33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/sysproto.h> 37#include <sys/kernel.h> 38#include <sys/lock.h> 39#include <sys/malloc.h> 40#include <sys/mutex.h> 41#include <sys/priv.h> 42#include <sys/proc.h> 43#include <sys/refcount.h> 44#include <sys/sched.h> 45#include <sys/smp.h> 46#include <sys/syscallsubr.h> 47#include <sys/cpuset.h> 48#include <sys/sx.h> 49#include <sys/refcount.h> 50#include <sys/queue.h> 51#include <sys/limits.h> 52#include <sys/bus.h> 53#include <sys/interrupt.h> 54 55#include <vm/uma.h> 56 57/* 58 * cpusets provide a mechanism for creating and manipulating sets of 59 * processors for the purpose of constraining the scheduling of threads to 60 * specific processors. 61 * 62 * Each process belongs to an identified set, by default this is set 1. Each 63 * thread may further restrict the cpus it may run on to a subset of this 64 * named set. This creates an anonymous set which other threads and processes 65 * may not join by number. 66 * 67 * The named set is referred to herein as the 'base' set to avoid ambiguity. 68 * This set is usually a child of a 'root' set while the anonymous set may 69 * simply be referred to as a mask. In the syscall api these are referred to 70 * as the ROOT, CPUSET, and MASK levels where CPUSET is called 'base' here. 71 * 72 * Threads inherit their set from their creator whether it be anonymous or 73 * not. This means that anonymous sets are immutable because they may be 74 * shared. To modify an anonymous set a new set is created with the desired 75 * mask and the same parent as the existing anonymous set. This gives the 76 * illusion of each thread having a private mask.A 77 * 78 * Via the syscall apis a user may ask to retrieve or modify the root, base, 79 * or mask that is discovered via a pid, tid, or setid. Modifying a set 80 * modifies all numbered and anonymous child sets to comply with the new mask. 81 * Modifying a pid or tid's mask applies only to that tid but must still 82 * exist within the assigned parent set. 83 * 84 * A thread may not be assigned to a a group seperate from other threads in 85 * the process. This is to remove ambiguity when the setid is queried with 86 * a pid argument. There is no other technical limitation. 87 * 88 * This somewhat complex arrangement is intended to make it easy for 89 * applications to query available processors and bind their threads to 90 * specific processors while also allowing administrators to dynamically 91 * reprovision by changing sets which apply to groups of processes. 92 * 93 * A simple application should not concern itself with sets at all and 94 * rather apply masks to its own threads via CPU_WHICH_TID and a -1 id 95 * meaning 'curthread'. It may query availble cpus for that tid with a 96 * getaffinity call using (CPU_LEVEL_CPUSET, CPU_WHICH_PID, -1, ...). 97 */ 98static uma_zone_t cpuset_zone; 99static struct mtx cpuset_lock; 100static struct setlist cpuset_ids; 101static struct unrhdr *cpuset_unr; 102static struct cpuset *cpuset_zero; 103 104cpuset_t *cpuset_root; 105 106/* 107 * Acquire a reference to a cpuset, all pointers must be tracked with refs. 108 */ 109struct cpuset * 110cpuset_ref(struct cpuset *set) 111{ 112 113 refcount_acquire(&set->cs_ref); 114 return (set); 115} 116 117/* 118 * Release a reference in a context where it is safe to allocte. 119 */ 120void 121cpuset_rel(struct cpuset *set) 122{ 123 cpusetid_t id; 124 125 if (refcount_release(&set->cs_ref) == 0) 126 return; 127 mtx_lock_spin(&cpuset_lock); 128 LIST_REMOVE(set, cs_siblings); 129 id = set->cs_id; 130 if (id != CPUSET_INVALID) 131 LIST_REMOVE(set, cs_link); 132 mtx_unlock_spin(&cpuset_lock); 133 cpuset_rel(set->cs_parent); 134 uma_zfree(cpuset_zone, set); 135 if (id != CPUSET_INVALID) 136 free_unr(cpuset_unr, id); 137} 138 139/* 140 * Deferred release must be used when in a context that is not safe to 141 * allocate/free. This places any unreferenced sets on the list 'head'. 142 */ 143static void 144cpuset_rel_defer(struct setlist *head, struct cpuset *set) 145{ 146 147 if (refcount_release(&set->cs_ref) == 0) 148 return; 149 mtx_lock_spin(&cpuset_lock); 150 LIST_REMOVE(set, cs_siblings); 151 if (set->cs_id != CPUSET_INVALID) 152 LIST_REMOVE(set, cs_link); 153 LIST_INSERT_HEAD(head, set, cs_link); 154 mtx_unlock_spin(&cpuset_lock); 155} 156 157/* 158 * Complete a deferred release. Removes the set from the list provided to 159 * cpuset_rel_defer. 160 */ 161static void 162cpuset_rel_complete(struct cpuset *set) 163{ 164 LIST_REMOVE(set, cs_link); 165 cpuset_rel(set->cs_parent); 166 uma_zfree(cpuset_zone, set); 167} 168 169/* 170 * Find a set based on an id. Returns it with a ref. 171 */ 172static struct cpuset * 173cpuset_lookup(cpusetid_t setid) 174{ 175 struct cpuset *set; 176 177 if (setid == CPUSET_INVALID) 178 return (NULL); 179 mtx_lock_spin(&cpuset_lock); 180 LIST_FOREACH(set, &cpuset_ids, cs_link) 181 if (set->cs_id == setid) 182 break; 183 if (set) 184 cpuset_ref(set); 185 mtx_unlock_spin(&cpuset_lock); 186 return (set); 187} 188 189/* 190 * Create a set in the space provided in 'set' with the provided parameters. 191 * The set is returned with a single ref. May return EDEADLK if the set 192 * will have no valid cpu based on restrictions from the parent. 193 */ 194static int 195_cpuset_create(struct cpuset *set, struct cpuset *parent, cpuset_t *mask, 196 cpusetid_t id) 197{ 198 199 if (!CPU_OVERLAP(&parent->cs_mask, mask)) 200 return (EDEADLK); 201 CPU_COPY(mask, &set->cs_mask); 202 LIST_INIT(&set->cs_children); 203 refcount_init(&set->cs_ref, 1); 204 set->cs_flags = 0; 205 mtx_lock_spin(&cpuset_lock); 206 CPU_AND(mask, &parent->cs_mask); 207 set->cs_id = id; 208 set->cs_parent = cpuset_ref(parent); 209 LIST_INSERT_HEAD(&parent->cs_children, set, cs_siblings); 210 if (set->cs_id != CPUSET_INVALID) 211 LIST_INSERT_HEAD(&cpuset_ids, set, cs_link); 212 mtx_unlock_spin(&cpuset_lock); 213 214 return (0); 215} 216 217/* 218 * Create a new non-anonymous set with the requested parent and mask. May 219 * return failures if the mask is invalid or a new number can not be 220 * allocated. 221 */ 222static int 223cpuset_create(struct cpuset **setp, struct cpuset *parent, cpuset_t *mask) 224{ 225 struct cpuset *set; 226 cpusetid_t id; 227 int error; 228 229 id = alloc_unr(cpuset_unr); 230 if (id == -1) 231 return (ENFILE); 232 *setp = set = uma_zalloc(cpuset_zone, M_WAITOK); 233 error = _cpuset_create(set, parent, mask, id); 234 if (error == 0) 235 return (0); 236 free_unr(cpuset_unr, id); 237 uma_zfree(cpuset_zone, set); 238 239 return (error); 240} 241 242/* 243 * Recursively check for errors that would occur from applying mask to 244 * the tree of sets starting at 'set'. Checks for sets that would become 245 * empty as well as RDONLY flags. 246 */ 247static int 248cpuset_testupdate(struct cpuset *set, cpuset_t *mask) 249{ 250 struct cpuset *nset; 251 cpuset_t newmask; 252 int error; 253 254 mtx_assert(&cpuset_lock, MA_OWNED); 255 if (set->cs_flags & CPU_SET_RDONLY) 256 return (EPERM); 257 if (!CPU_OVERLAP(&set->cs_mask, mask)) 258 return (EDEADLK); 259 CPU_COPY(&set->cs_mask, &newmask); 260 CPU_AND(&newmask, mask); 261 error = 0; 262 LIST_FOREACH(nset, &set->cs_children, cs_siblings) 263 if ((error = cpuset_testupdate(nset, &newmask)) != 0) 264 break; 265 return (error); 266} 267 268/* 269 * Applies the mask 'mask' without checking for empty sets or permissions. 270 */ 271static void 272cpuset_update(struct cpuset *set, cpuset_t *mask) 273{ 274 struct cpuset *nset; 275 276 mtx_assert(&cpuset_lock, MA_OWNED); 277 CPU_AND(&set->cs_mask, mask); 278 LIST_FOREACH(nset, &set->cs_children, cs_siblings) 279 cpuset_update(nset, &set->cs_mask); 280 281 return; 282} 283 284/* 285 * Modify the set 'set' to use a copy of the mask provided. Apply this new 286 * mask to restrict all children in the tree. Checks for validity before 287 * applying the changes. 288 */ 289static int 290cpuset_modify(struct cpuset *set, cpuset_t *mask) 291{ 292 struct cpuset *root; 293 int error; 294 295 error = suser(curthread); 296 if (error) 297 return (error); 298 /* 299 * Verify that we have access to this set of 300 * cpus. 301 */ 302 root = set->cs_parent; 303 if (root && !CPU_SUBSET(&root->cs_mask, mask)) 304 return (EINVAL); 305 mtx_lock_spin(&cpuset_lock); 306 error = cpuset_testupdate(set, mask); 307 if (error) 308 goto out; 309 cpuset_update(set, mask); 310 CPU_COPY(mask, &set->cs_mask); 311out: 312 mtx_unlock_spin(&cpuset_lock); 313 314 return (error); 315} 316 317/* 318 * Walks up the tree from 'set' to find the root. Returns the root 319 * referenced. 320 */ 321static struct cpuset * 322cpuset_refroot(struct cpuset *set) 323{ 324 325 for (; set->cs_parent != NULL; set = set->cs_parent) 326 if (set->cs_flags & CPU_SET_ROOT) 327 break; 328 cpuset_ref(set); 329 330 return (set); 331} 332 333/* 334 * Find the first non-anonymous set starting from 'set'. Returns this set 335 * referenced. May return the passed in set with an extra ref if it is 336 * not anonymous. 337 */ 338static struct cpuset * 339cpuset_refbase(struct cpuset *set) 340{ 341 342 if (set->cs_id == CPUSET_INVALID) 343 set = set->cs_parent; 344 cpuset_ref(set); 345 346 return (set); 347} 348 349/* 350 * Resolve the 'which' parameter of several cpuset apis. 351 * 352 * For WHICH_PID and WHICH_TID return a locked proc and valid proc/tid. Also 353 * checks for permission via p_cansched(). 354 * 355 * For WHICH_SET returns a valid set with a new reference. 356 * 357 * -1 may be supplied for any argument to mean the current proc/thread or 358 * the base set of the current thread. May fail with ESRCH/EPERM. 359 */ 360static int 361cpuset_which(cpuwhich_t which, id_t id, struct proc **pp, struct thread **tdp, 362 struct cpuset **setp) 363{ 364 struct cpuset *set; 365 struct thread *td; 366 struct proc *p; 367 int error; 368 369 *pp = p = NULL; 370 *tdp = td = NULL; 371 *setp = set = NULL; 372 switch (which) { 373 case CPU_WHICH_PID: 374 if (id == -1) { 375 PROC_LOCK(curproc); 376 p = curproc; 377 break; 378 } 379 if ((p = pfind(id)) == NULL) 380 return (ESRCH); 381 break; 382 case CPU_WHICH_TID: 383 if (id == -1) { 384 PROC_LOCK(curproc); 385 p = curproc; 386 td = curthread; 387 break; 388 } 389 sx_slock(&allproc_lock); 390 FOREACH_PROC_IN_SYSTEM(p) { 391 PROC_LOCK(p); 392 FOREACH_THREAD_IN_PROC(p, td) 393 if (td->td_tid == id) 394 break; 395 if (td != NULL) 396 break; 397 PROC_UNLOCK(p); 398 } 399 sx_sunlock(&allproc_lock); 400 if (td == NULL) 401 return (ESRCH); 402 break; 403 case CPU_WHICH_CPUSET: 404 if (id == -1) { 405 thread_lock(curthread); 406 set = cpuset_refbase(curthread->td_cpuset); 407 thread_unlock(curthread); 408 } else 409 set = cpuset_lookup(id); 410 if (set) { 411 *setp = set; 412 return (0); 413 } 414 return (ESRCH); 415 default: 416 return (EINVAL); 417 } 418 error = p_cansched(curthread, p); 419 if (error) { 420 PROC_UNLOCK(p); 421 return (error); 422 } 423 if (td == NULL) 424 td = FIRST_THREAD_IN_PROC(p); 425 *pp = p; 426 *tdp = td; 427 return (0); 428} 429 430/* 431 * Create an anonymous set with the provided mask in the space provided by 432 * 'fset'. If the passed in set is anonymous we use its parent otherwise 433 * the new set is a child of 'set'. 434 */ 435static int 436cpuset_shadow(struct cpuset *set, struct cpuset *fset, cpuset_t *mask) 437{ 438 struct cpuset *parent; 439 440 if (set->cs_id == CPUSET_INVALID) 441 parent = set->cs_parent; 442 else 443 parent = set; 444 if (!CPU_SUBSET(&parent->cs_mask, mask)) 445 return (EDEADLK); 446 return (_cpuset_create(fset, parent, mask, CPUSET_INVALID)); 447} 448 449/* 450 * Handle two cases for replacing the base set or mask of an entire process. 451 * 452 * 1) Set is non-null and mask is null. This reparents all anonymous sets 453 * to the provided set and replaces all non-anonymous td_cpusets with the 454 * provided set. 455 * 2) Mask is non-null and set is null. This replaces or creates anonymous 456 * sets for every thread with the existing base as a parent. 457 * 458 * This is overly complicated because we can't allocate while holding a 459 * spinlock and spinlocks must be held while changing and examining thread 460 * state. 461 */ 462static int 463cpuset_setproc(pid_t pid, struct cpuset *set, cpuset_t *mask) 464{ 465 struct setlist freelist; 466 struct setlist droplist; 467 struct cpuset *tdset; 468 struct cpuset *nset; 469 struct thread *td; 470 struct proc *p; 471 int threads; 472 int nfree; 473 int error; 474 /* 475 * The algorithm requires two passes due to locking considerations. 476 * 477 * 1) Lookup the process and acquire the locks in the required order. 478 * 2) If enough cpusets have not been allocated release the locks and 479 * allocate them. Loop. 480 */ 481 LIST_INIT(&freelist); 482 LIST_INIT(&droplist); 483 nfree = 0; 484 for (;;) { 485 error = cpuset_which(CPU_WHICH_PID, pid, &p, &td, &nset); 486 if (error) 487 goto out; 488 if (nfree >= p->p_numthreads) 489 break; 490 threads = p->p_numthreads; 491 PROC_UNLOCK(p); 492 for (; nfree < threads; nfree++) { 493 nset = uma_zalloc(cpuset_zone, M_WAITOK); 494 LIST_INSERT_HEAD(&freelist, nset, cs_link); 495 } 496 } 497 PROC_LOCK_ASSERT(p, MA_OWNED); 498 /* 499 * Now that the appropriate locks are held and we have enough cpusets, 500 * make sure the operation will succeed before applying changes. The 501 * proc lock prevents td_cpuset from changing between calls. 502 */ 503 error = 0; 504 FOREACH_THREAD_IN_PROC(p, td) { 505 thread_lock(td); 506 tdset = td->td_cpuset; 507 /* 508 * Verify that a new mask doesn't specify cpus outside of 509 * the set the thread is a member of. 510 */ 511 if (mask) { 512 if (tdset->cs_id == CPUSET_INVALID) 513 tdset = tdset->cs_parent; 514 if (!CPU_SUBSET(&tdset->cs_mask, mask)) 515 error = EDEADLK; 516 /* 517 * Verify that a new set won't leave an existing thread 518 * mask without a cpu to run on. It can, however, restrict 519 * the set. 520 */ 521 } else if (tdset->cs_id == CPUSET_INVALID) { 522 if (!CPU_OVERLAP(&set->cs_mask, &tdset->cs_mask)) 523 error = EDEADLK; 524 } 525 thread_unlock(td); 526 if (error) 527 goto unlock_out; 528 } 529 /* 530 * Replace each thread's cpuset while using deferred release. We 531 * must do this because the thread lock must be held while operating 532 * on the thread and this limits the type of operations allowed. 533 */ 534 FOREACH_THREAD_IN_PROC(p, td) { 535 thread_lock(td); 536 /* 537 * If we presently have an anonymous set or are applying a 538 * mask we must create an anonymous shadow set. That is 539 * either parented to our existing base or the supplied set. 540 * 541 * If we have a base set with no anonymous shadow we simply 542 * replace it outright. 543 */ 544 tdset = td->td_cpuset; 545 if (tdset->cs_id == CPUSET_INVALID || mask) { 546 nset = LIST_FIRST(&freelist); 547 LIST_REMOVE(nset, cs_link); 548 if (mask) 549 error = cpuset_shadow(tdset, nset, mask); 550 else 551 error = _cpuset_create(nset, set, 552 &tdset->cs_mask, CPUSET_INVALID); 553 if (error) { 554 LIST_INSERT_HEAD(&freelist, nset, cs_link); 555 thread_unlock(td); 556 break; 557 } 558 } else 559 nset = cpuset_ref(set); 560 cpuset_rel_defer(&droplist, tdset); 561 td->td_cpuset = nset; 562 sched_affinity(td); 563 thread_unlock(td); 564 } 565unlock_out: 566 PROC_UNLOCK(p); 567out: 568 while ((nset = LIST_FIRST(&droplist)) != NULL) 569 cpuset_rel_complete(nset); 570 while ((nset = LIST_FIRST(&freelist)) != NULL) { 571 LIST_REMOVE(nset, cs_link); 572 uma_zfree(cpuset_zone, nset); 573 } 574 return (error); 575} 576 577/* 578 * Apply an anonymous mask to a single thread. 579 */ 580int 581cpuset_setthread(lwpid_t id, cpuset_t *mask) 582{ 583 struct cpuset *nset; 584 struct cpuset *set; 585 struct thread *td; 586 struct proc *p; 587 int error; 588 589 nset = uma_zalloc(cpuset_zone, M_WAITOK); 590 error = cpuset_which(CPU_WHICH_TID, id, &p, &td, &set); 591 if (error) 592 goto out; 593 set = NULL; 594 thread_lock(td); 595 error = cpuset_shadow(td->td_cpuset, nset, mask); 596 if (error == 0) { 597 set = td->td_cpuset; 598 td->td_cpuset = nset; 599 sched_affinity(td); 600 nset = NULL; 601 } 602 thread_unlock(td); 603 PROC_UNLOCK(p); 604 if (set) 605 cpuset_rel(set); 606out: 607 if (nset) 608 uma_zfree(cpuset_zone, nset); 609 return (error); 610} 611 612/* 613 * Creates the cpuset for thread0. We make two sets: 614 * 615 * 0 - The root set which should represent all valid processors in the 616 * system. It is initially created with a mask of all processors 617 * because we don't know what processors are valid until cpuset_init() 618 * runs. This set is immutable. 619 * 1 - The default set which all processes are a member of until changed. 620 * This allows an administrator to move all threads off of given cpus to 621 * dedicate them to high priority tasks or save power etc. 622 */ 623struct cpuset * 624cpuset_thread0(void) 625{ 626 struct cpuset *set; 627 int error; 628 629 cpuset_zone = uma_zcreate("cpuset", sizeof(struct cpuset), NULL, NULL, 630 NULL, NULL, UMA_ALIGN_PTR, 0); 631 mtx_init(&cpuset_lock, "cpuset", NULL, MTX_SPIN | MTX_RECURSE); 632 /* 633 * Create the root system set for the whole machine. Doesn't use 634 * cpuset_create() due to NULL parent. 635 */ 636 set = uma_zalloc(cpuset_zone, M_WAITOK | M_ZERO); 637 set->cs_mask.__bits[0] = -1; 638 LIST_INIT(&set->cs_children); 639 LIST_INSERT_HEAD(&cpuset_ids, set, cs_link); 640 set->cs_ref = 1; 641 set->cs_flags = CPU_SET_ROOT; 642 cpuset_zero = set; 643 cpuset_root = &set->cs_mask; 644 /* 645 * Now derive a default, modifiable set from that to give out. 646 */ 647 set = uma_zalloc(cpuset_zone, M_WAITOK); 648 error = _cpuset_create(set, cpuset_zero, &cpuset_zero->cs_mask, 1); 649 KASSERT(error == 0, ("Error creating default set: %d\n", error)); 650 /* 651 * Initialize the unit allocator. 0 and 1 are allocated above. 652 */ 653 cpuset_unr = new_unrhdr(2, INT_MAX, NULL); 654 655 return (set); 656} 657 658/* 659 * This is called once the final set of system cpus is known. Modifies 660 * the root set and all children and mark the root readonly. 661 */ 662static void 663cpuset_init(void *arg) 664{ 665 cpuset_t mask; 666 667 CPU_ZERO(&mask); 668#ifdef SMP 669 mask.__bits[0] = all_cpus; 670#else 671 mask.__bits[0] = 1; 672#endif 673 if (cpuset_modify(cpuset_zero, &mask)) 674 panic("Can't set initial cpuset mask.\n"); 675 cpuset_zero->cs_flags |= CPU_SET_RDONLY; 676} 677SYSINIT(cpuset, SI_SUB_SMP, SI_ORDER_ANY, cpuset_init, NULL); 678 679#ifndef _SYS_SYSPROTO_H_ 680struct cpuset_args { 681 cpusetid_t *setid; 682}; 683#endif 684int 685cpuset(struct thread *td, struct cpuset_args *uap) 686{ 687 struct cpuset *root; 688 struct cpuset *set; 689 int error; 690 691 thread_lock(td); 692 root = cpuset_refroot(td->td_cpuset); 693 thread_unlock(td); 694 error = cpuset_create(&set, root, &root->cs_mask); 695 cpuset_rel(root); 696 if (error) 697 return (error); 698 error = copyout(&set->cs_id, uap->setid, sizeof(set->cs_id)); 699 if (error == 0) 700 error = cpuset_setproc(-1, set, NULL); 701 cpuset_rel(set); 702 return (error); 703} 704 705#ifndef _SYS_SYSPROTO_H_ 706struct cpuset_setid_args { 707 cpuwhich_t which; 708 id_t id; 709 cpusetid_t setid; 710}; 711#endif 712int 713cpuset_setid(struct thread *td, struct cpuset_setid_args *uap) 714{ 715 struct cpuset *set; 716 int error; 717 718 /* 719 * Presently we only support per-process sets. 720 */ 721 if (uap->which != CPU_WHICH_PID) 722 return (EINVAL); 723 set = cpuset_lookup(uap->setid); 724 if (set == NULL) 725 return (ESRCH); 726 error = cpuset_setproc(uap->id, set, NULL); 727 cpuset_rel(set); 728 return (error); 729} 730 731#ifndef _SYS_SYSPROTO_H_ 732struct cpuset_getid_args { 733 cpulevel_t level; 734 cpuwhich_t which; 735 id_t id; 736 cpusetid_t *setid; 737#endif 738int 739cpuset_getid(struct thread *td, struct cpuset_getid_args *uap) 740{ 741 struct cpuset *nset; 742 struct cpuset *set; 743 struct thread *ttd; 744 struct proc *p; 745 cpusetid_t id; 746 int error; 747 748 if (uap->level == CPU_LEVEL_WHICH && uap->which != CPU_WHICH_CPUSET) 749 return (EINVAL); 750 error = cpuset_which(uap->which, uap->id, &p, &ttd, &set); 751 if (error) 752 return (error); 753 switch (uap->which) { 754 case CPU_WHICH_TID: 755 case CPU_WHICH_PID: 756 thread_lock(ttd); 757 set = cpuset_refbase(ttd->td_cpuset); 758 thread_unlock(ttd); 759 PROC_UNLOCK(p); 760 break; 761 case CPU_WHICH_CPUSET: 762 break; 763 } 764 switch (uap->level) { 765 case CPU_LEVEL_ROOT: 766 nset = cpuset_refroot(set); 767 cpuset_rel(set); 768 set = nset; 769 break; 770 case CPU_LEVEL_CPUSET: 771 break; 772 case CPU_LEVEL_WHICH: 773 break; 774 } 775 id = set->cs_id; 776 cpuset_rel(set); 777 if (error == 0) 778 error = copyout(&id, uap->setid, sizeof(id)); 779 780 return (error); 781} 782 783#ifndef _SYS_SYSPROTO_H_ 784struct cpuset_getaffinity_args { 785 cpulevel_t level; 786 cpuwhich_t which; 787 id_t id; 788 size_t cpusetsize; 789 cpuset_t *mask; 790}; 791#endif 792int 793cpuset_getaffinity(struct thread *td, struct cpuset_getaffinity_args *uap) 794{ 795 struct thread *ttd; 796 struct cpuset *nset; 797 struct cpuset *set; 798 struct proc *p; 799 cpuset_t *mask; 800 int error; 801 size_t size; 802 803 if (uap->cpusetsize < sizeof(cpuset_t) || 804 uap->cpusetsize * NBBY > CPU_MAXSIZE) 805 return (ERANGE); 806 size = uap->cpusetsize; 807 mask = malloc(size, M_TEMP, M_WAITOK | M_ZERO); 808 error = cpuset_which(uap->which, uap->id, &p, &ttd, &set); 809 if (error) 810 goto out; 811 switch (uap->level) { 812 case CPU_LEVEL_ROOT: 813 case CPU_LEVEL_CPUSET: 814 switch (uap->which) { 815 case CPU_WHICH_TID: 816 case CPU_WHICH_PID: 817 thread_lock(ttd); 818 set = cpuset_ref(ttd->td_cpuset); 819 thread_unlock(ttd); 820 break; 821 case CPU_WHICH_CPUSET: 822 break; 823 } 824 if (uap->level == CPU_LEVEL_ROOT) 825 nset = cpuset_refroot(set); 826 else 827 nset = cpuset_refbase(set); 828 CPU_COPY(&nset->cs_mask, mask); 829 cpuset_rel(nset); 830 break; 831 case CPU_LEVEL_WHICH: 832 switch (uap->which) { 833 case CPU_WHICH_TID: 834 thread_lock(ttd); 835 CPU_COPY(&ttd->td_cpuset->cs_mask, mask); 836 thread_unlock(ttd); 837 break; 838 case CPU_WHICH_PID: 839 FOREACH_THREAD_IN_PROC(p, ttd) { 840 thread_lock(ttd); 841 CPU_OR(mask, &ttd->td_cpuset->cs_mask); 842 thread_unlock(ttd); 843 } 844 break; 845 case CPU_WHICH_CPUSET: 846 CPU_COPY(&set->cs_mask, mask); 847 break; 848 } 849 break; 850 default: 851 error = EINVAL; 852 break; 853 } 854 if (set) 855 cpuset_rel(set); 856 if (p) 857 PROC_UNLOCK(p); 858 if (error == 0) 859 error = copyout(mask, uap->mask, size); 860out: 861 free(mask, M_TEMP); 862 return (error); 863} 864 865#ifndef _SYS_SYSPROTO_H_ 866struct cpuset_setaffinity_args { 867 cpulevel_t level; 868 cpuwhich_t which; 869 id_t id; 870 size_t cpusetsize; 871 const cpuset_t *mask; 872}; 873#endif 874int 875cpuset_setaffinity(struct thread *td, struct cpuset_setaffinity_args *uap) 876{ 877 struct cpuset *nset; 878 struct cpuset *set; 879 struct thread *ttd; 880 struct proc *p; 881 cpuset_t *mask; 882 int error; 883 884 if (uap->cpusetsize < sizeof(cpuset_t) || 885 uap->cpusetsize * NBBY > CPU_MAXSIZE) 886 return (ERANGE); 887 mask = malloc(uap->cpusetsize, M_TEMP, M_WAITOK | M_ZERO); 888 error = copyin(uap->mask, mask, uap->cpusetsize); 889 if (error) 890 goto out; 891 /* 892 * Verify that no high bits are set. 893 */ 894 if (uap->cpusetsize > sizeof(cpuset_t)) { 895 char *end; 896 char *cp; 897 898 end = cp = (char *)&mask->__bits; 899 end += uap->cpusetsize; 900 cp += sizeof(cpuset_t); 901 while (cp != end) 902 if (*cp++ != 0) { 903 error = EINVAL; 904 goto out; 905 } 906 907 } 908 switch (uap->level) { 909 case CPU_LEVEL_ROOT: 910 case CPU_LEVEL_CPUSET: 911 error = cpuset_which(uap->which, uap->id, &p, &ttd, &set); 912 if (error) 913 break; 914 switch (uap->which) { 915 case CPU_WHICH_TID: 916 case CPU_WHICH_PID: 917 thread_lock(ttd); 918 set = cpuset_ref(ttd->td_cpuset); 919 thread_unlock(ttd); 920 PROC_UNLOCK(p); 921 break; 922 case CPU_WHICH_CPUSET: 923 break; 924 } 925 if (uap->level == CPU_LEVEL_ROOT) 926 nset = cpuset_refroot(set); 927 else 928 nset = cpuset_refbase(set); 929 error = cpuset_modify(nset, mask); 930 cpuset_rel(nset); 931 cpuset_rel(set); 932 break; 933 case CPU_LEVEL_WHICH: 934 switch (uap->which) { 935 case CPU_WHICH_TID: 936 error = cpuset_setthread(uap->id, mask); 937 break; 938 case CPU_WHICH_PID: 939 error = cpuset_setproc(uap->id, NULL, mask); 940 break; 941 case CPU_WHICH_CPUSET: 942 error = cpuset_which(CPU_WHICH_CPUSET, uap->id, &p, 943 &ttd, &set); 944 if (error == 0) { 945 error = cpuset_modify(set, mask); 946 cpuset_rel(set); 947 } 948 break; 949 default: 950 error = EINVAL; 951 break; 952 } 953 break; 954 default: 955 error = EINVAL; 956 break; 957 } 958out: 959 free(mask, M_TEMP); 960 return (error); 961}
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