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 | 40 | #include <linux/dma-mapping.h> |
51df0acc | 41 | #include "../tty/hvc/hvc_console.h" |
31610434 | 42 | |
1b637046 SB |
43 | #define is_rproc_enabled IS_ENABLED(CONFIG_REMOTEPROC) |
44 | ||
38edf58d AS |
45 | /* |
46 | * This is a global struct for storing common data for all the devices | |
47 | * this driver handles. | |
48 | * | |
49 | * Mainly, it has a linked list for all the consoles in one place so | |
50 | * that callbacks from hvc for get_chars(), put_chars() work properly | |
51 | * across multiple devices and multiple ports per device. | |
52 | */ | |
53 | struct ports_driver_data { | |
fb08bd27 AS |
54 | /* Used for registering chardevs */ |
55 | struct class *class; | |
56 | ||
d99393ef AS |
57 | /* Used for exporting per-port information to debugfs */ |
58 | struct dentry *debugfs_dir; | |
59 | ||
6bdf2afd AS |
60 | /* List of all the devices we're handling */ |
61 | struct list_head portdevs; | |
62 | ||
d8a02bd5 RR |
63 | /* |
64 | * This is used to keep track of the number of hvc consoles | |
65 | * spawned by this driver. This number is given as the first | |
66 | * argument to hvc_alloc(). To correctly map an initial | |
67 | * console spawned via hvc_instantiate to the console being | |
68 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
69 | * | |
70 | * We also just assume the first console being initialised was | |
71 | * the first one that got used as the initial console. | |
72 | */ | |
73 | unsigned int next_vtermno; | |
74 | ||
38edf58d AS |
75 | /* All the console devices handled by this driver */ |
76 | struct list_head consoles; | |
77 | }; | |
78 | static struct ports_driver_data pdrvdata; | |
79 | ||
3826835a WY |
80 | static DEFINE_SPINLOCK(pdrvdata_lock); |
81 | static DECLARE_COMPLETION(early_console_added); | |
38edf58d | 82 | |
4f23c573 AS |
83 | /* This struct holds information that's relevant only for console ports */ |
84 | struct console { | |
85 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
86 | struct list_head list; | |
87 | ||
88 | /* The hvc device associated with this console port */ | |
89 | struct hvc_struct *hvc; | |
90 | ||
9778829c AS |
91 | /* The size of the console */ |
92 | struct winsize ws; | |
93 | ||
4f23c573 AS |
94 | /* |
95 | * This number identifies the number that we used to register | |
96 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
97 | * number passed on by the hvc callbacks to us to | |
98 | * differentiate between the other console ports handled by | |
99 | * this driver | |
100 | */ | |
101 | u32 vtermno; | |
102 | }; | |
103 | ||
fdb9a054 AS |
104 | struct port_buffer { |
105 | char *buf; | |
106 | ||
107 | /* size of the buffer in *buf above */ | |
108 | size_t size; | |
109 | ||
110 | /* used length of the buffer */ | |
111 | size_t len; | |
112 | /* offset in the buf from which to consume data */ | |
113 | size_t offset; | |
276a3e95 | 114 | |
1b637046 SB |
115 | /* DMA address of buffer */ |
116 | dma_addr_t dma; | |
117 | ||
118 | /* Device we got DMA memory from */ | |
119 | struct device *dev; | |
120 | ||
121 | /* List of pending dma buffers to free */ | |
122 | struct list_head list; | |
123 | ||
276a3e95 SB |
124 | /* If sgpages == 0 then buf is used */ |
125 | unsigned int sgpages; | |
126 | ||
127 | /* sg is used if spages > 0. sg must be the last in is struct */ | |
128 | struct scatterlist sg[0]; | |
fdb9a054 AS |
129 | }; |
130 | ||
17634ba2 AS |
131 | /* |
132 | * This is a per-device struct that stores data common to all the | |
133 | * ports for that device (vdev->priv). | |
134 | */ | |
135 | struct ports_device { | |
6bdf2afd AS |
136 | /* Next portdev in the list, head is in the pdrvdata struct */ |
137 | struct list_head list; | |
138 | ||
17634ba2 AS |
139 | /* |
140 | * Workqueue handlers where we process deferred work after | |
141 | * notification | |
142 | */ | |
143 | struct work_struct control_work; | |
eeb8a7e8 | 144 | struct work_struct config_work; |
17634ba2 AS |
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 | 154 | |
7328fa64 MT |
155 | /* max. number of ports this device can hold */ |
156 | u32 max_nr_ports; | |
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 | ||
5e59d9a1 AL |
167 | /* |
168 | * A control packet buffer for guest->host requests, protected | |
169 | * by c_ovq_lock. | |
170 | */ | |
171 | struct virtio_console_control cpkt; | |
172 | ||
17634ba2 AS |
173 | /* Array of per-port IO virtqueues */ |
174 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 | 175 | |
fb08bd27 AS |
176 | /* Major number for this device. Ports will be created as minors. */ |
177 | int chr_major; | |
17634ba2 AS |
178 | }; |
179 | ||
17e5b4f2 AS |
180 | struct port_stats { |
181 | unsigned long bytes_sent, bytes_received, bytes_discarded; | |
182 | }; | |
183 | ||
1c85bf35 | 184 | /* This struct holds the per-port data */ |
21206ede | 185 | struct port { |
17634ba2 AS |
186 | /* Next port in the list, head is in the ports_device */ |
187 | struct list_head list; | |
188 | ||
1c85bf35 AS |
189 | /* Pointer to the parent virtio_console device */ |
190 | struct ports_device *portdev; | |
fdb9a054 AS |
191 | |
192 | /* The current buffer from which data has to be fed to readers */ | |
193 | struct port_buffer *inbuf; | |
21206ede | 194 | |
203baab8 AS |
195 | /* |
196 | * To protect the operations on the in_vq associated with this | |
197 | * port. Has to be a spinlock because it can be called from | |
198 | * interrupt context (get_char()). | |
199 | */ | |
200 | spinlock_t inbuf_lock; | |
201 | ||
cdfadfc1 AS |
202 | /* Protect the operations on the out_vq. */ |
203 | spinlock_t outvq_lock; | |
204 | ||
1c85bf35 AS |
205 | /* The IO vqs for this port */ |
206 | struct virtqueue *in_vq, *out_vq; | |
207 | ||
d99393ef AS |
208 | /* File in the debugfs directory that exposes this port's information */ |
209 | struct dentry *debugfs_file; | |
210 | ||
17e5b4f2 AS |
211 | /* |
212 | * Keep count of the bytes sent, received and discarded for | |
213 | * this port for accounting and debugging purposes. These | |
214 | * counts are not reset across port open / close events. | |
215 | */ | |
216 | struct port_stats stats; | |
217 | ||
4f23c573 AS |
218 | /* |
219 | * The entries in this struct will be valid if this port is | |
220 | * hooked up to an hvc console | |
221 | */ | |
222 | struct console cons; | |
17634ba2 | 223 | |
fb08bd27 | 224 | /* Each port associates with a separate char device */ |
d22a6989 | 225 | struct cdev *cdev; |
fb08bd27 AS |
226 | struct device *dev; |
227 | ||
b353a6b8 AS |
228 | /* Reference-counting to handle port hot-unplugs and file operations */ |
229 | struct kref kref; | |
230 | ||
2030fa49 AS |
231 | /* A waitqueue for poll() or blocking read operations */ |
232 | wait_queue_head_t waitqueue; | |
233 | ||
431edb8a AS |
234 | /* The 'name' of the port that we expose via sysfs properties */ |
235 | char *name; | |
236 | ||
3eae0ade AS |
237 | /* We can notify apps of host connect / disconnect events via SIGIO */ |
238 | struct fasync_struct *async_queue; | |
239 | ||
17634ba2 AS |
240 | /* The 'id' to identify the port with the Host */ |
241 | u32 id; | |
2030fa49 | 242 | |
cdfadfc1 AS |
243 | bool outvq_full; |
244 | ||
2030fa49 AS |
245 | /* Is the host device open */ |
246 | bool host_connected; | |
3c7969cc AS |
247 | |
248 | /* We should allow only one process to open a port */ | |
249 | bool guest_connected; | |
21206ede | 250 | }; |
31610434 | 251 | |
971f3390 RR |
252 | /* This is the very early arch-specified put chars function. */ |
253 | static int (*early_put_chars)(u32, const char *, int); | |
254 | ||
38edf58d AS |
255 | static struct port *find_port_by_vtermno(u32 vtermno) |
256 | { | |
257 | struct port *port; | |
4f23c573 | 258 | struct console *cons; |
38edf58d AS |
259 | unsigned long flags; |
260 | ||
261 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
262 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
263 | if (cons->vtermno == vtermno) { | |
264 | port = container_of(cons, struct port, cons); | |
38edf58d | 265 | goto out; |
4f23c573 | 266 | } |
38edf58d AS |
267 | } |
268 | port = NULL; | |
269 | out: | |
270 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
271 | return port; | |
272 | } | |
273 | ||
04950cdf AS |
274 | static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, |
275 | dev_t dev) | |
276 | { | |
277 | struct port *port; | |
278 | unsigned long flags; | |
279 | ||
280 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
057b82be AS |
281 | list_for_each_entry(port, &portdev->ports, list) { |
282 | if (port->cdev->dev == dev) { | |
283 | kref_get(&port->kref); | |
04950cdf | 284 | goto out; |
057b82be AS |
285 | } |
286 | } | |
04950cdf AS |
287 | port = NULL; |
288 | out: | |
289 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
290 | ||
291 | return port; | |
292 | } | |
293 | ||
294 | static struct port *find_port_by_devt(dev_t dev) | |
295 | { | |
296 | struct ports_device *portdev; | |
297 | struct port *port; | |
298 | unsigned long flags; | |
299 | ||
300 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
301 | list_for_each_entry(portdev, &pdrvdata.portdevs, list) { | |
302 | port = find_port_by_devt_in_portdev(portdev, dev); | |
303 | if (port) | |
304 | goto out; | |
305 | } | |
306 | port = NULL; | |
307 | out: | |
308 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
309 | return port; | |
310 | } | |
311 | ||
17634ba2 AS |
312 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
313 | { | |
314 | struct port *port; | |
315 | unsigned long flags; | |
316 | ||
317 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
318 | list_for_each_entry(port, &portdev->ports, list) | |
319 | if (port->id == id) | |
320 | goto out; | |
321 | port = NULL; | |
322 | out: | |
323 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
324 | ||
325 | return port; | |
326 | } | |
327 | ||
203baab8 AS |
328 | static struct port *find_port_by_vq(struct ports_device *portdev, |
329 | struct virtqueue *vq) | |
330 | { | |
331 | struct port *port; | |
203baab8 AS |
332 | unsigned long flags; |
333 | ||
17634ba2 AS |
334 | spin_lock_irqsave(&portdev->ports_lock, flags); |
335 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
336 | if (port->in_vq == vq || port->out_vq == vq) |
337 | goto out; | |
203baab8 AS |
338 | port = NULL; |
339 | out: | |
17634ba2 | 340 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
341 | return port; |
342 | } | |
343 | ||
17634ba2 AS |
344 | static bool is_console_port(struct port *port) |
345 | { | |
346 | if (port->cons.hvc) | |
347 | return true; | |
348 | return false; | |
349 | } | |
350 | ||
1b637046 SB |
351 | static bool is_rproc_serial(const struct virtio_device *vdev) |
352 | { | |
353 | return is_rproc_enabled && vdev->id.device == VIRTIO_ID_RPROC_SERIAL; | |
354 | } | |
355 | ||
17634ba2 AS |
356 | static inline bool use_multiport(struct ports_device *portdev) |
357 | { | |
358 | /* | |
359 | * This condition can be true when put_chars is called from | |
360 | * early_init | |
361 | */ | |
362 | if (!portdev->vdev) | |
f580d730 | 363 | return false; |
e16e12be | 364 | return __virtio_test_bit(portdev->vdev, VIRTIO_CONSOLE_F_MULTIPORT); |
17634ba2 AS |
365 | } |
366 | ||
1b637046 SB |
367 | static DEFINE_SPINLOCK(dma_bufs_lock); |
368 | static LIST_HEAD(pending_free_dma_bufs); | |
369 | ||
370 | static void free_buf(struct port_buffer *buf, bool can_sleep) | |
fdb9a054 | 371 | { |
276a3e95 SB |
372 | unsigned int i; |
373 | ||
276a3e95 SB |
374 | for (i = 0; i < buf->sgpages; i++) { |
375 | struct page *page = sg_page(&buf->sg[i]); | |
376 | if (!page) | |
377 | break; | |
378 | put_page(page); | |
379 | } | |
380 | ||
1b637046 SB |
381 | if (!buf->dev) { |
382 | kfree(buf->buf); | |
383 | } else if (is_rproc_enabled) { | |
384 | unsigned long flags; | |
385 | ||
386 | /* dma_free_coherent requires interrupts to be enabled. */ | |
387 | if (!can_sleep) { | |
388 | /* queue up dma-buffers to be freed later */ | |
389 | spin_lock_irqsave(&dma_bufs_lock, flags); | |
390 | list_add_tail(&buf->list, &pending_free_dma_bufs); | |
391 | spin_unlock_irqrestore(&dma_bufs_lock, flags); | |
392 | return; | |
393 | } | |
394 | dma_free_coherent(buf->dev, buf->size, buf->buf, buf->dma); | |
395 | ||
396 | /* Release device refcnt and allow it to be freed */ | |
397 | put_device(buf->dev); | |
398 | } | |
399 | ||
fdb9a054 AS |
400 | kfree(buf); |
401 | } | |
402 | ||
1b637046 SB |
403 | static void reclaim_dma_bufs(void) |
404 | { | |
405 | unsigned long flags; | |
406 | struct port_buffer *buf, *tmp; | |
407 | LIST_HEAD(tmp_list); | |
408 | ||
409 | if (list_empty(&pending_free_dma_bufs)) | |
410 | return; | |
411 | ||
412 | /* Create a copy of the pending_free_dma_bufs while holding the lock */ | |
413 | spin_lock_irqsave(&dma_bufs_lock, flags); | |
414 | list_cut_position(&tmp_list, &pending_free_dma_bufs, | |
415 | pending_free_dma_bufs.prev); | |
416 | spin_unlock_irqrestore(&dma_bufs_lock, flags); | |
417 | ||
418 | /* Release the dma buffers, without irqs enabled */ | |
419 | list_for_each_entry_safe(buf, tmp, &tmp_list, list) { | |
420 | list_del(&buf->list); | |
421 | free_buf(buf, true); | |
422 | } | |
423 | } | |
424 | ||
276a3e95 SB |
425 | static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size, |
426 | int pages) | |
fdb9a054 AS |
427 | { |
428 | struct port_buffer *buf; | |
429 | ||
1b637046 SB |
430 | reclaim_dma_bufs(); |
431 | ||
276a3e95 SB |
432 | /* |
433 | * Allocate buffer and the sg list. The sg list array is allocated | |
434 | * directly after the port_buffer struct. | |
435 | */ | |
436 | buf = kmalloc(sizeof(*buf) + sizeof(struct scatterlist) * pages, | |
437 | GFP_KERNEL); | |
fdb9a054 AS |
438 | if (!buf) |
439 | goto fail; | |
276a3e95 SB |
440 | |
441 | buf->sgpages = pages; | |
442 | if (pages > 0) { | |
1b637046 | 443 | buf->dev = NULL; |
276a3e95 SB |
444 | buf->buf = NULL; |
445 | return buf; | |
446 | } | |
447 | ||
1b637046 SB |
448 | if (is_rproc_serial(vq->vdev)) { |
449 | /* | |
450 | * Allocate DMA memory from ancestor. When a virtio | |
451 | * device is created by remoteproc, the DMA memory is | |
452 | * associated with the grandparent device: | |
453 | * vdev => rproc => platform-dev. | |
1b637046 SB |
454 | */ |
455 | if (!vq->vdev->dev.parent || !vq->vdev->dev.parent->parent) | |
456 | goto free_buf; | |
457 | buf->dev = vq->vdev->dev.parent->parent; | |
458 | ||
459 | /* Increase device refcnt to avoid freeing it */ | |
460 | get_device(buf->dev); | |
461 | buf->buf = dma_alloc_coherent(buf->dev, buf_size, &buf->dma, | |
462 | GFP_KERNEL); | |
463 | } else { | |
464 | buf->dev = NULL; | |
465 | buf->buf = kmalloc(buf_size, GFP_KERNEL); | |
466 | } | |
467 | ||
fdb9a054 AS |
468 | if (!buf->buf) |
469 | goto free_buf; | |
470 | buf->len = 0; | |
471 | buf->offset = 0; | |
472 | buf->size = buf_size; | |
473 | return buf; | |
474 | ||
475 | free_buf: | |
476 | kfree(buf); | |
477 | fail: | |
478 | return NULL; | |
479 | } | |
480 | ||
a3cde449 | 481 | /* Callers should take appropriate locks */ |
defde669 | 482 | static struct port_buffer *get_inbuf(struct port *port) |
a3cde449 AS |
483 | { |
484 | struct port_buffer *buf; | |
a3cde449 AS |
485 | unsigned int len; |
486 | ||
d25a9dda AS |
487 | if (port->inbuf) |
488 | return port->inbuf; | |
489 | ||
490 | buf = virtqueue_get_buf(port->in_vq, &len); | |
a3cde449 AS |
491 | if (buf) { |
492 | buf->len = len; | |
493 | buf->offset = 0; | |
17e5b4f2 | 494 | port->stats.bytes_received += len; |
a3cde449 AS |
495 | } |
496 | return buf; | |
497 | } | |
498 | ||
e27b5198 AS |
499 | /* |
500 | * Create a scatter-gather list representing our input buffer and put | |
501 | * it in the queue. | |
502 | * | |
503 | * Callers should take appropriate locks. | |
504 | */ | |
203baab8 | 505 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
506 | { |
507 | struct scatterlist sg[1]; | |
203baab8 | 508 | int ret; |
1c85bf35 | 509 | |
e27b5198 AS |
510 | sg_init_one(sg, buf->buf, buf->size); |
511 | ||
6797999d | 512 | ret = virtqueue_add_inbuf(vq, sg, 1, buf, GFP_ATOMIC); |
505b0451 | 513 | virtqueue_kick(vq); |
49e86f16 AS |
514 | if (!ret) |
515 | ret = vq->num_free; | |
203baab8 AS |
516 | return ret; |
517 | } | |
518 | ||
88f251ac AS |
519 | /* Discard any unread data this port has. Callers lockers. */ |
520 | static void discard_port_data(struct port *port) | |
521 | { | |
522 | struct port_buffer *buf; | |
2d24cdaa | 523 | unsigned int err; |
88f251ac | 524 | |
d7a62cd0 AS |
525 | if (!port->portdev) { |
526 | /* Device has been unplugged. vqs are already gone. */ | |
527 | return; | |
528 | } | |
2d24cdaa | 529 | buf = get_inbuf(port); |
88f251ac | 530 | |
ce072a0c | 531 | err = 0; |
d6933561 | 532 | while (buf) { |
17e5b4f2 | 533 | port->stats.bytes_discarded += buf->len - buf->offset; |
2d24cdaa | 534 | if (add_inbuf(port->in_vq, buf) < 0) { |
ce072a0c | 535 | err++; |
1b637046 | 536 | free_buf(buf, false); |
d6933561 | 537 | } |
2d24cdaa AS |
538 | port->inbuf = NULL; |
539 | buf = get_inbuf(port); | |
88f251ac | 540 | } |
ce072a0c | 541 | if (err) |
d6933561 | 542 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", |
ce072a0c | 543 | err); |
88f251ac AS |
544 | } |
545 | ||
203baab8 AS |
546 | static bool port_has_data(struct port *port) |
547 | { | |
548 | unsigned long flags; | |
549 | bool ret; | |
550 | ||
d25a9dda | 551 | ret = false; |
203baab8 | 552 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 553 | port->inbuf = get_inbuf(port); |
d25a9dda | 554 | if (port->inbuf) |
d6933561 | 555 | ret = true; |
d25a9dda | 556 | |
203baab8 | 557 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
558 | return ret; |
559 | } | |
560 | ||
3425e706 AS |
561 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
562 | unsigned int event, unsigned int value) | |
17634ba2 AS |
563 | { |
564 | struct scatterlist sg[1]; | |
17634ba2 | 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 | vq = portdev->c_ovq; |
17634ba2 | 572 | |
9ba5c80b | 573 | spin_lock(&portdev->c_ovq_lock); |
5e59d9a1 AL |
574 | |
575 | portdev->cpkt.id = cpu_to_virtio32(portdev->vdev, port_id); | |
576 | portdev->cpkt.event = cpu_to_virtio16(portdev->vdev, event); | |
577 | portdev->cpkt.value = cpu_to_virtio16(portdev->vdev, value); | |
578 | ||
579 | sg_init_one(sg, &portdev->cpkt, sizeof(struct virtio_console_control)); | |
580 | ||
581 | if (virtqueue_add_outbuf(vq, sg, 1, &portdev->cpkt, GFP_ATOMIC) == 0) { | |
505b0451 | 582 | virtqueue_kick(vq); |
40e4dc53 HG |
583 | while (!virtqueue_get_buf(vq, &len) |
584 | && !virtqueue_is_broken(vq)) | |
17634ba2 AS |
585 | cpu_relax(); |
586 | } | |
5e59d9a1 | 587 | |
9ba5c80b | 588 | spin_unlock(&portdev->c_ovq_lock); |
17634ba2 AS |
589 | return 0; |
590 | } | |
591 | ||
3425e706 AS |
592 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
593 | unsigned int value) | |
594 | { | |
84ec06c5 AS |
595 | /* Did the port get unplugged before userspace closed it? */ |
596 | if (port->portdev) | |
597 | return __send_control_msg(port->portdev, port->id, event, value); | |
598 | return 0; | |
3425e706 AS |
599 | } |
600 | ||
eb5e89fc | 601 | |
cdfadfc1 AS |
602 | /* Callers must take the port->outvq_lock */ |
603 | static void reclaim_consumed_buffers(struct port *port) | |
604 | { | |
276a3e95 | 605 | struct port_buffer *buf; |
cdfadfc1 AS |
606 | unsigned int len; |
607 | ||
d7a62cd0 AS |
608 | if (!port->portdev) { |
609 | /* Device has been unplugged. vqs are already gone. */ | |
610 | return; | |
611 | } | |
276a3e95 | 612 | while ((buf = virtqueue_get_buf(port->out_vq, &len))) { |
1b637046 | 613 | free_buf(buf, false); |
cdfadfc1 AS |
614 | port->outvq_full = false; |
615 | } | |
616 | } | |
617 | ||
eb5e89fc MH |
618 | static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, |
619 | int nents, size_t in_count, | |
276a3e95 | 620 | void *data, bool nonblock) |
f997f00b | 621 | { |
f997f00b | 622 | struct virtqueue *out_vq; |
589575a2 | 623 | int err; |
cdfadfc1 | 624 | unsigned long flags; |
f997f00b AS |
625 | unsigned int len; |
626 | ||
627 | out_vq = port->out_vq; | |
628 | ||
cdfadfc1 AS |
629 | spin_lock_irqsave(&port->outvq_lock, flags); |
630 | ||
631 | reclaim_consumed_buffers(port); | |
632 | ||
6797999d | 633 | err = virtqueue_add_outbuf(out_vq, sg, nents, data, GFP_ATOMIC); |
f997f00b AS |
634 | |
635 | /* Tell Host to go! */ | |
505b0451 | 636 | virtqueue_kick(out_vq); |
f997f00b | 637 | |
589575a2 | 638 | if (err) { |
9ff4cfab | 639 | in_count = 0; |
cdfadfc1 | 640 | goto done; |
f997f00b AS |
641 | } |
642 | ||
589575a2 | 643 | if (out_vq->num_free == 0) |
cdfadfc1 AS |
644 | port->outvq_full = true; |
645 | ||
646 | if (nonblock) | |
647 | goto done; | |
648 | ||
649 | /* | |
650 | * Wait till the host acknowledges it pushed out the data we | |
531295e6 AS |
651 | * sent. This is done for data from the hvc_console; the tty |
652 | * operations are performed with spinlocks held so we can't | |
653 | * sleep here. An alternative would be to copy the data to a | |
654 | * buffer and relax the spinning requirement. The downside is | |
655 | * we need to kmalloc a GFP_ATOMIC buffer each time the | |
656 | * console driver writes something out. | |
cdfadfc1 | 657 | */ |
40e4dc53 HG |
658 | while (!virtqueue_get_buf(out_vq, &len) |
659 | && !virtqueue_is_broken(out_vq)) | |
f997f00b | 660 | cpu_relax(); |
cdfadfc1 AS |
661 | done: |
662 | spin_unlock_irqrestore(&port->outvq_lock, flags); | |
17e5b4f2 AS |
663 | |
664 | port->stats.bytes_sent += in_count; | |
cdfadfc1 AS |
665 | /* |
666 | * We're expected to return the amount of data we wrote -- all | |
667 | * of it | |
668 | */ | |
9ff4cfab | 669 | return in_count; |
f997f00b AS |
670 | } |
671 | ||
203baab8 AS |
672 | /* |
673 | * Give out the data that's requested from the buffer that we have | |
674 | * queued up. | |
675 | */ | |
48b36066 MT |
676 | static ssize_t fill_readbuf(struct port *port, char __user *out_buf, |
677 | size_t out_count, bool to_user) | |
203baab8 AS |
678 | { |
679 | struct port_buffer *buf; | |
680 | unsigned long flags; | |
681 | ||
682 | if (!out_count || !port_has_data(port)) | |
683 | return 0; | |
684 | ||
685 | buf = port->inbuf; | |
b766ceed | 686 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 687 | |
b766ceed AS |
688 | if (to_user) { |
689 | ssize_t ret; | |
690 | ||
691 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
692 | if (ret) | |
693 | return -EFAULT; | |
694 | } else { | |
48b36066 MT |
695 | memcpy((__force char *)out_buf, buf->buf + buf->offset, |
696 | out_count); | |
b766ceed | 697 | } |
203baab8 | 698 | |
203baab8 AS |
699 | buf->offset += out_count; |
700 | ||
701 | if (buf->offset == buf->len) { | |
702 | /* | |
703 | * We're done using all the data in this buffer. | |
704 | * Re-queue so that the Host can send us more data. | |
705 | */ | |
706 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
707 | port->inbuf = NULL; | |
708 | ||
709 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 710 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
711 | |
712 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
713 | } | |
b766ceed | 714 | /* Return the number of bytes actually copied */ |
203baab8 | 715 | return out_count; |
e27b5198 AS |
716 | } |
717 | ||
2030fa49 | 718 | /* The condition that must be true for polling to end */ |
60caacd3 | 719 | static bool will_read_block(struct port *port) |
2030fa49 | 720 | { |
3709ea7a AS |
721 | if (!port->guest_connected) { |
722 | /* Port got hot-unplugged. Let's exit. */ | |
723 | return false; | |
724 | } | |
60caacd3 | 725 | return !port_has_data(port) && port->host_connected; |
2030fa49 AS |
726 | } |
727 | ||
cdfadfc1 AS |
728 | static bool will_write_block(struct port *port) |
729 | { | |
730 | bool ret; | |
731 | ||
60e5e0b8 AS |
732 | if (!port->guest_connected) { |
733 | /* Port got hot-unplugged. Let's exit. */ | |
734 | return false; | |
735 | } | |
cdfadfc1 AS |
736 | if (!port->host_connected) |
737 | return true; | |
738 | ||
739 | spin_lock_irq(&port->outvq_lock); | |
740 | /* | |
741 | * Check if the Host has consumed any buffers since we last | |
742 | * sent data (this is only applicable for nonblocking ports). | |
743 | */ | |
744 | reclaim_consumed_buffers(port); | |
745 | ret = port->outvq_full; | |
746 | spin_unlock_irq(&port->outvq_lock); | |
747 | ||
748 | return ret; | |
749 | } | |
750 | ||
2030fa49 AS |
751 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, |
752 | size_t count, loff_t *offp) | |
753 | { | |
754 | struct port *port; | |
755 | ssize_t ret; | |
756 | ||
757 | port = filp->private_data; | |
758 | ||
96f97a83 AS |
759 | /* Port is hot-unplugged. */ |
760 | if (!port->guest_connected) | |
761 | return -ENODEV; | |
762 | ||
2030fa49 AS |
763 | if (!port_has_data(port)) { |
764 | /* | |
765 | * If nothing's connected on the host just return 0 in | |
766 | * case of list_empty; this tells the userspace app | |
767 | * that there's no connection | |
768 | */ | |
769 | if (!port->host_connected) | |
770 | return 0; | |
771 | if (filp->f_flags & O_NONBLOCK) | |
772 | return -EAGAIN; | |
773 | ||
a08fa92d AS |
774 | ret = wait_event_freezable(port->waitqueue, |
775 | !will_read_block(port)); | |
2030fa49 AS |
776 | if (ret < 0) |
777 | return ret; | |
778 | } | |
96f97a83 | 779 | /* Port got hot-unplugged while we were waiting above. */ |
b3dddb9e AS |
780 | if (!port->guest_connected) |
781 | return -ENODEV; | |
2030fa49 AS |
782 | /* |
783 | * We could've received a disconnection message while we were | |
784 | * waiting for more data. | |
785 | * | |
786 | * This check is not clubbed in the if() statement above as we | |
787 | * might receive some data as well as the host could get | |
788 | * disconnected after we got woken up from our wait. So we | |
789 | * really want to give off whatever data we have and only then | |
790 | * check for host_connected. | |
791 | */ | |
792 | if (!port_has_data(port) && !port->host_connected) | |
793 | return 0; | |
794 | ||
795 | return fill_readbuf(port, ubuf, count, true); | |
796 | } | |
797 | ||
efe75d24 MH |
798 | static int wait_port_writable(struct port *port, bool nonblock) |
799 | { | |
800 | int ret; | |
801 | ||
802 | if (will_write_block(port)) { | |
803 | if (nonblock) | |
804 | return -EAGAIN; | |
805 | ||
806 | ret = wait_event_freezable(port->waitqueue, | |
807 | !will_write_block(port)); | |
808 | if (ret < 0) | |
809 | return ret; | |
810 | } | |
811 | /* Port got hot-unplugged. */ | |
812 | if (!port->guest_connected) | |
813 | return -ENODEV; | |
814 | ||
815 | return 0; | |
816 | } | |
817 | ||
2030fa49 AS |
818 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, |
819 | size_t count, loff_t *offp) | |
820 | { | |
821 | struct port *port; | |
276a3e95 | 822 | struct port_buffer *buf; |
2030fa49 | 823 | ssize_t ret; |
cdfadfc1 | 824 | bool nonblock; |
276a3e95 | 825 | struct scatterlist sg[1]; |
2030fa49 | 826 | |
65745422 AS |
827 | /* Userspace could be out to fool us */ |
828 | if (!count) | |
829 | return 0; | |
830 | ||
2030fa49 AS |
831 | port = filp->private_data; |
832 | ||
cdfadfc1 AS |
833 | nonblock = filp->f_flags & O_NONBLOCK; |
834 | ||
efe75d24 MH |
835 | ret = wait_port_writable(port, nonblock); |
836 | if (ret < 0) | |
837 | return ret; | |
cdfadfc1 | 838 | |
2030fa49 AS |
839 | count = min((size_t)(32 * 1024), count); |
840 | ||
276a3e95 | 841 | buf = alloc_buf(port->out_vq, count, 0); |
2030fa49 AS |
842 | if (!buf) |
843 | return -ENOMEM; | |
844 | ||
276a3e95 | 845 | ret = copy_from_user(buf->buf, ubuf, count); |
2030fa49 AS |
846 | if (ret) { |
847 | ret = -EFAULT; | |
848 | goto free_buf; | |
849 | } | |
850 | ||
531295e6 AS |
851 | /* |
852 | * We now ask send_buf() to not spin for generic ports -- we | |
853 | * can re-use the same code path that non-blocking file | |
854 | * descriptors take for blocking file descriptors since the | |
855 | * wait is already done and we're certain the write will go | |
856 | * through to the host. | |
857 | */ | |
858 | nonblock = true; | |
276a3e95 SB |
859 | sg_init_one(sg, buf->buf, count); |
860 | ret = __send_to_port(port, sg, 1, count, buf, nonblock); | |
cdfadfc1 AS |
861 | |
862 | if (nonblock && ret > 0) | |
863 | goto out; | |
864 | ||
2030fa49 | 865 | free_buf: |
1b637046 | 866 | free_buf(buf, true); |
cdfadfc1 | 867 | out: |
2030fa49 AS |
868 | return ret; |
869 | } | |
870 | ||
eb5e89fc MH |
871 | struct sg_list { |
872 | unsigned int n; | |
8ca84a50 | 873 | unsigned int size; |
eb5e89fc MH |
874 | size_t len; |
875 | struct scatterlist *sg; | |
876 | }; | |
877 | ||
878 | static int pipe_to_sg(struct pipe_inode_info *pipe, struct pipe_buffer *buf, | |
879 | struct splice_desc *sd) | |
880 | { | |
881 | struct sg_list *sgl = sd->u.data; | |
ec8fc870 | 882 | unsigned int offset, len; |
eb5e89fc | 883 | |
8ca84a50 | 884 | if (sgl->n == sgl->size) |
eb5e89fc MH |
885 | return 0; |
886 | ||
887 | /* Try lock this page */ | |
ca76f5b6 | 888 | if (pipe_buf_steal(pipe, buf) == 0) { |
eb5e89fc MH |
889 | /* Get reference and unlock page for moving */ |
890 | get_page(buf->page); | |
891 | unlock_page(buf->page); | |
892 | ||
893 | len = min(buf->len, sd->len); | |
894 | sg_set_page(&(sgl->sg[sgl->n]), buf->page, len, buf->offset); | |
ec8fc870 MH |
895 | } else { |
896 | /* Failback to copying a page */ | |
897 | struct page *page = alloc_page(GFP_KERNEL); | |
c9efe511 | 898 | char *src; |
ec8fc870 MH |
899 | |
900 | if (!page) | |
901 | return -ENOMEM; | |
ec8fc870 MH |
902 | |
903 | offset = sd->pos & ~PAGE_MASK; | |
904 | ||
905 | len = sd->len; | |
906 | if (len + offset > PAGE_SIZE) | |
907 | len = PAGE_SIZE - offset; | |
908 | ||
fbb32750 | 909 | src = kmap_atomic(buf->page); |
c9efe511 | 910 | memcpy(page_address(page) + offset, src + buf->offset, len); |
fbb32750 | 911 | kunmap_atomic(src); |
ec8fc870 MH |
912 | |
913 | sg_set_page(&(sgl->sg[sgl->n]), page, len, offset); | |
eb5e89fc | 914 | } |
ec8fc870 MH |
915 | sgl->n++; |
916 | sgl->len += len; | |
eb5e89fc MH |
917 | |
918 | return len; | |
919 | } | |
920 | ||
921 | /* Faster zero-copy write by splicing */ | |
922 | static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, | |
923 | struct file *filp, loff_t *ppos, | |
924 | size_t len, unsigned int flags) | |
925 | { | |
926 | struct port *port = filp->private_data; | |
927 | struct sg_list sgl; | |
928 | ssize_t ret; | |
276a3e95 | 929 | struct port_buffer *buf; |
eb5e89fc MH |
930 | struct splice_desc sd = { |
931 | .total_len = len, | |
932 | .flags = flags, | |
933 | .pos = *ppos, | |
934 | .u.data = &sgl, | |
935 | }; | |
936 | ||
1b637046 SB |
937 | /* |
938 | * Rproc_serial does not yet support splice. To support splice | |
939 | * pipe_to_sg() must allocate dma-buffers and copy content from | |
940 | * regular pages to dma pages. And alloc_buf and free_buf must | |
941 | * support allocating and freeing such a list of dma-buffers. | |
942 | */ | |
943 | if (is_rproc_serial(port->out_vq->vdev)) | |
944 | return -EINVAL; | |
945 | ||
68c034fe YY |
946 | /* |
947 | * pipe->nrbufs == 0 means there are no data to transfer, | |
948 | * so this returns just 0 for no data. | |
949 | */ | |
2b4fbf02 YY |
950 | pipe_lock(pipe); |
951 | if (!pipe->nrbufs) { | |
952 | ret = 0; | |
953 | goto error_out; | |
954 | } | |
68c034fe | 955 | |
efe75d24 MH |
956 | ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK); |
957 | if (ret < 0) | |
2b4fbf02 | 958 | goto error_out; |
efe75d24 | 959 | |
276a3e95 | 960 | buf = alloc_buf(port->out_vq, 0, pipe->nrbufs); |
2b4fbf02 YY |
961 | if (!buf) { |
962 | ret = -ENOMEM; | |
963 | goto error_out; | |
964 | } | |
276a3e95 | 965 | |
eb5e89fc MH |
966 | sgl.n = 0; |
967 | sgl.len = 0; | |
8ca84a50 | 968 | sgl.size = pipe->nrbufs; |
276a3e95 | 969 | sgl.sg = buf->sg; |
8ca84a50 | 970 | sg_init_table(sgl.sg, sgl.size); |
eb5e89fc | 971 | ret = __splice_from_pipe(pipe, &sd, pipe_to_sg); |
2b4fbf02 | 972 | pipe_unlock(pipe); |
eb5e89fc | 973 | if (likely(ret > 0)) |
276a3e95 | 974 | ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true); |
eb5e89fc | 975 | |
fe529537 | 976 | if (unlikely(ret <= 0)) |
1b637046 | 977 | free_buf(buf, true); |
eb5e89fc | 978 | return ret; |
2b4fbf02 YY |
979 | |
980 | error_out: | |
981 | pipe_unlock(pipe); | |
982 | return ret; | |
eb5e89fc MH |
983 | } |
984 | ||
2030fa49 AS |
985 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) |
986 | { | |
987 | struct port *port; | |
988 | unsigned int ret; | |
989 | ||
990 | port = filp->private_data; | |
991 | poll_wait(filp, &port->waitqueue, wait); | |
992 | ||
8529a504 AS |
993 | if (!port->guest_connected) { |
994 | /* Port got unplugged */ | |
995 | return POLLHUP; | |
996 | } | |
2030fa49 | 997 | ret = 0; |
6df7aadc | 998 | if (!will_read_block(port)) |
2030fa49 | 999 | ret |= POLLIN | POLLRDNORM; |
cdfadfc1 | 1000 | if (!will_write_block(port)) |
2030fa49 AS |
1001 | ret |= POLLOUT; |
1002 | if (!port->host_connected) | |
1003 | ret |= POLLHUP; | |
1004 | ||
1005 | return ret; | |
1006 | } | |
1007 | ||
b353a6b8 AS |
1008 | static void remove_port(struct kref *kref); |
1009 | ||
2030fa49 AS |
1010 | static int port_fops_release(struct inode *inode, struct file *filp) |
1011 | { | |
1012 | struct port *port; | |
1013 | ||
1014 | port = filp->private_data; | |
1015 | ||
1016 | /* Notify host of port being closed */ | |
1017 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
1018 | ||
88f251ac | 1019 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
1020 | port->guest_connected = false; |
1021 | ||
88f251ac AS |
1022 | discard_port_data(port); |
1023 | ||
1024 | spin_unlock_irq(&port->inbuf_lock); | |
1025 | ||
cdfadfc1 AS |
1026 | spin_lock_irq(&port->outvq_lock); |
1027 | reclaim_consumed_buffers(port); | |
1028 | spin_unlock_irq(&port->outvq_lock); | |
1029 | ||
1b637046 | 1030 | reclaim_dma_bufs(); |
b353a6b8 AS |
1031 | /* |
1032 | * Locks aren't necessary here as a port can't be opened after | |
1033 | * unplug, and if a port isn't unplugged, a kref would already | |
1034 | * exist for the port. Plus, taking ports_lock here would | |
1035 | * create a dependency on other locks taken by functions | |
1036 | * inside remove_port if we're the last holder of the port, | |
1037 | * creating many problems. | |
1038 | */ | |
1039 | kref_put(&port->kref, remove_port); | |
1040 | ||
2030fa49 AS |
1041 | return 0; |
1042 | } | |
1043 | ||
1044 | static int port_fops_open(struct inode *inode, struct file *filp) | |
1045 | { | |
1046 | struct cdev *cdev = inode->i_cdev; | |
1047 | struct port *port; | |
8ad37e83 | 1048 | int ret; |
2030fa49 | 1049 | |
057b82be | 1050 | /* We get the port with a kref here */ |
04950cdf | 1051 | port = find_port_by_devt(cdev->dev); |
671bdea2 AS |
1052 | if (!port) { |
1053 | /* Port was unplugged before we could proceed */ | |
1054 | return -ENXIO; | |
1055 | } | |
2030fa49 AS |
1056 | filp->private_data = port; |
1057 | ||
1058 | /* | |
1059 | * Don't allow opening of console port devices -- that's done | |
1060 | * via /dev/hvc | |
1061 | */ | |
8ad37e83 AS |
1062 | if (is_console_port(port)) { |
1063 | ret = -ENXIO; | |
1064 | goto out; | |
1065 | } | |
2030fa49 | 1066 | |
3c7969cc AS |
1067 | /* Allow only one process to open a particular port at a time */ |
1068 | spin_lock_irq(&port->inbuf_lock); | |
1069 | if (port->guest_connected) { | |
1070 | spin_unlock_irq(&port->inbuf_lock); | |
74ff582c | 1071 | ret = -EBUSY; |
8ad37e83 | 1072 | goto out; |
3c7969cc AS |
1073 | } |
1074 | ||
1075 | port->guest_connected = true; | |
1076 | spin_unlock_irq(&port->inbuf_lock); | |
1077 | ||
cdfadfc1 AS |
1078 | spin_lock_irq(&port->outvq_lock); |
1079 | /* | |
1080 | * There might be a chance that we missed reclaiming a few | |
1081 | * buffers in the window of the port getting previously closed | |
1082 | * and opening now. | |
1083 | */ | |
1084 | reclaim_consumed_buffers(port); | |
1085 | spin_unlock_irq(&port->outvq_lock); | |
1086 | ||
299fb61c AS |
1087 | nonseekable_open(inode, filp); |
1088 | ||
2030fa49 AS |
1089 | /* Notify host of port being opened */ |
1090 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1091 | ||
1092 | return 0; | |
8ad37e83 | 1093 | out: |
b353a6b8 | 1094 | kref_put(&port->kref, remove_port); |
8ad37e83 | 1095 | return ret; |
2030fa49 AS |
1096 | } |
1097 | ||
3eae0ade AS |
1098 | static int port_fops_fasync(int fd, struct file *filp, int mode) |
1099 | { | |
1100 | struct port *port; | |
1101 | ||
1102 | port = filp->private_data; | |
1103 | return fasync_helper(fd, filp, mode, &port->async_queue); | |
1104 | } | |
1105 | ||
2030fa49 AS |
1106 | /* |
1107 | * The file operations that we support: programs in the guest can open | |
1108 | * a console device, read from it, write to it, poll for data and | |
1109 | * close it. The devices are at | |
1110 | * /dev/vport<device number>p<port number> | |
1111 | */ | |
1112 | static const struct file_operations port_fops = { | |
1113 | .owner = THIS_MODULE, | |
1114 | .open = port_fops_open, | |
1115 | .read = port_fops_read, | |
1116 | .write = port_fops_write, | |
eb5e89fc | 1117 | .splice_write = port_fops_splice_write, |
2030fa49 AS |
1118 | .poll = port_fops_poll, |
1119 | .release = port_fops_release, | |
3eae0ade | 1120 | .fasync = port_fops_fasync, |
299fb61c | 1121 | .llseek = no_llseek, |
2030fa49 AS |
1122 | }; |
1123 | ||
a23ea924 RR |
1124 | /* |
1125 | * The put_chars() callback is pretty straightforward. | |
31610434 | 1126 | * |
a23ea924 RR |
1127 | * We turn the characters into a scatter-gather list, add it to the |
1128 | * output queue and then kick the Host. Then we sit here waiting for | |
1129 | * it to finish: inefficient in theory, but in practice | |
ecda85e7 | 1130 | * implementations will do it immediately. |
a23ea924 | 1131 | */ |
31610434 RR |
1132 | static int put_chars(u32 vtermno, const char *buf, int count) |
1133 | { | |
21206ede | 1134 | struct port *port; |
276a3e95 | 1135 | struct scatterlist sg[1]; |
c4baad50 OS |
1136 | void *data; |
1137 | int ret; | |
38edf58d | 1138 | |
162a689a FD |
1139 | if (unlikely(early_put_chars)) |
1140 | return early_put_chars(vtermno, buf, count); | |
1141 | ||
38edf58d AS |
1142 | port = find_port_by_vtermno(vtermno); |
1143 | if (!port) | |
6dc69f97 | 1144 | return -EPIPE; |
31610434 | 1145 | |
c4baad50 OS |
1146 | data = kmemdup(buf, count, GFP_ATOMIC); |
1147 | if (!data) | |
1148 | return -ENOMEM; | |
1149 | ||
1150 | sg_init_one(sg, data, count); | |
1151 | ret = __send_to_port(port, sg, 1, count, data, false); | |
1152 | kfree(data); | |
1153 | return ret; | |
31610434 RR |
1154 | } |
1155 | ||
a23ea924 RR |
1156 | /* |
1157 | * get_chars() is the callback from the hvc_console infrastructure | |
1158 | * when an interrupt is received. | |
31610434 | 1159 | * |
203baab8 AS |
1160 | * We call out to fill_readbuf that gets us the required data from the |
1161 | * buffers that are queued up. | |
a23ea924 | 1162 | */ |
31610434 RR |
1163 | static int get_chars(u32 vtermno, char *buf, int count) |
1164 | { | |
21206ede RR |
1165 | struct port *port; |
1166 | ||
6dc69f97 AS |
1167 | /* If we've not set up the port yet, we have no input to give. */ |
1168 | if (unlikely(early_put_chars)) | |
1169 | return 0; | |
1170 | ||
38edf58d AS |
1171 | port = find_port_by_vtermno(vtermno); |
1172 | if (!port) | |
6dc69f97 | 1173 | return -EPIPE; |
21206ede | 1174 | |
31610434 | 1175 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 1176 | BUG_ON(!port->in_vq); |
31610434 | 1177 | |
48b36066 | 1178 | return fill_readbuf(port, (__force char __user *)buf, count, false); |
31610434 | 1179 | } |
31610434 | 1180 | |
cb06e367 | 1181 | static void resize_console(struct port *port) |
c2983458 | 1182 | { |
cb06e367 | 1183 | struct virtio_device *vdev; |
c2983458 | 1184 | |
2de16a49 | 1185 | /* The port could have been hot-unplugged */ |
9778829c | 1186 | if (!port || !is_console_port(port)) |
2de16a49 AS |
1187 | return; |
1188 | ||
cb06e367 | 1189 | vdev = port->portdev->vdev; |
1b637046 SB |
1190 | |
1191 | /* Don't test F_SIZE at all if we're rproc: not a valid feature! */ | |
1192 | if (!is_rproc_serial(vdev) && | |
1193 | virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) | |
9778829c | 1194 | hvc_resize(port->cons.hvc, port->cons.ws); |
c2983458 CB |
1195 | } |
1196 | ||
38edf58d | 1197 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
1198 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
1199 | { | |
38edf58d AS |
1200 | struct port *port; |
1201 | ||
1202 | port = find_port_by_vtermno(hp->vtermno); | |
1203 | if (!port) | |
1204 | return -EINVAL; | |
1205 | ||
91fcad19 | 1206 | hp->irq_requested = 1; |
cb06e367 | 1207 | resize_console(port); |
c2983458 | 1208 | |
91fcad19 CB |
1209 | return 0; |
1210 | } | |
1211 | ||
1212 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
1213 | { | |
1214 | hp->irq_requested = 0; | |
1215 | } | |
1216 | ||
17634ba2 | 1217 | /* The operations for console ports. */ |
1dff3996 | 1218 | static const struct hv_ops hv_ops = { |
971f3390 RR |
1219 | .get_chars = get_chars, |
1220 | .put_chars = put_chars, | |
1221 | .notifier_add = notifier_add_vio, | |
1222 | .notifier_del = notifier_del_vio, | |
1223 | .notifier_hangup = notifier_del_vio, | |
1224 | }; | |
1225 | ||
1226 | /* | |
1227 | * Console drivers are initialized very early so boot messages can go | |
1228 | * out, so we do things slightly differently from the generic virtio | |
1229 | * initialization of the net and block drivers. | |
1230 | * | |
1231 | * At this stage, the console is output-only. It's too early to set | |
1232 | * up a virtqueue, so we let the drivers do some boutique early-output | |
1233 | * thing. | |
1234 | */ | |
1235 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
1236 | { | |
1237 | early_put_chars = put_chars; | |
1238 | return hvc_instantiate(0, 0, &hv_ops); | |
1239 | } | |
1240 | ||
3826835a | 1241 | static int init_port_console(struct port *port) |
cfa6d379 AS |
1242 | { |
1243 | int ret; | |
1244 | ||
1245 | /* | |
1246 | * The Host's telling us this port is a console port. Hook it | |
1247 | * up with an hvc console. | |
1248 | * | |
1249 | * To set up and manage our virtual console, we call | |
1250 | * hvc_alloc(). | |
1251 | * | |
1252 | * The first argument of hvc_alloc() is the virtual console | |
1253 | * number. The second argument is the parameter for the | |
1254 | * notification mechanism (like irq number). We currently | |
1255 | * leave this as zero, virtqueues have implicit notifications. | |
1256 | * | |
1257 | * The third argument is a "struct hv_ops" containing the | |
1258 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
1259 | * pointers. The final argument is the output buffer size: we | |
1260 | * can do any size, so we put PAGE_SIZE here. | |
1261 | */ | |
1262 | port->cons.vtermno = pdrvdata.next_vtermno; | |
1263 | ||
1264 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
1265 | if (IS_ERR(port->cons.hvc)) { | |
1266 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
1267 | dev_err(port->dev, |
1268 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
1269 | port->cons.hvc = NULL; |
1270 | return ret; | |
1271 | } | |
1272 | spin_lock_irq(&pdrvdata_lock); | |
1273 | pdrvdata.next_vtermno++; | |
1274 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
1275 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 1276 | port->guest_connected = true; |
cfa6d379 | 1277 | |
1d05160b AS |
1278 | /* |
1279 | * Start using the new console output if this is the first | |
1280 | * console to come up. | |
1281 | */ | |
1282 | if (early_put_chars) | |
1283 | early_put_chars = NULL; | |
1284 | ||
2030fa49 AS |
1285 | /* Notify host of port being opened */ |
1286 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1287 | ||
cfa6d379 AS |
1288 | return 0; |
1289 | } | |
1290 | ||
431edb8a AS |
1291 | static ssize_t show_port_name(struct device *dev, |
1292 | struct device_attribute *attr, char *buffer) | |
1293 | { | |
1294 | struct port *port; | |
1295 | ||
1296 | port = dev_get_drvdata(dev); | |
1297 | ||
1298 | return sprintf(buffer, "%s\n", port->name); | |
1299 | } | |
1300 | ||
1301 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
1302 | ||
1303 | static struct attribute *port_sysfs_entries[] = { | |
1304 | &dev_attr_name.attr, | |
1305 | NULL | |
1306 | }; | |
1307 | ||
ac317e27 | 1308 | static const struct attribute_group port_attribute_group = { |
431edb8a AS |
1309 | .name = NULL, /* put in device directory */ |
1310 | .attrs = port_sysfs_entries, | |
1311 | }; | |
1312 | ||
d99393ef AS |
1313 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, |
1314 | size_t count, loff_t *offp) | |
1315 | { | |
1316 | struct port *port; | |
1317 | char *buf; | |
1318 | ssize_t ret, out_offset, out_count; | |
1319 | ||
1320 | out_count = 1024; | |
1321 | buf = kmalloc(out_count, GFP_KERNEL); | |
1322 | if (!buf) | |
1323 | return -ENOMEM; | |
1324 | ||
1325 | port = filp->private_data; | |
1326 | out_offset = 0; | |
1327 | out_offset += snprintf(buf + out_offset, out_count, | |
1328 | "name: %s\n", port->name ? port->name : ""); | |
1329 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1330 | "guest_connected: %d\n", port->guest_connected); | |
1331 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1332 | "host_connected: %d\n", port->host_connected); | |
cdfadfc1 AS |
1333 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1334 | "outvq_full: %d\n", port->outvq_full); | |
17e5b4f2 AS |
1335 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1336 | "bytes_sent: %lu\n", port->stats.bytes_sent); | |
1337 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1338 | "bytes_received: %lu\n", | |
1339 | port->stats.bytes_received); | |
1340 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1341 | "bytes_discarded: %lu\n", | |
1342 | port->stats.bytes_discarded); | |
d99393ef AS |
1343 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1344 | "is_console: %s\n", | |
1345 | is_console_port(port) ? "yes" : "no"); | |
1346 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1347 | "console_vtermno: %u\n", port->cons.vtermno); | |
1348 | ||
1349 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
1350 | kfree(buf); | |
1351 | return ret; | |
1352 | } | |
1353 | ||
1354 | static const struct file_operations port_debugfs_ops = { | |
1355 | .owner = THIS_MODULE, | |
234e3405 | 1356 | .open = simple_open, |
d99393ef AS |
1357 | .read = debugfs_read, |
1358 | }; | |
1359 | ||
9778829c AS |
1360 | static void set_console_size(struct port *port, u16 rows, u16 cols) |
1361 | { | |
1362 | if (!port || !is_console_port(port)) | |
1363 | return; | |
1364 | ||
1365 | port->cons.ws.ws_row = rows; | |
1366 | port->cons.ws.ws_col = cols; | |
1367 | } | |
1368 | ||
c446f8fc AS |
1369 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
1370 | { | |
1371 | struct port_buffer *buf; | |
1372 | unsigned int nr_added_bufs; | |
1373 | int ret; | |
1374 | ||
1375 | nr_added_bufs = 0; | |
1376 | do { | |
276a3e95 | 1377 | buf = alloc_buf(vq, PAGE_SIZE, 0); |
c446f8fc AS |
1378 | if (!buf) |
1379 | break; | |
1380 | ||
1381 | spin_lock_irq(lock); | |
1382 | ret = add_inbuf(vq, buf); | |
1383 | if (ret < 0) { | |
1384 | spin_unlock_irq(lock); | |
1b637046 | 1385 | free_buf(buf, true); |
c446f8fc AS |
1386 | break; |
1387 | } | |
1388 | nr_added_bufs++; | |
1389 | spin_unlock_irq(lock); | |
1390 | } while (ret > 0); | |
1391 | ||
1392 | return nr_added_bufs; | |
1393 | } | |
1394 | ||
3eae0ade AS |
1395 | static void send_sigio_to_port(struct port *port) |
1396 | { | |
1397 | if (port->async_queue && port->guest_connected) | |
1398 | kill_fasync(&port->async_queue, SIGIO, POLL_OUT); | |
1399 | } | |
1400 | ||
c446f8fc AS |
1401 | static int add_port(struct ports_device *portdev, u32 id) |
1402 | { | |
1403 | char debugfs_name[16]; | |
1404 | struct port *port; | |
1405 | struct port_buffer *buf; | |
1406 | dev_t devt; | |
1407 | unsigned int nr_added_bufs; | |
1408 | int err; | |
1409 | ||
1410 | port = kmalloc(sizeof(*port), GFP_KERNEL); | |
1411 | if (!port) { | |
1412 | err = -ENOMEM; | |
1413 | goto fail; | |
1414 | } | |
b353a6b8 | 1415 | kref_init(&port->kref); |
c446f8fc AS |
1416 | |
1417 | port->portdev = portdev; | |
1418 | port->id = id; | |
1419 | ||
1420 | port->name = NULL; | |
1421 | port->inbuf = NULL; | |
1422 | port->cons.hvc = NULL; | |
3eae0ade | 1423 | port->async_queue = NULL; |
c446f8fc | 1424 | |
9778829c AS |
1425 | port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
1426 | ||
c446f8fc | 1427 | port->host_connected = port->guest_connected = false; |
17e5b4f2 | 1428 | port->stats = (struct port_stats) { 0 }; |
c446f8fc | 1429 | |
cdfadfc1 AS |
1430 | port->outvq_full = false; |
1431 | ||
c446f8fc AS |
1432 | port->in_vq = portdev->in_vqs[port->id]; |
1433 | port->out_vq = portdev->out_vqs[port->id]; | |
1434 | ||
d22a6989 AS |
1435 | port->cdev = cdev_alloc(); |
1436 | if (!port->cdev) { | |
1437 | dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); | |
1438 | err = -ENOMEM; | |
1439 | goto free_port; | |
1440 | } | |
1441 | port->cdev->ops = &port_fops; | |
c446f8fc AS |
1442 | |
1443 | devt = MKDEV(portdev->chr_major, id); | |
d22a6989 | 1444 | err = cdev_add(port->cdev, devt, 1); |
c446f8fc AS |
1445 | if (err < 0) { |
1446 | dev_err(&port->portdev->vdev->dev, | |
1447 | "Error %d adding cdev for port %u\n", err, id); | |
d22a6989 | 1448 | goto free_cdev; |
c446f8fc AS |
1449 | } |
1450 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1451 | devt, port, "vport%up%u", | |
dc18f080 | 1452 | port->portdev->vdev->index, id); |
c446f8fc AS |
1453 | if (IS_ERR(port->dev)) { |
1454 | err = PTR_ERR(port->dev); | |
1455 | dev_err(&port->portdev->vdev->dev, | |
1456 | "Error %d creating device for port %u\n", | |
1457 | err, id); | |
1458 | goto free_cdev; | |
1459 | } | |
1460 | ||
1461 | spin_lock_init(&port->inbuf_lock); | |
cdfadfc1 | 1462 | spin_lock_init(&port->outvq_lock); |
c446f8fc AS |
1463 | init_waitqueue_head(&port->waitqueue); |
1464 | ||
1465 | /* Fill the in_vq with buffers so the host can send us data. */ | |
1466 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); | |
1467 | if (!nr_added_bufs) { | |
1468 | dev_err(port->dev, "Error allocating inbufs\n"); | |
1469 | err = -ENOMEM; | |
1470 | goto free_device; | |
1471 | } | |
1472 | ||
1b637046 SB |
1473 | if (is_rproc_serial(port->portdev->vdev)) |
1474 | /* | |
1475 | * For rproc_serial assume remote processor is connected. | |
1476 | * rproc_serial does not want the console port, only | |
1477 | * the generic port implementation. | |
1478 | */ | |
aabd6a8f | 1479 | port->host_connected = true; |
1b637046 SB |
1480 | else if (!use_multiport(port->portdev)) { |
1481 | /* | |
1482 | * If we're not using multiport support, | |
1483 | * this has to be a console port. | |
1484 | */ | |
c446f8fc AS |
1485 | err = init_port_console(port); |
1486 | if (err) | |
1487 | goto free_inbufs; | |
1488 | } | |
1489 | ||
1490 | spin_lock_irq(&portdev->ports_lock); | |
1491 | list_add_tail(&port->list, &port->portdev->ports); | |
1492 | spin_unlock_irq(&portdev->ports_lock); | |
1493 | ||
1494 | /* | |
1495 | * Tell the Host we're set so that it can send us various | |
1496 | * configuration parameters for this port (eg, port name, | |
1497 | * caching, whether this is a console port, etc.) | |
1498 | */ | |
1499 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
1500 | ||
1501 | if (pdrvdata.debugfs_dir) { | |
1502 | /* | |
1503 | * Finally, create the debugfs file that we can use to | |
1504 | * inspect a port's state at any time | |
1505 | */ | |
db170068 DC |
1506 | snprintf(debugfs_name, sizeof(debugfs_name), "vport%up%u", |
1507 | port->portdev->vdev->index, id); | |
c446f8fc AS |
1508 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, |
1509 | pdrvdata.debugfs_dir, | |
1510 | port, | |
1511 | &port_debugfs_ops); | |
1512 | } | |
1513 | return 0; | |
1514 | ||
1515 | free_inbufs: | |
1516 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1b637046 | 1517 | free_buf(buf, true); |
c446f8fc AS |
1518 | free_device: |
1519 | device_destroy(pdrvdata.class, port->dev->devt); | |
1520 | free_cdev: | |
d22a6989 | 1521 | cdev_del(port->cdev); |
c446f8fc AS |
1522 | free_port: |
1523 | kfree(port); | |
1524 | fail: | |
1525 | /* The host might want to notify management sw about port add failure */ | |
0643e4c6 | 1526 | __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
c446f8fc AS |
1527 | return err; |
1528 | } | |
1529 | ||
b353a6b8 AS |
1530 | /* No users remain, remove all port-specific data. */ |
1531 | static void remove_port(struct kref *kref) | |
1532 | { | |
1533 | struct port *port; | |
1534 | ||
1535 | port = container_of(kref, struct port, kref); | |
1536 | ||
b353a6b8 AS |
1537 | kfree(port); |
1538 | } | |
1539 | ||
a0e2dbfc AS |
1540 | static void remove_port_data(struct port *port) |
1541 | { | |
1542 | struct port_buffer *buf; | |
1543 | ||
c6017e79 | 1544 | spin_lock_irq(&port->inbuf_lock); |
a0e2dbfc AS |
1545 | /* Remove unused data this port might have received. */ |
1546 | discard_port_data(port); | |
34563769 | 1547 | spin_unlock_irq(&port->inbuf_lock); |
a0e2dbfc | 1548 | |
a0e2dbfc | 1549 | /* Remove buffers we queued up for the Host to send us data in. */ |
34563769 MR |
1550 | do { |
1551 | spin_lock_irq(&port->inbuf_lock); | |
1552 | buf = virtqueue_detach_unused_buf(port->in_vq); | |
1553 | spin_unlock_irq(&port->inbuf_lock); | |
1554 | if (buf) | |
1555 | free_buf(buf, true); | |
1556 | } while (buf); | |
c6017e79 AS |
1557 | |
1558 | spin_lock_irq(&port->outvq_lock); | |
1559 | reclaim_consumed_buffers(port); | |
34563769 | 1560 | spin_unlock_irq(&port->outvq_lock); |
eb34f12b | 1561 | |
1562 | /* Free pending buffers from the out-queue. */ | |
34563769 MR |
1563 | do { |
1564 | spin_lock_irq(&port->outvq_lock); | |
1565 | buf = virtqueue_detach_unused_buf(port->out_vq); | |
1566 | spin_unlock_irq(&port->outvq_lock); | |
1567 | if (buf) | |
1568 | free_buf(buf, true); | |
1569 | } while (buf); | |
a0e2dbfc AS |
1570 | } |
1571 | ||
b353a6b8 AS |
1572 | /* |
1573 | * Port got unplugged. Remove port from portdev's list and drop the | |
1574 | * kref reference. If no userspace has this port opened, it will | |
1575 | * result in immediate removal the port. | |
1576 | */ | |
1577 | static void unplug_port(struct port *port) | |
1f7aa42d | 1578 | { |
b353a6b8 AS |
1579 | spin_lock_irq(&port->portdev->ports_lock); |
1580 | list_del(&port->list); | |
1581 | spin_unlock_irq(&port->portdev->ports_lock); | |
1582 | ||
5549fb25 | 1583 | spin_lock_irq(&port->inbuf_lock); |
0047634d | 1584 | if (port->guest_connected) { |
92d34538 AS |
1585 | /* Let the app know the port is going down. */ |
1586 | send_sigio_to_port(port); | |
1587 | ||
1588 | /* Do this after sigio is actually sent */ | |
0047634d AS |
1589 | port->guest_connected = false; |
1590 | port->host_connected = false; | |
a461e11e | 1591 | |
92d34538 | 1592 | wake_up_interruptible(&port->waitqueue); |
0047634d | 1593 | } |
5549fb25 | 1594 | spin_unlock_irq(&port->inbuf_lock); |
0047634d | 1595 | |
1f7aa42d AS |
1596 | if (is_console_port(port)) { |
1597 | spin_lock_irq(&pdrvdata_lock); | |
1598 | list_del(&port->cons.list); | |
1599 | spin_unlock_irq(&pdrvdata_lock); | |
1600 | hvc_remove(port->cons.hvc); | |
1601 | } | |
1f7aa42d | 1602 | |
a0e2dbfc | 1603 | remove_port_data(port); |
a9cdd485 | 1604 | |
b353a6b8 AS |
1605 | /* |
1606 | * We should just assume the device itself has gone off -- | |
1607 | * else a close on an open port later will try to send out a | |
1608 | * control message. | |
1609 | */ | |
1610 | port->portdev = NULL; | |
d99393ef | 1611 | |
ea3768b4 AS |
1612 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); |
1613 | device_destroy(pdrvdata.class, port->dev->devt); | |
1614 | cdev_del(port->cdev); | |
1615 | ||
ea3768b4 | 1616 | debugfs_remove(port->debugfs_file); |
3b868a40 | 1617 | kfree(port->name); |
ea3768b4 | 1618 | |
b353a6b8 AS |
1619 | /* |
1620 | * Locks around here are not necessary - a port can't be | |
1621 | * opened after we removed the port struct from ports_list | |
1622 | * above. | |
1623 | */ | |
1624 | kref_put(&port->kref, remove_port); | |
1f7aa42d AS |
1625 | } |
1626 | ||
17634ba2 | 1627 | /* Any private messages that the Host and Guest want to share */ |
1f0f9106 MT |
1628 | static void handle_control_message(struct virtio_device *vdev, |
1629 | struct ports_device *portdev, | |
17634ba2 AS |
1630 | struct port_buffer *buf) |
1631 | { | |
1632 | struct virtio_console_control *cpkt; | |
1633 | struct port *port; | |
431edb8a AS |
1634 | size_t name_size; |
1635 | int err; | |
17634ba2 AS |
1636 | |
1637 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
1638 | ||
1f0f9106 MT |
1639 | port = find_port_by_id(portdev, virtio32_to_cpu(vdev, cpkt->id)); |
1640 | if (!port && | |
1641 | cpkt->event != cpu_to_virtio16(vdev, VIRTIO_CONSOLE_PORT_ADD)) { | |
17634ba2 AS |
1642 | /* No valid header at start of buffer. Drop it. */ |
1643 | dev_dbg(&portdev->vdev->dev, | |
1644 | "Invalid index %u in control packet\n", cpkt->id); | |
1645 | return; | |
1646 | } | |
1647 | ||
1f0f9106 | 1648 | switch (virtio16_to_cpu(vdev, cpkt->event)) { |
f909f850 AS |
1649 | case VIRTIO_CONSOLE_PORT_ADD: |
1650 | if (port) { | |
1d05160b AS |
1651 | dev_dbg(&portdev->vdev->dev, |
1652 | "Port %u already added\n", port->id); | |
f909f850 AS |
1653 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
1654 | break; | |
1655 | } | |
1f0f9106 | 1656 | if (virtio32_to_cpu(vdev, cpkt->id) >= |
7328fa64 | 1657 | portdev->max_nr_ports) { |
f909f850 | 1658 | dev_warn(&portdev->vdev->dev, |
1f0f9106 MT |
1659 | "Request for adding port with " |
1660 | "out-of-bound id %u, max. supported id: %u\n", | |
7328fa64 | 1661 | cpkt->id, portdev->max_nr_ports - 1); |
f909f850 AS |
1662 | break; |
1663 | } | |
1f0f9106 | 1664 | add_port(portdev, virtio32_to_cpu(vdev, cpkt->id)); |
f909f850 AS |
1665 | break; |
1666 | case VIRTIO_CONSOLE_PORT_REMOVE: | |
b353a6b8 | 1667 | unplug_port(port); |
f909f850 | 1668 | break; |
17634ba2 AS |
1669 | case VIRTIO_CONSOLE_CONSOLE_PORT: |
1670 | if (!cpkt->value) | |
1671 | break; | |
1672 | if (is_console_port(port)) | |
1673 | break; | |
1674 | ||
1675 | init_port_console(port); | |
5e38483b | 1676 | complete(&early_console_added); |
17634ba2 AS |
1677 | /* |
1678 | * Could remove the port here in case init fails - but | |
1679 | * have to notify the host first. | |
1680 | */ | |
1681 | break; | |
8345adbf AS |
1682 | case VIRTIO_CONSOLE_RESIZE: { |
1683 | struct { | |
1684 | __u16 rows; | |
1685 | __u16 cols; | |
1686 | } size; | |
1687 | ||
17634ba2 AS |
1688 | if (!is_console_port(port)) |
1689 | break; | |
8345adbf AS |
1690 | |
1691 | memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), | |
1692 | sizeof(size)); | |
1693 | set_console_size(port, size.rows, size.cols); | |
1694 | ||
17634ba2 AS |
1695 | port->cons.hvc->irq_requested = 1; |
1696 | resize_console(port); | |
1697 | break; | |
8345adbf | 1698 | } |
2030fa49 | 1699 | case VIRTIO_CONSOLE_PORT_OPEN: |
1f0f9106 | 1700 | port->host_connected = virtio16_to_cpu(vdev, cpkt->value); |
2030fa49 | 1701 | wake_up_interruptible(&port->waitqueue); |
cdfadfc1 AS |
1702 | /* |
1703 | * If the host port got closed and the host had any | |
1704 | * unconsumed buffers, we'll be able to reclaim them | |
1705 | * now. | |
1706 | */ | |
1707 | spin_lock_irq(&port->outvq_lock); | |
1708 | reclaim_consumed_buffers(port); | |
1709 | spin_unlock_irq(&port->outvq_lock); | |
3eae0ade AS |
1710 | |
1711 | /* | |
1712 | * If the guest is connected, it'll be interested in | |
1713 | * knowing the host connection state changed. | |
1714 | */ | |
314081f1 | 1715 | spin_lock_irq(&port->inbuf_lock); |
3eae0ade | 1716 | send_sigio_to_port(port); |
314081f1 | 1717 | spin_unlock_irq(&port->inbuf_lock); |
2030fa49 | 1718 | break; |
431edb8a | 1719 | case VIRTIO_CONSOLE_PORT_NAME: |
291024ef AS |
1720 | /* |
1721 | * If we woke up after hibernation, we can get this | |
1722 | * again. Skip it in that case. | |
1723 | */ | |
1724 | if (port->name) | |
1725 | break; | |
1726 | ||
431edb8a AS |
1727 | /* |
1728 | * Skip the size of the header and the cpkt to get the size | |
1729 | * of the name that was sent | |
1730 | */ | |
1731 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
1732 | ||
1733 | port->name = kmalloc(name_size, GFP_KERNEL); | |
1734 | if (!port->name) { | |
1735 | dev_err(port->dev, | |
1736 | "Not enough space to store port name\n"); | |
1737 | break; | |
1738 | } | |
1739 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
1740 | name_size - 1); | |
1741 | port->name[name_size - 1] = 0; | |
1742 | ||
1743 | /* | |
1744 | * Since we only have one sysfs attribute, 'name', | |
1745 | * create it only if we have a name for the port. | |
1746 | */ | |
1747 | err = sysfs_create_group(&port->dev->kobj, | |
1748 | &port_attribute_group); | |
ec64213c | 1749 | if (err) { |
431edb8a AS |
1750 | dev_err(port->dev, |
1751 | "Error %d creating sysfs device attributes\n", | |
1752 | err); | |
ec64213c AS |
1753 | } else { |
1754 | /* | |
1755 | * Generate a udev event so that appropriate | |
1756 | * symlinks can be created based on udev | |
1757 | * rules. | |
1758 | */ | |
1759 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
1760 | } | |
431edb8a | 1761 | break; |
17634ba2 AS |
1762 | } |
1763 | } | |
1764 | ||
1765 | static void control_work_handler(struct work_struct *work) | |
1766 | { | |
1767 | struct ports_device *portdev; | |
1768 | struct virtqueue *vq; | |
1769 | struct port_buffer *buf; | |
1770 | unsigned int len; | |
1771 | ||
1772 | portdev = container_of(work, struct ports_device, control_work); | |
1773 | vq = portdev->c_ivq; | |
1774 | ||
165b1b8b | 1775 | spin_lock(&portdev->c_ivq_lock); |
505b0451 | 1776 | while ((buf = virtqueue_get_buf(vq, &len))) { |
165b1b8b | 1777 | spin_unlock(&portdev->c_ivq_lock); |
17634ba2 AS |
1778 | |
1779 | buf->len = len; | |
1780 | buf->offset = 0; | |
1781 | ||
1f0f9106 | 1782 | handle_control_message(vq->vdev, portdev, buf); |
17634ba2 | 1783 | |
165b1b8b | 1784 | spin_lock(&portdev->c_ivq_lock); |
17634ba2 AS |
1785 | if (add_inbuf(portdev->c_ivq, buf) < 0) { |
1786 | dev_warn(&portdev->vdev->dev, | |
1787 | "Error adding buffer to queue\n"); | |
1b637046 | 1788 | free_buf(buf, false); |
17634ba2 AS |
1789 | } |
1790 | } | |
165b1b8b | 1791 | spin_unlock(&portdev->c_ivq_lock); |
17634ba2 AS |
1792 | } |
1793 | ||
2770c5ea AS |
1794 | static void out_intr(struct virtqueue *vq) |
1795 | { | |
1796 | struct port *port; | |
1797 | ||
1798 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1799 | if (!port) | |
1800 | return; | |
1801 | ||
1802 | wake_up_interruptible(&port->waitqueue); | |
1803 | } | |
1804 | ||
17634ba2 AS |
1805 | static void in_intr(struct virtqueue *vq) |
1806 | { | |
1807 | struct port *port; | |
1808 | unsigned long flags; | |
1809 | ||
1810 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1811 | if (!port) | |
1812 | return; | |
1813 | ||
1814 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d25a9dda | 1815 | port->inbuf = get_inbuf(port); |
17634ba2 | 1816 | |
88f251ac | 1817 | /* |
aabd6a8f SB |
1818 | * Normally the port should not accept data when the port is |
1819 | * closed. For generic serial ports, the host won't (shouldn't) | |
1820 | * send data till the guest is connected. But this condition | |
88f251ac | 1821 | * can be reached when a console port is not yet connected (no |
aabd6a8f SB |
1822 | * tty is spawned) and the other side sends out data over the |
1823 | * vring, or when a remote devices start sending data before | |
1824 | * the ports are opened. | |
1825 | * | |
1826 | * A generic serial port will discard data if not connected, | |
1827 | * while console ports and rproc-serial ports accepts data at | |
1828 | * any time. rproc-serial is initiated with guest_connected to | |
1829 | * false because port_fops_open expects this. Console ports are | |
1830 | * hooked up with an HVC console and is initialized with | |
1831 | * guest_connected to true. | |
88f251ac | 1832 | */ |
aabd6a8f SB |
1833 | |
1834 | if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev)) | |
88f251ac AS |
1835 | discard_port_data(port); |
1836 | ||
314081f1 AS |
1837 | /* Send a SIGIO indicating new data in case the process asked for it */ |
1838 | send_sigio_to_port(port); | |
1839 | ||
17634ba2 AS |
1840 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1841 | ||
2030fa49 AS |
1842 | wake_up_interruptible(&port->waitqueue); |
1843 | ||
17634ba2 AS |
1844 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1845 | hvc_kick(); | |
1846 | } | |
1847 | ||
1848 | static void control_intr(struct virtqueue *vq) | |
1849 | { | |
1850 | struct ports_device *portdev; | |
1851 | ||
1852 | portdev = vq->vdev->priv; | |
1853 | schedule_work(&portdev->control_work); | |
1854 | } | |
1855 | ||
7f5d810d AS |
1856 | static void config_intr(struct virtio_device *vdev) |
1857 | { | |
1858 | struct ports_device *portdev; | |
1859 | ||
1860 | portdev = vdev->priv; | |
99f905f8 | 1861 | |
eeb8a7e8 MT |
1862 | if (!use_multiport(portdev)) |
1863 | schedule_work(&portdev->config_work); | |
1864 | } | |
1865 | ||
1866 | static void config_work_handler(struct work_struct *work) | |
1867 | { | |
1868 | struct ports_device *portdev; | |
1869 | ||
8379cadf | 1870 | portdev = container_of(work, struct ports_device, config_work); |
4038f5b7 | 1871 | if (!use_multiport(portdev)) { |
eeb8a7e8 | 1872 | struct virtio_device *vdev; |
9778829c AS |
1873 | struct port *port; |
1874 | u16 rows, cols; | |
1875 | ||
eeb8a7e8 | 1876 | vdev = portdev->vdev; |
855e0c52 RR |
1877 | virtio_cread(vdev, struct virtio_console_config, cols, &cols); |
1878 | virtio_cread(vdev, struct virtio_console_config, rows, &rows); | |
9778829c AS |
1879 | |
1880 | port = find_port_by_id(portdev, 0); | |
1881 | set_console_size(port, rows, cols); | |
1882 | ||
4038f5b7 AS |
1883 | /* |
1884 | * We'll use this way of resizing only for legacy | |
1885 | * support. For newer userspace | |
1886 | * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages | |
1887 | * to indicate console size changes so that it can be | |
1888 | * done per-port. | |
1889 | */ | |
9778829c | 1890 | resize_console(port); |
4038f5b7 | 1891 | } |
7f5d810d AS |
1892 | } |
1893 | ||
2658a79a AS |
1894 | static int init_vqs(struct ports_device *portdev) |
1895 | { | |
1896 | vq_callback_t **io_callbacks; | |
1897 | char **io_names; | |
1898 | struct virtqueue **vqs; | |
17634ba2 | 1899 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1900 | int err; |
1901 | ||
7328fa64 | 1902 | nr_ports = portdev->max_nr_ports; |
17634ba2 | 1903 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; |
2658a79a AS |
1904 | |
1905 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
2658a79a | 1906 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); |
2658a79a | 1907 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); |
2658a79a AS |
1908 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1909 | GFP_KERNEL); | |
2658a79a AS |
1910 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1911 | GFP_KERNEL); | |
22e132ff | 1912 | if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || |
286f9a22 | 1913 | !portdev->out_vqs) { |
2658a79a | 1914 | err = -ENOMEM; |
22e132ff | 1915 | goto free; |
2658a79a AS |
1916 | } |
1917 | ||
17634ba2 AS |
1918 | /* |
1919 | * For backward compat (newer host but older guest), the host | |
1920 | * spawns a console port first and also inits the vqs for port | |
1921 | * 0 before others. | |
1922 | */ | |
1923 | j = 0; | |
1924 | io_callbacks[j] = in_intr; | |
2770c5ea | 1925 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1926 | io_names[j] = "input"; |
1927 | io_names[j + 1] = "output"; | |
1928 | j += 2; | |
1929 | ||
1930 | if (use_multiport(portdev)) { | |
1931 | io_callbacks[j] = control_intr; | |
1932 | io_callbacks[j + 1] = NULL; | |
1933 | io_names[j] = "control-i"; | |
1934 | io_names[j + 1] = "control-o"; | |
1935 | ||
1936 | for (i = 1; i < nr_ports; i++) { | |
1937 | j += 2; | |
1938 | io_callbacks[j] = in_intr; | |
2770c5ea | 1939 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1940 | io_names[j] = "input"; |
1941 | io_names[j + 1] = "output"; | |
1942 | } | |
1943 | } | |
2658a79a | 1944 | /* Find the queues. */ |
9b2bbdb2 MT |
1945 | err = virtio_find_vqs(portdev->vdev, nr_queues, vqs, |
1946 | io_callbacks, | |
1947 | (const char **)io_names, NULL); | |
2658a79a | 1948 | if (err) |
22e132ff | 1949 | goto free; |
2658a79a | 1950 | |
17634ba2 | 1951 | j = 0; |
2658a79a AS |
1952 | portdev->in_vqs[0] = vqs[0]; |
1953 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1954 | j += 2; |
1955 | if (use_multiport(portdev)) { | |
1956 | portdev->c_ivq = vqs[j]; | |
1957 | portdev->c_ovq = vqs[j + 1]; | |
1958 | ||
1959 | for (i = 1; i < nr_ports; i++) { | |
1960 | j += 2; | |
1961 | portdev->in_vqs[i] = vqs[j]; | |
1962 | portdev->out_vqs[i] = vqs[j + 1]; | |
1963 | } | |
1964 | } | |
2658a79a | 1965 | kfree(io_names); |
22e132ff | 1966 | kfree(io_callbacks); |
2658a79a AS |
1967 | kfree(vqs); |
1968 | ||
1969 | return 0; | |
1970 | ||
22e132ff | 1971 | free: |
2658a79a | 1972 | kfree(portdev->out_vqs); |
2658a79a | 1973 | kfree(portdev->in_vqs); |
22e132ff JS |
1974 | kfree(io_names); |
1975 | kfree(io_callbacks); | |
2658a79a | 1976 | kfree(vqs); |
22e132ff | 1977 | |
2658a79a AS |
1978 | return err; |
1979 | } | |
1980 | ||
fb08bd27 AS |
1981 | static const struct file_operations portdev_fops = { |
1982 | .owner = THIS_MODULE, | |
1983 | }; | |
1984 | ||
a0e2dbfc AS |
1985 | static void remove_vqs(struct ports_device *portdev) |
1986 | { | |
1987 | portdev->vdev->config->del_vqs(portdev->vdev); | |
1988 | kfree(portdev->in_vqs); | |
1989 | kfree(portdev->out_vqs); | |
1990 | } | |
1991 | ||
1992 | static void remove_controlq_data(struct ports_device *portdev) | |
1993 | { | |
1994 | struct port_buffer *buf; | |
1995 | unsigned int len; | |
1996 | ||
1997 | if (!use_multiport(portdev)) | |
1998 | return; | |
1999 | ||
2000 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) | |
1b637046 | 2001 | free_buf(buf, true); |
a0e2dbfc AS |
2002 | |
2003 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) | |
1b637046 | 2004 | free_buf(buf, true); |
a0e2dbfc AS |
2005 | } |
2006 | ||
1c85bf35 AS |
2007 | /* |
2008 | * Once we're further in boot, we get probed like any other virtio | |
2009 | * device. | |
17634ba2 AS |
2010 | * |
2011 | * If the host also supports multiple console ports, we check the | |
2012 | * config space to see how many ports the host has spawned. We | |
2013 | * initialize each port found. | |
1c85bf35 | 2014 | */ |
2223cbec | 2015 | static int virtcons_probe(struct virtio_device *vdev) |
1c85bf35 | 2016 | { |
1c85bf35 AS |
2017 | struct ports_device *portdev; |
2018 | int err; | |
17634ba2 | 2019 | bool multiport; |
5e38483b CB |
2020 | bool early = early_put_chars != NULL; |
2021 | ||
be8ff595 RR |
2022 | /* We only need a config space if features are offered */ |
2023 | if (!vdev->config->get && | |
2024 | (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE) | |
2025 | || virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT))) { | |
011f0e7a MT |
2026 | dev_err(&vdev->dev, "%s failure: config access disabled\n", |
2027 | __func__); | |
2028 | return -EINVAL; | |
2029 | } | |
2030 | ||
5e38483b CB |
2031 | /* Ensure to read early_put_chars now */ |
2032 | barrier(); | |
1c85bf35 AS |
2033 | |
2034 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
2035 | if (!portdev) { | |
2036 | err = -ENOMEM; | |
2037 | goto fail; | |
2038 | } | |
2039 | ||
2040 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
2041 | portdev->vdev = vdev; | |
2042 | vdev->priv = portdev; | |
2043 | ||
fb08bd27 AS |
2044 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", |
2045 | &portdev_fops); | |
2046 | if (portdev->chr_major < 0) { | |
2047 | dev_err(&vdev->dev, | |
2048 | "Error %d registering chrdev for device %u\n", | |
dc18f080 | 2049 | portdev->chr_major, vdev->index); |
fb08bd27 AS |
2050 | err = portdev->chr_major; |
2051 | goto free; | |
2052 | } | |
2053 | ||
17634ba2 | 2054 | multiport = false; |
7328fa64 | 2055 | portdev->max_nr_ports = 1; |
1b637046 SB |
2056 | |
2057 | /* Don't test MULTIPORT at all if we're rproc: not a valid feature! */ | |
2058 | if (!is_rproc_serial(vdev) && | |
855e0c52 RR |
2059 | virtio_cread_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT, |
2060 | struct virtio_console_config, max_nr_ports, | |
7328fa64 | 2061 | &portdev->max_nr_ports) == 0) { |
17634ba2 | 2062 | multiport = true; |
1b637046 | 2063 | } |
17634ba2 | 2064 | |
2658a79a AS |
2065 | err = init_vqs(portdev); |
2066 | if (err < 0) { | |
2067 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 2068 | goto free_chrdev; |
2658a79a | 2069 | } |
1c85bf35 | 2070 | |
17634ba2 AS |
2071 | spin_lock_init(&portdev->ports_lock); |
2072 | INIT_LIST_HEAD(&portdev->ports); | |
2073 | ||
65eca3a2 CH |
2074 | virtio_device_ready(portdev->vdev); |
2075 | ||
eeb8a7e8 | 2076 | INIT_WORK(&portdev->config_work, &config_work_handler); |
4f6e24ed MT |
2077 | INIT_WORK(&portdev->control_work, &control_work_handler); |
2078 | ||
17634ba2 | 2079 | if (multiport) { |
335a64a5 AS |
2080 | unsigned int nr_added_bufs; |
2081 | ||
165b1b8b | 2082 | spin_lock_init(&portdev->c_ivq_lock); |
9ba5c80b | 2083 | spin_lock_init(&portdev->c_ovq_lock); |
17634ba2 | 2084 | |
165b1b8b AS |
2085 | nr_added_bufs = fill_queue(portdev->c_ivq, |
2086 | &portdev->c_ivq_lock); | |
335a64a5 | 2087 | if (!nr_added_bufs) { |
22a29eac AS |
2088 | dev_err(&vdev->dev, |
2089 | "Error allocating buffers for control queue\n"); | |
2090 | err = -ENOMEM; | |
2091 | goto free_vqs; | |
2092 | } | |
1d05160b AS |
2093 | } else { |
2094 | /* | |
2095 | * For backward compatibility: Create a console port | |
2096 | * if we're running on older host. | |
2097 | */ | |
2098 | add_port(portdev, 0); | |
17634ba2 AS |
2099 | } |
2100 | ||
6bdf2afd AS |
2101 | spin_lock_irq(&pdrvdata_lock); |
2102 | list_add_tail(&portdev->list, &pdrvdata.portdevs); | |
2103 | spin_unlock_irq(&pdrvdata_lock); | |
2104 | ||
f909f850 AS |
2105 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
2106 | VIRTIO_CONSOLE_DEVICE_READY, 1); | |
5e38483b CB |
2107 | |
2108 | /* | |
2109 | * If there was an early virtio console, assume that there are no | |
2110 | * other consoles. We need to wait until the hvc_alloc matches the | |
2111 | * hvc_instantiate, otherwise tty_open will complain, resulting in | |
2112 | * a "Warning: unable to open an initial console" boot failure. | |
2113 | * Without multiport this is done in add_port above. With multiport | |
2114 | * this might take some host<->guest communication - thus we have to | |
2115 | * wait. | |
2116 | */ | |
2117 | if (multiport && early) | |
2118 | wait_for_completion(&early_console_added); | |
2119 | ||
31610434 RR |
2120 | return 0; |
2121 | ||
22a29eac | 2122 | free_vqs: |
0643e4c6 JL |
2123 | /* The host might want to notify mgmt sw about device add failure */ |
2124 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, | |
2125 | VIRTIO_CONSOLE_DEVICE_READY, 0); | |
a0e2dbfc | 2126 | remove_vqs(portdev); |
fb08bd27 AS |
2127 | free_chrdev: |
2128 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 2129 | free: |
1c85bf35 | 2130 | kfree(portdev); |
31610434 RR |
2131 | fail: |
2132 | return err; | |
2133 | } | |
2134 | ||
7177876f AS |
2135 | static void virtcons_remove(struct virtio_device *vdev) |
2136 | { | |
2137 | struct ports_device *portdev; | |
2138 | struct port *port, *port2; | |
7177876f AS |
2139 | |
2140 | portdev = vdev->priv; | |
2141 | ||
6bdf2afd AS |
2142 | spin_lock_irq(&pdrvdata_lock); |
2143 | list_del(&portdev->list); | |
2144 | spin_unlock_irq(&pdrvdata_lock); | |
2145 | ||
02238959 AS |
2146 | /* Disable interrupts for vqs */ |
2147 | vdev->config->reset(vdev); | |
2148 | /* Finish up work that's lined up */ | |
aded024a SB |
2149 | if (use_multiport(portdev)) |
2150 | cancel_work_sync(&portdev->control_work); | |
eeb8a7e8 MT |
2151 | else |
2152 | cancel_work_sync(&portdev->config_work); | |
7177876f AS |
2153 | |
2154 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
b353a6b8 | 2155 | unplug_port(port); |
7177876f AS |
2156 | |
2157 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
2158 | ||
e062013c AS |
2159 | /* |
2160 | * When yanking out a device, we immediately lose the | |
2161 | * (device-side) queues. So there's no point in keeping the | |
2162 | * guest side around till we drop our final reference. This | |
2163 | * also means that any ports which are in an open state will | |
2164 | * have to just stop using the port, as the vqs are going | |
2165 | * away. | |
2166 | */ | |
a0e2dbfc AS |
2167 | remove_controlq_data(portdev); |
2168 | remove_vqs(portdev); | |
7177876f AS |
2169 | kfree(portdev); |
2170 | } | |
2171 | ||
31610434 RR |
2172 | static struct virtio_device_id id_table[] = { |
2173 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
2174 | { 0 }, | |
2175 | }; | |
2176 | ||
c2983458 CB |
2177 | static unsigned int features[] = { |
2178 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 2179 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
2180 | }; |
2181 | ||
1b637046 SB |
2182 | static struct virtio_device_id rproc_serial_id_table[] = { |
2183 | #if IS_ENABLED(CONFIG_REMOTEPROC) | |
2184 | { VIRTIO_ID_RPROC_SERIAL, VIRTIO_DEV_ANY_ID }, | |
2185 | #endif | |
2186 | { 0 }, | |
2187 | }; | |
2188 | ||
2189 | static unsigned int rproc_serial_features[] = { | |
2190 | }; | |
2191 | ||
89107000 | 2192 | #ifdef CONFIG_PM_SLEEP |
2b8f41d8 AS |
2193 | static int virtcons_freeze(struct virtio_device *vdev) |
2194 | { | |
2195 | struct ports_device *portdev; | |
2196 | struct port *port; | |
2197 | ||
2198 | portdev = vdev->priv; | |
2199 | ||
2200 | vdev->config->reset(vdev); | |
2201 | ||
2055997f MT |
2202 | if (use_multiport(portdev)) |
2203 | virtqueue_disable_cb(portdev->c_ivq); | |
2b8f41d8 | 2204 | cancel_work_sync(&portdev->control_work); |
eeb8a7e8 | 2205 | cancel_work_sync(&portdev->config_work); |
c743d09d AS |
2206 | /* |
2207 | * Once more: if control_work_handler() was running, it would | |
2208 | * enable the cb as the last step. | |
2209 | */ | |
2055997f MT |
2210 | if (use_multiport(portdev)) |
2211 | virtqueue_disable_cb(portdev->c_ivq); | |
2b8f41d8 AS |
2212 | remove_controlq_data(portdev); |
2213 | ||
2214 | list_for_each_entry(port, &portdev->ports, list) { | |
c743d09d AS |
2215 | virtqueue_disable_cb(port->in_vq); |
2216 | virtqueue_disable_cb(port->out_vq); | |
2b8f41d8 AS |
2217 | /* |
2218 | * We'll ask the host later if the new invocation has | |
2219 | * the port opened or closed. | |
2220 | */ | |
2221 | port->host_connected = false; | |
2222 | remove_port_data(port); | |
2223 | } | |
2224 | remove_vqs(portdev); | |
2225 | ||
2226 | return 0; | |
2227 | } | |
2228 | ||
2229 | static int virtcons_restore(struct virtio_device *vdev) | |
2230 | { | |
2231 | struct ports_device *portdev; | |
2232 | struct port *port; | |
2233 | int ret; | |
2234 | ||
2235 | portdev = vdev->priv; | |
2236 | ||
2237 | ret = init_vqs(portdev); | |
2238 | if (ret) | |
2239 | return ret; | |
2240 | ||
401bbdc9 MT |
2241 | virtio_device_ready(portdev->vdev); |
2242 | ||
2b8f41d8 | 2243 | if (use_multiport(portdev)) |
165b1b8b | 2244 | fill_queue(portdev->c_ivq, &portdev->c_ivq_lock); |
2b8f41d8 AS |
2245 | |
2246 | list_for_each_entry(port, &portdev->ports, list) { | |
2247 | port->in_vq = portdev->in_vqs[port->id]; | |
2248 | port->out_vq = portdev->out_vqs[port->id]; | |
2249 | ||
2250 | fill_queue(port->in_vq, &port->inbuf_lock); | |
2251 | ||
2252 | /* Get port open/close status on the host */ | |
2253 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
fa8b66cc AS |
2254 | |
2255 | /* | |
2256 | * If a port was open at the time of suspending, we | |
2257 | * have to let the host know that it's still open. | |
2258 | */ | |
2259 | if (port->guest_connected) | |
2260 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
2b8f41d8 AS |
2261 | } |
2262 | return 0; | |
2263 | } | |
2264 | #endif | |
2265 | ||
31610434 | 2266 | static struct virtio_driver virtio_console = { |
c2983458 CB |
2267 | .feature_table = features, |
2268 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
2269 | .driver.name = KBUILD_MODNAME, |
2270 | .driver.owner = THIS_MODULE, | |
2271 | .id_table = id_table, | |
2272 | .probe = virtcons_probe, | |
7177876f | 2273 | .remove = virtcons_remove, |
7f5d810d | 2274 | .config_changed = config_intr, |
89107000 | 2275 | #ifdef CONFIG_PM_SLEEP |
2b8f41d8 AS |
2276 | .freeze = virtcons_freeze, |
2277 | .restore = virtcons_restore, | |
2278 | #endif | |
31610434 RR |
2279 | }; |
2280 | ||
bcd2982a | 2281 | static struct virtio_driver virtio_rproc_serial = { |
1b637046 SB |
2282 | .feature_table = rproc_serial_features, |
2283 | .feature_table_size = ARRAY_SIZE(rproc_serial_features), | |
2284 | .driver.name = "virtio_rproc_serial", | |
2285 | .driver.owner = THIS_MODULE, | |
2286 | .id_table = rproc_serial_id_table, | |
2287 | .probe = virtcons_probe, | |
2288 | .remove = virtcons_remove, | |
2289 | }; | |
2290 | ||
31610434 RR |
2291 | static int __init init(void) |
2292 | { | |
fb08bd27 AS |
2293 | int err; |
2294 | ||
2295 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
2296 | if (IS_ERR(pdrvdata.class)) { | |
2297 | err = PTR_ERR(pdrvdata.class); | |
2298 | pr_err("Error %d creating virtio-ports class\n", err); | |
2299 | return err; | |
2300 | } | |
d99393ef AS |
2301 | |
2302 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
3f0d0c9b | 2303 | if (!pdrvdata.debugfs_dir) |
2eec1080 | 2304 | pr_warn("Error creating debugfs dir for virtio-ports\n"); |
38edf58d | 2305 | INIT_LIST_HEAD(&pdrvdata.consoles); |
6bdf2afd | 2306 | INIT_LIST_HEAD(&pdrvdata.portdevs); |
38edf58d | 2307 | |
33e1afc3 AK |
2308 | err = register_virtio_driver(&virtio_console); |
2309 | if (err < 0) { | |
2310 | pr_err("Error %d registering virtio driver\n", err); | |
2311 | goto free; | |
2312 | } | |
1b637046 SB |
2313 | err = register_virtio_driver(&virtio_rproc_serial); |
2314 | if (err < 0) { | |
2315 | pr_err("Error %d registering virtio rproc serial driver\n", | |
2316 | err); | |
2317 | goto unregister; | |
2318 | } | |
33e1afc3 | 2319 | return 0; |
1b637046 SB |
2320 | unregister: |
2321 | unregister_virtio_driver(&virtio_console); | |
33e1afc3 | 2322 | free: |
5885e48e | 2323 | debugfs_remove_recursive(pdrvdata.debugfs_dir); |
33e1afc3 AK |
2324 | class_destroy(pdrvdata.class); |
2325 | return err; | |
31610434 | 2326 | } |
7177876f AS |
2327 | |
2328 | static void __exit fini(void) | |
2329 | { | |
1b637046 SB |
2330 | reclaim_dma_bufs(); |
2331 | ||
7177876f | 2332 | unregister_virtio_driver(&virtio_console); |
1b637046 | 2333 | unregister_virtio_driver(&virtio_rproc_serial); |
7177876f AS |
2334 | |
2335 | class_destroy(pdrvdata.class); | |
5885e48e | 2336 | debugfs_remove_recursive(pdrvdata.debugfs_dir); |
7177876f | 2337 | } |
31610434 | 2338 | module_init(init); |
7177876f | 2339 | module_exit(fini); |
31610434 RR |
2340 | |
2341 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2342 | MODULE_DESCRIPTION("Virtio console driver"); | |
2343 | MODULE_LICENSE("GPL"); |