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: releng/11.1/sys/dev/acpica/acpi_thermal.c 301562 2016-06-07 19:08:13Z cem $");
   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/proc.h>
   40 #include <sys/reboot.h>
   41 #include <sys/sysctl.h>
   42 #include <sys/unistd.h>
   43 #include <sys/power.h>
   44 
   45 #include "cpufreq_if.h"
   46 
   47 #include <contrib/dev/acpica/include/acpi.h>
   48 #include <contrib/dev/acpica/include/accommon.h>
   49 
   50 #include <dev/acpica/acpivar.h>
   51 
   52 /* Hooks for the ACPI CA debugging infrastructure */
   53 #define _COMPONENT      ACPI_THERMAL
   54 ACPI_MODULE_NAME("THERMAL")
   55 
   56 #define TZ_ZEROC        2731
   57 #define TZ_KELVTOC(x)   (((x) - TZ_ZEROC) / 10), abs(((x) - TZ_ZEROC) % 10)
   58 
   59 #define TZ_NOTIFY_TEMPERATURE   0x80 /* Temperature changed. */
   60 #define TZ_NOTIFY_LEVELS        0x81 /* Cooling levels changed. */
   61 #define TZ_NOTIFY_DEVICES       0x82 /* Device lists changed. */
   62 #define TZ_NOTIFY_CRITICAL      0xcc /* Fake notify that _CRT/_HOT reached. */
   63 
   64 /* Check for temperature changes every 10 seconds by default */
   65 #define TZ_POLLRATE     10
   66 
   67 /* Make sure the reported temperature is valid for this number of polls. */
   68 #define TZ_VALIDCHECKS  3
   69 
   70 /* Notify the user we will be shutting down in one more poll cycle. */
   71 #define TZ_NOTIFYCOUNT  (TZ_VALIDCHECKS - 1)
   72 
   73 /* ACPI spec defines this */
   74 #define TZ_NUMLEVELS    10
   75 struct acpi_tz_zone {
   76     int         ac[TZ_NUMLEVELS];
   77     ACPI_BUFFER al[TZ_NUMLEVELS];
   78     int         crt;
   79     int         hot;
   80     ACPI_BUFFER psl;
   81     int         psv;
   82     int         tc1;
   83     int         tc2;
   84     int         tsp;
   85     int         tzp;
   86 };
   87 
   88 struct acpi_tz_softc {
   89     device_t                    tz_dev;
   90     ACPI_HANDLE                 tz_handle;      /*Thermal zone handle*/
   91     int                         tz_temperature; /*Current temperature*/
   92     int                         tz_active;      /*Current active cooling*/
   93 #define TZ_ACTIVE_NONE          -1
   94 #define TZ_ACTIVE_UNKNOWN       -2
   95     int                         tz_requested;   /*Minimum active cooling*/
   96     int                         tz_thflags;     /*Current temp-related flags*/
   97 #define TZ_THFLAG_NONE          0
   98 #define TZ_THFLAG_PSV           (1<<0)
   99 #define TZ_THFLAG_HOT           (1<<2)
  100 #define TZ_THFLAG_CRT           (1<<3)
  101     int                         tz_flags;
  102 #define TZ_FLAG_NO_SCP          (1<<0)          /*No _SCP method*/
  103 #define TZ_FLAG_GETPROFILE      (1<<1)          /*Get power_profile in timeout*/
  104 #define TZ_FLAG_GETSETTINGS     (1<<2)          /*Get devs/setpoints*/
  105     struct timespec             tz_cooling_started;
  106                                         /*Current cooling starting time*/
  107 
  108     struct sysctl_ctx_list      tz_sysctl_ctx;
  109     struct sysctl_oid           *tz_sysctl_tree;
  110     eventhandler_tag            tz_event;
  111 
  112     struct acpi_tz_zone         tz_zone;        /*Thermal zone parameters*/
  113     int                         tz_validchecks;
  114     int                         tz_insane_tmp_notified;
  115 
  116     /* passive cooling */
  117     struct proc                 *tz_cooling_proc;
  118     int                         tz_cooling_proc_running;
  119     int                         tz_cooling_enabled;
  120     int                         tz_cooling_active;
  121     int                         tz_cooling_updated;
  122     int                         tz_cooling_saved_freq;
  123 };
  124 
  125 #define TZ_ACTIVE_LEVEL(act)    ((act) >= 0 ? (act) : TZ_NUMLEVELS)
  126 
  127 #define CPUFREQ_MAX_LEVELS      64 /* XXX cpufreq should export this */
  128 
  129 static int      acpi_tz_probe(device_t dev);
  130 static int      acpi_tz_attach(device_t dev);
  131 static int      acpi_tz_establish(struct acpi_tz_softc *sc);
  132 static void     acpi_tz_monitor(void *Context);
  133 static void     acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg);
  134 static void     acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg);
  135 static void     acpi_tz_getparam(struct acpi_tz_softc *sc, char *node,
  136                                  int *data);
  137 static void     acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what);
  138 static int      acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS);
  139 static int      acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS);
  140 static int      acpi_tz_temp_sysctl(SYSCTL_HANDLER_ARGS);
  141 static int      acpi_tz_passive_sysctl(SYSCTL_HANDLER_ARGS);
  142 static void     acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify,
  143                                        void *context);
  144 static void     acpi_tz_signal(struct acpi_tz_softc *sc, int flags);
  145 static void     acpi_tz_timeout(struct acpi_tz_softc *sc, int flags);
  146 static void     acpi_tz_power_profile(void *arg);
  147 static void     acpi_tz_thread(void *arg);
  148 static int      acpi_tz_cooling_is_available(struct acpi_tz_softc *sc);
  149 static int      acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc);
  150 
  151 static device_method_t acpi_tz_methods[] = {
  152     /* Device interface */
  153     DEVMETHOD(device_probe,     acpi_tz_probe),
  154     DEVMETHOD(device_attach,    acpi_tz_attach),
  155 
  156     DEVMETHOD_END
  157 };
  158 
  159 static driver_t acpi_tz_driver = {
  160     "acpi_tz",
  161     acpi_tz_methods,
  162     sizeof(struct acpi_tz_softc),
  163 };
  164 
  165 static char *acpi_tz_tmp_name = "_TMP";
  166 
  167 static devclass_t acpi_tz_devclass;
  168 DRIVER_MODULE(acpi_tz, acpi, acpi_tz_driver, acpi_tz_devclass, 0, 0);
  169 MODULE_DEPEND(acpi_tz, acpi, 1, 1, 1);
  170 
  171 static struct sysctl_ctx_list   acpi_tz_sysctl_ctx;
  172 static struct sysctl_oid        *acpi_tz_sysctl_tree;
  173 
  174 /* Minimum cooling run time */
  175 static int                      acpi_tz_min_runtime;
  176 static int                      acpi_tz_polling_rate = TZ_POLLRATE;
  177 static int                      acpi_tz_override;
  178 
  179 /* Timezone polling thread */
  180 static struct proc              *acpi_tz_proc;
  181 ACPI_LOCK_DECL(thermal, "ACPI thermal zone");
  182 
  183 static int                      acpi_tz_cooling_unit = -1;
  184 
  185 static int
  186 acpi_tz_probe(device_t dev)
  187 {
  188     int         result;
  189 
  190     if (acpi_get_type(dev) == ACPI_TYPE_THERMAL && !acpi_disabled("thermal")) {
  191         device_set_desc(dev, "Thermal Zone");
  192         result = -10;
  193     } else
  194         result = ENXIO;
  195     return (result);
  196 }
  197 
  198 static int
  199 acpi_tz_attach(device_t dev)
  200 {
  201     struct acpi_tz_softc        *sc;
  202     struct acpi_softc           *acpi_sc;
  203     int                         error;
  204     char                        oidname[8];
  205 
  206     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  207 
  208     sc = device_get_softc(dev);
  209     sc->tz_dev = dev;
  210     sc->tz_handle = acpi_get_handle(dev);
  211     sc->tz_requested = TZ_ACTIVE_NONE;
  212     sc->tz_active = TZ_ACTIVE_UNKNOWN;
  213     sc->tz_thflags = TZ_THFLAG_NONE;
  214     sc->tz_cooling_proc = NULL;
  215     sc->tz_cooling_proc_running = FALSE;
  216     sc->tz_cooling_active = FALSE;
  217     sc->tz_cooling_updated = FALSE;
  218     sc->tz_cooling_enabled = FALSE;
  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 interval in seconds");
  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_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
  265                     OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD,
  266                     &sc->tz_temperature, 0, sysctl_handle_int,
  267                     "IK", "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_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
  294                     OID_AUTO, "_ACx", CTLTYPE_INT | CTLFLAG_RD,
  295                     &sc->tz_zone.ac, sizeof(sc->tz_zone.ac),
  296                     sysctl_handle_opaque, "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      * Register our power profile event handler.
  315      */
  316     sc->tz_event = EVENTHANDLER_REGISTER(power_profile_change,
  317         acpi_tz_power_profile, sc, 0);
  318 
  319     /*
  320      * Flag the event handler for a manual invocation by our timeout.
  321      * We defer it like this so that the rest of the subsystem has time
  322      * to come up.  Don't bother evaluating/printing the temperature at
  323      * this point; on many systems it'll be bogus until the EC is running.
  324      */
  325     sc->tz_flags |= TZ_FLAG_GETPROFILE;
  326 
  327     return_VALUE (0);
  328 }
  329 
  330 static void
  331 acpi_tz_startup(void *arg __unused)
  332 {
  333     struct acpi_tz_softc *sc;
  334     device_t *devs;
  335     int devcount, error, i;
  336 
  337     devclass_get_devices(acpi_tz_devclass, &devs, &devcount);
  338     if (devcount == 0) {
  339         free(devs, M_TEMP);
  340         return;
  341     }
  342 
  343     /*
  344      * Create thread to service all of the thermal zones.
  345      */
  346     error = kproc_create(acpi_tz_thread, NULL, &acpi_tz_proc, RFHIGHPID, 0,
  347         "acpi_thermal");
  348     if (error != 0)
  349         printf("acpi_tz: could not create thread - %d", error);
  350 
  351     /*
  352      * Create a thread to handle passive cooling for 1st zone which
  353      * has _PSV, _TSP, _TC1 and _TC2.  Users can enable it for other
  354      * zones manually for now.
  355      *
  356      * XXX We enable only one zone to avoid multiple zones conflict
  357      * with each other since cpufreq currently sets all CPUs to the
  358      * given frequency whereas it's possible for different thermal
  359      * zones to specify independent settings for multiple CPUs.
  360      */
  361     for (i = 0; i < devcount; i++) {
  362         sc = device_get_softc(devs[i]);
  363         if (acpi_tz_cooling_is_available(sc)) {
  364             sc->tz_cooling_enabled = TRUE;
  365             error = acpi_tz_cooling_thread_start(sc);
  366             if (error != 0) {
  367                 sc->tz_cooling_enabled = FALSE;
  368                 break;
  369             }
  370             acpi_tz_cooling_unit = device_get_unit(devs[i]);
  371             break;
  372         }
  373     }
  374     free(devs, M_TEMP);
  375 }
  376 SYSINIT(acpi_tz, SI_SUB_KICK_SCHEDULER, SI_ORDER_ANY, acpi_tz_startup, NULL);
  377 
  378 /*
  379  * Parse the current state of this thermal zone and set up to use it.
  380  *
  381  * Note that we may have previous state, which will have to be discarded.
  382  */
  383 static int
  384 acpi_tz_establish(struct acpi_tz_softc *sc)
  385 {
  386     ACPI_OBJECT *obj;
  387     int         i;
  388     char        nbuf[8];
  389 
  390     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  391 
  392     /* Erase any existing state. */
  393     for (i = 0; i < TZ_NUMLEVELS; i++)
  394         if (sc->tz_zone.al[i].Pointer != NULL)
  395             AcpiOsFree(sc->tz_zone.al[i].Pointer);
  396     if (sc->tz_zone.psl.Pointer != NULL)
  397         AcpiOsFree(sc->tz_zone.psl.Pointer);
  398 
  399     /*
  400      * XXX: We initialize only ACPI_BUFFER to avoid race condition
  401      * with passive cooling thread which refers psv, tc1, tc2 and tsp.
  402      */
  403     bzero(sc->tz_zone.ac, sizeof(sc->tz_zone.ac));
  404     bzero(sc->tz_zone.al, sizeof(sc->tz_zone.al));
  405     bzero(&sc->tz_zone.psl, sizeof(sc->tz_zone.psl));
  406 
  407     /* Evaluate thermal zone parameters. */
  408     for (i = 0; i < TZ_NUMLEVELS; i++) {
  409         sprintf(nbuf, "_AC%d", i);
  410         acpi_tz_getparam(sc, nbuf, &sc->tz_zone.ac[i]);
  411         sprintf(nbuf, "_AL%d", i);
  412         sc->tz_zone.al[i].Length = ACPI_ALLOCATE_BUFFER;
  413         sc->tz_zone.al[i].Pointer = NULL;
  414         AcpiEvaluateObject(sc->tz_handle, nbuf, NULL, &sc->tz_zone.al[i]);
  415         obj = (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer;
  416         if (obj != NULL) {
  417             /* Should be a package containing a list of power objects */
  418             if (obj->Type != ACPI_TYPE_PACKAGE) {
  419                 device_printf(sc->tz_dev, "%s has unknown type %d, rejecting\n",
  420                               nbuf, obj->Type);
  421                 return_VALUE (ENXIO);
  422             }
  423         }
  424     }
  425     acpi_tz_getparam(sc, "_CRT", &sc->tz_zone.crt);
  426     acpi_tz_getparam(sc, "_HOT", &sc->tz_zone.hot);
  427     sc->tz_zone.psl.Length = ACPI_ALLOCATE_BUFFER;
  428     sc->tz_zone.psl.Pointer = NULL;
  429     AcpiEvaluateObject(sc->tz_handle, "_PSL", NULL, &sc->tz_zone.psl);
  430     acpi_tz_getparam(sc, "_PSV", &sc->tz_zone.psv);
  431     acpi_tz_getparam(sc, "_TC1", &sc->tz_zone.tc1);
  432     acpi_tz_getparam(sc, "_TC2", &sc->tz_zone.tc2);
  433     acpi_tz_getparam(sc, "_TSP", &sc->tz_zone.tsp);
  434     acpi_tz_getparam(sc, "_TZP", &sc->tz_zone.tzp);
  435 
  436     /*
  437      * Sanity-check the values we've been given.
  438      *
  439      * XXX what do we do about systems that give us the same value for
  440      *     more than one of these setpoints?
  441      */
  442     acpi_tz_sanity(sc, &sc->tz_zone.crt, "_CRT");
  443     acpi_tz_sanity(sc, &sc->tz_zone.hot, "_HOT");
  444     acpi_tz_sanity(sc, &sc->tz_zone.psv, "_PSV");
  445     for (i = 0; i < TZ_NUMLEVELS; i++)
  446         acpi_tz_sanity(sc, &sc->tz_zone.ac[i], "_ACx");
  447 
  448     return_VALUE (0);
  449 }
  450 
  451 static char *aclevel_string[] = {
  452     "NONE", "_AC0", "_AC1", "_AC2", "_AC3", "_AC4",
  453     "_AC5", "_AC6", "_AC7", "_AC8", "_AC9"
  454 };
  455 
  456 static __inline const char *
  457 acpi_tz_aclevel_string(int active)
  458 {
  459     if (active < -1 || active >= TZ_NUMLEVELS)
  460         return (aclevel_string[0]);
  461 
  462     return (aclevel_string[active + 1]);
  463 }
  464 
  465 /*
  466  * Get the current temperature.
  467  */
  468 static int
  469 acpi_tz_get_temperature(struct acpi_tz_softc *sc)
  470 {
  471     int         temp;
  472     ACPI_STATUS status;
  473 
  474     ACPI_FUNCTION_NAME ("acpi_tz_get_temperature");
  475 
  476     /* Evaluate the thermal zone's _TMP method. */
  477     status = acpi_GetInteger(sc->tz_handle, acpi_tz_tmp_name, &temp);
  478     if (ACPI_FAILURE(status)) {
  479         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
  480             "error fetching current temperature -- %s\n",
  481              AcpiFormatException(status));
  482         return (FALSE);
  483     }
  484 
  485     /* Check it for validity. */
  486     acpi_tz_sanity(sc, &temp, acpi_tz_tmp_name);
  487     if (temp == -1)
  488         return (FALSE);
  489 
  490     ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "got %d.%dC\n", TZ_KELVTOC(temp)));
  491     sc->tz_temperature = temp;
  492     return (TRUE);
  493 }
  494 
  495 /*
  496  * Evaluate the condition of a thermal zone, take appropriate actions.
  497  */
  498 static void
  499 acpi_tz_monitor(void *Context)
  500 {
  501     struct acpi_tz_softc *sc;
  502     struct      timespec curtime;
  503     int         temp;
  504     int         i;
  505     int         newactive, newflags;
  506 
  507     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  508 
  509     sc = (struct acpi_tz_softc *)Context;
  510 
  511     /* Get the current temperature. */
  512     if (!acpi_tz_get_temperature(sc)) {
  513         /* XXX disable zone? go to max cooling? */
  514         return_VOID;
  515     }
  516     temp = sc->tz_temperature;
  517 
  518     /*
  519      * Work out what we ought to be doing right now.
  520      *
  521      * Note that the _ACx levels sort from hot to cold.
  522      */
  523     newactive = TZ_ACTIVE_NONE;
  524     for (i = TZ_NUMLEVELS - 1; i >= 0; i--) {
  525         if (sc->tz_zone.ac[i] != -1 && temp >= sc->tz_zone.ac[i])
  526             newactive = i;
  527     }
  528 
  529     /*
  530      * We are going to get _ACx level down (colder side), but give a guaranteed
  531      * minimum cooling run time if requested.
  532      */
  533     if (acpi_tz_min_runtime > 0 && sc->tz_active != TZ_ACTIVE_NONE &&
  534         sc->tz_active != TZ_ACTIVE_UNKNOWN &&
  535         (newactive == TZ_ACTIVE_NONE || newactive > sc->tz_active)) {
  536 
  537         getnanotime(&curtime);
  538         timespecsub(&curtime, &sc->tz_cooling_started);
  539         if (curtime.tv_sec < acpi_tz_min_runtime)
  540             newactive = sc->tz_active;
  541     }
  542 
  543     /* Handle user override of active mode */
  544     if (sc->tz_requested != TZ_ACTIVE_NONE && (newactive == TZ_ACTIVE_NONE
  545         || sc->tz_requested < newactive))
  546         newactive = sc->tz_requested;
  547 
  548     /* update temperature-related flags */
  549     newflags = TZ_THFLAG_NONE;
  550     if (sc->tz_zone.psv != -1 && temp >= sc->tz_zone.psv)
  551         newflags |= TZ_THFLAG_PSV;
  552     if (sc->tz_zone.hot != -1 && temp >= sc->tz_zone.hot)
  553         newflags |= TZ_THFLAG_HOT;
  554     if (sc->tz_zone.crt != -1 && temp >= sc->tz_zone.crt)
  555         newflags |= TZ_THFLAG_CRT;
  556 
  557     /* If the active cooling state has changed, we have to switch things. */
  558     if (sc->tz_active == TZ_ACTIVE_UNKNOWN) {
  559         /*
  560          * We don't know which cooling device is on or off,
  561          * so stop them all, because we now know which
  562          * should be on (if any).
  563          */
  564         for (i = 0; i < TZ_NUMLEVELS; i++) {
  565             if (sc->tz_zone.al[i].Pointer != NULL) {
  566                 acpi_ForeachPackageObject(
  567                     (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
  568                     acpi_tz_switch_cooler_off, sc);
  569             }
  570         }
  571         /* now we know that all devices are off */
  572         sc->tz_active = TZ_ACTIVE_NONE;
  573     }
  574 
  575     if (newactive != sc->tz_active) {
  576         /* Turn off unneeded cooling devices that are on, if any are */
  577         for (i = TZ_ACTIVE_LEVEL(sc->tz_active);
  578              i < TZ_ACTIVE_LEVEL(newactive); i++) {
  579             acpi_ForeachPackageObject(
  580                 (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
  581                 acpi_tz_switch_cooler_off, sc);
  582         }
  583         /* Turn on cooling devices that are required, if any are */
  584         for (i = TZ_ACTIVE_LEVEL(sc->tz_active) - 1;
  585              i >= TZ_ACTIVE_LEVEL(newactive); i--) {
  586             acpi_ForeachPackageObject(
  587                 (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
  588                 acpi_tz_switch_cooler_on, sc);
  589         }
  590 
  591         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
  592                     "switched from %s to %s: %d.%dC\n",
  593                     acpi_tz_aclevel_string(sc->tz_active),
  594                     acpi_tz_aclevel_string(newactive), TZ_KELVTOC(temp));
  595         sc->tz_active = newactive;
  596         getnanotime(&sc->tz_cooling_started);
  597     }
  598 
  599     /* XXX (de)activate any passive cooling that may be required. */
  600 
  601     /*
  602      * If the temperature is at _HOT or _CRT, increment our event count.
  603      * If it has occurred enough times, shutdown the system.  This is
  604      * needed because some systems will report an invalid high temperature
  605      * for one poll cycle.  It is suspected this is due to the embedded
  606      * controller timing out.  A typical value is 138C for one cycle on
  607      * a system that is otherwise 65C.
  608      *
  609      * If we're almost at that threshold, notify the user through devd(8).
  610      */
  611     if ((newflags & (TZ_THFLAG_HOT | TZ_THFLAG_CRT)) != 0) {
  612         sc->tz_validchecks++;
  613         if (sc->tz_validchecks == TZ_VALIDCHECKS) {
  614             device_printf(sc->tz_dev,
  615                 "WARNING - current temperature (%d.%dC) exceeds safe limits\n",
  616                 TZ_KELVTOC(sc->tz_temperature));
  617             shutdown_nice(RB_POWEROFF);
  618         } else if (sc->tz_validchecks == TZ_NOTIFYCOUNT)
  619             acpi_UserNotify("Thermal", sc->tz_handle, TZ_NOTIFY_CRITICAL);
  620     } else {
  621         sc->tz_validchecks = 0;
  622     }
  623     sc->tz_thflags = newflags;
  624 
  625     return_VOID;
  626 }
  627 
  628 /*
  629  * Given an object, verify that it's a reference to a device of some sort,
  630  * and try to switch it off.
  631  */
  632 static void
  633 acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg)
  634 {
  635     ACPI_HANDLE                 cooler;
  636 
  637     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  638 
  639     cooler = acpi_GetReference(NULL, obj);
  640     if (cooler == NULL) {
  641         ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n"));
  642         return_VOID;
  643     }
  644 
  645     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s off\n",
  646                      acpi_name(cooler)));
  647     acpi_pwr_switch_consumer(cooler, ACPI_STATE_D3);
  648 
  649     return_VOID;
  650 }
  651 
  652 /*
  653  * Given an object, verify that it's a reference to a device of some sort,
  654  * and try to switch it on.
  655  *
  656  * XXX replication of off/on function code is bad.
  657  */
  658 static void
  659 acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg)
  660 {
  661     struct acpi_tz_softc        *sc = (struct acpi_tz_softc *)arg;
  662     ACPI_HANDLE                 cooler;
  663     ACPI_STATUS                 status;
  664 
  665     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  666 
  667     cooler = acpi_GetReference(NULL, obj);
  668     if (cooler == NULL) {
  669         ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n"));
  670         return_VOID;
  671     }
  672 
  673     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s on\n",
  674                      acpi_name(cooler)));
  675     status = acpi_pwr_switch_consumer(cooler, ACPI_STATE_D0);
  676     if (ACPI_FAILURE(status)) {
  677         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
  678                     "failed to activate %s - %s\n", acpi_name(cooler),
  679                     AcpiFormatException(status));
  680     }
  681 
  682     return_VOID;
  683 }
  684 
  685 /*
  686  * Read/debug-print a parameter, default it to -1.
  687  */
  688 static void
  689 acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data)
  690 {
  691 
  692     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  693 
  694     if (ACPI_FAILURE(acpi_GetInteger(sc->tz_handle, node, data))) {
  695         *data = -1;
  696     } else {
  697         ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "%s.%s = %d\n",
  698                          acpi_name(sc->tz_handle), node, *data));
  699     }
  700 
  701     return_VOID;
  702 }
  703 
  704 /*
  705  * Sanity-check a temperature value.  Assume that setpoints
  706  * should be between 0C and 200C.
  707  */
  708 static void
  709 acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what)
  710 {
  711     if (*val != -1 && (*val < TZ_ZEROC || *val > TZ_ZEROC + 2000)) {
  712         /*
  713          * If the value we are checking is _TMP, warn the user only
  714          * once. This avoids spamming messages if, for instance, the
  715          * sensor is broken and always returns an invalid temperature.
  716          *
  717          * This is only done for _TMP; other values always emit a
  718          * warning.
  719          */
  720         if (what != acpi_tz_tmp_name || !sc->tz_insane_tmp_notified) {
  721             device_printf(sc->tz_dev, "%s value is absurd, ignored (%d.%dC)\n",
  722                           what, TZ_KELVTOC(*val));
  723 
  724             /* Don't warn the user again if the read value doesn't improve. */
  725             if (what == acpi_tz_tmp_name)
  726                 sc->tz_insane_tmp_notified = 1;
  727         }
  728         *val = -1;
  729         return;
  730     }
  731 
  732     /* This value is correct. Warn if it's incorrect again. */
  733     if (what == acpi_tz_tmp_name)
  734         sc->tz_insane_tmp_notified = 0;
  735 }
  736 
  737 /*
  738  * Respond to a sysctl on the active state node.
  739  */
  740 static int
  741 acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS)
  742 {
  743     struct acpi_tz_softc        *sc;
  744     int                         active;
  745     int                         error;
  746 
  747     sc = (struct acpi_tz_softc *)oidp->oid_arg1;
  748     active = sc->tz_active;
  749     error = sysctl_handle_int(oidp, &active, 0, req);
  750 
  751     /* Error or no new value */
  752     if (error != 0 || req->newptr == NULL)
  753         return (error);
  754     if (active < -1 || active >= TZ_NUMLEVELS)
  755         return (EINVAL);
  756 
  757     /* Set new preferred level and re-switch */
  758     sc->tz_requested = active;
  759     acpi_tz_signal(sc, 0);
  760     return (0);
  761 }
  762 
  763 static int
  764 acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS)
  765 {
  766     struct acpi_tz_softc *sc;
  767     int enabled, error;
  768 
  769     sc = (struct acpi_tz_softc *)oidp->oid_arg1;
  770     enabled = sc->tz_cooling_enabled;
  771     error = sysctl_handle_int(oidp, &enabled, 0, req);
  772 
  773     /* Error or no new value */
  774     if (error != 0 || req->newptr == NULL)
  775         return (error);
  776     if (enabled != TRUE && enabled != FALSE)
  777         return (EINVAL);
  778 
  779     if (enabled) {
  780         if (acpi_tz_cooling_is_available(sc))
  781             error = acpi_tz_cooling_thread_start(sc);
  782         else
  783             error = ENODEV;
  784         if (error)
  785             enabled = FALSE;
  786     }
  787     sc->tz_cooling_enabled = enabled;
  788     return (error);
  789 }
  790 
  791 static int
  792 acpi_tz_temp_sysctl(SYSCTL_HANDLER_ARGS)
  793 {
  794     struct acpi_tz_softc        *sc;
  795     int                         temp, *temp_ptr;
  796     int                         error;
  797 
  798     sc = oidp->oid_arg1;
  799     temp_ptr = (int *)(void *)(uintptr_t)((uintptr_t)sc + oidp->oid_arg2);
  800     temp = *temp_ptr;
  801     error = sysctl_handle_int(oidp, &temp, 0, req);
  802 
  803     /* Error or no new value */
  804     if (error != 0 || req->newptr == NULL)
  805         return (error);
  806 
  807     /* Only allow changing settings if override is set. */
  808     if (!acpi_tz_override)
  809         return (EPERM);
  810 
  811     /* Check user-supplied value for sanity. */
  812     acpi_tz_sanity(sc, &temp, "user-supplied temp");
  813     if (temp == -1)
  814         return (EINVAL);
  815 
  816     *temp_ptr = temp;
  817     return (0);
  818 }
  819 
  820 static int
  821 acpi_tz_passive_sysctl(SYSCTL_HANDLER_ARGS)
  822 {
  823     struct acpi_tz_softc        *sc;
  824     int                         val, *val_ptr;
  825     int                         error;
  826 
  827     sc = oidp->oid_arg1;
  828     val_ptr = (int *)(void *)(uintptr_t)((uintptr_t)sc + oidp->oid_arg2);
  829     val = *val_ptr;
  830     error = sysctl_handle_int(oidp, &val, 0, req);
  831 
  832     /* Error or no new value */
  833     if (error != 0 || req->newptr == NULL)
  834         return (error);
  835 
  836     /* Only allow changing settings if override is set. */
  837     if (!acpi_tz_override)
  838         return (EPERM);
  839 
  840     *val_ptr = val;
  841     return (0);
  842 }
  843 
  844 static void
  845 acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
  846 {
  847     struct acpi_tz_softc        *sc = (struct acpi_tz_softc *)context;
  848 
  849     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  850 
  851     switch (notify) {
  852     case TZ_NOTIFY_TEMPERATURE:
  853         /* Temperature change occurred */
  854         acpi_tz_signal(sc, 0);
  855         break;
  856     case TZ_NOTIFY_DEVICES:
  857     case TZ_NOTIFY_LEVELS:
  858         /* Zone devices/setpoints changed */
  859         acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS);
  860         break;
  861     default:
  862         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
  863                     "unknown Notify event 0x%x\n", notify);
  864         break;
  865     }
  866 
  867     acpi_UserNotify("Thermal", h, notify);
  868 
  869     return_VOID;
  870 }
  871 
  872 static void
  873 acpi_tz_signal(struct acpi_tz_softc *sc, int flags)
  874 {
  875     ACPI_LOCK(thermal);
  876     sc->tz_flags |= flags;
  877     ACPI_UNLOCK(thermal);
  878     wakeup(&acpi_tz_proc);
  879 }
  880 
  881 /*
  882  * Notifies can be generated asynchronously but have also been seen to be
  883  * triggered by other thermal methods.  One system generates a notify of
  884  * 0x81 when the fan is turned on or off.  Another generates it when _SCP
  885  * is called.  To handle these situations, we check the zone via
  886  * acpi_tz_monitor() before evaluating changes to setpoints or the cooling
  887  * policy.
  888  */
  889 static void
  890 acpi_tz_timeout(struct acpi_tz_softc *sc, int flags)
  891 {
  892 
  893     /* Check the current temperature and take action based on it */
  894     acpi_tz_monitor(sc);
  895 
  896     /* If requested, get the power profile settings. */
  897     if (flags & TZ_FLAG_GETPROFILE)
  898         acpi_tz_power_profile(sc);
  899 
  900     /*
  901      * If requested, check for new devices/setpoints.  After finding them,
  902      * check if we need to switch fans based on the new values.
  903      */
  904     if (flags & TZ_FLAG_GETSETTINGS) {
  905         acpi_tz_establish(sc);
  906         acpi_tz_monitor(sc);
  907     }
  908 
  909     /* XXX passive cooling actions? */
  910 }
  911 
  912 /*
  913  * System power profile may have changed; fetch and notify the
  914  * thermal zone accordingly.
  915  *
  916  * Since this can be called from an arbitrary eventhandler, it needs
  917  * to get the ACPI lock itself.
  918  */
  919 static void
  920 acpi_tz_power_profile(void *arg)
  921 {
  922     ACPI_STATUS                 status;
  923     struct acpi_tz_softc        *sc = (struct acpi_tz_softc *)arg;
  924     int                         state;
  925 
  926     state = power_profile_get_state();
  927     if (state != POWER_PROFILE_PERFORMANCE && state != POWER_PROFILE_ECONOMY)
  928         return;
  929 
  930     /* check that we haven't decided there's no _SCP method */
  931     if ((sc->tz_flags & TZ_FLAG_NO_SCP) == 0) {
  932 
  933         /* Call _SCP to set the new profile */
  934         status = acpi_SetInteger(sc->tz_handle, "_SCP",
  935             (state == POWER_PROFILE_PERFORMANCE) ? 0 : 1);
  936         if (ACPI_FAILURE(status)) {
  937             if (status != AE_NOT_FOUND)
  938                 ACPI_VPRINT(sc->tz_dev,
  939                             acpi_device_get_parent_softc(sc->tz_dev),
  940                             "can't evaluate %s._SCP - %s\n",
  941                             acpi_name(sc->tz_handle),
  942                             AcpiFormatException(status));
  943             sc->tz_flags |= TZ_FLAG_NO_SCP;
  944         } else {
  945             /* We have to re-evaluate the entire zone now */
  946             acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS);
  947         }
  948     }
  949 }
  950 
  951 /*
  952  * Thermal zone monitor thread.
  953  */
  954 static void
  955 acpi_tz_thread(void *arg)
  956 {
  957     device_t    *devs;
  958     int         devcount, i;
  959     int         flags;
  960     struct acpi_tz_softc **sc;
  961 
  962     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  963 
  964     devs = NULL;
  965     devcount = 0;
  966     sc = NULL;
  967 
  968     for (;;) {
  969         /* If the number of devices has changed, re-evaluate. */
  970         if (devclass_get_count(acpi_tz_devclass) != devcount) {
  971             if (devs != NULL) {
  972                 free(devs, M_TEMP);
  973                 free(sc, M_TEMP);
  974             }
  975             devclass_get_devices(acpi_tz_devclass, &devs, &devcount);
  976             sc = malloc(sizeof(struct acpi_tz_softc *) * devcount, M_TEMP,
  977                         M_WAITOK | M_ZERO);
  978             for (i = 0; i < devcount; i++)
  979                 sc[i] = device_get_softc(devs[i]);
  980         }
  981 
  982         /* Check for temperature events and act on them. */
  983         for (i = 0; i < devcount; i++) {
  984             ACPI_LOCK(thermal);
  985             flags = sc[i]->tz_flags;
  986             sc[i]->tz_flags &= TZ_FLAG_NO_SCP;
  987             ACPI_UNLOCK(thermal);
  988             acpi_tz_timeout(sc[i], flags);
  989         }
  990 
  991         /* If more work to do, don't go to sleep yet. */
  992         ACPI_LOCK(thermal);
  993         for (i = 0; i < devcount; i++) {
  994             if (sc[i]->tz_flags & ~TZ_FLAG_NO_SCP)
  995                 break;
  996         }
  997 
  998         /*
  999          * If we have no more work, sleep for a while, setting PDROP so that
 1000          * the mutex will not be reacquired.  Otherwise, drop the mutex and
 1001          * loop to handle more events.
 1002          */
 1003         if (i == devcount)
 1004             msleep(&acpi_tz_proc, &thermal_mutex, PZERO | PDROP, "tzpoll",
 1005                 hz * acpi_tz_polling_rate);
 1006         else
 1007             ACPI_UNLOCK(thermal);
 1008     }
 1009 }
 1010 
 1011 static int
 1012 acpi_tz_cpufreq_restore(struct acpi_tz_softc *sc)
 1013 {
 1014     device_t dev;
 1015     int error;
 1016 
 1017     if (!sc->tz_cooling_updated)
 1018         return (0);
 1019     if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL)
 1020         return (ENXIO);
 1021     ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 1022         "temperature %d.%dC: resuming previous clock speed (%d MHz)\n",
 1023         TZ_KELVTOC(sc->tz_temperature), sc->tz_cooling_saved_freq);
 1024     error = CPUFREQ_SET(dev, NULL, CPUFREQ_PRIO_KERN);
 1025     if (error == 0)
 1026         sc->tz_cooling_updated = FALSE;
 1027     return (error);
 1028 }
 1029 
 1030 static int
 1031 acpi_tz_cpufreq_update(struct acpi_tz_softc *sc, int req)
 1032 {
 1033     device_t dev;
 1034     struct cf_level *levels;
 1035     int num_levels, error, freq, desired_freq, perf, i;
 1036 
 1037     levels = malloc(CPUFREQ_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT);
 1038     if (levels == NULL)
 1039         return (ENOMEM);
 1040 
 1041     /*
 1042      * Find the main device, cpufreq0.  We don't yet support independent
 1043      * CPU frequency control on SMP.
 1044      */
 1045     if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL) {
 1046         error = ENXIO;
 1047         goto out;
 1048     }
 1049 
 1050     /* Get the current frequency. */
 1051     error = CPUFREQ_GET(dev, &levels[0]);
 1052     if (error)
 1053         goto out;
 1054     freq = levels[0].total_set.freq;
 1055 
 1056     /* Get the current available frequency levels. */
 1057     num_levels = CPUFREQ_MAX_LEVELS;
 1058     error = CPUFREQ_LEVELS(dev, levels, &num_levels);
 1059     if (error) {
 1060         if (error == E2BIG)
 1061             printf("cpufreq: need to increase CPUFREQ_MAX_LEVELS\n");
 1062         goto out;
 1063     }
 1064 
 1065     /* Calculate the desired frequency as a percent of the max frequency. */
 1066     perf = 100 * freq / levels[0].total_set.freq - req;
 1067     if (perf < 0)
 1068         perf = 0;
 1069     else if (perf > 100)
 1070         perf = 100;
 1071     desired_freq = levels[0].total_set.freq * perf / 100;
 1072 
 1073     if (desired_freq < freq) {
 1074         /* Find the closest available frequency, rounding down. */
 1075         for (i = 0; i < num_levels; i++)
 1076             if (levels[i].total_set.freq <= desired_freq)
 1077                 break;
 1078 
 1079         /* If we didn't find a relevant setting, use the lowest. */
 1080         if (i == num_levels)
 1081             i--;
 1082     } else {
 1083         /* If we didn't decrease frequency yet, don't increase it. */
 1084         if (!sc->tz_cooling_updated) {
 1085             sc->tz_cooling_active = FALSE;
 1086             goto out;
 1087         }
 1088 
 1089         /* Use saved cpu frequency as maximum value. */
 1090         if (desired_freq > sc->tz_cooling_saved_freq)
 1091             desired_freq = sc->tz_cooling_saved_freq;
 1092 
 1093         /* Find the closest available frequency, rounding up. */
 1094         for (i = num_levels - 1; i >= 0; i--)
 1095             if (levels[i].total_set.freq >= desired_freq)
 1096                 break;
 1097 
 1098         /* If we didn't find a relevant setting, use the highest. */
 1099         if (i == -1)
 1100             i++;
 1101 
 1102         /* If we're going to the highest frequency, restore the old setting. */
 1103         if (i == 0 || desired_freq == sc->tz_cooling_saved_freq) {
 1104             error = acpi_tz_cpufreq_restore(sc);
 1105             if (error == 0)
 1106                 sc->tz_cooling_active = FALSE;
 1107             goto out;
 1108         }
 1109     }
 1110 
 1111     /* If we are going to a new frequency, activate it. */
 1112     if (levels[i].total_set.freq != freq) {
 1113         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 1114             "temperature %d.%dC: %screasing clock speed "
 1115             "from %d MHz to %d MHz\n",
 1116             TZ_KELVTOC(sc->tz_temperature),
 1117             (freq > levels[i].total_set.freq) ? "de" : "in",
 1118             freq, levels[i].total_set.freq);
 1119         error = CPUFREQ_SET(dev, &levels[i], CPUFREQ_PRIO_KERN);
 1120         if (error == 0 && !sc->tz_cooling_updated) {
 1121             sc->tz_cooling_saved_freq = freq;
 1122             sc->tz_cooling_updated = TRUE;
 1123         }
 1124     }
 1125 
 1126 out:
 1127     if (levels)
 1128         free(levels, M_TEMP);
 1129     return (error);
 1130 }
 1131 
 1132 /*
 1133  * Passive cooling thread; monitors current temperature according to the
 1134  * cooling interval and calculates whether to scale back CPU frequency.
 1135  */
 1136 static void
 1137 acpi_tz_cooling_thread(void *arg)
 1138 {
 1139     struct acpi_tz_softc *sc;
 1140     int error, perf, curr_temp, prev_temp;
 1141 
 1142     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1143 
 1144     sc = (struct acpi_tz_softc *)arg;
 1145 
 1146     prev_temp = sc->tz_temperature;
 1147     while (sc->tz_cooling_enabled) {
 1148         if (sc->tz_cooling_active)
 1149             (void)acpi_tz_get_temperature(sc);
 1150         curr_temp = sc->tz_temperature;
 1151         if (curr_temp >= sc->tz_zone.psv)
 1152             sc->tz_cooling_active = TRUE;
 1153         if (sc->tz_cooling_active) {
 1154             perf = sc->tz_zone.tc1 * (curr_temp - prev_temp) +
 1155                    sc->tz_zone.tc2 * (curr_temp - sc->tz_zone.psv);
 1156             perf /= 10;
 1157 
 1158             if (perf != 0) {
 1159                 error = acpi_tz_cpufreq_update(sc, perf);
 1160 
 1161                 /*
 1162                  * If error and not simply a higher priority setting was
 1163                  * active, disable cooling.
 1164                  */
 1165                 if (error != 0 && error != EPERM) {
 1166                     device_printf(sc->tz_dev,
 1167                         "failed to set new freq, disabling passive cooling\n");
 1168                     sc->tz_cooling_enabled = FALSE;
 1169                 }
 1170             }
 1171         }
 1172         prev_temp = curr_temp;
 1173         tsleep(&sc->tz_cooling_proc, PZERO, "cooling",
 1174             hz * sc->tz_zone.tsp / 10);
 1175     }
 1176     if (sc->tz_cooling_active) {
 1177         acpi_tz_cpufreq_restore(sc);
 1178         sc->tz_cooling_active = FALSE;
 1179     }
 1180     sc->tz_cooling_proc = NULL;
 1181     ACPI_LOCK(thermal);
 1182     sc->tz_cooling_proc_running = FALSE;
 1183     ACPI_UNLOCK(thermal);
 1184     kproc_exit(0);
 1185 }
 1186 
 1187 /*
 1188  * TODO: We ignore _PSL (list of cooling devices) since cpufreq enumerates
 1189  * all CPUs for us.  However, it's possible in the future _PSL will
 1190  * reference non-CPU devices so we may want to support it then.
 1191  */
 1192 static int
 1193 acpi_tz_cooling_is_available(struct acpi_tz_softc *sc)
 1194 {
 1195     return (sc->tz_zone.tc1 != -1 && sc->tz_zone.tc2 != -1 &&
 1196         sc->tz_zone.tsp != -1 && sc->tz_zone.tsp != 0 &&
 1197         sc->tz_zone.psv != -1);
 1198 }
 1199 
 1200 static int
 1201 acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc)
 1202 {
 1203     int error;
 1204 
 1205     ACPI_LOCK(thermal);
 1206     if (sc->tz_cooling_proc_running) {
 1207         ACPI_UNLOCK(thermal);
 1208         return (0);
 1209     }
 1210     sc->tz_cooling_proc_running = TRUE;
 1211     ACPI_UNLOCK(thermal);
 1212     error = 0;
 1213     if (sc->tz_cooling_proc == NULL) {
 1214         error = kproc_create(acpi_tz_cooling_thread, sc,
 1215             &sc->tz_cooling_proc, RFHIGHPID, 0, "acpi_cooling%d",
 1216             device_get_unit(sc->tz_dev));
 1217         if (error != 0) {
 1218             device_printf(sc->tz_dev, "could not create thread - %d", error);
 1219             ACPI_LOCK(thermal);
 1220             sc->tz_cooling_proc_running = FALSE;
 1221             ACPI_UNLOCK(thermal);
 1222         }
 1223     }
 1224     return (error);
 1225 }

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