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> | |
c5ab81ca | 6 | * Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de> |
1da177e4 LT |
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() */ |
f011e2e2 | 41 | #include <linux/pm_qos_params.h> |
e9e2cdb4 | 42 | #include <linux/clockchips.h> |
4f86d3a8 | 43 | #include <linux/cpuidle.h> |
1da177e4 | 44 | |
3434933b TG |
45 | /* |
46 | * Include the apic definitions for x86 to have the APIC timer related defines | |
47 | * available also for UP (on SMP it gets magically included via linux/smp.h). | |
48 | * asm/acpi.h is not an option, as it would require more include magic. Also | |
49 | * creating an empty asm-ia64/apic.h would just trade pest vs. cholera. | |
50 | */ | |
51 | #ifdef CONFIG_X86 | |
52 | #include <asm/apic.h> | |
53 | #endif | |
54 | ||
1da177e4 LT |
55 | #include <asm/io.h> |
56 | #include <asm/uaccess.h> | |
57 | ||
58 | #include <acpi/acpi_bus.h> | |
59 | #include <acpi/processor.h> | |
60 | ||
61 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 | |
62 | #define ACPI_PROCESSOR_CLASS "processor" | |
1da177e4 | 63 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
f52fd66d | 64 | ACPI_MODULE_NAME("processor_idle"); |
1da177e4 | 65 | #define ACPI_PROCESSOR_FILE_POWER "power" |
1da177e4 | 66 | #define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000) |
2aa44d05 | 67 | #define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY) |
4f86d3a8 | 68 | #ifndef CONFIG_CPU_IDLE |
1da177e4 LT |
69 | #define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */ |
70 | #define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */ | |
b6835052 | 71 | static void (*pm_idle_save) (void) __read_mostly; |
4f86d3a8 LB |
72 | #else |
73 | #define C2_OVERHEAD 1 /* 1us */ | |
74 | #define C3_OVERHEAD 1 /* 1us */ | |
75 | #endif | |
76 | #define PM_TIMER_TICKS_TO_US(p) (((p) * 1000)/(PM_TIMER_FREQUENCY/1000)) | |
1da177e4 | 77 | |
4f86d3a8 | 78 | static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; |
5b3f0e6c | 79 | #ifdef CONFIG_CPU_IDLE |
4f86d3a8 | 80 | module_param(max_cstate, uint, 0000); |
5b3f0e6c VP |
81 | #else |
82 | module_param(max_cstate, uint, 0644); | |
83 | #endif | |
b6835052 | 84 | static unsigned int nocst __read_mostly; |
1da177e4 LT |
85 | module_param(nocst, uint, 0000); |
86 | ||
4f86d3a8 | 87 | #ifndef CONFIG_CPU_IDLE |
1da177e4 LT |
88 | /* |
89 | * bm_history -- bit-mask with a bit per jiffy of bus-master activity | |
90 | * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms | |
91 | * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms | |
92 | * 100 HZ: 0x0000000F: 4 jiffies = 40ms | |
93 | * reduce history for more aggressive entry into C3 | |
94 | */ | |
b6835052 | 95 | static unsigned int bm_history __read_mostly = |
4be44fcd | 96 | (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1)); |
1da177e4 | 97 | module_param(bm_history, uint, 0644); |
4f86d3a8 LB |
98 | |
99 | static int acpi_processor_set_power_policy(struct acpi_processor *pr); | |
100 | ||
4963f620 | 101 | #else /* CONFIG_CPU_IDLE */ |
25de5718 | 102 | static unsigned int latency_factor __read_mostly = 2; |
4963f620 | 103 | module_param(latency_factor, uint, 0644); |
4f86d3a8 | 104 | #endif |
1da177e4 LT |
105 | |
106 | /* | |
107 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. | |
108 | * For now disable this. Probably a bug somewhere else. | |
109 | * | |
110 | * To skip this limit, boot/load with a large max_cstate limit. | |
111 | */ | |
1855256c | 112 | static int set_max_cstate(const struct dmi_system_id *id) |
1da177e4 LT |
113 | { |
114 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) | |
115 | return 0; | |
116 | ||
3d35600a | 117 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
4be44fcd LB |
118 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
119 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); | |
1da177e4 | 120 | |
3d35600a | 121 | max_cstate = (long)id->driver_data; |
1da177e4 LT |
122 | |
123 | return 0; | |
124 | } | |
125 | ||
7ded5689 AR |
126 | /* Actually this shouldn't be __cpuinitdata, would be better to fix the |
127 | callers to only run once -AK */ | |
128 | static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { | |
f831335d BS |
129 | { set_max_cstate, "IBM ThinkPad R40e", { |
130 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
131 | DMI_MATCH(DMI_BIOS_VERSION,"1SET70WW")}, (void *)1}, | |
876c184b TR |
132 | { set_max_cstate, "IBM ThinkPad R40e", { |
133 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
134 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1}, | |
135 | { set_max_cstate, "IBM ThinkPad R40e", { | |
136 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
137 | DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1}, | |
138 | { set_max_cstate, "IBM ThinkPad R40e", { | |
139 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
140 | DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1}, | |
141 | { set_max_cstate, "IBM ThinkPad R40e", { | |
142 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
143 | DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1}, | |
144 | { set_max_cstate, "IBM ThinkPad R40e", { | |
145 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
146 | DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1}, | |
147 | { set_max_cstate, "IBM ThinkPad R40e", { | |
148 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
149 | DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1}, | |
150 | { set_max_cstate, "IBM ThinkPad R40e", { | |
151 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
152 | DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1}, | |
153 | { set_max_cstate, "IBM ThinkPad R40e", { | |
154 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
155 | DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1}, | |
156 | { set_max_cstate, "IBM ThinkPad R40e", { | |
157 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
158 | DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1}, | |
159 | { set_max_cstate, "IBM ThinkPad R40e", { | |
160 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
161 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1}, | |
162 | { set_max_cstate, "IBM ThinkPad R40e", { | |
163 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
164 | DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1}, | |
165 | { set_max_cstate, "IBM ThinkPad R40e", { | |
166 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
167 | DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1}, | |
168 | { set_max_cstate, "IBM ThinkPad R40e", { | |
169 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
170 | DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1}, | |
171 | { set_max_cstate, "IBM ThinkPad R40e", { | |
172 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
173 | DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1}, | |
174 | { set_max_cstate, "IBM ThinkPad R40e", { | |
175 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), | |
176 | DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1}, | |
177 | { set_max_cstate, "Medion 41700", { | |
178 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), | |
179 | DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1}, | |
180 | { set_max_cstate, "Clevo 5600D", { | |
181 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), | |
182 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, | |
4be44fcd | 183 | (void *)2}, |
1da177e4 LT |
184 | {}, |
185 | }; | |
186 | ||
4be44fcd | 187 | static inline u32 ticks_elapsed(u32 t1, u32 t2) |
1da177e4 LT |
188 | { |
189 | if (t2 >= t1) | |
190 | return (t2 - t1); | |
cee324b1 | 191 | else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER)) |
1da177e4 LT |
192 | return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); |
193 | else | |
194 | return ((0xFFFFFFFF - t1) + t2); | |
195 | } | |
196 | ||
4f86d3a8 LB |
197 | static inline u32 ticks_elapsed_in_us(u32 t1, u32 t2) |
198 | { | |
199 | if (t2 >= t1) | |
200 | return PM_TIMER_TICKS_TO_US(t2 - t1); | |
201 | else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER)) | |
202 | return PM_TIMER_TICKS_TO_US(((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); | |
203 | else | |
204 | return PM_TIMER_TICKS_TO_US((0xFFFFFFFF - t1) + t2); | |
205 | } | |
206 | ||
2e906655 | 207 | /* |
208 | * Callers should disable interrupts before the call and enable | |
209 | * interrupts after return. | |
210 | */ | |
ddc081a1 VP |
211 | static void acpi_safe_halt(void) |
212 | { | |
213 | current_thread_info()->status &= ~TS_POLLING; | |
214 | /* | |
215 | * TS_POLLING-cleared state must be visible before we | |
216 | * test NEED_RESCHED: | |
217 | */ | |
218 | smp_mb(); | |
71e93d15 | 219 | if (!need_resched()) { |
ddc081a1 | 220 | safe_halt(); |
71e93d15 VP |
221 | local_irq_disable(); |
222 | } | |
ddc081a1 VP |
223 | current_thread_info()->status |= TS_POLLING; |
224 | } | |
225 | ||
4f86d3a8 LB |
226 | #ifndef CONFIG_CPU_IDLE |
227 | ||
1da177e4 | 228 | static void |
4be44fcd LB |
229 | acpi_processor_power_activate(struct acpi_processor *pr, |
230 | struct acpi_processor_cx *new) | |
1da177e4 | 231 | { |
4be44fcd | 232 | struct acpi_processor_cx *old; |
1da177e4 LT |
233 | |
234 | if (!pr || !new) | |
235 | return; | |
236 | ||
237 | old = pr->power.state; | |
238 | ||
239 | if (old) | |
240 | old->promotion.count = 0; | |
4be44fcd | 241 | new->demotion.count = 0; |
1da177e4 LT |
242 | |
243 | /* Cleanup from old state. */ | |
244 | if (old) { | |
245 | switch (old->type) { | |
246 | case ACPI_STATE_C3: | |
247 | /* Disable bus master reload */ | |
02df8b93 | 248 | if (new->type != ACPI_STATE_C3 && pr->flags.bm_check) |
d8c71b6d | 249 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); |
1da177e4 LT |
250 | break; |
251 | } | |
252 | } | |
253 | ||
254 | /* Prepare to use new state. */ | |
255 | switch (new->type) { | |
256 | case ACPI_STATE_C3: | |
257 | /* Enable bus master reload */ | |
02df8b93 | 258 | if (old->type != ACPI_STATE_C3 && pr->flags.bm_check) |
d8c71b6d | 259 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1); |
1da177e4 LT |
260 | break; |
261 | } | |
262 | ||
263 | pr->power.state = new; | |
264 | ||
265 | return; | |
266 | } | |
267 | ||
4be44fcd | 268 | static atomic_t c3_cpu_count; |
1da177e4 | 269 | |
991528d7 VP |
270 | /* Common C-state entry for C2, C3, .. */ |
271 | static void acpi_cstate_enter(struct acpi_processor_cx *cstate) | |
272 | { | |
bc71bec9 | 273 | if (cstate->entry_method == ACPI_CSTATE_FFH) { |
991528d7 VP |
274 | /* Call into architectural FFH based C-state */ |
275 | acpi_processor_ffh_cstate_enter(cstate); | |
276 | } else { | |
277 | int unused; | |
278 | /* IO port based C-state */ | |
279 | inb(cstate->address); | |
280 | /* Dummy wait op - must do something useless after P_LVL2 read | |
281 | because chipsets cannot guarantee that STPCLK# signal | |
282 | gets asserted in time to freeze execution properly. */ | |
cee324b1 | 283 | unused = inl(acpi_gbl_FADT.xpm_timer_block.address); |
991528d7 VP |
284 | } |
285 | } | |
4f86d3a8 | 286 | #endif /* !CONFIG_CPU_IDLE */ |
991528d7 | 287 | |
169a0abb TG |
288 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
289 | ||
290 | /* | |
291 | * Some BIOS implementations switch to C3 in the published C2 state. | |
296d93cd LT |
292 | * This seems to be a common problem on AMD boxen, but other vendors |
293 | * are affected too. We pick the most conservative approach: we assume | |
294 | * that the local APIC stops in both C2 and C3. | |
169a0abb TG |
295 | */ |
296 | static void acpi_timer_check_state(int state, struct acpi_processor *pr, | |
297 | struct acpi_processor_cx *cx) | |
298 | { | |
299 | struct acpi_processor_power *pwr = &pr->power; | |
e585bef8 | 300 | u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2; |
169a0abb TG |
301 | |
302 | /* | |
303 | * Check, if one of the previous states already marked the lapic | |
304 | * unstable | |
305 | */ | |
306 | if (pwr->timer_broadcast_on_state < state) | |
307 | return; | |
308 | ||
e585bef8 | 309 | if (cx->type >= type) |
296d93cd | 310 | pr->power.timer_broadcast_on_state = state; |
169a0abb TG |
311 | } |
312 | ||
313 | static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) | |
314 | { | |
e9e2cdb4 TG |
315 | unsigned long reason; |
316 | ||
317 | reason = pr->power.timer_broadcast_on_state < INT_MAX ? | |
318 | CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; | |
319 | ||
320 | clockevents_notify(reason, &pr->id); | |
e9e2cdb4 TG |
321 | } |
322 | ||
323 | /* Power(C) State timer broadcast control */ | |
324 | static void acpi_state_timer_broadcast(struct acpi_processor *pr, | |
325 | struct acpi_processor_cx *cx, | |
326 | int broadcast) | |
327 | { | |
e9e2cdb4 TG |
328 | int state = cx - pr->power.states; |
329 | ||
330 | if (state >= pr->power.timer_broadcast_on_state) { | |
331 | unsigned long reason; | |
332 | ||
333 | reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : | |
334 | CLOCK_EVT_NOTIFY_BROADCAST_EXIT; | |
335 | clockevents_notify(reason, &pr->id); | |
336 | } | |
169a0abb TG |
337 | } |
338 | ||
339 | #else | |
340 | ||
341 | static void acpi_timer_check_state(int state, struct acpi_processor *pr, | |
342 | struct acpi_processor_cx *cstate) { } | |
343 | static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) { } | |
e9e2cdb4 TG |
344 | static void acpi_state_timer_broadcast(struct acpi_processor *pr, |
345 | struct acpi_processor_cx *cx, | |
346 | int broadcast) | |
347 | { | |
348 | } | |
169a0abb TG |
349 | |
350 | #endif | |
351 | ||
b04e7bdb TG |
352 | /* |
353 | * Suspend / resume control | |
354 | */ | |
355 | static int acpi_idle_suspend; | |
356 | ||
357 | int acpi_processor_suspend(struct acpi_device * device, pm_message_t state) | |
358 | { | |
359 | acpi_idle_suspend = 1; | |
360 | return 0; | |
361 | } | |
362 | ||
363 | int acpi_processor_resume(struct acpi_device * device) | |
364 | { | |
365 | acpi_idle_suspend = 0; | |
366 | return 0; | |
367 | } | |
368 | ||
61331168 | 369 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86) |
ddb25f9a AK |
370 | static int tsc_halts_in_c(int state) |
371 | { | |
372 | switch (boot_cpu_data.x86_vendor) { | |
373 | case X86_VENDOR_AMD: | |
374 | /* | |
375 | * AMD Fam10h TSC will tick in all | |
376 | * C/P/S0/S1 states when this bit is set. | |
377 | */ | |
378 | if (boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) | |
379 | return 0; | |
380 | /*FALL THROUGH*/ | |
381 | case X86_VENDOR_INTEL: | |
382 | /* Several cases known where TSC halts in C2 too */ | |
383 | default: | |
384 | return state > ACPI_STATE_C1; | |
385 | } | |
386 | } | |
387 | #endif | |
388 | ||
4f86d3a8 | 389 | #ifndef CONFIG_CPU_IDLE |
4be44fcd | 390 | static void acpi_processor_idle(void) |
1da177e4 | 391 | { |
4be44fcd | 392 | struct acpi_processor *pr = NULL; |
1da177e4 LT |
393 | struct acpi_processor_cx *cx = NULL; |
394 | struct acpi_processor_cx *next_state = NULL; | |
4be44fcd LB |
395 | int sleep_ticks = 0; |
396 | u32 t1, t2 = 0; | |
1da177e4 | 397 | |
1da177e4 LT |
398 | /* |
399 | * Interrupts must be disabled during bus mastering calculations and | |
400 | * for C2/C3 transitions. | |
401 | */ | |
402 | local_irq_disable(); | |
403 | ||
d5a3d32a VP |
404 | pr = processors[smp_processor_id()]; |
405 | if (!pr) { | |
406 | local_irq_enable(); | |
407 | return; | |
408 | } | |
409 | ||
1da177e4 LT |
410 | /* |
411 | * Check whether we truly need to go idle, or should | |
412 | * reschedule: | |
413 | */ | |
414 | if (unlikely(need_resched())) { | |
415 | local_irq_enable(); | |
416 | return; | |
417 | } | |
418 | ||
419 | cx = pr->power.state; | |
b04e7bdb | 420 | if (!cx || acpi_idle_suspend) { |
64c7c8f8 NP |
421 | if (pm_idle_save) |
422 | pm_idle_save(); | |
423 | else | |
424 | acpi_safe_halt(); | |
2e906655 | 425 | |
71e93d15 VP |
426 | if (irqs_disabled()) |
427 | local_irq_enable(); | |
428 | ||
64c7c8f8 NP |
429 | return; |
430 | } | |
1da177e4 LT |
431 | |
432 | /* | |
433 | * Check BM Activity | |
434 | * ----------------- | |
435 | * Check for bus mastering activity (if required), record, and check | |
436 | * for demotion. | |
437 | */ | |
438 | if (pr->flags.bm_check) { | |
4be44fcd LB |
439 | u32 bm_status = 0; |
440 | unsigned long diff = jiffies - pr->power.bm_check_timestamp; | |
1da177e4 | 441 | |
c5ab81ca DB |
442 | if (diff > 31) |
443 | diff = 31; | |
1da177e4 | 444 | |
c5ab81ca | 445 | pr->power.bm_activity <<= diff; |
1da177e4 | 446 | |
d8c71b6d | 447 | acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); |
1da177e4 | 448 | if (bm_status) { |
c5ab81ca | 449 | pr->power.bm_activity |= 0x1; |
d8c71b6d | 450 | acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); |
1da177e4 LT |
451 | } |
452 | /* | |
453 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect | |
454 | * the true state of bus mastering activity; forcing us to | |
455 | * manually check the BMIDEA bit of each IDE channel. | |
456 | */ | |
457 | else if (errata.piix4.bmisx) { | |
458 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) | |
4be44fcd | 459 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
c5ab81ca | 460 | pr->power.bm_activity |= 0x1; |
1da177e4 LT |
461 | } |
462 | ||
463 | pr->power.bm_check_timestamp = jiffies; | |
464 | ||
465 | /* | |
c4a001b1 | 466 | * If bus mastering is or was active this jiffy, demote |
1da177e4 LT |
467 | * to avoid a faulty transition. Note that the processor |
468 | * won't enter a low-power state during this call (to this | |
c4a001b1 | 469 | * function) but should upon the next. |
1da177e4 LT |
470 | * |
471 | * TBD: A better policy might be to fallback to the demotion | |
472 | * state (use it for this quantum only) istead of | |
473 | * demoting -- and rely on duration as our sole demotion | |
474 | * qualification. This may, however, introduce DMA | |
475 | * issues (e.g. floppy DMA transfer overrun/underrun). | |
476 | */ | |
c4a001b1 DB |
477 | if ((pr->power.bm_activity & 0x1) && |
478 | cx->demotion.threshold.bm) { | |
1da177e4 LT |
479 | local_irq_enable(); |
480 | next_state = cx->demotion.state; | |
481 | goto end; | |
482 | } | |
483 | } | |
484 | ||
4c033552 VP |
485 | #ifdef CONFIG_HOTPLUG_CPU |
486 | /* | |
487 | * Check for P_LVL2_UP flag before entering C2 and above on | |
488 | * an SMP system. We do it here instead of doing it at _CST/P_LVL | |
489 | * detection phase, to work cleanly with logical CPU hotplug. | |
490 | */ | |
4f86d3a8 | 491 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
cee324b1 | 492 | !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
1e483969 | 493 | cx = &pr->power.states[ACPI_STATE_C1]; |
4c033552 | 494 | #endif |
1e483969 | 495 | |
1da177e4 LT |
496 | /* |
497 | * Sleep: | |
498 | * ------ | |
499 | * Invoke the current Cx state to put the processor to sleep. | |
500 | */ | |
2a298a35 | 501 | if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) { |
495ab9c0 | 502 | current_thread_info()->status &= ~TS_POLLING; |
0888f06a IM |
503 | /* |
504 | * TS_POLLING-cleared state must be visible before we | |
505 | * test NEED_RESCHED: | |
506 | */ | |
507 | smp_mb(); | |
2a298a35 | 508 | if (need_resched()) { |
495ab9c0 | 509 | current_thread_info()->status |= TS_POLLING; |
af2eb17b | 510 | local_irq_enable(); |
2a298a35 NP |
511 | return; |
512 | } | |
513 | } | |
514 | ||
1da177e4 LT |
515 | switch (cx->type) { |
516 | ||
517 | case ACPI_STATE_C1: | |
518 | /* | |
519 | * Invoke C1. | |
520 | * Use the appropriate idle routine, the one that would | |
521 | * be used without acpi C-states. | |
522 | */ | |
523 | if (pm_idle_save) | |
524 | pm_idle_save(); | |
525 | else | |
64c7c8f8 NP |
526 | acpi_safe_halt(); |
527 | ||
1da177e4 | 528 | /* |
4be44fcd | 529 | * TBD: Can't get time duration while in C1, as resumes |
1da177e4 LT |
530 | * go to an ISR rather than here. Need to instrument |
531 | * base interrupt handler. | |
2aa44d05 IM |
532 | * |
533 | * Note: the TSC better not stop in C1, sched_clock() will | |
534 | * skew otherwise. | |
1da177e4 LT |
535 | */ |
536 | sleep_ticks = 0xFFFFFFFF; | |
71e93d15 VP |
537 | if (irqs_disabled()) |
538 | local_irq_enable(); | |
539 | ||
1da177e4 LT |
540 | break; |
541 | ||
542 | case ACPI_STATE_C2: | |
543 | /* Get start time (ticks) */ | |
cee324b1 | 544 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
2aa44d05 IM |
545 | /* Tell the scheduler that we are going deep-idle: */ |
546 | sched_clock_idle_sleep_event(); | |
1da177e4 | 547 | /* Invoke C2 */ |
e9e2cdb4 | 548 | acpi_state_timer_broadcast(pr, cx, 1); |
991528d7 | 549 | acpi_cstate_enter(cx); |
1da177e4 | 550 | /* Get end time (ticks) */ |
cee324b1 | 551 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
539eb11e | 552 | |
61331168 | 553 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86) |
539eb11e | 554 | /* TSC halts in C2, so notify users */ |
ddb25f9a AK |
555 | if (tsc_halts_in_c(ACPI_STATE_C2)) |
556 | mark_tsc_unstable("possible TSC halt in C2"); | |
539eb11e | 557 | #endif |
2aa44d05 IM |
558 | /* Compute time (ticks) that we were actually asleep */ |
559 | sleep_ticks = ticks_elapsed(t1, t2); | |
560 | ||
561 | /* Tell the scheduler how much we idled: */ | |
562 | sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); | |
563 | ||
1da177e4 LT |
564 | /* Re-enable interrupts */ |
565 | local_irq_enable(); | |
2aa44d05 IM |
566 | /* Do not account our idle-switching overhead: */ |
567 | sleep_ticks -= cx->latency_ticks + C2_OVERHEAD; | |
568 | ||
495ab9c0 | 569 | current_thread_info()->status |= TS_POLLING; |
e9e2cdb4 | 570 | acpi_state_timer_broadcast(pr, cx, 0); |
1da177e4 LT |
571 | break; |
572 | ||
573 | case ACPI_STATE_C3: | |
bde6f5f5 | 574 | acpi_unlazy_tlb(smp_processor_id()); |
e17bcb43 TG |
575 | /* |
576 | * Must be done before busmaster disable as we might | |
577 | * need to access HPET ! | |
578 | */ | |
579 | acpi_state_timer_broadcast(pr, cx, 1); | |
18eab855 VP |
580 | /* |
581 | * disable bus master | |
582 | * bm_check implies we need ARB_DIS | |
583 | * !bm_check implies we need cache flush | |
584 | * bm_control implies whether we can do ARB_DIS | |
585 | * | |
586 | * That leaves a case where bm_check is set and bm_control is | |
587 | * not set. In that case we cannot do much, we enter C3 | |
588 | * without doing anything. | |
589 | */ | |
590 | if (pr->flags.bm_check && pr->flags.bm_control) { | |
02df8b93 | 591 | if (atomic_inc_return(&c3_cpu_count) == |
4be44fcd | 592 | num_online_cpus()) { |
02df8b93 VP |
593 | /* |
594 | * All CPUs are trying to go to C3 | |
595 | * Disable bus master arbitration | |
596 | */ | |
d8c71b6d | 597 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1); |
02df8b93 | 598 | } |
18eab855 | 599 | } else if (!pr->flags.bm_check) { |
02df8b93 VP |
600 | /* SMP with no shared cache... Invalidate cache */ |
601 | ACPI_FLUSH_CPU_CACHE(); | |
602 | } | |
4be44fcd | 603 | |
1da177e4 | 604 | /* Get start time (ticks) */ |
cee324b1 | 605 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
1da177e4 | 606 | /* Invoke C3 */ |
2aa44d05 IM |
607 | /* Tell the scheduler that we are going deep-idle: */ |
608 | sched_clock_idle_sleep_event(); | |
991528d7 | 609 | acpi_cstate_enter(cx); |
1da177e4 | 610 | /* Get end time (ticks) */ |
cee324b1 | 611 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
18eab855 | 612 | if (pr->flags.bm_check && pr->flags.bm_control) { |
02df8b93 VP |
613 | /* Enable bus master arbitration */ |
614 | atomic_dec(&c3_cpu_count); | |
d8c71b6d | 615 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0); |
02df8b93 VP |
616 | } |
617 | ||
61331168 | 618 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86) |
539eb11e | 619 | /* TSC halts in C3, so notify users */ |
ddb25f9a AK |
620 | if (tsc_halts_in_c(ACPI_STATE_C3)) |
621 | mark_tsc_unstable("TSC halts in C3"); | |
539eb11e | 622 | #endif |
2aa44d05 IM |
623 | /* Compute time (ticks) that we were actually asleep */ |
624 | sleep_ticks = ticks_elapsed(t1, t2); | |
625 | /* Tell the scheduler how much we idled: */ | |
626 | sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); | |
627 | ||
1da177e4 LT |
628 | /* Re-enable interrupts */ |
629 | local_irq_enable(); | |
2aa44d05 IM |
630 | /* Do not account our idle-switching overhead: */ |
631 | sleep_ticks -= cx->latency_ticks + C3_OVERHEAD; | |
632 | ||
495ab9c0 | 633 | current_thread_info()->status |= TS_POLLING; |
e9e2cdb4 | 634 | acpi_state_timer_broadcast(pr, cx, 0); |
1da177e4 LT |
635 | break; |
636 | ||
637 | default: | |
638 | local_irq_enable(); | |
639 | return; | |
640 | } | |
a3c6598f DB |
641 | cx->usage++; |
642 | if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0)) | |
643 | cx->time += sleep_ticks; | |
1da177e4 LT |
644 | |
645 | next_state = pr->power.state; | |
646 | ||
1e483969 DSL |
647 | #ifdef CONFIG_HOTPLUG_CPU |
648 | /* Don't do promotion/demotion */ | |
649 | if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) && | |
cee324b1 | 650 | !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) { |
1e483969 DSL |
651 | next_state = cx; |
652 | goto end; | |
653 | } | |
654 | #endif | |
655 | ||
1da177e4 LT |
656 | /* |
657 | * Promotion? | |
658 | * ---------- | |
659 | * Track the number of longs (time asleep is greater than threshold) | |
660 | * and promote when the count threshold is reached. Note that bus | |
661 | * mastering activity may prevent promotions. | |
662 | * Do not promote above max_cstate. | |
663 | */ | |
664 | if (cx->promotion.state && | |
665 | ((cx->promotion.state - pr->power.states) <= max_cstate)) { | |
5c87579e | 666 | if (sleep_ticks > cx->promotion.threshold.ticks && |
f011e2e2 MG |
667 | cx->promotion.state->latency <= |
668 | pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY)) { | |
1da177e4 | 669 | cx->promotion.count++; |
4be44fcd LB |
670 | cx->demotion.count = 0; |
671 | if (cx->promotion.count >= | |
672 | cx->promotion.threshold.count) { | |
1da177e4 | 673 | if (pr->flags.bm_check) { |
4be44fcd LB |
674 | if (! |
675 | (pr->power.bm_activity & cx-> | |
676 | promotion.threshold.bm)) { | |
677 | next_state = | |
678 | cx->promotion.state; | |
1da177e4 LT |
679 | goto end; |
680 | } | |
4be44fcd | 681 | } else { |
1da177e4 LT |
682 | next_state = cx->promotion.state; |
683 | goto end; | |
684 | } | |
685 | } | |
686 | } | |
687 | } | |
688 | ||
689 | /* | |
690 | * Demotion? | |
691 | * --------- | |
692 | * Track the number of shorts (time asleep is less than time threshold) | |
693 | * and demote when the usage threshold is reached. | |
694 | */ | |
695 | if (cx->demotion.state) { | |
696 | if (sleep_ticks < cx->demotion.threshold.ticks) { | |
697 | cx->demotion.count++; | |
698 | cx->promotion.count = 0; | |
699 | if (cx->demotion.count >= cx->demotion.threshold.count) { | |
700 | next_state = cx->demotion.state; | |
701 | goto end; | |
702 | } | |
703 | } | |
704 | } | |
705 | ||
4be44fcd | 706 | end: |
1da177e4 LT |
707 | /* |
708 | * Demote if current state exceeds max_cstate | |
5c87579e | 709 | * or if the latency of the current state is unacceptable |
1da177e4 | 710 | */ |
5c87579e | 711 | if ((pr->power.state - pr->power.states) > max_cstate || |
f011e2e2 MG |
712 | pr->power.state->latency > |
713 | pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY)) { | |
1da177e4 LT |
714 | if (cx->demotion.state) |
715 | next_state = cx->demotion.state; | |
716 | } | |
717 | ||
718 | /* | |
719 | * New Cx State? | |
720 | * ------------- | |
721 | * If we're going to start using a new Cx state we must clean up | |
722 | * from the previous and prepare to use the new. | |
723 | */ | |
724 | if (next_state != pr->power.state) | |
725 | acpi_processor_power_activate(pr, next_state); | |
1da177e4 LT |
726 | } |
727 | ||
4be44fcd | 728 | static int acpi_processor_set_power_policy(struct acpi_processor *pr) |
1da177e4 LT |
729 | { |
730 | unsigned int i; | |
731 | unsigned int state_is_set = 0; | |
732 | struct acpi_processor_cx *lower = NULL; | |
733 | struct acpi_processor_cx *higher = NULL; | |
734 | struct acpi_processor_cx *cx; | |
735 | ||
1da177e4 LT |
736 | |
737 | if (!pr) | |
d550d98d | 738 | return -EINVAL; |
1da177e4 LT |
739 | |
740 | /* | |
741 | * This function sets the default Cx state policy (OS idle handler). | |
742 | * Our scheme is to promote quickly to C2 but more conservatively | |
743 | * to C3. We're favoring C2 for its characteristics of low latency | |
744 | * (quick response), good power savings, and ability to allow bus | |
745 | * mastering activity. Note that the Cx state policy is completely | |
746 | * customizable and can be altered dynamically. | |
747 | */ | |
748 | ||
749 | /* startup state */ | |
4be44fcd | 750 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
751 | cx = &pr->power.states[i]; |
752 | if (!cx->valid) | |
753 | continue; | |
754 | ||
755 | if (!state_is_set) | |
756 | pr->power.state = cx; | |
757 | state_is_set++; | |
758 | break; | |
4be44fcd | 759 | } |
1da177e4 LT |
760 | |
761 | if (!state_is_set) | |
d550d98d | 762 | return -ENODEV; |
1da177e4 LT |
763 | |
764 | /* demotion */ | |
4be44fcd | 765 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
766 | cx = &pr->power.states[i]; |
767 | if (!cx->valid) | |
768 | continue; | |
769 | ||
770 | if (lower) { | |
771 | cx->demotion.state = lower; | |
772 | cx->demotion.threshold.ticks = cx->latency_ticks; | |
773 | cx->demotion.threshold.count = 1; | |
774 | if (cx->type == ACPI_STATE_C3) | |
775 | cx->demotion.threshold.bm = bm_history; | |
776 | } | |
777 | ||
778 | lower = cx; | |
779 | } | |
780 | ||
781 | /* promotion */ | |
782 | for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) { | |
783 | cx = &pr->power.states[i]; | |
784 | if (!cx->valid) | |
785 | continue; | |
786 | ||
787 | if (higher) { | |
4be44fcd | 788 | cx->promotion.state = higher; |
1da177e4 LT |
789 | cx->promotion.threshold.ticks = cx->latency_ticks; |
790 | if (cx->type >= ACPI_STATE_C2) | |
791 | cx->promotion.threshold.count = 4; | |
792 | else | |
793 | cx->promotion.threshold.count = 10; | |
794 | if (higher->type == ACPI_STATE_C3) | |
795 | cx->promotion.threshold.bm = bm_history; | |
796 | } | |
797 | ||
798 | higher = cx; | |
799 | } | |
800 | ||
d550d98d | 801 | return 0; |
1da177e4 | 802 | } |
4f86d3a8 | 803 | #endif /* !CONFIG_CPU_IDLE */ |
1da177e4 | 804 | |
4be44fcd | 805 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
1da177e4 | 806 | { |
1da177e4 LT |
807 | |
808 | if (!pr) | |
d550d98d | 809 | return -EINVAL; |
1da177e4 LT |
810 | |
811 | if (!pr->pblk) | |
d550d98d | 812 | return -ENODEV; |
1da177e4 | 813 | |
1da177e4 | 814 | /* if info is obtained from pblk/fadt, type equals state */ |
1da177e4 LT |
815 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
816 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; | |
817 | ||
4c033552 VP |
818 | #ifndef CONFIG_HOTPLUG_CPU |
819 | /* | |
820 | * Check for P_LVL2_UP flag before entering C2 and above on | |
4f86d3a8 | 821 | * an SMP system. |
4c033552 | 822 | */ |
ad71860a | 823 | if ((num_online_cpus() > 1) && |
cee324b1 | 824 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
d550d98d | 825 | return -ENODEV; |
4c033552 VP |
826 | #endif |
827 | ||
1da177e4 LT |
828 | /* determine C2 and C3 address from pblk */ |
829 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; | |
830 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; | |
831 | ||
832 | /* determine latencies from FADT */ | |
cee324b1 AS |
833 | pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency; |
834 | pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency; | |
1da177e4 LT |
835 | |
836 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
837 | "lvl2[0x%08x] lvl3[0x%08x]\n", | |
838 | pr->power.states[ACPI_STATE_C2].address, | |
839 | pr->power.states[ACPI_STATE_C3].address)); | |
840 | ||
d550d98d | 841 | return 0; |
1da177e4 LT |
842 | } |
843 | ||
991528d7 | 844 | static int acpi_processor_get_power_info_default(struct acpi_processor *pr) |
acf05f4b | 845 | { |
991528d7 VP |
846 | if (!pr->power.states[ACPI_STATE_C1].valid) { |
847 | /* set the first C-State to C1 */ | |
848 | /* all processors need to support C1 */ | |
849 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; | |
850 | pr->power.states[ACPI_STATE_C1].valid = 1; | |
851 | } | |
852 | /* the C0 state only exists as a filler in our array */ | |
acf05f4b | 853 | pr->power.states[ACPI_STATE_C0].valid = 1; |
d550d98d | 854 | return 0; |
acf05f4b VP |
855 | } |
856 | ||
4be44fcd | 857 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
1da177e4 | 858 | { |
4be44fcd LB |
859 | acpi_status status = 0; |
860 | acpi_integer count; | |
cf824788 | 861 | int current_count; |
4be44fcd LB |
862 | int i; |
863 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
864 | union acpi_object *cst; | |
1da177e4 | 865 | |
1da177e4 | 866 | |
1da177e4 | 867 | if (nocst) |
d550d98d | 868 | return -ENODEV; |
1da177e4 | 869 | |
991528d7 | 870 | current_count = 0; |
1da177e4 LT |
871 | |
872 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); | |
873 | if (ACPI_FAILURE(status)) { | |
874 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); | |
d550d98d | 875 | return -ENODEV; |
4be44fcd | 876 | } |
1da177e4 | 877 | |
50dd0969 | 878 | cst = buffer.pointer; |
1da177e4 LT |
879 | |
880 | /* There must be at least 2 elements */ | |
881 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { | |
6468463a | 882 | printk(KERN_ERR PREFIX "not enough elements in _CST\n"); |
1da177e4 LT |
883 | status = -EFAULT; |
884 | goto end; | |
885 | } | |
886 | ||
887 | count = cst->package.elements[0].integer.value; | |
888 | ||
889 | /* Validate number of power states. */ | |
890 | if (count < 1 || count != cst->package.count - 1) { | |
6468463a | 891 | printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); |
1da177e4 LT |
892 | status = -EFAULT; |
893 | goto end; | |
894 | } | |
895 | ||
1da177e4 LT |
896 | /* Tell driver that at least _CST is supported. */ |
897 | pr->flags.has_cst = 1; | |
898 | ||
899 | for (i = 1; i <= count; i++) { | |
900 | union acpi_object *element; | |
901 | union acpi_object *obj; | |
902 | struct acpi_power_register *reg; | |
903 | struct acpi_processor_cx cx; | |
904 | ||
905 | memset(&cx, 0, sizeof(cx)); | |
906 | ||
50dd0969 | 907 | element = &(cst->package.elements[i]); |
1da177e4 LT |
908 | if (element->type != ACPI_TYPE_PACKAGE) |
909 | continue; | |
910 | ||
911 | if (element->package.count != 4) | |
912 | continue; | |
913 | ||
50dd0969 | 914 | obj = &(element->package.elements[0]); |
1da177e4 LT |
915 | |
916 | if (obj->type != ACPI_TYPE_BUFFER) | |
917 | continue; | |
918 | ||
4be44fcd | 919 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
1da177e4 LT |
920 | |
921 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && | |
4be44fcd | 922 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
1da177e4 LT |
923 | continue; |
924 | ||
1da177e4 | 925 | /* There should be an easy way to extract an integer... */ |
50dd0969 | 926 | obj = &(element->package.elements[1]); |
1da177e4 LT |
927 | if (obj->type != ACPI_TYPE_INTEGER) |
928 | continue; | |
929 | ||
930 | cx.type = obj->integer.value; | |
991528d7 VP |
931 | /* |
932 | * Some buggy BIOSes won't list C1 in _CST - | |
933 | * Let acpi_processor_get_power_info_default() handle them later | |
934 | */ | |
935 | if (i == 1 && cx.type != ACPI_STATE_C1) | |
936 | current_count++; | |
937 | ||
938 | cx.address = reg->address; | |
939 | cx.index = current_count + 1; | |
940 | ||
bc71bec9 | 941 | cx.entry_method = ACPI_CSTATE_SYSTEMIO; |
991528d7 VP |
942 | if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { |
943 | if (acpi_processor_ffh_cstate_probe | |
944 | (pr->id, &cx, reg) == 0) { | |
bc71bec9 | 945 | cx.entry_method = ACPI_CSTATE_FFH; |
946 | } else if (cx.type == ACPI_STATE_C1) { | |
991528d7 VP |
947 | /* |
948 | * C1 is a special case where FIXED_HARDWARE | |
949 | * can be handled in non-MWAIT way as well. | |
950 | * In that case, save this _CST entry info. | |
991528d7 VP |
951 | * Otherwise, ignore this info and continue. |
952 | */ | |
bc71bec9 | 953 | cx.entry_method = ACPI_CSTATE_HALT; |
4fcb2fcd | 954 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
bc71bec9 | 955 | } else { |
991528d7 VP |
956 | continue; |
957 | } | |
4fcb2fcd VP |
958 | } else { |
959 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", | |
960 | cx.address); | |
991528d7 | 961 | } |
1da177e4 | 962 | |
4fcb2fcd | 963 | |
50dd0969 | 964 | obj = &(element->package.elements[2]); |
1da177e4 LT |
965 | if (obj->type != ACPI_TYPE_INTEGER) |
966 | continue; | |
967 | ||
968 | cx.latency = obj->integer.value; | |
969 | ||
50dd0969 | 970 | obj = &(element->package.elements[3]); |
1da177e4 LT |
971 | if (obj->type != ACPI_TYPE_INTEGER) |
972 | continue; | |
973 | ||
974 | cx.power = obj->integer.value; | |
975 | ||
cf824788 JM |
976 | current_count++; |
977 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); | |
978 | ||
979 | /* | |
980 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 | |
981 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) | |
982 | */ | |
983 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { | |
984 | printk(KERN_WARNING | |
985 | "Limiting number of power states to max (%d)\n", | |
986 | ACPI_PROCESSOR_MAX_POWER); | |
987 | printk(KERN_WARNING | |
988 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); | |
989 | break; | |
990 | } | |
1da177e4 LT |
991 | } |
992 | ||
4be44fcd | 993 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
cf824788 | 994 | current_count)); |
1da177e4 LT |
995 | |
996 | /* Validate number of power states discovered */ | |
cf824788 | 997 | if (current_count < 2) |
6d93c648 | 998 | status = -EFAULT; |
1da177e4 | 999 | |
4be44fcd | 1000 | end: |
02438d87 | 1001 | kfree(buffer.pointer); |
1da177e4 | 1002 | |
d550d98d | 1003 | return status; |
1da177e4 LT |
1004 | } |
1005 | ||
1da177e4 LT |
1006 | static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) |
1007 | { | |
1da177e4 LT |
1008 | |
1009 | if (!cx->address) | |
d550d98d | 1010 | return; |
1da177e4 LT |
1011 | |
1012 | /* | |
1013 | * C2 latency must be less than or equal to 100 | |
1014 | * microseconds. | |
1015 | */ | |
1016 | else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { | |
1017 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 1018 | "latency too large [%d]\n", cx->latency)); |
d550d98d | 1019 | return; |
1da177e4 LT |
1020 | } |
1021 | ||
1da177e4 LT |
1022 | /* |
1023 | * Otherwise we've met all of our C2 requirements. | |
1024 | * Normalize the C2 latency to expidite policy | |
1025 | */ | |
1026 | cx->valid = 1; | |
4f86d3a8 LB |
1027 | |
1028 | #ifndef CONFIG_CPU_IDLE | |
1da177e4 | 1029 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
4f86d3a8 LB |
1030 | #else |
1031 | cx->latency_ticks = cx->latency; | |
1032 | #endif | |
1da177e4 | 1033 | |
d550d98d | 1034 | return; |
1da177e4 LT |
1035 | } |
1036 | ||
4be44fcd LB |
1037 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
1038 | struct acpi_processor_cx *cx) | |
1da177e4 | 1039 | { |
02df8b93 VP |
1040 | static int bm_check_flag; |
1041 | ||
1da177e4 LT |
1042 | |
1043 | if (!cx->address) | |
d550d98d | 1044 | return; |
1da177e4 LT |
1045 | |
1046 | /* | |
1047 | * C3 latency must be less than or equal to 1000 | |
1048 | * microseconds. | |
1049 | */ | |
1050 | else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { | |
1051 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 1052 | "latency too large [%d]\n", cx->latency)); |
d550d98d | 1053 | return; |
1da177e4 LT |
1054 | } |
1055 | ||
1da177e4 LT |
1056 | /* |
1057 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) | |
1058 | * DMA transfers are used by any ISA device to avoid livelock. | |
1059 | * Note that we could disable Type-F DMA (as recommended by | |
1060 | * the erratum), but this is known to disrupt certain ISA | |
1061 | * devices thus we take the conservative approach. | |
1062 | */ | |
1063 | else if (errata.piix4.fdma) { | |
1064 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 1065 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
d550d98d | 1066 | return; |
1da177e4 LT |
1067 | } |
1068 | ||
02df8b93 VP |
1069 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
1070 | if (!bm_check_flag) { | |
1071 | /* Determine whether bm_check is needed based on CPU */ | |
1072 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); | |
1073 | bm_check_flag = pr->flags.bm_check; | |
1074 | } else { | |
1075 | pr->flags.bm_check = bm_check_flag; | |
1076 | } | |
1077 | ||
1078 | if (pr->flags.bm_check) { | |
02df8b93 | 1079 | if (!pr->flags.bm_control) { |
ed3110ef VP |
1080 | if (pr->flags.has_cst != 1) { |
1081 | /* bus mastering control is necessary */ | |
1082 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1083 | "C3 support requires BM control\n")); | |
1084 | return; | |
1085 | } else { | |
1086 | /* Here we enter C3 without bus mastering */ | |
1087 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1088 | "C3 support without BM control\n")); | |
1089 | } | |
02df8b93 VP |
1090 | } |
1091 | } else { | |
02df8b93 VP |
1092 | /* |
1093 | * WBINVD should be set in fadt, for C3 state to be | |
1094 | * supported on when bm_check is not required. | |
1095 | */ | |
cee324b1 | 1096 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { |
02df8b93 | 1097 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
1098 | "Cache invalidation should work properly" |
1099 | " for C3 to be enabled on SMP systems\n")); | |
d550d98d | 1100 | return; |
02df8b93 | 1101 | } |
d8c71b6d | 1102 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); |
02df8b93 VP |
1103 | } |
1104 | ||
1da177e4 LT |
1105 | /* |
1106 | * Otherwise we've met all of our C3 requirements. | |
1107 | * Normalize the C3 latency to expidite policy. Enable | |
1108 | * checking of bus mastering status (bm_check) so we can | |
1109 | * use this in our C3 policy | |
1110 | */ | |
1111 | cx->valid = 1; | |
4f86d3a8 LB |
1112 | |
1113 | #ifndef CONFIG_CPU_IDLE | |
1da177e4 | 1114 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
4f86d3a8 LB |
1115 | #else |
1116 | cx->latency_ticks = cx->latency; | |
1117 | #endif | |
1da177e4 | 1118 | |
d550d98d | 1119 | return; |
1da177e4 LT |
1120 | } |
1121 | ||
1da177e4 LT |
1122 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
1123 | { | |
1124 | unsigned int i; | |
1125 | unsigned int working = 0; | |
6eb0a0fd | 1126 | |
169a0abb | 1127 | pr->power.timer_broadcast_on_state = INT_MAX; |
6eb0a0fd | 1128 | |
4be44fcd | 1129 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
1da177e4 LT |
1130 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
1131 | ||
1132 | switch (cx->type) { | |
1133 | case ACPI_STATE_C1: | |
1134 | cx->valid = 1; | |
1135 | break; | |
1136 | ||
1137 | case ACPI_STATE_C2: | |
1138 | acpi_processor_power_verify_c2(cx); | |
296d93cd | 1139 | if (cx->valid) |
169a0abb | 1140 | acpi_timer_check_state(i, pr, cx); |
1da177e4 LT |
1141 | break; |
1142 | ||
1143 | case ACPI_STATE_C3: | |
1144 | acpi_processor_power_verify_c3(pr, cx); | |
296d93cd | 1145 | if (cx->valid) |
169a0abb | 1146 | acpi_timer_check_state(i, pr, cx); |
1da177e4 LT |
1147 | break; |
1148 | } | |
1149 | ||
1150 | if (cx->valid) | |
1151 | working++; | |
1152 | } | |
bd663347 | 1153 | |
169a0abb | 1154 | acpi_propagate_timer_broadcast(pr); |
1da177e4 LT |
1155 | |
1156 | return (working); | |
1157 | } | |
1158 | ||
4be44fcd | 1159 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
1da177e4 LT |
1160 | { |
1161 | unsigned int i; | |
1162 | int result; | |
1163 | ||
1da177e4 LT |
1164 | |
1165 | /* NOTE: the idle thread may not be running while calling | |
1166 | * this function */ | |
1167 | ||
991528d7 VP |
1168 | /* Zero initialize all the C-states info. */ |
1169 | memset(pr->power.states, 0, sizeof(pr->power.states)); | |
1170 | ||
1da177e4 | 1171 | result = acpi_processor_get_power_info_cst(pr); |
6d93c648 | 1172 | if (result == -ENODEV) |
c5a114f1 | 1173 | result = acpi_processor_get_power_info_fadt(pr); |
6d93c648 | 1174 | |
991528d7 VP |
1175 | if (result) |
1176 | return result; | |
1177 | ||
1178 | acpi_processor_get_power_info_default(pr); | |
1179 | ||
cf824788 | 1180 | pr->power.count = acpi_processor_power_verify(pr); |
1da177e4 | 1181 | |
4f86d3a8 | 1182 | #ifndef CONFIG_CPU_IDLE |
1da177e4 LT |
1183 | /* |
1184 | * Set Default Policy | |
1185 | * ------------------ | |
1186 | * Now that we know which states are supported, set the default | |
1187 | * policy. Note that this policy can be changed dynamically | |
1188 | * (e.g. encourage deeper sleeps to conserve battery life when | |
1189 | * not on AC). | |
1190 | */ | |
1191 | result = acpi_processor_set_power_policy(pr); | |
1192 | if (result) | |
d550d98d | 1193 | return result; |
4f86d3a8 | 1194 | #endif |
1da177e4 LT |
1195 | |
1196 | /* | |
1197 | * if one state of type C2 or C3 is available, mark this | |
1198 | * CPU as being "idle manageable" | |
1199 | */ | |
1200 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { | |
acf05f4b | 1201 | if (pr->power.states[i].valid) { |
1da177e4 | 1202 | pr->power.count = i; |
2203d6ed LT |
1203 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
1204 | pr->flags.power = 1; | |
acf05f4b | 1205 | } |
1da177e4 LT |
1206 | } |
1207 | ||
d550d98d | 1208 | return 0; |
1da177e4 LT |
1209 | } |
1210 | ||
1da177e4 LT |
1211 | static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) |
1212 | { | |
50dd0969 | 1213 | struct acpi_processor *pr = seq->private; |
4be44fcd | 1214 | unsigned int i; |
1da177e4 | 1215 | |
1da177e4 LT |
1216 | |
1217 | if (!pr) | |
1218 | goto end; | |
1219 | ||
1220 | seq_printf(seq, "active state: C%zd\n" | |
4be44fcd | 1221 | "max_cstate: C%d\n" |
5c87579e AV |
1222 | "bus master activity: %08x\n" |
1223 | "maximum allowed latency: %d usec\n", | |
4be44fcd | 1224 | pr->power.state ? pr->power.state - pr->power.states : 0, |
5c87579e | 1225 | max_cstate, (unsigned)pr->power.bm_activity, |
f011e2e2 | 1226 | pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY)); |
1da177e4 LT |
1227 | |
1228 | seq_puts(seq, "states:\n"); | |
1229 | ||
1230 | for (i = 1; i <= pr->power.count; i++) { | |
1231 | seq_printf(seq, " %cC%d: ", | |
4be44fcd LB |
1232 | (&pr->power.states[i] == |
1233 | pr->power.state ? '*' : ' '), i); | |
1da177e4 LT |
1234 | |
1235 | if (!pr->power.states[i].valid) { | |
1236 | seq_puts(seq, "<not supported>\n"); | |
1237 | continue; | |
1238 | } | |
1239 | ||
1240 | switch (pr->power.states[i].type) { | |
1241 | case ACPI_STATE_C1: | |
1242 | seq_printf(seq, "type[C1] "); | |
1243 | break; | |
1244 | case ACPI_STATE_C2: | |
1245 | seq_printf(seq, "type[C2] "); | |
1246 | break; | |
1247 | case ACPI_STATE_C3: | |
1248 | seq_printf(seq, "type[C3] "); | |
1249 | break; | |
1250 | default: | |
1251 | seq_printf(seq, "type[--] "); | |
1252 | break; | |
1253 | } | |
1254 | ||
1255 | if (pr->power.states[i].promotion.state) | |
1256 | seq_printf(seq, "promotion[C%zd] ", | |
4be44fcd LB |
1257 | (pr->power.states[i].promotion.state - |
1258 | pr->power.states)); | |
1da177e4 LT |
1259 | else |
1260 | seq_puts(seq, "promotion[--] "); | |
1261 | ||
1262 | if (pr->power.states[i].demotion.state) | |
1263 | seq_printf(seq, "demotion[C%zd] ", | |
4be44fcd LB |
1264 | (pr->power.states[i].demotion.state - |
1265 | pr->power.states)); | |
1da177e4 LT |
1266 | else |
1267 | seq_puts(seq, "demotion[--] "); | |
1268 | ||
a3c6598f | 1269 | seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n", |
4be44fcd | 1270 | pr->power.states[i].latency, |
a3c6598f | 1271 | pr->power.states[i].usage, |
b0b7eaaf | 1272 | (unsigned long long)pr->power.states[i].time); |
1da177e4 LT |
1273 | } |
1274 | ||
4be44fcd | 1275 | end: |
d550d98d | 1276 | return 0; |
1da177e4 LT |
1277 | } |
1278 | ||
1279 | static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) | |
1280 | { | |
1281 | return single_open(file, acpi_processor_power_seq_show, | |
4be44fcd | 1282 | PDE(inode)->data); |
1da177e4 LT |
1283 | } |
1284 | ||
d7508032 | 1285 | static const struct file_operations acpi_processor_power_fops = { |
4be44fcd LB |
1286 | .open = acpi_processor_power_open_fs, |
1287 | .read = seq_read, | |
1288 | .llseek = seq_lseek, | |
1289 | .release = single_release, | |
1da177e4 LT |
1290 | }; |
1291 | ||
4f86d3a8 LB |
1292 | #ifndef CONFIG_CPU_IDLE |
1293 | ||
1294 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) | |
1295 | { | |
1296 | int result = 0; | |
1297 | ||
1298 | ||
1299 | if (!pr) | |
1300 | return -EINVAL; | |
1301 | ||
1302 | if (nocst) { | |
1303 | return -ENODEV; | |
1304 | } | |
1305 | ||
1306 | if (!pr->flags.power_setup_done) | |
1307 | return -ENODEV; | |
1308 | ||
1309 | /* Fall back to the default idle loop */ | |
1310 | pm_idle = pm_idle_save; | |
1311 | synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ | |
1312 | ||
1313 | pr->flags.power = 0; | |
1314 | result = acpi_processor_get_power_info(pr); | |
1315 | if ((pr->flags.power == 1) && (pr->flags.power_setup_done)) | |
1316 | pm_idle = acpi_processor_idle; | |
1317 | ||
1318 | return result; | |
1319 | } | |
1320 | ||
1fec74a9 | 1321 | #ifdef CONFIG_SMP |
5c87579e AV |
1322 | static void smp_callback(void *v) |
1323 | { | |
1324 | /* we already woke the CPU up, nothing more to do */ | |
1325 | } | |
1326 | ||
1327 | /* | |
1328 | * This function gets called when a part of the kernel has a new latency | |
1329 | * requirement. This means we need to get all processors out of their C-state, | |
1330 | * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that | |
1331 | * wakes them all right up. | |
1332 | */ | |
1333 | static int acpi_processor_latency_notify(struct notifier_block *b, | |
1334 | unsigned long l, void *v) | |
1335 | { | |
1336 | smp_call_function(smp_callback, NULL, 0, 1); | |
1337 | return NOTIFY_OK; | |
1338 | } | |
1339 | ||
1340 | static struct notifier_block acpi_processor_latency_notifier = { | |
1341 | .notifier_call = acpi_processor_latency_notify, | |
1342 | }; | |
4f86d3a8 LB |
1343 | |
1344 | #endif | |
1345 | ||
1346 | #else /* CONFIG_CPU_IDLE */ | |
1347 | ||
1348 | /** | |
1349 | * acpi_idle_bm_check - checks if bus master activity was detected | |
1350 | */ | |
1351 | static int acpi_idle_bm_check(void) | |
1352 | { | |
1353 | u32 bm_status = 0; | |
1354 | ||
1355 | acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); | |
1356 | if (bm_status) | |
1357 | acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); | |
1358 | /* | |
1359 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect | |
1360 | * the true state of bus mastering activity; forcing us to | |
1361 | * manually check the BMIDEA bit of each IDE channel. | |
1362 | */ | |
1363 | else if (errata.piix4.bmisx) { | |
1364 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) | |
1365 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) | |
1366 | bm_status = 1; | |
1367 | } | |
1368 | return bm_status; | |
1369 | } | |
1370 | ||
1371 | /** | |
1372 | * acpi_idle_update_bm_rld - updates the BM_RLD bit depending on target state | |
1373 | * @pr: the processor | |
1374 | * @target: the new target state | |
1375 | */ | |
1376 | static inline void acpi_idle_update_bm_rld(struct acpi_processor *pr, | |
1377 | struct acpi_processor_cx *target) | |
1378 | { | |
1379 | if (pr->flags.bm_rld_set && target->type != ACPI_STATE_C3) { | |
1380 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); | |
1381 | pr->flags.bm_rld_set = 0; | |
1382 | } | |
1383 | ||
1384 | if (!pr->flags.bm_rld_set && target->type == ACPI_STATE_C3) { | |
1385 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1); | |
1386 | pr->flags.bm_rld_set = 1; | |
1387 | } | |
1388 | } | |
1389 | ||
1390 | /** | |
1391 | * acpi_idle_do_entry - a helper function that does C2 and C3 type entry | |
1392 | * @cx: cstate data | |
bc71bec9 | 1393 | * |
1394 | * Caller disables interrupt before call and enables interrupt after return. | |
4f86d3a8 LB |
1395 | */ |
1396 | static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) | |
1397 | { | |
bc71bec9 | 1398 | if (cx->entry_method == ACPI_CSTATE_FFH) { |
4f86d3a8 LB |
1399 | /* Call into architectural FFH based C-state */ |
1400 | acpi_processor_ffh_cstate_enter(cx); | |
bc71bec9 | 1401 | } else if (cx->entry_method == ACPI_CSTATE_HALT) { |
1402 | acpi_safe_halt(); | |
4f86d3a8 LB |
1403 | } else { |
1404 | int unused; | |
1405 | /* IO port based C-state */ | |
1406 | inb(cx->address); | |
1407 | /* Dummy wait op - must do something useless after P_LVL2 read | |
1408 | because chipsets cannot guarantee that STPCLK# signal | |
1409 | gets asserted in time to freeze execution properly. */ | |
1410 | unused = inl(acpi_gbl_FADT.xpm_timer_block.address); | |
1411 | } | |
1412 | } | |
1413 | ||
1414 | /** | |
1415 | * acpi_idle_enter_c1 - enters an ACPI C1 state-type | |
1416 | * @dev: the target CPU | |
1417 | * @state: the state data | |
1418 | * | |
1419 | * This is equivalent to the HALT instruction. | |
1420 | */ | |
1421 | static int acpi_idle_enter_c1(struct cpuidle_device *dev, | |
1422 | struct cpuidle_state *state) | |
1423 | { | |
9b12e18c | 1424 | u32 t1, t2; |
4f86d3a8 LB |
1425 | struct acpi_processor *pr; |
1426 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); | |
9b12e18c | 1427 | |
4f86d3a8 LB |
1428 | pr = processors[smp_processor_id()]; |
1429 | ||
1430 | if (unlikely(!pr)) | |
1431 | return 0; | |
1432 | ||
2e906655 | 1433 | local_irq_disable(); |
b077fbad VP |
1434 | |
1435 | /* Do not access any ACPI IO ports in suspend path */ | |
1436 | if (acpi_idle_suspend) { | |
1437 | acpi_safe_halt(); | |
1438 | local_irq_enable(); | |
1439 | return 0; | |
1440 | } | |
1441 | ||
4f86d3a8 LB |
1442 | if (pr->flags.bm_check) |
1443 | acpi_idle_update_bm_rld(pr, cx); | |
1444 | ||
9b12e18c | 1445 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
bc71bec9 | 1446 | acpi_idle_do_entry(cx); |
9b12e18c | 1447 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
4f86d3a8 | 1448 | |
2e906655 | 1449 | local_irq_enable(); |
4f86d3a8 LB |
1450 | cx->usage++; |
1451 | ||
9b12e18c | 1452 | return ticks_elapsed_in_us(t1, t2); |
4f86d3a8 LB |
1453 | } |
1454 | ||
1455 | /** | |
1456 | * acpi_idle_enter_simple - enters an ACPI state without BM handling | |
1457 | * @dev: the target CPU | |
1458 | * @state: the state data | |
1459 | */ | |
1460 | static int acpi_idle_enter_simple(struct cpuidle_device *dev, | |
1461 | struct cpuidle_state *state) | |
1462 | { | |
1463 | struct acpi_processor *pr; | |
1464 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); | |
1465 | u32 t1, t2; | |
50629118 VP |
1466 | int sleep_ticks = 0; |
1467 | ||
4f86d3a8 LB |
1468 | pr = processors[smp_processor_id()]; |
1469 | ||
1470 | if (unlikely(!pr)) | |
1471 | return 0; | |
1472 | ||
e196441b LB |
1473 | if (acpi_idle_suspend) |
1474 | return(acpi_idle_enter_c1(dev, state)); | |
1475 | ||
4f86d3a8 LB |
1476 | local_irq_disable(); |
1477 | current_thread_info()->status &= ~TS_POLLING; | |
1478 | /* | |
1479 | * TS_POLLING-cleared state must be visible before we test | |
1480 | * NEED_RESCHED: | |
1481 | */ | |
1482 | smp_mb(); | |
1483 | ||
1484 | if (unlikely(need_resched())) { | |
1485 | current_thread_info()->status |= TS_POLLING; | |
1486 | local_irq_enable(); | |
1487 | return 0; | |
1488 | } | |
1489 | ||
e17bcb43 TG |
1490 | /* |
1491 | * Must be done before busmaster disable as we might need to | |
1492 | * access HPET ! | |
1493 | */ | |
1494 | acpi_state_timer_broadcast(pr, cx, 1); | |
1495 | ||
1496 | if (pr->flags.bm_check) | |
1497 | acpi_idle_update_bm_rld(pr, cx); | |
1498 | ||
4f86d3a8 LB |
1499 | if (cx->type == ACPI_STATE_C3) |
1500 | ACPI_FLUSH_CPU_CACHE(); | |
1501 | ||
1502 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); | |
50629118 VP |
1503 | /* Tell the scheduler that we are going deep-idle: */ |
1504 | sched_clock_idle_sleep_event(); | |
4f86d3a8 LB |
1505 | acpi_idle_do_entry(cx); |
1506 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); | |
1507 | ||
61331168 | 1508 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86) |
4f86d3a8 | 1509 | /* TSC could halt in idle, so notify users */ |
ddb25f9a AK |
1510 | if (tsc_halts_in_c(cx->type)) |
1511 | mark_tsc_unstable("TSC halts in idle");; | |
4f86d3a8 | 1512 | #endif |
50629118 VP |
1513 | sleep_ticks = ticks_elapsed(t1, t2); |
1514 | ||
1515 | /* Tell the scheduler how much we idled: */ | |
1516 | sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); | |
4f86d3a8 LB |
1517 | |
1518 | local_irq_enable(); | |
1519 | current_thread_info()->status |= TS_POLLING; | |
1520 | ||
1521 | cx->usage++; | |
1522 | ||
1523 | acpi_state_timer_broadcast(pr, cx, 0); | |
50629118 | 1524 | cx->time += sleep_ticks; |
4f86d3a8 LB |
1525 | return ticks_elapsed_in_us(t1, t2); |
1526 | } | |
1527 | ||
1528 | static int c3_cpu_count; | |
1529 | static DEFINE_SPINLOCK(c3_lock); | |
1530 | ||
1531 | /** | |
1532 | * acpi_idle_enter_bm - enters C3 with proper BM handling | |
1533 | * @dev: the target CPU | |
1534 | * @state: the state data | |
1535 | * | |
1536 | * If BM is detected, the deepest non-C3 idle state is entered instead. | |
1537 | */ | |
1538 | static int acpi_idle_enter_bm(struct cpuidle_device *dev, | |
1539 | struct cpuidle_state *state) | |
1540 | { | |
1541 | struct acpi_processor *pr; | |
1542 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); | |
1543 | u32 t1, t2; | |
50629118 VP |
1544 | int sleep_ticks = 0; |
1545 | ||
4f86d3a8 LB |
1546 | pr = processors[smp_processor_id()]; |
1547 | ||
1548 | if (unlikely(!pr)) | |
1549 | return 0; | |
1550 | ||
e196441b LB |
1551 | if (acpi_idle_suspend) |
1552 | return(acpi_idle_enter_c1(dev, state)); | |
1553 | ||
ddc081a1 VP |
1554 | if (acpi_idle_bm_check()) { |
1555 | if (dev->safe_state) { | |
1556 | return dev->safe_state->enter(dev, dev->safe_state); | |
1557 | } else { | |
2e906655 | 1558 | local_irq_disable(); |
ddc081a1 | 1559 | acpi_safe_halt(); |
2e906655 | 1560 | local_irq_enable(); |
ddc081a1 VP |
1561 | return 0; |
1562 | } | |
1563 | } | |
1564 | ||
4f86d3a8 LB |
1565 | local_irq_disable(); |
1566 | current_thread_info()->status &= ~TS_POLLING; | |
1567 | /* | |
1568 | * TS_POLLING-cleared state must be visible before we test | |
1569 | * NEED_RESCHED: | |
1570 | */ | |
1571 | smp_mb(); | |
1572 | ||
1573 | if (unlikely(need_resched())) { | |
1574 | current_thread_info()->status |= TS_POLLING; | |
1575 | local_irq_enable(); | |
1576 | return 0; | |
1577 | } | |
1578 | ||
996520c1 VP |
1579 | acpi_unlazy_tlb(smp_processor_id()); |
1580 | ||
50629118 VP |
1581 | /* Tell the scheduler that we are going deep-idle: */ |
1582 | sched_clock_idle_sleep_event(); | |
4f86d3a8 LB |
1583 | /* |
1584 | * Must be done before busmaster disable as we might need to | |
1585 | * access HPET ! | |
1586 | */ | |
1587 | acpi_state_timer_broadcast(pr, cx, 1); | |
1588 | ||
ddc081a1 | 1589 | acpi_idle_update_bm_rld(pr, cx); |
4f86d3a8 | 1590 | |
ddc081a1 VP |
1591 | /* |
1592 | * disable bus master | |
1593 | * bm_check implies we need ARB_DIS | |
1594 | * !bm_check implies we need cache flush | |
1595 | * bm_control implies whether we can do ARB_DIS | |
1596 | * | |
1597 | * That leaves a case where bm_check is set and bm_control is | |
1598 | * not set. In that case we cannot do much, we enter C3 | |
1599 | * without doing anything. | |
1600 | */ | |
1601 | if (pr->flags.bm_check && pr->flags.bm_control) { | |
4f86d3a8 LB |
1602 | spin_lock(&c3_lock); |
1603 | c3_cpu_count++; | |
1604 | /* Disable bus master arbitration when all CPUs are in C3 */ | |
1605 | if (c3_cpu_count == num_online_cpus()) | |
1606 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1); | |
1607 | spin_unlock(&c3_lock); | |
ddc081a1 VP |
1608 | } else if (!pr->flags.bm_check) { |
1609 | ACPI_FLUSH_CPU_CACHE(); | |
1610 | } | |
4f86d3a8 | 1611 | |
ddc081a1 VP |
1612 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
1613 | acpi_idle_do_entry(cx); | |
1614 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); | |
4f86d3a8 | 1615 | |
ddc081a1 VP |
1616 | /* Re-enable bus master arbitration */ |
1617 | if (pr->flags.bm_check && pr->flags.bm_control) { | |
4f86d3a8 | 1618 | spin_lock(&c3_lock); |
ddc081a1 | 1619 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0); |
4f86d3a8 LB |
1620 | c3_cpu_count--; |
1621 | spin_unlock(&c3_lock); | |
1622 | } | |
1623 | ||
61331168 | 1624 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86) |
4f86d3a8 | 1625 | /* TSC could halt in idle, so notify users */ |
ddb25f9a AK |
1626 | if (tsc_halts_in_c(ACPI_STATE_C3)) |
1627 | mark_tsc_unstable("TSC halts in idle"); | |
4f86d3a8 | 1628 | #endif |
50629118 VP |
1629 | sleep_ticks = ticks_elapsed(t1, t2); |
1630 | /* Tell the scheduler how much we idled: */ | |
1631 | sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); | |
4f86d3a8 LB |
1632 | |
1633 | local_irq_enable(); | |
1634 | current_thread_info()->status |= TS_POLLING; | |
1635 | ||
1636 | cx->usage++; | |
1637 | ||
1638 | acpi_state_timer_broadcast(pr, cx, 0); | |
50629118 | 1639 | cx->time += sleep_ticks; |
4f86d3a8 LB |
1640 | return ticks_elapsed_in_us(t1, t2); |
1641 | } | |
1642 | ||
1643 | struct cpuidle_driver acpi_idle_driver = { | |
1644 | .name = "acpi_idle", | |
1645 | .owner = THIS_MODULE, | |
1646 | }; | |
1647 | ||
1648 | /** | |
1649 | * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE | |
1650 | * @pr: the ACPI processor | |
1651 | */ | |
1652 | static int acpi_processor_setup_cpuidle(struct acpi_processor *pr) | |
1653 | { | |
9a0b8415 | 1654 | int i, count = CPUIDLE_DRIVER_STATE_START; |
4f86d3a8 LB |
1655 | struct acpi_processor_cx *cx; |
1656 | struct cpuidle_state *state; | |
1657 | struct cpuidle_device *dev = &pr->power.dev; | |
1658 | ||
1659 | if (!pr->flags.power_setup_done) | |
1660 | return -EINVAL; | |
1661 | ||
1662 | if (pr->flags.power == 0) { | |
1663 | return -EINVAL; | |
1664 | } | |
1665 | ||
4fcb2fcd VP |
1666 | for (i = 0; i < CPUIDLE_STATE_MAX; i++) { |
1667 | dev->states[i].name[0] = '\0'; | |
1668 | dev->states[i].desc[0] = '\0'; | |
1669 | } | |
1670 | ||
4f86d3a8 LB |
1671 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
1672 | cx = &pr->power.states[i]; | |
1673 | state = &dev->states[count]; | |
1674 | ||
1675 | if (!cx->valid) | |
1676 | continue; | |
1677 | ||
1678 | #ifdef CONFIG_HOTPLUG_CPU | |
1679 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && | |
1680 | !pr->flags.has_cst && | |
1681 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) | |
1682 | continue; | |
1fec74a9 | 1683 | #endif |
4f86d3a8 LB |
1684 | cpuidle_set_statedata(state, cx); |
1685 | ||
1686 | snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); | |
4fcb2fcd | 1687 | strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); |
4f86d3a8 | 1688 | state->exit_latency = cx->latency; |
4963f620 | 1689 | state->target_residency = cx->latency * latency_factor; |
4f86d3a8 LB |
1690 | state->power_usage = cx->power; |
1691 | ||
1692 | state->flags = 0; | |
1693 | switch (cx->type) { | |
1694 | case ACPI_STATE_C1: | |
1695 | state->flags |= CPUIDLE_FLAG_SHALLOW; | |
8e92b660 VP |
1696 | if (cx->entry_method == ACPI_CSTATE_FFH) |
1697 | state->flags |= CPUIDLE_FLAG_TIME_VALID; | |
1698 | ||
4f86d3a8 | 1699 | state->enter = acpi_idle_enter_c1; |
ddc081a1 | 1700 | dev->safe_state = state; |
4f86d3a8 LB |
1701 | break; |
1702 | ||
1703 | case ACPI_STATE_C2: | |
1704 | state->flags |= CPUIDLE_FLAG_BALANCED; | |
1705 | state->flags |= CPUIDLE_FLAG_TIME_VALID; | |
1706 | state->enter = acpi_idle_enter_simple; | |
ddc081a1 | 1707 | dev->safe_state = state; |
4f86d3a8 LB |
1708 | break; |
1709 | ||
1710 | case ACPI_STATE_C3: | |
1711 | state->flags |= CPUIDLE_FLAG_DEEP; | |
1712 | state->flags |= CPUIDLE_FLAG_TIME_VALID; | |
1713 | state->flags |= CPUIDLE_FLAG_CHECK_BM; | |
1714 | state->enter = pr->flags.bm_check ? | |
1715 | acpi_idle_enter_bm : | |
1716 | acpi_idle_enter_simple; | |
1717 | break; | |
1718 | } | |
1719 | ||
1720 | count++; | |
9a0b8415 | 1721 | if (count == CPUIDLE_STATE_MAX) |
1722 | break; | |
4f86d3a8 LB |
1723 | } |
1724 | ||
1725 | dev->state_count = count; | |
1726 | ||
1727 | if (!count) | |
1728 | return -EINVAL; | |
1729 | ||
4f86d3a8 LB |
1730 | return 0; |
1731 | } | |
1732 | ||
1733 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) | |
1734 | { | |
1735 | int ret; | |
1736 | ||
1737 | if (!pr) | |
1738 | return -EINVAL; | |
1739 | ||
1740 | if (nocst) { | |
1741 | return -ENODEV; | |
1742 | } | |
1743 | ||
1744 | if (!pr->flags.power_setup_done) | |
1745 | return -ENODEV; | |
1746 | ||
1747 | cpuidle_pause_and_lock(); | |
1748 | cpuidle_disable_device(&pr->power.dev); | |
1749 | acpi_processor_get_power_info(pr); | |
1750 | acpi_processor_setup_cpuidle(pr); | |
1751 | ret = cpuidle_enable_device(&pr->power.dev); | |
1752 | cpuidle_resume_and_unlock(); | |
1753 | ||
1754 | return ret; | |
1755 | } | |
1756 | ||
1757 | #endif /* CONFIG_CPU_IDLE */ | |
5c87579e | 1758 | |
7af8b660 | 1759 | int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, |
4be44fcd | 1760 | struct acpi_device *device) |
1da177e4 | 1761 | { |
4be44fcd | 1762 | acpi_status status = 0; |
b6835052 | 1763 | static int first_run; |
4be44fcd | 1764 | struct proc_dir_entry *entry = NULL; |
1da177e4 LT |
1765 | unsigned int i; |
1766 | ||
1da177e4 LT |
1767 | |
1768 | if (!first_run) { | |
1769 | dmi_check_system(processor_power_dmi_table); | |
c1c30634 | 1770 | max_cstate = acpi_processor_cstate_check(max_cstate); |
1da177e4 | 1771 | if (max_cstate < ACPI_C_STATES_MAX) |
4be44fcd LB |
1772 | printk(KERN_NOTICE |
1773 | "ACPI: processor limited to max C-state %d\n", | |
1774 | max_cstate); | |
1da177e4 | 1775 | first_run++; |
f011e2e2 MG |
1776 | #if !defined(CONFIG_CPU_IDLE) && defined(CONFIG_SMP) |
1777 | pm_qos_add_notifier(PM_QOS_CPU_DMA_LATENCY, | |
1778 | &acpi_processor_latency_notifier); | |
1fec74a9 | 1779 | #endif |
1da177e4 LT |
1780 | } |
1781 | ||
02df8b93 | 1782 | if (!pr) |
d550d98d | 1783 | return -EINVAL; |
02df8b93 | 1784 | |
cee324b1 | 1785 | if (acpi_gbl_FADT.cst_control && !nocst) { |
4be44fcd | 1786 | status = |
cee324b1 | 1787 | acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8); |
1da177e4 | 1788 | if (ACPI_FAILURE(status)) { |
a6fc6720 TR |
1789 | ACPI_EXCEPTION((AE_INFO, status, |
1790 | "Notifying BIOS of _CST ability failed")); | |
1da177e4 LT |
1791 | } |
1792 | } | |
1793 | ||
1794 | acpi_processor_get_power_info(pr); | |
4f86d3a8 | 1795 | pr->flags.power_setup_done = 1; |
1da177e4 LT |
1796 | |
1797 | /* | |
1798 | * Install the idle handler if processor power management is supported. | |
1799 | * Note that we use previously set idle handler will be used on | |
1800 | * platforms that only support C1. | |
1801 | */ | |
1802 | if ((pr->flags.power) && (!boot_option_idle_override)) { | |
4f86d3a8 LB |
1803 | #ifdef CONFIG_CPU_IDLE |
1804 | acpi_processor_setup_cpuidle(pr); | |
1805 | pr->power.dev.cpu = pr->id; | |
1806 | if (cpuidle_register_device(&pr->power.dev)) | |
1807 | return -EIO; | |
1808 | #endif | |
1809 | ||
1da177e4 LT |
1810 | printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); |
1811 | for (i = 1; i <= pr->power.count; i++) | |
1812 | if (pr->power.states[i].valid) | |
4be44fcd LB |
1813 | printk(" C%d[C%d]", i, |
1814 | pr->power.states[i].type); | |
1da177e4 LT |
1815 | printk(")\n"); |
1816 | ||
4f86d3a8 | 1817 | #ifndef CONFIG_CPU_IDLE |
1da177e4 LT |
1818 | if (pr->id == 0) { |
1819 | pm_idle_save = pm_idle; | |
1820 | pm_idle = acpi_processor_idle; | |
1821 | } | |
4f86d3a8 | 1822 | #endif |
1da177e4 LT |
1823 | } |
1824 | ||
1825 | /* 'power' [R] */ | |
1826 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, | |
4be44fcd | 1827 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 | 1828 | if (!entry) |
a6fc6720 | 1829 | return -EIO; |
1da177e4 LT |
1830 | else { |
1831 | entry->proc_fops = &acpi_processor_power_fops; | |
1832 | entry->data = acpi_driver_data(device); | |
1833 | entry->owner = THIS_MODULE; | |
1834 | } | |
1835 | ||
d550d98d | 1836 | return 0; |
1da177e4 LT |
1837 | } |
1838 | ||
4be44fcd LB |
1839 | int acpi_processor_power_exit(struct acpi_processor *pr, |
1840 | struct acpi_device *device) | |
1da177e4 | 1841 | { |
4f86d3a8 LB |
1842 | #ifdef CONFIG_CPU_IDLE |
1843 | if ((pr->flags.power) && (!boot_option_idle_override)) | |
1844 | cpuidle_unregister_device(&pr->power.dev); | |
1845 | #endif | |
1da177e4 LT |
1846 | pr->flags.power_setup_done = 0; |
1847 | ||
1848 | if (acpi_device_dir(device)) | |
4be44fcd LB |
1849 | remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
1850 | acpi_device_dir(device)); | |
1da177e4 | 1851 | |
4f86d3a8 LB |
1852 | #ifndef CONFIG_CPU_IDLE |
1853 | ||
1da177e4 LT |
1854 | /* Unregister the idle handler when processor #0 is removed. */ |
1855 | if (pr->id == 0) { | |
1856 | pm_idle = pm_idle_save; | |
1857 | ||
1858 | /* | |
1859 | * We are about to unload the current idle thread pm callback | |
1860 | * (pm_idle), Wait for all processors to update cached/local | |
1861 | * copies of pm_idle before proceeding. | |
1862 | */ | |
1863 | cpu_idle_wait(); | |
1fec74a9 | 1864 | #ifdef CONFIG_SMP |
f011e2e2 MG |
1865 | pm_qos_remove_notifier(PM_QOS_CPU_DMA_LATENCY, |
1866 | &acpi_processor_latency_notifier); | |
1fec74a9 | 1867 | #endif |
1da177e4 | 1868 | } |
4f86d3a8 | 1869 | #endif |
1da177e4 | 1870 | |
d550d98d | 1871 | return 0; |
1da177e4 | 1872 | } |