kern_umtx.c revision 228218
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 228218 2011-12-03 12:28:33Z pho $"); 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> 38164033Srwatson#include <sys/priv.h> 39112904Sjeff#include <sys/proc.h> 40161678Sdavidxu#include <sys/sched.h> 41165369Sdavidxu#include <sys/smp.h> 42161678Sdavidxu#include <sys/sysctl.h> 43112904Sjeff#include <sys/sysent.h> 44112904Sjeff#include <sys/systm.h> 45112904Sjeff#include <sys/sysproto.h> 46216641Sdavidxu#include <sys/syscallsubr.h> 47139013Sdavidxu#include <sys/eventhandler.h> 48112904Sjeff#include <sys/umtx.h> 49112904Sjeff 50139013Sdavidxu#include <vm/vm.h> 51139013Sdavidxu#include <vm/vm_param.h> 52139013Sdavidxu#include <vm/pmap.h> 53139013Sdavidxu#include <vm/vm_map.h> 54139013Sdavidxu#include <vm/vm_object.h> 55139013Sdavidxu 56165369Sdavidxu#include <machine/cpu.h> 57165369Sdavidxu 58205014Snwhitehorn#ifdef COMPAT_FREEBSD32 59162536Sdavidxu#include <compat/freebsd32/freebsd32_proto.h> 60162536Sdavidxu#endif 61162536Sdavidxu 62179970Sdavidxu#define _UMUTEX_TRY 1 63179970Sdavidxu#define _UMUTEX_WAIT 2 64179970Sdavidxu 65161678Sdavidxu/* Priority inheritance mutex info. */ 66161678Sdavidxustruct umtx_pi { 67161678Sdavidxu /* Owner thread */ 68161678Sdavidxu struct thread *pi_owner; 69161678Sdavidxu 70161678Sdavidxu /* Reference count */ 71161678Sdavidxu int pi_refcount; 72161678Sdavidxu 73161678Sdavidxu /* List entry to link umtx holding by thread */ 74161678Sdavidxu TAILQ_ENTRY(umtx_pi) pi_link; 75161678Sdavidxu 76161678Sdavidxu /* List entry in hash */ 77161678Sdavidxu TAILQ_ENTRY(umtx_pi) pi_hashlink; 78161678Sdavidxu 79161678Sdavidxu /* List for waiters */ 80161678Sdavidxu TAILQ_HEAD(,umtx_q) pi_blocked; 81161678Sdavidxu 82161678Sdavidxu /* Identify a userland lock object */ 83161678Sdavidxu struct umtx_key pi_key; 84161678Sdavidxu}; 85161678Sdavidxu 86161678Sdavidxu/* A userland synchronous object user. */ 87115765Sjeffstruct umtx_q { 88161678Sdavidxu /* Linked list for the hash. */ 89161678Sdavidxu TAILQ_ENTRY(umtx_q) uq_link; 90161678Sdavidxu 91161678Sdavidxu /* Umtx key. */ 92161678Sdavidxu struct umtx_key uq_key; 93161678Sdavidxu 94161678Sdavidxu /* Umtx flags. */ 95161678Sdavidxu int uq_flags; 96161678Sdavidxu#define UQF_UMTXQ 0x0001 97161678Sdavidxu 98161678Sdavidxu /* The thread waits on. */ 99161678Sdavidxu struct thread *uq_thread; 100161678Sdavidxu 101161678Sdavidxu /* 102161678Sdavidxu * Blocked on PI mutex. read can use chain lock 103170300Sjeff * or umtx_lock, write must have both chain lock and 104170300Sjeff * umtx_lock being hold. 105161678Sdavidxu */ 106161678Sdavidxu struct umtx_pi *uq_pi_blocked; 107161678Sdavidxu 108161678Sdavidxu /* On blocked list */ 109161678Sdavidxu TAILQ_ENTRY(umtx_q) uq_lockq; 110161678Sdavidxu 111161678Sdavidxu /* Thread contending with us */ 112161678Sdavidxu TAILQ_HEAD(,umtx_pi) uq_pi_contested; 113161678Sdavidxu 114161742Sdavidxu /* Inherited priority from PP mutex */ 115161678Sdavidxu u_char uq_inherited_pri; 116201991Sdavidxu 117201991Sdavidxu /* Spare queue ready to be reused */ 118201991Sdavidxu struct umtxq_queue *uq_spare_queue; 119201991Sdavidxu 120201991Sdavidxu /* The queue we on */ 121201991Sdavidxu struct umtxq_queue *uq_cur_queue; 122115765Sjeff}; 123115765Sjeff 124161678SdavidxuTAILQ_HEAD(umtxq_head, umtx_q); 125161678Sdavidxu 126201991Sdavidxu/* Per-key wait-queue */ 127201991Sdavidxustruct umtxq_queue { 128201991Sdavidxu struct umtxq_head head; 129201991Sdavidxu struct umtx_key key; 130201991Sdavidxu LIST_ENTRY(umtxq_queue) link; 131201991Sdavidxu int length; 132201991Sdavidxu}; 133201991Sdavidxu 134201991SdavidxuLIST_HEAD(umtxq_list, umtxq_queue); 135201991Sdavidxu 136161678Sdavidxu/* Userland lock object's wait-queue chain */ 137138224Sdavidxustruct umtxq_chain { 138161678Sdavidxu /* Lock for this chain. */ 139161678Sdavidxu struct mtx uc_lock; 140161678Sdavidxu 141161678Sdavidxu /* List of sleep queues. */ 142201991Sdavidxu struct umtxq_list uc_queue[2]; 143177848Sdavidxu#define UMTX_SHARED_QUEUE 0 144177848Sdavidxu#define UMTX_EXCLUSIVE_QUEUE 1 145161678Sdavidxu 146201991Sdavidxu LIST_HEAD(, umtxq_queue) uc_spare_queue; 147201991Sdavidxu 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; 156201991Sdavidxu 157138224Sdavidxu}; 158115765Sjeff 159161678Sdavidxu#define UMTXQ_LOCKED_ASSERT(uc) mtx_assert(&(uc)->uc_lock, MA_OWNED) 160189756Sdavidxu#define UMTXQ_BUSY_ASSERT(uc) KASSERT(&(uc)->uc_busy, ("umtx chain is not busy")) 161161678Sdavidxu 162161678Sdavidxu/* 163161678Sdavidxu * Don't propagate time-sharing priority, there is a security reason, 164161678Sdavidxu * a user can simply introduce PI-mutex, let thread A lock the mutex, 165161678Sdavidxu * and let another thread B block on the mutex, because B is 166161678Sdavidxu * sleeping, its priority will be boosted, this causes A's priority to 167161678Sdavidxu * be boosted via priority propagating too and will never be lowered even 168161678Sdavidxu * if it is using 100%CPU, this is unfair to other processes. 169161678Sdavidxu */ 170161678Sdavidxu 171163709Sjb#define UPRI(td) (((td)->td_user_pri >= PRI_MIN_TIMESHARE &&\ 172163709Sjb (td)->td_user_pri <= PRI_MAX_TIMESHARE) ?\ 173163709Sjb PRI_MAX_TIMESHARE : (td)->td_user_pri) 174161678Sdavidxu 175138224Sdavidxu#define GOLDEN_RATIO_PRIME 2654404609U 176216678Sdavidxu#define UMTX_CHAINS 512 177216678Sdavidxu#define UMTX_SHIFTS (__WORD_BIT - 9) 178115765Sjeff 179161678Sdavidxu#define GET_SHARE(flags) \ 180161678Sdavidxu (((flags) & USYNC_PROCESS_SHARED) == 0 ? THREAD_SHARE : PROCESS_SHARE) 181161678Sdavidxu 182177848Sdavidxu#define BUSY_SPINS 200 183177848Sdavidxu 184161678Sdavidxustatic uma_zone_t umtx_pi_zone; 185179421Sdavidxustatic struct umtxq_chain umtxq_chains[2][UMTX_CHAINS]; 186138224Sdavidxustatic MALLOC_DEFINE(M_UMTX, "umtx", "UMTX queue memory"); 187161678Sdavidxustatic int umtx_pi_allocated; 188115310Sjeff 189227309Sedstatic SYSCTL_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); 200177848Sdavidxustatic void umtxq_insert_queue(struct umtx_q *uq, int q); 201177848Sdavidxustatic void umtxq_remove_queue(struct umtx_q *uq, int q); 202161678Sdavidxustatic int umtxq_sleep(struct umtx_q *uq, const char *wmesg, int timo); 203139257Sdavidxustatic int umtxq_count(struct umtx_key *key); 204163697Sdavidxustatic struct umtx_pi *umtx_pi_alloc(int); 205161678Sdavidxustatic void umtx_pi_free(struct umtx_pi *pi); 206161678Sdavidxustatic int do_unlock_pp(struct thread *td, struct umutex *m, uint32_t flags); 207161678Sdavidxustatic void umtx_thread_cleanup(struct thread *td); 208161678Sdavidxustatic void umtx_exec_hook(void *arg __unused, struct proc *p __unused, 209161678Sdavidxu struct image_params *imgp __unused); 210161678SdavidxuSYSINIT(umtx, SI_SUB_EVENTHANDLER+1, SI_ORDER_MIDDLE, umtxq_sysinit, NULL); 211115310Sjeff 212177848Sdavidxu#define umtxq_signal(key, nwake) umtxq_signal_queue((key), (nwake), UMTX_SHARED_QUEUE) 213177848Sdavidxu#define umtxq_insert(uq) umtxq_insert_queue((uq), UMTX_SHARED_QUEUE) 214177848Sdavidxu#define umtxq_remove(uq) umtxq_remove_queue((uq), UMTX_SHARED_QUEUE) 215177848Sdavidxu 216170300Sjeffstatic struct mtx umtx_lock; 217170300Sjeff 218161678Sdavidxustatic void 219161678Sdavidxuumtxq_sysinit(void *arg __unused) 220161678Sdavidxu{ 221179421Sdavidxu int i, j; 222138224Sdavidxu 223161678Sdavidxu umtx_pi_zone = uma_zcreate("umtx pi", sizeof(struct umtx_pi), 224161678Sdavidxu NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 225179421Sdavidxu for (i = 0; i < 2; ++i) { 226179421Sdavidxu for (j = 0; j < UMTX_CHAINS; ++j) { 227179421Sdavidxu mtx_init(&umtxq_chains[i][j].uc_lock, "umtxql", NULL, 228179421Sdavidxu MTX_DEF | MTX_DUPOK); 229201991Sdavidxu LIST_INIT(&umtxq_chains[i][j].uc_queue[0]); 230201991Sdavidxu LIST_INIT(&umtxq_chains[i][j].uc_queue[1]); 231201991Sdavidxu LIST_INIT(&umtxq_chains[i][j].uc_spare_queue); 232179421Sdavidxu TAILQ_INIT(&umtxq_chains[i][j].uc_pi_list); 233179421Sdavidxu umtxq_chains[i][j].uc_busy = 0; 234179421Sdavidxu umtxq_chains[i][j].uc_waiters = 0; 235179421Sdavidxu } 236161678Sdavidxu } 237170300Sjeff mtx_init(&umtx_lock, "umtx lock", NULL, MTX_SPIN); 238161678Sdavidxu EVENTHANDLER_REGISTER(process_exec, umtx_exec_hook, NULL, 239161678Sdavidxu EVENTHANDLER_PRI_ANY); 240161678Sdavidxu} 241161678Sdavidxu 242143149Sdavidxustruct umtx_q * 243143149Sdavidxuumtxq_alloc(void) 244143149Sdavidxu{ 245161678Sdavidxu struct umtx_q *uq; 246161678Sdavidxu 247161678Sdavidxu uq = malloc(sizeof(struct umtx_q), M_UMTX, M_WAITOK | M_ZERO); 248201991Sdavidxu uq->uq_spare_queue = malloc(sizeof(struct umtxq_queue), M_UMTX, M_WAITOK | M_ZERO); 249201991Sdavidxu TAILQ_INIT(&uq->uq_spare_queue->head); 250161678Sdavidxu TAILQ_INIT(&uq->uq_pi_contested); 251161678Sdavidxu uq->uq_inherited_pri = PRI_MAX; 252161678Sdavidxu return (uq); 253143149Sdavidxu} 254143149Sdavidxu 255143149Sdavidxuvoid 256143149Sdavidxuumtxq_free(struct umtx_q *uq) 257143149Sdavidxu{ 258201991Sdavidxu MPASS(uq->uq_spare_queue != NULL); 259201991Sdavidxu free(uq->uq_spare_queue, M_UMTX); 260143149Sdavidxu free(uq, M_UMTX); 261143149Sdavidxu} 262143149Sdavidxu 263161678Sdavidxustatic inline void 264139013Sdavidxuumtxq_hash(struct umtx_key *key) 265138224Sdavidxu{ 266161678Sdavidxu unsigned n = (uintptr_t)key->info.both.a + key->info.both.b; 267161678Sdavidxu key->hash = ((n * GOLDEN_RATIO_PRIME) >> UMTX_SHIFTS) % UMTX_CHAINS; 268138224Sdavidxu} 269138224Sdavidxu 270161678Sdavidxustatic inline struct umtxq_chain * 271161678Sdavidxuumtxq_getchain(struct umtx_key *key) 272139013Sdavidxu{ 273201886Sdavidxu if (key->type <= TYPE_SEM) 274179421Sdavidxu return (&umtxq_chains[1][key->hash]); 275179421Sdavidxu return (&umtxq_chains[0][key->hash]); 276139013Sdavidxu} 277139013Sdavidxu 278161678Sdavidxu/* 279177848Sdavidxu * Lock a chain. 280161678Sdavidxu */ 281138224Sdavidxustatic inline void 282177848Sdavidxuumtxq_lock(struct umtx_key *key) 283139257Sdavidxu{ 284161678Sdavidxu struct umtxq_chain *uc; 285139257Sdavidxu 286161678Sdavidxu uc = umtxq_getchain(key); 287177848Sdavidxu mtx_lock(&uc->uc_lock); 288139257Sdavidxu} 289139257Sdavidxu 290161678Sdavidxu/* 291177848Sdavidxu * Unlock a chain. 292161678Sdavidxu */ 293139257Sdavidxustatic inline void 294177848Sdavidxuumtxq_unlock(struct umtx_key *key) 295139257Sdavidxu{ 296161678Sdavidxu struct umtxq_chain *uc; 297139257Sdavidxu 298161678Sdavidxu uc = umtxq_getchain(key); 299177848Sdavidxu mtx_unlock(&uc->uc_lock); 300139257Sdavidxu} 301139257Sdavidxu 302161678Sdavidxu/* 303177848Sdavidxu * Set chain to busy state when following operation 304177848Sdavidxu * may be blocked (kernel mutex can not be used). 305161678Sdavidxu */ 306139257Sdavidxustatic inline void 307177848Sdavidxuumtxq_busy(struct umtx_key *key) 308138224Sdavidxu{ 309161678Sdavidxu struct umtxq_chain *uc; 310161678Sdavidxu 311161678Sdavidxu uc = umtxq_getchain(key); 312177848Sdavidxu mtx_assert(&uc->uc_lock, MA_OWNED); 313177848Sdavidxu if (uc->uc_busy) { 314177880Sdavidxu#ifdef SMP 315177880Sdavidxu if (smp_cpus > 1) { 316177880Sdavidxu int count = BUSY_SPINS; 317177880Sdavidxu if (count > 0) { 318177880Sdavidxu umtxq_unlock(key); 319177880Sdavidxu while (uc->uc_busy && --count > 0) 320177880Sdavidxu cpu_spinwait(); 321177880Sdavidxu umtxq_lock(key); 322177880Sdavidxu } 323177848Sdavidxu } 324177880Sdavidxu#endif 325177880Sdavidxu while (uc->uc_busy) { 326177848Sdavidxu uc->uc_waiters++; 327177848Sdavidxu msleep(uc, &uc->uc_lock, 0, "umtxqb", 0); 328177848Sdavidxu uc->uc_waiters--; 329177848Sdavidxu } 330177848Sdavidxu } 331177848Sdavidxu uc->uc_busy = 1; 332138224Sdavidxu} 333138224Sdavidxu 334161678Sdavidxu/* 335177848Sdavidxu * Unbusy a chain. 336161678Sdavidxu */ 337138225Sdavidxustatic inline void 338177848Sdavidxuumtxq_unbusy(struct umtx_key *key) 339138224Sdavidxu{ 340161678Sdavidxu struct umtxq_chain *uc; 341161678Sdavidxu 342161678Sdavidxu uc = umtxq_getchain(key); 343177848Sdavidxu mtx_assert(&uc->uc_lock, MA_OWNED); 344177848Sdavidxu KASSERT(uc->uc_busy != 0, ("not busy")); 345177848Sdavidxu uc->uc_busy = 0; 346177848Sdavidxu if (uc->uc_waiters) 347177848Sdavidxu wakeup_one(uc); 348138224Sdavidxu} 349138224Sdavidxu 350201991Sdavidxustatic struct umtxq_queue * 351201991Sdavidxuumtxq_queue_lookup(struct umtx_key *key, int q) 352201991Sdavidxu{ 353201991Sdavidxu struct umtxq_queue *uh; 354201991Sdavidxu struct umtxq_chain *uc; 355201991Sdavidxu 356201991Sdavidxu uc = umtxq_getchain(key); 357201991Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 358201991Sdavidxu LIST_FOREACH(uh, &uc->uc_queue[q], link) { 359201991Sdavidxu if (umtx_key_match(&uh->key, key)) 360201991Sdavidxu return (uh); 361201991Sdavidxu } 362201991Sdavidxu 363201991Sdavidxu return (NULL); 364201991Sdavidxu} 365201991Sdavidxu 366139013Sdavidxustatic inline void 367177848Sdavidxuumtxq_insert_queue(struct umtx_q *uq, int q) 368115765Sjeff{ 369201991Sdavidxu struct umtxq_queue *uh; 370161678Sdavidxu struct umtxq_chain *uc; 371139013Sdavidxu 372161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 373161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 374201991Sdavidxu KASSERT((uq->uq_flags & UQF_UMTXQ) == 0, ("umtx_q is already on queue")); 375203744Sdavidxu uh = umtxq_queue_lookup(&uq->uq_key, q); 376201991Sdavidxu if (uh != NULL) { 377201991Sdavidxu LIST_INSERT_HEAD(&uc->uc_spare_queue, uq->uq_spare_queue, link); 378201991Sdavidxu } else { 379201991Sdavidxu uh = uq->uq_spare_queue; 380201991Sdavidxu uh->key = uq->uq_key; 381201991Sdavidxu LIST_INSERT_HEAD(&uc->uc_queue[q], uh, link); 382201991Sdavidxu } 383201991Sdavidxu uq->uq_spare_queue = NULL; 384201991Sdavidxu 385201991Sdavidxu TAILQ_INSERT_TAIL(&uh->head, uq, uq_link); 386201991Sdavidxu uh->length++; 387158718Sdavidxu uq->uq_flags |= UQF_UMTXQ; 388201991Sdavidxu uq->uq_cur_queue = uh; 389201991Sdavidxu return; 390139013Sdavidxu} 391139013Sdavidxu 392139013Sdavidxustatic inline void 393177848Sdavidxuumtxq_remove_queue(struct umtx_q *uq, int q) 394139013Sdavidxu{ 395161678Sdavidxu struct umtxq_chain *uc; 396201991Sdavidxu struct umtxq_queue *uh; 397161678Sdavidxu 398161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 399161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 400158718Sdavidxu if (uq->uq_flags & UQF_UMTXQ) { 401201991Sdavidxu uh = uq->uq_cur_queue; 402201991Sdavidxu TAILQ_REMOVE(&uh->head, uq, uq_link); 403201991Sdavidxu uh->length--; 404158718Sdavidxu uq->uq_flags &= ~UQF_UMTXQ; 405201991Sdavidxu if (TAILQ_EMPTY(&uh->head)) { 406201991Sdavidxu KASSERT(uh->length == 0, 407201991Sdavidxu ("inconsistent umtxq_queue length")); 408201991Sdavidxu LIST_REMOVE(uh, link); 409201991Sdavidxu } else { 410201991Sdavidxu uh = LIST_FIRST(&uc->uc_spare_queue); 411201991Sdavidxu KASSERT(uh != NULL, ("uc_spare_queue is empty")); 412201991Sdavidxu LIST_REMOVE(uh, link); 413201991Sdavidxu } 414201991Sdavidxu uq->uq_spare_queue = uh; 415201991Sdavidxu uq->uq_cur_queue = NULL; 416139013Sdavidxu } 417139013Sdavidxu} 418139013Sdavidxu 419161678Sdavidxu/* 420161678Sdavidxu * Check if there are multiple waiters 421161678Sdavidxu */ 422139013Sdavidxustatic int 423139013Sdavidxuumtxq_count(struct umtx_key *key) 424139013Sdavidxu{ 425161678Sdavidxu struct umtxq_chain *uc; 426201991Sdavidxu struct umtxq_queue *uh; 427115765Sjeff 428161678Sdavidxu uc = umtxq_getchain(key); 429161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 430201991Sdavidxu uh = umtxq_queue_lookup(key, UMTX_SHARED_QUEUE); 431201991Sdavidxu if (uh != NULL) 432201991Sdavidxu return (uh->length); 433201991Sdavidxu return (0); 434115765Sjeff} 435115765Sjeff 436161678Sdavidxu/* 437161678Sdavidxu * Check if there are multiple PI waiters and returns first 438161678Sdavidxu * waiter. 439161678Sdavidxu */ 440139257Sdavidxustatic int 441161678Sdavidxuumtxq_count_pi(struct umtx_key *key, struct umtx_q **first) 442161678Sdavidxu{ 443161678Sdavidxu struct umtxq_chain *uc; 444201991Sdavidxu struct umtxq_queue *uh; 445161678Sdavidxu 446161678Sdavidxu *first = NULL; 447161678Sdavidxu uc = umtxq_getchain(key); 448161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 449201991Sdavidxu uh = umtxq_queue_lookup(key, UMTX_SHARED_QUEUE); 450201991Sdavidxu if (uh != NULL) { 451201991Sdavidxu *first = TAILQ_FIRST(&uh->head); 452201991Sdavidxu return (uh->length); 453161678Sdavidxu } 454201991Sdavidxu return (0); 455161678Sdavidxu} 456161678Sdavidxu 457161678Sdavidxu/* 458161678Sdavidxu * Wake up threads waiting on an userland object. 459161678Sdavidxu */ 460177848Sdavidxu 461161678Sdavidxustatic int 462177848Sdavidxuumtxq_signal_queue(struct umtx_key *key, int n_wake, int q) 463115765Sjeff{ 464161678Sdavidxu struct umtxq_chain *uc; 465201991Sdavidxu struct umtxq_queue *uh; 466201991Sdavidxu struct umtx_q *uq; 467161678Sdavidxu int ret; 468115765Sjeff 469139257Sdavidxu ret = 0; 470161678Sdavidxu uc = umtxq_getchain(key); 471161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 472201991Sdavidxu uh = umtxq_queue_lookup(key, q); 473201991Sdavidxu if (uh != NULL) { 474201991Sdavidxu while ((uq = TAILQ_FIRST(&uh->head)) != NULL) { 475177848Sdavidxu umtxq_remove_queue(uq, q); 476161678Sdavidxu wakeup(uq); 477139257Sdavidxu if (++ret >= n_wake) 478201991Sdavidxu return (ret); 479139013Sdavidxu } 480139013Sdavidxu } 481139257Sdavidxu return (ret); 482138224Sdavidxu} 483138224Sdavidxu 484177848Sdavidxu 485161678Sdavidxu/* 486161678Sdavidxu * Wake up specified thread. 487161678Sdavidxu */ 488161678Sdavidxustatic inline void 489161678Sdavidxuumtxq_signal_thread(struct umtx_q *uq) 490161678Sdavidxu{ 491161678Sdavidxu struct umtxq_chain *uc; 492161678Sdavidxu 493161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 494161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 495161678Sdavidxu umtxq_remove(uq); 496161678Sdavidxu wakeup(uq); 497161678Sdavidxu} 498161678Sdavidxu 499161678Sdavidxu/* 500161678Sdavidxu * Put thread into sleep state, before sleeping, check if 501161678Sdavidxu * thread was removed from umtx queue. 502161678Sdavidxu */ 503138224Sdavidxustatic inline int 504161678Sdavidxuumtxq_sleep(struct umtx_q *uq, const char *wmesg, int timo) 505138224Sdavidxu{ 506161678Sdavidxu struct umtxq_chain *uc; 507161678Sdavidxu int error; 508161678Sdavidxu 509161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 510161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 511161678Sdavidxu if (!(uq->uq_flags & UQF_UMTXQ)) 512161678Sdavidxu return (0); 513161678Sdavidxu error = msleep(uq, &uc->uc_lock, PCATCH, wmesg, timo); 514139751Sdavidxu if (error == EWOULDBLOCK) 515139751Sdavidxu error = ETIMEDOUT; 516139751Sdavidxu return (error); 517138224Sdavidxu} 518138224Sdavidxu 519161678Sdavidxu/* 520161678Sdavidxu * Convert userspace address into unique logical address. 521161678Sdavidxu */ 522218969Sjhbint 523161678Sdavidxuumtx_key_get(void *addr, int type, int share, struct umtx_key *key) 524139013Sdavidxu{ 525161678Sdavidxu struct thread *td = curthread; 526139013Sdavidxu vm_map_t map; 527139013Sdavidxu vm_map_entry_t entry; 528139013Sdavidxu vm_pindex_t pindex; 529139013Sdavidxu vm_prot_t prot; 530139013Sdavidxu boolean_t wired; 531139013Sdavidxu 532161678Sdavidxu key->type = type; 533161678Sdavidxu if (share == THREAD_SHARE) { 534161678Sdavidxu key->shared = 0; 535161678Sdavidxu key->info.private.vs = td->td_proc->p_vmspace; 536161678Sdavidxu key->info.private.addr = (uintptr_t)addr; 537163677Sdavidxu } else { 538163677Sdavidxu MPASS(share == PROCESS_SHARE || share == AUTO_SHARE); 539161678Sdavidxu map = &td->td_proc->p_vmspace->vm_map; 540161678Sdavidxu if (vm_map_lookup(&map, (vm_offset_t)addr, VM_PROT_WRITE, 541161678Sdavidxu &entry, &key->info.shared.object, &pindex, &prot, 542161678Sdavidxu &wired) != KERN_SUCCESS) { 543161678Sdavidxu return EFAULT; 544161678Sdavidxu } 545161678Sdavidxu 546161678Sdavidxu if ((share == PROCESS_SHARE) || 547161678Sdavidxu (share == AUTO_SHARE && 548161678Sdavidxu VM_INHERIT_SHARE == entry->inheritance)) { 549161678Sdavidxu key->shared = 1; 550161678Sdavidxu key->info.shared.offset = entry->offset + entry->start - 551161678Sdavidxu (vm_offset_t)addr; 552161678Sdavidxu vm_object_reference(key->info.shared.object); 553161678Sdavidxu } else { 554161678Sdavidxu key->shared = 0; 555161678Sdavidxu key->info.private.vs = td->td_proc->p_vmspace; 556161678Sdavidxu key->info.private.addr = (uintptr_t)addr; 557161678Sdavidxu } 558161678Sdavidxu vm_map_lookup_done(map, entry); 559139013Sdavidxu } 560139013Sdavidxu 561161678Sdavidxu umtxq_hash(key); 562139013Sdavidxu return (0); 563139013Sdavidxu} 564139013Sdavidxu 565161678Sdavidxu/* 566161678Sdavidxu * Release key. 567161678Sdavidxu */ 568218969Sjhbvoid 569139013Sdavidxuumtx_key_release(struct umtx_key *key) 570139013Sdavidxu{ 571161678Sdavidxu if (key->shared) 572139013Sdavidxu vm_object_deallocate(key->info.shared.object); 573139013Sdavidxu} 574139013Sdavidxu 575161678Sdavidxu/* 576161678Sdavidxu * Lock a umtx object. 577161678Sdavidxu */ 578139013Sdavidxustatic int 579163449Sdavidxu_do_lock_umtx(struct thread *td, struct umtx *umtx, u_long id, int timo) 580112904Sjeff{ 581143149Sdavidxu struct umtx_q *uq; 582163449Sdavidxu u_long owner; 583163449Sdavidxu u_long old; 584138224Sdavidxu int error = 0; 585112904Sjeff 586143149Sdavidxu uq = td->td_umtxq; 587161678Sdavidxu 588112904Sjeff /* 589161678Sdavidxu * Care must be exercised when dealing with umtx structure. It 590112904Sjeff * can fault on any access. 591112904Sjeff */ 592112904Sjeff for (;;) { 593112904Sjeff /* 594112904Sjeff * Try the uncontested case. This should be done in userland. 595112904Sjeff */ 596163449Sdavidxu owner = casuword(&umtx->u_owner, UMTX_UNOWNED, id); 597112904Sjeff 598138224Sdavidxu /* The acquire succeeded. */ 599138224Sdavidxu if (owner == UMTX_UNOWNED) 600138224Sdavidxu return (0); 601138224Sdavidxu 602115765Sjeff /* The address was invalid. */ 603115765Sjeff if (owner == -1) 604115765Sjeff return (EFAULT); 605115765Sjeff 606115765Sjeff /* If no one owns it but it is contested try to acquire it. */ 607115765Sjeff if (owner == UMTX_CONTESTED) { 608163449Sdavidxu owner = casuword(&umtx->u_owner, 609139013Sdavidxu UMTX_CONTESTED, id | UMTX_CONTESTED); 610115765Sjeff 611138224Sdavidxu if (owner == UMTX_CONTESTED) 612138224Sdavidxu return (0); 613138224Sdavidxu 614115765Sjeff /* The address was invalid. */ 615115765Sjeff if (owner == -1) 616115765Sjeff return (EFAULT); 617115765Sjeff 618115765Sjeff /* If this failed the lock has changed, restart. */ 619115765Sjeff continue; 620112904Sjeff } 621112904Sjeff 622138224Sdavidxu /* 623138224Sdavidxu * If we caught a signal, we have retried and now 624138224Sdavidxu * exit immediately. 625138224Sdavidxu */ 626161678Sdavidxu if (error != 0) 627138224Sdavidxu return (error); 628112904Sjeff 629161678Sdavidxu if ((error = umtx_key_get(umtx, TYPE_SIMPLE_LOCK, 630161678Sdavidxu AUTO_SHARE, &uq->uq_key)) != 0) 631161678Sdavidxu return (error); 632161678Sdavidxu 633161678Sdavidxu umtxq_lock(&uq->uq_key); 634161678Sdavidxu umtxq_busy(&uq->uq_key); 635161678Sdavidxu umtxq_insert(uq); 636161678Sdavidxu umtxq_unbusy(&uq->uq_key); 637161678Sdavidxu umtxq_unlock(&uq->uq_key); 638161678Sdavidxu 639112904Sjeff /* 640112904Sjeff * Set the contested bit so that a release in user space 641112904Sjeff * knows to use the system call for unlock. If this fails 642112904Sjeff * either some one else has acquired the lock or it has been 643112904Sjeff * released. 644112904Sjeff */ 645163449Sdavidxu old = casuword(&umtx->u_owner, owner, owner | UMTX_CONTESTED); 646112904Sjeff 647112904Sjeff /* The address was invalid. */ 648112967Sjake if (old == -1) { 649143149Sdavidxu umtxq_lock(&uq->uq_key); 650143149Sdavidxu umtxq_remove(uq); 651143149Sdavidxu umtxq_unlock(&uq->uq_key); 652143149Sdavidxu umtx_key_release(&uq->uq_key); 653115765Sjeff return (EFAULT); 654112904Sjeff } 655112904Sjeff 656112904Sjeff /* 657115765Sjeff * We set the contested bit, sleep. Otherwise the lock changed 658117685Smtm * and we need to retry or we lost a race to the thread 659117685Smtm * unlocking the umtx. 660112904Sjeff */ 661143149Sdavidxu umtxq_lock(&uq->uq_key); 662161678Sdavidxu if (old == owner) 663161678Sdavidxu error = umtxq_sleep(uq, "umtx", timo); 664143149Sdavidxu umtxq_remove(uq); 665143149Sdavidxu umtxq_unlock(&uq->uq_key); 666143149Sdavidxu umtx_key_release(&uq->uq_key); 667112904Sjeff } 668117743Smtm 669117743Smtm return (0); 670112904Sjeff} 671112904Sjeff 672161678Sdavidxu/* 673161678Sdavidxu * Lock a umtx object. 674161678Sdavidxu */ 675139013Sdavidxustatic int 676163449Sdavidxudo_lock_umtx(struct thread *td, struct umtx *umtx, u_long id, 677140245Sdavidxu struct timespec *timeout) 678112904Sjeff{ 679140245Sdavidxu struct timespec ts, ts2, ts3; 680139013Sdavidxu struct timeval tv; 681140245Sdavidxu int error; 682139013Sdavidxu 683140245Sdavidxu if (timeout == NULL) { 684162536Sdavidxu error = _do_lock_umtx(td, umtx, id, 0); 685162030Sdavidxu /* Mutex locking is restarted if it is interrupted. */ 686162030Sdavidxu if (error == EINTR) 687162030Sdavidxu error = ERESTART; 688139013Sdavidxu } else { 689140245Sdavidxu getnanouptime(&ts); 690140245Sdavidxu timespecadd(&ts, timeout); 691140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 692139013Sdavidxu for (;;) { 693162536Sdavidxu error = _do_lock_umtx(td, umtx, id, tvtohz(&tv)); 694140245Sdavidxu if (error != ETIMEDOUT) 695140245Sdavidxu break; 696140245Sdavidxu getnanouptime(&ts2); 697140245Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 698139751Sdavidxu error = ETIMEDOUT; 699139013Sdavidxu break; 700139013Sdavidxu } 701140245Sdavidxu ts3 = ts; 702140245Sdavidxu timespecsub(&ts3, &ts2); 703140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 704139013Sdavidxu } 705162030Sdavidxu /* Timed-locking is not restarted. */ 706162030Sdavidxu if (error == ERESTART) 707162030Sdavidxu error = EINTR; 708139013Sdavidxu } 709139013Sdavidxu return (error); 710139013Sdavidxu} 711139013Sdavidxu 712161678Sdavidxu/* 713161678Sdavidxu * Unlock a umtx object. 714161678Sdavidxu */ 715139013Sdavidxustatic int 716163449Sdavidxudo_unlock_umtx(struct thread *td, struct umtx *umtx, u_long id) 717139013Sdavidxu{ 718139013Sdavidxu struct umtx_key key; 719163449Sdavidxu u_long owner; 720163449Sdavidxu u_long old; 721139257Sdavidxu int error; 722139257Sdavidxu int count; 723112904Sjeff 724112904Sjeff /* 725112904Sjeff * Make sure we own this mtx. 726112904Sjeff */ 727163449Sdavidxu owner = fuword(__DEVOLATILE(u_long *, &umtx->u_owner)); 728161678Sdavidxu if (owner == -1) 729115765Sjeff return (EFAULT); 730115765Sjeff 731139013Sdavidxu if ((owner & ~UMTX_CONTESTED) != id) 732115765Sjeff return (EPERM); 733112904Sjeff 734161678Sdavidxu /* This should be done in userland */ 735161678Sdavidxu if ((owner & UMTX_CONTESTED) == 0) { 736163449Sdavidxu old = casuword(&umtx->u_owner, owner, UMTX_UNOWNED); 737161678Sdavidxu if (old == -1) 738161678Sdavidxu return (EFAULT); 739161678Sdavidxu if (old == owner) 740161678Sdavidxu return (0); 741161855Sdavidxu owner = old; 742161678Sdavidxu } 743161678Sdavidxu 744117685Smtm /* We should only ever be in here for contested locks */ 745161678Sdavidxu if ((error = umtx_key_get(umtx, TYPE_SIMPLE_LOCK, AUTO_SHARE, 746161678Sdavidxu &key)) != 0) 747139257Sdavidxu return (error); 748139257Sdavidxu 749139257Sdavidxu umtxq_lock(&key); 750139257Sdavidxu umtxq_busy(&key); 751139257Sdavidxu count = umtxq_count(&key); 752139257Sdavidxu umtxq_unlock(&key); 753139257Sdavidxu 754117743Smtm /* 755117743Smtm * When unlocking the umtx, it must be marked as unowned if 756117743Smtm * there is zero or one thread only waiting for it. 757117743Smtm * Otherwise, it must be marked as contested. 758117743Smtm */ 759163449Sdavidxu old = casuword(&umtx->u_owner, owner, 760163449Sdavidxu count <= 1 ? UMTX_UNOWNED : UMTX_CONTESTED); 761139257Sdavidxu umtxq_lock(&key); 762161678Sdavidxu umtxq_signal(&key,1); 763139257Sdavidxu umtxq_unbusy(&key); 764139257Sdavidxu umtxq_unlock(&key); 765139257Sdavidxu umtx_key_release(&key); 766115765Sjeff if (old == -1) 767115765Sjeff return (EFAULT); 768138224Sdavidxu if (old != owner) 769138224Sdavidxu return (EINVAL); 770115765Sjeff return (0); 771112904Sjeff} 772139013Sdavidxu 773205014Snwhitehorn#ifdef COMPAT_FREEBSD32 774162536Sdavidxu 775161678Sdavidxu/* 776162536Sdavidxu * Lock a umtx object. 777162536Sdavidxu */ 778162536Sdavidxustatic int 779162536Sdavidxu_do_lock_umtx32(struct thread *td, uint32_t *m, uint32_t id, int timo) 780162536Sdavidxu{ 781162536Sdavidxu struct umtx_q *uq; 782162536Sdavidxu uint32_t owner; 783162536Sdavidxu uint32_t old; 784162536Sdavidxu int error = 0; 785162536Sdavidxu 786162536Sdavidxu uq = td->td_umtxq; 787162536Sdavidxu 788162536Sdavidxu /* 789162536Sdavidxu * Care must be exercised when dealing with umtx structure. It 790162536Sdavidxu * can fault on any access. 791162536Sdavidxu */ 792162536Sdavidxu for (;;) { 793162536Sdavidxu /* 794162536Sdavidxu * Try the uncontested case. This should be done in userland. 795162536Sdavidxu */ 796162536Sdavidxu owner = casuword32(m, UMUTEX_UNOWNED, id); 797162536Sdavidxu 798162536Sdavidxu /* The acquire succeeded. */ 799162536Sdavidxu if (owner == UMUTEX_UNOWNED) 800162536Sdavidxu return (0); 801162536Sdavidxu 802162536Sdavidxu /* The address was invalid. */ 803162536Sdavidxu if (owner == -1) 804162536Sdavidxu return (EFAULT); 805162536Sdavidxu 806162536Sdavidxu /* If no one owns it but it is contested try to acquire it. */ 807162536Sdavidxu if (owner == UMUTEX_CONTESTED) { 808162536Sdavidxu owner = casuword32(m, 809162536Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 810162536Sdavidxu if (owner == UMUTEX_CONTESTED) 811162536Sdavidxu return (0); 812162536Sdavidxu 813162536Sdavidxu /* The address was invalid. */ 814162536Sdavidxu if (owner == -1) 815162536Sdavidxu return (EFAULT); 816162536Sdavidxu 817162536Sdavidxu /* If this failed the lock has changed, restart. */ 818162536Sdavidxu continue; 819162536Sdavidxu } 820162536Sdavidxu 821162536Sdavidxu /* 822162536Sdavidxu * If we caught a signal, we have retried and now 823162536Sdavidxu * exit immediately. 824162536Sdavidxu */ 825162536Sdavidxu if (error != 0) 826162536Sdavidxu return (error); 827162536Sdavidxu 828162536Sdavidxu if ((error = umtx_key_get(m, TYPE_SIMPLE_LOCK, 829162536Sdavidxu AUTO_SHARE, &uq->uq_key)) != 0) 830162536Sdavidxu return (error); 831162536Sdavidxu 832162536Sdavidxu umtxq_lock(&uq->uq_key); 833162536Sdavidxu umtxq_busy(&uq->uq_key); 834162536Sdavidxu umtxq_insert(uq); 835162536Sdavidxu umtxq_unbusy(&uq->uq_key); 836162536Sdavidxu umtxq_unlock(&uq->uq_key); 837162536Sdavidxu 838162536Sdavidxu /* 839162536Sdavidxu * Set the contested bit so that a release in user space 840162536Sdavidxu * knows to use the system call for unlock. If this fails 841162536Sdavidxu * either some one else has acquired the lock or it has been 842162536Sdavidxu * released. 843162536Sdavidxu */ 844162536Sdavidxu old = casuword32(m, owner, owner | UMUTEX_CONTESTED); 845162536Sdavidxu 846162536Sdavidxu /* The address was invalid. */ 847162536Sdavidxu if (old == -1) { 848162536Sdavidxu umtxq_lock(&uq->uq_key); 849162536Sdavidxu umtxq_remove(uq); 850162536Sdavidxu umtxq_unlock(&uq->uq_key); 851162536Sdavidxu umtx_key_release(&uq->uq_key); 852162536Sdavidxu return (EFAULT); 853162536Sdavidxu } 854162536Sdavidxu 855162536Sdavidxu /* 856162536Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 857162536Sdavidxu * and we need to retry or we lost a race to the thread 858162536Sdavidxu * unlocking the umtx. 859162536Sdavidxu */ 860162536Sdavidxu umtxq_lock(&uq->uq_key); 861162536Sdavidxu if (old == owner) 862162536Sdavidxu error = umtxq_sleep(uq, "umtx", timo); 863162536Sdavidxu umtxq_remove(uq); 864162536Sdavidxu umtxq_unlock(&uq->uq_key); 865162536Sdavidxu umtx_key_release(&uq->uq_key); 866162536Sdavidxu } 867162536Sdavidxu 868162536Sdavidxu return (0); 869162536Sdavidxu} 870162536Sdavidxu 871162536Sdavidxu/* 872162536Sdavidxu * Lock a umtx object. 873162536Sdavidxu */ 874162536Sdavidxustatic int 875162536Sdavidxudo_lock_umtx32(struct thread *td, void *m, uint32_t id, 876162536Sdavidxu struct timespec *timeout) 877162536Sdavidxu{ 878162536Sdavidxu struct timespec ts, ts2, ts3; 879162536Sdavidxu struct timeval tv; 880162536Sdavidxu int error; 881162536Sdavidxu 882162536Sdavidxu if (timeout == NULL) { 883162536Sdavidxu error = _do_lock_umtx32(td, m, id, 0); 884162536Sdavidxu /* Mutex locking is restarted if it is interrupted. */ 885162536Sdavidxu if (error == EINTR) 886162536Sdavidxu error = ERESTART; 887162536Sdavidxu } else { 888162536Sdavidxu getnanouptime(&ts); 889162536Sdavidxu timespecadd(&ts, timeout); 890162536Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 891162536Sdavidxu for (;;) { 892162536Sdavidxu error = _do_lock_umtx32(td, m, id, tvtohz(&tv)); 893162536Sdavidxu if (error != ETIMEDOUT) 894162536Sdavidxu break; 895162536Sdavidxu getnanouptime(&ts2); 896162536Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 897162536Sdavidxu error = ETIMEDOUT; 898162536Sdavidxu break; 899162536Sdavidxu } 900162536Sdavidxu ts3 = ts; 901162536Sdavidxu timespecsub(&ts3, &ts2); 902162536Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 903162536Sdavidxu } 904162536Sdavidxu /* Timed-locking is not restarted. */ 905162536Sdavidxu if (error == ERESTART) 906162536Sdavidxu error = EINTR; 907162536Sdavidxu } 908162536Sdavidxu return (error); 909162536Sdavidxu} 910162536Sdavidxu 911162536Sdavidxu/* 912162536Sdavidxu * Unlock a umtx object. 913162536Sdavidxu */ 914162536Sdavidxustatic int 915162536Sdavidxudo_unlock_umtx32(struct thread *td, uint32_t *m, uint32_t id) 916162536Sdavidxu{ 917162536Sdavidxu struct umtx_key key; 918162536Sdavidxu uint32_t owner; 919162536Sdavidxu uint32_t old; 920162536Sdavidxu int error; 921162536Sdavidxu int count; 922162536Sdavidxu 923162536Sdavidxu /* 924162536Sdavidxu * Make sure we own this mtx. 925162536Sdavidxu */ 926162536Sdavidxu owner = fuword32(m); 927162536Sdavidxu if (owner == -1) 928162536Sdavidxu return (EFAULT); 929162536Sdavidxu 930162536Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 931162536Sdavidxu return (EPERM); 932162536Sdavidxu 933162536Sdavidxu /* This should be done in userland */ 934162536Sdavidxu if ((owner & UMUTEX_CONTESTED) == 0) { 935162536Sdavidxu old = casuword32(m, owner, UMUTEX_UNOWNED); 936162536Sdavidxu if (old == -1) 937162536Sdavidxu return (EFAULT); 938162536Sdavidxu if (old == owner) 939162536Sdavidxu return (0); 940162536Sdavidxu owner = old; 941162536Sdavidxu } 942162536Sdavidxu 943162536Sdavidxu /* We should only ever be in here for contested locks */ 944162536Sdavidxu if ((error = umtx_key_get(m, TYPE_SIMPLE_LOCK, AUTO_SHARE, 945162536Sdavidxu &key)) != 0) 946162536Sdavidxu return (error); 947162536Sdavidxu 948162536Sdavidxu umtxq_lock(&key); 949162536Sdavidxu umtxq_busy(&key); 950162536Sdavidxu count = umtxq_count(&key); 951162536Sdavidxu umtxq_unlock(&key); 952162536Sdavidxu 953162536Sdavidxu /* 954162536Sdavidxu * When unlocking the umtx, it must be marked as unowned if 955162536Sdavidxu * there is zero or one thread only waiting for it. 956162536Sdavidxu * Otherwise, it must be marked as contested. 957162536Sdavidxu */ 958162536Sdavidxu old = casuword32(m, owner, 959162536Sdavidxu count <= 1 ? UMUTEX_UNOWNED : UMUTEX_CONTESTED); 960162536Sdavidxu umtxq_lock(&key); 961162536Sdavidxu umtxq_signal(&key,1); 962162536Sdavidxu umtxq_unbusy(&key); 963162536Sdavidxu umtxq_unlock(&key); 964162536Sdavidxu umtx_key_release(&key); 965162536Sdavidxu if (old == -1) 966162536Sdavidxu return (EFAULT); 967162536Sdavidxu if (old != owner) 968162536Sdavidxu return (EINVAL); 969162536Sdavidxu return (0); 970162536Sdavidxu} 971162536Sdavidxu#endif 972162536Sdavidxu 973162536Sdavidxu/* 974161678Sdavidxu * Fetch and compare value, sleep on the address if value is not changed. 975161678Sdavidxu */ 976139013Sdavidxustatic int 977163449Sdavidxudo_wait(struct thread *td, void *addr, u_long id, 978178646Sdavidxu struct timespec *timeout, int compat32, int is_private) 979139013Sdavidxu{ 980143149Sdavidxu struct umtx_q *uq; 981140245Sdavidxu struct timespec ts, ts2, ts3; 982139013Sdavidxu struct timeval tv; 983163449Sdavidxu u_long tmp; 984140245Sdavidxu int error = 0; 985139013Sdavidxu 986143149Sdavidxu uq = td->td_umtxq; 987178646Sdavidxu if ((error = umtx_key_get(addr, TYPE_SIMPLE_WAIT, 988178646Sdavidxu is_private ? THREAD_SHARE : AUTO_SHARE, &uq->uq_key)) != 0) 989139013Sdavidxu return (error); 990161678Sdavidxu 991161678Sdavidxu umtxq_lock(&uq->uq_key); 992161678Sdavidxu umtxq_insert(uq); 993161678Sdavidxu umtxq_unlock(&uq->uq_key); 994162536Sdavidxu if (compat32 == 0) 995162536Sdavidxu tmp = fuword(addr); 996162536Sdavidxu else 997190987Sdavidxu tmp = (unsigned int)fuword32(addr); 998139427Sdavidxu if (tmp != id) { 999143149Sdavidxu umtxq_lock(&uq->uq_key); 1000143149Sdavidxu umtxq_remove(uq); 1001143149Sdavidxu umtxq_unlock(&uq->uq_key); 1002140245Sdavidxu } else if (timeout == NULL) { 1003143149Sdavidxu umtxq_lock(&uq->uq_key); 1004164839Sdavidxu error = umtxq_sleep(uq, "uwait", 0); 1005161678Sdavidxu umtxq_remove(uq); 1006143149Sdavidxu umtxq_unlock(&uq->uq_key); 1007139013Sdavidxu } else { 1008140245Sdavidxu getnanouptime(&ts); 1009140245Sdavidxu timespecadd(&ts, timeout); 1010140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 1011161678Sdavidxu umtxq_lock(&uq->uq_key); 1012139013Sdavidxu for (;;) { 1013164839Sdavidxu error = umtxq_sleep(uq, "uwait", tvtohz(&tv)); 1014211794Sdavidxu if (!(uq->uq_flags & UQF_UMTXQ)) { 1015211794Sdavidxu error = 0; 1016161678Sdavidxu break; 1017211794Sdavidxu } 1018140245Sdavidxu if (error != ETIMEDOUT) 1019140245Sdavidxu break; 1020161678Sdavidxu umtxq_unlock(&uq->uq_key); 1021140245Sdavidxu getnanouptime(&ts2); 1022140245Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 1023139751Sdavidxu error = ETIMEDOUT; 1024161678Sdavidxu umtxq_lock(&uq->uq_key); 1025139013Sdavidxu break; 1026139013Sdavidxu } 1027140245Sdavidxu ts3 = ts; 1028140245Sdavidxu timespecsub(&ts3, &ts2); 1029140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 1030161678Sdavidxu umtxq_lock(&uq->uq_key); 1031139013Sdavidxu } 1032143149Sdavidxu umtxq_remove(uq); 1033143149Sdavidxu umtxq_unlock(&uq->uq_key); 1034139013Sdavidxu } 1035143149Sdavidxu umtx_key_release(&uq->uq_key); 1036139257Sdavidxu if (error == ERESTART) 1037139257Sdavidxu error = EINTR; 1038139013Sdavidxu return (error); 1039139013Sdavidxu} 1040139013Sdavidxu 1041161678Sdavidxu/* 1042161678Sdavidxu * Wake up threads sleeping on the specified address. 1043161678Sdavidxu */ 1044151692Sdavidxuint 1045178646Sdavidxukern_umtx_wake(struct thread *td, void *uaddr, int n_wake, int is_private) 1046139013Sdavidxu{ 1047139013Sdavidxu struct umtx_key key; 1048139257Sdavidxu int ret; 1049139013Sdavidxu 1050178646Sdavidxu if ((ret = umtx_key_get(uaddr, TYPE_SIMPLE_WAIT, 1051178646Sdavidxu is_private ? THREAD_SHARE : AUTO_SHARE, &key)) != 0) 1052139257Sdavidxu return (ret); 1053139258Sdavidxu umtxq_lock(&key); 1054139257Sdavidxu ret = umtxq_signal(&key, n_wake); 1055139258Sdavidxu umtxq_unlock(&key); 1056139257Sdavidxu umtx_key_release(&key); 1057139013Sdavidxu return (0); 1058139013Sdavidxu} 1059139013Sdavidxu 1060161678Sdavidxu/* 1061161678Sdavidxu * Lock PTHREAD_PRIO_NONE protocol POSIX mutex. 1062161678Sdavidxu */ 1063161678Sdavidxustatic int 1064161678Sdavidxu_do_lock_normal(struct thread *td, struct umutex *m, uint32_t flags, int timo, 1065179970Sdavidxu int mode) 1066161678Sdavidxu{ 1067161678Sdavidxu struct umtx_q *uq; 1068161678Sdavidxu uint32_t owner, old, id; 1069161678Sdavidxu int error = 0; 1070161678Sdavidxu 1071161678Sdavidxu id = td->td_tid; 1072161678Sdavidxu uq = td->td_umtxq; 1073161678Sdavidxu 1074161678Sdavidxu /* 1075161678Sdavidxu * Care must be exercised when dealing with umtx structure. It 1076161678Sdavidxu * can fault on any access. 1077161678Sdavidxu */ 1078161678Sdavidxu for (;;) { 1079179970Sdavidxu owner = fuword32(__DEVOLATILE(void *, &m->m_owner)); 1080179970Sdavidxu if (mode == _UMUTEX_WAIT) { 1081179970Sdavidxu if (owner == UMUTEX_UNOWNED || owner == UMUTEX_CONTESTED) 1082179970Sdavidxu return (0); 1083179970Sdavidxu } else { 1084179970Sdavidxu /* 1085179970Sdavidxu * Try the uncontested case. This should be done in userland. 1086179970Sdavidxu */ 1087179970Sdavidxu owner = casuword32(&m->m_owner, UMUTEX_UNOWNED, id); 1088161678Sdavidxu 1089179970Sdavidxu /* The acquire succeeded. */ 1090179970Sdavidxu if (owner == UMUTEX_UNOWNED) 1091161678Sdavidxu return (0); 1092161678Sdavidxu 1093161678Sdavidxu /* The address was invalid. */ 1094161678Sdavidxu if (owner == -1) 1095161678Sdavidxu return (EFAULT); 1096161678Sdavidxu 1097179970Sdavidxu /* If no one owns it but it is contested try to acquire it. */ 1098179970Sdavidxu if (owner == UMUTEX_CONTESTED) { 1099179970Sdavidxu owner = casuword32(&m->m_owner, 1100179970Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 1101179970Sdavidxu 1102179970Sdavidxu if (owner == UMUTEX_CONTESTED) 1103179970Sdavidxu return (0); 1104179970Sdavidxu 1105179970Sdavidxu /* The address was invalid. */ 1106179970Sdavidxu if (owner == -1) 1107179970Sdavidxu return (EFAULT); 1108179970Sdavidxu 1109179970Sdavidxu /* If this failed the lock has changed, restart. */ 1110179970Sdavidxu continue; 1111179970Sdavidxu } 1112161678Sdavidxu } 1113161678Sdavidxu 1114161678Sdavidxu if ((flags & UMUTEX_ERROR_CHECK) != 0 && 1115161678Sdavidxu (owner & ~UMUTEX_CONTESTED) == id) 1116161678Sdavidxu return (EDEADLK); 1117161678Sdavidxu 1118179970Sdavidxu if (mode == _UMUTEX_TRY) 1119161678Sdavidxu return (EBUSY); 1120161678Sdavidxu 1121161678Sdavidxu /* 1122161678Sdavidxu * If we caught a signal, we have retried and now 1123161678Sdavidxu * exit immediately. 1124161678Sdavidxu */ 1125161678Sdavidxu if (error != 0) 1126161678Sdavidxu return (error); 1127161678Sdavidxu 1128161678Sdavidxu if ((error = umtx_key_get(m, TYPE_NORMAL_UMUTEX, 1129161678Sdavidxu GET_SHARE(flags), &uq->uq_key)) != 0) 1130161678Sdavidxu return (error); 1131161678Sdavidxu 1132161678Sdavidxu umtxq_lock(&uq->uq_key); 1133161678Sdavidxu umtxq_busy(&uq->uq_key); 1134161678Sdavidxu umtxq_insert(uq); 1135161678Sdavidxu umtxq_unlock(&uq->uq_key); 1136161678Sdavidxu 1137161678Sdavidxu /* 1138161678Sdavidxu * Set the contested bit so that a release in user space 1139161678Sdavidxu * knows to use the system call for unlock. If this fails 1140161678Sdavidxu * either some one else has acquired the lock or it has been 1141161678Sdavidxu * released. 1142161678Sdavidxu */ 1143161678Sdavidxu old = casuword32(&m->m_owner, owner, owner | UMUTEX_CONTESTED); 1144161678Sdavidxu 1145161678Sdavidxu /* The address was invalid. */ 1146161678Sdavidxu if (old == -1) { 1147161678Sdavidxu umtxq_lock(&uq->uq_key); 1148161678Sdavidxu umtxq_remove(uq); 1149179970Sdavidxu umtxq_unbusy(&uq->uq_key); 1150161678Sdavidxu umtxq_unlock(&uq->uq_key); 1151161678Sdavidxu umtx_key_release(&uq->uq_key); 1152161678Sdavidxu return (EFAULT); 1153161678Sdavidxu } 1154161678Sdavidxu 1155161678Sdavidxu /* 1156161678Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 1157161678Sdavidxu * and we need to retry or we lost a race to the thread 1158161678Sdavidxu * unlocking the umtx. 1159161678Sdavidxu */ 1160161678Sdavidxu umtxq_lock(&uq->uq_key); 1161179970Sdavidxu umtxq_unbusy(&uq->uq_key); 1162161678Sdavidxu if (old == owner) 1163161678Sdavidxu error = umtxq_sleep(uq, "umtxn", timo); 1164161678Sdavidxu umtxq_remove(uq); 1165161678Sdavidxu umtxq_unlock(&uq->uq_key); 1166161678Sdavidxu umtx_key_release(&uq->uq_key); 1167161678Sdavidxu } 1168161678Sdavidxu 1169161678Sdavidxu return (0); 1170161678Sdavidxu} 1171161678Sdavidxu 1172161678Sdavidxu/* 1173161678Sdavidxu * Lock PTHREAD_PRIO_NONE protocol POSIX mutex. 1174161678Sdavidxu */ 1175161678Sdavidxu/* 1176161678Sdavidxu * Unlock PTHREAD_PRIO_NONE protocol POSIX mutex. 1177161678Sdavidxu */ 1178161678Sdavidxustatic int 1179161678Sdavidxudo_unlock_normal(struct thread *td, struct umutex *m, uint32_t flags) 1180161678Sdavidxu{ 1181161678Sdavidxu struct umtx_key key; 1182161678Sdavidxu uint32_t owner, old, id; 1183161678Sdavidxu int error; 1184161678Sdavidxu int count; 1185161678Sdavidxu 1186161678Sdavidxu id = td->td_tid; 1187161678Sdavidxu /* 1188161678Sdavidxu * Make sure we own this mtx. 1189161678Sdavidxu */ 1190163449Sdavidxu owner = fuword32(__DEVOLATILE(uint32_t *, &m->m_owner)); 1191161678Sdavidxu if (owner == -1) 1192161678Sdavidxu return (EFAULT); 1193161678Sdavidxu 1194161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 1195161678Sdavidxu return (EPERM); 1196161678Sdavidxu 1197161678Sdavidxu if ((owner & UMUTEX_CONTESTED) == 0) { 1198161678Sdavidxu old = casuword32(&m->m_owner, owner, UMUTEX_UNOWNED); 1199161678Sdavidxu if (old == -1) 1200161678Sdavidxu return (EFAULT); 1201161678Sdavidxu if (old == owner) 1202161678Sdavidxu return (0); 1203161855Sdavidxu owner = old; 1204161678Sdavidxu } 1205161678Sdavidxu 1206161678Sdavidxu /* We should only ever be in here for contested locks */ 1207161678Sdavidxu if ((error = umtx_key_get(m, TYPE_NORMAL_UMUTEX, GET_SHARE(flags), 1208161678Sdavidxu &key)) != 0) 1209161678Sdavidxu return (error); 1210161678Sdavidxu 1211161678Sdavidxu umtxq_lock(&key); 1212161678Sdavidxu umtxq_busy(&key); 1213161678Sdavidxu count = umtxq_count(&key); 1214161678Sdavidxu umtxq_unlock(&key); 1215161678Sdavidxu 1216161678Sdavidxu /* 1217161678Sdavidxu * When unlocking the umtx, it must be marked as unowned if 1218161678Sdavidxu * there is zero or one thread only waiting for it. 1219161678Sdavidxu * Otherwise, it must be marked as contested. 1220161678Sdavidxu */ 1221161678Sdavidxu old = casuword32(&m->m_owner, owner, 1222161678Sdavidxu count <= 1 ? UMUTEX_UNOWNED : UMUTEX_CONTESTED); 1223161678Sdavidxu umtxq_lock(&key); 1224161678Sdavidxu umtxq_signal(&key,1); 1225161678Sdavidxu umtxq_unbusy(&key); 1226161678Sdavidxu umtxq_unlock(&key); 1227161678Sdavidxu umtx_key_release(&key); 1228161678Sdavidxu if (old == -1) 1229161678Sdavidxu return (EFAULT); 1230161678Sdavidxu if (old != owner) 1231161678Sdavidxu return (EINVAL); 1232161678Sdavidxu return (0); 1233161678Sdavidxu} 1234161678Sdavidxu 1235179970Sdavidxu/* 1236179970Sdavidxu * Check if the mutex is available and wake up a waiter, 1237179970Sdavidxu * only for simple mutex. 1238179970Sdavidxu */ 1239179970Sdavidxustatic int 1240179970Sdavidxudo_wake_umutex(struct thread *td, struct umutex *m) 1241179970Sdavidxu{ 1242179970Sdavidxu struct umtx_key key; 1243179970Sdavidxu uint32_t owner; 1244179970Sdavidxu uint32_t flags; 1245179970Sdavidxu int error; 1246179970Sdavidxu int count; 1247179970Sdavidxu 1248179970Sdavidxu owner = fuword32(__DEVOLATILE(uint32_t *, &m->m_owner)); 1249179970Sdavidxu if (owner == -1) 1250179970Sdavidxu return (EFAULT); 1251179970Sdavidxu 1252179970Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != 0) 1253179970Sdavidxu return (0); 1254179970Sdavidxu 1255179970Sdavidxu flags = fuword32(&m->m_flags); 1256179970Sdavidxu 1257179970Sdavidxu /* We should only ever be in here for contested locks */ 1258179970Sdavidxu if ((error = umtx_key_get(m, TYPE_NORMAL_UMUTEX, GET_SHARE(flags), 1259179970Sdavidxu &key)) != 0) 1260179970Sdavidxu return (error); 1261179970Sdavidxu 1262179970Sdavidxu umtxq_lock(&key); 1263179970Sdavidxu umtxq_busy(&key); 1264179970Sdavidxu count = umtxq_count(&key); 1265179970Sdavidxu umtxq_unlock(&key); 1266179970Sdavidxu 1267179970Sdavidxu if (count <= 1) 1268179970Sdavidxu owner = casuword32(&m->m_owner, UMUTEX_CONTESTED, UMUTEX_UNOWNED); 1269179970Sdavidxu 1270179970Sdavidxu umtxq_lock(&key); 1271179970Sdavidxu if (count != 0 && (owner & ~UMUTEX_CONTESTED) == 0) 1272179970Sdavidxu umtxq_signal(&key, 1); 1273179970Sdavidxu umtxq_unbusy(&key); 1274179970Sdavidxu umtxq_unlock(&key); 1275179970Sdavidxu umtx_key_release(&key); 1276179970Sdavidxu return (0); 1277179970Sdavidxu} 1278179970Sdavidxu 1279161678Sdavidxustatic inline struct umtx_pi * 1280163697Sdavidxuumtx_pi_alloc(int flags) 1281161678Sdavidxu{ 1282161678Sdavidxu struct umtx_pi *pi; 1283161678Sdavidxu 1284163697Sdavidxu pi = uma_zalloc(umtx_pi_zone, M_ZERO | flags); 1285161678Sdavidxu TAILQ_INIT(&pi->pi_blocked); 1286161678Sdavidxu atomic_add_int(&umtx_pi_allocated, 1); 1287161678Sdavidxu return (pi); 1288161678Sdavidxu} 1289161678Sdavidxu 1290161678Sdavidxustatic inline void 1291161678Sdavidxuumtx_pi_free(struct umtx_pi *pi) 1292161678Sdavidxu{ 1293161678Sdavidxu uma_zfree(umtx_pi_zone, pi); 1294161678Sdavidxu atomic_add_int(&umtx_pi_allocated, -1); 1295161678Sdavidxu} 1296161678Sdavidxu 1297161678Sdavidxu/* 1298161678Sdavidxu * Adjust the thread's position on a pi_state after its priority has been 1299161678Sdavidxu * changed. 1300161678Sdavidxu */ 1301161678Sdavidxustatic int 1302161678Sdavidxuumtx_pi_adjust_thread(struct umtx_pi *pi, struct thread *td) 1303161678Sdavidxu{ 1304161678Sdavidxu struct umtx_q *uq, *uq1, *uq2; 1305161678Sdavidxu struct thread *td1; 1306161678Sdavidxu 1307170300Sjeff mtx_assert(&umtx_lock, MA_OWNED); 1308161678Sdavidxu if (pi == NULL) 1309161678Sdavidxu return (0); 1310161678Sdavidxu 1311161678Sdavidxu uq = td->td_umtxq; 1312161678Sdavidxu 1313161678Sdavidxu /* 1314161678Sdavidxu * Check if the thread needs to be moved on the blocked chain. 1315161678Sdavidxu * It needs to be moved if either its priority is lower than 1316161678Sdavidxu * the previous thread or higher than the next thread. 1317161678Sdavidxu */ 1318161678Sdavidxu uq1 = TAILQ_PREV(uq, umtxq_head, uq_lockq); 1319161678Sdavidxu uq2 = TAILQ_NEXT(uq, uq_lockq); 1320161678Sdavidxu if ((uq1 != NULL && UPRI(td) < UPRI(uq1->uq_thread)) || 1321161678Sdavidxu (uq2 != NULL && UPRI(td) > UPRI(uq2->uq_thread))) { 1322161678Sdavidxu /* 1323161678Sdavidxu * Remove thread from blocked chain and determine where 1324161678Sdavidxu * it should be moved to. 1325161678Sdavidxu */ 1326161678Sdavidxu TAILQ_REMOVE(&pi->pi_blocked, uq, uq_lockq); 1327161678Sdavidxu TAILQ_FOREACH(uq1, &pi->pi_blocked, uq_lockq) { 1328161678Sdavidxu td1 = uq1->uq_thread; 1329161678Sdavidxu MPASS(td1->td_proc->p_magic == P_MAGIC); 1330161678Sdavidxu if (UPRI(td1) > UPRI(td)) 1331161678Sdavidxu break; 1332161678Sdavidxu } 1333161678Sdavidxu 1334161678Sdavidxu if (uq1 == NULL) 1335161678Sdavidxu TAILQ_INSERT_TAIL(&pi->pi_blocked, uq, uq_lockq); 1336161678Sdavidxu else 1337161678Sdavidxu TAILQ_INSERT_BEFORE(uq1, uq, uq_lockq); 1338161678Sdavidxu } 1339161678Sdavidxu return (1); 1340161678Sdavidxu} 1341161678Sdavidxu 1342161678Sdavidxu/* 1343161678Sdavidxu * Propagate priority when a thread is blocked on POSIX 1344161678Sdavidxu * PI mutex. 1345161678Sdavidxu */ 1346161678Sdavidxustatic void 1347161678Sdavidxuumtx_propagate_priority(struct thread *td) 1348161678Sdavidxu{ 1349161678Sdavidxu struct umtx_q *uq; 1350161678Sdavidxu struct umtx_pi *pi; 1351161678Sdavidxu int pri; 1352161678Sdavidxu 1353170300Sjeff mtx_assert(&umtx_lock, MA_OWNED); 1354161678Sdavidxu pri = UPRI(td); 1355161678Sdavidxu uq = td->td_umtxq; 1356161678Sdavidxu pi = uq->uq_pi_blocked; 1357161678Sdavidxu if (pi == NULL) 1358161678Sdavidxu return; 1359161678Sdavidxu 1360161678Sdavidxu for (;;) { 1361161678Sdavidxu td = pi->pi_owner; 1362216313Sdavidxu if (td == NULL || td == curthread) 1363161678Sdavidxu return; 1364161678Sdavidxu 1365161678Sdavidxu MPASS(td->td_proc != NULL); 1366161678Sdavidxu MPASS(td->td_proc->p_magic == P_MAGIC); 1367161678Sdavidxu 1368170300Sjeff thread_lock(td); 1369216313Sdavidxu if (td->td_lend_user_pri > pri) 1370216313Sdavidxu sched_lend_user_prio(td, pri); 1371216313Sdavidxu else { 1372216313Sdavidxu thread_unlock(td); 1373216313Sdavidxu break; 1374216313Sdavidxu } 1375170300Sjeff thread_unlock(td); 1376161678Sdavidxu 1377161678Sdavidxu /* 1378161678Sdavidxu * Pick up the lock that td is blocked on. 1379161678Sdavidxu */ 1380161678Sdavidxu uq = td->td_umtxq; 1381161678Sdavidxu pi = uq->uq_pi_blocked; 1382216791Sdavidxu if (pi == NULL) 1383216791Sdavidxu break; 1384161678Sdavidxu /* Resort td on the list if needed. */ 1385216791Sdavidxu umtx_pi_adjust_thread(pi, td); 1386161678Sdavidxu } 1387161678Sdavidxu} 1388161678Sdavidxu 1389161678Sdavidxu/* 1390161678Sdavidxu * Unpropagate priority for a PI mutex when a thread blocked on 1391161678Sdavidxu * it is interrupted by signal or resumed by others. 1392161678Sdavidxu */ 1393161678Sdavidxustatic void 1394216791Sdavidxuumtx_repropagate_priority(struct umtx_pi *pi) 1395161678Sdavidxu{ 1396161678Sdavidxu struct umtx_q *uq, *uq_owner; 1397161678Sdavidxu struct umtx_pi *pi2; 1398216791Sdavidxu int pri; 1399161678Sdavidxu 1400170300Sjeff mtx_assert(&umtx_lock, MA_OWNED); 1401161678Sdavidxu 1402161678Sdavidxu while (pi != NULL && pi->pi_owner != NULL) { 1403161678Sdavidxu pri = PRI_MAX; 1404161678Sdavidxu uq_owner = pi->pi_owner->td_umtxq; 1405161678Sdavidxu 1406161678Sdavidxu TAILQ_FOREACH(pi2, &uq_owner->uq_pi_contested, pi_link) { 1407161678Sdavidxu uq = TAILQ_FIRST(&pi2->pi_blocked); 1408161678Sdavidxu if (uq != NULL) { 1409161678Sdavidxu if (pri > UPRI(uq->uq_thread)) 1410161678Sdavidxu pri = UPRI(uq->uq_thread); 1411161678Sdavidxu } 1412161678Sdavidxu } 1413161678Sdavidxu 1414161678Sdavidxu if (pri > uq_owner->uq_inherited_pri) 1415161678Sdavidxu pri = uq_owner->uq_inherited_pri; 1416170300Sjeff thread_lock(pi->pi_owner); 1417216791Sdavidxu sched_lend_user_prio(pi->pi_owner, pri); 1418170300Sjeff thread_unlock(pi->pi_owner); 1419216791Sdavidxu if ((pi = uq_owner->uq_pi_blocked) != NULL) 1420216791Sdavidxu umtx_pi_adjust_thread(pi, uq_owner->uq_thread); 1421161678Sdavidxu } 1422161678Sdavidxu} 1423161678Sdavidxu 1424161678Sdavidxu/* 1425161678Sdavidxu * Insert a PI mutex into owned list. 1426161678Sdavidxu */ 1427161678Sdavidxustatic void 1428161678Sdavidxuumtx_pi_setowner(struct umtx_pi *pi, struct thread *owner) 1429161678Sdavidxu{ 1430161678Sdavidxu struct umtx_q *uq_owner; 1431161678Sdavidxu 1432161678Sdavidxu uq_owner = owner->td_umtxq; 1433170300Sjeff mtx_assert(&umtx_lock, MA_OWNED); 1434161678Sdavidxu if (pi->pi_owner != NULL) 1435161678Sdavidxu panic("pi_ower != NULL"); 1436161678Sdavidxu pi->pi_owner = owner; 1437161678Sdavidxu TAILQ_INSERT_TAIL(&uq_owner->uq_pi_contested, pi, pi_link); 1438161678Sdavidxu} 1439161678Sdavidxu 1440161678Sdavidxu/* 1441161678Sdavidxu * Claim ownership of a PI mutex. 1442161678Sdavidxu */ 1443161678Sdavidxustatic int 1444161678Sdavidxuumtx_pi_claim(struct umtx_pi *pi, struct thread *owner) 1445161678Sdavidxu{ 1446161678Sdavidxu struct umtx_q *uq, *uq_owner; 1447161678Sdavidxu 1448161678Sdavidxu uq_owner = owner->td_umtxq; 1449170300Sjeff mtx_lock_spin(&umtx_lock); 1450161678Sdavidxu if (pi->pi_owner == owner) { 1451170300Sjeff mtx_unlock_spin(&umtx_lock); 1452161678Sdavidxu return (0); 1453161678Sdavidxu } 1454161678Sdavidxu 1455161678Sdavidxu if (pi->pi_owner != NULL) { 1456161678Sdavidxu /* 1457161678Sdavidxu * userland may have already messed the mutex, sigh. 1458161678Sdavidxu */ 1459170300Sjeff mtx_unlock_spin(&umtx_lock); 1460161678Sdavidxu return (EPERM); 1461161678Sdavidxu } 1462161678Sdavidxu umtx_pi_setowner(pi, owner); 1463161678Sdavidxu uq = TAILQ_FIRST(&pi->pi_blocked); 1464161678Sdavidxu if (uq != NULL) { 1465161678Sdavidxu int pri; 1466161678Sdavidxu 1467161678Sdavidxu pri = UPRI(uq->uq_thread); 1468170300Sjeff thread_lock(owner); 1469161678Sdavidxu if (pri < UPRI(owner)) 1470161678Sdavidxu sched_lend_user_prio(owner, pri); 1471170300Sjeff thread_unlock(owner); 1472161678Sdavidxu } 1473170300Sjeff mtx_unlock_spin(&umtx_lock); 1474161678Sdavidxu return (0); 1475161678Sdavidxu} 1476161678Sdavidxu 1477161678Sdavidxu/* 1478174701Sdavidxu * Adjust a thread's order position in its blocked PI mutex, 1479174701Sdavidxu * this may result new priority propagating process. 1480174701Sdavidxu */ 1481174701Sdavidxuvoid 1482174701Sdavidxuumtx_pi_adjust(struct thread *td, u_char oldpri) 1483174701Sdavidxu{ 1484174707Sdavidxu struct umtx_q *uq; 1485174707Sdavidxu struct umtx_pi *pi; 1486174707Sdavidxu 1487174707Sdavidxu uq = td->td_umtxq; 1488174701Sdavidxu mtx_lock_spin(&umtx_lock); 1489174707Sdavidxu /* 1490174707Sdavidxu * Pick up the lock that td is blocked on. 1491174707Sdavidxu */ 1492174707Sdavidxu pi = uq->uq_pi_blocked; 1493216791Sdavidxu if (pi != NULL) { 1494216791Sdavidxu umtx_pi_adjust_thread(pi, td); 1495216791Sdavidxu umtx_repropagate_priority(pi); 1496216791Sdavidxu } 1497174701Sdavidxu mtx_unlock_spin(&umtx_lock); 1498174701Sdavidxu} 1499174701Sdavidxu 1500174701Sdavidxu/* 1501161678Sdavidxu * Sleep on a PI mutex. 1502161678Sdavidxu */ 1503161678Sdavidxustatic int 1504161678Sdavidxuumtxq_sleep_pi(struct umtx_q *uq, struct umtx_pi *pi, 1505161678Sdavidxu uint32_t owner, const char *wmesg, int timo) 1506161678Sdavidxu{ 1507161678Sdavidxu struct umtxq_chain *uc; 1508161678Sdavidxu struct thread *td, *td1; 1509161678Sdavidxu struct umtx_q *uq1; 1510161678Sdavidxu int pri; 1511161678Sdavidxu int error = 0; 1512161678Sdavidxu 1513161678Sdavidxu td = uq->uq_thread; 1514161678Sdavidxu KASSERT(td == curthread, ("inconsistent uq_thread")); 1515161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 1516161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1517189756Sdavidxu UMTXQ_BUSY_ASSERT(uc); 1518161678Sdavidxu umtxq_insert(uq); 1519189756Sdavidxu mtx_lock_spin(&umtx_lock); 1520161678Sdavidxu if (pi->pi_owner == NULL) { 1521189756Sdavidxu mtx_unlock_spin(&umtx_lock); 1522213642Sdavidxu /* XXX Only look up thread in current process. */ 1523213642Sdavidxu td1 = tdfind(owner, curproc->p_pid); 1524170300Sjeff mtx_lock_spin(&umtx_lock); 1525215336Sdavidxu if (td1 != NULL) { 1526215336Sdavidxu if (pi->pi_owner == NULL) 1527215336Sdavidxu umtx_pi_setowner(pi, td1); 1528215336Sdavidxu PROC_UNLOCK(td1->td_proc); 1529161678Sdavidxu } 1530161678Sdavidxu } 1531161678Sdavidxu 1532161678Sdavidxu TAILQ_FOREACH(uq1, &pi->pi_blocked, uq_lockq) { 1533161678Sdavidxu pri = UPRI(uq1->uq_thread); 1534161678Sdavidxu if (pri > UPRI(td)) 1535161678Sdavidxu break; 1536161678Sdavidxu } 1537161678Sdavidxu 1538161678Sdavidxu if (uq1 != NULL) 1539161678Sdavidxu TAILQ_INSERT_BEFORE(uq1, uq, uq_lockq); 1540161678Sdavidxu else 1541161678Sdavidxu TAILQ_INSERT_TAIL(&pi->pi_blocked, uq, uq_lockq); 1542161678Sdavidxu 1543161678Sdavidxu uq->uq_pi_blocked = pi; 1544174701Sdavidxu thread_lock(td); 1545161678Sdavidxu td->td_flags |= TDF_UPIBLOCKED; 1546174701Sdavidxu thread_unlock(td); 1547161678Sdavidxu umtx_propagate_priority(td); 1548170300Sjeff mtx_unlock_spin(&umtx_lock); 1549189756Sdavidxu umtxq_unbusy(&uq->uq_key); 1550161678Sdavidxu 1551161678Sdavidxu if (uq->uq_flags & UQF_UMTXQ) { 1552161678Sdavidxu error = msleep(uq, &uc->uc_lock, PCATCH, wmesg, timo); 1553161678Sdavidxu if (error == EWOULDBLOCK) 1554161678Sdavidxu error = ETIMEDOUT; 1555161678Sdavidxu if (uq->uq_flags & UQF_UMTXQ) { 1556161678Sdavidxu umtxq_remove(uq); 1557161678Sdavidxu } 1558161678Sdavidxu } 1559170300Sjeff mtx_lock_spin(&umtx_lock); 1560161678Sdavidxu uq->uq_pi_blocked = NULL; 1561174701Sdavidxu thread_lock(td); 1562161678Sdavidxu td->td_flags &= ~TDF_UPIBLOCKED; 1563174701Sdavidxu thread_unlock(td); 1564161678Sdavidxu TAILQ_REMOVE(&pi->pi_blocked, uq, uq_lockq); 1565216791Sdavidxu umtx_repropagate_priority(pi); 1566170300Sjeff mtx_unlock_spin(&umtx_lock); 1567189756Sdavidxu umtxq_unlock(&uq->uq_key); 1568161678Sdavidxu 1569161678Sdavidxu return (error); 1570161678Sdavidxu} 1571161678Sdavidxu 1572161678Sdavidxu/* 1573161678Sdavidxu * Add reference count for a PI mutex. 1574161678Sdavidxu */ 1575161678Sdavidxustatic void 1576161678Sdavidxuumtx_pi_ref(struct umtx_pi *pi) 1577161678Sdavidxu{ 1578161678Sdavidxu struct umtxq_chain *uc; 1579161678Sdavidxu 1580161678Sdavidxu uc = umtxq_getchain(&pi->pi_key); 1581161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1582161678Sdavidxu pi->pi_refcount++; 1583161678Sdavidxu} 1584161678Sdavidxu 1585161678Sdavidxu/* 1586161678Sdavidxu * Decrease reference count for a PI mutex, if the counter 1587161678Sdavidxu * is decreased to zero, its memory space is freed. 1588161678Sdavidxu */ 1589161678Sdavidxustatic void 1590161678Sdavidxuumtx_pi_unref(struct umtx_pi *pi) 1591161678Sdavidxu{ 1592161678Sdavidxu struct umtxq_chain *uc; 1593161678Sdavidxu 1594161678Sdavidxu uc = umtxq_getchain(&pi->pi_key); 1595161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1596161678Sdavidxu KASSERT(pi->pi_refcount > 0, ("invalid reference count")); 1597161678Sdavidxu if (--pi->pi_refcount == 0) { 1598170300Sjeff mtx_lock_spin(&umtx_lock); 1599161678Sdavidxu if (pi->pi_owner != NULL) { 1600161678Sdavidxu TAILQ_REMOVE(&pi->pi_owner->td_umtxq->uq_pi_contested, 1601161678Sdavidxu pi, pi_link); 1602161678Sdavidxu pi->pi_owner = NULL; 1603161678Sdavidxu } 1604161678Sdavidxu KASSERT(TAILQ_EMPTY(&pi->pi_blocked), 1605161678Sdavidxu ("blocked queue not empty")); 1606170300Sjeff mtx_unlock_spin(&umtx_lock); 1607161678Sdavidxu TAILQ_REMOVE(&uc->uc_pi_list, pi, pi_hashlink); 1608189756Sdavidxu umtx_pi_free(pi); 1609161678Sdavidxu } 1610161678Sdavidxu} 1611161678Sdavidxu 1612161678Sdavidxu/* 1613161678Sdavidxu * Find a PI mutex in hash table. 1614161678Sdavidxu */ 1615161678Sdavidxustatic struct umtx_pi * 1616161678Sdavidxuumtx_pi_lookup(struct umtx_key *key) 1617161678Sdavidxu{ 1618161678Sdavidxu struct umtxq_chain *uc; 1619161678Sdavidxu struct umtx_pi *pi; 1620161678Sdavidxu 1621161678Sdavidxu uc = umtxq_getchain(key); 1622161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1623161678Sdavidxu 1624161678Sdavidxu TAILQ_FOREACH(pi, &uc->uc_pi_list, pi_hashlink) { 1625161678Sdavidxu if (umtx_key_match(&pi->pi_key, key)) { 1626161678Sdavidxu return (pi); 1627161678Sdavidxu } 1628161678Sdavidxu } 1629161678Sdavidxu return (NULL); 1630161678Sdavidxu} 1631161678Sdavidxu 1632161678Sdavidxu/* 1633161678Sdavidxu * Insert a PI mutex into hash table. 1634161678Sdavidxu */ 1635161678Sdavidxustatic inline void 1636161678Sdavidxuumtx_pi_insert(struct umtx_pi *pi) 1637161678Sdavidxu{ 1638161678Sdavidxu struct umtxq_chain *uc; 1639161678Sdavidxu 1640161678Sdavidxu uc = umtxq_getchain(&pi->pi_key); 1641161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1642161678Sdavidxu TAILQ_INSERT_TAIL(&uc->uc_pi_list, pi, pi_hashlink); 1643161678Sdavidxu} 1644161678Sdavidxu 1645161678Sdavidxu/* 1646161678Sdavidxu * Lock a PI mutex. 1647161678Sdavidxu */ 1648161678Sdavidxustatic int 1649161678Sdavidxu_do_lock_pi(struct thread *td, struct umutex *m, uint32_t flags, int timo, 1650161678Sdavidxu int try) 1651161678Sdavidxu{ 1652161678Sdavidxu struct umtx_q *uq; 1653161678Sdavidxu struct umtx_pi *pi, *new_pi; 1654161678Sdavidxu uint32_t id, owner, old; 1655161678Sdavidxu int error; 1656161678Sdavidxu 1657161678Sdavidxu id = td->td_tid; 1658161678Sdavidxu uq = td->td_umtxq; 1659161678Sdavidxu 1660161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PI_UMUTEX, GET_SHARE(flags), 1661161678Sdavidxu &uq->uq_key)) != 0) 1662161678Sdavidxu return (error); 1663163697Sdavidxu umtxq_lock(&uq->uq_key); 1664163697Sdavidxu pi = umtx_pi_lookup(&uq->uq_key); 1665163697Sdavidxu if (pi == NULL) { 1666163697Sdavidxu new_pi = umtx_pi_alloc(M_NOWAIT); 1667163697Sdavidxu if (new_pi == NULL) { 1668161678Sdavidxu umtxq_unlock(&uq->uq_key); 1669163697Sdavidxu new_pi = umtx_pi_alloc(M_WAITOK); 1670161678Sdavidxu umtxq_lock(&uq->uq_key); 1671161678Sdavidxu pi = umtx_pi_lookup(&uq->uq_key); 1672163697Sdavidxu if (pi != NULL) { 1673161678Sdavidxu umtx_pi_free(new_pi); 1674163697Sdavidxu new_pi = NULL; 1675161678Sdavidxu } 1676161678Sdavidxu } 1677163697Sdavidxu if (new_pi != NULL) { 1678163697Sdavidxu new_pi->pi_key = uq->uq_key; 1679163697Sdavidxu umtx_pi_insert(new_pi); 1680163697Sdavidxu pi = new_pi; 1681163697Sdavidxu } 1682163697Sdavidxu } 1683163697Sdavidxu umtx_pi_ref(pi); 1684163697Sdavidxu umtxq_unlock(&uq->uq_key); 1685161678Sdavidxu 1686163697Sdavidxu /* 1687163697Sdavidxu * Care must be exercised when dealing with umtx structure. It 1688163697Sdavidxu * can fault on any access. 1689163697Sdavidxu */ 1690163697Sdavidxu for (;;) { 1691161678Sdavidxu /* 1692161678Sdavidxu * Try the uncontested case. This should be done in userland. 1693161678Sdavidxu */ 1694161678Sdavidxu owner = casuword32(&m->m_owner, UMUTEX_UNOWNED, id); 1695161678Sdavidxu 1696161678Sdavidxu /* The acquire succeeded. */ 1697161678Sdavidxu if (owner == UMUTEX_UNOWNED) { 1698161678Sdavidxu error = 0; 1699161678Sdavidxu break; 1700161678Sdavidxu } 1701161678Sdavidxu 1702161678Sdavidxu /* The address was invalid. */ 1703161678Sdavidxu if (owner == -1) { 1704161678Sdavidxu error = EFAULT; 1705161678Sdavidxu break; 1706161678Sdavidxu } 1707161678Sdavidxu 1708161678Sdavidxu /* If no one owns it but it is contested try to acquire it. */ 1709161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 1710161678Sdavidxu owner = casuword32(&m->m_owner, 1711161678Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 1712161678Sdavidxu 1713161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 1714161678Sdavidxu umtxq_lock(&uq->uq_key); 1715189756Sdavidxu umtxq_busy(&uq->uq_key); 1716161678Sdavidxu error = umtx_pi_claim(pi, td); 1717189756Sdavidxu umtxq_unbusy(&uq->uq_key); 1718161678Sdavidxu umtxq_unlock(&uq->uq_key); 1719161678Sdavidxu break; 1720161678Sdavidxu } 1721161678Sdavidxu 1722161678Sdavidxu /* The address was invalid. */ 1723161678Sdavidxu if (owner == -1) { 1724161678Sdavidxu error = EFAULT; 1725161678Sdavidxu break; 1726161678Sdavidxu } 1727161678Sdavidxu 1728161678Sdavidxu /* If this failed the lock has changed, restart. */ 1729161678Sdavidxu continue; 1730161678Sdavidxu } 1731161678Sdavidxu 1732161678Sdavidxu if ((flags & UMUTEX_ERROR_CHECK) != 0 && 1733161678Sdavidxu (owner & ~UMUTEX_CONTESTED) == id) { 1734161678Sdavidxu error = EDEADLK; 1735161678Sdavidxu break; 1736161678Sdavidxu } 1737161678Sdavidxu 1738161678Sdavidxu if (try != 0) { 1739161678Sdavidxu error = EBUSY; 1740161678Sdavidxu break; 1741161678Sdavidxu } 1742161678Sdavidxu 1743161678Sdavidxu /* 1744161678Sdavidxu * If we caught a signal, we have retried and now 1745161678Sdavidxu * exit immediately. 1746161678Sdavidxu */ 1747161678Sdavidxu if (error != 0) 1748161678Sdavidxu break; 1749161678Sdavidxu 1750161678Sdavidxu umtxq_lock(&uq->uq_key); 1751161678Sdavidxu umtxq_busy(&uq->uq_key); 1752161678Sdavidxu umtxq_unlock(&uq->uq_key); 1753161678Sdavidxu 1754161678Sdavidxu /* 1755161678Sdavidxu * Set the contested bit so that a release in user space 1756161678Sdavidxu * knows to use the system call for unlock. If this fails 1757161678Sdavidxu * either some one else has acquired the lock or it has been 1758161678Sdavidxu * released. 1759161678Sdavidxu */ 1760161678Sdavidxu old = casuword32(&m->m_owner, owner, owner | UMUTEX_CONTESTED); 1761161678Sdavidxu 1762161678Sdavidxu /* The address was invalid. */ 1763161678Sdavidxu if (old == -1) { 1764161678Sdavidxu umtxq_lock(&uq->uq_key); 1765161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1766161678Sdavidxu umtxq_unlock(&uq->uq_key); 1767161678Sdavidxu error = EFAULT; 1768161678Sdavidxu break; 1769161678Sdavidxu } 1770161678Sdavidxu 1771161678Sdavidxu umtxq_lock(&uq->uq_key); 1772161678Sdavidxu /* 1773161678Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 1774161678Sdavidxu * and we need to retry or we lost a race to the thread 1775161678Sdavidxu * unlocking the umtx. 1776161678Sdavidxu */ 1777161678Sdavidxu if (old == owner) 1778161678Sdavidxu error = umtxq_sleep_pi(uq, pi, owner & ~UMUTEX_CONTESTED, 1779161678Sdavidxu "umtxpi", timo); 1780189756Sdavidxu else { 1781189756Sdavidxu umtxq_unbusy(&uq->uq_key); 1782189756Sdavidxu umtxq_unlock(&uq->uq_key); 1783189756Sdavidxu } 1784161678Sdavidxu } 1785161678Sdavidxu 1786163697Sdavidxu umtxq_lock(&uq->uq_key); 1787163697Sdavidxu umtx_pi_unref(pi); 1788163697Sdavidxu umtxq_unlock(&uq->uq_key); 1789161678Sdavidxu 1790161678Sdavidxu umtx_key_release(&uq->uq_key); 1791161678Sdavidxu return (error); 1792161678Sdavidxu} 1793161678Sdavidxu 1794161678Sdavidxu/* 1795161678Sdavidxu * Unlock a PI mutex. 1796161678Sdavidxu */ 1797161678Sdavidxustatic int 1798161678Sdavidxudo_unlock_pi(struct thread *td, struct umutex *m, uint32_t flags) 1799161678Sdavidxu{ 1800161678Sdavidxu struct umtx_key key; 1801161678Sdavidxu struct umtx_q *uq_first, *uq_first2, *uq_me; 1802161678Sdavidxu struct umtx_pi *pi, *pi2; 1803161678Sdavidxu uint32_t owner, old, id; 1804161678Sdavidxu int error; 1805161678Sdavidxu int count; 1806161678Sdavidxu int pri; 1807161678Sdavidxu 1808161678Sdavidxu id = td->td_tid; 1809161678Sdavidxu /* 1810161678Sdavidxu * Make sure we own this mtx. 1811161678Sdavidxu */ 1812163449Sdavidxu owner = fuword32(__DEVOLATILE(uint32_t *, &m->m_owner)); 1813161678Sdavidxu if (owner == -1) 1814161678Sdavidxu return (EFAULT); 1815161678Sdavidxu 1816161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 1817161678Sdavidxu return (EPERM); 1818161678Sdavidxu 1819161678Sdavidxu /* This should be done in userland */ 1820161678Sdavidxu if ((owner & UMUTEX_CONTESTED) == 0) { 1821161678Sdavidxu old = casuword32(&m->m_owner, owner, UMUTEX_UNOWNED); 1822161678Sdavidxu if (old == -1) 1823161678Sdavidxu return (EFAULT); 1824161678Sdavidxu if (old == owner) 1825161678Sdavidxu return (0); 1826161855Sdavidxu owner = old; 1827161678Sdavidxu } 1828161678Sdavidxu 1829161678Sdavidxu /* We should only ever be in here for contested locks */ 1830161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PI_UMUTEX, GET_SHARE(flags), 1831161678Sdavidxu &key)) != 0) 1832161678Sdavidxu return (error); 1833161678Sdavidxu 1834161678Sdavidxu umtxq_lock(&key); 1835161678Sdavidxu umtxq_busy(&key); 1836161678Sdavidxu count = umtxq_count_pi(&key, &uq_first); 1837161678Sdavidxu if (uq_first != NULL) { 1838189756Sdavidxu mtx_lock_spin(&umtx_lock); 1839161678Sdavidxu pi = uq_first->uq_pi_blocked; 1840189756Sdavidxu KASSERT(pi != NULL, ("pi == NULL?")); 1841161678Sdavidxu if (pi->pi_owner != curthread) { 1842189756Sdavidxu mtx_unlock_spin(&umtx_lock); 1843161678Sdavidxu umtxq_unbusy(&key); 1844161678Sdavidxu umtxq_unlock(&key); 1845189756Sdavidxu umtx_key_release(&key); 1846161678Sdavidxu /* userland messed the mutex */ 1847161678Sdavidxu return (EPERM); 1848161678Sdavidxu } 1849161678Sdavidxu uq_me = curthread->td_umtxq; 1850161678Sdavidxu pi->pi_owner = NULL; 1851161678Sdavidxu TAILQ_REMOVE(&uq_me->uq_pi_contested, pi, pi_link); 1852189756Sdavidxu /* get highest priority thread which is still sleeping. */ 1853161678Sdavidxu uq_first = TAILQ_FIRST(&pi->pi_blocked); 1854189756Sdavidxu while (uq_first != NULL && 1855189756Sdavidxu (uq_first->uq_flags & UQF_UMTXQ) == 0) { 1856189756Sdavidxu uq_first = TAILQ_NEXT(uq_first, uq_lockq); 1857189756Sdavidxu } 1858161678Sdavidxu pri = PRI_MAX; 1859161678Sdavidxu TAILQ_FOREACH(pi2, &uq_me->uq_pi_contested, pi_link) { 1860161678Sdavidxu uq_first2 = TAILQ_FIRST(&pi2->pi_blocked); 1861161678Sdavidxu if (uq_first2 != NULL) { 1862161678Sdavidxu if (pri > UPRI(uq_first2->uq_thread)) 1863161678Sdavidxu pri = UPRI(uq_first2->uq_thread); 1864161678Sdavidxu } 1865161678Sdavidxu } 1866170300Sjeff thread_lock(curthread); 1867216791Sdavidxu sched_lend_user_prio(curthread, pri); 1868170300Sjeff thread_unlock(curthread); 1869170300Sjeff mtx_unlock_spin(&umtx_lock); 1870189756Sdavidxu if (uq_first) 1871189756Sdavidxu umtxq_signal_thread(uq_first); 1872161678Sdavidxu } 1873161678Sdavidxu umtxq_unlock(&key); 1874161678Sdavidxu 1875161678Sdavidxu /* 1876161678Sdavidxu * When unlocking the umtx, it must be marked as unowned if 1877161678Sdavidxu * there is zero or one thread only waiting for it. 1878161678Sdavidxu * Otherwise, it must be marked as contested. 1879161678Sdavidxu */ 1880161678Sdavidxu old = casuword32(&m->m_owner, owner, 1881161678Sdavidxu count <= 1 ? UMUTEX_UNOWNED : UMUTEX_CONTESTED); 1882161678Sdavidxu 1883161678Sdavidxu umtxq_lock(&key); 1884161678Sdavidxu umtxq_unbusy(&key); 1885161678Sdavidxu umtxq_unlock(&key); 1886161678Sdavidxu umtx_key_release(&key); 1887161678Sdavidxu if (old == -1) 1888161678Sdavidxu return (EFAULT); 1889161678Sdavidxu if (old != owner) 1890161678Sdavidxu return (EINVAL); 1891161678Sdavidxu return (0); 1892161678Sdavidxu} 1893161678Sdavidxu 1894161678Sdavidxu/* 1895161678Sdavidxu * Lock a PP mutex. 1896161678Sdavidxu */ 1897161678Sdavidxustatic int 1898161678Sdavidxu_do_lock_pp(struct thread *td, struct umutex *m, uint32_t flags, int timo, 1899161678Sdavidxu int try) 1900161678Sdavidxu{ 1901161678Sdavidxu struct umtx_q *uq, *uq2; 1902161678Sdavidxu struct umtx_pi *pi; 1903161678Sdavidxu uint32_t ceiling; 1904161678Sdavidxu uint32_t owner, id; 1905161678Sdavidxu int error, pri, old_inherited_pri, su; 1906161678Sdavidxu 1907161678Sdavidxu id = td->td_tid; 1908161678Sdavidxu uq = td->td_umtxq; 1909161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PP_UMUTEX, GET_SHARE(flags), 1910161678Sdavidxu &uq->uq_key)) != 0) 1911161678Sdavidxu return (error); 1912164033Srwatson su = (priv_check(td, PRIV_SCHED_RTPRIO) == 0); 1913161678Sdavidxu for (;;) { 1914161678Sdavidxu old_inherited_pri = uq->uq_inherited_pri; 1915161678Sdavidxu umtxq_lock(&uq->uq_key); 1916161678Sdavidxu umtxq_busy(&uq->uq_key); 1917161678Sdavidxu umtxq_unlock(&uq->uq_key); 1918161678Sdavidxu 1919161678Sdavidxu ceiling = RTP_PRIO_MAX - fuword32(&m->m_ceilings[0]); 1920161678Sdavidxu if (ceiling > RTP_PRIO_MAX) { 1921161678Sdavidxu error = EINVAL; 1922161678Sdavidxu goto out; 1923161678Sdavidxu } 1924161678Sdavidxu 1925170300Sjeff mtx_lock_spin(&umtx_lock); 1926161678Sdavidxu if (UPRI(td) < PRI_MIN_REALTIME + ceiling) { 1927170300Sjeff mtx_unlock_spin(&umtx_lock); 1928161678Sdavidxu error = EINVAL; 1929161678Sdavidxu goto out; 1930161678Sdavidxu } 1931161678Sdavidxu if (su && PRI_MIN_REALTIME + ceiling < uq->uq_inherited_pri) { 1932161678Sdavidxu uq->uq_inherited_pri = PRI_MIN_REALTIME + ceiling; 1933170300Sjeff thread_lock(td); 1934161678Sdavidxu if (uq->uq_inherited_pri < UPRI(td)) 1935161678Sdavidxu sched_lend_user_prio(td, uq->uq_inherited_pri); 1936170300Sjeff thread_unlock(td); 1937161678Sdavidxu } 1938170300Sjeff mtx_unlock_spin(&umtx_lock); 1939161678Sdavidxu 1940161678Sdavidxu owner = casuword32(&m->m_owner, 1941161678Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 1942161678Sdavidxu 1943161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 1944161678Sdavidxu error = 0; 1945161678Sdavidxu break; 1946161678Sdavidxu } 1947161678Sdavidxu 1948161678Sdavidxu /* The address was invalid. */ 1949161678Sdavidxu if (owner == -1) { 1950161678Sdavidxu error = EFAULT; 1951161678Sdavidxu break; 1952161678Sdavidxu } 1953161678Sdavidxu 1954161678Sdavidxu if ((flags & UMUTEX_ERROR_CHECK) != 0 && 1955161678Sdavidxu (owner & ~UMUTEX_CONTESTED) == id) { 1956161678Sdavidxu error = EDEADLK; 1957161678Sdavidxu break; 1958161678Sdavidxu } 1959161678Sdavidxu 1960161678Sdavidxu if (try != 0) { 1961161678Sdavidxu error = EBUSY; 1962161678Sdavidxu break; 1963161678Sdavidxu } 1964161678Sdavidxu 1965161678Sdavidxu /* 1966161678Sdavidxu * If we caught a signal, we have retried and now 1967161678Sdavidxu * exit immediately. 1968161678Sdavidxu */ 1969161678Sdavidxu if (error != 0) 1970161678Sdavidxu break; 1971161678Sdavidxu 1972161678Sdavidxu umtxq_lock(&uq->uq_key); 1973161678Sdavidxu umtxq_insert(uq); 1974161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1975161678Sdavidxu error = umtxq_sleep(uq, "umtxpp", timo); 1976161678Sdavidxu umtxq_remove(uq); 1977161678Sdavidxu umtxq_unlock(&uq->uq_key); 1978161678Sdavidxu 1979170300Sjeff mtx_lock_spin(&umtx_lock); 1980161678Sdavidxu uq->uq_inherited_pri = old_inherited_pri; 1981161678Sdavidxu pri = PRI_MAX; 1982161678Sdavidxu TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) { 1983161678Sdavidxu uq2 = TAILQ_FIRST(&pi->pi_blocked); 1984161678Sdavidxu if (uq2 != NULL) { 1985161678Sdavidxu if (pri > UPRI(uq2->uq_thread)) 1986161678Sdavidxu pri = UPRI(uq2->uq_thread); 1987161678Sdavidxu } 1988161678Sdavidxu } 1989161678Sdavidxu if (pri > uq->uq_inherited_pri) 1990161678Sdavidxu pri = uq->uq_inherited_pri; 1991170300Sjeff thread_lock(td); 1992216791Sdavidxu sched_lend_user_prio(td, pri); 1993170300Sjeff thread_unlock(td); 1994170300Sjeff mtx_unlock_spin(&umtx_lock); 1995161678Sdavidxu } 1996161678Sdavidxu 1997161678Sdavidxu if (error != 0) { 1998170300Sjeff mtx_lock_spin(&umtx_lock); 1999161678Sdavidxu uq->uq_inherited_pri = old_inherited_pri; 2000161678Sdavidxu pri = PRI_MAX; 2001161678Sdavidxu TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) { 2002161678Sdavidxu uq2 = TAILQ_FIRST(&pi->pi_blocked); 2003161678Sdavidxu if (uq2 != NULL) { 2004161678Sdavidxu if (pri > UPRI(uq2->uq_thread)) 2005161678Sdavidxu pri = UPRI(uq2->uq_thread); 2006161678Sdavidxu } 2007161678Sdavidxu } 2008161678Sdavidxu if (pri > uq->uq_inherited_pri) 2009161678Sdavidxu pri = uq->uq_inherited_pri; 2010170300Sjeff thread_lock(td); 2011216791Sdavidxu sched_lend_user_prio(td, pri); 2012170300Sjeff thread_unlock(td); 2013170300Sjeff mtx_unlock_spin(&umtx_lock); 2014161678Sdavidxu } 2015161678Sdavidxu 2016161678Sdavidxuout: 2017161678Sdavidxu umtxq_lock(&uq->uq_key); 2018161678Sdavidxu umtxq_unbusy(&uq->uq_key); 2019161678Sdavidxu umtxq_unlock(&uq->uq_key); 2020161678Sdavidxu umtx_key_release(&uq->uq_key); 2021161678Sdavidxu return (error); 2022161678Sdavidxu} 2023161678Sdavidxu 2024161678Sdavidxu/* 2025161678Sdavidxu * Unlock a PP mutex. 2026161678Sdavidxu */ 2027161678Sdavidxustatic int 2028161678Sdavidxudo_unlock_pp(struct thread *td, struct umutex *m, uint32_t flags) 2029161678Sdavidxu{ 2030161678Sdavidxu struct umtx_key key; 2031161678Sdavidxu struct umtx_q *uq, *uq2; 2032161678Sdavidxu struct umtx_pi *pi; 2033161678Sdavidxu uint32_t owner, id; 2034161678Sdavidxu uint32_t rceiling; 2035161926Sdavidxu int error, pri, new_inherited_pri, su; 2036161678Sdavidxu 2037161678Sdavidxu id = td->td_tid; 2038161678Sdavidxu uq = td->td_umtxq; 2039164033Srwatson su = (priv_check(td, PRIV_SCHED_RTPRIO) == 0); 2040161678Sdavidxu 2041161678Sdavidxu /* 2042161678Sdavidxu * Make sure we own this mtx. 2043161678Sdavidxu */ 2044163449Sdavidxu owner = fuword32(__DEVOLATILE(uint32_t *, &m->m_owner)); 2045161678Sdavidxu if (owner == -1) 2046161678Sdavidxu return (EFAULT); 2047161678Sdavidxu 2048161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 2049161678Sdavidxu return (EPERM); 2050161678Sdavidxu 2051161678Sdavidxu error = copyin(&m->m_ceilings[1], &rceiling, sizeof(uint32_t)); 2052161678Sdavidxu if (error != 0) 2053161678Sdavidxu return (error); 2054161678Sdavidxu 2055161678Sdavidxu if (rceiling == -1) 2056161678Sdavidxu new_inherited_pri = PRI_MAX; 2057161678Sdavidxu else { 2058161678Sdavidxu rceiling = RTP_PRIO_MAX - rceiling; 2059161678Sdavidxu if (rceiling > RTP_PRIO_MAX) 2060161678Sdavidxu return (EINVAL); 2061161678Sdavidxu new_inherited_pri = PRI_MIN_REALTIME + rceiling; 2062161678Sdavidxu } 2063161678Sdavidxu 2064161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PP_UMUTEX, GET_SHARE(flags), 2065161678Sdavidxu &key)) != 0) 2066161678Sdavidxu return (error); 2067161678Sdavidxu umtxq_lock(&key); 2068161678Sdavidxu umtxq_busy(&key); 2069161678Sdavidxu umtxq_unlock(&key); 2070161678Sdavidxu /* 2071161678Sdavidxu * For priority protected mutex, always set unlocked state 2072161678Sdavidxu * to UMUTEX_CONTESTED, so that userland always enters kernel 2073161678Sdavidxu * to lock the mutex, it is necessary because thread priority 2074161678Sdavidxu * has to be adjusted for such mutex. 2075161678Sdavidxu */ 2076163449Sdavidxu error = suword32(__DEVOLATILE(uint32_t *, &m->m_owner), 2077163449Sdavidxu UMUTEX_CONTESTED); 2078161678Sdavidxu 2079161678Sdavidxu umtxq_lock(&key); 2080161678Sdavidxu if (error == 0) 2081161678Sdavidxu umtxq_signal(&key, 1); 2082161678Sdavidxu umtxq_unbusy(&key); 2083161678Sdavidxu umtxq_unlock(&key); 2084161678Sdavidxu 2085161678Sdavidxu if (error == -1) 2086161678Sdavidxu error = EFAULT; 2087161678Sdavidxu else { 2088170300Sjeff mtx_lock_spin(&umtx_lock); 2089161926Sdavidxu if (su != 0) 2090161926Sdavidxu uq->uq_inherited_pri = new_inherited_pri; 2091161678Sdavidxu pri = PRI_MAX; 2092161678Sdavidxu TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) { 2093161678Sdavidxu uq2 = TAILQ_FIRST(&pi->pi_blocked); 2094161678Sdavidxu if (uq2 != NULL) { 2095161678Sdavidxu if (pri > UPRI(uq2->uq_thread)) 2096161678Sdavidxu pri = UPRI(uq2->uq_thread); 2097161678Sdavidxu } 2098161678Sdavidxu } 2099161678Sdavidxu if (pri > uq->uq_inherited_pri) 2100161678Sdavidxu pri = uq->uq_inherited_pri; 2101170300Sjeff thread_lock(td); 2102216791Sdavidxu sched_lend_user_prio(td, pri); 2103170300Sjeff thread_unlock(td); 2104170300Sjeff mtx_unlock_spin(&umtx_lock); 2105161678Sdavidxu } 2106161678Sdavidxu umtx_key_release(&key); 2107161678Sdavidxu return (error); 2108161678Sdavidxu} 2109161678Sdavidxu 2110161678Sdavidxustatic int 2111161678Sdavidxudo_set_ceiling(struct thread *td, struct umutex *m, uint32_t ceiling, 2112161678Sdavidxu uint32_t *old_ceiling) 2113161678Sdavidxu{ 2114161678Sdavidxu struct umtx_q *uq; 2115161678Sdavidxu uint32_t save_ceiling; 2116161678Sdavidxu uint32_t owner, id; 2117161678Sdavidxu uint32_t flags; 2118161678Sdavidxu int error; 2119161678Sdavidxu 2120161678Sdavidxu flags = fuword32(&m->m_flags); 2121161678Sdavidxu if ((flags & UMUTEX_PRIO_PROTECT) == 0) 2122161678Sdavidxu return (EINVAL); 2123161678Sdavidxu if (ceiling > RTP_PRIO_MAX) 2124161678Sdavidxu return (EINVAL); 2125161678Sdavidxu id = td->td_tid; 2126161678Sdavidxu uq = td->td_umtxq; 2127161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PP_UMUTEX, GET_SHARE(flags), 2128161678Sdavidxu &uq->uq_key)) != 0) 2129161678Sdavidxu return (error); 2130161678Sdavidxu for (;;) { 2131161678Sdavidxu umtxq_lock(&uq->uq_key); 2132161678Sdavidxu umtxq_busy(&uq->uq_key); 2133161678Sdavidxu umtxq_unlock(&uq->uq_key); 2134161678Sdavidxu 2135161678Sdavidxu save_ceiling = fuword32(&m->m_ceilings[0]); 2136161678Sdavidxu 2137161678Sdavidxu owner = casuword32(&m->m_owner, 2138161678Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 2139161678Sdavidxu 2140161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 2141161678Sdavidxu suword32(&m->m_ceilings[0], ceiling); 2142163449Sdavidxu suword32(__DEVOLATILE(uint32_t *, &m->m_owner), 2143163449Sdavidxu UMUTEX_CONTESTED); 2144161678Sdavidxu error = 0; 2145161678Sdavidxu break; 2146161678Sdavidxu } 2147161678Sdavidxu 2148161678Sdavidxu /* The address was invalid. */ 2149161678Sdavidxu if (owner == -1) { 2150161678Sdavidxu error = EFAULT; 2151161678Sdavidxu break; 2152161678Sdavidxu } 2153161678Sdavidxu 2154161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) == id) { 2155161678Sdavidxu suword32(&m->m_ceilings[0], ceiling); 2156161678Sdavidxu error = 0; 2157161678Sdavidxu break; 2158161678Sdavidxu } 2159161678Sdavidxu 2160161678Sdavidxu /* 2161161678Sdavidxu * If we caught a signal, we have retried and now 2162161678Sdavidxu * exit immediately. 2163161678Sdavidxu */ 2164161678Sdavidxu if (error != 0) 2165161678Sdavidxu break; 2166161678Sdavidxu 2167161678Sdavidxu /* 2168161678Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 2169161678Sdavidxu * and we need to retry or we lost a race to the thread 2170161678Sdavidxu * unlocking the umtx. 2171161678Sdavidxu */ 2172161678Sdavidxu umtxq_lock(&uq->uq_key); 2173161678Sdavidxu umtxq_insert(uq); 2174161678Sdavidxu umtxq_unbusy(&uq->uq_key); 2175161678Sdavidxu error = umtxq_sleep(uq, "umtxpp", 0); 2176161678Sdavidxu umtxq_remove(uq); 2177161678Sdavidxu umtxq_unlock(&uq->uq_key); 2178161678Sdavidxu } 2179161678Sdavidxu umtxq_lock(&uq->uq_key); 2180161678Sdavidxu if (error == 0) 2181161678Sdavidxu umtxq_signal(&uq->uq_key, INT_MAX); 2182161678Sdavidxu umtxq_unbusy(&uq->uq_key); 2183161678Sdavidxu umtxq_unlock(&uq->uq_key); 2184161678Sdavidxu umtx_key_release(&uq->uq_key); 2185161678Sdavidxu if (error == 0 && old_ceiling != NULL) 2186161678Sdavidxu suword32(old_ceiling, save_ceiling); 2187161678Sdavidxu return (error); 2188161678Sdavidxu} 2189161678Sdavidxu 2190162030Sdavidxustatic int 2191162030Sdavidxu_do_lock_umutex(struct thread *td, struct umutex *m, int flags, int timo, 2192179970Sdavidxu int mode) 2193162030Sdavidxu{ 2194162030Sdavidxu switch(flags & (UMUTEX_PRIO_INHERIT | UMUTEX_PRIO_PROTECT)) { 2195162030Sdavidxu case 0: 2196179970Sdavidxu return (_do_lock_normal(td, m, flags, timo, mode)); 2197162030Sdavidxu case UMUTEX_PRIO_INHERIT: 2198179970Sdavidxu return (_do_lock_pi(td, m, flags, timo, mode)); 2199162030Sdavidxu case UMUTEX_PRIO_PROTECT: 2200179970Sdavidxu return (_do_lock_pp(td, m, flags, timo, mode)); 2201162030Sdavidxu } 2202162030Sdavidxu return (EINVAL); 2203162030Sdavidxu} 2204162030Sdavidxu 2205161678Sdavidxu/* 2206161678Sdavidxu * Lock a userland POSIX mutex. 2207161678Sdavidxu */ 2208161678Sdavidxustatic int 2209162030Sdavidxudo_lock_umutex(struct thread *td, struct umutex *m, 2210179970Sdavidxu struct timespec *timeout, int mode) 2211161678Sdavidxu{ 2212162030Sdavidxu struct timespec ts, ts2, ts3; 2213162030Sdavidxu struct timeval tv; 2214161678Sdavidxu uint32_t flags; 2215162030Sdavidxu int error; 2216161678Sdavidxu 2217161678Sdavidxu flags = fuword32(&m->m_flags); 2218161678Sdavidxu if (flags == -1) 2219161678Sdavidxu return (EFAULT); 2220161678Sdavidxu 2221162030Sdavidxu if (timeout == NULL) { 2222179970Sdavidxu error = _do_lock_umutex(td, m, flags, 0, mode); 2223162030Sdavidxu /* Mutex locking is restarted if it is interrupted. */ 2224179970Sdavidxu if (error == EINTR && mode != _UMUTEX_WAIT) 2225162030Sdavidxu error = ERESTART; 2226162030Sdavidxu } else { 2227162030Sdavidxu getnanouptime(&ts); 2228162030Sdavidxu timespecadd(&ts, timeout); 2229162030Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 2230162030Sdavidxu for (;;) { 2231179970Sdavidxu error = _do_lock_umutex(td, m, flags, tvtohz(&tv), mode); 2232162030Sdavidxu if (error != ETIMEDOUT) 2233162030Sdavidxu break; 2234162030Sdavidxu getnanouptime(&ts2); 2235162030Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 2236162030Sdavidxu error = ETIMEDOUT; 2237162030Sdavidxu break; 2238162030Sdavidxu } 2239162030Sdavidxu ts3 = ts; 2240162030Sdavidxu timespecsub(&ts3, &ts2); 2241162030Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 2242162030Sdavidxu } 2243162030Sdavidxu /* Timed-locking is not restarted. */ 2244162030Sdavidxu if (error == ERESTART) 2245162030Sdavidxu error = EINTR; 2246161742Sdavidxu } 2247162030Sdavidxu return (error); 2248161678Sdavidxu} 2249161678Sdavidxu 2250161678Sdavidxu/* 2251161678Sdavidxu * Unlock a userland POSIX mutex. 2252161678Sdavidxu */ 2253161678Sdavidxustatic int 2254161678Sdavidxudo_unlock_umutex(struct thread *td, struct umutex *m) 2255161678Sdavidxu{ 2256161678Sdavidxu uint32_t flags; 2257161678Sdavidxu 2258161678Sdavidxu flags = fuword32(&m->m_flags); 2259161678Sdavidxu if (flags == -1) 2260161678Sdavidxu return (EFAULT); 2261161678Sdavidxu 2262161855Sdavidxu switch(flags & (UMUTEX_PRIO_INHERIT | UMUTEX_PRIO_PROTECT)) { 2263161855Sdavidxu case 0: 2264161855Sdavidxu return (do_unlock_normal(td, m, flags)); 2265161855Sdavidxu case UMUTEX_PRIO_INHERIT: 2266161855Sdavidxu return (do_unlock_pi(td, m, flags)); 2267161855Sdavidxu case UMUTEX_PRIO_PROTECT: 2268161855Sdavidxu return (do_unlock_pp(td, m, flags)); 2269161855Sdavidxu } 2270161678Sdavidxu 2271161855Sdavidxu return (EINVAL); 2272161678Sdavidxu} 2273161678Sdavidxu 2274164839Sdavidxustatic int 2275164839Sdavidxudo_cv_wait(struct thread *td, struct ucond *cv, struct umutex *m, 2276164876Sdavidxu struct timespec *timeout, u_long wflags) 2277164839Sdavidxu{ 2278164839Sdavidxu struct umtx_q *uq; 2279164839Sdavidxu struct timeval tv; 2280164839Sdavidxu struct timespec cts, ets, tts; 2281164839Sdavidxu uint32_t flags; 2282216641Sdavidxu uint32_t clockid; 2283164839Sdavidxu int error; 2284164839Sdavidxu 2285164839Sdavidxu uq = td->td_umtxq; 2286164839Sdavidxu flags = fuword32(&cv->c_flags); 2287164839Sdavidxu error = umtx_key_get(cv, TYPE_CV, GET_SHARE(flags), &uq->uq_key); 2288164839Sdavidxu if (error != 0) 2289164839Sdavidxu return (error); 2290216641Sdavidxu 2291216641Sdavidxu if ((wflags & CVWAIT_CLOCKID) != 0) { 2292216641Sdavidxu clockid = fuword32(&cv->c_clockid); 2293216641Sdavidxu if (clockid < CLOCK_REALTIME || 2294216641Sdavidxu clockid >= CLOCK_THREAD_CPUTIME_ID) { 2295216641Sdavidxu /* hmm, only HW clock id will work. */ 2296216641Sdavidxu return (EINVAL); 2297216641Sdavidxu } 2298216641Sdavidxu } else { 2299216641Sdavidxu clockid = CLOCK_REALTIME; 2300216641Sdavidxu } 2301216641Sdavidxu 2302164839Sdavidxu umtxq_lock(&uq->uq_key); 2303164839Sdavidxu umtxq_busy(&uq->uq_key); 2304164839Sdavidxu umtxq_insert(uq); 2305164839Sdavidxu umtxq_unlock(&uq->uq_key); 2306164839Sdavidxu 2307164839Sdavidxu /* 2308216641Sdavidxu * Set c_has_waiters to 1 before releasing user mutex, also 2309216641Sdavidxu * don't modify cache line when unnecessary. 2310164839Sdavidxu */ 2311216641Sdavidxu if (fuword32(__DEVOLATILE(uint32_t *, &cv->c_has_waiters)) == 0) 2312216641Sdavidxu suword32(__DEVOLATILE(uint32_t *, &cv->c_has_waiters), 1); 2313164839Sdavidxu 2314164839Sdavidxu umtxq_lock(&uq->uq_key); 2315164839Sdavidxu umtxq_unbusy(&uq->uq_key); 2316164839Sdavidxu umtxq_unlock(&uq->uq_key); 2317164839Sdavidxu 2318164839Sdavidxu error = do_unlock_umutex(td, m); 2319164839Sdavidxu 2320164839Sdavidxu umtxq_lock(&uq->uq_key); 2321164839Sdavidxu if (error == 0) { 2322216641Sdavidxu if (timeout == NULL) { 2323164839Sdavidxu error = umtxq_sleep(uq, "ucond", 0); 2324164839Sdavidxu } else { 2325216641Sdavidxu if ((wflags & CVWAIT_ABSTIME) == 0) { 2326216641Sdavidxu kern_clock_gettime(td, clockid, &ets); 2327216641Sdavidxu timespecadd(&ets, timeout); 2328216641Sdavidxu tts = *timeout; 2329216641Sdavidxu } else { /* absolute time */ 2330216641Sdavidxu ets = *timeout; 2331216641Sdavidxu tts = *timeout; 2332216641Sdavidxu kern_clock_gettime(td, clockid, &cts); 2333216641Sdavidxu timespecsub(&tts, &cts); 2334216641Sdavidxu } 2335216641Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &tts); 2336164839Sdavidxu for (;;) { 2337164839Sdavidxu error = umtxq_sleep(uq, "ucond", tvtohz(&tv)); 2338164839Sdavidxu if (error != ETIMEDOUT) 2339164839Sdavidxu break; 2340216641Sdavidxu kern_clock_gettime(td, clockid, &cts); 2341164839Sdavidxu if (timespeccmp(&cts, &ets, >=)) { 2342164839Sdavidxu error = ETIMEDOUT; 2343164839Sdavidxu break; 2344164839Sdavidxu } 2345164839Sdavidxu tts = ets; 2346164839Sdavidxu timespecsub(&tts, &cts); 2347164839Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &tts); 2348164839Sdavidxu } 2349164839Sdavidxu } 2350164839Sdavidxu } 2351164839Sdavidxu 2352211794Sdavidxu if ((uq->uq_flags & UQF_UMTXQ) == 0) 2353211794Sdavidxu error = 0; 2354211794Sdavidxu else { 2355216641Sdavidxu /* 2356216641Sdavidxu * This must be timeout,interrupted by signal or 2357216641Sdavidxu * surprious wakeup, clear c_has_waiter flag when 2358216641Sdavidxu * necessary. 2359216641Sdavidxu */ 2360216641Sdavidxu umtxq_busy(&uq->uq_key); 2361216641Sdavidxu if ((uq->uq_flags & UQF_UMTXQ) != 0) { 2362216641Sdavidxu int oldlen = uq->uq_cur_queue->length; 2363216641Sdavidxu umtxq_remove(uq); 2364216641Sdavidxu if (oldlen == 1) { 2365216641Sdavidxu umtxq_unlock(&uq->uq_key); 2366216641Sdavidxu suword32( 2367216641Sdavidxu __DEVOLATILE(uint32_t *, 2368216641Sdavidxu &cv->c_has_waiters), 0); 2369216641Sdavidxu umtxq_lock(&uq->uq_key); 2370216641Sdavidxu } 2371216641Sdavidxu } 2372216641Sdavidxu umtxq_unbusy(&uq->uq_key); 2373164839Sdavidxu if (error == ERESTART) 2374164839Sdavidxu error = EINTR; 2375164839Sdavidxu } 2376211794Sdavidxu 2377164839Sdavidxu umtxq_unlock(&uq->uq_key); 2378164839Sdavidxu umtx_key_release(&uq->uq_key); 2379164839Sdavidxu return (error); 2380164839Sdavidxu} 2381164839Sdavidxu 2382164839Sdavidxu/* 2383164839Sdavidxu * Signal a userland condition variable. 2384164839Sdavidxu */ 2385164839Sdavidxustatic int 2386164839Sdavidxudo_cv_signal(struct thread *td, struct ucond *cv) 2387164839Sdavidxu{ 2388164839Sdavidxu struct umtx_key key; 2389164839Sdavidxu int error, cnt, nwake; 2390164839Sdavidxu uint32_t flags; 2391164839Sdavidxu 2392164839Sdavidxu flags = fuword32(&cv->c_flags); 2393164839Sdavidxu if ((error = umtx_key_get(cv, TYPE_CV, GET_SHARE(flags), &key)) != 0) 2394164839Sdavidxu return (error); 2395164839Sdavidxu umtxq_lock(&key); 2396164839Sdavidxu umtxq_busy(&key); 2397164839Sdavidxu cnt = umtxq_count(&key); 2398164839Sdavidxu nwake = umtxq_signal(&key, 1); 2399164839Sdavidxu if (cnt <= nwake) { 2400164839Sdavidxu umtxq_unlock(&key); 2401164839Sdavidxu error = suword32( 2402164839Sdavidxu __DEVOLATILE(uint32_t *, &cv->c_has_waiters), 0); 2403164839Sdavidxu umtxq_lock(&key); 2404164839Sdavidxu } 2405164839Sdavidxu umtxq_unbusy(&key); 2406164839Sdavidxu umtxq_unlock(&key); 2407164839Sdavidxu umtx_key_release(&key); 2408164839Sdavidxu return (error); 2409164839Sdavidxu} 2410164839Sdavidxu 2411164839Sdavidxustatic int 2412164839Sdavidxudo_cv_broadcast(struct thread *td, struct ucond *cv) 2413164839Sdavidxu{ 2414164839Sdavidxu struct umtx_key key; 2415164839Sdavidxu int error; 2416164839Sdavidxu uint32_t flags; 2417164839Sdavidxu 2418164839Sdavidxu flags = fuword32(&cv->c_flags); 2419164839Sdavidxu if ((error = umtx_key_get(cv, TYPE_CV, GET_SHARE(flags), &key)) != 0) 2420164839Sdavidxu return (error); 2421164839Sdavidxu 2422164839Sdavidxu umtxq_lock(&key); 2423164839Sdavidxu umtxq_busy(&key); 2424164839Sdavidxu umtxq_signal(&key, INT_MAX); 2425164839Sdavidxu umtxq_unlock(&key); 2426164839Sdavidxu 2427164839Sdavidxu error = suword32(__DEVOLATILE(uint32_t *, &cv->c_has_waiters), 0); 2428164839Sdavidxu 2429164839Sdavidxu umtxq_lock(&key); 2430164839Sdavidxu umtxq_unbusy(&key); 2431164839Sdavidxu umtxq_unlock(&key); 2432164839Sdavidxu 2433164839Sdavidxu umtx_key_release(&key); 2434164839Sdavidxu return (error); 2435164839Sdavidxu} 2436164839Sdavidxu 2437177848Sdavidxustatic int 2438177848Sdavidxudo_rw_rdlock(struct thread *td, struct urwlock *rwlock, long fflag, int timo) 2439177848Sdavidxu{ 2440177848Sdavidxu struct umtx_q *uq; 2441177848Sdavidxu uint32_t flags, wrflags; 2442177848Sdavidxu int32_t state, oldstate; 2443177848Sdavidxu int32_t blocked_readers; 2444177848Sdavidxu int error; 2445177848Sdavidxu 2446177848Sdavidxu uq = td->td_umtxq; 2447177848Sdavidxu flags = fuword32(&rwlock->rw_flags); 2448177848Sdavidxu error = umtx_key_get(rwlock, TYPE_RWLOCK, GET_SHARE(flags), &uq->uq_key); 2449177848Sdavidxu if (error != 0) 2450177848Sdavidxu return (error); 2451177848Sdavidxu 2452177848Sdavidxu wrflags = URWLOCK_WRITE_OWNER; 2453177848Sdavidxu if (!(fflag & URWLOCK_PREFER_READER) && !(flags & URWLOCK_PREFER_READER)) 2454177848Sdavidxu wrflags |= URWLOCK_WRITE_WAITERS; 2455177848Sdavidxu 2456177848Sdavidxu for (;;) { 2457177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2458177848Sdavidxu /* try to lock it */ 2459177848Sdavidxu while (!(state & wrflags)) { 2460177848Sdavidxu if (__predict_false(URWLOCK_READER_COUNT(state) == URWLOCK_MAX_READERS)) { 2461177848Sdavidxu umtx_key_release(&uq->uq_key); 2462177848Sdavidxu return (EAGAIN); 2463177848Sdavidxu } 2464177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, state + 1); 2465177848Sdavidxu if (oldstate == state) { 2466177848Sdavidxu umtx_key_release(&uq->uq_key); 2467177848Sdavidxu return (0); 2468177848Sdavidxu } 2469177848Sdavidxu state = oldstate; 2470177848Sdavidxu } 2471177848Sdavidxu 2472177848Sdavidxu if (error) 2473177848Sdavidxu break; 2474177848Sdavidxu 2475177848Sdavidxu /* grab monitor lock */ 2476177848Sdavidxu umtxq_lock(&uq->uq_key); 2477177848Sdavidxu umtxq_busy(&uq->uq_key); 2478177848Sdavidxu umtxq_unlock(&uq->uq_key); 2479177848Sdavidxu 2480203414Sdavidxu /* 2481203414Sdavidxu * re-read the state, in case it changed between the try-lock above 2482203414Sdavidxu * and the check below 2483203414Sdavidxu */ 2484203414Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2485203414Sdavidxu 2486177848Sdavidxu /* set read contention bit */ 2487177848Sdavidxu while ((state & wrflags) && !(state & URWLOCK_READ_WAITERS)) { 2488177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, state | URWLOCK_READ_WAITERS); 2489177848Sdavidxu if (oldstate == state) 2490177848Sdavidxu goto sleep; 2491177848Sdavidxu state = oldstate; 2492177848Sdavidxu } 2493177848Sdavidxu 2494177848Sdavidxu /* state is changed while setting flags, restart */ 2495177848Sdavidxu if (!(state & wrflags)) { 2496177848Sdavidxu umtxq_lock(&uq->uq_key); 2497177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2498177848Sdavidxu umtxq_unlock(&uq->uq_key); 2499177848Sdavidxu continue; 2500177848Sdavidxu } 2501177848Sdavidxu 2502177848Sdavidxusleep: 2503177848Sdavidxu /* contention bit is set, before sleeping, increase read waiter count */ 2504177848Sdavidxu blocked_readers = fuword32(&rwlock->rw_blocked_readers); 2505177848Sdavidxu suword32(&rwlock->rw_blocked_readers, blocked_readers+1); 2506177848Sdavidxu 2507177848Sdavidxu while (state & wrflags) { 2508177848Sdavidxu umtxq_lock(&uq->uq_key); 2509177848Sdavidxu umtxq_insert(uq); 2510177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2511177848Sdavidxu 2512177848Sdavidxu error = umtxq_sleep(uq, "urdlck", timo); 2513177848Sdavidxu 2514177848Sdavidxu umtxq_busy(&uq->uq_key); 2515177848Sdavidxu umtxq_remove(uq); 2516177848Sdavidxu umtxq_unlock(&uq->uq_key); 2517177848Sdavidxu if (error) 2518177848Sdavidxu break; 2519177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2520177848Sdavidxu } 2521177848Sdavidxu 2522177848Sdavidxu /* decrease read waiter count, and may clear read contention bit */ 2523177848Sdavidxu blocked_readers = fuword32(&rwlock->rw_blocked_readers); 2524177848Sdavidxu suword32(&rwlock->rw_blocked_readers, blocked_readers-1); 2525177848Sdavidxu if (blocked_readers == 1) { 2526177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2527177848Sdavidxu for (;;) { 2528177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, 2529177848Sdavidxu state & ~URWLOCK_READ_WAITERS); 2530177848Sdavidxu if (oldstate == state) 2531177848Sdavidxu break; 2532177848Sdavidxu state = oldstate; 2533177848Sdavidxu } 2534177848Sdavidxu } 2535177848Sdavidxu 2536177848Sdavidxu umtxq_lock(&uq->uq_key); 2537177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2538177848Sdavidxu umtxq_unlock(&uq->uq_key); 2539177848Sdavidxu } 2540177848Sdavidxu umtx_key_release(&uq->uq_key); 2541177848Sdavidxu return (error); 2542177848Sdavidxu} 2543177848Sdavidxu 2544177848Sdavidxustatic int 2545177848Sdavidxudo_rw_rdlock2(struct thread *td, void *obj, long val, struct timespec *timeout) 2546177848Sdavidxu{ 2547177848Sdavidxu struct timespec ts, ts2, ts3; 2548177848Sdavidxu struct timeval tv; 2549177848Sdavidxu int error; 2550177848Sdavidxu 2551177848Sdavidxu getnanouptime(&ts); 2552177848Sdavidxu timespecadd(&ts, timeout); 2553177848Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 2554177848Sdavidxu for (;;) { 2555177848Sdavidxu error = do_rw_rdlock(td, obj, val, tvtohz(&tv)); 2556177848Sdavidxu if (error != ETIMEDOUT) 2557177848Sdavidxu break; 2558177848Sdavidxu getnanouptime(&ts2); 2559177848Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 2560177848Sdavidxu error = ETIMEDOUT; 2561177848Sdavidxu break; 2562177848Sdavidxu } 2563177848Sdavidxu ts3 = ts; 2564177848Sdavidxu timespecsub(&ts3, &ts2); 2565177848Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 2566177848Sdavidxu } 2567177849Sdavidxu if (error == ERESTART) 2568177849Sdavidxu error = EINTR; 2569177848Sdavidxu return (error); 2570177848Sdavidxu} 2571177848Sdavidxu 2572177848Sdavidxustatic int 2573177848Sdavidxudo_rw_wrlock(struct thread *td, struct urwlock *rwlock, int timo) 2574177848Sdavidxu{ 2575177848Sdavidxu struct umtx_q *uq; 2576177848Sdavidxu uint32_t flags; 2577177848Sdavidxu int32_t state, oldstate; 2578177848Sdavidxu int32_t blocked_writers; 2579197476Sdavidxu int32_t blocked_readers; 2580177848Sdavidxu int error; 2581177848Sdavidxu 2582177848Sdavidxu uq = td->td_umtxq; 2583177848Sdavidxu flags = fuword32(&rwlock->rw_flags); 2584177848Sdavidxu error = umtx_key_get(rwlock, TYPE_RWLOCK, GET_SHARE(flags), &uq->uq_key); 2585177848Sdavidxu if (error != 0) 2586177848Sdavidxu return (error); 2587177848Sdavidxu 2588197476Sdavidxu blocked_readers = 0; 2589177848Sdavidxu for (;;) { 2590177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2591177848Sdavidxu while (!(state & URWLOCK_WRITE_OWNER) && URWLOCK_READER_COUNT(state) == 0) { 2592177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, state | URWLOCK_WRITE_OWNER); 2593177848Sdavidxu if (oldstate == state) { 2594177848Sdavidxu umtx_key_release(&uq->uq_key); 2595177848Sdavidxu return (0); 2596177848Sdavidxu } 2597177848Sdavidxu state = oldstate; 2598177848Sdavidxu } 2599177848Sdavidxu 2600197476Sdavidxu if (error) { 2601197476Sdavidxu if (!(state & (URWLOCK_WRITE_OWNER|URWLOCK_WRITE_WAITERS)) && 2602197476Sdavidxu blocked_readers != 0) { 2603197476Sdavidxu umtxq_lock(&uq->uq_key); 2604197476Sdavidxu umtxq_busy(&uq->uq_key); 2605197476Sdavidxu umtxq_signal_queue(&uq->uq_key, INT_MAX, UMTX_SHARED_QUEUE); 2606197476Sdavidxu umtxq_unbusy(&uq->uq_key); 2607197476Sdavidxu umtxq_unlock(&uq->uq_key); 2608197476Sdavidxu } 2609197476Sdavidxu 2610177848Sdavidxu break; 2611197476Sdavidxu } 2612177848Sdavidxu 2613177848Sdavidxu /* grab monitor lock */ 2614177848Sdavidxu umtxq_lock(&uq->uq_key); 2615177848Sdavidxu umtxq_busy(&uq->uq_key); 2616177848Sdavidxu umtxq_unlock(&uq->uq_key); 2617177848Sdavidxu 2618203414Sdavidxu /* 2619203414Sdavidxu * re-read the state, in case it changed between the try-lock above 2620203414Sdavidxu * and the check below 2621203414Sdavidxu */ 2622203414Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2623203414Sdavidxu 2624177848Sdavidxu while (((state & URWLOCK_WRITE_OWNER) || URWLOCK_READER_COUNT(state) != 0) && 2625177848Sdavidxu (state & URWLOCK_WRITE_WAITERS) == 0) { 2626177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, state | URWLOCK_WRITE_WAITERS); 2627177848Sdavidxu if (oldstate == state) 2628177848Sdavidxu goto sleep; 2629177848Sdavidxu state = oldstate; 2630177848Sdavidxu } 2631177848Sdavidxu 2632177848Sdavidxu if (!(state & URWLOCK_WRITE_OWNER) && URWLOCK_READER_COUNT(state) == 0) { 2633177848Sdavidxu umtxq_lock(&uq->uq_key); 2634177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2635177848Sdavidxu umtxq_unlock(&uq->uq_key); 2636177848Sdavidxu continue; 2637177848Sdavidxu } 2638177848Sdavidxusleep: 2639177848Sdavidxu blocked_writers = fuword32(&rwlock->rw_blocked_writers); 2640177848Sdavidxu suword32(&rwlock->rw_blocked_writers, blocked_writers+1); 2641177848Sdavidxu 2642177848Sdavidxu while ((state & URWLOCK_WRITE_OWNER) || URWLOCK_READER_COUNT(state) != 0) { 2643177848Sdavidxu umtxq_lock(&uq->uq_key); 2644177848Sdavidxu umtxq_insert_queue(uq, UMTX_EXCLUSIVE_QUEUE); 2645177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2646177848Sdavidxu 2647177848Sdavidxu error = umtxq_sleep(uq, "uwrlck", timo); 2648177848Sdavidxu 2649177848Sdavidxu umtxq_busy(&uq->uq_key); 2650177848Sdavidxu umtxq_remove_queue(uq, UMTX_EXCLUSIVE_QUEUE); 2651177848Sdavidxu umtxq_unlock(&uq->uq_key); 2652177848Sdavidxu if (error) 2653177848Sdavidxu break; 2654177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2655177848Sdavidxu } 2656177848Sdavidxu 2657177848Sdavidxu blocked_writers = fuword32(&rwlock->rw_blocked_writers); 2658177848Sdavidxu suword32(&rwlock->rw_blocked_writers, blocked_writers-1); 2659177848Sdavidxu if (blocked_writers == 1) { 2660177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2661177848Sdavidxu for (;;) { 2662177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, 2663177848Sdavidxu state & ~URWLOCK_WRITE_WAITERS); 2664177848Sdavidxu if (oldstate == state) 2665177848Sdavidxu break; 2666177848Sdavidxu state = oldstate; 2667177848Sdavidxu } 2668197476Sdavidxu blocked_readers = fuword32(&rwlock->rw_blocked_readers); 2669197476Sdavidxu } else 2670197476Sdavidxu blocked_readers = 0; 2671177848Sdavidxu 2672177848Sdavidxu umtxq_lock(&uq->uq_key); 2673177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2674177848Sdavidxu umtxq_unlock(&uq->uq_key); 2675177848Sdavidxu } 2676177848Sdavidxu 2677177848Sdavidxu umtx_key_release(&uq->uq_key); 2678177848Sdavidxu return (error); 2679177848Sdavidxu} 2680177848Sdavidxu 2681177848Sdavidxustatic int 2682177848Sdavidxudo_rw_wrlock2(struct thread *td, void *obj, struct timespec *timeout) 2683177848Sdavidxu{ 2684177848Sdavidxu struct timespec ts, ts2, ts3; 2685177848Sdavidxu struct timeval tv; 2686177848Sdavidxu int error; 2687177848Sdavidxu 2688177848Sdavidxu getnanouptime(&ts); 2689177848Sdavidxu timespecadd(&ts, timeout); 2690177848Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 2691177848Sdavidxu for (;;) { 2692177848Sdavidxu error = do_rw_wrlock(td, obj, tvtohz(&tv)); 2693177848Sdavidxu if (error != ETIMEDOUT) 2694177848Sdavidxu break; 2695177848Sdavidxu getnanouptime(&ts2); 2696177848Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 2697177848Sdavidxu error = ETIMEDOUT; 2698177848Sdavidxu break; 2699177848Sdavidxu } 2700177848Sdavidxu ts3 = ts; 2701177848Sdavidxu timespecsub(&ts3, &ts2); 2702177848Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 2703177848Sdavidxu } 2704177849Sdavidxu if (error == ERESTART) 2705177849Sdavidxu error = EINTR; 2706177848Sdavidxu return (error); 2707177848Sdavidxu} 2708177848Sdavidxu 2709177848Sdavidxustatic int 2710177880Sdavidxudo_rw_unlock(struct thread *td, struct urwlock *rwlock) 2711177848Sdavidxu{ 2712177848Sdavidxu struct umtx_q *uq; 2713177848Sdavidxu uint32_t flags; 2714177848Sdavidxu int32_t state, oldstate; 2715177848Sdavidxu int error, q, count; 2716177848Sdavidxu 2717177848Sdavidxu uq = td->td_umtxq; 2718177848Sdavidxu flags = fuword32(&rwlock->rw_flags); 2719177848Sdavidxu error = umtx_key_get(rwlock, TYPE_RWLOCK, GET_SHARE(flags), &uq->uq_key); 2720177848Sdavidxu if (error != 0) 2721177848Sdavidxu return (error); 2722177848Sdavidxu 2723177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2724177848Sdavidxu if (state & URWLOCK_WRITE_OWNER) { 2725177848Sdavidxu for (;;) { 2726177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, 2727177848Sdavidxu state & ~URWLOCK_WRITE_OWNER); 2728177848Sdavidxu if (oldstate != state) { 2729177848Sdavidxu state = oldstate; 2730177848Sdavidxu if (!(oldstate & URWLOCK_WRITE_OWNER)) { 2731177848Sdavidxu error = EPERM; 2732177848Sdavidxu goto out; 2733177848Sdavidxu } 2734177848Sdavidxu } else 2735177848Sdavidxu break; 2736177848Sdavidxu } 2737177848Sdavidxu } else if (URWLOCK_READER_COUNT(state) != 0) { 2738177848Sdavidxu for (;;) { 2739177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, 2740177848Sdavidxu state - 1); 2741177848Sdavidxu if (oldstate != state) { 2742177848Sdavidxu state = oldstate; 2743177848Sdavidxu if (URWLOCK_READER_COUNT(oldstate) == 0) { 2744177848Sdavidxu error = EPERM; 2745177848Sdavidxu goto out; 2746177848Sdavidxu } 2747177848Sdavidxu } 2748177848Sdavidxu else 2749177848Sdavidxu break; 2750177848Sdavidxu } 2751177848Sdavidxu } else { 2752177848Sdavidxu error = EPERM; 2753177848Sdavidxu goto out; 2754177848Sdavidxu } 2755177848Sdavidxu 2756177848Sdavidxu count = 0; 2757177848Sdavidxu 2758177848Sdavidxu if (!(flags & URWLOCK_PREFER_READER)) { 2759177848Sdavidxu if (state & URWLOCK_WRITE_WAITERS) { 2760177848Sdavidxu count = 1; 2761177848Sdavidxu q = UMTX_EXCLUSIVE_QUEUE; 2762177848Sdavidxu } else if (state & URWLOCK_READ_WAITERS) { 2763177848Sdavidxu count = INT_MAX; 2764177848Sdavidxu q = UMTX_SHARED_QUEUE; 2765177848Sdavidxu } 2766177848Sdavidxu } else { 2767177848Sdavidxu if (state & URWLOCK_READ_WAITERS) { 2768177848Sdavidxu count = INT_MAX; 2769177848Sdavidxu q = UMTX_SHARED_QUEUE; 2770177848Sdavidxu } else if (state & URWLOCK_WRITE_WAITERS) { 2771177848Sdavidxu count = 1; 2772177848Sdavidxu q = UMTX_EXCLUSIVE_QUEUE; 2773177848Sdavidxu } 2774177848Sdavidxu } 2775177848Sdavidxu 2776177848Sdavidxu if (count) { 2777177848Sdavidxu umtxq_lock(&uq->uq_key); 2778177848Sdavidxu umtxq_busy(&uq->uq_key); 2779177848Sdavidxu umtxq_signal_queue(&uq->uq_key, count, q); 2780177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2781177848Sdavidxu umtxq_unlock(&uq->uq_key); 2782177848Sdavidxu } 2783177848Sdavidxuout: 2784177848Sdavidxu umtx_key_release(&uq->uq_key); 2785177848Sdavidxu return (error); 2786177848Sdavidxu} 2787177848Sdavidxu 2788201472Sdavidxustatic int 2789201472Sdavidxudo_sem_wait(struct thread *td, struct _usem *sem, struct timespec *timeout) 2790201472Sdavidxu{ 2791201472Sdavidxu struct umtx_q *uq; 2792201472Sdavidxu struct timeval tv; 2793201472Sdavidxu struct timespec cts, ets, tts; 2794201472Sdavidxu uint32_t flags, count; 2795201472Sdavidxu int error; 2796201472Sdavidxu 2797201472Sdavidxu uq = td->td_umtxq; 2798201472Sdavidxu flags = fuword32(&sem->_flags); 2799201885Sdavidxu error = umtx_key_get(sem, TYPE_SEM, GET_SHARE(flags), &uq->uq_key); 2800201472Sdavidxu if (error != 0) 2801201472Sdavidxu return (error); 2802201472Sdavidxu umtxq_lock(&uq->uq_key); 2803201472Sdavidxu umtxq_busy(&uq->uq_key); 2804201472Sdavidxu umtxq_insert(uq); 2805201472Sdavidxu umtxq_unlock(&uq->uq_key); 2806201472Sdavidxu 2807215652Sdavidxu if (fuword32(__DEVOLATILE(uint32_t *, &sem->_has_waiters)) == 0) 2808215652Sdavidxu casuword32(__DEVOLATILE(uint32_t *, &sem->_has_waiters), 0, 1); 2809203657Sdavidxu 2810201472Sdavidxu count = fuword32(__DEVOLATILE(uint32_t *, &sem->_count)); 2811201472Sdavidxu if (count != 0) { 2812201472Sdavidxu umtxq_lock(&uq->uq_key); 2813201472Sdavidxu umtxq_unbusy(&uq->uq_key); 2814201472Sdavidxu umtxq_remove(uq); 2815201472Sdavidxu umtxq_unlock(&uq->uq_key); 2816201472Sdavidxu umtx_key_release(&uq->uq_key); 2817201472Sdavidxu return (0); 2818201472Sdavidxu } 2819201472Sdavidxu 2820201472Sdavidxu umtxq_lock(&uq->uq_key); 2821201472Sdavidxu umtxq_unbusy(&uq->uq_key); 2822201472Sdavidxu umtxq_unlock(&uq->uq_key); 2823201472Sdavidxu 2824201472Sdavidxu umtxq_lock(&uq->uq_key); 2825201472Sdavidxu if (timeout == NULL) { 2826201472Sdavidxu error = umtxq_sleep(uq, "usem", 0); 2827201472Sdavidxu } else { 2828201472Sdavidxu getnanouptime(&ets); 2829201472Sdavidxu timespecadd(&ets, timeout); 2830201472Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 2831201472Sdavidxu for (;;) { 2832201472Sdavidxu error = umtxq_sleep(uq, "usem", tvtohz(&tv)); 2833201472Sdavidxu if (error != ETIMEDOUT) 2834201472Sdavidxu break; 2835201472Sdavidxu getnanouptime(&cts); 2836201472Sdavidxu if (timespeccmp(&cts, &ets, >=)) { 2837201472Sdavidxu error = ETIMEDOUT; 2838201472Sdavidxu break; 2839201472Sdavidxu } 2840201472Sdavidxu tts = ets; 2841201472Sdavidxu timespecsub(&tts, &cts); 2842201472Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &tts); 2843201472Sdavidxu } 2844201472Sdavidxu } 2845201472Sdavidxu 2846211794Sdavidxu if ((uq->uq_flags & UQF_UMTXQ) == 0) 2847211794Sdavidxu error = 0; 2848211794Sdavidxu else { 2849211794Sdavidxu umtxq_remove(uq); 2850201472Sdavidxu if (error == ERESTART) 2851201472Sdavidxu error = EINTR; 2852201472Sdavidxu } 2853201472Sdavidxu umtxq_unlock(&uq->uq_key); 2854201472Sdavidxu umtx_key_release(&uq->uq_key); 2855201472Sdavidxu return (error); 2856201472Sdavidxu} 2857201472Sdavidxu 2858201472Sdavidxu/* 2859201472Sdavidxu * Signal a userland condition variable. 2860201472Sdavidxu */ 2861201472Sdavidxustatic int 2862201472Sdavidxudo_sem_wake(struct thread *td, struct _usem *sem) 2863201472Sdavidxu{ 2864201472Sdavidxu struct umtx_key key; 2865201472Sdavidxu int error, cnt, nwake; 2866201472Sdavidxu uint32_t flags; 2867201472Sdavidxu 2868201472Sdavidxu flags = fuword32(&sem->_flags); 2869201885Sdavidxu if ((error = umtx_key_get(sem, TYPE_SEM, GET_SHARE(flags), &key)) != 0) 2870201472Sdavidxu return (error); 2871201472Sdavidxu umtxq_lock(&key); 2872201472Sdavidxu umtxq_busy(&key); 2873201472Sdavidxu cnt = umtxq_count(&key); 2874201472Sdavidxu nwake = umtxq_signal(&key, 1); 2875201472Sdavidxu if (cnt <= nwake) { 2876201472Sdavidxu umtxq_unlock(&key); 2877201472Sdavidxu error = suword32( 2878201472Sdavidxu __DEVOLATILE(uint32_t *, &sem->_has_waiters), 0); 2879201472Sdavidxu umtxq_lock(&key); 2880201472Sdavidxu } 2881201472Sdavidxu umtxq_unbusy(&key); 2882201472Sdavidxu umtxq_unlock(&key); 2883201472Sdavidxu umtx_key_release(&key); 2884201472Sdavidxu return (error); 2885201472Sdavidxu} 2886201472Sdavidxu 2887139013Sdavidxuint 2888225617Skmacysys__umtx_lock(struct thread *td, struct _umtx_lock_args *uap) 2889139013Sdavidxu /* struct umtx *umtx */ 2890139013Sdavidxu{ 2891162536Sdavidxu return _do_lock_umtx(td, uap->umtx, td->td_tid, 0); 2892139013Sdavidxu} 2893139013Sdavidxu 2894139013Sdavidxuint 2895225617Skmacysys__umtx_unlock(struct thread *td, struct _umtx_unlock_args *uap) 2896139013Sdavidxu /* struct umtx *umtx */ 2897139013Sdavidxu{ 2898162536Sdavidxu return do_unlock_umtx(td, uap->umtx, td->td_tid); 2899139013Sdavidxu} 2900139013Sdavidxu 2901162536Sdavidxustatic int 2902162536Sdavidxu__umtx_op_lock_umtx(struct thread *td, struct _umtx_op_args *uap) 2903139013Sdavidxu{ 2904162536Sdavidxu struct timespec *ts, timeout; 2905139013Sdavidxu int error; 2906139013Sdavidxu 2907162536Sdavidxu /* Allow a null timespec (wait forever). */ 2908162536Sdavidxu if (uap->uaddr2 == NULL) 2909162536Sdavidxu ts = NULL; 2910162536Sdavidxu else { 2911162536Sdavidxu error = copyin(uap->uaddr2, &timeout, sizeof(timeout)); 2912162536Sdavidxu if (error != 0) 2913162536Sdavidxu return (error); 2914162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2915162536Sdavidxu timeout.tv_nsec < 0) { 2916162536Sdavidxu return (EINVAL); 2917161678Sdavidxu } 2918162536Sdavidxu ts = &timeout; 2919162536Sdavidxu } 2920162536Sdavidxu return (do_lock_umtx(td, uap->obj, uap->val, ts)); 2921162536Sdavidxu} 2922162536Sdavidxu 2923162536Sdavidxustatic int 2924162536Sdavidxu__umtx_op_unlock_umtx(struct thread *td, struct _umtx_op_args *uap) 2925162536Sdavidxu{ 2926162536Sdavidxu return (do_unlock_umtx(td, uap->obj, uap->val)); 2927162536Sdavidxu} 2928162536Sdavidxu 2929162536Sdavidxustatic int 2930162536Sdavidxu__umtx_op_wait(struct thread *td, struct _umtx_op_args *uap) 2931162536Sdavidxu{ 2932162536Sdavidxu struct timespec *ts, timeout; 2933162536Sdavidxu int error; 2934162536Sdavidxu 2935162536Sdavidxu if (uap->uaddr2 == NULL) 2936162536Sdavidxu ts = NULL; 2937162536Sdavidxu else { 2938162536Sdavidxu error = copyin(uap->uaddr2, &timeout, sizeof(timeout)); 2939162536Sdavidxu if (error != 0) 2940162536Sdavidxu return (error); 2941162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2942162536Sdavidxu timeout.tv_nsec < 0) 2943162536Sdavidxu return (EINVAL); 2944162536Sdavidxu ts = &timeout; 2945162536Sdavidxu } 2946178646Sdavidxu return do_wait(td, uap->obj, uap->val, ts, 0, 0); 2947162536Sdavidxu} 2948162536Sdavidxu 2949162536Sdavidxustatic int 2950173800Sdavidxu__umtx_op_wait_uint(struct thread *td, struct _umtx_op_args *uap) 2951173800Sdavidxu{ 2952173800Sdavidxu struct timespec *ts, timeout; 2953173800Sdavidxu int error; 2954173800Sdavidxu 2955173800Sdavidxu if (uap->uaddr2 == NULL) 2956173800Sdavidxu ts = NULL; 2957173800Sdavidxu else { 2958173800Sdavidxu error = copyin(uap->uaddr2, &timeout, sizeof(timeout)); 2959173800Sdavidxu if (error != 0) 2960173800Sdavidxu return (error); 2961173800Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2962173800Sdavidxu timeout.tv_nsec < 0) 2963173800Sdavidxu return (EINVAL); 2964173800Sdavidxu ts = &timeout; 2965173800Sdavidxu } 2966178646Sdavidxu return do_wait(td, uap->obj, uap->val, ts, 1, 0); 2967173800Sdavidxu} 2968173800Sdavidxu 2969173800Sdavidxustatic int 2970178646Sdavidxu__umtx_op_wait_uint_private(struct thread *td, struct _umtx_op_args *uap) 2971178646Sdavidxu{ 2972178646Sdavidxu struct timespec *ts, timeout; 2973178646Sdavidxu int error; 2974178646Sdavidxu 2975178646Sdavidxu if (uap->uaddr2 == NULL) 2976178646Sdavidxu ts = NULL; 2977178646Sdavidxu else { 2978178646Sdavidxu error = copyin(uap->uaddr2, &timeout, sizeof(timeout)); 2979178646Sdavidxu if (error != 0) 2980178646Sdavidxu return (error); 2981178646Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2982178646Sdavidxu timeout.tv_nsec < 0) 2983178646Sdavidxu return (EINVAL); 2984178646Sdavidxu ts = &timeout; 2985178646Sdavidxu } 2986178646Sdavidxu return do_wait(td, uap->obj, uap->val, ts, 1, 1); 2987178646Sdavidxu} 2988178646Sdavidxu 2989178646Sdavidxustatic int 2990162536Sdavidxu__umtx_op_wake(struct thread *td, struct _umtx_op_args *uap) 2991162536Sdavidxu{ 2992178646Sdavidxu return (kern_umtx_wake(td, uap->obj, uap->val, 0)); 2993162536Sdavidxu} 2994162536Sdavidxu 2995216641Sdavidxu#define BATCH_SIZE 128 2996162536Sdavidxustatic int 2997216641Sdavidxu__umtx_op_nwake_private(struct thread *td, struct _umtx_op_args *uap) 2998216641Sdavidxu{ 2999216641Sdavidxu int count = uap->val; 3000216641Sdavidxu void *uaddrs[BATCH_SIZE]; 3001216641Sdavidxu char **upp = (char **)uap->obj; 3002216641Sdavidxu int tocopy; 3003216641Sdavidxu int error = 0; 3004216641Sdavidxu int i, pos = 0; 3005216641Sdavidxu 3006216641Sdavidxu while (count > 0) { 3007216641Sdavidxu tocopy = count; 3008216641Sdavidxu if (tocopy > BATCH_SIZE) 3009216641Sdavidxu tocopy = BATCH_SIZE; 3010216641Sdavidxu error = copyin(upp+pos, uaddrs, tocopy * sizeof(char *)); 3011216641Sdavidxu if (error != 0) 3012216641Sdavidxu break; 3013216641Sdavidxu for (i = 0; i < tocopy; ++i) 3014216641Sdavidxu kern_umtx_wake(td, uaddrs[i], INT_MAX, 1); 3015216641Sdavidxu count -= tocopy; 3016216641Sdavidxu pos += tocopy; 3017216641Sdavidxu } 3018216641Sdavidxu return (error); 3019216641Sdavidxu} 3020216641Sdavidxu 3021216641Sdavidxustatic int 3022178646Sdavidxu__umtx_op_wake_private(struct thread *td, struct _umtx_op_args *uap) 3023178646Sdavidxu{ 3024178646Sdavidxu return (kern_umtx_wake(td, uap->obj, uap->val, 1)); 3025178646Sdavidxu} 3026178646Sdavidxu 3027178646Sdavidxustatic int 3028162536Sdavidxu__umtx_op_lock_umutex(struct thread *td, struct _umtx_op_args *uap) 3029162536Sdavidxu{ 3030162536Sdavidxu struct timespec *ts, timeout; 3031162536Sdavidxu int error; 3032162536Sdavidxu 3033162536Sdavidxu /* Allow a null timespec (wait forever). */ 3034162536Sdavidxu if (uap->uaddr2 == NULL) 3035162536Sdavidxu ts = NULL; 3036162536Sdavidxu else { 3037162536Sdavidxu error = copyin(uap->uaddr2, &timeout, 3038162536Sdavidxu sizeof(timeout)); 3039162536Sdavidxu if (error != 0) 3040162536Sdavidxu return (error); 3041162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 3042162536Sdavidxu timeout.tv_nsec < 0) { 3043162536Sdavidxu return (EINVAL); 3044139013Sdavidxu } 3045162536Sdavidxu ts = &timeout; 3046139013Sdavidxu } 3047162536Sdavidxu return do_lock_umutex(td, uap->obj, ts, 0); 3048162536Sdavidxu} 3049162536Sdavidxu 3050162536Sdavidxustatic int 3051162536Sdavidxu__umtx_op_trylock_umutex(struct thread *td, struct _umtx_op_args *uap) 3052162536Sdavidxu{ 3053179970Sdavidxu return do_lock_umutex(td, uap->obj, NULL, _UMUTEX_TRY); 3054162536Sdavidxu} 3055162536Sdavidxu 3056162536Sdavidxustatic int 3057179970Sdavidxu__umtx_op_wait_umutex(struct thread *td, struct _umtx_op_args *uap) 3058179970Sdavidxu{ 3059179970Sdavidxu struct timespec *ts, timeout; 3060179970Sdavidxu int error; 3061179970Sdavidxu 3062179970Sdavidxu /* Allow a null timespec (wait forever). */ 3063179970Sdavidxu if (uap->uaddr2 == NULL) 3064179970Sdavidxu ts = NULL; 3065179970Sdavidxu else { 3066179970Sdavidxu error = copyin(uap->uaddr2, &timeout, 3067179970Sdavidxu sizeof(timeout)); 3068179970Sdavidxu if (error != 0) 3069179970Sdavidxu return (error); 3070179970Sdavidxu if (timeout.tv_nsec >= 1000000000 || 3071179970Sdavidxu timeout.tv_nsec < 0) { 3072179970Sdavidxu return (EINVAL); 3073179970Sdavidxu } 3074179970Sdavidxu ts = &timeout; 3075179970Sdavidxu } 3076179970Sdavidxu return do_lock_umutex(td, uap->obj, ts, _UMUTEX_WAIT); 3077179970Sdavidxu} 3078179970Sdavidxu 3079179970Sdavidxustatic int 3080179970Sdavidxu__umtx_op_wake_umutex(struct thread *td, struct _umtx_op_args *uap) 3081179970Sdavidxu{ 3082179970Sdavidxu return do_wake_umutex(td, uap->obj); 3083179970Sdavidxu} 3084179970Sdavidxu 3085179970Sdavidxustatic int 3086162536Sdavidxu__umtx_op_unlock_umutex(struct thread *td, struct _umtx_op_args *uap) 3087162536Sdavidxu{ 3088162536Sdavidxu return do_unlock_umutex(td, uap->obj); 3089162536Sdavidxu} 3090162536Sdavidxu 3091162536Sdavidxustatic int 3092162536Sdavidxu__umtx_op_set_ceiling(struct thread *td, struct _umtx_op_args *uap) 3093162536Sdavidxu{ 3094162536Sdavidxu return do_set_ceiling(td, uap->obj, uap->val, uap->uaddr1); 3095162536Sdavidxu} 3096162536Sdavidxu 3097164839Sdavidxustatic int 3098164839Sdavidxu__umtx_op_cv_wait(struct thread *td, struct _umtx_op_args *uap) 3099164839Sdavidxu{ 3100164839Sdavidxu struct timespec *ts, timeout; 3101164839Sdavidxu int error; 3102164839Sdavidxu 3103164839Sdavidxu /* Allow a null timespec (wait forever). */ 3104164839Sdavidxu if (uap->uaddr2 == NULL) 3105164839Sdavidxu ts = NULL; 3106164839Sdavidxu else { 3107164839Sdavidxu error = copyin(uap->uaddr2, &timeout, 3108164839Sdavidxu sizeof(timeout)); 3109164839Sdavidxu if (error != 0) 3110164839Sdavidxu return (error); 3111164839Sdavidxu if (timeout.tv_nsec >= 1000000000 || 3112164839Sdavidxu timeout.tv_nsec < 0) { 3113164839Sdavidxu return (EINVAL); 3114164839Sdavidxu } 3115164839Sdavidxu ts = &timeout; 3116164839Sdavidxu } 3117164876Sdavidxu return (do_cv_wait(td, uap->obj, uap->uaddr1, ts, uap->val)); 3118164839Sdavidxu} 3119164839Sdavidxu 3120164839Sdavidxustatic int 3121164839Sdavidxu__umtx_op_cv_signal(struct thread *td, struct _umtx_op_args *uap) 3122164839Sdavidxu{ 3123164839Sdavidxu return do_cv_signal(td, uap->obj); 3124164839Sdavidxu} 3125164839Sdavidxu 3126164839Sdavidxustatic int 3127164839Sdavidxu__umtx_op_cv_broadcast(struct thread *td, struct _umtx_op_args *uap) 3128164839Sdavidxu{ 3129164839Sdavidxu return do_cv_broadcast(td, uap->obj); 3130164839Sdavidxu} 3131164839Sdavidxu 3132177848Sdavidxustatic int 3133177848Sdavidxu__umtx_op_rw_rdlock(struct thread *td, struct _umtx_op_args *uap) 3134177848Sdavidxu{ 3135177848Sdavidxu struct timespec timeout; 3136177848Sdavidxu int error; 3137177848Sdavidxu 3138177848Sdavidxu /* Allow a null timespec (wait forever). */ 3139177848Sdavidxu if (uap->uaddr2 == NULL) { 3140177848Sdavidxu error = do_rw_rdlock(td, uap->obj, uap->val, 0); 3141177848Sdavidxu } else { 3142177848Sdavidxu error = copyin(uap->uaddr2, &timeout, 3143177848Sdavidxu sizeof(timeout)); 3144177848Sdavidxu if (error != 0) 3145177848Sdavidxu return (error); 3146177848Sdavidxu if (timeout.tv_nsec >= 1000000000 || 3147177848Sdavidxu timeout.tv_nsec < 0) { 3148177848Sdavidxu return (EINVAL); 3149177848Sdavidxu } 3150177848Sdavidxu error = do_rw_rdlock2(td, uap->obj, uap->val, &timeout); 3151177848Sdavidxu } 3152177848Sdavidxu return (error); 3153177848Sdavidxu} 3154177848Sdavidxu 3155177848Sdavidxustatic int 3156177848Sdavidxu__umtx_op_rw_wrlock(struct thread *td, struct _umtx_op_args *uap) 3157177848Sdavidxu{ 3158177848Sdavidxu struct timespec timeout; 3159177848Sdavidxu int error; 3160177848Sdavidxu 3161177848Sdavidxu /* Allow a null timespec (wait forever). */ 3162177848Sdavidxu if (uap->uaddr2 == NULL) { 3163177848Sdavidxu error = do_rw_wrlock(td, uap->obj, 0); 3164177848Sdavidxu } else { 3165177848Sdavidxu error = copyin(uap->uaddr2, &timeout, 3166177848Sdavidxu sizeof(timeout)); 3167177848Sdavidxu if (error != 0) 3168177848Sdavidxu return (error); 3169177848Sdavidxu if (timeout.tv_nsec >= 1000000000 || 3170177848Sdavidxu timeout.tv_nsec < 0) { 3171177848Sdavidxu return (EINVAL); 3172177848Sdavidxu } 3173177848Sdavidxu 3174177848Sdavidxu error = do_rw_wrlock2(td, uap->obj, &timeout); 3175177848Sdavidxu } 3176177848Sdavidxu return (error); 3177177848Sdavidxu} 3178177848Sdavidxu 3179177848Sdavidxustatic int 3180177848Sdavidxu__umtx_op_rw_unlock(struct thread *td, struct _umtx_op_args *uap) 3181177848Sdavidxu{ 3182177880Sdavidxu return do_rw_unlock(td, uap->obj); 3183177848Sdavidxu} 3184177848Sdavidxu 3185201472Sdavidxustatic int 3186201472Sdavidxu__umtx_op_sem_wait(struct thread *td, struct _umtx_op_args *uap) 3187201472Sdavidxu{ 3188201472Sdavidxu struct timespec *ts, timeout; 3189201472Sdavidxu int error; 3190201472Sdavidxu 3191201472Sdavidxu /* Allow a null timespec (wait forever). */ 3192201472Sdavidxu if (uap->uaddr2 == NULL) 3193201472Sdavidxu ts = NULL; 3194201472Sdavidxu else { 3195201472Sdavidxu error = copyin(uap->uaddr2, &timeout, 3196201472Sdavidxu sizeof(timeout)); 3197201472Sdavidxu if (error != 0) 3198201472Sdavidxu return (error); 3199201472Sdavidxu if (timeout.tv_nsec >= 1000000000 || 3200201472Sdavidxu timeout.tv_nsec < 0) { 3201201472Sdavidxu return (EINVAL); 3202201472Sdavidxu } 3203201472Sdavidxu ts = &timeout; 3204201472Sdavidxu } 3205201472Sdavidxu return (do_sem_wait(td, uap->obj, ts)); 3206201472Sdavidxu} 3207201472Sdavidxu 3208201472Sdavidxustatic int 3209201472Sdavidxu__umtx_op_sem_wake(struct thread *td, struct _umtx_op_args *uap) 3210201472Sdavidxu{ 3211201472Sdavidxu return do_sem_wake(td, uap->obj); 3212201472Sdavidxu} 3213201472Sdavidxu 3214162536Sdavidxutypedef int (*_umtx_op_func)(struct thread *td, struct _umtx_op_args *uap); 3215162536Sdavidxu 3216162536Sdavidxustatic _umtx_op_func op_table[] = { 3217162536Sdavidxu __umtx_op_lock_umtx, /* UMTX_OP_LOCK */ 3218162536Sdavidxu __umtx_op_unlock_umtx, /* UMTX_OP_UNLOCK */ 3219162536Sdavidxu __umtx_op_wait, /* UMTX_OP_WAIT */ 3220162536Sdavidxu __umtx_op_wake, /* UMTX_OP_WAKE */ 3221162536Sdavidxu __umtx_op_trylock_umutex, /* UMTX_OP_MUTEX_TRYLOCK */ 3222162536Sdavidxu __umtx_op_lock_umutex, /* UMTX_OP_MUTEX_LOCK */ 3223162536Sdavidxu __umtx_op_unlock_umutex, /* UMTX_OP_MUTEX_UNLOCK */ 3224164839Sdavidxu __umtx_op_set_ceiling, /* UMTX_OP_SET_CEILING */ 3225164839Sdavidxu __umtx_op_cv_wait, /* UMTX_OP_CV_WAIT*/ 3226164839Sdavidxu __umtx_op_cv_signal, /* UMTX_OP_CV_SIGNAL */ 3227173800Sdavidxu __umtx_op_cv_broadcast, /* UMTX_OP_CV_BROADCAST */ 3228177848Sdavidxu __umtx_op_wait_uint, /* UMTX_OP_WAIT_UINT */ 3229177848Sdavidxu __umtx_op_rw_rdlock, /* UMTX_OP_RW_RDLOCK */ 3230177848Sdavidxu __umtx_op_rw_wrlock, /* UMTX_OP_RW_WRLOCK */ 3231178646Sdavidxu __umtx_op_rw_unlock, /* UMTX_OP_RW_UNLOCK */ 3232178646Sdavidxu __umtx_op_wait_uint_private, /* UMTX_OP_WAIT_UINT_PRIVATE */ 3233179970Sdavidxu __umtx_op_wake_private, /* UMTX_OP_WAKE_PRIVATE */ 3234179970Sdavidxu __umtx_op_wait_umutex, /* UMTX_OP_UMUTEX_WAIT */ 3235201472Sdavidxu __umtx_op_wake_umutex, /* UMTX_OP_UMUTEX_WAKE */ 3236201472Sdavidxu __umtx_op_sem_wait, /* UMTX_OP_SEM_WAIT */ 3237216641Sdavidxu __umtx_op_sem_wake, /* UMTX_OP_SEM_WAKE */ 3238216641Sdavidxu __umtx_op_nwake_private /* UMTX_OP_NWAKE_PRIVATE */ 3239162536Sdavidxu}; 3240162536Sdavidxu 3241162536Sdavidxuint 3242225617Skmacysys__umtx_op(struct thread *td, struct _umtx_op_args *uap) 3243162536Sdavidxu{ 3244163678Sdavidxu if ((unsigned)uap->op < UMTX_OP_MAX) 3245162536Sdavidxu return (*op_table[uap->op])(td, uap); 3246162536Sdavidxu return (EINVAL); 3247162536Sdavidxu} 3248162536Sdavidxu 3249205014Snwhitehorn#ifdef COMPAT_FREEBSD32 3250163046Sdavidxuint 3251163046Sdavidxufreebsd32_umtx_lock(struct thread *td, struct freebsd32_umtx_lock_args *uap) 3252163046Sdavidxu /* struct umtx *umtx */ 3253163046Sdavidxu{ 3254163046Sdavidxu return (do_lock_umtx32(td, (uint32_t *)uap->umtx, td->td_tid, NULL)); 3255163046Sdavidxu} 3256163046Sdavidxu 3257163046Sdavidxuint 3258163046Sdavidxufreebsd32_umtx_unlock(struct thread *td, struct freebsd32_umtx_unlock_args *uap) 3259163046Sdavidxu /* struct umtx *umtx */ 3260163046Sdavidxu{ 3261163046Sdavidxu return (do_unlock_umtx32(td, (uint32_t *)uap->umtx, td->td_tid)); 3262163046Sdavidxu} 3263163046Sdavidxu 3264162536Sdavidxustruct timespec32 { 3265209390Sed uint32_t tv_sec; 3266209390Sed uint32_t tv_nsec; 3267162536Sdavidxu}; 3268162536Sdavidxu 3269162536Sdavidxustatic inline int 3270228218Sphoumtx_copyin_timeout32(void *addr, struct timespec *tsp) 3271162536Sdavidxu{ 3272162536Sdavidxu struct timespec32 ts32; 3273162536Sdavidxu int error; 3274162536Sdavidxu 3275162536Sdavidxu error = copyin(addr, &ts32, sizeof(struct timespec32)); 3276162536Sdavidxu if (error == 0) { 3277228218Spho if (ts32.tv_sec < 0 || 3278228218Spho ts32.tv_nsec >= 1000000000 || 3279228218Spho ts32.tv_nsec < 0) 3280228218Spho error = EINVAL; 3281228218Spho else { 3282228218Spho tsp->tv_sec = ts32.tv_sec; 3283228218Spho tsp->tv_nsec = ts32.tv_nsec; 3284228218Spho } 3285162536Sdavidxu } 3286140421Sdavidxu return (error); 3287139013Sdavidxu} 3288161678Sdavidxu 3289162536Sdavidxustatic int 3290162536Sdavidxu__umtx_op_lock_umtx_compat32(struct thread *td, struct _umtx_op_args *uap) 3291162536Sdavidxu{ 3292162536Sdavidxu struct timespec *ts, timeout; 3293162536Sdavidxu int error; 3294162536Sdavidxu 3295162536Sdavidxu /* Allow a null timespec (wait forever). */ 3296162536Sdavidxu if (uap->uaddr2 == NULL) 3297162536Sdavidxu ts = NULL; 3298162536Sdavidxu else { 3299228218Spho error = umtx_copyin_timeout32(uap->uaddr2, &timeout); 3300162536Sdavidxu if (error != 0) 3301162536Sdavidxu return (error); 3302162536Sdavidxu ts = &timeout; 3303162536Sdavidxu } 3304162536Sdavidxu return (do_lock_umtx32(td, uap->obj, uap->val, ts)); 3305162536Sdavidxu} 3306162536Sdavidxu 3307162536Sdavidxustatic int 3308162536Sdavidxu__umtx_op_unlock_umtx_compat32(struct thread *td, struct _umtx_op_args *uap) 3309162536Sdavidxu{ 3310162536Sdavidxu return (do_unlock_umtx32(td, uap->obj, (uint32_t)uap->val)); 3311162536Sdavidxu} 3312162536Sdavidxu 3313162536Sdavidxustatic int 3314162536Sdavidxu__umtx_op_wait_compat32(struct thread *td, struct _umtx_op_args *uap) 3315162536Sdavidxu{ 3316162536Sdavidxu struct timespec *ts, timeout; 3317162536Sdavidxu int error; 3318162536Sdavidxu 3319162536Sdavidxu if (uap->uaddr2 == NULL) 3320162536Sdavidxu ts = NULL; 3321162536Sdavidxu else { 3322228218Spho error = umtx_copyin_timeout32(uap->uaddr2, &timeout); 3323162536Sdavidxu if (error != 0) 3324162536Sdavidxu return (error); 3325162536Sdavidxu ts = &timeout; 3326162536Sdavidxu } 3327178646Sdavidxu return do_wait(td, uap->obj, uap->val, ts, 1, 0); 3328162536Sdavidxu} 3329162536Sdavidxu 3330162536Sdavidxustatic int 3331162536Sdavidxu__umtx_op_lock_umutex_compat32(struct thread *td, struct _umtx_op_args *uap) 3332162536Sdavidxu{ 3333162536Sdavidxu struct timespec *ts, timeout; 3334162536Sdavidxu int error; 3335162536Sdavidxu 3336162536Sdavidxu /* Allow a null timespec (wait forever). */ 3337162536Sdavidxu if (uap->uaddr2 == NULL) 3338162536Sdavidxu ts = NULL; 3339162536Sdavidxu else { 3340228218Spho error = umtx_copyin_timeout32(uap->uaddr2, &timeout); 3341162536Sdavidxu if (error != 0) 3342162536Sdavidxu return (error); 3343162536Sdavidxu ts = &timeout; 3344162536Sdavidxu } 3345162536Sdavidxu return do_lock_umutex(td, uap->obj, ts, 0); 3346162536Sdavidxu} 3347162536Sdavidxu 3348164839Sdavidxustatic int 3349179970Sdavidxu__umtx_op_wait_umutex_compat32(struct thread *td, struct _umtx_op_args *uap) 3350179970Sdavidxu{ 3351179970Sdavidxu struct timespec *ts, timeout; 3352179970Sdavidxu int error; 3353179970Sdavidxu 3354179970Sdavidxu /* Allow a null timespec (wait forever). */ 3355179970Sdavidxu if (uap->uaddr2 == NULL) 3356179970Sdavidxu ts = NULL; 3357179970Sdavidxu else { 3358228218Spho error = umtx_copyin_timeout32(uap->uaddr2, &timeout); 3359179970Sdavidxu if (error != 0) 3360179970Sdavidxu return (error); 3361179970Sdavidxu ts = &timeout; 3362179970Sdavidxu } 3363179970Sdavidxu return do_lock_umutex(td, uap->obj, ts, _UMUTEX_WAIT); 3364179970Sdavidxu} 3365179970Sdavidxu 3366179970Sdavidxustatic int 3367164839Sdavidxu__umtx_op_cv_wait_compat32(struct thread *td, struct _umtx_op_args *uap) 3368164839Sdavidxu{ 3369164839Sdavidxu struct timespec *ts, timeout; 3370164839Sdavidxu int error; 3371164839Sdavidxu 3372164839Sdavidxu /* Allow a null timespec (wait forever). */ 3373164839Sdavidxu if (uap->uaddr2 == NULL) 3374164839Sdavidxu ts = NULL; 3375164839Sdavidxu else { 3376228218Spho error = umtx_copyin_timeout32(uap->uaddr2, &timeout); 3377164839Sdavidxu if (error != 0) 3378164839Sdavidxu return (error); 3379164839Sdavidxu ts = &timeout; 3380164839Sdavidxu } 3381164876Sdavidxu return (do_cv_wait(td, uap->obj, uap->uaddr1, ts, uap->val)); 3382164839Sdavidxu} 3383164839Sdavidxu 3384177848Sdavidxustatic int 3385177848Sdavidxu__umtx_op_rw_rdlock_compat32(struct thread *td, struct _umtx_op_args *uap) 3386177848Sdavidxu{ 3387177848Sdavidxu struct timespec timeout; 3388177848Sdavidxu int error; 3389177848Sdavidxu 3390177848Sdavidxu /* Allow a null timespec (wait forever). */ 3391177848Sdavidxu if (uap->uaddr2 == NULL) { 3392177848Sdavidxu error = do_rw_rdlock(td, uap->obj, uap->val, 0); 3393177848Sdavidxu } else { 3394228218Spho error = umtx_copyin_timeout32(uap->uaddr2, &timeout); 3395177848Sdavidxu if (error != 0) 3396177848Sdavidxu return (error); 3397177848Sdavidxu error = do_rw_rdlock2(td, uap->obj, uap->val, &timeout); 3398177848Sdavidxu } 3399177848Sdavidxu return (error); 3400177848Sdavidxu} 3401177848Sdavidxu 3402177848Sdavidxustatic int 3403177848Sdavidxu__umtx_op_rw_wrlock_compat32(struct thread *td, struct _umtx_op_args *uap) 3404177848Sdavidxu{ 3405177848Sdavidxu struct timespec timeout; 3406177848Sdavidxu int error; 3407177848Sdavidxu 3408177848Sdavidxu /* Allow a null timespec (wait forever). */ 3409177848Sdavidxu if (uap->uaddr2 == NULL) { 3410177852Sdavidxu error = do_rw_wrlock(td, uap->obj, 0); 3411177848Sdavidxu } else { 3412228218Spho error = umtx_copyin_timeout32(uap->uaddr2, &timeout); 3413177848Sdavidxu if (error != 0) 3414177848Sdavidxu return (error); 3415177848Sdavidxu 3416177852Sdavidxu error = do_rw_wrlock2(td, uap->obj, &timeout); 3417177848Sdavidxu } 3418177848Sdavidxu return (error); 3419177848Sdavidxu} 3420177848Sdavidxu 3421178646Sdavidxustatic int 3422178646Sdavidxu__umtx_op_wait_uint_private_compat32(struct thread *td, struct _umtx_op_args *uap) 3423178646Sdavidxu{ 3424178646Sdavidxu struct timespec *ts, timeout; 3425178646Sdavidxu int error; 3426178646Sdavidxu 3427178646Sdavidxu if (uap->uaddr2 == NULL) 3428178646Sdavidxu ts = NULL; 3429178646Sdavidxu else { 3430228218Spho error = umtx_copyin_timeout32(uap->uaddr2, &timeout); 3431178646Sdavidxu if (error != 0) 3432178646Sdavidxu return (error); 3433178646Sdavidxu ts = &timeout; 3434178646Sdavidxu } 3435178646Sdavidxu return do_wait(td, uap->obj, uap->val, ts, 1, 1); 3436178646Sdavidxu} 3437178646Sdavidxu 3438201472Sdavidxustatic int 3439201472Sdavidxu__umtx_op_sem_wait_compat32(struct thread *td, struct _umtx_op_args *uap) 3440201472Sdavidxu{ 3441201472Sdavidxu struct timespec *ts, timeout; 3442201472Sdavidxu int error; 3443201472Sdavidxu 3444201472Sdavidxu /* Allow a null timespec (wait forever). */ 3445201472Sdavidxu if (uap->uaddr2 == NULL) 3446201472Sdavidxu ts = NULL; 3447201472Sdavidxu else { 3448228218Spho error = umtx_copyin_timeout32(uap->uaddr2, &timeout); 3449201472Sdavidxu if (error != 0) 3450201472Sdavidxu return (error); 3451201472Sdavidxu ts = &timeout; 3452201472Sdavidxu } 3453201472Sdavidxu return (do_sem_wait(td, uap->obj, ts)); 3454201472Sdavidxu} 3455201472Sdavidxu 3456216641Sdavidxustatic int 3457216641Sdavidxu__umtx_op_nwake_private32(struct thread *td, struct _umtx_op_args *uap) 3458216641Sdavidxu{ 3459216641Sdavidxu int count = uap->val; 3460216641Sdavidxu uint32_t uaddrs[BATCH_SIZE]; 3461216641Sdavidxu uint32_t **upp = (uint32_t **)uap->obj; 3462216641Sdavidxu int tocopy; 3463216641Sdavidxu int error = 0; 3464216641Sdavidxu int i, pos = 0; 3465216641Sdavidxu 3466216641Sdavidxu while (count > 0) { 3467216641Sdavidxu tocopy = count; 3468216641Sdavidxu if (tocopy > BATCH_SIZE) 3469216641Sdavidxu tocopy = BATCH_SIZE; 3470216641Sdavidxu error = copyin(upp+pos, uaddrs, tocopy * sizeof(uint32_t)); 3471216641Sdavidxu if (error != 0) 3472216641Sdavidxu break; 3473216641Sdavidxu for (i = 0; i < tocopy; ++i) 3474216641Sdavidxu kern_umtx_wake(td, (void *)(intptr_t)uaddrs[i], 3475216641Sdavidxu INT_MAX, 1); 3476216641Sdavidxu count -= tocopy; 3477216641Sdavidxu pos += tocopy; 3478216641Sdavidxu } 3479216641Sdavidxu return (error); 3480216641Sdavidxu} 3481216641Sdavidxu 3482162536Sdavidxustatic _umtx_op_func op_table_compat32[] = { 3483162536Sdavidxu __umtx_op_lock_umtx_compat32, /* UMTX_OP_LOCK */ 3484162536Sdavidxu __umtx_op_unlock_umtx_compat32, /* UMTX_OP_UNLOCK */ 3485162536Sdavidxu __umtx_op_wait_compat32, /* UMTX_OP_WAIT */ 3486162536Sdavidxu __umtx_op_wake, /* UMTX_OP_WAKE */ 3487162550Sdavidxu __umtx_op_trylock_umutex, /* UMTX_OP_MUTEX_LOCK */ 3488162536Sdavidxu __umtx_op_lock_umutex_compat32, /* UMTX_OP_MUTEX_TRYLOCK */ 3489162536Sdavidxu __umtx_op_unlock_umutex, /* UMTX_OP_MUTEX_UNLOCK */ 3490164839Sdavidxu __umtx_op_set_ceiling, /* UMTX_OP_SET_CEILING */ 3491164839Sdavidxu __umtx_op_cv_wait_compat32, /* UMTX_OP_CV_WAIT*/ 3492164839Sdavidxu __umtx_op_cv_signal, /* UMTX_OP_CV_SIGNAL */ 3493173800Sdavidxu __umtx_op_cv_broadcast, /* UMTX_OP_CV_BROADCAST */ 3494177848Sdavidxu __umtx_op_wait_compat32, /* UMTX_OP_WAIT_UINT */ 3495177848Sdavidxu __umtx_op_rw_rdlock_compat32, /* UMTX_OP_RW_RDLOCK */ 3496177848Sdavidxu __umtx_op_rw_wrlock_compat32, /* UMTX_OP_RW_WRLOCK */ 3497178646Sdavidxu __umtx_op_rw_unlock, /* UMTX_OP_RW_UNLOCK */ 3498178646Sdavidxu __umtx_op_wait_uint_private_compat32, /* UMTX_OP_WAIT_UINT_PRIVATE */ 3499179970Sdavidxu __umtx_op_wake_private, /* UMTX_OP_WAKE_PRIVATE */ 3500179970Sdavidxu __umtx_op_wait_umutex_compat32, /* UMTX_OP_UMUTEX_WAIT */ 3501201472Sdavidxu __umtx_op_wake_umutex, /* UMTX_OP_UMUTEX_WAKE */ 3502201472Sdavidxu __umtx_op_sem_wait_compat32, /* UMTX_OP_SEM_WAIT */ 3503216641Sdavidxu __umtx_op_sem_wake, /* UMTX_OP_SEM_WAKE */ 3504216641Sdavidxu __umtx_op_nwake_private32 /* UMTX_OP_NWAKE_PRIVATE */ 3505162536Sdavidxu}; 3506162536Sdavidxu 3507162536Sdavidxuint 3508162536Sdavidxufreebsd32_umtx_op(struct thread *td, struct freebsd32_umtx_op_args *uap) 3509162536Sdavidxu{ 3510163678Sdavidxu if ((unsigned)uap->op < UMTX_OP_MAX) 3511162536Sdavidxu return (*op_table_compat32[uap->op])(td, 3512162536Sdavidxu (struct _umtx_op_args *)uap); 3513162536Sdavidxu return (EINVAL); 3514162536Sdavidxu} 3515162536Sdavidxu#endif 3516162536Sdavidxu 3517161678Sdavidxuvoid 3518161678Sdavidxuumtx_thread_init(struct thread *td) 3519161678Sdavidxu{ 3520161678Sdavidxu td->td_umtxq = umtxq_alloc(); 3521161678Sdavidxu td->td_umtxq->uq_thread = td; 3522161678Sdavidxu} 3523161678Sdavidxu 3524161678Sdavidxuvoid 3525161678Sdavidxuumtx_thread_fini(struct thread *td) 3526161678Sdavidxu{ 3527161678Sdavidxu umtxq_free(td->td_umtxq); 3528161678Sdavidxu} 3529161678Sdavidxu 3530161678Sdavidxu/* 3531161678Sdavidxu * It will be called when new thread is created, e.g fork(). 3532161678Sdavidxu */ 3533161678Sdavidxuvoid 3534161678Sdavidxuumtx_thread_alloc(struct thread *td) 3535161678Sdavidxu{ 3536161678Sdavidxu struct umtx_q *uq; 3537161678Sdavidxu 3538161678Sdavidxu uq = td->td_umtxq; 3539161678Sdavidxu uq->uq_inherited_pri = PRI_MAX; 3540161678Sdavidxu 3541161678Sdavidxu KASSERT(uq->uq_flags == 0, ("uq_flags != 0")); 3542161678Sdavidxu KASSERT(uq->uq_thread == td, ("uq_thread != td")); 3543161678Sdavidxu KASSERT(uq->uq_pi_blocked == NULL, ("uq_pi_blocked != NULL")); 3544161678Sdavidxu KASSERT(TAILQ_EMPTY(&uq->uq_pi_contested), ("uq_pi_contested is not empty")); 3545161678Sdavidxu} 3546161678Sdavidxu 3547161678Sdavidxu/* 3548161678Sdavidxu * exec() hook. 3549161678Sdavidxu */ 3550161678Sdavidxustatic void 3551161678Sdavidxuumtx_exec_hook(void *arg __unused, struct proc *p __unused, 3552161678Sdavidxu struct image_params *imgp __unused) 3553161678Sdavidxu{ 3554161678Sdavidxu umtx_thread_cleanup(curthread); 3555161678Sdavidxu} 3556161678Sdavidxu 3557161678Sdavidxu/* 3558161678Sdavidxu * thread_exit() hook. 3559161678Sdavidxu */ 3560161678Sdavidxuvoid 3561161678Sdavidxuumtx_thread_exit(struct thread *td) 3562161678Sdavidxu{ 3563161678Sdavidxu umtx_thread_cleanup(td); 3564161678Sdavidxu} 3565161678Sdavidxu 3566161678Sdavidxu/* 3567161678Sdavidxu * clean up umtx data. 3568161678Sdavidxu */ 3569161678Sdavidxustatic void 3570161678Sdavidxuumtx_thread_cleanup(struct thread *td) 3571161678Sdavidxu{ 3572161678Sdavidxu struct umtx_q *uq; 3573161678Sdavidxu struct umtx_pi *pi; 3574161678Sdavidxu 3575161678Sdavidxu if ((uq = td->td_umtxq) == NULL) 3576161678Sdavidxu return; 3577161678Sdavidxu 3578170300Sjeff mtx_lock_spin(&umtx_lock); 3579161678Sdavidxu uq->uq_inherited_pri = PRI_MAX; 3580161678Sdavidxu while ((pi = TAILQ_FIRST(&uq->uq_pi_contested)) != NULL) { 3581161678Sdavidxu pi->pi_owner = NULL; 3582161678Sdavidxu TAILQ_REMOVE(&uq->uq_pi_contested, pi, pi_link); 3583161678Sdavidxu } 3584216313Sdavidxu mtx_unlock_spin(&umtx_lock); 3585174701Sdavidxu thread_lock(td); 3586216791Sdavidxu sched_lend_user_prio(td, PRI_MAX); 3587174701Sdavidxu thread_unlock(td); 3588161678Sdavidxu} 3589