blob: 0721a8183c89bef438ab3e64b6f5fa3af9fdb054 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Dominik Brodowskic5ab81c2006-06-24 19:37:00 -04006 * Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8 * - Added processor hotplug support
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04009 * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
10 * - Added support for C3 on SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
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>
Tim Schmielau4e57b682005-10-30 15:03:48 -080040#include <linux/sched.h> /* need_resched() */
Arjan van de Ven5c875792006-09-30 23:27:17 -070041#include <linux/latency.h>
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -080042#include <linux/clockchips.h>
Len Brown4f86d3a2007-10-03 18:58:00 -040043#include <linux/cpuidle.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Thomas Gleixner34349332007-02-16 01:27:54 -080045/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#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"
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#define _COMPONENT ACPI_PROCESSOR_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050064ACPI_MODULE_NAME("processor_idle");
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#define ACPI_PROCESSOR_FILE_POWER "power"
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000)
Ingo Molnar2aa44d02007-08-23 15:18:02 +020067#define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY)
Len Brown4f86d3a2007-10-03 18:58:00 -040068#ifndef CONFIG_CPU_IDLE
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */
70#define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */
Andreas Mohrb6835052006-04-27 05:25:00 -040071static void (*pm_idle_save) (void) __read_mostly;
Len Brown4f86d3a2007-10-03 18:58:00 -040072#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))
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Len Brown4f86d3a2007-10-03 18:58:00 -040078static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
Venki Pallipadi5b3f0e62008-01-07 17:50:10 -050079#ifdef CONFIG_CPU_IDLE
Len Brown4f86d3a2007-10-03 18:58:00 -040080module_param(max_cstate, uint, 0000);
Venki Pallipadi5b3f0e62008-01-07 17:50:10 -050081#else
82module_param(max_cstate, uint, 0644);
83#endif
Andreas Mohrb6835052006-04-27 05:25:00 -040084static unsigned int nocst __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085module_param(nocst, uint, 0000);
86
Len Brown4f86d3a2007-10-03 18:58:00 -040087#ifndef CONFIG_CPU_IDLE
Linus Torvalds1da177e2005-04-16 15:20:36 -070088/*
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 */
Andreas Mohrb6835052006-04-27 05:25:00 -040095static unsigned int bm_history __read_mostly =
Len Brown4be44fc2005-08-05 00:44:28 -040096 (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -070097module_param(bm_history, uint, 0644);
Len Brown4f86d3a2007-10-03 18:58:00 -040098
99static int acpi_processor_set_power_policy(struct acpi_processor *pr);
100
101#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103/*
104 * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
105 * For now disable this. Probably a bug somewhere else.
106 *
107 * To skip this limit, boot/load with a large max_cstate limit.
108 */
Jeff Garzik18552562007-10-03 15:15:40 -0400109static int set_max_cstate(const struct dmi_system_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
111 if (max_cstate > ACPI_PROCESSOR_MAX_POWER)
112 return 0;
113
Len Brown3d356002005-08-03 00:22:52 -0400114 printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate."
Len Brown4be44fc2005-08-05 00:44:28 -0400115 " Override with \"processor.max_cstate=%d\"\n", id->ident,
116 (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Len Brown3d356002005-08-03 00:22:52 -0400118 max_cstate = (long)id->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 return 0;
121}
122
Ashok Raj7ded5682006-02-03 21:51:23 +0100123/* Actually this shouldn't be __cpuinitdata, would be better to fix the
124 callers to only run once -AK */
125static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = {
Thomas Rosner876c1842006-01-06 01:31:00 -0500126 { set_max_cstate, "IBM ThinkPad R40e", {
127 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
Bartlomiej Swierczf8313352006-05-29 07:16:00 -0400128 DMI_MATCH(DMI_BIOS_VERSION,"1SET70WW")}, (void *)1},
129 { set_max_cstate, "IBM ThinkPad R40e", {
130 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
Thomas Rosner876c1842006-01-06 01:31:00 -0500131 DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1},
132 { set_max_cstate, "IBM ThinkPad R40e", {
133 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
134 DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1},
135 { set_max_cstate, "IBM ThinkPad R40e", {
136 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
137 DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1},
138 { set_max_cstate, "IBM ThinkPad R40e", {
139 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
140 DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1},
141 { set_max_cstate, "IBM ThinkPad R40e", {
142 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
143 DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1},
144 { set_max_cstate, "IBM ThinkPad R40e", {
145 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
146 DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1},
147 { set_max_cstate, "IBM ThinkPad R40e", {
148 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
149 DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1},
150 { set_max_cstate, "IBM ThinkPad R40e", {
151 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
152 DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1},
153 { set_max_cstate, "IBM ThinkPad R40e", {
154 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
155 DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1},
156 { set_max_cstate, "IBM ThinkPad R40e", {
157 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
158 DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1},
159 { set_max_cstate, "IBM ThinkPad R40e", {
160 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
161 DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1},
162 { set_max_cstate, "IBM ThinkPad R40e", {
163 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
164 DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1},
165 { set_max_cstate, "IBM ThinkPad R40e", {
166 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
167 DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1},
168 { set_max_cstate, "IBM ThinkPad R40e", {
169 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
170 DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1},
171 { set_max_cstate, "IBM ThinkPad R40e", {
172 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
173 DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1},
174 { set_max_cstate, "Medion 41700", {
175 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
176 DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1},
177 { set_max_cstate, "Clevo 5600D", {
178 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
179 DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")},
Len Brown4be44fc2005-08-05 00:44:28 -0400180 (void *)2},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 {},
182};
183
Len Brown4be44fc2005-08-05 00:44:28 -0400184static inline u32 ticks_elapsed(u32 t1, u32 t2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185{
186 if (t2 >= t1)
187 return (t2 - t1);
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300188 else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF);
190 else
191 return ((0xFFFFFFFF - t1) + t2);
192}
193
Len Brown4f86d3a2007-10-03 18:58:00 -0400194static inline u32 ticks_elapsed_in_us(u32 t1, u32 t2)
195{
196 if (t2 >= t1)
197 return PM_TIMER_TICKS_TO_US(t2 - t1);
198 else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER))
199 return PM_TIMER_TICKS_TO_US(((0x00FFFFFF - t1) + t2) & 0x00FFFFFF);
200 else
201 return PM_TIMER_TICKS_TO_US((0xFFFFFFFF - t1) + t2);
202}
203
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500204static void acpi_safe_halt(void)
205{
206 current_thread_info()->status &= ~TS_POLLING;
207 /*
208 * TS_POLLING-cleared state must be visible before we
209 * test NEED_RESCHED:
210 */
211 smp_mb();
212 if (!need_resched())
213 safe_halt();
214 current_thread_info()->status |= TS_POLLING;
215}
216
Len Brown4f86d3a2007-10-03 18:58:00 -0400217#ifndef CONFIG_CPU_IDLE
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219static void
Len Brown4be44fc2005-08-05 00:44:28 -0400220acpi_processor_power_activate(struct acpi_processor *pr,
221 struct acpi_processor_cx *new)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
Len Brown4be44fc2005-08-05 00:44:28 -0400223 struct acpi_processor_cx *old;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225 if (!pr || !new)
226 return;
227
228 old = pr->power.state;
229
230 if (old)
231 old->promotion.count = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400232 new->demotion.count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234 /* Cleanup from old state. */
235 if (old) {
236 switch (old->type) {
237 case ACPI_STATE_C3:
238 /* Disable bus master reload */
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400239 if (new->type != ACPI_STATE_C3 && pr->flags.bm_check)
Bob Moored8c71b62007-02-02 19:48:21 +0300240 acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 break;
242 }
243 }
244
245 /* Prepare to use new state. */
246 switch (new->type) {
247 case ACPI_STATE_C3:
248 /* Enable bus master reload */
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400249 if (old->type != ACPI_STATE_C3 && pr->flags.bm_check)
Bob Moored8c71b62007-02-02 19:48:21 +0300250 acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 break;
252 }
253
254 pr->power.state = new;
255
256 return;
257}
258
Len Brown4be44fc2005-08-05 00:44:28 -0400259static atomic_t c3_cpu_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700261/* Common C-state entry for C2, C3, .. */
262static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
263{
264 if (cstate->space_id == ACPI_CSTATE_FFH) {
265 /* Call into architectural FFH based C-state */
266 acpi_processor_ffh_cstate_enter(cstate);
267 } else {
268 int unused;
269 /* IO port based C-state */
270 inb(cstate->address);
271 /* Dummy wait op - must do something useless after P_LVL2 read
272 because chipsets cannot guarantee that STPCLK# signal
273 gets asserted in time to freeze execution properly. */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300274 unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700275 }
276}
Len Brown4f86d3a2007-10-03 18:58:00 -0400277#endif /* !CONFIG_CPU_IDLE */
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700278
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800279#ifdef ARCH_APICTIMER_STOPS_ON_C3
280
281/*
282 * Some BIOS implementations switch to C3 in the published C2 state.
Linus Torvalds296d93c2007-03-23 08:03:47 -0700283 * This seems to be a common problem on AMD boxen, but other vendors
284 * are affected too. We pick the most conservative approach: we assume
285 * that the local APIC stops in both C2 and C3.
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800286 */
287static void acpi_timer_check_state(int state, struct acpi_processor *pr,
288 struct acpi_processor_cx *cx)
289{
290 struct acpi_processor_power *pwr = &pr->power;
Thomas Gleixnere585bef2007-03-23 16:08:01 +0100291 u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2;
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800292
293 /*
294 * Check, if one of the previous states already marked the lapic
295 * unstable
296 */
297 if (pwr->timer_broadcast_on_state < state)
298 return;
299
Thomas Gleixnere585bef2007-03-23 16:08:01 +0100300 if (cx->type >= type)
Linus Torvalds296d93c2007-03-23 08:03:47 -0700301 pr->power.timer_broadcast_on_state = state;
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800302}
303
304static void acpi_propagate_timer_broadcast(struct acpi_processor *pr)
305{
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800306 unsigned long reason;
307
308 reason = pr->power.timer_broadcast_on_state < INT_MAX ?
309 CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF;
310
311 clockevents_notify(reason, &pr->id);
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800312}
313
314/* Power(C) State timer broadcast control */
315static void acpi_state_timer_broadcast(struct acpi_processor *pr,
316 struct acpi_processor_cx *cx,
317 int broadcast)
318{
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800319 int state = cx - pr->power.states;
320
321 if (state >= pr->power.timer_broadcast_on_state) {
322 unsigned long reason;
323
324 reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER :
325 CLOCK_EVT_NOTIFY_BROADCAST_EXIT;
326 clockevents_notify(reason, &pr->id);
327 }
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800328}
329
330#else
331
332static void acpi_timer_check_state(int state, struct acpi_processor *pr,
333 struct acpi_processor_cx *cstate) { }
334static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) { }
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800335static void acpi_state_timer_broadcast(struct acpi_processor *pr,
336 struct acpi_processor_cx *cx,
337 int broadcast)
338{
339}
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800340
341#endif
342
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000343/*
344 * Suspend / resume control
345 */
346static int acpi_idle_suspend;
347
348int acpi_processor_suspend(struct acpi_device * device, pm_message_t state)
349{
350 acpi_idle_suspend = 1;
351 return 0;
352}
353
354int acpi_processor_resume(struct acpi_device * device)
355{
356 acpi_idle_suspend = 0;
357 return 0;
358}
359
Len Brown4f86d3a2007-10-03 18:58:00 -0400360#ifndef CONFIG_CPU_IDLE
Len Brown4be44fc2005-08-05 00:44:28 -0400361static void acpi_processor_idle(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362{
Len Brown4be44fc2005-08-05 00:44:28 -0400363 struct acpi_processor *pr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 struct acpi_processor_cx *cx = NULL;
365 struct acpi_processor_cx *next_state = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400366 int sleep_ticks = 0;
367 u32 t1, t2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 /*
370 * Interrupts must be disabled during bus mastering calculations and
371 * for C2/C3 transitions.
372 */
373 local_irq_disable();
374
Venkatesh Pallipadid5a3d322007-06-15 19:36:00 -0400375 pr = processors[smp_processor_id()];
376 if (!pr) {
377 local_irq_enable();
378 return;
379 }
380
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 /*
382 * Check whether we truly need to go idle, or should
383 * reschedule:
384 */
385 if (unlikely(need_resched())) {
386 local_irq_enable();
387 return;
388 }
389
390 cx = pr->power.state;
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000391 if (!cx || acpi_idle_suspend) {
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800392 if (pm_idle_save)
393 pm_idle_save();
394 else
395 acpi_safe_halt();
396 return;
397 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399 /*
400 * Check BM Activity
401 * -----------------
402 * Check for bus mastering activity (if required), record, and check
403 * for demotion.
404 */
405 if (pr->flags.bm_check) {
Len Brown4be44fc2005-08-05 00:44:28 -0400406 u32 bm_status = 0;
407 unsigned long diff = jiffies - pr->power.bm_check_timestamp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
Dominik Brodowskic5ab81c2006-06-24 19:37:00 -0400409 if (diff > 31)
410 diff = 31;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Dominik Brodowskic5ab81c2006-06-24 19:37:00 -0400412 pr->power.bm_activity <<= diff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Bob Moored8c71b62007-02-02 19:48:21 +0300414 acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 if (bm_status) {
Dominik Brodowskic5ab81c2006-06-24 19:37:00 -0400416 pr->power.bm_activity |= 0x1;
Bob Moored8c71b62007-02-02 19:48:21 +0300417 acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 }
419 /*
420 * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
421 * the true state of bus mastering activity; forcing us to
422 * manually check the BMIDEA bit of each IDE channel.
423 */
424 else if (errata.piix4.bmisx) {
425 if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
Len Brown4be44fc2005-08-05 00:44:28 -0400426 || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
Dominik Brodowskic5ab81c2006-06-24 19:37:00 -0400427 pr->power.bm_activity |= 0x1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 }
429
430 pr->power.bm_check_timestamp = jiffies;
431
432 /*
Dominik Brodowskic4a001b2006-06-24 19:37:00 -0400433 * If bus mastering is or was active this jiffy, demote
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 * to avoid a faulty transition. Note that the processor
435 * won't enter a low-power state during this call (to this
Dominik Brodowskic4a001b2006-06-24 19:37:00 -0400436 * function) but should upon the next.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 *
438 * TBD: A better policy might be to fallback to the demotion
439 * state (use it for this quantum only) istead of
440 * demoting -- and rely on duration as our sole demotion
441 * qualification. This may, however, introduce DMA
442 * issues (e.g. floppy DMA transfer overrun/underrun).
443 */
Dominik Brodowskic4a001b2006-06-24 19:37:00 -0400444 if ((pr->power.bm_activity & 0x1) &&
445 cx->demotion.threshold.bm) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 local_irq_enable();
447 next_state = cx->demotion.state;
448 goto end;
449 }
450 }
451
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400452#ifdef CONFIG_HOTPLUG_CPU
453 /*
454 * Check for P_LVL2_UP flag before entering C2 and above on
455 * an SMP system. We do it here instead of doing it at _CST/P_LVL
456 * detection phase, to work cleanly with logical CPU hotplug.
457 */
Len Brown4f86d3a2007-10-03 18:58:00 -0400458 if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300459 !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
David Shaohua Li1e483962005-12-01 17:00:00 -0500460 cx = &pr->power.states[ACPI_STATE_C1];
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400461#endif
David Shaohua Li1e483962005-12-01 17:00:00 -0500462
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 /*
464 * Sleep:
465 * ------
466 * Invoke the current Cx state to put the processor to sleep.
467 */
Nick Piggin2a298a32005-12-02 12:44:19 +1100468 if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) {
Andi Kleen495ab9c2006-06-26 13:59:11 +0200469 current_thread_info()->status &= ~TS_POLLING;
Ingo Molnar0888f06a2006-12-22 01:11:56 -0800470 /*
471 * TS_POLLING-cleared state must be visible before we
472 * test NEED_RESCHED:
473 */
474 smp_mb();
Nick Piggin2a298a32005-12-02 12:44:19 +1100475 if (need_resched()) {
Andi Kleen495ab9c2006-06-26 13:59:11 +0200476 current_thread_info()->status |= TS_POLLING;
Linus Torvaldsaf2eb172005-12-02 23:09:06 -0800477 local_irq_enable();
Nick Piggin2a298a32005-12-02 12:44:19 +1100478 return;
479 }
480 }
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 switch (cx->type) {
483
484 case ACPI_STATE_C1:
485 /*
486 * Invoke C1.
487 * Use the appropriate idle routine, the one that would
488 * be used without acpi C-states.
489 */
490 if (pm_idle_save)
491 pm_idle_save();
492 else
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800493 acpi_safe_halt();
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 /*
Len Brown4be44fc2005-08-05 00:44:28 -0400496 * TBD: Can't get time duration while in C1, as resumes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 * go to an ISR rather than here. Need to instrument
498 * base interrupt handler.
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200499 *
500 * Note: the TSC better not stop in C1, sched_clock() will
501 * skew otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 */
503 sleep_ticks = 0xFFFFFFFF;
504 break;
505
506 case ACPI_STATE_C2:
507 /* Get start time (ticks) */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300508 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200509 /* Tell the scheduler that we are going deep-idle: */
510 sched_clock_idle_sleep_event();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 /* Invoke C2 */
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800512 acpi_state_timer_broadcast(pr, cx, 1);
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700513 acpi_cstate_enter(cx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 /* Get end time (ticks) */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300515 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
john stultz539eb112006-06-26 00:25:10 -0700516
Tony Luck0aa366f2007-07-20 11:22:30 -0700517#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
john stultz539eb112006-06-26 00:25:10 -0700518 /* TSC halts in C2, so notify users */
john stultz5a90cf22007-05-02 19:27:08 +0200519 mark_tsc_unstable("possible TSC halt in C2");
john stultz539eb112006-06-26 00:25:10 -0700520#endif
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200521 /* Compute time (ticks) that we were actually asleep */
522 sleep_ticks = ticks_elapsed(t1, t2);
523
524 /* Tell the scheduler how much we idled: */
525 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 /* Re-enable interrupts */
528 local_irq_enable();
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200529 /* Do not account our idle-switching overhead: */
530 sleep_ticks -= cx->latency_ticks + C2_OVERHEAD;
531
Andi Kleen495ab9c2006-06-26 13:59:11 +0200532 current_thread_info()->status |= TS_POLLING;
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800533 acpi_state_timer_broadcast(pr, cx, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 break;
535
536 case ACPI_STATE_C3:
Venki Pallipadibde6f5f2008-01-30 13:32:01 +0100537 acpi_unlazy_tlb(smp_processor_id());
Venkatesh Pallipadi18eab852007-06-15 19:37:00 -0400538 /*
Thomas Gleixnere17bcb42007-12-07 19:16:17 +0100539 * Must be done before busmaster disable as we might
540 * need to access HPET !
541 */
542 acpi_state_timer_broadcast(pr, cx, 1);
543 /*
Venkatesh Pallipadi18eab852007-06-15 19:37:00 -0400544 * disable bus master
545 * bm_check implies we need ARB_DIS
546 * !bm_check implies we need cache flush
547 * bm_control implies whether we can do ARB_DIS
548 *
549 * That leaves a case where bm_check is set and bm_control is
550 * not set. In that case we cannot do much, we enter C3
551 * without doing anything.
552 */
553 if (pr->flags.bm_check && pr->flags.bm_control) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400554 if (atomic_inc_return(&c3_cpu_count) ==
Len Brown4be44fc2005-08-05 00:44:28 -0400555 num_online_cpus()) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400556 /*
557 * All CPUs are trying to go to C3
558 * Disable bus master arbitration
559 */
Bob Moored8c71b62007-02-02 19:48:21 +0300560 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1);
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400561 }
Venkatesh Pallipadi18eab852007-06-15 19:37:00 -0400562 } else if (!pr->flags.bm_check) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400563 /* SMP with no shared cache... Invalidate cache */
564 ACPI_FLUSH_CPU_CACHE();
565 }
Len Brown4be44fc2005-08-05 00:44:28 -0400566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 /* Get start time (ticks) */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300568 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 /* Invoke C3 */
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200570 /* Tell the scheduler that we are going deep-idle: */
571 sched_clock_idle_sleep_event();
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700572 acpi_cstate_enter(cx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 /* Get end time (ticks) */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300574 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
Venkatesh Pallipadi18eab852007-06-15 19:37:00 -0400575 if (pr->flags.bm_check && pr->flags.bm_control) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400576 /* Enable bus master arbitration */
577 atomic_dec(&c3_cpu_count);
Bob Moored8c71b62007-02-02 19:48:21 +0300578 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400579 }
580
Tony Luck0aa366f2007-07-20 11:22:30 -0700581#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
john stultz539eb112006-06-26 00:25:10 -0700582 /* TSC halts in C3, so notify users */
john stultz5a90cf22007-05-02 19:27:08 +0200583 mark_tsc_unstable("TSC halts in C3");
john stultz539eb112006-06-26 00:25:10 -0700584#endif
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200585 /* Compute time (ticks) that we were actually asleep */
586 sleep_ticks = ticks_elapsed(t1, t2);
587 /* Tell the scheduler how much we idled: */
588 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 /* Re-enable interrupts */
591 local_irq_enable();
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200592 /* Do not account our idle-switching overhead: */
593 sleep_ticks -= cx->latency_ticks + C3_OVERHEAD;
594
Andi Kleen495ab9c2006-06-26 13:59:11 +0200595 current_thread_info()->status |= TS_POLLING;
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800596 acpi_state_timer_broadcast(pr, cx, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 break;
598
599 default:
600 local_irq_enable();
601 return;
602 }
Dominik Brodowskia3c65982006-06-24 19:37:00 -0400603 cx->usage++;
604 if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0))
605 cx->time += sleep_ticks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
607 next_state = pr->power.state;
608
David Shaohua Li1e483962005-12-01 17:00:00 -0500609#ifdef CONFIG_HOTPLUG_CPU
610 /* Don't do promotion/demotion */
611 if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) &&
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300612 !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) {
David Shaohua Li1e483962005-12-01 17:00:00 -0500613 next_state = cx;
614 goto end;
615 }
616#endif
617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 /*
619 * Promotion?
620 * ----------
621 * Track the number of longs (time asleep is greater than threshold)
622 * and promote when the count threshold is reached. Note that bus
623 * mastering activity may prevent promotions.
624 * Do not promote above max_cstate.
625 */
626 if (cx->promotion.state &&
627 ((cx->promotion.state - pr->power.states) <= max_cstate)) {
Arjan van de Ven5c875792006-09-30 23:27:17 -0700628 if (sleep_ticks > cx->promotion.threshold.ticks &&
629 cx->promotion.state->latency <= system_latency_constraint()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 cx->promotion.count++;
Len Brown4be44fc2005-08-05 00:44:28 -0400631 cx->demotion.count = 0;
632 if (cx->promotion.count >=
633 cx->promotion.threshold.count) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 if (pr->flags.bm_check) {
Len Brown4be44fc2005-08-05 00:44:28 -0400635 if (!
636 (pr->power.bm_activity & cx->
637 promotion.threshold.bm)) {
638 next_state =
639 cx->promotion.state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 goto end;
641 }
Len Brown4be44fc2005-08-05 00:44:28 -0400642 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 next_state = cx->promotion.state;
644 goto end;
645 }
646 }
647 }
648 }
649
650 /*
651 * Demotion?
652 * ---------
653 * Track the number of shorts (time asleep is less than time threshold)
654 * and demote when the usage threshold is reached.
655 */
656 if (cx->demotion.state) {
657 if (sleep_ticks < cx->demotion.threshold.ticks) {
658 cx->demotion.count++;
659 cx->promotion.count = 0;
660 if (cx->demotion.count >= cx->demotion.threshold.count) {
661 next_state = cx->demotion.state;
662 goto end;
663 }
664 }
665 }
666
Len Brown4be44fc2005-08-05 00:44:28 -0400667 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 /*
669 * Demote if current state exceeds max_cstate
Arjan van de Ven5c875792006-09-30 23:27:17 -0700670 * or if the latency of the current state is unacceptable
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 */
Arjan van de Ven5c875792006-09-30 23:27:17 -0700672 if ((pr->power.state - pr->power.states) > max_cstate ||
673 pr->power.state->latency > system_latency_constraint()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 if (cx->demotion.state)
675 next_state = cx->demotion.state;
676 }
677
678 /*
679 * New Cx State?
680 * -------------
681 * If we're going to start using a new Cx state we must clean up
682 * from the previous and prepare to use the new.
683 */
684 if (next_state != pr->power.state)
685 acpi_processor_power_activate(pr, next_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686}
687
Len Brown4be44fc2005-08-05 00:44:28 -0400688static int acpi_processor_set_power_policy(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689{
690 unsigned int i;
691 unsigned int state_is_set = 0;
692 struct acpi_processor_cx *lower = NULL;
693 struct acpi_processor_cx *higher = NULL;
694 struct acpi_processor_cx *cx;
695
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
697 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400698 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700 /*
701 * This function sets the default Cx state policy (OS idle handler).
702 * Our scheme is to promote quickly to C2 but more conservatively
703 * to C3. We're favoring C2 for its characteristics of low latency
704 * (quick response), good power savings, and ability to allow bus
705 * mastering activity. Note that the Cx state policy is completely
706 * customizable and can be altered dynamically.
707 */
708
709 /* startup state */
Len Brown4be44fc2005-08-05 00:44:28 -0400710 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 cx = &pr->power.states[i];
712 if (!cx->valid)
713 continue;
714
715 if (!state_is_set)
716 pr->power.state = cx;
717 state_is_set++;
718 break;
Len Brown4be44fc2005-08-05 00:44:28 -0400719 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
721 if (!state_is_set)
Patrick Mocheld550d982006-06-27 00:41:40 -0400722 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724 /* demotion */
Len Brown4be44fc2005-08-05 00:44:28 -0400725 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 cx = &pr->power.states[i];
727 if (!cx->valid)
728 continue;
729
730 if (lower) {
731 cx->demotion.state = lower;
732 cx->demotion.threshold.ticks = cx->latency_ticks;
733 cx->demotion.threshold.count = 1;
734 if (cx->type == ACPI_STATE_C3)
735 cx->demotion.threshold.bm = bm_history;
736 }
737
738 lower = cx;
739 }
740
741 /* promotion */
742 for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) {
743 cx = &pr->power.states[i];
744 if (!cx->valid)
745 continue;
746
747 if (higher) {
Len Brown4be44fc2005-08-05 00:44:28 -0400748 cx->promotion.state = higher;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 cx->promotion.threshold.ticks = cx->latency_ticks;
750 if (cx->type >= ACPI_STATE_C2)
751 cx->promotion.threshold.count = 4;
752 else
753 cx->promotion.threshold.count = 10;
754 if (higher->type == ACPI_STATE_C3)
755 cx->promotion.threshold.bm = bm_history;
756 }
757
758 higher = cx;
759 }
760
Patrick Mocheld550d982006-06-27 00:41:40 -0400761 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762}
Len Brown4f86d3a2007-10-03 18:58:00 -0400763#endif /* !CONFIG_CPU_IDLE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
Len Brown4be44fc2005-08-05 00:44:28 -0400765static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
768 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400769 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
771 if (!pr->pblk)
Patrick Mocheld550d982006-06-27 00:41:40 -0400772 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 /* if info is obtained from pblk/fadt, type equals state */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
776 pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
777
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400778#ifndef CONFIG_HOTPLUG_CPU
779 /*
780 * Check for P_LVL2_UP flag before entering C2 and above on
Len Brown4f86d3a2007-10-03 18:58:00 -0400781 * an SMP system.
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400782 */
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300783 if ((num_online_cpus() > 1) &&
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300784 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
Patrick Mocheld550d982006-06-27 00:41:40 -0400785 return -ENODEV;
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400786#endif
787
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 /* determine C2 and C3 address from pblk */
789 pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
790 pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5;
791
792 /* determine latencies from FADT */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300793 pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency;
794 pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
796 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
797 "lvl2[0x%08x] lvl3[0x%08x]\n",
798 pr->power.states[ACPI_STATE_C2].address,
799 pr->power.states[ACPI_STATE_C3].address));
800
Patrick Mocheld550d982006-06-27 00:41:40 -0400801 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802}
803
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700804static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500805{
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700806 if (!pr->power.states[ACPI_STATE_C1].valid) {
807 /* set the first C-State to C1 */
808 /* all processors need to support C1 */
809 pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
810 pr->power.states[ACPI_STATE_C1].valid = 1;
811 }
812 /* the C0 state only exists as a filler in our array */
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500813 pr->power.states[ACPI_STATE_C0].valid = 1;
Patrick Mocheld550d982006-06-27 00:41:40 -0400814 return 0;
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500815}
816
Len Brown4be44fc2005-08-05 00:44:28 -0400817static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818{
Len Brown4be44fc2005-08-05 00:44:28 -0400819 acpi_status status = 0;
820 acpi_integer count;
Janosch Machowinskicf824782005-08-20 08:02:00 -0400821 int current_count;
Len Brown4be44fc2005-08-05 00:44:28 -0400822 int i;
823 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
824 union acpi_object *cst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 if (nocst)
Patrick Mocheld550d982006-06-27 00:41:40 -0400828 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700830 current_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832 status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer);
833 if (ACPI_FAILURE(status)) {
834 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400835 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400836 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200838 cst = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
840 /* There must be at least 2 elements */
841 if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) {
Len Brown64684632006-06-26 23:41:38 -0400842 printk(KERN_ERR PREFIX "not enough elements in _CST\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 status = -EFAULT;
844 goto end;
845 }
846
847 count = cst->package.elements[0].integer.value;
848
849 /* Validate number of power states. */
850 if (count < 1 || count != cst->package.count - 1) {
Len Brown64684632006-06-26 23:41:38 -0400851 printk(KERN_ERR PREFIX "count given by _CST is not valid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 status = -EFAULT;
853 goto end;
854 }
855
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 /* Tell driver that at least _CST is supported. */
857 pr->flags.has_cst = 1;
858
859 for (i = 1; i <= count; i++) {
860 union acpi_object *element;
861 union acpi_object *obj;
862 struct acpi_power_register *reg;
863 struct acpi_processor_cx cx;
864
865 memset(&cx, 0, sizeof(cx));
866
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200867 element = &(cst->package.elements[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 if (element->type != ACPI_TYPE_PACKAGE)
869 continue;
870
871 if (element->package.count != 4)
872 continue;
873
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200874 obj = &(element->package.elements[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
876 if (obj->type != ACPI_TYPE_BUFFER)
877 continue;
878
Len Brown4be44fc2005-08-05 00:44:28 -0400879 reg = (struct acpi_power_register *)obj->buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
881 if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO &&
Len Brown4be44fc2005-08-05 00:44:28 -0400882 (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 continue;
884
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 /* There should be an easy way to extract an integer... */
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200886 obj = &(element->package.elements[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 if (obj->type != ACPI_TYPE_INTEGER)
888 continue;
889
890 cx.type = obj->integer.value;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700891 /*
892 * Some buggy BIOSes won't list C1 in _CST -
893 * Let acpi_processor_get_power_info_default() handle them later
894 */
895 if (i == 1 && cx.type != ACPI_STATE_C1)
896 current_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700898 cx.address = reg->address;
899 cx.index = current_count + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700901 cx.space_id = ACPI_CSTATE_SYSTEMIO;
902 if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
903 if (acpi_processor_ffh_cstate_probe
904 (pr->id, &cx, reg) == 0) {
905 cx.space_id = ACPI_CSTATE_FFH;
906 } else if (cx.type != ACPI_STATE_C1) {
907 /*
908 * C1 is a special case where FIXED_HARDWARE
909 * can be handled in non-MWAIT way as well.
910 * In that case, save this _CST entry info.
911 * That is, we retain space_id of SYSTEM_IO for
912 * halt based C1.
913 * Otherwise, ignore this info and continue.
914 */
915 continue;
916 }
917 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200919 obj = &(element->package.elements[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 if (obj->type != ACPI_TYPE_INTEGER)
921 continue;
922
923 cx.latency = obj->integer.value;
924
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200925 obj = &(element->package.elements[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 if (obj->type != ACPI_TYPE_INTEGER)
927 continue;
928
929 cx.power = obj->integer.value;
930
Janosch Machowinskicf824782005-08-20 08:02:00 -0400931 current_count++;
932 memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx));
933
934 /*
935 * We support total ACPI_PROCESSOR_MAX_POWER - 1
936 * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1)
937 */
938 if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) {
939 printk(KERN_WARNING
940 "Limiting number of power states to max (%d)\n",
941 ACPI_PROCESSOR_MAX_POWER);
942 printk(KERN_WARNING
943 "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n");
944 break;
945 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 }
947
Len Brown4be44fc2005-08-05 00:44:28 -0400948 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n",
Janosch Machowinskicf824782005-08-20 08:02:00 -0400949 current_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951 /* Validate number of power states discovered */
Janosch Machowinskicf824782005-08-20 08:02:00 -0400952 if (current_count < 2)
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -0400953 status = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
Len Brown4be44fc2005-08-05 00:44:28 -0400955 end:
Len Brown02438d82006-06-30 03:19:10 -0400956 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
Patrick Mocheld550d982006-06-27 00:41:40 -0400958 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959}
960
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
962{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963
964 if (!cx->address)
Patrick Mocheld550d982006-06-27 00:41:40 -0400965 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966
967 /*
968 * C2 latency must be less than or equal to 100
969 * microseconds.
970 */
971 else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
972 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400973 "latency too large [%d]\n", cx->latency));
Patrick Mocheld550d982006-06-27 00:41:40 -0400974 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 }
976
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 /*
978 * Otherwise we've met all of our C2 requirements.
979 * Normalize the C2 latency to expidite policy
980 */
981 cx->valid = 1;
Len Brown4f86d3a2007-10-03 18:58:00 -0400982
983#ifndef CONFIG_CPU_IDLE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
Len Brown4f86d3a2007-10-03 18:58:00 -0400985#else
986 cx->latency_ticks = cx->latency;
987#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
Patrick Mocheld550d982006-06-27 00:41:40 -0400989 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990}
991
Len Brown4be44fc2005-08-05 00:44:28 -0400992static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
993 struct acpi_processor_cx *cx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994{
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400995 static int bm_check_flag;
996
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997
998 if (!cx->address)
Patrick Mocheld550d982006-06-27 00:41:40 -0400999 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
1001 /*
1002 * C3 latency must be less than or equal to 1000
1003 * microseconds.
1004 */
1005 else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
1006 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001007 "latency too large [%d]\n", cx->latency));
Patrick Mocheld550d982006-06-27 00:41:40 -04001008 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 }
1010
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 /*
1012 * PIIX4 Erratum #18: We don't support C3 when Type-F (fast)
1013 * DMA transfers are used by any ISA device to avoid livelock.
1014 * Note that we could disable Type-F DMA (as recommended by
1015 * the erratum), but this is known to disrupt certain ISA
1016 * devices thus we take the conservative approach.
1017 */
1018 else if (errata.piix4.fdma) {
1019 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001020 "C3 not supported on PIIX4 with Type-F DMA\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -04001021 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 }
1023
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001024 /* All the logic here assumes flags.bm_check is same across all CPUs */
1025 if (!bm_check_flag) {
1026 /* Determine whether bm_check is needed based on CPU */
1027 acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
1028 bm_check_flag = pr->flags.bm_check;
1029 } else {
1030 pr->flags.bm_check = bm_check_flag;
1031 }
1032
1033 if (pr->flags.bm_check) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001034 if (!pr->flags.bm_control) {
Venki Pallipadied3110e2007-07-31 12:04:31 -07001035 if (pr->flags.has_cst != 1) {
1036 /* bus mastering control is necessary */
1037 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1038 "C3 support requires BM control\n"));
1039 return;
1040 } else {
1041 /* Here we enter C3 without bus mastering */
1042 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1043 "C3 support without BM control\n"));
1044 }
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001045 }
1046 } else {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001047 /*
1048 * WBINVD should be set in fadt, for C3 state to be
1049 * supported on when bm_check is not required.
1050 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001051 if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001052 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001053 "Cache invalidation should work properly"
1054 " for C3 to be enabled on SMP systems\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -04001055 return;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001056 }
Bob Moored8c71b62007-02-02 19:48:21 +03001057 acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001058 }
1059
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 /*
1061 * Otherwise we've met all of our C3 requirements.
1062 * Normalize the C3 latency to expidite policy. Enable
1063 * checking of bus mastering status (bm_check) so we can
1064 * use this in our C3 policy
1065 */
1066 cx->valid = 1;
Len Brown4f86d3a2007-10-03 18:58:00 -04001067
1068#ifndef CONFIG_CPU_IDLE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
Len Brown4f86d3a2007-10-03 18:58:00 -04001070#else
1071 cx->latency_ticks = cx->latency;
1072#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073
Patrick Mocheld550d982006-06-27 00:41:40 -04001074 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075}
1076
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077static int acpi_processor_power_verify(struct acpi_processor *pr)
1078{
1079 unsigned int i;
1080 unsigned int working = 0;
Venkatesh Pallipadi6eb0a0f2006-01-11 22:44:21 +01001081
Thomas Gleixner169a0ab2007-02-16 01:27:55 -08001082 pr->power.timer_broadcast_on_state = INT_MAX;
Venkatesh Pallipadi6eb0a0f2006-01-11 22:44:21 +01001083
Len Brown4be44fc2005-08-05 00:44:28 -04001084 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 struct acpi_processor_cx *cx = &pr->power.states[i];
1086
1087 switch (cx->type) {
1088 case ACPI_STATE_C1:
1089 cx->valid = 1;
1090 break;
1091
1092 case ACPI_STATE_C2:
1093 acpi_processor_power_verify_c2(cx);
Linus Torvalds296d93c2007-03-23 08:03:47 -07001094 if (cx->valid)
Thomas Gleixner169a0ab2007-02-16 01:27:55 -08001095 acpi_timer_check_state(i, pr, cx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 break;
1097
1098 case ACPI_STATE_C3:
1099 acpi_processor_power_verify_c3(pr, cx);
Linus Torvalds296d93c2007-03-23 08:03:47 -07001100 if (cx->valid)
Thomas Gleixner169a0ab2007-02-16 01:27:55 -08001101 acpi_timer_check_state(i, pr, cx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 break;
1103 }
1104
1105 if (cx->valid)
1106 working++;
1107 }
1108
Thomas Gleixner169a0ab2007-02-16 01:27:55 -08001109 acpi_propagate_timer_broadcast(pr);
Andi Kleenbd663342006-03-25 16:31:07 +01001110
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 return (working);
1112}
1113
Len Brown4be44fc2005-08-05 00:44:28 -04001114static int acpi_processor_get_power_info(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115{
1116 unsigned int i;
1117 int result;
1118
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119
1120 /* NOTE: the idle thread may not be running while calling
1121 * this function */
1122
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -07001123 /* Zero initialize all the C-states info. */
1124 memset(pr->power.states, 0, sizeof(pr->power.states));
1125
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 result = acpi_processor_get_power_info_cst(pr);
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -04001127 if (result == -ENODEV)
Darrick J. Wongc5a114f2006-10-19 23:28:28 -07001128 result = acpi_processor_get_power_info_fadt(pr);
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -04001129
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -07001130 if (result)
1131 return result;
1132
1133 acpi_processor_get_power_info_default(pr);
1134
Janosch Machowinskicf824782005-08-20 08:02:00 -04001135 pr->power.count = acpi_processor_power_verify(pr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136
Len Brown4f86d3a2007-10-03 18:58:00 -04001137#ifndef CONFIG_CPU_IDLE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 /*
1139 * Set Default Policy
1140 * ------------------
1141 * Now that we know which states are supported, set the default
1142 * policy. Note that this policy can be changed dynamically
1143 * (e.g. encourage deeper sleeps to conserve battery life when
1144 * not on AC).
1145 */
1146 result = acpi_processor_set_power_policy(pr);
1147 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -04001148 return result;
Len Brown4f86d3a2007-10-03 18:58:00 -04001149#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150
1151 /*
1152 * if one state of type C2 or C3 is available, mark this
1153 * CPU as being "idle manageable"
1154 */
1155 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -05001156 if (pr->power.states[i].valid) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 pr->power.count = i;
Linus Torvalds2203d6e2005-11-18 07:29:51 -08001158 if (pr->power.states[i].type >= ACPI_STATE_C2)
1159 pr->flags.power = 1;
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -05001160 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 }
1162
Patrick Mocheld550d982006-06-27 00:41:40 -04001163 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164}
1165
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
1167{
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001168 struct acpi_processor *pr = seq->private;
Len Brown4be44fc2005-08-05 00:44:28 -04001169 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171
1172 if (!pr)
1173 goto end;
1174
1175 seq_printf(seq, "active state: C%zd\n"
Len Brown4be44fc2005-08-05 00:44:28 -04001176 "max_cstate: C%d\n"
Arjan van de Ven5c875792006-09-30 23:27:17 -07001177 "bus master activity: %08x\n"
1178 "maximum allowed latency: %d usec\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001179 pr->power.state ? pr->power.state - pr->power.states : 0,
Arjan van de Ven5c875792006-09-30 23:27:17 -07001180 max_cstate, (unsigned)pr->power.bm_activity,
1181 system_latency_constraint());
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182
1183 seq_puts(seq, "states:\n");
1184
1185 for (i = 1; i <= pr->power.count; i++) {
1186 seq_printf(seq, " %cC%d: ",
Len Brown4be44fc2005-08-05 00:44:28 -04001187 (&pr->power.states[i] ==
1188 pr->power.state ? '*' : ' '), i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189
1190 if (!pr->power.states[i].valid) {
1191 seq_puts(seq, "<not supported>\n");
1192 continue;
1193 }
1194
1195 switch (pr->power.states[i].type) {
1196 case ACPI_STATE_C1:
1197 seq_printf(seq, "type[C1] ");
1198 break;
1199 case ACPI_STATE_C2:
1200 seq_printf(seq, "type[C2] ");
1201 break;
1202 case ACPI_STATE_C3:
1203 seq_printf(seq, "type[C3] ");
1204 break;
1205 default:
1206 seq_printf(seq, "type[--] ");
1207 break;
1208 }
1209
1210 if (pr->power.states[i].promotion.state)
1211 seq_printf(seq, "promotion[C%zd] ",
Len Brown4be44fc2005-08-05 00:44:28 -04001212 (pr->power.states[i].promotion.state -
1213 pr->power.states));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 else
1215 seq_puts(seq, "promotion[--] ");
1216
1217 if (pr->power.states[i].demotion.state)
1218 seq_printf(seq, "demotion[C%zd] ",
Len Brown4be44fc2005-08-05 00:44:28 -04001219 (pr->power.states[i].demotion.state -
1220 pr->power.states));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 else
1222 seq_puts(seq, "demotion[--] ");
1223
Dominik Brodowskia3c65982006-06-24 19:37:00 -04001224 seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001225 pr->power.states[i].latency,
Dominik Brodowskia3c65982006-06-24 19:37:00 -04001226 pr->power.states[i].usage,
Alexey Starikovskiyb0b7eaa2007-01-25 22:39:44 -05001227 (unsigned long long)pr->power.states[i].time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 }
1229
Len Brown4be44fc2005-08-05 00:44:28 -04001230 end:
Patrick Mocheld550d982006-06-27 00:41:40 -04001231 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232}
1233
1234static int acpi_processor_power_open_fs(struct inode *inode, struct file *file)
1235{
1236 return single_open(file, acpi_processor_power_seq_show,
Len Brown4be44fc2005-08-05 00:44:28 -04001237 PDE(inode)->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238}
1239
Arjan van de Vend7508032006-07-04 13:06:00 -04001240static const struct file_operations acpi_processor_power_fops = {
Len Brown4be44fc2005-08-05 00:44:28 -04001241 .open = acpi_processor_power_open_fs,
1242 .read = seq_read,
1243 .llseek = seq_lseek,
1244 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245};
1246
Len Brown4f86d3a2007-10-03 18:58:00 -04001247#ifndef CONFIG_CPU_IDLE
1248
1249int acpi_processor_cst_has_changed(struct acpi_processor *pr)
1250{
1251 int result = 0;
1252
1253
1254 if (!pr)
1255 return -EINVAL;
1256
1257 if (nocst) {
1258 return -ENODEV;
1259 }
1260
1261 if (!pr->flags.power_setup_done)
1262 return -ENODEV;
1263
1264 /* Fall back to the default idle loop */
1265 pm_idle = pm_idle_save;
1266 synchronize_sched(); /* Relies on interrupts forcing exit from idle. */
1267
1268 pr->flags.power = 0;
1269 result = acpi_processor_get_power_info(pr);
1270 if ((pr->flags.power == 1) && (pr->flags.power_setup_done))
1271 pm_idle = acpi_processor_idle;
1272
1273 return result;
1274}
1275
Andrew Morton1fec74a2006-10-17 00:09:58 -07001276#ifdef CONFIG_SMP
Arjan van de Ven5c875792006-09-30 23:27:17 -07001277static void smp_callback(void *v)
1278{
1279 /* we already woke the CPU up, nothing more to do */
1280}
1281
1282/*
1283 * This function gets called when a part of the kernel has a new latency
1284 * requirement. This means we need to get all processors out of their C-state,
1285 * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that
1286 * wakes them all right up.
1287 */
1288static int acpi_processor_latency_notify(struct notifier_block *b,
1289 unsigned long l, void *v)
1290{
1291 smp_call_function(smp_callback, NULL, 0, 1);
1292 return NOTIFY_OK;
1293}
1294
1295static struct notifier_block acpi_processor_latency_notifier = {
1296 .notifier_call = acpi_processor_latency_notify,
1297};
Len Brown4f86d3a2007-10-03 18:58:00 -04001298
Andrew Morton1fec74a2006-10-17 00:09:58 -07001299#endif
Arjan van de Ven5c875792006-09-30 23:27:17 -07001300
Len Brown4f86d3a2007-10-03 18:58:00 -04001301#else /* CONFIG_CPU_IDLE */
1302
1303/**
1304 * acpi_idle_bm_check - checks if bus master activity was detected
1305 */
1306static int acpi_idle_bm_check(void)
1307{
1308 u32 bm_status = 0;
1309
1310 acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
1311 if (bm_status)
1312 acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
1313 /*
1314 * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
1315 * the true state of bus mastering activity; forcing us to
1316 * manually check the BMIDEA bit of each IDE channel.
1317 */
1318 else if (errata.piix4.bmisx) {
1319 if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
1320 || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
1321 bm_status = 1;
1322 }
1323 return bm_status;
1324}
1325
1326/**
1327 * acpi_idle_update_bm_rld - updates the BM_RLD bit depending on target state
1328 * @pr: the processor
1329 * @target: the new target state
1330 */
1331static inline void acpi_idle_update_bm_rld(struct acpi_processor *pr,
1332 struct acpi_processor_cx *target)
1333{
1334 if (pr->flags.bm_rld_set && target->type != ACPI_STATE_C3) {
1335 acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
1336 pr->flags.bm_rld_set = 0;
1337 }
1338
1339 if (!pr->flags.bm_rld_set && target->type == ACPI_STATE_C3) {
1340 acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
1341 pr->flags.bm_rld_set = 1;
1342 }
1343}
1344
1345/**
1346 * acpi_idle_do_entry - a helper function that does C2 and C3 type entry
1347 * @cx: cstate data
1348 */
1349static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
1350{
1351 if (cx->space_id == ACPI_CSTATE_FFH) {
1352 /* Call into architectural FFH based C-state */
1353 acpi_processor_ffh_cstate_enter(cx);
1354 } else {
1355 int unused;
1356 /* IO port based C-state */
1357 inb(cx->address);
1358 /* Dummy wait op - must do something useless after P_LVL2 read
1359 because chipsets cannot guarantee that STPCLK# signal
1360 gets asserted in time to freeze execution properly. */
1361 unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
1362 }
1363}
1364
1365/**
1366 * acpi_idle_enter_c1 - enters an ACPI C1 state-type
1367 * @dev: the target CPU
1368 * @state: the state data
1369 *
1370 * This is equivalent to the HALT instruction.
1371 */
1372static int acpi_idle_enter_c1(struct cpuidle_device *dev,
1373 struct cpuidle_state *state)
1374{
1375 struct acpi_processor *pr;
1376 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
1377 pr = processors[smp_processor_id()];
1378
1379 if (unlikely(!pr))
1380 return 0;
1381
1382 if (pr->flags.bm_check)
1383 acpi_idle_update_bm_rld(pr, cx);
1384
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001385 acpi_safe_halt();
Len Brown4f86d3a2007-10-03 18:58:00 -04001386
1387 cx->usage++;
1388
1389 return 0;
1390}
1391
1392/**
1393 * acpi_idle_enter_simple - enters an ACPI state without BM handling
1394 * @dev: the target CPU
1395 * @state: the state data
1396 */
1397static int acpi_idle_enter_simple(struct cpuidle_device *dev,
1398 struct cpuidle_state *state)
1399{
1400 struct acpi_processor *pr;
1401 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
1402 u32 t1, t2;
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001403 int sleep_ticks = 0;
1404
Len Brown4f86d3a2007-10-03 18:58:00 -04001405 pr = processors[smp_processor_id()];
1406
1407 if (unlikely(!pr))
1408 return 0;
1409
Len Browne1964412007-10-04 01:23:47 -04001410 if (acpi_idle_suspend)
1411 return(acpi_idle_enter_c1(dev, state));
1412
Len Brown4f86d3a2007-10-03 18:58:00 -04001413 local_irq_disable();
1414 current_thread_info()->status &= ~TS_POLLING;
1415 /*
1416 * TS_POLLING-cleared state must be visible before we test
1417 * NEED_RESCHED:
1418 */
1419 smp_mb();
1420
1421 if (unlikely(need_resched())) {
1422 current_thread_info()->status |= TS_POLLING;
1423 local_irq_enable();
1424 return 0;
1425 }
1426
Venki Pallipadibde6f5f2008-01-30 13:32:01 +01001427 acpi_unlazy_tlb(smp_processor_id());
Thomas Gleixnere17bcb42007-12-07 19:16:17 +01001428 /*
1429 * Must be done before busmaster disable as we might need to
1430 * access HPET !
1431 */
1432 acpi_state_timer_broadcast(pr, cx, 1);
1433
1434 if (pr->flags.bm_check)
1435 acpi_idle_update_bm_rld(pr, cx);
1436
Len Brown4f86d3a2007-10-03 18:58:00 -04001437 if (cx->type == ACPI_STATE_C3)
1438 ACPI_FLUSH_CPU_CACHE();
1439
1440 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001441 /* Tell the scheduler that we are going deep-idle: */
1442 sched_clock_idle_sleep_event();
Len Brown4f86d3a2007-10-03 18:58:00 -04001443 acpi_idle_do_entry(cx);
1444 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
1445
1446#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
1447 /* TSC could halt in idle, so notify users */
1448 mark_tsc_unstable("TSC halts in idle");;
1449#endif
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001450 sleep_ticks = ticks_elapsed(t1, t2);
1451
1452 /* Tell the scheduler how much we idled: */
1453 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
Len Brown4f86d3a2007-10-03 18:58:00 -04001454
1455 local_irq_enable();
1456 current_thread_info()->status |= TS_POLLING;
1457
1458 cx->usage++;
1459
1460 acpi_state_timer_broadcast(pr, cx, 0);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001461 cx->time += sleep_ticks;
Len Brown4f86d3a2007-10-03 18:58:00 -04001462 return ticks_elapsed_in_us(t1, t2);
1463}
1464
1465static int c3_cpu_count;
1466static DEFINE_SPINLOCK(c3_lock);
1467
1468/**
1469 * acpi_idle_enter_bm - enters C3 with proper BM handling
1470 * @dev: the target CPU
1471 * @state: the state data
1472 *
1473 * If BM is detected, the deepest non-C3 idle state is entered instead.
1474 */
1475static int acpi_idle_enter_bm(struct cpuidle_device *dev,
1476 struct cpuidle_state *state)
1477{
1478 struct acpi_processor *pr;
1479 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
1480 u32 t1, t2;
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001481 int sleep_ticks = 0;
1482
Len Brown4f86d3a2007-10-03 18:58:00 -04001483 pr = processors[smp_processor_id()];
1484
1485 if (unlikely(!pr))
1486 return 0;
1487
Len Browne1964412007-10-04 01:23:47 -04001488 if (acpi_idle_suspend)
1489 return(acpi_idle_enter_c1(dev, state));
1490
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001491 if (acpi_idle_bm_check()) {
1492 if (dev->safe_state) {
1493 return dev->safe_state->enter(dev, dev->safe_state);
1494 } else {
1495 acpi_safe_halt();
1496 return 0;
1497 }
1498 }
1499
Len Brown4f86d3a2007-10-03 18:58:00 -04001500 local_irq_disable();
1501 current_thread_info()->status &= ~TS_POLLING;
1502 /*
1503 * TS_POLLING-cleared state must be visible before we test
1504 * NEED_RESCHED:
1505 */
1506 smp_mb();
1507
1508 if (unlikely(need_resched())) {
1509 current_thread_info()->status |= TS_POLLING;
1510 local_irq_enable();
1511 return 0;
1512 }
1513
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001514 /* Tell the scheduler that we are going deep-idle: */
1515 sched_clock_idle_sleep_event();
Len Brown4f86d3a2007-10-03 18:58:00 -04001516 /*
1517 * Must be done before busmaster disable as we might need to
1518 * access HPET !
1519 */
1520 acpi_state_timer_broadcast(pr, cx, 1);
1521
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001522 acpi_idle_update_bm_rld(pr, cx);
Len Brown4f86d3a2007-10-03 18:58:00 -04001523
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001524 /*
1525 * disable bus master
1526 * bm_check implies we need ARB_DIS
1527 * !bm_check implies we need cache flush
1528 * bm_control implies whether we can do ARB_DIS
1529 *
1530 * That leaves a case where bm_check is set and bm_control is
1531 * not set. In that case we cannot do much, we enter C3
1532 * without doing anything.
1533 */
1534 if (pr->flags.bm_check && pr->flags.bm_control) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001535 spin_lock(&c3_lock);
1536 c3_cpu_count++;
1537 /* Disable bus master arbitration when all CPUs are in C3 */
1538 if (c3_cpu_count == num_online_cpus())
1539 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1);
1540 spin_unlock(&c3_lock);
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001541 } else if (!pr->flags.bm_check) {
1542 ACPI_FLUSH_CPU_CACHE();
1543 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001544
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001545 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
1546 acpi_idle_do_entry(cx);
1547 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
Len Brown4f86d3a2007-10-03 18:58:00 -04001548
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001549 /* Re-enable bus master arbitration */
1550 if (pr->flags.bm_check && pr->flags.bm_control) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001551 spin_lock(&c3_lock);
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001552 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
Len Brown4f86d3a2007-10-03 18:58:00 -04001553 c3_cpu_count--;
1554 spin_unlock(&c3_lock);
1555 }
1556
1557#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
1558 /* TSC could halt in idle, so notify users */
1559 mark_tsc_unstable("TSC halts in idle");
1560#endif
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001561 sleep_ticks = ticks_elapsed(t1, t2);
1562 /* Tell the scheduler how much we idled: */
1563 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
Len Brown4f86d3a2007-10-03 18:58:00 -04001564
1565 local_irq_enable();
1566 current_thread_info()->status |= TS_POLLING;
1567
1568 cx->usage++;
1569
1570 acpi_state_timer_broadcast(pr, cx, 0);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001571 cx->time += sleep_ticks;
Len Brown4f86d3a2007-10-03 18:58:00 -04001572 return ticks_elapsed_in_us(t1, t2);
1573}
1574
1575struct cpuidle_driver acpi_idle_driver = {
1576 .name = "acpi_idle",
1577 .owner = THIS_MODULE,
1578};
1579
1580/**
1581 * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE
1582 * @pr: the ACPI processor
1583 */
1584static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
1585{
1586 int i, count = 0;
1587 struct acpi_processor_cx *cx;
1588 struct cpuidle_state *state;
1589 struct cpuidle_device *dev = &pr->power.dev;
1590
1591 if (!pr->flags.power_setup_done)
1592 return -EINVAL;
1593
1594 if (pr->flags.power == 0) {
1595 return -EINVAL;
1596 }
1597
1598 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
1599 cx = &pr->power.states[i];
1600 state = &dev->states[count];
1601
1602 if (!cx->valid)
1603 continue;
1604
1605#ifdef CONFIG_HOTPLUG_CPU
1606 if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
1607 !pr->flags.has_cst &&
1608 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
1609 continue;
1610#endif
1611 cpuidle_set_statedata(state, cx);
1612
1613 snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
1614 state->exit_latency = cx->latency;
1615 state->target_residency = cx->latency * 6;
1616 state->power_usage = cx->power;
1617
1618 state->flags = 0;
1619 switch (cx->type) {
1620 case ACPI_STATE_C1:
1621 state->flags |= CPUIDLE_FLAG_SHALLOW;
1622 state->enter = acpi_idle_enter_c1;
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001623 dev->safe_state = state;
Len Brown4f86d3a2007-10-03 18:58:00 -04001624 break;
1625
1626 case ACPI_STATE_C2:
1627 state->flags |= CPUIDLE_FLAG_BALANCED;
1628 state->flags |= CPUIDLE_FLAG_TIME_VALID;
1629 state->enter = acpi_idle_enter_simple;
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001630 dev->safe_state = state;
Len Brown4f86d3a2007-10-03 18:58:00 -04001631 break;
1632
1633 case ACPI_STATE_C3:
1634 state->flags |= CPUIDLE_FLAG_DEEP;
1635 state->flags |= CPUIDLE_FLAG_TIME_VALID;
1636 state->flags |= CPUIDLE_FLAG_CHECK_BM;
1637 state->enter = pr->flags.bm_check ?
1638 acpi_idle_enter_bm :
1639 acpi_idle_enter_simple;
1640 break;
1641 }
1642
1643 count++;
1644 }
1645
1646 dev->state_count = count;
1647
1648 if (!count)
1649 return -EINVAL;
1650
Len Brown4f86d3a2007-10-03 18:58:00 -04001651 return 0;
1652}
1653
1654int acpi_processor_cst_has_changed(struct acpi_processor *pr)
1655{
1656 int ret;
1657
1658 if (!pr)
1659 return -EINVAL;
1660
1661 if (nocst) {
1662 return -ENODEV;
1663 }
1664
1665 if (!pr->flags.power_setup_done)
1666 return -ENODEV;
1667
1668 cpuidle_pause_and_lock();
1669 cpuidle_disable_device(&pr->power.dev);
1670 acpi_processor_get_power_info(pr);
1671 acpi_processor_setup_cpuidle(pr);
1672 ret = cpuidle_enable_device(&pr->power.dev);
1673 cpuidle_resume_and_unlock();
1674
1675 return ret;
1676}
1677
1678#endif /* CONFIG_CPU_IDLE */
1679
Pierre Ossman7af8b662006-10-10 14:20:31 -07001680int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
Len Brown4be44fc2005-08-05 00:44:28 -04001681 struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682{
Len Brown4be44fc2005-08-05 00:44:28 -04001683 acpi_status status = 0;
Andreas Mohrb6835052006-04-27 05:25:00 -04001684 static int first_run;
Len Brown4be44fc2005-08-05 00:44:28 -04001685 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686 unsigned int i;
1687
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688
1689 if (!first_run) {
1690 dmi_check_system(processor_power_dmi_table);
Alexey Starikovskiyc1c30632007-11-26 20:42:19 +01001691 max_cstate = acpi_processor_cstate_check(max_cstate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692 if (max_cstate < ACPI_C_STATES_MAX)
Len Brown4be44fc2005-08-05 00:44:28 -04001693 printk(KERN_NOTICE
1694 "ACPI: processor limited to max C-state %d\n",
1695 max_cstate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 first_run++;
Len Brown4f86d3a2007-10-03 18:58:00 -04001697#if !defined (CONFIG_CPU_IDLE) && defined (CONFIG_SMP)
Arjan van de Ven5c875792006-09-30 23:27:17 -07001698 register_latency_notifier(&acpi_processor_latency_notifier);
Andrew Morton1fec74a2006-10-17 00:09:58 -07001699#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 }
1701
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001702 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -04001703 return -EINVAL;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001704
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001705 if (acpi_gbl_FADT.cst_control && !nocst) {
Len Brown4be44fc2005-08-05 00:44:28 -04001706 status =
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001707 acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001709 ACPI_EXCEPTION((AE_INFO, status,
1710 "Notifying BIOS of _CST ability failed"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711 }
1712 }
1713
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714 acpi_processor_get_power_info(pr);
Len Brown4f86d3a2007-10-03 18:58:00 -04001715 pr->flags.power_setup_done = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716
1717 /*
1718 * Install the idle handler if processor power management is supported.
1719 * Note that we use previously set idle handler will be used on
1720 * platforms that only support C1.
1721 */
1722 if ((pr->flags.power) && (!boot_option_idle_override)) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001723#ifdef CONFIG_CPU_IDLE
1724 acpi_processor_setup_cpuidle(pr);
1725 pr->power.dev.cpu = pr->id;
1726 if (cpuidle_register_device(&pr->power.dev))
1727 return -EIO;
1728#endif
1729
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id);
1731 for (i = 1; i <= pr->power.count; i++)
1732 if (pr->power.states[i].valid)
Len Brown4be44fc2005-08-05 00:44:28 -04001733 printk(" C%d[C%d]", i,
1734 pr->power.states[i].type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735 printk(")\n");
1736
Len Brown4f86d3a2007-10-03 18:58:00 -04001737#ifndef CONFIG_CPU_IDLE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738 if (pr->id == 0) {
1739 pm_idle_save = pm_idle;
1740 pm_idle = acpi_processor_idle;
1741 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001742#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743 }
1744
1745 /* 'power' [R] */
1746 entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER,
Len Brown4be44fc2005-08-05 00:44:28 -04001747 S_IRUGO, acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748 if (!entry)
Thomas Renningera6fc6722006-06-26 23:58:43 -04001749 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 else {
1751 entry->proc_fops = &acpi_processor_power_fops;
1752 entry->data = acpi_driver_data(device);
1753 entry->owner = THIS_MODULE;
1754 }
1755
Patrick Mocheld550d982006-06-27 00:41:40 -04001756 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757}
1758
Len Brown4be44fc2005-08-05 00:44:28 -04001759int acpi_processor_power_exit(struct acpi_processor *pr,
1760 struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761{
Len Brown4f86d3a2007-10-03 18:58:00 -04001762#ifdef CONFIG_CPU_IDLE
1763 if ((pr->flags.power) && (!boot_option_idle_override))
1764 cpuidle_unregister_device(&pr->power.dev);
1765#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 pr->flags.power_setup_done = 0;
1767
1768 if (acpi_device_dir(device))
Len Brown4be44fc2005-08-05 00:44:28 -04001769 remove_proc_entry(ACPI_PROCESSOR_FILE_POWER,
1770 acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771
Len Brown4f86d3a2007-10-03 18:58:00 -04001772#ifndef CONFIG_CPU_IDLE
1773
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774 /* Unregister the idle handler when processor #0 is removed. */
1775 if (pr->id == 0) {
1776 pm_idle = pm_idle_save;
1777
1778 /*
1779 * We are about to unload the current idle thread pm callback
1780 * (pm_idle), Wait for all processors to update cached/local
1781 * copies of pm_idle before proceeding.
1782 */
1783 cpu_idle_wait();
Andrew Morton1fec74a2006-10-17 00:09:58 -07001784#ifdef CONFIG_SMP
Arjan van de Ven5c875792006-09-30 23:27:17 -07001785 unregister_latency_notifier(&acpi_processor_latency_notifier);
Andrew Morton1fec74a2006-10-17 00:09:58 -07001786#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001788#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789
Patrick Mocheld550d982006-06-27 00:41:40 -04001790 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791}