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 | ||
3826835a WY |
81 | static DEFINE_SPINLOCK(pdrvdata_lock); |
82 | static 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 */ | |
165b1b8b | 152 | spinlock_t c_ivq_lock; |
9ba5c80b | 153 | spinlock_t c_ovq_lock; |
17634ba2 AS |
154 | |
155 | /* The current config space is stored here */ | |
b99fa815 | 156 | struct virtio_console_config config; |
17634ba2 AS |
157 | |
158 | /* The virtio device we're associated with */ | |
159 | struct virtio_device *vdev; | |
160 | ||
161 | /* | |
162 | * A couple of virtqueues for the control channel: one for | |
163 | * guest->host transfers, one for host->guest transfers | |
164 | */ | |
165 | struct virtqueue *c_ivq, *c_ovq; | |
166 | ||
167 | /* Array of per-port IO virtqueues */ | |
168 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 | 169 | |
fb08bd27 AS |
170 | /* Major number for this device. Ports will be created as minors. */ |
171 | int chr_major; | |
17634ba2 AS |
172 | }; |
173 | ||
17e5b4f2 AS |
174 | struct port_stats { |
175 | unsigned long bytes_sent, bytes_received, bytes_discarded; | |
176 | }; | |
177 | ||
1c85bf35 | 178 | /* This struct holds the per-port data */ |
21206ede | 179 | struct port { |
17634ba2 AS |
180 | /* Next port in the list, head is in the ports_device */ |
181 | struct list_head list; | |
182 | ||
1c85bf35 AS |
183 | /* Pointer to the parent virtio_console device */ |
184 | struct ports_device *portdev; | |
fdb9a054 AS |
185 | |
186 | /* The current buffer from which data has to be fed to readers */ | |
187 | struct port_buffer *inbuf; | |
21206ede | 188 | |
203baab8 AS |
189 | /* |
190 | * To protect the operations on the in_vq associated with this | |
191 | * port. Has to be a spinlock because it can be called from | |
192 | * interrupt context (get_char()). | |
193 | */ | |
194 | spinlock_t inbuf_lock; | |
195 | ||
cdfadfc1 AS |
196 | /* Protect the operations on the out_vq. */ |
197 | spinlock_t outvq_lock; | |
198 | ||
1c85bf35 AS |
199 | /* The IO vqs for this port */ |
200 | struct virtqueue *in_vq, *out_vq; | |
201 | ||
d99393ef AS |
202 | /* File in the debugfs directory that exposes this port's information */ |
203 | struct dentry *debugfs_file; | |
204 | ||
17e5b4f2 AS |
205 | /* |
206 | * Keep count of the bytes sent, received and discarded for | |
207 | * this port for accounting and debugging purposes. These | |
208 | * counts are not reset across port open / close events. | |
209 | */ | |
210 | struct port_stats stats; | |
211 | ||
4f23c573 AS |
212 | /* |
213 | * The entries in this struct will be valid if this port is | |
214 | * hooked up to an hvc console | |
215 | */ | |
216 | struct console cons; | |
17634ba2 | 217 | |
fb08bd27 | 218 | /* Each port associates with a separate char device */ |
d22a6989 | 219 | struct cdev *cdev; |
fb08bd27 AS |
220 | struct device *dev; |
221 | ||
b353a6b8 AS |
222 | /* Reference-counting to handle port hot-unplugs and file operations */ |
223 | struct kref kref; | |
224 | ||
2030fa49 AS |
225 | /* A waitqueue for poll() or blocking read operations */ |
226 | wait_queue_head_t waitqueue; | |
227 | ||
431edb8a AS |
228 | /* The 'name' of the port that we expose via sysfs properties */ |
229 | char *name; | |
230 | ||
3eae0ade AS |
231 | /* We can notify apps of host connect / disconnect events via SIGIO */ |
232 | struct fasync_struct *async_queue; | |
233 | ||
17634ba2 AS |
234 | /* The 'id' to identify the port with the Host */ |
235 | u32 id; | |
2030fa49 | 236 | |
cdfadfc1 AS |
237 | bool outvq_full; |
238 | ||
2030fa49 AS |
239 | /* Is the host device open */ |
240 | bool host_connected; | |
3c7969cc AS |
241 | |
242 | /* We should allow only one process to open a port */ | |
243 | bool guest_connected; | |
21206ede | 244 | }; |
31610434 | 245 | |
971f3390 RR |
246 | /* This is the very early arch-specified put chars function. */ |
247 | static int (*early_put_chars)(u32, const char *, int); | |
248 | ||
38edf58d AS |
249 | static struct port *find_port_by_vtermno(u32 vtermno) |
250 | { | |
251 | struct port *port; | |
4f23c573 | 252 | struct console *cons; |
38edf58d AS |
253 | unsigned long flags; |
254 | ||
255 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
256 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
257 | if (cons->vtermno == vtermno) { | |
258 | port = container_of(cons, struct port, cons); | |
38edf58d | 259 | goto out; |
4f23c573 | 260 | } |
38edf58d AS |
261 | } |
262 | port = NULL; | |
263 | out: | |
264 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
265 | return port; | |
266 | } | |
267 | ||
04950cdf AS |
268 | static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, |
269 | dev_t dev) | |
270 | { | |
271 | struct port *port; | |
272 | unsigned long flags; | |
273 | ||
274 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
057b82be AS |
275 | list_for_each_entry(port, &portdev->ports, list) { |
276 | if (port->cdev->dev == dev) { | |
277 | kref_get(&port->kref); | |
04950cdf | 278 | goto out; |
057b82be AS |
279 | } |
280 | } | |
04950cdf AS |
281 | port = NULL; |
282 | out: | |
283 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
284 | ||
285 | return port; | |
286 | } | |
287 | ||
288 | static struct port *find_port_by_devt(dev_t dev) | |
289 | { | |
290 | struct ports_device *portdev; | |
291 | struct port *port; | |
292 | unsigned long flags; | |
293 | ||
294 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
295 | list_for_each_entry(portdev, &pdrvdata.portdevs, list) { | |
296 | port = find_port_by_devt_in_portdev(portdev, dev); | |
297 | if (port) | |
298 | goto out; | |
299 | } | |
300 | port = NULL; | |
301 | out: | |
302 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
303 | return port; | |
304 | } | |
305 | ||
17634ba2 AS |
306 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
307 | { | |
308 | struct port *port; | |
309 | unsigned long flags; | |
310 | ||
311 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
312 | list_for_each_entry(port, &portdev->ports, list) | |
313 | if (port->id == id) | |
314 | goto out; | |
315 | port = NULL; | |
316 | out: | |
317 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
318 | ||
319 | return port; | |
320 | } | |
321 | ||
203baab8 AS |
322 | static struct port *find_port_by_vq(struct ports_device *portdev, |
323 | struct virtqueue *vq) | |
324 | { | |
325 | struct port *port; | |
203baab8 AS |
326 | unsigned long flags; |
327 | ||
17634ba2 AS |
328 | spin_lock_irqsave(&portdev->ports_lock, flags); |
329 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
330 | if (port->in_vq == vq || port->out_vq == vq) |
331 | goto out; | |
203baab8 AS |
332 | port = NULL; |
333 | out: | |
17634ba2 | 334 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
335 | return port; |
336 | } | |
337 | ||
17634ba2 AS |
338 | static bool is_console_port(struct port *port) |
339 | { | |
340 | if (port->cons.hvc) | |
341 | return true; | |
342 | return false; | |
343 | } | |
344 | ||
1b637046 SB |
345 | static bool is_rproc_serial(const struct virtio_device *vdev) |
346 | { | |
347 | return is_rproc_enabled && vdev->id.device == VIRTIO_ID_RPROC_SERIAL; | |
348 | } | |
349 | ||
17634ba2 AS |
350 | static inline bool use_multiport(struct ports_device *portdev) |
351 | { | |
352 | /* | |
353 | * This condition can be true when put_chars is called from | |
354 | * early_init | |
355 | */ | |
356 | if (!portdev->vdev) | |
357 | return 0; | |
358 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
359 | } | |
360 | ||
1b637046 SB |
361 | static DEFINE_SPINLOCK(dma_bufs_lock); |
362 | static LIST_HEAD(pending_free_dma_bufs); | |
363 | ||
364 | static void free_buf(struct port_buffer *buf, bool can_sleep) | |
fdb9a054 | 365 | { |
276a3e95 SB |
366 | unsigned int i; |
367 | ||
276a3e95 SB |
368 | for (i = 0; i < buf->sgpages; i++) { |
369 | struct page *page = sg_page(&buf->sg[i]); | |
370 | if (!page) | |
371 | break; | |
372 | put_page(page); | |
373 | } | |
374 | ||
1b637046 SB |
375 | if (!buf->dev) { |
376 | kfree(buf->buf); | |
377 | } else if (is_rproc_enabled) { | |
378 | unsigned long flags; | |
379 | ||
380 | /* dma_free_coherent requires interrupts to be enabled. */ | |
381 | if (!can_sleep) { | |
382 | /* queue up dma-buffers to be freed later */ | |
383 | spin_lock_irqsave(&dma_bufs_lock, flags); | |
384 | list_add_tail(&buf->list, &pending_free_dma_bufs); | |
385 | spin_unlock_irqrestore(&dma_bufs_lock, flags); | |
386 | return; | |
387 | } | |
388 | dma_free_coherent(buf->dev, buf->size, buf->buf, buf->dma); | |
389 | ||
390 | /* Release device refcnt and allow it to be freed */ | |
391 | put_device(buf->dev); | |
392 | } | |
393 | ||
fdb9a054 AS |
394 | kfree(buf); |
395 | } | |
396 | ||
1b637046 SB |
397 | static void reclaim_dma_bufs(void) |
398 | { | |
399 | unsigned long flags; | |
400 | struct port_buffer *buf, *tmp; | |
401 | LIST_HEAD(tmp_list); | |
402 | ||
403 | if (list_empty(&pending_free_dma_bufs)) | |
404 | return; | |
405 | ||
406 | /* Create a copy of the pending_free_dma_bufs while holding the lock */ | |
407 | spin_lock_irqsave(&dma_bufs_lock, flags); | |
408 | list_cut_position(&tmp_list, &pending_free_dma_bufs, | |
409 | pending_free_dma_bufs.prev); | |
410 | spin_unlock_irqrestore(&dma_bufs_lock, flags); | |
411 | ||
412 | /* Release the dma buffers, without irqs enabled */ | |
413 | list_for_each_entry_safe(buf, tmp, &tmp_list, list) { | |
414 | list_del(&buf->list); | |
415 | free_buf(buf, true); | |
416 | } | |
417 | } | |
418 | ||
276a3e95 SB |
419 | static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size, |
420 | int pages) | |
fdb9a054 AS |
421 | { |
422 | struct port_buffer *buf; | |
423 | ||
1b637046 SB |
424 | reclaim_dma_bufs(); |
425 | ||
276a3e95 SB |
426 | /* |
427 | * Allocate buffer and the sg list. The sg list array is allocated | |
428 | * directly after the port_buffer struct. | |
429 | */ | |
430 | buf = kmalloc(sizeof(*buf) + sizeof(struct scatterlist) * pages, | |
431 | GFP_KERNEL); | |
fdb9a054 AS |
432 | if (!buf) |
433 | goto fail; | |
276a3e95 SB |
434 | |
435 | buf->sgpages = pages; | |
436 | if (pages > 0) { | |
1b637046 | 437 | buf->dev = NULL; |
276a3e95 SB |
438 | buf->buf = NULL; |
439 | return buf; | |
440 | } | |
441 | ||
1b637046 SB |
442 | if (is_rproc_serial(vq->vdev)) { |
443 | /* | |
444 | * Allocate DMA memory from ancestor. When a virtio | |
445 | * device is created by remoteproc, the DMA memory is | |
446 | * associated with the grandparent device: | |
447 | * vdev => rproc => platform-dev. | |
448 | * The code here would have been less quirky if | |
449 | * DMA_MEMORY_INCLUDES_CHILDREN had been supported | |
450 | * in dma-coherent.c | |
451 | */ | |
452 | if (!vq->vdev->dev.parent || !vq->vdev->dev.parent->parent) | |
453 | goto free_buf; | |
454 | buf->dev = vq->vdev->dev.parent->parent; | |
455 | ||
456 | /* Increase device refcnt to avoid freeing it */ | |
457 | get_device(buf->dev); | |
458 | buf->buf = dma_alloc_coherent(buf->dev, buf_size, &buf->dma, | |
459 | GFP_KERNEL); | |
460 | } else { | |
461 | buf->dev = NULL; | |
462 | buf->buf = kmalloc(buf_size, GFP_KERNEL); | |
463 | } | |
464 | ||
fdb9a054 AS |
465 | if (!buf->buf) |
466 | goto free_buf; | |
467 | buf->len = 0; | |
468 | buf->offset = 0; | |
469 | buf->size = buf_size; | |
470 | return buf; | |
471 | ||
472 | free_buf: | |
473 | kfree(buf); | |
474 | fail: | |
475 | return NULL; | |
476 | } | |
477 | ||
a3cde449 | 478 | /* Callers should take appropriate locks */ |
defde669 | 479 | static struct port_buffer *get_inbuf(struct port *port) |
a3cde449 AS |
480 | { |
481 | struct port_buffer *buf; | |
a3cde449 AS |
482 | unsigned int len; |
483 | ||
d25a9dda AS |
484 | if (port->inbuf) |
485 | return port->inbuf; | |
486 | ||
487 | buf = virtqueue_get_buf(port->in_vq, &len); | |
a3cde449 AS |
488 | if (buf) { |
489 | buf->len = len; | |
490 | buf->offset = 0; | |
17e5b4f2 | 491 | port->stats.bytes_received += len; |
a3cde449 AS |
492 | } |
493 | return buf; | |
494 | } | |
495 | ||
e27b5198 AS |
496 | /* |
497 | * Create a scatter-gather list representing our input buffer and put | |
498 | * it in the queue. | |
499 | * | |
500 | * Callers should take appropriate locks. | |
501 | */ | |
203baab8 | 502 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
503 | { |
504 | struct scatterlist sg[1]; | |
203baab8 | 505 | int ret; |
1c85bf35 | 506 | |
e27b5198 AS |
507 | sg_init_one(sg, buf->buf, buf->size); |
508 | ||
6797999d | 509 | ret = virtqueue_add_inbuf(vq, sg, 1, buf, GFP_ATOMIC); |
505b0451 | 510 | virtqueue_kick(vq); |
49e86f16 AS |
511 | if (!ret) |
512 | ret = vq->num_free; | |
203baab8 AS |
513 | return ret; |
514 | } | |
515 | ||
88f251ac AS |
516 | /* Discard any unread data this port has. Callers lockers. */ |
517 | static void discard_port_data(struct port *port) | |
518 | { | |
519 | struct port_buffer *buf; | |
2d24cdaa | 520 | unsigned int err; |
88f251ac | 521 | |
d7a62cd0 AS |
522 | if (!port->portdev) { |
523 | /* Device has been unplugged. vqs are already gone. */ | |
524 | return; | |
525 | } | |
2d24cdaa | 526 | buf = get_inbuf(port); |
88f251ac | 527 | |
ce072a0c | 528 | err = 0; |
d6933561 | 529 | while (buf) { |
17e5b4f2 | 530 | port->stats.bytes_discarded += buf->len - buf->offset; |
2d24cdaa | 531 | if (add_inbuf(port->in_vq, buf) < 0) { |
ce072a0c | 532 | err++; |
1b637046 | 533 | free_buf(buf, false); |
d6933561 | 534 | } |
2d24cdaa AS |
535 | port->inbuf = NULL; |
536 | buf = get_inbuf(port); | |
88f251ac | 537 | } |
ce072a0c | 538 | if (err) |
d6933561 | 539 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", |
ce072a0c | 540 | err); |
88f251ac AS |
541 | } |
542 | ||
203baab8 AS |
543 | static bool port_has_data(struct port *port) |
544 | { | |
545 | unsigned long flags; | |
546 | bool ret; | |
547 | ||
d25a9dda | 548 | ret = false; |
203baab8 | 549 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 550 | port->inbuf = get_inbuf(port); |
d25a9dda | 551 | if (port->inbuf) |
d6933561 | 552 | ret = true; |
d25a9dda | 553 | |
203baab8 | 554 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
555 | return ret; |
556 | } | |
557 | ||
3425e706 AS |
558 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
559 | unsigned int event, unsigned int value) | |
17634ba2 AS |
560 | { |
561 | struct scatterlist sg[1]; | |
562 | struct virtio_console_control cpkt; | |
563 | struct virtqueue *vq; | |
604b2ad7 | 564 | unsigned int len; |
17634ba2 | 565 | |
3425e706 | 566 | if (!use_multiport(portdev)) |
17634ba2 AS |
567 | return 0; |
568 | ||
3425e706 | 569 | cpkt.id = port_id; |
17634ba2 AS |
570 | cpkt.event = event; |
571 | cpkt.value = value; | |
572 | ||
3425e706 | 573 | vq = portdev->c_ovq; |
17634ba2 AS |
574 | |
575 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
9ba5c80b AS |
576 | |
577 | spin_lock(&portdev->c_ovq_lock); | |
6797999d | 578 | if (virtqueue_add_outbuf(vq, sg, 1, &cpkt, GFP_ATOMIC) == 0) { |
505b0451 | 579 | virtqueue_kick(vq); |
40e4dc53 HG |
580 | while (!virtqueue_get_buf(vq, &len) |
581 | && !virtqueue_is_broken(vq)) | |
17634ba2 AS |
582 | cpu_relax(); |
583 | } | |
9ba5c80b | 584 | spin_unlock(&portdev->c_ovq_lock); |
17634ba2 AS |
585 | return 0; |
586 | } | |
587 | ||
3425e706 AS |
588 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
589 | unsigned int value) | |
590 | { | |
84ec06c5 AS |
591 | /* Did the port get unplugged before userspace closed it? */ |
592 | if (port->portdev) | |
593 | return __send_control_msg(port->portdev, port->id, event, value); | |
594 | return 0; | |
3425e706 AS |
595 | } |
596 | ||
eb5e89fc | 597 | |
cdfadfc1 AS |
598 | /* Callers must take the port->outvq_lock */ |
599 | static void reclaim_consumed_buffers(struct port *port) | |
600 | { | |
276a3e95 | 601 | struct port_buffer *buf; |
cdfadfc1 AS |
602 | unsigned int len; |
603 | ||
d7a62cd0 AS |
604 | if (!port->portdev) { |
605 | /* Device has been unplugged. vqs are already gone. */ | |
606 | return; | |
607 | } | |
276a3e95 | 608 | while ((buf = virtqueue_get_buf(port->out_vq, &len))) { |
1b637046 | 609 | free_buf(buf, false); |
cdfadfc1 AS |
610 | port->outvq_full = false; |
611 | } | |
612 | } | |
613 | ||
eb5e89fc MH |
614 | static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, |
615 | int nents, size_t in_count, | |
276a3e95 | 616 | void *data, bool nonblock) |
f997f00b | 617 | { |
f997f00b | 618 | struct virtqueue *out_vq; |
589575a2 | 619 | int err; |
cdfadfc1 | 620 | unsigned long flags; |
f997f00b AS |
621 | unsigned int len; |
622 | ||
623 | out_vq = port->out_vq; | |
624 | ||
cdfadfc1 AS |
625 | spin_lock_irqsave(&port->outvq_lock, flags); |
626 | ||
627 | reclaim_consumed_buffers(port); | |
628 | ||
6797999d | 629 | err = virtqueue_add_outbuf(out_vq, sg, nents, data, GFP_ATOMIC); |
f997f00b AS |
630 | |
631 | /* Tell Host to go! */ | |
505b0451 | 632 | virtqueue_kick(out_vq); |
f997f00b | 633 | |
589575a2 | 634 | if (err) { |
9ff4cfab | 635 | in_count = 0; |
cdfadfc1 | 636 | goto done; |
f997f00b AS |
637 | } |
638 | ||
589575a2 | 639 | if (out_vq->num_free == 0) |
cdfadfc1 AS |
640 | port->outvq_full = true; |
641 | ||
642 | if (nonblock) | |
643 | goto done; | |
644 | ||
645 | /* | |
646 | * Wait till the host acknowledges it pushed out the data we | |
531295e6 AS |
647 | * sent. This is done for data from the hvc_console; the tty |
648 | * operations are performed with spinlocks held so we can't | |
649 | * sleep here. An alternative would be to copy the data to a | |
650 | * buffer and relax the spinning requirement. The downside is | |
651 | * we need to kmalloc a GFP_ATOMIC buffer each time the | |
652 | * console driver writes something out. | |
cdfadfc1 | 653 | */ |
40e4dc53 HG |
654 | while (!virtqueue_get_buf(out_vq, &len) |
655 | && !virtqueue_is_broken(out_vq)) | |
f997f00b | 656 | cpu_relax(); |
cdfadfc1 AS |
657 | done: |
658 | spin_unlock_irqrestore(&port->outvq_lock, flags); | |
17e5b4f2 AS |
659 | |
660 | port->stats.bytes_sent += in_count; | |
cdfadfc1 AS |
661 | /* |
662 | * We're expected to return the amount of data we wrote -- all | |
663 | * of it | |
664 | */ | |
9ff4cfab | 665 | return in_count; |
f997f00b AS |
666 | } |
667 | ||
203baab8 AS |
668 | /* |
669 | * Give out the data that's requested from the buffer that we have | |
670 | * queued up. | |
671 | */ | |
b766ceed AS |
672 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
673 | bool to_user) | |
203baab8 AS |
674 | { |
675 | struct port_buffer *buf; | |
676 | unsigned long flags; | |
677 | ||
678 | if (!out_count || !port_has_data(port)) | |
679 | return 0; | |
680 | ||
681 | buf = port->inbuf; | |
b766ceed | 682 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 683 | |
b766ceed AS |
684 | if (to_user) { |
685 | ssize_t ret; | |
686 | ||
687 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
688 | if (ret) | |
689 | return -EFAULT; | |
690 | } else { | |
691 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
692 | } | |
203baab8 | 693 | |
203baab8 AS |
694 | buf->offset += out_count; |
695 | ||
696 | if (buf->offset == buf->len) { | |
697 | /* | |
698 | * We're done using all the data in this buffer. | |
699 | * Re-queue so that the Host can send us more data. | |
700 | */ | |
701 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
702 | port->inbuf = NULL; | |
703 | ||
704 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 705 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
706 | |
707 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
708 | } | |
b766ceed | 709 | /* Return the number of bytes actually copied */ |
203baab8 | 710 | return out_count; |
e27b5198 AS |
711 | } |
712 | ||
2030fa49 | 713 | /* The condition that must be true for polling to end */ |
60caacd3 | 714 | static bool will_read_block(struct port *port) |
2030fa49 | 715 | { |
3709ea7a AS |
716 | if (!port->guest_connected) { |
717 | /* Port got hot-unplugged. Let's exit. */ | |
718 | return false; | |
719 | } | |
60caacd3 | 720 | return !port_has_data(port) && port->host_connected; |
2030fa49 AS |
721 | } |
722 | ||
cdfadfc1 AS |
723 | static bool will_write_block(struct port *port) |
724 | { | |
725 | bool ret; | |
726 | ||
60e5e0b8 AS |
727 | if (!port->guest_connected) { |
728 | /* Port got hot-unplugged. Let's exit. */ | |
729 | return false; | |
730 | } | |
cdfadfc1 AS |
731 | if (!port->host_connected) |
732 | return true; | |
733 | ||
734 | spin_lock_irq(&port->outvq_lock); | |
735 | /* | |
736 | * Check if the Host has consumed any buffers since we last | |
737 | * sent data (this is only applicable for nonblocking ports). | |
738 | */ | |
739 | reclaim_consumed_buffers(port); | |
740 | ret = port->outvq_full; | |
741 | spin_unlock_irq(&port->outvq_lock); | |
742 | ||
743 | return ret; | |
744 | } | |
745 | ||
2030fa49 AS |
746 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, |
747 | size_t count, loff_t *offp) | |
748 | { | |
749 | struct port *port; | |
750 | ssize_t ret; | |
751 | ||
752 | port = filp->private_data; | |
753 | ||
96f97a83 AS |
754 | /* Port is hot-unplugged. */ |
755 | if (!port->guest_connected) | |
756 | return -ENODEV; | |
757 | ||
2030fa49 AS |
758 | if (!port_has_data(port)) { |
759 | /* | |
760 | * If nothing's connected on the host just return 0 in | |
761 | * case of list_empty; this tells the userspace app | |
762 | * that there's no connection | |
763 | */ | |
764 | if (!port->host_connected) | |
765 | return 0; | |
766 | if (filp->f_flags & O_NONBLOCK) | |
767 | return -EAGAIN; | |
768 | ||
a08fa92d AS |
769 | ret = wait_event_freezable(port->waitqueue, |
770 | !will_read_block(port)); | |
2030fa49 AS |
771 | if (ret < 0) |
772 | return ret; | |
773 | } | |
96f97a83 | 774 | /* Port got hot-unplugged while we were waiting above. */ |
b3dddb9e AS |
775 | if (!port->guest_connected) |
776 | return -ENODEV; | |
2030fa49 AS |
777 | /* |
778 | * We could've received a disconnection message while we were | |
779 | * waiting for more data. | |
780 | * | |
781 | * This check is not clubbed in the if() statement above as we | |
782 | * might receive some data as well as the host could get | |
783 | * disconnected after we got woken up from our wait. So we | |
784 | * really want to give off whatever data we have and only then | |
785 | * check for host_connected. | |
786 | */ | |
787 | if (!port_has_data(port) && !port->host_connected) | |
788 | return 0; | |
789 | ||
790 | return fill_readbuf(port, ubuf, count, true); | |
791 | } | |
792 | ||
efe75d24 MH |
793 | static int wait_port_writable(struct port *port, bool nonblock) |
794 | { | |
795 | int ret; | |
796 | ||
797 | if (will_write_block(port)) { | |
798 | if (nonblock) | |
799 | return -EAGAIN; | |
800 | ||
801 | ret = wait_event_freezable(port->waitqueue, | |
802 | !will_write_block(port)); | |
803 | if (ret < 0) | |
804 | return ret; | |
805 | } | |
806 | /* Port got hot-unplugged. */ | |
807 | if (!port->guest_connected) | |
808 | return -ENODEV; | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
2030fa49 AS |
813 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, |
814 | size_t count, loff_t *offp) | |
815 | { | |
816 | struct port *port; | |
276a3e95 | 817 | struct port_buffer *buf; |
2030fa49 | 818 | ssize_t ret; |
cdfadfc1 | 819 | bool nonblock; |
276a3e95 | 820 | struct scatterlist sg[1]; |
2030fa49 | 821 | |
65745422 AS |
822 | /* Userspace could be out to fool us */ |
823 | if (!count) | |
824 | return 0; | |
825 | ||
2030fa49 AS |
826 | port = filp->private_data; |
827 | ||
cdfadfc1 AS |
828 | nonblock = filp->f_flags & O_NONBLOCK; |
829 | ||
efe75d24 MH |
830 | ret = wait_port_writable(port, nonblock); |
831 | if (ret < 0) | |
832 | return ret; | |
cdfadfc1 | 833 | |
2030fa49 AS |
834 | count = min((size_t)(32 * 1024), count); |
835 | ||
276a3e95 | 836 | buf = alloc_buf(port->out_vq, count, 0); |
2030fa49 AS |
837 | if (!buf) |
838 | return -ENOMEM; | |
839 | ||
276a3e95 | 840 | ret = copy_from_user(buf->buf, ubuf, count); |
2030fa49 AS |
841 | if (ret) { |
842 | ret = -EFAULT; | |
843 | goto free_buf; | |
844 | } | |
845 | ||
531295e6 AS |
846 | /* |
847 | * We now ask send_buf() to not spin for generic ports -- we | |
848 | * can re-use the same code path that non-blocking file | |
849 | * descriptors take for blocking file descriptors since the | |
850 | * wait is already done and we're certain the write will go | |
851 | * through to the host. | |
852 | */ | |
853 | nonblock = true; | |
276a3e95 SB |
854 | sg_init_one(sg, buf->buf, count); |
855 | ret = __send_to_port(port, sg, 1, count, buf, nonblock); | |
cdfadfc1 AS |
856 | |
857 | if (nonblock && ret > 0) | |
858 | goto out; | |
859 | ||
2030fa49 | 860 | free_buf: |
1b637046 | 861 | free_buf(buf, true); |
cdfadfc1 | 862 | out: |
2030fa49 AS |
863 | return ret; |
864 | } | |
865 | ||
eb5e89fc MH |
866 | struct sg_list { |
867 | unsigned int n; | |
8ca84a50 | 868 | unsigned int size; |
eb5e89fc MH |
869 | size_t len; |
870 | struct scatterlist *sg; | |
871 | }; | |
872 | ||
873 | static int pipe_to_sg(struct pipe_inode_info *pipe, struct pipe_buffer *buf, | |
874 | struct splice_desc *sd) | |
875 | { | |
876 | struct sg_list *sgl = sd->u.data; | |
ec8fc870 | 877 | unsigned int offset, len; |
eb5e89fc | 878 | |
8ca84a50 | 879 | if (sgl->n == sgl->size) |
eb5e89fc MH |
880 | return 0; |
881 | ||
882 | /* Try lock this page */ | |
883 | if (buf->ops->steal(pipe, buf) == 0) { | |
884 | /* Get reference and unlock page for moving */ | |
885 | get_page(buf->page); | |
886 | unlock_page(buf->page); | |
887 | ||
888 | len = min(buf->len, sd->len); | |
889 | sg_set_page(&(sgl->sg[sgl->n]), buf->page, len, buf->offset); | |
ec8fc870 MH |
890 | } else { |
891 | /* Failback to copying a page */ | |
892 | struct page *page = alloc_page(GFP_KERNEL); | |
c9efe511 | 893 | char *src; |
ec8fc870 MH |
894 | |
895 | if (!page) | |
896 | return -ENOMEM; | |
ec8fc870 MH |
897 | |
898 | offset = sd->pos & ~PAGE_MASK; | |
899 | ||
900 | len = sd->len; | |
901 | if (len + offset > PAGE_SIZE) | |
902 | len = PAGE_SIZE - offset; | |
903 | ||
c9efe511 AV |
904 | src = buf->ops->map(pipe, buf, 1); |
905 | memcpy(page_address(page) + offset, src + buf->offset, len); | |
ec8fc870 MH |
906 | buf->ops->unmap(pipe, buf, src); |
907 | ||
908 | sg_set_page(&(sgl->sg[sgl->n]), page, len, offset); | |
eb5e89fc | 909 | } |
ec8fc870 MH |
910 | sgl->n++; |
911 | sgl->len += len; | |
eb5e89fc MH |
912 | |
913 | return len; | |
914 | } | |
915 | ||
916 | /* Faster zero-copy write by splicing */ | |
917 | static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, | |
918 | struct file *filp, loff_t *ppos, | |
919 | size_t len, unsigned int flags) | |
920 | { | |
921 | struct port *port = filp->private_data; | |
922 | struct sg_list sgl; | |
923 | ssize_t ret; | |
276a3e95 | 924 | struct port_buffer *buf; |
eb5e89fc MH |
925 | struct splice_desc sd = { |
926 | .total_len = len, | |
927 | .flags = flags, | |
928 | .pos = *ppos, | |
929 | .u.data = &sgl, | |
930 | }; | |
931 | ||
1b637046 SB |
932 | /* |
933 | * Rproc_serial does not yet support splice. To support splice | |
934 | * pipe_to_sg() must allocate dma-buffers and copy content from | |
935 | * regular pages to dma pages. And alloc_buf and free_buf must | |
936 | * support allocating and freeing such a list of dma-buffers. | |
937 | */ | |
938 | if (is_rproc_serial(port->out_vq->vdev)) | |
939 | return -EINVAL; | |
940 | ||
68c034fe YY |
941 | /* |
942 | * pipe->nrbufs == 0 means there are no data to transfer, | |
943 | * so this returns just 0 for no data. | |
944 | */ | |
2b4fbf02 YY |
945 | pipe_lock(pipe); |
946 | if (!pipe->nrbufs) { | |
947 | ret = 0; | |
948 | goto error_out; | |
949 | } | |
68c034fe | 950 | |
efe75d24 MH |
951 | ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK); |
952 | if (ret < 0) | |
2b4fbf02 | 953 | goto error_out; |
efe75d24 | 954 | |
276a3e95 | 955 | buf = alloc_buf(port->out_vq, 0, pipe->nrbufs); |
2b4fbf02 YY |
956 | if (!buf) { |
957 | ret = -ENOMEM; | |
958 | goto error_out; | |
959 | } | |
276a3e95 | 960 | |
eb5e89fc MH |
961 | sgl.n = 0; |
962 | sgl.len = 0; | |
8ca84a50 | 963 | sgl.size = pipe->nrbufs; |
276a3e95 | 964 | sgl.sg = buf->sg; |
8ca84a50 | 965 | sg_init_table(sgl.sg, sgl.size); |
eb5e89fc | 966 | ret = __splice_from_pipe(pipe, &sd, pipe_to_sg); |
2b4fbf02 | 967 | pipe_unlock(pipe); |
eb5e89fc | 968 | if (likely(ret > 0)) |
276a3e95 | 969 | ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true); |
eb5e89fc | 970 | |
fe529537 | 971 | if (unlikely(ret <= 0)) |
1b637046 | 972 | free_buf(buf, true); |
eb5e89fc | 973 | return ret; |
2b4fbf02 YY |
974 | |
975 | error_out: | |
976 | pipe_unlock(pipe); | |
977 | return ret; | |
eb5e89fc MH |
978 | } |
979 | ||
2030fa49 AS |
980 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) |
981 | { | |
982 | struct port *port; | |
983 | unsigned int ret; | |
984 | ||
985 | port = filp->private_data; | |
986 | poll_wait(filp, &port->waitqueue, wait); | |
987 | ||
8529a504 AS |
988 | if (!port->guest_connected) { |
989 | /* Port got unplugged */ | |
990 | return POLLHUP; | |
991 | } | |
2030fa49 | 992 | ret = 0; |
6df7aadc | 993 | if (!will_read_block(port)) |
2030fa49 | 994 | ret |= POLLIN | POLLRDNORM; |
cdfadfc1 | 995 | if (!will_write_block(port)) |
2030fa49 AS |
996 | ret |= POLLOUT; |
997 | if (!port->host_connected) | |
998 | ret |= POLLHUP; | |
999 | ||
1000 | return ret; | |
1001 | } | |
1002 | ||
b353a6b8 AS |
1003 | static void remove_port(struct kref *kref); |
1004 | ||
2030fa49 AS |
1005 | static int port_fops_release(struct inode *inode, struct file *filp) |
1006 | { | |
1007 | struct port *port; | |
1008 | ||
1009 | port = filp->private_data; | |
1010 | ||
1011 | /* Notify host of port being closed */ | |
1012 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
1013 | ||
88f251ac | 1014 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
1015 | port->guest_connected = false; |
1016 | ||
88f251ac AS |
1017 | discard_port_data(port); |
1018 | ||
1019 | spin_unlock_irq(&port->inbuf_lock); | |
1020 | ||
cdfadfc1 AS |
1021 | spin_lock_irq(&port->outvq_lock); |
1022 | reclaim_consumed_buffers(port); | |
1023 | spin_unlock_irq(&port->outvq_lock); | |
1024 | ||
1b637046 | 1025 | reclaim_dma_bufs(); |
b353a6b8 AS |
1026 | /* |
1027 | * Locks aren't necessary here as a port can't be opened after | |
1028 | * unplug, and if a port isn't unplugged, a kref would already | |
1029 | * exist for the port. Plus, taking ports_lock here would | |
1030 | * create a dependency on other locks taken by functions | |
1031 | * inside remove_port if we're the last holder of the port, | |
1032 | * creating many problems. | |
1033 | */ | |
1034 | kref_put(&port->kref, remove_port); | |
1035 | ||
2030fa49 AS |
1036 | return 0; |
1037 | } | |
1038 | ||
1039 | static int port_fops_open(struct inode *inode, struct file *filp) | |
1040 | { | |
1041 | struct cdev *cdev = inode->i_cdev; | |
1042 | struct port *port; | |
8ad37e83 | 1043 | int ret; |
2030fa49 | 1044 | |
057b82be | 1045 | /* We get the port with a kref here */ |
04950cdf | 1046 | port = find_port_by_devt(cdev->dev); |
671bdea2 AS |
1047 | if (!port) { |
1048 | /* Port was unplugged before we could proceed */ | |
1049 | return -ENXIO; | |
1050 | } | |
2030fa49 AS |
1051 | filp->private_data = port; |
1052 | ||
1053 | /* | |
1054 | * Don't allow opening of console port devices -- that's done | |
1055 | * via /dev/hvc | |
1056 | */ | |
8ad37e83 AS |
1057 | if (is_console_port(port)) { |
1058 | ret = -ENXIO; | |
1059 | goto out; | |
1060 | } | |
2030fa49 | 1061 | |
3c7969cc AS |
1062 | /* Allow only one process to open a particular port at a time */ |
1063 | spin_lock_irq(&port->inbuf_lock); | |
1064 | if (port->guest_connected) { | |
1065 | spin_unlock_irq(&port->inbuf_lock); | |
74ff582c | 1066 | ret = -EBUSY; |
8ad37e83 | 1067 | goto out; |
3c7969cc AS |
1068 | } |
1069 | ||
1070 | port->guest_connected = true; | |
1071 | spin_unlock_irq(&port->inbuf_lock); | |
1072 | ||
cdfadfc1 AS |
1073 | spin_lock_irq(&port->outvq_lock); |
1074 | /* | |
1075 | * There might be a chance that we missed reclaiming a few | |
1076 | * buffers in the window of the port getting previously closed | |
1077 | * and opening now. | |
1078 | */ | |
1079 | reclaim_consumed_buffers(port); | |
1080 | spin_unlock_irq(&port->outvq_lock); | |
1081 | ||
299fb61c AS |
1082 | nonseekable_open(inode, filp); |
1083 | ||
2030fa49 AS |
1084 | /* Notify host of port being opened */ |
1085 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1086 | ||
1087 | return 0; | |
8ad37e83 | 1088 | out: |
b353a6b8 | 1089 | kref_put(&port->kref, remove_port); |
8ad37e83 | 1090 | return ret; |
2030fa49 AS |
1091 | } |
1092 | ||
3eae0ade AS |
1093 | static int port_fops_fasync(int fd, struct file *filp, int mode) |
1094 | { | |
1095 | struct port *port; | |
1096 | ||
1097 | port = filp->private_data; | |
1098 | return fasync_helper(fd, filp, mode, &port->async_queue); | |
1099 | } | |
1100 | ||
2030fa49 AS |
1101 | /* |
1102 | * The file operations that we support: programs in the guest can open | |
1103 | * a console device, read from it, write to it, poll for data and | |
1104 | * close it. The devices are at | |
1105 | * /dev/vport<device number>p<port number> | |
1106 | */ | |
1107 | static const struct file_operations port_fops = { | |
1108 | .owner = THIS_MODULE, | |
1109 | .open = port_fops_open, | |
1110 | .read = port_fops_read, | |
1111 | .write = port_fops_write, | |
eb5e89fc | 1112 | .splice_write = port_fops_splice_write, |
2030fa49 AS |
1113 | .poll = port_fops_poll, |
1114 | .release = port_fops_release, | |
3eae0ade | 1115 | .fasync = port_fops_fasync, |
299fb61c | 1116 | .llseek = no_llseek, |
2030fa49 AS |
1117 | }; |
1118 | ||
a23ea924 RR |
1119 | /* |
1120 | * The put_chars() callback is pretty straightforward. | |
31610434 | 1121 | * |
a23ea924 RR |
1122 | * We turn the characters into a scatter-gather list, add it to the |
1123 | * output queue and then kick the Host. Then we sit here waiting for | |
1124 | * it to finish: inefficient in theory, but in practice | |
1125 | * implementations will do it immediately (lguest's Launcher does). | |
1126 | */ | |
31610434 RR |
1127 | static int put_chars(u32 vtermno, const char *buf, int count) |
1128 | { | |
21206ede | 1129 | struct port *port; |
276a3e95 | 1130 | struct scatterlist sg[1]; |
38edf58d | 1131 | |
162a689a FD |
1132 | if (unlikely(early_put_chars)) |
1133 | return early_put_chars(vtermno, buf, count); | |
1134 | ||
38edf58d AS |
1135 | port = find_port_by_vtermno(vtermno); |
1136 | if (!port) | |
6dc69f97 | 1137 | return -EPIPE; |
31610434 | 1138 | |
276a3e95 SB |
1139 | sg_init_one(sg, buf, count); |
1140 | return __send_to_port(port, sg, 1, count, (void *)buf, false); | |
31610434 RR |
1141 | } |
1142 | ||
a23ea924 RR |
1143 | /* |
1144 | * get_chars() is the callback from the hvc_console infrastructure | |
1145 | * when an interrupt is received. | |
31610434 | 1146 | * |
203baab8 AS |
1147 | * We call out to fill_readbuf that gets us the required data from the |
1148 | * buffers that are queued up. | |
a23ea924 | 1149 | */ |
31610434 RR |
1150 | static int get_chars(u32 vtermno, char *buf, int count) |
1151 | { | |
21206ede RR |
1152 | struct port *port; |
1153 | ||
6dc69f97 AS |
1154 | /* If we've not set up the port yet, we have no input to give. */ |
1155 | if (unlikely(early_put_chars)) | |
1156 | return 0; | |
1157 | ||
38edf58d AS |
1158 | port = find_port_by_vtermno(vtermno); |
1159 | if (!port) | |
6dc69f97 | 1160 | return -EPIPE; |
21206ede | 1161 | |
31610434 | 1162 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 1163 | BUG_ON(!port->in_vq); |
31610434 | 1164 | |
b766ceed | 1165 | return fill_readbuf(port, buf, count, false); |
31610434 | 1166 | } |
31610434 | 1167 | |
cb06e367 | 1168 | static void resize_console(struct port *port) |
c2983458 | 1169 | { |
cb06e367 | 1170 | struct virtio_device *vdev; |
c2983458 | 1171 | |
2de16a49 | 1172 | /* The port could have been hot-unplugged */ |
9778829c | 1173 | if (!port || !is_console_port(port)) |
2de16a49 AS |
1174 | return; |
1175 | ||
cb06e367 | 1176 | vdev = port->portdev->vdev; |
1b637046 SB |
1177 | |
1178 | /* Don't test F_SIZE at all if we're rproc: not a valid feature! */ | |
1179 | if (!is_rproc_serial(vdev) && | |
1180 | virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) | |
9778829c | 1181 | hvc_resize(port->cons.hvc, port->cons.ws); |
c2983458 CB |
1182 | } |
1183 | ||
38edf58d | 1184 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
1185 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
1186 | { | |
38edf58d AS |
1187 | struct port *port; |
1188 | ||
1189 | port = find_port_by_vtermno(hp->vtermno); | |
1190 | if (!port) | |
1191 | return -EINVAL; | |
1192 | ||
91fcad19 | 1193 | hp->irq_requested = 1; |
cb06e367 | 1194 | resize_console(port); |
c2983458 | 1195 | |
91fcad19 CB |
1196 | return 0; |
1197 | } | |
1198 | ||
1199 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
1200 | { | |
1201 | hp->irq_requested = 0; | |
1202 | } | |
1203 | ||
17634ba2 | 1204 | /* The operations for console ports. */ |
1dff3996 | 1205 | static const struct hv_ops hv_ops = { |
971f3390 RR |
1206 | .get_chars = get_chars, |
1207 | .put_chars = put_chars, | |
1208 | .notifier_add = notifier_add_vio, | |
1209 | .notifier_del = notifier_del_vio, | |
1210 | .notifier_hangup = notifier_del_vio, | |
1211 | }; | |
1212 | ||
1213 | /* | |
1214 | * Console drivers are initialized very early so boot messages can go | |
1215 | * out, so we do things slightly differently from the generic virtio | |
1216 | * initialization of the net and block drivers. | |
1217 | * | |
1218 | * At this stage, the console is output-only. It's too early to set | |
1219 | * up a virtqueue, so we let the drivers do some boutique early-output | |
1220 | * thing. | |
1221 | */ | |
1222 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
1223 | { | |
1224 | early_put_chars = put_chars; | |
1225 | return hvc_instantiate(0, 0, &hv_ops); | |
1226 | } | |
1227 | ||
3826835a | 1228 | static int init_port_console(struct port *port) |
cfa6d379 AS |
1229 | { |
1230 | int ret; | |
1231 | ||
1232 | /* | |
1233 | * The Host's telling us this port is a console port. Hook it | |
1234 | * up with an hvc console. | |
1235 | * | |
1236 | * To set up and manage our virtual console, we call | |
1237 | * hvc_alloc(). | |
1238 | * | |
1239 | * The first argument of hvc_alloc() is the virtual console | |
1240 | * number. The second argument is the parameter for the | |
1241 | * notification mechanism (like irq number). We currently | |
1242 | * leave this as zero, virtqueues have implicit notifications. | |
1243 | * | |
1244 | * The third argument is a "struct hv_ops" containing the | |
1245 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
1246 | * pointers. The final argument is the output buffer size: we | |
1247 | * can do any size, so we put PAGE_SIZE here. | |
1248 | */ | |
1249 | port->cons.vtermno = pdrvdata.next_vtermno; | |
1250 | ||
1251 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
1252 | if (IS_ERR(port->cons.hvc)) { | |
1253 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
1254 | dev_err(port->dev, |
1255 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
1256 | port->cons.hvc = NULL; |
1257 | return ret; | |
1258 | } | |
1259 | spin_lock_irq(&pdrvdata_lock); | |
1260 | pdrvdata.next_vtermno++; | |
1261 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
1262 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 1263 | port->guest_connected = true; |
cfa6d379 | 1264 | |
1d05160b AS |
1265 | /* |
1266 | * Start using the new console output if this is the first | |
1267 | * console to come up. | |
1268 | */ | |
1269 | if (early_put_chars) | |
1270 | early_put_chars = NULL; | |
1271 | ||
2030fa49 AS |
1272 | /* Notify host of port being opened */ |
1273 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1274 | ||
cfa6d379 AS |
1275 | return 0; |
1276 | } | |
1277 | ||
431edb8a AS |
1278 | static ssize_t show_port_name(struct device *dev, |
1279 | struct device_attribute *attr, char *buffer) | |
1280 | { | |
1281 | struct port *port; | |
1282 | ||
1283 | port = dev_get_drvdata(dev); | |
1284 | ||
1285 | return sprintf(buffer, "%s\n", port->name); | |
1286 | } | |
1287 | ||
1288 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
1289 | ||
1290 | static struct attribute *port_sysfs_entries[] = { | |
1291 | &dev_attr_name.attr, | |
1292 | NULL | |
1293 | }; | |
1294 | ||
1295 | static struct attribute_group port_attribute_group = { | |
1296 | .name = NULL, /* put in device directory */ | |
1297 | .attrs = port_sysfs_entries, | |
1298 | }; | |
1299 | ||
d99393ef AS |
1300 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, |
1301 | size_t count, loff_t *offp) | |
1302 | { | |
1303 | struct port *port; | |
1304 | char *buf; | |
1305 | ssize_t ret, out_offset, out_count; | |
1306 | ||
1307 | out_count = 1024; | |
1308 | buf = kmalloc(out_count, GFP_KERNEL); | |
1309 | if (!buf) | |
1310 | return -ENOMEM; | |
1311 | ||
1312 | port = filp->private_data; | |
1313 | out_offset = 0; | |
1314 | out_offset += snprintf(buf + out_offset, out_count, | |
1315 | "name: %s\n", port->name ? port->name : ""); | |
1316 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1317 | "guest_connected: %d\n", port->guest_connected); | |
1318 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1319 | "host_connected: %d\n", port->host_connected); | |
cdfadfc1 AS |
1320 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1321 | "outvq_full: %d\n", port->outvq_full); | |
17e5b4f2 AS |
1322 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1323 | "bytes_sent: %lu\n", port->stats.bytes_sent); | |
1324 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1325 | "bytes_received: %lu\n", | |
1326 | port->stats.bytes_received); | |
1327 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1328 | "bytes_discarded: %lu\n", | |
1329 | port->stats.bytes_discarded); | |
d99393ef AS |
1330 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1331 | "is_console: %s\n", | |
1332 | is_console_port(port) ? "yes" : "no"); | |
1333 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1334 | "console_vtermno: %u\n", port->cons.vtermno); | |
1335 | ||
1336 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
1337 | kfree(buf); | |
1338 | return ret; | |
1339 | } | |
1340 | ||
1341 | static const struct file_operations port_debugfs_ops = { | |
1342 | .owner = THIS_MODULE, | |
234e3405 | 1343 | .open = simple_open, |
d99393ef AS |
1344 | .read = debugfs_read, |
1345 | }; | |
1346 | ||
9778829c AS |
1347 | static void set_console_size(struct port *port, u16 rows, u16 cols) |
1348 | { | |
1349 | if (!port || !is_console_port(port)) | |
1350 | return; | |
1351 | ||
1352 | port->cons.ws.ws_row = rows; | |
1353 | port->cons.ws.ws_col = cols; | |
1354 | } | |
1355 | ||
c446f8fc AS |
1356 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
1357 | { | |
1358 | struct port_buffer *buf; | |
1359 | unsigned int nr_added_bufs; | |
1360 | int ret; | |
1361 | ||
1362 | nr_added_bufs = 0; | |
1363 | do { | |
276a3e95 | 1364 | buf = alloc_buf(vq, PAGE_SIZE, 0); |
c446f8fc AS |
1365 | if (!buf) |
1366 | break; | |
1367 | ||
1368 | spin_lock_irq(lock); | |
1369 | ret = add_inbuf(vq, buf); | |
1370 | if (ret < 0) { | |
1371 | spin_unlock_irq(lock); | |
1b637046 | 1372 | free_buf(buf, true); |
c446f8fc AS |
1373 | break; |
1374 | } | |
1375 | nr_added_bufs++; | |
1376 | spin_unlock_irq(lock); | |
1377 | } while (ret > 0); | |
1378 | ||
1379 | return nr_added_bufs; | |
1380 | } | |
1381 | ||
3eae0ade AS |
1382 | static void send_sigio_to_port(struct port *port) |
1383 | { | |
1384 | if (port->async_queue && port->guest_connected) | |
1385 | kill_fasync(&port->async_queue, SIGIO, POLL_OUT); | |
1386 | } | |
1387 | ||
c446f8fc AS |
1388 | static int add_port(struct ports_device *portdev, u32 id) |
1389 | { | |
1390 | char debugfs_name[16]; | |
1391 | struct port *port; | |
1392 | struct port_buffer *buf; | |
1393 | dev_t devt; | |
1394 | unsigned int nr_added_bufs; | |
1395 | int err; | |
1396 | ||
1397 | port = kmalloc(sizeof(*port), GFP_KERNEL); | |
1398 | if (!port) { | |
1399 | err = -ENOMEM; | |
1400 | goto fail; | |
1401 | } | |
b353a6b8 | 1402 | kref_init(&port->kref); |
c446f8fc AS |
1403 | |
1404 | port->portdev = portdev; | |
1405 | port->id = id; | |
1406 | ||
1407 | port->name = NULL; | |
1408 | port->inbuf = NULL; | |
1409 | port->cons.hvc = NULL; | |
3eae0ade | 1410 | port->async_queue = NULL; |
c446f8fc | 1411 | |
9778829c AS |
1412 | port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
1413 | ||
c446f8fc | 1414 | port->host_connected = port->guest_connected = false; |
17e5b4f2 | 1415 | port->stats = (struct port_stats) { 0 }; |
c446f8fc | 1416 | |
cdfadfc1 AS |
1417 | port->outvq_full = false; |
1418 | ||
c446f8fc AS |
1419 | port->in_vq = portdev->in_vqs[port->id]; |
1420 | port->out_vq = portdev->out_vqs[port->id]; | |
1421 | ||
d22a6989 AS |
1422 | port->cdev = cdev_alloc(); |
1423 | if (!port->cdev) { | |
1424 | dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); | |
1425 | err = -ENOMEM; | |
1426 | goto free_port; | |
1427 | } | |
1428 | port->cdev->ops = &port_fops; | |
c446f8fc AS |
1429 | |
1430 | devt = MKDEV(portdev->chr_major, id); | |
d22a6989 | 1431 | err = cdev_add(port->cdev, devt, 1); |
c446f8fc AS |
1432 | if (err < 0) { |
1433 | dev_err(&port->portdev->vdev->dev, | |
1434 | "Error %d adding cdev for port %u\n", err, id); | |
d22a6989 | 1435 | goto free_cdev; |
c446f8fc AS |
1436 | } |
1437 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1438 | devt, port, "vport%up%u", | |
dc18f080 | 1439 | port->portdev->vdev->index, id); |
c446f8fc AS |
1440 | if (IS_ERR(port->dev)) { |
1441 | err = PTR_ERR(port->dev); | |
1442 | dev_err(&port->portdev->vdev->dev, | |
1443 | "Error %d creating device for port %u\n", | |
1444 | err, id); | |
1445 | goto free_cdev; | |
1446 | } | |
1447 | ||
1448 | spin_lock_init(&port->inbuf_lock); | |
cdfadfc1 | 1449 | spin_lock_init(&port->outvq_lock); |
c446f8fc AS |
1450 | init_waitqueue_head(&port->waitqueue); |
1451 | ||
1452 | /* Fill the in_vq with buffers so the host can send us data. */ | |
1453 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); | |
1454 | if (!nr_added_bufs) { | |
1455 | dev_err(port->dev, "Error allocating inbufs\n"); | |
1456 | err = -ENOMEM; | |
1457 | goto free_device; | |
1458 | } | |
1459 | ||
1b637046 SB |
1460 | if (is_rproc_serial(port->portdev->vdev)) |
1461 | /* | |
1462 | * For rproc_serial assume remote processor is connected. | |
1463 | * rproc_serial does not want the console port, only | |
1464 | * the generic port implementation. | |
1465 | */ | |
aabd6a8f | 1466 | port->host_connected = true; |
1b637046 SB |
1467 | else if (!use_multiport(port->portdev)) { |
1468 | /* | |
1469 | * If we're not using multiport support, | |
1470 | * this has to be a console port. | |
1471 | */ | |
c446f8fc AS |
1472 | err = init_port_console(port); |
1473 | if (err) | |
1474 | goto free_inbufs; | |
1475 | } | |
1476 | ||
1477 | spin_lock_irq(&portdev->ports_lock); | |
1478 | list_add_tail(&port->list, &port->portdev->ports); | |
1479 | spin_unlock_irq(&portdev->ports_lock); | |
1480 | ||
1481 | /* | |
1482 | * Tell the Host we're set so that it can send us various | |
1483 | * configuration parameters for this port (eg, port name, | |
1484 | * caching, whether this is a console port, etc.) | |
1485 | */ | |
1486 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
1487 | ||
1488 | if (pdrvdata.debugfs_dir) { | |
1489 | /* | |
1490 | * Finally, create the debugfs file that we can use to | |
1491 | * inspect a port's state at any time | |
1492 | */ | |
1493 | sprintf(debugfs_name, "vport%up%u", | |
dc18f080 | 1494 | port->portdev->vdev->index, id); |
c446f8fc AS |
1495 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, |
1496 | pdrvdata.debugfs_dir, | |
1497 | port, | |
1498 | &port_debugfs_ops); | |
1499 | } | |
1500 | return 0; | |
1501 | ||
1502 | free_inbufs: | |
1503 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1b637046 | 1504 | free_buf(buf, true); |
c446f8fc AS |
1505 | free_device: |
1506 | device_destroy(pdrvdata.class, port->dev->devt); | |
1507 | free_cdev: | |
d22a6989 | 1508 | cdev_del(port->cdev); |
c446f8fc AS |
1509 | free_port: |
1510 | kfree(port); | |
1511 | fail: | |
1512 | /* The host might want to notify management sw about port add failure */ | |
0643e4c6 | 1513 | __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
c446f8fc AS |
1514 | return err; |
1515 | } | |
1516 | ||
b353a6b8 AS |
1517 | /* No users remain, remove all port-specific data. */ |
1518 | static void remove_port(struct kref *kref) | |
1519 | { | |
1520 | struct port *port; | |
1521 | ||
1522 | port = container_of(kref, struct port, kref); | |
1523 | ||
b353a6b8 AS |
1524 | kfree(port); |
1525 | } | |
1526 | ||
a0e2dbfc AS |
1527 | static void remove_port_data(struct port *port) |
1528 | { | |
1529 | struct port_buffer *buf; | |
1530 | ||
c6017e79 | 1531 | spin_lock_irq(&port->inbuf_lock); |
a0e2dbfc AS |
1532 | /* Remove unused data this port might have received. */ |
1533 | discard_port_data(port); | |
1534 | ||
a0e2dbfc AS |
1535 | /* Remove buffers we queued up for the Host to send us data in. */ |
1536 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1b637046 | 1537 | free_buf(buf, true); |
c6017e79 AS |
1538 | spin_unlock_irq(&port->inbuf_lock); |
1539 | ||
1540 | spin_lock_irq(&port->outvq_lock); | |
1541 | reclaim_consumed_buffers(port); | |
eb34f12b | 1542 | |
1543 | /* Free pending buffers from the out-queue. */ | |
1544 | while ((buf = virtqueue_detach_unused_buf(port->out_vq))) | |
1b637046 | 1545 | free_buf(buf, true); |
c6017e79 | 1546 | spin_unlock_irq(&port->outvq_lock); |
a0e2dbfc AS |
1547 | } |
1548 | ||
b353a6b8 AS |
1549 | /* |
1550 | * Port got unplugged. Remove port from portdev's list and drop the | |
1551 | * kref reference. If no userspace has this port opened, it will | |
1552 | * result in immediate removal the port. | |
1553 | */ | |
1554 | static void unplug_port(struct port *port) | |
1f7aa42d | 1555 | { |
b353a6b8 AS |
1556 | spin_lock_irq(&port->portdev->ports_lock); |
1557 | list_del(&port->list); | |
1558 | spin_unlock_irq(&port->portdev->ports_lock); | |
1559 | ||
5549fb25 | 1560 | spin_lock_irq(&port->inbuf_lock); |
0047634d | 1561 | if (port->guest_connected) { |
92d34538 AS |
1562 | /* Let the app know the port is going down. */ |
1563 | send_sigio_to_port(port); | |
1564 | ||
1565 | /* Do this after sigio is actually sent */ | |
0047634d AS |
1566 | port->guest_connected = false; |
1567 | port->host_connected = false; | |
a461e11e | 1568 | |
92d34538 | 1569 | wake_up_interruptible(&port->waitqueue); |
0047634d | 1570 | } |
5549fb25 | 1571 | spin_unlock_irq(&port->inbuf_lock); |
0047634d | 1572 | |
1f7aa42d AS |
1573 | if (is_console_port(port)) { |
1574 | spin_lock_irq(&pdrvdata_lock); | |
1575 | list_del(&port->cons.list); | |
1576 | spin_unlock_irq(&pdrvdata_lock); | |
1577 | hvc_remove(port->cons.hvc); | |
1578 | } | |
1f7aa42d | 1579 | |
a0e2dbfc | 1580 | remove_port_data(port); |
a9cdd485 | 1581 | |
b353a6b8 AS |
1582 | /* |
1583 | * We should just assume the device itself has gone off -- | |
1584 | * else a close on an open port later will try to send out a | |
1585 | * control message. | |
1586 | */ | |
1587 | port->portdev = NULL; | |
d99393ef | 1588 | |
ea3768b4 AS |
1589 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); |
1590 | device_destroy(pdrvdata.class, port->dev->devt); | |
1591 | cdev_del(port->cdev); | |
1592 | ||
ea3768b4 | 1593 | debugfs_remove(port->debugfs_file); |
3b868a40 | 1594 | kfree(port->name); |
ea3768b4 | 1595 | |
b353a6b8 AS |
1596 | /* |
1597 | * Locks around here are not necessary - a port can't be | |
1598 | * opened after we removed the port struct from ports_list | |
1599 | * above. | |
1600 | */ | |
1601 | kref_put(&port->kref, remove_port); | |
1f7aa42d AS |
1602 | } |
1603 | ||
17634ba2 AS |
1604 | /* Any private messages that the Host and Guest want to share */ |
1605 | static void handle_control_message(struct ports_device *portdev, | |
1606 | struct port_buffer *buf) | |
1607 | { | |
1608 | struct virtio_console_control *cpkt; | |
1609 | struct port *port; | |
431edb8a AS |
1610 | size_t name_size; |
1611 | int err; | |
17634ba2 AS |
1612 | |
1613 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
1614 | ||
1615 | port = find_port_by_id(portdev, cpkt->id); | |
f909f850 | 1616 | if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) { |
17634ba2 AS |
1617 | /* No valid header at start of buffer. Drop it. */ |
1618 | dev_dbg(&portdev->vdev->dev, | |
1619 | "Invalid index %u in control packet\n", cpkt->id); | |
1620 | return; | |
1621 | } | |
1622 | ||
1623 | switch (cpkt->event) { | |
f909f850 AS |
1624 | case VIRTIO_CONSOLE_PORT_ADD: |
1625 | if (port) { | |
1d05160b AS |
1626 | dev_dbg(&portdev->vdev->dev, |
1627 | "Port %u already added\n", port->id); | |
f909f850 AS |
1628 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
1629 | break; | |
1630 | } | |
1631 | if (cpkt->id >= portdev->config.max_nr_ports) { | |
1632 | dev_warn(&portdev->vdev->dev, | |
1633 | "Request for adding port with out-of-bound id %u, max. supported id: %u\n", | |
1634 | cpkt->id, portdev->config.max_nr_ports - 1); | |
1635 | break; | |
1636 | } | |
1637 | add_port(portdev, cpkt->id); | |
1638 | break; | |
1639 | case VIRTIO_CONSOLE_PORT_REMOVE: | |
b353a6b8 | 1640 | unplug_port(port); |
f909f850 | 1641 | break; |
17634ba2 AS |
1642 | case VIRTIO_CONSOLE_CONSOLE_PORT: |
1643 | if (!cpkt->value) | |
1644 | break; | |
1645 | if (is_console_port(port)) | |
1646 | break; | |
1647 | ||
1648 | init_port_console(port); | |
5e38483b | 1649 | complete(&early_console_added); |
17634ba2 AS |
1650 | /* |
1651 | * Could remove the port here in case init fails - but | |
1652 | * have to notify the host first. | |
1653 | */ | |
1654 | break; | |
8345adbf AS |
1655 | case VIRTIO_CONSOLE_RESIZE: { |
1656 | struct { | |
1657 | __u16 rows; | |
1658 | __u16 cols; | |
1659 | } size; | |
1660 | ||
17634ba2 AS |
1661 | if (!is_console_port(port)) |
1662 | break; | |
8345adbf AS |
1663 | |
1664 | memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), | |
1665 | sizeof(size)); | |
1666 | set_console_size(port, size.rows, size.cols); | |
1667 | ||
17634ba2 AS |
1668 | port->cons.hvc->irq_requested = 1; |
1669 | resize_console(port); | |
1670 | break; | |
8345adbf | 1671 | } |
2030fa49 AS |
1672 | case VIRTIO_CONSOLE_PORT_OPEN: |
1673 | port->host_connected = cpkt->value; | |
1674 | wake_up_interruptible(&port->waitqueue); | |
cdfadfc1 AS |
1675 | /* |
1676 | * If the host port got closed and the host had any | |
1677 | * unconsumed buffers, we'll be able to reclaim them | |
1678 | * now. | |
1679 | */ | |
1680 | spin_lock_irq(&port->outvq_lock); | |
1681 | reclaim_consumed_buffers(port); | |
1682 | spin_unlock_irq(&port->outvq_lock); | |
3eae0ade AS |
1683 | |
1684 | /* | |
1685 | * If the guest is connected, it'll be interested in | |
1686 | * knowing the host connection state changed. | |
1687 | */ | |
314081f1 | 1688 | spin_lock_irq(&port->inbuf_lock); |
3eae0ade | 1689 | send_sigio_to_port(port); |
314081f1 | 1690 | spin_unlock_irq(&port->inbuf_lock); |
2030fa49 | 1691 | break; |
431edb8a | 1692 | case VIRTIO_CONSOLE_PORT_NAME: |
291024ef AS |
1693 | /* |
1694 | * If we woke up after hibernation, we can get this | |
1695 | * again. Skip it in that case. | |
1696 | */ | |
1697 | if (port->name) | |
1698 | break; | |
1699 | ||
431edb8a AS |
1700 | /* |
1701 | * Skip the size of the header and the cpkt to get the size | |
1702 | * of the name that was sent | |
1703 | */ | |
1704 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
1705 | ||
1706 | port->name = kmalloc(name_size, GFP_KERNEL); | |
1707 | if (!port->name) { | |
1708 | dev_err(port->dev, | |
1709 | "Not enough space to store port name\n"); | |
1710 | break; | |
1711 | } | |
1712 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
1713 | name_size - 1); | |
1714 | port->name[name_size - 1] = 0; | |
1715 | ||
1716 | /* | |
1717 | * Since we only have one sysfs attribute, 'name', | |
1718 | * create it only if we have a name for the port. | |
1719 | */ | |
1720 | err = sysfs_create_group(&port->dev->kobj, | |
1721 | &port_attribute_group); | |
ec64213c | 1722 | if (err) { |
431edb8a AS |
1723 | dev_err(port->dev, |
1724 | "Error %d creating sysfs device attributes\n", | |
1725 | err); | |
ec64213c AS |
1726 | } else { |
1727 | /* | |
1728 | * Generate a udev event so that appropriate | |
1729 | * symlinks can be created based on udev | |
1730 | * rules. | |
1731 | */ | |
1732 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
1733 | } | |
431edb8a | 1734 | break; |
17634ba2 AS |
1735 | } |
1736 | } | |
1737 | ||
1738 | static void control_work_handler(struct work_struct *work) | |
1739 | { | |
1740 | struct ports_device *portdev; | |
1741 | struct virtqueue *vq; | |
1742 | struct port_buffer *buf; | |
1743 | unsigned int len; | |
1744 | ||
1745 | portdev = container_of(work, struct ports_device, control_work); | |
1746 | vq = portdev->c_ivq; | |
1747 | ||
165b1b8b | 1748 | spin_lock(&portdev->c_ivq_lock); |
505b0451 | 1749 | while ((buf = virtqueue_get_buf(vq, &len))) { |
165b1b8b | 1750 | spin_unlock(&portdev->c_ivq_lock); |
17634ba2 AS |
1751 | |
1752 | buf->len = len; | |
1753 | buf->offset = 0; | |
1754 | ||
1755 | handle_control_message(portdev, buf); | |
1756 | ||
165b1b8b | 1757 | spin_lock(&portdev->c_ivq_lock); |
17634ba2 AS |
1758 | if (add_inbuf(portdev->c_ivq, buf) < 0) { |
1759 | dev_warn(&portdev->vdev->dev, | |
1760 | "Error adding buffer to queue\n"); | |
1b637046 | 1761 | free_buf(buf, false); |
17634ba2 AS |
1762 | } |
1763 | } | |
165b1b8b | 1764 | spin_unlock(&portdev->c_ivq_lock); |
17634ba2 AS |
1765 | } |
1766 | ||
2770c5ea AS |
1767 | static void out_intr(struct virtqueue *vq) |
1768 | { | |
1769 | struct port *port; | |
1770 | ||
1771 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1772 | if (!port) | |
1773 | return; | |
1774 | ||
1775 | wake_up_interruptible(&port->waitqueue); | |
1776 | } | |
1777 | ||
17634ba2 AS |
1778 | static void in_intr(struct virtqueue *vq) |
1779 | { | |
1780 | struct port *port; | |
1781 | unsigned long flags; | |
1782 | ||
1783 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1784 | if (!port) | |
1785 | return; | |
1786 | ||
1787 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d25a9dda | 1788 | port->inbuf = get_inbuf(port); |
17634ba2 | 1789 | |
88f251ac | 1790 | /* |
aabd6a8f SB |
1791 | * Normally the port should not accept data when the port is |
1792 | * closed. For generic serial ports, the host won't (shouldn't) | |
1793 | * send data till the guest is connected. But this condition | |
88f251ac | 1794 | * can be reached when a console port is not yet connected (no |
aabd6a8f SB |
1795 | * tty is spawned) and the other side sends out data over the |
1796 | * vring, or when a remote devices start sending data before | |
1797 | * the ports are opened. | |
1798 | * | |
1799 | * A generic serial port will discard data if not connected, | |
1800 | * while console ports and rproc-serial ports accepts data at | |
1801 | * any time. rproc-serial is initiated with guest_connected to | |
1802 | * false because port_fops_open expects this. Console ports are | |
1803 | * hooked up with an HVC console and is initialized with | |
1804 | * guest_connected to true. | |
88f251ac | 1805 | */ |
aabd6a8f SB |
1806 | |
1807 | if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev)) | |
88f251ac AS |
1808 | discard_port_data(port); |
1809 | ||
314081f1 AS |
1810 | /* Send a SIGIO indicating new data in case the process asked for it */ |
1811 | send_sigio_to_port(port); | |
1812 | ||
17634ba2 AS |
1813 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1814 | ||
2030fa49 AS |
1815 | wake_up_interruptible(&port->waitqueue); |
1816 | ||
17634ba2 AS |
1817 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1818 | hvc_kick(); | |
1819 | } | |
1820 | ||
1821 | static void control_intr(struct virtqueue *vq) | |
1822 | { | |
1823 | struct ports_device *portdev; | |
1824 | ||
1825 | portdev = vq->vdev->priv; | |
1826 | schedule_work(&portdev->control_work); | |
1827 | } | |
1828 | ||
7f5d810d AS |
1829 | static void config_intr(struct virtio_device *vdev) |
1830 | { | |
1831 | struct ports_device *portdev; | |
1832 | ||
1833 | portdev = vdev->priv; | |
99f905f8 | 1834 | |
4038f5b7 | 1835 | if (!use_multiport(portdev)) { |
9778829c AS |
1836 | struct port *port; |
1837 | u16 rows, cols; | |
1838 | ||
855e0c52 RR |
1839 | virtio_cread(vdev, struct virtio_console_config, cols, &cols); |
1840 | virtio_cread(vdev, struct virtio_console_config, rows, &rows); | |
9778829c AS |
1841 | |
1842 | port = find_port_by_id(portdev, 0); | |
1843 | set_console_size(port, rows, cols); | |
1844 | ||
4038f5b7 AS |
1845 | /* |
1846 | * We'll use this way of resizing only for legacy | |
1847 | * support. For newer userspace | |
1848 | * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages | |
1849 | * to indicate console size changes so that it can be | |
1850 | * done per-port. | |
1851 | */ | |
9778829c | 1852 | resize_console(port); |
4038f5b7 | 1853 | } |
7f5d810d AS |
1854 | } |
1855 | ||
2658a79a AS |
1856 | static int init_vqs(struct ports_device *portdev) |
1857 | { | |
1858 | vq_callback_t **io_callbacks; | |
1859 | char **io_names; | |
1860 | struct virtqueue **vqs; | |
17634ba2 | 1861 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1862 | int err; |
1863 | ||
17634ba2 AS |
1864 | nr_ports = portdev->config.max_nr_ports; |
1865 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1866 | |
1867 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
2658a79a | 1868 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); |
2658a79a | 1869 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); |
2658a79a AS |
1870 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1871 | GFP_KERNEL); | |
2658a79a AS |
1872 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1873 | GFP_KERNEL); | |
22e132ff | 1874 | if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || |
286f9a22 | 1875 | !portdev->out_vqs) { |
2658a79a | 1876 | err = -ENOMEM; |
22e132ff | 1877 | goto free; |
2658a79a AS |
1878 | } |
1879 | ||
17634ba2 AS |
1880 | /* |
1881 | * For backward compat (newer host but older guest), the host | |
1882 | * spawns a console port first and also inits the vqs for port | |
1883 | * 0 before others. | |
1884 | */ | |
1885 | j = 0; | |
1886 | io_callbacks[j] = in_intr; | |
2770c5ea | 1887 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1888 | io_names[j] = "input"; |
1889 | io_names[j + 1] = "output"; | |
1890 | j += 2; | |
1891 | ||
1892 | if (use_multiport(portdev)) { | |
1893 | io_callbacks[j] = control_intr; | |
1894 | io_callbacks[j + 1] = NULL; | |
1895 | io_names[j] = "control-i"; | |
1896 | io_names[j + 1] = "control-o"; | |
1897 | ||
1898 | for (i = 1; i < nr_ports; i++) { | |
1899 | j += 2; | |
1900 | io_callbacks[j] = in_intr; | |
2770c5ea | 1901 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1902 | io_names[j] = "input"; |
1903 | io_names[j + 1] = "output"; | |
1904 | } | |
1905 | } | |
2658a79a AS |
1906 | /* Find the queues. */ |
1907 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1908 | io_callbacks, | |
1909 | (const char **)io_names); | |
1910 | if (err) | |
22e132ff | 1911 | goto free; |
2658a79a | 1912 | |
17634ba2 | 1913 | j = 0; |
2658a79a AS |
1914 | portdev->in_vqs[0] = vqs[0]; |
1915 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1916 | j += 2; |
1917 | if (use_multiport(portdev)) { | |
1918 | portdev->c_ivq = vqs[j]; | |
1919 | portdev->c_ovq = vqs[j + 1]; | |
1920 | ||
1921 | for (i = 1; i < nr_ports; i++) { | |
1922 | j += 2; | |
1923 | portdev->in_vqs[i] = vqs[j]; | |
1924 | portdev->out_vqs[i] = vqs[j + 1]; | |
1925 | } | |
1926 | } | |
2658a79a | 1927 | kfree(io_names); |
22e132ff | 1928 | kfree(io_callbacks); |
2658a79a AS |
1929 | kfree(vqs); |
1930 | ||
1931 | return 0; | |
1932 | ||
22e132ff | 1933 | free: |
2658a79a | 1934 | kfree(portdev->out_vqs); |
2658a79a | 1935 | kfree(portdev->in_vqs); |
22e132ff JS |
1936 | kfree(io_names); |
1937 | kfree(io_callbacks); | |
2658a79a | 1938 | kfree(vqs); |
22e132ff | 1939 | |
2658a79a AS |
1940 | return err; |
1941 | } | |
1942 | ||
fb08bd27 AS |
1943 | static const struct file_operations portdev_fops = { |
1944 | .owner = THIS_MODULE, | |
1945 | }; | |
1946 | ||
a0e2dbfc AS |
1947 | static void remove_vqs(struct ports_device *portdev) |
1948 | { | |
1949 | portdev->vdev->config->del_vqs(portdev->vdev); | |
1950 | kfree(portdev->in_vqs); | |
1951 | kfree(portdev->out_vqs); | |
1952 | } | |
1953 | ||
1954 | static void remove_controlq_data(struct ports_device *portdev) | |
1955 | { | |
1956 | struct port_buffer *buf; | |
1957 | unsigned int len; | |
1958 | ||
1959 | if (!use_multiport(portdev)) | |
1960 | return; | |
1961 | ||
1962 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) | |
1b637046 | 1963 | free_buf(buf, true); |
a0e2dbfc AS |
1964 | |
1965 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) | |
1b637046 | 1966 | free_buf(buf, true); |
a0e2dbfc AS |
1967 | } |
1968 | ||
1c85bf35 AS |
1969 | /* |
1970 | * Once we're further in boot, we get probed like any other virtio | |
1971 | * device. | |
17634ba2 AS |
1972 | * |
1973 | * If the host also supports multiple console ports, we check the | |
1974 | * config space to see how many ports the host has spawned. We | |
1975 | * initialize each port found. | |
1c85bf35 | 1976 | */ |
2223cbec | 1977 | static int virtcons_probe(struct virtio_device *vdev) |
1c85bf35 | 1978 | { |
1c85bf35 AS |
1979 | struct ports_device *portdev; |
1980 | int err; | |
17634ba2 | 1981 | bool multiport; |
5e38483b CB |
1982 | bool early = early_put_chars != NULL; |
1983 | ||
1984 | /* Ensure to read early_put_chars now */ | |
1985 | barrier(); | |
1c85bf35 AS |
1986 | |
1987 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1988 | if (!portdev) { | |
1989 | err = -ENOMEM; | |
1990 | goto fail; | |
1991 | } | |
1992 | ||
1993 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1994 | portdev->vdev = vdev; | |
1995 | vdev->priv = portdev; | |
1996 | ||
fb08bd27 AS |
1997 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", |
1998 | &portdev_fops); | |
1999 | if (portdev->chr_major < 0) { | |
2000 | dev_err(&vdev->dev, | |
2001 | "Error %d registering chrdev for device %u\n", | |
dc18f080 | 2002 | portdev->chr_major, vdev->index); |
fb08bd27 AS |
2003 | err = portdev->chr_major; |
2004 | goto free; | |
2005 | } | |
2006 | ||
17634ba2 | 2007 | multiport = false; |
17634ba2 | 2008 | portdev->config.max_nr_ports = 1; |
1b637046 SB |
2009 | |
2010 | /* Don't test MULTIPORT at all if we're rproc: not a valid feature! */ | |
2011 | if (!is_rproc_serial(vdev) && | |
855e0c52 RR |
2012 | virtio_cread_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT, |
2013 | struct virtio_console_config, max_nr_ports, | |
2014 | &portdev->config.max_nr_ports) == 0) { | |
17634ba2 | 2015 | multiport = true; |
1b637046 | 2016 | } |
17634ba2 | 2017 | |
2658a79a AS |
2018 | err = init_vqs(portdev); |
2019 | if (err < 0) { | |
2020 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 2021 | goto free_chrdev; |
2658a79a | 2022 | } |
1c85bf35 | 2023 | |
17634ba2 AS |
2024 | spin_lock_init(&portdev->ports_lock); |
2025 | INIT_LIST_HEAD(&portdev->ports); | |
2026 | ||
2027 | if (multiport) { | |
335a64a5 AS |
2028 | unsigned int nr_added_bufs; |
2029 | ||
165b1b8b | 2030 | spin_lock_init(&portdev->c_ivq_lock); |
9ba5c80b | 2031 | spin_lock_init(&portdev->c_ovq_lock); |
17634ba2 AS |
2032 | INIT_WORK(&portdev->control_work, &control_work_handler); |
2033 | ||
165b1b8b AS |
2034 | nr_added_bufs = fill_queue(portdev->c_ivq, |
2035 | &portdev->c_ivq_lock); | |
335a64a5 | 2036 | if (!nr_added_bufs) { |
22a29eac AS |
2037 | dev_err(&vdev->dev, |
2038 | "Error allocating buffers for control queue\n"); | |
2039 | err = -ENOMEM; | |
2040 | goto free_vqs; | |
2041 | } | |
1d05160b AS |
2042 | } else { |
2043 | /* | |
2044 | * For backward compatibility: Create a console port | |
2045 | * if we're running on older host. | |
2046 | */ | |
2047 | add_port(portdev, 0); | |
17634ba2 AS |
2048 | } |
2049 | ||
6bdf2afd AS |
2050 | spin_lock_irq(&pdrvdata_lock); |
2051 | list_add_tail(&portdev->list, &pdrvdata.portdevs); | |
2052 | spin_unlock_irq(&pdrvdata_lock); | |
2053 | ||
f909f850 AS |
2054 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
2055 | VIRTIO_CONSOLE_DEVICE_READY, 1); | |
5e38483b CB |
2056 | |
2057 | /* | |
2058 | * If there was an early virtio console, assume that there are no | |
2059 | * other consoles. We need to wait until the hvc_alloc matches the | |
2060 | * hvc_instantiate, otherwise tty_open will complain, resulting in | |
2061 | * a "Warning: unable to open an initial console" boot failure. | |
2062 | * Without multiport this is done in add_port above. With multiport | |
2063 | * this might take some host<->guest communication - thus we have to | |
2064 | * wait. | |
2065 | */ | |
2066 | if (multiport && early) | |
2067 | wait_for_completion(&early_console_added); | |
2068 | ||
31610434 RR |
2069 | return 0; |
2070 | ||
22a29eac | 2071 | free_vqs: |
0643e4c6 JL |
2072 | /* The host might want to notify mgmt sw about device add failure */ |
2073 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, | |
2074 | VIRTIO_CONSOLE_DEVICE_READY, 0); | |
a0e2dbfc | 2075 | remove_vqs(portdev); |
fb08bd27 AS |
2076 | free_chrdev: |
2077 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 2078 | free: |
1c85bf35 | 2079 | kfree(portdev); |
31610434 RR |
2080 | fail: |
2081 | return err; | |
2082 | } | |
2083 | ||
7177876f AS |
2084 | static void virtcons_remove(struct virtio_device *vdev) |
2085 | { | |
2086 | struct ports_device *portdev; | |
2087 | struct port *port, *port2; | |
7177876f AS |
2088 | |
2089 | portdev = vdev->priv; | |
2090 | ||
6bdf2afd AS |
2091 | spin_lock_irq(&pdrvdata_lock); |
2092 | list_del(&portdev->list); | |
2093 | spin_unlock_irq(&pdrvdata_lock); | |
2094 | ||
02238959 AS |
2095 | /* Disable interrupts for vqs */ |
2096 | vdev->config->reset(vdev); | |
2097 | /* Finish up work that's lined up */ | |
aded024a SB |
2098 | if (use_multiport(portdev)) |
2099 | cancel_work_sync(&portdev->control_work); | |
7177876f AS |
2100 | |
2101 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
b353a6b8 | 2102 | unplug_port(port); |
7177876f AS |
2103 | |
2104 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
2105 | ||
e062013c AS |
2106 | /* |
2107 | * When yanking out a device, we immediately lose the | |
2108 | * (device-side) queues. So there's no point in keeping the | |
2109 | * guest side around till we drop our final reference. This | |
2110 | * also means that any ports which are in an open state will | |
2111 | * have to just stop using the port, as the vqs are going | |
2112 | * away. | |
2113 | */ | |
a0e2dbfc AS |
2114 | remove_controlq_data(portdev); |
2115 | remove_vqs(portdev); | |
7177876f AS |
2116 | kfree(portdev); |
2117 | } | |
2118 | ||
31610434 RR |
2119 | static struct virtio_device_id id_table[] = { |
2120 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
2121 | { 0 }, | |
2122 | }; | |
2123 | ||
c2983458 CB |
2124 | static unsigned int features[] = { |
2125 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 2126 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
2127 | }; |
2128 | ||
1b637046 SB |
2129 | static struct virtio_device_id rproc_serial_id_table[] = { |
2130 | #if IS_ENABLED(CONFIG_REMOTEPROC) | |
2131 | { VIRTIO_ID_RPROC_SERIAL, VIRTIO_DEV_ANY_ID }, | |
2132 | #endif | |
2133 | { 0 }, | |
2134 | }; | |
2135 | ||
2136 | static unsigned int rproc_serial_features[] = { | |
2137 | }; | |
2138 | ||
89107000 | 2139 | #ifdef CONFIG_PM_SLEEP |
2b8f41d8 AS |
2140 | static int virtcons_freeze(struct virtio_device *vdev) |
2141 | { | |
2142 | struct ports_device *portdev; | |
2143 | struct port *port; | |
2144 | ||
2145 | portdev = vdev->priv; | |
2146 | ||
2147 | vdev->config->reset(vdev); | |
2148 | ||
c743d09d | 2149 | virtqueue_disable_cb(portdev->c_ivq); |
2b8f41d8 | 2150 | cancel_work_sync(&portdev->control_work); |
c743d09d AS |
2151 | /* |
2152 | * Once more: if control_work_handler() was running, it would | |
2153 | * enable the cb as the last step. | |
2154 | */ | |
2155 | virtqueue_disable_cb(portdev->c_ivq); | |
2b8f41d8 AS |
2156 | remove_controlq_data(portdev); |
2157 | ||
2158 | list_for_each_entry(port, &portdev->ports, list) { | |
c743d09d AS |
2159 | virtqueue_disable_cb(port->in_vq); |
2160 | virtqueue_disable_cb(port->out_vq); | |
2b8f41d8 AS |
2161 | /* |
2162 | * We'll ask the host later if the new invocation has | |
2163 | * the port opened or closed. | |
2164 | */ | |
2165 | port->host_connected = false; | |
2166 | remove_port_data(port); | |
2167 | } | |
2168 | remove_vqs(portdev); | |
2169 | ||
2170 | return 0; | |
2171 | } | |
2172 | ||
2173 | static int virtcons_restore(struct virtio_device *vdev) | |
2174 | { | |
2175 | struct ports_device *portdev; | |
2176 | struct port *port; | |
2177 | int ret; | |
2178 | ||
2179 | portdev = vdev->priv; | |
2180 | ||
2181 | ret = init_vqs(portdev); | |
2182 | if (ret) | |
2183 | return ret; | |
2184 | ||
2185 | if (use_multiport(portdev)) | |
165b1b8b | 2186 | fill_queue(portdev->c_ivq, &portdev->c_ivq_lock); |
2b8f41d8 AS |
2187 | |
2188 | list_for_each_entry(port, &portdev->ports, list) { | |
2189 | port->in_vq = portdev->in_vqs[port->id]; | |
2190 | port->out_vq = portdev->out_vqs[port->id]; | |
2191 | ||
2192 | fill_queue(port->in_vq, &port->inbuf_lock); | |
2193 | ||
2194 | /* Get port open/close status on the host */ | |
2195 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
fa8b66cc AS |
2196 | |
2197 | /* | |
2198 | * If a port was open at the time of suspending, we | |
2199 | * have to let the host know that it's still open. | |
2200 | */ | |
2201 | if (port->guest_connected) | |
2202 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
2b8f41d8 AS |
2203 | } |
2204 | return 0; | |
2205 | } | |
2206 | #endif | |
2207 | ||
31610434 | 2208 | static struct virtio_driver virtio_console = { |
c2983458 CB |
2209 | .feature_table = features, |
2210 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
2211 | .driver.name = KBUILD_MODNAME, |
2212 | .driver.owner = THIS_MODULE, | |
2213 | .id_table = id_table, | |
2214 | .probe = virtcons_probe, | |
7177876f | 2215 | .remove = virtcons_remove, |
7f5d810d | 2216 | .config_changed = config_intr, |
89107000 | 2217 | #ifdef CONFIG_PM_SLEEP |
2b8f41d8 AS |
2218 | .freeze = virtcons_freeze, |
2219 | .restore = virtcons_restore, | |
2220 | #endif | |
31610434 RR |
2221 | }; |
2222 | ||
bcd2982a | 2223 | static struct virtio_driver virtio_rproc_serial = { |
1b637046 SB |
2224 | .feature_table = rproc_serial_features, |
2225 | .feature_table_size = ARRAY_SIZE(rproc_serial_features), | |
2226 | .driver.name = "virtio_rproc_serial", | |
2227 | .driver.owner = THIS_MODULE, | |
2228 | .id_table = rproc_serial_id_table, | |
2229 | .probe = virtcons_probe, | |
2230 | .remove = virtcons_remove, | |
2231 | }; | |
2232 | ||
31610434 RR |
2233 | static int __init init(void) |
2234 | { | |
fb08bd27 AS |
2235 | int err; |
2236 | ||
2237 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
2238 | if (IS_ERR(pdrvdata.class)) { | |
2239 | err = PTR_ERR(pdrvdata.class); | |
2240 | pr_err("Error %d creating virtio-ports class\n", err); | |
2241 | return err; | |
2242 | } | |
d99393ef AS |
2243 | |
2244 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
3f0d0c9b DC |
2245 | if (!pdrvdata.debugfs_dir) |
2246 | pr_warning("Error creating debugfs dir for virtio-ports\n"); | |
38edf58d | 2247 | INIT_LIST_HEAD(&pdrvdata.consoles); |
6bdf2afd | 2248 | INIT_LIST_HEAD(&pdrvdata.portdevs); |
38edf58d | 2249 | |
33e1afc3 AK |
2250 | err = register_virtio_driver(&virtio_console); |
2251 | if (err < 0) { | |
2252 | pr_err("Error %d registering virtio driver\n", err); | |
2253 | goto free; | |
2254 | } | |
1b637046 SB |
2255 | err = register_virtio_driver(&virtio_rproc_serial); |
2256 | if (err < 0) { | |
2257 | pr_err("Error %d registering virtio rproc serial driver\n", | |
2258 | err); | |
2259 | goto unregister; | |
2260 | } | |
33e1afc3 | 2261 | return 0; |
1b637046 SB |
2262 | unregister: |
2263 | unregister_virtio_driver(&virtio_console); | |
33e1afc3 AK |
2264 | free: |
2265 | if (pdrvdata.debugfs_dir) | |
2266 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
2267 | class_destroy(pdrvdata.class); | |
2268 | return err; | |
31610434 | 2269 | } |
7177876f AS |
2270 | |
2271 | static void __exit fini(void) | |
2272 | { | |
1b637046 SB |
2273 | reclaim_dma_bufs(); |
2274 | ||
7177876f | 2275 | unregister_virtio_driver(&virtio_console); |
1b637046 | 2276 | unregister_virtio_driver(&virtio_rproc_serial); |
7177876f AS |
2277 | |
2278 | class_destroy(pdrvdata.class); | |
2279 | if (pdrvdata.debugfs_dir) | |
2280 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
2281 | } | |
31610434 | 2282 | module_init(init); |
7177876f | 2283 | module_exit(fini); |
31610434 RR |
2284 | |
2285 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2286 | MODULE_DESCRIPTION("Virtio console driver"); | |
2287 | MODULE_LICENSE("GPL"); |