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/6.1/sys/dev/acpica/acpi_thermal.c 152152 2005-11-07 09:53:25Z obrien $");
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), (((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 void acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify,
136 void *context);
137 static void acpi_tz_signal(struct acpi_tz_softc *sc, int flags);
138 static void acpi_tz_timeout(struct acpi_tz_softc *sc, int flags);
139 static void acpi_tz_power_profile(void *arg);
140 static void acpi_tz_thread(void *arg);
141 static int acpi_tz_cooling_is_available(struct acpi_tz_softc *sc);
142 static int acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc);
143
144 static device_method_t acpi_tz_methods[] = {
145 /* Device interface */
146 DEVMETHOD(device_probe, acpi_tz_probe),
147 DEVMETHOD(device_attach, acpi_tz_attach),
148
149 {0, 0}
150 };
151
152 static driver_t acpi_tz_driver = {
153 "acpi_tz",
154 acpi_tz_methods,
155 sizeof(struct acpi_tz_softc),
156 };
157
158 static devclass_t acpi_tz_devclass;
159 DRIVER_MODULE(acpi_tz, acpi, acpi_tz_driver, acpi_tz_devclass, 0, 0);
160 MODULE_DEPEND(acpi_tz, acpi, 1, 1, 1);
161
162 static struct sysctl_ctx_list acpi_tz_sysctl_ctx;
163 static struct sysctl_oid *acpi_tz_sysctl_tree;
164
165 /* Minimum cooling run time */
166 static int acpi_tz_min_runtime = 0;
167 static int acpi_tz_polling_rate = TZ_POLLRATE;
168
169 /* Timezone polling thread */
170 static struct proc *acpi_tz_proc;
171 ACPI_LOCK_DECL(thermal, "ACPI thermal zone");
172
173 static int
174 acpi_tz_probe(device_t dev)
175 {
176 int result;
177
178 if (acpi_get_type(dev) == ACPI_TYPE_THERMAL && !acpi_disabled("thermal")) {
179 device_set_desc(dev, "Thermal Zone");
180 result = -10;
181 } else
182 result = ENXIO;
183 return (result);
184 }
185
186 static int
187 acpi_tz_attach(device_t dev)
188 {
189 struct acpi_tz_softc *sc;
190 struct acpi_softc *acpi_sc;
191 int error;
192 char oidname[8];
193
194 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
195
196 sc = device_get_softc(dev);
197 sc->tz_dev = dev;
198 sc->tz_handle = acpi_get_handle(dev);
199 sc->tz_requested = TZ_ACTIVE_NONE;
200 sc->tz_active = TZ_ACTIVE_NONE;
201 sc->tz_thflags = TZ_THFLAG_NONE;
202 sc->tz_cooling_proc = NULL;
203 sc->tz_cooling_proc_running = FALSE;
204 sc->tz_cooling_active = FALSE;
205 sc->tz_cooling_updated = FALSE;
206
207 /*
208 * Always attempt to enable passive cooling for tz0. Users can enable
209 * it for other zones manually for now.
210 *
211 * XXX We need to test if multiple zones conflict with each other
212 * since cpufreq currently sets all CPUs to the given frequency whereas
213 * it's possible for different thermal zones to specify independent
214 * settings for multiple CPUs.
215 */
216 sc->tz_cooling_enabled = (device_get_unit(dev) == 0);
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_RD | 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_RD | CTLFLAG_RW,
251 &acpi_tz_polling_rate, 0, "monitor polling rate");
252 }
253 sysctl_ctx_init(&sc->tz_sysctl_ctx);
254 sprintf(oidname, "tz%d", device_get_unit(dev));
255 sc->tz_sysctl_tree = SYSCTL_ADD_NODE(&sc->tz_sysctl_ctx,
256 SYSCTL_CHILDREN(acpi_tz_sysctl_tree),
257 OID_AUTO, oidname, CTLFLAG_RD, 0, "");
258 SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
259 OID_AUTO, "temperature", CTLFLAG_RD, &sc->tz_temperature,
260 sizeof(sc->tz_temperature), "IK",
261 "current thermal zone temperature");
262 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
263 OID_AUTO, "active", CTLTYPE_INT | CTLFLAG_RW,
264 sc, 0, acpi_tz_active_sysctl, "I", "");
265 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
266 OID_AUTO, "passive_cooling", CTLTYPE_INT | CTLFLAG_RW,
267 sc, 0, acpi_tz_cooling_sysctl, "I", "");
268
269 SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
270 OID_AUTO, "thermal_flags", CTLFLAG_RD,
271 &sc->tz_thflags, 0, "thermal zone flags");
272 SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
273 OID_AUTO, "_PSV", CTLFLAG_RD, &sc->tz_zone.psv,
274 sizeof(sc->tz_zone.psv), "IK", "");
275 SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
276 OID_AUTO, "_HOT", CTLFLAG_RD, &sc->tz_zone.hot,
277 sizeof(sc->tz_zone.hot), "IK", "");
278 SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
279 OID_AUTO, "_CRT", CTLFLAG_RD, &sc->tz_zone.crt,
280 sizeof(sc->tz_zone.crt), "IK", "");
281 SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
282 OID_AUTO, "_ACx", CTLFLAG_RD, &sc->tz_zone.ac,
283 sizeof(sc->tz_zone.ac), "IK", "");
284
285 /*
286 * Create thread to service all of the thermal zones. Register
287 * our power profile event handler.
288 */
289 sc->tz_event = EVENTHANDLER_REGISTER(power_profile_change,
290 acpi_tz_power_profile, sc, 0);
291 if (acpi_tz_proc == NULL) {
292 error = kthread_create(acpi_tz_thread, NULL, &acpi_tz_proc,
293 RFHIGHPID, 0, "acpi_thermal");
294 if (error != 0) {
295 device_printf(sc->tz_dev, "could not create thread - %d", error);
296 goto out;
297 }
298 }
299
300 /* Create a thread to handle passive cooling for each zone if enabled. */
301 if (sc->tz_cooling_enabled) {
302 if (acpi_tz_cooling_is_available(sc)) {
303 error = acpi_tz_cooling_thread_start(sc);
304 if (error != 0) {
305 sc->tz_cooling_enabled = FALSE;
306 goto out;
307 }
308 } else
309 sc->tz_cooling_enabled = FALSE;
310 }
311
312 /*
313 * Flag the event handler for a manual invocation by our timeout.
314 * We defer it like this so that the rest of the subsystem has time
315 * to come up. Don't bother evaluating/printing the temperature at
316 * this point; on many systems it'll be bogus until the EC is running.
317 */
318 sc->tz_flags |= TZ_FLAG_GETPROFILE;
319
320 out:
321 if (error != 0) {
322 EVENTHANDLER_DEREGISTER(power_profile_change, sc->tz_event);
323 AcpiRemoveNotifyHandler(sc->tz_handle, ACPI_DEVICE_NOTIFY,
324 acpi_tz_notify_handler);
325 sysctl_ctx_free(&sc->tz_sysctl_ctx);
326 }
327 return_VALUE (error);
328 }
329
330 /*
331 * Parse the current state of this thermal zone and set up to use it.
332 *
333 * Note that we may have previous state, which will have to be discarded.
334 */
335 static int
336 acpi_tz_establish(struct acpi_tz_softc *sc)
337 {
338 ACPI_OBJECT *obj;
339 int i;
340 char nbuf[8];
341
342 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
343
344 /* Erase any existing state. */
345 for (i = 0; i < TZ_NUMLEVELS; i++)
346 if (sc->tz_zone.al[i].Pointer != NULL)
347 AcpiOsFree(sc->tz_zone.al[i].Pointer);
348 if (sc->tz_zone.psl.Pointer != NULL)
349 AcpiOsFree(sc->tz_zone.psl.Pointer);
350
351 /*
352 * XXX: We initialize only ACPI_BUFFER to avoid race condition
353 * with passive cooling thread which refers psv, tc1, tc2 and tsp.
354 */
355 bzero(sc->tz_zone.ac, sizeof(sc->tz_zone.ac));
356 bzero(sc->tz_zone.al, sizeof(sc->tz_zone.al));
357 bzero(&sc->tz_zone.psl, sizeof(sc->tz_zone.psl));
358
359 /* Evaluate thermal zone parameters. */
360 for (i = 0; i < TZ_NUMLEVELS; i++) {
361 sprintf(nbuf, "_AC%d", i);
362 acpi_tz_getparam(sc, nbuf, &sc->tz_zone.ac[i]);
363 sprintf(nbuf, "_AL%d", i);
364 sc->tz_zone.al[i].Length = ACPI_ALLOCATE_BUFFER;
365 sc->tz_zone.al[i].Pointer = NULL;
366 AcpiEvaluateObject(sc->tz_handle, nbuf, NULL, &sc->tz_zone.al[i]);
367 obj = (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer;
368 if (obj != NULL) {
369 /* Should be a package containing a list of power objects */
370 if (obj->Type != ACPI_TYPE_PACKAGE) {
371 device_printf(sc->tz_dev, "%s has unknown type %d, rejecting\n",
372 nbuf, obj->Type);
373 return_VALUE (ENXIO);
374 }
375 }
376 }
377 acpi_tz_getparam(sc, "_CRT", &sc->tz_zone.crt);
378 acpi_tz_getparam(sc, "_HOT", &sc->tz_zone.hot);
379 sc->tz_zone.psl.Length = ACPI_ALLOCATE_BUFFER;
380 sc->tz_zone.psl.Pointer = NULL;
381 AcpiEvaluateObject(sc->tz_handle, "_PSL", NULL, &sc->tz_zone.psl);
382 acpi_tz_getparam(sc, "_PSV", &sc->tz_zone.psv);
383 acpi_tz_getparam(sc, "_TC1", &sc->tz_zone.tc1);
384 acpi_tz_getparam(sc, "_TC2", &sc->tz_zone.tc2);
385 acpi_tz_getparam(sc, "_TSP", &sc->tz_zone.tsp);
386 acpi_tz_getparam(sc, "_TZP", &sc->tz_zone.tzp);
387
388 /*
389 * Sanity-check the values we've been given.
390 *
391 * XXX what do we do about systems that give us the same value for
392 * more than one of these setpoints?
393 */
394 acpi_tz_sanity(sc, &sc->tz_zone.crt, "_CRT");
395 acpi_tz_sanity(sc, &sc->tz_zone.hot, "_HOT");
396 acpi_tz_sanity(sc, &sc->tz_zone.psv, "_PSV");
397 for (i = 0; i < TZ_NUMLEVELS; i++)
398 acpi_tz_sanity(sc, &sc->tz_zone.ac[i], "_ACx");
399
400 return_VALUE (0);
401 }
402
403 static char *aclevel_string[] = {
404 "NONE", "_AC0", "_AC1", "_AC2", "_AC3", "_AC4",
405 "_AC5", "_AC6", "_AC7", "_AC8", "_AC9"
406 };
407
408 static __inline const char *
409 acpi_tz_aclevel_string(int active)
410 {
411 if (active < -1 || active >= TZ_NUMLEVELS)
412 return (aclevel_string[0]);
413
414 return (aclevel_string[active + 1]);
415 }
416
417 /*
418 * Get the current temperature.
419 */
420 static int
421 acpi_tz_get_temperature(struct acpi_tz_softc *sc)
422 {
423 int temp;
424 ACPI_STATUS status;
425
426 ACPI_FUNCTION_NAME ("acpi_tz_get_temperature");
427
428 status = acpi_GetInteger(sc->tz_handle, "_TMP", &temp);
429 if (ACPI_FAILURE(status)) {
430 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
431 "error fetching current temperature -- %s\n",
432 AcpiFormatException(status));
433 return (FALSE);
434 }
435
436 ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "got %d.%dC\n", TZ_KELVTOC(temp)));
437 sc->tz_temperature = temp;
438 return (TRUE);
439 }
440
441 /*
442 * Evaluate the condition of a thermal zone, take appropriate actions.
443 */
444 static void
445 acpi_tz_monitor(void *Context)
446 {
447 struct acpi_tz_softc *sc;
448 struct timespec curtime;
449 int temp;
450 int i;
451 int newactive, newflags;
452
453 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
454
455 sc = (struct acpi_tz_softc *)Context;
456
457 /* Get the current temperature. */
458 if (!acpi_tz_get_temperature(sc)) {
459 /* XXX disable zone? go to max cooling? */
460 return_VOID;
461 }
462 temp = sc->tz_temperature;
463
464 /*
465 * Work out what we ought to be doing right now.
466 *
467 * Note that the _ACx levels sort from hot to cold.
468 */
469 newactive = TZ_ACTIVE_NONE;
470 for (i = TZ_NUMLEVELS - 1; i >= 0; i--) {
471 if (sc->tz_zone.ac[i] != -1 && temp >= sc->tz_zone.ac[i]) {
472 newactive = i;
473 if (sc->tz_active != newactive) {
474 ACPI_VPRINT(sc->tz_dev,
475 acpi_device_get_parent_softc(sc->tz_dev),
476 "_AC%d: temperature %d.%d >= setpoint %d.%d\n", i,
477 TZ_KELVTOC(temp), TZ_KELVTOC(sc->tz_zone.ac[i]));
478 }
479 }
480 }
481
482 /*
483 * We are going to get _ACx level down (colder side), but give a guaranteed
484 * minimum cooling run time if requested.
485 */
486 if (acpi_tz_min_runtime > 0 && sc->tz_active != TZ_ACTIVE_NONE &&
487 (newactive == TZ_ACTIVE_NONE || newactive > sc->tz_active)) {
488
489 getnanotime(&curtime);
490 timespecsub(&curtime, &sc->tz_cooling_started);
491 if (curtime.tv_sec < acpi_tz_min_runtime)
492 newactive = sc->tz_active;
493 }
494
495 /* Handle user override of active mode */
496 if (sc->tz_requested != TZ_ACTIVE_NONE && sc->tz_requested < newactive)
497 newactive = sc->tz_requested;
498
499 /* update temperature-related flags */
500 newflags = TZ_THFLAG_NONE;
501 if (sc->tz_zone.psv != -1 && temp >= sc->tz_zone.psv)
502 newflags |= TZ_THFLAG_PSV;
503 if (sc->tz_zone.hot != -1 && temp >= sc->tz_zone.hot)
504 newflags |= TZ_THFLAG_HOT;
505 if (sc->tz_zone.crt != -1 && temp >= sc->tz_zone.crt)
506 newflags |= TZ_THFLAG_CRT;
507
508 /* If the active cooling state has changed, we have to switch things. */
509 if (newactive != sc->tz_active) {
510 /* Turn off the cooling devices that are on, if any are */
511 if (sc->tz_active != TZ_ACTIVE_NONE)
512 acpi_ForeachPackageObject(
513 (ACPI_OBJECT *)sc->tz_zone.al[sc->tz_active].Pointer,
514 acpi_tz_switch_cooler_off, sc);
515
516 /* Turn on cooling devices that are required, if any are */
517 if (newactive != TZ_ACTIVE_NONE) {
518 acpi_ForeachPackageObject(
519 (ACPI_OBJECT *)sc->tz_zone.al[newactive].Pointer,
520 acpi_tz_switch_cooler_on, sc);
521 }
522 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
523 "switched from %s to %s: %d.%dC\n",
524 acpi_tz_aclevel_string(sc->tz_active),
525 acpi_tz_aclevel_string(newactive), TZ_KELVTOC(temp));
526 sc->tz_active = newactive;
527 getnanotime(&sc->tz_cooling_started);
528 }
529
530 /* XXX (de)activate any passive cooling that may be required. */
531
532 /*
533 * If the temperature is at _HOT or _CRT, increment our event count.
534 * If it has occurred enough times, shutdown the system. This is
535 * needed because some systems will report an invalid high temperature
536 * for one poll cycle. It is suspected this is due to the embedded
537 * controller timing out. A typical value is 138C for one cycle on
538 * a system that is otherwise 65C.
539 *
540 * If we're almost at that threshold, notify the user through devd(8).
541 */
542 if ((newflags & (TZ_THFLAG_HOT | TZ_THFLAG_CRT)) != 0) {
543 sc->tz_validchecks++;
544 if (sc->tz_validchecks == TZ_VALIDCHECKS) {
545 device_printf(sc->tz_dev,
546 "WARNING - current temperature (%d.%dC) exceeds safe limits\n",
547 TZ_KELVTOC(sc->tz_temperature));
548 shutdown_nice(RB_POWEROFF);
549 } else if (sc->tz_validchecks == TZ_NOTIFYCOUNT)
550 acpi_UserNotify("Thermal", sc->tz_handle, TZ_NOTIFY_CRITICAL);
551 } else {
552 sc->tz_validchecks = 0;
553 }
554 sc->tz_thflags = newflags;
555
556 return_VOID;
557 }
558
559 /*
560 * Given an object, verify that it's a reference to a device of some sort,
561 * and try to switch it off.
562 */
563 static void
564 acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg)
565 {
566 ACPI_HANDLE cooler;
567
568 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
569
570 cooler = acpi_GetReference(NULL, obj);
571 if (cooler == NULL) {
572 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n"));
573 return_VOID;
574 }
575
576 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s off\n",
577 acpi_name(cooler)));
578 acpi_pwr_switch_consumer(cooler, ACPI_STATE_D3);
579
580 return_VOID;
581 }
582
583 /*
584 * Given an object, verify that it's a reference to a device of some sort,
585 * and try to switch it on.
586 *
587 * XXX replication of off/on function code is bad.
588 */
589 static void
590 acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg)
591 {
592 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg;
593 ACPI_HANDLE cooler;
594 ACPI_STATUS status;
595
596 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
597
598 cooler = acpi_GetReference(NULL, obj);
599 if (cooler == NULL) {
600 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n"));
601 return_VOID;
602 }
603
604 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s on\n",
605 acpi_name(cooler)));
606 status = acpi_pwr_switch_consumer(cooler, ACPI_STATE_D0);
607 if (ACPI_FAILURE(status)) {
608 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
609 "failed to activate %s - %s\n", acpi_name(cooler),
610 AcpiFormatException(status));
611 }
612
613 return_VOID;
614 }
615
616 /*
617 * Read/debug-print a parameter, default it to -1.
618 */
619 static void
620 acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data)
621 {
622
623 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
624
625 if (ACPI_FAILURE(acpi_GetInteger(sc->tz_handle, node, data))) {
626 *data = -1;
627 } else {
628 ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "%s.%s = %d\n",
629 acpi_name(sc->tz_handle), node, *data));
630 }
631
632 return_VOID;
633 }
634
635 /*
636 * Sanity-check a temperature value. Assume that setpoints
637 * should be between 0C and 150C.
638 */
639 static void
640 acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what)
641 {
642 if (*val != -1 && (*val < TZ_ZEROC || *val > TZ_ZEROC + 1500)) {
643 device_printf(sc->tz_dev, "%s value is absurd, ignored (%d.%dC)\n",
644 what, TZ_KELVTOC(*val));
645 *val = -1;
646 }
647 }
648
649 /*
650 * Respond to a sysctl on the active state node.
651 */
652 static int
653 acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS)
654 {
655 struct acpi_tz_softc *sc;
656 int active;
657 int error;
658
659 sc = (struct acpi_tz_softc *)oidp->oid_arg1;
660 active = sc->tz_active;
661 error = sysctl_handle_int(oidp, &active, 0, req);
662
663 /* Error or no new value */
664 if (error != 0 || req->newptr == NULL)
665 return (error);
666 if (active < -1 || active >= TZ_NUMLEVELS)
667 return (EINVAL);
668
669 /* Set new preferred level and re-switch */
670 sc->tz_requested = active;
671 acpi_tz_signal(sc, 0);
672 return (0);
673 }
674
675 static int
676 acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS)
677 {
678 struct acpi_tz_softc *sc;
679 int enabled, error;
680
681 sc = (struct acpi_tz_softc *)oidp->oid_arg1;
682 enabled = sc->tz_cooling_enabled;
683 error = sysctl_handle_int(oidp, &enabled, 0, req);
684
685 /* Error or no new value */
686 if (error != 0 || req->newptr == NULL)
687 return (error);
688 if (enabled != TRUE && enabled != FALSE)
689 return (EINVAL);
690
691 if (enabled) {
692 if (acpi_tz_cooling_is_available(sc))
693 error = acpi_tz_cooling_thread_start(sc);
694 else
695 error = ENODEV;
696 if (error)
697 enabled = FALSE;
698 }
699 sc->tz_cooling_enabled = enabled;
700 return (error);
701 }
702
703 static void
704 acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
705 {
706 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)context;
707
708 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
709
710 switch (notify) {
711 case TZ_NOTIFY_TEMPERATURE:
712 /* Temperature change occurred */
713 acpi_tz_signal(sc, 0);
714 break;
715 case TZ_NOTIFY_DEVICES:
716 case TZ_NOTIFY_LEVELS:
717 /* Zone devices/setpoints changed */
718 acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS);
719 break;
720 default:
721 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
722 "unknown Notify event 0x%x\n", notify);
723 break;
724 }
725
726 acpi_UserNotify("Thermal", h, notify);
727
728 return_VOID;
729 }
730
731 static void
732 acpi_tz_signal(struct acpi_tz_softc *sc, int flags)
733 {
734 ACPI_LOCK(thermal);
735 sc->tz_flags |= flags;
736 ACPI_UNLOCK(thermal);
737 wakeup(&acpi_tz_proc);
738 }
739
740 /*
741 * Notifies can be generated asynchronously but have also been seen to be
742 * triggered by other thermal methods. One system generates a notify of
743 * 0x81 when the fan is turned on or off. Another generates it when _SCP
744 * is called. To handle these situations, we check the zone via
745 * acpi_tz_monitor() before evaluating changes to setpoints or the cooling
746 * policy.
747 */
748 static void
749 acpi_tz_timeout(struct acpi_tz_softc *sc, int flags)
750 {
751
752 /* Check the current temperature and take action based on it */
753 acpi_tz_monitor(sc);
754
755 /* If requested, get the power profile settings. */
756 if (flags & TZ_FLAG_GETPROFILE)
757 acpi_tz_power_profile(sc);
758
759 /*
760 * If requested, check for new devices/setpoints. After finding them,
761 * check if we need to switch fans based on the new values.
762 */
763 if (flags & TZ_FLAG_GETSETTINGS) {
764 acpi_tz_establish(sc);
765 acpi_tz_monitor(sc);
766 }
767
768 /* XXX passive cooling actions? */
769 }
770
771 /*
772 * System power profile may have changed; fetch and notify the
773 * thermal zone accordingly.
774 *
775 * Since this can be called from an arbitrary eventhandler, it needs
776 * to get the ACPI lock itself.
777 */
778 static void
779 acpi_tz_power_profile(void *arg)
780 {
781 ACPI_STATUS status;
782 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg;
783 int state;
784
785 state = power_profile_get_state();
786 if (state != POWER_PROFILE_PERFORMANCE && state != POWER_PROFILE_ECONOMY)
787 return;
788
789 /* check that we haven't decided there's no _SCP method */
790 if ((sc->tz_flags & TZ_FLAG_NO_SCP) == 0) {
791
792 /* Call _SCP to set the new profile */
793 status = acpi_SetInteger(sc->tz_handle, "_SCP",
794 (state == POWER_PROFILE_PERFORMANCE) ? 0 : 1);
795 if (ACPI_FAILURE(status)) {
796 if (status != AE_NOT_FOUND)
797 ACPI_VPRINT(sc->tz_dev,
798 acpi_device_get_parent_softc(sc->tz_dev),
799 "can't evaluate %s._SCP - %s\n",
800 acpi_name(sc->tz_handle),
801 AcpiFormatException(status));
802 sc->tz_flags |= TZ_FLAG_NO_SCP;
803 } else {
804 /* We have to re-evaluate the entire zone now */
805 acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS);
806 }
807 }
808 }
809
810 /*
811 * Thermal zone monitor thread.
812 */
813 static void
814 acpi_tz_thread(void *arg)
815 {
816 device_t *devs;
817 int devcount, i;
818 int flags;
819 struct acpi_tz_softc **sc;
820
821 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
822
823 devs = NULL;
824 devcount = 0;
825 sc = NULL;
826
827 for (;;) {
828 /* If the number of devices has changed, re-evaluate. */
829 if (devclass_get_maxunit(acpi_tz_devclass) != devcount) {
830 if (devs != NULL) {
831 free(devs, M_TEMP);
832 free(sc, M_TEMP);
833 }
834 devclass_get_devices(acpi_tz_devclass, &devs, &devcount);
835 sc = malloc(sizeof(struct acpi_tz_softc *) * devcount, M_TEMP,
836 M_WAITOK | M_ZERO);
837 for (i = 0; i < devcount; i++)
838 sc[i] = device_get_softc(devs[i]);
839 }
840
841 /* Check for temperature events and act on them. */
842 for (i = 0; i < devcount; i++) {
843 ACPI_LOCK(thermal);
844 flags = sc[i]->tz_flags;
845 sc[i]->tz_flags &= TZ_FLAG_NO_SCP;
846 ACPI_UNLOCK(thermal);
847 acpi_tz_timeout(sc[i], flags);
848 }
849
850 /* If more work to do, don't go to sleep yet. */
851 ACPI_LOCK(thermal);
852 for (i = 0; i < devcount; i++) {
853 if (sc[i]->tz_flags & ~TZ_FLAG_NO_SCP)
854 break;
855 }
856
857 /*
858 * If we have no more work, sleep for a while, setting PDROP so that
859 * the mutex will not be reacquired. Otherwise, drop the mutex and
860 * loop to handle more events.
861 */
862 if (i == devcount)
863 msleep(&acpi_tz_proc, &thermal_mutex, PZERO | PDROP, "tzpoll",
864 hz * acpi_tz_polling_rate);
865 else
866 ACPI_UNLOCK(thermal);
867 }
868 }
869
870 static int
871 acpi_tz_cpufreq_restore(struct acpi_tz_softc *sc)
872 {
873 device_t dev;
874 int error;
875
876 if (!sc->tz_cooling_updated)
877 return (0);
878 if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL)
879 return (ENXIO);
880 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
881 "temperature %d.%dC: resuming previous clock speed (%d MHz)\n",
882 TZ_KELVTOC(sc->tz_temperature), sc->tz_cooling_saved_freq);
883 error = CPUFREQ_SET(dev, NULL, CPUFREQ_PRIO_KERN);
884 if (error == 0)
885 sc->tz_cooling_updated = FALSE;
886 return (error);
887 }
888
889 static int
890 acpi_tz_cpufreq_update(struct acpi_tz_softc *sc, int req)
891 {
892 device_t dev;
893 struct cf_level *levels;
894 int num_levels, error, freq, desired_freq, perf, i;
895
896 levels = malloc(CPUFREQ_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT);
897 if (levels == NULL)
898 return (ENOMEM);
899
900 /*
901 * Find the main device, cpufreq0. We don't yet support independent
902 * CPU frequency control on SMP.
903 */
904 if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL) {
905 error = ENXIO;
906 goto out;
907 }
908
909 /* Get the current frequency. */
910 error = CPUFREQ_GET(dev, &levels[0]);
911 if (error)
912 goto out;
913 freq = levels[0].total_set.freq;
914
915 /* Get the current available frequency levels. */
916 num_levels = CPUFREQ_MAX_LEVELS;
917 error = CPUFREQ_LEVELS(dev, levels, &num_levels);
918 if (error) {
919 if (error == E2BIG)
920 printf("cpufreq: need to increase CPUFREQ_MAX_LEVELS\n");
921 goto out;
922 }
923
924 /* Calculate the desired frequency as a percent of the max frequency. */
925 perf = 100 * freq / levels[0].total_set.freq - req;
926 if (perf < 0)
927 perf = 0;
928 else if (perf > 100)
929 perf = 100;
930 desired_freq = levels[0].total_set.freq * perf / 100;
931
932 if (desired_freq < freq) {
933 /* Find the closest available frequency, rounding down. */
934 for (i = 0; i < num_levels; i++)
935 if (levels[i].total_set.freq <= desired_freq)
936 break;
937
938 /* If we didn't find a relevant setting, use the lowest. */
939 if (i == num_levels)
940 i--;
941 } else {
942 /* If we didn't decrease frequency yet, don't increase it. */
943 if (!sc->tz_cooling_updated) {
944 sc->tz_cooling_active = FALSE;
945 goto out;
946 }
947
948 /* Use saved cpu frequency as maximum value. */
949 if (desired_freq > sc->tz_cooling_saved_freq)
950 desired_freq = sc->tz_cooling_saved_freq;
951
952 /* Find the closest available frequency, rounding up. */
953 for (i = num_levels - 1; i >= 0; i--)
954 if (levels[i].total_set.freq >= desired_freq)
955 break;
956
957 /* If we didn't find a relevant setting, use the highest. */
958 if (i == -1)
959 i++;
960
961 /* If we're going to the highest frequency, restore the old setting. */
962 if (i == 0 || desired_freq == sc->tz_cooling_saved_freq) {
963 error = acpi_tz_cpufreq_restore(sc);
964 if (error == 0)
965 sc->tz_cooling_active = FALSE;
966 goto out;
967 }
968 }
969
970 /* If we are going to a new frequency, activate it. */
971 if (levels[i].total_set.freq != freq) {
972 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
973 "temperature %d.%dC: %screasing clock speed "
974 "from %d MHz to %d MHz\n",
975 TZ_KELVTOC(sc->tz_temperature),
976 (freq > levels[i].total_set.freq) ? "de" : "in",
977 freq, levels[i].total_set.freq);
978 error = CPUFREQ_SET(dev, &levels[i], CPUFREQ_PRIO_KERN);
979 if (error == 0 && !sc->tz_cooling_updated) {
980 sc->tz_cooling_saved_freq = freq;
981 sc->tz_cooling_updated = TRUE;
982 }
983 }
984
985 out:
986 if (levels)
987 free(levels, M_TEMP);
988 return (error);
989 }
990
991 /*
992 * Passive cooling thread; monitors current temperature according to the
993 * cooling interval and calculates whether to scale back CPU frequency.
994 */
995 static void
996 acpi_tz_cooling_thread(void *arg)
997 {
998 struct acpi_tz_softc *sc;
999 int error, perf, curr_temp, prev_temp;
1000
1001 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
1002
1003 sc = (struct acpi_tz_softc *)arg;
1004
1005 prev_temp = sc->tz_temperature;
1006 while (sc->tz_cooling_enabled) {
1007 if (sc->tz_cooling_active)
1008 (void)acpi_tz_get_temperature(sc);
1009 curr_temp = sc->tz_temperature;
1010 if (curr_temp >= sc->tz_zone.psv)
1011 sc->tz_cooling_active = TRUE;
1012 if (sc->tz_cooling_active) {
1013 perf = sc->tz_zone.tc1 * (curr_temp - prev_temp) +
1014 sc->tz_zone.tc2 * (curr_temp - sc->tz_zone.psv);
1015 perf /= 10;
1016
1017 if (perf != 0) {
1018 error = acpi_tz_cpufreq_update(sc, perf);
1019
1020 /*
1021 * If error and not simply a higher priority setting was
1022 * active, disable cooling.
1023 */
1024 if (error != 0 && error != EPERM) {
1025 device_printf(sc->tz_dev,
1026 "failed to set new freq, disabling passive cooling\n");
1027 sc->tz_cooling_enabled = FALSE;
1028 }
1029 }
1030 }
1031 prev_temp = curr_temp;
1032 tsleep(&sc->tz_cooling_proc, PZERO, "cooling",
1033 hz * sc->tz_zone.tsp / 10);
1034 }
1035 if (sc->tz_cooling_active) {
1036 acpi_tz_cpufreq_restore(sc);
1037 sc->tz_cooling_active = FALSE;
1038 }
1039 sc->tz_cooling_proc = NULL;
1040 ACPI_LOCK(thermal);
1041 sc->tz_cooling_proc_running = FALSE;
1042 ACPI_UNLOCK(thermal);
1043 kthread_exit(0);
1044 }
1045
1046 /*
1047 * TODO: We ignore _PSL (list of cooling devices) since cpufreq enumerates
1048 * all CPUs for us. However, it's possible in the future _PSL will
1049 * reference non-CPU devices so we may want to support it then.
1050 */
1051 static int
1052 acpi_tz_cooling_is_available(struct acpi_tz_softc *sc)
1053 {
1054 return (sc->tz_zone.tc1 != -1 && sc->tz_zone.tc2 != -1 &&
1055 sc->tz_zone.tsp != -1 && sc->tz_zone.tsp != 0 &&
1056 sc->tz_zone.psv != -1);
1057 }
1058
1059 static int
1060 acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc)
1061 {
1062 int error;
1063 char name[16];
1064
1065 ACPI_LOCK(thermal);
1066 if (sc->tz_cooling_proc_running) {
1067 ACPI_UNLOCK(thermal);
1068 return (0);
1069 }
1070 sc->tz_cooling_proc_running = TRUE;
1071 ACPI_UNLOCK(thermal);
1072 error = 0;
1073 if (sc->tz_cooling_proc == NULL) {
1074 snprintf(name, sizeof(name), "acpi_cooling%d",
1075 device_get_unit(sc->tz_dev));
1076 error = kthread_create(acpi_tz_cooling_thread, sc,
1077 &sc->tz_cooling_proc, RFHIGHPID, 0, name);
1078 if (error != 0) {
1079 device_printf(sc->tz_dev, "could not create thread - %d", error);
1080 ACPI_LOCK(thermal);
1081 sc->tz_cooling_proc_running = FALSE;
1082 ACPI_UNLOCK(thermal);
1083 }
1084 }
1085 return (error);
1086 }
Cache object: b80f17262f437a5b9a00ce834d9eae74
|