Commit | Line | Data |
---|---|---|
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> |
5e38483b | 22 | #include <linux/completion.h> |
fb08bd27 | 23 | #include <linux/device.h> |
31610434 | 24 | #include <linux/err.h> |
a08fa92d | 25 | #include <linux/freezer.h> |
2030fa49 | 26 | #include <linux/fs.h> |
31610434 | 27 | #include <linux/init.h> |
38edf58d | 28 | #include <linux/list.h> |
2030fa49 AS |
29 | #include <linux/poll.h> |
30 | #include <linux/sched.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
38edf58d | 32 | #include <linux/spinlock.h> |
31610434 RR |
33 | #include <linux/virtio.h> |
34 | #include <linux/virtio_console.h> | |
2030fa49 | 35 | #include <linux/wait.h> |
17634ba2 | 36 | #include <linux/workqueue.h> |
c22405c9 | 37 | #include <linux/module.h> |
51df0acc | 38 | #include "../tty/hvc/hvc_console.h" |
31610434 | 39 | |
38edf58d AS |
40 | /* |
41 | * This is a global struct for storing common data for all the devices | |
42 | * this driver handles. | |
43 | * | |
44 | * Mainly, it has a linked list for all the consoles in one place so | |
45 | * that callbacks from hvc for get_chars(), put_chars() work properly | |
46 | * across multiple devices and multiple ports per device. | |
47 | */ | |
48 | struct ports_driver_data { | |
fb08bd27 AS |
49 | /* Used for registering chardevs */ |
50 | struct class *class; | |
51 | ||
d99393ef AS |
52 | /* Used for exporting per-port information to debugfs */ |
53 | struct dentry *debugfs_dir; | |
54 | ||
6bdf2afd AS |
55 | /* List of all the devices we're handling */ |
56 | struct list_head portdevs; | |
57 | ||
fb08bd27 AS |
58 | /* Number of devices this driver is handling */ |
59 | unsigned int index; | |
60 | ||
d8a02bd5 RR |
61 | /* |
62 | * This is used to keep track of the number of hvc consoles | |
63 | * spawned by this driver. This number is given as the first | |
64 | * argument to hvc_alloc(). To correctly map an initial | |
65 | * console spawned via hvc_instantiate to the console being | |
66 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
67 | * | |
68 | * We also just assume the first console being initialised was | |
69 | * the first one that got used as the initial console. | |
70 | */ | |
71 | unsigned int next_vtermno; | |
72 | ||
38edf58d AS |
73 | /* All the console devices handled by this driver */ |
74 | struct list_head consoles; | |
75 | }; | |
76 | static struct ports_driver_data pdrvdata; | |
77 | ||
78 | DEFINE_SPINLOCK(pdrvdata_lock); | |
5e38483b | 79 | DECLARE_COMPLETION(early_console_added); |
38edf58d | 80 | |
4f23c573 AS |
81 | /* This struct holds information that's relevant only for console ports */ |
82 | struct console { | |
83 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
84 | struct list_head list; | |
85 | ||
86 | /* The hvc device associated with this console port */ | |
87 | struct hvc_struct *hvc; | |
88 | ||
9778829c AS |
89 | /* The size of the console */ |
90 | struct winsize ws; | |
91 | ||
4f23c573 AS |
92 | /* |
93 | * This number identifies the number that we used to register | |
94 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
95 | * number passed on by the hvc callbacks to us to | |
96 | * differentiate between the other console ports handled by | |
97 | * this driver | |
98 | */ | |
99 | u32 vtermno; | |
100 | }; | |
101 | ||
fdb9a054 AS |
102 | struct port_buffer { |
103 | char *buf; | |
104 | ||
105 | /* size of the buffer in *buf above */ | |
106 | size_t size; | |
107 | ||
108 | /* used length of the buffer */ | |
109 | size_t len; | |
110 | /* offset in the buf from which to consume data */ | |
111 | size_t offset; | |
112 | }; | |
113 | ||
17634ba2 AS |
114 | /* |
115 | * This is a per-device struct that stores data common to all the | |
116 | * ports for that device (vdev->priv). | |
117 | */ | |
118 | struct ports_device { | |
6bdf2afd AS |
119 | /* Next portdev in the list, head is in the pdrvdata struct */ |
120 | struct list_head list; | |
121 | ||
17634ba2 AS |
122 | /* |
123 | * Workqueue handlers where we process deferred work after | |
124 | * notification | |
125 | */ | |
126 | struct work_struct control_work; | |
127 | ||
128 | struct list_head ports; | |
129 | ||
130 | /* To protect the list of ports */ | |
131 | spinlock_t ports_lock; | |
132 | ||
133 | /* To protect the vq operations for the control channel */ | |
134 | spinlock_t cvq_lock; | |
135 | ||
136 | /* The current config space is stored here */ | |
b99fa815 | 137 | struct virtio_console_config config; |
17634ba2 AS |
138 | |
139 | /* The virtio device we're associated with */ | |
140 | struct virtio_device *vdev; | |
141 | ||
142 | /* | |
143 | * A couple of virtqueues for the control channel: one for | |
144 | * guest->host transfers, one for host->guest transfers | |
145 | */ | |
146 | struct virtqueue *c_ivq, *c_ovq; | |
147 | ||
148 | /* Array of per-port IO virtqueues */ | |
149 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
150 | |
151 | /* Used for numbering devices for sysfs and debugfs */ | |
152 | unsigned int drv_index; | |
153 | ||
154 | /* Major number for this device. Ports will be created as minors. */ | |
155 | int chr_major; | |
17634ba2 AS |
156 | }; |
157 | ||
17e5b4f2 AS |
158 | struct port_stats { |
159 | unsigned long bytes_sent, bytes_received, bytes_discarded; | |
160 | }; | |
161 | ||
1c85bf35 | 162 | /* This struct holds the per-port data */ |
21206ede | 163 | struct port { |
17634ba2 AS |
164 | /* Next port in the list, head is in the ports_device */ |
165 | struct list_head list; | |
166 | ||
1c85bf35 AS |
167 | /* Pointer to the parent virtio_console device */ |
168 | struct ports_device *portdev; | |
fdb9a054 AS |
169 | |
170 | /* The current buffer from which data has to be fed to readers */ | |
171 | struct port_buffer *inbuf; | |
21206ede | 172 | |
203baab8 AS |
173 | /* |
174 | * To protect the operations on the in_vq associated with this | |
175 | * port. Has to be a spinlock because it can be called from | |
176 | * interrupt context (get_char()). | |
177 | */ | |
178 | spinlock_t inbuf_lock; | |
179 | ||
cdfadfc1 AS |
180 | /* Protect the operations on the out_vq. */ |
181 | spinlock_t outvq_lock; | |
182 | ||
1c85bf35 AS |
183 | /* The IO vqs for this port */ |
184 | struct virtqueue *in_vq, *out_vq; | |
185 | ||
d99393ef AS |
186 | /* File in the debugfs directory that exposes this port's information */ |
187 | struct dentry *debugfs_file; | |
188 | ||
17e5b4f2 AS |
189 | /* |
190 | * Keep count of the bytes sent, received and discarded for | |
191 | * this port for accounting and debugging purposes. These | |
192 | * counts are not reset across port open / close events. | |
193 | */ | |
194 | struct port_stats stats; | |
195 | ||
4f23c573 AS |
196 | /* |
197 | * The entries in this struct will be valid if this port is | |
198 | * hooked up to an hvc console | |
199 | */ | |
200 | struct console cons; | |
17634ba2 | 201 | |
fb08bd27 | 202 | /* Each port associates with a separate char device */ |
d22a6989 | 203 | struct cdev *cdev; |
fb08bd27 AS |
204 | struct device *dev; |
205 | ||
b353a6b8 AS |
206 | /* Reference-counting to handle port hot-unplugs and file operations */ |
207 | struct kref kref; | |
208 | ||
2030fa49 AS |
209 | /* A waitqueue for poll() or blocking read operations */ |
210 | wait_queue_head_t waitqueue; | |
211 | ||
431edb8a AS |
212 | /* The 'name' of the port that we expose via sysfs properties */ |
213 | char *name; | |
214 | ||
3eae0ade AS |
215 | /* We can notify apps of host connect / disconnect events via SIGIO */ |
216 | struct fasync_struct *async_queue; | |
217 | ||
17634ba2 AS |
218 | /* The 'id' to identify the port with the Host */ |
219 | u32 id; | |
2030fa49 | 220 | |
cdfadfc1 AS |
221 | bool outvq_full; |
222 | ||
2030fa49 AS |
223 | /* Is the host device open */ |
224 | bool host_connected; | |
3c7969cc AS |
225 | |
226 | /* We should allow only one process to open a port */ | |
227 | bool guest_connected; | |
21206ede | 228 | }; |
31610434 | 229 | |
971f3390 RR |
230 | /* This is the very early arch-specified put chars function. */ |
231 | static int (*early_put_chars)(u32, const char *, int); | |
232 | ||
38edf58d AS |
233 | static struct port *find_port_by_vtermno(u32 vtermno) |
234 | { | |
235 | struct port *port; | |
4f23c573 | 236 | struct console *cons; |
38edf58d AS |
237 | unsigned long flags; |
238 | ||
239 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
240 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
241 | if (cons->vtermno == vtermno) { | |
242 | port = container_of(cons, struct port, cons); | |
38edf58d | 243 | goto out; |
4f23c573 | 244 | } |
38edf58d AS |
245 | } |
246 | port = NULL; | |
247 | out: | |
248 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
249 | return port; | |
250 | } | |
251 | ||
04950cdf AS |
252 | static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, |
253 | dev_t dev) | |
254 | { | |
255 | struct port *port; | |
256 | unsigned long flags; | |
257 | ||
258 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
259 | list_for_each_entry(port, &portdev->ports, list) | |
d22a6989 | 260 | if (port->cdev->dev == dev) |
04950cdf AS |
261 | goto out; |
262 | port = NULL; | |
263 | out: | |
264 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
265 | ||
266 | return port; | |
267 | } | |
268 | ||
269 | static struct port *find_port_by_devt(dev_t dev) | |
270 | { | |
271 | struct ports_device *portdev; | |
272 | struct port *port; | |
273 | unsigned long flags; | |
274 | ||
275 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
276 | list_for_each_entry(portdev, &pdrvdata.portdevs, list) { | |
277 | port = find_port_by_devt_in_portdev(portdev, dev); | |
278 | if (port) | |
279 | goto out; | |
280 | } | |
281 | port = NULL; | |
282 | out: | |
283 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
284 | return port; | |
285 | } | |
286 | ||
17634ba2 AS |
287 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
288 | { | |
289 | struct port *port; | |
290 | unsigned long flags; | |
291 | ||
292 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
293 | list_for_each_entry(port, &portdev->ports, list) | |
294 | if (port->id == id) | |
295 | goto out; | |
296 | port = NULL; | |
297 | out: | |
298 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
299 | ||
300 | return port; | |
301 | } | |
302 | ||
203baab8 AS |
303 | static struct port *find_port_by_vq(struct ports_device *portdev, |
304 | struct virtqueue *vq) | |
305 | { | |
306 | struct port *port; | |
203baab8 AS |
307 | unsigned long flags; |
308 | ||
17634ba2 AS |
309 | spin_lock_irqsave(&portdev->ports_lock, flags); |
310 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
311 | if (port->in_vq == vq || port->out_vq == vq) |
312 | goto out; | |
203baab8 AS |
313 | port = NULL; |
314 | out: | |
17634ba2 | 315 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
316 | return port; |
317 | } | |
318 | ||
17634ba2 AS |
319 | static bool is_console_port(struct port *port) |
320 | { | |
321 | if (port->cons.hvc) | |
322 | return true; | |
323 | return false; | |
324 | } | |
325 | ||
326 | static inline bool use_multiport(struct ports_device *portdev) | |
327 | { | |
328 | /* | |
329 | * This condition can be true when put_chars is called from | |
330 | * early_init | |
331 | */ | |
332 | if (!portdev->vdev) | |
333 | return 0; | |
334 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
335 | } | |
336 | ||
fdb9a054 AS |
337 | static void free_buf(struct port_buffer *buf) |
338 | { | |
339 | kfree(buf->buf); | |
340 | kfree(buf); | |
341 | } | |
342 | ||
343 | static struct port_buffer *alloc_buf(size_t buf_size) | |
344 | { | |
345 | struct port_buffer *buf; | |
346 | ||
347 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
348 | if (!buf) | |
349 | goto fail; | |
350 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
351 | if (!buf->buf) | |
352 | goto free_buf; | |
353 | buf->len = 0; | |
354 | buf->offset = 0; | |
355 | buf->size = buf_size; | |
356 | return buf; | |
357 | ||
358 | free_buf: | |
359 | kfree(buf); | |
360 | fail: | |
361 | return NULL; | |
362 | } | |
363 | ||
a3cde449 | 364 | /* Callers should take appropriate locks */ |
defde669 | 365 | static struct port_buffer *get_inbuf(struct port *port) |
a3cde449 AS |
366 | { |
367 | struct port_buffer *buf; | |
a3cde449 AS |
368 | unsigned int len; |
369 | ||
d25a9dda AS |
370 | if (port->inbuf) |
371 | return port->inbuf; | |
372 | ||
373 | buf = virtqueue_get_buf(port->in_vq, &len); | |
a3cde449 AS |
374 | if (buf) { |
375 | buf->len = len; | |
376 | buf->offset = 0; | |
17e5b4f2 | 377 | port->stats.bytes_received += len; |
a3cde449 AS |
378 | } |
379 | return buf; | |
380 | } | |
381 | ||
e27b5198 AS |
382 | /* |
383 | * Create a scatter-gather list representing our input buffer and put | |
384 | * it in the queue. | |
385 | * | |
386 | * Callers should take appropriate locks. | |
387 | */ | |
203baab8 | 388 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
389 | { |
390 | struct scatterlist sg[1]; | |
203baab8 | 391 | int ret; |
1c85bf35 | 392 | |
e27b5198 AS |
393 | sg_init_one(sg, buf->buf, buf->size); |
394 | ||
f96fde41 | 395 | ret = virtqueue_add_buf(vq, sg, 0, 1, buf, GFP_ATOMIC); |
505b0451 | 396 | virtqueue_kick(vq); |
203baab8 AS |
397 | return ret; |
398 | } | |
399 | ||
88f251ac AS |
400 | /* Discard any unread data this port has. Callers lockers. */ |
401 | static void discard_port_data(struct port *port) | |
402 | { | |
403 | struct port_buffer *buf; | |
2d24cdaa | 404 | unsigned int err; |
88f251ac | 405 | |
d7a62cd0 AS |
406 | if (!port->portdev) { |
407 | /* Device has been unplugged. vqs are already gone. */ | |
408 | return; | |
409 | } | |
2d24cdaa | 410 | buf = get_inbuf(port); |
88f251ac | 411 | |
ce072a0c | 412 | err = 0; |
d6933561 | 413 | while (buf) { |
17e5b4f2 | 414 | port->stats.bytes_discarded += buf->len - buf->offset; |
2d24cdaa | 415 | if (add_inbuf(port->in_vq, buf) < 0) { |
ce072a0c | 416 | err++; |
d6933561 AS |
417 | free_buf(buf); |
418 | } | |
2d24cdaa AS |
419 | port->inbuf = NULL; |
420 | buf = get_inbuf(port); | |
88f251ac | 421 | } |
ce072a0c | 422 | if (err) |
d6933561 | 423 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", |
ce072a0c | 424 | err); |
88f251ac AS |
425 | } |
426 | ||
203baab8 AS |
427 | static bool port_has_data(struct port *port) |
428 | { | |
429 | unsigned long flags; | |
430 | bool ret; | |
431 | ||
d25a9dda | 432 | ret = false; |
203baab8 | 433 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 434 | port->inbuf = get_inbuf(port); |
d25a9dda | 435 | if (port->inbuf) |
d6933561 | 436 | ret = true; |
d25a9dda | 437 | |
203baab8 | 438 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
439 | return ret; |
440 | } | |
441 | ||
3425e706 AS |
442 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
443 | unsigned int event, unsigned int value) | |
17634ba2 AS |
444 | { |
445 | struct scatterlist sg[1]; | |
446 | struct virtio_console_control cpkt; | |
447 | struct virtqueue *vq; | |
604b2ad7 | 448 | unsigned int len; |
17634ba2 | 449 | |
3425e706 | 450 | if (!use_multiport(portdev)) |
17634ba2 AS |
451 | return 0; |
452 | ||
3425e706 | 453 | cpkt.id = port_id; |
17634ba2 AS |
454 | cpkt.event = event; |
455 | cpkt.value = value; | |
456 | ||
3425e706 | 457 | vq = portdev->c_ovq; |
17634ba2 AS |
458 | |
459 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
f96fde41 | 460 | if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt, GFP_ATOMIC) >= 0) { |
505b0451 MT |
461 | virtqueue_kick(vq); |
462 | while (!virtqueue_get_buf(vq, &len)) | |
17634ba2 AS |
463 | cpu_relax(); |
464 | } | |
465 | return 0; | |
466 | } | |
467 | ||
3425e706 AS |
468 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
469 | unsigned int value) | |
470 | { | |
84ec06c5 AS |
471 | /* Did the port get unplugged before userspace closed it? */ |
472 | if (port->portdev) | |
473 | return __send_control_msg(port->portdev, port->id, event, value); | |
474 | return 0; | |
3425e706 AS |
475 | } |
476 | ||
cdfadfc1 AS |
477 | /* Callers must take the port->outvq_lock */ |
478 | static void reclaim_consumed_buffers(struct port *port) | |
479 | { | |
480 | void *buf; | |
481 | unsigned int len; | |
482 | ||
d7a62cd0 AS |
483 | if (!port->portdev) { |
484 | /* Device has been unplugged. vqs are already gone. */ | |
485 | return; | |
486 | } | |
cdfadfc1 AS |
487 | while ((buf = virtqueue_get_buf(port->out_vq, &len))) { |
488 | kfree(buf); | |
489 | port->outvq_full = false; | |
490 | } | |
491 | } | |
492 | ||
493 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count, | |
494 | bool nonblock) | |
f997f00b AS |
495 | { |
496 | struct scatterlist sg[1]; | |
497 | struct virtqueue *out_vq; | |
498 | ssize_t ret; | |
cdfadfc1 | 499 | unsigned long flags; |
f997f00b AS |
500 | unsigned int len; |
501 | ||
502 | out_vq = port->out_vq; | |
503 | ||
cdfadfc1 AS |
504 | spin_lock_irqsave(&port->outvq_lock, flags); |
505 | ||
506 | reclaim_consumed_buffers(port); | |
507 | ||
f997f00b | 508 | sg_init_one(sg, in_buf, in_count); |
f96fde41 | 509 | ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf, GFP_ATOMIC); |
f997f00b AS |
510 | |
511 | /* Tell Host to go! */ | |
505b0451 | 512 | virtqueue_kick(out_vq); |
f997f00b AS |
513 | |
514 | if (ret < 0) { | |
9ff4cfab | 515 | in_count = 0; |
cdfadfc1 | 516 | goto done; |
f997f00b AS |
517 | } |
518 | ||
cdfadfc1 AS |
519 | if (ret == 0) |
520 | port->outvq_full = true; | |
521 | ||
522 | if (nonblock) | |
523 | goto done; | |
524 | ||
525 | /* | |
526 | * Wait till the host acknowledges it pushed out the data we | |
531295e6 AS |
527 | * sent. This is done for data from the hvc_console; the tty |
528 | * operations are performed with spinlocks held so we can't | |
529 | * sleep here. An alternative would be to copy the data to a | |
530 | * buffer and relax the spinning requirement. The downside is | |
531 | * we need to kmalloc a GFP_ATOMIC buffer each time the | |
532 | * console driver writes something out. | |
cdfadfc1 | 533 | */ |
505b0451 | 534 | while (!virtqueue_get_buf(out_vq, &len)) |
f997f00b | 535 | cpu_relax(); |
cdfadfc1 AS |
536 | done: |
537 | spin_unlock_irqrestore(&port->outvq_lock, flags); | |
17e5b4f2 AS |
538 | |
539 | port->stats.bytes_sent += in_count; | |
cdfadfc1 AS |
540 | /* |
541 | * We're expected to return the amount of data we wrote -- all | |
542 | * of it | |
543 | */ | |
9ff4cfab | 544 | return in_count; |
f997f00b AS |
545 | } |
546 | ||
203baab8 AS |
547 | /* |
548 | * Give out the data that's requested from the buffer that we have | |
549 | * queued up. | |
550 | */ | |
b766ceed AS |
551 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
552 | bool to_user) | |
203baab8 AS |
553 | { |
554 | struct port_buffer *buf; | |
555 | unsigned long flags; | |
556 | ||
557 | if (!out_count || !port_has_data(port)) | |
558 | return 0; | |
559 | ||
560 | buf = port->inbuf; | |
b766ceed | 561 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 562 | |
b766ceed AS |
563 | if (to_user) { |
564 | ssize_t ret; | |
565 | ||
566 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
567 | if (ret) | |
568 | return -EFAULT; | |
569 | } else { | |
570 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
571 | } | |
203baab8 | 572 | |
203baab8 AS |
573 | buf->offset += out_count; |
574 | ||
575 | if (buf->offset == buf->len) { | |
576 | /* | |
577 | * We're done using all the data in this buffer. | |
578 | * Re-queue so that the Host can send us more data. | |
579 | */ | |
580 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
581 | port->inbuf = NULL; | |
582 | ||
583 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 584 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
585 | |
586 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
587 | } | |
b766ceed | 588 | /* Return the number of bytes actually copied */ |
203baab8 | 589 | return out_count; |
e27b5198 AS |
590 | } |
591 | ||
2030fa49 | 592 | /* The condition that must be true for polling to end */ |
60caacd3 | 593 | static bool will_read_block(struct port *port) |
2030fa49 | 594 | { |
3709ea7a AS |
595 | if (!port->guest_connected) { |
596 | /* Port got hot-unplugged. Let's exit. */ | |
597 | return false; | |
598 | } | |
60caacd3 | 599 | return !port_has_data(port) && port->host_connected; |
2030fa49 AS |
600 | } |
601 | ||
cdfadfc1 AS |
602 | static bool will_write_block(struct port *port) |
603 | { | |
604 | bool ret; | |
605 | ||
60e5e0b8 AS |
606 | if (!port->guest_connected) { |
607 | /* Port got hot-unplugged. Let's exit. */ | |
608 | return false; | |
609 | } | |
cdfadfc1 AS |
610 | if (!port->host_connected) |
611 | return true; | |
612 | ||
613 | spin_lock_irq(&port->outvq_lock); | |
614 | /* | |
615 | * Check if the Host has consumed any buffers since we last | |
616 | * sent data (this is only applicable for nonblocking ports). | |
617 | */ | |
618 | reclaim_consumed_buffers(port); | |
619 | ret = port->outvq_full; | |
620 | spin_unlock_irq(&port->outvq_lock); | |
621 | ||
622 | return ret; | |
623 | } | |
624 | ||
2030fa49 AS |
625 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, |
626 | size_t count, loff_t *offp) | |
627 | { | |
628 | struct port *port; | |
629 | ssize_t ret; | |
630 | ||
631 | port = filp->private_data; | |
632 | ||
633 | if (!port_has_data(port)) { | |
634 | /* | |
635 | * If nothing's connected on the host just return 0 in | |
636 | * case of list_empty; this tells the userspace app | |
637 | * that there's no connection | |
638 | */ | |
639 | if (!port->host_connected) | |
640 | return 0; | |
641 | if (filp->f_flags & O_NONBLOCK) | |
642 | return -EAGAIN; | |
643 | ||
a08fa92d AS |
644 | ret = wait_event_freezable(port->waitqueue, |
645 | !will_read_block(port)); | |
2030fa49 AS |
646 | if (ret < 0) |
647 | return ret; | |
648 | } | |
b3dddb9e AS |
649 | /* Port got hot-unplugged. */ |
650 | if (!port->guest_connected) | |
651 | return -ENODEV; | |
2030fa49 AS |
652 | /* |
653 | * We could've received a disconnection message while we were | |
654 | * waiting for more data. | |
655 | * | |
656 | * This check is not clubbed in the if() statement above as we | |
657 | * might receive some data as well as the host could get | |
658 | * disconnected after we got woken up from our wait. So we | |
659 | * really want to give off whatever data we have and only then | |
660 | * check for host_connected. | |
661 | */ | |
662 | if (!port_has_data(port) && !port->host_connected) | |
663 | return 0; | |
664 | ||
665 | return fill_readbuf(port, ubuf, count, true); | |
666 | } | |
667 | ||
668 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
669 | size_t count, loff_t *offp) | |
670 | { | |
671 | struct port *port; | |
672 | char *buf; | |
673 | ssize_t ret; | |
cdfadfc1 | 674 | bool nonblock; |
2030fa49 | 675 | |
65745422 AS |
676 | /* Userspace could be out to fool us */ |
677 | if (!count) | |
678 | return 0; | |
679 | ||
2030fa49 AS |
680 | port = filp->private_data; |
681 | ||
cdfadfc1 AS |
682 | nonblock = filp->f_flags & O_NONBLOCK; |
683 | ||
684 | if (will_write_block(port)) { | |
685 | if (nonblock) | |
686 | return -EAGAIN; | |
687 | ||
a08fa92d AS |
688 | ret = wait_event_freezable(port->waitqueue, |
689 | !will_write_block(port)); | |
cdfadfc1 AS |
690 | if (ret < 0) |
691 | return ret; | |
692 | } | |
f4028119 AS |
693 | /* Port got hot-unplugged. */ |
694 | if (!port->guest_connected) | |
695 | return -ENODEV; | |
cdfadfc1 | 696 | |
2030fa49 AS |
697 | count = min((size_t)(32 * 1024), count); |
698 | ||
699 | buf = kmalloc(count, GFP_KERNEL); | |
700 | if (!buf) | |
701 | return -ENOMEM; | |
702 | ||
703 | ret = copy_from_user(buf, ubuf, count); | |
704 | if (ret) { | |
705 | ret = -EFAULT; | |
706 | goto free_buf; | |
707 | } | |
708 | ||
531295e6 AS |
709 | /* |
710 | * We now ask send_buf() to not spin for generic ports -- we | |
711 | * can re-use the same code path that non-blocking file | |
712 | * descriptors take for blocking file descriptors since the | |
713 | * wait is already done and we're certain the write will go | |
714 | * through to the host. | |
715 | */ | |
716 | nonblock = true; | |
cdfadfc1 AS |
717 | ret = send_buf(port, buf, count, nonblock); |
718 | ||
719 | if (nonblock && ret > 0) | |
720 | goto out; | |
721 | ||
2030fa49 AS |
722 | free_buf: |
723 | kfree(buf); | |
cdfadfc1 | 724 | out: |
2030fa49 AS |
725 | return ret; |
726 | } | |
727 | ||
728 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
729 | { | |
730 | struct port *port; | |
731 | unsigned int ret; | |
732 | ||
733 | port = filp->private_data; | |
734 | poll_wait(filp, &port->waitqueue, wait); | |
735 | ||
8529a504 AS |
736 | if (!port->guest_connected) { |
737 | /* Port got unplugged */ | |
738 | return POLLHUP; | |
739 | } | |
2030fa49 | 740 | ret = 0; |
6df7aadc | 741 | if (!will_read_block(port)) |
2030fa49 | 742 | ret |= POLLIN | POLLRDNORM; |
cdfadfc1 | 743 | if (!will_write_block(port)) |
2030fa49 AS |
744 | ret |= POLLOUT; |
745 | if (!port->host_connected) | |
746 | ret |= POLLHUP; | |
747 | ||
748 | return ret; | |
749 | } | |
750 | ||
b353a6b8 AS |
751 | static void remove_port(struct kref *kref); |
752 | ||
2030fa49 AS |
753 | static int port_fops_release(struct inode *inode, struct file *filp) |
754 | { | |
755 | struct port *port; | |
756 | ||
757 | port = filp->private_data; | |
758 | ||
759 | /* Notify host of port being closed */ | |
760 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
761 | ||
88f251ac | 762 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
763 | port->guest_connected = false; |
764 | ||
88f251ac AS |
765 | discard_port_data(port); |
766 | ||
767 | spin_unlock_irq(&port->inbuf_lock); | |
768 | ||
cdfadfc1 AS |
769 | spin_lock_irq(&port->outvq_lock); |
770 | reclaim_consumed_buffers(port); | |
771 | spin_unlock_irq(&port->outvq_lock); | |
772 | ||
b353a6b8 AS |
773 | /* |
774 | * Locks aren't necessary here as a port can't be opened after | |
775 | * unplug, and if a port isn't unplugged, a kref would already | |
776 | * exist for the port. Plus, taking ports_lock here would | |
777 | * create a dependency on other locks taken by functions | |
778 | * inside remove_port if we're the last holder of the port, | |
779 | * creating many problems. | |
780 | */ | |
781 | kref_put(&port->kref, remove_port); | |
782 | ||
2030fa49 AS |
783 | return 0; |
784 | } | |
785 | ||
786 | static int port_fops_open(struct inode *inode, struct file *filp) | |
787 | { | |
788 | struct cdev *cdev = inode->i_cdev; | |
789 | struct port *port; | |
8ad37e83 | 790 | int ret; |
2030fa49 | 791 | |
04950cdf | 792 | port = find_port_by_devt(cdev->dev); |
2030fa49 AS |
793 | filp->private_data = port; |
794 | ||
b353a6b8 AS |
795 | /* Prevent against a port getting hot-unplugged at the same time */ |
796 | spin_lock_irq(&port->portdev->ports_lock); | |
797 | kref_get(&port->kref); | |
798 | spin_unlock_irq(&port->portdev->ports_lock); | |
799 | ||
2030fa49 AS |
800 | /* |
801 | * Don't allow opening of console port devices -- that's done | |
802 | * via /dev/hvc | |
803 | */ | |
8ad37e83 AS |
804 | if (is_console_port(port)) { |
805 | ret = -ENXIO; | |
806 | goto out; | |
807 | } | |
2030fa49 | 808 | |
3c7969cc AS |
809 | /* Allow only one process to open a particular port at a time */ |
810 | spin_lock_irq(&port->inbuf_lock); | |
811 | if (port->guest_connected) { | |
812 | spin_unlock_irq(&port->inbuf_lock); | |
8ad37e83 AS |
813 | ret = -EMFILE; |
814 | goto out; | |
3c7969cc AS |
815 | } |
816 | ||
817 | port->guest_connected = true; | |
818 | spin_unlock_irq(&port->inbuf_lock); | |
819 | ||
cdfadfc1 AS |
820 | spin_lock_irq(&port->outvq_lock); |
821 | /* | |
822 | * There might be a chance that we missed reclaiming a few | |
823 | * buffers in the window of the port getting previously closed | |
824 | * and opening now. | |
825 | */ | |
826 | reclaim_consumed_buffers(port); | |
827 | spin_unlock_irq(&port->outvq_lock); | |
828 | ||
299fb61c AS |
829 | nonseekable_open(inode, filp); |
830 | ||
2030fa49 AS |
831 | /* Notify host of port being opened */ |
832 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
833 | ||
834 | return 0; | |
8ad37e83 | 835 | out: |
b353a6b8 | 836 | kref_put(&port->kref, remove_port); |
8ad37e83 | 837 | return ret; |
2030fa49 AS |
838 | } |
839 | ||
3eae0ade AS |
840 | static int port_fops_fasync(int fd, struct file *filp, int mode) |
841 | { | |
842 | struct port *port; | |
843 | ||
844 | port = filp->private_data; | |
845 | return fasync_helper(fd, filp, mode, &port->async_queue); | |
846 | } | |
847 | ||
2030fa49 AS |
848 | /* |
849 | * The file operations that we support: programs in the guest can open | |
850 | * a console device, read from it, write to it, poll for data and | |
851 | * close it. The devices are at | |
852 | * /dev/vport<device number>p<port number> | |
853 | */ | |
854 | static const struct file_operations port_fops = { | |
855 | .owner = THIS_MODULE, | |
856 | .open = port_fops_open, | |
857 | .read = port_fops_read, | |
858 | .write = port_fops_write, | |
859 | .poll = port_fops_poll, | |
860 | .release = port_fops_release, | |
3eae0ade | 861 | .fasync = port_fops_fasync, |
299fb61c | 862 | .llseek = no_llseek, |
2030fa49 AS |
863 | }; |
864 | ||
a23ea924 RR |
865 | /* |
866 | * The put_chars() callback is pretty straightforward. | |
31610434 | 867 | * |
a23ea924 RR |
868 | * We turn the characters into a scatter-gather list, add it to the |
869 | * output queue and then kick the Host. Then we sit here waiting for | |
870 | * it to finish: inefficient in theory, but in practice | |
871 | * implementations will do it immediately (lguest's Launcher does). | |
872 | */ | |
31610434 RR |
873 | static int put_chars(u32 vtermno, const char *buf, int count) |
874 | { | |
21206ede | 875 | struct port *port; |
38edf58d | 876 | |
162a689a FD |
877 | if (unlikely(early_put_chars)) |
878 | return early_put_chars(vtermno, buf, count); | |
879 | ||
38edf58d AS |
880 | port = find_port_by_vtermno(vtermno); |
881 | if (!port) | |
6dc69f97 | 882 | return -EPIPE; |
31610434 | 883 | |
cdfadfc1 | 884 | return send_buf(port, (void *)buf, count, false); |
31610434 RR |
885 | } |
886 | ||
a23ea924 RR |
887 | /* |
888 | * get_chars() is the callback from the hvc_console infrastructure | |
889 | * when an interrupt is received. | |
31610434 | 890 | * |
203baab8 AS |
891 | * We call out to fill_readbuf that gets us the required data from the |
892 | * buffers that are queued up. | |
a23ea924 | 893 | */ |
31610434 RR |
894 | static int get_chars(u32 vtermno, char *buf, int count) |
895 | { | |
21206ede RR |
896 | struct port *port; |
897 | ||
6dc69f97 AS |
898 | /* If we've not set up the port yet, we have no input to give. */ |
899 | if (unlikely(early_put_chars)) | |
900 | return 0; | |
901 | ||
38edf58d AS |
902 | port = find_port_by_vtermno(vtermno); |
903 | if (!port) | |
6dc69f97 | 904 | return -EPIPE; |
21206ede | 905 | |
31610434 | 906 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 907 | BUG_ON(!port->in_vq); |
31610434 | 908 | |
b766ceed | 909 | return fill_readbuf(port, buf, count, false); |
31610434 | 910 | } |
31610434 | 911 | |
cb06e367 | 912 | static void resize_console(struct port *port) |
c2983458 | 913 | { |
cb06e367 | 914 | struct virtio_device *vdev; |
c2983458 | 915 | |
2de16a49 | 916 | /* The port could have been hot-unplugged */ |
9778829c | 917 | if (!port || !is_console_port(port)) |
2de16a49 AS |
918 | return; |
919 | ||
cb06e367 | 920 | vdev = port->portdev->vdev; |
9778829c AS |
921 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) |
922 | hvc_resize(port->cons.hvc, port->cons.ws); | |
c2983458 CB |
923 | } |
924 | ||
38edf58d | 925 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
926 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
927 | { | |
38edf58d AS |
928 | struct port *port; |
929 | ||
930 | port = find_port_by_vtermno(hp->vtermno); | |
931 | if (!port) | |
932 | return -EINVAL; | |
933 | ||
91fcad19 | 934 | hp->irq_requested = 1; |
cb06e367 | 935 | resize_console(port); |
c2983458 | 936 | |
91fcad19 CB |
937 | return 0; |
938 | } | |
939 | ||
940 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
941 | { | |
942 | hp->irq_requested = 0; | |
943 | } | |
944 | ||
17634ba2 | 945 | /* The operations for console ports. */ |
1dff3996 | 946 | static const struct hv_ops hv_ops = { |
971f3390 RR |
947 | .get_chars = get_chars, |
948 | .put_chars = put_chars, | |
949 | .notifier_add = notifier_add_vio, | |
950 | .notifier_del = notifier_del_vio, | |
951 | .notifier_hangup = notifier_del_vio, | |
952 | }; | |
953 | ||
954 | /* | |
955 | * Console drivers are initialized very early so boot messages can go | |
956 | * out, so we do things slightly differently from the generic virtio | |
957 | * initialization of the net and block drivers. | |
958 | * | |
959 | * At this stage, the console is output-only. It's too early to set | |
960 | * up a virtqueue, so we let the drivers do some boutique early-output | |
961 | * thing. | |
962 | */ | |
963 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
964 | { | |
965 | early_put_chars = put_chars; | |
966 | return hvc_instantiate(0, 0, &hv_ops); | |
967 | } | |
968 | ||
17634ba2 | 969 | int init_port_console(struct port *port) |
cfa6d379 AS |
970 | { |
971 | int ret; | |
972 | ||
973 | /* | |
974 | * The Host's telling us this port is a console port. Hook it | |
975 | * up with an hvc console. | |
976 | * | |
977 | * To set up and manage our virtual console, we call | |
978 | * hvc_alloc(). | |
979 | * | |
980 | * The first argument of hvc_alloc() is the virtual console | |
981 | * number. The second argument is the parameter for the | |
982 | * notification mechanism (like irq number). We currently | |
983 | * leave this as zero, virtqueues have implicit notifications. | |
984 | * | |
985 | * The third argument is a "struct hv_ops" containing the | |
986 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
987 | * pointers. The final argument is the output buffer size: we | |
988 | * can do any size, so we put PAGE_SIZE here. | |
989 | */ | |
990 | port->cons.vtermno = pdrvdata.next_vtermno; | |
991 | ||
992 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
993 | if (IS_ERR(port->cons.hvc)) { | |
994 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
995 | dev_err(port->dev, |
996 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
997 | port->cons.hvc = NULL; |
998 | return ret; | |
999 | } | |
1000 | spin_lock_irq(&pdrvdata_lock); | |
1001 | pdrvdata.next_vtermno++; | |
1002 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
1003 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 1004 | port->guest_connected = true; |
cfa6d379 | 1005 | |
1d05160b AS |
1006 | /* |
1007 | * Start using the new console output if this is the first | |
1008 | * console to come up. | |
1009 | */ | |
1010 | if (early_put_chars) | |
1011 | early_put_chars = NULL; | |
1012 | ||
2030fa49 AS |
1013 | /* Notify host of port being opened */ |
1014 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1015 | ||
cfa6d379 AS |
1016 | return 0; |
1017 | } | |
1018 | ||
431edb8a AS |
1019 | static ssize_t show_port_name(struct device *dev, |
1020 | struct device_attribute *attr, char *buffer) | |
1021 | { | |
1022 | struct port *port; | |
1023 | ||
1024 | port = dev_get_drvdata(dev); | |
1025 | ||
1026 | return sprintf(buffer, "%s\n", port->name); | |
1027 | } | |
1028 | ||
1029 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
1030 | ||
1031 | static struct attribute *port_sysfs_entries[] = { | |
1032 | &dev_attr_name.attr, | |
1033 | NULL | |
1034 | }; | |
1035 | ||
1036 | static struct attribute_group port_attribute_group = { | |
1037 | .name = NULL, /* put in device directory */ | |
1038 | .attrs = port_sysfs_entries, | |
1039 | }; | |
1040 | ||
d99393ef AS |
1041 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, |
1042 | size_t count, loff_t *offp) | |
1043 | { | |
1044 | struct port *port; | |
1045 | char *buf; | |
1046 | ssize_t ret, out_offset, out_count; | |
1047 | ||
1048 | out_count = 1024; | |
1049 | buf = kmalloc(out_count, GFP_KERNEL); | |
1050 | if (!buf) | |
1051 | return -ENOMEM; | |
1052 | ||
1053 | port = filp->private_data; | |
1054 | out_offset = 0; | |
1055 | out_offset += snprintf(buf + out_offset, out_count, | |
1056 | "name: %s\n", port->name ? port->name : ""); | |
1057 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1058 | "guest_connected: %d\n", port->guest_connected); | |
1059 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1060 | "host_connected: %d\n", port->host_connected); | |
cdfadfc1 AS |
1061 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1062 | "outvq_full: %d\n", port->outvq_full); | |
17e5b4f2 AS |
1063 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1064 | "bytes_sent: %lu\n", port->stats.bytes_sent); | |
1065 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1066 | "bytes_received: %lu\n", | |
1067 | port->stats.bytes_received); | |
1068 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1069 | "bytes_discarded: %lu\n", | |
1070 | port->stats.bytes_discarded); | |
d99393ef AS |
1071 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1072 | "is_console: %s\n", | |
1073 | is_console_port(port) ? "yes" : "no"); | |
1074 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1075 | "console_vtermno: %u\n", port->cons.vtermno); | |
1076 | ||
1077 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
1078 | kfree(buf); | |
1079 | return ret; | |
1080 | } | |
1081 | ||
1082 | static const struct file_operations port_debugfs_ops = { | |
1083 | .owner = THIS_MODULE, | |
234e3405 | 1084 | .open = simple_open, |
d99393ef AS |
1085 | .read = debugfs_read, |
1086 | }; | |
1087 | ||
9778829c AS |
1088 | static void set_console_size(struct port *port, u16 rows, u16 cols) |
1089 | { | |
1090 | if (!port || !is_console_port(port)) | |
1091 | return; | |
1092 | ||
1093 | port->cons.ws.ws_row = rows; | |
1094 | port->cons.ws.ws_col = cols; | |
1095 | } | |
1096 | ||
c446f8fc AS |
1097 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
1098 | { | |
1099 | struct port_buffer *buf; | |
1100 | unsigned int nr_added_bufs; | |
1101 | int ret; | |
1102 | ||
1103 | nr_added_bufs = 0; | |
1104 | do { | |
1105 | buf = alloc_buf(PAGE_SIZE); | |
1106 | if (!buf) | |
1107 | break; | |
1108 | ||
1109 | spin_lock_irq(lock); | |
1110 | ret = add_inbuf(vq, buf); | |
1111 | if (ret < 0) { | |
1112 | spin_unlock_irq(lock); | |
1113 | free_buf(buf); | |
1114 | break; | |
1115 | } | |
1116 | nr_added_bufs++; | |
1117 | spin_unlock_irq(lock); | |
1118 | } while (ret > 0); | |
1119 | ||
1120 | return nr_added_bufs; | |
1121 | } | |
1122 | ||
3eae0ade AS |
1123 | static void send_sigio_to_port(struct port *port) |
1124 | { | |
1125 | if (port->async_queue && port->guest_connected) | |
1126 | kill_fasync(&port->async_queue, SIGIO, POLL_OUT); | |
1127 | } | |
1128 | ||
c446f8fc AS |
1129 | static int add_port(struct ports_device *portdev, u32 id) |
1130 | { | |
1131 | char debugfs_name[16]; | |
1132 | struct port *port; | |
1133 | struct port_buffer *buf; | |
1134 | dev_t devt; | |
1135 | unsigned int nr_added_bufs; | |
1136 | int err; | |
1137 | ||
1138 | port = kmalloc(sizeof(*port), GFP_KERNEL); | |
1139 | if (!port) { | |
1140 | err = -ENOMEM; | |
1141 | goto fail; | |
1142 | } | |
b353a6b8 | 1143 | kref_init(&port->kref); |
c446f8fc AS |
1144 | |
1145 | port->portdev = portdev; | |
1146 | port->id = id; | |
1147 | ||
1148 | port->name = NULL; | |
1149 | port->inbuf = NULL; | |
1150 | port->cons.hvc = NULL; | |
3eae0ade | 1151 | port->async_queue = NULL; |
c446f8fc | 1152 | |
9778829c AS |
1153 | port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
1154 | ||
c446f8fc | 1155 | port->host_connected = port->guest_connected = false; |
17e5b4f2 | 1156 | port->stats = (struct port_stats) { 0 }; |
c446f8fc | 1157 | |
cdfadfc1 AS |
1158 | port->outvq_full = false; |
1159 | ||
c446f8fc AS |
1160 | port->in_vq = portdev->in_vqs[port->id]; |
1161 | port->out_vq = portdev->out_vqs[port->id]; | |
1162 | ||
d22a6989 AS |
1163 | port->cdev = cdev_alloc(); |
1164 | if (!port->cdev) { | |
1165 | dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); | |
1166 | err = -ENOMEM; | |
1167 | goto free_port; | |
1168 | } | |
1169 | port->cdev->ops = &port_fops; | |
c446f8fc AS |
1170 | |
1171 | devt = MKDEV(portdev->chr_major, id); | |
d22a6989 | 1172 | err = cdev_add(port->cdev, devt, 1); |
c446f8fc AS |
1173 | if (err < 0) { |
1174 | dev_err(&port->portdev->vdev->dev, | |
1175 | "Error %d adding cdev for port %u\n", err, id); | |
d22a6989 | 1176 | goto free_cdev; |
c446f8fc AS |
1177 | } |
1178 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1179 | devt, port, "vport%up%u", | |
1180 | port->portdev->drv_index, id); | |
1181 | if (IS_ERR(port->dev)) { | |
1182 | err = PTR_ERR(port->dev); | |
1183 | dev_err(&port->portdev->vdev->dev, | |
1184 | "Error %d creating device for port %u\n", | |
1185 | err, id); | |
1186 | goto free_cdev; | |
1187 | } | |
1188 | ||
1189 | spin_lock_init(&port->inbuf_lock); | |
cdfadfc1 | 1190 | spin_lock_init(&port->outvq_lock); |
c446f8fc AS |
1191 | init_waitqueue_head(&port->waitqueue); |
1192 | ||
1193 | /* Fill the in_vq with buffers so the host can send us data. */ | |
1194 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); | |
1195 | if (!nr_added_bufs) { | |
1196 | dev_err(port->dev, "Error allocating inbufs\n"); | |
1197 | err = -ENOMEM; | |
1198 | goto free_device; | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * If we're not using multiport support, this has to be a console port | |
1203 | */ | |
1204 | if (!use_multiport(port->portdev)) { | |
1205 | err = init_port_console(port); | |
1206 | if (err) | |
1207 | goto free_inbufs; | |
1208 | } | |
1209 | ||
1210 | spin_lock_irq(&portdev->ports_lock); | |
1211 | list_add_tail(&port->list, &port->portdev->ports); | |
1212 | spin_unlock_irq(&portdev->ports_lock); | |
1213 | ||
1214 | /* | |
1215 | * Tell the Host we're set so that it can send us various | |
1216 | * configuration parameters for this port (eg, port name, | |
1217 | * caching, whether this is a console port, etc.) | |
1218 | */ | |
1219 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
1220 | ||
1221 | if (pdrvdata.debugfs_dir) { | |
1222 | /* | |
1223 | * Finally, create the debugfs file that we can use to | |
1224 | * inspect a port's state at any time | |
1225 | */ | |
1226 | sprintf(debugfs_name, "vport%up%u", | |
1227 | port->portdev->drv_index, id); | |
1228 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, | |
1229 | pdrvdata.debugfs_dir, | |
1230 | port, | |
1231 | &port_debugfs_ops); | |
1232 | } | |
1233 | return 0; | |
1234 | ||
1235 | free_inbufs: | |
1236 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1237 | free_buf(buf); | |
1238 | free_device: | |
1239 | device_destroy(pdrvdata.class, port->dev->devt); | |
1240 | free_cdev: | |
d22a6989 | 1241 | cdev_del(port->cdev); |
c446f8fc AS |
1242 | free_port: |
1243 | kfree(port); | |
1244 | fail: | |
1245 | /* The host might want to notify management sw about port add failure */ | |
0643e4c6 | 1246 | __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
c446f8fc AS |
1247 | return err; |
1248 | } | |
1249 | ||
b353a6b8 AS |
1250 | /* No users remain, remove all port-specific data. */ |
1251 | static void remove_port(struct kref *kref) | |
1252 | { | |
1253 | struct port *port; | |
1254 | ||
1255 | port = container_of(kref, struct port, kref); | |
1256 | ||
1257 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); | |
1258 | device_destroy(pdrvdata.class, port->dev->devt); | |
1259 | cdev_del(port->cdev); | |
1260 | ||
1261 | kfree(port->name); | |
1262 | ||
1263 | debugfs_remove(port->debugfs_file); | |
1264 | ||
1265 | kfree(port); | |
1266 | } | |
1267 | ||
a0e2dbfc AS |
1268 | static void remove_port_data(struct port *port) |
1269 | { | |
1270 | struct port_buffer *buf; | |
1271 | ||
1272 | /* Remove unused data this port might have received. */ | |
1273 | discard_port_data(port); | |
1274 | ||
1275 | reclaim_consumed_buffers(port); | |
1276 | ||
1277 | /* Remove buffers we queued up for the Host to send us data in. */ | |
1278 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1279 | free_buf(buf); | |
1280 | } | |
1281 | ||
b353a6b8 AS |
1282 | /* |
1283 | * Port got unplugged. Remove port from portdev's list and drop the | |
1284 | * kref reference. If no userspace has this port opened, it will | |
1285 | * result in immediate removal the port. | |
1286 | */ | |
1287 | static void unplug_port(struct port *port) | |
1f7aa42d | 1288 | { |
b353a6b8 AS |
1289 | spin_lock_irq(&port->portdev->ports_lock); |
1290 | list_del(&port->list); | |
1291 | spin_unlock_irq(&port->portdev->ports_lock); | |
1292 | ||
0047634d AS |
1293 | if (port->guest_connected) { |
1294 | port->guest_connected = false; | |
1295 | port->host_connected = false; | |
1296 | wake_up_interruptible(&port->waitqueue); | |
a461e11e AS |
1297 | |
1298 | /* Let the app know the port is going down. */ | |
1299 | send_sigio_to_port(port); | |
0047634d AS |
1300 | } |
1301 | ||
1f7aa42d AS |
1302 | if (is_console_port(port)) { |
1303 | spin_lock_irq(&pdrvdata_lock); | |
1304 | list_del(&port->cons.list); | |
1305 | spin_unlock_irq(&pdrvdata_lock); | |
1306 | hvc_remove(port->cons.hvc); | |
1307 | } | |
1f7aa42d | 1308 | |
a0e2dbfc | 1309 | remove_port_data(port); |
a9cdd485 | 1310 | |
b353a6b8 AS |
1311 | /* |
1312 | * We should just assume the device itself has gone off -- | |
1313 | * else a close on an open port later will try to send out a | |
1314 | * control message. | |
1315 | */ | |
1316 | port->portdev = NULL; | |
d99393ef | 1317 | |
b353a6b8 AS |
1318 | /* |
1319 | * Locks around here are not necessary - a port can't be | |
1320 | * opened after we removed the port struct from ports_list | |
1321 | * above. | |
1322 | */ | |
1323 | kref_put(&port->kref, remove_port); | |
1f7aa42d AS |
1324 | } |
1325 | ||
17634ba2 AS |
1326 | /* Any private messages that the Host and Guest want to share */ |
1327 | static void handle_control_message(struct ports_device *portdev, | |
1328 | struct port_buffer *buf) | |
1329 | { | |
1330 | struct virtio_console_control *cpkt; | |
1331 | struct port *port; | |
431edb8a AS |
1332 | size_t name_size; |
1333 | int err; | |
17634ba2 AS |
1334 | |
1335 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
1336 | ||
1337 | port = find_port_by_id(portdev, cpkt->id); | |
f909f850 | 1338 | if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) { |
17634ba2 AS |
1339 | /* No valid header at start of buffer. Drop it. */ |
1340 | dev_dbg(&portdev->vdev->dev, | |
1341 | "Invalid index %u in control packet\n", cpkt->id); | |
1342 | return; | |
1343 | } | |
1344 | ||
1345 | switch (cpkt->event) { | |
f909f850 AS |
1346 | case VIRTIO_CONSOLE_PORT_ADD: |
1347 | if (port) { | |
1d05160b AS |
1348 | dev_dbg(&portdev->vdev->dev, |
1349 | "Port %u already added\n", port->id); | |
f909f850 AS |
1350 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
1351 | break; | |
1352 | } | |
1353 | if (cpkt->id >= portdev->config.max_nr_ports) { | |
1354 | dev_warn(&portdev->vdev->dev, | |
1355 | "Request for adding port with out-of-bound id %u, max. supported id: %u\n", | |
1356 | cpkt->id, portdev->config.max_nr_ports - 1); | |
1357 | break; | |
1358 | } | |
1359 | add_port(portdev, cpkt->id); | |
1360 | break; | |
1361 | case VIRTIO_CONSOLE_PORT_REMOVE: | |
b353a6b8 | 1362 | unplug_port(port); |
f909f850 | 1363 | break; |
17634ba2 AS |
1364 | case VIRTIO_CONSOLE_CONSOLE_PORT: |
1365 | if (!cpkt->value) | |
1366 | break; | |
1367 | if (is_console_port(port)) | |
1368 | break; | |
1369 | ||
1370 | init_port_console(port); | |
5e38483b | 1371 | complete(&early_console_added); |
17634ba2 AS |
1372 | /* |
1373 | * Could remove the port here in case init fails - but | |
1374 | * have to notify the host first. | |
1375 | */ | |
1376 | break; | |
8345adbf AS |
1377 | case VIRTIO_CONSOLE_RESIZE: { |
1378 | struct { | |
1379 | __u16 rows; | |
1380 | __u16 cols; | |
1381 | } size; | |
1382 | ||
17634ba2 AS |
1383 | if (!is_console_port(port)) |
1384 | break; | |
8345adbf AS |
1385 | |
1386 | memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), | |
1387 | sizeof(size)); | |
1388 | set_console_size(port, size.rows, size.cols); | |
1389 | ||
17634ba2 AS |
1390 | port->cons.hvc->irq_requested = 1; |
1391 | resize_console(port); | |
1392 | break; | |
8345adbf | 1393 | } |
2030fa49 AS |
1394 | case VIRTIO_CONSOLE_PORT_OPEN: |
1395 | port->host_connected = cpkt->value; | |
1396 | wake_up_interruptible(&port->waitqueue); | |
cdfadfc1 AS |
1397 | /* |
1398 | * If the host port got closed and the host had any | |
1399 | * unconsumed buffers, we'll be able to reclaim them | |
1400 | * now. | |
1401 | */ | |
1402 | spin_lock_irq(&port->outvq_lock); | |
1403 | reclaim_consumed_buffers(port); | |
1404 | spin_unlock_irq(&port->outvq_lock); | |
3eae0ade AS |
1405 | |
1406 | /* | |
1407 | * If the guest is connected, it'll be interested in | |
1408 | * knowing the host connection state changed. | |
1409 | */ | |
1410 | send_sigio_to_port(port); | |
2030fa49 | 1411 | break; |
431edb8a | 1412 | case VIRTIO_CONSOLE_PORT_NAME: |
291024ef AS |
1413 | /* |
1414 | * If we woke up after hibernation, we can get this | |
1415 | * again. Skip it in that case. | |
1416 | */ | |
1417 | if (port->name) | |
1418 | break; | |
1419 | ||
431edb8a AS |
1420 | /* |
1421 | * Skip the size of the header and the cpkt to get the size | |
1422 | * of the name that was sent | |
1423 | */ | |
1424 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
1425 | ||
1426 | port->name = kmalloc(name_size, GFP_KERNEL); | |
1427 | if (!port->name) { | |
1428 | dev_err(port->dev, | |
1429 | "Not enough space to store port name\n"); | |
1430 | break; | |
1431 | } | |
1432 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
1433 | name_size - 1); | |
1434 | port->name[name_size - 1] = 0; | |
1435 | ||
1436 | /* | |
1437 | * Since we only have one sysfs attribute, 'name', | |
1438 | * create it only if we have a name for the port. | |
1439 | */ | |
1440 | err = sysfs_create_group(&port->dev->kobj, | |
1441 | &port_attribute_group); | |
ec64213c | 1442 | if (err) { |
431edb8a AS |
1443 | dev_err(port->dev, |
1444 | "Error %d creating sysfs device attributes\n", | |
1445 | err); | |
ec64213c AS |
1446 | } else { |
1447 | /* | |
1448 | * Generate a udev event so that appropriate | |
1449 | * symlinks can be created based on udev | |
1450 | * rules. | |
1451 | */ | |
1452 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
1453 | } | |
431edb8a | 1454 | break; |
17634ba2 AS |
1455 | } |
1456 | } | |
1457 | ||
1458 | static void control_work_handler(struct work_struct *work) | |
1459 | { | |
1460 | struct ports_device *portdev; | |
1461 | struct virtqueue *vq; | |
1462 | struct port_buffer *buf; | |
1463 | unsigned int len; | |
1464 | ||
1465 | portdev = container_of(work, struct ports_device, control_work); | |
1466 | vq = portdev->c_ivq; | |
1467 | ||
1468 | spin_lock(&portdev->cvq_lock); | |
505b0451 | 1469 | while ((buf = virtqueue_get_buf(vq, &len))) { |
17634ba2 AS |
1470 | spin_unlock(&portdev->cvq_lock); |
1471 | ||
1472 | buf->len = len; | |
1473 | buf->offset = 0; | |
1474 | ||
1475 | handle_control_message(portdev, buf); | |
1476 | ||
1477 | spin_lock(&portdev->cvq_lock); | |
1478 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
1479 | dev_warn(&portdev->vdev->dev, | |
1480 | "Error adding buffer to queue\n"); | |
1481 | free_buf(buf); | |
1482 | } | |
1483 | } | |
1484 | spin_unlock(&portdev->cvq_lock); | |
1485 | } | |
1486 | ||
2770c5ea AS |
1487 | static void out_intr(struct virtqueue *vq) |
1488 | { | |
1489 | struct port *port; | |
1490 | ||
1491 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1492 | if (!port) | |
1493 | return; | |
1494 | ||
1495 | wake_up_interruptible(&port->waitqueue); | |
1496 | } | |
1497 | ||
17634ba2 AS |
1498 | static void in_intr(struct virtqueue *vq) |
1499 | { | |
1500 | struct port *port; | |
1501 | unsigned long flags; | |
1502 | ||
1503 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1504 | if (!port) | |
1505 | return; | |
1506 | ||
1507 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d25a9dda | 1508 | port->inbuf = get_inbuf(port); |
17634ba2 | 1509 | |
88f251ac AS |
1510 | /* |
1511 | * Don't queue up data when port is closed. This condition | |
1512 | * can be reached when a console port is not yet connected (no | |
1513 | * tty is spawned) and the host sends out data to console | |
1514 | * ports. For generic serial ports, the host won't | |
1515 | * (shouldn't) send data till the guest is connected. | |
1516 | */ | |
1517 | if (!port->guest_connected) | |
1518 | discard_port_data(port); | |
1519 | ||
17634ba2 AS |
1520 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1521 | ||
2030fa49 AS |
1522 | wake_up_interruptible(&port->waitqueue); |
1523 | ||
55f6bcce AS |
1524 | /* Send a SIGIO indicating new data in case the process asked for it */ |
1525 | send_sigio_to_port(port); | |
1526 | ||
17634ba2 AS |
1527 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1528 | hvc_kick(); | |
1529 | } | |
1530 | ||
1531 | static void control_intr(struct virtqueue *vq) | |
1532 | { | |
1533 | struct ports_device *portdev; | |
1534 | ||
1535 | portdev = vq->vdev->priv; | |
1536 | schedule_work(&portdev->control_work); | |
1537 | } | |
1538 | ||
7f5d810d AS |
1539 | static void config_intr(struct virtio_device *vdev) |
1540 | { | |
1541 | struct ports_device *portdev; | |
1542 | ||
1543 | portdev = vdev->priv; | |
99f905f8 | 1544 | |
4038f5b7 | 1545 | if (!use_multiport(portdev)) { |
9778829c AS |
1546 | struct port *port; |
1547 | u16 rows, cols; | |
1548 | ||
1549 | vdev->config->get(vdev, | |
1550 | offsetof(struct virtio_console_config, cols), | |
1551 | &cols, sizeof(u16)); | |
1552 | vdev->config->get(vdev, | |
1553 | offsetof(struct virtio_console_config, rows), | |
1554 | &rows, sizeof(u16)); | |
1555 | ||
1556 | port = find_port_by_id(portdev, 0); | |
1557 | set_console_size(port, rows, cols); | |
1558 | ||
4038f5b7 AS |
1559 | /* |
1560 | * We'll use this way of resizing only for legacy | |
1561 | * support. For newer userspace | |
1562 | * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages | |
1563 | * to indicate console size changes so that it can be | |
1564 | * done per-port. | |
1565 | */ | |
9778829c | 1566 | resize_console(port); |
4038f5b7 | 1567 | } |
7f5d810d AS |
1568 | } |
1569 | ||
2658a79a AS |
1570 | static int init_vqs(struct ports_device *portdev) |
1571 | { | |
1572 | vq_callback_t **io_callbacks; | |
1573 | char **io_names; | |
1574 | struct virtqueue **vqs; | |
17634ba2 | 1575 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1576 | int err; |
1577 | ||
17634ba2 AS |
1578 | nr_ports = portdev->config.max_nr_ports; |
1579 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1580 | |
1581 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
2658a79a | 1582 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); |
2658a79a | 1583 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); |
2658a79a AS |
1584 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1585 | GFP_KERNEL); | |
2658a79a AS |
1586 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1587 | GFP_KERNEL); | |
22e132ff | 1588 | if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || |
286f9a22 | 1589 | !portdev->out_vqs) { |
2658a79a | 1590 | err = -ENOMEM; |
22e132ff | 1591 | goto free; |
2658a79a AS |
1592 | } |
1593 | ||
17634ba2 AS |
1594 | /* |
1595 | * For backward compat (newer host but older guest), the host | |
1596 | * spawns a console port first and also inits the vqs for port | |
1597 | * 0 before others. | |
1598 | */ | |
1599 | j = 0; | |
1600 | io_callbacks[j] = in_intr; | |
2770c5ea | 1601 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1602 | io_names[j] = "input"; |
1603 | io_names[j + 1] = "output"; | |
1604 | j += 2; | |
1605 | ||
1606 | if (use_multiport(portdev)) { | |
1607 | io_callbacks[j] = control_intr; | |
1608 | io_callbacks[j + 1] = NULL; | |
1609 | io_names[j] = "control-i"; | |
1610 | io_names[j + 1] = "control-o"; | |
1611 | ||
1612 | for (i = 1; i < nr_ports; i++) { | |
1613 | j += 2; | |
1614 | io_callbacks[j] = in_intr; | |
2770c5ea | 1615 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1616 | io_names[j] = "input"; |
1617 | io_names[j + 1] = "output"; | |
1618 | } | |
1619 | } | |
2658a79a AS |
1620 | /* Find the queues. */ |
1621 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1622 | io_callbacks, | |
1623 | (const char **)io_names); | |
1624 | if (err) | |
22e132ff | 1625 | goto free; |
2658a79a | 1626 | |
17634ba2 | 1627 | j = 0; |
2658a79a AS |
1628 | portdev->in_vqs[0] = vqs[0]; |
1629 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1630 | j += 2; |
1631 | if (use_multiport(portdev)) { | |
1632 | portdev->c_ivq = vqs[j]; | |
1633 | portdev->c_ovq = vqs[j + 1]; | |
1634 | ||
1635 | for (i = 1; i < nr_ports; i++) { | |
1636 | j += 2; | |
1637 | portdev->in_vqs[i] = vqs[j]; | |
1638 | portdev->out_vqs[i] = vqs[j + 1]; | |
1639 | } | |
1640 | } | |
2658a79a | 1641 | kfree(io_names); |
22e132ff | 1642 | kfree(io_callbacks); |
2658a79a AS |
1643 | kfree(vqs); |
1644 | ||
1645 | return 0; | |
1646 | ||
22e132ff | 1647 | free: |
2658a79a | 1648 | kfree(portdev->out_vqs); |
2658a79a | 1649 | kfree(portdev->in_vqs); |
22e132ff JS |
1650 | kfree(io_names); |
1651 | kfree(io_callbacks); | |
2658a79a | 1652 | kfree(vqs); |
22e132ff | 1653 | |
2658a79a AS |
1654 | return err; |
1655 | } | |
1656 | ||
fb08bd27 AS |
1657 | static const struct file_operations portdev_fops = { |
1658 | .owner = THIS_MODULE, | |
1659 | }; | |
1660 | ||
a0e2dbfc AS |
1661 | static void remove_vqs(struct ports_device *portdev) |
1662 | { | |
1663 | portdev->vdev->config->del_vqs(portdev->vdev); | |
1664 | kfree(portdev->in_vqs); | |
1665 | kfree(portdev->out_vqs); | |
1666 | } | |
1667 | ||
1668 | static void remove_controlq_data(struct ports_device *portdev) | |
1669 | { | |
1670 | struct port_buffer *buf; | |
1671 | unsigned int len; | |
1672 | ||
1673 | if (!use_multiport(portdev)) | |
1674 | return; | |
1675 | ||
1676 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) | |
1677 | free_buf(buf); | |
1678 | ||
1679 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) | |
1680 | free_buf(buf); | |
1681 | } | |
1682 | ||
1c85bf35 AS |
1683 | /* |
1684 | * Once we're further in boot, we get probed like any other virtio | |
1685 | * device. | |
17634ba2 AS |
1686 | * |
1687 | * If the host also supports multiple console ports, we check the | |
1688 | * config space to see how many ports the host has spawned. We | |
1689 | * initialize each port found. | |
1c85bf35 AS |
1690 | */ |
1691 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1692 | { | |
1c85bf35 AS |
1693 | struct ports_device *portdev; |
1694 | int err; | |
17634ba2 | 1695 | bool multiport; |
5e38483b CB |
1696 | bool early = early_put_chars != NULL; |
1697 | ||
1698 | /* Ensure to read early_put_chars now */ | |
1699 | barrier(); | |
1c85bf35 AS |
1700 | |
1701 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1702 | if (!portdev) { | |
1703 | err = -ENOMEM; | |
1704 | goto fail; | |
1705 | } | |
1706 | ||
1707 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1708 | portdev->vdev = vdev; | |
1709 | vdev->priv = portdev; | |
1710 | ||
fb08bd27 AS |
1711 | spin_lock_irq(&pdrvdata_lock); |
1712 | portdev->drv_index = pdrvdata.index++; | |
1713 | spin_unlock_irq(&pdrvdata_lock); | |
1714 | ||
1715 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1716 | &portdev_fops); | |
1717 | if (portdev->chr_major < 0) { | |
1718 | dev_err(&vdev->dev, | |
1719 | "Error %d registering chrdev for device %u\n", | |
1720 | portdev->chr_major, portdev->drv_index); | |
1721 | err = portdev->chr_major; | |
1722 | goto free; | |
1723 | } | |
1724 | ||
17634ba2 | 1725 | multiport = false; |
17634ba2 | 1726 | portdev->config.max_nr_ports = 1; |
51c6d61a SL |
1727 | if (virtio_config_val(vdev, VIRTIO_CONSOLE_F_MULTIPORT, |
1728 | offsetof(struct virtio_console_config, | |
1729 | max_nr_ports), | |
1730 | &portdev->config.max_nr_ports) == 0) | |
17634ba2 | 1731 | multiport = true; |
17634ba2 | 1732 | |
2658a79a AS |
1733 | err = init_vqs(portdev); |
1734 | if (err < 0) { | |
1735 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1736 | goto free_chrdev; |
2658a79a | 1737 | } |
1c85bf35 | 1738 | |
17634ba2 AS |
1739 | spin_lock_init(&portdev->ports_lock); |
1740 | INIT_LIST_HEAD(&portdev->ports); | |
1741 | ||
1742 | if (multiport) { | |
335a64a5 AS |
1743 | unsigned int nr_added_bufs; |
1744 | ||
17634ba2 AS |
1745 | spin_lock_init(&portdev->cvq_lock); |
1746 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
1747 | ||
335a64a5 AS |
1748 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
1749 | if (!nr_added_bufs) { | |
22a29eac AS |
1750 | dev_err(&vdev->dev, |
1751 | "Error allocating buffers for control queue\n"); | |
1752 | err = -ENOMEM; | |
1753 | goto free_vqs; | |
1754 | } | |
1d05160b AS |
1755 | } else { |
1756 | /* | |
1757 | * For backward compatibility: Create a console port | |
1758 | * if we're running on older host. | |
1759 | */ | |
1760 | add_port(portdev, 0); | |
17634ba2 AS |
1761 | } |
1762 | ||
6bdf2afd AS |
1763 | spin_lock_irq(&pdrvdata_lock); |
1764 | list_add_tail(&portdev->list, &pdrvdata.portdevs); | |
1765 | spin_unlock_irq(&pdrvdata_lock); | |
1766 | ||
f909f850 AS |
1767 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
1768 | VIRTIO_CONSOLE_DEVICE_READY, 1); | |
5e38483b CB |
1769 | |
1770 | /* | |
1771 | * If there was an early virtio console, assume that there are no | |
1772 | * other consoles. We need to wait until the hvc_alloc matches the | |
1773 | * hvc_instantiate, otherwise tty_open will complain, resulting in | |
1774 | * a "Warning: unable to open an initial console" boot failure. | |
1775 | * Without multiport this is done in add_port above. With multiport | |
1776 | * this might take some host<->guest communication - thus we have to | |
1777 | * wait. | |
1778 | */ | |
1779 | if (multiport && early) | |
1780 | wait_for_completion(&early_console_added); | |
1781 | ||
31610434 RR |
1782 | return 0; |
1783 | ||
22a29eac | 1784 | free_vqs: |
0643e4c6 JL |
1785 | /* The host might want to notify mgmt sw about device add failure */ |
1786 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, | |
1787 | VIRTIO_CONSOLE_DEVICE_READY, 0); | |
a0e2dbfc | 1788 | remove_vqs(portdev); |
fb08bd27 AS |
1789 | free_chrdev: |
1790 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1791 | free: |
1c85bf35 | 1792 | kfree(portdev); |
31610434 RR |
1793 | fail: |
1794 | return err; | |
1795 | } | |
1796 | ||
7177876f AS |
1797 | static void virtcons_remove(struct virtio_device *vdev) |
1798 | { | |
1799 | struct ports_device *portdev; | |
1800 | struct port *port, *port2; | |
7177876f AS |
1801 | |
1802 | portdev = vdev->priv; | |
1803 | ||
6bdf2afd AS |
1804 | spin_lock_irq(&pdrvdata_lock); |
1805 | list_del(&portdev->list); | |
1806 | spin_unlock_irq(&pdrvdata_lock); | |
1807 | ||
02238959 AS |
1808 | /* Disable interrupts for vqs */ |
1809 | vdev->config->reset(vdev); | |
1810 | /* Finish up work that's lined up */ | |
7177876f | 1811 | cancel_work_sync(&portdev->control_work); |
7177876f AS |
1812 | |
1813 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
b353a6b8 | 1814 | unplug_port(port); |
7177876f AS |
1815 | |
1816 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
1817 | ||
e062013c AS |
1818 | /* |
1819 | * When yanking out a device, we immediately lose the | |
1820 | * (device-side) queues. So there's no point in keeping the | |
1821 | * guest side around till we drop our final reference. This | |
1822 | * also means that any ports which are in an open state will | |
1823 | * have to just stop using the port, as the vqs are going | |
1824 | * away. | |
1825 | */ | |
a0e2dbfc AS |
1826 | remove_controlq_data(portdev); |
1827 | remove_vqs(portdev); | |
7177876f AS |
1828 | kfree(portdev); |
1829 | } | |
1830 | ||
31610434 RR |
1831 | static struct virtio_device_id id_table[] = { |
1832 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1833 | { 0 }, | |
1834 | }; | |
1835 | ||
c2983458 CB |
1836 | static unsigned int features[] = { |
1837 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 1838 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1839 | }; |
1840 | ||
2b8f41d8 AS |
1841 | #ifdef CONFIG_PM |
1842 | static int virtcons_freeze(struct virtio_device *vdev) | |
1843 | { | |
1844 | struct ports_device *portdev; | |
1845 | struct port *port; | |
1846 | ||
1847 | portdev = vdev->priv; | |
1848 | ||
1849 | vdev->config->reset(vdev); | |
1850 | ||
c743d09d | 1851 | virtqueue_disable_cb(portdev->c_ivq); |
2b8f41d8 | 1852 | cancel_work_sync(&portdev->control_work); |
c743d09d AS |
1853 | /* |
1854 | * Once more: if control_work_handler() was running, it would | |
1855 | * enable the cb as the last step. | |
1856 | */ | |
1857 | virtqueue_disable_cb(portdev->c_ivq); | |
2b8f41d8 AS |
1858 | remove_controlq_data(portdev); |
1859 | ||
1860 | list_for_each_entry(port, &portdev->ports, list) { | |
c743d09d AS |
1861 | virtqueue_disable_cb(port->in_vq); |
1862 | virtqueue_disable_cb(port->out_vq); | |
2b8f41d8 AS |
1863 | /* |
1864 | * We'll ask the host later if the new invocation has | |
1865 | * the port opened or closed. | |
1866 | */ | |
1867 | port->host_connected = false; | |
1868 | remove_port_data(port); | |
1869 | } | |
1870 | remove_vqs(portdev); | |
1871 | ||
1872 | return 0; | |
1873 | } | |
1874 | ||
1875 | static int virtcons_restore(struct virtio_device *vdev) | |
1876 | { | |
1877 | struct ports_device *portdev; | |
1878 | struct port *port; | |
1879 | int ret; | |
1880 | ||
1881 | portdev = vdev->priv; | |
1882 | ||
1883 | ret = init_vqs(portdev); | |
1884 | if (ret) | |
1885 | return ret; | |
1886 | ||
1887 | if (use_multiport(portdev)) | |
1888 | fill_queue(portdev->c_ivq, &portdev->cvq_lock); | |
1889 | ||
1890 | list_for_each_entry(port, &portdev->ports, list) { | |
1891 | port->in_vq = portdev->in_vqs[port->id]; | |
1892 | port->out_vq = portdev->out_vqs[port->id]; | |
1893 | ||
1894 | fill_queue(port->in_vq, &port->inbuf_lock); | |
1895 | ||
1896 | /* Get port open/close status on the host */ | |
1897 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
fa8b66cc AS |
1898 | |
1899 | /* | |
1900 | * If a port was open at the time of suspending, we | |
1901 | * have to let the host know that it's still open. | |
1902 | */ | |
1903 | if (port->guest_connected) | |
1904 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
2b8f41d8 AS |
1905 | } |
1906 | return 0; | |
1907 | } | |
1908 | #endif | |
1909 | ||
31610434 | 1910 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1911 | .feature_table = features, |
1912 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1913 | .driver.name = KBUILD_MODNAME, |
1914 | .driver.owner = THIS_MODULE, | |
1915 | .id_table = id_table, | |
1916 | .probe = virtcons_probe, | |
7177876f | 1917 | .remove = virtcons_remove, |
7f5d810d | 1918 | .config_changed = config_intr, |
2b8f41d8 AS |
1919 | #ifdef CONFIG_PM |
1920 | .freeze = virtcons_freeze, | |
1921 | .restore = virtcons_restore, | |
1922 | #endif | |
31610434 RR |
1923 | }; |
1924 | ||
1925 | static int __init init(void) | |
1926 | { | |
fb08bd27 AS |
1927 | int err; |
1928 | ||
1929 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
1930 | if (IS_ERR(pdrvdata.class)) { | |
1931 | err = PTR_ERR(pdrvdata.class); | |
1932 | pr_err("Error %d creating virtio-ports class\n", err); | |
1933 | return err; | |
1934 | } | |
d99393ef AS |
1935 | |
1936 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
1937 | if (!pdrvdata.debugfs_dir) { | |
1938 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
1939 | PTR_ERR(pdrvdata.debugfs_dir)); | |
1940 | } | |
38edf58d | 1941 | INIT_LIST_HEAD(&pdrvdata.consoles); |
6bdf2afd | 1942 | INIT_LIST_HEAD(&pdrvdata.portdevs); |
38edf58d | 1943 | |
31610434 RR |
1944 | return register_virtio_driver(&virtio_console); |
1945 | } | |
7177876f AS |
1946 | |
1947 | static void __exit fini(void) | |
1948 | { | |
1949 | unregister_virtio_driver(&virtio_console); | |
1950 | ||
1951 | class_destroy(pdrvdata.class); | |
1952 | if (pdrvdata.debugfs_dir) | |
1953 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
1954 | } | |
31610434 | 1955 | module_init(init); |
7177876f | 1956 | module_exit(fini); |
31610434 RR |
1957 | |
1958 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1959 | MODULE_DESCRIPTION("Virtio console driver"); | |
1960 | MODULE_LICENSE("GPL"); |