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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 | { | |
2a298a35 NP |
172 | clear_thread_flag(TIF_POLLING_NRFLAG); |
173 | smp_mb__after_clear_bit(); | |
64c7c8f8 NP |
174 | if (!need_resched()) |
175 | safe_halt(); | |
2a298a35 | 176 | set_thread_flag(TIF_POLLING_NRFLAG); |
64c7c8f8 NP |
177 | } |
178 | ||
4be44fcd | 179 | static atomic_t c3_cpu_count; |
1da177e4 | 180 | |
4be44fcd | 181 | static void acpi_processor_idle(void) |
1da177e4 | 182 | { |
4be44fcd | 183 | struct acpi_processor *pr = NULL; |
1da177e4 LT |
184 | struct acpi_processor_cx *cx = NULL; |
185 | struct acpi_processor_cx *next_state = NULL; | |
4be44fcd LB |
186 | int sleep_ticks = 0; |
187 | u32 t1, t2 = 0; | |
1da177e4 | 188 | |
64c7c8f8 | 189 | pr = processors[smp_processor_id()]; |
1da177e4 LT |
190 | if (!pr) |
191 | return; | |
192 | ||
193 | /* | |
194 | * Interrupts must be disabled during bus mastering calculations and | |
195 | * for C2/C3 transitions. | |
196 | */ | |
197 | local_irq_disable(); | |
198 | ||
199 | /* | |
200 | * Check whether we truly need to go idle, or should | |
201 | * reschedule: | |
202 | */ | |
203 | if (unlikely(need_resched())) { | |
204 | local_irq_enable(); | |
205 | return; | |
206 | } | |
207 | ||
208 | cx = pr->power.state; | |
64c7c8f8 NP |
209 | if (!cx) { |
210 | if (pm_idle_save) | |
211 | pm_idle_save(); | |
212 | else | |
213 | acpi_safe_halt(); | |
214 | return; | |
215 | } | |
1da177e4 LT |
216 | |
217 | /* | |
218 | * Check BM Activity | |
219 | * ----------------- | |
220 | * Check for bus mastering activity (if required), record, and check | |
221 | * for demotion. | |
222 | */ | |
223 | if (pr->flags.bm_check) { | |
4be44fcd LB |
224 | u32 bm_status = 0; |
225 | unsigned long diff = jiffies - pr->power.bm_check_timestamp; | |
1da177e4 LT |
226 | |
227 | if (diff > 32) | |
228 | diff = 32; | |
229 | ||
230 | while (diff) { | |
231 | /* if we didn't get called, assume there was busmaster activity */ | |
232 | diff--; | |
233 | if (diff) | |
234 | pr->power.bm_activity |= 0x1; | |
235 | pr->power.bm_activity <<= 1; | |
236 | } | |
237 | ||
238 | acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, | |
4be44fcd | 239 | &bm_status, ACPI_MTX_DO_NOT_LOCK); |
1da177e4 LT |
240 | if (bm_status) { |
241 | pr->power.bm_activity++; | |
242 | acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, | |
4be44fcd | 243 | 1, ACPI_MTX_DO_NOT_LOCK); |
1da177e4 LT |
244 | } |
245 | /* | |
246 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect | |
247 | * the true state of bus mastering activity; forcing us to | |
248 | * manually check the BMIDEA bit of each IDE channel. | |
249 | */ | |
250 | else if (errata.piix4.bmisx) { | |
251 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) | |
4be44fcd | 252 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
1da177e4 LT |
253 | pr->power.bm_activity++; |
254 | } | |
255 | ||
256 | pr->power.bm_check_timestamp = jiffies; | |
257 | ||
258 | /* | |
259 | * Apply bus mastering demotion policy. Automatically demote | |
260 | * to avoid a faulty transition. Note that the processor | |
261 | * won't enter a low-power state during this call (to this | |
262 | * funciton) but should upon the next. | |
263 | * | |
264 | * TBD: A better policy might be to fallback to the demotion | |
265 | * state (use it for this quantum only) istead of | |
266 | * demoting -- and rely on duration as our sole demotion | |
267 | * qualification. This may, however, introduce DMA | |
268 | * issues (e.g. floppy DMA transfer overrun/underrun). | |
269 | */ | |
270 | if (pr->power.bm_activity & cx->demotion.threshold.bm) { | |
271 | local_irq_enable(); | |
272 | next_state = cx->demotion.state; | |
273 | goto end; | |
274 | } | |
275 | } | |
276 | ||
4c033552 VP |
277 | #ifdef CONFIG_HOTPLUG_CPU |
278 | /* | |
279 | * Check for P_LVL2_UP flag before entering C2 and above on | |
280 | * an SMP system. We do it here instead of doing it at _CST/P_LVL | |
281 | * detection phase, to work cleanly with logical CPU hotplug. | |
282 | */ | |
283 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && | |
1e483969 DSL |
284 | !pr->flags.has_cst && !acpi_fadt.plvl2_up) |
285 | cx = &pr->power.states[ACPI_STATE_C1]; | |
4c033552 | 286 | #endif |
1e483969 DSL |
287 | |
288 | cx->usage++; | |
289 | ||
1da177e4 LT |
290 | /* |
291 | * Sleep: | |
292 | * ------ | |
293 | * Invoke the current Cx state to put the processor to sleep. | |
294 | */ | |
2a298a35 NP |
295 | if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) { |
296 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
297 | smp_mb__after_clear_bit(); | |
298 | if (need_resched()) { | |
299 | set_thread_flag(TIF_POLLING_NRFLAG); | |
af2eb17b | 300 | local_irq_enable(); |
2a298a35 NP |
301 | return; |
302 | } | |
303 | } | |
304 | ||
1da177e4 LT |
305 | switch (cx->type) { |
306 | ||
307 | case ACPI_STATE_C1: | |
308 | /* | |
309 | * Invoke C1. | |
310 | * Use the appropriate idle routine, the one that would | |
311 | * be used without acpi C-states. | |
312 | */ | |
313 | if (pm_idle_save) | |
314 | pm_idle_save(); | |
315 | else | |
64c7c8f8 NP |
316 | acpi_safe_halt(); |
317 | ||
1da177e4 | 318 | /* |
4be44fcd | 319 | * TBD: Can't get time duration while in C1, as resumes |
1da177e4 LT |
320 | * go to an ISR rather than here. Need to instrument |
321 | * base interrupt handler. | |
322 | */ | |
323 | sleep_ticks = 0xFFFFFFFF; | |
324 | break; | |
325 | ||
326 | case ACPI_STATE_C2: | |
327 | /* Get start time (ticks) */ | |
328 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); | |
329 | /* Invoke C2 */ | |
330 | inb(cx->address); | |
331 | /* Dummy op - must do something useless after P_LVL2 read */ | |
332 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
333 | /* Get end time (ticks) */ | |
334 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
335 | /* Re-enable interrupts */ | |
336 | local_irq_enable(); | |
2a298a35 | 337 | set_thread_flag(TIF_POLLING_NRFLAG); |
1da177e4 | 338 | /* Compute time (ticks) that we were actually asleep */ |
4be44fcd LB |
339 | sleep_ticks = |
340 | ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD; | |
1da177e4 LT |
341 | break; |
342 | ||
343 | case ACPI_STATE_C3: | |
4be44fcd | 344 | |
02df8b93 VP |
345 | if (pr->flags.bm_check) { |
346 | if (atomic_inc_return(&c3_cpu_count) == | |
4be44fcd | 347 | num_online_cpus()) { |
02df8b93 VP |
348 | /* |
349 | * All CPUs are trying to go to C3 | |
350 | * Disable bus master arbitration | |
351 | */ | |
352 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1, | |
4be44fcd | 353 | ACPI_MTX_DO_NOT_LOCK); |
02df8b93 VP |
354 | } |
355 | } else { | |
356 | /* SMP with no shared cache... Invalidate cache */ | |
357 | ACPI_FLUSH_CPU_CACHE(); | |
358 | } | |
4be44fcd | 359 | |
1da177e4 LT |
360 | /* Get start time (ticks) */ |
361 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); | |
362 | /* Invoke C3 */ | |
363 | inb(cx->address); | |
364 | /* Dummy op - must do something useless after P_LVL3 read */ | |
365 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
366 | /* Get end time (ticks) */ | |
367 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
02df8b93 VP |
368 | if (pr->flags.bm_check) { |
369 | /* Enable bus master arbitration */ | |
370 | atomic_dec(&c3_cpu_count); | |
4be44fcd LB |
371 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, |
372 | ACPI_MTX_DO_NOT_LOCK); | |
02df8b93 VP |
373 | } |
374 | ||
1da177e4 LT |
375 | /* Re-enable interrupts */ |
376 | local_irq_enable(); | |
2a298a35 | 377 | set_thread_flag(TIF_POLLING_NRFLAG); |
1da177e4 | 378 | /* Compute time (ticks) that we were actually asleep */ |
4be44fcd LB |
379 | sleep_ticks = |
380 | ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD; | |
1da177e4 LT |
381 | break; |
382 | ||
383 | default: | |
384 | local_irq_enable(); | |
385 | return; | |
386 | } | |
387 | ||
388 | next_state = pr->power.state; | |
389 | ||
1e483969 DSL |
390 | #ifdef CONFIG_HOTPLUG_CPU |
391 | /* Don't do promotion/demotion */ | |
392 | if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) && | |
393 | !pr->flags.has_cst && !acpi_fadt.plvl2_up) { | |
394 | next_state = cx; | |
395 | goto end; | |
396 | } | |
397 | #endif | |
398 | ||
1da177e4 LT |
399 | /* |
400 | * Promotion? | |
401 | * ---------- | |
402 | * Track the number of longs (time asleep is greater than threshold) | |
403 | * and promote when the count threshold is reached. Note that bus | |
404 | * mastering activity may prevent promotions. | |
405 | * Do not promote above max_cstate. | |
406 | */ | |
407 | if (cx->promotion.state && | |
408 | ((cx->promotion.state - pr->power.states) <= max_cstate)) { | |
409 | if (sleep_ticks > cx->promotion.threshold.ticks) { | |
410 | cx->promotion.count++; | |
4be44fcd LB |
411 | cx->demotion.count = 0; |
412 | if (cx->promotion.count >= | |
413 | cx->promotion.threshold.count) { | |
1da177e4 | 414 | if (pr->flags.bm_check) { |
4be44fcd LB |
415 | if (! |
416 | (pr->power.bm_activity & cx-> | |
417 | promotion.threshold.bm)) { | |
418 | next_state = | |
419 | cx->promotion.state; | |
1da177e4 LT |
420 | goto end; |
421 | } | |
4be44fcd | 422 | } else { |
1da177e4 LT |
423 | next_state = cx->promotion.state; |
424 | goto end; | |
425 | } | |
426 | } | |
427 | } | |
428 | } | |
429 | ||
430 | /* | |
431 | * Demotion? | |
432 | * --------- | |
433 | * Track the number of shorts (time asleep is less than time threshold) | |
434 | * and demote when the usage threshold is reached. | |
435 | */ | |
436 | if (cx->demotion.state) { | |
437 | if (sleep_ticks < cx->demotion.threshold.ticks) { | |
438 | cx->demotion.count++; | |
439 | cx->promotion.count = 0; | |
440 | if (cx->demotion.count >= cx->demotion.threshold.count) { | |
441 | next_state = cx->demotion.state; | |
442 | goto end; | |
443 | } | |
444 | } | |
445 | } | |
446 | ||
4be44fcd | 447 | end: |
1da177e4 LT |
448 | /* |
449 | * Demote if current state exceeds max_cstate | |
450 | */ | |
451 | if ((pr->power.state - pr->power.states) > max_cstate) { | |
452 | if (cx->demotion.state) | |
453 | next_state = cx->demotion.state; | |
454 | } | |
455 | ||
456 | /* | |
457 | * New Cx State? | |
458 | * ------------- | |
459 | * If we're going to start using a new Cx state we must clean up | |
460 | * from the previous and prepare to use the new. | |
461 | */ | |
462 | if (next_state != pr->power.state) | |
463 | acpi_processor_power_activate(pr, next_state); | |
1da177e4 LT |
464 | } |
465 | ||
4be44fcd | 466 | static int acpi_processor_set_power_policy(struct acpi_processor *pr) |
1da177e4 LT |
467 | { |
468 | unsigned int i; | |
469 | unsigned int state_is_set = 0; | |
470 | struct acpi_processor_cx *lower = NULL; | |
471 | struct acpi_processor_cx *higher = NULL; | |
472 | struct acpi_processor_cx *cx; | |
473 | ||
4be44fcd | 474 | ACPI_FUNCTION_TRACE("acpi_processor_set_power_policy"); |
1da177e4 LT |
475 | |
476 | if (!pr) | |
477 | return_VALUE(-EINVAL); | |
478 | ||
479 | /* | |
480 | * This function sets the default Cx state policy (OS idle handler). | |
481 | * Our scheme is to promote quickly to C2 but more conservatively | |
482 | * to C3. We're favoring C2 for its characteristics of low latency | |
483 | * (quick response), good power savings, and ability to allow bus | |
484 | * mastering activity. Note that the Cx state policy is completely | |
485 | * customizable and can be altered dynamically. | |
486 | */ | |
487 | ||
488 | /* startup state */ | |
4be44fcd | 489 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
490 | cx = &pr->power.states[i]; |
491 | if (!cx->valid) | |
492 | continue; | |
493 | ||
494 | if (!state_is_set) | |
495 | pr->power.state = cx; | |
496 | state_is_set++; | |
497 | break; | |
4be44fcd | 498 | } |
1da177e4 LT |
499 | |
500 | if (!state_is_set) | |
501 | return_VALUE(-ENODEV); | |
502 | ||
503 | /* demotion */ | |
4be44fcd | 504 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
505 | cx = &pr->power.states[i]; |
506 | if (!cx->valid) | |
507 | continue; | |
508 | ||
509 | if (lower) { | |
510 | cx->demotion.state = lower; | |
511 | cx->demotion.threshold.ticks = cx->latency_ticks; | |
512 | cx->demotion.threshold.count = 1; | |
513 | if (cx->type == ACPI_STATE_C3) | |
514 | cx->demotion.threshold.bm = bm_history; | |
515 | } | |
516 | ||
517 | lower = cx; | |
518 | } | |
519 | ||
520 | /* promotion */ | |
521 | for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) { | |
522 | cx = &pr->power.states[i]; | |
523 | if (!cx->valid) | |
524 | continue; | |
525 | ||
526 | if (higher) { | |
4be44fcd | 527 | cx->promotion.state = higher; |
1da177e4 LT |
528 | cx->promotion.threshold.ticks = cx->latency_ticks; |
529 | if (cx->type >= ACPI_STATE_C2) | |
530 | cx->promotion.threshold.count = 4; | |
531 | else | |
532 | cx->promotion.threshold.count = 10; | |
533 | if (higher->type == ACPI_STATE_C3) | |
534 | cx->promotion.threshold.bm = bm_history; | |
535 | } | |
536 | ||
537 | higher = cx; | |
538 | } | |
539 | ||
4be44fcd | 540 | return_VALUE(0); |
1da177e4 LT |
541 | } |
542 | ||
4be44fcd | 543 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
1da177e4 | 544 | { |
1da177e4 LT |
545 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_fadt"); |
546 | ||
547 | if (!pr) | |
548 | return_VALUE(-EINVAL); | |
549 | ||
550 | if (!pr->pblk) | |
551 | return_VALUE(-ENODEV); | |
552 | ||
2203d6ed | 553 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
1da177e4 LT |
554 | |
555 | /* if info is obtained from pblk/fadt, type equals state */ | |
556 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; | |
557 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; | |
558 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; | |
559 | ||
560 | /* the C0 state only exists as a filler in our array, | |
561 | * and all processors need to support C1 */ | |
562 | pr->power.states[ACPI_STATE_C0].valid = 1; | |
563 | pr->power.states[ACPI_STATE_C1].valid = 1; | |
564 | ||
4c033552 VP |
565 | #ifndef CONFIG_HOTPLUG_CPU |
566 | /* | |
567 | * Check for P_LVL2_UP flag before entering C2 and above on | |
568 | * an SMP system. | |
569 | */ | |
1e483969 | 570 | if ((num_online_cpus() > 1) && !acpi_fadt.plvl2_up) |
4c033552 VP |
571 | return_VALUE(-ENODEV); |
572 | #endif | |
573 | ||
1da177e4 LT |
574 | /* determine C2 and C3 address from pblk */ |
575 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; | |
576 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; | |
577 | ||
578 | /* determine latencies from FADT */ | |
579 | pr->power.states[ACPI_STATE_C2].latency = acpi_fadt.plvl2_lat; | |
580 | pr->power.states[ACPI_STATE_C3].latency = acpi_fadt.plvl3_lat; | |
581 | ||
582 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
583 | "lvl2[0x%08x] lvl3[0x%08x]\n", | |
584 | pr->power.states[ACPI_STATE_C2].address, | |
585 | pr->power.states[ACPI_STATE_C3].address)); | |
586 | ||
587 | return_VALUE(0); | |
588 | } | |
589 | ||
4be44fcd | 590 | static int acpi_processor_get_power_info_default_c1(struct acpi_processor *pr) |
acf05f4b | 591 | { |
acf05f4b VP |
592 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_default_c1"); |
593 | ||
2203d6ed | 594 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
acf05f4b VP |
595 | |
596 | /* if info is obtained from pblk/fadt, type equals state */ | |
597 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; | |
598 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; | |
599 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; | |
600 | ||
601 | /* the C0 state only exists as a filler in our array, | |
602 | * and all processors need to support C1 */ | |
603 | pr->power.states[ACPI_STATE_C0].valid = 1; | |
604 | pr->power.states[ACPI_STATE_C1].valid = 1; | |
605 | ||
606 | return_VALUE(0); | |
607 | } | |
608 | ||
4be44fcd | 609 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
1da177e4 | 610 | { |
4be44fcd LB |
611 | acpi_status status = 0; |
612 | acpi_integer count; | |
613 | int i; | |
614 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
615 | union acpi_object *cst; | |
1da177e4 LT |
616 | |
617 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_cst"); | |
618 | ||
1da177e4 LT |
619 | if (nocst) |
620 | return_VALUE(-ENODEV); | |
621 | ||
622 | pr->power.count = 0; | |
623 | for (i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++) | |
4be44fcd | 624 | memset(&(pr->power.states[i]), 0, |
0b6b2f08 | 625 | sizeof(struct acpi_processor_cx)); |
1da177e4 LT |
626 | |
627 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); | |
628 | if (ACPI_FAILURE(status)) { | |
629 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); | |
630 | return_VALUE(-ENODEV); | |
4be44fcd | 631 | } |
1da177e4 | 632 | |
4be44fcd | 633 | cst = (union acpi_object *)buffer.pointer; |
1da177e4 LT |
634 | |
635 | /* There must be at least 2 elements */ | |
636 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { | |
4be44fcd LB |
637 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
638 | "not enough elements in _CST\n")); | |
1da177e4 LT |
639 | status = -EFAULT; |
640 | goto end; | |
641 | } | |
642 | ||
643 | count = cst->package.elements[0].integer.value; | |
644 | ||
645 | /* Validate number of power states. */ | |
646 | if (count < 1 || count != cst->package.count - 1) { | |
4be44fcd LB |
647 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
648 | "count given by _CST is not valid\n")); | |
1da177e4 LT |
649 | status = -EFAULT; |
650 | goto end; | |
651 | } | |
652 | ||
653 | /* We support up to ACPI_PROCESSOR_MAX_POWER. */ | |
654 | if (count > ACPI_PROCESSOR_MAX_POWER) { | |
4be44fcd LB |
655 | printk(KERN_WARNING |
656 | "Limiting number of power states to max (%d)\n", | |
657 | ACPI_PROCESSOR_MAX_POWER); | |
658 | printk(KERN_WARNING | |
659 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); | |
1da177e4 LT |
660 | count = ACPI_PROCESSOR_MAX_POWER; |
661 | } | |
662 | ||
663 | /* Tell driver that at least _CST is supported. */ | |
664 | pr->flags.has_cst = 1; | |
665 | ||
666 | for (i = 1; i <= count; i++) { | |
667 | union acpi_object *element; | |
668 | union acpi_object *obj; | |
669 | struct acpi_power_register *reg; | |
670 | struct acpi_processor_cx cx; | |
671 | ||
672 | memset(&cx, 0, sizeof(cx)); | |
673 | ||
4be44fcd | 674 | element = (union acpi_object *)&(cst->package.elements[i]); |
1da177e4 LT |
675 | if (element->type != ACPI_TYPE_PACKAGE) |
676 | continue; | |
677 | ||
678 | if (element->package.count != 4) | |
679 | continue; | |
680 | ||
4be44fcd | 681 | obj = (union acpi_object *)&(element->package.elements[0]); |
1da177e4 LT |
682 | |
683 | if (obj->type != ACPI_TYPE_BUFFER) | |
684 | continue; | |
685 | ||
4be44fcd | 686 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
1da177e4 LT |
687 | |
688 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && | |
4be44fcd | 689 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
1da177e4 LT |
690 | continue; |
691 | ||
692 | cx.address = (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) ? | |
4be44fcd | 693 | 0 : reg->address; |
1da177e4 LT |
694 | |
695 | /* There should be an easy way to extract an integer... */ | |
4be44fcd | 696 | obj = (union acpi_object *)&(element->package.elements[1]); |
1da177e4 LT |
697 | if (obj->type != ACPI_TYPE_INTEGER) |
698 | continue; | |
699 | ||
700 | cx.type = obj->integer.value; | |
701 | ||
702 | if ((cx.type != ACPI_STATE_C1) && | |
703 | (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO)) | |
704 | continue; | |
705 | ||
4be44fcd | 706 | if ((cx.type < ACPI_STATE_C1) || (cx.type > ACPI_STATE_C3)) |
1da177e4 LT |
707 | continue; |
708 | ||
4be44fcd | 709 | obj = (union acpi_object *)&(element->package.elements[2]); |
1da177e4 LT |
710 | if (obj->type != ACPI_TYPE_INTEGER) |
711 | continue; | |
712 | ||
713 | cx.latency = obj->integer.value; | |
714 | ||
4be44fcd | 715 | obj = (union acpi_object *)&(element->package.elements[3]); |
1da177e4 LT |
716 | if (obj->type != ACPI_TYPE_INTEGER) |
717 | continue; | |
718 | ||
719 | cx.power = obj->integer.value; | |
720 | ||
721 | (pr->power.count)++; | |
722 | memcpy(&(pr->power.states[pr->power.count]), &cx, sizeof(cx)); | |
723 | } | |
724 | ||
4be44fcd LB |
725 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
726 | pr->power.count)); | |
1da177e4 LT |
727 | |
728 | /* Validate number of power states discovered */ | |
729 | if (pr->power.count < 2) | |
6d93c648 | 730 | status = -EFAULT; |
1da177e4 | 731 | |
4be44fcd | 732 | end: |
1da177e4 LT |
733 | acpi_os_free(buffer.pointer); |
734 | ||
735 | return_VALUE(status); | |
736 | } | |
737 | ||
1da177e4 LT |
738 | static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) |
739 | { | |
740 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c2"); | |
741 | ||
742 | if (!cx->address) | |
743 | return_VOID; | |
744 | ||
745 | /* | |
746 | * C2 latency must be less than or equal to 100 | |
747 | * microseconds. | |
748 | */ | |
749 | else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { | |
750 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 751 | "latency too large [%d]\n", cx->latency)); |
1da177e4 LT |
752 | return_VOID; |
753 | } | |
754 | ||
1da177e4 LT |
755 | /* |
756 | * Otherwise we've met all of our C2 requirements. | |
757 | * Normalize the C2 latency to expidite policy | |
758 | */ | |
759 | cx->valid = 1; | |
760 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); | |
761 | ||
762 | return_VOID; | |
763 | } | |
764 | ||
4be44fcd LB |
765 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
766 | struct acpi_processor_cx *cx) | |
1da177e4 | 767 | { |
02df8b93 VP |
768 | static int bm_check_flag; |
769 | ||
1da177e4 LT |
770 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c3"); |
771 | ||
772 | if (!cx->address) | |
773 | return_VOID; | |
774 | ||
775 | /* | |
776 | * C3 latency must be less than or equal to 1000 | |
777 | * microseconds. | |
778 | */ | |
779 | else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { | |
780 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 781 | "latency too large [%d]\n", cx->latency)); |
1da177e4 LT |
782 | return_VOID; |
783 | } | |
784 | ||
1da177e4 LT |
785 | /* |
786 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) | |
787 | * DMA transfers are used by any ISA device to avoid livelock. | |
788 | * Note that we could disable Type-F DMA (as recommended by | |
789 | * the erratum), but this is known to disrupt certain ISA | |
790 | * devices thus we take the conservative approach. | |
791 | */ | |
792 | else if (errata.piix4.fdma) { | |
793 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 794 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
1da177e4 LT |
795 | return_VOID; |
796 | } | |
797 | ||
02df8b93 VP |
798 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
799 | if (!bm_check_flag) { | |
800 | /* Determine whether bm_check is needed based on CPU */ | |
801 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); | |
802 | bm_check_flag = pr->flags.bm_check; | |
803 | } else { | |
804 | pr->flags.bm_check = bm_check_flag; | |
805 | } | |
806 | ||
807 | if (pr->flags.bm_check) { | |
02df8b93 VP |
808 | /* bus mastering control is necessary */ |
809 | if (!pr->flags.bm_control) { | |
810 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 811 | "C3 support requires bus mastering control\n")); |
02df8b93 VP |
812 | return_VOID; |
813 | } | |
814 | } else { | |
02df8b93 VP |
815 | /* |
816 | * WBINVD should be set in fadt, for C3 state to be | |
817 | * supported on when bm_check is not required. | |
818 | */ | |
819 | if (acpi_fadt.wb_invd != 1) { | |
820 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
821 | "Cache invalidation should work properly" |
822 | " for C3 to be enabled on SMP systems\n")); | |
02df8b93 VP |
823 | return_VOID; |
824 | } | |
825 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, | |
4be44fcd | 826 | 0, ACPI_MTX_DO_NOT_LOCK); |
02df8b93 VP |
827 | } |
828 | ||
1da177e4 LT |
829 | /* |
830 | * Otherwise we've met all of our C3 requirements. | |
831 | * Normalize the C3 latency to expidite policy. Enable | |
832 | * checking of bus mastering status (bm_check) so we can | |
833 | * use this in our C3 policy | |
834 | */ | |
835 | cx->valid = 1; | |
836 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); | |
1da177e4 LT |
837 | |
838 | return_VOID; | |
839 | } | |
840 | ||
1da177e4 LT |
841 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
842 | { | |
843 | unsigned int i; | |
844 | unsigned int working = 0; | |
845 | ||
4be44fcd | 846 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
847 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
848 | ||
849 | switch (cx->type) { | |
850 | case ACPI_STATE_C1: | |
851 | cx->valid = 1; | |
852 | break; | |
853 | ||
854 | case ACPI_STATE_C2: | |
855 | acpi_processor_power_verify_c2(cx); | |
856 | break; | |
857 | ||
858 | case ACPI_STATE_C3: | |
859 | acpi_processor_power_verify_c3(pr, cx); | |
860 | break; | |
861 | } | |
862 | ||
863 | if (cx->valid) | |
864 | working++; | |
865 | } | |
866 | ||
867 | return (working); | |
868 | } | |
869 | ||
4be44fcd | 870 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
1da177e4 LT |
871 | { |
872 | unsigned int i; | |
873 | int result; | |
874 | ||
875 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info"); | |
876 | ||
877 | /* NOTE: the idle thread may not be running while calling | |
878 | * this function */ | |
879 | ||
880 | result = acpi_processor_get_power_info_cst(pr); | |
6d93c648 | 881 | if (result == -ENODEV) |
1da177e4 | 882 | result = acpi_processor_get_power_info_fadt(pr); |
6d93c648 VP |
883 | |
884 | if ((result) || (acpi_processor_power_verify(pr) < 2)) | |
885 | result = acpi_processor_get_power_info_default_c1(pr); | |
1da177e4 LT |
886 | |
887 | /* | |
888 | * Set Default Policy | |
889 | * ------------------ | |
890 | * Now that we know which states are supported, set the default | |
891 | * policy. Note that this policy can be changed dynamically | |
892 | * (e.g. encourage deeper sleeps to conserve battery life when | |
893 | * not on AC). | |
894 | */ | |
895 | result = acpi_processor_set_power_policy(pr); | |
896 | if (result) | |
897 | return_VALUE(result); | |
898 | ||
899 | /* | |
900 | * if one state of type C2 or C3 is available, mark this | |
901 | * CPU as being "idle manageable" | |
902 | */ | |
903 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { | |
acf05f4b | 904 | if (pr->power.states[i].valid) { |
1da177e4 | 905 | pr->power.count = i; |
2203d6ed LT |
906 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
907 | pr->flags.power = 1; | |
acf05f4b | 908 | } |
1da177e4 LT |
909 | } |
910 | ||
911 | return_VALUE(0); | |
912 | } | |
913 | ||
4be44fcd | 914 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
1da177e4 | 915 | { |
4be44fcd | 916 | int result = 0; |
1da177e4 LT |
917 | |
918 | ACPI_FUNCTION_TRACE("acpi_processor_cst_has_changed"); | |
919 | ||
920 | if (!pr) | |
4be44fcd | 921 | return_VALUE(-EINVAL); |
1da177e4 | 922 | |
4be44fcd | 923 | if (nocst) { |
1da177e4 LT |
924 | return_VALUE(-ENODEV); |
925 | } | |
926 | ||
927 | if (!pr->flags.power_setup_done) | |
928 | return_VALUE(-ENODEV); | |
929 | ||
930 | /* Fall back to the default idle loop */ | |
931 | pm_idle = pm_idle_save; | |
4be44fcd | 932 | synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ |
1da177e4 LT |
933 | |
934 | pr->flags.power = 0; | |
935 | result = acpi_processor_get_power_info(pr); | |
936 | if ((pr->flags.power == 1) && (pr->flags.power_setup_done)) | |
937 | pm_idle = acpi_processor_idle; | |
938 | ||
939 | return_VALUE(result); | |
940 | } | |
941 | ||
942 | /* proc interface */ | |
943 | ||
944 | static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) | |
945 | { | |
4be44fcd LB |
946 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
947 | unsigned int i; | |
1da177e4 LT |
948 | |
949 | ACPI_FUNCTION_TRACE("acpi_processor_power_seq_show"); | |
950 | ||
951 | if (!pr) | |
952 | goto end; | |
953 | ||
954 | seq_printf(seq, "active state: C%zd\n" | |
4be44fcd LB |
955 | "max_cstate: C%d\n" |
956 | "bus master activity: %08x\n", | |
957 | pr->power.state ? pr->power.state - pr->power.states : 0, | |
958 | max_cstate, (unsigned)pr->power.bm_activity); | |
1da177e4 LT |
959 | |
960 | seq_puts(seq, "states:\n"); | |
961 | ||
962 | for (i = 1; i <= pr->power.count; i++) { | |
963 | seq_printf(seq, " %cC%d: ", | |
4be44fcd LB |
964 | (&pr->power.states[i] == |
965 | pr->power.state ? '*' : ' '), i); | |
1da177e4 LT |
966 | |
967 | if (!pr->power.states[i].valid) { | |
968 | seq_puts(seq, "<not supported>\n"); | |
969 | continue; | |
970 | } | |
971 | ||
972 | switch (pr->power.states[i].type) { | |
973 | case ACPI_STATE_C1: | |
974 | seq_printf(seq, "type[C1] "); | |
975 | break; | |
976 | case ACPI_STATE_C2: | |
977 | seq_printf(seq, "type[C2] "); | |
978 | break; | |
979 | case ACPI_STATE_C3: | |
980 | seq_printf(seq, "type[C3] "); | |
981 | break; | |
982 | default: | |
983 | seq_printf(seq, "type[--] "); | |
984 | break; | |
985 | } | |
986 | ||
987 | if (pr->power.states[i].promotion.state) | |
988 | seq_printf(seq, "promotion[C%zd] ", | |
4be44fcd LB |
989 | (pr->power.states[i].promotion.state - |
990 | pr->power.states)); | |
1da177e4 LT |
991 | else |
992 | seq_puts(seq, "promotion[--] "); | |
993 | ||
994 | if (pr->power.states[i].demotion.state) | |
995 | seq_printf(seq, "demotion[C%zd] ", | |
4be44fcd LB |
996 | (pr->power.states[i].demotion.state - |
997 | pr->power.states)); | |
1da177e4 LT |
998 | else |
999 | seq_puts(seq, "demotion[--] "); | |
1000 | ||
1001 | seq_printf(seq, "latency[%03d] usage[%08d]\n", | |
4be44fcd LB |
1002 | pr->power.states[i].latency, |
1003 | pr->power.states[i].usage); | |
1da177e4 LT |
1004 | } |
1005 | ||
4be44fcd | 1006 | end: |
1da177e4 LT |
1007 | return_VALUE(0); |
1008 | } | |
1009 | ||
1010 | static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) | |
1011 | { | |
1012 | return single_open(file, acpi_processor_power_seq_show, | |
4be44fcd | 1013 | PDE(inode)->data); |
1da177e4 LT |
1014 | } |
1015 | ||
1016 | static struct file_operations acpi_processor_power_fops = { | |
4be44fcd LB |
1017 | .open = acpi_processor_power_open_fs, |
1018 | .read = seq_read, | |
1019 | .llseek = seq_lseek, | |
1020 | .release = single_release, | |
1da177e4 LT |
1021 | }; |
1022 | ||
4be44fcd LB |
1023 | int acpi_processor_power_init(struct acpi_processor *pr, |
1024 | struct acpi_device *device) | |
1da177e4 | 1025 | { |
4be44fcd LB |
1026 | acpi_status status = 0; |
1027 | static int first_run = 0; | |
1028 | struct proc_dir_entry *entry = NULL; | |
1da177e4 LT |
1029 | unsigned int i; |
1030 | ||
1031 | ACPI_FUNCTION_TRACE("acpi_processor_power_init"); | |
1032 | ||
1033 | if (!first_run) { | |
1034 | dmi_check_system(processor_power_dmi_table); | |
1035 | if (max_cstate < ACPI_C_STATES_MAX) | |
4be44fcd LB |
1036 | printk(KERN_NOTICE |
1037 | "ACPI: processor limited to max C-state %d\n", | |
1038 | max_cstate); | |
1da177e4 LT |
1039 | first_run++; |
1040 | } | |
1041 | ||
02df8b93 VP |
1042 | if (!pr) |
1043 | return_VALUE(-EINVAL); | |
1044 | ||
1045 | if (acpi_fadt.cst_cnt && !nocst) { | |
4be44fcd LB |
1046 | status = |
1047 | acpi_os_write_port(acpi_fadt.smi_cmd, acpi_fadt.cst_cnt, 8); | |
1da177e4 LT |
1048 | if (ACPI_FAILURE(status)) { |
1049 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
1050 | "Notifying BIOS of _CST ability failed\n")); | |
1051 | } | |
1052 | } | |
1053 | ||
02df8b93 VP |
1054 | acpi_processor_power_init_pdc(&(pr->power), pr->id); |
1055 | acpi_processor_set_pdc(pr, pr->power.pdc); | |
1da177e4 LT |
1056 | acpi_processor_get_power_info(pr); |
1057 | ||
1058 | /* | |
1059 | * Install the idle handler if processor power management is supported. | |
1060 | * Note that we use previously set idle handler will be used on | |
1061 | * platforms that only support C1. | |
1062 | */ | |
1063 | if ((pr->flags.power) && (!boot_option_idle_override)) { | |
1064 | printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); | |
1065 | for (i = 1; i <= pr->power.count; i++) | |
1066 | if (pr->power.states[i].valid) | |
4be44fcd LB |
1067 | printk(" C%d[C%d]", i, |
1068 | pr->power.states[i].type); | |
1da177e4 LT |
1069 | printk(")\n"); |
1070 | ||
1071 | if (pr->id == 0) { | |
1072 | pm_idle_save = pm_idle; | |
1073 | pm_idle = acpi_processor_idle; | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | /* 'power' [R] */ | |
1078 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, | |
4be44fcd | 1079 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 LT |
1080 | if (!entry) |
1081 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
1082 | "Unable to create '%s' fs entry\n", |
1083 | ACPI_PROCESSOR_FILE_POWER)); | |
1da177e4 LT |
1084 | else { |
1085 | entry->proc_fops = &acpi_processor_power_fops; | |
1086 | entry->data = acpi_driver_data(device); | |
1087 | entry->owner = THIS_MODULE; | |
1088 | } | |
1089 | ||
1090 | pr->flags.power_setup_done = 1; | |
1091 | ||
1092 | return_VALUE(0); | |
1093 | } | |
1094 | ||
4be44fcd LB |
1095 | int acpi_processor_power_exit(struct acpi_processor *pr, |
1096 | struct acpi_device *device) | |
1da177e4 LT |
1097 | { |
1098 | ACPI_FUNCTION_TRACE("acpi_processor_power_exit"); | |
1099 | ||
1100 | pr->flags.power_setup_done = 0; | |
1101 | ||
1102 | if (acpi_device_dir(device)) | |
4be44fcd LB |
1103 | remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
1104 | acpi_device_dir(device)); | |
1da177e4 LT |
1105 | |
1106 | /* Unregister the idle handler when processor #0 is removed. */ | |
1107 | if (pr->id == 0) { | |
1108 | pm_idle = pm_idle_save; | |
1109 | ||
1110 | /* | |
1111 | * We are about to unload the current idle thread pm callback | |
1112 | * (pm_idle), Wait for all processors to update cached/local | |
1113 | * copies of pm_idle before proceeding. | |
1114 | */ | |
1115 | cpu_idle_wait(); | |
1116 | } | |
1117 | ||
1118 | return_VALUE(0); | |
1119 | } |