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 | ||
b7a41301 MT |
36 | /* Moved here from .h file in order to disable MULTIPORT. */ |
37 | #define VIRTIO_CONSOLE_F_MULTIPORT 1 /* Does host provide multiple ports? */ | |
38 | ||
39 | struct virtio_console_multiport_conf { | |
40 | struct virtio_console_config config; | |
41 | /* max. number of ports this device can hold */ | |
42 | __u32 max_nr_ports; | |
43 | /* number of ports added so far */ | |
44 | __u32 nr_ports; | |
45 | } __attribute__((packed)); | |
46 | ||
47 | /* | |
48 | * A message that's passed between the Host and the Guest for a | |
49 | * particular port. | |
50 | */ | |
51 | struct virtio_console_control { | |
52 | __u32 id; /* Port number */ | |
53 | __u16 event; /* The kind of control event (see below) */ | |
54 | __u16 value; /* Extra information for the key */ | |
55 | }; | |
56 | ||
57 | /* Some events for control messages */ | |
58 | #define VIRTIO_CONSOLE_PORT_READY 0 | |
59 | #define VIRTIO_CONSOLE_CONSOLE_PORT 1 | |
60 | #define VIRTIO_CONSOLE_RESIZE 2 | |
61 | #define VIRTIO_CONSOLE_PORT_OPEN 3 | |
62 | #define VIRTIO_CONSOLE_PORT_NAME 4 | |
63 | #define VIRTIO_CONSOLE_PORT_REMOVE 5 | |
64 | ||
38edf58d AS |
65 | /* |
66 | * This is a global struct for storing common data for all the devices | |
67 | * this driver handles. | |
68 | * | |
69 | * Mainly, it has a linked list for all the consoles in one place so | |
70 | * that callbacks from hvc for get_chars(), put_chars() work properly | |
71 | * across multiple devices and multiple ports per device. | |
72 | */ | |
73 | struct ports_driver_data { | |
fb08bd27 AS |
74 | /* Used for registering chardevs */ |
75 | struct class *class; | |
76 | ||
d99393ef AS |
77 | /* Used for exporting per-port information to debugfs */ |
78 | struct dentry *debugfs_dir; | |
79 | ||
fb08bd27 AS |
80 | /* Number of devices this driver is handling */ |
81 | unsigned int index; | |
82 | ||
d8a02bd5 RR |
83 | /* |
84 | * This is used to keep track of the number of hvc consoles | |
85 | * spawned by this driver. This number is given as the first | |
86 | * argument to hvc_alloc(). To correctly map an initial | |
87 | * console spawned via hvc_instantiate to the console being | |
88 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
89 | * | |
90 | * We also just assume the first console being initialised was | |
91 | * the first one that got used as the initial console. | |
92 | */ | |
93 | unsigned int next_vtermno; | |
94 | ||
38edf58d AS |
95 | /* All the console devices handled by this driver */ |
96 | struct list_head consoles; | |
97 | }; | |
98 | static struct ports_driver_data pdrvdata; | |
99 | ||
100 | DEFINE_SPINLOCK(pdrvdata_lock); | |
101 | ||
4f23c573 AS |
102 | /* This struct holds information that's relevant only for console ports */ |
103 | struct console { | |
104 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
105 | struct list_head list; | |
106 | ||
107 | /* The hvc device associated with this console port */ | |
108 | struct hvc_struct *hvc; | |
109 | ||
110 | /* | |
111 | * This number identifies the number that we used to register | |
112 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
113 | * number passed on by the hvc callbacks to us to | |
114 | * differentiate between the other console ports handled by | |
115 | * this driver | |
116 | */ | |
117 | u32 vtermno; | |
118 | }; | |
119 | ||
fdb9a054 AS |
120 | struct port_buffer { |
121 | char *buf; | |
122 | ||
123 | /* size of the buffer in *buf above */ | |
124 | size_t size; | |
125 | ||
126 | /* used length of the buffer */ | |
127 | size_t len; | |
128 | /* offset in the buf from which to consume data */ | |
129 | size_t offset; | |
130 | }; | |
131 | ||
17634ba2 AS |
132 | /* |
133 | * This is a per-device struct that stores data common to all the | |
134 | * ports for that device (vdev->priv). | |
135 | */ | |
136 | struct ports_device { | |
137 | /* | |
138 | * Workqueue handlers where we process deferred work after | |
139 | * notification | |
140 | */ | |
141 | struct work_struct control_work; | |
7f5d810d | 142 | struct work_struct config_work; |
17634ba2 AS |
143 | |
144 | struct list_head ports; | |
145 | ||
146 | /* To protect the list of ports */ | |
147 | spinlock_t ports_lock; | |
148 | ||
149 | /* To protect the vq operations for the control channel */ | |
150 | spinlock_t cvq_lock; | |
151 | ||
152 | /* The current config space is stored here */ | |
b7a41301 | 153 | struct virtio_console_multiport_conf config; |
17634ba2 AS |
154 | |
155 | /* The virtio device we're associated with */ | |
156 | struct virtio_device *vdev; | |
157 | ||
158 | /* | |
159 | * A couple of virtqueues for the control channel: one for | |
160 | * guest->host transfers, one for host->guest transfers | |
161 | */ | |
162 | struct virtqueue *c_ivq, *c_ovq; | |
163 | ||
164 | /* Array of per-port IO virtqueues */ | |
165 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
166 | |
167 | /* Used for numbering devices for sysfs and debugfs */ | |
168 | unsigned int drv_index; | |
169 | ||
170 | /* Major number for this device. Ports will be created as minors. */ | |
171 | int chr_major; | |
17634ba2 AS |
172 | }; |
173 | ||
1c85bf35 | 174 | /* This struct holds the per-port data */ |
21206ede | 175 | struct port { |
17634ba2 AS |
176 | /* Next port in the list, head is in the ports_device */ |
177 | struct list_head list; | |
178 | ||
1c85bf35 AS |
179 | /* Pointer to the parent virtio_console device */ |
180 | struct ports_device *portdev; | |
fdb9a054 AS |
181 | |
182 | /* The current buffer from which data has to be fed to readers */ | |
183 | struct port_buffer *inbuf; | |
21206ede | 184 | |
203baab8 AS |
185 | /* |
186 | * To protect the operations on the in_vq associated with this | |
187 | * port. Has to be a spinlock because it can be called from | |
188 | * interrupt context (get_char()). | |
189 | */ | |
190 | spinlock_t inbuf_lock; | |
191 | ||
1c85bf35 AS |
192 | /* The IO vqs for this port */ |
193 | struct virtqueue *in_vq, *out_vq; | |
194 | ||
d99393ef AS |
195 | /* File in the debugfs directory that exposes this port's information */ |
196 | struct dentry *debugfs_file; | |
197 | ||
4f23c573 AS |
198 | /* |
199 | * The entries in this struct will be valid if this port is | |
200 | * hooked up to an hvc console | |
201 | */ | |
202 | struct console cons; | |
17634ba2 | 203 | |
fb08bd27 AS |
204 | /* Each port associates with a separate char device */ |
205 | struct cdev cdev; | |
206 | struct device *dev; | |
207 | ||
2030fa49 AS |
208 | /* A waitqueue for poll() or blocking read operations */ |
209 | wait_queue_head_t waitqueue; | |
210 | ||
431edb8a AS |
211 | /* The 'name' of the port that we expose via sysfs properties */ |
212 | char *name; | |
213 | ||
17634ba2 AS |
214 | /* The 'id' to identify the port with the Host */ |
215 | u32 id; | |
2030fa49 AS |
216 | |
217 | /* Is the host device open */ | |
218 | bool host_connected; | |
3c7969cc AS |
219 | |
220 | /* We should allow only one process to open a port */ | |
221 | bool guest_connected; | |
21206ede | 222 | }; |
31610434 | 223 | |
971f3390 RR |
224 | /* This is the very early arch-specified put chars function. */ |
225 | static int (*early_put_chars)(u32, const char *, int); | |
226 | ||
38edf58d AS |
227 | static struct port *find_port_by_vtermno(u32 vtermno) |
228 | { | |
229 | struct port *port; | |
4f23c573 | 230 | struct console *cons; |
38edf58d AS |
231 | unsigned long flags; |
232 | ||
233 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
234 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
235 | if (cons->vtermno == vtermno) { | |
236 | port = container_of(cons, struct port, cons); | |
38edf58d | 237 | goto out; |
4f23c573 | 238 | } |
38edf58d AS |
239 | } |
240 | port = NULL; | |
241 | out: | |
242 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
243 | return port; | |
244 | } | |
245 | ||
17634ba2 AS |
246 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
247 | { | |
248 | struct port *port; | |
249 | unsigned long flags; | |
250 | ||
251 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
252 | list_for_each_entry(port, &portdev->ports, list) | |
253 | if (port->id == id) | |
254 | goto out; | |
255 | port = NULL; | |
256 | out: | |
257 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
258 | ||
259 | return port; | |
260 | } | |
261 | ||
203baab8 AS |
262 | static struct port *find_port_by_vq(struct ports_device *portdev, |
263 | struct virtqueue *vq) | |
264 | { | |
265 | struct port *port; | |
203baab8 AS |
266 | unsigned long flags; |
267 | ||
17634ba2 AS |
268 | spin_lock_irqsave(&portdev->ports_lock, flags); |
269 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
270 | if (port->in_vq == vq || port->out_vq == vq) |
271 | goto out; | |
203baab8 AS |
272 | port = NULL; |
273 | out: | |
17634ba2 | 274 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
275 | return port; |
276 | } | |
277 | ||
17634ba2 AS |
278 | static bool is_console_port(struct port *port) |
279 | { | |
280 | if (port->cons.hvc) | |
281 | return true; | |
282 | return false; | |
283 | } | |
284 | ||
285 | static inline bool use_multiport(struct ports_device *portdev) | |
286 | { | |
287 | /* | |
288 | * This condition can be true when put_chars is called from | |
289 | * early_init | |
290 | */ | |
291 | if (!portdev->vdev) | |
292 | return 0; | |
293 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
294 | } | |
295 | ||
fdb9a054 AS |
296 | static void free_buf(struct port_buffer *buf) |
297 | { | |
298 | kfree(buf->buf); | |
299 | kfree(buf); | |
300 | } | |
301 | ||
302 | static struct port_buffer *alloc_buf(size_t buf_size) | |
303 | { | |
304 | struct port_buffer *buf; | |
305 | ||
306 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
307 | if (!buf) | |
308 | goto fail; | |
309 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
310 | if (!buf->buf) | |
311 | goto free_buf; | |
312 | buf->len = 0; | |
313 | buf->offset = 0; | |
314 | buf->size = buf_size; | |
315 | return buf; | |
316 | ||
317 | free_buf: | |
318 | kfree(buf); | |
319 | fail: | |
320 | return NULL; | |
321 | } | |
322 | ||
a3cde449 AS |
323 | /* Callers should take appropriate locks */ |
324 | static void *get_inbuf(struct port *port) | |
325 | { | |
326 | struct port_buffer *buf; | |
327 | struct virtqueue *vq; | |
328 | unsigned int len; | |
329 | ||
330 | vq = port->in_vq; | |
331 | buf = vq->vq_ops->get_buf(vq, &len); | |
332 | if (buf) { | |
333 | buf->len = len; | |
334 | buf->offset = 0; | |
335 | } | |
336 | return buf; | |
337 | } | |
338 | ||
e27b5198 AS |
339 | /* |
340 | * Create a scatter-gather list representing our input buffer and put | |
341 | * it in the queue. | |
342 | * | |
343 | * Callers should take appropriate locks. | |
344 | */ | |
203baab8 | 345 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
346 | { |
347 | struct scatterlist sg[1]; | |
203baab8 | 348 | int ret; |
1c85bf35 | 349 | |
e27b5198 AS |
350 | sg_init_one(sg, buf->buf, buf->size); |
351 | ||
203baab8 | 352 | ret = vq->vq_ops->add_buf(vq, sg, 0, 1, buf); |
e27b5198 | 353 | vq->vq_ops->kick(vq); |
203baab8 AS |
354 | return ret; |
355 | } | |
356 | ||
88f251ac AS |
357 | /* Discard any unread data this port has. Callers lockers. */ |
358 | static void discard_port_data(struct port *port) | |
359 | { | |
360 | struct port_buffer *buf; | |
361 | struct virtqueue *vq; | |
362 | unsigned int len; | |
d6933561 | 363 | int ret; |
88f251ac AS |
364 | |
365 | vq = port->in_vq; | |
366 | if (port->inbuf) | |
367 | buf = port->inbuf; | |
368 | else | |
369 | buf = vq->vq_ops->get_buf(vq, &len); | |
370 | ||
d6933561 AS |
371 | ret = 0; |
372 | while (buf) { | |
373 | if (add_inbuf(vq, buf) < 0) { | |
374 | ret++; | |
375 | free_buf(buf); | |
376 | } | |
377 | buf = vq->vq_ops->get_buf(vq, &len); | |
88f251ac | 378 | } |
88f251ac | 379 | port->inbuf = NULL; |
d6933561 AS |
380 | if (ret) |
381 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", | |
382 | ret); | |
88f251ac AS |
383 | } |
384 | ||
203baab8 AS |
385 | static bool port_has_data(struct port *port) |
386 | { | |
387 | unsigned long flags; | |
388 | bool ret; | |
389 | ||
203baab8 | 390 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 391 | if (port->inbuf) { |
203baab8 | 392 | ret = true; |
d6933561 AS |
393 | goto out; |
394 | } | |
395 | port->inbuf = get_inbuf(port); | |
396 | if (port->inbuf) { | |
397 | ret = true; | |
398 | goto out; | |
399 | } | |
400 | ret = false; | |
401 | out: | |
203baab8 | 402 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
403 | return ret; |
404 | } | |
405 | ||
17634ba2 AS |
406 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
407 | unsigned int value) | |
408 | { | |
409 | struct scatterlist sg[1]; | |
410 | struct virtio_console_control cpkt; | |
411 | struct virtqueue *vq; | |
604b2ad7 | 412 | unsigned int len; |
17634ba2 AS |
413 | |
414 | if (!use_multiport(port->portdev)) | |
415 | return 0; | |
416 | ||
417 | cpkt.id = port->id; | |
418 | cpkt.event = event; | |
419 | cpkt.value = value; | |
420 | ||
421 | vq = port->portdev->c_ovq; | |
422 | ||
423 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
424 | if (vq->vq_ops->add_buf(vq, sg, 1, 0, &cpkt) >= 0) { | |
425 | vq->vq_ops->kick(vq); | |
426 | while (!vq->vq_ops->get_buf(vq, &len)) | |
427 | cpu_relax(); | |
428 | } | |
429 | return 0; | |
430 | } | |
431 | ||
f997f00b AS |
432 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count) |
433 | { | |
434 | struct scatterlist sg[1]; | |
435 | struct virtqueue *out_vq; | |
436 | ssize_t ret; | |
437 | unsigned int len; | |
438 | ||
439 | out_vq = port->out_vq; | |
440 | ||
441 | sg_init_one(sg, in_buf, in_count); | |
442 | ret = out_vq->vq_ops->add_buf(out_vq, sg, 1, 0, in_buf); | |
443 | ||
444 | /* Tell Host to go! */ | |
445 | out_vq->vq_ops->kick(out_vq); | |
446 | ||
447 | if (ret < 0) { | |
9ff4cfab | 448 | in_count = 0; |
f997f00b AS |
449 | goto fail; |
450 | } | |
451 | ||
9ff4cfab | 452 | /* Wait till the host acknowledges it pushed out the data we sent. */ |
f997f00b AS |
453 | while (!out_vq->vq_ops->get_buf(out_vq, &len)) |
454 | cpu_relax(); | |
455 | fail: | |
456 | /* We're expected to return the amount of data we wrote */ | |
9ff4cfab | 457 | return in_count; |
f997f00b AS |
458 | } |
459 | ||
203baab8 AS |
460 | /* |
461 | * Give out the data that's requested from the buffer that we have | |
462 | * queued up. | |
463 | */ | |
b766ceed AS |
464 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
465 | bool to_user) | |
203baab8 AS |
466 | { |
467 | struct port_buffer *buf; | |
468 | unsigned long flags; | |
469 | ||
470 | if (!out_count || !port_has_data(port)) | |
471 | return 0; | |
472 | ||
473 | buf = port->inbuf; | |
b766ceed | 474 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 475 | |
b766ceed AS |
476 | if (to_user) { |
477 | ssize_t ret; | |
478 | ||
479 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
480 | if (ret) | |
481 | return -EFAULT; | |
482 | } else { | |
483 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
484 | } | |
203baab8 | 485 | |
203baab8 AS |
486 | buf->offset += out_count; |
487 | ||
488 | if (buf->offset == buf->len) { | |
489 | /* | |
490 | * We're done using all the data in this buffer. | |
491 | * Re-queue so that the Host can send us more data. | |
492 | */ | |
493 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
494 | port->inbuf = NULL; | |
495 | ||
496 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 497 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
498 | |
499 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
500 | } | |
b766ceed | 501 | /* Return the number of bytes actually copied */ |
203baab8 | 502 | return out_count; |
e27b5198 AS |
503 | } |
504 | ||
2030fa49 AS |
505 | /* The condition that must be true for polling to end */ |
506 | static bool wait_is_over(struct port *port) | |
507 | { | |
508 | return port_has_data(port) || !port->host_connected; | |
509 | } | |
510 | ||
511 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, | |
512 | size_t count, loff_t *offp) | |
513 | { | |
514 | struct port *port; | |
515 | ssize_t ret; | |
516 | ||
517 | port = filp->private_data; | |
518 | ||
519 | if (!port_has_data(port)) { | |
520 | /* | |
521 | * If nothing's connected on the host just return 0 in | |
522 | * case of list_empty; this tells the userspace app | |
523 | * that there's no connection | |
524 | */ | |
525 | if (!port->host_connected) | |
526 | return 0; | |
527 | if (filp->f_flags & O_NONBLOCK) | |
528 | return -EAGAIN; | |
529 | ||
530 | ret = wait_event_interruptible(port->waitqueue, | |
531 | wait_is_over(port)); | |
532 | if (ret < 0) | |
533 | return ret; | |
534 | } | |
535 | /* | |
536 | * We could've received a disconnection message while we were | |
537 | * waiting for more data. | |
538 | * | |
539 | * This check is not clubbed in the if() statement above as we | |
540 | * might receive some data as well as the host could get | |
541 | * disconnected after we got woken up from our wait. So we | |
542 | * really want to give off whatever data we have and only then | |
543 | * check for host_connected. | |
544 | */ | |
545 | if (!port_has_data(port) && !port->host_connected) | |
546 | return 0; | |
547 | ||
548 | return fill_readbuf(port, ubuf, count, true); | |
549 | } | |
550 | ||
551 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, | |
552 | size_t count, loff_t *offp) | |
553 | { | |
554 | struct port *port; | |
555 | char *buf; | |
556 | ssize_t ret; | |
557 | ||
558 | port = filp->private_data; | |
559 | ||
560 | count = min((size_t)(32 * 1024), count); | |
561 | ||
562 | buf = kmalloc(count, GFP_KERNEL); | |
563 | if (!buf) | |
564 | return -ENOMEM; | |
565 | ||
566 | ret = copy_from_user(buf, ubuf, count); | |
567 | if (ret) { | |
568 | ret = -EFAULT; | |
569 | goto free_buf; | |
570 | } | |
571 | ||
572 | ret = send_buf(port, buf, count); | |
573 | free_buf: | |
574 | kfree(buf); | |
575 | return ret; | |
576 | } | |
577 | ||
578 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) | |
579 | { | |
580 | struct port *port; | |
581 | unsigned int ret; | |
582 | ||
583 | port = filp->private_data; | |
584 | poll_wait(filp, &port->waitqueue, wait); | |
585 | ||
586 | ret = 0; | |
587 | if (port->inbuf) | |
588 | ret |= POLLIN | POLLRDNORM; | |
589 | if (port->host_connected) | |
590 | ret |= POLLOUT; | |
591 | if (!port->host_connected) | |
592 | ret |= POLLHUP; | |
593 | ||
594 | return ret; | |
595 | } | |
596 | ||
597 | static int port_fops_release(struct inode *inode, struct file *filp) | |
598 | { | |
599 | struct port *port; | |
600 | ||
601 | port = filp->private_data; | |
602 | ||
603 | /* Notify host of port being closed */ | |
604 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
605 | ||
88f251ac | 606 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
607 | port->guest_connected = false; |
608 | ||
88f251ac AS |
609 | discard_port_data(port); |
610 | ||
611 | spin_unlock_irq(&port->inbuf_lock); | |
612 | ||
2030fa49 AS |
613 | return 0; |
614 | } | |
615 | ||
616 | static int port_fops_open(struct inode *inode, struct file *filp) | |
617 | { | |
618 | struct cdev *cdev = inode->i_cdev; | |
619 | struct port *port; | |
620 | ||
621 | port = container_of(cdev, struct port, cdev); | |
622 | filp->private_data = port; | |
623 | ||
624 | /* | |
625 | * Don't allow opening of console port devices -- that's done | |
626 | * via /dev/hvc | |
627 | */ | |
628 | if (is_console_port(port)) | |
629 | return -ENXIO; | |
630 | ||
3c7969cc AS |
631 | /* Allow only one process to open a particular port at a time */ |
632 | spin_lock_irq(&port->inbuf_lock); | |
633 | if (port->guest_connected) { | |
634 | spin_unlock_irq(&port->inbuf_lock); | |
635 | return -EMFILE; | |
636 | } | |
637 | ||
638 | port->guest_connected = true; | |
639 | spin_unlock_irq(&port->inbuf_lock); | |
640 | ||
2030fa49 AS |
641 | /* Notify host of port being opened */ |
642 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
647 | /* | |
648 | * The file operations that we support: programs in the guest can open | |
649 | * a console device, read from it, write to it, poll for data and | |
650 | * close it. The devices are at | |
651 | * /dev/vport<device number>p<port number> | |
652 | */ | |
653 | static const struct file_operations port_fops = { | |
654 | .owner = THIS_MODULE, | |
655 | .open = port_fops_open, | |
656 | .read = port_fops_read, | |
657 | .write = port_fops_write, | |
658 | .poll = port_fops_poll, | |
659 | .release = port_fops_release, | |
660 | }; | |
661 | ||
a23ea924 RR |
662 | /* |
663 | * The put_chars() callback is pretty straightforward. | |
31610434 | 664 | * |
a23ea924 RR |
665 | * We turn the characters into a scatter-gather list, add it to the |
666 | * output queue and then kick the Host. Then we sit here waiting for | |
667 | * it to finish: inefficient in theory, but in practice | |
668 | * implementations will do it immediately (lguest's Launcher does). | |
669 | */ | |
31610434 RR |
670 | static int put_chars(u32 vtermno, const char *buf, int count) |
671 | { | |
21206ede | 672 | struct port *port; |
38edf58d | 673 | |
162a689a FD |
674 | if (unlikely(early_put_chars)) |
675 | return early_put_chars(vtermno, buf, count); | |
676 | ||
38edf58d AS |
677 | port = find_port_by_vtermno(vtermno); |
678 | if (!port) | |
679 | return 0; | |
31610434 | 680 | |
f997f00b | 681 | return send_buf(port, (void *)buf, count); |
31610434 RR |
682 | } |
683 | ||
a23ea924 RR |
684 | /* |
685 | * get_chars() is the callback from the hvc_console infrastructure | |
686 | * when an interrupt is received. | |
31610434 | 687 | * |
203baab8 AS |
688 | * We call out to fill_readbuf that gets us the required data from the |
689 | * buffers that are queued up. | |
a23ea924 | 690 | */ |
31610434 RR |
691 | static int get_chars(u32 vtermno, char *buf, int count) |
692 | { | |
21206ede RR |
693 | struct port *port; |
694 | ||
38edf58d AS |
695 | port = find_port_by_vtermno(vtermno); |
696 | if (!port) | |
697 | return 0; | |
21206ede | 698 | |
31610434 | 699 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 700 | BUG_ON(!port->in_vq); |
31610434 | 701 | |
b766ceed | 702 | return fill_readbuf(port, buf, count, false); |
31610434 | 703 | } |
31610434 | 704 | |
cb06e367 | 705 | static void resize_console(struct port *port) |
c2983458 | 706 | { |
cb06e367 | 707 | struct virtio_device *vdev; |
c2983458 CB |
708 | struct winsize ws; |
709 | ||
2de16a49 AS |
710 | /* The port could have been hot-unplugged */ |
711 | if (!port) | |
712 | return; | |
713 | ||
cb06e367 AS |
714 | vdev = port->portdev->vdev; |
715 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) { | |
716 | vdev->config->get(vdev, | |
717 | offsetof(struct virtio_console_config, cols), | |
718 | &ws.ws_col, sizeof(u16)); | |
719 | vdev->config->get(vdev, | |
720 | offsetof(struct virtio_console_config, rows), | |
721 | &ws.ws_row, sizeof(u16)); | |
4f23c573 | 722 | hvc_resize(port->cons.hvc, ws); |
c2983458 CB |
723 | } |
724 | } | |
725 | ||
38edf58d | 726 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
727 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
728 | { | |
38edf58d AS |
729 | struct port *port; |
730 | ||
731 | port = find_port_by_vtermno(hp->vtermno); | |
732 | if (!port) | |
733 | return -EINVAL; | |
734 | ||
91fcad19 | 735 | hp->irq_requested = 1; |
cb06e367 | 736 | resize_console(port); |
c2983458 | 737 | |
91fcad19 CB |
738 | return 0; |
739 | } | |
740 | ||
741 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
742 | { | |
743 | hp->irq_requested = 0; | |
744 | } | |
745 | ||
17634ba2 | 746 | /* The operations for console ports. */ |
1dff3996 | 747 | static const struct hv_ops hv_ops = { |
971f3390 RR |
748 | .get_chars = get_chars, |
749 | .put_chars = put_chars, | |
750 | .notifier_add = notifier_add_vio, | |
751 | .notifier_del = notifier_del_vio, | |
752 | .notifier_hangup = notifier_del_vio, | |
753 | }; | |
754 | ||
755 | /* | |
756 | * Console drivers are initialized very early so boot messages can go | |
757 | * out, so we do things slightly differently from the generic virtio | |
758 | * initialization of the net and block drivers. | |
759 | * | |
760 | * At this stage, the console is output-only. It's too early to set | |
761 | * up a virtqueue, so we let the drivers do some boutique early-output | |
762 | * thing. | |
763 | */ | |
764 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
765 | { | |
766 | early_put_chars = put_chars; | |
767 | return hvc_instantiate(0, 0, &hv_ops); | |
768 | } | |
769 | ||
17634ba2 | 770 | int init_port_console(struct port *port) |
cfa6d379 AS |
771 | { |
772 | int ret; | |
773 | ||
774 | /* | |
775 | * The Host's telling us this port is a console port. Hook it | |
776 | * up with an hvc console. | |
777 | * | |
778 | * To set up and manage our virtual console, we call | |
779 | * hvc_alloc(). | |
780 | * | |
781 | * The first argument of hvc_alloc() is the virtual console | |
782 | * number. The second argument is the parameter for the | |
783 | * notification mechanism (like irq number). We currently | |
784 | * leave this as zero, virtqueues have implicit notifications. | |
785 | * | |
786 | * The third argument is a "struct hv_ops" containing the | |
787 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
788 | * pointers. The final argument is the output buffer size: we | |
789 | * can do any size, so we put PAGE_SIZE here. | |
790 | */ | |
791 | port->cons.vtermno = pdrvdata.next_vtermno; | |
792 | ||
793 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
794 | if (IS_ERR(port->cons.hvc)) { | |
795 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
796 | dev_err(port->dev, |
797 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
798 | port->cons.hvc = NULL; |
799 | return ret; | |
800 | } | |
801 | spin_lock_irq(&pdrvdata_lock); | |
802 | pdrvdata.next_vtermno++; | |
803 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
804 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 805 | port->guest_connected = true; |
cfa6d379 | 806 | |
2030fa49 AS |
807 | /* Notify host of port being opened */ |
808 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
809 | ||
cfa6d379 AS |
810 | return 0; |
811 | } | |
812 | ||
431edb8a AS |
813 | static ssize_t show_port_name(struct device *dev, |
814 | struct device_attribute *attr, char *buffer) | |
815 | { | |
816 | struct port *port; | |
817 | ||
818 | port = dev_get_drvdata(dev); | |
819 | ||
820 | return sprintf(buffer, "%s\n", port->name); | |
821 | } | |
822 | ||
823 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
824 | ||
825 | static struct attribute *port_sysfs_entries[] = { | |
826 | &dev_attr_name.attr, | |
827 | NULL | |
828 | }; | |
829 | ||
830 | static struct attribute_group port_attribute_group = { | |
831 | .name = NULL, /* put in device directory */ | |
832 | .attrs = port_sysfs_entries, | |
833 | }; | |
834 | ||
d99393ef AS |
835 | static int debugfs_open(struct inode *inode, struct file *filp) |
836 | { | |
837 | filp->private_data = inode->i_private; | |
838 | return 0; | |
839 | } | |
840 | ||
841 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, | |
842 | size_t count, loff_t *offp) | |
843 | { | |
844 | struct port *port; | |
845 | char *buf; | |
846 | ssize_t ret, out_offset, out_count; | |
847 | ||
848 | out_count = 1024; | |
849 | buf = kmalloc(out_count, GFP_KERNEL); | |
850 | if (!buf) | |
851 | return -ENOMEM; | |
852 | ||
853 | port = filp->private_data; | |
854 | out_offset = 0; | |
855 | out_offset += snprintf(buf + out_offset, out_count, | |
856 | "name: %s\n", port->name ? port->name : ""); | |
857 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
858 | "guest_connected: %d\n", port->guest_connected); | |
859 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
860 | "host_connected: %d\n", port->host_connected); | |
861 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
862 | "is_console: %s\n", | |
863 | is_console_port(port) ? "yes" : "no"); | |
864 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
865 | "console_vtermno: %u\n", port->cons.vtermno); | |
866 | ||
867 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
868 | kfree(buf); | |
869 | return ret; | |
870 | } | |
871 | ||
872 | static const struct file_operations port_debugfs_ops = { | |
873 | .owner = THIS_MODULE, | |
874 | .open = debugfs_open, | |
875 | .read = debugfs_read, | |
876 | }; | |
877 | ||
1f7aa42d AS |
878 | /* Remove all port-specific data. */ |
879 | static int remove_port(struct port *port) | |
880 | { | |
a9cdd485 AS |
881 | struct port_buffer *buf; |
882 | ||
1f7aa42d AS |
883 | spin_lock_irq(&port->portdev->ports_lock); |
884 | list_del(&port->list); | |
885 | spin_unlock_irq(&port->portdev->ports_lock); | |
886 | ||
887 | if (is_console_port(port)) { | |
888 | spin_lock_irq(&pdrvdata_lock); | |
889 | list_del(&port->cons.list); | |
890 | spin_unlock_irq(&pdrvdata_lock); | |
891 | hvc_remove(port->cons.hvc); | |
892 | } | |
893 | if (port->guest_connected) | |
894 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
895 | ||
1f7aa42d AS |
896 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); |
897 | device_destroy(pdrvdata.class, port->dev->devt); | |
898 | cdev_del(&port->cdev); | |
899 | ||
a9cdd485 | 900 | /* Remove unused data this port might have received. */ |
1f7aa42d | 901 | discard_port_data(port); |
a9cdd485 AS |
902 | |
903 | /* Remove buffers we queued up for the Host to send us data in. */ | |
904 | while ((buf = port->in_vq->vq_ops->detach_unused_buf(port->in_vq))) | |
905 | free_buf(buf); | |
906 | ||
1f7aa42d AS |
907 | kfree(port->name); |
908 | ||
d99393ef AS |
909 | debugfs_remove(port->debugfs_file); |
910 | ||
1f7aa42d AS |
911 | kfree(port); |
912 | return 0; | |
913 | } | |
914 | ||
17634ba2 AS |
915 | /* Any private messages that the Host and Guest want to share */ |
916 | static void handle_control_message(struct ports_device *portdev, | |
917 | struct port_buffer *buf) | |
918 | { | |
919 | struct virtio_console_control *cpkt; | |
920 | struct port *port; | |
431edb8a AS |
921 | size_t name_size; |
922 | int err; | |
17634ba2 AS |
923 | |
924 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
925 | ||
926 | port = find_port_by_id(portdev, cpkt->id); | |
927 | if (!port) { | |
928 | /* No valid header at start of buffer. Drop it. */ | |
929 | dev_dbg(&portdev->vdev->dev, | |
930 | "Invalid index %u in control packet\n", cpkt->id); | |
931 | return; | |
932 | } | |
933 | ||
934 | switch (cpkt->event) { | |
935 | case VIRTIO_CONSOLE_CONSOLE_PORT: | |
936 | if (!cpkt->value) | |
937 | break; | |
938 | if (is_console_port(port)) | |
939 | break; | |
940 | ||
941 | init_port_console(port); | |
942 | /* | |
943 | * Could remove the port here in case init fails - but | |
944 | * have to notify the host first. | |
945 | */ | |
946 | break; | |
947 | case VIRTIO_CONSOLE_RESIZE: | |
948 | if (!is_console_port(port)) | |
949 | break; | |
950 | port->cons.hvc->irq_requested = 1; | |
951 | resize_console(port); | |
952 | break; | |
2030fa49 AS |
953 | case VIRTIO_CONSOLE_PORT_OPEN: |
954 | port->host_connected = cpkt->value; | |
955 | wake_up_interruptible(&port->waitqueue); | |
956 | break; | |
431edb8a AS |
957 | case VIRTIO_CONSOLE_PORT_NAME: |
958 | /* | |
959 | * Skip the size of the header and the cpkt to get the size | |
960 | * of the name that was sent | |
961 | */ | |
962 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
963 | ||
964 | port->name = kmalloc(name_size, GFP_KERNEL); | |
965 | if (!port->name) { | |
966 | dev_err(port->dev, | |
967 | "Not enough space to store port name\n"); | |
968 | break; | |
969 | } | |
970 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
971 | name_size - 1); | |
972 | port->name[name_size - 1] = 0; | |
973 | ||
974 | /* | |
975 | * Since we only have one sysfs attribute, 'name', | |
976 | * create it only if we have a name for the port. | |
977 | */ | |
978 | err = sysfs_create_group(&port->dev->kobj, | |
979 | &port_attribute_group); | |
ec64213c | 980 | if (err) { |
431edb8a AS |
981 | dev_err(port->dev, |
982 | "Error %d creating sysfs device attributes\n", | |
983 | err); | |
ec64213c AS |
984 | } else { |
985 | /* | |
986 | * Generate a udev event so that appropriate | |
987 | * symlinks can be created based on udev | |
988 | * rules. | |
989 | */ | |
990 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
991 | } | |
431edb8a | 992 | break; |
1f7aa42d AS |
993 | case VIRTIO_CONSOLE_PORT_REMOVE: |
994 | /* | |
995 | * Hot unplug the port. We don't decrement nr_ports | |
996 | * since we don't want to deal with extra complexities | |
997 | * of using the lowest-available port id: We can just | |
998 | * pick up the nr_ports number as the id and not have | |
999 | * userspace send it to us. This helps us in two | |
1000 | * ways: | |
1001 | * | |
1002 | * - We don't need to have a 'port_id' field in the | |
1003 | * config space when a port is hot-added. This is a | |
1004 | * good thing as we might queue up multiple hotplug | |
1005 | * requests issued in our workqueue. | |
1006 | * | |
1007 | * - Another way to deal with this would have been to | |
1008 | * use a bitmap of the active ports and select the | |
1009 | * lowest non-active port from that map. That | |
1010 | * bloats the already tight config space and we | |
1011 | * would end up artificially limiting the | |
1012 | * max. number of ports to sizeof(bitmap). Right | |
1013 | * now we can support 2^32 ports (as the port id is | |
1014 | * stored in a u32 type). | |
1015 | * | |
1016 | */ | |
1017 | remove_port(port); | |
1018 | break; | |
17634ba2 AS |
1019 | } |
1020 | } | |
1021 | ||
1022 | static void control_work_handler(struct work_struct *work) | |
1023 | { | |
1024 | struct ports_device *portdev; | |
1025 | struct virtqueue *vq; | |
1026 | struct port_buffer *buf; | |
1027 | unsigned int len; | |
1028 | ||
1029 | portdev = container_of(work, struct ports_device, control_work); | |
1030 | vq = portdev->c_ivq; | |
1031 | ||
1032 | spin_lock(&portdev->cvq_lock); | |
1033 | while ((buf = vq->vq_ops->get_buf(vq, &len))) { | |
1034 | spin_unlock(&portdev->cvq_lock); | |
1035 | ||
1036 | buf->len = len; | |
1037 | buf->offset = 0; | |
1038 | ||
1039 | handle_control_message(portdev, buf); | |
1040 | ||
1041 | spin_lock(&portdev->cvq_lock); | |
1042 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
1043 | dev_warn(&portdev->vdev->dev, | |
1044 | "Error adding buffer to queue\n"); | |
1045 | free_buf(buf); | |
1046 | } | |
1047 | } | |
1048 | spin_unlock(&portdev->cvq_lock); | |
1049 | } | |
1050 | ||
1051 | static void in_intr(struct virtqueue *vq) | |
1052 | { | |
1053 | struct port *port; | |
1054 | unsigned long flags; | |
1055 | ||
1056 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1057 | if (!port) | |
1058 | return; | |
1059 | ||
1060 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d6933561 AS |
1061 | if (!port->inbuf) |
1062 | port->inbuf = get_inbuf(port); | |
17634ba2 | 1063 | |
88f251ac AS |
1064 | /* |
1065 | * Don't queue up data when port is closed. This condition | |
1066 | * can be reached when a console port is not yet connected (no | |
1067 | * tty is spawned) and the host sends out data to console | |
1068 | * ports. For generic serial ports, the host won't | |
1069 | * (shouldn't) send data till the guest is connected. | |
1070 | */ | |
1071 | if (!port->guest_connected) | |
1072 | discard_port_data(port); | |
1073 | ||
17634ba2 AS |
1074 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1075 | ||
2030fa49 AS |
1076 | wake_up_interruptible(&port->waitqueue); |
1077 | ||
17634ba2 AS |
1078 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1079 | hvc_kick(); | |
1080 | } | |
1081 | ||
1082 | static void control_intr(struct virtqueue *vq) | |
1083 | { | |
1084 | struct ports_device *portdev; | |
1085 | ||
1086 | portdev = vq->vdev->priv; | |
1087 | schedule_work(&portdev->control_work); | |
1088 | } | |
1089 | ||
7f5d810d AS |
1090 | static void config_intr(struct virtio_device *vdev) |
1091 | { | |
1092 | struct ports_device *portdev; | |
1093 | ||
1094 | portdev = vdev->priv; | |
1095 | if (use_multiport(portdev)) { | |
1096 | /* Handle port hot-add */ | |
1097 | schedule_work(&portdev->config_work); | |
1098 | } | |
1099 | /* | |
1100 | * We'll use this way of resizing only for legacy support. | |
1101 | * For newer userspace (VIRTIO_CONSOLE_F_MULTPORT+), use | |
1102 | * control messages to indicate console size changes so that | |
1103 | * it can be done per-port | |
1104 | */ | |
1105 | resize_console(find_port_by_id(portdev, 0)); | |
1106 | } | |
1107 | ||
22a29eac | 1108 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
17634ba2 AS |
1109 | { |
1110 | struct port_buffer *buf; | |
335a64a5 AS |
1111 | unsigned int nr_added_bufs; |
1112 | int ret; | |
17634ba2 | 1113 | |
335a64a5 | 1114 | nr_added_bufs = 0; |
17634ba2 AS |
1115 | do { |
1116 | buf = alloc_buf(PAGE_SIZE); | |
1117 | if (!buf) | |
1118 | break; | |
1119 | ||
1120 | spin_lock_irq(lock); | |
335a64a5 AS |
1121 | ret = add_inbuf(vq, buf); |
1122 | if (ret < 0) { | |
17634ba2 AS |
1123 | spin_unlock_irq(lock); |
1124 | free_buf(buf); | |
1125 | break; | |
1126 | } | |
335a64a5 | 1127 | nr_added_bufs++; |
17634ba2 | 1128 | spin_unlock_irq(lock); |
335a64a5 | 1129 | } while (ret > 0); |
22a29eac | 1130 | |
335a64a5 | 1131 | return nr_added_bufs; |
17634ba2 AS |
1132 | } |
1133 | ||
1134 | static int add_port(struct ports_device *portdev, u32 id) | |
d8a02bd5 | 1135 | { |
d99393ef | 1136 | char debugfs_name[16]; |
21206ede | 1137 | struct port *port; |
d6933561 | 1138 | struct port_buffer *buf; |
fb08bd27 | 1139 | dev_t devt; |
335a64a5 | 1140 | unsigned int nr_added_bufs; |
31610434 | 1141 | int err; |
31610434 | 1142 | |
1c85bf35 | 1143 | port = kmalloc(sizeof(*port), GFP_KERNEL); |
d8a02bd5 RR |
1144 | if (!port) { |
1145 | err = -ENOMEM; | |
1146 | goto fail; | |
f550804a | 1147 | } |
73954488 | 1148 | |
1c85bf35 | 1149 | port->portdev = portdev; |
17634ba2 | 1150 | port->id = id; |
203baab8 | 1151 | |
431edb8a | 1152 | port->name = NULL; |
203baab8 | 1153 | port->inbuf = NULL; |
17634ba2 | 1154 | port->cons.hvc = NULL; |
203baab8 | 1155 | |
3c7969cc | 1156 | port->host_connected = port->guest_connected = false; |
2030fa49 | 1157 | |
17634ba2 AS |
1158 | port->in_vq = portdev->in_vqs[port->id]; |
1159 | port->out_vq = portdev->out_vqs[port->id]; | |
31610434 | 1160 | |
2030fa49 | 1161 | cdev_init(&port->cdev, &port_fops); |
fb08bd27 AS |
1162 | |
1163 | devt = MKDEV(portdev->chr_major, id); | |
1164 | err = cdev_add(&port->cdev, devt, 1); | |
1165 | if (err < 0) { | |
1166 | dev_err(&port->portdev->vdev->dev, | |
1167 | "Error %d adding cdev for port %u\n", err, id); | |
1168 | goto free_port; | |
1169 | } | |
1170 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1171 | devt, port, "vport%up%u", | |
1172 | port->portdev->drv_index, id); | |
1173 | if (IS_ERR(port->dev)) { | |
1174 | err = PTR_ERR(port->dev); | |
1175 | dev_err(&port->portdev->vdev->dev, | |
1176 | "Error %d creating device for port %u\n", | |
1177 | err, id); | |
1178 | goto free_cdev; | |
1179 | } | |
1180 | ||
203baab8 | 1181 | spin_lock_init(&port->inbuf_lock); |
2030fa49 | 1182 | init_waitqueue_head(&port->waitqueue); |
203baab8 | 1183 | |
d6933561 | 1184 | /* Fill the in_vq with buffers so the host can send us data. */ |
335a64a5 AS |
1185 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); |
1186 | if (!nr_added_bufs) { | |
d6933561 | 1187 | dev_err(port->dev, "Error allocating inbufs\n"); |
1c85bf35 | 1188 | err = -ENOMEM; |
fb08bd27 | 1189 | goto free_device; |
1c85bf35 | 1190 | } |
31610434 | 1191 | |
17634ba2 AS |
1192 | /* |
1193 | * If we're not using multiport support, this has to be a console port | |
1194 | */ | |
1195 | if (!use_multiport(port->portdev)) { | |
1196 | err = init_port_console(port); | |
1197 | if (err) | |
d6933561 | 1198 | goto free_inbufs; |
17634ba2 AS |
1199 | } |
1200 | ||
1201 | spin_lock_irq(&portdev->ports_lock); | |
1202 | list_add_tail(&port->list, &port->portdev->ports); | |
1203 | spin_unlock_irq(&portdev->ports_lock); | |
1204 | ||
1205 | /* | |
1206 | * Tell the Host we're set so that it can send us various | |
1207 | * configuration parameters for this port (eg, port name, | |
1208 | * caching, whether this is a console port, etc.) | |
1209 | */ | |
1210 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
38edf58d | 1211 | |
d99393ef AS |
1212 | if (pdrvdata.debugfs_dir) { |
1213 | /* | |
1214 | * Finally, create the debugfs file that we can use to | |
1215 | * inspect a port's state at any time | |
1216 | */ | |
1217 | sprintf(debugfs_name, "vport%up%u", | |
1218 | port->portdev->drv_index, id); | |
1219 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, | |
1220 | pdrvdata.debugfs_dir, | |
1221 | port, | |
1222 | &port_debugfs_ops); | |
1223 | } | |
1c85bf35 AS |
1224 | return 0; |
1225 | ||
d6933561 AS |
1226 | free_inbufs: |
1227 | while ((buf = port->in_vq->vq_ops->detach_unused_buf(port->in_vq))) | |
1228 | free_buf(buf); | |
fb08bd27 AS |
1229 | free_device: |
1230 | device_destroy(pdrvdata.class, port->dev->devt); | |
1231 | free_cdev: | |
1232 | cdev_del(&port->cdev); | |
1c85bf35 AS |
1233 | free_port: |
1234 | kfree(port); | |
1235 | fail: | |
1236 | return err; | |
1237 | } | |
1238 | ||
7f5d810d AS |
1239 | /* |
1240 | * The workhandler for config-space updates. | |
1241 | * | |
1242 | * This is called when ports are hot-added. | |
1243 | */ | |
1244 | static void config_work_handler(struct work_struct *work) | |
1245 | { | |
b7a41301 | 1246 | struct virtio_console_multiport_conf virtconconf; |
7f5d810d AS |
1247 | struct ports_device *portdev; |
1248 | struct virtio_device *vdev; | |
1249 | int err; | |
1250 | ||
1251 | portdev = container_of(work, struct ports_device, config_work); | |
1252 | ||
1253 | vdev = portdev->vdev; | |
1254 | vdev->config->get(vdev, | |
b7a41301 MT |
1255 | offsetof(struct virtio_console_multiport_conf, |
1256 | nr_ports), | |
7f5d810d AS |
1257 | &virtconconf.nr_ports, |
1258 | sizeof(virtconconf.nr_ports)); | |
1259 | ||
1260 | if (portdev->config.nr_ports == virtconconf.nr_ports) { | |
1261 | /* | |
1262 | * Port 0 got hot-added. Since we already did all the | |
1263 | * other initialisation for it, just tell the Host | |
1f7aa42d AS |
1264 | * that the port is ready if we find the port. In |
1265 | * case the port was hot-removed earlier, we call | |
1266 | * add_port to add the port. | |
7f5d810d AS |
1267 | */ |
1268 | struct port *port; | |
1269 | ||
1270 | port = find_port_by_id(portdev, 0); | |
1f7aa42d AS |
1271 | if (!port) |
1272 | add_port(portdev, 0); | |
1273 | else | |
1274 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
7f5d810d AS |
1275 | return; |
1276 | } | |
1277 | if (virtconconf.nr_ports > portdev->config.max_nr_ports) { | |
1278 | dev_warn(&vdev->dev, | |
1279 | "More ports specified (%u) than allowed (%u)", | |
1280 | portdev->config.nr_ports + 1, | |
1281 | portdev->config.max_nr_ports); | |
1282 | return; | |
1283 | } | |
1284 | if (virtconconf.nr_ports < portdev->config.nr_ports) | |
1285 | return; | |
1286 | ||
1287 | /* Hot-add ports */ | |
1288 | while (virtconconf.nr_ports - portdev->config.nr_ports) { | |
1289 | err = add_port(portdev, portdev->config.nr_ports); | |
1290 | if (err) | |
1291 | break; | |
1292 | portdev->config.nr_ports++; | |
1293 | } | |
1294 | } | |
1295 | ||
2658a79a AS |
1296 | static int init_vqs(struct ports_device *portdev) |
1297 | { | |
1298 | vq_callback_t **io_callbacks; | |
1299 | char **io_names; | |
1300 | struct virtqueue **vqs; | |
17634ba2 | 1301 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1302 | int err; |
1303 | ||
17634ba2 AS |
1304 | nr_ports = portdev->config.max_nr_ports; |
1305 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1306 | |
1307 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
1308 | if (!vqs) { | |
1309 | err = -ENOMEM; | |
1310 | goto fail; | |
1311 | } | |
1312 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); | |
1313 | if (!io_callbacks) { | |
1314 | err = -ENOMEM; | |
1315 | goto free_vqs; | |
1316 | } | |
1317 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); | |
1318 | if (!io_names) { | |
1319 | err = -ENOMEM; | |
1320 | goto free_callbacks; | |
1321 | } | |
1322 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1323 | GFP_KERNEL); | |
1324 | if (!portdev->in_vqs) { | |
1325 | err = -ENOMEM; | |
1326 | goto free_names; | |
1327 | } | |
1328 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), | |
1329 | GFP_KERNEL); | |
1330 | if (!portdev->out_vqs) { | |
1331 | err = -ENOMEM; | |
1332 | goto free_invqs; | |
1333 | } | |
1334 | ||
17634ba2 AS |
1335 | /* |
1336 | * For backward compat (newer host but older guest), the host | |
1337 | * spawns a console port first and also inits the vqs for port | |
1338 | * 0 before others. | |
1339 | */ | |
1340 | j = 0; | |
1341 | io_callbacks[j] = in_intr; | |
1342 | io_callbacks[j + 1] = NULL; | |
1343 | io_names[j] = "input"; | |
1344 | io_names[j + 1] = "output"; | |
1345 | j += 2; | |
1346 | ||
1347 | if (use_multiport(portdev)) { | |
1348 | io_callbacks[j] = control_intr; | |
1349 | io_callbacks[j + 1] = NULL; | |
1350 | io_names[j] = "control-i"; | |
1351 | io_names[j + 1] = "control-o"; | |
1352 | ||
1353 | for (i = 1; i < nr_ports; i++) { | |
1354 | j += 2; | |
1355 | io_callbacks[j] = in_intr; | |
1356 | io_callbacks[j + 1] = NULL; | |
1357 | io_names[j] = "input"; | |
1358 | io_names[j + 1] = "output"; | |
1359 | } | |
1360 | } | |
2658a79a AS |
1361 | /* Find the queues. */ |
1362 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1363 | io_callbacks, | |
1364 | (const char **)io_names); | |
1365 | if (err) | |
1366 | goto free_outvqs; | |
1367 | ||
17634ba2 | 1368 | j = 0; |
2658a79a AS |
1369 | portdev->in_vqs[0] = vqs[0]; |
1370 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1371 | j += 2; |
1372 | if (use_multiport(portdev)) { | |
1373 | portdev->c_ivq = vqs[j]; | |
1374 | portdev->c_ovq = vqs[j + 1]; | |
1375 | ||
1376 | for (i = 1; i < nr_ports; i++) { | |
1377 | j += 2; | |
1378 | portdev->in_vqs[i] = vqs[j]; | |
1379 | portdev->out_vqs[i] = vqs[j + 1]; | |
1380 | } | |
1381 | } | |
2658a79a AS |
1382 | kfree(io_callbacks); |
1383 | kfree(io_names); | |
1384 | kfree(vqs); | |
1385 | ||
1386 | return 0; | |
1387 | ||
1388 | free_names: | |
1389 | kfree(io_names); | |
1390 | free_callbacks: | |
1391 | kfree(io_callbacks); | |
1392 | free_outvqs: | |
1393 | kfree(portdev->out_vqs); | |
1394 | free_invqs: | |
1395 | kfree(portdev->in_vqs); | |
1396 | free_vqs: | |
1397 | kfree(vqs); | |
1398 | fail: | |
1399 | return err; | |
1400 | } | |
1401 | ||
fb08bd27 AS |
1402 | static const struct file_operations portdev_fops = { |
1403 | .owner = THIS_MODULE, | |
1404 | }; | |
1405 | ||
1c85bf35 AS |
1406 | /* |
1407 | * Once we're further in boot, we get probed like any other virtio | |
1408 | * device. | |
17634ba2 AS |
1409 | * |
1410 | * If the host also supports multiple console ports, we check the | |
1411 | * config space to see how many ports the host has spawned. We | |
1412 | * initialize each port found. | |
1c85bf35 AS |
1413 | */ |
1414 | static int __devinit virtcons_probe(struct virtio_device *vdev) | |
1415 | { | |
1c85bf35 | 1416 | struct ports_device *portdev; |
17634ba2 | 1417 | u32 i; |
1c85bf35 | 1418 | int err; |
17634ba2 | 1419 | bool multiport; |
1c85bf35 AS |
1420 | |
1421 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1422 | if (!portdev) { | |
1423 | err = -ENOMEM; | |
1424 | goto fail; | |
1425 | } | |
1426 | ||
1427 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1428 | portdev->vdev = vdev; | |
1429 | vdev->priv = portdev; | |
1430 | ||
fb08bd27 AS |
1431 | spin_lock_irq(&pdrvdata_lock); |
1432 | portdev->drv_index = pdrvdata.index++; | |
1433 | spin_unlock_irq(&pdrvdata_lock); | |
1434 | ||
1435 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1436 | &portdev_fops); | |
1437 | if (portdev->chr_major < 0) { | |
1438 | dev_err(&vdev->dev, | |
1439 | "Error %d registering chrdev for device %u\n", | |
1440 | portdev->chr_major, portdev->drv_index); | |
1441 | err = portdev->chr_major; | |
1442 | goto free; | |
1443 | } | |
1444 | ||
17634ba2 AS |
1445 | multiport = false; |
1446 | portdev->config.nr_ports = 1; | |
1447 | portdev->config.max_nr_ports = 1; | |
b7a41301 | 1448 | #if 0 /* Multiport is not quite ready yet --RR */ |
17634ba2 AS |
1449 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { |
1450 | multiport = true; | |
1451 | vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; | |
1452 | ||
b7a41301 MT |
1453 | vdev->config->get(vdev, |
1454 | offsetof(struct virtio_console_multiport_conf, | |
1455 | nr_ports), | |
17634ba2 AS |
1456 | &portdev->config.nr_ports, |
1457 | sizeof(portdev->config.nr_ports)); | |
b7a41301 MT |
1458 | vdev->config->get(vdev, |
1459 | offsetof(struct virtio_console_multiport_conf, | |
1460 | max_nr_ports), | |
17634ba2 AS |
1461 | &portdev->config.max_nr_ports, |
1462 | sizeof(portdev->config.max_nr_ports)); | |
1463 | if (portdev->config.nr_ports > portdev->config.max_nr_ports) { | |
1464 | dev_warn(&vdev->dev, | |
1465 | "More ports (%u) specified than allowed (%u). Will init %u ports.", | |
1466 | portdev->config.nr_ports, | |
1467 | portdev->config.max_nr_ports, | |
1468 | portdev->config.max_nr_ports); | |
1469 | ||
1470 | portdev->config.nr_ports = portdev->config.max_nr_ports; | |
1471 | } | |
1472 | } | |
1473 | ||
1474 | /* Let the Host know we support multiple ports.*/ | |
1475 | vdev->config->finalize_features(vdev); | |
b7a41301 | 1476 | #endif |
17634ba2 | 1477 | |
2658a79a AS |
1478 | err = init_vqs(portdev); |
1479 | if (err < 0) { | |
1480 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1481 | goto free_chrdev; |
2658a79a | 1482 | } |
1c85bf35 | 1483 | |
17634ba2 AS |
1484 | spin_lock_init(&portdev->ports_lock); |
1485 | INIT_LIST_HEAD(&portdev->ports); | |
1486 | ||
1487 | if (multiport) { | |
335a64a5 AS |
1488 | unsigned int nr_added_bufs; |
1489 | ||
17634ba2 AS |
1490 | spin_lock_init(&portdev->cvq_lock); |
1491 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
7f5d810d | 1492 | INIT_WORK(&portdev->config_work, &config_work_handler); |
17634ba2 | 1493 | |
335a64a5 AS |
1494 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
1495 | if (!nr_added_bufs) { | |
22a29eac AS |
1496 | dev_err(&vdev->dev, |
1497 | "Error allocating buffers for control queue\n"); | |
1498 | err = -ENOMEM; | |
1499 | goto free_vqs; | |
1500 | } | |
17634ba2 AS |
1501 | } |
1502 | ||
1503 | for (i = 0; i < portdev->config.nr_ports; i++) | |
1504 | add_port(portdev, i); | |
1c85bf35 | 1505 | |
971f3390 RR |
1506 | /* Start using the new console output. */ |
1507 | early_put_chars = NULL; | |
31610434 RR |
1508 | return 0; |
1509 | ||
22a29eac AS |
1510 | free_vqs: |
1511 | vdev->config->del_vqs(vdev); | |
1512 | kfree(portdev->in_vqs); | |
1513 | kfree(portdev->out_vqs); | |
fb08bd27 AS |
1514 | free_chrdev: |
1515 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1516 | free: |
1c85bf35 | 1517 | kfree(portdev); |
31610434 RR |
1518 | fail: |
1519 | return err; | |
1520 | } | |
1521 | ||
7177876f AS |
1522 | static void virtcons_remove(struct virtio_device *vdev) |
1523 | { | |
1524 | struct ports_device *portdev; | |
1525 | struct port *port, *port2; | |
1526 | struct port_buffer *buf; | |
1527 | unsigned int len; | |
1528 | ||
1529 | portdev = vdev->priv; | |
1530 | ||
1531 | cancel_work_sync(&portdev->control_work); | |
1532 | cancel_work_sync(&portdev->config_work); | |
1533 | ||
1534 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
1535 | remove_port(port); | |
1536 | ||
1537 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
1538 | ||
1539 | while ((buf = portdev->c_ivq->vq_ops->get_buf(portdev->c_ivq, &len))) | |
1540 | free_buf(buf); | |
1541 | ||
1542 | while ((buf = portdev->c_ivq->vq_ops->detach_unused_buf(portdev->c_ivq))) | |
1543 | free_buf(buf); | |
1544 | ||
1545 | vdev->config->del_vqs(vdev); | |
1546 | kfree(portdev->in_vqs); | |
1547 | kfree(portdev->out_vqs); | |
1548 | ||
1549 | kfree(portdev); | |
1550 | } | |
1551 | ||
31610434 RR |
1552 | static struct virtio_device_id id_table[] = { |
1553 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1554 | { 0 }, | |
1555 | }; | |
1556 | ||
c2983458 CB |
1557 | static unsigned int features[] = { |
1558 | VIRTIO_CONSOLE_F_SIZE, | |
1559 | }; | |
1560 | ||
31610434 | 1561 | static struct virtio_driver virtio_console = { |
c2983458 CB |
1562 | .feature_table = features, |
1563 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
1564 | .driver.name = KBUILD_MODNAME, |
1565 | .driver.owner = THIS_MODULE, | |
1566 | .id_table = id_table, | |
1567 | .probe = virtcons_probe, | |
7177876f | 1568 | .remove = virtcons_remove, |
7f5d810d | 1569 | .config_changed = config_intr, |
31610434 RR |
1570 | }; |
1571 | ||
1572 | static int __init init(void) | |
1573 | { | |
fb08bd27 AS |
1574 | int err; |
1575 | ||
1576 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
1577 | if (IS_ERR(pdrvdata.class)) { | |
1578 | err = PTR_ERR(pdrvdata.class); | |
1579 | pr_err("Error %d creating virtio-ports class\n", err); | |
1580 | return err; | |
1581 | } | |
d99393ef AS |
1582 | |
1583 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
1584 | if (!pdrvdata.debugfs_dir) { | |
1585 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
1586 | PTR_ERR(pdrvdata.debugfs_dir)); | |
1587 | } | |
38edf58d AS |
1588 | INIT_LIST_HEAD(&pdrvdata.consoles); |
1589 | ||
31610434 RR |
1590 | return register_virtio_driver(&virtio_console); |
1591 | } | |
7177876f AS |
1592 | |
1593 | static void __exit fini(void) | |
1594 | { | |
1595 | unregister_virtio_driver(&virtio_console); | |
1596 | ||
1597 | class_destroy(pdrvdata.class); | |
1598 | if (pdrvdata.debugfs_dir) | |
1599 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
1600 | } | |
31610434 | 1601 | module_init(init); |
7177876f | 1602 | module_exit(fini); |
31610434 RR |
1603 | |
1604 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1605 | MODULE_DESCRIPTION("Virtio console driver"); | |
1606 | MODULE_LICENSE("GPL"); |