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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#define ACPI_PROCESSOR_CLASS "processor"
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#define _COMPONENT ACPI_PROCESSOR_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050065ACPI_MODULE_NAME("processor_idle");
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#define ACPI_PROCESSOR_FILE_POWER "power"
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#define C2_OVERHEAD 1 /* 1us */
69#define C3_OVERHEAD 1 /* 1us */
Len Brown4f86d3a2007-10-03 18:58:00 -040070#define PM_TIMER_TICKS_TO_US(p) (((p) * 1000)/(PM_TIMER_FREQUENCY/1000))
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Len Brown4f86d3a2007-10-03 18:58:00 -040072static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
73module_param(max_cstate, uint, 0000);
Andreas Mohrb6835052006-04-27 05:25:00 -040074static unsigned int nocst __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075module_param(nocst, uint, 0000);
76
Len Brown25de5712007-12-14 00:24:15 -050077static unsigned int latency_factor __read_mostly = 2;
Len Brown4963f622007-12-13 23:50:45 -050078module_param(latency_factor, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
alex.shiff69f2b2009-03-04 11:55:26 -080080static s64 us_to_pm_timer_ticks(s64 t)
81{
82 return div64_u64(t * PM_TIMER_FREQUENCY, 1000000);
83}
Linus Torvalds1da177e2005-04-16 15:20:36 -070084/*
85 * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
86 * For now disable this. Probably a bug somewhere else.
87 *
88 * To skip this limit, boot/load with a large max_cstate limit.
89 */
Jeff Garzik18552562007-10-03 15:15:40 -040090static int set_max_cstate(const struct dmi_system_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
92 if (max_cstate > ACPI_PROCESSOR_MAX_POWER)
93 return 0;
94
Len Brown3d356002005-08-03 00:22:52 -040095 printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate."
Len Brown4be44fc2005-08-05 00:44:28 -040096 " Override with \"processor.max_cstate=%d\"\n", id->ident,
97 (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Len Brown3d356002005-08-03 00:22:52 -040099 max_cstate = (long)id->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 return 0;
102}
103
Ashok Raj7ded5682006-02-03 21:51:23 +0100104/* Actually this shouldn't be __cpuinitdata, would be better to fix the
105 callers to only run once -AK */
106static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = {
Thomas Rosner876c1842006-01-06 01:31:00 -0500107 { set_max_cstate, "Clevo 5600D", {
108 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
109 DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")},
Len Brown4be44fc2005-08-05 00:44:28 -0400110 (void *)2},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 {},
112};
113
Len Brown4f86d3a2007-10-03 18:58:00 -0400114
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800115/*
116 * Callers should disable interrupts before the call and enable
117 * interrupts after return.
118 */
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500119static void acpi_safe_halt(void)
120{
121 current_thread_info()->status &= ~TS_POLLING;
122 /*
123 * TS_POLLING-cleared state must be visible before we
124 * test NEED_RESCHED:
125 */
126 smp_mb();
Venki Pallipadi71e93d12008-03-13 17:18:19 -0700127 if (!need_resched()) {
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500128 safe_halt();
Venki Pallipadi71e93d12008-03-13 17:18:19 -0700129 local_irq_disable();
130 }
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500131 current_thread_info()->status |= TS_POLLING;
132}
133
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800134#ifdef ARCH_APICTIMER_STOPS_ON_C3
135
136/*
137 * Some BIOS implementations switch to C3 in the published C2 state.
Linus Torvalds296d93c2007-03-23 08:03:47 -0700138 * This seems to be a common problem on AMD boxen, but other vendors
139 * are affected too. We pick the most conservative approach: we assume
140 * that the local APIC stops in both C2 and C3.
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800141 */
Len Brown7e275cc2009-05-15 02:08:44 -0400142static void lapic_timer_check_state(int state, struct acpi_processor *pr,
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800143 struct acpi_processor_cx *cx)
144{
145 struct acpi_processor_power *pwr = &pr->power;
Thomas Gleixnere585bef2007-03-23 16:08:01 +0100146 u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2;
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800147
Venkatesh Pallipadidb954b52009-04-06 18:51:29 -0700148 if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT))
149 return;
150
Shaohua Li87ad57b2009-05-19 16:09:42 +0800151 if (boot_cpu_has(X86_FEATURE_AMDC1E))
152 type = ACPI_STATE_C1;
153
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800154 /*
155 * Check, if one of the previous states already marked the lapic
156 * unstable
157 */
158 if (pwr->timer_broadcast_on_state < state)
159 return;
160
Thomas Gleixnere585bef2007-03-23 16:08:01 +0100161 if (cx->type >= type)
Linus Torvalds296d93c2007-03-23 08:03:47 -0700162 pr->power.timer_broadcast_on_state = state;
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800163}
164
Len Brown7e275cc2009-05-15 02:08:44 -0400165static void lapic_timer_propagate_broadcast(struct acpi_processor *pr)
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800166{
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800167 unsigned long reason;
168
169 reason = pr->power.timer_broadcast_on_state < INT_MAX ?
170 CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF;
171
172 clockevents_notify(reason, &pr->id);
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800173}
174
175/* Power(C) State timer broadcast control */
Len Brown7e275cc2009-05-15 02:08:44 -0400176static void lapic_timer_state_broadcast(struct acpi_processor *pr,
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800177 struct acpi_processor_cx *cx,
178 int broadcast)
179{
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800180 int state = cx - pr->power.states;
181
182 if (state >= pr->power.timer_broadcast_on_state) {
183 unsigned long reason;
184
185 reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER :
186 CLOCK_EVT_NOTIFY_BROADCAST_EXIT;
187 clockevents_notify(reason, &pr->id);
188 }
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800189}
190
191#else
192
Len Brown7e275cc2009-05-15 02:08:44 -0400193static void lapic_timer_check_state(int state, struct acpi_processor *pr,
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800194 struct acpi_processor_cx *cstate) { }
Len Brown7e275cc2009-05-15 02:08:44 -0400195static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { }
196static void lapic_timer_state_broadcast(struct acpi_processor *pr,
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800197 struct acpi_processor_cx *cx,
198 int broadcast)
199{
200}
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800201
202#endif
203
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000204/*
205 * Suspend / resume control
206 */
207static int acpi_idle_suspend;
Len Brown815ab0f2009-05-07 22:19:45 -0400208static u32 saved_bm_rld;
209
210static void acpi_idle_bm_rld_save(void)
211{
212 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
213}
214static void acpi_idle_bm_rld_restore(void)
215{
216 u32 resumed_bm_rld;
217
218 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
219
220 if (resumed_bm_rld != saved_bm_rld)
221 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
222}
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000223
224int acpi_processor_suspend(struct acpi_device * device, pm_message_t state)
225{
Len Brown815ab0f2009-05-07 22:19:45 -0400226 if (acpi_idle_suspend == 1)
227 return 0;
228
229 acpi_idle_bm_rld_save();
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000230 acpi_idle_suspend = 1;
231 return 0;
232}
233
234int acpi_processor_resume(struct acpi_device * device)
235{
Len Brown815ab0f2009-05-07 22:19:45 -0400236 if (acpi_idle_suspend == 0)
237 return 0;
238
239 acpi_idle_bm_rld_restore();
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000240 acpi_idle_suspend = 0;
241 return 0;
242}
243
Pavel Machek61331162008-02-19 11:00:29 +0100244#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
Len Brown520daf72009-05-14 17:27:38 -0400245static void tsc_check_state(int state)
Andi Kleenddb25f92008-01-30 13:32:41 +0100246{
247 switch (boot_cpu_data.x86_vendor) {
248 case X86_VENDOR_AMD:
Venki Pallipadi40fb1712008-11-17 16:11:37 -0800249 case X86_VENDOR_INTEL:
Andi Kleenddb25f92008-01-30 13:32:41 +0100250 /*
251 * AMD Fam10h TSC will tick in all
252 * C/P/S0/S1 states when this bit is set.
253 */
Venki Pallipadi40fb1712008-11-17 16:11:37 -0800254 if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
Len Brown520daf72009-05-14 17:27:38 -0400255 return;
Venki Pallipadi40fb1712008-11-17 16:11:37 -0800256
Andi Kleenddb25f92008-01-30 13:32:41 +0100257 /*FALL THROUGH*/
Andi Kleenddb25f92008-01-30 13:32:41 +0100258 default:
Len Brown520daf72009-05-14 17:27:38 -0400259 /* TSC could halt in idle, so notify users */
260 if (state > ACPI_STATE_C1)
261 mark_tsc_unstable("TSC halts in idle");
Andi Kleenddb25f92008-01-30 13:32:41 +0100262 }
263}
Len Brown520daf72009-05-14 17:27:38 -0400264#else
265static void tsc_check_state(int state) { return; }
Andi Kleenddb25f92008-01-30 13:32:41 +0100266#endif
267
Len Brown4be44fc2005-08-05 00:44:28 -0400268static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400272 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274 if (!pr->pblk)
Patrick Mocheld550d982006-06-27 00:41:40 -0400275 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 /* if info is obtained from pblk/fadt, type equals state */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
279 pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
280
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400281#ifndef CONFIG_HOTPLUG_CPU
282 /*
283 * Check for P_LVL2_UP flag before entering C2 and above on
Len Brown4f86d3a2007-10-03 18:58:00 -0400284 * an SMP system.
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400285 */
Alexey Starikovskiyad718602007-02-02 19:48:19 +0300286 if ((num_online_cpus() > 1) &&
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300287 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
Patrick Mocheld550d982006-06-27 00:41:40 -0400288 return -ENODEV;
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400289#endif
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 /* determine C2 and C3 address from pblk */
292 pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
293 pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5;
294
295 /* determine latencies from FADT */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300296 pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency;
297 pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
300 "lvl2[0x%08x] lvl3[0x%08x]\n",
301 pr->power.states[ACPI_STATE_C2].address,
302 pr->power.states[ACPI_STATE_C3].address));
303
Patrick Mocheld550d982006-06-27 00:41:40 -0400304 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305}
306
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700307static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500308{
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700309 if (!pr->power.states[ACPI_STATE_C1].valid) {
310 /* set the first C-State to C1 */
311 /* all processors need to support C1 */
312 pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
313 pr->power.states[ACPI_STATE_C1].valid = 1;
Venkatesh Pallipadi0fda6b42008-04-09 21:31:46 -0400314 pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700315 }
316 /* the C0 state only exists as a filler in our array */
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500317 pr->power.states[ACPI_STATE_C0].valid = 1;
Patrick Mocheld550d982006-06-27 00:41:40 -0400318 return 0;
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500319}
320
Len Brown4be44fc2005-08-05 00:44:28 -0400321static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322{
Len Brown4be44fc2005-08-05 00:44:28 -0400323 acpi_status status = 0;
324 acpi_integer count;
Janosch Machowinskicf824782005-08-20 08:02:00 -0400325 int current_count;
Len Brown4be44fc2005-08-05 00:44:28 -0400326 int i;
327 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
328 union acpi_object *cst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 if (nocst)
Patrick Mocheld550d982006-06-27 00:41:40 -0400332 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700334 current_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer);
337 if (ACPI_FAILURE(status)) {
338 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400339 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400340 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200342 cst = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
344 /* There must be at least 2 elements */
345 if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) {
Len Brown64684632006-06-26 23:41:38 -0400346 printk(KERN_ERR PREFIX "not enough elements in _CST\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 status = -EFAULT;
348 goto end;
349 }
350
351 count = cst->package.elements[0].integer.value;
352
353 /* Validate number of power states. */
354 if (count < 1 || count != cst->package.count - 1) {
Len Brown64684632006-06-26 23:41:38 -0400355 printk(KERN_ERR PREFIX "count given by _CST is not valid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 status = -EFAULT;
357 goto end;
358 }
359
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 /* Tell driver that at least _CST is supported. */
361 pr->flags.has_cst = 1;
362
363 for (i = 1; i <= count; i++) {
364 union acpi_object *element;
365 union acpi_object *obj;
366 struct acpi_power_register *reg;
367 struct acpi_processor_cx cx;
368
369 memset(&cx, 0, sizeof(cx));
370
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200371 element = &(cst->package.elements[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 if (element->type != ACPI_TYPE_PACKAGE)
373 continue;
374
375 if (element->package.count != 4)
376 continue;
377
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200378 obj = &(element->package.elements[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
380 if (obj->type != ACPI_TYPE_BUFFER)
381 continue;
382
Len Brown4be44fc2005-08-05 00:44:28 -0400383 reg = (struct acpi_power_register *)obj->buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
385 if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO &&
Len Brown4be44fc2005-08-05 00:44:28 -0400386 (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 continue;
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 /* There should be an easy way to extract an integer... */
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200390 obj = &(element->package.elements[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 if (obj->type != ACPI_TYPE_INTEGER)
392 continue;
393
394 cx.type = obj->integer.value;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700395 /*
396 * Some buggy BIOSes won't list C1 in _CST -
397 * Let acpi_processor_get_power_info_default() handle them later
398 */
399 if (i == 1 && cx.type != ACPI_STATE_C1)
400 current_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700402 cx.address = reg->address;
403 cx.index = current_count + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800405 cx.entry_method = ACPI_CSTATE_SYSTEMIO;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700406 if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
407 if (acpi_processor_ffh_cstate_probe
408 (pr->id, &cx, reg) == 0) {
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800409 cx.entry_method = ACPI_CSTATE_FFH;
410 } else if (cx.type == ACPI_STATE_C1) {
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700411 /*
412 * C1 is a special case where FIXED_HARDWARE
413 * can be handled in non-MWAIT way as well.
414 * In that case, save this _CST entry info.
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700415 * Otherwise, ignore this info and continue.
416 */
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800417 cx.entry_method = ACPI_CSTATE_HALT;
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800418 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800419 } else {
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700420 continue;
421 }
Zhao Yakuida5e09a2008-06-24 18:01:09 +0800422 if (cx.type == ACPI_STATE_C1 &&
423 (idle_halt || idle_nomwait)) {
Zhao Yakuic1e3b372008-06-24 17:58:53 +0800424 /*
425 * In most cases the C1 space_id obtained from
426 * _CST object is FIXED_HARDWARE access mode.
427 * But when the option of idle=halt is added,
428 * the entry_method type should be changed from
429 * CSTATE_FFH to CSTATE_HALT.
Zhao Yakuida5e09a2008-06-24 18:01:09 +0800430 * When the option of idle=nomwait is added,
431 * the C1 entry_method type should be
432 * CSTATE_HALT.
Zhao Yakuic1e3b372008-06-24 17:58:53 +0800433 */
434 cx.entry_method = ACPI_CSTATE_HALT;
435 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
436 }
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800437 } else {
438 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x",
439 cx.address);
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700440 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
Venkatesh Pallipadi0fda6b42008-04-09 21:31:46 -0400442 if (cx.type == ACPI_STATE_C1) {
443 cx.valid = 1;
444 }
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800445
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200446 obj = &(element->package.elements[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 if (obj->type != ACPI_TYPE_INTEGER)
448 continue;
449
450 cx.latency = obj->integer.value;
451
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200452 obj = &(element->package.elements[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 if (obj->type != ACPI_TYPE_INTEGER)
454 continue;
455
456 cx.power = obj->integer.value;
457
Janosch Machowinskicf824782005-08-20 08:02:00 -0400458 current_count++;
459 memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx));
460
461 /*
462 * We support total ACPI_PROCESSOR_MAX_POWER - 1
463 * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1)
464 */
465 if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) {
466 printk(KERN_WARNING
467 "Limiting number of power states to max (%d)\n",
468 ACPI_PROCESSOR_MAX_POWER);
469 printk(KERN_WARNING
470 "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n");
471 break;
472 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 }
474
Len Brown4be44fc2005-08-05 00:44:28 -0400475 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n",
Janosch Machowinskicf824782005-08-20 08:02:00 -0400476 current_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478 /* Validate number of power states discovered */
Janosch Machowinskicf824782005-08-20 08:02:00 -0400479 if (current_count < 2)
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -0400480 status = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
Len Brown4be44fc2005-08-05 00:44:28 -0400482 end:
Len Brown02438d82006-06-30 03:19:10 -0400483 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Patrick Mocheld550d982006-06-27 00:41:40 -0400485 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486}
487
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
489{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491 if (!cx->address)
Patrick Mocheld550d982006-06-27 00:41:40 -0400492 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 /*
495 * C2 latency must be less than or equal to 100
496 * microseconds.
497 */
498 else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
499 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400500 "latency too large [%d]\n", cx->latency));
Patrick Mocheld550d982006-06-27 00:41:40 -0400501 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 }
503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 /*
505 * Otherwise we've met all of our C2 requirements.
506 * Normalize the C2 latency to expidite policy
507 */
508 cx->valid = 1;
Len Brown4f86d3a2007-10-03 18:58:00 -0400509
Len Brown4f86d3a2007-10-03 18:58:00 -0400510 cx->latency_ticks = cx->latency;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511
Patrick Mocheld550d982006-06-27 00:41:40 -0400512 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513}
514
Len Brown4be44fc2005-08-05 00:44:28 -0400515static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
516 struct acpi_processor_cx *cx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517{
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700518 static int bm_check_flag = -1;
519 static int bm_control_flag = -1;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400520
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
522 if (!cx->address)
Patrick Mocheld550d982006-06-27 00:41:40 -0400523 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
525 /*
526 * C3 latency must be less than or equal to 1000
527 * microseconds.
528 */
529 else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
530 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400531 "latency too large [%d]\n", cx->latency));
Patrick Mocheld550d982006-06-27 00:41:40 -0400532 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 }
534
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 /*
536 * PIIX4 Erratum #18: We don't support C3 when Type-F (fast)
537 * DMA transfers are used by any ISA device to avoid livelock.
538 * Note that we could disable Type-F DMA (as recommended by
539 * the erratum), but this is known to disrupt certain ISA
540 * devices thus we take the conservative approach.
541 */
542 else if (errata.piix4.fdma) {
543 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400544 "C3 not supported on PIIX4 with Type-F DMA\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400545 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 }
547
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400548 /* All the logic here assumes flags.bm_check is same across all CPUs */
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700549 if (bm_check_flag == -1) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400550 /* Determine whether bm_check is needed based on CPU */
551 acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
552 bm_check_flag = pr->flags.bm_check;
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700553 bm_control_flag = pr->flags.bm_control;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400554 } else {
555 pr->flags.bm_check = bm_check_flag;
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700556 pr->flags.bm_control = bm_control_flag;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400557 }
558
559 if (pr->flags.bm_check) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400560 if (!pr->flags.bm_control) {
Venki Pallipadied3110e2007-07-31 12:04:31 -0700561 if (pr->flags.has_cst != 1) {
562 /* bus mastering control is necessary */
563 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
564 "C3 support requires BM control\n"));
565 return;
566 } else {
567 /* Here we enter C3 without bus mastering */
568 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
569 "C3 support without BM control\n"));
570 }
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400571 }
572 } else {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400573 /*
574 * WBINVD should be set in fadt, for C3 state to be
575 * supported on when bm_check is not required.
576 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300577 if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400578 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400579 "Cache invalidation should work properly"
580 " for C3 to be enabled on SMP systems\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400581 return;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400582 }
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400583 }
584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 /*
586 * Otherwise we've met all of our C3 requirements.
587 * Normalize the C3 latency to expidite policy. Enable
588 * checking of bus mastering status (bm_check) so we can
589 * use this in our C3 policy
590 */
591 cx->valid = 1;
Len Brown4f86d3a2007-10-03 18:58:00 -0400592
Len Brown4f86d3a2007-10-03 18:58:00 -0400593 cx->latency_ticks = cx->latency;
Len Brown31878dd2009-01-28 18:28:09 -0500594 /*
595 * On older chipsets, BM_RLD needs to be set
596 * in order for Bus Master activity to wake the
597 * system from C3. Newer chipsets handle DMA
598 * during C3 automatically and BM_RLD is a NOP.
599 * In either case, the proper way to
600 * handle BM_RLD is to set it and leave it set.
601 */
Bob Moore50ffba12009-02-23 15:02:07 +0800602 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Patrick Mocheld550d982006-06-27 00:41:40 -0400604 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605}
606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607static int acpi_processor_power_verify(struct acpi_processor *pr)
608{
609 unsigned int i;
610 unsigned int working = 0;
Venkatesh Pallipadi6eb0a0f2006-01-11 22:44:21 +0100611
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800612 pr->power.timer_broadcast_on_state = INT_MAX;
Venkatesh Pallipadi6eb0a0f2006-01-11 22:44:21 +0100613
Len Browna0bf2842009-05-15 01:29:31 -0400614 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 struct acpi_processor_cx *cx = &pr->power.states[i];
616
617 switch (cx->type) {
618 case ACPI_STATE_C1:
619 cx->valid = 1;
620 break;
621
622 case ACPI_STATE_C2:
623 acpi_processor_power_verify_c2(cx);
624 break;
625
626 case ACPI_STATE_C3:
627 acpi_processor_power_verify_c3(pr, cx);
628 break;
629 }
Len Brown7e275cc2009-05-15 02:08:44 -0400630 if (!cx->valid)
631 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
Len Brown7e275cc2009-05-15 02:08:44 -0400633 lapic_timer_check_state(i, pr, cx);
634 tsc_check_state(cx->type);
635 working++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 }
637
Len Brown7e275cc2009-05-15 02:08:44 -0400638 lapic_timer_propagate_broadcast(pr);
Andi Kleenbd663342006-03-25 16:31:07 +0100639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 return (working);
641}
642
Len Brown4be44fc2005-08-05 00:44:28 -0400643static int acpi_processor_get_power_info(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644{
645 unsigned int i;
646 int result;
647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
649 /* NOTE: the idle thread may not be running while calling
650 * this function */
651
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700652 /* Zero initialize all the C-states info. */
653 memset(pr->power.states, 0, sizeof(pr->power.states));
654
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 result = acpi_processor_get_power_info_cst(pr);
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -0400656 if (result == -ENODEV)
Darrick J. Wongc5a114f2006-10-19 23:28:28 -0700657 result = acpi_processor_get_power_info_fadt(pr);
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -0400658
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700659 if (result)
660 return result;
661
662 acpi_processor_get_power_info_default(pr);
663
Janosch Machowinskicf824782005-08-20 08:02:00 -0400664 pr->power.count = acpi_processor_power_verify(pr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 /*
667 * if one state of type C2 or C3 is available, mark this
668 * CPU as being "idle manageable"
669 */
670 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500671 if (pr->power.states[i].valid) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 pr->power.count = i;
Linus Torvalds2203d6e2005-11-18 07:29:51 -0800673 if (pr->power.states[i].type >= ACPI_STATE_C2)
674 pr->flags.power = 1;
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500675 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 }
677
Patrick Mocheld550d982006-06-27 00:41:40 -0400678 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679}
680
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
682{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200683 struct acpi_processor *pr = seq->private;
Len Brown4be44fc2005-08-05 00:44:28 -0400684 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686
687 if (!pr)
688 goto end;
689
690 seq_printf(seq, "active state: C%zd\n"
Len Brown4be44fc2005-08-05 00:44:28 -0400691 "max_cstate: C%d\n"
Arjan van de Ven5c875792006-09-30 23:27:17 -0700692 "maximum allowed latency: %d usec\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400693 pr->power.state ? pr->power.state - pr->power.states : 0,
Len Brown92614612009-04-22 19:28:15 -0400694 max_cstate, pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
696 seq_puts(seq, "states:\n");
697
698 for (i = 1; i <= pr->power.count; i++) {
699 seq_printf(seq, " %cC%d: ",
Len Brown4be44fc2005-08-05 00:44:28 -0400700 (&pr->power.states[i] ==
701 pr->power.state ? '*' : ' '), i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703 if (!pr->power.states[i].valid) {
704 seq_puts(seq, "<not supported>\n");
705 continue;
706 }
707
708 switch (pr->power.states[i].type) {
709 case ACPI_STATE_C1:
710 seq_printf(seq, "type[C1] ");
711 break;
712 case ACPI_STATE_C2:
713 seq_printf(seq, "type[C2] ");
714 break;
715 case ACPI_STATE_C3:
716 seq_printf(seq, "type[C3] ");
717 break;
718 default:
719 seq_printf(seq, "type[--] ");
720 break;
721 }
722
723 if (pr->power.states[i].promotion.state)
724 seq_printf(seq, "promotion[C%zd] ",
Len Brown4be44fc2005-08-05 00:44:28 -0400725 (pr->power.states[i].promotion.state -
726 pr->power.states));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 else
728 seq_puts(seq, "promotion[--] ");
729
730 if (pr->power.states[i].demotion.state)
731 seq_printf(seq, "demotion[C%zd] ",
Len Brown4be44fc2005-08-05 00:44:28 -0400732 (pr->power.states[i].demotion.state -
733 pr->power.states));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 else
735 seq_puts(seq, "demotion[--] ");
736
Dominik Brodowskia3c65982006-06-24 19:37:00 -0400737 seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400738 pr->power.states[i].latency,
Dominik Brodowskia3c65982006-06-24 19:37:00 -0400739 pr->power.states[i].usage,
Alexey Starikovskiyb0b7eaa2007-01-25 22:39:44 -0500740 (unsigned long long)pr->power.states[i].time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 }
742
Len Brown4be44fc2005-08-05 00:44:28 -0400743 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400744 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745}
746
747static int acpi_processor_power_open_fs(struct inode *inode, struct file *file)
748{
749 return single_open(file, acpi_processor_power_seq_show,
Len Brown4be44fc2005-08-05 00:44:28 -0400750 PDE(inode)->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751}
752
Arjan van de Vend7508032006-07-04 13:06:00 -0400753static const struct file_operations acpi_processor_power_fops = {
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700754 .owner = THIS_MODULE,
Len Brown4be44fc2005-08-05 00:44:28 -0400755 .open = acpi_processor_power_open_fs,
756 .read = seq_read,
757 .llseek = seq_lseek,
758 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759};
760
Len Brown4f86d3a2007-10-03 18:58:00 -0400761
762/**
763 * acpi_idle_bm_check - checks if bus master activity was detected
764 */
765static int acpi_idle_bm_check(void)
766{
767 u32 bm_status = 0;
768
Bob Moore50ffba12009-02-23 15:02:07 +0800769 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
Len Brown4f86d3a2007-10-03 18:58:00 -0400770 if (bm_status)
Bob Moore50ffba12009-02-23 15:02:07 +0800771 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
Len Brown4f86d3a2007-10-03 18:58:00 -0400772 /*
773 * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
774 * the true state of bus mastering activity; forcing us to
775 * manually check the BMIDEA bit of each IDE channel.
776 */
777 else if (errata.piix4.bmisx) {
778 if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
779 || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
780 bm_status = 1;
781 }
782 return bm_status;
783}
784
785/**
Len Brown4f86d3a2007-10-03 18:58:00 -0400786 * acpi_idle_do_entry - a helper function that does C2 and C3 type entry
787 * @cx: cstate data
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800788 *
789 * Caller disables interrupt before call and enables interrupt after return.
Len Brown4f86d3a2007-10-03 18:58:00 -0400790 */
791static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
792{
Steven Rostedtdcf30992008-07-25 18:00:42 -0400793 /* Don't trace irqs off for idle */
794 stop_critical_timings();
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800795 if (cx->entry_method == ACPI_CSTATE_FFH) {
Len Brown4f86d3a2007-10-03 18:58:00 -0400796 /* Call into architectural FFH based C-state */
797 acpi_processor_ffh_cstate_enter(cx);
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800798 } else if (cx->entry_method == ACPI_CSTATE_HALT) {
799 acpi_safe_halt();
Len Brown4f86d3a2007-10-03 18:58:00 -0400800 } else {
801 int unused;
802 /* IO port based C-state */
803 inb(cx->address);
804 /* Dummy wait op - must do something useless after P_LVL2 read
805 because chipsets cannot guarantee that STPCLK# signal
806 gets asserted in time to freeze execution properly. */
807 unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
808 }
Steven Rostedtdcf30992008-07-25 18:00:42 -0400809 start_critical_timings();
Len Brown4f86d3a2007-10-03 18:58:00 -0400810}
811
812/**
813 * acpi_idle_enter_c1 - enters an ACPI C1 state-type
814 * @dev: the target CPU
815 * @state: the state data
816 *
817 * This is equivalent to the HALT instruction.
818 */
819static int acpi_idle_enter_c1(struct cpuidle_device *dev,
820 struct cpuidle_state *state)
821{
alex.shiff69f2b2009-03-04 11:55:26 -0800822 ktime_t kt1, kt2;
823 s64 idle_time;
Len Brown4f86d3a2007-10-03 18:58:00 -0400824 struct acpi_processor *pr;
825 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
venkatesh.pallipadi@intel.com9b12e182008-01-31 17:35:05 -0800826
Mike Travis706546d2008-06-09 16:22:23 -0700827 pr = __get_cpu_var(processors);
Len Brown4f86d3a2007-10-03 18:58:00 -0400828
829 if (unlikely(!pr))
830 return 0;
831
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800832 local_irq_disable();
Venkatesh Pallipadib077fba2008-02-11 15:20:27 -0800833
834 /* Do not access any ACPI IO ports in suspend path */
835 if (acpi_idle_suspend) {
Venkatesh Pallipadib077fba2008-02-11 15:20:27 -0800836 local_irq_enable();
Shaohua Li7d60e8a2009-05-19 16:09:54 +0800837 cpu_relax();
Venkatesh Pallipadib077fba2008-02-11 15:20:27 -0800838 return 0;
839 }
840
Len Brown7e275cc2009-05-15 02:08:44 -0400841 lapic_timer_state_broadcast(pr, cx, 1);
alex.shiff69f2b2009-03-04 11:55:26 -0800842 kt1 = ktime_get_real();
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800843 acpi_idle_do_entry(cx);
alex.shiff69f2b2009-03-04 11:55:26 -0800844 kt2 = ktime_get_real();
845 idle_time = ktime_to_us(ktime_sub(kt2, kt1));
Len Brown4f86d3a2007-10-03 18:58:00 -0400846
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800847 local_irq_enable();
Len Brown4f86d3a2007-10-03 18:58:00 -0400848 cx->usage++;
Len Brown7e275cc2009-05-15 02:08:44 -0400849 lapic_timer_state_broadcast(pr, cx, 0);
Len Brown4f86d3a2007-10-03 18:58:00 -0400850
alex.shiff69f2b2009-03-04 11:55:26 -0800851 return idle_time;
Len Brown4f86d3a2007-10-03 18:58:00 -0400852}
853
854/**
855 * acpi_idle_enter_simple - enters an ACPI state without BM handling
856 * @dev: the target CPU
857 * @state: the state data
858 */
859static int acpi_idle_enter_simple(struct cpuidle_device *dev,
860 struct cpuidle_state *state)
861{
862 struct acpi_processor *pr;
863 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
alex.shiff69f2b2009-03-04 11:55:26 -0800864 ktime_t kt1, kt2;
865 s64 idle_time;
866 s64 sleep_ticks = 0;
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500867
Mike Travis706546d2008-06-09 16:22:23 -0700868 pr = __get_cpu_var(processors);
Len Brown4f86d3a2007-10-03 18:58:00 -0400869
870 if (unlikely(!pr))
871 return 0;
872
Len Browne1964412007-10-04 01:23:47 -0400873 if (acpi_idle_suspend)
874 return(acpi_idle_enter_c1(dev, state));
875
Len Brown4f86d3a2007-10-03 18:58:00 -0400876 local_irq_disable();
877 current_thread_info()->status &= ~TS_POLLING;
878 /*
879 * TS_POLLING-cleared state must be visible before we test
880 * NEED_RESCHED:
881 */
882 smp_mb();
883
884 if (unlikely(need_resched())) {
885 current_thread_info()->status |= TS_POLLING;
886 local_irq_enable();
887 return 0;
888 }
889
Thomas Gleixnere17bcb42007-12-07 19:16:17 +0100890 /*
891 * Must be done before busmaster disable as we might need to
892 * access HPET !
893 */
Len Brown7e275cc2009-05-15 02:08:44 -0400894 lapic_timer_state_broadcast(pr, cx, 1);
Thomas Gleixnere17bcb42007-12-07 19:16:17 +0100895
Len Brown4f86d3a2007-10-03 18:58:00 -0400896 if (cx->type == ACPI_STATE_C3)
897 ACPI_FLUSH_CPU_CACHE();
898
alex.shiff69f2b2009-03-04 11:55:26 -0800899 kt1 = ktime_get_real();
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500900 /* Tell the scheduler that we are going deep-idle: */
901 sched_clock_idle_sleep_event();
Len Brown4f86d3a2007-10-03 18:58:00 -0400902 acpi_idle_do_entry(cx);
alex.shiff69f2b2009-03-04 11:55:26 -0800903 kt2 = ktime_get_real();
904 idle_time = ktime_to_us(ktime_sub(kt2, kt1));
Len Brown4f86d3a2007-10-03 18:58:00 -0400905
alex.shiff69f2b2009-03-04 11:55:26 -0800906 sleep_ticks = us_to_pm_timer_ticks(idle_time);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500907
908 /* Tell the scheduler how much we idled: */
909 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
Len Brown4f86d3a2007-10-03 18:58:00 -0400910
911 local_irq_enable();
912 current_thread_info()->status |= TS_POLLING;
913
914 cx->usage++;
915
Len Brown7e275cc2009-05-15 02:08:44 -0400916 lapic_timer_state_broadcast(pr, cx, 0);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500917 cx->time += sleep_ticks;
alex.shiff69f2b2009-03-04 11:55:26 -0800918 return idle_time;
Len Brown4f86d3a2007-10-03 18:58:00 -0400919}
920
921static int c3_cpu_count;
922static DEFINE_SPINLOCK(c3_lock);
923
924/**
925 * acpi_idle_enter_bm - enters C3 with proper BM handling
926 * @dev: the target CPU
927 * @state: the state data
928 *
929 * If BM is detected, the deepest non-C3 idle state is entered instead.
930 */
931static int acpi_idle_enter_bm(struct cpuidle_device *dev,
932 struct cpuidle_state *state)
933{
934 struct acpi_processor *pr;
935 struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
alex.shiff69f2b2009-03-04 11:55:26 -0800936 ktime_t kt1, kt2;
937 s64 idle_time;
938 s64 sleep_ticks = 0;
939
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500940
Mike Travis706546d2008-06-09 16:22:23 -0700941 pr = __get_cpu_var(processors);
Len Brown4f86d3a2007-10-03 18:58:00 -0400942
943 if (unlikely(!pr))
944 return 0;
945
Len Browne1964412007-10-04 01:23:47 -0400946 if (acpi_idle_suspend)
947 return(acpi_idle_enter_c1(dev, state));
948
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500949 if (acpi_idle_bm_check()) {
950 if (dev->safe_state) {
Venkatesh Pallipadiaddbad42008-09-29 15:24:28 -0700951 dev->last_state = dev->safe_state;
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500952 return dev->safe_state->enter(dev, dev->safe_state);
953 } else {
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800954 local_irq_disable();
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500955 acpi_safe_halt();
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800956 local_irq_enable();
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500957 return 0;
958 }
959 }
960
Len Brown4f86d3a2007-10-03 18:58:00 -0400961 local_irq_disable();
962 current_thread_info()->status &= ~TS_POLLING;
963 /*
964 * TS_POLLING-cleared state must be visible before we test
965 * NEED_RESCHED:
966 */
967 smp_mb();
968
969 if (unlikely(need_resched())) {
970 current_thread_info()->status |= TS_POLLING;
971 local_irq_enable();
972 return 0;
973 }
974
Venki Pallipadi996520c2008-03-24 14:24:10 -0700975 acpi_unlazy_tlb(smp_processor_id());
976
Venkatesh Pallipadi50629112007-11-19 19:49:00 -0500977 /* Tell the scheduler that we are going deep-idle: */
978 sched_clock_idle_sleep_event();
Len Brown4f86d3a2007-10-03 18:58:00 -0400979 /*
980 * Must be done before busmaster disable as we might need to
981 * access HPET !
982 */
Len Brown7e275cc2009-05-15 02:08:44 -0400983 lapic_timer_state_broadcast(pr, cx, 1);
Len Brown4f86d3a2007-10-03 18:58:00 -0400984
Len Brownf461dde2009-04-23 18:59:43 -0400985 kt1 = ktime_get_real();
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500986 /*
987 * disable bus master
988 * bm_check implies we need ARB_DIS
989 * !bm_check implies we need cache flush
990 * bm_control implies whether we can do ARB_DIS
991 *
992 * That leaves a case where bm_check is set and bm_control is
993 * not set. In that case we cannot do much, we enter C3
994 * without doing anything.
995 */
996 if (pr->flags.bm_check && pr->flags.bm_control) {
Len Brown4f86d3a2007-10-03 18:58:00 -0400997 spin_lock(&c3_lock);
998 c3_cpu_count++;
999 /* Disable bus master arbitration when all CPUs are in C3 */
1000 if (c3_cpu_count == num_online_cpus())
Bob Moore50ffba12009-02-23 15:02:07 +08001001 acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
Len Brown4f86d3a2007-10-03 18:58:00 -04001002 spin_unlock(&c3_lock);
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001003 } else if (!pr->flags.bm_check) {
1004 ACPI_FLUSH_CPU_CACHE();
1005 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001006
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001007 acpi_idle_do_entry(cx);
Len Brown4f86d3a2007-10-03 18:58:00 -04001008
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001009 /* Re-enable bus master arbitration */
1010 if (pr->flags.bm_check && pr->flags.bm_control) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001011 spin_lock(&c3_lock);
Bob Moore50ffba12009-02-23 15:02:07 +08001012 acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
Len Brown4f86d3a2007-10-03 18:58:00 -04001013 c3_cpu_count--;
1014 spin_unlock(&c3_lock);
1015 }
Len Brownf461dde2009-04-23 18:59:43 -04001016 kt2 = ktime_get_real();
1017 idle_time = ktime_to_us(ktime_sub(kt2, kt1));
Len Brown4f86d3a2007-10-03 18:58:00 -04001018
alex.shiff69f2b2009-03-04 11:55:26 -08001019 sleep_ticks = us_to_pm_timer_ticks(idle_time);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001020 /* Tell the scheduler how much we idled: */
1021 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
Len Brown4f86d3a2007-10-03 18:58:00 -04001022
1023 local_irq_enable();
1024 current_thread_info()->status |= TS_POLLING;
1025
1026 cx->usage++;
1027
Len Brown7e275cc2009-05-15 02:08:44 -04001028 lapic_timer_state_broadcast(pr, cx, 0);
Venkatesh Pallipadi50629112007-11-19 19:49:00 -05001029 cx->time += sleep_ticks;
alex.shiff69f2b2009-03-04 11:55:26 -08001030 return idle_time;
Len Brown4f86d3a2007-10-03 18:58:00 -04001031}
1032
1033struct cpuidle_driver acpi_idle_driver = {
1034 .name = "acpi_idle",
1035 .owner = THIS_MODULE,
1036};
1037
1038/**
1039 * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE
1040 * @pr: the ACPI processor
1041 */
1042static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
1043{
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -08001044 int i, count = CPUIDLE_DRIVER_STATE_START;
Len Brown4f86d3a2007-10-03 18:58:00 -04001045 struct acpi_processor_cx *cx;
1046 struct cpuidle_state *state;
1047 struct cpuidle_device *dev = &pr->power.dev;
1048
1049 if (!pr->flags.power_setup_done)
1050 return -EINVAL;
1051
1052 if (pr->flags.power == 0) {
1053 return -EINVAL;
1054 }
1055
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001056 dev->cpu = pr->id;
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -08001057 for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
1058 dev->states[i].name[0] = '\0';
1059 dev->states[i].desc[0] = '\0';
1060 }
1061
Len Brown615dfd92009-04-23 23:21:29 -04001062 if (max_cstate == 0)
1063 max_cstate = 1;
1064
Len Brown4f86d3a2007-10-03 18:58:00 -04001065 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
1066 cx = &pr->power.states[i];
1067 state = &dev->states[count];
1068
1069 if (!cx->valid)
1070 continue;
1071
1072#ifdef CONFIG_HOTPLUG_CPU
1073 if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
1074 !pr->flags.has_cst &&
1075 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
1076 continue;
1077#endif
1078 cpuidle_set_statedata(state, cx);
1079
1080 snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -08001081 strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
Len Brown4f86d3a2007-10-03 18:58:00 -04001082 state->exit_latency = cx->latency;
Len Brown4963f622007-12-13 23:50:45 -05001083 state->target_residency = cx->latency * latency_factor;
Len Brown4f86d3a2007-10-03 18:58:00 -04001084 state->power_usage = cx->power;
1085
1086 state->flags = 0;
1087 switch (cx->type) {
1088 case ACPI_STATE_C1:
1089 state->flags |= CPUIDLE_FLAG_SHALLOW;
Venki Pallipadi8e92b662008-02-29 10:24:32 -08001090 if (cx->entry_method == ACPI_CSTATE_FFH)
1091 state->flags |= CPUIDLE_FLAG_TIME_VALID;
1092
Len Brown4f86d3a2007-10-03 18:58:00 -04001093 state->enter = acpi_idle_enter_c1;
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001094 dev->safe_state = state;
Len Brown4f86d3a2007-10-03 18:58:00 -04001095 break;
1096
1097 case ACPI_STATE_C2:
1098 state->flags |= CPUIDLE_FLAG_BALANCED;
1099 state->flags |= CPUIDLE_FLAG_TIME_VALID;
1100 state->enter = acpi_idle_enter_simple;
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -05001101 dev->safe_state = state;
Len Brown4f86d3a2007-10-03 18:58:00 -04001102 break;
1103
1104 case ACPI_STATE_C3:
1105 state->flags |= CPUIDLE_FLAG_DEEP;
1106 state->flags |= CPUIDLE_FLAG_TIME_VALID;
1107 state->flags |= CPUIDLE_FLAG_CHECK_BM;
1108 state->enter = pr->flags.bm_check ?
1109 acpi_idle_enter_bm :
1110 acpi_idle_enter_simple;
1111 break;
1112 }
1113
1114 count++;
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -08001115 if (count == CPUIDLE_STATE_MAX)
1116 break;
Len Brown4f86d3a2007-10-03 18:58:00 -04001117 }
1118
1119 dev->state_count = count;
1120
1121 if (!count)
1122 return -EINVAL;
1123
Len Brown4f86d3a2007-10-03 18:58:00 -04001124 return 0;
1125}
1126
1127int acpi_processor_cst_has_changed(struct acpi_processor *pr)
1128{
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001129 int ret = 0;
Len Brown4f86d3a2007-10-03 18:58:00 -04001130
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001131 if (boot_option_idle_override)
1132 return 0;
1133
Len Brown4f86d3a2007-10-03 18:58:00 -04001134 if (!pr)
1135 return -EINVAL;
1136
1137 if (nocst) {
1138 return -ENODEV;
1139 }
1140
1141 if (!pr->flags.power_setup_done)
1142 return -ENODEV;
1143
1144 cpuidle_pause_and_lock();
1145 cpuidle_disable_device(&pr->power.dev);
1146 acpi_processor_get_power_info(pr);
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001147 if (pr->flags.power) {
1148 acpi_processor_setup_cpuidle(pr);
1149 ret = cpuidle_enable_device(&pr->power.dev);
1150 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001151 cpuidle_resume_and_unlock();
1152
1153 return ret;
1154}
1155
Pierre Ossman7af8b662006-10-10 14:20:31 -07001156int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
Len Brown4be44fc2005-08-05 00:44:28 -04001157 struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158{
Len Brown4be44fc2005-08-05 00:44:28 -04001159 acpi_status status = 0;
Andreas Mohrb6835052006-04-27 05:25:00 -04001160 static int first_run;
Len Brown4be44fc2005-08-05 00:44:28 -04001161 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 unsigned int i;
1163
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001164 if (boot_option_idle_override)
1165 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
1167 if (!first_run) {
Zhao Yakuic1e3b372008-06-24 17:58:53 +08001168 if (idle_halt) {
1169 /*
1170 * When the boot option of "idle=halt" is added, halt
1171 * is used for CPU IDLE.
1172 * In such case C2/C3 is meaningless. So the max_cstate
1173 * is set to one.
1174 */
1175 max_cstate = 1;
1176 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 dmi_check_system(processor_power_dmi_table);
Alexey Starikovskiyc1c30632007-11-26 20:42:19 +01001178 max_cstate = acpi_processor_cstate_check(max_cstate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 if (max_cstate < ACPI_C_STATES_MAX)
Len Brown4be44fc2005-08-05 00:44:28 -04001180 printk(KERN_NOTICE
1181 "ACPI: processor limited to max C-state %d\n",
1182 max_cstate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 first_run++;
1184 }
1185
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001186 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -04001187 return -EINVAL;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04001188
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001189 if (acpi_gbl_FADT.cst_control && !nocst) {
Len Brown4be44fc2005-08-05 00:44:28 -04001190 status =
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001191 acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001193 ACPI_EXCEPTION((AE_INFO, status,
1194 "Notifying BIOS of _CST ability failed"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 }
1196 }
1197
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 acpi_processor_get_power_info(pr);
Len Brown4f86d3a2007-10-03 18:58:00 -04001199 pr->flags.power_setup_done = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200
1201 /*
1202 * Install the idle handler if processor power management is supported.
1203 * Note that we use previously set idle handler will be used on
1204 * platforms that only support C1.
1205 */
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001206 if (pr->flags.power) {
Len Brown4f86d3a2007-10-03 18:58:00 -04001207 acpi_processor_setup_cpuidle(pr);
Len Brown4f86d3a2007-10-03 18:58:00 -04001208 if (cpuidle_register_device(&pr->power.dev))
1209 return -EIO;
Len Brown4f86d3a2007-10-03 18:58:00 -04001210
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id);
1212 for (i = 1; i <= pr->power.count; i++)
1213 if (pr->power.states[i].valid)
Len Brown4be44fc2005-08-05 00:44:28 -04001214 printk(" C%d[C%d]", i,
1215 pr->power.states[i].type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 printk(")\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 }
1218
1219 /* 'power' [R] */
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -07001220 entry = proc_create_data(ACPI_PROCESSOR_FILE_POWER,
1221 S_IRUGO, acpi_device_dir(device),
1222 &acpi_processor_power_fops,
1223 acpi_driver_data(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 if (!entry)
Thomas Renningera6fc6722006-06-26 23:58:43 -04001225 return -EIO;
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
1238 if (acpi_device_dir(device))
Len Brown4be44fc2005-08-05 00:44:28 -04001239 remove_proc_entry(ACPI_PROCESSOR_FILE_POWER,
1240 acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241
Patrick Mocheld550d982006-06-27 00:41:40 -04001242 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243}