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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 | 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. | |
454 | * The code here would have been less quirky if | |
455 | * DMA_MEMORY_INCLUDES_CHILDREN had been supported | |
456 | * in dma-coherent.c | |
457 | */ | |
458 | if (!vq->vdev->dev.parent || !vq->vdev->dev.parent->parent) | |
459 | goto free_buf; | |
460 | buf->dev = vq->vdev->dev.parent->parent; | |
461 | ||
462 | /* Increase device refcnt to avoid freeing it */ | |
463 | get_device(buf->dev); | |
464 | buf->buf = dma_alloc_coherent(buf->dev, buf_size, &buf->dma, | |
465 | GFP_KERNEL); | |
466 | } else { | |
467 | buf->dev = NULL; | |
468 | buf->buf = kmalloc(buf_size, GFP_KERNEL); | |
469 | } | |
470 | ||
fdb9a054 AS |
471 | if (!buf->buf) |
472 | goto free_buf; | |
473 | buf->len = 0; | |
474 | buf->offset = 0; | |
475 | buf->size = buf_size; | |
476 | return buf; | |
477 | ||
478 | free_buf: | |
479 | kfree(buf); | |
480 | fail: | |
481 | return NULL; | |
482 | } | |
483 | ||
a3cde449 | 484 | /* Callers should take appropriate locks */ |
defde669 | 485 | static struct port_buffer *get_inbuf(struct port *port) |
a3cde449 AS |
486 | { |
487 | struct port_buffer *buf; | |
a3cde449 AS |
488 | unsigned int len; |
489 | ||
d25a9dda AS |
490 | if (port->inbuf) |
491 | return port->inbuf; | |
492 | ||
493 | buf = virtqueue_get_buf(port->in_vq, &len); | |
a3cde449 AS |
494 | if (buf) { |
495 | buf->len = len; | |
496 | buf->offset = 0; | |
17e5b4f2 | 497 | port->stats.bytes_received += len; |
a3cde449 AS |
498 | } |
499 | return buf; | |
500 | } | |
501 | ||
e27b5198 AS |
502 | /* |
503 | * Create a scatter-gather list representing our input buffer and put | |
504 | * it in the queue. | |
505 | * | |
506 | * Callers should take appropriate locks. | |
507 | */ | |
203baab8 | 508 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
509 | { |
510 | struct scatterlist sg[1]; | |
203baab8 | 511 | int ret; |
1c85bf35 | 512 | |
e27b5198 AS |
513 | sg_init_one(sg, buf->buf, buf->size); |
514 | ||
6797999d | 515 | ret = virtqueue_add_inbuf(vq, sg, 1, buf, GFP_ATOMIC); |
505b0451 | 516 | virtqueue_kick(vq); |
49e86f16 AS |
517 | if (!ret) |
518 | ret = vq->num_free; | |
203baab8 AS |
519 | return ret; |
520 | } | |
521 | ||
88f251ac AS |
522 | /* Discard any unread data this port has. Callers lockers. */ |
523 | static void discard_port_data(struct port *port) | |
524 | { | |
525 | struct port_buffer *buf; | |
2d24cdaa | 526 | unsigned int err; |
88f251ac | 527 | |
d7a62cd0 AS |
528 | if (!port->portdev) { |
529 | /* Device has been unplugged. vqs are already gone. */ | |
530 | return; | |
531 | } | |
2d24cdaa | 532 | buf = get_inbuf(port); |
88f251ac | 533 | |
ce072a0c | 534 | err = 0; |
d6933561 | 535 | while (buf) { |
17e5b4f2 | 536 | port->stats.bytes_discarded += buf->len - buf->offset; |
2d24cdaa | 537 | if (add_inbuf(port->in_vq, buf) < 0) { |
ce072a0c | 538 | err++; |
1b637046 | 539 | free_buf(buf, false); |
d6933561 | 540 | } |
2d24cdaa AS |
541 | port->inbuf = NULL; |
542 | buf = get_inbuf(port); | |
88f251ac | 543 | } |
ce072a0c | 544 | if (err) |
d6933561 | 545 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", |
ce072a0c | 546 | err); |
88f251ac AS |
547 | } |
548 | ||
203baab8 AS |
549 | static bool port_has_data(struct port *port) |
550 | { | |
551 | unsigned long flags; | |
552 | bool ret; | |
553 | ||
d25a9dda | 554 | ret = false; |
203baab8 | 555 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 556 | port->inbuf = get_inbuf(port); |
d25a9dda | 557 | if (port->inbuf) |
d6933561 | 558 | ret = true; |
d25a9dda | 559 | |
203baab8 | 560 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
561 | return ret; |
562 | } | |
563 | ||
3425e706 AS |
564 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
565 | unsigned int event, unsigned int value) | |
17634ba2 AS |
566 | { |
567 | struct scatterlist sg[1]; | |
17634ba2 | 568 | struct virtqueue *vq; |
604b2ad7 | 569 | unsigned int len; |
17634ba2 | 570 | |
3425e706 | 571 | if (!use_multiport(portdev)) |
17634ba2 AS |
572 | return 0; |
573 | ||
3425e706 | 574 | vq = portdev->c_ovq; |
17634ba2 | 575 | |
9ba5c80b | 576 | spin_lock(&portdev->c_ovq_lock); |
5e59d9a1 AL |
577 | |
578 | portdev->cpkt.id = cpu_to_virtio32(portdev->vdev, port_id); | |
579 | portdev->cpkt.event = cpu_to_virtio16(portdev->vdev, event); | |
580 | portdev->cpkt.value = cpu_to_virtio16(portdev->vdev, value); | |
581 | ||
582 | sg_init_one(sg, &portdev->cpkt, sizeof(struct virtio_console_control)); | |
583 | ||
584 | if (virtqueue_add_outbuf(vq, sg, 1, &portdev->cpkt, GFP_ATOMIC) == 0) { | |
505b0451 | 585 | virtqueue_kick(vq); |
40e4dc53 HG |
586 | while (!virtqueue_get_buf(vq, &len) |
587 | && !virtqueue_is_broken(vq)) | |
17634ba2 AS |
588 | cpu_relax(); |
589 | } | |
5e59d9a1 | 590 | |
9ba5c80b | 591 | spin_unlock(&portdev->c_ovq_lock); |
17634ba2 AS |
592 | return 0; |
593 | } | |
594 | ||
3425e706 AS |
595 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
596 | unsigned int value) | |
597 | { | |
84ec06c5 AS |
598 | /* Did the port get unplugged before userspace closed it? */ |
599 | if (port->portdev) | |
600 | return __send_control_msg(port->portdev, port->id, event, value); | |
601 | return 0; | |
3425e706 AS |
602 | } |
603 | ||
eb5e89fc | 604 | |
cdfadfc1 AS |
605 | /* Callers must take the port->outvq_lock */ |
606 | static void reclaim_consumed_buffers(struct port *port) | |
607 | { | |
276a3e95 | 608 | struct port_buffer *buf; |
cdfadfc1 AS |
609 | unsigned int len; |
610 | ||
d7a62cd0 AS |
611 | if (!port->portdev) { |
612 | /* Device has been unplugged. vqs are already gone. */ | |
613 | return; | |
614 | } | |
276a3e95 | 615 | while ((buf = virtqueue_get_buf(port->out_vq, &len))) { |
1b637046 | 616 | free_buf(buf, false); |
cdfadfc1 AS |
617 | port->outvq_full = false; |
618 | } | |
619 | } | |
620 | ||
eb5e89fc MH |
621 | static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, |
622 | int nents, size_t in_count, | |
276a3e95 | 623 | void *data, bool nonblock) |
f997f00b | 624 | { |
f997f00b | 625 | struct virtqueue *out_vq; |
589575a2 | 626 | int err; |
cdfadfc1 | 627 | unsigned long flags; |
f997f00b AS |
628 | unsigned int len; |
629 | ||
630 | out_vq = port->out_vq; | |
631 | ||
cdfadfc1 AS |
632 | spin_lock_irqsave(&port->outvq_lock, flags); |
633 | ||
634 | reclaim_consumed_buffers(port); | |
635 | ||
6797999d | 636 | err = virtqueue_add_outbuf(out_vq, sg, nents, data, GFP_ATOMIC); |
f997f00b AS |
637 | |
638 | /* Tell Host to go! */ | |
505b0451 | 639 | virtqueue_kick(out_vq); |
f997f00b | 640 | |
589575a2 | 641 | if (err) { |
9ff4cfab | 642 | in_count = 0; |
cdfadfc1 | 643 | goto done; |
f997f00b AS |
644 | } |
645 | ||
589575a2 | 646 | if (out_vq->num_free == 0) |
cdfadfc1 AS |
647 | port->outvq_full = true; |
648 | ||
649 | if (nonblock) | |
650 | goto done; | |
651 | ||
652 | /* | |
653 | * Wait till the host acknowledges it pushed out the data we | |
531295e6 AS |
654 | * sent. This is done for data from the hvc_console; the tty |
655 | * operations are performed with spinlocks held so we can't | |
656 | * sleep here. An alternative would be to copy the data to a | |
657 | * buffer and relax the spinning requirement. The downside is | |
658 | * we need to kmalloc a GFP_ATOMIC buffer each time the | |
659 | * console driver writes something out. | |
cdfadfc1 | 660 | */ |
40e4dc53 HG |
661 | while (!virtqueue_get_buf(out_vq, &len) |
662 | && !virtqueue_is_broken(out_vq)) | |
f997f00b | 663 | cpu_relax(); |
cdfadfc1 AS |
664 | done: |
665 | spin_unlock_irqrestore(&port->outvq_lock, flags); | |
17e5b4f2 AS |
666 | |
667 | port->stats.bytes_sent += in_count; | |
cdfadfc1 AS |
668 | /* |
669 | * We're expected to return the amount of data we wrote -- all | |
670 | * of it | |
671 | */ | |
9ff4cfab | 672 | return in_count; |
f997f00b AS |
673 | } |
674 | ||
203baab8 AS |
675 | /* |
676 | * Give out the data that's requested from the buffer that we have | |
677 | * queued up. | |
678 | */ | |
48b36066 MT |
679 | static ssize_t fill_readbuf(struct port *port, char __user *out_buf, |
680 | size_t out_count, bool to_user) | |
203baab8 AS |
681 | { |
682 | struct port_buffer *buf; | |
683 | unsigned long flags; | |
684 | ||
685 | if (!out_count || !port_has_data(port)) | |
686 | return 0; | |
687 | ||
688 | buf = port->inbuf; | |
b766ceed | 689 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 690 | |
b766ceed AS |
691 | if (to_user) { |
692 | ssize_t ret; | |
693 | ||
694 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
695 | if (ret) | |
696 | return -EFAULT; | |
697 | } else { | |
48b36066 MT |
698 | memcpy((__force char *)out_buf, buf->buf + buf->offset, |
699 | out_count); | |
b766ceed | 700 | } |
203baab8 | 701 | |
203baab8 AS |
702 | buf->offset += out_count; |
703 | ||
704 | if (buf->offset == buf->len) { | |
705 | /* | |
706 | * We're done using all the data in this buffer. | |
707 | * Re-queue so that the Host can send us more data. | |
708 | */ | |
709 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
710 | port->inbuf = NULL; | |
711 | ||
712 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 713 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
714 | |
715 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
716 | } | |
b766ceed | 717 | /* Return the number of bytes actually copied */ |
203baab8 | 718 | return out_count; |
e27b5198 AS |
719 | } |
720 | ||
2030fa49 | 721 | /* The condition that must be true for polling to end */ |
60caacd3 | 722 | static bool will_read_block(struct port *port) |
2030fa49 | 723 | { |
3709ea7a AS |
724 | if (!port->guest_connected) { |
725 | /* Port got hot-unplugged. Let's exit. */ | |
726 | return false; | |
727 | } | |
60caacd3 | 728 | return !port_has_data(port) && port->host_connected; |
2030fa49 AS |
729 | } |
730 | ||
cdfadfc1 AS |
731 | static bool will_write_block(struct port *port) |
732 | { | |
733 | bool ret; | |
734 | ||
60e5e0b8 AS |
735 | if (!port->guest_connected) { |
736 | /* Port got hot-unplugged. Let's exit. */ | |
737 | return false; | |
738 | } | |
cdfadfc1 AS |
739 | if (!port->host_connected) |
740 | return true; | |
741 | ||
742 | spin_lock_irq(&port->outvq_lock); | |
743 | /* | |
744 | * Check if the Host has consumed any buffers since we last | |
745 | * sent data (this is only applicable for nonblocking ports). | |
746 | */ | |
747 | reclaim_consumed_buffers(port); | |
748 | ret = port->outvq_full; | |
749 | spin_unlock_irq(&port->outvq_lock); | |
750 | ||
751 | return ret; | |
752 | } | |
753 | ||
2030fa49 AS |
754 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, |
755 | size_t count, loff_t *offp) | |
756 | { | |
757 | struct port *port; | |
758 | ssize_t ret; | |
759 | ||
760 | port = filp->private_data; | |
761 | ||
96f97a83 AS |
762 | /* Port is hot-unplugged. */ |
763 | if (!port->guest_connected) | |
764 | return -ENODEV; | |
765 | ||
2030fa49 AS |
766 | if (!port_has_data(port)) { |
767 | /* | |
768 | * If nothing's connected on the host just return 0 in | |
769 | * case of list_empty; this tells the userspace app | |
770 | * that there's no connection | |
771 | */ | |
772 | if (!port->host_connected) | |
773 | return 0; | |
774 | if (filp->f_flags & O_NONBLOCK) | |
775 | return -EAGAIN; | |
776 | ||
a08fa92d AS |
777 | ret = wait_event_freezable(port->waitqueue, |
778 | !will_read_block(port)); | |
2030fa49 AS |
779 | if (ret < 0) |
780 | return ret; | |
781 | } | |
96f97a83 | 782 | /* Port got hot-unplugged while we were waiting above. */ |
b3dddb9e AS |
783 | if (!port->guest_connected) |
784 | return -ENODEV; | |
2030fa49 AS |
785 | /* |
786 | * We could've received a disconnection message while we were | |
787 | * waiting for more data. | |
788 | * | |
789 | * This check is not clubbed in the if() statement above as we | |
790 | * might receive some data as well as the host could get | |
791 | * disconnected after we got woken up from our wait. So we | |
792 | * really want to give off whatever data we have and only then | |
793 | * check for host_connected. | |
794 | */ | |
795 | if (!port_has_data(port) && !port->host_connected) | |
796 | return 0; | |
797 | ||
798 | return fill_readbuf(port, ubuf, count, true); | |
799 | } | |
800 | ||
efe75d24 MH |
801 | static int wait_port_writable(struct port *port, bool nonblock) |
802 | { | |
803 | int ret; | |
804 | ||
805 | if (will_write_block(port)) { | |
806 | if (nonblock) | |
807 | return -EAGAIN; | |
808 | ||
809 | ret = wait_event_freezable(port->waitqueue, | |
810 | !will_write_block(port)); | |
811 | if (ret < 0) | |
812 | return ret; | |
813 | } | |
814 | /* Port got hot-unplugged. */ | |
815 | if (!port->guest_connected) | |
816 | return -ENODEV; | |
817 | ||
818 | return 0; | |
819 | } | |
820 | ||
2030fa49 AS |
821 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, |
822 | size_t count, loff_t *offp) | |
823 | { | |
824 | struct port *port; | |
276a3e95 | 825 | struct port_buffer *buf; |
2030fa49 | 826 | ssize_t ret; |
cdfadfc1 | 827 | bool nonblock; |
276a3e95 | 828 | struct scatterlist sg[1]; |
2030fa49 | 829 | |
65745422 AS |
830 | /* Userspace could be out to fool us */ |
831 | if (!count) | |
832 | return 0; | |
833 | ||
2030fa49 AS |
834 | port = filp->private_data; |
835 | ||
cdfadfc1 AS |
836 | nonblock = filp->f_flags & O_NONBLOCK; |
837 | ||
efe75d24 MH |
838 | ret = wait_port_writable(port, nonblock); |
839 | if (ret < 0) | |
840 | return ret; | |
cdfadfc1 | 841 | |
2030fa49 AS |
842 | count = min((size_t)(32 * 1024), count); |
843 | ||
276a3e95 | 844 | buf = alloc_buf(port->out_vq, count, 0); |
2030fa49 AS |
845 | if (!buf) |
846 | return -ENOMEM; | |
847 | ||
276a3e95 | 848 | ret = copy_from_user(buf->buf, ubuf, count); |
2030fa49 AS |
849 | if (ret) { |
850 | ret = -EFAULT; | |
851 | goto free_buf; | |
852 | } | |
853 | ||
531295e6 AS |
854 | /* |
855 | * We now ask send_buf() to not spin for generic ports -- we | |
856 | * can re-use the same code path that non-blocking file | |
857 | * descriptors take for blocking file descriptors since the | |
858 | * wait is already done and we're certain the write will go | |
859 | * through to the host. | |
860 | */ | |
861 | nonblock = true; | |
276a3e95 SB |
862 | sg_init_one(sg, buf->buf, count); |
863 | ret = __send_to_port(port, sg, 1, count, buf, nonblock); | |
cdfadfc1 AS |
864 | |
865 | if (nonblock && ret > 0) | |
866 | goto out; | |
867 | ||
2030fa49 | 868 | free_buf: |
1b637046 | 869 | free_buf(buf, true); |
cdfadfc1 | 870 | out: |
2030fa49 AS |
871 | return ret; |
872 | } | |
873 | ||
eb5e89fc MH |
874 | struct sg_list { |
875 | unsigned int n; | |
8ca84a50 | 876 | unsigned int size; |
eb5e89fc MH |
877 | size_t len; |
878 | struct scatterlist *sg; | |
879 | }; | |
880 | ||
881 | static int pipe_to_sg(struct pipe_inode_info *pipe, struct pipe_buffer *buf, | |
882 | struct splice_desc *sd) | |
883 | { | |
884 | struct sg_list *sgl = sd->u.data; | |
ec8fc870 | 885 | unsigned int offset, len; |
eb5e89fc | 886 | |
8ca84a50 | 887 | if (sgl->n == sgl->size) |
eb5e89fc MH |
888 | return 0; |
889 | ||
890 | /* Try lock this page */ | |
ca76f5b6 | 891 | if (pipe_buf_steal(pipe, buf) == 0) { |
eb5e89fc MH |
892 | /* Get reference and unlock page for moving */ |
893 | get_page(buf->page); | |
894 | unlock_page(buf->page); | |
895 | ||
896 | len = min(buf->len, sd->len); | |
897 | sg_set_page(&(sgl->sg[sgl->n]), buf->page, len, buf->offset); | |
ec8fc870 MH |
898 | } else { |
899 | /* Failback to copying a page */ | |
900 | struct page *page = alloc_page(GFP_KERNEL); | |
c9efe511 | 901 | char *src; |
ec8fc870 MH |
902 | |
903 | if (!page) | |
904 | return -ENOMEM; | |
ec8fc870 MH |
905 | |
906 | offset = sd->pos & ~PAGE_MASK; | |
907 | ||
908 | len = sd->len; | |
909 | if (len + offset > PAGE_SIZE) | |
910 | len = PAGE_SIZE - offset; | |
911 | ||
fbb32750 | 912 | src = kmap_atomic(buf->page); |
c9efe511 | 913 | memcpy(page_address(page) + offset, src + buf->offset, len); |
fbb32750 | 914 | kunmap_atomic(src); |
ec8fc870 MH |
915 | |
916 | sg_set_page(&(sgl->sg[sgl->n]), page, len, offset); | |
eb5e89fc | 917 | } |
ec8fc870 MH |
918 | sgl->n++; |
919 | sgl->len += len; | |
eb5e89fc MH |
920 | |
921 | return len; | |
922 | } | |
923 | ||
924 | /* Faster zero-copy write by splicing */ | |
925 | static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, | |
926 | struct file *filp, loff_t *ppos, | |
927 | size_t len, unsigned int flags) | |
928 | { | |
929 | struct port *port = filp->private_data; | |
930 | struct sg_list sgl; | |
931 | ssize_t ret; | |
276a3e95 | 932 | struct port_buffer *buf; |
eb5e89fc MH |
933 | struct splice_desc sd = { |
934 | .total_len = len, | |
935 | .flags = flags, | |
936 | .pos = *ppos, | |
937 | .u.data = &sgl, | |
938 | }; | |
939 | ||
1b637046 SB |
940 | /* |
941 | * Rproc_serial does not yet support splice. To support splice | |
942 | * pipe_to_sg() must allocate dma-buffers and copy content from | |
943 | * regular pages to dma pages. And alloc_buf and free_buf must | |
944 | * support allocating and freeing such a list of dma-buffers. | |
945 | */ | |
946 | if (is_rproc_serial(port->out_vq->vdev)) | |
947 | return -EINVAL; | |
948 | ||
68c034fe YY |
949 | /* |
950 | * pipe->nrbufs == 0 means there are no data to transfer, | |
951 | * so this returns just 0 for no data. | |
952 | */ | |
2b4fbf02 YY |
953 | pipe_lock(pipe); |
954 | if (!pipe->nrbufs) { | |
955 | ret = 0; | |
956 | goto error_out; | |
957 | } | |
68c034fe | 958 | |
efe75d24 MH |
959 | ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK); |
960 | if (ret < 0) | |
2b4fbf02 | 961 | goto error_out; |
efe75d24 | 962 | |
276a3e95 | 963 | buf = alloc_buf(port->out_vq, 0, pipe->nrbufs); |
2b4fbf02 YY |
964 | if (!buf) { |
965 | ret = -ENOMEM; | |
966 | goto error_out; | |
967 | } | |
276a3e95 | 968 | |
eb5e89fc MH |
969 | sgl.n = 0; |
970 | sgl.len = 0; | |
8ca84a50 | 971 | sgl.size = pipe->nrbufs; |
276a3e95 | 972 | sgl.sg = buf->sg; |
8ca84a50 | 973 | sg_init_table(sgl.sg, sgl.size); |
eb5e89fc | 974 | ret = __splice_from_pipe(pipe, &sd, pipe_to_sg); |
2b4fbf02 | 975 | pipe_unlock(pipe); |
eb5e89fc | 976 | if (likely(ret > 0)) |
276a3e95 | 977 | ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true); |
eb5e89fc | 978 | |
fe529537 | 979 | if (unlikely(ret <= 0)) |
1b637046 | 980 | free_buf(buf, true); |
eb5e89fc | 981 | return ret; |
2b4fbf02 YY |
982 | |
983 | error_out: | |
984 | pipe_unlock(pipe); | |
985 | return ret; | |
eb5e89fc MH |
986 | } |
987 | ||
2030fa49 AS |
988 | static unsigned int port_fops_poll(struct file *filp, poll_table *wait) |
989 | { | |
990 | struct port *port; | |
991 | unsigned int ret; | |
992 | ||
993 | port = filp->private_data; | |
994 | poll_wait(filp, &port->waitqueue, wait); | |
995 | ||
8529a504 AS |
996 | if (!port->guest_connected) { |
997 | /* Port got unplugged */ | |
998 | return POLLHUP; | |
999 | } | |
2030fa49 | 1000 | ret = 0; |
6df7aadc | 1001 | if (!will_read_block(port)) |
2030fa49 | 1002 | ret |= POLLIN | POLLRDNORM; |
cdfadfc1 | 1003 | if (!will_write_block(port)) |
2030fa49 AS |
1004 | ret |= POLLOUT; |
1005 | if (!port->host_connected) | |
1006 | ret |= POLLHUP; | |
1007 | ||
1008 | return ret; | |
1009 | } | |
1010 | ||
b353a6b8 AS |
1011 | static void remove_port(struct kref *kref); |
1012 | ||
2030fa49 AS |
1013 | static int port_fops_release(struct inode *inode, struct file *filp) |
1014 | { | |
1015 | struct port *port; | |
1016 | ||
1017 | port = filp->private_data; | |
1018 | ||
1019 | /* Notify host of port being closed */ | |
1020 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
1021 | ||
88f251ac | 1022 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
1023 | port->guest_connected = false; |
1024 | ||
88f251ac AS |
1025 | discard_port_data(port); |
1026 | ||
1027 | spin_unlock_irq(&port->inbuf_lock); | |
1028 | ||
cdfadfc1 AS |
1029 | spin_lock_irq(&port->outvq_lock); |
1030 | reclaim_consumed_buffers(port); | |
1031 | spin_unlock_irq(&port->outvq_lock); | |
1032 | ||
1b637046 | 1033 | reclaim_dma_bufs(); |
b353a6b8 AS |
1034 | /* |
1035 | * Locks aren't necessary here as a port can't be opened after | |
1036 | * unplug, and if a port isn't unplugged, a kref would already | |
1037 | * exist for the port. Plus, taking ports_lock here would | |
1038 | * create a dependency on other locks taken by functions | |
1039 | * inside remove_port if we're the last holder of the port, | |
1040 | * creating many problems. | |
1041 | */ | |
1042 | kref_put(&port->kref, remove_port); | |
1043 | ||
2030fa49 AS |
1044 | return 0; |
1045 | } | |
1046 | ||
1047 | static int port_fops_open(struct inode *inode, struct file *filp) | |
1048 | { | |
1049 | struct cdev *cdev = inode->i_cdev; | |
1050 | struct port *port; | |
8ad37e83 | 1051 | int ret; |
2030fa49 | 1052 | |
057b82be | 1053 | /* We get the port with a kref here */ |
04950cdf | 1054 | port = find_port_by_devt(cdev->dev); |
671bdea2 AS |
1055 | if (!port) { |
1056 | /* Port was unplugged before we could proceed */ | |
1057 | return -ENXIO; | |
1058 | } | |
2030fa49 AS |
1059 | filp->private_data = port; |
1060 | ||
1061 | /* | |
1062 | * Don't allow opening of console port devices -- that's done | |
1063 | * via /dev/hvc | |
1064 | */ | |
8ad37e83 AS |
1065 | if (is_console_port(port)) { |
1066 | ret = -ENXIO; | |
1067 | goto out; | |
1068 | } | |
2030fa49 | 1069 | |
3c7969cc AS |
1070 | /* Allow only one process to open a particular port at a time */ |
1071 | spin_lock_irq(&port->inbuf_lock); | |
1072 | if (port->guest_connected) { | |
1073 | spin_unlock_irq(&port->inbuf_lock); | |
74ff582c | 1074 | ret = -EBUSY; |
8ad37e83 | 1075 | goto out; |
3c7969cc AS |
1076 | } |
1077 | ||
1078 | port->guest_connected = true; | |
1079 | spin_unlock_irq(&port->inbuf_lock); | |
1080 | ||
cdfadfc1 AS |
1081 | spin_lock_irq(&port->outvq_lock); |
1082 | /* | |
1083 | * There might be a chance that we missed reclaiming a few | |
1084 | * buffers in the window of the port getting previously closed | |
1085 | * and opening now. | |
1086 | */ | |
1087 | reclaim_consumed_buffers(port); | |
1088 | spin_unlock_irq(&port->outvq_lock); | |
1089 | ||
299fb61c AS |
1090 | nonseekable_open(inode, filp); |
1091 | ||
2030fa49 AS |
1092 | /* Notify host of port being opened */ |
1093 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1094 | ||
1095 | return 0; | |
8ad37e83 | 1096 | out: |
b353a6b8 | 1097 | kref_put(&port->kref, remove_port); |
8ad37e83 | 1098 | return ret; |
2030fa49 AS |
1099 | } |
1100 | ||
3eae0ade AS |
1101 | static int port_fops_fasync(int fd, struct file *filp, int mode) |
1102 | { | |
1103 | struct port *port; | |
1104 | ||
1105 | port = filp->private_data; | |
1106 | return fasync_helper(fd, filp, mode, &port->async_queue); | |
1107 | } | |
1108 | ||
2030fa49 AS |
1109 | /* |
1110 | * The file operations that we support: programs in the guest can open | |
1111 | * a console device, read from it, write to it, poll for data and | |
1112 | * close it. The devices are at | |
1113 | * /dev/vport<device number>p<port number> | |
1114 | */ | |
1115 | static const struct file_operations port_fops = { | |
1116 | .owner = THIS_MODULE, | |
1117 | .open = port_fops_open, | |
1118 | .read = port_fops_read, | |
1119 | .write = port_fops_write, | |
eb5e89fc | 1120 | .splice_write = port_fops_splice_write, |
2030fa49 AS |
1121 | .poll = port_fops_poll, |
1122 | .release = port_fops_release, | |
3eae0ade | 1123 | .fasync = port_fops_fasync, |
299fb61c | 1124 | .llseek = no_llseek, |
2030fa49 AS |
1125 | }; |
1126 | ||
a23ea924 RR |
1127 | /* |
1128 | * The put_chars() callback is pretty straightforward. | |
31610434 | 1129 | * |
a23ea924 RR |
1130 | * We turn the characters into a scatter-gather list, add it to the |
1131 | * output queue and then kick the Host. Then we sit here waiting for | |
1132 | * it to finish: inefficient in theory, but in practice | |
1133 | * implementations will do it immediately (lguest's Launcher does). | |
1134 | */ | |
31610434 RR |
1135 | static int put_chars(u32 vtermno, const char *buf, int count) |
1136 | { | |
21206ede | 1137 | struct port *port; |
276a3e95 | 1138 | struct scatterlist sg[1]; |
38edf58d | 1139 | |
162a689a FD |
1140 | if (unlikely(early_put_chars)) |
1141 | return early_put_chars(vtermno, buf, count); | |
1142 | ||
38edf58d AS |
1143 | port = find_port_by_vtermno(vtermno); |
1144 | if (!port) | |
6dc69f97 | 1145 | return -EPIPE; |
31610434 | 1146 | |
276a3e95 SB |
1147 | sg_init_one(sg, buf, count); |
1148 | return __send_to_port(port, sg, 1, count, (void *)buf, false); | |
31610434 RR |
1149 | } |
1150 | ||
a23ea924 RR |
1151 | /* |
1152 | * get_chars() is the callback from the hvc_console infrastructure | |
1153 | * when an interrupt is received. | |
31610434 | 1154 | * |
203baab8 AS |
1155 | * We call out to fill_readbuf that gets us the required data from the |
1156 | * buffers that are queued up. | |
a23ea924 | 1157 | */ |
31610434 RR |
1158 | static int get_chars(u32 vtermno, char *buf, int count) |
1159 | { | |
21206ede RR |
1160 | struct port *port; |
1161 | ||
6dc69f97 AS |
1162 | /* If we've not set up the port yet, we have no input to give. */ |
1163 | if (unlikely(early_put_chars)) | |
1164 | return 0; | |
1165 | ||
38edf58d AS |
1166 | port = find_port_by_vtermno(vtermno); |
1167 | if (!port) | |
6dc69f97 | 1168 | return -EPIPE; |
21206ede | 1169 | |
31610434 | 1170 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 1171 | BUG_ON(!port->in_vq); |
31610434 | 1172 | |
48b36066 | 1173 | return fill_readbuf(port, (__force char __user *)buf, count, false); |
31610434 | 1174 | } |
31610434 | 1175 | |
cb06e367 | 1176 | static void resize_console(struct port *port) |
c2983458 | 1177 | { |
cb06e367 | 1178 | struct virtio_device *vdev; |
c2983458 | 1179 | |
2de16a49 | 1180 | /* The port could have been hot-unplugged */ |
9778829c | 1181 | if (!port || !is_console_port(port)) |
2de16a49 AS |
1182 | return; |
1183 | ||
cb06e367 | 1184 | vdev = port->portdev->vdev; |
1b637046 SB |
1185 | |
1186 | /* Don't test F_SIZE at all if we're rproc: not a valid feature! */ | |
1187 | if (!is_rproc_serial(vdev) && | |
1188 | virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) | |
9778829c | 1189 | hvc_resize(port->cons.hvc, port->cons.ws); |
c2983458 CB |
1190 | } |
1191 | ||
38edf58d | 1192 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
1193 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
1194 | { | |
38edf58d AS |
1195 | struct port *port; |
1196 | ||
1197 | port = find_port_by_vtermno(hp->vtermno); | |
1198 | if (!port) | |
1199 | return -EINVAL; | |
1200 | ||
91fcad19 | 1201 | hp->irq_requested = 1; |
cb06e367 | 1202 | resize_console(port); |
c2983458 | 1203 | |
91fcad19 CB |
1204 | return 0; |
1205 | } | |
1206 | ||
1207 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
1208 | { | |
1209 | hp->irq_requested = 0; | |
1210 | } | |
1211 | ||
17634ba2 | 1212 | /* The operations for console ports. */ |
1dff3996 | 1213 | static const struct hv_ops hv_ops = { |
971f3390 RR |
1214 | .get_chars = get_chars, |
1215 | .put_chars = put_chars, | |
1216 | .notifier_add = notifier_add_vio, | |
1217 | .notifier_del = notifier_del_vio, | |
1218 | .notifier_hangup = notifier_del_vio, | |
1219 | }; | |
1220 | ||
1221 | /* | |
1222 | * Console drivers are initialized very early so boot messages can go | |
1223 | * out, so we do things slightly differently from the generic virtio | |
1224 | * initialization of the net and block drivers. | |
1225 | * | |
1226 | * At this stage, the console is output-only. It's too early to set | |
1227 | * up a virtqueue, so we let the drivers do some boutique early-output | |
1228 | * thing. | |
1229 | */ | |
1230 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
1231 | { | |
1232 | early_put_chars = put_chars; | |
1233 | return hvc_instantiate(0, 0, &hv_ops); | |
1234 | } | |
1235 | ||
3826835a | 1236 | static int init_port_console(struct port *port) |
cfa6d379 AS |
1237 | { |
1238 | int ret; | |
1239 | ||
1240 | /* | |
1241 | * The Host's telling us this port is a console port. Hook it | |
1242 | * up with an hvc console. | |
1243 | * | |
1244 | * To set up and manage our virtual console, we call | |
1245 | * hvc_alloc(). | |
1246 | * | |
1247 | * The first argument of hvc_alloc() is the virtual console | |
1248 | * number. The second argument is the parameter for the | |
1249 | * notification mechanism (like irq number). We currently | |
1250 | * leave this as zero, virtqueues have implicit notifications. | |
1251 | * | |
1252 | * The third argument is a "struct hv_ops" containing the | |
1253 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
1254 | * pointers. The final argument is the output buffer size: we | |
1255 | * can do any size, so we put PAGE_SIZE here. | |
1256 | */ | |
1257 | port->cons.vtermno = pdrvdata.next_vtermno; | |
1258 | ||
1259 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
1260 | if (IS_ERR(port->cons.hvc)) { | |
1261 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
1262 | dev_err(port->dev, |
1263 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
1264 | port->cons.hvc = NULL; |
1265 | return ret; | |
1266 | } | |
1267 | spin_lock_irq(&pdrvdata_lock); | |
1268 | pdrvdata.next_vtermno++; | |
1269 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
1270 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 1271 | port->guest_connected = true; |
cfa6d379 | 1272 | |
1d05160b AS |
1273 | /* |
1274 | * Start using the new console output if this is the first | |
1275 | * console to come up. | |
1276 | */ | |
1277 | if (early_put_chars) | |
1278 | early_put_chars = NULL; | |
1279 | ||
2030fa49 AS |
1280 | /* Notify host of port being opened */ |
1281 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1282 | ||
cfa6d379 AS |
1283 | return 0; |
1284 | } | |
1285 | ||
431edb8a AS |
1286 | static ssize_t show_port_name(struct device *dev, |
1287 | struct device_attribute *attr, char *buffer) | |
1288 | { | |
1289 | struct port *port; | |
1290 | ||
1291 | port = dev_get_drvdata(dev); | |
1292 | ||
1293 | return sprintf(buffer, "%s\n", port->name); | |
1294 | } | |
1295 | ||
1296 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
1297 | ||
1298 | static struct attribute *port_sysfs_entries[] = { | |
1299 | &dev_attr_name.attr, | |
1300 | NULL | |
1301 | }; | |
1302 | ||
1303 | static struct attribute_group port_attribute_group = { | |
1304 | .name = NULL, /* put in device directory */ | |
1305 | .attrs = port_sysfs_entries, | |
1306 | }; | |
1307 | ||
d99393ef AS |
1308 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, |
1309 | size_t count, loff_t *offp) | |
1310 | { | |
1311 | struct port *port; | |
1312 | char *buf; | |
1313 | ssize_t ret, out_offset, out_count; | |
1314 | ||
1315 | out_count = 1024; | |
1316 | buf = kmalloc(out_count, GFP_KERNEL); | |
1317 | if (!buf) | |
1318 | return -ENOMEM; | |
1319 | ||
1320 | port = filp->private_data; | |
1321 | out_offset = 0; | |
1322 | out_offset += snprintf(buf + out_offset, out_count, | |
1323 | "name: %s\n", port->name ? port->name : ""); | |
1324 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1325 | "guest_connected: %d\n", port->guest_connected); | |
1326 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1327 | "host_connected: %d\n", port->host_connected); | |
cdfadfc1 AS |
1328 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1329 | "outvq_full: %d\n", port->outvq_full); | |
17e5b4f2 AS |
1330 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1331 | "bytes_sent: %lu\n", port->stats.bytes_sent); | |
1332 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1333 | "bytes_received: %lu\n", | |
1334 | port->stats.bytes_received); | |
1335 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1336 | "bytes_discarded: %lu\n", | |
1337 | port->stats.bytes_discarded); | |
d99393ef AS |
1338 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
1339 | "is_console: %s\n", | |
1340 | is_console_port(port) ? "yes" : "no"); | |
1341 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
1342 | "console_vtermno: %u\n", port->cons.vtermno); | |
1343 | ||
1344 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
1345 | kfree(buf); | |
1346 | return ret; | |
1347 | } | |
1348 | ||
1349 | static const struct file_operations port_debugfs_ops = { | |
1350 | .owner = THIS_MODULE, | |
234e3405 | 1351 | .open = simple_open, |
d99393ef AS |
1352 | .read = debugfs_read, |
1353 | }; | |
1354 | ||
9778829c AS |
1355 | static void set_console_size(struct port *port, u16 rows, u16 cols) |
1356 | { | |
1357 | if (!port || !is_console_port(port)) | |
1358 | return; | |
1359 | ||
1360 | port->cons.ws.ws_row = rows; | |
1361 | port->cons.ws.ws_col = cols; | |
1362 | } | |
1363 | ||
c446f8fc AS |
1364 | static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
1365 | { | |
1366 | struct port_buffer *buf; | |
1367 | unsigned int nr_added_bufs; | |
1368 | int ret; | |
1369 | ||
1370 | nr_added_bufs = 0; | |
1371 | do { | |
276a3e95 | 1372 | buf = alloc_buf(vq, PAGE_SIZE, 0); |
c446f8fc AS |
1373 | if (!buf) |
1374 | break; | |
1375 | ||
1376 | spin_lock_irq(lock); | |
1377 | ret = add_inbuf(vq, buf); | |
1378 | if (ret < 0) { | |
1379 | spin_unlock_irq(lock); | |
1b637046 | 1380 | free_buf(buf, true); |
c446f8fc AS |
1381 | break; |
1382 | } | |
1383 | nr_added_bufs++; | |
1384 | spin_unlock_irq(lock); | |
1385 | } while (ret > 0); | |
1386 | ||
1387 | return nr_added_bufs; | |
1388 | } | |
1389 | ||
3eae0ade AS |
1390 | static void send_sigio_to_port(struct port *port) |
1391 | { | |
1392 | if (port->async_queue && port->guest_connected) | |
1393 | kill_fasync(&port->async_queue, SIGIO, POLL_OUT); | |
1394 | } | |
1395 | ||
c446f8fc AS |
1396 | static int add_port(struct ports_device *portdev, u32 id) |
1397 | { | |
1398 | char debugfs_name[16]; | |
1399 | struct port *port; | |
1400 | struct port_buffer *buf; | |
1401 | dev_t devt; | |
1402 | unsigned int nr_added_bufs; | |
1403 | int err; | |
1404 | ||
1405 | port = kmalloc(sizeof(*port), GFP_KERNEL); | |
1406 | if (!port) { | |
1407 | err = -ENOMEM; | |
1408 | goto fail; | |
1409 | } | |
b353a6b8 | 1410 | kref_init(&port->kref); |
c446f8fc AS |
1411 | |
1412 | port->portdev = portdev; | |
1413 | port->id = id; | |
1414 | ||
1415 | port->name = NULL; | |
1416 | port->inbuf = NULL; | |
1417 | port->cons.hvc = NULL; | |
3eae0ade | 1418 | port->async_queue = NULL; |
c446f8fc | 1419 | |
9778829c AS |
1420 | port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
1421 | ||
c446f8fc | 1422 | port->host_connected = port->guest_connected = false; |
17e5b4f2 | 1423 | port->stats = (struct port_stats) { 0 }; |
c446f8fc | 1424 | |
cdfadfc1 AS |
1425 | port->outvq_full = false; |
1426 | ||
c446f8fc AS |
1427 | port->in_vq = portdev->in_vqs[port->id]; |
1428 | port->out_vq = portdev->out_vqs[port->id]; | |
1429 | ||
d22a6989 AS |
1430 | port->cdev = cdev_alloc(); |
1431 | if (!port->cdev) { | |
1432 | dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); | |
1433 | err = -ENOMEM; | |
1434 | goto free_port; | |
1435 | } | |
1436 | port->cdev->ops = &port_fops; | |
c446f8fc AS |
1437 | |
1438 | devt = MKDEV(portdev->chr_major, id); | |
d22a6989 | 1439 | err = cdev_add(port->cdev, devt, 1); |
c446f8fc AS |
1440 | if (err < 0) { |
1441 | dev_err(&port->portdev->vdev->dev, | |
1442 | "Error %d adding cdev for port %u\n", err, id); | |
d22a6989 | 1443 | goto free_cdev; |
c446f8fc AS |
1444 | } |
1445 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1446 | devt, port, "vport%up%u", | |
dc18f080 | 1447 | port->portdev->vdev->index, id); |
c446f8fc AS |
1448 | if (IS_ERR(port->dev)) { |
1449 | err = PTR_ERR(port->dev); | |
1450 | dev_err(&port->portdev->vdev->dev, | |
1451 | "Error %d creating device for port %u\n", | |
1452 | err, id); | |
1453 | goto free_cdev; | |
1454 | } | |
1455 | ||
1456 | spin_lock_init(&port->inbuf_lock); | |
cdfadfc1 | 1457 | spin_lock_init(&port->outvq_lock); |
c446f8fc AS |
1458 | init_waitqueue_head(&port->waitqueue); |
1459 | ||
1460 | /* Fill the in_vq with buffers so the host can send us data. */ | |
1461 | nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); | |
1462 | if (!nr_added_bufs) { | |
1463 | dev_err(port->dev, "Error allocating inbufs\n"); | |
1464 | err = -ENOMEM; | |
1465 | goto free_device; | |
1466 | } | |
1467 | ||
1b637046 SB |
1468 | if (is_rproc_serial(port->portdev->vdev)) |
1469 | /* | |
1470 | * For rproc_serial assume remote processor is connected. | |
1471 | * rproc_serial does not want the console port, only | |
1472 | * the generic port implementation. | |
1473 | */ | |
aabd6a8f | 1474 | port->host_connected = true; |
1b637046 SB |
1475 | else if (!use_multiport(port->portdev)) { |
1476 | /* | |
1477 | * If we're not using multiport support, | |
1478 | * this has to be a console port. | |
1479 | */ | |
c446f8fc AS |
1480 | err = init_port_console(port); |
1481 | if (err) | |
1482 | goto free_inbufs; | |
1483 | } | |
1484 | ||
1485 | spin_lock_irq(&portdev->ports_lock); | |
1486 | list_add_tail(&port->list, &port->portdev->ports); | |
1487 | spin_unlock_irq(&portdev->ports_lock); | |
1488 | ||
1489 | /* | |
1490 | * Tell the Host we're set so that it can send us various | |
1491 | * configuration parameters for this port (eg, port name, | |
1492 | * caching, whether this is a console port, etc.) | |
1493 | */ | |
1494 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
1495 | ||
1496 | if (pdrvdata.debugfs_dir) { | |
1497 | /* | |
1498 | * Finally, create the debugfs file that we can use to | |
1499 | * inspect a port's state at any time | |
1500 | */ | |
db170068 DC |
1501 | snprintf(debugfs_name, sizeof(debugfs_name), "vport%up%u", |
1502 | port->portdev->vdev->index, id); | |
c446f8fc AS |
1503 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, |
1504 | pdrvdata.debugfs_dir, | |
1505 | port, | |
1506 | &port_debugfs_ops); | |
1507 | } | |
1508 | return 0; | |
1509 | ||
1510 | free_inbufs: | |
1511 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) | |
1b637046 | 1512 | free_buf(buf, true); |
c446f8fc AS |
1513 | free_device: |
1514 | device_destroy(pdrvdata.class, port->dev->devt); | |
1515 | free_cdev: | |
d22a6989 | 1516 | cdev_del(port->cdev); |
c446f8fc AS |
1517 | free_port: |
1518 | kfree(port); | |
1519 | fail: | |
1520 | /* The host might want to notify management sw about port add failure */ | |
0643e4c6 | 1521 | __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
c446f8fc AS |
1522 | return err; |
1523 | } | |
1524 | ||
b353a6b8 AS |
1525 | /* No users remain, remove all port-specific data. */ |
1526 | static void remove_port(struct kref *kref) | |
1527 | { | |
1528 | struct port *port; | |
1529 | ||
1530 | port = container_of(kref, struct port, kref); | |
1531 | ||
b353a6b8 AS |
1532 | kfree(port); |
1533 | } | |
1534 | ||
a0e2dbfc AS |
1535 | static void remove_port_data(struct port *port) |
1536 | { | |
1537 | struct port_buffer *buf; | |
1538 | ||
c6017e79 | 1539 | spin_lock_irq(&port->inbuf_lock); |
a0e2dbfc AS |
1540 | /* Remove unused data this port might have received. */ |
1541 | discard_port_data(port); | |
34563769 | 1542 | spin_unlock_irq(&port->inbuf_lock); |
a0e2dbfc | 1543 | |
a0e2dbfc | 1544 | /* Remove buffers we queued up for the Host to send us data in. */ |
34563769 MR |
1545 | do { |
1546 | spin_lock_irq(&port->inbuf_lock); | |
1547 | buf = virtqueue_detach_unused_buf(port->in_vq); | |
1548 | spin_unlock_irq(&port->inbuf_lock); | |
1549 | if (buf) | |
1550 | free_buf(buf, true); | |
1551 | } while (buf); | |
c6017e79 AS |
1552 | |
1553 | spin_lock_irq(&port->outvq_lock); | |
1554 | reclaim_consumed_buffers(port); | |
34563769 | 1555 | spin_unlock_irq(&port->outvq_lock); |
eb34f12b | 1556 | |
1557 | /* Free pending buffers from the out-queue. */ | |
34563769 MR |
1558 | do { |
1559 | spin_lock_irq(&port->outvq_lock); | |
1560 | buf = virtqueue_detach_unused_buf(port->out_vq); | |
1561 | spin_unlock_irq(&port->outvq_lock); | |
1562 | if (buf) | |
1563 | free_buf(buf, true); | |
1564 | } while (buf); | |
a0e2dbfc AS |
1565 | } |
1566 | ||
b353a6b8 AS |
1567 | /* |
1568 | * Port got unplugged. Remove port from portdev's list and drop the | |
1569 | * kref reference. If no userspace has this port opened, it will | |
1570 | * result in immediate removal the port. | |
1571 | */ | |
1572 | static void unplug_port(struct port *port) | |
1f7aa42d | 1573 | { |
b353a6b8 AS |
1574 | spin_lock_irq(&port->portdev->ports_lock); |
1575 | list_del(&port->list); | |
1576 | spin_unlock_irq(&port->portdev->ports_lock); | |
1577 | ||
5549fb25 | 1578 | spin_lock_irq(&port->inbuf_lock); |
0047634d | 1579 | if (port->guest_connected) { |
92d34538 AS |
1580 | /* Let the app know the port is going down. */ |
1581 | send_sigio_to_port(port); | |
1582 | ||
1583 | /* Do this after sigio is actually sent */ | |
0047634d AS |
1584 | port->guest_connected = false; |
1585 | port->host_connected = false; | |
a461e11e | 1586 | |
92d34538 | 1587 | wake_up_interruptible(&port->waitqueue); |
0047634d | 1588 | } |
5549fb25 | 1589 | spin_unlock_irq(&port->inbuf_lock); |
0047634d | 1590 | |
1f7aa42d AS |
1591 | if (is_console_port(port)) { |
1592 | spin_lock_irq(&pdrvdata_lock); | |
1593 | list_del(&port->cons.list); | |
1594 | spin_unlock_irq(&pdrvdata_lock); | |
1595 | hvc_remove(port->cons.hvc); | |
1596 | } | |
1f7aa42d | 1597 | |
a0e2dbfc | 1598 | remove_port_data(port); |
a9cdd485 | 1599 | |
b353a6b8 AS |
1600 | /* |
1601 | * We should just assume the device itself has gone off -- | |
1602 | * else a close on an open port later will try to send out a | |
1603 | * control message. | |
1604 | */ | |
1605 | port->portdev = NULL; | |
d99393ef | 1606 | |
ea3768b4 AS |
1607 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); |
1608 | device_destroy(pdrvdata.class, port->dev->devt); | |
1609 | cdev_del(port->cdev); | |
1610 | ||
ea3768b4 | 1611 | debugfs_remove(port->debugfs_file); |
3b868a40 | 1612 | kfree(port->name); |
ea3768b4 | 1613 | |
b353a6b8 AS |
1614 | /* |
1615 | * Locks around here are not necessary - a port can't be | |
1616 | * opened after we removed the port struct from ports_list | |
1617 | * above. | |
1618 | */ | |
1619 | kref_put(&port->kref, remove_port); | |
1f7aa42d AS |
1620 | } |
1621 | ||
17634ba2 | 1622 | /* Any private messages that the Host and Guest want to share */ |
1f0f9106 MT |
1623 | static void handle_control_message(struct virtio_device *vdev, |
1624 | struct ports_device *portdev, | |
17634ba2 AS |
1625 | struct port_buffer *buf) |
1626 | { | |
1627 | struct virtio_console_control *cpkt; | |
1628 | struct port *port; | |
431edb8a AS |
1629 | size_t name_size; |
1630 | int err; | |
17634ba2 AS |
1631 | |
1632 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
1633 | ||
1f0f9106 MT |
1634 | port = find_port_by_id(portdev, virtio32_to_cpu(vdev, cpkt->id)); |
1635 | if (!port && | |
1636 | cpkt->event != cpu_to_virtio16(vdev, VIRTIO_CONSOLE_PORT_ADD)) { | |
17634ba2 AS |
1637 | /* No valid header at start of buffer. Drop it. */ |
1638 | dev_dbg(&portdev->vdev->dev, | |
1639 | "Invalid index %u in control packet\n", cpkt->id); | |
1640 | return; | |
1641 | } | |
1642 | ||
1f0f9106 | 1643 | switch (virtio16_to_cpu(vdev, cpkt->event)) { |
f909f850 AS |
1644 | case VIRTIO_CONSOLE_PORT_ADD: |
1645 | if (port) { | |
1d05160b AS |
1646 | dev_dbg(&portdev->vdev->dev, |
1647 | "Port %u already added\n", port->id); | |
f909f850 AS |
1648 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
1649 | break; | |
1650 | } | |
1f0f9106 | 1651 | if (virtio32_to_cpu(vdev, cpkt->id) >= |
7328fa64 | 1652 | portdev->max_nr_ports) { |
f909f850 | 1653 | dev_warn(&portdev->vdev->dev, |
1f0f9106 MT |
1654 | "Request for adding port with " |
1655 | "out-of-bound id %u, max. supported id: %u\n", | |
7328fa64 | 1656 | cpkt->id, portdev->max_nr_ports - 1); |
f909f850 AS |
1657 | break; |
1658 | } | |
1f0f9106 | 1659 | add_port(portdev, virtio32_to_cpu(vdev, cpkt->id)); |
f909f850 AS |
1660 | break; |
1661 | case VIRTIO_CONSOLE_PORT_REMOVE: | |
b353a6b8 | 1662 | unplug_port(port); |
f909f850 | 1663 | break; |
17634ba2 AS |
1664 | case VIRTIO_CONSOLE_CONSOLE_PORT: |
1665 | if (!cpkt->value) | |
1666 | break; | |
1667 | if (is_console_port(port)) | |
1668 | break; | |
1669 | ||
1670 | init_port_console(port); | |
5e38483b | 1671 | complete(&early_console_added); |
17634ba2 AS |
1672 | /* |
1673 | * Could remove the port here in case init fails - but | |
1674 | * have to notify the host first. | |
1675 | */ | |
1676 | break; | |
8345adbf AS |
1677 | case VIRTIO_CONSOLE_RESIZE: { |
1678 | struct { | |
1679 | __u16 rows; | |
1680 | __u16 cols; | |
1681 | } size; | |
1682 | ||
17634ba2 AS |
1683 | if (!is_console_port(port)) |
1684 | break; | |
8345adbf AS |
1685 | |
1686 | memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), | |
1687 | sizeof(size)); | |
1688 | set_console_size(port, size.rows, size.cols); | |
1689 | ||
17634ba2 AS |
1690 | port->cons.hvc->irq_requested = 1; |
1691 | resize_console(port); | |
1692 | break; | |
8345adbf | 1693 | } |
2030fa49 | 1694 | case VIRTIO_CONSOLE_PORT_OPEN: |
1f0f9106 | 1695 | port->host_connected = virtio16_to_cpu(vdev, cpkt->value); |
2030fa49 | 1696 | wake_up_interruptible(&port->waitqueue); |
cdfadfc1 AS |
1697 | /* |
1698 | * If the host port got closed and the host had any | |
1699 | * unconsumed buffers, we'll be able to reclaim them | |
1700 | * now. | |
1701 | */ | |
1702 | spin_lock_irq(&port->outvq_lock); | |
1703 | reclaim_consumed_buffers(port); | |
1704 | spin_unlock_irq(&port->outvq_lock); | |
3eae0ade AS |
1705 | |
1706 | /* | |
1707 | * If the guest is connected, it'll be interested in | |
1708 | * knowing the host connection state changed. | |
1709 | */ | |
314081f1 | 1710 | spin_lock_irq(&port->inbuf_lock); |
3eae0ade | 1711 | send_sigio_to_port(port); |
314081f1 | 1712 | spin_unlock_irq(&port->inbuf_lock); |
2030fa49 | 1713 | break; |
431edb8a | 1714 | case VIRTIO_CONSOLE_PORT_NAME: |
291024ef AS |
1715 | /* |
1716 | * If we woke up after hibernation, we can get this | |
1717 | * again. Skip it in that case. | |
1718 | */ | |
1719 | if (port->name) | |
1720 | break; | |
1721 | ||
431edb8a AS |
1722 | /* |
1723 | * Skip the size of the header and the cpkt to get the size | |
1724 | * of the name that was sent | |
1725 | */ | |
1726 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
1727 | ||
1728 | port->name = kmalloc(name_size, GFP_KERNEL); | |
1729 | if (!port->name) { | |
1730 | dev_err(port->dev, | |
1731 | "Not enough space to store port name\n"); | |
1732 | break; | |
1733 | } | |
1734 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
1735 | name_size - 1); | |
1736 | port->name[name_size - 1] = 0; | |
1737 | ||
1738 | /* | |
1739 | * Since we only have one sysfs attribute, 'name', | |
1740 | * create it only if we have a name for the port. | |
1741 | */ | |
1742 | err = sysfs_create_group(&port->dev->kobj, | |
1743 | &port_attribute_group); | |
ec64213c | 1744 | if (err) { |
431edb8a AS |
1745 | dev_err(port->dev, |
1746 | "Error %d creating sysfs device attributes\n", | |
1747 | err); | |
ec64213c AS |
1748 | } else { |
1749 | /* | |
1750 | * Generate a udev event so that appropriate | |
1751 | * symlinks can be created based on udev | |
1752 | * rules. | |
1753 | */ | |
1754 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
1755 | } | |
431edb8a | 1756 | break; |
17634ba2 AS |
1757 | } |
1758 | } | |
1759 | ||
1760 | static void control_work_handler(struct work_struct *work) | |
1761 | { | |
1762 | struct ports_device *portdev; | |
1763 | struct virtqueue *vq; | |
1764 | struct port_buffer *buf; | |
1765 | unsigned int len; | |
1766 | ||
1767 | portdev = container_of(work, struct ports_device, control_work); | |
1768 | vq = portdev->c_ivq; | |
1769 | ||
165b1b8b | 1770 | spin_lock(&portdev->c_ivq_lock); |
505b0451 | 1771 | while ((buf = virtqueue_get_buf(vq, &len))) { |
165b1b8b | 1772 | spin_unlock(&portdev->c_ivq_lock); |
17634ba2 AS |
1773 | |
1774 | buf->len = len; | |
1775 | buf->offset = 0; | |
1776 | ||
1f0f9106 | 1777 | handle_control_message(vq->vdev, portdev, buf); |
17634ba2 | 1778 | |
165b1b8b | 1779 | spin_lock(&portdev->c_ivq_lock); |
17634ba2 AS |
1780 | if (add_inbuf(portdev->c_ivq, buf) < 0) { |
1781 | dev_warn(&portdev->vdev->dev, | |
1782 | "Error adding buffer to queue\n"); | |
1b637046 | 1783 | free_buf(buf, false); |
17634ba2 AS |
1784 | } |
1785 | } | |
165b1b8b | 1786 | spin_unlock(&portdev->c_ivq_lock); |
17634ba2 AS |
1787 | } |
1788 | ||
2770c5ea AS |
1789 | static void out_intr(struct virtqueue *vq) |
1790 | { | |
1791 | struct port *port; | |
1792 | ||
1793 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1794 | if (!port) | |
1795 | return; | |
1796 | ||
1797 | wake_up_interruptible(&port->waitqueue); | |
1798 | } | |
1799 | ||
17634ba2 AS |
1800 | static void in_intr(struct virtqueue *vq) |
1801 | { | |
1802 | struct port *port; | |
1803 | unsigned long flags; | |
1804 | ||
1805 | port = find_port_by_vq(vq->vdev->priv, vq); | |
1806 | if (!port) | |
1807 | return; | |
1808 | ||
1809 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d25a9dda | 1810 | port->inbuf = get_inbuf(port); |
17634ba2 | 1811 | |
88f251ac | 1812 | /* |
aabd6a8f SB |
1813 | * Normally the port should not accept data when the port is |
1814 | * closed. For generic serial ports, the host won't (shouldn't) | |
1815 | * send data till the guest is connected. But this condition | |
88f251ac | 1816 | * can be reached when a console port is not yet connected (no |
aabd6a8f SB |
1817 | * tty is spawned) and the other side sends out data over the |
1818 | * vring, or when a remote devices start sending data before | |
1819 | * the ports are opened. | |
1820 | * | |
1821 | * A generic serial port will discard data if not connected, | |
1822 | * while console ports and rproc-serial ports accepts data at | |
1823 | * any time. rproc-serial is initiated with guest_connected to | |
1824 | * false because port_fops_open expects this. Console ports are | |
1825 | * hooked up with an HVC console and is initialized with | |
1826 | * guest_connected to true. | |
88f251ac | 1827 | */ |
aabd6a8f SB |
1828 | |
1829 | if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev)) | |
88f251ac AS |
1830 | discard_port_data(port); |
1831 | ||
314081f1 AS |
1832 | /* Send a SIGIO indicating new data in case the process asked for it */ |
1833 | send_sigio_to_port(port); | |
1834 | ||
17634ba2 AS |
1835 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1836 | ||
2030fa49 AS |
1837 | wake_up_interruptible(&port->waitqueue); |
1838 | ||
17634ba2 AS |
1839 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1840 | hvc_kick(); | |
1841 | } | |
1842 | ||
1843 | static void control_intr(struct virtqueue *vq) | |
1844 | { | |
1845 | struct ports_device *portdev; | |
1846 | ||
1847 | portdev = vq->vdev->priv; | |
1848 | schedule_work(&portdev->control_work); | |
1849 | } | |
1850 | ||
7f5d810d AS |
1851 | static void config_intr(struct virtio_device *vdev) |
1852 | { | |
1853 | struct ports_device *portdev; | |
1854 | ||
1855 | portdev = vdev->priv; | |
99f905f8 | 1856 | |
eeb8a7e8 MT |
1857 | if (!use_multiport(portdev)) |
1858 | schedule_work(&portdev->config_work); | |
1859 | } | |
1860 | ||
1861 | static void config_work_handler(struct work_struct *work) | |
1862 | { | |
1863 | struct ports_device *portdev; | |
1864 | ||
8379cadf | 1865 | portdev = container_of(work, struct ports_device, config_work); |
4038f5b7 | 1866 | if (!use_multiport(portdev)) { |
eeb8a7e8 | 1867 | struct virtio_device *vdev; |
9778829c AS |
1868 | struct port *port; |
1869 | u16 rows, cols; | |
1870 | ||
eeb8a7e8 | 1871 | vdev = portdev->vdev; |
855e0c52 RR |
1872 | virtio_cread(vdev, struct virtio_console_config, cols, &cols); |
1873 | virtio_cread(vdev, struct virtio_console_config, rows, &rows); | |
9778829c AS |
1874 | |
1875 | port = find_port_by_id(portdev, 0); | |
1876 | set_console_size(port, rows, cols); | |
1877 | ||
4038f5b7 AS |
1878 | /* |
1879 | * We'll use this way of resizing only for legacy | |
1880 | * support. For newer userspace | |
1881 | * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages | |
1882 | * to indicate console size changes so that it can be | |
1883 | * done per-port. | |
1884 | */ | |
9778829c | 1885 | resize_console(port); |
4038f5b7 | 1886 | } |
7f5d810d AS |
1887 | } |
1888 | ||
2658a79a AS |
1889 | static int init_vqs(struct ports_device *portdev) |
1890 | { | |
1891 | vq_callback_t **io_callbacks; | |
1892 | char **io_names; | |
1893 | struct virtqueue **vqs; | |
17634ba2 | 1894 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1895 | int err; |
1896 | ||
7328fa64 | 1897 | nr_ports = portdev->max_nr_ports; |
17634ba2 | 1898 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; |
2658a79a AS |
1899 | |
1900 | vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); | |
2658a79a | 1901 | io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); |
2658a79a | 1902 | io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); |
2658a79a AS |
1903 | portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1904 | GFP_KERNEL); | |
2658a79a AS |
1905 | portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
1906 | GFP_KERNEL); | |
22e132ff | 1907 | if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || |
286f9a22 | 1908 | !portdev->out_vqs) { |
2658a79a | 1909 | err = -ENOMEM; |
22e132ff | 1910 | goto free; |
2658a79a AS |
1911 | } |
1912 | ||
17634ba2 AS |
1913 | /* |
1914 | * For backward compat (newer host but older guest), the host | |
1915 | * spawns a console port first and also inits the vqs for port | |
1916 | * 0 before others. | |
1917 | */ | |
1918 | j = 0; | |
1919 | io_callbacks[j] = in_intr; | |
2770c5ea | 1920 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1921 | io_names[j] = "input"; |
1922 | io_names[j + 1] = "output"; | |
1923 | j += 2; | |
1924 | ||
1925 | if (use_multiport(portdev)) { | |
1926 | io_callbacks[j] = control_intr; | |
1927 | io_callbacks[j + 1] = NULL; | |
1928 | io_names[j] = "control-i"; | |
1929 | io_names[j + 1] = "control-o"; | |
1930 | ||
1931 | for (i = 1; i < nr_ports; i++) { | |
1932 | j += 2; | |
1933 | io_callbacks[j] = in_intr; | |
2770c5ea | 1934 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1935 | io_names[j] = "input"; |
1936 | io_names[j + 1] = "output"; | |
1937 | } | |
1938 | } | |
2658a79a AS |
1939 | /* Find the queues. */ |
1940 | err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, | |
1941 | io_callbacks, | |
1942 | (const char **)io_names); | |
1943 | if (err) | |
22e132ff | 1944 | goto free; |
2658a79a | 1945 | |
17634ba2 | 1946 | j = 0; |
2658a79a AS |
1947 | portdev->in_vqs[0] = vqs[0]; |
1948 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1949 | j += 2; |
1950 | if (use_multiport(portdev)) { | |
1951 | portdev->c_ivq = vqs[j]; | |
1952 | portdev->c_ovq = vqs[j + 1]; | |
1953 | ||
1954 | for (i = 1; i < nr_ports; i++) { | |
1955 | j += 2; | |
1956 | portdev->in_vqs[i] = vqs[j]; | |
1957 | portdev->out_vqs[i] = vqs[j + 1]; | |
1958 | } | |
1959 | } | |
2658a79a | 1960 | kfree(io_names); |
22e132ff | 1961 | kfree(io_callbacks); |
2658a79a AS |
1962 | kfree(vqs); |
1963 | ||
1964 | return 0; | |
1965 | ||
22e132ff | 1966 | free: |
2658a79a | 1967 | kfree(portdev->out_vqs); |
2658a79a | 1968 | kfree(portdev->in_vqs); |
22e132ff JS |
1969 | kfree(io_names); |
1970 | kfree(io_callbacks); | |
2658a79a | 1971 | kfree(vqs); |
22e132ff | 1972 | |
2658a79a AS |
1973 | return err; |
1974 | } | |
1975 | ||
fb08bd27 AS |
1976 | static const struct file_operations portdev_fops = { |
1977 | .owner = THIS_MODULE, | |
1978 | }; | |
1979 | ||
a0e2dbfc AS |
1980 | static void remove_vqs(struct ports_device *portdev) |
1981 | { | |
1982 | portdev->vdev->config->del_vqs(portdev->vdev); | |
1983 | kfree(portdev->in_vqs); | |
1984 | kfree(portdev->out_vqs); | |
1985 | } | |
1986 | ||
1987 | static void remove_controlq_data(struct ports_device *portdev) | |
1988 | { | |
1989 | struct port_buffer *buf; | |
1990 | unsigned int len; | |
1991 | ||
1992 | if (!use_multiport(portdev)) | |
1993 | return; | |
1994 | ||
1995 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) | |
1b637046 | 1996 | free_buf(buf, true); |
a0e2dbfc AS |
1997 | |
1998 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) | |
1b637046 | 1999 | free_buf(buf, true); |
a0e2dbfc AS |
2000 | } |
2001 | ||
1c85bf35 AS |
2002 | /* |
2003 | * Once we're further in boot, we get probed like any other virtio | |
2004 | * device. | |
17634ba2 AS |
2005 | * |
2006 | * If the host also supports multiple console ports, we check the | |
2007 | * config space to see how many ports the host has spawned. We | |
2008 | * initialize each port found. | |
1c85bf35 | 2009 | */ |
2223cbec | 2010 | static int virtcons_probe(struct virtio_device *vdev) |
1c85bf35 | 2011 | { |
1c85bf35 AS |
2012 | struct ports_device *portdev; |
2013 | int err; | |
17634ba2 | 2014 | bool multiport; |
5e38483b CB |
2015 | bool early = early_put_chars != NULL; |
2016 | ||
be8ff595 RR |
2017 | /* We only need a config space if features are offered */ |
2018 | if (!vdev->config->get && | |
2019 | (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE) | |
2020 | || virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT))) { | |
011f0e7a MT |
2021 | dev_err(&vdev->dev, "%s failure: config access disabled\n", |
2022 | __func__); | |
2023 | return -EINVAL; | |
2024 | } | |
2025 | ||
5e38483b CB |
2026 | /* Ensure to read early_put_chars now */ |
2027 | barrier(); | |
1c85bf35 AS |
2028 | |
2029 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
2030 | if (!portdev) { | |
2031 | err = -ENOMEM; | |
2032 | goto fail; | |
2033 | } | |
2034 | ||
2035 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
2036 | portdev->vdev = vdev; | |
2037 | vdev->priv = portdev; | |
2038 | ||
fb08bd27 AS |
2039 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", |
2040 | &portdev_fops); | |
2041 | if (portdev->chr_major < 0) { | |
2042 | dev_err(&vdev->dev, | |
2043 | "Error %d registering chrdev for device %u\n", | |
dc18f080 | 2044 | portdev->chr_major, vdev->index); |
fb08bd27 AS |
2045 | err = portdev->chr_major; |
2046 | goto free; | |
2047 | } | |
2048 | ||
17634ba2 | 2049 | multiport = false; |
7328fa64 | 2050 | portdev->max_nr_ports = 1; |
1b637046 SB |
2051 | |
2052 | /* Don't test MULTIPORT at all if we're rproc: not a valid feature! */ | |
2053 | if (!is_rproc_serial(vdev) && | |
855e0c52 RR |
2054 | virtio_cread_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT, |
2055 | struct virtio_console_config, max_nr_ports, | |
7328fa64 | 2056 | &portdev->max_nr_ports) == 0) { |
17634ba2 | 2057 | multiport = true; |
1b637046 | 2058 | } |
17634ba2 | 2059 | |
2658a79a AS |
2060 | err = init_vqs(portdev); |
2061 | if (err < 0) { | |
2062 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 2063 | goto free_chrdev; |
2658a79a | 2064 | } |
1c85bf35 | 2065 | |
17634ba2 AS |
2066 | spin_lock_init(&portdev->ports_lock); |
2067 | INIT_LIST_HEAD(&portdev->ports); | |
2068 | ||
65eca3a2 CH |
2069 | virtio_device_ready(portdev->vdev); |
2070 | ||
eeb8a7e8 | 2071 | INIT_WORK(&portdev->config_work, &config_work_handler); |
4f6e24ed MT |
2072 | INIT_WORK(&portdev->control_work, &control_work_handler); |
2073 | ||
17634ba2 | 2074 | if (multiport) { |
335a64a5 AS |
2075 | unsigned int nr_added_bufs; |
2076 | ||
165b1b8b | 2077 | spin_lock_init(&portdev->c_ivq_lock); |
9ba5c80b | 2078 | spin_lock_init(&portdev->c_ovq_lock); |
17634ba2 | 2079 | |
165b1b8b AS |
2080 | nr_added_bufs = fill_queue(portdev->c_ivq, |
2081 | &portdev->c_ivq_lock); | |
335a64a5 | 2082 | if (!nr_added_bufs) { |
22a29eac AS |
2083 | dev_err(&vdev->dev, |
2084 | "Error allocating buffers for control queue\n"); | |
2085 | err = -ENOMEM; | |
2086 | goto free_vqs; | |
2087 | } | |
1d05160b AS |
2088 | } else { |
2089 | /* | |
2090 | * For backward compatibility: Create a console port | |
2091 | * if we're running on older host. | |
2092 | */ | |
2093 | add_port(portdev, 0); | |
17634ba2 AS |
2094 | } |
2095 | ||
6bdf2afd AS |
2096 | spin_lock_irq(&pdrvdata_lock); |
2097 | list_add_tail(&portdev->list, &pdrvdata.portdevs); | |
2098 | spin_unlock_irq(&pdrvdata_lock); | |
2099 | ||
f909f850 AS |
2100 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
2101 | VIRTIO_CONSOLE_DEVICE_READY, 1); | |
5e38483b CB |
2102 | |
2103 | /* | |
2104 | * If there was an early virtio console, assume that there are no | |
2105 | * other consoles. We need to wait until the hvc_alloc matches the | |
2106 | * hvc_instantiate, otherwise tty_open will complain, resulting in | |
2107 | * a "Warning: unable to open an initial console" boot failure. | |
2108 | * Without multiport this is done in add_port above. With multiport | |
2109 | * this might take some host<->guest communication - thus we have to | |
2110 | * wait. | |
2111 | */ | |
2112 | if (multiport && early) | |
2113 | wait_for_completion(&early_console_added); | |
2114 | ||
31610434 RR |
2115 | return 0; |
2116 | ||
22a29eac | 2117 | free_vqs: |
0643e4c6 JL |
2118 | /* The host might want to notify mgmt sw about device add failure */ |
2119 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, | |
2120 | VIRTIO_CONSOLE_DEVICE_READY, 0); | |
a0e2dbfc | 2121 | remove_vqs(portdev); |
fb08bd27 AS |
2122 | free_chrdev: |
2123 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 2124 | free: |
1c85bf35 | 2125 | kfree(portdev); |
31610434 RR |
2126 | fail: |
2127 | return err; | |
2128 | } | |
2129 | ||
7177876f AS |
2130 | static void virtcons_remove(struct virtio_device *vdev) |
2131 | { | |
2132 | struct ports_device *portdev; | |
2133 | struct port *port, *port2; | |
7177876f AS |
2134 | |
2135 | portdev = vdev->priv; | |
2136 | ||
6bdf2afd AS |
2137 | spin_lock_irq(&pdrvdata_lock); |
2138 | list_del(&portdev->list); | |
2139 | spin_unlock_irq(&pdrvdata_lock); | |
2140 | ||
02238959 AS |
2141 | /* Disable interrupts for vqs */ |
2142 | vdev->config->reset(vdev); | |
2143 | /* Finish up work that's lined up */ | |
aded024a SB |
2144 | if (use_multiport(portdev)) |
2145 | cancel_work_sync(&portdev->control_work); | |
eeb8a7e8 MT |
2146 | else |
2147 | cancel_work_sync(&portdev->config_work); | |
7177876f AS |
2148 | |
2149 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
b353a6b8 | 2150 | unplug_port(port); |
7177876f AS |
2151 | |
2152 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
2153 | ||
e062013c AS |
2154 | /* |
2155 | * When yanking out a device, we immediately lose the | |
2156 | * (device-side) queues. So there's no point in keeping the | |
2157 | * guest side around till we drop our final reference. This | |
2158 | * also means that any ports which are in an open state will | |
2159 | * have to just stop using the port, as the vqs are going | |
2160 | * away. | |
2161 | */ | |
a0e2dbfc AS |
2162 | remove_controlq_data(portdev); |
2163 | remove_vqs(portdev); | |
7177876f AS |
2164 | kfree(portdev); |
2165 | } | |
2166 | ||
31610434 RR |
2167 | static struct virtio_device_id id_table[] = { |
2168 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
2169 | { 0 }, | |
2170 | }; | |
2171 | ||
c2983458 CB |
2172 | static unsigned int features[] = { |
2173 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 2174 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
2175 | }; |
2176 | ||
1b637046 SB |
2177 | static struct virtio_device_id rproc_serial_id_table[] = { |
2178 | #if IS_ENABLED(CONFIG_REMOTEPROC) | |
2179 | { VIRTIO_ID_RPROC_SERIAL, VIRTIO_DEV_ANY_ID }, | |
2180 | #endif | |
2181 | { 0 }, | |
2182 | }; | |
2183 | ||
2184 | static unsigned int rproc_serial_features[] = { | |
2185 | }; | |
2186 | ||
89107000 | 2187 | #ifdef CONFIG_PM_SLEEP |
2b8f41d8 AS |
2188 | static int virtcons_freeze(struct virtio_device *vdev) |
2189 | { | |
2190 | struct ports_device *portdev; | |
2191 | struct port *port; | |
2192 | ||
2193 | portdev = vdev->priv; | |
2194 | ||
2195 | vdev->config->reset(vdev); | |
2196 | ||
c743d09d | 2197 | virtqueue_disable_cb(portdev->c_ivq); |
2b8f41d8 | 2198 | cancel_work_sync(&portdev->control_work); |
eeb8a7e8 | 2199 | cancel_work_sync(&portdev->config_work); |
c743d09d AS |
2200 | /* |
2201 | * Once more: if control_work_handler() was running, it would | |
2202 | * enable the cb as the last step. | |
2203 | */ | |
2204 | virtqueue_disable_cb(portdev->c_ivq); | |
2b8f41d8 AS |
2205 | remove_controlq_data(portdev); |
2206 | ||
2207 | list_for_each_entry(port, &portdev->ports, list) { | |
c743d09d AS |
2208 | virtqueue_disable_cb(port->in_vq); |
2209 | virtqueue_disable_cb(port->out_vq); | |
2b8f41d8 AS |
2210 | /* |
2211 | * We'll ask the host later if the new invocation has | |
2212 | * the port opened or closed. | |
2213 | */ | |
2214 | port->host_connected = false; | |
2215 | remove_port_data(port); | |
2216 | } | |
2217 | remove_vqs(portdev); | |
2218 | ||
2219 | return 0; | |
2220 | } | |
2221 | ||
2222 | static int virtcons_restore(struct virtio_device *vdev) | |
2223 | { | |
2224 | struct ports_device *portdev; | |
2225 | struct port *port; | |
2226 | int ret; | |
2227 | ||
2228 | portdev = vdev->priv; | |
2229 | ||
2230 | ret = init_vqs(portdev); | |
2231 | if (ret) | |
2232 | return ret; | |
2233 | ||
401bbdc9 MT |
2234 | virtio_device_ready(portdev->vdev); |
2235 | ||
2b8f41d8 | 2236 | if (use_multiport(portdev)) |
165b1b8b | 2237 | fill_queue(portdev->c_ivq, &portdev->c_ivq_lock); |
2b8f41d8 AS |
2238 | |
2239 | list_for_each_entry(port, &portdev->ports, list) { | |
2240 | port->in_vq = portdev->in_vqs[port->id]; | |
2241 | port->out_vq = portdev->out_vqs[port->id]; | |
2242 | ||
2243 | fill_queue(port->in_vq, &port->inbuf_lock); | |
2244 | ||
2245 | /* Get port open/close status on the host */ | |
2246 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
fa8b66cc AS |
2247 | |
2248 | /* | |
2249 | * If a port was open at the time of suspending, we | |
2250 | * have to let the host know that it's still open. | |
2251 | */ | |
2252 | if (port->guest_connected) | |
2253 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
2b8f41d8 AS |
2254 | } |
2255 | return 0; | |
2256 | } | |
2257 | #endif | |
2258 | ||
31610434 | 2259 | static struct virtio_driver virtio_console = { |
c2983458 CB |
2260 | .feature_table = features, |
2261 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
2262 | .driver.name = KBUILD_MODNAME, |
2263 | .driver.owner = THIS_MODULE, | |
2264 | .id_table = id_table, | |
2265 | .probe = virtcons_probe, | |
7177876f | 2266 | .remove = virtcons_remove, |
7f5d810d | 2267 | .config_changed = config_intr, |
89107000 | 2268 | #ifdef CONFIG_PM_SLEEP |
2b8f41d8 AS |
2269 | .freeze = virtcons_freeze, |
2270 | .restore = virtcons_restore, | |
2271 | #endif | |
31610434 RR |
2272 | }; |
2273 | ||
bcd2982a | 2274 | static struct virtio_driver virtio_rproc_serial = { |
1b637046 SB |
2275 | .feature_table = rproc_serial_features, |
2276 | .feature_table_size = ARRAY_SIZE(rproc_serial_features), | |
2277 | .driver.name = "virtio_rproc_serial", | |
2278 | .driver.owner = THIS_MODULE, | |
2279 | .id_table = rproc_serial_id_table, | |
2280 | .probe = virtcons_probe, | |
2281 | .remove = virtcons_remove, | |
2282 | }; | |
2283 | ||
31610434 RR |
2284 | static int __init init(void) |
2285 | { | |
fb08bd27 AS |
2286 | int err; |
2287 | ||
2288 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
2289 | if (IS_ERR(pdrvdata.class)) { | |
2290 | err = PTR_ERR(pdrvdata.class); | |
2291 | pr_err("Error %d creating virtio-ports class\n", err); | |
2292 | return err; | |
2293 | } | |
d99393ef AS |
2294 | |
2295 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
3f0d0c9b DC |
2296 | if (!pdrvdata.debugfs_dir) |
2297 | pr_warning("Error creating debugfs dir for virtio-ports\n"); | |
38edf58d | 2298 | INIT_LIST_HEAD(&pdrvdata.consoles); |
6bdf2afd | 2299 | INIT_LIST_HEAD(&pdrvdata.portdevs); |
38edf58d | 2300 | |
33e1afc3 AK |
2301 | err = register_virtio_driver(&virtio_console); |
2302 | if (err < 0) { | |
2303 | pr_err("Error %d registering virtio driver\n", err); | |
2304 | goto free; | |
2305 | } | |
1b637046 SB |
2306 | err = register_virtio_driver(&virtio_rproc_serial); |
2307 | if (err < 0) { | |
2308 | pr_err("Error %d registering virtio rproc serial driver\n", | |
2309 | err); | |
2310 | goto unregister; | |
2311 | } | |
33e1afc3 | 2312 | return 0; |
1b637046 SB |
2313 | unregister: |
2314 | unregister_virtio_driver(&virtio_console); | |
33e1afc3 | 2315 | free: |
5885e48e | 2316 | debugfs_remove_recursive(pdrvdata.debugfs_dir); |
33e1afc3 AK |
2317 | class_destroy(pdrvdata.class); |
2318 | return err; | |
31610434 | 2319 | } |
7177876f AS |
2320 | |
2321 | static void __exit fini(void) | |
2322 | { | |
1b637046 SB |
2323 | reclaim_dma_bufs(); |
2324 | ||
7177876f | 2325 | unregister_virtio_driver(&virtio_console); |
1b637046 | 2326 | unregister_virtio_driver(&virtio_rproc_serial); |
7177876f AS |
2327 | |
2328 | class_destroy(pdrvdata.class); | |
5885e48e | 2329 | debugfs_remove_recursive(pdrvdata.debugfs_dir); |
7177876f | 2330 | } |
31610434 | 2331 | module_init(init); |
7177876f | 2332 | module_exit(fini); |
31610434 RR |
2333 | |
2334 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2335 | MODULE_DESCRIPTION("Virtio console driver"); | |
2336 | MODULE_LICENSE("GPL"); |