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71bad7f0 | 1 | /** |
2 | * Copyright (c) 2014 Raspberry Pi (Trading) Ltd. All rights reserved. | |
3 | * Copyright (c) 2010-2012 Broadcom. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions, and the following disclaimer, | |
10 | * without modification. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * 3. The names of the above-listed copyright holders may not be used | |
15 | * to endorse or promote products derived from this software without | |
16 | * specific prior written permission. | |
17 | * | |
18 | * ALTERNATIVELY, this software may be distributed under the terms of the | |
19 | * GNU General Public License ("GPL") version 2, as published by the Free | |
20 | * Software Foundation. | |
21 | * | |
22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
23 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
24 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
25 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
26 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
27 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
28 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
29 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
30 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
31 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
32 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
33 | */ | |
34 | ||
35 | #include <linux/kernel.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/types.h> | |
38 | #include <linux/errno.h> | |
39 | #include <linux/cdev.h> | |
40 | #include <linux/fs.h> | |
41 | #include <linux/device.h> | |
42 | #include <linux/mm.h> | |
43 | #include <linux/highmem.h> | |
44 | #include <linux/pagemap.h> | |
45 | #include <linux/bug.h> | |
46 | #include <linux/semaphore.h> | |
47 | #include <linux/list.h> | |
48 | #include <linux/of.h> | |
49 | #include <linux/platform_device.h> | |
50 | #include <soc/bcm2835/raspberrypi-firmware.h> | |
51 | ||
52 | #include "vchiq_core.h" | |
53 | #include "vchiq_ioctl.h" | |
54 | #include "vchiq_arm.h" | |
55 | #include "vchiq_debugfs.h" | |
56 | #include "vchiq_killable.h" | |
57 | ||
58 | #define DEVICE_NAME "vchiq" | |
59 | ||
60 | /* Override the default prefix, which would be vchiq_arm (from the filename) */ | |
61 | #undef MODULE_PARAM_PREFIX | |
62 | #define MODULE_PARAM_PREFIX DEVICE_NAME "." | |
63 | ||
64 | #define VCHIQ_MINOR 0 | |
65 | ||
66 | /* Some per-instance constants */ | |
67 | #define MAX_COMPLETIONS 16 | |
68 | #define MAX_SERVICES 64 | |
69 | #define MAX_ELEMENTS 8 | |
70 | #define MSG_QUEUE_SIZE 64 | |
71 | ||
72 | #define KEEPALIVE_VER 1 | |
73 | #define KEEPALIVE_VER_MIN KEEPALIVE_VER | |
74 | ||
75 | /* Run time control of log level, based on KERN_XXX level. */ | |
76 | int vchiq_arm_log_level = VCHIQ_LOG_DEFAULT; | |
77 | int vchiq_susp_log_level = VCHIQ_LOG_ERROR; | |
78 | ||
79 | #define SUSPEND_TIMER_TIMEOUT_MS 100 | |
80 | #define SUSPEND_RETRY_TIMER_TIMEOUT_MS 1000 | |
81 | ||
82 | #define VC_SUSPEND_NUM_OFFSET 3 /* number of values before idle which are -ve */ | |
83 | static const char *const suspend_state_names[] = { | |
84 | "VC_SUSPEND_FORCE_CANCELED", | |
85 | "VC_SUSPEND_REJECTED", | |
86 | "VC_SUSPEND_FAILED", | |
87 | "VC_SUSPEND_IDLE", | |
88 | "VC_SUSPEND_REQUESTED", | |
89 | "VC_SUSPEND_IN_PROGRESS", | |
90 | "VC_SUSPEND_SUSPENDED" | |
91 | }; | |
92 | #define VC_RESUME_NUM_OFFSET 1 /* number of values before idle which are -ve */ | |
93 | static const char *const resume_state_names[] = { | |
94 | "VC_RESUME_FAILED", | |
95 | "VC_RESUME_IDLE", | |
96 | "VC_RESUME_REQUESTED", | |
97 | "VC_RESUME_IN_PROGRESS", | |
98 | "VC_RESUME_RESUMED" | |
99 | }; | |
100 | /* The number of times we allow force suspend to timeout before actually | |
101 | ** _forcing_ suspend. This is to cater for SW which fails to release vchiq | |
102 | ** correctly - we don't want to prevent ARM suspend indefinitely in this case. | |
103 | */ | |
104 | #define FORCE_SUSPEND_FAIL_MAX 8 | |
105 | ||
106 | /* The time in ms allowed for videocore to go idle when force suspend has been | |
107 | * requested */ | |
108 | #define FORCE_SUSPEND_TIMEOUT_MS 200 | |
109 | ||
110 | ||
111 | static void suspend_timer_callback(unsigned long context); | |
112 | ||
113 | ||
114 | typedef struct user_service_struct { | |
115 | VCHIQ_SERVICE_T *service; | |
116 | void *userdata; | |
117 | VCHIQ_INSTANCE_T instance; | |
118 | char is_vchi; | |
119 | char dequeue_pending; | |
120 | char close_pending; | |
121 | int message_available_pos; | |
122 | int msg_insert; | |
123 | int msg_remove; | |
124 | struct semaphore insert_event; | |
125 | struct semaphore remove_event; | |
126 | struct semaphore close_event; | |
127 | VCHIQ_HEADER_T * msg_queue[MSG_QUEUE_SIZE]; | |
128 | } USER_SERVICE_T; | |
129 | ||
130 | struct bulk_waiter_node { | |
131 | struct bulk_waiter bulk_waiter; | |
132 | int pid; | |
133 | struct list_head list; | |
134 | }; | |
135 | ||
136 | struct vchiq_instance_struct { | |
137 | VCHIQ_STATE_T *state; | |
138 | VCHIQ_COMPLETION_DATA_T completions[MAX_COMPLETIONS]; | |
139 | int completion_insert; | |
140 | int completion_remove; | |
141 | struct semaphore insert_event; | |
142 | struct semaphore remove_event; | |
143 | struct mutex completion_mutex; | |
144 | ||
145 | int connected; | |
146 | int closing; | |
147 | int pid; | |
148 | int mark; | |
149 | int use_close_delivered; | |
150 | int trace; | |
151 | ||
152 | struct list_head bulk_waiter_list; | |
153 | struct mutex bulk_waiter_list_mutex; | |
154 | ||
155 | VCHIQ_DEBUGFS_NODE_T debugfs_node; | |
156 | }; | |
157 | ||
158 | typedef struct dump_context_struct { | |
159 | char __user *buf; | |
160 | size_t actual; | |
161 | size_t space; | |
162 | loff_t offset; | |
163 | } DUMP_CONTEXT_T; | |
164 | ||
165 | static struct cdev vchiq_cdev; | |
166 | static dev_t vchiq_devid; | |
167 | static VCHIQ_STATE_T g_state; | |
168 | static struct class *vchiq_class; | |
169 | static struct device *vchiq_dev; | |
170 | static DEFINE_SPINLOCK(msg_queue_spinlock); | |
171 | ||
172 | static const char *const ioctl_names[] = { | |
173 | "CONNECT", | |
174 | "SHUTDOWN", | |
175 | "CREATE_SERVICE", | |
176 | "REMOVE_SERVICE", | |
177 | "QUEUE_MESSAGE", | |
178 | "QUEUE_BULK_TRANSMIT", | |
179 | "QUEUE_BULK_RECEIVE", | |
180 | "AWAIT_COMPLETION", | |
181 | "DEQUEUE_MESSAGE", | |
182 | "GET_CLIENT_ID", | |
183 | "GET_CONFIG", | |
184 | "CLOSE_SERVICE", | |
185 | "USE_SERVICE", | |
186 | "RELEASE_SERVICE", | |
187 | "SET_SERVICE_OPTION", | |
188 | "DUMP_PHYS_MEM", | |
189 | "LIB_VERSION", | |
190 | "CLOSE_DELIVERED" | |
191 | }; | |
192 | ||
193 | vchiq_static_assert((sizeof(ioctl_names)/sizeof(ioctl_names[0])) == | |
194 | (VCHIQ_IOC_MAX + 1)); | |
195 | ||
196 | static void | |
197 | dump_phys_mem(void *virt_addr, uint32_t num_bytes); | |
198 | ||
199 | /**************************************************************************** | |
200 | * | |
201 | * add_completion | |
202 | * | |
203 | ***************************************************************************/ | |
204 | ||
205 | static VCHIQ_STATUS_T | |
206 | add_completion(VCHIQ_INSTANCE_T instance, VCHIQ_REASON_T reason, | |
207 | VCHIQ_HEADER_T *header, USER_SERVICE_T *user_service, | |
208 | void *bulk_userdata) | |
209 | { | |
210 | VCHIQ_COMPLETION_DATA_T *completion; | |
211 | DEBUG_INITIALISE(g_state.local) | |
212 | ||
213 | while (instance->completion_insert == | |
214 | (instance->completion_remove + MAX_COMPLETIONS)) { | |
215 | /* Out of space - wait for the client */ | |
216 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
217 | vchiq_log_trace(vchiq_arm_log_level, | |
218 | "add_completion - completion queue full"); | |
219 | DEBUG_COUNT(COMPLETION_QUEUE_FULL_COUNT); | |
220 | if (down_interruptible(&instance->remove_event) != 0) { | |
221 | vchiq_log_info(vchiq_arm_log_level, | |
222 | "service_callback interrupted"); | |
223 | return VCHIQ_RETRY; | |
224 | } else if (instance->closing) { | |
225 | vchiq_log_info(vchiq_arm_log_level, | |
226 | "service_callback closing"); | |
227 | return VCHIQ_ERROR; | |
228 | } | |
229 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
230 | } | |
231 | ||
232 | completion = | |
233 | &instance->completions[instance->completion_insert & | |
234 | (MAX_COMPLETIONS - 1)]; | |
235 | ||
236 | completion->header = header; | |
237 | completion->reason = reason; | |
238 | /* N.B. service_userdata is updated while processing AWAIT_COMPLETION */ | |
239 | completion->service_userdata = user_service->service; | |
240 | completion->bulk_userdata = bulk_userdata; | |
241 | ||
242 | if (reason == VCHIQ_SERVICE_CLOSED) { | |
243 | /* Take an extra reference, to be held until | |
244 | this CLOSED notification is delivered. */ | |
245 | lock_service(user_service->service); | |
246 | if (instance->use_close_delivered) | |
247 | user_service->close_pending = 1; | |
248 | } | |
249 | ||
250 | /* A write barrier is needed here to ensure that the entire completion | |
251 | record is written out before the insert point. */ | |
252 | wmb(); | |
253 | ||
254 | if (reason == VCHIQ_MESSAGE_AVAILABLE) | |
255 | user_service->message_available_pos = | |
256 | instance->completion_insert; | |
257 | instance->completion_insert++; | |
258 | ||
259 | up(&instance->insert_event); | |
260 | ||
261 | return VCHIQ_SUCCESS; | |
262 | } | |
263 | ||
264 | /**************************************************************************** | |
265 | * | |
266 | * service_callback | |
267 | * | |
268 | ***************************************************************************/ | |
269 | ||
270 | static VCHIQ_STATUS_T | |
271 | service_callback(VCHIQ_REASON_T reason, VCHIQ_HEADER_T *header, | |
272 | VCHIQ_SERVICE_HANDLE_T handle, void *bulk_userdata) | |
273 | { | |
274 | /* How do we ensure the callback goes to the right client? | |
275 | ** The service_user data points to a USER_SERVICE_T record containing | |
276 | ** the original callback and the user state structure, which contains a | |
277 | ** circular buffer for completion records. | |
278 | */ | |
279 | USER_SERVICE_T *user_service; | |
280 | VCHIQ_SERVICE_T *service; | |
281 | VCHIQ_INSTANCE_T instance; | |
282 | DEBUG_INITIALISE(g_state.local) | |
283 | ||
284 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
285 | ||
286 | service = handle_to_service(handle); | |
287 | BUG_ON(!service); | |
288 | user_service = (USER_SERVICE_T *)service->base.userdata; | |
289 | instance = user_service->instance; | |
290 | ||
291 | if (!instance || instance->closing) | |
292 | return VCHIQ_SUCCESS; | |
293 | ||
294 | vchiq_log_trace(vchiq_arm_log_level, | |
295 | "service_callback - service %lx(%d,%p), reason %d, header %lx, " | |
296 | "instance %lx, bulk_userdata %lx", | |
297 | (unsigned long)user_service, | |
298 | service->localport, user_service->userdata, | |
299 | reason, (unsigned long)header, | |
300 | (unsigned long)instance, (unsigned long)bulk_userdata); | |
301 | ||
302 | if (header && user_service->is_vchi) { | |
303 | spin_lock(&msg_queue_spinlock); | |
304 | while (user_service->msg_insert == | |
305 | (user_service->msg_remove + MSG_QUEUE_SIZE)) { | |
306 | spin_unlock(&msg_queue_spinlock); | |
307 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
308 | DEBUG_COUNT(MSG_QUEUE_FULL_COUNT); | |
309 | vchiq_log_trace(vchiq_arm_log_level, | |
310 | "service_callback - msg queue full"); | |
311 | /* If there is no MESSAGE_AVAILABLE in the completion | |
312 | ** queue, add one | |
313 | */ | |
314 | if ((user_service->message_available_pos - | |
315 | instance->completion_remove) < 0) { | |
316 | VCHIQ_STATUS_T status; | |
317 | vchiq_log_info(vchiq_arm_log_level, | |
318 | "Inserting extra MESSAGE_AVAILABLE"); | |
319 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
320 | status = add_completion(instance, reason, | |
321 | NULL, user_service, bulk_userdata); | |
322 | if (status != VCHIQ_SUCCESS) { | |
323 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
324 | return status; | |
325 | } | |
326 | } | |
327 | ||
328 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
329 | if (down_interruptible(&user_service->remove_event) | |
330 | != 0) { | |
331 | vchiq_log_info(vchiq_arm_log_level, | |
332 | "service_callback interrupted"); | |
333 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
334 | return VCHIQ_RETRY; | |
335 | } else if (instance->closing) { | |
336 | vchiq_log_info(vchiq_arm_log_level, | |
337 | "service_callback closing"); | |
338 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
339 | return VCHIQ_ERROR; | |
340 | } | |
341 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
342 | spin_lock(&msg_queue_spinlock); | |
343 | } | |
344 | ||
345 | user_service->msg_queue[user_service->msg_insert & | |
346 | (MSG_QUEUE_SIZE - 1)] = header; | |
347 | user_service->msg_insert++; | |
348 | spin_unlock(&msg_queue_spinlock); | |
349 | ||
350 | up(&user_service->insert_event); | |
351 | ||
352 | /* If there is a thread waiting in DEQUEUE_MESSAGE, or if | |
353 | ** there is a MESSAGE_AVAILABLE in the completion queue then | |
354 | ** bypass the completion queue. | |
355 | */ | |
356 | if (((user_service->message_available_pos - | |
357 | instance->completion_remove) >= 0) || | |
358 | user_service->dequeue_pending) { | |
359 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
360 | user_service->dequeue_pending = 0; | |
361 | return VCHIQ_SUCCESS; | |
362 | } | |
363 | ||
364 | header = NULL; | |
365 | } | |
366 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
367 | ||
368 | return add_completion(instance, reason, header, user_service, | |
369 | bulk_userdata); | |
370 | } | |
371 | ||
372 | /**************************************************************************** | |
373 | * | |
374 | * user_service_free | |
375 | * | |
376 | ***************************************************************************/ | |
377 | static void | |
378 | user_service_free(void *userdata) | |
379 | { | |
380 | kfree(userdata); | |
381 | } | |
382 | ||
383 | /**************************************************************************** | |
384 | * | |
385 | * close_delivered | |
386 | * | |
387 | ***************************************************************************/ | |
388 | static void close_delivered(USER_SERVICE_T *user_service) | |
389 | { | |
390 | vchiq_log_info(vchiq_arm_log_level, | |
391 | "close_delivered(handle=%x)", | |
392 | user_service->service->handle); | |
393 | ||
394 | if (user_service->close_pending) { | |
395 | /* Allow the underlying service to be culled */ | |
396 | unlock_service(user_service->service); | |
397 | ||
398 | /* Wake the user-thread blocked in close_ or remove_service */ | |
399 | up(&user_service->close_event); | |
400 | ||
401 | user_service->close_pending = 0; | |
402 | } | |
403 | } | |
404 | ||
49bec49f MZ |
405 | struct vchiq_io_copy_callback_context { |
406 | VCHIQ_ELEMENT_T *current_element; | |
407 | size_t current_element_offset; | |
408 | unsigned long elements_to_go; | |
409 | size_t current_offset; | |
410 | }; | |
411 | ||
412 | static ssize_t | |
413 | vchiq_ioc_copy_element_data( | |
414 | void *context, | |
415 | void *dest, | |
416 | size_t offset, | |
417 | size_t maxsize) | |
418 | { | |
419 | long res; | |
420 | size_t bytes_this_round; | |
421 | struct vchiq_io_copy_callback_context *copy_context = | |
422 | (struct vchiq_io_copy_callback_context *)context; | |
423 | ||
424 | if (offset != copy_context->current_offset) | |
425 | return 0; | |
426 | ||
427 | if (!copy_context->elements_to_go) | |
428 | return 0; | |
429 | ||
430 | /* | |
431 | * Complex logic here to handle the case of 0 size elements | |
432 | * in the middle of the array of elements. | |
433 | * | |
434 | * Need to skip over these 0 size elements. | |
435 | */ | |
436 | while (1) { | |
437 | bytes_this_round = min(copy_context->current_element->size - | |
438 | copy_context->current_element_offset, | |
439 | maxsize); | |
440 | ||
441 | if (bytes_this_round) | |
442 | break; | |
443 | ||
444 | copy_context->elements_to_go--; | |
445 | copy_context->current_element++; | |
446 | copy_context->current_element_offset = 0; | |
447 | ||
448 | if (!copy_context->elements_to_go) | |
449 | return 0; | |
450 | } | |
451 | ||
452 | res = copy_from_user(dest, | |
453 | copy_context->current_element->data + | |
454 | copy_context->current_element_offset, | |
455 | bytes_this_round); | |
456 | ||
457 | if (res != 0) | |
458 | return -EFAULT; | |
459 | ||
460 | copy_context->current_element_offset += bytes_this_round; | |
461 | copy_context->current_offset += bytes_this_round; | |
462 | ||
463 | /* | |
464 | * Check if done with current element, and if so advance to the next. | |
465 | */ | |
466 | if (copy_context->current_element_offset == | |
467 | copy_context->current_element->size) { | |
468 | copy_context->elements_to_go--; | |
469 | copy_context->current_element++; | |
470 | copy_context->current_element_offset = 0; | |
471 | } | |
472 | ||
473 | return bytes_this_round; | |
474 | } | |
475 | ||
476 | /************************************************************************** | |
477 | * | |
478 | * vchiq_ioc_queue_message | |
479 | * | |
480 | **************************************************************************/ | |
481 | static VCHIQ_STATUS_T | |
482 | vchiq_ioc_queue_message(VCHIQ_SERVICE_HANDLE_T handle, | |
483 | VCHIQ_ELEMENT_T *elements, | |
484 | unsigned long count) | |
485 | { | |
486 | struct vchiq_io_copy_callback_context context; | |
487 | unsigned long i; | |
488 | size_t total_size = 0; | |
489 | ||
490 | context.current_element = elements; | |
491 | context.current_element_offset = 0; | |
492 | context.elements_to_go = count; | |
493 | context.current_offset = 0; | |
494 | ||
495 | for (i = 0; i < count; i++) { | |
496 | if (!elements[i].data && elements[i].size != 0) | |
497 | return -EFAULT; | |
498 | ||
499 | total_size += elements[i].size; | |
500 | } | |
501 | ||
502 | return vchiq_queue_message(handle, vchiq_ioc_copy_element_data, | |
503 | &context, total_size); | |
504 | } | |
505 | ||
71bad7f0 | 506 | /**************************************************************************** |
507 | * | |
508 | * vchiq_ioctl | |
509 | * | |
510 | ***************************************************************************/ | |
511 | static long | |
512 | vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
513 | { | |
514 | VCHIQ_INSTANCE_T instance = file->private_data; | |
515 | VCHIQ_STATUS_T status = VCHIQ_SUCCESS; | |
516 | VCHIQ_SERVICE_T *service = NULL; | |
517 | long ret = 0; | |
518 | int i, rc; | |
519 | DEBUG_INITIALISE(g_state.local) | |
520 | ||
521 | vchiq_log_trace(vchiq_arm_log_level, | |
df044ebf GKH |
522 | "vchiq_ioctl - instance %pK, cmd %s, arg %lx", |
523 | instance, | |
71bad7f0 | 524 | ((_IOC_TYPE(cmd) == VCHIQ_IOC_MAGIC) && |
525 | (_IOC_NR(cmd) <= VCHIQ_IOC_MAX)) ? | |
526 | ioctl_names[_IOC_NR(cmd)] : "<invalid>", arg); | |
527 | ||
528 | switch (cmd) { | |
529 | case VCHIQ_IOC_SHUTDOWN: | |
530 | if (!instance->connected) | |
531 | break; | |
532 | ||
533 | /* Remove all services */ | |
534 | i = 0; | |
535 | while ((service = next_service_by_instance(instance->state, | |
536 | instance, &i)) != NULL) { | |
537 | status = vchiq_remove_service(service->handle); | |
538 | unlock_service(service); | |
539 | if (status != VCHIQ_SUCCESS) | |
540 | break; | |
541 | } | |
542 | service = NULL; | |
543 | ||
544 | if (status == VCHIQ_SUCCESS) { | |
545 | /* Wake the completion thread and ask it to exit */ | |
546 | instance->closing = 1; | |
547 | up(&instance->insert_event); | |
548 | } | |
549 | ||
550 | break; | |
551 | ||
552 | case VCHIQ_IOC_CONNECT: | |
553 | if (instance->connected) { | |
554 | ret = -EINVAL; | |
555 | break; | |
556 | } | |
557 | rc = mutex_lock_interruptible(&instance->state->mutex); | |
558 | if (rc != 0) { | |
559 | vchiq_log_error(vchiq_arm_log_level, | |
560 | "vchiq: connect: could not lock mutex for " | |
561 | "state %d: %d", | |
562 | instance->state->id, rc); | |
563 | ret = -EINTR; | |
564 | break; | |
565 | } | |
566 | status = vchiq_connect_internal(instance->state, instance); | |
567 | mutex_unlock(&instance->state->mutex); | |
568 | ||
569 | if (status == VCHIQ_SUCCESS) | |
570 | instance->connected = 1; | |
571 | else | |
572 | vchiq_log_error(vchiq_arm_log_level, | |
573 | "vchiq: could not connect: %d", status); | |
574 | break; | |
575 | ||
576 | case VCHIQ_IOC_CREATE_SERVICE: { | |
577 | VCHIQ_CREATE_SERVICE_T args; | |
578 | USER_SERVICE_T *user_service = NULL; | |
579 | void *userdata; | |
580 | int srvstate; | |
581 | ||
582 | if (copy_from_user | |
583 | (&args, (const void __user *)arg, | |
584 | sizeof(args)) != 0) { | |
585 | ret = -EFAULT; | |
586 | break; | |
587 | } | |
588 | ||
589 | user_service = kmalloc(sizeof(USER_SERVICE_T), GFP_KERNEL); | |
590 | if (!user_service) { | |
591 | ret = -ENOMEM; | |
592 | break; | |
593 | } | |
594 | ||
595 | if (args.is_open) { | |
596 | if (!instance->connected) { | |
597 | ret = -ENOTCONN; | |
598 | kfree(user_service); | |
599 | break; | |
600 | } | |
601 | srvstate = VCHIQ_SRVSTATE_OPENING; | |
602 | } else { | |
603 | srvstate = | |
604 | instance->connected ? | |
605 | VCHIQ_SRVSTATE_LISTENING : | |
606 | VCHIQ_SRVSTATE_HIDDEN; | |
607 | } | |
608 | ||
609 | userdata = args.params.userdata; | |
610 | args.params.callback = service_callback; | |
611 | args.params.userdata = user_service; | |
612 | service = vchiq_add_service_internal( | |
613 | instance->state, | |
614 | &args.params, srvstate, | |
615 | instance, user_service_free); | |
616 | ||
617 | if (service != NULL) { | |
618 | user_service->service = service; | |
619 | user_service->userdata = userdata; | |
620 | user_service->instance = instance; | |
621 | user_service->is_vchi = (args.is_vchi != 0); | |
622 | user_service->dequeue_pending = 0; | |
623 | user_service->close_pending = 0; | |
624 | user_service->message_available_pos = | |
625 | instance->completion_remove - 1; | |
626 | user_service->msg_insert = 0; | |
627 | user_service->msg_remove = 0; | |
628 | sema_init(&user_service->insert_event, 0); | |
629 | sema_init(&user_service->remove_event, 0); | |
630 | sema_init(&user_service->close_event, 0); | |
631 | ||
632 | if (args.is_open) { | |
633 | status = vchiq_open_service_internal | |
634 | (service, instance->pid); | |
635 | if (status != VCHIQ_SUCCESS) { | |
636 | vchiq_remove_service(service->handle); | |
637 | service = NULL; | |
638 | ret = (status == VCHIQ_RETRY) ? | |
639 | -EINTR : -EIO; | |
640 | break; | |
641 | } | |
642 | } | |
643 | ||
644 | if (copy_to_user((void __user *) | |
645 | &(((VCHIQ_CREATE_SERVICE_T __user *) | |
646 | arg)->handle), | |
647 | (const void *)&service->handle, | |
648 | sizeof(service->handle)) != 0) { | |
649 | ret = -EFAULT; | |
650 | vchiq_remove_service(service->handle); | |
651 | } | |
652 | ||
653 | service = NULL; | |
654 | } else { | |
655 | ret = -EEXIST; | |
656 | kfree(user_service); | |
657 | } | |
658 | } break; | |
659 | ||
660 | case VCHIQ_IOC_CLOSE_SERVICE: { | |
661 | VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; | |
662 | ||
663 | service = find_service_for_instance(instance, handle); | |
664 | if (service != NULL) { | |
665 | USER_SERVICE_T *user_service = | |
666 | (USER_SERVICE_T *)service->base.userdata; | |
667 | /* close_pending is false on first entry, and when the | |
668 | wait in vchiq_close_service has been interrupted. */ | |
669 | if (!user_service->close_pending) { | |
670 | status = vchiq_close_service(service->handle); | |
671 | if (status != VCHIQ_SUCCESS) | |
672 | break; | |
673 | } | |
674 | ||
675 | /* close_pending is true once the underlying service | |
676 | has been closed until the client library calls the | |
677 | CLOSE_DELIVERED ioctl, signalling close_event. */ | |
678 | if (user_service->close_pending && | |
679 | down_interruptible(&user_service->close_event)) | |
680 | status = VCHIQ_RETRY; | |
681 | } | |
682 | else | |
683 | ret = -EINVAL; | |
684 | } break; | |
685 | ||
686 | case VCHIQ_IOC_REMOVE_SERVICE: { | |
687 | VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; | |
688 | ||
689 | service = find_service_for_instance(instance, handle); | |
690 | if (service != NULL) { | |
691 | USER_SERVICE_T *user_service = | |
692 | (USER_SERVICE_T *)service->base.userdata; | |
693 | /* close_pending is false on first entry, and when the | |
694 | wait in vchiq_close_service has been interrupted. */ | |
695 | if (!user_service->close_pending) { | |
696 | status = vchiq_remove_service(service->handle); | |
697 | if (status != VCHIQ_SUCCESS) | |
698 | break; | |
699 | } | |
700 | ||
701 | /* close_pending is true once the underlying service | |
702 | has been closed until the client library calls the | |
703 | CLOSE_DELIVERED ioctl, signalling close_event. */ | |
704 | if (user_service->close_pending && | |
705 | down_interruptible(&user_service->close_event)) | |
706 | status = VCHIQ_RETRY; | |
707 | } | |
708 | else | |
709 | ret = -EINVAL; | |
710 | } break; | |
711 | ||
712 | case VCHIQ_IOC_USE_SERVICE: | |
713 | case VCHIQ_IOC_RELEASE_SERVICE: { | |
714 | VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; | |
715 | ||
716 | service = find_service_for_instance(instance, handle); | |
717 | if (service != NULL) { | |
718 | status = (cmd == VCHIQ_IOC_USE_SERVICE) ? | |
719 | vchiq_use_service_internal(service) : | |
720 | vchiq_release_service_internal(service); | |
721 | if (status != VCHIQ_SUCCESS) { | |
722 | vchiq_log_error(vchiq_susp_log_level, | |
723 | "%s: cmd %s returned error %d for " | |
724 | "service %c%c%c%c:%03d", | |
725 | __func__, | |
726 | (cmd == VCHIQ_IOC_USE_SERVICE) ? | |
727 | "VCHIQ_IOC_USE_SERVICE" : | |
728 | "VCHIQ_IOC_RELEASE_SERVICE", | |
729 | status, | |
730 | VCHIQ_FOURCC_AS_4CHARS( | |
731 | service->base.fourcc), | |
732 | service->client_id); | |
733 | ret = -EINVAL; | |
734 | } | |
735 | } else | |
736 | ret = -EINVAL; | |
737 | } break; | |
738 | ||
739 | case VCHIQ_IOC_QUEUE_MESSAGE: { | |
740 | VCHIQ_QUEUE_MESSAGE_T args; | |
741 | if (copy_from_user | |
742 | (&args, (const void __user *)arg, | |
743 | sizeof(args)) != 0) { | |
744 | ret = -EFAULT; | |
745 | break; | |
746 | } | |
747 | ||
748 | service = find_service_for_instance(instance, args.handle); | |
749 | ||
750 | if ((service != NULL) && (args.count <= MAX_ELEMENTS)) { | |
751 | /* Copy elements into kernel space */ | |
752 | VCHIQ_ELEMENT_T elements[MAX_ELEMENTS]; | |
753 | if (copy_from_user(elements, args.elements, | |
754 | args.count * sizeof(VCHIQ_ELEMENT_T)) == 0) | |
49bec49f | 755 | status = vchiq_ioc_queue_message |
71bad7f0 | 756 | (args.handle, |
757 | elements, args.count); | |
758 | else | |
759 | ret = -EFAULT; | |
760 | } else { | |
761 | ret = -EINVAL; | |
762 | } | |
763 | } break; | |
764 | ||
765 | case VCHIQ_IOC_QUEUE_BULK_TRANSMIT: | |
766 | case VCHIQ_IOC_QUEUE_BULK_RECEIVE: { | |
767 | VCHIQ_QUEUE_BULK_TRANSFER_T args; | |
768 | struct bulk_waiter_node *waiter = NULL; | |
769 | VCHIQ_BULK_DIR_T dir = | |
770 | (cmd == VCHIQ_IOC_QUEUE_BULK_TRANSMIT) ? | |
771 | VCHIQ_BULK_TRANSMIT : VCHIQ_BULK_RECEIVE; | |
772 | ||
773 | if (copy_from_user | |
774 | (&args, (const void __user *)arg, | |
775 | sizeof(args)) != 0) { | |
776 | ret = -EFAULT; | |
777 | break; | |
778 | } | |
779 | ||
780 | service = find_service_for_instance(instance, args.handle); | |
781 | if (!service) { | |
782 | ret = -EINVAL; | |
783 | break; | |
784 | } | |
785 | ||
786 | if (args.mode == VCHIQ_BULK_MODE_BLOCKING) { | |
787 | waiter = kzalloc(sizeof(struct bulk_waiter_node), | |
788 | GFP_KERNEL); | |
789 | if (!waiter) { | |
790 | ret = -ENOMEM; | |
791 | break; | |
792 | } | |
793 | args.userdata = &waiter->bulk_waiter; | |
794 | } else if (args.mode == VCHIQ_BULK_MODE_WAITING) { | |
795 | struct list_head *pos; | |
796 | mutex_lock(&instance->bulk_waiter_list_mutex); | |
797 | list_for_each(pos, &instance->bulk_waiter_list) { | |
798 | if (list_entry(pos, struct bulk_waiter_node, | |
799 | list)->pid == current->pid) { | |
800 | waiter = list_entry(pos, | |
801 | struct bulk_waiter_node, | |
802 | list); | |
803 | list_del(pos); | |
804 | break; | |
805 | } | |
806 | ||
807 | } | |
808 | mutex_unlock(&instance->bulk_waiter_list_mutex); | |
809 | if (!waiter) { | |
810 | vchiq_log_error(vchiq_arm_log_level, | |
811 | "no bulk_waiter found for pid %d", | |
812 | current->pid); | |
813 | ret = -ESRCH; | |
814 | break; | |
815 | } | |
816 | vchiq_log_info(vchiq_arm_log_level, | |
df044ebf GKH |
817 | "found bulk_waiter %pK for pid %d", waiter, |
818 | current->pid); | |
71bad7f0 | 819 | args.userdata = &waiter->bulk_waiter; |
820 | } | |
821 | status = vchiq_bulk_transfer | |
822 | (args.handle, | |
823 | VCHI_MEM_HANDLE_INVALID, | |
824 | args.data, args.size, | |
825 | args.userdata, args.mode, | |
826 | dir); | |
827 | if (!waiter) | |
828 | break; | |
829 | if ((status != VCHIQ_RETRY) || fatal_signal_pending(current) || | |
830 | !waiter->bulk_waiter.bulk) { | |
831 | if (waiter->bulk_waiter.bulk) { | |
832 | /* Cancel the signal when the transfer | |
833 | ** completes. */ | |
834 | spin_lock(&bulk_waiter_spinlock); | |
835 | waiter->bulk_waiter.bulk->userdata = NULL; | |
836 | spin_unlock(&bulk_waiter_spinlock); | |
837 | } | |
838 | kfree(waiter); | |
839 | } else { | |
840 | const VCHIQ_BULK_MODE_T mode_waiting = | |
841 | VCHIQ_BULK_MODE_WAITING; | |
842 | waiter->pid = current->pid; | |
843 | mutex_lock(&instance->bulk_waiter_list_mutex); | |
844 | list_add(&waiter->list, &instance->bulk_waiter_list); | |
845 | mutex_unlock(&instance->bulk_waiter_list_mutex); | |
846 | vchiq_log_info(vchiq_arm_log_level, | |
df044ebf GKH |
847 | "saved bulk_waiter %pK for pid %d", |
848 | waiter, current->pid); | |
71bad7f0 | 849 | |
850 | if (copy_to_user((void __user *) | |
851 | &(((VCHIQ_QUEUE_BULK_TRANSFER_T __user *) | |
852 | arg)->mode), | |
853 | (const void *)&mode_waiting, | |
854 | sizeof(mode_waiting)) != 0) | |
855 | ret = -EFAULT; | |
856 | } | |
857 | } break; | |
858 | ||
859 | case VCHIQ_IOC_AWAIT_COMPLETION: { | |
860 | VCHIQ_AWAIT_COMPLETION_T args; | |
861 | ||
862 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); | |
863 | if (!instance->connected) { | |
864 | ret = -ENOTCONN; | |
865 | break; | |
866 | } | |
867 | ||
868 | if (copy_from_user(&args, (const void __user *)arg, | |
869 | sizeof(args)) != 0) { | |
870 | ret = -EFAULT; | |
871 | break; | |
872 | } | |
873 | ||
874 | mutex_lock(&instance->completion_mutex); | |
875 | ||
876 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); | |
877 | while ((instance->completion_remove == | |
878 | instance->completion_insert) | |
879 | && !instance->closing) { | |
880 | int rc; | |
881 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); | |
882 | mutex_unlock(&instance->completion_mutex); | |
883 | rc = down_interruptible(&instance->insert_event); | |
884 | mutex_lock(&instance->completion_mutex); | |
885 | if (rc != 0) { | |
886 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); | |
887 | vchiq_log_info(vchiq_arm_log_level, | |
888 | "AWAIT_COMPLETION interrupted"); | |
889 | ret = -EINTR; | |
890 | break; | |
891 | } | |
892 | } | |
893 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); | |
894 | ||
895 | /* A read memory barrier is needed to stop prefetch of a stale | |
896 | ** completion record | |
897 | */ | |
898 | rmb(); | |
899 | ||
900 | if (ret == 0) { | |
901 | int msgbufcount = args.msgbufcount; | |
902 | for (ret = 0; ret < args.count; ret++) { | |
903 | VCHIQ_COMPLETION_DATA_T *completion; | |
904 | VCHIQ_SERVICE_T *service; | |
905 | USER_SERVICE_T *user_service; | |
906 | VCHIQ_HEADER_T *header; | |
907 | if (instance->completion_remove == | |
908 | instance->completion_insert) | |
909 | break; | |
910 | completion = &instance->completions[ | |
911 | instance->completion_remove & | |
912 | (MAX_COMPLETIONS - 1)]; | |
913 | ||
914 | service = completion->service_userdata; | |
915 | user_service = service->base.userdata; | |
916 | completion->service_userdata = | |
917 | user_service->userdata; | |
918 | ||
919 | header = completion->header; | |
920 | if (header) { | |
921 | void __user *msgbuf; | |
922 | int msglen; | |
923 | ||
924 | msglen = header->size + | |
925 | sizeof(VCHIQ_HEADER_T); | |
926 | /* This must be a VCHIQ-style service */ | |
927 | if (args.msgbufsize < msglen) { | |
928 | vchiq_log_error( | |
929 | vchiq_arm_log_level, | |
df044ebf GKH |
930 | "header %pK: msgbufsize %x < msglen %x", |
931 | header, args.msgbufsize, | |
71bad7f0 | 932 | msglen); |
933 | WARN(1, "invalid message " | |
934 | "size\n"); | |
935 | if (ret == 0) | |
936 | ret = -EMSGSIZE; | |
937 | break; | |
938 | } | |
939 | if (msgbufcount <= 0) | |
940 | /* Stall here for lack of a | |
941 | ** buffer for the message. */ | |
942 | break; | |
943 | /* Get the pointer from user space */ | |
944 | msgbufcount--; | |
945 | if (copy_from_user(&msgbuf, | |
946 | (const void __user *) | |
947 | &args.msgbufs[msgbufcount], | |
948 | sizeof(msgbuf)) != 0) { | |
949 | if (ret == 0) | |
950 | ret = -EFAULT; | |
951 | break; | |
952 | } | |
953 | ||
954 | /* Copy the message to user space */ | |
955 | if (copy_to_user(msgbuf, header, | |
956 | msglen) != 0) { | |
957 | if (ret == 0) | |
958 | ret = -EFAULT; | |
959 | break; | |
960 | } | |
961 | ||
962 | /* Now it has been copied, the message | |
963 | ** can be released. */ | |
964 | vchiq_release_message(service->handle, | |
965 | header); | |
966 | ||
967 | /* The completion must point to the | |
968 | ** msgbuf. */ | |
969 | completion->header = msgbuf; | |
970 | } | |
971 | ||
972 | if ((completion->reason == | |
973 | VCHIQ_SERVICE_CLOSED) && | |
974 | !instance->use_close_delivered) | |
975 | unlock_service(service); | |
976 | ||
977 | if (copy_to_user((void __user *)( | |
978 | (size_t)args.buf + | |
979 | ret * sizeof(VCHIQ_COMPLETION_DATA_T)), | |
980 | completion, | |
981 | sizeof(VCHIQ_COMPLETION_DATA_T)) != 0) { | |
982 | if (ret == 0) | |
983 | ret = -EFAULT; | |
984 | break; | |
985 | } | |
986 | ||
987 | instance->completion_remove++; | |
988 | } | |
989 | ||
990 | if (msgbufcount != args.msgbufcount) { | |
991 | if (copy_to_user((void __user *) | |
992 | &((VCHIQ_AWAIT_COMPLETION_T *)arg)-> | |
993 | msgbufcount, | |
994 | &msgbufcount, | |
995 | sizeof(msgbufcount)) != 0) { | |
996 | ret = -EFAULT; | |
997 | } | |
998 | } | |
999 | } | |
1000 | ||
1001 | if (ret != 0) | |
1002 | up(&instance->remove_event); | |
1003 | mutex_unlock(&instance->completion_mutex); | |
1004 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); | |
1005 | } break; | |
1006 | ||
1007 | case VCHIQ_IOC_DEQUEUE_MESSAGE: { | |
1008 | VCHIQ_DEQUEUE_MESSAGE_T args; | |
1009 | USER_SERVICE_T *user_service; | |
1010 | VCHIQ_HEADER_T *header; | |
1011 | ||
1012 | DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); | |
1013 | if (copy_from_user | |
1014 | (&args, (const void __user *)arg, | |
1015 | sizeof(args)) != 0) { | |
1016 | ret = -EFAULT; | |
1017 | break; | |
1018 | } | |
1019 | service = find_service_for_instance(instance, args.handle); | |
1020 | if (!service) { | |
1021 | ret = -EINVAL; | |
1022 | break; | |
1023 | } | |
1024 | user_service = (USER_SERVICE_T *)service->base.userdata; | |
1025 | if (user_service->is_vchi == 0) { | |
1026 | ret = -EINVAL; | |
1027 | break; | |
1028 | } | |
1029 | ||
1030 | spin_lock(&msg_queue_spinlock); | |
1031 | if (user_service->msg_remove == user_service->msg_insert) { | |
1032 | if (!args.blocking) { | |
1033 | spin_unlock(&msg_queue_spinlock); | |
1034 | DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); | |
1035 | ret = -EWOULDBLOCK; | |
1036 | break; | |
1037 | } | |
1038 | user_service->dequeue_pending = 1; | |
1039 | do { | |
1040 | spin_unlock(&msg_queue_spinlock); | |
1041 | DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); | |
1042 | if (down_interruptible( | |
1043 | &user_service->insert_event) != 0) { | |
1044 | vchiq_log_info(vchiq_arm_log_level, | |
1045 | "DEQUEUE_MESSAGE interrupted"); | |
1046 | ret = -EINTR; | |
1047 | break; | |
1048 | } | |
1049 | spin_lock(&msg_queue_spinlock); | |
1050 | } while (user_service->msg_remove == | |
1051 | user_service->msg_insert); | |
1052 | ||
1053 | if (ret) | |
1054 | break; | |
1055 | } | |
1056 | ||
1057 | BUG_ON((int)(user_service->msg_insert - | |
1058 | user_service->msg_remove) < 0); | |
1059 | ||
1060 | header = user_service->msg_queue[user_service->msg_remove & | |
1061 | (MSG_QUEUE_SIZE - 1)]; | |
1062 | user_service->msg_remove++; | |
1063 | spin_unlock(&msg_queue_spinlock); | |
1064 | ||
1065 | up(&user_service->remove_event); | |
1066 | if (header == NULL) | |
1067 | ret = -ENOTCONN; | |
1068 | else if (header->size <= args.bufsize) { | |
1069 | /* Copy to user space if msgbuf is not NULL */ | |
1070 | if ((args.buf == NULL) || | |
1071 | (copy_to_user((void __user *)args.buf, | |
1072 | header->data, | |
1073 | header->size) == 0)) { | |
1074 | ret = header->size; | |
1075 | vchiq_release_message( | |
1076 | service->handle, | |
1077 | header); | |
1078 | } else | |
1079 | ret = -EFAULT; | |
1080 | } else { | |
1081 | vchiq_log_error(vchiq_arm_log_level, | |
df044ebf GKH |
1082 | "header %pK: bufsize %x < size %x", |
1083 | header, args.bufsize, header->size); | |
71bad7f0 | 1084 | WARN(1, "invalid size\n"); |
1085 | ret = -EMSGSIZE; | |
1086 | } | |
1087 | DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); | |
1088 | } break; | |
1089 | ||
1090 | case VCHIQ_IOC_GET_CLIENT_ID: { | |
1091 | VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; | |
1092 | ||
1093 | ret = vchiq_get_client_id(handle); | |
1094 | } break; | |
1095 | ||
1096 | case VCHIQ_IOC_GET_CONFIG: { | |
1097 | VCHIQ_GET_CONFIG_T args; | |
1098 | VCHIQ_CONFIG_T config; | |
1099 | ||
1100 | if (copy_from_user(&args, (const void __user *)arg, | |
1101 | sizeof(args)) != 0) { | |
1102 | ret = -EFAULT; | |
1103 | break; | |
1104 | } | |
1105 | if (args.config_size > sizeof(config)) { | |
1106 | ret = -EINVAL; | |
1107 | break; | |
1108 | } | |
1109 | status = vchiq_get_config(instance, args.config_size, &config); | |
1110 | if (status == VCHIQ_SUCCESS) { | |
1111 | if (copy_to_user((void __user *)args.pconfig, | |
1112 | &config, args.config_size) != 0) { | |
1113 | ret = -EFAULT; | |
1114 | break; | |
1115 | } | |
1116 | } | |
1117 | } break; | |
1118 | ||
1119 | case VCHIQ_IOC_SET_SERVICE_OPTION: { | |
1120 | VCHIQ_SET_SERVICE_OPTION_T args; | |
1121 | ||
1122 | if (copy_from_user( | |
1123 | &args, (const void __user *)arg, | |
1124 | sizeof(args)) != 0) { | |
1125 | ret = -EFAULT; | |
1126 | break; | |
1127 | } | |
1128 | ||
1129 | service = find_service_for_instance(instance, args.handle); | |
1130 | if (!service) { | |
1131 | ret = -EINVAL; | |
1132 | break; | |
1133 | } | |
1134 | ||
1135 | status = vchiq_set_service_option( | |
1136 | args.handle, args.option, args.value); | |
1137 | } break; | |
1138 | ||
1139 | case VCHIQ_IOC_DUMP_PHYS_MEM: { | |
1140 | VCHIQ_DUMP_MEM_T args; | |
1141 | ||
1142 | if (copy_from_user | |
1143 | (&args, (const void __user *)arg, | |
1144 | sizeof(args)) != 0) { | |
1145 | ret = -EFAULT; | |
1146 | break; | |
1147 | } | |
1148 | dump_phys_mem(args.virt_addr, args.num_bytes); | |
1149 | } break; | |
1150 | ||
1151 | case VCHIQ_IOC_LIB_VERSION: { | |
1152 | unsigned int lib_version = (unsigned int)arg; | |
1153 | ||
1154 | if (lib_version < VCHIQ_VERSION_MIN) | |
1155 | ret = -EINVAL; | |
1156 | else if (lib_version >= VCHIQ_VERSION_CLOSE_DELIVERED) | |
1157 | instance->use_close_delivered = 1; | |
1158 | } break; | |
1159 | ||
1160 | case VCHIQ_IOC_CLOSE_DELIVERED: { | |
1161 | VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; | |
1162 | ||
1163 | service = find_closed_service_for_instance(instance, handle); | |
1164 | if (service != NULL) { | |
1165 | USER_SERVICE_T *user_service = | |
1166 | (USER_SERVICE_T *)service->base.userdata; | |
1167 | close_delivered(user_service); | |
1168 | } | |
1169 | else | |
1170 | ret = -EINVAL; | |
1171 | } break; | |
1172 | ||
1173 | default: | |
1174 | ret = -ENOTTY; | |
1175 | break; | |
1176 | } | |
1177 | ||
1178 | if (service) | |
1179 | unlock_service(service); | |
1180 | ||
1181 | if (ret == 0) { | |
1182 | if (status == VCHIQ_ERROR) | |
1183 | ret = -EIO; | |
1184 | else if (status == VCHIQ_RETRY) | |
1185 | ret = -EINTR; | |
1186 | } | |
1187 | ||
1188 | if ((status == VCHIQ_SUCCESS) && (ret < 0) && (ret != -EINTR) && | |
1189 | (ret != -EWOULDBLOCK)) | |
1190 | vchiq_log_info(vchiq_arm_log_level, | |
1191 | " ioctl instance %lx, cmd %s -> status %d, %ld", | |
1192 | (unsigned long)instance, | |
1193 | (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ? | |
1194 | ioctl_names[_IOC_NR(cmd)] : | |
1195 | "<invalid>", | |
1196 | status, ret); | |
1197 | else | |
1198 | vchiq_log_trace(vchiq_arm_log_level, | |
1199 | " ioctl instance %lx, cmd %s -> status %d, %ld", | |
1200 | (unsigned long)instance, | |
1201 | (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ? | |
1202 | ioctl_names[_IOC_NR(cmd)] : | |
1203 | "<invalid>", | |
1204 | status, ret); | |
1205 | ||
1206 | return ret; | |
1207 | } | |
1208 | ||
1209 | /**************************************************************************** | |
1210 | * | |
1211 | * vchiq_open | |
1212 | * | |
1213 | ***************************************************************************/ | |
1214 | ||
1215 | static int | |
1216 | vchiq_open(struct inode *inode, struct file *file) | |
1217 | { | |
1218 | int dev = iminor(inode) & 0x0f; | |
1219 | vchiq_log_info(vchiq_arm_log_level, "vchiq_open"); | |
1220 | switch (dev) { | |
1221 | case VCHIQ_MINOR: { | |
1222 | int ret; | |
1223 | VCHIQ_STATE_T *state = vchiq_get_state(); | |
1224 | VCHIQ_INSTANCE_T instance; | |
1225 | ||
1226 | if (!state) { | |
1227 | vchiq_log_error(vchiq_arm_log_level, | |
1228 | "vchiq has no connection to VideoCore"); | |
1229 | return -ENOTCONN; | |
1230 | } | |
1231 | ||
1232 | instance = kzalloc(sizeof(*instance), GFP_KERNEL); | |
1233 | if (!instance) | |
1234 | return -ENOMEM; | |
1235 | ||
1236 | instance->state = state; | |
1237 | instance->pid = current->tgid; | |
1238 | ||
1239 | ret = vchiq_debugfs_add_instance(instance); | |
1240 | if (ret != 0) { | |
1241 | kfree(instance); | |
1242 | return ret; | |
1243 | } | |
1244 | ||
1245 | sema_init(&instance->insert_event, 0); | |
1246 | sema_init(&instance->remove_event, 0); | |
1247 | mutex_init(&instance->completion_mutex); | |
1248 | mutex_init(&instance->bulk_waiter_list_mutex); | |
1249 | INIT_LIST_HEAD(&instance->bulk_waiter_list); | |
1250 | ||
1251 | file->private_data = instance; | |
1252 | } break; | |
1253 | ||
1254 | default: | |
1255 | vchiq_log_error(vchiq_arm_log_level, | |
1256 | "Unknown minor device: %d", dev); | |
1257 | return -ENXIO; | |
1258 | } | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | /**************************************************************************** | |
1264 | * | |
1265 | * vchiq_release | |
1266 | * | |
1267 | ***************************************************************************/ | |
1268 | ||
1269 | static int | |
1270 | vchiq_release(struct inode *inode, struct file *file) | |
1271 | { | |
1272 | int dev = iminor(inode) & 0x0f; | |
1273 | int ret = 0; | |
1274 | switch (dev) { | |
1275 | case VCHIQ_MINOR: { | |
1276 | VCHIQ_INSTANCE_T instance = file->private_data; | |
1277 | VCHIQ_STATE_T *state = vchiq_get_state(); | |
1278 | VCHIQ_SERVICE_T *service; | |
1279 | int i; | |
1280 | ||
1281 | vchiq_log_info(vchiq_arm_log_level, | |
1282 | "vchiq_release: instance=%lx", | |
1283 | (unsigned long)instance); | |
1284 | ||
1285 | if (!state) { | |
1286 | ret = -EPERM; | |
1287 | goto out; | |
1288 | } | |
1289 | ||
1290 | /* Ensure videocore is awake to allow termination. */ | |
1291 | vchiq_use_internal(instance->state, NULL, | |
1292 | USE_TYPE_VCHIQ); | |
1293 | ||
1294 | mutex_lock(&instance->completion_mutex); | |
1295 | ||
1296 | /* Wake the completion thread and ask it to exit */ | |
1297 | instance->closing = 1; | |
1298 | up(&instance->insert_event); | |
1299 | ||
1300 | mutex_unlock(&instance->completion_mutex); | |
1301 | ||
1302 | /* Wake the slot handler if the completion queue is full. */ | |
1303 | up(&instance->remove_event); | |
1304 | ||
1305 | /* Mark all services for termination... */ | |
1306 | i = 0; | |
1307 | while ((service = next_service_by_instance(state, instance, | |
1308 | &i)) != NULL) { | |
1309 | USER_SERVICE_T *user_service = service->base.userdata; | |
1310 | ||
1311 | /* Wake the slot handler if the msg queue is full. */ | |
1312 | up(&user_service->remove_event); | |
1313 | ||
1314 | vchiq_terminate_service_internal(service); | |
1315 | unlock_service(service); | |
1316 | } | |
1317 | ||
1318 | /* ...and wait for them to die */ | |
1319 | i = 0; | |
1320 | while ((service = next_service_by_instance(state, instance, &i)) | |
1321 | != NULL) { | |
1322 | USER_SERVICE_T *user_service = service->base.userdata; | |
1323 | ||
1324 | down(&service->remove_event); | |
1325 | ||
1326 | BUG_ON(service->srvstate != VCHIQ_SRVSTATE_FREE); | |
1327 | ||
1328 | spin_lock(&msg_queue_spinlock); | |
1329 | ||
1330 | while (user_service->msg_remove != | |
1331 | user_service->msg_insert) { | |
1332 | VCHIQ_HEADER_T *header = user_service-> | |
1333 | msg_queue[user_service->msg_remove & | |
1334 | (MSG_QUEUE_SIZE - 1)]; | |
1335 | user_service->msg_remove++; | |
1336 | spin_unlock(&msg_queue_spinlock); | |
1337 | ||
1338 | if (header) | |
1339 | vchiq_release_message( | |
1340 | service->handle, | |
1341 | header); | |
1342 | spin_lock(&msg_queue_spinlock); | |
1343 | } | |
1344 | ||
1345 | spin_unlock(&msg_queue_spinlock); | |
1346 | ||
1347 | unlock_service(service); | |
1348 | } | |
1349 | ||
1350 | /* Release any closed services */ | |
1351 | while (instance->completion_remove != | |
1352 | instance->completion_insert) { | |
1353 | VCHIQ_COMPLETION_DATA_T *completion; | |
1354 | VCHIQ_SERVICE_T *service; | |
1355 | completion = &instance->completions[ | |
1356 | instance->completion_remove & | |
1357 | (MAX_COMPLETIONS - 1)]; | |
1358 | service = completion->service_userdata; | |
1359 | if (completion->reason == VCHIQ_SERVICE_CLOSED) | |
1360 | { | |
1361 | USER_SERVICE_T *user_service = | |
1362 | service->base.userdata; | |
1363 | ||
1364 | /* Wake any blocked user-thread */ | |
1365 | if (instance->use_close_delivered) | |
1366 | up(&user_service->close_event); | |
1367 | unlock_service(service); | |
1368 | } | |
1369 | instance->completion_remove++; | |
1370 | } | |
1371 | ||
1372 | /* Release the PEER service count. */ | |
1373 | vchiq_release_internal(instance->state, NULL); | |
1374 | ||
1375 | { | |
1376 | struct list_head *pos, *next; | |
1377 | list_for_each_safe(pos, next, | |
1378 | &instance->bulk_waiter_list) { | |
1379 | struct bulk_waiter_node *waiter; | |
1380 | waiter = list_entry(pos, | |
1381 | struct bulk_waiter_node, | |
1382 | list); | |
1383 | list_del(pos); | |
1384 | vchiq_log_info(vchiq_arm_log_level, | |
df044ebf GKH |
1385 | "bulk_waiter - cleaned up %pK for pid %d", |
1386 | waiter, waiter->pid); | |
71bad7f0 | 1387 | kfree(waiter); |
1388 | } | |
1389 | } | |
1390 | ||
1391 | vchiq_debugfs_remove_instance(instance); | |
1392 | ||
1393 | kfree(instance); | |
1394 | file->private_data = NULL; | |
1395 | } break; | |
1396 | ||
1397 | default: | |
1398 | vchiq_log_error(vchiq_arm_log_level, | |
1399 | "Unknown minor device: %d", dev); | |
1400 | ret = -ENXIO; | |
1401 | } | |
1402 | ||
1403 | out: | |
1404 | return ret; | |
1405 | } | |
1406 | ||
1407 | /**************************************************************************** | |
1408 | * | |
1409 | * vchiq_dump | |
1410 | * | |
1411 | ***************************************************************************/ | |
1412 | ||
1413 | void | |
1414 | vchiq_dump(void *dump_context, const char *str, int len) | |
1415 | { | |
1416 | DUMP_CONTEXT_T *context = (DUMP_CONTEXT_T *)dump_context; | |
1417 | ||
1418 | if (context->actual < context->space) { | |
1419 | int copy_bytes; | |
1420 | if (context->offset > 0) { | |
1421 | int skip_bytes = min(len, (int)context->offset); | |
1422 | str += skip_bytes; | |
1423 | len -= skip_bytes; | |
1424 | context->offset -= skip_bytes; | |
1425 | if (context->offset > 0) | |
1426 | return; | |
1427 | } | |
1428 | copy_bytes = min(len, (int)(context->space - context->actual)); | |
1429 | if (copy_bytes == 0) | |
1430 | return; | |
1431 | if (copy_to_user(context->buf + context->actual, str, | |
1432 | copy_bytes)) | |
1433 | context->actual = -EFAULT; | |
1434 | context->actual += copy_bytes; | |
1435 | len -= copy_bytes; | |
1436 | ||
1437 | /* If tne terminating NUL is included in the length, then it | |
1438 | ** marks the end of a line and should be replaced with a | |
1439 | ** carriage return. */ | |
1440 | if ((len == 0) && (str[copy_bytes - 1] == '\0')) { | |
1441 | char cr = '\n'; | |
1442 | if (copy_to_user(context->buf + context->actual - 1, | |
1443 | &cr, 1)) | |
1444 | context->actual = -EFAULT; | |
1445 | } | |
1446 | } | |
1447 | } | |
1448 | ||
1449 | /**************************************************************************** | |
1450 | * | |
1451 | * vchiq_dump_platform_instance_state | |
1452 | * | |
1453 | ***************************************************************************/ | |
1454 | ||
1455 | void | |
1456 | vchiq_dump_platform_instances(void *dump_context) | |
1457 | { | |
1458 | VCHIQ_STATE_T *state = vchiq_get_state(); | |
1459 | char buf[80]; | |
1460 | int len; | |
1461 | int i; | |
1462 | ||
1463 | /* There is no list of instances, so instead scan all services, | |
1464 | marking those that have been dumped. */ | |
1465 | ||
1466 | for (i = 0; i < state->unused_service; i++) { | |
1467 | VCHIQ_SERVICE_T *service = state->services[i]; | |
1468 | VCHIQ_INSTANCE_T instance; | |
1469 | ||
1470 | if (service && (service->base.callback == service_callback)) { | |
1471 | instance = service->instance; | |
1472 | if (instance) | |
1473 | instance->mark = 0; | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | for (i = 0; i < state->unused_service; i++) { | |
1478 | VCHIQ_SERVICE_T *service = state->services[i]; | |
1479 | VCHIQ_INSTANCE_T instance; | |
1480 | ||
1481 | if (service && (service->base.callback == service_callback)) { | |
1482 | instance = service->instance; | |
1483 | if (instance && !instance->mark) { | |
1484 | len = snprintf(buf, sizeof(buf), | |
df044ebf GKH |
1485 | "Instance %pK: pid %d,%s completions %d/%d", |
1486 | instance, instance->pid, | |
71bad7f0 | 1487 | instance->connected ? " connected, " : |
1488 | "", | |
1489 | instance->completion_insert - | |
1490 | instance->completion_remove, | |
1491 | MAX_COMPLETIONS); | |
1492 | ||
1493 | vchiq_dump(dump_context, buf, len + 1); | |
1494 | ||
1495 | instance->mark = 1; | |
1496 | } | |
1497 | } | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | /**************************************************************************** | |
1502 | * | |
1503 | * vchiq_dump_platform_service_state | |
1504 | * | |
1505 | ***************************************************************************/ | |
1506 | ||
1507 | void | |
1508 | vchiq_dump_platform_service_state(void *dump_context, VCHIQ_SERVICE_T *service) | |
1509 | { | |
1510 | USER_SERVICE_T *user_service = (USER_SERVICE_T *)service->base.userdata; | |
1511 | char buf[80]; | |
1512 | int len; | |
1513 | ||
df044ebf | 1514 | len = snprintf(buf, sizeof(buf), " instance %pK", service->instance); |
71bad7f0 | 1515 | |
1516 | if ((service->base.callback == service_callback) && | |
1517 | user_service->is_vchi) { | |
1518 | len += snprintf(buf + len, sizeof(buf) - len, | |
1519 | ", %d/%d messages", | |
1520 | user_service->msg_insert - user_service->msg_remove, | |
1521 | MSG_QUEUE_SIZE); | |
1522 | ||
1523 | if (user_service->dequeue_pending) | |
1524 | len += snprintf(buf + len, sizeof(buf) - len, | |
1525 | " (dequeue pending)"); | |
1526 | } | |
1527 | ||
1528 | vchiq_dump(dump_context, buf, len + 1); | |
1529 | } | |
1530 | ||
1531 | /**************************************************************************** | |
1532 | * | |
1533 | * dump_user_mem | |
1534 | * | |
1535 | ***************************************************************************/ | |
1536 | ||
1537 | static void | |
1538 | dump_phys_mem(void *virt_addr, uint32_t num_bytes) | |
1539 | { | |
1540 | int rc; | |
1541 | uint8_t *end_virt_addr = virt_addr + num_bytes; | |
1542 | int num_pages; | |
1543 | int offset; | |
1544 | int end_offset; | |
1545 | int page_idx; | |
1546 | int prev_idx; | |
1547 | struct page *page; | |
1548 | struct page **pages; | |
1549 | uint8_t *kmapped_virt_ptr; | |
1550 | ||
1551 | /* Align virtAddr and endVirtAddr to 16 byte boundaries. */ | |
1552 | ||
1553 | virt_addr = (void *)((unsigned long)virt_addr & ~0x0fuL); | |
1554 | end_virt_addr = (void *)(((unsigned long)end_virt_addr + 15uL) & | |
1555 | ~0x0fuL); | |
1556 | ||
1557 | offset = (int)(long)virt_addr & (PAGE_SIZE - 1); | |
1558 | end_offset = (int)(long)end_virt_addr & (PAGE_SIZE - 1); | |
1559 | ||
1560 | num_pages = (offset + num_bytes + PAGE_SIZE - 1) / PAGE_SIZE; | |
1561 | ||
1562 | pages = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); | |
1563 | if (pages == NULL) { | |
1564 | vchiq_log_error(vchiq_arm_log_level, | |
1565 | "Unable to allocation memory for %d pages\n", | |
1566 | num_pages); | |
1567 | return; | |
1568 | } | |
1569 | ||
1570 | down_read(¤t->mm->mmap_sem); | |
166beccd | 1571 | rc = get_user_pages( |
71bad7f0 | 1572 | (unsigned long)virt_addr, /* start */ |
1573 | num_pages, /* len */ | |
768ae309 | 1574 | 0, /* gup_flags */ |
71bad7f0 | 1575 | pages, /* pages (array of page pointers) */ |
1576 | NULL); /* vmas */ | |
1577 | up_read(¤t->mm->mmap_sem); | |
1578 | ||
1579 | prev_idx = -1; | |
1580 | page = NULL; | |
1581 | ||
0feb1ed5 SW |
1582 | if (rc < 0) { |
1583 | vchiq_log_error(vchiq_arm_log_level, | |
1584 | "Failed to get user pages: %d\n", rc); | |
1585 | goto out; | |
1586 | } | |
1587 | ||
71bad7f0 | 1588 | while (offset < end_offset) { |
1589 | ||
1590 | int page_offset = offset % PAGE_SIZE; | |
1591 | page_idx = offset / PAGE_SIZE; | |
1592 | ||
1593 | if (page_idx != prev_idx) { | |
1594 | ||
1595 | if (page != NULL) | |
1596 | kunmap(page); | |
1597 | page = pages[page_idx]; | |
1598 | kmapped_virt_ptr = kmap(page); | |
1599 | ||
1600 | prev_idx = page_idx; | |
1601 | } | |
1602 | ||
1603 | if (vchiq_arm_log_level >= VCHIQ_LOG_TRACE) | |
1604 | vchiq_log_dump_mem("ph", | |
1605 | (uint32_t)(unsigned long)&kmapped_virt_ptr[ | |
1606 | page_offset], | |
1607 | &kmapped_virt_ptr[page_offset], 16); | |
1608 | ||
1609 | offset += 16; | |
1610 | } | |
0feb1ed5 SW |
1611 | |
1612 | out: | |
71bad7f0 | 1613 | if (page != NULL) |
1614 | kunmap(page); | |
1615 | ||
1616 | for (page_idx = 0; page_idx < num_pages; page_idx++) | |
232664b3 | 1617 | put_page(pages[page_idx]); |
71bad7f0 | 1618 | |
1619 | kfree(pages); | |
1620 | } | |
1621 | ||
1622 | /**************************************************************************** | |
1623 | * | |
1624 | * vchiq_read | |
1625 | * | |
1626 | ***************************************************************************/ | |
1627 | ||
1628 | static ssize_t | |
1629 | vchiq_read(struct file *file, char __user *buf, | |
1630 | size_t count, loff_t *ppos) | |
1631 | { | |
1632 | DUMP_CONTEXT_T context; | |
1633 | context.buf = buf; | |
1634 | context.actual = 0; | |
1635 | context.space = count; | |
1636 | context.offset = *ppos; | |
1637 | ||
1638 | vchiq_dump_state(&context, &g_state); | |
1639 | ||
1640 | *ppos += context.actual; | |
1641 | ||
1642 | return context.actual; | |
1643 | } | |
1644 | ||
1645 | VCHIQ_STATE_T * | |
1646 | vchiq_get_state(void) | |
1647 | { | |
1648 | ||
1649 | if (g_state.remote == NULL) | |
1650 | printk(KERN_ERR "%s: g_state.remote == NULL\n", __func__); | |
1651 | else if (g_state.remote->initialised != 1) | |
1652 | printk(KERN_NOTICE "%s: g_state.remote->initialised != 1 (%d)\n", | |
1653 | __func__, g_state.remote->initialised); | |
1654 | ||
1655 | return ((g_state.remote != NULL) && | |
1656 | (g_state.remote->initialised == 1)) ? &g_state : NULL; | |
1657 | } | |
1658 | ||
1659 | static const struct file_operations | |
1660 | vchiq_fops = { | |
1661 | .owner = THIS_MODULE, | |
1662 | .unlocked_ioctl = vchiq_ioctl, | |
1663 | .open = vchiq_open, | |
1664 | .release = vchiq_release, | |
1665 | .read = vchiq_read | |
1666 | }; | |
1667 | ||
1668 | /* | |
1669 | * Autosuspend related functionality | |
1670 | */ | |
1671 | ||
1672 | int | |
1673 | vchiq_videocore_wanted(VCHIQ_STATE_T *state) | |
1674 | { | |
1675 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
1676 | if (!arm_state) | |
1677 | /* autosuspend not supported - always return wanted */ | |
1678 | return 1; | |
1679 | else if (arm_state->blocked_count) | |
1680 | return 1; | |
1681 | else if (!arm_state->videocore_use_count) | |
1682 | /* usage count zero - check for override unless we're forcing */ | |
1683 | if (arm_state->resume_blocked) | |
1684 | return 0; | |
1685 | else | |
1686 | return vchiq_platform_videocore_wanted(state); | |
1687 | else | |
1688 | /* non-zero usage count - videocore still required */ | |
1689 | return 1; | |
1690 | } | |
1691 | ||
1692 | static VCHIQ_STATUS_T | |
1693 | vchiq_keepalive_vchiq_callback(VCHIQ_REASON_T reason, | |
1694 | VCHIQ_HEADER_T *header, | |
1695 | VCHIQ_SERVICE_HANDLE_T service_user, | |
1696 | void *bulk_user) | |
1697 | { | |
1698 | vchiq_log_error(vchiq_susp_log_level, | |
1699 | "%s callback reason %d", __func__, reason); | |
1700 | return 0; | |
1701 | } | |
1702 | ||
1703 | static int | |
1704 | vchiq_keepalive_thread_func(void *v) | |
1705 | { | |
1706 | VCHIQ_STATE_T *state = (VCHIQ_STATE_T *) v; | |
1707 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
1708 | ||
1709 | VCHIQ_STATUS_T status; | |
1710 | VCHIQ_INSTANCE_T instance; | |
1711 | VCHIQ_SERVICE_HANDLE_T ka_handle; | |
1712 | ||
1713 | VCHIQ_SERVICE_PARAMS_T params = { | |
1714 | .fourcc = VCHIQ_MAKE_FOURCC('K', 'E', 'E', 'P'), | |
1715 | .callback = vchiq_keepalive_vchiq_callback, | |
1716 | .version = KEEPALIVE_VER, | |
1717 | .version_min = KEEPALIVE_VER_MIN | |
1718 | }; | |
1719 | ||
1720 | status = vchiq_initialise(&instance); | |
1721 | if (status != VCHIQ_SUCCESS) { | |
1722 | vchiq_log_error(vchiq_susp_log_level, | |
1723 | "%s vchiq_initialise failed %d", __func__, status); | |
1724 | goto exit; | |
1725 | } | |
1726 | ||
1727 | status = vchiq_connect(instance); | |
1728 | if (status != VCHIQ_SUCCESS) { | |
1729 | vchiq_log_error(vchiq_susp_log_level, | |
1730 | "%s vchiq_connect failed %d", __func__, status); | |
1731 | goto shutdown; | |
1732 | } | |
1733 | ||
1734 | status = vchiq_add_service(instance, ¶ms, &ka_handle); | |
1735 | if (status != VCHIQ_SUCCESS) { | |
1736 | vchiq_log_error(vchiq_susp_log_level, | |
1737 | "%s vchiq_open_service failed %d", __func__, status); | |
1738 | goto shutdown; | |
1739 | } | |
1740 | ||
1741 | while (1) { | |
1742 | long rc = 0, uc = 0; | |
1743 | if (wait_for_completion_interruptible(&arm_state->ka_evt) | |
1744 | != 0) { | |
1745 | vchiq_log_error(vchiq_susp_log_level, | |
1746 | "%s interrupted", __func__); | |
1747 | flush_signals(current); | |
1748 | continue; | |
1749 | } | |
1750 | ||
1751 | /* read and clear counters. Do release_count then use_count to | |
1752 | * prevent getting more releases than uses */ | |
1753 | rc = atomic_xchg(&arm_state->ka_release_count, 0); | |
1754 | uc = atomic_xchg(&arm_state->ka_use_count, 0); | |
1755 | ||
1756 | /* Call use/release service the requisite number of times. | |
1757 | * Process use before release so use counts don't go negative */ | |
1758 | while (uc--) { | |
1759 | atomic_inc(&arm_state->ka_use_ack_count); | |
1760 | status = vchiq_use_service(ka_handle); | |
1761 | if (status != VCHIQ_SUCCESS) { | |
1762 | vchiq_log_error(vchiq_susp_log_level, | |
1763 | "%s vchiq_use_service error %d", | |
1764 | __func__, status); | |
1765 | } | |
1766 | } | |
1767 | while (rc--) { | |
1768 | status = vchiq_release_service(ka_handle); | |
1769 | if (status != VCHIQ_SUCCESS) { | |
1770 | vchiq_log_error(vchiq_susp_log_level, | |
1771 | "%s vchiq_release_service error %d", | |
1772 | __func__, status); | |
1773 | } | |
1774 | } | |
1775 | } | |
1776 | ||
1777 | shutdown: | |
1778 | vchiq_shutdown(instance); | |
1779 | exit: | |
1780 | return 0; | |
1781 | } | |
1782 | ||
1783 | ||
1784 | ||
1785 | VCHIQ_STATUS_T | |
1786 | vchiq_arm_init_state(VCHIQ_STATE_T *state, VCHIQ_ARM_STATE_T *arm_state) | |
1787 | { | |
1788 | VCHIQ_STATUS_T status = VCHIQ_SUCCESS; | |
1789 | ||
1790 | if (arm_state) { | |
1791 | rwlock_init(&arm_state->susp_res_lock); | |
1792 | ||
1793 | init_completion(&arm_state->ka_evt); | |
1794 | atomic_set(&arm_state->ka_use_count, 0); | |
1795 | atomic_set(&arm_state->ka_use_ack_count, 0); | |
1796 | atomic_set(&arm_state->ka_release_count, 0); | |
1797 | ||
1798 | init_completion(&arm_state->vc_suspend_complete); | |
1799 | ||
1800 | init_completion(&arm_state->vc_resume_complete); | |
1801 | /* Initialise to 'done' state. We only want to block on resume | |
1802 | * completion while videocore is suspended. */ | |
1803 | set_resume_state(arm_state, VC_RESUME_RESUMED); | |
1804 | ||
1805 | init_completion(&arm_state->resume_blocker); | |
1806 | /* Initialise to 'done' state. We only want to block on this | |
1807 | * completion while resume is blocked */ | |
1808 | complete_all(&arm_state->resume_blocker); | |
1809 | ||
1810 | init_completion(&arm_state->blocked_blocker); | |
1811 | /* Initialise to 'done' state. We only want to block on this | |
1812 | * completion while things are waiting on the resume blocker */ | |
1813 | complete_all(&arm_state->blocked_blocker); | |
1814 | ||
1815 | arm_state->suspend_timer_timeout = SUSPEND_TIMER_TIMEOUT_MS; | |
1816 | arm_state->suspend_timer_running = 0; | |
1817 | init_timer(&arm_state->suspend_timer); | |
1818 | arm_state->suspend_timer.data = (unsigned long)(state); | |
1819 | arm_state->suspend_timer.function = suspend_timer_callback; | |
1820 | ||
1821 | arm_state->first_connect = 0; | |
1822 | ||
1823 | } | |
1824 | return status; | |
1825 | } | |
1826 | ||
1827 | /* | |
1828 | ** Functions to modify the state variables; | |
1829 | ** set_suspend_state | |
1830 | ** set_resume_state | |
1831 | ** | |
1832 | ** There are more state variables than we might like, so ensure they remain in | |
1833 | ** step. Suspend and resume state are maintained separately, since most of | |
1834 | ** these state machines can operate independently. However, there are a few | |
1835 | ** states where state transitions in one state machine cause a reset to the | |
1836 | ** other state machine. In addition, there are some completion events which | |
1837 | ** need to occur on state machine reset and end-state(s), so these are also | |
1838 | ** dealt with in these functions. | |
1839 | ** | |
1840 | ** In all states we set the state variable according to the input, but in some | |
1841 | ** cases we perform additional steps outlined below; | |
1842 | ** | |
1843 | ** VC_SUSPEND_IDLE - Initialise the suspend completion at the same time. | |
1844 | ** The suspend completion is completed after any suspend | |
1845 | ** attempt. When we reset the state machine we also reset | |
1846 | ** the completion. This reset occurs when videocore is | |
1847 | ** resumed, and also if we initiate suspend after a suspend | |
1848 | ** failure. | |
1849 | ** | |
1850 | ** VC_SUSPEND_IN_PROGRESS - This state is considered the point of no return for | |
1851 | ** suspend - ie from this point on we must try to suspend | |
1852 | ** before resuming can occur. We therefore also reset the | |
1853 | ** resume state machine to VC_RESUME_IDLE in this state. | |
1854 | ** | |
1855 | ** VC_SUSPEND_SUSPENDED - Suspend has completed successfully. Also call | |
1856 | ** complete_all on the suspend completion to notify | |
1857 | ** anything waiting for suspend to happen. | |
1858 | ** | |
1859 | ** VC_SUSPEND_REJECTED - Videocore rejected suspend. Videocore will also | |
1860 | ** initiate resume, so no need to alter resume state. | |
1861 | ** We call complete_all on the suspend completion to notify | |
1862 | ** of suspend rejection. | |
1863 | ** | |
1864 | ** VC_SUSPEND_FAILED - We failed to initiate videocore suspend. We notify the | |
1865 | ** suspend completion and reset the resume state machine. | |
1866 | ** | |
1867 | ** VC_RESUME_IDLE - Initialise the resume completion at the same time. The | |
1868 | ** resume completion is in it's 'done' state whenever | |
1869 | ** videcore is running. Therfore, the VC_RESUME_IDLE state | |
1870 | ** implies that videocore is suspended. | |
1871 | ** Hence, any thread which needs to wait until videocore is | |
1872 | ** running can wait on this completion - it will only block | |
1873 | ** if videocore is suspended. | |
1874 | ** | |
1875 | ** VC_RESUME_RESUMED - Resume has completed successfully. Videocore is running. | |
1876 | ** Call complete_all on the resume completion to unblock | |
1877 | ** any threads waiting for resume. Also reset the suspend | |
1878 | ** state machine to it's idle state. | |
1879 | ** | |
1880 | ** VC_RESUME_FAILED - Currently unused - no mechanism to fail resume exists. | |
1881 | */ | |
1882 | ||
1883 | void | |
1884 | set_suspend_state(VCHIQ_ARM_STATE_T *arm_state, | |
1885 | enum vc_suspend_status new_state) | |
1886 | { | |
1887 | /* set the state in all cases */ | |
1888 | arm_state->vc_suspend_state = new_state; | |
1889 | ||
1890 | /* state specific additional actions */ | |
1891 | switch (new_state) { | |
1892 | case VC_SUSPEND_FORCE_CANCELED: | |
1893 | complete_all(&arm_state->vc_suspend_complete); | |
1894 | break; | |
1895 | case VC_SUSPEND_REJECTED: | |
1896 | complete_all(&arm_state->vc_suspend_complete); | |
1897 | break; | |
1898 | case VC_SUSPEND_FAILED: | |
1899 | complete_all(&arm_state->vc_suspend_complete); | |
1900 | arm_state->vc_resume_state = VC_RESUME_RESUMED; | |
1901 | complete_all(&arm_state->vc_resume_complete); | |
1902 | break; | |
1903 | case VC_SUSPEND_IDLE: | |
1904 | reinit_completion(&arm_state->vc_suspend_complete); | |
1905 | break; | |
1906 | case VC_SUSPEND_REQUESTED: | |
1907 | break; | |
1908 | case VC_SUSPEND_IN_PROGRESS: | |
1909 | set_resume_state(arm_state, VC_RESUME_IDLE); | |
1910 | break; | |
1911 | case VC_SUSPEND_SUSPENDED: | |
1912 | complete_all(&arm_state->vc_suspend_complete); | |
1913 | break; | |
1914 | default: | |
1915 | BUG(); | |
1916 | break; | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | void | |
1921 | set_resume_state(VCHIQ_ARM_STATE_T *arm_state, | |
1922 | enum vc_resume_status new_state) | |
1923 | { | |
1924 | /* set the state in all cases */ | |
1925 | arm_state->vc_resume_state = new_state; | |
1926 | ||
1927 | /* state specific additional actions */ | |
1928 | switch (new_state) { | |
1929 | case VC_RESUME_FAILED: | |
1930 | break; | |
1931 | case VC_RESUME_IDLE: | |
1932 | reinit_completion(&arm_state->vc_resume_complete); | |
1933 | break; | |
1934 | case VC_RESUME_REQUESTED: | |
1935 | break; | |
1936 | case VC_RESUME_IN_PROGRESS: | |
1937 | break; | |
1938 | case VC_RESUME_RESUMED: | |
1939 | complete_all(&arm_state->vc_resume_complete); | |
1940 | set_suspend_state(arm_state, VC_SUSPEND_IDLE); | |
1941 | break; | |
1942 | default: | |
1943 | BUG(); | |
1944 | break; | |
1945 | } | |
1946 | } | |
1947 | ||
1948 | ||
1949 | /* should be called with the write lock held */ | |
1950 | inline void | |
1951 | start_suspend_timer(VCHIQ_ARM_STATE_T *arm_state) | |
1952 | { | |
1953 | del_timer(&arm_state->suspend_timer); | |
1954 | arm_state->suspend_timer.expires = jiffies + | |
1955 | msecs_to_jiffies(arm_state-> | |
1956 | suspend_timer_timeout); | |
1957 | add_timer(&arm_state->suspend_timer); | |
1958 | arm_state->suspend_timer_running = 1; | |
1959 | } | |
1960 | ||
1961 | /* should be called with the write lock held */ | |
1962 | static inline void | |
1963 | stop_suspend_timer(VCHIQ_ARM_STATE_T *arm_state) | |
1964 | { | |
1965 | if (arm_state->suspend_timer_running) { | |
1966 | del_timer(&arm_state->suspend_timer); | |
1967 | arm_state->suspend_timer_running = 0; | |
1968 | } | |
1969 | } | |
1970 | ||
1971 | static inline int | |
1972 | need_resume(VCHIQ_STATE_T *state) | |
1973 | { | |
1974 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
1975 | return (arm_state->vc_suspend_state > VC_SUSPEND_IDLE) && | |
1976 | (arm_state->vc_resume_state < VC_RESUME_REQUESTED) && | |
1977 | vchiq_videocore_wanted(state); | |
1978 | } | |
1979 | ||
1980 | static int | |
1981 | block_resume(VCHIQ_ARM_STATE_T *arm_state) | |
1982 | { | |
1983 | int status = VCHIQ_SUCCESS; | |
1984 | const unsigned long timeout_val = | |
1985 | msecs_to_jiffies(FORCE_SUSPEND_TIMEOUT_MS); | |
1986 | int resume_count = 0; | |
1987 | ||
1988 | /* Allow any threads which were blocked by the last force suspend to | |
1989 | * complete if they haven't already. Only give this one shot; if | |
1990 | * blocked_count is incremented after blocked_blocker is completed | |
1991 | * (which only happens when blocked_count hits 0) then those threads | |
1992 | * will have to wait until next time around */ | |
1993 | if (arm_state->blocked_count) { | |
1994 | reinit_completion(&arm_state->blocked_blocker); | |
1995 | write_unlock_bh(&arm_state->susp_res_lock); | |
1996 | vchiq_log_info(vchiq_susp_log_level, "%s wait for previously " | |
1997 | "blocked clients", __func__); | |
1998 | if (wait_for_completion_interruptible_timeout( | |
1999 | &arm_state->blocked_blocker, timeout_val) | |
2000 | <= 0) { | |
2001 | vchiq_log_error(vchiq_susp_log_level, "%s wait for " | |
2002 | "previously blocked clients failed" , __func__); | |
2003 | status = VCHIQ_ERROR; | |
2004 | write_lock_bh(&arm_state->susp_res_lock); | |
2005 | goto out; | |
2006 | } | |
2007 | vchiq_log_info(vchiq_susp_log_level, "%s previously blocked " | |
2008 | "clients resumed", __func__); | |
2009 | write_lock_bh(&arm_state->susp_res_lock); | |
2010 | } | |
2011 | ||
2012 | /* We need to wait for resume to complete if it's in process */ | |
2013 | while (arm_state->vc_resume_state != VC_RESUME_RESUMED && | |
2014 | arm_state->vc_resume_state > VC_RESUME_IDLE) { | |
2015 | if (resume_count > 1) { | |
2016 | status = VCHIQ_ERROR; | |
2017 | vchiq_log_error(vchiq_susp_log_level, "%s waited too " | |
2018 | "many times for resume" , __func__); | |
2019 | goto out; | |
2020 | } | |
2021 | write_unlock_bh(&arm_state->susp_res_lock); | |
2022 | vchiq_log_info(vchiq_susp_log_level, "%s wait for resume", | |
2023 | __func__); | |
2024 | if (wait_for_completion_interruptible_timeout( | |
2025 | &arm_state->vc_resume_complete, timeout_val) | |
2026 | <= 0) { | |
2027 | vchiq_log_error(vchiq_susp_log_level, "%s wait for " | |
2028 | "resume failed (%s)", __func__, | |
2029 | resume_state_names[arm_state->vc_resume_state + | |
2030 | VC_RESUME_NUM_OFFSET]); | |
2031 | status = VCHIQ_ERROR; | |
2032 | write_lock_bh(&arm_state->susp_res_lock); | |
2033 | goto out; | |
2034 | } | |
2035 | vchiq_log_info(vchiq_susp_log_level, "%s resumed", __func__); | |
2036 | write_lock_bh(&arm_state->susp_res_lock); | |
2037 | resume_count++; | |
2038 | } | |
2039 | reinit_completion(&arm_state->resume_blocker); | |
2040 | arm_state->resume_blocked = 1; | |
2041 | ||
2042 | out: | |
2043 | return status; | |
2044 | } | |
2045 | ||
2046 | static inline void | |
2047 | unblock_resume(VCHIQ_ARM_STATE_T *arm_state) | |
2048 | { | |
2049 | complete_all(&arm_state->resume_blocker); | |
2050 | arm_state->resume_blocked = 0; | |
2051 | } | |
2052 | ||
2053 | /* Initiate suspend via slot handler. Should be called with the write lock | |
2054 | * held */ | |
2055 | VCHIQ_STATUS_T | |
2056 | vchiq_arm_vcsuspend(VCHIQ_STATE_T *state) | |
2057 | { | |
2058 | VCHIQ_STATUS_T status = VCHIQ_ERROR; | |
2059 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2060 | ||
2061 | if (!arm_state) | |
2062 | goto out; | |
2063 | ||
2064 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2065 | status = VCHIQ_SUCCESS; | |
2066 | ||
2067 | ||
2068 | switch (arm_state->vc_suspend_state) { | |
2069 | case VC_SUSPEND_REQUESTED: | |
2070 | vchiq_log_info(vchiq_susp_log_level, "%s: suspend already " | |
2071 | "requested", __func__); | |
2072 | break; | |
2073 | case VC_SUSPEND_IN_PROGRESS: | |
2074 | vchiq_log_info(vchiq_susp_log_level, "%s: suspend already in " | |
2075 | "progress", __func__); | |
2076 | break; | |
2077 | ||
2078 | default: | |
2079 | /* We don't expect to be in other states, so log but continue | |
2080 | * anyway */ | |
2081 | vchiq_log_error(vchiq_susp_log_level, | |
2082 | "%s unexpected suspend state %s", __func__, | |
2083 | suspend_state_names[arm_state->vc_suspend_state + | |
2084 | VC_SUSPEND_NUM_OFFSET]); | |
2085 | /* fall through */ | |
2086 | case VC_SUSPEND_REJECTED: | |
2087 | case VC_SUSPEND_FAILED: | |
2088 | /* Ensure any idle state actions have been run */ | |
2089 | set_suspend_state(arm_state, VC_SUSPEND_IDLE); | |
2090 | /* fall through */ | |
2091 | case VC_SUSPEND_IDLE: | |
2092 | vchiq_log_info(vchiq_susp_log_level, | |
2093 | "%s: suspending", __func__); | |
2094 | set_suspend_state(arm_state, VC_SUSPEND_REQUESTED); | |
2095 | /* kick the slot handler thread to initiate suspend */ | |
2096 | request_poll(state, NULL, 0); | |
2097 | break; | |
2098 | } | |
2099 | ||
2100 | out: | |
2101 | vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, status); | |
2102 | return status; | |
2103 | } | |
2104 | ||
2105 | void | |
2106 | vchiq_platform_check_suspend(VCHIQ_STATE_T *state) | |
2107 | { | |
2108 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2109 | int susp = 0; | |
2110 | ||
2111 | if (!arm_state) | |
2112 | goto out; | |
2113 | ||
2114 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2115 | ||
2116 | write_lock_bh(&arm_state->susp_res_lock); | |
2117 | if (arm_state->vc_suspend_state == VC_SUSPEND_REQUESTED && | |
2118 | arm_state->vc_resume_state == VC_RESUME_RESUMED) { | |
2119 | set_suspend_state(arm_state, VC_SUSPEND_IN_PROGRESS); | |
2120 | susp = 1; | |
2121 | } | |
2122 | write_unlock_bh(&arm_state->susp_res_lock); | |
2123 | ||
2124 | if (susp) | |
2125 | vchiq_platform_suspend(state); | |
2126 | ||
2127 | out: | |
2128 | vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__); | |
2129 | return; | |
2130 | } | |
2131 | ||
2132 | ||
2133 | static void | |
2134 | output_timeout_error(VCHIQ_STATE_T *state) | |
2135 | { | |
2136 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
6d5f49a9 | 2137 | char err[50] = ""; |
71bad7f0 | 2138 | int vc_use_count = arm_state->videocore_use_count; |
2139 | int active_services = state->unused_service; | |
2140 | int i; | |
2141 | ||
2142 | if (!arm_state->videocore_use_count) { | |
6d5f49a9 | 2143 | snprintf(err, sizeof(err), " Videocore usecount is 0"); |
71bad7f0 | 2144 | goto output_msg; |
2145 | } | |
2146 | for (i = 0; i < active_services; i++) { | |
2147 | VCHIQ_SERVICE_T *service_ptr = state->services[i]; | |
2148 | if (service_ptr && service_ptr->service_use_count && | |
2149 | (service_ptr->srvstate != VCHIQ_SRVSTATE_FREE)) { | |
6d5f49a9 | 2150 | snprintf(err, sizeof(err), " %c%c%c%c(%d) service has " |
71bad7f0 | 2151 | "use count %d%s", VCHIQ_FOURCC_AS_4CHARS( |
2152 | service_ptr->base.fourcc), | |
2153 | service_ptr->client_id, | |
2154 | service_ptr->service_use_count, | |
2155 | service_ptr->service_use_count == | |
2156 | vc_use_count ? "" : " (+ more)"); | |
2157 | break; | |
2158 | } | |
2159 | } | |
2160 | ||
2161 | output_msg: | |
2162 | vchiq_log_error(vchiq_susp_log_level, | |
2163 | "timed out waiting for vc suspend (%d).%s", | |
6d5f49a9 | 2164 | arm_state->autosuspend_override, err); |
71bad7f0 | 2165 | |
2166 | } | |
2167 | ||
2168 | /* Try to get videocore into suspended state, regardless of autosuspend state. | |
2169 | ** We don't actually force suspend, since videocore may get into a bad state | |
2170 | ** if we force suspend at a bad time. Instead, we wait for autosuspend to | |
2171 | ** determine a good point to suspend. If this doesn't happen within 100ms we | |
2172 | ** report failure. | |
2173 | ** | |
2174 | ** Returns VCHIQ_SUCCESS if videocore suspended successfully, VCHIQ_RETRY if | |
2175 | ** videocore failed to suspend in time or VCHIQ_ERROR if interrupted. | |
2176 | */ | |
2177 | VCHIQ_STATUS_T | |
2178 | vchiq_arm_force_suspend(VCHIQ_STATE_T *state) | |
2179 | { | |
2180 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2181 | VCHIQ_STATUS_T status = VCHIQ_ERROR; | |
2182 | long rc = 0; | |
2183 | int repeat = -1; | |
2184 | ||
2185 | if (!arm_state) | |
2186 | goto out; | |
2187 | ||
2188 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2189 | ||
2190 | write_lock_bh(&arm_state->susp_res_lock); | |
2191 | ||
2192 | status = block_resume(arm_state); | |
2193 | if (status != VCHIQ_SUCCESS) | |
2194 | goto unlock; | |
2195 | if (arm_state->vc_suspend_state == VC_SUSPEND_SUSPENDED) { | |
2196 | /* Already suspended - just block resume and exit */ | |
2197 | vchiq_log_info(vchiq_susp_log_level, "%s already suspended", | |
2198 | __func__); | |
2199 | status = VCHIQ_SUCCESS; | |
2200 | goto unlock; | |
2201 | } else if (arm_state->vc_suspend_state <= VC_SUSPEND_IDLE) { | |
2202 | /* initiate suspend immediately in the case that we're waiting | |
2203 | * for the timeout */ | |
2204 | stop_suspend_timer(arm_state); | |
2205 | if (!vchiq_videocore_wanted(state)) { | |
2206 | vchiq_log_info(vchiq_susp_log_level, "%s videocore " | |
2207 | "idle, initiating suspend", __func__); | |
2208 | status = vchiq_arm_vcsuspend(state); | |
2209 | } else if (arm_state->autosuspend_override < | |
2210 | FORCE_SUSPEND_FAIL_MAX) { | |
2211 | vchiq_log_info(vchiq_susp_log_level, "%s letting " | |
2212 | "videocore go idle", __func__); | |
2213 | status = VCHIQ_SUCCESS; | |
2214 | } else { | |
2215 | vchiq_log_warning(vchiq_susp_log_level, "%s failed too " | |
2216 | "many times - attempting suspend", __func__); | |
2217 | status = vchiq_arm_vcsuspend(state); | |
2218 | } | |
2219 | } else { | |
2220 | vchiq_log_info(vchiq_susp_log_level, "%s videocore suspend " | |
2221 | "in progress - wait for completion", __func__); | |
2222 | status = VCHIQ_SUCCESS; | |
2223 | } | |
2224 | ||
2225 | /* Wait for suspend to happen due to system idle (not forced..) */ | |
2226 | if (status != VCHIQ_SUCCESS) | |
2227 | goto unblock_resume; | |
2228 | ||
2229 | do { | |
2230 | write_unlock_bh(&arm_state->susp_res_lock); | |
2231 | ||
2232 | rc = wait_for_completion_interruptible_timeout( | |
2233 | &arm_state->vc_suspend_complete, | |
2234 | msecs_to_jiffies(FORCE_SUSPEND_TIMEOUT_MS)); | |
2235 | ||
2236 | write_lock_bh(&arm_state->susp_res_lock); | |
2237 | if (rc < 0) { | |
2238 | vchiq_log_warning(vchiq_susp_log_level, "%s " | |
2239 | "interrupted waiting for suspend", __func__); | |
2240 | status = VCHIQ_ERROR; | |
2241 | goto unblock_resume; | |
2242 | } else if (rc == 0) { | |
2243 | if (arm_state->vc_suspend_state > VC_SUSPEND_IDLE) { | |
2244 | /* Repeat timeout once if in progress */ | |
2245 | if (repeat < 0) { | |
2246 | repeat = 1; | |
2247 | continue; | |
2248 | } | |
2249 | } | |
2250 | arm_state->autosuspend_override++; | |
2251 | output_timeout_error(state); | |
2252 | ||
2253 | status = VCHIQ_RETRY; | |
2254 | goto unblock_resume; | |
2255 | } | |
2256 | } while (0 < (repeat--)); | |
2257 | ||
2258 | /* Check and report state in case we need to abort ARM suspend */ | |
2259 | if (arm_state->vc_suspend_state != VC_SUSPEND_SUSPENDED) { | |
2260 | status = VCHIQ_RETRY; | |
2261 | vchiq_log_error(vchiq_susp_log_level, | |
2262 | "%s videocore suspend failed (state %s)", __func__, | |
2263 | suspend_state_names[arm_state->vc_suspend_state + | |
2264 | VC_SUSPEND_NUM_OFFSET]); | |
2265 | /* Reset the state only if it's still in an error state. | |
2266 | * Something could have already initiated another suspend. */ | |
2267 | if (arm_state->vc_suspend_state < VC_SUSPEND_IDLE) | |
2268 | set_suspend_state(arm_state, VC_SUSPEND_IDLE); | |
2269 | ||
2270 | goto unblock_resume; | |
2271 | } | |
2272 | ||
2273 | /* successfully suspended - unlock and exit */ | |
2274 | goto unlock; | |
2275 | ||
2276 | unblock_resume: | |
2277 | /* all error states need to unblock resume before exit */ | |
2278 | unblock_resume(arm_state); | |
2279 | ||
2280 | unlock: | |
2281 | write_unlock_bh(&arm_state->susp_res_lock); | |
2282 | ||
2283 | out: | |
2284 | vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, status); | |
2285 | return status; | |
2286 | } | |
2287 | ||
2288 | void | |
2289 | vchiq_check_suspend(VCHIQ_STATE_T *state) | |
2290 | { | |
2291 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2292 | ||
2293 | if (!arm_state) | |
2294 | goto out; | |
2295 | ||
2296 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2297 | ||
2298 | write_lock_bh(&arm_state->susp_res_lock); | |
2299 | if (arm_state->vc_suspend_state != VC_SUSPEND_SUSPENDED && | |
2300 | arm_state->first_connect && | |
2301 | !vchiq_videocore_wanted(state)) { | |
2302 | vchiq_arm_vcsuspend(state); | |
2303 | } | |
2304 | write_unlock_bh(&arm_state->susp_res_lock); | |
2305 | ||
2306 | out: | |
2307 | vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__); | |
2308 | return; | |
2309 | } | |
2310 | ||
2311 | ||
2312 | int | |
2313 | vchiq_arm_allow_resume(VCHIQ_STATE_T *state) | |
2314 | { | |
2315 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2316 | int resume = 0; | |
2317 | int ret = -1; | |
2318 | ||
2319 | if (!arm_state) | |
2320 | goto out; | |
2321 | ||
2322 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2323 | ||
2324 | write_lock_bh(&arm_state->susp_res_lock); | |
2325 | unblock_resume(arm_state); | |
2326 | resume = vchiq_check_resume(state); | |
2327 | write_unlock_bh(&arm_state->susp_res_lock); | |
2328 | ||
2329 | if (resume) { | |
2330 | if (wait_for_completion_interruptible( | |
2331 | &arm_state->vc_resume_complete) < 0) { | |
2332 | vchiq_log_error(vchiq_susp_log_level, | |
2333 | "%s interrupted", __func__); | |
2334 | /* failed, cannot accurately derive suspend | |
2335 | * state, so exit early. */ | |
2336 | goto out; | |
2337 | } | |
2338 | } | |
2339 | ||
2340 | read_lock_bh(&arm_state->susp_res_lock); | |
2341 | if (arm_state->vc_suspend_state == VC_SUSPEND_SUSPENDED) { | |
2342 | vchiq_log_info(vchiq_susp_log_level, | |
2343 | "%s: Videocore remains suspended", __func__); | |
2344 | } else { | |
2345 | vchiq_log_info(vchiq_susp_log_level, | |
2346 | "%s: Videocore resumed", __func__); | |
2347 | ret = 0; | |
2348 | } | |
2349 | read_unlock_bh(&arm_state->susp_res_lock); | |
2350 | out: | |
2351 | vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret); | |
2352 | return ret; | |
2353 | } | |
2354 | ||
2355 | /* This function should be called with the write lock held */ | |
2356 | int | |
2357 | vchiq_check_resume(VCHIQ_STATE_T *state) | |
2358 | { | |
2359 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2360 | int resume = 0; | |
2361 | ||
2362 | if (!arm_state) | |
2363 | goto out; | |
2364 | ||
2365 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2366 | ||
2367 | if (need_resume(state)) { | |
2368 | set_resume_state(arm_state, VC_RESUME_REQUESTED); | |
2369 | request_poll(state, NULL, 0); | |
2370 | resume = 1; | |
2371 | } | |
2372 | ||
2373 | out: | |
2374 | vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__); | |
2375 | return resume; | |
2376 | } | |
2377 | ||
2378 | void | |
2379 | vchiq_platform_check_resume(VCHIQ_STATE_T *state) | |
2380 | { | |
2381 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2382 | int res = 0; | |
2383 | ||
2384 | if (!arm_state) | |
2385 | goto out; | |
2386 | ||
2387 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2388 | ||
2389 | write_lock_bh(&arm_state->susp_res_lock); | |
2390 | if (arm_state->wake_address == 0) { | |
2391 | vchiq_log_info(vchiq_susp_log_level, | |
2392 | "%s: already awake", __func__); | |
2393 | goto unlock; | |
2394 | } | |
2395 | if (arm_state->vc_resume_state == VC_RESUME_IN_PROGRESS) { | |
2396 | vchiq_log_info(vchiq_susp_log_level, | |
2397 | "%s: already resuming", __func__); | |
2398 | goto unlock; | |
2399 | } | |
2400 | ||
2401 | if (arm_state->vc_resume_state == VC_RESUME_REQUESTED) { | |
2402 | set_resume_state(arm_state, VC_RESUME_IN_PROGRESS); | |
2403 | res = 1; | |
2404 | } else | |
2405 | vchiq_log_trace(vchiq_susp_log_level, | |
2406 | "%s: not resuming (resume state %s)", __func__, | |
2407 | resume_state_names[arm_state->vc_resume_state + | |
2408 | VC_RESUME_NUM_OFFSET]); | |
2409 | ||
2410 | unlock: | |
2411 | write_unlock_bh(&arm_state->susp_res_lock); | |
2412 | ||
2413 | if (res) | |
2414 | vchiq_platform_resume(state); | |
2415 | ||
2416 | out: | |
2417 | vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__); | |
2418 | return; | |
2419 | ||
2420 | } | |
2421 | ||
2422 | ||
2423 | ||
2424 | VCHIQ_STATUS_T | |
2425 | vchiq_use_internal(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service, | |
2426 | enum USE_TYPE_E use_type) | |
2427 | { | |
2428 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2429 | VCHIQ_STATUS_T ret = VCHIQ_SUCCESS; | |
2430 | char entity[16]; | |
2431 | int *entity_uc; | |
2432 | int local_uc, local_entity_uc; | |
2433 | ||
2434 | if (!arm_state) | |
2435 | goto out; | |
2436 | ||
2437 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2438 | ||
2439 | if (use_type == USE_TYPE_VCHIQ) { | |
2440 | sprintf(entity, "VCHIQ: "); | |
2441 | entity_uc = &arm_state->peer_use_count; | |
2442 | } else if (service) { | |
2443 | sprintf(entity, "%c%c%c%c:%03d", | |
2444 | VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc), | |
2445 | service->client_id); | |
2446 | entity_uc = &service->service_use_count; | |
2447 | } else { | |
2448 | vchiq_log_error(vchiq_susp_log_level, "%s null service " | |
2449 | "ptr", __func__); | |
2450 | ret = VCHIQ_ERROR; | |
2451 | goto out; | |
2452 | } | |
2453 | ||
2454 | write_lock_bh(&arm_state->susp_res_lock); | |
2455 | while (arm_state->resume_blocked) { | |
2456 | /* If we call 'use' while force suspend is waiting for suspend, | |
2457 | * then we're about to block the thread which the force is | |
2458 | * waiting to complete, so we're bound to just time out. In this | |
2459 | * case, set the suspend state such that the wait will be | |
2460 | * canceled, so we can complete as quickly as possible. */ | |
2461 | if (arm_state->resume_blocked && arm_state->vc_suspend_state == | |
2462 | VC_SUSPEND_IDLE) { | |
2463 | set_suspend_state(arm_state, VC_SUSPEND_FORCE_CANCELED); | |
2464 | break; | |
2465 | } | |
2466 | /* If suspend is already in progress then we need to block */ | |
2467 | if (!try_wait_for_completion(&arm_state->resume_blocker)) { | |
2468 | /* Indicate that there are threads waiting on the resume | |
2469 | * blocker. These need to be allowed to complete before | |
2470 | * a _second_ call to force suspend can complete, | |
2471 | * otherwise low priority threads might never actually | |
2472 | * continue */ | |
2473 | arm_state->blocked_count++; | |
2474 | write_unlock_bh(&arm_state->susp_res_lock); | |
2475 | vchiq_log_info(vchiq_susp_log_level, "%s %s resume " | |
2476 | "blocked - waiting...", __func__, entity); | |
2477 | if (wait_for_completion_killable( | |
2478 | &arm_state->resume_blocker) != 0) { | |
2479 | vchiq_log_error(vchiq_susp_log_level, "%s %s " | |
2480 | "wait for resume blocker interrupted", | |
2481 | __func__, entity); | |
2482 | ret = VCHIQ_ERROR; | |
2483 | write_lock_bh(&arm_state->susp_res_lock); | |
2484 | arm_state->blocked_count--; | |
2485 | write_unlock_bh(&arm_state->susp_res_lock); | |
2486 | goto out; | |
2487 | } | |
2488 | vchiq_log_info(vchiq_susp_log_level, "%s %s resume " | |
2489 | "unblocked", __func__, entity); | |
2490 | write_lock_bh(&arm_state->susp_res_lock); | |
2491 | if (--arm_state->blocked_count == 0) | |
2492 | complete_all(&arm_state->blocked_blocker); | |
2493 | } | |
2494 | } | |
2495 | ||
2496 | stop_suspend_timer(arm_state); | |
2497 | ||
2498 | local_uc = ++arm_state->videocore_use_count; | |
2499 | local_entity_uc = ++(*entity_uc); | |
2500 | ||
2501 | /* If there's a pending request which hasn't yet been serviced then | |
2502 | * just clear it. If we're past VC_SUSPEND_REQUESTED state then | |
2503 | * vc_resume_complete will block until we either resume or fail to | |
2504 | * suspend */ | |
2505 | if (arm_state->vc_suspend_state <= VC_SUSPEND_REQUESTED) | |
2506 | set_suspend_state(arm_state, VC_SUSPEND_IDLE); | |
2507 | ||
2508 | if ((use_type != USE_TYPE_SERVICE_NO_RESUME) && need_resume(state)) { | |
2509 | set_resume_state(arm_state, VC_RESUME_REQUESTED); | |
2510 | vchiq_log_info(vchiq_susp_log_level, | |
2511 | "%s %s count %d, state count %d", | |
2512 | __func__, entity, local_entity_uc, local_uc); | |
2513 | request_poll(state, NULL, 0); | |
2514 | } else | |
2515 | vchiq_log_trace(vchiq_susp_log_level, | |
2516 | "%s %s count %d, state count %d", | |
2517 | __func__, entity, *entity_uc, local_uc); | |
2518 | ||
2519 | ||
2520 | write_unlock_bh(&arm_state->susp_res_lock); | |
2521 | ||
2522 | /* Completion is in a done state when we're not suspended, so this won't | |
2523 | * block for the non-suspended case. */ | |
2524 | if (!try_wait_for_completion(&arm_state->vc_resume_complete)) { | |
2525 | vchiq_log_info(vchiq_susp_log_level, "%s %s wait for resume", | |
2526 | __func__, entity); | |
2527 | if (wait_for_completion_killable( | |
2528 | &arm_state->vc_resume_complete) != 0) { | |
2529 | vchiq_log_error(vchiq_susp_log_level, "%s %s wait for " | |
2530 | "resume interrupted", __func__, entity); | |
2531 | ret = VCHIQ_ERROR; | |
2532 | goto out; | |
2533 | } | |
2534 | vchiq_log_info(vchiq_susp_log_level, "%s %s resumed", __func__, | |
2535 | entity); | |
2536 | } | |
2537 | ||
2538 | if (ret == VCHIQ_SUCCESS) { | |
2539 | VCHIQ_STATUS_T status = VCHIQ_SUCCESS; | |
2540 | long ack_cnt = atomic_xchg(&arm_state->ka_use_ack_count, 0); | |
2541 | while (ack_cnt && (status == VCHIQ_SUCCESS)) { | |
2542 | /* Send the use notify to videocore */ | |
2543 | status = vchiq_send_remote_use_active(state); | |
2544 | if (status == VCHIQ_SUCCESS) | |
2545 | ack_cnt--; | |
2546 | else | |
2547 | atomic_add(ack_cnt, | |
2548 | &arm_state->ka_use_ack_count); | |
2549 | } | |
2550 | } | |
2551 | ||
2552 | out: | |
2553 | vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret); | |
2554 | return ret; | |
2555 | } | |
2556 | ||
2557 | VCHIQ_STATUS_T | |
2558 | vchiq_release_internal(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service) | |
2559 | { | |
2560 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2561 | VCHIQ_STATUS_T ret = VCHIQ_SUCCESS; | |
2562 | char entity[16]; | |
2563 | int *entity_uc; | |
2564 | int local_uc, local_entity_uc; | |
2565 | ||
2566 | if (!arm_state) | |
2567 | goto out; | |
2568 | ||
2569 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2570 | ||
2571 | if (service) { | |
2572 | sprintf(entity, "%c%c%c%c:%03d", | |
2573 | VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc), | |
2574 | service->client_id); | |
2575 | entity_uc = &service->service_use_count; | |
2576 | } else { | |
2577 | sprintf(entity, "PEER: "); | |
2578 | entity_uc = &arm_state->peer_use_count; | |
2579 | } | |
2580 | ||
2581 | write_lock_bh(&arm_state->susp_res_lock); | |
2582 | if (!arm_state->videocore_use_count || !(*entity_uc)) { | |
2583 | /* Don't use BUG_ON - don't allow user thread to crash kernel */ | |
2584 | WARN_ON(!arm_state->videocore_use_count); | |
2585 | WARN_ON(!(*entity_uc)); | |
2586 | ret = VCHIQ_ERROR; | |
2587 | goto unlock; | |
2588 | } | |
2589 | local_uc = --arm_state->videocore_use_count; | |
2590 | local_entity_uc = --(*entity_uc); | |
2591 | ||
2592 | if (!vchiq_videocore_wanted(state)) { | |
2593 | if (vchiq_platform_use_suspend_timer() && | |
2594 | !arm_state->resume_blocked) { | |
2595 | /* Only use the timer if we're not trying to force | |
2596 | * suspend (=> resume_blocked) */ | |
2597 | start_suspend_timer(arm_state); | |
2598 | } else { | |
2599 | vchiq_log_info(vchiq_susp_log_level, | |
2600 | "%s %s count %d, state count %d - suspending", | |
2601 | __func__, entity, *entity_uc, | |
2602 | arm_state->videocore_use_count); | |
2603 | vchiq_arm_vcsuspend(state); | |
2604 | } | |
2605 | } else | |
2606 | vchiq_log_trace(vchiq_susp_log_level, | |
2607 | "%s %s count %d, state count %d", | |
2608 | __func__, entity, *entity_uc, | |
2609 | arm_state->videocore_use_count); | |
2610 | ||
2611 | unlock: | |
2612 | write_unlock_bh(&arm_state->susp_res_lock); | |
2613 | ||
2614 | out: | |
2615 | vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret); | |
2616 | return ret; | |
2617 | } | |
2618 | ||
2619 | void | |
2620 | vchiq_on_remote_use(VCHIQ_STATE_T *state) | |
2621 | { | |
2622 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2623 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2624 | atomic_inc(&arm_state->ka_use_count); | |
2625 | complete(&arm_state->ka_evt); | |
2626 | } | |
2627 | ||
2628 | void | |
2629 | vchiq_on_remote_release(VCHIQ_STATE_T *state) | |
2630 | { | |
2631 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2632 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2633 | atomic_inc(&arm_state->ka_release_count); | |
2634 | complete(&arm_state->ka_evt); | |
2635 | } | |
2636 | ||
2637 | VCHIQ_STATUS_T | |
2638 | vchiq_use_service_internal(VCHIQ_SERVICE_T *service) | |
2639 | { | |
2640 | return vchiq_use_internal(service->state, service, USE_TYPE_SERVICE); | |
2641 | } | |
2642 | ||
2643 | VCHIQ_STATUS_T | |
2644 | vchiq_release_service_internal(VCHIQ_SERVICE_T *service) | |
2645 | { | |
2646 | return vchiq_release_internal(service->state, service); | |
2647 | } | |
2648 | ||
2649 | VCHIQ_DEBUGFS_NODE_T * | |
2650 | vchiq_instance_get_debugfs_node(VCHIQ_INSTANCE_T instance) | |
2651 | { | |
2652 | return &instance->debugfs_node; | |
2653 | } | |
2654 | ||
2655 | int | |
2656 | vchiq_instance_get_use_count(VCHIQ_INSTANCE_T instance) | |
2657 | { | |
2658 | VCHIQ_SERVICE_T *service; | |
2659 | int use_count = 0, i; | |
2660 | i = 0; | |
2661 | while ((service = next_service_by_instance(instance->state, | |
2662 | instance, &i)) != NULL) { | |
2663 | use_count += service->service_use_count; | |
2664 | unlock_service(service); | |
2665 | } | |
2666 | return use_count; | |
2667 | } | |
2668 | ||
2669 | int | |
2670 | vchiq_instance_get_pid(VCHIQ_INSTANCE_T instance) | |
2671 | { | |
2672 | return instance->pid; | |
2673 | } | |
2674 | ||
2675 | int | |
2676 | vchiq_instance_get_trace(VCHIQ_INSTANCE_T instance) | |
2677 | { | |
2678 | return instance->trace; | |
2679 | } | |
2680 | ||
2681 | void | |
2682 | vchiq_instance_set_trace(VCHIQ_INSTANCE_T instance, int trace) | |
2683 | { | |
2684 | VCHIQ_SERVICE_T *service; | |
2685 | int i; | |
2686 | i = 0; | |
2687 | while ((service = next_service_by_instance(instance->state, | |
2688 | instance, &i)) != NULL) { | |
2689 | service->trace = trace; | |
2690 | unlock_service(service); | |
2691 | } | |
2692 | instance->trace = (trace != 0); | |
2693 | } | |
2694 | ||
2695 | static void suspend_timer_callback(unsigned long context) | |
2696 | { | |
2697 | VCHIQ_STATE_T *state = (VCHIQ_STATE_T *)context; | |
2698 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2699 | if (!arm_state) | |
2700 | goto out; | |
2701 | vchiq_log_info(vchiq_susp_log_level, | |
2702 | "%s - suspend timer expired - check suspend", __func__); | |
2703 | vchiq_check_suspend(state); | |
2704 | out: | |
2705 | return; | |
2706 | } | |
2707 | ||
2708 | VCHIQ_STATUS_T | |
2709 | vchiq_use_service_no_resume(VCHIQ_SERVICE_HANDLE_T handle) | |
2710 | { | |
2711 | VCHIQ_STATUS_T ret = VCHIQ_ERROR; | |
2712 | VCHIQ_SERVICE_T *service = find_service_by_handle(handle); | |
2713 | if (service) { | |
2714 | ret = vchiq_use_internal(service->state, service, | |
2715 | USE_TYPE_SERVICE_NO_RESUME); | |
2716 | unlock_service(service); | |
2717 | } | |
2718 | return ret; | |
2719 | } | |
2720 | ||
2721 | VCHIQ_STATUS_T | |
2722 | vchiq_use_service(VCHIQ_SERVICE_HANDLE_T handle) | |
2723 | { | |
2724 | VCHIQ_STATUS_T ret = VCHIQ_ERROR; | |
2725 | VCHIQ_SERVICE_T *service = find_service_by_handle(handle); | |
2726 | if (service) { | |
2727 | ret = vchiq_use_internal(service->state, service, | |
2728 | USE_TYPE_SERVICE); | |
2729 | unlock_service(service); | |
2730 | } | |
2731 | return ret; | |
2732 | } | |
2733 | ||
2734 | VCHIQ_STATUS_T | |
2735 | vchiq_release_service(VCHIQ_SERVICE_HANDLE_T handle) | |
2736 | { | |
2737 | VCHIQ_STATUS_T ret = VCHIQ_ERROR; | |
2738 | VCHIQ_SERVICE_T *service = find_service_by_handle(handle); | |
2739 | if (service) { | |
2740 | ret = vchiq_release_internal(service->state, service); | |
2741 | unlock_service(service); | |
2742 | } | |
2743 | return ret; | |
2744 | } | |
2745 | ||
2746 | void | |
2747 | vchiq_dump_service_use_state(VCHIQ_STATE_T *state) | |
2748 | { | |
2749 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2750 | int i, j = 0; | |
2751 | /* Only dump 64 services */ | |
2752 | static const int local_max_services = 64; | |
2753 | /* If there's more than 64 services, only dump ones with | |
2754 | * non-zero counts */ | |
2755 | int only_nonzero = 0; | |
2756 | static const char *nz = "<-- preventing suspend"; | |
2757 | ||
2758 | enum vc_suspend_status vc_suspend_state; | |
2759 | enum vc_resume_status vc_resume_state; | |
2760 | int peer_count; | |
2761 | int vc_use_count; | |
2762 | int active_services; | |
2763 | struct service_data_struct { | |
2764 | int fourcc; | |
2765 | int clientid; | |
2766 | int use_count; | |
2767 | } service_data[local_max_services]; | |
2768 | ||
2769 | if (!arm_state) | |
2770 | return; | |
2771 | ||
2772 | read_lock_bh(&arm_state->susp_res_lock); | |
2773 | vc_suspend_state = arm_state->vc_suspend_state; | |
2774 | vc_resume_state = arm_state->vc_resume_state; | |
2775 | peer_count = arm_state->peer_use_count; | |
2776 | vc_use_count = arm_state->videocore_use_count; | |
2777 | active_services = state->unused_service; | |
2778 | if (active_services > local_max_services) | |
2779 | only_nonzero = 1; | |
2780 | ||
2781 | for (i = 0; (i < active_services) && (j < local_max_services); i++) { | |
2782 | VCHIQ_SERVICE_T *service_ptr = state->services[i]; | |
2783 | if (!service_ptr) | |
2784 | continue; | |
2785 | ||
2786 | if (only_nonzero && !service_ptr->service_use_count) | |
2787 | continue; | |
2788 | ||
2789 | if (service_ptr->srvstate != VCHIQ_SRVSTATE_FREE) { | |
2790 | service_data[j].fourcc = service_ptr->base.fourcc; | |
2791 | service_data[j].clientid = service_ptr->client_id; | |
2792 | service_data[j++].use_count = service_ptr-> | |
2793 | service_use_count; | |
2794 | } | |
2795 | } | |
2796 | ||
2797 | read_unlock_bh(&arm_state->susp_res_lock); | |
2798 | ||
2799 | vchiq_log_warning(vchiq_susp_log_level, | |
2800 | "-- Videcore suspend state: %s --", | |
2801 | suspend_state_names[vc_suspend_state + VC_SUSPEND_NUM_OFFSET]); | |
2802 | vchiq_log_warning(vchiq_susp_log_level, | |
2803 | "-- Videcore resume state: %s --", | |
2804 | resume_state_names[vc_resume_state + VC_RESUME_NUM_OFFSET]); | |
2805 | ||
2806 | if (only_nonzero) | |
2807 | vchiq_log_warning(vchiq_susp_log_level, "Too many active " | |
2808 | "services (%d). Only dumping up to first %d services " | |
2809 | "with non-zero use-count", active_services, | |
2810 | local_max_services); | |
2811 | ||
2812 | for (i = 0; i < j; i++) { | |
2813 | vchiq_log_warning(vchiq_susp_log_level, | |
2814 | "----- %c%c%c%c:%d service count %d %s", | |
2815 | VCHIQ_FOURCC_AS_4CHARS(service_data[i].fourcc), | |
2816 | service_data[i].clientid, | |
2817 | service_data[i].use_count, | |
2818 | service_data[i].use_count ? nz : ""); | |
2819 | } | |
2820 | vchiq_log_warning(vchiq_susp_log_level, | |
2821 | "----- VCHIQ use count count %d", peer_count); | |
2822 | vchiq_log_warning(vchiq_susp_log_level, | |
2823 | "--- Overall vchiq instance use count %d", vc_use_count); | |
2824 | ||
2825 | vchiq_dump_platform_use_state(state); | |
2826 | } | |
2827 | ||
2828 | VCHIQ_STATUS_T | |
2829 | vchiq_check_service(VCHIQ_SERVICE_T *service) | |
2830 | { | |
2831 | VCHIQ_ARM_STATE_T *arm_state; | |
2832 | VCHIQ_STATUS_T ret = VCHIQ_ERROR; | |
2833 | ||
2834 | if (!service || !service->state) | |
2835 | goto out; | |
2836 | ||
2837 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2838 | ||
2839 | arm_state = vchiq_platform_get_arm_state(service->state); | |
2840 | ||
2841 | read_lock_bh(&arm_state->susp_res_lock); | |
2842 | if (service->service_use_count) | |
2843 | ret = VCHIQ_SUCCESS; | |
2844 | read_unlock_bh(&arm_state->susp_res_lock); | |
2845 | ||
2846 | if (ret == VCHIQ_ERROR) { | |
2847 | vchiq_log_error(vchiq_susp_log_level, | |
2848 | "%s ERROR - %c%c%c%c:%d service count %d, " | |
2849 | "state count %d, videocore suspend state %s", __func__, | |
2850 | VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc), | |
2851 | service->client_id, service->service_use_count, | |
2852 | arm_state->videocore_use_count, | |
2853 | suspend_state_names[arm_state->vc_suspend_state + | |
2854 | VC_SUSPEND_NUM_OFFSET]); | |
2855 | vchiq_dump_service_use_state(service->state); | |
2856 | } | |
2857 | out: | |
2858 | return ret; | |
2859 | } | |
2860 | ||
2861 | /* stub functions */ | |
2862 | void vchiq_on_remote_use_active(VCHIQ_STATE_T *state) | |
2863 | { | |
2864 | (void)state; | |
2865 | } | |
2866 | ||
2867 | void vchiq_platform_conn_state_changed(VCHIQ_STATE_T *state, | |
2868 | VCHIQ_CONNSTATE_T oldstate, VCHIQ_CONNSTATE_T newstate) | |
2869 | { | |
2870 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2871 | vchiq_log_info(vchiq_susp_log_level, "%d: %s->%s", state->id, | |
2872 | get_conn_state_name(oldstate), get_conn_state_name(newstate)); | |
2873 | if (state->conn_state == VCHIQ_CONNSTATE_CONNECTED) { | |
2874 | write_lock_bh(&arm_state->susp_res_lock); | |
2875 | if (!arm_state->first_connect) { | |
2876 | char threadname[10]; | |
2877 | arm_state->first_connect = 1; | |
2878 | write_unlock_bh(&arm_state->susp_res_lock); | |
2879 | snprintf(threadname, sizeof(threadname), "VCHIQka-%d", | |
2880 | state->id); | |
2881 | arm_state->ka_thread = kthread_create( | |
2882 | &vchiq_keepalive_thread_func, | |
2883 | (void *)state, | |
2884 | threadname); | |
b04451d7 | 2885 | if (IS_ERR(arm_state->ka_thread)) { |
71bad7f0 | 2886 | vchiq_log_error(vchiq_susp_log_level, |
2887 | "vchiq: FATAL: couldn't create thread %s", | |
2888 | threadname); | |
2889 | } else { | |
2890 | wake_up_process(arm_state->ka_thread); | |
2891 | } | |
2892 | } else | |
2893 | write_unlock_bh(&arm_state->susp_res_lock); | |
2894 | } | |
2895 | } | |
2896 | ||
2897 | static int vchiq_probe(struct platform_device *pdev) | |
2898 | { | |
2899 | struct device_node *fw_node; | |
2900 | struct rpi_firmware *fw; | |
2901 | int err; | |
2902 | void *ptr_err; | |
2903 | ||
2904 | fw_node = of_parse_phandle(pdev->dev.of_node, "firmware", 0); | |
71bad7f0 | 2905 | if (!fw_node) { |
2906 | dev_err(&pdev->dev, "Missing firmware node\n"); | |
2907 | return -ENOENT; | |
2908 | } | |
bea845af | 2909 | |
71bad7f0 | 2910 | fw = rpi_firmware_get(fw_node); |
d10543ec | 2911 | of_node_put(fw_node); |
71bad7f0 | 2912 | if (!fw) |
2913 | return -EPROBE_DEFER; | |
2914 | ||
2915 | platform_set_drvdata(pdev, fw); | |
2916 | ||
9224c15c | 2917 | err = vchiq_platform_init(pdev, &g_state); |
71bad7f0 | 2918 | if (err != 0) |
9224c15c | 2919 | goto failed_platform_init; |
71bad7f0 | 2920 | |
2921 | err = alloc_chrdev_region(&vchiq_devid, VCHIQ_MINOR, 1, DEVICE_NAME); | |
2922 | if (err != 0) { | |
2923 | vchiq_log_error(vchiq_arm_log_level, | |
2924 | "Unable to allocate device number"); | |
9224c15c | 2925 | goto failed_platform_init; |
71bad7f0 | 2926 | } |
2927 | cdev_init(&vchiq_cdev, &vchiq_fops); | |
2928 | vchiq_cdev.owner = THIS_MODULE; | |
2929 | err = cdev_add(&vchiq_cdev, vchiq_devid, 1); | |
2930 | if (err != 0) { | |
2931 | vchiq_log_error(vchiq_arm_log_level, | |
2932 | "Unable to register device"); | |
2933 | goto failed_cdev_add; | |
2934 | } | |
2935 | ||
2936 | /* create sysfs entries */ | |
2937 | vchiq_class = class_create(THIS_MODULE, DEVICE_NAME); | |
2938 | ptr_err = vchiq_class; | |
2939 | if (IS_ERR(ptr_err)) | |
2940 | goto failed_class_create; | |
2941 | ||
2942 | vchiq_dev = device_create(vchiq_class, NULL, | |
2943 | vchiq_devid, NULL, "vchiq"); | |
2944 | ptr_err = vchiq_dev; | |
2945 | if (IS_ERR(ptr_err)) | |
2946 | goto failed_device_create; | |
2947 | ||
9224c15c SW |
2948 | /* create debugfs entries */ |
2949 | err = vchiq_debugfs_init(); | |
71bad7f0 | 2950 | if (err != 0) |
9224c15c | 2951 | goto failed_debugfs_init; |
71bad7f0 | 2952 | |
2953 | vchiq_log_info(vchiq_arm_log_level, | |
2954 | "vchiq: initialised - version %d (min %d), device %d.%d", | |
2955 | VCHIQ_VERSION, VCHIQ_VERSION_MIN, | |
2956 | MAJOR(vchiq_devid), MINOR(vchiq_devid)); | |
2957 | ||
2958 | return 0; | |
2959 | ||
9224c15c | 2960 | failed_debugfs_init: |
71bad7f0 | 2961 | device_destroy(vchiq_class, vchiq_devid); |
2962 | failed_device_create: | |
2963 | class_destroy(vchiq_class); | |
2964 | failed_class_create: | |
2965 | cdev_del(&vchiq_cdev); | |
2966 | err = PTR_ERR(ptr_err); | |
2967 | failed_cdev_add: | |
2968 | unregister_chrdev_region(vchiq_devid, 1); | |
9224c15c | 2969 | failed_platform_init: |
71bad7f0 | 2970 | vchiq_log_warning(vchiq_arm_log_level, "could not load vchiq"); |
2971 | return err; | |
2972 | } | |
2973 | ||
2974 | static int vchiq_remove(struct platform_device *pdev) | |
2975 | { | |
0ece01c6 | 2976 | vchiq_debugfs_deinit(); |
71bad7f0 | 2977 | device_destroy(vchiq_class, vchiq_devid); |
2978 | class_destroy(vchiq_class); | |
2979 | cdev_del(&vchiq_cdev); | |
2980 | unregister_chrdev_region(vchiq_devid, 1); | |
2981 | ||
2982 | return 0; | |
2983 | } | |
2984 | ||
2985 | static const struct of_device_id vchiq_of_match[] = { | |
2986 | { .compatible = "brcm,bcm2835-vchiq", }, | |
2987 | {}, | |
2988 | }; | |
2989 | MODULE_DEVICE_TABLE(of, vchiq_of_match); | |
2990 | ||
2991 | static struct platform_driver vchiq_driver = { | |
2992 | .driver = { | |
2993 | .name = "bcm2835_vchiq", | |
71bad7f0 | 2994 | .of_match_table = vchiq_of_match, |
2995 | }, | |
2996 | .probe = vchiq_probe, | |
2997 | .remove = vchiq_remove, | |
2998 | }; | |
2999 | module_platform_driver(vchiq_driver); | |
3000 | ||
3001 | MODULE_LICENSE("GPL"); | |
8f8a3402 | 3002 | MODULE_DESCRIPTION("Videocore VCHIQ driver"); |
71bad7f0 | 3003 | MODULE_AUTHOR("Broadcom Corporation"); |