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Commit | Line | Data |
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a23ea924 RR |
1 | /* |
2 | * Copyright (C) 2006, 2007, 2009 Rusty Russell, IBM Corporation | |
17634ba2 | 3 | * Copyright (C) 2009, 2010 Red Hat, Inc. |
31610434 RR |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
fb08bd27 | 19 | #include <linux/cdev.h> |
d99393ef | 20 | #include <linux/debugfs.h> |
fb08bd27 | 21 | #include <linux/device.h> |
31610434 | 22 | #include <linux/err.h> |
2030fa49 | 23 | #include <linux/fs.h> |
31610434 | 24 | #include <linux/init.h> |
38edf58d | 25 | #include <linux/list.h> |
2030fa49 AS |
26 | #include <linux/poll.h> |
27 | #include <linux/sched.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
38edf58d | 29 | #include <linux/spinlock.h> |
31610434 RR |
30 | #include <linux/virtio.h> |
31 | #include <linux/virtio_console.h> | |
2030fa49 | 32 | #include <linux/wait.h> |
17634ba2 | 33 | #include <linux/workqueue.h> |
31610434 RR |
34 | #include "hvc_console.h" |
35 | ||
38edf58d AS |
36 | /* |
37 | * This is a global struct for storing common data for all the devices | |
38 | * this driver handles. | |
39 | * | |
40 | * Mainly, it has a linked list for all the consoles in one place so | |
41 | * that callbacks from hvc for get_chars(), put_chars() work properly | |
42 | * across multiple devices and multiple ports per device. | |
43 | */ | |
44 | struct ports_driver_data { | |
fb08bd27 AS |
45 | /* Used for registering chardevs */ |
46 | struct class *class; | |
47 | ||
d99393ef AS |
48 | /* Used for exporting per-port information to debugfs */ |
49 | struct dentry *debugfs_dir; | |
50 | ||
fb08bd27 AS |
51 | /* Number of devices this driver is handling */ |
52 | unsigned int index; | |
53 | ||
d8a02bd5 RR |
54 | /* |
55 | * This is used to keep track of the number of hvc consoles | |
56 | * spawned by this driver. This number is given as the first | |
57 | * argument to hvc_alloc(). To correctly map an initial | |
58 | * console spawned via hvc_instantiate to the console being | |
59 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
60 | * | |
61 | * We also just assume the first console being initialised was | |
62 | * the first one that got used as the initial console. | |
63 | */ | |
64 | unsigned int next_vtermno; | |
65 | ||
38edf58d AS |
66 | /* All the console devices handled by this driver */ |
67 | struct list_head consoles; | |
68 | }; | |
69 | static struct ports_driver_data pdrvdata; | |
70 | ||
71 | DEFINE_SPINLOCK(pdrvdata_lock); | |
72 | ||
4f23c573 AS |
73 | /* This struct holds information that's relevant only for console ports */ |
74 | struct console { | |
75 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
76 | struct list_head list; | |
77 | ||
78 | /* The hvc device associated with this console port */ | |
79 | struct hvc_struct *hvc; | |
80 | ||
81 | /* | |
82 | * This number identifies the number that we used to register | |
83 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
84 | * number passed on by the hvc callbacks to us to | |
85 | * differentiate between the other console ports handled by | |
86 | * this driver | |
87 | */ | |
88 | u32 vtermno; | |
89 | }; | |
90 | ||
fdb9a054 AS |
91 | struct port_buffer { |
92 | char *buf; | |
93 | ||
94 | /* size of the buffer in *buf above */ | |
95 | size_t size; | |
96 | ||
97 | /* used length of the buffer */ | |
98 | size_t len; | |
99 | /* offset in the buf from which to consume data */ | |
100 | size_t offset; | |
101 | }; | |
102 | ||
17634ba2 AS |
103 | /* |
104 | * This is a per-device struct that stores data common to all the | |
105 | * ports for that device (vdev->priv). | |
106 | */ | |
107 | struct ports_device { | |
108 | /* | |
109 | * Workqueue handlers where we process deferred work after | |
110 | * notification | |
111 | */ | |
112 | struct work_struct control_work; | |
7f5d810d | 113 | struct work_struct config_work; |
17634ba2 AS |
114 | |
115 | struct list_head ports; | |
116 | ||
117 | /* To protect the list of ports */ | |
118 | spinlock_t ports_lock; | |
119 | ||
120 | /* To protect the vq operations for the control channel */ | |
121 | spinlock_t cvq_lock; | |
122 | ||
123 | /* The current config space is stored here */ | |
b99fa815 | 124 | struct virtio_console_config config; |
17634ba2 AS |
125 | |
126 | /* The virtio device we're associated with */ | |
127 | struct virtio_device *vdev; | |
128 | ||
129 | /* | |
130 | * A couple of virtqueues for the control channel: one for | |
131 | * guest->host transfers, one for host->guest transfers | |
132 | */ | |
133 | struct virtqueue *c_ivq, *c_ovq; | |
134 | ||
135 | /* Array of per-port IO virtqueues */ | |
136 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
137 | |
138 | /* Used for numbering devices for sysfs and debugfs */ | |
139 | unsigned int drv_index; | |
140 | ||
141 | /* Major number for this device. Ports will be created as minors. */ | |
142 | int chr_major; | |
17634ba2 AS |
143 | }; |
144 | ||
1c85bf35 | 145 | /* This struct holds the per-port data */ |
21206ede | 146 | struct port { |
17634ba2 AS |
147 | /* Next port in the list, head is in the ports_device */ |
148 | struct list_head list; | |
149 | ||
1c85bf35 AS |
150 | /* Pointer to the parent virtio_console device */ |
151 | struct ports_device *portdev; | |
fdb9a054 AS |
152 | |
153 | /* The current buffer from which data has to be fed to readers */ | |
154 | struct port_buffer *inbuf; | |
21206ede | 155 | |
203baab8 AS |
156 | /* |
157 | * To protect the operations on the in_vq associated with this | |
158 | * port. Has to be a spinlock because it can be called from | |
159 | * interrupt context (get_char()). | |
160 | */ | |
161 | spinlock_t inbuf_lock; | |
162 | ||
1c85bf35 AS |
163 | /* The IO vqs for this port */ |
164 | struct virtqueue *in_vq, *out_vq; | |
165 | ||
d99393ef AS |
166 | /* File in the debugfs directory that exposes this port's information */ |
167 | struct dentry *debugfs_file; | |
168 | ||
4f23c573 AS |
169 | /* |
170 | * The entries in this struct will be valid if this port is | |
171 | * hooked up to an hvc console | |
172 | */ | |
173 | struct console cons; | |
17634ba2 | 174 | |
fb08bd27 AS |
175 | /* Each port associates with a separate char device */ |
176 | struct cdev cdev; | |
177 | struct device *dev; | |
178 | ||
2030fa49 AS |
179 | /* A waitqueue for poll() or blocking read operations */ |
180 | wait_queue_head_t waitqueue; | |
181 | ||
431edb8a AS |
182 | /* The 'name' of the port that we expose via sysfs properties */ |
183 | char *name; | |
184 | ||
17634ba2 AS |
185 | /* The 'id' to identify the port with the Host */ |
186 | u32 id; | |
2030fa49 AS |
187 | |
188 | /* Is the host device open */ | |
189 | bool host_connected; | |
3c7969cc AS |
190 | |
191 | /* We should allow only one process to open a port */ | |
192 | bool guest_connected; | |
21206ede | 193 | }; |
31610434 | 194 | |
971f3390 RR |
195 | /* This is the very early arch-specified put chars function. */ |
196 | static int (*early_put_chars)(u32, const char *, int); | |
197 | ||
38edf58d AS |
198 | static struct port *find_port_by_vtermno(u32 vtermno) |
199 | { | |
200 | struct port *port; | |
4f23c573 | 201 | struct console *cons; |
38edf58d AS |
202 | unsigned long flags; |
203 | ||
204 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
205 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
206 | if (cons->vtermno == vtermno) { | |
207 | port = container_of(cons, struct port, cons); | |
38edf58d | 208 | goto out; |
4f23c573 | 209 | } |
38edf58d AS |
210 | } |
211 | port = NULL; | |
212 | out: | |
213 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
214 | return port; | |
215 | } | |
216 | ||
17634ba2 AS |
217 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
218 | { | |
219 | struct port *port; | |
220 | unsigned long flags; | |
221 | ||
222 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
223 | list_for_each_entry(port, &portdev->ports, list) | |
224 | if (port->id == id) | |
225 | goto out; | |
226 | port = NULL; | |
227 | out: | |
228 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
229 | ||
230 | return port; | |
231 | } | |
232 | ||
203baab8 AS |
233 | static struct port *find_port_by_vq(struct ports_device *portdev, |
234 | struct virtqueue *vq) | |
235 | { | |
236 | struct port *port; | |
203baab8 AS |
237 | unsigned long flags; |
238 | ||
17634ba2 AS |
239 | spin_lock_irqsave(&portdev->ports_lock, flags); |
240 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
241 | if (port->in_vq == vq || port->out_vq == vq) |
242 | goto out; | |
203baab8 AS |
243 | port = NULL; |
244 | out: | |
17634ba2 | 245 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
246 | return port; |
247 | } | |
248 | ||
17634ba2 AS |
249 | static bool is_console_port(struct port *port) |
250 | { | |
251 | if (port->cons.hvc) | |
252 | return true; | |
253 | return false; | |
254 | } | |
255 | ||
256 | static inline bool use_multiport(struct ports_device *portdev) | |
257 | { | |
258 | /* | |
259 | * This condition can be true when put_chars is called from | |
260 | * early_init | |
261 | */ | |
262 | if (!portdev->vdev) | |
263 | return 0; | |
264 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
265 | } | |
266 | ||
fdb9a054 AS |
267 | static void free_buf(struct port_buffer *buf) |
268 | { | |
269 | kfree(buf->buf); | |
270 | kfree(buf); | |
271 | } | |
272 | ||
273 | static struct port_buffer *alloc_buf(size_t buf_size) | |
274 | { | |
275 | struct port_buffer *buf; | |
276 | ||
277 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
278 | if (!buf) | |
279 | goto fail; | |
280 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
281 | if (!buf->buf) | |
282 | goto free_buf; | |
283 | buf->len = 0; | |
284 | buf->offset = 0; | |
285 | buf->size = buf_size; | |
286 | return buf; | |
287 | ||
288 | free_buf: | |
289 | kfree(buf); | |
290 | fail: | |
291 | return NULL; | |
292 | } | |
293 | ||
a3cde449 AS |
294 | /* Callers should take appropriate locks */ |
295 | static void *get_inbuf(struct port *port) | |
296 | { | |
297 | struct port_buffer *buf; | |
298 | struct virtqueue *vq; | |
299 | unsigned int len; | |
300 | ||
301 | vq = port->in_vq; | |
505b0451 | 302 | buf = virtqueue_get_buf(vq, &len); |
a3cde449 AS |
303 | if (buf) { |
304 | buf->len = len; | |
305 | buf->offset = 0; | |
306 | } | |
307 | return buf; | |
308 | } | |
309 | ||
e27b5198 AS |
310 | /* |
311 | * Create a scatter-gather list representing our input buffer and put | |
312 | * it in the queue. | |
313 | * | |
314 | * Callers should take appropriate locks. | |
315 | */ | |
203baab8 | 316 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
317 | { |
318 | struct scatterlist sg[1]; | |
203baab8 | 319 | int ret; |
1c85bf35 | 320 | |
e27b5198 AS |
321 | sg_init_one(sg, buf->buf, buf->size); |
322 | ||
505b0451 MT |
323 | ret = virtqueue_add_buf(vq, sg, 0, 1, buf); |
324 | virtqueue_kick(vq); | |
203baab8 AS |
325 | return ret; |
326 | } | |
327 | ||
88f251ac AS |
328 | /* Discard any unread data this port has. Callers lockers. */ |
329 | static void discard_port_data(struct port *port) | |
330 | { | |
331 | struct port_buffer *buf; | |
332 | struct virtqueue *vq; | |
333 | unsigned int len; | |
d6933561 | 334 | int ret; |
88f251ac AS |
335 | |
336 | vq = port->in_vq; | |
337 | if (port->inbuf) | |
338 | buf = port->inbuf; | |
339 | else | |
505b0451 | 340 | buf = virtqueue_get_buf(vq, &len); |
88f251ac | 341 | |
d6933561 AS |
342 | ret = 0; |
343 | while (buf) { | |
344 | if (add_inbuf(vq, buf) < 0) { | |
345 | ret++; | |
346 | free_buf(buf); | |
347 | } | |
505b0451 | 348 | buf = virtqueue_get_buf(vq, &len); |
88f251ac | 349 | } |
88f251ac | 350 | port->inbuf = NULL; |
d6933561 AS |
351 | if (ret) |
352 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", | |
353 | ret); | |
88f251ac AS |
354 | } |
355 | ||
203baab8 AS |
356 | static bool port_has_data(struct port *port) |
357 | { | |
358 | unsigned long flags; | |
359 | bool ret; | |
360 | ||
203baab8 | 361 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 362 | if (port->inbuf) { |
203baab8 | 363 | ret = true; |
d6933561 AS |
364 | goto out; |
365 | } | |
366 | port->inbuf = get_inbuf(port); | |
367 | if (port->inbuf) { | |
368 | ret = true; | |
369 | goto out; | |
370 | } | |
371 | ret = false; | |
372 | out: | |
203baab8 | 373 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
374 | return ret; |
375 | } | |
376 | ||
3425e706 AS |
377 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
378 | unsigned int event, unsigned int value) | |
17634ba2 AS |
379 | { |
380 | struct scatterlist sg[1]; | |
381 | struct virtio_console_control cpkt; | |
382 | struct virtqueue *vq; | |
604b2ad7 | 383 | unsigned int len; |
17634ba2 | 384 | |
3425e706 | 385 | if (!use_multiport(portdev)) |
17634ba2 AS |
386 | return 0; |
387 | ||
3425e706 | 388 | cpkt.id = port_id; |
17634ba2 AS |
389 | cpkt.event = event; |
390 | cpkt.value = value; | |
391 | ||
3425e706 | 392 | vq = portdev->c_ovq; |
17634ba2 AS |
393 | |
394 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
505b0451 MT |
395 | if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt) >= 0) { |
396 | virtqueue_kick(vq); | |
397 | while (!virtqueue_get_buf(vq, &len)) | |
17634ba2 AS |
398 | cpu_relax(); |
399 | } | |
400 | return 0; | |
401 | } | |
402 | ||
3425e706 AS |
403 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
404 | unsigned int value) | |
405 | { | |
406 | return __send_control_msg(port->portdev, port->id, event, value); | |
407 | } | |
408 | ||
f997f00b AS |
409 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count) |
410 | { | |
411 | struct scatterlist sg[1]; | |
412 | struct virtqueue *out_vq; | |
413 | ssize_t ret; | |
414 | unsigned int len; | |
415 | ||
416 | out_vq = port->out_vq; | |
417 | ||
418 | sg_init_one(sg, in_buf, in_count); | |
505b0451 | 419 | ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf); |
f997f00b AS |
420 | |
421 | /* Tell Host to go! */ | |
505b0451 | 422 | virtqueue_kick(out_vq); |
f997f00b AS |
423 | |
424 | if (ret < 0) { | |
9ff4cfab | 425 | in_count = 0; |
f997f00b AS |
426 | goto fail; |
427 | } | |
428 | ||
9ff4cfab | 429 | /* Wait till the host acknowledges it pushed out the data we sent. */ |
505b0451 | 430 | while (!virtqueue_get_buf(out_vq, &len)) |
f997f00b AS |
431 | cpu_relax(); |
432 | fail: | |
433 | /* We're expected to return the amount of data we wrote */ | |
9ff4cfab | 434 | return in_count; |
f997f00b AS |
435 | } |
436 | ||
203baab8 AS |
437 | /* |
438 | * Give out the data that's requested from the buffer that we have | |
439 | * queued up. | |
440 | */ | |
b766ceed AS |
441 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
442 | bool to_user) | |
203baab8 AS |
443 | { |
444 | struct port_buffer *buf; | |
445 | unsigned long flags; | |
446 | ||
447 | if (!out_count || !port_has_data(port)) | |
448 | return 0; | |
449 | ||
450 | buf = port->inbuf; | |
b766ceed | 451 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 452 | |
b766ceed AS |
453 | if (to_user) { |
454 | ssize_t ret; | |
455 | ||
456 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
457 | if (ret) | |
458 | return -EFAULT; | |
459 | } else { | |
460 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
461 | } | |
203baab8 | 462 | |
203baab8 AS |
463 | buf->offset += out_count; |
464 | ||
465 | if (buf->offset == buf->len) { | |
466 | /* | |
467 | * We're done using all the data in this buffer. | |
468 | * Re-queue so that the Host can send us more data. | |
469 | */ | |
470 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
471 | port->inbuf = NULL; | |
472 | ||
473 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 474 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
475 | |
476 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
477 | } | |
b766ceed | 478 | /* Return the number of bytes actually copied */ |
203baab8 | 479 | return out_count; |
e27b5198 AS |
480 | } |
481 | ||
2030fa49 AS |
482 | /* The condition that must be true for polling to end */ |
483 | static bool wait_is_over(struct port *port) | |
484 | { | |
485 | return port_has_data(port) || !port->host_connected; | |
486 | } | |
487 | ||
488 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, | |
489 | size_t count, loff_t *offp) | |
490 | { | |
491 | struct port *port; | |
492 | ssize_t ret; | |
493 | ||
494 | port = filp->private_data; | |
495 | ||
496 | if (!port_has_data(port)) { | |
497 | /* | |
498 | * If nothing's connected on the host just return 0 in | |
499 | * case of list_empty; this tells the userspace app | |
500 | * that there's no connection | |
501 | */ | |
502 | if (!port->host_connected) | |
503 | return 0; | |
504 | if (filp->f_flags & O_NONBLOCK) | |
505 | return -EAGAIN; | |
506 | ||
507 | ret = wait_event_interruptible(port->waitqueue, | |
508 | wait_is_over(port)); | |
509 | if (ret < 0) | |
510 | return ret; | |
511 | } | |
512 | /* | |
513 | * We could've received a disconnection message while we were | |
514 | * waiting for more data. | |
515 | * | |
516 | * This check is not clubbed in the if() statement above as we | |
517 | * might receive some data as well as the host could get | |
518 | * disconnected after we got woken up from our wait. So we | |
519 | * really want to give off whatever data we have and only then | |
520 | * check for host_connected. | |
521 | */ | |
522 | if (!port_has_data(port) && !port->host_connected) | |
523 | return 0; | |
524 | ||
525 | return fill_readbuf(port, ubuf, count, true); | |
526 | } | |
527 | ||
528 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
529 | size_t count, loff_t *offp) | |
530 | { | |
531 | struct port *port; | |
532 | char *buf; | |
533 | ssize_t ret; | |
534 | ||
535 | port = filp->private_data; | |
536 | ||
537 | count = min((size_t)(32 * 1024), count); | |
538 | ||
539 | buf = kmalloc(count, GFP_KERNEL); | |
540 | if (!buf) | |
541 | return -ENOMEM; | |
542 | ||
543 | ret = copy_from_user(buf, ubuf, count); | |
544 | if (ret) { | |
545 | ret = -EFAULT; | |
546 | goto free_buf; | |
547 | } | |
548 | ||
549 | ret = send_buf(port, buf, count); | |
550 | free_buf: | |
551 | kfree(buf); | |
552 | return ret; | |
553 | } | |
554 | ||
555 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
556 | { | |
557 | struct port *port; | |
558 | unsigned int ret; | |
559 | ||
560 | port = filp->private_data; | |
561 | poll_wait(filp, &port->waitqueue, wait); | |
562 | ||
563 | ret = 0; | |
564 | if (port->inbuf) | |
565 | ret |= POLLIN | POLLRDNORM; | |
566 | if (port->host_connected) | |
567 | ret |= POLLOUT; | |
568 | if (!port->host_connected) | |
569 | ret |= POLLHUP; | |
570 | ||
571 | return ret; | |
572 | } | |
573 | ||
574 | static int port_fops_release(struct inode *inode, struct file *filp) | |
575 | { | |
576 | struct port *port; | |
577 | ||
578 | port = filp->private_data; | |
579 | ||
580 | /* Notify host of port being closed */ | |
581 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
582 | ||
88f251ac | 583 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
584 | port->guest_connected = false; |
585 | ||
88f251ac AS |
586 | discard_port_data(port); |
587 | ||
588 | spin_unlock_irq(&port->inbuf_lock); | |
589 | ||
2030fa49 AS |
590 | return 0; |
591 | } | |
592 | ||
593 | static int port_fops_open(struct inode *inode, struct file *filp) | |
594 | { | |
595 | struct cdev *cdev = inode->i_cdev; | |
596 | struct port *port; | |
597 | ||
598 | port = container_of(cdev, struct port, cdev); | |
599 | filp->private_data = port; | |
600 | ||
601 | /* | |
602 | * Don't allow opening of console port devices -- that's done | |
603 | * via /dev/hvc | |
604 | */ | |
605 | if (is_console_port(port)) | |
606 | return -ENXIO; | |
607 | ||
3c7969cc AS |
608 | /* Allow only one process to open a particular port at a time */ |
609 | spin_lock_irq(&port->inbuf_lock); | |
610 | if (port->guest_connected) { | |
611 | spin_unlock_irq(&port->inbuf_lock); | |
612 | return -EMFILE; | |
613 | } | |
614 | ||
615 | port->guest_connected = true; | |
616 | spin_unlock_irq(&port->inbuf_lock); | |
617 | ||
2030fa49 AS |
618 | /* Notify host of port being opened */ |
619 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
624 | /* | |
625 | * The file operations that we support: programs in the guest can open | |
626 | * a console device, read from it, write to it, poll for data and | |
627 | * close it. The devices are at | |
628 | * /dev/vport<device number>p<port number> | |
629 | */ | |
630 | static const struct file_operations port_fops = { | |
631 | .owner = THIS_MODULE, | |
632 | .open = port_fops_open, | |
633 | .read = port_fops_read, | |
634 | .write = port_fops_write, | |
635 | .poll = port_fops_poll, | |
636 | .release = port_fops_release, | |
637 | }; | |
638 | ||
a23ea924 RR |
639 | /* |
640 | * The put_chars() callback is pretty straightforward. | |
31610434 | 641 | * |
a23ea924 RR |
642 | * We turn the characters into a scatter-gather list, add it to the |
643 | * output queue and then kick the Host. Then we sit here waiting for | |
644 | * it to finish: inefficient in theory, but in practice | |
645 | * implementations will do it immediately (lguest's Launcher does). | |
646 | */ | |
31610434 RR |
647 | static int put_chars(u32 vtermno, const char *buf, int count) |
648 | { | |
21206ede | 649 | struct port *port; |
38edf58d | 650 | |
162a689a FD |
651 | if (unlikely(early_put_chars)) |
652 | return early_put_chars(vtermno, buf, count); | |
653 | ||
38edf58d AS |
654 | port = find_port_by_vtermno(vtermno); |
655 | if (!port) | |
656 | return 0; | |
31610434 | 657 | |
f997f00b | 658 | return send_buf(port, (void *)buf, count); |
31610434 RR |
659 | } |
660 | ||
a23ea924 RR |
661 | /* |
662 | * get_chars() is the callback from the hvc_console infrastructure | |
663 | * when an interrupt is received. | |
31610434 | 664 | * |
203baab8 AS |
665 | * We call out to fill_readbuf that gets us the required data from the |
666 | * buffers that are queued up. | |
a23ea924 | 667 | */ |
31610434 RR |
668 | static int get_chars(u32 vtermno, char *buf, int count) |
669 | { | |
21206ede RR |
670 | struct port *port; |
671 | ||
38edf58d AS |
672 | port = find_port_by_vtermno(vtermno); |
673 | if (!port) | |
674 | return 0; | |
21206ede | 675 | |
31610434 | 676 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 677 | BUG_ON(!port->in_vq); |
31610434 | 678 | |
b766ceed | 679 | return fill_readbuf(port, buf, count, false); |
31610434 | 680 | } |
31610434 | 681 | |
cb06e367 | 682 | static void resize_console(struct port *port) |
c2983458 | 683 | { |
cb06e367 | 684 | struct virtio_device *vdev; |
c2983458 CB |
685 | struct winsize ws; |
686 | ||
2de16a49 AS |
687 | /* The port could have been hot-unplugged */ |
688 | if (!port) | |
689 | return; | |
690 | ||
cb06e367 AS |
691 | vdev = port->portdev->vdev; |
692 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) { | |
693 | vdev->config->get(vdev, | |
694 | offsetof(struct virtio_console_config, cols), | |
695 | &ws.ws_col, sizeof(u16)); | |
696 | vdev->config->get(vdev, | |
697 | offsetof(struct virtio_console_config, rows), | |
698 | &ws.ws_row, sizeof(u16)); | |
4f23c573 | 699 | hvc_resize(port->cons.hvc, ws); |
c2983458 CB |
700 | } |
701 | } | |
702 | ||
38edf58d | 703 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
704 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
705 | { | |
38edf58d AS |
706 | struct port *port; |
707 | ||
708 | port = find_port_by_vtermno(hp->vtermno); | |
709 | if (!port) | |
710 | return -EINVAL; | |
711 | ||
91fcad19 | 712 | hp->irq_requested = 1; |
cb06e367 | 713 | resize_console(port); |
c2983458 | 714 | |
91fcad19 CB |
715 | return 0; |
716 | } | |
717 | ||
718 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
719 | { | |
720 | hp->irq_requested = 0; | |
721 | } | |
722 | ||
17634ba2 | 723 | /* The operations for console ports. */ |
1dff3996 | 724 | static const struct hv_ops hv_ops = { |
971f3390 RR |
725 | .get_chars = get_chars, |
726 | .put_chars = put_chars, | |
727 | .notifier_add = notifier_add_vio, | |
728 | .notifier_del = notifier_del_vio, | |
729 | .notifier_hangup = notifier_del_vio, | |
730 | }; | |
731 | ||
732 | /* | |
733 | * Console drivers are initialized very early so boot messages can go | |
734 | * out, so we do things slightly differently from the generic virtio | |
735 | * initialization of the net and block drivers. | |
736 | * | |
737 | * At this stage, the console is output-only. It's too early to set | |
738 | * up a virtqueue, so we let the drivers do some boutique early-output | |
739 | * thing. | |
740 | */ | |
741 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
742 | { | |
743 | early_put_chars = put_chars; | |
744 | return hvc_instantiate(0, 0, &hv_ops); | |
745 | } | |
746 | ||
17634ba2 | 747 | int init_port_console(struct port *port) |
cfa6d379 AS |
748 | { |
749 | int ret; | |
750 | ||
751 | /* | |
752 | * The Host's telling us this port is a console port. Hook it | |
753 | * up with an hvc console. | |
754 | * | |
755 | * To set up and manage our virtual console, we call | |
756 | * hvc_alloc(). | |
757 | * | |
758 | * The first argument of hvc_alloc() is the virtual console | |
759 | * number. The second argument is the parameter for the | |
760 | * notification mechanism (like irq number). We currently | |
761 | * leave this as zero, virtqueues have implicit notifications. | |
762 | * | |
763 | * The third argument is a "struct hv_ops" containing the | |
764 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
765 | * pointers. The final argument is the output buffer size: we | |
766 | * can do any size, so we put PAGE_SIZE here. | |
767 | */ | |
768 | port->cons.vtermno = pdrvdata.next_vtermno; | |
769 | ||
770 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
771 | if (IS_ERR(port->cons.hvc)) { | |
772 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
773 | dev_err(port->dev, |
774 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
775 | port->cons.hvc = NULL; |
776 | return ret; | |
777 | } | |
778 | spin_lock_irq(&pdrvdata_lock); | |
779 | pdrvdata.next_vtermno++; | |
780 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
781 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 782 | port->guest_connected = true; |
cfa6d379 | 783 | |
2030fa49 AS |
784 | /* Notify host of port being opened */ |
785 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
786 | ||
cfa6d379 AS |
787 | return 0; |
788 | } | |
789 | ||
431edb8a AS |
790 | static ssize_t show_port_name(struct device *dev, |
791 | struct device_attribute *attr, char *buffer) | |
792 | { | |
793 | struct port *port; | |
794 | ||
795 | port = dev_get_drvdata(dev); | |
796 | ||
797 | return sprintf(buffer, "%s\n", port->name); | |
798 | } | |
799 | ||
800 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
801 | ||
802 | static struct attribute *port_sysfs_entries[] = { | |
803 | &dev_attr_name.attr, | |
804 | NULL | |
805 | }; | |
806 | ||
807 | static struct attribute_group port_attribute_group = { | |
808 | .name = NULL, /* put in device directory */ | |
809 | .attrs = port_sysfs_entries, | |
810 | }; | |
811 | ||
d99393ef AS |
812 | static int debugfs_open(struct inode *inode, struct file *filp) |
813 | { | |
814 | filp->private_data = inode->i_private; | |
815 | return 0; | |
816 | } | |
817 | ||
818 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, | |
819 | size_t count, loff_t *offp) | |
820 | { | |
821 | struct port *port; | |
822 | char *buf; | |
823 | ssize_t ret, out_offset, out_count; | |
824 | ||
825 | out_count = 1024; | |
826 | buf = kmalloc(out_count, GFP_KERNEL); | |
827 | if (!buf) | |
828 | return -ENOMEM; | |
829 | ||
830 | port = filp->private_data; | |
831 | out_offset = 0; | |
832 | out_offset += snprintf(buf + out_offset, out_count, | |
833 | "name: %s\n", port->name ? port->name : ""); | |
834 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
835 | "guest_connected: %d\n", port->guest_connected); | |
836 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
837 | "host_connected: %d\n", port->host_connected); | |
838 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
839 | "is_console: %s\n", | |
840 | is_console_port(port) ? "yes" : "no"); | |
841 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
842 | "console_vtermno: %u\n", port->cons.vtermno); | |
843 | ||
844 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
845 | kfree(buf); | |
846 | return ret; | |
847 | } | |
848 | ||
849 | static const struct file_operations port_debugfs_ops = { | |
850 | .owner = THIS_MODULE, | |
851 | .open = debugfs_open, | |
852 | .read = debugfs_read, | |
853 | }; | |
854 | ||
1f7aa42d AS |
855 | /* Remove all port-specific data. */ |
856 | static int remove_port(struct port *port) | |
857 | { | |
a9cdd485 AS |
858 | struct port_buffer *buf; |
859 | ||
1f7aa42d AS |
860 | spin_lock_irq(&port->portdev->ports_lock); |
861 | list_del(&port->list); | |
862 | spin_unlock_irq(&port->portdev->ports_lock); | |
863 | ||
864 | if (is_console_port(port)) { | |
865 | spin_lock_irq(&pdrvdata_lock); | |
866 | list_del(&port->cons.list); | |
867 | spin_unlock_irq(&pdrvdata_lock); | |
868 | hvc_remove(port->cons.hvc); | |
869 | } | |
870 | if (port->guest_connected) | |
871 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
872 | ||
1f7aa42d AS |
873 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); |
874 | device_destroy(pdrvdata.class, port->dev->devt); | |
875 | cdev_del(&port->cdev); | |
876 | ||
a9cdd485 | 877 | /* Remove unused data this port might have received. */ |
1f7aa42d | 878 | discard_port_data(port); |
a9cdd485 AS |
879 | |
880 | /* Remove buffers we queued up for the Host to send us data in. */ | |
505b0451 | 881 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) |
a9cdd485 AS |
882 | free_buf(buf); |
883 | ||
1f7aa42d AS |
884 | kfree(port->name); |
885 | ||
d99393ef AS |
886 | debugfs_remove(port->debugfs_file); |
887 | ||
1f7aa42d AS |
888 | kfree(port); |
889 | return 0; | |
890 | } | |
891 | ||
17634ba2 AS |
892 | /* Any private messages that the Host and Guest want to share */ |
893 | static void handle_control_message(struct ports_device *portdev, | |
894 | struct port_buffer *buf) | |
895 | { | |
896 | struct virtio_console_control *cpkt; | |
897 | struct port *port; | |
431edb8a AS |
898 | size_t name_size; |
899 | int err; | |
17634ba2 AS |
900 | |
901 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
902 | ||
903 | port = find_port_by_id(portdev, cpkt->id); | |
904 | if (!port) { | |
905 | /* No valid header at start of buffer. Drop it. */ | |
906 | dev_dbg(&portdev->vdev->dev, | |
907 | "Invalid index %u in control packet\n", cpkt->id); | |
908 | return; | |
909 | } | |
910 | ||
911 | switch (cpkt->event) { | |
912 | case VIRTIO_CONSOLE_CONSOLE_PORT: | |
913 | if (!cpkt->value) | |
914 | break; | |
915 | if (is_console_port(port)) | |
916 | break; | |
917 | ||
918 | init_port_console(port); | |
919 | /* | |
920 | * Could remove the port here in case init fails - but | |
921 | * have to notify the host first. | |
922 | */ | |
923 | break; | |
924 | case VIRTIO_CONSOLE_RESIZE: | |
925 | if (!is_console_port(port)) | |
926 | break; | |
927 | port->cons.hvc->irq_requested = 1; | |
928 | resize_console(port); | |
929 | break; | |
2030fa49 AS |
930 | case VIRTIO_CONSOLE_PORT_OPEN: |
931 | port->host_connected = cpkt->value; | |
932 | wake_up_interruptible(&port->waitqueue); | |
933 | break; | |
431edb8a AS |
934 | case VIRTIO_CONSOLE_PORT_NAME: |
935 | /* | |
936 | * Skip the size of the header and the cpkt to get the size | |
937 | * of the name that was sent | |
938 | */ | |
939 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
940 | ||
941 | port->name = kmalloc(name_size, GFP_KERNEL); | |
942 | if (!port->name) { | |
943 | dev_err(port->dev, | |
944 | "Not enough space to store port name\n"); | |
945 | break; | |
946 | } | |
947 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
948 | name_size - 1); | |
949 | port->name[name_size - 1] = 0; | |
950 | ||
951 | /* | |
952 | * Since we only have one sysfs attribute, 'name', | |
953 | * create it only if we have a name for the port. | |
954 | */ | |
955 | err = sysfs_create_group(&port->dev->kobj, | |
956 | &port_attribute_group); | |
ec64213c | 957 | if (err) { |
431edb8a AS |
958 | dev_err(port->dev, |
959 | "Error %d creating sysfs device attributes\n", | |
960 | err); | |
ec64213c AS |
961 | } else { |
962 | /* | |
963 | * Generate a udev event so that appropriate | |
964 | * symlinks can be created based on udev | |
965 | * rules. | |
966 | */ | |
967 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
968 | } | |
431edb8a | 969 | break; |
1f7aa42d AS |
970 | case VIRTIO_CONSOLE_PORT_REMOVE: |
971 | /* | |
972 | * Hot unplug the port. We don't decrement nr_ports | |
973 | * since we don't want to deal with extra complexities | |
974 | * of using the lowest-available port id: We can just | |
975 | * pick up the nr_ports number as the id and not have | |
976 | * userspace send it to us. This helps us in two | |
977 | * ways: | |
978 | * | |
979 | * - We don't need to have a 'port_id' field in the | |
980 | * config space when a port is hot-added. This is a | |
981 | * good thing as we might queue up multiple hotplug | |
982 | * requests issued in our workqueue. | |
983 | * | |
984 | * - Another way to deal with this would have been to | |
985 | * use a bitmap of the active ports and select the | |
986 | * lowest non-active port from that map. That | |
987 | * bloats the already tight config space and we | |
988 | * would end up artificially limiting the | |
989 | * max. number of ports to sizeof(bitmap). Right | |
990 | * now we can support 2^32 ports (as the port id is | |
991 | * stored in a u32 type). | |
992 | * | |
993 | */ | |
994 | remove_port(port); | |
995 | break; | |
17634ba2 AS |
996 | } |
997 | } | |
998 | ||
999 | static void control_work_handler(struct work_struct *work) | |
1000 | { | |
1001 | struct ports_device *portdev; | |
1002 | struct virtqueue *vq; | |
1003 | struct port_buffer *buf; | |
1004 | unsigned int len; | |
1005 | ||
1006 | portdev = container_of(work, struct ports_device, control_work); | |
1007 | vq = portdev->c_ivq; | |
1008 | ||
1009 | spin_lock(&portdev->cvq_lock); | |
505b0451 | 1010 | while ((buf = virtqueue_get_buf(vq, &len))) { |
17634ba2 AS |
1011 | spin_unlock(&portdev->cvq_lock); |
1012 | ||
1013 | buf->len = len; | |
1014 | buf->offset = 0; | |
1015 | ||
1016 | handle_control_message(portdev, buf); | |
1017 | ||
1018 | spin_lock(&portdev->cvq_lock); | |
1019 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
1020 | dev_warn(&portdev->vdev->dev, | |
1021 | "Error adding buffer to queue\n"); | |
1022 | free_buf(buf); | |
1023 | } | |
1024 | } | |
1025 | spin_unlock(&portdev->cvq_lock); | |
1026 | } | |
1027 | ||
1028 | static void in_intr(struct virtqueue *vq) | |
1029 | { | |
1030 | struct port *port; | |
1031 | unsigned long flags; | |
1032 | ||
1033 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1034 | if (!port) | |
1035 | return; | |
1036 | ||
1037 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d6933561 AS |
1038 | if (!port->inbuf) |
1039 | port->inbuf = get_inbuf(port); | |
17634ba2 | 1040 | |
88f251ac AS |
1041 | /* |
1042 | * Don't queue up data when port is closed. This condition | |
1043 | * can be reached when a console port is not yet connected (no | |
1044 | * tty is spawned) and the host sends out data to console | |
1045 | * ports. For generic serial ports, the host won't | |
1046 | * (shouldn't) send data till the guest is connected. | |
1047 | */ | |
1048 | if (!port->guest_connected) | |
1049 | discard_port_data(port); | |
1050 | ||
17634ba2 AS |
1051 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1052 | ||
2030fa49 AS |
1053 | wake_up_interruptible(&port->waitqueue); |
1054 | ||
17634ba2 AS |
1055 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1056 | hvc_kick(); | |
1057 | } | |
1058 | ||
1059 | static void control_intr(struct virtqueue *vq) | |
1060 | { | |
1061 | struct ports_device *portdev; | |
1062 | ||
1063 | portdev = vq->vdev->priv; | |
1064 | schedule_work(&portdev->control_work); | |
1065 | } | |
1066 | ||
7f5d810d AS |
1067 | static void config_intr(struct virtio_device *vdev) |
1068 | { | |
1069 | struct ports_device *portdev; | |
1070 | ||
1071 | portdev = vdev->priv; | |
1072 | if (use_multiport(portdev)) { | |
1073 | /* Handle port hot-add */ | |
1074 | schedule_work(&portdev->config_work); | |
1075 | } | |
1076 | /* | |
1077 | * We'll use this way of resizing only for legacy support. | |
1078 | * For newer userspace (VIRTIO_CONSOLE_F_MULTPORT+), use | |
1079 | * control messages to indicate console size changes so that | |
1080 | * it can be done per-port | |
1081 | */ | |
1082 | resize_console(find_port_by_id(portdev, 0)); | |
1083 | } | |
1084 | ||
22a29eac | 1085 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
17634ba2 AS |
1086 | { |
1087 | struct port_buffer *buf; | |
335a64a5 AS |
1088 | unsigned int nr_added_bufs; |
1089 | int ret; | |
17634ba2 | 1090 | |
335a64a5 | 1091 | nr_added_bufs = 0; |
17634ba2 AS |
1092 | do { |
1093 | buf = alloc_buf(PAGE_SIZE); | |
1094 | if (!buf) | |
1095 | break; | |
1096 | ||
1097 | spin_lock_irq(lock); | |
335a64a5 AS |
1098 | ret = add_inbuf(vq, buf); |
1099 | if (ret < 0) { | |
17634ba2 AS |
1100 | spin_unlock_irq(lock); |
1101 | free_buf(buf); | |
1102 | break; | |
1103 | } | |
335a64a5 | 1104 | nr_added_bufs++; |
17634ba2 | 1105 | spin_unlock_irq(lock); |
335a64a5 | 1106 | } while (ret > 0); |
22a29eac | 1107 | |
335a64a5 | 1108 | return nr_added_bufs; |
17634ba2 AS |
1109 | } |
1110 | ||
1111 | static int add_port(struct ports_device *portdev, u32 id) | |
d8a02bd5 | 1112 | { |
d99393ef | 1113 | char debugfs_name[16]; |
21206ede | 1114 | struct port *port; |
d6933561 | 1115 | struct port_buffer *buf; |
fb08bd27 | 1116 | dev_t devt; |
335a64a5 | 1117 | unsigned int nr_added_bufs; |
31610434 | 1118 | int err; |
31610434 | 1119 | |
1c85bf35 | 1120 | port = kmalloc(sizeof(*port), GFP_KERNEL); |
d8a02bd5 RR |
1121 | if (!port) { |
1122 | err = -ENOMEM; | |
1123 | goto fail; | |
f550804a | 1124 | } |
73954488 | 1125 | |
1c85bf35 | 1126 | port->portdev = portdev; |
17634ba2 | 1127 | port->id = id; |
203baab8 | 1128 | |
431edb8a | 1129 | port->name = NULL; |
203baab8 | 1130 | port->inbuf = NULL; |
17634ba2 | 1131 | port->cons.hvc = NULL; |
203baab8 | 1132 | |
3c7969cc | 1133 | port->host_connected = port->guest_connected = false; |
2030fa49 | 1134 | |
17634ba2 AS |
1135 | port->in_vq = portdev->in_vqs[port->id]; |
1136 | port->out_vq = portdev->out_vqs[port->id]; | |
31610434 | 1137 | |
2030fa49 | 1138 | cdev_init(&port->cdev, &port_fops); |
fb08bd27 AS |
1139 | |
1140 | devt = MKDEV(portdev->chr_major, id); | |
1141 | err = cdev_add(&port->cdev, devt, 1); | |
1142 | if (err < 0) { | |
1143 | dev_err(&port->portdev->vdev->dev, | |
1144 | "Error %d adding cdev for port %u\n", err, id); | |
1145 | goto free_port; | |
1146 | } | |
1147 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1148 | devt, port, "vport%up%u", | |
1149 | port->portdev->drv_index, id); | |
1150 | if (IS_ERR(port->dev)) { | |
1151 | err = PTR_ERR(port->dev); | |
1152 | dev_err(&port->portdev->vdev->dev, | |
1153 | "Error %d creating device for port %u\n", | |
1154 | err, id); | |
1155 | goto free_cdev; | |
1156 | } | |
1157 | ||
203baab8 | 1158 | spin_lock_init(&port->inbuf_lock); |
2030fa49 | 1159 | init_waitqueue_head(&port->waitqueue); |
203baab8 | 1160 | |
d6933561 | 1161 | /* Fill the in_vq with buffers so the host can send us data. */ |
335a64a5 AS |
1162 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); |
1163 | if (!nr_added_bufs) { | |
d6933561 | 1164 | dev_err(port->dev, "Error allocating inbufs\n"); |
1c85bf35 | 1165 | err = -ENOMEM; |
fb08bd27 | 1166 | goto free_device; |
1c85bf35 | 1167 | } |
31610434 | 1168 | |
17634ba2 AS |
1169 | /* |
1170 | * If we're not using multiport support, this has to be a console port | |
1171 | */ | |
1172 | if (!use_multiport(port->portdev)) { | |
1173 | err = init_port_console(port); | |
1174 | if (err) | |
d6933561 | 1175 | goto free_inbufs; |
17634ba2 AS |
1176 | } |
1177 | ||
1178 | spin_lock_irq(&portdev->ports_lock); | |
1179 | list_add_tail(&port->list, &port->portdev->ports); | |
1180 | spin_unlock_irq(&portdev->ports_lock); | |
1181 | ||
1182 | /* | |
1183 | * Tell the Host we're set so that it can send us various | |
1184 | * configuration parameters for this port (eg, port name, | |
1185 | * caching, whether this is a console port, etc.) | |
1186 | */ | |
1187 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
38edf58d | 1188 | |
d99393ef AS |
1189 | if (pdrvdata.debugfs_dir) { |
1190 | /* | |
1191 | * Finally, create the debugfs file that we can use to | |
1192 | * inspect a port's state at any time | |
1193 | */ | |
1194 | sprintf(debugfs_name, "vport%up%u", | |
1195 | port->portdev->drv_index, id); | |
1196 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, | |
1197 | pdrvdata.debugfs_dir, | |
1198 | port, | |
1199 | &port_debugfs_ops); | |
1200 | } | |
1c85bf35 AS |
1201 | return 0; |
1202 | ||
d6933561 | 1203 | free_inbufs: |
505b0451 | 1204 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) |
d6933561 | 1205 | free_buf(buf); |
fb08bd27 AS |
1206 | free_device: |
1207 | device_destroy(pdrvdata.class, port->dev->devt); | |
1208 | free_cdev: | |
1209 | cdev_del(&port->cdev); | |
1c85bf35 AS |
1210 | free_port: |
1211 | kfree(port); | |
1212 | fail: | |
1213 | return err; | |
1214 | } | |
1215 | ||
7f5d810d AS |
1216 | /* |
1217 | * The workhandler for config-space updates. | |
1218 | * | |
1219 | * This is called when ports are hot-added. | |
1220 | */ | |
1221 | static void config_work_handler(struct work_struct *work) | |
1222 | { | |
b99fa815 | 1223 | struct virtio_console_config virtconconf; |
7f5d810d AS |
1224 | struct ports_device *portdev; |
1225 | struct virtio_device *vdev; | |
1226 | int err; | |
1227 | ||
1228 | portdev = container_of(work, struct ports_device, config_work); | |
1229 | ||
1230 | vdev = portdev->vdev; | |
1231 | vdev->config->get(vdev, | |
b99fa815 | 1232 | offsetof(struct virtio_console_config, nr_ports), |
7f5d810d AS |
1233 | &virtconconf.nr_ports, |
1234 | sizeof(virtconconf.nr_ports)); | |
1235 | ||
1236 | if (portdev->config.nr_ports == virtconconf.nr_ports) { | |
1237 | /* | |
1238 | * Port 0 got hot-added. Since we already did all the | |
1239 | * other initialisation for it, just tell the Host | |
1f7aa42d AS |
1240 | * that the port is ready if we find the port. In |
1241 | * case the port was hot-removed earlier, we call | |
1242 | * add_port to add the port. | |
7f5d810d AS |
1243 | */ |
1244 | struct port *port; | |
1245 | ||
1246 | port = find_port_by_id(portdev, 0); | |
1f7aa42d AS |
1247 | if (!port) |
1248 | add_port(portdev, 0); | |
1249 | else | |
1250 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
7f5d810d AS |
1251 | return; |
1252 | } | |
1253 | if (virtconconf.nr_ports > portdev->config.max_nr_ports) { | |
1254 | dev_warn(&vdev->dev, | |
1255 | "More ports specified (%u) than allowed (%u)", | |
1256 | portdev->config.nr_ports + 1, | |
1257 | portdev->config.max_nr_ports); | |
1258 | return; | |
1259 | } | |
1260 | if (virtconconf.nr_ports < portdev->config.nr_ports) | |
1261 | return; | |
1262 | ||
1263 | /* Hot-add ports */ | |
1264 | while (virtconconf.nr_ports - portdev->config.nr_ports) { | |
1265 | err = add_port(portdev, portdev->config.nr_ports); | |
1266 | if (err) | |
1267 | break; | |
1268 | portdev->config.nr_ports++; | |
1269 | } | |
1270 | } | |
1271 | ||
2658a79a AS |
1272 | static int init_vqs(struct ports_device *portdev) |
1273 | { | |
1274 | vq_callback_t **io_callbacks; | |
1275 | char **io_names; | |
1276 | struct virtqueue **vqs; | |
17634ba2 | 1277 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1278 | int err; |
1279 | ||
17634ba2 AS |
1280 | nr_ports = portdev->config.max_nr_ports; |
1281 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1282 | |
1283 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
1284 | if (!vqs) { | |
1285 | err = -ENOMEM; | |
1286 | goto fail; | |
1287 | } | |
1288 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); | |
1289 | if (!io_callbacks) { | |
1290 | err = -ENOMEM; | |
1291 | goto free_vqs; | |
1292 | } | |
1293 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); | |
1294 | if (!io_names) { | |
1295 | err = -ENOMEM; | |
1296 | goto free_callbacks; | |
1297 | } | |
1298 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1299 | GFP_KERNEL); | |
1300 | if (!portdev->in_vqs) { | |
1301 | err = -ENOMEM; | |
1302 | goto free_names; | |
1303 | } | |
1304 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1305 | GFP_KERNEL); | |
1306 | if (!portdev->out_vqs) { | |
1307 | err = -ENOMEM; | |
1308 | goto free_invqs; | |
1309 | } | |
1310 | ||
17634ba2 AS |
1311 | /* |
1312 | * For backward compat (newer host but older guest), the host | |
1313 | * spawns a console port first and also inits the vqs for port | |
1314 | * 0 before others. | |
1315 | */ | |
1316 | j = 0; | |
1317 | io_callbacks[j] = in_intr; | |
1318 | io_callbacks[j + 1] = NULL; | |
1319 | io_names[j] = "input"; | |
1320 | io_names[j + 1] = "output"; | |
1321 | j += 2; | |
1322 | ||
1323 | if (use_multiport(portdev)) { | |
1324 | io_callbacks[j] = control_intr; | |
1325 | io_callbacks[j + 1] = NULL; | |
1326 | io_names[j] = "control-i"; | |
1327 | io_names[j + 1] = "control-o"; | |
1328 | ||
1329 | for (i = 1; i < nr_ports; i++) { | |
1330 | j += 2; | |
1331 | io_callbacks[j] = in_intr; | |
1332 | io_callbacks[j + 1] = NULL; | |
1333 | io_names[j] = "input"; | |
1334 | io_names[j + 1] = "output"; | |
1335 | } | |
1336 | } | |
2658a79a AS |
1337 | /* Find the queues. */ |
1338 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1339 | io_callbacks, | |
1340 | (const char **)io_names); | |
1341 | if (err) | |
1342 | goto free_outvqs; | |
1343 | ||
17634ba2 | 1344 | j = 0; |
2658a79a AS |
1345 | portdev->in_vqs[0] = vqs[0]; |
1346 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1347 | j += 2; |
1348 | if (use_multiport(portdev)) { | |
1349 | portdev->c_ivq = vqs[j]; | |
1350 | portdev->c_ovq = vqs[j + 1]; | |
1351 | ||
1352 | for (i = 1; i < nr_ports; i++) { | |
1353 | j += 2; | |
1354 | portdev->in_vqs[i] = vqs[j]; | |
1355 | portdev->out_vqs[i] = vqs[j + 1]; | |
1356 | } | |
1357 | } | |
2658a79a AS |
1358 | kfree(io_callbacks); |
1359 | kfree(io_names); | |
1360 | kfree(vqs); | |
1361 | ||
1362 | return 0; | |
1363 | ||
1364 | free_names: | |
1365 | kfree(io_names); | |
1366 | free_callbacks: | |
1367 | kfree(io_callbacks); | |
1368 | free_outvqs: | |
1369 | kfree(portdev->out_vqs); | |
1370 | free_invqs: | |
1371 | kfree(portdev->in_vqs); | |
1372 | free_vqs: | |
1373 | kfree(vqs); | |
1374 | fail: | |
1375 | return err; | |
1376 | } | |
1377 | ||
fb08bd27 AS |
1378 | static const struct file_operations portdev_fops = { |
1379 | .owner = THIS_MODULE, | |
1380 | }; | |
1381 | ||
1c85bf35 AS |
1382 | /* |
1383 | * Once we're further in boot, we get probed like any other virtio | |
1384 | * device. | |
17634ba2 AS |
1385 | * |
1386 | * If the host also supports multiple console ports, we check the | |
1387 | * config space to see how many ports the host has spawned. We | |
1388 | * initialize each port found. | |
1c85bf35 AS |
1389 | */ |
1390 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1391 | { | |
1c85bf35 | 1392 | struct ports_device *portdev; |
17634ba2 | 1393 | u32 i; |
1c85bf35 | 1394 | int err; |
17634ba2 | 1395 | bool multiport; |
1c85bf35 AS |
1396 | |
1397 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1398 | if (!portdev) { | |
1399 | err = -ENOMEM; | |
1400 | goto fail; | |
1401 | } | |
1402 | ||
1403 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1404 | portdev->vdev = vdev; | |
1405 | vdev->priv = portdev; | |
1406 | ||
fb08bd27 AS |
1407 | spin_lock_irq(&pdrvdata_lock); |
1408 | portdev->drv_index = pdrvdata.index++; | |
1409 | spin_unlock_irq(&pdrvdata_lock); | |
1410 | ||
1411 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1412 | &portdev_fops); | |
1413 | if (portdev->chr_major < 0) { | |
1414 | dev_err(&vdev->dev, | |
1415 | "Error %d registering chrdev for device %u\n", | |
1416 | portdev->chr_major, portdev->drv_index); | |
1417 | err = portdev->chr_major; | |
1418 | goto free; | |
1419 | } | |
1420 | ||
17634ba2 AS |
1421 | multiport = false; |
1422 | portdev->config.nr_ports = 1; | |
1423 | portdev->config.max_nr_ports = 1; | |
1424 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { | |
1425 | multiport = true; | |
1426 | vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; | |
1427 | ||
b99fa815 AS |
1428 | vdev->config->get(vdev, offsetof(struct virtio_console_config, |
1429 | nr_ports), | |
17634ba2 AS |
1430 | &portdev->config.nr_ports, |
1431 | sizeof(portdev->config.nr_ports)); | |
b99fa815 AS |
1432 | vdev->config->get(vdev, offsetof(struct virtio_console_config, |
1433 | max_nr_ports), | |
17634ba2 AS |
1434 | &portdev->config.max_nr_ports, |
1435 | sizeof(portdev->config.max_nr_ports)); | |
1436 | if (portdev->config.nr_ports > portdev->config.max_nr_ports) { | |
1437 | dev_warn(&vdev->dev, | |
1438 | "More ports (%u) specified than allowed (%u). Will init %u ports.", | |
1439 | portdev->config.nr_ports, | |
1440 | portdev->config.max_nr_ports, | |
1441 | portdev->config.max_nr_ports); | |
1442 | ||
1443 | portdev->config.nr_ports = portdev->config.max_nr_ports; | |
1444 | } | |
1445 | } | |
1446 | ||
1447 | /* Let the Host know we support multiple ports.*/ | |
1448 | vdev->config->finalize_features(vdev); | |
1449 | ||
2658a79a AS |
1450 | err = init_vqs(portdev); |
1451 | if (err < 0) { | |
1452 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1453 | goto free_chrdev; |
2658a79a | 1454 | } |
1c85bf35 | 1455 | |
17634ba2 AS |
1456 | spin_lock_init(&portdev->ports_lock); |
1457 | INIT_LIST_HEAD(&portdev->ports); | |
1458 | ||
1459 | if (multiport) { | |
335a64a5 AS |
1460 | unsigned int nr_added_bufs; |
1461 | ||
17634ba2 AS |
1462 | spin_lock_init(&portdev->cvq_lock); |
1463 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
7f5d810d | 1464 | INIT_WORK(&portdev->config_work, &config_work_handler); |
17634ba2 | 1465 | |
335a64a5 AS |
1466 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
1467 | if (!nr_added_bufs) { | |
22a29eac AS |
1468 | dev_err(&vdev->dev, |
1469 | "Error allocating buffers for control queue\n"); | |
1470 | err = -ENOMEM; | |
1471 | goto free_vqs; | |
1472 | } | |
17634ba2 AS |
1473 | } |
1474 | ||
1475 | for (i = 0; i < portdev->config.nr_ports; i++) | |
1476 | add_port(portdev, i); | |
1c85bf35 | 1477 | |
971f3390 RR |
1478 | /* Start using the new console output. */ |
1479 | early_put_chars = NULL; | |
31610434 RR |
1480 | return 0; |
1481 | ||
22a29eac AS |
1482 | free_vqs: |
1483 | vdev->config->del_vqs(vdev); | |
1484 | kfree(portdev->in_vqs); | |
1485 | kfree(portdev->out_vqs); | |
fb08bd27 AS |
1486 | free_chrdev: |
1487 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1488 | free: |
1c85bf35 | 1489 | kfree(portdev); |
31610434 RR |
1490 | fail: |
1491 | return err; | |
1492 | } | |
1493 | ||
7177876f AS |
1494 | static void virtcons_remove(struct virtio_device *vdev) |
1495 | { | |
1496 | struct ports_device *portdev; | |
1497 | struct port *port, *port2; | |
1498 | struct port_buffer *buf; | |
1499 | unsigned int len; | |
1500 | ||
1501 | portdev = vdev->priv; | |
1502 | ||
1503 | cancel_work_sync(&portdev->control_work); | |
1504 | cancel_work_sync(&portdev->config_work); | |
1505 | ||
1506 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
1507 | remove_port(port); | |
1508 | ||
1509 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
1510 | ||
505b0451 | 1511 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) |
7177876f AS |
1512 | free_buf(buf); |
1513 | ||
505b0451 | 1514 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) |
7177876f AS |
1515 | free_buf(buf); |
1516 | ||
1517 | vdev->config->del_vqs(vdev); | |
1518 | kfree(portdev->in_vqs); | |
1519 | kfree(portdev->out_vqs); | |
1520 | ||
1521 | kfree(portdev); | |
1522 | } | |
1523 | ||
31610434 RR |
1524 | static struct virtio_device_id id_table[] = { |
1525 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1526 | { 0 }, | |
1527 | }; | |
1528 | ||
c2983458 CB |
1529 | static unsigned int features[] = { |
1530 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 1531 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1532 | }; |
1533 | ||
31610434 | 1534 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1535 | .feature_table = features, |
1536 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1537 | .driver.name = KBUILD_MODNAME, |
1538 | .driver.owner = THIS_MODULE, | |
1539 | .id_table = id_table, | |
1540 | .probe = virtcons_probe, | |
7177876f | 1541 | .remove = virtcons_remove, |
7f5d810d | 1542 | .config_changed = config_intr, |
31610434 RR |
1543 | }; |
1544 | ||
1545 | static int __init init(void) | |
1546 | { | |
fb08bd27 AS |
1547 | int err; |
1548 | ||
1549 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
1550 | if (IS_ERR(pdrvdata.class)) { | |
1551 | err = PTR_ERR(pdrvdata.class); | |
1552 | pr_err("Error %d creating virtio-ports class\n", err); | |
1553 | return err; | |
1554 | } | |
d99393ef AS |
1555 | |
1556 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
1557 | if (!pdrvdata.debugfs_dir) { | |
1558 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
1559 | PTR_ERR(pdrvdata.debugfs_dir)); | |
1560 | } | |
38edf58d AS |
1561 | INIT_LIST_HEAD(&pdrvdata.consoles); |
1562 | ||
31610434 RR |
1563 | return register_virtio_driver(&virtio_console); |
1564 | } | |
7177876f AS |
1565 | |
1566 | static void __exit fini(void) | |
1567 | { | |
1568 | unregister_virtio_driver(&virtio_console); | |
1569 | ||
1570 | class_destroy(pdrvdata.class); | |
1571 | if (pdrvdata.debugfs_dir) | |
1572 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
1573 | } | |
31610434 | 1574 | module_init(init); |
7177876f | 1575 | module_exit(fini); |
31610434 RR |
1576 | |
1577 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1578 | MODULE_DESCRIPTION("Virtio console driver"); | |
1579 | MODULE_LICENSE("GPL"); |