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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 | ||
fb08bd27 AS |
64 | /* Number of devices this driver is handling */ |
65 | unsigned int index; | |
66 | ||
d8a02bd5 RR |
67 | /* |
68 | * This is used to keep track of the number of hvc consoles | |
69 | * spawned by this driver. This number is given as the first | |
70 | * argument to hvc_alloc(). To correctly map an initial | |
71 | * console spawned via hvc_instantiate to the console being | |
72 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
73 | * | |
74 | * We also just assume the first console being initialised was | |
75 | * the first one that got used as the initial console. | |
76 | */ | |
77 | unsigned int next_vtermno; | |
78 | ||
38edf58d AS |
79 | /* All the console devices handled by this driver */ |
80 | struct list_head consoles; | |
81 | }; | |
82 | static struct ports_driver_data pdrvdata; | |
83 | ||
84 | DEFINE_SPINLOCK(pdrvdata_lock); | |
5e38483b | 85 | DECLARE_COMPLETION(early_console_added); |
38edf58d | 86 | |
4f23c573 AS |
87 | /* This struct holds information that's relevant only for console ports */ |
88 | struct console { | |
89 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
90 | struct list_head list; | |
91 | ||
92 | /* The hvc device associated with this console port */ | |
93 | struct hvc_struct *hvc; | |
94 | ||
9778829c AS |
95 | /* The size of the console */ |
96 | struct winsize ws; | |
97 | ||
4f23c573 AS |
98 | /* |
99 | * This number identifies the number that we used to register | |
100 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
101 | * number passed on by the hvc callbacks to us to | |
102 | * differentiate between the other console ports handled by | |
103 | * this driver | |
104 | */ | |
105 | u32 vtermno; | |
106 | }; | |
107 | ||
fdb9a054 AS |
108 | struct port_buffer { |
109 | char *buf; | |
110 | ||
111 | /* size of the buffer in *buf above */ | |
112 | size_t size; | |
113 | ||
114 | /* used length of the buffer */ | |
115 | size_t len; | |
116 | /* offset in the buf from which to consume data */ | |
117 | size_t offset; | |
276a3e95 | 118 | |
1b637046 SB |
119 | /* DMA address of buffer */ |
120 | dma_addr_t dma; | |
121 | ||
122 | /* Device we got DMA memory from */ | |
123 | struct device *dev; | |
124 | ||
125 | /* List of pending dma buffers to free */ | |
126 | struct list_head list; | |
127 | ||
276a3e95 SB |
128 | /* If sgpages == 0 then buf is used */ |
129 | unsigned int sgpages; | |
130 | ||
131 | /* sg is used if spages > 0. sg must be the last in is struct */ | |
132 | struct scatterlist sg[0]; | |
fdb9a054 AS |
133 | }; |
134 | ||
17634ba2 AS |
135 | /* |
136 | * This is a per-device struct that stores data common to all the | |
137 | * ports for that device (vdev->priv). | |
138 | */ | |
139 | struct ports_device { | |
6bdf2afd AS |
140 | /* Next portdev in the list, head is in the pdrvdata struct */ |
141 | struct list_head list; | |
142 | ||
17634ba2 AS |
143 | /* |
144 | * Workqueue handlers where we process deferred work after | |
145 | * notification | |
146 | */ | |
147 | struct work_struct control_work; | |
148 | ||
149 | struct list_head ports; | |
150 | ||
151 | /* To protect the list of ports */ | |
152 | spinlock_t ports_lock; | |
153 | ||
154 | /* To protect the vq operations for the control channel */ | |
155 | spinlock_t cvq_lock; | |
156 | ||
157 | /* The current config space is stored here */ | |
b99fa815 | 158 | struct virtio_console_config config; |
17634ba2 AS |
159 | |
160 | /* The virtio device we're associated with */ | |
161 | struct virtio_device *vdev; | |
162 | ||
163 | /* | |
164 | * A couple of virtqueues for the control channel: one for | |
165 | * guest->host transfers, one for host->guest transfers | |
166 | */ | |
167 | struct virtqueue *c_ivq, *c_ovq; | |
168 | ||
169 | /* Array of per-port IO virtqueues */ | |
170 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 AS |
171 | |
172 | /* Used for numbering devices for sysfs and debugfs */ | |
173 | unsigned int drv_index; | |
174 | ||
175 | /* Major number for this device. Ports will be created as minors. */ | |
176 | int chr_major; | |
17634ba2 AS |
177 | }; |
178 | ||
17e5b4f2 AS |
179 | struct port_stats { |
180 | unsigned long bytes_sent, bytes_received, bytes_discarded; | |
181 | }; | |
182 | ||
1c85bf35 | 183 | /* This struct holds the per-port data */ |
21206ede | 184 | struct port { |
17634ba2 AS |
185 | /* Next port in the list, head is in the ports_device */ |
186 | struct list_head list; | |
187 | ||
1c85bf35 AS |
188 | /* Pointer to the parent virtio_console device */ |
189 | struct ports_device *portdev; | |
fdb9a054 AS |
190 | |
191 | /* The current buffer from which data has to be fed to readers */ | |
192 | struct port_buffer *inbuf; | |
21206ede | 193 | |
203baab8 AS |
194 | /* |
195 | * To protect the operations on the in_vq associated with this | |
196 | * port. Has to be a spinlock because it can be called from | |
197 | * interrupt context (get_char()). | |
198 | */ | |
199 | spinlock_t inbuf_lock; | |
200 | ||
cdfadfc1 AS |
201 | /* Protect the operations on the out_vq. */ |
202 | spinlock_t outvq_lock; | |
203 | ||
1c85bf35 AS |
204 | /* The IO vqs for this port */ |
205 | struct virtqueue *in_vq, *out_vq; | |
206 | ||
d99393ef AS |
207 | /* File in the debugfs directory that exposes this port's information */ |
208 | struct dentry *debugfs_file; | |
209 | ||
17e5b4f2 AS |
210 | /* |
211 | * Keep count of the bytes sent, received and discarded for | |
212 | * this port for accounting and debugging purposes. These | |
213 | * counts are not reset across port open / close events. | |
214 | */ | |
215 | struct port_stats stats; | |
216 | ||
4f23c573 AS |
217 | /* |
218 | * The entries in this struct will be valid if this port is | |
219 | * hooked up to an hvc console | |
220 | */ | |
221 | struct console cons; | |
17634ba2 | 222 | |
fb08bd27 | 223 | /* Each port associates with a separate char device */ |
d22a6989 | 224 | struct cdev *cdev; |
fb08bd27 AS |
225 | struct device *dev; |
226 | ||
b353a6b8 AS |
227 | /* Reference-counting to handle port hot-unplugs and file operations */ |
228 | struct kref kref; | |
229 | ||
2030fa49 AS |
230 | /* A waitqueue for poll() or blocking read operations */ |
231 | wait_queue_head_t waitqueue; | |
232 | ||
431edb8a AS |
233 | /* The 'name' of the port that we expose via sysfs properties */ |
234 | char *name; | |
235 | ||
3eae0ade AS |
236 | /* We can notify apps of host connect / disconnect events via SIGIO */ |
237 | struct fasync_struct *async_queue; | |
238 | ||
17634ba2 AS |
239 | /* The 'id' to identify the port with the Host */ |
240 | u32 id; | |
2030fa49 | 241 | |
cdfadfc1 AS |
242 | bool outvq_full; |
243 | ||
2030fa49 AS |
244 | /* Is the host device open */ |
245 | bool host_connected; | |
3c7969cc AS |
246 | |
247 | /* We should allow only one process to open a port */ | |
248 | bool guest_connected; | |
21206ede | 249 | }; |
31610434 | 250 | |
971f3390 RR |
251 | /* This is the very early arch-specified put chars function. */ |
252 | static int (*early_put_chars)(u32, const char *, int); | |
253 | ||
38edf58d AS |
254 | static struct port *find_port_by_vtermno(u32 vtermno) |
255 | { | |
256 | struct port *port; | |
4f23c573 | 257 | struct console *cons; |
38edf58d AS |
258 | unsigned long flags; |
259 | ||
260 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
261 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
262 | if (cons->vtermno == vtermno) { | |
263 | port = container_of(cons, struct port, cons); | |
38edf58d | 264 | goto out; |
4f23c573 | 265 | } |
38edf58d AS |
266 | } |
267 | port = NULL; | |
268 | out: | |
269 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
270 | return port; | |
271 | } | |
272 | ||
04950cdf AS |
273 | static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, |
274 | dev_t dev) | |
275 | { | |
276 | struct port *port; | |
277 | unsigned long flags; | |
278 | ||
279 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
280 | list_for_each_entry(port, &portdev->ports, list) | |
d22a6989 | 281 | if (port->cdev->dev == dev) |
04950cdf AS |
282 | goto out; |
283 | port = NULL; | |
284 | out: | |
285 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
286 | ||
287 | return port; | |
288 | } | |
289 | ||
290 | static struct port *find_port_by_devt(dev_t dev) | |
291 | { | |
292 | struct ports_device *portdev; | |
293 | struct port *port; | |
294 | unsigned long flags; | |
295 | ||
296 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
297 | list_for_each_entry(portdev, &pdrvdata.portdevs, list) { | |
298 | port = find_port_by_devt_in_portdev(portdev, dev); | |
299 | if (port) | |
300 | goto out; | |
301 | } | |
302 | port = NULL; | |
303 | out: | |
304 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
305 | return port; | |
306 | } | |
307 | ||
17634ba2 AS |
308 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
309 | { | |
310 | struct port *port; | |
311 | unsigned long flags; | |
312 | ||
313 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
314 | list_for_each_entry(port, &portdev->ports, list) | |
315 | if (port->id == id) | |
316 | goto out; | |
317 | port = NULL; | |
318 | out: | |
319 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
320 | ||
321 | return port; | |
322 | } | |
323 | ||
203baab8 AS |
324 | static struct port *find_port_by_vq(struct ports_device *portdev, |
325 | struct virtqueue *vq) | |
326 | { | |
327 | struct port *port; | |
203baab8 AS |
328 | unsigned long flags; |
329 | ||
17634ba2 AS |
330 | spin_lock_irqsave(&portdev->ports_lock, flags); |
331 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
332 | if (port->in_vq == vq || port->out_vq == vq) |
333 | goto out; | |
203baab8 AS |
334 | port = NULL; |
335 | out: | |
17634ba2 | 336 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
337 | return port; |
338 | } | |
339 | ||
17634ba2 AS |
340 | static bool is_console_port(struct port *port) |
341 | { | |
342 | if (port->cons.hvc) | |
343 | return true; | |
344 | return false; | |
345 | } | |
346 | ||
1b637046 SB |
347 | static bool is_rproc_serial(const struct virtio_device *vdev) |
348 | { | |
349 | return is_rproc_enabled && vdev->id.device == VIRTIO_ID_RPROC_SERIAL; | |
350 | } | |
351 | ||
17634ba2 AS |
352 | static inline bool use_multiport(struct ports_device *portdev) |
353 | { | |
354 | /* | |
355 | * This condition can be true when put_chars is called from | |
356 | * early_init | |
357 | */ | |
358 | if (!portdev->vdev) | |
359 | return 0; | |
360 | return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); | |
361 | } | |
362 | ||
1b637046 SB |
363 | static DEFINE_SPINLOCK(dma_bufs_lock); |
364 | static LIST_HEAD(pending_free_dma_bufs); | |
365 | ||
366 | static void free_buf(struct port_buffer *buf, bool can_sleep) | |
fdb9a054 | 367 | { |
276a3e95 SB |
368 | unsigned int i; |
369 | ||
276a3e95 SB |
370 | for (i = 0; i < buf->sgpages; i++) { |
371 | struct page *page = sg_page(&buf->sg[i]); | |
372 | if (!page) | |
373 | break; | |
374 | put_page(page); | |
375 | } | |
376 | ||
1b637046 SB |
377 | if (!buf->dev) { |
378 | kfree(buf->buf); | |
379 | } else if (is_rproc_enabled) { | |
380 | unsigned long flags; | |
381 | ||
382 | /* dma_free_coherent requires interrupts to be enabled. */ | |
383 | if (!can_sleep) { | |
384 | /* queue up dma-buffers to be freed later */ | |
385 | spin_lock_irqsave(&dma_bufs_lock, flags); | |
386 | list_add_tail(&buf->list, &pending_free_dma_bufs); | |
387 | spin_unlock_irqrestore(&dma_bufs_lock, flags); | |
388 | return; | |
389 | } | |
390 | dma_free_coherent(buf->dev, buf->size, buf->buf, buf->dma); | |
391 | ||
392 | /* Release device refcnt and allow it to be freed */ | |
393 | put_device(buf->dev); | |
394 | } | |
395 | ||
fdb9a054 AS |
396 | kfree(buf); |
397 | } | |
398 | ||
1b637046 SB |
399 | static void reclaim_dma_bufs(void) |
400 | { | |
401 | unsigned long flags; | |
402 | struct port_buffer *buf, *tmp; | |
403 | LIST_HEAD(tmp_list); | |
404 | ||
405 | if (list_empty(&pending_free_dma_bufs)) | |
406 | return; | |
407 | ||
408 | /* Create a copy of the pending_free_dma_bufs while holding the lock */ | |
409 | spin_lock_irqsave(&dma_bufs_lock, flags); | |
410 | list_cut_position(&tmp_list, &pending_free_dma_bufs, | |
411 | pending_free_dma_bufs.prev); | |
412 | spin_unlock_irqrestore(&dma_bufs_lock, flags); | |
413 | ||
414 | /* Release the dma buffers, without irqs enabled */ | |
415 | list_for_each_entry_safe(buf, tmp, &tmp_list, list) { | |
416 | list_del(&buf->list); | |
417 | free_buf(buf, true); | |
418 | } | |
419 | } | |
420 | ||
276a3e95 SB |
421 | static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size, |
422 | int pages) | |
fdb9a054 AS |
423 | { |
424 | struct port_buffer *buf; | |
425 | ||
1b637046 SB |
426 | reclaim_dma_bufs(); |
427 | ||
276a3e95 SB |
428 | /* |
429 | * Allocate buffer and the sg list. The sg list array is allocated | |
430 | * directly after the port_buffer struct. | |
431 | */ | |
432 | buf = kmalloc(sizeof(*buf) + sizeof(struct scatterlist) * pages, | |
433 | GFP_KERNEL); | |
fdb9a054 AS |
434 | if (!buf) |
435 | goto fail; | |
276a3e95 SB |
436 | |
437 | buf->sgpages = pages; | |
438 | if (pages > 0) { | |
1b637046 | 439 | buf->dev = NULL; |
276a3e95 SB |
440 | buf->buf = NULL; |
441 | return buf; | |
442 | } | |
443 | ||
1b637046 SB |
444 | if (is_rproc_serial(vq->vdev)) { |
445 | /* | |
446 | * Allocate DMA memory from ancestor. When a virtio | |
447 | * device is created by remoteproc, the DMA memory is | |
448 | * associated with the grandparent device: | |
449 | * vdev => rproc => platform-dev. | |
450 | * The code here would have been less quirky if | |
451 | * DMA_MEMORY_INCLUDES_CHILDREN had been supported | |
452 | * in dma-coherent.c | |
453 | */ | |
454 | if (!vq->vdev->dev.parent || !vq->vdev->dev.parent->parent) | |
455 | goto free_buf; | |
456 | buf->dev = vq->vdev->dev.parent->parent; | |
457 | ||
458 | /* Increase device refcnt to avoid freeing it */ | |
459 | get_device(buf->dev); | |
460 | buf->buf = dma_alloc_coherent(buf->dev, buf_size, &buf->dma, | |
461 | GFP_KERNEL); | |
462 | } else { | |
463 | buf->dev = NULL; | |
464 | buf->buf = kmalloc(buf_size, GFP_KERNEL); | |
465 | } | |
466 | ||
fdb9a054 AS |
467 | if (!buf->buf) |
468 | goto free_buf; | |
469 | buf->len = 0; | |
470 | buf->offset = 0; | |
471 | buf->size = buf_size; | |
472 | return buf; | |
473 | ||
474 | free_buf: | |
475 | kfree(buf); | |
476 | fail: | |
477 | return NULL; | |
478 | } | |
479 | ||
a3cde449 | 480 | /* Callers should take appropriate locks */ |
defde669 | 481 | static struct port_buffer *get_inbuf(struct port *port) |
a3cde449 AS |
482 | { |
483 | struct port_buffer *buf; | |
a3cde449 AS |
484 | unsigned int len; |
485 | ||
d25a9dda AS |
486 | if (port->inbuf) |
487 | return port->inbuf; | |
488 | ||
489 | buf = virtqueue_get_buf(port->in_vq, &len); | |
a3cde449 AS |
490 | if (buf) { |
491 | buf->len = len; | |
492 | buf->offset = 0; | |
17e5b4f2 | 493 | port->stats.bytes_received += len; |
a3cde449 AS |
494 | } |
495 | return buf; | |
496 | } | |
497 | ||
e27b5198 AS |
498 | /* |
499 | * Create a scatter-gather list representing our input buffer and put | |
500 | * it in the queue. | |
501 | * | |
502 | * Callers should take appropriate locks. | |
503 | */ | |
203baab8 | 504 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
505 | { |
506 | struct scatterlist sg[1]; | |
203baab8 | 507 | int ret; |
1c85bf35 | 508 | |
e27b5198 AS |
509 | sg_init_one(sg, buf->buf, buf->size); |
510 | ||
f96fde41 | 511 | ret = virtqueue_add_buf(vq, sg, 0, 1, buf, GFP_ATOMIC); |
505b0451 | 512 | virtqueue_kick(vq); |
49e86f16 AS |
513 | if (!ret) |
514 | ret = vq->num_free; | |
203baab8 AS |
515 | return ret; |
516 | } | |
517 | ||
88f251ac AS |
518 | /* Discard any unread data this port has. Callers lockers. */ |
519 | static void discard_port_data(struct port *port) | |
520 | { | |
521 | struct port_buffer *buf; | |
2d24cdaa | 522 | unsigned int err; |
88f251ac | 523 | |
d7a62cd0 AS |
524 | if (!port->portdev) { |
525 | /* Device has been unplugged. vqs are already gone. */ | |
526 | return; | |
527 | } | |
2d24cdaa | 528 | buf = get_inbuf(port); |
88f251ac | 529 | |
ce072a0c | 530 | err = 0; |
d6933561 | 531 | while (buf) { |
17e5b4f2 | 532 | port->stats.bytes_discarded += buf->len - buf->offset; |
2d24cdaa | 533 | if (add_inbuf(port->in_vq, buf) < 0) { |
ce072a0c | 534 | err++; |
1b637046 | 535 | free_buf(buf, false); |
d6933561 | 536 | } |
2d24cdaa AS |
537 | port->inbuf = NULL; |
538 | buf = get_inbuf(port); | |
88f251ac | 539 | } |
ce072a0c | 540 | if (err) |
d6933561 | 541 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", |
ce072a0c | 542 | err); |
88f251ac AS |
543 | } |
544 | ||
203baab8 AS |
545 | static bool port_has_data(struct port *port) |
546 | { | |
547 | unsigned long flags; | |
548 | bool ret; | |
549 | ||
d25a9dda | 550 | ret = false; |
203baab8 | 551 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 552 | port->inbuf = get_inbuf(port); |
d25a9dda | 553 | if (port->inbuf) |
d6933561 | 554 | ret = true; |
d25a9dda | 555 | |
203baab8 | 556 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
557 | return ret; |
558 | } | |
559 | ||
3425e706 AS |
560 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
561 | unsigned int event, unsigned int value) | |
17634ba2 AS |
562 | { |
563 | struct scatterlist sg[1]; | |
564 | struct virtio_console_control cpkt; | |
565 | struct virtqueue *vq; | |
604b2ad7 | 566 | unsigned int len; |
17634ba2 | 567 | |
3425e706 | 568 | if (!use_multiport(portdev)) |
17634ba2 AS |
569 | return 0; |
570 | ||
3425e706 | 571 | cpkt.id = port_id; |
17634ba2 AS |
572 | cpkt.event = event; |
573 | cpkt.value = value; | |
574 | ||
3425e706 | 575 | vq = portdev->c_ovq; |
17634ba2 AS |
576 | |
577 | sg_init_one(sg, &cpkt, sizeof(cpkt)); | |
589575a2 | 578 | if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt, GFP_ATOMIC) == 0) { |
505b0451 MT |
579 | virtqueue_kick(vq); |
580 | while (!virtqueue_get_buf(vq, &len)) | |
17634ba2 AS |
581 | cpu_relax(); |
582 | } | |
583 | return 0; | |
584 | } | |
585 | ||
3425e706 AS |
586 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
587 | unsigned int value) | |
588 | { | |
84ec06c5 AS |
589 | /* Did the port get unplugged before userspace closed it? */ |
590 | if (port->portdev) | |
591 | return __send_control_msg(port->portdev, port->id, event, value); | |
592 | return 0; | |
3425e706 AS |
593 | } |
594 | ||
eb5e89fc | 595 | |
cdfadfc1 AS |
596 | /* Callers must take the port->outvq_lock */ |
597 | static void reclaim_consumed_buffers(struct port *port) | |
598 | { | |
276a3e95 | 599 | struct port_buffer *buf; |
cdfadfc1 AS |
600 | unsigned int len; |
601 | ||
d7a62cd0 AS |
602 | if (!port->portdev) { |
603 | /* Device has been unplugged. vqs are already gone. */ | |
604 | return; | |
605 | } | |
276a3e95 | 606 | while ((buf = virtqueue_get_buf(port->out_vq, &len))) { |
1b637046 | 607 | free_buf(buf, false); |
cdfadfc1 AS |
608 | port->outvq_full = false; |
609 | } | |
610 | } | |
611 | ||
eb5e89fc MH |
612 | static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, |
613 | int nents, size_t in_count, | |
276a3e95 | 614 | void *data, bool nonblock) |
f997f00b | 615 | { |
f997f00b | 616 | struct virtqueue *out_vq; |
589575a2 | 617 | int err; |
cdfadfc1 | 618 | unsigned long flags; |
f997f00b AS |
619 | unsigned int len; |
620 | ||
621 | out_vq = port->out_vq; | |
622 | ||
cdfadfc1 AS |
623 | spin_lock_irqsave(&port->outvq_lock, flags); |
624 | ||
625 | reclaim_consumed_buffers(port); | |
626 | ||
276a3e95 | 627 | err = virtqueue_add_buf(out_vq, sg, nents, 0, data, GFP_ATOMIC); |
f997f00b AS |
628 | |
629 | /* Tell Host to go! */ | |
505b0451 | 630 | virtqueue_kick(out_vq); |
f997f00b | 631 | |
589575a2 | 632 | if (err) { |
9ff4cfab | 633 | in_count = 0; |
cdfadfc1 | 634 | goto done; |
f997f00b AS |
635 | } |
636 | ||
589575a2 | 637 | if (out_vq->num_free == 0) |
cdfadfc1 AS |
638 | port->outvq_full = true; |
639 | ||
640 | if (nonblock) | |
641 | goto done; | |
642 | ||
643 | /* | |
644 | * Wait till the host acknowledges it pushed out the data we | |
531295e6 AS |
645 | * sent. This is done for data from the hvc_console; the tty |
646 | * operations are performed with spinlocks held so we can't | |
647 | * sleep here. An alternative would be to copy the data to a | |
648 | * buffer and relax the spinning requirement. The downside is | |
649 | * we need to kmalloc a GFP_ATOMIC buffer each time the | |
650 | * console driver writes something out. | |
cdfadfc1 | 651 | */ |
505b0451 | 652 | while (!virtqueue_get_buf(out_vq, &len)) |
f997f00b | 653 | cpu_relax(); |
cdfadfc1 AS |
654 | done: |
655 | spin_unlock_irqrestore(&port->outvq_lock, flags); | |
17e5b4f2 AS |
656 | |
657 | port->stats.bytes_sent += in_count; | |
cdfadfc1 AS |
658 | /* |
659 | * We're expected to return the amount of data we wrote -- all | |
660 | * of it | |
661 | */ | |
9ff4cfab | 662 | return in_count; |
f997f00b AS |
663 | } |
664 | ||
203baab8 AS |
665 | /* |
666 | * Give out the data that's requested from the buffer that we have | |
667 | * queued up. | |
668 | */ | |
b766ceed AS |
669 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
670 | bool to_user) | |
203baab8 AS |
671 | { |
672 | struct port_buffer *buf; | |
673 | unsigned long flags; | |
674 | ||
675 | if (!out_count || !port_has_data(port)) | |
676 | return 0; | |
677 | ||
678 | buf = port->inbuf; | |
b766ceed | 679 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 680 | |
b766ceed AS |
681 | if (to_user) { |
682 | ssize_t ret; | |
683 | ||
684 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
685 | if (ret) | |
686 | return -EFAULT; | |
687 | } else { | |
688 | memcpy(out_buf, buf->buf + buf->offset, out_count); | |
689 | } | |
203baab8 | 690 | |
203baab8 AS |
691 | buf->offset += out_count; |
692 | ||
693 | if (buf->offset == buf->len) { | |
694 | /* | |
695 | * We're done using all the data in this buffer. | |
696 | * Re-queue so that the Host can send us more data. | |
697 | */ | |
698 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
699 | port->inbuf = NULL; | |
700 | ||
701 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 702 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
703 | |
704 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
705 | } | |
b766ceed | 706 | /* Return the number of bytes actually copied */ |
203baab8 | 707 | return out_count; |
e27b5198 AS |
708 | } |
709 | ||
2030fa49 | 710 | /* The condition that must be true for polling to end */ |
60caacd3 | 711 | static bool will_read_block(struct port *port) |
2030fa49 | 712 | { |
3709ea7a AS |
713 | if (!port->guest_connected) { |
714 | /* Port got hot-unplugged. Let's exit. */ | |
715 | return false; | |
716 | } | |
60caacd3 | 717 | return !port_has_data(port) && port->host_connected; |
2030fa49 AS |
718 | } |
719 | ||
cdfadfc1 AS |
720 | static bool will_write_block(struct port *port) |
721 | { | |
722 | bool ret; | |
723 | ||
60e5e0b8 AS |
724 | if (!port->guest_connected) { |
725 | /* Port got hot-unplugged. Let's exit. */ | |
726 | return false; | |
727 | } | |
cdfadfc1 AS |
728 | if (!port->host_connected) |
729 | return true; | |
730 | ||
731 | spin_lock_irq(&port->outvq_lock); | |
732 | /* | |
733 | * Check if the Host has consumed any buffers since we last | |
734 | * sent data (this is only applicable for nonblocking ports). | |
735 | */ | |
736 | reclaim_consumed_buffers(port); | |
737 | ret = port->outvq_full; | |
738 | spin_unlock_irq(&port->outvq_lock); | |
739 | ||
740 | return ret; | |
741 | } | |
742 | ||
2030fa49 AS |
743 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, |
744 | size_t count, loff_t *offp) | |
745 | { | |
746 | struct port *port; | |
747 | ssize_t ret; | |
748 | ||
749 | port = filp->private_data; | |
750 | ||
751 | if (!port_has_data(port)) { | |
752 | /* | |
753 | * If nothing's connected on the host just return 0 in | |
754 | * case of list_empty; this tells the userspace app | |
755 | * that there's no connection | |
756 | */ | |
757 | if (!port->host_connected) | |
758 | return 0; | |
759 | if (filp->f_flags & O_NONBLOCK) | |
760 | return -EAGAIN; | |
761 | ||
a08fa92d AS |
762 | ret = wait_event_freezable(port->waitqueue, |
763 | !will_read_block(port)); | |
2030fa49 AS |
764 | if (ret < 0) |
765 | return ret; | |
766 | } | |
b3dddb9e AS |
767 | /* Port got hot-unplugged. */ |
768 | if (!port->guest_connected) | |
769 | return -ENODEV; | |
2030fa49 AS |
770 | /* |
771 | * We could've received a disconnection message while we were | |
772 | * waiting for more data. | |
773 | * | |
774 | * This check is not clubbed in the if() statement above as we | |
775 | * might receive some data as well as the host could get | |
776 | * disconnected after we got woken up from our wait. So we | |
777 | * really want to give off whatever data we have and only then | |
778 | * check for host_connected. | |
779 | */ | |
780 | if (!port_has_data(port) && !port->host_connected) | |
781 | return 0; | |
782 | ||
783 | return fill_readbuf(port, ubuf, count, true); | |
784 | } | |
785 | ||
efe75d24 MH |
786 | static int wait_port_writable(struct port *port, bool nonblock) |
787 | { | |
788 | int ret; | |
789 | ||
790 | if (will_write_block(port)) { | |
791 | if (nonblock) | |
792 | return -EAGAIN; | |
793 | ||
794 | ret = wait_event_freezable(port->waitqueue, | |
795 | !will_write_block(port)); | |
796 | if (ret < 0) | |
797 | return ret; | |
798 | } | |
799 | /* Port got hot-unplugged. */ | |
800 | if (!port->guest_connected) | |
801 | return -ENODEV; | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
2030fa49 AS |
806 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, |
807 | size_t count, loff_t *offp) | |
808 | { | |
809 | struct port *port; | |
276a3e95 | 810 | struct port_buffer *buf; |
2030fa49 | 811 | ssize_t ret; |
cdfadfc1 | 812 | bool nonblock; |
276a3e95 | 813 | struct scatterlist sg[1]; |
2030fa49 | 814 | |
65745422 AS |
815 | /* Userspace could be out to fool us */ |
816 | if (!count) | |
817 | return 0; | |
818 | ||
2030fa49 AS |
819 | port = filp->private_data; |
820 | ||
cdfadfc1 AS |
821 | nonblock = filp->f_flags & O_NONBLOCK; |
822 | ||
efe75d24 MH |
823 | ret = wait_port_writable(port, nonblock); |
824 | if (ret < 0) | |
825 | return ret; | |
cdfadfc1 | 826 | |
2030fa49 AS |
827 | count = min((size_t)(32 * 1024), count); |
828 | ||
276a3e95 | 829 | buf = alloc_buf(port->out_vq, count, 0); |
2030fa49 AS |
830 | if (!buf) |
831 | return -ENOMEM; | |
832 | ||
276a3e95 | 833 | ret = copy_from_user(buf->buf, ubuf, count); |
2030fa49 AS |
834 | if (ret) { |
835 | ret = -EFAULT; | |
836 | goto free_buf; | |
837 | } | |
838 | ||
531295e6 AS |
839 | /* |
840 | * We now ask send_buf() to not spin for generic ports -- we | |
841 | * can re-use the same code path that non-blocking file | |
842 | * descriptors take for blocking file descriptors since the | |
843 | * wait is already done and we're certain the write will go | |
844 | * through to the host. | |
845 | */ | |
846 | nonblock = true; | |
276a3e95 SB |
847 | sg_init_one(sg, buf->buf, count); |
848 | ret = __send_to_port(port, sg, 1, count, buf, nonblock); | |
cdfadfc1 AS |
849 | |
850 | if (nonblock && ret > 0) | |
851 | goto out; | |
852 | ||
2030fa49 | 853 | free_buf: |
1b637046 | 854 | free_buf(buf, true); |
cdfadfc1 | 855 | out: |
2030fa49 AS |
856 | return ret; |
857 | } | |
858 | ||
eb5e89fc MH |
859 | struct sg_list { |
860 | unsigned int n; | |
8ca84a50 | 861 | unsigned int size; |
eb5e89fc MH |
862 | size_t len; |
863 | struct scatterlist *sg; | |
864 | }; | |
865 | ||
866 | static int pipe_to_sg(struct pipe_inode_info *pipe, struct pipe_buffer *buf, | |
867 | struct splice_desc *sd) | |
868 | { | |
869 | struct sg_list *sgl = sd->u.data; | |
ec8fc870 | 870 | unsigned int offset, len; |
eb5e89fc | 871 | |
8ca84a50 | 872 | if (sgl->n == sgl->size) |
eb5e89fc MH |
873 | return 0; |
874 | ||
875 | /* Try lock this page */ | |
876 | if (buf->ops->steal(pipe, buf) == 0) { | |
877 | /* Get reference and unlock page for moving */ | |
878 | get_page(buf->page); | |
879 | unlock_page(buf->page); | |
880 | ||
881 | len = min(buf->len, sd->len); | |
882 | sg_set_page(&(sgl->sg[sgl->n]), buf->page, len, buf->offset); | |
ec8fc870 MH |
883 | } else { |
884 | /* Failback to copying a page */ | |
885 | struct page *page = alloc_page(GFP_KERNEL); | |
886 | char *src = buf->ops->map(pipe, buf, 1); | |
887 | char *dst; | |
888 | ||
889 | if (!page) | |
890 | return -ENOMEM; | |
891 | dst = kmap(page); | |
892 | ||
893 | offset = sd->pos & ~PAGE_MASK; | |
894 | ||
895 | len = sd->len; | |
896 | if (len + offset > PAGE_SIZE) | |
897 | len = PAGE_SIZE - offset; | |
898 | ||
899 | memcpy(dst + offset, src + buf->offset, len); | |
900 | ||
901 | kunmap(page); | |
902 | buf->ops->unmap(pipe, buf, src); | |
903 | ||
904 | sg_set_page(&(sgl->sg[sgl->n]), page, len, offset); | |
eb5e89fc | 905 | } |
ec8fc870 MH |
906 | sgl->n++; |
907 | sgl->len += len; | |
eb5e89fc MH |
908 | |
909 | return len; | |
910 | } | |
911 | ||
912 | /* Faster zero-copy write by splicing */ | |
913 | static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, | |
914 | struct file *filp, loff_t *ppos, | |
915 | size_t len, unsigned int flags) | |
916 | { | |
917 | struct port *port = filp->private_data; | |
918 | struct sg_list sgl; | |
919 | ssize_t ret; | |
276a3e95 | 920 | struct port_buffer *buf; |
eb5e89fc MH |
921 | struct splice_desc sd = { |
922 | .total_len = len, | |
923 | .flags = flags, | |
924 | .pos = *ppos, | |
925 | .u.data = &sgl, | |
926 | }; | |
927 | ||
1b637046 SB |
928 | /* |
929 | * Rproc_serial does not yet support splice. To support splice | |
930 | * pipe_to_sg() must allocate dma-buffers and copy content from | |
931 | * regular pages to dma pages. And alloc_buf and free_buf must | |
932 | * support allocating and freeing such a list of dma-buffers. | |
933 | */ | |
934 | if (is_rproc_serial(port->out_vq->vdev)) | |
935 | return -EINVAL; | |
936 | ||
efe75d24 MH |
937 | ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK); |
938 | if (ret < 0) | |
939 | return ret; | |
940 | ||
276a3e95 SB |
941 | buf = alloc_buf(port->out_vq, 0, pipe->nrbufs); |
942 | if (!buf) | |
943 | return -ENOMEM; | |
944 | ||
eb5e89fc MH |
945 | sgl.n = 0; |
946 | sgl.len = 0; | |
8ca84a50 | 947 | sgl.size = pipe->nrbufs; |
276a3e95 | 948 | sgl.sg = buf->sg; |
8ca84a50 | 949 | sg_init_table(sgl.sg, sgl.size); |
eb5e89fc MH |
950 | ret = __splice_from_pipe(pipe, &sd, pipe_to_sg); |
951 | if (likely(ret > 0)) | |
276a3e95 | 952 | ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true); |
eb5e89fc | 953 | |
fe529537 | 954 | if (unlikely(ret <= 0)) |
1b637046 | 955 | free_buf(buf, true); |
eb5e89fc MH |
956 | return ret; |
957 | } | |
958 | ||
2030fa49 AS |
959 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) |
960 | { | |
961 | struct port *port; | |
962 | unsigned int ret; | |
963 | ||
964 | port = filp->private_data; | |
965 | poll_wait(filp, &port->waitqueue, wait); | |
966 | ||
8529a504 AS |
967 | if (!port->guest_connected) { |
968 | /* Port got unplugged */ | |
969 | return POLLHUP; | |
970 | } | |
2030fa49 | 971 | ret = 0; |
6df7aadc | 972 | if (!will_read_block(port)) |
2030fa49 | 973 | ret |= POLLIN | POLLRDNORM; |
cdfadfc1 | 974 | if (!will_write_block(port)) |
2030fa49 AS |
975 | ret |= POLLOUT; |
976 | if (!port->host_connected) | |
977 | ret |= POLLHUP; | |
978 | ||
979 | return ret; | |
980 | } | |
981 | ||
b353a6b8 AS |
982 | static void remove_port(struct kref *kref); |
983 | ||
2030fa49 AS |
984 | static int port_fops_release(struct inode *inode, struct file *filp) |
985 | { | |
986 | struct port *port; | |
987 | ||
988 | port = filp->private_data; | |
989 | ||
990 | /* Notify host of port being closed */ | |
991 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
992 | ||
88f251ac | 993 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
994 | port->guest_connected = false; |
995 | ||
88f251ac AS |
996 | discard_port_data(port); |
997 | ||
998 | spin_unlock_irq(&port->inbuf_lock); | |
999 | ||
cdfadfc1 AS |
1000 | spin_lock_irq(&port->outvq_lock); |
1001 | reclaim_consumed_buffers(port); | |
1002 | spin_unlock_irq(&port->outvq_lock); | |
1003 | ||
1b637046 | 1004 | reclaim_dma_bufs(); |
b353a6b8 AS |
1005 | /* |
1006 | * Locks aren't necessary here as a port can't be opened after | |
1007 | * unplug, and if a port isn't unplugged, a kref would already | |
1008 | * exist for the port. Plus, taking ports_lock here would | |
1009 | * create a dependency on other locks taken by functions | |
1010 | * inside remove_port if we're the last holder of the port, | |
1011 | * creating many problems. | |
1012 | */ | |
1013 | kref_put(&port->kref, remove_port); | |
1014 | ||
2030fa49 AS |
1015 | return 0; |
1016 | } | |
1017 | ||
1018 | static int port_fops_open(struct inode *inode, struct file *filp) | |
1019 | { | |
1020 | struct cdev *cdev = inode->i_cdev; | |
1021 | struct port *port; | |
8ad37e83 | 1022 | int ret; |
2030fa49 | 1023 | |
04950cdf | 1024 | port = find_port_by_devt(cdev->dev); |
2030fa49 AS |
1025 | filp->private_data = port; |
1026 | ||
b353a6b8 AS |
1027 | /* Prevent against a port getting hot-unplugged at the same time */ |
1028 | spin_lock_irq(&port->portdev->ports_lock); | |
1029 | kref_get(&port->kref); | |
1030 | spin_unlock_irq(&port->portdev->ports_lock); | |
1031 | ||
2030fa49 AS |
1032 | /* |
1033 | * Don't allow opening of console port devices -- that's done | |
1034 | * via /dev/hvc | |
1035 | */ | |
8ad37e83 AS |
1036 | if (is_console_port(port)) { |
1037 | ret = -ENXIO; | |
1038 | goto out; | |
1039 | } | |
2030fa49 | 1040 | |
3c7969cc AS |
1041 | /* Allow only one process to open a particular port at a time */ |
1042 | spin_lock_irq(&port->inbuf_lock); | |
1043 | if (port->guest_connected) { | |
1044 | spin_unlock_irq(&port->inbuf_lock); | |
8ad37e83 AS |
1045 | ret = -EMFILE; |
1046 | goto out; | |
3c7969cc AS |
1047 | } |
1048 | ||
1049 | port->guest_connected = true; | |
1050 | spin_unlock_irq(&port->inbuf_lock); | |
1051 | ||
cdfadfc1 AS |
1052 | spin_lock_irq(&port->outvq_lock); |
1053 | /* | |
1054 | * There might be a chance that we missed reclaiming a few | |
1055 | * buffers in the window of the port getting previously closed | |
1056 | * and opening now. | |
1057 | */ | |
1058 | reclaim_consumed_buffers(port); | |
1059 | spin_unlock_irq(&port->outvq_lock); | |
1060 | ||
299fb61c AS |
1061 | nonseekable_open(inode, filp); |
1062 | ||
2030fa49 AS |
1063 | /* Notify host of port being opened */ |
1064 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1065 | ||
1066 | return 0; | |
8ad37e83 | 1067 | out: |
b353a6b8 | 1068 | kref_put(&port->kref, remove_port); |
8ad37e83 | 1069 | return ret; |
2030fa49 AS |
1070 | } |
1071 | ||
3eae0ade AS |
1072 | static int port_fops_fasync(int fd, struct file *filp, int mode) |
1073 | { | |
1074 | struct port *port; | |
1075 | ||
1076 | port = filp->private_data; | |
1077 | return fasync_helper(fd, filp, mode, &port->async_queue); | |
1078 | } | |
1079 | ||
2030fa49 AS |
1080 | /* |
1081 | * The file operations that we support: programs in the guest can open | |
1082 | * a console device, read from it, write to it, poll for data and | |
1083 | * close it. The devices are at | |
1084 | * /dev/vport<device number>p<port number> | |
1085 | */ | |
1086 | static const struct file_operations port_fops = { | |
1087 | .owner = THIS_MODULE, | |
1088 | .open = port_fops_open, | |
1089 | .read = port_fops_read, | |
1090 | .write = port_fops_write, | |
eb5e89fc | 1091 | .splice_write = port_fops_splice_write, |
2030fa49 AS |
1092 | .poll = port_fops_poll, |
1093 | .release = port_fops_release, | |
3eae0ade | 1094 | .fasync = port_fops_fasync, |
299fb61c | 1095 | .llseek = no_llseek, |
2030fa49 AS |
1096 | }; |
1097 | ||
a23ea924 RR |
1098 | /* |
1099 | * The put_chars() callback is pretty straightforward. | |
31610434 | 1100 | * |
a23ea924 RR |
1101 | * We turn the characters into a scatter-gather list, add it to the |
1102 | * output queue and then kick the Host. Then we sit here waiting for | |
1103 | * it to finish: inefficient in theory, but in practice | |
1104 | * implementations will do it immediately (lguest's Launcher does). | |
1105 | */ | |
31610434 RR |
1106 | static int put_chars(u32 vtermno, const char *buf, int count) |
1107 | { | |
21206ede | 1108 | struct port *port; |
276a3e95 | 1109 | struct scatterlist sg[1]; |
38edf58d | 1110 | |
162a689a FD |
1111 | if (unlikely(early_put_chars)) |
1112 | return early_put_chars(vtermno, buf, count); | |
1113 | ||
38edf58d AS |
1114 | port = find_port_by_vtermno(vtermno); |
1115 | if (!port) | |
6dc69f97 | 1116 | return -EPIPE; |
31610434 | 1117 | |
276a3e95 SB |
1118 | sg_init_one(sg, buf, count); |
1119 | return __send_to_port(port, sg, 1, count, (void *)buf, false); | |
31610434 RR |
1120 | } |
1121 | ||
a23ea924 RR |
1122 | /* |
1123 | * get_chars() is the callback from the hvc_console infrastructure | |
1124 | * when an interrupt is received. | |
31610434 | 1125 | * |
203baab8 AS |
1126 | * We call out to fill_readbuf that gets us the required data from the |
1127 | * buffers that are queued up. | |
a23ea924 | 1128 | */ |
31610434 RR |
1129 | static int get_chars(u32 vtermno, char *buf, int count) |
1130 | { | |
21206ede RR |
1131 | struct port *port; |
1132 | ||
6dc69f97 AS |
1133 | /* If we've not set up the port yet, we have no input to give. */ |
1134 | if (unlikely(early_put_chars)) | |
1135 | return 0; | |
1136 | ||
38edf58d AS |
1137 | port = find_port_by_vtermno(vtermno); |
1138 | if (!port) | |
6dc69f97 | 1139 | return -EPIPE; |
21206ede | 1140 | |
31610434 | 1141 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 1142 | BUG_ON(!port->in_vq); |
31610434 | 1143 | |
b766ceed | 1144 | return fill_readbuf(port, buf, count, false); |
31610434 | 1145 | } |
31610434 | 1146 | |
cb06e367 | 1147 | static void resize_console(struct port *port) |
c2983458 | 1148 | { |
cb06e367 | 1149 | struct virtio_device *vdev; |
c2983458 | 1150 | |
2de16a49 | 1151 | /* The port could have been hot-unplugged */ |
9778829c | 1152 | if (!port || !is_console_port(port)) |
2de16a49 AS |
1153 | return; |
1154 | ||
cb06e367 | 1155 | vdev = port->portdev->vdev; |
1b637046 SB |
1156 | |
1157 | /* Don't test F_SIZE at all if we're rproc: not a valid feature! */ | |
1158 | if (!is_rproc_serial(vdev) && | |
1159 | virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) | |
9778829c | 1160 | hvc_resize(port->cons.hvc, port->cons.ws); |
c2983458 CB |
1161 | } |
1162 | ||
38edf58d | 1163 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
1164 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
1165 | { | |
38edf58d AS |
1166 | struct port *port; |
1167 | ||
1168 | port = find_port_by_vtermno(hp->vtermno); | |
1169 | if (!port) | |
1170 | return -EINVAL; | |
1171 | ||
91fcad19 | 1172 | hp->irq_requested = 1; |
cb06e367 | 1173 | resize_console(port); |
c2983458 | 1174 | |
91fcad19 CB |
1175 | return 0; |
1176 | } | |
1177 | ||
1178 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
1179 | { | |
1180 | hp->irq_requested = 0; | |
1181 | } | |
1182 | ||
17634ba2 | 1183 | /* The operations for console ports. */ |
1dff3996 | 1184 | static const struct hv_ops hv_ops = { |
971f3390 RR |
1185 | .get_chars = get_chars, |
1186 | .put_chars = put_chars, | |
1187 | .notifier_add = notifier_add_vio, | |
1188 | .notifier_del = notifier_del_vio, | |
1189 | .notifier_hangup = notifier_del_vio, | |
1190 | }; | |
1191 | ||
1192 | /* | |
1193 | * Console drivers are initialized very early so boot messages can go | |
1194 | * out, so we do things slightly differently from the generic virtio | |
1195 | * initialization of the net and block drivers. | |
1196 | * | |
1197 | * At this stage, the console is output-only. It's too early to set | |
1198 | * up a virtqueue, so we let the drivers do some boutique early-output | |
1199 | * thing. | |
1200 | */ | |
1201 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
1202 | { | |
1203 | early_put_chars = put_chars; | |
1204 | return hvc_instantiate(0, 0, &hv_ops); | |
1205 | } | |
1206 | ||
17634ba2 | 1207 | int init_port_console(struct port *port) |
cfa6d379 AS |
1208 | { |
1209 | int ret; | |
1210 | ||
1211 | /* | |
1212 | * The Host's telling us this port is a console port. Hook it | |
1213 | * up with an hvc console. | |
1214 | * | |
1215 | * To set up and manage our virtual console, we call | |
1216 | * hvc_alloc(). | |
1217 | * | |
1218 | * The first argument of hvc_alloc() is the virtual console | |
1219 | * number. The second argument is the parameter for the | |
1220 | * notification mechanism (like irq number). We currently | |
1221 | * leave this as zero, virtqueues have implicit notifications. | |
1222 | * | |
1223 | * The third argument is a "struct hv_ops" containing the | |
1224 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
1225 | * pointers. The final argument is the output buffer size: we | |
1226 | * can do any size, so we put PAGE_SIZE here. | |
1227 | */ | |
1228 | port->cons.vtermno = pdrvdata.next_vtermno; | |
1229 | ||
1230 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
1231 | if (IS_ERR(port->cons.hvc)) { | |
1232 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
1233 | dev_err(port->dev, |
1234 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
1235 | port->cons.hvc = NULL; |
1236 | return ret; | |
1237 | } | |
1238 | spin_lock_irq(&pdrvdata_lock); | |
1239 | pdrvdata.next_vtermno++; | |
1240 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
1241 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 1242 | port->guest_connected = true; |
cfa6d379 | 1243 | |
1d05160b AS |
1244 | /* |
1245 | * Start using the new console output if this is the first | |
1246 | * console to come up. | |
1247 | */ | |
1248 | if (early_put_chars) | |
1249 | early_put_chars = NULL; | |
1250 | ||
2030fa49 AS |
1251 | /* Notify host of port being opened */ |
1252 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1253 | ||
cfa6d379 AS |
1254 | return 0; |
1255 | } | |
1256 | ||
431edb8a AS |
1257 | static ssize_t show_port_name(struct device *dev, |
1258 | struct device_attribute *attr, char *buffer) | |
1259 | { | |
1260 | struct port *port; | |
1261 | ||
1262 | port = dev_get_drvdata(dev); | |
1263 | ||
1264 | return sprintf(buffer, "%s\n", port->name); | |
1265 | } | |
1266 | ||
1267 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
1268 | ||
1269 | static struct attribute *port_sysfs_entries[] = { | |
1270 | &dev_attr_name.attr, | |
1271 | NULL | |
1272 | }; | |
1273 | ||
1274 | static struct attribute_group port_attribute_group = { | |
1275 | .name = NULL, /* put in device directory */ | |
1276 | .attrs = port_sysfs_entries, | |
1277 | }; | |
1278 | ||
d99393ef AS |
1279 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, |
1280 | size_t count, loff_t *offp) | |
1281 | { | |
1282 | struct port *port; | |
1283 | char *buf; | |
1284 | ssize_t ret, out_offset, out_count; | |
1285 | ||
1286 | out_count = 1024; | |
1287 | buf = kmalloc(out_count, GFP_KERNEL); | |
1288 | if (!buf) | |
1289 | return -ENOMEM; | |
1290 | ||
1291 | port = filp->private_data; | |
1292 | out_offset = 0; | |
1293 | out_offset += snprintf(buf + out_offset, out_count, | |
1294 | "name: %s\n", port->name ? port->name : ""); | |
1295 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1296 | "guest_connected: %d\n", port->guest_connected); | |
1297 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1298 | "host_connected: %d\n", port->host_connected); | |
cdfadfc1 AS |
1299 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1300 | "outvq_full: %d\n", port->outvq_full); | |
17e5b4f2 AS |
1301 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1302 | "bytes_sent: %lu\n", port->stats.bytes_sent); | |
1303 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1304 | "bytes_received: %lu\n", | |
1305 | port->stats.bytes_received); | |
1306 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1307 | "bytes_discarded: %lu\n", | |
1308 | port->stats.bytes_discarded); | |
d99393ef AS |
1309 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1310 | "is_console: %s\n", | |
1311 | is_console_port(port) ? "yes" : "no"); | |
1312 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1313 | "console_vtermno: %u\n", port->cons.vtermno); | |
1314 | ||
1315 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
1316 | kfree(buf); | |
1317 | return ret; | |
1318 | } | |
1319 | ||
1320 | static const struct file_operations port_debugfs_ops = { | |
1321 | .owner = THIS_MODULE, | |
234e3405 | 1322 | .open = simple_open, |
d99393ef AS |
1323 | .read = debugfs_read, |
1324 | }; | |
1325 | ||
9778829c AS |
1326 | static void set_console_size(struct port *port, u16 rows, u16 cols) |
1327 | { | |
1328 | if (!port || !is_console_port(port)) | |
1329 | return; | |
1330 | ||
1331 | port->cons.ws.ws_row = rows; | |
1332 | port->cons.ws.ws_col = cols; | |
1333 | } | |
1334 | ||
c446f8fc AS |
1335 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
1336 | { | |
1337 | struct port_buffer *buf; | |
1338 | unsigned int nr_added_bufs; | |
1339 | int ret; | |
1340 | ||
1341 | nr_added_bufs = 0; | |
1342 | do { | |
276a3e95 | 1343 | buf = alloc_buf(vq, PAGE_SIZE, 0); |
c446f8fc AS |
1344 | if (!buf) |
1345 | break; | |
1346 | ||
1347 | spin_lock_irq(lock); | |
1348 | ret = add_inbuf(vq, buf); | |
1349 | if (ret < 0) { | |
1350 | spin_unlock_irq(lock); | |
1b637046 | 1351 | free_buf(buf, true); |
c446f8fc AS |
1352 | break; |
1353 | } | |
1354 | nr_added_bufs++; | |
1355 | spin_unlock_irq(lock); | |
1356 | } while (ret > 0); | |
1357 | ||
1358 | return nr_added_bufs; | |
1359 | } | |
1360 | ||
3eae0ade AS |
1361 | static void send_sigio_to_port(struct port *port) |
1362 | { | |
1363 | if (port->async_queue && port->guest_connected) | |
1364 | kill_fasync(&port->async_queue, SIGIO, POLL_OUT); | |
1365 | } | |
1366 | ||
c446f8fc AS |
1367 | static int add_port(struct ports_device *portdev, u32 id) |
1368 | { | |
1369 | char debugfs_name[16]; | |
1370 | struct port *port; | |
1371 | struct port_buffer *buf; | |
1372 | dev_t devt; | |
1373 | unsigned int nr_added_bufs; | |
1374 | int err; | |
1375 | ||
1376 | port = kmalloc(sizeof(*port), GFP_KERNEL); | |
1377 | if (!port) { | |
1378 | err = -ENOMEM; | |
1379 | goto fail; | |
1380 | } | |
b353a6b8 | 1381 | kref_init(&port->kref); |
c446f8fc AS |
1382 | |
1383 | port->portdev = portdev; | |
1384 | port->id = id; | |
1385 | ||
1386 | port->name = NULL; | |
1387 | port->inbuf = NULL; | |
1388 | port->cons.hvc = NULL; | |
3eae0ade | 1389 | port->async_queue = NULL; |
c446f8fc | 1390 | |
9778829c AS |
1391 | port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
1392 | ||
c446f8fc | 1393 | port->host_connected = port->guest_connected = false; |
17e5b4f2 | 1394 | port->stats = (struct port_stats) { 0 }; |
c446f8fc | 1395 | |
cdfadfc1 AS |
1396 | port->outvq_full = false; |
1397 | ||
c446f8fc AS |
1398 | port->in_vq = portdev->in_vqs[port->id]; |
1399 | port->out_vq = portdev->out_vqs[port->id]; | |
1400 | ||
d22a6989 AS |
1401 | port->cdev = cdev_alloc(); |
1402 | if (!port->cdev) { | |
1403 | dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); | |
1404 | err = -ENOMEM; | |
1405 | goto free_port; | |
1406 | } | |
1407 | port->cdev->ops = &port_fops; | |
c446f8fc AS |
1408 | |
1409 | devt = MKDEV(portdev->chr_major, id); | |
d22a6989 | 1410 | err = cdev_add(port->cdev, devt, 1); |
c446f8fc AS |
1411 | if (err < 0) { |
1412 | dev_err(&port->portdev->vdev->dev, | |
1413 | "Error %d adding cdev for port %u\n", err, id); | |
d22a6989 | 1414 | goto free_cdev; |
c446f8fc AS |
1415 | } |
1416 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1417 | devt, port, "vport%up%u", | |
1418 | port->portdev->drv_index, id); | |
1419 | if (IS_ERR(port->dev)) { | |
1420 | err = PTR_ERR(port->dev); | |
1421 | dev_err(&port->portdev->vdev->dev, | |
1422 | "Error %d creating device for port %u\n", | |
1423 | err, id); | |
1424 | goto free_cdev; | |
1425 | } | |
1426 | ||
1427 | spin_lock_init(&port->inbuf_lock); | |
cdfadfc1 | 1428 | spin_lock_init(&port->outvq_lock); |
c446f8fc AS |
1429 | init_waitqueue_head(&port->waitqueue); |
1430 | ||
1431 | /* Fill the in_vq with buffers so the host can send us data. */ | |
1432 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); | |
1433 | if (!nr_added_bufs) { | |
1434 | dev_err(port->dev, "Error allocating inbufs\n"); | |
1435 | err = -ENOMEM; | |
1436 | goto free_device; | |
1437 | } | |
1438 | ||
1b637046 SB |
1439 | if (is_rproc_serial(port->portdev->vdev)) |
1440 | /* | |
1441 | * For rproc_serial assume remote processor is connected. | |
1442 | * rproc_serial does not want the console port, only | |
1443 | * the generic port implementation. | |
1444 | */ | |
1445 | port->host_connected = true; | |
1446 | else if (!use_multiport(port->portdev)) { | |
1447 | /* | |
1448 | * If we're not using multiport support, | |
1449 | * this has to be a console port. | |
1450 | */ | |
c446f8fc AS |
1451 | err = init_port_console(port); |
1452 | if (err) | |
1453 | goto free_inbufs; | |
1454 | } | |
1455 | ||
1456 | spin_lock_irq(&portdev->ports_lock); | |
1457 | list_add_tail(&port->list, &port->portdev->ports); | |
1458 | spin_unlock_irq(&portdev->ports_lock); | |
1459 | ||
1460 | /* | |
1461 | * Tell the Host we're set so that it can send us various | |
1462 | * configuration parameters for this port (eg, port name, | |
1463 | * caching, whether this is a console port, etc.) | |
1464 | */ | |
1465 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
1466 | ||
1467 | if (pdrvdata.debugfs_dir) { | |
1468 | /* | |
1469 | * Finally, create the debugfs file that we can use to | |
1470 | * inspect a port's state at any time | |
1471 | */ | |
1472 | sprintf(debugfs_name, "vport%up%u", | |
1473 | port->portdev->drv_index, id); | |
1474 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, | |
1475 | pdrvdata.debugfs_dir, | |
1476 | port, | |
1477 | &port_debugfs_ops); | |
1478 | } | |
1479 | return 0; | |
1480 | ||
1481 | free_inbufs: | |
1482 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1b637046 | 1483 | free_buf(buf, true); |
c446f8fc AS |
1484 | free_device: |
1485 | device_destroy(pdrvdata.class, port->dev->devt); | |
1486 | free_cdev: | |
d22a6989 | 1487 | cdev_del(port->cdev); |
c446f8fc AS |
1488 | free_port: |
1489 | kfree(port); | |
1490 | fail: | |
1491 | /* The host might want to notify management sw about port add failure */ | |
0643e4c6 | 1492 | __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
c446f8fc AS |
1493 | return err; |
1494 | } | |
1495 | ||
b353a6b8 AS |
1496 | /* No users remain, remove all port-specific data. */ |
1497 | static void remove_port(struct kref *kref) | |
1498 | { | |
1499 | struct port *port; | |
1500 | ||
1501 | port = container_of(kref, struct port, kref); | |
1502 | ||
1503 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); | |
1504 | device_destroy(pdrvdata.class, port->dev->devt); | |
1505 | cdev_del(port->cdev); | |
1506 | ||
1507 | kfree(port->name); | |
1508 | ||
1509 | debugfs_remove(port->debugfs_file); | |
1510 | ||
1511 | kfree(port); | |
1512 | } | |
1513 | ||
a0e2dbfc AS |
1514 | static void remove_port_data(struct port *port) |
1515 | { | |
1516 | struct port_buffer *buf; | |
1517 | ||
1518 | /* Remove unused data this port might have received. */ | |
1519 | discard_port_data(port); | |
1520 | ||
1521 | reclaim_consumed_buffers(port); | |
1522 | ||
1523 | /* Remove buffers we queued up for the Host to send us data in. */ | |
1524 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1b637046 | 1525 | free_buf(buf, true); |
eb34f12b | 1526 | |
1527 | /* Free pending buffers from the out-queue. */ | |
1528 | while ((buf = virtqueue_detach_unused_buf(port->out_vq))) | |
1b637046 | 1529 | free_buf(buf, true); |
a0e2dbfc AS |
1530 | } |
1531 | ||
b353a6b8 AS |
1532 | /* |
1533 | * Port got unplugged. Remove port from portdev's list and drop the | |
1534 | * kref reference. If no userspace has this port opened, it will | |
1535 | * result in immediate removal the port. | |
1536 | */ | |
1537 | static void unplug_port(struct port *port) | |
1f7aa42d | 1538 | { |
b353a6b8 AS |
1539 | spin_lock_irq(&port->portdev->ports_lock); |
1540 | list_del(&port->list); | |
1541 | spin_unlock_irq(&port->portdev->ports_lock); | |
1542 | ||
0047634d AS |
1543 | if (port->guest_connected) { |
1544 | port->guest_connected = false; | |
1545 | port->host_connected = false; | |
1546 | wake_up_interruptible(&port->waitqueue); | |
a461e11e AS |
1547 | |
1548 | /* Let the app know the port is going down. */ | |
1549 | send_sigio_to_port(port); | |
0047634d AS |
1550 | } |
1551 | ||
1f7aa42d AS |
1552 | if (is_console_port(port)) { |
1553 | spin_lock_irq(&pdrvdata_lock); | |
1554 | list_del(&port->cons.list); | |
1555 | spin_unlock_irq(&pdrvdata_lock); | |
1556 | hvc_remove(port->cons.hvc); | |
1557 | } | |
1f7aa42d | 1558 | |
a0e2dbfc | 1559 | remove_port_data(port); |
a9cdd485 | 1560 | |
b353a6b8 AS |
1561 | /* |
1562 | * We should just assume the device itself has gone off -- | |
1563 | * else a close on an open port later will try to send out a | |
1564 | * control message. | |
1565 | */ | |
1566 | port->portdev = NULL; | |
d99393ef | 1567 | |
b353a6b8 AS |
1568 | /* |
1569 | * Locks around here are not necessary - a port can't be | |
1570 | * opened after we removed the port struct from ports_list | |
1571 | * above. | |
1572 | */ | |
1573 | kref_put(&port->kref, remove_port); | |
1f7aa42d AS |
1574 | } |
1575 | ||
17634ba2 AS |
1576 | /* Any private messages that the Host and Guest want to share */ |
1577 | static void handle_control_message(struct ports_device *portdev, | |
1578 | struct port_buffer *buf) | |
1579 | { | |
1580 | struct virtio_console_control *cpkt; | |
1581 | struct port *port; | |
431edb8a AS |
1582 | size_t name_size; |
1583 | int err; | |
17634ba2 AS |
1584 | |
1585 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
1586 | ||
1587 | port = find_port_by_id(portdev, cpkt->id); | |
f909f850 | 1588 | if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) { |
17634ba2 AS |
1589 | /* No valid header at start of buffer. Drop it. */ |
1590 | dev_dbg(&portdev->vdev->dev, | |
1591 | "Invalid index %u in control packet\n", cpkt->id); | |
1592 | return; | |
1593 | } | |
1594 | ||
1595 | switch (cpkt->event) { | |
f909f850 AS |
1596 | case VIRTIO_CONSOLE_PORT_ADD: |
1597 | if (port) { | |
1d05160b AS |
1598 | dev_dbg(&portdev->vdev->dev, |
1599 | "Port %u already added\n", port->id); | |
f909f850 AS |
1600 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
1601 | break; | |
1602 | } | |
1603 | if (cpkt->id >= portdev->config.max_nr_ports) { | |
1604 | dev_warn(&portdev->vdev->dev, | |
1605 | "Request for adding port with out-of-bound id %u, max. supported id: %u\n", | |
1606 | cpkt->id, portdev->config.max_nr_ports - 1); | |
1607 | break; | |
1608 | } | |
1609 | add_port(portdev, cpkt->id); | |
1610 | break; | |
1611 | case VIRTIO_CONSOLE_PORT_REMOVE: | |
b353a6b8 | 1612 | unplug_port(port); |
f909f850 | 1613 | break; |
17634ba2 AS |
1614 | case VIRTIO_CONSOLE_CONSOLE_PORT: |
1615 | if (!cpkt->value) | |
1616 | break; | |
1617 | if (is_console_port(port)) | |
1618 | break; | |
1619 | ||
1620 | init_port_console(port); | |
5e38483b | 1621 | complete(&early_console_added); |
17634ba2 AS |
1622 | /* |
1623 | * Could remove the port here in case init fails - but | |
1624 | * have to notify the host first. | |
1625 | */ | |
1626 | break; | |
8345adbf AS |
1627 | case VIRTIO_CONSOLE_RESIZE: { |
1628 | struct { | |
1629 | __u16 rows; | |
1630 | __u16 cols; | |
1631 | } size; | |
1632 | ||
17634ba2 AS |
1633 | if (!is_console_port(port)) |
1634 | break; | |
8345adbf AS |
1635 | |
1636 | memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), | |
1637 | sizeof(size)); | |
1638 | set_console_size(port, size.rows, size.cols); | |
1639 | ||
17634ba2 AS |
1640 | port->cons.hvc->irq_requested = 1; |
1641 | resize_console(port); | |
1642 | break; | |
8345adbf | 1643 | } |
2030fa49 AS |
1644 | case VIRTIO_CONSOLE_PORT_OPEN: |
1645 | port->host_connected = cpkt->value; | |
1646 | wake_up_interruptible(&port->waitqueue); | |
cdfadfc1 AS |
1647 | /* |
1648 | * If the host port got closed and the host had any | |
1649 | * unconsumed buffers, we'll be able to reclaim them | |
1650 | * now. | |
1651 | */ | |
1652 | spin_lock_irq(&port->outvq_lock); | |
1653 | reclaim_consumed_buffers(port); | |
1654 | spin_unlock_irq(&port->outvq_lock); | |
3eae0ade AS |
1655 | |
1656 | /* | |
1657 | * If the guest is connected, it'll be interested in | |
1658 | * knowing the host connection state changed. | |
1659 | */ | |
1660 | send_sigio_to_port(port); | |
2030fa49 | 1661 | break; |
431edb8a | 1662 | case VIRTIO_CONSOLE_PORT_NAME: |
291024ef AS |
1663 | /* |
1664 | * If we woke up after hibernation, we can get this | |
1665 | * again. Skip it in that case. | |
1666 | */ | |
1667 | if (port->name) | |
1668 | break; | |
1669 | ||
431edb8a AS |
1670 | /* |
1671 | * Skip the size of the header and the cpkt to get the size | |
1672 | * of the name that was sent | |
1673 | */ | |
1674 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
1675 | ||
1676 | port->name = kmalloc(name_size, GFP_KERNEL); | |
1677 | if (!port->name) { | |
1678 | dev_err(port->dev, | |
1679 | "Not enough space to store port name\n"); | |
1680 | break; | |
1681 | } | |
1682 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
1683 | name_size - 1); | |
1684 | port->name[name_size - 1] = 0; | |
1685 | ||
1686 | /* | |
1687 | * Since we only have one sysfs attribute, 'name', | |
1688 | * create it only if we have a name for the port. | |
1689 | */ | |
1690 | err = sysfs_create_group(&port->dev->kobj, | |
1691 | &port_attribute_group); | |
ec64213c | 1692 | if (err) { |
431edb8a AS |
1693 | dev_err(port->dev, |
1694 | "Error %d creating sysfs device attributes\n", | |
1695 | err); | |
ec64213c AS |
1696 | } else { |
1697 | /* | |
1698 | * Generate a udev event so that appropriate | |
1699 | * symlinks can be created based on udev | |
1700 | * rules. | |
1701 | */ | |
1702 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
1703 | } | |
431edb8a | 1704 | break; |
17634ba2 AS |
1705 | } |
1706 | } | |
1707 | ||
1708 | static void control_work_handler(struct work_struct *work) | |
1709 | { | |
1710 | struct ports_device *portdev; | |
1711 | struct virtqueue *vq; | |
1712 | struct port_buffer *buf; | |
1713 | unsigned int len; | |
1714 | ||
1715 | portdev = container_of(work, struct ports_device, control_work); | |
1716 | vq = portdev->c_ivq; | |
1717 | ||
1718 | spin_lock(&portdev->cvq_lock); | |
505b0451 | 1719 | while ((buf = virtqueue_get_buf(vq, &len))) { |
17634ba2 AS |
1720 | spin_unlock(&portdev->cvq_lock); |
1721 | ||
1722 | buf->len = len; | |
1723 | buf->offset = 0; | |
1724 | ||
1725 | handle_control_message(portdev, buf); | |
1726 | ||
1727 | spin_lock(&portdev->cvq_lock); | |
1728 | if (add_inbuf(portdev->c_ivq, buf) < 0) { | |
1729 | dev_warn(&portdev->vdev->dev, | |
1730 | "Error adding buffer to queue\n"); | |
1b637046 | 1731 | free_buf(buf, false); |
17634ba2 AS |
1732 | } |
1733 | } | |
1734 | spin_unlock(&portdev->cvq_lock); | |
1735 | } | |
1736 | ||
2770c5ea AS |
1737 | static void out_intr(struct virtqueue *vq) |
1738 | { | |
1739 | struct port *port; | |
1740 | ||
1741 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1742 | if (!port) | |
1743 | return; | |
1744 | ||
1745 | wake_up_interruptible(&port->waitqueue); | |
1746 | } | |
1747 | ||
17634ba2 AS |
1748 | static void in_intr(struct virtqueue *vq) |
1749 | { | |
1750 | struct port *port; | |
1751 | unsigned long flags; | |
1752 | ||
1753 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1754 | if (!port) | |
1755 | return; | |
1756 | ||
1757 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d25a9dda | 1758 | port->inbuf = get_inbuf(port); |
17634ba2 | 1759 | |
88f251ac AS |
1760 | /* |
1761 | * Don't queue up data when port is closed. This condition | |
1762 | * can be reached when a console port is not yet connected (no | |
1763 | * tty is spawned) and the host sends out data to console | |
1764 | * ports. For generic serial ports, the host won't | |
1765 | * (shouldn't) send data till the guest is connected. | |
1f805187 SB |
1766 | * However a remote device might send data before the port is |
1767 | * connected. So don't remove data from a rproc_serial device. | |
88f251ac | 1768 | */ |
1f805187 SB |
1769 | |
1770 | if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev)) | |
88f251ac AS |
1771 | discard_port_data(port); |
1772 | ||
17634ba2 AS |
1773 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1774 | ||
2030fa49 AS |
1775 | wake_up_interruptible(&port->waitqueue); |
1776 | ||
55f6bcce AS |
1777 | /* Send a SIGIO indicating new data in case the process asked for it */ |
1778 | send_sigio_to_port(port); | |
1779 | ||
17634ba2 AS |
1780 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1781 | hvc_kick(); | |
1782 | } | |
1783 | ||
1784 | static void control_intr(struct virtqueue *vq) | |
1785 | { | |
1786 | struct ports_device *portdev; | |
1787 | ||
1788 | portdev = vq->vdev->priv; | |
1789 | schedule_work(&portdev->control_work); | |
1790 | } | |
1791 | ||
7f5d810d AS |
1792 | static void config_intr(struct virtio_device *vdev) |
1793 | { | |
1794 | struct ports_device *portdev; | |
1795 | ||
1796 | portdev = vdev->priv; | |
99f905f8 | 1797 | |
4038f5b7 | 1798 | if (!use_multiport(portdev)) { |
9778829c AS |
1799 | struct port *port; |
1800 | u16 rows, cols; | |
1801 | ||
1802 | vdev->config->get(vdev, | |
1803 | offsetof(struct virtio_console_config, cols), | |
1804 | &cols, sizeof(u16)); | |
1805 | vdev->config->get(vdev, | |
1806 | offsetof(struct virtio_console_config, rows), | |
1807 | &rows, sizeof(u16)); | |
1808 | ||
1809 | port = find_port_by_id(portdev, 0); | |
1810 | set_console_size(port, rows, cols); | |
1811 | ||
4038f5b7 AS |
1812 | /* |
1813 | * We'll use this way of resizing only for legacy | |
1814 | * support. For newer userspace | |
1815 | * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages | |
1816 | * to indicate console size changes so that it can be | |
1817 | * done per-port. | |
1818 | */ | |
9778829c | 1819 | resize_console(port); |
4038f5b7 | 1820 | } |
7f5d810d AS |
1821 | } |
1822 | ||
2658a79a AS |
1823 | static int init_vqs(struct ports_device *portdev) |
1824 | { | |
1825 | vq_callback_t **io_callbacks; | |
1826 | char **io_names; | |
1827 | struct virtqueue **vqs; | |
17634ba2 | 1828 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1829 | int err; |
1830 | ||
17634ba2 AS |
1831 | nr_ports = portdev->config.max_nr_ports; |
1832 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; | |
2658a79a AS |
1833 | |
1834 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
2658a79a | 1835 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); |
2658a79a | 1836 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); |
2658a79a AS |
1837 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1838 | GFP_KERNEL); | |
2658a79a AS |
1839 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1840 | GFP_KERNEL); | |
22e132ff | 1841 | if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || |
286f9a22 | 1842 | !portdev->out_vqs) { |
2658a79a | 1843 | err = -ENOMEM; |
22e132ff | 1844 | goto free; |
2658a79a AS |
1845 | } |
1846 | ||
17634ba2 AS |
1847 | /* |
1848 | * For backward compat (newer host but older guest), the host | |
1849 | * spawns a console port first and also inits the vqs for port | |
1850 | * 0 before others. | |
1851 | */ | |
1852 | j = 0; | |
1853 | io_callbacks[j] = in_intr; | |
2770c5ea | 1854 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1855 | io_names[j] = "input"; |
1856 | io_names[j + 1] = "output"; | |
1857 | j += 2; | |
1858 | ||
1859 | if (use_multiport(portdev)) { | |
1860 | io_callbacks[j] = control_intr; | |
1861 | io_callbacks[j + 1] = NULL; | |
1862 | io_names[j] = "control-i"; | |
1863 | io_names[j + 1] = "control-o"; | |
1864 | ||
1865 | for (i = 1; i < nr_ports; i++) { | |
1866 | j += 2; | |
1867 | io_callbacks[j] = in_intr; | |
2770c5ea | 1868 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1869 | io_names[j] = "input"; |
1870 | io_names[j + 1] = "output"; | |
1871 | } | |
1872 | } | |
2658a79a AS |
1873 | /* Find the queues. */ |
1874 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1875 | io_callbacks, | |
1876 | (const char **)io_names); | |
1877 | if (err) | |
22e132ff | 1878 | goto free; |
2658a79a | 1879 | |
17634ba2 | 1880 | j = 0; |
2658a79a AS |
1881 | portdev->in_vqs[0] = vqs[0]; |
1882 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1883 | j += 2; |
1884 | if (use_multiport(portdev)) { | |
1885 | portdev->c_ivq = vqs[j]; | |
1886 | portdev->c_ovq = vqs[j + 1]; | |
1887 | ||
1888 | for (i = 1; i < nr_ports; i++) { | |
1889 | j += 2; | |
1890 | portdev->in_vqs[i] = vqs[j]; | |
1891 | portdev->out_vqs[i] = vqs[j + 1]; | |
1892 | } | |
1893 | } | |
2658a79a | 1894 | kfree(io_names); |
22e132ff | 1895 | kfree(io_callbacks); |
2658a79a AS |
1896 | kfree(vqs); |
1897 | ||
1898 | return 0; | |
1899 | ||
22e132ff | 1900 | free: |
2658a79a | 1901 | kfree(portdev->out_vqs); |
2658a79a | 1902 | kfree(portdev->in_vqs); |
22e132ff JS |
1903 | kfree(io_names); |
1904 | kfree(io_callbacks); | |
2658a79a | 1905 | kfree(vqs); |
22e132ff | 1906 | |
2658a79a AS |
1907 | return err; |
1908 | } | |
1909 | ||
fb08bd27 AS |
1910 | static const struct file_operations portdev_fops = { |
1911 | .owner = THIS_MODULE, | |
1912 | }; | |
1913 | ||
a0e2dbfc AS |
1914 | static void remove_vqs(struct ports_device *portdev) |
1915 | { | |
1916 | portdev->vdev->config->del_vqs(portdev->vdev); | |
1917 | kfree(portdev->in_vqs); | |
1918 | kfree(portdev->out_vqs); | |
1919 | } | |
1920 | ||
1921 | static void remove_controlq_data(struct ports_device *portdev) | |
1922 | { | |
1923 | struct port_buffer *buf; | |
1924 | unsigned int len; | |
1925 | ||
1926 | if (!use_multiport(portdev)) | |
1927 | return; | |
1928 | ||
1929 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) | |
1b637046 | 1930 | free_buf(buf, true); |
a0e2dbfc AS |
1931 | |
1932 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) | |
1b637046 | 1933 | free_buf(buf, true); |
a0e2dbfc AS |
1934 | } |
1935 | ||
1c85bf35 AS |
1936 | /* |
1937 | * Once we're further in boot, we get probed like any other virtio | |
1938 | * device. | |
17634ba2 AS |
1939 | * |
1940 | * If the host also supports multiple console ports, we check the | |
1941 | * config space to see how many ports the host has spawned. We | |
1942 | * initialize each port found. | |
1c85bf35 | 1943 | */ |
2223cbec | 1944 | static int virtcons_probe(struct virtio_device *vdev) |
1c85bf35 | 1945 | { |
1c85bf35 AS |
1946 | struct ports_device *portdev; |
1947 | int err; | |
17634ba2 | 1948 | bool multiport; |
5e38483b CB |
1949 | bool early = early_put_chars != NULL; |
1950 | ||
1951 | /* Ensure to read early_put_chars now */ | |
1952 | barrier(); | |
1c85bf35 AS |
1953 | |
1954 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
1955 | if (!portdev) { | |
1956 | err = -ENOMEM; | |
1957 | goto fail; | |
1958 | } | |
1959 | ||
1960 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
1961 | portdev->vdev = vdev; | |
1962 | vdev->priv = portdev; | |
1963 | ||
fb08bd27 AS |
1964 | spin_lock_irq(&pdrvdata_lock); |
1965 | portdev->drv_index = pdrvdata.index++; | |
1966 | spin_unlock_irq(&pdrvdata_lock); | |
1967 | ||
1968 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", | |
1969 | &portdev_fops); | |
1970 | if (portdev->chr_major < 0) { | |
1971 | dev_err(&vdev->dev, | |
1972 | "Error %d registering chrdev for device %u\n", | |
1973 | portdev->chr_major, portdev->drv_index); | |
1974 | err = portdev->chr_major; | |
1975 | goto free; | |
1976 | } | |
1977 | ||
17634ba2 | 1978 | multiport = false; |
17634ba2 | 1979 | portdev->config.max_nr_ports = 1; |
1b637046 SB |
1980 | |
1981 | /* Don't test MULTIPORT at all if we're rproc: not a valid feature! */ | |
1982 | if (!is_rproc_serial(vdev) && | |
1983 | virtio_config_val(vdev, VIRTIO_CONSOLE_F_MULTIPORT, | |
1984 | offsetof(struct virtio_console_config, | |
1985 | max_nr_ports), | |
1986 | &portdev->config.max_nr_ports) == 0) { | |
17634ba2 | 1987 | multiport = true; |
1b637046 | 1988 | } |
17634ba2 | 1989 | |
2658a79a AS |
1990 | err = init_vqs(portdev); |
1991 | if (err < 0) { | |
1992 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 1993 | goto free_chrdev; |
2658a79a | 1994 | } |
1c85bf35 | 1995 | |
17634ba2 AS |
1996 | spin_lock_init(&portdev->ports_lock); |
1997 | INIT_LIST_HEAD(&portdev->ports); | |
1998 | ||
1999 | if (multiport) { | |
335a64a5 AS |
2000 | unsigned int nr_added_bufs; |
2001 | ||
17634ba2 AS |
2002 | spin_lock_init(&portdev->cvq_lock); |
2003 | INIT_WORK(&portdev->control_work, &control_work_handler); | |
2004 | ||
335a64a5 AS |
2005 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
2006 | if (!nr_added_bufs) { | |
22a29eac AS |
2007 | dev_err(&vdev->dev, |
2008 | "Error allocating buffers for control queue\n"); | |
2009 | err = -ENOMEM; | |
2010 | goto free_vqs; | |
2011 | } | |
1d05160b AS |
2012 | } else { |
2013 | /* | |
2014 | * For backward compatibility: Create a console port | |
2015 | * if we're running on older host. | |
2016 | */ | |
2017 | add_port(portdev, 0); | |
17634ba2 AS |
2018 | } |
2019 | ||
6bdf2afd AS |
2020 | spin_lock_irq(&pdrvdata_lock); |
2021 | list_add_tail(&portdev->list, &pdrvdata.portdevs); | |
2022 | spin_unlock_irq(&pdrvdata_lock); | |
2023 | ||
f909f850 AS |
2024 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
2025 | VIRTIO_CONSOLE_DEVICE_READY, 1); | |
5e38483b CB |
2026 | |
2027 | /* | |
2028 | * If there was an early virtio console, assume that there are no | |
2029 | * other consoles. We need to wait until the hvc_alloc matches the | |
2030 | * hvc_instantiate, otherwise tty_open will complain, resulting in | |
2031 | * a "Warning: unable to open an initial console" boot failure. | |
2032 | * Without multiport this is done in add_port above. With multiport | |
2033 | * this might take some host<->guest communication - thus we have to | |
2034 | * wait. | |
2035 | */ | |
2036 | if (multiport && early) | |
2037 | wait_for_completion(&early_console_added); | |
2038 | ||
31610434 RR |
2039 | return 0; |
2040 | ||
22a29eac | 2041 | free_vqs: |
0643e4c6 JL |
2042 | /* The host might want to notify mgmt sw about device add failure */ |
2043 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, | |
2044 | VIRTIO_CONSOLE_DEVICE_READY, 0); | |
a0e2dbfc | 2045 | remove_vqs(portdev); |
fb08bd27 AS |
2046 | free_chrdev: |
2047 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 2048 | free: |
1c85bf35 | 2049 | kfree(portdev); |
31610434 RR |
2050 | fail: |
2051 | return err; | |
2052 | } | |
2053 | ||
7177876f AS |
2054 | static void virtcons_remove(struct virtio_device *vdev) |
2055 | { | |
2056 | struct ports_device *portdev; | |
2057 | struct port *port, *port2; | |
7177876f AS |
2058 | |
2059 | portdev = vdev->priv; | |
2060 | ||
6bdf2afd AS |
2061 | spin_lock_irq(&pdrvdata_lock); |
2062 | list_del(&portdev->list); | |
2063 | spin_unlock_irq(&pdrvdata_lock); | |
2064 | ||
02238959 AS |
2065 | /* Disable interrupts for vqs */ |
2066 | vdev->config->reset(vdev); | |
2067 | /* Finish up work that's lined up */ | |
7177876f | 2068 | cancel_work_sync(&portdev->control_work); |
7177876f AS |
2069 | |
2070 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
b353a6b8 | 2071 | unplug_port(port); |
7177876f AS |
2072 | |
2073 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
2074 | ||
e062013c AS |
2075 | /* |
2076 | * When yanking out a device, we immediately lose the | |
2077 | * (device-side) queues. So there's no point in keeping the | |
2078 | * guest side around till we drop our final reference. This | |
2079 | * also means that any ports which are in an open state will | |
2080 | * have to just stop using the port, as the vqs are going | |
2081 | * away. | |
2082 | */ | |
a0e2dbfc AS |
2083 | remove_controlq_data(portdev); |
2084 | remove_vqs(portdev); | |
7177876f AS |
2085 | kfree(portdev); |
2086 | } | |
2087 | ||
31610434 RR |
2088 | static struct virtio_device_id id_table[] = { |
2089 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
2090 | { 0 }, | |
2091 | }; | |
2092 | ||
c2983458 CB |
2093 | static unsigned int features[] = { |
2094 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 2095 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
2096 | }; |
2097 | ||
1b637046 SB |
2098 | static struct virtio_device_id rproc_serial_id_table[] = { |
2099 | #if IS_ENABLED(CONFIG_REMOTEPROC) | |
2100 | { VIRTIO_ID_RPROC_SERIAL, VIRTIO_DEV_ANY_ID }, | |
2101 | #endif | |
2102 | { 0 }, | |
2103 | }; | |
2104 | ||
2105 | static unsigned int rproc_serial_features[] = { | |
2106 | }; | |
2107 | ||
2b8f41d8 AS |
2108 | #ifdef CONFIG_PM |
2109 | static int virtcons_freeze(struct virtio_device *vdev) | |
2110 | { | |
2111 | struct ports_device *portdev; | |
2112 | struct port *port; | |
2113 | ||
2114 | portdev = vdev->priv; | |
2115 | ||
2116 | vdev->config->reset(vdev); | |
2117 | ||
c743d09d | 2118 | virtqueue_disable_cb(portdev->c_ivq); |
2b8f41d8 | 2119 | cancel_work_sync(&portdev->control_work); |
c743d09d AS |
2120 | /* |
2121 | * Once more: if control_work_handler() was running, it would | |
2122 | * enable the cb as the last step. | |
2123 | */ | |
2124 | virtqueue_disable_cb(portdev->c_ivq); | |
2b8f41d8 AS |
2125 | remove_controlq_data(portdev); |
2126 | ||
2127 | list_for_each_entry(port, &portdev->ports, list) { | |
c743d09d AS |
2128 | virtqueue_disable_cb(port->in_vq); |
2129 | virtqueue_disable_cb(port->out_vq); | |
2b8f41d8 AS |
2130 | /* |
2131 | * We'll ask the host later if the new invocation has | |
2132 | * the port opened or closed. | |
2133 | */ | |
2134 | port->host_connected = false; | |
2135 | remove_port_data(port); | |
2136 | } | |
2137 | remove_vqs(portdev); | |
2138 | ||
2139 | return 0; | |
2140 | } | |
2141 | ||
2142 | static int virtcons_restore(struct virtio_device *vdev) | |
2143 | { | |
2144 | struct ports_device *portdev; | |
2145 | struct port *port; | |
2146 | int ret; | |
2147 | ||
2148 | portdev = vdev->priv; | |
2149 | ||
2150 | ret = init_vqs(portdev); | |
2151 | if (ret) | |
2152 | return ret; | |
2153 | ||
2154 | if (use_multiport(portdev)) | |
2155 | fill_queue(portdev->c_ivq, &portdev->cvq_lock); | |
2156 | ||
2157 | list_for_each_entry(port, &portdev->ports, list) { | |
2158 | port->in_vq = portdev->in_vqs[port->id]; | |
2159 | port->out_vq = portdev->out_vqs[port->id]; | |
2160 | ||
2161 | fill_queue(port->in_vq, &port->inbuf_lock); | |
2162 | ||
2163 | /* Get port open/close status on the host */ | |
2164 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
fa8b66cc AS |
2165 | |
2166 | /* | |
2167 | * If a port was open at the time of suspending, we | |
2168 | * have to let the host know that it's still open. | |
2169 | */ | |
2170 | if (port->guest_connected) | |
2171 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
2b8f41d8 AS |
2172 | } |
2173 | return 0; | |
2174 | } | |
2175 | #endif | |
2176 | ||
31610434 | 2177 | static struct virtio_driver virtio_console = { |
c2983458 CB |
2178 | .feature_table = features, |
2179 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
2180 | .driver.name = KBUILD_MODNAME, |
2181 | .driver.owner = THIS_MODULE, | |
2182 | .id_table = id_table, | |
2183 | .probe = virtcons_probe, | |
7177876f | 2184 | .remove = virtcons_remove, |
7f5d810d | 2185 | .config_changed = config_intr, |
2b8f41d8 AS |
2186 | #ifdef CONFIG_PM |
2187 | .freeze = virtcons_freeze, | |
2188 | .restore = virtcons_restore, | |
2189 | #endif | |
31610434 RR |
2190 | }; |
2191 | ||
bcd2982a | 2192 | static struct virtio_driver virtio_rproc_serial = { |
1b637046 SB |
2193 | .feature_table = rproc_serial_features, |
2194 | .feature_table_size = ARRAY_SIZE(rproc_serial_features), | |
2195 | .driver.name = "virtio_rproc_serial", | |
2196 | .driver.owner = THIS_MODULE, | |
2197 | .id_table = rproc_serial_id_table, | |
2198 | .probe = virtcons_probe, | |
2199 | .remove = virtcons_remove, | |
2200 | }; | |
2201 | ||
31610434 RR |
2202 | static int __init init(void) |
2203 | { | |
fb08bd27 AS |
2204 | int err; |
2205 | ||
2206 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
2207 | if (IS_ERR(pdrvdata.class)) { | |
2208 | err = PTR_ERR(pdrvdata.class); | |
2209 | pr_err("Error %d creating virtio-ports class\n", err); | |
2210 | return err; | |
2211 | } | |
d99393ef AS |
2212 | |
2213 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
2214 | if (!pdrvdata.debugfs_dir) { | |
2215 | pr_warning("Error %ld creating debugfs dir for virtio-ports\n", | |
2216 | PTR_ERR(pdrvdata.debugfs_dir)); | |
2217 | } | |
38edf58d | 2218 | INIT_LIST_HEAD(&pdrvdata.consoles); |
6bdf2afd | 2219 | INIT_LIST_HEAD(&pdrvdata.portdevs); |
38edf58d | 2220 | |
33e1afc3 AK |
2221 | err = register_virtio_driver(&virtio_console); |
2222 | if (err < 0) { | |
2223 | pr_err("Error %d registering virtio driver\n", err); | |
2224 | goto free; | |
2225 | } | |
1b637046 SB |
2226 | err = register_virtio_driver(&virtio_rproc_serial); |
2227 | if (err < 0) { | |
2228 | pr_err("Error %d registering virtio rproc serial driver\n", | |
2229 | err); | |
2230 | goto unregister; | |
2231 | } | |
33e1afc3 | 2232 | return 0; |
1b637046 SB |
2233 | unregister: |
2234 | unregister_virtio_driver(&virtio_console); | |
33e1afc3 AK |
2235 | free: |
2236 | if (pdrvdata.debugfs_dir) | |
2237 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
2238 | class_destroy(pdrvdata.class); | |
2239 | return err; | |
31610434 | 2240 | } |
7177876f AS |
2241 | |
2242 | static void __exit fini(void) | |
2243 | { | |
1b637046 SB |
2244 | reclaim_dma_bufs(); |
2245 | ||
7177876f | 2246 | unregister_virtio_driver(&virtio_console); |
1b637046 | 2247 | unregister_virtio_driver(&virtio_rproc_serial); |
7177876f AS |
2248 | |
2249 | class_destroy(pdrvdata.class); | |
2250 | if (pdrvdata.debugfs_dir) | |
2251 | debugfs_remove_recursive(pdrvdata.debugfs_dir); | |
2252 | } | |
31610434 | 2253 | module_init(init); |
7177876f | 2254 | module_exit(fini); |
31610434 RR |
2255 | |
2256 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2257 | MODULE_DESCRIPTION("Virtio console driver"); | |
2258 | MODULE_LICENSE("GPL"); |