sys/dev/acpica5/Osd/OsdSynch.c

   1 /*-
   2  * Copyright (c) 2000 Michael Smith
   3  * Copyright (c) 2000 BSDi
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/sys/dev/acpica/Osd/OsdSynch.c,v 1.21 2004/05/05 20:07:52 njl Exp $
  28  * $DragonFly: src/sys/dev/acpica5/Osd/OsdSynch.c,v 1.11 2007/01/25 15:12:06 y0netan1 Exp $
  29  */
  30
  31 /*
  32  * 6.1 : Mutual Exclusion and Synchronisation
  33  */
  34
  35 #include "acpi.h"
  36
  37 #include "opt_acpi.h"
  38 #include <sys/kernel.h>
  39 #include <sys/malloc.h>
  40 #include <sys/sysctl.h>
  41 #include <sys/lock.h>
  42 #include <sys/thread.h>
  43 #include <sys/thread2.h>
  44 #include <sys/spinlock2.h>
  45
  46 #define _COMPONENT      ACPI_OS_SERVICES
  47 ACPI_MODULE_NAME("SYNCH")
  48
  49 MALLOC_DEFINE(M_ACPISEM, "acpisem", "ACPI semaphore");
  50
  51 #define AS_LOCK(as)             spin_lock_wr(&(as)->as_mtx)
  52 #define AS_UNLOCK(as)           spin_unlock_wr(&(as)->as_mtx)
  53 #define AS_LOCK_DECL
  54
  55 /*
  56  * Simple counting semaphore implemented using a mutex.  (Subsequently used
  57  * in the OSI code to implement a mutex.  Go figure.)
  58  */
  59 struct acpi_semaphore {
  60     struct      spinlock as_mtx;
  61     UINT32      as_units;
  62     UINT32      as_maxunits;
  63     UINT32      as_pendings;
  64     UINT32      as_resetting;
  65     UINT32      as_timeouts;
  66 };
  67
  68 #ifndef ACPI_NO_SEMAPHORES
  69 #ifndef ACPI_SEMAPHORES_MAX_PENDING
  70 #define ACPI_SEMAPHORES_MAX_PENDING     4
  71 #endif
  72 static int      acpi_semaphore_debug = 0;
  73 TUNABLE_INT("debug.acpi_semaphore_debug", &acpi_semaphore_debug);
  74 SYSCTL_DECL(_debug_acpi);
  75 SYSCTL_INT(_debug_acpi, OID_AUTO, semaphore_debug, CTLFLAG_RW,
  76            &acpi_semaphore_debug, 0, "Enable ACPI semaphore debug messages");
  77 #endif /* !ACPI_NO_SEMAPHORES */
  78
  79 ACPI_STATUS
  80 AcpiOsCreateSemaphore(UINT32 MaxUnits, UINT32 InitialUnits,
  81     ACPI_HANDLE *OutHandle)
  82 {
  83 #ifndef ACPI_NO_SEMAPHORES
  84     struct acpi_semaphore       *as;
  85
  86     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  87
  88     if (OutHandle == NULL)
  89         return_ACPI_STATUS (AE_BAD_PARAMETER);
  90     if (InitialUnits > MaxUnits)
  91         return_ACPI_STATUS (AE_BAD_PARAMETER);
  92
  93     as = kmalloc(sizeof(*as), M_ACPISEM, M_INTWAIT | M_ZERO);
  94
  95     spin_init(&as->as_mtx);
  96     as->as_units = InitialUnits;
  97     as->as_maxunits = MaxUnits;
  98     as->as_pendings = as->as_resetting = as->as_timeouts = 0;
  99
 100     ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 101         "created semaphore %p max %d, initial %d\n",
 102         as, InitialUnits, MaxUnits));
 103
 104     *OutHandle = (ACPI_HANDLE)as;
 105 #else
 106     *OutHandle = (ACPI_HANDLE)OutHandle;
 107 #endif /* !ACPI_NO_SEMAPHORES */
 108
 109     return_ACPI_STATUS (AE_OK);
 110 }
 111
 112 ACPI_STATUS
 113 AcpiOsDeleteSemaphore(ACPI_HANDLE Handle)
 114 {
 115 #ifndef ACPI_NO_SEMAPHORES
 116     struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
 117
 118     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 119
 120     ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "destroyed semaphore %p\n", as));
 121     spin_uninit(&as->as_mtx);
 122     kfree(as, M_ACPISEM);
 123 #endif /* !ACPI_NO_SEMAPHORES */
 124
 125     return_ACPI_STATUS (AE_OK);
 126 }
 127
 128 ACPI_STATUS
 129 AcpiOsWaitSemaphore(ACPI_HANDLE Handle, UINT32 Units, UINT16 Timeout)
 130 {
 131 #ifndef ACPI_NO_SEMAPHORES
 132     ACPI_STATUS                 result;
 133     struct acpi_semaphore       *as = (struct acpi_semaphore *)Handle;
 134     int                         rv, tmo;
 135     struct timeval              timeouttv, currenttv, timelefttv;
 136     AS_LOCK_DECL;
 137
 138     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 139
 140     if (as == NULL)
 141         return_ACPI_STATUS (AE_BAD_PARAMETER);
 142
 143     if (cold)
 144         return_ACPI_STATUS (AE_OK);
 145
 146 #if 0
 147     if (as->as_units < Units && as->as_timeouts > 10) {
 148         kprintf("%s: semaphore %p too many timeouts, resetting\n", __func__, as);
 149         AS_LOCK(as);
 150         as->as_units = as->as_maxunits;
 151         if (as->as_pendings)
 152             as->as_resetting = 1;
 153         as->as_timeouts = 0;
 154         wakeup(as);
 155         AS_UNLOCK(as);
 156         return_ACPI_STATUS (AE_TIME);
 157     }
 158
 159     if (as->as_resetting)
 160         return_ACPI_STATUS (AE_TIME);
 161 #endif
 162
 163     /* a timeout of ACPI_WAIT_FOREVER means "forever" */
 164     if (Timeout == ACPI_WAIT_FOREVER) {
 165         tmo = 0;
 166         timeouttv.tv_sec = ((0xffff/1000) + 1); /* cf. ACPI spec */
 167         timeouttv.tv_usec = 0;
 168     } else {
 169         /* compute timeout using microseconds per tick */
 170         tmo = (Timeout * 1000) / (1000000 / hz);
 171         if (tmo <= 0)
 172             tmo = 1;
 173         timeouttv.tv_sec  = Timeout / 1000;
 174         timeouttv.tv_usec = (Timeout % 1000) * 1000;
 175     }
 176
 177     /* calculate timeout value in timeval */
 178     getmicrouptime(&currenttv);
 179     timevaladd(&timeouttv, &currenttv);
 180
 181     AS_LOCK(as);
 182     ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 183         "get %d units from semaphore %p (has %d), timeout %d\n",
 184         Units, as, as->as_units, Timeout));
 185     for (;;) {
 186         if (as->as_maxunits == ACPI_NO_UNIT_LIMIT) {
 187             result = AE_OK;
 188             break;
 189         }
 190         if (as->as_units >= Units) {
 191             as->as_units -= Units;
 192             result = AE_OK;
 193             break;
 194         }
 195
 196         /* limit number of pending treads */
 197         if (as->as_pendings >= ACPI_SEMAPHORES_MAX_PENDING) {
 198             result = AE_TIME;
 199             break;
 200         }
 201
 202         /* if timeout values of zero is specified, return immediately */
 203         if (Timeout == 0) {
 204             result = AE_TIME;
 205             break;
 206         }
 207
 208         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 209             "semaphore blocked, calling msleep(%p, %p, %d, \"acsem\", %d)\n",
 210             as, &as->as_mtx, PCATCH, tmo));
 211
 212         as->as_pendings++;
 213
 214         if (acpi_semaphore_debug) {
 215             kprintf("%s: Sleep %d, pending %d, semaphore %p, thread %d\n",
 216                 __func__, Timeout, as->as_pendings, as, AcpiOsGetThreadId());
 217         }
 218
 219         rv = msleep(as, &as->as_mtx, PCATCH, "acsem", tmo);
 220
 221         as->as_pendings--;
 222
 223 #if 0
 224         if (as->as_resetting) {
 225             /* semaphore reset, return immediately */
 226             if (as->as_pendings == 0) {
 227                 as->as_resetting = 0;
 228             }
 229             result = AE_TIME;
 230             break;
 231         }
 232 #endif
 233
 234         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "msleep(%d) returned %d\n", tmo, rv));
 235         if (rv == EWOULDBLOCK) {
 236             result = AE_TIME;
 237             break;
 238         }
 239
 240         /* check if we already awaited enough */
 241         timelefttv = timeouttv;
 242         getmicrouptime(&currenttv);
 243         timevalsub(&timelefttv, &currenttv);
 244         if (timelefttv.tv_sec < 0) {
 245             ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "await semaphore %p timeout\n",
 246                 as));
 247             result = AE_TIME;
 248             break;
 249         }
 250
 251         /* adjust timeout for the next sleep */
 252         tmo = (timelefttv.tv_sec * 1000000 + timelefttv.tv_usec) /
 253             (1000000 / hz);
 254         if (tmo <= 0)
 255             tmo = 1;
 256
 257         if (acpi_semaphore_debug) {
 258             kprintf("%s: Wakeup timeleft(%lu, %lu), tmo %u, sem %p, thread %d\n",
 259                 __func__, timelefttv.tv_sec, timelefttv.tv_usec, tmo, as,
 260                 AcpiOsGetThreadId());
 261         }
 262     }
 263
 264     if (acpi_semaphore_debug) {
 265         if (result == AE_TIME && Timeout > 0) {
 266             kprintf("%s: Timeout %d, pending %d, semaphore %p\n",
 267                 __func__, Timeout, as->as_pendings, as);
 268         }
 269         if (result == AE_OK && (as->as_timeouts > 0 || as->as_pendings > 0)) {
 270             kprintf("%s: Acquire %d, units %d, pending %d, sem %p, thread %d\n",
 271                 __func__, Units, as->as_units, as->as_pendings, as,
 272                 AcpiOsGetThreadId());
 273         }
 274     }
 275
 276     if (result == AE_TIME)
 277         as->as_timeouts++;
 278     else
 279         as->as_timeouts = 0;
 280
 281     AS_UNLOCK(as);
 282     return_ACPI_STATUS (result);
 283 #else
 284     return_ACPI_STATUS (AE_OK);
 285 #endif /* !ACPI_NO_SEMAPHORES */
 286 }
 287
 288 ACPI_STATUS
 289 AcpiOsSignalSemaphore(ACPI_HANDLE Handle, UINT32 Units)
 290 {
 291 #ifndef ACPI_NO_SEMAPHORES
 292     struct acpi_semaphore       *as = (struct acpi_semaphore *)Handle;
 293     AS_LOCK_DECL;
 294
 295     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 296
 297     if (as == NULL)
 298         return_ACPI_STATUS(AE_BAD_PARAMETER);
 299
 300     AS_LOCK(as);
 301     ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 302         "return %d units to semaphore %p (has %d)\n",
 303         Units, as, as->as_units));
 304     if (as->as_maxunits != ACPI_NO_UNIT_LIMIT) {
 305         as->as_units += Units;
 306         if (as->as_units > as->as_maxunits)
 307             as->as_units = as->as_maxunits;
 308     }
 309
 310     if (acpi_semaphore_debug && (as->as_timeouts > 0 || as->as_pendings > 0)) {
 311         kprintf("%s: Release %d, units %d, pending %d, semaphore %p, thread %d\n",
 312             __func__, Units, as->as_units, as->as_pendings, as, AcpiOsGetThreadId());
 313     }
 314
 315     wakeup(as);
 316     AS_UNLOCK(as);
 317 #endif /* !ACPI_NO_SEMAPHORES */
 318
 319     return_ACPI_STATUS (AE_OK);
 320 }
 321
 322 struct acpi_spinlock {
 323     struct spinlock lock;
 324 #ifdef ACPI_DEBUG_LOCKS
 325     thread_t    owner;
 326     const char *func;
 327     int line;
 328 #endif
 329 };
 330
 331 ACPI_STATUS
 332 AcpiOsCreateLock(ACPI_SPINLOCK *OutHandle)
 333 {
 334     ACPI_SPINLOCK spin;
 335
 336     if (OutHandle == NULL)
 337         return (AE_BAD_PARAMETER);
 338     spin = kmalloc(sizeof(*spin), M_ACPISEM, M_INTWAIT|M_ZERO);
 339     spin_init(&spin->lock);
 340 #ifdef ACPI_DEBUG_LOCKS
 341     spin->owner = NULL;
 342     spin->func = "";
 343     spin->line = 0;
 344 #endif
 345     *OutHandle = spin;
 346     return (AE_OK);
 347 }
 348
 349 void
 350 AcpiOsDeleteLock (ACPI_SPINLOCK Spin)
 351 {
 352     if (Spin == NULL)
 353         return;
 354     spin_uninit(&Spin->lock);
 355     kfree(Spin, M_ACPISEM);
 356 }
 357
 358 /*
 359  * OS-dependent locking primitives.  These routines should be able to be
 360  * called from an interrupt-handler or cpu_idle thread.
 361  *
 362  * NB: some of ACPI-CA functions with locking flags, say AcpiSetRegister(),
 363  * are changed to unconditionally call AcpiOsAcquireLock/AcpiOsReleaseLock.
 364  */
 365 ACPI_CPU_FLAGS
 366 #ifdef ACPI_DEBUG_LOCKS
 367 _AcpiOsAcquireLock (ACPI_SPINLOCK Spin, const char *func, int line)
 368 #else
 369 AcpiOsAcquireLock (ACPI_SPINLOCK Spin)
 370 #endif
 371 {
 372     spin_lock_wr(&Spin->lock);
 373
 374 #ifdef ACPI_DEBUG_LOCKS
 375     if (Spin->owner) {
 376         kprintf("%p(%s:%d): acpi_spinlock %p already held by %p(%s:%d)\n",
 377                 curthread, func, line, Spin, Spin->owner, Spin->func,
 378                 Spin->line);
 379         print_backtrace();
 380     } else {
 381         Spin->owner = curthread;
 382         Spin->func = func;
 383         Spin->line = line;
 384     }
 385 #endif
 386     return(0);
 387 }
 388
 389 void
 390 AcpiOsReleaseLock (ACPI_SPINLOCK Spin, UINT32 Flags)
 391 {
 392 #ifdef ACPI_DEBUG_LOCKS
 393     if (Flags) {
 394         if (Spin->owner != NULL) {
 395             kprintf("%p: acpi_spinlock %p is unexectedly held by %p(%s:%d)\n",
 396                     curthread, Spin, Spin->owner, Spin->func, Spin->line);
 397             print_backtrace();
 398         } else
 399             return;
 400     }
 401     Spin->owner = NULL;
 402     Spin->func = "";
 403     Spin->line = 0;
 404 #endif
 405     spin_unlock_wr(&Spin->lock);
 406 }
 407
 408 /* Section 5.2.9.1:  global lock acquire/release functions */
 409 #define GL_ACQUIRED     (-1)
 410 #define GL_BUSY         0
 411 #define GL_BIT_PENDING  0x1
 412 #define GL_BIT_OWNED    0x2
 413 #define GL_BIT_MASK     (GL_BIT_PENDING | GL_BIT_OWNED)
 414
 415 /*
 416  * Acquire the global lock.  If busy, set the pending bit.  The caller
 417  * will wait for notification from the BIOS that the lock is available
 418  * and then attempt to acquire it again.
 419  */
 420 int
 421 acpi_acquire_global_lock(uint32_t *lock)
 422 {
 423         uint32_t new, old;
 424
 425         do {
 426                 old = *lock;
 427                 new = ((old & ~GL_BIT_MASK) | GL_BIT_OWNED) |
 428                         ((old >> 1) & GL_BIT_PENDING);
 429         } while (atomic_cmpset_int(lock, old, new) == 0);
 430
 431         return ((new < GL_BIT_MASK) ? GL_ACQUIRED : GL_BUSY);
 432 }
 433
 434 /*
 435  * Release the global lock, returning whether there is a waiter pending.
 436  * If the BIOS set the pending bit, OSPM must notify the BIOS when it
 437  * releases the lock.
 438  */
 439 int
 440 acpi_release_global_lock(uint32_t *lock)
 441 {
 442         uint32_t new, old;
 443
 444         do {
 445                 old = *lock;
 446                 new = old & ~GL_BIT_MASK;
 447         } while (atomic_cmpset_int(lock, old, new) == 0);
 448
 449         return (old & GL_BIT_PENDING);
 450 }