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 | ||
6bdf2afd AS |
51 | /* List of all the devices we're handling */ |
52 | struct list_head portdevs; | |
53 | ||
fb08bd27 AS |
54 | /* Number of devices this driver is handling */ |
55 | unsigned int index; | |
56 | ||
d8a02bd5 RR |
57 | /* |
58 | * This is used to keep track of the number of hvc consoles | |
59 | * spawned by this driver. This number is given as the first | |
60 | * argument to hvc_alloc(). To correctly map an initial | |
61 | * console spawned via hvc_instantiate to the console being | |
62 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
63 | * | |
64 | * We also just assume the first console being initialised was | |
65 | * the first one that got used as the initial console. | |
66 | */ | |
67 | unsigned int next_vtermno; | |
68 | ||
38edf58d AS |
69 | /* All the console devices handled by this driver */ |
70 | struct list_head consoles; | |
71 | }; | |
72 | static struct ports_driver_data pdrvdata; | |
73 | ||
74 | DEFINE_SPINLOCK(pdrvdata_lock); | |
75 | ||
4f23c573 AS |
76 | /* This struct holds information that's relevant only for console ports */ |
77 | struct console { | |
78 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
79 | struct list_head list; | |
80 | ||
81 | /* The hvc device associated with this console port */ | |
82 | struct hvc_struct *hvc; | |
83 | ||
9778829c AS |
84 | /* The size of the console */ |
85 | struct winsize ws; | |
86 | ||
4f23c573 AS |
87 | /* |
88 | * This number identifies the number that we used to register | |
89 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
90 | * number passed on by the hvc callbacks to us to | |
91 | * differentiate between the other console ports handled by | |
92 | * this driver | |
93 | */ | |
94 | u32 vtermno; | |
95 | }; | |
96 | ||
fdb9a054 AS |
97 | struct port_buffer { |
98 | char *buf; | |
99 | ||
100 | /* size of the buffer in *buf above */ | |
101 | size_t size; | |
102 | ||
103 | /* used length of the buffer */ | |
104 | size_t len; | |
105 | /* offset in the buf from which to consume data */ | |
106 | size_t offset; | |
107 | }; | |
108 | ||
17634ba2 AS |
109 | /* |
110 | * This is a per-device struct that stores data common to all the | |
111 | * ports for that device (vdev->priv). | |
112 | */ | |
113 | struct ports_device { | |
6bdf2afd AS |
114 | /* Next portdev in the list, head is in the pdrvdata struct */ |
115 | struct list_head list; | |
116 | ||
17634ba2 AS |
117 | /* |
118 | * Workqueue handlers where we process deferred work after | |
119 | * notification | |
120 | */ | |
121 | struct work_struct control_work; | |
122 | ||
123 | struct list_head ports; | |
124 | ||
125 | /* To protect the list of ports */ | |
126 | spinlock_t ports_lock; | |
127 | ||
128 | /* To protect the vq operations for the control channel */ | |
129 | spinlock_t cvq_lock; | |
130 | ||
131 | /* The current config space is stored here */ | |
b99fa815 | 132 | struct virtio_console_config config; |
17634ba2 AS |
133 | |
134 | /* The virtio device we're associated with */ | |
135 | struct virtio_device *vdev; | |
136 | ||
137 | /* | |
138 | * A couple of virtqueues for the control channel: one for | |
139 | * guest->host transfers, one for host->guest transfers | |
140 | */ | |
141 | struct virtqueue *c_ivq, *c_ovq; | |
142 | ||
143 | /* Array of per-port IO virtqueues */ | |
144 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
145 | |
146 | /* Used for numbering devices for sysfs and debugfs */ | |
147 | unsigned int drv_index; | |
148 | ||
149 | /* Major number for this device. Ports will be created as minors. */ | |
150 | int chr_major; | |
17634ba2 AS |
151 | }; |
152 | ||
1c85bf35 | 153 | /* This struct holds the per-port data */ |
21206ede | 154 | struct port { |
17634ba2 AS |
155 | /* Next port in the list, head is in the ports_device */ |
156 | struct list_head list; | |
157 | ||
1c85bf35 AS |
158 | /* Pointer to the parent virtio_console device */ |
159 | struct ports_device *portdev; | |
fdb9a054 AS |
160 | |
161 | /* The current buffer from which data has to be fed to readers */ | |
162 | struct port_buffer *inbuf; | |
21206ede | 163 | |
203baab8 AS |
164 | /* |
165 | * To protect the operations on the in_vq associated with this | |
166 | * port. Has to be a spinlock because it can be called from | |
167 | * interrupt context (get_char()). | |
168 | */ | |
169 | spinlock_t inbuf_lock; | |
170 | ||
cdfadfc1 AS |
171 | /* Protect the operations on the out_vq. */ |
172 | spinlock_t outvq_lock; | |
173 | ||
1c85bf35 AS |
174 | /* The IO vqs for this port */ |
175 | struct virtqueue *in_vq, *out_vq; | |
176 | ||
d99393ef AS |
177 | /* File in the debugfs directory that exposes this port's information */ |
178 | struct dentry *debugfs_file; | |
179 | ||
4f23c573 AS |
180 | /* |
181 | * The entries in this struct will be valid if this port is | |
182 | * hooked up to an hvc console | |
183 | */ | |
184 | struct console cons; | |
17634ba2 | 185 | |
fb08bd27 | 186 | /* Each port associates with a separate char device */ |
d22a6989 | 187 | struct cdev *cdev; |
fb08bd27 AS |
188 | struct device *dev; |
189 | ||
b353a6b8 AS |
190 | /* Reference-counting to handle port hot-unplugs and file operations */ |
191 | struct kref kref; | |
192 | ||
2030fa49 AS |
193 | /* A waitqueue for poll() or blocking read operations */ |
194 | wait_queue_head_t waitqueue; | |
195 | ||
431edb8a AS |
196 | /* The 'name' of the port that we expose via sysfs properties */ |
197 | char *name; | |
198 | ||
3eae0ade AS |
199 | /* We can notify apps of host connect / disconnect events via SIGIO */ |
200 | struct fasync_struct *async_queue; | |
201 | ||
17634ba2 AS |
202 | /* The 'id' to identify the port with the Host */ |
203 | u32 id; | |
2030fa49 | 204 | |
cdfadfc1 AS |
205 | bool outvq_full; |
206 | ||
2030fa49 AS |
207 | /* Is the host device open */ |
208 | bool host_connected; | |
3c7969cc AS |
209 | |
210 | /* We should allow only one process to open a port */ | |
211 | bool guest_connected; | |
21206ede | 212 | }; |
31610434 | 213 | |
971f3390 RR |
214 | /* This is the very early arch-specified put chars function. */ |
215 | static int (*early_put_chars)(u32, const char *, int); | |
216 | ||
38edf58d AS |
217 | static struct port *find_port_by_vtermno(u32 vtermno) |
218 | { | |
219 | struct port *port; | |
4f23c573 | 220 | struct console *cons; |
38edf58d AS |
221 | unsigned long flags; |
222 | ||
223 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
224 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
225 | if (cons->vtermno == vtermno) { | |
226 | port = container_of(cons, struct port, cons); | |
38edf58d | 227 | goto out; |
4f23c573 | 228 | } |
38edf58d AS |
229 | } |
230 | port = NULL; | |
231 | out: | |
232 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
233 | return port; | |
234 | } | |
235 | ||
04950cdf AS |
236 | static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, |
237 | dev_t dev) | |
238 | { | |
239 | struct port *port; | |
240 | unsigned long flags; | |
241 | ||
242 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
243 | list_for_each_entry(port, &portdev->ports, list) | |
d22a6989 | 244 | if (port->cdev->dev == dev) |
04950cdf AS |
245 | goto out; |
246 | port = NULL; | |
247 | out: | |
248 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
249 | ||
250 | return port; | |
251 | } | |
252 | ||
253 | static struct port *find_port_by_devt(dev_t dev) | |
254 | { | |
255 | struct ports_device *portdev; | |
256 | struct port *port; | |
257 | unsigned long flags; | |
258 | ||
259 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
260 | list_for_each_entry(portdev, &pdrvdata.portdevs, list) { | |
261 | port = find_port_by_devt_in_portdev(portdev, dev); | |
262 | if (port) | |
263 | goto out; | |
264 | } | |
265 | port = NULL; | |
266 | out: | |
267 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
268 | return port; | |
269 | } | |
270 | ||
17634ba2 AS |
271 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
272 | { | |
273 | struct port *port; | |
274 | unsigned long flags; | |
275 | ||
276 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
277 | list_for_each_entry(port, &portdev->ports, list) | |
278 | if (port->id == id) | |
279 | goto out; | |
280 | port = NULL; | |
281 | out: | |
282 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
283 | ||
284 | return port; | |
285 | } | |
286 | ||
203baab8 AS |
287 | static struct port *find_port_by_vq(struct ports_device *portdev, |
288 | struct virtqueue *vq) | |
289 | { | |
290 | struct port *port; | |
203baab8 AS |
291 | unsigned long flags; |
292 | ||
17634ba2 AS |
293 | spin_lock_irqsave(&portdev->ports_lock, flags); |
294 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
295 | if (port->in_vq == vq || port->out_vq == vq) |
296 | goto out; | |
203baab8 AS |
297 | port = NULL; |
298 | out: | |
17634ba2 | 299 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
300 | return port; |
301 | } | |
302 | ||
17634ba2 AS |
303 | static bool is_console_port(struct port *port) |
304 | { | |
305 | if (port->cons.hvc) | |
306 | return true; | |
307 | return false; | |
308 | } | |
309 | ||
310 | static inline bool use_multiport(struct ports_device *portdev) | |
311 | { | |
312 | /* | |
313 | * This condition can be true when put_chars is called from | |
314 | * early_init | |
315 | */ | |
316 | if (!portdev->vdev) | |
317 | return 0; | |
318 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
319 | } | |
320 | ||
fdb9a054 AS |
321 | static void free_buf(struct port_buffer *buf) |
322 | { | |
323 | kfree(buf->buf); | |
324 | kfree(buf); | |
325 | } | |
326 | ||
327 | static struct port_buffer *alloc_buf(size_t buf_size) | |
328 | { | |
329 | struct port_buffer *buf; | |
330 | ||
331 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
332 | if (!buf) | |
333 | goto fail; | |
334 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
335 | if (!buf->buf) | |
336 | goto free_buf; | |
337 | buf->len = 0; | |
338 | buf->offset = 0; | |
339 | buf->size = buf_size; | |
340 | return buf; | |
341 | ||
342 | free_buf: | |
343 | kfree(buf); | |
344 | fail: | |
345 | return NULL; | |
346 | } | |
347 | ||
a3cde449 AS |
348 | /* Callers should take appropriate locks */ |
349 | static void *get_inbuf(struct port *port) | |
350 | { | |
351 | struct port_buffer *buf; | |
352 | struct virtqueue *vq; | |
353 | unsigned int len; | |
354 | ||
355 | vq = port->in_vq; | |
505b0451 | 356 | buf = virtqueue_get_buf(vq, &len); |
a3cde449 AS |
357 | if (buf) { |
358 | buf->len = len; | |
359 | buf->offset = 0; | |
360 | } | |
361 | return buf; | |
362 | } | |
363 | ||
e27b5198 AS |
364 | /* |
365 | * Create a scatter-gather list representing our input buffer and put | |
366 | * it in the queue. | |
367 | * | |
368 | * Callers should take appropriate locks. | |
369 | */ | |
203baab8 | 370 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
371 | { |
372 | struct scatterlist sg[1]; | |
203baab8 | 373 | int ret; |
1c85bf35 | 374 | |
e27b5198 AS |
375 | sg_init_one(sg, buf->buf, buf->size); |
376 | ||
505b0451 MT |
377 | ret = virtqueue_add_buf(vq, sg, 0, 1, buf); |
378 | virtqueue_kick(vq); | |
203baab8 AS |
379 | return ret; |
380 | } | |
381 | ||
88f251ac AS |
382 | /* Discard any unread data this port has. Callers lockers. */ |
383 | static void discard_port_data(struct port *port) | |
384 | { | |
385 | struct port_buffer *buf; | |
386 | struct virtqueue *vq; | |
387 | unsigned int len; | |
d6933561 | 388 | int ret; |
88f251ac AS |
389 | |
390 | vq = port->in_vq; | |
391 | if (port->inbuf) | |
392 | buf = port->inbuf; | |
393 | else | |
505b0451 | 394 | buf = virtqueue_get_buf(vq, &len); |
88f251ac | 395 | |
d6933561 AS |
396 | ret = 0; |
397 | while (buf) { | |
398 | if (add_inbuf(vq, buf) < 0) { | |
399 | ret++; | |
400 | free_buf(buf); | |
401 | } | |
505b0451 | 402 | buf = virtqueue_get_buf(vq, &len); |
88f251ac | 403 | } |
88f251ac | 404 | port->inbuf = NULL; |
d6933561 AS |
405 | if (ret) |
406 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", | |
407 | ret); | |
88f251ac AS |
408 | } |
409 | ||
203baab8 AS |
410 | static bool port_has_data(struct port *port) |
411 | { | |
412 | unsigned long flags; | |
413 | bool ret; | |
414 | ||
203baab8 | 415 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 416 | if (port->inbuf) { |
203baab8 | 417 | ret = true; |
d6933561 AS |
418 | goto out; |
419 | } | |
420 | port->inbuf = get_inbuf(port); | |
421 | if (port->inbuf) { | |
422 | ret = true; | |
423 | goto out; | |
424 | } | |
425 | ret = false; | |
426 | out: | |
203baab8 | 427 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
428 | return ret; |
429 | } | |
430 | ||
3425e706 AS |
431 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
432 | unsigned int event, unsigned int value) | |
17634ba2 AS |
433 | { |
434 | struct scatterlist sg[1]; | |
435 | struct virtio_console_control cpkt; | |
436 | struct virtqueue *vq; | |
604b2ad7 | 437 | unsigned int len; |
17634ba2 | 438 | |
3425e706 | 439 | if (!use_multiport(portdev)) |
17634ba2 AS |
440 | return 0; |
441 | ||
3425e706 | 442 | cpkt.id = port_id; |
17634ba2 AS |
443 | cpkt.event = event; |
444 | cpkt.value = value; | |
445 | ||
3425e706 | 446 | vq = portdev->c_ovq; |
17634ba2 AS |
447 | |
448 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
505b0451 MT |
449 | if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt) >= 0) { |
450 | virtqueue_kick(vq); | |
451 | while (!virtqueue_get_buf(vq, &len)) | |
17634ba2 AS |
452 | cpu_relax(); |
453 | } | |
454 | return 0; | |
455 | } | |
456 | ||
3425e706 AS |
457 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
458 | unsigned int value) | |
459 | { | |
84ec06c5 AS |
460 | /* Did the port get unplugged before userspace closed it? */ |
461 | if (port->portdev) | |
462 | return __send_control_msg(port->portdev, port->id, event, value); | |
463 | return 0; | |
3425e706 AS |
464 | } |
465 | ||
cdfadfc1 AS |
466 | /* Callers must take the port->outvq_lock */ |
467 | static void reclaim_consumed_buffers(struct port *port) | |
468 | { | |
469 | void *buf; | |
470 | unsigned int len; | |
471 | ||
472 | while ((buf = virtqueue_get_buf(port->out_vq, &len))) { | |
473 | kfree(buf); | |
474 | port->outvq_full = false; | |
475 | } | |
476 | } | |
477 | ||
478 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count, | |
479 | bool nonblock) | |
f997f00b AS |
480 | { |
481 | struct scatterlist sg[1]; | |
482 | struct virtqueue *out_vq; | |
483 | ssize_t ret; | |
cdfadfc1 | 484 | unsigned long flags; |
f997f00b AS |
485 | unsigned int len; |
486 | ||
487 | out_vq = port->out_vq; | |
488 | ||
cdfadfc1 AS |
489 | spin_lock_irqsave(&port->outvq_lock, flags); |
490 | ||
491 | reclaim_consumed_buffers(port); | |
492 | ||
f997f00b | 493 | sg_init_one(sg, in_buf, in_count); |
505b0451 | 494 | ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf); |
f997f00b AS |
495 | |
496 | /* Tell Host to go! */ | |
505b0451 | 497 | virtqueue_kick(out_vq); |
f997f00b AS |
498 | |
499 | if (ret < 0) { | |
9ff4cfab | 500 | in_count = 0; |
cdfadfc1 | 501 | goto done; |
f997f00b AS |
502 | } |
503 | ||
cdfadfc1 AS |
504 | if (ret == 0) |
505 | port->outvq_full = true; | |
506 | ||
507 | if (nonblock) | |
508 | goto done; | |
509 | ||
510 | /* | |
511 | * Wait till the host acknowledges it pushed out the data we | |
531295e6 AS |
512 | * sent. This is done for data from the hvc_console; the tty |
513 | * operations are performed with spinlocks held so we can't | |
514 | * sleep here. An alternative would be to copy the data to a | |
515 | * buffer and relax the spinning requirement. The downside is | |
516 | * we need to kmalloc a GFP_ATOMIC buffer each time the | |
517 | * console driver writes something out. | |
cdfadfc1 | 518 | */ |
505b0451 | 519 | while (!virtqueue_get_buf(out_vq, &len)) |
f997f00b | 520 | cpu_relax(); |
cdfadfc1 AS |
521 | done: |
522 | spin_unlock_irqrestore(&port->outvq_lock, flags); | |
523 | /* | |
524 | * We're expected to return the amount of data we wrote -- all | |
525 | * of it | |
526 | */ | |
9ff4cfab | 527 | return in_count; |
f997f00b AS |
528 | } |
529 | ||
203baab8 AS |
530 | /* |
531 | * Give out the data that's requested from the buffer that we have | |
532 | * queued up. | |
533 | */ | |
b766ceed AS |
534 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
535 | bool to_user) | |
203baab8 AS |
536 | { |
537 | struct port_buffer *buf; | |
538 | unsigned long flags; | |
539 | ||
540 | if (!out_count || !port_has_data(port)) | |
541 | return 0; | |
542 | ||
543 | buf = port->inbuf; | |
b766ceed | 544 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 545 | |
b766ceed AS |
546 | if (to_user) { |
547 | ssize_t ret; | |
548 | ||
549 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
550 | if (ret) | |
551 | return -EFAULT; | |
552 | } else { | |
553 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
554 | } | |
203baab8 | 555 | |
203baab8 AS |
556 | buf->offset += out_count; |
557 | ||
558 | if (buf->offset == buf->len) { | |
559 | /* | |
560 | * We're done using all the data in this buffer. | |
561 | * Re-queue so that the Host can send us more data. | |
562 | */ | |
563 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
564 | port->inbuf = NULL; | |
565 | ||
566 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 567 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
568 | |
569 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
570 | } | |
b766ceed | 571 | /* Return the number of bytes actually copied */ |
203baab8 | 572 | return out_count; |
e27b5198 AS |
573 | } |
574 | ||
2030fa49 | 575 | /* The condition that must be true for polling to end */ |
60caacd3 | 576 | static bool will_read_block(struct port *port) |
2030fa49 | 577 | { |
3709ea7a AS |
578 | if (!port->guest_connected) { |
579 | /* Port got hot-unplugged. Let's exit. */ | |
580 | return false; | |
581 | } | |
60caacd3 | 582 | return !port_has_data(port) && port->host_connected; |
2030fa49 AS |
583 | } |
584 | ||
cdfadfc1 AS |
585 | static bool will_write_block(struct port *port) |
586 | { | |
587 | bool ret; | |
588 | ||
60e5e0b8 AS |
589 | if (!port->guest_connected) { |
590 | /* Port got hot-unplugged. Let's exit. */ | |
591 | return false; | |
592 | } | |
cdfadfc1 AS |
593 | if (!port->host_connected) |
594 | return true; | |
595 | ||
596 | spin_lock_irq(&port->outvq_lock); | |
597 | /* | |
598 | * Check if the Host has consumed any buffers since we last | |
599 | * sent data (this is only applicable for nonblocking ports). | |
600 | */ | |
601 | reclaim_consumed_buffers(port); | |
602 | ret = port->outvq_full; | |
603 | spin_unlock_irq(&port->outvq_lock); | |
604 | ||
605 | return ret; | |
606 | } | |
607 | ||
2030fa49 AS |
608 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, |
609 | size_t count, loff_t *offp) | |
610 | { | |
611 | struct port *port; | |
612 | ssize_t ret; | |
613 | ||
614 | port = filp->private_data; | |
615 | ||
616 | if (!port_has_data(port)) { | |
617 | /* | |
618 | * If nothing's connected on the host just return 0 in | |
619 | * case of list_empty; this tells the userspace app | |
620 | * that there's no connection | |
621 | */ | |
622 | if (!port->host_connected) | |
623 | return 0; | |
624 | if (filp->f_flags & O_NONBLOCK) | |
625 | return -EAGAIN; | |
626 | ||
627 | ret = wait_event_interruptible(port->waitqueue, | |
60caacd3 | 628 | !will_read_block(port)); |
2030fa49 AS |
629 | if (ret < 0) |
630 | return ret; | |
631 | } | |
b3dddb9e AS |
632 | /* Port got hot-unplugged. */ |
633 | if (!port->guest_connected) | |
634 | return -ENODEV; | |
2030fa49 AS |
635 | /* |
636 | * We could've received a disconnection message while we were | |
637 | * waiting for more data. | |
638 | * | |
639 | * This check is not clubbed in the if() statement above as we | |
640 | * might receive some data as well as the host could get | |
641 | * disconnected after we got woken up from our wait. So we | |
642 | * really want to give off whatever data we have and only then | |
643 | * check for host_connected. | |
644 | */ | |
645 | if (!port_has_data(port) && !port->host_connected) | |
646 | return 0; | |
647 | ||
648 | return fill_readbuf(port, ubuf, count, true); | |
649 | } | |
650 | ||
651 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
652 | size_t count, loff_t *offp) | |
653 | { | |
654 | struct port *port; | |
655 | char *buf; | |
656 | ssize_t ret; | |
cdfadfc1 | 657 | bool nonblock; |
2030fa49 | 658 | |
65745422 AS |
659 | /* Userspace could be out to fool us */ |
660 | if (!count) | |
661 | return 0; | |
662 | ||
2030fa49 AS |
663 | port = filp->private_data; |
664 | ||
cdfadfc1 AS |
665 | nonblock = filp->f_flags & O_NONBLOCK; |
666 | ||
667 | if (will_write_block(port)) { | |
668 | if (nonblock) | |
669 | return -EAGAIN; | |
670 | ||
671 | ret = wait_event_interruptible(port->waitqueue, | |
672 | !will_write_block(port)); | |
673 | if (ret < 0) | |
674 | return ret; | |
675 | } | |
f4028119 AS |
676 | /* Port got hot-unplugged. */ |
677 | if (!port->guest_connected) | |
678 | return -ENODEV; | |
cdfadfc1 | 679 | |
2030fa49 AS |
680 | count = min((size_t)(32 * 1024), count); |
681 | ||
682 | buf = kmalloc(count, GFP_KERNEL); | |
683 | if (!buf) | |
684 | return -ENOMEM; | |
685 | ||
686 | ret = copy_from_user(buf, ubuf, count); | |
687 | if (ret) { | |
688 | ret = -EFAULT; | |
689 | goto free_buf; | |
690 | } | |
691 | ||
531295e6 AS |
692 | /* |
693 | * We now ask send_buf() to not spin for generic ports -- we | |
694 | * can re-use the same code path that non-blocking file | |
695 | * descriptors take for blocking file descriptors since the | |
696 | * wait is already done and we're certain the write will go | |
697 | * through to the host. | |
698 | */ | |
699 | nonblock = true; | |
cdfadfc1 AS |
700 | ret = send_buf(port, buf, count, nonblock); |
701 | ||
702 | if (nonblock && ret > 0) | |
703 | goto out; | |
704 | ||
2030fa49 AS |
705 | free_buf: |
706 | kfree(buf); | |
cdfadfc1 | 707 | out: |
2030fa49 AS |
708 | return ret; |
709 | } | |
710 | ||
711 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
712 | { | |
713 | struct port *port; | |
714 | unsigned int ret; | |
715 | ||
716 | port = filp->private_data; | |
717 | poll_wait(filp, &port->waitqueue, wait); | |
718 | ||
8529a504 AS |
719 | if (!port->guest_connected) { |
720 | /* Port got unplugged */ | |
721 | return POLLHUP; | |
722 | } | |
2030fa49 | 723 | ret = 0; |
6df7aadc | 724 | if (!will_read_block(port)) |
2030fa49 | 725 | ret |= POLLIN | POLLRDNORM; |
cdfadfc1 | 726 | if (!will_write_block(port)) |
2030fa49 AS |
727 | ret |= POLLOUT; |
728 | if (!port->host_connected) | |
729 | ret |= POLLHUP; | |
730 | ||
731 | return ret; | |
732 | } | |
733 | ||
b353a6b8 AS |
734 | static void remove_port(struct kref *kref); |
735 | ||
2030fa49 AS |
736 | static int port_fops_release(struct inode *inode, struct file *filp) |
737 | { | |
738 | struct port *port; | |
739 | ||
740 | port = filp->private_data; | |
741 | ||
742 | /* Notify host of port being closed */ | |
743 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
744 | ||
88f251ac | 745 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
746 | port->guest_connected = false; |
747 | ||
88f251ac AS |
748 | discard_port_data(port); |
749 | ||
750 | spin_unlock_irq(&port->inbuf_lock); | |
751 | ||
cdfadfc1 AS |
752 | spin_lock_irq(&port->outvq_lock); |
753 | reclaim_consumed_buffers(port); | |
754 | spin_unlock_irq(&port->outvq_lock); | |
755 | ||
b353a6b8 AS |
756 | /* |
757 | * Locks aren't necessary here as a port can't be opened after | |
758 | * unplug, and if a port isn't unplugged, a kref would already | |
759 | * exist for the port. Plus, taking ports_lock here would | |
760 | * create a dependency on other locks taken by functions | |
761 | * inside remove_port if we're the last holder of the port, | |
762 | * creating many problems. | |
763 | */ | |
764 | kref_put(&port->kref, remove_port); | |
765 | ||
2030fa49 AS |
766 | return 0; |
767 | } | |
768 | ||
769 | static int port_fops_open(struct inode *inode, struct file *filp) | |
770 | { | |
771 | struct cdev *cdev = inode->i_cdev; | |
772 | struct port *port; | |
8ad37e83 | 773 | int ret; |
2030fa49 | 774 | |
04950cdf | 775 | port = find_port_by_devt(cdev->dev); |
2030fa49 AS |
776 | filp->private_data = port; |
777 | ||
b353a6b8 AS |
778 | /* Prevent against a port getting hot-unplugged at the same time */ |
779 | spin_lock_irq(&port->portdev->ports_lock); | |
780 | kref_get(&port->kref); | |
781 | spin_unlock_irq(&port->portdev->ports_lock); | |
782 | ||
2030fa49 AS |
783 | /* |
784 | * Don't allow opening of console port devices -- that's done | |
785 | * via /dev/hvc | |
786 | */ | |
8ad37e83 AS |
787 | if (is_console_port(port)) { |
788 | ret = -ENXIO; | |
789 | goto out; | |
790 | } | |
2030fa49 | 791 | |
3c7969cc AS |
792 | /* Allow only one process to open a particular port at a time */ |
793 | spin_lock_irq(&port->inbuf_lock); | |
794 | if (port->guest_connected) { | |
795 | spin_unlock_irq(&port->inbuf_lock); | |
8ad37e83 AS |
796 | ret = -EMFILE; |
797 | goto out; | |
3c7969cc AS |
798 | } |
799 | ||
800 | port->guest_connected = true; | |
801 | spin_unlock_irq(&port->inbuf_lock); | |
802 | ||
cdfadfc1 AS |
803 | spin_lock_irq(&port->outvq_lock); |
804 | /* | |
805 | * There might be a chance that we missed reclaiming a few | |
806 | * buffers in the window of the port getting previously closed | |
807 | * and opening now. | |
808 | */ | |
809 | reclaim_consumed_buffers(port); | |
810 | spin_unlock_irq(&port->outvq_lock); | |
811 | ||
2030fa49 AS |
812 | /* Notify host of port being opened */ |
813 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
814 | ||
815 | return 0; | |
8ad37e83 | 816 | out: |
b353a6b8 | 817 | kref_put(&port->kref, remove_port); |
8ad37e83 | 818 | return ret; |
2030fa49 AS |
819 | } |
820 | ||
3eae0ade AS |
821 | static int port_fops_fasync(int fd, struct file *filp, int mode) |
822 | { | |
823 | struct port *port; | |
824 | ||
825 | port = filp->private_data; | |
826 | return fasync_helper(fd, filp, mode, &port->async_queue); | |
827 | } | |
828 | ||
2030fa49 AS |
829 | /* |
830 | * The file operations that we support: programs in the guest can open | |
831 | * a console device, read from it, write to it, poll for data and | |
832 | * close it. The devices are at | |
833 | * /dev/vport<device number>p<port number> | |
834 | */ | |
835 | static const struct file_operations port_fops = { | |
836 | .owner = THIS_MODULE, | |
837 | .open = port_fops_open, | |
838 | .read = port_fops_read, | |
839 | .write = port_fops_write, | |
840 | .poll = port_fops_poll, | |
841 | .release = port_fops_release, | |
3eae0ade | 842 | .fasync = port_fops_fasync, |
2030fa49 AS |
843 | }; |
844 | ||
a23ea924 RR |
845 | /* |
846 | * The put_chars() callback is pretty straightforward. | |
31610434 | 847 | * |
a23ea924 RR |
848 | * We turn the characters into a scatter-gather list, add it to the |
849 | * output queue and then kick the Host. Then we sit here waiting for | |
850 | * it to finish: inefficient in theory, but in practice | |
851 | * implementations will do it immediately (lguest's Launcher does). | |
852 | */ | |
31610434 RR |
853 | static int put_chars(u32 vtermno, const char *buf, int count) |
854 | { | |
21206ede | 855 | struct port *port; |
38edf58d | 856 | |
162a689a FD |
857 | if (unlikely(early_put_chars)) |
858 | return early_put_chars(vtermno, buf, count); | |
859 | ||
38edf58d AS |
860 | port = find_port_by_vtermno(vtermno); |
861 | if (!port) | |
6dc69f97 | 862 | return -EPIPE; |
31610434 | 863 | |
cdfadfc1 | 864 | return send_buf(port, (void *)buf, count, false); |
31610434 RR |
865 | } |
866 | ||
a23ea924 RR |
867 | /* |
868 | * get_chars() is the callback from the hvc_console infrastructure | |
869 | * when an interrupt is received. | |
31610434 | 870 | * |
203baab8 AS |
871 | * We call out to fill_readbuf that gets us the required data from the |
872 | * buffers that are queued up. | |
a23ea924 | 873 | */ |
31610434 RR |
874 | static int get_chars(u32 vtermno, char *buf, int count) |
875 | { | |
21206ede RR |
876 | struct port *port; |
877 | ||
6dc69f97 AS |
878 | /* If we've not set up the port yet, we have no input to give. */ |
879 | if (unlikely(early_put_chars)) | |
880 | return 0; | |
881 | ||
38edf58d AS |
882 | port = find_port_by_vtermno(vtermno); |
883 | if (!port) | |
6dc69f97 | 884 | return -EPIPE; |
21206ede | 885 | |
31610434 | 886 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 887 | BUG_ON(!port->in_vq); |
31610434 | 888 | |
b766ceed | 889 | return fill_readbuf(port, buf, count, false); |
31610434 | 890 | } |
31610434 | 891 | |
cb06e367 | 892 | static void resize_console(struct port *port) |
c2983458 | 893 | { |
cb06e367 | 894 | struct virtio_device *vdev; |
c2983458 | 895 | |
2de16a49 | 896 | /* The port could have been hot-unplugged */ |
9778829c | 897 | if (!port || !is_console_port(port)) |
2de16a49 AS |
898 | return; |
899 | ||
cb06e367 | 900 | vdev = port->portdev->vdev; |
9778829c AS |
901 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) |
902 | hvc_resize(port->cons.hvc, port->cons.ws); | |
c2983458 CB |
903 | } |
904 | ||
38edf58d | 905 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
906 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
907 | { | |
38edf58d AS |
908 | struct port *port; |
909 | ||
910 | port = find_port_by_vtermno(hp->vtermno); | |
911 | if (!port) | |
912 | return -EINVAL; | |
913 | ||
91fcad19 | 914 | hp->irq_requested = 1; |
cb06e367 | 915 | resize_console(port); |
c2983458 | 916 | |
91fcad19 CB |
917 | return 0; |
918 | } | |
919 | ||
920 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
921 | { | |
922 | hp->irq_requested = 0; | |
923 | } | |
924 | ||
17634ba2 | 925 | /* The operations for console ports. */ |
1dff3996 | 926 | static const struct hv_ops hv_ops = { |
971f3390 RR |
927 | .get_chars = get_chars, |
928 | .put_chars = put_chars, | |
929 | .notifier_add = notifier_add_vio, | |
930 | .notifier_del = notifier_del_vio, | |
931 | .notifier_hangup = notifier_del_vio, | |
932 | }; | |
933 | ||
934 | /* | |
935 | * Console drivers are initialized very early so boot messages can go | |
936 | * out, so we do things slightly differently from the generic virtio | |
937 | * initialization of the net and block drivers. | |
938 | * | |
939 | * At this stage, the console is output-only. It's too early to set | |
940 | * up a virtqueue, so we let the drivers do some boutique early-output | |
941 | * thing. | |
942 | */ | |
943 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
944 | { | |
945 | early_put_chars = put_chars; | |
946 | return hvc_instantiate(0, 0, &hv_ops); | |
947 | } | |
948 | ||
17634ba2 | 949 | int init_port_console(struct port *port) |
cfa6d379 AS |
950 | { |
951 | int ret; | |
952 | ||
953 | /* | |
954 | * The Host's telling us this port is a console port. Hook it | |
955 | * up with an hvc console. | |
956 | * | |
957 | * To set up and manage our virtual console, we call | |
958 | * hvc_alloc(). | |
959 | * | |
960 | * The first argument of hvc_alloc() is the virtual console | |
961 | * number. The second argument is the parameter for the | |
962 | * notification mechanism (like irq number). We currently | |
963 | * leave this as zero, virtqueues have implicit notifications. | |
964 | * | |
965 | * The third argument is a "struct hv_ops" containing the | |
966 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
967 | * pointers. The final argument is the output buffer size: we | |
968 | * can do any size, so we put PAGE_SIZE here. | |
969 | */ | |
970 | port->cons.vtermno = pdrvdata.next_vtermno; | |
971 | ||
972 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
973 | if (IS_ERR(port->cons.hvc)) { | |
974 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
975 | dev_err(port->dev, |
976 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
977 | port->cons.hvc = NULL; |
978 | return ret; | |
979 | } | |
980 | spin_lock_irq(&pdrvdata_lock); | |
981 | pdrvdata.next_vtermno++; | |
982 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
983 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 984 | port->guest_connected = true; |
cfa6d379 | 985 | |
1d05160b AS |
986 | /* |
987 | * Start using the new console output if this is the first | |
988 | * console to come up. | |
989 | */ | |
990 | if (early_put_chars) | |
991 | early_put_chars = NULL; | |
992 | ||
2030fa49 AS |
993 | /* Notify host of port being opened */ |
994 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
995 | ||
cfa6d379 AS |
996 | return 0; |
997 | } | |
998 | ||
431edb8a AS |
999 | static ssize_t show_port_name(struct device *dev, |
1000 | struct device_attribute *attr, char *buffer) | |
1001 | { | |
1002 | struct port *port; | |
1003 | ||
1004 | port = dev_get_drvdata(dev); | |
1005 | ||
1006 | return sprintf(buffer, "%s\n", port->name); | |
1007 | } | |
1008 | ||
1009 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
1010 | ||
1011 | static struct attribute *port_sysfs_entries[] = { | |
1012 | &dev_attr_name.attr, | |
1013 | NULL | |
1014 | }; | |
1015 | ||
1016 | static struct attribute_group port_attribute_group = { | |
1017 | .name = NULL, /* put in device directory */ | |
1018 | .attrs = port_sysfs_entries, | |
1019 | }; | |
1020 | ||
d99393ef AS |
1021 | static int debugfs_open(struct inode *inode, struct file *filp) |
1022 | { | |
1023 | filp->private_data = inode->i_private; | |
1024 | return 0; | |
1025 | } | |
1026 | ||
1027 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, | |
1028 | size_t count, loff_t *offp) | |
1029 | { | |
1030 | struct port *port; | |
1031 | char *buf; | |
1032 | ssize_t ret, out_offset, out_count; | |
1033 | ||
1034 | out_count = 1024; | |
1035 | buf = kmalloc(out_count, GFP_KERNEL); | |
1036 | if (!buf) | |
1037 | return -ENOMEM; | |
1038 | ||
1039 | port = filp->private_data; | |
1040 | out_offset = 0; | |
1041 | out_offset += snprintf(buf + out_offset, out_count, | |
1042 | "name: %s\n", port->name ? port->name : ""); | |
1043 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1044 | "guest_connected: %d\n", port->guest_connected); | |
1045 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1046 | "host_connected: %d\n", port->host_connected); | |
cdfadfc1 AS |
1047 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1048 | "outvq_full: %d\n", port->outvq_full); | |
d99393ef AS |
1049 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1050 | "is_console: %s\n", | |
1051 | is_console_port(port) ? "yes" : "no"); | |
1052 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1053 | "console_vtermno: %u\n", port->cons.vtermno); | |
1054 | ||
1055 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
1056 | kfree(buf); | |
1057 | return ret; | |
1058 | } | |
1059 | ||
1060 | static const struct file_operations port_debugfs_ops = { | |
1061 | .owner = THIS_MODULE, | |
1062 | .open = debugfs_open, | |
1063 | .read = debugfs_read, | |
1064 | }; | |
1065 | ||
9778829c AS |
1066 | static void set_console_size(struct port *port, u16 rows, u16 cols) |
1067 | { | |
1068 | if (!port || !is_console_port(port)) | |
1069 | return; | |
1070 | ||
1071 | port->cons.ws.ws_row = rows; | |
1072 | port->cons.ws.ws_col = cols; | |
1073 | } | |
1074 | ||
c446f8fc AS |
1075 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
1076 | { | |
1077 | struct port_buffer *buf; | |
1078 | unsigned int nr_added_bufs; | |
1079 | int ret; | |
1080 | ||
1081 | nr_added_bufs = 0; | |
1082 | do { | |
1083 | buf = alloc_buf(PAGE_SIZE); | |
1084 | if (!buf) | |
1085 | break; | |
1086 | ||
1087 | spin_lock_irq(lock); | |
1088 | ret = add_inbuf(vq, buf); | |
1089 | if (ret < 0) { | |
1090 | spin_unlock_irq(lock); | |
1091 | free_buf(buf); | |
1092 | break; | |
1093 | } | |
1094 | nr_added_bufs++; | |
1095 | spin_unlock_irq(lock); | |
1096 | } while (ret > 0); | |
1097 | ||
1098 | return nr_added_bufs; | |
1099 | } | |
1100 | ||
3eae0ade AS |
1101 | static void send_sigio_to_port(struct port *port) |
1102 | { | |
1103 | if (port->async_queue && port->guest_connected) | |
1104 | kill_fasync(&port->async_queue, SIGIO, POLL_OUT); | |
1105 | } | |
1106 | ||
c446f8fc AS |
1107 | static int add_port(struct ports_device *portdev, u32 id) |
1108 | { | |
1109 | char debugfs_name[16]; | |
1110 | struct port *port; | |
1111 | struct port_buffer *buf; | |
1112 | dev_t devt; | |
1113 | unsigned int nr_added_bufs; | |
1114 | int err; | |
1115 | ||
1116 | port = kmalloc(sizeof(*port), GFP_KERNEL); | |
1117 | if (!port) { | |
1118 | err = -ENOMEM; | |
1119 | goto fail; | |
1120 | } | |
b353a6b8 | 1121 | kref_init(&port->kref); |
c446f8fc AS |
1122 | |
1123 | port->portdev = portdev; | |
1124 | port->id = id; | |
1125 | ||
1126 | port->name = NULL; | |
1127 | port->inbuf = NULL; | |
1128 | port->cons.hvc = NULL; | |
3eae0ade | 1129 | port->async_queue = NULL; |
c446f8fc | 1130 | |
9778829c AS |
1131 | port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
1132 | ||
c446f8fc AS |
1133 | port->host_connected = port->guest_connected = false; |
1134 | ||
cdfadfc1 AS |
1135 | port->outvq_full = false; |
1136 | ||
c446f8fc AS |
1137 | port->in_vq = portdev->in_vqs[port->id]; |
1138 | port->out_vq = portdev->out_vqs[port->id]; | |
1139 | ||
d22a6989 AS |
1140 | port->cdev = cdev_alloc(); |
1141 | if (!port->cdev) { | |
1142 | dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); | |
1143 | err = -ENOMEM; | |
1144 | goto free_port; | |
1145 | } | |
1146 | port->cdev->ops = &port_fops; | |
c446f8fc AS |
1147 | |
1148 | devt = MKDEV(portdev->chr_major, id); | |
d22a6989 | 1149 | err = cdev_add(port->cdev, devt, 1); |
c446f8fc AS |
1150 | if (err < 0) { |
1151 | dev_err(&port->portdev->vdev->dev, | |
1152 | "Error %d adding cdev for port %u\n", err, id); | |
d22a6989 | 1153 | goto free_cdev; |
c446f8fc AS |
1154 | } |
1155 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1156 | devt, port, "vport%up%u", | |
1157 | port->portdev->drv_index, id); | |
1158 | if (IS_ERR(port->dev)) { | |
1159 | err = PTR_ERR(port->dev); | |
1160 | dev_err(&port->portdev->vdev->dev, | |
1161 | "Error %d creating device for port %u\n", | |
1162 | err, id); | |
1163 | goto free_cdev; | |
1164 | } | |
1165 | ||
1166 | spin_lock_init(&port->inbuf_lock); | |
cdfadfc1 | 1167 | spin_lock_init(&port->outvq_lock); |
c446f8fc AS |
1168 | init_waitqueue_head(&port->waitqueue); |
1169 | ||
1170 | /* Fill the in_vq with buffers so the host can send us data. */ | |
1171 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); | |
1172 | if (!nr_added_bufs) { | |
1173 | dev_err(port->dev, "Error allocating inbufs\n"); | |
1174 | err = -ENOMEM; | |
1175 | goto free_device; | |
1176 | } | |
1177 | ||
1178 | /* | |
1179 | * If we're not using multiport support, this has to be a console port | |
1180 | */ | |
1181 | if (!use_multiport(port->portdev)) { | |
1182 | err = init_port_console(port); | |
1183 | if (err) | |
1184 | goto free_inbufs; | |
1185 | } | |
1186 | ||
1187 | spin_lock_irq(&portdev->ports_lock); | |
1188 | list_add_tail(&port->list, &port->portdev->ports); | |
1189 | spin_unlock_irq(&portdev->ports_lock); | |
1190 | ||
1191 | /* | |
1192 | * Tell the Host we're set so that it can send us various | |
1193 | * configuration parameters for this port (eg, port name, | |
1194 | * caching, whether this is a console port, etc.) | |
1195 | */ | |
1196 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
1197 | ||
1198 | if (pdrvdata.debugfs_dir) { | |
1199 | /* | |
1200 | * Finally, create the debugfs file that we can use to | |
1201 | * inspect a port's state at any time | |
1202 | */ | |
1203 | sprintf(debugfs_name, "vport%up%u", | |
1204 | port->portdev->drv_index, id); | |
1205 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, | |
1206 | pdrvdata.debugfs_dir, | |
1207 | port, | |
1208 | &port_debugfs_ops); | |
1209 | } | |
1210 | return 0; | |
1211 | ||
1212 | free_inbufs: | |
1213 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1214 | free_buf(buf); | |
1215 | free_device: | |
1216 | device_destroy(pdrvdata.class, port->dev->devt); | |
1217 | free_cdev: | |
d22a6989 | 1218 | cdev_del(port->cdev); |
c446f8fc AS |
1219 | free_port: |
1220 | kfree(port); | |
1221 | fail: | |
1222 | /* The host might want to notify management sw about port add failure */ | |
0643e4c6 | 1223 | __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
c446f8fc AS |
1224 | return err; |
1225 | } | |
1226 | ||
b353a6b8 AS |
1227 | /* No users remain, remove all port-specific data. */ |
1228 | static void remove_port(struct kref *kref) | |
1229 | { | |
1230 | struct port *port; | |
1231 | ||
1232 | port = container_of(kref, struct port, kref); | |
1233 | ||
1234 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); | |
1235 | device_destroy(pdrvdata.class, port->dev->devt); | |
1236 | cdev_del(port->cdev); | |
1237 | ||
1238 | kfree(port->name); | |
1239 | ||
1240 | debugfs_remove(port->debugfs_file); | |
1241 | ||
1242 | kfree(port); | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * Port got unplugged. Remove port from portdev's list and drop the | |
1247 | * kref reference. If no userspace has this port opened, it will | |
1248 | * result in immediate removal the port. | |
1249 | */ | |
1250 | static void unplug_port(struct port *port) | |
1f7aa42d | 1251 | { |
a9cdd485 AS |
1252 | struct port_buffer *buf; |
1253 | ||
b353a6b8 AS |
1254 | spin_lock_irq(&port->portdev->ports_lock); |
1255 | list_del(&port->list); | |
1256 | spin_unlock_irq(&port->portdev->ports_lock); | |
1257 | ||
0047634d AS |
1258 | if (port->guest_connected) { |
1259 | port->guest_connected = false; | |
1260 | port->host_connected = false; | |
1261 | wake_up_interruptible(&port->waitqueue); | |
0047634d AS |
1262 | } |
1263 | ||
1f7aa42d AS |
1264 | if (is_console_port(port)) { |
1265 | spin_lock_irq(&pdrvdata_lock); | |
1266 | list_del(&port->cons.list); | |
1267 | spin_unlock_irq(&pdrvdata_lock); | |
69eb9a9f AS |
1268 | #if 0 |
1269 | /* | |
1270 | * hvc_remove() not called as removing one hvc port | |
1271 | * results in other hvc ports getting frozen. | |
1272 | * | |
1273 | * Once this is resolved in hvc, this functionality | |
1274 | * will be enabled. Till that is done, the -EPIPE | |
1275 | * return from get_chars() above will help | |
1276 | * hvc_console.c to clean up on ports we remove here. | |
1277 | */ | |
1f7aa42d | 1278 | hvc_remove(port->cons.hvc); |
69eb9a9f | 1279 | #endif |
1f7aa42d | 1280 | } |
1f7aa42d | 1281 | |
a9cdd485 | 1282 | /* Remove unused data this port might have received. */ |
1f7aa42d | 1283 | discard_port_data(port); |
a9cdd485 | 1284 | |
cdfadfc1 AS |
1285 | reclaim_consumed_buffers(port); |
1286 | ||
a9cdd485 | 1287 | /* Remove buffers we queued up for the Host to send us data in. */ |
505b0451 | 1288 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) |
a9cdd485 AS |
1289 | free_buf(buf); |
1290 | ||
b353a6b8 AS |
1291 | /* |
1292 | * We should just assume the device itself has gone off -- | |
1293 | * else a close on an open port later will try to send out a | |
1294 | * control message. | |
1295 | */ | |
1296 | port->portdev = NULL; | |
d99393ef | 1297 | |
b353a6b8 AS |
1298 | /* |
1299 | * Locks around here are not necessary - a port can't be | |
1300 | * opened after we removed the port struct from ports_list | |
1301 | * above. | |
1302 | */ | |
1303 | kref_put(&port->kref, remove_port); | |
1f7aa42d AS |
1304 | } |
1305 | ||
17634ba2 AS |
1306 | /* Any private messages that the Host and Guest want to share */ |
1307 | static void handle_control_message(struct ports_device *portdev, | |
1308 | struct port_buffer *buf) | |
1309 | { | |
1310 | struct virtio_console_control *cpkt; | |
1311 | struct port *port; | |
431edb8a AS |
1312 | size_t name_size; |
1313 | int err; | |
17634ba2 AS |
1314 | |
1315 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
1316 | ||
1317 | port = find_port_by_id(portdev, cpkt->id); | |
f909f850 | 1318 | if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) { |
17634ba2 AS |
1319 | /* No valid header at start of buffer. Drop it. */ |
1320 | dev_dbg(&portdev->vdev->dev, | |
1321 | "Invalid index %u in control packet\n", cpkt->id); | |
1322 | return; | |
1323 | } | |
1324 | ||
1325 | switch (cpkt->event) { | |
f909f850 AS |
1326 | case VIRTIO_CONSOLE_PORT_ADD: |
1327 | if (port) { | |
1d05160b AS |
1328 | dev_dbg(&portdev->vdev->dev, |
1329 | "Port %u already added\n", port->id); | |
f909f850 AS |
1330 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
1331 | break; | |
1332 | } | |
1333 | if (cpkt->id >= portdev->config.max_nr_ports) { | |
1334 | dev_warn(&portdev->vdev->dev, | |
1335 | "Request for adding port with out-of-bound id %u, max. supported id: %u\n", | |
1336 | cpkt->id, portdev->config.max_nr_ports - 1); | |
1337 | break; | |
1338 | } | |
1339 | add_port(portdev, cpkt->id); | |
1340 | break; | |
1341 | case VIRTIO_CONSOLE_PORT_REMOVE: | |
b353a6b8 | 1342 | unplug_port(port); |
f909f850 | 1343 | break; |
17634ba2 AS |
1344 | case VIRTIO_CONSOLE_CONSOLE_PORT: |
1345 | if (!cpkt->value) | |
1346 | break; | |
1347 | if (is_console_port(port)) | |
1348 | break; | |
1349 | ||
1350 | init_port_console(port); | |
1351 | /* | |
1352 | * Could remove the port here in case init fails - but | |
1353 | * have to notify the host first. | |
1354 | */ | |
1355 | break; | |
8345adbf AS |
1356 | case VIRTIO_CONSOLE_RESIZE: { |
1357 | struct { | |
1358 | __u16 rows; | |
1359 | __u16 cols; | |
1360 | } size; | |
1361 | ||
17634ba2 AS |
1362 | if (!is_console_port(port)) |
1363 | break; | |
8345adbf AS |
1364 | |
1365 | memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), | |
1366 | sizeof(size)); | |
1367 | set_console_size(port, size.rows, size.cols); | |
1368 | ||
17634ba2 AS |
1369 | port->cons.hvc->irq_requested = 1; |
1370 | resize_console(port); | |
1371 | break; | |
8345adbf | 1372 | } |
2030fa49 AS |
1373 | case VIRTIO_CONSOLE_PORT_OPEN: |
1374 | port->host_connected = cpkt->value; | |
1375 | wake_up_interruptible(&port->waitqueue); | |
cdfadfc1 AS |
1376 | /* |
1377 | * If the host port got closed and the host had any | |
1378 | * unconsumed buffers, we'll be able to reclaim them | |
1379 | * now. | |
1380 | */ | |
1381 | spin_lock_irq(&port->outvq_lock); | |
1382 | reclaim_consumed_buffers(port); | |
1383 | spin_unlock_irq(&port->outvq_lock); | |
3eae0ade AS |
1384 | |
1385 | /* | |
1386 | * If the guest is connected, it'll be interested in | |
1387 | * knowing the host connection state changed. | |
1388 | */ | |
1389 | send_sigio_to_port(port); | |
2030fa49 | 1390 | break; |
431edb8a AS |
1391 | case VIRTIO_CONSOLE_PORT_NAME: |
1392 | /* | |
1393 | * Skip the size of the header and the cpkt to get the size | |
1394 | * of the name that was sent | |
1395 | */ | |
1396 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
1397 | ||
1398 | port->name = kmalloc(name_size, GFP_KERNEL); | |
1399 | if (!port->name) { | |
1400 | dev_err(port->dev, | |
1401 | "Not enough space to store port name\n"); | |
1402 | break; | |
1403 | } | |
1404 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
1405 | name_size - 1); | |
1406 | port->name[name_size - 1] = 0; | |
1407 | ||
1408 | /* | |
1409 | * Since we only have one sysfs attribute, 'name', | |
1410 | * create it only if we have a name for the port. | |
1411 | */ | |
1412 | err = sysfs_create_group(&port->dev->kobj, | |
1413 | &port_attribute_group); | |
ec64213c | 1414 | if (err) { |
431edb8a AS |
1415 | dev_err(port->dev, |
1416 | "Error %d creating sysfs device attributes\n", | |
1417 | err); | |
ec64213c AS |
1418 | } else { |
1419 | /* | |
1420 | * Generate a udev event so that appropriate | |
1421 | * symlinks can be created based on udev | |
1422 | * rules. | |
1423 | */ | |
1424 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
1425 | } | |
431edb8a | 1426 | break; |
17634ba2 AS |
1427 | } |
1428 | } | |
1429 | ||
1430 | static void control_work_handler(struct work_struct *work) | |
1431 | { | |
1432 | struct ports_device *portdev; | |
1433 | struct virtqueue *vq; | |
1434 | struct port_buffer *buf; | |
1435 | unsigned int len; | |
1436 | ||
1437 | portdev = container_of(work, struct ports_device, control_work); | |
1438 | vq = portdev->c_ivq; | |
1439 | ||
1440 | spin_lock(&portdev->cvq_lock); | |
505b0451 | 1441 | while ((buf = virtqueue_get_buf(vq, &len))) { |
17634ba2 AS |
1442 | spin_unlock(&portdev->cvq_lock); |
1443 | ||
1444 | buf->len = len; | |
1445 | buf->offset = 0; | |
1446 | ||
1447 | handle_control_message(portdev, buf); | |
1448 | ||
1449 | spin_lock(&portdev->cvq_lock); | |
1450 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
1451 | dev_warn(&portdev->vdev->dev, | |
1452 | "Error adding buffer to queue\n"); | |
1453 | free_buf(buf); | |
1454 | } | |
1455 | } | |
1456 | spin_unlock(&portdev->cvq_lock); | |
1457 | } | |
1458 | ||
1459 | static void in_intr(struct virtqueue *vq) | |
1460 | { | |
1461 | struct port *port; | |
1462 | unsigned long flags; | |
1463 | ||
1464 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1465 | if (!port) | |
1466 | return; | |
1467 | ||
1468 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d6933561 AS |
1469 | if (!port->inbuf) |
1470 | port->inbuf = get_inbuf(port); | |
17634ba2 | 1471 | |
88f251ac AS |
1472 | /* |
1473 | * Don't queue up data when port is closed. This condition | |
1474 | * can be reached when a console port is not yet connected (no | |
1475 | * tty is spawned) and the host sends out data to console | |
1476 | * ports. For generic serial ports, the host won't | |
1477 | * (shouldn't) send data till the guest is connected. | |
1478 | */ | |
1479 | if (!port->guest_connected) | |
1480 | discard_port_data(port); | |
1481 | ||
17634ba2 AS |
1482 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1483 | ||
2030fa49 AS |
1484 | wake_up_interruptible(&port->waitqueue); |
1485 | ||
17634ba2 AS |
1486 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1487 | hvc_kick(); | |
1488 | } | |
1489 | ||
1490 | static void control_intr(struct virtqueue *vq) | |
1491 | { | |
1492 | struct ports_device *portdev; | |
1493 | ||
1494 | portdev = vq->vdev->priv; | |
1495 | schedule_work(&portdev->control_work); | |
1496 | } | |
1497 | ||
7f5d810d AS |
1498 | static void config_intr(struct virtio_device *vdev) |
1499 | { | |
1500 | struct ports_device *portdev; | |
1501 | ||
1502 | portdev = vdev->priv; | |
99f905f8 | 1503 | |
4038f5b7 | 1504 | if (!use_multiport(portdev)) { |
9778829c AS |
1505 | struct port *port; |
1506 | u16 rows, cols; | |
1507 | ||
1508 | vdev->config->get(vdev, | |
1509 | offsetof(struct virtio_console_config, cols), | |
1510 | &cols, sizeof(u16)); | |
1511 | vdev->config->get(vdev, | |
1512 | offsetof(struct virtio_console_config, rows), | |
1513 | &rows, sizeof(u16)); | |
1514 | ||
1515 | port = find_port_by_id(portdev, 0); | |
1516 | set_console_size(port, rows, cols); | |
1517 | ||
4038f5b7 AS |
1518 | /* |
1519 | * We'll use this way of resizing only for legacy | |
1520 | * support. For newer userspace | |
1521 | * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages | |
1522 | * to indicate console size changes so that it can be | |
1523 | * done per-port. | |
1524 | */ | |
9778829c | 1525 | resize_console(port); |
4038f5b7 | 1526 | } |
7f5d810d AS |
1527 | } |
1528 | ||
2658a79a AS |
1529 | static int init_vqs(struct ports_device *portdev) |
1530 | { | |
1531 | vq_callback_t **io_callbacks; | |
1532 | char **io_names; | |
1533 | struct virtqueue **vqs; | |
17634ba2 | 1534 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1535 | int err; |
1536 | ||
17634ba2 AS |
1537 | nr_ports = portdev->config.max_nr_ports; |
1538 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1539 | |
1540 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
1541 | if (!vqs) { | |
1542 | err = -ENOMEM; | |
1543 | goto fail; | |
1544 | } | |
1545 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); | |
1546 | if (!io_callbacks) { | |
1547 | err = -ENOMEM; | |
1548 | goto free_vqs; | |
1549 | } | |
1550 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); | |
1551 | if (!io_names) { | |
1552 | err = -ENOMEM; | |
1553 | goto free_callbacks; | |
1554 | } | |
1555 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1556 | GFP_KERNEL); | |
1557 | if (!portdev->in_vqs) { | |
1558 | err = -ENOMEM; | |
1559 | goto free_names; | |
1560 | } | |
1561 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1562 | GFP_KERNEL); | |
1563 | if (!portdev->out_vqs) { | |
1564 | err = -ENOMEM; | |
1565 | goto free_invqs; | |
1566 | } | |
1567 | ||
17634ba2 AS |
1568 | /* |
1569 | * For backward compat (newer host but older guest), the host | |
1570 | * spawns a console port first and also inits the vqs for port | |
1571 | * 0 before others. | |
1572 | */ | |
1573 | j = 0; | |
1574 | io_callbacks[j] = in_intr; | |
1575 | io_callbacks[j + 1] = NULL; | |
1576 | io_names[j] = "input"; | |
1577 | io_names[j + 1] = "output"; | |
1578 | j += 2; | |
1579 | ||
1580 | if (use_multiport(portdev)) { | |
1581 | io_callbacks[j] = control_intr; | |
1582 | io_callbacks[j + 1] = NULL; | |
1583 | io_names[j] = "control-i"; | |
1584 | io_names[j + 1] = "control-o"; | |
1585 | ||
1586 | for (i = 1; i < nr_ports; i++) { | |
1587 | j += 2; | |
1588 | io_callbacks[j] = in_intr; | |
1589 | io_callbacks[j + 1] = NULL; | |
1590 | io_names[j] = "input"; | |
1591 | io_names[j + 1] = "output"; | |
1592 | } | |
1593 | } | |
2658a79a AS |
1594 | /* Find the queues. */ |
1595 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1596 | io_callbacks, | |
1597 | (const char **)io_names); | |
1598 | if (err) | |
1599 | goto free_outvqs; | |
1600 | ||
17634ba2 | 1601 | j = 0; |
2658a79a AS |
1602 | portdev->in_vqs[0] = vqs[0]; |
1603 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1604 | j += 2; |
1605 | if (use_multiport(portdev)) { | |
1606 | portdev->c_ivq = vqs[j]; | |
1607 | portdev->c_ovq = vqs[j + 1]; | |
1608 | ||
1609 | for (i = 1; i < nr_ports; i++) { | |
1610 | j += 2; | |
1611 | portdev->in_vqs[i] = vqs[j]; | |
1612 | portdev->out_vqs[i] = vqs[j + 1]; | |
1613 | } | |
1614 | } | |
2658a79a AS |
1615 | kfree(io_callbacks); |
1616 | kfree(io_names); | |
1617 | kfree(vqs); | |
1618 | ||
1619 | return 0; | |
1620 | ||
1621 | free_names: | |
1622 | kfree(io_names); | |
1623 | free_callbacks: | |
1624 | kfree(io_callbacks); | |
1625 | free_outvqs: | |
1626 | kfree(portdev->out_vqs); | |
1627 | free_invqs: | |
1628 | kfree(portdev->in_vqs); | |
1629 | free_vqs: | |
1630 | kfree(vqs); | |
1631 | fail: | |
1632 | return err; | |
1633 | } | |
1634 | ||
fb08bd27 AS |
1635 | static const struct file_operations portdev_fops = { |
1636 | .owner = THIS_MODULE, | |
1637 | }; | |
1638 | ||
1c85bf35 AS |
1639 | /* |
1640 | * Once we're further in boot, we get probed like any other virtio | |
1641 | * device. | |
17634ba2 AS |
1642 | * |
1643 | * If the host also supports multiple console ports, we check the | |
1644 | * config space to see how many ports the host has spawned. We | |
1645 | * initialize each port found. | |
1c85bf35 AS |
1646 | */ |
1647 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1648 | { | |
1c85bf35 AS |
1649 | struct ports_device *portdev; |
1650 | int err; | |
17634ba2 | 1651 | bool multiport; |
1c85bf35 AS |
1652 | |
1653 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1654 | if (!portdev) { | |
1655 | err = -ENOMEM; | |
1656 | goto fail; | |
1657 | } | |
1658 | ||
1659 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1660 | portdev->vdev = vdev; | |
1661 | vdev->priv = portdev; | |
1662 | ||
fb08bd27 AS |
1663 | spin_lock_irq(&pdrvdata_lock); |
1664 | portdev->drv_index = pdrvdata.index++; | |
1665 | spin_unlock_irq(&pdrvdata_lock); | |
1666 | ||
1667 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1668 | &portdev_fops); | |
1669 | if (portdev->chr_major < 0) { | |
1670 | dev_err(&vdev->dev, | |
1671 | "Error %d registering chrdev for device %u\n", | |
1672 | portdev->chr_major, portdev->drv_index); | |
1673 | err = portdev->chr_major; | |
1674 | goto free; | |
1675 | } | |
1676 | ||
17634ba2 | 1677 | multiport = false; |
17634ba2 AS |
1678 | portdev->config.max_nr_ports = 1; |
1679 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { | |
1680 | multiport = true; | |
1681 | vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; | |
1682 | ||
b99fa815 AS |
1683 | vdev->config->get(vdev, offsetof(struct virtio_console_config, |
1684 | max_nr_ports), | |
17634ba2 AS |
1685 | &portdev->config.max_nr_ports, |
1686 | sizeof(portdev->config.max_nr_ports)); | |
17634ba2 AS |
1687 | } |
1688 | ||
1689 | /* Let the Host know we support multiple ports.*/ | |
1690 | vdev->config->finalize_features(vdev); | |
1691 | ||
2658a79a AS |
1692 | err = init_vqs(portdev); |
1693 | if (err < 0) { | |
1694 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1695 | goto free_chrdev; |
2658a79a | 1696 | } |
1c85bf35 | 1697 | |
17634ba2 AS |
1698 | spin_lock_init(&portdev->ports_lock); |
1699 | INIT_LIST_HEAD(&portdev->ports); | |
1700 | ||
1701 | if (multiport) { | |
335a64a5 AS |
1702 | unsigned int nr_added_bufs; |
1703 | ||
17634ba2 AS |
1704 | spin_lock_init(&portdev->cvq_lock); |
1705 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
1706 | ||
335a64a5 AS |
1707 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
1708 | if (!nr_added_bufs) { | |
22a29eac AS |
1709 | dev_err(&vdev->dev, |
1710 | "Error allocating buffers for control queue\n"); | |
1711 | err = -ENOMEM; | |
1712 | goto free_vqs; | |
1713 | } | |
1d05160b AS |
1714 | } else { |
1715 | /* | |
1716 | * For backward compatibility: Create a console port | |
1717 | * if we're running on older host. | |
1718 | */ | |
1719 | add_port(portdev, 0); | |
17634ba2 AS |
1720 | } |
1721 | ||
6bdf2afd AS |
1722 | spin_lock_irq(&pdrvdata_lock); |
1723 | list_add_tail(&portdev->list, &pdrvdata.portdevs); | |
1724 | spin_unlock_irq(&pdrvdata_lock); | |
1725 | ||
f909f850 AS |
1726 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
1727 | VIRTIO_CONSOLE_DEVICE_READY, 1); | |
31610434 RR |
1728 | return 0; |
1729 | ||
22a29eac | 1730 | free_vqs: |
0643e4c6 JL |
1731 | /* The host might want to notify mgmt sw about device add failure */ |
1732 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, | |
1733 | VIRTIO_CONSOLE_DEVICE_READY, 0); | |
22a29eac AS |
1734 | vdev->config->del_vqs(vdev); |
1735 | kfree(portdev->in_vqs); | |
1736 | kfree(portdev->out_vqs); | |
fb08bd27 AS |
1737 | free_chrdev: |
1738 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1739 | free: |
1c85bf35 | 1740 | kfree(portdev); |
31610434 RR |
1741 | fail: |
1742 | return err; | |
1743 | } | |
1744 | ||
7177876f AS |
1745 | static void virtcons_remove(struct virtio_device *vdev) |
1746 | { | |
1747 | struct ports_device *portdev; | |
1748 | struct port *port, *port2; | |
7177876f AS |
1749 | |
1750 | portdev = vdev->priv; | |
1751 | ||
6bdf2afd AS |
1752 | spin_lock_irq(&pdrvdata_lock); |
1753 | list_del(&portdev->list); | |
1754 | spin_unlock_irq(&pdrvdata_lock); | |
1755 | ||
02238959 AS |
1756 | /* Disable interrupts for vqs */ |
1757 | vdev->config->reset(vdev); | |
1758 | /* Finish up work that's lined up */ | |
7177876f | 1759 | cancel_work_sync(&portdev->control_work); |
7177876f AS |
1760 | |
1761 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
b353a6b8 | 1762 | unplug_port(port); |
7177876f AS |
1763 | |
1764 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
1765 | ||
e062013c AS |
1766 | /* |
1767 | * When yanking out a device, we immediately lose the | |
1768 | * (device-side) queues. So there's no point in keeping the | |
1769 | * guest side around till we drop our final reference. This | |
1770 | * also means that any ports which are in an open state will | |
1771 | * have to just stop using the port, as the vqs are going | |
1772 | * away. | |
1773 | */ | |
96eb872b AS |
1774 | if (use_multiport(portdev)) { |
1775 | struct port_buffer *buf; | |
1776 | unsigned int len; | |
7177876f | 1777 | |
96eb872b AS |
1778 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) |
1779 | free_buf(buf); | |
1780 | ||
1781 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) | |
1782 | free_buf(buf); | |
1783 | } | |
7177876f AS |
1784 | |
1785 | vdev->config->del_vqs(vdev); | |
1786 | kfree(portdev->in_vqs); | |
1787 | kfree(portdev->out_vqs); | |
1788 | ||
1789 | kfree(portdev); | |
1790 | } | |
1791 | ||
31610434 RR |
1792 | static struct virtio_device_id id_table[] = { |
1793 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1794 | { 0 }, | |
1795 | }; | |
1796 | ||
c2983458 CB |
1797 | static unsigned int features[] = { |
1798 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 1799 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1800 | }; |
1801 | ||
31610434 | 1802 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1803 | .feature_table = features, |
1804 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1805 | .driver.name = KBUILD_MODNAME, |
1806 | .driver.owner = THIS_MODULE, | |
1807 | .id_table = id_table, | |
1808 | .probe = virtcons_probe, | |
7177876f | 1809 | .remove = virtcons_remove, |
7f5d810d | 1810 | .config_changed = config_intr, |
31610434 RR |
1811 | }; |
1812 | ||
1813 | static int __init init(void) | |
1814 | { | |
fb08bd27 AS |
1815 | int err; |
1816 | ||
1817 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
1818 | if (IS_ERR(pdrvdata.class)) { | |
1819 | err = PTR_ERR(pdrvdata.class); | |
1820 | pr_err("Error %d creating virtio-ports class\n", err); | |
1821 | return err; | |
1822 | } | |
d99393ef AS |
1823 | |
1824 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
1825 | if (!pdrvdata.debugfs_dir) { | |
1826 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
1827 | PTR_ERR(pdrvdata.debugfs_dir)); | |
1828 | } | |
38edf58d | 1829 | INIT_LIST_HEAD(&pdrvdata.consoles); |
6bdf2afd | 1830 | INIT_LIST_HEAD(&pdrvdata.portdevs); |
38edf58d | 1831 | |
31610434 RR |
1832 | return register_virtio_driver(&virtio_console); |
1833 | } | |
7177876f AS |
1834 | |
1835 | static void __exit fini(void) | |
1836 | { | |
1837 | unregister_virtio_driver(&virtio_console); | |
1838 | ||
1839 | class_destroy(pdrvdata.class); | |
1840 | if (pdrvdata.debugfs_dir) | |
1841 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
1842 | } | |
31610434 | 1843 | module_init(init); |
7177876f | 1844 | module_exit(fini); |
31610434 RR |
1845 | |
1846 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1847 | MODULE_DESCRIPTION("Virtio console driver"); | |
1848 | MODULE_LICENSE("GPL"); |