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Commit | Line | Data |
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a23ea924 RR |
1 | /* |
2 | * Copyright (C) 2006, 2007, 2009 Rusty Russell, IBM Corporation | |
17634ba2 | 3 | * Copyright (C) 2009, 2010 Red Hat, Inc. |
31610434 RR |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
fb08bd27 | 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; | |
113 | ||
114 | struct list_head ports; | |
115 | ||
116 | /* To protect the list of ports */ | |
117 | spinlock_t ports_lock; | |
118 | ||
119 | /* To protect the vq operations for the control channel */ | |
120 | spinlock_t cvq_lock; | |
121 | ||
122 | /* The current config space is stored here */ | |
b99fa815 | 123 | struct virtio_console_config config; |
17634ba2 AS |
124 | |
125 | /* The virtio device we're associated with */ | |
126 | struct virtio_device *vdev; | |
127 | ||
128 | /* | |
129 | * A couple of virtqueues for the control channel: one for | |
130 | * guest->host transfers, one for host->guest transfers | |
131 | */ | |
132 | struct virtqueue *c_ivq, *c_ovq; | |
133 | ||
134 | /* Array of per-port IO virtqueues */ | |
135 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
136 | |
137 | /* Used for numbering devices for sysfs and debugfs */ | |
138 | unsigned int drv_index; | |
139 | ||
140 | /* Major number for this device. Ports will be created as minors. */ | |
141 | int chr_major; | |
17634ba2 AS |
142 | }; |
143 | ||
1c85bf35 | 144 | /* This struct holds the per-port data */ |
21206ede | 145 | struct port { |
17634ba2 AS |
146 | /* Next port in the list, head is in the ports_device */ |
147 | struct list_head list; | |
148 | ||
1c85bf35 AS |
149 | /* Pointer to the parent virtio_console device */ |
150 | struct ports_device *portdev; | |
fdb9a054 AS |
151 | |
152 | /* The current buffer from which data has to be fed to readers */ | |
153 | struct port_buffer *inbuf; | |
21206ede | 154 | |
203baab8 AS |
155 | /* |
156 | * To protect the operations on the in_vq associated with this | |
157 | * port. Has to be a spinlock because it can be called from | |
158 | * interrupt context (get_char()). | |
159 | */ | |
160 | spinlock_t inbuf_lock; | |
161 | ||
1c85bf35 AS |
162 | /* The IO vqs for this port */ |
163 | struct virtqueue *in_vq, *out_vq; | |
164 | ||
d99393ef AS |
165 | /* File in the debugfs directory that exposes this port's information */ |
166 | struct dentry *debugfs_file; | |
167 | ||
4f23c573 AS |
168 | /* |
169 | * The entries in this struct will be valid if this port is | |
170 | * hooked up to an hvc console | |
171 | */ | |
172 | struct console cons; | |
17634ba2 | 173 | |
fb08bd27 AS |
174 | /* Each port associates with a separate char device */ |
175 | struct cdev cdev; | |
176 | struct device *dev; | |
177 | ||
2030fa49 AS |
178 | /* A waitqueue for poll() or blocking read operations */ |
179 | wait_queue_head_t waitqueue; | |
180 | ||
431edb8a AS |
181 | /* The 'name' of the port that we expose via sysfs properties */ |
182 | char *name; | |
183 | ||
17634ba2 AS |
184 | /* The 'id' to identify the port with the Host */ |
185 | u32 id; | |
2030fa49 AS |
186 | |
187 | /* Is the host device open */ | |
188 | bool host_connected; | |
3c7969cc AS |
189 | |
190 | /* We should allow only one process to open a port */ | |
191 | bool guest_connected; | |
21206ede | 192 | }; |
31610434 | 193 | |
971f3390 RR |
194 | /* This is the very early arch-specified put chars function. */ |
195 | static int (*early_put_chars)(u32, const char *, int); | |
196 | ||
38edf58d AS |
197 | static struct port *find_port_by_vtermno(u32 vtermno) |
198 | { | |
199 | struct port *port; | |
4f23c573 | 200 | struct console *cons; |
38edf58d AS |
201 | unsigned long flags; |
202 | ||
203 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
204 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
205 | if (cons->vtermno == vtermno) { | |
206 | port = container_of(cons, struct port, cons); | |
38edf58d | 207 | goto out; |
4f23c573 | 208 | } |
38edf58d AS |
209 | } |
210 | port = NULL; | |
211 | out: | |
212 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
213 | return port; | |
214 | } | |
215 | ||
17634ba2 AS |
216 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
217 | { | |
218 | struct port *port; | |
219 | unsigned long flags; | |
220 | ||
221 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
222 | list_for_each_entry(port, &portdev->ports, list) | |
223 | if (port->id == id) | |
224 | goto out; | |
225 | port = NULL; | |
226 | out: | |
227 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
228 | ||
229 | return port; | |
230 | } | |
231 | ||
203baab8 AS |
232 | static struct port *find_port_by_vq(struct ports_device *portdev, |
233 | struct virtqueue *vq) | |
234 | { | |
235 | struct port *port; | |
203baab8 AS |
236 | unsigned long flags; |
237 | ||
17634ba2 AS |
238 | spin_lock_irqsave(&portdev->ports_lock, flags); |
239 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
240 | if (port->in_vq == vq || port->out_vq == vq) |
241 | goto out; | |
203baab8 AS |
242 | port = NULL; |
243 | out: | |
17634ba2 | 244 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
245 | return port; |
246 | } | |
247 | ||
17634ba2 AS |
248 | static bool is_console_port(struct port *port) |
249 | { | |
250 | if (port->cons.hvc) | |
251 | return true; | |
252 | return false; | |
253 | } | |
254 | ||
255 | static inline bool use_multiport(struct ports_device *portdev) | |
256 | { | |
257 | /* | |
258 | * This condition can be true when put_chars is called from | |
259 | * early_init | |
260 | */ | |
261 | if (!portdev->vdev) | |
262 | return 0; | |
263 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
264 | } | |
265 | ||
fdb9a054 AS |
266 | static void free_buf(struct port_buffer *buf) |
267 | { | |
268 | kfree(buf->buf); | |
269 | kfree(buf); | |
270 | } | |
271 | ||
272 | static struct port_buffer *alloc_buf(size_t buf_size) | |
273 | { | |
274 | struct port_buffer *buf; | |
275 | ||
276 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
277 | if (!buf) | |
278 | goto fail; | |
279 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
280 | if (!buf->buf) | |
281 | goto free_buf; | |
282 | buf->len = 0; | |
283 | buf->offset = 0; | |
284 | buf->size = buf_size; | |
285 | return buf; | |
286 | ||
287 | free_buf: | |
288 | kfree(buf); | |
289 | fail: | |
290 | return NULL; | |
291 | } | |
292 | ||
a3cde449 AS |
293 | /* Callers should take appropriate locks */ |
294 | static void *get_inbuf(struct port *port) | |
295 | { | |
296 | struct port_buffer *buf; | |
297 | struct virtqueue *vq; | |
298 | unsigned int len; | |
299 | ||
300 | vq = port->in_vq; | |
505b0451 | 301 | buf = virtqueue_get_buf(vq, &len); |
a3cde449 AS |
302 | if (buf) { |
303 | buf->len = len; | |
304 | buf->offset = 0; | |
305 | } | |
306 | return buf; | |
307 | } | |
308 | ||
e27b5198 AS |
309 | /* |
310 | * Create a scatter-gather list representing our input buffer and put | |
311 | * it in the queue. | |
312 | * | |
313 | * Callers should take appropriate locks. | |
314 | */ | |
203baab8 | 315 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
316 | { |
317 | struct scatterlist sg[1]; | |
203baab8 | 318 | int ret; |
1c85bf35 | 319 | |
e27b5198 AS |
320 | sg_init_one(sg, buf->buf, buf->size); |
321 | ||
505b0451 MT |
322 | ret = virtqueue_add_buf(vq, sg, 0, 1, buf); |
323 | virtqueue_kick(vq); | |
203baab8 AS |
324 | return ret; |
325 | } | |
326 | ||
88f251ac AS |
327 | /* Discard any unread data this port has. Callers lockers. */ |
328 | static void discard_port_data(struct port *port) | |
329 | { | |
330 | struct port_buffer *buf; | |
331 | struct virtqueue *vq; | |
332 | unsigned int len; | |
d6933561 | 333 | int ret; |
88f251ac AS |
334 | |
335 | vq = port->in_vq; | |
336 | if (port->inbuf) | |
337 | buf = port->inbuf; | |
338 | else | |
505b0451 | 339 | buf = virtqueue_get_buf(vq, &len); |
88f251ac | 340 | |
d6933561 AS |
341 | ret = 0; |
342 | while (buf) { | |
343 | if (add_inbuf(vq, buf) < 0) { | |
344 | ret++; | |
345 | free_buf(buf); | |
346 | } | |
505b0451 | 347 | buf = virtqueue_get_buf(vq, &len); |
88f251ac | 348 | } |
88f251ac | 349 | port->inbuf = NULL; |
d6933561 AS |
350 | if (ret) |
351 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", | |
352 | ret); | |
88f251ac AS |
353 | } |
354 | ||
203baab8 AS |
355 | static bool port_has_data(struct port *port) |
356 | { | |
357 | unsigned long flags; | |
358 | bool ret; | |
359 | ||
203baab8 | 360 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 361 | if (port->inbuf) { |
203baab8 | 362 | ret = true; |
d6933561 AS |
363 | goto out; |
364 | } | |
365 | port->inbuf = get_inbuf(port); | |
366 | if (port->inbuf) { | |
367 | ret = true; | |
368 | goto out; | |
369 | } | |
370 | ret = false; | |
371 | out: | |
203baab8 | 372 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
373 | return ret; |
374 | } | |
375 | ||
3425e706 AS |
376 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
377 | unsigned int event, unsigned int value) | |
17634ba2 AS |
378 | { |
379 | struct scatterlist sg[1]; | |
380 | struct virtio_console_control cpkt; | |
381 | struct virtqueue *vq; | |
604b2ad7 | 382 | unsigned int len; |
17634ba2 | 383 | |
3425e706 | 384 | if (!use_multiport(portdev)) |
17634ba2 AS |
385 | return 0; |
386 | ||
3425e706 | 387 | cpkt.id = port_id; |
17634ba2 AS |
388 | cpkt.event = event; |
389 | cpkt.value = value; | |
390 | ||
3425e706 | 391 | vq = portdev->c_ovq; |
17634ba2 AS |
392 | |
393 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
505b0451 MT |
394 | if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt) >= 0) { |
395 | virtqueue_kick(vq); | |
396 | while (!virtqueue_get_buf(vq, &len)) | |
17634ba2 AS |
397 | cpu_relax(); |
398 | } | |
399 | return 0; | |
400 | } | |
401 | ||
3425e706 AS |
402 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
403 | unsigned int value) | |
404 | { | |
405 | return __send_control_msg(port->portdev, port->id, event, value); | |
406 | } | |
407 | ||
f997f00b AS |
408 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count) |
409 | { | |
410 | struct scatterlist sg[1]; | |
411 | struct virtqueue *out_vq; | |
412 | ssize_t ret; | |
413 | unsigned int len; | |
414 | ||
415 | out_vq = port->out_vq; | |
416 | ||
417 | sg_init_one(sg, in_buf, in_count); | |
505b0451 | 418 | ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf); |
f997f00b AS |
419 | |
420 | /* Tell Host to go! */ | |
505b0451 | 421 | virtqueue_kick(out_vq); |
f997f00b AS |
422 | |
423 | if (ret < 0) { | |
9ff4cfab | 424 | in_count = 0; |
f997f00b AS |
425 | goto fail; |
426 | } | |
427 | ||
9ff4cfab | 428 | /* Wait till the host acknowledges it pushed out the data we sent. */ |
505b0451 | 429 | while (!virtqueue_get_buf(out_vq, &len)) |
f997f00b AS |
430 | cpu_relax(); |
431 | fail: | |
432 | /* We're expected to return the amount of data we wrote */ | |
9ff4cfab | 433 | return in_count; |
f997f00b AS |
434 | } |
435 | ||
203baab8 AS |
436 | /* |
437 | * Give out the data that's requested from the buffer that we have | |
438 | * queued up. | |
439 | */ | |
b766ceed AS |
440 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
441 | bool to_user) | |
203baab8 AS |
442 | { |
443 | struct port_buffer *buf; | |
444 | unsigned long flags; | |
445 | ||
446 | if (!out_count || !port_has_data(port)) | |
447 | return 0; | |
448 | ||
449 | buf = port->inbuf; | |
b766ceed | 450 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 451 | |
b766ceed AS |
452 | if (to_user) { |
453 | ssize_t ret; | |
454 | ||
455 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
456 | if (ret) | |
457 | return -EFAULT; | |
458 | } else { | |
459 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
460 | } | |
203baab8 | 461 | |
203baab8 AS |
462 | buf->offset += out_count; |
463 | ||
464 | if (buf->offset == buf->len) { | |
465 | /* | |
466 | * We're done using all the data in this buffer. | |
467 | * Re-queue so that the Host can send us more data. | |
468 | */ | |
469 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
470 | port->inbuf = NULL; | |
471 | ||
472 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 473 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
474 | |
475 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
476 | } | |
b766ceed | 477 | /* Return the number of bytes actually copied */ |
203baab8 | 478 | return out_count; |
e27b5198 AS |
479 | } |
480 | ||
2030fa49 AS |
481 | /* The condition that must be true for polling to end */ |
482 | static bool wait_is_over(struct port *port) | |
483 | { | |
484 | return port_has_data(port) || !port->host_connected; | |
485 | } | |
486 | ||
487 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, | |
488 | size_t count, loff_t *offp) | |
489 | { | |
490 | struct port *port; | |
491 | ssize_t ret; | |
492 | ||
493 | port = filp->private_data; | |
494 | ||
495 | if (!port_has_data(port)) { | |
496 | /* | |
497 | * If nothing's connected on the host just return 0 in | |
498 | * case of list_empty; this tells the userspace app | |
499 | * that there's no connection | |
500 | */ | |
501 | if (!port->host_connected) | |
502 | return 0; | |
503 | if (filp->f_flags & O_NONBLOCK) | |
504 | return -EAGAIN; | |
505 | ||
506 | ret = wait_event_interruptible(port->waitqueue, | |
507 | wait_is_over(port)); | |
508 | if (ret < 0) | |
509 | return ret; | |
510 | } | |
511 | /* | |
512 | * We could've received a disconnection message while we were | |
513 | * waiting for more data. | |
514 | * | |
515 | * This check is not clubbed in the if() statement above as we | |
516 | * might receive some data as well as the host could get | |
517 | * disconnected after we got woken up from our wait. So we | |
518 | * really want to give off whatever data we have and only then | |
519 | * check for host_connected. | |
520 | */ | |
521 | if (!port_has_data(port) && !port->host_connected) | |
522 | return 0; | |
523 | ||
524 | return fill_readbuf(port, ubuf, count, true); | |
525 | } | |
526 | ||
527 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
528 | size_t count, loff_t *offp) | |
529 | { | |
530 | struct port *port; | |
531 | char *buf; | |
532 | ssize_t ret; | |
533 | ||
534 | port = filp->private_data; | |
535 | ||
536 | count = min((size_t)(32 * 1024), count); | |
537 | ||
538 | buf = kmalloc(count, GFP_KERNEL); | |
539 | if (!buf) | |
540 | return -ENOMEM; | |
541 | ||
542 | ret = copy_from_user(buf, ubuf, count); | |
543 | if (ret) { | |
544 | ret = -EFAULT; | |
545 | goto free_buf; | |
546 | } | |
547 | ||
548 | ret = send_buf(port, buf, count); | |
549 | free_buf: | |
550 | kfree(buf); | |
551 | return ret; | |
552 | } | |
553 | ||
554 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
555 | { | |
556 | struct port *port; | |
557 | unsigned int ret; | |
558 | ||
559 | port = filp->private_data; | |
560 | poll_wait(filp, &port->waitqueue, wait); | |
561 | ||
562 | ret = 0; | |
563 | if (port->inbuf) | |
564 | ret |= POLLIN | POLLRDNORM; | |
565 | if (port->host_connected) | |
566 | ret |= POLLOUT; | |
567 | if (!port->host_connected) | |
568 | ret |= POLLHUP; | |
569 | ||
570 | return ret; | |
571 | } | |
572 | ||
573 | static int port_fops_release(struct inode *inode, struct file *filp) | |
574 | { | |
575 | struct port *port; | |
576 | ||
577 | port = filp->private_data; | |
578 | ||
579 | /* Notify host of port being closed */ | |
580 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
581 | ||
88f251ac | 582 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
583 | port->guest_connected = false; |
584 | ||
88f251ac AS |
585 | discard_port_data(port); |
586 | ||
587 | spin_unlock_irq(&port->inbuf_lock); | |
588 | ||
2030fa49 AS |
589 | return 0; |
590 | } | |
591 | ||
592 | static int port_fops_open(struct inode *inode, struct file *filp) | |
593 | { | |
594 | struct cdev *cdev = inode->i_cdev; | |
595 | struct port *port; | |
596 | ||
597 | port = container_of(cdev, struct port, cdev); | |
598 | filp->private_data = port; | |
599 | ||
600 | /* | |
601 | * Don't allow opening of console port devices -- that's done | |
602 | * via /dev/hvc | |
603 | */ | |
604 | if (is_console_port(port)) | |
605 | return -ENXIO; | |
606 | ||
3c7969cc AS |
607 | /* Allow only one process to open a particular port at a time */ |
608 | spin_lock_irq(&port->inbuf_lock); | |
609 | if (port->guest_connected) { | |
610 | spin_unlock_irq(&port->inbuf_lock); | |
611 | return -EMFILE; | |
612 | } | |
613 | ||
614 | port->guest_connected = true; | |
615 | spin_unlock_irq(&port->inbuf_lock); | |
616 | ||
2030fa49 AS |
617 | /* Notify host of port being opened */ |
618 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
623 | /* | |
624 | * The file operations that we support: programs in the guest can open | |
625 | * a console device, read from it, write to it, poll for data and | |
626 | * close it. The devices are at | |
627 | * /dev/vport<device number>p<port number> | |
628 | */ | |
629 | static const struct file_operations port_fops = { | |
630 | .owner = THIS_MODULE, | |
631 | .open = port_fops_open, | |
632 | .read = port_fops_read, | |
633 | .write = port_fops_write, | |
634 | .poll = port_fops_poll, | |
635 | .release = port_fops_release, | |
636 | }; | |
637 | ||
a23ea924 RR |
638 | /* |
639 | * The put_chars() callback is pretty straightforward. | |
31610434 | 640 | * |
a23ea924 RR |
641 | * We turn the characters into a scatter-gather list, add it to the |
642 | * output queue and then kick the Host. Then we sit here waiting for | |
643 | * it to finish: inefficient in theory, but in practice | |
644 | * implementations will do it immediately (lguest's Launcher does). | |
645 | */ | |
31610434 RR |
646 | static int put_chars(u32 vtermno, const char *buf, int count) |
647 | { | |
21206ede | 648 | struct port *port; |
38edf58d | 649 | |
162a689a FD |
650 | if (unlikely(early_put_chars)) |
651 | return early_put_chars(vtermno, buf, count); | |
652 | ||
38edf58d AS |
653 | port = find_port_by_vtermno(vtermno); |
654 | if (!port) | |
6dc69f97 | 655 | return -EPIPE; |
31610434 | 656 | |
f997f00b | 657 | return send_buf(port, (void *)buf, count); |
31610434 RR |
658 | } |
659 | ||
a23ea924 RR |
660 | /* |
661 | * get_chars() is the callback from the hvc_console infrastructure | |
662 | * when an interrupt is received. | |
31610434 | 663 | * |
203baab8 AS |
664 | * We call out to fill_readbuf that gets us the required data from the |
665 | * buffers that are queued up. | |
a23ea924 | 666 | */ |
31610434 RR |
667 | static int get_chars(u32 vtermno, char *buf, int count) |
668 | { | |
21206ede RR |
669 | struct port *port; |
670 | ||
6dc69f97 AS |
671 | /* If we've not set up the port yet, we have no input to give. */ |
672 | if (unlikely(early_put_chars)) | |
673 | return 0; | |
674 | ||
38edf58d AS |
675 | port = find_port_by_vtermno(vtermno); |
676 | if (!port) | |
6dc69f97 | 677 | return -EPIPE; |
21206ede | 678 | |
31610434 | 679 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 680 | BUG_ON(!port->in_vq); |
31610434 | 681 | |
b766ceed | 682 | return fill_readbuf(port, buf, count, false); |
31610434 | 683 | } |
31610434 | 684 | |
cb06e367 | 685 | static void resize_console(struct port *port) |
c2983458 | 686 | { |
cb06e367 | 687 | struct virtio_device *vdev; |
c2983458 CB |
688 | struct winsize ws; |
689 | ||
2de16a49 AS |
690 | /* The port could have been hot-unplugged */ |
691 | if (!port) | |
692 | return; | |
693 | ||
cb06e367 AS |
694 | vdev = port->portdev->vdev; |
695 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) { | |
696 | vdev->config->get(vdev, | |
697 | offsetof(struct virtio_console_config, cols), | |
698 | &ws.ws_col, sizeof(u16)); | |
699 | vdev->config->get(vdev, | |
700 | offsetof(struct virtio_console_config, rows), | |
701 | &ws.ws_row, sizeof(u16)); | |
4f23c573 | 702 | hvc_resize(port->cons.hvc, ws); |
c2983458 CB |
703 | } |
704 | } | |
705 | ||
38edf58d | 706 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
707 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
708 | { | |
38edf58d AS |
709 | struct port *port; |
710 | ||
711 | port = find_port_by_vtermno(hp->vtermno); | |
712 | if (!port) | |
713 | return -EINVAL; | |
714 | ||
91fcad19 | 715 | hp->irq_requested = 1; |
cb06e367 | 716 | resize_console(port); |
c2983458 | 717 | |
91fcad19 CB |
718 | return 0; |
719 | } | |
720 | ||
721 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
722 | { | |
723 | hp->irq_requested = 0; | |
724 | } | |
725 | ||
17634ba2 | 726 | /* The operations for console ports. */ |
1dff3996 | 727 | static const struct hv_ops hv_ops = { |
971f3390 RR |
728 | .get_chars = get_chars, |
729 | .put_chars = put_chars, | |
730 | .notifier_add = notifier_add_vio, | |
731 | .notifier_del = notifier_del_vio, | |
732 | .notifier_hangup = notifier_del_vio, | |
733 | }; | |
734 | ||
735 | /* | |
736 | * Console drivers are initialized very early so boot messages can go | |
737 | * out, so we do things slightly differently from the generic virtio | |
738 | * initialization of the net and block drivers. | |
739 | * | |
740 | * At this stage, the console is output-only. It's too early to set | |
741 | * up a virtqueue, so we let the drivers do some boutique early-output | |
742 | * thing. | |
743 | */ | |
744 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
745 | { | |
746 | early_put_chars = put_chars; | |
747 | return hvc_instantiate(0, 0, &hv_ops); | |
748 | } | |
749 | ||
17634ba2 | 750 | int init_port_console(struct port *port) |
cfa6d379 AS |
751 | { |
752 | int ret; | |
753 | ||
754 | /* | |
755 | * The Host's telling us this port is a console port. Hook it | |
756 | * up with an hvc console. | |
757 | * | |
758 | * To set up and manage our virtual console, we call | |
759 | * hvc_alloc(). | |
760 | * | |
761 | * The first argument of hvc_alloc() is the virtual console | |
762 | * number. The second argument is the parameter for the | |
763 | * notification mechanism (like irq number). We currently | |
764 | * leave this as zero, virtqueues have implicit notifications. | |
765 | * | |
766 | * The third argument is a "struct hv_ops" containing the | |
767 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
768 | * pointers. The final argument is the output buffer size: we | |
769 | * can do any size, so we put PAGE_SIZE here. | |
770 | */ | |
771 | port->cons.vtermno = pdrvdata.next_vtermno; | |
772 | ||
773 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
774 | if (IS_ERR(port->cons.hvc)) { | |
775 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
776 | dev_err(port->dev, |
777 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
778 | port->cons.hvc = NULL; |
779 | return ret; | |
780 | } | |
781 | spin_lock_irq(&pdrvdata_lock); | |
782 | pdrvdata.next_vtermno++; | |
783 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
784 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 785 | port->guest_connected = true; |
cfa6d379 | 786 | |
2030fa49 AS |
787 | /* Notify host of port being opened */ |
788 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
789 | ||
cfa6d379 AS |
790 | return 0; |
791 | } | |
792 | ||
431edb8a AS |
793 | static ssize_t show_port_name(struct device *dev, |
794 | struct device_attribute *attr, char *buffer) | |
795 | { | |
796 | struct port *port; | |
797 | ||
798 | port = dev_get_drvdata(dev); | |
799 | ||
800 | return sprintf(buffer, "%s\n", port->name); | |
801 | } | |
802 | ||
803 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
804 | ||
805 | static struct attribute *port_sysfs_entries[] = { | |
806 | &dev_attr_name.attr, | |
807 | NULL | |
808 | }; | |
809 | ||
810 | static struct attribute_group port_attribute_group = { | |
811 | .name = NULL, /* put in device directory */ | |
812 | .attrs = port_sysfs_entries, | |
813 | }; | |
814 | ||
d99393ef AS |
815 | static int debugfs_open(struct inode *inode, struct file *filp) |
816 | { | |
817 | filp->private_data = inode->i_private; | |
818 | return 0; | |
819 | } | |
820 | ||
821 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, | |
822 | size_t count, loff_t *offp) | |
823 | { | |
824 | struct port *port; | |
825 | char *buf; | |
826 | ssize_t ret, out_offset, out_count; | |
827 | ||
828 | out_count = 1024; | |
829 | buf = kmalloc(out_count, GFP_KERNEL); | |
830 | if (!buf) | |
831 | return -ENOMEM; | |
832 | ||
833 | port = filp->private_data; | |
834 | out_offset = 0; | |
835 | out_offset += snprintf(buf + out_offset, out_count, | |
836 | "name: %s\n", port->name ? port->name : ""); | |
837 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
838 | "guest_connected: %d\n", port->guest_connected); | |
839 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
840 | "host_connected: %d\n", port->host_connected); | |
841 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
842 | "is_console: %s\n", | |
843 | is_console_port(port) ? "yes" : "no"); | |
844 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
845 | "console_vtermno: %u\n", port->cons.vtermno); | |
846 | ||
847 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
848 | kfree(buf); | |
849 | return ret; | |
850 | } | |
851 | ||
852 | static const struct file_operations port_debugfs_ops = { | |
853 | .owner = THIS_MODULE, | |
854 | .open = debugfs_open, | |
855 | .read = debugfs_read, | |
856 | }; | |
857 | ||
c446f8fc AS |
858 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
859 | { | |
860 | struct port_buffer *buf; | |
861 | unsigned int nr_added_bufs; | |
862 | int ret; | |
863 | ||
864 | nr_added_bufs = 0; | |
865 | do { | |
866 | buf = alloc_buf(PAGE_SIZE); | |
867 | if (!buf) | |
868 | break; | |
869 | ||
870 | spin_lock_irq(lock); | |
871 | ret = add_inbuf(vq, buf); | |
872 | if (ret < 0) { | |
873 | spin_unlock_irq(lock); | |
874 | free_buf(buf); | |
875 | break; | |
876 | } | |
877 | nr_added_bufs++; | |
878 | spin_unlock_irq(lock); | |
879 | } while (ret > 0); | |
880 | ||
881 | return nr_added_bufs; | |
882 | } | |
883 | ||
884 | static int add_port(struct ports_device *portdev, u32 id) | |
885 | { | |
886 | char debugfs_name[16]; | |
887 | struct port *port; | |
888 | struct port_buffer *buf; | |
889 | dev_t devt; | |
890 | unsigned int nr_added_bufs; | |
891 | int err; | |
892 | ||
893 | port = kmalloc(sizeof(*port), GFP_KERNEL); | |
894 | if (!port) { | |
895 | err = -ENOMEM; | |
896 | goto fail; | |
897 | } | |
898 | ||
899 | port->portdev = portdev; | |
900 | port->id = id; | |
901 | ||
902 | port->name = NULL; | |
903 | port->inbuf = NULL; | |
904 | port->cons.hvc = NULL; | |
905 | ||
906 | port->host_connected = port->guest_connected = false; | |
907 | ||
908 | port->in_vq = portdev->in_vqs[port->id]; | |
909 | port->out_vq = portdev->out_vqs[port->id]; | |
910 | ||
911 | cdev_init(&port->cdev, &port_fops); | |
912 | ||
913 | devt = MKDEV(portdev->chr_major, id); | |
914 | err = cdev_add(&port->cdev, devt, 1); | |
915 | if (err < 0) { | |
916 | dev_err(&port->portdev->vdev->dev, | |
917 | "Error %d adding cdev for port %u\n", err, id); | |
918 | goto free_port; | |
919 | } | |
920 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
921 | devt, port, "vport%up%u", | |
922 | port->portdev->drv_index, id); | |
923 | if (IS_ERR(port->dev)) { | |
924 | err = PTR_ERR(port->dev); | |
925 | dev_err(&port->portdev->vdev->dev, | |
926 | "Error %d creating device for port %u\n", | |
927 | err, id); | |
928 | goto free_cdev; | |
929 | } | |
930 | ||
931 | spin_lock_init(&port->inbuf_lock); | |
932 | init_waitqueue_head(&port->waitqueue); | |
933 | ||
934 | /* Fill the in_vq with buffers so the host can send us data. */ | |
935 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); | |
936 | if (!nr_added_bufs) { | |
937 | dev_err(port->dev, "Error allocating inbufs\n"); | |
938 | err = -ENOMEM; | |
939 | goto free_device; | |
940 | } | |
941 | ||
942 | /* | |
943 | * If we're not using multiport support, this has to be a console port | |
944 | */ | |
945 | if (!use_multiport(port->portdev)) { | |
946 | err = init_port_console(port); | |
947 | if (err) | |
948 | goto free_inbufs; | |
949 | } | |
950 | ||
951 | spin_lock_irq(&portdev->ports_lock); | |
952 | list_add_tail(&port->list, &port->portdev->ports); | |
953 | spin_unlock_irq(&portdev->ports_lock); | |
954 | ||
955 | /* | |
956 | * Tell the Host we're set so that it can send us various | |
957 | * configuration parameters for this port (eg, port name, | |
958 | * caching, whether this is a console port, etc.) | |
959 | */ | |
960 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
961 | ||
962 | if (pdrvdata.debugfs_dir) { | |
963 | /* | |
964 | * Finally, create the debugfs file that we can use to | |
965 | * inspect a port's state at any time | |
966 | */ | |
967 | sprintf(debugfs_name, "vport%up%u", | |
968 | port->portdev->drv_index, id); | |
969 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, | |
970 | pdrvdata.debugfs_dir, | |
971 | port, | |
972 | &port_debugfs_ops); | |
973 | } | |
974 | return 0; | |
975 | ||
976 | free_inbufs: | |
977 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
978 | free_buf(buf); | |
979 | free_device: | |
980 | device_destroy(pdrvdata.class, port->dev->devt); | |
981 | free_cdev: | |
982 | cdev_del(&port->cdev); | |
983 | free_port: | |
984 | kfree(port); | |
985 | fail: | |
986 | /* The host might want to notify management sw about port add failure */ | |
987 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 0); | |
988 | return err; | |
989 | } | |
990 | ||
1f7aa42d AS |
991 | /* Remove all port-specific data. */ |
992 | static int remove_port(struct port *port) | |
993 | { | |
a9cdd485 AS |
994 | struct port_buffer *buf; |
995 | ||
1f7aa42d AS |
996 | spin_lock_irq(&port->portdev->ports_lock); |
997 | list_del(&port->list); | |
998 | spin_unlock_irq(&port->portdev->ports_lock); | |
999 | ||
1000 | if (is_console_port(port)) { | |
1001 | spin_lock_irq(&pdrvdata_lock); | |
1002 | list_del(&port->cons.list); | |
1003 | spin_unlock_irq(&pdrvdata_lock); | |
69eb9a9f AS |
1004 | #if 0 |
1005 | /* | |
1006 | * hvc_remove() not called as removing one hvc port | |
1007 | * results in other hvc ports getting frozen. | |
1008 | * | |
1009 | * Once this is resolved in hvc, this functionality | |
1010 | * will be enabled. Till that is done, the -EPIPE | |
1011 | * return from get_chars() above will help | |
1012 | * hvc_console.c to clean up on ports we remove here. | |
1013 | */ | |
1f7aa42d | 1014 | hvc_remove(port->cons.hvc); |
69eb9a9f | 1015 | #endif |
1f7aa42d AS |
1016 | } |
1017 | if (port->guest_connected) | |
1018 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
1019 | ||
1f7aa42d AS |
1020 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); |
1021 | device_destroy(pdrvdata.class, port->dev->devt); | |
1022 | cdev_del(&port->cdev); | |
1023 | ||
a9cdd485 | 1024 | /* Remove unused data this port might have received. */ |
1f7aa42d | 1025 | discard_port_data(port); |
a9cdd485 AS |
1026 | |
1027 | /* Remove buffers we queued up for the Host to send us data in. */ | |
505b0451 | 1028 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) |
a9cdd485 AS |
1029 | free_buf(buf); |
1030 | ||
1f7aa42d AS |
1031 | kfree(port->name); |
1032 | ||
d99393ef AS |
1033 | debugfs_remove(port->debugfs_file); |
1034 | ||
1f7aa42d AS |
1035 | kfree(port); |
1036 | return 0; | |
1037 | } | |
1038 | ||
17634ba2 AS |
1039 | /* Any private messages that the Host and Guest want to share */ |
1040 | static void handle_control_message(struct ports_device *portdev, | |
1041 | struct port_buffer *buf) | |
1042 | { | |
1043 | struct virtio_console_control *cpkt; | |
1044 | struct port *port; | |
431edb8a AS |
1045 | size_t name_size; |
1046 | int err; | |
17634ba2 AS |
1047 | |
1048 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
1049 | ||
1050 | port = find_port_by_id(portdev, cpkt->id); | |
1051 | if (!port) { | |
1052 | /* No valid header at start of buffer. Drop it. */ | |
1053 | dev_dbg(&portdev->vdev->dev, | |
1054 | "Invalid index %u in control packet\n", cpkt->id); | |
1055 | return; | |
1056 | } | |
1057 | ||
1058 | switch (cpkt->event) { | |
1059 | case VIRTIO_CONSOLE_CONSOLE_PORT: | |
1060 | if (!cpkt->value) | |
1061 | break; | |
1062 | if (is_console_port(port)) | |
1063 | break; | |
1064 | ||
1065 | init_port_console(port); | |
1066 | /* | |
1067 | * Could remove the port here in case init fails - but | |
1068 | * have to notify the host first. | |
1069 | */ | |
1070 | break; | |
1071 | case VIRTIO_CONSOLE_RESIZE: | |
1072 | if (!is_console_port(port)) | |
1073 | break; | |
1074 | port->cons.hvc->irq_requested = 1; | |
1075 | resize_console(port); | |
1076 | break; | |
2030fa49 AS |
1077 | case VIRTIO_CONSOLE_PORT_OPEN: |
1078 | port->host_connected = cpkt->value; | |
1079 | wake_up_interruptible(&port->waitqueue); | |
1080 | break; | |
431edb8a AS |
1081 | case VIRTIO_CONSOLE_PORT_NAME: |
1082 | /* | |
1083 | * Skip the size of the header and the cpkt to get the size | |
1084 | * of the name that was sent | |
1085 | */ | |
1086 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
1087 | ||
1088 | port->name = kmalloc(name_size, GFP_KERNEL); | |
1089 | if (!port->name) { | |
1090 | dev_err(port->dev, | |
1091 | "Not enough space to store port name\n"); | |
1092 | break; | |
1093 | } | |
1094 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
1095 | name_size - 1); | |
1096 | port->name[name_size - 1] = 0; | |
1097 | ||
1098 | /* | |
1099 | * Since we only have one sysfs attribute, 'name', | |
1100 | * create it only if we have a name for the port. | |
1101 | */ | |
1102 | err = sysfs_create_group(&port->dev->kobj, | |
1103 | &port_attribute_group); | |
ec64213c | 1104 | if (err) { |
431edb8a AS |
1105 | dev_err(port->dev, |
1106 | "Error %d creating sysfs device attributes\n", | |
1107 | err); | |
ec64213c AS |
1108 | } else { |
1109 | /* | |
1110 | * Generate a udev event so that appropriate | |
1111 | * symlinks can be created based on udev | |
1112 | * rules. | |
1113 | */ | |
1114 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
1115 | } | |
431edb8a | 1116 | break; |
1f7aa42d AS |
1117 | case VIRTIO_CONSOLE_PORT_REMOVE: |
1118 | /* | |
1119 | * Hot unplug the port. We don't decrement nr_ports | |
1120 | * since we don't want to deal with extra complexities | |
1121 | * of using the lowest-available port id: We can just | |
1122 | * pick up the nr_ports number as the id and not have | |
1123 | * userspace send it to us. This helps us in two | |
1124 | * ways: | |
1125 | * | |
1126 | * - We don't need to have a 'port_id' field in the | |
1127 | * config space when a port is hot-added. This is a | |
1128 | * good thing as we might queue up multiple hotplug | |
1129 | * requests issued in our workqueue. | |
1130 | * | |
1131 | * - Another way to deal with this would have been to | |
1132 | * use a bitmap of the active ports and select the | |
1133 | * lowest non-active port from that map. That | |
1134 | * bloats the already tight config space and we | |
1135 | * would end up artificially limiting the | |
1136 | * max. number of ports to sizeof(bitmap). Right | |
1137 | * now we can support 2^32 ports (as the port id is | |
1138 | * stored in a u32 type). | |
1139 | * | |
1140 | */ | |
1141 | remove_port(port); | |
1142 | break; | |
17634ba2 AS |
1143 | } |
1144 | } | |
1145 | ||
1146 | static void control_work_handler(struct work_struct *work) | |
1147 | { | |
1148 | struct ports_device *portdev; | |
1149 | struct virtqueue *vq; | |
1150 | struct port_buffer *buf; | |
1151 | unsigned int len; | |
1152 | ||
1153 | portdev = container_of(work, struct ports_device, control_work); | |
1154 | vq = portdev->c_ivq; | |
1155 | ||
1156 | spin_lock(&portdev->cvq_lock); | |
505b0451 | 1157 | while ((buf = virtqueue_get_buf(vq, &len))) { |
17634ba2 AS |
1158 | spin_unlock(&portdev->cvq_lock); |
1159 | ||
1160 | buf->len = len; | |
1161 | buf->offset = 0; | |
1162 | ||
1163 | handle_control_message(portdev, buf); | |
1164 | ||
1165 | spin_lock(&portdev->cvq_lock); | |
1166 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
1167 | dev_warn(&portdev->vdev->dev, | |
1168 | "Error adding buffer to queue\n"); | |
1169 | free_buf(buf); | |
1170 | } | |
1171 | } | |
1172 | spin_unlock(&portdev->cvq_lock); | |
1173 | } | |
1174 | ||
1175 | static void in_intr(struct virtqueue *vq) | |
1176 | { | |
1177 | struct port *port; | |
1178 | unsigned long flags; | |
1179 | ||
1180 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1181 | if (!port) | |
1182 | return; | |
1183 | ||
1184 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d6933561 AS |
1185 | if (!port->inbuf) |
1186 | port->inbuf = get_inbuf(port); | |
17634ba2 | 1187 | |
88f251ac AS |
1188 | /* |
1189 | * Don't queue up data when port is closed. This condition | |
1190 | * can be reached when a console port is not yet connected (no | |
1191 | * tty is spawned) and the host sends out data to console | |
1192 | * ports. For generic serial ports, the host won't | |
1193 | * (shouldn't) send data till the guest is connected. | |
1194 | */ | |
1195 | if (!port->guest_connected) | |
1196 | discard_port_data(port); | |
1197 | ||
17634ba2 AS |
1198 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1199 | ||
2030fa49 AS |
1200 | wake_up_interruptible(&port->waitqueue); |
1201 | ||
17634ba2 AS |
1202 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1203 | hvc_kick(); | |
1204 | } | |
1205 | ||
1206 | static void control_intr(struct virtqueue *vq) | |
1207 | { | |
1208 | struct ports_device *portdev; | |
1209 | ||
1210 | portdev = vq->vdev->priv; | |
1211 | schedule_work(&portdev->control_work); | |
1212 | } | |
1213 | ||
7f5d810d AS |
1214 | static void config_intr(struct virtio_device *vdev) |
1215 | { | |
1216 | struct ports_device *portdev; | |
1217 | ||
1218 | portdev = vdev->priv; | |
99f905f8 | 1219 | |
7f5d810d AS |
1220 | /* |
1221 | * We'll use this way of resizing only for legacy support. | |
1222 | * For newer userspace (VIRTIO_CONSOLE_F_MULTPORT+), use | |
1223 | * control messages to indicate console size changes so that | |
1224 | * it can be done per-port | |
1225 | */ | |
1226 | resize_console(find_port_by_id(portdev, 0)); | |
1227 | } | |
1228 | ||
2658a79a AS |
1229 | static int init_vqs(struct ports_device *portdev) |
1230 | { | |
1231 | vq_callback_t **io_callbacks; | |
1232 | char **io_names; | |
1233 | struct virtqueue **vqs; | |
17634ba2 | 1234 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1235 | int err; |
1236 | ||
17634ba2 AS |
1237 | nr_ports = portdev->config.max_nr_ports; |
1238 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1239 | |
1240 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
1241 | if (!vqs) { | |
1242 | err = -ENOMEM; | |
1243 | goto fail; | |
1244 | } | |
1245 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); | |
1246 | if (!io_callbacks) { | |
1247 | err = -ENOMEM; | |
1248 | goto free_vqs; | |
1249 | } | |
1250 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); | |
1251 | if (!io_names) { | |
1252 | err = -ENOMEM; | |
1253 | goto free_callbacks; | |
1254 | } | |
1255 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1256 | GFP_KERNEL); | |
1257 | if (!portdev->in_vqs) { | |
1258 | err = -ENOMEM; | |
1259 | goto free_names; | |
1260 | } | |
1261 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1262 | GFP_KERNEL); | |
1263 | if (!portdev->out_vqs) { | |
1264 | err = -ENOMEM; | |
1265 | goto free_invqs; | |
1266 | } | |
1267 | ||
17634ba2 AS |
1268 | /* |
1269 | * For backward compat (newer host but older guest), the host | |
1270 | * spawns a console port first and also inits the vqs for port | |
1271 | * 0 before others. | |
1272 | */ | |
1273 | j = 0; | |
1274 | io_callbacks[j] = in_intr; | |
1275 | io_callbacks[j + 1] = NULL; | |
1276 | io_names[j] = "input"; | |
1277 | io_names[j + 1] = "output"; | |
1278 | j += 2; | |
1279 | ||
1280 | if (use_multiport(portdev)) { | |
1281 | io_callbacks[j] = control_intr; | |
1282 | io_callbacks[j + 1] = NULL; | |
1283 | io_names[j] = "control-i"; | |
1284 | io_names[j + 1] = "control-o"; | |
1285 | ||
1286 | for (i = 1; i < nr_ports; i++) { | |
1287 | j += 2; | |
1288 | io_callbacks[j] = in_intr; | |
1289 | io_callbacks[j + 1] = NULL; | |
1290 | io_names[j] = "input"; | |
1291 | io_names[j + 1] = "output"; | |
1292 | } | |
1293 | } | |
2658a79a AS |
1294 | /* Find the queues. */ |
1295 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1296 | io_callbacks, | |
1297 | (const char **)io_names); | |
1298 | if (err) | |
1299 | goto free_outvqs; | |
1300 | ||
17634ba2 | 1301 | j = 0; |
2658a79a AS |
1302 | portdev->in_vqs[0] = vqs[0]; |
1303 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1304 | j += 2; |
1305 | if (use_multiport(portdev)) { | |
1306 | portdev->c_ivq = vqs[j]; | |
1307 | portdev->c_ovq = vqs[j + 1]; | |
1308 | ||
1309 | for (i = 1; i < nr_ports; i++) { | |
1310 | j += 2; | |
1311 | portdev->in_vqs[i] = vqs[j]; | |
1312 | portdev->out_vqs[i] = vqs[j + 1]; | |
1313 | } | |
1314 | } | |
2658a79a AS |
1315 | kfree(io_callbacks); |
1316 | kfree(io_names); | |
1317 | kfree(vqs); | |
1318 | ||
1319 | return 0; | |
1320 | ||
1321 | free_names: | |
1322 | kfree(io_names); | |
1323 | free_callbacks: | |
1324 | kfree(io_callbacks); | |
1325 | free_outvqs: | |
1326 | kfree(portdev->out_vqs); | |
1327 | free_invqs: | |
1328 | kfree(portdev->in_vqs); | |
1329 | free_vqs: | |
1330 | kfree(vqs); | |
1331 | fail: | |
1332 | return err; | |
1333 | } | |
1334 | ||
fb08bd27 AS |
1335 | static const struct file_operations portdev_fops = { |
1336 | .owner = THIS_MODULE, | |
1337 | }; | |
1338 | ||
1c85bf35 AS |
1339 | /* |
1340 | * Once we're further in boot, we get probed like any other virtio | |
1341 | * device. | |
17634ba2 AS |
1342 | * |
1343 | * If the host also supports multiple console ports, we check the | |
1344 | * config space to see how many ports the host has spawned. We | |
1345 | * initialize each port found. | |
1c85bf35 AS |
1346 | */ |
1347 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1348 | { | |
1c85bf35 | 1349 | struct ports_device *portdev; |
17634ba2 | 1350 | u32 i; |
1c85bf35 | 1351 | int err; |
17634ba2 | 1352 | bool multiport; |
1c85bf35 AS |
1353 | |
1354 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1355 | if (!portdev) { | |
1356 | err = -ENOMEM; | |
1357 | goto fail; | |
1358 | } | |
1359 | ||
1360 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1361 | portdev->vdev = vdev; | |
1362 | vdev->priv = portdev; | |
1363 | ||
fb08bd27 AS |
1364 | spin_lock_irq(&pdrvdata_lock); |
1365 | portdev->drv_index = pdrvdata.index++; | |
1366 | spin_unlock_irq(&pdrvdata_lock); | |
1367 | ||
1368 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1369 | &portdev_fops); | |
1370 | if (portdev->chr_major < 0) { | |
1371 | dev_err(&vdev->dev, | |
1372 | "Error %d registering chrdev for device %u\n", | |
1373 | portdev->chr_major, portdev->drv_index); | |
1374 | err = portdev->chr_major; | |
1375 | goto free; | |
1376 | } | |
1377 | ||
17634ba2 AS |
1378 | multiport = false; |
1379 | portdev->config.nr_ports = 1; | |
1380 | portdev->config.max_nr_ports = 1; | |
1381 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { | |
1382 | multiport = true; | |
1383 | vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; | |
1384 | ||
b99fa815 AS |
1385 | vdev->config->get(vdev, offsetof(struct virtio_console_config, |
1386 | nr_ports), | |
17634ba2 AS |
1387 | &portdev->config.nr_ports, |
1388 | sizeof(portdev->config.nr_ports)); | |
b99fa815 AS |
1389 | vdev->config->get(vdev, offsetof(struct virtio_console_config, |
1390 | max_nr_ports), | |
17634ba2 AS |
1391 | &portdev->config.max_nr_ports, |
1392 | sizeof(portdev->config.max_nr_ports)); | |
1393 | if (portdev->config.nr_ports > portdev->config.max_nr_ports) { | |
1394 | dev_warn(&vdev->dev, | |
1395 | "More ports (%u) specified than allowed (%u). Will init %u ports.", | |
1396 | portdev->config.nr_ports, | |
1397 | portdev->config.max_nr_ports, | |
1398 | portdev->config.max_nr_ports); | |
1399 | ||
1400 | portdev->config.nr_ports = portdev->config.max_nr_ports; | |
1401 | } | |
1402 | } | |
1403 | ||
1404 | /* Let the Host know we support multiple ports.*/ | |
1405 | vdev->config->finalize_features(vdev); | |
1406 | ||
2658a79a AS |
1407 | err = init_vqs(portdev); |
1408 | if (err < 0) { | |
1409 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1410 | goto free_chrdev; |
2658a79a | 1411 | } |
1c85bf35 | 1412 | |
17634ba2 AS |
1413 | spin_lock_init(&portdev->ports_lock); |
1414 | INIT_LIST_HEAD(&portdev->ports); | |
1415 | ||
1416 | if (multiport) { | |
335a64a5 AS |
1417 | unsigned int nr_added_bufs; |
1418 | ||
17634ba2 AS |
1419 | spin_lock_init(&portdev->cvq_lock); |
1420 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
1421 | ||
335a64a5 AS |
1422 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
1423 | if (!nr_added_bufs) { | |
22a29eac AS |
1424 | dev_err(&vdev->dev, |
1425 | "Error allocating buffers for control queue\n"); | |
1426 | err = -ENOMEM; | |
1427 | goto free_vqs; | |
1428 | } | |
17634ba2 AS |
1429 | } |
1430 | ||
1431 | for (i = 0; i < portdev->config.nr_ports; i++) | |
1432 | add_port(portdev, i); | |
1c85bf35 | 1433 | |
971f3390 RR |
1434 | /* Start using the new console output. */ |
1435 | early_put_chars = NULL; | |
31610434 RR |
1436 | return 0; |
1437 | ||
22a29eac AS |
1438 | free_vqs: |
1439 | vdev->config->del_vqs(vdev); | |
1440 | kfree(portdev->in_vqs); | |
1441 | kfree(portdev->out_vqs); | |
fb08bd27 AS |
1442 | free_chrdev: |
1443 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1444 | free: |
1c85bf35 | 1445 | kfree(portdev); |
31610434 | 1446 | fail: |
eaeff960 AS |
1447 | /* The host might want to notify mgmt sw about device add failure */ |
1448 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, | |
1449 | VIRTIO_CONSOLE_DEVICE_READY, 0); | |
31610434 RR |
1450 | return err; |
1451 | } | |
1452 | ||
7177876f AS |
1453 | static void virtcons_remove(struct virtio_device *vdev) |
1454 | { | |
1455 | struct ports_device *portdev; | |
1456 | struct port *port, *port2; | |
1457 | struct port_buffer *buf; | |
1458 | unsigned int len; | |
1459 | ||
1460 | portdev = vdev->priv; | |
1461 | ||
1462 | cancel_work_sync(&portdev->control_work); | |
7177876f AS |
1463 | |
1464 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
1465 | remove_port(port); | |
1466 | ||
1467 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
1468 | ||
505b0451 | 1469 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) |
7177876f AS |
1470 | free_buf(buf); |
1471 | ||
505b0451 | 1472 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) |
7177876f AS |
1473 | free_buf(buf); |
1474 | ||
1475 | vdev->config->del_vqs(vdev); | |
1476 | kfree(portdev->in_vqs); | |
1477 | kfree(portdev->out_vqs); | |
1478 | ||
1479 | kfree(portdev); | |
1480 | } | |
1481 | ||
31610434 RR |
1482 | static struct virtio_device_id id_table[] = { |
1483 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1484 | { 0 }, | |
1485 | }; | |
1486 | ||
c2983458 CB |
1487 | static unsigned int features[] = { |
1488 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 1489 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1490 | }; |
1491 | ||
31610434 | 1492 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1493 | .feature_table = features, |
1494 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1495 | .driver.name = KBUILD_MODNAME, |
1496 | .driver.owner = THIS_MODULE, | |
1497 | .id_table = id_table, | |
1498 | .probe = virtcons_probe, | |
7177876f | 1499 | .remove = virtcons_remove, |
7f5d810d | 1500 | .config_changed = config_intr, |
31610434 RR |
1501 | }; |
1502 | ||
1503 | static int __init init(void) | |
1504 | { | |
fb08bd27 AS |
1505 | int err; |
1506 | ||
1507 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
1508 | if (IS_ERR(pdrvdata.class)) { | |
1509 | err = PTR_ERR(pdrvdata.class); | |
1510 | pr_err("Error %d creating virtio-ports class\n", err); | |
1511 | return err; | |
1512 | } | |
d99393ef AS |
1513 | |
1514 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
1515 | if (!pdrvdata.debugfs_dir) { | |
1516 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
1517 | PTR_ERR(pdrvdata.debugfs_dir)); | |
1518 | } | |
38edf58d AS |
1519 | INIT_LIST_HEAD(&pdrvdata.consoles); |
1520 | ||
31610434 RR |
1521 | return register_virtio_driver(&virtio_console); |
1522 | } | |
7177876f AS |
1523 | |
1524 | static void __exit fini(void) | |
1525 | { | |
1526 | unregister_virtio_driver(&virtio_console); | |
1527 | ||
1528 | class_destroy(pdrvdata.class); | |
1529 | if (pdrvdata.debugfs_dir) | |
1530 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
1531 | } | |
31610434 | 1532 | module_init(init); |
7177876f | 1533 | module_exit(fini); |
31610434 RR |
1534 | |
1535 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1536 | MODULE_DESCRIPTION("Virtio console driver"); | |
1537 | MODULE_LICENSE("GPL"); |