Commit | Line | Data |
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a23ea924 RR |
1 | /* |
2 | * Copyright (C) 2006, 2007, 2009 Rusty Russell, IBM Corporation | |
5084f893 AS |
3 | * Copyright (C) 2009, 2010, 2011 Red Hat, Inc. |
4 | * Copyright (C) 2009, 2010, 2011 Amit Shah <amit.shah@redhat.com> | |
31610434 RR |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
fb08bd27 | 20 | #include <linux/cdev.h> |
d99393ef | 21 | #include <linux/debugfs.h> |
5e38483b | 22 | #include <linux/completion.h> |
fb08bd27 | 23 | #include <linux/device.h> |
31610434 | 24 | #include <linux/err.h> |
a08fa92d | 25 | #include <linux/freezer.h> |
2030fa49 | 26 | #include <linux/fs.h> |
eb5e89fc MH |
27 | #include <linux/splice.h> |
28 | #include <linux/pagemap.h> | |
31610434 | 29 | #include <linux/init.h> |
38edf58d | 30 | #include <linux/list.h> |
2030fa49 AS |
31 | #include <linux/poll.h> |
32 | #include <linux/sched.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
38edf58d | 34 | #include <linux/spinlock.h> |
31610434 RR |
35 | #include <linux/virtio.h> |
36 | #include <linux/virtio_console.h> | |
2030fa49 | 37 | #include <linux/wait.h> |
17634ba2 | 38 | #include <linux/workqueue.h> |
c22405c9 | 39 | #include <linux/module.h> |
51df0acc | 40 | #include "../tty/hvc/hvc_console.h" |
31610434 | 41 | |
38edf58d AS |
42 | /* |
43 | * This is a global struct for storing common data for all the devices | |
44 | * this driver handles. | |
45 | * | |
46 | * Mainly, it has a linked list for all the consoles in one place so | |
47 | * that callbacks from hvc for get_chars(), put_chars() work properly | |
48 | * across multiple devices and multiple ports per device. | |
49 | */ | |
50 | struct ports_driver_data { | |
fb08bd27 AS |
51 | /* Used for registering chardevs */ |
52 | struct class *class; | |
53 | ||
d99393ef AS |
54 | /* Used for exporting per-port information to debugfs */ |
55 | struct dentry *debugfs_dir; | |
56 | ||
6bdf2afd AS |
57 | /* List of all the devices we're handling */ |
58 | struct list_head portdevs; | |
59 | ||
fb08bd27 AS |
60 | /* Number of devices this driver is handling */ |
61 | unsigned int index; | |
62 | ||
d8a02bd5 RR |
63 | /* |
64 | * This is used to keep track of the number of hvc consoles | |
65 | * spawned by this driver. This number is given as the first | |
66 | * argument to hvc_alloc(). To correctly map an initial | |
67 | * console spawned via hvc_instantiate to the console being | |
68 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
69 | * | |
70 | * We also just assume the first console being initialised was | |
71 | * the first one that got used as the initial console. | |
72 | */ | |
73 | unsigned int next_vtermno; | |
74 | ||
38edf58d AS |
75 | /* All the console devices handled by this driver */ |
76 | struct list_head consoles; | |
77 | }; | |
78 | static struct ports_driver_data pdrvdata; | |
79 | ||
80 | DEFINE_SPINLOCK(pdrvdata_lock); | |
5e38483b | 81 | DECLARE_COMPLETION(early_console_added); |
38edf58d | 82 | |
4f23c573 AS |
83 | /* This struct holds information that's relevant only for console ports */ |
84 | struct console { | |
85 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
86 | struct list_head list; | |
87 | ||
88 | /* The hvc device associated with this console port */ | |
89 | struct hvc_struct *hvc; | |
90 | ||
9778829c AS |
91 | /* The size of the console */ |
92 | struct winsize ws; | |
93 | ||
4f23c573 AS |
94 | /* |
95 | * This number identifies the number that we used to register | |
96 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
97 | * number passed on by the hvc callbacks to us to | |
98 | * differentiate between the other console ports handled by | |
99 | * this driver | |
100 | */ | |
101 | u32 vtermno; | |
102 | }; | |
103 | ||
fdb9a054 AS |
104 | struct port_buffer { |
105 | char *buf; | |
106 | ||
107 | /* size of the buffer in *buf above */ | |
108 | size_t size; | |
109 | ||
110 | /* used length of the buffer */ | |
111 | size_t len; | |
112 | /* offset in the buf from which to consume data */ | |
113 | size_t offset; | |
114 | }; | |
115 | ||
17634ba2 AS |
116 | /* |
117 | * This is a per-device struct that stores data common to all the | |
118 | * ports for that device (vdev->priv). | |
119 | */ | |
120 | struct ports_device { | |
6bdf2afd AS |
121 | /* Next portdev in the list, head is in the pdrvdata struct */ |
122 | struct list_head list; | |
123 | ||
17634ba2 AS |
124 | /* |
125 | * Workqueue handlers where we process deferred work after | |
126 | * notification | |
127 | */ | |
128 | struct work_struct control_work; | |
129 | ||
130 | struct list_head ports; | |
131 | ||
132 | /* To protect the list of ports */ | |
133 | spinlock_t ports_lock; | |
134 | ||
135 | /* To protect the vq operations for the control channel */ | |
136 | spinlock_t cvq_lock; | |
137 | ||
138 | /* The current config space is stored here */ | |
b99fa815 | 139 | struct virtio_console_config config; |
17634ba2 AS |
140 | |
141 | /* The virtio device we're associated with */ | |
142 | struct virtio_device *vdev; | |
143 | ||
144 | /* | |
145 | * A couple of virtqueues for the control channel: one for | |
146 | * guest->host transfers, one for host->guest transfers | |
147 | */ | |
148 | struct virtqueue *c_ivq, *c_ovq; | |
149 | ||
150 | /* Array of per-port IO virtqueues */ | |
151 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
152 | |
153 | /* Used for numbering devices for sysfs and debugfs */ | |
154 | unsigned int drv_index; | |
155 | ||
156 | /* Major number for this device. Ports will be created as minors. */ | |
157 | int chr_major; | |
17634ba2 AS |
158 | }; |
159 | ||
17e5b4f2 AS |
160 | struct port_stats { |
161 | unsigned long bytes_sent, bytes_received, bytes_discarded; | |
162 | }; | |
163 | ||
1c85bf35 | 164 | /* This struct holds the per-port data */ |
21206ede | 165 | struct port { |
17634ba2 AS |
166 | /* Next port in the list, head is in the ports_device */ |
167 | struct list_head list; | |
168 | ||
1c85bf35 AS |
169 | /* Pointer to the parent virtio_console device */ |
170 | struct ports_device *portdev; | |
fdb9a054 AS |
171 | |
172 | /* The current buffer from which data has to be fed to readers */ | |
173 | struct port_buffer *inbuf; | |
21206ede | 174 | |
203baab8 AS |
175 | /* |
176 | * To protect the operations on the in_vq associated with this | |
177 | * port. Has to be a spinlock because it can be called from | |
178 | * interrupt context (get_char()). | |
179 | */ | |
180 | spinlock_t inbuf_lock; | |
181 | ||
cdfadfc1 AS |
182 | /* Protect the operations on the out_vq. */ |
183 | spinlock_t outvq_lock; | |
184 | ||
1c85bf35 AS |
185 | /* The IO vqs for this port */ |
186 | struct virtqueue *in_vq, *out_vq; | |
187 | ||
d99393ef AS |
188 | /* File in the debugfs directory that exposes this port's information */ |
189 | struct dentry *debugfs_file; | |
190 | ||
17e5b4f2 AS |
191 | /* |
192 | * Keep count of the bytes sent, received and discarded for | |
193 | * this port for accounting and debugging purposes. These | |
194 | * counts are not reset across port open / close events. | |
195 | */ | |
196 | struct port_stats stats; | |
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 | 204 | /* Each port associates with a separate char device */ |
d22a6989 | 205 | struct cdev *cdev; |
fb08bd27 AS |
206 | struct device *dev; |
207 | ||
b353a6b8 AS |
208 | /* Reference-counting to handle port hot-unplugs and file operations */ |
209 | struct kref kref; | |
210 | ||
2030fa49 AS |
211 | /* A waitqueue for poll() or blocking read operations */ |
212 | wait_queue_head_t waitqueue; | |
213 | ||
431edb8a AS |
214 | /* The 'name' of the port that we expose via sysfs properties */ |
215 | char *name; | |
216 | ||
3eae0ade AS |
217 | /* We can notify apps of host connect / disconnect events via SIGIO */ |
218 | struct fasync_struct *async_queue; | |
219 | ||
17634ba2 AS |
220 | /* The 'id' to identify the port with the Host */ |
221 | u32 id; | |
2030fa49 | 222 | |
cdfadfc1 AS |
223 | bool outvq_full; |
224 | ||
2030fa49 AS |
225 | /* Is the host device open */ |
226 | bool host_connected; | |
3c7969cc AS |
227 | |
228 | /* We should allow only one process to open a port */ | |
229 | bool guest_connected; | |
21206ede | 230 | }; |
31610434 | 231 | |
971f3390 RR |
232 | /* This is the very early arch-specified put chars function. */ |
233 | static int (*early_put_chars)(u32, const char *, int); | |
234 | ||
38edf58d AS |
235 | static struct port *find_port_by_vtermno(u32 vtermno) |
236 | { | |
237 | struct port *port; | |
4f23c573 | 238 | struct console *cons; |
38edf58d AS |
239 | unsigned long flags; |
240 | ||
241 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
242 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
243 | if (cons->vtermno == vtermno) { | |
244 | port = container_of(cons, struct port, cons); | |
38edf58d | 245 | goto out; |
4f23c573 | 246 | } |
38edf58d AS |
247 | } |
248 | port = NULL; | |
249 | out: | |
250 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
251 | return port; | |
252 | } | |
253 | ||
04950cdf AS |
254 | static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, |
255 | dev_t dev) | |
256 | { | |
257 | struct port *port; | |
258 | unsigned long flags; | |
259 | ||
260 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
261 | list_for_each_entry(port, &portdev->ports, list) | |
d22a6989 | 262 | if (port->cdev->dev == dev) |
04950cdf AS |
263 | goto out; |
264 | port = NULL; | |
265 | out: | |
266 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
267 | ||
268 | return port; | |
269 | } | |
270 | ||
271 | static struct port *find_port_by_devt(dev_t dev) | |
272 | { | |
273 | struct ports_device *portdev; | |
274 | struct port *port; | |
275 | unsigned long flags; | |
276 | ||
277 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
278 | list_for_each_entry(portdev, &pdrvdata.portdevs, list) { | |
279 | port = find_port_by_devt_in_portdev(portdev, dev); | |
280 | if (port) | |
281 | goto out; | |
282 | } | |
283 | port = NULL; | |
284 | out: | |
285 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
286 | return port; | |
287 | } | |
288 | ||
17634ba2 AS |
289 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
290 | { | |
291 | struct port *port; | |
292 | unsigned long flags; | |
293 | ||
294 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
295 | list_for_each_entry(port, &portdev->ports, list) | |
296 | if (port->id == id) | |
297 | goto out; | |
298 | port = NULL; | |
299 | out: | |
300 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
301 | ||
302 | return port; | |
303 | } | |
304 | ||
203baab8 AS |
305 | static struct port *find_port_by_vq(struct ports_device *portdev, |
306 | struct virtqueue *vq) | |
307 | { | |
308 | struct port *port; | |
203baab8 AS |
309 | unsigned long flags; |
310 | ||
17634ba2 AS |
311 | spin_lock_irqsave(&portdev->ports_lock, flags); |
312 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
313 | if (port->in_vq == vq || port->out_vq == vq) |
314 | goto out; | |
203baab8 AS |
315 | port = NULL; |
316 | out: | |
17634ba2 | 317 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
318 | return port; |
319 | } | |
320 | ||
17634ba2 AS |
321 | static bool is_console_port(struct port *port) |
322 | { | |
323 | if (port->cons.hvc) | |
324 | return true; | |
325 | return false; | |
326 | } | |
327 | ||
328 | static inline bool use_multiport(struct ports_device *portdev) | |
329 | { | |
330 | /* | |
331 | * This condition can be true when put_chars is called from | |
332 | * early_init | |
333 | */ | |
334 | if (!portdev->vdev) | |
335 | return 0; | |
336 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
337 | } | |
338 | ||
fdb9a054 AS |
339 | static void free_buf(struct port_buffer *buf) |
340 | { | |
341 | kfree(buf->buf); | |
342 | kfree(buf); | |
343 | } | |
344 | ||
345 | static struct port_buffer *alloc_buf(size_t buf_size) | |
346 | { | |
347 | struct port_buffer *buf; | |
348 | ||
349 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
350 | if (!buf) | |
351 | goto fail; | |
352 | buf->buf = kzalloc(buf_size, GFP_KERNEL); | |
353 | if (!buf->buf) | |
354 | goto free_buf; | |
355 | buf->len = 0; | |
356 | buf->offset = 0; | |
357 | buf->size = buf_size; | |
358 | return buf; | |
359 | ||
360 | free_buf: | |
361 | kfree(buf); | |
362 | fail: | |
363 | return NULL; | |
364 | } | |
365 | ||
a3cde449 | 366 | /* Callers should take appropriate locks */ |
defde669 | 367 | static struct port_buffer *get_inbuf(struct port *port) |
a3cde449 AS |
368 | { |
369 | struct port_buffer *buf; | |
a3cde449 AS |
370 | unsigned int len; |
371 | ||
d25a9dda AS |
372 | if (port->inbuf) |
373 | return port->inbuf; | |
374 | ||
375 | buf = virtqueue_get_buf(port->in_vq, &len); | |
a3cde449 AS |
376 | if (buf) { |
377 | buf->len = len; | |
378 | buf->offset = 0; | |
17e5b4f2 | 379 | port->stats.bytes_received += len; |
a3cde449 AS |
380 | } |
381 | return buf; | |
382 | } | |
383 | ||
e27b5198 AS |
384 | /* |
385 | * Create a scatter-gather list representing our input buffer and put | |
386 | * it in the queue. | |
387 | * | |
388 | * Callers should take appropriate locks. | |
389 | */ | |
203baab8 | 390 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
391 | { |
392 | struct scatterlist sg[1]; | |
203baab8 | 393 | int ret; |
1c85bf35 | 394 | |
e27b5198 AS |
395 | sg_init_one(sg, buf->buf, buf->size); |
396 | ||
f96fde41 | 397 | ret = virtqueue_add_buf(vq, sg, 0, 1, buf, GFP_ATOMIC); |
505b0451 | 398 | virtqueue_kick(vq); |
203baab8 AS |
399 | return ret; |
400 | } | |
401 | ||
88f251ac AS |
402 | /* Discard any unread data this port has. Callers lockers. */ |
403 | static void discard_port_data(struct port *port) | |
404 | { | |
405 | struct port_buffer *buf; | |
2d24cdaa | 406 | unsigned int err; |
88f251ac | 407 | |
d7a62cd0 AS |
408 | if (!port->portdev) { |
409 | /* Device has been unplugged. vqs are already gone. */ | |
410 | return; | |
411 | } | |
2d24cdaa | 412 | buf = get_inbuf(port); |
88f251ac | 413 | |
ce072a0c | 414 | err = 0; |
d6933561 | 415 | while (buf) { |
17e5b4f2 | 416 | port->stats.bytes_discarded += buf->len - buf->offset; |
2d24cdaa | 417 | if (add_inbuf(port->in_vq, buf) < 0) { |
ce072a0c | 418 | err++; |
d6933561 AS |
419 | free_buf(buf); |
420 | } | |
2d24cdaa AS |
421 | port->inbuf = NULL; |
422 | buf = get_inbuf(port); | |
88f251ac | 423 | } |
ce072a0c | 424 | if (err) |
d6933561 | 425 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", |
ce072a0c | 426 | err); |
88f251ac AS |
427 | } |
428 | ||
203baab8 AS |
429 | static bool port_has_data(struct port *port) |
430 | { | |
431 | unsigned long flags; | |
432 | bool ret; | |
433 | ||
d25a9dda | 434 | ret = false; |
203baab8 | 435 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 436 | port->inbuf = get_inbuf(port); |
d25a9dda | 437 | if (port->inbuf) |
d6933561 | 438 | ret = true; |
d25a9dda | 439 | |
203baab8 | 440 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
441 | return ret; |
442 | } | |
443 | ||
3425e706 AS |
444 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
445 | unsigned int event, unsigned int value) | |
17634ba2 AS |
446 | { |
447 | struct scatterlist sg[1]; | |
448 | struct virtio_console_control cpkt; | |
449 | struct virtqueue *vq; | |
604b2ad7 | 450 | unsigned int len; |
17634ba2 | 451 | |
3425e706 | 452 | if (!use_multiport(portdev)) |
17634ba2 AS |
453 | return 0; |
454 | ||
3425e706 | 455 | cpkt.id = port_id; |
17634ba2 AS |
456 | cpkt.event = event; |
457 | cpkt.value = value; | |
458 | ||
3425e706 | 459 | vq = portdev->c_ovq; |
17634ba2 AS |
460 | |
461 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
f96fde41 | 462 | if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt, GFP_ATOMIC) >= 0) { |
505b0451 MT |
463 | virtqueue_kick(vq); |
464 | while (!virtqueue_get_buf(vq, &len)) | |
17634ba2 AS |
465 | cpu_relax(); |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
3425e706 AS |
470 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
471 | unsigned int value) | |
472 | { | |
84ec06c5 AS |
473 | /* Did the port get unplugged before userspace closed it? */ |
474 | if (port->portdev) | |
475 | return __send_control_msg(port->portdev, port->id, event, value); | |
476 | return 0; | |
3425e706 AS |
477 | } |
478 | ||
eb5e89fc MH |
479 | struct buffer_token { |
480 | union { | |
481 | void *buf; | |
482 | struct scatterlist *sg; | |
483 | } u; | |
8ca84a50 MH |
484 | /* If sgpages == 0 then buf is used, else sg is used */ |
485 | unsigned int sgpages; | |
eb5e89fc MH |
486 | }; |
487 | ||
8ca84a50 | 488 | static void reclaim_sg_pages(struct scatterlist *sg, unsigned int nrpages) |
eb5e89fc MH |
489 | { |
490 | int i; | |
491 | struct page *page; | |
492 | ||
8ca84a50 | 493 | for (i = 0; i < nrpages; i++) { |
eb5e89fc MH |
494 | page = sg_page(&sg[i]); |
495 | if (!page) | |
496 | break; | |
497 | put_page(page); | |
498 | } | |
499 | kfree(sg); | |
500 | } | |
501 | ||
cdfadfc1 AS |
502 | /* Callers must take the port->outvq_lock */ |
503 | static void reclaim_consumed_buffers(struct port *port) | |
504 | { | |
eb5e89fc | 505 | struct buffer_token *tok; |
cdfadfc1 AS |
506 | unsigned int len; |
507 | ||
d7a62cd0 AS |
508 | if (!port->portdev) { |
509 | /* Device has been unplugged. vqs are already gone. */ | |
510 | return; | |
511 | } | |
eb5e89fc MH |
512 | while ((tok = virtqueue_get_buf(port->out_vq, &len))) { |
513 | if (tok->sgpages) | |
8ca84a50 | 514 | reclaim_sg_pages(tok->u.sg, tok->sgpages); |
eb5e89fc MH |
515 | else |
516 | kfree(tok->u.buf); | |
517 | kfree(tok); | |
cdfadfc1 AS |
518 | port->outvq_full = false; |
519 | } | |
520 | } | |
521 | ||
eb5e89fc MH |
522 | static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, |
523 | int nents, size_t in_count, | |
524 | struct buffer_token *tok, bool nonblock) | |
f997f00b | 525 | { |
f997f00b AS |
526 | struct virtqueue *out_vq; |
527 | ssize_t ret; | |
cdfadfc1 | 528 | unsigned long flags; |
f997f00b AS |
529 | unsigned int len; |
530 | ||
531 | out_vq = port->out_vq; | |
532 | ||
cdfadfc1 AS |
533 | spin_lock_irqsave(&port->outvq_lock, flags); |
534 | ||
535 | reclaim_consumed_buffers(port); | |
536 | ||
eb5e89fc | 537 | ret = virtqueue_add_buf(out_vq, sg, nents, 0, tok, GFP_ATOMIC); |
f997f00b AS |
538 | |
539 | /* Tell Host to go! */ | |
505b0451 | 540 | virtqueue_kick(out_vq); |
f997f00b AS |
541 | |
542 | if (ret < 0) { | |
9ff4cfab | 543 | in_count = 0; |
cdfadfc1 | 544 | goto done; |
f997f00b AS |
545 | } |
546 | ||
cdfadfc1 AS |
547 | if (ret == 0) |
548 | port->outvq_full = true; | |
549 | ||
550 | if (nonblock) | |
551 | goto done; | |
552 | ||
553 | /* | |
554 | * Wait till the host acknowledges it pushed out the data we | |
531295e6 AS |
555 | * sent. This is done for data from the hvc_console; the tty |
556 | * operations are performed with spinlocks held so we can't | |
557 | * sleep here. An alternative would be to copy the data to a | |
558 | * buffer and relax the spinning requirement. The downside is | |
559 | * we need to kmalloc a GFP_ATOMIC buffer each time the | |
560 | * console driver writes something out. | |
cdfadfc1 | 561 | */ |
505b0451 | 562 | while (!virtqueue_get_buf(out_vq, &len)) |
f997f00b | 563 | cpu_relax(); |
cdfadfc1 AS |
564 | done: |
565 | spin_unlock_irqrestore(&port->outvq_lock, flags); | |
17e5b4f2 AS |
566 | |
567 | port->stats.bytes_sent += in_count; | |
cdfadfc1 AS |
568 | /* |
569 | * We're expected to return the amount of data we wrote -- all | |
570 | * of it | |
571 | */ | |
9ff4cfab | 572 | return in_count; |
f997f00b AS |
573 | } |
574 | ||
eb5e89fc MH |
575 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count, |
576 | bool nonblock) | |
577 | { | |
578 | struct scatterlist sg[1]; | |
579 | struct buffer_token *tok; | |
580 | ||
581 | tok = kmalloc(sizeof(*tok), GFP_ATOMIC); | |
582 | if (!tok) | |
583 | return -ENOMEM; | |
8ca84a50 | 584 | tok->sgpages = 0; |
eb5e89fc MH |
585 | tok->u.buf = in_buf; |
586 | ||
587 | sg_init_one(sg, in_buf, in_count); | |
588 | ||
589 | return __send_to_port(port, sg, 1, in_count, tok, nonblock); | |
590 | } | |
591 | ||
592 | static ssize_t send_pages(struct port *port, struct scatterlist *sg, int nents, | |
593 | size_t in_count, bool nonblock) | |
594 | { | |
595 | struct buffer_token *tok; | |
596 | ||
597 | tok = kmalloc(sizeof(*tok), GFP_ATOMIC); | |
598 | if (!tok) | |
599 | return -ENOMEM; | |
8ca84a50 | 600 | tok->sgpages = nents; |
eb5e89fc MH |
601 | tok->u.sg = sg; |
602 | ||
603 | return __send_to_port(port, sg, nents, in_count, tok, nonblock); | |
604 | } | |
605 | ||
203baab8 AS |
606 | /* |
607 | * Give out the data that's requested from the buffer that we have | |
608 | * queued up. | |
609 | */ | |
b766ceed AS |
610 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
611 | bool to_user) | |
203baab8 AS |
612 | { |
613 | struct port_buffer *buf; | |
614 | unsigned long flags; | |
615 | ||
616 | if (!out_count || !port_has_data(port)) | |
617 | return 0; | |
618 | ||
619 | buf = port->inbuf; | |
b766ceed | 620 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 621 | |
b766ceed AS |
622 | if (to_user) { |
623 | ssize_t ret; | |
624 | ||
625 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
626 | if (ret) | |
627 | return -EFAULT; | |
628 | } else { | |
629 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
630 | } | |
203baab8 | 631 | |
203baab8 AS |
632 | buf->offset += out_count; |
633 | ||
634 | if (buf->offset == buf->len) { | |
635 | /* | |
636 | * We're done using all the data in this buffer. | |
637 | * Re-queue so that the Host can send us more data. | |
638 | */ | |
639 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
640 | port->inbuf = NULL; | |
641 | ||
642 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 643 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
644 | |
645 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
646 | } | |
b766ceed | 647 | /* Return the number of bytes actually copied */ |
203baab8 | 648 | return out_count; |
e27b5198 AS |
649 | } |
650 | ||
2030fa49 | 651 | /* The condition that must be true for polling to end */ |
60caacd3 | 652 | static bool will_read_block(struct port *port) |
2030fa49 | 653 | { |
3709ea7a AS |
654 | if (!port->guest_connected) { |
655 | /* Port got hot-unplugged. Let's exit. */ | |
656 | return false; | |
657 | } | |
60caacd3 | 658 | return !port_has_data(port) && port->host_connected; |
2030fa49 AS |
659 | } |
660 | ||
cdfadfc1 AS |
661 | static bool will_write_block(struct port *port) |
662 | { | |
663 | bool ret; | |
664 | ||
60e5e0b8 AS |
665 | if (!port->guest_connected) { |
666 | /* Port got hot-unplugged. Let's exit. */ | |
667 | return false; | |
668 | } | |
cdfadfc1 AS |
669 | if (!port->host_connected) |
670 | return true; | |
671 | ||
672 | spin_lock_irq(&port->outvq_lock); | |
673 | /* | |
674 | * Check if the Host has consumed any buffers since we last | |
675 | * sent data (this is only applicable for nonblocking ports). | |
676 | */ | |
677 | reclaim_consumed_buffers(port); | |
678 | ret = port->outvq_full; | |
679 | spin_unlock_irq(&port->outvq_lock); | |
680 | ||
681 | return ret; | |
682 | } | |
683 | ||
2030fa49 AS |
684 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, |
685 | size_t count, loff_t *offp) | |
686 | { | |
687 | struct port *port; | |
688 | ssize_t ret; | |
689 | ||
690 | port = filp->private_data; | |
691 | ||
692 | if (!port_has_data(port)) { | |
693 | /* | |
694 | * If nothing's connected on the host just return 0 in | |
695 | * case of list_empty; this tells the userspace app | |
696 | * that there's no connection | |
697 | */ | |
698 | if (!port->host_connected) | |
699 | return 0; | |
700 | if (filp->f_flags & O_NONBLOCK) | |
701 | return -EAGAIN; | |
702 | ||
a08fa92d AS |
703 | ret = wait_event_freezable(port->waitqueue, |
704 | !will_read_block(port)); | |
2030fa49 AS |
705 | if (ret < 0) |
706 | return ret; | |
707 | } | |
b3dddb9e AS |
708 | /* Port got hot-unplugged. */ |
709 | if (!port->guest_connected) | |
710 | return -ENODEV; | |
2030fa49 AS |
711 | /* |
712 | * We could've received a disconnection message while we were | |
713 | * waiting for more data. | |
714 | * | |
715 | * This check is not clubbed in the if() statement above as we | |
716 | * might receive some data as well as the host could get | |
717 | * disconnected after we got woken up from our wait. So we | |
718 | * really want to give off whatever data we have and only then | |
719 | * check for host_connected. | |
720 | */ | |
721 | if (!port_has_data(port) && !port->host_connected) | |
722 | return 0; | |
723 | ||
724 | return fill_readbuf(port, ubuf, count, true); | |
725 | } | |
726 | ||
efe75d24 MH |
727 | static int wait_port_writable(struct port *port, bool nonblock) |
728 | { | |
729 | int ret; | |
730 | ||
731 | if (will_write_block(port)) { | |
732 | if (nonblock) | |
733 | return -EAGAIN; | |
734 | ||
735 | ret = wait_event_freezable(port->waitqueue, | |
736 | !will_write_block(port)); | |
737 | if (ret < 0) | |
738 | return ret; | |
739 | } | |
740 | /* Port got hot-unplugged. */ | |
741 | if (!port->guest_connected) | |
742 | return -ENODEV; | |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
2030fa49 AS |
747 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, |
748 | size_t count, loff_t *offp) | |
749 | { | |
750 | struct port *port; | |
751 | char *buf; | |
752 | ssize_t ret; | |
cdfadfc1 | 753 | bool nonblock; |
2030fa49 | 754 | |
65745422 AS |
755 | /* Userspace could be out to fool us */ |
756 | if (!count) | |
757 | return 0; | |
758 | ||
2030fa49 AS |
759 | port = filp->private_data; |
760 | ||
cdfadfc1 AS |
761 | nonblock = filp->f_flags & O_NONBLOCK; |
762 | ||
efe75d24 MH |
763 | ret = wait_port_writable(port, nonblock); |
764 | if (ret < 0) | |
765 | return ret; | |
cdfadfc1 | 766 | |
2030fa49 AS |
767 | count = min((size_t)(32 * 1024), count); |
768 | ||
769 | buf = kmalloc(count, GFP_KERNEL); | |
770 | if (!buf) | |
771 | return -ENOMEM; | |
772 | ||
773 | ret = copy_from_user(buf, ubuf, count); | |
774 | if (ret) { | |
775 | ret = -EFAULT; | |
776 | goto free_buf; | |
777 | } | |
778 | ||
531295e6 AS |
779 | /* |
780 | * We now ask send_buf() to not spin for generic ports -- we | |
781 | * can re-use the same code path that non-blocking file | |
782 | * descriptors take for blocking file descriptors since the | |
783 | * wait is already done and we're certain the write will go | |
784 | * through to the host. | |
785 | */ | |
786 | nonblock = true; | |
cdfadfc1 AS |
787 | ret = send_buf(port, buf, count, nonblock); |
788 | ||
789 | if (nonblock && ret > 0) | |
790 | goto out; | |
791 | ||
2030fa49 AS |
792 | free_buf: |
793 | kfree(buf); | |
cdfadfc1 | 794 | out: |
2030fa49 AS |
795 | return ret; |
796 | } | |
797 | ||
eb5e89fc MH |
798 | struct sg_list { |
799 | unsigned int n; | |
8ca84a50 | 800 | unsigned int size; |
eb5e89fc MH |
801 | size_t len; |
802 | struct scatterlist *sg; | |
803 | }; | |
804 | ||
805 | static int pipe_to_sg(struct pipe_inode_info *pipe, struct pipe_buffer *buf, | |
806 | struct splice_desc *sd) | |
807 | { | |
808 | struct sg_list *sgl = sd->u.data; | |
ec8fc870 | 809 | unsigned int offset, len; |
eb5e89fc | 810 | |
8ca84a50 | 811 | if (sgl->n == sgl->size) |
eb5e89fc MH |
812 | return 0; |
813 | ||
814 | /* Try lock this page */ | |
815 | if (buf->ops->steal(pipe, buf) == 0) { | |
816 | /* Get reference and unlock page for moving */ | |
817 | get_page(buf->page); | |
818 | unlock_page(buf->page); | |
819 | ||
820 | len = min(buf->len, sd->len); | |
821 | sg_set_page(&(sgl->sg[sgl->n]), buf->page, len, buf->offset); | |
ec8fc870 MH |
822 | } else { |
823 | /* Failback to copying a page */ | |
824 | struct page *page = alloc_page(GFP_KERNEL); | |
825 | char *src = buf->ops->map(pipe, buf, 1); | |
826 | char *dst; | |
827 | ||
828 | if (!page) | |
829 | return -ENOMEM; | |
830 | dst = kmap(page); | |
831 | ||
832 | offset = sd->pos & ~PAGE_MASK; | |
833 | ||
834 | len = sd->len; | |
835 | if (len + offset > PAGE_SIZE) | |
836 | len = PAGE_SIZE - offset; | |
837 | ||
838 | memcpy(dst + offset, src + buf->offset, len); | |
839 | ||
840 | kunmap(page); | |
841 | buf->ops->unmap(pipe, buf, src); | |
842 | ||
843 | sg_set_page(&(sgl->sg[sgl->n]), page, len, offset); | |
eb5e89fc | 844 | } |
ec8fc870 MH |
845 | sgl->n++; |
846 | sgl->len += len; | |
eb5e89fc MH |
847 | |
848 | return len; | |
849 | } | |
850 | ||
851 | /* Faster zero-copy write by splicing */ | |
852 | static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, | |
853 | struct file *filp, loff_t *ppos, | |
854 | size_t len, unsigned int flags) | |
855 | { | |
856 | struct port *port = filp->private_data; | |
857 | struct sg_list sgl; | |
858 | ssize_t ret; | |
859 | struct splice_desc sd = { | |
860 | .total_len = len, | |
861 | .flags = flags, | |
862 | .pos = *ppos, | |
863 | .u.data = &sgl, | |
864 | }; | |
865 | ||
efe75d24 MH |
866 | ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK); |
867 | if (ret < 0) | |
868 | return ret; | |
869 | ||
eb5e89fc MH |
870 | sgl.n = 0; |
871 | sgl.len = 0; | |
8ca84a50 MH |
872 | sgl.size = pipe->nrbufs; |
873 | sgl.sg = kmalloc(sizeof(struct scatterlist) * sgl.size, GFP_KERNEL); | |
eb5e89fc MH |
874 | if (unlikely(!sgl.sg)) |
875 | return -ENOMEM; | |
876 | ||
8ca84a50 | 877 | sg_init_table(sgl.sg, sgl.size); |
eb5e89fc MH |
878 | ret = __splice_from_pipe(pipe, &sd, pipe_to_sg); |
879 | if (likely(ret > 0)) | |
880 | ret = send_pages(port, sgl.sg, sgl.n, sgl.len, true); | |
881 | ||
882 | return ret; | |
883 | } | |
884 | ||
2030fa49 AS |
885 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) |
886 | { | |
887 | struct port *port; | |
888 | unsigned int ret; | |
889 | ||
890 | port = filp->private_data; | |
891 | poll_wait(filp, &port->waitqueue, wait); | |
892 | ||
8529a504 AS |
893 | if (!port->guest_connected) { |
894 | /* Port got unplugged */ | |
895 | return POLLHUP; | |
896 | } | |
2030fa49 | 897 | ret = 0; |
6df7aadc | 898 | if (!will_read_block(port)) |
2030fa49 | 899 | ret |= POLLIN | POLLRDNORM; |
cdfadfc1 | 900 | if (!will_write_block(port)) |
2030fa49 AS |
901 | ret |= POLLOUT; |
902 | if (!port->host_connected) | |
903 | ret |= POLLHUP; | |
904 | ||
905 | return ret; | |
906 | } | |
907 | ||
b353a6b8 AS |
908 | static void remove_port(struct kref *kref); |
909 | ||
2030fa49 AS |
910 | static int port_fops_release(struct inode *inode, struct file *filp) |
911 | { | |
912 | struct port *port; | |
913 | ||
914 | port = filp->private_data; | |
915 | ||
916 | /* Notify host of port being closed */ | |
917 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
918 | ||
88f251ac | 919 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
920 | port->guest_connected = false; |
921 | ||
88f251ac AS |
922 | discard_port_data(port); |
923 | ||
924 | spin_unlock_irq(&port->inbuf_lock); | |
925 | ||
cdfadfc1 AS |
926 | spin_lock_irq(&port->outvq_lock); |
927 | reclaim_consumed_buffers(port); | |
928 | spin_unlock_irq(&port->outvq_lock); | |
929 | ||
b353a6b8 AS |
930 | /* |
931 | * Locks aren't necessary here as a port can't be opened after | |
932 | * unplug, and if a port isn't unplugged, a kref would already | |
933 | * exist for the port. Plus, taking ports_lock here would | |
934 | * create a dependency on other locks taken by functions | |
935 | * inside remove_port if we're the last holder of the port, | |
936 | * creating many problems. | |
937 | */ | |
938 | kref_put(&port->kref, remove_port); | |
939 | ||
2030fa49 AS |
940 | return 0; |
941 | } | |
942 | ||
943 | static int port_fops_open(struct inode *inode, struct file *filp) | |
944 | { | |
945 | struct cdev *cdev = inode->i_cdev; | |
946 | struct port *port; | |
8ad37e83 | 947 | int ret; |
2030fa49 | 948 | |
04950cdf | 949 | port = find_port_by_devt(cdev->dev); |
2030fa49 AS |
950 | filp->private_data = port; |
951 | ||
b353a6b8 AS |
952 | /* Prevent against a port getting hot-unplugged at the same time */ |
953 | spin_lock_irq(&port->portdev->ports_lock); | |
954 | kref_get(&port->kref); | |
955 | spin_unlock_irq(&port->portdev->ports_lock); | |
956 | ||
2030fa49 AS |
957 | /* |
958 | * Don't allow opening of console port devices -- that's done | |
959 | * via /dev/hvc | |
960 | */ | |
8ad37e83 AS |
961 | if (is_console_port(port)) { |
962 | ret = -ENXIO; | |
963 | goto out; | |
964 | } | |
2030fa49 | 965 | |
3c7969cc AS |
966 | /* Allow only one process to open a particular port at a time */ |
967 | spin_lock_irq(&port->inbuf_lock); | |
968 | if (port->guest_connected) { | |
969 | spin_unlock_irq(&port->inbuf_lock); | |
8ad37e83 AS |
970 | ret = -EMFILE; |
971 | goto out; | |
3c7969cc AS |
972 | } |
973 | ||
974 | port->guest_connected = true; | |
975 | spin_unlock_irq(&port->inbuf_lock); | |
976 | ||
cdfadfc1 AS |
977 | spin_lock_irq(&port->outvq_lock); |
978 | /* | |
979 | * There might be a chance that we missed reclaiming a few | |
980 | * buffers in the window of the port getting previously closed | |
981 | * and opening now. | |
982 | */ | |
983 | reclaim_consumed_buffers(port); | |
984 | spin_unlock_irq(&port->outvq_lock); | |
985 | ||
299fb61c AS |
986 | nonseekable_open(inode, filp); |
987 | ||
2030fa49 AS |
988 | /* Notify host of port being opened */ |
989 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
990 | ||
991 | return 0; | |
8ad37e83 | 992 | out: |
b353a6b8 | 993 | kref_put(&port->kref, remove_port); |
8ad37e83 | 994 | return ret; |
2030fa49 AS |
995 | } |
996 | ||
3eae0ade AS |
997 | static int port_fops_fasync(int fd, struct file *filp, int mode) |
998 | { | |
999 | struct port *port; | |
1000 | ||
1001 | port = filp->private_data; | |
1002 | return fasync_helper(fd, filp, mode, &port->async_queue); | |
1003 | } | |
1004 | ||
2030fa49 AS |
1005 | /* |
1006 | * The file operations that we support: programs in the guest can open | |
1007 | * a console device, read from it, write to it, poll for data and | |
1008 | * close it. The devices are at | |
1009 | * /dev/vport<device number>p<port number> | |
1010 | */ | |
1011 | static const struct file_operations port_fops = { | |
1012 | .owner = THIS_MODULE, | |
1013 | .open = port_fops_open, | |
1014 | .read = port_fops_read, | |
1015 | .write = port_fops_write, | |
eb5e89fc | 1016 | .splice_write = port_fops_splice_write, |
2030fa49 AS |
1017 | .poll = port_fops_poll, |
1018 | .release = port_fops_release, | |
3eae0ade | 1019 | .fasync = port_fops_fasync, |
299fb61c | 1020 | .llseek = no_llseek, |
2030fa49 AS |
1021 | }; |
1022 | ||
a23ea924 RR |
1023 | /* |
1024 | * The put_chars() callback is pretty straightforward. | |
31610434 | 1025 | * |
a23ea924 RR |
1026 | * We turn the characters into a scatter-gather list, add it to the |
1027 | * output queue and then kick the Host. Then we sit here waiting for | |
1028 | * it to finish: inefficient in theory, but in practice | |
1029 | * implementations will do it immediately (lguest's Launcher does). | |
1030 | */ | |
31610434 RR |
1031 | static int put_chars(u32 vtermno, const char *buf, int count) |
1032 | { | |
21206ede | 1033 | struct port *port; |
38edf58d | 1034 | |
162a689a FD |
1035 | if (unlikely(early_put_chars)) |
1036 | return early_put_chars(vtermno, buf, count); | |
1037 | ||
38edf58d AS |
1038 | port = find_port_by_vtermno(vtermno); |
1039 | if (!port) | |
6dc69f97 | 1040 | return -EPIPE; |
31610434 | 1041 | |
cdfadfc1 | 1042 | return send_buf(port, (void *)buf, count, false); |
31610434 RR |
1043 | } |
1044 | ||
a23ea924 RR |
1045 | /* |
1046 | * get_chars() is the callback from the hvc_console infrastructure | |
1047 | * when an interrupt is received. | |
31610434 | 1048 | * |
203baab8 AS |
1049 | * We call out to fill_readbuf that gets us the required data from the |
1050 | * buffers that are queued up. | |
a23ea924 | 1051 | */ |
31610434 RR |
1052 | static int get_chars(u32 vtermno, char *buf, int count) |
1053 | { | |
21206ede RR |
1054 | struct port *port; |
1055 | ||
6dc69f97 AS |
1056 | /* If we've not set up the port yet, we have no input to give. */ |
1057 | if (unlikely(early_put_chars)) | |
1058 | return 0; | |
1059 | ||
38edf58d AS |
1060 | port = find_port_by_vtermno(vtermno); |
1061 | if (!port) | |
6dc69f97 | 1062 | return -EPIPE; |
21206ede | 1063 | |
31610434 | 1064 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 1065 | BUG_ON(!port->in_vq); |
31610434 | 1066 | |
b766ceed | 1067 | return fill_readbuf(port, buf, count, false); |
31610434 | 1068 | } |
31610434 | 1069 | |
cb06e367 | 1070 | static void resize_console(struct port *port) |
c2983458 | 1071 | { |
cb06e367 | 1072 | struct virtio_device *vdev; |
c2983458 | 1073 | |
2de16a49 | 1074 | /* The port could have been hot-unplugged */ |
9778829c | 1075 | if (!port || !is_console_port(port)) |
2de16a49 AS |
1076 | return; |
1077 | ||
cb06e367 | 1078 | vdev = port->portdev->vdev; |
9778829c AS |
1079 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) |
1080 | hvc_resize(port->cons.hvc, port->cons.ws); | |
c2983458 CB |
1081 | } |
1082 | ||
38edf58d | 1083 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
1084 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
1085 | { | |
38edf58d AS |
1086 | struct port *port; |
1087 | ||
1088 | port = find_port_by_vtermno(hp->vtermno); | |
1089 | if (!port) | |
1090 | return -EINVAL; | |
1091 | ||
91fcad19 | 1092 | hp->irq_requested = 1; |
cb06e367 | 1093 | resize_console(port); |
c2983458 | 1094 | |
91fcad19 CB |
1095 | return 0; |
1096 | } | |
1097 | ||
1098 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
1099 | { | |
1100 | hp->irq_requested = 0; | |
1101 | } | |
1102 | ||
17634ba2 | 1103 | /* The operations for console ports. */ |
1dff3996 | 1104 | static const struct hv_ops hv_ops = { |
971f3390 RR |
1105 | .get_chars = get_chars, |
1106 | .put_chars = put_chars, | |
1107 | .notifier_add = notifier_add_vio, | |
1108 | .notifier_del = notifier_del_vio, | |
1109 | .notifier_hangup = notifier_del_vio, | |
1110 | }; | |
1111 | ||
1112 | /* | |
1113 | * Console drivers are initialized very early so boot messages can go | |
1114 | * out, so we do things slightly differently from the generic virtio | |
1115 | * initialization of the net and block drivers. | |
1116 | * | |
1117 | * At this stage, the console is output-only. It's too early to set | |
1118 | * up a virtqueue, so we let the drivers do some boutique early-output | |
1119 | * thing. | |
1120 | */ | |
1121 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
1122 | { | |
1123 | early_put_chars = put_chars; | |
1124 | return hvc_instantiate(0, 0, &hv_ops); | |
1125 | } | |
1126 | ||
17634ba2 | 1127 | int init_port_console(struct port *port) |
cfa6d379 AS |
1128 | { |
1129 | int ret; | |
1130 | ||
1131 | /* | |
1132 | * The Host's telling us this port is a console port. Hook it | |
1133 | * up with an hvc console. | |
1134 | * | |
1135 | * To set up and manage our virtual console, we call | |
1136 | * hvc_alloc(). | |
1137 | * | |
1138 | * The first argument of hvc_alloc() is the virtual console | |
1139 | * number. The second argument is the parameter for the | |
1140 | * notification mechanism (like irq number). We currently | |
1141 | * leave this as zero, virtqueues have implicit notifications. | |
1142 | * | |
1143 | * The third argument is a "struct hv_ops" containing the | |
1144 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
1145 | * pointers. The final argument is the output buffer size: we | |
1146 | * can do any size, so we put PAGE_SIZE here. | |
1147 | */ | |
1148 | port->cons.vtermno = pdrvdata.next_vtermno; | |
1149 | ||
1150 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
1151 | if (IS_ERR(port->cons.hvc)) { | |
1152 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
1153 | dev_err(port->dev, |
1154 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
1155 | port->cons.hvc = NULL; |
1156 | return ret; | |
1157 | } | |
1158 | spin_lock_irq(&pdrvdata_lock); | |
1159 | pdrvdata.next_vtermno++; | |
1160 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
1161 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 1162 | port->guest_connected = true; |
cfa6d379 | 1163 | |
1d05160b AS |
1164 | /* |
1165 | * Start using the new console output if this is the first | |
1166 | * console to come up. | |
1167 | */ | |
1168 | if (early_put_chars) | |
1169 | early_put_chars = NULL; | |
1170 | ||
2030fa49 AS |
1171 | /* Notify host of port being opened */ |
1172 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1173 | ||
cfa6d379 AS |
1174 | return 0; |
1175 | } | |
1176 | ||
431edb8a AS |
1177 | static ssize_t show_port_name(struct device *dev, |
1178 | struct device_attribute *attr, char *buffer) | |
1179 | { | |
1180 | struct port *port; | |
1181 | ||
1182 | port = dev_get_drvdata(dev); | |
1183 | ||
1184 | return sprintf(buffer, "%s\n", port->name); | |
1185 | } | |
1186 | ||
1187 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
1188 | ||
1189 | static struct attribute *port_sysfs_entries[] = { | |
1190 | &dev_attr_name.attr, | |
1191 | NULL | |
1192 | }; | |
1193 | ||
1194 | static struct attribute_group port_attribute_group = { | |
1195 | .name = NULL, /* put in device directory */ | |
1196 | .attrs = port_sysfs_entries, | |
1197 | }; | |
1198 | ||
d99393ef AS |
1199 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, |
1200 | size_t count, loff_t *offp) | |
1201 | { | |
1202 | struct port *port; | |
1203 | char *buf; | |
1204 | ssize_t ret, out_offset, out_count; | |
1205 | ||
1206 | out_count = 1024; | |
1207 | buf = kmalloc(out_count, GFP_KERNEL); | |
1208 | if (!buf) | |
1209 | return -ENOMEM; | |
1210 | ||
1211 | port = filp->private_data; | |
1212 | out_offset = 0; | |
1213 | out_offset += snprintf(buf + out_offset, out_count, | |
1214 | "name: %s\n", port->name ? port->name : ""); | |
1215 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1216 | "guest_connected: %d\n", port->guest_connected); | |
1217 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1218 | "host_connected: %d\n", port->host_connected); | |
cdfadfc1 AS |
1219 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1220 | "outvq_full: %d\n", port->outvq_full); | |
17e5b4f2 AS |
1221 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1222 | "bytes_sent: %lu\n", port->stats.bytes_sent); | |
1223 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1224 | "bytes_received: %lu\n", | |
1225 | port->stats.bytes_received); | |
1226 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1227 | "bytes_discarded: %lu\n", | |
1228 | port->stats.bytes_discarded); | |
d99393ef AS |
1229 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1230 | "is_console: %s\n", | |
1231 | is_console_port(port) ? "yes" : "no"); | |
1232 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1233 | "console_vtermno: %u\n", port->cons.vtermno); | |
1234 | ||
1235 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
1236 | kfree(buf); | |
1237 | return ret; | |
1238 | } | |
1239 | ||
1240 | static const struct file_operations port_debugfs_ops = { | |
1241 | .owner = THIS_MODULE, | |
234e3405 | 1242 | .open = simple_open, |
d99393ef AS |
1243 | .read = debugfs_read, |
1244 | }; | |
1245 | ||
9778829c AS |
1246 | static void set_console_size(struct port *port, u16 rows, u16 cols) |
1247 | { | |
1248 | if (!port || !is_console_port(port)) | |
1249 | return; | |
1250 | ||
1251 | port->cons.ws.ws_row = rows; | |
1252 | port->cons.ws.ws_col = cols; | |
1253 | } | |
1254 | ||
c446f8fc AS |
1255 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
1256 | { | |
1257 | struct port_buffer *buf; | |
1258 | unsigned int nr_added_bufs; | |
1259 | int ret; | |
1260 | ||
1261 | nr_added_bufs = 0; | |
1262 | do { | |
1263 | buf = alloc_buf(PAGE_SIZE); | |
1264 | if (!buf) | |
1265 | break; | |
1266 | ||
1267 | spin_lock_irq(lock); | |
1268 | ret = add_inbuf(vq, buf); | |
1269 | if (ret < 0) { | |
1270 | spin_unlock_irq(lock); | |
1271 | free_buf(buf); | |
1272 | break; | |
1273 | } | |
1274 | nr_added_bufs++; | |
1275 | spin_unlock_irq(lock); | |
1276 | } while (ret > 0); | |
1277 | ||
1278 | return nr_added_bufs; | |
1279 | } | |
1280 | ||
3eae0ade AS |
1281 | static void send_sigio_to_port(struct port *port) |
1282 | { | |
1283 | if (port->async_queue && port->guest_connected) | |
1284 | kill_fasync(&port->async_queue, SIGIO, POLL_OUT); | |
1285 | } | |
1286 | ||
c446f8fc AS |
1287 | static int add_port(struct ports_device *portdev, u32 id) |
1288 | { | |
1289 | char debugfs_name[16]; | |
1290 | struct port *port; | |
1291 | struct port_buffer *buf; | |
1292 | dev_t devt; | |
1293 | unsigned int nr_added_bufs; | |
1294 | int err; | |
1295 | ||
1296 | port = kmalloc(sizeof(*port), GFP_KERNEL); | |
1297 | if (!port) { | |
1298 | err = -ENOMEM; | |
1299 | goto fail; | |
1300 | } | |
b353a6b8 | 1301 | kref_init(&port->kref); |
c446f8fc AS |
1302 | |
1303 | port->portdev = portdev; | |
1304 | port->id = id; | |
1305 | ||
1306 | port->name = NULL; | |
1307 | port->inbuf = NULL; | |
1308 | port->cons.hvc = NULL; | |
3eae0ade | 1309 | port->async_queue = NULL; |
c446f8fc | 1310 | |
9778829c AS |
1311 | port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
1312 | ||
c446f8fc | 1313 | port->host_connected = port->guest_connected = false; |
17e5b4f2 | 1314 | port->stats = (struct port_stats) { 0 }; |
c446f8fc | 1315 | |
cdfadfc1 AS |
1316 | port->outvq_full = false; |
1317 | ||
c446f8fc AS |
1318 | port->in_vq = portdev->in_vqs[port->id]; |
1319 | port->out_vq = portdev->out_vqs[port->id]; | |
1320 | ||
d22a6989 AS |
1321 | port->cdev = cdev_alloc(); |
1322 | if (!port->cdev) { | |
1323 | dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); | |
1324 | err = -ENOMEM; | |
1325 | goto free_port; | |
1326 | } | |
1327 | port->cdev->ops = &port_fops; | |
c446f8fc AS |
1328 | |
1329 | devt = MKDEV(portdev->chr_major, id); | |
d22a6989 | 1330 | err = cdev_add(port->cdev, devt, 1); |
c446f8fc AS |
1331 | if (err < 0) { |
1332 | dev_err(&port->portdev->vdev->dev, | |
1333 | "Error %d adding cdev for port %u\n", err, id); | |
d22a6989 | 1334 | goto free_cdev; |
c446f8fc AS |
1335 | } |
1336 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1337 | devt, port, "vport%up%u", | |
1338 | port->portdev->drv_index, id); | |
1339 | if (IS_ERR(port->dev)) { | |
1340 | err = PTR_ERR(port->dev); | |
1341 | dev_err(&port->portdev->vdev->dev, | |
1342 | "Error %d creating device for port %u\n", | |
1343 | err, id); | |
1344 | goto free_cdev; | |
1345 | } | |
1346 | ||
1347 | spin_lock_init(&port->inbuf_lock); | |
cdfadfc1 | 1348 | spin_lock_init(&port->outvq_lock); |
c446f8fc AS |
1349 | init_waitqueue_head(&port->waitqueue); |
1350 | ||
1351 | /* Fill the in_vq with buffers so the host can send us data. */ | |
1352 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); | |
1353 | if (!nr_added_bufs) { | |
1354 | dev_err(port->dev, "Error allocating inbufs\n"); | |
1355 | err = -ENOMEM; | |
1356 | goto free_device; | |
1357 | } | |
1358 | ||
1359 | /* | |
1360 | * If we're not using multiport support, this has to be a console port | |
1361 | */ | |
1362 | if (!use_multiport(port->portdev)) { | |
1363 | err = init_port_console(port); | |
1364 | if (err) | |
1365 | goto free_inbufs; | |
1366 | } | |
1367 | ||
1368 | spin_lock_irq(&portdev->ports_lock); | |
1369 | list_add_tail(&port->list, &port->portdev->ports); | |
1370 | spin_unlock_irq(&portdev->ports_lock); | |
1371 | ||
1372 | /* | |
1373 | * Tell the Host we're set so that it can send us various | |
1374 | * configuration parameters for this port (eg, port name, | |
1375 | * caching, whether this is a console port, etc.) | |
1376 | */ | |
1377 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
1378 | ||
1379 | if (pdrvdata.debugfs_dir) { | |
1380 | /* | |
1381 | * Finally, create the debugfs file that we can use to | |
1382 | * inspect a port's state at any time | |
1383 | */ | |
1384 | sprintf(debugfs_name, "vport%up%u", | |
1385 | port->portdev->drv_index, id); | |
1386 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, | |
1387 | pdrvdata.debugfs_dir, | |
1388 | port, | |
1389 | &port_debugfs_ops); | |
1390 | } | |
1391 | return 0; | |
1392 | ||
1393 | free_inbufs: | |
1394 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1395 | free_buf(buf); | |
1396 | free_device: | |
1397 | device_destroy(pdrvdata.class, port->dev->devt); | |
1398 | free_cdev: | |
d22a6989 | 1399 | cdev_del(port->cdev); |
c446f8fc AS |
1400 | free_port: |
1401 | kfree(port); | |
1402 | fail: | |
1403 | /* The host might want to notify management sw about port add failure */ | |
0643e4c6 | 1404 | __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
c446f8fc AS |
1405 | return err; |
1406 | } | |
1407 | ||
b353a6b8 AS |
1408 | /* No users remain, remove all port-specific data. */ |
1409 | static void remove_port(struct kref *kref) | |
1410 | { | |
1411 | struct port *port; | |
1412 | ||
1413 | port = container_of(kref, struct port, kref); | |
1414 | ||
1415 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); | |
1416 | device_destroy(pdrvdata.class, port->dev->devt); | |
1417 | cdev_del(port->cdev); | |
1418 | ||
1419 | kfree(port->name); | |
1420 | ||
1421 | debugfs_remove(port->debugfs_file); | |
1422 | ||
1423 | kfree(port); | |
1424 | } | |
1425 | ||
a0e2dbfc AS |
1426 | static void remove_port_data(struct port *port) |
1427 | { | |
1428 | struct port_buffer *buf; | |
1429 | ||
1430 | /* Remove unused data this port might have received. */ | |
1431 | discard_port_data(port); | |
1432 | ||
1433 | reclaim_consumed_buffers(port); | |
1434 | ||
1435 | /* Remove buffers we queued up for the Host to send us data in. */ | |
1436 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1437 | free_buf(buf); | |
1438 | } | |
1439 | ||
b353a6b8 AS |
1440 | /* |
1441 | * Port got unplugged. Remove port from portdev's list and drop the | |
1442 | * kref reference. If no userspace has this port opened, it will | |
1443 | * result in immediate removal the port. | |
1444 | */ | |
1445 | static void unplug_port(struct port *port) | |
1f7aa42d | 1446 | { |
b353a6b8 AS |
1447 | spin_lock_irq(&port->portdev->ports_lock); |
1448 | list_del(&port->list); | |
1449 | spin_unlock_irq(&port->portdev->ports_lock); | |
1450 | ||
0047634d AS |
1451 | if (port->guest_connected) { |
1452 | port->guest_connected = false; | |
1453 | port->host_connected = false; | |
1454 | wake_up_interruptible(&port->waitqueue); | |
a461e11e AS |
1455 | |
1456 | /* Let the app know the port is going down. */ | |
1457 | send_sigio_to_port(port); | |
0047634d AS |
1458 | } |
1459 | ||
1f7aa42d AS |
1460 | if (is_console_port(port)) { |
1461 | spin_lock_irq(&pdrvdata_lock); | |
1462 | list_del(&port->cons.list); | |
1463 | spin_unlock_irq(&pdrvdata_lock); | |
1464 | hvc_remove(port->cons.hvc); | |
1465 | } | |
1f7aa42d | 1466 | |
a0e2dbfc | 1467 | remove_port_data(port); |
a9cdd485 | 1468 | |
b353a6b8 AS |
1469 | /* |
1470 | * We should just assume the device itself has gone off -- | |
1471 | * else a close on an open port later will try to send out a | |
1472 | * control message. | |
1473 | */ | |
1474 | port->portdev = NULL; | |
d99393ef | 1475 | |
b353a6b8 AS |
1476 | /* |
1477 | * Locks around here are not necessary - a port can't be | |
1478 | * opened after we removed the port struct from ports_list | |
1479 | * above. | |
1480 | */ | |
1481 | kref_put(&port->kref, remove_port); | |
1f7aa42d AS |
1482 | } |
1483 | ||
17634ba2 AS |
1484 | /* Any private messages that the Host and Guest want to share */ |
1485 | static void handle_control_message(struct ports_device *portdev, | |
1486 | struct port_buffer *buf) | |
1487 | { | |
1488 | struct virtio_console_control *cpkt; | |
1489 | struct port *port; | |
431edb8a AS |
1490 | size_t name_size; |
1491 | int err; | |
17634ba2 AS |
1492 | |
1493 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
1494 | ||
1495 | port = find_port_by_id(portdev, cpkt->id); | |
f909f850 | 1496 | if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) { |
17634ba2 AS |
1497 | /* No valid header at start of buffer. Drop it. */ |
1498 | dev_dbg(&portdev->vdev->dev, | |
1499 | "Invalid index %u in control packet\n", cpkt->id); | |
1500 | return; | |
1501 | } | |
1502 | ||
1503 | switch (cpkt->event) { | |
f909f850 AS |
1504 | case VIRTIO_CONSOLE_PORT_ADD: |
1505 | if (port) { | |
1d05160b AS |
1506 | dev_dbg(&portdev->vdev->dev, |
1507 | "Port %u already added\n", port->id); | |
f909f850 AS |
1508 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
1509 | break; | |
1510 | } | |
1511 | if (cpkt->id >= portdev->config.max_nr_ports) { | |
1512 | dev_warn(&portdev->vdev->dev, | |
1513 | "Request for adding port with out-of-bound id %u, max. supported id: %u\n", | |
1514 | cpkt->id, portdev->config.max_nr_ports - 1); | |
1515 | break; | |
1516 | } | |
1517 | add_port(portdev, cpkt->id); | |
1518 | break; | |
1519 | case VIRTIO_CONSOLE_PORT_REMOVE: | |
b353a6b8 | 1520 | unplug_port(port); |
f909f850 | 1521 | break; |
17634ba2 AS |
1522 | case VIRTIO_CONSOLE_CONSOLE_PORT: |
1523 | if (!cpkt->value) | |
1524 | break; | |
1525 | if (is_console_port(port)) | |
1526 | break; | |
1527 | ||
1528 | init_port_console(port); | |
5e38483b | 1529 | complete(&early_console_added); |
17634ba2 AS |
1530 | /* |
1531 | * Could remove the port here in case init fails - but | |
1532 | * have to notify the host first. | |
1533 | */ | |
1534 | break; | |
8345adbf AS |
1535 | case VIRTIO_CONSOLE_RESIZE: { |
1536 | struct { | |
1537 | __u16 rows; | |
1538 | __u16 cols; | |
1539 | } size; | |
1540 | ||
17634ba2 AS |
1541 | if (!is_console_port(port)) |
1542 | break; | |
8345adbf AS |
1543 | |
1544 | memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), | |
1545 | sizeof(size)); | |
1546 | set_console_size(port, size.rows, size.cols); | |
1547 | ||
17634ba2 AS |
1548 | port->cons.hvc->irq_requested = 1; |
1549 | resize_console(port); | |
1550 | break; | |
8345adbf | 1551 | } |
2030fa49 AS |
1552 | case VIRTIO_CONSOLE_PORT_OPEN: |
1553 | port->host_connected = cpkt->value; | |
1554 | wake_up_interruptible(&port->waitqueue); | |
cdfadfc1 AS |
1555 | /* |
1556 | * If the host port got closed and the host had any | |
1557 | * unconsumed buffers, we'll be able to reclaim them | |
1558 | * now. | |
1559 | */ | |
1560 | spin_lock_irq(&port->outvq_lock); | |
1561 | reclaim_consumed_buffers(port); | |
1562 | spin_unlock_irq(&port->outvq_lock); | |
3eae0ade AS |
1563 | |
1564 | /* | |
1565 | * If the guest is connected, it'll be interested in | |
1566 | * knowing the host connection state changed. | |
1567 | */ | |
1568 | send_sigio_to_port(port); | |
2030fa49 | 1569 | break; |
431edb8a | 1570 | case VIRTIO_CONSOLE_PORT_NAME: |
291024ef AS |
1571 | /* |
1572 | * If we woke up after hibernation, we can get this | |
1573 | * again. Skip it in that case. | |
1574 | */ | |
1575 | if (port->name) | |
1576 | break; | |
1577 | ||
431edb8a AS |
1578 | /* |
1579 | * Skip the size of the header and the cpkt to get the size | |
1580 | * of the name that was sent | |
1581 | */ | |
1582 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
1583 | ||
1584 | port->name = kmalloc(name_size, GFP_KERNEL); | |
1585 | if (!port->name) { | |
1586 | dev_err(port->dev, | |
1587 | "Not enough space to store port name\n"); | |
1588 | break; | |
1589 | } | |
1590 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
1591 | name_size - 1); | |
1592 | port->name[name_size - 1] = 0; | |
1593 | ||
1594 | /* | |
1595 | * Since we only have one sysfs attribute, 'name', | |
1596 | * create it only if we have a name for the port. | |
1597 | */ | |
1598 | err = sysfs_create_group(&port->dev->kobj, | |
1599 | &port_attribute_group); | |
ec64213c | 1600 | if (err) { |
431edb8a AS |
1601 | dev_err(port->dev, |
1602 | "Error %d creating sysfs device attributes\n", | |
1603 | err); | |
ec64213c AS |
1604 | } else { |
1605 | /* | |
1606 | * Generate a udev event so that appropriate | |
1607 | * symlinks can be created based on udev | |
1608 | * rules. | |
1609 | */ | |
1610 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
1611 | } | |
431edb8a | 1612 | break; |
17634ba2 AS |
1613 | } |
1614 | } | |
1615 | ||
1616 | static void control_work_handler(struct work_struct *work) | |
1617 | { | |
1618 | struct ports_device *portdev; | |
1619 | struct virtqueue *vq; | |
1620 | struct port_buffer *buf; | |
1621 | unsigned int len; | |
1622 | ||
1623 | portdev = container_of(work, struct ports_device, control_work); | |
1624 | vq = portdev->c_ivq; | |
1625 | ||
1626 | spin_lock(&portdev->cvq_lock); | |
505b0451 | 1627 | while ((buf = virtqueue_get_buf(vq, &len))) { |
17634ba2 AS |
1628 | spin_unlock(&portdev->cvq_lock); |
1629 | ||
1630 | buf->len = len; | |
1631 | buf->offset = 0; | |
1632 | ||
1633 | handle_control_message(portdev, buf); | |
1634 | ||
1635 | spin_lock(&portdev->cvq_lock); | |
1636 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
1637 | dev_warn(&portdev->vdev->dev, | |
1638 | "Error adding buffer to queue\n"); | |
1639 | free_buf(buf); | |
1640 | } | |
1641 | } | |
1642 | spin_unlock(&portdev->cvq_lock); | |
1643 | } | |
1644 | ||
2770c5ea AS |
1645 | static void out_intr(struct virtqueue *vq) |
1646 | { | |
1647 | struct port *port; | |
1648 | ||
1649 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1650 | if (!port) | |
1651 | return; | |
1652 | ||
1653 | wake_up_interruptible(&port->waitqueue); | |
1654 | } | |
1655 | ||
17634ba2 AS |
1656 | static void in_intr(struct virtqueue *vq) |
1657 | { | |
1658 | struct port *port; | |
1659 | unsigned long flags; | |
1660 | ||
1661 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1662 | if (!port) | |
1663 | return; | |
1664 | ||
1665 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d25a9dda | 1666 | port->inbuf = get_inbuf(port); |
17634ba2 | 1667 | |
88f251ac AS |
1668 | /* |
1669 | * Don't queue up data when port is closed. This condition | |
1670 | * can be reached when a console port is not yet connected (no | |
1671 | * tty is spawned) and the host sends out data to console | |
1672 | * ports. For generic serial ports, the host won't | |
1673 | * (shouldn't) send data till the guest is connected. | |
1674 | */ | |
1675 | if (!port->guest_connected) | |
1676 | discard_port_data(port); | |
1677 | ||
17634ba2 AS |
1678 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1679 | ||
2030fa49 AS |
1680 | wake_up_interruptible(&port->waitqueue); |
1681 | ||
55f6bcce AS |
1682 | /* Send a SIGIO indicating new data in case the process asked for it */ |
1683 | send_sigio_to_port(port); | |
1684 | ||
17634ba2 AS |
1685 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1686 | hvc_kick(); | |
1687 | } | |
1688 | ||
1689 | static void control_intr(struct virtqueue *vq) | |
1690 | { | |
1691 | struct ports_device *portdev; | |
1692 | ||
1693 | portdev = vq->vdev->priv; | |
1694 | schedule_work(&portdev->control_work); | |
1695 | } | |
1696 | ||
7f5d810d AS |
1697 | static void config_intr(struct virtio_device *vdev) |
1698 | { | |
1699 | struct ports_device *portdev; | |
1700 | ||
1701 | portdev = vdev->priv; | |
99f905f8 | 1702 | |
4038f5b7 | 1703 | if (!use_multiport(portdev)) { |
9778829c AS |
1704 | struct port *port; |
1705 | u16 rows, cols; | |
1706 | ||
1707 | vdev->config->get(vdev, | |
1708 | offsetof(struct virtio_console_config, cols), | |
1709 | &cols, sizeof(u16)); | |
1710 | vdev->config->get(vdev, | |
1711 | offsetof(struct virtio_console_config, rows), | |
1712 | &rows, sizeof(u16)); | |
1713 | ||
1714 | port = find_port_by_id(portdev, 0); | |
1715 | set_console_size(port, rows, cols); | |
1716 | ||
4038f5b7 AS |
1717 | /* |
1718 | * We'll use this way of resizing only for legacy | |
1719 | * support. For newer userspace | |
1720 | * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages | |
1721 | * to indicate console size changes so that it can be | |
1722 | * done per-port. | |
1723 | */ | |
9778829c | 1724 | resize_console(port); |
4038f5b7 | 1725 | } |
7f5d810d AS |
1726 | } |
1727 | ||
2658a79a AS |
1728 | static int init_vqs(struct ports_device *portdev) |
1729 | { | |
1730 | vq_callback_t **io_callbacks; | |
1731 | char **io_names; | |
1732 | struct virtqueue **vqs; | |
17634ba2 | 1733 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1734 | int err; |
1735 | ||
17634ba2 AS |
1736 | nr_ports = portdev->config.max_nr_ports; |
1737 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1738 | |
1739 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
2658a79a | 1740 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); |
2658a79a | 1741 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); |
2658a79a AS |
1742 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1743 | GFP_KERNEL); | |
2658a79a AS |
1744 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1745 | GFP_KERNEL); | |
22e132ff | 1746 | if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || |
286f9a22 | 1747 | !portdev->out_vqs) { |
2658a79a | 1748 | err = -ENOMEM; |
22e132ff | 1749 | goto free; |
2658a79a AS |
1750 | } |
1751 | ||
17634ba2 AS |
1752 | /* |
1753 | * For backward compat (newer host but older guest), the host | |
1754 | * spawns a console port first and also inits the vqs for port | |
1755 | * 0 before others. | |
1756 | */ | |
1757 | j = 0; | |
1758 | io_callbacks[j] = in_intr; | |
2770c5ea | 1759 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1760 | io_names[j] = "input"; |
1761 | io_names[j + 1] = "output"; | |
1762 | j += 2; | |
1763 | ||
1764 | if (use_multiport(portdev)) { | |
1765 | io_callbacks[j] = control_intr; | |
1766 | io_callbacks[j + 1] = NULL; | |
1767 | io_names[j] = "control-i"; | |
1768 | io_names[j + 1] = "control-o"; | |
1769 | ||
1770 | for (i = 1; i < nr_ports; i++) { | |
1771 | j += 2; | |
1772 | io_callbacks[j] = in_intr; | |
2770c5ea | 1773 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1774 | io_names[j] = "input"; |
1775 | io_names[j + 1] = "output"; | |
1776 | } | |
1777 | } | |
2658a79a AS |
1778 | /* Find the queues. */ |
1779 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1780 | io_callbacks, | |
1781 | (const char **)io_names); | |
1782 | if (err) | |
22e132ff | 1783 | goto free; |
2658a79a | 1784 | |
17634ba2 | 1785 | j = 0; |
2658a79a AS |
1786 | portdev->in_vqs[0] = vqs[0]; |
1787 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1788 | j += 2; |
1789 | if (use_multiport(portdev)) { | |
1790 | portdev->c_ivq = vqs[j]; | |
1791 | portdev->c_ovq = vqs[j + 1]; | |
1792 | ||
1793 | for (i = 1; i < nr_ports; i++) { | |
1794 | j += 2; | |
1795 | portdev->in_vqs[i] = vqs[j]; | |
1796 | portdev->out_vqs[i] = vqs[j + 1]; | |
1797 | } | |
1798 | } | |
2658a79a | 1799 | kfree(io_names); |
22e132ff | 1800 | kfree(io_callbacks); |
2658a79a AS |
1801 | kfree(vqs); |
1802 | ||
1803 | return 0; | |
1804 | ||
22e132ff | 1805 | free: |
2658a79a | 1806 | kfree(portdev->out_vqs); |
2658a79a | 1807 | kfree(portdev->in_vqs); |
22e132ff JS |
1808 | kfree(io_names); |
1809 | kfree(io_callbacks); | |
2658a79a | 1810 | kfree(vqs); |
22e132ff | 1811 | |
2658a79a AS |
1812 | return err; |
1813 | } | |
1814 | ||
fb08bd27 AS |
1815 | static const struct file_operations portdev_fops = { |
1816 | .owner = THIS_MODULE, | |
1817 | }; | |
1818 | ||
a0e2dbfc AS |
1819 | static void remove_vqs(struct ports_device *portdev) |
1820 | { | |
1821 | portdev->vdev->config->del_vqs(portdev->vdev); | |
1822 | kfree(portdev->in_vqs); | |
1823 | kfree(portdev->out_vqs); | |
1824 | } | |
1825 | ||
1826 | static void remove_controlq_data(struct ports_device *portdev) | |
1827 | { | |
1828 | struct port_buffer *buf; | |
1829 | unsigned int len; | |
1830 | ||
1831 | if (!use_multiport(portdev)) | |
1832 | return; | |
1833 | ||
1834 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) | |
1835 | free_buf(buf); | |
1836 | ||
1837 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) | |
1838 | free_buf(buf); | |
1839 | } | |
1840 | ||
1c85bf35 AS |
1841 | /* |
1842 | * Once we're further in boot, we get probed like any other virtio | |
1843 | * device. | |
17634ba2 AS |
1844 | * |
1845 | * If the host also supports multiple console ports, we check the | |
1846 | * config space to see how many ports the host has spawned. We | |
1847 | * initialize each port found. | |
1c85bf35 | 1848 | */ |
2223cbec | 1849 | static int virtcons_probe(struct virtio_device *vdev) |
1c85bf35 | 1850 | { |
1c85bf35 AS |
1851 | struct ports_device *portdev; |
1852 | int err; | |
17634ba2 | 1853 | bool multiport; |
5e38483b CB |
1854 | bool early = early_put_chars != NULL; |
1855 | ||
1856 | /* Ensure to read early_put_chars now */ | |
1857 | barrier(); | |
1c85bf35 AS |
1858 | |
1859 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1860 | if (!portdev) { | |
1861 | err = -ENOMEM; | |
1862 | goto fail; | |
1863 | } | |
1864 | ||
1865 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1866 | portdev->vdev = vdev; | |
1867 | vdev->priv = portdev; | |
1868 | ||
fb08bd27 AS |
1869 | spin_lock_irq(&pdrvdata_lock); |
1870 | portdev->drv_index = pdrvdata.index++; | |
1871 | spin_unlock_irq(&pdrvdata_lock); | |
1872 | ||
1873 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1874 | &portdev_fops); | |
1875 | if (portdev->chr_major < 0) { | |
1876 | dev_err(&vdev->dev, | |
1877 | "Error %d registering chrdev for device %u\n", | |
1878 | portdev->chr_major, portdev->drv_index); | |
1879 | err = portdev->chr_major; | |
1880 | goto free; | |
1881 | } | |
1882 | ||
17634ba2 | 1883 | multiport = false; |
17634ba2 | 1884 | portdev->config.max_nr_ports = 1; |
51c6d61a SL |
1885 | if (virtio_config_val(vdev, VIRTIO_CONSOLE_F_MULTIPORT, |
1886 | offsetof(struct virtio_console_config, | |
1887 | max_nr_ports), | |
1888 | &portdev->config.max_nr_ports) == 0) | |
17634ba2 | 1889 | multiport = true; |
17634ba2 | 1890 | |
2658a79a AS |
1891 | err = init_vqs(portdev); |
1892 | if (err < 0) { | |
1893 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1894 | goto free_chrdev; |
2658a79a | 1895 | } |
1c85bf35 | 1896 | |
17634ba2 AS |
1897 | spin_lock_init(&portdev->ports_lock); |
1898 | INIT_LIST_HEAD(&portdev->ports); | |
1899 | ||
1900 | if (multiport) { | |
335a64a5 AS |
1901 | unsigned int nr_added_bufs; |
1902 | ||
17634ba2 AS |
1903 | spin_lock_init(&portdev->cvq_lock); |
1904 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
1905 | ||
335a64a5 AS |
1906 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
1907 | if (!nr_added_bufs) { | |
22a29eac AS |
1908 | dev_err(&vdev->dev, |
1909 | "Error allocating buffers for control queue\n"); | |
1910 | err = -ENOMEM; | |
1911 | goto free_vqs; | |
1912 | } | |
1d05160b AS |
1913 | } else { |
1914 | /* | |
1915 | * For backward compatibility: Create a console port | |
1916 | * if we're running on older host. | |
1917 | */ | |
1918 | add_port(portdev, 0); | |
17634ba2 AS |
1919 | } |
1920 | ||
6bdf2afd AS |
1921 | spin_lock_irq(&pdrvdata_lock); |
1922 | list_add_tail(&portdev->list, &pdrvdata.portdevs); | |
1923 | spin_unlock_irq(&pdrvdata_lock); | |
1924 | ||
f909f850 AS |
1925 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
1926 | VIRTIO_CONSOLE_DEVICE_READY, 1); | |
5e38483b CB |
1927 | |
1928 | /* | |
1929 | * If there was an early virtio console, assume that there are no | |
1930 | * other consoles. We need to wait until the hvc_alloc matches the | |
1931 | * hvc_instantiate, otherwise tty_open will complain, resulting in | |
1932 | * a "Warning: unable to open an initial console" boot failure. | |
1933 | * Without multiport this is done in add_port above. With multiport | |
1934 | * this might take some host<->guest communication - thus we have to | |
1935 | * wait. | |
1936 | */ | |
1937 | if (multiport && early) | |
1938 | wait_for_completion(&early_console_added); | |
1939 | ||
31610434 RR |
1940 | return 0; |
1941 | ||
22a29eac | 1942 | free_vqs: |
0643e4c6 JL |
1943 | /* The host might want to notify mgmt sw about device add failure */ |
1944 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, | |
1945 | VIRTIO_CONSOLE_DEVICE_READY, 0); | |
a0e2dbfc | 1946 | remove_vqs(portdev); |
fb08bd27 AS |
1947 | free_chrdev: |
1948 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 1949 | free: |
1c85bf35 | 1950 | kfree(portdev); |
31610434 RR |
1951 | fail: |
1952 | return err; | |
1953 | } | |
1954 | ||
7177876f AS |
1955 | static void virtcons_remove(struct virtio_device *vdev) |
1956 | { | |
1957 | struct ports_device *portdev; | |
1958 | struct port *port, *port2; | |
7177876f AS |
1959 | |
1960 | portdev = vdev->priv; | |
1961 | ||
6bdf2afd AS |
1962 | spin_lock_irq(&pdrvdata_lock); |
1963 | list_del(&portdev->list); | |
1964 | spin_unlock_irq(&pdrvdata_lock); | |
1965 | ||
02238959 AS |
1966 | /* Disable interrupts for vqs */ |
1967 | vdev->config->reset(vdev); | |
1968 | /* Finish up work that's lined up */ | |
7177876f | 1969 | cancel_work_sync(&portdev->control_work); |
7177876f AS |
1970 | |
1971 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
b353a6b8 | 1972 | unplug_port(port); |
7177876f AS |
1973 | |
1974 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
1975 | ||
e062013c AS |
1976 | /* |
1977 | * When yanking out a device, we immediately lose the | |
1978 | * (device-side) queues. So there's no point in keeping the | |
1979 | * guest side around till we drop our final reference. This | |
1980 | * also means that any ports which are in an open state will | |
1981 | * have to just stop using the port, as the vqs are going | |
1982 | * away. | |
1983 | */ | |
a0e2dbfc AS |
1984 | remove_controlq_data(portdev); |
1985 | remove_vqs(portdev); | |
7177876f AS |
1986 | kfree(portdev); |
1987 | } | |
1988 | ||
31610434 RR |
1989 | static struct virtio_device_id id_table[] = { |
1990 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
1991 | { 0 }, | |
1992 | }; | |
1993 | ||
c2983458 CB |
1994 | static unsigned int features[] = { |
1995 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 1996 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
1997 | }; |
1998 | ||
2b8f41d8 AS |
1999 | #ifdef CONFIG_PM |
2000 | static int virtcons_freeze(struct virtio_device *vdev) | |
2001 | { | |
2002 | struct ports_device *portdev; | |
2003 | struct port *port; | |
2004 | ||
2005 | portdev = vdev->priv; | |
2006 | ||
2007 | vdev->config->reset(vdev); | |
2008 | ||
c743d09d | 2009 | virtqueue_disable_cb(portdev->c_ivq); |
2b8f41d8 | 2010 | cancel_work_sync(&portdev->control_work); |
c743d09d AS |
2011 | /* |
2012 | * Once more: if control_work_handler() was running, it would | |
2013 | * enable the cb as the last step. | |
2014 | */ | |
2015 | virtqueue_disable_cb(portdev->c_ivq); | |
2b8f41d8 AS |
2016 | remove_controlq_data(portdev); |
2017 | ||
2018 | list_for_each_entry(port, &portdev->ports, list) { | |
c743d09d AS |
2019 | virtqueue_disable_cb(port->in_vq); |
2020 | virtqueue_disable_cb(port->out_vq); | |
2b8f41d8 AS |
2021 | /* |
2022 | * We'll ask the host later if the new invocation has | |
2023 | * the port opened or closed. | |
2024 | */ | |
2025 | port->host_connected = false; | |
2026 | remove_port_data(port); | |
2027 | } | |
2028 | remove_vqs(portdev); | |
2029 | ||
2030 | return 0; | |
2031 | } | |
2032 | ||
2033 | static int virtcons_restore(struct virtio_device *vdev) | |
2034 | { | |
2035 | struct ports_device *portdev; | |
2036 | struct port *port; | |
2037 | int ret; | |
2038 | ||
2039 | portdev = vdev->priv; | |
2040 | ||
2041 | ret = init_vqs(portdev); | |
2042 | if (ret) | |
2043 | return ret; | |
2044 | ||
2045 | if (use_multiport(portdev)) | |
2046 | fill_queue(portdev->c_ivq, &portdev->cvq_lock); | |
2047 | ||
2048 | list_for_each_entry(port, &portdev->ports, list) { | |
2049 | port->in_vq = portdev->in_vqs[port->id]; | |
2050 | port->out_vq = portdev->out_vqs[port->id]; | |
2051 | ||
2052 | fill_queue(port->in_vq, &port->inbuf_lock); | |
2053 | ||
2054 | /* Get port open/close status on the host */ | |
2055 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
fa8b66cc AS |
2056 | |
2057 | /* | |
2058 | * If a port was open at the time of suspending, we | |
2059 | * have to let the host know that it's still open. | |
2060 | */ | |
2061 | if (port->guest_connected) | |
2062 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
2b8f41d8 AS |
2063 | } |
2064 | return 0; | |
2065 | } | |
2066 | #endif | |
2067 | ||
31610434 | 2068 | static struct virtio_driver virtio_console = { |
c2983458 CB |
2069 | .feature_table = features, |
2070 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
2071 | .driver.name = KBUILD_MODNAME, |
2072 | .driver.owner = THIS_MODULE, | |
2073 | .id_table = id_table, | |
2074 | .probe = virtcons_probe, | |
7177876f | 2075 | .remove = virtcons_remove, |
7f5d810d | 2076 | .config_changed = config_intr, |
2b8f41d8 AS |
2077 | #ifdef CONFIG_PM |
2078 | .freeze = virtcons_freeze, | |
2079 | .restore = virtcons_restore, | |
2080 | #endif | |
31610434 RR |
2081 | }; |
2082 | ||
2083 | static int __init init(void) | |
2084 | { | |
fb08bd27 AS |
2085 | int err; |
2086 | ||
2087 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
2088 | if (IS_ERR(pdrvdata.class)) { | |
2089 | err = PTR_ERR(pdrvdata.class); | |
2090 | pr_err("Error %d creating virtio-ports class\n", err); | |
2091 | return err; | |
2092 | } | |
d99393ef AS |
2093 | |
2094 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
2095 | if (!pdrvdata.debugfs_dir) { | |
2096 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
2097 | PTR_ERR(pdrvdata.debugfs_dir)); | |
2098 | } | |
38edf58d | 2099 | INIT_LIST_HEAD(&pdrvdata.consoles); |
6bdf2afd | 2100 | INIT_LIST_HEAD(&pdrvdata.portdevs); |
38edf58d | 2101 | |
33e1afc3 AK |
2102 | err = register_virtio_driver(&virtio_console); |
2103 | if (err < 0) { | |
2104 | pr_err("Error %d registering virtio driver\n", err); | |
2105 | goto free; | |
2106 | } | |
2107 | return 0; | |
2108 | free: | |
2109 | if (pdrvdata.debugfs_dir) | |
2110 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
2111 | class_destroy(pdrvdata.class); | |
2112 | return err; | |
31610434 | 2113 | } |
7177876f AS |
2114 | |
2115 | static void __exit fini(void) | |
2116 | { | |
2117 | unregister_virtio_driver(&virtio_console); | |
2118 | ||
2119 | class_destroy(pdrvdata.class); | |
2120 | if (pdrvdata.debugfs_dir) | |
2121 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
2122 | } | |
31610434 | 2123 | module_init(init); |
7177876f | 2124 | module_exit(fini); |
31610434 RR |
2125 | |
2126 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2127 | MODULE_DESCRIPTION("Virtio console driver"); | |
2128 | MODULE_LICENSE("GPL"); |