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sys/contrib/vchiq/interface/vchiq_arm/vchiq_arm.c
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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 36 #include "vchiq_core.h" 37 #include "vchiq_ioctl.h" 38 #include "vchiq_arm.h" 39 40 #define DEVICE_NAME "vchiq" 41 42 /* Override the default prefix, which would be vchiq_arm (from the filename) */ 43 #undef MODULE_PARAM_PREFIX 44 #define MODULE_PARAM_PREFIX DEVICE_NAME "." 45 46 #define VCHIQ_MINOR 0 47 48 /* Some per-instance constants */ 49 #define MAX_COMPLETIONS 128 50 #define MAX_SERVICES 64 51 #define MAX_ELEMENTS 8 52 #define MSG_QUEUE_SIZE 128 53 54 #define KEEPALIVE_VER 1 55 #define KEEPALIVE_VER_MIN KEEPALIVE_VER 56 57 /* Run time control of log level, based on KERN_XXX level. */ 58 int vchiq_arm_log_level = VCHIQ_LOG_DEFAULT; 59 int vchiq_susp_log_level = VCHIQ_LOG_ERROR; 60 61 #define SUSPEND_TIMER_TIMEOUT_MS 100 62 #define SUSPEND_RETRY_TIMER_TIMEOUT_MS 1000 63 64 #define VC_SUSPEND_NUM_OFFSET 3 /* number of values before idle which are -ve */ 65 static const char *const suspend_state_names[] = { 66 "VC_SUSPEND_FORCE_CANCELED", 67 "VC_SUSPEND_REJECTED", 68 "VC_SUSPEND_FAILED", 69 "VC_SUSPEND_IDLE", 70 "VC_SUSPEND_REQUESTED", 71 "VC_SUSPEND_IN_PROGRESS", 72 "VC_SUSPEND_SUSPENDED" 73 }; 74 #define VC_RESUME_NUM_OFFSET 1 /* number of values before idle which are -ve */ 75 static const char *const resume_state_names[] = { 76 "VC_RESUME_FAILED", 77 "VC_RESUME_IDLE", 78 "VC_RESUME_REQUESTED", 79 "VC_RESUME_IN_PROGRESS", 80 "VC_RESUME_RESUMED" 81 }; 82 /* The number of times we allow force suspend to timeout before actually 83 ** _forcing_ suspend. This is to cater for SW which fails to release vchiq 84 ** correctly - we don't want to prevent ARM suspend indefinitely in this case. 85 */ 86 #define FORCE_SUSPEND_FAIL_MAX 8 87 88 /* The time in ms allowed for videocore to go idle when force suspend has been 89 * requested */ 90 #define FORCE_SUSPEND_TIMEOUT_MS 200 91 92 93 static void suspend_timer_callback(unsigned long context); 94 #ifdef notyet 95 static int vchiq_proc_add_instance(VCHIQ_INSTANCE_T instance); 96 static void vchiq_proc_remove_instance(VCHIQ_INSTANCE_T instance); 97 #endif 98 99 100 typedef struct user_service_struct { 101 VCHIQ_SERVICE_T *service; 102 void *userdata; 103 VCHIQ_INSTANCE_T instance; 104 char is_vchi; 105 char dequeue_pending; 106 char close_pending; 107 int message_available_pos; 108 int msg_insert; 109 int msg_remove; 110 struct semaphore insert_event; 111 struct semaphore remove_event; 112 struct semaphore close_event; 113 VCHIQ_HEADER_T * msg_queue[MSG_QUEUE_SIZE]; 114 } USER_SERVICE_T; 115 116 struct bulk_waiter_node { 117 struct bulk_waiter bulk_waiter; 118 int pid; 119 struct list_head list; 120 }; 121 122 struct vchiq_instance_struct { 123 VCHIQ_STATE_T *state; 124 VCHIQ_COMPLETION_DATA_T completions[MAX_COMPLETIONS]; 125 int completion_insert; 126 int completion_remove; 127 struct semaphore insert_event; 128 struct semaphore remove_event; 129 struct mutex completion_mutex; 130 131 int connected; 132 int closing; 133 int pid; 134 int mark; 135 int use_close_delivered; 136 int trace; 137 138 struct list_head bulk_waiter_list; 139 struct mutex bulk_waiter_list_mutex; 140 141 #ifdef notyet 142 VCHIQ_DEBUGFS_NODE_T proc_entry; 143 #endif 144 }; 145 146 typedef struct dump_context_struct { 147 char __user *buf; 148 size_t actual; 149 size_t space; 150 loff_t offset; 151 } DUMP_CONTEXT_T; 152 153 static struct cdev * vchiq_cdev; 154 VCHIQ_STATE_T g_state; 155 static DEFINE_SPINLOCK(msg_queue_spinlock); 156 157 static const char *const ioctl_names[] = { 158 "CONNECT", 159 "SHUTDOWN", 160 "CREATE_SERVICE", 161 "REMOVE_SERVICE", 162 "QUEUE_MESSAGE", 163 "QUEUE_BULK_TRANSMIT", 164 "QUEUE_BULK_RECEIVE", 165 "AWAIT_COMPLETION", 166 "DEQUEUE_MESSAGE", 167 "GET_CLIENT_ID", 168 "GET_CONFIG", 169 "CLOSE_SERVICE", 170 "USE_SERVICE", 171 "RELEASE_SERVICE", 172 "SET_SERVICE_OPTION", 173 "DUMP_PHYS_MEM", 174 "LIB_VERSION", 175 "CLOSE_DELIVERED" 176 }; 177 178 vchiq_static_assert((sizeof(ioctl_names)/sizeof(ioctl_names[0])) == 179 (VCHIQ_IOC_MAX + 1)); 180 181 static d_open_t vchiq_open; 182 static d_close_t vchiq_close; 183 static d_ioctl_t vchiq_ioctl; 184 185 static struct cdevsw vchiq_cdevsw = { 186 .d_version = D_VERSION, 187 .d_ioctl = vchiq_ioctl, 188 .d_open = vchiq_open, 189 .d_close = vchiq_close, 190 .d_name = DEVICE_NAME, 191 }; 192 193 #if 0 194 static void 195 dump_phys_mem(void *virt_addr, uint32_t num_bytes); 196 #endif 197 198 /**************************************************************************** 199 * 200 * add_completion 201 * 202 ***************************************************************************/ 203 204 static VCHIQ_STATUS_T 205 add_completion(VCHIQ_INSTANCE_T instance, VCHIQ_REASON_T reason, 206 VCHIQ_HEADER_T *header, USER_SERVICE_T *user_service, 207 void *bulk_userdata) 208 { 209 VCHIQ_COMPLETION_DATA_T *completion; 210 int insert; 211 DEBUG_INITIALISE(g_state.local) 212 213 insert = instance->completion_insert; 214 while ((insert - instance->completion_remove) >= MAX_COMPLETIONS) { 215 /* Out of space - wait for the client */ 216 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 217 vchiq_log_trace(vchiq_arm_log_level, 218 "add_completion - completion queue full"); 219 DEBUG_COUNT(COMPLETION_QUEUE_FULL_COUNT); 220 221 if (down_interruptible(&instance->remove_event) != 0) { 222 vchiq_log_info(vchiq_arm_log_level, 223 "service_callback interrupted"); 224 return VCHIQ_RETRY; 225 } 226 227 if (instance->closing) { 228 vchiq_log_info(vchiq_arm_log_level, 229 "service_callback closing"); 230 return VCHIQ_SUCCESS; 231 } 232 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 233 } 234 235 completion = &instance->completions[insert & (MAX_COMPLETIONS - 1)]; 236 237 completion->header = header; 238 completion->reason = reason; 239 /* N.B. service_userdata is updated while processing AWAIT_COMPLETION */ 240 completion->service_userdata = user_service->service; 241 completion->bulk_userdata = bulk_userdata; 242 243 if (reason == VCHIQ_SERVICE_CLOSED) { 244 /* Take an extra reference, to be held until 245 this CLOSED notification is delivered. */ 246 lock_service(user_service->service); 247 if (instance->use_close_delivered) 248 user_service->close_pending = 1; 249 } 250 251 /* A write barrier is needed here to ensure that the entire completion 252 record is written out before the insert point. */ 253 wmb(); 254 255 if (reason == VCHIQ_MESSAGE_AVAILABLE) 256 user_service->message_available_pos = insert; 257 258 instance->completion_insert = ++insert; 259 260 up(&instance->insert_event); 261 262 return VCHIQ_SUCCESS; 263 } 264 265 /**************************************************************************** 266 * 267 * service_callback 268 * 269 ***************************************************************************/ 270 271 static VCHIQ_STATUS_T 272 service_callback(VCHIQ_REASON_T reason, VCHIQ_HEADER_T *header, 273 VCHIQ_SERVICE_HANDLE_T handle, void *bulk_userdata) 274 { 275 /* How do we ensure the callback goes to the right client? 276 ** The service_user data points to a USER_SERVICE_T record containing 277 ** the original callback and the user state structure, which contains a 278 ** circular buffer for completion records. 279 */ 280 USER_SERVICE_T *user_service; 281 VCHIQ_SERVICE_T *service; 282 VCHIQ_INSTANCE_T instance; 283 int skip_completion = 0; 284 DEBUG_INITIALISE(g_state.local) 285 286 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 287 288 service = handle_to_service(handle); 289 BUG_ON(!service); 290 user_service = (USER_SERVICE_T *)service->base.userdata; 291 instance = user_service->instance; 292 293 if (!instance || instance->closing) 294 return VCHIQ_SUCCESS; 295 296 vchiq_log_trace(vchiq_arm_log_level, 297 "service_callback - service %lx(%d,%p), reason %d, header %lx, " 298 "instance %lx, bulk_userdata %lx", 299 (unsigned long)user_service, 300 service->localport, user_service->userdata, 301 reason, (unsigned long)header, 302 (unsigned long)instance, (unsigned long)bulk_userdata); 303 304 if (header && user_service->is_vchi) { 305 spin_lock(&msg_queue_spinlock); 306 while (user_service->msg_insert == 307 (user_service->msg_remove + MSG_QUEUE_SIZE)) { 308 spin_unlock(&msg_queue_spinlock); 309 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 310 DEBUG_COUNT(MSG_QUEUE_FULL_COUNT); 311 vchiq_log_trace(vchiq_arm_log_level, 312 "service_callback - msg queue full"); 313 /* If there is no MESSAGE_AVAILABLE in the completion 314 ** queue, add one 315 */ 316 if ((user_service->message_available_pos - 317 instance->completion_remove) < 0) { 318 VCHIQ_STATUS_T status; 319 vchiq_log_info(vchiq_arm_log_level, 320 "Inserting extra MESSAGE_AVAILABLE"); 321 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 322 status = add_completion(instance, reason, 323 NULL, user_service, bulk_userdata); 324 if (status != VCHIQ_SUCCESS) { 325 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 326 return status; 327 } 328 } 329 330 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 331 if (down_interruptible(&user_service->remove_event) 332 != 0) { 333 vchiq_log_info(vchiq_arm_log_level, 334 "service_callback interrupted"); 335 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 336 return VCHIQ_RETRY; 337 } else if (instance->closing) { 338 vchiq_log_info(vchiq_arm_log_level, 339 "service_callback closing"); 340 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 341 return VCHIQ_ERROR; 342 } 343 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 344 spin_lock(&msg_queue_spinlock); 345 } 346 347 user_service->msg_queue[user_service->msg_insert & 348 (MSG_QUEUE_SIZE - 1)] = header; 349 user_service->msg_insert++; 350 351 /* If there is a thread waiting in DEQUEUE_MESSAGE, or if 352 ** there is a MESSAGE_AVAILABLE in the completion queue then 353 ** bypass the completion queue. 354 */ 355 if (((user_service->message_available_pos - 356 instance->completion_remove) >= 0) || 357 user_service->dequeue_pending) { 358 user_service->dequeue_pending = 0; 359 skip_completion = 1; 360 } 361 362 spin_unlock(&msg_queue_spinlock); 363 364 up(&user_service->insert_event); 365 366 header = NULL; 367 } 368 369 if (skip_completion) { 370 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 371 return VCHIQ_SUCCESS; 372 } 373 374 DEBUG_TRACE(SERVICE_CALLBACK_LINE); 375 376 return add_completion(instance, reason, header, user_service, 377 bulk_userdata); 378 } 379 380 /**************************************************************************** 381 * 382 * user_service_free 383 * 384 ***************************************************************************/ 385 static void 386 user_service_free(void *userdata) 387 { 388 USER_SERVICE_T *user_service = userdata; 389 390 _sema_destroy(&user_service->insert_event); 391 _sema_destroy(&user_service->remove_event); 392 393 kfree(user_service); 394 } 395 396 /**************************************************************************** 397 * 398 * close_delivered 399 * 400 ***************************************************************************/ 401 static void close_delivered(USER_SERVICE_T *user_service) 402 { 403 vchiq_log_info(vchiq_arm_log_level, 404 "close_delivered(handle=%x)", 405 user_service->service->handle); 406 407 if (user_service->close_pending) { 408 /* Allow the underlying service to be culled */ 409 unlock_service(user_service->service); 410 411 /* Wake the user-thread blocked in close_ or remove_service */ 412 up(&user_service->close_event); 413 414 user_service->close_pending = 0; 415 } 416 } 417 418 /**************************************************************************** 419 * 420 * vchiq_ioctl 421 * 422 ***************************************************************************/ 423 424 static int 425 vchiq_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int fflag, 426 struct thread *td) 427 { 428 VCHIQ_INSTANCE_T instance; 429 VCHIQ_STATUS_T status = VCHIQ_SUCCESS; 430 VCHIQ_SERVICE_T *service = NULL; 431 int ret = 0; 432 int i, rc; 433 DEBUG_INITIALISE(g_state.local) 434 435 if ((ret = devfs_get_cdevpriv((void**)&instance))) { 436 printf("vchiq_ioctl: devfs_get_cdevpriv failed: error %d\n", ret); 437 return (ret); 438 } 439 440 /* XXXBSD: HACK! */ 441 #define _IOC_NR(x) ((x) & 0xff) 442 #define _IOC_TYPE(x) IOCGROUP(x) 443 444 vchiq_log_trace(vchiq_arm_log_level, 445 "vchiq_ioctl - instance %x, cmd %s, arg %p", 446 (unsigned int)instance, 447 ((_IOC_TYPE(cmd) == VCHIQ_IOC_MAGIC) && 448 (_IOC_NR(cmd) <= VCHIQ_IOC_MAX)) ? 449 ioctl_names[_IOC_NR(cmd)] : "<invalid>", arg); 450 451 switch (cmd) { 452 case VCHIQ_IOC_SHUTDOWN: 453 if (!instance->connected) 454 break; 455 456 /* Remove all services */ 457 i = 0; 458 while ((service = next_service_by_instance(instance->state, 459 instance, &i)) != NULL) { 460 status = vchiq_remove_service(service->handle); 461 unlock_service(service); 462 if (status != VCHIQ_SUCCESS) 463 break; 464 } 465 service = NULL; 466 467 if (status == VCHIQ_SUCCESS) { 468 /* Wake the completion thread and ask it to exit */ 469 instance->closing = 1; 470 up(&instance->insert_event); 471 } 472 473 break; 474 475 case VCHIQ_IOC_CONNECT: 476 if (instance->connected) { 477 ret = -EINVAL; 478 break; 479 } 480 rc = lmutex_lock_interruptible(&instance->state->mutex); 481 if (rc != 0) { 482 vchiq_log_error(vchiq_arm_log_level, 483 "vchiq: connect: could not lock mutex for " 484 "state %d: %d", 485 instance->state->id, rc); 486 ret = -EINTR; 487 break; 488 } 489 status = vchiq_connect_internal(instance->state, instance); 490 lmutex_unlock(&instance->state->mutex); 491 492 if (status == VCHIQ_SUCCESS) 493 instance->connected = 1; 494 else 495 vchiq_log_error(vchiq_arm_log_level, 496 "vchiq: could not connect: %d", status); 497 break; 498 499 case VCHIQ_IOC_CREATE_SERVICE: { 500 VCHIQ_CREATE_SERVICE_T args; 501 USER_SERVICE_T *user_service = NULL; 502 void *userdata; 503 int srvstate; 504 505 memcpy(&args, (const void*)arg, sizeof(args)); 506 507 user_service = kmalloc(sizeof(USER_SERVICE_T), GFP_KERNEL); 508 if (!user_service) { 509 ret = -ENOMEM; 510 break; 511 } 512 513 if (args.is_open) { 514 if (!instance->connected) { 515 ret = -ENOTCONN; 516 kfree(user_service); 517 break; 518 } 519 srvstate = VCHIQ_SRVSTATE_OPENING; 520 } else { 521 srvstate = 522 instance->connected ? 523 VCHIQ_SRVSTATE_LISTENING : 524 VCHIQ_SRVSTATE_HIDDEN; 525 } 526 527 userdata = args.params.userdata; 528 args.params.callback = service_callback; 529 args.params.userdata = user_service; 530 service = vchiq_add_service_internal( 531 instance->state, 532 &args.params, srvstate, 533 instance, user_service_free); 534 535 if (service != NULL) { 536 user_service->service = service; 537 user_service->userdata = userdata; 538 user_service->instance = instance; 539 user_service->is_vchi = (args.is_vchi != 0); 540 user_service->dequeue_pending = 0; 541 user_service->close_pending = 0; 542 user_service->message_available_pos = 543 instance->completion_remove - 1; 544 user_service->msg_insert = 0; 545 user_service->msg_remove = 0; 546 _sema_init(&user_service->insert_event, 0); 547 _sema_init(&user_service->remove_event, 0); 548 _sema_init(&user_service->close_event, 0); 549 550 if (args.is_open) { 551 status = vchiq_open_service_internal 552 (service, instance->pid); 553 if (status != VCHIQ_SUCCESS) { 554 vchiq_remove_service(service->handle); 555 service = NULL; 556 ret = (status == VCHIQ_RETRY) ? 557 -EINTR : -EIO; 558 break; 559 } 560 } 561 562 #ifdef VCHIQ_IOCTL_DEBUG 563 printf("%s: [CREATE SERVICE] handle = %08x\n", __func__, service->handle); 564 #endif 565 memcpy((void *) 566 &(((VCHIQ_CREATE_SERVICE_T*) 567 arg)->handle), 568 (const void *)&service->handle, 569 sizeof(service->handle)); 570 571 service = NULL; 572 } else { 573 ret = -EEXIST; 574 kfree(user_service); 575 } 576 } break; 577 578 case VCHIQ_IOC_CLOSE_SERVICE: { 579 VCHIQ_SERVICE_HANDLE_T handle; 580 581 memcpy(&handle, (const void*)arg, sizeof(handle)); 582 583 #ifdef VCHIQ_IOCTL_DEBUG 584 printf("%s: [CLOSE SERVICE] handle = %08x\n", __func__, handle); 585 #endif 586 587 service = find_service_for_instance(instance, handle); 588 if (service != NULL) { 589 USER_SERVICE_T *user_service = 590 (USER_SERVICE_T *)service->base.userdata; 591 /* close_pending is false on first entry, and when the 592 wait in vchiq_close_service has been interrupted. */ 593 if (!user_service->close_pending) { 594 status = vchiq_close_service(service->handle); 595 if (status != VCHIQ_SUCCESS) 596 break; 597 } 598 599 /* close_pending is true once the underlying service 600 has been closed until the client library calls the 601 CLOSE_DELIVERED ioctl, signalling close_event. */ 602 if (user_service->close_pending && 603 down_interruptible(&user_service->close_event)) 604 status = VCHIQ_RETRY; 605 } 606 else 607 ret = -EINVAL; 608 } break; 609 610 case VCHIQ_IOC_REMOVE_SERVICE: { 611 VCHIQ_SERVICE_HANDLE_T handle; 612 613 memcpy(&handle, (const void*)arg, sizeof(handle)); 614 615 #ifdef VCHIQ_IOCTL_DEBUG 616 printf("%s: [REMOVE SERVICE] handle = %08x\n", __func__, handle); 617 #endif 618 619 service = find_service_for_instance(instance, handle); 620 if (service != NULL) { 621 USER_SERVICE_T *user_service = 622 (USER_SERVICE_T *)service->base.userdata; 623 /* close_pending is false on first entry, and when the 624 wait in vchiq_close_service has been interrupted. */ 625 if (!user_service->close_pending) { 626 status = vchiq_remove_service(service->handle); 627 if (status != VCHIQ_SUCCESS) 628 break; 629 } 630 631 /* close_pending is true once the underlying service 632 has been closed until the client library calls the 633 CLOSE_DELIVERED ioctl, signalling close_event. */ 634 if (user_service->close_pending && 635 down_interruptible(&user_service->close_event)) 636 status = VCHIQ_RETRY; 637 } 638 else 639 ret = -EINVAL; 640 } break; 641 642 case VCHIQ_IOC_USE_SERVICE: 643 case VCHIQ_IOC_RELEASE_SERVICE: { 644 VCHIQ_SERVICE_HANDLE_T handle; 645 646 memcpy(&handle, (const void*)arg, sizeof(handle)); 647 648 #ifdef VCHIQ_IOCTL_DEBUG 649 printf("%s: [%s SERVICE] handle = %08x\n", __func__, 650 cmd == VCHIQ_IOC_USE_SERVICE ? "USE" : "RELEASE", handle); 651 #endif 652 653 service = find_service_for_instance(instance, handle); 654 if (service != NULL) { 655 status = (cmd == VCHIQ_IOC_USE_SERVICE) ? 656 vchiq_use_service_internal(service) : 657 vchiq_release_service_internal(service); 658 if (status != VCHIQ_SUCCESS) { 659 vchiq_log_error(vchiq_susp_log_level, 660 "%s: cmd %s returned error %d for " 661 "service %c%c%c%c:%8x", 662 __func__, 663 (cmd == VCHIQ_IOC_USE_SERVICE) ? 664 "VCHIQ_IOC_USE_SERVICE" : 665 "VCHIQ_IOC_RELEASE_SERVICE", 666 status, 667 VCHIQ_FOURCC_AS_4CHARS( 668 service->base.fourcc), 669 service->client_id); 670 ret = -EINVAL; 671 } 672 } else 673 ret = -EINVAL; 674 } break; 675 676 case VCHIQ_IOC_QUEUE_MESSAGE: { 677 VCHIQ_QUEUE_MESSAGE_T args; 678 memcpy(&args, (const void*)arg, sizeof(args)); 679 680 #ifdef VCHIQ_IOCTL_DEBUG 681 printf("%s: [QUEUE MESSAGE] handle = %08x\n", __func__, args.handle); 682 #endif 683 684 service = find_service_for_instance(instance, args.handle); 685 686 if ((service != NULL) && (args.count <= MAX_ELEMENTS)) { 687 /* Copy elements into kernel space */ 688 VCHIQ_ELEMENT_T elements[MAX_ELEMENTS]; 689 if (copy_from_user(elements, args.elements, 690 args.count * sizeof(VCHIQ_ELEMENT_T)) == 0) 691 status = vchiq_queue_message 692 (args.handle, 693 elements, args.count); 694 else 695 ret = -EFAULT; 696 } else { 697 ret = -EINVAL; 698 } 699 } break; 700 701 case VCHIQ_IOC_QUEUE_BULK_TRANSMIT: 702 case VCHIQ_IOC_QUEUE_BULK_RECEIVE: { 703 VCHIQ_QUEUE_BULK_TRANSFER_T args; 704 struct bulk_waiter_node *waiter = NULL; 705 VCHIQ_BULK_DIR_T dir = 706 (cmd == VCHIQ_IOC_QUEUE_BULK_TRANSMIT) ? 707 VCHIQ_BULK_TRANSMIT : VCHIQ_BULK_RECEIVE; 708 709 memcpy(&args, (const void*)arg, sizeof(args)); 710 711 service = find_service_for_instance(instance, args.handle); 712 if (!service) { 713 ret = -EINVAL; 714 break; 715 } 716 717 if (args.mode == VCHIQ_BULK_MODE_BLOCKING) { 718 waiter = kzalloc(sizeof(struct bulk_waiter_node), 719 GFP_KERNEL); 720 if (!waiter) { 721 ret = -ENOMEM; 722 break; 723 } 724 args.userdata = &waiter->bulk_waiter; 725 } else if (args.mode == VCHIQ_BULK_MODE_WAITING) { 726 struct list_head *pos; 727 lmutex_lock(&instance->bulk_waiter_list_mutex); 728 list_for_each(pos, &instance->bulk_waiter_list) { 729 if (list_entry(pos, struct bulk_waiter_node, 730 list)->pid == current->p_pid) { 731 waiter = list_entry(pos, 732 struct bulk_waiter_node, 733 list); 734 list_del(pos); 735 break; 736 } 737 738 } 739 lmutex_unlock(&instance->bulk_waiter_list_mutex); 740 if (!waiter) { 741 vchiq_log_error(vchiq_arm_log_level, 742 "no bulk_waiter found for pid %d", 743 current->p_pid); 744 ret = -ESRCH; 745 break; 746 } 747 vchiq_log_info(vchiq_arm_log_level, 748 "found bulk_waiter %x for pid %d", 749 (unsigned int)waiter, current->p_pid); 750 args.userdata = &waiter->bulk_waiter; 751 } 752 status = vchiq_bulk_transfer 753 (args.handle, 754 VCHI_MEM_HANDLE_INVALID, 755 args.data, args.size, 756 args.userdata, args.mode, 757 dir); 758 if (!waiter) 759 break; 760 if ((status != VCHIQ_RETRY) || fatal_signal_pending(current) || 761 !waiter->bulk_waiter.bulk) { 762 if (waiter->bulk_waiter.bulk) { 763 /* Cancel the signal when the transfer 764 ** completes. */ 765 spin_lock(&bulk_waiter_spinlock); 766 waiter->bulk_waiter.bulk->userdata = NULL; 767 spin_unlock(&bulk_waiter_spinlock); 768 } 769 _sema_destroy(&waiter->bulk_waiter.event); 770 kfree(waiter); 771 } else { 772 const VCHIQ_BULK_MODE_T mode_waiting = 773 VCHIQ_BULK_MODE_WAITING; 774 waiter->pid = current->p_pid; 775 lmutex_lock(&instance->bulk_waiter_list_mutex); 776 list_add(&waiter->list, &instance->bulk_waiter_list); 777 lmutex_unlock(&instance->bulk_waiter_list_mutex); 778 vchiq_log_info(vchiq_arm_log_level, 779 "saved bulk_waiter %x for pid %d", 780 (unsigned int)waiter, current->p_pid); 781 782 memcpy((void *) 783 &(((VCHIQ_QUEUE_BULK_TRANSFER_T *) 784 arg)->mode), 785 (const void *)&mode_waiting, 786 sizeof(mode_waiting)); 787 } 788 } break; 789 790 case VCHIQ_IOC_AWAIT_COMPLETION: { 791 VCHIQ_AWAIT_COMPLETION_T args; 792 int count = 0; 793 794 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 795 if (!instance->connected) { 796 ret = -ENOTCONN; 797 break; 798 } 799 800 memcpy(&args, (const void*)arg, sizeof(args)); 801 802 lmutex_lock(&instance->completion_mutex); 803 804 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 805 while ((instance->completion_remove == 806 instance->completion_insert) 807 && !instance->closing) { 808 809 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 810 lmutex_unlock(&instance->completion_mutex); 811 rc = down_interruptible(&instance->insert_event); 812 lmutex_lock(&instance->completion_mutex); 813 if (rc != 0) { 814 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 815 vchiq_log_info(vchiq_arm_log_level, 816 "AWAIT_COMPLETION interrupted"); 817 ret = -EINTR; 818 break; 819 } 820 } 821 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 822 823 if (ret == 0) { 824 int msgbufcount = args.msgbufcount; 825 int remove; 826 827 remove = instance->completion_remove; 828 829 for (count = 0; count < args.count; count++) { 830 VCHIQ_COMPLETION_DATA_T *completion; 831 VCHIQ_SERVICE_T *service1; 832 USER_SERVICE_T *user_service; 833 VCHIQ_HEADER_T *header; 834 835 if (remove == instance->completion_insert) 836 break; 837 838 completion = &instance->completions[ 839 remove & (MAX_COMPLETIONS - 1)]; 840 841 842 /* A read memory barrier is needed to prevent 843 ** the prefetch of a stale completion record 844 */ 845 rmb(); 846 847 service1 = completion->service_userdata; 848 user_service = service1->base.userdata; 849 completion->service_userdata = 850 user_service->userdata; 851 852 header = completion->header; 853 if (header) { 854 void __user *msgbuf; 855 int msglen; 856 857 msglen = header->size + 858 sizeof(VCHIQ_HEADER_T); 859 /* This must be a VCHIQ-style service */ 860 if (args.msgbufsize < msglen) { 861 vchiq_log_error( 862 vchiq_arm_log_level, 863 "header %x: msgbufsize" 864 " %x < msglen %x", 865 (unsigned int)header, 866 args.msgbufsize, 867 msglen); 868 WARN(1, "invalid message " 869 "size\n"); 870 if (count == 0) 871 ret = -EMSGSIZE; 872 break; 873 } 874 if (msgbufcount <= 0) 875 /* Stall here for lack of a 876 ** buffer for the message. */ 877 break; 878 /* Get the pointer from user space */ 879 msgbufcount--; 880 if (copy_from_user(&msgbuf, 881 (const void __user *) 882 &args.msgbufs[msgbufcount], 883 sizeof(msgbuf)) != 0) { 884 if (count == 0) 885 ret = -EFAULT; 886 break; 887 } 888 889 /* Copy the message to user space */ 890 if (copy_to_user(msgbuf, header, 891 msglen) != 0) { 892 if (count == 0) 893 ret = -EFAULT; 894 break; 895 } 896 897 /* Now it has been copied, the message 898 ** can be released. */ 899 vchiq_release_message(service1->handle, 900 header); 901 902 /* The completion must point to the 903 ** msgbuf. */ 904 completion->header = msgbuf; 905 } 906 907 if ((completion->reason == 908 VCHIQ_SERVICE_CLOSED) && 909 !instance->use_close_delivered) 910 unlock_service(service1); 911 912 if (copy_to_user((void __user *)( 913 (size_t)args.buf + 914 count * sizeof(VCHIQ_COMPLETION_DATA_T)), 915 completion, 916 sizeof(VCHIQ_COMPLETION_DATA_T)) != 0) { 917 if (ret == 0) 918 ret = -EFAULT; 919 break; 920 } 921 922 /* Ensure that the above copy has completed 923 ** before advancing the remove pointer. */ 924 mb(); 925 926 instance->completion_remove = ++remove; 927 } 928 929 if (msgbufcount != args.msgbufcount) { 930 memcpy((void __user *) 931 &((VCHIQ_AWAIT_COMPLETION_T *)arg)-> 932 msgbufcount, 933 &msgbufcount, 934 sizeof(msgbufcount)); 935 } 936 937 if (count != args.count) 938 { 939 memcpy((void __user *) 940 &((VCHIQ_AWAIT_COMPLETION_T *)arg)->count, 941 &count, sizeof(count)); 942 } 943 } 944 945 if (count != 0) 946 up(&instance->remove_event); 947 948 if ((ret == 0) && instance->closing) 949 ret = -ENOTCONN; 950 /* 951 * XXXBSD: ioctl return codes are not negative as in linux, so 952 * we can not indicate success with positive number of passed 953 * messages 954 */ 955 if (ret > 0) 956 ret = 0; 957 958 lmutex_unlock(&instance->completion_mutex); 959 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 960 } break; 961 962 case VCHIQ_IOC_DEQUEUE_MESSAGE: { 963 VCHIQ_DEQUEUE_MESSAGE_T args; 964 USER_SERVICE_T *user_service; 965 VCHIQ_HEADER_T *header; 966 967 DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); 968 memcpy(&args, (const void*)arg, sizeof(args)); 969 service = find_service_for_instance(instance, args.handle); 970 if (!service) { 971 ret = -EINVAL; 972 break; 973 } 974 user_service = (USER_SERVICE_T *)service->base.userdata; 975 if (user_service->is_vchi == 0) { 976 ret = -EINVAL; 977 break; 978 } 979 980 spin_lock(&msg_queue_spinlock); 981 if (user_service->msg_remove == user_service->msg_insert) { 982 if (!args.blocking) { 983 spin_unlock(&msg_queue_spinlock); 984 DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); 985 ret = -EWOULDBLOCK; 986 break; 987 } 988 user_service->dequeue_pending = 1; 989 do { 990 spin_unlock(&msg_queue_spinlock); 991 DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); 992 if (down_interruptible( 993 &user_service->insert_event) != 0) { 994 vchiq_log_info(vchiq_arm_log_level, 995 "DEQUEUE_MESSAGE interrupted"); 996 ret = -EINTR; 997 break; 998 } 999 spin_lock(&msg_queue_spinlock); 1000 } while (user_service->msg_remove == 1001 user_service->msg_insert); 1002 1003 if (ret) 1004 break; 1005 } 1006 1007 BUG_ON((int)(user_service->msg_insert - 1008 user_service->msg_remove) < 0); 1009 1010 header = user_service->msg_queue[user_service->msg_remove & 1011 (MSG_QUEUE_SIZE - 1)]; 1012 user_service->msg_remove++; 1013 spin_unlock(&msg_queue_spinlock); 1014 1015 up(&user_service->remove_event); 1016 if (header == NULL) 1017 ret = -ENOTCONN; 1018 else if (header->size <= args.bufsize) { 1019 /* Copy to user space if msgbuf is not NULL */ 1020 if ((args.buf == NULL) || 1021 (copy_to_user((void __user *)args.buf, 1022 header->data, 1023 header->size) == 0)) { 1024 args.bufsize = header->size; 1025 memcpy((void *)arg, &args, 1026 sizeof(args)); 1027 vchiq_release_message( 1028 service->handle, 1029 header); 1030 } else 1031 ret = -EFAULT; 1032 } else { 1033 vchiq_log_error(vchiq_arm_log_level, 1034 "header %x: bufsize %x < size %x", 1035 (unsigned int)header, args.bufsize, 1036 header->size); 1037 WARN(1, "invalid size\n"); 1038 ret = -EMSGSIZE; 1039 } 1040 DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); 1041 } break; 1042 1043 case VCHIQ_IOC_GET_CLIENT_ID: { 1044 VCHIQ_SERVICE_HANDLE_T handle; 1045 1046 memcpy(&handle, (const void*)arg, sizeof(handle)); 1047 1048 ret = vchiq_get_client_id(handle); 1049 } break; 1050 1051 case VCHIQ_IOC_GET_CONFIG: { 1052 VCHIQ_GET_CONFIG_T args; 1053 VCHIQ_CONFIG_T config; 1054 1055 memcpy(&args, (const void*)arg, sizeof(args)); 1056 if (args.config_size > sizeof(config)) { 1057 ret = -EINVAL; 1058 break; 1059 } 1060 status = vchiq_get_config(instance, args.config_size, &config); 1061 if (status == VCHIQ_SUCCESS) { 1062 if (copy_to_user((void __user *)args.pconfig, 1063 &config, args.config_size) != 0) { 1064 ret = -EFAULT; 1065 break; 1066 } 1067 } 1068 } break; 1069 1070 case VCHIQ_IOC_SET_SERVICE_OPTION: { 1071 VCHIQ_SET_SERVICE_OPTION_T args; 1072 1073 memcpy(&args, (const void*)arg, sizeof(args)); 1074 1075 service = find_service_for_instance(instance, args.handle); 1076 if (!service) { 1077 ret = -EINVAL; 1078 break; 1079 } 1080 1081 status = vchiq_set_service_option( 1082 args.handle, args.option, args.value); 1083 } break; 1084 1085 case VCHIQ_IOC_DUMP_PHYS_MEM: { 1086 VCHIQ_DUMP_MEM_T args; 1087 1088 memcpy(&args, (const void*)arg, sizeof(args)); 1089 printf("IMPLEMENT ME: %s:%d\n", __FILE__, __LINE__); 1090 #if 0 1091 dump_phys_mem(args.virt_addr, args.num_bytes); 1092 #endif 1093 } break; 1094 1095 case VCHIQ_IOC_LIB_VERSION: { 1096 unsigned int lib_version = (unsigned int)arg; 1097 1098 if (lib_version < VCHIQ_VERSION_MIN) 1099 ret = -EINVAL; 1100 else if (lib_version >= VCHIQ_VERSION_CLOSE_DELIVERED) 1101 instance->use_close_delivered = 1; 1102 } break; 1103 1104 case VCHIQ_IOC_CLOSE_DELIVERED: { 1105 VCHIQ_SERVICE_HANDLE_T handle; 1106 memcpy(&handle, (const void*)arg, sizeof(handle)); 1107 1108 service = find_closed_service_for_instance(instance, handle); 1109 if (service != NULL) { 1110 USER_SERVICE_T *user_service = 1111 (USER_SERVICE_T *)service->base.userdata; 1112 close_delivered(user_service); 1113 } 1114 else 1115 ret = -EINVAL; 1116 } break; 1117 1118 default: 1119 ret = -ENOTTY; 1120 break; 1121 } 1122 1123 if (service) 1124 unlock_service(service); 1125 1126 if (ret == 0) { 1127 if (status == VCHIQ_ERROR) 1128 ret = -EIO; 1129 else if (status == VCHIQ_RETRY) 1130 ret = -EINTR; 1131 } 1132 1133 if ((status == VCHIQ_SUCCESS) && (ret < 0) && (ret != -EINTR) && 1134 (ret != -EWOULDBLOCK)) 1135 vchiq_log_info(vchiq_arm_log_level, 1136 " ioctl instance %lx, cmd %s -> status %d, %d", 1137 (unsigned long)instance, 1138 (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ? 1139 ioctl_names[_IOC_NR(cmd)] : 1140 "<invalid>", 1141 status, ret); 1142 else 1143 vchiq_log_trace(vchiq_arm_log_level, 1144 " ioctl instance %lx, cmd %s -> status %d, %d", 1145 (unsigned long)instance, 1146 (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ? 1147 ioctl_names[_IOC_NR(cmd)] : 1148 "<invalid>", 1149 status, ret); 1150 1151 /* XXXBSD: report BSD-style error to userland */ 1152 if (ret < 0) 1153 ret = -ret; 1154 1155 return ret; 1156 } 1157 1158 static void 1159 instance_dtr(void *data) 1160 { 1161 1162 kfree(data); 1163 } 1164 1165 /**************************************************************************** 1166 * 1167 * vchiq_open 1168 * 1169 ***************************************************************************/ 1170 1171 static int 1172 vchiq_open(struct cdev *dev, int flags, int fmt __unused, struct thread *td) 1173 { 1174 vchiq_log_info(vchiq_arm_log_level, "vchiq_open"); 1175 /* XXXBSD: do we really need this check? */ 1176 if (1) { 1177 VCHIQ_STATE_T *state = vchiq_get_state(); 1178 VCHIQ_INSTANCE_T instance; 1179 1180 if (!state) { 1181 vchiq_log_error(vchiq_arm_log_level, 1182 "vchiq has no connection to VideoCore"); 1183 return -ENOTCONN; 1184 } 1185 1186 instance = kmalloc(sizeof(*instance), GFP_KERNEL); 1187 if (!instance) 1188 return -ENOMEM; 1189 1190 instance->state = state; 1191 /* XXXBSD: PID or thread ID? */ 1192 instance->pid = td->td_proc->p_pid; 1193 1194 #ifdef notyet 1195 ret = vchiq_proc_add_instance(instance); 1196 if (ret != 0) { 1197 kfree(instance); 1198 return ret; 1199 } 1200 #endif 1201 1202 _sema_init(&instance->insert_event, 0); 1203 _sema_init(&instance->remove_event, 0); 1204 lmutex_init(&instance->completion_mutex); 1205 lmutex_init(&instance->bulk_waiter_list_mutex); 1206 INIT_LIST_HEAD(&instance->bulk_waiter_list); 1207 1208 devfs_set_cdevpriv(instance, instance_dtr); 1209 } 1210 else { 1211 vchiq_log_error(vchiq_arm_log_level, 1212 "Unknown minor device"); 1213 return -ENXIO; 1214 } 1215 1216 return 0; 1217 } 1218 1219 /**************************************************************************** 1220 * 1221 * vchiq_release 1222 * 1223 ***************************************************************************/ 1224 1225 static int 1226 vchiq_close(struct cdev *dev, int flags __unused, int fmt __unused, 1227 struct thread *td) 1228 { 1229 int ret = 0; 1230 if (1) { 1231 VCHIQ_INSTANCE_T instance; 1232 VCHIQ_STATE_T *state = vchiq_get_state(); 1233 VCHIQ_SERVICE_T *service; 1234 int i; 1235 1236 if ((ret = devfs_get_cdevpriv((void**)&instance))) { 1237 printf("devfs_get_cdevpriv failed: error %d\n", ret); 1238 return (ret); 1239 } 1240 1241 vchiq_log_info(vchiq_arm_log_level, 1242 "vchiq_release: instance=%lx", 1243 (unsigned long)instance); 1244 1245 if (!state) { 1246 ret = -EPERM; 1247 goto out; 1248 } 1249 1250 /* Ensure videocore is awake to allow termination. */ 1251 vchiq_use_internal(instance->state, NULL, 1252 USE_TYPE_VCHIQ); 1253 1254 lmutex_lock(&instance->completion_mutex); 1255 1256 /* Wake the completion thread and ask it to exit */ 1257 instance->closing = 1; 1258 up(&instance->insert_event); 1259 1260 lmutex_unlock(&instance->completion_mutex); 1261 1262 /* Wake the slot handler if the completion queue is full. */ 1263 up(&instance->remove_event); 1264 1265 /* Mark all services for termination... */ 1266 i = 0; 1267 while ((service = next_service_by_instance(state, instance, 1268 &i)) != NULL) { 1269 USER_SERVICE_T *user_service = service->base.userdata; 1270 1271 /* Wake the slot handler if the msg queue is full. */ 1272 up(&user_service->remove_event); 1273 1274 vchiq_terminate_service_internal(service); 1275 unlock_service(service); 1276 } 1277 1278 /* ...and wait for them to die */ 1279 i = 0; 1280 while ((service = next_service_by_instance(state, instance, &i)) 1281 != NULL) { 1282 USER_SERVICE_T *user_service = service->base.userdata; 1283 1284 down(&service->remove_event); 1285 1286 BUG_ON(service->srvstate != VCHIQ_SRVSTATE_FREE); 1287 1288 spin_lock(&msg_queue_spinlock); 1289 1290 while (user_service->msg_remove != 1291 user_service->msg_insert) { 1292 VCHIQ_HEADER_T *header = user_service-> 1293 msg_queue[user_service->msg_remove & 1294 (MSG_QUEUE_SIZE - 1)]; 1295 user_service->msg_remove++; 1296 spin_unlock(&msg_queue_spinlock); 1297 1298 if (header) 1299 vchiq_release_message( 1300 service->handle, 1301 header); 1302 spin_lock(&msg_queue_spinlock); 1303 } 1304 1305 spin_unlock(&msg_queue_spinlock); 1306 1307 unlock_service(service); 1308 } 1309 1310 /* Release any closed services */ 1311 while (instance->completion_remove != 1312 instance->completion_insert) { 1313 VCHIQ_COMPLETION_DATA_T *completion; 1314 VCHIQ_SERVICE_T *service1; 1315 completion = &instance->completions[ 1316 instance->completion_remove & 1317 (MAX_COMPLETIONS - 1)]; 1318 service1 = completion->service_userdata; 1319 if (completion->reason == VCHIQ_SERVICE_CLOSED) 1320 { 1321 USER_SERVICE_T *user_service = 1322 service->base.userdata; 1323 1324 /* Wake any blocked user-thread */ 1325 if (instance->use_close_delivered) 1326 up(&user_service->close_event); 1327 unlock_service(service1); 1328 } 1329 instance->completion_remove++; 1330 } 1331 1332 /* Release the PEER service count. */ 1333 vchiq_release_internal(instance->state, NULL); 1334 1335 { 1336 struct list_head *pos, *next; 1337 list_for_each_safe(pos, next, 1338 &instance->bulk_waiter_list) { 1339 struct bulk_waiter_node *waiter; 1340 waiter = list_entry(pos, 1341 struct bulk_waiter_node, 1342 list); 1343 list_del(pos); 1344 vchiq_log_info(vchiq_arm_log_level, 1345 "bulk_waiter - cleaned up %x " 1346 "for pid %d", 1347 (unsigned int)waiter, waiter->pid); 1348 _sema_destroy(&waiter->bulk_waiter.event); 1349 kfree(waiter); 1350 } 1351 } 1352 1353 } 1354 else { 1355 vchiq_log_error(vchiq_arm_log_level, 1356 "Unknown minor device"); 1357 ret = -ENXIO; 1358 } 1359 1360 out: 1361 return ret; 1362 } 1363 1364 /**************************************************************************** 1365 * 1366 * vchiq_dump 1367 * 1368 ***************************************************************************/ 1369 1370 void 1371 vchiq_dump(void *dump_context, const char *str, int len) 1372 { 1373 DUMP_CONTEXT_T *context = (DUMP_CONTEXT_T *)dump_context; 1374 1375 if (context->actual < context->space) { 1376 int copy_bytes; 1377 if (context->offset > 0) { 1378 int skip_bytes = min(len, (int)context->offset); 1379 str += skip_bytes; 1380 len -= skip_bytes; 1381 context->offset -= skip_bytes; 1382 if (context->offset > 0) 1383 return; 1384 } 1385 copy_bytes = min(len, (int)(context->space - context->actual)); 1386 if (copy_bytes == 0) 1387 return; 1388 memcpy(context->buf + context->actual, str, copy_bytes); 1389 context->actual += copy_bytes; 1390 len -= copy_bytes; 1391 1392 /* If tne terminating NUL is included in the length, then it 1393 ** marks the end of a line and should be replaced with a 1394 ** carriage return. */ 1395 if ((len == 0) && (str[copy_bytes - 1] == '\0')) { 1396 char cr = '\n'; 1397 memcpy(context->buf + context->actual - 1, &cr, 1); 1398 } 1399 } 1400 } 1401 1402 /**************************************************************************** 1403 * 1404 * vchiq_dump_platform_instance_state 1405 * 1406 ***************************************************************************/ 1407 1408 void 1409 vchiq_dump_platform_instances(void *dump_context) 1410 { 1411 VCHIQ_STATE_T *state = vchiq_get_state(); 1412 char buf[80]; 1413 int len; 1414 int i; 1415 1416 /* There is no list of instances, so instead scan all services, 1417 marking those that have been dumped. */ 1418 1419 for (i = 0; i < state->unused_service; i++) { 1420 VCHIQ_SERVICE_T *service = state->services[i]; 1421 VCHIQ_INSTANCE_T instance; 1422 1423 if (service && (service->base.callback == service_callback)) { 1424 instance = service->instance; 1425 if (instance) 1426 instance->mark = 0; 1427 } 1428 } 1429 1430 for (i = 0; i < state->unused_service; i++) { 1431 VCHIQ_SERVICE_T *service = state->services[i]; 1432 VCHIQ_INSTANCE_T instance; 1433 1434 if (service && (service->base.callback == service_callback)) { 1435 instance = service->instance; 1436 if (instance && !instance->mark) { 1437 len = snprintf(buf, sizeof(buf), 1438 "Instance %x: pid %d,%s completions " 1439 "%d/%d", 1440 (unsigned int)instance, instance->pid, 1441 instance->connected ? " connected, " : 1442 "", 1443 instance->completion_insert - 1444 instance->completion_remove, 1445 MAX_COMPLETIONS); 1446 1447 vchiq_dump(dump_context, buf, len + 1); 1448 1449 instance->mark = 1; 1450 } 1451 } 1452 } 1453 } 1454 1455 /**************************************************************************** 1456 * 1457 * vchiq_dump_platform_service_state 1458 * 1459 ***************************************************************************/ 1460 1461 void 1462 vchiq_dump_platform_service_state(void *dump_context, VCHIQ_SERVICE_T *service) 1463 { 1464 USER_SERVICE_T *user_service = (USER_SERVICE_T *)service->base.userdata; 1465 char buf[80]; 1466 int len; 1467 1468 len = snprintf(buf, sizeof(buf), " instance %x", 1469 (unsigned int)service->instance); 1470 1471 if ((service->base.callback == service_callback) && 1472 user_service->is_vchi) { 1473 len += snprintf(buf + len, sizeof(buf) - len, 1474 ", %d/%d messages", 1475 user_service->msg_insert - user_service->msg_remove, 1476 MSG_QUEUE_SIZE); 1477 1478 if (user_service->dequeue_pending) 1479 len += snprintf(buf + len, sizeof(buf) - len, 1480 " (dequeue pending)"); 1481 } 1482 1483 vchiq_dump(dump_context, buf, len + 1); 1484 } 1485 1486 #ifdef notyet 1487 /**************************************************************************** 1488 * 1489 * dump_user_mem 1490 * 1491 ***************************************************************************/ 1492 1493 static void 1494 dump_phys_mem(void *virt_addr, uint32_t num_bytes) 1495 { 1496 int rc; 1497 uint8_t *end_virt_addr = virt_addr + num_bytes; 1498 int num_pages; 1499 int offset; 1500 int end_offset; 1501 int page_idx; 1502 int prev_idx; 1503 struct page *page; 1504 struct page **pages; 1505 uint8_t *kmapped_virt_ptr; 1506 1507 /* Align virtAddr and endVirtAddr to 16 byte boundaries. */ 1508 1509 virt_addr = (void *)((unsigned long)virt_addr & ~0x0fuL); 1510 end_virt_addr = (void *)(((unsigned long)end_virt_addr + 15uL) & 1511 ~0x0fuL); 1512 1513 offset = (int)(long)virt_addr & (PAGE_SIZE - 1); 1514 end_offset = (int)(long)end_virt_addr & (PAGE_SIZE - 1); 1515 1516 num_pages = (offset + num_bytes + PAGE_SIZE - 1) / PAGE_SIZE; 1517 1518 pages = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); 1519 if (pages == NULL) { 1520 vchiq_log_error(vchiq_arm_log_level, 1521 "Unable to allocation memory for %d pages\n", 1522 num_pages); 1523 return; 1524 } 1525 1526 down_read(¤t->mm->mmap_sem); 1527 rc = get_user_pages(current, /* task */ 1528 current->mm, /* mm */ 1529 (unsigned long)virt_addr, /* start */ 1530 num_pages, /* len */ 1531 0, /* write */ 1532 0, /* force */ 1533 pages, /* pages (array of page pointers) */ 1534 NULL); /* vmas */ 1535 up_read(¤t->mm->mmap_sem); 1536 1537 prev_idx = -1; 1538 page = NULL; 1539 1540 while (offset < end_offset) { 1541 1542 int page_offset = offset % PAGE_SIZE; 1543 page_idx = offset / PAGE_SIZE; 1544 1545 if (page_idx != prev_idx) { 1546 1547 if (page != NULL) 1548 kunmap(page); 1549 page = pages[page_idx]; 1550 kmapped_virt_ptr = kmap(page); 1551 1552 prev_idx = page_idx; 1553 } 1554 1555 if (vchiq_arm_log_level >= VCHIQ_LOG_TRACE) 1556 vchiq_log_dump_mem("ph", 1557 (uint32_t)(unsigned long)&kmapped_virt_ptr[ 1558 page_offset], 1559 &kmapped_virt_ptr[page_offset], 16); 1560 1561 offset += 16; 1562 } 1563 if (page != NULL) 1564 kunmap(page); 1565 1566 for (page_idx = 0; page_idx < num_pages; page_idx++) 1567 page_cache_release(pages[page_idx]); 1568 1569 kfree(pages); 1570 } 1571 1572 /**************************************************************************** 1573 * 1574 * vchiq_read 1575 * 1576 ***************************************************************************/ 1577 1578 static ssize_t 1579 vchiq_read(struct file *file, char __user *buf, 1580 size_t count, loff_t *ppos) 1581 { 1582 DUMP_CONTEXT_T context; 1583 context.buf = buf; 1584 context.actual = 0; 1585 context.space = count; 1586 context.offset = *ppos; 1587 1588 vchiq_dump_state(&context, &g_state); 1589 1590 *ppos += context.actual; 1591 1592 return context.actual; 1593 } 1594 #endif 1595 1596 VCHIQ_STATE_T * 1597 vchiq_get_state(void) 1598 { 1599 1600 if (g_state.remote == NULL) 1601 printk(KERN_ERR "%s: g_state.remote == NULL\n", __func__); 1602 else if (g_state.remote->initialised != 1) 1603 printk(KERN_NOTICE "%s: g_state.remote->initialised != 1 (%d)\n", 1604 __func__, g_state.remote->initialised); 1605 1606 return ((g_state.remote != NULL) && 1607 (g_state.remote->initialised == 1)) ? &g_state : NULL; 1608 } 1609 1610 /* 1611 * Autosuspend related functionality 1612 */ 1613 1614 int 1615 vchiq_videocore_wanted(VCHIQ_STATE_T *state) 1616 { 1617 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 1618 if (!arm_state) 1619 /* autosuspend not supported - always return wanted */ 1620 return 1; 1621 else if (arm_state->blocked_count) 1622 return 1; 1623 else if (!arm_state->videocore_use_count) 1624 /* usage count zero - check for override unless we're forcing */ 1625 if (arm_state->resume_blocked) 1626 return 0; 1627 else 1628 return vchiq_platform_videocore_wanted(state); 1629 else 1630 /* non-zero usage count - videocore still required */ 1631 return 1; 1632 } 1633 1634 static VCHIQ_STATUS_T 1635 vchiq_keepalive_vchiq_callback(VCHIQ_REASON_T reason, 1636 VCHIQ_HEADER_T *header, 1637 VCHIQ_SERVICE_HANDLE_T service_user, 1638 void *bulk_user) 1639 { 1640 vchiq_log_error(vchiq_susp_log_level, 1641 "%s callback reason %d", __func__, reason); 1642 return 0; 1643 } 1644 1645 static int 1646 vchiq_keepalive_thread_func(void *v) 1647 { 1648 VCHIQ_STATE_T *state = (VCHIQ_STATE_T *) v; 1649 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 1650 1651 VCHIQ_STATUS_T status; 1652 VCHIQ_INSTANCE_T instance; 1653 VCHIQ_SERVICE_HANDLE_T ka_handle; 1654 1655 VCHIQ_SERVICE_PARAMS_T params = { 1656 .fourcc = VCHIQ_MAKE_FOURCC('K', 'E', 'E', 'P'), 1657 .callback = vchiq_keepalive_vchiq_callback, 1658 .version = KEEPALIVE_VER, 1659 .version_min = KEEPALIVE_VER_MIN 1660 }; 1661 1662 status = vchiq_initialise(&instance); 1663 if (status != VCHIQ_SUCCESS) { 1664 vchiq_log_error(vchiq_susp_log_level, 1665 "%s vchiq_initialise failed %d", __func__, status); 1666 goto exit; 1667 } 1668 1669 status = vchiq_connect(instance); 1670 if (status != VCHIQ_SUCCESS) { 1671 vchiq_log_error(vchiq_susp_log_level, 1672 "%s vchiq_connect failed %d", __func__, status); 1673 goto shutdown; 1674 } 1675 1676 status = vchiq_add_service(instance, ¶ms, &ka_handle); 1677 if (status != VCHIQ_SUCCESS) { 1678 vchiq_log_error(vchiq_susp_log_level, 1679 "%s vchiq_open_service failed %d", __func__, status); 1680 goto shutdown; 1681 } 1682 1683 while (1) { 1684 long rc = 0, uc = 0; 1685 if (wait_for_completion_interruptible(&arm_state->ka_evt) 1686 != 0) { 1687 vchiq_log_error(vchiq_susp_log_level, 1688 "%s interrupted", __func__); 1689 flush_signals(current); 1690 continue; 1691 } 1692 1693 /* read and clear counters. Do release_count then use_count to 1694 * prevent getting more releases than uses */ 1695 rc = atomic_xchg(&arm_state->ka_release_count, 0); 1696 uc = atomic_xchg(&arm_state->ka_use_count, 0); 1697 1698 /* Call use/release service the requisite number of times. 1699 * Process use before release so use counts don't go negative */ 1700 while (uc--) { 1701 atomic_inc(&arm_state->ka_use_ack_count); 1702 status = vchiq_use_service(ka_handle); 1703 if (status != VCHIQ_SUCCESS) { 1704 vchiq_log_error(vchiq_susp_log_level, 1705 "%s vchiq_use_service error %d", 1706 __func__, status); 1707 } 1708 } 1709 while (rc--) { 1710 status = vchiq_release_service(ka_handle); 1711 if (status != VCHIQ_SUCCESS) { 1712 vchiq_log_error(vchiq_susp_log_level, 1713 "%s vchiq_release_service error %d", 1714 __func__, status); 1715 } 1716 } 1717 } 1718 1719 shutdown: 1720 vchiq_shutdown(instance); 1721 exit: 1722 return 0; 1723 } 1724 1725 VCHIQ_STATUS_T 1726 vchiq_arm_init_state(VCHIQ_STATE_T *state, VCHIQ_ARM_STATE_T *arm_state) 1727 { 1728 VCHIQ_STATUS_T status = VCHIQ_SUCCESS; 1729 1730 if (arm_state) { 1731 rwlock_init(&arm_state->susp_res_lock); 1732 1733 init_completion(&arm_state->ka_evt); 1734 atomic_set(&arm_state->ka_use_count, 0); 1735 atomic_set(&arm_state->ka_use_ack_count, 0); 1736 atomic_set(&arm_state->ka_release_count, 0); 1737 1738 init_completion(&arm_state->vc_suspend_complete); 1739 1740 init_completion(&arm_state->vc_resume_complete); 1741 /* Initialise to 'done' state. We only want to block on resume 1742 * completion while videocore is suspended. */ 1743 set_resume_state(arm_state, VC_RESUME_RESUMED); 1744 1745 init_completion(&arm_state->resume_blocker); 1746 /* Initialise to 'done' state. We only want to block on this 1747 * completion while resume is blocked */ 1748 complete_all(&arm_state->resume_blocker); 1749 1750 init_completion(&arm_state->blocked_blocker); 1751 /* Initialise to 'done' state. We only want to block on this 1752 * completion while things are waiting on the resume blocker */ 1753 complete_all(&arm_state->blocked_blocker); 1754 1755 arm_state->suspend_timer_timeout = SUSPEND_TIMER_TIMEOUT_MS; 1756 arm_state->suspend_timer_running = 0; 1757 vchiq_init_timer(&arm_state->suspend_timer); 1758 arm_state->suspend_timer.data = (unsigned long)(state); 1759 arm_state->suspend_timer.function = suspend_timer_callback; 1760 1761 arm_state->first_connect = 0; 1762 1763 } 1764 return status; 1765 } 1766 1767 /* 1768 ** Functions to modify the state variables; 1769 ** set_suspend_state 1770 ** set_resume_state 1771 ** 1772 ** There are more state variables than we might like, so ensure they remain in 1773 ** step. Suspend and resume state are maintained separately, since most of 1774 ** these state machines can operate independently. However, there are a few 1775 ** states where state transitions in one state machine cause a reset to the 1776 ** other state machine. In addition, there are some completion events which 1777 ** need to occur on state machine reset and end-state(s), so these are also 1778 ** dealt with in these functions. 1779 ** 1780 ** In all states we set the state variable according to the input, but in some 1781 ** cases we perform additional steps outlined below; 1782 ** 1783 ** VC_SUSPEND_IDLE - Initialise the suspend completion at the same time. 1784 ** The suspend completion is completed after any suspend 1785 ** attempt. When we reset the state machine we also reset 1786 ** the completion. This reset occurs when videocore is 1787 ** resumed, and also if we initiate suspend after a suspend 1788 ** failure. 1789 ** 1790 ** VC_SUSPEND_IN_PROGRESS - This state is considered the point of no return for 1791 ** suspend - ie from this point on we must try to suspend 1792 ** before resuming can occur. We therefore also reset the 1793 ** resume state machine to VC_RESUME_IDLE in this state. 1794 ** 1795 ** VC_SUSPEND_SUSPENDED - Suspend has completed successfully. Also call 1796 ** complete_all on the suspend completion to notify 1797 ** anything waiting for suspend to happen. 1798 ** 1799 ** VC_SUSPEND_REJECTED - Videocore rejected suspend. Videocore will also 1800 ** initiate resume, so no need to alter resume state. 1801 ** We call complete_all on the suspend completion to notify 1802 ** of suspend rejection. 1803 ** 1804 ** VC_SUSPEND_FAILED - We failed to initiate videocore suspend. We notify the 1805 ** suspend completion and reset the resume state machine. 1806 ** 1807 ** VC_RESUME_IDLE - Initialise the resume completion at the same time. The 1808 ** resume completion is in its 'done' state whenever 1809 ** videcore is running. Therfore, the VC_RESUME_IDLE state 1810 ** implies that videocore is suspended. 1811 ** Hence, any thread which needs to wait until videocore is 1812 ** running can wait on this completion - it will only block 1813 ** if videocore is suspended. 1814 ** 1815 ** VC_RESUME_RESUMED - Resume has completed successfully. Videocore is running. 1816 ** Call complete_all on the resume completion to unblock 1817 ** any threads waiting for resume. Also reset the suspend 1818 ** state machine to it's idle state. 1819 ** 1820 ** VC_RESUME_FAILED - Currently unused - no mechanism to fail resume exists. 1821 */ 1822 1823 void 1824 set_suspend_state(VCHIQ_ARM_STATE_T *arm_state, 1825 enum vc_suspend_status new_state) 1826 { 1827 /* set the state in all cases */ 1828 arm_state->vc_suspend_state = new_state; 1829 1830 /* state specific additional actions */ 1831 switch (new_state) { 1832 case VC_SUSPEND_FORCE_CANCELED: 1833 complete_all(&arm_state->vc_suspend_complete); 1834 break; 1835 case VC_SUSPEND_REJECTED: 1836 complete_all(&arm_state->vc_suspend_complete); 1837 break; 1838 case VC_SUSPEND_FAILED: 1839 complete_all(&arm_state->vc_suspend_complete); 1840 arm_state->vc_resume_state = VC_RESUME_RESUMED; 1841 complete_all(&arm_state->vc_resume_complete); 1842 break; 1843 case VC_SUSPEND_IDLE: 1844 /* TODO: reinit_completion */ 1845 INIT_COMPLETION(arm_state->vc_suspend_complete); 1846 break; 1847 case VC_SUSPEND_REQUESTED: 1848 break; 1849 case VC_SUSPEND_IN_PROGRESS: 1850 set_resume_state(arm_state, VC_RESUME_IDLE); 1851 break; 1852 case VC_SUSPEND_SUSPENDED: 1853 complete_all(&arm_state->vc_suspend_complete); 1854 break; 1855 default: 1856 BUG(); 1857 break; 1858 } 1859 } 1860 1861 void 1862 set_resume_state(VCHIQ_ARM_STATE_T *arm_state, 1863 enum vc_resume_status new_state) 1864 { 1865 /* set the state in all cases */ 1866 arm_state->vc_resume_state = new_state; 1867 1868 /* state specific additional actions */ 1869 switch (new_state) { 1870 case VC_RESUME_FAILED: 1871 break; 1872 case VC_RESUME_IDLE: 1873 /* TODO: reinit_completion */ 1874 INIT_COMPLETION(arm_state->vc_resume_complete); 1875 break; 1876 case VC_RESUME_REQUESTED: 1877 break; 1878 case VC_RESUME_IN_PROGRESS: 1879 break; 1880 case VC_RESUME_RESUMED: 1881 complete_all(&arm_state->vc_resume_complete); 1882 set_suspend_state(arm_state, VC_SUSPEND_IDLE); 1883 break; 1884 default: 1885 BUG(); 1886 break; 1887 } 1888 } 1889 1890 1891 /* should be called with the write lock held */ 1892 inline void 1893 start_suspend_timer(VCHIQ_ARM_STATE_T *arm_state) 1894 { 1895 vchiq_del_timer(&arm_state->suspend_timer); 1896 arm_state->suspend_timer.expires = jiffies + 1897 msecs_to_jiffies(arm_state-> 1898 suspend_timer_timeout); 1899 vchiq_add_timer(&arm_state->suspend_timer); 1900 arm_state->suspend_timer_running = 1; 1901 } 1902 1903 /* should be called with the write lock held */ 1904 static inline void 1905 stop_suspend_timer(VCHIQ_ARM_STATE_T *arm_state) 1906 { 1907 if (arm_state->suspend_timer_running) { 1908 vchiq_del_timer(&arm_state->suspend_timer); 1909 arm_state->suspend_timer_running = 0; 1910 } 1911 } 1912 1913 static inline int 1914 need_resume(VCHIQ_STATE_T *state) 1915 { 1916 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 1917 return (arm_state->vc_suspend_state > VC_SUSPEND_IDLE) && 1918 (arm_state->vc_resume_state < VC_RESUME_REQUESTED) && 1919 vchiq_videocore_wanted(state); 1920 } 1921 1922 static int 1923 block_resume(VCHIQ_ARM_STATE_T *arm_state) 1924 { 1925 int status = VCHIQ_SUCCESS; 1926 const unsigned long timeout_val = 1927 msecs_to_jiffies(FORCE_SUSPEND_TIMEOUT_MS); 1928 int resume_count = 0; 1929 1930 /* Allow any threads which were blocked by the last force suspend to 1931 * complete if they haven't already. Only give this one shot; if 1932 * blocked_count is incremented after blocked_blocker is completed 1933 * (which only happens when blocked_count hits 0) then those threads 1934 * will have to wait until next time around */ 1935 if (arm_state->blocked_count) { 1936 /* TODO: reinit_completion */ 1937 INIT_COMPLETION(arm_state->blocked_blocker); 1938 write_unlock_bh(&arm_state->susp_res_lock); 1939 vchiq_log_info(vchiq_susp_log_level, "%s wait for previously " 1940 "blocked clients", __func__); 1941 if (wait_for_completion_interruptible_timeout( 1942 &arm_state->blocked_blocker, timeout_val) 1943 <= 0) { 1944 vchiq_log_error(vchiq_susp_log_level, "%s wait for " 1945 "previously blocked clients failed" , __func__); 1946 status = VCHIQ_ERROR; 1947 write_lock_bh(&arm_state->susp_res_lock); 1948 goto out; 1949 } 1950 vchiq_log_info(vchiq_susp_log_level, "%s previously blocked " 1951 "clients resumed", __func__); 1952 write_lock_bh(&arm_state->susp_res_lock); 1953 } 1954 1955 /* We need to wait for resume to complete if it's in process */ 1956 while (arm_state->vc_resume_state != VC_RESUME_RESUMED && 1957 arm_state->vc_resume_state > VC_RESUME_IDLE) { 1958 if (resume_count > 1) { 1959 status = VCHIQ_ERROR; 1960 vchiq_log_error(vchiq_susp_log_level, "%s waited too " 1961 "many times for resume" , __func__); 1962 goto out; 1963 } 1964 write_unlock_bh(&arm_state->susp_res_lock); 1965 vchiq_log_info(vchiq_susp_log_level, "%s wait for resume", 1966 __func__); 1967 if (wait_for_completion_interruptible_timeout( 1968 &arm_state->vc_resume_complete, timeout_val) 1969 <= 0) { 1970 vchiq_log_error(vchiq_susp_log_level, "%s wait for " 1971 "resume failed (%s)", __func__, 1972 resume_state_names[arm_state->vc_resume_state + 1973 VC_RESUME_NUM_OFFSET]); 1974 status = VCHIQ_ERROR; 1975 write_lock_bh(&arm_state->susp_res_lock); 1976 goto out; 1977 } 1978 vchiq_log_info(vchiq_susp_log_level, "%s resumed", __func__); 1979 write_lock_bh(&arm_state->susp_res_lock); 1980 resume_count++; 1981 } 1982 /* TODO: reinit_completion */ 1983 INIT_COMPLETION(arm_state->resume_blocker); 1984 arm_state->resume_blocked = 1; 1985 1986 out: 1987 return status; 1988 } 1989 1990 static inline void 1991 unblock_resume(VCHIQ_ARM_STATE_T *arm_state) 1992 { 1993 complete_all(&arm_state->resume_blocker); 1994 arm_state->resume_blocked = 0; 1995 } 1996 1997 /* Initiate suspend via slot handler. Should be called with the write lock 1998 * held */ 1999 VCHIQ_STATUS_T 2000 vchiq_arm_vcsuspend(VCHIQ_STATE_T *state) 2001 { 2002 VCHIQ_STATUS_T status = VCHIQ_ERROR; 2003 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2004 2005 if (!arm_state) 2006 goto out; 2007 2008 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2009 status = VCHIQ_SUCCESS; 2010 2011 2012 switch (arm_state->vc_suspend_state) { 2013 case VC_SUSPEND_REQUESTED: 2014 vchiq_log_info(vchiq_susp_log_level, "%s: suspend already " 2015 "requested", __func__); 2016 break; 2017 case VC_SUSPEND_IN_PROGRESS: 2018 vchiq_log_info(vchiq_susp_log_level, "%s: suspend already in " 2019 "progress", __func__); 2020 break; 2021 2022 default: 2023 /* We don't expect to be in other states, so log but continue 2024 * anyway */ 2025 vchiq_log_error(vchiq_susp_log_level, 2026 "%s unexpected suspend state %s", __func__, 2027 suspend_state_names[arm_state->vc_suspend_state + 2028 VC_SUSPEND_NUM_OFFSET]); 2029 /* fall through */ 2030 case VC_SUSPEND_REJECTED: 2031 case VC_SUSPEND_FAILED: 2032 /* Ensure any idle state actions have been run */ 2033 set_suspend_state(arm_state, VC_SUSPEND_IDLE); 2034 /* fall through */ 2035 case VC_SUSPEND_IDLE: 2036 vchiq_log_info(vchiq_susp_log_level, 2037 "%s: suspending", __func__); 2038 set_suspend_state(arm_state, VC_SUSPEND_REQUESTED); 2039 /* kick the slot handler thread to initiate suspend */ 2040 request_poll(state, NULL, 0); 2041 break; 2042 } 2043 2044 out: 2045 vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, status); 2046 return status; 2047 } 2048 2049 void 2050 vchiq_platform_check_suspend(VCHIQ_STATE_T *state) 2051 { 2052 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2053 int susp = 0; 2054 2055 if (!arm_state) 2056 goto out; 2057 2058 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2059 2060 write_lock_bh(&arm_state->susp_res_lock); 2061 if (arm_state->vc_suspend_state == VC_SUSPEND_REQUESTED && 2062 arm_state->vc_resume_state == VC_RESUME_RESUMED) { 2063 set_suspend_state(arm_state, VC_SUSPEND_IN_PROGRESS); 2064 susp = 1; 2065 } 2066 write_unlock_bh(&arm_state->susp_res_lock); 2067 2068 if (susp) 2069 vchiq_platform_suspend(state); 2070 2071 out: 2072 vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__); 2073 return; 2074 } 2075 2076 2077 static void 2078 output_timeout_error(VCHIQ_STATE_T *state) 2079 { 2080 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2081 char service_err[50] = ""; 2082 int vc_use_count = arm_state->videocore_use_count; 2083 int active_services = state->unused_service; 2084 int i; 2085 2086 if (!arm_state->videocore_use_count) { 2087 snprintf(service_err, 50, " Videocore usecount is 0"); 2088 goto output_msg; 2089 } 2090 for (i = 0; i < active_services; i++) { 2091 VCHIQ_SERVICE_T *service_ptr = state->services[i]; 2092 if (service_ptr && service_ptr->service_use_count && 2093 (service_ptr->srvstate != VCHIQ_SRVSTATE_FREE)) { 2094 snprintf(service_err, 50, " %c%c%c%c(%8x) service has " 2095 "use count %d%s", VCHIQ_FOURCC_AS_4CHARS( 2096 service_ptr->base.fourcc), 2097 service_ptr->client_id, 2098 service_ptr->service_use_count, 2099 service_ptr->service_use_count == 2100 vc_use_count ? "" : " (+ more)"); 2101 break; 2102 } 2103 } 2104 2105 output_msg: 2106 vchiq_log_error(vchiq_susp_log_level, 2107 "timed out waiting for vc suspend (%d).%s", 2108 arm_state->autosuspend_override, service_err); 2109 2110 } 2111 2112 /* Try to get videocore into suspended state, regardless of autosuspend state. 2113 ** We don't actually force suspend, since videocore may get into a bad state 2114 ** if we force suspend at a bad time. Instead, we wait for autosuspend to 2115 ** determine a good point to suspend. If this doesn't happen within 100ms we 2116 ** report failure. 2117 ** 2118 ** Returns VCHIQ_SUCCESS if videocore suspended successfully, VCHIQ_RETRY if 2119 ** videocore failed to suspend in time or VCHIQ_ERROR if interrupted. 2120 */ 2121 VCHIQ_STATUS_T 2122 vchiq_arm_force_suspend(VCHIQ_STATE_T *state) 2123 { 2124 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2125 VCHIQ_STATUS_T status = VCHIQ_ERROR; 2126 long rc = 0; 2127 int repeat = -1; 2128 2129 if (!arm_state) 2130 goto out; 2131 2132 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2133 2134 write_lock_bh(&arm_state->susp_res_lock); 2135 2136 status = block_resume(arm_state); 2137 if (status != VCHIQ_SUCCESS) 2138 goto unlock; 2139 if (arm_state->vc_suspend_state == VC_SUSPEND_SUSPENDED) { 2140 /* Already suspended - just block resume and exit */ 2141 vchiq_log_info(vchiq_susp_log_level, "%s already suspended", 2142 __func__); 2143 status = VCHIQ_SUCCESS; 2144 goto unlock; 2145 } else if (arm_state->vc_suspend_state <= VC_SUSPEND_IDLE) { 2146 /* initiate suspend immediately in the case that we're waiting 2147 * for the timeout */ 2148 stop_suspend_timer(arm_state); 2149 if (!vchiq_videocore_wanted(state)) { 2150 vchiq_log_info(vchiq_susp_log_level, "%s videocore " 2151 "idle, initiating suspend", __func__); 2152 status = vchiq_arm_vcsuspend(state); 2153 } else if (arm_state->autosuspend_override < 2154 FORCE_SUSPEND_FAIL_MAX) { 2155 vchiq_log_info(vchiq_susp_log_level, "%s letting " 2156 "videocore go idle", __func__); 2157 status = VCHIQ_SUCCESS; 2158 } else { 2159 vchiq_log_warning(vchiq_susp_log_level, "%s failed too " 2160 "many times - attempting suspend", __func__); 2161 status = vchiq_arm_vcsuspend(state); 2162 } 2163 } else { 2164 vchiq_log_info(vchiq_susp_log_level, "%s videocore suspend " 2165 "in progress - wait for completion", __func__); 2166 status = VCHIQ_SUCCESS; 2167 } 2168 2169 /* Wait for suspend to happen due to system idle (not forced..) */ 2170 if (status != VCHIQ_SUCCESS) 2171 goto unblock_resume; 2172 2173 do { 2174 write_unlock_bh(&arm_state->susp_res_lock); 2175 2176 rc = wait_for_completion_interruptible_timeout( 2177 &arm_state->vc_suspend_complete, 2178 msecs_to_jiffies(FORCE_SUSPEND_TIMEOUT_MS)); 2179 2180 write_lock_bh(&arm_state->susp_res_lock); 2181 if (rc < 0) { 2182 vchiq_log_warning(vchiq_susp_log_level, "%s " 2183 "interrupted waiting for suspend", __func__); 2184 status = VCHIQ_ERROR; 2185 goto unblock_resume; 2186 } else if (rc == 0) { 2187 if (arm_state->vc_suspend_state > VC_SUSPEND_IDLE) { 2188 /* Repeat timeout once if in progress */ 2189 if (repeat < 0) { 2190 repeat = 1; 2191 continue; 2192 } 2193 } 2194 arm_state->autosuspend_override++; 2195 output_timeout_error(state); 2196 2197 status = VCHIQ_RETRY; 2198 goto unblock_resume; 2199 } 2200 } while (0 < (repeat--)); 2201 2202 /* Check and report state in case we need to abort ARM suspend */ 2203 if (arm_state->vc_suspend_state != VC_SUSPEND_SUSPENDED) { 2204 status = VCHIQ_RETRY; 2205 vchiq_log_error(vchiq_susp_log_level, 2206 "%s videocore suspend failed (state %s)", __func__, 2207 suspend_state_names[arm_state->vc_suspend_state + 2208 VC_SUSPEND_NUM_OFFSET]); 2209 /* Reset the state only if it's still in an error state. 2210 * Something could have already initiated another suspend. */ 2211 if (arm_state->vc_suspend_state < VC_SUSPEND_IDLE) 2212 set_suspend_state(arm_state, VC_SUSPEND_IDLE); 2213 2214 goto unblock_resume; 2215 } 2216 2217 /* successfully suspended - unlock and exit */ 2218 goto unlock; 2219 2220 unblock_resume: 2221 /* all error states need to unblock resume before exit */ 2222 unblock_resume(arm_state); 2223 2224 unlock: 2225 write_unlock_bh(&arm_state->susp_res_lock); 2226 2227 out: 2228 vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, status); 2229 return status; 2230 } 2231 2232 void 2233 vchiq_check_suspend(VCHIQ_STATE_T *state) 2234 { 2235 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2236 2237 if (!arm_state) 2238 goto out; 2239 2240 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2241 2242 write_lock_bh(&arm_state->susp_res_lock); 2243 if (arm_state->vc_suspend_state != VC_SUSPEND_SUSPENDED && 2244 arm_state->first_connect && 2245 !vchiq_videocore_wanted(state)) { 2246 vchiq_arm_vcsuspend(state); 2247 } 2248 write_unlock_bh(&arm_state->susp_res_lock); 2249 2250 out: 2251 vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__); 2252 return; 2253 } 2254 2255 2256 int 2257 vchiq_arm_allow_resume(VCHIQ_STATE_T *state) 2258 { 2259 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2260 int resume = 0; 2261 int ret = -1; 2262 2263 if (!arm_state) 2264 goto out; 2265 2266 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2267 2268 write_lock_bh(&arm_state->susp_res_lock); 2269 unblock_resume(arm_state); 2270 resume = vchiq_check_resume(state); 2271 write_unlock_bh(&arm_state->susp_res_lock); 2272 2273 if (resume) { 2274 if (wait_for_completion_interruptible( 2275 &arm_state->vc_resume_complete) < 0) { 2276 vchiq_log_error(vchiq_susp_log_level, 2277 "%s interrupted", __func__); 2278 /* failed, cannot accurately derive suspend 2279 * state, so exit early. */ 2280 goto out; 2281 } 2282 } 2283 2284 read_lock_bh(&arm_state->susp_res_lock); 2285 if (arm_state->vc_suspend_state == VC_SUSPEND_SUSPENDED) { 2286 vchiq_log_info(vchiq_susp_log_level, 2287 "%s: Videocore remains suspended", __func__); 2288 } else { 2289 vchiq_log_info(vchiq_susp_log_level, 2290 "%s: Videocore resumed", __func__); 2291 ret = 0; 2292 } 2293 read_unlock_bh(&arm_state->susp_res_lock); 2294 out: 2295 vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret); 2296 return ret; 2297 } 2298 2299 /* This function should be called with the write lock held */ 2300 int 2301 vchiq_check_resume(VCHIQ_STATE_T *state) 2302 { 2303 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2304 int resume = 0; 2305 2306 if (!arm_state) 2307 goto out; 2308 2309 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2310 2311 if (need_resume(state)) { 2312 set_resume_state(arm_state, VC_RESUME_REQUESTED); 2313 request_poll(state, NULL, 0); 2314 resume = 1; 2315 } 2316 2317 out: 2318 vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__); 2319 return resume; 2320 } 2321 2322 #ifdef notyet 2323 void 2324 vchiq_platform_check_resume(VCHIQ_STATE_T *state) 2325 { 2326 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2327 int res = 0; 2328 2329 if (!arm_state) 2330 goto out; 2331 2332 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2333 2334 write_lock_bh(&arm_state->susp_res_lock); 2335 if (arm_state->wake_address == 0) { 2336 vchiq_log_info(vchiq_susp_log_level, 2337 "%s: already awake", __func__); 2338 goto unlock; 2339 } 2340 if (arm_state->vc_resume_state == VC_RESUME_IN_PROGRESS) { 2341 vchiq_log_info(vchiq_susp_log_level, 2342 "%s: already resuming", __func__); 2343 goto unlock; 2344 } 2345 2346 if (arm_state->vc_resume_state == VC_RESUME_REQUESTED) { 2347 set_resume_state(arm_state, VC_RESUME_IN_PROGRESS); 2348 res = 1; 2349 } else 2350 vchiq_log_trace(vchiq_susp_log_level, 2351 "%s: not resuming (resume state %s)", __func__, 2352 resume_state_names[arm_state->vc_resume_state + 2353 VC_RESUME_NUM_OFFSET]); 2354 2355 unlock: 2356 write_unlock_bh(&arm_state->susp_res_lock); 2357 2358 if (res) 2359 vchiq_platform_resume(state); 2360 2361 out: 2362 vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__); 2363 return; 2364 2365 } 2366 #endif 2367 2368 2369 2370 VCHIQ_STATUS_T 2371 vchiq_use_internal(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service, 2372 enum USE_TYPE_E use_type) 2373 { 2374 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2375 VCHIQ_STATUS_T ret = VCHIQ_SUCCESS; 2376 char entity[16]; 2377 int *entity_uc; 2378 int local_uc, local_entity_uc; 2379 2380 if (!arm_state) 2381 goto out; 2382 2383 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2384 2385 if (use_type == USE_TYPE_VCHIQ) { 2386 snprintf(entity, sizeof(entity), "VCHIQ: "); 2387 entity_uc = &arm_state->peer_use_count; 2388 } else if (service) { 2389 snprintf(entity, sizeof(entity), "%c%c%c%c:%8x", 2390 VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc), 2391 service->client_id); 2392 entity_uc = &service->service_use_count; 2393 } else { 2394 vchiq_log_error(vchiq_susp_log_level, "%s null service " 2395 "ptr", __func__); 2396 ret = VCHIQ_ERROR; 2397 goto out; 2398 } 2399 2400 write_lock_bh(&arm_state->susp_res_lock); 2401 while (arm_state->resume_blocked) { 2402 /* If we call 'use' while force suspend is waiting for suspend, 2403 * then we're about to block the thread which the force is 2404 * waiting to complete, so we're bound to just time out. In this 2405 * case, set the suspend state such that the wait will be 2406 * canceled, so we can complete as quickly as possible. */ 2407 if (arm_state->resume_blocked && arm_state->vc_suspend_state == 2408 VC_SUSPEND_IDLE) { 2409 set_suspend_state(arm_state, VC_SUSPEND_FORCE_CANCELED); 2410 break; 2411 } 2412 /* If suspend is already in progress then we need to block */ 2413 if (!try_wait_for_completion(&arm_state->resume_blocker)) { 2414 /* Indicate that there are threads waiting on the resume 2415 * blocker. These need to be allowed to complete before 2416 * a _second_ call to force suspend can complete, 2417 * otherwise low priority threads might never actually 2418 * continue */ 2419 arm_state->blocked_count++; 2420 write_unlock_bh(&arm_state->susp_res_lock); 2421 vchiq_log_info(vchiq_susp_log_level, "%s %s resume " 2422 "blocked - waiting...", __func__, entity); 2423 if (wait_for_completion_killable( 2424 &arm_state->resume_blocker) != 0) { 2425 vchiq_log_error(vchiq_susp_log_level, "%s %s " 2426 "wait for resume blocker interrupted", 2427 __func__, entity); 2428 ret = VCHIQ_ERROR; 2429 write_lock_bh(&arm_state->susp_res_lock); 2430 arm_state->blocked_count--; 2431 write_unlock_bh(&arm_state->susp_res_lock); 2432 goto out; 2433 } 2434 vchiq_log_info(vchiq_susp_log_level, "%s %s resume " 2435 "unblocked", __func__, entity); 2436 write_lock_bh(&arm_state->susp_res_lock); 2437 if (--arm_state->blocked_count == 0) 2438 complete_all(&arm_state->blocked_blocker); 2439 } 2440 } 2441 2442 stop_suspend_timer(arm_state); 2443 2444 local_uc = ++arm_state->videocore_use_count; 2445 local_entity_uc = ++(*entity_uc); 2446 2447 /* If there's a pending request which hasn't yet been serviced then 2448 * just clear it. If we're past VC_SUSPEND_REQUESTED state then 2449 * vc_resume_complete will block until we either resume or fail to 2450 * suspend */ 2451 if (arm_state->vc_suspend_state <= VC_SUSPEND_REQUESTED) 2452 set_suspend_state(arm_state, VC_SUSPEND_IDLE); 2453 2454 if ((use_type != USE_TYPE_SERVICE_NO_RESUME) && need_resume(state)) { 2455 set_resume_state(arm_state, VC_RESUME_REQUESTED); 2456 vchiq_log_info(vchiq_susp_log_level, 2457 "%s %s count %d, state count %d", 2458 __func__, entity, local_entity_uc, local_uc); 2459 request_poll(state, NULL, 0); 2460 } else 2461 vchiq_log_trace(vchiq_susp_log_level, 2462 "%s %s count %d, state count %d", 2463 __func__, entity, *entity_uc, local_uc); 2464 2465 2466 write_unlock_bh(&arm_state->susp_res_lock); 2467 2468 /* Completion is in a done state when we're not suspended, so this won't 2469 * block for the non-suspended case. */ 2470 if (!try_wait_for_completion(&arm_state->vc_resume_complete)) { 2471 vchiq_log_info(vchiq_susp_log_level, "%s %s wait for resume", 2472 __func__, entity); 2473 if (wait_for_completion_killable( 2474 &arm_state->vc_resume_complete) != 0) { 2475 vchiq_log_error(vchiq_susp_log_level, "%s %s wait for " 2476 "resume interrupted", __func__, entity); 2477 ret = VCHIQ_ERROR; 2478 goto out; 2479 } 2480 vchiq_log_info(vchiq_susp_log_level, "%s %s resumed", __func__, 2481 entity); 2482 } 2483 2484 if (ret == VCHIQ_SUCCESS) { 2485 VCHIQ_STATUS_T status = VCHIQ_SUCCESS; 2486 long ack_cnt = atomic_xchg(&arm_state->ka_use_ack_count, 0); 2487 while (ack_cnt && (status == VCHIQ_SUCCESS)) { 2488 /* Send the use notify to videocore */ 2489 status = vchiq_send_remote_use_active(state); 2490 if (status == VCHIQ_SUCCESS) 2491 ack_cnt--; 2492 else 2493 atomic_add(ack_cnt, 2494 &arm_state->ka_use_ack_count); 2495 } 2496 } 2497 2498 out: 2499 vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret); 2500 return ret; 2501 } 2502 2503 VCHIQ_STATUS_T 2504 vchiq_release_internal(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service) 2505 { 2506 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2507 VCHIQ_STATUS_T ret = VCHIQ_SUCCESS; 2508 char entity[16]; 2509 int *entity_uc; 2510 2511 if (!arm_state) 2512 goto out; 2513 2514 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2515 2516 if (service) { 2517 snprintf(entity, sizeof(entity), "%c%c%c%c:%8x", 2518 VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc), 2519 service->client_id); 2520 entity_uc = &service->service_use_count; 2521 } else { 2522 snprintf(entity, sizeof(entity), "PEER: "); 2523 entity_uc = &arm_state->peer_use_count; 2524 } 2525 2526 write_lock_bh(&arm_state->susp_res_lock); 2527 if (!arm_state->videocore_use_count || !(*entity_uc)) { 2528 /* Don't use BUG_ON - don't allow user thread to crash kernel */ 2529 WARN_ON(!arm_state->videocore_use_count); 2530 WARN_ON(!(*entity_uc)); 2531 ret = VCHIQ_ERROR; 2532 goto unlock; 2533 } 2534 --arm_state->videocore_use_count; 2535 --(*entity_uc); 2536 2537 if (!vchiq_videocore_wanted(state)) { 2538 if (vchiq_platform_use_suspend_timer() && 2539 !arm_state->resume_blocked) { 2540 /* Only use the timer if we're not trying to force 2541 * suspend (=> resume_blocked) */ 2542 start_suspend_timer(arm_state); 2543 } else { 2544 vchiq_log_info(vchiq_susp_log_level, 2545 "%s %s count %d, state count %d - suspending", 2546 __func__, entity, *entity_uc, 2547 arm_state->videocore_use_count); 2548 vchiq_arm_vcsuspend(state); 2549 } 2550 } else 2551 vchiq_log_trace(vchiq_susp_log_level, 2552 "%s %s count %d, state count %d", 2553 __func__, entity, *entity_uc, 2554 arm_state->videocore_use_count); 2555 2556 unlock: 2557 write_unlock_bh(&arm_state->susp_res_lock); 2558 2559 out: 2560 vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret); 2561 return ret; 2562 } 2563 2564 void 2565 vchiq_on_remote_use(VCHIQ_STATE_T *state) 2566 { 2567 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2568 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2569 atomic_inc(&arm_state->ka_use_count); 2570 complete(&arm_state->ka_evt); 2571 } 2572 2573 void 2574 vchiq_on_remote_release(VCHIQ_STATE_T *state) 2575 { 2576 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2577 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2578 atomic_inc(&arm_state->ka_release_count); 2579 complete(&arm_state->ka_evt); 2580 } 2581 2582 VCHIQ_STATUS_T 2583 vchiq_use_service_internal(VCHIQ_SERVICE_T *service) 2584 { 2585 return vchiq_use_internal(service->state, service, USE_TYPE_SERVICE); 2586 } 2587 2588 VCHIQ_STATUS_T 2589 vchiq_release_service_internal(VCHIQ_SERVICE_T *service) 2590 { 2591 return vchiq_release_internal(service->state, service); 2592 } 2593 2594 static void suspend_timer_callback(unsigned long context) 2595 { 2596 VCHIQ_STATE_T *state = (VCHIQ_STATE_T *)context; 2597 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2598 if (!arm_state) 2599 goto out; 2600 vchiq_log_info(vchiq_susp_log_level, 2601 "%s - suspend timer expired - check suspend", __func__); 2602 vchiq_check_suspend(state); 2603 out: 2604 return; 2605 } 2606 2607 VCHIQ_STATUS_T 2608 vchiq_use_service_no_resume(VCHIQ_SERVICE_HANDLE_T handle) 2609 { 2610 VCHIQ_STATUS_T ret = VCHIQ_ERROR; 2611 VCHIQ_SERVICE_T *service = find_service_by_handle(handle); 2612 if (service) { 2613 ret = vchiq_use_internal(service->state, service, 2614 USE_TYPE_SERVICE_NO_RESUME); 2615 unlock_service(service); 2616 } 2617 return ret; 2618 } 2619 2620 VCHIQ_STATUS_T 2621 vchiq_use_service(VCHIQ_SERVICE_HANDLE_T handle) 2622 { 2623 VCHIQ_STATUS_T ret = VCHIQ_ERROR; 2624 VCHIQ_SERVICE_T *service = find_service_by_handle(handle); 2625 if (service) { 2626 ret = vchiq_use_internal(service->state, service, 2627 USE_TYPE_SERVICE); 2628 unlock_service(service); 2629 } 2630 return ret; 2631 } 2632 2633 VCHIQ_STATUS_T 2634 vchiq_release_service(VCHIQ_SERVICE_HANDLE_T handle) 2635 { 2636 VCHIQ_STATUS_T ret = VCHIQ_ERROR; 2637 VCHIQ_SERVICE_T *service = find_service_by_handle(handle); 2638 if (service) { 2639 ret = vchiq_release_internal(service->state, service); 2640 unlock_service(service); 2641 } 2642 return ret; 2643 } 2644 2645 void 2646 vchiq_dump_service_use_state(VCHIQ_STATE_T *state) 2647 { 2648 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2649 int i, j = 0; 2650 /* Only dump 64 services */ 2651 static const int local_max_services = 64; 2652 /* If there's more than 64 services, only dump ones with 2653 * non-zero counts */ 2654 int only_nonzero = 0; 2655 static const char *nz = "<-- preventing suspend"; 2656 2657 enum vc_suspend_status vc_suspend_state; 2658 enum vc_resume_status vc_resume_state; 2659 int peer_count; 2660 int vc_use_count; 2661 int active_services; 2662 struct service_data_struct { 2663 int fourcc; 2664 int clientid; 2665 int use_count; 2666 } service_data[local_max_services]; 2667 2668 if (!arm_state) 2669 return; 2670 2671 read_lock_bh(&arm_state->susp_res_lock); 2672 vc_suspend_state = arm_state->vc_suspend_state; 2673 vc_resume_state = arm_state->vc_resume_state; 2674 peer_count = arm_state->peer_use_count; 2675 vc_use_count = arm_state->videocore_use_count; 2676 active_services = state->unused_service; 2677 if (active_services > local_max_services) 2678 only_nonzero = 1; 2679 2680 for (i = 0; (i < active_services) && (j < local_max_services); i++) { 2681 VCHIQ_SERVICE_T *service_ptr = state->services[i]; 2682 if (!service_ptr) 2683 continue; 2684 2685 if (only_nonzero && !service_ptr->service_use_count) 2686 continue; 2687 2688 if (service_ptr->srvstate != VCHIQ_SRVSTATE_FREE) { 2689 service_data[j].fourcc = service_ptr->base.fourcc; 2690 service_data[j].clientid = service_ptr->client_id; 2691 service_data[j++].use_count = service_ptr-> 2692 service_use_count; 2693 } 2694 } 2695 2696 read_unlock_bh(&arm_state->susp_res_lock); 2697 2698 vchiq_log_warning(vchiq_susp_log_level, 2699 "-- Videcore suspend state: %s --", 2700 suspend_state_names[vc_suspend_state + VC_SUSPEND_NUM_OFFSET]); 2701 vchiq_log_warning(vchiq_susp_log_level, 2702 "-- Videcore resume state: %s --", 2703 resume_state_names[vc_resume_state + VC_RESUME_NUM_OFFSET]); 2704 2705 if (only_nonzero) 2706 vchiq_log_warning(vchiq_susp_log_level, "Too many active " 2707 "services (%d). Only dumping up to first %d services " 2708 "with non-zero use-count", active_services, 2709 local_max_services); 2710 2711 for (i = 0; i < j; i++) { 2712 vchiq_log_warning(vchiq_susp_log_level, 2713 "----- %c%c%c%c:%d service count %d %s", 2714 VCHIQ_FOURCC_AS_4CHARS(service_data[i].fourcc), 2715 service_data[i].clientid, 2716 service_data[i].use_count, 2717 service_data[i].use_count ? nz : ""); 2718 } 2719 vchiq_log_warning(vchiq_susp_log_level, 2720 "----- VCHIQ use count count %d", peer_count); 2721 vchiq_log_warning(vchiq_susp_log_level, 2722 "--- Overall vchiq instance use count %d", vc_use_count); 2723 2724 vchiq_dump_platform_use_state(state); 2725 } 2726 2727 VCHIQ_STATUS_T 2728 vchiq_check_service(VCHIQ_SERVICE_T *service) 2729 { 2730 VCHIQ_ARM_STATE_T *arm_state; 2731 VCHIQ_STATUS_T ret = VCHIQ_ERROR; 2732 2733 if (!service || !service->state) 2734 goto out; 2735 2736 vchiq_log_trace(vchiq_susp_log_level, "%s", __func__); 2737 2738 arm_state = vchiq_platform_get_arm_state(service->state); 2739 2740 read_lock_bh(&arm_state->susp_res_lock); 2741 if (service->service_use_count) 2742 ret = VCHIQ_SUCCESS; 2743 read_unlock_bh(&arm_state->susp_res_lock); 2744 2745 if (ret == VCHIQ_ERROR) { 2746 vchiq_log_error(vchiq_susp_log_level, 2747 "%s ERROR - %c%c%c%c:%8x service count %d, " 2748 "state count %d, videocore suspend state %s", __func__, 2749 VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc), 2750 service->client_id, service->service_use_count, 2751 arm_state->videocore_use_count, 2752 suspend_state_names[arm_state->vc_suspend_state + 2753 VC_SUSPEND_NUM_OFFSET]); 2754 vchiq_dump_service_use_state(service->state); 2755 } 2756 out: 2757 return ret; 2758 } 2759 2760 /* stub functions */ 2761 void vchiq_on_remote_use_active(VCHIQ_STATE_T *state) 2762 { 2763 (void)state; 2764 } 2765 2766 void vchiq_platform_conn_state_changed(VCHIQ_STATE_T *state, 2767 VCHIQ_CONNSTATE_T oldstate, VCHIQ_CONNSTATE_T newstate) 2768 { 2769 VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state); 2770 vchiq_log_info(vchiq_susp_log_level, "%d: %s->%s", state->id, 2771 get_conn_state_name(oldstate), get_conn_state_name(newstate)); 2772 if (state->conn_state == VCHIQ_CONNSTATE_CONNECTED) { 2773 write_lock_bh(&arm_state->susp_res_lock); 2774 if (!arm_state->first_connect) { 2775 char threadname[10]; 2776 arm_state->first_connect = 1; 2777 write_unlock_bh(&arm_state->susp_res_lock); 2778 snprintf(threadname, sizeof(threadname), "VCHIQka-%d", 2779 state->id); 2780 arm_state->ka_thread = vchiq_thread_create( 2781 &vchiq_keepalive_thread_func, 2782 (void *)state, 2783 threadname); 2784 if (arm_state->ka_thread == NULL) { 2785 vchiq_log_error(vchiq_susp_log_level, 2786 "vchiq: FATAL: couldn't create thread %s", 2787 threadname); 2788 } else { 2789 wake_up_process(arm_state->ka_thread); 2790 } 2791 } else 2792 write_unlock_bh(&arm_state->susp_res_lock); 2793 } 2794 } 2795 2796 /**************************************************************************** 2797 * 2798 * vchiq_init - called when the module is loaded. 2799 * 2800 ***************************************************************************/ 2801 2802 int __init vchiq_init(void); 2803 int __init 2804 vchiq_init(void) 2805 { 2806 int err; 2807 2808 #ifdef notyet 2809 /* create proc entries */ 2810 err = vchiq_proc_init(); 2811 if (err != 0) 2812 goto failed_proc_init; 2813 #endif 2814 2815 vchiq_cdev = make_dev(&vchiq_cdevsw, 0, 2816 UID_ROOT, GID_WHEEL, 0600, "vchiq"); 2817 if (!vchiq_cdev) { 2818 printf("Failed to create /dev/vchiq"); 2819 return (-ENXIO); 2820 } 2821 2822 spin_lock_init(&msg_queue_spinlock); 2823 2824 err = vchiq_platform_init(&g_state); 2825 if (err != 0) 2826 goto failed_platform_init; 2827 2828 vchiq_log_info(vchiq_arm_log_level, 2829 "vchiq: initialised - version %d (min %d)", 2830 VCHIQ_VERSION, VCHIQ_VERSION_MIN); 2831 2832 return 0; 2833 2834 failed_platform_init: 2835 if (vchiq_cdev) { 2836 destroy_dev(vchiq_cdev); 2837 vchiq_cdev = NULL; 2838 } 2839 vchiq_log_warning(vchiq_arm_log_level, "could not load vchiq"); 2840 return err; 2841 } 2842 2843 #ifdef notyet 2844 static int vchiq_instance_get_use_count(VCHIQ_INSTANCE_T instance) 2845 { 2846 VCHIQ_SERVICE_T *service; 2847 int use_count = 0, i; 2848 i = 0; 2849 while ((service = next_service_by_instance(instance->state, 2850 instance, &i)) != NULL) { 2851 use_count += service->service_use_count; 2852 unlock_service(service); 2853 } 2854 return use_count; 2855 } 2856 2857 /* read the per-process use-count */ 2858 static int proc_read_use_count(char *page, char **start, 2859 off_t off, int count, 2860 int *eof, void *data) 2861 { 2862 VCHIQ_INSTANCE_T instance = data; 2863 int len, use_count; 2864 2865 use_count = vchiq_instance_get_use_count(instance); 2866 len = snprintf(page+off, count, "%d\n", use_count); 2867 2868 return len; 2869 } 2870 2871 /* add an instance (process) to the proc entries */ 2872 static int vchiq_proc_add_instance(VCHIQ_INSTANCE_T instance) 2873 { 2874 char pidstr[32]; 2875 struct proc_dir_entry *top, *use_count; 2876 struct proc_dir_entry *clients = vchiq_clients_top(); 2877 int pid = instance->pid; 2878 2879 snprintf(pidstr, sizeof(pidstr), "%d", pid); 2880 top = proc_mkdir(pidstr, clients); 2881 if (!top) 2882 goto fail_top; 2883 2884 use_count = create_proc_read_entry("use_count", 2885 0444, top, 2886 proc_read_use_count, 2887 instance); 2888 if (!use_count) 2889 goto fail_use_count; 2890 2891 instance->proc_entry = top; 2892 2893 return 0; 2894 2895 fail_use_count: 2896 remove_proc_entry(top->name, clients); 2897 fail_top: 2898 return -ENOMEM; 2899 } 2900 2901 static void vchiq_proc_remove_instance(VCHIQ_INSTANCE_T instance) 2902 { 2903 struct proc_dir_entry *clients = vchiq_clients_top(); 2904 remove_proc_entry("use_count", instance->proc_entry); 2905 remove_proc_entry(instance->proc_entry->name, clients); 2906 } 2907 2908 #endif 2909 2910 /**************************************************************************** 2911 * 2912 * vchiq_exit - called when the module is unloaded. 2913 * 2914 ***************************************************************************/ 2915 2916 void vchiq_exit(void); 2917 void 2918 vchiq_exit(void) 2919 { 2920 2921 vchiq_platform_exit(&g_state); 2922 if (vchiq_cdev) { 2923 destroy_dev(vchiq_cdev); 2924 vchiq_cdev = NULL; 2925 } 2926 }
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