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 #include "opt_acpi.h"
30 #include <sys/param.h>
31 #include <sys/eventhandler.h>
32 #include <sys/kernel.h>
33 #include <sys/bus.h>
34 #include <sys/cpu.h>
35 #include <sys/kthread.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
38 #include <sys/proc.h>
39 #include <sys/reboot.h>
40 #include <sys/sysctl.h>
41 #include <sys/unistd.h>
42 #include <sys/power.h>
43
44 #include "cpufreq_if.h"
45
46 #include <contrib/dev/acpica/include/acpi.h>
47 #include <contrib/dev/acpica/include/accommon.h>
48
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 2731
56 #define TZ_KELVTOC(x) (((x) - TZ_ZEROC) / 10), abs(((x) - TZ_ZEROC) % 10)
57
58 #define TZ_NOTIFY_TEMPERATURE 0x80 /* Temperature changed. */
59 #define TZ_NOTIFY_LEVELS 0x81 /* Cooling levels changed. */
60 #define TZ_NOTIFY_DEVICES 0x82 /* Device lists changed. */
61 #define TZ_NOTIFY_CRITICAL 0xcc /* Fake notify that _CRT/_HOT/_CR3 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 int cr3;
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_CR3 (1<<2)
100 #define TZ_THFLAG_HOT (1<<3)
101 #define TZ_THFLAG_CRT (1<<4)
102 int tz_flags;
103 #define TZ_FLAG_NO_SCP (1<<0) /*No _SCP method*/
104 #define TZ_FLAG_GETPROFILE (1<<1) /*Get power_profile in timeout*/
105 #define TZ_FLAG_GETSETTINGS (1<<2) /*Get devs/setpoints*/
106 struct timespec tz_cooling_started;
107 /*Current cooling starting time*/
108
109 struct sysctl_ctx_list tz_sysctl_ctx;
110 struct sysctl_oid *tz_sysctl_tree;
111 eventhandler_tag tz_event;
112
113 struct acpi_tz_zone tz_zone; /*Thermal zone parameters*/
114 int tz_validchecks;
115 int tz_insane_tmp_notified;
116
117 /* passive cooling */
118 struct proc *tz_cooling_proc;
119 int tz_cooling_proc_running;
120 int tz_cooling_enabled;
121 int tz_cooling_active;
122 int tz_cooling_updated;
123 int tz_cooling_saved_freq;
124 };
125
126 #define TZ_ACTIVE_LEVEL(act) ((act) >= 0 ? (act) : TZ_NUMLEVELS)
127
128 #define CPUFREQ_MAX_LEVELS 64 /* XXX cpufreq should export this */
129
130 static int acpi_tz_probe(device_t dev);
131 static int acpi_tz_attach(device_t dev);
132 static int acpi_tz_establish(struct acpi_tz_softc *sc);
133 static void acpi_tz_monitor(void *Context);
134 static void acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg);
135 static void acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg);
136 static void acpi_tz_getparam(struct acpi_tz_softc *sc, char *node,
137 int *data);
138 static void acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what);
139 static int acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS);
140 static int acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS);
141 static int acpi_tz_temp_sysctl(SYSCTL_HANDLER_ARGS);
142 static int acpi_tz_passive_sysctl(SYSCTL_HANDLER_ARGS);
143 static void acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify,
144 void *context);
145 static void acpi_tz_signal(struct acpi_tz_softc *sc, int flags);
146 static void acpi_tz_timeout(struct acpi_tz_softc *sc, int flags);
147 static void acpi_tz_power_profile(void *arg);
148 static void acpi_tz_thread(void *arg);
149 static int acpi_tz_cooling_is_available(struct acpi_tz_softc *sc);
150 static int acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc);
151
152 static device_method_t acpi_tz_methods[] = {
153 /* Device interface */
154 DEVMETHOD(device_probe, acpi_tz_probe),
155 DEVMETHOD(device_attach, acpi_tz_attach),
156
157 DEVMETHOD_END
158 };
159
160 static driver_t acpi_tz_driver = {
161 "acpi_tz",
162 acpi_tz_methods,
163 sizeof(struct acpi_tz_softc),
164 };
165
166 static char *acpi_tz_tmp_name = "_TMP";
167
168 DRIVER_MODULE(acpi_tz, acpi, acpi_tz_driver, 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 /* Thermal zone 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
acpi_tz_probe(device_t dev)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
acpi_tz_attach(device_t dev)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[16];
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), OID_AUTO, "thermal",
244 CTLFLAG_RD | CTLFLAG_MPSAFE, 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 snprintf(oidname, sizeof(oidname), "tz%d", device_get_unit(dev));
261 sc->tz_sysctl_tree = SYSCTL_ADD_NODE_WITH_LABEL(&sc->tz_sysctl_ctx,
262 SYSCTL_CHILDREN(acpi_tz_sysctl_tree), OID_AUTO, oidname,
263 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "", "thermal_zone");
264 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
265 OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
266 &sc->tz_temperature, 0, sysctl_handle_int, "IK",
267 "current thermal zone temperature");
268 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
269 OID_AUTO, "active", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc,
270 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",
273 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc, 0,
274 acpi_tz_cooling_sysctl, "I",
275 "enable passive (speed reduction) cooling");
276
277 SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
278 OID_AUTO, "thermal_flags", CTLFLAG_RD,
279 &sc->tz_thflags, 0, "thermal zone flags");
280 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
281 OID_AUTO, "_PSV", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc,
282 offsetof(struct acpi_tz_softc, tz_zone.psv), acpi_tz_temp_sysctl, "IK",
283 "passive cooling temp setpoint");
284 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
285 OID_AUTO, "_CR3", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc,
286 offsetof(struct acpi_tz_softc, tz_zone.cr3), acpi_tz_temp_sysctl, "IK",
287 "too warm temp setpoint (standby now)");
288 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
289 OID_AUTO, "_HOT", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc,
290 offsetof(struct acpi_tz_softc, tz_zone.hot), acpi_tz_temp_sysctl, "IK",
291 "too hot temp setpoint (suspend now)");
292 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
293 OID_AUTO, "_CRT", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc,
294 offsetof(struct acpi_tz_softc, tz_zone.crt), acpi_tz_temp_sysctl, "IK",
295 "critical temp setpoint (shutdown now)");
296 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
297 OID_AUTO, "_ACx", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
298 &sc->tz_zone.ac, sizeof(sc->tz_zone.ac), sysctl_handle_opaque, "IK",
299 "");
300 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
301 OID_AUTO, "_TC1", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc,
302 offsetof(struct acpi_tz_softc, tz_zone.tc1), acpi_tz_passive_sysctl,
303 "I", "thermal constant 1 for passive cooling");
304 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
305 OID_AUTO, "_TC2", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc,
306 offsetof(struct acpi_tz_softc, tz_zone.tc2), acpi_tz_passive_sysctl,
307 "I", "thermal constant 2 for passive cooling");
308 SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
309 OID_AUTO, "_TSP", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc,
310 offsetof(struct acpi_tz_softc, tz_zone.tsp), acpi_tz_passive_sysctl,
311 "I", "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
acpi_tz_startup(void * arg __unused)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(devclass_find("acpi_tz"), &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
acpi_tz_establish(struct acpi_tz_softc * sc)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 acpi_tz_getparam(sc, "_CR3", &sc->tz_zone.cr3);
428 sc->tz_zone.psl.Length = ACPI_ALLOCATE_BUFFER;
429 sc->tz_zone.psl.Pointer = NULL;
430 AcpiEvaluateObject(sc->tz_handle, "_PSL", NULL, &sc->tz_zone.psl);
431 acpi_tz_getparam(sc, "_PSV", &sc->tz_zone.psv);
432 acpi_tz_getparam(sc, "_TC1", &sc->tz_zone.tc1);
433 acpi_tz_getparam(sc, "_TC2", &sc->tz_zone.tc2);
434 acpi_tz_getparam(sc, "_TSP", &sc->tz_zone.tsp);
435 acpi_tz_getparam(sc, "_TZP", &sc->tz_zone.tzp);
436
437 /*
438 * Sanity-check the values we've been given.
439 *
440 * XXX what do we do about systems that give us the same value for
441 * more than one of these setpoints?
442 */
443 acpi_tz_sanity(sc, &sc->tz_zone.crt, "_CRT");
444 acpi_tz_sanity(sc, &sc->tz_zone.hot, "_HOT");
445 acpi_tz_sanity(sc, &sc->tz_zone.cr3, "_CR3");
446 acpi_tz_sanity(sc, &sc->tz_zone.psv, "_PSV");
447 for (i = 0; i < TZ_NUMLEVELS; i++)
448 acpi_tz_sanity(sc, &sc->tz_zone.ac[i], "_ACx");
449
450 return_VALUE (0);
451 }
452
453 static char *aclevel_string[] = {
454 "NONE", "_AC0", "_AC1", "_AC2", "_AC3", "_AC4",
455 "_AC5", "_AC6", "_AC7", "_AC8", "_AC9"
456 };
457
458 static __inline const char *
acpi_tz_aclevel_string(int active)459 acpi_tz_aclevel_string(int active)
460 {
461 if (active < -1 || active >= TZ_NUMLEVELS)
462 return (aclevel_string[0]);
463
464 return (aclevel_string[active + 1]);
465 }
466
467 /*
468 * Get the current temperature.
469 */
470 static int
acpi_tz_get_temperature(struct acpi_tz_softc * sc)471 acpi_tz_get_temperature(struct acpi_tz_softc *sc)
472 {
473 int temp;
474 ACPI_STATUS status;
475
476 ACPI_FUNCTION_NAME ("acpi_tz_get_temperature");
477
478 /* Evaluate the thermal zone's _TMP method. */
479 status = acpi_GetInteger(sc->tz_handle, acpi_tz_tmp_name, &temp);
480 if (ACPI_FAILURE(status)) {
481 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
482 "error fetching current temperature -- %s\n",
483 AcpiFormatException(status));
484 return (FALSE);
485 }
486
487 /* Check it for validity. */
488 acpi_tz_sanity(sc, &temp, acpi_tz_tmp_name);
489 if (temp == -1)
490 return (FALSE);
491
492 ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "got %d.%dC\n", TZ_KELVTOC(temp)));
493 sc->tz_temperature = temp;
494 return (TRUE);
495 }
496
497 /*
498 * Evaluate the condition of a thermal zone, take appropriate actions.
499 */
500 static void
acpi_tz_monitor(void * Context)501 acpi_tz_monitor(void *Context)
502 {
503 struct acpi_softc *acpi_sc;
504 struct acpi_tz_softc *sc;
505 struct timespec curtime;
506 int temp;
507 int i;
508 int newactive, newflags;
509
510 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
511
512 sc = (struct acpi_tz_softc *)Context;
513
514 /* Get the current temperature. */
515 if (!acpi_tz_get_temperature(sc)) {
516 /* XXX disable zone? go to max cooling? */
517 return_VOID;
518 }
519 temp = sc->tz_temperature;
520
521 /*
522 * Work out what we ought to be doing right now.
523 *
524 * Note that the _ACx levels sort from hot to cold.
525 */
526 newactive = TZ_ACTIVE_NONE;
527 for (i = TZ_NUMLEVELS - 1; i >= 0; i--) {
528 if (sc->tz_zone.ac[i] != -1 && temp >= sc->tz_zone.ac[i])
529 newactive = i;
530 }
531
532 /*
533 * We are going to get _ACx level down (colder side), but give a guaranteed
534 * minimum cooling run time if requested.
535 */
536 if (acpi_tz_min_runtime > 0 && sc->tz_active != TZ_ACTIVE_NONE &&
537 sc->tz_active != TZ_ACTIVE_UNKNOWN &&
538 (newactive == TZ_ACTIVE_NONE || newactive > sc->tz_active)) {
539 getnanotime(&curtime);
540 timespecsub(&curtime, &sc->tz_cooling_started, &curtime);
541 if (curtime.tv_sec < acpi_tz_min_runtime)
542 newactive = sc->tz_active;
543 }
544
545 /* Handle user override of active mode */
546 if (sc->tz_requested != TZ_ACTIVE_NONE && (newactive == TZ_ACTIVE_NONE
547 || sc->tz_requested < newactive))
548 newactive = sc->tz_requested;
549
550 /* update temperature-related flags */
551 newflags = TZ_THFLAG_NONE;
552 if (sc->tz_zone.psv != -1 && temp >= sc->tz_zone.psv)
553 newflags |= TZ_THFLAG_PSV;
554 if (sc->tz_zone.cr3 != -1 && temp >= sc->tz_zone.cr3)
555 newflags |= TZ_THFLAG_CR3;
556 if (sc->tz_zone.hot != -1 && temp >= sc->tz_zone.hot)
557 newflags |= TZ_THFLAG_HOT;
558 if (sc->tz_zone.crt != -1 && temp >= sc->tz_zone.crt)
559 newflags |= TZ_THFLAG_CRT;
560
561 /* If the active cooling state has changed, we have to switch things. */
562 if (sc->tz_active == TZ_ACTIVE_UNKNOWN) {
563 /*
564 * We don't know which cooling device is on or off,
565 * so stop them all, because we now know which
566 * should be on (if any).
567 */
568 for (i = 0; i < TZ_NUMLEVELS; i++) {
569 if (sc->tz_zone.al[i].Pointer != NULL) {
570 acpi_ForeachPackageObject(
571 (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
572 acpi_tz_switch_cooler_off, sc);
573 }
574 }
575 /* now we know that all devices are off */
576 sc->tz_active = TZ_ACTIVE_NONE;
577 }
578
579 if (newactive != sc->tz_active) {
580 /* Turn off unneeded cooling devices that are on, if any are */
581 for (i = TZ_ACTIVE_LEVEL(sc->tz_active);
582 i < TZ_ACTIVE_LEVEL(newactive); i++) {
583 acpi_ForeachPackageObject(
584 (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
585 acpi_tz_switch_cooler_off, sc);
586 }
587 /* Turn on cooling devices that are required, if any are */
588 for (i = TZ_ACTIVE_LEVEL(sc->tz_active) - 1;
589 i >= TZ_ACTIVE_LEVEL(newactive); i--) {
590 acpi_ForeachPackageObject(
591 (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
592 acpi_tz_switch_cooler_on, sc);
593 }
594
595 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
596 "switched from %s to %s: %d.%dC\n",
597 acpi_tz_aclevel_string(sc->tz_active),
598 acpi_tz_aclevel_string(newactive), TZ_KELVTOC(temp));
599 sc->tz_active = newactive;
600 getnanotime(&sc->tz_cooling_started);
601 }
602
603 /* XXX (de)activate any passive cooling that may be required. */
604
605 /*
606 * If the temperature is at _HOT or _CRT, increment our event count.
607 * If it has occurred enough times, shutdown the system. This is
608 * needed because some systems will report an invalid high temperature
609 * for one poll cycle. It is suspected this is due to the embedded
610 * controller timing out. A typical value is 138C for one cycle on
611 * a system that is otherwise 65C.
612 *
613 * If we're almost at that threshold, notify the user through devd(8).
614 */
615 if ((newflags & (TZ_THFLAG_CR3 | TZ_THFLAG_HOT | TZ_THFLAG_CRT)) != 0) {
616 sc->tz_validchecks++;
617 if (sc->tz_validchecks == TZ_VALIDCHECKS) {
618 device_printf(sc->tz_dev,
619 "WARNING - current temperature (%d.%dC) exceeds safe limits\n",
620 TZ_KELVTOC(sc->tz_temperature));
621 if ((newflags & (TZ_THFLAG_HOT | TZ_THFLAG_CRT)) != 0)
622 shutdown_nice(RB_POWEROFF);
623 else {
624 acpi_sc = acpi_device_get_parent_softc(sc->tz_dev);
625 acpi_ReqSleepState(acpi_sc, ACPI_STATE_S3);
626 }
627 } else if (sc->tz_validchecks == TZ_NOTIFYCOUNT)
628 acpi_UserNotify("Thermal", sc->tz_handle, TZ_NOTIFY_CRITICAL);
629 } else {
630 sc->tz_validchecks = 0;
631 }
632 sc->tz_thflags = newflags;
633
634 return_VOID;
635 }
636
637 /*
638 * Given an object, verify that it's a reference to a device of some sort,
639 * and try to switch it off.
640 */
641 static void
acpi_tz_switch_cooler_off(ACPI_OBJECT * obj,void * arg)642 acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg)
643 {
644 ACPI_HANDLE cooler;
645
646 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
647
648 cooler = acpi_GetReference(NULL, obj);
649 if (cooler == NULL) {
650 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n"));
651 return_VOID;
652 }
653
654 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s off\n",
655 acpi_name(cooler)));
656 acpi_pwr_switch_consumer(cooler, ACPI_STATE_D3);
657
658 return_VOID;
659 }
660
661 /*
662 * Given an object, verify that it's a reference to a device of some sort,
663 * and try to switch it on.
664 *
665 * XXX replication of off/on function code is bad.
666 */
667 static void
acpi_tz_switch_cooler_on(ACPI_OBJECT * obj,void * arg)668 acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg)
669 {
670 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg;
671 ACPI_HANDLE cooler;
672 ACPI_STATUS status;
673
674 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
675
676 cooler = acpi_GetReference(NULL, obj);
677 if (cooler == NULL) {
678 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n"));
679 return_VOID;
680 }
681
682 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s on\n",
683 acpi_name(cooler)));
684 status = acpi_pwr_switch_consumer(cooler, ACPI_STATE_D0);
685 if (ACPI_FAILURE(status)) {
686 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
687 "failed to activate %s - %s\n", acpi_name(cooler),
688 AcpiFormatException(status));
689 }
690
691 return_VOID;
692 }
693
694 /*
695 * Read/debug-print a parameter, default it to -1.
696 */
697 static void
acpi_tz_getparam(struct acpi_tz_softc * sc,char * node,int * data)698 acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data)
699 {
700
701 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
702
703 if (ACPI_FAILURE(acpi_GetInteger(sc->tz_handle, node, data))) {
704 *data = -1;
705 } else {
706 ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "%s.%s = %d\n",
707 acpi_name(sc->tz_handle), node, *data));
708 }
709
710 return_VOID;
711 }
712
713 /*
714 * Sanity-check a temperature value. Assume that setpoints
715 * should be between 0C and 200C.
716 */
717 static void
acpi_tz_sanity(struct acpi_tz_softc * sc,int * val,char * what)718 acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what)
719 {
720 if (*val != -1 && (*val < TZ_ZEROC || *val > TZ_ZEROC + 2000)) {
721 /*
722 * If the value we are checking is _TMP, warn the user only
723 * once. This avoids spamming messages if, for instance, the
724 * sensor is broken and always returns an invalid temperature.
725 *
726 * This is only done for _TMP; other values always emit a
727 * warning.
728 */
729 if (what != acpi_tz_tmp_name || !sc->tz_insane_tmp_notified) {
730 device_printf(sc->tz_dev, "%s value is absurd, ignored (%d.%dC)\n",
731 what, TZ_KELVTOC(*val));
732
733 /* Don't warn the user again if the read value doesn't improve. */
734 if (what == acpi_tz_tmp_name)
735 sc->tz_insane_tmp_notified = 1;
736 }
737 *val = -1;
738 return;
739 }
740
741 /* This value is correct. Warn if it's incorrect again. */
742 if (what == acpi_tz_tmp_name)
743 sc->tz_insane_tmp_notified = 0;
744 }
745
746 /*
747 * Respond to a sysctl on the active state node.
748 */
749 static int
acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS)750 acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS)
751 {
752 struct acpi_tz_softc *sc;
753 int active;
754 int error;
755
756 sc = (struct acpi_tz_softc *)oidp->oid_arg1;
757 active = sc->tz_active;
758 error = sysctl_handle_int(oidp, &active, 0, req);
759
760 /* Error or no new value */
761 if (error != 0 || req->newptr == NULL)
762 return (error);
763 if (active < -1 || active >= TZ_NUMLEVELS)
764 return (EINVAL);
765
766 /* Set new preferred level and re-switch */
767 sc->tz_requested = active;
768 acpi_tz_signal(sc, 0);
769 return (0);
770 }
771
772 static int
acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS)773 acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS)
774 {
775 struct acpi_tz_softc *sc;
776 int enabled, error;
777
778 sc = (struct acpi_tz_softc *)oidp->oid_arg1;
779 enabled = sc->tz_cooling_enabled;
780 error = sysctl_handle_int(oidp, &enabled, 0, req);
781
782 /* Error or no new value */
783 if (error != 0 || req->newptr == NULL)
784 return (error);
785 if (enabled != TRUE && enabled != FALSE)
786 return (EINVAL);
787
788 if (enabled) {
789 if (acpi_tz_cooling_is_available(sc))
790 error = acpi_tz_cooling_thread_start(sc);
791 else
792 error = ENODEV;
793 if (error)
794 enabled = FALSE;
795 }
796 sc->tz_cooling_enabled = enabled;
797 return (error);
798 }
799
800 static int
acpi_tz_temp_sysctl(SYSCTL_HANDLER_ARGS)801 acpi_tz_temp_sysctl(SYSCTL_HANDLER_ARGS)
802 {
803 struct acpi_tz_softc *sc;
804 int temp, *temp_ptr;
805 int error;
806
807 sc = oidp->oid_arg1;
808 temp_ptr = (int *)(void *)(uintptr_t)((uintptr_t)sc + oidp->oid_arg2);
809 temp = *temp_ptr;
810 error = sysctl_handle_int(oidp, &temp, 0, req);
811
812 /* Error or no new value */
813 if (error != 0 || req->newptr == NULL)
814 return (error);
815
816 /* Only allow changing settings if override is set. */
817 if (!acpi_tz_override)
818 return (EPERM);
819
820 /* Check user-supplied value for sanity. */
821 acpi_tz_sanity(sc, &temp, "user-supplied temp");
822 if (temp == -1)
823 return (EINVAL);
824
825 *temp_ptr = temp;
826 return (0);
827 }
828
829 static int
acpi_tz_passive_sysctl(SYSCTL_HANDLER_ARGS)830 acpi_tz_passive_sysctl(SYSCTL_HANDLER_ARGS)
831 {
832 struct acpi_tz_softc *sc;
833 int val, *val_ptr;
834 int error;
835
836 sc = oidp->oid_arg1;
837 val_ptr = (int *)(void *)(uintptr_t)((uintptr_t)sc + oidp->oid_arg2);
838 val = *val_ptr;
839 error = sysctl_handle_int(oidp, &val, 0, req);
840
841 /* Error or no new value */
842 if (error != 0 || req->newptr == NULL)
843 return (error);
844
845 /* Only allow changing settings if override is set. */
846 if (!acpi_tz_override)
847 return (EPERM);
848
849 *val_ptr = val;
850 return (0);
851 }
852
853 static void
acpi_tz_notify_handler(ACPI_HANDLE h,UINT32 notify,void * context)854 acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
855 {
856 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)context;
857
858 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
859
860 switch (notify) {
861 case TZ_NOTIFY_TEMPERATURE:
862 /* Temperature change occurred */
863 acpi_tz_signal(sc, 0);
864 break;
865 case TZ_NOTIFY_DEVICES:
866 case TZ_NOTIFY_LEVELS:
867 /* Zone devices/setpoints changed */
868 acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS);
869 break;
870 default:
871 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
872 "unknown Notify event 0x%x\n", notify);
873 break;
874 }
875
876 acpi_UserNotify("Thermal", h, notify);
877
878 return_VOID;
879 }
880
881 static void
acpi_tz_signal(struct acpi_tz_softc * sc,int flags)882 acpi_tz_signal(struct acpi_tz_softc *sc, int flags)
883 {
884 ACPI_LOCK(thermal);
885 sc->tz_flags |= flags;
886 ACPI_UNLOCK(thermal);
887 wakeup(&acpi_tz_proc);
888 }
889
890 /*
891 * Notifies can be generated asynchronously but have also been seen to be
892 * triggered by other thermal methods. One system generates a notify of
893 * 0x81 when the fan is turned on or off. Another generates it when _SCP
894 * is called. To handle these situations, we check the zone via
895 * acpi_tz_monitor() before evaluating changes to setpoints or the cooling
896 * policy.
897 */
898 static void
acpi_tz_timeout(struct acpi_tz_softc * sc,int flags)899 acpi_tz_timeout(struct acpi_tz_softc *sc, int flags)
900 {
901
902 /* Check the current temperature and take action based on it */
903 acpi_tz_monitor(sc);
904
905 /* If requested, get the power profile settings. */
906 if (flags & TZ_FLAG_GETPROFILE)
907 acpi_tz_power_profile(sc);
908
909 /*
910 * If requested, check for new devices/setpoints. After finding them,
911 * check if we need to switch fans based on the new values.
912 */
913 if (flags & TZ_FLAG_GETSETTINGS) {
914 acpi_tz_establish(sc);
915 acpi_tz_monitor(sc);
916 }
917
918 /* XXX passive cooling actions? */
919 }
920
921 /*
922 * System power profile may have changed; fetch and notify the
923 * thermal zone accordingly.
924 *
925 * Since this can be called from an arbitrary eventhandler, it needs
926 * to get the ACPI lock itself.
927 */
928 static void
acpi_tz_power_profile(void * arg)929 acpi_tz_power_profile(void *arg)
930 {
931 ACPI_STATUS status;
932 struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg;
933 int state;
934
935 state = power_profile_get_state();
936 if (state != POWER_PROFILE_PERFORMANCE && state != POWER_PROFILE_ECONOMY)
937 return;
938
939 /* check that we haven't decided there's no _SCP method */
940 if ((sc->tz_flags & TZ_FLAG_NO_SCP) == 0) {
941 /* Call _SCP to set the new profile */
942 status = acpi_SetInteger(sc->tz_handle, "_SCP",
943 (state == POWER_PROFILE_PERFORMANCE) ? 0 : 1);
944 if (ACPI_FAILURE(status)) {
945 if (status != AE_NOT_FOUND)
946 ACPI_VPRINT(sc->tz_dev,
947 acpi_device_get_parent_softc(sc->tz_dev),
948 "can't evaluate %s._SCP - %s\n",
949 acpi_name(sc->tz_handle),
950 AcpiFormatException(status));
951 sc->tz_flags |= TZ_FLAG_NO_SCP;
952 } else {
953 /* We have to re-evaluate the entire zone now */
954 acpi_tz_signal(sc, TZ_FLAG_GETSETTINGS);
955 }
956 }
957 }
958
959 /*
960 * Thermal zone monitor thread.
961 */
962 static void
acpi_tz_thread(void * arg)963 acpi_tz_thread(void *arg)
964 {
965 devclass_t acpi_tz_devclass;
966 device_t *devs;
967 int devcount, i;
968 int flags;
969 struct acpi_tz_softc **sc;
970
971 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
972
973 acpi_tz_devclass = devclass_find("acpi_tz");
974 devs = NULL;
975 devcount = 0;
976 sc = NULL;
977
978 for (;;) {
979 /* If the number of devices has changed, re-evaluate. */
980 if (devclass_get_count(acpi_tz_devclass) != devcount) {
981 if (devs != NULL) {
982 free(devs, M_TEMP);
983 free(sc, M_TEMP);
984 }
985 devclass_get_devices(acpi_tz_devclass, &devs, &devcount);
986 sc = malloc(sizeof(struct acpi_tz_softc *) * devcount, M_TEMP,
987 M_WAITOK | M_ZERO);
988 for (i = 0; i < devcount; i++)
989 sc[i] = device_get_softc(devs[i]);
990 }
991
992 /* Check for temperature events and act on them. */
993 for (i = 0; i < devcount; i++) {
994 ACPI_LOCK(thermal);
995 flags = sc[i]->tz_flags;
996 sc[i]->tz_flags &= TZ_FLAG_NO_SCP;
997 ACPI_UNLOCK(thermal);
998 acpi_tz_timeout(sc[i], flags);
999 }
1000
1001 /* If more work to do, don't go to sleep yet. */
1002 ACPI_LOCK(thermal);
1003 for (i = 0; i < devcount; i++) {
1004 if (sc[i]->tz_flags & ~TZ_FLAG_NO_SCP)
1005 break;
1006 }
1007
1008 /*
1009 * If we have no more work, sleep for a while, setting PDROP so that
1010 * the mutex will not be reacquired. Otherwise, drop the mutex and
1011 * loop to handle more events.
1012 */
1013 if (i == devcount)
1014 msleep(&acpi_tz_proc, &thermal_mutex, PZERO | PDROP, "tzpoll",
1015 hz * acpi_tz_polling_rate);
1016 else
1017 ACPI_UNLOCK(thermal);
1018 }
1019 }
1020
1021 static int
acpi_tz_cpufreq_restore(struct acpi_tz_softc * sc)1022 acpi_tz_cpufreq_restore(struct acpi_tz_softc *sc)
1023 {
1024 device_t dev;
1025 int error;
1026
1027 if (!sc->tz_cooling_updated)
1028 return (0);
1029 if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL)
1030 return (ENXIO);
1031 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
1032 "temperature %d.%dC: resuming previous clock speed (%d MHz)\n",
1033 TZ_KELVTOC(sc->tz_temperature), sc->tz_cooling_saved_freq);
1034 error = CPUFREQ_SET(dev, NULL, CPUFREQ_PRIO_KERN);
1035 if (error == 0)
1036 sc->tz_cooling_updated = FALSE;
1037 return (error);
1038 }
1039
1040 static int
acpi_tz_cpufreq_update(struct acpi_tz_softc * sc,int req)1041 acpi_tz_cpufreq_update(struct acpi_tz_softc *sc, int req)
1042 {
1043 device_t dev;
1044 struct cf_level *levels;
1045 int num_levels, error, freq, desired_freq, perf, i;
1046
1047 levels = malloc(CPUFREQ_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT);
1048 if (levels == NULL)
1049 return (ENOMEM);
1050
1051 /*
1052 * Find the main device, cpufreq0. We don't yet support independent
1053 * CPU frequency control on SMP.
1054 */
1055 if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL) {
1056 error = ENXIO;
1057 goto out;
1058 }
1059
1060 /* Get the current frequency. */
1061 error = CPUFREQ_GET(dev, &levels[0]);
1062 if (error)
1063 goto out;
1064 freq = levels[0].total_set.freq;
1065
1066 /* Get the current available frequency levels. */
1067 num_levels = CPUFREQ_MAX_LEVELS;
1068 error = CPUFREQ_LEVELS(dev, levels, &num_levels);
1069 if (error) {
1070 if (error == E2BIG)
1071 printf("cpufreq: need to increase CPUFREQ_MAX_LEVELS\n");
1072 goto out;
1073 }
1074
1075 /* Calculate the desired frequency as a percent of the max frequency. */
1076 perf = 100 * freq / levels[0].total_set.freq - req;
1077 if (perf < 0)
1078 perf = 0;
1079 else if (perf > 100)
1080 perf = 100;
1081 desired_freq = levels[0].total_set.freq * perf / 100;
1082
1083 if (desired_freq < freq) {
1084 /* Find the closest available frequency, rounding down. */
1085 for (i = 0; i < num_levels; i++)
1086 if (levels[i].total_set.freq <= desired_freq)
1087 break;
1088
1089 /* If we didn't find a relevant setting, use the lowest. */
1090 if (i == num_levels)
1091 i--;
1092 } else {
1093 /* If we didn't decrease frequency yet, don't increase it. */
1094 if (!sc->tz_cooling_updated) {
1095 sc->tz_cooling_active = FALSE;
1096 goto out;
1097 }
1098
1099 /* Use saved cpu frequency as maximum value. */
1100 if (desired_freq > sc->tz_cooling_saved_freq)
1101 desired_freq = sc->tz_cooling_saved_freq;
1102
1103 /* Find the closest available frequency, rounding up. */
1104 for (i = num_levels - 1; i >= 0; i--)
1105 if (levels[i].total_set.freq >= desired_freq)
1106 break;
1107
1108 /* If we didn't find a relevant setting, use the highest. */
1109 if (i == -1)
1110 i++;
1111
1112 /* If we're going to the highest frequency, restore the old setting. */
1113 if (i == 0 || desired_freq == sc->tz_cooling_saved_freq) {
1114 error = acpi_tz_cpufreq_restore(sc);
1115 if (error == 0)
1116 sc->tz_cooling_active = FALSE;
1117 goto out;
1118 }
1119 }
1120
1121 /* If we are going to a new frequency, activate it. */
1122 if (levels[i].total_set.freq != freq) {
1123 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
1124 "temperature %d.%dC: %screasing clock speed "
1125 "from %d MHz to %d MHz\n",
1126 TZ_KELVTOC(sc->tz_temperature),
1127 (freq > levels[i].total_set.freq) ? "de" : "in",
1128 freq, levels[i].total_set.freq);
1129 error = CPUFREQ_SET(dev, &levels[i], CPUFREQ_PRIO_KERN);
1130 if (error == 0 && !sc->tz_cooling_updated) {
1131 sc->tz_cooling_saved_freq = freq;
1132 sc->tz_cooling_updated = TRUE;
1133 }
1134 }
1135
1136 out:
1137 if (levels)
1138 free(levels, M_TEMP);
1139 return (error);
1140 }
1141
1142 /*
1143 * Passive cooling thread; monitors current temperature according to the
1144 * cooling interval and calculates whether to scale back CPU frequency.
1145 */
1146 static void
acpi_tz_cooling_thread(void * arg)1147 acpi_tz_cooling_thread(void *arg)
1148 {
1149 struct acpi_tz_softc *sc;
1150 int error, perf, curr_temp, prev_temp;
1151
1152 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
1153
1154 sc = (struct acpi_tz_softc *)arg;
1155
1156 prev_temp = sc->tz_temperature;
1157 while (sc->tz_cooling_enabled) {
1158 if (sc->tz_cooling_active)
1159 (void)acpi_tz_get_temperature(sc);
1160 curr_temp = sc->tz_temperature;
1161 if (curr_temp >= sc->tz_zone.psv)
1162 sc->tz_cooling_active = TRUE;
1163 if (sc->tz_cooling_active) {
1164 perf = sc->tz_zone.tc1 * (curr_temp - prev_temp) +
1165 sc->tz_zone.tc2 * (curr_temp - sc->tz_zone.psv);
1166 perf /= 10;
1167
1168 if (perf != 0) {
1169 error = acpi_tz_cpufreq_update(sc, perf);
1170
1171 /*
1172 * If error and not simply a higher priority setting was
1173 * active, disable cooling.
1174 */
1175 if (error != 0 && error != EPERM) {
1176 device_printf(sc->tz_dev,
1177 "failed to set new freq, disabling passive cooling\n");
1178 sc->tz_cooling_enabled = FALSE;
1179 }
1180 }
1181 }
1182 prev_temp = curr_temp;
1183 tsleep(&sc->tz_cooling_proc, PZERO, "cooling",
1184 hz * sc->tz_zone.tsp / 10);
1185 }
1186 if (sc->tz_cooling_active) {
1187 acpi_tz_cpufreq_restore(sc);
1188 sc->tz_cooling_active = FALSE;
1189 }
1190 sc->tz_cooling_proc = NULL;
1191 ACPI_LOCK(thermal);
1192 sc->tz_cooling_proc_running = FALSE;
1193 ACPI_UNLOCK(thermal);
1194 kproc_exit(0);
1195 }
1196
1197 /*
1198 * TODO: We ignore _PSL (list of cooling devices) since cpufreq enumerates
1199 * all CPUs for us. However, it's possible in the future _PSL will
1200 * reference non-CPU devices so we may want to support it then.
1201 */
1202 static int
acpi_tz_cooling_is_available(struct acpi_tz_softc * sc)1203 acpi_tz_cooling_is_available(struct acpi_tz_softc *sc)
1204 {
1205 return (sc->tz_zone.tc1 != -1 && sc->tz_zone.tc2 != -1 &&
1206 sc->tz_zone.tsp != -1 && sc->tz_zone.tsp != 0 &&
1207 sc->tz_zone.psv != -1);
1208 }
1209
1210 static int
acpi_tz_cooling_thread_start(struct acpi_tz_softc * sc)1211 acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc)
1212 {
1213 int error;
1214
1215 ACPI_LOCK(thermal);
1216 if (sc->tz_cooling_proc_running) {
1217 ACPI_UNLOCK(thermal);
1218 return (0);
1219 }
1220 sc->tz_cooling_proc_running = TRUE;
1221 ACPI_UNLOCK(thermal);
1222 error = 0;
1223 if (sc->tz_cooling_proc == NULL) {
1224 error = kproc_create(acpi_tz_cooling_thread, sc,
1225 &sc->tz_cooling_proc, RFHIGHPID, 0, "acpi_cooling%d",
1226 device_get_unit(sc->tz_dev));
1227 if (error != 0) {
1228 device_printf(sc->tz_dev, "could not create thread - %d", error);
1229 ACPI_LOCK(thermal);
1230 sc->tz_cooling_proc_running = FALSE;
1231 ACPI_UNLOCK(thermal);
1232 }
1233 }
1234 return (error);
1235 }
1236