792 | .attrs = port_sysfs_entries, | |
793 | }; | |
794 | ||
d99393ef AS |
795 | static int debugfs_open(struct inode *inode, struct file *filp) |
796 | { | |
797 | filp->private_data = inode->i_private; | |
798 | return 0; | |
799 | } | |
800 | ||
801 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, | |
802 | size_t count, loff_t *offp) | |
803 | { | |
804 | struct port *port; | |
805 | char *buf; | |
806 | ssize_t ret, out_offset, out_count; | |
807 | ||
808 | out_count = 1024; | |
809 | buf = kmalloc(out_count, GFP_KERNEL); | |
810 | if (!buf) | |
811 | return -ENOMEM; | |
812 | ||
813 | port = filp->private_data; | |
814 | out_offset = 0; | |
815 | out_offset += snprintf(buf + out_offset, out_count, | |
816 | "name: %s\n", port->name ? port->name : ""); | |
817 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
818 | "guest_connected: %d\n", port->guest_connected); | |
819 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
820 | "host_connected: %d\n", port->host_connected); | |
821 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
822 | "is_console: %s\n", | |
823 | is_console_port(port) ? "yes" : "no"); | |
824 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
825 | "console_vtermno: %u\n", port->cons.vtermno); | |
826 | ||
827 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
828 | kfree(buf); | |
829 | return ret; | |
830 | } | |
831 | ||
832 | static const struct file_operations port_debugfs_ops = { | |
833 | .owner = THIS_MODULE, | |
834 | .open = debugfs_open, | |
835 | .read = debugfs_read, | |
836 | }; | |
837 | ||
1f7aa42d AS |
838 | /* Remove all port-specific data. */ |
839 | static int remove_port(struct port *port) | |
840 | { | |
841 | spin_lock_irq(&port->portdev->ports_lock); | |
842 | list_del(&port->list); | |
843 | spin_unlock_irq(&port->portdev->ports_lock); | |
844 | ||
845 | if (is_console_port(port)) { | |
846 | spin_lock_irq(&pdrvdata_lock); | |
847 | list_del(&port->cons.list); | |
848 | spin_unlock_irq(&pdrvdata_lock); | |
849 | hvc_remove(port->cons.hvc); | |
850 | } | |
851 | if (port->guest_connected) | |
852 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
853 | ||
854 | while (port->in_vq->vq_ops->detach_unused_buf(port->in_vq)) | |
855 | ; | |
856 | ||
857 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); | |
858 | device_destroy(pdrvdata.class, port->dev->devt); | |
859 | cdev_del(&port->cdev); | |
860 | ||
861 | discard_port_data(port); | |
862 | kfree(port->name); | |
863 | ||
d99393ef AS |
864 | debugfs_remove(port->debugfs_file); |
865 | ||
1f7aa42d AS |
866 | kfree(port); |
867 | return 0; | |
868 | } | |
869 | ||
17634ba2 AS |
870 | /* Any private messages that the Host and Guest want to share */ |
871 | static void handle_control_message(struct ports_device *portdev, | |
872 | struct port_buffer *buf) | |
873 | { | |
874 | struct virtio_console_control *cpkt; | |
875 | struct port *port; | |
431edb8a AS |
876 | size_t name_size; |
877 | int err; | |
17634ba2 AS |
878 | |
879 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
880 | ||
881 | port = find_port_by_id(portdev, cpkt->id); | |
882 | if (!port) { | |
883 | /* No valid header at start of buffer. Drop it. */ | |
884 | dev_dbg(&portdev->vdev->dev, | |
885 | "Invalid index %u in control packet\n", cpkt->id); | |
886 | return; | |
887 | } | |
888 | ||
889 | switch (cpkt->event) { | |
890 | case VIRTIO_CONSOLE_CONSOLE_PORT: | |
891 | if (!cpkt->value) | |
892 | break; | |
893 | if (is_console_port(port)) | |
894 | break; | |
895 | ||
896 | init_port_console(port); | |
897 | /* | |
898 | * Could remove the port here in case init fails - but | |
899 | * have to notify the host first. | |
900 | */ | |
901 | break; | |
902 | case VIRTIO_CONSOLE_RESIZE: | |
903 | if (!is_console_port(port)) | |
904 | break; | |
905 | port->cons.hvc->irq_requested = 1; | |
906 | resize_console(port); | |
907 | break; | |
2030fa49 AS |
908 | case VIRTIO_CONSOLE_PORT_OPEN: |
909 | port->host_connected = cpkt->value; | |
910 | wake_up_interruptible(&port->waitqueue); | |
911 | break; | |
431edb8a AS |
912 | case VIRTIO_CONSOLE_PORT_NAME: |
913 | /* | |
914 | * Skip the size of the header and the cpkt to get the size | |
915 | * of the name that was sent | |
916 | */ | |
917 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
918 | ||
919 | port->name = kmalloc(name_size, GFP_KERNEL); | |
920 | if (!port->name) { | |
921 | dev_err(port->dev, | |
922 | "Not enough space to store port name\n"); | |
923 | break; | |
924 | } | |
925 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
926 | name_size - 1); | |
927 | port->name[name_size - 1] = 0; | |
928 | ||
929 | /* | |
930 | * Since we only have one sysfs attribute, 'name', | |
931 | * create it only if we have a name for the port. | |
932 | */ | |
933 | err = sysfs_create_group(&port->dev->kobj, | |
934 | &port_attribute_group); | |
935 | if (err) | |
936 | dev_err(port->dev, | |
937 | "Error %d creating sysfs device attributes\n", | |
938 | err); | |
939 | ||
940 | break; | |
1f7aa42d AS |
941 | case VIRTIO_CONSOLE_PORT_REMOVE: |
942 | /* | |
943 | * Hot unplug the port. We don't decrement nr_ports | |
944 | * since we don't want to deal with extra complexities | |
945 | * of using the lowest-available port id: We can just | |
946 | * pick up the nr_ports number as the id and not have | |
947 | * userspace send it to us. This helps us in two | |
948 | * ways: | |
949 | * | |
950 | * - We don't need to have a 'port_id' field in the | |
951 | * config space when a port is hot-added. This is a | |
952 | * good thing as we might queue up multiple hotplug | |
953 | * requests issued in our workqueue. | |
954 | * | |
955 | * - Another way to deal with this would have been to | |
956 | * use a bitmap of the active ports and select the | |
957 | * lowest non-active port from that map. That | |
958 | * bloats the already tight config space and we | |
959 | * would end up artificially limiting the | |
960 | * max. number of ports to sizeof(bitmap). Right | |
961 | * now we can support 2^32 ports (as the port id is | |
962 | * stored in a u32 type). | |
963 | * | |
964 | */ | |
965 | remove_port(port); | |
966 | break; | |
17634ba2 AS |
967 | } |
968 | } | |
969 | ||
970 | static void control_work_handler(struct work_struct *work) | |
971 | { | |
972 | struct ports_device *portdev; | |
973 | struct virtqueue *vq; | |
974 | struct port_buffer *buf; | |
975 | unsigned int len; | |
976 | ||
977 | portdev = container_of(work, struct ports_device, control_work); | |
978 | vq = portdev->c_ivq; | |
979 | ||
980 | spin_lock(&portdev->cvq_lock); | |
981 | while ((buf = vq->vq_ops->get_buf(vq, &len))) { | |
982 | spin_unlock(&portdev->cvq_lock); | |
983 | ||
984 | buf->len = len; | |
985 | buf->offset = 0; | |
986 | ||
987 | handle_control_message(portdev, buf); | |
988 | ||
989 | spin_lock(&portdev->cvq_lock); | |
990 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
991 | dev_warn(&portdev->vdev->dev, | |
992 | "Error adding buffer to queue\n"); | |
993 | free_buf(buf); | |
994 | } | |
995 | } | |
996 | spin_unlock(&portdev->cvq_lock); | |
997 | } | |
998 | ||
999 | static void in_intr(struct virtqueue *vq) | |
1000 | { | |
1001 | struct port *port; | |
1002 | unsigned long flags; | |
1003 | ||
1004 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1005 | if (!port) | |
1006 | return; | |
1007 | ||
1008 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
1009 | port->inbuf = get_inbuf(port); | |
1010 | ||
88f251ac AS |
1011 | /* |
1012 | * Don't queue up data when port is closed. This condition | |
1013 | * can be reached when a console port is not yet connected (no | |
1014 | * tty is spawned) and the host sends out data to console | |
1015 | * ports. For generic serial ports, the host won't | |
1016 | * (shouldn't) send data till the guest is connected. | |
1017 | */ | |
1018 | if (!port->guest_connected) | |
1019 | discard_port_data(port); | |
1020 | ||
17634ba2 AS |
1021 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1022 | ||
2030fa49 AS |
1023 | wake_up_interruptible(&port->waitqueue); |
1024 | ||
17634ba2 AS |
1025 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1026 | hvc_kick(); | |
1027 | } | |
1028 | ||
1029 | static void control_intr(struct virtqueue *vq) | |
1030 | { | |
1031 | struct ports_device *portdev; | |
1032 | ||
1033 | portdev = vq->vdev->priv; | |
1034 | schedule_work(&portdev->control_work); | |
1035 | } | |
1036 | ||
7f5d810d AS |
1037 | static void config_intr(struct virtio_device *vdev) |
1038 | { | |
1039 | struct ports_device *portdev; | |
1040 | ||
1041 | portdev = vdev->priv; | |
1042 | if (use_multiport(portdev)) { | |
1043 | /* Handle port hot-add */ | |
1044 | schedule_work(&portdev->config_work); | |
1045 | } | |
1046 | /* | |
1047 | * We'll use this way of resizing only for legacy support. | |
1048 | * For newer userspace (VIRTIO_CONSOLE_F_MULTPORT+), use | |
1049 | * control messages to indicate console size changes so that | |
1050 | * it can be done per-port | |
1051 | */ | |
1052 | resize_console(find_port_by_id(portdev, 0)); | |
1053 | } | |
1054 | ||
17634ba2 AS |
1055 | static void fill_queue(struct virtqueue *vq, spinlock_t *lock) |
1056 | { | |
1057 | struct port_buffer *buf; | |
1058 | int ret; | |
1059 | ||
1060 | do { | |
1061 | buf = alloc_buf(PAGE_SIZE); | |
1062 | if (!buf) | |
1063 | break; | |
1064 | ||
1065 | spin_lock_irq(lock); | |
1066 | ret = add_inbuf(vq, buf); | |
1067 | if (ret < 0) { | |
1068 | spin_unlock_irq(lock); | |
1069 | free_buf(buf); | |
1070 | break; | |
1071 | } | |
1072 | spin_unlock_irq(lock); | |
1073 | } while (ret > 0); | |
1074 | } | |
1075 | ||
1076 | static int add_port(struct ports_device *portdev, u32 id) | |
d8a02bd5 | 1077 | { |
d99393ef | 1078 | char debugfs_name[16]; |
21206ede | 1079 | struct port *port; |
203baab8 | 1080 | struct port_buffer *inbuf; |
fb08bd27 | 1081 | dev_t devt; |
31610434 | 1082 | int err; |
31610434 | 1083 | |
1c85bf35 | 1084 | port = kmalloc(sizeof(*port), GFP_KERNEL); |
d8a02bd5 RR |
1085 | if (!port) { |
1086 | err = -ENOMEM; | |
1087 | goto fail; | |
f550804a | 1088 | } |
73954488 | 1089 | |
1c85bf35 | 1090 | port->portdev = portdev; |
17634ba2 | 1091 | port->id = id; |
203baab8 | 1092 | |
431edb8a | 1093 | port->name = NULL; |
203baab8 | 1094 | port->inbuf = NULL; |
17634ba2 | 1095 | port->cons.hvc = NULL; |
203baab8 | 1096 | |
3c7969cc | 1097 | port->host_connected = port->guest_connected = false; |
2030fa49 | 1098 | |
17634ba2 AS |
1099 | port->in_vq = portdev->in_vqs[port->id]; |
1100 | port->out_vq = portdev->out_vqs[port->id]; | |
31610434 | 1101 | |
2030fa49 | 1102 | cdev_init(&port->cdev, &port_fops); |
fb08bd27 AS |
1103 | |
1104 | devt = MKDEV(portdev->chr_major, id); | |
1105 | err = cdev_add(&port->cdev, devt, 1); | |
1106 | if (err < 0) { | |
1107 | dev_err(&port->portdev->vdev->dev, | |
1108 | "Error %d adding cdev for port %u\n", err, id); | |
1109 | goto free_port; | |
1110 | } | |
1111 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1112 | devt, port, "vport%up%u", | |
1113 | port->portdev->drv_index, id); | |
1114 | if (IS_ERR(port->dev)) { | |
1115 | err = PTR_ERR(port->dev); | |
1116 | dev_err(&port->portdev->vdev->dev, | |
1117 | "Error %d creating device for port %u\n", | |
1118 | err, id); | |
1119 | goto free_cdev; | |
1120 | } | |
1121 | ||
203baab8 | 1122 | spin_lock_init(&port->inbuf_lock); |
2030fa49 | 1123 | init_waitqueue_head(&port->waitqueue); |
203baab8 AS |
1124 | |
1125 | inbuf = alloc_buf(PAGE_SIZE); | |
1126 | if (!inbuf) { | |
1c85bf35 | 1127 | err = -ENOMEM; |
fb08bd27 | 1128 | goto free_device; |
1c85bf35 | 1129 | } |
31610434 | 1130 | |
203baab8 AS |
1131 | /* Register the input buffer the first time. */ |
1132 | add_inbuf(port->in_vq, inbuf); | |
1133 | ||
17634ba2 AS |
1134 | /* |
1135 | * If we're not using multiport support, this has to be a console port | |
1136 | */ | |
1137 | if (!use_multiport(port->portdev)) { | |
1138 | err = init_port_console(port); | |
1139 | if (err) | |
1140 | goto free_inbuf; | |
1141 | } | |
1142 | ||
1143 | spin_lock_irq(&portdev->ports_lock); | |
1144 | list_add_tail(&port->list, &port->portdev->ports); | |
1145 | spin_unlock_irq(&portdev->ports_lock); | |
1146 | ||
1147 | /* | |
1148 | * Tell the Host we're set so that it can send us various | |
1149 | * configuration parameters for this port (eg, port name, | |
1150 | * caching, whether this is a console port, etc.) | |
1151 | */ | |
1152 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
38edf58d | 1153 | |
d99393ef AS |
1154 | if (pdrvdata.debugfs_dir) { |
1155 | /* | |
1156 | * Finally, create the debugfs file that we can use to | |
1157 | * inspect a port's state at any time | |
1158 | */ | |
1159 | sprintf(debugfs_name, "vport%up%u", | |
1160 | port->portdev->drv_index, id); | |
1161 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, | |
1162 | pdrvdata.debugfs_dir, | |
1163 | port, | |
1164 | &port_debugfs_ops); | |
1165 | } | |
1c85bf35 AS |
1166 | return 0; |
1167 | ||
1168 | free_inbuf: | |
203baab8 | 1169 | free_buf(inbuf); |
fb08bd27 AS |
1170 | free_device: |
1171 | device_destroy(pdrvdata.class, port->dev->devt); | |
1172 | free_cdev: | |
1173 | cdev_del(&port->cdev); | |
1c85bf35 AS |
1174 | free_port: |
1175 | kfree(port); | |
1176 | fail: | |
1177 | return err; | |
1178 | } | |
1179 | ||
7f5d810d AS |
1180 | /* |
1181 | * The workhandler for config-space updates. | |
1182 | * | |
1183 | * This is called when ports are hot-added. | |
1184 | */ | |
1185 | static void config_work_handler(struct work_struct *work) | |
1186 | { | |
1187 | struct virtio_console_config virtconconf; | |
1188 | struct ports_device *portdev; | |
1189 | struct virtio_device *vdev; | |
1190 | int err; | |
1191 | ||
1192 | portdev = container_of(work, struct ports_device, config_work); | |
1193 | ||
1194 | vdev = portdev->vdev; | |
1195 | vdev->config->get(vdev, | |
1196 | offsetof(struct virtio_console_config, nr_ports), | |
1197 | &virtconconf.nr_ports, | |
1198 | sizeof(virtconconf.nr_ports)); | |
1199 | ||
1200 | if (portdev->config.nr_ports == virtconconf.nr_ports) { | |
1201 | /* | |
1202 | * Port 0 got hot-added. Since we already did all the | |
1203 | * other initialisation for it, just tell the Host | |
1f7aa42d AS |
1204 | * that the port is ready if we find the port. In |
1205 | * case the port was hot-removed earlier, we call | |
1206 | * add_port to add the port. | |
7f5d810d AS |
1207 | */ |
1208 | struct port *port; | |
1209 | ||
1210 | port = find_port_by_id(portdev, 0); | |
1f7aa42d AS |
1211 | if (!port) |
1212 | add_port(portdev, 0); | |
1213 | else | |
1214 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
7f5d810d AS |
1215 | return; |
1216 | } | |
1217 | if (virtconconf.nr_ports > portdev->config.max_nr_ports) { | |
1218 | dev_warn(&vdev->dev, | |
1219 | "More ports specified (%u) than allowed (%u)", | |
1220 | portdev->config.nr_ports + 1, | |
1221 | portdev->config.max_nr_ports); | |
1222 | return; | |
1223 | } | |
1224 | if (virtconconf.nr_ports < portdev->config.nr_ports) | |
1225 | return; | |
1226 | ||
1227 | /* Hot-add ports */ | |
1228 | while (virtconconf.nr_ports - portdev->config.nr_ports) { | |
1229 | err = add_port(portdev, portdev->config.nr_ports); | |
1230 | if (err) | |
1231 | break; | |
1232 | portdev->config.nr_ports++; | |
1233 | } | |
1234 | } | |
1235 | ||
2658a79a AS |
1236 | static int init_vqs(struct ports_device *portdev) |
1237 | { | |
1238 | vq_callback_t **io_callbacks; | |
1239 | char **io_names; | |
1240 | struct virtqueue **vqs; | |
17634ba2 | 1241 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1242 | int err; |
1243 | ||
17634ba2 AS |
1244 | nr_ports = portdev->config.max_nr_ports; |
1245 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1246 | |
1247 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
1248 | if (!vqs) { | |
1249 | err = -ENOMEM; | |
1250 | goto fail; | |
1251 | } | |
1252 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); | |
1253 | if (!io_callbacks) { | |
1254 | err = -ENOMEM; | |
1255 | goto free_vqs; | |
1256 | } | |
1257 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); | |
1258 | if (!io_names) { | |
1259 | err = -ENOMEM; | |
1260 | goto free_callbacks; | |
1261 | } | |
1262 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1263 | GFP_KERNEL); | |
1264 | if (!portdev->in_vqs) { | |
1265 | err = -ENOMEM; | |
1266 | goto free_names; | |
1267 | } | |
1268 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1269 | GFP_KERNEL); | |
1270 | if (!portdev->out_vqs) { | |
1271 | err = -ENOMEM; | |
1272 | goto free_invqs; | |
1273 | } | |
1274 | ||
17634ba2 AS |
1275 | /* |
1276 | * For backward compat (newer host but older guest), the host | |
1277 | * spawns a console port first and also inits the vqs for port | |
1278 | * 0 before others. | |
1279 | */ | |
1280 | j = 0; | |
1281 | io_callbacks[j] = in_intr; | |
1282 | io_callbacks[j + 1] = NULL; | |
1283 | io_names[j] = "input"; | |
1284 | io_names[j + 1] = "output"; | |
1285 | j += 2; | |
1286 | ||
1287 | if (use_multiport(portdev)) { | |
1288 | io_callbacks[j] = control_intr; | |
1289 | io_callbacks[j + 1] = NULL; | |
1290 | io_names[j] = "control-i"; | |
1291 | io_names[j + 1] = "control-o"; | |
1292 | ||
1293 | for (i = 1; i < nr_ports; i++) { | |
1294 | j += 2; | |
1295 | io_callbacks[j] = in_intr; | |
1296 | io_callbacks[j + 1] = NULL; | |
1297 | io_names[j] = "input"; | |
1298 | io_names[j + 1] = "output"; | |
1299 | } | |
1300 | } | |
2658a79a AS |
1301 | /* Find the queues. */ |
1302 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1303 | io_callbacks, | |
1304 | (const char **)io_names); | |
1305 | if (err) | |
1306 | goto free_outvqs; | |
1307 | ||
17634ba2 | 1308 | j = 0; |
2658a79a AS |
1309 | portdev->in_vqs[0] = vqs[0]; |
1310 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1311 | j += 2; |
1312 | if (use_multiport(portdev)) { | |
1313 | portdev->c_ivq = vqs[j]; | |
1314 | portdev->c_ovq = vqs[j + 1]; | |
1315 | ||
1316 | for (i = 1; i < nr_ports; i++) { | |
1317 | j += 2; | |
1318 | portdev->in_vqs[i] = vqs[j]; | |
1319 | portdev->out_vqs[i] = vqs[j + 1]; | |
1320 | } | |
1321 | } | |
2658a79a AS |
1322 | kfree(io_callbacks); |
1323 | kfree(io_names); | |
1324 | kfree(vqs); | |
1325 | ||
1326 | return 0; | |
1327 | ||
1328 | free_names: | |
1329 | kfree(io_names); | |
1330 | free_callbacks: | |
1331 | kfree(io_callbacks); | |
1332 | free_outvqs: | |
1333 | kfree(portdev->out_vqs); | |
1334 | free_invqs: | |
1335 | kfree(portdev->in_vqs); | |
1336 | free_vqs: | |
1337 | kfree(vqs); | |
1338 | fail: | |
1339 | return err; | |
1340 | } | |
1341 | ||
fb08bd27 AS |
1342 | static const struct file_operations portdev_fops = { |
1343 | .owner = THIS_MODULE, | |
1344 | }; | |
1345 | ||
1c85bf35 AS |
1346 | /* |
1347 | * Once we're further in boot, we get probed like any other virtio | |
1348 | * device. | |
17634ba2 AS |
1349 | * |
1350 | * If the host also supports multiple console ports, we check the | |
1351 | * config space to see how many ports the host has spawned. We | |
1352 | * initialize each port found. | |
1c85bf35 AS |
1353 | */ |
1354 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1355 | { | |
1c85bf35 | 1356 | struct ports_device *portdev; |
17634ba2 | 1357 | u32 i; |
1c85bf35 | 1358 | int err; |
17634ba2 | 1359 | bool multiport; |
1c85bf35 AS |
1360 | |
1361 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1362 | if (!portdev) { | |
1363 | err = -ENOMEM; | |
1364 | goto fail; | |
1365 | } | |
1366 | ||
1367 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1368 | portdev->vdev = vdev; | |
1369 | vdev->priv = portdev; | |
1370 | ||
fb08bd27 AS |
1371 | spin_lock_irq(&pdrvdata_lock); |
1372 | portdev->drv_index = pdrvdata.index++; | |
1373 | spin_unlock_irq(&pdrvdata_lock); | |
1374 | ||
1375 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1376 | &portdev_fops); | |
1377 | if (portdev->chr_major < 0) { | |
1378 | dev_err(&vdev->dev, | |
1379 | "Error %d registering chrdev for device %u\n", | |
1380 | portdev->chr_major, portdev->drv_index); | |
1381 | err = portdev->chr_major; | |
1382 | goto free; | |
1383 | } | |
1384 | ||
17634ba2 AS |
1385 | multiport = false; |
1386 | portdev->config.nr_ports = 1; | |
1387 | portdev->config.max_nr_ports = 1; | |
1388 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { | |
1389 | multiport = true; | |
1390 | vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; | |
1391 | ||
1392 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1393 | nr_ports), | |
1394 | &portdev->config.nr_ports, | |
1395 | sizeof(portdev->config.nr_ports)); | |
1396 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1397 | max_nr_ports), | |
1398 | &portdev->config.max_nr_ports, | |
1399 | sizeof(portdev->config.max_nr_ports)); | |
1400 | if (portdev->config.nr_ports > portdev->config.max_nr_ports) { | |
1401 | dev_warn(&vdev->dev, | |
1402 | "More ports (%u) specified than allowed (%u). Will init %u ports.", | |
1403 | portdev->config.nr_ports, | |
1404 | portdev->config.max_nr_ports, | |
1405 | portdev->config.max_nr_ports); | |
1406 | ||
1407 | portdev->config.nr_ports = portdev->config.max_nr_ports; | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | /* Let the Host know we support multiple ports.*/ | |
1412 | vdev->config->finalize_features(vdev); | |
1413 | ||
2658a79a AS |
1414 | err = init_vqs(portdev); |
1415 | if (err < 0) { | |
1416 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1417 | goto free_chrdev; |
2658a79a | 1418 | } |
1c85bf35 | 1419 | |
17634ba2 AS |
1420 | spin_lock_init(&portdev->ports_lock); |
1421 | INIT_LIST_HEAD(&portdev->ports); | |
1422 | ||
1423 | if (multiport) { | |
1424 | spin_lock_init(&portdev->cvq_lock); | |
1425 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
7f5d810d | 1426 | INIT_WORK(&portdev->config_work, &config_work_handler); |
17634ba2 AS |
1427 | |
1428 | fill_queue(portdev->c_ivq, &portdev->cvq_lock); | |
1429 | } | |
1430 | ||
1431 | for (i = 0; i < portdev->config.nr_ports; i++) | |
1432 | add_port(portdev, i); | |
1c85bf35 | 1433 | |
971f3390 RR |
1434 | /* Start using the new console output. */ |
1435 | early_put_chars = NULL; | |
31610434 RR |
1436 | return 0; |
1437 | ||
fb08bd27 AS |
1438 | free_chrdev: |
1439 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1440 | free: |
1c85bf35 | 1441 | kfree(portdev); |
31610434 RR |
1442 | fail: |
1443 | return err; | |
1444 | } | |
1445 | ||
1446 | static struct virtio_device_id id_table[] = { | |
1447 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1448 | { 0 }, | |
1449 | }; | |
1450 | ||
c2983458 CB |
1451 | static unsigned int features[] = { |
1452 | VIRTIO_CONSOLE_F_SIZE, | |
17634ba2 | 1453 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1454 | }; |
1455 | ||
31610434 | 1456 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1457 | .feature_table = features, |
1458 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1459 | .driver.name = KBUILD_MODNAME, |
1460 | .driver.owner = THIS_MODULE, | |
1461 | .id_table = id_table, | |
1462 | .probe = virtcons_probe, | |
7f5d810d | 1463 | .config_changed = config_intr, |
31610434 RR |
1464 | }; |
1465 | ||
1466 | static int __init init(void) | |
1467 | { | |
fb08bd27 AS |
1468 | int err; |
1469 | ||
1470 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
1471 | if (IS_ERR(pdrvdata.class)) { | |
1472 | err = PTR_ERR(pdrvdata.class); | |
1473 | pr_err("Error %d creating virtio-ports class\n", err); | |
1474 | return err; | |
1475 | } | |
d99393ef AS |
1476 | |
1477 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
1478 | if (!pdrvdata.debugfs_dir) { | |
1479 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
1480 | PTR_ERR(pdrvdata.debugfs_dir)); | |
1481 | } | |
38edf58d AS |
1482 | INIT_LIST_HEAD(&pdrvdata.consoles); |
1483 | ||
31610434 RR |
1484 | return register_virtio_driver(&virtio_console); |
1485 | } | |
1486 | module_init(init); | |
1487 | ||
1488 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1489 | MODULE_DESCRIPTION("Virtio console driver"); | |
1490 | MODULE_LICENSE("GPL"); |