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[] = { |
876c184b TR |
98 | { set_max_cstate, "IBM ThinkPad R40e", { |
99 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
100 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1}, | |
101 | { set_max_cstate, "IBM ThinkPad R40e", { | |
102 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
103 | DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1}, | |
104 | { set_max_cstate, "IBM ThinkPad R40e", { | |
105 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
106 | DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1}, | |
107 | { set_max_cstate, "IBM ThinkPad R40e", { | |
108 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
109 | DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1}, | |
110 | { set_max_cstate, "IBM ThinkPad R40e", { | |
111 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
112 | DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1}, | |
113 | { set_max_cstate, "IBM ThinkPad R40e", { | |
114 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
115 | DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1}, | |
116 | { set_max_cstate, "IBM ThinkPad R40e", { | |
117 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
118 | DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1}, | |
119 | { set_max_cstate, "IBM ThinkPad R40e", { | |
120 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
121 | DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1}, | |
122 | { set_max_cstate, "IBM ThinkPad R40e", { | |
123 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
124 | DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1}, | |
125 | { set_max_cstate, "IBM ThinkPad R40e", { | |
126 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
127 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1}, | |
128 | { set_max_cstate, "IBM ThinkPad R40e", { | |
129 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
130 | DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1}, | |
131 | { set_max_cstate, "IBM ThinkPad R40e", { | |
132 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
133 | DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1}, | |
134 | { set_max_cstate, "IBM ThinkPad R40e", { | |
135 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
136 | DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1}, | |
137 | { set_max_cstate, "IBM ThinkPad R40e", { | |
138 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
139 | DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1}, | |
140 | { set_max_cstate, "IBM ThinkPad R40e", { | |
141 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
142 | DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1}, | |
143 | { set_max_cstate, "Medion 41700", { | |
144 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), | |
145 | DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1}, | |
146 | { set_max_cstate, "Clevo 5600D", { | |
147 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), | |
148 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, | |
4be44fcd | 149 | (void *)2}, |
1da177e4 LT |
150 | {}, |
151 | }; | |
152 | ||
4be44fcd | 153 | static inline u32 ticks_elapsed(u32 t1, u32 t2) |
1da177e4 LT |
154 | { |
155 | if (t2 >= t1) | |
156 | return (t2 - t1); | |
157 | else if (!acpi_fadt.tmr_val_ext) | |
158 | return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); | |
159 | else | |
160 | return ((0xFFFFFFFF - t1) + t2); | |
161 | } | |
162 | ||
1da177e4 | 163 | static void |
4be44fcd LB |
164 | acpi_processor_power_activate(struct acpi_processor *pr, |
165 | struct acpi_processor_cx *new) | |
1da177e4 | 166 | { |
4be44fcd | 167 | struct acpi_processor_cx *old; |
1da177e4 LT |
168 | |
169 | if (!pr || !new) | |
170 | return; | |
171 | ||
172 | old = pr->power.state; | |
173 | ||
174 | if (old) | |
175 | old->promotion.count = 0; | |
4be44fcd | 176 | new->demotion.count = 0; |
1da177e4 LT |
177 | |
178 | /* Cleanup from old state. */ | |
179 | if (old) { | |
180 | switch (old->type) { | |
181 | case ACPI_STATE_C3: | |
182 | /* Disable bus master reload */ | |
02df8b93 | 183 | if (new->type != ACPI_STATE_C3 && pr->flags.bm_check) |
4be44fcd LB |
184 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0, |
185 | ACPI_MTX_DO_NOT_LOCK); | |
1da177e4 LT |
186 | break; |
187 | } | |
188 | } | |
189 | ||
190 | /* Prepare to use new state. */ | |
191 | switch (new->type) { | |
192 | case ACPI_STATE_C3: | |
193 | /* Enable bus master reload */ | |
02df8b93 | 194 | if (old->type != ACPI_STATE_C3 && pr->flags.bm_check) |
4be44fcd LB |
195 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1, |
196 | ACPI_MTX_DO_NOT_LOCK); | |
1da177e4 LT |
197 | break; |
198 | } | |
199 | ||
200 | pr->power.state = new; | |
201 | ||
202 | return; | |
203 | } | |
204 | ||
64c7c8f8 NP |
205 | static void acpi_safe_halt(void) |
206 | { | |
2a298a35 NP |
207 | clear_thread_flag(TIF_POLLING_NRFLAG); |
208 | smp_mb__after_clear_bit(); | |
64c7c8f8 NP |
209 | if (!need_resched()) |
210 | safe_halt(); | |
2a298a35 | 211 | set_thread_flag(TIF_POLLING_NRFLAG); |
64c7c8f8 NP |
212 | } |
213 | ||
4be44fcd | 214 | static atomic_t c3_cpu_count; |
1da177e4 | 215 | |
4be44fcd | 216 | static void acpi_processor_idle(void) |
1da177e4 | 217 | { |
4be44fcd | 218 | struct acpi_processor *pr = NULL; |
1da177e4 LT |
219 | struct acpi_processor_cx *cx = NULL; |
220 | struct acpi_processor_cx *next_state = NULL; | |
4be44fcd LB |
221 | int sleep_ticks = 0; |
222 | u32 t1, t2 = 0; | |
1da177e4 | 223 | |
64c7c8f8 | 224 | pr = processors[smp_processor_id()]; |
1da177e4 LT |
225 | if (!pr) |
226 | return; | |
227 | ||
228 | /* | |
229 | * Interrupts must be disabled during bus mastering calculations and | |
230 | * for C2/C3 transitions. | |
231 | */ | |
232 | local_irq_disable(); | |
233 | ||
234 | /* | |
235 | * Check whether we truly need to go idle, or should | |
236 | * reschedule: | |
237 | */ | |
238 | if (unlikely(need_resched())) { | |
239 | local_irq_enable(); | |
240 | return; | |
241 | } | |
242 | ||
243 | cx = pr->power.state; | |
64c7c8f8 NP |
244 | if (!cx) { |
245 | if (pm_idle_save) | |
246 | pm_idle_save(); | |
247 | else | |
248 | acpi_safe_halt(); | |
249 | return; | |
250 | } | |
1da177e4 LT |
251 | |
252 | /* | |
253 | * Check BM Activity | |
254 | * ----------------- | |
255 | * Check for bus mastering activity (if required), record, and check | |
256 | * for demotion. | |
257 | */ | |
258 | if (pr->flags.bm_check) { | |
4be44fcd LB |
259 | u32 bm_status = 0; |
260 | unsigned long diff = jiffies - pr->power.bm_check_timestamp; | |
1da177e4 LT |
261 | |
262 | if (diff > 32) | |
263 | diff = 32; | |
264 | ||
265 | while (diff) { | |
266 | /* if we didn't get called, assume there was busmaster activity */ | |
267 | diff--; | |
268 | if (diff) | |
269 | pr->power.bm_activity |= 0x1; | |
270 | pr->power.bm_activity <<= 1; | |
271 | } | |
272 | ||
273 | acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, | |
4be44fcd | 274 | &bm_status, ACPI_MTX_DO_NOT_LOCK); |
1da177e4 LT |
275 | if (bm_status) { |
276 | pr->power.bm_activity++; | |
277 | acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, | |
4be44fcd | 278 | 1, ACPI_MTX_DO_NOT_LOCK); |
1da177e4 LT |
279 | } |
280 | /* | |
281 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect | |
282 | * the true state of bus mastering activity; forcing us to | |
283 | * manually check the BMIDEA bit of each IDE channel. | |
284 | */ | |
285 | else if (errata.piix4.bmisx) { | |
286 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) | |
4be44fcd | 287 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
1da177e4 LT |
288 | pr->power.bm_activity++; |
289 | } | |
290 | ||
291 | pr->power.bm_check_timestamp = jiffies; | |
292 | ||
293 | /* | |
294 | * Apply bus mastering demotion policy. Automatically demote | |
295 | * to avoid a faulty transition. Note that the processor | |
296 | * won't enter a low-power state during this call (to this | |
297 | * funciton) but should upon the next. | |
298 | * | |
299 | * TBD: A better policy might be to fallback to the demotion | |
300 | * state (use it for this quantum only) istead of | |
301 | * demoting -- and rely on duration as our sole demotion | |
302 | * qualification. This may, however, introduce DMA | |
303 | * issues (e.g. floppy DMA transfer overrun/underrun). | |
304 | */ | |
305 | if (pr->power.bm_activity & cx->demotion.threshold.bm) { | |
306 | local_irq_enable(); | |
307 | next_state = cx->demotion.state; | |
308 | goto end; | |
309 | } | |
310 | } | |
311 | ||
4c033552 VP |
312 | #ifdef CONFIG_HOTPLUG_CPU |
313 | /* | |
314 | * Check for P_LVL2_UP flag before entering C2 and above on | |
315 | * an SMP system. We do it here instead of doing it at _CST/P_LVL | |
316 | * detection phase, to work cleanly with logical CPU hotplug. | |
317 | */ | |
318 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && | |
1e483969 DSL |
319 | !pr->flags.has_cst && !acpi_fadt.plvl2_up) |
320 | cx = &pr->power.states[ACPI_STATE_C1]; | |
4c033552 | 321 | #endif |
1e483969 DSL |
322 | |
323 | cx->usage++; | |
324 | ||
1da177e4 LT |
325 | /* |
326 | * Sleep: | |
327 | * ------ | |
328 | * Invoke the current Cx state to put the processor to sleep. | |
329 | */ | |
2a298a35 NP |
330 | if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) { |
331 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
332 | smp_mb__after_clear_bit(); | |
333 | if (need_resched()) { | |
334 | set_thread_flag(TIF_POLLING_NRFLAG); | |
af2eb17b | 335 | local_irq_enable(); |
2a298a35 NP |
336 | return; |
337 | } | |
338 | } | |
339 | ||
1da177e4 LT |
340 | switch (cx->type) { |
341 | ||
342 | case ACPI_STATE_C1: | |
343 | /* | |
344 | * Invoke C1. | |
345 | * Use the appropriate idle routine, the one that would | |
346 | * be used without acpi C-states. | |
347 | */ | |
348 | if (pm_idle_save) | |
349 | pm_idle_save(); | |
350 | else | |
64c7c8f8 NP |
351 | acpi_safe_halt(); |
352 | ||
1da177e4 | 353 | /* |
4be44fcd | 354 | * TBD: Can't get time duration while in C1, as resumes |
1da177e4 LT |
355 | * go to an ISR rather than here. Need to instrument |
356 | * base interrupt handler. | |
357 | */ | |
358 | sleep_ticks = 0xFFFFFFFF; | |
359 | break; | |
360 | ||
361 | case ACPI_STATE_C2: | |
362 | /* Get start time (ticks) */ | |
363 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); | |
364 | /* Invoke C2 */ | |
365 | inb(cx->address); | |
366 | /* Dummy op - must do something useless after P_LVL2 read */ | |
367 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
368 | /* Get end time (ticks) */ | |
369 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
370 | /* Re-enable interrupts */ | |
371 | local_irq_enable(); | |
2a298a35 | 372 | set_thread_flag(TIF_POLLING_NRFLAG); |
1da177e4 | 373 | /* Compute time (ticks) that we were actually asleep */ |
4be44fcd LB |
374 | sleep_ticks = |
375 | ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD; | |
1da177e4 LT |
376 | break; |
377 | ||
378 | case ACPI_STATE_C3: | |
4be44fcd | 379 | |
02df8b93 VP |
380 | if (pr->flags.bm_check) { |
381 | if (atomic_inc_return(&c3_cpu_count) == | |
4be44fcd | 382 | num_online_cpus()) { |
02df8b93 VP |
383 | /* |
384 | * All CPUs are trying to go to C3 | |
385 | * Disable bus master arbitration | |
386 | */ | |
387 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1, | |
4be44fcd | 388 | ACPI_MTX_DO_NOT_LOCK); |
02df8b93 VP |
389 | } |
390 | } else { | |
391 | /* SMP with no shared cache... Invalidate cache */ | |
392 | ACPI_FLUSH_CPU_CACHE(); | |
393 | } | |
4be44fcd | 394 | |
1da177e4 LT |
395 | /* Get start time (ticks) */ |
396 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); | |
397 | /* Invoke C3 */ | |
398 | inb(cx->address); | |
399 | /* Dummy op - must do something useless after P_LVL3 read */ | |
400 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
401 | /* Get end time (ticks) */ | |
402 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); | |
02df8b93 VP |
403 | if (pr->flags.bm_check) { |
404 | /* Enable bus master arbitration */ | |
405 | atomic_dec(&c3_cpu_count); | |
4be44fcd LB |
406 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, |
407 | ACPI_MTX_DO_NOT_LOCK); | |
02df8b93 VP |
408 | } |
409 | ||
1da177e4 LT |
410 | /* Re-enable interrupts */ |
411 | local_irq_enable(); | |
2a298a35 | 412 | set_thread_flag(TIF_POLLING_NRFLAG); |
1da177e4 | 413 | /* Compute time (ticks) that we were actually asleep */ |
4be44fcd LB |
414 | sleep_ticks = |
415 | ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD; | |
1da177e4 LT |
416 | break; |
417 | ||
418 | default: | |
419 | local_irq_enable(); | |
420 | return; | |
421 | } | |
422 | ||
423 | next_state = pr->power.state; | |
424 | ||
1e483969 DSL |
425 | #ifdef CONFIG_HOTPLUG_CPU |
426 | /* Don't do promotion/demotion */ | |
427 | if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) && | |
428 | !pr->flags.has_cst && !acpi_fadt.plvl2_up) { | |
429 | next_state = cx; | |
430 | goto end; | |
431 | } | |
432 | #endif | |
433 | ||
1da177e4 LT |
434 | /* |
435 | * Promotion? | |
436 | * ---------- | |
437 | * Track the number of longs (time asleep is greater than threshold) | |
438 | * and promote when the count threshold is reached. Note that bus | |
439 | * mastering activity may prevent promotions. | |
440 | * Do not promote above max_cstate. | |
441 | */ | |
442 | if (cx->promotion.state && | |
443 | ((cx->promotion.state - pr->power.states) <= max_cstate)) { | |
444 | if (sleep_ticks > cx->promotion.threshold.ticks) { | |
445 | cx->promotion.count++; | |
4be44fcd LB |
446 | cx->demotion.count = 0; |
447 | if (cx->promotion.count >= | |
448 | cx->promotion.threshold.count) { | |
1da177e4 | 449 | if (pr->flags.bm_check) { |
4be44fcd LB |
450 | if (! |
451 | (pr->power.bm_activity & cx-> | |
452 | promotion.threshold.bm)) { | |
453 | next_state = | |
454 | cx->promotion.state; | |
1da177e4 LT |
455 | goto end; |
456 | } | |
4be44fcd | 457 | } else { |
1da177e4 LT |
458 | next_state = cx->promotion.state; |
459 | goto end; | |
460 | } | |
461 | } | |
462 | } | |
463 | } | |
464 | ||
465 | /* | |
466 | * Demotion? | |
467 | * --------- | |
468 | * Track the number of shorts (time asleep is less than time threshold) | |
469 | * and demote when the usage threshold is reached. | |
470 | */ | |
471 | if (cx->demotion.state) { | |
472 | if (sleep_ticks < cx->demotion.threshold.ticks) { | |
473 | cx->demotion.count++; | |
474 | cx->promotion.count = 0; | |
475 | if (cx->demotion.count >= cx->demotion.threshold.count) { | |
476 | next_state = cx->demotion.state; | |
477 | goto end; | |
478 | } | |
479 | } | |
480 | } | |
481 | ||
4be44fcd | 482 | end: |
1da177e4 LT |
483 | /* |
484 | * Demote if current state exceeds max_cstate | |
485 | */ | |
486 | if ((pr->power.state - pr->power.states) > max_cstate) { | |
487 | if (cx->demotion.state) | |
488 | next_state = cx->demotion.state; | |
489 | } | |
490 | ||
491 | /* | |
492 | * New Cx State? | |
493 | * ------------- | |
494 | * If we're going to start using a new Cx state we must clean up | |
495 | * from the previous and prepare to use the new. | |
496 | */ | |
497 | if (next_state != pr->power.state) | |
498 | acpi_processor_power_activate(pr, next_state); | |
1da177e4 LT |
499 | } |
500 | ||
4be44fcd | 501 | static int acpi_processor_set_power_policy(struct acpi_processor *pr) |
1da177e4 LT |
502 | { |
503 | unsigned int i; | |
504 | unsigned int state_is_set = 0; | |
505 | struct acpi_processor_cx *lower = NULL; | |
506 | struct acpi_processor_cx *higher = NULL; | |
507 | struct acpi_processor_cx *cx; | |
508 | ||
4be44fcd | 509 | ACPI_FUNCTION_TRACE("acpi_processor_set_power_policy"); |
1da177e4 LT |
510 | |
511 | if (!pr) | |
512 | return_VALUE(-EINVAL); | |
513 | ||
514 | /* | |
515 | * This function sets the default Cx state policy (OS idle handler). | |
516 | * Our scheme is to promote quickly to C2 but more conservatively | |
517 | * to C3. We're favoring C2 for its characteristics of low latency | |
518 | * (quick response), good power savings, and ability to allow bus | |
519 | * mastering activity. Note that the Cx state policy is completely | |
520 | * customizable and can be altered dynamically. | |
521 | */ | |
522 | ||
523 | /* startup state */ | |
4be44fcd | 524 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
525 | cx = &pr->power.states[i]; |
526 | if (!cx->valid) | |
527 | continue; | |
528 | ||
529 | if (!state_is_set) | |
530 | pr->power.state = cx; | |
531 | state_is_set++; | |
532 | break; | |
4be44fcd | 533 | } |
1da177e4 LT |
534 | |
535 | if (!state_is_set) | |
536 | return_VALUE(-ENODEV); | |
537 | ||
538 | /* demotion */ | |
4be44fcd | 539 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
540 | cx = &pr->power.states[i]; |
541 | if (!cx->valid) | |
542 | continue; | |
543 | ||
544 | if (lower) { | |
545 | cx->demotion.state = lower; | |
546 | cx->demotion.threshold.ticks = cx->latency_ticks; | |
547 | cx->demotion.threshold.count = 1; | |
548 | if (cx->type == ACPI_STATE_C3) | |
549 | cx->demotion.threshold.bm = bm_history; | |
550 | } | |
551 | ||
552 | lower = cx; | |
553 | } | |
554 | ||
555 | /* promotion */ | |
556 | for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) { | |
557 | cx = &pr->power.states[i]; | |
558 | if (!cx->valid) | |
559 | continue; | |
560 | ||
561 | if (higher) { | |
4be44fcd | 562 | cx->promotion.state = higher; |
1da177e4 LT |
563 | cx->promotion.threshold.ticks = cx->latency_ticks; |
564 | if (cx->type >= ACPI_STATE_C2) | |
565 | cx->promotion.threshold.count = 4; | |
566 | else | |
567 | cx->promotion.threshold.count = 10; | |
568 | if (higher->type == ACPI_STATE_C3) | |
569 | cx->promotion.threshold.bm = bm_history; | |
570 | } | |
571 | ||
572 | higher = cx; | |
573 | } | |
574 | ||
4be44fcd | 575 | return_VALUE(0); |
1da177e4 LT |
576 | } |
577 | ||
4be44fcd | 578 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
1da177e4 | 579 | { |
1da177e4 LT |
580 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_fadt"); |
581 | ||
582 | if (!pr) | |
583 | return_VALUE(-EINVAL); | |
584 | ||
585 | if (!pr->pblk) | |
586 | return_VALUE(-ENODEV); | |
587 | ||
1da177e4 | 588 | /* if info is obtained from pblk/fadt, type equals state */ |
1da177e4 LT |
589 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
590 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; | |
591 | ||
4c033552 VP |
592 | #ifndef CONFIG_HOTPLUG_CPU |
593 | /* | |
594 | * Check for P_LVL2_UP flag before entering C2 and above on | |
595 | * an SMP system. | |
596 | */ | |
1e483969 | 597 | if ((num_online_cpus() > 1) && !acpi_fadt.plvl2_up) |
4c033552 VP |
598 | return_VALUE(-ENODEV); |
599 | #endif | |
600 | ||
1da177e4 LT |
601 | /* determine C2 and C3 address from pblk */ |
602 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; | |
603 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; | |
604 | ||
605 | /* determine latencies from FADT */ | |
606 | pr->power.states[ACPI_STATE_C2].latency = acpi_fadt.plvl2_lat; | |
607 | pr->power.states[ACPI_STATE_C3].latency = acpi_fadt.plvl3_lat; | |
608 | ||
609 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
610 | "lvl2[0x%08x] lvl3[0x%08x]\n", | |
611 | pr->power.states[ACPI_STATE_C2].address, | |
612 | pr->power.states[ACPI_STATE_C3].address)); | |
613 | ||
614 | return_VALUE(0); | |
615 | } | |
616 | ||
4be44fcd | 617 | static int acpi_processor_get_power_info_default_c1(struct acpi_processor *pr) |
acf05f4b | 618 | { |
acf05f4b VP |
619 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_default_c1"); |
620 | ||
cf824788 | 621 | /* Zero initialize all the C-states info. */ |
2203d6ed | 622 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
acf05f4b | 623 | |
cf824788 | 624 | /* set the first C-State to C1 */ |
acf05f4b | 625 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; |
acf05f4b VP |
626 | |
627 | /* the C0 state only exists as a filler in our array, | |
628 | * and all processors need to support C1 */ | |
629 | pr->power.states[ACPI_STATE_C0].valid = 1; | |
630 | pr->power.states[ACPI_STATE_C1].valid = 1; | |
631 | ||
632 | return_VALUE(0); | |
633 | } | |
634 | ||
4be44fcd | 635 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
1da177e4 | 636 | { |
4be44fcd LB |
637 | acpi_status status = 0; |
638 | acpi_integer count; | |
cf824788 | 639 | int current_count; |
4be44fcd LB |
640 | int i; |
641 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
642 | union acpi_object *cst; | |
1da177e4 LT |
643 | |
644 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_cst"); | |
645 | ||
1da177e4 LT |
646 | if (nocst) |
647 | return_VALUE(-ENODEV); | |
648 | ||
cf824788 JM |
649 | current_count = 1; |
650 | ||
651 | /* Zero initialize C2 onwards and prepare for fresh CST lookup */ | |
652 | for (i = 2; i < ACPI_PROCESSOR_MAX_POWER; i++) | |
653 | memset(&(pr->power.states[i]), 0, | |
654 | sizeof(struct acpi_processor_cx)); | |
1da177e4 LT |
655 | |
656 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); | |
657 | if (ACPI_FAILURE(status)) { | |
658 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); | |
659 | return_VALUE(-ENODEV); | |
4be44fcd | 660 | } |
1da177e4 | 661 | |
4be44fcd | 662 | cst = (union acpi_object *)buffer.pointer; |
1da177e4 LT |
663 | |
664 | /* There must be at least 2 elements */ | |
665 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { | |
4be44fcd LB |
666 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
667 | "not enough elements in _CST\n")); | |
1da177e4 LT |
668 | status = -EFAULT; |
669 | goto end; | |
670 | } | |
671 | ||
672 | count = cst->package.elements[0].integer.value; | |
673 | ||
674 | /* Validate number of power states. */ | |
675 | if (count < 1 || count != cst->package.count - 1) { | |
4be44fcd LB |
676 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
677 | "count given by _CST is not valid\n")); | |
1da177e4 LT |
678 | status = -EFAULT; |
679 | goto end; | |
680 | } | |
681 | ||
1da177e4 LT |
682 | /* Tell driver that at least _CST is supported. */ |
683 | pr->flags.has_cst = 1; | |
684 | ||
685 | for (i = 1; i <= count; i++) { | |
686 | union acpi_object *element; | |
687 | union acpi_object *obj; | |
688 | struct acpi_power_register *reg; | |
689 | struct acpi_processor_cx cx; | |
690 | ||
691 | memset(&cx, 0, sizeof(cx)); | |
692 | ||
4be44fcd | 693 | element = (union acpi_object *)&(cst->package.elements[i]); |
1da177e4 LT |
694 | if (element->type != ACPI_TYPE_PACKAGE) |
695 | continue; | |
696 | ||
697 | if (element->package.count != 4) | |
698 | continue; | |
699 | ||
4be44fcd | 700 | obj = (union acpi_object *)&(element->package.elements[0]); |
1da177e4 LT |
701 | |
702 | if (obj->type != ACPI_TYPE_BUFFER) | |
703 | continue; | |
704 | ||
4be44fcd | 705 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
1da177e4 LT |
706 | |
707 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && | |
4be44fcd | 708 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
1da177e4 LT |
709 | continue; |
710 | ||
711 | cx.address = (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) ? | |
4be44fcd | 712 | 0 : reg->address; |
1da177e4 LT |
713 | |
714 | /* There should be an easy way to extract an integer... */ | |
4be44fcd | 715 | obj = (union acpi_object *)&(element->package.elements[1]); |
1da177e4 LT |
716 | if (obj->type != ACPI_TYPE_INTEGER) |
717 | continue; | |
718 | ||
719 | cx.type = obj->integer.value; | |
720 | ||
721 | if ((cx.type != ACPI_STATE_C1) && | |
722 | (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO)) | |
723 | continue; | |
724 | ||
cf824788 | 725 | if ((cx.type < ACPI_STATE_C2) || (cx.type > ACPI_STATE_C3)) |
1da177e4 LT |
726 | continue; |
727 | ||
4be44fcd | 728 | obj = (union acpi_object *)&(element->package.elements[2]); |
1da177e4 LT |
729 | if (obj->type != ACPI_TYPE_INTEGER) |
730 | continue; | |
731 | ||
732 | cx.latency = obj->integer.value; | |
733 | ||
4be44fcd | 734 | obj = (union acpi_object *)&(element->package.elements[3]); |
1da177e4 LT |
735 | if (obj->type != ACPI_TYPE_INTEGER) |
736 | continue; | |
737 | ||
738 | cx.power = obj->integer.value; | |
739 | ||
cf824788 JM |
740 | current_count++; |
741 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); | |
742 | ||
743 | /* | |
744 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 | |
745 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) | |
746 | */ | |
747 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { | |
748 | printk(KERN_WARNING | |
749 | "Limiting number of power states to max (%d)\n", | |
750 | ACPI_PROCESSOR_MAX_POWER); | |
751 | printk(KERN_WARNING | |
752 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); | |
753 | break; | |
754 | } | |
1da177e4 LT |
755 | } |
756 | ||
4be44fcd | 757 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
cf824788 | 758 | current_count)); |
1da177e4 LT |
759 | |
760 | /* Validate number of power states discovered */ | |
cf824788 | 761 | if (current_count < 2) |
6d93c648 | 762 | status = -EFAULT; |
1da177e4 | 763 | |
4be44fcd | 764 | end: |
1da177e4 LT |
765 | acpi_os_free(buffer.pointer); |
766 | ||
767 | return_VALUE(status); | |
768 | } | |
769 | ||
1da177e4 LT |
770 | static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) |
771 | { | |
772 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c2"); | |
773 | ||
774 | if (!cx->address) | |
775 | return_VOID; | |
776 | ||
777 | /* | |
778 | * C2 latency must be less than or equal to 100 | |
779 | * microseconds. | |
780 | */ | |
781 | else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { | |
782 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 783 | "latency too large [%d]\n", cx->latency)); |
1da177e4 LT |
784 | return_VOID; |
785 | } | |
786 | ||
1da177e4 LT |
787 | /* |
788 | * Otherwise we've met all of our C2 requirements. | |
789 | * Normalize the C2 latency to expidite policy | |
790 | */ | |
791 | cx->valid = 1; | |
792 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); | |
793 | ||
794 | return_VOID; | |
795 | } | |
796 | ||
4be44fcd LB |
797 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
798 | struct acpi_processor_cx *cx) | |
1da177e4 | 799 | { |
02df8b93 VP |
800 | static int bm_check_flag; |
801 | ||
1da177e4 LT |
802 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c3"); |
803 | ||
804 | if (!cx->address) | |
805 | return_VOID; | |
806 | ||
807 | /* | |
808 | * C3 latency must be less than or equal to 1000 | |
809 | * microseconds. | |
810 | */ | |
811 | else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { | |
812 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 813 | "latency too large [%d]\n", cx->latency)); |
1da177e4 LT |
814 | return_VOID; |
815 | } | |
816 | ||
1da177e4 LT |
817 | /* |
818 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) | |
819 | * DMA transfers are used by any ISA device to avoid livelock. | |
820 | * Note that we could disable Type-F DMA (as recommended by | |
821 | * the erratum), but this is known to disrupt certain ISA | |
822 | * devices thus we take the conservative approach. | |
823 | */ | |
824 | else if (errata.piix4.fdma) { | |
825 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 826 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
1da177e4 LT |
827 | return_VOID; |
828 | } | |
829 | ||
02df8b93 VP |
830 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
831 | if (!bm_check_flag) { | |
832 | /* Determine whether bm_check is needed based on CPU */ | |
833 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); | |
834 | bm_check_flag = pr->flags.bm_check; | |
835 | } else { | |
836 | pr->flags.bm_check = bm_check_flag; | |
837 | } | |
838 | ||
839 | if (pr->flags.bm_check) { | |
02df8b93 VP |
840 | /* bus mastering control is necessary */ |
841 | if (!pr->flags.bm_control) { | |
842 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 843 | "C3 support requires bus mastering control\n")); |
02df8b93 VP |
844 | return_VOID; |
845 | } | |
846 | } else { | |
02df8b93 VP |
847 | /* |
848 | * WBINVD should be set in fadt, for C3 state to be | |
849 | * supported on when bm_check is not required. | |
850 | */ | |
851 | if (acpi_fadt.wb_invd != 1) { | |
852 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
853 | "Cache invalidation should work properly" |
854 | " for C3 to be enabled on SMP systems\n")); | |
02df8b93 VP |
855 | return_VOID; |
856 | } | |
857 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, | |
4be44fcd | 858 | 0, ACPI_MTX_DO_NOT_LOCK); |
02df8b93 VP |
859 | } |
860 | ||
1da177e4 LT |
861 | /* |
862 | * Otherwise we've met all of our C3 requirements. | |
863 | * Normalize the C3 latency to expidite policy. Enable | |
864 | * checking of bus mastering status (bm_check) so we can | |
865 | * use this in our C3 policy | |
866 | */ | |
867 | cx->valid = 1; | |
868 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); | |
1da177e4 LT |
869 | |
870 | return_VOID; | |
871 | } | |
872 | ||
1da177e4 LT |
873 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
874 | { | |
875 | unsigned int i; | |
876 | unsigned int working = 0; | |
877 | ||
6eb0a0fd VP |
878 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
879 | struct cpuinfo_x86 *c = cpu_data + pr->id; | |
880 | cpumask_t mask = cpumask_of_cpu(pr->id); | |
881 | ||
882 | if (c->x86_vendor == X86_VENDOR_INTEL) { | |
883 | on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1); | |
884 | } | |
885 | #endif | |
886 | ||
4be44fcd | 887 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
888 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
889 | ||
890 | switch (cx->type) { | |
891 | case ACPI_STATE_C1: | |
892 | cx->valid = 1; | |
893 | break; | |
894 | ||
895 | case ACPI_STATE_C2: | |
896 | acpi_processor_power_verify_c2(cx); | |
897 | break; | |
898 | ||
899 | case ACPI_STATE_C3: | |
900 | acpi_processor_power_verify_c3(pr, cx); | |
6eb0a0fd | 901 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
76b461c2 | 902 | if (cx->valid && c->x86_vendor == X86_VENDOR_INTEL) { |
6eb0a0fd VP |
903 | on_each_cpu(switch_APIC_timer_to_ipi, |
904 | &mask, 1, 1); | |
905 | } | |
906 | #endif | |
1da177e4 LT |
907 | break; |
908 | } | |
909 | ||
910 | if (cx->valid) | |
911 | working++; | |
912 | } | |
913 | ||
914 | return (working); | |
915 | } | |
916 | ||
4be44fcd | 917 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
1da177e4 LT |
918 | { |
919 | unsigned int i; | |
920 | int result; | |
921 | ||
922 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info"); | |
923 | ||
924 | /* NOTE: the idle thread may not be running while calling | |
925 | * this function */ | |
926 | ||
cf824788 JM |
927 | /* Adding C1 state */ |
928 | acpi_processor_get_power_info_default_c1(pr); | |
1da177e4 | 929 | result = acpi_processor_get_power_info_cst(pr); |
6d93c648 | 930 | if (result == -ENODEV) |
cf824788 | 931 | acpi_processor_get_power_info_fadt(pr); |
6d93c648 | 932 | |
cf824788 | 933 | pr->power.count = acpi_processor_power_verify(pr); |
1da177e4 LT |
934 | |
935 | /* | |
936 | * Set Default Policy | |
937 | * ------------------ | |
938 | * Now that we know which states are supported, set the default | |
939 | * policy. Note that this policy can be changed dynamically | |
940 | * (e.g. encourage deeper sleeps to conserve battery life when | |
941 | * not on AC). | |
942 | */ | |
943 | result = acpi_processor_set_power_policy(pr); | |
944 | if (result) | |
945 | return_VALUE(result); | |
946 | ||
947 | /* | |
948 | * if one state of type C2 or C3 is available, mark this | |
949 | * CPU as being "idle manageable" | |
950 | */ | |
951 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { | |
acf05f4b | 952 | if (pr->power.states[i].valid) { |
1da177e4 | 953 | pr->power.count = i; |
2203d6ed LT |
954 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
955 | pr->flags.power = 1; | |
acf05f4b | 956 | } |
1da177e4 LT |
957 | } |
958 | ||
959 | return_VALUE(0); | |
960 | } | |
961 | ||
4be44fcd | 962 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
1da177e4 | 963 | { |
4be44fcd | 964 | int result = 0; |
1da177e4 LT |
965 | |
966 | ACPI_FUNCTION_TRACE("acpi_processor_cst_has_changed"); | |
967 | ||
968 | if (!pr) | |
4be44fcd | 969 | return_VALUE(-EINVAL); |
1da177e4 | 970 | |
4be44fcd | 971 | if (nocst) { |
1da177e4 LT |
972 | return_VALUE(-ENODEV); |
973 | } | |
974 | ||
975 | if (!pr->flags.power_setup_done) | |
976 | return_VALUE(-ENODEV); | |
977 | ||
978 | /* Fall back to the default idle loop */ | |
979 | pm_idle = pm_idle_save; | |
4be44fcd | 980 | synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ |
1da177e4 LT |
981 | |
982 | pr->flags.power = 0; | |
983 | result = acpi_processor_get_power_info(pr); | |
984 | if ((pr->flags.power == 1) && (pr->flags.power_setup_done)) | |
985 | pm_idle = acpi_processor_idle; | |
986 | ||
987 | return_VALUE(result); | |
988 | } | |
989 | ||
990 | /* proc interface */ | |
991 | ||
992 | static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) | |
993 | { | |
4be44fcd LB |
994 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
995 | unsigned int i; | |
1da177e4 LT |
996 | |
997 | ACPI_FUNCTION_TRACE("acpi_processor_power_seq_show"); | |
998 | ||
999 | if (!pr) | |
1000 | goto end; | |
1001 | ||
1002 | seq_printf(seq, "active state: C%zd\n" | |
4be44fcd LB |
1003 | "max_cstate: C%d\n" |
1004 | "bus master activity: %08x\n", | |
1005 | pr->power.state ? pr->power.state - pr->power.states : 0, | |
1006 | max_cstate, (unsigned)pr->power.bm_activity); | |
1da177e4 LT |
1007 | |
1008 | seq_puts(seq, "states:\n"); | |
1009 | ||
1010 | for (i = 1; i <= pr->power.count; i++) { | |
1011 | seq_printf(seq, " %cC%d: ", | |
4be44fcd LB |
1012 | (&pr->power.states[i] == |
1013 | pr->power.state ? '*' : ' '), i); | |
1da177e4 LT |
1014 | |
1015 | if (!pr->power.states[i].valid) { | |
1016 | seq_puts(seq, "<not supported>\n"); | |
1017 | continue; | |
1018 | } | |
1019 | ||
1020 | switch (pr->power.states[i].type) { | |
1021 | case ACPI_STATE_C1: | |
1022 | seq_printf(seq, "type[C1] "); | |
1023 | break; | |
1024 | case ACPI_STATE_C2: | |
1025 | seq_printf(seq, "type[C2] "); | |
1026 | break; | |
1027 | case ACPI_STATE_C3: | |
1028 | seq_printf(seq, "type[C3] "); | |
1029 | break; | |
1030 | default: | |
1031 | seq_printf(seq, "type[--] "); | |
1032 | break; | |
1033 | } | |
1034 | ||
1035 | if (pr->power.states[i].promotion.state) | |
1036 | seq_printf(seq, "promotion[C%zd] ", | |
4be44fcd LB |
1037 | (pr->power.states[i].promotion.state - |
1038 | pr->power.states)); | |
1da177e4 LT |
1039 | else |
1040 | seq_puts(seq, "promotion[--] "); | |
1041 | ||
1042 | if (pr->power.states[i].demotion.state) | |
1043 | seq_printf(seq, "demotion[C%zd] ", | |
4be44fcd LB |
1044 | (pr->power.states[i].demotion.state - |
1045 | pr->power.states)); | |
1da177e4 LT |
1046 | else |
1047 | seq_puts(seq, "demotion[--] "); | |
1048 | ||
1049 | seq_printf(seq, "latency[%03d] usage[%08d]\n", | |
4be44fcd LB |
1050 | pr->power.states[i].latency, |
1051 | pr->power.states[i].usage); | |
1da177e4 LT |
1052 | } |
1053 | ||
4be44fcd | 1054 | end: |
1da177e4 LT |
1055 | return_VALUE(0); |
1056 | } | |
1057 | ||
1058 | static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) | |
1059 | { | |
1060 | return single_open(file, acpi_processor_power_seq_show, | |
4be44fcd | 1061 | PDE(inode)->data); |
1da177e4 LT |
1062 | } |
1063 | ||
1064 | static struct file_operations acpi_processor_power_fops = { | |
4be44fcd LB |
1065 | .open = acpi_processor_power_open_fs, |
1066 | .read = seq_read, | |
1067 | .llseek = seq_lseek, | |
1068 | .release = single_release, | |
1da177e4 LT |
1069 | }; |
1070 | ||
4be44fcd LB |
1071 | int acpi_processor_power_init(struct acpi_processor *pr, |
1072 | struct acpi_device *device) | |
1da177e4 | 1073 | { |
4be44fcd LB |
1074 | acpi_status status = 0; |
1075 | static int first_run = 0; | |
1076 | struct proc_dir_entry *entry = NULL; | |
1da177e4 LT |
1077 | unsigned int i; |
1078 | ||
1079 | ACPI_FUNCTION_TRACE("acpi_processor_power_init"); | |
1080 | ||
1081 | if (!first_run) { | |
1082 | dmi_check_system(processor_power_dmi_table); | |
1083 | if (max_cstate < ACPI_C_STATES_MAX) | |
4be44fcd LB |
1084 | printk(KERN_NOTICE |
1085 | "ACPI: processor limited to max C-state %d\n", | |
1086 | max_cstate); | |
1da177e4 LT |
1087 | first_run++; |
1088 | } | |
1089 | ||
02df8b93 VP |
1090 | if (!pr) |
1091 | return_VALUE(-EINVAL); | |
1092 | ||
1093 | if (acpi_fadt.cst_cnt && !nocst) { | |
4be44fcd LB |
1094 | status = |
1095 | acpi_os_write_port(acpi_fadt.smi_cmd, acpi_fadt.cst_cnt, 8); | |
1da177e4 LT |
1096 | if (ACPI_FAILURE(status)) { |
1097 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
1098 | "Notifying BIOS of _CST ability failed\n")); | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | acpi_processor_get_power_info(pr); | |
1103 | ||
1104 | /* | |
1105 | * Install the idle handler if processor power management is supported. | |
1106 | * Note that we use previously set idle handler will be used on | |
1107 | * platforms that only support C1. | |
1108 | */ | |
1109 | if ((pr->flags.power) && (!boot_option_idle_override)) { | |
1110 | printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); | |
1111 | for (i = 1; i <= pr->power.count; i++) | |
1112 | if (pr->power.states[i].valid) | |
4be44fcd LB |
1113 | printk(" C%d[C%d]", i, |
1114 | pr->power.states[i].type); | |
1da177e4 LT |
1115 | printk(")\n"); |
1116 | ||
1117 | if (pr->id == 0) { | |
1118 | pm_idle_save = pm_idle; | |
1119 | pm_idle = acpi_processor_idle; | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | /* 'power' [R] */ | |
1124 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, | |
4be44fcd | 1125 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 LT |
1126 | if (!entry) |
1127 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
1128 | "Unable to create '%s' fs entry\n", |
1129 | ACPI_PROCESSOR_FILE_POWER)); | |
1da177e4 LT |
1130 | else { |
1131 | entry->proc_fops = &acpi_processor_power_fops; | |
1132 | entry->data = acpi_driver_data(device); | |
1133 | entry->owner = THIS_MODULE; | |
1134 | } | |
1135 | ||
1136 | pr->flags.power_setup_done = 1; | |
1137 | ||
1138 | return_VALUE(0); | |
1139 | } | |
1140 | ||
4be44fcd LB |
1141 | int acpi_processor_power_exit(struct acpi_processor *pr, |
1142 | struct acpi_device *device) | |
1da177e4 LT |
1143 | { |
1144 | ACPI_FUNCTION_TRACE("acpi_processor_power_exit"); | |
1145 | ||
1146 | pr->flags.power_setup_done = 0; | |
1147 | ||
1148 | if (acpi_device_dir(device)) | |
4be44fcd LB |
1149 | remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
1150 | acpi_device_dir(device)); | |
1da177e4 LT |
1151 | |
1152 | /* Unregister the idle handler when processor #0 is removed. */ | |
1153 | if (pr->id == 0) { | |
1154 | pm_idle = pm_idle_save; | |
1155 | ||
1156 | /* | |
1157 | * We are about to unload the current idle thread pm callback | |
1158 | * (pm_idle), Wait for all processors to update cached/local | |
1159 | * copies of pm_idle before proceeding. | |
1160 | */ | |
1161 | cpu_idle_wait(); | |
1162 | } | |
1163 | ||
1164 | return_VALUE(0); | |
1165 | } |