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> |
1b637046 SB |
40 | #include <linux/dma-mapping.h> |
41 | #include <linux/kconfig.h> | |
51df0acc | 42 | #include "../tty/hvc/hvc_console.h" |
31610434 | 43 | |
1b637046 SB |
44 | #define is_rproc_enabled IS_ENABLED(CONFIG_REMOTEPROC) |
45 | ||
38edf58d AS |
46 | /* |
47 | * This is a global struct for storing common data for all the devices | |
48 | * this driver handles. | |
49 | * | |
50 | * Mainly, it has a linked list for all the consoles in one place so | |
51 | * that callbacks from hvc for get_chars(), put_chars() work properly | |
52 | * across multiple devices and multiple ports per device. | |
53 | */ | |
54 | struct ports_driver_data { | |
fb08bd27 AS |
55 | /* Used for registering chardevs */ |
56 | struct class *class; | |
57 | ||
d99393ef AS |
58 | /* Used for exporting per-port information to debugfs */ |
59 | struct dentry *debugfs_dir; | |
60 | ||
6bdf2afd AS |
61 | /* List of all the devices we're handling */ |
62 | struct list_head portdevs; | |
63 | ||
d8a02bd5 RR |
64 | /* |
65 | * This is used to keep track of the number of hvc consoles | |
66 | * spawned by this driver. This number is given as the first | |
67 | * argument to hvc_alloc(). To correctly map an initial | |
68 | * console spawned via hvc_instantiate to the console being | |
69 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
70 | * | |
71 | * We also just assume the first console being initialised was | |
72 | * the first one that got used as the initial console. | |
73 | */ | |
74 | unsigned int next_vtermno; | |
75 | ||
38edf58d AS |
76 | /* All the console devices handled by this driver */ |
77 | struct list_head consoles; | |
78 | }; | |
79 | static struct ports_driver_data pdrvdata; | |
80 | ||
81 | DEFINE_SPINLOCK(pdrvdata_lock); | |
5e38483b | 82 | DECLARE_COMPLETION(early_console_added); |
38edf58d | 83 | |
4f23c573 AS |
84 | /* This struct holds information that's relevant only for console ports */ |
85 | struct console { | |
86 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
87 | struct list_head list; | |
88 | ||
89 | /* The hvc device associated with this console port */ | |
90 | struct hvc_struct *hvc; | |
91 | ||
9778829c AS |
92 | /* The size of the console */ |
93 | struct winsize ws; | |
94 | ||
4f23c573 AS |
95 | /* |
96 | * This number identifies the number that we used to register | |
97 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
98 | * number passed on by the hvc callbacks to us to | |
99 | * differentiate between the other console ports handled by | |
100 | * this driver | |
101 | */ | |
102 | u32 vtermno; | |
103 | }; | |
104 | ||
fdb9a054 AS |
105 | struct port_buffer { |
106 | char *buf; | |
107 | ||
108 | /* size of the buffer in *buf above */ | |
109 | size_t size; | |
110 | ||
111 | /* used length of the buffer */ | |
112 | size_t len; | |
113 | /* offset in the buf from which to consume data */ | |
114 | size_t offset; | |
276a3e95 | 115 | |
1b637046 SB |
116 | /* DMA address of buffer */ |
117 | dma_addr_t dma; | |
118 | ||
119 | /* Device we got DMA memory from */ | |
120 | struct device *dev; | |
121 | ||
122 | /* List of pending dma buffers to free */ | |
123 | struct list_head list; | |
124 | ||
276a3e95 SB |
125 | /* If sgpages == 0 then buf is used */ |
126 | unsigned int sgpages; | |
127 | ||
128 | /* sg is used if spages > 0. sg must be the last in is struct */ | |
129 | struct scatterlist sg[0]; | |
fdb9a054 AS |
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 { | |
6bdf2afd AS |
137 | /* Next portdev in the list, head is in the pdrvdata struct */ |
138 | struct list_head list; | |
139 | ||
17634ba2 AS |
140 | /* |
141 | * Workqueue handlers where we process deferred work after | |
142 | * notification | |
143 | */ | |
144 | struct work_struct control_work; | |
145 | ||
146 | struct list_head ports; | |
147 | ||
148 | /* To protect the list of ports */ | |
149 | spinlock_t ports_lock; | |
150 | ||
151 | /* To protect the vq operations for the control channel */ | |
152 | spinlock_t cvq_lock; | |
153 | ||
154 | /* The current config space is stored here */ | |
b99fa815 | 155 | struct virtio_console_config config; |
17634ba2 AS |
156 | |
157 | /* The virtio device we're associated with */ | |
158 | struct virtio_device *vdev; | |
159 | ||
160 | /* | |
161 | * A couple of virtqueues for the control channel: one for | |
162 | * guest->host transfers, one for host->guest transfers | |
163 | */ | |
164 | struct virtqueue *c_ivq, *c_ovq; | |
165 | ||
166 | /* Array of per-port IO virtqueues */ | |
167 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 | 168 | |
fb08bd27 AS |
169 | /* Major number for this device. Ports will be created as minors. */ |
170 | int chr_major; | |
17634ba2 AS |
171 | }; |
172 | ||
17e5b4f2 AS |
173 | struct port_stats { |
174 | unsigned long bytes_sent, bytes_received, bytes_discarded; | |
175 | }; | |
176 | ||
1c85bf35 | 177 | /* This struct holds the per-port data */ |
21206ede | 178 | struct port { |
17634ba2 AS |
179 | /* Next port in the list, head is in the ports_device */ |
180 | struct list_head list; | |
181 | ||
1c85bf35 AS |
182 | /* Pointer to the parent virtio_console device */ |
183 | struct ports_device *portdev; | |
fdb9a054 AS |
184 | |
185 | /* The current buffer from which data has to be fed to readers */ | |
186 | struct port_buffer *inbuf; | |
21206ede | 187 | |
203baab8 AS |
188 | /* |
189 | * To protect the operations on the in_vq associated with this | |
190 | * port. Has to be a spinlock because it can be called from | |
191 | * interrupt context (get_char()). | |
192 | */ | |
193 | spinlock_t inbuf_lock; | |
194 | ||
cdfadfc1 AS |
195 | /* Protect the operations on the out_vq. */ |
196 | spinlock_t outvq_lock; | |
197 | ||
1c85bf35 AS |
198 | /* The IO vqs for this port */ |
199 | struct virtqueue *in_vq, *out_vq; | |
200 | ||
d99393ef AS |
201 | /* File in the debugfs directory that exposes this port's information */ |
202 | struct dentry *debugfs_file; | |
203 | ||
17e5b4f2 AS |
204 | /* |
205 | * Keep count of the bytes sent, received and discarded for | |
206 | * this port for accounting and debugging purposes. These | |
207 | * counts are not reset across port open / close events. | |
208 | */ | |
209 | struct port_stats stats; | |
210 | ||
4f23c573 AS |
211 | /* |
212 | * The entries in this struct will be valid if this port is | |
213 | * hooked up to an hvc console | |
214 | */ | |
215 | struct console cons; | |
17634ba2 | 216 | |
fb08bd27 | 217 | /* Each port associates with a separate char device */ |
d22a6989 | 218 | struct cdev *cdev; |
fb08bd27 AS |
219 | struct device *dev; |
220 | ||
b353a6b8 AS |
221 | /* Reference-counting to handle port hot-unplugs and file operations */ |
222 | struct kref kref; | |
223 | ||
2030fa49 AS |
224 | /* A waitqueue for poll() or blocking read operations */ |
225 | wait_queue_head_t waitqueue; | |
226 | ||
431edb8a AS |
227 | /* The 'name' of the port that we expose via sysfs properties */ |
228 | char *name; | |
229 | ||
3eae0ade AS |
230 | /* We can notify apps of host connect / disconnect events via SIGIO */ |
231 | struct fasync_struct *async_queue; | |
232 | ||
17634ba2 AS |
233 | /* The 'id' to identify the port with the Host */ |
234 | u32 id; | |
2030fa49 | 235 | |
cdfadfc1 AS |
236 | bool outvq_full; |
237 | ||
2030fa49 AS |
238 | /* Is the host device open */ |
239 | bool host_connected; | |
3c7969cc AS |
240 | |
241 | /* We should allow only one process to open a port */ | |
242 | bool guest_connected; | |
21206ede | 243 | }; |
31610434 | 244 | |
971f3390 RR |
245 | /* This is the very early arch-specified put chars function. */ |
246 | static int (*early_put_chars)(u32, const char *, int); | |
247 | ||
38edf58d AS |
248 | static struct port *find_port_by_vtermno(u32 vtermno) |
249 | { | |
250 | struct port *port; | |
4f23c573 | 251 | struct console *cons; |
38edf58d AS |
252 | unsigned long flags; |
253 | ||
254 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
255 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
256 | if (cons->vtermno == vtermno) { | |
257 | port = container_of(cons, struct port, cons); | |
38edf58d | 258 | goto out; |
4f23c573 | 259 | } |
38edf58d AS |
260 | } |
261 | port = NULL; | |
262 | out: | |
263 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
264 | return port; | |
265 | } | |
266 | ||
04950cdf AS |
267 | static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, |
268 | dev_t dev) | |
269 | { | |
270 | struct port *port; | |
271 | unsigned long flags; | |
272 | ||
273 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
274 | list_for_each_entry(port, &portdev->ports, list) | |
d22a6989 | 275 | if (port->cdev->dev == dev) |
04950cdf AS |
276 | goto out; |
277 | port = NULL; | |
278 | out: | |
279 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
280 | ||
281 | return port; | |
282 | } | |
283 | ||
284 | static struct port *find_port_by_devt(dev_t dev) | |
285 | { | |
286 | struct ports_device *portdev; | |
287 | struct port *port; | |
288 | unsigned long flags; | |
289 | ||
290 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
291 | list_for_each_entry(portdev, &pdrvdata.portdevs, list) { | |
292 | port = find_port_by_devt_in_portdev(portdev, dev); | |
293 | if (port) | |
294 | goto out; | |
295 | } | |
296 | port = NULL; | |
297 | out: | |
298 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
299 | return port; | |
300 | } | |
301 | ||
17634ba2 AS |
302 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
303 | { | |
304 | struct port *port; | |
305 | unsigned long flags; | |
306 | ||
307 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
308 | list_for_each_entry(port, &portdev->ports, list) | |
309 | if (port->id == id) | |
310 | goto out; | |
311 | port = NULL; | |
312 | out: | |
313 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
314 | ||
315 | return port; | |
316 | } | |
317 | ||
203baab8 AS |
318 | static struct port *find_port_by_vq(struct ports_device *portdev, |
319 | struct virtqueue *vq) | |
320 | { | |
321 | struct port *port; | |
203baab8 AS |
322 | unsigned long flags; |
323 | ||
17634ba2 AS |
324 | spin_lock_irqsave(&portdev->ports_lock, flags); |
325 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
326 | if (port->in_vq == vq || port->out_vq == vq) |
327 | goto out; | |
203baab8 AS |
328 | port = NULL; |
329 | out: | |
17634ba2 | 330 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
331 | return port; |
332 | } | |
333 | ||
17634ba2 AS |
334 | static bool is_console_port(struct port *port) |
335 | { | |
336 | if (port->cons.hvc) | |
337 | return true; | |
338 | return false; | |
339 | } | |
340 | ||
1b637046 SB |
341 | static bool is_rproc_serial(const struct virtio_device *vdev) |
342 | { | |
343 | return is_rproc_enabled && vdev->id.device == VIRTIO_ID_RPROC_SERIAL; | |
344 | } | |
345 | ||
17634ba2 AS |
346 | static inline bool use_multiport(struct ports_device *portdev) |
347 | { | |
348 | /* | |
349 | * This condition can be true when put_chars is called from | |
350 | * early_init | |
351 | */ | |
352 | if (!portdev->vdev) | |
353 | return 0; | |
354 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
355 | } | |
356 | ||
1b637046 SB |
357 | static DEFINE_SPINLOCK(dma_bufs_lock); |
358 | static LIST_HEAD(pending_free_dma_bufs); | |
359 | ||
360 | static void free_buf(struct port_buffer *buf, bool can_sleep) | |
fdb9a054 | 361 | { |
276a3e95 SB |
362 | unsigned int i; |
363 | ||
276a3e95 SB |
364 | for (i = 0; i < buf->sgpages; i++) { |
365 | struct page *page = sg_page(&buf->sg[i]); | |
366 | if (!page) | |
367 | break; | |
368 | put_page(page); | |
369 | } | |
370 | ||
1b637046 SB |
371 | if (!buf->dev) { |
372 | kfree(buf->buf); | |
373 | } else if (is_rproc_enabled) { | |
374 | unsigned long flags; | |
375 | ||
376 | /* dma_free_coherent requires interrupts to be enabled. */ | |
377 | if (!can_sleep) { | |
378 | /* queue up dma-buffers to be freed later */ | |
379 | spin_lock_irqsave(&dma_bufs_lock, flags); | |
380 | list_add_tail(&buf->list, &pending_free_dma_bufs); | |
381 | spin_unlock_irqrestore(&dma_bufs_lock, flags); | |
382 | return; | |
383 | } | |
384 | dma_free_coherent(buf->dev, buf->size, buf->buf, buf->dma); | |
385 | ||
386 | /* Release device refcnt and allow it to be freed */ | |
387 | put_device(buf->dev); | |
388 | } | |
389 | ||
fdb9a054 AS |
390 | kfree(buf); |
391 | } | |
392 | ||
1b637046 SB |
393 | static void reclaim_dma_bufs(void) |
394 | { | |
395 | unsigned long flags; | |
396 | struct port_buffer *buf, *tmp; | |
397 | LIST_HEAD(tmp_list); | |
398 | ||
399 | if (list_empty(&pending_free_dma_bufs)) | |
400 | return; | |
401 | ||
402 | /* Create a copy of the pending_free_dma_bufs while holding the lock */ | |
403 | spin_lock_irqsave(&dma_bufs_lock, flags); | |
404 | list_cut_position(&tmp_list, &pending_free_dma_bufs, | |
405 | pending_free_dma_bufs.prev); | |
406 | spin_unlock_irqrestore(&dma_bufs_lock, flags); | |
407 | ||
408 | /* Release the dma buffers, without irqs enabled */ | |
409 | list_for_each_entry_safe(buf, tmp, &tmp_list, list) { | |
410 | list_del(&buf->list); | |
411 | free_buf(buf, true); | |
412 | } | |
413 | } | |
414 | ||
276a3e95 SB |
415 | static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size, |
416 | int pages) | |
fdb9a054 AS |
417 | { |
418 | struct port_buffer *buf; | |
419 | ||
1b637046 SB |
420 | reclaim_dma_bufs(); |
421 | ||
276a3e95 SB |
422 | /* |
423 | * Allocate buffer and the sg list. The sg list array is allocated | |
424 | * directly after the port_buffer struct. | |
425 | */ | |
426 | buf = kmalloc(sizeof(*buf) + sizeof(struct scatterlist) * pages, | |
427 | GFP_KERNEL); | |
fdb9a054 AS |
428 | if (!buf) |
429 | goto fail; | |
276a3e95 SB |
430 | |
431 | buf->sgpages = pages; | |
432 | if (pages > 0) { | |
1b637046 | 433 | buf->dev = NULL; |
276a3e95 SB |
434 | buf->buf = NULL; |
435 | return buf; | |
436 | } | |
437 | ||
1b637046 SB |
438 | if (is_rproc_serial(vq->vdev)) { |
439 | /* | |
440 | * Allocate DMA memory from ancestor. When a virtio | |
441 | * device is created by remoteproc, the DMA memory is | |
442 | * associated with the grandparent device: | |
443 | * vdev => rproc => platform-dev. | |
444 | * The code here would have been less quirky if | |
445 | * DMA_MEMORY_INCLUDES_CHILDREN had been supported | |
446 | * in dma-coherent.c | |
447 | */ | |
448 | if (!vq->vdev->dev.parent || !vq->vdev->dev.parent->parent) | |
449 | goto free_buf; | |
450 | buf->dev = vq->vdev->dev.parent->parent; | |
451 | ||
452 | /* Increase device refcnt to avoid freeing it */ | |
453 | get_device(buf->dev); | |
454 | buf->buf = dma_alloc_coherent(buf->dev, buf_size, &buf->dma, | |
455 | GFP_KERNEL); | |
456 | } else { | |
457 | buf->dev = NULL; | |
458 | buf->buf = kmalloc(buf_size, GFP_KERNEL); | |
459 | } | |
460 | ||
fdb9a054 AS |
461 | if (!buf->buf) |
462 | goto free_buf; | |
463 | buf->len = 0; | |
464 | buf->offset = 0; | |
465 | buf->size = buf_size; | |
466 | return buf; | |
467 | ||
468 | free_buf: | |
469 | kfree(buf); | |
470 | fail: | |
471 | return NULL; | |
472 | } | |
473 | ||
a3cde449 | 474 | /* Callers should take appropriate locks */ |
defde669 | 475 | static struct port_buffer *get_inbuf(struct port *port) |
a3cde449 AS |
476 | { |
477 | struct port_buffer *buf; | |
a3cde449 AS |
478 | unsigned int len; |
479 | ||
d25a9dda AS |
480 | if (port->inbuf) |
481 | return port->inbuf; | |
482 | ||
483 | buf = virtqueue_get_buf(port->in_vq, &len); | |
a3cde449 AS |
484 | if (buf) { |
485 | buf->len = len; | |
486 | buf->offset = 0; | |
17e5b4f2 | 487 | port->stats.bytes_received += len; |
a3cde449 AS |
488 | } |
489 | return buf; | |
490 | } | |
491 | ||
e27b5198 AS |
492 | /* |
493 | * Create a scatter-gather list representing our input buffer and put | |
494 | * it in the queue. | |
495 | * | |
496 | * Callers should take appropriate locks. | |
497 | */ | |
203baab8 | 498 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
499 | { |
500 | struct scatterlist sg[1]; | |
203baab8 | 501 | int ret; |
1c85bf35 | 502 | |
e27b5198 AS |
503 | sg_init_one(sg, buf->buf, buf->size); |
504 | ||
f96fde41 | 505 | ret = virtqueue_add_buf(vq, sg, 0, 1, buf, GFP_ATOMIC); |
505b0451 | 506 | virtqueue_kick(vq); |
49e86f16 AS |
507 | if (!ret) |
508 | ret = vq->num_free; | |
203baab8 AS |
509 | return ret; |
510 | } | |
511 | ||
88f251ac AS |
512 | /* Discard any unread data this port has. Callers lockers. */ |
513 | static void discard_port_data(struct port *port) | |
514 | { | |
515 | struct port_buffer *buf; | |
2d24cdaa | 516 | unsigned int err; |
88f251ac | 517 | |
d7a62cd0 AS |
518 | if (!port->portdev) { |
519 | /* Device has been unplugged. vqs are already gone. */ | |
520 | return; | |
521 | } | |
2d24cdaa | 522 | buf = get_inbuf(port); |
88f251ac | 523 | |
ce072a0c | 524 | err = 0; |
d6933561 | 525 | while (buf) { |
17e5b4f2 | 526 | port->stats.bytes_discarded += buf->len - buf->offset; |
2d24cdaa | 527 | if (add_inbuf(port->in_vq, buf) < 0) { |
ce072a0c | 528 | err++; |
1b637046 | 529 | free_buf(buf, false); |
d6933561 | 530 | } |
2d24cdaa AS |
531 | port->inbuf = NULL; |
532 | buf = get_inbuf(port); | |
88f251ac | 533 | } |
ce072a0c | 534 | if (err) |
d6933561 | 535 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", |
ce072a0c | 536 | err); |
88f251ac AS |
537 | } |
538 | ||
203baab8 AS |
539 | static bool port_has_data(struct port *port) |
540 | { | |
541 | unsigned long flags; | |
542 | bool ret; | |
543 | ||
d25a9dda | 544 | ret = false; |
203baab8 | 545 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 546 | port->inbuf = get_inbuf(port); |
d25a9dda | 547 | if (port->inbuf) |
d6933561 | 548 | ret = true; |
d25a9dda | 549 | |
203baab8 | 550 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
551 | return ret; |
552 | } | |
553 | ||
3425e706 AS |
554 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
555 | unsigned int event, unsigned int value) | |
17634ba2 AS |
556 | { |
557 | struct scatterlist sg[1]; | |
558 | struct virtio_console_control cpkt; | |
559 | struct virtqueue *vq; | |
604b2ad7 | 560 | unsigned int len; |
17634ba2 | 561 | |
3425e706 | 562 | if (!use_multiport(portdev)) |
17634ba2 AS |
563 | return 0; |
564 | ||
3425e706 | 565 | cpkt.id = port_id; |
17634ba2 AS |
566 | cpkt.event = event; |
567 | cpkt.value = value; | |
568 | ||
3425e706 | 569 | vq = portdev->c_ovq; |
17634ba2 AS |
570 | |
571 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
589575a2 | 572 | if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt, GFP_ATOMIC) == 0) { |
505b0451 MT |
573 | virtqueue_kick(vq); |
574 | while (!virtqueue_get_buf(vq, &len)) | |
17634ba2 AS |
575 | cpu_relax(); |
576 | } | |
577 | return 0; | |
578 | } | |
579 | ||
3425e706 AS |
580 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
581 | unsigned int value) | |
582 | { | |
84ec06c5 AS |
583 | /* Did the port get unplugged before userspace closed it? */ |
584 | if (port->portdev) | |
585 | return __send_control_msg(port->portdev, port->id, event, value); | |
586 | return 0; | |
3425e706 AS |
587 | } |
588 | ||
eb5e89fc | 589 | |
cdfadfc1 AS |
590 | /* Callers must take the port->outvq_lock */ |
591 | static void reclaim_consumed_buffers(struct port *port) | |
592 | { | |
276a3e95 | 593 | struct port_buffer *buf; |
cdfadfc1 AS |
594 | unsigned int len; |
595 | ||
d7a62cd0 AS |
596 | if (!port->portdev) { |
597 | /* Device has been unplugged. vqs are already gone. */ | |
598 | return; | |
599 | } | |
276a3e95 | 600 | while ((buf = virtqueue_get_buf(port->out_vq, &len))) { |
1b637046 | 601 | free_buf(buf, false); |
cdfadfc1 AS |
602 | port->outvq_full = false; |
603 | } | |
604 | } | |
605 | ||
eb5e89fc MH |
606 | static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, |
607 | int nents, size_t in_count, | |
276a3e95 | 608 | void *data, bool nonblock) |
f997f00b | 609 | { |
f997f00b | 610 | struct virtqueue *out_vq; |
589575a2 | 611 | int err; |
cdfadfc1 | 612 | unsigned long flags; |
f997f00b AS |
613 | unsigned int len; |
614 | ||
615 | out_vq = port->out_vq; | |
616 | ||
cdfadfc1 AS |
617 | spin_lock_irqsave(&port->outvq_lock, flags); |
618 | ||
619 | reclaim_consumed_buffers(port); | |
620 | ||
276a3e95 | 621 | err = virtqueue_add_buf(out_vq, sg, nents, 0, data, GFP_ATOMIC); |
f997f00b AS |
622 | |
623 | /* Tell Host to go! */ | |
505b0451 | 624 | virtqueue_kick(out_vq); |
f997f00b | 625 | |
589575a2 | 626 | if (err) { |
9ff4cfab | 627 | in_count = 0; |
cdfadfc1 | 628 | goto done; |
f997f00b AS |
629 | } |
630 | ||
589575a2 | 631 | if (out_vq->num_free == 0) |
cdfadfc1 AS |
632 | port->outvq_full = true; |
633 | ||
634 | if (nonblock) | |
635 | goto done; | |
636 | ||
637 | /* | |
638 | * Wait till the host acknowledges it pushed out the data we | |
531295e6 AS |
639 | * sent. This is done for data from the hvc_console; the tty |
640 | * operations are performed with spinlocks held so we can't | |
641 | * sleep here. An alternative would be to copy the data to a | |
642 | * buffer and relax the spinning requirement. The downside is | |
643 | * we need to kmalloc a GFP_ATOMIC buffer each time the | |
644 | * console driver writes something out. | |
cdfadfc1 | 645 | */ |
505b0451 | 646 | while (!virtqueue_get_buf(out_vq, &len)) |
f997f00b | 647 | cpu_relax(); |
cdfadfc1 AS |
648 | done: |
649 | spin_unlock_irqrestore(&port->outvq_lock, flags); | |
17e5b4f2 AS |
650 | |
651 | port->stats.bytes_sent += in_count; | |
cdfadfc1 AS |
652 | /* |
653 | * We're expected to return the amount of data we wrote -- all | |
654 | * of it | |
655 | */ | |
9ff4cfab | 656 | return in_count; |
f997f00b AS |
657 | } |
658 | ||
203baab8 AS |
659 | /* |
660 | * Give out the data that's requested from the buffer that we have | |
661 | * queued up. | |
662 | */ | |
b766ceed AS |
663 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
664 | bool to_user) | |
203baab8 AS |
665 | { |
666 | struct port_buffer *buf; | |
667 | unsigned long flags; | |
668 | ||
669 | if (!out_count || !port_has_data(port)) | |
670 | return 0; | |
671 | ||
672 | buf = port->inbuf; | |
b766ceed | 673 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 674 | |
b766ceed AS |
675 | if (to_user) { |
676 | ssize_t ret; | |
677 | ||
678 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
679 | if (ret) | |
680 | return -EFAULT; | |
681 | } else { | |
682 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
683 | } | |
203baab8 | 684 | |
203baab8 AS |
685 | buf->offset += out_count; |
686 | ||
687 | if (buf->offset == buf->len) { | |
688 | /* | |
689 | * We're done using all the data in this buffer. | |
690 | * Re-queue so that the Host can send us more data. | |
691 | */ | |
692 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
693 | port->inbuf = NULL; | |
694 | ||
695 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 696 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
697 | |
698 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
699 | } | |
b766ceed | 700 | /* Return the number of bytes actually copied */ |
203baab8 | 701 | return out_count; |
e27b5198 AS |
702 | } |
703 | ||
2030fa49 | 704 | /* The condition that must be true for polling to end */ |
60caacd3 | 705 | static bool will_read_block(struct port *port) |
2030fa49 | 706 | { |
3709ea7a AS |
707 | if (!port->guest_connected) { |
708 | /* Port got hot-unplugged. Let's exit. */ | |
709 | return false; | |
710 | } | |
60caacd3 | 711 | return !port_has_data(port) && port->host_connected; |
2030fa49 AS |
712 | } |
713 | ||
cdfadfc1 AS |
714 | static bool will_write_block(struct port *port) |
715 | { | |
716 | bool ret; | |
717 | ||
60e5e0b8 AS |
718 | if (!port->guest_connected) { |
719 | /* Port got hot-unplugged. Let's exit. */ | |
720 | return false; | |
721 | } | |
cdfadfc1 AS |
722 | if (!port->host_connected) |
723 | return true; | |
724 | ||
725 | spin_lock_irq(&port->outvq_lock); | |
726 | /* | |
727 | * Check if the Host has consumed any buffers since we last | |
728 | * sent data (this is only applicable for nonblocking ports). | |
729 | */ | |
730 | reclaim_consumed_buffers(port); | |
731 | ret = port->outvq_full; | |
732 | spin_unlock_irq(&port->outvq_lock); | |
733 | ||
734 | return ret; | |
735 | } | |
736 | ||
2030fa49 AS |
737 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, |
738 | size_t count, loff_t *offp) | |
739 | { | |
740 | struct port *port; | |
741 | ssize_t ret; | |
742 | ||
743 | port = filp->private_data; | |
744 | ||
745 | if (!port_has_data(port)) { | |
746 | /* | |
747 | * If nothing's connected on the host just return 0 in | |
748 | * case of list_empty; this tells the userspace app | |
749 | * that there's no connection | |
750 | */ | |
751 | if (!port->host_connected) | |
752 | return 0; | |
753 | if (filp->f_flags & O_NONBLOCK) | |
754 | return -EAGAIN; | |
755 | ||
a08fa92d AS |
756 | ret = wait_event_freezable(port->waitqueue, |
757 | !will_read_block(port)); | |
2030fa49 AS |
758 | if (ret < 0) |
759 | return ret; | |
760 | } | |
b3dddb9e AS |
761 | /* Port got hot-unplugged. */ |
762 | if (!port->guest_connected) | |
763 | return -ENODEV; | |
2030fa49 AS |
764 | /* |
765 | * We could've received a disconnection message while we were | |
766 | * waiting for more data. | |
767 | * | |
768 | * This check is not clubbed in the if() statement above as we | |
769 | * might receive some data as well as the host could get | |
770 | * disconnected after we got woken up from our wait. So we | |
771 | * really want to give off whatever data we have and only then | |
772 | * check for host_connected. | |
773 | */ | |
774 | if (!port_has_data(port) && !port->host_connected) | |
775 | return 0; | |
776 | ||
777 | return fill_readbuf(port, ubuf, count, true); | |
778 | } | |
779 | ||
efe75d24 MH |
780 | static int wait_port_writable(struct port *port, bool nonblock) |
781 | { | |
782 | int ret; | |
783 | ||
784 | if (will_write_block(port)) { | |
785 | if (nonblock) | |
786 | return -EAGAIN; | |
787 | ||
788 | ret = wait_event_freezable(port->waitqueue, | |
789 | !will_write_block(port)); | |
790 | if (ret < 0) | |
791 | return ret; | |
792 | } | |
793 | /* Port got hot-unplugged. */ | |
794 | if (!port->guest_connected) | |
795 | return -ENODEV; | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
2030fa49 AS |
800 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, |
801 | size_t count, loff_t *offp) | |
802 | { | |
803 | struct port *port; | |
276a3e95 | 804 | struct port_buffer *buf; |
2030fa49 | 805 | ssize_t ret; |
cdfadfc1 | 806 | bool nonblock; |
276a3e95 | 807 | struct scatterlist sg[1]; |
2030fa49 | 808 | |
65745422 AS |
809 | /* Userspace could be out to fool us */ |
810 | if (!count) | |
811 | return 0; | |
812 | ||
2030fa49 AS |
813 | port = filp->private_data; |
814 | ||
cdfadfc1 AS |
815 | nonblock = filp->f_flags & O_NONBLOCK; |
816 | ||
efe75d24 MH |
817 | ret = wait_port_writable(port, nonblock); |
818 | if (ret < 0) | |
819 | return ret; | |
cdfadfc1 | 820 | |
2030fa49 AS |
821 | count = min((size_t)(32 * 1024), count); |
822 | ||
276a3e95 | 823 | buf = alloc_buf(port->out_vq, count, 0); |
2030fa49 AS |
824 | if (!buf) |
825 | return -ENOMEM; | |
826 | ||
276a3e95 | 827 | ret = copy_from_user(buf->buf, ubuf, count); |
2030fa49 AS |
828 | if (ret) { |
829 | ret = -EFAULT; | |
830 | goto free_buf; | |
831 | } | |
832 | ||
531295e6 AS |
833 | /* |
834 | * We now ask send_buf() to not spin for generic ports -- we | |
835 | * can re-use the same code path that non-blocking file | |
836 | * descriptors take for blocking file descriptors since the | |
837 | * wait is already done and we're certain the write will go | |
838 | * through to the host. | |
839 | */ | |
840 | nonblock = true; | |
276a3e95 SB |
841 | sg_init_one(sg, buf->buf, count); |
842 | ret = __send_to_port(port, sg, 1, count, buf, nonblock); | |
cdfadfc1 AS |
843 | |
844 | if (nonblock && ret > 0) | |
845 | goto out; | |
846 | ||
2030fa49 | 847 | free_buf: |
1b637046 | 848 | free_buf(buf, true); |
cdfadfc1 | 849 | out: |
2030fa49 AS |
850 | return ret; |
851 | } | |
852 | ||
eb5e89fc MH |
853 | struct sg_list { |
854 | unsigned int n; | |
8ca84a50 | 855 | unsigned int size; |
eb5e89fc MH |
856 | size_t len; |
857 | struct scatterlist *sg; | |
858 | }; | |
859 | ||
860 | static int pipe_to_sg(struct pipe_inode_info *pipe, struct pipe_buffer *buf, | |
861 | struct splice_desc *sd) | |
862 | { | |
863 | struct sg_list *sgl = sd->u.data; | |
ec8fc870 | 864 | unsigned int offset, len; |
eb5e89fc | 865 | |
8ca84a50 | 866 | if (sgl->n == sgl->size) |
eb5e89fc MH |
867 | return 0; |
868 | ||
869 | /* Try lock this page */ | |
870 | if (buf->ops->steal(pipe, buf) == 0) { | |
871 | /* Get reference and unlock page for moving */ | |
872 | get_page(buf->page); | |
873 | unlock_page(buf->page); | |
874 | ||
875 | len = min(buf->len, sd->len); | |
876 | sg_set_page(&(sgl->sg[sgl->n]), buf->page, len, buf->offset); | |
ec8fc870 MH |
877 | } else { |
878 | /* Failback to copying a page */ | |
879 | struct page *page = alloc_page(GFP_KERNEL); | |
880 | char *src = buf->ops->map(pipe, buf, 1); | |
881 | char *dst; | |
882 | ||
883 | if (!page) | |
884 | return -ENOMEM; | |
885 | dst = kmap(page); | |
886 | ||
887 | offset = sd->pos & ~PAGE_MASK; | |
888 | ||
889 | len = sd->len; | |
890 | if (len + offset > PAGE_SIZE) | |
891 | len = PAGE_SIZE - offset; | |
892 | ||
893 | memcpy(dst + offset, src + buf->offset, len); | |
894 | ||
895 | kunmap(page); | |
896 | buf->ops->unmap(pipe, buf, src); | |
897 | ||
898 | sg_set_page(&(sgl->sg[sgl->n]), page, len, offset); | |
eb5e89fc | 899 | } |
ec8fc870 MH |
900 | sgl->n++; |
901 | sgl->len += len; | |
eb5e89fc MH |
902 | |
903 | return len; | |
904 | } | |
905 | ||
906 | /* Faster zero-copy write by splicing */ | |
907 | static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, | |
908 | struct file *filp, loff_t *ppos, | |
909 | size_t len, unsigned int flags) | |
910 | { | |
911 | struct port *port = filp->private_data; | |
912 | struct sg_list sgl; | |
913 | ssize_t ret; | |
276a3e95 | 914 | struct port_buffer *buf; |
eb5e89fc MH |
915 | struct splice_desc sd = { |
916 | .total_len = len, | |
917 | .flags = flags, | |
918 | .pos = *ppos, | |
919 | .u.data = &sgl, | |
920 | }; | |
921 | ||
1b637046 SB |
922 | /* |
923 | * Rproc_serial does not yet support splice. To support splice | |
924 | * pipe_to_sg() must allocate dma-buffers and copy content from | |
925 | * regular pages to dma pages. And alloc_buf and free_buf must | |
926 | * support allocating and freeing such a list of dma-buffers. | |
927 | */ | |
928 | if (is_rproc_serial(port->out_vq->vdev)) | |
929 | return -EINVAL; | |
930 | ||
efe75d24 MH |
931 | ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK); |
932 | if (ret < 0) | |
933 | return ret; | |
934 | ||
276a3e95 SB |
935 | buf = alloc_buf(port->out_vq, 0, pipe->nrbufs); |
936 | if (!buf) | |
937 | return -ENOMEM; | |
938 | ||
eb5e89fc MH |
939 | sgl.n = 0; |
940 | sgl.len = 0; | |
8ca84a50 | 941 | sgl.size = pipe->nrbufs; |
276a3e95 | 942 | sgl.sg = buf->sg; |
8ca84a50 | 943 | sg_init_table(sgl.sg, sgl.size); |
eb5e89fc MH |
944 | ret = __splice_from_pipe(pipe, &sd, pipe_to_sg); |
945 | if (likely(ret > 0)) | |
276a3e95 | 946 | ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true); |
eb5e89fc | 947 | |
fe529537 | 948 | if (unlikely(ret <= 0)) |
1b637046 | 949 | free_buf(buf, true); |
eb5e89fc MH |
950 | return ret; |
951 | } | |
952 | ||
2030fa49 AS |
953 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) |
954 | { | |
955 | struct port *port; | |
956 | unsigned int ret; | |
957 | ||
958 | port = filp->private_data; | |
959 | poll_wait(filp, &port->waitqueue, wait); | |
960 | ||
8529a504 AS |
961 | if (!port->guest_connected) { |
962 | /* Port got unplugged */ | |
963 | return POLLHUP; | |
964 | } | |
2030fa49 | 965 | ret = 0; |
6df7aadc | 966 | if (!will_read_block(port)) |
2030fa49 | 967 | ret |= POLLIN | POLLRDNORM; |
cdfadfc1 | 968 | if (!will_write_block(port)) |
2030fa49 AS |
969 | ret |= POLLOUT; |
970 | if (!port->host_connected) | |
971 | ret |= POLLHUP; | |
972 | ||
973 | return ret; | |
974 | } | |
975 | ||
b353a6b8 AS |
976 | static void remove_port(struct kref *kref); |
977 | ||
2030fa49 AS |
978 | static int port_fops_release(struct inode *inode, struct file *filp) |
979 | { | |
980 | struct port *port; | |
981 | ||
982 | port = filp->private_data; | |
983 | ||
984 | /* Notify host of port being closed */ | |
985 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
986 | ||
88f251ac | 987 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
988 | port->guest_connected = false; |
989 | ||
88f251ac AS |
990 | discard_port_data(port); |
991 | ||
992 | spin_unlock_irq(&port->inbuf_lock); | |
993 | ||
cdfadfc1 AS |
994 | spin_lock_irq(&port->outvq_lock); |
995 | reclaim_consumed_buffers(port); | |
996 | spin_unlock_irq(&port->outvq_lock); | |
997 | ||
1b637046 | 998 | reclaim_dma_bufs(); |
b353a6b8 AS |
999 | /* |
1000 | * Locks aren't necessary here as a port can't be opened after | |
1001 | * unplug, and if a port isn't unplugged, a kref would already | |
1002 | * exist for the port. Plus, taking ports_lock here would | |
1003 | * create a dependency on other locks taken by functions | |
1004 | * inside remove_port if we're the last holder of the port, | |
1005 | * creating many problems. | |
1006 | */ | |
1007 | kref_put(&port->kref, remove_port); | |
1008 | ||
2030fa49 AS |
1009 | return 0; |
1010 | } | |
1011 | ||
1012 | static int port_fops_open(struct inode *inode, struct file *filp) | |
1013 | { | |
1014 | struct cdev *cdev = inode->i_cdev; | |
1015 | struct port *port; | |
8ad37e83 | 1016 | int ret; |
2030fa49 | 1017 | |
04950cdf | 1018 | port = find_port_by_devt(cdev->dev); |
2030fa49 AS |
1019 | filp->private_data = port; |
1020 | ||
b353a6b8 AS |
1021 | /* Prevent against a port getting hot-unplugged at the same time */ |
1022 | spin_lock_irq(&port->portdev->ports_lock); | |
1023 | kref_get(&port->kref); | |
1024 | spin_unlock_irq(&port->portdev->ports_lock); | |
1025 | ||
2030fa49 AS |
1026 | /* |
1027 | * Don't allow opening of console port devices -- that's done | |
1028 | * via /dev/hvc | |
1029 | */ | |
8ad37e83 AS |
1030 | if (is_console_port(port)) { |
1031 | ret = -ENXIO; | |
1032 | goto out; | |
1033 | } | |
2030fa49 | 1034 | |
3c7969cc AS |
1035 | /* Allow only one process to open a particular port at a time */ |
1036 | spin_lock_irq(&port->inbuf_lock); | |
1037 | if (port->guest_connected) { | |
1038 | spin_unlock_irq(&port->inbuf_lock); | |
8ad37e83 AS |
1039 | ret = -EMFILE; |
1040 | goto out; | |
3c7969cc AS |
1041 | } |
1042 | ||
1043 | port->guest_connected = true; | |
1044 | spin_unlock_irq(&port->inbuf_lock); | |
1045 | ||
cdfadfc1 AS |
1046 | spin_lock_irq(&port->outvq_lock); |
1047 | /* | |
1048 | * There might be a chance that we missed reclaiming a few | |
1049 | * buffers in the window of the port getting previously closed | |
1050 | * and opening now. | |
1051 | */ | |
1052 | reclaim_consumed_buffers(port); | |
1053 | spin_unlock_irq(&port->outvq_lock); | |
1054 | ||
299fb61c AS |
1055 | nonseekable_open(inode, filp); |
1056 | ||
2030fa49 AS |
1057 | /* Notify host of port being opened */ |
1058 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1059 | ||
1060 | return 0; | |
8ad37e83 | 1061 | out: |
b353a6b8 | 1062 | kref_put(&port->kref, remove_port); |
8ad37e83 | 1063 | return ret; |
2030fa49 AS |
1064 | } |
1065 | ||
3eae0ade AS |
1066 | static int port_fops_fasync(int fd, struct file *filp, int mode) |
1067 | { | |
1068 | struct port *port; | |
1069 | ||
1070 | port = filp->private_data; | |
1071 | return fasync_helper(fd, filp, mode, &port->async_queue); | |
1072 | } | |
1073 | ||
2030fa49 AS |
1074 | /* |
1075 | * The file operations that we support: programs in the guest can open | |
1076 | * a console device, read from it, write to it, poll for data and | |
1077 | * close it. The devices are at | |
1078 | * /dev/vport<device number>p<port number> | |
1079 | */ | |
1080 | static const struct file_operations port_fops = { | |
1081 | .owner = THIS_MODULE, | |
1082 | .open = port_fops_open, | |
1083 | .read = port_fops_read, | |
1084 | .write = port_fops_write, | |
eb5e89fc | 1085 | .splice_write = port_fops_splice_write, |
2030fa49 AS |
1086 | .poll = port_fops_poll, |
1087 | .release = port_fops_release, | |
3eae0ade | 1088 | .fasync = port_fops_fasync, |
299fb61c | 1089 | .llseek = no_llseek, |
2030fa49 AS |
1090 | }; |
1091 | ||
a23ea924 RR |
1092 | /* |
1093 | * The put_chars() callback is pretty straightforward. | |
31610434 | 1094 | * |
a23ea924 RR |
1095 | * We turn the characters into a scatter-gather list, add it to the |
1096 | * output queue and then kick the Host. Then we sit here waiting for | |
1097 | * it to finish: inefficient in theory, but in practice | |
1098 | * implementations will do it immediately (lguest's Launcher does). | |
1099 | */ | |
31610434 RR |
1100 | static int put_chars(u32 vtermno, const char *buf, int count) |
1101 | { | |
21206ede | 1102 | struct port *port; |
276a3e95 | 1103 | struct scatterlist sg[1]; |
38edf58d | 1104 | |
162a689a FD |
1105 | if (unlikely(early_put_chars)) |
1106 | return early_put_chars(vtermno, buf, count); | |
1107 | ||
38edf58d AS |
1108 | port = find_port_by_vtermno(vtermno); |
1109 | if (!port) | |
6dc69f97 | 1110 | return -EPIPE; |
31610434 | 1111 | |
276a3e95 SB |
1112 | sg_init_one(sg, buf, count); |
1113 | return __send_to_port(port, sg, 1, count, (void *)buf, false); | |
31610434 RR |
1114 | } |
1115 | ||
a23ea924 RR |
1116 | /* |
1117 | * get_chars() is the callback from the hvc_console infrastructure | |
1118 | * when an interrupt is received. | |
31610434 | 1119 | * |
203baab8 AS |
1120 | * We call out to fill_readbuf that gets us the required data from the |
1121 | * buffers that are queued up. | |
a23ea924 | 1122 | */ |
31610434 RR |
1123 | static int get_chars(u32 vtermno, char *buf, int count) |
1124 | { | |
21206ede RR |
1125 | struct port *port; |
1126 | ||
6dc69f97 AS |
1127 | /* If we've not set up the port yet, we have no input to give. */ |
1128 | if (unlikely(early_put_chars)) | |
1129 | return 0; | |
1130 | ||
38edf58d AS |
1131 | port = find_port_by_vtermno(vtermno); |
1132 | if (!port) | |
6dc69f97 | 1133 | return -EPIPE; |
21206ede | 1134 | |
31610434 | 1135 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 1136 | BUG_ON(!port->in_vq); |
31610434 | 1137 | |
b766ceed | 1138 | return fill_readbuf(port, buf, count, false); |
31610434 | 1139 | } |
31610434 | 1140 | |
cb06e367 | 1141 | static void resize_console(struct port *port) |
c2983458 | 1142 | { |
cb06e367 | 1143 | struct virtio_device *vdev; |
c2983458 | 1144 | |
2de16a49 | 1145 | /* The port could have been hot-unplugged */ |
9778829c | 1146 | if (!port || !is_console_port(port)) |
2de16a49 AS |
1147 | return; |
1148 | ||
cb06e367 | 1149 | vdev = port->portdev->vdev; |
1b637046 SB |
1150 | |
1151 | /* Don't test F_SIZE at all if we're rproc: not a valid feature! */ | |
1152 | if (!is_rproc_serial(vdev) && | |
1153 | virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) | |
9778829c | 1154 | hvc_resize(port->cons.hvc, port->cons.ws); |
c2983458 CB |
1155 | } |
1156 | ||
38edf58d | 1157 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
1158 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
1159 | { | |
38edf58d AS |
1160 | struct port *port; |
1161 | ||
1162 | port = find_port_by_vtermno(hp->vtermno); | |
1163 | if (!port) | |
1164 | return -EINVAL; | |
1165 | ||
91fcad19 | 1166 | hp->irq_requested = 1; |
cb06e367 | 1167 | resize_console(port); |
c2983458 | 1168 | |
91fcad19 CB |
1169 | return 0; |
1170 | } | |
1171 | ||
1172 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
1173 | { | |
1174 | hp->irq_requested = 0; | |
1175 | } | |
1176 | ||
17634ba2 | 1177 | /* The operations for console ports. */ |
1dff3996 | 1178 | static const struct hv_ops hv_ops = { |
971f3390 RR |
1179 | .get_chars = get_chars, |
1180 | .put_chars = put_chars, | |
1181 | .notifier_add = notifier_add_vio, | |
1182 | .notifier_del = notifier_del_vio, | |
1183 | .notifier_hangup = notifier_del_vio, | |
1184 | }; | |
1185 | ||
1186 | /* | |
1187 | * Console drivers are initialized very early so boot messages can go | |
1188 | * out, so we do things slightly differently from the generic virtio | |
1189 | * initialization of the net and block drivers. | |
1190 | * | |
1191 | * At this stage, the console is output-only. It's too early to set | |
1192 | * up a virtqueue, so we let the drivers do some boutique early-output | |
1193 | * thing. | |
1194 | */ | |
1195 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
1196 | { | |
1197 | early_put_chars = put_chars; | |
1198 | return hvc_instantiate(0, 0, &hv_ops); | |
1199 | } | |
1200 | ||
17634ba2 | 1201 | int init_port_console(struct port *port) |
cfa6d379 AS |
1202 | { |
1203 | int ret; | |
1204 | ||
1205 | /* | |
1206 | * The Host's telling us this port is a console port. Hook it | |
1207 | * up with an hvc console. | |
1208 | * | |
1209 | * To set up and manage our virtual console, we call | |
1210 | * hvc_alloc(). | |
1211 | * | |
1212 | * The first argument of hvc_alloc() is the virtual console | |
1213 | * number. The second argument is the parameter for the | |
1214 | * notification mechanism (like irq number). We currently | |
1215 | * leave this as zero, virtqueues have implicit notifications. | |
1216 | * | |
1217 | * The third argument is a "struct hv_ops" containing the | |
1218 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
1219 | * pointers. The final argument is the output buffer size: we | |
1220 | * can do any size, so we put PAGE_SIZE here. | |
1221 | */ | |
1222 | port->cons.vtermno = pdrvdata.next_vtermno; | |
1223 | ||
1224 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
1225 | if (IS_ERR(port->cons.hvc)) { | |
1226 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
1227 | dev_err(port->dev, |
1228 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
1229 | port->cons.hvc = NULL; |
1230 | return ret; | |
1231 | } | |
1232 | spin_lock_irq(&pdrvdata_lock); | |
1233 | pdrvdata.next_vtermno++; | |
1234 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
1235 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 1236 | port->guest_connected = true; |
cfa6d379 | 1237 | |
1d05160b AS |
1238 | /* |
1239 | * Start using the new console output if this is the first | |
1240 | * console to come up. | |
1241 | */ | |
1242 | if (early_put_chars) | |
1243 | early_put_chars = NULL; | |
1244 | ||
2030fa49 AS |
1245 | /* Notify host of port being opened */ |
1246 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1247 | ||
cfa6d379 AS |
1248 | return 0; |
1249 | } | |
1250 | ||
431edb8a AS |
1251 | static ssize_t show_port_name(struct device *dev, |
1252 | struct device_attribute *attr, char *buffer) | |
1253 | { | |
1254 | struct port *port; | |
1255 | ||
1256 | port = dev_get_drvdata(dev); | |
1257 | ||
1258 | return sprintf(buffer, "%s\n", port->name); | |
1259 | } | |
1260 | ||
1261 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
1262 | ||
1263 | static struct attribute *port_sysfs_entries[] = { | |
1264 | &dev_attr_name.attr, | |
1265 | NULL | |
1266 | }; | |
1267 | ||
1268 | static struct attribute_group port_attribute_group = { | |
1269 | .name = NULL, /* put in device directory */ | |
1270 | .attrs = port_sysfs_entries, | |
1271 | }; | |
1272 | ||
d99393ef AS |
1273 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, |
1274 | size_t count, loff_t *offp) | |
1275 | { | |
1276 | struct port *port; | |
1277 | char *buf; | |
1278 | ssize_t ret, out_offset, out_count; | |
1279 | ||
1280 | out_count = 1024; | |
1281 | buf = kmalloc(out_count, GFP_KERNEL); | |
1282 | if (!buf) | |
1283 | return -ENOMEM; | |
1284 | ||
1285 | port = filp->private_data; | |
1286 | out_offset = 0; | |
1287 | out_offset += snprintf(buf + out_offset, out_count, | |
1288 | "name: %s\n", port->name ? port->name : ""); | |
1289 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1290 | "guest_connected: %d\n", port->guest_connected); | |
1291 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1292 | "host_connected: %d\n", port->host_connected); | |
cdfadfc1 AS |
1293 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1294 | "outvq_full: %d\n", port->outvq_full); | |
17e5b4f2 AS |
1295 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1296 | "bytes_sent: %lu\n", port->stats.bytes_sent); | |
1297 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1298 | "bytes_received: %lu\n", | |
1299 | port->stats.bytes_received); | |
1300 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1301 | "bytes_discarded: %lu\n", | |
1302 | port->stats.bytes_discarded); | |
d99393ef AS |
1303 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1304 | "is_console: %s\n", | |
1305 | is_console_port(port) ? "yes" : "no"); | |
1306 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1307 | "console_vtermno: %u\n", port->cons.vtermno); | |
1308 | ||
1309 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
1310 | kfree(buf); | |
1311 | return ret; | |
1312 | } | |
1313 | ||
1314 | static const struct file_operations port_debugfs_ops = { | |
1315 | .owner = THIS_MODULE, | |
234e3405 | 1316 | .open = simple_open, |
d99393ef AS |
1317 | .read = debugfs_read, |
1318 | }; | |
1319 | ||
9778829c AS |
1320 | static void set_console_size(struct port *port, u16 rows, u16 cols) |
1321 | { | |
1322 | if (!port || !is_console_port(port)) | |
1323 | return; | |
1324 | ||
1325 | port->cons.ws.ws_row = rows; | |
1326 | port->cons.ws.ws_col = cols; | |
1327 | } | |
1328 | ||
c446f8fc AS |
1329 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
1330 | { | |
1331 | struct port_buffer *buf; | |
1332 | unsigned int nr_added_bufs; | |
1333 | int ret; | |
1334 | ||
1335 | nr_added_bufs = 0; | |
1336 | do { | |
276a3e95 | 1337 | buf = alloc_buf(vq, PAGE_SIZE, 0); |
c446f8fc AS |
1338 | if (!buf) |
1339 | break; | |
1340 | ||
1341 | spin_lock_irq(lock); | |
1342 | ret = add_inbuf(vq, buf); | |
1343 | if (ret < 0) { | |
1344 | spin_unlock_irq(lock); | |
1b637046 | 1345 | free_buf(buf, true); |
c446f8fc AS |
1346 | break; |
1347 | } | |
1348 | nr_added_bufs++; | |
1349 | spin_unlock_irq(lock); | |
1350 | } while (ret > 0); | |
1351 | ||
1352 | return nr_added_bufs; | |
1353 | } | |
1354 | ||
3eae0ade AS |
1355 | static void send_sigio_to_port(struct port *port) |
1356 | { | |
1357 | if (port->async_queue && port->guest_connected) | |
1358 | kill_fasync(&port->async_queue, SIGIO, POLL_OUT); | |
1359 | } | |
1360 | ||
c446f8fc AS |
1361 | static int add_port(struct ports_device *portdev, u32 id) |
1362 | { | |
1363 | char debugfs_name[16]; | |
1364 | struct port *port; | |
1365 | struct port_buffer *buf; | |
1366 | dev_t devt; | |
1367 | unsigned int nr_added_bufs; | |
1368 | int err; | |
1369 | ||
1370 | port = kmalloc(sizeof(*port), GFP_KERNEL); | |
1371 | if (!port) { | |
1372 | err = -ENOMEM; | |
1373 | goto fail; | |
1374 | } | |
b353a6b8 | 1375 | kref_init(&port->kref); |
c446f8fc AS |
1376 | |
1377 | port->portdev = portdev; | |
1378 | port->id = id; | |
1379 | ||
1380 | port->name = NULL; | |
1381 | port->inbuf = NULL; | |
1382 | port->cons.hvc = NULL; | |
3eae0ade | 1383 | port->async_queue = NULL; |
c446f8fc | 1384 | |
9778829c AS |
1385 | port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
1386 | ||
c446f8fc | 1387 | port->host_connected = port->guest_connected = false; |
17e5b4f2 | 1388 | port->stats = (struct port_stats) { 0 }; |
c446f8fc | 1389 | |
cdfadfc1 AS |
1390 | port->outvq_full = false; |
1391 | ||
c446f8fc AS |
1392 | port->in_vq = portdev->in_vqs[port->id]; |
1393 | port->out_vq = portdev->out_vqs[port->id]; | |
1394 | ||
d22a6989 AS |
1395 | port->cdev = cdev_alloc(); |
1396 | if (!port->cdev) { | |
1397 | dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); | |
1398 | err = -ENOMEM; | |
1399 | goto free_port; | |
1400 | } | |
1401 | port->cdev->ops = &port_fops; | |
c446f8fc AS |
1402 | |
1403 | devt = MKDEV(portdev->chr_major, id); | |
d22a6989 | 1404 | err = cdev_add(port->cdev, devt, 1); |
c446f8fc AS |
1405 | if (err < 0) { |
1406 | dev_err(&port->portdev->vdev->dev, | |
1407 | "Error %d adding cdev for port %u\n", err, id); | |
d22a6989 | 1408 | goto free_cdev; |
c446f8fc AS |
1409 | } |
1410 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1411 | devt, port, "vport%up%u", | |
dc18f080 | 1412 | port->portdev->vdev->index, id); |
c446f8fc AS |
1413 | if (IS_ERR(port->dev)) { |
1414 | err = PTR_ERR(port->dev); | |
1415 | dev_err(&port->portdev->vdev->dev, | |
1416 | "Error %d creating device for port %u\n", | |
1417 | err, id); | |
1418 | goto free_cdev; | |
1419 | } | |
1420 | ||
1421 | spin_lock_init(&port->inbuf_lock); | |
cdfadfc1 | 1422 | spin_lock_init(&port->outvq_lock); |
c446f8fc AS |
1423 | init_waitqueue_head(&port->waitqueue); |
1424 | ||
1425 | /* Fill the in_vq with buffers so the host can send us data. */ | |
1426 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); | |
1427 | if (!nr_added_bufs) { | |
1428 | dev_err(port->dev, "Error allocating inbufs\n"); | |
1429 | err = -ENOMEM; | |
1430 | goto free_device; | |
1431 | } | |
1432 | ||
1b637046 SB |
1433 | if (is_rproc_serial(port->portdev->vdev)) |
1434 | /* | |
1435 | * For rproc_serial assume remote processor is connected. | |
1436 | * rproc_serial does not want the console port, only | |
1437 | * the generic port implementation. | |
1438 | */ | |
8078db78 | 1439 | port->host_connected = port->guest_connected = true; |
1b637046 SB |
1440 | else if (!use_multiport(port->portdev)) { |
1441 | /* | |
1442 | * If we're not using multiport support, | |
1443 | * this has to be a console port. | |
1444 | */ | |
c446f8fc AS |
1445 | err = init_port_console(port); |
1446 | if (err) | |
1447 | goto free_inbufs; | |
1448 | } | |
1449 | ||
1450 | spin_lock_irq(&portdev->ports_lock); | |
1451 | list_add_tail(&port->list, &port->portdev->ports); | |
1452 | spin_unlock_irq(&portdev->ports_lock); | |
1453 | ||
1454 | /* | |
1455 | * Tell the Host we're set so that it can send us various | |
1456 | * configuration parameters for this port (eg, port name, | |
1457 | * caching, whether this is a console port, etc.) | |
1458 | */ | |
1459 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
1460 | ||
1461 | if (pdrvdata.debugfs_dir) { | |
1462 | /* | |
1463 | * Finally, create the debugfs file that we can use to | |
1464 | * inspect a port's state at any time | |
1465 | */ | |
1466 | sprintf(debugfs_name, "vport%up%u", | |
dc18f080 | 1467 | port->portdev->vdev->index, id); |
c446f8fc AS |
1468 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, |
1469 | pdrvdata.debugfs_dir, | |
1470 | port, | |
1471 | &port_debugfs_ops); | |
1472 | } | |
1473 | return 0; | |
1474 | ||
1475 | free_inbufs: | |
1476 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1b637046 | 1477 | free_buf(buf, true); |
c446f8fc AS |
1478 | free_device: |
1479 | device_destroy(pdrvdata.class, port->dev->devt); | |
1480 | free_cdev: | |
d22a6989 | 1481 | cdev_del(port->cdev); |
c446f8fc AS |
1482 | free_port: |
1483 | kfree(port); | |
1484 | fail: | |
1485 | /* The host might want to notify management sw about port add failure */ | |
0643e4c6 | 1486 | __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
c446f8fc AS |
1487 | return err; |
1488 | } | |
1489 | ||
b353a6b8 AS |
1490 | /* No users remain, remove all port-specific data. */ |
1491 | static void remove_port(struct kref *kref) | |
1492 | { | |
1493 | struct port *port; | |
1494 | ||
1495 | port = container_of(kref, struct port, kref); | |
1496 | ||
1497 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); | |
1498 | device_destroy(pdrvdata.class, port->dev->devt); | |
1499 | cdev_del(port->cdev); | |
1500 | ||
1501 | kfree(port->name); | |
1502 | ||
1503 | debugfs_remove(port->debugfs_file); | |
1504 | ||
1505 | kfree(port); | |
1506 | } | |
1507 | ||
a0e2dbfc AS |
1508 | static void remove_port_data(struct port *port) |
1509 | { | |
1510 | struct port_buffer *buf; | |
1511 | ||
1512 | /* Remove unused data this port might have received. */ | |
1513 | discard_port_data(port); | |
1514 | ||
1515 | reclaim_consumed_buffers(port); | |
1516 | ||
1517 | /* Remove buffers we queued up for the Host to send us data in. */ | |
1518 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1b637046 | 1519 | free_buf(buf, true); |
eb34f12b | 1520 | |
1521 | /* Free pending buffers from the out-queue. */ | |
1522 | while ((buf = virtqueue_detach_unused_buf(port->out_vq))) | |
1b637046 | 1523 | free_buf(buf, true); |
a0e2dbfc AS |
1524 | } |
1525 | ||
b353a6b8 AS |
1526 | /* |
1527 | * Port got unplugged. Remove port from portdev's list and drop the | |
1528 | * kref reference. If no userspace has this port opened, it will | |
1529 | * result in immediate removal the port. | |
1530 | */ | |
1531 | static void unplug_port(struct port *port) | |
1f7aa42d | 1532 | { |
b353a6b8 AS |
1533 | spin_lock_irq(&port->portdev->ports_lock); |
1534 | list_del(&port->list); | |
1535 | spin_unlock_irq(&port->portdev->ports_lock); | |
1536 | ||
0047634d AS |
1537 | if (port->guest_connected) { |
1538 | port->guest_connected = false; | |
1539 | port->host_connected = false; | |
1540 | wake_up_interruptible(&port->waitqueue); | |
a461e11e AS |
1541 | |
1542 | /* Let the app know the port is going down. */ | |
1543 | send_sigio_to_port(port); | |
0047634d AS |
1544 | } |
1545 | ||
1f7aa42d AS |
1546 | if (is_console_port(port)) { |
1547 | spin_lock_irq(&pdrvdata_lock); | |
1548 | list_del(&port->cons.list); | |
1549 | spin_unlock_irq(&pdrvdata_lock); | |
1550 | hvc_remove(port->cons.hvc); | |
1551 | } | |
1f7aa42d | 1552 | |
a0e2dbfc | 1553 | remove_port_data(port); |
a9cdd485 | 1554 | |
b353a6b8 AS |
1555 | /* |
1556 | * We should just assume the device itself has gone off -- | |
1557 | * else a close on an open port later will try to send out a | |
1558 | * control message. | |
1559 | */ | |
1560 | port->portdev = NULL; | |
d99393ef | 1561 | |
b353a6b8 AS |
1562 | /* |
1563 | * Locks around here are not necessary - a port can't be | |
1564 | * opened after we removed the port struct from ports_list | |
1565 | * above. | |
1566 | */ | |
1567 | kref_put(&port->kref, remove_port); | |
1f7aa42d AS |
1568 | } |
1569 | ||
17634ba2 AS |
1570 | /* Any private messages that the Host and Guest want to share */ |
1571 | static void handle_control_message(struct ports_device *portdev, | |
1572 | struct port_buffer *buf) | |
1573 | { | |
1574 | struct virtio_console_control *cpkt; | |
1575 | struct port *port; | |
431edb8a AS |
1576 | size_t name_size; |
1577 | int err; | |
17634ba2 AS |
1578 | |
1579 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
1580 | ||
1581 | port = find_port_by_id(portdev, cpkt->id); | |
f909f850 | 1582 | if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) { |
17634ba2 AS |
1583 | /* No valid header at start of buffer. Drop it. */ |
1584 | dev_dbg(&portdev->vdev->dev, | |
1585 | "Invalid index %u in control packet\n", cpkt->id); | |
1586 | return; | |
1587 | } | |
1588 | ||
1589 | switch (cpkt->event) { | |
f909f850 AS |
1590 | case VIRTIO_CONSOLE_PORT_ADD: |
1591 | if (port) { | |
1d05160b AS |
1592 | dev_dbg(&portdev->vdev->dev, |
1593 | "Port %u already added\n", port->id); | |
f909f850 AS |
1594 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
1595 | break; | |
1596 | } | |
1597 | if (cpkt->id >= portdev->config.max_nr_ports) { | |
1598 | dev_warn(&portdev->vdev->dev, | |
1599 | "Request for adding port with out-of-bound id %u, max. supported id: %u\n", | |
1600 | cpkt->id, portdev->config.max_nr_ports - 1); | |
1601 | break; | |
1602 | } | |
1603 | add_port(portdev, cpkt->id); | |
1604 | break; | |
1605 | case VIRTIO_CONSOLE_PORT_REMOVE: | |
b353a6b8 | 1606 | unplug_port(port); |
f909f850 | 1607 | break; |
17634ba2 AS |
1608 | case VIRTIO_CONSOLE_CONSOLE_PORT: |
1609 | if (!cpkt->value) | |
1610 | break; | |
1611 | if (is_console_port(port)) | |
1612 | break; | |
1613 | ||
1614 | init_port_console(port); | |
5e38483b | 1615 | complete(&early_console_added); |
17634ba2 AS |
1616 | /* |
1617 | * Could remove the port here in case init fails - but | |
1618 | * have to notify the host first. | |
1619 | */ | |
1620 | break; | |
8345adbf AS |
1621 | case VIRTIO_CONSOLE_RESIZE: { |
1622 | struct { | |
1623 | __u16 rows; | |
1624 | __u16 cols; | |
1625 | } size; | |
1626 | ||
17634ba2 AS |
1627 | if (!is_console_port(port)) |
1628 | break; | |
8345adbf AS |
1629 | |
1630 | memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), | |
1631 | sizeof(size)); | |
1632 | set_console_size(port, size.rows, size.cols); | |
1633 | ||
17634ba2 AS |
1634 | port->cons.hvc->irq_requested = 1; |
1635 | resize_console(port); | |
1636 | break; | |
8345adbf | 1637 | } |
2030fa49 AS |
1638 | case VIRTIO_CONSOLE_PORT_OPEN: |
1639 | port->host_connected = cpkt->value; | |
1640 | wake_up_interruptible(&port->waitqueue); | |
cdfadfc1 AS |
1641 | /* |
1642 | * If the host port got closed and the host had any | |
1643 | * unconsumed buffers, we'll be able to reclaim them | |
1644 | * now. | |
1645 | */ | |
1646 | spin_lock_irq(&port->outvq_lock); | |
1647 | reclaim_consumed_buffers(port); | |
1648 | spin_unlock_irq(&port->outvq_lock); | |
3eae0ade AS |
1649 | |
1650 | /* | |
1651 | * If the guest is connected, it'll be interested in | |
1652 | * knowing the host connection state changed. | |
1653 | */ | |
1654 | send_sigio_to_port(port); | |
2030fa49 | 1655 | break; |
431edb8a | 1656 | case VIRTIO_CONSOLE_PORT_NAME: |
291024ef AS |
1657 | /* |
1658 | * If we woke up after hibernation, we can get this | |
1659 | * again. Skip it in that case. | |
1660 | */ | |
1661 | if (port->name) | |
1662 | break; | |
1663 | ||
431edb8a AS |
1664 | /* |
1665 | * Skip the size of the header and the cpkt to get the size | |
1666 | * of the name that was sent | |
1667 | */ | |
1668 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
1669 | ||
1670 | port->name = kmalloc(name_size, GFP_KERNEL); | |
1671 | if (!port->name) { | |
1672 | dev_err(port->dev, | |
1673 | "Not enough space to store port name\n"); | |
1674 | break; | |
1675 | } | |
1676 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
1677 | name_size - 1); | |
1678 | port->name[name_size - 1] = 0; | |
1679 | ||
1680 | /* | |
1681 | * Since we only have one sysfs attribute, 'name', | |
1682 | * create it only if we have a name for the port. | |
1683 | */ | |
1684 | err = sysfs_create_group(&port->dev->kobj, | |
1685 | &port_attribute_group); | |
ec64213c | 1686 | if (err) { |
431edb8a AS |
1687 | dev_err(port->dev, |
1688 | "Error %d creating sysfs device attributes\n", | |
1689 | err); | |
ec64213c AS |
1690 | } else { |
1691 | /* | |
1692 | * Generate a udev event so that appropriate | |
1693 | * symlinks can be created based on udev | |
1694 | * rules. | |
1695 | */ | |
1696 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
1697 | } | |
431edb8a | 1698 | break; |
17634ba2 AS |
1699 | } |
1700 | } | |
1701 | ||
1702 | static void control_work_handler(struct work_struct *work) | |
1703 | { | |
1704 | struct ports_device *portdev; | |
1705 | struct virtqueue *vq; | |
1706 | struct port_buffer *buf; | |
1707 | unsigned int len; | |
1708 | ||
1709 | portdev = container_of(work, struct ports_device, control_work); | |
1710 | vq = portdev->c_ivq; | |
1711 | ||
1712 | spin_lock(&portdev->cvq_lock); | |
505b0451 | 1713 | while ((buf = virtqueue_get_buf(vq, &len))) { |
17634ba2 AS |
1714 | spin_unlock(&portdev->cvq_lock); |
1715 | ||
1716 | buf->len = len; | |
1717 | buf->offset = 0; | |
1718 | ||
1719 | handle_control_message(portdev, buf); | |
1720 | ||
1721 | spin_lock(&portdev->cvq_lock); | |
1722 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
1723 | dev_warn(&portdev->vdev->dev, | |
1724 | "Error adding buffer to queue\n"); | |
1b637046 | 1725 | free_buf(buf, false); |
17634ba2 AS |
1726 | } |
1727 | } | |
1728 | spin_unlock(&portdev->cvq_lock); | |
1729 | } | |
1730 | ||
2770c5ea AS |
1731 | static void out_intr(struct virtqueue *vq) |
1732 | { | |
1733 | struct port *port; | |
1734 | ||
1735 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1736 | if (!port) | |
1737 | return; | |
1738 | ||
1739 | wake_up_interruptible(&port->waitqueue); | |
1740 | } | |
1741 | ||
17634ba2 AS |
1742 | static void in_intr(struct virtqueue *vq) |
1743 | { | |
1744 | struct port *port; | |
1745 | unsigned long flags; | |
1746 | ||
1747 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1748 | if (!port) | |
1749 | return; | |
1750 | ||
1751 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d25a9dda | 1752 | port->inbuf = get_inbuf(port); |
17634ba2 | 1753 | |
88f251ac AS |
1754 | /* |
1755 | * Don't queue up data when port is closed. This condition | |
1756 | * can be reached when a console port is not yet connected (no | |
1757 | * tty is spawned) and the host sends out data to console | |
1758 | * ports. For generic serial ports, the host won't | |
1759 | * (shouldn't) send data till the guest is connected. | |
1760 | */ | |
1761 | if (!port->guest_connected) | |
1762 | discard_port_data(port); | |
1763 | ||
17634ba2 AS |
1764 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1765 | ||
2030fa49 AS |
1766 | wake_up_interruptible(&port->waitqueue); |
1767 | ||
55f6bcce AS |
1768 | /* Send a SIGIO indicating new data in case the process asked for it */ |
1769 | send_sigio_to_port(port); | |
1770 | ||
17634ba2 AS |
1771 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1772 | hvc_kick(); | |
1773 | } | |
1774 | ||
1775 | static void control_intr(struct virtqueue *vq) | |
1776 | { | |
1777 | struct ports_device *portdev; | |
1778 | ||
1779 | portdev = vq->vdev->priv; | |
1780 | schedule_work(&portdev->control_work); | |
1781 | } | |
1782 | ||
7f5d810d AS |
1783 | static void config_intr(struct virtio_device *vdev) |
1784 | { | |
1785 | struct ports_device *portdev; | |
1786 | ||
1787 | portdev = vdev->priv; | |
99f905f8 | 1788 | |
4038f5b7 | 1789 | if (!use_multiport(portdev)) { |
9778829c AS |
1790 | struct port *port; |
1791 | u16 rows, cols; | |
1792 | ||
1793 | vdev->config->get(vdev, | |
1794 | offsetof(struct virtio_console_config, cols), | |
1795 | &cols, sizeof(u16)); | |
1796 | vdev->config->get(vdev, | |
1797 | offsetof(struct virtio_console_config, rows), | |
1798 | &rows, sizeof(u16)); | |
1799 | ||
1800 | port = find_port_by_id(portdev, 0); | |
1801 | set_console_size(port, rows, cols); | |
1802 | ||
4038f5b7 AS |
1803 | /* |
1804 | * We'll use this way of resizing only for legacy | |
1805 | * support. For newer userspace | |
1806 | * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages | |
1807 | * to indicate console size changes so that it can be | |
1808 | * done per-port. | |
1809 | */ | |
9778829c | 1810 | resize_console(port); |
4038f5b7 | 1811 | } |
7f5d810d AS |
1812 | } |
1813 | ||
2658a79a AS |
1814 | static int init_vqs(struct ports_device *portdev) |
1815 | { | |
1816 | vq_callback_t **io_callbacks; | |
1817 | char **io_names; | |
1818 | struct virtqueue **vqs; | |
17634ba2 | 1819 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1820 | int err; |
1821 | ||
17634ba2 AS |
1822 | nr_ports = portdev->config.max_nr_ports; |
1823 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1824 | |
1825 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
2658a79a | 1826 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); |
2658a79a | 1827 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); |
2658a79a AS |
1828 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1829 | GFP_KERNEL); | |
2658a79a AS |
1830 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1831 | GFP_KERNEL); | |
22e132ff | 1832 | if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || |
286f9a22 | 1833 | !portdev->out_vqs) { |
2658a79a | 1834 | err = -ENOMEM; |
22e132ff | 1835 | goto free; |
2658a79a AS |
1836 | } |
1837 | ||
17634ba2 AS |
1838 | /* |
1839 | * For backward compat (newer host but older guest), the host | |
1840 | * spawns a console port first and also inits the vqs for port | |
1841 | * 0 before others. | |
1842 | */ | |
1843 | j = 0; | |
1844 | io_callbacks[j] = in_intr; | |
2770c5ea | 1845 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1846 | io_names[j] = "input"; |
1847 | io_names[j + 1] = "output"; | |
1848 | j += 2; | |
1849 | ||
1850 | if (use_multiport(portdev)) { | |
1851 | io_callbacks[j] = control_intr; | |
1852 | io_callbacks[j + 1] = NULL; | |
1853 | io_names[j] = "control-i"; | |
1854 | io_names[j + 1] = "control-o"; | |
1855 | ||
1856 | for (i = 1; i < nr_ports; i++) { | |
1857 | j += 2; | |
1858 | io_callbacks[j] = in_intr; | |
2770c5ea | 1859 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1860 | io_names[j] = "input"; |
1861 | io_names[j + 1] = "output"; | |
1862 | } | |
1863 | } | |
2658a79a AS |
1864 | /* Find the queues. */ |
1865 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1866 | io_callbacks, | |
1867 | (const char **)io_names); | |
1868 | if (err) | |
22e132ff | 1869 | goto free; |
2658a79a | 1870 | |
17634ba2 | 1871 | j = 0; |
2658a79a AS |
1872 | portdev->in_vqs[0] = vqs[0]; |
1873 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1874 | j += 2; |
1875 | if (use_multiport(portdev)) { | |
1876 | portdev->c_ivq = vqs[j]; | |
1877 | portdev->c_ovq = vqs[j + 1]; | |
1878 | ||
1879 | for (i = 1; i < nr_ports; i++) { | |
1880 | j += 2; | |
1881 | portdev->in_vqs[i] = vqs[j]; | |
1882 | portdev->out_vqs[i] = vqs[j + 1]; | |
1883 | } | |
1884 | } | |
2658a79a | 1885 | kfree(io_names); |
22e132ff | 1886 | kfree(io_callbacks); |
2658a79a AS |
1887 | kfree(vqs); |
1888 | ||
1889 | return 0; | |
1890 | ||
22e132ff | 1891 | free: |
2658a79a | 1892 | kfree(portdev->out_vqs); |
2658a79a | 1893 | kfree(portdev->in_vqs); |
22e132ff JS |
1894 | kfree(io_names); |
1895 | kfree(io_callbacks); | |
2658a79a | 1896 | kfree(vqs); |
22e132ff | 1897 | |
2658a79a AS |
1898 | return err; |
1899 | } | |
1900 | ||
fb08bd27 AS |
1901 | static const struct file_operations portdev_fops = { |
1902 | .owner = THIS_MODULE, | |
1903 | }; | |
1904 | ||
a0e2dbfc AS |
1905 | static void remove_vqs(struct ports_device *portdev) |
1906 | { | |
1907 | portdev->vdev->config->del_vqs(portdev->vdev); | |
1908 | kfree(portdev->in_vqs); | |
1909 | kfree(portdev->out_vqs); | |
1910 | } | |
1911 | ||
1912 | static void remove_controlq_data(struct ports_device *portdev) | |
1913 | { | |
1914 | struct port_buffer *buf; | |
1915 | unsigned int len; | |
1916 | ||
1917 | if (!use_multiport(portdev)) | |
1918 | return; | |
1919 | ||
1920 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) | |
1b637046 | 1921 | free_buf(buf, true); |
a0e2dbfc AS |
1922 | |
1923 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) | |
1b637046 | 1924 | free_buf(buf, true); |
a0e2dbfc AS |
1925 | } |
1926 | ||
1c85bf35 AS |
1927 | /* |
1928 | * Once we're further in boot, we get probed like any other virtio | |
1929 | * device. | |
17634ba2 AS |
1930 | * |
1931 | * If the host also supports multiple console ports, we check the | |
1932 | * config space to see how many ports the host has spawned. We | |
1933 | * initialize each port found. | |
1c85bf35 | 1934 | */ |
2223cbec | 1935 | static int virtcons_probe(struct virtio_device *vdev) |
1c85bf35 | 1936 | { |
1c85bf35 AS |
1937 | struct ports_device *portdev; |
1938 | int err; | |
17634ba2 | 1939 | bool multiport; |
5e38483b CB |
1940 | bool early = early_put_chars != NULL; |
1941 | ||
1942 | /* Ensure to read early_put_chars now */ | |
1943 | barrier(); | |
1c85bf35 AS |
1944 | |
1945 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1946 | if (!portdev) { | |
1947 | err = -ENOMEM; | |
1948 | goto fail; | |
1949 | } | |
1950 | ||
1951 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1952 | portdev->vdev = vdev; | |
1953 | vdev->priv = portdev; | |
1954 | ||
fb08bd27 AS |
1955 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", |
1956 | &portdev_fops); | |
1957 | if (portdev->chr_major < 0) { | |
1958 | dev_err(&vdev->dev, | |
1959 | "Error %d registering chrdev for device %u\n", | |
dc18f080 | 1960 | portdev->chr_major, vdev->index); |
fb08bd27 AS |
1961 | err = portdev->chr_major; |
1962 | goto free; | |
1963 | } | |
1964 | ||
17634ba2 | 1965 | multiport = false; |
17634ba2 | 1966 | portdev->config.max_nr_ports = 1; |
1b637046 SB |
1967 | |
1968 | /* Don't test MULTIPORT at all if we're rproc: not a valid feature! */ | |
1969 | if (!is_rproc_serial(vdev) && | |
1970 | virtio_config_val(vdev, VIRTIO_CONSOLE_F_MULTIPORT, | |
1971 | offsetof(struct virtio_console_config, | |
1972 | max_nr_ports), | |
1973 | &portdev->config.max_nr_ports) == 0) { | |
17634ba2 | 1974 | multiport = true; |
1b637046 | 1975 | } |
17634ba2 | 1976 | |
2658a79a AS |
1977 | err = init_vqs(portdev); |
1978 | if (err < 0) { | |
1979 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1980 | goto free_chrdev; |
2658a79a | 1981 | } |
1c85bf35 | 1982 | |
17634ba2 AS |
1983 | spin_lock_init(&portdev->ports_lock); |
1984 | INIT_LIST_HEAD(&portdev->ports); | |
1985 | ||
1986 | if (multiport) { | |
335a64a5 AS |
1987 | unsigned int nr_added_bufs; |
1988 | ||
17634ba2 AS |
1989 | spin_lock_init(&portdev->cvq_lock); |
1990 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
1991 | ||
335a64a5 AS |
1992 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
1993 | if (!nr_added_bufs) { | |
22a29eac AS |
1994 | dev_err(&vdev->dev, |
1995 | "Error allocating buffers for control queue\n"); | |
1996 | err = -ENOMEM; | |
1997 | goto free_vqs; | |
1998 | } | |
1d05160b AS |
1999 | } else { |
2000 | /* | |
2001 | * For backward compatibility: Create a console port | |
2002 | * if we're running on older host. | |
2003 | */ | |
2004 | add_port(portdev, 0); | |
17634ba2 AS |
2005 | } |
2006 | ||
6bdf2afd AS |
2007 | spin_lock_irq(&pdrvdata_lock); |
2008 | list_add_tail(&portdev->list, &pdrvdata.portdevs); | |
2009 | spin_unlock_irq(&pdrvdata_lock); | |
2010 | ||
f909f850 AS |
2011 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
2012 | VIRTIO_CONSOLE_DEVICE_READY, 1); | |
5e38483b CB |
2013 | |
2014 | /* | |
2015 | * If there was an early virtio console, assume that there are no | |
2016 | * other consoles. We need to wait until the hvc_alloc matches the | |
2017 | * hvc_instantiate, otherwise tty_open will complain, resulting in | |
2018 | * a "Warning: unable to open an initial console" boot failure. | |
2019 | * Without multiport this is done in add_port above. With multiport | |
2020 | * this might take some host<->guest communication - thus we have to | |
2021 | * wait. | |
2022 | */ | |
2023 | if (multiport && early) | |
2024 | wait_for_completion(&early_console_added); | |
2025 | ||
31610434 RR |
2026 | return 0; |
2027 | ||
22a29eac | 2028 | free_vqs: |
0643e4c6 JL |
2029 | /* The host might want to notify mgmt sw about device add failure */ |
2030 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, | |
2031 | VIRTIO_CONSOLE_DEVICE_READY, 0); | |
a0e2dbfc | 2032 | remove_vqs(portdev); |
fb08bd27 AS |
2033 | free_chrdev: |
2034 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 2035 | free: |
1c85bf35 | 2036 | kfree(portdev); |
31610434 RR |
2037 | fail: |
2038 | return err; | |
2039 | } | |
2040 | ||
7177876f AS |
2041 | static void virtcons_remove(struct virtio_device *vdev) |
2042 | { | |
2043 | struct ports_device *portdev; | |
2044 | struct port *port, *port2; | |
7177876f AS |
2045 | |
2046 | portdev = vdev->priv; | |
2047 | ||
6bdf2afd AS |
2048 | spin_lock_irq(&pdrvdata_lock); |
2049 | list_del(&portdev->list); | |
2050 | spin_unlock_irq(&pdrvdata_lock); | |
2051 | ||
02238959 AS |
2052 | /* Disable interrupts for vqs */ |
2053 | vdev->config->reset(vdev); | |
2054 | /* Finish up work that's lined up */ | |
aded024a SB |
2055 | if (use_multiport(portdev)) |
2056 | cancel_work_sync(&portdev->control_work); | |
7177876f AS |
2057 | |
2058 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
b353a6b8 | 2059 | unplug_port(port); |
7177876f AS |
2060 | |
2061 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
2062 | ||
e062013c AS |
2063 | /* |
2064 | * When yanking out a device, we immediately lose the | |
2065 | * (device-side) queues. So there's no point in keeping the | |
2066 | * guest side around till we drop our final reference. This | |
2067 | * also means that any ports which are in an open state will | |
2068 | * have to just stop using the port, as the vqs are going | |
2069 | * away. | |
2070 | */ | |
a0e2dbfc AS |
2071 | remove_controlq_data(portdev); |
2072 | remove_vqs(portdev); | |
7177876f AS |
2073 | kfree(portdev); |
2074 | } | |
2075 | ||
31610434 RR |
2076 | static struct virtio_device_id id_table[] = { |
2077 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
2078 | { 0 }, | |
2079 | }; | |
2080 | ||
c2983458 CB |
2081 | static unsigned int features[] = { |
2082 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 2083 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
2084 | }; |
2085 | ||
1b637046 SB |
2086 | static struct virtio_device_id rproc_serial_id_table[] = { |
2087 | #if IS_ENABLED(CONFIG_REMOTEPROC) | |
2088 | { VIRTIO_ID_RPROC_SERIAL, VIRTIO_DEV_ANY_ID }, | |
2089 | #endif | |
2090 | { 0 }, | |
2091 | }; | |
2092 | ||
2093 | static unsigned int rproc_serial_features[] = { | |
2094 | }; | |
2095 | ||
2b8f41d8 AS |
2096 | #ifdef CONFIG_PM |
2097 | static int virtcons_freeze(struct virtio_device *vdev) | |
2098 | { | |
2099 | struct ports_device *portdev; | |
2100 | struct port *port; | |
2101 | ||
2102 | portdev = vdev->priv; | |
2103 | ||
2104 | vdev->config->reset(vdev); | |
2105 | ||
c743d09d | 2106 | virtqueue_disable_cb(portdev->c_ivq); |
2b8f41d8 | 2107 | cancel_work_sync(&portdev->control_work); |
c743d09d AS |
2108 | /* |
2109 | * Once more: if control_work_handler() was running, it would | |
2110 | * enable the cb as the last step. | |
2111 | */ | |
2112 | virtqueue_disable_cb(portdev->c_ivq); | |
2b8f41d8 AS |
2113 | remove_controlq_data(portdev); |
2114 | ||
2115 | list_for_each_entry(port, &portdev->ports, list) { | |
c743d09d AS |
2116 | virtqueue_disable_cb(port->in_vq); |
2117 | virtqueue_disable_cb(port->out_vq); | |
2b8f41d8 AS |
2118 | /* |
2119 | * We'll ask the host later if the new invocation has | |
2120 | * the port opened or closed. | |
2121 | */ | |
2122 | port->host_connected = false; | |
2123 | remove_port_data(port); | |
2124 | } | |
2125 | remove_vqs(portdev); | |
2126 | ||
2127 | return 0; | |
2128 | } | |
2129 | ||
2130 | static int virtcons_restore(struct virtio_device *vdev) | |
2131 | { | |
2132 | struct ports_device *portdev; | |
2133 | struct port *port; | |
2134 | int ret; | |
2135 | ||
2136 | portdev = vdev->priv; | |
2137 | ||
2138 | ret = init_vqs(portdev); | |
2139 | if (ret) | |
2140 | return ret; | |
2141 | ||
2142 | if (use_multiport(portdev)) | |
2143 | fill_queue(portdev->c_ivq, &portdev->cvq_lock); | |
2144 | ||
2145 | list_for_each_entry(port, &portdev->ports, list) { | |
2146 | port->in_vq = portdev->in_vqs[port->id]; | |
2147 | port->out_vq = portdev->out_vqs[port->id]; | |
2148 | ||
2149 | fill_queue(port->in_vq, &port->inbuf_lock); | |
2150 | ||
2151 | /* Get port open/close status on the host */ | |
2152 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
fa8b66cc AS |
2153 | |
2154 | /* | |
2155 | * If a port was open at the time of suspending, we | |
2156 | * have to let the host know that it's still open. | |
2157 | */ | |
2158 | if (port->guest_connected) | |
2159 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
2b8f41d8 AS |
2160 | } |
2161 | return 0; | |
2162 | } | |
2163 | #endif | |
2164 | ||
31610434 | 2165 | static struct virtio_driver virtio_console = { |
c2983458 CB |
2166 | .feature_table = features, |
2167 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
2168 | .driver.name = KBUILD_MODNAME, |
2169 | .driver.owner = THIS_MODULE, | |
2170 | .id_table = id_table, | |
2171 | .probe = virtcons_probe, | |
7177876f | 2172 | .remove = virtcons_remove, |
7f5d810d | 2173 | .config_changed = config_intr, |
2b8f41d8 AS |
2174 | #ifdef CONFIG_PM |
2175 | .freeze = virtcons_freeze, | |
2176 | .restore = virtcons_restore, | |
2177 | #endif | |
31610434 RR |
2178 | }; |
2179 | ||
bcd2982a | 2180 | static struct virtio_driver virtio_rproc_serial = { |
1b637046 SB |
2181 | .feature_table = rproc_serial_features, |
2182 | .feature_table_size = ARRAY_SIZE(rproc_serial_features), | |
2183 | .driver.name = "virtio_rproc_serial", | |
2184 | .driver.owner = THIS_MODULE, | |
2185 | .id_table = rproc_serial_id_table, | |
2186 | .probe = virtcons_probe, | |
2187 | .remove = virtcons_remove, | |
2188 | }; | |
2189 | ||
31610434 RR |
2190 | static int __init init(void) |
2191 | { | |
fb08bd27 AS |
2192 | int err; |
2193 | ||
2194 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
2195 | if (IS_ERR(pdrvdata.class)) { | |
2196 | err = PTR_ERR(pdrvdata.class); | |
2197 | pr_err("Error %d creating virtio-ports class\n", err); | |
2198 | return err; | |
2199 | } | |
d99393ef AS |
2200 | |
2201 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
2202 | if (!pdrvdata.debugfs_dir) { | |
2203 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
2204 | PTR_ERR(pdrvdata.debugfs_dir)); | |
2205 | } | |
38edf58d | 2206 | INIT_LIST_HEAD(&pdrvdata.consoles); |
6bdf2afd | 2207 | INIT_LIST_HEAD(&pdrvdata.portdevs); |
38edf58d | 2208 | |
33e1afc3 AK |
2209 | err = register_virtio_driver(&virtio_console); |
2210 | if (err < 0) { | |
2211 | pr_err("Error %d registering virtio driver\n", err); | |
2212 | goto free; | |
2213 | } | |
1b637046 SB |
2214 | err = register_virtio_driver(&virtio_rproc_serial); |
2215 | if (err < 0) { | |
2216 | pr_err("Error %d registering virtio rproc serial driver\n", | |
2217 | err); | |
2218 | goto unregister; | |
2219 | } | |
33e1afc3 | 2220 | return 0; |
1b637046 SB |
2221 | unregister: |
2222 | unregister_virtio_driver(&virtio_console); | |
33e1afc3 AK |
2223 | free: |
2224 | if (pdrvdata.debugfs_dir) | |
2225 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
2226 | class_destroy(pdrvdata.class); | |
2227 | return err; | |
31610434 | 2228 | } |
7177876f AS |
2229 | |
2230 | static void __exit fini(void) | |
2231 | { | |
1b637046 SB |
2232 | reclaim_dma_bufs(); |
2233 | ||
7177876f | 2234 | unregister_virtio_driver(&virtio_console); |
1b637046 | 2235 | unregister_virtio_driver(&virtio_rproc_serial); |
7177876f AS |
2236 | |
2237 | class_destroy(pdrvdata.class); | |
2238 | if (pdrvdata.debugfs_dir) | |
2239 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
2240 | } | |
31610434 | 2241 | module_init(init); |
7177876f | 2242 | module_exit(fini); |
31610434 RR |
2243 | |
2244 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2245 | MODULE_DESCRIPTION("Virtio console driver"); | |
2246 | MODULE_LICENSE("GPL"); |