kern_umtx.c revision 177849
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 177849 2008-04-02 04:26:59Z davidxu $"); 30116182Sobrien 31162536Sdavidxu#include "opt_compat.h" 32112904Sjeff#include <sys/param.h> 33112904Sjeff#include <sys/kernel.h> 34131431Smarcel#include <sys/limits.h> 35112904Sjeff#include <sys/lock.h> 36115765Sjeff#include <sys/malloc.h> 37112904Sjeff#include <sys/mutex.h> 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> 46139013Sdavidxu#include <sys/eventhandler.h> 47112904Sjeff#include <sys/umtx.h> 48112904Sjeff 49139013Sdavidxu#include <vm/vm.h> 50139013Sdavidxu#include <vm/vm_param.h> 51139013Sdavidxu#include <vm/pmap.h> 52139013Sdavidxu#include <vm/vm_map.h> 53139013Sdavidxu#include <vm/vm_object.h> 54139013Sdavidxu 55165369Sdavidxu#include <machine/cpu.h> 56165369Sdavidxu 57162536Sdavidxu#ifdef COMPAT_IA32 58162536Sdavidxu#include <compat/freebsd32/freebsd32_proto.h> 59162536Sdavidxu#endif 60162536Sdavidxu 61161678Sdavidxu#define TYPE_SIMPLE_LOCK 0 62161678Sdavidxu#define TYPE_SIMPLE_WAIT 1 63161678Sdavidxu#define TYPE_NORMAL_UMUTEX 2 64161678Sdavidxu#define TYPE_PI_UMUTEX 3 65161678Sdavidxu#define TYPE_PP_UMUTEX 4 66161678Sdavidxu#define TYPE_CV 5 67177848Sdavidxu#define TYPE_RWLOCK 6 68139013Sdavidxu 69161678Sdavidxu/* Key to represent a unique userland synchronous object */ 70139013Sdavidxustruct umtx_key { 71161678Sdavidxu int hash; 72139013Sdavidxu int type; 73161678Sdavidxu int shared; 74139013Sdavidxu union { 75139013Sdavidxu struct { 76139013Sdavidxu vm_object_t object; 77161678Sdavidxu uintptr_t offset; 78139013Sdavidxu } shared; 79139013Sdavidxu struct { 80161678Sdavidxu struct vmspace *vs; 81161678Sdavidxu uintptr_t addr; 82139013Sdavidxu } private; 83139013Sdavidxu struct { 84161678Sdavidxu void *a; 85161678Sdavidxu uintptr_t b; 86139013Sdavidxu } both; 87139013Sdavidxu } info; 88139013Sdavidxu}; 89139013Sdavidxu 90161678Sdavidxu/* Priority inheritance mutex info. */ 91161678Sdavidxustruct umtx_pi { 92161678Sdavidxu /* Owner thread */ 93161678Sdavidxu struct thread *pi_owner; 94161678Sdavidxu 95161678Sdavidxu /* Reference count */ 96161678Sdavidxu int pi_refcount; 97161678Sdavidxu 98161678Sdavidxu /* List entry to link umtx holding by thread */ 99161678Sdavidxu TAILQ_ENTRY(umtx_pi) pi_link; 100161678Sdavidxu 101161678Sdavidxu /* List entry in hash */ 102161678Sdavidxu TAILQ_ENTRY(umtx_pi) pi_hashlink; 103161678Sdavidxu 104161678Sdavidxu /* List for waiters */ 105161678Sdavidxu TAILQ_HEAD(,umtx_q) pi_blocked; 106161678Sdavidxu 107161678Sdavidxu /* Identify a userland lock object */ 108161678Sdavidxu struct umtx_key pi_key; 109161678Sdavidxu}; 110161678Sdavidxu 111161678Sdavidxu/* A userland synchronous object user. */ 112115765Sjeffstruct umtx_q { 113161678Sdavidxu /* Linked list for the hash. */ 114161678Sdavidxu TAILQ_ENTRY(umtx_q) uq_link; 115161678Sdavidxu 116161678Sdavidxu /* Umtx key. */ 117161678Sdavidxu struct umtx_key uq_key; 118161678Sdavidxu 119161678Sdavidxu /* Umtx flags. */ 120161678Sdavidxu int uq_flags; 121161678Sdavidxu#define UQF_UMTXQ 0x0001 122161678Sdavidxu 123161678Sdavidxu /* The thread waits on. */ 124161678Sdavidxu struct thread *uq_thread; 125161678Sdavidxu 126161678Sdavidxu /* 127161678Sdavidxu * Blocked on PI mutex. read can use chain lock 128170300Sjeff * or umtx_lock, write must have both chain lock and 129170300Sjeff * umtx_lock being hold. 130161678Sdavidxu */ 131161678Sdavidxu struct umtx_pi *uq_pi_blocked; 132161678Sdavidxu 133161678Sdavidxu /* On blocked list */ 134161678Sdavidxu TAILQ_ENTRY(umtx_q) uq_lockq; 135161678Sdavidxu 136161678Sdavidxu /* Thread contending with us */ 137161678Sdavidxu TAILQ_HEAD(,umtx_pi) uq_pi_contested; 138161678Sdavidxu 139161742Sdavidxu /* Inherited priority from PP mutex */ 140161678Sdavidxu u_char uq_inherited_pri; 141115765Sjeff}; 142115765Sjeff 143161678SdavidxuTAILQ_HEAD(umtxq_head, umtx_q); 144161678Sdavidxu 145161678Sdavidxu/* Userland lock object's wait-queue chain */ 146138224Sdavidxustruct umtxq_chain { 147161678Sdavidxu /* Lock for this chain. */ 148161678Sdavidxu struct mtx uc_lock; 149161678Sdavidxu 150161678Sdavidxu /* List of sleep queues. */ 151177848Sdavidxu struct umtxq_head uc_queue[2]; 152177848Sdavidxu#define UMTX_SHARED_QUEUE 0 153177848Sdavidxu#define UMTX_EXCLUSIVE_QUEUE 1 154161678Sdavidxu 155161678Sdavidxu /* Busy flag */ 156161678Sdavidxu char uc_busy; 157161678Sdavidxu 158161678Sdavidxu /* Chain lock waiters */ 159158377Sdavidxu int uc_waiters; 160161678Sdavidxu 161161678Sdavidxu /* All PI in the list */ 162161678Sdavidxu TAILQ_HEAD(,umtx_pi) uc_pi_list; 163138224Sdavidxu}; 164115765Sjeff 165161678Sdavidxu#define UMTXQ_LOCKED_ASSERT(uc) mtx_assert(&(uc)->uc_lock, MA_OWNED) 166161678Sdavidxu 167161678Sdavidxu/* 168161678Sdavidxu * Don't propagate time-sharing priority, there is a security reason, 169161678Sdavidxu * a user can simply introduce PI-mutex, let thread A lock the mutex, 170161678Sdavidxu * and let another thread B block on the mutex, because B is 171161678Sdavidxu * sleeping, its priority will be boosted, this causes A's priority to 172161678Sdavidxu * be boosted via priority propagating too and will never be lowered even 173161678Sdavidxu * if it is using 100%CPU, this is unfair to other processes. 174161678Sdavidxu */ 175161678Sdavidxu 176163709Sjb#define UPRI(td) (((td)->td_user_pri >= PRI_MIN_TIMESHARE &&\ 177163709Sjb (td)->td_user_pri <= PRI_MAX_TIMESHARE) ?\ 178163709Sjb PRI_MAX_TIMESHARE : (td)->td_user_pri) 179161678Sdavidxu 180138224Sdavidxu#define GOLDEN_RATIO_PRIME 2654404609U 181138224Sdavidxu#define UMTX_CHAINS 128 182138224Sdavidxu#define UMTX_SHIFTS (__WORD_BIT - 7) 183115765Sjeff 184161678Sdavidxu#define THREAD_SHARE 0 185161678Sdavidxu#define PROCESS_SHARE 1 186161678Sdavidxu#define AUTO_SHARE 2 187161678Sdavidxu 188161678Sdavidxu#define GET_SHARE(flags) \ 189161678Sdavidxu (((flags) & USYNC_PROCESS_SHARED) == 0 ? THREAD_SHARE : PROCESS_SHARE) 190161678Sdavidxu 191177848Sdavidxu#define BUSY_SPINS 200 192177848Sdavidxu 193161678Sdavidxustatic uma_zone_t umtx_pi_zone; 194161678Sdavidxustatic struct umtxq_chain umtxq_chains[UMTX_CHAINS]; 195138224Sdavidxustatic MALLOC_DEFINE(M_UMTX, "umtx", "UMTX queue memory"); 196161678Sdavidxustatic int umtx_pi_allocated; 197115310Sjeff 198161678SdavidxuSYSCTL_NODE(_debug, OID_AUTO, umtx, CTLFLAG_RW, 0, "umtx debug"); 199161678SdavidxuSYSCTL_INT(_debug_umtx, OID_AUTO, umtx_pi_allocated, CTLFLAG_RD, 200161678Sdavidxu &umtx_pi_allocated, 0, "Allocated umtx_pi"); 201161678Sdavidxu 202161678Sdavidxustatic void umtxq_sysinit(void *); 203161678Sdavidxustatic void umtxq_hash(struct umtx_key *key); 204161678Sdavidxustatic struct umtxq_chain *umtxq_getchain(struct umtx_key *key); 205139013Sdavidxustatic void umtxq_lock(struct umtx_key *key); 206139013Sdavidxustatic void umtxq_unlock(struct umtx_key *key); 207139257Sdavidxustatic void umtxq_busy(struct umtx_key *key); 208139257Sdavidxustatic void umtxq_unbusy(struct umtx_key *key); 209177848Sdavidxustatic void umtxq_insert_queue(struct umtx_q *uq, int q); 210177848Sdavidxustatic void umtxq_remove_queue(struct umtx_q *uq, int q); 211161678Sdavidxustatic int umtxq_sleep(struct umtx_q *uq, const char *wmesg, int timo); 212139257Sdavidxustatic int umtxq_count(struct umtx_key *key); 213139013Sdavidxustatic int umtx_key_match(const struct umtx_key *k1, const struct umtx_key *k2); 214161678Sdavidxustatic int umtx_key_get(void *addr, int type, int share, 215139013Sdavidxu struct umtx_key *key); 216139013Sdavidxustatic void umtx_key_release(struct umtx_key *key); 217163697Sdavidxustatic struct umtx_pi *umtx_pi_alloc(int); 218161678Sdavidxustatic void umtx_pi_free(struct umtx_pi *pi); 219174701Sdavidxustatic void umtx_pi_adjust_locked(struct thread *td, u_char oldpri); 220161678Sdavidxustatic int do_unlock_pp(struct thread *td, struct umutex *m, uint32_t flags); 221161678Sdavidxustatic void umtx_thread_cleanup(struct thread *td); 222161678Sdavidxustatic void umtx_exec_hook(void *arg __unused, struct proc *p __unused, 223161678Sdavidxu struct image_params *imgp __unused); 224161678SdavidxuSYSINIT(umtx, SI_SUB_EVENTHANDLER+1, SI_ORDER_MIDDLE, umtxq_sysinit, NULL); 225115310Sjeff 226177848Sdavidxu#define umtxq_signal(key, nwake) umtxq_signal_queue((key), (nwake), UMTX_SHARED_QUEUE) 227177848Sdavidxu#define umtxq_insert(uq) umtxq_insert_queue((uq), UMTX_SHARED_QUEUE) 228177848Sdavidxu#define umtxq_remove(uq) umtxq_remove_queue((uq), UMTX_SHARED_QUEUE) 229177848Sdavidxu 230170300Sjeffstatic struct mtx umtx_lock; 231170300Sjeff 232161678Sdavidxustatic void 233161678Sdavidxuumtxq_sysinit(void *arg __unused) 234161678Sdavidxu{ 235161678Sdavidxu int i; 236138224Sdavidxu 237161678Sdavidxu umtx_pi_zone = uma_zcreate("umtx pi", sizeof(struct umtx_pi), 238161678Sdavidxu NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 239161678Sdavidxu for (i = 0; i < UMTX_CHAINS; ++i) { 240161678Sdavidxu mtx_init(&umtxq_chains[i].uc_lock, "umtxql", NULL, 241161678Sdavidxu MTX_DEF | MTX_DUPOK); 242177848Sdavidxu TAILQ_INIT(&umtxq_chains[i].uc_queue[0]); 243177848Sdavidxu TAILQ_INIT(&umtxq_chains[i].uc_queue[1]); 244161678Sdavidxu TAILQ_INIT(&umtxq_chains[i].uc_pi_list); 245161678Sdavidxu umtxq_chains[i].uc_busy = 0; 246161678Sdavidxu umtxq_chains[i].uc_waiters = 0; 247161678Sdavidxu } 248170300Sjeff mtx_init(&umtx_lock, "umtx lock", NULL, MTX_SPIN); 249161678Sdavidxu EVENTHANDLER_REGISTER(process_exec, umtx_exec_hook, NULL, 250161678Sdavidxu EVENTHANDLER_PRI_ANY); 251161678Sdavidxu} 252161678Sdavidxu 253143149Sdavidxustruct umtx_q * 254143149Sdavidxuumtxq_alloc(void) 255143149Sdavidxu{ 256161678Sdavidxu struct umtx_q *uq; 257161678Sdavidxu 258161678Sdavidxu uq = malloc(sizeof(struct umtx_q), M_UMTX, M_WAITOK | M_ZERO); 259161678Sdavidxu TAILQ_INIT(&uq->uq_pi_contested); 260161678Sdavidxu uq->uq_inherited_pri = PRI_MAX; 261161678Sdavidxu return (uq); 262143149Sdavidxu} 263143149Sdavidxu 264143149Sdavidxuvoid 265143149Sdavidxuumtxq_free(struct umtx_q *uq) 266143149Sdavidxu{ 267143149Sdavidxu free(uq, M_UMTX); 268143149Sdavidxu} 269143149Sdavidxu 270161678Sdavidxustatic inline void 271139013Sdavidxuumtxq_hash(struct umtx_key *key) 272138224Sdavidxu{ 273161678Sdavidxu unsigned n = (uintptr_t)key->info.both.a + key->info.both.b; 274161678Sdavidxu key->hash = ((n * GOLDEN_RATIO_PRIME) >> UMTX_SHIFTS) % UMTX_CHAINS; 275138224Sdavidxu} 276138224Sdavidxu 277139013Sdavidxustatic inline int 278139013Sdavidxuumtx_key_match(const struct umtx_key *k1, const struct umtx_key *k2) 279139013Sdavidxu{ 280139013Sdavidxu return (k1->type == k2->type && 281161678Sdavidxu k1->info.both.a == k2->info.both.a && 282161678Sdavidxu k1->info.both.b == k2->info.both.b); 283139013Sdavidxu} 284139013Sdavidxu 285161678Sdavidxustatic inline struct umtxq_chain * 286161678Sdavidxuumtxq_getchain(struct umtx_key *key) 287139013Sdavidxu{ 288161678Sdavidxu return (&umtxq_chains[key->hash]); 289139013Sdavidxu} 290139013Sdavidxu 291161678Sdavidxu/* 292177848Sdavidxu * Lock a chain. 293161678Sdavidxu */ 294138224Sdavidxustatic inline void 295177848Sdavidxuumtxq_lock(struct umtx_key *key) 296139257Sdavidxu{ 297161678Sdavidxu struct umtxq_chain *uc; 298139257Sdavidxu 299161678Sdavidxu uc = umtxq_getchain(key); 300177848Sdavidxu mtx_lock(&uc->uc_lock); 301139257Sdavidxu} 302139257Sdavidxu 303161678Sdavidxu/* 304177848Sdavidxu * Unlock a chain. 305161678Sdavidxu */ 306139257Sdavidxustatic inline void 307177848Sdavidxuumtxq_unlock(struct umtx_key *key) 308139257Sdavidxu{ 309161678Sdavidxu struct umtxq_chain *uc; 310139257Sdavidxu 311161678Sdavidxu uc = umtxq_getchain(key); 312177848Sdavidxu mtx_unlock(&uc->uc_lock); 313139257Sdavidxu} 314139257Sdavidxu 315161678Sdavidxu/* 316177848Sdavidxu * Set chain to busy state when following operation 317177848Sdavidxu * may be blocked (kernel mutex can not be used). 318161678Sdavidxu */ 319139257Sdavidxustatic inline void 320177848Sdavidxuumtxq_busy(struct umtx_key *key) 321138224Sdavidxu{ 322161678Sdavidxu struct umtxq_chain *uc; 323161678Sdavidxu 324161678Sdavidxu uc = umtxq_getchain(key); 325177848Sdavidxu mtx_assert(&uc->uc_lock, MA_OWNED); 326177848Sdavidxu if (uc->uc_busy) { 327177848Sdavidxu int count = BUSY_SPINS; 328177848Sdavidxu if (count > 0) { 329177848Sdavidxu umtxq_unlock(key); 330177848Sdavidxu while (uc->uc_busy && --count > 0) 331177848Sdavidxu cpu_spinwait(); 332177848Sdavidxu umtxq_lock(key); 333177848Sdavidxu } 334177848Sdavidxu while (uc->uc_busy != 0) { 335177848Sdavidxu uc->uc_waiters++; 336177848Sdavidxu msleep(uc, &uc->uc_lock, 0, "umtxqb", 0); 337177848Sdavidxu uc->uc_waiters--; 338177848Sdavidxu } 339177848Sdavidxu } 340177848Sdavidxu uc->uc_busy = 1; 341138224Sdavidxu} 342138224Sdavidxu 343161678Sdavidxu/* 344177848Sdavidxu * Unbusy a chain. 345161678Sdavidxu */ 346138225Sdavidxustatic inline void 347177848Sdavidxuumtxq_unbusy(struct umtx_key *key) 348138224Sdavidxu{ 349161678Sdavidxu struct umtxq_chain *uc; 350161678Sdavidxu 351161678Sdavidxu uc = umtxq_getchain(key); 352177848Sdavidxu mtx_assert(&uc->uc_lock, MA_OWNED); 353177848Sdavidxu KASSERT(uc->uc_busy != 0, ("not busy")); 354177848Sdavidxu uc->uc_busy = 0; 355177848Sdavidxu if (uc->uc_waiters) 356177848Sdavidxu wakeup_one(uc); 357138224Sdavidxu} 358138224Sdavidxu 359139013Sdavidxustatic inline void 360177848Sdavidxuumtxq_insert_queue(struct umtx_q *uq, int q) 361115765Sjeff{ 362161678Sdavidxu struct umtxq_chain *uc; 363139013Sdavidxu 364161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 365161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 366177848Sdavidxu TAILQ_INSERT_TAIL(&uc->uc_queue[q], uq, uq_link); 367158718Sdavidxu uq->uq_flags |= UQF_UMTXQ; 368139013Sdavidxu} 369139013Sdavidxu 370139013Sdavidxustatic inline void 371177848Sdavidxuumtxq_remove_queue(struct umtx_q *uq, int q) 372139013Sdavidxu{ 373161678Sdavidxu struct umtxq_chain *uc; 374161678Sdavidxu 375161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 376161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 377158718Sdavidxu if (uq->uq_flags & UQF_UMTXQ) { 378177848Sdavidxu TAILQ_REMOVE(&uc->uc_queue[q], uq, uq_link); 379158718Sdavidxu uq->uq_flags &= ~UQF_UMTXQ; 380139013Sdavidxu } 381139013Sdavidxu} 382139013Sdavidxu 383161678Sdavidxu/* 384161678Sdavidxu * Check if there are multiple waiters 385161678Sdavidxu */ 386139013Sdavidxustatic int 387139013Sdavidxuumtxq_count(struct umtx_key *key) 388139013Sdavidxu{ 389161678Sdavidxu struct umtxq_chain *uc; 390115765Sjeff struct umtx_q *uq; 391161678Sdavidxu int count = 0; 392115765Sjeff 393161678Sdavidxu uc = umtxq_getchain(key); 394161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 395177848Sdavidxu TAILQ_FOREACH(uq, &uc->uc_queue[UMTX_SHARED_QUEUE], uq_link) { 396139013Sdavidxu if (umtx_key_match(&uq->uq_key, key)) { 397139013Sdavidxu if (++count > 1) 398139013Sdavidxu break; 399139013Sdavidxu } 400115765Sjeff } 401139013Sdavidxu return (count); 402115765Sjeff} 403115765Sjeff 404161678Sdavidxu/* 405161678Sdavidxu * Check if there are multiple PI waiters and returns first 406161678Sdavidxu * waiter. 407161678Sdavidxu */ 408139257Sdavidxustatic int 409161678Sdavidxuumtxq_count_pi(struct umtx_key *key, struct umtx_q **first) 410161678Sdavidxu{ 411161678Sdavidxu struct umtxq_chain *uc; 412161678Sdavidxu struct umtx_q *uq; 413161678Sdavidxu int count = 0; 414161678Sdavidxu 415161678Sdavidxu *first = NULL; 416161678Sdavidxu uc = umtxq_getchain(key); 417161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 418177848Sdavidxu TAILQ_FOREACH(uq, &uc->uc_queue[UMTX_SHARED_QUEUE], uq_link) { 419161678Sdavidxu if (umtx_key_match(&uq->uq_key, key)) { 420161678Sdavidxu if (++count > 1) 421161678Sdavidxu break; 422161678Sdavidxu *first = uq; 423161678Sdavidxu } 424161678Sdavidxu } 425161678Sdavidxu return (count); 426161678Sdavidxu} 427161678Sdavidxu 428161678Sdavidxu/* 429161678Sdavidxu * Wake up threads waiting on an userland object. 430161678Sdavidxu */ 431177848Sdavidxu 432161678Sdavidxustatic int 433177848Sdavidxuumtxq_signal_queue(struct umtx_key *key, int n_wake, int q) 434115765Sjeff{ 435161678Sdavidxu struct umtxq_chain *uc; 436139257Sdavidxu struct umtx_q *uq, *next; 437161678Sdavidxu int ret; 438115765Sjeff 439139257Sdavidxu ret = 0; 440161678Sdavidxu uc = umtxq_getchain(key); 441161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 442177848Sdavidxu TAILQ_FOREACH_SAFE(uq, &uc->uc_queue[q], uq_link, next) { 443139013Sdavidxu if (umtx_key_match(&uq->uq_key, key)) { 444177848Sdavidxu umtxq_remove_queue(uq, q); 445161678Sdavidxu wakeup(uq); 446139257Sdavidxu if (++ret >= n_wake) 447139257Sdavidxu break; 448139013Sdavidxu } 449139013Sdavidxu } 450139257Sdavidxu return (ret); 451138224Sdavidxu} 452138224Sdavidxu 453177848Sdavidxu 454161678Sdavidxu/* 455161678Sdavidxu * Wake up specified thread. 456161678Sdavidxu */ 457161678Sdavidxustatic inline void 458161678Sdavidxuumtxq_signal_thread(struct umtx_q *uq) 459161678Sdavidxu{ 460161678Sdavidxu struct umtxq_chain *uc; 461161678Sdavidxu 462161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 463161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 464161678Sdavidxu umtxq_remove(uq); 465161678Sdavidxu wakeup(uq); 466161678Sdavidxu} 467161678Sdavidxu 468161678Sdavidxu/* 469161678Sdavidxu * Put thread into sleep state, before sleeping, check if 470161678Sdavidxu * thread was removed from umtx queue. 471161678Sdavidxu */ 472138224Sdavidxustatic inline int 473161678Sdavidxuumtxq_sleep(struct umtx_q *uq, const char *wmesg, int timo) 474138224Sdavidxu{ 475161678Sdavidxu struct umtxq_chain *uc; 476161678Sdavidxu int error; 477161678Sdavidxu 478161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 479161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 480161678Sdavidxu if (!(uq->uq_flags & UQF_UMTXQ)) 481161678Sdavidxu return (0); 482161678Sdavidxu error = msleep(uq, &uc->uc_lock, PCATCH, wmesg, timo); 483139751Sdavidxu if (error == EWOULDBLOCK) 484139751Sdavidxu error = ETIMEDOUT; 485139751Sdavidxu return (error); 486138224Sdavidxu} 487138224Sdavidxu 488161678Sdavidxu/* 489161678Sdavidxu * Convert userspace address into unique logical address. 490161678Sdavidxu */ 491139013Sdavidxustatic int 492161678Sdavidxuumtx_key_get(void *addr, int type, int share, struct umtx_key *key) 493139013Sdavidxu{ 494161678Sdavidxu struct thread *td = curthread; 495139013Sdavidxu vm_map_t map; 496139013Sdavidxu vm_map_entry_t entry; 497139013Sdavidxu vm_pindex_t pindex; 498139013Sdavidxu vm_prot_t prot; 499139013Sdavidxu boolean_t wired; 500139013Sdavidxu 501161678Sdavidxu key->type = type; 502161678Sdavidxu if (share == THREAD_SHARE) { 503161678Sdavidxu key->shared = 0; 504161678Sdavidxu key->info.private.vs = td->td_proc->p_vmspace; 505161678Sdavidxu key->info.private.addr = (uintptr_t)addr; 506163677Sdavidxu } else { 507163677Sdavidxu MPASS(share == PROCESS_SHARE || share == AUTO_SHARE); 508161678Sdavidxu map = &td->td_proc->p_vmspace->vm_map; 509161678Sdavidxu if (vm_map_lookup(&map, (vm_offset_t)addr, VM_PROT_WRITE, 510161678Sdavidxu &entry, &key->info.shared.object, &pindex, &prot, 511161678Sdavidxu &wired) != KERN_SUCCESS) { 512161678Sdavidxu return EFAULT; 513161678Sdavidxu } 514161678Sdavidxu 515161678Sdavidxu if ((share == PROCESS_SHARE) || 516161678Sdavidxu (share == AUTO_SHARE && 517161678Sdavidxu VM_INHERIT_SHARE == entry->inheritance)) { 518161678Sdavidxu key->shared = 1; 519161678Sdavidxu key->info.shared.offset = entry->offset + entry->start - 520161678Sdavidxu (vm_offset_t)addr; 521161678Sdavidxu vm_object_reference(key->info.shared.object); 522161678Sdavidxu } else { 523161678Sdavidxu key->shared = 0; 524161678Sdavidxu key->info.private.vs = td->td_proc->p_vmspace; 525161678Sdavidxu key->info.private.addr = (uintptr_t)addr; 526161678Sdavidxu } 527161678Sdavidxu vm_map_lookup_done(map, entry); 528139013Sdavidxu } 529139013Sdavidxu 530161678Sdavidxu umtxq_hash(key); 531139013Sdavidxu return (0); 532139013Sdavidxu} 533139013Sdavidxu 534161678Sdavidxu/* 535161678Sdavidxu * Release key. 536161678Sdavidxu */ 537139013Sdavidxustatic inline void 538139013Sdavidxuumtx_key_release(struct umtx_key *key) 539139013Sdavidxu{ 540161678Sdavidxu if (key->shared) 541139013Sdavidxu vm_object_deallocate(key->info.shared.object); 542139013Sdavidxu} 543139013Sdavidxu 544161678Sdavidxu/* 545161678Sdavidxu * Lock a umtx object. 546161678Sdavidxu */ 547139013Sdavidxustatic int 548163449Sdavidxu_do_lock_umtx(struct thread *td, struct umtx *umtx, u_long id, int timo) 549112904Sjeff{ 550143149Sdavidxu struct umtx_q *uq; 551163449Sdavidxu u_long owner; 552163449Sdavidxu u_long old; 553138224Sdavidxu int error = 0; 554112904Sjeff 555143149Sdavidxu uq = td->td_umtxq; 556161678Sdavidxu 557112904Sjeff /* 558161678Sdavidxu * Care must be exercised when dealing with umtx structure. It 559112904Sjeff * can fault on any access. 560112904Sjeff */ 561112904Sjeff for (;;) { 562112904Sjeff /* 563112904Sjeff * Try the uncontested case. This should be done in userland. 564112904Sjeff */ 565163449Sdavidxu owner = casuword(&umtx->u_owner, UMTX_UNOWNED, id); 566112904Sjeff 567138224Sdavidxu /* The acquire succeeded. */ 568138224Sdavidxu if (owner == UMTX_UNOWNED) 569138224Sdavidxu return (0); 570138224Sdavidxu 571115765Sjeff /* The address was invalid. */ 572115765Sjeff if (owner == -1) 573115765Sjeff return (EFAULT); 574115765Sjeff 575115765Sjeff /* If no one owns it but it is contested try to acquire it. */ 576115765Sjeff if (owner == UMTX_CONTESTED) { 577163449Sdavidxu owner = casuword(&umtx->u_owner, 578139013Sdavidxu UMTX_CONTESTED, id | UMTX_CONTESTED); 579115765Sjeff 580138224Sdavidxu if (owner == UMTX_CONTESTED) 581138224Sdavidxu return (0); 582138224Sdavidxu 583115765Sjeff /* The address was invalid. */ 584115765Sjeff if (owner == -1) 585115765Sjeff return (EFAULT); 586115765Sjeff 587115765Sjeff /* If this failed the lock has changed, restart. */ 588115765Sjeff continue; 589112904Sjeff } 590112904Sjeff 591138224Sdavidxu /* 592138224Sdavidxu * If we caught a signal, we have retried and now 593138224Sdavidxu * exit immediately. 594138224Sdavidxu */ 595161678Sdavidxu if (error != 0) 596138224Sdavidxu return (error); 597112904Sjeff 598161678Sdavidxu if ((error = umtx_key_get(umtx, TYPE_SIMPLE_LOCK, 599161678Sdavidxu AUTO_SHARE, &uq->uq_key)) != 0) 600161678Sdavidxu return (error); 601161678Sdavidxu 602161678Sdavidxu umtxq_lock(&uq->uq_key); 603161678Sdavidxu umtxq_busy(&uq->uq_key); 604161678Sdavidxu umtxq_insert(uq); 605161678Sdavidxu umtxq_unbusy(&uq->uq_key); 606161678Sdavidxu umtxq_unlock(&uq->uq_key); 607161678Sdavidxu 608112904Sjeff /* 609112904Sjeff * Set the contested bit so that a release in user space 610112904Sjeff * knows to use the system call for unlock. If this fails 611112904Sjeff * either some one else has acquired the lock or it has been 612112904Sjeff * released. 613112904Sjeff */ 614163449Sdavidxu old = casuword(&umtx->u_owner, owner, owner | UMTX_CONTESTED); 615112904Sjeff 616112904Sjeff /* The address was invalid. */ 617112967Sjake if (old == -1) { 618143149Sdavidxu umtxq_lock(&uq->uq_key); 619143149Sdavidxu umtxq_remove(uq); 620143149Sdavidxu umtxq_unlock(&uq->uq_key); 621143149Sdavidxu umtx_key_release(&uq->uq_key); 622115765Sjeff return (EFAULT); 623112904Sjeff } 624112904Sjeff 625112904Sjeff /* 626115765Sjeff * We set the contested bit, sleep. Otherwise the lock changed 627117685Smtm * and we need to retry or we lost a race to the thread 628117685Smtm * unlocking the umtx. 629112904Sjeff */ 630143149Sdavidxu umtxq_lock(&uq->uq_key); 631161678Sdavidxu if (old == owner) 632161678Sdavidxu error = umtxq_sleep(uq, "umtx", timo); 633143149Sdavidxu umtxq_remove(uq); 634143149Sdavidxu umtxq_unlock(&uq->uq_key); 635143149Sdavidxu umtx_key_release(&uq->uq_key); 636112904Sjeff } 637117743Smtm 638117743Smtm return (0); 639112904Sjeff} 640112904Sjeff 641161678Sdavidxu/* 642161678Sdavidxu * Lock a umtx object. 643161678Sdavidxu */ 644139013Sdavidxustatic int 645163449Sdavidxudo_lock_umtx(struct thread *td, struct umtx *umtx, u_long id, 646140245Sdavidxu struct timespec *timeout) 647112904Sjeff{ 648140245Sdavidxu struct timespec ts, ts2, ts3; 649139013Sdavidxu struct timeval tv; 650140245Sdavidxu int error; 651139013Sdavidxu 652140245Sdavidxu if (timeout == NULL) { 653162536Sdavidxu error = _do_lock_umtx(td, umtx, id, 0); 654162030Sdavidxu /* Mutex locking is restarted if it is interrupted. */ 655162030Sdavidxu if (error == EINTR) 656162030Sdavidxu error = ERESTART; 657139013Sdavidxu } else { 658140245Sdavidxu getnanouptime(&ts); 659140245Sdavidxu timespecadd(&ts, timeout); 660140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 661139013Sdavidxu for (;;) { 662162536Sdavidxu error = _do_lock_umtx(td, umtx, id, tvtohz(&tv)); 663140245Sdavidxu if (error != ETIMEDOUT) 664140245Sdavidxu break; 665140245Sdavidxu getnanouptime(&ts2); 666140245Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 667139751Sdavidxu error = ETIMEDOUT; 668139013Sdavidxu break; 669139013Sdavidxu } 670140245Sdavidxu ts3 = ts; 671140245Sdavidxu timespecsub(&ts3, &ts2); 672140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 673139013Sdavidxu } 674162030Sdavidxu /* Timed-locking is not restarted. */ 675162030Sdavidxu if (error == ERESTART) 676162030Sdavidxu error = EINTR; 677139013Sdavidxu } 678139013Sdavidxu return (error); 679139013Sdavidxu} 680139013Sdavidxu 681161678Sdavidxu/* 682161678Sdavidxu * Unlock a umtx object. 683161678Sdavidxu */ 684139013Sdavidxustatic int 685163449Sdavidxudo_unlock_umtx(struct thread *td, struct umtx *umtx, u_long id) 686139013Sdavidxu{ 687139013Sdavidxu struct umtx_key key; 688163449Sdavidxu u_long owner; 689163449Sdavidxu u_long old; 690139257Sdavidxu int error; 691139257Sdavidxu int count; 692112904Sjeff 693112904Sjeff /* 694112904Sjeff * Make sure we own this mtx. 695112904Sjeff */ 696163449Sdavidxu owner = fuword(__DEVOLATILE(u_long *, &umtx->u_owner)); 697161678Sdavidxu if (owner == -1) 698115765Sjeff return (EFAULT); 699115765Sjeff 700139013Sdavidxu if ((owner & ~UMTX_CONTESTED) != id) 701115765Sjeff return (EPERM); 702112904Sjeff 703161678Sdavidxu /* This should be done in userland */ 704161678Sdavidxu if ((owner & UMTX_CONTESTED) == 0) { 705163449Sdavidxu old = casuword(&umtx->u_owner, owner, UMTX_UNOWNED); 706161678Sdavidxu if (old == -1) 707161678Sdavidxu return (EFAULT); 708161678Sdavidxu if (old == owner) 709161678Sdavidxu return (0); 710161855Sdavidxu owner = old; 711161678Sdavidxu } 712161678Sdavidxu 713117685Smtm /* We should only ever be in here for contested locks */ 714161678Sdavidxu if ((error = umtx_key_get(umtx, TYPE_SIMPLE_LOCK, AUTO_SHARE, 715161678Sdavidxu &key)) != 0) 716139257Sdavidxu return (error); 717139257Sdavidxu 718139257Sdavidxu umtxq_lock(&key); 719139257Sdavidxu umtxq_busy(&key); 720139257Sdavidxu count = umtxq_count(&key); 721139257Sdavidxu umtxq_unlock(&key); 722139257Sdavidxu 723117743Smtm /* 724117743Smtm * When unlocking the umtx, it must be marked as unowned if 725117743Smtm * there is zero or one thread only waiting for it. 726117743Smtm * Otherwise, it must be marked as contested. 727117743Smtm */ 728163449Sdavidxu old = casuword(&umtx->u_owner, owner, 729163449Sdavidxu count <= 1 ? UMTX_UNOWNED : UMTX_CONTESTED); 730139257Sdavidxu umtxq_lock(&key); 731161678Sdavidxu umtxq_signal(&key,1); 732139257Sdavidxu umtxq_unbusy(&key); 733139257Sdavidxu umtxq_unlock(&key); 734139257Sdavidxu umtx_key_release(&key); 735115765Sjeff if (old == -1) 736115765Sjeff return (EFAULT); 737138224Sdavidxu if (old != owner) 738138224Sdavidxu return (EINVAL); 739115765Sjeff return (0); 740112904Sjeff} 741139013Sdavidxu 742162536Sdavidxu#ifdef COMPAT_IA32 743162536Sdavidxu 744161678Sdavidxu/* 745162536Sdavidxu * Lock a umtx object. 746162536Sdavidxu */ 747162536Sdavidxustatic int 748162536Sdavidxu_do_lock_umtx32(struct thread *td, uint32_t *m, uint32_t id, int timo) 749162536Sdavidxu{ 750162536Sdavidxu struct umtx_q *uq; 751162536Sdavidxu uint32_t owner; 752162536Sdavidxu uint32_t old; 753162536Sdavidxu int error = 0; 754162536Sdavidxu 755162536Sdavidxu uq = td->td_umtxq; 756162536Sdavidxu 757162536Sdavidxu /* 758162536Sdavidxu * Care must be exercised when dealing with umtx structure. It 759162536Sdavidxu * can fault on any access. 760162536Sdavidxu */ 761162536Sdavidxu for (;;) { 762162536Sdavidxu /* 763162536Sdavidxu * Try the uncontested case. This should be done in userland. 764162536Sdavidxu */ 765162536Sdavidxu owner = casuword32(m, UMUTEX_UNOWNED, id); 766162536Sdavidxu 767162536Sdavidxu /* The acquire succeeded. */ 768162536Sdavidxu if (owner == UMUTEX_UNOWNED) 769162536Sdavidxu return (0); 770162536Sdavidxu 771162536Sdavidxu /* The address was invalid. */ 772162536Sdavidxu if (owner == -1) 773162536Sdavidxu return (EFAULT); 774162536Sdavidxu 775162536Sdavidxu /* If no one owns it but it is contested try to acquire it. */ 776162536Sdavidxu if (owner == UMUTEX_CONTESTED) { 777162536Sdavidxu owner = casuword32(m, 778162536Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 779162536Sdavidxu if (owner == UMUTEX_CONTESTED) 780162536Sdavidxu return (0); 781162536Sdavidxu 782162536Sdavidxu /* The address was invalid. */ 783162536Sdavidxu if (owner == -1) 784162536Sdavidxu return (EFAULT); 785162536Sdavidxu 786162536Sdavidxu /* If this failed the lock has changed, restart. */ 787162536Sdavidxu continue; 788162536Sdavidxu } 789162536Sdavidxu 790162536Sdavidxu /* 791162536Sdavidxu * If we caught a signal, we have retried and now 792162536Sdavidxu * exit immediately. 793162536Sdavidxu */ 794162536Sdavidxu if (error != 0) 795162536Sdavidxu return (error); 796162536Sdavidxu 797162536Sdavidxu if ((error = umtx_key_get(m, TYPE_SIMPLE_LOCK, 798162536Sdavidxu AUTO_SHARE, &uq->uq_key)) != 0) 799162536Sdavidxu return (error); 800162536Sdavidxu 801162536Sdavidxu umtxq_lock(&uq->uq_key); 802162536Sdavidxu umtxq_busy(&uq->uq_key); 803162536Sdavidxu umtxq_insert(uq); 804162536Sdavidxu umtxq_unbusy(&uq->uq_key); 805162536Sdavidxu umtxq_unlock(&uq->uq_key); 806162536Sdavidxu 807162536Sdavidxu /* 808162536Sdavidxu * Set the contested bit so that a release in user space 809162536Sdavidxu * knows to use the system call for unlock. If this fails 810162536Sdavidxu * either some one else has acquired the lock or it has been 811162536Sdavidxu * released. 812162536Sdavidxu */ 813162536Sdavidxu old = casuword32(m, owner, owner | UMUTEX_CONTESTED); 814162536Sdavidxu 815162536Sdavidxu /* The address was invalid. */ 816162536Sdavidxu if (old == -1) { 817162536Sdavidxu umtxq_lock(&uq->uq_key); 818162536Sdavidxu umtxq_remove(uq); 819162536Sdavidxu umtxq_unlock(&uq->uq_key); 820162536Sdavidxu umtx_key_release(&uq->uq_key); 821162536Sdavidxu return (EFAULT); 822162536Sdavidxu } 823162536Sdavidxu 824162536Sdavidxu /* 825162536Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 826162536Sdavidxu * and we need to retry or we lost a race to the thread 827162536Sdavidxu * unlocking the umtx. 828162536Sdavidxu */ 829162536Sdavidxu umtxq_lock(&uq->uq_key); 830162536Sdavidxu if (old == owner) 831162536Sdavidxu error = umtxq_sleep(uq, "umtx", timo); 832162536Sdavidxu umtxq_remove(uq); 833162536Sdavidxu umtxq_unlock(&uq->uq_key); 834162536Sdavidxu umtx_key_release(&uq->uq_key); 835162536Sdavidxu } 836162536Sdavidxu 837162536Sdavidxu return (0); 838162536Sdavidxu} 839162536Sdavidxu 840162536Sdavidxu/* 841162536Sdavidxu * Lock a umtx object. 842162536Sdavidxu */ 843162536Sdavidxustatic int 844162536Sdavidxudo_lock_umtx32(struct thread *td, void *m, uint32_t id, 845162536Sdavidxu struct timespec *timeout) 846162536Sdavidxu{ 847162536Sdavidxu struct timespec ts, ts2, ts3; 848162536Sdavidxu struct timeval tv; 849162536Sdavidxu int error; 850162536Sdavidxu 851162536Sdavidxu if (timeout == NULL) { 852162536Sdavidxu error = _do_lock_umtx32(td, m, id, 0); 853162536Sdavidxu /* Mutex locking is restarted if it is interrupted. */ 854162536Sdavidxu if (error == EINTR) 855162536Sdavidxu error = ERESTART; 856162536Sdavidxu } else { 857162536Sdavidxu getnanouptime(&ts); 858162536Sdavidxu timespecadd(&ts, timeout); 859162536Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 860162536Sdavidxu for (;;) { 861162536Sdavidxu error = _do_lock_umtx32(td, m, id, tvtohz(&tv)); 862162536Sdavidxu if (error != ETIMEDOUT) 863162536Sdavidxu break; 864162536Sdavidxu getnanouptime(&ts2); 865162536Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 866162536Sdavidxu error = ETIMEDOUT; 867162536Sdavidxu break; 868162536Sdavidxu } 869162536Sdavidxu ts3 = ts; 870162536Sdavidxu timespecsub(&ts3, &ts2); 871162536Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 872162536Sdavidxu } 873162536Sdavidxu /* Timed-locking is not restarted. */ 874162536Sdavidxu if (error == ERESTART) 875162536Sdavidxu error = EINTR; 876162536Sdavidxu } 877162536Sdavidxu return (error); 878162536Sdavidxu} 879162536Sdavidxu 880162536Sdavidxu/* 881162536Sdavidxu * Unlock a umtx object. 882162536Sdavidxu */ 883162536Sdavidxustatic int 884162536Sdavidxudo_unlock_umtx32(struct thread *td, uint32_t *m, uint32_t id) 885162536Sdavidxu{ 886162536Sdavidxu struct umtx_key key; 887162536Sdavidxu uint32_t owner; 888162536Sdavidxu uint32_t old; 889162536Sdavidxu int error; 890162536Sdavidxu int count; 891162536Sdavidxu 892162536Sdavidxu /* 893162536Sdavidxu * Make sure we own this mtx. 894162536Sdavidxu */ 895162536Sdavidxu owner = fuword32(m); 896162536Sdavidxu if (owner == -1) 897162536Sdavidxu return (EFAULT); 898162536Sdavidxu 899162536Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 900162536Sdavidxu return (EPERM); 901162536Sdavidxu 902162536Sdavidxu /* This should be done in userland */ 903162536Sdavidxu if ((owner & UMUTEX_CONTESTED) == 0) { 904162536Sdavidxu old = casuword32(m, owner, UMUTEX_UNOWNED); 905162536Sdavidxu if (old == -1) 906162536Sdavidxu return (EFAULT); 907162536Sdavidxu if (old == owner) 908162536Sdavidxu return (0); 909162536Sdavidxu owner = old; 910162536Sdavidxu } 911162536Sdavidxu 912162536Sdavidxu /* We should only ever be in here for contested locks */ 913162536Sdavidxu if ((error = umtx_key_get(m, TYPE_SIMPLE_LOCK, AUTO_SHARE, 914162536Sdavidxu &key)) != 0) 915162536Sdavidxu return (error); 916162536Sdavidxu 917162536Sdavidxu umtxq_lock(&key); 918162536Sdavidxu umtxq_busy(&key); 919162536Sdavidxu count = umtxq_count(&key); 920162536Sdavidxu umtxq_unlock(&key); 921162536Sdavidxu 922162536Sdavidxu /* 923162536Sdavidxu * When unlocking the umtx, it must be marked as unowned if 924162536Sdavidxu * there is zero or one thread only waiting for it. 925162536Sdavidxu * Otherwise, it must be marked as contested. 926162536Sdavidxu */ 927162536Sdavidxu old = casuword32(m, owner, 928162536Sdavidxu count <= 1 ? UMUTEX_UNOWNED : UMUTEX_CONTESTED); 929162536Sdavidxu umtxq_lock(&key); 930162536Sdavidxu umtxq_signal(&key,1); 931162536Sdavidxu umtxq_unbusy(&key); 932162536Sdavidxu umtxq_unlock(&key); 933162536Sdavidxu umtx_key_release(&key); 934162536Sdavidxu if (old == -1) 935162536Sdavidxu return (EFAULT); 936162536Sdavidxu if (old != owner) 937162536Sdavidxu return (EINVAL); 938162536Sdavidxu return (0); 939162536Sdavidxu} 940162536Sdavidxu#endif 941162536Sdavidxu 942162536Sdavidxu/* 943161678Sdavidxu * Fetch and compare value, sleep on the address if value is not changed. 944161678Sdavidxu */ 945139013Sdavidxustatic int 946163449Sdavidxudo_wait(struct thread *td, void *addr, u_long id, 947162536Sdavidxu struct timespec *timeout, int compat32) 948139013Sdavidxu{ 949143149Sdavidxu struct umtx_q *uq; 950140245Sdavidxu struct timespec ts, ts2, ts3; 951139013Sdavidxu struct timeval tv; 952163449Sdavidxu u_long tmp; 953140245Sdavidxu int error = 0; 954139013Sdavidxu 955143149Sdavidxu uq = td->td_umtxq; 956162536Sdavidxu if ((error = umtx_key_get(addr, TYPE_SIMPLE_WAIT, AUTO_SHARE, 957161678Sdavidxu &uq->uq_key)) != 0) 958139013Sdavidxu return (error); 959161678Sdavidxu 960161678Sdavidxu umtxq_lock(&uq->uq_key); 961161678Sdavidxu umtxq_insert(uq); 962161678Sdavidxu umtxq_unlock(&uq->uq_key); 963162536Sdavidxu if (compat32 == 0) 964162536Sdavidxu tmp = fuword(addr); 965162536Sdavidxu else 966162536Sdavidxu tmp = fuword32(addr); 967139427Sdavidxu if (tmp != id) { 968143149Sdavidxu umtxq_lock(&uq->uq_key); 969143149Sdavidxu umtxq_remove(uq); 970143149Sdavidxu umtxq_unlock(&uq->uq_key); 971140245Sdavidxu } else if (timeout == NULL) { 972143149Sdavidxu umtxq_lock(&uq->uq_key); 973164839Sdavidxu error = umtxq_sleep(uq, "uwait", 0); 974161678Sdavidxu umtxq_remove(uq); 975143149Sdavidxu umtxq_unlock(&uq->uq_key); 976139013Sdavidxu } else { 977140245Sdavidxu getnanouptime(&ts); 978140245Sdavidxu timespecadd(&ts, timeout); 979140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 980161678Sdavidxu umtxq_lock(&uq->uq_key); 981139013Sdavidxu for (;;) { 982164839Sdavidxu error = umtxq_sleep(uq, "uwait", tvtohz(&tv)); 983161678Sdavidxu if (!(uq->uq_flags & UQF_UMTXQ)) 984161678Sdavidxu break; 985140245Sdavidxu if (error != ETIMEDOUT) 986140245Sdavidxu break; 987161678Sdavidxu umtxq_unlock(&uq->uq_key); 988140245Sdavidxu getnanouptime(&ts2); 989140245Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 990139751Sdavidxu error = ETIMEDOUT; 991161678Sdavidxu umtxq_lock(&uq->uq_key); 992139013Sdavidxu break; 993139013Sdavidxu } 994140245Sdavidxu ts3 = ts; 995140245Sdavidxu timespecsub(&ts3, &ts2); 996140245Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 997161678Sdavidxu umtxq_lock(&uq->uq_key); 998139013Sdavidxu } 999143149Sdavidxu umtxq_remove(uq); 1000143149Sdavidxu umtxq_unlock(&uq->uq_key); 1001139013Sdavidxu } 1002143149Sdavidxu umtx_key_release(&uq->uq_key); 1003139257Sdavidxu if (error == ERESTART) 1004139257Sdavidxu error = EINTR; 1005139013Sdavidxu return (error); 1006139013Sdavidxu} 1007139013Sdavidxu 1008161678Sdavidxu/* 1009161678Sdavidxu * Wake up threads sleeping on the specified address. 1010161678Sdavidxu */ 1011151692Sdavidxuint 1012151692Sdavidxukern_umtx_wake(struct thread *td, void *uaddr, int n_wake) 1013139013Sdavidxu{ 1014139013Sdavidxu struct umtx_key key; 1015139257Sdavidxu int ret; 1016139013Sdavidxu 1017161678Sdavidxu if ((ret = umtx_key_get(uaddr, TYPE_SIMPLE_WAIT, AUTO_SHARE, 1018161678Sdavidxu &key)) != 0) 1019139257Sdavidxu return (ret); 1020139258Sdavidxu umtxq_lock(&key); 1021139257Sdavidxu ret = umtxq_signal(&key, n_wake); 1022139258Sdavidxu umtxq_unlock(&key); 1023139257Sdavidxu umtx_key_release(&key); 1024139013Sdavidxu return (0); 1025139013Sdavidxu} 1026139013Sdavidxu 1027161678Sdavidxu/* 1028161678Sdavidxu * Lock PTHREAD_PRIO_NONE protocol POSIX mutex. 1029161678Sdavidxu */ 1030161678Sdavidxustatic int 1031161678Sdavidxu_do_lock_normal(struct thread *td, struct umutex *m, uint32_t flags, int timo, 1032161678Sdavidxu int try) 1033161678Sdavidxu{ 1034161678Sdavidxu struct umtx_q *uq; 1035161678Sdavidxu uint32_t owner, old, id; 1036161678Sdavidxu int error = 0; 1037161678Sdavidxu 1038161678Sdavidxu id = td->td_tid; 1039161678Sdavidxu uq = td->td_umtxq; 1040161678Sdavidxu 1041161678Sdavidxu /* 1042161678Sdavidxu * Care must be exercised when dealing with umtx structure. It 1043161678Sdavidxu * can fault on any access. 1044161678Sdavidxu */ 1045161678Sdavidxu for (;;) { 1046161678Sdavidxu /* 1047161678Sdavidxu * Try the uncontested case. This should be done in userland. 1048161678Sdavidxu */ 1049161678Sdavidxu owner = casuword32(&m->m_owner, UMUTEX_UNOWNED, id); 1050161678Sdavidxu 1051161678Sdavidxu /* The acquire succeeded. */ 1052161678Sdavidxu if (owner == UMUTEX_UNOWNED) 1053161678Sdavidxu return (0); 1054161678Sdavidxu 1055161678Sdavidxu /* The address was invalid. */ 1056161678Sdavidxu if (owner == -1) 1057161678Sdavidxu return (EFAULT); 1058161678Sdavidxu 1059161678Sdavidxu /* If no one owns it but it is contested try to acquire it. */ 1060161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 1061161678Sdavidxu owner = casuword32(&m->m_owner, 1062161678Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 1063161678Sdavidxu 1064161678Sdavidxu if (owner == UMUTEX_CONTESTED) 1065161678Sdavidxu return (0); 1066161678Sdavidxu 1067161678Sdavidxu /* The address was invalid. */ 1068161678Sdavidxu if (owner == -1) 1069161678Sdavidxu return (EFAULT); 1070161678Sdavidxu 1071161678Sdavidxu /* If this failed the lock has changed, restart. */ 1072161678Sdavidxu continue; 1073161678Sdavidxu } 1074161678Sdavidxu 1075161678Sdavidxu if ((flags & UMUTEX_ERROR_CHECK) != 0 && 1076161678Sdavidxu (owner & ~UMUTEX_CONTESTED) == id) 1077161678Sdavidxu return (EDEADLK); 1078161678Sdavidxu 1079161678Sdavidxu if (try != 0) 1080161678Sdavidxu return (EBUSY); 1081161678Sdavidxu 1082161678Sdavidxu /* 1083161678Sdavidxu * If we caught a signal, we have retried and now 1084161678Sdavidxu * exit immediately. 1085161678Sdavidxu */ 1086161678Sdavidxu if (error != 0) 1087161678Sdavidxu return (error); 1088161678Sdavidxu 1089161678Sdavidxu if ((error = umtx_key_get(m, TYPE_NORMAL_UMUTEX, 1090161678Sdavidxu GET_SHARE(flags), &uq->uq_key)) != 0) 1091161678Sdavidxu return (error); 1092161678Sdavidxu 1093161678Sdavidxu umtxq_lock(&uq->uq_key); 1094161678Sdavidxu umtxq_busy(&uq->uq_key); 1095161678Sdavidxu umtxq_insert(uq); 1096161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1097161678Sdavidxu umtxq_unlock(&uq->uq_key); 1098161678Sdavidxu 1099161678Sdavidxu /* 1100161678Sdavidxu * Set the contested bit so that a release in user space 1101161678Sdavidxu * knows to use the system call for unlock. If this fails 1102161678Sdavidxu * either some one else has acquired the lock or it has been 1103161678Sdavidxu * released. 1104161678Sdavidxu */ 1105161678Sdavidxu old = casuword32(&m->m_owner, owner, owner | UMUTEX_CONTESTED); 1106161678Sdavidxu 1107161678Sdavidxu /* The address was invalid. */ 1108161678Sdavidxu if (old == -1) { 1109161678Sdavidxu umtxq_lock(&uq->uq_key); 1110161678Sdavidxu umtxq_remove(uq); 1111161678Sdavidxu umtxq_unlock(&uq->uq_key); 1112161678Sdavidxu umtx_key_release(&uq->uq_key); 1113161678Sdavidxu return (EFAULT); 1114161678Sdavidxu } 1115161678Sdavidxu 1116161678Sdavidxu /* 1117161678Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 1118161678Sdavidxu * and we need to retry or we lost a race to the thread 1119161678Sdavidxu * unlocking the umtx. 1120161678Sdavidxu */ 1121161678Sdavidxu umtxq_lock(&uq->uq_key); 1122161678Sdavidxu if (old == owner) 1123161678Sdavidxu error = umtxq_sleep(uq, "umtxn", timo); 1124161678Sdavidxu umtxq_remove(uq); 1125161678Sdavidxu umtxq_unlock(&uq->uq_key); 1126161678Sdavidxu umtx_key_release(&uq->uq_key); 1127161678Sdavidxu } 1128161678Sdavidxu 1129161678Sdavidxu return (0); 1130161678Sdavidxu} 1131161678Sdavidxu 1132161678Sdavidxu/* 1133161678Sdavidxu * Lock PTHREAD_PRIO_NONE protocol POSIX mutex. 1134161678Sdavidxu */ 1135161678Sdavidxu/* 1136161678Sdavidxu * Unlock PTHREAD_PRIO_NONE protocol POSIX mutex. 1137161678Sdavidxu */ 1138161678Sdavidxustatic int 1139161678Sdavidxudo_unlock_normal(struct thread *td, struct umutex *m, uint32_t flags) 1140161678Sdavidxu{ 1141161678Sdavidxu struct umtx_key key; 1142161678Sdavidxu uint32_t owner, old, id; 1143161678Sdavidxu int error; 1144161678Sdavidxu int count; 1145161678Sdavidxu 1146161678Sdavidxu id = td->td_tid; 1147161678Sdavidxu /* 1148161678Sdavidxu * Make sure we own this mtx. 1149161678Sdavidxu */ 1150163449Sdavidxu owner = fuword32(__DEVOLATILE(uint32_t *, &m->m_owner)); 1151161678Sdavidxu if (owner == -1) 1152161678Sdavidxu return (EFAULT); 1153161678Sdavidxu 1154161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 1155161678Sdavidxu return (EPERM); 1156161678Sdavidxu 1157161678Sdavidxu /* This should be done in userland */ 1158161678Sdavidxu if ((owner & UMUTEX_CONTESTED) == 0) { 1159161678Sdavidxu old = casuword32(&m->m_owner, owner, UMUTEX_UNOWNED); 1160161678Sdavidxu if (old == -1) 1161161678Sdavidxu return (EFAULT); 1162161678Sdavidxu if (old == owner) 1163161678Sdavidxu return (0); 1164161855Sdavidxu owner = old; 1165161678Sdavidxu } 1166161678Sdavidxu 1167161678Sdavidxu /* We should only ever be in here for contested locks */ 1168161678Sdavidxu if ((error = umtx_key_get(m, TYPE_NORMAL_UMUTEX, GET_SHARE(flags), 1169161678Sdavidxu &key)) != 0) 1170161678Sdavidxu return (error); 1171161678Sdavidxu 1172161678Sdavidxu umtxq_lock(&key); 1173161678Sdavidxu umtxq_busy(&key); 1174161678Sdavidxu count = umtxq_count(&key); 1175161678Sdavidxu umtxq_unlock(&key); 1176161678Sdavidxu 1177161678Sdavidxu /* 1178161678Sdavidxu * When unlocking the umtx, it must be marked as unowned if 1179161678Sdavidxu * there is zero or one thread only waiting for it. 1180161678Sdavidxu * Otherwise, it must be marked as contested. 1181161678Sdavidxu */ 1182161678Sdavidxu old = casuword32(&m->m_owner, owner, 1183161678Sdavidxu count <= 1 ? UMUTEX_UNOWNED : UMUTEX_CONTESTED); 1184161678Sdavidxu umtxq_lock(&key); 1185161678Sdavidxu umtxq_signal(&key,1); 1186161678Sdavidxu umtxq_unbusy(&key); 1187161678Sdavidxu umtxq_unlock(&key); 1188161678Sdavidxu umtx_key_release(&key); 1189161678Sdavidxu if (old == -1) 1190161678Sdavidxu return (EFAULT); 1191161678Sdavidxu if (old != owner) 1192161678Sdavidxu return (EINVAL); 1193161678Sdavidxu return (0); 1194161678Sdavidxu} 1195161678Sdavidxu 1196161678Sdavidxustatic inline struct umtx_pi * 1197163697Sdavidxuumtx_pi_alloc(int flags) 1198161678Sdavidxu{ 1199161678Sdavidxu struct umtx_pi *pi; 1200161678Sdavidxu 1201163697Sdavidxu pi = uma_zalloc(umtx_pi_zone, M_ZERO | flags); 1202161678Sdavidxu TAILQ_INIT(&pi->pi_blocked); 1203161678Sdavidxu atomic_add_int(&umtx_pi_allocated, 1); 1204161678Sdavidxu return (pi); 1205161678Sdavidxu} 1206161678Sdavidxu 1207161678Sdavidxustatic inline void 1208161678Sdavidxuumtx_pi_free(struct umtx_pi *pi) 1209161678Sdavidxu{ 1210161678Sdavidxu uma_zfree(umtx_pi_zone, pi); 1211161678Sdavidxu atomic_add_int(&umtx_pi_allocated, -1); 1212161678Sdavidxu} 1213161678Sdavidxu 1214161678Sdavidxu/* 1215161678Sdavidxu * Adjust the thread's position on a pi_state after its priority has been 1216161678Sdavidxu * changed. 1217161678Sdavidxu */ 1218161678Sdavidxustatic int 1219161678Sdavidxuumtx_pi_adjust_thread(struct umtx_pi *pi, struct thread *td) 1220161678Sdavidxu{ 1221161678Sdavidxu struct umtx_q *uq, *uq1, *uq2; 1222161678Sdavidxu struct thread *td1; 1223161678Sdavidxu 1224170300Sjeff mtx_assert(&umtx_lock, MA_OWNED); 1225161678Sdavidxu if (pi == NULL) 1226161678Sdavidxu return (0); 1227161678Sdavidxu 1228161678Sdavidxu uq = td->td_umtxq; 1229161678Sdavidxu 1230161678Sdavidxu /* 1231161678Sdavidxu * Check if the thread needs to be moved on the blocked chain. 1232161678Sdavidxu * It needs to be moved if either its priority is lower than 1233161678Sdavidxu * the previous thread or higher than the next thread. 1234161678Sdavidxu */ 1235161678Sdavidxu uq1 = TAILQ_PREV(uq, umtxq_head, uq_lockq); 1236161678Sdavidxu uq2 = TAILQ_NEXT(uq, uq_lockq); 1237161678Sdavidxu if ((uq1 != NULL && UPRI(td) < UPRI(uq1->uq_thread)) || 1238161678Sdavidxu (uq2 != NULL && UPRI(td) > UPRI(uq2->uq_thread))) { 1239161678Sdavidxu /* 1240161678Sdavidxu * Remove thread from blocked chain and determine where 1241161678Sdavidxu * it should be moved to. 1242161678Sdavidxu */ 1243161678Sdavidxu TAILQ_REMOVE(&pi->pi_blocked, uq, uq_lockq); 1244161678Sdavidxu TAILQ_FOREACH(uq1, &pi->pi_blocked, uq_lockq) { 1245161678Sdavidxu td1 = uq1->uq_thread; 1246161678Sdavidxu MPASS(td1->td_proc->p_magic == P_MAGIC); 1247161678Sdavidxu if (UPRI(td1) > UPRI(td)) 1248161678Sdavidxu break; 1249161678Sdavidxu } 1250161678Sdavidxu 1251161678Sdavidxu if (uq1 == NULL) 1252161678Sdavidxu TAILQ_INSERT_TAIL(&pi->pi_blocked, uq, uq_lockq); 1253161678Sdavidxu else 1254161678Sdavidxu TAILQ_INSERT_BEFORE(uq1, uq, uq_lockq); 1255161678Sdavidxu } 1256161678Sdavidxu return (1); 1257161678Sdavidxu} 1258161678Sdavidxu 1259161678Sdavidxu/* 1260161678Sdavidxu * Propagate priority when a thread is blocked on POSIX 1261161678Sdavidxu * PI mutex. 1262161678Sdavidxu */ 1263161678Sdavidxustatic void 1264161678Sdavidxuumtx_propagate_priority(struct thread *td) 1265161678Sdavidxu{ 1266161678Sdavidxu struct umtx_q *uq; 1267161678Sdavidxu struct umtx_pi *pi; 1268161678Sdavidxu int pri; 1269161678Sdavidxu 1270170300Sjeff mtx_assert(&umtx_lock, MA_OWNED); 1271161678Sdavidxu pri = UPRI(td); 1272161678Sdavidxu uq = td->td_umtxq; 1273161678Sdavidxu pi = uq->uq_pi_blocked; 1274161678Sdavidxu if (pi == NULL) 1275161678Sdavidxu return; 1276161678Sdavidxu 1277161678Sdavidxu for (;;) { 1278161678Sdavidxu td = pi->pi_owner; 1279161678Sdavidxu if (td == NULL) 1280161678Sdavidxu return; 1281161678Sdavidxu 1282161678Sdavidxu MPASS(td->td_proc != NULL); 1283161678Sdavidxu MPASS(td->td_proc->p_magic == P_MAGIC); 1284161678Sdavidxu 1285161678Sdavidxu if (UPRI(td) <= pri) 1286161678Sdavidxu return; 1287161678Sdavidxu 1288170300Sjeff thread_lock(td); 1289161678Sdavidxu sched_lend_user_prio(td, pri); 1290170300Sjeff thread_unlock(td); 1291161678Sdavidxu 1292161678Sdavidxu /* 1293161678Sdavidxu * Pick up the lock that td is blocked on. 1294161678Sdavidxu */ 1295161678Sdavidxu uq = td->td_umtxq; 1296161678Sdavidxu pi = uq->uq_pi_blocked; 1297161678Sdavidxu /* Resort td on the list if needed. */ 1298161678Sdavidxu if (!umtx_pi_adjust_thread(pi, td)) 1299161678Sdavidxu break; 1300161678Sdavidxu } 1301161678Sdavidxu} 1302161678Sdavidxu 1303161678Sdavidxu/* 1304161678Sdavidxu * Unpropagate priority for a PI mutex when a thread blocked on 1305161678Sdavidxu * it is interrupted by signal or resumed by others. 1306161678Sdavidxu */ 1307161678Sdavidxustatic void 1308161678Sdavidxuumtx_unpropagate_priority(struct umtx_pi *pi) 1309161678Sdavidxu{ 1310161678Sdavidxu struct umtx_q *uq, *uq_owner; 1311161678Sdavidxu struct umtx_pi *pi2; 1312174701Sdavidxu int pri, oldpri; 1313161678Sdavidxu 1314170300Sjeff mtx_assert(&umtx_lock, MA_OWNED); 1315161678Sdavidxu 1316161678Sdavidxu while (pi != NULL && pi->pi_owner != NULL) { 1317161678Sdavidxu pri = PRI_MAX; 1318161678Sdavidxu uq_owner = pi->pi_owner->td_umtxq; 1319161678Sdavidxu 1320161678Sdavidxu TAILQ_FOREACH(pi2, &uq_owner->uq_pi_contested, pi_link) { 1321161678Sdavidxu uq = TAILQ_FIRST(&pi2->pi_blocked); 1322161678Sdavidxu if (uq != NULL) { 1323161678Sdavidxu if (pri > UPRI(uq->uq_thread)) 1324161678Sdavidxu pri = UPRI(uq->uq_thread); 1325161678Sdavidxu } 1326161678Sdavidxu } 1327161678Sdavidxu 1328161678Sdavidxu if (pri > uq_owner->uq_inherited_pri) 1329161678Sdavidxu pri = uq_owner->uq_inherited_pri; 1330170300Sjeff thread_lock(pi->pi_owner); 1331174701Sdavidxu oldpri = pi->pi_owner->td_user_pri; 1332161678Sdavidxu sched_unlend_user_prio(pi->pi_owner, pri); 1333170300Sjeff thread_unlock(pi->pi_owner); 1334174701Sdavidxu umtx_pi_adjust_locked(pi->pi_owner, oldpri); 1335161678Sdavidxu pi = uq_owner->uq_pi_blocked; 1336161678Sdavidxu } 1337161678Sdavidxu} 1338161678Sdavidxu 1339161678Sdavidxu/* 1340161678Sdavidxu * Insert a PI mutex into owned list. 1341161678Sdavidxu */ 1342161678Sdavidxustatic void 1343161678Sdavidxuumtx_pi_setowner(struct umtx_pi *pi, struct thread *owner) 1344161678Sdavidxu{ 1345161678Sdavidxu struct umtx_q *uq_owner; 1346161678Sdavidxu 1347161678Sdavidxu uq_owner = owner->td_umtxq; 1348170300Sjeff mtx_assert(&umtx_lock, MA_OWNED); 1349161678Sdavidxu if (pi->pi_owner != NULL) 1350161678Sdavidxu panic("pi_ower != NULL"); 1351161678Sdavidxu pi->pi_owner = owner; 1352161678Sdavidxu TAILQ_INSERT_TAIL(&uq_owner->uq_pi_contested, pi, pi_link); 1353161678Sdavidxu} 1354161678Sdavidxu 1355161678Sdavidxu/* 1356161678Sdavidxu * Claim ownership of a PI mutex. 1357161678Sdavidxu */ 1358161678Sdavidxustatic int 1359161678Sdavidxuumtx_pi_claim(struct umtx_pi *pi, struct thread *owner) 1360161678Sdavidxu{ 1361161678Sdavidxu struct umtx_q *uq, *uq_owner; 1362161678Sdavidxu 1363161678Sdavidxu uq_owner = owner->td_umtxq; 1364170300Sjeff mtx_lock_spin(&umtx_lock); 1365161678Sdavidxu if (pi->pi_owner == owner) { 1366170300Sjeff mtx_unlock_spin(&umtx_lock); 1367161678Sdavidxu return (0); 1368161678Sdavidxu } 1369161678Sdavidxu 1370161678Sdavidxu if (pi->pi_owner != NULL) { 1371161678Sdavidxu /* 1372161678Sdavidxu * userland may have already messed the mutex, sigh. 1373161678Sdavidxu */ 1374170300Sjeff mtx_unlock_spin(&umtx_lock); 1375161678Sdavidxu return (EPERM); 1376161678Sdavidxu } 1377161678Sdavidxu umtx_pi_setowner(pi, owner); 1378161678Sdavidxu uq = TAILQ_FIRST(&pi->pi_blocked); 1379161678Sdavidxu if (uq != NULL) { 1380161678Sdavidxu int pri; 1381161678Sdavidxu 1382161678Sdavidxu pri = UPRI(uq->uq_thread); 1383170300Sjeff thread_lock(owner); 1384161678Sdavidxu if (pri < UPRI(owner)) 1385161678Sdavidxu sched_lend_user_prio(owner, pri); 1386170300Sjeff thread_unlock(owner); 1387161678Sdavidxu } 1388170300Sjeff mtx_unlock_spin(&umtx_lock); 1389161678Sdavidxu return (0); 1390161678Sdavidxu} 1391161678Sdavidxu 1392174701Sdavidxustatic void 1393174701Sdavidxuumtx_pi_adjust_locked(struct thread *td, u_char oldpri) 1394161599Sdavidxu{ 1395161678Sdavidxu struct umtx_q *uq; 1396161678Sdavidxu struct umtx_pi *pi; 1397161678Sdavidxu 1398161678Sdavidxu uq = td->td_umtxq; 1399161678Sdavidxu /* 1400161678Sdavidxu * Pick up the lock that td is blocked on. 1401161678Sdavidxu */ 1402161678Sdavidxu pi = uq->uq_pi_blocked; 1403161678Sdavidxu MPASS(pi != NULL); 1404161678Sdavidxu 1405161678Sdavidxu /* Resort the turnstile on the list. */ 1406161678Sdavidxu if (!umtx_pi_adjust_thread(pi, td)) 1407161678Sdavidxu return; 1408161678Sdavidxu 1409161678Sdavidxu /* 1410161678Sdavidxu * If our priority was lowered and we are at the head of the 1411161678Sdavidxu * turnstile, then propagate our new priority up the chain. 1412161678Sdavidxu */ 1413161678Sdavidxu if (uq == TAILQ_FIRST(&pi->pi_blocked) && UPRI(td) < oldpri) 1414161678Sdavidxu umtx_propagate_priority(td); 1415161599Sdavidxu} 1416161599Sdavidxu 1417161678Sdavidxu/* 1418174701Sdavidxu * Adjust a thread's order position in its blocked PI mutex, 1419174701Sdavidxu * this may result new priority propagating process. 1420174701Sdavidxu */ 1421174701Sdavidxuvoid 1422174701Sdavidxuumtx_pi_adjust(struct thread *td, u_char oldpri) 1423174701Sdavidxu{ 1424174707Sdavidxu struct umtx_q *uq; 1425174707Sdavidxu struct umtx_pi *pi; 1426174707Sdavidxu 1427174707Sdavidxu uq = td->td_umtxq; 1428174701Sdavidxu mtx_lock_spin(&umtx_lock); 1429174707Sdavidxu /* 1430174707Sdavidxu * Pick up the lock that td is blocked on. 1431174707Sdavidxu */ 1432174707Sdavidxu pi = uq->uq_pi_blocked; 1433174707Sdavidxu if (pi != NULL) 1434174707Sdavidxu umtx_pi_adjust_locked(td, oldpri); 1435174701Sdavidxu mtx_unlock_spin(&umtx_lock); 1436174701Sdavidxu} 1437174701Sdavidxu 1438174701Sdavidxu/* 1439161678Sdavidxu * Sleep on a PI mutex. 1440161678Sdavidxu */ 1441161678Sdavidxustatic int 1442161678Sdavidxuumtxq_sleep_pi(struct umtx_q *uq, struct umtx_pi *pi, 1443161678Sdavidxu uint32_t owner, const char *wmesg, int timo) 1444161678Sdavidxu{ 1445161678Sdavidxu struct umtxq_chain *uc; 1446161678Sdavidxu struct thread *td, *td1; 1447161678Sdavidxu struct umtx_q *uq1; 1448161678Sdavidxu int pri; 1449161678Sdavidxu int error = 0; 1450161678Sdavidxu 1451161678Sdavidxu td = uq->uq_thread; 1452161678Sdavidxu KASSERT(td == curthread, ("inconsistent uq_thread")); 1453161678Sdavidxu uc = umtxq_getchain(&uq->uq_key); 1454161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1455161678Sdavidxu umtxq_insert(uq); 1456161678Sdavidxu if (pi->pi_owner == NULL) { 1457161678Sdavidxu /* XXX 1458161678Sdavidxu * Current, We only support process private PI-mutex, 1459161678Sdavidxu * non-contended PI-mutexes are locked in userland. 1460161678Sdavidxu * Process shared PI-mutex should always be initialized 1461161678Sdavidxu * by kernel and be registered in kernel, locking should 1462161678Sdavidxu * always be done by kernel to avoid security problems. 1463161678Sdavidxu * For process private PI-mutex, we can find owner 1464161678Sdavidxu * thread and boost its priority safely. 1465161678Sdavidxu */ 1466161678Sdavidxu PROC_LOCK(curproc); 1467161678Sdavidxu td1 = thread_find(curproc, owner); 1468170300Sjeff mtx_lock_spin(&umtx_lock); 1469161678Sdavidxu if (td1 != NULL && pi->pi_owner == NULL) { 1470161678Sdavidxu uq1 = td1->td_umtxq; 1471161678Sdavidxu umtx_pi_setowner(pi, td1); 1472161678Sdavidxu } 1473161678Sdavidxu PROC_UNLOCK(curproc); 1474161678Sdavidxu } else { 1475170300Sjeff mtx_lock_spin(&umtx_lock); 1476161678Sdavidxu } 1477161678Sdavidxu 1478161678Sdavidxu TAILQ_FOREACH(uq1, &pi->pi_blocked, uq_lockq) { 1479161678Sdavidxu pri = UPRI(uq1->uq_thread); 1480161678Sdavidxu if (pri > UPRI(td)) 1481161678Sdavidxu break; 1482161678Sdavidxu } 1483161678Sdavidxu 1484161678Sdavidxu if (uq1 != NULL) 1485161678Sdavidxu TAILQ_INSERT_BEFORE(uq1, uq, uq_lockq); 1486161678Sdavidxu else 1487161678Sdavidxu TAILQ_INSERT_TAIL(&pi->pi_blocked, uq, uq_lockq); 1488161678Sdavidxu 1489161678Sdavidxu uq->uq_pi_blocked = pi; 1490174701Sdavidxu thread_lock(td); 1491161678Sdavidxu td->td_flags |= TDF_UPIBLOCKED; 1492174701Sdavidxu thread_unlock(td); 1493170300Sjeff mtx_unlock_spin(&umtx_lock); 1494161678Sdavidxu umtxq_unlock(&uq->uq_key); 1495161678Sdavidxu 1496170300Sjeff mtx_lock_spin(&umtx_lock); 1497161678Sdavidxu umtx_propagate_priority(td); 1498170300Sjeff mtx_unlock_spin(&umtx_lock); 1499161678Sdavidxu 1500161678Sdavidxu umtxq_lock(&uq->uq_key); 1501161678Sdavidxu if (uq->uq_flags & UQF_UMTXQ) { 1502161678Sdavidxu error = msleep(uq, &uc->uc_lock, PCATCH, wmesg, timo); 1503161678Sdavidxu if (error == EWOULDBLOCK) 1504161678Sdavidxu error = ETIMEDOUT; 1505161678Sdavidxu if (uq->uq_flags & UQF_UMTXQ) { 1506161678Sdavidxu umtxq_busy(&uq->uq_key); 1507161678Sdavidxu umtxq_remove(uq); 1508161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1509161678Sdavidxu } 1510161678Sdavidxu } 1511161678Sdavidxu umtxq_unlock(&uq->uq_key); 1512161678Sdavidxu 1513170300Sjeff mtx_lock_spin(&umtx_lock); 1514161678Sdavidxu uq->uq_pi_blocked = NULL; 1515174701Sdavidxu thread_lock(td); 1516161678Sdavidxu td->td_flags &= ~TDF_UPIBLOCKED; 1517174701Sdavidxu thread_unlock(td); 1518161678Sdavidxu TAILQ_REMOVE(&pi->pi_blocked, uq, uq_lockq); 1519161678Sdavidxu umtx_unpropagate_priority(pi); 1520170300Sjeff mtx_unlock_spin(&umtx_lock); 1521161678Sdavidxu 1522161678Sdavidxu umtxq_lock(&uq->uq_key); 1523161678Sdavidxu 1524161678Sdavidxu return (error); 1525161678Sdavidxu} 1526161678Sdavidxu 1527161678Sdavidxu/* 1528161678Sdavidxu * Add reference count for a PI mutex. 1529161678Sdavidxu */ 1530161678Sdavidxustatic void 1531161678Sdavidxuumtx_pi_ref(struct umtx_pi *pi) 1532161678Sdavidxu{ 1533161678Sdavidxu struct umtxq_chain *uc; 1534161678Sdavidxu 1535161678Sdavidxu uc = umtxq_getchain(&pi->pi_key); 1536161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1537161678Sdavidxu pi->pi_refcount++; 1538161678Sdavidxu} 1539161678Sdavidxu 1540161678Sdavidxu/* 1541161678Sdavidxu * Decrease reference count for a PI mutex, if the counter 1542161678Sdavidxu * is decreased to zero, its memory space is freed. 1543161678Sdavidxu */ 1544161678Sdavidxustatic void 1545161678Sdavidxuumtx_pi_unref(struct umtx_pi *pi) 1546161678Sdavidxu{ 1547161678Sdavidxu struct umtxq_chain *uc; 1548161678Sdavidxu int free = 0; 1549161678Sdavidxu 1550161678Sdavidxu uc = umtxq_getchain(&pi->pi_key); 1551161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1552161678Sdavidxu KASSERT(pi->pi_refcount > 0, ("invalid reference count")); 1553161678Sdavidxu if (--pi->pi_refcount == 0) { 1554170300Sjeff mtx_lock_spin(&umtx_lock); 1555161678Sdavidxu if (pi->pi_owner != NULL) { 1556161678Sdavidxu TAILQ_REMOVE(&pi->pi_owner->td_umtxq->uq_pi_contested, 1557161678Sdavidxu pi, pi_link); 1558161678Sdavidxu pi->pi_owner = NULL; 1559161678Sdavidxu } 1560161678Sdavidxu KASSERT(TAILQ_EMPTY(&pi->pi_blocked), 1561161678Sdavidxu ("blocked queue not empty")); 1562170300Sjeff mtx_unlock_spin(&umtx_lock); 1563161678Sdavidxu TAILQ_REMOVE(&uc->uc_pi_list, pi, pi_hashlink); 1564161678Sdavidxu free = 1; 1565161678Sdavidxu } 1566161678Sdavidxu if (free) 1567161678Sdavidxu umtx_pi_free(pi); 1568161678Sdavidxu} 1569161678Sdavidxu 1570161678Sdavidxu/* 1571161678Sdavidxu * Find a PI mutex in hash table. 1572161678Sdavidxu */ 1573161678Sdavidxustatic struct umtx_pi * 1574161678Sdavidxuumtx_pi_lookup(struct umtx_key *key) 1575161678Sdavidxu{ 1576161678Sdavidxu struct umtxq_chain *uc; 1577161678Sdavidxu struct umtx_pi *pi; 1578161678Sdavidxu 1579161678Sdavidxu uc = umtxq_getchain(key); 1580161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1581161678Sdavidxu 1582161678Sdavidxu TAILQ_FOREACH(pi, &uc->uc_pi_list, pi_hashlink) { 1583161678Sdavidxu if (umtx_key_match(&pi->pi_key, key)) { 1584161678Sdavidxu return (pi); 1585161678Sdavidxu } 1586161678Sdavidxu } 1587161678Sdavidxu return (NULL); 1588161678Sdavidxu} 1589161678Sdavidxu 1590161678Sdavidxu/* 1591161678Sdavidxu * Insert a PI mutex into hash table. 1592161678Sdavidxu */ 1593161678Sdavidxustatic inline void 1594161678Sdavidxuumtx_pi_insert(struct umtx_pi *pi) 1595161678Sdavidxu{ 1596161678Sdavidxu struct umtxq_chain *uc; 1597161678Sdavidxu 1598161678Sdavidxu uc = umtxq_getchain(&pi->pi_key); 1599161678Sdavidxu UMTXQ_LOCKED_ASSERT(uc); 1600161678Sdavidxu TAILQ_INSERT_TAIL(&uc->uc_pi_list, pi, pi_hashlink); 1601161678Sdavidxu} 1602161678Sdavidxu 1603161678Sdavidxu/* 1604161678Sdavidxu * Lock a PI mutex. 1605161678Sdavidxu */ 1606161678Sdavidxustatic int 1607161678Sdavidxu_do_lock_pi(struct thread *td, struct umutex *m, uint32_t flags, int timo, 1608161678Sdavidxu int try) 1609161678Sdavidxu{ 1610161678Sdavidxu struct umtx_q *uq; 1611161678Sdavidxu struct umtx_pi *pi, *new_pi; 1612161678Sdavidxu uint32_t id, owner, old; 1613161678Sdavidxu int error; 1614161678Sdavidxu 1615161678Sdavidxu id = td->td_tid; 1616161678Sdavidxu uq = td->td_umtxq; 1617161678Sdavidxu 1618161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PI_UMUTEX, GET_SHARE(flags), 1619161678Sdavidxu &uq->uq_key)) != 0) 1620161678Sdavidxu return (error); 1621163697Sdavidxu umtxq_lock(&uq->uq_key); 1622163697Sdavidxu pi = umtx_pi_lookup(&uq->uq_key); 1623163697Sdavidxu if (pi == NULL) { 1624163697Sdavidxu new_pi = umtx_pi_alloc(M_NOWAIT); 1625163697Sdavidxu if (new_pi == NULL) { 1626161678Sdavidxu umtxq_unlock(&uq->uq_key); 1627163697Sdavidxu new_pi = umtx_pi_alloc(M_WAITOK); 1628161678Sdavidxu new_pi->pi_key = uq->uq_key; 1629161678Sdavidxu umtxq_lock(&uq->uq_key); 1630161678Sdavidxu pi = umtx_pi_lookup(&uq->uq_key); 1631163697Sdavidxu if (pi != NULL) { 1632161678Sdavidxu umtx_pi_free(new_pi); 1633163697Sdavidxu new_pi = NULL; 1634161678Sdavidxu } 1635161678Sdavidxu } 1636163697Sdavidxu if (new_pi != NULL) { 1637163697Sdavidxu new_pi->pi_key = uq->uq_key; 1638163697Sdavidxu umtx_pi_insert(new_pi); 1639163697Sdavidxu pi = new_pi; 1640163697Sdavidxu } 1641163697Sdavidxu } 1642163697Sdavidxu umtx_pi_ref(pi); 1643163697Sdavidxu umtxq_unlock(&uq->uq_key); 1644161678Sdavidxu 1645163697Sdavidxu /* 1646163697Sdavidxu * Care must be exercised when dealing with umtx structure. It 1647163697Sdavidxu * can fault on any access. 1648163697Sdavidxu */ 1649163697Sdavidxu for (;;) { 1650161678Sdavidxu /* 1651161678Sdavidxu * Try the uncontested case. This should be done in userland. 1652161678Sdavidxu */ 1653161678Sdavidxu owner = casuword32(&m->m_owner, UMUTEX_UNOWNED, id); 1654161678Sdavidxu 1655161678Sdavidxu /* The acquire succeeded. */ 1656161678Sdavidxu if (owner == UMUTEX_UNOWNED) { 1657161678Sdavidxu error = 0; 1658161678Sdavidxu break; 1659161678Sdavidxu } 1660161678Sdavidxu 1661161678Sdavidxu /* The address was invalid. */ 1662161678Sdavidxu if (owner == -1) { 1663161678Sdavidxu error = EFAULT; 1664161678Sdavidxu break; 1665161678Sdavidxu } 1666161678Sdavidxu 1667161678Sdavidxu /* If no one owns it but it is contested try to acquire it. */ 1668161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 1669161678Sdavidxu owner = casuword32(&m->m_owner, 1670161678Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 1671161678Sdavidxu 1672161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 1673161678Sdavidxu umtxq_lock(&uq->uq_key); 1674161678Sdavidxu error = umtx_pi_claim(pi, td); 1675161678Sdavidxu umtxq_unlock(&uq->uq_key); 1676161678Sdavidxu break; 1677161678Sdavidxu } 1678161678Sdavidxu 1679161678Sdavidxu /* The address was invalid. */ 1680161678Sdavidxu if (owner == -1) { 1681161678Sdavidxu error = EFAULT; 1682161678Sdavidxu break; 1683161678Sdavidxu } 1684161678Sdavidxu 1685161678Sdavidxu /* If this failed the lock has changed, restart. */ 1686161678Sdavidxu continue; 1687161678Sdavidxu } 1688161678Sdavidxu 1689161678Sdavidxu if ((flags & UMUTEX_ERROR_CHECK) != 0 && 1690161678Sdavidxu (owner & ~UMUTEX_CONTESTED) == id) { 1691161678Sdavidxu error = EDEADLK; 1692161678Sdavidxu break; 1693161678Sdavidxu } 1694161678Sdavidxu 1695161678Sdavidxu if (try != 0) { 1696161678Sdavidxu error = EBUSY; 1697161678Sdavidxu break; 1698161678Sdavidxu } 1699161678Sdavidxu 1700161678Sdavidxu /* 1701161678Sdavidxu * If we caught a signal, we have retried and now 1702161678Sdavidxu * exit immediately. 1703161678Sdavidxu */ 1704161678Sdavidxu if (error != 0) 1705161678Sdavidxu break; 1706161678Sdavidxu 1707161678Sdavidxu umtxq_lock(&uq->uq_key); 1708161678Sdavidxu umtxq_busy(&uq->uq_key); 1709161678Sdavidxu umtxq_unlock(&uq->uq_key); 1710161678Sdavidxu 1711161678Sdavidxu /* 1712161678Sdavidxu * Set the contested bit so that a release in user space 1713161678Sdavidxu * knows to use the system call for unlock. If this fails 1714161678Sdavidxu * either some one else has acquired the lock or it has been 1715161678Sdavidxu * released. 1716161678Sdavidxu */ 1717161678Sdavidxu old = casuword32(&m->m_owner, owner, owner | UMUTEX_CONTESTED); 1718161678Sdavidxu 1719161678Sdavidxu /* The address was invalid. */ 1720161678Sdavidxu if (old == -1) { 1721161678Sdavidxu umtxq_lock(&uq->uq_key); 1722161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1723161678Sdavidxu umtxq_unlock(&uq->uq_key); 1724161678Sdavidxu error = EFAULT; 1725161678Sdavidxu break; 1726161678Sdavidxu } 1727161678Sdavidxu 1728161678Sdavidxu umtxq_lock(&uq->uq_key); 1729161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1730161678Sdavidxu /* 1731161678Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 1732161678Sdavidxu * and we need to retry or we lost a race to the thread 1733161678Sdavidxu * unlocking the umtx. 1734161678Sdavidxu */ 1735161678Sdavidxu if (old == owner) 1736161678Sdavidxu error = umtxq_sleep_pi(uq, pi, owner & ~UMUTEX_CONTESTED, 1737161678Sdavidxu "umtxpi", timo); 1738161678Sdavidxu umtxq_unlock(&uq->uq_key); 1739161678Sdavidxu } 1740161678Sdavidxu 1741163697Sdavidxu umtxq_lock(&uq->uq_key); 1742163697Sdavidxu umtx_pi_unref(pi); 1743163697Sdavidxu umtxq_unlock(&uq->uq_key); 1744161678Sdavidxu 1745161678Sdavidxu umtx_key_release(&uq->uq_key); 1746161678Sdavidxu return (error); 1747161678Sdavidxu} 1748161678Sdavidxu 1749161678Sdavidxu/* 1750161678Sdavidxu * Unlock a PI mutex. 1751161678Sdavidxu */ 1752161678Sdavidxustatic int 1753161678Sdavidxudo_unlock_pi(struct thread *td, struct umutex *m, uint32_t flags) 1754161678Sdavidxu{ 1755161678Sdavidxu struct umtx_key key; 1756161678Sdavidxu struct umtx_q *uq_first, *uq_first2, *uq_me; 1757161678Sdavidxu struct umtx_pi *pi, *pi2; 1758161678Sdavidxu uint32_t owner, old, id; 1759161678Sdavidxu int error; 1760161678Sdavidxu int count; 1761161678Sdavidxu int pri; 1762161678Sdavidxu 1763161678Sdavidxu id = td->td_tid; 1764161678Sdavidxu /* 1765161678Sdavidxu * Make sure we own this mtx. 1766161678Sdavidxu */ 1767163449Sdavidxu owner = fuword32(__DEVOLATILE(uint32_t *, &m->m_owner)); 1768161678Sdavidxu if (owner == -1) 1769161678Sdavidxu return (EFAULT); 1770161678Sdavidxu 1771161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 1772161678Sdavidxu return (EPERM); 1773161678Sdavidxu 1774161678Sdavidxu /* This should be done in userland */ 1775161678Sdavidxu if ((owner & UMUTEX_CONTESTED) == 0) { 1776161678Sdavidxu old = casuword32(&m->m_owner, owner, UMUTEX_UNOWNED); 1777161678Sdavidxu if (old == -1) 1778161678Sdavidxu return (EFAULT); 1779161678Sdavidxu if (old == owner) 1780161678Sdavidxu return (0); 1781161855Sdavidxu owner = old; 1782161678Sdavidxu } 1783161678Sdavidxu 1784161678Sdavidxu /* We should only ever be in here for contested locks */ 1785161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PI_UMUTEX, GET_SHARE(flags), 1786161678Sdavidxu &key)) != 0) 1787161678Sdavidxu return (error); 1788161678Sdavidxu 1789161678Sdavidxu umtxq_lock(&key); 1790161678Sdavidxu umtxq_busy(&key); 1791161678Sdavidxu count = umtxq_count_pi(&key, &uq_first); 1792161678Sdavidxu if (uq_first != NULL) { 1793161678Sdavidxu pi = uq_first->uq_pi_blocked; 1794161678Sdavidxu if (pi->pi_owner != curthread) { 1795161678Sdavidxu umtxq_unbusy(&key); 1796161678Sdavidxu umtxq_unlock(&key); 1797161678Sdavidxu /* userland messed the mutex */ 1798161678Sdavidxu return (EPERM); 1799161678Sdavidxu } 1800161678Sdavidxu uq_me = curthread->td_umtxq; 1801170300Sjeff mtx_lock_spin(&umtx_lock); 1802161678Sdavidxu pi->pi_owner = NULL; 1803161678Sdavidxu TAILQ_REMOVE(&uq_me->uq_pi_contested, pi, pi_link); 1804161678Sdavidxu uq_first = TAILQ_FIRST(&pi->pi_blocked); 1805161678Sdavidxu pri = PRI_MAX; 1806161678Sdavidxu TAILQ_FOREACH(pi2, &uq_me->uq_pi_contested, pi_link) { 1807161678Sdavidxu uq_first2 = TAILQ_FIRST(&pi2->pi_blocked); 1808161678Sdavidxu if (uq_first2 != NULL) { 1809161678Sdavidxu if (pri > UPRI(uq_first2->uq_thread)) 1810161678Sdavidxu pri = UPRI(uq_first2->uq_thread); 1811161678Sdavidxu } 1812161678Sdavidxu } 1813170300Sjeff thread_lock(curthread); 1814161678Sdavidxu sched_unlend_user_prio(curthread, pri); 1815170300Sjeff thread_unlock(curthread); 1816170300Sjeff mtx_unlock_spin(&umtx_lock); 1817161678Sdavidxu } 1818161678Sdavidxu umtxq_unlock(&key); 1819161678Sdavidxu 1820161678Sdavidxu /* 1821161678Sdavidxu * When unlocking the umtx, it must be marked as unowned if 1822161678Sdavidxu * there is zero or one thread only waiting for it. 1823161678Sdavidxu * Otherwise, it must be marked as contested. 1824161678Sdavidxu */ 1825161678Sdavidxu old = casuword32(&m->m_owner, owner, 1826161678Sdavidxu count <= 1 ? UMUTEX_UNOWNED : UMUTEX_CONTESTED); 1827161678Sdavidxu 1828161678Sdavidxu umtxq_lock(&key); 1829161678Sdavidxu if (uq_first != NULL) 1830161678Sdavidxu umtxq_signal_thread(uq_first); 1831161678Sdavidxu umtxq_unbusy(&key); 1832161678Sdavidxu umtxq_unlock(&key); 1833161678Sdavidxu umtx_key_release(&key); 1834161678Sdavidxu if (old == -1) 1835161678Sdavidxu return (EFAULT); 1836161678Sdavidxu if (old != owner) 1837161678Sdavidxu return (EINVAL); 1838161678Sdavidxu return (0); 1839161678Sdavidxu} 1840161678Sdavidxu 1841161678Sdavidxu/* 1842161678Sdavidxu * Lock a PP mutex. 1843161678Sdavidxu */ 1844161678Sdavidxustatic int 1845161678Sdavidxu_do_lock_pp(struct thread *td, struct umutex *m, uint32_t flags, int timo, 1846161678Sdavidxu int try) 1847161678Sdavidxu{ 1848161678Sdavidxu struct umtx_q *uq, *uq2; 1849161678Sdavidxu struct umtx_pi *pi; 1850161678Sdavidxu uint32_t ceiling; 1851161678Sdavidxu uint32_t owner, id; 1852161678Sdavidxu int error, pri, old_inherited_pri, su; 1853161678Sdavidxu 1854161678Sdavidxu id = td->td_tid; 1855161678Sdavidxu uq = td->td_umtxq; 1856161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PP_UMUTEX, GET_SHARE(flags), 1857161678Sdavidxu &uq->uq_key)) != 0) 1858161678Sdavidxu return (error); 1859164033Srwatson su = (priv_check(td, PRIV_SCHED_RTPRIO) == 0); 1860161678Sdavidxu for (;;) { 1861161678Sdavidxu old_inherited_pri = uq->uq_inherited_pri; 1862161678Sdavidxu umtxq_lock(&uq->uq_key); 1863161678Sdavidxu umtxq_busy(&uq->uq_key); 1864161678Sdavidxu umtxq_unlock(&uq->uq_key); 1865161678Sdavidxu 1866161678Sdavidxu ceiling = RTP_PRIO_MAX - fuword32(&m->m_ceilings[0]); 1867161678Sdavidxu if (ceiling > RTP_PRIO_MAX) { 1868161678Sdavidxu error = EINVAL; 1869161678Sdavidxu goto out; 1870161678Sdavidxu } 1871161678Sdavidxu 1872170300Sjeff mtx_lock_spin(&umtx_lock); 1873161678Sdavidxu if (UPRI(td) < PRI_MIN_REALTIME + ceiling) { 1874170300Sjeff mtx_unlock_spin(&umtx_lock); 1875161678Sdavidxu error = EINVAL; 1876161678Sdavidxu goto out; 1877161678Sdavidxu } 1878161678Sdavidxu if (su && PRI_MIN_REALTIME + ceiling < uq->uq_inherited_pri) { 1879161678Sdavidxu uq->uq_inherited_pri = PRI_MIN_REALTIME + ceiling; 1880170300Sjeff thread_lock(td); 1881161678Sdavidxu if (uq->uq_inherited_pri < UPRI(td)) 1882161678Sdavidxu sched_lend_user_prio(td, uq->uq_inherited_pri); 1883170300Sjeff thread_unlock(td); 1884161678Sdavidxu } 1885170300Sjeff mtx_unlock_spin(&umtx_lock); 1886161678Sdavidxu 1887161678Sdavidxu owner = casuword32(&m->m_owner, 1888161678Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 1889161678Sdavidxu 1890161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 1891161678Sdavidxu error = 0; 1892161678Sdavidxu break; 1893161678Sdavidxu } 1894161678Sdavidxu 1895161678Sdavidxu /* The address was invalid. */ 1896161678Sdavidxu if (owner == -1) { 1897161678Sdavidxu error = EFAULT; 1898161678Sdavidxu break; 1899161678Sdavidxu } 1900161678Sdavidxu 1901161678Sdavidxu if ((flags & UMUTEX_ERROR_CHECK) != 0 && 1902161678Sdavidxu (owner & ~UMUTEX_CONTESTED) == id) { 1903161678Sdavidxu error = EDEADLK; 1904161678Sdavidxu break; 1905161678Sdavidxu } 1906161678Sdavidxu 1907161678Sdavidxu if (try != 0) { 1908161678Sdavidxu error = EBUSY; 1909161678Sdavidxu break; 1910161678Sdavidxu } 1911161678Sdavidxu 1912161678Sdavidxu /* 1913161678Sdavidxu * If we caught a signal, we have retried and now 1914161678Sdavidxu * exit immediately. 1915161678Sdavidxu */ 1916161678Sdavidxu if (error != 0) 1917161678Sdavidxu break; 1918161678Sdavidxu 1919161678Sdavidxu umtxq_lock(&uq->uq_key); 1920161678Sdavidxu umtxq_insert(uq); 1921161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1922161678Sdavidxu error = umtxq_sleep(uq, "umtxpp", timo); 1923161678Sdavidxu umtxq_remove(uq); 1924161678Sdavidxu umtxq_unlock(&uq->uq_key); 1925161678Sdavidxu 1926170300Sjeff mtx_lock_spin(&umtx_lock); 1927161678Sdavidxu uq->uq_inherited_pri = old_inherited_pri; 1928161678Sdavidxu pri = PRI_MAX; 1929161678Sdavidxu TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) { 1930161678Sdavidxu uq2 = TAILQ_FIRST(&pi->pi_blocked); 1931161678Sdavidxu if (uq2 != NULL) { 1932161678Sdavidxu if (pri > UPRI(uq2->uq_thread)) 1933161678Sdavidxu pri = UPRI(uq2->uq_thread); 1934161678Sdavidxu } 1935161678Sdavidxu } 1936161678Sdavidxu if (pri > uq->uq_inherited_pri) 1937161678Sdavidxu pri = uq->uq_inherited_pri; 1938170300Sjeff thread_lock(td); 1939161678Sdavidxu sched_unlend_user_prio(td, pri); 1940170300Sjeff thread_unlock(td); 1941170300Sjeff mtx_unlock_spin(&umtx_lock); 1942161678Sdavidxu } 1943161678Sdavidxu 1944161678Sdavidxu if (error != 0) { 1945170300Sjeff mtx_lock_spin(&umtx_lock); 1946161678Sdavidxu uq->uq_inherited_pri = old_inherited_pri; 1947161678Sdavidxu pri = PRI_MAX; 1948161678Sdavidxu TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) { 1949161678Sdavidxu uq2 = TAILQ_FIRST(&pi->pi_blocked); 1950161678Sdavidxu if (uq2 != NULL) { 1951161678Sdavidxu if (pri > UPRI(uq2->uq_thread)) 1952161678Sdavidxu pri = UPRI(uq2->uq_thread); 1953161678Sdavidxu } 1954161678Sdavidxu } 1955161678Sdavidxu if (pri > uq->uq_inherited_pri) 1956161678Sdavidxu pri = uq->uq_inherited_pri; 1957170300Sjeff thread_lock(td); 1958161678Sdavidxu sched_unlend_user_prio(td, pri); 1959170300Sjeff thread_unlock(td); 1960170300Sjeff mtx_unlock_spin(&umtx_lock); 1961161678Sdavidxu } 1962161678Sdavidxu 1963161678Sdavidxuout: 1964161678Sdavidxu umtxq_lock(&uq->uq_key); 1965161678Sdavidxu umtxq_unbusy(&uq->uq_key); 1966161678Sdavidxu umtxq_unlock(&uq->uq_key); 1967161678Sdavidxu umtx_key_release(&uq->uq_key); 1968161678Sdavidxu return (error); 1969161678Sdavidxu} 1970161678Sdavidxu 1971161678Sdavidxu/* 1972161678Sdavidxu * Unlock a PP mutex. 1973161678Sdavidxu */ 1974161678Sdavidxustatic int 1975161678Sdavidxudo_unlock_pp(struct thread *td, struct umutex *m, uint32_t flags) 1976161678Sdavidxu{ 1977161678Sdavidxu struct umtx_key key; 1978161678Sdavidxu struct umtx_q *uq, *uq2; 1979161678Sdavidxu struct umtx_pi *pi; 1980161678Sdavidxu uint32_t owner, id; 1981161678Sdavidxu uint32_t rceiling; 1982161926Sdavidxu int error, pri, new_inherited_pri, su; 1983161678Sdavidxu 1984161678Sdavidxu id = td->td_tid; 1985161678Sdavidxu uq = td->td_umtxq; 1986164033Srwatson su = (priv_check(td, PRIV_SCHED_RTPRIO) == 0); 1987161678Sdavidxu 1988161678Sdavidxu /* 1989161678Sdavidxu * Make sure we own this mtx. 1990161678Sdavidxu */ 1991163449Sdavidxu owner = fuword32(__DEVOLATILE(uint32_t *, &m->m_owner)); 1992161678Sdavidxu if (owner == -1) 1993161678Sdavidxu return (EFAULT); 1994161678Sdavidxu 1995161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) != id) 1996161678Sdavidxu return (EPERM); 1997161678Sdavidxu 1998161678Sdavidxu error = copyin(&m->m_ceilings[1], &rceiling, sizeof(uint32_t)); 1999161678Sdavidxu if (error != 0) 2000161678Sdavidxu return (error); 2001161678Sdavidxu 2002161678Sdavidxu if (rceiling == -1) 2003161678Sdavidxu new_inherited_pri = PRI_MAX; 2004161678Sdavidxu else { 2005161678Sdavidxu rceiling = RTP_PRIO_MAX - rceiling; 2006161678Sdavidxu if (rceiling > RTP_PRIO_MAX) 2007161678Sdavidxu return (EINVAL); 2008161678Sdavidxu new_inherited_pri = PRI_MIN_REALTIME + rceiling; 2009161678Sdavidxu } 2010161678Sdavidxu 2011161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PP_UMUTEX, GET_SHARE(flags), 2012161678Sdavidxu &key)) != 0) 2013161678Sdavidxu return (error); 2014161678Sdavidxu umtxq_lock(&key); 2015161678Sdavidxu umtxq_busy(&key); 2016161678Sdavidxu umtxq_unlock(&key); 2017161678Sdavidxu /* 2018161678Sdavidxu * For priority protected mutex, always set unlocked state 2019161678Sdavidxu * to UMUTEX_CONTESTED, so that userland always enters kernel 2020161678Sdavidxu * to lock the mutex, it is necessary because thread priority 2021161678Sdavidxu * has to be adjusted for such mutex. 2022161678Sdavidxu */ 2023163449Sdavidxu error = suword32(__DEVOLATILE(uint32_t *, &m->m_owner), 2024163449Sdavidxu UMUTEX_CONTESTED); 2025161678Sdavidxu 2026161678Sdavidxu umtxq_lock(&key); 2027161678Sdavidxu if (error == 0) 2028161678Sdavidxu umtxq_signal(&key, 1); 2029161678Sdavidxu umtxq_unbusy(&key); 2030161678Sdavidxu umtxq_unlock(&key); 2031161678Sdavidxu 2032161678Sdavidxu if (error == -1) 2033161678Sdavidxu error = EFAULT; 2034161678Sdavidxu else { 2035170300Sjeff mtx_lock_spin(&umtx_lock); 2036161926Sdavidxu if (su != 0) 2037161926Sdavidxu uq->uq_inherited_pri = new_inherited_pri; 2038161678Sdavidxu pri = PRI_MAX; 2039161678Sdavidxu TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) { 2040161678Sdavidxu uq2 = TAILQ_FIRST(&pi->pi_blocked); 2041161678Sdavidxu if (uq2 != NULL) { 2042161678Sdavidxu if (pri > UPRI(uq2->uq_thread)) 2043161678Sdavidxu pri = UPRI(uq2->uq_thread); 2044161678Sdavidxu } 2045161678Sdavidxu } 2046161678Sdavidxu if (pri > uq->uq_inherited_pri) 2047161678Sdavidxu pri = uq->uq_inherited_pri; 2048170300Sjeff thread_lock(td); 2049161678Sdavidxu sched_unlend_user_prio(td, pri); 2050170300Sjeff thread_unlock(td); 2051170300Sjeff mtx_unlock_spin(&umtx_lock); 2052161678Sdavidxu } 2053161678Sdavidxu umtx_key_release(&key); 2054161678Sdavidxu return (error); 2055161678Sdavidxu} 2056161678Sdavidxu 2057161678Sdavidxustatic int 2058161678Sdavidxudo_set_ceiling(struct thread *td, struct umutex *m, uint32_t ceiling, 2059161678Sdavidxu uint32_t *old_ceiling) 2060161678Sdavidxu{ 2061161678Sdavidxu struct umtx_q *uq; 2062161678Sdavidxu uint32_t save_ceiling; 2063161678Sdavidxu uint32_t owner, id; 2064161678Sdavidxu uint32_t flags; 2065161678Sdavidxu int error; 2066161678Sdavidxu 2067161678Sdavidxu flags = fuword32(&m->m_flags); 2068161678Sdavidxu if ((flags & UMUTEX_PRIO_PROTECT) == 0) 2069161678Sdavidxu return (EINVAL); 2070161678Sdavidxu if (ceiling > RTP_PRIO_MAX) 2071161678Sdavidxu return (EINVAL); 2072161678Sdavidxu id = td->td_tid; 2073161678Sdavidxu uq = td->td_umtxq; 2074161678Sdavidxu if ((error = umtx_key_get(m, TYPE_PP_UMUTEX, GET_SHARE(flags), 2075161678Sdavidxu &uq->uq_key)) != 0) 2076161678Sdavidxu return (error); 2077161678Sdavidxu for (;;) { 2078161678Sdavidxu umtxq_lock(&uq->uq_key); 2079161678Sdavidxu umtxq_busy(&uq->uq_key); 2080161678Sdavidxu umtxq_unlock(&uq->uq_key); 2081161678Sdavidxu 2082161678Sdavidxu save_ceiling = fuword32(&m->m_ceilings[0]); 2083161678Sdavidxu 2084161678Sdavidxu owner = casuword32(&m->m_owner, 2085161678Sdavidxu UMUTEX_CONTESTED, id | UMUTEX_CONTESTED); 2086161678Sdavidxu 2087161678Sdavidxu if (owner == UMUTEX_CONTESTED) { 2088161678Sdavidxu suword32(&m->m_ceilings[0], ceiling); 2089163449Sdavidxu suword32(__DEVOLATILE(uint32_t *, &m->m_owner), 2090163449Sdavidxu UMUTEX_CONTESTED); 2091161678Sdavidxu error = 0; 2092161678Sdavidxu break; 2093161678Sdavidxu } 2094161678Sdavidxu 2095161678Sdavidxu /* The address was invalid. */ 2096161678Sdavidxu if (owner == -1) { 2097161678Sdavidxu error = EFAULT; 2098161678Sdavidxu break; 2099161678Sdavidxu } 2100161678Sdavidxu 2101161678Sdavidxu if ((owner & ~UMUTEX_CONTESTED) == id) { 2102161678Sdavidxu suword32(&m->m_ceilings[0], ceiling); 2103161678Sdavidxu error = 0; 2104161678Sdavidxu break; 2105161678Sdavidxu } 2106161678Sdavidxu 2107161678Sdavidxu /* 2108161678Sdavidxu * If we caught a signal, we have retried and now 2109161678Sdavidxu * exit immediately. 2110161678Sdavidxu */ 2111161678Sdavidxu if (error != 0) 2112161678Sdavidxu break; 2113161678Sdavidxu 2114161678Sdavidxu /* 2115161678Sdavidxu * We set the contested bit, sleep. Otherwise the lock changed 2116161678Sdavidxu * and we need to retry or we lost a race to the thread 2117161678Sdavidxu * unlocking the umtx. 2118161678Sdavidxu */ 2119161678Sdavidxu umtxq_lock(&uq->uq_key); 2120161678Sdavidxu umtxq_insert(uq); 2121161678Sdavidxu umtxq_unbusy(&uq->uq_key); 2122161678Sdavidxu error = umtxq_sleep(uq, "umtxpp", 0); 2123161678Sdavidxu umtxq_remove(uq); 2124161678Sdavidxu umtxq_unlock(&uq->uq_key); 2125161678Sdavidxu } 2126161678Sdavidxu umtxq_lock(&uq->uq_key); 2127161678Sdavidxu if (error == 0) 2128161678Sdavidxu umtxq_signal(&uq->uq_key, INT_MAX); 2129161678Sdavidxu umtxq_unbusy(&uq->uq_key); 2130161678Sdavidxu umtxq_unlock(&uq->uq_key); 2131161678Sdavidxu umtx_key_release(&uq->uq_key); 2132161678Sdavidxu if (error == 0 && old_ceiling != NULL) 2133161678Sdavidxu suword32(old_ceiling, save_ceiling); 2134161678Sdavidxu return (error); 2135161678Sdavidxu} 2136161678Sdavidxu 2137162030Sdavidxustatic int 2138162030Sdavidxu_do_lock_umutex(struct thread *td, struct umutex *m, int flags, int timo, 2139162030Sdavidxu int try) 2140162030Sdavidxu{ 2141162030Sdavidxu switch(flags & (UMUTEX_PRIO_INHERIT | UMUTEX_PRIO_PROTECT)) { 2142162030Sdavidxu case 0: 2143162030Sdavidxu return (_do_lock_normal(td, m, flags, timo, try)); 2144162030Sdavidxu case UMUTEX_PRIO_INHERIT: 2145162030Sdavidxu return (_do_lock_pi(td, m, flags, timo, try)); 2146162030Sdavidxu case UMUTEX_PRIO_PROTECT: 2147162030Sdavidxu return (_do_lock_pp(td, m, flags, timo, try)); 2148162030Sdavidxu } 2149162030Sdavidxu return (EINVAL); 2150162030Sdavidxu} 2151162030Sdavidxu 2152161678Sdavidxu/* 2153161678Sdavidxu * Lock a userland POSIX mutex. 2154161678Sdavidxu */ 2155161678Sdavidxustatic int 2156162030Sdavidxudo_lock_umutex(struct thread *td, struct umutex *m, 2157162030Sdavidxu struct timespec *timeout, int try) 2158161678Sdavidxu{ 2159162030Sdavidxu struct timespec ts, ts2, ts3; 2160162030Sdavidxu struct timeval tv; 2161161678Sdavidxu uint32_t flags; 2162162030Sdavidxu int error; 2163161678Sdavidxu 2164161678Sdavidxu flags = fuword32(&m->m_flags); 2165161678Sdavidxu if (flags == -1) 2166161678Sdavidxu return (EFAULT); 2167161678Sdavidxu 2168162030Sdavidxu if (timeout == NULL) { 2169162030Sdavidxu error = _do_lock_umutex(td, m, flags, 0, try); 2170162030Sdavidxu /* Mutex locking is restarted if it is interrupted. */ 2171162030Sdavidxu if (error == EINTR) 2172162030Sdavidxu error = ERESTART; 2173162030Sdavidxu } else { 2174162030Sdavidxu getnanouptime(&ts); 2175162030Sdavidxu timespecadd(&ts, timeout); 2176162030Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 2177162030Sdavidxu for (;;) { 2178162030Sdavidxu error = _do_lock_umutex(td, m, flags, tvtohz(&tv), try); 2179162030Sdavidxu if (error != ETIMEDOUT) 2180162030Sdavidxu break; 2181162030Sdavidxu getnanouptime(&ts2); 2182162030Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 2183162030Sdavidxu error = ETIMEDOUT; 2184162030Sdavidxu break; 2185162030Sdavidxu } 2186162030Sdavidxu ts3 = ts; 2187162030Sdavidxu timespecsub(&ts3, &ts2); 2188162030Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 2189162030Sdavidxu } 2190162030Sdavidxu /* Timed-locking is not restarted. */ 2191162030Sdavidxu if (error == ERESTART) 2192162030Sdavidxu error = EINTR; 2193161742Sdavidxu } 2194162030Sdavidxu return (error); 2195161678Sdavidxu} 2196161678Sdavidxu 2197161678Sdavidxu/* 2198161678Sdavidxu * Unlock a userland POSIX mutex. 2199161678Sdavidxu */ 2200161678Sdavidxustatic int 2201161678Sdavidxudo_unlock_umutex(struct thread *td, struct umutex *m) 2202161678Sdavidxu{ 2203161678Sdavidxu uint32_t flags; 2204161678Sdavidxu 2205161678Sdavidxu flags = fuword32(&m->m_flags); 2206161678Sdavidxu if (flags == -1) 2207161678Sdavidxu return (EFAULT); 2208161678Sdavidxu 2209161855Sdavidxu switch(flags & (UMUTEX_PRIO_INHERIT | UMUTEX_PRIO_PROTECT)) { 2210161855Sdavidxu case 0: 2211161855Sdavidxu return (do_unlock_normal(td, m, flags)); 2212161855Sdavidxu case UMUTEX_PRIO_INHERIT: 2213161855Sdavidxu return (do_unlock_pi(td, m, flags)); 2214161855Sdavidxu case UMUTEX_PRIO_PROTECT: 2215161855Sdavidxu return (do_unlock_pp(td, m, flags)); 2216161855Sdavidxu } 2217161678Sdavidxu 2218161855Sdavidxu return (EINVAL); 2219161678Sdavidxu} 2220161678Sdavidxu 2221164839Sdavidxustatic int 2222164839Sdavidxudo_cv_wait(struct thread *td, struct ucond *cv, struct umutex *m, 2223164876Sdavidxu struct timespec *timeout, u_long wflags) 2224164839Sdavidxu{ 2225164839Sdavidxu struct umtx_q *uq; 2226164839Sdavidxu struct timeval tv; 2227164839Sdavidxu struct timespec cts, ets, tts; 2228164839Sdavidxu uint32_t flags; 2229164839Sdavidxu int error; 2230164839Sdavidxu 2231164839Sdavidxu uq = td->td_umtxq; 2232164839Sdavidxu flags = fuword32(&cv->c_flags); 2233164839Sdavidxu error = umtx_key_get(cv, TYPE_CV, GET_SHARE(flags), &uq->uq_key); 2234164839Sdavidxu if (error != 0) 2235164839Sdavidxu return (error); 2236164839Sdavidxu umtxq_lock(&uq->uq_key); 2237164839Sdavidxu umtxq_busy(&uq->uq_key); 2238164839Sdavidxu umtxq_insert(uq); 2239164839Sdavidxu umtxq_unlock(&uq->uq_key); 2240164839Sdavidxu 2241164839Sdavidxu /* 2242164839Sdavidxu * The magic thing is we should set c_has_waiters to 1 before 2243164839Sdavidxu * releasing user mutex. 2244164839Sdavidxu */ 2245164839Sdavidxu suword32(__DEVOLATILE(uint32_t *, &cv->c_has_waiters), 1); 2246164839Sdavidxu 2247164839Sdavidxu umtxq_lock(&uq->uq_key); 2248164839Sdavidxu umtxq_unbusy(&uq->uq_key); 2249164839Sdavidxu umtxq_unlock(&uq->uq_key); 2250164839Sdavidxu 2251164839Sdavidxu error = do_unlock_umutex(td, m); 2252164839Sdavidxu 2253164839Sdavidxu umtxq_lock(&uq->uq_key); 2254164839Sdavidxu if (error == 0) { 2255164876Sdavidxu if ((wflags & UMTX_CHECK_UNPARKING) && 2256164876Sdavidxu (td->td_pflags & TDP_WAKEUP)) { 2257164876Sdavidxu td->td_pflags &= ~TDP_WAKEUP; 2258164876Sdavidxu error = EINTR; 2259164876Sdavidxu } else if (timeout == NULL) { 2260164839Sdavidxu error = umtxq_sleep(uq, "ucond", 0); 2261164839Sdavidxu } else { 2262164839Sdavidxu getnanouptime(&ets); 2263164839Sdavidxu timespecadd(&ets, timeout); 2264164839Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 2265164839Sdavidxu for (;;) { 2266164839Sdavidxu error = umtxq_sleep(uq, "ucond", tvtohz(&tv)); 2267164839Sdavidxu if (error != ETIMEDOUT) 2268164839Sdavidxu break; 2269164839Sdavidxu getnanouptime(&cts); 2270164839Sdavidxu if (timespeccmp(&cts, &ets, >=)) { 2271164839Sdavidxu error = ETIMEDOUT; 2272164839Sdavidxu break; 2273164839Sdavidxu } 2274164839Sdavidxu tts = ets; 2275164839Sdavidxu timespecsub(&tts, &cts); 2276164839Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &tts); 2277164839Sdavidxu } 2278164839Sdavidxu } 2279164839Sdavidxu } 2280164839Sdavidxu 2281164839Sdavidxu if (error != 0) { 2282164839Sdavidxu if ((uq->uq_flags & UQF_UMTXQ) == 0) { 2283164839Sdavidxu /* 2284164839Sdavidxu * If we concurrently got do_cv_signal()d 2285164839Sdavidxu * and we got an error or UNIX signals or a timeout, 2286164839Sdavidxu * then, perform another umtxq_signal to avoid 2287164839Sdavidxu * consuming the wakeup. This may cause supurious 2288164839Sdavidxu * wakeup for another thread which was just queued, 2289164839Sdavidxu * but SUSV3 explicitly allows supurious wakeup to 2290164839Sdavidxu * occur, and indeed a kernel based implementation 2291164839Sdavidxu * can not avoid it. 2292164839Sdavidxu */ 2293164876Sdavidxu if (!umtxq_signal(&uq->uq_key, 1)) 2294164876Sdavidxu error = 0; 2295164839Sdavidxu } 2296164839Sdavidxu if (error == ERESTART) 2297164839Sdavidxu error = EINTR; 2298164839Sdavidxu } 2299164839Sdavidxu umtxq_remove(uq); 2300164839Sdavidxu umtxq_unlock(&uq->uq_key); 2301164839Sdavidxu umtx_key_release(&uq->uq_key); 2302164839Sdavidxu return (error); 2303164839Sdavidxu} 2304164839Sdavidxu 2305164839Sdavidxu/* 2306164839Sdavidxu * Signal a userland condition variable. 2307164839Sdavidxu */ 2308164839Sdavidxustatic int 2309164839Sdavidxudo_cv_signal(struct thread *td, struct ucond *cv) 2310164839Sdavidxu{ 2311164839Sdavidxu struct umtx_key key; 2312164839Sdavidxu int error, cnt, nwake; 2313164839Sdavidxu uint32_t flags; 2314164839Sdavidxu 2315164839Sdavidxu flags = fuword32(&cv->c_flags); 2316164839Sdavidxu if ((error = umtx_key_get(cv, TYPE_CV, GET_SHARE(flags), &key)) != 0) 2317164839Sdavidxu return (error); 2318164839Sdavidxu umtxq_lock(&key); 2319164839Sdavidxu umtxq_busy(&key); 2320164839Sdavidxu cnt = umtxq_count(&key); 2321164839Sdavidxu nwake = umtxq_signal(&key, 1); 2322164839Sdavidxu if (cnt <= nwake) { 2323164839Sdavidxu umtxq_unlock(&key); 2324164839Sdavidxu error = suword32( 2325164839Sdavidxu __DEVOLATILE(uint32_t *, &cv->c_has_waiters), 0); 2326164839Sdavidxu umtxq_lock(&key); 2327164839Sdavidxu } 2328164839Sdavidxu umtxq_unbusy(&key); 2329164839Sdavidxu umtxq_unlock(&key); 2330164839Sdavidxu umtx_key_release(&key); 2331164839Sdavidxu return (error); 2332164839Sdavidxu} 2333164839Sdavidxu 2334164839Sdavidxustatic int 2335164839Sdavidxudo_cv_broadcast(struct thread *td, struct ucond *cv) 2336164839Sdavidxu{ 2337164839Sdavidxu struct umtx_key key; 2338164839Sdavidxu int error; 2339164839Sdavidxu uint32_t flags; 2340164839Sdavidxu 2341164839Sdavidxu flags = fuword32(&cv->c_flags); 2342164839Sdavidxu if ((error = umtx_key_get(cv, TYPE_CV, GET_SHARE(flags), &key)) != 0) 2343164839Sdavidxu return (error); 2344164839Sdavidxu 2345164839Sdavidxu umtxq_lock(&key); 2346164839Sdavidxu umtxq_busy(&key); 2347164839Sdavidxu umtxq_signal(&key, INT_MAX); 2348164839Sdavidxu umtxq_unlock(&key); 2349164839Sdavidxu 2350164839Sdavidxu error = suword32(__DEVOLATILE(uint32_t *, &cv->c_has_waiters), 0); 2351164839Sdavidxu 2352164839Sdavidxu umtxq_lock(&key); 2353164839Sdavidxu umtxq_unbusy(&key); 2354164839Sdavidxu umtxq_unlock(&key); 2355164839Sdavidxu 2356164839Sdavidxu umtx_key_release(&key); 2357164839Sdavidxu return (error); 2358164839Sdavidxu} 2359164839Sdavidxu 2360177848Sdavidxustatic int 2361177848Sdavidxudo_rw_rdlock(struct thread *td, struct urwlock *rwlock, long fflag, int timo) 2362177848Sdavidxu{ 2363177848Sdavidxu struct umtx_q *uq; 2364177848Sdavidxu uint32_t flags, wrflags; 2365177848Sdavidxu int32_t state, oldstate; 2366177848Sdavidxu int32_t blocked_readers; 2367177848Sdavidxu int error; 2368177848Sdavidxu 2369177848Sdavidxu uq = td->td_umtxq; 2370177848Sdavidxu flags = fuword32(&rwlock->rw_flags); 2371177848Sdavidxu error = umtx_key_get(rwlock, TYPE_RWLOCK, GET_SHARE(flags), &uq->uq_key); 2372177848Sdavidxu if (error != 0) 2373177848Sdavidxu return (error); 2374177848Sdavidxu 2375177848Sdavidxu wrflags = URWLOCK_WRITE_OWNER; 2376177848Sdavidxu if (!(fflag & URWLOCK_PREFER_READER) && !(flags & URWLOCK_PREFER_READER)) 2377177848Sdavidxu wrflags |= URWLOCK_WRITE_WAITERS; 2378177848Sdavidxu 2379177848Sdavidxu for (;;) { 2380177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2381177848Sdavidxu /* try to lock it */ 2382177848Sdavidxu while (!(state & wrflags)) { 2383177848Sdavidxu if (__predict_false(URWLOCK_READER_COUNT(state) == URWLOCK_MAX_READERS)) { 2384177848Sdavidxu umtx_key_release(&uq->uq_key); 2385177848Sdavidxu return (EAGAIN); 2386177848Sdavidxu } 2387177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, state + 1); 2388177848Sdavidxu if (oldstate == state) { 2389177848Sdavidxu umtx_key_release(&uq->uq_key); 2390177848Sdavidxu return (0); 2391177848Sdavidxu } 2392177848Sdavidxu state = oldstate; 2393177848Sdavidxu } 2394177848Sdavidxu 2395177848Sdavidxu if (error) 2396177848Sdavidxu break; 2397177848Sdavidxu 2398177848Sdavidxu /* grab monitor lock */ 2399177848Sdavidxu umtxq_lock(&uq->uq_key); 2400177848Sdavidxu umtxq_busy(&uq->uq_key); 2401177848Sdavidxu umtxq_unlock(&uq->uq_key); 2402177848Sdavidxu 2403177848Sdavidxu /* set read contention bit */ 2404177848Sdavidxu while ((state & wrflags) && !(state & URWLOCK_READ_WAITERS)) { 2405177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, state | URWLOCK_READ_WAITERS); 2406177848Sdavidxu if (oldstate == state) 2407177848Sdavidxu goto sleep; 2408177848Sdavidxu state = oldstate; 2409177848Sdavidxu } 2410177848Sdavidxu 2411177848Sdavidxu /* state is changed while setting flags, restart */ 2412177848Sdavidxu if (!(state & wrflags)) { 2413177848Sdavidxu umtxq_lock(&uq->uq_key); 2414177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2415177848Sdavidxu umtxq_unlock(&uq->uq_key); 2416177848Sdavidxu continue; 2417177848Sdavidxu } 2418177848Sdavidxu 2419177848Sdavidxusleep: 2420177848Sdavidxu /* contention bit is set, before sleeping, increase read waiter count */ 2421177848Sdavidxu blocked_readers = fuword32(&rwlock->rw_blocked_readers); 2422177848Sdavidxu suword32(&rwlock->rw_blocked_readers, blocked_readers+1); 2423177848Sdavidxu 2424177848Sdavidxu while (state & wrflags) { 2425177848Sdavidxu umtxq_lock(&uq->uq_key); 2426177848Sdavidxu umtxq_insert(uq); 2427177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2428177848Sdavidxu 2429177848Sdavidxu error = umtxq_sleep(uq, "urdlck", timo); 2430177848Sdavidxu 2431177848Sdavidxu umtxq_busy(&uq->uq_key); 2432177848Sdavidxu umtxq_remove(uq); 2433177848Sdavidxu umtxq_unlock(&uq->uq_key); 2434177848Sdavidxu if (error) 2435177848Sdavidxu break; 2436177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2437177848Sdavidxu } 2438177848Sdavidxu 2439177848Sdavidxu /* decrease read waiter count, and may clear read contention bit */ 2440177848Sdavidxu blocked_readers = fuword32(&rwlock->rw_blocked_readers); 2441177848Sdavidxu suword32(&rwlock->rw_blocked_readers, blocked_readers-1); 2442177848Sdavidxu if (blocked_readers == 1) { 2443177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2444177848Sdavidxu for (;;) { 2445177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, 2446177848Sdavidxu state & ~URWLOCK_READ_WAITERS); 2447177848Sdavidxu if (oldstate == state) 2448177848Sdavidxu break; 2449177848Sdavidxu state = oldstate; 2450177848Sdavidxu } 2451177848Sdavidxu } 2452177848Sdavidxu 2453177848Sdavidxu umtxq_lock(&uq->uq_key); 2454177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2455177848Sdavidxu umtxq_unlock(&uq->uq_key); 2456177848Sdavidxu } 2457177848Sdavidxu umtx_key_release(&uq->uq_key); 2458177848Sdavidxu return (error); 2459177848Sdavidxu} 2460177848Sdavidxu 2461177848Sdavidxustatic int 2462177848Sdavidxudo_rw_rdlock2(struct thread *td, void *obj, long val, struct timespec *timeout) 2463177848Sdavidxu{ 2464177848Sdavidxu struct timespec ts, ts2, ts3; 2465177848Sdavidxu struct timeval tv; 2466177848Sdavidxu int error; 2467177848Sdavidxu 2468177848Sdavidxu getnanouptime(&ts); 2469177848Sdavidxu timespecadd(&ts, timeout); 2470177848Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 2471177848Sdavidxu for (;;) { 2472177848Sdavidxu error = do_rw_rdlock(td, obj, val, tvtohz(&tv)); 2473177848Sdavidxu if (error != ETIMEDOUT) 2474177848Sdavidxu break; 2475177848Sdavidxu getnanouptime(&ts2); 2476177848Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 2477177848Sdavidxu error = ETIMEDOUT; 2478177848Sdavidxu break; 2479177848Sdavidxu } 2480177848Sdavidxu ts3 = ts; 2481177848Sdavidxu timespecsub(&ts3, &ts2); 2482177848Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 2483177848Sdavidxu } 2484177849Sdavidxu if (error == ERESTART) 2485177849Sdavidxu error = EINTR; 2486177848Sdavidxu return (error); 2487177848Sdavidxu} 2488177848Sdavidxu 2489177848Sdavidxustatic int 2490177848Sdavidxudo_rw_wrlock(struct thread *td, struct urwlock *rwlock, int timo) 2491177848Sdavidxu{ 2492177848Sdavidxu struct umtx_q *uq; 2493177848Sdavidxu uint32_t flags; 2494177848Sdavidxu int32_t state, oldstate; 2495177848Sdavidxu int32_t blocked_writers; 2496177848Sdavidxu int error; 2497177848Sdavidxu 2498177848Sdavidxu uq = td->td_umtxq; 2499177848Sdavidxu flags = fuword32(&rwlock->rw_flags); 2500177848Sdavidxu error = umtx_key_get(rwlock, TYPE_RWLOCK, GET_SHARE(flags), &uq->uq_key); 2501177848Sdavidxu if (error != 0) 2502177848Sdavidxu return (error); 2503177848Sdavidxu 2504177848Sdavidxu for (;;) { 2505177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2506177848Sdavidxu while (!(state & URWLOCK_WRITE_OWNER) && URWLOCK_READER_COUNT(state) == 0) { 2507177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, state | URWLOCK_WRITE_OWNER); 2508177848Sdavidxu if (oldstate == state) { 2509177848Sdavidxu umtx_key_release(&uq->uq_key); 2510177848Sdavidxu return (0); 2511177848Sdavidxu } 2512177848Sdavidxu state = oldstate; 2513177848Sdavidxu } 2514177848Sdavidxu 2515177848Sdavidxu if (error) 2516177848Sdavidxu break; 2517177848Sdavidxu 2518177848Sdavidxu /* grab monitor lock */ 2519177848Sdavidxu umtxq_lock(&uq->uq_key); 2520177848Sdavidxu umtxq_busy(&uq->uq_key); 2521177848Sdavidxu umtxq_unlock(&uq->uq_key); 2522177848Sdavidxu 2523177848Sdavidxu while (((state & URWLOCK_WRITE_OWNER) || URWLOCK_READER_COUNT(state) != 0) && 2524177848Sdavidxu (state & URWLOCK_WRITE_WAITERS) == 0) { 2525177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, state | URWLOCK_WRITE_WAITERS); 2526177848Sdavidxu if (oldstate == state) 2527177848Sdavidxu goto sleep; 2528177848Sdavidxu state = oldstate; 2529177848Sdavidxu } 2530177848Sdavidxu 2531177848Sdavidxu if (!(state & URWLOCK_WRITE_OWNER) && URWLOCK_READER_COUNT(state) == 0) { 2532177848Sdavidxu umtxq_lock(&uq->uq_key); 2533177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2534177848Sdavidxu umtxq_unlock(&uq->uq_key); 2535177848Sdavidxu continue; 2536177848Sdavidxu } 2537177848Sdavidxusleep: 2538177848Sdavidxu blocked_writers = fuword32(&rwlock->rw_blocked_writers); 2539177848Sdavidxu suword32(&rwlock->rw_blocked_writers, blocked_writers+1); 2540177848Sdavidxu 2541177848Sdavidxu while ((state & URWLOCK_WRITE_OWNER) || URWLOCK_READER_COUNT(state) != 0) { 2542177848Sdavidxu umtxq_lock(&uq->uq_key); 2543177848Sdavidxu umtxq_insert_queue(uq, UMTX_EXCLUSIVE_QUEUE); 2544177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2545177848Sdavidxu 2546177848Sdavidxu error = umtxq_sleep(uq, "uwrlck", timo); 2547177848Sdavidxu 2548177848Sdavidxu umtxq_busy(&uq->uq_key); 2549177848Sdavidxu umtxq_remove_queue(uq, UMTX_EXCLUSIVE_QUEUE); 2550177848Sdavidxu umtxq_unlock(&uq->uq_key); 2551177848Sdavidxu if (error) 2552177848Sdavidxu break; 2553177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2554177848Sdavidxu } 2555177848Sdavidxu 2556177848Sdavidxu blocked_writers = fuword32(&rwlock->rw_blocked_writers); 2557177848Sdavidxu suword32(&rwlock->rw_blocked_writers, blocked_writers-1); 2558177848Sdavidxu if (blocked_writers == 1) { 2559177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2560177848Sdavidxu for (;;) { 2561177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, 2562177848Sdavidxu state & ~URWLOCK_WRITE_WAITERS); 2563177848Sdavidxu if (oldstate == state) 2564177848Sdavidxu break; 2565177848Sdavidxu state = oldstate; 2566177848Sdavidxu } 2567177848Sdavidxu } 2568177848Sdavidxu 2569177848Sdavidxu umtxq_lock(&uq->uq_key); 2570177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2571177848Sdavidxu umtxq_unlock(&uq->uq_key); 2572177848Sdavidxu } 2573177848Sdavidxu 2574177848Sdavidxu umtx_key_release(&uq->uq_key); 2575177848Sdavidxu return (error); 2576177848Sdavidxu} 2577177848Sdavidxu 2578177848Sdavidxustatic int 2579177848Sdavidxudo_rw_wrlock2(struct thread *td, void *obj, struct timespec *timeout) 2580177848Sdavidxu{ 2581177848Sdavidxu struct timespec ts, ts2, ts3; 2582177848Sdavidxu struct timeval tv; 2583177848Sdavidxu int error; 2584177848Sdavidxu 2585177848Sdavidxu getnanouptime(&ts); 2586177848Sdavidxu timespecadd(&ts, timeout); 2587177848Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, timeout); 2588177848Sdavidxu for (;;) { 2589177848Sdavidxu error = do_rw_wrlock(td, obj, tvtohz(&tv)); 2590177848Sdavidxu if (error != ETIMEDOUT) 2591177848Sdavidxu break; 2592177848Sdavidxu getnanouptime(&ts2); 2593177848Sdavidxu if (timespeccmp(&ts2, &ts, >=)) { 2594177848Sdavidxu error = ETIMEDOUT; 2595177848Sdavidxu break; 2596177848Sdavidxu } 2597177848Sdavidxu ts3 = ts; 2598177848Sdavidxu timespecsub(&ts3, &ts2); 2599177848Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 2600177848Sdavidxu } 2601177849Sdavidxu if (error == ERESTART) 2602177849Sdavidxu error = EINTR; 2603177848Sdavidxu return (error); 2604177848Sdavidxu} 2605177848Sdavidxu 2606177848Sdavidxustatic int 2607177848Sdavidxudo_rwlock_unlock(struct thread *td, struct urwlock *rwlock) 2608177848Sdavidxu{ 2609177848Sdavidxu struct umtx_q *uq; 2610177848Sdavidxu uint32_t flags; 2611177848Sdavidxu int32_t state, oldstate; 2612177848Sdavidxu int error, q, count; 2613177848Sdavidxu 2614177848Sdavidxu uq = td->td_umtxq; 2615177848Sdavidxu flags = fuword32(&rwlock->rw_flags); 2616177848Sdavidxu error = umtx_key_get(rwlock, TYPE_RWLOCK, GET_SHARE(flags), &uq->uq_key); 2617177848Sdavidxu if (error != 0) 2618177848Sdavidxu return (error); 2619177848Sdavidxu 2620177848Sdavidxu state = fuword32(__DEVOLATILE(int32_t *, &rwlock->rw_state)); 2621177848Sdavidxu if (state & URWLOCK_WRITE_OWNER) { 2622177848Sdavidxu for (;;) { 2623177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, 2624177848Sdavidxu state & ~URWLOCK_WRITE_OWNER); 2625177848Sdavidxu if (oldstate != state) { 2626177848Sdavidxu state = oldstate; 2627177848Sdavidxu if (!(oldstate & URWLOCK_WRITE_OWNER)) { 2628177848Sdavidxu error = EPERM; 2629177848Sdavidxu goto out; 2630177848Sdavidxu } 2631177848Sdavidxu } else 2632177848Sdavidxu break; 2633177848Sdavidxu } 2634177848Sdavidxu } else if (URWLOCK_READER_COUNT(state) != 0) { 2635177848Sdavidxu for (;;) { 2636177848Sdavidxu oldstate = casuword32(&rwlock->rw_state, state, 2637177848Sdavidxu state - 1); 2638177848Sdavidxu if (oldstate != state) { 2639177848Sdavidxu state = oldstate; 2640177848Sdavidxu if (URWLOCK_READER_COUNT(oldstate) == 0) { 2641177848Sdavidxu error = EPERM; 2642177848Sdavidxu goto out; 2643177848Sdavidxu } 2644177848Sdavidxu } 2645177848Sdavidxu else 2646177848Sdavidxu break; 2647177848Sdavidxu } 2648177848Sdavidxu } else { 2649177848Sdavidxu error = EPERM; 2650177848Sdavidxu goto out; 2651177848Sdavidxu } 2652177848Sdavidxu 2653177848Sdavidxu count = 0; 2654177848Sdavidxu 2655177848Sdavidxu if (!(flags & URWLOCK_PREFER_READER)) { 2656177848Sdavidxu if (state & URWLOCK_WRITE_WAITERS) { 2657177848Sdavidxu count = 1; 2658177848Sdavidxu q = UMTX_EXCLUSIVE_QUEUE; 2659177848Sdavidxu } else if (state & URWLOCK_READ_WAITERS) { 2660177848Sdavidxu count = INT_MAX; 2661177848Sdavidxu q = UMTX_SHARED_QUEUE; 2662177848Sdavidxu } 2663177848Sdavidxu } else { 2664177848Sdavidxu if (state & URWLOCK_READ_WAITERS) { 2665177848Sdavidxu count = INT_MAX; 2666177848Sdavidxu q = UMTX_SHARED_QUEUE; 2667177848Sdavidxu } else if (state & URWLOCK_WRITE_WAITERS) { 2668177848Sdavidxu count = 1; 2669177848Sdavidxu q = UMTX_EXCLUSIVE_QUEUE; 2670177848Sdavidxu } 2671177848Sdavidxu } 2672177848Sdavidxu 2673177848Sdavidxu if (count) { 2674177848Sdavidxu umtxq_lock(&uq->uq_key); 2675177848Sdavidxu umtxq_busy(&uq->uq_key); 2676177848Sdavidxu umtxq_signal_queue(&uq->uq_key, count, q); 2677177848Sdavidxu umtxq_unbusy(&uq->uq_key); 2678177848Sdavidxu umtxq_unlock(&uq->uq_key); 2679177848Sdavidxu } 2680177848Sdavidxuout: 2681177848Sdavidxu umtx_key_release(&uq->uq_key); 2682177848Sdavidxu return (error); 2683177848Sdavidxu} 2684177848Sdavidxu 2685139013Sdavidxuint 2686139013Sdavidxu_umtx_lock(struct thread *td, struct _umtx_lock_args *uap) 2687139013Sdavidxu /* struct umtx *umtx */ 2688139013Sdavidxu{ 2689162536Sdavidxu return _do_lock_umtx(td, uap->umtx, td->td_tid, 0); 2690139013Sdavidxu} 2691139013Sdavidxu 2692139013Sdavidxuint 2693139013Sdavidxu_umtx_unlock(struct thread *td, struct _umtx_unlock_args *uap) 2694139013Sdavidxu /* struct umtx *umtx */ 2695139013Sdavidxu{ 2696162536Sdavidxu return do_unlock_umtx(td, uap->umtx, td->td_tid); 2697139013Sdavidxu} 2698139013Sdavidxu 2699162536Sdavidxustatic int 2700162536Sdavidxu__umtx_op_lock_umtx(struct thread *td, struct _umtx_op_args *uap) 2701139013Sdavidxu{ 2702162536Sdavidxu struct timespec *ts, timeout; 2703139013Sdavidxu int error; 2704139013Sdavidxu 2705162536Sdavidxu /* Allow a null timespec (wait forever). */ 2706162536Sdavidxu if (uap->uaddr2 == NULL) 2707162536Sdavidxu ts = NULL; 2708162536Sdavidxu else { 2709162536Sdavidxu error = copyin(uap->uaddr2, &timeout, sizeof(timeout)); 2710162536Sdavidxu if (error != 0) 2711162536Sdavidxu return (error); 2712162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2713162536Sdavidxu timeout.tv_nsec < 0) { 2714162536Sdavidxu return (EINVAL); 2715161678Sdavidxu } 2716162536Sdavidxu ts = &timeout; 2717162536Sdavidxu } 2718162536Sdavidxu return (do_lock_umtx(td, uap->obj, uap->val, ts)); 2719162536Sdavidxu} 2720162536Sdavidxu 2721162536Sdavidxustatic int 2722162536Sdavidxu__umtx_op_unlock_umtx(struct thread *td, struct _umtx_op_args *uap) 2723162536Sdavidxu{ 2724162536Sdavidxu return (do_unlock_umtx(td, uap->obj, uap->val)); 2725162536Sdavidxu} 2726162536Sdavidxu 2727162536Sdavidxustatic int 2728162536Sdavidxu__umtx_op_wait(struct thread *td, struct _umtx_op_args *uap) 2729162536Sdavidxu{ 2730162536Sdavidxu struct timespec *ts, timeout; 2731162536Sdavidxu int error; 2732162536Sdavidxu 2733162536Sdavidxu if (uap->uaddr2 == NULL) 2734162536Sdavidxu ts = NULL; 2735162536Sdavidxu else { 2736162536Sdavidxu error = copyin(uap->uaddr2, &timeout, sizeof(timeout)); 2737162536Sdavidxu if (error != 0) 2738162536Sdavidxu return (error); 2739162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2740162536Sdavidxu timeout.tv_nsec < 0) 2741162536Sdavidxu return (EINVAL); 2742162536Sdavidxu ts = &timeout; 2743162536Sdavidxu } 2744162536Sdavidxu return do_wait(td, uap->obj, uap->val, ts, 0); 2745162536Sdavidxu} 2746162536Sdavidxu 2747162536Sdavidxustatic int 2748173800Sdavidxu__umtx_op_wait_uint(struct thread *td, struct _umtx_op_args *uap) 2749173800Sdavidxu{ 2750173800Sdavidxu struct timespec *ts, timeout; 2751173800Sdavidxu int error; 2752173800Sdavidxu 2753173800Sdavidxu if (uap->uaddr2 == NULL) 2754173800Sdavidxu ts = NULL; 2755173800Sdavidxu else { 2756173800Sdavidxu error = copyin(uap->uaddr2, &timeout, sizeof(timeout)); 2757173800Sdavidxu if (error != 0) 2758173800Sdavidxu return (error); 2759173800Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2760173800Sdavidxu timeout.tv_nsec < 0) 2761173800Sdavidxu return (EINVAL); 2762173800Sdavidxu ts = &timeout; 2763173800Sdavidxu } 2764173800Sdavidxu return do_wait(td, uap->obj, uap->val, ts, 1); 2765173800Sdavidxu} 2766173800Sdavidxu 2767173800Sdavidxustatic int 2768162536Sdavidxu__umtx_op_wake(struct thread *td, struct _umtx_op_args *uap) 2769162536Sdavidxu{ 2770162536Sdavidxu return (kern_umtx_wake(td, uap->obj, uap->val)); 2771162536Sdavidxu} 2772162536Sdavidxu 2773162536Sdavidxustatic int 2774162536Sdavidxu__umtx_op_lock_umutex(struct thread *td, struct _umtx_op_args *uap) 2775162536Sdavidxu{ 2776162536Sdavidxu struct timespec *ts, timeout; 2777162536Sdavidxu int error; 2778162536Sdavidxu 2779162536Sdavidxu /* Allow a null timespec (wait forever). */ 2780162536Sdavidxu if (uap->uaddr2 == NULL) 2781162536Sdavidxu ts = NULL; 2782162536Sdavidxu else { 2783162536Sdavidxu error = copyin(uap->uaddr2, &timeout, 2784162536Sdavidxu sizeof(timeout)); 2785162536Sdavidxu if (error != 0) 2786162536Sdavidxu return (error); 2787162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2788162536Sdavidxu timeout.tv_nsec < 0) { 2789162536Sdavidxu return (EINVAL); 2790139013Sdavidxu } 2791162536Sdavidxu ts = &timeout; 2792139013Sdavidxu } 2793162536Sdavidxu return do_lock_umutex(td, uap->obj, ts, 0); 2794162536Sdavidxu} 2795162536Sdavidxu 2796162536Sdavidxustatic int 2797162536Sdavidxu__umtx_op_trylock_umutex(struct thread *td, struct _umtx_op_args *uap) 2798162536Sdavidxu{ 2799162536Sdavidxu return do_lock_umutex(td, uap->obj, NULL, 1); 2800162536Sdavidxu} 2801162536Sdavidxu 2802162536Sdavidxustatic int 2803162536Sdavidxu__umtx_op_unlock_umutex(struct thread *td, struct _umtx_op_args *uap) 2804162536Sdavidxu{ 2805162536Sdavidxu return do_unlock_umutex(td, uap->obj); 2806162536Sdavidxu} 2807162536Sdavidxu 2808162536Sdavidxustatic int 2809162536Sdavidxu__umtx_op_set_ceiling(struct thread *td, struct _umtx_op_args *uap) 2810162536Sdavidxu{ 2811162536Sdavidxu return do_set_ceiling(td, uap->obj, uap->val, uap->uaddr1); 2812162536Sdavidxu} 2813162536Sdavidxu 2814164839Sdavidxustatic int 2815164839Sdavidxu__umtx_op_cv_wait(struct thread *td, struct _umtx_op_args *uap) 2816164839Sdavidxu{ 2817164839Sdavidxu struct timespec *ts, timeout; 2818164839Sdavidxu int error; 2819164839Sdavidxu 2820164839Sdavidxu /* Allow a null timespec (wait forever). */ 2821164839Sdavidxu if (uap->uaddr2 == NULL) 2822164839Sdavidxu ts = NULL; 2823164839Sdavidxu else { 2824164839Sdavidxu error = copyin(uap->uaddr2, &timeout, 2825164839Sdavidxu sizeof(timeout)); 2826164839Sdavidxu if (error != 0) 2827164839Sdavidxu return (error); 2828164839Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2829164839Sdavidxu timeout.tv_nsec < 0) { 2830164839Sdavidxu return (EINVAL); 2831164839Sdavidxu } 2832164839Sdavidxu ts = &timeout; 2833164839Sdavidxu } 2834164876Sdavidxu return (do_cv_wait(td, uap->obj, uap->uaddr1, ts, uap->val)); 2835164839Sdavidxu} 2836164839Sdavidxu 2837164839Sdavidxustatic int 2838164839Sdavidxu__umtx_op_cv_signal(struct thread *td, struct _umtx_op_args *uap) 2839164839Sdavidxu{ 2840164839Sdavidxu return do_cv_signal(td, uap->obj); 2841164839Sdavidxu} 2842164839Sdavidxu 2843164839Sdavidxustatic int 2844164839Sdavidxu__umtx_op_cv_broadcast(struct thread *td, struct _umtx_op_args *uap) 2845164839Sdavidxu{ 2846164839Sdavidxu return do_cv_broadcast(td, uap->obj); 2847164839Sdavidxu} 2848164839Sdavidxu 2849177848Sdavidxustatic int 2850177848Sdavidxu__umtx_op_rw_rdlock(struct thread *td, struct _umtx_op_args *uap) 2851177848Sdavidxu{ 2852177848Sdavidxu struct timespec timeout; 2853177848Sdavidxu int error; 2854177848Sdavidxu 2855177848Sdavidxu /* Allow a null timespec (wait forever). */ 2856177848Sdavidxu if (uap->uaddr2 == NULL) { 2857177848Sdavidxu error = do_rw_rdlock(td, uap->obj, uap->val, 0); 2858177848Sdavidxu } else { 2859177848Sdavidxu error = copyin(uap->uaddr2, &timeout, 2860177848Sdavidxu sizeof(timeout)); 2861177848Sdavidxu if (error != 0) 2862177848Sdavidxu return (error); 2863177848Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2864177848Sdavidxu timeout.tv_nsec < 0) { 2865177848Sdavidxu return (EINVAL); 2866177848Sdavidxu } 2867177848Sdavidxu error = do_rw_rdlock2(td, uap->obj, uap->val, &timeout); 2868177848Sdavidxu } 2869177848Sdavidxu return (error); 2870177848Sdavidxu} 2871177848Sdavidxu 2872177848Sdavidxustatic int 2873177848Sdavidxu__umtx_op_rw_wrlock(struct thread *td, struct _umtx_op_args *uap) 2874177848Sdavidxu{ 2875177848Sdavidxu struct timespec timeout; 2876177848Sdavidxu int error; 2877177848Sdavidxu 2878177848Sdavidxu /* Allow a null timespec (wait forever). */ 2879177848Sdavidxu if (uap->uaddr2 == NULL) { 2880177848Sdavidxu error = do_rw_wrlock(td, uap->obj, 0); 2881177848Sdavidxu } else { 2882177848Sdavidxu error = copyin(uap->uaddr2, &timeout, 2883177848Sdavidxu sizeof(timeout)); 2884177848Sdavidxu if (error != 0) 2885177848Sdavidxu return (error); 2886177848Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2887177848Sdavidxu timeout.tv_nsec < 0) { 2888177848Sdavidxu return (EINVAL); 2889177848Sdavidxu } 2890177848Sdavidxu 2891177848Sdavidxu error = do_rw_wrlock2(td, uap->obj, &timeout); 2892177848Sdavidxu } 2893177848Sdavidxu return (error); 2894177848Sdavidxu} 2895177848Sdavidxu 2896177848Sdavidxustatic int 2897177848Sdavidxu__umtx_op_rw_unlock(struct thread *td, struct _umtx_op_args *uap) 2898177848Sdavidxu{ 2899177848Sdavidxu return do_rwlock_unlock(td, uap->obj); 2900177848Sdavidxu} 2901177848Sdavidxu 2902162536Sdavidxutypedef int (*_umtx_op_func)(struct thread *td, struct _umtx_op_args *uap); 2903162536Sdavidxu 2904162536Sdavidxustatic _umtx_op_func op_table[] = { 2905162536Sdavidxu __umtx_op_lock_umtx, /* UMTX_OP_LOCK */ 2906162536Sdavidxu __umtx_op_unlock_umtx, /* UMTX_OP_UNLOCK */ 2907162536Sdavidxu __umtx_op_wait, /* UMTX_OP_WAIT */ 2908162536Sdavidxu __umtx_op_wake, /* UMTX_OP_WAKE */ 2909162536Sdavidxu __umtx_op_trylock_umutex, /* UMTX_OP_MUTEX_TRYLOCK */ 2910162536Sdavidxu __umtx_op_lock_umutex, /* UMTX_OP_MUTEX_LOCK */ 2911162536Sdavidxu __umtx_op_unlock_umutex, /* UMTX_OP_MUTEX_UNLOCK */ 2912164839Sdavidxu __umtx_op_set_ceiling, /* UMTX_OP_SET_CEILING */ 2913164839Sdavidxu __umtx_op_cv_wait, /* UMTX_OP_CV_WAIT*/ 2914164839Sdavidxu __umtx_op_cv_signal, /* UMTX_OP_CV_SIGNAL */ 2915173800Sdavidxu __umtx_op_cv_broadcast, /* UMTX_OP_CV_BROADCAST */ 2916177848Sdavidxu __umtx_op_wait_uint, /* UMTX_OP_WAIT_UINT */ 2917177848Sdavidxu __umtx_op_rw_rdlock, /* UMTX_OP_RW_RDLOCK */ 2918177848Sdavidxu __umtx_op_rw_wrlock, /* UMTX_OP_RW_WRLOCK */ 2919177848Sdavidxu __umtx_op_rw_unlock /* UMTX_OP_RW_UNLOCK */ 2920162536Sdavidxu}; 2921162536Sdavidxu 2922162536Sdavidxuint 2923162536Sdavidxu_umtx_op(struct thread *td, struct _umtx_op_args *uap) 2924162536Sdavidxu{ 2925163678Sdavidxu if ((unsigned)uap->op < UMTX_OP_MAX) 2926162536Sdavidxu return (*op_table[uap->op])(td, uap); 2927162536Sdavidxu return (EINVAL); 2928162536Sdavidxu} 2929162536Sdavidxu 2930162536Sdavidxu#ifdef COMPAT_IA32 2931163046Sdavidxuint 2932163046Sdavidxufreebsd32_umtx_lock(struct thread *td, struct freebsd32_umtx_lock_args *uap) 2933163046Sdavidxu /* struct umtx *umtx */ 2934163046Sdavidxu{ 2935163046Sdavidxu return (do_lock_umtx32(td, (uint32_t *)uap->umtx, td->td_tid, NULL)); 2936163046Sdavidxu} 2937163046Sdavidxu 2938163046Sdavidxuint 2939163046Sdavidxufreebsd32_umtx_unlock(struct thread *td, struct freebsd32_umtx_unlock_args *uap) 2940163046Sdavidxu /* struct umtx *umtx */ 2941163046Sdavidxu{ 2942163046Sdavidxu return (do_unlock_umtx32(td, (uint32_t *)uap->umtx, td->td_tid)); 2943163046Sdavidxu} 2944163046Sdavidxu 2945162536Sdavidxustruct timespec32 { 2946162536Sdavidxu u_int32_t tv_sec; 2947162536Sdavidxu u_int32_t tv_nsec; 2948162536Sdavidxu}; 2949162536Sdavidxu 2950162536Sdavidxustatic inline int 2951162536Sdavidxucopyin_timeout32(void *addr, struct timespec *tsp) 2952162536Sdavidxu{ 2953162536Sdavidxu struct timespec32 ts32; 2954162536Sdavidxu int error; 2955162536Sdavidxu 2956162536Sdavidxu error = copyin(addr, &ts32, sizeof(struct timespec32)); 2957162536Sdavidxu if (error == 0) { 2958162536Sdavidxu tsp->tv_sec = ts32.tv_sec; 2959162536Sdavidxu tsp->tv_nsec = ts32.tv_nsec; 2960162536Sdavidxu } 2961140421Sdavidxu return (error); 2962139013Sdavidxu} 2963161678Sdavidxu 2964162536Sdavidxustatic int 2965162536Sdavidxu__umtx_op_lock_umtx_compat32(struct thread *td, struct _umtx_op_args *uap) 2966162536Sdavidxu{ 2967162536Sdavidxu struct timespec *ts, timeout; 2968162536Sdavidxu int error; 2969162536Sdavidxu 2970162536Sdavidxu /* Allow a null timespec (wait forever). */ 2971162536Sdavidxu if (uap->uaddr2 == NULL) 2972162536Sdavidxu ts = NULL; 2973162536Sdavidxu else { 2974162536Sdavidxu error = copyin_timeout32(uap->uaddr2, &timeout); 2975162536Sdavidxu if (error != 0) 2976162536Sdavidxu return (error); 2977162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 2978162536Sdavidxu timeout.tv_nsec < 0) { 2979162536Sdavidxu return (EINVAL); 2980162536Sdavidxu } 2981162536Sdavidxu ts = &timeout; 2982162536Sdavidxu } 2983162536Sdavidxu return (do_lock_umtx32(td, uap->obj, uap->val, ts)); 2984162536Sdavidxu} 2985162536Sdavidxu 2986162536Sdavidxustatic int 2987162536Sdavidxu__umtx_op_unlock_umtx_compat32(struct thread *td, struct _umtx_op_args *uap) 2988162536Sdavidxu{ 2989162536Sdavidxu return (do_unlock_umtx32(td, uap->obj, (uint32_t)uap->val)); 2990162536Sdavidxu} 2991162536Sdavidxu 2992162536Sdavidxustatic int 2993162536Sdavidxu__umtx_op_wait_compat32(struct thread *td, struct _umtx_op_args *uap) 2994162536Sdavidxu{ 2995162536Sdavidxu struct timespec *ts, timeout; 2996162536Sdavidxu int error; 2997162536Sdavidxu 2998162536Sdavidxu if (uap->uaddr2 == NULL) 2999162536Sdavidxu ts = NULL; 3000162536Sdavidxu else { 3001162536Sdavidxu error = copyin_timeout32(uap->uaddr2, &timeout); 3002162536Sdavidxu if (error != 0) 3003162536Sdavidxu return (error); 3004162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 3005162536Sdavidxu timeout.tv_nsec < 0) 3006162536Sdavidxu return (EINVAL); 3007162536Sdavidxu ts = &timeout; 3008162536Sdavidxu } 3009162536Sdavidxu return do_wait(td, uap->obj, uap->val, ts, 1); 3010162536Sdavidxu} 3011162536Sdavidxu 3012162536Sdavidxustatic int 3013162536Sdavidxu__umtx_op_lock_umutex_compat32(struct thread *td, struct _umtx_op_args *uap) 3014162536Sdavidxu{ 3015162536Sdavidxu struct timespec *ts, timeout; 3016162536Sdavidxu int error; 3017162536Sdavidxu 3018162536Sdavidxu /* Allow a null timespec (wait forever). */ 3019162536Sdavidxu if (uap->uaddr2 == NULL) 3020162536Sdavidxu ts = NULL; 3021162536Sdavidxu else { 3022162536Sdavidxu error = copyin_timeout32(uap->uaddr2, &timeout); 3023162536Sdavidxu if (error != 0) 3024162536Sdavidxu return (error); 3025162536Sdavidxu if (timeout.tv_nsec >= 1000000000 || 3026162536Sdavidxu timeout.tv_nsec < 0) 3027162536Sdavidxu return (EINVAL); 3028162536Sdavidxu ts = &timeout; 3029162536Sdavidxu } 3030162536Sdavidxu return do_lock_umutex(td, uap->obj, ts, 0); 3031162536Sdavidxu} 3032162536Sdavidxu 3033164839Sdavidxustatic int 3034164839Sdavidxu__umtx_op_cv_wait_compat32(struct thread *td, struct _umtx_op_args *uap) 3035164839Sdavidxu{ 3036164839Sdavidxu struct timespec *ts, timeout; 3037164839Sdavidxu int error; 3038164839Sdavidxu 3039164839Sdavidxu /* Allow a null timespec (wait forever). */ 3040164839Sdavidxu if (uap->uaddr2 == NULL) 3041164839Sdavidxu ts = NULL; 3042164839Sdavidxu else { 3043164839Sdavidxu error = copyin_timeout32(uap->uaddr2, &timeout); 3044164839Sdavidxu if (error != 0) 3045164839Sdavidxu return (error); 3046164839Sdavidxu if (timeout.tv_nsec >= 1000000000 || 3047164839Sdavidxu timeout.tv_nsec < 0) 3048164839Sdavidxu return (EINVAL); 3049164839Sdavidxu ts = &timeout; 3050164839Sdavidxu } 3051164876Sdavidxu return (do_cv_wait(td, uap->obj, uap->uaddr1, ts, uap->val)); 3052164839Sdavidxu} 3053164839Sdavidxu 3054177848Sdavidxustatic int 3055177848Sdavidxu__umtx_op_rw_rdlock_compat32(struct thread *td, struct _umtx_op_args *uap) 3056177848Sdavidxu{ 3057177848Sdavidxu struct timespec timeout; 3058177848Sdavidxu int error; 3059177848Sdavidxu 3060177848Sdavidxu /* Allow a null timespec (wait forever). */ 3061177848Sdavidxu if (uap->uaddr2 == NULL) { 3062177848Sdavidxu error = do_rw_rdlock(td, uap->obj, uap->val, 0); 3063177848Sdavidxu } else { 3064177848Sdavidxu error = copyin(uap->uaddr2, &timeout, 3065177848Sdavidxu sizeof(timeout)); 3066177848Sdavidxu if (error != 0) 3067177848Sdavidxu return (error); 3068177848Sdavidxu if (timeout.tv_nsec >= 1000000000 || 3069177848Sdavidxu timeout.tv_nsec < 0) { 3070177848Sdavidxu return (EINVAL); 3071177848Sdavidxu } 3072177848Sdavidxu error = do_rw_rdlock2(td, uap->obj, uap->val, &timeout); 3073177848Sdavidxu } 3074177848Sdavidxu return (error); 3075177848Sdavidxu} 3076177848Sdavidxu 3077177848Sdavidxustatic int 3078177848Sdavidxu__umtx_op_rw_wrlock_compat32(struct thread *td, struct _umtx_op_args *uap) 3079177848Sdavidxu{ 3080177848Sdavidxu struct timespec timeout; 3081177848Sdavidxu int error; 3082177848Sdavidxu 3083177848Sdavidxu /* Allow a null timespec (wait forever). */ 3084177848Sdavidxu if (uap->uaddr2 == NULL) { 3085177848Sdavidxu error = do_rwlock_wrlock(td, uap->obj, 0); 3086177848Sdavidxu } else { 3087177848Sdavidxu error = copyin_timeout32(uap->uaddr2, &timeout); 3088177848Sdavidxu if (error != 0) 3089177848Sdavidxu return (error); 3090177848Sdavidxu if (timeout.tv_nsec >= 1000000000 || 3091177848Sdavidxu timeout.tv_nsec < 0) { 3092177848Sdavidxu return (EINVAL); 3093177848Sdavidxu } 3094177848Sdavidxu 3095177848Sdavidxu error = do_rw_wrlock2(td, uap->obj, uap->val, &timeout); 3096177848Sdavidxu } 3097177848Sdavidxu return (error); 3098177848Sdavidxu} 3099177848Sdavidxu 3100162536Sdavidxustatic _umtx_op_func op_table_compat32[] = { 3101162536Sdavidxu __umtx_op_lock_umtx_compat32, /* UMTX_OP_LOCK */ 3102162536Sdavidxu __umtx_op_unlock_umtx_compat32, /* UMTX_OP_UNLOCK */ 3103162536Sdavidxu __umtx_op_wait_compat32, /* UMTX_OP_WAIT */ 3104162536Sdavidxu __umtx_op_wake, /* UMTX_OP_WAKE */ 3105162550Sdavidxu __umtx_op_trylock_umutex, /* UMTX_OP_MUTEX_LOCK */ 3106162536Sdavidxu __umtx_op_lock_umutex_compat32, /* UMTX_OP_MUTEX_TRYLOCK */ 3107162536Sdavidxu __umtx_op_unlock_umutex, /* UMTX_OP_MUTEX_UNLOCK */ 3108164839Sdavidxu __umtx_op_set_ceiling, /* UMTX_OP_SET_CEILING */ 3109164839Sdavidxu __umtx_op_cv_wait_compat32, /* UMTX_OP_CV_WAIT*/ 3110164839Sdavidxu __umtx_op_cv_signal, /* UMTX_OP_CV_SIGNAL */ 3111173800Sdavidxu __umtx_op_cv_broadcast, /* UMTX_OP_CV_BROADCAST */ 3112177848Sdavidxu __umtx_op_wait_compat32, /* UMTX_OP_WAIT_UINT */ 3113177848Sdavidxu __umtx_op_rw_rdlock_compat32, /* UMTX_OP_RW_RDLOCK */ 3114177848Sdavidxu __umtx_op_rw_wrlock_compat32, /* UMTX_OP_RW_WRLOCK */ 3115177848Sdavidxu __umtx_op_rw_unlock /* UMTX_OP_RW_UNLOCK */ 3116162536Sdavidxu}; 3117162536Sdavidxu 3118162536Sdavidxuint 3119162536Sdavidxufreebsd32_umtx_op(struct thread *td, struct freebsd32_umtx_op_args *uap) 3120162536Sdavidxu{ 3121163678Sdavidxu if ((unsigned)uap->op < UMTX_OP_MAX) 3122162536Sdavidxu return (*op_table_compat32[uap->op])(td, 3123162536Sdavidxu (struct _umtx_op_args *)uap); 3124162536Sdavidxu return (EINVAL); 3125162536Sdavidxu} 3126162536Sdavidxu#endif 3127162536Sdavidxu 3128161678Sdavidxuvoid 3129161678Sdavidxuumtx_thread_init(struct thread *td) 3130161678Sdavidxu{ 3131161678Sdavidxu td->td_umtxq = umtxq_alloc(); 3132161678Sdavidxu td->td_umtxq->uq_thread = td; 3133161678Sdavidxu} 3134161678Sdavidxu 3135161678Sdavidxuvoid 3136161678Sdavidxuumtx_thread_fini(struct thread *td) 3137161678Sdavidxu{ 3138161678Sdavidxu umtxq_free(td->td_umtxq); 3139161678Sdavidxu} 3140161678Sdavidxu 3141161678Sdavidxu/* 3142161678Sdavidxu * It will be called when new thread is created, e.g fork(). 3143161678Sdavidxu */ 3144161678Sdavidxuvoid 3145161678Sdavidxuumtx_thread_alloc(struct thread *td) 3146161678Sdavidxu{ 3147161678Sdavidxu struct umtx_q *uq; 3148161678Sdavidxu 3149161678Sdavidxu uq = td->td_umtxq; 3150161678Sdavidxu uq->uq_inherited_pri = PRI_MAX; 3151161678Sdavidxu 3152161678Sdavidxu KASSERT(uq->uq_flags == 0, ("uq_flags != 0")); 3153161678Sdavidxu KASSERT(uq->uq_thread == td, ("uq_thread != td")); 3154161678Sdavidxu KASSERT(uq->uq_pi_blocked == NULL, ("uq_pi_blocked != NULL")); 3155161678Sdavidxu KASSERT(TAILQ_EMPTY(&uq->uq_pi_contested), ("uq_pi_contested is not empty")); 3156161678Sdavidxu} 3157161678Sdavidxu 3158161678Sdavidxu/* 3159161678Sdavidxu * exec() hook. 3160161678Sdavidxu */ 3161161678Sdavidxustatic void 3162161678Sdavidxuumtx_exec_hook(void *arg __unused, struct proc *p __unused, 3163161678Sdavidxu struct image_params *imgp __unused) 3164161678Sdavidxu{ 3165161678Sdavidxu umtx_thread_cleanup(curthread); 3166161678Sdavidxu} 3167161678Sdavidxu 3168161678Sdavidxu/* 3169161678Sdavidxu * thread_exit() hook. 3170161678Sdavidxu */ 3171161678Sdavidxuvoid 3172161678Sdavidxuumtx_thread_exit(struct thread *td) 3173161678Sdavidxu{ 3174161678Sdavidxu umtx_thread_cleanup(td); 3175161678Sdavidxu} 3176161678Sdavidxu 3177161678Sdavidxu/* 3178161678Sdavidxu * clean up umtx data. 3179161678Sdavidxu */ 3180161678Sdavidxustatic void 3181161678Sdavidxuumtx_thread_cleanup(struct thread *td) 3182161678Sdavidxu{ 3183161678Sdavidxu struct umtx_q *uq; 3184161678Sdavidxu struct umtx_pi *pi; 3185161678Sdavidxu 3186161678Sdavidxu if ((uq = td->td_umtxq) == NULL) 3187161678Sdavidxu return; 3188161678Sdavidxu 3189170300Sjeff mtx_lock_spin(&umtx_lock); 3190161678Sdavidxu uq->uq_inherited_pri = PRI_MAX; 3191161678Sdavidxu while ((pi = TAILQ_FIRST(&uq->uq_pi_contested)) != NULL) { 3192161678Sdavidxu pi->pi_owner = NULL; 3193161678Sdavidxu TAILQ_REMOVE(&uq->uq_pi_contested, pi, pi_link); 3194161678Sdavidxu } 3195174701Sdavidxu thread_lock(td); 3196161678Sdavidxu td->td_flags &= ~TDF_UBORROWING; 3197174701Sdavidxu thread_unlock(td); 3198170300Sjeff mtx_unlock_spin(&umtx_lock); 3199161678Sdavidxu} 3200