osfmk/kern/processor.c

   1 /*
   2  * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 /*
  57  */
  58
  59 /*
  60  *      processor.c: processor and processor_set manipulation routines.
  61  */
  62
  63 #include <mach/boolean.h>
  64 #include <mach/policy.h>
  65 #include <mach/processor.h>
  66 #include <mach/processor_info.h>
  67 #include <mach/vm_param.h>
  68 #include <kern/cpu_number.h>
  69 #include <kern/host.h>
  70 #include <kern/machine.h>
  71 #include <kern/misc_protos.h>
  72 #include <kern/processor.h>
  73 #include <kern/sched.h>
  74 #include <kern/task.h>
  75 #include <kern/thread.h>
  76 #include <kern/ipc_host.h>
  77 #include <kern/ipc_tt.h>
  78 #include <ipc/ipc_port.h>
  79 #include <kern/kalloc.h>
  80
  81 /*
  82  * Exported interface
  83  */
  84 #include <mach/mach_host_server.h>
  85 #include <mach/processor_set_server.h>
  86
  87 struct processor_set    pset0;
  88 struct pset_node                pset_node0;
  89 decl_simple_lock_data(static,pset_node_lock)
  90
  91 queue_head_t                    tasks;
  92 queue_head_t                    terminated_tasks;       /* To be used ONLY for stackshot. */
  93 int                                             tasks_count;
  94 queue_head_t                    threads;
  95 int                                             threads_count;
  96 decl_lck_mtx_data(,tasks_threads_lock)
  97
  98 processor_t                             processor_list;
  99 unsigned int                    processor_count;
 100 static processor_t              processor_list_tail;
 101 decl_simple_lock_data(,processor_list_lock)
 102
 103 uint32_t                                processor_avail_count;
 104
 105 processor_t             master_processor;
 106 int                     master_cpu = 0;
 107 boolean_t               sched_stats_active = FALSE;
 108
 109 /* Forwards */
 110 kern_return_t   processor_set_things(
 111                 processor_set_t         pset,
 112                 mach_port_t             **thing_list,
 113                 mach_msg_type_number_t  *count,
 114                 int                     type);
 115
 116 void
 117 processor_bootstrap(void)
 118 {
 119         pset_init(&pset0, &pset_node0);
 120         pset_node0.psets = &pset0;
 121
 122         simple_lock_init(&pset_node_lock, 0);
 123
 124         queue_init(&tasks);
 125         queue_init(&terminated_tasks);
 126         queue_init(&threads);
 127
 128         simple_lock_init(&processor_list_lock, 0);
 129
 130         master_processor = cpu_to_processor(master_cpu);
 131
 132         processor_init(master_processor, master_cpu, &pset0);
 133 }
 134
 135 /*
 136  *      Initialize the given processor for the cpu
 137  *      indicated by cpu_id, and assign to the
 138  *      specified processor set.
 139  */
 140 void
 141 processor_init(
 142         processor_t                     processor,
 143         int                                     cpu_id,
 144         processor_set_t         pset)
 145 {
 146         if (processor != master_processor) {
 147                 /* Scheduler state deferred until sched_init() */
 148                 SCHED(processor_init)(processor);
 149         }
 150
 151         processor->state = PROCESSOR_OFF_LINE;
 152         processor->active_thread = processor->next_thread = processor->idle_thread = THREAD_NULL;
 153         processor->processor_set = pset;
 154         processor->current_pri = MINPRI;
 155         processor->current_thmode = TH_MODE_NONE;
 156         processor->cpu_id = cpu_id;
 157         timer_call_setup(&processor->quantum_timer, thread_quantum_expire, processor);
 158         processor->deadline = UINT64_MAX;
 159         processor->timeslice = 0;
 160         processor->processor_meta = PROCESSOR_META_NULL;
 161         processor->processor_self = IP_NULL;
 162         processor_data_init(processor);
 163         processor->processor_list = NULL;
 164
 165         pset_lock(pset);
 166         if (pset->cpu_set_count++ == 0)
 167                 pset->cpu_set_low = pset->cpu_set_hi = cpu_id;
 168         else {
 169                 pset->cpu_set_low = (cpu_id < pset->cpu_set_low)? cpu_id: pset->cpu_set_low;
 170                 pset->cpu_set_hi = (cpu_id > pset->cpu_set_hi)? cpu_id: pset->cpu_set_hi;
 171         }
 172         pset_unlock(pset);
 173
 174         simple_lock(&processor_list_lock);
 175         if (processor_list == NULL)
 176                 processor_list = processor;
 177         else
 178                 processor_list_tail->processor_list = processor;
 179         processor_list_tail = processor;
 180         processor_count++;
 181         simple_unlock(&processor_list_lock);
 182 }
 183
 184 void
 185 processor_meta_init(
 186         processor_t             processor,
 187         processor_t             primary)
 188 {
 189         processor_meta_t        pmeta = primary->processor_meta;
 190
 191         if (pmeta == PROCESSOR_META_NULL) {
 192                 pmeta = kalloc(sizeof (*pmeta));
 193
 194                 queue_init(&pmeta->idle_queue);
 195
 196                 pmeta->primary = primary;
 197         }
 198
 199         processor->processor_meta = pmeta;
 200 }
 201
 202 processor_set_t
 203 processor_pset(
 204         processor_t     processor)
 205 {
 206         return (processor->processor_set);
 207 }
 208
 209 pset_node_t
 210 pset_node_root(void)
 211 {
 212         return &pset_node0;
 213 }
 214
 215 processor_set_t
 216 pset_create(
 217         pset_node_t                     node)
 218 {
 219         processor_set_t         *prev, pset = kalloc(sizeof (*pset));
 220
 221         if (pset != PROCESSOR_SET_NULL) {
 222                 pset_init(pset, node);
 223
 224                 simple_lock(&pset_node_lock);
 225
 226                 prev = &node->psets;
 227                 while (*prev != PROCESSOR_SET_NULL)
 228                         prev = &(*prev)->pset_list;
 229
 230                 *prev = pset;
 231
 232                 simple_unlock(&pset_node_lock);
 233         }
 234
 235         return (pset);
 236 }
 237
 238 /*
 239  *      Initialize the given processor_set structure.
 240  */
 241 void
 242 pset_init(
 243         processor_set_t         pset,
 244         pset_node_t                     node)
 245 {
 246         if (pset != &pset0) {
 247                 /* Scheduler state deferred until sched_init() */
 248                 SCHED(pset_init)(pset);
 249         }
 250
 251         queue_init(&pset->active_queue);
 252         queue_init(&pset->idle_queue);
 253         pset->online_processor_count = 0;
 254         pset_pri_init_hint(pset, PROCESSOR_NULL);
 255         pset_count_init_hint(pset, PROCESSOR_NULL);
 256         pset->cpu_set_low = pset->cpu_set_hi = 0;
 257         pset->cpu_set_count = 0;
 258         pset_lock_init(pset);
 259         pset->pset_self = IP_NULL;
 260         pset->pset_name_self = IP_NULL;
 261         pset->pset_list = PROCESSOR_SET_NULL;
 262         pset->node = node;
 263 }
 264
 265 kern_return_t
 266 processor_info_count(
 267         processor_flavor_t              flavor,
 268         mach_msg_type_number_t  *count)
 269 {
 270         switch (flavor) {
 271
 272         case PROCESSOR_BASIC_INFO:
 273                 *count = PROCESSOR_BASIC_INFO_COUNT;
 274                 break;
 275
 276         case PROCESSOR_CPU_LOAD_INFO:
 277                 *count = PROCESSOR_CPU_LOAD_INFO_COUNT;
 278                 break;
 279
 280         default:
 281                 return (cpu_info_count(flavor, count));
 282         }
 283
 284         return (KERN_SUCCESS);
 285 }
 286
 287
 288 kern_return_t
 289 processor_info(
 290         register processor_t    processor,
 291         processor_flavor_t              flavor,
 292         host_t                                  *host,
 293         processor_info_t                info,
 294         mach_msg_type_number_t  *count)
 295 {
 296         register int    cpu_id, state;
 297         kern_return_t   result;
 298
 299         if (processor == PROCESSOR_NULL)
 300                 return (KERN_INVALID_ARGUMENT);
 301
 302         cpu_id = processor->cpu_id;
 303
 304         switch (flavor) {
 305
 306         case PROCESSOR_BASIC_INFO:
 307         {
 308                 register processor_basic_info_t         basic_info;
 309
 310                 if (*count < PROCESSOR_BASIC_INFO_COUNT)
 311                         return (KERN_FAILURE);
 312
 313                 basic_info = (processor_basic_info_t) info;
 314                 basic_info->cpu_type = slot_type(cpu_id);
 315                 basic_info->cpu_subtype = slot_subtype(cpu_id);
 316                 state = processor->state;
 317                 if (state == PROCESSOR_OFF_LINE)
 318                         basic_info->running = FALSE;
 319                 else
 320                         basic_info->running = TRUE;
 321                 basic_info->slot_num = cpu_id;
 322                 if (processor == master_processor)
 323                         basic_info->is_master = TRUE;
 324                 else
 325                         basic_info->is_master = FALSE;
 326
 327                 *count = PROCESSOR_BASIC_INFO_COUNT;
 328                 *host = &realhost;
 329
 330             return (KERN_SUCCESS);
 331         }
 332
 333         case PROCESSOR_CPU_LOAD_INFO:
 334         {
 335                 register processor_cpu_load_info_t      cpu_load_info;
 336
 337                 if (*count < PROCESSOR_CPU_LOAD_INFO_COUNT)
 338                         return (KERN_FAILURE);
 339
 340                 cpu_load_info = (processor_cpu_load_info_t) info;
 341                 cpu_load_info->cpu_ticks[CPU_STATE_USER] =
 342                                                         (uint32_t)(timer_grab(&PROCESSOR_DATA(processor, user_state)) / hz_tick_interval);
 343                 cpu_load_info->cpu_ticks[CPU_STATE_SYSTEM] =
 344                                                         (uint32_t)(timer_grab(&PROCESSOR_DATA(processor, system_state)) / hz_tick_interval);
 345                 {
 346                 timer_data_t    idle_temp;
 347                 timer_t         idle_state;
 348
 349                 idle_state = &PROCESSOR_DATA(processor, idle_state);
 350                 idle_temp = *idle_state;
 351
 352                 if (PROCESSOR_DATA(processor, current_state) != idle_state ||
 353                     timer_grab(&idle_temp) != timer_grab(idle_state))
 354                         cpu_load_info->cpu_ticks[CPU_STATE_IDLE] =
 355                                                         (uint32_t)(timer_grab(&PROCESSOR_DATA(processor, idle_state)) / hz_tick_interval);
 356                 else {
 357                         timer_advance(&idle_temp, mach_absolute_time() - idle_temp.tstamp);
 358
 359                         cpu_load_info->cpu_ticks[CPU_STATE_IDLE] =
 360                                 (uint32_t)(timer_grab(&idle_temp) / hz_tick_interval);
 361                 }
 362                 }
 363                 cpu_load_info->cpu_ticks[CPU_STATE_NICE] = 0;
 364
 365             *count = PROCESSOR_CPU_LOAD_INFO_COUNT;
 366             *host = &realhost;
 367
 368             return (KERN_SUCCESS);
 369         }
 370
 371         default:
 372             result = cpu_info(flavor, cpu_id, info, count);
 373             if (result == KERN_SUCCESS)
 374                         *host = &realhost;
 375
 376             return (result);
 377         }
 378 }
 379
 380 kern_return_t
 381 processor_start(
 382         processor_t                     processor)
 383 {
 384         processor_set_t         pset;
 385         thread_t                        thread;
 386         kern_return_t           result;
 387         spl_t                           s;
 388
 389         if (processor == PROCESSOR_NULL || processor->processor_set == PROCESSOR_SET_NULL)
 390                 return (KERN_INVALID_ARGUMENT);
 391
 392         if (processor == master_processor) {
 393                 processor_t             prev;
 394
 395                 prev = thread_bind(processor);
 396                 thread_block(THREAD_CONTINUE_NULL);
 397
 398                 result = cpu_start(processor->cpu_id);
 399
 400                 thread_bind(prev);
 401
 402                 return (result);
 403         }
 404
 405         s = splsched();
 406         pset = processor->processor_set;
 407         pset_lock(pset);
 408         if (processor->state != PROCESSOR_OFF_LINE) {
 409                 pset_unlock(pset);
 410                 splx(s);
 411
 412                 return (KERN_FAILURE);
 413         }
 414
 415         processor->state = PROCESSOR_START;
 416         pset_unlock(pset);
 417         splx(s);
 418
 419         /*
 420          *      Create the idle processor thread.
 421          */
 422         if (processor->idle_thread == THREAD_NULL) {
 423                 result = idle_thread_create(processor);
 424                 if (result != KERN_SUCCESS) {
 425                         s = splsched();
 426                         pset_lock(pset);
 427                         processor->state = PROCESSOR_OFF_LINE;
 428                         pset_unlock(pset);
 429                         splx(s);
 430
 431                         return (result);
 432                 }
 433         }
 434
 435         /*
 436          *      If there is no active thread, the processor
 437          *      has never been started.  Create a dedicated
 438          *      start up thread.
 439          */
 440         if (    processor->active_thread == THREAD_NULL         &&
 441                         processor->next_thread == THREAD_NULL           ) {
 442                 result = kernel_thread_create((thread_continue_t)processor_start_thread, NULL, MAXPRI_KERNEL, &thread);
 443                 if (result != KERN_SUCCESS) {
 444                         s = splsched();
 445                         pset_lock(pset);
 446                         processor->state = PROCESSOR_OFF_LINE;
 447                         pset_unlock(pset);
 448                         splx(s);
 449
 450                         return (result);
 451                 }
 452
 453                 s = splsched();
 454                 thread_lock(thread);
 455                 thread->bound_processor = processor;
 456                 processor->next_thread = thread;
 457                 thread->state = TH_RUN;
 458                 thread_unlock(thread);
 459                 splx(s);
 460
 461                 thread_deallocate(thread);
 462         }
 463
 464         if (processor->processor_self == IP_NULL)
 465                 ipc_processor_init(processor);
 466
 467         result = cpu_start(processor->cpu_id);
 468         if (result != KERN_SUCCESS) {
 469                 s = splsched();
 470                 pset_lock(pset);
 471                 processor->state = PROCESSOR_OFF_LINE;
 472                 pset_unlock(pset);
 473                 splx(s);
 474
 475                 return (result);
 476         }
 477
 478         ipc_processor_enable(processor);
 479
 480         return (KERN_SUCCESS);
 481 }
 482
 483 kern_return_t
 484 processor_exit(
 485         processor_t     processor)
 486 {
 487         if (processor == PROCESSOR_NULL)
 488                 return(KERN_INVALID_ARGUMENT);
 489
 490         return(processor_shutdown(processor));
 491 }
 492
 493 kern_return_t
 494 processor_control(
 495         processor_t             processor,
 496         processor_info_t        info,
 497         mach_msg_type_number_t  count)
 498 {
 499         if (processor == PROCESSOR_NULL)
 500                 return(KERN_INVALID_ARGUMENT);
 501
 502         return(cpu_control(processor->cpu_id, info, count));
 503 }
 504
 505 kern_return_t
 506 processor_set_create(
 507         __unused host_t         host,
 508         __unused processor_set_t        *new_set,
 509         __unused processor_set_t        *new_name)
 510 {
 511         return(KERN_FAILURE);
 512 }
 513
 514 kern_return_t
 515 processor_set_destroy(
 516         __unused processor_set_t        pset)
 517 {
 518         return(KERN_FAILURE);
 519 }
 520
 521 kern_return_t
 522 processor_get_assignment(
 523         processor_t     processor,
 524         processor_set_t *pset)
 525 {
 526         int state;
 527
 528         state = processor->state;
 529         if (state == PROCESSOR_SHUTDOWN || state == PROCESSOR_OFF_LINE)
 530                 return(KERN_FAILURE);
 531
 532         *pset = &pset0;
 533
 534         return(KERN_SUCCESS);
 535 }
 536
 537 kern_return_t
 538 processor_set_info(
 539         processor_set_t         pset,
 540         int                     flavor,
 541         host_t                  *host,
 542         processor_set_info_t    info,
 543         mach_msg_type_number_t  *count)
 544 {
 545         if (pset == PROCESSOR_SET_NULL)
 546                 return(KERN_INVALID_ARGUMENT);
 547
 548         if (flavor == PROCESSOR_SET_BASIC_INFO) {
 549                 register processor_set_basic_info_t     basic_info;
 550
 551                 if (*count < PROCESSOR_SET_BASIC_INFO_COUNT)
 552                         return(KERN_FAILURE);
 553
 554                 basic_info = (processor_set_basic_info_t) info;
 555                 basic_info->processor_count = processor_avail_count;
 556                 basic_info->default_policy = POLICY_TIMESHARE;
 557
 558                 *count = PROCESSOR_SET_BASIC_INFO_COUNT;
 559                 *host = &realhost;
 560                 return(KERN_SUCCESS);
 561         }
 562         else if (flavor == PROCESSOR_SET_TIMESHARE_DEFAULT) {
 563                 register policy_timeshare_base_t        ts_base;
 564
 565                 if (*count < POLICY_TIMESHARE_BASE_COUNT)
 566                         return(KERN_FAILURE);
 567
 568                 ts_base = (policy_timeshare_base_t) info;
 569                 ts_base->base_priority = BASEPRI_DEFAULT;
 570
 571                 *count = POLICY_TIMESHARE_BASE_COUNT;
 572                 *host = &realhost;
 573                 return(KERN_SUCCESS);
 574         }
 575         else if (flavor == PROCESSOR_SET_FIFO_DEFAULT) {
 576                 register policy_fifo_base_t             fifo_base;
 577
 578                 if (*count < POLICY_FIFO_BASE_COUNT)
 579                         return(KERN_FAILURE);
 580
 581                 fifo_base = (policy_fifo_base_t) info;
 582                 fifo_base->base_priority = BASEPRI_DEFAULT;
 583
 584                 *count = POLICY_FIFO_BASE_COUNT;
 585                 *host = &realhost;
 586                 return(KERN_SUCCESS);
 587         }
 588         else if (flavor == PROCESSOR_SET_RR_DEFAULT) {
 589                 register policy_rr_base_t               rr_base;
 590
 591                 if (*count < POLICY_RR_BASE_COUNT)
 592                         return(KERN_FAILURE);
 593
 594                 rr_base = (policy_rr_base_t) info;
 595                 rr_base->base_priority = BASEPRI_DEFAULT;
 596                 rr_base->quantum = 1;
 597
 598                 *count = POLICY_RR_BASE_COUNT;
 599                 *host = &realhost;
 600                 return(KERN_SUCCESS);
 601         }
 602         else if (flavor == PROCESSOR_SET_TIMESHARE_LIMITS) {
 603                 register policy_timeshare_limit_t       ts_limit;
 604
 605                 if (*count < POLICY_TIMESHARE_LIMIT_COUNT)
 606                         return(KERN_FAILURE);
 607
 608                 ts_limit = (policy_timeshare_limit_t) info;
 609                 ts_limit->max_priority = MAXPRI_KERNEL;
 610
 611                 *count = POLICY_TIMESHARE_LIMIT_COUNT;
 612                 *host = &realhost;
 613                 return(KERN_SUCCESS);
 614         }
 615         else if (flavor == PROCESSOR_SET_FIFO_LIMITS) {
 616                 register policy_fifo_limit_t            fifo_limit;
 617
 618                 if (*count < POLICY_FIFO_LIMIT_COUNT)
 619                         return(KERN_FAILURE);
 620
 621                 fifo_limit = (policy_fifo_limit_t) info;
 622                 fifo_limit->max_priority = MAXPRI_KERNEL;
 623
 624                 *count = POLICY_FIFO_LIMIT_COUNT;
 625                 *host = &realhost;
 626                 return(KERN_SUCCESS);
 627         }
 628         else if (flavor == PROCESSOR_SET_RR_LIMITS) {
 629                 register policy_rr_limit_t              rr_limit;
 630
 631                 if (*count < POLICY_RR_LIMIT_COUNT)
 632                         return(KERN_FAILURE);
 633
 634                 rr_limit = (policy_rr_limit_t) info;
 635                 rr_limit->max_priority = MAXPRI_KERNEL;
 636
 637                 *count = POLICY_RR_LIMIT_COUNT;
 638                 *host = &realhost;
 639                 return(KERN_SUCCESS);
 640         }
 641         else if (flavor == PROCESSOR_SET_ENABLED_POLICIES) {
 642                 register int                            *enabled;
 643
 644                 if (*count < (sizeof(*enabled)/sizeof(int)))
 645                         return(KERN_FAILURE);
 646
 647                 enabled = (int *) info;
 648                 *enabled = POLICY_TIMESHARE | POLICY_RR | POLICY_FIFO;
 649
 650                 *count = sizeof(*enabled)/sizeof(int);
 651                 *host = &realhost;
 652                 return(KERN_SUCCESS);
 653         }
 654
 655
 656         *host = HOST_NULL;
 657         return(KERN_INVALID_ARGUMENT);
 658 }
 659
 660 /*
 661  *      processor_set_statistics
 662  *
 663  *      Returns scheduling statistics for a processor set.
 664  */
 665 kern_return_t
 666 processor_set_statistics(
 667         processor_set_t         pset,
 668         int                     flavor,
 669         processor_set_info_t    info,
 670         mach_msg_type_number_t  *count)
 671 {
 672         if (pset == PROCESSOR_SET_NULL || pset != &pset0)
 673                 return (KERN_INVALID_PROCESSOR_SET);
 674
 675         if (flavor == PROCESSOR_SET_LOAD_INFO) {
 676                 register processor_set_load_info_t     load_info;
 677
 678                 if (*count < PROCESSOR_SET_LOAD_INFO_COUNT)
 679                         return(KERN_FAILURE);
 680
 681                 load_info = (processor_set_load_info_t) info;
 682
 683                 load_info->mach_factor = sched_mach_factor;
 684                 load_info->load_average = sched_load_average;
 685
 686                 load_info->task_count = tasks_count;
 687                 load_info->thread_count = threads_count;
 688
 689                 *count = PROCESSOR_SET_LOAD_INFO_COUNT;
 690                 return(KERN_SUCCESS);
 691         }
 692
 693         return(KERN_INVALID_ARGUMENT);
 694 }
 695
 696 /*
 697  *      processor_set_max_priority:
 698  *
 699  *      Specify max priority permitted on processor set.  This affects
 700  *      newly created and assigned threads.  Optionally change existing
 701  *      ones.
 702  */
 703 kern_return_t
 704 processor_set_max_priority(
 705         __unused processor_set_t        pset,
 706         __unused int                    max_priority,
 707         __unused boolean_t              change_threads)
 708 {
 709         return (KERN_INVALID_ARGUMENT);
 710 }
 711
 712 /*
 713  *      processor_set_policy_enable:
 714  *
 715  *      Allow indicated policy on processor set.
 716  */
 717
 718 kern_return_t
 719 processor_set_policy_enable(
 720         __unused processor_set_t        pset,
 721         __unused int                    policy)
 722 {
 723         return (KERN_INVALID_ARGUMENT);
 724 }
 725
 726 /*
 727  *      processor_set_policy_disable:
 728  *
 729  *      Forbid indicated policy on processor set.  Time sharing cannot
 730  *      be forbidden.
 731  */
 732 kern_return_t
 733 processor_set_policy_disable(
 734         __unused processor_set_t        pset,
 735         __unused int                    policy,
 736         __unused boolean_t              change_threads)
 737 {
 738         return (KERN_INVALID_ARGUMENT);
 739 }
 740
 741 #define THING_TASK      0
 742 #define THING_THREAD    1
 743
 744 /*
 745  *      processor_set_things:
 746  *
 747  *      Common internals for processor_set_{threads,tasks}
 748  */
 749 kern_return_t
 750 processor_set_things(
 751         processor_set_t                 pset,
 752         mach_port_t                             **thing_list,
 753         mach_msg_type_number_t  *count,
 754         int                                             type)
 755 {
 756         unsigned int actual;    /* this many things */
 757         unsigned int maxthings;
 758         unsigned int i;
 759
 760         vm_size_t size, size_needed;
 761         void  *addr;
 762
 763         if (pset == PROCESSOR_SET_NULL || pset != &pset0)
 764                 return (KERN_INVALID_ARGUMENT);
 765
 766         size = 0;
 767         addr = NULL;
 768
 769         for (;;) {
 770                 lck_mtx_lock(&tasks_threads_lock);
 771
 772                 if (type == THING_TASK)
 773                         maxthings = tasks_count;
 774                 else
 775                         maxthings = threads_count;
 776
 777                 /* do we have the memory we need? */
 778
 779                 size_needed = maxthings * sizeof (mach_port_t);
 780                 if (size_needed <= size)
 781                         break;
 782
 783                 /* unlock and allocate more memory */
 784                 lck_mtx_unlock(&tasks_threads_lock);
 785
 786                 if (size != 0)
 787                         kfree(addr, size);
 788
 789                 assert(size_needed > 0);
 790                 size = size_needed;
 791
 792                 addr = kalloc(size);
 793                 if (addr == 0)
 794                         return (KERN_RESOURCE_SHORTAGE);
 795         }
 796
 797         /* OK, have memory and the list locked */
 798
 799         actual = 0;
 800         switch (type) {
 801
 802         case THING_TASK: {
 803                 task_t          task, *task_list = (task_t *)addr;
 804
 805                 for (task = (task_t)queue_first(&tasks);
 806                                                 !queue_end(&tasks, (queue_entry_t)task);
 807                                                                 task = (task_t)queue_next(&task->tasks)) {
 808 #if defined(SECURE_KERNEL)
 809                         if (task != kernel_task) {
 810 #endif
 811                                 task_reference_internal(task);
 812                                 task_list[actual++] = task;
 813 #if defined(SECURE_KERNEL)
 814                         }
 815 #endif
 816                 }
 817
 818                 break;
 819         }
 820
 821         case THING_THREAD: {
 822                 thread_t        thread, *thread_list = (thread_t *)addr;
 823
 824                 for (thread = (thread_t)queue_first(&threads);
 825                                                 !queue_end(&threads, (queue_entry_t)thread);
 826                                                                 thread = (thread_t)queue_next(&thread->threads)) {
 827                         thread_reference_internal(thread);
 828                         thread_list[actual++] = thread;
 829                 }
 830
 831                 break;
 832         }
 833
 834         }
 835
 836         lck_mtx_unlock(&tasks_threads_lock);
 837
 838         if (actual < maxthings)
 839                 size_needed = actual * sizeof (mach_port_t);
 840
 841         if (actual == 0) {
 842                 /* no things, so return null pointer and deallocate memory */
 843                 *thing_list = NULL;
 844                 *count = 0;
 845
 846                 if (size != 0)
 847                         kfree(addr, size);
 848         }
 849         else {
 850                 /* if we allocated too much, must copy */
 851
 852                 if (size_needed < size) {
 853                         void *newaddr;
 854
 855                         newaddr = kalloc(size_needed);
 856                         if (newaddr == 0) {
 857                                 switch (type) {
 858
 859                                 case THING_TASK: {
 860                                         task_t          *task_list = (task_t *)addr;
 861
 862                                         for (i = 0; i < actual; i++)
 863                                                 task_deallocate(task_list[i]);
 864                                         break;
 865                                 }
 866
 867                                 case THING_THREAD: {
 868                                         thread_t        *thread_list = (thread_t *)addr;
 869
 870                                         for (i = 0; i < actual; i++)
 871                                                 thread_deallocate(thread_list[i]);
 872                                         break;
 873                                 }
 874
 875                                 }
 876
 877                                 kfree(addr, size);
 878                                 return (KERN_RESOURCE_SHORTAGE);
 879                         }
 880
 881                         bcopy((void *) addr, (void *) newaddr, size_needed);
 882                         kfree(addr, size);
 883                         addr = newaddr;
 884                 }
 885
 886                 *thing_list = (mach_port_t *)addr;
 887                 *count = actual;
 888
 889                 /* do the conversion that Mig should handle */
 890
 891                 switch (type) {
 892
 893                 case THING_TASK: {
 894                         task_t          *task_list = (task_t *)addr;
 895
 896                         for (i = 0; i < actual; i++)
 897                                 (*thing_list)[i] = convert_task_to_port(task_list[i]);
 898                         break;
 899                 }
 900
 901                 case THING_THREAD: {
 902                         thread_t        *thread_list = (thread_t *)addr;
 903
 904                         for (i = 0; i < actual; i++)
 905                                 (*thing_list)[i] = convert_thread_to_port(thread_list[i]);
 906                         break;
 907                 }
 908
 909                 }
 910         }
 911
 912         return (KERN_SUCCESS);
 913 }
 914
 915
 916 /*
 917  *      processor_set_tasks:
 918  *
 919  *      List all tasks in the processor set.
 920  */
 921 kern_return_t
 922 processor_set_tasks(
 923         processor_set_t         pset,
 924         task_array_t            *task_list,
 925         mach_msg_type_number_t  *count)
 926 {
 927     return(processor_set_things(pset, (mach_port_t **)task_list, count, THING_TASK));
 928 }
 929
 930 /*
 931  *      processor_set_threads:
 932  *
 933  *      List all threads in the processor set.
 934  */
 935 #if defined(SECURE_KERNEL)
 936 kern_return_t
 937 processor_set_threads(
 938         __unused processor_set_t                pset,
 939         __unused thread_array_t         *thread_list,
 940         __unused mach_msg_type_number_t *count)
 941 {
 942     return KERN_FAILURE;
 943 }
 944 #elif defined(CONFIG_EMBEDDED)
 945 kern_return_t
 946 processor_set_threads(
 947         __unused processor_set_t                pset,
 948         __unused thread_array_t         *thread_list,
 949         __unused mach_msg_type_number_t *count)
 950 {
 951     return KERN_NOT_SUPPORTED;
 952 }
 953 #else
 954 kern_return_t
 955 processor_set_threads(
 956         processor_set_t         pset,
 957         thread_array_t          *thread_list,
 958         mach_msg_type_number_t  *count)
 959 {
 960     return(processor_set_things(pset, (mach_port_t **)thread_list, count, THING_THREAD));
 961 }
 962 #endif
 963
 964 /*
 965  *      processor_set_policy_control
 966  *
 967  *      Controls the scheduling attributes governing the processor set.
 968  *      Allows control of enabled policies, and per-policy base and limit
 969  *      priorities.
 970  */
 971 kern_return_t
 972 processor_set_policy_control(
 973         __unused processor_set_t                pset,
 974         __unused int                            flavor,
 975         __unused processor_set_info_t   policy_info,
 976         __unused mach_msg_type_number_t count,
 977         __unused boolean_t                      change)
 978 {
 979         return (KERN_INVALID_ARGUMENT);
 980 }
 981
 982 #undef pset_deallocate
 983 void pset_deallocate(processor_set_t pset);
 984 void
 985 pset_deallocate(
 986 __unused processor_set_t        pset)
 987 {
 988         return;
 989 }
 990
 991 #undef pset_reference
 992 void pset_reference(processor_set_t pset);
 993 void
 994 pset_reference(
 995 __unused processor_set_t        pset)
 996 {
 997         return;
 998 }