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/eventhandler.h> 34 #include <sys/kernel.h> 35 #include <sys/bus.h> 36 #include <sys/cpu.h> 37 #include <sys/kthread.h> 38 #include <sys/malloc.h> 39 #include <sys/module.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/include/acpi.h> 49 #include <contrib/dev/acpica/include/accommon.h> 50 51 #include <dev/acpica/acpivar.h> 52 53 /* Hooks for the ACPI CA debugging infrastructure */ 54 #define _COMPONENT ACPI_THERMAL 55 ACPI_MODULE_NAME("THERMAL") 56 57 #define TZ_ZEROC 2731 58 #define TZ_KELVTOC(x) (((x) - TZ_ZEROC) / 10), abs(((x) - TZ_ZEROC) % 10) 59 60 #define TZ_NOTIFY_TEMPERATURE 0x80 /* Temperature changed. */ 61 #define TZ_NOTIFY_LEVELS 0x81 /* Cooling levels changed. */ 62 #define TZ_NOTIFY_DEVICES 0x82 /* Device lists changed. */ 63 #define TZ_NOTIFY_CRITICAL 0xcc /* Fake notify that _CRT/_HOT reached. */ 64 65 /* Check for temperature changes every 10 seconds by default */ 66 #define TZ_POLLRATE 10 67 68 /* Make sure the reported temperature is valid for this number of polls. */ 69 #define TZ_VALIDCHECKS 3 70 71 /* Notify the user we will be shutting down in one more poll cycle. */ 72 #define TZ_NOTIFYCOUNT (TZ_VALIDCHECKS - 1) 73 74 /* ACPI spec defines this */ 75 #define TZ_NUMLEVELS 10 76 struct acpi_tz_zone { 77 int ac[TZ_NUMLEVELS]; 78 ACPI_BUFFER al[TZ_NUMLEVELS]; 79 int crt; 80 int hot; 81 ACPI_BUFFER psl; 82 int psv; 83 int tc1; 84 int tc2; 85 int tsp; 86 int tzp; 87 }; 88 89 struct acpi_tz_softc { 90 device_t tz_dev; 91 ACPI_HANDLE tz_handle; /*Thermal zone handle*/ 92 int tz_temperature; /*Current temperature*/ 93 int tz_active; /*Current active cooling*/ 94 #define TZ_ACTIVE_NONE -1 95 #define TZ_ACTIVE_UNKNOWN -2 96 int tz_requested; /*Minimum active cooling*/ 97 int tz_thflags; /*Current temp-related flags*/ 98 #define TZ_THFLAG_NONE 0 99 #define TZ_THFLAG_PSV (1<<0) 100 #define TZ_THFLAG_HOT (1<<2) 101 #define TZ_THFLAG_CRT (1<<3) 102 int tz_flags; 103 #define TZ_FLAG_NO_SCP (1<<0) /*No _SCP method*/ 104 #define TZ_FLAG_GETPROFILE (1<<1) /*Get power_profile in timeout*/ 105 #define TZ_FLAG_GETSETTINGS (1<<2) /*Get devs/setpoints*/ 106 struct timespec tz_cooling_started; 107 /*Current cooling starting time*/ 108 109 struct sysctl_ctx_list tz_sysctl_ctx; 110 struct sysctl_oid *tz_sysctl_tree; 111 eventhandler_tag tz_event; 112 113 struct acpi_tz_zone tz_zone; /*Thermal zone parameters*/ 114 int tz_validchecks; 115 int tz_insane_tmp_notified; 116 117 /* passive cooling */ 118 struct proc *tz_cooling_proc; 119 int tz_cooling_proc_running; 120 int tz_cooling_enabled; 121 int tz_cooling_active; 122 int tz_cooling_updated; 123 int tz_cooling_saved_freq; 124 }; 125 126 #define TZ_ACTIVE_LEVEL(act) ((act) >= 0 ? (act) : TZ_NUMLEVELS) 127 128 #define CPUFREQ_MAX_LEVELS 64 /* XXX cpufreq should export this */ 129 130 static int acpi_tz_probe(device_t dev); 131 static int acpi_tz_attach(device_t dev); 132 static int acpi_tz_establish(struct acpi_tz_softc *sc); 133 static void acpi_tz_monitor(void *Context); 134 static void acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg); 135 static void acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg); 136 static void acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, 137 int *data); 138 static void acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what); 139 static int acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS); 140 static int acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS); 141 static int acpi_tz_temp_sysctl(SYSCTL_HANDLER_ARGS); 142 static int acpi_tz_passive_sysctl(SYSCTL_HANDLER_ARGS); 143 static void acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, 144 void *context); 145 static void acpi_tz_signal(struct acpi_tz_softc *sc, int flags); 146 static void acpi_tz_timeout(struct acpi_tz_softc *sc, int flags); 147 static void acpi_tz_power_profile(void *arg); 148 static void acpi_tz_thread(void *arg); 149 static int acpi_tz_cooling_is_available(struct acpi_tz_softc *sc); 150 static int acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc); 151 152 static device_method_t acpi_tz_methods[] = { 153 /* Device interface */ 154 DEVMETHOD(device_probe, acpi_tz_probe), 155 DEVMETHOD(device_attach, acpi_tz_attach), 156 157 DEVMETHOD_END 158 }; 159 160 static driver_t acpi_tz_driver = { 161 "acpi_tz", 162 acpi_tz_methods, 163 sizeof(struct acpi_tz_softc), 164 }; 165 166 static char *acpi_tz_tmp_name = "_TMP"; 167 168 static devclass_t acpi_tz_devclass; 169 DRIVER_MODULE(acpi_tz, acpi, acpi_tz_driver, acpi_tz_devclass, 0, 0); 170 MODULE_DEPEND(acpi_tz, acpi, 1, 1, 1); 171 172 static struct sysctl_ctx_list acpi_tz_sysctl_ctx; 173 static struct sysctl_oid *acpi_tz_sysctl_tree; 174 175 /* Minimum cooling run time */ 176 static int acpi_tz_min_runtime; 177 static int acpi_tz_polling_rate = TZ_POLLRATE; 178 static int acpi_tz_override; 179 180 /* Timezone polling thread */ 181 static struct proc *acpi_tz_proc; 182 ACPI_LOCK_DECL(thermal, "ACPI thermal zone"); 183 184 static int acpi_tz_cooling_unit = -1; 185 186 static int 187 acpi_tz_probe(device_t dev) 188 { 189 int result; 190 191 if (acpi_get_type(dev) == ACPI_TYPE_THERMAL && !acpi_disabled("thermal")) { 192 device_set_desc(dev, "Thermal Zone"); 193 result = -10; 194 } else 195 result = ENXIO; 196 return (result); 197 } 198 199 static int 200 acpi_tz_attach(device_t dev) 201 { 202 struct acpi_tz_softc *sc; 203 struct acpi_softc *acpi_sc; 204 int error; 205 char oidname[8]; 206 207 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 208 209 sc = device_get_softc(dev); 210 sc->tz_dev = dev; 211 sc->tz_handle = acpi_get_handle(dev); 212 sc->tz_requested = TZ_ACTIVE_NONE; 213 sc->tz_active = TZ_ACTIVE_UNKNOWN; 214 sc->tz_thflags = TZ_THFLAG_NONE; 215 sc->tz_cooling_proc = NULL; 216 sc->tz_cooling_proc_running = FALSE; 217 sc->tz_cooling_active = FALSE; 218 sc->tz_cooling_updated = FALSE; 219 sc->tz_cooling_enabled = FALSE; 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), OID_AUTO, "thermal", 245 CTLFLAG_RD | CTLFLAG_MPSAFE, 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 interval in seconds"); 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_WITH_LABEL(&sc->tz_sysctl_ctx, 263 SYSCTL_CHILDREN(acpi_tz_sysctl_tree), OID_AUTO, oidname, 264 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "", "thermal_zone"); 265 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 266 OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT, 267 &sc->tz_temperature, 0, sysctl_handle_int, "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 | CTLFLAG_NEEDGIANT, sc, 271 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", 274 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, 275 acpi_tz_cooling_sysctl, "I", 276 "enable passive (speed reduction) cooling"); 277 278 SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 279 OID_AUTO, "thermal_flags", CTLFLAG_RD, 280 &sc->tz_thflags, 0, "thermal zone flags"); 281 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 282 OID_AUTO, "_PSV", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 283 offsetof(struct acpi_tz_softc, tz_zone.psv), acpi_tz_temp_sysctl, "IK", 284 "passive cooling temp setpoint"); 285 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 286 OID_AUTO, "_HOT", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 287 offsetof(struct acpi_tz_softc, tz_zone.hot), 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 | CTLFLAG_NEEDGIANT, sc, 291 offsetof(struct acpi_tz_softc, tz_zone.crt), acpi_tz_temp_sysctl, "IK", 292 "critical temp setpoint (shutdown now)"); 293 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 294 OID_AUTO, "_ACx", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT, 295 &sc->tz_zone.ac, sizeof(sc->tz_zone.ac), sysctl_handle_opaque, "IK", 296 ""); 297 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 298 OID_AUTO, "_TC1", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 299 offsetof(struct acpi_tz_softc, tz_zone.tc1), acpi_tz_passive_sysctl, 300 "I", "thermal constant 1 for passive cooling"); 301 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 302 OID_AUTO, "_TC2", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 303 offsetof(struct acpi_tz_softc, tz_zone.tc2), acpi_tz_passive_sysctl, 304 "I", "thermal constant 2 for passive cooling"); 305 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree), 306 OID_AUTO, "_TSP", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 307 offsetof(struct acpi_tz_softc, tz_zone.tsp), acpi_tz_passive_sysctl, 308 "I", "thermal sampling period for passive cooling"); 309 310 /* 311 * Register our power profile event handler. 312 */ 313 sc->tz_event = EVENTHANDLER_REGISTER(power_profile_change, 314 acpi_tz_power_profile, sc, 0); 315 316 /* 317 * Flag the event handler for a manual invocation by our timeout. 318 * We defer it like this so that the rest of the subsystem has time 319 * to come up. Don't bother evaluating/printing the temperature at 320 * this point; on many systems it'll be bogus until the EC is running. 321 */ 322 sc->tz_flags |= TZ_FLAG_GETPROFILE; 323 324 return_VALUE (0); 325 } 326 327 static void 328 acpi_tz_startup(void *arg __unused) 329 { 330 struct acpi_tz_softc *sc; 331 device_t *devs; 332 int devcount, error, i; 333 334 devclass_get_devices(acpi_tz_devclass, &devs, &devcount); 335 if (devcount == 0) { 336 free(devs, M_TEMP); 337 return; 338 } 339 340 /* 341 * Create thread to service all of the thermal zones. 342 */ 343 error = kproc_create(acpi_tz_thread, NULL, &acpi_tz_proc, RFHIGHPID, 0, 344 "acpi_thermal"); 345 if (error != 0) 346 printf("acpi_tz: could not create thread - %d", error); 347 348 /* 349 * Create a thread to handle passive cooling for 1st zone which 350 * has _PSV, _TSP, _TC1 and _TC2. Users can enable it for other 351 * zones manually for now. 352 * 353 * XXX We enable only one zone to avoid multiple zones conflict 354 * with each other since cpufreq currently sets all CPUs to the 355 * given frequency whereas it's possible for different thermal 356 * zones to specify independent settings for multiple CPUs. 357 */ 358 for (i = 0; i < devcount; i++) { 359 sc = device_get_softc(devs[i]); 360 if (acpi_tz_cooling_is_available(sc)) { 361 sc->tz_cooling_enabled = TRUE; 362 error = acpi_tz_cooling_thread_start(sc); 363 if (error != 0) { 364 sc->tz_cooling_enabled = FALSE; 365 break; 366 } 367 acpi_tz_cooling_unit = device_get_unit(devs[i]); 368 break; 369 } 370 } 371 free(devs, M_TEMP); 372 } 373 SYSINIT(acpi_tz, SI_SUB_KICK_SCHEDULER, SI_ORDER_ANY, acpi_tz_startup, NULL); 374 375 /* 376 * Parse the current state of this thermal zone and set up to use it. 377 * 378 * Note that we may have previous state, which will have to be discarded. 379 */ 380 static int 381 acpi_tz_establish(struct acpi_tz_softc *sc) 382 { 383 ACPI_OBJECT *obj; 384 int i; 385 char nbuf[8]; 386 387 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 388 389 /* Erase any existing state. */ 390 for (i = 0; i < TZ_NUMLEVELS; i++) 391 if (sc->tz_zone.al[i].Pointer != NULL) 392 AcpiOsFree(sc->tz_zone.al[i].Pointer); 393 if (sc->tz_zone.psl.Pointer != NULL) 394 AcpiOsFree(sc->tz_zone.psl.Pointer); 395 396 /* 397 * XXX: We initialize only ACPI_BUFFER to avoid race condition 398 * with passive cooling thread which refers psv, tc1, tc2 and tsp. 399 */ 400 bzero(sc->tz_zone.ac, sizeof(sc->tz_zone.ac)); 401 bzero(sc->tz_zone.al, sizeof(sc->tz_zone.al)); 402 bzero(&sc->tz_zone.psl, sizeof(sc->tz_zone.psl)); 403 404 /* Evaluate thermal zone parameters. */ 405 for (i = 0; i < TZ_NUMLEVELS; i++) { 406 sprintf(nbuf, "_AC%d", i); 407 acpi_tz_getparam(sc, nbuf, &sc->tz_zone.ac[i]); 408 sprintf(nbuf, "_AL%d", i); 409 sc->tz_zone.al[i].Length = ACPI_ALLOCATE_BUFFER; 410 sc->tz_zone.al[i].Pointer = NULL; 411 AcpiEvaluateObject(sc->tz_handle, nbuf, NULL, &sc->tz_zone.al[i]); 412 obj = (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer; 413 if (obj != NULL) { 414 /* Should be a package containing a list of power objects */ 415 if (obj->Type != ACPI_TYPE_PACKAGE) { 416 device_printf(sc->tz_dev, "%s has unknown type %d, rejecting\n", 417 nbuf, obj->Type); 418 return_VALUE (ENXIO); 419 } 420 } 421 } 422 acpi_tz_getparam(sc, "_CRT", &sc->tz_zone.crt); 423 acpi_tz_getparam(sc, "_HOT", &sc->tz_zone.hot); 424 sc->tz_zone.psl.Length = ACPI_ALLOCATE_BUFFER; 425 sc->tz_zone.psl.Pointer = NULL; 426 AcpiEvaluateObject(sc->tz_handle, "_PSL", NULL, &sc->tz_zone.psl); 427 acpi_tz_getparam(sc, "_PSV", &sc->tz_zone.psv); 428 acpi_tz_getparam(sc, "_TC1", &sc->tz_zone.tc1); 429 acpi_tz_getparam(sc, "_TC2", &sc->tz_zone.tc2); 430 acpi_tz_getparam(sc, "_TSP", &sc->tz_zone.tsp); 431 acpi_tz_getparam(sc, "_TZP", &sc->tz_zone.tzp); 432 433 /* 434 * Sanity-check the values we've been given. 435 * 436 * XXX what do we do about systems that give us the same value for 437 * more than one of these setpoints? 438 */ 439 acpi_tz_sanity(sc, &sc->tz_zone.crt, "_CRT"); 440 acpi_tz_sanity(sc, &sc->tz_zone.hot, "_HOT"); 441 acpi_tz_sanity(sc, &sc->tz_zone.psv, "_PSV"); 442 for (i = 0; i < TZ_NUMLEVELS; i++) 443 acpi_tz_sanity(sc, &sc->tz_zone.ac[i], "_ACx"); 444 445 return_VALUE (0); 446 } 447 448 static char *aclevel_string[] = { 449 "NONE", "_AC0", "_AC1", "_AC2", "_AC3", "_AC4", 450 "_AC5", "_AC6", "_AC7", "_AC8", "_AC9" 451 }; 452 453 static __inline const char * 454 acpi_tz_aclevel_string(int active) 455 { 456 if (active < -1 || active >= TZ_NUMLEVELS) 457 return (aclevel_string[0]); 458 459 return (aclevel_string[active + 1]); 460 } 461 462 /* 463 * Get the current temperature. 464 */ 465 static int 466 acpi_tz_get_temperature(struct acpi_tz_softc *sc) 467 { 468 int temp; 469 ACPI_STATUS status; 470 471 ACPI_FUNCTION_NAME ("acpi_tz_get_temperature"); 472 473 /* Evaluate the thermal zone's _TMP method. */ 474 status = acpi_GetInteger(sc->tz_handle, acpi_tz_tmp_name, &temp); 475 if (ACPI_FAILURE(status)) { 476 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 477 "error fetching current temperature -- %s\n", 478 AcpiFormatException(status)); 479 return (FALSE); 480 } 481 482 /* Check it for validity. */ 483 acpi_tz_sanity(sc, &temp, acpi_tz_tmp_name); 484 if (temp == -1) 485 return (FALSE); 486 487 ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "got %d.%dC\n", TZ_KELVTOC(temp))); 488 sc->tz_temperature = temp; 489 return (TRUE); 490 } 491 492 /* 493 * Evaluate the condition of a thermal zone, take appropriate actions. 494 */ 495 static void 496 acpi_tz_monitor(void *Context) 497 { 498 struct acpi_tz_softc *sc; 499 struct timespec curtime; 500 int temp; 501 int i; 502 int newactive, newflags; 503 504 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 505 506 sc = (struct acpi_tz_softc *)Context; 507 508 /* Get the current temperature. */ 509 if (!acpi_tz_get_temperature(sc)) { 510 /* XXX disable zone? go to max cooling? */ 511 return_VOID; 512 } 513 temp = sc->tz_temperature; 514 515 /* 516 * Work out what we ought to be doing right now. 517 * 518 * Note that the _ACx levels sort from hot to cold. 519 */ 520 newactive = TZ_ACTIVE_NONE; 521 for (i = TZ_NUMLEVELS - 1; i >= 0; i--) { 522 if (sc->tz_zone.ac[i] != -1 && temp >= sc->tz_zone.ac[i]) 523 newactive = i; 524 } 525 526 /* 527 * We are going to get _ACx level down (colder side), but give a guaranteed 528 * minimum cooling run time if requested. 529 */ 530 if (acpi_tz_min_runtime > 0 && sc->tz_active != TZ_ACTIVE_NONE && 531 sc->tz_active != TZ_ACTIVE_UNKNOWN && 532 (newactive == TZ_ACTIVE_NONE || newactive > sc->tz_active)) { 533 534 getnanotime(&curtime); 535 timespecsub(&curtime, &sc->tz_cooling_started, &curtime); 536 if (curtime.tv_sec < acpi_tz_min_runtime) 537 newactive = sc->tz_active; 538 } 539 540 /* Handle user override of active mode */ 541 if (sc->tz_requested != TZ_ACTIVE_NONE && (newactive == TZ_ACTIVE_NONE 542 || sc->tz_requested < newactive)) 543 newactive = sc->tz_requested; 544 545 /* update temperature-related flags */ 546 newflags = TZ_THFLAG_NONE; 547 if (sc->tz_zone.psv != -1 && temp >= sc->tz_zone.psv) 548 newflags |= TZ_THFLAG_PSV; 549 if (sc->tz_zone.hot != -1 && temp >= sc->tz_zone.hot) 550 newflags |= TZ_THFLAG_HOT; 551 if (sc->tz_zone.crt != -1 && temp >= sc->tz_zone.crt) 552 newflags |= TZ_THFLAG_CRT; 553 554 /* If the active cooling state has changed, we have to switch things. */ 555 if (sc->tz_active == TZ_ACTIVE_UNKNOWN) { 556 /* 557 * We don't know which cooling device is on or off, 558 * so stop them all, because we now know which 559 * should be on (if any). 560 */ 561 for (i = 0; i < TZ_NUMLEVELS; i++) { 562 if (sc->tz_zone.al[i].Pointer != NULL) { 563 acpi_ForeachPackageObject( 564 (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer, 565 acpi_tz_switch_cooler_off, sc); 566 } 567 } 568 /* now we know that all devices are off */ 569 sc->tz_active = TZ_ACTIVE_NONE; 570 } 571 572 if (newactive != sc->tz_active) { 573 /* Turn off unneeded cooling devices that are on, if any are */ 574 for (i = TZ_ACTIVE_LEVEL(sc->tz_active); 575 i < TZ_ACTIVE_LEVEL(newactive); i++) { 576 acpi_ForeachPackageObject( 577 (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer, 578 acpi_tz_switch_cooler_off, sc); 579 } 580 /* Turn on cooling devices that are required, if any are */ 581 for (i = TZ_ACTIVE_LEVEL(sc->tz_active) - 1; 582 i >= TZ_ACTIVE_LEVEL(newactive); i--) { 583 acpi_ForeachPackageObject( 584 (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer, 585 acpi_tz_switch_cooler_on, sc); 586 } 587 588 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 589 "switched from %s to %s: %d.%dC\n", 590 acpi_tz_aclevel_string(sc->tz_active), 591 acpi_tz_aclevel_string(newactive), TZ_KELVTOC(temp)); 592 sc->tz_active = newactive; 593 getnanotime(&sc->tz_cooling_started); 594 } 595 596 /* XXX (de)activate any passive cooling that may be required. */ 597 598 /* 599 * If the temperature is at _HOT or _CRT, increment our event count. 600 * If it has occurred enough times, shutdown the system. This is 601 * needed because some systems will report an invalid high temperature 602 * for one poll cycle. It is suspected this is due to the embedded 603 * controller timing out. A typical value is 138C for one cycle on 604 * a system that is otherwise 65C. 605 * 606 * If we're almost at that threshold, notify the user through devd(8). 607 */ 608 if ((newflags & (TZ_THFLAG_HOT | TZ_THFLAG_CRT)) != 0) { 609 sc->tz_validchecks++; 610 if (sc->tz_validchecks == TZ_VALIDCHECKS) { 611 device_printf(sc->tz_dev, 612 "WARNING - current temperature (%d.%dC) exceeds safe limits\n", 613 TZ_KELVTOC(sc->tz_temperature)); 614 shutdown_nice(RB_POWEROFF); 615 } else if (sc->tz_validchecks == TZ_NOTIFYCOUNT) 616 acpi_UserNotify("Thermal", sc->tz_handle, TZ_NOTIFY_CRITICAL); 617 } else { 618 sc->tz_validchecks = 0; 619 } 620 sc->tz_thflags = newflags; 621 622 return_VOID; 623 } 624 625 /* 626 * Given an object, verify that it's a reference to a device of some sort, 627 * and try to switch it off. 628 */ 629 static void 630 acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg) 631 { 632 ACPI_HANDLE cooler; 633 634 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 635 636 cooler = acpi_GetReference(NULL, obj); 637 if (cooler == NULL) { 638 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n")); 639 return_VOID; 640 } 641 642 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s off\n", 643 acpi_name(cooler))); 644 acpi_pwr_switch_consumer(cooler, ACPI_STATE_D3); 645 646 return_VOID; 647 } 648 649 /* 650 * Given an object, verify that it's a reference to a device of some sort, 651 * and try to switch it on. 652 * 653 * XXX replication of off/on function code is bad. 654 */ 655 static void 656 acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg) 657 { 658 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg; 659 ACPI_HANDLE cooler; 660 ACPI_STATUS status; 661 662 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 663 664 cooler = acpi_GetReference(NULL, obj); 665 if (cooler == NULL) { 666 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n")); 667 return_VOID; 668 } 669 670 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s on\n", 671 acpi_name(cooler))); 672 status = acpi_pwr_switch_consumer(cooler, ACPI_STATE_D0); 673 if (ACPI_FAILURE(status)) { 674 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 675 "failed to activate %s - %s\n", acpi_name(cooler), 676 AcpiFormatException(status)); 677 } 678 679 return_VOID; 680 } 681 682 /* 683 * Read/debug-print a parameter, default it to -1. 684 */ 685 static void 686 acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data) 687 { 688 689 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 690 691 if (ACPI_FAILURE(acpi_GetInteger(sc->tz_handle, node, data))) { 692 *data = -1; 693 } else { 694 ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "%s.%s = %d\n", 695 acpi_name(sc->tz_handle), node, *data)); 696 } 697 698 return_VOID; 699 } 700 701 /* 702 * Sanity-check a temperature value. Assume that setpoints 703 * should be between 0C and 200C. 704 */ 705 static void 706 acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what) 707 { 708 if (*val != -1 && (*val < TZ_ZEROC || *val > TZ_ZEROC + 2000)) { 709 /* 710 * If the value we are checking is _TMP, warn the user only 711 * once. This avoids spamming messages if, for instance, the 712 * sensor is broken and always returns an invalid temperature. 713 * 714 * This is only done for _TMP; other values always emit a 715 * warning. 716 */ 717 if (what != acpi_tz_tmp_name || !sc->tz_insane_tmp_notified) { 718 device_printf(sc->tz_dev, "%s value is absurd, ignored (%d.%dC)\n", 719 what, TZ_KELVTOC(*val)); 720 721 /* Don't warn the user again if the read value doesn't improve. */ 722 if (what == acpi_tz_tmp_name) 723 sc->tz_insane_tmp_notified = 1; 724 } 725 *val = -1; 726 return; 727 } 728 729 /* This value is correct. Warn if it's incorrect again. */ 730 if (what == acpi_tz_tmp_name) 731 sc->tz_insane_tmp_notified = 0; 732 } 733 734 /* 735 * Respond to a sysctl on the active state node. 736 */ 737 static int 738 acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS) 739 { 740 struct acpi_tz_softc *sc; 741 int active; 742 int error; 743 744 sc = (struct acpi_tz_softc *)oidp->oid_arg1; 745 active = sc->tz_active; 746 error = sysctl_handle_int(oidp, &active, 0, req); 747 748 /* Error or no new value */ 749 if (error != 0 || req->newptr == NULL) 750 return (error); 751 if (active < -1 || active >= TZ_NUMLEVELS) 752 return (EINVAL); 753 754 /* Set new preferred level and re-switch */ 755 sc->tz_requested = active; 756 acpi_tz_signal(sc, 0); 757 return (0); 758 } 759 760 static int 761 acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS) 762 { 763 struct acpi_tz_softc *sc; 764 int enabled, error; 765 766 sc = (struct acpi_tz_softc *)oidp->oid_arg1; 767 enabled = sc->tz_cooling_enabled; 768 error = sysctl_handle_int(oidp, &enabled, 0, req); 769 770 /* Error or no new value */ 771 if (error != 0 || req->newptr == NULL) 772 return (error); 773 if (enabled != TRUE && enabled != FALSE) 774 return (EINVAL); 775 776 if (enabled) { 777 if (acpi_tz_cooling_is_available(sc)) 778 error = acpi_tz_cooling_thread_start(sc); 779 else 780 error = ENODEV; 781 if (error) 782 enabled = FALSE; 783 } 784 sc->tz_cooling_enabled = enabled; 785 return (error); 786 } 787 788 static int 789 acpi_tz_temp_sysctl(SYSCTL_HANDLER_ARGS) 790 { 791 struct acpi_tz_softc *sc; 792 int temp, *temp_ptr; 793 int error; 794 795 sc = oidp->oid_arg1; 796 temp_ptr = (int *)(void *)(uintptr_t)((uintptr_t)sc + oidp->oid_arg2); 797 temp = *temp_ptr; 798 error = sysctl_handle_int(oidp, &temp, 0, req); 799 800 /* Error or no new value */ 801 if (error != 0 || req->newptr == NULL) 802 return (error); 803 804 /* Only allow changing settings if override is set. */ 805 if (!acpi_tz_override) 806 return (EPERM); 807 808 /* Check user-supplied value for sanity. */ 809 acpi_tz_sanity(sc, &temp, "user-supplied temp"); 810 if (temp == -1) 811 return (EINVAL); 812 813 *temp_ptr = temp; 814 return (0); 815 } 816 817 static int 818 acpi_tz_passive_sysctl(SYSCTL_HANDLER_ARGS) 819 { 820 struct acpi_tz_softc *sc; 821 int val, *val_ptr; 822 int error; 823 824 sc = oidp->oid_arg1; 825 val_ptr = (int *)(void *)(uintptr_t)((uintptr_t)sc + oidp->oid_arg2); 826 val = *val_ptr; 827 error = sysctl_handle_int(oidp, &val, 0, req); 828 829 /* Error or no new value */ 830 if (error != 0 || req->newptr == NULL) 831 return (error); 832 833 /* Only allow changing settings if override is set. */ 834 if (!acpi_tz_override) 835 return (EPERM); 836 837 *val_ptr = val; 838 return (0); 839 } 840 841 static void 842 acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context) 843 { 844 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)context; 845 846 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 847 848 switch (notify) { 849 case TZ_NOTIFY_TEMPERATURE: 850 /* Temperature change occurred */ 851 acpi_tz_signal(sc, 0); 852 break; 853 case TZ_NOTIFY_DEVICES: 854 case TZ_NOTIFY_LEVELS: 855 /* Zone devices/setpoints changed */ 856 acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS); 857 break; 858 default: 859 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 860 "unknown Notify event 0x%x\n", notify); 861 break; 862 } 863 864 acpi_UserNotify("Thermal", h, notify); 865 866 return_VOID; 867 } 868 869 static void 870 acpi_tz_signal(struct acpi_tz_softc *sc, int flags) 871 { 872 ACPI_LOCK(thermal); 873 sc->tz_flags |= flags; 874 ACPI_UNLOCK(thermal); 875 wakeup(&acpi_tz_proc); 876 } 877 878 /* 879 * Notifies can be generated asynchronously but have also been seen to be 880 * triggered by other thermal methods. One system generates a notify of 881 * 0x81 when the fan is turned on or off. Another generates it when _SCP 882 * is called. To handle these situations, we check the zone via 883 * acpi_tz_monitor() before evaluating changes to setpoints or the cooling 884 * policy. 885 */ 886 static void 887 acpi_tz_timeout(struct acpi_tz_softc *sc, int flags) 888 { 889 890 /* Check the current temperature and take action based on it */ 891 acpi_tz_monitor(sc); 892 893 /* If requested, get the power profile settings. */ 894 if (flags & TZ_FLAG_GETPROFILE) 895 acpi_tz_power_profile(sc); 896 897 /* 898 * If requested, check for new devices/setpoints. After finding them, 899 * check if we need to switch fans based on the new values. 900 */ 901 if (flags & TZ_FLAG_GETSETTINGS) { 902 acpi_tz_establish(sc); 903 acpi_tz_monitor(sc); 904 } 905 906 /* XXX passive cooling actions? */ 907 } 908 909 /* 910 * System power profile may have changed; fetch and notify the 911 * thermal zone accordingly. 912 * 913 * Since this can be called from an arbitrary eventhandler, it needs 914 * to get the ACPI lock itself. 915 */ 916 static void 917 acpi_tz_power_profile(void *arg) 918 { 919 ACPI_STATUS status; 920 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg; 921 int state; 922 923 state = power_profile_get_state(); 924 if (state != POWER_PROFILE_PERFORMANCE && state != POWER_PROFILE_ECONOMY) 925 return; 926 927 /* check that we haven't decided there's no _SCP method */ 928 if ((sc->tz_flags & TZ_FLAG_NO_SCP) == 0) { 929 930 /* Call _SCP to set the new profile */ 931 status = acpi_SetInteger(sc->tz_handle, "_SCP", 932 (state == POWER_PROFILE_PERFORMANCE) ? 0 : 1); 933 if (ACPI_FAILURE(status)) { 934 if (status != AE_NOT_FOUND) 935 ACPI_VPRINT(sc->tz_dev, 936 acpi_device_get_parent_softc(sc->tz_dev), 937 "can't evaluate %s._SCP - %s\n", 938 acpi_name(sc->tz_handle), 939 AcpiFormatException(status)); 940 sc->tz_flags |= TZ_FLAG_NO_SCP; 941 } else { 942 /* We have to re-evaluate the entire zone now */ 943 acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS); 944 } 945 } 946 } 947 948 /* 949 * Thermal zone monitor thread. 950 */ 951 static void 952 acpi_tz_thread(void *arg) 953 { 954 device_t *devs; 955 int devcount, i; 956 int flags; 957 struct acpi_tz_softc **sc; 958 959 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 960 961 devs = NULL; 962 devcount = 0; 963 sc = NULL; 964 965 for (;;) { 966 /* If the number of devices has changed, re-evaluate. */ 967 if (devclass_get_count(acpi_tz_devclass) != devcount) { 968 if (devs != NULL) { 969 free(devs, M_TEMP); 970 free(sc, M_TEMP); 971 } 972 devclass_get_devices(acpi_tz_devclass, &devs, &devcount); 973 sc = malloc(sizeof(struct acpi_tz_softc *) * devcount, M_TEMP, 974 M_WAITOK | M_ZERO); 975 for (i = 0; i < devcount; i++) 976 sc[i] = device_get_softc(devs[i]); 977 } 978 979 /* Check for temperature events and act on them. */ 980 for (i = 0; i < devcount; i++) { 981 ACPI_LOCK(thermal); 982 flags = sc[i]->tz_flags; 983 sc[i]->tz_flags &= TZ_FLAG_NO_SCP; 984 ACPI_UNLOCK(thermal); 985 acpi_tz_timeout(sc[i], flags); 986 } 987 988 /* If more work to do, don't go to sleep yet. */ 989 ACPI_LOCK(thermal); 990 for (i = 0; i < devcount; i++) { 991 if (sc[i]->tz_flags & ~TZ_FLAG_NO_SCP) 992 break; 993 } 994 995 /* 996 * If we have no more work, sleep for a while, setting PDROP so that 997 * the mutex will not be reacquired. Otherwise, drop the mutex and 998 * loop to handle more events. 999 */ 1000 if (i == devcount) 1001 msleep(&acpi_tz_proc, &thermal_mutex, PZERO | PDROP, "tzpoll", 1002 hz * acpi_tz_polling_rate); 1003 else 1004 ACPI_UNLOCK(thermal); 1005 } 1006 } 1007 1008 static int 1009 acpi_tz_cpufreq_restore(struct acpi_tz_softc *sc) 1010 { 1011 device_t dev; 1012 int error; 1013 1014 if (!sc->tz_cooling_updated) 1015 return (0); 1016 if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL) 1017 return (ENXIO); 1018 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 1019 "temperature %d.%dC: resuming previous clock speed (%d MHz)\n", 1020 TZ_KELVTOC(sc->tz_temperature), sc->tz_cooling_saved_freq); 1021 error = CPUFREQ_SET(dev, NULL, CPUFREQ_PRIO_KERN); 1022 if (error == 0) 1023 sc->tz_cooling_updated = FALSE; 1024 return (error); 1025 } 1026 1027 static int 1028 acpi_tz_cpufreq_update(struct acpi_tz_softc *sc, int req) 1029 { 1030 device_t dev; 1031 struct cf_level *levels; 1032 int num_levels, error, freq, desired_freq, perf, i; 1033 1034 levels = malloc(CPUFREQ_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT); 1035 if (levels == NULL) 1036 return (ENOMEM); 1037 1038 /* 1039 * Find the main device, cpufreq0. We don't yet support independent 1040 * CPU frequency control on SMP. 1041 */ 1042 if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL) { 1043 error = ENXIO; 1044 goto out; 1045 } 1046 1047 /* Get the current frequency. */ 1048 error = CPUFREQ_GET(dev, &levels[0]); 1049 if (error) 1050 goto out; 1051 freq = levels[0].total_set.freq; 1052 1053 /* Get the current available frequency levels. */ 1054 num_levels = CPUFREQ_MAX_LEVELS; 1055 error = CPUFREQ_LEVELS(dev, levels, &num_levels); 1056 if (error) { 1057 if (error == E2BIG) 1058 printf("cpufreq: need to increase CPUFREQ_MAX_LEVELS\n"); 1059 goto out; 1060 } 1061 1062 /* Calculate the desired frequency as a percent of the max frequency. */ 1063 perf = 100 * freq / levels[0].total_set.freq - req; 1064 if (perf < 0) 1065 perf = 0; 1066 else if (perf > 100) 1067 perf = 100; 1068 desired_freq = levels[0].total_set.freq * perf / 100; 1069 1070 if (desired_freq < freq) { 1071 /* Find the closest available frequency, rounding down. */ 1072 for (i = 0; i < num_levels; i++) 1073 if (levels[i].total_set.freq <= desired_freq) 1074 break; 1075 1076 /* If we didn't find a relevant setting, use the lowest. */ 1077 if (i == num_levels) 1078 i--; 1079 } else { 1080 /* If we didn't decrease frequency yet, don't increase it. */ 1081 if (!sc->tz_cooling_updated) { 1082 sc->tz_cooling_active = FALSE; 1083 goto out; 1084 } 1085 1086 /* Use saved cpu frequency as maximum value. */ 1087 if (desired_freq > sc->tz_cooling_saved_freq) 1088 desired_freq = sc->tz_cooling_saved_freq; 1089 1090 /* Find the closest available frequency, rounding up. */ 1091 for (i = num_levels - 1; i >= 0; i--) 1092 if (levels[i].total_set.freq >= desired_freq) 1093 break; 1094 1095 /* If we didn't find a relevant setting, use the highest. */ 1096 if (i == -1) 1097 i++; 1098 1099 /* If we're going to the highest frequency, restore the old setting. */ 1100 if (i == 0 || desired_freq == sc->tz_cooling_saved_freq) { 1101 error = acpi_tz_cpufreq_restore(sc); 1102 if (error == 0) 1103 sc->tz_cooling_active = FALSE; 1104 goto out; 1105 } 1106 } 1107 1108 /* If we are going to a new frequency, activate it. */ 1109 if (levels[i].total_set.freq != freq) { 1110 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev), 1111 "temperature %d.%dC: %screasing clock speed " 1112 "from %d MHz to %d MHz\n", 1113 TZ_KELVTOC(sc->tz_temperature), 1114 (freq > levels[i].total_set.freq) ? "de" : "in", 1115 freq, levels[i].total_set.freq); 1116 error = CPUFREQ_SET(dev, &levels[i], CPUFREQ_PRIO_KERN); 1117 if (error == 0 && !sc->tz_cooling_updated) { 1118 sc->tz_cooling_saved_freq = freq; 1119 sc->tz_cooling_updated = TRUE; 1120 } 1121 } 1122 1123 out: 1124 if (levels) 1125 free(levels, M_TEMP); 1126 return (error); 1127 } 1128 1129 /* 1130 * Passive cooling thread; monitors current temperature according to the 1131 * cooling interval and calculates whether to scale back CPU frequency. 1132 */ 1133 static void 1134 acpi_tz_cooling_thread(void *arg) 1135 { 1136 struct acpi_tz_softc *sc; 1137 int error, perf, curr_temp, prev_temp; 1138 1139 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 1140 1141 sc = (struct acpi_tz_softc *)arg; 1142 1143 prev_temp = sc->tz_temperature; 1144 while (sc->tz_cooling_enabled) { 1145 if (sc->tz_cooling_active) 1146 (void)acpi_tz_get_temperature(sc); 1147 curr_temp = sc->tz_temperature; 1148 if (curr_temp >= sc->tz_zone.psv) 1149 sc->tz_cooling_active = TRUE; 1150 if (sc->tz_cooling_active) { 1151 perf = sc->tz_zone.tc1 * (curr_temp - prev_temp) + 1152 sc->tz_zone.tc2 * (curr_temp - sc->tz_zone.psv); 1153 perf /= 10; 1154 1155 if (perf != 0) { 1156 error = acpi_tz_cpufreq_update(sc, perf); 1157 1158 /* 1159 * If error and not simply a higher priority setting was 1160 * active, disable cooling. 1161 */ 1162 if (error != 0 && error != EPERM) { 1163 device_printf(sc->tz_dev, 1164 "failed to set new freq, disabling passive cooling\n"); 1165 sc->tz_cooling_enabled = FALSE; 1166 } 1167 } 1168 } 1169 prev_temp = curr_temp; 1170 tsleep(&sc->tz_cooling_proc, PZERO, "cooling", 1171 hz * sc->tz_zone.tsp / 10); 1172 } 1173 if (sc->tz_cooling_active) { 1174 acpi_tz_cpufreq_restore(sc); 1175 sc->tz_cooling_active = FALSE; 1176 } 1177 sc->tz_cooling_proc = NULL; 1178 ACPI_LOCK(thermal); 1179 sc->tz_cooling_proc_running = FALSE; 1180 ACPI_UNLOCK(thermal); 1181 kproc_exit(0); 1182 } 1183 1184 /* 1185 * TODO: We ignore _PSL (list of cooling devices) since cpufreq enumerates 1186 * all CPUs for us. However, it's possible in the future _PSL will 1187 * reference non-CPU devices so we may want to support it then. 1188 */ 1189 static int 1190 acpi_tz_cooling_is_available(struct acpi_tz_softc *sc) 1191 { 1192 return (sc->tz_zone.tc1 != -1 && sc->tz_zone.tc2 != -1 && 1193 sc->tz_zone.tsp != -1 && sc->tz_zone.tsp != 0 && 1194 sc->tz_zone.psv != -1); 1195 } 1196 1197 static int 1198 acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc) 1199 { 1200 int error; 1201 1202 ACPI_LOCK(thermal); 1203 if (sc->tz_cooling_proc_running) { 1204 ACPI_UNLOCK(thermal); 1205 return (0); 1206 } 1207 sc->tz_cooling_proc_running = TRUE; 1208 ACPI_UNLOCK(thermal); 1209 error = 0; 1210 if (sc->tz_cooling_proc == NULL) { 1211 error = kproc_create(acpi_tz_cooling_thread, sc, 1212 &sc->tz_cooling_proc, RFHIGHPID, 0, "acpi_cooling%d", 1213 device_get_unit(sc->tz_dev)); 1214 if (error != 0) { 1215 device_printf(sc->tz_dev, "could not create thread - %d", error); 1216 ACPI_LOCK(thermal); 1217 sc->tz_cooling_proc_running = FALSE; 1218 ACPI_UNLOCK(thermal); 1219 } 1220 } 1221 return (error); 1222 } 1223