blob: bbd066e7f854be51286760b2fed8267c62583c5f [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>
Russell Kingba84be22009-01-06 14:41:07 -080044#include <linux/irqflags.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Thomas Gleixner34349332007-02-16 01:27:54 -080046/*
47 * Include the apic definitions for x86 to have the APIC timer related defines
48 * available also for UP (on SMP it gets magically included via linux/smp.h).
49 * asm/acpi.h is not an option, as it would require more include magic. Also
50 * creating an empty asm-ia64/apic.h would just trade pest vs. cholera.
51 */
52#ifdef CONFIG_X86
53#include <asm/apic.h>
54#endif
55
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <asm/io.h>
57#include <asm/uaccess.h>
58
59#include <acpi/acpi_bus.h>
60#include <acpi/processor.h>
Zhao Yakuic1e3b372008-06-24 17:58:53 +080061#include <asm/processor.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Len Browna192a952009-07-28 16:45:54 -040063#define PREFIX "ACPI: "
64
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#define ACPI_PROCESSOR_CLASS "processor"
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#define _COMPONENT ACPI_PROCESSOR_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050067ACPI_MODULE_NAME("processor_idle");
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#define ACPI_PROCESSOR_FILE_POWER "power"
Ingo Molnar2aa44d02007-08-23 15:18:02 +020069#define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY)
Len Brown4f86d3a2007-10-03 18:58:00 -040070#define C2_OVERHEAD 1 /* 1us */
71#define C3_OVERHEAD 1 /* 1us */
Len Brown4f86d3a2007-10-03 18:58:00 -040072#define PM_TIMER_TICKS_TO_US(p) (((p) * 1000)/(PM_TIMER_FREQUENCY/1000))
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Len Brown4f86d3a2007-10-03 18:58:00 -040074static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
75module_param(max_cstate, uint, 0000);
Andreas Mohrb6835052006-04-27 05:25:00 -040076static unsigned int nocst __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077module_param(nocst, uint, 0000);
78
Len Brown25de5712007-12-14 00:24:15 -050079static unsigned int latency_factor __read_mostly = 2;
Len Brown4963f622007-12-13 23:50:45 -050080module_param(latency_factor, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
alex.shiff69f2b2009-03-04 11:55:26 -080082static s64 us_to_pm_timer_ticks(s64 t)
83{
84 return div64_u64(t * PM_TIMER_FREQUENCY, 1000000);
85}
Linus Torvalds1da177e2005-04-16 15:20:36 -070086/*
87 * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
88 * For now disable this. Probably a bug somewhere else.
89 *
90 * To skip this limit, boot/load with a large max_cstate limit.
91 */
Jeff Garzik18552562007-10-03 15:15:40 -040092static int set_max_cstate(const struct dmi_system_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
94 if (max_cstate > ACPI_PROCESSOR_MAX_POWER)
95 return 0;
96
Len Brown3d356002005-08-03 00:22:52 -040097 printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate."
Len Brown4be44fc2005-08-05 00:44:28 -040098 " Override with \"processor.max_cstate=%d\"\n", id->ident,
99 (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Len Brown3d356002005-08-03 00:22:52 -0400101 max_cstate = (long)id->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 return 0;
104}
105
Ashok Raj7ded5682006-02-03 21:51:23 +0100106/* Actually this shouldn't be __cpuinitdata, would be better to fix the
107 callers to only run once -AK */
108static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = {
Thomas Rosner876c1842006-01-06 01:31:00 -0500109 { set_max_cstate, "Clevo 5600D", {
110 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
111 DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")},
Len Brown4be44fc2005-08-05 00:44:28 -0400112 (void *)2},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 {},
114};
115
Len Brown4f86d3a2007-10-03 18:58:00 -0400116
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800117/*
118 * Callers should disable interrupts before the call and enable
119 * interrupts after return.
120 */
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500121static void acpi_safe_halt(void)
122{
123 current_thread_info()->status &= ~TS_POLLING;
124 /*
125 * TS_POLLING-cleared state must be visible before we
126 * test NEED_RESCHED:
127 */
128 smp_mb();
Venki Pallipadi71e93d12008-03-13 17:18:19 -0700129 if (!need_resched()) {
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500130 safe_halt();
Venki Pallipadi71e93d12008-03-13 17:18:19 -0700131 local_irq_disable();
132 }
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500133 current_thread_info()->status |= TS_POLLING;
134}
135
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800136#ifdef ARCH_APICTIMER_STOPS_ON_C3
137
138/*
139 * Some BIOS implementations switch to C3 in the published C2 state.
Linus Torvalds296d93c2007-03-23 08:03:47 -0700140 * This seems to be a common problem on AMD boxen, but other vendors
141 * are affected too. We pick the most conservative approach: we assume
142 * that the local APIC stops in both C2 and C3.
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800143 */
Len Brown7e275cc2009-05-15 02:08:44 -0400144static void lapic_timer_check_state(int state, struct acpi_processor *pr,
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800145 struct acpi_processor_cx *cx)
146{
147 struct acpi_processor_power *pwr = &pr->power;
Thomas Gleixnere585bef2007-03-23 16:08:01 +0100148 u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2;
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800149
Venkatesh Pallipadidb954b52009-04-06 18:51:29 -0700150 if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT))
151 return;
152
Shaohua Li87ad57b2009-05-19 16:09:42 +0800153 if (boot_cpu_has(X86_FEATURE_AMDC1E))
154 type = ACPI_STATE_C1;
155
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800156 /*
157 * Check, if one of the previous states already marked the lapic
158 * unstable
159 */
160 if (pwr->timer_broadcast_on_state < state)
161 return;
162
Thomas Gleixnere585bef2007-03-23 16:08:01 +0100163 if (cx->type >= type)
Linus Torvalds296d93c2007-03-23 08:03:47 -0700164 pr->power.timer_broadcast_on_state = state;
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800165}
166
Suresh Siddhaf833bab2009-08-17 14:34:59 -0700167static void lapic_timer_propagate_broadcast(void *arg)
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800168{
Suresh Siddhaf833bab2009-08-17 14:34:59 -0700169 struct acpi_processor *pr = (struct acpi_processor *) arg;
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800170 unsigned long reason;
171
172 reason = pr->power.timer_broadcast_on_state < INT_MAX ?
173 CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF;
174
175 clockevents_notify(reason, &pr->id);
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800176}
177
178/* Power(C) State timer broadcast control */
Len Brown7e275cc2009-05-15 02:08:44 -0400179static void lapic_timer_state_broadcast(struct acpi_processor *pr,
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800180 struct acpi_processor_cx *cx,
181 int broadcast)
182{
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800183 int state = cx - pr->power.states;
184
185 if (state >= pr->power.timer_broadcast_on_state) {
186 unsigned long reason;
187
188 reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER :
189 CLOCK_EVT_NOTIFY_BROADCAST_EXIT;
190 clockevents_notify(reason, &pr->id);
191 }
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800192}
193
194#else
195
Len Brown7e275cc2009-05-15 02:08:44 -0400196static void lapic_timer_check_state(int state, struct acpi_processor *pr,
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800197 struct acpi_processor_cx *cstate) { }
Len Brown7e275cc2009-05-15 02:08:44 -0400198static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { }
199static void lapic_timer_state_broadcast(struct acpi_processor *pr,
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800200 struct acpi_processor_cx *cx,
201 int broadcast)
202{
203}
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800204
205#endif
206
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000207/*
208 * Suspend / resume control
209 */
210static int acpi_idle_suspend;
Len Brown815ab0f2009-05-07 22:19:45 -0400211static u32 saved_bm_rld;
212
213static void acpi_idle_bm_rld_save(void)
214{
215 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
216}
217static void acpi_idle_bm_rld_restore(void)
218{
219 u32 resumed_bm_rld;
220
221 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
222
223 if (resumed_bm_rld != saved_bm_rld)
224 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
225}
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000226
227int acpi_processor_suspend(struct acpi_device * device, pm_message_t state)
228{
Len Brown815ab0f2009-05-07 22:19:45 -0400229 if (acpi_idle_suspend == 1)
230 return 0;
231
232 acpi_idle_bm_rld_save();
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000233 acpi_idle_suspend = 1;
234 return 0;
235}
236
237int acpi_processor_resume(struct acpi_device * device)
238{
Len Brown815ab0f2009-05-07 22:19:45 -0400239 if (acpi_idle_suspend == 0)
240 return 0;
241
242 acpi_idle_bm_rld_restore();
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000243 acpi_idle_suspend = 0;
244 return 0;
245}
246
Pavel Machek61331162008-02-19 11:00:29 +0100247#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
Len Brown520daf72009-05-14 17:27:38 -0400248static void tsc_check_state(int state)
Andi Kleenddb25f92008-01-30 13:32:41 +0100249{
250 switch (boot_cpu_data.x86_vendor) {
251 case X86_VENDOR_AMD:
Venki Pallipadi40fb1712008-11-17 16:11:37 -0800252 case X86_VENDOR_INTEL:
Andi Kleenddb25f92008-01-30 13:32:41 +0100253 /*
254 * AMD Fam10h TSC will tick in all
255 * C/P/S0/S1 states when this bit is set.
256 */
Venki Pallipadi40fb1712008-11-17 16:11:37 -0800257 if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
Len Brown520daf72009-05-14 17:27:38 -0400258 return;
Venki Pallipadi40fb1712008-11-17 16:11:37 -0800259
Andi Kleenddb25f92008-01-30 13:32:41 +0100260 /*FALL THROUGH*/
Andi Kleenddb25f92008-01-30 13:32:41 +0100261 default:
Len Brown520daf72009-05-14 17:27:38 -0400262 /* TSC could halt in idle, so notify users */
263 if (state > ACPI_STATE_C1)
264 mark_tsc_unstable("TSC halts in idle");
Andi Kleenddb25f92008-01-30 13:32:41 +0100265 }
266}
Len Brown520daf72009-05-14 17:27:38 -0400267#else
268static void tsc_check_state(int state) { return; }
Andi Kleenddb25f92008-01-30 13:32:41 +0100269#endif
270
Len Brown4be44fc2005-08-05 00:44:28 -0400271static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400275 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
277 if (!pr->pblk)
Patrick Mocheld550d982006-06-27 00:41:40 -0400278 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 /* if info is obtained from pblk/fadt, type equals state */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
282 pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
283
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400284#ifndef CONFIG_HOTPLUG_CPU
285 /*
286 * Check for P_LVL2_UP flag before entering C2 and above on
Len Brown4f86d3a2007-10-03 18:58:00 -0400287 * an SMP system.
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400288 */
Alexey Starikovskiyad718602007-02-02 19:48:19 +0300289 if ((num_online_cpus() > 1) &&
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300290 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
Patrick Mocheld550d982006-06-27 00:41:40 -0400291 return -ENODEV;
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400292#endif
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 /* determine C2 and C3 address from pblk */
295 pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
296 pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5;
297
298 /* determine latencies from FADT */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300299 pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency;
300 pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
303 "lvl2[0x%08x] lvl3[0x%08x]\n",
304 pr->power.states[ACPI_STATE_C2].address,
305 pr->power.states[ACPI_STATE_C3].address));
306
Patrick Mocheld550d982006-06-27 00:41:40 -0400307 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308}
309
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700310static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500311{
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700312 if (!pr->power.states[ACPI_STATE_C1].valid) {
313 /* set the first C-State to C1 */
314 /* all processors need to support C1 */
315 pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
316 pr->power.states[ACPI_STATE_C1].valid = 1;
Venkatesh Pallipadi0fda6b42008-04-09 21:31:46 -0400317 pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700318 }
319 /* the C0 state only exists as a filler in our array */
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500320 pr->power.states[ACPI_STATE_C0].valid = 1;
Patrick Mocheld550d982006-06-27 00:41:40 -0400321 return 0;
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500322}
323
Len Brown4be44fc2005-08-05 00:44:28 -0400324static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325{
Len Brown4be44fc2005-08-05 00:44:28 -0400326 acpi_status status = 0;
327 acpi_integer count;
Janosch Machowinskicf824782005-08-20 08:02:00 -0400328 int current_count;
Len Brown4be44fc2005-08-05 00:44:28 -0400329 int i;
330 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
331 union acpi_object *cst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 if (nocst)
Patrick Mocheld550d982006-06-27 00:41:40 -0400335 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700337 current_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer);
340 if (ACPI_FAILURE(status)) {
341 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400342 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400343 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200345 cst = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
347 /* There must be at least 2 elements */
348 if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) {
Len Brown64684632006-06-26 23:41:38 -0400349 printk(KERN_ERR PREFIX "not enough elements in _CST\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 status = -EFAULT;
351 goto end;
352 }
353
354 count = cst->package.elements[0].integer.value;
355
356 /* Validate number of power states. */
357 if (count < 1 || count != cst->package.count - 1) {
Len Brown64684632006-06-26 23:41:38 -0400358 printk(KERN_ERR PREFIX "count given by _CST is not valid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 status = -EFAULT;
360 goto end;
361 }
362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 /* Tell driver that at least _CST is supported. */
364 pr->flags.has_cst = 1;
365
366 for (i = 1; i <= count; i++) {
367 union acpi_object *element;
368 union acpi_object *obj;
369 struct acpi_power_register *reg;
370 struct acpi_processor_cx cx;
371
372 memset(&cx, 0, sizeof(cx));
373
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200374 element = &(cst->package.elements[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 if (element->type != ACPI_TYPE_PACKAGE)
376 continue;
377
378 if (element->package.count != 4)
379 continue;
380
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200381 obj = &(element->package.elements[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
383 if (obj->type != ACPI_TYPE_BUFFER)
384 continue;
385
Len Brown4be44fc2005-08-05 00:44:28 -0400386 reg = (struct acpi_power_register *)obj->buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
388 if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO &&
Len Brown4be44fc2005-08-05 00:44:28 -0400389 (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 continue;
391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 /* There should be an easy way to extract an integer... */
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200393 obj = &(element->package.elements[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 if (obj->type != ACPI_TYPE_INTEGER)
395 continue;
396
397 cx.type = obj->integer.value;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700398 /*
399 * Some buggy BIOSes won't list C1 in _CST -
400 * Let acpi_processor_get_power_info_default() handle them later
401 */
402 if (i == 1 && cx.type != ACPI_STATE_C1)
403 current_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700405 cx.address = reg->address;
406 cx.index = current_count + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800408 cx.entry_method = ACPI_CSTATE_SYSTEMIO;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700409 if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
410 if (acpi_processor_ffh_cstate_probe
411 (pr->id, &cx, reg) == 0) {
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800412 cx.entry_method = ACPI_CSTATE_FFH;
413 } else if (cx.type == ACPI_STATE_C1) {
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700414 /*
415 * C1 is a special case where FIXED_HARDWARE
416 * can be handled in non-MWAIT way as well.
417 * In that case, save this _CST entry info.
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700418 * Otherwise, ignore this info and continue.
419 */
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800420 cx.entry_method = ACPI_CSTATE_HALT;
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800421 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800422 } else {
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700423 continue;
424 }
Zhao Yakuida5e09a2008-06-24 18:01:09 +0800425 if (cx.type == ACPI_STATE_C1 &&
426 (idle_halt || idle_nomwait)) {
Zhao Yakuic1e3b372008-06-24 17:58:53 +0800427 /*
428 * In most cases the C1 space_id obtained from
429 * _CST object is FIXED_HARDWARE access mode.
430 * But when the option of idle=halt is added,
431 * the entry_method type should be changed from
432 * CSTATE_FFH to CSTATE_HALT.
Zhao Yakuida5e09a2008-06-24 18:01:09 +0800433 * When the option of idle=nomwait is added,
434 * the C1 entry_method type should be
435 * CSTATE_HALT.
Zhao Yakuic1e3b372008-06-24 17:58:53 +0800436 */
437 cx.entry_method = ACPI_CSTATE_HALT;
438 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
439 }
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800440 } else {
441 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x",
442 cx.address);
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700443 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Venkatesh Pallipadi0fda6b42008-04-09 21:31:46 -0400445 if (cx.type == ACPI_STATE_C1) {
446 cx.valid = 1;
447 }
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800448
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200449 obj = &(element->package.elements[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 if (obj->type != ACPI_TYPE_INTEGER)
451 continue;
452
453 cx.latency = obj->integer.value;
454
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200455 obj = &(element->package.elements[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 if (obj->type != ACPI_TYPE_INTEGER)
457 continue;
458
459 cx.power = obj->integer.value;
460
Janosch Machowinskicf824782005-08-20 08:02:00 -0400461 current_count++;
462 memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx));
463
464 /*
465 * We support total ACPI_PROCESSOR_MAX_POWER - 1
466 * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1)
467 */
468 if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) {
469 printk(KERN_WARNING
470 "Limiting number of power states to max (%d)\n",
471 ACPI_PROCESSOR_MAX_POWER);
472 printk(KERN_WARNING
473 "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n");
474 break;
475 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 }
477
Len Brown4be44fc2005-08-05 00:44:28 -0400478 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n",
Janosch Machowinskicf824782005-08-20 08:02:00 -0400479 current_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 /* Validate number of power states discovered */
Janosch Machowinskicf824782005-08-20 08:02:00 -0400482 if (current_count < 2)
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -0400483 status = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Len Brown4be44fc2005-08-05 00:44:28 -0400485 end:
Len Brown02438d82006-06-30 03:19:10 -0400486 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
Patrick Mocheld550d982006-06-27 00:41:40 -0400488 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489}
490
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
492{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 if (!cx->address)
Patrick Mocheld550d982006-06-27 00:41:40 -0400495 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
497 /*
498 * C2 latency must be less than or equal to 100
499 * microseconds.
500 */
501 else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
502 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400503 "latency too large [%d]\n", cx->latency));
Patrick Mocheld550d982006-06-27 00:41:40 -0400504 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 }
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 /*
508 * Otherwise we've met all of our C2 requirements.
509 * Normalize the C2 latency to expidite policy
510 */
511 cx->valid = 1;
Len Brown4f86d3a2007-10-03 18:58:00 -0400512
Len Brown4f86d3a2007-10-03 18:58:00 -0400513 cx->latency_ticks = cx->latency;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
Patrick Mocheld550d982006-06-27 00:41:40 -0400515 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516}
517
Len Brown4be44fc2005-08-05 00:44:28 -0400518static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
519 struct acpi_processor_cx *cx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520{
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700521 static int bm_check_flag = -1;
522 static int bm_control_flag = -1;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400523
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
525 if (!cx->address)
Patrick Mocheld550d982006-06-27 00:41:40 -0400526 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
528 /*
529 * C3 latency must be less than or equal to 1000
530 * microseconds.
531 */
532 else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
533 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400534 "latency too large [%d]\n", cx->latency));
Patrick Mocheld550d982006-06-27 00:41:40 -0400535 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 }
537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 /*
539 * PIIX4 Erratum #18: We don't support C3 when Type-F (fast)
540 * DMA transfers are used by any ISA device to avoid livelock.
541 * Note that we could disable Type-F DMA (as recommended by
542 * the erratum), but this is known to disrupt certain ISA
543 * devices thus we take the conservative approach.
544 */
545 else if (errata.piix4.fdma) {
546 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400547 "C3 not supported on PIIX4 with Type-F DMA\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400548 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 }
550
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400551 /* All the logic here assumes flags.bm_check is same across all CPUs */
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700552 if (bm_check_flag == -1) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400553 /* Determine whether bm_check is needed based on CPU */
554 acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
555 bm_check_flag = pr->flags.bm_check;
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700556 bm_control_flag = pr->flags.bm_control;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400557 } else {
558 pr->flags.bm_check = bm_check_flag;
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700559 pr->flags.bm_control = bm_control_flag;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400560 }
561
562 if (pr->flags.bm_check) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400563 if (!pr->flags.bm_control) {
Venki Pallipadied3110e2007-07-31 12:04:31 -0700564 if (pr->flags.has_cst != 1) {
565 /* bus mastering control is necessary */
566 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
567 "C3 support requires BM control\n"));
568 return;
569 } else {
570 /* Here we enter C3 without bus mastering */
571 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
572 "C3 support without BM control\n"));
573 }
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400574 }
575 } else {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400576 /*
577 * WBINVD should be set in fadt, for C3 state to be
578 * supported on when bm_check is not required.
579 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300580 if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400581 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400582 "Cache invalidation should work properly"
583 " for C3 to be enabled on SMP systems\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400584 return;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400585 }
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400586 }
587
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 /*
589 * Otherwise we've met all of our C3 requirements.
590 * Normalize the C3 latency to expidite policy. Enable
591 * checking of bus mastering status (bm_check) so we can
592 * use this in our C3 policy
593 */
594 cx->valid = 1;
Len Brown4f86d3a2007-10-03 18:58:00 -0400595
Len Brown4f86d3a2007-10-03 18:58:00 -0400596 cx->latency_ticks = cx->latency;
Len Brown31878dd2009-01-28 18:28:09 -0500597 /*
598 * On older chipsets, BM_RLD needs to be set
599 * in order for Bus Master activity to wake the
600 * system from C3. Newer chipsets handle DMA
601 * during C3 automatically and BM_RLD is a NOP.
602 * In either case, the proper way to
603 * handle BM_RLD is to set it and leave it set.
604 */
Bob Moore50ffba12009-02-23 15:02:07 +0800605 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
Patrick Mocheld550d982006-06-27 00:41:40 -0400607 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608}
609
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610static int acpi_processor_power_verify(struct acpi_processor *pr)
611{
612 unsigned int i;
613 unsigned int working = 0;
Venkatesh Pallipadi6eb0a0f2006-01-11 22:44:21 +0100614
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800615 pr->power.timer_broadcast_on_state = INT_MAX;
Venkatesh Pallipadi6eb0a0f2006-01-11 22:44:21 +0100616
Len Browna0bf2842009-05-15 01:29:31 -0400617 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 struct acpi_processor_cx *cx = &pr->power.states[i];
619
620 switch (cx->type) {
621 case ACPI_STATE_C1:
622 cx->valid = 1;
623 break;
624
625 case ACPI_STATE_C2:
626 acpi_processor_power_verify_c2(cx);
627 break;
628
629 case ACPI_STATE_C3:
630 acpi_processor_power_verify_c3(pr, cx);
631 break;
632 }
Len Brown7e275cc2009-05-15 02:08:44 -0400633 if (!cx->valid)
634 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
Len Brown7e275cc2009-05-15 02:08:44 -0400636 lapic_timer_check_state(i, pr, cx);
637 tsc_check_state(cx->type);
638 working++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 }
640
Suresh Siddhaf833bab2009-08-17 14:34:59 -0700641 smp_call_function_single(pr->id, lapic_timer_propagate_broadcast,
642 pr, 1);
Andi Kleenbd663342006-03-25 16:31:07 +0100643
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 return (working);
645}
646
Len Brown4be44fc2005-08-05 00:44:28 -0400647static int acpi_processor_get_power_info(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648{
649 unsigned int i;
650 int result;
651
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
653 /* NOTE: the idle thread may not be running while calling
654 * this function */
655
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700656 /* Zero initialize all the C-states info. */
657 memset(pr->power.states, 0, sizeof(pr->power.states));
658
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 result = acpi_processor_get_power_info_cst(pr);
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -0400660 if (result == -ENODEV)
Darrick J. Wongc5a114f2006-10-19 23:28:28 -0700661 result = acpi_processor_get_power_info_fadt(pr);
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -0400662
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700663 if (result)
664 return result;
665
666 acpi_processor_get_power_info_default(pr);
667
Janosch Machowinskicf824782005-08-20 08:02:00 -0400668 pr->power.count = acpi_processor_power_verify(pr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 /*
671 * if one state of type C2 or C3 is available, mark this
672 * CPU as being "idle manageable"
673 */
674 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500675 if (pr->power.states[i].valid) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 pr->power.count = i;
Linus Torvalds2203d6e2005-11-18 07:29:51 -0800677 if (pr->power.states[i].type >= ACPI_STATE_C2)
678 pr->flags.power = 1;
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500679 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 }
681
Patrick Mocheld550d982006-06-27 00:41:40 -0400682 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683}
684
Zhao Yakui74cad4e2009-06-24 11:49:49 +0800685#ifdef CONFIG_ACPI_PROCFS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
687{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200688 struct acpi_processor *pr = seq->private;
Len Brown4be44fc2005-08-05 00:44:28 -0400689 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
692 if (!pr)
693 goto end;
694
695 seq_printf(seq, "active state: C%zd\n"
Len Brown4be44fc2005-08-05 00:44:28 -0400696 "max_cstate: C%d\n"
Arjan van de Ven5c875792006-09-30 23:27:17 -0700697 "maximum allowed latency: %d usec\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400698 pr->power.state ? pr->power.state - pr->power.states : 0,
Len Brown92614612009-04-22 19:28:15 -0400699 max_cstate, pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
701 seq_puts(seq, "states:\n");
702
703 for (i = 1; i <= pr->power.count; i++) {
704 seq_printf(seq, " %cC%d: ",
Len Brown4be44fc2005-08-05 00:44:28 -0400705 (&pr->power.states[i] ==
706 pr->power.state ? '*' : ' '), i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
708 if (!pr->power.states[i].valid) {
709 seq_puts(seq, "<not supported>\n");
710 continue;
711 }
712
713 switch (pr->power.states[i].type) {
714 case ACPI_STATE_C1:
715 seq_printf(seq, "type[C1] ");
716 break;
717 case ACPI_STATE_C2:
718 seq_printf(seq, "type[C2] ");
719 break;
720 case ACPI_STATE_C3:
721 seq_printf(seq, "type[C3] ");
722 break;
723 default:
724 seq_printf(seq, "type[--] ");
725 break;
726 }
727
728 if (pr->power.states[i].promotion.state)
729 seq_printf(seq, "promotion[C%zd] ",
Len Brown4be44fc2005-08-05 00:44:28 -0400730 (pr->power.states[i].promotion.state -
731 pr->power.states));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 else
733 seq_puts(seq, "promotion[--] ");
734
735 if (pr->power.states[i].demotion.state)
736 seq_printf(seq, "demotion[C%zd] ",
Len Brown4be44fc2005-08-05 00:44:28 -0400737 (pr->power.states[i].demotion.state -
738 pr->power.states));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 else
740 seq_puts(seq, "demotion[--] ");
741
Dominik Brodowskia3c65982006-06-24 19:37:00 -0400742 seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400743 pr->power.states[i].latency,
Dominik Brodowskia3c65982006-06-24 19:37:00 -0400744 pr->power.states[i].usage,
Alexey Starikovskiyb0b7eaa2007-01-25 22:39:44 -0500745 (unsigned long long)pr->power.states[i].time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 }
747
Len Brown4be44fc2005-08-05 00:44:28 -0400748 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400749 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750}
751
752static int acpi_processor_power_open_fs(struct inode *inode, struct file *file)
753{
754 return single_open(file, acpi_processor_power_seq_show,
Len Brown4be44fc2005-08-05 00:44:28 -0400755 PDE(inode)->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756}
757
Arjan van de Vend7508032006-07-04 13:06:00 -0400758static const struct file_operations acpi_processor_power_fops = {
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700759 .owner = THIS_MODULE,
Len Brown4be44fc2005-08-05 00:44:28 -0400760 .open = acpi_processor_power_open_fs,
761 .read = seq_read,
762 .llseek = seq_lseek,
763 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764};
Zhao Yakui74cad4e2009-06-24 11:49:49 +0800765#endif
Len Brown4f86d3a2007-10-03 18:58:00 -0400766
767/**
768 * acpi_idle_bm_check - checks if bus master activity was detected
769 */
770static int acpi_idle_bm_check(void)
771{
772 u32 bm_status = 0;
773
Bob Moore50ffba12009-02-23 15:02:07 +0800774 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
Len Brown4f86d3a2007-10-03 18:58:00 -0400775 if (bm_status)
Bob Moore50ffba12009-02-23 15:02:07 +0800776 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
Len Brown4f86d3a2007-10-03 18:58:00 -0400777 /*
778 * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
779 * the true state of bus mastering activity; forcing us to
780 * manually check the BMIDEA bit of each IDE channel.
781 */
782 else if (errata.piix4.bmisx) {
783 if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
784 || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
785 bm_status = 1;
786 }
787 return bm_status;
788}
789
790/**
Len Brown4f86d3a2007-10-03 18:58:00 -0400791 * acpi_idle_do_entry - a helper function that does C2 and C3 type entry
792 * @cx: cstate data
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800793 *
794 * Caller disables interrupt before call and enables interrupt after return.
Len Brown4f86d3a2007-10-03 18:58:00 -0400795 */
796static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
797{
Steven Rostedtdcf30992008-07-25 18:00:42 -0400798 /* Don't trace irqs off for idle */
799 stop_critical_timings();
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800800 if (cx->entry_method == ACPI_CSTATE_FFH) {
Len Brown4f86d3a2007-10-03 18:58:00 -0400801 /* Call into architectural FFH based C-state */
802 acpi_processor_ffh_cstate_enter(cx);
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800803 } else if (cx->entry_method == ACPI_CSTATE_HALT) {
804 acpi_safe_halt();
Len Brown4f86d3a2007-10-03 18:58:00 -0400805 } else {
806 int unused;
807 /* IO port based C-state */
808 inb(cx->address);
809 /* Dummy wait op - must do something useless after P_LVL2 read
810 because chipsets cannot guarantee that STPCLK# signal
811 gets asserted in time to freeze execution properly. */
812 unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
813 }
Steven Rostedtdcf30992008-07-25 18:00:42 -0400814 start_critical_timings();
Len Brown4f86d3a2007-10-03 18:58:00 -0400815}
816
817/**
818 * acpi_idle_enter_c1 - enters an ACPI C1 state-type
819 * @dev: the target CPU
820 * @state: the state data
821 *
822 * This is equivalent to the HALT instruction.
823 */
824static int acpi_idle_enter_c1(struct cpuidle_device *dev,
825 struct cpuidle_state *state)
826{
alex.shiff69f2b2009-03-04 11:55:26 -0800827 ktime_t kt1, kt2;
828 s64 idle_time;
Len Brown4f86d3a2007-10-03 18:58:00 -0400829 struct acpi_processor *pr;
830 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
venkatesh.pallipadi@intel.com9b12e182008-01-31 17:35:05 -0800831
Mike Travis706546d2008-06-09 16:22:23 -0700832 pr = __get_cpu_var(processors);
Len Brown4f86d3a2007-10-03 18:58:00 -0400833
834 if (unlikely(!pr))
835 return 0;
836
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800837 local_irq_disable();
Venkatesh Pallipadib077fba2008-02-11 15:20:27 -0800838
839 /* Do not access any ACPI IO ports in suspend path */
840 if (acpi_idle_suspend) {
Venkatesh Pallipadib077fba2008-02-11 15:20:27 -0800841 local_irq_enable();
Shaohua Li7d60e8a2009-05-19 16:09:54 +0800842 cpu_relax();
Venkatesh Pallipadib077fba2008-02-11 15:20:27 -0800843 return 0;
844 }
845
Len Brown7e275cc2009-05-15 02:08:44 -0400846 lapic_timer_state_broadcast(pr, cx, 1);
alex.shiff69f2b2009-03-04 11:55:26 -0800847 kt1 = ktime_get_real();
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800848 acpi_idle_do_entry(cx);
alex.shiff69f2b2009-03-04 11:55:26 -0800849 kt2 = ktime_get_real();
850 idle_time = ktime_to_us(ktime_sub(kt2, kt1));
Len Brown4f86d3a2007-10-03 18:58:00 -0400851
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800852 local_irq_enable();
Len Brown4f86d3a2007-10-03 18:58:00 -0400853 cx->usage++;
Len Brown7e275cc2009-05-15 02:08:44 -0400854 lapic_timer_state_broadcast(pr, cx, 0);
Len Brown4f86d3a2007-10-03 18:58:00 -0400855
alex.shiff69f2b2009-03-04 11:55:26 -0800856 return idle_time;
Len Brown4f86d3a2007-10-03 18:58:00 -0400857}
858
859/**
860 * acpi_idle_enter_simple - enters an ACPI state without BM handling
861 * @dev: the target CPU
862 * @state: the state data
863 */
864static int acpi_idle_enter_simple(struct cpuidle_device *dev,
865 struct cpuidle_state *state)
866{
867 struct acpi_processor *pr;
868 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
alex.shiff69f2b2009-03-04 11:55:26 -0800869 ktime_t kt1, kt2;
870 s64 idle_time;
871 s64 sleep_ticks = 0;
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500872
Mike Travis706546d2008-06-09 16:22:23 -0700873 pr = __get_cpu_var(processors);
Len Brown4f86d3a2007-10-03 18:58:00 -0400874
875 if (unlikely(!pr))
876 return 0;
877
Len Browne1964412007-10-04 01:23:47 -0400878 if (acpi_idle_suspend)
879 return(acpi_idle_enter_c1(dev, state));
880
Len Brown4f86d3a2007-10-03 18:58:00 -0400881 local_irq_disable();
882 current_thread_info()->status &= ~TS_POLLING;
883 /*
884 * TS_POLLING-cleared state must be visible before we test
885 * NEED_RESCHED:
886 */
887 smp_mb();
888
889 if (unlikely(need_resched())) {
890 current_thread_info()->status |= TS_POLLING;
891 local_irq_enable();
892 return 0;
893 }
894
Thomas Gleixnere17bcb42007-12-07 19:16:17 +0100895 /*
896 * Must be done before busmaster disable as we might need to
897 * access HPET !
898 */
Len Brown7e275cc2009-05-15 02:08:44 -0400899 lapic_timer_state_broadcast(pr, cx, 1);
Thomas Gleixnere17bcb42007-12-07 19:16:17 +0100900
Len Brown4f86d3a2007-10-03 18:58:00 -0400901 if (cx->type == ACPI_STATE_C3)
902 ACPI_FLUSH_CPU_CACHE();
903
alex.shiff69f2b2009-03-04 11:55:26 -0800904 kt1 = ktime_get_real();
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500905 /* Tell the scheduler that we are going deep-idle: */
906 sched_clock_idle_sleep_event();
Len Brown4f86d3a2007-10-03 18:58:00 -0400907 acpi_idle_do_entry(cx);
alex.shiff69f2b2009-03-04 11:55:26 -0800908 kt2 = ktime_get_real();
909 idle_time = ktime_to_us(ktime_sub(kt2, kt1));
Len Brown4f86d3a2007-10-03 18:58:00 -0400910
alex.shiff69f2b2009-03-04 11:55:26 -0800911 sleep_ticks = us_to_pm_timer_ticks(idle_time);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500912
913 /* Tell the scheduler how much we idled: */
914 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
Len Brown4f86d3a2007-10-03 18:58:00 -0400915
916 local_irq_enable();
917 current_thread_info()->status |= TS_POLLING;
918
919 cx->usage++;
920
Len Brown7e275cc2009-05-15 02:08:44 -0400921 lapic_timer_state_broadcast(pr, cx, 0);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500922 cx->time += sleep_ticks;
alex.shiff69f2b2009-03-04 11:55:26 -0800923 return idle_time;
Len Brown4f86d3a2007-10-03 18:58:00 -0400924}
925
926static int c3_cpu_count;
927static DEFINE_SPINLOCK(c3_lock);
928
929/**
930 * acpi_idle_enter_bm - enters C3 with proper BM handling
931 * @dev: the target CPU
932 * @state: the state data
933 *
934 * If BM is detected, the deepest non-C3 idle state is entered instead.
935 */
936static int acpi_idle_enter_bm(struct cpuidle_device *dev,
937 struct cpuidle_state *state)
938{
939 struct acpi_processor *pr;
940 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
alex.shiff69f2b2009-03-04 11:55:26 -0800941 ktime_t kt1, kt2;
942 s64 idle_time;
943 s64 sleep_ticks = 0;
944
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500945
Mike Travis706546d2008-06-09 16:22:23 -0700946 pr = __get_cpu_var(processors);
Len Brown4f86d3a2007-10-03 18:58:00 -0400947
948 if (unlikely(!pr))
949 return 0;
950
Len Browne1964412007-10-04 01:23:47 -0400951 if (acpi_idle_suspend)
952 return(acpi_idle_enter_c1(dev, state));
953
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500954 if (acpi_idle_bm_check()) {
955 if (dev->safe_state) {
Venkatesh Pallipadiaddbad42008-09-29 15:24:28 -0700956 dev->last_state = dev->safe_state;
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500957 return dev->safe_state->enter(dev, dev->safe_state);
958 } else {
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800959 local_irq_disable();
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500960 acpi_safe_halt();
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800961 local_irq_enable();
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500962 return 0;
963 }
964 }
965
Len Brown4f86d3a2007-10-03 18:58:00 -0400966 local_irq_disable();
967 current_thread_info()->status &= ~TS_POLLING;
968 /*
969 * TS_POLLING-cleared state must be visible before we test
970 * NEED_RESCHED:
971 */
972 smp_mb();
973
974 if (unlikely(need_resched())) {
975 current_thread_info()->status |= TS_POLLING;
976 local_irq_enable();
977 return 0;
978 }
979
Venki Pallipadi996520c2008-03-24 14:24:10 -0700980 acpi_unlazy_tlb(smp_processor_id());
981
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500982 /* Tell the scheduler that we are going deep-idle: */
983 sched_clock_idle_sleep_event();
Len Brown4f86d3a2007-10-03 18:58:00 -0400984 /*
985 * Must be done before busmaster disable as we might need to
986 * access HPET !
987 */
Len Brown7e275cc2009-05-15 02:08:44 -0400988 lapic_timer_state_broadcast(pr, cx, 1);
Len Brown4f86d3a2007-10-03 18:58:00 -0400989
Len Brownf461dde2009-04-23 18:59:43 -0400990 kt1 = ktime_get_real();
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500991 /*
992 * disable bus master
993 * bm_check implies we need ARB_DIS
994 * !bm_check implies we need cache flush
995 * bm_control implies whether we can do ARB_DIS
996 *
997 * That leaves a case where bm_check is set and bm_control is
998 * not set. In that case we cannot do much, we enter C3
999 * without doing anything.
1000 */
1001 if (pr->flags.bm_check && pr->flags.bm_control) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001002 spin_lock(&c3_lock);
1003 c3_cpu_count++;
1004 /* Disable bus master arbitration when all CPUs are in C3 */
1005 if (c3_cpu_count == num_online_cpus())
Bob Moore50ffba12009-02-23 15:02:07 +08001006 acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
Len Brown4f86d3a2007-10-03 18:58:00 -04001007 spin_unlock(&c3_lock);
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001008 } else if (!pr->flags.bm_check) {
1009 ACPI_FLUSH_CPU_CACHE();
1010 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001011
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001012 acpi_idle_do_entry(cx);
Len Brown4f86d3a2007-10-03 18:58:00 -04001013
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001014 /* Re-enable bus master arbitration */
1015 if (pr->flags.bm_check && pr->flags.bm_control) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001016 spin_lock(&c3_lock);
Bob Moore50ffba12009-02-23 15:02:07 +08001017 acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
Len Brown4f86d3a2007-10-03 18:58:00 -04001018 c3_cpu_count--;
1019 spin_unlock(&c3_lock);
1020 }
Len Brownf461dde2009-04-23 18:59:43 -04001021 kt2 = ktime_get_real();
1022 idle_time = ktime_to_us(ktime_sub(kt2, kt1));
Len Brown4f86d3a2007-10-03 18:58:00 -04001023
alex.shiff69f2b2009-03-04 11:55:26 -08001024 sleep_ticks = us_to_pm_timer_ticks(idle_time);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001025 /* Tell the scheduler how much we idled: */
1026 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
Len Brown4f86d3a2007-10-03 18:58:00 -04001027
1028 local_irq_enable();
1029 current_thread_info()->status |= TS_POLLING;
1030
1031 cx->usage++;
1032
Len Brown7e275cc2009-05-15 02:08:44 -04001033 lapic_timer_state_broadcast(pr, cx, 0);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001034 cx->time += sleep_ticks;
alex.shiff69f2b2009-03-04 11:55:26 -08001035 return idle_time;
Len Brown4f86d3a2007-10-03 18:58:00 -04001036}
1037
1038struct cpuidle_driver acpi_idle_driver = {
1039 .name = "acpi_idle",
1040 .owner = THIS_MODULE,
1041};
1042
1043/**
1044 * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE
1045 * @pr: the ACPI processor
1046 */
1047static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
1048{
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -08001049 int i, count = CPUIDLE_DRIVER_STATE_START;
Len Brown4f86d3a2007-10-03 18:58:00 -04001050 struct acpi_processor_cx *cx;
1051 struct cpuidle_state *state;
1052 struct cpuidle_device *dev = &pr->power.dev;
1053
1054 if (!pr->flags.power_setup_done)
1055 return -EINVAL;
1056
1057 if (pr->flags.power == 0) {
1058 return -EINVAL;
1059 }
1060
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001061 dev->cpu = pr->id;
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -08001062 for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
1063 dev->states[i].name[0] = '\0';
1064 dev->states[i].desc[0] = '\0';
1065 }
1066
Len Brown615dfd92009-04-23 23:21:29 -04001067 if (max_cstate == 0)
1068 max_cstate = 1;
1069
Len Brown4f86d3a2007-10-03 18:58:00 -04001070 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
1071 cx = &pr->power.states[i];
1072 state = &dev->states[count];
1073
1074 if (!cx->valid)
1075 continue;
1076
1077#ifdef CONFIG_HOTPLUG_CPU
1078 if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
1079 !pr->flags.has_cst &&
1080 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
1081 continue;
1082#endif
1083 cpuidle_set_statedata(state, cx);
1084
1085 snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -08001086 strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
Len Brown4f86d3a2007-10-03 18:58:00 -04001087 state->exit_latency = cx->latency;
Len Brown4963f622007-12-13 23:50:45 -05001088 state->target_residency = cx->latency * latency_factor;
Len Brown4f86d3a2007-10-03 18:58:00 -04001089 state->power_usage = cx->power;
1090
1091 state->flags = 0;
1092 switch (cx->type) {
1093 case ACPI_STATE_C1:
1094 state->flags |= CPUIDLE_FLAG_SHALLOW;
Venki Pallipadi8e92b662008-02-29 10:24:32 -08001095 if (cx->entry_method == ACPI_CSTATE_FFH)
1096 state->flags |= CPUIDLE_FLAG_TIME_VALID;
1097
Len Brown4f86d3a2007-10-03 18:58:00 -04001098 state->enter = acpi_idle_enter_c1;
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001099 dev->safe_state = state;
Len Brown4f86d3a2007-10-03 18:58:00 -04001100 break;
1101
1102 case ACPI_STATE_C2:
1103 state->flags |= CPUIDLE_FLAG_BALANCED;
1104 state->flags |= CPUIDLE_FLAG_TIME_VALID;
1105 state->enter = acpi_idle_enter_simple;
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001106 dev->safe_state = state;
Len Brown4f86d3a2007-10-03 18:58:00 -04001107 break;
1108
1109 case ACPI_STATE_C3:
1110 state->flags |= CPUIDLE_FLAG_DEEP;
1111 state->flags |= CPUIDLE_FLAG_TIME_VALID;
1112 state->flags |= CPUIDLE_FLAG_CHECK_BM;
1113 state->enter = pr->flags.bm_check ?
1114 acpi_idle_enter_bm :
1115 acpi_idle_enter_simple;
1116 break;
1117 }
1118
1119 count++;
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -08001120 if (count == CPUIDLE_STATE_MAX)
1121 break;
Len Brown4f86d3a2007-10-03 18:58:00 -04001122 }
1123
1124 dev->state_count = count;
1125
1126 if (!count)
1127 return -EINVAL;
1128
Len Brown4f86d3a2007-10-03 18:58:00 -04001129 return 0;
1130}
1131
1132int acpi_processor_cst_has_changed(struct acpi_processor *pr)
1133{
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001134 int ret = 0;
Len Brown4f86d3a2007-10-03 18:58:00 -04001135
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001136 if (boot_option_idle_override)
1137 return 0;
1138
Len Brown4f86d3a2007-10-03 18:58:00 -04001139 if (!pr)
1140 return -EINVAL;
1141
1142 if (nocst) {
1143 return -ENODEV;
1144 }
1145
1146 if (!pr->flags.power_setup_done)
1147 return -ENODEV;
1148
1149 cpuidle_pause_and_lock();
1150 cpuidle_disable_device(&pr->power.dev);
1151 acpi_processor_get_power_info(pr);
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001152 if (pr->flags.power) {
1153 acpi_processor_setup_cpuidle(pr);
1154 ret = cpuidle_enable_device(&pr->power.dev);
1155 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001156 cpuidle_resume_and_unlock();
1157
1158 return ret;
1159}
1160
Pierre Ossman7af8b662006-10-10 14:20:31 -07001161int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
Len Brown4be44fc2005-08-05 00:44:28 -04001162 struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163{
Len Brown4be44fc2005-08-05 00:44:28 -04001164 acpi_status status = 0;
Andreas Mohrb6835052006-04-27 05:25:00 -04001165 static int first_run;
Len Brownb188e4c2009-06-24 01:48:32 -04001166#ifdef CONFIG_ACPI_PROCFS
Len Brown4be44fc2005-08-05 00:44:28 -04001167 struct proc_dir_entry *entry = NULL;
Len Brownb188e4c2009-06-24 01:48:32 -04001168#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001170 if (boot_option_idle_override)
1171 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
1173 if (!first_run) {
Zhao Yakuic1e3b372008-06-24 17:58:53 +08001174 if (idle_halt) {
1175 /*
1176 * When the boot option of "idle=halt" is added, halt
1177 * is used for CPU IDLE.
1178 * In such case C2/C3 is meaningless. So the max_cstate
1179 * is set to one.
1180 */
1181 max_cstate = 1;
1182 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 dmi_check_system(processor_power_dmi_table);
Alexey Starikovskiyc1c30632007-11-26 20:42:19 +01001184 max_cstate = acpi_processor_cstate_check(max_cstate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 if (max_cstate < ACPI_C_STATES_MAX)
Len Brown4be44fc2005-08-05 00:44:28 -04001186 printk(KERN_NOTICE
1187 "ACPI: processor limited to max C-state %d\n",
1188 max_cstate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 first_run++;
1190 }
1191
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001192 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -04001193 return -EINVAL;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001194
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001195 if (acpi_gbl_FADT.cst_control && !nocst) {
Len Brown4be44fc2005-08-05 00:44:28 -04001196 status =
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001197 acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001199 ACPI_EXCEPTION((AE_INFO, status,
1200 "Notifying BIOS of _CST ability failed"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 }
1202 }
1203
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 acpi_processor_get_power_info(pr);
Len Brown4f86d3a2007-10-03 18:58:00 -04001205 pr->flags.power_setup_done = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206
1207 /*
1208 * Install the idle handler if processor power management is supported.
1209 * Note that we use previously set idle handler will be used on
1210 * platforms that only support C1.
1211 */
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001212 if (pr->flags.power) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001213 acpi_processor_setup_cpuidle(pr);
Len Brown4f86d3a2007-10-03 18:58:00 -04001214 if (cpuidle_register_device(&pr->power.dev))
1215 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 }
Zhao Yakui74cad4e2009-06-24 11:49:49 +08001217#ifdef CONFIG_ACPI_PROCFS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 /* 'power' [R] */
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -07001219 entry = proc_create_data(ACPI_PROCESSOR_FILE_POWER,
1220 S_IRUGO, acpi_device_dir(device),
1221 &acpi_processor_power_fops,
1222 acpi_driver_data(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 if (!entry)
Thomas Renningera6fc6722006-06-26 23:58:43 -04001224 return -EIO;
Zhao Yakui74cad4e2009-06-24 11:49:49 +08001225#endif
Patrick Mocheld550d982006-06-27 00:41:40 -04001226 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227}
1228
Len Brown4be44fc2005-08-05 00:44:28 -04001229int acpi_processor_power_exit(struct acpi_processor *pr,
1230 struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231{
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001232 if (boot_option_idle_override)
1233 return 0;
1234
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001235 cpuidle_unregister_device(&pr->power.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 pr->flags.power_setup_done = 0;
1237
Zhao Yakui74cad4e2009-06-24 11:49:49 +08001238#ifdef CONFIG_ACPI_PROCFS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 if (acpi_device_dir(device))
Len Brown4be44fc2005-08-05 00:44:28 -04001240 remove_proc_entry(ACPI_PROCESSOR_FILE_POWER,
1241 acpi_device_dir(device));
Zhao Yakui74cad4e2009-06-24 11:49:49 +08001242#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243
Patrick Mocheld550d982006-06-27 00:41:40 -04001244 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245}