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Commit | Line | Data |
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a23ea924 RR |
1 | /* |
2 | * Copyright (C) 2006, 2007, 2009 Rusty Russell, IBM Corporation | |
5084f893 AS |
3 | * Copyright (C) 2009, 2010, 2011 Red Hat, Inc. |
4 | * Copyright (C) 2009, 2010, 2011 Amit Shah <amit.shah@redhat.com> | |
31610434 RR |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
fb08bd27 | 20 | #include <linux/cdev.h> |
d99393ef | 21 | #include <linux/debugfs.h> |
fb08bd27 | 22 | #include <linux/device.h> |
31610434 | 23 | #include <linux/err.h> |
2030fa49 | 24 | #include <linux/fs.h> |
31610434 | 25 | #include <linux/init.h> |
38edf58d | 26 | #include <linux/list.h> |
2030fa49 AS |
27 | #include <linux/poll.h> |
28 | #include <linux/sched.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
38edf58d | 30 | #include <linux/spinlock.h> |
31610434 RR |
31 | #include <linux/virtio.h> |
32 | #include <linux/virtio_console.h> | |
2030fa49 | 33 | #include <linux/wait.h> |
17634ba2 | 34 | #include <linux/workqueue.h> |
51df0acc | 35 | #include "../tty/hvc/hvc_console.h" |
31610434 | 36 | |
38edf58d AS |
37 | /* |
38 | * This is a global struct for storing common data for all the devices | |
39 | * this driver handles. | |
40 | * | |
41 | * Mainly, it has a linked list for all the consoles in one place so | |
42 | * that callbacks from hvc for get_chars(), put_chars() work properly | |
43 | * across multiple devices and multiple ports per device. | |
44 | */ | |
45 | struct ports_driver_data { | |
fb08bd27 AS |
46 | /* Used for registering chardevs */ |
47 | struct class *class; | |
48 | ||
d99393ef AS |
49 | /* Used for exporting per-port information to debugfs */ |
50 | struct dentry *debugfs_dir; | |
51 | ||
6bdf2afd AS |
52 | /* List of all the devices we're handling */ |
53 | struct list_head portdevs; | |
54 | ||
fb08bd27 AS |
55 | /* Number of devices this driver is handling */ |
56 | unsigned int index; | |
57 | ||
d8a02bd5 RR |
58 | /* |
59 | * This is used to keep track of the number of hvc consoles | |
60 | * spawned by this driver. This number is given as the first | |
61 | * argument to hvc_alloc(). To correctly map an initial | |
62 | * console spawned via hvc_instantiate to the console being | |
63 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
64 | * | |
65 | * We also just assume the first console being initialised was | |
66 | * the first one that got used as the initial console. | |
67 | */ | |
68 | unsigned int next_vtermno; | |
69 | ||
38edf58d AS |
70 | /* All the console devices handled by this driver */ |
71 | struct list_head consoles; | |
72 | }; | |
73 | static struct ports_driver_data pdrvdata; | |
74 | ||
75 | DEFINE_SPINLOCK(pdrvdata_lock); | |
76 | ||
4f23c573 AS |
77 | /* This struct holds information that's relevant only for console ports */ |
78 | struct console { | |
79 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
80 | struct list_head list; | |
81 | ||
82 | /* The hvc device associated with this console port */ | |
83 | struct hvc_struct *hvc; | |
84 | ||
9778829c AS |
85 | /* The size of the console */ |
86 | struct winsize ws; | |
87 | ||
4f23c573 AS |
88 | /* |
89 | * This number identifies the number that we used to register | |
90 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
91 | * number passed on by the hvc callbacks to us to | |
92 | * differentiate between the other console ports handled by | |
93 | * this driver | |
94 | */ | |
95 | u32 vtermno; | |
96 | }; | |
97 | ||
fdb9a054 AS |
98 | struct port_buffer { |
99 | char *buf; | |
100 | ||
101 | /* size of the buffer in *buf above */ | |
102 | size_t size; | |
103 | ||
104 | /* used length of the buffer */ | |
105 | size_t len; | |
106 | /* offset in the buf from which to consume data */ | |
107 | size_t offset; | |
108 | }; | |
109 | ||
17634ba2 AS |
110 | /* |
111 | * This is a per-device struct that stores data common to all the | |
112 | * ports for that device (vdev->priv). | |
113 | */ | |
114 | struct ports_device { | |
6bdf2afd AS |
115 | /* Next portdev in the list, head is in the pdrvdata struct */ |
116 | struct list_head list; | |
117 | ||
17634ba2 AS |
118 | /* |
119 | * Workqueue handlers where we process deferred work after | |
120 | * notification | |
121 | */ | |
122 | struct work_struct control_work; | |
123 | ||
124 | struct list_head ports; | |
125 | ||
126 | /* To protect the list of ports */ | |
127 | spinlock_t ports_lock; | |
128 | ||
129 | /* To protect the vq operations for the control channel */ | |
130 | spinlock_t cvq_lock; | |
131 | ||
132 | /* The current config space is stored here */ | |
b99fa815 | 133 | struct virtio_console_config config; |
17634ba2 AS |
134 | |
135 | /* The virtio device we're associated with */ | |
136 | struct virtio_device *vdev; | |
137 | ||
138 | /* | |
139 | * A couple of virtqueues for the control channel: one for | |
140 | * guest->host transfers, one for host->guest transfers | |
141 | */ | |
142 | struct virtqueue *c_ivq, *c_ovq; | |
143 | ||
144 | /* Array of per-port IO virtqueues */ | |
145 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
146 | |
147 | /* Used for numbering devices for sysfs and debugfs */ | |
148 | unsigned int drv_index; | |
149 | ||
150 | /* Major number for this device. Ports will be created as minors. */ | |
151 | int chr_major; | |
17634ba2 AS |
152 | }; |
153 | ||
1c85bf35 | 154 | /* This struct holds the per-port data */ |
21206ede | 155 | struct port { |
17634ba2 AS |
156 | /* Next port in the list, head is in the ports_device */ |
157 | struct list_head list; | |
158 | ||
1c85bf35 AS |
159 | /* Pointer to the parent virtio_console device */ |
160 | struct ports_device *portdev; | |
fdb9a054 AS |
161 | |
162 | /* The current buffer from which data has to be fed to readers */ | |
163 | struct port_buffer *inbuf; | |
21206ede | 164 | |
203baab8 AS |
165 | /* |
166 | * To protect the operations on the in_vq associated with this | |
167 | * port. Has to be a spinlock because it can be called from | |
168 | * interrupt context (get_char()). | |
169 | */ | |
170 | spinlock_t inbuf_lock; | |
171 | ||
cdfadfc1 AS |
172 | /* Protect the operations on the out_vq. */ |
173 | spinlock_t outvq_lock; | |
174 | ||
1c85bf35 AS |
175 | /* The IO vqs for this port */ |
176 | struct virtqueue *in_vq, *out_vq; | |
177 | ||
d99393ef AS |
178 | /* File in the debugfs directory that exposes this port's information */ |
179 | struct dentry *debugfs_file; | |
180 | ||
4f23c573 AS |
181 | /* |
182 | * The entries in this struct will be valid if this port is | |
183 | * hooked up to an hvc console | |
184 | */ | |
185 | struct console cons; | |
17634ba2 | 186 | |
fb08bd27 | 187 | /* Each port associates with a separate char device */ |
d22a6989 | 188 | struct cdev *cdev; |
fb08bd27 AS |
189 | struct device *dev; |
190 | ||
b353a6b8 AS |
191 | /* Reference-counting to handle port hot-unplugs and file operations */ |
192 | struct kref kref; | |
193 | ||
2030fa49 AS |
194 | /* A waitqueue for poll() or blocking read operations */ |
195 | wait_queue_head_t waitqueue; | |
196 | ||
431edb8a AS |
197 | /* The 'name' of the port that we expose via sysfs properties */ |
198 | char *name; | |
199 | ||
3eae0ade AS |
200 | /* We can notify apps of host connect / disconnect events via SIGIO */ |
201 | struct fasync_struct *async_queue; | |
202 | ||
17634ba2 AS |
203 | /* The 'id' to identify the port with the Host */ |
204 | u32 id; | |
2030fa49 | 205 | |
cdfadfc1 AS |
206 | bool outvq_full; |
207 | ||
2030fa49 AS |
208 | /* Is the host device open */ |
209 | bool host_connected; | |
3c7969cc AS |
210 | |
211 | /* We should allow only one process to open a port */ | |
212 | bool guest_connected; | |
21206ede | 213 | }; |
31610434 | 214 | |
971f3390 RR |
215 | /* This is the very early arch-specified put chars function. */ |
216 | static int (*early_put_chars)(u32, const char *, int); | |
217 | ||
38edf58d AS |
218 | static struct port *find_port_by_vtermno(u32 vtermno) |
219 | { | |
220 | struct port *port; | |
4f23c573 | 221 | struct console *cons; |
38edf58d AS |
222 | unsigned long flags; |
223 | ||
224 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
225 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
226 | if (cons->vtermno == vtermno) { | |
227 | port = container_of(cons, struct port, cons); | |
38edf58d | 228 | goto out; |
4f23c573 | 229 | } |
38edf58d AS |
230 | } |
231 | port = NULL; | |
232 | out: | |
233 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
234 | return port; | |
235 | } | |
236 | ||
04950cdf AS |
237 | static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, |
238 | dev_t dev) | |
239 | { | |
240 | struct port *port; | |
241 | unsigned long flags; | |
242 | ||
243 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
244 | list_for_each_entry(port, &portdev->ports, list) | |
d22a6989 | 245 | if (port->cdev->dev == dev) |
04950cdf AS |
246 | goto out; |
247 | port = NULL; | |
248 | out: | |
249 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
250 | ||
251 | return port; | |
252 | } | |
253 | ||
254 | static struct port *find_port_by_devt(dev_t dev) | |
255 | { | |
256 | struct ports_device *portdev; | |
257 | struct port *port; | |
258 | unsigned long flags; | |
259 | ||
260 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
261 | list_for_each_entry(portdev, &pdrvdata.portdevs, list) { | |
262 | port = find_port_by_devt_in_portdev(portdev, dev); | |
263 | if (port) | |
264 | goto out; | |
265 | } | |
266 | port = NULL; | |
267 | out: | |
268 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
269 | return port; | |
270 | } | |
271 | ||
17634ba2 AS |
272 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
273 | { | |
274 | struct port *port; | |
275 | unsigned long flags; | |
276 | ||
277 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
278 | list_for_each_entry(port, &portdev->ports, list) | |
279 | if (port->id == id) | |
280 | goto out; | |
281 | port = NULL; | |
282 | out: | |
283 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
284 | ||
285 | return port; | |
286 | } | |
287 | ||
203baab8 AS |
288 | static struct port *find_port_by_vq(struct ports_device *portdev, |
289 | struct virtqueue *vq) | |
290 | { | |
291 | struct port *port; | |
203baab8 AS |
292 | unsigned long flags; |
293 | ||
17634ba2 AS |
294 | spin_lock_irqsave(&portdev->ports_lock, flags); |
295 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
296 | if (port->in_vq == vq || port->out_vq == vq) |
297 | goto out; | |
203baab8 AS |
298 | port = NULL; |
299 | out: | |
17634ba2 | 300 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
301 | return port; |
302 | } | |
303 | ||
17634ba2 AS |
304 | static bool is_console_port(struct port *port) |
305 | { | |
306 | if (port->cons.hvc) | |
307 | return true; | |
308 | return false; | |
309 | } | |
310 | ||
311 | static inline bool use_multiport(struct ports_device *portdev) | |
312 | { | |
313 | /* | |
314 | * This condition can be true when put_chars is called from | |
315 | * early_init | |
316 | */ | |
317 | if (!portdev->vdev) | |
318 | return 0; | |
319 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
320 | } | |
321 | ||
fdb9a054 AS |
322 | static void free_buf(struct port_buffer *buf) |
323 | { | |
324 | kfree(buf->buf); | |
325 | kfree(buf); | |
326 | } | |
327 | ||
328 | static struct port_buffer *alloc_buf(size_t buf_size) | |
329 | { | |
330 | struct port_buffer *buf; | |
331 | ||
332 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
333 | if (!buf) | |
334 | goto fail; | |
335 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
336 | if (!buf->buf) | |
337 | goto free_buf; | |
338 | buf->len = 0; | |
339 | buf->offset = 0; | |
340 | buf->size = buf_size; | |
341 | return buf; | |
342 | ||
343 | free_buf: | |
344 | kfree(buf); | |
345 | fail: | |
346 | return NULL; | |
347 | } | |
348 | ||
a3cde449 AS |
349 | /* Callers should take appropriate locks */ |
350 | static void *get_inbuf(struct port *port) | |
351 | { | |
352 | struct port_buffer *buf; | |
353 | struct virtqueue *vq; | |
354 | unsigned int len; | |
355 | ||
356 | vq = port->in_vq; | |
505b0451 | 357 | buf = virtqueue_get_buf(vq, &len); |
a3cde449 AS |
358 | if (buf) { |
359 | buf->len = len; | |
360 | buf->offset = 0; | |
361 | } | |
362 | return buf; | |
363 | } | |
364 | ||
e27b5198 AS |
365 | /* |
366 | * Create a scatter-gather list representing our input buffer and put | |
367 | * it in the queue. | |
368 | * | |
369 | * Callers should take appropriate locks. | |
370 | */ | |
203baab8 | 371 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
372 | { |
373 | struct scatterlist sg[1]; | |
203baab8 | 374 | int ret; |
1c85bf35 | 375 | |
e27b5198 AS |
376 | sg_init_one(sg, buf->buf, buf->size); |
377 | ||
505b0451 MT |
378 | ret = virtqueue_add_buf(vq, sg, 0, 1, buf); |
379 | virtqueue_kick(vq); | |
203baab8 AS |
380 | return ret; |
381 | } | |
382 | ||
88f251ac AS |
383 | /* Discard any unread data this port has. Callers lockers. */ |
384 | static void discard_port_data(struct port *port) | |
385 | { | |
386 | struct port_buffer *buf; | |
387 | struct virtqueue *vq; | |
388 | unsigned int len; | |
d6933561 | 389 | int ret; |
88f251ac | 390 | |
d7a62cd0 AS |
391 | if (!port->portdev) { |
392 | /* Device has been unplugged. vqs are already gone. */ | |
393 | return; | |
394 | } | |
88f251ac AS |
395 | vq = port->in_vq; |
396 | if (port->inbuf) | |
397 | buf = port->inbuf; | |
398 | else | |
505b0451 | 399 | buf = virtqueue_get_buf(vq, &len); |
88f251ac | 400 | |
d6933561 AS |
401 | ret = 0; |
402 | while (buf) { | |
403 | if (add_inbuf(vq, buf) < 0) { | |
404 | ret++; | |
405 | free_buf(buf); | |
406 | } | |
505b0451 | 407 | buf = virtqueue_get_buf(vq, &len); |
88f251ac | 408 | } |
88f251ac | 409 | port->inbuf = NULL; |
d6933561 AS |
410 | if (ret) |
411 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", | |
412 | ret); | |
88f251ac AS |
413 | } |
414 | ||
203baab8 AS |
415 | static bool port_has_data(struct port *port) |
416 | { | |
417 | unsigned long flags; | |
418 | bool ret; | |
419 | ||
203baab8 | 420 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 421 | if (port->inbuf) { |
203baab8 | 422 | ret = true; |
d6933561 AS |
423 | goto out; |
424 | } | |
425 | port->inbuf = get_inbuf(port); | |
426 | if (port->inbuf) { | |
427 | ret = true; | |
428 | goto out; | |
429 | } | |
430 | ret = false; | |
431 | out: | |
203baab8 | 432 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
433 | return ret; |
434 | } | |
435 | ||
3425e706 AS |
436 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
437 | unsigned int event, unsigned int value) | |
17634ba2 AS |
438 | { |
439 | struct scatterlist sg[1]; | |
440 | struct virtio_console_control cpkt; | |
441 | struct virtqueue *vq; | |
604b2ad7 | 442 | unsigned int len; |
17634ba2 | 443 | |
3425e706 | 444 | if (!use_multiport(portdev)) |
17634ba2 AS |
445 | return 0; |
446 | ||
3425e706 | 447 | cpkt.id = port_id; |
17634ba2 AS |
448 | cpkt.event = event; |
449 | cpkt.value = value; | |
450 | ||
3425e706 | 451 | vq = portdev->c_ovq; |
17634ba2 AS |
452 | |
453 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
505b0451 MT |
454 | if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt) >= 0) { |
455 | virtqueue_kick(vq); | |
456 | while (!virtqueue_get_buf(vq, &len)) | |
17634ba2 AS |
457 | cpu_relax(); |
458 | } | |
459 | return 0; | |
460 | } | |
461 | ||
3425e706 AS |
462 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
463 | unsigned int value) | |
464 | { | |
84ec06c5 AS |
465 | /* Did the port get unplugged before userspace closed it? */ |
466 | if (port->portdev) | |
467 | return __send_control_msg(port->portdev, port->id, event, value); | |
468 | return 0; | |
3425e706 AS |
469 | } |
470 | ||
cdfadfc1 AS |
471 | /* Callers must take the port->outvq_lock */ |
472 | static void reclaim_consumed_buffers(struct port *port) | |
473 | { | |
474 | void *buf; | |
475 | unsigned int len; | |
476 | ||
d7a62cd0 AS |
477 | if (!port->portdev) { |
478 | /* Device has been unplugged. vqs are already gone. */ | |
479 | return; | |
480 | } | |
cdfadfc1 AS |
481 | while ((buf = virtqueue_get_buf(port->out_vq, &len))) { |
482 | kfree(buf); | |
483 | port->outvq_full = false; | |
484 | } | |
485 | } | |
486 | ||
487 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count, | |
488 | bool nonblock) | |
f997f00b AS |
489 | { |
490 | struct scatterlist sg[1]; | |
491 | struct virtqueue *out_vq; | |
492 | ssize_t ret; | |
cdfadfc1 | 493 | unsigned long flags; |
f997f00b AS |
494 | unsigned int len; |
495 | ||
496 | out_vq = port->out_vq; | |
497 | ||
cdfadfc1 AS |
498 | spin_lock_irqsave(&port->outvq_lock, flags); |
499 | ||
500 | reclaim_consumed_buffers(port); | |
501 | ||
f997f00b | 502 | sg_init_one(sg, in_buf, in_count); |
505b0451 | 503 | ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf); |
f997f00b AS |
504 | |
505 | /* Tell Host to go! */ | |
505b0451 | 506 | virtqueue_kick(out_vq); |
f997f00b AS |
507 | |
508 | if (ret < 0) { | |
9ff4cfab | 509 | in_count = 0; |
cdfadfc1 | 510 | goto done; |
f997f00b AS |
511 | } |
512 | ||
cdfadfc1 AS |
513 | if (ret == 0) |
514 | port->outvq_full = true; | |
515 | ||
516 | if (nonblock) | |
517 | goto done; | |
518 | ||
519 | /* | |
520 | * Wait till the host acknowledges it pushed out the data we | |
531295e6 AS |
521 | * sent. This is done for data from the hvc_console; the tty |
522 | * operations are performed with spinlocks held so we can't | |
523 | * sleep here. An alternative would be to copy the data to a | |
524 | * buffer and relax the spinning requirement. The downside is | |
525 | * we need to kmalloc a GFP_ATOMIC buffer each time the | |
526 | * console driver writes something out. | |
cdfadfc1 | 527 | */ |
505b0451 | 528 | while (!virtqueue_get_buf(out_vq, &len)) |
f997f00b | 529 | cpu_relax(); |
cdfadfc1 AS |
530 | done: |
531 | spin_unlock_irqrestore(&port->outvq_lock, flags); | |
532 | /* | |
533 | * We're expected to return the amount of data we wrote -- all | |
534 | * of it | |
535 | */ | |
9ff4cfab | 536 | return in_count; |
f997f00b AS |
537 | } |
538 | ||
203baab8 AS |
539 | /* |
540 | * Give out the data that's requested from the buffer that we have | |
541 | * queued up. | |
542 | */ | |
b766ceed AS |
543 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
544 | bool to_user) | |
203baab8 AS |
545 | { |
546 | struct port_buffer *buf; | |
547 | unsigned long flags; | |
548 | ||
549 | if (!out_count || !port_has_data(port)) | |
550 | return 0; | |
551 | ||
552 | buf = port->inbuf; | |
b766ceed | 553 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 554 | |
b766ceed AS |
555 | if (to_user) { |
556 | ssize_t ret; | |
557 | ||
558 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
559 | if (ret) | |
560 | return -EFAULT; | |
561 | } else { | |
562 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
563 | } | |
203baab8 | 564 | |
203baab8 AS |
565 | buf->offset += out_count; |
566 | ||
567 | if (buf->offset == buf->len) { | |
568 | /* | |
569 | * We're done using all the data in this buffer. | |
570 | * Re-queue so that the Host can send us more data. | |
571 | */ | |
572 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
573 | port->inbuf = NULL; | |
574 | ||
575 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 576 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
577 | |
578 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
579 | } | |
b766ceed | 580 | /* Return the number of bytes actually copied */ |
203baab8 | 581 | return out_count; |
e27b5198 AS |
582 | } |
583 | ||
2030fa49 | 584 | /* The condition that must be true for polling to end */ |
60caacd3 | 585 | static bool will_read_block(struct port *port) |
2030fa49 | 586 | { |
3709ea7a AS |
587 | if (!port->guest_connected) { |
588 | /* Port got hot-unplugged. Let's exit. */ | |
589 | return false; | |
590 | } | |
60caacd3 | 591 | return !port_has_data(port) && port->host_connected; |
2030fa49 AS |
592 | } |
593 | ||
cdfadfc1 AS |
594 | static bool will_write_block(struct port *port) |
595 | { | |
596 | bool ret; | |
597 | ||
60e5e0b8 AS |
598 | if (!port->guest_connected) { |
599 | /* Port got hot-unplugged. Let's exit. */ | |
600 | return false; | |
601 | } | |
cdfadfc1 AS |
602 | if (!port->host_connected) |
603 | return true; | |
604 | ||
605 | spin_lock_irq(&port->outvq_lock); | |
606 | /* | |
607 | * Check if the Host has consumed any buffers since we last | |
608 | * sent data (this is only applicable for nonblocking ports). | |
609 | */ | |
610 | reclaim_consumed_buffers(port); | |
611 | ret = port->outvq_full; | |
612 | spin_unlock_irq(&port->outvq_lock); | |
613 | ||
614 | return ret; | |
615 | } | |
616 | ||
2030fa49 AS |
617 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, |
618 | size_t count, loff_t *offp) | |
619 | { | |
620 | struct port *port; | |
621 | ssize_t ret; | |
622 | ||
623 | port = filp->private_data; | |
624 | ||
625 | if (!port_has_data(port)) { | |
626 | /* | |
627 | * If nothing's connected on the host just return 0 in | |
628 | * case of list_empty; this tells the userspace app | |
629 | * that there's no connection | |
630 | */ | |
631 | if (!port->host_connected) | |
632 | return 0; | |
633 | if (filp->f_flags & O_NONBLOCK) | |
634 | return -EAGAIN; | |
635 | ||
636 | ret = wait_event_interruptible(port->waitqueue, | |
60caacd3 | 637 | !will_read_block(port)); |
2030fa49 AS |
638 | if (ret < 0) |
639 | return ret; | |
640 | } | |
b3dddb9e AS |
641 | /* Port got hot-unplugged. */ |
642 | if (!port->guest_connected) | |
643 | return -ENODEV; | |
2030fa49 AS |
644 | /* |
645 | * We could've received a disconnection message while we were | |
646 | * waiting for more data. | |
647 | * | |
648 | * This check is not clubbed in the if() statement above as we | |
649 | * might receive some data as well as the host could get | |
650 | * disconnected after we got woken up from our wait. So we | |
651 | * really want to give off whatever data we have and only then | |
652 | * check for host_connected. | |
653 | */ | |
654 | if (!port_has_data(port) && !port->host_connected) | |
655 | return 0; | |
656 | ||
657 | return fill_readbuf(port, ubuf, count, true); | |
658 | } | |
659 | ||
660 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
661 | size_t count, loff_t *offp) | |
662 | { | |
663 | struct port *port; | |
664 | char *buf; | |
665 | ssize_t ret; | |
cdfadfc1 | 666 | bool nonblock; |
2030fa49 | 667 | |
65745422 AS |
668 | /* Userspace could be out to fool us */ |
669 | if (!count) | |
670 | return 0; | |
671 | ||
2030fa49 AS |
672 | port = filp->private_data; |
673 | ||
cdfadfc1 AS |
674 | nonblock = filp->f_flags & O_NONBLOCK; |
675 | ||
676 | if (will_write_block(port)) { | |
677 | if (nonblock) | |
678 | return -EAGAIN; | |
679 | ||
680 | ret = wait_event_interruptible(port->waitqueue, | |
681 | !will_write_block(port)); | |
682 | if (ret < 0) | |
683 | return ret; | |
684 | } | |
f4028119 AS |
685 | /* Port got hot-unplugged. */ |
686 | if (!port->guest_connected) | |
687 | return -ENODEV; | |
cdfadfc1 | 688 | |
2030fa49 AS |
689 | count = min((size_t)(32 * 1024), count); |
690 | ||
691 | buf = kmalloc(count, GFP_KERNEL); | |
692 | if (!buf) | |
693 | return -ENOMEM; | |
694 | ||
695 | ret = copy_from_user(buf, ubuf, count); | |
696 | if (ret) { | |
697 | ret = -EFAULT; | |
698 | goto free_buf; | |
699 | } | |
700 | ||
531295e6 AS |
701 | /* |
702 | * We now ask send_buf() to not spin for generic ports -- we | |
703 | * can re-use the same code path that non-blocking file | |
704 | * descriptors take for blocking file descriptors since the | |
705 | * wait is already done and we're certain the write will go | |
706 | * through to the host. | |
707 | */ | |
708 | nonblock = true; | |
cdfadfc1 AS |
709 | ret = send_buf(port, buf, count, nonblock); |
710 | ||
711 | if (nonblock && ret > 0) | |
712 | goto out; | |
713 | ||
2030fa49 AS |
714 | free_buf: |
715 | kfree(buf); | |
cdfadfc1 | 716 | out: |
2030fa49 AS |
717 | return ret; |
718 | } | |
719 | ||
720 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
721 | { | |
722 | struct port *port; | |
723 | unsigned int ret; | |
724 | ||
725 | port = filp->private_data; | |
726 | poll_wait(filp, &port->waitqueue, wait); | |
727 | ||
8529a504 AS |
728 | if (!port->guest_connected) { |
729 | /* Port got unplugged */ | |
730 | return POLLHUP; | |
731 | } | |
2030fa49 | 732 | ret = 0; |
6df7aadc | 733 | if (!will_read_block(port)) |
2030fa49 | 734 | ret |= POLLIN | POLLRDNORM; |
cdfadfc1 | 735 | if (!will_write_block(port)) |
2030fa49 AS |
736 | ret |= POLLOUT; |
737 | if (!port->host_connected) | |
738 | ret |= POLLHUP; | |
739 | ||
740 | return ret; | |
741 | } | |
742 | ||
b353a6b8 AS |
743 | static void remove_port(struct kref *kref); |
744 | ||
2030fa49 AS |
745 | static int port_fops_release(struct inode *inode, struct file *filp) |
746 | { | |
747 | struct port *port; | |
748 | ||
749 | port = filp->private_data; | |
750 | ||
751 | /* Notify host of port being closed */ | |
752 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
753 | ||
88f251ac | 754 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
755 | port->guest_connected = false; |
756 | ||
88f251ac AS |
757 | discard_port_data(port); |
758 | ||
759 | spin_unlock_irq(&port->inbuf_lock); | |
760 | ||
cdfadfc1 AS |
761 | spin_lock_irq(&port->outvq_lock); |
762 | reclaim_consumed_buffers(port); | |
763 | spin_unlock_irq(&port->outvq_lock); | |
764 | ||
b353a6b8 AS |
765 | /* |
766 | * Locks aren't necessary here as a port can't be opened after | |
767 | * unplug, and if a port isn't unplugged, a kref would already | |
768 | * exist for the port. Plus, taking ports_lock here would | |
769 | * create a dependency on other locks taken by functions | |
770 | * inside remove_port if we're the last holder of the port, | |
771 | * creating many problems. | |
772 | */ | |
773 | kref_put(&port->kref, remove_port); | |
774 | ||
2030fa49 AS |
775 | return 0; |
776 | } | |
777 | ||
778 | static int port_fops_open(struct inode *inode, struct file *filp) | |
779 | { | |
780 | struct cdev *cdev = inode->i_cdev; | |
781 | struct port *port; | |
8ad37e83 | 782 | int ret; |
2030fa49 | 783 | |
04950cdf | 784 | port = find_port_by_devt(cdev->dev); |
2030fa49 AS |
785 | filp->private_data = port; |
786 | ||
b353a6b8 AS |
787 | /* Prevent against a port getting hot-unplugged at the same time */ |
788 | spin_lock_irq(&port->portdev->ports_lock); | |
789 | kref_get(&port->kref); | |
790 | spin_unlock_irq(&port->portdev->ports_lock); | |
791 | ||
2030fa49 AS |
792 | /* |
793 | * Don't allow opening of console port devices -- that's done | |
794 | * via /dev/hvc | |
795 | */ | |
8ad37e83 AS |
796 | if (is_console_port(port)) { |
797 | ret = -ENXIO; | |
798 | goto out; | |
799 | } | |
2030fa49 | 800 | |
3c7969cc AS |
801 | /* Allow only one process to open a particular port at a time */ |
802 | spin_lock_irq(&port->inbuf_lock); | |
803 | if (port->guest_connected) { | |
804 | spin_unlock_irq(&port->inbuf_lock); | |
8ad37e83 AS |
805 | ret = -EMFILE; |
806 | goto out; | |
3c7969cc AS |
807 | } |
808 | ||
809 | port->guest_connected = true; | |
810 | spin_unlock_irq(&port->inbuf_lock); | |
811 | ||
cdfadfc1 AS |
812 | spin_lock_irq(&port->outvq_lock); |
813 | /* | |
814 | * There might be a chance that we missed reclaiming a few | |
815 | * buffers in the window of the port getting previously closed | |
816 | * and opening now. | |
817 | */ | |
818 | reclaim_consumed_buffers(port); | |
819 | spin_unlock_irq(&port->outvq_lock); | |
820 | ||
299fb61c AS |
821 | nonseekable_open(inode, filp); |
822 | ||
2030fa49 AS |
823 | /* Notify host of port being opened */ |
824 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
825 | ||
826 | return 0; | |
8ad37e83 | 827 | out: |
b353a6b8 | 828 | kref_put(&port->kref, remove_port); |
8ad37e83 | 829 | return ret; |
2030fa49 AS |
830 | } |
831 | ||
3eae0ade AS |
832 | static int port_fops_fasync(int fd, struct file *filp, int mode) |
833 | { | |
834 | struct port *port; | |
835 | ||
836 | port = filp->private_data; | |
837 | return fasync_helper(fd, filp, mode, &port->async_queue); | |
838 | } | |
839 | ||
2030fa49 AS |
840 | /* |
841 | * The file operations that we support: programs in the guest can open | |
842 | * a console device, read from it, write to it, poll for data and | |
843 | * close it. The devices are at | |
844 | * /dev/vport<device number>p<port number> | |
845 | */ | |
846 | static const struct file_operations port_fops = { | |
847 | .owner = THIS_MODULE, | |
848 | .open = port_fops_open, | |
849 | .read = port_fops_read, | |
850 | .write = port_fops_write, | |
851 | .poll = port_fops_poll, | |
852 | .release = port_fops_release, | |
3eae0ade | 853 | .fasync = port_fops_fasync, |
299fb61c | 854 | .llseek = no_llseek, |
2030fa49 AS |
855 | }; |
856 | ||
a23ea924 RR |
857 | /* |
858 | * The put_chars() callback is pretty straightforward. | |
31610434 | 859 | * |
a23ea924 RR |
860 | * We turn the characters into a scatter-gather list, add it to the |
861 | * output queue and then kick the Host. Then we sit here waiting for | |
862 | * it to finish: inefficient in theory, but in practice | |
863 | * implementations will do it immediately (lguest's Launcher does). | |
864 | */ | |
31610434 RR |
865 | static int put_chars(u32 vtermno, const char *buf, int count) |
866 | { | |
21206ede | 867 | struct port *port; |
38edf58d | 868 | |
162a689a FD |
869 | if (unlikely(early_put_chars)) |
870 | return early_put_chars(vtermno, buf, count); | |
871 | ||
38edf58d AS |
872 | port = find_port_by_vtermno(vtermno); |
873 | if (!port) | |
6dc69f97 | 874 | return -EPIPE; |
31610434 | 875 | |
cdfadfc1 | 876 | return send_buf(port, (void *)buf, count, false); |
31610434 RR |
877 | } |
878 | ||
a23ea924 RR |
879 | /* |
880 | * get_chars() is the callback from the hvc_console infrastructure | |
881 | * when an interrupt is received. | |
31610434 | 882 | * |
203baab8 AS |
883 | * We call out to fill_readbuf that gets us the required data from the |
884 | * buffers that are queued up. | |
a23ea924 | 885 | */ |
31610434 RR |
886 | static int get_chars(u32 vtermno, char *buf, int count) |
887 | { | |
21206ede RR |
888 | struct port *port; |
889 | ||
6dc69f97 AS |
890 | /* If we've not set up the port yet, we have no input to give. */ |
891 | if (unlikely(early_put_chars)) | |
892 | return 0; | |
893 | ||
38edf58d AS |
894 | port = find_port_by_vtermno(vtermno); |
895 | if (!port) | |
6dc69f97 | 896 | return -EPIPE; |
21206ede | 897 | |
31610434 | 898 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 899 | BUG_ON(!port->in_vq); |
31610434 | 900 | |
b766ceed | 901 | return fill_readbuf(port, buf, count, false); |
31610434 | 902 | } |
31610434 | 903 | |
cb06e367 | 904 | static void resize_console(struct port *port) |
c2983458 | 905 | { |
cb06e367 | 906 | struct virtio_device *vdev; |
c2983458 | 907 | |
2de16a49 | 908 | /* The port could have been hot-unplugged */ |
9778829c | 909 | if (!port || !is_console_port(port)) |
2de16a49 AS |
910 | return; |
911 | ||
cb06e367 | 912 | vdev = port->portdev->vdev; |
9778829c AS |
913 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) |
914 | hvc_resize(port->cons.hvc, port->cons.ws); | |
c2983458 CB |
915 | } |
916 | ||
38edf58d | 917 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
918 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
919 | { | |
38edf58d AS |
920 | struct port *port; |
921 | ||
922 | port = find_port_by_vtermno(hp->vtermno); | |
923 | if (!port) | |
924 | return -EINVAL; | |
925 | ||
91fcad19 | 926 | hp->irq_requested = 1; |
cb06e367 | 927 | resize_console(port); |
c2983458 | 928 | |
91fcad19 CB |
929 | return 0; |
930 | } | |
931 | ||
932 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
933 | { | |
934 | hp->irq_requested = 0; | |
935 | } | |
936 | ||
17634ba2 | 937 | /* The operations for console ports. */ |
1dff3996 | 938 | static const struct hv_ops hv_ops = { |
971f3390 RR |
939 | .get_chars = get_chars, |
940 | .put_chars = put_chars, | |
941 | .notifier_add = notifier_add_vio, | |
942 | .notifier_del = notifier_del_vio, | |
943 | .notifier_hangup = notifier_del_vio, | |
944 | }; | |
945 | ||
946 | /* | |
947 | * Console drivers are initialized very early so boot messages can go | |
948 | * out, so we do things slightly differently from the generic virtio | |
949 | * initialization of the net and block drivers. | |
950 | * | |
951 | * At this stage, the console is output-only. It's too early to set | |
952 | * up a virtqueue, so we let the drivers do some boutique early-output | |
953 | * thing. | |
954 | */ | |
955 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
956 | { | |
957 | early_put_chars = put_chars; | |
958 | return hvc_instantiate(0, 0, &hv_ops); | |
959 | } | |
960 | ||
17634ba2 | 961 | int init_port_console(struct port *port) |
cfa6d379 AS |
962 | { |
963 | int ret; | |
964 | ||
965 | /* | |
966 | * The Host's telling us this port is a console port. Hook it | |
967 | * up with an hvc console. | |
968 | * | |
969 | * To set up and manage our virtual console, we call | |
970 | * hvc_alloc(). | |
971 | * | |
972 | * The first argument of hvc_alloc() is the virtual console | |
973 | * number. The second argument is the parameter for the | |
974 | * notification mechanism (like irq number). We currently | |
975 | * leave this as zero, virtqueues have implicit notifications. | |
976 | * | |
977 | * The third argument is a "struct hv_ops" containing the | |
978 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
979 | * pointers. The final argument is the output buffer size: we | |
980 | * can do any size, so we put PAGE_SIZE here. | |
981 | */ | |
982 | port->cons.vtermno = pdrvdata.next_vtermno; | |
983 | ||
984 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
985 | if (IS_ERR(port->cons.hvc)) { | |
986 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
987 | dev_err(port->dev, |
988 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
989 | port->cons.hvc = NULL; |
990 | return ret; | |
991 | } | |
992 | spin_lock_irq(&pdrvdata_lock); | |
993 | pdrvdata.next_vtermno++; | |
994 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
995 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 996 | port->guest_connected = true; |
cfa6d379 | 997 | |
1d05160b AS |
998 | /* |
999 | * Start using the new console output if this is the first | |
1000 | * console to come up. | |
1001 | */ | |
1002 | if (early_put_chars) | |
1003 | early_put_chars = NULL; | |
1004 | ||
2030fa49 AS |
1005 | /* Notify host of port being opened */ |
1006 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1007 | ||
cfa6d379 AS |
1008 | return 0; |
1009 | } | |
1010 | ||
431edb8a AS |
1011 | static ssize_t show_port_name(struct device *dev, |
1012 | struct device_attribute *attr, char *buffer) | |
1013 | { | |
1014 | struct port *port; | |
1015 | ||
1016 | port = dev_get_drvdata(dev); | |
1017 | ||
1018 | return sprintf(buffer, "%s\n", port->name); | |
1019 | } | |
1020 | ||
1021 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
1022 | ||
1023 | static struct attribute *port_sysfs_entries[] = { | |
1024 | &dev_attr_name.attr, | |
1025 | NULL | |
1026 | }; | |
1027 | ||
1028 | static struct attribute_group port_attribute_group = { | |
1029 | .name = NULL, /* put in device directory */ | |
1030 | .attrs = port_sysfs_entries, | |
1031 | }; | |
1032 | ||
d99393ef AS |
1033 | static int debugfs_open(struct inode *inode, struct file *filp) |
1034 | { | |
1035 | filp->private_data = inode->i_private; | |
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, | |
1040 | size_t count, loff_t *offp) | |
1041 | { | |
1042 | struct port *port; | |
1043 | char *buf; | |
1044 | ssize_t ret, out_offset, out_count; | |
1045 | ||
1046 | out_count = 1024; | |
1047 | buf = kmalloc(out_count, GFP_KERNEL); | |
1048 | if (!buf) | |
1049 | return -ENOMEM; | |
1050 | ||
1051 | port = filp->private_data; | |
1052 | out_offset = 0; | |
1053 | out_offset += snprintf(buf + out_offset, out_count, | |
1054 | "name: %s\n", port->name ? port->name : ""); | |
1055 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1056 | "guest_connected: %d\n", port->guest_connected); | |
1057 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1058 | "host_connected: %d\n", port->host_connected); | |
cdfadfc1 AS |
1059 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1060 | "outvq_full: %d\n", port->outvq_full); | |
d99393ef AS |
1061 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1062 | "is_console: %s\n", | |
1063 | is_console_port(port) ? "yes" : "no"); | |
1064 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1065 | "console_vtermno: %u\n", port->cons.vtermno); | |
1066 | ||
1067 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
1068 | kfree(buf); | |
1069 | return ret; | |
1070 | } | |
1071 | ||
1072 | static const struct file_operations port_debugfs_ops = { | |
1073 | .owner = THIS_MODULE, | |
1074 | .open = debugfs_open, | |
1075 | .read = debugfs_read, | |
1076 | }; | |
1077 | ||
9778829c AS |
1078 | static void set_console_size(struct port *port, u16 rows, u16 cols) |
1079 | { | |
1080 | if (!port || !is_console_port(port)) | |
1081 | return; | |
1082 | ||
1083 | port->cons.ws.ws_row = rows; | |
1084 | port->cons.ws.ws_col = cols; | |
1085 | } | |
1086 | ||
c446f8fc AS |
1087 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
1088 | { | |
1089 | struct port_buffer *buf; | |
1090 | unsigned int nr_added_bufs; | |
1091 | int ret; | |
1092 | ||
1093 | nr_added_bufs = 0; | |
1094 | do { | |
1095 | buf = alloc_buf(PAGE_SIZE); | |
1096 | if (!buf) | |
1097 | break; | |
1098 | ||
1099 | spin_lock_irq(lock); | |
1100 | ret = add_inbuf(vq, buf); | |
1101 | if (ret < 0) { | |
1102 | spin_unlock_irq(lock); | |
1103 | free_buf(buf); | |
1104 | break; | |
1105 | } | |
1106 | nr_added_bufs++; | |
1107 | spin_unlock_irq(lock); | |
1108 | } while (ret > 0); | |
1109 | ||
1110 | return nr_added_bufs; | |
1111 | } | |
1112 | ||
3eae0ade AS |
1113 | static void send_sigio_to_port(struct port *port) |
1114 | { | |
1115 | if (port->async_queue && port->guest_connected) | |
1116 | kill_fasync(&port->async_queue, SIGIO, POLL_OUT); | |
1117 | } | |
1118 | ||
c446f8fc AS |
1119 | static int add_port(struct ports_device *portdev, u32 id) |
1120 | { | |
1121 | char debugfs_name[16]; | |
1122 | struct port *port; | |
1123 | struct port_buffer *buf; | |
1124 | dev_t devt; | |
1125 | unsigned int nr_added_bufs; | |
1126 | int err; | |
1127 | ||
1128 | port = kmalloc(sizeof(*port), GFP_KERNEL); | |
1129 | if (!port) { | |
1130 | err = -ENOMEM; | |
1131 | goto fail; | |
1132 | } | |
b353a6b8 | 1133 | kref_init(&port->kref); |
c446f8fc AS |
1134 | |
1135 | port->portdev = portdev; | |
1136 | port->id = id; | |
1137 | ||
1138 | port->name = NULL; | |
1139 | port->inbuf = NULL; | |
1140 | port->cons.hvc = NULL; | |
3eae0ade | 1141 | port->async_queue = NULL; |
c446f8fc | 1142 | |
9778829c AS |
1143 | port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
1144 | ||
c446f8fc AS |
1145 | port->host_connected = port->guest_connected = false; |
1146 | ||
cdfadfc1 AS |
1147 | port->outvq_full = false; |
1148 | ||
c446f8fc AS |
1149 | port->in_vq = portdev->in_vqs[port->id]; |
1150 | port->out_vq = portdev->out_vqs[port->id]; | |
1151 | ||
d22a6989 AS |
1152 | port->cdev = cdev_alloc(); |
1153 | if (!port->cdev) { | |
1154 | dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); | |
1155 | err = -ENOMEM; | |
1156 | goto free_port; | |
1157 | } | |
1158 | port->cdev->ops = &port_fops; | |
c446f8fc AS |
1159 | |
1160 | devt = MKDEV(portdev->chr_major, id); | |
d22a6989 | 1161 | err = cdev_add(port->cdev, devt, 1); |
c446f8fc AS |
1162 | if (err < 0) { |
1163 | dev_err(&port->portdev->vdev->dev, | |
1164 | "Error %d adding cdev for port %u\n", err, id); | |
d22a6989 | 1165 | goto free_cdev; |
c446f8fc AS |
1166 | } |
1167 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1168 | devt, port, "vport%up%u", | |
1169 | port->portdev->drv_index, id); | |
1170 | if (IS_ERR(port->dev)) { | |
1171 | err = PTR_ERR(port->dev); | |
1172 | dev_err(&port->portdev->vdev->dev, | |
1173 | "Error %d creating device for port %u\n", | |
1174 | err, id); | |
1175 | goto free_cdev; | |
1176 | } | |
1177 | ||
1178 | spin_lock_init(&port->inbuf_lock); | |
cdfadfc1 | 1179 | spin_lock_init(&port->outvq_lock); |
c446f8fc AS |
1180 | init_waitqueue_head(&port->waitqueue); |
1181 | ||
1182 | /* Fill the in_vq with buffers so the host can send us data. */ | |
1183 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); | |
1184 | if (!nr_added_bufs) { | |
1185 | dev_err(port->dev, "Error allocating inbufs\n"); | |
1186 | err = -ENOMEM; | |
1187 | goto free_device; | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * If we're not using multiport support, this has to be a console port | |
1192 | */ | |
1193 | if (!use_multiport(port->portdev)) { | |
1194 | err = init_port_console(port); | |
1195 | if (err) | |
1196 | goto free_inbufs; | |
1197 | } | |
1198 | ||
1199 | spin_lock_irq(&portdev->ports_lock); | |
1200 | list_add_tail(&port->list, &port->portdev->ports); | |
1201 | spin_unlock_irq(&portdev->ports_lock); | |
1202 | ||
1203 | /* | |
1204 | * Tell the Host we're set so that it can send us various | |
1205 | * configuration parameters for this port (eg, port name, | |
1206 | * caching, whether this is a console port, etc.) | |
1207 | */ | |
1208 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
1209 | ||
1210 | if (pdrvdata.debugfs_dir) { | |
1211 | /* | |
1212 | * Finally, create the debugfs file that we can use to | |
1213 | * inspect a port's state at any time | |
1214 | */ | |
1215 | sprintf(debugfs_name, "vport%up%u", | |
1216 | port->portdev->drv_index, id); | |
1217 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, | |
1218 | pdrvdata.debugfs_dir, | |
1219 | port, | |
1220 | &port_debugfs_ops); | |
1221 | } | |
1222 | return 0; | |
1223 | ||
1224 | free_inbufs: | |
1225 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1226 | free_buf(buf); | |
1227 | free_device: | |
1228 | device_destroy(pdrvdata.class, port->dev->devt); | |
1229 | free_cdev: | |
d22a6989 | 1230 | cdev_del(port->cdev); |
c446f8fc AS |
1231 | free_port: |
1232 | kfree(port); | |
1233 | fail: | |
1234 | /* The host might want to notify management sw about port add failure */ | |
0643e4c6 | 1235 | __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
c446f8fc AS |
1236 | return err; |
1237 | } | |
1238 | ||
b353a6b8 AS |
1239 | /* No users remain, remove all port-specific data. */ |
1240 | static void remove_port(struct kref *kref) | |
1241 | { | |
1242 | struct port *port; | |
1243 | ||
1244 | port = container_of(kref, struct port, kref); | |
1245 | ||
1246 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); | |
1247 | device_destroy(pdrvdata.class, port->dev->devt); | |
1248 | cdev_del(port->cdev); | |
1249 | ||
1250 | kfree(port->name); | |
1251 | ||
1252 | debugfs_remove(port->debugfs_file); | |
1253 | ||
1254 | kfree(port); | |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * Port got unplugged. Remove port from portdev's list and drop the | |
1259 | * kref reference. If no userspace has this port opened, it will | |
1260 | * result in immediate removal the port. | |
1261 | */ | |
1262 | static void unplug_port(struct port *port) | |
1f7aa42d | 1263 | { |
a9cdd485 AS |
1264 | struct port_buffer *buf; |
1265 | ||
b353a6b8 AS |
1266 | spin_lock_irq(&port->portdev->ports_lock); |
1267 | list_del(&port->list); | |
1268 | spin_unlock_irq(&port->portdev->ports_lock); | |
1269 | ||
0047634d AS |
1270 | if (port->guest_connected) { |
1271 | port->guest_connected = false; | |
1272 | port->host_connected = false; | |
1273 | wake_up_interruptible(&port->waitqueue); | |
a461e11e AS |
1274 | |
1275 | /* Let the app know the port is going down. */ | |
1276 | send_sigio_to_port(port); | |
0047634d AS |
1277 | } |
1278 | ||
1f7aa42d AS |
1279 | if (is_console_port(port)) { |
1280 | spin_lock_irq(&pdrvdata_lock); | |
1281 | list_del(&port->cons.list); | |
1282 | spin_unlock_irq(&pdrvdata_lock); | |
69eb9a9f AS |
1283 | #if 0 |
1284 | /* | |
1285 | * hvc_remove() not called as removing one hvc port | |
1286 | * results in other hvc ports getting frozen. | |
1287 | * | |
1288 | * Once this is resolved in hvc, this functionality | |
1289 | * will be enabled. Till that is done, the -EPIPE | |
1290 | * return from get_chars() above will help | |
1291 | * hvc_console.c to clean up on ports we remove here. | |
1292 | */ | |
1f7aa42d | 1293 | hvc_remove(port->cons.hvc); |
69eb9a9f | 1294 | #endif |
1f7aa42d | 1295 | } |
1f7aa42d | 1296 | |
a9cdd485 | 1297 | /* Remove unused data this port might have received. */ |
1f7aa42d | 1298 | discard_port_data(port); |
a9cdd485 | 1299 | |
cdfadfc1 AS |
1300 | reclaim_consumed_buffers(port); |
1301 | ||
a9cdd485 | 1302 | /* Remove buffers we queued up for the Host to send us data in. */ |
505b0451 | 1303 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) |
a9cdd485 AS |
1304 | free_buf(buf); |
1305 | ||
b353a6b8 AS |
1306 | /* |
1307 | * We should just assume the device itself has gone off -- | |
1308 | * else a close on an open port later will try to send out a | |
1309 | * control message. | |
1310 | */ | |
1311 | port->portdev = NULL; | |
d99393ef | 1312 | |
b353a6b8 AS |
1313 | /* |
1314 | * Locks around here are not necessary - a port can't be | |
1315 | * opened after we removed the port struct from ports_list | |
1316 | * above. | |
1317 | */ | |
1318 | kref_put(&port->kref, remove_port); | |
1f7aa42d AS |
1319 | } |
1320 | ||
17634ba2 AS |
1321 | /* Any private messages that the Host and Guest want to share */ |
1322 | static void handle_control_message(struct ports_device *portdev, | |
1323 | struct port_buffer *buf) | |
1324 | { | |
1325 | struct virtio_console_control *cpkt; | |
1326 | struct port *port; | |
431edb8a AS |
1327 | size_t name_size; |
1328 | int err; | |
17634ba2 AS |
1329 | |
1330 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
1331 | ||
1332 | port = find_port_by_id(portdev, cpkt->id); | |
f909f850 | 1333 | if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) { |
17634ba2 AS |
1334 | /* No valid header at start of buffer. Drop it. */ |
1335 | dev_dbg(&portdev->vdev->dev, | |
1336 | "Invalid index %u in control packet\n", cpkt->id); | |
1337 | return; | |
1338 | } | |
1339 | ||
1340 | switch (cpkt->event) { | |
f909f850 AS |
1341 | case VIRTIO_CONSOLE_PORT_ADD: |
1342 | if (port) { | |
1d05160b AS |
1343 | dev_dbg(&portdev->vdev->dev, |
1344 | "Port %u already added\n", port->id); | |
f909f850 AS |
1345 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
1346 | break; | |
1347 | } | |
1348 | if (cpkt->id >= portdev->config.max_nr_ports) { | |
1349 | dev_warn(&portdev->vdev->dev, | |
1350 | "Request for adding port with out-of-bound id %u, max. supported id: %u\n", | |
1351 | cpkt->id, portdev->config.max_nr_ports - 1); | |
1352 | break; | |
1353 | } | |
1354 | add_port(portdev, cpkt->id); | |
1355 | break; | |
1356 | case VIRTIO_CONSOLE_PORT_REMOVE: | |
b353a6b8 | 1357 | unplug_port(port); |
f909f850 | 1358 | break; |
17634ba2 AS |
1359 | case VIRTIO_CONSOLE_CONSOLE_PORT: |
1360 | if (!cpkt->value) | |
1361 | break; | |
1362 | if (is_console_port(port)) | |
1363 | break; | |
1364 | ||
1365 | init_port_console(port); | |
1366 | /* | |
1367 | * Could remove the port here in case init fails - but | |
1368 | * have to notify the host first. | |
1369 | */ | |
1370 | break; | |
8345adbf AS |
1371 | case VIRTIO_CONSOLE_RESIZE: { |
1372 | struct { | |
1373 | __u16 rows; | |
1374 | __u16 cols; | |
1375 | } size; | |
1376 | ||
17634ba2 AS |
1377 | if (!is_console_port(port)) |
1378 | break; | |
8345adbf AS |
1379 | |
1380 | memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), | |
1381 | sizeof(size)); | |
1382 | set_console_size(port, size.rows, size.cols); | |
1383 | ||
17634ba2 AS |
1384 | port->cons.hvc->irq_requested = 1; |
1385 | resize_console(port); | |
1386 | break; | |
8345adbf | 1387 | } |
2030fa49 AS |
1388 | case VIRTIO_CONSOLE_PORT_OPEN: |
1389 | port->host_connected = cpkt->value; | |
1390 | wake_up_interruptible(&port->waitqueue); | |
cdfadfc1 AS |
1391 | /* |
1392 | * If the host port got closed and the host had any | |
1393 | * unconsumed buffers, we'll be able to reclaim them | |
1394 | * now. | |
1395 | */ | |
1396 | spin_lock_irq(&port->outvq_lock); | |
1397 | reclaim_consumed_buffers(port); | |
1398 | spin_unlock_irq(&port->outvq_lock); | |
3eae0ade AS |
1399 | |
1400 | /* | |
1401 | * If the guest is connected, it'll be interested in | |
1402 | * knowing the host connection state changed. | |
1403 | */ | |
1404 | send_sigio_to_port(port); | |
2030fa49 | 1405 | break; |
431edb8a AS |
1406 | case VIRTIO_CONSOLE_PORT_NAME: |
1407 | /* | |
1408 | * Skip the size of the header and the cpkt to get the size | |
1409 | * of the name that was sent | |
1410 | */ | |
1411 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
1412 | ||
1413 | port->name = kmalloc(name_size, GFP_KERNEL); | |
1414 | if (!port->name) { | |
1415 | dev_err(port->dev, | |
1416 | "Not enough space to store port name\n"); | |
1417 | break; | |
1418 | } | |
1419 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
1420 | name_size - 1); | |
1421 | port->name[name_size - 1] = 0; | |
1422 | ||
1423 | /* | |
1424 | * Since we only have one sysfs attribute, 'name', | |
1425 | * create it only if we have a name for the port. | |
1426 | */ | |
1427 | err = sysfs_create_group(&port->dev->kobj, | |
1428 | &port_attribute_group); | |
ec64213c | 1429 | if (err) { |
431edb8a AS |
1430 | dev_err(port->dev, |
1431 | "Error %d creating sysfs device attributes\n", | |
1432 | err); | |
ec64213c AS |
1433 | } else { |
1434 | /* | |
1435 | * Generate a udev event so that appropriate | |
1436 | * symlinks can be created based on udev | |
1437 | * rules. | |
1438 | */ | |
1439 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
1440 | } | |
431edb8a | 1441 | break; |
17634ba2 AS |
1442 | } |
1443 | } | |
1444 | ||
1445 | static void control_work_handler(struct work_struct *work) | |
1446 | { | |
1447 | struct ports_device *portdev; | |
1448 | struct virtqueue *vq; | |
1449 | struct port_buffer *buf; | |
1450 | unsigned int len; | |
1451 | ||
1452 | portdev = container_of(work, struct ports_device, control_work); | |
1453 | vq = portdev->c_ivq; | |
1454 | ||
1455 | spin_lock(&portdev->cvq_lock); | |
505b0451 | 1456 | while ((buf = virtqueue_get_buf(vq, &len))) { |
17634ba2 AS |
1457 | spin_unlock(&portdev->cvq_lock); |
1458 | ||
1459 | buf->len = len; | |
1460 | buf->offset = 0; | |
1461 | ||
1462 | handle_control_message(portdev, buf); | |
1463 | ||
1464 | spin_lock(&portdev->cvq_lock); | |
1465 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
1466 | dev_warn(&portdev->vdev->dev, | |
1467 | "Error adding buffer to queue\n"); | |
1468 | free_buf(buf); | |
1469 | } | |
1470 | } | |
1471 | spin_unlock(&portdev->cvq_lock); | |
1472 | } | |
1473 | ||
2770c5ea AS |
1474 | static void out_intr(struct virtqueue *vq) |
1475 | { | |
1476 | struct port *port; | |
1477 | ||
1478 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1479 | if (!port) | |
1480 | return; | |
1481 | ||
1482 | wake_up_interruptible(&port->waitqueue); | |
1483 | } | |
1484 | ||
17634ba2 AS |
1485 | static void in_intr(struct virtqueue *vq) |
1486 | { | |
1487 | struct port *port; | |
1488 | unsigned long flags; | |
1489 | ||
1490 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1491 | if (!port) | |
1492 | return; | |
1493 | ||
1494 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d6933561 AS |
1495 | if (!port->inbuf) |
1496 | port->inbuf = get_inbuf(port); | |
17634ba2 | 1497 | |
88f251ac AS |
1498 | /* |
1499 | * Don't queue up data when port is closed. This condition | |
1500 | * can be reached when a console port is not yet connected (no | |
1501 | * tty is spawned) and the host sends out data to console | |
1502 | * ports. For generic serial ports, the host won't | |
1503 | * (shouldn't) send data till the guest is connected. | |
1504 | */ | |
1505 | if (!port->guest_connected) | |
1506 | discard_port_data(port); | |
1507 | ||
17634ba2 AS |
1508 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1509 | ||
2030fa49 AS |
1510 | wake_up_interruptible(&port->waitqueue); |
1511 | ||
55f6bcce AS |
1512 | /* Send a SIGIO indicating new data in case the process asked for it */ |
1513 | send_sigio_to_port(port); | |
1514 | ||
17634ba2 AS |
1515 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1516 | hvc_kick(); | |
1517 | } | |
1518 | ||
1519 | static void control_intr(struct virtqueue *vq) | |
1520 | { | |
1521 | struct ports_device *portdev; | |
1522 | ||
1523 | portdev = vq->vdev->priv; | |
1524 | schedule_work(&portdev->control_work); | |
1525 | } | |
1526 | ||
7f5d810d AS |
1527 | static void config_intr(struct virtio_device *vdev) |
1528 | { | |
1529 | struct ports_device *portdev; | |
1530 | ||
1531 | portdev = vdev->priv; | |
99f905f8 | 1532 | |
4038f5b7 | 1533 | if (!use_multiport(portdev)) { |
9778829c AS |
1534 | struct port *port; |
1535 | u16 rows, cols; | |
1536 | ||
1537 | vdev->config->get(vdev, | |
1538 | offsetof(struct virtio_console_config, cols), | |
1539 | &cols, sizeof(u16)); | |
1540 | vdev->config->get(vdev, | |
1541 | offsetof(struct virtio_console_config, rows), | |
1542 | &rows, sizeof(u16)); | |
1543 | ||
1544 | port = find_port_by_id(portdev, 0); | |
1545 | set_console_size(port, rows, cols); | |
1546 | ||
4038f5b7 AS |
1547 | /* |
1548 | * We'll use this way of resizing only for legacy | |
1549 | * support. For newer userspace | |
1550 | * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages | |
1551 | * to indicate console size changes so that it can be | |
1552 | * done per-port. | |
1553 | */ | |
9778829c | 1554 | resize_console(port); |
4038f5b7 | 1555 | } |
7f5d810d AS |
1556 | } |
1557 | ||
2658a79a AS |
1558 | static int init_vqs(struct ports_device *portdev) |
1559 | { | |
1560 | vq_callback_t **io_callbacks; | |
1561 | char **io_names; | |
1562 | struct virtqueue **vqs; | |
17634ba2 | 1563 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1564 | int err; |
1565 | ||
17634ba2 AS |
1566 | nr_ports = portdev->config.max_nr_ports; |
1567 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1568 | |
1569 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
2658a79a | 1570 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); |
2658a79a | 1571 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); |
2658a79a AS |
1572 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1573 | GFP_KERNEL); | |
2658a79a AS |
1574 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1575 | GFP_KERNEL); | |
22e132ff JS |
1576 | if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || |
1577 | !portdev->out_vqs) { | |
2658a79a | 1578 | err = -ENOMEM; |
22e132ff | 1579 | goto free; |
2658a79a AS |
1580 | } |
1581 | ||
17634ba2 AS |
1582 | /* |
1583 | * For backward compat (newer host but older guest), the host | |
1584 | * spawns a console port first and also inits the vqs for port | |
1585 | * 0 before others. | |
1586 | */ | |
1587 | j = 0; | |
1588 | io_callbacks[j] = in_intr; | |
2770c5ea | 1589 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1590 | io_names[j] = "input"; |
1591 | io_names[j + 1] = "output"; | |
1592 | j += 2; | |
1593 | ||
1594 | if (use_multiport(portdev)) { | |
1595 | io_callbacks[j] = control_intr; | |
1596 | io_callbacks[j + 1] = NULL; | |
1597 | io_names[j] = "control-i"; | |
1598 | io_names[j + 1] = "control-o"; | |
1599 | ||
1600 | for (i = 1; i < nr_ports; i++) { | |
1601 | j += 2; | |
1602 | io_callbacks[j] = in_intr; | |
2770c5ea | 1603 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1604 | io_names[j] = "input"; |
1605 | io_names[j + 1] = "output"; | |
1606 | } | |
1607 | } | |
2658a79a AS |
1608 | /* Find the queues. */ |
1609 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1610 | io_callbacks, | |
1611 | (const char **)io_names); | |
1612 | if (err) | |
22e132ff | 1613 | goto free; |
2658a79a | 1614 | |
17634ba2 | 1615 | j = 0; |
2658a79a AS |
1616 | portdev->in_vqs[0] = vqs[0]; |
1617 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1618 | j += 2; |
1619 | if (use_multiport(portdev)) { | |
1620 | portdev->c_ivq = vqs[j]; | |
1621 | portdev->c_ovq = vqs[j + 1]; | |
1622 | ||
1623 | for (i = 1; i < nr_ports; i++) { | |
1624 | j += 2; | |
1625 | portdev->in_vqs[i] = vqs[j]; | |
1626 | portdev->out_vqs[i] = vqs[j + 1]; | |
1627 | } | |
1628 | } | |
2658a79a | 1629 | kfree(io_names); |
22e132ff | 1630 | kfree(io_callbacks); |
2658a79a AS |
1631 | kfree(vqs); |
1632 | ||
1633 | return 0; | |
1634 | ||
22e132ff | 1635 | free: |
2658a79a | 1636 | kfree(portdev->out_vqs); |
2658a79a | 1637 | kfree(portdev->in_vqs); |
22e132ff JS |
1638 | kfree(io_names); |
1639 | kfree(io_callbacks); | |
2658a79a | 1640 | kfree(vqs); |
22e132ff | 1641 | |
2658a79a AS |
1642 | return err; |
1643 | } | |
1644 | ||
fb08bd27 AS |
1645 | static const struct file_operations portdev_fops = { |
1646 | .owner = THIS_MODULE, | |
1647 | }; | |
1648 | ||
1c85bf35 AS |
1649 | /* |
1650 | * Once we're further in boot, we get probed like any other virtio | |
1651 | * device. | |
17634ba2 AS |
1652 | * |
1653 | * If the host also supports multiple console ports, we check the | |
1654 | * config space to see how many ports the host has spawned. We | |
1655 | * initialize each port found. | |
1c85bf35 AS |
1656 | */ |
1657 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1658 | { | |
1c85bf35 AS |
1659 | struct ports_device *portdev; |
1660 | int err; | |
17634ba2 | 1661 | bool multiport; |
1c85bf35 AS |
1662 | |
1663 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1664 | if (!portdev) { | |
1665 | err = -ENOMEM; | |
1666 | goto fail; | |
1667 | } | |
1668 | ||
1669 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1670 | portdev->vdev = vdev; | |
1671 | vdev->priv = portdev; | |
1672 | ||
fb08bd27 AS |
1673 | spin_lock_irq(&pdrvdata_lock); |
1674 | portdev->drv_index = pdrvdata.index++; | |
1675 | spin_unlock_irq(&pdrvdata_lock); | |
1676 | ||
1677 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1678 | &portdev_fops); | |
1679 | if (portdev->chr_major < 0) { | |
1680 | dev_err(&vdev->dev, | |
1681 | "Error %d registering chrdev for device %u\n", | |
1682 | portdev->chr_major, portdev->drv_index); | |
1683 | err = portdev->chr_major; | |
1684 | goto free; | |
1685 | } | |
1686 | ||
17634ba2 | 1687 | multiport = false; |
17634ba2 AS |
1688 | portdev->config.max_nr_ports = 1; |
1689 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { | |
1690 | multiport = true; | |
1691 | vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; | |
1692 | ||
b99fa815 AS |
1693 | vdev->config->get(vdev, offsetof(struct virtio_console_config, |
1694 | max_nr_ports), | |
17634ba2 AS |
1695 | &portdev->config.max_nr_ports, |
1696 | sizeof(portdev->config.max_nr_ports)); | |
17634ba2 AS |
1697 | } |
1698 | ||
1699 | /* Let the Host know we support multiple ports.*/ | |
1700 | vdev->config->finalize_features(vdev); | |
1701 | ||
2658a79a AS |
1702 | err = init_vqs(portdev); |
1703 | if (err < 0) { | |
1704 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1705 | goto free_chrdev; |
2658a79a | 1706 | } |
1c85bf35 | 1707 | |
17634ba2 AS |
1708 | spin_lock_init(&portdev->ports_lock); |
1709 | INIT_LIST_HEAD(&portdev->ports); | |
1710 | ||
1711 | if (multiport) { | |
335a64a5 AS |
1712 | unsigned int nr_added_bufs; |
1713 | ||
17634ba2 AS |
1714 | spin_lock_init(&portdev->cvq_lock); |
1715 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
1716 | ||
335a64a5 AS |
1717 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
1718 | if (!nr_added_bufs) { | |
22a29eac AS |
1719 | dev_err(&vdev->dev, |
1720 | "Error allocating buffers for control queue\n"); | |
1721 | err = -ENOMEM; | |
1722 | goto free_vqs; | |
1723 | } | |
1d05160b AS |
1724 | } else { |
1725 | /* | |
1726 | * For backward compatibility: Create a console port | |
1727 | * if we're running on older host. | |
1728 | */ | |
1729 | add_port(portdev, 0); | |
17634ba2 AS |
1730 | } |
1731 | ||
6bdf2afd AS |
1732 | spin_lock_irq(&pdrvdata_lock); |
1733 | list_add_tail(&portdev->list, &pdrvdata.portdevs); | |
1734 | spin_unlock_irq(&pdrvdata_lock); | |
1735 | ||
f909f850 AS |
1736 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
1737 | VIRTIO_CONSOLE_DEVICE_READY, 1); | |
31610434 RR |
1738 | return 0; |
1739 | ||
22a29eac | 1740 | free_vqs: |
0643e4c6 JL |
1741 | /* The host might want to notify mgmt sw about device add failure */ |
1742 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, | |
1743 | VIRTIO_CONSOLE_DEVICE_READY, 0); | |
22a29eac AS |
1744 | vdev->config->del_vqs(vdev); |
1745 | kfree(portdev->in_vqs); | |
1746 | kfree(portdev->out_vqs); | |
fb08bd27 AS |
1747 | free_chrdev: |
1748 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1749 | free: |
1c85bf35 | 1750 | kfree(portdev); |
31610434 RR |
1751 | fail: |
1752 | return err; | |
1753 | } | |
1754 | ||
7177876f AS |
1755 | static void virtcons_remove(struct virtio_device *vdev) |
1756 | { | |
1757 | struct ports_device *portdev; | |
1758 | struct port *port, *port2; | |
7177876f AS |
1759 | |
1760 | portdev = vdev->priv; | |
1761 | ||
6bdf2afd AS |
1762 | spin_lock_irq(&pdrvdata_lock); |
1763 | list_del(&portdev->list); | |
1764 | spin_unlock_irq(&pdrvdata_lock); | |
1765 | ||
02238959 AS |
1766 | /* Disable interrupts for vqs */ |
1767 | vdev->config->reset(vdev); | |
1768 | /* Finish up work that's lined up */ | |
7177876f | 1769 | cancel_work_sync(&portdev->control_work); |
7177876f AS |
1770 | |
1771 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
b353a6b8 | 1772 | unplug_port(port); |
7177876f AS |
1773 | |
1774 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
1775 | ||
e062013c AS |
1776 | /* |
1777 | * When yanking out a device, we immediately lose the | |
1778 | * (device-side) queues. So there's no point in keeping the | |
1779 | * guest side around till we drop our final reference. This | |
1780 | * also means that any ports which are in an open state will | |
1781 | * have to just stop using the port, as the vqs are going | |
1782 | * away. | |
1783 | */ | |
96eb872b AS |
1784 | if (use_multiport(portdev)) { |
1785 | struct port_buffer *buf; | |
1786 | unsigned int len; | |
7177876f | 1787 | |
96eb872b AS |
1788 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) |
1789 | free_buf(buf); | |
1790 | ||
1791 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) | |
1792 | free_buf(buf); | |
1793 | } | |
7177876f AS |
1794 | |
1795 | vdev->config->del_vqs(vdev); | |
1796 | kfree(portdev->in_vqs); | |
1797 | kfree(portdev->out_vqs); | |
1798 | ||
1799 | kfree(portdev); | |
1800 | } | |
1801 | ||
31610434 RR |
1802 | static struct virtio_device_id id_table[] = { |
1803 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1804 | { 0 }, | |
1805 | }; | |
1806 | ||
c2983458 CB |
1807 | static unsigned int features[] = { |
1808 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 1809 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1810 | }; |
1811 | ||
31610434 | 1812 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1813 | .feature_table = features, |
1814 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1815 | .driver.name = KBUILD_MODNAME, |
1816 | .driver.owner = THIS_MODULE, | |
1817 | .id_table = id_table, | |
1818 | .probe = virtcons_probe, | |
7177876f | 1819 | .remove = virtcons_remove, |
7f5d810d | 1820 | .config_changed = config_intr, |
31610434 RR |
1821 | }; |
1822 | ||
1823 | static int __init init(void) | |
1824 | { | |
fb08bd27 AS |
1825 | int err; |
1826 | ||
1827 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
1828 | if (IS_ERR(pdrvdata.class)) { | |
1829 | err = PTR_ERR(pdrvdata.class); | |
1830 | pr_err("Error %d creating virtio-ports class\n", err); | |
1831 | return err; | |
1832 | } | |
d99393ef AS |
1833 | |
1834 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
1835 | if (!pdrvdata.debugfs_dir) { | |
1836 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
1837 | PTR_ERR(pdrvdata.debugfs_dir)); | |
1838 | } | |
38edf58d | 1839 | INIT_LIST_HEAD(&pdrvdata.consoles); |
6bdf2afd | 1840 | INIT_LIST_HEAD(&pdrvdata.portdevs); |
38edf58d | 1841 | |
31610434 RR |
1842 | return register_virtio_driver(&virtio_console); |
1843 | } | |
7177876f AS |
1844 | |
1845 | static void __exit fini(void) | |
1846 | { | |
1847 | unregister_virtio_driver(&virtio_console); | |
1848 | ||
1849 | class_destroy(pdrvdata.class); | |
1850 | if (pdrvdata.debugfs_dir) | |
1851 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
1852 | } | |
31610434 | 1853 | module_init(init); |
7177876f | 1854 | module_exit(fini); |
31610434 RR |
1855 | |
1856 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1857 | MODULE_DESCRIPTION("Virtio console driver"); | |
1858 | MODULE_LICENSE("GPL"); |