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 | 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> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
38edf58d | 29 | #include <linux/spinlock.h> |
31610434 RR |
30 | #include <linux/virtio.h> |
31 | #include <linux/virtio_console.h> | |
2030fa49 | 32 | #include <linux/wait.h> |
17634ba2 | 33 | #include <linux/workqueue.h> |
31610434 RR |
34 | #include "hvc_console.h" |
35 | ||
38edf58d AS |
36 | /* |
37 | * This is a global struct for storing common data for all the devices | |
38 | * this driver handles. | |
39 | * | |
40 | * Mainly, it has a linked list for all the consoles in one place so | |
41 | * that callbacks from hvc for get_chars(), put_chars() work properly | |
42 | * across multiple devices and multiple ports per device. | |
43 | */ | |
44 | struct ports_driver_data { | |
fb08bd27 AS |
45 | /* Used for registering chardevs */ |
46 | struct class *class; | |
47 | ||
d99393ef AS |
48 | /* Used for exporting per-port information to debugfs */ |
49 | struct dentry *debugfs_dir; | |
50 | ||
fb08bd27 AS |
51 | /* Number of devices this driver is handling */ |
52 | unsigned int index; | |
53 | ||
d8a02bd5 RR |
54 | /* |
55 | * This is used to keep track of the number of hvc consoles | |
56 | * spawned by this driver. This number is given as the first | |
57 | * argument to hvc_alloc(). To correctly map an initial | |
58 | * console spawned via hvc_instantiate to the console being | |
59 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
60 | * | |
61 | * We also just assume the first console being initialised was | |
62 | * the first one that got used as the initial console. | |
63 | */ | |
64 | unsigned int next_vtermno; | |
65 | ||
38edf58d AS |
66 | /* All the console devices handled by this driver */ |
67 | struct list_head consoles; | |
68 | }; | |
69 | static struct ports_driver_data pdrvdata; | |
70 | ||
71 | DEFINE_SPINLOCK(pdrvdata_lock); | |
72 | ||
4f23c573 AS |
73 | /* This struct holds information that's relevant only for console ports */ |
74 | struct console { | |
75 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
76 | struct list_head list; | |
77 | ||
78 | /* The hvc device associated with this console port */ | |
79 | struct hvc_struct *hvc; | |
80 | ||
81 | /* | |
82 | * This number identifies the number that we used to register | |
83 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
84 | * number passed on by the hvc callbacks to us to | |
85 | * differentiate between the other console ports handled by | |
86 | * this driver | |
87 | */ | |
88 | u32 vtermno; | |
89 | }; | |
90 | ||
fdb9a054 AS |
91 | struct port_buffer { |
92 | char *buf; | |
93 | ||
94 | /* size of the buffer in *buf above */ | |
95 | size_t size; | |
96 | ||
97 | /* used length of the buffer */ | |
98 | size_t len; | |
99 | /* offset in the buf from which to consume data */ | |
100 | size_t offset; | |
101 | }; | |
102 | ||
17634ba2 AS |
103 | /* |
104 | * This is a per-device struct that stores data common to all the | |
105 | * ports for that device (vdev->priv). | |
106 | */ | |
107 | struct ports_device { | |
108 | /* | |
109 | * Workqueue handlers where we process deferred work after | |
110 | * notification | |
111 | */ | |
112 | struct work_struct control_work; | |
7f5d810d | 113 | struct work_struct config_work; |
17634ba2 AS |
114 | |
115 | struct list_head ports; | |
116 | ||
117 | /* To protect the list of ports */ | |
118 | spinlock_t ports_lock; | |
119 | ||
120 | /* To protect the vq operations for the control channel */ | |
121 | spinlock_t cvq_lock; | |
122 | ||
123 | /* The current config space is stored here */ | |
124 | struct virtio_console_config config; | |
125 | ||
126 | /* The virtio device we're associated with */ | |
127 | struct virtio_device *vdev; | |
128 | ||
129 | /* | |
130 | * A couple of virtqueues for the control channel: one for | |
131 | * guest->host transfers, one for host->guest transfers | |
132 | */ | |
133 | struct virtqueue *c_ivq, *c_ovq; | |
134 | ||
135 | /* Array of per-port IO virtqueues */ | |
136 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
137 | |
138 | /* Used for numbering devices for sysfs and debugfs */ | |
139 | unsigned int drv_index; | |
140 | ||
141 | /* Major number for this device. Ports will be created as minors. */ | |
142 | int chr_major; | |
17634ba2 AS |
143 | }; |
144 | ||
1c85bf35 | 145 | /* This struct holds the per-port data */ |
21206ede | 146 | struct port { |
17634ba2 AS |
147 | /* Next port in the list, head is in the ports_device */ |
148 | struct list_head list; | |
149 | ||
1c85bf35 AS |
150 | /* Pointer to the parent virtio_console device */ |
151 | struct ports_device *portdev; | |
fdb9a054 AS |
152 | |
153 | /* The current buffer from which data has to be fed to readers */ | |
154 | struct port_buffer *inbuf; | |
21206ede | 155 | |
203baab8 AS |
156 | /* |
157 | * To protect the operations on the in_vq associated with this | |
158 | * port. Has to be a spinlock because it can be called from | |
159 | * interrupt context (get_char()). | |
160 | */ | |
161 | spinlock_t inbuf_lock; | |
162 | ||
1c85bf35 AS |
163 | /* The IO vqs for this port */ |
164 | struct virtqueue *in_vq, *out_vq; | |
165 | ||
d99393ef AS |
166 | /* File in the debugfs directory that exposes this port's information */ |
167 | struct dentry *debugfs_file; | |
168 | ||
4f23c573 AS |
169 | /* |
170 | * The entries in this struct will be valid if this port is | |
171 | * hooked up to an hvc console | |
172 | */ | |
173 | struct console cons; | |
17634ba2 | 174 | |
fb08bd27 AS |
175 | /* Each port associates with a separate char device */ |
176 | struct cdev cdev; | |
177 | struct device *dev; | |
178 | ||
2030fa49 AS |
179 | /* A waitqueue for poll() or blocking read operations */ |
180 | wait_queue_head_t waitqueue; | |
181 | ||
431edb8a AS |
182 | /* The 'name' of the port that we expose via sysfs properties */ |
183 | char *name; | |
184 | ||
17634ba2 AS |
185 | /* The 'id' to identify the port with the Host */ |
186 | u32 id; | |
2030fa49 AS |
187 | |
188 | /* Is the host device open */ | |
189 | bool host_connected; | |
3c7969cc AS |
190 | |
191 | /* We should allow only one process to open a port */ | |
192 | bool guest_connected; | |
21206ede | 193 | }; |
31610434 | 194 | |
971f3390 RR |
195 | /* This is the very early arch-specified put chars function. */ |
196 | static int (*early_put_chars)(u32, const char *, int); | |
197 | ||
38edf58d AS |
198 | static struct port *find_port_by_vtermno(u32 vtermno) |
199 | { | |
200 | struct port *port; | |
4f23c573 | 201 | struct console *cons; |
38edf58d AS |
202 | unsigned long flags; |
203 | ||
204 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
205 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
206 | if (cons->vtermno == vtermno) { | |
207 | port = container_of(cons, struct port, cons); | |
38edf58d | 208 | goto out; |
4f23c573 | 209 | } |
38edf58d AS |
210 | } |
211 | port = NULL; | |
212 | out: | |
213 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
214 | return port; | |
215 | } | |
216 | ||
17634ba2 AS |
217 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
218 | { | |
219 | struct port *port; | |
220 | unsigned long flags; | |
221 | ||
222 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
223 | list_for_each_entry(port, &portdev->ports, list) | |
224 | if (port->id == id) | |
225 | goto out; | |
226 | port = NULL; | |
227 | out: | |
228 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
229 | ||
230 | return port; | |
231 | } | |
232 | ||
203baab8 AS |
233 | static struct port *find_port_by_vq(struct ports_device *portdev, |
234 | struct virtqueue *vq) | |
235 | { | |
236 | struct port *port; | |
203baab8 AS |
237 | unsigned long flags; |
238 | ||
17634ba2 AS |
239 | spin_lock_irqsave(&portdev->ports_lock, flags); |
240 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
241 | if (port->in_vq == vq || port->out_vq == vq) |
242 | goto out; | |
203baab8 AS |
243 | port = NULL; |
244 | out: | |
17634ba2 | 245 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
246 | return port; |
247 | } | |
248 | ||
17634ba2 AS |
249 | static bool is_console_port(struct port *port) |
250 | { | |
251 | if (port->cons.hvc) | |
252 | return true; | |
253 | return false; | |
254 | } | |
255 | ||
256 | static inline bool use_multiport(struct ports_device *portdev) | |
257 | { | |
258 | /* | |
259 | * This condition can be true when put_chars is called from | |
260 | * early_init | |
261 | */ | |
262 | if (!portdev->vdev) | |
263 | return 0; | |
264 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
265 | } | |
266 | ||
fdb9a054 AS |
267 | static void free_buf(struct port_buffer *buf) |
268 | { | |
269 | kfree(buf->buf); | |
270 | kfree(buf); | |
271 | } | |
272 | ||
273 | static struct port_buffer *alloc_buf(size_t buf_size) | |
274 | { | |
275 | struct port_buffer *buf; | |
276 | ||
277 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
278 | if (!buf) | |
279 | goto fail; | |
280 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
281 | if (!buf->buf) | |
282 | goto free_buf; | |
283 | buf->len = 0; | |
284 | buf->offset = 0; | |
285 | buf->size = buf_size; | |
286 | return buf; | |
287 | ||
288 | free_buf: | |
289 | kfree(buf); | |
290 | fail: | |
291 | return NULL; | |
292 | } | |
293 | ||
a3cde449 AS |
294 | /* Callers should take appropriate locks */ |
295 | static void *get_inbuf(struct port *port) | |
296 | { | |
297 | struct port_buffer *buf; | |
298 | struct virtqueue *vq; | |
299 | unsigned int len; | |
300 | ||
301 | vq = port->in_vq; | |
302 | buf = vq->vq_ops->get_buf(vq, &len); | |
303 | if (buf) { | |
304 | buf->len = len; | |
305 | buf->offset = 0; | |
306 | } | |
307 | return buf; | |
308 | } | |
309 | ||
e27b5198 AS |
310 | /* |
311 | * Create a scatter-gather list representing our input buffer and put | |
312 | * it in the queue. | |
313 | * | |
314 | * Callers should take appropriate locks. | |
315 | */ | |
203baab8 | 316 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
317 | { |
318 | struct scatterlist sg[1]; | |
203baab8 | 319 | int ret; |
1c85bf35 | 320 | |
e27b5198 AS |
321 | sg_init_one(sg, buf->buf, buf->size); |
322 | ||
203baab8 | 323 | ret = vq->vq_ops->add_buf(vq, sg, 0, 1, buf); |
e27b5198 | 324 | vq->vq_ops->kick(vq); |
203baab8 AS |
325 | return ret; |
326 | } | |
327 | ||
88f251ac AS |
328 | /* Discard any unread data this port has. Callers lockers. */ |
329 | static void discard_port_data(struct port *port) | |
330 | { | |
331 | struct port_buffer *buf; | |
332 | struct virtqueue *vq; | |
333 | unsigned int len; | |
d6933561 | 334 | int ret; |
88f251ac AS |
335 | |
336 | vq = port->in_vq; | |
337 | if (port->inbuf) | |
338 | buf = port->inbuf; | |
339 | else | |
340 | buf = vq->vq_ops->get_buf(vq, &len); | |
341 | ||
d6933561 AS |
342 | ret = 0; |
343 | while (buf) { | |
344 | if (add_inbuf(vq, buf) < 0) { | |
345 | ret++; | |
346 | free_buf(buf); | |
347 | } | |
348 | buf = vq->vq_ops->get_buf(vq, &len); | |
88f251ac | 349 | } |
88f251ac | 350 | port->inbuf = NULL; |
d6933561 AS |
351 | if (ret) |
352 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", | |
353 | ret); | |
88f251ac AS |
354 | } |
355 | ||
203baab8 AS |
356 | static bool port_has_data(struct port *port) |
357 | { | |
358 | unsigned long flags; | |
359 | bool ret; | |
360 | ||
203baab8 | 361 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 362 | if (port->inbuf) { |
203baab8 | 363 | ret = true; |
d6933561 AS |
364 | goto out; |
365 | } | |
366 | port->inbuf = get_inbuf(port); | |
367 | if (port->inbuf) { | |
368 | ret = true; | |
369 | goto out; | |
370 | } | |
371 | ret = false; | |
372 | out: | |
203baab8 | 373 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
374 | return ret; |
375 | } | |
376 | ||
17634ba2 AS |
377 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
378 | unsigned int value) | |
379 | { | |
380 | struct scatterlist sg[1]; | |
381 | struct virtio_console_control cpkt; | |
382 | struct virtqueue *vq; | |
604b2ad7 | 383 | unsigned int len; |
17634ba2 AS |
384 | |
385 | if (!use_multiport(port->portdev)) | |
386 | return 0; | |
387 | ||
388 | cpkt.id = port->id; | |
389 | cpkt.event = event; | |
390 | cpkt.value = value; | |
391 | ||
392 | vq = port->portdev->c_ovq; | |
393 | ||
394 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
395 | if (vq->vq_ops->add_buf(vq, sg, 1, 0, &cpkt) >= 0) { | |
396 | vq->vq_ops->kick(vq); | |
397 | while (!vq->vq_ops->get_buf(vq, &len)) | |
398 | cpu_relax(); | |
399 | } | |
400 | return 0; | |
401 | } | |
402 | ||
f997f00b AS |
403 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count) |
404 | { | |
405 | struct scatterlist sg[1]; | |
406 | struct virtqueue *out_vq; | |
407 | ssize_t ret; | |
408 | unsigned int len; | |
409 | ||
410 | out_vq = port->out_vq; | |
411 | ||
412 | sg_init_one(sg, in_buf, in_count); | |
413 | ret = out_vq->vq_ops->add_buf(out_vq, sg, 1, 0, in_buf); | |
414 | ||
415 | /* Tell Host to go! */ | |
416 | out_vq->vq_ops->kick(out_vq); | |
417 | ||
418 | if (ret < 0) { | |
419 | len = 0; | |
420 | goto fail; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Wait till the host acknowledges it pushed out the data we | |
425 | * sent. Also ensure we return to userspace the number of | |
426 | * bytes that were successfully consumed by the host. | |
427 | */ | |
428 | while (!out_vq->vq_ops->get_buf(out_vq, &len)) | |
429 | cpu_relax(); | |
430 | fail: | |
431 | /* We're expected to return the amount of data we wrote */ | |
432 | return len; | |
433 | } | |
434 | ||
203baab8 AS |
435 | /* |
436 | * Give out the data that's requested from the buffer that we have | |
437 | * queued up. | |
438 | */ | |
b766ceed AS |
439 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
440 | bool to_user) | |
203baab8 AS |
441 | { |
442 | struct port_buffer *buf; | |
443 | unsigned long flags; | |
444 | ||
445 | if (!out_count || !port_has_data(port)) | |
446 | return 0; | |
447 | ||
448 | buf = port->inbuf; | |
b766ceed | 449 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 450 | |
b766ceed AS |
451 | if (to_user) { |
452 | ssize_t ret; | |
453 | ||
454 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
455 | if (ret) | |
456 | return -EFAULT; | |
457 | } else { | |
458 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
459 | } | |
203baab8 | 460 | |
203baab8 AS |
461 | buf->offset += out_count; |
462 | ||
463 | if (buf->offset == buf->len) { | |
464 | /* | |
465 | * We're done using all the data in this buffer. | |
466 | * Re-queue so that the Host can send us more data. | |
467 | */ | |
468 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
469 | port->inbuf = NULL; | |
470 | ||
471 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 472 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
473 | |
474 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
475 | } | |
b766ceed | 476 | /* Return the number of bytes actually copied */ |
203baab8 | 477 | return out_count; |
e27b5198 AS |
478 | } |
479 | ||
2030fa49 AS |
480 | /* The condition that must be true for polling to end */ |
481 | static bool wait_is_over(struct port *port) | |
482 | { | |
483 | return port_has_data(port) || !port->host_connected; | |
484 | } | |
485 | ||
486 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, | |
487 | size_t count, loff_t *offp) | |
488 | { | |
489 | struct port *port; | |
490 | ssize_t ret; | |
491 | ||
492 | port = filp->private_data; | |
493 | ||
494 | if (!port_has_data(port)) { | |
495 | /* | |
496 | * If nothing's connected on the host just return 0 in | |
497 | * case of list_empty; this tells the userspace app | |
498 | * that there's no connection | |
499 | */ | |
500 | if (!port->host_connected) | |
501 | return 0; | |
502 | if (filp->f_flags & O_NONBLOCK) | |
503 | return -EAGAIN; | |
504 | ||
505 | ret = wait_event_interruptible(port->waitqueue, | |
506 | wait_is_over(port)); | |
507 | if (ret < 0) | |
508 | return ret; | |
509 | } | |
510 | /* | |
511 | * We could've received a disconnection message while we were | |
512 | * waiting for more data. | |
513 | * | |
514 | * This check is not clubbed in the if() statement above as we | |
515 | * might receive some data as well as the host could get | |
516 | * disconnected after we got woken up from our wait. So we | |
517 | * really want to give off whatever data we have and only then | |
518 | * check for host_connected. | |
519 | */ | |
520 | if (!port_has_data(port) && !port->host_connected) | |
521 | return 0; | |
522 | ||
523 | return fill_readbuf(port, ubuf, count, true); | |
524 | } | |
525 | ||
526 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
527 | size_t count, loff_t *offp) | |
528 | { | |
529 | struct port *port; | |
530 | char *buf; | |
531 | ssize_t ret; | |
532 | ||
533 | port = filp->private_data; | |
534 | ||
535 | count = min((size_t)(32 * 1024), count); | |
536 | ||
537 | buf = kmalloc(count, GFP_KERNEL); | |
538 | if (!buf) | |
539 | return -ENOMEM; | |
540 | ||
541 | ret = copy_from_user(buf, ubuf, count); | |
542 | if (ret) { | |
543 | ret = -EFAULT; | |
544 | goto free_buf; | |
545 | } | |
546 | ||
547 | ret = send_buf(port, buf, count); | |
548 | free_buf: | |
549 | kfree(buf); | |
550 | return ret; | |
551 | } | |
552 | ||
553 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
554 | { | |
555 | struct port *port; | |
556 | unsigned int ret; | |
557 | ||
558 | port = filp->private_data; | |
559 | poll_wait(filp, &port->waitqueue, wait); | |
560 | ||
561 | ret = 0; | |
562 | if (port->inbuf) | |
563 | ret |= POLLIN | POLLRDNORM; | |
564 | if (port->host_connected) | |
565 | ret |= POLLOUT; | |
566 | if (!port->host_connected) | |
567 | ret |= POLLHUP; | |
568 | ||
569 | return ret; | |
570 | } | |
571 | ||
572 | static int port_fops_release(struct inode *inode, struct file *filp) | |
573 | { | |
574 | struct port *port; | |
575 | ||
576 | port = filp->private_data; | |
577 | ||
578 | /* Notify host of port being closed */ | |
579 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
580 | ||
88f251ac | 581 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
582 | port->guest_connected = false; |
583 | ||
88f251ac AS |
584 | discard_port_data(port); |
585 | ||
586 | spin_unlock_irq(&port->inbuf_lock); | |
587 | ||
2030fa49 AS |
588 | return 0; |
589 | } | |
590 | ||
591 | static int port_fops_open(struct inode *inode, struct file *filp) | |
592 | { | |
593 | struct cdev *cdev = inode->i_cdev; | |
594 | struct port *port; | |
595 | ||
596 | port = container_of(cdev, struct port, cdev); | |
597 | filp->private_data = port; | |
598 | ||
599 | /* | |
600 | * Don't allow opening of console port devices -- that's done | |
601 | * via /dev/hvc | |
602 | */ | |
603 | if (is_console_port(port)) | |
604 | return -ENXIO; | |
605 | ||
3c7969cc AS |
606 | /* Allow only one process to open a particular port at a time */ |
607 | spin_lock_irq(&port->inbuf_lock); | |
608 | if (port->guest_connected) { | |
609 | spin_unlock_irq(&port->inbuf_lock); | |
610 | return -EMFILE; | |
611 | } | |
612 | ||
613 | port->guest_connected = true; | |
614 | spin_unlock_irq(&port->inbuf_lock); | |
615 | ||
2030fa49 AS |
616 | /* Notify host of port being opened */ |
617 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | /* | |
623 | * The file operations that we support: programs in the guest can open | |
624 | * a console device, read from it, write to it, poll for data and | |
625 | * close it. The devices are at | |
626 | * /dev/vport<device number>p<port number> | |
627 | */ | |
628 | static const struct file_operations port_fops = { | |
629 | .owner = THIS_MODULE, | |
630 | .open = port_fops_open, | |
631 | .read = port_fops_read, | |
632 | .write = port_fops_write, | |
633 | .poll = port_fops_poll, | |
634 | .release = port_fops_release, | |
635 | }; | |
636 | ||
a23ea924 RR |
637 | /* |
638 | * The put_chars() callback is pretty straightforward. | |
31610434 | 639 | * |
a23ea924 RR |
640 | * We turn the characters into a scatter-gather list, add it to the |
641 | * output queue and then kick the Host. Then we sit here waiting for | |
642 | * it to finish: inefficient in theory, but in practice | |
643 | * implementations will do it immediately (lguest's Launcher does). | |
644 | */ | |
31610434 RR |
645 | static int put_chars(u32 vtermno, const char *buf, int count) |
646 | { | |
21206ede | 647 | struct port *port; |
38edf58d AS |
648 | |
649 | port = find_port_by_vtermno(vtermno); | |
650 | if (!port) | |
651 | return 0; | |
31610434 | 652 | |
971f3390 RR |
653 | if (unlikely(early_put_chars)) |
654 | return early_put_chars(vtermno, buf, count); | |
655 | ||
f997f00b | 656 | return send_buf(port, (void *)buf, count); |
31610434 RR |
657 | } |
658 | ||
a23ea924 RR |
659 | /* |
660 | * get_chars() is the callback from the hvc_console infrastructure | |
661 | * when an interrupt is received. | |
31610434 | 662 | * |
203baab8 AS |
663 | * We call out to fill_readbuf that gets us the required data from the |
664 | * buffers that are queued up. | |
a23ea924 | 665 | */ |
31610434 RR |
666 | static int get_chars(u32 vtermno, char *buf, int count) |
667 | { | |
21206ede RR |
668 | struct port *port; |
669 | ||
38edf58d AS |
670 | port = find_port_by_vtermno(vtermno); |
671 | if (!port) | |
672 | return 0; | |
21206ede | 673 | |
31610434 | 674 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 675 | BUG_ON(!port->in_vq); |
31610434 | 676 | |
b766ceed | 677 | return fill_readbuf(port, buf, count, false); |
31610434 | 678 | } |
31610434 | 679 | |
cb06e367 | 680 | static void resize_console(struct port *port) |
c2983458 | 681 | { |
cb06e367 | 682 | struct virtio_device *vdev; |
c2983458 CB |
683 | struct winsize ws; |
684 | ||
2de16a49 AS |
685 | /* The port could have been hot-unplugged */ |
686 | if (!port) | |
687 | return; | |
688 | ||
cb06e367 AS |
689 | vdev = port->portdev->vdev; |
690 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) { | |
691 | vdev->config->get(vdev, | |
692 | offsetof(struct virtio_console_config, cols), | |
693 | &ws.ws_col, sizeof(u16)); | |
694 | vdev->config->get(vdev, | |
695 | offsetof(struct virtio_console_config, rows), | |
696 | &ws.ws_row, sizeof(u16)); | |
4f23c573 | 697 | hvc_resize(port->cons.hvc, ws); |
c2983458 CB |
698 | } |
699 | } | |
700 | ||
38edf58d | 701 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
702 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
703 | { | |
38edf58d AS |
704 | struct port *port; |
705 | ||
706 | port = find_port_by_vtermno(hp->vtermno); | |
707 | if (!port) | |
708 | return -EINVAL; | |
709 | ||
91fcad19 | 710 | hp->irq_requested = 1; |
cb06e367 | 711 | resize_console(port); |
c2983458 | 712 | |
91fcad19 CB |
713 | return 0; |
714 | } | |
715 | ||
716 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
717 | { | |
718 | hp->irq_requested = 0; | |
719 | } | |
720 | ||
17634ba2 | 721 | /* The operations for console ports. */ |
1dff3996 | 722 | static const struct hv_ops hv_ops = { |
971f3390 RR |
723 | .get_chars = get_chars, |
724 | .put_chars = put_chars, | |
725 | .notifier_add = notifier_add_vio, | |
726 | .notifier_del = notifier_del_vio, | |
727 | .notifier_hangup = notifier_del_vio, | |
728 | }; | |
729 | ||
730 | /* | |
731 | * Console drivers are initialized very early so boot messages can go | |
732 | * out, so we do things slightly differently from the generic virtio | |
733 | * initialization of the net and block drivers. | |
734 | * | |
735 | * At this stage, the console is output-only. It's too early to set | |
736 | * up a virtqueue, so we let the drivers do some boutique early-output | |
737 | * thing. | |
738 | */ | |
739 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
740 | { | |
741 | early_put_chars = put_chars; | |
742 | return hvc_instantiate(0, 0, &hv_ops); | |
743 | } | |
744 | ||
17634ba2 | 745 | int init_port_console(struct port *port) |
cfa6d379 AS |
746 | { |
747 | int ret; | |
748 | ||
749 | /* | |
750 | * The Host's telling us this port is a console port. Hook it | |
751 | * up with an hvc console. | |
752 | * | |
753 | * To set up and manage our virtual console, we call | |
754 | * hvc_alloc(). | |
755 | * | |
756 | * The first argument of hvc_alloc() is the virtual console | |
757 | * number. The second argument is the parameter for the | |
758 | * notification mechanism (like irq number). We currently | |
759 | * leave this as zero, virtqueues have implicit notifications. | |
760 | * | |
761 | * The third argument is a "struct hv_ops" containing the | |
762 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
763 | * pointers. The final argument is the output buffer size: we | |
764 | * can do any size, so we put PAGE_SIZE here. | |
765 | */ | |
766 | port->cons.vtermno = pdrvdata.next_vtermno; | |
767 | ||
768 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
769 | if (IS_ERR(port->cons.hvc)) { | |
770 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
771 | dev_err(port->dev, |
772 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
773 | port->cons.hvc = NULL; |
774 | return ret; | |
775 | } | |
776 | spin_lock_irq(&pdrvdata_lock); | |
777 | pdrvdata.next_vtermno++; | |
778 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
779 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 780 | port->guest_connected = true; |
cfa6d379 | 781 | |
2030fa49 AS |
782 | /* Notify host of port being opened */ |
783 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
784 | ||
cfa6d379 AS |
785 | return 0; |
786 | } | |
787 | ||
431edb8a AS |
788 | static ssize_t show_port_name(struct device *dev, |
789 | struct device_attribute *attr, char *buffer) | |
790 | { | |
791 | struct port *port; | |
792 | ||
793 | port = dev_get_drvdata(dev); | |
794 | ||
795 | return sprintf(buffer, "%s\n", port->name); | |
796 | } | |
797 | ||
798 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
799 | ||
800 | static struct attribute *port_sysfs_entries[] = { | |
801 | &dev_attr_name.attr, | |
802 | NULL | |
803 | }; | |
804 | ||
805 | static struct attribute_group port_attribute_group = { | |
806 | .name = NULL, /* put in device directory */ | |
807 | .attrs = port_sysfs_entries, | |
808 | }; | |
809 | ||
d99393ef AS |
810 | static int debugfs_open(struct inode *inode, struct file *filp) |
811 | { | |
812 | filp->private_data = inode->i_private; | |
813 | return 0; | |
814 | } | |
815 | ||
816 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, | |
817 | size_t count, loff_t *offp) | |
818 | { | |
819 | struct port *port; | |
820 | char *buf; | |
821 | ssize_t ret, out_offset, out_count; | |
822 | ||
823 | out_count = 1024; | |
824 | buf = kmalloc(out_count, GFP_KERNEL); | |
825 | if (!buf) | |
826 | return -ENOMEM; | |
827 | ||
828 | port = filp->private_data; | |
829 | out_offset = 0; | |
830 | out_offset += snprintf(buf + out_offset, out_count, | |
831 | "name: %s\n", port->name ? port->name : ""); | |
832 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
833 | "guest_connected: %d\n", port->guest_connected); | |
834 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
835 | "host_connected: %d\n", port->host_connected); | |
836 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
837 | "is_console: %s\n", | |
838 | is_console_port(port) ? "yes" : "no"); | |
839 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
840 | "console_vtermno: %u\n", port->cons.vtermno); | |
841 | ||
842 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
843 | kfree(buf); | |
844 | return ret; | |
845 | } | |
846 | ||
847 | static const struct file_operations port_debugfs_ops = { | |
848 | .owner = THIS_MODULE, | |
849 | .open = debugfs_open, | |
850 | .read = debugfs_read, | |
851 | }; | |
852 | ||
1f7aa42d AS |
853 | /* Remove all port-specific data. */ |
854 | static int remove_port(struct port *port) | |
855 | { | |
a9cdd485 AS |
856 | struct port_buffer *buf; |
857 | ||
1f7aa42d AS |
858 | spin_lock_irq(&port->portdev->ports_lock); |
859 | list_del(&port->list); | |
860 | spin_unlock_irq(&port->portdev->ports_lock); | |
861 | ||
862 | if (is_console_port(port)) { | |
863 | spin_lock_irq(&pdrvdata_lock); | |
864 | list_del(&port->cons.list); | |
865 | spin_unlock_irq(&pdrvdata_lock); | |
866 | hvc_remove(port->cons.hvc); | |
867 | } | |
868 | if (port->guest_connected) | |
869 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
870 | ||
1f7aa42d AS |
871 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); |
872 | device_destroy(pdrvdata.class, port->dev->devt); | |
873 | cdev_del(&port->cdev); | |
874 | ||
a9cdd485 | 875 | /* Remove unused data this port might have received. */ |
1f7aa42d | 876 | discard_port_data(port); |
a9cdd485 AS |
877 | |
878 | /* Remove buffers we queued up for the Host to send us data in. */ | |
879 | while ((buf = port->in_vq->vq_ops->detach_unused_buf(port->in_vq))) | |
880 | free_buf(buf); | |
881 | ||
1f7aa42d AS |
882 | kfree(port->name); |
883 | ||
d99393ef AS |
884 | debugfs_remove(port->debugfs_file); |
885 | ||
1f7aa42d AS |
886 | kfree(port); |
887 | return 0; | |
888 | } | |
889 | ||
17634ba2 AS |
890 | /* Any private messages that the Host and Guest want to share */ |
891 | static void handle_control_message(struct ports_device *portdev, | |
892 | struct port_buffer *buf) | |
893 | { | |
894 | struct virtio_console_control *cpkt; | |
895 | struct port *port; | |
431edb8a AS |
896 | size_t name_size; |
897 | int err; | |
17634ba2 AS |
898 | |
899 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
900 | ||
901 | port = find_port_by_id(portdev, cpkt->id); | |
902 | if (!port) { | |
903 | /* No valid header at start of buffer. Drop it. */ | |
904 | dev_dbg(&portdev->vdev->dev, | |
905 | "Invalid index %u in control packet\n", cpkt->id); | |
906 | return; | |
907 | } | |
908 | ||
909 | switch (cpkt->event) { | |
910 | case VIRTIO_CONSOLE_CONSOLE_PORT: | |
911 | if (!cpkt->value) | |
912 | break; | |
913 | if (is_console_port(port)) | |
914 | break; | |
915 | ||
916 | init_port_console(port); | |
917 | /* | |
918 | * Could remove the port here in case init fails - but | |
919 | * have to notify the host first. | |
920 | */ | |
921 | break; | |
922 | case VIRTIO_CONSOLE_RESIZE: | |
923 | if (!is_console_port(port)) | |
924 | break; | |
925 | port->cons.hvc->irq_requested = 1; | |
926 | resize_console(port); | |
927 | break; | |
2030fa49 AS |
928 | case VIRTIO_CONSOLE_PORT_OPEN: |
929 | port->host_connected = cpkt->value; | |
930 | wake_up_interruptible(&port->waitqueue); | |
931 | break; | |
431edb8a AS |
932 | case VIRTIO_CONSOLE_PORT_NAME: |
933 | /* | |
934 | * Skip the size of the header and the cpkt to get the size | |
935 | * of the name that was sent | |
936 | */ | |
937 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
938 | ||
939 | port->name = kmalloc(name_size, GFP_KERNEL); | |
940 | if (!port->name) { | |
941 | dev_err(port->dev, | |
942 | "Not enough space to store port name\n"); | |
943 | break; | |
944 | } | |
945 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
946 | name_size - 1); | |
947 | port->name[name_size - 1] = 0; | |
948 | ||
949 | /* | |
950 | * Since we only have one sysfs attribute, 'name', | |
951 | * create it only if we have a name for the port. | |
952 | */ | |
953 | err = sysfs_create_group(&port->dev->kobj, | |
954 | &port_attribute_group); | |
ec64213c | 955 | if (err) { |
431edb8a AS |
956 | dev_err(port->dev, |
957 | "Error %d creating sysfs device attributes\n", | |
958 | err); | |
ec64213c AS |
959 | } else { |
960 | /* | |
961 | * Generate a udev event so that appropriate | |
962 | * symlinks can be created based on udev | |
963 | * rules. | |
964 | */ | |
965 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
966 | } | |
431edb8a | 967 | break; |
1f7aa42d AS |
968 | case VIRTIO_CONSOLE_PORT_REMOVE: |
969 | /* | |
970 | * Hot unplug the port. We don't decrement nr_ports | |
971 | * since we don't want to deal with extra complexities | |
972 | * of using the lowest-available port id: We can just | |
973 | * pick up the nr_ports number as the id and not have | |
974 | * userspace send it to us. This helps us in two | |
975 | * ways: | |
976 | * | |
977 | * - We don't need to have a 'port_id' field in the | |
978 | * config space when a port is hot-added. This is a | |
979 | * good thing as we might queue up multiple hotplug | |
980 | * requests issued in our workqueue. | |
981 | * | |
982 | * - Another way to deal with this would have been to | |
983 | * use a bitmap of the active ports and select the | |
984 | * lowest non-active port from that map. That | |
985 | * bloats the already tight config space and we | |
986 | * would end up artificially limiting the | |
987 | * max. number of ports to sizeof(bitmap). Right | |
988 | * now we can support 2^32 ports (as the port id is | |
989 | * stored in a u32 type). | |
990 | * | |
991 | */ | |
992 | remove_port(port); | |
993 | break; | |
17634ba2 AS |
994 | } |
995 | } | |
996 | ||
997 | static void control_work_handler(struct work_struct *work) | |
998 | { | |
999 | struct ports_device *portdev; | |
1000 | struct virtqueue *vq; | |
1001 | struct port_buffer *buf; | |
1002 | unsigned int len; | |
1003 | ||
1004 | portdev = container_of(work, struct ports_device, control_work); | |
1005 | vq = portdev->c_ivq; | |
1006 | ||
1007 | spin_lock(&portdev->cvq_lock); | |
1008 | while ((buf = vq->vq_ops->get_buf(vq, &len))) { | |
1009 | spin_unlock(&portdev->cvq_lock); | |
1010 | ||
1011 | buf->len = len; | |
1012 | buf->offset = 0; | |
1013 | ||
1014 | handle_control_message(portdev, buf); | |
1015 | ||
1016 | spin_lock(&portdev->cvq_lock); | |
1017 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
1018 | dev_warn(&portdev->vdev->dev, | |
1019 | "Error adding buffer to queue\n"); | |
1020 | free_buf(buf); | |
1021 | } | |
1022 | } | |
1023 | spin_unlock(&portdev->cvq_lock); | |
1024 | } | |
1025 | ||
1026 | static void in_intr(struct virtqueue *vq) | |
1027 | { | |
1028 | struct port *port; | |
1029 | unsigned long flags; | |
1030 | ||
1031 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1032 | if (!port) | |
1033 | return; | |
1034 | ||
1035 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d6933561 AS |
1036 | if (!port->inbuf) |
1037 | port->inbuf = get_inbuf(port); | |
17634ba2 | 1038 | |
88f251ac AS |
1039 | /* |
1040 | * Don't queue up data when port is closed. This condition | |
1041 | * can be reached when a console port is not yet connected (no | |
1042 | * tty is spawned) and the host sends out data to console | |
1043 | * ports. For generic serial ports, the host won't | |
1044 | * (shouldn't) send data till the guest is connected. | |
1045 | */ | |
1046 | if (!port->guest_connected) | |
1047 | discard_port_data(port); | |
1048 | ||
17634ba2 AS |
1049 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1050 | ||
2030fa49 AS |
1051 | wake_up_interruptible(&port->waitqueue); |
1052 | ||
17634ba2 AS |
1053 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1054 | hvc_kick(); | |
1055 | } | |
1056 | ||
1057 | static void control_intr(struct virtqueue *vq) | |
1058 | { | |
1059 | struct ports_device *portdev; | |
1060 | ||
1061 | portdev = vq->vdev->priv; | |
1062 | schedule_work(&portdev->control_work); | |
1063 | } | |
1064 | ||
7f5d810d AS |
1065 | static void config_intr(struct virtio_device *vdev) |
1066 | { | |
1067 | struct ports_device *portdev; | |
1068 | ||
1069 | portdev = vdev->priv; | |
1070 | if (use_multiport(portdev)) { | |
1071 | /* Handle port hot-add */ | |
1072 | schedule_work(&portdev->config_work); | |
1073 | } | |
1074 | /* | |
1075 | * We'll use this way of resizing only for legacy support. | |
1076 | * For newer userspace (VIRTIO_CONSOLE_F_MULTPORT+), use | |
1077 | * control messages to indicate console size changes so that | |
1078 | * it can be done per-port | |
1079 | */ | |
1080 | resize_console(find_port_by_id(portdev, 0)); | |
1081 | } | |
1082 | ||
22a29eac | 1083 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
17634ba2 AS |
1084 | { |
1085 | struct port_buffer *buf; | |
335a64a5 AS |
1086 | unsigned int nr_added_bufs; |
1087 | int ret; | |
17634ba2 | 1088 | |
335a64a5 | 1089 | nr_added_bufs = 0; |
17634ba2 AS |
1090 | do { |
1091 | buf = alloc_buf(PAGE_SIZE); | |
1092 | if (!buf) | |
1093 | break; | |
1094 | ||
1095 | spin_lock_irq(lock); | |
335a64a5 AS |
1096 | ret = add_inbuf(vq, buf); |
1097 | if (ret < 0) { | |
17634ba2 AS |
1098 | spin_unlock_irq(lock); |
1099 | free_buf(buf); | |
1100 | break; | |
1101 | } | |
335a64a5 | 1102 | nr_added_bufs++; |
17634ba2 | 1103 | spin_unlock_irq(lock); |
335a64a5 | 1104 | } while (ret > 0); |
22a29eac | 1105 | |
335a64a5 | 1106 | return nr_added_bufs; |
17634ba2 AS |
1107 | } |
1108 | ||
1109 | static int add_port(struct ports_device *portdev, u32 id) | |
d8a02bd5 | 1110 | { |
d99393ef | 1111 | char debugfs_name[16]; |
21206ede | 1112 | struct port *port; |
d6933561 | 1113 | struct port_buffer *buf; |
fb08bd27 | 1114 | dev_t devt; |
335a64a5 | 1115 | unsigned int nr_added_bufs; |
31610434 | 1116 | int err; |
31610434 | 1117 | |
1c85bf35 | 1118 | port = kmalloc(sizeof(*port), GFP_KERNEL); |
d8a02bd5 RR |
1119 | if (!port) { |
1120 | err = -ENOMEM; | |
1121 | goto fail; | |
f550804a | 1122 | } |
73954488 | 1123 | |
1c85bf35 | 1124 | port->portdev = portdev; |
17634ba2 | 1125 | port->id = id; |
203baab8 | 1126 | |
431edb8a | 1127 | port->name = NULL; |
203baab8 | 1128 | port->inbuf = NULL; |
17634ba2 | 1129 | port->cons.hvc = NULL; |
203baab8 | 1130 | |
3c7969cc | 1131 | port->host_connected = port->guest_connected = false; |
2030fa49 | 1132 | |
17634ba2 AS |
1133 | port->in_vq = portdev->in_vqs[port->id]; |
1134 | port->out_vq = portdev->out_vqs[port->id]; | |
31610434 | 1135 | |
2030fa49 | 1136 | cdev_init(&port->cdev, &port_fops); |
fb08bd27 AS |
1137 | |
1138 | devt = MKDEV(portdev->chr_major, id); | |
1139 | err = cdev_add(&port->cdev, devt, 1); | |
1140 | if (err < 0) { | |
1141 | dev_err(&port->portdev->vdev->dev, | |
1142 | "Error %d adding cdev for port %u\n", err, id); | |
1143 | goto free_port; | |
1144 | } | |
1145 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1146 | devt, port, "vport%up%u", | |
1147 | port->portdev->drv_index, id); | |
1148 | if (IS_ERR(port->dev)) { | |
1149 | err = PTR_ERR(port->dev); | |
1150 | dev_err(&port->portdev->vdev->dev, | |
1151 | "Error %d creating device for port %u\n", | |
1152 | err, id); | |
1153 | goto free_cdev; | |
1154 | } | |
1155 | ||
203baab8 | 1156 | spin_lock_init(&port->inbuf_lock); |
2030fa49 | 1157 | init_waitqueue_head(&port->waitqueue); |
203baab8 | 1158 | |
d6933561 | 1159 | /* Fill the in_vq with buffers so the host can send us data. */ |
335a64a5 AS |
1160 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); |
1161 | if (!nr_added_bufs) { | |
d6933561 | 1162 | dev_err(port->dev, "Error allocating inbufs\n"); |
1c85bf35 | 1163 | err = -ENOMEM; |
fb08bd27 | 1164 | goto free_device; |
1c85bf35 | 1165 | } |
31610434 | 1166 | |
17634ba2 AS |
1167 | /* |
1168 | * If we're not using multiport support, this has to be a console port | |
1169 | */ | |
1170 | if (!use_multiport(port->portdev)) { | |
1171 | err = init_port_console(port); | |
1172 | if (err) | |
d6933561 | 1173 | goto free_inbufs; |
17634ba2 AS |
1174 | } |
1175 | ||
1176 | spin_lock_irq(&portdev->ports_lock); | |
1177 | list_add_tail(&port->list, &port->portdev->ports); | |
1178 | spin_unlock_irq(&portdev->ports_lock); | |
1179 | ||
1180 | /* | |
1181 | * Tell the Host we're set so that it can send us various | |
1182 | * configuration parameters for this port (eg, port name, | |
1183 | * caching, whether this is a console port, etc.) | |
1184 | */ | |
1185 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
38edf58d | 1186 | |
d99393ef AS |
1187 | if (pdrvdata.debugfs_dir) { |
1188 | /* | |
1189 | * Finally, create the debugfs file that we can use to | |
1190 | * inspect a port's state at any time | |
1191 | */ | |
1192 | sprintf(debugfs_name, "vport%up%u", | |
1193 | port->portdev->drv_index, id); | |
1194 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, | |
1195 | pdrvdata.debugfs_dir, | |
1196 | port, | |
1197 | &port_debugfs_ops); | |
1198 | } | |
1c85bf35 AS |
1199 | return 0; |
1200 | ||
d6933561 AS |
1201 | free_inbufs: |
1202 | while ((buf = port->in_vq->vq_ops->detach_unused_buf(port->in_vq))) | |
1203 | free_buf(buf); | |
fb08bd27 AS |
1204 | free_device: |
1205 | device_destroy(pdrvdata.class, port->dev->devt); | |
1206 | free_cdev: | |
1207 | cdev_del(&port->cdev); | |
1c85bf35 AS |
1208 | free_port: |
1209 | kfree(port); | |
1210 | fail: | |
1211 | return err; | |
1212 | } | |
1213 | ||
7f5d810d AS |
1214 | /* |
1215 | * The workhandler for config-space updates. | |
1216 | * | |
1217 | * This is called when ports are hot-added. | |
1218 | */ | |
1219 | static void config_work_handler(struct work_struct *work) | |
1220 | { | |
1221 | struct virtio_console_config virtconconf; | |
1222 | struct ports_device *portdev; | |
1223 | struct virtio_device *vdev; | |
1224 | int err; | |
1225 | ||
1226 | portdev = container_of(work, struct ports_device, config_work); | |
1227 | ||
1228 | vdev = portdev->vdev; | |
1229 | vdev->config->get(vdev, | |
1230 | offsetof(struct virtio_console_config, nr_ports), | |
1231 | &virtconconf.nr_ports, | |
1232 | sizeof(virtconconf.nr_ports)); | |
1233 | ||
1234 | if (portdev->config.nr_ports == virtconconf.nr_ports) { | |
1235 | /* | |
1236 | * Port 0 got hot-added. Since we already did all the | |
1237 | * other initialisation for it, just tell the Host | |
1f7aa42d AS |
1238 | * that the port is ready if we find the port. In |
1239 | * case the port was hot-removed earlier, we call | |
1240 | * add_port to add the port. | |
7f5d810d AS |
1241 | */ |
1242 | struct port *port; | |
1243 | ||
1244 | port = find_port_by_id(portdev, 0); | |
1f7aa42d AS |
1245 | if (!port) |
1246 | add_port(portdev, 0); | |
1247 | else | |
1248 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
7f5d810d AS |
1249 | return; |
1250 | } | |
1251 | if (virtconconf.nr_ports > portdev->config.max_nr_ports) { | |
1252 | dev_warn(&vdev->dev, | |
1253 | "More ports specified (%u) than allowed (%u)", | |
1254 | portdev->config.nr_ports + 1, | |
1255 | portdev->config.max_nr_ports); | |
1256 | return; | |
1257 | } | |
1258 | if (virtconconf.nr_ports < portdev->config.nr_ports) | |
1259 | return; | |
1260 | ||
1261 | /* Hot-add ports */ | |
1262 | while (virtconconf.nr_ports - portdev->config.nr_ports) { | |
1263 | err = add_port(portdev, portdev->config.nr_ports); | |
1264 | if (err) | |
1265 | break; | |
1266 | portdev->config.nr_ports++; | |
1267 | } | |
1268 | } | |
1269 | ||
2658a79a AS |
1270 | static int init_vqs(struct ports_device *portdev) |
1271 | { | |
1272 | vq_callback_t **io_callbacks; | |
1273 | char **io_names; | |
1274 | struct virtqueue **vqs; | |
17634ba2 | 1275 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1276 | int err; |
1277 | ||
17634ba2 AS |
1278 | nr_ports = portdev->config.max_nr_ports; |
1279 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1280 | |
1281 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
1282 | if (!vqs) { | |
1283 | err = -ENOMEM; | |
1284 | goto fail; | |
1285 | } | |
1286 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); | |
1287 | if (!io_callbacks) { | |
1288 | err = -ENOMEM; | |
1289 | goto free_vqs; | |
1290 | } | |
1291 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); | |
1292 | if (!io_names) { | |
1293 | err = -ENOMEM; | |
1294 | goto free_callbacks; | |
1295 | } | |
1296 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1297 | GFP_KERNEL); | |
1298 | if (!portdev->in_vqs) { | |
1299 | err = -ENOMEM; | |
1300 | goto free_names; | |
1301 | } | |
1302 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1303 | GFP_KERNEL); | |
1304 | if (!portdev->out_vqs) { | |
1305 | err = -ENOMEM; | |
1306 | goto free_invqs; | |
1307 | } | |
1308 | ||
17634ba2 AS |
1309 | /* |
1310 | * For backward compat (newer host but older guest), the host | |
1311 | * spawns a console port first and also inits the vqs for port | |
1312 | * 0 before others. | |
1313 | */ | |
1314 | j = 0; | |
1315 | io_callbacks[j] = in_intr; | |
1316 | io_callbacks[j + 1] = NULL; | |
1317 | io_names[j] = "input"; | |
1318 | io_names[j + 1] = "output"; | |
1319 | j += 2; | |
1320 | ||
1321 | if (use_multiport(portdev)) { | |
1322 | io_callbacks[j] = control_intr; | |
1323 | io_callbacks[j + 1] = NULL; | |
1324 | io_names[j] = "control-i"; | |
1325 | io_names[j + 1] = "control-o"; | |
1326 | ||
1327 | for (i = 1; i < nr_ports; i++) { | |
1328 | j += 2; | |
1329 | io_callbacks[j] = in_intr; | |
1330 | io_callbacks[j + 1] = NULL; | |
1331 | io_names[j] = "input"; | |
1332 | io_names[j + 1] = "output"; | |
1333 | } | |
1334 | } | |
2658a79a AS |
1335 | /* Find the queues. */ |
1336 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1337 | io_callbacks, | |
1338 | (const char **)io_names); | |
1339 | if (err) | |
1340 | goto free_outvqs; | |
1341 | ||
17634ba2 | 1342 | j = 0; |
2658a79a AS |
1343 | portdev->in_vqs[0] = vqs[0]; |
1344 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1345 | j += 2; |
1346 | if (use_multiport(portdev)) { | |
1347 | portdev->c_ivq = vqs[j]; | |
1348 | portdev->c_ovq = vqs[j + 1]; | |
1349 | ||
1350 | for (i = 1; i < nr_ports; i++) { | |
1351 | j += 2; | |
1352 | portdev->in_vqs[i] = vqs[j]; | |
1353 | portdev->out_vqs[i] = vqs[j + 1]; | |
1354 | } | |
1355 | } | |
2658a79a AS |
1356 | kfree(io_callbacks); |
1357 | kfree(io_names); | |
1358 | kfree(vqs); | |
1359 | ||
1360 | return 0; | |
1361 | ||
1362 | free_names: | |
1363 | kfree(io_names); | |
1364 | free_callbacks: | |
1365 | kfree(io_callbacks); | |
1366 | free_outvqs: | |
1367 | kfree(portdev->out_vqs); | |
1368 | free_invqs: | |
1369 | kfree(portdev->in_vqs); | |
1370 | free_vqs: | |
1371 | kfree(vqs); | |
1372 | fail: | |
1373 | return err; | |
1374 | } | |
1375 | ||
fb08bd27 AS |
1376 | static const struct file_operations portdev_fops = { |
1377 | .owner = THIS_MODULE, | |
1378 | }; | |
1379 | ||
1c85bf35 AS |
1380 | /* |
1381 | * Once we're further in boot, we get probed like any other virtio | |
1382 | * device. | |
17634ba2 AS |
1383 | * |
1384 | * If the host also supports multiple console ports, we check the | |
1385 | * config space to see how many ports the host has spawned. We | |
1386 | * initialize each port found. | |
1c85bf35 AS |
1387 | */ |
1388 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1389 | { | |
1c85bf35 | 1390 | struct ports_device *portdev; |
17634ba2 | 1391 | u32 i; |
1c85bf35 | 1392 | int err; |
17634ba2 | 1393 | bool multiport; |
1c85bf35 AS |
1394 | |
1395 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1396 | if (!portdev) { | |
1397 | err = -ENOMEM; | |
1398 | goto fail; | |
1399 | } | |
1400 | ||
1401 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1402 | portdev->vdev = vdev; | |
1403 | vdev->priv = portdev; | |
1404 | ||
fb08bd27 AS |
1405 | spin_lock_irq(&pdrvdata_lock); |
1406 | portdev->drv_index = pdrvdata.index++; | |
1407 | spin_unlock_irq(&pdrvdata_lock); | |
1408 | ||
1409 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1410 | &portdev_fops); | |
1411 | if (portdev->chr_major < 0) { | |
1412 | dev_err(&vdev->dev, | |
1413 | "Error %d registering chrdev for device %u\n", | |
1414 | portdev->chr_major, portdev->drv_index); | |
1415 | err = portdev->chr_major; | |
1416 | goto free; | |
1417 | } | |
1418 | ||
17634ba2 AS |
1419 | multiport = false; |
1420 | portdev->config.nr_ports = 1; | |
1421 | portdev->config.max_nr_ports = 1; | |
1422 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { | |
1423 | multiport = true; | |
1424 | vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; | |
1425 | ||
1426 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1427 | nr_ports), | |
1428 | &portdev->config.nr_ports, | |
1429 | sizeof(portdev->config.nr_ports)); | |
1430 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1431 | max_nr_ports), | |
1432 | &portdev->config.max_nr_ports, | |
1433 | sizeof(portdev->config.max_nr_ports)); | |
1434 | if (portdev->config.nr_ports > portdev->config.max_nr_ports) { | |
1435 | dev_warn(&vdev->dev, | |
1436 | "More ports (%u) specified than allowed (%u). Will init %u ports.", | |
1437 | portdev->config.nr_ports, | |
1438 | portdev->config.max_nr_ports, | |
1439 | portdev->config.max_nr_ports); | |
1440 | ||
1441 | portdev->config.nr_ports = portdev->config.max_nr_ports; | |
1442 | } | |
1443 | } | |
1444 | ||
1445 | /* Let the Host know we support multiple ports.*/ | |
1446 | vdev->config->finalize_features(vdev); | |
1447 | ||
2658a79a AS |
1448 | err = init_vqs(portdev); |
1449 | if (err < 0) { | |
1450 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1451 | goto free_chrdev; |
2658a79a | 1452 | } |
1c85bf35 | 1453 | |
17634ba2 AS |
1454 | spin_lock_init(&portdev->ports_lock); |
1455 | INIT_LIST_HEAD(&portdev->ports); | |
1456 | ||
1457 | if (multiport) { | |
335a64a5 AS |
1458 | unsigned int nr_added_bufs; |
1459 | ||
17634ba2 AS |
1460 | spin_lock_init(&portdev->cvq_lock); |
1461 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
7f5d810d | 1462 | INIT_WORK(&portdev->config_work, &config_work_handler); |
17634ba2 | 1463 | |
335a64a5 AS |
1464 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
1465 | if (!nr_added_bufs) { | |
22a29eac AS |
1466 | dev_err(&vdev->dev, |
1467 | "Error allocating buffers for control queue\n"); | |
1468 | err = -ENOMEM; | |
1469 | goto free_vqs; | |
1470 | } | |
17634ba2 AS |
1471 | } |
1472 | ||
1473 | for (i = 0; i < portdev->config.nr_ports; i++) | |
1474 | add_port(portdev, i); | |
1c85bf35 | 1475 | |
971f3390 RR |
1476 | /* Start using the new console output. */ |
1477 | early_put_chars = NULL; | |
31610434 RR |
1478 | return 0; |
1479 | ||
22a29eac AS |
1480 | free_vqs: |
1481 | vdev->config->del_vqs(vdev); | |
1482 | kfree(portdev->in_vqs); | |
1483 | kfree(portdev->out_vqs); | |
fb08bd27 AS |
1484 | free_chrdev: |
1485 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1486 | free: |
1c85bf35 | 1487 | kfree(portdev); |
31610434 RR |
1488 | fail: |
1489 | return err; | |
1490 | } | |
1491 | ||
7177876f AS |
1492 | static void virtcons_remove(struct virtio_device *vdev) |
1493 | { | |
1494 | struct ports_device *portdev; | |
1495 | struct port *port, *port2; | |
1496 | struct port_buffer *buf; | |
1497 | unsigned int len; | |
1498 | ||
1499 | portdev = vdev->priv; | |
1500 | ||
1501 | cancel_work_sync(&portdev->control_work); | |
1502 | cancel_work_sync(&portdev->config_work); | |
1503 | ||
1504 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
1505 | remove_port(port); | |
1506 | ||
1507 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
1508 | ||
1509 | while ((buf = portdev->c_ivq->vq_ops->get_buf(portdev->c_ivq, &len))) | |
1510 | free_buf(buf); | |
1511 | ||
1512 | while ((buf = portdev->c_ivq->vq_ops->detach_unused_buf(portdev->c_ivq))) | |
1513 | free_buf(buf); | |
1514 | ||
1515 | vdev->config->del_vqs(vdev); | |
1516 | kfree(portdev->in_vqs); | |
1517 | kfree(portdev->out_vqs); | |
1518 | ||
1519 | kfree(portdev); | |
1520 | } | |
1521 | ||
31610434 RR |
1522 | static struct virtio_device_id id_table[] = { |
1523 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1524 | { 0 }, | |
1525 | }; | |
1526 | ||
c2983458 CB |
1527 | static unsigned int features[] = { |
1528 | VIRTIO_CONSOLE_F_SIZE, | |
17634ba2 | 1529 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1530 | }; |
1531 | ||
31610434 | 1532 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1533 | .feature_table = features, |
1534 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1535 | .driver.name = KBUILD_MODNAME, |
1536 | .driver.owner = THIS_MODULE, | |
1537 | .id_table = id_table, | |
1538 | .probe = virtcons_probe, | |
7177876f | 1539 | .remove = virtcons_remove, |
7f5d810d | 1540 | .config_changed = config_intr, |
31610434 RR |
1541 | }; |
1542 | ||
1543 | static int __init init(void) | |
1544 | { | |
fb08bd27 AS |
1545 | int err; |
1546 | ||
1547 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
1548 | if (IS_ERR(pdrvdata.class)) { | |
1549 | err = PTR_ERR(pdrvdata.class); | |
1550 | pr_err("Error %d creating virtio-ports class\n", err); | |
1551 | return err; | |
1552 | } | |
d99393ef AS |
1553 | |
1554 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
1555 | if (!pdrvdata.debugfs_dir) { | |
1556 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
1557 | PTR_ERR(pdrvdata.debugfs_dir)); | |
1558 | } | |
38edf58d AS |
1559 | INIT_LIST_HEAD(&pdrvdata.consoles); |
1560 | ||
31610434 RR |
1561 | return register_virtio_driver(&virtio_console); |
1562 | } | |
7177876f AS |
1563 | |
1564 | static void __exit fini(void) | |
1565 | { | |
1566 | unregister_virtio_driver(&virtio_console); | |
1567 | ||
1568 | class_destroy(pdrvdata.class); | |
1569 | if (pdrvdata.debugfs_dir) | |
1570 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
1571 | } | |
31610434 | 1572 | module_init(init); |
7177876f | 1573 | module_exit(fini); |
31610434 RR |
1574 | |
1575 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1576 | MODULE_DESCRIPTION("Virtio console driver"); | |
1577 | MODULE_LICENSE("GPL"); |