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/8.4/sys/dev/acpica/acpi_thermal.c 242564 2012-11-04 13:42:34Z avg $");
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/include/acpi.h>
49 #include <contrib/dev/acpica/include/accommon.h>
50
51 #include <dev/acpica/acpivar.h>
52
53 /* Hooks for the ACPI CA debugging infrastructure */
54 #define _COMPONENT ACPI_THERMAL
55 ACPI_MODULE_NAME("THERMAL")
56
57 #define TZ_ZEROC 2732
58 #define TZ_KELVTOC(x) (((x) - TZ_ZEROC) / 10), abs(((x) - TZ_ZEROC) % 10)
59
60 #define TZ_NOTIFY_TEMPERATURE 0x80 /* Temperature changed. */
61 #define TZ_NOTIFY_LEVELS 0x81 /* Cooling levels changed. */
62 #define TZ_NOTIFY_DEVICES 0x82 /* Device lists changed. */
63 #define TZ_NOTIFY_CRITICAL 0xcc /* Fake notify that _CRT/_HOT reached. */
64
65 /* Check for temperature changes every 10 seconds by default */
66 #define TZ_POLLRATE 10
67
68 /* Make sure the reported temperature is valid for this number of polls. */
69 #define TZ_VALIDCHECKS 3
70
71 /* Notify the user we will be shutting down in one more poll cycle. */
72 #define TZ_NOTIFYCOUNT (TZ_VALIDCHECKS - 1)
73
74 /* ACPI spec defines this */
75 #define TZ_NUMLEVELS 10
76 struct acpi_tz_zone {
77 int ac[TZ_NUMLEVELS];
78 ACPI_BUFFER al[TZ_NUMLEVELS];
79 int crt;
80 int hot;
81 ACPI_BUFFER psl;
82 int psv;
83 int tc1;
84 int tc2;
85 int tsp;
86 int tzp;
87 };
88
89 struct acpi_tz_softc {
90 device_t tz_dev;
91 ACPI_HANDLE tz_handle; /*Thermal zone handle*/
92 int tz_temperature; /*Current temperature*/
93 int tz_active; /*Current active cooling*/
94 #define TZ_ACTIVE_NONE -1
95 #define TZ_ACTIVE_UNKNOWN -2
96 int tz_requested; /*Minimum active cooling*/
97 int tz_thflags; /*Current temp-related flags*/
98 #define TZ_THFLAG_NONE 0
99 #define TZ_THFLAG_PSV (1<<0)
100 #define TZ_THFLAG_HOT (1<<2)
101 #define TZ_THFLAG_CRT (1<<3)
102 int tz_flags;
103 #define TZ_FLAG_NO_SCP (1<<0) /*No _SCP method*/
104 #define TZ_FLAG_GETPROFILE (1<<1) /*Get power_profile in timeout*/
105 #define TZ_FLAG_GETSETTINGS (1<<2) /*Get devs/setpoints*/
106 struct timespec tz_cooling_started;
107 /*Current cooling starting time*/
108
109 struct sysctl_ctx_list tz_sysctl_ctx;
110 struct sysctl_oid *tz_sysctl_tree;
111 eventhandler_tag tz_event;
112
113 struct acpi_tz_zone tz_zone; /*Thermal zone parameters*/
114 int tz_validchecks;
115
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 {0, 0}
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 devclass_t acpi_tz_devclass;
166 DRIVER_MODULE(acpi_tz, acpi, acpi_tz_driver, acpi_tz_devclass, 0, 0);
167 MODULE_DEPEND(acpi_tz, acpi, 1, 1, 1);
168
169 static struct sysctl_ctx_list acpi_tz_sysctl_ctx;
170 static struct sysctl_oid *acpi_tz_sysctl_tree;
171
172 /* Minimum cooling run time */
173 static int acpi_tz_min_runtime;
174 static int acpi_tz_polling_rate = TZ_POLLRATE;
175 static int acpi_tz_override;
176
177 /* Timezone polling thread */
178 static struct proc *acpi_tz_proc;
179 ACPI_LOCK_DECL(thermal, "ACPI thermal zone");
180
181 static int acpi_tz_cooling_unit = -1;
182
183 static int
184 acpi_tz_probe(device_t dev)
185 {
186 int result;
187
188 if (acpi_get_type(dev) == ACPI_TYPE_THERMAL && !acpi_disabled("thermal")) {
189 device_set_desc(dev, "Thermal Zone");
190 result = -10;
191 } else
192 result = ENXIO;
193 return (result);
194 }
195
196 static int
197 acpi_tz_attach(device_t dev)
198 {
199 struct acpi_tz_softc *sc;
200 struct acpi_softc *acpi_sc;
201 int error;
202 char oidname[8];
203
204 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
205
206 sc = device_get_softc(dev);
207 sc->tz_dev = dev;
208 sc->tz_handle = acpi_get_handle(dev);
209 sc->tz_requested = TZ_ACTIVE_NONE;
210 sc->tz_active = TZ_ACTIVE_UNKNOWN;
211 sc->tz_thflags = TZ_THFLAG_NONE;
212 sc->tz_cooling_proc = NULL;
213 sc->tz_cooling_proc_running = FALSE;
214 sc->tz_cooling_active = FALSE;
215 sc->tz_cooling_updated = FALSE;
216 sc->tz_cooling_enabled = FALSE;
217
218 /*
219 * Parse the current state of the thermal zone and build control
220 * structures. We don't need to worry about interference with the
221 * control thread since we haven't fully attached this device yet.
222 */
223 if ((error = acpi_tz_establish(sc)) != 0)
224 return (error);
225
226 /*
227 * Register for any Notify events sent to this zone.
228 */
229 AcpiInstallNotifyHandler(sc->tz_handle, ACPI_DEVICE_NOTIFY,
230 acpi_tz_notify_handler, sc);
231
232 /*
233 * Create our sysctl nodes.
234 *
235 * XXX we need a mechanism for adding nodes under ACPI.
236 */
237 if (device_get_unit(dev) == 0) {
238 acpi_sc = acpi_device_get_parent_softc(dev);
239 sysctl_ctx_init(&acpi_tz_sysctl_ctx);
240 acpi_tz_sysctl_tree = SYSCTL_ADD_NODE(&acpi_tz_sysctl_ctx,
241 SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree),
242 OID_AUTO, "thermal", CTLFLAG_RD, 0, "");
243 SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx,
244 SYSCTL_CHILDREN(acpi_tz_sysctl_tree),
245 OID_AUTO, "min_runtime", CTLFLAG_RW,
246 &acpi_tz_min_runtime, 0,
247 "minimum cooling run time in sec");
248 SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx,
249 SYSCTL_CHILDREN(acpi_tz_sysctl_tree),
250 OID_AUTO, "polling_rate", CTLFLAG_RW,
251 &acpi_tz_polling_rate, 0, "monitor polling interval in seconds");
252 SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx,
253 SYSCTL_CHILDREN(acpi_tz_sysctl_tree), OID_AUTO,
254 "user_override", CTLFLAG_RW, &acpi_tz_override, 0,
255 "allow override of thermal settings");
256 }
257 sysctl_ctx_init(&sc->tz_sysctl_ctx);
258 sprintf(oidname, "tz%d", device_get_unit(dev));
259 sc->tz_sysctl_tree = SYSCTL_ADD_NODE(&sc->tz_sysctl_ctx,
260 SYSCTL_CHILDREN(acpi_tz_sysctl_tree),
261 OID_AUTO, oidname, CTLFLAG_RD, 0, "");
262 SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
263 OID_AUTO, "temperature", CTLFLAG_RD, &sc->tz_temperature,
264 sizeof(sc->tz_temperature), "IK",
265 "current thermal zone temperature");
266 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
267 OID_AUTO, "active", CTLTYPE_INT | CTLFLAG_RW,
268 sc, 0, acpi_tz_active_sysctl, "I", "cooling is active");
269 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
270 OID_AUTO, "passive_cooling", CTLTYPE_INT | CTLFLAG_RW,
271 sc, 0, acpi_tz_cooling_sysctl, "I",
272 "enable passive (speed reduction) cooling");
273
274 SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
275 OID_AUTO, "thermal_flags", CTLFLAG_RD,
276 &sc->tz_thflags, 0, "thermal zone flags");
277 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
278 OID_AUTO, "_PSV", CTLTYPE_INT | CTLFLAG_RW,
279 sc, offsetof(struct acpi_tz_softc, tz_zone.psv),
280 acpi_tz_temp_sysctl, "IK", "passive cooling temp setpoint");
281 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
282 OID_AUTO, "_HOT", CTLTYPE_INT | CTLFLAG_RW,
283 sc, offsetof(struct acpi_tz_softc, tz_zone.hot),
284 acpi_tz_temp_sysctl, "IK",
285 "too hot temp setpoint (suspend now)");
286 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
287 OID_AUTO, "_CRT", CTLTYPE_INT | CTLFLAG_RW,
288 sc, offsetof(struct acpi_tz_softc, tz_zone.crt),
289 acpi_tz_temp_sysctl, "IK",
290 "critical temp setpoint (shutdown now)");
291 SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
292 OID_AUTO, "_ACx", CTLFLAG_RD, &sc->tz_zone.ac,
293 sizeof(sc->tz_zone.ac), "IK", "");
294 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
295 OID_AUTO, "_TC1", CTLTYPE_INT | CTLFLAG_RW,
296 sc, offsetof(struct acpi_tz_softc, tz_zone.tc1),
297 acpi_tz_passive_sysctl, "I",
298 "thermal constant 1 for passive cooling");
299 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
300 OID_AUTO, "_TC2", CTLTYPE_INT | CTLFLAG_RW,
301 sc, offsetof(struct acpi_tz_softc, tz_zone.tc2),
302 acpi_tz_passive_sysctl, "I",
303 "thermal constant 2 for passive cooling");
304 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
305 OID_AUTO, "_TSP", CTLTYPE_INT | CTLFLAG_RW,
306 sc, offsetof(struct acpi_tz_softc, tz_zone.tsp),
307 acpi_tz_passive_sysctl, "I",
308 "thermal sampling period for passive cooling");
309
310 /*
311 * Create thread to service all of the thermal zones. Register
312 * our power profile event handler.
313 */
314 sc->tz_event = EVENTHANDLER_REGISTER(power_profile_change,
315 acpi_tz_power_profile, sc, 0);
316 if (acpi_tz_proc == NULL) {
317 error = kproc_create(acpi_tz_thread, NULL, &acpi_tz_proc,
318 RFHIGHPID, 0, "acpi_thermal");
319 if (error != 0) {
320 device_printf(sc->tz_dev, "could not create thread - %d", error);
321 goto out;
322 }
323 }
324
325 /*
326 * Create a thread to handle passive cooling for 1st zone which
327 * has _PSV, _TSP, _TC1 and _TC2. Users can enable it for other
328 * zones manually for now.
329 *
330 * XXX We enable only one zone to avoid multiple zones conflict
331 * with each other since cpufreq currently sets all CPUs to the
332 * given frequency whereas it's possible for different thermal
333 * zones to specify independent settings for multiple CPUs.
334 */
335 if (acpi_tz_cooling_unit < 0 && acpi_tz_cooling_is_available(sc))
336 sc->tz_cooling_enabled = TRUE;
337 if (sc->tz_cooling_enabled) {
338 error = acpi_tz_cooling_thread_start(sc);
339 if (error != 0) {
340 sc->tz_cooling_enabled = FALSE;
341 goto out;
342 }
343 acpi_tz_cooling_unit = device_get_unit(dev);
344 }
345
346 /*
347 * Flag the event handler for a manual invocation by our timeout.
348 * We defer it like this so that the rest of the subsystem has time
349 * to come up. Don't bother evaluating/printing the temperature at
350 * this point; on many systems it'll be bogus until the EC is running.
351 */
352 sc->tz_flags |= TZ_FLAG_GETPROFILE;
353
354 out:
355 if (error != 0) {
356 EVENTHANDLER_DEREGISTER(power_profile_change, sc->tz_event);
357 AcpiRemoveNotifyHandler(sc->tz_handle, ACPI_DEVICE_NOTIFY,
358 acpi_tz_notify_handler);
359 sysctl_ctx_free(&sc->tz_sysctl_ctx);
360 }
361 return_VALUE (error);
362 }
363
364 /*
365 * Parse the current state of this thermal zone and set up to use it.
366 *
367 * Note that we may have previous state, which will have to be discarded.
368 */
369 static int
370 acpi_tz_establish(struct acpi_tz_softc *sc)
371 {
372 ACPI_OBJECT *obj;
373 int i;
374 char nbuf[8];
375
376 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
377
378 /* Erase any existing state. */
379 for (i = 0; i < TZ_NUMLEVELS; i++)
380 if (sc->tz_zone.al[i].Pointer != NULL)
381 AcpiOsFree(sc->tz_zone.al[i].Pointer);
382 if (sc->tz_zone.psl.Pointer != NULL)
383 AcpiOsFree(sc->tz_zone.psl.Pointer);
384
385 /*
386 * XXX: We initialize only ACPI_BUFFER to avoid race condition
387 * with passive cooling thread which refers psv, tc1, tc2 and tsp.
388 */
389 bzero(sc->tz_zone.ac, sizeof(sc->tz_zone.ac));
390 bzero(sc->tz_zone.al, sizeof(sc->tz_zone.al));
391 bzero(&sc->tz_zone.psl, sizeof(sc->tz_zone.psl));
392
393 /* Evaluate thermal zone parameters. */
394 for (i = 0; i < TZ_NUMLEVELS; i++) {
395 sprintf(nbuf, "_AC%d", i);
396 acpi_tz_getparam(sc, nbuf, &sc->tz_zone.ac[i]);
397 sprintf(nbuf, "_AL%d", i);
398 sc->tz_zone.al[i].Length = ACPI_ALLOCATE_BUFFER;
399 sc->tz_zone.al[i].Pointer = NULL;
400 AcpiEvaluateObject(sc->tz_handle, nbuf, NULL, &sc->tz_zone.al[i]);
401 obj = (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer;
402 if (obj != NULL) {
403 /* Should be a package containing a list of power objects */
404 if (obj->Type != ACPI_TYPE_PACKAGE) {
405 device_printf(sc->tz_dev, "%s has unknown type %d, rejecting\n",
406 nbuf, obj->Type);
407 return_VALUE (ENXIO);
408 }
409 }
410 }
411 acpi_tz_getparam(sc, "_CRT", &sc->tz_zone.crt);
412 acpi_tz_getparam(sc, "_HOT", &sc->tz_zone.hot);
413 sc->tz_zone.psl.Length = ACPI_ALLOCATE_BUFFER;
414 sc->tz_zone.psl.Pointer = NULL;
415 AcpiEvaluateObject(sc->tz_handle, "_PSL", NULL, &sc->tz_zone.psl);
416 acpi_tz_getparam(sc, "_PSV", &sc->tz_zone.psv);
417 acpi_tz_getparam(sc, "_TC1", &sc->tz_zone.tc1);
418 acpi_tz_getparam(sc, "_TC2", &sc->tz_zone.tc2);
419 acpi_tz_getparam(sc, "_TSP", &sc->tz_zone.tsp);
420 acpi_tz_getparam(sc, "_TZP", &sc->tz_zone.tzp);
421
422 /*
423 * Sanity-check the values we've been given.
424 *
425 * XXX what do we do about systems that give us the same value for
426 * more than one of these setpoints?
427 */
428 acpi_tz_sanity(sc, &sc->tz_zone.crt, "_CRT");
429 acpi_tz_sanity(sc, &sc->tz_zone.hot, "_HOT");
430 acpi_tz_sanity(sc, &sc->tz_zone.psv, "_PSV");
431 for (i = 0; i < TZ_NUMLEVELS; i++)
432 acpi_tz_sanity(sc, &sc->tz_zone.ac[i], "_ACx");
433
434 return_VALUE (0);
435 }
436
437 static char *aclevel_string[] = {
438 "NONE", "_AC0", "_AC1", "_AC2", "_AC3", "_AC4",
439 "_AC5", "_AC6", "_AC7", "_AC8", "_AC9"
440 };
441
442 static __inline const char *
443 acpi_tz_aclevel_string(int active)
444 {
445 if (active < -1 || active >= TZ_NUMLEVELS)
446 return (aclevel_string[0]);
447
448 return (aclevel_string[active + 1]);
449 }
450
451 /*
452 * Get the current temperature.
453 */
454 static int
455 acpi_tz_get_temperature(struct acpi_tz_softc *sc)
456 {
457 int temp;
458 ACPI_STATUS status;
459 static char *tmp_name = "_TMP";
460
461 ACPI_FUNCTION_NAME ("acpi_tz_get_temperature");
462
463 /* Evaluate the thermal zone's _TMP method. */
464 status = acpi_GetInteger(sc->tz_handle, tmp_name, &temp);
465 if (ACPI_FAILURE(status)) {
466 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
467 "error fetching current temperature -- %s\n",
468 AcpiFormatException(status));
469 return (FALSE);
470 }
471
472 /* Check it for validity. */
473 acpi_tz_sanity(sc, &temp, tmp_name);
474 if (temp == -1)
475 return (FALSE);
476
477 ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "got %d.%dC\n", TZ_KELVTOC(temp)));
478 sc->tz_temperature = temp;
479 return (TRUE);
480 }
481
482 /*
483 * Evaluate the condition of a thermal zone, take appropriate actions.
484 */
485 static void
486 acpi_tz_monitor(void *Context)
487 {
488 struct acpi_tz_softc *sc;
489 struct timespec curtime;
490 int temp;
491 int i;
492 int newactive, newflags;
493
494 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
495
496 sc = (struct acpi_tz_softc *)Context;
497
498 /* Get the current temperature. */
499 if (!acpi_tz_get_temperature(sc)) {
500 /* XXX disable zone? go to max cooling? */
501 return_VOID;
502 }
503 temp = sc->tz_temperature;
504
505 /*
506 * Work out what we ought to be doing right now.
507 *
508 * Note that the _ACx levels sort from hot to cold.
509 */
510 newactive = TZ_ACTIVE_NONE;
511 for (i = TZ_NUMLEVELS - 1; i >= 0; i--) {
512 if (sc->tz_zone.ac[i] != -1 && temp >= sc->tz_zone.ac[i]) {
513 newactive = i;
514 if (sc->tz_active != newactive) {
515 ACPI_VPRINT(sc->tz_dev,
516 acpi_device_get_parent_softc(sc->tz_dev),
517 "_AC%d: temperature %d.%d >= setpoint %d.%d\n", i,
518 TZ_KELVTOC(temp), TZ_KELVTOC(sc->tz_zone.ac[i]));
519 }
520 }
521 }
522
523 /*
524 * We are going to get _ACx level down (colder side), but give a guaranteed
525 * minimum cooling run time if requested.
526 */
527 if (acpi_tz_min_runtime > 0 && sc->tz_active != TZ_ACTIVE_NONE &&
528 sc->tz_active != TZ_ACTIVE_UNKNOWN &&
529 (newactive == TZ_ACTIVE_NONE || newactive > sc->tz_active)) {
530
531 getnanotime(&curtime);
532 timespecsub(&curtime, &sc->tz_cooling_started);
533 if (curtime.tv_sec < acpi_tz_min_runtime)
534 newactive = sc->tz_active;
535 }
536
537 /* Handle user override of active mode */
538 if (sc->tz_requested != TZ_ACTIVE_NONE && (newactive == TZ_ACTIVE_NONE
539 || sc->tz_requested < newactive))
540 newactive = sc->tz_requested;
541
542 /* update temperature-related flags */
543 newflags = TZ_THFLAG_NONE;
544 if (sc->tz_zone.psv != -1 && temp >= sc->tz_zone.psv)
545 newflags |= TZ_THFLAG_PSV;
546 if (sc->tz_zone.hot != -1 && temp >= sc->tz_zone.hot)
547 newflags |= TZ_THFLAG_HOT;
548 if (sc->tz_zone.crt != -1 && temp >= sc->tz_zone.crt)
549 newflags |= TZ_THFLAG_CRT;
550
551 /* If the active cooling state has changed, we have to switch things. */
552 if (sc->tz_active == TZ_ACTIVE_UNKNOWN) {
553 /*
554 * We don't know which cooling device is on or off,
555 * so stop them all, because we now know which
556 * should be on (if any).
557 */
558 for (i = 0; i < TZ_NUMLEVELS; i++) {
559 if (sc->tz_zone.al[i].Pointer != NULL) {
560 acpi_ForeachPackageObject(
561 (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
562 acpi_tz_switch_cooler_off, sc);
563 }
564 }
565 /* now we know that all devices are off */
566 sc->tz_active = TZ_ACTIVE_NONE;
567 }
568
569 if (newactive != sc->tz_active) {
570 /* Turn off unneeded cooling devices that are on, if any are */
571 for (i = TZ_ACTIVE_LEVEL(sc->tz_active);
572 i < TZ_ACTIVE_LEVEL(newactive); i++) {
573 acpi_ForeachPackageObject(
574 (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
575 acpi_tz_switch_cooler_off, sc);
576 }
577 /* Turn on cooling devices that are required, if any are */
578 for (i = TZ_ACTIVE_LEVEL(sc->tz_active) - 1;
579 i >= TZ_ACTIVE_LEVEL(newactive); i--) {
580 acpi_ForeachPackageObject(
581 (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
582 acpi_tz_switch_cooler_on, sc);
583 }
584
585 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
586 "switched from %s to %s: %d.%dC\n",
587 acpi_tz_aclevel_string(sc->tz_active),
588 acpi_tz_aclevel_string(newactive), TZ_KELVTOC(temp));
589 sc->tz_active = newactive;
590 getnanotime(&sc->tz_cooling_started);
591 }
592
593 /* XXX (de)activate any passive cooling that may be required. */
594
595 /*
596 * If the temperature is at _HOT or _CRT, increment our event count.
597 * If it has occurred enough times, shutdown the system. This is
598 * needed because some systems will report an invalid high temperature
599 * for one poll cycle. It is suspected this is due to the embedded
600 * controller timing out. A typical value is 138C for one cycle on
601 * a system that is otherwise 65C.
602 *
603 * If we're almost at that threshold, notify the user through devd(8).
604 */
605 if ((newflags & (TZ_THFLAG_HOT | TZ_THFLAG_CRT)) != 0) {
606 sc->tz_validchecks++;
607 if (sc->tz_validchecks == TZ_VALIDCHECKS) {
608 device_printf(sc->tz_dev,
609 "WARNING - current temperature (%d.%dC) exceeds safe limits\n",
610 TZ_KELVTOC(sc->tz_temperature));
611 shutdown_nice(RB_POWEROFF);
612 } else if (sc->tz_validchecks == TZ_NOTIFYCOUNT)
613 acpi_UserNotify("Thermal", sc->tz_handle, TZ_NOTIFY_CRITICAL);
614 } else {
615 sc->tz_validchecks = 0;
616 }
617 sc->tz_thflags = newflags;
618
619 return_VOID;
620 }
621
622 /*
623 * Given an object, verify that it's a reference to a device of some sort,
624 * and try to switch it off.
625 */
626 static void
627 acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg)
628 {
629 ACPI_HANDLE cooler;
630
631 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
632
633 cooler = acpi_GetReference(NULL, obj);
634 if (cooler == NULL) {
635 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n"));
636 return_VOID;
637 }
638
639 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s off\n",
640 acpi_name(cooler)));
641 acpi_pwr_switch_consumer(cooler, ACPI_STATE_D3);
642
643 return_VOID;
644 }
645
646 /*
647 * Given an object, verify that it's a reference to a device of some sort,
648 * and try to switch it on.
649 *
650 * XXX replication of off/on function code is bad.
651 */
652 static void
653 acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg)
654 {
655 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg;
656 ACPI_HANDLE cooler;
657 ACPI_STATUS status;
658
659 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
660
661 cooler = acpi_GetReference(NULL, obj);
662 if (cooler == NULL) {
663 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n"));
664 return_VOID;
665 }
666
667 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s on\n",
668 acpi_name(cooler)));
669 status = acpi_pwr_switch_consumer(cooler, ACPI_STATE_D0);
670 if (ACPI_FAILURE(status)) {
671 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
672 "failed to activate %s - %s\n", acpi_name(cooler),
673 AcpiFormatException(status));
674 }
675
676 return_VOID;
677 }
678
679 /*
680 * Read/debug-print a parameter, default it to -1.
681 */
682 static void
683 acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data)
684 {
685
686 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
687
688 if (ACPI_FAILURE(acpi_GetInteger(sc->tz_handle, node, data))) {
689 *data = -1;
690 } else {
691 ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "%s.%s = %d\n",
692 acpi_name(sc->tz_handle), node, *data));
693 }
694
695 return_VOID;
696 }
697
698 /*
699 * Sanity-check a temperature value. Assume that setpoints
700 * should be between 0C and 200C.
701 */
702 static void
703 acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what)
704 {
705 if (*val != -1 && (*val < TZ_ZEROC || *val > TZ_ZEROC + 2000)) {
706 device_printf(sc->tz_dev, "%s value is absurd, ignored (%d.%dC)\n",
707 what, TZ_KELVTOC(*val));
708 *val = -1;
709 }
710 }
711
712 /*
713 * Respond to a sysctl on the active state node.
714 */
715 static int
716 acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS)
717 {
718 struct acpi_tz_softc *sc;
719 int active;
720 int error;
721
722 sc = (struct acpi_tz_softc *)oidp->oid_arg1;
723 active = sc->tz_active;
724 error = sysctl_handle_int(oidp, &active, 0, req);
725
726 /* Error or no new value */
727 if (error != 0 || req->newptr == NULL)
728 return (error);
729 if (active < -1 || active >= TZ_NUMLEVELS)
730 return (EINVAL);
731
732 /* Set new preferred level and re-switch */
733 sc->tz_requested = active;
734 acpi_tz_signal(sc, 0);
735 return (0);
736 }
737
738 static int
739 acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS)
740 {
741 struct acpi_tz_softc *sc;
742 int enabled, error;
743
744 sc = (struct acpi_tz_softc *)oidp->oid_arg1;
745 enabled = sc->tz_cooling_enabled;
746 error = sysctl_handle_int(oidp, &enabled, 0, req);
747
748 /* Error or no new value */
749 if (error != 0 || req->newptr == NULL)
750 return (error);
751 if (enabled != TRUE && enabled != FALSE)
752 return (EINVAL);
753
754 if (enabled) {
755 if (acpi_tz_cooling_is_available(sc))
756 error = acpi_tz_cooling_thread_start(sc);
757 else
758 error = ENODEV;
759 if (error)
760 enabled = FALSE;
761 }
762 sc->tz_cooling_enabled = enabled;
763 return (error);
764 }
765
766 static int
767 acpi_tz_temp_sysctl(SYSCTL_HANDLER_ARGS)
768 {
769 struct acpi_tz_softc *sc;
770 int temp, *temp_ptr;
771 int error;
772
773 sc = oidp->oid_arg1;
774 temp_ptr = (int *)((uintptr_t)sc + oidp->oid_arg2);
775 temp = *temp_ptr;
776 error = sysctl_handle_int(oidp, &temp, 0, req);
777
778 /* Error or no new value */
779 if (error != 0 || req->newptr == NULL)
780 return (error);
781
782 /* Only allow changing settings if override is set. */
783 if (!acpi_tz_override)
784 return (EPERM);
785
786 /* Check user-supplied value for sanity. */
787 acpi_tz_sanity(sc, &temp, "user-supplied temp");
788 if (temp == -1)
789 return (EINVAL);
790
791 *temp_ptr = temp;
792 return (0);
793 }
794
795 static int
796 acpi_tz_passive_sysctl(SYSCTL_HANDLER_ARGS)
797 {
798 struct acpi_tz_softc *sc;
799 int val, *val_ptr;
800 int error;
801
802 sc = oidp->oid_arg1;
803 val_ptr = (int *)((uintptr_t)sc + oidp->oid_arg2);
804 val = *val_ptr;
805 error = sysctl_handle_int(oidp, &val, 0, req);
806
807 /* Error or no new value */
808 if (error != 0 || req->newptr == NULL)
809 return (error);
810
811 /* Only allow changing settings if override is set. */
812 if (!acpi_tz_override)
813 return (EPERM);
814
815 *val_ptr = val;
816 return (0);
817 }
818
819 static void
820 acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
821 {
822 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)context;
823
824 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
825
826 switch (notify) {
827 case TZ_NOTIFY_TEMPERATURE:
828 /* Temperature change occurred */
829 acpi_tz_signal(sc, 0);
830 break;
831 case TZ_NOTIFY_DEVICES:
832 case TZ_NOTIFY_LEVELS:
833 /* Zone devices/setpoints changed */
834 acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS);
835 break;
836 default:
837 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
838 "unknown Notify event 0x%x\n", notify);
839 break;
840 }
841
842 acpi_UserNotify("Thermal", h, notify);
843
844 return_VOID;
845 }
846
847 static void
848 acpi_tz_signal(struct acpi_tz_softc *sc, int flags)
849 {
850 ACPI_LOCK(thermal);
851 sc->tz_flags |= flags;
852 ACPI_UNLOCK(thermal);
853 wakeup(&acpi_tz_proc);
854 }
855
856 /*
857 * Notifies can be generated asynchronously but have also been seen to be
858 * triggered by other thermal methods. One system generates a notify of
859 * 0x81 when the fan is turned on or off. Another generates it when _SCP
860 * is called. To handle these situations, we check the zone via
861 * acpi_tz_monitor() before evaluating changes to setpoints or the cooling
862 * policy.
863 */
864 static void
865 acpi_tz_timeout(struct acpi_tz_softc *sc, int flags)
866 {
867
868 /* Check the current temperature and take action based on it */
869 acpi_tz_monitor(sc);
870
871 /* If requested, get the power profile settings. */
872 if (flags & TZ_FLAG_GETPROFILE)
873 acpi_tz_power_profile(sc);
874
875 /*
876 * If requested, check for new devices/setpoints. After finding them,
877 * check if we need to switch fans based on the new values.
878 */
879 if (flags & TZ_FLAG_GETSETTINGS) {
880 acpi_tz_establish(sc);
881 acpi_tz_monitor(sc);
882 }
883
884 /* XXX passive cooling actions? */
885 }
886
887 /*
888 * System power profile may have changed; fetch and notify the
889 * thermal zone accordingly.
890 *
891 * Since this can be called from an arbitrary eventhandler, it needs
892 * to get the ACPI lock itself.
893 */
894 static void
895 acpi_tz_power_profile(void *arg)
896 {
897 ACPI_STATUS status;
898 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg;
899 int state;
900
901 state = power_profile_get_state();
902 if (state != POWER_PROFILE_PERFORMANCE && state != POWER_PROFILE_ECONOMY)
903 return;
904
905 /* check that we haven't decided there's no _SCP method */
906 if ((sc->tz_flags & TZ_FLAG_NO_SCP) == 0) {
907
908 /* Call _SCP to set the new profile */
909 status = acpi_SetInteger(sc->tz_handle, "_SCP",
910 (state == POWER_PROFILE_PERFORMANCE) ? 0 : 1);
911 if (ACPI_FAILURE(status)) {
912 if (status != AE_NOT_FOUND)
913 ACPI_VPRINT(sc->tz_dev,
914 acpi_device_get_parent_softc(sc->tz_dev),
915 "can't evaluate %s._SCP - %s\n",
916 acpi_name(sc->tz_handle),
917 AcpiFormatException(status));
918 sc->tz_flags |= TZ_FLAG_NO_SCP;
919 } else {
920 /* We have to re-evaluate the entire zone now */
921 acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS);
922 }
923 }
924 }
925
926 /*
927 * Thermal zone monitor thread.
928 */
929 static void
930 acpi_tz_thread(void *arg)
931 {
932 device_t *devs;
933 int devcount, i;
934 int flags;
935 struct acpi_tz_softc **sc;
936
937 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
938
939 devs = NULL;
940 devcount = 0;
941 sc = NULL;
942
943 for (;;) {
944 /* If the number of devices has changed, re-evaluate. */
945 if (devclass_get_count(acpi_tz_devclass) != devcount) {
946 if (devs != NULL) {
947 free(devs, M_TEMP);
948 free(sc, M_TEMP);
949 }
950 devclass_get_devices(acpi_tz_devclass, &devs, &devcount);
951 sc = malloc(sizeof(struct acpi_tz_softc *) * devcount, M_TEMP,
952 M_WAITOK | M_ZERO);
953 for (i = 0; i < devcount; i++)
954 sc[i] = device_get_softc(devs[i]);
955 }
956
957 /* Check for temperature events and act on them. */
958 for (i = 0; i < devcount; i++) {
959 ACPI_LOCK(thermal);
960 flags = sc[i]->tz_flags;
961 sc[i]->tz_flags &= TZ_FLAG_NO_SCP;
962 ACPI_UNLOCK(thermal);
963 acpi_tz_timeout(sc[i], flags);
964 }
965
966 /* If more work to do, don't go to sleep yet. */
967 ACPI_LOCK(thermal);
968 for (i = 0; i < devcount; i++) {
969 if (sc[i]->tz_flags & ~TZ_FLAG_NO_SCP)
970 break;
971 }
972
973 /*
974 * If we have no more work, sleep for a while, setting PDROP so that
975 * the mutex will not be reacquired. Otherwise, drop the mutex and
976 * loop to handle more events.
977 */
978 if (i == devcount)
979 msleep(&acpi_tz_proc, &thermal_mutex, PZERO | PDROP, "tzpoll",
980 hz * acpi_tz_polling_rate);
981 else
982 ACPI_UNLOCK(thermal);
983 }
984 }
985
986 static int
987 acpi_tz_cpufreq_restore(struct acpi_tz_softc *sc)
988 {
989 device_t dev;
990 int error;
991
992 if (!sc->tz_cooling_updated)
993 return (0);
994 if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL)
995 return (ENXIO);
996 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
997 "temperature %d.%dC: resuming previous clock speed (%d MHz)\n",
998 TZ_KELVTOC(sc->tz_temperature), sc->tz_cooling_saved_freq);
999 error = CPUFREQ_SET(dev, NULL, CPUFREQ_PRIO_KERN);
1000 if (error == 0)
1001 sc->tz_cooling_updated = FALSE;
1002 return (error);
1003 }
1004
1005 static int
1006 acpi_tz_cpufreq_update(struct acpi_tz_softc *sc, int req)
1007 {
1008 device_t dev;
1009 struct cf_level *levels;
1010 int num_levels, error, freq, desired_freq, perf, i;
1011
1012 levels = malloc(CPUFREQ_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT);
1013 if (levels == NULL)
1014 return (ENOMEM);
1015
1016 /*
1017 * Find the main device, cpufreq0. We don't yet support independent
1018 * CPU frequency control on SMP.
1019 */
1020 if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL) {
1021 error = ENXIO;
1022 goto out;
1023 }
1024
1025 /* Get the current frequency. */
1026 error = CPUFREQ_GET(dev, &levels[0]);
1027 if (error)
1028 goto out;
1029 freq = levels[0].total_set.freq;
1030
1031 /* Get the current available frequency levels. */
1032 num_levels = CPUFREQ_MAX_LEVELS;
1033 error = CPUFREQ_LEVELS(dev, levels, &num_levels);
1034 if (error) {
1035 if (error == E2BIG)
1036 printf("cpufreq: need to increase CPUFREQ_MAX_LEVELS\n");
1037 goto out;
1038 }
1039
1040 /* Calculate the desired frequency as a percent of the max frequency. */
1041 perf = 100 * freq / levels[0].total_set.freq - req;
1042 if (perf < 0)
1043 perf = 0;
1044 else if (perf > 100)
1045 perf = 100;
1046 desired_freq = levels[0].total_set.freq * perf / 100;
1047
1048 if (desired_freq < freq) {
1049 /* Find the closest available frequency, rounding down. */
1050 for (i = 0; i < num_levels; i++)
1051 if (levels[i].total_set.freq <= desired_freq)
1052 break;
1053
1054 /* If we didn't find a relevant setting, use the lowest. */
1055 if (i == num_levels)
1056 i--;
1057 } else {
1058 /* If we didn't decrease frequency yet, don't increase it. */
1059 if (!sc->tz_cooling_updated) {
1060 sc->tz_cooling_active = FALSE;
1061 goto out;
1062 }
1063
1064 /* Use saved cpu frequency as maximum value. */
1065 if (desired_freq > sc->tz_cooling_saved_freq)
1066 desired_freq = sc->tz_cooling_saved_freq;
1067
1068 /* Find the closest available frequency, rounding up. */
1069 for (i = num_levels - 1; i >= 0; i--)
1070 if (levels[i].total_set.freq >= desired_freq)
1071 break;
1072
1073 /* If we didn't find a relevant setting, use the highest. */
1074 if (i == -1)
1075 i++;
1076
1077 /* If we're going to the highest frequency, restore the old setting. */
1078 if (i == 0 || desired_freq == sc->tz_cooling_saved_freq) {
1079 error = acpi_tz_cpufreq_restore(sc);
1080 if (error == 0)
1081 sc->tz_cooling_active = FALSE;
1082 goto out;
1083 }
1084 }
1085
1086 /* If we are going to a new frequency, activate it. */
1087 if (levels[i].total_set.freq != freq) {
1088 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
1089 "temperature %d.%dC: %screasing clock speed "
1090 "from %d MHz to %d MHz\n",
1091 TZ_KELVTOC(sc->tz_temperature),
1092 (freq > levels[i].total_set.freq) ? "de" : "in",
1093 freq, levels[i].total_set.freq);
1094 error = CPUFREQ_SET(dev, &levels[i], CPUFREQ_PRIO_KERN);
1095 if (error == 0 && !sc->tz_cooling_updated) {
1096 sc->tz_cooling_saved_freq = freq;
1097 sc->tz_cooling_updated = TRUE;
1098 }
1099 }
1100
1101 out:
1102 if (levels)
1103 free(levels, M_TEMP);
1104 return (error);
1105 }
1106
1107 /*
1108 * Passive cooling thread; monitors current temperature according to the
1109 * cooling interval and calculates whether to scale back CPU frequency.
1110 */
1111 static void
1112 acpi_tz_cooling_thread(void *arg)
1113 {
1114 struct acpi_tz_softc *sc;
1115 int error, perf, curr_temp, prev_temp;
1116
1117 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
1118
1119 sc = (struct acpi_tz_softc *)arg;
1120
1121 prev_temp = sc->tz_temperature;
1122 while (sc->tz_cooling_enabled) {
1123 if (sc->tz_cooling_active)
1124 (void)acpi_tz_get_temperature(sc);
1125 curr_temp = sc->tz_temperature;
1126 if (curr_temp >= sc->tz_zone.psv)
1127 sc->tz_cooling_active = TRUE;
1128 if (sc->tz_cooling_active) {
1129 perf = sc->tz_zone.tc1 * (curr_temp - prev_temp) +
1130 sc->tz_zone.tc2 * (curr_temp - sc->tz_zone.psv);
1131 perf /= 10;
1132
1133 if (perf != 0) {
1134 error = acpi_tz_cpufreq_update(sc, perf);
1135
1136 /*
1137 * If error and not simply a higher priority setting was
1138 * active, disable cooling.
1139 */
1140 if (error != 0 && error != EPERM) {
1141 device_printf(sc->tz_dev,
1142 "failed to set new freq, disabling passive cooling\n");
1143 sc->tz_cooling_enabled = FALSE;
1144 }
1145 }
1146 }
1147 prev_temp = curr_temp;
1148 tsleep(&sc->tz_cooling_proc, PZERO, "cooling",
1149 hz * sc->tz_zone.tsp / 10);
1150 }
1151 if (sc->tz_cooling_active) {
1152 acpi_tz_cpufreq_restore(sc);
1153 sc->tz_cooling_active = FALSE;
1154 }
1155 sc->tz_cooling_proc = NULL;
1156 ACPI_LOCK(thermal);
1157 sc->tz_cooling_proc_running = FALSE;
1158 ACPI_UNLOCK(thermal);
1159 kproc_exit(0);
1160 }
1161
1162 /*
1163 * TODO: We ignore _PSL (list of cooling devices) since cpufreq enumerates
1164 * all CPUs for us. However, it's possible in the future _PSL will
1165 * reference non-CPU devices so we may want to support it then.
1166 */
1167 static int
1168 acpi_tz_cooling_is_available(struct acpi_tz_softc *sc)
1169 {
1170 return (sc->tz_zone.tc1 != -1 && sc->tz_zone.tc2 != -1 &&
1171 sc->tz_zone.tsp != -1 && sc->tz_zone.tsp != 0 &&
1172 sc->tz_zone.psv != -1);
1173 }
1174
1175 static int
1176 acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc)
1177 {
1178 int error;
1179
1180 ACPI_LOCK(thermal);
1181 if (sc->tz_cooling_proc_running) {
1182 ACPI_UNLOCK(thermal);
1183 return (0);
1184 }
1185 sc->tz_cooling_proc_running = TRUE;
1186 ACPI_UNLOCK(thermal);
1187 error = 0;
1188 if (sc->tz_cooling_proc == NULL) {
1189 error = kproc_create(acpi_tz_cooling_thread, sc,
1190 &sc->tz_cooling_proc, RFHIGHPID, 0, "acpi_cooling%d",
1191 device_get_unit(sc->tz_dev));
1192 if (error != 0) {
1193 device_printf(sc->tz_dev, "could not create thread - %d", error);
1194 ACPI_LOCK(thermal);
1195 sc->tz_cooling_proc_running = FALSE;
1196 ACPI_UNLOCK(thermal);
1197 }
1198 }
1199 return (error);
1200 }
Cache object: cb630216876d7f05fd95fe702ef136a7
|