Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * processor_idle - idle state submodule to the ACPI processor driver | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> | |
7 | * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> | |
8 | * - Added processor hotplug support | |
02df8b93 VP |
9 | * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> |
10 | * - Added support for C3 on SMP | |
1da177e4 LT |
11 | * |
12 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or (at | |
17 | * your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, but | |
20 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
22 | * General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License along | |
25 | * with this program; if not, write to the Free Software Foundation, Inc., | |
26 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
27 | * | |
28 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
29 | */ | |
30 | ||
31 | #include <linux/kernel.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/cpufreq.h> | |
35 | #include <linux/proc_fs.h> | |
36 | #include <linux/seq_file.h> | |
37 | #include <linux/acpi.h> | |
38 | #include <linux/dmi.h> | |
39 | #include <linux/moduleparam.h> | |
4e57b681 | 40 | #include <linux/sched.h> /* need_resched() */ |
1da177e4 LT |
41 | |
42 | #include <asm/io.h> | |
43 | #include <asm/uaccess.h> | |
44 | ||
45 | #include <acpi/acpi_bus.h> | |
46 | #include <acpi/processor.h> | |
47 | ||
48 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 | |
49 | #define ACPI_PROCESSOR_CLASS "processor" | |
50 | #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" | |
51 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
4be44fcd | 52 | ACPI_MODULE_NAME("acpi_processor") |
1da177e4 | 53 | #define ACPI_PROCESSOR_FILE_POWER "power" |
1da177e4 LT |
54 | #define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000) |
55 | #define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */ | |
56 | #define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */ | |
4be44fcd | 57 | static void (*pm_idle_save) (void); |
1da177e4 LT |
58 | module_param(max_cstate, uint, 0644); |
59 | ||
60 | static unsigned int nocst = 0; | |
61 | module_param(nocst, uint, 0000); | |
62 | ||
63 | /* | |
64 | * bm_history -- bit-mask with a bit per jiffy of bus-master activity | |
65 | * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms | |
66 | * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms | |
67 | * 100 HZ: 0x0000000F: 4 jiffies = 40ms | |
68 | * reduce history for more aggressive entry into C3 | |
69 | */ | |
4be44fcd LB |
70 | static unsigned int bm_history = |
71 | (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1)); | |
1da177e4 LT |
72 | module_param(bm_history, uint, 0644); |
73 | /* -------------------------------------------------------------------------- | |
74 | Power Management | |
75 | -------------------------------------------------------------------------- */ | |
76 | ||
77 | /* | |
78 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. | |
79 | * For now disable this. Probably a bug somewhere else. | |
80 | * | |
81 | * To skip this limit, boot/load with a large max_cstate limit. | |
82 | */ | |
335f16be | 83 | static int set_max_cstate(struct dmi_system_id *id) |
1da177e4 LT |
84 | { |
85 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) | |
86 | return 0; | |
87 | ||
3d35600a | 88 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
4be44fcd LB |
89 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
90 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); | |
1da177e4 | 91 | |
3d35600a | 92 | max_cstate = (long)id->driver_data; |
1da177e4 LT |
93 | |
94 | return 0; | |
95 | } | |
96 | ||
1da177e4 | 97 | static struct dmi_system_id __initdata processor_power_dmi_table[] = { |
4be44fcd LB |
98 | {set_max_cstate, "IBM ThinkPad R40e", { |
99 | DMI_MATCH(DMI_BIOS_VENDOR, | |
100 | "IBM"), | |
101 | DMI_MATCH(DMI_BIOS_VERSION, | |
102 | "1SET60WW")}, | |
103 | (void *)1}, | |
104 | {set_max_cstate, "Medion 41700", { | |
105 | DMI_MATCH(DMI_BIOS_VENDOR, | |
106 | "Phoenix Technologies LTD"), | |
107 | DMI_MATCH(DMI_BIOS_VERSION, | |
108 | "R01-A1J")}, (void *)1}, | |
109 | {set_max_cstate, "Clevo 5600D", { | |
110 | DMI_MATCH(DMI_BIOS_VENDOR, | |
111 | "Phoenix Technologies LTD"), | |
112 | DMI_MATCH(DMI_BIOS_VERSION, | |
113 | "SHE845M0.86C.0013.D.0302131307")}, | |
114 | (void *)2}, | |
1da177e4 LT |
115 | {}, |
116 | }; | |
117 | ||
4be44fcd | 118 | static inline u32 ticks_elapsed(u32 t1, u32 t2) |
1da177e4 LT |
119 | { |
120 | if (t2 >= t1) | |
121 | return (t2 - t1); | |
122 | else if (!acpi_fadt.tmr_val_ext) | |
123 | return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); | |
124 | else | |
125 | return ((0xFFFFFFFF - t1) + t2); | |
126 | } | |
127 | ||
1da177e4 | 128 | static void |
4be44fcd LB |
129 | acpi_processor_power_activate(struct acpi_processor *pr, |
130 | struct acpi_processor_cx *new) | |
1da177e4 | 131 | { |
4be44fcd | 132 | struct acpi_processor_cx *old; |
1da177e4 LT |
133 | |
134 | if (!pr || !new) | |
135 | return; | |
136 | ||
137 | old = pr->power.state; | |
138 | ||
139 | if (old) | |
140 | old->promotion.count = 0; | |
4be44fcd | 141 | new->demotion.count = 0; |
1da177e4 LT |
142 | |
143 | /* Cleanup from old state. */ | |
144 | if (old) { | |
145 | switch (old->type) { | |
146 | case ACPI_STATE_C3: | |
147 | /* Disable bus master reload */ | |
02df8b93 | 148 | if (new->type != ACPI_STATE_C3 && pr->flags.bm_check) |
4be44fcd LB |
149 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0, |
150 | ACPI_MTX_DO_NOT_LOCK); | |
1da177e4 LT |
151 | break; |
152 | } | |
153 | } | |
154 | ||
155 | /* Prepare to use new state. */ | |
156 | switch (new->type) { | |
157 | case ACPI_STATE_C3: | |
158 | /* Enable bus master reload */ | |
02df8b93 | 159 | if (old->type != ACPI_STATE_C3 && pr->flags.bm_check) |
4be44fcd LB |
160 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1, |
161 | ACPI_MTX_DO_NOT_LOCK); | |
1da177e4 LT |
162 | break; |
163 | } | |
164 | ||
165 | pr->power.state = new; | |
166 | ||
167 | return; | |
168 | } | |
169 | ||
64c7c8f8 NP |
170 | static void acpi_safe_halt(void) |
171 | { | |
172 | int polling = test_thread_flag(TIF_POLLING_NRFLAG); | |
173 | if (polling) { | |
174 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
175 | smp_mb__after_clear_bit(); | |
176 | } | |
177 | if (!need_resched()) | |
178 | safe_halt(); | |
179 | if (polling) | |
180 | set_thread_flag(TIF_POLLING_NRFLAG); | |
181 | } | |
182 | ||
4be44fcd | 183 | static atomic_t c3_cpu_count; |
1da177e4 | 184 | |
4be44fcd | 185 | static void acpi_processor_idle(void) |
1da177e4 | 186 | { |
4be44fcd | 187 | struct acpi_processor *pr = NULL; |
1da177e4 LT |
188 | struct acpi_processor_cx *cx = NULL; |
189 | struct acpi_processor_cx *next_state = NULL; | |
4be44fcd LB |
190 | int sleep_ticks = 0; |
191 | u32 t1, t2 = 0; | |
1da177e4 | 192 | |
64c7c8f8 | 193 | pr = processors[smp_processor_id()]; |
1da177e4 LT |
194 | if (!pr) |
195 | return; | |
196 | ||
197 | /* | |
198 | * Interrupts must be disabled during bus mastering calculations and | |
199 | * for C2/C3 transitions. | |
200 | */ | |
201 | local_irq_disable(); | |
202 | ||
203 | /* | |
204 | * Check whether we truly need to go idle, or should | |
205 | * reschedule: | |
206 | */ | |
207 | if (unlikely(need_resched())) { | |
208 | local_irq_enable(); | |
209 | return; | |
210 | } | |
211 | ||
212 | cx = pr->power.state; | |
64c7c8f8 NP |
213 | if (!cx) { |
214 | if (pm_idle_save) | |
215 | pm_idle_save(); | |
216 | else | |
217 | acpi_safe_halt(); | |
218 | return; | |
219 | } | |
1da177e4 LT |
220 | |
221 | /* | |
222 | * Check BM Activity | |
223 | * ----------------- | |
224 | * Check for bus mastering activity (if required), record, and check | |
225 | * for demotion. | |
226 | */ | |
227 | if (pr->flags.bm_check) { | |
4be44fcd LB |
228 | u32 bm_status = 0; |
229 | unsigned long diff = jiffies - pr->power.bm_check_timestamp; | |
1da177e4 LT |
230 | |
231 | if (diff > 32) | |
232 | diff = 32; | |
233 | ||
234 | while (diff) { | |
235 | /* if we didn't get called, assume there was busmaster activity */ | |
236 | diff--; | |
237 | if (diff) | |
238 | pr->power.bm_activity |= 0x1; | |
239 | pr->power.bm_activity <<= 1; | |
240 | } | |
241 | ||
242 | acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, | |
4be44fcd | 243 | &bm_status, ACPI_MTX_DO_NOT_LOCK); |
1da177e4 LT |
244 | if (bm_status) { |
245 | pr->power.bm_activity++; | |
246 | acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, | |
4be44fcd | 247 | 1, ACPI_MTX_DO_NOT_LOCK); |
1da177e4 LT |
248 | } |
249 | /* | |
250 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect | |
251 | * the true state of bus mastering activity; forcing us to | |
252 | * manually check the BMIDEA bit of each IDE channel. | |
253 | */ | |
254 | else if (errata.piix4.bmisx) { | |
255 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) | |
4be44fcd | 256 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
1da177e4 LT |
257 | pr->power.bm_activity++; |
258 | } | |
259 | ||
260 | pr->power.bm_check_timestamp = jiffies; | |
261 | ||
262 | /* | |
263 | * Apply bus mastering demotion policy. Automatically demote | |
264 | * to avoid a faulty transition. Note that the processor | |
265 | * won't enter a low-power state during this call (to this | |
266 | * funciton) but should upon the next. | |
267 | * | |
268 | * TBD: A better policy might be to fallback to the demotion | |
269 | * state (use it for this quantum only) istead of | |
270 | * demoting -- and rely on duration as our sole demotion | |
271 | * qualification. This may, however, introduce DMA | |
272 | * issues (e.g. floppy DMA transfer overrun/underrun). | |
273 | */ | |
274 | if (pr->power.bm_activity & cx->demotion.threshold.bm) { | |
275 | local_irq_enable(); | |
276 | next_state = cx->demotion.state; | |
277 | goto end; | |
278 | } | |
279 | } | |
280 | ||
281 | cx->usage++; | |
282 | ||
4c033552 VP |
283 | #ifdef CONFIG_HOTPLUG_CPU |
284 | /* | |
285 | * Check for P_LVL2_UP flag before entering C2 and above on | |
286 | * an SMP system. We do it here instead of doing it at _CST/P_LVL | |
287 | * detection phase, to work cleanly with logical CPU hotplug. | |
288 | */ | |
289 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && | |
290 | !pr->flags.has_cst && acpi_fadt.plvl2_up) | |
291 | cx->type = ACPI_STATE_C1; | |
292 | #endif | |
1da177e4 LT |
293 | /* |
294 | * Sleep: | |
295 | * ------ | |
296 | * Invoke the current Cx state to put the processor to sleep. | |
297 | */ | |
298 | switch (cx->type) { | |
299 | ||
300 | case ACPI_STATE_C1: | |
301 | /* | |
302 | * Invoke C1. | |
303 | * Use the appropriate idle routine, the one that would | |
304 | * be used without acpi C-states. | |
305 | */ | |
306 | if (pm_idle_save) | |
307 | pm_idle_save(); | |
308 | else | |
64c7c8f8 NP |
309 | acpi_safe_halt(); |
310 | ||
1da177e4 | 311 | /* |
4be44fcd | 312 | * TBD: Can't get time duration while in C1, as resumes |
1da177e4 LT |
313 | * go to an ISR rather than here. Need to instrument |
314 | * base interrupt handler. | |
315 | */ | |
316 | sleep_ticks = 0xFFFFFFFF; | |
317 | break; | |
318 | ||
319 | case ACPI_STATE_C2: | |
320 | /* Get start time (ticks) */ | |
321 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); | |
322 | /* Invoke C2 */ | |
323 | inb(cx->address); | |
324 | /* Dummy op - must do something useless after P_LVL2 read */ | |
325 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
326 | /* Get end time (ticks) */ | |
327 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
328 | /* Re-enable interrupts */ | |
329 | local_irq_enable(); | |
330 | /* Compute time (ticks) that we were actually asleep */ | |
4be44fcd LB |
331 | sleep_ticks = |
332 | ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD; | |
1da177e4 LT |
333 | break; |
334 | ||
335 | case ACPI_STATE_C3: | |
4be44fcd | 336 | |
02df8b93 VP |
337 | if (pr->flags.bm_check) { |
338 | if (atomic_inc_return(&c3_cpu_count) == | |
4be44fcd | 339 | num_online_cpus()) { |
02df8b93 VP |
340 | /* |
341 | * All CPUs are trying to go to C3 | |
342 | * Disable bus master arbitration | |
343 | */ | |
344 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1, | |
4be44fcd | 345 | ACPI_MTX_DO_NOT_LOCK); |
02df8b93 VP |
346 | } |
347 | } else { | |
348 | /* SMP with no shared cache... Invalidate cache */ | |
349 | ACPI_FLUSH_CPU_CACHE(); | |
350 | } | |
4be44fcd | 351 | |
1da177e4 LT |
352 | /* Get start time (ticks) */ |
353 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); | |
354 | /* Invoke C3 */ | |
355 | inb(cx->address); | |
356 | /* Dummy op - must do something useless after P_LVL3 read */ | |
357 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
358 | /* Get end time (ticks) */ | |
359 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
02df8b93 VP |
360 | if (pr->flags.bm_check) { |
361 | /* Enable bus master arbitration */ | |
362 | atomic_dec(&c3_cpu_count); | |
4be44fcd LB |
363 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, |
364 | ACPI_MTX_DO_NOT_LOCK); | |
02df8b93 VP |
365 | } |
366 | ||
1da177e4 LT |
367 | /* Re-enable interrupts */ |
368 | local_irq_enable(); | |
369 | /* Compute time (ticks) that we were actually asleep */ | |
4be44fcd LB |
370 | sleep_ticks = |
371 | ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD; | |
1da177e4 LT |
372 | break; |
373 | ||
374 | default: | |
375 | local_irq_enable(); | |
376 | return; | |
377 | } | |
378 | ||
379 | next_state = pr->power.state; | |
380 | ||
381 | /* | |
382 | * Promotion? | |
383 | * ---------- | |
384 | * Track the number of longs (time asleep is greater than threshold) | |
385 | * and promote when the count threshold is reached. Note that bus | |
386 | * mastering activity may prevent promotions. | |
387 | * Do not promote above max_cstate. | |
388 | */ | |
389 | if (cx->promotion.state && | |
390 | ((cx->promotion.state - pr->power.states) <= max_cstate)) { | |
391 | if (sleep_ticks > cx->promotion.threshold.ticks) { | |
392 | cx->promotion.count++; | |
4be44fcd LB |
393 | cx->demotion.count = 0; |
394 | if (cx->promotion.count >= | |
395 | cx->promotion.threshold.count) { | |
1da177e4 | 396 | if (pr->flags.bm_check) { |
4be44fcd LB |
397 | if (! |
398 | (pr->power.bm_activity & cx-> | |
399 | promotion.threshold.bm)) { | |
400 | next_state = | |
401 | cx->promotion.state; | |
1da177e4 LT |
402 | goto end; |
403 | } | |
4be44fcd | 404 | } else { |
1da177e4 LT |
405 | next_state = cx->promotion.state; |
406 | goto end; | |
407 | } | |
408 | } | |
409 | } | |
410 | } | |
411 | ||
412 | /* | |
413 | * Demotion? | |
414 | * --------- | |
415 | * Track the number of shorts (time asleep is less than time threshold) | |
416 | * and demote when the usage threshold is reached. | |
417 | */ | |
418 | if (cx->demotion.state) { | |
419 | if (sleep_ticks < cx->demotion.threshold.ticks) { | |
420 | cx->demotion.count++; | |
421 | cx->promotion.count = 0; | |
422 | if (cx->demotion.count >= cx->demotion.threshold.count) { | |
423 | next_state = cx->demotion.state; | |
424 | goto end; | |
425 | } | |
426 | } | |
427 | } | |
428 | ||
4be44fcd | 429 | end: |
1da177e4 LT |
430 | /* |
431 | * Demote if current state exceeds max_cstate | |
432 | */ | |
433 | if ((pr->power.state - pr->power.states) > max_cstate) { | |
434 | if (cx->demotion.state) | |
435 | next_state = cx->demotion.state; | |
436 | } | |
437 | ||
438 | /* | |
439 | * New Cx State? | |
440 | * ------------- | |
441 | * If we're going to start using a new Cx state we must clean up | |
442 | * from the previous and prepare to use the new. | |
443 | */ | |
444 | if (next_state != pr->power.state) | |
445 | acpi_processor_power_activate(pr, next_state); | |
1da177e4 LT |
446 | } |
447 | ||
4be44fcd | 448 | static int acpi_processor_set_power_policy(struct acpi_processor *pr) |
1da177e4 LT |
449 | { |
450 | unsigned int i; | |
451 | unsigned int state_is_set = 0; | |
452 | struct acpi_processor_cx *lower = NULL; | |
453 | struct acpi_processor_cx *higher = NULL; | |
454 | struct acpi_processor_cx *cx; | |
455 | ||
4be44fcd | 456 | ACPI_FUNCTION_TRACE("acpi_processor_set_power_policy"); |
1da177e4 LT |
457 | |
458 | if (!pr) | |
459 | return_VALUE(-EINVAL); | |
460 | ||
461 | /* | |
462 | * This function sets the default Cx state policy (OS idle handler). | |
463 | * Our scheme is to promote quickly to C2 but more conservatively | |
464 | * to C3. We're favoring C2 for its characteristics of low latency | |
465 | * (quick response), good power savings, and ability to allow bus | |
466 | * mastering activity. Note that the Cx state policy is completely | |
467 | * customizable and can be altered dynamically. | |
468 | */ | |
469 | ||
470 | /* startup state */ | |
4be44fcd | 471 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
472 | cx = &pr->power.states[i]; |
473 | if (!cx->valid) | |
474 | continue; | |
475 | ||
476 | if (!state_is_set) | |
477 | pr->power.state = cx; | |
478 | state_is_set++; | |
479 | break; | |
4be44fcd | 480 | } |
1da177e4 LT |
481 | |
482 | if (!state_is_set) | |
483 | return_VALUE(-ENODEV); | |
484 | ||
485 | /* demotion */ | |
4be44fcd | 486 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
487 | cx = &pr->power.states[i]; |
488 | if (!cx->valid) | |
489 | continue; | |
490 | ||
491 | if (lower) { | |
492 | cx->demotion.state = lower; | |
493 | cx->demotion.threshold.ticks = cx->latency_ticks; | |
494 | cx->demotion.threshold.count = 1; | |
495 | if (cx->type == ACPI_STATE_C3) | |
496 | cx->demotion.threshold.bm = bm_history; | |
497 | } | |
498 | ||
499 | lower = cx; | |
500 | } | |
501 | ||
502 | /* promotion */ | |
503 | for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) { | |
504 | cx = &pr->power.states[i]; | |
505 | if (!cx->valid) | |
506 | continue; | |
507 | ||
508 | if (higher) { | |
4be44fcd | 509 | cx->promotion.state = higher; |
1da177e4 LT |
510 | cx->promotion.threshold.ticks = cx->latency_ticks; |
511 | if (cx->type >= ACPI_STATE_C2) | |
512 | cx->promotion.threshold.count = 4; | |
513 | else | |
514 | cx->promotion.threshold.count = 10; | |
515 | if (higher->type == ACPI_STATE_C3) | |
516 | cx->promotion.threshold.bm = bm_history; | |
517 | } | |
518 | ||
519 | higher = cx; | |
520 | } | |
521 | ||
4be44fcd | 522 | return_VALUE(0); |
1da177e4 LT |
523 | } |
524 | ||
4be44fcd | 525 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
1da177e4 | 526 | { |
1da177e4 LT |
527 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_fadt"); |
528 | ||
529 | if (!pr) | |
530 | return_VALUE(-EINVAL); | |
531 | ||
532 | if (!pr->pblk) | |
533 | return_VALUE(-ENODEV); | |
534 | ||
2203d6ed | 535 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
1da177e4 LT |
536 | |
537 | /* if info is obtained from pblk/fadt, type equals state */ | |
538 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; | |
539 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; | |
540 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; | |
541 | ||
542 | /* the C0 state only exists as a filler in our array, | |
543 | * and all processors need to support C1 */ | |
544 | pr->power.states[ACPI_STATE_C0].valid = 1; | |
545 | pr->power.states[ACPI_STATE_C1].valid = 1; | |
546 | ||
4c033552 VP |
547 | #ifndef CONFIG_HOTPLUG_CPU |
548 | /* | |
549 | * Check for P_LVL2_UP flag before entering C2 and above on | |
550 | * an SMP system. | |
551 | */ | |
552 | if ((num_online_cpus() > 1) && acpi_fadt.plvl2_up) | |
553 | return_VALUE(-ENODEV); | |
554 | #endif | |
555 | ||
1da177e4 LT |
556 | /* determine C2 and C3 address from pblk */ |
557 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; | |
558 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; | |
559 | ||
560 | /* determine latencies from FADT */ | |
561 | pr->power.states[ACPI_STATE_C2].latency = acpi_fadt.plvl2_lat; | |
562 | pr->power.states[ACPI_STATE_C3].latency = acpi_fadt.plvl3_lat; | |
563 | ||
564 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
565 | "lvl2[0x%08x] lvl3[0x%08x]\n", | |
566 | pr->power.states[ACPI_STATE_C2].address, | |
567 | pr->power.states[ACPI_STATE_C3].address)); | |
568 | ||
569 | return_VALUE(0); | |
570 | } | |
571 | ||
4be44fcd | 572 | static int acpi_processor_get_power_info_default_c1(struct acpi_processor *pr) |
acf05f4b | 573 | { |
acf05f4b VP |
574 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_default_c1"); |
575 | ||
2203d6ed | 576 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
acf05f4b VP |
577 | |
578 | /* if info is obtained from pblk/fadt, type equals state */ | |
579 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; | |
580 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; | |
581 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; | |
582 | ||
583 | /* the C0 state only exists as a filler in our array, | |
584 | * and all processors need to support C1 */ | |
585 | pr->power.states[ACPI_STATE_C0].valid = 1; | |
586 | pr->power.states[ACPI_STATE_C1].valid = 1; | |
587 | ||
588 | return_VALUE(0); | |
589 | } | |
590 | ||
4be44fcd | 591 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
1da177e4 | 592 | { |
4be44fcd LB |
593 | acpi_status status = 0; |
594 | acpi_integer count; | |
595 | int i; | |
596 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
597 | union acpi_object *cst; | |
1da177e4 LT |
598 | |
599 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_cst"); | |
600 | ||
1da177e4 LT |
601 | if (nocst) |
602 | return_VALUE(-ENODEV); | |
603 | ||
604 | pr->power.count = 0; | |
605 | for (i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++) | |
4be44fcd | 606 | memset(&(pr->power.states[i]), 0, |
0b6b2f08 | 607 | sizeof(struct acpi_processor_cx)); |
1da177e4 LT |
608 | |
609 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); | |
610 | if (ACPI_FAILURE(status)) { | |
611 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); | |
612 | return_VALUE(-ENODEV); | |
4be44fcd | 613 | } |
1da177e4 | 614 | |
4be44fcd | 615 | cst = (union acpi_object *)buffer.pointer; |
1da177e4 LT |
616 | |
617 | /* There must be at least 2 elements */ | |
618 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { | |
4be44fcd LB |
619 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
620 | "not enough elements in _CST\n")); | |
1da177e4 LT |
621 | status = -EFAULT; |
622 | goto end; | |
623 | } | |
624 | ||
625 | count = cst->package.elements[0].integer.value; | |
626 | ||
627 | /* Validate number of power states. */ | |
628 | if (count < 1 || count != cst->package.count - 1) { | |
4be44fcd LB |
629 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
630 | "count given by _CST is not valid\n")); | |
1da177e4 LT |
631 | status = -EFAULT; |
632 | goto end; | |
633 | } | |
634 | ||
635 | /* We support up to ACPI_PROCESSOR_MAX_POWER. */ | |
636 | if (count > ACPI_PROCESSOR_MAX_POWER) { | |
4be44fcd LB |
637 | printk(KERN_WARNING |
638 | "Limiting number of power states to max (%d)\n", | |
639 | ACPI_PROCESSOR_MAX_POWER); | |
640 | printk(KERN_WARNING | |
641 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); | |
1da177e4 LT |
642 | count = ACPI_PROCESSOR_MAX_POWER; |
643 | } | |
644 | ||
645 | /* Tell driver that at least _CST is supported. */ | |
646 | pr->flags.has_cst = 1; | |
647 | ||
648 | for (i = 1; i <= count; i++) { | |
649 | union acpi_object *element; | |
650 | union acpi_object *obj; | |
651 | struct acpi_power_register *reg; | |
652 | struct acpi_processor_cx cx; | |
653 | ||
654 | memset(&cx, 0, sizeof(cx)); | |
655 | ||
4be44fcd | 656 | element = (union acpi_object *)&(cst->package.elements[i]); |
1da177e4 LT |
657 | if (element->type != ACPI_TYPE_PACKAGE) |
658 | continue; | |
659 | ||
660 | if (element->package.count != 4) | |
661 | continue; | |
662 | ||
4be44fcd | 663 | obj = (union acpi_object *)&(element->package.elements[0]); |
1da177e4 LT |
664 | |
665 | if (obj->type != ACPI_TYPE_BUFFER) | |
666 | continue; | |
667 | ||
4be44fcd | 668 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
1da177e4 LT |
669 | |
670 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && | |
4be44fcd | 671 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
1da177e4 LT |
672 | continue; |
673 | ||
674 | cx.address = (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) ? | |
4be44fcd | 675 | 0 : reg->address; |
1da177e4 LT |
676 | |
677 | /* There should be an easy way to extract an integer... */ | |
4be44fcd | 678 | obj = (union acpi_object *)&(element->package.elements[1]); |
1da177e4 LT |
679 | if (obj->type != ACPI_TYPE_INTEGER) |
680 | continue; | |
681 | ||
682 | cx.type = obj->integer.value; | |
683 | ||
684 | if ((cx.type != ACPI_STATE_C1) && | |
685 | (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO)) | |
686 | continue; | |
687 | ||
4be44fcd | 688 | if ((cx.type < ACPI_STATE_C1) || (cx.type > ACPI_STATE_C3)) |
1da177e4 LT |
689 | continue; |
690 | ||
4be44fcd | 691 | obj = (union acpi_object *)&(element->package.elements[2]); |
1da177e4 LT |
692 | if (obj->type != ACPI_TYPE_INTEGER) |
693 | continue; | |
694 | ||
695 | cx.latency = obj->integer.value; | |
696 | ||
4be44fcd | 697 | obj = (union acpi_object *)&(element->package.elements[3]); |
1da177e4 LT |
698 | if (obj->type != ACPI_TYPE_INTEGER) |
699 | continue; | |
700 | ||
701 | cx.power = obj->integer.value; | |
702 | ||
703 | (pr->power.count)++; | |
704 | memcpy(&(pr->power.states[pr->power.count]), &cx, sizeof(cx)); | |
705 | } | |
706 | ||
4be44fcd LB |
707 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
708 | pr->power.count)); | |
1da177e4 LT |
709 | |
710 | /* Validate number of power states discovered */ | |
711 | if (pr->power.count < 2) | |
6d93c648 | 712 | status = -EFAULT; |
1da177e4 | 713 | |
4be44fcd | 714 | end: |
1da177e4 LT |
715 | acpi_os_free(buffer.pointer); |
716 | ||
717 | return_VALUE(status); | |
718 | } | |
719 | ||
1da177e4 LT |
720 | static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) |
721 | { | |
722 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c2"); | |
723 | ||
724 | if (!cx->address) | |
725 | return_VOID; | |
726 | ||
727 | /* | |
728 | * C2 latency must be less than or equal to 100 | |
729 | * microseconds. | |
730 | */ | |
731 | else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { | |
732 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 733 | "latency too large [%d]\n", cx->latency)); |
1da177e4 LT |
734 | return_VOID; |
735 | } | |
736 | ||
1da177e4 LT |
737 | /* |
738 | * Otherwise we've met all of our C2 requirements. | |
739 | * Normalize the C2 latency to expidite policy | |
740 | */ | |
741 | cx->valid = 1; | |
742 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); | |
743 | ||
744 | return_VOID; | |
745 | } | |
746 | ||
4be44fcd LB |
747 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
748 | struct acpi_processor_cx *cx) | |
1da177e4 | 749 | { |
02df8b93 VP |
750 | static int bm_check_flag; |
751 | ||
1da177e4 LT |
752 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c3"); |
753 | ||
754 | if (!cx->address) | |
755 | return_VOID; | |
756 | ||
757 | /* | |
758 | * C3 latency must be less than or equal to 1000 | |
759 | * microseconds. | |
760 | */ | |
761 | else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { | |
762 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 763 | "latency too large [%d]\n", cx->latency)); |
1da177e4 LT |
764 | return_VOID; |
765 | } | |
766 | ||
1da177e4 LT |
767 | /* |
768 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) | |
769 | * DMA transfers are used by any ISA device to avoid livelock. | |
770 | * Note that we could disable Type-F DMA (as recommended by | |
771 | * the erratum), but this is known to disrupt certain ISA | |
772 | * devices thus we take the conservative approach. | |
773 | */ | |
774 | else if (errata.piix4.fdma) { | |
775 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 776 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
1da177e4 LT |
777 | return_VOID; |
778 | } | |
779 | ||
02df8b93 VP |
780 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
781 | if (!bm_check_flag) { | |
782 | /* Determine whether bm_check is needed based on CPU */ | |
783 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); | |
784 | bm_check_flag = pr->flags.bm_check; | |
785 | } else { | |
786 | pr->flags.bm_check = bm_check_flag; | |
787 | } | |
788 | ||
789 | if (pr->flags.bm_check) { | |
02df8b93 VP |
790 | /* bus mastering control is necessary */ |
791 | if (!pr->flags.bm_control) { | |
792 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 793 | "C3 support requires bus mastering control\n")); |
02df8b93 VP |
794 | return_VOID; |
795 | } | |
796 | } else { | |
02df8b93 VP |
797 | /* |
798 | * WBINVD should be set in fadt, for C3 state to be | |
799 | * supported on when bm_check is not required. | |
800 | */ | |
801 | if (acpi_fadt.wb_invd != 1) { | |
802 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
803 | "Cache invalidation should work properly" |
804 | " for C3 to be enabled on SMP systems\n")); | |
02df8b93 VP |
805 | return_VOID; |
806 | } | |
807 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, | |
4be44fcd | 808 | 0, ACPI_MTX_DO_NOT_LOCK); |
02df8b93 VP |
809 | } |
810 | ||
1da177e4 LT |
811 | /* |
812 | * Otherwise we've met all of our C3 requirements. | |
813 | * Normalize the C3 latency to expidite policy. Enable | |
814 | * checking of bus mastering status (bm_check) so we can | |
815 | * use this in our C3 policy | |
816 | */ | |
817 | cx->valid = 1; | |
818 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); | |
1da177e4 LT |
819 | |
820 | return_VOID; | |
821 | } | |
822 | ||
1da177e4 LT |
823 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
824 | { | |
825 | unsigned int i; | |
826 | unsigned int working = 0; | |
827 | ||
4be44fcd | 828 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
829 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
830 | ||
831 | switch (cx->type) { | |
832 | case ACPI_STATE_C1: | |
833 | cx->valid = 1; | |
834 | break; | |
835 | ||
836 | case ACPI_STATE_C2: | |
837 | acpi_processor_power_verify_c2(cx); | |
838 | break; | |
839 | ||
840 | case ACPI_STATE_C3: | |
841 | acpi_processor_power_verify_c3(pr, cx); | |
842 | break; | |
843 | } | |
844 | ||
845 | if (cx->valid) | |
846 | working++; | |
847 | } | |
848 | ||
849 | return (working); | |
850 | } | |
851 | ||
4be44fcd | 852 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
1da177e4 LT |
853 | { |
854 | unsigned int i; | |
855 | int result; | |
856 | ||
857 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info"); | |
858 | ||
859 | /* NOTE: the idle thread may not be running while calling | |
860 | * this function */ | |
861 | ||
862 | result = acpi_processor_get_power_info_cst(pr); | |
6d93c648 | 863 | if (result == -ENODEV) |
1da177e4 | 864 | result = acpi_processor_get_power_info_fadt(pr); |
6d93c648 VP |
865 | |
866 | if ((result) || (acpi_processor_power_verify(pr) < 2)) | |
867 | result = acpi_processor_get_power_info_default_c1(pr); | |
1da177e4 LT |
868 | |
869 | /* | |
870 | * Set Default Policy | |
871 | * ------------------ | |
872 | * Now that we know which states are supported, set the default | |
873 | * policy. Note that this policy can be changed dynamically | |
874 | * (e.g. encourage deeper sleeps to conserve battery life when | |
875 | * not on AC). | |
876 | */ | |
877 | result = acpi_processor_set_power_policy(pr); | |
878 | if (result) | |
879 | return_VALUE(result); | |
880 | ||
881 | /* | |
882 | * if one state of type C2 or C3 is available, mark this | |
883 | * CPU as being "idle manageable" | |
884 | */ | |
885 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { | |
acf05f4b | 886 | if (pr->power.states[i].valid) { |
1da177e4 | 887 | pr->power.count = i; |
2203d6ed LT |
888 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
889 | pr->flags.power = 1; | |
acf05f4b | 890 | } |
1da177e4 LT |
891 | } |
892 | ||
893 | return_VALUE(0); | |
894 | } | |
895 | ||
4be44fcd | 896 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
1da177e4 | 897 | { |
4be44fcd | 898 | int result = 0; |
1da177e4 LT |
899 | |
900 | ACPI_FUNCTION_TRACE("acpi_processor_cst_has_changed"); | |
901 | ||
902 | if (!pr) | |
4be44fcd | 903 | return_VALUE(-EINVAL); |
1da177e4 | 904 | |
4be44fcd | 905 | if (nocst) { |
1da177e4 LT |
906 | return_VALUE(-ENODEV); |
907 | } | |
908 | ||
909 | if (!pr->flags.power_setup_done) | |
910 | return_VALUE(-ENODEV); | |
911 | ||
912 | /* Fall back to the default idle loop */ | |
913 | pm_idle = pm_idle_save; | |
4be44fcd | 914 | synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ |
1da177e4 LT |
915 | |
916 | pr->flags.power = 0; | |
917 | result = acpi_processor_get_power_info(pr); | |
918 | if ((pr->flags.power == 1) && (pr->flags.power_setup_done)) | |
919 | pm_idle = acpi_processor_idle; | |
920 | ||
921 | return_VALUE(result); | |
922 | } | |
923 | ||
924 | /* proc interface */ | |
925 | ||
926 | static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) | |
927 | { | |
4be44fcd LB |
928 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
929 | unsigned int i; | |
1da177e4 LT |
930 | |
931 | ACPI_FUNCTION_TRACE("acpi_processor_power_seq_show"); | |
932 | ||
933 | if (!pr) | |
934 | goto end; | |
935 | ||
936 | seq_printf(seq, "active state: C%zd\n" | |
4be44fcd LB |
937 | "max_cstate: C%d\n" |
938 | "bus master activity: %08x\n", | |
939 | pr->power.state ? pr->power.state - pr->power.states : 0, | |
940 | max_cstate, (unsigned)pr->power.bm_activity); | |
1da177e4 LT |
941 | |
942 | seq_puts(seq, "states:\n"); | |
943 | ||
944 | for (i = 1; i <= pr->power.count; i++) { | |
945 | seq_printf(seq, " %cC%d: ", | |
4be44fcd LB |
946 | (&pr->power.states[i] == |
947 | pr->power.state ? '*' : ' '), i); | |
1da177e4 LT |
948 | |
949 | if (!pr->power.states[i].valid) { | |
950 | seq_puts(seq, "<not supported>\n"); | |
951 | continue; | |
952 | } | |
953 | ||
954 | switch (pr->power.states[i].type) { | |
955 | case ACPI_STATE_C1: | |
956 | seq_printf(seq, "type[C1] "); | |
957 | break; | |
958 | case ACPI_STATE_C2: | |
959 | seq_printf(seq, "type[C2] "); | |
960 | break; | |
961 | case ACPI_STATE_C3: | |
962 | seq_printf(seq, "type[C3] "); | |
963 | break; | |
964 | default: | |
965 | seq_printf(seq, "type[--] "); | |
966 | break; | |
967 | } | |
968 | ||
969 | if (pr->power.states[i].promotion.state) | |
970 | seq_printf(seq, "promotion[C%zd] ", | |
4be44fcd LB |
971 | (pr->power.states[i].promotion.state - |
972 | pr->power.states)); | |
1da177e4 LT |
973 | else |
974 | seq_puts(seq, "promotion[--] "); | |
975 | ||
976 | if (pr->power.states[i].demotion.state) | |
977 | seq_printf(seq, "demotion[C%zd] ", | |
4be44fcd LB |
978 | (pr->power.states[i].demotion.state - |
979 | pr->power.states)); | |
1da177e4 LT |
980 | else |
981 | seq_puts(seq, "demotion[--] "); | |
982 | ||
983 | seq_printf(seq, "latency[%03d] usage[%08d]\n", | |
4be44fcd LB |
984 | pr->power.states[i].latency, |
985 | pr->power.states[i].usage); | |
1da177e4 LT |
986 | } |
987 | ||
4be44fcd | 988 | end: |
1da177e4 LT |
989 | return_VALUE(0); |
990 | } | |
991 | ||
992 | static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) | |
993 | { | |
994 | return single_open(file, acpi_processor_power_seq_show, | |
4be44fcd | 995 | PDE(inode)->data); |
1da177e4 LT |
996 | } |
997 | ||
998 | static struct file_operations acpi_processor_power_fops = { | |
4be44fcd LB |
999 | .open = acpi_processor_power_open_fs, |
1000 | .read = seq_read, | |
1001 | .llseek = seq_lseek, | |
1002 | .release = single_release, | |
1da177e4 LT |
1003 | }; |
1004 | ||
4be44fcd LB |
1005 | int acpi_processor_power_init(struct acpi_processor *pr, |
1006 | struct acpi_device *device) | |
1da177e4 | 1007 | { |
4be44fcd LB |
1008 | acpi_status status = 0; |
1009 | static int first_run = 0; | |
1010 | struct proc_dir_entry *entry = NULL; | |
1da177e4 LT |
1011 | unsigned int i; |
1012 | ||
1013 | ACPI_FUNCTION_TRACE("acpi_processor_power_init"); | |
1014 | ||
1015 | if (!first_run) { | |
1016 | dmi_check_system(processor_power_dmi_table); | |
1017 | if (max_cstate < ACPI_C_STATES_MAX) | |
4be44fcd LB |
1018 | printk(KERN_NOTICE |
1019 | "ACPI: processor limited to max C-state %d\n", | |
1020 | max_cstate); | |
1da177e4 LT |
1021 | first_run++; |
1022 | } | |
1023 | ||
02df8b93 VP |
1024 | if (!pr) |
1025 | return_VALUE(-EINVAL); | |
1026 | ||
1027 | if (acpi_fadt.cst_cnt && !nocst) { | |
4be44fcd LB |
1028 | status = |
1029 | acpi_os_write_port(acpi_fadt.smi_cmd, acpi_fadt.cst_cnt, 8); | |
1da177e4 LT |
1030 | if (ACPI_FAILURE(status)) { |
1031 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
1032 | "Notifying BIOS of _CST ability failed\n")); | |
1033 | } | |
1034 | } | |
1035 | ||
02df8b93 VP |
1036 | acpi_processor_power_init_pdc(&(pr->power), pr->id); |
1037 | acpi_processor_set_pdc(pr, pr->power.pdc); | |
1da177e4 LT |
1038 | acpi_processor_get_power_info(pr); |
1039 | ||
1040 | /* | |
1041 | * Install the idle handler if processor power management is supported. | |
1042 | * Note that we use previously set idle handler will be used on | |
1043 | * platforms that only support C1. | |
1044 | */ | |
1045 | if ((pr->flags.power) && (!boot_option_idle_override)) { | |
1046 | printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); | |
1047 | for (i = 1; i <= pr->power.count; i++) | |
1048 | if (pr->power.states[i].valid) | |
4be44fcd LB |
1049 | printk(" C%d[C%d]", i, |
1050 | pr->power.states[i].type); | |
1da177e4 LT |
1051 | printk(")\n"); |
1052 | ||
1053 | if (pr->id == 0) { | |
1054 | pm_idle_save = pm_idle; | |
1055 | pm_idle = acpi_processor_idle; | |
1056 | } | |
1057 | } | |
1058 | ||
1059 | /* 'power' [R] */ | |
1060 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, | |
4be44fcd | 1061 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 LT |
1062 | if (!entry) |
1063 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
1064 | "Unable to create '%s' fs entry\n", |
1065 | ACPI_PROCESSOR_FILE_POWER)); | |
1da177e4 LT |
1066 | else { |
1067 | entry->proc_fops = &acpi_processor_power_fops; | |
1068 | entry->data = acpi_driver_data(device); | |
1069 | entry->owner = THIS_MODULE; | |
1070 | } | |
1071 | ||
1072 | pr->flags.power_setup_done = 1; | |
1073 | ||
1074 | return_VALUE(0); | |
1075 | } | |
1076 | ||
4be44fcd LB |
1077 | int acpi_processor_power_exit(struct acpi_processor *pr, |
1078 | struct acpi_device *device) | |
1da177e4 LT |
1079 | { |
1080 | ACPI_FUNCTION_TRACE("acpi_processor_power_exit"); | |
1081 | ||
1082 | pr->flags.power_setup_done = 0; | |
1083 | ||
1084 | if (acpi_device_dir(device)) | |
4be44fcd LB |
1085 | remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
1086 | acpi_device_dir(device)); | |
1da177e4 LT |
1087 | |
1088 | /* Unregister the idle handler when processor #0 is removed. */ | |
1089 | if (pr->id == 0) { | |
1090 | pm_idle = pm_idle_save; | |
1091 | ||
1092 | /* | |
1093 | * We are about to unload the current idle thread pm callback | |
1094 | * (pm_idle), Wait for all processors to update cached/local | |
1095 | * copies of pm_idle before proceeding. | |
1096 | */ | |
1097 | cpu_idle_wait(); | |
1098 | } | |
1099 | ||
1100 | return_VALUE(0); | |
1101 | } |