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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> | |
3f07c014 | 37 | #include <linux/sched/signal.h> |
71bad7f0 | 38 | #include <linux/types.h> |
39 | #include <linux/errno.h> | |
40 | #include <linux/cdev.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/device.h> | |
43 | #include <linux/mm.h> | |
44 | #include <linux/highmem.h> | |
45 | #include <linux/pagemap.h> | |
46 | #include <linux/bug.h> | |
47 | #include <linux/semaphore.h> | |
48 | #include <linux/list.h> | |
49 | #include <linux/of.h> | |
50 | #include <linux/platform_device.h> | |
5569a126 | 51 | #include <linux/compat.h> |
71bad7f0 | 52 | #include <soc/bcm2835/raspberrypi-firmware.h> |
53 | ||
54 | #include "vchiq_core.h" | |
55 | #include "vchiq_ioctl.h" | |
56 | #include "vchiq_arm.h" | |
57 | #include "vchiq_debugfs.h" | |
58 | #include "vchiq_killable.h" | |
59 | ||
60 | #define DEVICE_NAME "vchiq" | |
61 | ||
62 | /* Override the default prefix, which would be vchiq_arm (from the filename) */ | |
63 | #undef MODULE_PARAM_PREFIX | |
64 | #define MODULE_PARAM_PREFIX DEVICE_NAME "." | |
65 | ||
66 | #define VCHIQ_MINOR 0 | |
67 | ||
68 | /* Some per-instance constants */ | |
a2db578b | 69 | #define MAX_COMPLETIONS 128 |
71bad7f0 | 70 | #define MAX_SERVICES 64 |
71 | #define MAX_ELEMENTS 8 | |
a2db578b | 72 | #define MSG_QUEUE_SIZE 128 |
71bad7f0 | 73 | |
74 | #define KEEPALIVE_VER 1 | |
75 | #define KEEPALIVE_VER_MIN KEEPALIVE_VER | |
76 | ||
77 | /* Run time control of log level, based on KERN_XXX level. */ | |
78 | int vchiq_arm_log_level = VCHIQ_LOG_DEFAULT; | |
79 | int vchiq_susp_log_level = VCHIQ_LOG_ERROR; | |
80 | ||
81 | #define SUSPEND_TIMER_TIMEOUT_MS 100 | |
82 | #define SUSPEND_RETRY_TIMER_TIMEOUT_MS 1000 | |
83 | ||
84 | #define VC_SUSPEND_NUM_OFFSET 3 /* number of values before idle which are -ve */ | |
85 | static const char *const suspend_state_names[] = { | |
86 | "VC_SUSPEND_FORCE_CANCELED", | |
87 | "VC_SUSPEND_REJECTED", | |
88 | "VC_SUSPEND_FAILED", | |
89 | "VC_SUSPEND_IDLE", | |
90 | "VC_SUSPEND_REQUESTED", | |
91 | "VC_SUSPEND_IN_PROGRESS", | |
92 | "VC_SUSPEND_SUSPENDED" | |
93 | }; | |
94 | #define VC_RESUME_NUM_OFFSET 1 /* number of values before idle which are -ve */ | |
95 | static const char *const resume_state_names[] = { | |
96 | "VC_RESUME_FAILED", | |
97 | "VC_RESUME_IDLE", | |
98 | "VC_RESUME_REQUESTED", | |
99 | "VC_RESUME_IN_PROGRESS", | |
100 | "VC_RESUME_RESUMED" | |
101 | }; | |
102 | /* The number of times we allow force suspend to timeout before actually | |
103 | ** _forcing_ suspend. This is to cater for SW which fails to release vchiq | |
104 | ** correctly - we don't want to prevent ARM suspend indefinitely in this case. | |
105 | */ | |
106 | #define FORCE_SUSPEND_FAIL_MAX 8 | |
107 | ||
108 | /* The time in ms allowed for videocore to go idle when force suspend has been | |
109 | * requested */ | |
110 | #define FORCE_SUSPEND_TIMEOUT_MS 200 | |
111 | ||
112 | ||
113 | static void suspend_timer_callback(unsigned long context); | |
114 | ||
115 | ||
116 | typedef struct user_service_struct { | |
117 | VCHIQ_SERVICE_T *service; | |
118 | void *userdata; | |
119 | VCHIQ_INSTANCE_T instance; | |
120 | char is_vchi; | |
121 | char dequeue_pending; | |
122 | char close_pending; | |
123 | int message_available_pos; | |
124 | int msg_insert; | |
125 | int msg_remove; | |
126 | struct semaphore insert_event; | |
127 | struct semaphore remove_event; | |
128 | struct semaphore close_event; | |
129 | VCHIQ_HEADER_T * msg_queue[MSG_QUEUE_SIZE]; | |
130 | } USER_SERVICE_T; | |
131 | ||
132 | struct bulk_waiter_node { | |
133 | struct bulk_waiter bulk_waiter; | |
134 | int pid; | |
135 | struct list_head list; | |
136 | }; | |
137 | ||
138 | struct vchiq_instance_struct { | |
139 | VCHIQ_STATE_T *state; | |
140 | VCHIQ_COMPLETION_DATA_T completions[MAX_COMPLETIONS]; | |
141 | int completion_insert; | |
142 | int completion_remove; | |
143 | struct semaphore insert_event; | |
144 | struct semaphore remove_event; | |
145 | struct mutex completion_mutex; | |
146 | ||
147 | int connected; | |
148 | int closing; | |
149 | int pid; | |
150 | int mark; | |
151 | int use_close_delivered; | |
152 | int trace; | |
153 | ||
154 | struct list_head bulk_waiter_list; | |
155 | struct mutex bulk_waiter_list_mutex; | |
156 | ||
157 | VCHIQ_DEBUGFS_NODE_T debugfs_node; | |
158 | }; | |
159 | ||
160 | typedef struct dump_context_struct { | |
161 | char __user *buf; | |
162 | size_t actual; | |
163 | size_t space; | |
164 | loff_t offset; | |
165 | } DUMP_CONTEXT_T; | |
166 | ||
167 | static struct cdev vchiq_cdev; | |
168 | static dev_t vchiq_devid; | |
169 | static VCHIQ_STATE_T g_state; | |
170 | static struct class *vchiq_class; | |
171 | static struct device *vchiq_dev; | |
172 | static DEFINE_SPINLOCK(msg_queue_spinlock); | |
173 | ||
174 | static const char *const ioctl_names[] = { | |
175 | "CONNECT", | |
176 | "SHUTDOWN", | |
177 | "CREATE_SERVICE", | |
178 | "REMOVE_SERVICE", | |
179 | "QUEUE_MESSAGE", | |
180 | "QUEUE_BULK_TRANSMIT", | |
181 | "QUEUE_BULK_RECEIVE", | |
182 | "AWAIT_COMPLETION", | |
183 | "DEQUEUE_MESSAGE", | |
184 | "GET_CLIENT_ID", | |
185 | "GET_CONFIG", | |
186 | "CLOSE_SERVICE", | |
187 | "USE_SERVICE", | |
188 | "RELEASE_SERVICE", | |
189 | "SET_SERVICE_OPTION", | |
190 | "DUMP_PHYS_MEM", | |
191 | "LIB_VERSION", | |
192 | "CLOSE_DELIVERED" | |
193 | }; | |
194 | ||
5209f93b | 195 | vchiq_static_assert(ARRAY_SIZE(ioctl_names) == |
196 | (VCHIQ_IOC_MAX + 1)); | |
71bad7f0 | 197 | |
12ab1659 | 198 | #if defined(CONFIG_BCM2835_VCHIQ_SUPPORT_MEMDUMP) |
71bad7f0 | 199 | static void |
364d26f1 | 200 | dump_phys_mem(void *virt_addr, u32 num_bytes); |
12ab1659 | 201 | #endif |
71bad7f0 | 202 | |
203 | /**************************************************************************** | |
204 | * | |
205 | * add_completion | |
206 | * | |
207 | ***************************************************************************/ | |
208 | ||
209 | static VCHIQ_STATUS_T | |
210 | add_completion(VCHIQ_INSTANCE_T instance, VCHIQ_REASON_T reason, | |
211 | VCHIQ_HEADER_T *header, USER_SERVICE_T *user_service, | |
212 | void *bulk_userdata) | |
213 | { | |
214 | VCHIQ_COMPLETION_DATA_T *completion; | |
ca3df03b | 215 | int insert; |
6e475350 | 216 | |
71bad7f0 | 217 | DEBUG_INITIALISE(g_state.local) |
218 | ||
ca3df03b PE |
219 | insert = instance->completion_insert; |
220 | while ((insert - instance->completion_remove) >= MAX_COMPLETIONS) { | |
71bad7f0 | 221 | /* Out of space - wait for the client */ |
222 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
223 | vchiq_log_trace(vchiq_arm_log_level, | |
224 | "add_completion - completion queue full"); | |
225 | DEBUG_COUNT(COMPLETION_QUEUE_FULL_COUNT); | |
226 | if (down_interruptible(&instance->remove_event) != 0) { | |
227 | vchiq_log_info(vchiq_arm_log_level, | |
228 | "service_callback interrupted"); | |
229 | return VCHIQ_RETRY; | |
230 | } else if (instance->closing) { | |
231 | vchiq_log_info(vchiq_arm_log_level, | |
232 | "service_callback closing"); | |
5069c86a | 233 | return VCHIQ_SUCCESS; |
71bad7f0 | 234 | } |
235 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
236 | } | |
237 | ||
ca3df03b | 238 | completion = &instance->completions[insert & (MAX_COMPLETIONS - 1)]; |
71bad7f0 | 239 | |
240 | completion->header = header; | |
241 | completion->reason = reason; | |
242 | /* N.B. service_userdata is updated while processing AWAIT_COMPLETION */ | |
243 | completion->service_userdata = user_service->service; | |
244 | completion->bulk_userdata = bulk_userdata; | |
245 | ||
246 | if (reason == VCHIQ_SERVICE_CLOSED) { | |
247 | /* Take an extra reference, to be held until | |
248 | this CLOSED notification is delivered. */ | |
249 | lock_service(user_service->service); | |
250 | if (instance->use_close_delivered) | |
251 | user_service->close_pending = 1; | |
252 | } | |
253 | ||
254 | /* A write barrier is needed here to ensure that the entire completion | |
255 | record is written out before the insert point. */ | |
256 | wmb(); | |
257 | ||
258 | if (reason == VCHIQ_MESSAGE_AVAILABLE) | |
ca3df03b PE |
259 | user_service->message_available_pos = insert; |
260 | ||
261 | insert++; | |
262 | instance->completion_insert = insert; | |
71bad7f0 | 263 | |
264 | up(&instance->insert_event); | |
265 | ||
266 | return VCHIQ_SUCCESS; | |
267 | } | |
268 | ||
269 | /**************************************************************************** | |
270 | * | |
271 | * service_callback | |
272 | * | |
273 | ***************************************************************************/ | |
274 | ||
275 | static VCHIQ_STATUS_T | |
276 | service_callback(VCHIQ_REASON_T reason, VCHIQ_HEADER_T *header, | |
277 | VCHIQ_SERVICE_HANDLE_T handle, void *bulk_userdata) | |
278 | { | |
279 | /* How do we ensure the callback goes to the right client? | |
280 | ** The service_user data points to a USER_SERVICE_T record containing | |
281 | ** the original callback and the user state structure, which contains a | |
282 | ** circular buffer for completion records. | |
283 | */ | |
284 | USER_SERVICE_T *user_service; | |
285 | VCHIQ_SERVICE_T *service; | |
286 | VCHIQ_INSTANCE_T instance; | |
72ed1db4 | 287 | bool skip_completion = false; |
6e475350 | 288 | |
71bad7f0 | 289 | DEBUG_INITIALISE(g_state.local) |
290 | ||
291 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
292 | ||
293 | service = handle_to_service(handle); | |
294 | BUG_ON(!service); | |
295 | user_service = (USER_SERVICE_T *)service->base.userdata; | |
296 | instance = user_service->instance; | |
297 | ||
298 | if (!instance || instance->closing) | |
299 | return VCHIQ_SUCCESS; | |
300 | ||
301 | vchiq_log_trace(vchiq_arm_log_level, | |
302 | "service_callback - service %lx(%d,%p), reason %d, header %lx, " | |
303 | "instance %lx, bulk_userdata %lx", | |
304 | (unsigned long)user_service, | |
305 | service->localport, user_service->userdata, | |
306 | reason, (unsigned long)header, | |
307 | (unsigned long)instance, (unsigned long)bulk_userdata); | |
308 | ||
309 | if (header && user_service->is_vchi) { | |
310 | spin_lock(&msg_queue_spinlock); | |
311 | while (user_service->msg_insert == | |
312 | (user_service->msg_remove + MSG_QUEUE_SIZE)) { | |
313 | spin_unlock(&msg_queue_spinlock); | |
314 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
315 | DEBUG_COUNT(MSG_QUEUE_FULL_COUNT); | |
316 | vchiq_log_trace(vchiq_arm_log_level, | |
317 | "service_callback - msg queue full"); | |
318 | /* If there is no MESSAGE_AVAILABLE in the completion | |
319 | ** queue, add one | |
320 | */ | |
321 | if ((user_service->message_available_pos - | |
322 | instance->completion_remove) < 0) { | |
323 | VCHIQ_STATUS_T status; | |
6e475350 | 324 | |
71bad7f0 | 325 | vchiq_log_info(vchiq_arm_log_level, |
326 | "Inserting extra MESSAGE_AVAILABLE"); | |
327 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
328 | status = add_completion(instance, reason, | |
329 | NULL, user_service, bulk_userdata); | |
330 | if (status != VCHIQ_SUCCESS) { | |
331 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
332 | return status; | |
333 | } | |
334 | } | |
335 | ||
336 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
337 | if (down_interruptible(&user_service->remove_event) | |
338 | != 0) { | |
339 | vchiq_log_info(vchiq_arm_log_level, | |
340 | "service_callback interrupted"); | |
341 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
342 | return VCHIQ_RETRY; | |
343 | } else if (instance->closing) { | |
344 | vchiq_log_info(vchiq_arm_log_level, | |
345 | "service_callback closing"); | |
346 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
347 | return VCHIQ_ERROR; | |
348 | } | |
349 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
350 | spin_lock(&msg_queue_spinlock); | |
351 | } | |
352 | ||
353 | user_service->msg_queue[user_service->msg_insert & | |
354 | (MSG_QUEUE_SIZE - 1)] = header; | |
355 | user_service->msg_insert++; | |
71bad7f0 | 356 | |
357 | /* If there is a thread waiting in DEQUEUE_MESSAGE, or if | |
358 | ** there is a MESSAGE_AVAILABLE in the completion queue then | |
359 | ** bypass the completion queue. | |
360 | */ | |
361 | if (((user_service->message_available_pos - | |
362 | instance->completion_remove) >= 0) || | |
363 | user_service->dequeue_pending) { | |
71bad7f0 | 364 | user_service->dequeue_pending = 0; |
72ed1db4 | 365 | skip_completion = true; |
71bad7f0 | 366 | } |
367 | ||
72ed1db4 PE |
368 | spin_unlock(&msg_queue_spinlock); |
369 | up(&user_service->insert_event); | |
370 | ||
71bad7f0 | 371 | header = NULL; |
372 | } | |
373 | DEBUG_TRACE(SERVICE_CALLBACK_LINE); | |
374 | ||
72ed1db4 PE |
375 | if (skip_completion) |
376 | return VCHIQ_SUCCESS; | |
377 | ||
71bad7f0 | 378 | return add_completion(instance, reason, header, user_service, |
379 | bulk_userdata); | |
380 | } | |
381 | ||
382 | /**************************************************************************** | |
383 | * | |
384 | * user_service_free | |
385 | * | |
386 | ***************************************************************************/ | |
387 | static void | |
388 | user_service_free(void *userdata) | |
389 | { | |
390 | kfree(userdata); | |
391 | } | |
392 | ||
393 | /**************************************************************************** | |
394 | * | |
395 | * close_delivered | |
396 | * | |
397 | ***************************************************************************/ | |
398 | static void close_delivered(USER_SERVICE_T *user_service) | |
399 | { | |
400 | vchiq_log_info(vchiq_arm_log_level, | |
401 | "close_delivered(handle=%x)", | |
402 | user_service->service->handle); | |
403 | ||
404 | if (user_service->close_pending) { | |
405 | /* Allow the underlying service to be culled */ | |
406 | unlock_service(user_service->service); | |
407 | ||
408 | /* Wake the user-thread blocked in close_ or remove_service */ | |
409 | up(&user_service->close_event); | |
410 | ||
411 | user_service->close_pending = 0; | |
412 | } | |
413 | } | |
414 | ||
49bec49f | 415 | struct vchiq_io_copy_callback_context { |
702d8d0f | 416 | struct vchiq_element *current_element; |
49bec49f MZ |
417 | size_t current_element_offset; |
418 | unsigned long elements_to_go; | |
419 | size_t current_offset; | |
420 | }; | |
421 | ||
422 | static ssize_t | |
423 | vchiq_ioc_copy_element_data( | |
424 | void *context, | |
425 | void *dest, | |
426 | size_t offset, | |
427 | size_t maxsize) | |
428 | { | |
429 | long res; | |
430 | size_t bytes_this_round; | |
431 | struct vchiq_io_copy_callback_context *copy_context = | |
432 | (struct vchiq_io_copy_callback_context *)context; | |
433 | ||
434 | if (offset != copy_context->current_offset) | |
435 | return 0; | |
436 | ||
437 | if (!copy_context->elements_to_go) | |
438 | return 0; | |
439 | ||
440 | /* | |
441 | * Complex logic here to handle the case of 0 size elements | |
442 | * in the middle of the array of elements. | |
443 | * | |
444 | * Need to skip over these 0 size elements. | |
445 | */ | |
446 | while (1) { | |
447 | bytes_this_round = min(copy_context->current_element->size - | |
448 | copy_context->current_element_offset, | |
449 | maxsize); | |
450 | ||
451 | if (bytes_this_round) | |
452 | break; | |
453 | ||
454 | copy_context->elements_to_go--; | |
455 | copy_context->current_element++; | |
456 | copy_context->current_element_offset = 0; | |
457 | ||
458 | if (!copy_context->elements_to_go) | |
459 | return 0; | |
460 | } | |
461 | ||
462 | res = copy_from_user(dest, | |
463 | copy_context->current_element->data + | |
464 | copy_context->current_element_offset, | |
465 | bytes_this_round); | |
466 | ||
467 | if (res != 0) | |
468 | return -EFAULT; | |
469 | ||
470 | copy_context->current_element_offset += bytes_this_round; | |
471 | copy_context->current_offset += bytes_this_round; | |
472 | ||
473 | /* | |
474 | * Check if done with current element, and if so advance to the next. | |
475 | */ | |
476 | if (copy_context->current_element_offset == | |
477 | copy_context->current_element->size) { | |
478 | copy_context->elements_to_go--; | |
479 | copy_context->current_element++; | |
480 | copy_context->current_element_offset = 0; | |
481 | } | |
482 | ||
483 | return bytes_this_round; | |
484 | } | |
485 | ||
486 | /************************************************************************** | |
487 | * | |
488 | * vchiq_ioc_queue_message | |
489 | * | |
490 | **************************************************************************/ | |
491 | static VCHIQ_STATUS_T | |
492 | vchiq_ioc_queue_message(VCHIQ_SERVICE_HANDLE_T handle, | |
702d8d0f | 493 | struct vchiq_element *elements, |
49bec49f MZ |
494 | unsigned long count) |
495 | { | |
496 | struct vchiq_io_copy_callback_context context; | |
497 | unsigned long i; | |
498 | size_t total_size = 0; | |
499 | ||
500 | context.current_element = elements; | |
501 | context.current_element_offset = 0; | |
502 | context.elements_to_go = count; | |
503 | context.current_offset = 0; | |
504 | ||
505 | for (i = 0; i < count; i++) { | |
506 | if (!elements[i].data && elements[i].size != 0) | |
507 | return -EFAULT; | |
508 | ||
509 | total_size += elements[i].size; | |
510 | } | |
511 | ||
512 | return vchiq_queue_message(handle, vchiq_ioc_copy_element_data, | |
513 | &context, total_size); | |
514 | } | |
515 | ||
71bad7f0 | 516 | /**************************************************************************** |
517 | * | |
518 | * vchiq_ioctl | |
519 | * | |
520 | ***************************************************************************/ | |
521 | static long | |
522 | vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
523 | { | |
524 | VCHIQ_INSTANCE_T instance = file->private_data; | |
525 | VCHIQ_STATUS_T status = VCHIQ_SUCCESS; | |
526 | VCHIQ_SERVICE_T *service = NULL; | |
527 | long ret = 0; | |
528 | int i, rc; | |
6e475350 | 529 | |
71bad7f0 | 530 | DEBUG_INITIALISE(g_state.local) |
531 | ||
532 | vchiq_log_trace(vchiq_arm_log_level, | |
df044ebf GKH |
533 | "vchiq_ioctl - instance %pK, cmd %s, arg %lx", |
534 | instance, | |
71bad7f0 | 535 | ((_IOC_TYPE(cmd) == VCHIQ_IOC_MAGIC) && |
536 | (_IOC_NR(cmd) <= VCHIQ_IOC_MAX)) ? | |
537 | ioctl_names[_IOC_NR(cmd)] : "<invalid>", arg); | |
538 | ||
539 | switch (cmd) { | |
540 | case VCHIQ_IOC_SHUTDOWN: | |
541 | if (!instance->connected) | |
542 | break; | |
543 | ||
544 | /* Remove all services */ | |
545 | i = 0; | |
546 | while ((service = next_service_by_instance(instance->state, | |
547 | instance, &i)) != NULL) { | |
548 | status = vchiq_remove_service(service->handle); | |
549 | unlock_service(service); | |
550 | if (status != VCHIQ_SUCCESS) | |
551 | break; | |
552 | } | |
553 | service = NULL; | |
554 | ||
555 | if (status == VCHIQ_SUCCESS) { | |
556 | /* Wake the completion thread and ask it to exit */ | |
557 | instance->closing = 1; | |
558 | up(&instance->insert_event); | |
559 | } | |
560 | ||
561 | break; | |
562 | ||
563 | case VCHIQ_IOC_CONNECT: | |
564 | if (instance->connected) { | |
565 | ret = -EINVAL; | |
566 | break; | |
567 | } | |
b826d73b | 568 | rc = mutex_lock_killable(&instance->state->mutex); |
71bad7f0 | 569 | if (rc != 0) { |
570 | vchiq_log_error(vchiq_arm_log_level, | |
571 | "vchiq: connect: could not lock mutex for " | |
572 | "state %d: %d", | |
573 | instance->state->id, rc); | |
574 | ret = -EINTR; | |
575 | break; | |
576 | } | |
577 | status = vchiq_connect_internal(instance->state, instance); | |
578 | mutex_unlock(&instance->state->mutex); | |
579 | ||
580 | if (status == VCHIQ_SUCCESS) | |
581 | instance->connected = 1; | |
582 | else | |
583 | vchiq_log_error(vchiq_arm_log_level, | |
584 | "vchiq: could not connect: %d", status); | |
585 | break; | |
586 | ||
587 | case VCHIQ_IOC_CREATE_SERVICE: { | |
588 | VCHIQ_CREATE_SERVICE_T args; | |
589 | USER_SERVICE_T *user_service = NULL; | |
590 | void *userdata; | |
591 | int srvstate; | |
592 | ||
593 | if (copy_from_user | |
594 | (&args, (const void __user *)arg, | |
595 | sizeof(args)) != 0) { | |
596 | ret = -EFAULT; | |
597 | break; | |
598 | } | |
599 | ||
600 | user_service = kmalloc(sizeof(USER_SERVICE_T), GFP_KERNEL); | |
601 | if (!user_service) { | |
602 | ret = -ENOMEM; | |
603 | break; | |
604 | } | |
605 | ||
606 | if (args.is_open) { | |
607 | if (!instance->connected) { | |
608 | ret = -ENOTCONN; | |
609 | kfree(user_service); | |
610 | break; | |
611 | } | |
612 | srvstate = VCHIQ_SRVSTATE_OPENING; | |
613 | } else { | |
614 | srvstate = | |
615 | instance->connected ? | |
616 | VCHIQ_SRVSTATE_LISTENING : | |
617 | VCHIQ_SRVSTATE_HIDDEN; | |
618 | } | |
619 | ||
620 | userdata = args.params.userdata; | |
621 | args.params.callback = service_callback; | |
622 | args.params.userdata = user_service; | |
623 | service = vchiq_add_service_internal( | |
624 | instance->state, | |
625 | &args.params, srvstate, | |
626 | instance, user_service_free); | |
627 | ||
628 | if (service != NULL) { | |
629 | user_service->service = service; | |
630 | user_service->userdata = userdata; | |
631 | user_service->instance = instance; | |
632 | user_service->is_vchi = (args.is_vchi != 0); | |
633 | user_service->dequeue_pending = 0; | |
634 | user_service->close_pending = 0; | |
635 | user_service->message_available_pos = | |
636 | instance->completion_remove - 1; | |
637 | user_service->msg_insert = 0; | |
638 | user_service->msg_remove = 0; | |
639 | sema_init(&user_service->insert_event, 0); | |
640 | sema_init(&user_service->remove_event, 0); | |
641 | sema_init(&user_service->close_event, 0); | |
642 | ||
643 | if (args.is_open) { | |
644 | status = vchiq_open_service_internal | |
645 | (service, instance->pid); | |
646 | if (status != VCHIQ_SUCCESS) { | |
647 | vchiq_remove_service(service->handle); | |
648 | service = NULL; | |
649 | ret = (status == VCHIQ_RETRY) ? | |
650 | -EINTR : -EIO; | |
651 | break; | |
652 | } | |
653 | } | |
654 | ||
655 | if (copy_to_user((void __user *) | |
656 | &(((VCHIQ_CREATE_SERVICE_T __user *) | |
657 | arg)->handle), | |
658 | (const void *)&service->handle, | |
659 | sizeof(service->handle)) != 0) { | |
660 | ret = -EFAULT; | |
661 | vchiq_remove_service(service->handle); | |
662 | } | |
663 | ||
664 | service = NULL; | |
665 | } else { | |
666 | ret = -EEXIST; | |
667 | kfree(user_service); | |
668 | } | |
669 | } break; | |
670 | ||
671 | case VCHIQ_IOC_CLOSE_SERVICE: { | |
672 | VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; | |
673 | ||
674 | service = find_service_for_instance(instance, handle); | |
675 | if (service != NULL) { | |
676 | USER_SERVICE_T *user_service = | |
677 | (USER_SERVICE_T *)service->base.userdata; | |
678 | /* close_pending is false on first entry, and when the | |
f306ed07 | 679 | wait in vchiq_close_service has been interrupted. */ |
71bad7f0 | 680 | if (!user_service->close_pending) { |
681 | status = vchiq_close_service(service->handle); | |
682 | if (status != VCHIQ_SUCCESS) | |
683 | break; | |
684 | } | |
685 | ||
686 | /* close_pending is true once the underlying service | |
687 | has been closed until the client library calls the | |
688 | CLOSE_DELIVERED ioctl, signalling close_event. */ | |
689 | if (user_service->close_pending && | |
690 | down_interruptible(&user_service->close_event)) | |
691 | status = VCHIQ_RETRY; | |
692 | } | |
693 | else | |
694 | ret = -EINVAL; | |
695 | } break; | |
696 | ||
697 | case VCHIQ_IOC_REMOVE_SERVICE: { | |
698 | VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; | |
699 | ||
700 | service = find_service_for_instance(instance, handle); | |
701 | if (service != NULL) { | |
702 | USER_SERVICE_T *user_service = | |
703 | (USER_SERVICE_T *)service->base.userdata; | |
704 | /* close_pending is false on first entry, and when the | |
f306ed07 | 705 | wait in vchiq_close_service has been interrupted. */ |
71bad7f0 | 706 | if (!user_service->close_pending) { |
707 | status = vchiq_remove_service(service->handle); | |
708 | if (status != VCHIQ_SUCCESS) | |
709 | break; | |
710 | } | |
711 | ||
712 | /* close_pending is true once the underlying service | |
713 | has been closed until the client library calls the | |
714 | CLOSE_DELIVERED ioctl, signalling close_event. */ | |
715 | if (user_service->close_pending && | |
716 | down_interruptible(&user_service->close_event)) | |
717 | status = VCHIQ_RETRY; | |
718 | } | |
719 | else | |
720 | ret = -EINVAL; | |
721 | } break; | |
722 | ||
723 | case VCHIQ_IOC_USE_SERVICE: | |
724 | case VCHIQ_IOC_RELEASE_SERVICE: { | |
725 | VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; | |
726 | ||
727 | service = find_service_for_instance(instance, handle); | |
728 | if (service != NULL) { | |
729 | status = (cmd == VCHIQ_IOC_USE_SERVICE) ? | |
730 | vchiq_use_service_internal(service) : | |
731 | vchiq_release_service_internal(service); | |
732 | if (status != VCHIQ_SUCCESS) { | |
733 | vchiq_log_error(vchiq_susp_log_level, | |
734 | "%s: cmd %s returned error %d for " | |
735 | "service %c%c%c%c:%03d", | |
736 | __func__, | |
737 | (cmd == VCHIQ_IOC_USE_SERVICE) ? | |
738 | "VCHIQ_IOC_USE_SERVICE" : | |
739 | "VCHIQ_IOC_RELEASE_SERVICE", | |
740 | status, | |
741 | VCHIQ_FOURCC_AS_4CHARS( | |
742 | service->base.fourcc), | |
743 | service->client_id); | |
744 | ret = -EINVAL; | |
745 | } | |
746 | } else | |
747 | ret = -EINVAL; | |
748 | } break; | |
749 | ||
750 | case VCHIQ_IOC_QUEUE_MESSAGE: { | |
751 | VCHIQ_QUEUE_MESSAGE_T args; | |
6e475350 | 752 | |
71bad7f0 | 753 | if (copy_from_user |
754 | (&args, (const void __user *)arg, | |
755 | sizeof(args)) != 0) { | |
756 | ret = -EFAULT; | |
757 | break; | |
758 | } | |
759 | ||
760 | service = find_service_for_instance(instance, args.handle); | |
761 | ||
762 | if ((service != NULL) && (args.count <= MAX_ELEMENTS)) { | |
763 | /* Copy elements into kernel space */ | |
702d8d0f | 764 | struct vchiq_element elements[MAX_ELEMENTS]; |
6e475350 | 765 | |
71bad7f0 | 766 | if (copy_from_user(elements, args.elements, |
702d8d0f | 767 | args.count * sizeof(struct vchiq_element)) == 0) |
49bec49f | 768 | status = vchiq_ioc_queue_message |
71bad7f0 | 769 | (args.handle, |
770 | elements, args.count); | |
771 | else | |
772 | ret = -EFAULT; | |
773 | } else { | |
774 | ret = -EINVAL; | |
775 | } | |
776 | } break; | |
777 | ||
778 | case VCHIQ_IOC_QUEUE_BULK_TRANSMIT: | |
779 | case VCHIQ_IOC_QUEUE_BULK_RECEIVE: { | |
780 | VCHIQ_QUEUE_BULK_TRANSFER_T args; | |
781 | struct bulk_waiter_node *waiter = NULL; | |
6e475350 | 782 | |
71bad7f0 | 783 | VCHIQ_BULK_DIR_T dir = |
784 | (cmd == VCHIQ_IOC_QUEUE_BULK_TRANSMIT) ? | |
785 | VCHIQ_BULK_TRANSMIT : VCHIQ_BULK_RECEIVE; | |
786 | ||
787 | if (copy_from_user | |
788 | (&args, (const void __user *)arg, | |
789 | sizeof(args)) != 0) { | |
790 | ret = -EFAULT; | |
791 | break; | |
792 | } | |
793 | ||
794 | service = find_service_for_instance(instance, args.handle); | |
795 | if (!service) { | |
796 | ret = -EINVAL; | |
797 | break; | |
798 | } | |
799 | ||
800 | if (args.mode == VCHIQ_BULK_MODE_BLOCKING) { | |
801 | waiter = kzalloc(sizeof(struct bulk_waiter_node), | |
802 | GFP_KERNEL); | |
803 | if (!waiter) { | |
804 | ret = -ENOMEM; | |
805 | break; | |
806 | } | |
807 | args.userdata = &waiter->bulk_waiter; | |
808 | } else if (args.mode == VCHIQ_BULK_MODE_WAITING) { | |
809 | struct list_head *pos; | |
6e475350 | 810 | |
71bad7f0 | 811 | mutex_lock(&instance->bulk_waiter_list_mutex); |
812 | list_for_each(pos, &instance->bulk_waiter_list) { | |
813 | if (list_entry(pos, struct bulk_waiter_node, | |
814 | list)->pid == current->pid) { | |
815 | waiter = list_entry(pos, | |
816 | struct bulk_waiter_node, | |
817 | list); | |
818 | list_del(pos); | |
819 | break; | |
820 | } | |
821 | ||
822 | } | |
823 | mutex_unlock(&instance->bulk_waiter_list_mutex); | |
824 | if (!waiter) { | |
825 | vchiq_log_error(vchiq_arm_log_level, | |
826 | "no bulk_waiter found for pid %d", | |
827 | current->pid); | |
828 | ret = -ESRCH; | |
829 | break; | |
830 | } | |
831 | vchiq_log_info(vchiq_arm_log_level, | |
df044ebf GKH |
832 | "found bulk_waiter %pK for pid %d", waiter, |
833 | current->pid); | |
71bad7f0 | 834 | args.userdata = &waiter->bulk_waiter; |
835 | } | |
836 | status = vchiq_bulk_transfer | |
837 | (args.handle, | |
838 | VCHI_MEM_HANDLE_INVALID, | |
839 | args.data, args.size, | |
840 | args.userdata, args.mode, | |
841 | dir); | |
842 | if (!waiter) | |
843 | break; | |
844 | if ((status != VCHIQ_RETRY) || fatal_signal_pending(current) || | |
845 | !waiter->bulk_waiter.bulk) { | |
846 | if (waiter->bulk_waiter.bulk) { | |
847 | /* Cancel the signal when the transfer | |
848 | ** completes. */ | |
849 | spin_lock(&bulk_waiter_spinlock); | |
850 | waiter->bulk_waiter.bulk->userdata = NULL; | |
851 | spin_unlock(&bulk_waiter_spinlock); | |
852 | } | |
853 | kfree(waiter); | |
854 | } else { | |
855 | const VCHIQ_BULK_MODE_T mode_waiting = | |
856 | VCHIQ_BULK_MODE_WAITING; | |
857 | waiter->pid = current->pid; | |
858 | mutex_lock(&instance->bulk_waiter_list_mutex); | |
859 | list_add(&waiter->list, &instance->bulk_waiter_list); | |
860 | mutex_unlock(&instance->bulk_waiter_list_mutex); | |
861 | vchiq_log_info(vchiq_arm_log_level, | |
df044ebf GKH |
862 | "saved bulk_waiter %pK for pid %d", |
863 | waiter, current->pid); | |
71bad7f0 | 864 | |
865 | if (copy_to_user((void __user *) | |
866 | &(((VCHIQ_QUEUE_BULK_TRANSFER_T __user *) | |
867 | arg)->mode), | |
868 | (const void *)&mode_waiting, | |
869 | sizeof(mode_waiting)) != 0) | |
870 | ret = -EFAULT; | |
871 | } | |
872 | } break; | |
873 | ||
874 | case VCHIQ_IOC_AWAIT_COMPLETION: { | |
875 | VCHIQ_AWAIT_COMPLETION_T args; | |
876 | ||
877 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); | |
878 | if (!instance->connected) { | |
879 | ret = -ENOTCONN; | |
880 | break; | |
881 | } | |
882 | ||
883 | if (copy_from_user(&args, (const void __user *)arg, | |
884 | sizeof(args)) != 0) { | |
885 | ret = -EFAULT; | |
886 | break; | |
887 | } | |
888 | ||
889 | mutex_lock(&instance->completion_mutex); | |
890 | ||
891 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); | |
892 | while ((instance->completion_remove == | |
893 | instance->completion_insert) | |
894 | && !instance->closing) { | |
895 | int rc; | |
6e475350 | 896 | |
71bad7f0 | 897 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); |
898 | mutex_unlock(&instance->completion_mutex); | |
899 | rc = down_interruptible(&instance->insert_event); | |
900 | mutex_lock(&instance->completion_mutex); | |
901 | if (rc != 0) { | |
902 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); | |
903 | vchiq_log_info(vchiq_arm_log_level, | |
904 | "AWAIT_COMPLETION interrupted"); | |
905 | ret = -EINTR; | |
906 | break; | |
907 | } | |
908 | } | |
909 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); | |
910 | ||
71bad7f0 | 911 | if (ret == 0) { |
912 | int msgbufcount = args.msgbufcount; | |
ca3df03b PE |
913 | int remove = instance->completion_remove; |
914 | ||
71bad7f0 | 915 | for (ret = 0; ret < args.count; ret++) { |
916 | VCHIQ_COMPLETION_DATA_T *completion; | |
917 | VCHIQ_SERVICE_T *service; | |
918 | USER_SERVICE_T *user_service; | |
919 | VCHIQ_HEADER_T *header; | |
ca3df03b PE |
920 | |
921 | if (remove == instance->completion_insert) | |
71bad7f0 | 922 | break; |
ca3df03b | 923 | |
71bad7f0 | 924 | completion = &instance->completions[ |
ca3df03b PE |
925 | remove & (MAX_COMPLETIONS - 1)]; |
926 | ||
927 | /* | |
928 | * A read memory barrier is needed to stop | |
929 | * prefetch of a stale completion record | |
930 | */ | |
931 | rmb(); | |
71bad7f0 | 932 | |
933 | service = completion->service_userdata; | |
934 | user_service = service->base.userdata; | |
935 | completion->service_userdata = | |
936 | user_service->userdata; | |
937 | ||
938 | header = completion->header; | |
939 | if (header) { | |
940 | void __user *msgbuf; | |
941 | int msglen; | |
942 | ||
943 | msglen = header->size + | |
944 | sizeof(VCHIQ_HEADER_T); | |
945 | /* This must be a VCHIQ-style service */ | |
946 | if (args.msgbufsize < msglen) { | |
947 | vchiq_log_error( | |
948 | vchiq_arm_log_level, | |
df044ebf GKH |
949 | "header %pK: msgbufsize %x < msglen %x", |
950 | header, args.msgbufsize, | |
71bad7f0 | 951 | msglen); |
952 | WARN(1, "invalid message " | |
953 | "size\n"); | |
954 | if (ret == 0) | |
955 | ret = -EMSGSIZE; | |
956 | break; | |
957 | } | |
958 | if (msgbufcount <= 0) | |
959 | /* Stall here for lack of a | |
960 | ** buffer for the message. */ | |
961 | break; | |
962 | /* Get the pointer from user space */ | |
963 | msgbufcount--; | |
964 | if (copy_from_user(&msgbuf, | |
965 | (const void __user *) | |
966 | &args.msgbufs[msgbufcount], | |
967 | sizeof(msgbuf)) != 0) { | |
968 | if (ret == 0) | |
969 | ret = -EFAULT; | |
970 | break; | |
971 | } | |
972 | ||
973 | /* Copy the message to user space */ | |
974 | if (copy_to_user(msgbuf, header, | |
975 | msglen) != 0) { | |
976 | if (ret == 0) | |
977 | ret = -EFAULT; | |
978 | break; | |
979 | } | |
980 | ||
981 | /* Now it has been copied, the message | |
982 | ** can be released. */ | |
983 | vchiq_release_message(service->handle, | |
984 | header); | |
985 | ||
986 | /* The completion must point to the | |
987 | ** msgbuf. */ | |
988 | completion->header = msgbuf; | |
989 | } | |
990 | ||
991 | if ((completion->reason == | |
992 | VCHIQ_SERVICE_CLOSED) && | |
993 | !instance->use_close_delivered) | |
994 | unlock_service(service); | |
995 | ||
996 | if (copy_to_user((void __user *)( | |
997 | (size_t)args.buf + | |
998 | ret * sizeof(VCHIQ_COMPLETION_DATA_T)), | |
999 | completion, | |
1000 | sizeof(VCHIQ_COMPLETION_DATA_T)) != 0) { | |
1001 | if (ret == 0) | |
1002 | ret = -EFAULT; | |
1003 | break; | |
1004 | } | |
1005 | ||
ca3df03b PE |
1006 | /* |
1007 | * Ensure that the above copy has completed | |
1008 | * before advancing the remove pointer. | |
1009 | */ | |
1010 | mb(); | |
1011 | remove++; | |
1012 | instance->completion_remove = remove; | |
71bad7f0 | 1013 | } |
1014 | ||
1015 | if (msgbufcount != args.msgbufcount) { | |
1016 | if (copy_to_user((void __user *) | |
1017 | &((VCHIQ_AWAIT_COMPLETION_T *)arg)-> | |
1018 | msgbufcount, | |
1019 | &msgbufcount, | |
1020 | sizeof(msgbufcount)) != 0) { | |
1021 | ret = -EFAULT; | |
1022 | } | |
1023 | } | |
1024 | } | |
1025 | ||
1026 | if (ret != 0) | |
1027 | up(&instance->remove_event); | |
1028 | mutex_unlock(&instance->completion_mutex); | |
1029 | DEBUG_TRACE(AWAIT_COMPLETION_LINE); | |
1030 | } break; | |
1031 | ||
1032 | case VCHIQ_IOC_DEQUEUE_MESSAGE: { | |
1033 | VCHIQ_DEQUEUE_MESSAGE_T args; | |
1034 | USER_SERVICE_T *user_service; | |
1035 | VCHIQ_HEADER_T *header; | |
1036 | ||
1037 | DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); | |
1038 | if (copy_from_user | |
1039 | (&args, (const void __user *)arg, | |
1040 | sizeof(args)) != 0) { | |
1041 | ret = -EFAULT; | |
1042 | break; | |
1043 | } | |
1044 | service = find_service_for_instance(instance, args.handle); | |
1045 | if (!service) { | |
1046 | ret = -EINVAL; | |
1047 | break; | |
1048 | } | |
1049 | user_service = (USER_SERVICE_T *)service->base.userdata; | |
1050 | if (user_service->is_vchi == 0) { | |
1051 | ret = -EINVAL; | |
1052 | break; | |
1053 | } | |
1054 | ||
1055 | spin_lock(&msg_queue_spinlock); | |
1056 | if (user_service->msg_remove == user_service->msg_insert) { | |
1057 | if (!args.blocking) { | |
1058 | spin_unlock(&msg_queue_spinlock); | |
1059 | DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); | |
1060 | ret = -EWOULDBLOCK; | |
1061 | break; | |
1062 | } | |
1063 | user_service->dequeue_pending = 1; | |
1064 | do { | |
1065 | spin_unlock(&msg_queue_spinlock); | |
1066 | DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); | |
1067 | if (down_interruptible( | |
1068 | &user_service->insert_event) != 0) { | |
1069 | vchiq_log_info(vchiq_arm_log_level, | |
1070 | "DEQUEUE_MESSAGE interrupted"); | |
1071 | ret = -EINTR; | |
1072 | break; | |
1073 | } | |
1074 | spin_lock(&msg_queue_spinlock); | |
1075 | } while (user_service->msg_remove == | |
1076 | user_service->msg_insert); | |
1077 | ||
1078 | if (ret) | |
1079 | break; | |
1080 | } | |
1081 | ||
1082 | BUG_ON((int)(user_service->msg_insert - | |
1083 | user_service->msg_remove) < 0); | |
1084 | ||
1085 | header = user_service->msg_queue[user_service->msg_remove & | |
1086 | (MSG_QUEUE_SIZE - 1)]; | |
1087 | user_service->msg_remove++; | |
1088 | spin_unlock(&msg_queue_spinlock); | |
1089 | ||
1090 | up(&user_service->remove_event); | |
1091 | if (header == NULL) | |
1092 | ret = -ENOTCONN; | |
1093 | else if (header->size <= args.bufsize) { | |
1094 | /* Copy to user space if msgbuf is not NULL */ | |
1095 | if ((args.buf == NULL) || | |
1096 | (copy_to_user((void __user *)args.buf, | |
1097 | header->data, | |
1098 | header->size) == 0)) { | |
1099 | ret = header->size; | |
1100 | vchiq_release_message( | |
1101 | service->handle, | |
1102 | header); | |
1103 | } else | |
1104 | ret = -EFAULT; | |
1105 | } else { | |
1106 | vchiq_log_error(vchiq_arm_log_level, | |
df044ebf GKH |
1107 | "header %pK: bufsize %x < size %x", |
1108 | header, args.bufsize, header->size); | |
71bad7f0 | 1109 | WARN(1, "invalid size\n"); |
1110 | ret = -EMSGSIZE; | |
1111 | } | |
1112 | DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); | |
1113 | } break; | |
1114 | ||
1115 | case VCHIQ_IOC_GET_CLIENT_ID: { | |
1116 | VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; | |
1117 | ||
1118 | ret = vchiq_get_client_id(handle); | |
1119 | } break; | |
1120 | ||
1121 | case VCHIQ_IOC_GET_CONFIG: { | |
1122 | VCHIQ_GET_CONFIG_T args; | |
1123 | VCHIQ_CONFIG_T config; | |
1124 | ||
1125 | if (copy_from_user(&args, (const void __user *)arg, | |
1126 | sizeof(args)) != 0) { | |
1127 | ret = -EFAULT; | |
1128 | break; | |
1129 | } | |
1130 | if (args.config_size > sizeof(config)) { | |
1131 | ret = -EINVAL; | |
1132 | break; | |
1133 | } | |
1134 | status = vchiq_get_config(instance, args.config_size, &config); | |
1135 | if (status == VCHIQ_SUCCESS) { | |
1136 | if (copy_to_user((void __user *)args.pconfig, | |
1137 | &config, args.config_size) != 0) { | |
1138 | ret = -EFAULT; | |
1139 | break; | |
1140 | } | |
1141 | } | |
1142 | } break; | |
1143 | ||
1144 | case VCHIQ_IOC_SET_SERVICE_OPTION: { | |
1145 | VCHIQ_SET_SERVICE_OPTION_T args; | |
1146 | ||
1147 | if (copy_from_user( | |
1148 | &args, (const void __user *)arg, | |
1149 | sizeof(args)) != 0) { | |
1150 | ret = -EFAULT; | |
1151 | break; | |
1152 | } | |
1153 | ||
1154 | service = find_service_for_instance(instance, args.handle); | |
1155 | if (!service) { | |
1156 | ret = -EINVAL; | |
1157 | break; | |
1158 | } | |
1159 | ||
1160 | status = vchiq_set_service_option( | |
1161 | args.handle, args.option, args.value); | |
1162 | } break; | |
1163 | ||
12ab1659 | 1164 | #if defined(CONFIG_BCM2835_VCHIQ_SUPPORT_MEMDUMP) |
71bad7f0 | 1165 | case VCHIQ_IOC_DUMP_PHYS_MEM: { |
1166 | VCHIQ_DUMP_MEM_T args; | |
1167 | ||
1168 | if (copy_from_user | |
1169 | (&args, (const void __user *)arg, | |
1170 | sizeof(args)) != 0) { | |
1171 | ret = -EFAULT; | |
1172 | break; | |
1173 | } | |
1174 | dump_phys_mem(args.virt_addr, args.num_bytes); | |
1175 | } break; | |
12ab1659 | 1176 | #endif |
71bad7f0 | 1177 | |
1178 | case VCHIQ_IOC_LIB_VERSION: { | |
1179 | unsigned int lib_version = (unsigned int)arg; | |
1180 | ||
1181 | if (lib_version < VCHIQ_VERSION_MIN) | |
1182 | ret = -EINVAL; | |
1183 | else if (lib_version >= VCHIQ_VERSION_CLOSE_DELIVERED) | |
1184 | instance->use_close_delivered = 1; | |
1185 | } break; | |
1186 | ||
1187 | case VCHIQ_IOC_CLOSE_DELIVERED: { | |
1188 | VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; | |
1189 | ||
1190 | service = find_closed_service_for_instance(instance, handle); | |
1191 | if (service != NULL) { | |
1192 | USER_SERVICE_T *user_service = | |
1193 | (USER_SERVICE_T *)service->base.userdata; | |
1194 | close_delivered(user_service); | |
1195 | } | |
1196 | else | |
1197 | ret = -EINVAL; | |
1198 | } break; | |
1199 | ||
1200 | default: | |
1201 | ret = -ENOTTY; | |
1202 | break; | |
1203 | } | |
1204 | ||
1205 | if (service) | |
1206 | unlock_service(service); | |
1207 | ||
1208 | if (ret == 0) { | |
1209 | if (status == VCHIQ_ERROR) | |
1210 | ret = -EIO; | |
1211 | else if (status == VCHIQ_RETRY) | |
1212 | ret = -EINTR; | |
1213 | } | |
1214 | ||
1215 | if ((status == VCHIQ_SUCCESS) && (ret < 0) && (ret != -EINTR) && | |
1216 | (ret != -EWOULDBLOCK)) | |
1217 | vchiq_log_info(vchiq_arm_log_level, | |
1218 | " ioctl instance %lx, cmd %s -> status %d, %ld", | |
1219 | (unsigned long)instance, | |
1220 | (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ? | |
1221 | ioctl_names[_IOC_NR(cmd)] : | |
1222 | "<invalid>", | |
1223 | status, ret); | |
1224 | else | |
1225 | vchiq_log_trace(vchiq_arm_log_level, | |
1226 | " ioctl instance %lx, cmd %s -> status %d, %ld", | |
1227 | (unsigned long)instance, | |
1228 | (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ? | |
1229 | ioctl_names[_IOC_NR(cmd)] : | |
1230 | "<invalid>", | |
1231 | status, ret); | |
1232 | ||
1233 | return ret; | |
1234 | } | |
1235 | ||
5569a126 MZ |
1236 | #if defined(CONFIG_COMPAT) |
1237 | ||
1238 | struct vchiq_service_params32 { | |
1239 | int fourcc; | |
1240 | compat_uptr_t callback; | |
1241 | compat_uptr_t userdata; | |
1242 | short version; /* Increment for non-trivial changes */ | |
1243 | short version_min; /* Update for incompatible changes */ | |
1244 | }; | |
1245 | ||
1246 | struct vchiq_create_service32 { | |
1247 | struct vchiq_service_params32 params; | |
1248 | int is_open; | |
1249 | int is_vchi; | |
1250 | unsigned int handle; /* OUT */ | |
1251 | }; | |
1252 | ||
1253 | #define VCHIQ_IOC_CREATE_SERVICE32 \ | |
1254 | _IOWR(VCHIQ_IOC_MAGIC, 2, struct vchiq_create_service32) | |
1255 | ||
1256 | static long | |
1257 | vchiq_compat_ioctl_create_service( | |
1258 | struct file *file, | |
1259 | unsigned int cmd, | |
1260 | unsigned long arg) | |
1261 | { | |
1262 | VCHIQ_CREATE_SERVICE_T __user *args; | |
1263 | struct vchiq_create_service32 __user *ptrargs32 = | |
1264 | (struct vchiq_create_service32 __user *)arg; | |
1265 | struct vchiq_create_service32 args32; | |
1266 | long ret; | |
1267 | ||
1268 | args = compat_alloc_user_space(sizeof(*args)); | |
1269 | if (!args) | |
1270 | return -EFAULT; | |
1271 | ||
1272 | if (copy_from_user(&args32, | |
1273 | (struct vchiq_create_service32 __user *)arg, | |
1274 | sizeof(args32))) | |
1275 | return -EFAULT; | |
1276 | ||
1277 | if (put_user(args32.params.fourcc, &args->params.fourcc) || | |
1278 | put_user(compat_ptr(args32.params.callback), | |
1279 | &args->params.callback) || | |
1280 | put_user(compat_ptr(args32.params.userdata), | |
1281 | &args->params.userdata) || | |
1282 | put_user(args32.params.version, &args->params.version) || | |
1283 | put_user(args32.params.version_min, | |
1284 | &args->params.version_min) || | |
1285 | put_user(args32.is_open, &args->is_open) || | |
1286 | put_user(args32.is_vchi, &args->is_vchi) || | |
1287 | put_user(args32.handle, &args->handle)) | |
1288 | return -EFAULT; | |
1289 | ||
1290 | ret = vchiq_ioctl(file, VCHIQ_IOC_CREATE_SERVICE, (unsigned long)args); | |
1291 | ||
1292 | if (ret < 0) | |
1293 | return ret; | |
1294 | ||
1295 | if (get_user(args32.handle, &args->handle)) | |
1296 | return -EFAULT; | |
1297 | ||
1298 | if (copy_to_user(&ptrargs32->handle, | |
1299 | &args32.handle, | |
1300 | sizeof(args32.handle))) | |
1301 | return -EFAULT; | |
1302 | ||
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | struct vchiq_element32 { | |
1307 | compat_uptr_t data; | |
1308 | unsigned int size; | |
1309 | }; | |
1310 | ||
1311 | struct vchiq_queue_message32 { | |
1312 | unsigned int handle; | |
1313 | unsigned int count; | |
1314 | compat_uptr_t elements; | |
1315 | }; | |
1316 | ||
1317 | #define VCHIQ_IOC_QUEUE_MESSAGE32 \ | |
1318 | _IOW(VCHIQ_IOC_MAGIC, 4, struct vchiq_queue_message32) | |
1319 | ||
1320 | static long | |
1321 | vchiq_compat_ioctl_queue_message(struct file *file, | |
1322 | unsigned int cmd, | |
1323 | unsigned long arg) | |
1324 | { | |
1325 | VCHIQ_QUEUE_MESSAGE_T *args; | |
702d8d0f | 1326 | struct vchiq_element *elements; |
5569a126 MZ |
1327 | struct vchiq_queue_message32 args32; |
1328 | unsigned int count; | |
1329 | ||
1330 | if (copy_from_user(&args32, | |
1331 | (struct vchiq_queue_message32 __user *)arg, | |
1332 | sizeof(args32))) | |
1333 | return -EFAULT; | |
1334 | ||
1335 | args = compat_alloc_user_space(sizeof(*args) + | |
1336 | (sizeof(*elements) * MAX_ELEMENTS)); | |
1337 | ||
1338 | if (!args) | |
1339 | return -EFAULT; | |
1340 | ||
1341 | if (put_user(args32.handle, &args->handle) || | |
1342 | put_user(args32.count, &args->count) || | |
1343 | put_user(compat_ptr(args32.elements), &args->elements)) | |
1344 | return -EFAULT; | |
1345 | ||
1346 | if (args32.count > MAX_ELEMENTS) | |
1347 | return -EINVAL; | |
1348 | ||
1349 | if (args32.elements && args32.count) { | |
1350 | struct vchiq_element32 tempelement32[MAX_ELEMENTS]; | |
1351 | ||
702d8d0f | 1352 | elements = (struct vchiq_element __user *)(args + 1); |
5569a126 MZ |
1353 | |
1354 | if (copy_from_user(&tempelement32, | |
1355 | compat_ptr(args32.elements), | |
1356 | sizeof(tempelement32))) | |
1357 | return -EFAULT; | |
1358 | ||
1359 | for (count = 0; count < args32.count; count++) { | |
1360 | if (put_user(compat_ptr(tempelement32[count].data), | |
1361 | &elements[count].data) || | |
1362 | put_user(tempelement32[count].size, | |
1363 | &elements[count].size)) | |
1364 | return -EFAULT; | |
1365 | } | |
1366 | ||
1367 | if (put_user(elements, &args->elements)) | |
1368 | return -EFAULT; | |
1369 | } | |
1370 | ||
1371 | return vchiq_ioctl(file, VCHIQ_IOC_QUEUE_MESSAGE, (unsigned long)args); | |
1372 | } | |
1373 | ||
1374 | struct vchiq_queue_bulk_transfer32 { | |
1375 | unsigned int handle; | |
1376 | compat_uptr_t data; | |
1377 | unsigned int size; | |
1378 | compat_uptr_t userdata; | |
1379 | VCHIQ_BULK_MODE_T mode; | |
1380 | }; | |
1381 | ||
1382 | #define VCHIQ_IOC_QUEUE_BULK_TRANSMIT32 \ | |
1383 | _IOWR(VCHIQ_IOC_MAGIC, 5, struct vchiq_queue_bulk_transfer32) | |
1384 | #define VCHIQ_IOC_QUEUE_BULK_RECEIVE32 \ | |
1385 | _IOWR(VCHIQ_IOC_MAGIC, 6, struct vchiq_queue_bulk_transfer32) | |
1386 | ||
1387 | static long | |
1388 | vchiq_compat_ioctl_queue_bulk(struct file *file, | |
1389 | unsigned int cmd, | |
1390 | unsigned long arg) | |
1391 | { | |
1392 | VCHIQ_QUEUE_BULK_TRANSFER_T *args; | |
1393 | struct vchiq_queue_bulk_transfer32 args32; | |
1394 | struct vchiq_queue_bulk_transfer32 *ptrargs32 = | |
1395 | (struct vchiq_queue_bulk_transfer32 *)arg; | |
1396 | long ret; | |
1397 | ||
1398 | args = compat_alloc_user_space(sizeof(*args)); | |
1399 | if (!args) | |
1400 | return -EFAULT; | |
1401 | ||
1402 | if (copy_from_user(&args32, | |
1403 | (struct vchiq_queue_bulk_transfer32 __user *)arg, | |
1404 | sizeof(args32))) | |
1405 | return -EFAULT; | |
1406 | ||
1407 | if (put_user(args32.handle, &args->handle) || | |
1408 | put_user(compat_ptr(args32.data), &args->data) || | |
1409 | put_user(args32.size, &args->size) || | |
1410 | put_user(compat_ptr(args32.userdata), &args->userdata) || | |
1411 | put_user(args32.mode, &args->mode)) | |
1412 | return -EFAULT; | |
1413 | ||
1414 | if (cmd == VCHIQ_IOC_QUEUE_BULK_TRANSMIT32) | |
1415 | cmd = VCHIQ_IOC_QUEUE_BULK_TRANSMIT; | |
1416 | else | |
1417 | cmd = VCHIQ_IOC_QUEUE_BULK_RECEIVE; | |
1418 | ||
1419 | ret = vchiq_ioctl(file, cmd, (unsigned long)args); | |
1420 | ||
1421 | if (ret < 0) | |
1422 | return ret; | |
1423 | ||
1424 | if (get_user(args32.mode, &args->mode)) | |
1425 | return -EFAULT; | |
1426 | ||
1427 | if (copy_to_user(&ptrargs32->mode, | |
1428 | &args32.mode, | |
1429 | sizeof(args32.mode))) | |
1430 | return -EFAULT; | |
1431 | ||
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | struct vchiq_completion_data32 { | |
1436 | VCHIQ_REASON_T reason; | |
1437 | compat_uptr_t header; | |
1438 | compat_uptr_t service_userdata; | |
1439 | compat_uptr_t bulk_userdata; | |
1440 | }; | |
1441 | ||
1442 | struct vchiq_await_completion32 { | |
1443 | unsigned int count; | |
1444 | compat_uptr_t buf; | |
1445 | unsigned int msgbufsize; | |
1446 | unsigned int msgbufcount; /* IN/OUT */ | |
1447 | compat_uptr_t msgbufs; | |
1448 | }; | |
1449 | ||
1450 | #define VCHIQ_IOC_AWAIT_COMPLETION32 \ | |
1451 | _IOWR(VCHIQ_IOC_MAGIC, 7, struct vchiq_await_completion32) | |
1452 | ||
1453 | static long | |
1454 | vchiq_compat_ioctl_await_completion(struct file *file, | |
1455 | unsigned int cmd, | |
1456 | unsigned long arg) | |
1457 | { | |
1458 | VCHIQ_AWAIT_COMPLETION_T *args; | |
1459 | VCHIQ_COMPLETION_DATA_T *completion; | |
1460 | VCHIQ_COMPLETION_DATA_T completiontemp; | |
1461 | struct vchiq_await_completion32 args32; | |
1462 | struct vchiq_completion_data32 completion32; | |
1463 | unsigned int *msgbufcount32; | |
1464 | compat_uptr_t msgbuf32; | |
1465 | void *msgbuf; | |
1466 | void **msgbufptr; | |
1467 | long ret; | |
1468 | ||
1469 | args = compat_alloc_user_space(sizeof(*args) + | |
1470 | sizeof(*completion) + | |
1471 | sizeof(*msgbufptr)); | |
1472 | if (!args) | |
1473 | return -EFAULT; | |
1474 | ||
1475 | completion = (VCHIQ_COMPLETION_DATA_T *)(args + 1); | |
1476 | msgbufptr = (void __user **)(completion + 1); | |
1477 | ||
1478 | if (copy_from_user(&args32, | |
1479 | (struct vchiq_completion_data32 *)arg, | |
1480 | sizeof(args32))) | |
1481 | return -EFAULT; | |
1482 | ||
1483 | if (put_user(args32.count, &args->count) || | |
1484 | put_user(compat_ptr(args32.buf), &args->buf) || | |
1485 | put_user(args32.msgbufsize, &args->msgbufsize) || | |
1486 | put_user(args32.msgbufcount, &args->msgbufcount) || | |
1487 | put_user(compat_ptr(args32.msgbufs), &args->msgbufs)) | |
1488 | return -EFAULT; | |
1489 | ||
1490 | /* These are simple cases, so just fall into the native handler */ | |
1491 | if (!args32.count || !args32.buf || !args32.msgbufcount) | |
1492 | return vchiq_ioctl(file, | |
1493 | VCHIQ_IOC_AWAIT_COMPLETION, | |
1494 | (unsigned long)args); | |
1495 | ||
1496 | /* | |
1497 | * These are the more complex cases. Typical applications of this | |
1498 | * ioctl will use a very large count, with a very large msgbufcount. | |
1499 | * Since the native ioctl can asynchronously fill in the returned | |
1500 | * buffers and the application can in theory begin processing messages | |
1501 | * even before the ioctl returns, a bit of a trick is used here. | |
1502 | * | |
1503 | * By forcing both count and msgbufcount to be 1, it forces the native | |
1504 | * ioctl to only claim at most 1 message is available. This tricks | |
1505 | * the calling application into thinking only 1 message was actually | |
1506 | * available in the queue so like all good applications it will retry | |
1507 | * waiting until all the required messages are received. | |
1508 | * | |
1509 | * This trick has been tested and proven to work with vchiq_test, | |
1510 | * Minecraft_PI, the "hello pi" examples, and various other | |
1511 | * applications that are included in Raspbian. | |
1512 | */ | |
1513 | ||
1514 | if (copy_from_user(&msgbuf32, | |
1515 | compat_ptr(args32.msgbufs) + | |
1516 | (sizeof(compat_uptr_t) * | |
1517 | (args32.msgbufcount - 1)), | |
1518 | sizeof(msgbuf32))) | |
1519 | return -EFAULT; | |
1520 | ||
1521 | msgbuf = compat_ptr(msgbuf32); | |
1522 | ||
1523 | if (copy_to_user(msgbufptr, | |
1524 | &msgbuf, | |
1525 | sizeof(msgbuf))) | |
1526 | return -EFAULT; | |
1527 | ||
1528 | if (copy_to_user(&args->msgbufs, | |
1529 | &msgbufptr, | |
1530 | sizeof(msgbufptr))) | |
1531 | return -EFAULT; | |
1532 | ||
1533 | if (put_user(1U, &args->count) || | |
1534 | put_user(completion, &args->buf) || | |
1535 | put_user(1U, &args->msgbufcount)) | |
1536 | return -EFAULT; | |
1537 | ||
1538 | ret = vchiq_ioctl(file, | |
1539 | VCHIQ_IOC_AWAIT_COMPLETION, | |
1540 | (unsigned long)args); | |
1541 | ||
1542 | /* | |
1543 | * An return value of 0 here means that no messages where available | |
1544 | * in the message queue. In this case the native ioctl does not | |
1545 | * return any data to the application at all. Not even to update | |
1546 | * msgbufcount. This functionality needs to be kept here for | |
1547 | * compatibility. | |
1548 | * | |
1549 | * Of course, < 0 means that an error occurred and no data is being | |
1550 | * returned. | |
1551 | * | |
1552 | * Since count and msgbufcount was forced to 1, that means | |
1553 | * the only other possible return value is 1. Meaning that 1 message | |
1554 | * was available, so that multiple message case does not need to be | |
1555 | * handled here. | |
1556 | */ | |
1557 | if (ret <= 0) | |
1558 | return ret; | |
1559 | ||
1560 | if (copy_from_user(&completiontemp, completion, sizeof(*completion))) | |
1561 | return -EFAULT; | |
1562 | ||
1563 | completion32.reason = completiontemp.reason; | |
1564 | completion32.header = ptr_to_compat(completiontemp.header); | |
1565 | completion32.service_userdata = | |
1566 | ptr_to_compat(completiontemp.service_userdata); | |
1567 | completion32.bulk_userdata = | |
1568 | ptr_to_compat(completiontemp.bulk_userdata); | |
1569 | ||
1570 | if (copy_to_user(compat_ptr(args32.buf), | |
1571 | &completion32, | |
1572 | sizeof(completion32))) | |
1573 | return -EFAULT; | |
1574 | ||
1575 | args32.msgbufcount--; | |
1576 | ||
1577 | msgbufcount32 = | |
1578 | &((struct vchiq_await_completion32 __user *)arg)->msgbufcount; | |
1579 | ||
1580 | if (copy_to_user(msgbufcount32, | |
1581 | &args32.msgbufcount, | |
1582 | sizeof(args32.msgbufcount))) | |
1583 | return -EFAULT; | |
1584 | ||
1585 | return 1; | |
1586 | } | |
1587 | ||
1588 | struct vchiq_dequeue_message32 { | |
1589 | unsigned int handle; | |
1590 | int blocking; | |
1591 | unsigned int bufsize; | |
1592 | compat_uptr_t buf; | |
1593 | }; | |
1594 | ||
1595 | #define VCHIQ_IOC_DEQUEUE_MESSAGE32 \ | |
1596 | _IOWR(VCHIQ_IOC_MAGIC, 8, struct vchiq_dequeue_message32) | |
1597 | ||
1598 | static long | |
1599 | vchiq_compat_ioctl_dequeue_message(struct file *file, | |
1600 | unsigned int cmd, | |
1601 | unsigned long arg) | |
1602 | { | |
1603 | VCHIQ_DEQUEUE_MESSAGE_T *args; | |
1604 | struct vchiq_dequeue_message32 args32; | |
1605 | ||
1606 | args = compat_alloc_user_space(sizeof(*args)); | |
1607 | if (!args) | |
1608 | return -EFAULT; | |
1609 | ||
1610 | if (copy_from_user(&args32, | |
1611 | (struct vchiq_dequeue_message32 *)arg, | |
1612 | sizeof(args32))) | |
1613 | return -EFAULT; | |
1614 | ||
1615 | if (put_user(args32.handle, &args->handle) || | |
1616 | put_user(args32.blocking, &args->blocking) || | |
1617 | put_user(args32.bufsize, &args->bufsize) || | |
1618 | put_user(compat_ptr(args32.buf), &args->buf)) | |
1619 | return -EFAULT; | |
1620 | ||
1621 | return vchiq_ioctl(file, VCHIQ_IOC_DEQUEUE_MESSAGE, | |
1622 | (unsigned long)args); | |
1623 | } | |
1624 | ||
1625 | struct vchiq_get_config32 { | |
1626 | unsigned int config_size; | |
1627 | compat_uptr_t pconfig; | |
1628 | }; | |
1629 | ||
1630 | #define VCHIQ_IOC_GET_CONFIG32 \ | |
1631 | _IOWR(VCHIQ_IOC_MAGIC, 10, struct vchiq_get_config32) | |
1632 | ||
1633 | static long | |
1634 | vchiq_compat_ioctl_get_config(struct file *file, | |
1635 | unsigned int cmd, | |
1636 | unsigned long arg) | |
1637 | { | |
1638 | VCHIQ_GET_CONFIG_T *args; | |
1639 | struct vchiq_get_config32 args32; | |
1640 | ||
1641 | args = compat_alloc_user_space(sizeof(*args)); | |
1642 | if (!args) | |
1643 | return -EFAULT; | |
1644 | ||
1645 | if (copy_from_user(&args32, | |
1646 | (struct vchiq_get_config32 *)arg, | |
1647 | sizeof(args32))) | |
1648 | return -EFAULT; | |
1649 | ||
1650 | if (put_user(args32.config_size, &args->config_size) || | |
1651 | put_user(compat_ptr(args32.pconfig), &args->pconfig)) | |
1652 | return -EFAULT; | |
1653 | ||
1654 | return vchiq_ioctl(file, VCHIQ_IOC_GET_CONFIG, (unsigned long)args); | |
1655 | } | |
1656 | ||
12ab1659 MZ |
1657 | #if defined(CONFIG_BCM2835_VCHIQ_SUPPORT_MEMDUMP) |
1658 | ||
5569a126 MZ |
1659 | struct vchiq_dump_mem32 { |
1660 | compat_uptr_t virt_addr; | |
1661 | u32 num_bytes; | |
1662 | }; | |
1663 | ||
1664 | #define VCHIQ_IOC_DUMP_PHYS_MEM32 \ | |
1665 | _IOW(VCHIQ_IOC_MAGIC, 15, struct vchiq_dump_mem32) | |
1666 | ||
1667 | static long | |
1668 | vchiq_compat_ioctl_dump_phys_mem(struct file *file, | |
1669 | unsigned int cmd, | |
1670 | unsigned long arg) | |
1671 | { | |
1672 | VCHIQ_DUMP_MEM_T *args; | |
1673 | struct vchiq_dump_mem32 args32; | |
1674 | ||
1675 | args = compat_alloc_user_space(sizeof(*args)); | |
1676 | if (!args) | |
1677 | return -EFAULT; | |
1678 | ||
1679 | if (copy_from_user(&args32, | |
1680 | (struct vchiq_dump_mem32 *)arg, | |
1681 | sizeof(args32))) | |
1682 | return -EFAULT; | |
1683 | ||
1684 | if (put_user(compat_ptr(args32.virt_addr), &args->virt_addr) || | |
1685 | put_user(args32.num_bytes, &args->num_bytes)) | |
1686 | return -EFAULT; | |
1687 | ||
1688 | return vchiq_ioctl(file, VCHIQ_IOC_DUMP_PHYS_MEM, (unsigned long)args); | |
1689 | } | |
1690 | ||
12ab1659 MZ |
1691 | #endif |
1692 | ||
5569a126 MZ |
1693 | static long |
1694 | vchiq_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1695 | { | |
1696 | switch (cmd) { | |
1697 | case VCHIQ_IOC_CREATE_SERVICE32: | |
1698 | return vchiq_compat_ioctl_create_service(file, cmd, arg); | |
1699 | case VCHIQ_IOC_QUEUE_MESSAGE32: | |
1700 | return vchiq_compat_ioctl_queue_message(file, cmd, arg); | |
1701 | case VCHIQ_IOC_QUEUE_BULK_TRANSMIT32: | |
1702 | case VCHIQ_IOC_QUEUE_BULK_RECEIVE32: | |
1703 | return vchiq_compat_ioctl_queue_bulk(file, cmd, arg); | |
1704 | case VCHIQ_IOC_AWAIT_COMPLETION32: | |
1705 | return vchiq_compat_ioctl_await_completion(file, cmd, arg); | |
1706 | case VCHIQ_IOC_DEQUEUE_MESSAGE32: | |
1707 | return vchiq_compat_ioctl_dequeue_message(file, cmd, arg); | |
1708 | case VCHIQ_IOC_GET_CONFIG32: | |
1709 | return vchiq_compat_ioctl_get_config(file, cmd, arg); | |
12ab1659 | 1710 | #if defined(CONFIG_BCM2835_VCHIQ_SUPPORT_MEMDUMP) |
5569a126 MZ |
1711 | case VCHIQ_IOC_DUMP_PHYS_MEM32: |
1712 | return vchiq_compat_ioctl_dump_phys_mem(file, cmd, arg); | |
12ab1659 | 1713 | #endif |
5569a126 MZ |
1714 | default: |
1715 | return vchiq_ioctl(file, cmd, arg); | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | #endif | |
1720 | ||
71bad7f0 | 1721 | /**************************************************************************** |
1722 | * | |
1723 | * vchiq_open | |
1724 | * | |
1725 | ***************************************************************************/ | |
1726 | ||
1727 | static int | |
1728 | vchiq_open(struct inode *inode, struct file *file) | |
1729 | { | |
1730 | int dev = iminor(inode) & 0x0f; | |
6e475350 | 1731 | |
71bad7f0 | 1732 | vchiq_log_info(vchiq_arm_log_level, "vchiq_open"); |
1733 | switch (dev) { | |
1734 | case VCHIQ_MINOR: { | |
1735 | int ret; | |
1736 | VCHIQ_STATE_T *state = vchiq_get_state(); | |
1737 | VCHIQ_INSTANCE_T instance; | |
1738 | ||
1739 | if (!state) { | |
1740 | vchiq_log_error(vchiq_arm_log_level, | |
1741 | "vchiq has no connection to VideoCore"); | |
1742 | return -ENOTCONN; | |
1743 | } | |
1744 | ||
1745 | instance = kzalloc(sizeof(*instance), GFP_KERNEL); | |
1746 | if (!instance) | |
1747 | return -ENOMEM; | |
1748 | ||
1749 | instance->state = state; | |
1750 | instance->pid = current->tgid; | |
1751 | ||
1752 | ret = vchiq_debugfs_add_instance(instance); | |
1753 | if (ret != 0) { | |
1754 | kfree(instance); | |
1755 | return ret; | |
1756 | } | |
1757 | ||
1758 | sema_init(&instance->insert_event, 0); | |
1759 | sema_init(&instance->remove_event, 0); | |
1760 | mutex_init(&instance->completion_mutex); | |
1761 | mutex_init(&instance->bulk_waiter_list_mutex); | |
1762 | INIT_LIST_HEAD(&instance->bulk_waiter_list); | |
1763 | ||
1764 | file->private_data = instance; | |
1765 | } break; | |
1766 | ||
1767 | default: | |
1768 | vchiq_log_error(vchiq_arm_log_level, | |
1769 | "Unknown minor device: %d", dev); | |
1770 | return -ENXIO; | |
1771 | } | |
1772 | ||
1773 | return 0; | |
1774 | } | |
1775 | ||
1776 | /**************************************************************************** | |
1777 | * | |
1778 | * vchiq_release | |
1779 | * | |
1780 | ***************************************************************************/ | |
1781 | ||
1782 | static int | |
1783 | vchiq_release(struct inode *inode, struct file *file) | |
1784 | { | |
1785 | int dev = iminor(inode) & 0x0f; | |
1786 | int ret = 0; | |
6e475350 | 1787 | |
71bad7f0 | 1788 | switch (dev) { |
1789 | case VCHIQ_MINOR: { | |
1790 | VCHIQ_INSTANCE_T instance = file->private_data; | |
1791 | VCHIQ_STATE_T *state = vchiq_get_state(); | |
1792 | VCHIQ_SERVICE_T *service; | |
1793 | int i; | |
1794 | ||
1795 | vchiq_log_info(vchiq_arm_log_level, | |
1796 | "vchiq_release: instance=%lx", | |
1797 | (unsigned long)instance); | |
1798 | ||
1799 | if (!state) { | |
1800 | ret = -EPERM; | |
1801 | goto out; | |
1802 | } | |
1803 | ||
1804 | /* Ensure videocore is awake to allow termination. */ | |
1805 | vchiq_use_internal(instance->state, NULL, | |
1806 | USE_TYPE_VCHIQ); | |
1807 | ||
1808 | mutex_lock(&instance->completion_mutex); | |
1809 | ||
1810 | /* Wake the completion thread and ask it to exit */ | |
1811 | instance->closing = 1; | |
1812 | up(&instance->insert_event); | |
1813 | ||
1814 | mutex_unlock(&instance->completion_mutex); | |
1815 | ||
1816 | /* Wake the slot handler if the completion queue is full. */ | |
1817 | up(&instance->remove_event); | |
1818 | ||
1819 | /* Mark all services for termination... */ | |
1820 | i = 0; | |
1821 | while ((service = next_service_by_instance(state, instance, | |
1822 | &i)) != NULL) { | |
1823 | USER_SERVICE_T *user_service = service->base.userdata; | |
1824 | ||
1825 | /* Wake the slot handler if the msg queue is full. */ | |
1826 | up(&user_service->remove_event); | |
1827 | ||
1828 | vchiq_terminate_service_internal(service); | |
1829 | unlock_service(service); | |
1830 | } | |
1831 | ||
1832 | /* ...and wait for them to die */ | |
1833 | i = 0; | |
1834 | while ((service = next_service_by_instance(state, instance, &i)) | |
1835 | != NULL) { | |
1836 | USER_SERVICE_T *user_service = service->base.userdata; | |
1837 | ||
1838 | down(&service->remove_event); | |
1839 | ||
1840 | BUG_ON(service->srvstate != VCHIQ_SRVSTATE_FREE); | |
1841 | ||
1842 | spin_lock(&msg_queue_spinlock); | |
1843 | ||
1844 | while (user_service->msg_remove != | |
1845 | user_service->msg_insert) { | |
1846 | VCHIQ_HEADER_T *header = user_service-> | |
1847 | msg_queue[user_service->msg_remove & | |
1848 | (MSG_QUEUE_SIZE - 1)]; | |
1849 | user_service->msg_remove++; | |
1850 | spin_unlock(&msg_queue_spinlock); | |
1851 | ||
1852 | if (header) | |
1853 | vchiq_release_message( | |
1854 | service->handle, | |
1855 | header); | |
1856 | spin_lock(&msg_queue_spinlock); | |
1857 | } | |
1858 | ||
1859 | spin_unlock(&msg_queue_spinlock); | |
1860 | ||
1861 | unlock_service(service); | |
1862 | } | |
1863 | ||
1864 | /* Release any closed services */ | |
1865 | while (instance->completion_remove != | |
1866 | instance->completion_insert) { | |
1867 | VCHIQ_COMPLETION_DATA_T *completion; | |
1868 | VCHIQ_SERVICE_T *service; | |
6e475350 | 1869 | |
71bad7f0 | 1870 | completion = &instance->completions[ |
1871 | instance->completion_remove & | |
1872 | (MAX_COMPLETIONS - 1)]; | |
1873 | service = completion->service_userdata; | |
1874 | if (completion->reason == VCHIQ_SERVICE_CLOSED) | |
1875 | { | |
1876 | USER_SERVICE_T *user_service = | |
1877 | service->base.userdata; | |
1878 | ||
1879 | /* Wake any blocked user-thread */ | |
1880 | if (instance->use_close_delivered) | |
1881 | up(&user_service->close_event); | |
1882 | unlock_service(service); | |
1883 | } | |
1884 | instance->completion_remove++; | |
1885 | } | |
1886 | ||
1887 | /* Release the PEER service count. */ | |
1888 | vchiq_release_internal(instance->state, NULL); | |
1889 | ||
1890 | { | |
1891 | struct list_head *pos, *next; | |
6e475350 | 1892 | |
71bad7f0 | 1893 | list_for_each_safe(pos, next, |
1894 | &instance->bulk_waiter_list) { | |
1895 | struct bulk_waiter_node *waiter; | |
6e475350 | 1896 | |
71bad7f0 | 1897 | waiter = list_entry(pos, |
1898 | struct bulk_waiter_node, | |
1899 | list); | |
1900 | list_del(pos); | |
1901 | vchiq_log_info(vchiq_arm_log_level, | |
df044ebf GKH |
1902 | "bulk_waiter - cleaned up %pK for pid %d", |
1903 | waiter, waiter->pid); | |
71bad7f0 | 1904 | kfree(waiter); |
1905 | } | |
1906 | } | |
1907 | ||
1908 | vchiq_debugfs_remove_instance(instance); | |
1909 | ||
1910 | kfree(instance); | |
1911 | file->private_data = NULL; | |
1912 | } break; | |
1913 | ||
1914 | default: | |
1915 | vchiq_log_error(vchiq_arm_log_level, | |
1916 | "Unknown minor device: %d", dev); | |
1917 | ret = -ENXIO; | |
1918 | } | |
1919 | ||
1920 | out: | |
1921 | return ret; | |
1922 | } | |
1923 | ||
1924 | /**************************************************************************** | |
1925 | * | |
1926 | * vchiq_dump | |
1927 | * | |
1928 | ***************************************************************************/ | |
1929 | ||
1930 | void | |
1931 | vchiq_dump(void *dump_context, const char *str, int len) | |
1932 | { | |
1933 | DUMP_CONTEXT_T *context = (DUMP_CONTEXT_T *)dump_context; | |
1934 | ||
1935 | if (context->actual < context->space) { | |
1936 | int copy_bytes; | |
6e475350 | 1937 | |
71bad7f0 | 1938 | if (context->offset > 0) { |
1939 | int skip_bytes = min(len, (int)context->offset); | |
6e475350 | 1940 | |
71bad7f0 | 1941 | str += skip_bytes; |
1942 | len -= skip_bytes; | |
1943 | context->offset -= skip_bytes; | |
1944 | if (context->offset > 0) | |
1945 | return; | |
1946 | } | |
1947 | copy_bytes = min(len, (int)(context->space - context->actual)); | |
1948 | if (copy_bytes == 0) | |
1949 | return; | |
1950 | if (copy_to_user(context->buf + context->actual, str, | |
1951 | copy_bytes)) | |
1952 | context->actual = -EFAULT; | |
1953 | context->actual += copy_bytes; | |
1954 | len -= copy_bytes; | |
1955 | ||
1956 | /* If tne terminating NUL is included in the length, then it | |
1957 | ** marks the end of a line and should be replaced with a | |
1958 | ** carriage return. */ | |
1959 | if ((len == 0) && (str[copy_bytes - 1] == '\0')) { | |
1960 | char cr = '\n'; | |
6e475350 | 1961 | |
71bad7f0 | 1962 | if (copy_to_user(context->buf + context->actual - 1, |
1963 | &cr, 1)) | |
1964 | context->actual = -EFAULT; | |
1965 | } | |
1966 | } | |
1967 | } | |
1968 | ||
1969 | /**************************************************************************** | |
1970 | * | |
1971 | * vchiq_dump_platform_instance_state | |
1972 | * | |
1973 | ***************************************************************************/ | |
1974 | ||
1975 | void | |
1976 | vchiq_dump_platform_instances(void *dump_context) | |
1977 | { | |
1978 | VCHIQ_STATE_T *state = vchiq_get_state(); | |
1979 | char buf[80]; | |
1980 | int len; | |
1981 | int i; | |
1982 | ||
1983 | /* There is no list of instances, so instead scan all services, | |
1984 | marking those that have been dumped. */ | |
1985 | ||
1986 | for (i = 0; i < state->unused_service; i++) { | |
1987 | VCHIQ_SERVICE_T *service = state->services[i]; | |
1988 | VCHIQ_INSTANCE_T instance; | |
1989 | ||
1990 | if (service && (service->base.callback == service_callback)) { | |
1991 | instance = service->instance; | |
1992 | if (instance) | |
1993 | instance->mark = 0; | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | for (i = 0; i < state->unused_service; i++) { | |
1998 | VCHIQ_SERVICE_T *service = state->services[i]; | |
1999 | VCHIQ_INSTANCE_T instance; | |
2000 | ||
2001 | if (service && (service->base.callback == service_callback)) { | |
2002 | instance = service->instance; | |
2003 | if (instance && !instance->mark) { | |
2004 | len = snprintf(buf, sizeof(buf), | |
df044ebf GKH |
2005 | "Instance %pK: pid %d,%s completions %d/%d", |
2006 | instance, instance->pid, | |
71bad7f0 | 2007 | instance->connected ? " connected, " : |
2008 | "", | |
2009 | instance->completion_insert - | |
2010 | instance->completion_remove, | |
2011 | MAX_COMPLETIONS); | |
2012 | ||
2013 | vchiq_dump(dump_context, buf, len + 1); | |
2014 | ||
2015 | instance->mark = 1; | |
2016 | } | |
2017 | } | |
2018 | } | |
2019 | } | |
2020 | ||
2021 | /**************************************************************************** | |
2022 | * | |
2023 | * vchiq_dump_platform_service_state | |
2024 | * | |
2025 | ***************************************************************************/ | |
2026 | ||
2027 | void | |
2028 | vchiq_dump_platform_service_state(void *dump_context, VCHIQ_SERVICE_T *service) | |
2029 | { | |
2030 | USER_SERVICE_T *user_service = (USER_SERVICE_T *)service->base.userdata; | |
2031 | char buf[80]; | |
2032 | int len; | |
2033 | ||
df044ebf | 2034 | len = snprintf(buf, sizeof(buf), " instance %pK", service->instance); |
71bad7f0 | 2035 | |
2036 | if ((service->base.callback == service_callback) && | |
2037 | user_service->is_vchi) { | |
2038 | len += snprintf(buf + len, sizeof(buf) - len, | |
2039 | ", %d/%d messages", | |
2040 | user_service->msg_insert - user_service->msg_remove, | |
2041 | MSG_QUEUE_SIZE); | |
2042 | ||
2043 | if (user_service->dequeue_pending) | |
2044 | len += snprintf(buf + len, sizeof(buf) - len, | |
2045 | " (dequeue pending)"); | |
2046 | } | |
2047 | ||
2048 | vchiq_dump(dump_context, buf, len + 1); | |
2049 | } | |
2050 | ||
2051 | /**************************************************************************** | |
2052 | * | |
2053 | * dump_user_mem | |
2054 | * | |
2055 | ***************************************************************************/ | |
2056 | ||
12ab1659 MZ |
2057 | #if defined(CONFIG_BCM2835_VCHIQ_SUPPORT_MEMDUMP) |
2058 | ||
71bad7f0 | 2059 | static void |
364d26f1 | 2060 | dump_phys_mem(void *virt_addr, u32 num_bytes) |
71bad7f0 | 2061 | { |
2062 | int rc; | |
364d26f1 | 2063 | u8 *end_virt_addr = virt_addr + num_bytes; |
71bad7f0 | 2064 | int num_pages; |
2065 | int offset; | |
2066 | int end_offset; | |
2067 | int page_idx; | |
2068 | int prev_idx; | |
2069 | struct page *page; | |
2070 | struct page **pages; | |
364d26f1 | 2071 | u8 *kmapped_virt_ptr; |
71bad7f0 | 2072 | |
42a6bd8f | 2073 | /* Align virt_addr and end_virt_addr to 16 byte boundaries. */ |
71bad7f0 | 2074 | |
2075 | virt_addr = (void *)((unsigned long)virt_addr & ~0x0fuL); | |
2076 | end_virt_addr = (void *)(((unsigned long)end_virt_addr + 15uL) & | |
2077 | ~0x0fuL); | |
2078 | ||
2079 | offset = (int)(long)virt_addr & (PAGE_SIZE - 1); | |
2080 | end_offset = (int)(long)end_virt_addr & (PAGE_SIZE - 1); | |
2081 | ||
0169acae | 2082 | num_pages = DIV_ROUND_UP(offset + num_bytes, PAGE_SIZE); |
71bad7f0 | 2083 | |
2084 | pages = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); | |
47db0f6c | 2085 | if (!pages) { |
71bad7f0 | 2086 | vchiq_log_error(vchiq_arm_log_level, |
2087 | "Unable to allocation memory for %d pages\n", | |
2088 | num_pages); | |
2089 | return; | |
2090 | } | |
2091 | ||
2092 | down_read(¤t->mm->mmap_sem); | |
166beccd | 2093 | rc = get_user_pages( |
71bad7f0 | 2094 | (unsigned long)virt_addr, /* start */ |
2095 | num_pages, /* len */ | |
768ae309 | 2096 | 0, /* gup_flags */ |
71bad7f0 | 2097 | pages, /* pages (array of page pointers) */ |
2098 | NULL); /* vmas */ | |
2099 | up_read(¤t->mm->mmap_sem); | |
2100 | ||
2101 | prev_idx = -1; | |
2102 | page = NULL; | |
2103 | ||
0feb1ed5 SW |
2104 | if (rc < 0) { |
2105 | vchiq_log_error(vchiq_arm_log_level, | |
2106 | "Failed to get user pages: %d\n", rc); | |
2107 | goto out; | |
2108 | } | |
2109 | ||
71bad7f0 | 2110 | while (offset < end_offset) { |
71bad7f0 | 2111 | int page_offset = offset % PAGE_SIZE; |
71bad7f0 | 2112 | |
6e475350 | 2113 | page_idx = offset / PAGE_SIZE; |
71bad7f0 | 2114 | if (page_idx != prev_idx) { |
71bad7f0 | 2115 | if (page != NULL) |
2116 | kunmap(page); | |
2117 | page = pages[page_idx]; | |
2118 | kmapped_virt_ptr = kmap(page); | |
71bad7f0 | 2119 | prev_idx = page_idx; |
2120 | } | |
2121 | ||
2122 | if (vchiq_arm_log_level >= VCHIQ_LOG_TRACE) | |
2123 | vchiq_log_dump_mem("ph", | |
364d26f1 | 2124 | (u32)(unsigned long)&kmapped_virt_ptr[ |
71bad7f0 | 2125 | page_offset], |
2126 | &kmapped_virt_ptr[page_offset], 16); | |
2127 | ||
2128 | offset += 16; | |
2129 | } | |
0feb1ed5 SW |
2130 | |
2131 | out: | |
71bad7f0 | 2132 | if (page != NULL) |
2133 | kunmap(page); | |
2134 | ||
2135 | for (page_idx = 0; page_idx < num_pages; page_idx++) | |
232664b3 | 2136 | put_page(pages[page_idx]); |
71bad7f0 | 2137 | |
2138 | kfree(pages); | |
2139 | } | |
2140 | ||
12ab1659 MZ |
2141 | #endif |
2142 | ||
71bad7f0 | 2143 | /**************************************************************************** |
2144 | * | |
2145 | * vchiq_read | |
2146 | * | |
2147 | ***************************************************************************/ | |
2148 | ||
2149 | static ssize_t | |
2150 | vchiq_read(struct file *file, char __user *buf, | |
2151 | size_t count, loff_t *ppos) | |
2152 | { | |
2153 | DUMP_CONTEXT_T context; | |
6e475350 | 2154 | |
71bad7f0 | 2155 | context.buf = buf; |
2156 | context.actual = 0; | |
2157 | context.space = count; | |
2158 | context.offset = *ppos; | |
2159 | ||
2160 | vchiq_dump_state(&context, &g_state); | |
2161 | ||
2162 | *ppos += context.actual; | |
2163 | ||
2164 | return context.actual; | |
2165 | } | |
2166 | ||
2167 | VCHIQ_STATE_T * | |
2168 | vchiq_get_state(void) | |
2169 | { | |
2170 | ||
2171 | if (g_state.remote == NULL) | |
2172 | printk(KERN_ERR "%s: g_state.remote == NULL\n", __func__); | |
2173 | else if (g_state.remote->initialised != 1) | |
2174 | printk(KERN_NOTICE "%s: g_state.remote->initialised != 1 (%d)\n", | |
2175 | __func__, g_state.remote->initialised); | |
2176 | ||
2177 | return ((g_state.remote != NULL) && | |
2178 | (g_state.remote->initialised == 1)) ? &g_state : NULL; | |
2179 | } | |
2180 | ||
2181 | static const struct file_operations | |
2182 | vchiq_fops = { | |
2183 | .owner = THIS_MODULE, | |
2184 | .unlocked_ioctl = vchiq_ioctl, | |
5569a126 MZ |
2185 | #if defined(CONFIG_COMPAT) |
2186 | .compat_ioctl = vchiq_compat_ioctl, | |
2187 | #endif | |
71bad7f0 | 2188 | .open = vchiq_open, |
2189 | .release = vchiq_release, | |
2190 | .read = vchiq_read | |
2191 | }; | |
2192 | ||
2193 | /* | |
2194 | * Autosuspend related functionality | |
2195 | */ | |
2196 | ||
2197 | int | |
2198 | vchiq_videocore_wanted(VCHIQ_STATE_T *state) | |
2199 | { | |
2200 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
6e475350 | 2201 | |
71bad7f0 | 2202 | if (!arm_state) |
2203 | /* autosuspend not supported - always return wanted */ | |
2204 | return 1; | |
2205 | else if (arm_state->blocked_count) | |
2206 | return 1; | |
2207 | else if (!arm_state->videocore_use_count) | |
2208 | /* usage count zero - check for override unless we're forcing */ | |
2209 | if (arm_state->resume_blocked) | |
2210 | return 0; | |
2211 | else | |
2212 | return vchiq_platform_videocore_wanted(state); | |
2213 | else | |
2214 | /* non-zero usage count - videocore still required */ | |
2215 | return 1; | |
2216 | } | |
2217 | ||
2218 | static VCHIQ_STATUS_T | |
2219 | vchiq_keepalive_vchiq_callback(VCHIQ_REASON_T reason, | |
2220 | VCHIQ_HEADER_T *header, | |
2221 | VCHIQ_SERVICE_HANDLE_T service_user, | |
2222 | void *bulk_user) | |
2223 | { | |
2224 | vchiq_log_error(vchiq_susp_log_level, | |
2225 | "%s callback reason %d", __func__, reason); | |
2226 | return 0; | |
2227 | } | |
2228 | ||
2229 | static int | |
2230 | vchiq_keepalive_thread_func(void *v) | |
2231 | { | |
2232 | VCHIQ_STATE_T *state = (VCHIQ_STATE_T *) v; | |
2233 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2234 | ||
2235 | VCHIQ_STATUS_T status; | |
2236 | VCHIQ_INSTANCE_T instance; | |
2237 | VCHIQ_SERVICE_HANDLE_T ka_handle; | |
2238 | ||
2239 | VCHIQ_SERVICE_PARAMS_T params = { | |
2240 | .fourcc = VCHIQ_MAKE_FOURCC('K', 'E', 'E', 'P'), | |
2241 | .callback = vchiq_keepalive_vchiq_callback, | |
2242 | .version = KEEPALIVE_VER, | |
2243 | .version_min = KEEPALIVE_VER_MIN | |
2244 | }; | |
2245 | ||
2246 | status = vchiq_initialise(&instance); | |
2247 | if (status != VCHIQ_SUCCESS) { | |
2248 | vchiq_log_error(vchiq_susp_log_level, | |
2249 | "%s vchiq_initialise failed %d", __func__, status); | |
2250 | goto exit; | |
2251 | } | |
2252 | ||
2253 | status = vchiq_connect(instance); | |
2254 | if (status != VCHIQ_SUCCESS) { | |
2255 | vchiq_log_error(vchiq_susp_log_level, | |
2256 | "%s vchiq_connect failed %d", __func__, status); | |
2257 | goto shutdown; | |
2258 | } | |
2259 | ||
2260 | status = vchiq_add_service(instance, ¶ms, &ka_handle); | |
2261 | if (status != VCHIQ_SUCCESS) { | |
2262 | vchiq_log_error(vchiq_susp_log_level, | |
2263 | "%s vchiq_open_service failed %d", __func__, status); | |
2264 | goto shutdown; | |
2265 | } | |
2266 | ||
2267 | while (1) { | |
2268 | long rc = 0, uc = 0; | |
6e475350 | 2269 | |
71bad7f0 | 2270 | if (wait_for_completion_interruptible(&arm_state->ka_evt) |
2271 | != 0) { | |
2272 | vchiq_log_error(vchiq_susp_log_level, | |
2273 | "%s interrupted", __func__); | |
2274 | flush_signals(current); | |
2275 | continue; | |
2276 | } | |
2277 | ||
2278 | /* read and clear counters. Do release_count then use_count to | |
2279 | * prevent getting more releases than uses */ | |
2280 | rc = atomic_xchg(&arm_state->ka_release_count, 0); | |
2281 | uc = atomic_xchg(&arm_state->ka_use_count, 0); | |
2282 | ||
2283 | /* Call use/release service the requisite number of times. | |
2284 | * Process use before release so use counts don't go negative */ | |
2285 | while (uc--) { | |
2286 | atomic_inc(&arm_state->ka_use_ack_count); | |
2287 | status = vchiq_use_service(ka_handle); | |
2288 | if (status != VCHIQ_SUCCESS) { | |
2289 | vchiq_log_error(vchiq_susp_log_level, | |
2290 | "%s vchiq_use_service error %d", | |
2291 | __func__, status); | |
2292 | } | |
2293 | } | |
2294 | while (rc--) { | |
2295 | status = vchiq_release_service(ka_handle); | |
2296 | if (status != VCHIQ_SUCCESS) { | |
2297 | vchiq_log_error(vchiq_susp_log_level, | |
2298 | "%s vchiq_release_service error %d", | |
2299 | __func__, status); | |
2300 | } | |
2301 | } | |
2302 | } | |
2303 | ||
2304 | shutdown: | |
2305 | vchiq_shutdown(instance); | |
2306 | exit: | |
2307 | return 0; | |
2308 | } | |
2309 | ||
2310 | ||
2311 | ||
2312 | VCHIQ_STATUS_T | |
2313 | vchiq_arm_init_state(VCHIQ_STATE_T *state, VCHIQ_ARM_STATE_T *arm_state) | |
2314 | { | |
71bad7f0 | 2315 | if (arm_state) { |
2316 | rwlock_init(&arm_state->susp_res_lock); | |
2317 | ||
2318 | init_completion(&arm_state->ka_evt); | |
2319 | atomic_set(&arm_state->ka_use_count, 0); | |
2320 | atomic_set(&arm_state->ka_use_ack_count, 0); | |
2321 | atomic_set(&arm_state->ka_release_count, 0); | |
2322 | ||
2323 | init_completion(&arm_state->vc_suspend_complete); | |
2324 | ||
2325 | init_completion(&arm_state->vc_resume_complete); | |
2326 | /* Initialise to 'done' state. We only want to block on resume | |
2327 | * completion while videocore is suspended. */ | |
2328 | set_resume_state(arm_state, VC_RESUME_RESUMED); | |
2329 | ||
2330 | init_completion(&arm_state->resume_blocker); | |
2331 | /* Initialise to 'done' state. We only want to block on this | |
2332 | * completion while resume is blocked */ | |
2333 | complete_all(&arm_state->resume_blocker); | |
2334 | ||
2335 | init_completion(&arm_state->blocked_blocker); | |
2336 | /* Initialise to 'done' state. We only want to block on this | |
2337 | * completion while things are waiting on the resume blocker */ | |
2338 | complete_all(&arm_state->blocked_blocker); | |
2339 | ||
2340 | arm_state->suspend_timer_timeout = SUSPEND_TIMER_TIMEOUT_MS; | |
2341 | arm_state->suspend_timer_running = 0; | |
53a6e71f | 2342 | setup_timer(&arm_state->suspend_timer, suspend_timer_callback, |
2343 | (unsigned long)(state)); | |
71bad7f0 | 2344 | |
2345 | arm_state->first_connect = 0; | |
2346 | ||
2347 | } | |
30d84860 | 2348 | return VCHIQ_SUCCESS; |
71bad7f0 | 2349 | } |
2350 | ||
2351 | /* | |
2352 | ** Functions to modify the state variables; | |
2353 | ** set_suspend_state | |
2354 | ** set_resume_state | |
2355 | ** | |
2356 | ** There are more state variables than we might like, so ensure they remain in | |
2357 | ** step. Suspend and resume state are maintained separately, since most of | |
2358 | ** these state machines can operate independently. However, there are a few | |
2359 | ** states where state transitions in one state machine cause a reset to the | |
2360 | ** other state machine. In addition, there are some completion events which | |
2361 | ** need to occur on state machine reset and end-state(s), so these are also | |
2362 | ** dealt with in these functions. | |
2363 | ** | |
2364 | ** In all states we set the state variable according to the input, but in some | |
2365 | ** cases we perform additional steps outlined below; | |
2366 | ** | |
2367 | ** VC_SUSPEND_IDLE - Initialise the suspend completion at the same time. | |
2368 | ** The suspend completion is completed after any suspend | |
2369 | ** attempt. When we reset the state machine we also reset | |
2370 | ** the completion. This reset occurs when videocore is | |
2371 | ** resumed, and also if we initiate suspend after a suspend | |
2372 | ** failure. | |
2373 | ** | |
2374 | ** VC_SUSPEND_IN_PROGRESS - This state is considered the point of no return for | |
2375 | ** suspend - ie from this point on we must try to suspend | |
2376 | ** before resuming can occur. We therefore also reset the | |
2377 | ** resume state machine to VC_RESUME_IDLE in this state. | |
2378 | ** | |
2379 | ** VC_SUSPEND_SUSPENDED - Suspend has completed successfully. Also call | |
2380 | ** complete_all on the suspend completion to notify | |
2381 | ** anything waiting for suspend to happen. | |
2382 | ** | |
2383 | ** VC_SUSPEND_REJECTED - Videocore rejected suspend. Videocore will also | |
2384 | ** initiate resume, so no need to alter resume state. | |
2385 | ** We call complete_all on the suspend completion to notify | |
2386 | ** of suspend rejection. | |
2387 | ** | |
2388 | ** VC_SUSPEND_FAILED - We failed to initiate videocore suspend. We notify the | |
2389 | ** suspend completion and reset the resume state machine. | |
2390 | ** | |
2391 | ** VC_RESUME_IDLE - Initialise the resume completion at the same time. The | |
2392 | ** resume completion is in it's 'done' state whenever | |
608595ed MY |
2393 | ** videcore is running. Therefore, the VC_RESUME_IDLE |
2394 | ** state implies that videocore is suspended. | |
71bad7f0 | 2395 | ** Hence, any thread which needs to wait until videocore is |
2396 | ** running can wait on this completion - it will only block | |
2397 | ** if videocore is suspended. | |
2398 | ** | |
2399 | ** VC_RESUME_RESUMED - Resume has completed successfully. Videocore is running. | |
2400 | ** Call complete_all on the resume completion to unblock | |
2401 | ** any threads waiting for resume. Also reset the suspend | |
2402 | ** state machine to it's idle state. | |
2403 | ** | |
2404 | ** VC_RESUME_FAILED - Currently unused - no mechanism to fail resume exists. | |
2405 | */ | |
2406 | ||
2407 | void | |
2408 | set_suspend_state(VCHIQ_ARM_STATE_T *arm_state, | |
2409 | enum vc_suspend_status new_state) | |
2410 | { | |
2411 | /* set the state in all cases */ | |
2412 | arm_state->vc_suspend_state = new_state; | |
2413 | ||
2414 | /* state specific additional actions */ | |
2415 | switch (new_state) { | |
2416 | case VC_SUSPEND_FORCE_CANCELED: | |
2417 | complete_all(&arm_state->vc_suspend_complete); | |
2418 | break; | |
2419 | case VC_SUSPEND_REJECTED: | |
2420 | complete_all(&arm_state->vc_suspend_complete); | |
2421 | break; | |
2422 | case VC_SUSPEND_FAILED: | |
2423 | complete_all(&arm_state->vc_suspend_complete); | |
2424 | arm_state->vc_resume_state = VC_RESUME_RESUMED; | |
2425 | complete_all(&arm_state->vc_resume_complete); | |
2426 | break; | |
2427 | case VC_SUSPEND_IDLE: | |
2428 | reinit_completion(&arm_state->vc_suspend_complete); | |
2429 | break; | |
2430 | case VC_SUSPEND_REQUESTED: | |
2431 | break; | |
2432 | case VC_SUSPEND_IN_PROGRESS: | |
2433 | set_resume_state(arm_state, VC_RESUME_IDLE); | |
2434 | break; | |
2435 | case VC_SUSPEND_SUSPENDED: | |
2436 | complete_all(&arm_state->vc_suspend_complete); | |
2437 | break; | |
2438 | default: | |
2439 | BUG(); | |
2440 | break; | |
2441 | } | |
2442 | } | |
2443 | ||
2444 | void | |
2445 | set_resume_state(VCHIQ_ARM_STATE_T *arm_state, | |
2446 | enum vc_resume_status new_state) | |
2447 | { | |
2448 | /* set the state in all cases */ | |
2449 | arm_state->vc_resume_state = new_state; | |
2450 | ||
2451 | /* state specific additional actions */ | |
2452 | switch (new_state) { | |
2453 | case VC_RESUME_FAILED: | |
2454 | break; | |
2455 | case VC_RESUME_IDLE: | |
2456 | reinit_completion(&arm_state->vc_resume_complete); | |
2457 | break; | |
2458 | case VC_RESUME_REQUESTED: | |
2459 | break; | |
2460 | case VC_RESUME_IN_PROGRESS: | |
2461 | break; | |
2462 | case VC_RESUME_RESUMED: | |
2463 | complete_all(&arm_state->vc_resume_complete); | |
2464 | set_suspend_state(arm_state, VC_SUSPEND_IDLE); | |
2465 | break; | |
2466 | default: | |
2467 | BUG(); | |
2468 | break; | |
2469 | } | |
2470 | } | |
2471 | ||
2472 | ||
2473 | /* should be called with the write lock held */ | |
2474 | inline void | |
2475 | start_suspend_timer(VCHIQ_ARM_STATE_T *arm_state) | |
2476 | { | |
2477 | del_timer(&arm_state->suspend_timer); | |
2478 | arm_state->suspend_timer.expires = jiffies + | |
2479 | msecs_to_jiffies(arm_state-> | |
2480 | suspend_timer_timeout); | |
2481 | add_timer(&arm_state->suspend_timer); | |
2482 | arm_state->suspend_timer_running = 1; | |
2483 | } | |
2484 | ||
2485 | /* should be called with the write lock held */ | |
2486 | static inline void | |
2487 | stop_suspend_timer(VCHIQ_ARM_STATE_T *arm_state) | |
2488 | { | |
2489 | if (arm_state->suspend_timer_running) { | |
2490 | del_timer(&arm_state->suspend_timer); | |
2491 | arm_state->suspend_timer_running = 0; | |
2492 | } | |
2493 | } | |
2494 | ||
2495 | static inline int | |
2496 | need_resume(VCHIQ_STATE_T *state) | |
2497 | { | |
2498 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
6e475350 | 2499 | |
71bad7f0 | 2500 | return (arm_state->vc_suspend_state > VC_SUSPEND_IDLE) && |
2501 | (arm_state->vc_resume_state < VC_RESUME_REQUESTED) && | |
2502 | vchiq_videocore_wanted(state); | |
2503 | } | |
2504 | ||
2505 | static int | |
2506 | block_resume(VCHIQ_ARM_STATE_T *arm_state) | |
2507 | { | |
2508 | int status = VCHIQ_SUCCESS; | |
2509 | const unsigned long timeout_val = | |
2510 | msecs_to_jiffies(FORCE_SUSPEND_TIMEOUT_MS); | |
2511 | int resume_count = 0; | |
2512 | ||
2513 | /* Allow any threads which were blocked by the last force suspend to | |
2514 | * complete if they haven't already. Only give this one shot; if | |
2515 | * blocked_count is incremented after blocked_blocker is completed | |
2516 | * (which only happens when blocked_count hits 0) then those threads | |
2517 | * will have to wait until next time around */ | |
2518 | if (arm_state->blocked_count) { | |
2519 | reinit_completion(&arm_state->blocked_blocker); | |
2520 | write_unlock_bh(&arm_state->susp_res_lock); | |
2521 | vchiq_log_info(vchiq_susp_log_level, "%s wait for previously " | |
2522 | "blocked clients", __func__); | |
2523 | if (wait_for_completion_interruptible_timeout( | |
2524 | &arm_state->blocked_blocker, timeout_val) | |
2525 | <= 0) { | |
2526 | vchiq_log_error(vchiq_susp_log_level, "%s wait for " | |
b33050d0 | 2527 | "previously blocked clients failed", __func__); |
71bad7f0 | 2528 | status = VCHIQ_ERROR; |
2529 | write_lock_bh(&arm_state->susp_res_lock); | |
2530 | goto out; | |
2531 | } | |
2532 | vchiq_log_info(vchiq_susp_log_level, "%s previously blocked " | |
2533 | "clients resumed", __func__); | |
2534 | write_lock_bh(&arm_state->susp_res_lock); | |
2535 | } | |
2536 | ||
2537 | /* We need to wait for resume to complete if it's in process */ | |
2538 | while (arm_state->vc_resume_state != VC_RESUME_RESUMED && | |
2539 | arm_state->vc_resume_state > VC_RESUME_IDLE) { | |
2540 | if (resume_count > 1) { | |
2541 | status = VCHIQ_ERROR; | |
2542 | vchiq_log_error(vchiq_susp_log_level, "%s waited too " | |
b33050d0 | 2543 | "many times for resume", __func__); |
71bad7f0 | 2544 | goto out; |
2545 | } | |
2546 | write_unlock_bh(&arm_state->susp_res_lock); | |
2547 | vchiq_log_info(vchiq_susp_log_level, "%s wait for resume", | |
2548 | __func__); | |
2549 | if (wait_for_completion_interruptible_timeout( | |
2550 | &arm_state->vc_resume_complete, timeout_val) | |
2551 | <= 0) { | |
2552 | vchiq_log_error(vchiq_susp_log_level, "%s wait for " | |
2553 | "resume failed (%s)", __func__, | |
2554 | resume_state_names[arm_state->vc_resume_state + | |
2555 | VC_RESUME_NUM_OFFSET]); | |
2556 | status = VCHIQ_ERROR; | |
2557 | write_lock_bh(&arm_state->susp_res_lock); | |
2558 | goto out; | |
2559 | } | |
2560 | vchiq_log_info(vchiq_susp_log_level, "%s resumed", __func__); | |
2561 | write_lock_bh(&arm_state->susp_res_lock); | |
2562 | resume_count++; | |
2563 | } | |
2564 | reinit_completion(&arm_state->resume_blocker); | |
2565 | arm_state->resume_blocked = 1; | |
2566 | ||
2567 | out: | |
2568 | return status; | |
2569 | } | |
2570 | ||
2571 | static inline void | |
2572 | unblock_resume(VCHIQ_ARM_STATE_T *arm_state) | |
2573 | { | |
2574 | complete_all(&arm_state->resume_blocker); | |
2575 | arm_state->resume_blocked = 0; | |
2576 | } | |
2577 | ||
2578 | /* Initiate suspend via slot handler. Should be called with the write lock | |
2579 | * held */ | |
2580 | VCHIQ_STATUS_T | |
2581 | vchiq_arm_vcsuspend(VCHIQ_STATE_T *state) | |
2582 | { | |
2583 | VCHIQ_STATUS_T status = VCHIQ_ERROR; | |
2584 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2585 | ||
2586 | if (!arm_state) | |
2587 | goto out; | |
2588 | ||
2589 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2590 | status = VCHIQ_SUCCESS; | |
2591 | ||
2592 | ||
2593 | switch (arm_state->vc_suspend_state) { | |
2594 | case VC_SUSPEND_REQUESTED: | |
2595 | vchiq_log_info(vchiq_susp_log_level, "%s: suspend already " | |
2596 | "requested", __func__); | |
2597 | break; | |
2598 | case VC_SUSPEND_IN_PROGRESS: | |
2599 | vchiq_log_info(vchiq_susp_log_level, "%s: suspend already in " | |
2600 | "progress", __func__); | |
2601 | break; | |
2602 | ||
2603 | default: | |
2604 | /* We don't expect to be in other states, so log but continue | |
2605 | * anyway */ | |
2606 | vchiq_log_error(vchiq_susp_log_level, | |
2607 | "%s unexpected suspend state %s", __func__, | |
2608 | suspend_state_names[arm_state->vc_suspend_state + | |
2609 | VC_SUSPEND_NUM_OFFSET]); | |
2610 | /* fall through */ | |
2611 | case VC_SUSPEND_REJECTED: | |
2612 | case VC_SUSPEND_FAILED: | |
2613 | /* Ensure any idle state actions have been run */ | |
2614 | set_suspend_state(arm_state, VC_SUSPEND_IDLE); | |
2615 | /* fall through */ | |
2616 | case VC_SUSPEND_IDLE: | |
2617 | vchiq_log_info(vchiq_susp_log_level, | |
2618 | "%s: suspending", __func__); | |
2619 | set_suspend_state(arm_state, VC_SUSPEND_REQUESTED); | |
2620 | /* kick the slot handler thread to initiate suspend */ | |
2621 | request_poll(state, NULL, 0); | |
2622 | break; | |
2623 | } | |
2624 | ||
2625 | out: | |
2626 | vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, status); | |
2627 | return status; | |
2628 | } | |
2629 | ||
2630 | void | |
2631 | vchiq_platform_check_suspend(VCHIQ_STATE_T *state) | |
2632 | { | |
2633 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2634 | int susp = 0; | |
2635 | ||
2636 | if (!arm_state) | |
2637 | goto out; | |
2638 | ||
2639 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2640 | ||
2641 | write_lock_bh(&arm_state->susp_res_lock); | |
2642 | if (arm_state->vc_suspend_state == VC_SUSPEND_REQUESTED && | |
2643 | arm_state->vc_resume_state == VC_RESUME_RESUMED) { | |
2644 | set_suspend_state(arm_state, VC_SUSPEND_IN_PROGRESS); | |
2645 | susp = 1; | |
2646 | } | |
2647 | write_unlock_bh(&arm_state->susp_res_lock); | |
2648 | ||
2649 | if (susp) | |
2650 | vchiq_platform_suspend(state); | |
2651 | ||
2652 | out: | |
2653 | vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__); | |
2654 | return; | |
2655 | } | |
2656 | ||
2657 | ||
2658 | static void | |
2659 | output_timeout_error(VCHIQ_STATE_T *state) | |
2660 | { | |
2661 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
6d5f49a9 | 2662 | char err[50] = ""; |
71bad7f0 | 2663 | int vc_use_count = arm_state->videocore_use_count; |
2664 | int active_services = state->unused_service; | |
2665 | int i; | |
2666 | ||
2667 | if (!arm_state->videocore_use_count) { | |
6d5f49a9 | 2668 | snprintf(err, sizeof(err), " Videocore usecount is 0"); |
71bad7f0 | 2669 | goto output_msg; |
2670 | } | |
2671 | for (i = 0; i < active_services; i++) { | |
2672 | VCHIQ_SERVICE_T *service_ptr = state->services[i]; | |
6e475350 | 2673 | |
71bad7f0 | 2674 | if (service_ptr && service_ptr->service_use_count && |
2675 | (service_ptr->srvstate != VCHIQ_SRVSTATE_FREE)) { | |
6d5f49a9 | 2676 | snprintf(err, sizeof(err), " %c%c%c%c(%d) service has " |
71bad7f0 | 2677 | "use count %d%s", VCHIQ_FOURCC_AS_4CHARS( |
2678 | service_ptr->base.fourcc), | |
2679 | service_ptr->client_id, | |
2680 | service_ptr->service_use_count, | |
2681 | service_ptr->service_use_count == | |
2682 | vc_use_count ? "" : " (+ more)"); | |
2683 | break; | |
2684 | } | |
2685 | } | |
2686 | ||
2687 | output_msg: | |
2688 | vchiq_log_error(vchiq_susp_log_level, | |
2689 | "timed out waiting for vc suspend (%d).%s", | |
6d5f49a9 | 2690 | arm_state->autosuspend_override, err); |
71bad7f0 | 2691 | |
2692 | } | |
2693 | ||
2694 | /* Try to get videocore into suspended state, regardless of autosuspend state. | |
2695 | ** We don't actually force suspend, since videocore may get into a bad state | |
2696 | ** if we force suspend at a bad time. Instead, we wait for autosuspend to | |
2697 | ** determine a good point to suspend. If this doesn't happen within 100ms we | |
2698 | ** report failure. | |
2699 | ** | |
2700 | ** Returns VCHIQ_SUCCESS if videocore suspended successfully, VCHIQ_RETRY if | |
2701 | ** videocore failed to suspend in time or VCHIQ_ERROR if interrupted. | |
2702 | */ | |
2703 | VCHIQ_STATUS_T | |
2704 | vchiq_arm_force_suspend(VCHIQ_STATE_T *state) | |
2705 | { | |
2706 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2707 | VCHIQ_STATUS_T status = VCHIQ_ERROR; | |
2708 | long rc = 0; | |
2709 | int repeat = -1; | |
2710 | ||
2711 | if (!arm_state) | |
2712 | goto out; | |
2713 | ||
2714 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2715 | ||
2716 | write_lock_bh(&arm_state->susp_res_lock); | |
2717 | ||
2718 | status = block_resume(arm_state); | |
2719 | if (status != VCHIQ_SUCCESS) | |
2720 | goto unlock; | |
2721 | if (arm_state->vc_suspend_state == VC_SUSPEND_SUSPENDED) { | |
2722 | /* Already suspended - just block resume and exit */ | |
2723 | vchiq_log_info(vchiq_susp_log_level, "%s already suspended", | |
2724 | __func__); | |
2725 | status = VCHIQ_SUCCESS; | |
2726 | goto unlock; | |
2727 | } else if (arm_state->vc_suspend_state <= VC_SUSPEND_IDLE) { | |
2728 | /* initiate suspend immediately in the case that we're waiting | |
2729 | * for the timeout */ | |
2730 | stop_suspend_timer(arm_state); | |
2731 | if (!vchiq_videocore_wanted(state)) { | |
2732 | vchiq_log_info(vchiq_susp_log_level, "%s videocore " | |
2733 | "idle, initiating suspend", __func__); | |
2734 | status = vchiq_arm_vcsuspend(state); | |
2735 | } else if (arm_state->autosuspend_override < | |
2736 | FORCE_SUSPEND_FAIL_MAX) { | |
2737 | vchiq_log_info(vchiq_susp_log_level, "%s letting " | |
2738 | "videocore go idle", __func__); | |
2739 | status = VCHIQ_SUCCESS; | |
2740 | } else { | |
2741 | vchiq_log_warning(vchiq_susp_log_level, "%s failed too " | |
2742 | "many times - attempting suspend", __func__); | |
2743 | status = vchiq_arm_vcsuspend(state); | |
2744 | } | |
2745 | } else { | |
2746 | vchiq_log_info(vchiq_susp_log_level, "%s videocore suspend " | |
2747 | "in progress - wait for completion", __func__); | |
2748 | status = VCHIQ_SUCCESS; | |
2749 | } | |
2750 | ||
2751 | /* Wait for suspend to happen due to system idle (not forced..) */ | |
2752 | if (status != VCHIQ_SUCCESS) | |
2753 | goto unblock_resume; | |
2754 | ||
2755 | do { | |
2756 | write_unlock_bh(&arm_state->susp_res_lock); | |
2757 | ||
2758 | rc = wait_for_completion_interruptible_timeout( | |
2759 | &arm_state->vc_suspend_complete, | |
2760 | msecs_to_jiffies(FORCE_SUSPEND_TIMEOUT_MS)); | |
2761 | ||
2762 | write_lock_bh(&arm_state->susp_res_lock); | |
2763 | if (rc < 0) { | |
2764 | vchiq_log_warning(vchiq_susp_log_level, "%s " | |
2765 | "interrupted waiting for suspend", __func__); | |
2766 | status = VCHIQ_ERROR; | |
2767 | goto unblock_resume; | |
2768 | } else if (rc == 0) { | |
2769 | if (arm_state->vc_suspend_state > VC_SUSPEND_IDLE) { | |
2770 | /* Repeat timeout once if in progress */ | |
2771 | if (repeat < 0) { | |
2772 | repeat = 1; | |
2773 | continue; | |
2774 | } | |
2775 | } | |
2776 | arm_state->autosuspend_override++; | |
2777 | output_timeout_error(state); | |
2778 | ||
2779 | status = VCHIQ_RETRY; | |
2780 | goto unblock_resume; | |
2781 | } | |
2782 | } while (0 < (repeat--)); | |
2783 | ||
2784 | /* Check and report state in case we need to abort ARM suspend */ | |
2785 | if (arm_state->vc_suspend_state != VC_SUSPEND_SUSPENDED) { | |
2786 | status = VCHIQ_RETRY; | |
2787 | vchiq_log_error(vchiq_susp_log_level, | |
2788 | "%s videocore suspend failed (state %s)", __func__, | |
2789 | suspend_state_names[arm_state->vc_suspend_state + | |
2790 | VC_SUSPEND_NUM_OFFSET]); | |
2791 | /* Reset the state only if it's still in an error state. | |
2792 | * Something could have already initiated another suspend. */ | |
2793 | if (arm_state->vc_suspend_state < VC_SUSPEND_IDLE) | |
2794 | set_suspend_state(arm_state, VC_SUSPEND_IDLE); | |
2795 | ||
2796 | goto unblock_resume; | |
2797 | } | |
2798 | ||
2799 | /* successfully suspended - unlock and exit */ | |
2800 | goto unlock; | |
2801 | ||
2802 | unblock_resume: | |
2803 | /* all error states need to unblock resume before exit */ | |
2804 | unblock_resume(arm_state); | |
2805 | ||
2806 | unlock: | |
2807 | write_unlock_bh(&arm_state->susp_res_lock); | |
2808 | ||
2809 | out: | |
2810 | vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, status); | |
2811 | return status; | |
2812 | } | |
2813 | ||
2814 | void | |
2815 | vchiq_check_suspend(VCHIQ_STATE_T *state) | |
2816 | { | |
2817 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2818 | ||
2819 | if (!arm_state) | |
2820 | goto out; | |
2821 | ||
2822 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2823 | ||
2824 | write_lock_bh(&arm_state->susp_res_lock); | |
2825 | if (arm_state->vc_suspend_state != VC_SUSPEND_SUSPENDED && | |
2826 | arm_state->first_connect && | |
2827 | !vchiq_videocore_wanted(state)) { | |
2828 | vchiq_arm_vcsuspend(state); | |
2829 | } | |
2830 | write_unlock_bh(&arm_state->susp_res_lock); | |
2831 | ||
2832 | out: | |
2833 | vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__); | |
2834 | return; | |
2835 | } | |
2836 | ||
2837 | ||
2838 | int | |
2839 | vchiq_arm_allow_resume(VCHIQ_STATE_T *state) | |
2840 | { | |
2841 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2842 | int resume = 0; | |
2843 | int ret = -1; | |
2844 | ||
2845 | if (!arm_state) | |
2846 | goto out; | |
2847 | ||
2848 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2849 | ||
2850 | write_lock_bh(&arm_state->susp_res_lock); | |
2851 | unblock_resume(arm_state); | |
2852 | resume = vchiq_check_resume(state); | |
2853 | write_unlock_bh(&arm_state->susp_res_lock); | |
2854 | ||
2855 | if (resume) { | |
2856 | if (wait_for_completion_interruptible( | |
2857 | &arm_state->vc_resume_complete) < 0) { | |
2858 | vchiq_log_error(vchiq_susp_log_level, | |
2859 | "%s interrupted", __func__); | |
2860 | /* failed, cannot accurately derive suspend | |
2861 | * state, so exit early. */ | |
2862 | goto out; | |
2863 | } | |
2864 | } | |
2865 | ||
2866 | read_lock_bh(&arm_state->susp_res_lock); | |
2867 | if (arm_state->vc_suspend_state == VC_SUSPEND_SUSPENDED) { | |
2868 | vchiq_log_info(vchiq_susp_log_level, | |
2869 | "%s: Videocore remains suspended", __func__); | |
2870 | } else { | |
2871 | vchiq_log_info(vchiq_susp_log_level, | |
2872 | "%s: Videocore resumed", __func__); | |
2873 | ret = 0; | |
2874 | } | |
2875 | read_unlock_bh(&arm_state->susp_res_lock); | |
2876 | out: | |
2877 | vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret); | |
2878 | return ret; | |
2879 | } | |
2880 | ||
2881 | /* This function should be called with the write lock held */ | |
2882 | int | |
2883 | vchiq_check_resume(VCHIQ_STATE_T *state) | |
2884 | { | |
2885 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2886 | int resume = 0; | |
2887 | ||
2888 | if (!arm_state) | |
2889 | goto out; | |
2890 | ||
2891 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2892 | ||
2893 | if (need_resume(state)) { | |
2894 | set_resume_state(arm_state, VC_RESUME_REQUESTED); | |
2895 | request_poll(state, NULL, 0); | |
2896 | resume = 1; | |
2897 | } | |
2898 | ||
2899 | out: | |
2900 | vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__); | |
2901 | return resume; | |
2902 | } | |
2903 | ||
71bad7f0 | 2904 | VCHIQ_STATUS_T |
2905 | vchiq_use_internal(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service, | |
2906 | enum USE_TYPE_E use_type) | |
2907 | { | |
2908 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
2909 | VCHIQ_STATUS_T ret = VCHIQ_SUCCESS; | |
2910 | char entity[16]; | |
2911 | int *entity_uc; | |
2912 | int local_uc, local_entity_uc; | |
2913 | ||
2914 | if (!arm_state) | |
2915 | goto out; | |
2916 | ||
2917 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
2918 | ||
2919 | if (use_type == USE_TYPE_VCHIQ) { | |
2920 | sprintf(entity, "VCHIQ: "); | |
2921 | entity_uc = &arm_state->peer_use_count; | |
2922 | } else if (service) { | |
2923 | sprintf(entity, "%c%c%c%c:%03d", | |
2924 | VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc), | |
2925 | service->client_id); | |
2926 | entity_uc = &service->service_use_count; | |
2927 | } else { | |
2928 | vchiq_log_error(vchiq_susp_log_level, "%s null service " | |
2929 | "ptr", __func__); | |
2930 | ret = VCHIQ_ERROR; | |
2931 | goto out; | |
2932 | } | |
2933 | ||
2934 | write_lock_bh(&arm_state->susp_res_lock); | |
2935 | while (arm_state->resume_blocked) { | |
2936 | /* If we call 'use' while force suspend is waiting for suspend, | |
2937 | * then we're about to block the thread which the force is | |
2938 | * waiting to complete, so we're bound to just time out. In this | |
2939 | * case, set the suspend state such that the wait will be | |
2940 | * canceled, so we can complete as quickly as possible. */ | |
2941 | if (arm_state->resume_blocked && arm_state->vc_suspend_state == | |
2942 | VC_SUSPEND_IDLE) { | |
2943 | set_suspend_state(arm_state, VC_SUSPEND_FORCE_CANCELED); | |
2944 | break; | |
2945 | } | |
2946 | /* If suspend is already in progress then we need to block */ | |
2947 | if (!try_wait_for_completion(&arm_state->resume_blocker)) { | |
2948 | /* Indicate that there are threads waiting on the resume | |
2949 | * blocker. These need to be allowed to complete before | |
2950 | * a _second_ call to force suspend can complete, | |
2951 | * otherwise low priority threads might never actually | |
2952 | * continue */ | |
2953 | arm_state->blocked_count++; | |
2954 | write_unlock_bh(&arm_state->susp_res_lock); | |
2955 | vchiq_log_info(vchiq_susp_log_level, "%s %s resume " | |
2956 | "blocked - waiting...", __func__, entity); | |
2957 | if (wait_for_completion_killable( | |
2958 | &arm_state->resume_blocker) != 0) { | |
2959 | vchiq_log_error(vchiq_susp_log_level, "%s %s " | |
2960 | "wait for resume blocker interrupted", | |
2961 | __func__, entity); | |
2962 | ret = VCHIQ_ERROR; | |
2963 | write_lock_bh(&arm_state->susp_res_lock); | |
2964 | arm_state->blocked_count--; | |
2965 | write_unlock_bh(&arm_state->susp_res_lock); | |
2966 | goto out; | |
2967 | } | |
2968 | vchiq_log_info(vchiq_susp_log_level, "%s %s resume " | |
2969 | "unblocked", __func__, entity); | |
2970 | write_lock_bh(&arm_state->susp_res_lock); | |
2971 | if (--arm_state->blocked_count == 0) | |
2972 | complete_all(&arm_state->blocked_blocker); | |
2973 | } | |
2974 | } | |
2975 | ||
2976 | stop_suspend_timer(arm_state); | |
2977 | ||
2978 | local_uc = ++arm_state->videocore_use_count; | |
2979 | local_entity_uc = ++(*entity_uc); | |
2980 | ||
2981 | /* If there's a pending request which hasn't yet been serviced then | |
2982 | * just clear it. If we're past VC_SUSPEND_REQUESTED state then | |
2983 | * vc_resume_complete will block until we either resume or fail to | |
2984 | * suspend */ | |
2985 | if (arm_state->vc_suspend_state <= VC_SUSPEND_REQUESTED) | |
2986 | set_suspend_state(arm_state, VC_SUSPEND_IDLE); | |
2987 | ||
2988 | if ((use_type != USE_TYPE_SERVICE_NO_RESUME) && need_resume(state)) { | |
2989 | set_resume_state(arm_state, VC_RESUME_REQUESTED); | |
2990 | vchiq_log_info(vchiq_susp_log_level, | |
2991 | "%s %s count %d, state count %d", | |
2992 | __func__, entity, local_entity_uc, local_uc); | |
2993 | request_poll(state, NULL, 0); | |
2994 | } else | |
2995 | vchiq_log_trace(vchiq_susp_log_level, | |
2996 | "%s %s count %d, state count %d", | |
2997 | __func__, entity, *entity_uc, local_uc); | |
2998 | ||
2999 | ||
3000 | write_unlock_bh(&arm_state->susp_res_lock); | |
3001 | ||
3002 | /* Completion is in a done state when we're not suspended, so this won't | |
3003 | * block for the non-suspended case. */ | |
3004 | if (!try_wait_for_completion(&arm_state->vc_resume_complete)) { | |
3005 | vchiq_log_info(vchiq_susp_log_level, "%s %s wait for resume", | |
3006 | __func__, entity); | |
3007 | if (wait_for_completion_killable( | |
3008 | &arm_state->vc_resume_complete) != 0) { | |
3009 | vchiq_log_error(vchiq_susp_log_level, "%s %s wait for " | |
3010 | "resume interrupted", __func__, entity); | |
3011 | ret = VCHIQ_ERROR; | |
3012 | goto out; | |
3013 | } | |
3014 | vchiq_log_info(vchiq_susp_log_level, "%s %s resumed", __func__, | |
3015 | entity); | |
3016 | } | |
3017 | ||
3018 | if (ret == VCHIQ_SUCCESS) { | |
3019 | VCHIQ_STATUS_T status = VCHIQ_SUCCESS; | |
3020 | long ack_cnt = atomic_xchg(&arm_state->ka_use_ack_count, 0); | |
6e475350 | 3021 | |
71bad7f0 | 3022 | while (ack_cnt && (status == VCHIQ_SUCCESS)) { |
3023 | /* Send the use notify to videocore */ | |
3024 | status = vchiq_send_remote_use_active(state); | |
3025 | if (status == VCHIQ_SUCCESS) | |
3026 | ack_cnt--; | |
3027 | else | |
3028 | atomic_add(ack_cnt, | |
3029 | &arm_state->ka_use_ack_count); | |
3030 | } | |
3031 | } | |
3032 | ||
3033 | out: | |
3034 | vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret); | |
3035 | return ret; | |
3036 | } | |
3037 | ||
3038 | VCHIQ_STATUS_T | |
3039 | vchiq_release_internal(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service) | |
3040 | { | |
3041 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
3042 | VCHIQ_STATUS_T ret = VCHIQ_SUCCESS; | |
3043 | char entity[16]; | |
3044 | int *entity_uc; | |
3045 | int local_uc, local_entity_uc; | |
3046 | ||
3047 | if (!arm_state) | |
3048 | goto out; | |
3049 | ||
3050 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
3051 | ||
3052 | if (service) { | |
3053 | sprintf(entity, "%c%c%c%c:%03d", | |
3054 | VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc), | |
3055 | service->client_id); | |
3056 | entity_uc = &service->service_use_count; | |
3057 | } else { | |
3058 | sprintf(entity, "PEER: "); | |
3059 | entity_uc = &arm_state->peer_use_count; | |
3060 | } | |
3061 | ||
3062 | write_lock_bh(&arm_state->susp_res_lock); | |
3063 | if (!arm_state->videocore_use_count || !(*entity_uc)) { | |
3064 | /* Don't use BUG_ON - don't allow user thread to crash kernel */ | |
3065 | WARN_ON(!arm_state->videocore_use_count); | |
3066 | WARN_ON(!(*entity_uc)); | |
3067 | ret = VCHIQ_ERROR; | |
3068 | goto unlock; | |
3069 | } | |
3070 | local_uc = --arm_state->videocore_use_count; | |
3071 | local_entity_uc = --(*entity_uc); | |
3072 | ||
3073 | if (!vchiq_videocore_wanted(state)) { | |
3074 | if (vchiq_platform_use_suspend_timer() && | |
3075 | !arm_state->resume_blocked) { | |
3076 | /* Only use the timer if we're not trying to force | |
3077 | * suspend (=> resume_blocked) */ | |
3078 | start_suspend_timer(arm_state); | |
3079 | } else { | |
3080 | vchiq_log_info(vchiq_susp_log_level, | |
3081 | "%s %s count %d, state count %d - suspending", | |
3082 | __func__, entity, *entity_uc, | |
3083 | arm_state->videocore_use_count); | |
3084 | vchiq_arm_vcsuspend(state); | |
3085 | } | |
3086 | } else | |
3087 | vchiq_log_trace(vchiq_susp_log_level, | |
3088 | "%s %s count %d, state count %d", | |
3089 | __func__, entity, *entity_uc, | |
3090 | arm_state->videocore_use_count); | |
3091 | ||
3092 | unlock: | |
3093 | write_unlock_bh(&arm_state->susp_res_lock); | |
3094 | ||
3095 | out: | |
3096 | vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret); | |
3097 | return ret; | |
3098 | } | |
3099 | ||
3100 | void | |
3101 | vchiq_on_remote_use(VCHIQ_STATE_T *state) | |
3102 | { | |
3103 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
6e475350 | 3104 | |
71bad7f0 | 3105 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); |
3106 | atomic_inc(&arm_state->ka_use_count); | |
3107 | complete(&arm_state->ka_evt); | |
3108 | } | |
3109 | ||
3110 | void | |
3111 | vchiq_on_remote_release(VCHIQ_STATE_T *state) | |
3112 | { | |
3113 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
6e475350 | 3114 | |
71bad7f0 | 3115 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); |
3116 | atomic_inc(&arm_state->ka_release_count); | |
3117 | complete(&arm_state->ka_evt); | |
3118 | } | |
3119 | ||
3120 | VCHIQ_STATUS_T | |
3121 | vchiq_use_service_internal(VCHIQ_SERVICE_T *service) | |
3122 | { | |
3123 | return vchiq_use_internal(service->state, service, USE_TYPE_SERVICE); | |
3124 | } | |
3125 | ||
3126 | VCHIQ_STATUS_T | |
3127 | vchiq_release_service_internal(VCHIQ_SERVICE_T *service) | |
3128 | { | |
3129 | return vchiq_release_internal(service->state, service); | |
3130 | } | |
3131 | ||
3132 | VCHIQ_DEBUGFS_NODE_T * | |
3133 | vchiq_instance_get_debugfs_node(VCHIQ_INSTANCE_T instance) | |
3134 | { | |
3135 | return &instance->debugfs_node; | |
3136 | } | |
3137 | ||
3138 | int | |
3139 | vchiq_instance_get_use_count(VCHIQ_INSTANCE_T instance) | |
3140 | { | |
3141 | VCHIQ_SERVICE_T *service; | |
3142 | int use_count = 0, i; | |
6e475350 | 3143 | |
71bad7f0 | 3144 | i = 0; |
3145 | while ((service = next_service_by_instance(instance->state, | |
3146 | instance, &i)) != NULL) { | |
3147 | use_count += service->service_use_count; | |
3148 | unlock_service(service); | |
3149 | } | |
3150 | return use_count; | |
3151 | } | |
3152 | ||
3153 | int | |
3154 | vchiq_instance_get_pid(VCHIQ_INSTANCE_T instance) | |
3155 | { | |
3156 | return instance->pid; | |
3157 | } | |
3158 | ||
3159 | int | |
3160 | vchiq_instance_get_trace(VCHIQ_INSTANCE_T instance) | |
3161 | { | |
3162 | return instance->trace; | |
3163 | } | |
3164 | ||
3165 | void | |
3166 | vchiq_instance_set_trace(VCHIQ_INSTANCE_T instance, int trace) | |
3167 | { | |
3168 | VCHIQ_SERVICE_T *service; | |
3169 | int i; | |
6e475350 | 3170 | |
71bad7f0 | 3171 | i = 0; |
3172 | while ((service = next_service_by_instance(instance->state, | |
3173 | instance, &i)) != NULL) { | |
3174 | service->trace = trace; | |
3175 | unlock_service(service); | |
3176 | } | |
3177 | instance->trace = (trace != 0); | |
3178 | } | |
3179 | ||
3180 | static void suspend_timer_callback(unsigned long context) | |
3181 | { | |
3182 | VCHIQ_STATE_T *state = (VCHIQ_STATE_T *)context; | |
3183 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
6e475350 | 3184 | |
71bad7f0 | 3185 | if (!arm_state) |
3186 | goto out; | |
3187 | vchiq_log_info(vchiq_susp_log_level, | |
3188 | "%s - suspend timer expired - check suspend", __func__); | |
3189 | vchiq_check_suspend(state); | |
3190 | out: | |
3191 | return; | |
3192 | } | |
3193 | ||
3194 | VCHIQ_STATUS_T | |
3195 | vchiq_use_service_no_resume(VCHIQ_SERVICE_HANDLE_T handle) | |
3196 | { | |
3197 | VCHIQ_STATUS_T ret = VCHIQ_ERROR; | |
3198 | VCHIQ_SERVICE_T *service = find_service_by_handle(handle); | |
6e475350 | 3199 | |
71bad7f0 | 3200 | if (service) { |
3201 | ret = vchiq_use_internal(service->state, service, | |
3202 | USE_TYPE_SERVICE_NO_RESUME); | |
3203 | unlock_service(service); | |
3204 | } | |
3205 | return ret; | |
3206 | } | |
3207 | ||
3208 | VCHIQ_STATUS_T | |
3209 | vchiq_use_service(VCHIQ_SERVICE_HANDLE_T handle) | |
3210 | { | |
3211 | VCHIQ_STATUS_T ret = VCHIQ_ERROR; | |
3212 | VCHIQ_SERVICE_T *service = find_service_by_handle(handle); | |
6e475350 | 3213 | |
71bad7f0 | 3214 | if (service) { |
3215 | ret = vchiq_use_internal(service->state, service, | |
3216 | USE_TYPE_SERVICE); | |
3217 | unlock_service(service); | |
3218 | } | |
3219 | return ret; | |
3220 | } | |
3221 | ||
3222 | VCHIQ_STATUS_T | |
3223 | vchiq_release_service(VCHIQ_SERVICE_HANDLE_T handle) | |
3224 | { | |
3225 | VCHIQ_STATUS_T ret = VCHIQ_ERROR; | |
3226 | VCHIQ_SERVICE_T *service = find_service_by_handle(handle); | |
6e475350 | 3227 | |
71bad7f0 | 3228 | if (service) { |
3229 | ret = vchiq_release_internal(service->state, service); | |
3230 | unlock_service(service); | |
3231 | } | |
3232 | return ret; | |
3233 | } | |
3234 | ||
3235 | void | |
3236 | vchiq_dump_service_use_state(VCHIQ_STATE_T *state) | |
3237 | { | |
3238 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
3239 | int i, j = 0; | |
3240 | /* Only dump 64 services */ | |
3241 | static const int local_max_services = 64; | |
3242 | /* If there's more than 64 services, only dump ones with | |
3243 | * non-zero counts */ | |
3244 | int only_nonzero = 0; | |
3245 | static const char *nz = "<-- preventing suspend"; | |
3246 | ||
3247 | enum vc_suspend_status vc_suspend_state; | |
3248 | enum vc_resume_status vc_resume_state; | |
3249 | int peer_count; | |
3250 | int vc_use_count; | |
3251 | int active_services; | |
3252 | struct service_data_struct { | |
3253 | int fourcc; | |
3254 | int clientid; | |
3255 | int use_count; | |
3256 | } service_data[local_max_services]; | |
3257 | ||
3258 | if (!arm_state) | |
3259 | return; | |
3260 | ||
3261 | read_lock_bh(&arm_state->susp_res_lock); | |
3262 | vc_suspend_state = arm_state->vc_suspend_state; | |
3263 | vc_resume_state = arm_state->vc_resume_state; | |
3264 | peer_count = arm_state->peer_use_count; | |
3265 | vc_use_count = arm_state->videocore_use_count; | |
3266 | active_services = state->unused_service; | |
3267 | if (active_services > local_max_services) | |
3268 | only_nonzero = 1; | |
3269 | ||
3270 | for (i = 0; (i < active_services) && (j < local_max_services); i++) { | |
3271 | VCHIQ_SERVICE_T *service_ptr = state->services[i]; | |
6e475350 | 3272 | |
71bad7f0 | 3273 | if (!service_ptr) |
3274 | continue; | |
3275 | ||
3276 | if (only_nonzero && !service_ptr->service_use_count) | |
3277 | continue; | |
3278 | ||
b322396c SW |
3279 | if (service_ptr->srvstate == VCHIQ_SRVSTATE_FREE) |
3280 | continue; | |
3281 | ||
3282 | service_data[j].fourcc = service_ptr->base.fourcc; | |
3283 | service_data[j].clientid = service_ptr->client_id; | |
3284 | service_data[j++].use_count = service_ptr->service_use_count; | |
71bad7f0 | 3285 | } |
3286 | ||
3287 | read_unlock_bh(&arm_state->susp_res_lock); | |
3288 | ||
3289 | vchiq_log_warning(vchiq_susp_log_level, | |
3290 | "-- Videcore suspend state: %s --", | |
3291 | suspend_state_names[vc_suspend_state + VC_SUSPEND_NUM_OFFSET]); | |
3292 | vchiq_log_warning(vchiq_susp_log_level, | |
3293 | "-- Videcore resume state: %s --", | |
3294 | resume_state_names[vc_resume_state + VC_RESUME_NUM_OFFSET]); | |
3295 | ||
3296 | if (only_nonzero) | |
3297 | vchiq_log_warning(vchiq_susp_log_level, "Too many active " | |
3298 | "services (%d). Only dumping up to first %d services " | |
3299 | "with non-zero use-count", active_services, | |
3300 | local_max_services); | |
3301 | ||
3302 | for (i = 0; i < j; i++) { | |
3303 | vchiq_log_warning(vchiq_susp_log_level, | |
3304 | "----- %c%c%c%c:%d service count %d %s", | |
3305 | VCHIQ_FOURCC_AS_4CHARS(service_data[i].fourcc), | |
3306 | service_data[i].clientid, | |
3307 | service_data[i].use_count, | |
3308 | service_data[i].use_count ? nz : ""); | |
3309 | } | |
3310 | vchiq_log_warning(vchiq_susp_log_level, | |
3311 | "----- VCHIQ use count count %d", peer_count); | |
3312 | vchiq_log_warning(vchiq_susp_log_level, | |
3313 | "--- Overall vchiq instance use count %d", vc_use_count); | |
3314 | ||
3315 | vchiq_dump_platform_use_state(state); | |
3316 | } | |
3317 | ||
3318 | VCHIQ_STATUS_T | |
3319 | vchiq_check_service(VCHIQ_SERVICE_T *service) | |
3320 | { | |
3321 | VCHIQ_ARM_STATE_T *arm_state; | |
3322 | VCHIQ_STATUS_T ret = VCHIQ_ERROR; | |
3323 | ||
3324 | if (!service || !service->state) | |
3325 | goto out; | |
3326 | ||
3327 | vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); | |
3328 | ||
3329 | arm_state = vchiq_platform_get_arm_state(service->state); | |
3330 | ||
3331 | read_lock_bh(&arm_state->susp_res_lock); | |
3332 | if (service->service_use_count) | |
3333 | ret = VCHIQ_SUCCESS; | |
3334 | read_unlock_bh(&arm_state->susp_res_lock); | |
3335 | ||
3336 | if (ret == VCHIQ_ERROR) { | |
3337 | vchiq_log_error(vchiq_susp_log_level, | |
3338 | "%s ERROR - %c%c%c%c:%d service count %d, " | |
3339 | "state count %d, videocore suspend state %s", __func__, | |
3340 | VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc), | |
3341 | service->client_id, service->service_use_count, | |
3342 | arm_state->videocore_use_count, | |
3343 | suspend_state_names[arm_state->vc_suspend_state + | |
3344 | VC_SUSPEND_NUM_OFFSET]); | |
3345 | vchiq_dump_service_use_state(service->state); | |
3346 | } | |
3347 | out: | |
3348 | return ret; | |
3349 | } | |
3350 | ||
3351 | /* stub functions */ | |
3352 | void vchiq_on_remote_use_active(VCHIQ_STATE_T *state) | |
3353 | { | |
3354 | (void)state; | |
3355 | } | |
3356 | ||
3357 | void vchiq_platform_conn_state_changed(VCHIQ_STATE_T *state, | |
3358 | VCHIQ_CONNSTATE_T oldstate, VCHIQ_CONNSTATE_T newstate) | |
3359 | { | |
3360 | VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); | |
6e475350 | 3361 | |
71bad7f0 | 3362 | vchiq_log_info(vchiq_susp_log_level, "%d: %s->%s", state->id, |
3363 | get_conn_state_name(oldstate), get_conn_state_name(newstate)); | |
3364 | if (state->conn_state == VCHIQ_CONNSTATE_CONNECTED) { | |
3365 | write_lock_bh(&arm_state->susp_res_lock); | |
3366 | if (!arm_state->first_connect) { | |
698c4eba | 3367 | char threadname[16]; |
6e475350 | 3368 | |
71bad7f0 | 3369 | arm_state->first_connect = 1; |
3370 | write_unlock_bh(&arm_state->susp_res_lock); | |
698c4eba | 3371 | snprintf(threadname, sizeof(threadname), "vchiq-keep/%d", |
71bad7f0 | 3372 | state->id); |
3373 | arm_state->ka_thread = kthread_create( | |
3374 | &vchiq_keepalive_thread_func, | |
3375 | (void *)state, | |
3376 | threadname); | |
b04451d7 | 3377 | if (IS_ERR(arm_state->ka_thread)) { |
71bad7f0 | 3378 | vchiq_log_error(vchiq_susp_log_level, |
3379 | "vchiq: FATAL: couldn't create thread %s", | |
3380 | threadname); | |
3381 | } else { | |
3382 | wake_up_process(arm_state->ka_thread); | |
3383 | } | |
3384 | } else | |
3385 | write_unlock_bh(&arm_state->susp_res_lock); | |
3386 | } | |
3387 | } | |
3388 | ||
3389 | static int vchiq_probe(struct platform_device *pdev) | |
3390 | { | |
3391 | struct device_node *fw_node; | |
3392 | struct rpi_firmware *fw; | |
3393 | int err; | |
71bad7f0 | 3394 | |
3395 | fw_node = of_parse_phandle(pdev->dev.of_node, "firmware", 0); | |
71bad7f0 | 3396 | if (!fw_node) { |
3397 | dev_err(&pdev->dev, "Missing firmware node\n"); | |
3398 | return -ENOENT; | |
3399 | } | |
bea845af | 3400 | |
71bad7f0 | 3401 | fw = rpi_firmware_get(fw_node); |
d10543ec | 3402 | of_node_put(fw_node); |
71bad7f0 | 3403 | if (!fw) |
3404 | return -EPROBE_DEFER; | |
3405 | ||
3406 | platform_set_drvdata(pdev, fw); | |
3407 | ||
9224c15c | 3408 | err = vchiq_platform_init(pdev, &g_state); |
71bad7f0 | 3409 | if (err != 0) |
9224c15c | 3410 | goto failed_platform_init; |
71bad7f0 | 3411 | |
3412 | err = alloc_chrdev_region(&vchiq_devid, VCHIQ_MINOR, 1, DEVICE_NAME); | |
3413 | if (err != 0) { | |
3414 | vchiq_log_error(vchiq_arm_log_level, | |
3415 | "Unable to allocate device number"); | |
9224c15c | 3416 | goto failed_platform_init; |
71bad7f0 | 3417 | } |
3418 | cdev_init(&vchiq_cdev, &vchiq_fops); | |
3419 | vchiq_cdev.owner = THIS_MODULE; | |
3420 | err = cdev_add(&vchiq_cdev, vchiq_devid, 1); | |
3421 | if (err != 0) { | |
3422 | vchiq_log_error(vchiq_arm_log_level, | |
3423 | "Unable to register device"); | |
3424 | goto failed_cdev_add; | |
3425 | } | |
3426 | ||
3427 | /* create sysfs entries */ | |
3428 | vchiq_class = class_create(THIS_MODULE, DEVICE_NAME); | |
397fcd12 DC |
3429 | err = PTR_ERR(vchiq_class); |
3430 | if (IS_ERR(vchiq_class)) | |
71bad7f0 | 3431 | goto failed_class_create; |
3432 | ||
3433 | vchiq_dev = device_create(vchiq_class, NULL, | |
3434 | vchiq_devid, NULL, "vchiq"); | |
397fcd12 DC |
3435 | err = PTR_ERR(vchiq_dev); |
3436 | if (IS_ERR(vchiq_dev)) | |
71bad7f0 | 3437 | goto failed_device_create; |
3438 | ||
9224c15c SW |
3439 | /* create debugfs entries */ |
3440 | err = vchiq_debugfs_init(); | |
71bad7f0 | 3441 | if (err != 0) |
9224c15c | 3442 | goto failed_debugfs_init; |
71bad7f0 | 3443 | |
3444 | vchiq_log_info(vchiq_arm_log_level, | |
3445 | "vchiq: initialised - version %d (min %d), device %d.%d", | |
3446 | VCHIQ_VERSION, VCHIQ_VERSION_MIN, | |
3447 | MAJOR(vchiq_devid), MINOR(vchiq_devid)); | |
3448 | ||
3449 | return 0; | |
3450 | ||
9224c15c | 3451 | failed_debugfs_init: |
71bad7f0 | 3452 | device_destroy(vchiq_class, vchiq_devid); |
3453 | failed_device_create: | |
3454 | class_destroy(vchiq_class); | |
3455 | failed_class_create: | |
3456 | cdev_del(&vchiq_cdev); | |
71bad7f0 | 3457 | failed_cdev_add: |
3458 | unregister_chrdev_region(vchiq_devid, 1); | |
9224c15c | 3459 | failed_platform_init: |
71bad7f0 | 3460 | vchiq_log_warning(vchiq_arm_log_level, "could not load vchiq"); |
3461 | return err; | |
3462 | } | |
3463 | ||
3464 | static int vchiq_remove(struct platform_device *pdev) | |
3465 | { | |
0ece01c6 | 3466 | vchiq_debugfs_deinit(); |
71bad7f0 | 3467 | device_destroy(vchiq_class, vchiq_devid); |
3468 | class_destroy(vchiq_class); | |
3469 | cdev_del(&vchiq_cdev); | |
3470 | unregister_chrdev_region(vchiq_devid, 1); | |
3471 | ||
3472 | return 0; | |
3473 | } | |
3474 | ||
3475 | static const struct of_device_id vchiq_of_match[] = { | |
3476 | { .compatible = "brcm,bcm2835-vchiq", }, | |
3477 | {}, | |
3478 | }; | |
3479 | MODULE_DEVICE_TABLE(of, vchiq_of_match); | |
3480 | ||
3481 | static struct platform_driver vchiq_driver = { | |
3482 | .driver = { | |
3483 | .name = "bcm2835_vchiq", | |
71bad7f0 | 3484 | .of_match_table = vchiq_of_match, |
3485 | }, | |
3486 | .probe = vchiq_probe, | |
3487 | .remove = vchiq_remove, | |
3488 | }; | |
3489 | module_platform_driver(vchiq_driver); | |
3490 | ||
2ea91ce5 | 3491 | MODULE_LICENSE("Dual BSD/GPL"); |
8f8a3402 | 3492 | MODULE_DESCRIPTION("Videocore VCHIQ driver"); |
71bad7f0 | 3493 | MODULE_AUTHOR("Broadcom Corporation"); |