Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
a23ea924 RR |
2 | /* |
3 | * Copyright (C) 2006, 2007, 2009 Rusty Russell, IBM Corporation | |
5084f893 AS |
4 | * Copyright (C) 2009, 2010, 2011 Red Hat, Inc. |
5 | * Copyright (C) 2009, 2010, 2011 Amit Shah <amit.shah@redhat.com> | |
31610434 | 6 | */ |
fb08bd27 | 7 | #include <linux/cdev.h> |
d99393ef | 8 | #include <linux/debugfs.h> |
5e38483b | 9 | #include <linux/completion.h> |
fb08bd27 | 10 | #include <linux/device.h> |
31610434 | 11 | #include <linux/err.h> |
a08fa92d | 12 | #include <linux/freezer.h> |
2030fa49 | 13 | #include <linux/fs.h> |
eb5e89fc MH |
14 | #include <linux/splice.h> |
15 | #include <linux/pagemap.h> | |
31610434 | 16 | #include <linux/init.h> |
38edf58d | 17 | #include <linux/list.h> |
2030fa49 AS |
18 | #include <linux/poll.h> |
19 | #include <linux/sched.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
38edf58d | 21 | #include <linux/spinlock.h> |
31610434 RR |
22 | #include <linux/virtio.h> |
23 | #include <linux/virtio_console.h> | |
2030fa49 | 24 | #include <linux/wait.h> |
17634ba2 | 25 | #include <linux/workqueue.h> |
c22405c9 | 26 | #include <linux/module.h> |
1b637046 | 27 | #include <linux/dma-mapping.h> |
51df0acc | 28 | #include "../tty/hvc/hvc_console.h" |
31610434 | 29 | |
1b637046 SB |
30 | #define is_rproc_enabled IS_ENABLED(CONFIG_REMOTEPROC) |
31 | ||
38edf58d AS |
32 | /* |
33 | * This is a global struct for storing common data for all the devices | |
34 | * this driver handles. | |
35 | * | |
36 | * Mainly, it has a linked list for all the consoles in one place so | |
37 | * that callbacks from hvc for get_chars(), put_chars() work properly | |
38 | * across multiple devices and multiple ports per device. | |
39 | */ | |
40 | struct ports_driver_data { | |
fb08bd27 AS |
41 | /* Used for registering chardevs */ |
42 | struct class *class; | |
43 | ||
d99393ef AS |
44 | /* Used for exporting per-port information to debugfs */ |
45 | struct dentry *debugfs_dir; | |
46 | ||
6bdf2afd AS |
47 | /* List of all the devices we're handling */ |
48 | struct list_head portdevs; | |
49 | ||
d8a02bd5 RR |
50 | /* |
51 | * This is used to keep track of the number of hvc consoles | |
52 | * spawned by this driver. This number is given as the first | |
53 | * argument to hvc_alloc(). To correctly map an initial | |
54 | * console spawned via hvc_instantiate to the console being | |
55 | * hooked up via hvc_alloc, we need to pass the same vtermno. | |
56 | * | |
57 | * We also just assume the first console being initialised was | |
58 | * the first one that got used as the initial console. | |
59 | */ | |
60 | unsigned int next_vtermno; | |
61 | ||
38edf58d AS |
62 | /* All the console devices handled by this driver */ |
63 | struct list_head consoles; | |
64 | }; | |
4b0a2c5f | 65 | static struct ports_driver_data pdrvdata = { .next_vtermno = 1}; |
38edf58d | 66 | |
3826835a WY |
67 | static DEFINE_SPINLOCK(pdrvdata_lock); |
68 | static DECLARE_COMPLETION(early_console_added); | |
38edf58d | 69 | |
4f23c573 AS |
70 | /* This struct holds information that's relevant only for console ports */ |
71 | struct console { | |
72 | /* We'll place all consoles in a list in the pdrvdata struct */ | |
73 | struct list_head list; | |
74 | ||
75 | /* The hvc device associated with this console port */ | |
76 | struct hvc_struct *hvc; | |
77 | ||
9778829c AS |
78 | /* The size of the console */ |
79 | struct winsize ws; | |
80 | ||
4f23c573 AS |
81 | /* |
82 | * This number identifies the number that we used to register | |
83 | * with hvc in hvc_instantiate() and hvc_alloc(); this is the | |
84 | * number passed on by the hvc callbacks to us to | |
85 | * differentiate between the other console ports handled by | |
86 | * this driver | |
87 | */ | |
88 | u32 vtermno; | |
89 | }; | |
90 | ||
fdb9a054 AS |
91 | struct port_buffer { |
92 | char *buf; | |
93 | ||
94 | /* size of the buffer in *buf above */ | |
95 | size_t size; | |
96 | ||
97 | /* used length of the buffer */ | |
98 | size_t len; | |
99 | /* offset in the buf from which to consume data */ | |
100 | size_t offset; | |
276a3e95 | 101 | |
1b637046 SB |
102 | /* DMA address of buffer */ |
103 | dma_addr_t dma; | |
104 | ||
105 | /* Device we got DMA memory from */ | |
106 | struct device *dev; | |
107 | ||
108 | /* List of pending dma buffers to free */ | |
109 | struct list_head list; | |
110 | ||
276a3e95 SB |
111 | /* If sgpages == 0 then buf is used */ |
112 | unsigned int sgpages; | |
113 | ||
114 | /* sg is used if spages > 0. sg must be the last in is struct */ | |
1031eb90 | 115 | struct scatterlist sg[]; |
fdb9a054 AS |
116 | }; |
117 | ||
17634ba2 AS |
118 | /* |
119 | * This is a per-device struct that stores data common to all the | |
120 | * ports for that device (vdev->priv). | |
121 | */ | |
122 | struct ports_device { | |
6bdf2afd AS |
123 | /* Next portdev in the list, head is in the pdrvdata struct */ |
124 | struct list_head list; | |
125 | ||
17634ba2 AS |
126 | /* |
127 | * Workqueue handlers where we process deferred work after | |
128 | * notification | |
129 | */ | |
130 | struct work_struct control_work; | |
eeb8a7e8 | 131 | struct work_struct config_work; |
17634ba2 AS |
132 | |
133 | struct list_head ports; | |
134 | ||
135 | /* To protect the list of ports */ | |
136 | spinlock_t ports_lock; | |
137 | ||
138 | /* To protect the vq operations for the control channel */ | |
165b1b8b | 139 | spinlock_t c_ivq_lock; |
9ba5c80b | 140 | spinlock_t c_ovq_lock; |
17634ba2 | 141 | |
7328fa64 MT |
142 | /* max. number of ports this device can hold */ |
143 | u32 max_nr_ports; | |
17634ba2 AS |
144 | |
145 | /* The virtio device we're associated with */ | |
146 | struct virtio_device *vdev; | |
147 | ||
148 | /* | |
149 | * A couple of virtqueues for the control channel: one for | |
150 | * guest->host transfers, one for host->guest transfers | |
151 | */ | |
152 | struct virtqueue *c_ivq, *c_ovq; | |
153 | ||
5e59d9a1 AL |
154 | /* |
155 | * A control packet buffer for guest->host requests, protected | |
156 | * by c_ovq_lock. | |
157 | */ | |
158 | struct virtio_console_control cpkt; | |
159 | ||
17634ba2 AS |
160 | /* Array of per-port IO virtqueues */ |
161 | struct virtqueue **in_vqs, **out_vqs; | |
fb08bd27 | 162 | |
fb08bd27 AS |
163 | /* Major number for this device. Ports will be created as minors. */ |
164 | int chr_major; | |
17634ba2 AS |
165 | }; |
166 | ||
17e5b4f2 AS |
167 | struct port_stats { |
168 | unsigned long bytes_sent, bytes_received, bytes_discarded; | |
169 | }; | |
170 | ||
1c85bf35 | 171 | /* This struct holds the per-port data */ |
21206ede | 172 | struct port { |
17634ba2 AS |
173 | /* Next port in the list, head is in the ports_device */ |
174 | struct list_head list; | |
175 | ||
1c85bf35 AS |
176 | /* Pointer to the parent virtio_console device */ |
177 | struct ports_device *portdev; | |
fdb9a054 AS |
178 | |
179 | /* The current buffer from which data has to be fed to readers */ | |
180 | struct port_buffer *inbuf; | |
21206ede | 181 | |
203baab8 AS |
182 | /* |
183 | * To protect the operations on the in_vq associated with this | |
184 | * port. Has to be a spinlock because it can be called from | |
185 | * interrupt context (get_char()). | |
186 | */ | |
187 | spinlock_t inbuf_lock; | |
188 | ||
cdfadfc1 AS |
189 | /* Protect the operations on the out_vq. */ |
190 | spinlock_t outvq_lock; | |
191 | ||
1c85bf35 AS |
192 | /* The IO vqs for this port */ |
193 | struct virtqueue *in_vq, *out_vq; | |
194 | ||
d99393ef AS |
195 | /* File in the debugfs directory that exposes this port's information */ |
196 | struct dentry *debugfs_file; | |
197 | ||
17e5b4f2 AS |
198 | /* |
199 | * Keep count of the bytes sent, received and discarded for | |
200 | * this port for accounting and debugging purposes. These | |
201 | * counts are not reset across port open / close events. | |
202 | */ | |
203 | struct port_stats stats; | |
204 | ||
4f23c573 AS |
205 | /* |
206 | * The entries in this struct will be valid if this port is | |
207 | * hooked up to an hvc console | |
208 | */ | |
209 | struct console cons; | |
17634ba2 | 210 | |
fb08bd27 | 211 | /* Each port associates with a separate char device */ |
d22a6989 | 212 | struct cdev *cdev; |
fb08bd27 AS |
213 | struct device *dev; |
214 | ||
b353a6b8 AS |
215 | /* Reference-counting to handle port hot-unplugs and file operations */ |
216 | struct kref kref; | |
217 | ||
2030fa49 AS |
218 | /* A waitqueue for poll() or blocking read operations */ |
219 | wait_queue_head_t waitqueue; | |
220 | ||
431edb8a AS |
221 | /* The 'name' of the port that we expose via sysfs properties */ |
222 | char *name; | |
223 | ||
3eae0ade AS |
224 | /* We can notify apps of host connect / disconnect events via SIGIO */ |
225 | struct fasync_struct *async_queue; | |
226 | ||
17634ba2 AS |
227 | /* The 'id' to identify the port with the Host */ |
228 | u32 id; | |
2030fa49 | 229 | |
cdfadfc1 AS |
230 | bool outvq_full; |
231 | ||
2030fa49 AS |
232 | /* Is the host device open */ |
233 | bool host_connected; | |
3c7969cc AS |
234 | |
235 | /* We should allow only one process to open a port */ | |
236 | bool guest_connected; | |
21206ede | 237 | }; |
31610434 | 238 | |
971f3390 RR |
239 | /* This is the very early arch-specified put chars function. */ |
240 | static int (*early_put_chars)(u32, const char *, int); | |
241 | ||
38edf58d AS |
242 | static struct port *find_port_by_vtermno(u32 vtermno) |
243 | { | |
244 | struct port *port; | |
4f23c573 | 245 | struct console *cons; |
38edf58d AS |
246 | unsigned long flags; |
247 | ||
248 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
4f23c573 AS |
249 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
250 | if (cons->vtermno == vtermno) { | |
251 | port = container_of(cons, struct port, cons); | |
38edf58d | 252 | goto out; |
4f23c573 | 253 | } |
38edf58d AS |
254 | } |
255 | port = NULL; | |
256 | out: | |
257 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
258 | return port; | |
259 | } | |
260 | ||
04950cdf AS |
261 | static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, |
262 | dev_t dev) | |
263 | { | |
264 | struct port *port; | |
265 | unsigned long flags; | |
266 | ||
267 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
057b82be AS |
268 | list_for_each_entry(port, &portdev->ports, list) { |
269 | if (port->cdev->dev == dev) { | |
270 | kref_get(&port->kref); | |
04950cdf | 271 | goto out; |
057b82be AS |
272 | } |
273 | } | |
04950cdf AS |
274 | port = NULL; |
275 | out: | |
276 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
277 | ||
278 | return port; | |
279 | } | |
280 | ||
281 | static struct port *find_port_by_devt(dev_t dev) | |
282 | { | |
283 | struct ports_device *portdev; | |
284 | struct port *port; | |
285 | unsigned long flags; | |
286 | ||
287 | spin_lock_irqsave(&pdrvdata_lock, flags); | |
288 | list_for_each_entry(portdev, &pdrvdata.portdevs, list) { | |
289 | port = find_port_by_devt_in_portdev(portdev, dev); | |
290 | if (port) | |
291 | goto out; | |
292 | } | |
293 | port = NULL; | |
294 | out: | |
295 | spin_unlock_irqrestore(&pdrvdata_lock, flags); | |
296 | return port; | |
297 | } | |
298 | ||
17634ba2 AS |
299 | static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
300 | { | |
301 | struct port *port; | |
302 | unsigned long flags; | |
303 | ||
304 | spin_lock_irqsave(&portdev->ports_lock, flags); | |
305 | list_for_each_entry(port, &portdev->ports, list) | |
306 | if (port->id == id) | |
307 | goto out; | |
308 | port = NULL; | |
309 | out: | |
310 | spin_unlock_irqrestore(&portdev->ports_lock, flags); | |
311 | ||
312 | return port; | |
313 | } | |
314 | ||
203baab8 AS |
315 | static struct port *find_port_by_vq(struct ports_device *portdev, |
316 | struct virtqueue *vq) | |
317 | { | |
318 | struct port *port; | |
203baab8 AS |
319 | unsigned long flags; |
320 | ||
17634ba2 AS |
321 | spin_lock_irqsave(&portdev->ports_lock, flags); |
322 | list_for_each_entry(port, &portdev->ports, list) | |
203baab8 AS |
323 | if (port->in_vq == vq || port->out_vq == vq) |
324 | goto out; | |
203baab8 AS |
325 | port = NULL; |
326 | out: | |
17634ba2 | 327 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
203baab8 AS |
328 | return port; |
329 | } | |
330 | ||
17634ba2 AS |
331 | static bool is_console_port(struct port *port) |
332 | { | |
333 | if (port->cons.hvc) | |
334 | return true; | |
335 | return false; | |
336 | } | |
337 | ||
1b637046 SB |
338 | static bool is_rproc_serial(const struct virtio_device *vdev) |
339 | { | |
340 | return is_rproc_enabled && vdev->id.device == VIRTIO_ID_RPROC_SERIAL; | |
341 | } | |
342 | ||
17634ba2 AS |
343 | static inline bool use_multiport(struct ports_device *portdev) |
344 | { | |
345 | /* | |
346 | * This condition can be true when put_chars is called from | |
347 | * early_init | |
348 | */ | |
349 | if (!portdev->vdev) | |
f580d730 | 350 | return false; |
e16e12be | 351 | return __virtio_test_bit(portdev->vdev, VIRTIO_CONSOLE_F_MULTIPORT); |
17634ba2 AS |
352 | } |
353 | ||
1b637046 SB |
354 | static DEFINE_SPINLOCK(dma_bufs_lock); |
355 | static LIST_HEAD(pending_free_dma_bufs); | |
356 | ||
357 | static void free_buf(struct port_buffer *buf, bool can_sleep) | |
fdb9a054 | 358 | { |
276a3e95 SB |
359 | unsigned int i; |
360 | ||
276a3e95 SB |
361 | for (i = 0; i < buf->sgpages; i++) { |
362 | struct page *page = sg_page(&buf->sg[i]); | |
363 | if (!page) | |
364 | break; | |
365 | put_page(page); | |
366 | } | |
367 | ||
1b637046 SB |
368 | if (!buf->dev) { |
369 | kfree(buf->buf); | |
370 | } else if (is_rproc_enabled) { | |
371 | unsigned long flags; | |
372 | ||
373 | /* dma_free_coherent requires interrupts to be enabled. */ | |
374 | if (!can_sleep) { | |
375 | /* queue up dma-buffers to be freed later */ | |
376 | spin_lock_irqsave(&dma_bufs_lock, flags); | |
377 | list_add_tail(&buf->list, &pending_free_dma_bufs); | |
378 | spin_unlock_irqrestore(&dma_bufs_lock, flags); | |
379 | return; | |
380 | } | |
381 | dma_free_coherent(buf->dev, buf->size, buf->buf, buf->dma); | |
382 | ||
383 | /* Release device refcnt and allow it to be freed */ | |
384 | put_device(buf->dev); | |
385 | } | |
386 | ||
fdb9a054 AS |
387 | kfree(buf); |
388 | } | |
389 | ||
1b637046 SB |
390 | static void reclaim_dma_bufs(void) |
391 | { | |
392 | unsigned long flags; | |
393 | struct port_buffer *buf, *tmp; | |
394 | LIST_HEAD(tmp_list); | |
395 | ||
396 | if (list_empty(&pending_free_dma_bufs)) | |
397 | return; | |
398 | ||
399 | /* Create a copy of the pending_free_dma_bufs while holding the lock */ | |
400 | spin_lock_irqsave(&dma_bufs_lock, flags); | |
401 | list_cut_position(&tmp_list, &pending_free_dma_bufs, | |
402 | pending_free_dma_bufs.prev); | |
403 | spin_unlock_irqrestore(&dma_bufs_lock, flags); | |
404 | ||
405 | /* Release the dma buffers, without irqs enabled */ | |
406 | list_for_each_entry_safe(buf, tmp, &tmp_list, list) { | |
407 | list_del(&buf->list); | |
408 | free_buf(buf, true); | |
409 | } | |
410 | } | |
411 | ||
2855b335 | 412 | static struct port_buffer *alloc_buf(struct virtio_device *vdev, size_t buf_size, |
276a3e95 | 413 | int pages) |
fdb9a054 AS |
414 | { |
415 | struct port_buffer *buf; | |
416 | ||
1b637046 SB |
417 | reclaim_dma_bufs(); |
418 | ||
276a3e95 SB |
419 | /* |
420 | * Allocate buffer and the sg list. The sg list array is allocated | |
421 | * directly after the port_buffer struct. | |
422 | */ | |
5b572e25 | 423 | buf = kmalloc(struct_size(buf, sg, pages), GFP_KERNEL); |
fdb9a054 AS |
424 | if (!buf) |
425 | goto fail; | |
276a3e95 SB |
426 | |
427 | buf->sgpages = pages; | |
428 | if (pages > 0) { | |
1b637046 | 429 | buf->dev = NULL; |
276a3e95 SB |
430 | buf->buf = NULL; |
431 | return buf; | |
432 | } | |
433 | ||
2855b335 | 434 | if (is_rproc_serial(vdev)) { |
1b637046 SB |
435 | /* |
436 | * Allocate DMA memory from ancestor. When a virtio | |
437 | * device is created by remoteproc, the DMA memory is | |
438 | * associated with the grandparent device: | |
439 | * vdev => rproc => platform-dev. | |
1b637046 | 440 | */ |
2855b335 | 441 | if (!vdev->dev.parent || !vdev->dev.parent->parent) |
1b637046 | 442 | goto free_buf; |
2855b335 | 443 | buf->dev = vdev->dev.parent->parent; |
1b637046 SB |
444 | |
445 | /* Increase device refcnt to avoid freeing it */ | |
446 | get_device(buf->dev); | |
447 | buf->buf = dma_alloc_coherent(buf->dev, buf_size, &buf->dma, | |
448 | GFP_KERNEL); | |
449 | } else { | |
450 | buf->dev = NULL; | |
451 | buf->buf = kmalloc(buf_size, GFP_KERNEL); | |
452 | } | |
453 | ||
fdb9a054 AS |
454 | if (!buf->buf) |
455 | goto free_buf; | |
456 | buf->len = 0; | |
457 | buf->offset = 0; | |
458 | buf->size = buf_size; | |
459 | return buf; | |
460 | ||
461 | free_buf: | |
462 | kfree(buf); | |
463 | fail: | |
464 | return NULL; | |
465 | } | |
466 | ||
a3cde449 | 467 | /* Callers should take appropriate locks */ |
defde669 | 468 | static struct port_buffer *get_inbuf(struct port *port) |
a3cde449 AS |
469 | { |
470 | struct port_buffer *buf; | |
a3cde449 AS |
471 | unsigned int len; |
472 | ||
d25a9dda AS |
473 | if (port->inbuf) |
474 | return port->inbuf; | |
475 | ||
476 | buf = virtqueue_get_buf(port->in_vq, &len); | |
a3cde449 AS |
477 | if (buf) { |
478 | buf->len = len; | |
479 | buf->offset = 0; | |
17e5b4f2 | 480 | port->stats.bytes_received += len; |
a3cde449 AS |
481 | } |
482 | return buf; | |
483 | } | |
484 | ||
e27b5198 AS |
485 | /* |
486 | * Create a scatter-gather list representing our input buffer and put | |
487 | * it in the queue. | |
488 | * | |
489 | * Callers should take appropriate locks. | |
490 | */ | |
203baab8 | 491 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
e27b5198 AS |
492 | { |
493 | struct scatterlist sg[1]; | |
203baab8 | 494 | int ret; |
1c85bf35 | 495 | |
e27b5198 AS |
496 | sg_init_one(sg, buf->buf, buf->size); |
497 | ||
6797999d | 498 | ret = virtqueue_add_inbuf(vq, sg, 1, buf, GFP_ATOMIC); |
505b0451 | 499 | virtqueue_kick(vq); |
49e86f16 AS |
500 | if (!ret) |
501 | ret = vq->num_free; | |
203baab8 AS |
502 | return ret; |
503 | } | |
504 | ||
88f251ac AS |
505 | /* Discard any unread data this port has. Callers lockers. */ |
506 | static void discard_port_data(struct port *port) | |
507 | { | |
508 | struct port_buffer *buf; | |
2d24cdaa | 509 | unsigned int err; |
88f251ac | 510 | |
d7a62cd0 AS |
511 | if (!port->portdev) { |
512 | /* Device has been unplugged. vqs are already gone. */ | |
513 | return; | |
514 | } | |
2d24cdaa | 515 | buf = get_inbuf(port); |
88f251ac | 516 | |
ce072a0c | 517 | err = 0; |
d6933561 | 518 | while (buf) { |
17e5b4f2 | 519 | port->stats.bytes_discarded += buf->len - buf->offset; |
2d24cdaa | 520 | if (add_inbuf(port->in_vq, buf) < 0) { |
ce072a0c | 521 | err++; |
1b637046 | 522 | free_buf(buf, false); |
d6933561 | 523 | } |
2d24cdaa AS |
524 | port->inbuf = NULL; |
525 | buf = get_inbuf(port); | |
88f251ac | 526 | } |
ce072a0c | 527 | if (err) |
d6933561 | 528 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", |
ce072a0c | 529 | err); |
88f251ac AS |
530 | } |
531 | ||
203baab8 AS |
532 | static bool port_has_data(struct port *port) |
533 | { | |
534 | unsigned long flags; | |
535 | bool ret; | |
536 | ||
d25a9dda | 537 | ret = false; |
203baab8 | 538 | spin_lock_irqsave(&port->inbuf_lock, flags); |
d6933561 | 539 | port->inbuf = get_inbuf(port); |
d25a9dda | 540 | if (port->inbuf) |
d6933561 | 541 | ret = true; |
d25a9dda | 542 | |
203baab8 | 543 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
203baab8 AS |
544 | return ret; |
545 | } | |
546 | ||
3425e706 AS |
547 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
548 | unsigned int event, unsigned int value) | |
17634ba2 AS |
549 | { |
550 | struct scatterlist sg[1]; | |
17634ba2 | 551 | struct virtqueue *vq; |
604b2ad7 | 552 | unsigned int len; |
17634ba2 | 553 | |
3425e706 | 554 | if (!use_multiport(portdev)) |
17634ba2 AS |
555 | return 0; |
556 | ||
3425e706 | 557 | vq = portdev->c_ovq; |
17634ba2 | 558 | |
9ba5c80b | 559 | spin_lock(&portdev->c_ovq_lock); |
5e59d9a1 AL |
560 | |
561 | portdev->cpkt.id = cpu_to_virtio32(portdev->vdev, port_id); | |
562 | portdev->cpkt.event = cpu_to_virtio16(portdev->vdev, event); | |
563 | portdev->cpkt.value = cpu_to_virtio16(portdev->vdev, value); | |
564 | ||
565 | sg_init_one(sg, &portdev->cpkt, sizeof(struct virtio_console_control)); | |
566 | ||
567 | if (virtqueue_add_outbuf(vq, sg, 1, &portdev->cpkt, GFP_ATOMIC) == 0) { | |
505b0451 | 568 | virtqueue_kick(vq); |
40e4dc53 HG |
569 | while (!virtqueue_get_buf(vq, &len) |
570 | && !virtqueue_is_broken(vq)) | |
17634ba2 AS |
571 | cpu_relax(); |
572 | } | |
5e59d9a1 | 573 | |
9ba5c80b | 574 | spin_unlock(&portdev->c_ovq_lock); |
17634ba2 AS |
575 | return 0; |
576 | } | |
577 | ||
3425e706 AS |
578 | static ssize_t send_control_msg(struct port *port, unsigned int event, |
579 | unsigned int value) | |
580 | { | |
84ec06c5 AS |
581 | /* Did the port get unplugged before userspace closed it? */ |
582 | if (port->portdev) | |
583 | return __send_control_msg(port->portdev, port->id, event, value); | |
584 | return 0; | |
3425e706 AS |
585 | } |
586 | ||
eb5e89fc | 587 | |
cdfadfc1 AS |
588 | /* Callers must take the port->outvq_lock */ |
589 | static void reclaim_consumed_buffers(struct port *port) | |
590 | { | |
276a3e95 | 591 | struct port_buffer *buf; |
cdfadfc1 AS |
592 | unsigned int len; |
593 | ||
d7a62cd0 AS |
594 | if (!port->portdev) { |
595 | /* Device has been unplugged. vqs are already gone. */ | |
596 | return; | |
597 | } | |
276a3e95 | 598 | while ((buf = virtqueue_get_buf(port->out_vq, &len))) { |
1b637046 | 599 | free_buf(buf, false); |
cdfadfc1 AS |
600 | port->outvq_full = false; |
601 | } | |
602 | } | |
603 | ||
eb5e89fc MH |
604 | static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, |
605 | int nents, size_t in_count, | |
276a3e95 | 606 | void *data, bool nonblock) |
f997f00b | 607 | { |
f997f00b | 608 | struct virtqueue *out_vq; |
589575a2 | 609 | int err; |
cdfadfc1 | 610 | unsigned long flags; |
f997f00b AS |
611 | unsigned int len; |
612 | ||
613 | out_vq = port->out_vq; | |
614 | ||
cdfadfc1 AS |
615 | spin_lock_irqsave(&port->outvq_lock, flags); |
616 | ||
617 | reclaim_consumed_buffers(port); | |
618 | ||
6797999d | 619 | err = virtqueue_add_outbuf(out_vq, sg, nents, data, GFP_ATOMIC); |
f997f00b AS |
620 | |
621 | /* Tell Host to go! */ | |
505b0451 | 622 | virtqueue_kick(out_vq); |
f997f00b | 623 | |
589575a2 | 624 | if (err) { |
9ff4cfab | 625 | in_count = 0; |
cdfadfc1 | 626 | goto done; |
f997f00b AS |
627 | } |
628 | ||
589575a2 | 629 | if (out_vq->num_free == 0) |
cdfadfc1 AS |
630 | port->outvq_full = true; |
631 | ||
632 | if (nonblock) | |
633 | goto done; | |
634 | ||
635 | /* | |
636 | * Wait till the host acknowledges it pushed out the data we | |
531295e6 AS |
637 | * sent. This is done for data from the hvc_console; the tty |
638 | * operations are performed with spinlocks held so we can't | |
639 | * sleep here. An alternative would be to copy the data to a | |
640 | * buffer and relax the spinning requirement. The downside is | |
641 | * we need to kmalloc a GFP_ATOMIC buffer each time the | |
642 | * console driver writes something out. | |
cdfadfc1 | 643 | */ |
40e4dc53 HG |
644 | while (!virtqueue_get_buf(out_vq, &len) |
645 | && !virtqueue_is_broken(out_vq)) | |
f997f00b | 646 | cpu_relax(); |
cdfadfc1 AS |
647 | done: |
648 | spin_unlock_irqrestore(&port->outvq_lock, flags); | |
17e5b4f2 AS |
649 | |
650 | port->stats.bytes_sent += in_count; | |
cdfadfc1 AS |
651 | /* |
652 | * We're expected to return the amount of data we wrote -- all | |
653 | * of it | |
654 | */ | |
9ff4cfab | 655 | return in_count; |
f997f00b AS |
656 | } |
657 | ||
203baab8 AS |
658 | /* |
659 | * Give out the data that's requested from the buffer that we have | |
660 | * queued up. | |
661 | */ | |
48b36066 MT |
662 | static ssize_t fill_readbuf(struct port *port, char __user *out_buf, |
663 | size_t out_count, bool to_user) | |
203baab8 AS |
664 | { |
665 | struct port_buffer *buf; | |
666 | unsigned long flags; | |
667 | ||
668 | if (!out_count || !port_has_data(port)) | |
669 | return 0; | |
670 | ||
671 | buf = port->inbuf; | |
b766ceed | 672 | out_count = min(out_count, buf->len - buf->offset); |
203baab8 | 673 | |
b766ceed AS |
674 | if (to_user) { |
675 | ssize_t ret; | |
676 | ||
677 | ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); | |
678 | if (ret) | |
679 | return -EFAULT; | |
680 | } else { | |
48b36066 MT |
681 | memcpy((__force char *)out_buf, buf->buf + buf->offset, |
682 | out_count); | |
b766ceed | 683 | } |
203baab8 | 684 | |
203baab8 AS |
685 | buf->offset += out_count; |
686 | ||
687 | if (buf->offset == buf->len) { | |
688 | /* | |
689 | * We're done using all the data in this buffer. | |
690 | * Re-queue so that the Host can send us more data. | |
691 | */ | |
692 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
693 | port->inbuf = NULL; | |
694 | ||
695 | if (add_inbuf(port->in_vq, buf) < 0) | |
fb08bd27 | 696 | dev_warn(port->dev, "failed add_buf\n"); |
203baab8 AS |
697 | |
698 | spin_unlock_irqrestore(&port->inbuf_lock, flags); | |
699 | } | |
b766ceed | 700 | /* Return the number of bytes actually copied */ |
203baab8 | 701 | return out_count; |
e27b5198 AS |
702 | } |
703 | ||
2030fa49 | 704 | /* The condition that must be true for polling to end */ |
60caacd3 | 705 | static bool will_read_block(struct port *port) |
2030fa49 | 706 | { |
3709ea7a AS |
707 | if (!port->guest_connected) { |
708 | /* Port got hot-unplugged. Let's exit. */ | |
709 | return false; | |
710 | } | |
60caacd3 | 711 | return !port_has_data(port) && port->host_connected; |
2030fa49 AS |
712 | } |
713 | ||
cdfadfc1 AS |
714 | static bool will_write_block(struct port *port) |
715 | { | |
716 | bool ret; | |
717 | ||
60e5e0b8 AS |
718 | if (!port->guest_connected) { |
719 | /* Port got hot-unplugged. Let's exit. */ | |
720 | return false; | |
721 | } | |
cdfadfc1 AS |
722 | if (!port->host_connected) |
723 | return true; | |
724 | ||
725 | spin_lock_irq(&port->outvq_lock); | |
726 | /* | |
727 | * Check if the Host has consumed any buffers since we last | |
728 | * sent data (this is only applicable for nonblocking ports). | |
729 | */ | |
730 | reclaim_consumed_buffers(port); | |
731 | ret = port->outvq_full; | |
732 | spin_unlock_irq(&port->outvq_lock); | |
733 | ||
734 | return ret; | |
735 | } | |
736 | ||
2030fa49 AS |
737 | static ssize_t port_fops_read(struct file *filp, char __user *ubuf, |
738 | size_t count, loff_t *offp) | |
739 | { | |
740 | struct port *port; | |
741 | ssize_t ret; | |
742 | ||
743 | port = filp->private_data; | |
744 | ||
96f97a83 AS |
745 | /* Port is hot-unplugged. */ |
746 | if (!port->guest_connected) | |
747 | return -ENODEV; | |
748 | ||
2030fa49 AS |
749 | if (!port_has_data(port)) { |
750 | /* | |
751 | * If nothing's connected on the host just return 0 in | |
752 | * case of list_empty; this tells the userspace app | |
753 | * that there's no connection | |
754 | */ | |
755 | if (!port->host_connected) | |
756 | return 0; | |
757 | if (filp->f_flags & O_NONBLOCK) | |
758 | return -EAGAIN; | |
759 | ||
a08fa92d AS |
760 | ret = wait_event_freezable(port->waitqueue, |
761 | !will_read_block(port)); | |
2030fa49 AS |
762 | if (ret < 0) |
763 | return ret; | |
764 | } | |
96f97a83 | 765 | /* Port got hot-unplugged while we were waiting above. */ |
b3dddb9e AS |
766 | if (!port->guest_connected) |
767 | return -ENODEV; | |
2030fa49 AS |
768 | /* |
769 | * We could've received a disconnection message while we were | |
770 | * waiting for more data. | |
771 | * | |
772 | * This check is not clubbed in the if() statement above as we | |
773 | * might receive some data as well as the host could get | |
774 | * disconnected after we got woken up from our wait. So we | |
775 | * really want to give off whatever data we have and only then | |
776 | * check for host_connected. | |
777 | */ | |
778 | if (!port_has_data(port) && !port->host_connected) | |
779 | return 0; | |
780 | ||
781 | return fill_readbuf(port, ubuf, count, true); | |
782 | } | |
783 | ||
efe75d24 MH |
784 | static int wait_port_writable(struct port *port, bool nonblock) |
785 | { | |
786 | int ret; | |
787 | ||
788 | if (will_write_block(port)) { | |
789 | if (nonblock) | |
790 | return -EAGAIN; | |
791 | ||
792 | ret = wait_event_freezable(port->waitqueue, | |
793 | !will_write_block(port)); | |
794 | if (ret < 0) | |
795 | return ret; | |
796 | } | |
797 | /* Port got hot-unplugged. */ | |
798 | if (!port->guest_connected) | |
799 | return -ENODEV; | |
800 | ||
801 | return 0; | |
802 | } | |
803 | ||
2030fa49 AS |
804 | static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, |
805 | size_t count, loff_t *offp) | |
806 | { | |
807 | struct port *port; | |
276a3e95 | 808 | struct port_buffer *buf; |
2030fa49 | 809 | ssize_t ret; |
cdfadfc1 | 810 | bool nonblock; |
276a3e95 | 811 | struct scatterlist sg[1]; |
2030fa49 | 812 | |
65745422 AS |
813 | /* Userspace could be out to fool us */ |
814 | if (!count) | |
815 | return 0; | |
816 | ||
2030fa49 AS |
817 | port = filp->private_data; |
818 | ||
cdfadfc1 AS |
819 | nonblock = filp->f_flags & O_NONBLOCK; |
820 | ||
efe75d24 MH |
821 | ret = wait_port_writable(port, nonblock); |
822 | if (ret < 0) | |
823 | return ret; | |
cdfadfc1 | 824 | |
2030fa49 AS |
825 | count = min((size_t)(32 * 1024), count); |
826 | ||
2855b335 | 827 | buf = alloc_buf(port->portdev->vdev, count, 0); |
2030fa49 AS |
828 | if (!buf) |
829 | return -ENOMEM; | |
830 | ||
276a3e95 | 831 | ret = copy_from_user(buf->buf, ubuf, count); |
2030fa49 AS |
832 | if (ret) { |
833 | ret = -EFAULT; | |
834 | goto free_buf; | |
835 | } | |
836 | ||
531295e6 AS |
837 | /* |
838 | * We now ask send_buf() to not spin for generic ports -- we | |
839 | * can re-use the same code path that non-blocking file | |
840 | * descriptors take for blocking file descriptors since the | |
841 | * wait is already done and we're certain the write will go | |
842 | * through to the host. | |
843 | */ | |
844 | nonblock = true; | |
276a3e95 SB |
845 | sg_init_one(sg, buf->buf, count); |
846 | ret = __send_to_port(port, sg, 1, count, buf, nonblock); | |
cdfadfc1 AS |
847 | |
848 | if (nonblock && ret > 0) | |
849 | goto out; | |
850 | ||
2030fa49 | 851 | free_buf: |
1b637046 | 852 | free_buf(buf, true); |
cdfadfc1 | 853 | out: |
2030fa49 AS |
854 | return ret; |
855 | } | |
856 | ||
eb5e89fc MH |
857 | struct sg_list { |
858 | unsigned int n; | |
8ca84a50 | 859 | unsigned int size; |
eb5e89fc MH |
860 | size_t len; |
861 | struct scatterlist *sg; | |
862 | }; | |
863 | ||
864 | static int pipe_to_sg(struct pipe_inode_info *pipe, struct pipe_buffer *buf, | |
865 | struct splice_desc *sd) | |
866 | { | |
867 | struct sg_list *sgl = sd->u.data; | |
ec8fc870 | 868 | unsigned int offset, len; |
eb5e89fc | 869 | |
8ca84a50 | 870 | if (sgl->n == sgl->size) |
eb5e89fc MH |
871 | return 0; |
872 | ||
873 | /* Try lock this page */ | |
c928f642 | 874 | if (pipe_buf_try_steal(pipe, buf)) { |
eb5e89fc MH |
875 | /* Get reference and unlock page for moving */ |
876 | get_page(buf->page); | |
877 | unlock_page(buf->page); | |
878 | ||
879 | len = min(buf->len, sd->len); | |
880 | sg_set_page(&(sgl->sg[sgl->n]), buf->page, len, buf->offset); | |
ec8fc870 MH |
881 | } else { |
882 | /* Failback to copying a page */ | |
883 | struct page *page = alloc_page(GFP_KERNEL); | |
c9efe511 | 884 | char *src; |
ec8fc870 MH |
885 | |
886 | if (!page) | |
887 | return -ENOMEM; | |
ec8fc870 MH |
888 | |
889 | offset = sd->pos & ~PAGE_MASK; | |
890 | ||
891 | len = sd->len; | |
892 | if (len + offset > PAGE_SIZE) | |
893 | len = PAGE_SIZE - offset; | |
894 | ||
fbb32750 | 895 | src = kmap_atomic(buf->page); |
c9efe511 | 896 | memcpy(page_address(page) + offset, src + buf->offset, len); |
fbb32750 | 897 | kunmap_atomic(src); |
ec8fc870 MH |
898 | |
899 | sg_set_page(&(sgl->sg[sgl->n]), page, len, offset); | |
eb5e89fc | 900 | } |
ec8fc870 MH |
901 | sgl->n++; |
902 | sgl->len += len; | |
eb5e89fc MH |
903 | |
904 | return len; | |
905 | } | |
906 | ||
907 | /* Faster zero-copy write by splicing */ | |
908 | static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, | |
909 | struct file *filp, loff_t *ppos, | |
910 | size_t len, unsigned int flags) | |
911 | { | |
912 | struct port *port = filp->private_data; | |
913 | struct sg_list sgl; | |
914 | ssize_t ret; | |
276a3e95 | 915 | struct port_buffer *buf; |
eb5e89fc MH |
916 | struct splice_desc sd = { |
917 | .total_len = len, | |
918 | .flags = flags, | |
919 | .pos = *ppos, | |
920 | .u.data = &sgl, | |
921 | }; | |
8cefc107 | 922 | unsigned int occupancy; |
eb5e89fc | 923 | |
1b637046 SB |
924 | /* |
925 | * Rproc_serial does not yet support splice. To support splice | |
926 | * pipe_to_sg() must allocate dma-buffers and copy content from | |
927 | * regular pages to dma pages. And alloc_buf and free_buf must | |
928 | * support allocating and freeing such a list of dma-buffers. | |
929 | */ | |
930 | if (is_rproc_serial(port->out_vq->vdev)) | |
931 | return -EINVAL; | |
932 | ||
2b4fbf02 | 933 | pipe_lock(pipe); |
8cefc107 DH |
934 | ret = 0; |
935 | if (pipe_empty(pipe->head, pipe->tail)) | |
2b4fbf02 | 936 | goto error_out; |
68c034fe | 937 | |
efe75d24 MH |
938 | ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK); |
939 | if (ret < 0) | |
2b4fbf02 | 940 | goto error_out; |
efe75d24 | 941 | |
8cefc107 DH |
942 | occupancy = pipe_occupancy(pipe->head, pipe->tail); |
943 | buf = alloc_buf(port->portdev->vdev, 0, occupancy); | |
6a965666 | 944 | |
2b4fbf02 YY |
945 | if (!buf) { |
946 | ret = -ENOMEM; | |
947 | goto error_out; | |
948 | } | |
276a3e95 | 949 | |
eb5e89fc MH |
950 | sgl.n = 0; |
951 | sgl.len = 0; | |
8cefc107 | 952 | sgl.size = occupancy; |
276a3e95 | 953 | sgl.sg = buf->sg; |
8ca84a50 | 954 | sg_init_table(sgl.sg, sgl.size); |
eb5e89fc | 955 | ret = __splice_from_pipe(pipe, &sd, pipe_to_sg); |
2b4fbf02 | 956 | pipe_unlock(pipe); |
eb5e89fc | 957 | if (likely(ret > 0)) |
276a3e95 | 958 | ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true); |
eb5e89fc | 959 | |
fe529537 | 960 | if (unlikely(ret <= 0)) |
1b637046 | 961 | free_buf(buf, true); |
eb5e89fc | 962 | return ret; |
2b4fbf02 YY |
963 | |
964 | error_out: | |
965 | pipe_unlock(pipe); | |
966 | return ret; | |
eb5e89fc MH |
967 | } |
968 | ||
afc9a42b | 969 | static __poll_t port_fops_poll(struct file *filp, poll_table *wait) |
2030fa49 AS |
970 | { |
971 | struct port *port; | |
afc9a42b | 972 | __poll_t ret; |
2030fa49 AS |
973 | |
974 | port = filp->private_data; | |
975 | poll_wait(filp, &port->waitqueue, wait); | |
976 | ||
8529a504 AS |
977 | if (!port->guest_connected) { |
978 | /* Port got unplugged */ | |
a9a08845 | 979 | return EPOLLHUP; |
8529a504 | 980 | } |
2030fa49 | 981 | ret = 0; |
6df7aadc | 982 | if (!will_read_block(port)) |
a9a08845 | 983 | ret |= EPOLLIN | EPOLLRDNORM; |
cdfadfc1 | 984 | if (!will_write_block(port)) |
a9a08845 | 985 | ret |= EPOLLOUT; |
2030fa49 | 986 | if (!port->host_connected) |
a9a08845 | 987 | ret |= EPOLLHUP; |
2030fa49 AS |
988 | |
989 | return ret; | |
990 | } | |
991 | ||
b353a6b8 AS |
992 | static void remove_port(struct kref *kref); |
993 | ||
2030fa49 AS |
994 | static int port_fops_release(struct inode *inode, struct file *filp) |
995 | { | |
996 | struct port *port; | |
997 | ||
998 | port = filp->private_data; | |
999 | ||
1000 | /* Notify host of port being closed */ | |
1001 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); | |
1002 | ||
88f251ac | 1003 | spin_lock_irq(&port->inbuf_lock); |
3c7969cc AS |
1004 | port->guest_connected = false; |
1005 | ||
88f251ac AS |
1006 | discard_port_data(port); |
1007 | ||
1008 | spin_unlock_irq(&port->inbuf_lock); | |
1009 | ||
cdfadfc1 AS |
1010 | spin_lock_irq(&port->outvq_lock); |
1011 | reclaim_consumed_buffers(port); | |
1012 | spin_unlock_irq(&port->outvq_lock); | |
1013 | ||
1b637046 | 1014 | reclaim_dma_bufs(); |
b353a6b8 AS |
1015 | /* |
1016 | * Locks aren't necessary here as a port can't be opened after | |
1017 | * unplug, and if a port isn't unplugged, a kref would already | |
1018 | * exist for the port. Plus, taking ports_lock here would | |
1019 | * create a dependency on other locks taken by functions | |
1020 | * inside remove_port if we're the last holder of the port, | |
1021 | * creating many problems. | |
1022 | */ | |
1023 | kref_put(&port->kref, remove_port); | |
1024 | ||
2030fa49 AS |
1025 | return 0; |
1026 | } | |
1027 | ||
1028 | static int port_fops_open(struct inode *inode, struct file *filp) | |
1029 | { | |
1030 | struct cdev *cdev = inode->i_cdev; | |
1031 | struct port *port; | |
8ad37e83 | 1032 | int ret; |
2030fa49 | 1033 | |
057b82be | 1034 | /* We get the port with a kref here */ |
04950cdf | 1035 | port = find_port_by_devt(cdev->dev); |
671bdea2 AS |
1036 | if (!port) { |
1037 | /* Port was unplugged before we could proceed */ | |
1038 | return -ENXIO; | |
1039 | } | |
2030fa49 AS |
1040 | filp->private_data = port; |
1041 | ||
1042 | /* | |
1043 | * Don't allow opening of console port devices -- that's done | |
1044 | * via /dev/hvc | |
1045 | */ | |
8ad37e83 AS |
1046 | if (is_console_port(port)) { |
1047 | ret = -ENXIO; | |
1048 | goto out; | |
1049 | } | |
2030fa49 | 1050 | |
3c7969cc AS |
1051 | /* Allow only one process to open a particular port at a time */ |
1052 | spin_lock_irq(&port->inbuf_lock); | |
1053 | if (port->guest_connected) { | |
1054 | spin_unlock_irq(&port->inbuf_lock); | |
74ff582c | 1055 | ret = -EBUSY; |
8ad37e83 | 1056 | goto out; |
3c7969cc AS |
1057 | } |
1058 | ||
1059 | port->guest_connected = true; | |
1060 | spin_unlock_irq(&port->inbuf_lock); | |
1061 | ||
cdfadfc1 AS |
1062 | spin_lock_irq(&port->outvq_lock); |
1063 | /* | |
1064 | * There might be a chance that we missed reclaiming a few | |
1065 | * buffers in the window of the port getting previously closed | |
1066 | * and opening now. | |
1067 | */ | |
1068 | reclaim_consumed_buffers(port); | |
1069 | spin_unlock_irq(&port->outvq_lock); | |
1070 | ||
299fb61c AS |
1071 | nonseekable_open(inode, filp); |
1072 | ||
2030fa49 AS |
1073 | /* Notify host of port being opened */ |
1074 | send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1075 | ||
1076 | return 0; | |
8ad37e83 | 1077 | out: |
b353a6b8 | 1078 | kref_put(&port->kref, remove_port); |
8ad37e83 | 1079 | return ret; |
2030fa49 AS |
1080 | } |
1081 | ||
3eae0ade AS |
1082 | static int port_fops_fasync(int fd, struct file *filp, int mode) |
1083 | { | |
1084 | struct port *port; | |
1085 | ||
1086 | port = filp->private_data; | |
1087 | return fasync_helper(fd, filp, mode, &port->async_queue); | |
1088 | } | |
1089 | ||
2030fa49 AS |
1090 | /* |
1091 | * The file operations that we support: programs in the guest can open | |
1092 | * a console device, read from it, write to it, poll for data and | |
1093 | * close it. The devices are at | |
1094 | * /dev/vport<device number>p<port number> | |
1095 | */ | |
1096 | static const struct file_operations port_fops = { | |
1097 | .owner = THIS_MODULE, | |
1098 | .open = port_fops_open, | |
1099 | .read = port_fops_read, | |
1100 | .write = port_fops_write, | |
eb5e89fc | 1101 | .splice_write = port_fops_splice_write, |
2030fa49 AS |
1102 | .poll = port_fops_poll, |
1103 | .release = port_fops_release, | |
3eae0ade | 1104 | .fasync = port_fops_fasync, |
299fb61c | 1105 | .llseek = no_llseek, |
2030fa49 AS |
1106 | }; |
1107 | ||
a23ea924 RR |
1108 | /* |
1109 | * The put_chars() callback is pretty straightforward. | |
31610434 | 1110 | * |
a23ea924 RR |
1111 | * We turn the characters into a scatter-gather list, add it to the |
1112 | * output queue and then kick the Host. Then we sit here waiting for | |
1113 | * it to finish: inefficient in theory, but in practice | |
ecda85e7 | 1114 | * implementations will do it immediately. |
a23ea924 | 1115 | */ |
31610434 RR |
1116 | static int put_chars(u32 vtermno, const char *buf, int count) |
1117 | { | |
21206ede | 1118 | struct port *port; |
276a3e95 | 1119 | struct scatterlist sg[1]; |
c4baad50 OS |
1120 | void *data; |
1121 | int ret; | |
38edf58d | 1122 | |
162a689a FD |
1123 | if (unlikely(early_put_chars)) |
1124 | return early_put_chars(vtermno, buf, count); | |
1125 | ||
38edf58d AS |
1126 | port = find_port_by_vtermno(vtermno); |
1127 | if (!port) | |
6dc69f97 | 1128 | return -EPIPE; |
31610434 | 1129 | |
c4baad50 OS |
1130 | data = kmemdup(buf, count, GFP_ATOMIC); |
1131 | if (!data) | |
1132 | return -ENOMEM; | |
1133 | ||
1134 | sg_init_one(sg, data, count); | |
1135 | ret = __send_to_port(port, sg, 1, count, data, false); | |
1136 | kfree(data); | |
1137 | return ret; | |
31610434 RR |
1138 | } |
1139 | ||
a23ea924 RR |
1140 | /* |
1141 | * get_chars() is the callback from the hvc_console infrastructure | |
1142 | * when an interrupt is received. | |
31610434 | 1143 | * |
203baab8 AS |
1144 | * We call out to fill_readbuf that gets us the required data from the |
1145 | * buffers that are queued up. | |
a23ea924 | 1146 | */ |
31610434 RR |
1147 | static int get_chars(u32 vtermno, char *buf, int count) |
1148 | { | |
21206ede RR |
1149 | struct port *port; |
1150 | ||
6dc69f97 AS |
1151 | /* If we've not set up the port yet, we have no input to give. */ |
1152 | if (unlikely(early_put_chars)) | |
1153 | return 0; | |
1154 | ||
38edf58d AS |
1155 | port = find_port_by_vtermno(vtermno); |
1156 | if (!port) | |
6dc69f97 | 1157 | return -EPIPE; |
21206ede | 1158 | |
31610434 | 1159 | /* If we don't have an input queue yet, we can't get input. */ |
21206ede | 1160 | BUG_ON(!port->in_vq); |
31610434 | 1161 | |
48b36066 | 1162 | return fill_readbuf(port, (__force char __user *)buf, count, false); |
31610434 | 1163 | } |
31610434 | 1164 | |
cb06e367 | 1165 | static void resize_console(struct port *port) |
c2983458 | 1166 | { |
cb06e367 | 1167 | struct virtio_device *vdev; |
c2983458 | 1168 | |
2de16a49 | 1169 | /* The port could have been hot-unplugged */ |
9778829c | 1170 | if (!port || !is_console_port(port)) |
2de16a49 AS |
1171 | return; |
1172 | ||
cb06e367 | 1173 | vdev = port->portdev->vdev; |
1b637046 SB |
1174 | |
1175 | /* Don't test F_SIZE at all if we're rproc: not a valid feature! */ | |
1176 | if (!is_rproc_serial(vdev) && | |
1177 | virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) | |
9778829c | 1178 | hvc_resize(port->cons.hvc, port->cons.ws); |
c2983458 CB |
1179 | } |
1180 | ||
38edf58d | 1181 | /* We set the configuration at this point, since we now have a tty */ |
91fcad19 CB |
1182 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
1183 | { | |
38edf58d AS |
1184 | struct port *port; |
1185 | ||
1186 | port = find_port_by_vtermno(hp->vtermno); | |
1187 | if (!port) | |
1188 | return -EINVAL; | |
1189 | ||
91fcad19 | 1190 | hp->irq_requested = 1; |
cb06e367 | 1191 | resize_console(port); |
c2983458 | 1192 | |
91fcad19 CB |
1193 | return 0; |
1194 | } | |
1195 | ||
1196 | static void notifier_del_vio(struct hvc_struct *hp, int data) | |
1197 | { | |
1198 | hp->irq_requested = 0; | |
1199 | } | |
1200 | ||
17634ba2 | 1201 | /* The operations for console ports. */ |
1dff3996 | 1202 | static const struct hv_ops hv_ops = { |
971f3390 RR |
1203 | .get_chars = get_chars, |
1204 | .put_chars = put_chars, | |
1205 | .notifier_add = notifier_add_vio, | |
1206 | .notifier_del = notifier_del_vio, | |
1207 | .notifier_hangup = notifier_del_vio, | |
1208 | }; | |
1209 | ||
1210 | /* | |
1211 | * Console drivers are initialized very early so boot messages can go | |
1212 | * out, so we do things slightly differently from the generic virtio | |
1213 | * initialization of the net and block drivers. | |
1214 | * | |
1215 | * At this stage, the console is output-only. It's too early to set | |
1216 | * up a virtqueue, so we let the drivers do some boutique early-output | |
1217 | * thing. | |
1218 | */ | |
1219 | int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) | |
1220 | { | |
1221 | early_put_chars = put_chars; | |
1222 | return hvc_instantiate(0, 0, &hv_ops); | |
1223 | } | |
1224 | ||
3826835a | 1225 | static int init_port_console(struct port *port) |
cfa6d379 AS |
1226 | { |
1227 | int ret; | |
1228 | ||
1229 | /* | |
1230 | * The Host's telling us this port is a console port. Hook it | |
1231 | * up with an hvc console. | |
1232 | * | |
1233 | * To set up and manage our virtual console, we call | |
1234 | * hvc_alloc(). | |
1235 | * | |
1236 | * The first argument of hvc_alloc() is the virtual console | |
1237 | * number. The second argument is the parameter for the | |
1238 | * notification mechanism (like irq number). We currently | |
1239 | * leave this as zero, virtqueues have implicit notifications. | |
1240 | * | |
1241 | * The third argument is a "struct hv_ops" containing the | |
1242 | * put_chars() get_chars(), notifier_add() and notifier_del() | |
1243 | * pointers. The final argument is the output buffer size: we | |
1244 | * can do any size, so we put PAGE_SIZE here. | |
1245 | */ | |
1246 | port->cons.vtermno = pdrvdata.next_vtermno; | |
1247 | ||
1248 | port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); | |
1249 | if (IS_ERR(port->cons.hvc)) { | |
1250 | ret = PTR_ERR(port->cons.hvc); | |
298add72 AS |
1251 | dev_err(port->dev, |
1252 | "error %d allocating hvc for port\n", ret); | |
cfa6d379 AS |
1253 | port->cons.hvc = NULL; |
1254 | return ret; | |
1255 | } | |
1256 | spin_lock_irq(&pdrvdata_lock); | |
1257 | pdrvdata.next_vtermno++; | |
1258 | list_add_tail(&port->cons.list, &pdrvdata.consoles); | |
1259 | spin_unlock_irq(&pdrvdata_lock); | |
3c7969cc | 1260 | port->guest_connected = true; |
cfa6d379 | 1261 | |
1d05160b AS |
1262 | /* |
1263 | * Start using the new console output if this is the first | |
1264 | * console to come up. | |
1265 | */ | |
1266 | if (early_put_chars) | |
1267 | early_put_chars = NULL; | |
1268 | ||
2030fa49 AS |
1269 | /* Notify host of port being opened */ |
1270 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
1271 | ||
cfa6d379 AS |
1272 | return 0; |
1273 | } | |
1274 | ||
431edb8a AS |
1275 | static ssize_t show_port_name(struct device *dev, |
1276 | struct device_attribute *attr, char *buffer) | |
1277 | { | |
1278 | struct port *port; | |
1279 | ||
1280 | port = dev_get_drvdata(dev); | |
1281 | ||
1282 | return sprintf(buffer, "%s\n", port->name); | |
1283 | } | |
1284 | ||
1285 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); | |
1286 | ||
1287 | static struct attribute *port_sysfs_entries[] = { | |
1288 | &dev_attr_name.attr, | |
1289 | NULL | |
1290 | }; | |
1291 | ||
ac317e27 | 1292 | static const struct attribute_group port_attribute_group = { |
431edb8a AS |
1293 | .name = NULL, /* put in device directory */ |
1294 | .attrs = port_sysfs_entries, | |
1295 | }; | |
1296 | ||
ddfa728a | 1297 | static int port_debugfs_show(struct seq_file *s, void *data) |
d99393ef | 1298 | { |
8d62fe94 TT |
1299 | struct port *port = s->private; |
1300 | ||
1301 | seq_printf(s, "name: %s\n", port->name ? port->name : ""); | |
1302 | seq_printf(s, "guest_connected: %d\n", port->guest_connected); | |
1303 | seq_printf(s, "host_connected: %d\n", port->host_connected); | |
1304 | seq_printf(s, "outvq_full: %d\n", port->outvq_full); | |
1305 | seq_printf(s, "bytes_sent: %lu\n", port->stats.bytes_sent); | |
1306 | seq_printf(s, "bytes_received: %lu\n", port->stats.bytes_received); | |
1307 | seq_printf(s, "bytes_discarded: %lu\n", port->stats.bytes_discarded); | |
1308 | seq_printf(s, "is_console: %s\n", | |
1309 | is_console_port(port) ? "yes" : "no"); | |
1310 | seq_printf(s, "console_vtermno: %u\n", port->cons.vtermno); | |
d99393ef | 1311 | |
8d62fe94 TT |
1312 | return 0; |
1313 | } | |
d99393ef | 1314 | |
ddfa728a | 1315 | DEFINE_SHOW_ATTRIBUTE(port_debugfs); |
d99393ef | 1316 | |
9778829c AS |
1317 | static void set_console_size(struct port *port, u16 rows, u16 cols) |
1318 | { | |
1319 | if (!port || !is_console_port(port)) | |
1320 | return; | |
1321 | ||
1322 | port->cons.ws.ws_row = rows; | |
1323 | port->cons.ws.ws_col = cols; | |
1324 | } | |
1325 | ||
d791cfcb | 1326 | static int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
c446f8fc AS |
1327 | { |
1328 | struct port_buffer *buf; | |
d791cfcb | 1329 | int nr_added_bufs; |
c446f8fc AS |
1330 | int ret; |
1331 | ||
1332 | nr_added_bufs = 0; | |
1333 | do { | |
2855b335 | 1334 | buf = alloc_buf(vq->vdev, PAGE_SIZE, 0); |
c446f8fc | 1335 | if (!buf) |
d791cfcb | 1336 | return -ENOMEM; |
c446f8fc AS |
1337 | |
1338 | spin_lock_irq(lock); | |
1339 | ret = add_inbuf(vq, buf); | |
1340 | if (ret < 0) { | |
1341 | spin_unlock_irq(lock); | |
1b637046 | 1342 | free_buf(buf, true); |
d791cfcb | 1343 | return ret; |
c446f8fc AS |
1344 | } |
1345 | nr_added_bufs++; | |
1346 | spin_unlock_irq(lock); | |
1347 | } while (ret > 0); | |
1348 | ||
1349 | return nr_added_bufs; | |
1350 | } | |
1351 | ||
3eae0ade AS |
1352 | static void send_sigio_to_port(struct port *port) |
1353 | { | |
1354 | if (port->async_queue && port->guest_connected) | |
1355 | kill_fasync(&port->async_queue, SIGIO, POLL_OUT); | |
1356 | } | |
1357 | ||
c446f8fc AS |
1358 | static int add_port(struct ports_device *portdev, u32 id) |
1359 | { | |
1360 | char debugfs_name[16]; | |
1361 | struct port *port; | |
c446f8fc | 1362 | dev_t devt; |
c446f8fc AS |
1363 | int err; |
1364 | ||
1365 | port = kmalloc(sizeof(*port), GFP_KERNEL); | |
1366 | if (!port) { | |
1367 | err = -ENOMEM; | |
1368 | goto fail; | |
1369 | } | |
b353a6b8 | 1370 | kref_init(&port->kref); |
c446f8fc AS |
1371 | |
1372 | port->portdev = portdev; | |
1373 | port->id = id; | |
1374 | ||
1375 | port->name = NULL; | |
1376 | port->inbuf = NULL; | |
1377 | port->cons.hvc = NULL; | |
3eae0ade | 1378 | port->async_queue = NULL; |
c446f8fc | 1379 | |
9778829c | 1380 | port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
4b0a2c5f | 1381 | port->cons.vtermno = 0; |
9778829c | 1382 | |
c446f8fc | 1383 | port->host_connected = port->guest_connected = false; |
17e5b4f2 | 1384 | port->stats = (struct port_stats) { 0 }; |
c446f8fc | 1385 | |
cdfadfc1 AS |
1386 | port->outvq_full = false; |
1387 | ||
c446f8fc AS |
1388 | port->in_vq = portdev->in_vqs[port->id]; |
1389 | port->out_vq = portdev->out_vqs[port->id]; | |
1390 | ||
d22a6989 AS |
1391 | port->cdev = cdev_alloc(); |
1392 | if (!port->cdev) { | |
1393 | dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); | |
1394 | err = -ENOMEM; | |
1395 | goto free_port; | |
1396 | } | |
1397 | port->cdev->ops = &port_fops; | |
c446f8fc AS |
1398 | |
1399 | devt = MKDEV(portdev->chr_major, id); | |
d22a6989 | 1400 | err = cdev_add(port->cdev, devt, 1); |
c446f8fc AS |
1401 | if (err < 0) { |
1402 | dev_err(&port->portdev->vdev->dev, | |
1403 | "Error %d adding cdev for port %u\n", err, id); | |
d22a6989 | 1404 | goto free_cdev; |
c446f8fc AS |
1405 | } |
1406 | port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, | |
1407 | devt, port, "vport%up%u", | |
dc18f080 | 1408 | port->portdev->vdev->index, id); |
c446f8fc AS |
1409 | if (IS_ERR(port->dev)) { |
1410 | err = PTR_ERR(port->dev); | |
1411 | dev_err(&port->portdev->vdev->dev, | |
1412 | "Error %d creating device for port %u\n", | |
1413 | err, id); | |
1414 | goto free_cdev; | |
1415 | } | |
1416 | ||
1417 | spin_lock_init(&port->inbuf_lock); | |
cdfadfc1 | 1418 | spin_lock_init(&port->outvq_lock); |
c446f8fc AS |
1419 | init_waitqueue_head(&port->waitqueue); |
1420 | ||
d791cfcb LV |
1421 | /* We can safely ignore ENOSPC because it means |
1422 | * the queue already has buffers. Buffers are removed | |
1423 | * only by virtcons_remove(), not by unplug_port() | |
1424 | */ | |
1425 | err = fill_queue(port->in_vq, &port->inbuf_lock); | |
1426 | if (err < 0 && err != -ENOSPC) { | |
c446f8fc | 1427 | dev_err(port->dev, "Error allocating inbufs\n"); |
c446f8fc AS |
1428 | goto free_device; |
1429 | } | |
1430 | ||
1b637046 SB |
1431 | if (is_rproc_serial(port->portdev->vdev)) |
1432 | /* | |
1433 | * For rproc_serial assume remote processor is connected. | |
1434 | * rproc_serial does not want the console port, only | |
1435 | * the generic port implementation. | |
1436 | */ | |
aabd6a8f | 1437 | port->host_connected = true; |
1b637046 SB |
1438 | else if (!use_multiport(port->portdev)) { |
1439 | /* | |
1440 | * If we're not using multiport support, | |
1441 | * this has to be a console port. | |
1442 | */ | |
c446f8fc AS |
1443 | err = init_port_console(port); |
1444 | if (err) | |
1445 | goto free_inbufs; | |
1446 | } | |
1447 | ||
1448 | spin_lock_irq(&portdev->ports_lock); | |
1449 | list_add_tail(&port->list, &port->portdev->ports); | |
1450 | spin_unlock_irq(&portdev->ports_lock); | |
1451 | ||
1452 | /* | |
1453 | * Tell the Host we're set so that it can send us various | |
1454 | * configuration parameters for this port (eg, port name, | |
1455 | * caching, whether this is a console port, etc.) | |
1456 | */ | |
1457 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
1458 | ||
1459 | if (pdrvdata.debugfs_dir) { | |
1460 | /* | |
1461 | * Finally, create the debugfs file that we can use to | |
1462 | * inspect a port's state at any time | |
1463 | */ | |
db170068 DC |
1464 | snprintf(debugfs_name, sizeof(debugfs_name), "vport%up%u", |
1465 | port->portdev->vdev->index, id); | |
c446f8fc AS |
1466 | port->debugfs_file = debugfs_create_file(debugfs_name, 0444, |
1467 | pdrvdata.debugfs_dir, | |
1468 | port, | |
ddfa728a | 1469 | &port_debugfs_fops); |
c446f8fc AS |
1470 | } |
1471 | return 0; | |
1472 | ||
1473 | free_inbufs: | |
c446f8fc AS |
1474 | free_device: |
1475 | device_destroy(pdrvdata.class, port->dev->devt); | |
1476 | free_cdev: | |
d22a6989 | 1477 | cdev_del(port->cdev); |
c446f8fc AS |
1478 | free_port: |
1479 | kfree(port); | |
1480 | fail: | |
1481 | /* The host might want to notify management sw about port add failure */ | |
0643e4c6 | 1482 | __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
c446f8fc AS |
1483 | return err; |
1484 | } | |
1485 | ||
b353a6b8 AS |
1486 | /* No users remain, remove all port-specific data. */ |
1487 | static void remove_port(struct kref *kref) | |
1488 | { | |
1489 | struct port *port; | |
1490 | ||
1491 | port = container_of(kref, struct port, kref); | |
1492 | ||
b353a6b8 AS |
1493 | kfree(port); |
1494 | } | |
1495 | ||
a0e2dbfc AS |
1496 | static void remove_port_data(struct port *port) |
1497 | { | |
c6017e79 | 1498 | spin_lock_irq(&port->inbuf_lock); |
a0e2dbfc AS |
1499 | /* Remove unused data this port might have received. */ |
1500 | discard_port_data(port); | |
34563769 | 1501 | spin_unlock_irq(&port->inbuf_lock); |
a0e2dbfc | 1502 | |
c6017e79 AS |
1503 | spin_lock_irq(&port->outvq_lock); |
1504 | reclaim_consumed_buffers(port); | |
34563769 | 1505 | spin_unlock_irq(&port->outvq_lock); |
a0e2dbfc AS |
1506 | } |
1507 | ||
b353a6b8 AS |
1508 | /* |
1509 | * Port got unplugged. Remove port from portdev's list and drop the | |
1510 | * kref reference. If no userspace has this port opened, it will | |
1511 | * result in immediate removal the port. | |
1512 | */ | |
1513 | static void unplug_port(struct port *port) | |
1f7aa42d | 1514 | { |
b353a6b8 AS |
1515 | spin_lock_irq(&port->portdev->ports_lock); |
1516 | list_del(&port->list); | |
1517 | spin_unlock_irq(&port->portdev->ports_lock); | |
1518 | ||
5549fb25 | 1519 | spin_lock_irq(&port->inbuf_lock); |
0047634d | 1520 | if (port->guest_connected) { |
92d34538 AS |
1521 | /* Let the app know the port is going down. */ |
1522 | send_sigio_to_port(port); | |
1523 | ||
1524 | /* Do this after sigio is actually sent */ | |
0047634d AS |
1525 | port->guest_connected = false; |
1526 | port->host_connected = false; | |
a461e11e | 1527 | |
92d34538 | 1528 | wake_up_interruptible(&port->waitqueue); |
0047634d | 1529 | } |
5549fb25 | 1530 | spin_unlock_irq(&port->inbuf_lock); |
0047634d | 1531 | |
1f7aa42d AS |
1532 | if (is_console_port(port)) { |
1533 | spin_lock_irq(&pdrvdata_lock); | |
1534 | list_del(&port->cons.list); | |
1535 | spin_unlock_irq(&pdrvdata_lock); | |
1536 | hvc_remove(port->cons.hvc); | |
1537 | } | |
1f7aa42d | 1538 | |
a0e2dbfc | 1539 | remove_port_data(port); |
a9cdd485 | 1540 | |
b353a6b8 AS |
1541 | /* |
1542 | * We should just assume the device itself has gone off -- | |
1543 | * else a close on an open port later will try to send out a | |
1544 | * control message. | |
1545 | */ | |
1546 | port->portdev = NULL; | |
d99393ef | 1547 | |
ea3768b4 AS |
1548 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); |
1549 | device_destroy(pdrvdata.class, port->dev->devt); | |
1550 | cdev_del(port->cdev); | |
1551 | ||
ea3768b4 | 1552 | debugfs_remove(port->debugfs_file); |
3b868a40 | 1553 | kfree(port->name); |
ea3768b4 | 1554 | |
b353a6b8 AS |
1555 | /* |
1556 | * Locks around here are not necessary - a port can't be | |
1557 | * opened after we removed the port struct from ports_list | |
1558 | * above. | |
1559 | */ | |
1560 | kref_put(&port->kref, remove_port); | |
1f7aa42d AS |
1561 | } |
1562 | ||
17634ba2 | 1563 | /* Any private messages that the Host and Guest want to share */ |
1f0f9106 MT |
1564 | static void handle_control_message(struct virtio_device *vdev, |
1565 | struct ports_device *portdev, | |
17634ba2 AS |
1566 | struct port_buffer *buf) |
1567 | { | |
1568 | struct virtio_console_control *cpkt; | |
1569 | struct port *port; | |
431edb8a AS |
1570 | size_t name_size; |
1571 | int err; | |
17634ba2 AS |
1572 | |
1573 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); | |
1574 | ||
1f0f9106 MT |
1575 | port = find_port_by_id(portdev, virtio32_to_cpu(vdev, cpkt->id)); |
1576 | if (!port && | |
1577 | cpkt->event != cpu_to_virtio16(vdev, VIRTIO_CONSOLE_PORT_ADD)) { | |
17634ba2 AS |
1578 | /* No valid header at start of buffer. Drop it. */ |
1579 | dev_dbg(&portdev->vdev->dev, | |
1580 | "Invalid index %u in control packet\n", cpkt->id); | |
1581 | return; | |
1582 | } | |
1583 | ||
1f0f9106 | 1584 | switch (virtio16_to_cpu(vdev, cpkt->event)) { |
f909f850 AS |
1585 | case VIRTIO_CONSOLE_PORT_ADD: |
1586 | if (port) { | |
1d05160b AS |
1587 | dev_dbg(&portdev->vdev->dev, |
1588 | "Port %u already added\n", port->id); | |
f909f850 AS |
1589 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
1590 | break; | |
1591 | } | |
1f0f9106 | 1592 | if (virtio32_to_cpu(vdev, cpkt->id) >= |
7328fa64 | 1593 | portdev->max_nr_ports) { |
f909f850 | 1594 | dev_warn(&portdev->vdev->dev, |
1f0f9106 MT |
1595 | "Request for adding port with " |
1596 | "out-of-bound id %u, max. supported id: %u\n", | |
7328fa64 | 1597 | cpkt->id, portdev->max_nr_ports - 1); |
f909f850 AS |
1598 | break; |
1599 | } | |
1f0f9106 | 1600 | add_port(portdev, virtio32_to_cpu(vdev, cpkt->id)); |
f909f850 AS |
1601 | break; |
1602 | case VIRTIO_CONSOLE_PORT_REMOVE: | |
b353a6b8 | 1603 | unplug_port(port); |
f909f850 | 1604 | break; |
17634ba2 AS |
1605 | case VIRTIO_CONSOLE_CONSOLE_PORT: |
1606 | if (!cpkt->value) | |
1607 | break; | |
1608 | if (is_console_port(port)) | |
1609 | break; | |
1610 | ||
1611 | init_port_console(port); | |
5e38483b | 1612 | complete(&early_console_added); |
17634ba2 AS |
1613 | /* |
1614 | * Could remove the port here in case init fails - but | |
1615 | * have to notify the host first. | |
1616 | */ | |
1617 | break; | |
8345adbf AS |
1618 | case VIRTIO_CONSOLE_RESIZE: { |
1619 | struct { | |
1620 | __u16 rows; | |
1621 | __u16 cols; | |
1622 | } size; | |
1623 | ||
17634ba2 AS |
1624 | if (!is_console_port(port)) |
1625 | break; | |
8345adbf AS |
1626 | |
1627 | memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), | |
1628 | sizeof(size)); | |
1629 | set_console_size(port, size.rows, size.cols); | |
1630 | ||
17634ba2 AS |
1631 | port->cons.hvc->irq_requested = 1; |
1632 | resize_console(port); | |
1633 | break; | |
8345adbf | 1634 | } |
2030fa49 | 1635 | case VIRTIO_CONSOLE_PORT_OPEN: |
1f0f9106 | 1636 | port->host_connected = virtio16_to_cpu(vdev, cpkt->value); |
2030fa49 | 1637 | wake_up_interruptible(&port->waitqueue); |
cdfadfc1 AS |
1638 | /* |
1639 | * If the host port got closed and the host had any | |
1640 | * unconsumed buffers, we'll be able to reclaim them | |
1641 | * now. | |
1642 | */ | |
1643 | spin_lock_irq(&port->outvq_lock); | |
1644 | reclaim_consumed_buffers(port); | |
1645 | spin_unlock_irq(&port->outvq_lock); | |
3eae0ade AS |
1646 | |
1647 | /* | |
1648 | * If the guest is connected, it'll be interested in | |
1649 | * knowing the host connection state changed. | |
1650 | */ | |
314081f1 | 1651 | spin_lock_irq(&port->inbuf_lock); |
3eae0ade | 1652 | send_sigio_to_port(port); |
314081f1 | 1653 | spin_unlock_irq(&port->inbuf_lock); |
2030fa49 | 1654 | break; |
431edb8a | 1655 | case VIRTIO_CONSOLE_PORT_NAME: |
291024ef AS |
1656 | /* |
1657 | * If we woke up after hibernation, we can get this | |
1658 | * again. Skip it in that case. | |
1659 | */ | |
1660 | if (port->name) | |
1661 | break; | |
1662 | ||
431edb8a AS |
1663 | /* |
1664 | * Skip the size of the header and the cpkt to get the size | |
1665 | * of the name that was sent | |
1666 | */ | |
1667 | name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; | |
1668 | ||
1669 | port->name = kmalloc(name_size, GFP_KERNEL); | |
1670 | if (!port->name) { | |
1671 | dev_err(port->dev, | |
1672 | "Not enough space to store port name\n"); | |
1673 | break; | |
1674 | } | |
1675 | strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), | |
1676 | name_size - 1); | |
1677 | port->name[name_size - 1] = 0; | |
1678 | ||
1679 | /* | |
1680 | * Since we only have one sysfs attribute, 'name', | |
1681 | * create it only if we have a name for the port. | |
1682 | */ | |
1683 | err = sysfs_create_group(&port->dev->kobj, | |
1684 | &port_attribute_group); | |
ec64213c | 1685 | if (err) { |
431edb8a AS |
1686 | dev_err(port->dev, |
1687 | "Error %d creating sysfs device attributes\n", | |
1688 | err); | |
ec64213c AS |
1689 | } else { |
1690 | /* | |
1691 | * Generate a udev event so that appropriate | |
1692 | * symlinks can be created based on udev | |
1693 | * rules. | |
1694 | */ | |
1695 | kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); | |
1696 | } | |
431edb8a | 1697 | break; |
17634ba2 AS |
1698 | } |
1699 | } | |
1700 | ||
1701 | static void control_work_handler(struct work_struct *work) | |
1702 | { | |
1703 | struct ports_device *portdev; | |
1704 | struct virtqueue *vq; | |
1705 | struct port_buffer *buf; | |
1706 | unsigned int len; | |
1707 | ||
1708 | portdev = container_of(work, struct ports_device, control_work); | |
1709 | vq = portdev->c_ivq; | |
1710 | ||
165b1b8b | 1711 | spin_lock(&portdev->c_ivq_lock); |
505b0451 | 1712 | while ((buf = virtqueue_get_buf(vq, &len))) { |
165b1b8b | 1713 | spin_unlock(&portdev->c_ivq_lock); |
17634ba2 AS |
1714 | |
1715 | buf->len = len; | |
1716 | buf->offset = 0; | |
1717 | ||
1f0f9106 | 1718 | handle_control_message(vq->vdev, portdev, buf); |
17634ba2 | 1719 | |
165b1b8b | 1720 | spin_lock(&portdev->c_ivq_lock); |
17634ba2 AS |
1721 | if (add_inbuf(portdev->c_ivq, buf) < 0) { |
1722 | dev_warn(&portdev->vdev->dev, | |
1723 | "Error adding buffer to queue\n"); | |
1b637046 | 1724 | free_buf(buf, false); |
17634ba2 AS |
1725 | } |
1726 | } | |
165b1b8b | 1727 | spin_unlock(&portdev->c_ivq_lock); |
17634ba2 AS |
1728 | } |
1729 | ||
a7a69ec0 MT |
1730 | static void flush_bufs(struct virtqueue *vq, bool can_sleep) |
1731 | { | |
1732 | struct port_buffer *buf; | |
1733 | unsigned int len; | |
1734 | ||
1735 | while ((buf = virtqueue_get_buf(vq, &len))) | |
1736 | free_buf(buf, can_sleep); | |
1737 | } | |
1738 | ||
2770c5ea AS |
1739 | static void out_intr(struct virtqueue *vq) |
1740 | { | |
1741 | struct port *port; | |
1742 | ||
1743 | port = find_port_by_vq(vq->vdev->priv, vq); | |
a7a69ec0 MT |
1744 | if (!port) { |
1745 | flush_bufs(vq, false); | |
2770c5ea | 1746 | return; |
a7a69ec0 | 1747 | } |
2770c5ea AS |
1748 | |
1749 | wake_up_interruptible(&port->waitqueue); | |
1750 | } | |
1751 | ||
17634ba2 AS |
1752 | static void in_intr(struct virtqueue *vq) |
1753 | { | |
1754 | struct port *port; | |
1755 | unsigned long flags; | |
1756 | ||
1757 | port = find_port_by_vq(vq->vdev->priv, vq); | |
a7a69ec0 MT |
1758 | if (!port) { |
1759 | flush_bufs(vq, false); | |
17634ba2 | 1760 | return; |
a7a69ec0 | 1761 | } |
17634ba2 AS |
1762 | |
1763 | spin_lock_irqsave(&port->inbuf_lock, flags); | |
d25a9dda | 1764 | port->inbuf = get_inbuf(port); |
17634ba2 | 1765 | |
88f251ac | 1766 | /* |
aabd6a8f SB |
1767 | * Normally the port should not accept data when the port is |
1768 | * closed. For generic serial ports, the host won't (shouldn't) | |
1769 | * send data till the guest is connected. But this condition | |
88f251ac | 1770 | * can be reached when a console port is not yet connected (no |
aabd6a8f SB |
1771 | * tty is spawned) and the other side sends out data over the |
1772 | * vring, or when a remote devices start sending data before | |
1773 | * the ports are opened. | |
1774 | * | |
1775 | * A generic serial port will discard data if not connected, | |
1776 | * while console ports and rproc-serial ports accepts data at | |
1777 | * any time. rproc-serial is initiated with guest_connected to | |
1778 | * false because port_fops_open expects this. Console ports are | |
1779 | * hooked up with an HVC console and is initialized with | |
1780 | * guest_connected to true. | |
88f251ac | 1781 | */ |
aabd6a8f SB |
1782 | |
1783 | if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev)) | |
88f251ac AS |
1784 | discard_port_data(port); |
1785 | ||
314081f1 AS |
1786 | /* Send a SIGIO indicating new data in case the process asked for it */ |
1787 | send_sigio_to_port(port); | |
1788 | ||
17634ba2 AS |
1789 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
1790 | ||
2030fa49 AS |
1791 | wake_up_interruptible(&port->waitqueue); |
1792 | ||
17634ba2 AS |
1793 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
1794 | hvc_kick(); | |
1795 | } | |
1796 | ||
1797 | static void control_intr(struct virtqueue *vq) | |
1798 | { | |
1799 | struct ports_device *portdev; | |
1800 | ||
1801 | portdev = vq->vdev->priv; | |
1802 | schedule_work(&portdev->control_work); | |
1803 | } | |
1804 | ||
7f5d810d AS |
1805 | static void config_intr(struct virtio_device *vdev) |
1806 | { | |
1807 | struct ports_device *portdev; | |
1808 | ||
1809 | portdev = vdev->priv; | |
99f905f8 | 1810 | |
eeb8a7e8 MT |
1811 | if (!use_multiport(portdev)) |
1812 | schedule_work(&portdev->config_work); | |
1813 | } | |
1814 | ||
1815 | static void config_work_handler(struct work_struct *work) | |
1816 | { | |
1817 | struct ports_device *portdev; | |
1818 | ||
8379cadf | 1819 | portdev = container_of(work, struct ports_device, config_work); |
4038f5b7 | 1820 | if (!use_multiport(portdev)) { |
eeb8a7e8 | 1821 | struct virtio_device *vdev; |
9778829c AS |
1822 | struct port *port; |
1823 | u16 rows, cols; | |
1824 | ||
eeb8a7e8 | 1825 | vdev = portdev->vdev; |
855e0c52 RR |
1826 | virtio_cread(vdev, struct virtio_console_config, cols, &cols); |
1827 | virtio_cread(vdev, struct virtio_console_config, rows, &rows); | |
9778829c AS |
1828 | |
1829 | port = find_port_by_id(portdev, 0); | |
1830 | set_console_size(port, rows, cols); | |
1831 | ||
4038f5b7 AS |
1832 | /* |
1833 | * We'll use this way of resizing only for legacy | |
1834 | * support. For newer userspace | |
1835 | * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages | |
1836 | * to indicate console size changes so that it can be | |
1837 | * done per-port. | |
1838 | */ | |
9778829c | 1839 | resize_console(port); |
4038f5b7 | 1840 | } |
7f5d810d AS |
1841 | } |
1842 | ||
2658a79a AS |
1843 | static int init_vqs(struct ports_device *portdev) |
1844 | { | |
1845 | vq_callback_t **io_callbacks; | |
1846 | char **io_names; | |
1847 | struct virtqueue **vqs; | |
17634ba2 | 1848 | u32 i, j, nr_ports, nr_queues; |
2658a79a AS |
1849 | int err; |
1850 | ||
7328fa64 | 1851 | nr_ports = portdev->max_nr_ports; |
17634ba2 | 1852 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; |
2658a79a | 1853 | |
6da2ec56 KC |
1854 | vqs = kmalloc_array(nr_queues, sizeof(struct virtqueue *), GFP_KERNEL); |
1855 | io_callbacks = kmalloc_array(nr_queues, sizeof(vq_callback_t *), | |
1856 | GFP_KERNEL); | |
1857 | io_names = kmalloc_array(nr_queues, sizeof(char *), GFP_KERNEL); | |
1858 | portdev->in_vqs = kmalloc_array(nr_ports, sizeof(struct virtqueue *), | |
1859 | GFP_KERNEL); | |
1860 | portdev->out_vqs = kmalloc_array(nr_ports, sizeof(struct virtqueue *), | |
1861 | GFP_KERNEL); | |
22e132ff | 1862 | if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || |
286f9a22 | 1863 | !portdev->out_vqs) { |
2658a79a | 1864 | err = -ENOMEM; |
22e132ff | 1865 | goto free; |
2658a79a AS |
1866 | } |
1867 | ||
17634ba2 AS |
1868 | /* |
1869 | * For backward compat (newer host but older guest), the host | |
1870 | * spawns a console port first and also inits the vqs for port | |
1871 | * 0 before others. | |
1872 | */ | |
1873 | j = 0; | |
1874 | io_callbacks[j] = in_intr; | |
2770c5ea | 1875 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1876 | io_names[j] = "input"; |
1877 | io_names[j + 1] = "output"; | |
1878 | j += 2; | |
1879 | ||
1880 | if (use_multiport(portdev)) { | |
1881 | io_callbacks[j] = control_intr; | |
1882 | io_callbacks[j + 1] = NULL; | |
1883 | io_names[j] = "control-i"; | |
1884 | io_names[j + 1] = "control-o"; | |
1885 | ||
1886 | for (i = 1; i < nr_ports; i++) { | |
1887 | j += 2; | |
1888 | io_callbacks[j] = in_intr; | |
2770c5ea | 1889 | io_callbacks[j + 1] = out_intr; |
17634ba2 AS |
1890 | io_names[j] = "input"; |
1891 | io_names[j + 1] = "output"; | |
1892 | } | |
1893 | } | |
2658a79a | 1894 | /* Find the queues. */ |
9b2bbdb2 MT |
1895 | err = virtio_find_vqs(portdev->vdev, nr_queues, vqs, |
1896 | io_callbacks, | |
1897 | (const char **)io_names, NULL); | |
2658a79a | 1898 | if (err) |
22e132ff | 1899 | goto free; |
2658a79a | 1900 | |
17634ba2 | 1901 | j = 0; |
2658a79a AS |
1902 | portdev->in_vqs[0] = vqs[0]; |
1903 | portdev->out_vqs[0] = vqs[1]; | |
17634ba2 AS |
1904 | j += 2; |
1905 | if (use_multiport(portdev)) { | |
1906 | portdev->c_ivq = vqs[j]; | |
1907 | portdev->c_ovq = vqs[j + 1]; | |
1908 | ||
1909 | for (i = 1; i < nr_ports; i++) { | |
1910 | j += 2; | |
1911 | portdev->in_vqs[i] = vqs[j]; | |
1912 | portdev->out_vqs[i] = vqs[j + 1]; | |
1913 | } | |
1914 | } | |
2658a79a | 1915 | kfree(io_names); |
22e132ff | 1916 | kfree(io_callbacks); |
2658a79a AS |
1917 | kfree(vqs); |
1918 | ||
1919 | return 0; | |
1920 | ||
22e132ff | 1921 | free: |
2658a79a | 1922 | kfree(portdev->out_vqs); |
2658a79a | 1923 | kfree(portdev->in_vqs); |
22e132ff JS |
1924 | kfree(io_names); |
1925 | kfree(io_callbacks); | |
2658a79a | 1926 | kfree(vqs); |
22e132ff | 1927 | |
2658a79a AS |
1928 | return err; |
1929 | } | |
1930 | ||
fb08bd27 AS |
1931 | static const struct file_operations portdev_fops = { |
1932 | .owner = THIS_MODULE, | |
1933 | }; | |
1934 | ||
a0e2dbfc AS |
1935 | static void remove_vqs(struct ports_device *portdev) |
1936 | { | |
a7a69ec0 MT |
1937 | struct virtqueue *vq; |
1938 | ||
1939 | virtio_device_for_each_vq(portdev->vdev, vq) { | |
1940 | struct port_buffer *buf; | |
1941 | ||
1942 | flush_bufs(vq, true); | |
1943 | while ((buf = virtqueue_detach_unused_buf(vq))) | |
1944 | free_buf(buf, true); | |
1945 | } | |
a0e2dbfc AS |
1946 | portdev->vdev->config->del_vqs(portdev->vdev); |
1947 | kfree(portdev->in_vqs); | |
1948 | kfree(portdev->out_vqs); | |
1949 | } | |
1950 | ||
aa44ec86 MT |
1951 | static void virtcons_remove(struct virtio_device *vdev) |
1952 | { | |
1953 | struct ports_device *portdev; | |
1954 | struct port *port, *port2; | |
1955 | ||
1956 | portdev = vdev->priv; | |
1957 | ||
1958 | spin_lock_irq(&pdrvdata_lock); | |
1959 | list_del(&portdev->list); | |
1960 | spin_unlock_irq(&pdrvdata_lock); | |
1961 | ||
1962 | /* Disable interrupts for vqs */ | |
1963 | vdev->config->reset(vdev); | |
1964 | /* Finish up work that's lined up */ | |
1965 | if (use_multiport(portdev)) | |
1966 | cancel_work_sync(&portdev->control_work); | |
1967 | else | |
1968 | cancel_work_sync(&portdev->config_work); | |
1969 | ||
1970 | list_for_each_entry_safe(port, port2, &portdev->ports, list) | |
1971 | unplug_port(port); | |
1972 | ||
1973 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
1974 | ||
1975 | /* | |
1976 | * When yanking out a device, we immediately lose the | |
1977 | * (device-side) queues. So there's no point in keeping the | |
1978 | * guest side around till we drop our final reference. This | |
1979 | * also means that any ports which are in an open state will | |
1980 | * have to just stop using the port, as the vqs are going | |
1981 | * away. | |
1982 | */ | |
1983 | remove_vqs(portdev); | |
1984 | kfree(portdev); | |
1985 | } | |
1986 | ||
1c85bf35 AS |
1987 | /* |
1988 | * Once we're further in boot, we get probed like any other virtio | |
1989 | * device. | |
17634ba2 AS |
1990 | * |
1991 | * If the host also supports multiple console ports, we check the | |
1992 | * config space to see how many ports the host has spawned. We | |
1993 | * initialize each port found. | |
1c85bf35 | 1994 | */ |
2223cbec | 1995 | static int virtcons_probe(struct virtio_device *vdev) |
1c85bf35 | 1996 | { |
1c85bf35 AS |
1997 | struct ports_device *portdev; |
1998 | int err; | |
17634ba2 | 1999 | bool multiport; |
5e38483b CB |
2000 | bool early = early_put_chars != NULL; |
2001 | ||
be8ff595 RR |
2002 | /* We only need a config space if features are offered */ |
2003 | if (!vdev->config->get && | |
2004 | (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE) | |
2005 | || virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT))) { | |
011f0e7a MT |
2006 | dev_err(&vdev->dev, "%s failure: config access disabled\n", |
2007 | __func__); | |
2008 | return -EINVAL; | |
2009 | } | |
2010 | ||
5e38483b CB |
2011 | /* Ensure to read early_put_chars now */ |
2012 | barrier(); | |
1c85bf35 AS |
2013 | |
2014 | portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); | |
2015 | if (!portdev) { | |
2016 | err = -ENOMEM; | |
2017 | goto fail; | |
2018 | } | |
2019 | ||
2020 | /* Attach this portdev to this virtio_device, and vice-versa. */ | |
2021 | portdev->vdev = vdev; | |
2022 | vdev->priv = portdev; | |
2023 | ||
fb08bd27 AS |
2024 | portdev->chr_major = register_chrdev(0, "virtio-portsdev", |
2025 | &portdev_fops); | |
2026 | if (portdev->chr_major < 0) { | |
2027 | dev_err(&vdev->dev, | |
2028 | "Error %d registering chrdev for device %u\n", | |
dc18f080 | 2029 | portdev->chr_major, vdev->index); |
fb08bd27 AS |
2030 | err = portdev->chr_major; |
2031 | goto free; | |
2032 | } | |
2033 | ||
17634ba2 | 2034 | multiport = false; |
7328fa64 | 2035 | portdev->max_nr_ports = 1; |
1b637046 SB |
2036 | |
2037 | /* Don't test MULTIPORT at all if we're rproc: not a valid feature! */ | |
2038 | if (!is_rproc_serial(vdev) && | |
855e0c52 RR |
2039 | virtio_cread_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT, |
2040 | struct virtio_console_config, max_nr_ports, | |
7328fa64 | 2041 | &portdev->max_nr_ports) == 0) { |
17634ba2 | 2042 | multiport = true; |
1b637046 | 2043 | } |
17634ba2 | 2044 | |
2658a79a AS |
2045 | err = init_vqs(portdev); |
2046 | if (err < 0) { | |
2047 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); | |
fb08bd27 | 2048 | goto free_chrdev; |
2658a79a | 2049 | } |
1c85bf35 | 2050 | |
17634ba2 AS |
2051 | spin_lock_init(&portdev->ports_lock); |
2052 | INIT_LIST_HEAD(&portdev->ports); | |
5c60300d | 2053 | INIT_LIST_HEAD(&portdev->list); |
17634ba2 | 2054 | |
65eca3a2 CH |
2055 | virtio_device_ready(portdev->vdev); |
2056 | ||
eeb8a7e8 | 2057 | INIT_WORK(&portdev->config_work, &config_work_handler); |
4f6e24ed MT |
2058 | INIT_WORK(&portdev->control_work, &control_work_handler); |
2059 | ||
17634ba2 | 2060 | if (multiport) { |
165b1b8b | 2061 | spin_lock_init(&portdev->c_ivq_lock); |
9ba5c80b | 2062 | spin_lock_init(&portdev->c_ovq_lock); |
17634ba2 | 2063 | |
d791cfcb LV |
2064 | err = fill_queue(portdev->c_ivq, &portdev->c_ivq_lock); |
2065 | if (err < 0) { | |
22a29eac AS |
2066 | dev_err(&vdev->dev, |
2067 | "Error allocating buffers for control queue\n"); | |
5c60300d MT |
2068 | /* |
2069 | * The host might want to notify mgmt sw about device | |
2070 | * add failure. | |
2071 | */ | |
2072 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, | |
2073 | VIRTIO_CONSOLE_DEVICE_READY, 0); | |
2074 | /* Device was functional: we need full cleanup. */ | |
2075 | virtcons_remove(vdev); | |
d791cfcb | 2076 | return err; |
22a29eac | 2077 | } |
1d05160b AS |
2078 | } else { |
2079 | /* | |
2080 | * For backward compatibility: Create a console port | |
2081 | * if we're running on older host. | |
2082 | */ | |
2083 | add_port(portdev, 0); | |
17634ba2 AS |
2084 | } |
2085 | ||
6bdf2afd AS |
2086 | spin_lock_irq(&pdrvdata_lock); |
2087 | list_add_tail(&portdev->list, &pdrvdata.portdevs); | |
2088 | spin_unlock_irq(&pdrvdata_lock); | |
2089 | ||
f909f850 AS |
2090 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
2091 | VIRTIO_CONSOLE_DEVICE_READY, 1); | |
5e38483b CB |
2092 | |
2093 | /* | |
2094 | * If there was an early virtio console, assume that there are no | |
2095 | * other consoles. We need to wait until the hvc_alloc matches the | |
2096 | * hvc_instantiate, otherwise tty_open will complain, resulting in | |
2097 | * a "Warning: unable to open an initial console" boot failure. | |
2098 | * Without multiport this is done in add_port above. With multiport | |
2099 | * this might take some host<->guest communication - thus we have to | |
2100 | * wait. | |
2101 | */ | |
2102 | if (multiport && early) | |
2103 | wait_for_completion(&early_console_added); | |
2104 | ||
31610434 RR |
2105 | return 0; |
2106 | ||
fb08bd27 AS |
2107 | free_chrdev: |
2108 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); | |
31610434 | 2109 | free: |
1c85bf35 | 2110 | kfree(portdev); |
31610434 RR |
2111 | fail: |
2112 | return err; | |
2113 | } | |
2114 | ||
2115 | static struct virtio_device_id id_table[] = { | |
2116 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, | |
2117 | { 0 }, | |
2118 | }; | |
2119 | ||
c2983458 CB |
2120 | static unsigned int features[] = { |
2121 | VIRTIO_CONSOLE_F_SIZE, | |
b99fa815 | 2122 | VIRTIO_CONSOLE_F_MULTIPORT, |
c2983458 CB |
2123 | }; |
2124 | ||
1b637046 SB |
2125 | static struct virtio_device_id rproc_serial_id_table[] = { |
2126 | #if IS_ENABLED(CONFIG_REMOTEPROC) | |
2127 | { VIRTIO_ID_RPROC_SERIAL, VIRTIO_DEV_ANY_ID }, | |
2128 | #endif | |
2129 | { 0 }, | |
2130 | }; | |
2131 | ||
2132 | static unsigned int rproc_serial_features[] = { | |
2133 | }; | |
2134 | ||
89107000 | 2135 | #ifdef CONFIG_PM_SLEEP |
2b8f41d8 AS |
2136 | static int virtcons_freeze(struct virtio_device *vdev) |
2137 | { | |
2138 | struct ports_device *portdev; | |
2139 | struct port *port; | |
2140 | ||
2141 | portdev = vdev->priv; | |
2142 | ||
2143 | vdev->config->reset(vdev); | |
2144 | ||
2055997f MT |
2145 | if (use_multiport(portdev)) |
2146 | virtqueue_disable_cb(portdev->c_ivq); | |
2b8f41d8 | 2147 | cancel_work_sync(&portdev->control_work); |
eeb8a7e8 | 2148 | cancel_work_sync(&portdev->config_work); |
c743d09d AS |
2149 | /* |
2150 | * Once more: if control_work_handler() was running, it would | |
2151 | * enable the cb as the last step. | |
2152 | */ | |
2055997f MT |
2153 | if (use_multiport(portdev)) |
2154 | virtqueue_disable_cb(portdev->c_ivq); | |
2b8f41d8 AS |
2155 | |
2156 | list_for_each_entry(port, &portdev->ports, list) { | |
c743d09d AS |
2157 | virtqueue_disable_cb(port->in_vq); |
2158 | virtqueue_disable_cb(port->out_vq); | |
2b8f41d8 AS |
2159 | /* |
2160 | * We'll ask the host later if the new invocation has | |
2161 | * the port opened or closed. | |
2162 | */ | |
2163 | port->host_connected = false; | |
2164 | remove_port_data(port); | |
2165 | } | |
2166 | remove_vqs(portdev); | |
2167 | ||
2168 | return 0; | |
2169 | } | |
2170 | ||
2171 | static int virtcons_restore(struct virtio_device *vdev) | |
2172 | { | |
2173 | struct ports_device *portdev; | |
2174 | struct port *port; | |
2175 | int ret; | |
2176 | ||
2177 | portdev = vdev->priv; | |
2178 | ||
2179 | ret = init_vqs(portdev); | |
2180 | if (ret) | |
2181 | return ret; | |
2182 | ||
401bbdc9 MT |
2183 | virtio_device_ready(portdev->vdev); |
2184 | ||
2b8f41d8 | 2185 | if (use_multiport(portdev)) |
165b1b8b | 2186 | fill_queue(portdev->c_ivq, &portdev->c_ivq_lock); |
2b8f41d8 AS |
2187 | |
2188 | list_for_each_entry(port, &portdev->ports, list) { | |
2189 | port->in_vq = portdev->in_vqs[port->id]; | |
2190 | port->out_vq = portdev->out_vqs[port->id]; | |
2191 | ||
2192 | fill_queue(port->in_vq, &port->inbuf_lock); | |
2193 | ||
2194 | /* Get port open/close status on the host */ | |
2195 | send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); | |
fa8b66cc AS |
2196 | |
2197 | /* | |
2198 | * If a port was open at the time of suspending, we | |
2199 | * have to let the host know that it's still open. | |
2200 | */ | |
2201 | if (port->guest_connected) | |
2202 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); | |
2b8f41d8 AS |
2203 | } |
2204 | return 0; | |
2205 | } | |
2206 | #endif | |
2207 | ||
31610434 | 2208 | static struct virtio_driver virtio_console = { |
c2983458 CB |
2209 | .feature_table = features, |
2210 | .feature_table_size = ARRAY_SIZE(features), | |
31610434 RR |
2211 | .driver.name = KBUILD_MODNAME, |
2212 | .driver.owner = THIS_MODULE, | |
2213 | .id_table = id_table, | |
2214 | .probe = virtcons_probe, | |
7177876f | 2215 | .remove = virtcons_remove, |
7f5d810d | 2216 | .config_changed = config_intr, |
89107000 | 2217 | #ifdef CONFIG_PM_SLEEP |
2b8f41d8 AS |
2218 | .freeze = virtcons_freeze, |
2219 | .restore = virtcons_restore, | |
2220 | #endif | |
31610434 RR |
2221 | }; |
2222 | ||
bcd2982a | 2223 | static struct virtio_driver virtio_rproc_serial = { |
1b637046 SB |
2224 | .feature_table = rproc_serial_features, |
2225 | .feature_table_size = ARRAY_SIZE(rproc_serial_features), | |
2226 | .driver.name = "virtio_rproc_serial", | |
2227 | .driver.owner = THIS_MODULE, | |
2228 | .id_table = rproc_serial_id_table, | |
2229 | .probe = virtcons_probe, | |
2230 | .remove = virtcons_remove, | |
2231 | }; | |
2232 | ||
31610434 RR |
2233 | static int __init init(void) |
2234 | { | |
fb08bd27 AS |
2235 | int err; |
2236 | ||
2237 | pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); | |
2238 | if (IS_ERR(pdrvdata.class)) { | |
2239 | err = PTR_ERR(pdrvdata.class); | |
2240 | pr_err("Error %d creating virtio-ports class\n", err); | |
2241 | return err; | |
2242 | } | |
d99393ef AS |
2243 | |
2244 | pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); | |
3f0d0c9b | 2245 | if (!pdrvdata.debugfs_dir) |
2eec1080 | 2246 | pr_warn("Error creating debugfs dir for virtio-ports\n"); |
38edf58d | 2247 | INIT_LIST_HEAD(&pdrvdata.consoles); |
6bdf2afd | 2248 | INIT_LIST_HEAD(&pdrvdata.portdevs); |
38edf58d | 2249 | |
33e1afc3 AK |
2250 | err = register_virtio_driver(&virtio_console); |
2251 | if (err < 0) { | |
2252 | pr_err("Error %d registering virtio driver\n", err); | |
2253 | goto free; | |
2254 | } | |
1b637046 SB |
2255 | err = register_virtio_driver(&virtio_rproc_serial); |
2256 | if (err < 0) { | |
2257 | pr_err("Error %d registering virtio rproc serial driver\n", | |
2258 | err); | |
2259 | goto unregister; | |
2260 | } | |
33e1afc3 | 2261 | return 0; |
1b637046 SB |
2262 | unregister: |
2263 | unregister_virtio_driver(&virtio_console); | |
33e1afc3 | 2264 | free: |
5885e48e | 2265 | debugfs_remove_recursive(pdrvdata.debugfs_dir); |
33e1afc3 AK |
2266 | class_destroy(pdrvdata.class); |
2267 | return err; | |
31610434 | 2268 | } |
7177876f AS |
2269 | |
2270 | static void __exit fini(void) | |
2271 | { | |
1b637046 SB |
2272 | reclaim_dma_bufs(); |
2273 | ||
7177876f | 2274 | unregister_virtio_driver(&virtio_console); |
1b637046 | 2275 | unregister_virtio_driver(&virtio_rproc_serial); |
7177876f AS |
2276 | |
2277 | class_destroy(pdrvdata.class); | |
5885e48e | 2278 | debugfs_remove_recursive(pdrvdata.debugfs_dir); |
7177876f | 2279 | } |
31610434 | 2280 | module_init(init); |
7177876f | 2281 | module_exit(fini); |
31610434 RR |
2282 | |
2283 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2284 | MODULE_DESCRIPTION("Virtio console driver"); | |
2285 | MODULE_LICENSE("GPL"); |