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> | |
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) { | |
9ff4cfab | 419 | in_count = 0; |
f997f00b AS |
420 | goto fail; |
421 | } | |
422 | ||
9ff4cfab | 423 | /* Wait till the host acknowledges it pushed out the data we sent. */ |
f997f00b AS |
424 | while (!out_vq->vq_ops->get_buf(out_vq, &len)) |
425 | cpu_relax(); | |
426 | fail: | |
427 | /* We're expected to return the amount of data we wrote */ | |
9ff4cfab | 428 | return in_count; |
f997f00b AS |
429 | } |
430 | ||
203baab8 AS |
431 | /* |
432 | * Give out the data that's requested from the buffer that we have | |
433 | * queued up. | |
434 | */ | |
b766ceed AS |
435 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
436 | bool to_user) | |
203baab8 AS |
437 | { |
438 | struct port_buffer *buf; | |
439 | unsigned long flags; | |
440 | ||
441 | if (!out_count || !port_has_data(port)) | |
442 | return 0; | |
443 | ||
444 | buf = port->inbuf; | |
b766ceed | 445 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 446 | |
b766ceed AS |
447 | if (to_user) { |
448 | ssize_t ret; | |
449 | ||
450 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
451 | if (ret) | |
452 | return -EFAULT; | |
453 | } else { | |
454 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
455 | } | |
203baab8 | 456 | |
203baab8 AS |
457 | buf->offset += out_count; |
458 | ||
459 | if (buf->offset == buf->len) { | |
460 | /* | |
461 | * We're done using all the data in this buffer. | |
462 | * Re-queue so that the Host can send us more data. | |
463 | */ | |
464 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
465 | port->inbuf = NULL; | |
466 | ||
467 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 468 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
469 | |
470 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
471 | } | |
b766ceed | 472 | /* Return the number of bytes actually copied */ |
203baab8 | 473 | return out_count; |
e27b5198 AS |
474 | } |
475 | ||
2030fa49 AS |
476 | /* The condition that must be true for polling to end */ |
477 | static bool wait_is_over(struct port *port) | |
478 | { | |
479 | return port_has_data(port) || !port->host_connected; | |
480 | } | |
481 | ||
482 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, | |
483 | size_t count, loff_t *offp) | |
484 | { | |
485 | struct port *port; | |
486 | ssize_t ret; | |
487 | ||
488 | port = filp->private_data; | |
489 | ||
490 | if (!port_has_data(port)) { | |
491 | /* | |
492 | * If nothing's connected on the host just return 0 in | |
493 | * case of list_empty; this tells the userspace app | |
494 | * that there's no connection | |
495 | */ | |
496 | if (!port->host_connected) | |
497 | return 0; | |
498 | if (filp->f_flags & O_NONBLOCK) | |
499 | return -EAGAIN; | |
500 | ||
501 | ret = wait_event_interruptible(port->waitqueue, | |
502 | wait_is_over(port)); | |
503 | if (ret < 0) | |
504 | return ret; | |
505 | } | |
506 | /* | |
507 | * We could've received a disconnection message while we were | |
508 | * waiting for more data. | |
509 | * | |
510 | * This check is not clubbed in the if() statement above as we | |
511 | * might receive some data as well as the host could get | |
512 | * disconnected after we got woken up from our wait. So we | |
513 | * really want to give off whatever data we have and only then | |
514 | * check for host_connected. | |
515 | */ | |
516 | if (!port_has_data(port) && !port->host_connected) | |
517 | return 0; | |
518 | ||
519 | return fill_readbuf(port, ubuf, count, true); | |
520 | } | |
521 | ||
522 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
523 | size_t count, loff_t *offp) | |
524 | { | |
525 | struct port *port; | |
526 | char *buf; | |
527 | ssize_t ret; | |
528 | ||
529 | port = filp->private_data; | |
530 | ||
531 | count = min((size_t)(32 * 1024), count); | |
532 | ||
533 | buf = kmalloc(count, GFP_KERNEL); | |
534 | if (!buf) | |
535 | return -ENOMEM; | |
536 | ||
537 | ret = copy_from_user(buf, ubuf, count); | |
538 | if (ret) { | |
539 | ret = -EFAULT; | |
540 | goto free_buf; | |
541 | } | |
542 | ||
543 | ret = send_buf(port, buf, count); | |
544 | free_buf: | |
545 | kfree(buf); | |
546 | return ret; | |
547 | } | |
548 | ||
549 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
550 | { | |
551 | struct port *port; | |
552 | unsigned int ret; | |
553 | ||
554 | port = filp->private_data; | |
555 | poll_wait(filp, &port->waitqueue, wait); | |
556 | ||
557 | ret = 0; | |
558 | if (port->inbuf) | |
559 | ret |= POLLIN | POLLRDNORM; | |
560 | if (port->host_connected) | |
561 | ret |= POLLOUT; | |
562 | if (!port->host_connected) | |
563 | ret |= POLLHUP; | |
564 | ||
565 | return ret; | |
566 | } | |
567 | ||
568 | static int port_fops_release(struct inode *inode, struct file *filp) | |
569 | { | |
570 | struct port *port; | |
571 | ||
572 | port = filp->private_data; | |
573 | ||
574 | /* Notify host of port being closed */ | |
575 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
576 | ||
88f251ac | 577 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
578 | port->guest_connected = false; |
579 | ||
88f251ac AS |
580 | discard_port_data(port); |
581 | ||
582 | spin_unlock_irq(&port->inbuf_lock); | |
583 | ||
2030fa49 AS |
584 | return 0; |
585 | } | |
586 | ||
587 | static int port_fops_open(struct inode *inode, struct file *filp) | |
588 | { | |
589 | struct cdev *cdev = inode->i_cdev; | |
590 | struct port *port; | |
591 | ||
592 | port = container_of(cdev, struct port, cdev); | |
593 | filp->private_data = port; | |
594 | ||
595 | /* | |
596 | * Don't allow opening of console port devices -- that's done | |
597 | * via /dev/hvc | |
598 | */ | |
599 | if (is_console_port(port)) | |
600 | return -ENXIO; | |
601 | ||
3c7969cc AS |
602 | /* Allow only one process to open a particular port at a time */ |
603 | spin_lock_irq(&port->inbuf_lock); | |
604 | if (port->guest_connected) { | |
605 | spin_unlock_irq(&port->inbuf_lock); | |
606 | return -EMFILE; | |
607 | } | |
608 | ||
609 | port->guest_connected = true; | |
610 | spin_unlock_irq(&port->inbuf_lock); | |
611 | ||
2030fa49 AS |
612 | /* Notify host of port being opened */ |
613 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
618 | /* | |
619 | * The file operations that we support: programs in the guest can open | |
620 | * a console device, read from it, write to it, poll for data and | |
621 | * close it. The devices are at | |
622 | * /dev/vport<device number>p<port number> | |
623 | */ | |
624 | static const struct file_operations port_fops = { | |
625 | .owner = THIS_MODULE, | |
626 | .open = port_fops_open, | |
627 | .read = port_fops_read, | |
628 | .write = port_fops_write, | |
629 | .poll = port_fops_poll, | |
630 | .release = port_fops_release, | |
631 | }; | |
632 | ||
a23ea924 RR |
633 | /* |
634 | * The put_chars() callback is pretty straightforward. | |
31610434 | 635 | * |
a23ea924 RR |
636 | * We turn the characters into a scatter-gather list, add it to the |
637 | * output queue and then kick the Host. Then we sit here waiting for | |
638 | * it to finish: inefficient in theory, but in practice | |
639 | * implementations will do it immediately (lguest's Launcher does). | |
640 | */ | |
31610434 RR |
641 | static int put_chars(u32 vtermno, const char *buf, int count) |
642 | { | |
21206ede | 643 | struct port *port; |
38edf58d | 644 | |
162a689a FD |
645 | if (unlikely(early_put_chars)) |
646 | return early_put_chars(vtermno, buf, count); | |
647 | ||
38edf58d AS |
648 | port = find_port_by_vtermno(vtermno); |
649 | if (!port) | |
650 | return 0; | |
31610434 | 651 | |
f997f00b | 652 | return send_buf(port, (void *)buf, count); |
31610434 RR |
653 | } |
654 | ||
a23ea924 RR |
655 | /* |
656 | * get_chars() is the callback from the hvc_console infrastructure | |
657 | * when an interrupt is received. | |
31610434 | 658 | * |
203baab8 AS |
659 | * We call out to fill_readbuf that gets us the required data from the |
660 | * buffers that are queued up. | |
a23ea924 | 661 | */ |
31610434 RR |
662 | static int get_chars(u32 vtermno, char *buf, int count) |
663 | { | |
21206ede RR |
664 | struct port *port; |
665 | ||
38edf58d AS |
666 | port = find_port_by_vtermno(vtermno); |
667 | if (!port) | |
668 | return 0; | |
21206ede | 669 | |
31610434 | 670 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 671 | BUG_ON(!port->in_vq); |
31610434 | 672 | |
b766ceed | 673 | return fill_readbuf(port, buf, count, false); |
31610434 | 674 | } |
31610434 | 675 | |
cb06e367 | 676 | static void resize_console(struct port *port) |
c2983458 | 677 | { |
cb06e367 | 678 | struct virtio_device *vdev; |
c2983458 CB |
679 | struct winsize ws; |
680 | ||
2de16a49 AS |
681 | /* The port could have been hot-unplugged */ |
682 | if (!port) | |
683 | return; | |
684 | ||
cb06e367 AS |
685 | vdev = port->portdev->vdev; |
686 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) { | |
687 | vdev->config->get(vdev, | |
688 | offsetof(struct virtio_console_config, cols), | |
689 | &ws.ws_col, sizeof(u16)); | |
690 | vdev->config->get(vdev, | |
691 | offsetof(struct virtio_console_config, rows), | |
692 | &ws.ws_row, sizeof(u16)); | |
4f23c573 | 693 | hvc_resize(port->cons.hvc, ws); |
c2983458 CB |
694 | } |
695 | } | |
696 | ||
38edf58d | 697 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
698 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
699 | { | |
38edf58d AS |
700 | struct port *port; |
701 | ||
702 | port = find_port_by_vtermno(hp->vtermno); | |
703 | if (!port) | |
704 | return -EINVAL; | |
705 | ||
91fcad19 | 706 | hp->irq_requested = 1; |
cb06e367 | 707 | resize_console(port); |
c2983458 | 708 | |
91fcad19 CB |
709 | return 0; |
710 | } | |
711 | ||
712 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
713 | { | |
714 | hp->irq_requested = 0; | |
715 | } | |
716 | ||
17634ba2 | 717 | /* The operations for console ports. */ |
1dff3996 | 718 | static const struct hv_ops hv_ops = { |
971f3390 RR |
719 | .get_chars = get_chars, |
720 | .put_chars = put_chars, | |
721 | .notifier_add = notifier_add_vio, | |
722 | .notifier_del = notifier_del_vio, | |
723 | .notifier_hangup = notifier_del_vio, | |
724 | }; | |
725 | ||
726 | /* | |
727 | * Console drivers are initialized very early so boot messages can go | |
728 | * out, so we do things slightly differently from the generic virtio | |
729 | * initialization of the net and block drivers. | |
730 | * | |
731 | * At this stage, the console is output-only. It's too early to set | |
732 | * up a virtqueue, so we let the drivers do some boutique early-output | |
733 | * thing. | |
734 | */ | |
735 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
736 | { | |
737 | early_put_chars = put_chars; | |
738 | return hvc_instantiate(0, 0, &hv_ops); | |
739 | } | |
740 | ||
17634ba2 | 741 | int init_port_console(struct port *port) |
cfa6d379 AS |
742 | { |
743 | int ret; | |
744 | ||
745 | /* | |
746 | * The Host's telling us this port is a console port. Hook it | |
747 | * up with an hvc console. | |
748 | * | |
749 | * To set up and manage our virtual console, we call | |
750 | * hvc_alloc(). | |
751 | * | |
752 | * The first argument of hvc_alloc() is the virtual console | |
753 | * number. The second argument is the parameter for the | |
754 | * notification mechanism (like irq number). We currently | |
755 | * leave this as zero, virtqueues have implicit notifications. | |
756 | * | |
757 | * The third argument is a "struct hv_ops" containing the | |
758 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
759 | * pointers. The final argument is the output buffer size: we | |
760 | * can do any size, so we put PAGE_SIZE here. | |
761 | */ | |
762 | port->cons.vtermno = pdrvdata.next_vtermno; | |
763 | ||
764 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
765 | if (IS_ERR(port->cons.hvc)) { | |
766 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
767 | dev_err(port->dev, |
768 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
769 | port->cons.hvc = NULL; |
770 | return ret; | |
771 | } | |
772 | spin_lock_irq(&pdrvdata_lock); | |
773 | pdrvdata.next_vtermno++; | |
774 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
775 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 776 | port->guest_connected = true; |
cfa6d379 | 777 | |
2030fa49 AS |
778 | /* Notify host of port being opened */ |
779 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
780 | ||
cfa6d379 AS |
781 | return 0; |
782 | } | |
783 | ||
431edb8a AS |
784 | static ssize_t show_port_name(struct device *dev, |
785 | struct device_attribute *attr, char *buffer) | |
786 | { | |
787 | struct port *port; | |
788 | ||
789 | port = dev_get_drvdata(dev); | |
790 | ||
791 | return sprintf(buffer, "%s\n", port->name); | |
792 | } | |
793 | ||
794 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
795 | ||
796 | static struct attribute *port_sysfs_entries[] = { | |
797 | &dev_attr_name.attr, | |
798 | NULL | |
799 | }; | |
800 | ||
801 | static struct attribute_group port_attribute_group = { | |
802 | .name = NULL, /* put in device directory */ | |
803 | .attrs = port_sysfs_entries, | |
804 | }; | |
805 | ||
d99393ef AS |
806 | static int debugfs_open(struct inode *inode, struct file *filp) |
807 | { | |
808 | filp->private_data = inode->i_private; | |
809 | return 0; | |
810 | } | |
811 | ||
812 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, | |
813 | size_t count, loff_t *offp) | |
814 | { | |
815 | struct port *port; | |
816 | char *buf; | |
817 | ssize_t ret, out_offset, out_count; | |
818 | ||
819 | out_count = 1024; | |
820 | buf = kmalloc(out_count, GFP_KERNEL); | |
821 | if (!buf) | |
822 | return -ENOMEM; | |
823 | ||
824 | port = filp->private_data; | |
825 | out_offset = 0; | |
826 | out_offset += snprintf(buf + out_offset, out_count, | |
827 | "name: %s\n", port->name ? port->name : ""); | |
828 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
829 | "guest_connected: %d\n", port->guest_connected); | |
830 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
831 | "host_connected: %d\n", port->host_connected); | |
832 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
833 | "is_console: %s\n", | |
834 | is_console_port(port) ? "yes" : "no"); | |
835 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
836 | "console_vtermno: %u\n", port->cons.vtermno); | |
837 | ||
838 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
839 | kfree(buf); | |
840 | return ret; | |
841 | } | |
842 | ||
843 | static const struct file_operations port_debugfs_ops = { | |
844 | .owner = THIS_MODULE, | |
845 | .open = debugfs_open, | |
846 | .read = debugfs_read, | |
847 | }; | |
848 | ||
1f7aa42d AS |
849 | /* Remove all port-specific data. */ |
850 | static int remove_port(struct port *port) | |
851 | { | |
a9cdd485 AS |
852 | struct port_buffer *buf; |
853 | ||
1f7aa42d AS |
854 | spin_lock_irq(&port->portdev->ports_lock); |
855 | list_del(&port->list); | |
856 | spin_unlock_irq(&port->portdev->ports_lock); | |
857 | ||
858 | if (is_console_port(port)) { | |
859 | spin_lock_irq(&pdrvdata_lock); | |
860 | list_del(&port->cons.list); | |
861 | spin_unlock_irq(&pdrvdata_lock); | |
862 | hvc_remove(port->cons.hvc); | |
863 | } | |
864 | if (port->guest_connected) | |
865 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
866 | ||
1f7aa42d AS |
867 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); |
868 | device_destroy(pdrvdata.class, port->dev->devt); | |
869 | cdev_del(&port->cdev); | |
870 | ||
a9cdd485 | 871 | /* Remove unused data this port might have received. */ |
1f7aa42d | 872 | discard_port_data(port); |
a9cdd485 AS |
873 | |
874 | /* Remove buffers we queued up for the Host to send us data in. */ | |
875 | while ((buf = port->in_vq->vq_ops->detach_unused_buf(port->in_vq))) | |
876 | free_buf(buf); | |
877 | ||
1f7aa42d AS |
878 | kfree(port->name); |
879 | ||
d99393ef AS |
880 | debugfs_remove(port->debugfs_file); |
881 | ||
1f7aa42d AS |
882 | kfree(port); |
883 | return 0; | |
884 | } | |
885 | ||
17634ba2 AS |
886 | /* Any private messages that the Host and Guest want to share */ |
887 | static void handle_control_message(struct ports_device *portdev, | |
888 | struct port_buffer *buf) | |
889 | { | |
890 | struct virtio_console_control *cpkt; | |
891 | struct port *port; | |
431edb8a AS |
892 | size_t name_size; |
893 | int err; | |
17634ba2 AS |
894 | |
895 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
896 | ||
897 | port = find_port_by_id(portdev, cpkt->id); | |
898 | if (!port) { | |
899 | /* No valid header at start of buffer. Drop it. */ | |
900 | dev_dbg(&portdev->vdev->dev, | |
901 | "Invalid index %u in control packet\n", cpkt->id); | |
902 | return; | |
903 | } | |
904 | ||
905 | switch (cpkt->event) { | |
906 | case VIRTIO_CONSOLE_CONSOLE_PORT: | |
907 | if (!cpkt->value) | |
908 | break; | |
909 | if (is_console_port(port)) | |
910 | break; | |
911 | ||
912 | init_port_console(port); | |
913 | /* | |
914 | * Could remove the port here in case init fails - but | |
915 | * have to notify the host first. | |
916 | */ | |
917 | break; | |
918 | case VIRTIO_CONSOLE_RESIZE: | |
919 | if (!is_console_port(port)) | |
920 | break; | |
921 | port->cons.hvc->irq_requested = 1; | |
922 | resize_console(port); | |
923 | break; | |
2030fa49 AS |
924 | case VIRTIO_CONSOLE_PORT_OPEN: |
925 | port->host_connected = cpkt->value; | |
926 | wake_up_interruptible(&port->waitqueue); | |
927 | break; | |
431edb8a AS |
928 | case VIRTIO_CONSOLE_PORT_NAME: |
929 | /* | |
930 | * Skip the size of the header and the cpkt to get the size | |
931 | * of the name that was sent | |
932 | */ | |
933 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
934 | ||
935 | port->name = kmalloc(name_size, GFP_KERNEL); | |
936 | if (!port->name) { | |
937 | dev_err(port->dev, | |
938 | "Not enough space to store port name\n"); | |
939 | break; | |
940 | } | |
941 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
942 | name_size - 1); | |
943 | port->name[name_size - 1] = 0; | |
944 | ||
945 | /* | |
946 | * Since we only have one sysfs attribute, 'name', | |
947 | * create it only if we have a name for the port. | |
948 | */ | |
949 | err = sysfs_create_group(&port->dev->kobj, | |
950 | &port_attribute_group); | |
ec64213c | 951 | if (err) { |
431edb8a AS |
952 | dev_err(port->dev, |
953 | "Error %d creating sysfs device attributes\n", | |
954 | err); | |
ec64213c AS |
955 | } else { |
956 | /* | |
957 | * Generate a udev event so that appropriate | |
958 | * symlinks can be created based on udev | |
959 | * rules. | |
960 | */ | |
961 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
962 | } | |
431edb8a | 963 | break; |
1f7aa42d AS |
964 | case VIRTIO_CONSOLE_PORT_REMOVE: |
965 | /* | |
966 | * Hot unplug the port. We don't decrement nr_ports | |
967 | * since we don't want to deal with extra complexities | |
968 | * of using the lowest-available port id: We can just | |
969 | * pick up the nr_ports number as the id and not have | |
970 | * userspace send it to us. This helps us in two | |
971 | * ways: | |
972 | * | |
973 | * - We don't need to have a 'port_id' field in the | |
974 | * config space when a port is hot-added. This is a | |
975 | * good thing as we might queue up multiple hotplug | |
976 | * requests issued in our workqueue. | |
977 | * | |
978 | * - Another way to deal with this would have been to | |
979 | * use a bitmap of the active ports and select the | |
980 | * lowest non-active port from that map. That | |
981 | * bloats the already tight config space and we | |
982 | * would end up artificially limiting the | |
983 | * max. number of ports to sizeof(bitmap). Right | |
984 | * now we can support 2^32 ports (as the port id is | |
985 | * stored in a u32 type). | |
986 | * | |
987 | */ | |
988 | remove_port(port); | |
989 | break; | |
17634ba2 AS |
990 | } |
991 | } | |
992 | ||
993 | static void control_work_handler(struct work_struct *work) | |
994 | { | |
995 | struct ports_device *portdev; | |
996 | struct virtqueue *vq; | |
997 | struct port_buffer *buf; | |
998 | unsigned int len; | |
999 | ||
1000 | portdev = container_of(work, struct ports_device, control_work); | |
1001 | vq = portdev->c_ivq; | |
1002 | ||
1003 | spin_lock(&portdev->cvq_lock); | |
1004 | while ((buf = vq->vq_ops->get_buf(vq, &len))) { | |
1005 | spin_unlock(&portdev->cvq_lock); | |
1006 | ||
1007 | buf->len = len; | |
1008 | buf->offset = 0; | |
1009 | ||
1010 | handle_control_message(portdev, buf); | |
1011 | ||
1012 | spin_lock(&portdev->cvq_lock); | |
1013 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
1014 | dev_warn(&portdev->vdev->dev, | |
1015 | "Error adding buffer to queue\n"); | |
1016 | free_buf(buf); | |
1017 | } | |
1018 | } | |
1019 | spin_unlock(&portdev->cvq_lock); | |
1020 | } | |
1021 | ||
1022 | static void in_intr(struct virtqueue *vq) | |
1023 | { | |
1024 | struct port *port; | |
1025 | unsigned long flags; | |
1026 | ||
1027 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1028 | if (!port) | |
1029 | return; | |
1030 | ||
1031 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d6933561 AS |
1032 | if (!port->inbuf) |
1033 | port->inbuf = get_inbuf(port); | |
17634ba2 | 1034 | |
88f251ac AS |
1035 | /* |
1036 | * Don't queue up data when port is closed. This condition | |
1037 | * can be reached when a console port is not yet connected (no | |
1038 | * tty is spawned) and the host sends out data to console | |
1039 | * ports. For generic serial ports, the host won't | |
1040 | * (shouldn't) send data till the guest is connected. | |
1041 | */ | |
1042 | if (!port->guest_connected) | |
1043 | discard_port_data(port); | |
1044 | ||
17634ba2 AS |
1045 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1046 | ||
2030fa49 AS |
1047 | wake_up_interruptible(&port->waitqueue); |
1048 | ||
17634ba2 AS |
1049 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1050 | hvc_kick(); | |
1051 | } | |
1052 | ||
1053 | static void control_intr(struct virtqueue *vq) | |
1054 | { | |
1055 | struct ports_device *portdev; | |
1056 | ||
1057 | portdev = vq->vdev->priv; | |
1058 | schedule_work(&portdev->control_work); | |
1059 | } | |
1060 | ||
7f5d810d AS |
1061 | static void config_intr(struct virtio_device *vdev) |
1062 | { | |
1063 | struct ports_device *portdev; | |
1064 | ||
1065 | portdev = vdev->priv; | |
1066 | if (use_multiport(portdev)) { | |
1067 | /* Handle port hot-add */ | |
1068 | schedule_work(&portdev->config_work); | |
1069 | } | |
1070 | /* | |
1071 | * We'll use this way of resizing only for legacy support. | |
1072 | * For newer userspace (VIRTIO_CONSOLE_F_MULTPORT+), use | |
1073 | * control messages to indicate console size changes so that | |
1074 | * it can be done per-port | |
1075 | */ | |
1076 | resize_console(find_port_by_id(portdev, 0)); | |
1077 | } | |
1078 | ||
22a29eac | 1079 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
17634ba2 AS |
1080 | { |
1081 | struct port_buffer *buf; | |
335a64a5 AS |
1082 | unsigned int nr_added_bufs; |
1083 | int ret; | |
17634ba2 | 1084 | |
335a64a5 | 1085 | nr_added_bufs = 0; |
17634ba2 AS |
1086 | do { |
1087 | buf = alloc_buf(PAGE_SIZE); | |
1088 | if (!buf) | |
1089 | break; | |
1090 | ||
1091 | spin_lock_irq(lock); | |
335a64a5 AS |
1092 | ret = add_inbuf(vq, buf); |
1093 | if (ret < 0) { | |
17634ba2 AS |
1094 | spin_unlock_irq(lock); |
1095 | free_buf(buf); | |
1096 | break; | |
1097 | } | |
335a64a5 | 1098 | nr_added_bufs++; |
17634ba2 | 1099 | spin_unlock_irq(lock); |
335a64a5 | 1100 | } while (ret > 0); |
22a29eac | 1101 | |
335a64a5 | 1102 | return nr_added_bufs; |
17634ba2 AS |
1103 | } |
1104 | ||
1105 | static int add_port(struct ports_device *portdev, u32 id) | |
d8a02bd5 | 1106 | { |
d99393ef | 1107 | char debugfs_name[16]; |
21206ede | 1108 | struct port *port; |
d6933561 | 1109 | struct port_buffer *buf; |
fb08bd27 | 1110 | dev_t devt; |
335a64a5 | 1111 | unsigned int nr_added_bufs; |
31610434 | 1112 | int err; |
31610434 | 1113 | |
1c85bf35 | 1114 | port = kmalloc(sizeof(*port), GFP_KERNEL); |
d8a02bd5 RR |
1115 | if (!port) { |
1116 | err = -ENOMEM; | |
1117 | goto fail; | |
f550804a | 1118 | } |
73954488 | 1119 | |
1c85bf35 | 1120 | port->portdev = portdev; |
17634ba2 | 1121 | port->id = id; |
203baab8 | 1122 | |
431edb8a | 1123 | port->name = NULL; |
203baab8 | 1124 | port->inbuf = NULL; |
17634ba2 | 1125 | port->cons.hvc = NULL; |
203baab8 | 1126 | |
3c7969cc | 1127 | port->host_connected = port->guest_connected = false; |
2030fa49 | 1128 | |
17634ba2 AS |
1129 | port->in_vq = portdev->in_vqs[port->id]; |
1130 | port->out_vq = portdev->out_vqs[port->id]; | |
31610434 | 1131 | |
2030fa49 | 1132 | cdev_init(&port->cdev, &port_fops); |
fb08bd27 AS |
1133 | |
1134 | devt = MKDEV(portdev->chr_major, id); | |
1135 | err = cdev_add(&port->cdev, devt, 1); | |
1136 | if (err < 0) { | |
1137 | dev_err(&port->portdev->vdev->dev, | |
1138 | "Error %d adding cdev for port %u\n", err, id); | |
1139 | goto free_port; | |
1140 | } | |
1141 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1142 | devt, port, "vport%up%u", | |
1143 | port->portdev->drv_index, id); | |
1144 | if (IS_ERR(port->dev)) { | |
1145 | err = PTR_ERR(port->dev); | |
1146 | dev_err(&port->portdev->vdev->dev, | |
1147 | "Error %d creating device for port %u\n", | |
1148 | err, id); | |
1149 | goto free_cdev; | |
1150 | } | |
1151 | ||
203baab8 | 1152 | spin_lock_init(&port->inbuf_lock); |
2030fa49 | 1153 | init_waitqueue_head(&port->waitqueue); |
203baab8 | 1154 | |
d6933561 | 1155 | /* Fill the in_vq with buffers so the host can send us data. */ |
335a64a5 AS |
1156 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); |
1157 | if (!nr_added_bufs) { | |
d6933561 | 1158 | dev_err(port->dev, "Error allocating inbufs\n"); |
1c85bf35 | 1159 | err = -ENOMEM; |
fb08bd27 | 1160 | goto free_device; |
1c85bf35 | 1161 | } |
31610434 | 1162 | |
17634ba2 AS |
1163 | /* |
1164 | * If we're not using multiport support, this has to be a console port | |
1165 | */ | |
1166 | if (!use_multiport(port->portdev)) { | |
1167 | err = init_port_console(port); | |
1168 | if (err) | |
d6933561 | 1169 | goto free_inbufs; |
17634ba2 AS |
1170 | } |
1171 | ||
1172 | spin_lock_irq(&portdev->ports_lock); | |
1173 | list_add_tail(&port->list, &port->portdev->ports); | |
1174 | spin_unlock_irq(&portdev->ports_lock); | |
1175 | ||
1176 | /* | |
1177 | * Tell the Host we're set so that it can send us various | |
1178 | * configuration parameters for this port (eg, port name, | |
1179 | * caching, whether this is a console port, etc.) | |
1180 | */ | |
1181 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
38edf58d | 1182 | |
d99393ef AS |
1183 | if (pdrvdata.debugfs_dir) { |
1184 | /* | |
1185 | * Finally, create the debugfs file that we can use to | |
1186 | * inspect a port's state at any time | |
1187 | */ | |
1188 | sprintf(debugfs_name, "vport%up%u", | |
1189 | port->portdev->drv_index, id); | |
1190 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, | |
1191 | pdrvdata.debugfs_dir, | |
1192 | port, | |
1193 | &port_debugfs_ops); | |
1194 | } | |
1c85bf35 AS |
1195 | return 0; |
1196 | ||
d6933561 AS |
1197 | free_inbufs: |
1198 | while ((buf = port->in_vq->vq_ops->detach_unused_buf(port->in_vq))) | |
1199 | free_buf(buf); | |
fb08bd27 AS |
1200 | free_device: |
1201 | device_destroy(pdrvdata.class, port->dev->devt); | |
1202 | free_cdev: | |
1203 | cdev_del(&port->cdev); | |
1c85bf35 AS |
1204 | free_port: |
1205 | kfree(port); | |
1206 | fail: | |
1207 | return err; | |
1208 | } | |
1209 | ||
7f5d810d AS |
1210 | /* |
1211 | * The workhandler for config-space updates. | |
1212 | * | |
1213 | * This is called when ports are hot-added. | |
1214 | */ | |
1215 | static void config_work_handler(struct work_struct *work) | |
1216 | { | |
1217 | struct virtio_console_config virtconconf; | |
1218 | struct ports_device *portdev; | |
1219 | struct virtio_device *vdev; | |
1220 | int err; | |
1221 | ||
1222 | portdev = container_of(work, struct ports_device, config_work); | |
1223 | ||
1224 | vdev = portdev->vdev; | |
1225 | vdev->config->get(vdev, | |
1226 | offsetof(struct virtio_console_config, nr_ports), | |
1227 | &virtconconf.nr_ports, | |
1228 | sizeof(virtconconf.nr_ports)); | |
1229 | ||
1230 | if (portdev->config.nr_ports == virtconconf.nr_ports) { | |
1231 | /* | |
1232 | * Port 0 got hot-added. Since we already did all the | |
1233 | * other initialisation for it, just tell the Host | |
1f7aa42d AS |
1234 | * that the port is ready if we find the port. In |
1235 | * case the port was hot-removed earlier, we call | |
1236 | * add_port to add the port. | |
7f5d810d AS |
1237 | */ |
1238 | struct port *port; | |
1239 | ||
1240 | port = find_port_by_id(portdev, 0); | |
1f7aa42d AS |
1241 | if (!port) |
1242 | add_port(portdev, 0); | |
1243 | else | |
1244 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
7f5d810d AS |
1245 | return; |
1246 | } | |
1247 | if (virtconconf.nr_ports > portdev->config.max_nr_ports) { | |
1248 | dev_warn(&vdev->dev, | |
1249 | "More ports specified (%u) than allowed (%u)", | |
1250 | portdev->config.nr_ports + 1, | |
1251 | portdev->config.max_nr_ports); | |
1252 | return; | |
1253 | } | |
1254 | if (virtconconf.nr_ports < portdev->config.nr_ports) | |
1255 | return; | |
1256 | ||
1257 | /* Hot-add ports */ | |
1258 | while (virtconconf.nr_ports - portdev->config.nr_ports) { | |
1259 | err = add_port(portdev, portdev->config.nr_ports); | |
1260 | if (err) | |
1261 | break; | |
1262 | portdev->config.nr_ports++; | |
1263 | } | |
1264 | } | |
1265 | ||
2658a79a AS |
1266 | static int init_vqs(struct ports_device *portdev) |
1267 | { | |
1268 | vq_callback_t **io_callbacks; | |
1269 | char **io_names; | |
1270 | struct virtqueue **vqs; | |
17634ba2 | 1271 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1272 | int err; |
1273 | ||
17634ba2 AS |
1274 | nr_ports = portdev->config.max_nr_ports; |
1275 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1276 | |
1277 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
1278 | if (!vqs) { | |
1279 | err = -ENOMEM; | |
1280 | goto fail; | |
1281 | } | |
1282 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); | |
1283 | if (!io_callbacks) { | |
1284 | err = -ENOMEM; | |
1285 | goto free_vqs; | |
1286 | } | |
1287 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); | |
1288 | if (!io_names) { | |
1289 | err = -ENOMEM; | |
1290 | goto free_callbacks; | |
1291 | } | |
1292 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1293 | GFP_KERNEL); | |
1294 | if (!portdev->in_vqs) { | |
1295 | err = -ENOMEM; | |
1296 | goto free_names; | |
1297 | } | |
1298 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1299 | GFP_KERNEL); | |
1300 | if (!portdev->out_vqs) { | |
1301 | err = -ENOMEM; | |
1302 | goto free_invqs; | |
1303 | } | |
1304 | ||
17634ba2 AS |
1305 | /* |
1306 | * For backward compat (newer host but older guest), the host | |
1307 | * spawns a console port first and also inits the vqs for port | |
1308 | * 0 before others. | |
1309 | */ | |
1310 | j = 0; | |
1311 | io_callbacks[j] = in_intr; | |
1312 | io_callbacks[j + 1] = NULL; | |
1313 | io_names[j] = "input"; | |
1314 | io_names[j + 1] = "output"; | |
1315 | j += 2; | |
1316 | ||
1317 | if (use_multiport(portdev)) { | |
1318 | io_callbacks[j] = control_intr; | |
1319 | io_callbacks[j + 1] = NULL; | |
1320 | io_names[j] = "control-i"; | |
1321 | io_names[j + 1] = "control-o"; | |
1322 | ||
1323 | for (i = 1; i < nr_ports; i++) { | |
1324 | j += 2; | |
1325 | io_callbacks[j] = in_intr; | |
1326 | io_callbacks[j + 1] = NULL; | |
1327 | io_names[j] = "input"; | |
1328 | io_names[j + 1] = "output"; | |
1329 | } | |
1330 | } | |
2658a79a AS |
1331 | /* Find the queues. */ |
1332 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1333 | io_callbacks, | |
1334 | (const char **)io_names); | |
1335 | if (err) | |
1336 | goto free_outvqs; | |
1337 | ||
17634ba2 | 1338 | j = 0; |
2658a79a AS |
1339 | portdev->in_vqs[0] = vqs[0]; |
1340 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1341 | j += 2; |
1342 | if (use_multiport(portdev)) { | |
1343 | portdev->c_ivq = vqs[j]; | |
1344 | portdev->c_ovq = vqs[j + 1]; | |
1345 | ||
1346 | for (i = 1; i < nr_ports; i++) { | |
1347 | j += 2; | |
1348 | portdev->in_vqs[i] = vqs[j]; | |
1349 | portdev->out_vqs[i] = vqs[j + 1]; | |
1350 | } | |
1351 | } | |
2658a79a AS |
1352 | kfree(io_callbacks); |
1353 | kfree(io_names); | |
1354 | kfree(vqs); | |
1355 | ||
1356 | return 0; | |
1357 | ||
1358 | free_names: | |
1359 | kfree(io_names); | |
1360 | free_callbacks: | |
1361 | kfree(io_callbacks); | |
1362 | free_outvqs: | |
1363 | kfree(portdev->out_vqs); | |
1364 | free_invqs: | |
1365 | kfree(portdev->in_vqs); | |
1366 | free_vqs: | |
1367 | kfree(vqs); | |
1368 | fail: | |
1369 | return err; | |
1370 | } | |
1371 | ||
fb08bd27 AS |
1372 | static const struct file_operations portdev_fops = { |
1373 | .owner = THIS_MODULE, | |
1374 | }; | |
1375 | ||
1c85bf35 AS |
1376 | /* |
1377 | * Once we're further in boot, we get probed like any other virtio | |
1378 | * device. | |
17634ba2 AS |
1379 | * |
1380 | * If the host also supports multiple console ports, we check the | |
1381 | * config space to see how many ports the host has spawned. We | |
1382 | * initialize each port found. | |
1c85bf35 AS |
1383 | */ |
1384 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1385 | { | |
1c85bf35 | 1386 | struct ports_device *portdev; |
17634ba2 | 1387 | u32 i; |
1c85bf35 | 1388 | int err; |
17634ba2 | 1389 | bool multiport; |
1c85bf35 AS |
1390 | |
1391 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1392 | if (!portdev) { | |
1393 | err = -ENOMEM; | |
1394 | goto fail; | |
1395 | } | |
1396 | ||
1397 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1398 | portdev->vdev = vdev; | |
1399 | vdev->priv = portdev; | |
1400 | ||
fb08bd27 AS |
1401 | spin_lock_irq(&pdrvdata_lock); |
1402 | portdev->drv_index = pdrvdata.index++; | |
1403 | spin_unlock_irq(&pdrvdata_lock); | |
1404 | ||
1405 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1406 | &portdev_fops); | |
1407 | if (portdev->chr_major < 0) { | |
1408 | dev_err(&vdev->dev, | |
1409 | "Error %d registering chrdev for device %u\n", | |
1410 | portdev->chr_major, portdev->drv_index); | |
1411 | err = portdev->chr_major; | |
1412 | goto free; | |
1413 | } | |
1414 | ||
17634ba2 AS |
1415 | multiport = false; |
1416 | portdev->config.nr_ports = 1; | |
1417 | portdev->config.max_nr_ports = 1; | |
1418 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { | |
1419 | multiport = true; | |
1420 | vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; | |
1421 | ||
1422 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1423 | nr_ports), | |
1424 | &portdev->config.nr_ports, | |
1425 | sizeof(portdev->config.nr_ports)); | |
1426 | vdev->config->get(vdev, offsetof(struct virtio_console_config, | |
1427 | max_nr_ports), | |
1428 | &portdev->config.max_nr_ports, | |
1429 | sizeof(portdev->config.max_nr_ports)); | |
1430 | if (portdev->config.nr_ports > portdev->config.max_nr_ports) { | |
1431 | dev_warn(&vdev->dev, | |
1432 | "More ports (%u) specified than allowed (%u). Will init %u ports.", | |
1433 | portdev->config.nr_ports, | |
1434 | portdev->config.max_nr_ports, | |
1435 | portdev->config.max_nr_ports); | |
1436 | ||
1437 | portdev->config.nr_ports = portdev->config.max_nr_ports; | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | /* Let the Host know we support multiple ports.*/ | |
1442 | vdev->config->finalize_features(vdev); | |
1443 | ||
2658a79a AS |
1444 | err = init_vqs(portdev); |
1445 | if (err < 0) { | |
1446 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1447 | goto free_chrdev; |
2658a79a | 1448 | } |
1c85bf35 | 1449 | |
17634ba2 AS |
1450 | spin_lock_init(&portdev->ports_lock); |
1451 | INIT_LIST_HEAD(&portdev->ports); | |
1452 | ||
1453 | if (multiport) { | |
335a64a5 AS |
1454 | unsigned int nr_added_bufs; |
1455 | ||
17634ba2 AS |
1456 | spin_lock_init(&portdev->cvq_lock); |
1457 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
7f5d810d | 1458 | INIT_WORK(&portdev->config_work, &config_work_handler); |
17634ba2 | 1459 | |
335a64a5 AS |
1460 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
1461 | if (!nr_added_bufs) { | |
22a29eac AS |
1462 | dev_err(&vdev->dev, |
1463 | "Error allocating buffers for control queue\n"); | |
1464 | err = -ENOMEM; | |
1465 | goto free_vqs; | |
1466 | } | |
17634ba2 AS |
1467 | } |
1468 | ||
1469 | for (i = 0; i < portdev->config.nr_ports; i++) | |
1470 | add_port(portdev, i); | |
1c85bf35 | 1471 | |
971f3390 RR |
1472 | /* Start using the new console output. */ |
1473 | early_put_chars = NULL; | |
31610434 RR |
1474 | return 0; |
1475 | ||
22a29eac AS |
1476 | free_vqs: |
1477 | vdev->config->del_vqs(vdev); | |
1478 | kfree(portdev->in_vqs); | |
1479 | kfree(portdev->out_vqs); | |
fb08bd27 AS |
1480 | free_chrdev: |
1481 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1482 | free: |
1c85bf35 | 1483 | kfree(portdev); |
31610434 RR |
1484 | fail: |
1485 | return err; | |
1486 | } | |
1487 | ||
7177876f AS |
1488 | static void virtcons_remove(struct virtio_device *vdev) |
1489 | { | |
1490 | struct ports_device *portdev; | |
1491 | struct port *port, *port2; | |
1492 | struct port_buffer *buf; | |
1493 | unsigned int len; | |
1494 | ||
1495 | portdev = vdev->priv; | |
1496 | ||
1497 | cancel_work_sync(&portdev->control_work); | |
1498 | cancel_work_sync(&portdev->config_work); | |
1499 | ||
1500 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
1501 | remove_port(port); | |
1502 | ||
1503 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
1504 | ||
1505 | while ((buf = portdev->c_ivq->vq_ops->get_buf(portdev->c_ivq, &len))) | |
1506 | free_buf(buf); | |
1507 | ||
1508 | while ((buf = portdev->c_ivq->vq_ops->detach_unused_buf(portdev->c_ivq))) | |
1509 | free_buf(buf); | |
1510 | ||
1511 | vdev->config->del_vqs(vdev); | |
1512 | kfree(portdev->in_vqs); | |
1513 | kfree(portdev->out_vqs); | |
1514 | ||
1515 | kfree(portdev); | |
1516 | } | |
1517 | ||
31610434 RR |
1518 | static struct virtio_device_id id_table[] = { |
1519 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1520 | { 0 }, | |
1521 | }; | |
1522 | ||
c2983458 CB |
1523 | static unsigned int features[] = { |
1524 | VIRTIO_CONSOLE_F_SIZE, | |
17634ba2 | 1525 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1526 | }; |
1527 | ||
31610434 | 1528 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1529 | .feature_table = features, |
1530 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1531 | .driver.name = KBUILD_MODNAME, |
1532 | .driver.owner = THIS_MODULE, | |
1533 | .id_table = id_table, | |
1534 | .probe = virtcons_probe, | |
7177876f | 1535 | .remove = virtcons_remove, |
7f5d810d | 1536 | .config_changed = config_intr, |
31610434 RR |
1537 | }; |
1538 | ||
1539 | static int __init init(void) | |
1540 | { | |
fb08bd27 AS |
1541 | int err; |
1542 | ||
1543 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
1544 | if (IS_ERR(pdrvdata.class)) { | |
1545 | err = PTR_ERR(pdrvdata.class); | |
1546 | pr_err("Error %d creating virtio-ports class\n", err); | |
1547 | return err; | |
1548 | } | |
d99393ef AS |
1549 | |
1550 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
1551 | if (!pdrvdata.debugfs_dir) { | |
1552 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
1553 | PTR_ERR(pdrvdata.debugfs_dir)); | |
1554 | } | |
38edf58d AS |
1555 | INIT_LIST_HEAD(&pdrvdata.consoles); |
1556 | ||
31610434 RR |
1557 | return register_virtio_driver(&virtio_console); |
1558 | } | |
7177876f AS |
1559 | |
1560 | static void __exit fini(void) | |
1561 | { | |
1562 | unregister_virtio_driver(&virtio_console); | |
1563 | ||
1564 | class_destroy(pdrvdata.class); | |
1565 | if (pdrvdata.debugfs_dir) | |
1566 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
1567 | } | |
31610434 | 1568 | module_init(init); |
7177876f | 1569 | module_exit(fini); |
31610434 RR |
1570 | |
1571 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1572 | MODULE_DESCRIPTION("Virtio console driver"); | |
1573 | MODULE_LICENSE("GPL"); |