kern_umtx.c revision 162536
1139804Simp/*- 2139013Sdavidxu * Copyright (c) 2004, David Xu <davidxu@freebsd.org> 3112904Sjeff * Copyright (c) 2002, Jeffrey Roberson <jeff@freebsd.org> 4112904Sjeff * All rights reserved. 5112904Sjeff * 6112904Sjeff * Redistribution and use in source and binary forms, with or without 7112904Sjeff * modification, are permitted provided that the following conditions 8112904Sjeff * are met: 9112904Sjeff * 1. Redistributions of source code must retain the above copyright 10112904Sjeff * notice unmodified, this list of conditions, and the following 11112904Sjeff * disclaimer. 12112904Sjeff * 2. Redistributions in binary form must reproduce the above copyright 13112904Sjeff * notice, this list of conditions and the following disclaimer in the 14112904Sjeff * documentation and/or other materials provided with the distribution. 15112904Sjeff * 16112904Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17112904Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18112904Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19112904Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20112904Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21112904Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22112904Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23112904Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24112904Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25112904Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26112904Sjeff */ 27112904Sjeff 28116182Sobrien#include <sys/cdefs.h> 29116182Sobrien__FBSDID("$FreeBSD: head/sys/kern/kern_umtx.c 162536 2006-09-22 00:52:54Z davidxu $"); 30116182Sobrien 31162536Sdavidxu#include "opt_compat.h" 32112904Sjeff#include <sys/param.h> 33112904Sjeff#include <sys/kernel.h> 34131431Smarcel#include <sys/limits.h> 35112904Sjeff#include <sys/lock.h> 36115765Sjeff#include <sys/malloc.h> 37112904Sjeff#include <sys/mutex.h> 38112904Sjeff#include <sys/proc.h> 39161678Sdavidxu#include <sys/sched.h> 40161678Sdavidxu#include <sys/sysctl.h> 41112904Sjeff#include <sys/sysent.h> 42112904Sjeff#include <sys/systm.h> 43112904Sjeff#include <sys/sysproto.h> 44139013Sdavidxu#include <sys/eventhandler.h> 45112904Sjeff#include <sys/umtx.h> 46112904Sjeff 47139013Sdavidxu#include <vm/vm.h> 48139013Sdavidxu#include <vm/vm_param.h> 49139013Sdavidxu#include <vm/pmap.h> 50139013Sdavidxu#include <vm/vm_map.h> 51139013Sdavidxu#include <vm/vm_object.h> 52139013Sdavidxu 53162536Sdavidxu#ifdef COMPAT_IA32 54162536Sdavidxu#include <compat/freebsd32/freebsd32_proto.h> 55162536Sdavidxu#endif 56162536Sdavidxu 57161678Sdavidxu#define TYPE_SIMPLE_LOCK 0 58161678Sdavidxu#define TYPE_SIMPLE_WAIT 1 59161678Sdavidxu#define TYPE_NORMAL_UMUTEX 2 60161678Sdavidxu#define TYPE_PI_UMUTEX 3 61161678Sdavidxu#define TYPE_PP_UMUTEX 4 62161678Sdavidxu#define TYPE_CV 5 63139013Sdavidxu 64161678Sdavidxu/* Key to represent a unique userland synchronous object */ 65139013Sdavidxustruct umtx_key { 66161678Sdavidxu int hash; 67139013Sdavidxu int type; 68161678Sdavidxu int shared; 69139013Sdavidxu union { 70139013Sdavidxu struct { 71139013Sdavidxu vm_object_t object; 72161678Sdavidxu uintptr_t offset; 73139013Sdavidxu } shared; 74139013Sdavidxu struct { 75161678Sdavidxu struct vmspace *vs; 76161678Sdavidxu uintptr_t addr; 77139013Sdavidxu } private; 78139013Sdavidxu struct { 79161678Sdavidxu void *a; 80161678Sdavidxu uintptr_t b; 81139013Sdavidxu } both; 82139013Sdavidxu } info; 83139013Sdavidxu}; 84139013Sdavidxu 85161678Sdavidxu/* Priority inheritance mutex info. */ 86161678Sdavidxustruct umtx_pi { 87161678Sdavidxu /* Owner thread */ 88161678Sdavidxu struct thread *pi_owner; 89161678Sdavidxu 90161678Sdavidxu /* Reference count */ 91161678Sdavidxu int pi_refcount; 92161678Sdavidxu 93161678Sdavidxu /* List entry to link umtx holding by thread */ 94161678Sdavidxu TAILQ_ENTRY(umtx_pi) pi_link; 95161678Sdavidxu 96161678Sdavidxu /* List entry in hash */ 97161678Sdavidxu TAILQ_ENTRY(umtx_pi) pi_hashlink; 98161678Sdavidxu 99161678Sdavidxu /* List for waiters */ 100161678Sdavidxu TAILQ_HEAD(,umtx_q) pi_blocked; 101161678Sdavidxu 102161678Sdavidxu /* Identify a userland lock object */ 103161678Sdavidxu struct umtx_key pi_key; 104161678Sdavidxu}; 105161678Sdavidxu 106161678Sdavidxu/* A userland synchronous object user. */ 107115765Sjeffstruct umtx_q { 108161678Sdavidxu /* Linked list for the hash. */ 109161678Sdavidxu TAILQ_ENTRY(umtx_q) uq_link; 110161678Sdavidxu 111161678Sdavidxu /* Umtx key. */ 112161678Sdavidxu struct umtx_key uq_key; 113161678Sdavidxu 114161678Sdavidxu /* Umtx flags. */ 115161678Sdavidxu int uq_flags; 116161678Sdavidxu#define UQF_UMTXQ 0x0001 117161678Sdavidxu 118161678Sdavidxu /* The thread waits on. */ 119161678Sdavidxu struct thread *uq_thread; 120161678Sdavidxu 121161678Sdavidxu /* 122161678Sdavidxu * Blocked on PI mutex. read can use chain lock 123161678Sdavidxu * or sched_lock, write must have both chain lock and 124161678Sdavidxu * sched_lock being hold. 125161678Sdavidxu */ 126161678Sdavidxu struct umtx_pi *uq_pi_blocked; 127161678Sdavidxu 128161678Sdavidxu /* On blocked list */ 129161678Sdavidxu TAILQ_ENTRY(umtx_q) uq_lockq; 130161678Sdavidxu 131161678Sdavidxu /* Thread contending with us */ 132161678Sdavidxu TAILQ_HEAD(,umtx_pi) uq_pi_contested; 133161678Sdavidxu 134161742Sdavidxu /* Inherited priority from PP mutex */ 135161678Sdavidxu u_char uq_inherited_pri; 136115765Sjeff}; 137115765Sjeff 138161678SdavidxuTAILQ_HEAD(umtxq_head, umtx_q); 139161678Sdavidxu 140161678Sdavidxu/* Userland lock object's wait-queue chain */ 141138224Sdavidxustruct umtxq_chain { 142161678Sdavidxu /* Lock for this chain. */ 143161678Sdavidxu struct mtx uc_lock; 144161678Sdavidxu 145161678Sdavidxu /* List of sleep queues. */ 146161678Sdavidxu struct umtxq_head uc_queue; 147161678Sdavidxu 148161678Sdavidxu /* Busy flag */ 149161678Sdavidxu char uc_busy; 150161678Sdavidxu 151161678Sdavidxu /* Chain lock waiters */ 152158377Sdavidxu int uc_waiters; 153161678Sdavidxu 154161678Sdavidxu /* All PI in the list */ 155161678Sdavidxu TAILQ_HEAD(,umtx_pi) uc_pi_list; 156138224Sdavidxu}; 157115765Sjeff 158161678Sdavidxu#define UMTXQ_LOCKED_ASSERT(uc) mtx_assert(&(uc)->uc_lock, MA_OWNED) 159161678Sdavidxu 160161678Sdavidxu/* 161161678Sdavidxu * Don't propagate time-sharing priority, there is a security reason, 162161678Sdavidxu * a user can simply introduce PI-mutex, let thread A lock the mutex, 163161678Sdavidxu * and let another thread B block on the mutex, because B is 164161678Sdavidxu * sleeping, its priority will be boosted, this causes A's priority to 165161678Sdavidxu * be boosted via priority propagating too and will never be lowered even 166161678Sdavidxu * if it is using 100%CPU, this is unfair to other processes. 167161678Sdavidxu */ 168161678Sdavidxu 169161678Sdavidxu#define UPRI(td) (((td)->td_ksegrp->kg_user_pri >= PRI_MIN_TIMESHARE &&\ 170161678Sdavidxu (td)->td_ksegrp->kg_user_pri <= PRI_MAX_TIMESHARE) ?\ 171161678Sdavidxu PRI_MAX_TIMESHARE : (td)->td_ksegrp->kg_user_pri) 172161678Sdavidxu 173138224Sdavidxu#define GOLDEN_RATIO_PRIME 2654404609U 174138224Sdavidxu#define UMTX_CHAINS 128 175138224Sdavidxu#define UMTX_SHIFTS (__WORD_BIT - 7) 176115765Sjeff 177161678Sdavidxu#define THREAD_SHARE 0 178161678Sdavidxu#define PROCESS_SHARE 1 179161678Sdavidxu#define AUTO_SHARE 2 180161678Sdavidxu 181161678Sdavidxu#define GET_SHARE(flags) \ 182161678Sdavidxu (((flags) & USYNC_PROCESS_SHARED) == 0 ? THREAD_SHARE : PROCESS_SHARE) 183161678Sdavidxu 184161678Sdavidxustatic uma_zone_t umtx_pi_zone; 185161678Sdavidxustatic struct umtxq_chain umtxq_chains[UMTX_CHAINS]; 186138224Sdavidxustatic MALLOC_DEFINE(M_UMTX, "umtx", "UMTX queue memory"); 187161678Sdavidxustatic int umtx_pi_allocated; 188115310Sjeff 189161678SdavidxuSYSCTL_NODE(_debug, OID_AUTO, umtx, CTLFLAG_RW, 0, "umtx debug"); 190161678SdavidxuSYSCTL_INT(_debug_umtx, OID_AUTO, umtx_pi_allocated, CTLFLAG_RD, 191161678Sdavidxu &umtx_pi_allocated, 0, "Allocated umtx_pi"); 192161678Sdavidxu 193161678Sdavidxustatic void umtxq_sysinit(void *); 194161678Sdavidxustatic void umtxq_hash(struct umtx_key *key); 195161678Sdavidxustatic struct umtxq_chain *umtxq_getchain(struct umtx_key *key); 196139013Sdavidxustatic void umtxq_lock(struct umtx_key *key); 197139013Sdavidxustatic void umtxq_unlock(struct umtx_key *key); 198139257Sdavidxustatic void umtxq_busy(struct umtx_key *key); 199139257Sdavidxustatic void umtxq_unbusy(struct umtx_key *key); 200139013Sdavidxustatic void umtxq_insert(struct umtx_q *uq); 201139013Sdavidxustatic void umtxq_remove(struct umtx_q *uq); 202161678Sdavidxustatic int umtxq_sleep(struct umtx_q *uq, const char *wmesg, int timo); 203139257Sdavidxustatic int umtxq_count(struct umtx_key *key); 204139257Sdavidxustatic int umtxq_signal(struct umtx_key *key, int nr_wakeup); 205139013Sdavidxustatic int umtx_key_match(const struct umtx_key *k1, const struct umtx_key *k2); 206161678Sdavidxustatic int umtx_key_get(void *addr, int type, int share, 207139013Sdavidxu struct umtx_key *key); 208139013Sdavidxustatic void umtx_key_release(struct umtx_key *key); 209161678Sdavidxustatic struct umtx_pi *umtx_pi_alloc(void); 210161678Sdavidxustatic void umtx_pi_free(struct umtx_pi *pi); 211161678Sdavidxustatic int do_unlock_pp(struct thread *td, struct umutex *m, uint32_t flags); 212161678Sdavidxustatic void umtx_thread_cleanup(struct thread *td); 213161678Sdavidxustatic void umtx_exec_hook(void *arg __unused, struct proc *p __unused, 214161678Sdavidxu struct image_params *imgp __unused); 215161678SdavidxuSYSINIT(umtx, SI_SUB_EVENTHANDLER+1, SI_ORDER_MIDDLE, umtxq_sysinit, NULL); 216115310Sjeff 217161678Sdavidxustatic void 218161678Sdavidxuumtxq_sysinit(void *arg __unused) 219161678Sdavidxu{ 220161678Sdavidxu int i; 221138224Sdavidxu 222161678Sdavidxu umtx_pi_zone = uma_zcreate("umtx pi", sizeof(struct umtx_pi), 223161678Sdavidxu NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 224161678Sdavidxu for (i = 0; i < UMTX_CHAINS; ++i) { 225161678Sdavidxu mtx_init(&umtxq_chains[i].uc_lock, "umtxql", NULL, 226161678Sdavidxu MTX_DEF | MTX_DUPOK); 227161678Sdavidxu TAILQ_INIT(&umtxq_chains[i].uc_queue); 228161678Sdavidxu TAILQ_INIT(&umtxq_chains[i].uc_pi_list); 229161678Sdavidxu umtxq_chains[i].uc_busy = 0; 230161678Sdavidxu umtxq_chains[i].uc_waiters = 0; 231161678Sdavidxu } 232161678Sdavidxu EVENTHANDLER_REGISTER(process_exec, umtx_exec_hook, NULL, 233161678Sdavidxu EVENTHANDLER_PRI_ANY); 234161678Sdavidxu} 235161678Sdavidxu 236143149Sdavidxustruct umtx_q * 237143149Sdavidxuumtxq_alloc(void) 238143149Sdavidxu{ 239161678Sdavidxu struct umtx_q *uq; 240161678Sdavidxu 241161678Sdavidxu uq = malloc(sizeof(struct umtx_q), M_UMTX, M_WAITOK | M_ZERO); 242161678Sdavidxu TAILQ_INIT(&uq->uq_pi_contested); 243161678Sdavidxu uq->uq_inherited_pri = PRI_MAX; 244161678Sdavidxu return (uq); 245143149Sdavidxu} 246143149Sdavidxu 247143149Sdavidxuvoid 248143149Sdavidxuumtxq_free(struct umtx_q *uq) 249143149Sdavidxu{ 250143149Sdavidxu free(uq, M_UMTX); 251143149Sdavidxu} 252143149Sdavidxu 253161678Sdavidxustatic inline void 254139013Sdavidxuumtxq_hash(struct umtx_key *key) 255138224Sdavidxu{ 256161678Sdavidxu unsigned n = (uintptr_t)key->info.both.a + key->info.both.b; 257161678Sdavidxu key->hash = ((n * GOLDEN_RATIO_PRIME) >> UMTX_SHIFTS) % UMTX_CHAINS; 258138224Sdavidxu} 259138224Sdavidxu 260139013Sdavidxustatic inline int 261139013Sdavidxuumtx_key_match(const struct umtx_key *k1, const struct umtx_key *k2) 262139013Sdavidxu{ 263139013Sdavidxu return (k1->type == k2->type && 264161678Sdavidxu k1->info.both.a == k2->info.both.a && 265161678Sdavidxu k1->info.both.b == k2->info.both.b); 266139013Sdavidxu} 267139013Sdavidxu 268161678Sdavidxustatic inline struct umtxq_chain * 269161678Sdavidxuumtxq_getchain(struct umtx_key *key) 270139013Sdavidxu{ 271161678Sdavidxu return (&umtxq_chains[key->hash]); 272139013Sdavidxu} 273139013Sdavidxu 274161678Sdavidxu/* 275161678Sdavidxu * Set chain to busy state when following operation 276161678Sdavidxu * may be blocked (kernel mutex can not be used). 277161678Sdavidxu */ 278138224Sdavidxustatic inline void 279139257Sdavidxuumtxq_busy(struct umtx_key *key) 280139257Sdavidxu{ 281161678Sdavidxu struct umtxq_chain *uc; 282139257Sdavidxu 283161678Sdavidxu uc = umtxq_getchain(key); 284161678Sdavidxu mtx_assert(&uc->uc_lock, MA_OWNED); 285161678Sdavidxu while (uc->uc_busy != 0) { 286161678Sdavidxu uc->uc_waiters++; 287161678Sdavidxu msleep(uc, &uc->uc_lock, 0, "umtxqb", 0); 288161678Sdavidxu uc->uc_waiters--; 289139257Sdavidxu } 290161678Sdavidxu uc->uc_busy = 1; 291139257Sdavidxu} 292139257Sdavidxu 293161678Sdavidxu/* 294161678Sdavidxu * Unbusy a chain. 295161678Sdavidxu */ 296139257Sdavidxustatic inline void 297139257Sdavidxuumtxq_unbusy(struct umtx_key *key) 298139257Sdavidxu{ 299161678Sdavidxu struct umtxq_chain *uc; 300139257Sdavidxu 301161678Sdavidxu uc = umtxq_getchain(key); 302161678Sdavidxu mtx_assert(&uc->uc_lock, MA_OWNED); 303161678Sdavidxu KASSERT(uc->uc_busy != 0, ("not busy")); 304161678Sdavidxu uc->uc_busy = 0; 305161678Sdavidxu if (uc->uc_waiters) 306161678Sdavidxu wakeup_one(uc); 307139257Sdavidxu} 308139257Sdavidxu 309161678Sdavidxu/* 310161678Sdavidxu * Lock a chain. 311161678Sdavidxu */ 312139257Sdavidxustatic inline void 313139013Sdavidxuumtxq_lock(struct umtx_key *key) 314138224Sdavidxu{ 315161678Sdavidxu struct umtxq_chain *uc; 316161678Sdavidxu 317161678Sdavidxu uc = umtxq_getchain(key); 318161678Sdavidxu mtx_lock(&uc->uc_lock); 319138224Sdavidxu} 320138224Sdavidxu 321161678Sdavidxu/* 322161678Sdavidxu * Unlock a chain. 323161678Sdavidxu */ 324138225Sdavidxustatic inline void 325139013Sdavidxuumtxq_unlock(struct umtx_key *key) 326138224Sdavidxu{ 327161678Sdavidxu struct umtxq_chain *uc; 328161678Sdavidxu 329161678Sdavidxu uc = umtxq_getchain(key); 330161678Sdavidxu mtx_unlock(&uc->uc_lock); 331138224Sdavidxu} 332138224Sdavidxu 333139013Sdavidxu/* 334139013Sdavidxu * Insert a thread onto the umtx queue. 335139013Sdavidxu */ 336139013Sdavidxustatic inline void 337139013Sdavidxuumtxq_insert(struct umtx_q *uq) 338115765Sjeff{ 339161678Sdavidxu struct umtxq_chain *uc; 340139013Sdavidxu 341161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 342161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 343161678Sdavidxu TAILQ_INSERT_TAIL(&uc->uc_queue, uq, uq_link); 344158718Sdavidxu uq->uq_flags |= UQF_UMTXQ; 345139013Sdavidxu} 346139013Sdavidxu 347139013Sdavidxu/* 348139013Sdavidxu * Remove thread from the umtx queue. 349139013Sdavidxu */ 350139013Sdavidxustatic inline void 351139013Sdavidxuumtxq_remove(struct umtx_q *uq) 352139013Sdavidxu{ 353161678Sdavidxu struct umtxq_chain *uc; 354161678Sdavidxu 355161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 356161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 357158718Sdavidxu if (uq->uq_flags & UQF_UMTXQ) { 358161678Sdavidxu TAILQ_REMOVE(&uc->uc_queue, uq, uq_link); 359158718Sdavidxu uq->uq_flags &= ~UQF_UMTXQ; 360139013Sdavidxu } 361139013Sdavidxu} 362139013Sdavidxu 363161678Sdavidxu/* 364161678Sdavidxu * Check if there are multiple waiters 365161678Sdavidxu */ 366139013Sdavidxustatic int 367139013Sdavidxuumtxq_count(struct umtx_key *key) 368139013Sdavidxu{ 369161678Sdavidxu struct umtxq_chain *uc; 370115765Sjeff struct umtx_q *uq; 371161678Sdavidxu int count = 0; 372115765Sjeff 373161678Sdavidxu uc = umtxq_getchain(key); 374161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 375161678Sdavidxu TAILQ_FOREACH(uq, &uc->uc_queue, uq_link) { 376139013Sdavidxu if (umtx_key_match(&uq->uq_key, key)) { 377139013Sdavidxu if (++count > 1) 378139013Sdavidxu break; 379139013Sdavidxu } 380115765Sjeff } 381139013Sdavidxu return (count); 382115765Sjeff} 383115765Sjeff 384161678Sdavidxu/* 385161678Sdavidxu * Check if there are multiple PI waiters and returns first 386161678Sdavidxu * waiter. 387161678Sdavidxu */ 388139257Sdavidxustatic int 389161678Sdavidxuumtxq_count_pi(struct umtx_key *key, struct umtx_q **first) 390161678Sdavidxu{ 391161678Sdavidxu struct umtxq_chain *uc; 392161678Sdavidxu struct umtx_q *uq; 393161678Sdavidxu int count = 0; 394161678Sdavidxu 395161678Sdavidxu *first = NULL; 396161678Sdavidxu uc = umtxq_getchain(key); 397161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 398161678Sdavidxu TAILQ_FOREACH(uq, &uc->uc_queue, uq_link) { 399161678Sdavidxu if (umtx_key_match(&uq->uq_key, key)) { 400161678Sdavidxu if (++count > 1) 401161678Sdavidxu break; 402161678Sdavidxu *first = uq; 403161678Sdavidxu } 404161678Sdavidxu } 405161678Sdavidxu return (count); 406161678Sdavidxu} 407161678Sdavidxu 408161678Sdavidxu/* 409161678Sdavidxu * Wake up threads waiting on an userland object. 410161678Sdavidxu */ 411161678Sdavidxustatic int 412139257Sdavidxuumtxq_signal(struct umtx_key *key, int n_wake) 413115765Sjeff{ 414161678Sdavidxu struct umtxq_chain *uc; 415139257Sdavidxu struct umtx_q *uq, *next; 416161678Sdavidxu int ret; 417115765Sjeff 418139257Sdavidxu ret = 0; 419161678Sdavidxu uc = umtxq_getchain(key); 420161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 421161678Sdavidxu TAILQ_FOREACH_SAFE(uq, &uc->uc_queue, uq_link, next) { 422139013Sdavidxu if (umtx_key_match(&uq->uq_key, key)) { 423139013Sdavidxu umtxq_remove(uq); 424161678Sdavidxu wakeup(uq); 425139257Sdavidxu if (++ret >= n_wake) 426139257Sdavidxu break; 427139013Sdavidxu } 428139013Sdavidxu } 429139257Sdavidxu return (ret); 430138224Sdavidxu} 431138224Sdavidxu 432161678Sdavidxu/* 433161678Sdavidxu * Wake up specified thread. 434161678Sdavidxu */ 435161678Sdavidxustatic inline void 436161678Sdavidxuumtxq_signal_thread(struct umtx_q *uq) 437161678Sdavidxu{ 438161678Sdavidxu struct umtxq_chain *uc; 439161678Sdavidxu 440161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 441161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 442161678Sdavidxu umtxq_remove(uq); 443161678Sdavidxu wakeup(uq); 444161678Sdavidxu} 445161678Sdavidxu 446161678Sdavidxu/* 447161678Sdavidxu * Put thread into sleep state, before sleeping, check if 448161678Sdavidxu * thread was removed from umtx queue. 449161678Sdavidxu */ 450138224Sdavidxustatic inline int 451161678Sdavidxuumtxq_sleep(struct umtx_q *uq, const char *wmesg, int timo) 452138224Sdavidxu{ 453161678Sdavidxu struct umtxq_chain *uc; 454161678Sdavidxu int error; 455161678Sdavidxu 456161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 457161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 458161678Sdavidxu if (!(uq->uq_flags & UQF_UMTXQ)) 459161678Sdavidxu return (0); 460161678Sdavidxu error = msleep(uq, &uc->uc_lock, PCATCH, wmesg, timo); 461139751Sdavidxu if (error == EWOULDBLOCK) 462139751Sdavidxu error = ETIMEDOUT; 463139751Sdavidxu return (error); 464138224Sdavidxu} 465138224Sdavidxu 466161678Sdavidxu/* 467161678Sdavidxu * Convert userspace address into unique logical address. 468161678Sdavidxu */ 469139013Sdavidxustatic int 470161678Sdavidxuumtx_key_get(void *addr, int type, int share, struct umtx_key *key) 471139013Sdavidxu{ 472161678Sdavidxu struct thread *td = curthread; 473139013Sdavidxu vm_map_t map; 474139013Sdavidxu vm_map_entry_t entry; 475139013Sdavidxu vm_pindex_t pindex; 476139013Sdavidxu vm_prot_t prot; 477139013Sdavidxu boolean_t wired; 478139013Sdavidxu 479161678Sdavidxu key->type = type; 480161678Sdavidxu if (share == THREAD_SHARE) { 481161678Sdavidxu key->shared = 0; 482161678Sdavidxu key->info.private.vs = td->td_proc->p_vmspace; 483161678Sdavidxu key->info.private.addr = (uintptr_t)addr; 484161678Sdavidxu } else if (share == PROCESS_SHARE || share == AUTO_SHARE) { 485161678Sdavidxu map = &td->td_proc->p_vmspace->vm_map; 486161678Sdavidxu if (vm_map_lookup(&map, (vm_offset_t)addr, VM_PROT_WRITE, 487161678Sdavidxu &entry, &key->info.shared.object, &pindex, &prot, 488161678Sdavidxu &wired) != KERN_SUCCESS) { 489161678Sdavidxu return EFAULT; 490161678Sdavidxu } 491161678Sdavidxu 492161678Sdavidxu if ((share == PROCESS_SHARE) || 493161678Sdavidxu (share == AUTO_SHARE && 494161678Sdavidxu VM_INHERIT_SHARE == entry->inheritance)) { 495161678Sdavidxu key->shared = 1; 496161678Sdavidxu key->info.shared.offset = entry->offset + entry->start - 497161678Sdavidxu (vm_offset_t)addr; 498161678Sdavidxu vm_object_reference(key->info.shared.object); 499161678Sdavidxu } else { 500161678Sdavidxu key->shared = 0; 501161678Sdavidxu key->info.private.vs = td->td_proc->p_vmspace; 502161678Sdavidxu key->info.private.addr = (uintptr_t)addr; 503161678Sdavidxu } 504161678Sdavidxu vm_map_lookup_done(map, entry); 505139013Sdavidxu } 506139013Sdavidxu 507161678Sdavidxu umtxq_hash(key); 508139013Sdavidxu return (0); 509139013Sdavidxu} 510139013Sdavidxu 511161678Sdavidxu/* 512161678Sdavidxu * Release key. 513161678Sdavidxu */ 514139013Sdavidxustatic inline void 515139013Sdavidxuumtx_key_release(struct umtx_key *key) 516139013Sdavidxu{ 517161678Sdavidxu if (key->shared) 518139013Sdavidxu vm_object_deallocate(key->info.shared.object); 519139013Sdavidxu} 520139013Sdavidxu 521161678Sdavidxu/* 522161678Sdavidxu * Lock a umtx object. 523161678Sdavidxu */ 524139013Sdavidxustatic int 525162536Sdavidxu_do_lock_umtx(struct thread *td, struct umtx *umtx, uintptr_t id, int timo) 526112904Sjeff{ 527143149Sdavidxu struct umtx_q *uq; 528112904Sjeff intptr_t owner; 529112967Sjake intptr_t old; 530138224Sdavidxu int error = 0; 531112904Sjeff 532143149Sdavidxu uq = td->td_umtxq; 533161678Sdavidxu 534112904Sjeff /* 535161678Sdavidxu * Care must be exercised when dealing with umtx structure. It 536112904Sjeff * can fault on any access. 537112904Sjeff */ 538112904Sjeff for (;;) { 539112904Sjeff /* 540112904Sjeff * Try the uncontested case. This should be done in userland. 541112904Sjeff */ 542161678Sdavidxu owner = casuptr((intptr_t *)&umtx->u_owner, UMTX_UNOWNED, id); 543112904Sjeff 544138224Sdavidxu /* The acquire succeeded. */ 545138224Sdavidxu if (owner == UMTX_UNOWNED) 546138224Sdavidxu return (0); 547138224Sdavidxu 548115765Sjeff /* The address was invalid. */ 549115765Sjeff if (owner == -1) 550115765Sjeff return (EFAULT); 551115765Sjeff 552115765Sjeff /* If no one owns it but it is contested try to acquire it. */ 553115765Sjeff if (owner == UMTX_CONTESTED) { 554115765Sjeff owner = casuptr((intptr_t *)&umtx->u_owner, 555139013Sdavidxu UMTX_CONTESTED, id | UMTX_CONTESTED); 556115765Sjeff 557138224Sdavidxu if (owner == UMTX_CONTESTED) 558138224Sdavidxu return (0); 559138224Sdavidxu 560115765Sjeff /* The address was invalid. */ 561115765Sjeff if (owner == -1) 562115765Sjeff return (EFAULT); 563115765Sjeff 564115765Sjeff /* If this failed the lock has changed, restart. */ 565115765Sjeff continue; 566112904Sjeff } 567112904Sjeff 568138224Sdavidxu /* 569138224Sdavidxu * If we caught a signal, we have retried and now 570138224Sdavidxu * exit immediately. 571138224Sdavidxu */ 572161678Sdavidxu if (error != 0) 573138224Sdavidxu return (error); 574112904Sjeff 575161678Sdavidxu if ((error = umtx_key_get(umtx, TYPE_SIMPLE_LOCK, 576161678Sdavidxu AUTO_SHARE, &uq->uq_key)) != 0) 577161678Sdavidxu return (error); 578161678Sdavidxu 579161678Sdavidxu umtxq_lock(&uq->uq_key); 580161678Sdavidxu umtxq_busy(&uq->uq_key); 581161678Sdavidxu umtxq_insert(uq); 582161678Sdavidxu umtxq_unbusy(&uq->uq_key); 583161678Sdavidxu umtxq_unlock(&uq->uq_key); 584161678Sdavidxu 585112904Sjeff /* 586112904Sjeff * Set the contested bit so that a release in user space 587112904Sjeff * knows to use the system call for unlock. If this fails 588112904Sjeff * either some one else has acquired the lock or it has been 589112904Sjeff * released. 590112904Sjeff */ 591112967Sjake old = casuptr((intptr_t *)&umtx->u_owner, owner, 592112967Sjake owner | UMTX_CONTESTED); 593112904Sjeff 594112904Sjeff /* The address was invalid. */ 595112967Sjake if (old == -1) { 596143149Sdavidxu umtxq_lock(&uq->uq_key); 597143149Sdavidxu umtxq_remove(uq); 598143149Sdavidxu umtxq_unlock(&uq->uq_key); 599143149Sdavidxu umtx_key_release(&uq->uq_key); 600115765Sjeff return (EFAULT); 601112904Sjeff } 602112904Sjeff 603112904Sjeff /* 604115765Sjeff * We set the contested bit, sleep. Otherwise the lock changed 605117685Smtm * and we need to retry or we lost a race to the thread 606117685Smtm * unlocking the umtx. 607112904Sjeff */ 608143149Sdavidxu umtxq_lock(&uq->uq_key); 609161678Sdavidxu if (old == owner) 610161678Sdavidxu error = umtxq_sleep(uq, "umtx", timo); 611143149Sdavidxu umtxq_remove(uq); 612143149Sdavidxu umtxq_unlock(&uq->uq_key); 613143149Sdavidxu umtx_key_release(&uq->uq_key); 614112904Sjeff } 615117743Smtm 616117743Smtm return (0); 617112904Sjeff} 618112904Sjeff 619161678Sdavidxu/* 620161678Sdavidxu * Lock a umtx object. 621161678Sdavidxu */ 622139013Sdavidxustatic int 623162536Sdavidxudo_lock_umtx(struct thread *td, struct umtx *umtx, uintptr_t id, 624140245Sdavidxu struct timespec *timeout) 625112904Sjeff{ 626140245Sdavidxu struct timespec ts, ts2, ts3; 627139013Sdavidxu struct timeval tv; 628140245Sdavidxu int error; 629139013Sdavidxu 630140245Sdavidxu if (timeout == NULL) { 631162536Sdavidxu error = _do_lock_umtx(td, umtx, id, 0); 632162030Sdavidxu /* Mutex locking is restarted if it is interrupted. */ 633162030Sdavidxu if (error == EINTR) 634162030Sdavidxu error = ERESTART; 635139013Sdavidxu } else { 636140245Sdavidxu getnanouptime(&ts); 637140245Sdavidxu timespecadd(&ts, timeout); 638140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 639139013Sdavidxu for (;;) { 640162536Sdavidxu error = _do_lock_umtx(td, umtx, id, tvtohz(&tv)); 641140245Sdavidxu if (error != ETIMEDOUT) 642140245Sdavidxu break; 643140245Sdavidxu getnanouptime(&ts2); 644140245Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 645139751Sdavidxu error = ETIMEDOUT; 646139013Sdavidxu break; 647139013Sdavidxu } 648140245Sdavidxu ts3 = ts; 649140245Sdavidxu timespecsub(&ts3, &ts2); 650140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 651139013Sdavidxu } 652162030Sdavidxu /* Timed-locking is not restarted. */ 653162030Sdavidxu if (error == ERESTART) 654162030Sdavidxu error = EINTR; 655139013Sdavidxu } 656139013Sdavidxu return (error); 657139013Sdavidxu} 658139013Sdavidxu 659161678Sdavidxu/* 660161678Sdavidxu * Unlock a umtx object. 661161678Sdavidxu */ 662139013Sdavidxustatic int 663162536Sdavidxudo_unlock_umtx(struct thread *td, struct umtx *umtx, uintptr_t id) 664139013Sdavidxu{ 665139013Sdavidxu struct umtx_key key; 666112904Sjeff intptr_t owner; 667112967Sjake intptr_t old; 668139257Sdavidxu int error; 669139257Sdavidxu int count; 670112904Sjeff 671112904Sjeff /* 672112904Sjeff * Make sure we own this mtx. 673112904Sjeff * 674112904Sjeff * XXX Need a {fu,su}ptr this is not correct on arch where 675112904Sjeff * sizeof(intptr_t) != sizeof(long). 676112904Sjeff */ 677161678Sdavidxu owner = fuword(&umtx->u_owner); 678161678Sdavidxu if (owner == -1) 679115765Sjeff return (EFAULT); 680115765Sjeff 681139013Sdavidxu if ((owner & ~UMTX_CONTESTED) != id) 682115765Sjeff return (EPERM); 683112904Sjeff 684161678Sdavidxu /* This should be done in userland */ 685161678Sdavidxu if ((owner & UMTX_CONTESTED) == 0) { 686161678Sdavidxu old = casuptr((intptr_t *)&umtx->u_owner, owner, 687161678Sdavidxu UMTX_UNOWNED); 688161678Sdavidxu if (old == -1) 689161678Sdavidxu return (EFAULT); 690161678Sdavidxu if (old == owner) 691161678Sdavidxu return (0); 692161855Sdavidxu owner = old; 693161678Sdavidxu } 694161678Sdavidxu 695117685Smtm /* We should only ever be in here for contested locks */ 696161678Sdavidxu if ((error = umtx_key_get(umtx, TYPE_SIMPLE_LOCK, AUTO_SHARE, 697161678Sdavidxu &key)) != 0) 698139257Sdavidxu return (error); 699139257Sdavidxu 700139257Sdavidxu umtxq_lock(&key); 701139257Sdavidxu umtxq_busy(&key); 702139257Sdavidxu count = umtxq_count(&key); 703139257Sdavidxu umtxq_unlock(&key); 704139257Sdavidxu 705117743Smtm /* 706117743Smtm * When unlocking the umtx, it must be marked as unowned if 707117743Smtm * there is zero or one thread only waiting for it. 708117743Smtm * Otherwise, it must be marked as contested. 709117743Smtm */ 710139257Sdavidxu old = casuptr((intptr_t *)&umtx->u_owner, owner, 711139257Sdavidxu count <= 1 ? UMTX_UNOWNED : UMTX_CONTESTED); 712139257Sdavidxu umtxq_lock(&key); 713161678Sdavidxu umtxq_signal(&key,1); 714139257Sdavidxu umtxq_unbusy(&key); 715139257Sdavidxu umtxq_unlock(&key); 716139257Sdavidxu umtx_key_release(&key); 717115765Sjeff if (old == -1) 718115765Sjeff return (EFAULT); 719138224Sdavidxu if (old != owner) 720138224Sdavidxu return (EINVAL); 721115765Sjeff return (0); 722112904Sjeff} 723139013Sdavidxu 724162536Sdavidxu#ifdef COMPAT_IA32 725162536Sdavidxu 726161678Sdavidxu/* 727162536Sdavidxu * Lock a umtx object. 728162536Sdavidxu */ 729162536Sdavidxustatic int 730162536Sdavidxu_do_lock_umtx32(struct thread *td, uint32_t *m, uint32_t id, int timo) 731162536Sdavidxu{ 732162536Sdavidxu struct umtx_q *uq; 733162536Sdavidxu uint32_t owner; 734162536Sdavidxu uint32_t old; 735162536Sdavidxu int error = 0; 736162536Sdavidxu 737162536Sdavidxu uq = td->td_umtxq; 738162536Sdavidxu 739162536Sdavidxu /* 740162536Sdavidxu * Care must be exercised when dealing with umtx structure. It 741162536Sdavidxu * can fault on any access. 742162536Sdavidxu */ 743162536Sdavidxu for (;;) { 744162536Sdavidxu /* 745162536Sdavidxu * Try the uncontested case. This should be done in userland. 746162536Sdavidxu */ 747162536Sdavidxu owner = casuword32(m, UMUTEX_UNOWNED, id); 748162536Sdavidxu 749162536Sdavidxu /* The acquire succeeded. */ 750162536Sdavidxu if (owner == UMUTEX_UNOWNED) 751162536Sdavidxu return (0); 752162536Sdavidxu 753162536Sdavidxu /* The address was invalid. */ 754162536Sdavidxu if (owner == -1) 755162536Sdavidxu return (EFAULT); 756162536Sdavidxu 757162536Sdavidxu /* If no one owns it but it is contested try to acquire it. */ 758162536Sdavidxu if (owner == UMUTEX_CONTESTED) { 759162536Sdavidxu owner = casuword32(m, 760162536Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 761162536Sdavidxu if (owner == UMUTEX_CONTESTED) 762162536Sdavidxu return (0); 763162536Sdavidxu 764162536Sdavidxu /* The address was invalid. */ 765162536Sdavidxu if (owner == -1) 766162536Sdavidxu return (EFAULT); 767162536Sdavidxu 768162536Sdavidxu /* If this failed the lock has changed, restart. */ 769162536Sdavidxu continue; 770162536Sdavidxu } 771162536Sdavidxu 772162536Sdavidxu /* 773162536Sdavidxu * If we caught a signal, we have retried and now 774162536Sdavidxu * exit immediately. 775162536Sdavidxu */ 776162536Sdavidxu if (error != 0) 777162536Sdavidxu return (error); 778162536Sdavidxu 779162536Sdavidxu if ((error = umtx_key_get(m, TYPE_SIMPLE_LOCK, 780162536Sdavidxu AUTO_SHARE, &uq->uq_key)) != 0) 781162536Sdavidxu return (error); 782162536Sdavidxu 783162536Sdavidxu umtxq_lock(&uq->uq_key); 784162536Sdavidxu umtxq_busy(&uq->uq_key); 785162536Sdavidxu umtxq_insert(uq); 786162536Sdavidxu umtxq_unbusy(&uq->uq_key); 787162536Sdavidxu umtxq_unlock(&uq->uq_key); 788162536Sdavidxu 789162536Sdavidxu /* 790162536Sdavidxu * Set the contested bit so that a release in user space 791162536Sdavidxu * knows to use the system call for unlock. If this fails 792162536Sdavidxu * either some one else has acquired the lock or it has been 793162536Sdavidxu * released. 794162536Sdavidxu */ 795162536Sdavidxu old = casuword32(m, owner, owner | UMUTEX_CONTESTED); 796162536Sdavidxu 797162536Sdavidxu /* The address was invalid. */ 798162536Sdavidxu if (old == -1) { 799162536Sdavidxu umtxq_lock(&uq->uq_key); 800162536Sdavidxu umtxq_remove(uq); 801162536Sdavidxu umtxq_unlock(&uq->uq_key); 802162536Sdavidxu umtx_key_release(&uq->uq_key); 803162536Sdavidxu return (EFAULT); 804162536Sdavidxu } 805162536Sdavidxu 806162536Sdavidxu /* 807162536Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 808162536Sdavidxu * and we need to retry or we lost a race to the thread 809162536Sdavidxu * unlocking the umtx. 810162536Sdavidxu */ 811162536Sdavidxu umtxq_lock(&uq->uq_key); 812162536Sdavidxu if (old == owner) 813162536Sdavidxu error = umtxq_sleep(uq, "umtx", timo); 814162536Sdavidxu umtxq_remove(uq); 815162536Sdavidxu umtxq_unlock(&uq->uq_key); 816162536Sdavidxu umtx_key_release(&uq->uq_key); 817162536Sdavidxu } 818162536Sdavidxu 819162536Sdavidxu return (0); 820162536Sdavidxu} 821162536Sdavidxu 822162536Sdavidxu/* 823162536Sdavidxu * Lock a umtx object. 824162536Sdavidxu */ 825162536Sdavidxustatic int 826162536Sdavidxudo_lock_umtx32(struct thread *td, void *m, uint32_t id, 827162536Sdavidxu struct timespec *timeout) 828162536Sdavidxu{ 829162536Sdavidxu struct timespec ts, ts2, ts3; 830162536Sdavidxu struct timeval tv; 831162536Sdavidxu int error; 832162536Sdavidxu 833162536Sdavidxu if (timeout == NULL) { 834162536Sdavidxu error = _do_lock_umtx32(td, m, id, 0); 835162536Sdavidxu /* Mutex locking is restarted if it is interrupted. */ 836162536Sdavidxu if (error == EINTR) 837162536Sdavidxu error = ERESTART; 838162536Sdavidxu } else { 839162536Sdavidxu getnanouptime(&ts); 840162536Sdavidxu timespecadd(&ts, timeout); 841162536Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 842162536Sdavidxu for (;;) { 843162536Sdavidxu error = _do_lock_umtx32(td, m, id, tvtohz(&tv)); 844162536Sdavidxu if (error != ETIMEDOUT) 845162536Sdavidxu break; 846162536Sdavidxu getnanouptime(&ts2); 847162536Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 848162536Sdavidxu error = ETIMEDOUT; 849162536Sdavidxu break; 850162536Sdavidxu } 851162536Sdavidxu ts3 = ts; 852162536Sdavidxu timespecsub(&ts3, &ts2); 853162536Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 854162536Sdavidxu } 855162536Sdavidxu /* Timed-locking is not restarted. */ 856162536Sdavidxu if (error == ERESTART) 857162536Sdavidxu error = EINTR; 858162536Sdavidxu } 859162536Sdavidxu return (error); 860162536Sdavidxu} 861162536Sdavidxu 862162536Sdavidxu/* 863162536Sdavidxu * Unlock a umtx object. 864162536Sdavidxu */ 865162536Sdavidxustatic int 866162536Sdavidxudo_unlock_umtx32(struct thread *td, uint32_t *m, uint32_t id) 867162536Sdavidxu{ 868162536Sdavidxu struct umtx_key key; 869162536Sdavidxu uint32_t owner; 870162536Sdavidxu uint32_t old; 871162536Sdavidxu int error; 872162536Sdavidxu int count; 873162536Sdavidxu 874162536Sdavidxu /* 875162536Sdavidxu * Make sure we own this mtx. 876162536Sdavidxu * 877162536Sdavidxu * XXX Need a {fu,su}ptr this is not correct on arch where 878162536Sdavidxu * sizeof(intptr_t) != sizeof(long). 879162536Sdavidxu */ 880162536Sdavidxu owner = fuword32(m); 881162536Sdavidxu if (owner == -1) 882162536Sdavidxu return (EFAULT); 883162536Sdavidxu 884162536Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 885162536Sdavidxu return (EPERM); 886162536Sdavidxu 887162536Sdavidxu /* This should be done in userland */ 888162536Sdavidxu if ((owner & UMUTEX_CONTESTED) == 0) { 889162536Sdavidxu old = casuword32(m, owner, UMUTEX_UNOWNED); 890162536Sdavidxu if (old == -1) 891162536Sdavidxu return (EFAULT); 892162536Sdavidxu if (old == owner) 893162536Sdavidxu return (0); 894162536Sdavidxu owner = old; 895162536Sdavidxu } 896162536Sdavidxu 897162536Sdavidxu /* We should only ever be in here for contested locks */ 898162536Sdavidxu if ((error = umtx_key_get(m, TYPE_SIMPLE_LOCK, AUTO_SHARE, 899162536Sdavidxu &key)) != 0) 900162536Sdavidxu return (error); 901162536Sdavidxu 902162536Sdavidxu umtxq_lock(&key); 903162536Sdavidxu umtxq_busy(&key); 904162536Sdavidxu count = umtxq_count(&key); 905162536Sdavidxu umtxq_unlock(&key); 906162536Sdavidxu 907162536Sdavidxu /* 908162536Sdavidxu * When unlocking the umtx, it must be marked as unowned if 909162536Sdavidxu * there is zero or one thread only waiting for it. 910162536Sdavidxu * Otherwise, it must be marked as contested. 911162536Sdavidxu */ 912162536Sdavidxu old = casuword32(m, owner, 913162536Sdavidxu count <= 1 ? UMUTEX_UNOWNED : UMUTEX_CONTESTED); 914162536Sdavidxu umtxq_lock(&key); 915162536Sdavidxu umtxq_signal(&key,1); 916162536Sdavidxu umtxq_unbusy(&key); 917162536Sdavidxu umtxq_unlock(&key); 918162536Sdavidxu umtx_key_release(&key); 919162536Sdavidxu if (old == -1) 920162536Sdavidxu return (EFAULT); 921162536Sdavidxu if (old != owner) 922162536Sdavidxu return (EINVAL); 923162536Sdavidxu return (0); 924162536Sdavidxu} 925162536Sdavidxu#endif 926162536Sdavidxu 927162536Sdavidxu/* 928161678Sdavidxu * Fetch and compare value, sleep on the address if value is not changed. 929161678Sdavidxu */ 930139013Sdavidxustatic int 931162536Sdavidxudo_wait(struct thread *td, void *addr, uintptr_t id, 932162536Sdavidxu struct timespec *timeout, int compat32) 933139013Sdavidxu{ 934143149Sdavidxu struct umtx_q *uq; 935140245Sdavidxu struct timespec ts, ts2, ts3; 936139013Sdavidxu struct timeval tv; 937161678Sdavidxu uintptr_t tmp; 938140245Sdavidxu int error = 0; 939139013Sdavidxu 940143149Sdavidxu uq = td->td_umtxq; 941162536Sdavidxu if ((error = umtx_key_get(addr, TYPE_SIMPLE_WAIT, AUTO_SHARE, 942161678Sdavidxu &uq->uq_key)) != 0) 943139013Sdavidxu return (error); 944161678Sdavidxu 945161678Sdavidxu umtxq_lock(&uq->uq_key); 946161678Sdavidxu umtxq_insert(uq); 947161678Sdavidxu umtxq_unlock(&uq->uq_key); 948162536Sdavidxu if (compat32 == 0) 949162536Sdavidxu tmp = fuword(addr); 950162536Sdavidxu else 951162536Sdavidxu tmp = fuword32(addr); 952139427Sdavidxu if (tmp != id) { 953143149Sdavidxu umtxq_lock(&uq->uq_key); 954143149Sdavidxu umtxq_remove(uq); 955143149Sdavidxu umtxq_unlock(&uq->uq_key); 956140245Sdavidxu } else if (timeout == NULL) { 957143149Sdavidxu umtxq_lock(&uq->uq_key); 958161678Sdavidxu error = umtxq_sleep(uq, "ucond", 0); 959161678Sdavidxu umtxq_remove(uq); 960143149Sdavidxu umtxq_unlock(&uq->uq_key); 961139013Sdavidxu } else { 962140245Sdavidxu getnanouptime(&ts); 963140245Sdavidxu timespecadd(&ts, timeout); 964140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 965161678Sdavidxu umtxq_lock(&uq->uq_key); 966139013Sdavidxu for (;;) { 967161678Sdavidxu error = umtxq_sleep(uq, "ucond", tvtohz(&tv)); 968161678Sdavidxu if (!(uq->uq_flags & UQF_UMTXQ)) 969161678Sdavidxu break; 970140245Sdavidxu if (error != ETIMEDOUT) 971140245Sdavidxu break; 972161678Sdavidxu umtxq_unlock(&uq->uq_key); 973140245Sdavidxu getnanouptime(&ts2); 974140245Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 975139751Sdavidxu error = ETIMEDOUT; 976161678Sdavidxu umtxq_lock(&uq->uq_key); 977139013Sdavidxu break; 978139013Sdavidxu } 979140245Sdavidxu ts3 = ts; 980140245Sdavidxu timespecsub(&ts3, &ts2); 981140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 982161678Sdavidxu umtxq_lock(&uq->uq_key); 983139013Sdavidxu } 984143149Sdavidxu umtxq_remove(uq); 985143149Sdavidxu umtxq_unlock(&uq->uq_key); 986139013Sdavidxu } 987143149Sdavidxu umtx_key_release(&uq->uq_key); 988139257Sdavidxu if (error == ERESTART) 989139257Sdavidxu error = EINTR; 990139013Sdavidxu return (error); 991139013Sdavidxu} 992139013Sdavidxu 993161678Sdavidxu/* 994161678Sdavidxu * Wake up threads sleeping on the specified address. 995161678Sdavidxu */ 996151692Sdavidxuint 997151692Sdavidxukern_umtx_wake(struct thread *td, void *uaddr, int n_wake) 998139013Sdavidxu{ 999139013Sdavidxu struct umtx_key key; 1000139257Sdavidxu int ret; 1001139013Sdavidxu 1002161678Sdavidxu if ((ret = umtx_key_get(uaddr, TYPE_SIMPLE_WAIT, AUTO_SHARE, 1003161678Sdavidxu &key)) != 0) 1004139257Sdavidxu return (ret); 1005139258Sdavidxu umtxq_lock(&key); 1006139257Sdavidxu ret = umtxq_signal(&key, n_wake); 1007139258Sdavidxu umtxq_unlock(&key); 1008139257Sdavidxu umtx_key_release(&key); 1009139013Sdavidxu return (0); 1010139013Sdavidxu} 1011139013Sdavidxu 1012161678Sdavidxu/* 1013161678Sdavidxu * Lock PTHREAD_PRIO_NONE protocol POSIX mutex. 1014161678Sdavidxu */ 1015161678Sdavidxustatic int 1016161678Sdavidxu_do_lock_normal(struct thread *td, struct umutex *m, uint32_t flags, int timo, 1017161678Sdavidxu int try) 1018161678Sdavidxu{ 1019161678Sdavidxu struct umtx_q *uq; 1020161678Sdavidxu uint32_t owner, old, id; 1021161678Sdavidxu int error = 0; 1022161678Sdavidxu 1023161678Sdavidxu id = td->td_tid; 1024161678Sdavidxu uq = td->td_umtxq; 1025161678Sdavidxu 1026161678Sdavidxu /* 1027161678Sdavidxu * Care must be exercised when dealing with umtx structure. It 1028161678Sdavidxu * can fault on any access. 1029161678Sdavidxu */ 1030161678Sdavidxu for (;;) { 1031161678Sdavidxu /* 1032161678Sdavidxu * Try the uncontested case. This should be done in userland. 1033161678Sdavidxu */ 1034161678Sdavidxu owner = casuword32(&m->m_owner, UMUTEX_UNOWNED, id); 1035161678Sdavidxu 1036161678Sdavidxu /* The acquire succeeded. */ 1037161678Sdavidxu if (owner == UMUTEX_UNOWNED) 1038161678Sdavidxu return (0); 1039161678Sdavidxu 1040161678Sdavidxu /* The address was invalid. */ 1041161678Sdavidxu if (owner == -1) 1042161678Sdavidxu return (EFAULT); 1043161678Sdavidxu 1044161678Sdavidxu /* If no one owns it but it is contested try to acquire it. */ 1045161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 1046161678Sdavidxu owner = casuword32(&m->m_owner, 1047161678Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 1048161678Sdavidxu 1049161678Sdavidxu if (owner == UMUTEX_CONTESTED) 1050161678Sdavidxu return (0); 1051161678Sdavidxu 1052161678Sdavidxu /* The address was invalid. */ 1053161678Sdavidxu if (owner == -1) 1054161678Sdavidxu return (EFAULT); 1055161678Sdavidxu 1056161678Sdavidxu /* If this failed the lock has changed, restart. */ 1057161678Sdavidxu continue; 1058161678Sdavidxu } 1059161678Sdavidxu 1060161678Sdavidxu if ((flags & UMUTEX_ERROR_CHECK) != 0 && 1061161678Sdavidxu (owner & ~UMUTEX_CONTESTED) == id) 1062161678Sdavidxu return (EDEADLK); 1063161678Sdavidxu 1064161678Sdavidxu if (try != 0) 1065161678Sdavidxu return (EBUSY); 1066161678Sdavidxu 1067161678Sdavidxu /* 1068161678Sdavidxu * If we caught a signal, we have retried and now 1069161678Sdavidxu * exit immediately. 1070161678Sdavidxu */ 1071161678Sdavidxu if (error != 0) 1072161678Sdavidxu return (error); 1073161678Sdavidxu 1074161678Sdavidxu if ((error = umtx_key_get(m, TYPE_NORMAL_UMUTEX, 1075161678Sdavidxu GET_SHARE(flags), &uq->uq_key)) != 0) 1076161678Sdavidxu return (error); 1077161678Sdavidxu 1078161678Sdavidxu umtxq_lock(&uq->uq_key); 1079161678Sdavidxu umtxq_busy(&uq->uq_key); 1080161678Sdavidxu umtxq_insert(uq); 1081161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1082161678Sdavidxu umtxq_unlock(&uq->uq_key); 1083161678Sdavidxu 1084161678Sdavidxu /* 1085161678Sdavidxu * Set the contested bit so that a release in user space 1086161678Sdavidxu * knows to use the system call for unlock. If this fails 1087161678Sdavidxu * either some one else has acquired the lock or it has been 1088161678Sdavidxu * released. 1089161678Sdavidxu */ 1090161678Sdavidxu old = casuword32(&m->m_owner, owner, owner | UMUTEX_CONTESTED); 1091161678Sdavidxu 1092161678Sdavidxu /* The address was invalid. */ 1093161678Sdavidxu if (old == -1) { 1094161678Sdavidxu umtxq_lock(&uq->uq_key); 1095161678Sdavidxu umtxq_remove(uq); 1096161678Sdavidxu umtxq_unlock(&uq->uq_key); 1097161678Sdavidxu umtx_key_release(&uq->uq_key); 1098161678Sdavidxu return (EFAULT); 1099161678Sdavidxu } 1100161678Sdavidxu 1101161678Sdavidxu /* 1102161678Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 1103161678Sdavidxu * and we need to retry or we lost a race to the thread 1104161678Sdavidxu * unlocking the umtx. 1105161678Sdavidxu */ 1106161678Sdavidxu umtxq_lock(&uq->uq_key); 1107161678Sdavidxu if (old == owner) 1108161678Sdavidxu error = umtxq_sleep(uq, "umtxn", timo); 1109161678Sdavidxu umtxq_remove(uq); 1110161678Sdavidxu umtxq_unlock(&uq->uq_key); 1111161678Sdavidxu umtx_key_release(&uq->uq_key); 1112161678Sdavidxu } 1113161678Sdavidxu 1114161678Sdavidxu return (0); 1115161678Sdavidxu} 1116161678Sdavidxu 1117161678Sdavidxu/* 1118161678Sdavidxu * Lock PTHREAD_PRIO_NONE protocol POSIX mutex. 1119161678Sdavidxu */ 1120161678Sdavidxu/* 1121161678Sdavidxu * Unlock PTHREAD_PRIO_NONE protocol POSIX mutex. 1122161678Sdavidxu */ 1123161678Sdavidxustatic int 1124161678Sdavidxudo_unlock_normal(struct thread *td, struct umutex *m, uint32_t flags) 1125161678Sdavidxu{ 1126161678Sdavidxu struct umtx_key key; 1127161678Sdavidxu uint32_t owner, old, id; 1128161678Sdavidxu int error; 1129161678Sdavidxu int count; 1130161678Sdavidxu 1131161678Sdavidxu id = td->td_tid; 1132161678Sdavidxu /* 1133161678Sdavidxu * Make sure we own this mtx. 1134161678Sdavidxu */ 1135161678Sdavidxu owner = fuword32(&m->m_owner); 1136161678Sdavidxu if (owner == -1) 1137161678Sdavidxu return (EFAULT); 1138161678Sdavidxu 1139161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 1140161678Sdavidxu return (EPERM); 1141161678Sdavidxu 1142161678Sdavidxu /* This should be done in userland */ 1143161678Sdavidxu if ((owner & UMUTEX_CONTESTED) == 0) { 1144161678Sdavidxu old = casuword32(&m->m_owner, owner, UMUTEX_UNOWNED); 1145161678Sdavidxu if (old == -1) 1146161678Sdavidxu return (EFAULT); 1147161678Sdavidxu if (old == owner) 1148161678Sdavidxu return (0); 1149161855Sdavidxu owner = old; 1150161678Sdavidxu } 1151161678Sdavidxu 1152161678Sdavidxu /* We should only ever be in here for contested locks */ 1153161678Sdavidxu if ((error = umtx_key_get(m, TYPE_NORMAL_UMUTEX, GET_SHARE(flags), 1154161678Sdavidxu &key)) != 0) 1155161678Sdavidxu return (error); 1156161678Sdavidxu 1157161678Sdavidxu umtxq_lock(&key); 1158161678Sdavidxu umtxq_busy(&key); 1159161678Sdavidxu count = umtxq_count(&key); 1160161678Sdavidxu umtxq_unlock(&key); 1161161678Sdavidxu 1162161678Sdavidxu /* 1163161678Sdavidxu * When unlocking the umtx, it must be marked as unowned if 1164161678Sdavidxu * there is zero or one thread only waiting for it. 1165161678Sdavidxu * Otherwise, it must be marked as contested. 1166161678Sdavidxu */ 1167161678Sdavidxu old = casuword32(&m->m_owner, owner, 1168161678Sdavidxu count <= 1 ? UMUTEX_UNOWNED : UMUTEX_CONTESTED); 1169161678Sdavidxu umtxq_lock(&key); 1170161678Sdavidxu umtxq_signal(&key,1); 1171161678Sdavidxu umtxq_unbusy(&key); 1172161678Sdavidxu umtxq_unlock(&key); 1173161678Sdavidxu umtx_key_release(&key); 1174161678Sdavidxu if (old == -1) 1175161678Sdavidxu return (EFAULT); 1176161678Sdavidxu if (old != owner) 1177161678Sdavidxu return (EINVAL); 1178161678Sdavidxu return (0); 1179161678Sdavidxu} 1180161678Sdavidxu 1181161678Sdavidxustatic inline struct umtx_pi * 1182161678Sdavidxuumtx_pi_alloc(void) 1183161678Sdavidxu{ 1184161678Sdavidxu struct umtx_pi *pi; 1185161678Sdavidxu 1186161678Sdavidxu pi = uma_zalloc(umtx_pi_zone, M_ZERO | M_WAITOK); 1187161678Sdavidxu TAILQ_INIT(&pi->pi_blocked); 1188161678Sdavidxu atomic_add_int(&umtx_pi_allocated, 1); 1189161678Sdavidxu return (pi); 1190161678Sdavidxu} 1191161678Sdavidxu 1192161678Sdavidxustatic inline void 1193161678Sdavidxuumtx_pi_free(struct umtx_pi *pi) 1194161678Sdavidxu{ 1195161678Sdavidxu uma_zfree(umtx_pi_zone, pi); 1196161678Sdavidxu atomic_add_int(&umtx_pi_allocated, -1); 1197161678Sdavidxu} 1198161678Sdavidxu 1199161678Sdavidxu/* 1200161678Sdavidxu * Adjust the thread's position on a pi_state after its priority has been 1201161678Sdavidxu * changed. 1202161678Sdavidxu */ 1203161678Sdavidxustatic int 1204161678Sdavidxuumtx_pi_adjust_thread(struct umtx_pi *pi, struct thread *td) 1205161678Sdavidxu{ 1206161678Sdavidxu struct umtx_q *uq, *uq1, *uq2; 1207161678Sdavidxu struct thread *td1; 1208161678Sdavidxu 1209161678Sdavidxu mtx_assert(&sched_lock, MA_OWNED); 1210161678Sdavidxu if (pi == NULL) 1211161678Sdavidxu return (0); 1212161678Sdavidxu 1213161678Sdavidxu uq = td->td_umtxq; 1214161678Sdavidxu 1215161678Sdavidxu /* 1216161678Sdavidxu * Check if the thread needs to be moved on the blocked chain. 1217161678Sdavidxu * It needs to be moved if either its priority is lower than 1218161678Sdavidxu * the previous thread or higher than the next thread. 1219161678Sdavidxu */ 1220161678Sdavidxu uq1 = TAILQ_PREV(uq, umtxq_head, uq_lockq); 1221161678Sdavidxu uq2 = TAILQ_NEXT(uq, uq_lockq); 1222161678Sdavidxu if ((uq1 != NULL && UPRI(td) < UPRI(uq1->uq_thread)) || 1223161678Sdavidxu (uq2 != NULL && UPRI(td) > UPRI(uq2->uq_thread))) { 1224161678Sdavidxu /* 1225161678Sdavidxu * Remove thread from blocked chain and determine where 1226161678Sdavidxu * it should be moved to. 1227161678Sdavidxu */ 1228161678Sdavidxu TAILQ_REMOVE(&pi->pi_blocked, uq, uq_lockq); 1229161678Sdavidxu TAILQ_FOREACH(uq1, &pi->pi_blocked, uq_lockq) { 1230161678Sdavidxu td1 = uq1->uq_thread; 1231161678Sdavidxu MPASS(td1->td_proc->p_magic == P_MAGIC); 1232161678Sdavidxu if (UPRI(td1) > UPRI(td)) 1233161678Sdavidxu break; 1234161678Sdavidxu } 1235161678Sdavidxu 1236161678Sdavidxu if (uq1 == NULL) 1237161678Sdavidxu TAILQ_INSERT_TAIL(&pi->pi_blocked, uq, uq_lockq); 1238161678Sdavidxu else 1239161678Sdavidxu TAILQ_INSERT_BEFORE(uq1, uq, uq_lockq); 1240161678Sdavidxu } 1241161678Sdavidxu return (1); 1242161678Sdavidxu} 1243161678Sdavidxu 1244161678Sdavidxu/* 1245161678Sdavidxu * Propagate priority when a thread is blocked on POSIX 1246161678Sdavidxu * PI mutex. 1247161678Sdavidxu */ 1248161678Sdavidxustatic void 1249161678Sdavidxuumtx_propagate_priority(struct thread *td) 1250161678Sdavidxu{ 1251161678Sdavidxu struct umtx_q *uq; 1252161678Sdavidxu struct umtx_pi *pi; 1253161678Sdavidxu int pri; 1254161678Sdavidxu 1255161678Sdavidxu mtx_assert(&sched_lock, MA_OWNED); 1256161678Sdavidxu pri = UPRI(td); 1257161678Sdavidxu uq = td->td_umtxq; 1258161678Sdavidxu pi = uq->uq_pi_blocked; 1259161678Sdavidxu if (pi == NULL) 1260161678Sdavidxu return; 1261161678Sdavidxu 1262161678Sdavidxu for (;;) { 1263161678Sdavidxu td = pi->pi_owner; 1264161678Sdavidxu if (td == NULL) 1265161678Sdavidxu return; 1266161678Sdavidxu 1267161678Sdavidxu MPASS(td->td_proc != NULL); 1268161678Sdavidxu MPASS(td->td_proc->p_magic == P_MAGIC); 1269161678Sdavidxu 1270161678Sdavidxu if (UPRI(td) <= pri) 1271161678Sdavidxu return; 1272161678Sdavidxu 1273161678Sdavidxu sched_lend_user_prio(td, pri); 1274161678Sdavidxu 1275161678Sdavidxu /* 1276161678Sdavidxu * Pick up the lock that td is blocked on. 1277161678Sdavidxu */ 1278161678Sdavidxu uq = td->td_umtxq; 1279161678Sdavidxu pi = uq->uq_pi_blocked; 1280161678Sdavidxu /* Resort td on the list if needed. */ 1281161678Sdavidxu if (!umtx_pi_adjust_thread(pi, td)) 1282161678Sdavidxu break; 1283161678Sdavidxu } 1284161678Sdavidxu} 1285161678Sdavidxu 1286161678Sdavidxu/* 1287161678Sdavidxu * Unpropagate priority for a PI mutex when a thread blocked on 1288161678Sdavidxu * it is interrupted by signal or resumed by others. 1289161678Sdavidxu */ 1290161678Sdavidxustatic void 1291161678Sdavidxuumtx_unpropagate_priority(struct umtx_pi *pi) 1292161678Sdavidxu{ 1293161678Sdavidxu struct umtx_q *uq, *uq_owner; 1294161678Sdavidxu struct umtx_pi *pi2; 1295161678Sdavidxu int pri; 1296161678Sdavidxu 1297161678Sdavidxu mtx_assert(&sched_lock, MA_OWNED); 1298161678Sdavidxu 1299161678Sdavidxu while (pi != NULL && pi->pi_owner != NULL) { 1300161678Sdavidxu pri = PRI_MAX; 1301161678Sdavidxu uq_owner = pi->pi_owner->td_umtxq; 1302161678Sdavidxu 1303161678Sdavidxu TAILQ_FOREACH(pi2, &uq_owner->uq_pi_contested, pi_link) { 1304161678Sdavidxu uq = TAILQ_FIRST(&pi2->pi_blocked); 1305161678Sdavidxu if (uq != NULL) { 1306161678Sdavidxu if (pri > UPRI(uq->uq_thread)) 1307161678Sdavidxu pri = UPRI(uq->uq_thread); 1308161678Sdavidxu } 1309161678Sdavidxu } 1310161678Sdavidxu 1311161678Sdavidxu if (pri > uq_owner->uq_inherited_pri) 1312161678Sdavidxu pri = uq_owner->uq_inherited_pri; 1313161678Sdavidxu sched_unlend_user_prio(pi->pi_owner, pri); 1314161678Sdavidxu pi = uq_owner->uq_pi_blocked; 1315161678Sdavidxu } 1316161678Sdavidxu} 1317161678Sdavidxu 1318161678Sdavidxu/* 1319161678Sdavidxu * Insert a PI mutex into owned list. 1320161678Sdavidxu */ 1321161678Sdavidxustatic void 1322161678Sdavidxuumtx_pi_setowner(struct umtx_pi *pi, struct thread *owner) 1323161678Sdavidxu{ 1324161678Sdavidxu struct umtx_q *uq_owner; 1325161678Sdavidxu 1326161678Sdavidxu uq_owner = owner->td_umtxq; 1327161678Sdavidxu mtx_assert(&sched_lock, MA_OWNED); 1328161678Sdavidxu if (pi->pi_owner != NULL) 1329161678Sdavidxu panic("pi_ower != NULL"); 1330161678Sdavidxu pi->pi_owner = owner; 1331161678Sdavidxu TAILQ_INSERT_TAIL(&uq_owner->uq_pi_contested, pi, pi_link); 1332161678Sdavidxu} 1333161678Sdavidxu 1334161678Sdavidxu/* 1335161678Sdavidxu * Claim ownership of a PI mutex. 1336161678Sdavidxu */ 1337161678Sdavidxustatic int 1338161678Sdavidxuumtx_pi_claim(struct umtx_pi *pi, struct thread *owner) 1339161678Sdavidxu{ 1340161678Sdavidxu struct umtx_q *uq, *uq_owner; 1341161678Sdavidxu 1342161678Sdavidxu uq_owner = owner->td_umtxq; 1343161678Sdavidxu mtx_lock_spin(&sched_lock); 1344161678Sdavidxu if (pi->pi_owner == owner) { 1345161678Sdavidxu mtx_unlock_spin(&sched_lock); 1346161678Sdavidxu return (0); 1347161678Sdavidxu } 1348161678Sdavidxu 1349161678Sdavidxu if (pi->pi_owner != NULL) { 1350161678Sdavidxu /* 1351161678Sdavidxu * userland may have already messed the mutex, sigh. 1352161678Sdavidxu */ 1353161678Sdavidxu mtx_unlock_spin(&sched_lock); 1354161678Sdavidxu return (EPERM); 1355161678Sdavidxu } 1356161678Sdavidxu umtx_pi_setowner(pi, owner); 1357161678Sdavidxu uq = TAILQ_FIRST(&pi->pi_blocked); 1358161678Sdavidxu if (uq != NULL) { 1359161678Sdavidxu int pri; 1360161678Sdavidxu 1361161678Sdavidxu pri = UPRI(uq->uq_thread); 1362161678Sdavidxu if (pri < UPRI(owner)) 1363161678Sdavidxu sched_lend_user_prio(owner, pri); 1364161678Sdavidxu } 1365161678Sdavidxu mtx_unlock_spin(&sched_lock); 1366161678Sdavidxu return (0); 1367161678Sdavidxu} 1368161678Sdavidxu 1369161678Sdavidxu/* 1370161678Sdavidxu * Adjust a thread's order position in its blocked PI mutex, 1371161678Sdavidxu * this may result new priority propagating process. 1372161678Sdavidxu */ 1373161599Sdavidxuvoid 1374161678Sdavidxuumtx_pi_adjust(struct thread *td, u_char oldpri) 1375161599Sdavidxu{ 1376161678Sdavidxu struct umtx_q *uq; 1377161678Sdavidxu struct umtx_pi *pi; 1378161678Sdavidxu 1379161678Sdavidxu uq = td->td_umtxq; 1380161678Sdavidxu 1381161678Sdavidxu mtx_assert(&sched_lock, MA_OWNED); 1382161678Sdavidxu MPASS(TD_ON_UPILOCK(td)); 1383161678Sdavidxu 1384161678Sdavidxu /* 1385161678Sdavidxu * Pick up the lock that td is blocked on. 1386161678Sdavidxu */ 1387161678Sdavidxu pi = uq->uq_pi_blocked; 1388161678Sdavidxu MPASS(pi != NULL); 1389161678Sdavidxu 1390161678Sdavidxu /* Resort the turnstile on the list. */ 1391161678Sdavidxu if (!umtx_pi_adjust_thread(pi, td)) 1392161678Sdavidxu return; 1393161678Sdavidxu 1394161678Sdavidxu /* 1395161678Sdavidxu * If our priority was lowered and we are at the head of the 1396161678Sdavidxu * turnstile, then propagate our new priority up the chain. 1397161678Sdavidxu */ 1398161678Sdavidxu if (uq == TAILQ_FIRST(&pi->pi_blocked) && UPRI(td) < oldpri) 1399161678Sdavidxu umtx_propagate_priority(td); 1400161599Sdavidxu} 1401161599Sdavidxu 1402161678Sdavidxu/* 1403161678Sdavidxu * Sleep on a PI mutex. 1404161678Sdavidxu */ 1405161678Sdavidxustatic int 1406161678Sdavidxuumtxq_sleep_pi(struct umtx_q *uq, struct umtx_pi *pi, 1407161678Sdavidxu uint32_t owner, const char *wmesg, int timo) 1408161678Sdavidxu{ 1409161678Sdavidxu struct umtxq_chain *uc; 1410161678Sdavidxu struct thread *td, *td1; 1411161678Sdavidxu struct umtx_q *uq1; 1412161678Sdavidxu int pri; 1413161678Sdavidxu int error = 0; 1414161678Sdavidxu 1415161678Sdavidxu td = uq->uq_thread; 1416161678Sdavidxu KASSERT(td == curthread, ("inconsistent uq_thread")); 1417161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 1418161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1419161678Sdavidxu umtxq_insert(uq); 1420161678Sdavidxu if (pi->pi_owner == NULL) { 1421161678Sdavidxu /* XXX 1422161678Sdavidxu * Current, We only support process private PI-mutex, 1423161678Sdavidxu * non-contended PI-mutexes are locked in userland. 1424161678Sdavidxu * Process shared PI-mutex should always be initialized 1425161678Sdavidxu * by kernel and be registered in kernel, locking should 1426161678Sdavidxu * always be done by kernel to avoid security problems. 1427161678Sdavidxu * For process private PI-mutex, we can find owner 1428161678Sdavidxu * thread and boost its priority safely. 1429161678Sdavidxu */ 1430161678Sdavidxu PROC_LOCK(curproc); 1431161678Sdavidxu td1 = thread_find(curproc, owner); 1432161678Sdavidxu mtx_lock_spin(&sched_lock); 1433161678Sdavidxu if (td1 != NULL && pi->pi_owner == NULL) { 1434161678Sdavidxu uq1 = td1->td_umtxq; 1435161678Sdavidxu umtx_pi_setowner(pi, td1); 1436161678Sdavidxu } 1437161678Sdavidxu PROC_UNLOCK(curproc); 1438161678Sdavidxu } else { 1439161678Sdavidxu mtx_lock_spin(&sched_lock); 1440161678Sdavidxu } 1441161678Sdavidxu 1442161678Sdavidxu TAILQ_FOREACH(uq1, &pi->pi_blocked, uq_lockq) { 1443161678Sdavidxu pri = UPRI(uq1->uq_thread); 1444161678Sdavidxu if (pri > UPRI(td)) 1445161678Sdavidxu break; 1446161678Sdavidxu } 1447161678Sdavidxu 1448161678Sdavidxu if (uq1 != NULL) 1449161678Sdavidxu TAILQ_INSERT_BEFORE(uq1, uq, uq_lockq); 1450161678Sdavidxu else 1451161678Sdavidxu TAILQ_INSERT_TAIL(&pi->pi_blocked, uq, uq_lockq); 1452161678Sdavidxu 1453161678Sdavidxu uq->uq_pi_blocked = pi; 1454161678Sdavidxu td->td_flags |= TDF_UPIBLOCKED; 1455161678Sdavidxu mtx_unlock_spin(&sched_lock); 1456161678Sdavidxu umtxq_unlock(&uq->uq_key); 1457161678Sdavidxu 1458161678Sdavidxu mtx_lock_spin(&sched_lock); 1459161678Sdavidxu umtx_propagate_priority(td); 1460161678Sdavidxu mtx_unlock_spin(&sched_lock); 1461161678Sdavidxu 1462161678Sdavidxu umtxq_lock(&uq->uq_key); 1463161678Sdavidxu if (uq->uq_flags & UQF_UMTXQ) { 1464161678Sdavidxu error = msleep(uq, &uc->uc_lock, PCATCH, wmesg, timo); 1465161678Sdavidxu if (error == EWOULDBLOCK) 1466161678Sdavidxu error = ETIMEDOUT; 1467161678Sdavidxu if (uq->uq_flags & UQF_UMTXQ) { 1468161678Sdavidxu umtxq_busy(&uq->uq_key); 1469161678Sdavidxu umtxq_remove(uq); 1470161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1471161678Sdavidxu } 1472161678Sdavidxu } 1473161678Sdavidxu umtxq_unlock(&uq->uq_key); 1474161678Sdavidxu 1475161678Sdavidxu mtx_lock_spin(&sched_lock); 1476161678Sdavidxu uq->uq_pi_blocked = NULL; 1477161678Sdavidxu td->td_flags &= ~TDF_UPIBLOCKED; 1478161678Sdavidxu TAILQ_REMOVE(&pi->pi_blocked, uq, uq_lockq); 1479161678Sdavidxu umtx_unpropagate_priority(pi); 1480161678Sdavidxu mtx_unlock_spin(&sched_lock); 1481161678Sdavidxu 1482161678Sdavidxu umtxq_lock(&uq->uq_key); 1483161678Sdavidxu 1484161678Sdavidxu return (error); 1485161678Sdavidxu} 1486161678Sdavidxu 1487161678Sdavidxu/* 1488161678Sdavidxu * Add reference count for a PI mutex. 1489161678Sdavidxu */ 1490161678Sdavidxustatic void 1491161678Sdavidxuumtx_pi_ref(struct umtx_pi *pi) 1492161678Sdavidxu{ 1493161678Sdavidxu struct umtxq_chain *uc; 1494161678Sdavidxu 1495161678Sdavidxu uc = umtxq_getchain(&pi->pi_key); 1496161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1497161678Sdavidxu pi->pi_refcount++; 1498161678Sdavidxu} 1499161678Sdavidxu 1500161678Sdavidxu/* 1501161678Sdavidxu * Decrease reference count for a PI mutex, if the counter 1502161678Sdavidxu * is decreased to zero, its memory space is freed. 1503161678Sdavidxu */ 1504161678Sdavidxustatic void 1505161678Sdavidxuumtx_pi_unref(struct umtx_pi *pi) 1506161678Sdavidxu{ 1507161678Sdavidxu struct umtxq_chain *uc; 1508161678Sdavidxu int free = 0; 1509161678Sdavidxu 1510161678Sdavidxu uc = umtxq_getchain(&pi->pi_key); 1511161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1512161678Sdavidxu KASSERT(pi->pi_refcount > 0, ("invalid reference count")); 1513161678Sdavidxu if (--pi->pi_refcount == 0) { 1514161678Sdavidxu mtx_lock_spin(&sched_lock); 1515161678Sdavidxu if (pi->pi_owner != NULL) { 1516161678Sdavidxu TAILQ_REMOVE(&pi->pi_owner->td_umtxq->uq_pi_contested, 1517161678Sdavidxu pi, pi_link); 1518161678Sdavidxu pi->pi_owner = NULL; 1519161678Sdavidxu } 1520161678Sdavidxu KASSERT(TAILQ_EMPTY(&pi->pi_blocked), 1521161678Sdavidxu ("blocked queue not empty")); 1522161678Sdavidxu mtx_unlock_spin(&sched_lock); 1523161678Sdavidxu TAILQ_REMOVE(&uc->uc_pi_list, pi, pi_hashlink); 1524161678Sdavidxu free = 1; 1525161678Sdavidxu } 1526161678Sdavidxu if (free) 1527161678Sdavidxu umtx_pi_free(pi); 1528161678Sdavidxu} 1529161678Sdavidxu 1530161678Sdavidxu/* 1531161678Sdavidxu * Find a PI mutex in hash table. 1532161678Sdavidxu */ 1533161678Sdavidxustatic struct umtx_pi * 1534161678Sdavidxuumtx_pi_lookup(struct umtx_key *key) 1535161678Sdavidxu{ 1536161678Sdavidxu struct umtxq_chain *uc; 1537161678Sdavidxu struct umtx_pi *pi; 1538161678Sdavidxu 1539161678Sdavidxu uc = umtxq_getchain(key); 1540161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1541161678Sdavidxu 1542161678Sdavidxu TAILQ_FOREACH(pi, &uc->uc_pi_list, pi_hashlink) { 1543161678Sdavidxu if (umtx_key_match(&pi->pi_key, key)) { 1544161678Sdavidxu return (pi); 1545161678Sdavidxu } 1546161678Sdavidxu } 1547161678Sdavidxu return (NULL); 1548161678Sdavidxu} 1549161678Sdavidxu 1550161678Sdavidxu/* 1551161678Sdavidxu * Insert a PI mutex into hash table. 1552161678Sdavidxu */ 1553161678Sdavidxustatic inline void 1554161678Sdavidxuumtx_pi_insert(struct umtx_pi *pi) 1555161678Sdavidxu{ 1556161678Sdavidxu struct umtxq_chain *uc; 1557161678Sdavidxu 1558161678Sdavidxu uc = umtxq_getchain(&pi->pi_key); 1559161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1560161678Sdavidxu TAILQ_INSERT_TAIL(&uc->uc_pi_list, pi, pi_hashlink); 1561161678Sdavidxu} 1562161678Sdavidxu 1563161678Sdavidxu/* 1564161678Sdavidxu * Lock a PI mutex. 1565161678Sdavidxu */ 1566161678Sdavidxustatic int 1567161678Sdavidxu_do_lock_pi(struct thread *td, struct umutex *m, uint32_t flags, int timo, 1568161678Sdavidxu int try) 1569161678Sdavidxu{ 1570161678Sdavidxu struct umtx_q *uq; 1571161678Sdavidxu struct umtx_pi *pi, *new_pi; 1572161678Sdavidxu uint32_t id, owner, old; 1573161678Sdavidxu int error; 1574161678Sdavidxu 1575161678Sdavidxu id = td->td_tid; 1576161678Sdavidxu uq = td->td_umtxq; 1577161678Sdavidxu 1578161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PI_UMUTEX, GET_SHARE(flags), 1579161678Sdavidxu &uq->uq_key)) != 0) 1580161678Sdavidxu return (error); 1581161678Sdavidxu for (;;) { 1582161678Sdavidxu pi = NULL; 1583161678Sdavidxu umtxq_lock(&uq->uq_key); 1584161678Sdavidxu pi = umtx_pi_lookup(&uq->uq_key); 1585161678Sdavidxu if (pi == NULL) { 1586161678Sdavidxu umtxq_unlock(&uq->uq_key); 1587161678Sdavidxu new_pi = umtx_pi_alloc(); 1588161678Sdavidxu new_pi->pi_key = uq->uq_key; 1589161678Sdavidxu umtxq_lock(&uq->uq_key); 1590161678Sdavidxu pi = umtx_pi_lookup(&uq->uq_key); 1591161678Sdavidxu if (pi != NULL) 1592161678Sdavidxu umtx_pi_free(new_pi); 1593161678Sdavidxu else { 1594161678Sdavidxu umtx_pi_insert(new_pi); 1595161678Sdavidxu pi = new_pi; 1596161678Sdavidxu } 1597161678Sdavidxu } 1598161678Sdavidxu 1599161678Sdavidxu umtx_pi_ref(pi); 1600161678Sdavidxu umtxq_unlock(&uq->uq_key); 1601161678Sdavidxu 1602161678Sdavidxu /* 1603161678Sdavidxu * Care must be exercised when dealing with umtx structure. It 1604161678Sdavidxu * can fault on any access. 1605161678Sdavidxu */ 1606161678Sdavidxu 1607161678Sdavidxu /* 1608161678Sdavidxu * Try the uncontested case. This should be done in userland. 1609161678Sdavidxu */ 1610161678Sdavidxu owner = casuword32(&m->m_owner, UMUTEX_UNOWNED, id); 1611161678Sdavidxu 1612161678Sdavidxu /* The acquire succeeded. */ 1613161678Sdavidxu if (owner == UMUTEX_UNOWNED) { 1614161678Sdavidxu error = 0; 1615161678Sdavidxu break; 1616161678Sdavidxu } 1617161678Sdavidxu 1618161678Sdavidxu /* The address was invalid. */ 1619161678Sdavidxu if (owner == -1) { 1620161678Sdavidxu error = EFAULT; 1621161678Sdavidxu break; 1622161678Sdavidxu } 1623161678Sdavidxu 1624161678Sdavidxu /* If no one owns it but it is contested try to acquire it. */ 1625161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 1626161678Sdavidxu owner = casuword32(&m->m_owner, 1627161678Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 1628161678Sdavidxu 1629161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 1630161678Sdavidxu umtxq_lock(&uq->uq_key); 1631161678Sdavidxu error = umtx_pi_claim(pi, td); 1632161678Sdavidxu umtxq_unlock(&uq->uq_key); 1633161678Sdavidxu break; 1634161678Sdavidxu } 1635161678Sdavidxu 1636161678Sdavidxu /* The address was invalid. */ 1637161678Sdavidxu if (owner == -1) { 1638161678Sdavidxu error = EFAULT; 1639161678Sdavidxu break; 1640161678Sdavidxu } 1641161678Sdavidxu 1642161678Sdavidxu /* If this failed the lock has changed, restart. */ 1643161678Sdavidxu umtxq_lock(&uq->uq_key); 1644161678Sdavidxu umtx_pi_unref(pi); 1645161678Sdavidxu umtxq_unlock(&uq->uq_key); 1646161678Sdavidxu pi = NULL; 1647161678Sdavidxu continue; 1648161678Sdavidxu } 1649161678Sdavidxu 1650161678Sdavidxu if ((flags & UMUTEX_ERROR_CHECK) != 0 && 1651161678Sdavidxu (owner & ~UMUTEX_CONTESTED) == id) { 1652161678Sdavidxu error = EDEADLK; 1653161678Sdavidxu break; 1654161678Sdavidxu } 1655161678Sdavidxu 1656161678Sdavidxu if (try != 0) { 1657161678Sdavidxu error = EBUSY; 1658161678Sdavidxu break; 1659161678Sdavidxu } 1660161678Sdavidxu 1661161678Sdavidxu /* 1662161678Sdavidxu * If we caught a signal, we have retried and now 1663161678Sdavidxu * exit immediately. 1664161678Sdavidxu */ 1665161678Sdavidxu if (error != 0) 1666161678Sdavidxu break; 1667161678Sdavidxu 1668161678Sdavidxu umtxq_lock(&uq->uq_key); 1669161678Sdavidxu umtxq_busy(&uq->uq_key); 1670161678Sdavidxu umtxq_unlock(&uq->uq_key); 1671161678Sdavidxu 1672161678Sdavidxu /* 1673161678Sdavidxu * Set the contested bit so that a release in user space 1674161678Sdavidxu * knows to use the system call for unlock. If this fails 1675161678Sdavidxu * either some one else has acquired the lock or it has been 1676161678Sdavidxu * released. 1677161678Sdavidxu */ 1678161678Sdavidxu old = casuword32(&m->m_owner, owner, owner | UMUTEX_CONTESTED); 1679161678Sdavidxu 1680161678Sdavidxu /* The address was invalid. */ 1681161678Sdavidxu if (old == -1) { 1682161678Sdavidxu umtxq_lock(&uq->uq_key); 1683161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1684161678Sdavidxu umtxq_unlock(&uq->uq_key); 1685161678Sdavidxu error = EFAULT; 1686161678Sdavidxu break; 1687161678Sdavidxu } 1688161678Sdavidxu 1689161678Sdavidxu umtxq_lock(&uq->uq_key); 1690161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1691161678Sdavidxu /* 1692161678Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 1693161678Sdavidxu * and we need to retry or we lost a race to the thread 1694161678Sdavidxu * unlocking the umtx. 1695161678Sdavidxu */ 1696161678Sdavidxu if (old == owner) 1697161678Sdavidxu error = umtxq_sleep_pi(uq, pi, owner & ~UMUTEX_CONTESTED, 1698161678Sdavidxu "umtxpi", timo); 1699161678Sdavidxu umtx_pi_unref(pi); 1700161678Sdavidxu umtxq_unlock(&uq->uq_key); 1701161678Sdavidxu pi = NULL; 1702161678Sdavidxu } 1703161678Sdavidxu 1704161678Sdavidxu if (pi != NULL) { 1705161678Sdavidxu umtxq_lock(&uq->uq_key); 1706161678Sdavidxu umtx_pi_unref(pi); 1707161678Sdavidxu umtxq_unlock(&uq->uq_key); 1708161678Sdavidxu } 1709161678Sdavidxu 1710161678Sdavidxu umtx_key_release(&uq->uq_key); 1711161678Sdavidxu return (error); 1712161678Sdavidxu} 1713161678Sdavidxu 1714161678Sdavidxu/* 1715161678Sdavidxu * Unlock a PI mutex. 1716161678Sdavidxu */ 1717161678Sdavidxustatic int 1718161678Sdavidxudo_unlock_pi(struct thread *td, struct umutex *m, uint32_t flags) 1719161678Sdavidxu{ 1720161678Sdavidxu struct umtx_key key; 1721161678Sdavidxu struct umtx_q *uq_first, *uq_first2, *uq_me; 1722161678Sdavidxu struct umtx_pi *pi, *pi2; 1723161678Sdavidxu uint32_t owner, old, id; 1724161678Sdavidxu int error; 1725161678Sdavidxu int count; 1726161678Sdavidxu int pri; 1727161678Sdavidxu 1728161678Sdavidxu id = td->td_tid; 1729161678Sdavidxu /* 1730161678Sdavidxu * Make sure we own this mtx. 1731161678Sdavidxu */ 1732161678Sdavidxu owner = fuword32(&m->m_owner); 1733161678Sdavidxu if (owner == -1) 1734161678Sdavidxu return (EFAULT); 1735161678Sdavidxu 1736161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 1737161678Sdavidxu return (EPERM); 1738161678Sdavidxu 1739161678Sdavidxu /* This should be done in userland */ 1740161678Sdavidxu if ((owner & UMUTEX_CONTESTED) == 0) { 1741161678Sdavidxu old = casuword32(&m->m_owner, owner, UMUTEX_UNOWNED); 1742161678Sdavidxu if (old == -1) 1743161678Sdavidxu return (EFAULT); 1744161678Sdavidxu if (old == owner) 1745161678Sdavidxu return (0); 1746161855Sdavidxu owner = old; 1747161678Sdavidxu } 1748161678Sdavidxu 1749161678Sdavidxu /* We should only ever be in here for contested locks */ 1750161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PI_UMUTEX, GET_SHARE(flags), 1751161678Sdavidxu &key)) != 0) 1752161678Sdavidxu return (error); 1753161678Sdavidxu 1754161678Sdavidxu umtxq_lock(&key); 1755161678Sdavidxu umtxq_busy(&key); 1756161678Sdavidxu count = umtxq_count_pi(&key, &uq_first); 1757161678Sdavidxu if (uq_first != NULL) { 1758161678Sdavidxu pi = uq_first->uq_pi_blocked; 1759161678Sdavidxu if (pi->pi_owner != curthread) { 1760161678Sdavidxu umtxq_unbusy(&key); 1761161678Sdavidxu umtxq_unlock(&key); 1762161678Sdavidxu /* userland messed the mutex */ 1763161678Sdavidxu return (EPERM); 1764161678Sdavidxu } 1765161678Sdavidxu uq_me = curthread->td_umtxq; 1766161678Sdavidxu mtx_lock_spin(&sched_lock); 1767161678Sdavidxu pi->pi_owner = NULL; 1768161678Sdavidxu TAILQ_REMOVE(&uq_me->uq_pi_contested, pi, pi_link); 1769161678Sdavidxu uq_first = TAILQ_FIRST(&pi->pi_blocked); 1770161678Sdavidxu pri = PRI_MAX; 1771161678Sdavidxu TAILQ_FOREACH(pi2, &uq_me->uq_pi_contested, pi_link) { 1772161678Sdavidxu uq_first2 = TAILQ_FIRST(&pi2->pi_blocked); 1773161678Sdavidxu if (uq_first2 != NULL) { 1774161678Sdavidxu if (pri > UPRI(uq_first2->uq_thread)) 1775161678Sdavidxu pri = UPRI(uq_first2->uq_thread); 1776161678Sdavidxu } 1777161678Sdavidxu } 1778161678Sdavidxu sched_unlend_user_prio(curthread, pri); 1779161678Sdavidxu mtx_unlock_spin(&sched_lock); 1780161678Sdavidxu } 1781161678Sdavidxu umtxq_unlock(&key); 1782161678Sdavidxu 1783161678Sdavidxu /* 1784161678Sdavidxu * When unlocking the umtx, it must be marked as unowned if 1785161678Sdavidxu * there is zero or one thread only waiting for it. 1786161678Sdavidxu * Otherwise, it must be marked as contested. 1787161678Sdavidxu */ 1788161678Sdavidxu old = casuword32(&m->m_owner, owner, 1789161678Sdavidxu count <= 1 ? UMUTEX_UNOWNED : UMUTEX_CONTESTED); 1790161678Sdavidxu 1791161678Sdavidxu umtxq_lock(&key); 1792161678Sdavidxu if (uq_first != NULL) 1793161678Sdavidxu umtxq_signal_thread(uq_first); 1794161678Sdavidxu umtxq_unbusy(&key); 1795161678Sdavidxu umtxq_unlock(&key); 1796161678Sdavidxu umtx_key_release(&key); 1797161678Sdavidxu if (old == -1) 1798161678Sdavidxu return (EFAULT); 1799161678Sdavidxu if (old != owner) 1800161678Sdavidxu return (EINVAL); 1801161678Sdavidxu return (0); 1802161678Sdavidxu} 1803161678Sdavidxu 1804161678Sdavidxu/* 1805161678Sdavidxu * Lock a PP mutex. 1806161678Sdavidxu */ 1807161678Sdavidxustatic int 1808161678Sdavidxu_do_lock_pp(struct thread *td, struct umutex *m, uint32_t flags, int timo, 1809161678Sdavidxu int try) 1810161678Sdavidxu{ 1811161678Sdavidxu struct umtx_q *uq, *uq2; 1812161678Sdavidxu struct umtx_pi *pi; 1813161678Sdavidxu uint32_t ceiling; 1814161678Sdavidxu uint32_t owner, id; 1815161678Sdavidxu int error, pri, old_inherited_pri, su; 1816161678Sdavidxu 1817161678Sdavidxu id = td->td_tid; 1818161678Sdavidxu uq = td->td_umtxq; 1819161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PP_UMUTEX, GET_SHARE(flags), 1820161678Sdavidxu &uq->uq_key)) != 0) 1821161678Sdavidxu return (error); 1822161678Sdavidxu su = (suser(td) == 0); 1823161678Sdavidxu for (;;) { 1824161678Sdavidxu old_inherited_pri = uq->uq_inherited_pri; 1825161678Sdavidxu umtxq_lock(&uq->uq_key); 1826161678Sdavidxu umtxq_busy(&uq->uq_key); 1827161678Sdavidxu umtxq_unlock(&uq->uq_key); 1828161678Sdavidxu 1829161678Sdavidxu ceiling = RTP_PRIO_MAX - fuword32(&m->m_ceilings[0]); 1830161678Sdavidxu if (ceiling > RTP_PRIO_MAX) { 1831161678Sdavidxu error = EINVAL; 1832161678Sdavidxu goto out; 1833161678Sdavidxu } 1834161678Sdavidxu 1835161678Sdavidxu mtx_lock_spin(&sched_lock); 1836161678Sdavidxu if (UPRI(td) < PRI_MIN_REALTIME + ceiling) { 1837161678Sdavidxu mtx_unlock_spin(&sched_lock); 1838161678Sdavidxu error = EINVAL; 1839161678Sdavidxu goto out; 1840161678Sdavidxu } 1841161678Sdavidxu if (su && PRI_MIN_REALTIME + ceiling < uq->uq_inherited_pri) { 1842161678Sdavidxu uq->uq_inherited_pri = PRI_MIN_REALTIME + ceiling; 1843161678Sdavidxu if (uq->uq_inherited_pri < UPRI(td)) 1844161678Sdavidxu sched_lend_user_prio(td, uq->uq_inherited_pri); 1845161678Sdavidxu } 1846161678Sdavidxu mtx_unlock_spin(&sched_lock); 1847161678Sdavidxu 1848161678Sdavidxu owner = casuword32(&m->m_owner, 1849161678Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 1850161678Sdavidxu 1851161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 1852161678Sdavidxu error = 0; 1853161678Sdavidxu break; 1854161678Sdavidxu } 1855161678Sdavidxu 1856161678Sdavidxu /* The address was invalid. */ 1857161678Sdavidxu if (owner == -1) { 1858161678Sdavidxu error = EFAULT; 1859161678Sdavidxu break; 1860161678Sdavidxu } 1861161678Sdavidxu 1862161678Sdavidxu if ((flags & UMUTEX_ERROR_CHECK) != 0 && 1863161678Sdavidxu (owner & ~UMUTEX_CONTESTED) == id) { 1864161678Sdavidxu error = EDEADLK; 1865161678Sdavidxu break; 1866161678Sdavidxu } 1867161678Sdavidxu 1868161678Sdavidxu if (try != 0) { 1869161678Sdavidxu error = EBUSY; 1870161678Sdavidxu break; 1871161678Sdavidxu } 1872161678Sdavidxu 1873161678Sdavidxu /* 1874161678Sdavidxu * If we caught a signal, we have retried and now 1875161678Sdavidxu * exit immediately. 1876161678Sdavidxu */ 1877161678Sdavidxu if (error != 0) 1878161678Sdavidxu break; 1879161678Sdavidxu 1880161678Sdavidxu umtxq_lock(&uq->uq_key); 1881161678Sdavidxu umtxq_insert(uq); 1882161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1883161678Sdavidxu error = umtxq_sleep(uq, "umtxpp", timo); 1884161678Sdavidxu umtxq_remove(uq); 1885161678Sdavidxu umtxq_unlock(&uq->uq_key); 1886161678Sdavidxu 1887161678Sdavidxu mtx_lock_spin(&sched_lock); 1888161678Sdavidxu uq->uq_inherited_pri = old_inherited_pri; 1889161678Sdavidxu pri = PRI_MAX; 1890161678Sdavidxu TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) { 1891161678Sdavidxu uq2 = TAILQ_FIRST(&pi->pi_blocked); 1892161678Sdavidxu if (uq2 != NULL) { 1893161678Sdavidxu if (pri > UPRI(uq2->uq_thread)) 1894161678Sdavidxu pri = UPRI(uq2->uq_thread); 1895161678Sdavidxu } 1896161678Sdavidxu } 1897161678Sdavidxu if (pri > uq->uq_inherited_pri) 1898161678Sdavidxu pri = uq->uq_inherited_pri; 1899161678Sdavidxu sched_unlend_user_prio(td, pri); 1900161678Sdavidxu mtx_unlock_spin(&sched_lock); 1901161678Sdavidxu } 1902161678Sdavidxu 1903161678Sdavidxu if (error != 0) { 1904161678Sdavidxu mtx_lock_spin(&sched_lock); 1905161678Sdavidxu uq->uq_inherited_pri = old_inherited_pri; 1906161678Sdavidxu pri = PRI_MAX; 1907161678Sdavidxu TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) { 1908161678Sdavidxu uq2 = TAILQ_FIRST(&pi->pi_blocked); 1909161678Sdavidxu if (uq2 != NULL) { 1910161678Sdavidxu if (pri > UPRI(uq2->uq_thread)) 1911161678Sdavidxu pri = UPRI(uq2->uq_thread); 1912161678Sdavidxu } 1913161678Sdavidxu } 1914161678Sdavidxu if (pri > uq->uq_inherited_pri) 1915161678Sdavidxu pri = uq->uq_inherited_pri; 1916161678Sdavidxu sched_unlend_user_prio(td, pri); 1917161678Sdavidxu mtx_unlock_spin(&sched_lock); 1918161678Sdavidxu } 1919161678Sdavidxu 1920161678Sdavidxuout: 1921161678Sdavidxu umtxq_lock(&uq->uq_key); 1922161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1923161678Sdavidxu umtxq_unlock(&uq->uq_key); 1924161678Sdavidxu umtx_key_release(&uq->uq_key); 1925161678Sdavidxu return (error); 1926161678Sdavidxu} 1927161678Sdavidxu 1928161678Sdavidxu/* 1929161678Sdavidxu * Unlock a PP mutex. 1930161678Sdavidxu */ 1931161678Sdavidxustatic int 1932161678Sdavidxudo_unlock_pp(struct thread *td, struct umutex *m, uint32_t flags) 1933161678Sdavidxu{ 1934161678Sdavidxu struct umtx_key key; 1935161678Sdavidxu struct umtx_q *uq, *uq2; 1936161678Sdavidxu struct umtx_pi *pi; 1937161678Sdavidxu uint32_t owner, id; 1938161678Sdavidxu uint32_t rceiling; 1939161926Sdavidxu int error, pri, new_inherited_pri, su; 1940161678Sdavidxu 1941161678Sdavidxu id = td->td_tid; 1942161678Sdavidxu uq = td->td_umtxq; 1943161926Sdavidxu su = (suser(td) == 0); 1944161678Sdavidxu 1945161678Sdavidxu /* 1946161678Sdavidxu * Make sure we own this mtx. 1947161678Sdavidxu */ 1948161678Sdavidxu owner = fuword32(&m->m_owner); 1949161678Sdavidxu if (owner == -1) 1950161678Sdavidxu return (EFAULT); 1951161678Sdavidxu 1952161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 1953161678Sdavidxu return (EPERM); 1954161678Sdavidxu 1955161678Sdavidxu error = copyin(&m->m_ceilings[1], &rceiling, sizeof(uint32_t)); 1956161678Sdavidxu if (error != 0) 1957161678Sdavidxu return (error); 1958161678Sdavidxu 1959161678Sdavidxu if (rceiling == -1) 1960161678Sdavidxu new_inherited_pri = PRI_MAX; 1961161678Sdavidxu else { 1962161678Sdavidxu rceiling = RTP_PRIO_MAX - rceiling; 1963161678Sdavidxu if (rceiling > RTP_PRIO_MAX) 1964161678Sdavidxu return (EINVAL); 1965161678Sdavidxu new_inherited_pri = PRI_MIN_REALTIME + rceiling; 1966161678Sdavidxu } 1967161678Sdavidxu 1968161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PP_UMUTEX, GET_SHARE(flags), 1969161678Sdavidxu &key)) != 0) 1970161678Sdavidxu return (error); 1971161678Sdavidxu umtxq_lock(&key); 1972161678Sdavidxu umtxq_busy(&key); 1973161678Sdavidxu umtxq_unlock(&key); 1974161678Sdavidxu /* 1975161678Sdavidxu * For priority protected mutex, always set unlocked state 1976161678Sdavidxu * to UMUTEX_CONTESTED, so that userland always enters kernel 1977161678Sdavidxu * to lock the mutex, it is necessary because thread priority 1978161678Sdavidxu * has to be adjusted for such mutex. 1979161678Sdavidxu */ 1980161678Sdavidxu error = suword32(&m->m_owner, UMUTEX_CONTESTED); 1981161678Sdavidxu 1982161678Sdavidxu umtxq_lock(&key); 1983161678Sdavidxu if (error == 0) 1984161678Sdavidxu umtxq_signal(&key, 1); 1985161678Sdavidxu umtxq_unbusy(&key); 1986161678Sdavidxu umtxq_unlock(&key); 1987161678Sdavidxu 1988161678Sdavidxu if (error == -1) 1989161678Sdavidxu error = EFAULT; 1990161678Sdavidxu else { 1991161678Sdavidxu mtx_lock_spin(&sched_lock); 1992161926Sdavidxu if (su != 0) 1993161926Sdavidxu uq->uq_inherited_pri = new_inherited_pri; 1994161678Sdavidxu pri = PRI_MAX; 1995161678Sdavidxu TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) { 1996161678Sdavidxu uq2 = TAILQ_FIRST(&pi->pi_blocked); 1997161678Sdavidxu if (uq2 != NULL) { 1998161678Sdavidxu if (pri > UPRI(uq2->uq_thread)) 1999161678Sdavidxu pri = UPRI(uq2->uq_thread); 2000161678Sdavidxu } 2001161678Sdavidxu } 2002161678Sdavidxu if (pri > uq->uq_inherited_pri) 2003161678Sdavidxu pri = uq->uq_inherited_pri; 2004161678Sdavidxu sched_unlend_user_prio(td, pri); 2005161678Sdavidxu mtx_unlock_spin(&sched_lock); 2006161678Sdavidxu } 2007161678Sdavidxu umtx_key_release(&key); 2008161678Sdavidxu return (error); 2009161678Sdavidxu} 2010161678Sdavidxu 2011161678Sdavidxustatic int 2012161678Sdavidxudo_set_ceiling(struct thread *td, struct umutex *m, uint32_t ceiling, 2013161678Sdavidxu uint32_t *old_ceiling) 2014161678Sdavidxu{ 2015161678Sdavidxu struct umtx_q *uq; 2016161678Sdavidxu uint32_t save_ceiling; 2017161678Sdavidxu uint32_t owner, id; 2018161678Sdavidxu uint32_t flags; 2019161678Sdavidxu int error; 2020161678Sdavidxu 2021161678Sdavidxu flags = fuword32(&m->m_flags); 2022161678Sdavidxu if ((flags & UMUTEX_PRIO_PROTECT) == 0) 2023161678Sdavidxu return (EINVAL); 2024161678Sdavidxu if (ceiling > RTP_PRIO_MAX) 2025161678Sdavidxu return (EINVAL); 2026161678Sdavidxu id = td->td_tid; 2027161678Sdavidxu uq = td->td_umtxq; 2028161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PP_UMUTEX, GET_SHARE(flags), 2029161678Sdavidxu &uq->uq_key)) != 0) 2030161678Sdavidxu return (error); 2031161678Sdavidxu for (;;) { 2032161678Sdavidxu umtxq_lock(&uq->uq_key); 2033161678Sdavidxu umtxq_busy(&uq->uq_key); 2034161678Sdavidxu umtxq_unlock(&uq->uq_key); 2035161678Sdavidxu 2036161678Sdavidxu save_ceiling = fuword32(&m->m_ceilings[0]); 2037161678Sdavidxu 2038161678Sdavidxu owner = casuword32(&m->m_owner, 2039161678Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 2040161678Sdavidxu 2041161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 2042161678Sdavidxu suword32(&m->m_ceilings[0], ceiling); 2043161678Sdavidxu suword32(&m->m_owner, UMUTEX_CONTESTED); 2044161678Sdavidxu error = 0; 2045161678Sdavidxu break; 2046161678Sdavidxu } 2047161678Sdavidxu 2048161678Sdavidxu /* The address was invalid. */ 2049161678Sdavidxu if (owner == -1) { 2050161678Sdavidxu error = EFAULT; 2051161678Sdavidxu break; 2052161678Sdavidxu } 2053161678Sdavidxu 2054161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) == id) { 2055161678Sdavidxu suword32(&m->m_ceilings[0], ceiling); 2056161678Sdavidxu error = 0; 2057161678Sdavidxu break; 2058161678Sdavidxu } 2059161678Sdavidxu 2060161678Sdavidxu /* 2061161678Sdavidxu * If we caught a signal, we have retried and now 2062161678Sdavidxu * exit immediately. 2063161678Sdavidxu */ 2064161678Sdavidxu if (error != 0) 2065161678Sdavidxu break; 2066161678Sdavidxu 2067161678Sdavidxu /* 2068161678Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 2069161678Sdavidxu * and we need to retry or we lost a race to the thread 2070161678Sdavidxu * unlocking the umtx. 2071161678Sdavidxu */ 2072161678Sdavidxu umtxq_lock(&uq->uq_key); 2073161678Sdavidxu umtxq_insert(uq); 2074161678Sdavidxu umtxq_unbusy(&uq->uq_key); 2075161678Sdavidxu error = umtxq_sleep(uq, "umtxpp", 0); 2076161678Sdavidxu umtxq_remove(uq); 2077161678Sdavidxu umtxq_unlock(&uq->uq_key); 2078161678Sdavidxu } 2079161678Sdavidxu umtxq_lock(&uq->uq_key); 2080161678Sdavidxu if (error == 0) 2081161678Sdavidxu umtxq_signal(&uq->uq_key, INT_MAX); 2082161678Sdavidxu umtxq_unbusy(&uq->uq_key); 2083161678Sdavidxu umtxq_unlock(&uq->uq_key); 2084161678Sdavidxu umtx_key_release(&uq->uq_key); 2085161678Sdavidxu if (error == 0 && old_ceiling != NULL) 2086161678Sdavidxu suword32(old_ceiling, save_ceiling); 2087161678Sdavidxu return (error); 2088161678Sdavidxu} 2089161678Sdavidxu 2090162030Sdavidxustatic int 2091162030Sdavidxu_do_lock_umutex(struct thread *td, struct umutex *m, int flags, int timo, 2092162030Sdavidxu int try) 2093162030Sdavidxu{ 2094162030Sdavidxu switch(flags & (UMUTEX_PRIO_INHERIT | UMUTEX_PRIO_PROTECT)) { 2095162030Sdavidxu case 0: 2096162030Sdavidxu return (_do_lock_normal(td, m, flags, timo, try)); 2097162030Sdavidxu case UMUTEX_PRIO_INHERIT: 2098162030Sdavidxu return (_do_lock_pi(td, m, flags, timo, try)); 2099162030Sdavidxu case UMUTEX_PRIO_PROTECT: 2100162030Sdavidxu return (_do_lock_pp(td, m, flags, timo, try)); 2101162030Sdavidxu } 2102162030Sdavidxu return (EINVAL); 2103162030Sdavidxu} 2104162030Sdavidxu 2105161678Sdavidxu/* 2106161678Sdavidxu * Lock a userland POSIX mutex. 2107161678Sdavidxu */ 2108161678Sdavidxustatic int 2109162030Sdavidxudo_lock_umutex(struct thread *td, struct umutex *m, 2110162030Sdavidxu struct timespec *timeout, int try) 2111161678Sdavidxu{ 2112162030Sdavidxu struct timespec ts, ts2, ts3; 2113162030Sdavidxu struct timeval tv; 2114161678Sdavidxu uint32_t flags; 2115162030Sdavidxu int error; 2116161678Sdavidxu 2117161678Sdavidxu flags = fuword32(&m->m_flags); 2118161678Sdavidxu if (flags == -1) 2119161678Sdavidxu return (EFAULT); 2120161678Sdavidxu 2121162030Sdavidxu if (timeout == NULL) { 2122162030Sdavidxu error = _do_lock_umutex(td, m, flags, 0, try); 2123162030Sdavidxu /* Mutex locking is restarted if it is interrupted. */ 2124162030Sdavidxu if (error == EINTR) 2125162030Sdavidxu error = ERESTART; 2126162030Sdavidxu } else { 2127162030Sdavidxu getnanouptime(&ts); 2128162030Sdavidxu timespecadd(&ts, timeout); 2129162030Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 2130162030Sdavidxu for (;;) { 2131162030Sdavidxu error = _do_lock_umutex(td, m, flags, tvtohz(&tv), try); 2132162030Sdavidxu if (error != ETIMEDOUT) 2133162030Sdavidxu break; 2134162030Sdavidxu getnanouptime(&ts2); 2135162030Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 2136162030Sdavidxu error = ETIMEDOUT; 2137162030Sdavidxu break; 2138162030Sdavidxu } 2139162030Sdavidxu ts3 = ts; 2140162030Sdavidxu timespecsub(&ts3, &ts2); 2141162030Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 2142162030Sdavidxu } 2143162030Sdavidxu /* Timed-locking is not restarted. */ 2144162030Sdavidxu if (error == ERESTART) 2145162030Sdavidxu error = EINTR; 2146161742Sdavidxu } 2147162030Sdavidxu return (error); 2148161678Sdavidxu} 2149161678Sdavidxu 2150161678Sdavidxu/* 2151161678Sdavidxu * Unlock a userland POSIX mutex. 2152161678Sdavidxu */ 2153161678Sdavidxustatic int 2154161678Sdavidxudo_unlock_umutex(struct thread *td, struct umutex *m) 2155161678Sdavidxu{ 2156161678Sdavidxu uint32_t flags; 2157161678Sdavidxu 2158161678Sdavidxu flags = fuword32(&m->m_flags); 2159161678Sdavidxu if (flags == -1) 2160161678Sdavidxu return (EFAULT); 2161161678Sdavidxu 2162161855Sdavidxu switch(flags & (UMUTEX_PRIO_INHERIT | UMUTEX_PRIO_PROTECT)) { 2163161855Sdavidxu case 0: 2164161855Sdavidxu return (do_unlock_normal(td, m, flags)); 2165161855Sdavidxu case UMUTEX_PRIO_INHERIT: 2166161855Sdavidxu return (do_unlock_pi(td, m, flags)); 2167161855Sdavidxu case UMUTEX_PRIO_PROTECT: 2168161855Sdavidxu return (do_unlock_pp(td, m, flags)); 2169161855Sdavidxu } 2170161678Sdavidxu 2171161855Sdavidxu return (EINVAL); 2172161678Sdavidxu} 2173161678Sdavidxu 2174139013Sdavidxuint 2175139013Sdavidxu_umtx_lock(struct thread *td, struct _umtx_lock_args *uap) 2176139013Sdavidxu /* struct umtx *umtx */ 2177139013Sdavidxu{ 2178162536Sdavidxu return _do_lock_umtx(td, uap->umtx, td->td_tid, 0); 2179139013Sdavidxu} 2180139013Sdavidxu 2181139013Sdavidxuint 2182139013Sdavidxu_umtx_unlock(struct thread *td, struct _umtx_unlock_args *uap) 2183139013Sdavidxu /* struct umtx *umtx */ 2184139013Sdavidxu{ 2185162536Sdavidxu return do_unlock_umtx(td, uap->umtx, td->td_tid); 2186139013Sdavidxu} 2187139013Sdavidxu 2188162536Sdavidxustatic int 2189162536Sdavidxu__umtx_op_lock_umtx(struct thread *td, struct _umtx_op_args *uap) 2190139013Sdavidxu{ 2191162536Sdavidxu struct timespec *ts, timeout; 2192139013Sdavidxu int error; 2193139013Sdavidxu 2194162536Sdavidxu /* Allow a null timespec (wait forever). */ 2195162536Sdavidxu if (uap->uaddr2 == NULL) 2196162536Sdavidxu ts = NULL; 2197162536Sdavidxu else { 2198162536Sdavidxu error = copyin(uap->uaddr2, &timeout, sizeof(timeout)); 2199162536Sdavidxu if (error != 0) 2200162536Sdavidxu return (error); 2201162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2202162536Sdavidxu timeout.tv_nsec < 0) { 2203162536Sdavidxu return (EINVAL); 2204161678Sdavidxu } 2205162536Sdavidxu ts = &timeout; 2206162536Sdavidxu } 2207162536Sdavidxu return (do_lock_umtx(td, uap->obj, uap->val, ts)); 2208162536Sdavidxu} 2209162536Sdavidxu 2210162536Sdavidxustatic int 2211162536Sdavidxu__umtx_op_unlock_umtx(struct thread *td, struct _umtx_op_args *uap) 2212162536Sdavidxu{ 2213162536Sdavidxu return (do_unlock_umtx(td, uap->obj, uap->val)); 2214162536Sdavidxu} 2215162536Sdavidxu 2216162536Sdavidxustatic int 2217162536Sdavidxu__umtx_op_wait(struct thread *td, struct _umtx_op_args *uap) 2218162536Sdavidxu{ 2219162536Sdavidxu struct timespec *ts, timeout; 2220162536Sdavidxu int error; 2221162536Sdavidxu 2222162536Sdavidxu if (uap->uaddr2 == NULL) 2223162536Sdavidxu ts = NULL; 2224162536Sdavidxu else { 2225162536Sdavidxu error = copyin(uap->uaddr2, &timeout, sizeof(timeout)); 2226162536Sdavidxu if (error != 0) 2227162536Sdavidxu return (error); 2228162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2229162536Sdavidxu timeout.tv_nsec < 0) 2230162536Sdavidxu return (EINVAL); 2231162536Sdavidxu ts = &timeout; 2232162536Sdavidxu } 2233162536Sdavidxu return do_wait(td, uap->obj, uap->val, ts, 0); 2234162536Sdavidxu} 2235162536Sdavidxu 2236162536Sdavidxustatic int 2237162536Sdavidxu__umtx_op_wake(struct thread *td, struct _umtx_op_args *uap) 2238162536Sdavidxu{ 2239162536Sdavidxu return (kern_umtx_wake(td, uap->obj, uap->val)); 2240162536Sdavidxu} 2241162536Sdavidxu 2242162536Sdavidxustatic int 2243162536Sdavidxu__umtx_op_lock_umutex(struct thread *td, struct _umtx_op_args *uap) 2244162536Sdavidxu{ 2245162536Sdavidxu struct timespec *ts, timeout; 2246162536Sdavidxu int error; 2247162536Sdavidxu 2248162536Sdavidxu /* Allow a null timespec (wait forever). */ 2249162536Sdavidxu if (uap->uaddr2 == NULL) 2250162536Sdavidxu ts = NULL; 2251162536Sdavidxu else { 2252162536Sdavidxu error = copyin(uap->uaddr2, &timeout, 2253162536Sdavidxu sizeof(timeout)); 2254162536Sdavidxu if (error != 0) 2255162536Sdavidxu return (error); 2256162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2257162536Sdavidxu timeout.tv_nsec < 0) { 2258162536Sdavidxu return (EINVAL); 2259139013Sdavidxu } 2260162536Sdavidxu ts = &timeout; 2261139013Sdavidxu } 2262162536Sdavidxu return do_lock_umutex(td, uap->obj, ts, 0); 2263162536Sdavidxu} 2264162536Sdavidxu 2265162536Sdavidxustatic int 2266162536Sdavidxu__umtx_op_trylock_umutex(struct thread *td, struct _umtx_op_args *uap) 2267162536Sdavidxu{ 2268162536Sdavidxu return do_lock_umutex(td, uap->obj, NULL, 1); 2269162536Sdavidxu} 2270162536Sdavidxu 2271162536Sdavidxustatic int 2272162536Sdavidxu__umtx_op_unlock_umutex(struct thread *td, struct _umtx_op_args *uap) 2273162536Sdavidxu{ 2274162536Sdavidxu return do_unlock_umutex(td, uap->obj); 2275162536Sdavidxu} 2276162536Sdavidxu 2277162536Sdavidxustatic int 2278162536Sdavidxu__umtx_op_set_ceiling(struct thread *td, struct _umtx_op_args *uap) 2279162536Sdavidxu{ 2280162536Sdavidxu return do_set_ceiling(td, uap->obj, uap->val, uap->uaddr1); 2281162536Sdavidxu} 2282162536Sdavidxu 2283162536Sdavidxutypedef int (*_umtx_op_func)(struct thread *td, struct _umtx_op_args *uap); 2284162536Sdavidxu 2285162536Sdavidxustatic _umtx_op_func op_table[] = { 2286162536Sdavidxu __umtx_op_lock_umtx, /* UMTX_OP_LOCK */ 2287162536Sdavidxu __umtx_op_unlock_umtx, /* UMTX_OP_UNLOCK */ 2288162536Sdavidxu __umtx_op_wait, /* UMTX_OP_WAIT */ 2289162536Sdavidxu __umtx_op_wake, /* UMTX_OP_WAKE */ 2290162536Sdavidxu __umtx_op_trylock_umutex, /* UMTX_OP_MUTEX_TRYLOCK */ 2291162536Sdavidxu __umtx_op_lock_umutex, /* UMTX_OP_MUTEX_LOCK */ 2292162536Sdavidxu __umtx_op_unlock_umutex, /* UMTX_OP_MUTEX_UNLOCK */ 2293162536Sdavidxu __umtx_op_set_ceiling /* UMTX_OP_SET_CEILING */ 2294162536Sdavidxu}; 2295162536Sdavidxu 2296162536Sdavidxuint 2297162536Sdavidxu_umtx_op(struct thread *td, struct _umtx_op_args *uap) 2298162536Sdavidxu{ 2299162536Sdavidxu if (uap->op >= 0 && uap->op < UMTX_OP_MAX) 2300162536Sdavidxu return (*op_table[uap->op])(td, uap); 2301162536Sdavidxu return (EINVAL); 2302162536Sdavidxu} 2303162536Sdavidxu 2304162536Sdavidxu#ifdef COMPAT_IA32 2305162536Sdavidxu 2306162536Sdavidxustruct timespec32 { 2307162536Sdavidxu u_int32_t tv_sec; 2308162536Sdavidxu u_int32_t tv_nsec; 2309162536Sdavidxu}; 2310162536Sdavidxu 2311162536Sdavidxustatic inline int 2312162536Sdavidxucopyin_timeout32(void *addr, struct timespec *tsp) 2313162536Sdavidxu{ 2314162536Sdavidxu struct timespec32 ts32; 2315162536Sdavidxu int error; 2316162536Sdavidxu 2317162536Sdavidxu error = copyin(addr, &ts32, sizeof(struct timespec32)); 2318162536Sdavidxu if (error == 0) { 2319162536Sdavidxu tsp->tv_sec = ts32.tv_sec; 2320162536Sdavidxu tsp->tv_nsec = ts32.tv_nsec; 2321162536Sdavidxu } 2322140421Sdavidxu return (error); 2323139013Sdavidxu} 2324161678Sdavidxu 2325162536Sdavidxustatic int 2326162536Sdavidxu__umtx_op_lock_umtx_compat32(struct thread *td, struct _umtx_op_args *uap) 2327162536Sdavidxu{ 2328162536Sdavidxu struct timespec *ts, timeout; 2329162536Sdavidxu int error; 2330162536Sdavidxu 2331162536Sdavidxu /* Allow a null timespec (wait forever). */ 2332162536Sdavidxu if (uap->uaddr2 == NULL) 2333162536Sdavidxu ts = NULL; 2334162536Sdavidxu else { 2335162536Sdavidxu error = copyin_timeout32(uap->uaddr2, &timeout); 2336162536Sdavidxu if (error != 0) 2337162536Sdavidxu return (error); 2338162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2339162536Sdavidxu timeout.tv_nsec < 0) { 2340162536Sdavidxu return (EINVAL); 2341162536Sdavidxu } 2342162536Sdavidxu ts = &timeout; 2343162536Sdavidxu } 2344162536Sdavidxu return (do_lock_umtx32(td, uap->obj, uap->val, ts)); 2345162536Sdavidxu} 2346162536Sdavidxu 2347162536Sdavidxustatic int 2348162536Sdavidxu__umtx_op_unlock_umtx_compat32(struct thread *td, struct _umtx_op_args *uap) 2349162536Sdavidxu{ 2350162536Sdavidxu return (do_unlock_umtx32(td, uap->obj, (uint32_t)uap->val)); 2351162536Sdavidxu} 2352162536Sdavidxu 2353162536Sdavidxustatic int 2354162536Sdavidxu__umtx_op_wait_compat32(struct thread *td, struct _umtx_op_args *uap) 2355162536Sdavidxu{ 2356162536Sdavidxu struct timespec *ts, timeout; 2357162536Sdavidxu int error; 2358162536Sdavidxu 2359162536Sdavidxu if (uap->uaddr2 == NULL) 2360162536Sdavidxu ts = NULL; 2361162536Sdavidxu else { 2362162536Sdavidxu error = copyin_timeout32(uap->uaddr2, &timeout); 2363162536Sdavidxu if (error != 0) 2364162536Sdavidxu return (error); 2365162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2366162536Sdavidxu timeout.tv_nsec < 0) 2367162536Sdavidxu return (EINVAL); 2368162536Sdavidxu ts = &timeout; 2369162536Sdavidxu } 2370162536Sdavidxu return do_wait(td, uap->obj, uap->val, ts, 1); 2371162536Sdavidxu} 2372162536Sdavidxu 2373162536Sdavidxustatic int 2374162536Sdavidxu__umtx_op_lock_umutex_compat32(struct thread *td, struct _umtx_op_args *uap) 2375162536Sdavidxu{ 2376162536Sdavidxu struct timespec *ts, timeout; 2377162536Sdavidxu int error; 2378162536Sdavidxu 2379162536Sdavidxu /* Allow a null timespec (wait forever). */ 2380162536Sdavidxu if (uap->uaddr2 == NULL) 2381162536Sdavidxu ts = NULL; 2382162536Sdavidxu else { 2383162536Sdavidxu error = copyin_timeout32(uap->uaddr2, &timeout); 2384162536Sdavidxu if (error != 0) 2385162536Sdavidxu return (error); 2386162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2387162536Sdavidxu timeout.tv_nsec < 0) 2388162536Sdavidxu return (EINVAL); 2389162536Sdavidxu ts = &timeout; 2390162536Sdavidxu } 2391162536Sdavidxu return do_lock_umutex(td, uap->obj, ts, 0); 2392162536Sdavidxu} 2393162536Sdavidxu 2394162536Sdavidxustatic _umtx_op_func op_table_compat32[] = { 2395162536Sdavidxu __umtx_op_lock_umtx_compat32, /* UMTX_OP_LOCK */ 2396162536Sdavidxu __umtx_op_unlock_umtx_compat32, /* UMTX_OP_UNLOCK */ 2397162536Sdavidxu __umtx_op_wait_compat32, /* UMTX_OP_WAIT */ 2398162536Sdavidxu __umtx_op_wake, /* UMTX_OP_WAKE */ 2399162536Sdavidxu __umtx_op_lock_umutex_compat32, /* UMTX_OP_MUTEX_TRYLOCK */ 2400162536Sdavidxu __umtx_op_trylock_umutex, /* UMTX_OP_MUTEX_LOCK */ 2401162536Sdavidxu __umtx_op_unlock_umutex, /* UMTX_OP_MUTEX_UNLOCK */ 2402162536Sdavidxu __umtx_op_set_ceiling /* UMTX_OP_SET_CEILING */ 2403162536Sdavidxu}; 2404162536Sdavidxu 2405162536Sdavidxuint 2406162536Sdavidxufreebsd32_umtx_op(struct thread *td, struct freebsd32_umtx_op_args *uap) 2407162536Sdavidxu{ 2408162536Sdavidxu if (uap->op >= 0 && uap->op < UMTX_OP_MAX) 2409162536Sdavidxu return (*op_table_compat32[uap->op])(td, 2410162536Sdavidxu (struct _umtx_op_args *)uap); 2411162536Sdavidxu return (EINVAL); 2412162536Sdavidxu} 2413162536Sdavidxu#endif 2414162536Sdavidxu 2415161678Sdavidxuvoid 2416161678Sdavidxuumtx_thread_init(struct thread *td) 2417161678Sdavidxu{ 2418161678Sdavidxu td->td_umtxq = umtxq_alloc(); 2419161678Sdavidxu td->td_umtxq->uq_thread = td; 2420161678Sdavidxu} 2421161678Sdavidxu 2422161678Sdavidxuvoid 2423161678Sdavidxuumtx_thread_fini(struct thread *td) 2424161678Sdavidxu{ 2425161678Sdavidxu umtxq_free(td->td_umtxq); 2426161678Sdavidxu} 2427161678Sdavidxu 2428161678Sdavidxu/* 2429161678Sdavidxu * It will be called when new thread is created, e.g fork(). 2430161678Sdavidxu */ 2431161678Sdavidxuvoid 2432161678Sdavidxuumtx_thread_alloc(struct thread *td) 2433161678Sdavidxu{ 2434161678Sdavidxu struct umtx_q *uq; 2435161678Sdavidxu 2436161678Sdavidxu uq = td->td_umtxq; 2437161678Sdavidxu uq->uq_inherited_pri = PRI_MAX; 2438161678Sdavidxu 2439161678Sdavidxu KASSERT(uq->uq_flags == 0, ("uq_flags != 0")); 2440161678Sdavidxu KASSERT(uq->uq_thread == td, ("uq_thread != td")); 2441161678Sdavidxu KASSERT(uq->uq_pi_blocked == NULL, ("uq_pi_blocked != NULL")); 2442161678Sdavidxu KASSERT(TAILQ_EMPTY(&uq->uq_pi_contested), ("uq_pi_contested is not empty")); 2443161678Sdavidxu} 2444161678Sdavidxu 2445161678Sdavidxu/* 2446161678Sdavidxu * exec() hook. 2447161678Sdavidxu */ 2448161678Sdavidxustatic void 2449161678Sdavidxuumtx_exec_hook(void *arg __unused, struct proc *p __unused, 2450161678Sdavidxu struct image_params *imgp __unused) 2451161678Sdavidxu{ 2452161678Sdavidxu umtx_thread_cleanup(curthread); 2453161678Sdavidxu} 2454161678Sdavidxu 2455161678Sdavidxu/* 2456161678Sdavidxu * thread_exit() hook. 2457161678Sdavidxu */ 2458161678Sdavidxuvoid 2459161678Sdavidxuumtx_thread_exit(struct thread *td) 2460161678Sdavidxu{ 2461161678Sdavidxu umtx_thread_cleanup(td); 2462161678Sdavidxu} 2463161678Sdavidxu 2464161678Sdavidxu/* 2465161678Sdavidxu * clean up umtx data. 2466161678Sdavidxu */ 2467161678Sdavidxustatic void 2468161678Sdavidxuumtx_thread_cleanup(struct thread *td) 2469161678Sdavidxu{ 2470161678Sdavidxu struct umtx_q *uq; 2471161678Sdavidxu struct umtx_pi *pi; 2472161678Sdavidxu 2473161678Sdavidxu if ((uq = td->td_umtxq) == NULL) 2474161678Sdavidxu return; 2475161678Sdavidxu 2476161678Sdavidxu mtx_lock_spin(&sched_lock); 2477161678Sdavidxu uq->uq_inherited_pri = PRI_MAX; 2478161678Sdavidxu while ((pi = TAILQ_FIRST(&uq->uq_pi_contested)) != NULL) { 2479161678Sdavidxu pi->pi_owner = NULL; 2480161678Sdavidxu TAILQ_REMOVE(&uq->uq_pi_contested, pi, pi_link); 2481161678Sdavidxu } 2482161678Sdavidxu td->td_flags &= ~TDF_UBORROWING; 2483161678Sdavidxu mtx_unlock_spin(&sched_lock); 2484161678Sdavidxu} 2485