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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 | ||
283 | /* | |
284 | * Sleep: | |
285 | * ------ | |
286 | * Invoke the current Cx state to put the processor to sleep. | |
287 | */ | |
288 | switch (cx->type) { | |
289 | ||
290 | case ACPI_STATE_C1: | |
291 | /* | |
292 | * Invoke C1. | |
293 | * Use the appropriate idle routine, the one that would | |
294 | * be used without acpi C-states. | |
295 | */ | |
296 | if (pm_idle_save) | |
297 | pm_idle_save(); | |
298 | else | |
64c7c8f8 NP |
299 | acpi_safe_halt(); |
300 | ||
1da177e4 | 301 | /* |
4be44fcd | 302 | * TBD: Can't get time duration while in C1, as resumes |
1da177e4 LT |
303 | * go to an ISR rather than here. Need to instrument |
304 | * base interrupt handler. | |
305 | */ | |
306 | sleep_ticks = 0xFFFFFFFF; | |
307 | break; | |
308 | ||
309 | case ACPI_STATE_C2: | |
310 | /* Get start time (ticks) */ | |
311 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); | |
312 | /* Invoke C2 */ | |
313 | inb(cx->address); | |
314 | /* Dummy op - must do something useless after P_LVL2 read */ | |
315 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
316 | /* Get end time (ticks) */ | |
317 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
318 | /* Re-enable interrupts */ | |
319 | local_irq_enable(); | |
320 | /* Compute time (ticks) that we were actually asleep */ | |
4be44fcd LB |
321 | sleep_ticks = |
322 | ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD; | |
1da177e4 LT |
323 | break; |
324 | ||
325 | case ACPI_STATE_C3: | |
4be44fcd | 326 | |
02df8b93 VP |
327 | if (pr->flags.bm_check) { |
328 | if (atomic_inc_return(&c3_cpu_count) == | |
4be44fcd | 329 | num_online_cpus()) { |
02df8b93 VP |
330 | /* |
331 | * All CPUs are trying to go to C3 | |
332 | * Disable bus master arbitration | |
333 | */ | |
334 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1, | |
4be44fcd | 335 | ACPI_MTX_DO_NOT_LOCK); |
02df8b93 VP |
336 | } |
337 | } else { | |
338 | /* SMP with no shared cache... Invalidate cache */ | |
339 | ACPI_FLUSH_CPU_CACHE(); | |
340 | } | |
4be44fcd | 341 | |
1da177e4 LT |
342 | /* Get start time (ticks) */ |
343 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); | |
344 | /* Invoke C3 */ | |
345 | inb(cx->address); | |
346 | /* Dummy op - must do something useless after P_LVL3 read */ | |
347 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
348 | /* Get end time (ticks) */ | |
349 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
02df8b93 VP |
350 | if (pr->flags.bm_check) { |
351 | /* Enable bus master arbitration */ | |
352 | atomic_dec(&c3_cpu_count); | |
4be44fcd LB |
353 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, |
354 | ACPI_MTX_DO_NOT_LOCK); | |
02df8b93 VP |
355 | } |
356 | ||
1da177e4 LT |
357 | /* Re-enable interrupts */ |
358 | local_irq_enable(); | |
359 | /* Compute time (ticks) that we were actually asleep */ | |
4be44fcd LB |
360 | sleep_ticks = |
361 | ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD; | |
1da177e4 LT |
362 | break; |
363 | ||
364 | default: | |
365 | local_irq_enable(); | |
366 | return; | |
367 | } | |
368 | ||
369 | next_state = pr->power.state; | |
370 | ||
371 | /* | |
372 | * Promotion? | |
373 | * ---------- | |
374 | * Track the number of longs (time asleep is greater than threshold) | |
375 | * and promote when the count threshold is reached. Note that bus | |
376 | * mastering activity may prevent promotions. | |
377 | * Do not promote above max_cstate. | |
378 | */ | |
379 | if (cx->promotion.state && | |
380 | ((cx->promotion.state - pr->power.states) <= max_cstate)) { | |
381 | if (sleep_ticks > cx->promotion.threshold.ticks) { | |
382 | cx->promotion.count++; | |
4be44fcd LB |
383 | cx->demotion.count = 0; |
384 | if (cx->promotion.count >= | |
385 | cx->promotion.threshold.count) { | |
1da177e4 | 386 | if (pr->flags.bm_check) { |
4be44fcd LB |
387 | if (! |
388 | (pr->power.bm_activity & cx-> | |
389 | promotion.threshold.bm)) { | |
390 | next_state = | |
391 | cx->promotion.state; | |
1da177e4 LT |
392 | goto end; |
393 | } | |
4be44fcd | 394 | } else { |
1da177e4 LT |
395 | next_state = cx->promotion.state; |
396 | goto end; | |
397 | } | |
398 | } | |
399 | } | |
400 | } | |
401 | ||
402 | /* | |
403 | * Demotion? | |
404 | * --------- | |
405 | * Track the number of shorts (time asleep is less than time threshold) | |
406 | * and demote when the usage threshold is reached. | |
407 | */ | |
408 | if (cx->demotion.state) { | |
409 | if (sleep_ticks < cx->demotion.threshold.ticks) { | |
410 | cx->demotion.count++; | |
411 | cx->promotion.count = 0; | |
412 | if (cx->demotion.count >= cx->demotion.threshold.count) { | |
413 | next_state = cx->demotion.state; | |
414 | goto end; | |
415 | } | |
416 | } | |
417 | } | |
418 | ||
4be44fcd | 419 | end: |
1da177e4 LT |
420 | /* |
421 | * Demote if current state exceeds max_cstate | |
422 | */ | |
423 | if ((pr->power.state - pr->power.states) > max_cstate) { | |
424 | if (cx->demotion.state) | |
425 | next_state = cx->demotion.state; | |
426 | } | |
427 | ||
428 | /* | |
429 | * New Cx State? | |
430 | * ------------- | |
431 | * If we're going to start using a new Cx state we must clean up | |
432 | * from the previous and prepare to use the new. | |
433 | */ | |
434 | if (next_state != pr->power.state) | |
435 | acpi_processor_power_activate(pr, next_state); | |
1da177e4 LT |
436 | } |
437 | ||
4be44fcd | 438 | static int acpi_processor_set_power_policy(struct acpi_processor *pr) |
1da177e4 LT |
439 | { |
440 | unsigned int i; | |
441 | unsigned int state_is_set = 0; | |
442 | struct acpi_processor_cx *lower = NULL; | |
443 | struct acpi_processor_cx *higher = NULL; | |
444 | struct acpi_processor_cx *cx; | |
445 | ||
4be44fcd | 446 | ACPI_FUNCTION_TRACE("acpi_processor_set_power_policy"); |
1da177e4 LT |
447 | |
448 | if (!pr) | |
449 | return_VALUE(-EINVAL); | |
450 | ||
451 | /* | |
452 | * This function sets the default Cx state policy (OS idle handler). | |
453 | * Our scheme is to promote quickly to C2 but more conservatively | |
454 | * to C3. We're favoring C2 for its characteristics of low latency | |
455 | * (quick response), good power savings, and ability to allow bus | |
456 | * mastering activity. Note that the Cx state policy is completely | |
457 | * customizable and can be altered dynamically. | |
458 | */ | |
459 | ||
460 | /* startup state */ | |
4be44fcd | 461 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
462 | cx = &pr->power.states[i]; |
463 | if (!cx->valid) | |
464 | continue; | |
465 | ||
466 | if (!state_is_set) | |
467 | pr->power.state = cx; | |
468 | state_is_set++; | |
469 | break; | |
4be44fcd | 470 | } |
1da177e4 LT |
471 | |
472 | if (!state_is_set) | |
473 | return_VALUE(-ENODEV); | |
474 | ||
475 | /* demotion */ | |
4be44fcd | 476 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
477 | cx = &pr->power.states[i]; |
478 | if (!cx->valid) | |
479 | continue; | |
480 | ||
481 | if (lower) { | |
482 | cx->demotion.state = lower; | |
483 | cx->demotion.threshold.ticks = cx->latency_ticks; | |
484 | cx->demotion.threshold.count = 1; | |
485 | if (cx->type == ACPI_STATE_C3) | |
486 | cx->demotion.threshold.bm = bm_history; | |
487 | } | |
488 | ||
489 | lower = cx; | |
490 | } | |
491 | ||
492 | /* promotion */ | |
493 | for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) { | |
494 | cx = &pr->power.states[i]; | |
495 | if (!cx->valid) | |
496 | continue; | |
497 | ||
498 | if (higher) { | |
4be44fcd | 499 | cx->promotion.state = higher; |
1da177e4 LT |
500 | cx->promotion.threshold.ticks = cx->latency_ticks; |
501 | if (cx->type >= ACPI_STATE_C2) | |
502 | cx->promotion.threshold.count = 4; | |
503 | else | |
504 | cx->promotion.threshold.count = 10; | |
505 | if (higher->type == ACPI_STATE_C3) | |
506 | cx->promotion.threshold.bm = bm_history; | |
507 | } | |
508 | ||
509 | higher = cx; | |
510 | } | |
511 | ||
4be44fcd | 512 | return_VALUE(0); |
1da177e4 LT |
513 | } |
514 | ||
4be44fcd | 515 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
1da177e4 | 516 | { |
1da177e4 LT |
517 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_fadt"); |
518 | ||
519 | if (!pr) | |
520 | return_VALUE(-EINVAL); | |
521 | ||
522 | if (!pr->pblk) | |
523 | return_VALUE(-ENODEV); | |
524 | ||
2203d6ed | 525 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
1da177e4 LT |
526 | |
527 | /* if info is obtained from pblk/fadt, type equals state */ | |
528 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; | |
529 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; | |
530 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; | |
531 | ||
532 | /* the C0 state only exists as a filler in our array, | |
533 | * and all processors need to support C1 */ | |
534 | pr->power.states[ACPI_STATE_C0].valid = 1; | |
535 | pr->power.states[ACPI_STATE_C1].valid = 1; | |
536 | ||
537 | /* determine C2 and C3 address from pblk */ | |
538 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; | |
539 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; | |
540 | ||
541 | /* determine latencies from FADT */ | |
542 | pr->power.states[ACPI_STATE_C2].latency = acpi_fadt.plvl2_lat; | |
543 | pr->power.states[ACPI_STATE_C3].latency = acpi_fadt.plvl3_lat; | |
544 | ||
545 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
546 | "lvl2[0x%08x] lvl3[0x%08x]\n", | |
547 | pr->power.states[ACPI_STATE_C2].address, | |
548 | pr->power.states[ACPI_STATE_C3].address)); | |
549 | ||
550 | return_VALUE(0); | |
551 | } | |
552 | ||
4be44fcd | 553 | static int acpi_processor_get_power_info_default_c1(struct acpi_processor *pr) |
acf05f4b | 554 | { |
acf05f4b VP |
555 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_default_c1"); |
556 | ||
2203d6ed | 557 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
acf05f4b VP |
558 | |
559 | /* if info is obtained from pblk/fadt, type equals state */ | |
560 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; | |
561 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; | |
562 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; | |
563 | ||
564 | /* the C0 state only exists as a filler in our array, | |
565 | * and all processors need to support C1 */ | |
566 | pr->power.states[ACPI_STATE_C0].valid = 1; | |
567 | pr->power.states[ACPI_STATE_C1].valid = 1; | |
568 | ||
569 | return_VALUE(0); | |
570 | } | |
571 | ||
4be44fcd | 572 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
1da177e4 | 573 | { |
4be44fcd LB |
574 | acpi_status status = 0; |
575 | acpi_integer count; | |
576 | int i; | |
577 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
578 | union acpi_object *cst; | |
1da177e4 LT |
579 | |
580 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_cst"); | |
581 | ||
1da177e4 LT |
582 | if (nocst) |
583 | return_VALUE(-ENODEV); | |
584 | ||
585 | pr->power.count = 0; | |
586 | for (i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++) | |
4be44fcd | 587 | memset(&(pr->power.states[i]), 0, |
0b6b2f08 | 588 | sizeof(struct acpi_processor_cx)); |
1da177e4 LT |
589 | |
590 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); | |
591 | if (ACPI_FAILURE(status)) { | |
592 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); | |
593 | return_VALUE(-ENODEV); | |
4be44fcd | 594 | } |
1da177e4 | 595 | |
4be44fcd | 596 | cst = (union acpi_object *)buffer.pointer; |
1da177e4 LT |
597 | |
598 | /* There must be at least 2 elements */ | |
599 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { | |
4be44fcd LB |
600 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
601 | "not enough elements in _CST\n")); | |
1da177e4 LT |
602 | status = -EFAULT; |
603 | goto end; | |
604 | } | |
605 | ||
606 | count = cst->package.elements[0].integer.value; | |
607 | ||
608 | /* Validate number of power states. */ | |
609 | if (count < 1 || count != cst->package.count - 1) { | |
4be44fcd LB |
610 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
611 | "count given by _CST is not valid\n")); | |
1da177e4 LT |
612 | status = -EFAULT; |
613 | goto end; | |
614 | } | |
615 | ||
616 | /* We support up to ACPI_PROCESSOR_MAX_POWER. */ | |
617 | if (count > ACPI_PROCESSOR_MAX_POWER) { | |
4be44fcd LB |
618 | printk(KERN_WARNING |
619 | "Limiting number of power states to max (%d)\n", | |
620 | ACPI_PROCESSOR_MAX_POWER); | |
621 | printk(KERN_WARNING | |
622 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); | |
1da177e4 LT |
623 | count = ACPI_PROCESSOR_MAX_POWER; |
624 | } | |
625 | ||
626 | /* Tell driver that at least _CST is supported. */ | |
627 | pr->flags.has_cst = 1; | |
628 | ||
629 | for (i = 1; i <= count; i++) { | |
630 | union acpi_object *element; | |
631 | union acpi_object *obj; | |
632 | struct acpi_power_register *reg; | |
633 | struct acpi_processor_cx cx; | |
634 | ||
635 | memset(&cx, 0, sizeof(cx)); | |
636 | ||
4be44fcd | 637 | element = (union acpi_object *)&(cst->package.elements[i]); |
1da177e4 LT |
638 | if (element->type != ACPI_TYPE_PACKAGE) |
639 | continue; | |
640 | ||
641 | if (element->package.count != 4) | |
642 | continue; | |
643 | ||
4be44fcd | 644 | obj = (union acpi_object *)&(element->package.elements[0]); |
1da177e4 LT |
645 | |
646 | if (obj->type != ACPI_TYPE_BUFFER) | |
647 | continue; | |
648 | ||
4be44fcd | 649 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
1da177e4 LT |
650 | |
651 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && | |
4be44fcd | 652 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
1da177e4 LT |
653 | continue; |
654 | ||
655 | cx.address = (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) ? | |
4be44fcd | 656 | 0 : reg->address; |
1da177e4 LT |
657 | |
658 | /* There should be an easy way to extract an integer... */ | |
4be44fcd | 659 | obj = (union acpi_object *)&(element->package.elements[1]); |
1da177e4 LT |
660 | if (obj->type != ACPI_TYPE_INTEGER) |
661 | continue; | |
662 | ||
663 | cx.type = obj->integer.value; | |
664 | ||
665 | if ((cx.type != ACPI_STATE_C1) && | |
666 | (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO)) | |
667 | continue; | |
668 | ||
4be44fcd | 669 | if ((cx.type < ACPI_STATE_C1) || (cx.type > ACPI_STATE_C3)) |
1da177e4 LT |
670 | continue; |
671 | ||
4be44fcd | 672 | obj = (union acpi_object *)&(element->package.elements[2]); |
1da177e4 LT |
673 | if (obj->type != ACPI_TYPE_INTEGER) |
674 | continue; | |
675 | ||
676 | cx.latency = obj->integer.value; | |
677 | ||
4be44fcd | 678 | obj = (union acpi_object *)&(element->package.elements[3]); |
1da177e4 LT |
679 | if (obj->type != ACPI_TYPE_INTEGER) |
680 | continue; | |
681 | ||
682 | cx.power = obj->integer.value; | |
683 | ||
684 | (pr->power.count)++; | |
685 | memcpy(&(pr->power.states[pr->power.count]), &cx, sizeof(cx)); | |
686 | } | |
687 | ||
4be44fcd LB |
688 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
689 | pr->power.count)); | |
1da177e4 LT |
690 | |
691 | /* Validate number of power states discovered */ | |
692 | if (pr->power.count < 2) | |
6d93c648 | 693 | status = -EFAULT; |
1da177e4 | 694 | |
4be44fcd | 695 | end: |
1da177e4 LT |
696 | acpi_os_free(buffer.pointer); |
697 | ||
698 | return_VALUE(status); | |
699 | } | |
700 | ||
1da177e4 LT |
701 | static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) |
702 | { | |
703 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c2"); | |
704 | ||
705 | if (!cx->address) | |
706 | return_VOID; | |
707 | ||
708 | /* | |
709 | * C2 latency must be less than or equal to 100 | |
710 | * microseconds. | |
711 | */ | |
712 | else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { | |
713 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 714 | "latency too large [%d]\n", cx->latency)); |
1da177e4 LT |
715 | return_VOID; |
716 | } | |
717 | ||
1da177e4 LT |
718 | /* |
719 | * Otherwise we've met all of our C2 requirements. | |
720 | * Normalize the C2 latency to expidite policy | |
721 | */ | |
722 | cx->valid = 1; | |
723 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); | |
724 | ||
725 | return_VOID; | |
726 | } | |
727 | ||
4be44fcd LB |
728 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
729 | struct acpi_processor_cx *cx) | |
1da177e4 | 730 | { |
02df8b93 VP |
731 | static int bm_check_flag; |
732 | ||
1da177e4 LT |
733 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c3"); |
734 | ||
735 | if (!cx->address) | |
736 | return_VOID; | |
737 | ||
738 | /* | |
739 | * C3 latency must be less than or equal to 1000 | |
740 | * microseconds. | |
741 | */ | |
742 | else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { | |
743 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 744 | "latency too large [%d]\n", cx->latency)); |
1da177e4 LT |
745 | return_VOID; |
746 | } | |
747 | ||
1da177e4 LT |
748 | /* |
749 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) | |
750 | * DMA transfers are used by any ISA device to avoid livelock. | |
751 | * Note that we could disable Type-F DMA (as recommended by | |
752 | * the erratum), but this is known to disrupt certain ISA | |
753 | * devices thus we take the conservative approach. | |
754 | */ | |
755 | else if (errata.piix4.fdma) { | |
756 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 757 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
1da177e4 LT |
758 | return_VOID; |
759 | } | |
760 | ||
02df8b93 VP |
761 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
762 | if (!bm_check_flag) { | |
763 | /* Determine whether bm_check is needed based on CPU */ | |
764 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); | |
765 | bm_check_flag = pr->flags.bm_check; | |
766 | } else { | |
767 | pr->flags.bm_check = bm_check_flag; | |
768 | } | |
769 | ||
770 | if (pr->flags.bm_check) { | |
02df8b93 VP |
771 | /* bus mastering control is necessary */ |
772 | if (!pr->flags.bm_control) { | |
773 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 774 | "C3 support requires bus mastering control\n")); |
02df8b93 VP |
775 | return_VOID; |
776 | } | |
777 | } else { | |
02df8b93 VP |
778 | /* |
779 | * WBINVD should be set in fadt, for C3 state to be | |
780 | * supported on when bm_check is not required. | |
781 | */ | |
782 | if (acpi_fadt.wb_invd != 1) { | |
783 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
784 | "Cache invalidation should work properly" |
785 | " for C3 to be enabled on SMP systems\n")); | |
02df8b93 VP |
786 | return_VOID; |
787 | } | |
788 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, | |
4be44fcd | 789 | 0, ACPI_MTX_DO_NOT_LOCK); |
02df8b93 VP |
790 | } |
791 | ||
1da177e4 LT |
792 | /* |
793 | * Otherwise we've met all of our C3 requirements. | |
794 | * Normalize the C3 latency to expidite policy. Enable | |
795 | * checking of bus mastering status (bm_check) so we can | |
796 | * use this in our C3 policy | |
797 | */ | |
798 | cx->valid = 1; | |
799 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); | |
1da177e4 LT |
800 | |
801 | return_VOID; | |
802 | } | |
803 | ||
1da177e4 LT |
804 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
805 | { | |
806 | unsigned int i; | |
807 | unsigned int working = 0; | |
808 | ||
4be44fcd | 809 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
810 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
811 | ||
812 | switch (cx->type) { | |
813 | case ACPI_STATE_C1: | |
814 | cx->valid = 1; | |
815 | break; | |
816 | ||
817 | case ACPI_STATE_C2: | |
818 | acpi_processor_power_verify_c2(cx); | |
819 | break; | |
820 | ||
821 | case ACPI_STATE_C3: | |
822 | acpi_processor_power_verify_c3(pr, cx); | |
823 | break; | |
824 | } | |
825 | ||
826 | if (cx->valid) | |
827 | working++; | |
828 | } | |
829 | ||
830 | return (working); | |
831 | } | |
832 | ||
4be44fcd | 833 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
1da177e4 LT |
834 | { |
835 | unsigned int i; | |
836 | int result; | |
837 | ||
838 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info"); | |
839 | ||
840 | /* NOTE: the idle thread may not be running while calling | |
841 | * this function */ | |
842 | ||
843 | result = acpi_processor_get_power_info_cst(pr); | |
6d93c648 | 844 | if (result == -ENODEV) |
1da177e4 | 845 | result = acpi_processor_get_power_info_fadt(pr); |
6d93c648 VP |
846 | |
847 | if ((result) || (acpi_processor_power_verify(pr) < 2)) | |
848 | result = acpi_processor_get_power_info_default_c1(pr); | |
1da177e4 LT |
849 | |
850 | /* | |
851 | * Set Default Policy | |
852 | * ------------------ | |
853 | * Now that we know which states are supported, set the default | |
854 | * policy. Note that this policy can be changed dynamically | |
855 | * (e.g. encourage deeper sleeps to conserve battery life when | |
856 | * not on AC). | |
857 | */ | |
858 | result = acpi_processor_set_power_policy(pr); | |
859 | if (result) | |
860 | return_VALUE(result); | |
861 | ||
862 | /* | |
863 | * if one state of type C2 or C3 is available, mark this | |
864 | * CPU as being "idle manageable" | |
865 | */ | |
866 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { | |
acf05f4b | 867 | if (pr->power.states[i].valid) { |
1da177e4 | 868 | pr->power.count = i; |
2203d6ed LT |
869 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
870 | pr->flags.power = 1; | |
acf05f4b | 871 | } |
1da177e4 LT |
872 | } |
873 | ||
874 | return_VALUE(0); | |
875 | } | |
876 | ||
4be44fcd | 877 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
1da177e4 | 878 | { |
4be44fcd | 879 | int result = 0; |
1da177e4 LT |
880 | |
881 | ACPI_FUNCTION_TRACE("acpi_processor_cst_has_changed"); | |
882 | ||
883 | if (!pr) | |
4be44fcd | 884 | return_VALUE(-EINVAL); |
1da177e4 | 885 | |
4be44fcd | 886 | if (nocst) { |
1da177e4 LT |
887 | return_VALUE(-ENODEV); |
888 | } | |
889 | ||
890 | if (!pr->flags.power_setup_done) | |
891 | return_VALUE(-ENODEV); | |
892 | ||
893 | /* Fall back to the default idle loop */ | |
894 | pm_idle = pm_idle_save; | |
4be44fcd | 895 | synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ |
1da177e4 LT |
896 | |
897 | pr->flags.power = 0; | |
898 | result = acpi_processor_get_power_info(pr); | |
899 | if ((pr->flags.power == 1) && (pr->flags.power_setup_done)) | |
900 | pm_idle = acpi_processor_idle; | |
901 | ||
902 | return_VALUE(result); | |
903 | } | |
904 | ||
905 | /* proc interface */ | |
906 | ||
907 | static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) | |
908 | { | |
4be44fcd LB |
909 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
910 | unsigned int i; | |
1da177e4 LT |
911 | |
912 | ACPI_FUNCTION_TRACE("acpi_processor_power_seq_show"); | |
913 | ||
914 | if (!pr) | |
915 | goto end; | |
916 | ||
917 | seq_printf(seq, "active state: C%zd\n" | |
4be44fcd LB |
918 | "max_cstate: C%d\n" |
919 | "bus master activity: %08x\n", | |
920 | pr->power.state ? pr->power.state - pr->power.states : 0, | |
921 | max_cstate, (unsigned)pr->power.bm_activity); | |
1da177e4 LT |
922 | |
923 | seq_puts(seq, "states:\n"); | |
924 | ||
925 | for (i = 1; i <= pr->power.count; i++) { | |
926 | seq_printf(seq, " %cC%d: ", | |
4be44fcd LB |
927 | (&pr->power.states[i] == |
928 | pr->power.state ? '*' : ' '), i); | |
1da177e4 LT |
929 | |
930 | if (!pr->power.states[i].valid) { | |
931 | seq_puts(seq, "<not supported>\n"); | |
932 | continue; | |
933 | } | |
934 | ||
935 | switch (pr->power.states[i].type) { | |
936 | case ACPI_STATE_C1: | |
937 | seq_printf(seq, "type[C1] "); | |
938 | break; | |
939 | case ACPI_STATE_C2: | |
940 | seq_printf(seq, "type[C2] "); | |
941 | break; | |
942 | case ACPI_STATE_C3: | |
943 | seq_printf(seq, "type[C3] "); | |
944 | break; | |
945 | default: | |
946 | seq_printf(seq, "type[--] "); | |
947 | break; | |
948 | } | |
949 | ||
950 | if (pr->power.states[i].promotion.state) | |
951 | seq_printf(seq, "promotion[C%zd] ", | |
4be44fcd LB |
952 | (pr->power.states[i].promotion.state - |
953 | pr->power.states)); | |
1da177e4 LT |
954 | else |
955 | seq_puts(seq, "promotion[--] "); | |
956 | ||
957 | if (pr->power.states[i].demotion.state) | |
958 | seq_printf(seq, "demotion[C%zd] ", | |
4be44fcd LB |
959 | (pr->power.states[i].demotion.state - |
960 | pr->power.states)); | |
1da177e4 LT |
961 | else |
962 | seq_puts(seq, "demotion[--] "); | |
963 | ||
964 | seq_printf(seq, "latency[%03d] usage[%08d]\n", | |
4be44fcd LB |
965 | pr->power.states[i].latency, |
966 | pr->power.states[i].usage); | |
1da177e4 LT |
967 | } |
968 | ||
4be44fcd | 969 | end: |
1da177e4 LT |
970 | return_VALUE(0); |
971 | } | |
972 | ||
973 | static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) | |
974 | { | |
975 | return single_open(file, acpi_processor_power_seq_show, | |
4be44fcd | 976 | PDE(inode)->data); |
1da177e4 LT |
977 | } |
978 | ||
979 | static struct file_operations acpi_processor_power_fops = { | |
4be44fcd LB |
980 | .open = acpi_processor_power_open_fs, |
981 | .read = seq_read, | |
982 | .llseek = seq_lseek, | |
983 | .release = single_release, | |
1da177e4 LT |
984 | }; |
985 | ||
4be44fcd LB |
986 | int acpi_processor_power_init(struct acpi_processor *pr, |
987 | struct acpi_device *device) | |
1da177e4 | 988 | { |
4be44fcd LB |
989 | acpi_status status = 0; |
990 | static int first_run = 0; | |
991 | struct proc_dir_entry *entry = NULL; | |
1da177e4 LT |
992 | unsigned int i; |
993 | ||
994 | ACPI_FUNCTION_TRACE("acpi_processor_power_init"); | |
995 | ||
996 | if (!first_run) { | |
997 | dmi_check_system(processor_power_dmi_table); | |
998 | if (max_cstate < ACPI_C_STATES_MAX) | |
4be44fcd LB |
999 | printk(KERN_NOTICE |
1000 | "ACPI: processor limited to max C-state %d\n", | |
1001 | max_cstate); | |
1da177e4 LT |
1002 | first_run++; |
1003 | } | |
1004 | ||
02df8b93 VP |
1005 | if (!pr) |
1006 | return_VALUE(-EINVAL); | |
1007 | ||
1008 | if (acpi_fadt.cst_cnt && !nocst) { | |
4be44fcd LB |
1009 | status = |
1010 | acpi_os_write_port(acpi_fadt.smi_cmd, acpi_fadt.cst_cnt, 8); | |
1da177e4 LT |
1011 | if (ACPI_FAILURE(status)) { |
1012 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
1013 | "Notifying BIOS of _CST ability failed\n")); | |
1014 | } | |
1015 | } | |
1016 | ||
02df8b93 VP |
1017 | acpi_processor_power_init_pdc(&(pr->power), pr->id); |
1018 | acpi_processor_set_pdc(pr, pr->power.pdc); | |
1da177e4 LT |
1019 | acpi_processor_get_power_info(pr); |
1020 | ||
1021 | /* | |
1022 | * Install the idle handler if processor power management is supported. | |
1023 | * Note that we use previously set idle handler will be used on | |
1024 | * platforms that only support C1. | |
1025 | */ | |
1026 | if ((pr->flags.power) && (!boot_option_idle_override)) { | |
1027 | printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); | |
1028 | for (i = 1; i <= pr->power.count; i++) | |
1029 | if (pr->power.states[i].valid) | |
4be44fcd LB |
1030 | printk(" C%d[C%d]", i, |
1031 | pr->power.states[i].type); | |
1da177e4 LT |
1032 | printk(")\n"); |
1033 | ||
1034 | if (pr->id == 0) { | |
1035 | pm_idle_save = pm_idle; | |
1036 | pm_idle = acpi_processor_idle; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | /* 'power' [R] */ | |
1041 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, | |
4be44fcd | 1042 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 LT |
1043 | if (!entry) |
1044 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
1045 | "Unable to create '%s' fs entry\n", |
1046 | ACPI_PROCESSOR_FILE_POWER)); | |
1da177e4 LT |
1047 | else { |
1048 | entry->proc_fops = &acpi_processor_power_fops; | |
1049 | entry->data = acpi_driver_data(device); | |
1050 | entry->owner = THIS_MODULE; | |
1051 | } | |
1052 | ||
1053 | pr->flags.power_setup_done = 1; | |
1054 | ||
1055 | return_VALUE(0); | |
1056 | } | |
1057 | ||
4be44fcd LB |
1058 | int acpi_processor_power_exit(struct acpi_processor *pr, |
1059 | struct acpi_device *device) | |
1da177e4 LT |
1060 | { |
1061 | ACPI_FUNCTION_TRACE("acpi_processor_power_exit"); | |
1062 | ||
1063 | pr->flags.power_setup_done = 0; | |
1064 | ||
1065 | if (acpi_device_dir(device)) | |
4be44fcd LB |
1066 | remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
1067 | acpi_device_dir(device)); | |
1da177e4 LT |
1068 | |
1069 | /* Unregister the idle handler when processor #0 is removed. */ | |
1070 | if (pr->id == 0) { | |
1071 | pm_idle = pm_idle_save; | |
1072 | ||
1073 | /* | |
1074 | * We are about to unload the current idle thread pm callback | |
1075 | * (pm_idle), Wait for all processors to update cached/local | |
1076 | * copies of pm_idle before proceeding. | |
1077 | */ | |
1078 | cpu_idle_wait(); | |
1079 | } | |
1080 | ||
1081 | return_VALUE(0); | |
1082 | } |