1 /*- 2 * Copyright (c) 2000, 2001 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 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include "opt_acpi.h" 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/bus.h> 35 #include <sys/cpu.h> 36 #include <sys/kthread.h> 37 #include <sys/malloc.h> 38 #include <sys/module.h> 39 #include <sys/bus.h> 40 #include <sys/proc.h> 41 #include <sys/reboot.h> 42 #include <sys/sysctl.h> 43 #include <sys/unistd.h> 44 #include <sys/power.h> 45 46 #include "cpufreq_if.h" 47 48 #include <contrib/dev/acpica/acpi.h> 49 #include <dev/acpica/acpivar.h> 50 51 /* Hooks for the ACPI CA debugging infrastructure */ 52 #define _COMPONENT ACPI_THERMAL 53 ACPI_MODULE_NAME("THERMAL") 54 55 #define TZ_ZEROC 2732 56 #define TZ_KELVTOC(x) (((x) - TZ_ZEROC) / 10), abs(((x) - TZ_ZEROC) % 10) 57 58 #define TZ_NOTIFY_TEMPERATURE 0x80 /* Temperature changed. */ 59 #define TZ_NOTIFY_LEVELS 0x81 /* Cooling levels changed. */ 60 #define TZ_NOTIFY_DEVICES 0x82 /* Device lists changed. */ 61 #define TZ_NOTIFY_CRITICAL 0xcc /* Fake notify that _CRT/_HOT reached. */ 62 63 /* Check for temperature changes every 10 seconds by default */ 64 #define TZ_POLLRATE 10 65 66 /* Make sure the reported temperature is valid for this number of polls. */ 67 #define TZ_VALIDCHECKS 3 68 69 /* Notify the user we will be shutting down in one more poll cycle. */ 70 #define TZ_NOTIFYCOUNT (TZ_VALIDCHECKS - 1) 71 72 /* ACPI spec defines this */ 73 #define TZ_NUMLEVELS 10 74 struct acpi_tz_zone { 75 int ac[TZ_NUMLEVELS]; 76 ACPI_BUFFER al[TZ_NUMLEVELS]; 77 int crt; 78 int hot; 79 ACPI_BUFFER psl; 80 int psv; 81 int tc1; 82 int tc2; 83 int tsp; 84 int tzp; 85 }; 86 87 struct acpi_tz_softc { 88 device_t tz_dev; 89 ACPI_HANDLE tz_handle; /*Thermal zone handle*/ 90 int tz_temperature; /*Current temperature*/ 91 int tz_active; /*Current active cooling*/ 92 #define TZ_ACTIVE_NONE -1 93 int tz_requested; /*Minimum active cooling*/ 94 int tz_thflags; /*Current temp-related flags*/ 95 #define TZ_THFLAG_NONE 0 96 #define TZ_THFLAG_PSV (1<<0) 97 #define TZ_THFLAG_HOT (1<<2) 98 #define TZ_THFLAG_CRT (1<<3) 99 int tz_flags; 100 #define TZ_FLAG_NO_SCP (1<<0) /*No _SCP method*/ 101 #define TZ_FLAG_GETPROFILE (1<<1) /*Get power_profile in timeout*/ 102 #define TZ_FLAG_GETSETTINGS (1<<2) /*Get devs/setpoints*/ 103 struct timespec tz_cooling_started; 104 /*Current cooling starting time*/ 105 106 struct sysctl_ctx_list tz_sysctl_ctx; 107 struct sysctl_oid *tz_sysctl_tree; 108 eventhandler_tag tz_event; 109 110 struct acpi_tz_zone tz_zone; /*Thermal zone parameters*/ 111 int tz_validchecks; 112 113 /* passive cooling */ 114 struct proc *tz_cooling_proc; 115 int tz_cooling_proc_running; 116 int tz_cooling_enabled; 117 int tz_cooling_active; 118 int tz_cooling_updated; 119 int tz_cooling_saved_freq; 120 }; 121 122 #define CPUFREQ_MAX_LEVELS 64 /* XXX cpufreq should export this */ 123 124 static int acpi_tz_probe(device_t dev); 125 static int acpi_tz_attach(device_t dev); 126 static int acpi_tz_establish(struct acpi_tz_softc *sc); 127 static void acpi_tz_monitor(void *Context); 128 static void acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg); 129 static void acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg); 130 static void acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, 131 int *data); 132 static void acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what); 133 static int acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS); 134 static int acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS); 135 static int acpi_tz_temp_sysctl(SYSCTL_HANDLER_ARGS); 136 static int acpi_tz_passive_sysctl(SYSCTL_HANDLER_ARGS); 137 static void acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, 138 void *context); 139 static void acpi_tz_signal(struct acpi_tz_softc *sc, int flags); 140 static void acpi_tz_timeout(struct acpi_tz_softc *sc, int flags); 141 static void acpi_tz_power_profile(void *arg); 142 static void acpi_tz_thread(void *arg); 143 static int acpi_tz_cooling_is_available(struct acpi_tz_softc *sc); 144 static int acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc); 145 146 static device_method_t acpi_tz_methods[] = { 147 /* Device interface */ 148 DEVMETHOD(device_probe, acpi_tz_probe), 149 DEVMETHOD(device_attach, acpi_tz_attach), 150 151 {0, 0} 152 }; 153 154 static driver_t acpi_tz_driver = { 155 "acpi_tz", 156 acpi_tz_methods, 157 sizeof(struct acpi_tz_softc), 158 }; 159 160 static devclass_t acpi_tz_devclass; 161 DRIVER_MODULE(acpi_tz, acpi, acpi_tz_driver, acpi_tz_devclass, 0, 0); 162 MODULE_DEPEND(acpi_tz, acpi, 1, 1, 1); 163 164 static struct sysctl_ctx_list acpi_tz_sysctl_ctx; 165 static struct sysctl_oid *acpi_tz_sysctl_tree; 166 167 /* Minimum cooling run time */ 168 static int acpi_tz_min_runtime; 169 static int acpi_tz_polling_rate = TZ_POLLRATE; 170 static int acpi_tz_override; 171 172 /* Timezone polling thread */ 173 static struct proc *acpi_tz_proc; 174 ACPI_LOCK_DECL(thermal, "ACPI thermal zone"); 175 176 static int 177 acpi_tz_probe(device_t dev) 178 { 179 int result; 180 181 if (acpi_get_type(dev) == ACPI_TYPE_THERMAL && !acpi_disabled("thermal")) { 182 device_set_desc(dev, "Thermal Zone"); 183 result = -10; 184 } else 185 result = ENXIO; 186 return (result); 187 } 188 189 static int 190 acpi_tz_attach(device_t dev) 191 { 192 struct acpi_tz_softc *sc; 193 struct acpi_softc *acpi_sc; 194 int error; 195 char oidname[8]; 196 197 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 198 199 sc = device_get_softc(dev); 200 sc->tz_dev = dev; 201 sc->tz_handle = acpi_get_handle(dev); 202 sc->tz_requested = TZ_ACTIVE_NONE; 203 sc->tz_active = TZ_ACTIVE_NONE; 204 sc->tz_thflags = TZ_THFLAG_NONE; 205 sc->tz_cooling_proc = NULL; 206 sc->tz_cooling_proc_running = FALSE; 207 sc->tz_cooling_active = FALSE; 208 sc->tz_cooling_updated = FALSE; 209 210 /* 211 * Always attempt to enable passive cooling for tz0. Users can enable 212 * it for other zones manually for now. 213 * 214 * XXX We need to test if multiple zones conflict with each other 215 * since cpufreq currently sets all CPUs to the given frequency whereas 216 * it's possible for different thermal zones to specify independent 217 * settings for multiple CPUs. 218 */ 219 sc->tz_cooling_enabled = (device_get_unit(dev) == 0); 220 221 /* 222 * Parse the current state of the thermal zone and build control 223 * structures. We don't need to worry about interference with the 224 * control thread since we haven't fully attached this device yet. 225 */ 226 if ((error = acpi_tz_establish(sc)) != 0) 227 return (error); 228 229 /* 230 * Register for any Notify events sent to this zone. 231 */ 232 AcpiInstallNotifyHandler(sc->tz_handle, ACPI_DEVICE_NOTIFY, 233 acpi_tz_notify_handler, sc); 234 235 /* 236 * Create our sysctl nodes. 237 * 238 * XXX we need a mechanism for adding nodes under ACPI. 239 */ 240 if (device_get_unit(dev) == 0) { 241 acpi_sc = acpi_device_get_parent_softc(dev); 242 sysctl_ctx_init(&acpi_tz_sysctl_ctx); 243 acpi_tz_sysctl_tree = SYSCTL_ADD_NODE(&acpi_tz_sysctl_ctx, 244 SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), 245 OID_AUTO, "thermal", CTLFLAG_RD, 0, ""); 246 SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx, 247 SYSCTL_CHILDREN(acpi_tz_sysctl_tree), 248 OID_AUTO, "min_runtime", CTLFLAG_RW, 249 &acpi_tz_min_runtime, 0, 250 "minimum cooling run time in sec"); 251 SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx, 252 SYSCTL_CHILDREN(acpi_tz_sysctl_tree), 253 OID_AUTO, "polling_rate", CTLFLAG_RW, 254 &acpi_tz_polling_rate, 0, "monitor polling rate"); 255 SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx, 256 SYSCTL_CHILDREN(acpi_tz_sysctl_tree), OID_AUTO, 257 "user_override", CTLFLAG_RW, &acpi_tz_override, 0, 258 "allow override of thermal settings"); 259 } 260 sysctl_ctx_init(&sc->tz_sysctl_ctx); 261 sprintf(oidname, "tz%d", device_get_unit(dev)); 262 sc->tz_sysctl_tree = SYSCTL_ADD_NODE(&sc->tz_sysctl_ctx, 263 SYSCTL_CHILDREN(acpi_tz_sysctl_tree), 264 OID_AUTO, oidname, CTLFLAG_RD, 0, ""); 265 SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 266 OID_AUTO, "temperature", CTLFLAG_RD, &sc->tz_temperature, 267 sizeof(sc->tz_temperature), "IK", 268 "current thermal zone temperature"); 269 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 270 OID_AUTO, "active", CTLTYPE_INT | CTLFLAG_RW, 271 sc, 0, acpi_tz_active_sysctl, "I", "cooling is active"); 272 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 273 OID_AUTO, "passive_cooling", CTLTYPE_INT | CTLFLAG_RW, 274 sc, 0, acpi_tz_cooling_sysctl, "I", 275 "enable passive (speed reduction) cooling"); 276 277 SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 278 OID_AUTO, "thermal_flags", CTLFLAG_RD, 279 &sc->tz_thflags, 0, "thermal zone flags"); 280 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 281 OID_AUTO, "_PSV", CTLTYPE_INT | CTLFLAG_RW, 282 sc, offsetof(struct acpi_tz_softc, tz_zone.psv), 283 acpi_tz_temp_sysctl, "IK", "passive cooling temp setpoint"); 284 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 285 OID_AUTO, "_HOT", CTLTYPE_INT | CTLFLAG_RW, 286 sc, offsetof(struct acpi_tz_softc, tz_zone.hot), 287 acpi_tz_temp_sysctl, "IK", 288 "too hot temp setpoint (suspend now)"); 289 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 290 OID_AUTO, "_CRT", CTLTYPE_INT | CTLFLAG_RW, 291 sc, offsetof(struct acpi_tz_softc, tz_zone.crt), 292 acpi_tz_temp_sysctl, "IK", 293 "critical temp setpoint (shutdown now)"); 294 SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 295 OID_AUTO, "_ACx", CTLFLAG_RD, &sc->tz_zone.ac, 296 sizeof(sc->tz_zone.ac), "IK", ""); 297 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 298 OID_AUTO, "_TC1", CTLTYPE_INT | CTLFLAG_RW, 299 sc, offsetof(struct acpi_tz_softc, tz_zone.tc1), 300 acpi_tz_passive_sysctl, "I", 301 "thermal constant 1 for passive cooling"); 302 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 303 OID_AUTO, "_TC2", CTLTYPE_INT | CTLFLAG_RW, 304 sc, offsetof(struct acpi_tz_softc, tz_zone.tc2), 305 acpi_tz_passive_sysctl, "I", 306 "thermal constant 2 for passive cooling"); 307 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 308 OID_AUTO, "_TSP", CTLTYPE_INT | CTLFLAG_RW, 309 sc, offsetof(struct acpi_tz_softc, tz_zone.tsp), 310 acpi_tz_passive_sysctl, "I", 311 "thermal sampling period for passive cooling"); 312 313 /* 314 * Create thread to service all of the thermal zones. Register 315 * our power profile event handler. 316 */ 317 sc->tz_event = EVENTHANDLER_REGISTER(power_profile_change, 318 acpi_tz_power_profile, sc, 0); 319 if (acpi_tz_proc == NULL) { 320 error = kproc_create(acpi_tz_thread, NULL, &acpi_tz_proc, 321 RFHIGHPID, 0, "acpi_thermal"); 322 if (error != 0) { 323 device_printf(sc->tz_dev, "could not create thread - %d", error); 324 goto out; 325 } 326 } 327 328 /* Create a thread to handle passive cooling for each zone if enabled. */ 329 if (sc->tz_cooling_enabled) { 330 if (acpi_tz_cooling_is_available(sc)) { 331 error = acpi_tz_cooling_thread_start(sc); 332 if (error != 0) { 333 sc->tz_cooling_enabled = FALSE; 334 goto out; 335 } 336 } else 337 sc->tz_cooling_enabled = FALSE; 338 } 339 340 /* 341 * Flag the event handler for a manual invocation by our timeout. 342 * We defer it like this so that the rest of the subsystem has time 343 * to come up. Don't bother evaluating/printing the temperature at 344 * this point; on many systems it'll be bogus until the EC is running. 345 */ 346 sc->tz_flags |= TZ_FLAG_GETPROFILE; 347 348 out: 349 if (error != 0) { 350 EVENTHANDLER_DEREGISTER(power_profile_change, sc->tz_event); 351 AcpiRemoveNotifyHandler(sc->tz_handle, ACPI_DEVICE_NOTIFY, 352 acpi_tz_notify_handler); 353 sysctl_ctx_free(&sc->tz_sysctl_ctx); 354 } 355 return_VALUE (error); 356 } 357 358 /* 359 * Parse the current state of this thermal zone and set up to use it. 360 * 361 * Note that we may have previous state, which will have to be discarded. 362 */ 363 static int 364 acpi_tz_establish(struct acpi_tz_softc *sc) 365 { 366 ACPI_OBJECT *obj; 367 int i; 368 char nbuf[8]; 369 370 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 371 372 /* Erase any existing state. */ 373 for (i = 0; i < TZ_NUMLEVELS; i++) 374 if (sc->tz_zone.al[i].Pointer != NULL) 375 AcpiOsFree(sc->tz_zone.al[i].Pointer); 376 if (sc->tz_zone.psl.Pointer != NULL) 377 AcpiOsFree(sc->tz_zone.psl.Pointer); 378 379 /* 380 * XXX: We initialize only ACPI_BUFFER to avoid race condition 381 * with passive cooling thread which refers psv, tc1, tc2 and tsp. 382 */ 383 bzero(sc->tz_zone.ac, sizeof(sc->tz_zone.ac)); 384 bzero(sc->tz_zone.al, sizeof(sc->tz_zone.al)); 385 bzero(&sc->tz_zone.psl, sizeof(sc->tz_zone.psl)); 386 387 /* Evaluate thermal zone parameters. */ 388 for (i = 0; i < TZ_NUMLEVELS; i++) { 389 sprintf(nbuf, "_AC%d", i); 390 acpi_tz_getparam(sc, nbuf, &sc->tz_zone.ac[i]); 391 sprintf(nbuf, "_AL%d", i); 392 sc->tz_zone.al[i].Length = ACPI_ALLOCATE_BUFFER; 393 sc->tz_zone.al[i].Pointer = NULL; 394 AcpiEvaluateObject(sc->tz_handle, nbuf, NULL, &sc->tz_zone.al[i]); 395 obj = (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer; 396 if (obj != NULL) { 397 /* Should be a package containing a list of power objects */ 398 if (obj->Type != ACPI_TYPE_PACKAGE) { 399 device_printf(sc->tz_dev, "%s has unknown type %d, rejecting\n", 400 nbuf, obj->Type); 401 return_VALUE (ENXIO); 402 } 403 } 404 } 405 acpi_tz_getparam(sc, "_CRT", &sc->tz_zone.crt); 406 acpi_tz_getparam(sc, "_HOT", &sc->tz_zone.hot); 407 sc->tz_zone.psl.Length = ACPI_ALLOCATE_BUFFER; 408 sc->tz_zone.psl.Pointer = NULL; 409 AcpiEvaluateObject(sc->tz_handle, "_PSL", NULL, &sc->tz_zone.psl); 410 acpi_tz_getparam(sc, "_PSV", &sc->tz_zone.psv); 411 acpi_tz_getparam(sc, "_TC1", &sc->tz_zone.tc1); 412 acpi_tz_getparam(sc, "_TC2", &sc->tz_zone.tc2); 413 acpi_tz_getparam(sc, "_TSP", &sc->tz_zone.tsp); 414 acpi_tz_getparam(sc, "_TZP", &sc->tz_zone.tzp); 415 416 /* 417 * Sanity-check the values we've been given. 418 * 419 * XXX what do we do about systems that give us the same value for 420 * more than one of these setpoints? 421 */ 422 acpi_tz_sanity(sc, &sc->tz_zone.crt, "_CRT"); 423 acpi_tz_sanity(sc, &sc->tz_zone.hot, "_HOT"); 424 acpi_tz_sanity(sc, &sc->tz_zone.psv, "_PSV"); 425 for (i = 0; i < TZ_NUMLEVELS; i++) 426 acpi_tz_sanity(sc, &sc->tz_zone.ac[i], "_ACx"); 427 428 return_VALUE (0); 429 } 430 431 static char *aclevel_string[] = { 432 "NONE", "_AC0", "_AC1", "_AC2", "_AC3", "_AC4", 433 "_AC5", "_AC6", "_AC7", "_AC8", "_AC9" 434 }; 435 436 static __inline const char * 437 acpi_tz_aclevel_string(int active) 438 { 439 if (active < -1 || active >= TZ_NUMLEVELS) 440 return (aclevel_string[0]); 441 442 return (aclevel_string[active + 1]); 443 } 444 445 /* 446 * Get the current temperature. 447 */ 448 static int 449 acpi_tz_get_temperature(struct acpi_tz_softc *sc) 450 { 451 int temp; 452 ACPI_STATUS status; 453 static char *tmp_name = "_TMP"; 454 455 ACPI_FUNCTION_NAME ("acpi_tz_get_temperature"); 456 457 /* Evaluate the thermal zone's _TMP method. */ 458 status = acpi_GetInteger(sc->tz_handle, tmp_name, &temp); 459 if (ACPI_FAILURE(status)) { 460 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 461 "error fetching current temperature -- %s\n", 462 AcpiFormatException(status)); 463 return (FALSE); 464 } 465 466 /* Check it for validity. */ 467 acpi_tz_sanity(sc, &temp, tmp_name); 468 if (temp == -1) 469 return (FALSE); 470 471 ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "got %d.%dC\n", TZ_KELVTOC(temp))); 472 sc->tz_temperature = temp; 473 return (TRUE); 474 } 475 476 /* 477 * Evaluate the condition of a thermal zone, take appropriate actions. 478 */ 479 static void 480 acpi_tz_monitor(void *Context) 481 { 482 struct acpi_tz_softc *sc; 483 struct timespec curtime; 484 int temp; 485 int i; 486 int newactive, newflags; 487 488 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 489 490 sc = (struct acpi_tz_softc *)Context; 491 492 /* Get the current temperature. */ 493 if (!acpi_tz_get_temperature(sc)) { 494 /* XXX disable zone? go to max cooling? */ 495 return_VOID; 496 } 497 temp = sc->tz_temperature; 498 499 /* 500 * Work out what we ought to be doing right now. 501 * 502 * Note that the _ACx levels sort from hot to cold. 503 */ 504 newactive = TZ_ACTIVE_NONE; 505 for (i = TZ_NUMLEVELS - 1; i >= 0; i--) { 506 if (sc->tz_zone.ac[i] != -1 && temp >= sc->tz_zone.ac[i]) { 507 newactive = i; 508 if (sc->tz_active != newactive) { 509 ACPI_VPRINT(sc->tz_dev, 510 acpi_device_get_parent_softc(sc->tz_dev), 511 "_AC%d: temperature %d.%d >= setpoint %d.%d\n", i, 512 TZ_KELVTOC(temp), TZ_KELVTOC(sc->tz_zone.ac[i])); 513 } 514 } 515 } 516 517 /* 518 * We are going to get _ACx level down (colder side), but give a guaranteed 519 * minimum cooling run time if requested. 520 */ 521 if (acpi_tz_min_runtime > 0 && sc->tz_active != TZ_ACTIVE_NONE && 522 (newactive == TZ_ACTIVE_NONE || newactive > sc->tz_active)) { 523 524 getnanotime(&curtime); 525 timespecsub(&curtime, &sc->tz_cooling_started); 526 if (curtime.tv_sec < acpi_tz_min_runtime) 527 newactive = sc->tz_active; 528 } 529 530 /* Handle user override of active mode */ 531 if (sc->tz_requested != TZ_ACTIVE_NONE && sc->tz_requested < newactive) 532 newactive = sc->tz_requested; 533 534 /* update temperature-related flags */ 535 newflags = TZ_THFLAG_NONE; 536 if (sc->tz_zone.psv != -1 && temp >= sc->tz_zone.psv) 537 newflags |= TZ_THFLAG_PSV; 538 if (sc->tz_zone.hot != -1 && temp >= sc->tz_zone.hot) 539 newflags |= TZ_THFLAG_HOT; 540 if (sc->tz_zone.crt != -1 && temp >= sc->tz_zone.crt) 541 newflags |= TZ_THFLAG_CRT; 542 543 /* If the active cooling state has changed, we have to switch things. */ 544 if (newactive != sc->tz_active) { 545 /* Turn off the cooling devices that are on, if any are */ 546 if (sc->tz_active != TZ_ACTIVE_NONE) 547 acpi_ForeachPackageObject( 548 (ACPI_OBJECT *)sc->tz_zone.al[sc->tz_active].Pointer, 549 acpi_tz_switch_cooler_off, sc); 550 551 /* Turn on cooling devices that are required, if any are */ 552 if (newactive != TZ_ACTIVE_NONE) { 553 acpi_ForeachPackageObject( 554 (ACPI_OBJECT *)sc->tz_zone.al[newactive].Pointer, 555 acpi_tz_switch_cooler_on, sc); 556 } 557 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 558 "switched from %s to %s: %d.%dC\n", 559 acpi_tz_aclevel_string(sc->tz_active), 560 acpi_tz_aclevel_string(newactive), TZ_KELVTOC(temp)); 561 sc->tz_active = newactive; 562 getnanotime(&sc->tz_cooling_started); 563 } 564 565 /* XXX (de)activate any passive cooling that may be required. */ 566 567 /* 568 * If the temperature is at _HOT or _CRT, increment our event count. 569 * If it has occurred enough times, shutdown the system. This is 570 * needed because some systems will report an invalid high temperature 571 * for one poll cycle. It is suspected this is due to the embedded 572 * controller timing out. A typical value is 138C for one cycle on 573 * a system that is otherwise 65C. 574 * 575 * If we're almost at that threshold, notify the user through devd(8). 576 */ 577 if ((newflags & (TZ_THFLAG_HOT | TZ_THFLAG_CRT)) != 0) { 578 sc->tz_validchecks++; 579 if (sc->tz_validchecks == TZ_VALIDCHECKS) { 580 device_printf(sc->tz_dev, 581 "WARNING - current temperature (%d.%dC) exceeds safe limits\n", 582 TZ_KELVTOC(sc->tz_temperature)); 583 shutdown_nice(RB_POWEROFF); 584 } else if (sc->tz_validchecks == TZ_NOTIFYCOUNT) 585 acpi_UserNotify("Thermal", sc->tz_handle, TZ_NOTIFY_CRITICAL); 586 } else { 587 sc->tz_validchecks = 0; 588 } 589 sc->tz_thflags = newflags; 590 591 return_VOID; 592 } 593 594 /* 595 * Given an object, verify that it's a reference to a device of some sort, 596 * and try to switch it off. 597 */ 598 static void 599 acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg) 600 { 601 ACPI_HANDLE cooler; 602 603 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 604 605 cooler = acpi_GetReference(NULL, obj); 606 if (cooler == NULL) { 607 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n")); 608 return_VOID; 609 } 610 611 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s off\n", 612 acpi_name(cooler))); 613 acpi_pwr_switch_consumer(cooler, ACPI_STATE_D3); 614 615 return_VOID; 616 } 617 618 /* 619 * Given an object, verify that it's a reference to a device of some sort, 620 * and try to switch it on. 621 * 622 * XXX replication of off/on function code is bad. 623 */ 624 static void 625 acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg) 626 { 627 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg; 628 ACPI_HANDLE cooler; 629 ACPI_STATUS status; 630 631 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 632 633 cooler = acpi_GetReference(NULL, obj); 634 if (cooler == NULL) { 635 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n")); 636 return_VOID; 637 } 638 639 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s on\n", 640 acpi_name(cooler))); 641 status = acpi_pwr_switch_consumer(cooler, ACPI_STATE_D0); 642 if (ACPI_FAILURE(status)) { 643 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 644 "failed to activate %s - %s\n", acpi_name(cooler), 645 AcpiFormatException(status)); 646 } 647 648 return_VOID; 649 } 650 651 /* 652 * Read/debug-print a parameter, default it to -1. 653 */ 654 static void 655 acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data) 656 { 657 658 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 659 660 if (ACPI_FAILURE(acpi_GetInteger(sc->tz_handle, node, data))) { 661 *data = -1; 662 } else { 663 ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "%s.%s = %d\n", 664 acpi_name(sc->tz_handle), node, *data)); 665 } 666 667 return_VOID; 668 } 669 670 /* 671 * Sanity-check a temperature value. Assume that setpoints 672 * should be between 0C and 200C. 673 */ 674 static void 675 acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what) 676 { 677 if (*val != -1 && (*val < TZ_ZEROC || *val > TZ_ZEROC + 2000)) { 678 device_printf(sc->tz_dev, "%s value is absurd, ignored (%d.%dC)\n", 679 what, TZ_KELVTOC(*val)); 680 *val = -1; 681 } 682 } 683 684 /* 685 * Respond to a sysctl on the active state node. 686 */ 687 static int 688 acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS) 689 { 690 struct acpi_tz_softc *sc; 691 int active; 692 int error; 693 694 sc = (struct acpi_tz_softc *)oidp->oid_arg1; 695 active = sc->tz_active; 696 error = sysctl_handle_int(oidp, &active, 0, req); 697 698 /* Error or no new value */ 699 if (error != 0 || req->newptr == NULL) 700 return (error); 701 if (active < -1 || active >= TZ_NUMLEVELS) 702 return (EINVAL); 703 704 /* Set new preferred level and re-switch */ 705 sc->tz_requested = active; 706 acpi_tz_signal(sc, 0); 707 return (0); 708 } 709 710 static int 711 acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS) 712 { 713 struct acpi_tz_softc *sc; 714 int enabled, error; 715 716 sc = (struct acpi_tz_softc *)oidp->oid_arg1; 717 enabled = sc->tz_cooling_enabled; 718 error = sysctl_handle_int(oidp, &enabled, 0, req); 719 720 /* Error or no new value */ 721 if (error != 0 || req->newptr == NULL) 722 return (error); 723 if (enabled != TRUE && enabled != FALSE) 724 return (EINVAL); 725 726 if (enabled) { 727 if (acpi_tz_cooling_is_available(sc)) 728 error = acpi_tz_cooling_thread_start(sc); 729 else 730 error = ENODEV; 731 if (error) 732 enabled = FALSE; 733 } 734 sc->tz_cooling_enabled = enabled; 735 return (error); 736 } 737 738 static int 739 acpi_tz_temp_sysctl(SYSCTL_HANDLER_ARGS) 740 { 741 struct acpi_tz_softc *sc; 742 int temp, *temp_ptr; 743 int error; 744 745 sc = oidp->oid_arg1; 746 temp_ptr = (int *)((uintptr_t)sc + oidp->oid_arg2); 747 temp = *temp_ptr; 748 error = sysctl_handle_int(oidp, &temp, 0, req); 749 750 /* Error or no new value */ 751 if (error != 0 || req->newptr == NULL) 752 return (error); 753 754 /* Only allow changing settings if override is set. */ 755 if (!acpi_tz_override) 756 return (EPERM); 757 758 /* Check user-supplied value for sanity. */ 759 acpi_tz_sanity(sc, &temp, "user-supplied temp"); 760 if (temp == -1) 761 return (EINVAL); 762 763 *temp_ptr = temp; 764 return (0); 765 } 766 767 static int 768 acpi_tz_passive_sysctl(SYSCTL_HANDLER_ARGS) 769 { 770 struct acpi_tz_softc *sc; 771 int val, *val_ptr; 772 int error; 773 774 sc = oidp->oid_arg1; 775 val_ptr = (int *)((uintptr_t)sc + oidp->oid_arg2); 776 val = *val_ptr; 777 error = sysctl_handle_int(oidp, &val, 0, req); 778 779 /* Error or no new value */ 780 if (error != 0 || req->newptr == NULL) 781 return (error); 782 783 /* Only allow changing settings if override is set. */ 784 if (!acpi_tz_override) 785 return (EPERM); 786 787 *val_ptr = val; 788 return (0); 789 } 790 791 static void 792 acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context) 793 { 794 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)context; 795 796 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 797 798 switch (notify) { 799 case TZ_NOTIFY_TEMPERATURE: 800 /* Temperature change occurred */ 801 acpi_tz_signal(sc, 0); 802 break; 803 case TZ_NOTIFY_DEVICES: 804 case TZ_NOTIFY_LEVELS: 805 /* Zone devices/setpoints changed */ 806 acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS); 807 break; 808 default: 809 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 810 "unknown Notify event 0x%x\n", notify); 811 break; 812 } 813 814 acpi_UserNotify("Thermal", h, notify); 815 816 return_VOID; 817 } 818 819 static void 820 acpi_tz_signal(struct acpi_tz_softc *sc, int flags) 821 { 822 ACPI_LOCK(thermal); 823 sc->tz_flags |= flags; 824 ACPI_UNLOCK(thermal); 825 wakeup(&acpi_tz_proc); 826 } 827 828 /* 829 * Notifies can be generated asynchronously but have also been seen to be 830 * triggered by other thermal methods. One system generates a notify of 831 * 0x81 when the fan is turned on or off. Another generates it when _SCP 832 * is called. To handle these situations, we check the zone via 833 * acpi_tz_monitor() before evaluating changes to setpoints or the cooling 834 * policy. 835 */ 836 static void 837 acpi_tz_timeout(struct acpi_tz_softc *sc, int flags) 838 { 839 840 /* Check the current temperature and take action based on it */ 841 acpi_tz_monitor(sc); 842 843 /* If requested, get the power profile settings. */ 844 if (flags & TZ_FLAG_GETPROFILE) 845 acpi_tz_power_profile(sc); 846 847 /* 848 * If requested, check for new devices/setpoints. After finding them, 849 * check if we need to switch fans based on the new values. 850 */ 851 if (flags & TZ_FLAG_GETSETTINGS) { 852 acpi_tz_establish(sc); 853 acpi_tz_monitor(sc); 854 } 855 856 /* XXX passive cooling actions? */ 857 } 858 859 /* 860 * System power profile may have changed; fetch and notify the 861 * thermal zone accordingly. 862 * 863 * Since this can be called from an arbitrary eventhandler, it needs 864 * to get the ACPI lock itself. 865 */ 866 static void 867 acpi_tz_power_profile(void *arg) 868 { 869 ACPI_STATUS status; 870 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg; 871 int state; 872 873 state = power_profile_get_state(); 874 if (state != POWER_PROFILE_PERFORMANCE && state != POWER_PROFILE_ECONOMY) 875 return; 876 877 /* check that we haven't decided there's no _SCP method */ 878 if ((sc->tz_flags & TZ_FLAG_NO_SCP) == 0) { 879 880 /* Call _SCP to set the new profile */ 881 status = acpi_SetInteger(sc->tz_handle, "_SCP", 882 (state == POWER_PROFILE_PERFORMANCE) ? 0 : 1); 883 if (ACPI_FAILURE(status)) { 884 if (status != AE_NOT_FOUND) 885 ACPI_VPRINT(sc->tz_dev, 886 acpi_device_get_parent_softc(sc->tz_dev), 887 "can't evaluate %s._SCP - %s\n", 888 acpi_name(sc->tz_handle), 889 AcpiFormatException(status)); 890 sc->tz_flags |= TZ_FLAG_NO_SCP; 891 } else { 892 /* We have to re-evaluate the entire zone now */ 893 acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS); 894 } 895 } 896 } 897 898 /* 899 * Thermal zone monitor thread. 900 */ 901 static void 902 acpi_tz_thread(void *arg) 903 { 904 device_t *devs; 905 int devcount, i; 906 int flags; 907 struct acpi_tz_softc **sc; 908 909 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 910 911 devs = NULL; 912 devcount = 0; 913 sc = NULL; 914 915 for (;;) { 916 /* If the number of devices has changed, re-evaluate. */ 917 if (devclass_get_count(acpi_tz_devclass) != devcount) { 918 if (devs != NULL) { 919 free(devs, M_TEMP); 920 free(sc, M_TEMP); 921 } 922 devclass_get_devices(acpi_tz_devclass, &devs, &devcount); 923 sc = malloc(sizeof(struct acpi_tz_softc *) * devcount, M_TEMP, 924 M_WAITOK | M_ZERO); 925 for (i = 0; i < devcount; i++) 926 sc[i] = device_get_softc(devs[i]); 927 } 928 929 /* Check for temperature events and act on them. */ 930 for (i = 0; i < devcount; i++) { 931 ACPI_LOCK(thermal); 932 flags = sc[i]->tz_flags; 933 sc[i]->tz_flags &= TZ_FLAG_NO_SCP; 934 ACPI_UNLOCK(thermal); 935 acpi_tz_timeout(sc[i], flags); 936 } 937 938 /* If more work to do, don't go to sleep yet. */ 939 ACPI_LOCK(thermal); 940 for (i = 0; i < devcount; i++) { 941 if (sc[i]->tz_flags & ~TZ_FLAG_NO_SCP) 942 break; 943 } 944 945 /* 946 * If we have no more work, sleep for a while, setting PDROP so that 947 * the mutex will not be reacquired. Otherwise, drop the mutex and 948 * loop to handle more events. 949 */ 950 if (i == devcount) 951 msleep(&acpi_tz_proc, &thermal_mutex, PZERO | PDROP, "tzpoll", 952 hz * acpi_tz_polling_rate); 953 else 954 ACPI_UNLOCK(thermal); 955 } 956 } 957 958 static int 959 acpi_tz_cpufreq_restore(struct acpi_tz_softc *sc) 960 { 961 device_t dev; 962 int error; 963 964 if (!sc->tz_cooling_updated) 965 return (0); 966 if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL) 967 return (ENXIO); 968 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 969 "temperature %d.%dC: resuming previous clock speed (%d MHz)\n", 970 TZ_KELVTOC(sc->tz_temperature), sc->tz_cooling_saved_freq); 971 error = CPUFREQ_SET(dev, NULL, CPUFREQ_PRIO_KERN); 972 if (error == 0) 973 sc->tz_cooling_updated = FALSE; 974 return (error); 975 } 976 977 static int 978 acpi_tz_cpufreq_update(struct acpi_tz_softc *sc, int req) 979 { 980 device_t dev; 981 struct cf_level *levels; 982 int num_levels, error, freq, desired_freq, perf, i; 983 984 levels = malloc(CPUFREQ_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT); 985 if (levels == NULL) 986 return (ENOMEM); 987 988 /* 989 * Find the main device, cpufreq0. We don't yet support independent 990 * CPU frequency control on SMP. 991 */ 992 if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL) { 993 error = ENXIO; 994 goto out; 995 } 996 997 /* Get the current frequency. */ 998 error = CPUFREQ_GET(dev, &levels[0]); 999 if (error) 1000 goto out; 1001 freq = levels[0].total_set.freq; 1002 1003 /* Get the current available frequency levels. */ 1004 num_levels = CPUFREQ_MAX_LEVELS; 1005 error = CPUFREQ_LEVELS(dev, levels, &num_levels); 1006 if (error) { 1007 if (error == E2BIG) 1008 printf("cpufreq: need to increase CPUFREQ_MAX_LEVELS\n"); 1009 goto out; 1010 } 1011 1012 /* Calculate the desired frequency as a percent of the max frequency. */ 1013 perf = 100 * freq / levels[0].total_set.freq - req; 1014 if (perf < 0) 1015 perf = 0; 1016 else if (perf > 100) 1017 perf = 100; 1018 desired_freq = levels[0].total_set.freq * perf / 100; 1019 1020 if (desired_freq < freq) { 1021 /* Find the closest available frequency, rounding down. */ 1022 for (i = 0; i < num_levels; i++) 1023 if (levels[i].total_set.freq <= desired_freq) 1024 break; 1025 1026 /* If we didn't find a relevant setting, use the lowest. */ 1027 if (i == num_levels) 1028 i--; 1029 } else { 1030 /* If we didn't decrease frequency yet, don't increase it. */ 1031 if (!sc->tz_cooling_updated) { 1032 sc->tz_cooling_active = FALSE; 1033 goto out; 1034 } 1035 1036 /* Use saved cpu frequency as maximum value. */ 1037 if (desired_freq > sc->tz_cooling_saved_freq) 1038 desired_freq = sc->tz_cooling_saved_freq; 1039 1040 /* Find the closest available frequency, rounding up. */ 1041 for (i = num_levels - 1; i >= 0; i--) 1042 if (levels[i].total_set.freq >= desired_freq) 1043 break; 1044 1045 /* If we didn't find a relevant setting, use the highest. */ 1046 if (i == -1) 1047 i++; 1048 1049 /* If we're going to the highest frequency, restore the old setting. */ 1050 if (i == 0 || desired_freq == sc->tz_cooling_saved_freq) { 1051 error = acpi_tz_cpufreq_restore(sc); 1052 if (error == 0) 1053 sc->tz_cooling_active = FALSE; 1054 goto out; 1055 } 1056 } 1057 1058 /* If we are going to a new frequency, activate it. */ 1059 if (levels[i].total_set.freq != freq) { 1060 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 1061 "temperature %d.%dC: %screasing clock speed " 1062 "from %d MHz to %d MHz\n", 1063 TZ_KELVTOC(sc->tz_temperature), 1064 (freq > levels[i].total_set.freq) ? "de" : "in", 1065 freq, levels[i].total_set.freq); 1066 error = CPUFREQ_SET(dev, &levels[i], CPUFREQ_PRIO_KERN); 1067 if (error == 0 && !sc->tz_cooling_updated) { 1068 sc->tz_cooling_saved_freq = freq; 1069 sc->tz_cooling_updated = TRUE; 1070 } 1071 } 1072 1073 out: 1074 if (levels) 1075 free(levels, M_TEMP); 1076 return (error); 1077 } 1078 1079 /* 1080 * Passive cooling thread; monitors current temperature according to the 1081 * cooling interval and calculates whether to scale back CPU frequency. 1082 */ 1083 static void 1084 acpi_tz_cooling_thread(void *arg) 1085 { 1086 struct acpi_tz_softc *sc; 1087 int error, perf, curr_temp, prev_temp; 1088 1089 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 1090 1091 sc = (struct acpi_tz_softc *)arg; 1092 1093 prev_temp = sc->tz_temperature; 1094 while (sc->tz_cooling_enabled) { 1095 if (sc->tz_cooling_active) 1096 (void)acpi_tz_get_temperature(sc); 1097 curr_temp = sc->tz_temperature; 1098 if (curr_temp >= sc->tz_zone.psv) 1099 sc->tz_cooling_active = TRUE; 1100 if (sc->tz_cooling_active) { 1101 perf = sc->tz_zone.tc1 * (curr_temp - prev_temp) + 1102 sc->tz_zone.tc2 * (curr_temp - sc->tz_zone.psv); 1103 perf /= 10; 1104 1105 if (perf != 0) { 1106 error = acpi_tz_cpufreq_update(sc, perf); 1107 1108 /* 1109 * If error and not simply a higher priority setting was 1110 * active, disable cooling. 1111 */ 1112 if (error != 0 && error != EPERM) { 1113 device_printf(sc->tz_dev, 1114 "failed to set new freq, disabling passive cooling\n"); 1115 sc->tz_cooling_enabled = FALSE; 1116 } 1117 } 1118 } 1119 prev_temp = curr_temp; 1120 tsleep(&sc->tz_cooling_proc, PZERO, "cooling", 1121 hz * sc->tz_zone.tsp / 10); 1122 } 1123 if (sc->tz_cooling_active) { 1124 acpi_tz_cpufreq_restore(sc); 1125 sc->tz_cooling_active = FALSE; 1126 } 1127 sc->tz_cooling_proc = NULL; 1128 ACPI_LOCK(thermal); 1129 sc->tz_cooling_proc_running = FALSE; 1130 ACPI_UNLOCK(thermal); 1131 kproc_exit(0); 1132 } 1133 1134 /* 1135 * TODO: We ignore _PSL (list of cooling devices) since cpufreq enumerates 1136 * all CPUs for us. However, it's possible in the future _PSL will 1137 * reference non-CPU devices so we may want to support it then. 1138 */ 1139 static int 1140 acpi_tz_cooling_is_available(struct acpi_tz_softc *sc) 1141 { 1142 return (sc->tz_zone.tc1 != -1 && sc->tz_zone.tc2 != -1 && 1143 sc->tz_zone.tsp != -1 && sc->tz_zone.tsp != 0 && 1144 sc->tz_zone.psv != -1); 1145 } 1146 1147 static int 1148 acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc) 1149 { 1150 int error; 1151 char name[16]; 1152 1153 ACPI_LOCK(thermal); 1154 if (sc->tz_cooling_proc_running) { 1155 ACPI_UNLOCK(thermal); 1156 return (0); 1157 } 1158 sc->tz_cooling_proc_running = TRUE; 1159 ACPI_UNLOCK(thermal); 1160 error = 0; 1161 if (sc->tz_cooling_proc == NULL) { 1162 snprintf(name, sizeof(name), "acpi_cooling%d", 1163 device_get_unit(sc->tz_dev)); 1164 error = kproc_create(acpi_tz_cooling_thread, sc, 1165 &sc->tz_cooling_proc, RFHIGHPID, 0, name); 1166 if (error != 0) { 1167 device_printf(sc->tz_dev, "could not create thread - %d", error); 1168 ACPI_LOCK(thermal); 1169 sc->tz_cooling_proc_running = FALSE; 1170 ACPI_UNLOCK(thermal); 1171 } 1172 } 1173 return (error); 1174 } 1175