blob: 556ee1585192e10c0f35d79630d6d3a934cbcf8d [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() */
Mark Grossf011e2e2008-02-04 22:30:09 -080041#include <linux/pm_qos_params.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
Len Brown4963f622007-12-13 23:50:45 -0500101#else /* CONFIG_CPU_IDLE */
Len Brown25de5712007-12-14 00:24:15 -0500102static unsigned int latency_factor __read_mostly = 2;
Len Brown4963f622007-12-13 23:50:45 -0500103module_param(latency_factor, uint, 0644);
Len Brown4f86d3a2007-10-03 18:58:00 -0400104#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
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 */
Jeff Garzik18552562007-10-03 15:15:40 -0400112static int set_max_cstate(const struct dmi_system_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113{
114 if (max_cstate > ACPI_PROCESSOR_MAX_POWER)
115 return 0;
116
Len Brown3d356002005-08-03 00:22:52 -0400117 printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate."
Len Brown4be44fc2005-08-05 00:44:28 -0400118 " Override with \"processor.max_cstate=%d\"\n", id->ident,
119 (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Len Brown3d356002005-08-03 00:22:52 -0400121 max_cstate = (long)id->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123 return 0;
124}
125
Ashok Raj7ded5682006-02-03 21:51:23 +0100126/* Actually this shouldn't be __cpuinitdata, would be better to fix the
127 callers to only run once -AK */
128static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = {
Thomas Rosner876c1842006-01-06 01:31:00 -0500129 { set_max_cstate, "IBM ThinkPad R40e", {
130 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
Bartlomiej Swierczf8313352006-05-29 07:16:00 -0400131 DMI_MATCH(DMI_BIOS_VERSION,"1SET70WW")}, (void *)1},
132 { set_max_cstate, "IBM ThinkPad R40e", {
133 DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
Thomas Rosner876c1842006-01-06 01:31:00 -0500134 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")},
Len Brown4be44fc2005-08-05 00:44:28 -0400183 (void *)2},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 {},
185};
186
Len Brown4be44fc2005-08-05 00:44:28 -0400187static inline u32 ticks_elapsed(u32 t1, u32 t2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188{
189 if (t2 >= t1)
190 return (t2 - t1);
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300191 else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF);
193 else
194 return ((0xFFFFFFFF - t1) + t2);
195}
196
Len Brown4f86d3a2007-10-03 18:58:00 -0400197static 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
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800207/*
208 * Callers should disable interrupts before the call and enable
209 * interrupts after return.
210 */
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500211static 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();
Venki Pallipadi71e93d12008-03-13 17:18:19 -0700219 if (!need_resched()) {
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500220 safe_halt();
Venki Pallipadi71e93d12008-03-13 17:18:19 -0700221 local_irq_disable();
222 }
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500223 current_thread_info()->status |= TS_POLLING;
224}
225
Len Brown4f86d3a2007-10-03 18:58:00 -0400226#ifndef CONFIG_CPU_IDLE
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228static void
Len Brown4be44fc2005-08-05 00:44:28 -0400229acpi_processor_power_activate(struct acpi_processor *pr,
230 struct acpi_processor_cx *new)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231{
Len Brown4be44fc2005-08-05 00:44:28 -0400232 struct acpi_processor_cx *old;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234 if (!pr || !new)
235 return;
236
237 old = pr->power.state;
238
239 if (old)
240 old->promotion.count = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400241 new->demotion.count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
243 /* Cleanup from old state. */
244 if (old) {
245 switch (old->type) {
246 case ACPI_STATE_C3:
247 /* Disable bus master reload */
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400248 if (new->type != ACPI_STATE_C3 && pr->flags.bm_check)
Bob Moored8c71b62007-02-02 19:48:21 +0300249 acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 break;
251 }
252 }
253
254 /* Prepare to use new state. */
255 switch (new->type) {
256 case ACPI_STATE_C3:
257 /* Enable bus master reload */
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400258 if (old->type != ACPI_STATE_C3 && pr->flags.bm_check)
Bob Moored8c71b62007-02-02 19:48:21 +0300259 acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 break;
261 }
262
263 pr->power.state = new;
264
265 return;
266}
267
Len Brown4be44fc2005-08-05 00:44:28 -0400268static atomic_t c3_cpu_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700270/* Common C-state entry for C2, C3, .. */
271static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
272{
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800273 if (cstate->entry_method == ACPI_CSTATE_FFH) {
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700274 /* 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. */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300283 unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700284 }
285}
Len Brown4f86d3a2007-10-03 18:58:00 -0400286#endif /* !CONFIG_CPU_IDLE */
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700287
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800288#ifdef ARCH_APICTIMER_STOPS_ON_C3
289
290/*
291 * Some BIOS implementations switch to C3 in the published C2 state.
Linus Torvalds296d93c2007-03-23 08:03:47 -0700292 * 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.
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800295 */
296static 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;
Thomas Gleixnere585bef2007-03-23 16:08:01 +0100300 u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2;
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800301
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
Thomas Gleixnere585bef2007-03-23 16:08:01 +0100309 if (cx->type >= type)
Linus Torvalds296d93c2007-03-23 08:03:47 -0700310 pr->power.timer_broadcast_on_state = state;
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800311}
312
313static void acpi_propagate_timer_broadcast(struct acpi_processor *pr)
314{
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800315 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);
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800321}
322
323/* Power(C) State timer broadcast control */
324static void acpi_state_timer_broadcast(struct acpi_processor *pr,
325 struct acpi_processor_cx *cx,
326 int broadcast)
327{
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800328 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 }
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800337}
338
339#else
340
341static void acpi_timer_check_state(int state, struct acpi_processor *pr,
342 struct acpi_processor_cx *cstate) { }
343static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) { }
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800344static void acpi_state_timer_broadcast(struct acpi_processor *pr,
345 struct acpi_processor_cx *cx,
346 int broadcast)
347{
348}
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800349
350#endif
351
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000352/*
353 * Suspend / resume control
354 */
355static int acpi_idle_suspend;
356
357int acpi_processor_suspend(struct acpi_device * device, pm_message_t state)
358{
359 acpi_idle_suspend = 1;
360 return 0;
361}
362
363int acpi_processor_resume(struct acpi_device * device)
364{
365 acpi_idle_suspend = 0;
366 return 0;
367}
368
Pavel Machek61331162008-02-19 11:00:29 +0100369#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
Andi Kleenddb25f92008-01-30 13:32:41 +0100370static 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
Len Brown4f86d3a2007-10-03 18:58:00 -0400389#ifndef CONFIG_CPU_IDLE
Len Brown4be44fc2005-08-05 00:44:28 -0400390static void acpi_processor_idle(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391{
Len Brown4be44fc2005-08-05 00:44:28 -0400392 struct acpi_processor *pr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 struct acpi_processor_cx *cx = NULL;
394 struct acpi_processor_cx *next_state = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400395 int sleep_ticks = 0;
396 u32 t1, t2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 /*
399 * Interrupts must be disabled during bus mastering calculations and
400 * for C2/C3 transitions.
401 */
402 local_irq_disable();
403
Venkatesh Pallipadid5a3d322007-06-15 19:36:00 -0400404 pr = processors[smp_processor_id()];
405 if (!pr) {
406 local_irq_enable();
407 return;
408 }
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 /*
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;
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000420 if (!cx || acpi_idle_suspend) {
Peter Zijlstra7f424a82008-04-25 17:39:01 +0200421 if (pm_idle_save) {
422 pm_idle_save(); /* enables IRQs */
423 } else {
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800424 acpi_safe_halt();
Venki Pallipadi71e93d12008-03-13 17:18:19 -0700425 local_irq_enable();
Peter Zijlstra7f424a82008-04-25 17:39:01 +0200426 }
Venki Pallipadi71e93d12008-03-13 17:18:19 -0700427
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800428 return;
429 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431 /*
432 * Check BM Activity
433 * -----------------
434 * Check for bus mastering activity (if required), record, and check
435 * for demotion.
436 */
437 if (pr->flags.bm_check) {
Len Brown4be44fc2005-08-05 00:44:28 -0400438 u32 bm_status = 0;
439 unsigned long diff = jiffies - pr->power.bm_check_timestamp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Dominik Brodowskic5ab81c2006-06-24 19:37:00 -0400441 if (diff > 31)
442 diff = 31;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
Dominik Brodowskic5ab81c2006-06-24 19:37:00 -0400444 pr->power.bm_activity <<= diff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
Bob Moored8c71b62007-02-02 19:48:21 +0300446 acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 if (bm_status) {
Dominik Brodowskic5ab81c2006-06-24 19:37:00 -0400448 pr->power.bm_activity |= 0x1;
Bob Moored8c71b62007-02-02 19:48:21 +0300449 acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 }
451 /*
452 * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
453 * the true state of bus mastering activity; forcing us to
454 * manually check the BMIDEA bit of each IDE channel.
455 */
456 else if (errata.piix4.bmisx) {
457 if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
Len Brown4be44fc2005-08-05 00:44:28 -0400458 || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
Dominik Brodowskic5ab81c2006-06-24 19:37:00 -0400459 pr->power.bm_activity |= 0x1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 }
461
462 pr->power.bm_check_timestamp = jiffies;
463
464 /*
Dominik Brodowskic4a001b2006-06-24 19:37:00 -0400465 * If bus mastering is or was active this jiffy, demote
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 * to avoid a faulty transition. Note that the processor
467 * won't enter a low-power state during this call (to this
Dominik Brodowskic4a001b2006-06-24 19:37:00 -0400468 * function) but should upon the next.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 *
470 * TBD: A better policy might be to fallback to the demotion
471 * state (use it for this quantum only) istead of
472 * demoting -- and rely on duration as our sole demotion
473 * qualification. This may, however, introduce DMA
474 * issues (e.g. floppy DMA transfer overrun/underrun).
475 */
Dominik Brodowskic4a001b2006-06-24 19:37:00 -0400476 if ((pr->power.bm_activity & 0x1) &&
477 cx->demotion.threshold.bm) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 local_irq_enable();
479 next_state = cx->demotion.state;
480 goto end;
481 }
482 }
483
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400484#ifdef CONFIG_HOTPLUG_CPU
485 /*
486 * Check for P_LVL2_UP flag before entering C2 and above on
487 * an SMP system. We do it here instead of doing it at _CST/P_LVL
488 * detection phase, to work cleanly with logical CPU hotplug.
489 */
Len Brown4f86d3a2007-10-03 18:58:00 -0400490 if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300491 !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
David Shaohua Li1e483962005-12-01 17:00:00 -0500492 cx = &pr->power.states[ACPI_STATE_C1];
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400493#endif
David Shaohua Li1e483962005-12-01 17:00:00 -0500494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 /*
496 * Sleep:
497 * ------
498 * Invoke the current Cx state to put the processor to sleep.
499 */
Nick Piggin2a298a32005-12-02 12:44:19 +1100500 if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) {
Andi Kleen495ab9c2006-06-26 13:59:11 +0200501 current_thread_info()->status &= ~TS_POLLING;
Ingo Molnar0888f06a2006-12-22 01:11:56 -0800502 /*
503 * TS_POLLING-cleared state must be visible before we
504 * test NEED_RESCHED:
505 */
506 smp_mb();
Nick Piggin2a298a32005-12-02 12:44:19 +1100507 if (need_resched()) {
Andi Kleen495ab9c2006-06-26 13:59:11 +0200508 current_thread_info()->status |= TS_POLLING;
Linus Torvaldsaf2eb172005-12-02 23:09:06 -0800509 local_irq_enable();
Nick Piggin2a298a32005-12-02 12:44:19 +1100510 return;
511 }
512 }
513
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 switch (cx->type) {
515
516 case ACPI_STATE_C1:
517 /*
518 * Invoke C1.
519 * Use the appropriate idle routine, the one that would
520 * be used without acpi C-states.
521 */
Peter Zijlstra7f424a82008-04-25 17:39:01 +0200522 if (pm_idle_save) {
523 pm_idle_save(); /* enables IRQs */
524 } else {
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800525 acpi_safe_halt();
Peter Zijlstra7f424a82008-04-25 17:39:01 +0200526 local_irq_enable();
527 }
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800528
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 /*
Len Brown4be44fc2005-08-05 00:44:28 -0400530 * TBD: Can't get time duration while in C1, as resumes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 * go to an ISR rather than here. Need to instrument
532 * base interrupt handler.
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200533 *
534 * Note: the TSC better not stop in C1, sched_clock() will
535 * skew otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 */
537 sleep_ticks = 0xFFFFFFFF;
Venki Pallipadi71e93d12008-03-13 17:18:19 -0700538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 break;
540
541 case ACPI_STATE_C2:
542 /* Get start time (ticks) */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300543 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200544 /* Tell the scheduler that we are going deep-idle: */
545 sched_clock_idle_sleep_event();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 /* Invoke C2 */
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800547 acpi_state_timer_broadcast(pr, cx, 1);
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700548 acpi_cstate_enter(cx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 /* Get end time (ticks) */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300550 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
john stultz539eb112006-06-26 00:25:10 -0700551
Pavel Machek61331162008-02-19 11:00:29 +0100552#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
john stultz539eb112006-06-26 00:25:10 -0700553 /* TSC halts in C2, so notify users */
Andi Kleenddb25f92008-01-30 13:32:41 +0100554 if (tsc_halts_in_c(ACPI_STATE_C2))
555 mark_tsc_unstable("possible TSC halt in C2");
john stultz539eb112006-06-26 00:25:10 -0700556#endif
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200557 /* Compute time (ticks) that we were actually asleep */
558 sleep_ticks = ticks_elapsed(t1, t2);
559
560 /* Tell the scheduler how much we idled: */
561 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
562
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 /* Re-enable interrupts */
564 local_irq_enable();
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200565 /* Do not account our idle-switching overhead: */
566 sleep_ticks -= cx->latency_ticks + C2_OVERHEAD;
567
Andi Kleen495ab9c2006-06-26 13:59:11 +0200568 current_thread_info()->status |= TS_POLLING;
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800569 acpi_state_timer_broadcast(pr, cx, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 break;
571
572 case ACPI_STATE_C3:
Venki Pallipadibde6f5f2008-01-30 13:32:01 +0100573 acpi_unlazy_tlb(smp_processor_id());
Venkatesh Pallipadi18eab852007-06-15 19:37:00 -0400574 /*
Thomas Gleixnere17bcb42007-12-07 19:16:17 +0100575 * Must be done before busmaster disable as we might
576 * need to access HPET !
577 */
578 acpi_state_timer_broadcast(pr, cx, 1);
579 /*
Venkatesh Pallipadi18eab852007-06-15 19:37:00 -0400580 * disable bus master
581 * bm_check implies we need ARB_DIS
582 * !bm_check implies we need cache flush
583 * bm_control implies whether we can do ARB_DIS
584 *
585 * That leaves a case where bm_check is set and bm_control is
586 * not set. In that case we cannot do much, we enter C3
587 * without doing anything.
588 */
589 if (pr->flags.bm_check && pr->flags.bm_control) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400590 if (atomic_inc_return(&c3_cpu_count) ==
Len Brown4be44fc2005-08-05 00:44:28 -0400591 num_online_cpus()) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400592 /*
593 * All CPUs are trying to go to C3
594 * Disable bus master arbitration
595 */
Bob Moored8c71b62007-02-02 19:48:21 +0300596 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1);
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400597 }
Venkatesh Pallipadi18eab852007-06-15 19:37:00 -0400598 } else if (!pr->flags.bm_check) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400599 /* SMP with no shared cache... Invalidate cache */
600 ACPI_FLUSH_CPU_CACHE();
601 }
Len Brown4be44fc2005-08-05 00:44:28 -0400602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 /* Get start time (ticks) */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300604 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 /* Invoke C3 */
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200606 /* Tell the scheduler that we are going deep-idle: */
607 sched_clock_idle_sleep_event();
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700608 acpi_cstate_enter(cx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 /* Get end time (ticks) */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300610 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
Venkatesh Pallipadi18eab852007-06-15 19:37:00 -0400611 if (pr->flags.bm_check && pr->flags.bm_control) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400612 /* Enable bus master arbitration */
613 atomic_dec(&c3_cpu_count);
Bob Moored8c71b62007-02-02 19:48:21 +0300614 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400615 }
616
Pavel Machek61331162008-02-19 11:00:29 +0100617#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
john stultz539eb112006-06-26 00:25:10 -0700618 /* TSC halts in C3, so notify users */
Andi Kleenddb25f92008-01-30 13:32:41 +0100619 if (tsc_halts_in_c(ACPI_STATE_C3))
620 mark_tsc_unstable("TSC halts in C3");
john stultz539eb112006-06-26 00:25:10 -0700621#endif
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200622 /* Compute time (ticks) that we were actually asleep */
623 sleep_ticks = ticks_elapsed(t1, t2);
624 /* Tell the scheduler how much we idled: */
625 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
626
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 /* Re-enable interrupts */
628 local_irq_enable();
Ingo Molnar2aa44d02007-08-23 15:18:02 +0200629 /* Do not account our idle-switching overhead: */
630 sleep_ticks -= cx->latency_ticks + C3_OVERHEAD;
631
Andi Kleen495ab9c2006-06-26 13:59:11 +0200632 current_thread_info()->status |= TS_POLLING;
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800633 acpi_state_timer_broadcast(pr, cx, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 break;
635
636 default:
637 local_irq_enable();
638 return;
639 }
Dominik Brodowskia3c65982006-06-24 19:37:00 -0400640 cx->usage++;
641 if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0))
642 cx->time += sleep_ticks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
644 next_state = pr->power.state;
645
David Shaohua Li1e483962005-12-01 17:00:00 -0500646#ifdef CONFIG_HOTPLUG_CPU
647 /* Don't do promotion/demotion */
648 if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) &&
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300649 !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) {
David Shaohua Li1e483962005-12-01 17:00:00 -0500650 next_state = cx;
651 goto end;
652 }
653#endif
654
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 /*
656 * Promotion?
657 * ----------
658 * Track the number of longs (time asleep is greater than threshold)
659 * and promote when the count threshold is reached. Note that bus
660 * mastering activity may prevent promotions.
661 * Do not promote above max_cstate.
662 */
663 if (cx->promotion.state &&
664 ((cx->promotion.state - pr->power.states) <= max_cstate)) {
Arjan van de Ven5c875792006-09-30 23:27:17 -0700665 if (sleep_ticks > cx->promotion.threshold.ticks &&
Mark Grossf011e2e2008-02-04 22:30:09 -0800666 cx->promotion.state->latency <=
667 pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 cx->promotion.count++;
Len Brown4be44fc2005-08-05 00:44:28 -0400669 cx->demotion.count = 0;
670 if (cx->promotion.count >=
671 cx->promotion.threshold.count) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 if (pr->flags.bm_check) {
Len Brown4be44fc2005-08-05 00:44:28 -0400673 if (!
674 (pr->power.bm_activity & cx->
675 promotion.threshold.bm)) {
676 next_state =
677 cx->promotion.state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 goto end;
679 }
Len Brown4be44fc2005-08-05 00:44:28 -0400680 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 next_state = cx->promotion.state;
682 goto end;
683 }
684 }
685 }
686 }
687
688 /*
689 * Demotion?
690 * ---------
691 * Track the number of shorts (time asleep is less than time threshold)
692 * and demote when the usage threshold is reached.
693 */
694 if (cx->demotion.state) {
695 if (sleep_ticks < cx->demotion.threshold.ticks) {
696 cx->demotion.count++;
697 cx->promotion.count = 0;
698 if (cx->demotion.count >= cx->demotion.threshold.count) {
699 next_state = cx->demotion.state;
700 goto end;
701 }
702 }
703 }
704
Len Brown4be44fc2005-08-05 00:44:28 -0400705 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 /*
707 * Demote if current state exceeds max_cstate
Arjan van de Ven5c875792006-09-30 23:27:17 -0700708 * or if the latency of the current state is unacceptable
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 */
Arjan van de Ven5c875792006-09-30 23:27:17 -0700710 if ((pr->power.state - pr->power.states) > max_cstate ||
Mark Grossf011e2e2008-02-04 22:30:09 -0800711 pr->power.state->latency >
712 pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 if (cx->demotion.state)
714 next_state = cx->demotion.state;
715 }
716
717 /*
718 * New Cx State?
719 * -------------
720 * If we're going to start using a new Cx state we must clean up
721 * from the previous and prepare to use the new.
722 */
723 if (next_state != pr->power.state)
724 acpi_processor_power_activate(pr, next_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725}
726
Len Brown4be44fc2005-08-05 00:44:28 -0400727static int acpi_processor_set_power_policy(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728{
729 unsigned int i;
730 unsigned int state_is_set = 0;
731 struct acpi_processor_cx *lower = NULL;
732 struct acpi_processor_cx *higher = NULL;
733 struct acpi_processor_cx *cx;
734
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
736 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400737 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
739 /*
740 * This function sets the default Cx state policy (OS idle handler).
741 * Our scheme is to promote quickly to C2 but more conservatively
742 * to C3. We're favoring C2 for its characteristics of low latency
743 * (quick response), good power savings, and ability to allow bus
744 * mastering activity. Note that the Cx state policy is completely
745 * customizable and can be altered dynamically.
746 */
747
748 /* startup state */
Len Brown4be44fc2005-08-05 00:44:28 -0400749 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 cx = &pr->power.states[i];
751 if (!cx->valid)
752 continue;
753
754 if (!state_is_set)
755 pr->power.state = cx;
756 state_is_set++;
757 break;
Len Brown4be44fc2005-08-05 00:44:28 -0400758 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
760 if (!state_is_set)
Patrick Mocheld550d982006-06-27 00:41:40 -0400761 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
763 /* demotion */
Len Brown4be44fc2005-08-05 00:44:28 -0400764 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 cx = &pr->power.states[i];
766 if (!cx->valid)
767 continue;
768
769 if (lower) {
770 cx->demotion.state = lower;
771 cx->demotion.threshold.ticks = cx->latency_ticks;
772 cx->demotion.threshold.count = 1;
773 if (cx->type == ACPI_STATE_C3)
774 cx->demotion.threshold.bm = bm_history;
775 }
776
777 lower = cx;
778 }
779
780 /* promotion */
781 for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) {
782 cx = &pr->power.states[i];
783 if (!cx->valid)
784 continue;
785
786 if (higher) {
Len Brown4be44fc2005-08-05 00:44:28 -0400787 cx->promotion.state = higher;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 cx->promotion.threshold.ticks = cx->latency_ticks;
789 if (cx->type >= ACPI_STATE_C2)
790 cx->promotion.threshold.count = 4;
791 else
792 cx->promotion.threshold.count = 10;
793 if (higher->type == ACPI_STATE_C3)
794 cx->promotion.threshold.bm = bm_history;
795 }
796
797 higher = cx;
798 }
799
Patrick Mocheld550d982006-06-27 00:41:40 -0400800 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801}
Len Brown4f86d3a2007-10-03 18:58:00 -0400802#endif /* !CONFIG_CPU_IDLE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
Len Brown4be44fc2005-08-05 00:44:28 -0400804static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
807 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400808 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
810 if (!pr->pblk)
Patrick Mocheld550d982006-06-27 00:41:40 -0400811 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 /* if info is obtained from pblk/fadt, type equals state */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
815 pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
816
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400817#ifndef CONFIG_HOTPLUG_CPU
818 /*
819 * Check for P_LVL2_UP flag before entering C2 and above on
Len Brown4f86d3a2007-10-03 18:58:00 -0400820 * an SMP system.
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400821 */
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300822 if ((num_online_cpus() > 1) &&
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300823 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
Patrick Mocheld550d982006-06-27 00:41:40 -0400824 return -ENODEV;
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400825#endif
826
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 /* determine C2 and C3 address from pblk */
828 pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
829 pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5;
830
831 /* determine latencies from FADT */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300832 pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency;
833 pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
835 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
836 "lvl2[0x%08x] lvl3[0x%08x]\n",
837 pr->power.states[ACPI_STATE_C2].address,
838 pr->power.states[ACPI_STATE_C3].address));
839
Patrick Mocheld550d982006-06-27 00:41:40 -0400840 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841}
842
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700843static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500844{
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700845 if (!pr->power.states[ACPI_STATE_C1].valid) {
846 /* set the first C-State to C1 */
847 /* all processors need to support C1 */
848 pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
849 pr->power.states[ACPI_STATE_C1].valid = 1;
Venkatesh Pallipadi0fda6b42008-04-09 21:31:46 -0400850 pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700851 }
852 /* the C0 state only exists as a filler in our array */
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500853 pr->power.states[ACPI_STATE_C0].valid = 1;
Patrick Mocheld550d982006-06-27 00:41:40 -0400854 return 0;
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500855}
856
Len Brown4be44fc2005-08-05 00:44:28 -0400857static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858{
Len Brown4be44fc2005-08-05 00:44:28 -0400859 acpi_status status = 0;
860 acpi_integer count;
Janosch Machowinskicf824782005-08-20 08:02:00 -0400861 int current_count;
Len Brown4be44fc2005-08-05 00:44:28 -0400862 int i;
863 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
864 union acpi_object *cst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 if (nocst)
Patrick Mocheld550d982006-06-27 00:41:40 -0400868 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700870 current_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
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"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400875 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400876 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200878 cst = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
880 /* There must be at least 2 elements */
881 if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) {
Len Brown64684632006-06-26 23:41:38 -0400882 printk(KERN_ERR PREFIX "not enough elements in _CST\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 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) {
Len Brown64684632006-06-26 23:41:38 -0400891 printk(KERN_ERR PREFIX "count given by _CST is not valid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 status = -EFAULT;
893 goto end;
894 }
895
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 /* 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
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200907 element = &(cst->package.elements[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 if (element->type != ACPI_TYPE_PACKAGE)
909 continue;
910
911 if (element->package.count != 4)
912 continue;
913
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200914 obj = &(element->package.elements[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
916 if (obj->type != ACPI_TYPE_BUFFER)
917 continue;
918
Len Brown4be44fc2005-08-05 00:44:28 -0400919 reg = (struct acpi_power_register *)obj->buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
921 if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO &&
Len Brown4be44fc2005-08-05 00:44:28 -0400922 (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 continue;
924
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 /* There should be an easy way to extract an integer... */
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200926 obj = &(element->package.elements[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 if (obj->type != ACPI_TYPE_INTEGER)
928 continue;
929
930 cx.type = obj->integer.value;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700931 /*
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++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700938 cx.address = reg->address;
939 cx.index = current_count + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800941 cx.entry_method = ACPI_CSTATE_SYSTEMIO;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700942 if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
943 if (acpi_processor_ffh_cstate_probe
944 (pr->id, &cx, reg) == 0) {
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800945 cx.entry_method = ACPI_CSTATE_FFH;
946 } else if (cx.type == ACPI_STATE_C1) {
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700947 /*
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.
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700951 * Otherwise, ignore this info and continue.
952 */
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800953 cx.entry_method = ACPI_CSTATE_HALT;
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800954 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800955 } else {
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700956 continue;
957 }
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800958 } else {
959 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x",
960 cx.address);
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700961 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962
Venkatesh Pallipadi0fda6b42008-04-09 21:31:46 -0400963 if (cx.type == ACPI_STATE_C1) {
964 cx.valid = 1;
965 }
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800966
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200967 obj = &(element->package.elements[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 if (obj->type != ACPI_TYPE_INTEGER)
969 continue;
970
971 cx.latency = obj->integer.value;
972
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200973 obj = &(element->package.elements[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 if (obj->type != ACPI_TYPE_INTEGER)
975 continue;
976
977 cx.power = obj->integer.value;
978
Janosch Machowinskicf824782005-08-20 08:02:00 -0400979 current_count++;
980 memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx));
981
982 /*
983 * We support total ACPI_PROCESSOR_MAX_POWER - 1
984 * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1)
985 */
986 if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) {
987 printk(KERN_WARNING
988 "Limiting number of power states to max (%d)\n",
989 ACPI_PROCESSOR_MAX_POWER);
990 printk(KERN_WARNING
991 "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n");
992 break;
993 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 }
995
Len Brown4be44fc2005-08-05 00:44:28 -0400996 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n",
Janosch Machowinskicf824782005-08-20 08:02:00 -0400997 current_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
999 /* Validate number of power states discovered */
Janosch Machowinskicf824782005-08-20 08:02:00 -04001000 if (current_count < 2)
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -04001001 status = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
Len Brown4be44fc2005-08-05 00:44:28 -04001003 end:
Len Brown02438d82006-06-30 03:19:10 -04001004 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
Patrick Mocheld550d982006-06-27 00:41:40 -04001006 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007}
1008
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
1010{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011
1012 if (!cx->address)
Patrick Mocheld550d982006-06-27 00:41:40 -04001013 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
1015 /*
1016 * C2 latency must be less than or equal to 100
1017 * microseconds.
1018 */
1019 else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
1020 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001021 "latency too large [%d]\n", cx->latency));
Patrick Mocheld550d982006-06-27 00:41:40 -04001022 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 }
1024
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 /*
1026 * Otherwise we've met all of our C2 requirements.
1027 * Normalize the C2 latency to expidite policy
1028 */
1029 cx->valid = 1;
Len Brown4f86d3a2007-10-03 18:58:00 -04001030
1031#ifndef CONFIG_CPU_IDLE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
Len Brown4f86d3a2007-10-03 18:58:00 -04001033#else
1034 cx->latency_ticks = cx->latency;
1035#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036
Patrick Mocheld550d982006-06-27 00:41:40 -04001037 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038}
1039
Len Brown4be44fc2005-08-05 00:44:28 -04001040static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
1041 struct acpi_processor_cx *cx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042{
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001043 static int bm_check_flag;
1044
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
1046 if (!cx->address)
Patrick Mocheld550d982006-06-27 00:41:40 -04001047 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048
1049 /*
1050 * C3 latency must be less than or equal to 1000
1051 * microseconds.
1052 */
1053 else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
1054 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001055 "latency too large [%d]\n", cx->latency));
Patrick Mocheld550d982006-06-27 00:41:40 -04001056 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 }
1058
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 /*
1060 * PIIX4 Erratum #18: We don't support C3 when Type-F (fast)
1061 * DMA transfers are used by any ISA device to avoid livelock.
1062 * Note that we could disable Type-F DMA (as recommended by
1063 * the erratum), but this is known to disrupt certain ISA
1064 * devices thus we take the conservative approach.
1065 */
1066 else if (errata.piix4.fdma) {
1067 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001068 "C3 not supported on PIIX4 with Type-F DMA\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -04001069 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 }
1071
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001072 /* All the logic here assumes flags.bm_check is same across all CPUs */
1073 if (!bm_check_flag) {
1074 /* Determine whether bm_check is needed based on CPU */
1075 acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
1076 bm_check_flag = pr->flags.bm_check;
1077 } else {
1078 pr->flags.bm_check = bm_check_flag;
1079 }
1080
1081 if (pr->flags.bm_check) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001082 if (!pr->flags.bm_control) {
Venki Pallipadied3110e2007-07-31 12:04:31 -07001083 if (pr->flags.has_cst != 1) {
1084 /* bus mastering control is necessary */
1085 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1086 "C3 support requires BM control\n"));
1087 return;
1088 } else {
1089 /* Here we enter C3 without bus mastering */
1090 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1091 "C3 support without BM control\n"));
1092 }
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001093 }
1094 } else {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001095 /*
1096 * WBINVD should be set in fadt, for C3 state to be
1097 * supported on when bm_check is not required.
1098 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001099 if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001100 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001101 "Cache invalidation should work properly"
1102 " for C3 to be enabled on SMP systems\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -04001103 return;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001104 }
Bob Moored8c71b62007-02-02 19:48:21 +03001105 acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001106 }
1107
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 /*
1109 * Otherwise we've met all of our C3 requirements.
1110 * Normalize the C3 latency to expidite policy. Enable
1111 * checking of bus mastering status (bm_check) so we can
1112 * use this in our C3 policy
1113 */
1114 cx->valid = 1;
Len Brown4f86d3a2007-10-03 18:58:00 -04001115
1116#ifndef CONFIG_CPU_IDLE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
Len Brown4f86d3a2007-10-03 18:58:00 -04001118#else
1119 cx->latency_ticks = cx->latency;
1120#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121
Patrick Mocheld550d982006-06-27 00:41:40 -04001122 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123}
1124
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125static int acpi_processor_power_verify(struct acpi_processor *pr)
1126{
1127 unsigned int i;
1128 unsigned int working = 0;
Venkatesh Pallipadi6eb0a0f2006-01-11 22:44:21 +01001129
Thomas Gleixner169a0ab2007-02-16 01:27:55 -08001130 pr->power.timer_broadcast_on_state = INT_MAX;
Venkatesh Pallipadi6eb0a0f2006-01-11 22:44:21 +01001131
Len Brown4be44fc2005-08-05 00:44:28 -04001132 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 struct acpi_processor_cx *cx = &pr->power.states[i];
1134
1135 switch (cx->type) {
1136 case ACPI_STATE_C1:
1137 cx->valid = 1;
1138 break;
1139
1140 case ACPI_STATE_C2:
1141 acpi_processor_power_verify_c2(cx);
Linus Torvalds296d93c2007-03-23 08:03:47 -07001142 if (cx->valid)
Thomas Gleixner169a0ab2007-02-16 01:27:55 -08001143 acpi_timer_check_state(i, pr, cx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 break;
1145
1146 case ACPI_STATE_C3:
1147 acpi_processor_power_verify_c3(pr, cx);
Linus Torvalds296d93c2007-03-23 08:03:47 -07001148 if (cx->valid)
Thomas Gleixner169a0ab2007-02-16 01:27:55 -08001149 acpi_timer_check_state(i, pr, cx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 break;
1151 }
1152
1153 if (cx->valid)
1154 working++;
1155 }
1156
Thomas Gleixner169a0ab2007-02-16 01:27:55 -08001157 acpi_propagate_timer_broadcast(pr);
Andi Kleenbd663342006-03-25 16:31:07 +01001158
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 return (working);
1160}
1161
Len Brown4be44fc2005-08-05 00:44:28 -04001162static int acpi_processor_get_power_info(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163{
1164 unsigned int i;
1165 int result;
1166
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
1168 /* NOTE: the idle thread may not be running while calling
1169 * this function */
1170
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -07001171 /* Zero initialize all the C-states info. */
1172 memset(pr->power.states, 0, sizeof(pr->power.states));
1173
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 result = acpi_processor_get_power_info_cst(pr);
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -04001175 if (result == -ENODEV)
Darrick J. Wongc5a114f2006-10-19 23:28:28 -07001176 result = acpi_processor_get_power_info_fadt(pr);
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -04001177
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -07001178 if (result)
1179 return result;
1180
1181 acpi_processor_get_power_info_default(pr);
1182
Janosch Machowinskicf824782005-08-20 08:02:00 -04001183 pr->power.count = acpi_processor_power_verify(pr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184
Len Brown4f86d3a2007-10-03 18:58:00 -04001185#ifndef CONFIG_CPU_IDLE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 /*
1187 * Set Default Policy
1188 * ------------------
1189 * Now that we know which states are supported, set the default
1190 * policy. Note that this policy can be changed dynamically
1191 * (e.g. encourage deeper sleeps to conserve battery life when
1192 * not on AC).
1193 */
1194 result = acpi_processor_set_power_policy(pr);
1195 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -04001196 return result;
Len Brown4f86d3a2007-10-03 18:58:00 -04001197#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
1199 /*
1200 * if one state of type C2 or C3 is available, mark this
1201 * CPU as being "idle manageable"
1202 */
1203 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -05001204 if (pr->power.states[i].valid) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 pr->power.count = i;
Linus Torvalds2203d6e2005-11-18 07:29:51 -08001206 if (pr->power.states[i].type >= ACPI_STATE_C2)
1207 pr->flags.power = 1;
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -05001208 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 }
1210
Patrick Mocheld550d982006-06-27 00:41:40 -04001211 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212}
1213
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
1215{
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001216 struct acpi_processor *pr = seq->private;
Len Brown4be44fc2005-08-05 00:44:28 -04001217 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219
1220 if (!pr)
1221 goto end;
1222
1223 seq_printf(seq, "active state: C%zd\n"
Len Brown4be44fc2005-08-05 00:44:28 -04001224 "max_cstate: C%d\n"
Arjan van de Ven5c875792006-09-30 23:27:17 -07001225 "bus master activity: %08x\n"
1226 "maximum allowed latency: %d usec\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001227 pr->power.state ? pr->power.state - pr->power.states : 0,
Arjan van de Ven5c875792006-09-30 23:27:17 -07001228 max_cstate, (unsigned)pr->power.bm_activity,
Mark Grossf011e2e2008-02-04 22:30:09 -08001229 pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
1231 seq_puts(seq, "states:\n");
1232
1233 for (i = 1; i <= pr->power.count; i++) {
1234 seq_printf(seq, " %cC%d: ",
Len Brown4be44fc2005-08-05 00:44:28 -04001235 (&pr->power.states[i] ==
1236 pr->power.state ? '*' : ' '), i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237
1238 if (!pr->power.states[i].valid) {
1239 seq_puts(seq, "<not supported>\n");
1240 continue;
1241 }
1242
1243 switch (pr->power.states[i].type) {
1244 case ACPI_STATE_C1:
1245 seq_printf(seq, "type[C1] ");
1246 break;
1247 case ACPI_STATE_C2:
1248 seq_printf(seq, "type[C2] ");
1249 break;
1250 case ACPI_STATE_C3:
1251 seq_printf(seq, "type[C3] ");
1252 break;
1253 default:
1254 seq_printf(seq, "type[--] ");
1255 break;
1256 }
1257
1258 if (pr->power.states[i].promotion.state)
1259 seq_printf(seq, "promotion[C%zd] ",
Len Brown4be44fc2005-08-05 00:44:28 -04001260 (pr->power.states[i].promotion.state -
1261 pr->power.states));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 else
1263 seq_puts(seq, "promotion[--] ");
1264
1265 if (pr->power.states[i].demotion.state)
1266 seq_printf(seq, "demotion[C%zd] ",
Len Brown4be44fc2005-08-05 00:44:28 -04001267 (pr->power.states[i].demotion.state -
1268 pr->power.states));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 else
1270 seq_puts(seq, "demotion[--] ");
1271
Dominik Brodowskia3c65982006-06-24 19:37:00 -04001272 seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001273 pr->power.states[i].latency,
Dominik Brodowskia3c65982006-06-24 19:37:00 -04001274 pr->power.states[i].usage,
Alexey Starikovskiyb0b7eaa2007-01-25 22:39:44 -05001275 (unsigned long long)pr->power.states[i].time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 }
1277
Len Brown4be44fc2005-08-05 00:44:28 -04001278 end:
Patrick Mocheld550d982006-06-27 00:41:40 -04001279 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280}
1281
1282static int acpi_processor_power_open_fs(struct inode *inode, struct file *file)
1283{
1284 return single_open(file, acpi_processor_power_seq_show,
Len Brown4be44fc2005-08-05 00:44:28 -04001285 PDE(inode)->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286}
1287
Arjan van de Vend7508032006-07-04 13:06:00 -04001288static const struct file_operations acpi_processor_power_fops = {
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -07001289 .owner = THIS_MODULE,
Len Brown4be44fc2005-08-05 00:44:28 -04001290 .open = acpi_processor_power_open_fs,
1291 .read = seq_read,
1292 .llseek = seq_lseek,
1293 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294};
1295
Len Brown4f86d3a2007-10-03 18:58:00 -04001296#ifndef CONFIG_CPU_IDLE
1297
1298int acpi_processor_cst_has_changed(struct acpi_processor *pr)
1299{
1300 int result = 0;
1301
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001302 if (boot_option_idle_override)
1303 return 0;
Len Brown4f86d3a2007-10-03 18:58:00 -04001304
1305 if (!pr)
1306 return -EINVAL;
1307
1308 if (nocst) {
1309 return -ENODEV;
1310 }
1311
1312 if (!pr->flags.power_setup_done)
1313 return -ENODEV;
1314
1315 /* Fall back to the default idle loop */
1316 pm_idle = pm_idle_save;
1317 synchronize_sched(); /* Relies on interrupts forcing exit from idle. */
1318
1319 pr->flags.power = 0;
1320 result = acpi_processor_get_power_info(pr);
1321 if ((pr->flags.power == 1) && (pr->flags.power_setup_done))
1322 pm_idle = acpi_processor_idle;
1323
1324 return result;
1325}
1326
Andrew Morton1fec74a2006-10-17 00:09:58 -07001327#ifdef CONFIG_SMP
Arjan van de Ven5c875792006-09-30 23:27:17 -07001328static void smp_callback(void *v)
1329{
1330 /* we already woke the CPU up, nothing more to do */
1331}
1332
1333/*
1334 * This function gets called when a part of the kernel has a new latency
1335 * requirement. This means we need to get all processors out of their C-state,
1336 * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that
1337 * wakes them all right up.
1338 */
1339static int acpi_processor_latency_notify(struct notifier_block *b,
1340 unsigned long l, void *v)
1341{
1342 smp_call_function(smp_callback, NULL, 0, 1);
1343 return NOTIFY_OK;
1344}
1345
1346static struct notifier_block acpi_processor_latency_notifier = {
1347 .notifier_call = acpi_processor_latency_notify,
1348};
Len Brown4f86d3a2007-10-03 18:58:00 -04001349
Andrew Morton1fec74a2006-10-17 00:09:58 -07001350#endif
Arjan van de Ven5c875792006-09-30 23:27:17 -07001351
Len Brown4f86d3a2007-10-03 18:58:00 -04001352#else /* CONFIG_CPU_IDLE */
1353
1354/**
1355 * acpi_idle_bm_check - checks if bus master activity was detected
1356 */
1357static int acpi_idle_bm_check(void)
1358{
1359 u32 bm_status = 0;
1360
1361 acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
1362 if (bm_status)
1363 acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
1364 /*
1365 * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
1366 * the true state of bus mastering activity; forcing us to
1367 * manually check the BMIDEA bit of each IDE channel.
1368 */
1369 else if (errata.piix4.bmisx) {
1370 if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
1371 || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
1372 bm_status = 1;
1373 }
1374 return bm_status;
1375}
1376
1377/**
1378 * acpi_idle_update_bm_rld - updates the BM_RLD bit depending on target state
1379 * @pr: the processor
1380 * @target: the new target state
1381 */
1382static inline void acpi_idle_update_bm_rld(struct acpi_processor *pr,
1383 struct acpi_processor_cx *target)
1384{
1385 if (pr->flags.bm_rld_set && target->type != ACPI_STATE_C3) {
1386 acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
1387 pr->flags.bm_rld_set = 0;
1388 }
1389
1390 if (!pr->flags.bm_rld_set && target->type == ACPI_STATE_C3) {
1391 acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
1392 pr->flags.bm_rld_set = 1;
1393 }
1394}
1395
1396/**
1397 * acpi_idle_do_entry - a helper function that does C2 and C3 type entry
1398 * @cx: cstate data
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -08001399 *
1400 * Caller disables interrupt before call and enables interrupt after return.
Len Brown4f86d3a2007-10-03 18:58:00 -04001401 */
1402static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
1403{
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -08001404 if (cx->entry_method == ACPI_CSTATE_FFH) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001405 /* Call into architectural FFH based C-state */
1406 acpi_processor_ffh_cstate_enter(cx);
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -08001407 } else if (cx->entry_method == ACPI_CSTATE_HALT) {
1408 acpi_safe_halt();
Len Brown4f86d3a2007-10-03 18:58:00 -04001409 } else {
1410 int unused;
1411 /* IO port based C-state */
1412 inb(cx->address);
1413 /* Dummy wait op - must do something useless after P_LVL2 read
1414 because chipsets cannot guarantee that STPCLK# signal
1415 gets asserted in time to freeze execution properly. */
1416 unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
1417 }
1418}
1419
1420/**
1421 * acpi_idle_enter_c1 - enters an ACPI C1 state-type
1422 * @dev: the target CPU
1423 * @state: the state data
1424 *
1425 * This is equivalent to the HALT instruction.
1426 */
1427static int acpi_idle_enter_c1(struct cpuidle_device *dev,
1428 struct cpuidle_state *state)
1429{
venkatesh.pallipadi@intel.com9b12e182008-01-31 17:35:05 -08001430 u32 t1, t2;
Len Brown4f86d3a2007-10-03 18:58:00 -04001431 struct acpi_processor *pr;
1432 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
venkatesh.pallipadi@intel.com9b12e182008-01-31 17:35:05 -08001433
Len Brown4f86d3a2007-10-03 18:58:00 -04001434 pr = processors[smp_processor_id()];
1435
1436 if (unlikely(!pr))
1437 return 0;
1438
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -08001439 local_irq_disable();
Venkatesh Pallipadib077fba2008-02-11 15:20:27 -08001440
1441 /* Do not access any ACPI IO ports in suspend path */
1442 if (acpi_idle_suspend) {
1443 acpi_safe_halt();
1444 local_irq_enable();
1445 return 0;
1446 }
1447
Len Brown4f86d3a2007-10-03 18:58:00 -04001448 if (pr->flags.bm_check)
1449 acpi_idle_update_bm_rld(pr, cx);
1450
venkatesh.pallipadi@intel.com9b12e182008-01-31 17:35:05 -08001451 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -08001452 acpi_idle_do_entry(cx);
venkatesh.pallipadi@intel.com9b12e182008-01-31 17:35:05 -08001453 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
Len Brown4f86d3a2007-10-03 18:58:00 -04001454
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -08001455 local_irq_enable();
Len Brown4f86d3a2007-10-03 18:58:00 -04001456 cx->usage++;
1457
venkatesh.pallipadi@intel.com9b12e182008-01-31 17:35:05 -08001458 return ticks_elapsed_in_us(t1, t2);
Len Brown4f86d3a2007-10-03 18:58:00 -04001459}
1460
1461/**
1462 * acpi_idle_enter_simple - enters an ACPI state without BM handling
1463 * @dev: the target CPU
1464 * @state: the state data
1465 */
1466static int acpi_idle_enter_simple(struct cpuidle_device *dev,
1467 struct cpuidle_state *state)
1468{
1469 struct acpi_processor *pr;
1470 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
1471 u32 t1, t2;
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001472 int sleep_ticks = 0;
1473
Len Brown4f86d3a2007-10-03 18:58:00 -04001474 pr = processors[smp_processor_id()];
1475
1476 if (unlikely(!pr))
1477 return 0;
1478
Len Browne1964412007-10-04 01:23:47 -04001479 if (acpi_idle_suspend)
1480 return(acpi_idle_enter_c1(dev, state));
1481
Len Brown4f86d3a2007-10-03 18:58:00 -04001482 local_irq_disable();
1483 current_thread_info()->status &= ~TS_POLLING;
1484 /*
1485 * TS_POLLING-cleared state must be visible before we test
1486 * NEED_RESCHED:
1487 */
1488 smp_mb();
1489
1490 if (unlikely(need_resched())) {
1491 current_thread_info()->status |= TS_POLLING;
1492 local_irq_enable();
1493 return 0;
1494 }
1495
Thomas Gleixnere17bcb42007-12-07 19:16:17 +01001496 /*
1497 * Must be done before busmaster disable as we might need to
1498 * access HPET !
1499 */
1500 acpi_state_timer_broadcast(pr, cx, 1);
1501
1502 if (pr->flags.bm_check)
1503 acpi_idle_update_bm_rld(pr, cx);
1504
Len Brown4f86d3a2007-10-03 18:58:00 -04001505 if (cx->type == ACPI_STATE_C3)
1506 ACPI_FLUSH_CPU_CACHE();
1507
1508 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001509 /* Tell the scheduler that we are going deep-idle: */
1510 sched_clock_idle_sleep_event();
Len Brown4f86d3a2007-10-03 18:58:00 -04001511 acpi_idle_do_entry(cx);
1512 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
1513
Pavel Machek61331162008-02-19 11:00:29 +01001514#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
Len Brown4f86d3a2007-10-03 18:58:00 -04001515 /* TSC could halt in idle, so notify users */
Andi Kleenddb25f92008-01-30 13:32:41 +01001516 if (tsc_halts_in_c(cx->type))
1517 mark_tsc_unstable("TSC halts in idle");;
Len Brown4f86d3a2007-10-03 18:58:00 -04001518#endif
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001519 sleep_ticks = ticks_elapsed(t1, t2);
1520
1521 /* Tell the scheduler how much we idled: */
1522 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
Len Brown4f86d3a2007-10-03 18:58:00 -04001523
1524 local_irq_enable();
1525 current_thread_info()->status |= TS_POLLING;
1526
1527 cx->usage++;
1528
1529 acpi_state_timer_broadcast(pr, cx, 0);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001530 cx->time += sleep_ticks;
Len Brown4f86d3a2007-10-03 18:58:00 -04001531 return ticks_elapsed_in_us(t1, t2);
1532}
1533
1534static int c3_cpu_count;
1535static DEFINE_SPINLOCK(c3_lock);
1536
1537/**
1538 * acpi_idle_enter_bm - enters C3 with proper BM handling
1539 * @dev: the target CPU
1540 * @state: the state data
1541 *
1542 * If BM is detected, the deepest non-C3 idle state is entered instead.
1543 */
1544static int acpi_idle_enter_bm(struct cpuidle_device *dev,
1545 struct cpuidle_state *state)
1546{
1547 struct acpi_processor *pr;
1548 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
1549 u32 t1, t2;
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001550 int sleep_ticks = 0;
1551
Len Brown4f86d3a2007-10-03 18:58:00 -04001552 pr = processors[smp_processor_id()];
1553
1554 if (unlikely(!pr))
1555 return 0;
1556
Len Browne1964412007-10-04 01:23:47 -04001557 if (acpi_idle_suspend)
1558 return(acpi_idle_enter_c1(dev, state));
1559
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001560 if (acpi_idle_bm_check()) {
1561 if (dev->safe_state) {
1562 return dev->safe_state->enter(dev, dev->safe_state);
1563 } else {
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -08001564 local_irq_disable();
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001565 acpi_safe_halt();
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -08001566 local_irq_enable();
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001567 return 0;
1568 }
1569 }
1570
Len Brown4f86d3a2007-10-03 18:58:00 -04001571 local_irq_disable();
1572 current_thread_info()->status &= ~TS_POLLING;
1573 /*
1574 * TS_POLLING-cleared state must be visible before we test
1575 * NEED_RESCHED:
1576 */
1577 smp_mb();
1578
1579 if (unlikely(need_resched())) {
1580 current_thread_info()->status |= TS_POLLING;
1581 local_irq_enable();
1582 return 0;
1583 }
1584
Venki Pallipadi996520c2008-03-24 14:24:10 -07001585 acpi_unlazy_tlb(smp_processor_id());
1586
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001587 /* Tell the scheduler that we are going deep-idle: */
1588 sched_clock_idle_sleep_event();
Len Brown4f86d3a2007-10-03 18:58:00 -04001589 /*
1590 * Must be done before busmaster disable as we might need to
1591 * access HPET !
1592 */
1593 acpi_state_timer_broadcast(pr, cx, 1);
1594
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001595 acpi_idle_update_bm_rld(pr, cx);
Len Brown4f86d3a2007-10-03 18:58:00 -04001596
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001597 /*
1598 * disable bus master
1599 * bm_check implies we need ARB_DIS
1600 * !bm_check implies we need cache flush
1601 * bm_control implies whether we can do ARB_DIS
1602 *
1603 * That leaves a case where bm_check is set and bm_control is
1604 * not set. In that case we cannot do much, we enter C3
1605 * without doing anything.
1606 */
1607 if (pr->flags.bm_check && pr->flags.bm_control) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001608 spin_lock(&c3_lock);
1609 c3_cpu_count++;
1610 /* Disable bus master arbitration when all CPUs are in C3 */
1611 if (c3_cpu_count == num_online_cpus())
1612 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1);
1613 spin_unlock(&c3_lock);
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001614 } else if (!pr->flags.bm_check) {
1615 ACPI_FLUSH_CPU_CACHE();
1616 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001617
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001618 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
1619 acpi_idle_do_entry(cx);
1620 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
Len Brown4f86d3a2007-10-03 18:58:00 -04001621
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001622 /* Re-enable bus master arbitration */
1623 if (pr->flags.bm_check && pr->flags.bm_control) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001624 spin_lock(&c3_lock);
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001625 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
Len Brown4f86d3a2007-10-03 18:58:00 -04001626 c3_cpu_count--;
1627 spin_unlock(&c3_lock);
1628 }
1629
Pavel Machek61331162008-02-19 11:00:29 +01001630#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
Len Brown4f86d3a2007-10-03 18:58:00 -04001631 /* TSC could halt in idle, so notify users */
Andi Kleenddb25f92008-01-30 13:32:41 +01001632 if (tsc_halts_in_c(ACPI_STATE_C3))
1633 mark_tsc_unstable("TSC halts in idle");
Len Brown4f86d3a2007-10-03 18:58:00 -04001634#endif
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001635 sleep_ticks = ticks_elapsed(t1, t2);
1636 /* Tell the scheduler how much we idled: */
1637 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
Len Brown4f86d3a2007-10-03 18:58:00 -04001638
1639 local_irq_enable();
1640 current_thread_info()->status |= TS_POLLING;
1641
1642 cx->usage++;
1643
1644 acpi_state_timer_broadcast(pr, cx, 0);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001645 cx->time += sleep_ticks;
Len Brown4f86d3a2007-10-03 18:58:00 -04001646 return ticks_elapsed_in_us(t1, t2);
1647}
1648
1649struct cpuidle_driver acpi_idle_driver = {
1650 .name = "acpi_idle",
1651 .owner = THIS_MODULE,
1652};
1653
1654/**
1655 * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE
1656 * @pr: the ACPI processor
1657 */
1658static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
1659{
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -08001660 int i, count = CPUIDLE_DRIVER_STATE_START;
Len Brown4f86d3a2007-10-03 18:58:00 -04001661 struct acpi_processor_cx *cx;
1662 struct cpuidle_state *state;
1663 struct cpuidle_device *dev = &pr->power.dev;
1664
1665 if (!pr->flags.power_setup_done)
1666 return -EINVAL;
1667
1668 if (pr->flags.power == 0) {
1669 return -EINVAL;
1670 }
1671
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001672 dev->cpu = pr->id;
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -08001673 for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
1674 dev->states[i].name[0] = '\0';
1675 dev->states[i].desc[0] = '\0';
1676 }
1677
Len Brown4f86d3a2007-10-03 18:58:00 -04001678 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
1679 cx = &pr->power.states[i];
1680 state = &dev->states[count];
1681
1682 if (!cx->valid)
1683 continue;
1684
1685#ifdef CONFIG_HOTPLUG_CPU
1686 if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
1687 !pr->flags.has_cst &&
1688 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
1689 continue;
1690#endif
1691 cpuidle_set_statedata(state, cx);
1692
1693 snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -08001694 strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
Len Brown4f86d3a2007-10-03 18:58:00 -04001695 state->exit_latency = cx->latency;
Len Brown4963f622007-12-13 23:50:45 -05001696 state->target_residency = cx->latency * latency_factor;
Len Brown4f86d3a2007-10-03 18:58:00 -04001697 state->power_usage = cx->power;
1698
1699 state->flags = 0;
1700 switch (cx->type) {
1701 case ACPI_STATE_C1:
1702 state->flags |= CPUIDLE_FLAG_SHALLOW;
Venki Pallipadi8e92b662008-02-29 10:24:32 -08001703 if (cx->entry_method == ACPI_CSTATE_FFH)
1704 state->flags |= CPUIDLE_FLAG_TIME_VALID;
1705
Len Brown4f86d3a2007-10-03 18:58:00 -04001706 state->enter = acpi_idle_enter_c1;
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001707 dev->safe_state = state;
Len Brown4f86d3a2007-10-03 18:58:00 -04001708 break;
1709
1710 case ACPI_STATE_C2:
1711 state->flags |= CPUIDLE_FLAG_BALANCED;
1712 state->flags |= CPUIDLE_FLAG_TIME_VALID;
1713 state->enter = acpi_idle_enter_simple;
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001714 dev->safe_state = state;
Len Brown4f86d3a2007-10-03 18:58:00 -04001715 break;
1716
1717 case ACPI_STATE_C3:
1718 state->flags |= CPUIDLE_FLAG_DEEP;
1719 state->flags |= CPUIDLE_FLAG_TIME_VALID;
1720 state->flags |= CPUIDLE_FLAG_CHECK_BM;
1721 state->enter = pr->flags.bm_check ?
1722 acpi_idle_enter_bm :
1723 acpi_idle_enter_simple;
1724 break;
1725 }
1726
1727 count++;
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -08001728 if (count == CPUIDLE_STATE_MAX)
1729 break;
Len Brown4f86d3a2007-10-03 18:58:00 -04001730 }
1731
1732 dev->state_count = count;
1733
1734 if (!count)
1735 return -EINVAL;
1736
Len Brown4f86d3a2007-10-03 18:58:00 -04001737 return 0;
1738}
1739
1740int acpi_processor_cst_has_changed(struct acpi_processor *pr)
1741{
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001742 int ret = 0;
Len Brown4f86d3a2007-10-03 18:58:00 -04001743
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001744 if (boot_option_idle_override)
1745 return 0;
1746
Len Brown4f86d3a2007-10-03 18:58:00 -04001747 if (!pr)
1748 return -EINVAL;
1749
1750 if (nocst) {
1751 return -ENODEV;
1752 }
1753
1754 if (!pr->flags.power_setup_done)
1755 return -ENODEV;
1756
1757 cpuidle_pause_and_lock();
1758 cpuidle_disable_device(&pr->power.dev);
1759 acpi_processor_get_power_info(pr);
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001760 if (pr->flags.power) {
1761 acpi_processor_setup_cpuidle(pr);
1762 ret = cpuidle_enable_device(&pr->power.dev);
1763 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001764 cpuidle_resume_and_unlock();
1765
1766 return ret;
1767}
1768
1769#endif /* CONFIG_CPU_IDLE */
1770
Pierre Ossman7af8b662006-10-10 14:20:31 -07001771int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
Len Brown4be44fc2005-08-05 00:44:28 -04001772 struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773{
Len Brown4be44fc2005-08-05 00:44:28 -04001774 acpi_status status = 0;
Andreas Mohrb6835052006-04-27 05:25:00 -04001775 static int first_run;
Len Brown4be44fc2005-08-05 00:44:28 -04001776 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 unsigned int i;
1778
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001779 if (boot_option_idle_override)
1780 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781
1782 if (!first_run) {
1783 dmi_check_system(processor_power_dmi_table);
Alexey Starikovskiyc1c30632007-11-26 20:42:19 +01001784 max_cstate = acpi_processor_cstate_check(max_cstate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 if (max_cstate < ACPI_C_STATES_MAX)
Len Brown4be44fc2005-08-05 00:44:28 -04001786 printk(KERN_NOTICE
1787 "ACPI: processor limited to max C-state %d\n",
1788 max_cstate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 first_run++;
Mark Grossf011e2e2008-02-04 22:30:09 -08001790#if !defined(CONFIG_CPU_IDLE) && defined(CONFIG_SMP)
1791 pm_qos_add_notifier(PM_QOS_CPU_DMA_LATENCY,
1792 &acpi_processor_latency_notifier);
Andrew Morton1fec74a2006-10-17 00:09:58 -07001793#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 }
1795
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001796 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -04001797 return -EINVAL;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001798
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001799 if (acpi_gbl_FADT.cst_control && !nocst) {
Len Brown4be44fc2005-08-05 00:44:28 -04001800 status =
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001801 acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001803 ACPI_EXCEPTION((AE_INFO, status,
1804 "Notifying BIOS of _CST ability failed"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 }
1806 }
1807
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 acpi_processor_get_power_info(pr);
Len Brown4f86d3a2007-10-03 18:58:00 -04001809 pr->flags.power_setup_done = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810
1811 /*
1812 * Install the idle handler if processor power management is supported.
1813 * Note that we use previously set idle handler will be used on
1814 * platforms that only support C1.
1815 */
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001816 if (pr->flags.power) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001817#ifdef CONFIG_CPU_IDLE
1818 acpi_processor_setup_cpuidle(pr);
Len Brown4f86d3a2007-10-03 18:58:00 -04001819 if (cpuidle_register_device(&pr->power.dev))
1820 return -EIO;
1821#endif
1822
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id);
1824 for (i = 1; i <= pr->power.count; i++)
1825 if (pr->power.states[i].valid)
Len Brown4be44fc2005-08-05 00:44:28 -04001826 printk(" C%d[C%d]", i,
1827 pr->power.states[i].type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828 printk(")\n");
1829
Len Brown4f86d3a2007-10-03 18:58:00 -04001830#ifndef CONFIG_CPU_IDLE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 if (pr->id == 0) {
1832 pm_idle_save = pm_idle;
1833 pm_idle = acpi_processor_idle;
1834 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001835#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 }
1837
1838 /* 'power' [R] */
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -07001839 entry = proc_create_data(ACPI_PROCESSOR_FILE_POWER,
1840 S_IRUGO, acpi_device_dir(device),
1841 &acpi_processor_power_fops,
1842 acpi_driver_data(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 if (!entry)
Thomas Renningera6fc6722006-06-26 23:58:43 -04001844 return -EIO;
Patrick Mocheld550d982006-06-27 00:41:40 -04001845 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846}
1847
Len Brown4be44fc2005-08-05 00:44:28 -04001848int acpi_processor_power_exit(struct acpi_processor *pr,
1849 struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850{
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001851 if (boot_option_idle_override)
1852 return 0;
1853
Len Brown4f86d3a2007-10-03 18:58:00 -04001854#ifdef CONFIG_CPU_IDLE
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001855 cpuidle_unregister_device(&pr->power.dev);
Len Brown4f86d3a2007-10-03 18:58:00 -04001856#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 pr->flags.power_setup_done = 0;
1858
1859 if (acpi_device_dir(device))
Len Brown4be44fc2005-08-05 00:44:28 -04001860 remove_proc_entry(ACPI_PROCESSOR_FILE_POWER,
1861 acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862
Len Brown4f86d3a2007-10-03 18:58:00 -04001863#ifndef CONFIG_CPU_IDLE
1864
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865 /* Unregister the idle handler when processor #0 is removed. */
1866 if (pr->id == 0) {
1867 pm_idle = pm_idle_save;
1868
1869 /*
1870 * We are about to unload the current idle thread pm callback
1871 * (pm_idle), Wait for all processors to update cached/local
1872 * copies of pm_idle before proceeding.
1873 */
1874 cpu_idle_wait();
Andrew Morton1fec74a2006-10-17 00:09:58 -07001875#ifdef CONFIG_SMP
Mark Grossf011e2e2008-02-04 22:30:09 -08001876 pm_qos_remove_notifier(PM_QOS_CPU_DMA_LATENCY,
1877 &acpi_processor_latency_notifier);
Andrew Morton1fec74a2006-10-17 00:09:58 -07001878#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001880#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881
Patrick Mocheld550d982006-06-27 00:41:40 -04001882 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883}