The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_thermal.c

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

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