Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * processor_idle - idle state submodule to the ACPI processor driver |
| 3 | * |
| 4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 6 | * Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> |
| 8 | * - Added processor hotplug support |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 9 | * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> |
| 10 | * - Added support for C3 on SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * |
| 12 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or (at |
| 17 | * your option) any later version. |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, but |
| 20 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 22 | * General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License along |
| 25 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 26 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 27 | * |
| 28 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 29 | */ |
| 30 | |
| 31 | #include <linux/kernel.h> |
| 32 | #include <linux/module.h> |
| 33 | #include <linux/init.h> |
| 34 | #include <linux/cpufreq.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 35 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/acpi.h> |
| 37 | #include <linux/dmi.h> |
| 38 | #include <linux/moduleparam.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 39 | #include <linux/sched.h> /* need_resched() */ |
Mark Gross | f011e2e | 2008-02-04 22:30:09 -0800 | [diff] [blame] | 40 | #include <linux/pm_qos_params.h> |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 41 | #include <linux/clockchips.h> |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 42 | #include <linux/cpuidle.h> |
Russell King | ba84be2 | 2009-01-06 14:41:07 -0800 | [diff] [blame] | 43 | #include <linux/irqflags.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Thomas Gleixner | 3434933 | 2007-02-16 01:27:54 -0800 | [diff] [blame] | 45 | /* |
| 46 | * Include the apic definitions for x86 to have the APIC timer related defines |
| 47 | * available also for UP (on SMP it gets magically included via linux/smp.h). |
| 48 | * asm/acpi.h is not an option, as it would require more include magic. Also |
| 49 | * creating an empty asm-ia64/apic.h would just trade pest vs. cholera. |
| 50 | */ |
| 51 | #ifdef CONFIG_X86 |
| 52 | #include <asm/apic.h> |
| 53 | #endif |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <asm/io.h> |
| 56 | #include <asm/uaccess.h> |
| 57 | |
| 58 | #include <acpi/acpi_bus.h> |
| 59 | #include <acpi/processor.h> |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 60 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
Len Brown | a192a95 | 2009-07-28 16:45:54 -0400 | [diff] [blame] | 62 | #define PREFIX "ACPI: " |
| 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | #define ACPI_PROCESSOR_CLASS "processor" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
Len Brown | f52fd66 | 2007-02-12 22:42:12 -0500 | [diff] [blame] | 66 | ACPI_MODULE_NAME("processor_idle"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #define ACPI_PROCESSOR_FILE_POWER "power" |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 68 | #define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 69 | #define C2_OVERHEAD 1 /* 1us */ |
| 70 | #define C3_OVERHEAD 1 /* 1us */ |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 71 | #define PM_TIMER_TICKS_TO_US(p) (((p) * 1000)/(PM_TIMER_FREQUENCY/1000)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 73 | static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; |
| 74 | module_param(max_cstate, uint, 0000); |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 75 | static unsigned int nocst __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | module_param(nocst, uint, 0000); |
Len Brown | d3e7e99 | 2010-07-22 17:23:10 -0400 | [diff] [blame] | 77 | static int bm_check_disable __read_mostly; |
| 78 | module_param(bm_check_disable, uint, 0000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Len Brown | 25de571 | 2007-12-14 00:24:15 -0500 | [diff] [blame] | 80 | static unsigned int latency_factor __read_mostly = 2; |
Len Brown | 4963f62 | 2007-12-13 23:50:45 -0500 | [diff] [blame] | 81 | module_param(latency_factor, uint, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
| 83 | /* |
| 84 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. |
| 85 | * For now disable this. Probably a bug somewhere else. |
| 86 | * |
| 87 | * To skip this limit, boot/load with a large max_cstate limit. |
| 88 | */ |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 89 | static int set_max_cstate(const struct dmi_system_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | { |
| 91 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) |
| 92 | return 0; |
| 93 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 94 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 95 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
| 96 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 98 | max_cstate = (long)id->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
Ashok Raj | 7ded568 | 2006-02-03 21:51:23 +0100 | [diff] [blame] | 103 | /* Actually this shouldn't be __cpuinitdata, would be better to fix the |
| 104 | callers to only run once -AK */ |
| 105 | static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 106 | { set_max_cstate, "Clevo 5600D", { |
| 107 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 108 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 109 | (void *)2}, |
Arjan van de Ven | 370d5cd | 2010-01-27 15:25:39 -0800 | [diff] [blame] | 110 | { set_max_cstate, "Pavilion zv5000", { |
| 111 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
| 112 | DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")}, |
| 113 | (void *)1}, |
| 114 | { set_max_cstate, "Asus L8400B", { |
| 115 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), |
| 116 | DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")}, |
| 117 | (void *)1}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | {}, |
| 119 | }; |
| 120 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 121 | |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 122 | /* |
| 123 | * Callers should disable interrupts before the call and enable |
| 124 | * interrupts after return. |
| 125 | */ |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 126 | static void acpi_safe_halt(void) |
| 127 | { |
| 128 | current_thread_info()->status &= ~TS_POLLING; |
| 129 | /* |
| 130 | * TS_POLLING-cleared state must be visible before we |
| 131 | * test NEED_RESCHED: |
| 132 | */ |
| 133 | smp_mb(); |
Venki Pallipadi | 71e93d1 | 2008-03-13 17:18:19 -0700 | [diff] [blame] | 134 | if (!need_resched()) { |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 135 | safe_halt(); |
Venki Pallipadi | 71e93d1 | 2008-03-13 17:18:19 -0700 | [diff] [blame] | 136 | local_irq_disable(); |
| 137 | } |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 138 | current_thread_info()->status |= TS_POLLING; |
| 139 | } |
| 140 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 141 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
| 142 | |
| 143 | /* |
| 144 | * Some BIOS implementations switch to C3 in the published C2 state. |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 145 | * This seems to be a common problem on AMD boxen, but other vendors |
| 146 | * are affected too. We pick the most conservative approach: we assume |
| 147 | * that the local APIC stops in both C2 and C3. |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 148 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 149 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 150 | struct acpi_processor_cx *cx) |
| 151 | { |
| 152 | struct acpi_processor_power *pwr = &pr->power; |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 153 | u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2; |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 154 | |
Venkatesh Pallipadi | db954b5 | 2009-04-06 18:51:29 -0700 | [diff] [blame] | 155 | if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT)) |
| 156 | return; |
| 157 | |
Shaohua Li | 87ad57ba | 2009-05-19 16:09:42 +0800 | [diff] [blame] | 158 | if (boot_cpu_has(X86_FEATURE_AMDC1E)) |
| 159 | type = ACPI_STATE_C1; |
| 160 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 161 | /* |
| 162 | * Check, if one of the previous states already marked the lapic |
| 163 | * unstable |
| 164 | */ |
| 165 | if (pwr->timer_broadcast_on_state < state) |
| 166 | return; |
| 167 | |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 168 | if (cx->type >= type) |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 169 | pr->power.timer_broadcast_on_state = state; |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 170 | } |
| 171 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 172 | static void __lapic_timer_propagate_broadcast(void *arg) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 173 | { |
Suresh Siddha | f833bab | 2009-08-17 14:34:59 -0700 | [diff] [blame] | 174 | struct acpi_processor *pr = (struct acpi_processor *) arg; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 175 | unsigned long reason; |
| 176 | |
| 177 | reason = pr->power.timer_broadcast_on_state < INT_MAX ? |
| 178 | CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; |
| 179 | |
| 180 | clockevents_notify(reason, &pr->id); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 181 | } |
| 182 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 183 | static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) |
| 184 | { |
| 185 | smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast, |
| 186 | (void *)pr, 1); |
| 187 | } |
| 188 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 189 | /* Power(C) State timer broadcast control */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 190 | static void lapic_timer_state_broadcast(struct acpi_processor *pr, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 191 | struct acpi_processor_cx *cx, |
| 192 | int broadcast) |
| 193 | { |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 194 | int state = cx - pr->power.states; |
| 195 | |
| 196 | if (state >= pr->power.timer_broadcast_on_state) { |
| 197 | unsigned long reason; |
| 198 | |
| 199 | reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : |
| 200 | CLOCK_EVT_NOTIFY_BROADCAST_EXIT; |
| 201 | clockevents_notify(reason, &pr->id); |
| 202 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | #else |
| 206 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 207 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 208 | struct acpi_processor_cx *cstate) { } |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 209 | static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { } |
| 210 | static void lapic_timer_state_broadcast(struct acpi_processor *pr, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 211 | struct acpi_processor_cx *cx, |
| 212 | int broadcast) |
| 213 | { |
| 214 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 215 | |
| 216 | #endif |
| 217 | |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 218 | /* |
| 219 | * Suspend / resume control |
| 220 | */ |
| 221 | static int acpi_idle_suspend; |
Len Brown | 815ab0f | 2009-05-07 22:19:45 -0400 | [diff] [blame] | 222 | static u32 saved_bm_rld; |
| 223 | |
| 224 | static void acpi_idle_bm_rld_save(void) |
| 225 | { |
| 226 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); |
| 227 | } |
| 228 | static void acpi_idle_bm_rld_restore(void) |
| 229 | { |
| 230 | u32 resumed_bm_rld; |
| 231 | |
| 232 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); |
| 233 | |
| 234 | if (resumed_bm_rld != saved_bm_rld) |
| 235 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); |
| 236 | } |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 237 | |
| 238 | int acpi_processor_suspend(struct acpi_device * device, pm_message_t state) |
| 239 | { |
Len Brown | 815ab0f | 2009-05-07 22:19:45 -0400 | [diff] [blame] | 240 | if (acpi_idle_suspend == 1) |
| 241 | return 0; |
| 242 | |
| 243 | acpi_idle_bm_rld_save(); |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 244 | acpi_idle_suspend = 1; |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | int acpi_processor_resume(struct acpi_device * device) |
| 249 | { |
Len Brown | 815ab0f | 2009-05-07 22:19:45 -0400 | [diff] [blame] | 250 | if (acpi_idle_suspend == 0) |
| 251 | return 0; |
| 252 | |
| 253 | acpi_idle_bm_rld_restore(); |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 254 | acpi_idle_suspend = 0; |
| 255 | return 0; |
| 256 | } |
| 257 | |
Pavel Machek | 6133116 | 2008-02-19 11:00:29 +0100 | [diff] [blame] | 258 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86) |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 259 | static void tsc_check_state(int state) |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 260 | { |
| 261 | switch (boot_cpu_data.x86_vendor) { |
| 262 | case X86_VENDOR_AMD: |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 263 | case X86_VENDOR_INTEL: |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 264 | /* |
| 265 | * AMD Fam10h TSC will tick in all |
| 266 | * C/P/S0/S1 states when this bit is set. |
| 267 | */ |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 268 | if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 269 | return; |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 270 | |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 271 | /*FALL THROUGH*/ |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 272 | default: |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 273 | /* TSC could halt in idle, so notify users */ |
| 274 | if (state > ACPI_STATE_C1) |
| 275 | mark_tsc_unstable("TSC halts in idle"); |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 276 | } |
| 277 | } |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 278 | #else |
| 279 | static void tsc_check_state(int state) { return; } |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 280 | #endif |
| 281 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 282 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
| 285 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 286 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
| 288 | if (!pr->pblk) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 289 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | /* if info is obtained from pblk/fadt, type equals state */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
| 293 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; |
| 294 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 295 | #ifndef CONFIG_HOTPLUG_CPU |
| 296 | /* |
| 297 | * Check for P_LVL2_UP flag before entering C2 and above on |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 298 | * an SMP system. |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 299 | */ |
Alexey Starikovskiy | ad71860a | 2007-02-02 19:48:19 +0300 | [diff] [blame] | 300 | if ((num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 301 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 302 | return -ENODEV; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 303 | #endif |
| 304 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | /* determine C2 and C3 address from pblk */ |
| 306 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; |
| 307 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; |
| 308 | |
| 309 | /* determine latencies from FADT */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 310 | pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency; |
| 311 | pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Len Brown | 5d76b6f | 2010-01-19 22:41:14 -0500 | [diff] [blame] | 313 | /* |
| 314 | * FADT specified C2 latency must be less than or equal to |
| 315 | * 100 microseconds. |
| 316 | */ |
| 317 | if (acpi_gbl_FADT.C2latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { |
| 318 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 319 | "C2 latency too large [%d]\n", acpi_gbl_FADT.C2latency)); |
| 320 | /* invalidate C2 */ |
| 321 | pr->power.states[ACPI_STATE_C2].address = 0; |
| 322 | } |
| 323 | |
Len Brown | a6d72c1 | 2010-01-19 23:10:04 -0500 | [diff] [blame] | 324 | /* |
| 325 | * FADT supplied C3 latency must be less than or equal to |
| 326 | * 1000 microseconds. |
| 327 | */ |
| 328 | if (acpi_gbl_FADT.C3latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { |
| 329 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 330 | "C3 latency too large [%d]\n", acpi_gbl_FADT.C3latency)); |
| 331 | /* invalidate C3 */ |
| 332 | pr->power.states[ACPI_STATE_C3].address = 0; |
| 333 | } |
| 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 336 | "lvl2[0x%08x] lvl3[0x%08x]\n", |
| 337 | pr->power.states[ACPI_STATE_C2].address, |
| 338 | pr->power.states[ACPI_STATE_C3].address)); |
| 339 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 340 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | } |
| 342 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 343 | static int acpi_processor_get_power_info_default(struct acpi_processor *pr) |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 344 | { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 345 | if (!pr->power.states[ACPI_STATE_C1].valid) { |
| 346 | /* set the first C-State to C1 */ |
| 347 | /* all processors need to support C1 */ |
| 348 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; |
| 349 | pr->power.states[ACPI_STATE_C1].valid = 1; |
Venkatesh Pallipadi | 0fda6b4 | 2008-04-09 21:31:46 -0400 | [diff] [blame] | 350 | pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 351 | } |
| 352 | /* the C0 state only exists as a filler in our array */ |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 353 | pr->power.states[ACPI_STATE_C0].valid = 1; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 354 | return 0; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 355 | } |
| 356 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 357 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 359 | acpi_status status = 0; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 360 | u64 count; |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 361 | int current_count; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 362 | int i; |
| 363 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 364 | union acpi_object *cst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | if (nocst) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 368 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 370 | current_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
| 372 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); |
| 373 | if (ACPI_FAILURE(status)) { |
| 374 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 375 | return -ENODEV; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 376 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 378 | cst = buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
| 380 | /* There must be at least 2 elements */ |
| 381 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 382 | printk(KERN_ERR PREFIX "not enough elements in _CST\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | status = -EFAULT; |
| 384 | goto end; |
| 385 | } |
| 386 | |
| 387 | count = cst->package.elements[0].integer.value; |
| 388 | |
| 389 | /* Validate number of power states. */ |
| 390 | if (count < 1 || count != cst->package.count - 1) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 391 | printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | status = -EFAULT; |
| 393 | goto end; |
| 394 | } |
| 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | /* Tell driver that at least _CST is supported. */ |
| 397 | pr->flags.has_cst = 1; |
| 398 | |
| 399 | for (i = 1; i <= count; i++) { |
| 400 | union acpi_object *element; |
| 401 | union acpi_object *obj; |
| 402 | struct acpi_power_register *reg; |
| 403 | struct acpi_processor_cx cx; |
| 404 | |
| 405 | memset(&cx, 0, sizeof(cx)); |
| 406 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 407 | element = &(cst->package.elements[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | if (element->type != ACPI_TYPE_PACKAGE) |
| 409 | continue; |
| 410 | |
| 411 | if (element->package.count != 4) |
| 412 | continue; |
| 413 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 414 | obj = &(element->package.elements[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
| 416 | if (obj->type != ACPI_TYPE_BUFFER) |
| 417 | continue; |
| 418 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 419 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
| 421 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 422 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | continue; |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | /* There should be an easy way to extract an integer... */ |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 426 | obj = &(element->package.elements[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | if (obj->type != ACPI_TYPE_INTEGER) |
| 428 | continue; |
| 429 | |
| 430 | cx.type = obj->integer.value; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 431 | /* |
| 432 | * Some buggy BIOSes won't list C1 in _CST - |
| 433 | * Let acpi_processor_get_power_info_default() handle them later |
| 434 | */ |
| 435 | if (i == 1 && cx.type != ACPI_STATE_C1) |
| 436 | current_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 438 | cx.address = reg->address; |
| 439 | cx.index = current_count + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 441 | cx.entry_method = ACPI_CSTATE_SYSTEMIO; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 442 | if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { |
| 443 | if (acpi_processor_ffh_cstate_probe |
| 444 | (pr->id, &cx, reg) == 0) { |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 445 | cx.entry_method = ACPI_CSTATE_FFH; |
| 446 | } else if (cx.type == ACPI_STATE_C1) { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 447 | /* |
| 448 | * C1 is a special case where FIXED_HARDWARE |
| 449 | * can be handled in non-MWAIT way as well. |
| 450 | * In that case, save this _CST entry info. |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 451 | * Otherwise, ignore this info and continue. |
| 452 | */ |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 453 | cx.entry_method = ACPI_CSTATE_HALT; |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 454 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 455 | } else { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 456 | continue; |
| 457 | } |
Zhao Yakui | da5e09a | 2008-06-24 18:01:09 +0800 | [diff] [blame] | 458 | if (cx.type == ACPI_STATE_C1 && |
| 459 | (idle_halt || idle_nomwait)) { |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 460 | /* |
| 461 | * In most cases the C1 space_id obtained from |
| 462 | * _CST object is FIXED_HARDWARE access mode. |
| 463 | * But when the option of idle=halt is added, |
| 464 | * the entry_method type should be changed from |
| 465 | * CSTATE_FFH to CSTATE_HALT. |
Zhao Yakui | da5e09a | 2008-06-24 18:01:09 +0800 | [diff] [blame] | 466 | * When the option of idle=nomwait is added, |
| 467 | * the C1 entry_method type should be |
| 468 | * CSTATE_HALT. |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 469 | */ |
| 470 | cx.entry_method = ACPI_CSTATE_HALT; |
| 471 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
| 472 | } |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 473 | } else { |
| 474 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", |
| 475 | cx.address); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 476 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
Venkatesh Pallipadi | 0fda6b4 | 2008-04-09 21:31:46 -0400 | [diff] [blame] | 478 | if (cx.type == ACPI_STATE_C1) { |
| 479 | cx.valid = 1; |
| 480 | } |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 481 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 482 | obj = &(element->package.elements[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | if (obj->type != ACPI_TYPE_INTEGER) |
| 484 | continue; |
| 485 | |
| 486 | cx.latency = obj->integer.value; |
| 487 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 488 | obj = &(element->package.elements[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | if (obj->type != ACPI_TYPE_INTEGER) |
| 490 | continue; |
| 491 | |
| 492 | cx.power = obj->integer.value; |
| 493 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 494 | current_count++; |
| 495 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); |
| 496 | |
| 497 | /* |
| 498 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 |
| 499 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) |
| 500 | */ |
| 501 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { |
| 502 | printk(KERN_WARNING |
| 503 | "Limiting number of power states to max (%d)\n", |
| 504 | ACPI_PROCESSOR_MAX_POWER); |
| 505 | printk(KERN_WARNING |
| 506 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); |
| 507 | break; |
| 508 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
| 510 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 511 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 512 | current_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
| 514 | /* Validate number of power states discovered */ |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 515 | if (current_count < 2) |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 516 | status = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 518 | end: |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 519 | kfree(buffer.pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 521 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | } |
| 523 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 524 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
| 525 | struct acpi_processor_cx *cx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | { |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 527 | static int bm_check_flag = -1; |
| 528 | static int bm_control_flag = -1; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
| 531 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 532 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
| 534 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) |
| 536 | * DMA transfers are used by any ISA device to avoid livelock. |
| 537 | * Note that we could disable Type-F DMA (as recommended by |
| 538 | * the erratum), but this is known to disrupt certain ISA |
| 539 | * devices thus we take the conservative approach. |
| 540 | */ |
| 541 | else if (errata.piix4.fdma) { |
| 542 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 543 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 544 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | } |
| 546 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 547 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 548 | if (bm_check_flag == -1) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 549 | /* Determine whether bm_check is needed based on CPU */ |
| 550 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); |
| 551 | bm_check_flag = pr->flags.bm_check; |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 552 | bm_control_flag = pr->flags.bm_control; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 553 | } else { |
| 554 | pr->flags.bm_check = bm_check_flag; |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 555 | pr->flags.bm_control = bm_control_flag; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 556 | } |
| 557 | |
| 558 | if (pr->flags.bm_check) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 559 | if (!pr->flags.bm_control) { |
Venki Pallipadi | ed3110e | 2007-07-31 12:04:31 -0700 | [diff] [blame] | 560 | if (pr->flags.has_cst != 1) { |
| 561 | /* bus mastering control is necessary */ |
| 562 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 563 | "C3 support requires BM control\n")); |
| 564 | return; |
| 565 | } else { |
| 566 | /* Here we enter C3 without bus mastering */ |
| 567 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 568 | "C3 support without BM control\n")); |
| 569 | } |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 570 | } |
| 571 | } else { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 572 | /* |
| 573 | * WBINVD should be set in fadt, for C3 state to be |
| 574 | * supported on when bm_check is not required. |
| 575 | */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 576 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 577 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 578 | "Cache invalidation should work properly" |
| 579 | " for C3 to be enabled on SMP systems\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 580 | return; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 581 | } |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 582 | } |
| 583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | /* |
| 585 | * Otherwise we've met all of our C3 requirements. |
| 586 | * Normalize the C3 latency to expidite policy. Enable |
| 587 | * checking of bus mastering status (bm_check) so we can |
| 588 | * use this in our C3 policy |
| 589 | */ |
| 590 | cx->valid = 1; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 591 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 592 | cx->latency_ticks = cx->latency; |
Len Brown | 31878dd | 2009-01-28 18:28:09 -0500 | [diff] [blame] | 593 | /* |
| 594 | * On older chipsets, BM_RLD needs to be set |
| 595 | * in order for Bus Master activity to wake the |
| 596 | * system from C3. Newer chipsets handle DMA |
| 597 | * during C3 automatically and BM_RLD is a NOP. |
| 598 | * In either case, the proper way to |
| 599 | * handle BM_RLD is to set it and leave it set. |
| 600 | */ |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 601 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 603 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } |
| 605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
| 607 | { |
| 608 | unsigned int i; |
| 609 | unsigned int working = 0; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 610 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 611 | pr->power.timer_broadcast_on_state = INT_MAX; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 612 | |
Len Brown | a0bf284 | 2009-05-15 01:29:31 -0400 | [diff] [blame] | 613 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
| 615 | |
| 616 | switch (cx->type) { |
| 617 | case ACPI_STATE_C1: |
| 618 | cx->valid = 1; |
| 619 | break; |
| 620 | |
| 621 | case ACPI_STATE_C2: |
Len Brown | d22edd2 | 2010-01-19 23:29:09 -0500 | [diff] [blame] | 622 | if (!cx->address) |
| 623 | break; |
| 624 | cx->valid = 1; |
| 625 | cx->latency_ticks = cx->latency; /* Normalize latency */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | break; |
| 627 | |
| 628 | case ACPI_STATE_C3: |
| 629 | acpi_processor_power_verify_c3(pr, cx); |
| 630 | break; |
| 631 | } |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 632 | if (!cx->valid) |
| 633 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 635 | lapic_timer_check_state(i, pr, cx); |
| 636 | tsc_check_state(cx->type); |
| 637 | working++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | } |
| 639 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 640 | lapic_timer_propagate_broadcast(pr); |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 641 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | return (working); |
| 643 | } |
| 644 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 645 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | { |
| 647 | unsigned int i; |
| 648 | int result; |
| 649 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
| 651 | /* NOTE: the idle thread may not be running while calling |
| 652 | * this function */ |
| 653 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 654 | /* Zero initialize all the C-states info. */ |
| 655 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
| 656 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | result = acpi_processor_get_power_info_cst(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 658 | if (result == -ENODEV) |
Darrick J. Wong | c5a114f | 2006-10-19 23:28:28 -0700 | [diff] [blame] | 659 | result = acpi_processor_get_power_info_fadt(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 660 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 661 | if (result) |
| 662 | return result; |
| 663 | |
| 664 | acpi_processor_get_power_info_default(pr); |
| 665 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 666 | pr->power.count = acpi_processor_power_verify(pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | /* |
| 669 | * if one state of type C2 or C3 is available, mark this |
| 670 | * CPU as being "idle manageable" |
| 671 | */ |
| 672 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 673 | if (pr->power.states[i].valid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | pr->power.count = i; |
Linus Torvalds | 2203d6e | 2005-11-18 07:29:51 -0800 | [diff] [blame] | 675 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
| 676 | pr->flags.power = 1; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 677 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
| 679 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 680 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | } |
| 682 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 683 | /** |
| 684 | * acpi_idle_bm_check - checks if bus master activity was detected |
| 685 | */ |
| 686 | static int acpi_idle_bm_check(void) |
| 687 | { |
| 688 | u32 bm_status = 0; |
| 689 | |
Len Brown | d3e7e99 | 2010-07-22 17:23:10 -0400 | [diff] [blame] | 690 | if (bm_check_disable) |
| 691 | return 0; |
| 692 | |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 693 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 694 | if (bm_status) |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 695 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 696 | /* |
| 697 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect |
| 698 | * the true state of bus mastering activity; forcing us to |
| 699 | * manually check the BMIDEA bit of each IDE channel. |
| 700 | */ |
| 701 | else if (errata.piix4.bmisx) { |
| 702 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) |
| 703 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
| 704 | bm_status = 1; |
| 705 | } |
| 706 | return bm_status; |
| 707 | } |
| 708 | |
| 709 | /** |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 710 | * acpi_idle_do_entry - a helper function that does C2 and C3 type entry |
| 711 | * @cx: cstate data |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 712 | * |
| 713 | * Caller disables interrupt before call and enables interrupt after return. |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 714 | */ |
| 715 | static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) |
| 716 | { |
Steven Rostedt | dcf30997 | 2008-07-25 18:00:42 -0400 | [diff] [blame] | 717 | /* Don't trace irqs off for idle */ |
| 718 | stop_critical_timings(); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 719 | if (cx->entry_method == ACPI_CSTATE_FFH) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 720 | /* Call into architectural FFH based C-state */ |
| 721 | acpi_processor_ffh_cstate_enter(cx); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 722 | } else if (cx->entry_method == ACPI_CSTATE_HALT) { |
| 723 | acpi_safe_halt(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 724 | } else { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 725 | /* IO port based C-state */ |
| 726 | inb(cx->address); |
| 727 | /* Dummy wait op - must do something useless after P_LVL2 read |
| 728 | because chipsets cannot guarantee that STPCLK# signal |
| 729 | gets asserted in time to freeze execution properly. */ |
Andi Kleen | cfa806f | 2010-07-20 15:18:36 -0700 | [diff] [blame^] | 730 | inl(acpi_gbl_FADT.xpm_timer_block.address); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 731 | } |
Steven Rostedt | dcf30997 | 2008-07-25 18:00:42 -0400 | [diff] [blame] | 732 | start_critical_timings(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 733 | } |
| 734 | |
| 735 | /** |
| 736 | * acpi_idle_enter_c1 - enters an ACPI C1 state-type |
| 737 | * @dev: the target CPU |
| 738 | * @state: the state data |
| 739 | * |
| 740 | * This is equivalent to the HALT instruction. |
| 741 | */ |
| 742 | static int acpi_idle_enter_c1(struct cpuidle_device *dev, |
| 743 | struct cpuidle_state *state) |
| 744 | { |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 745 | ktime_t kt1, kt2; |
| 746 | s64 idle_time; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 747 | struct acpi_processor *pr; |
| 748 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
venkatesh.pallipadi@intel.com | 9b12e18 | 2008-01-31 17:35:05 -0800 | [diff] [blame] | 749 | |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 750 | pr = __get_cpu_var(processors); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 751 | |
| 752 | if (unlikely(!pr)) |
| 753 | return 0; |
| 754 | |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 755 | local_irq_disable(); |
Venkatesh Pallipadi | b077fba | 2008-02-11 15:20:27 -0800 | [diff] [blame] | 756 | |
| 757 | /* Do not access any ACPI IO ports in suspend path */ |
| 758 | if (acpi_idle_suspend) { |
Venkatesh Pallipadi | b077fba | 2008-02-11 15:20:27 -0800 | [diff] [blame] | 759 | local_irq_enable(); |
Shaohua Li | 7d60e8a | 2009-05-19 16:09:54 +0800 | [diff] [blame] | 760 | cpu_relax(); |
Venkatesh Pallipadi | b077fba | 2008-02-11 15:20:27 -0800 | [diff] [blame] | 761 | return 0; |
| 762 | } |
| 763 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 764 | lapic_timer_state_broadcast(pr, cx, 1); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 765 | kt1 = ktime_get_real(); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 766 | acpi_idle_do_entry(cx); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 767 | kt2 = ktime_get_real(); |
| 768 | idle_time = ktime_to_us(ktime_sub(kt2, kt1)); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 769 | |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 770 | local_irq_enable(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 771 | cx->usage++; |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 772 | lapic_timer_state_broadcast(pr, cx, 0); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 773 | |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 774 | return idle_time; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 775 | } |
| 776 | |
| 777 | /** |
| 778 | * acpi_idle_enter_simple - enters an ACPI state without BM handling |
| 779 | * @dev: the target CPU |
| 780 | * @state: the state data |
| 781 | */ |
| 782 | static int acpi_idle_enter_simple(struct cpuidle_device *dev, |
| 783 | struct cpuidle_state *state) |
| 784 | { |
| 785 | struct acpi_processor *pr; |
| 786 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 787 | ktime_t kt1, kt2; |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 788 | s64 idle_time_ns; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 789 | s64 idle_time; |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 790 | |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 791 | pr = __get_cpu_var(processors); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 792 | |
| 793 | if (unlikely(!pr)) |
| 794 | return 0; |
| 795 | |
Len Brown | e196441 | 2007-10-04 01:23:47 -0400 | [diff] [blame] | 796 | if (acpi_idle_suspend) |
| 797 | return(acpi_idle_enter_c1(dev, state)); |
| 798 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 799 | local_irq_disable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 800 | |
Pallipadi, Venkatesh | d306ebc | 2010-02-10 10:35:31 -0800 | [diff] [blame] | 801 | if (cx->entry_method != ACPI_CSTATE_FFH) { |
| 802 | current_thread_info()->status &= ~TS_POLLING; |
| 803 | /* |
| 804 | * TS_POLLING-cleared state must be visible before we test |
| 805 | * NEED_RESCHED: |
| 806 | */ |
| 807 | smp_mb(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 808 | |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 809 | if (unlikely(need_resched())) { |
| 810 | current_thread_info()->status |= TS_POLLING; |
| 811 | local_irq_enable(); |
| 812 | return 0; |
| 813 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 814 | } |
| 815 | |
Thomas Gleixner | e17bcb4 | 2007-12-07 19:16:17 +0100 | [diff] [blame] | 816 | /* |
| 817 | * Must be done before busmaster disable as we might need to |
| 818 | * access HPET ! |
| 819 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 820 | lapic_timer_state_broadcast(pr, cx, 1); |
Thomas Gleixner | e17bcb4 | 2007-12-07 19:16:17 +0100 | [diff] [blame] | 821 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 822 | if (cx->type == ACPI_STATE_C3) |
| 823 | ACPI_FLUSH_CPU_CACHE(); |
| 824 | |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 825 | kt1 = ktime_get_real(); |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 826 | /* Tell the scheduler that we are going deep-idle: */ |
| 827 | sched_clock_idle_sleep_event(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 828 | acpi_idle_do_entry(cx); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 829 | kt2 = ktime_get_real(); |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 830 | idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1)); |
| 831 | idle_time = idle_time_ns; |
| 832 | do_div(idle_time, NSEC_PER_USEC); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 833 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 834 | /* Tell the scheduler how much we idled: */ |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 835 | sched_clock_idle_wakeup_event(idle_time_ns); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 836 | |
| 837 | local_irq_enable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 838 | if (cx->entry_method != ACPI_CSTATE_FFH) |
| 839 | current_thread_info()->status |= TS_POLLING; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 840 | |
| 841 | cx->usage++; |
| 842 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 843 | lapic_timer_state_broadcast(pr, cx, 0); |
Venkatesh Pallipadi | bceefad | 2010-06-02 10:01:09 -0700 | [diff] [blame] | 844 | cx->time += idle_time; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 845 | return idle_time; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | static int c3_cpu_count; |
| 849 | static DEFINE_SPINLOCK(c3_lock); |
| 850 | |
| 851 | /** |
| 852 | * acpi_idle_enter_bm - enters C3 with proper BM handling |
| 853 | * @dev: the target CPU |
| 854 | * @state: the state data |
| 855 | * |
| 856 | * If BM is detected, the deepest non-C3 idle state is entered instead. |
| 857 | */ |
| 858 | static int acpi_idle_enter_bm(struct cpuidle_device *dev, |
| 859 | struct cpuidle_state *state) |
| 860 | { |
| 861 | struct acpi_processor *pr; |
| 862 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 863 | ktime_t kt1, kt2; |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 864 | s64 idle_time_ns; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 865 | s64 idle_time; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 866 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 867 | |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 868 | pr = __get_cpu_var(processors); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 869 | |
| 870 | if (unlikely(!pr)) |
| 871 | return 0; |
| 872 | |
Len Brown | e196441 | 2007-10-04 01:23:47 -0400 | [diff] [blame] | 873 | if (acpi_idle_suspend) |
| 874 | return(acpi_idle_enter_c1(dev, state)); |
| 875 | |
Len Brown | 718be4a | 2010-07-22 16:54:27 -0400 | [diff] [blame] | 876 | if (!cx->bm_sts_skip && acpi_idle_bm_check()) { |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 877 | if (dev->safe_state) { |
Venkatesh Pallipadi | addbad4 | 2008-09-29 15:24:28 -0700 | [diff] [blame] | 878 | dev->last_state = dev->safe_state; |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 879 | return dev->safe_state->enter(dev, dev->safe_state); |
| 880 | } else { |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 881 | local_irq_disable(); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 882 | acpi_safe_halt(); |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 883 | local_irq_enable(); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 884 | return 0; |
| 885 | } |
| 886 | } |
| 887 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 888 | local_irq_disable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 889 | |
Pallipadi, Venkatesh | d306ebc | 2010-02-10 10:35:31 -0800 | [diff] [blame] | 890 | if (cx->entry_method != ACPI_CSTATE_FFH) { |
| 891 | current_thread_info()->status &= ~TS_POLLING; |
| 892 | /* |
| 893 | * TS_POLLING-cleared state must be visible before we test |
| 894 | * NEED_RESCHED: |
| 895 | */ |
| 896 | smp_mb(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 897 | |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 898 | if (unlikely(need_resched())) { |
| 899 | current_thread_info()->status |= TS_POLLING; |
| 900 | local_irq_enable(); |
| 901 | return 0; |
| 902 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 903 | } |
| 904 | |
Venki Pallipadi | 996520c | 2008-03-24 14:24:10 -0700 | [diff] [blame] | 905 | acpi_unlazy_tlb(smp_processor_id()); |
| 906 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 907 | /* Tell the scheduler that we are going deep-idle: */ |
| 908 | sched_clock_idle_sleep_event(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 909 | /* |
| 910 | * Must be done before busmaster disable as we might need to |
| 911 | * access HPET ! |
| 912 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 913 | lapic_timer_state_broadcast(pr, cx, 1); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 914 | |
Len Brown | f461dde | 2009-04-23 18:59:43 -0400 | [diff] [blame] | 915 | kt1 = ktime_get_real(); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 916 | /* |
| 917 | * disable bus master |
| 918 | * bm_check implies we need ARB_DIS |
| 919 | * !bm_check implies we need cache flush |
| 920 | * bm_control implies whether we can do ARB_DIS |
| 921 | * |
| 922 | * That leaves a case where bm_check is set and bm_control is |
| 923 | * not set. In that case we cannot do much, we enter C3 |
| 924 | * without doing anything. |
| 925 | */ |
| 926 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 927 | spin_lock(&c3_lock); |
| 928 | c3_cpu_count++; |
| 929 | /* Disable bus master arbitration when all CPUs are in C3 */ |
| 930 | if (c3_cpu_count == num_online_cpus()) |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 931 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 932 | spin_unlock(&c3_lock); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 933 | } else if (!pr->flags.bm_check) { |
| 934 | ACPI_FLUSH_CPU_CACHE(); |
| 935 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 936 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 937 | acpi_idle_do_entry(cx); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 938 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 939 | /* Re-enable bus master arbitration */ |
| 940 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 941 | spin_lock(&c3_lock); |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 942 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 943 | c3_cpu_count--; |
| 944 | spin_unlock(&c3_lock); |
| 945 | } |
Len Brown | f461dde | 2009-04-23 18:59:43 -0400 | [diff] [blame] | 946 | kt2 = ktime_get_real(); |
Zhao Yakui | 157317b | 2010-06-02 11:04:09 +0800 | [diff] [blame] | 947 | idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1)); |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 948 | idle_time = idle_time_ns; |
| 949 | do_div(idle_time, NSEC_PER_USEC); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 950 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 951 | /* Tell the scheduler how much we idled: */ |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 952 | sched_clock_idle_wakeup_event(idle_time_ns); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 953 | |
| 954 | local_irq_enable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 955 | if (cx->entry_method != ACPI_CSTATE_FFH) |
| 956 | current_thread_info()->status |= TS_POLLING; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 957 | |
| 958 | cx->usage++; |
| 959 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 960 | lapic_timer_state_broadcast(pr, cx, 0); |
Venkatesh Pallipadi | bceefad | 2010-06-02 10:01:09 -0700 | [diff] [blame] | 961 | cx->time += idle_time; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 962 | return idle_time; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 963 | } |
| 964 | |
| 965 | struct cpuidle_driver acpi_idle_driver = { |
| 966 | .name = "acpi_idle", |
| 967 | .owner = THIS_MODULE, |
| 968 | }; |
| 969 | |
| 970 | /** |
| 971 | * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE |
| 972 | * @pr: the ACPI processor |
| 973 | */ |
| 974 | static int acpi_processor_setup_cpuidle(struct acpi_processor *pr) |
| 975 | { |
venkatesh.pallipadi@intel.com | 9a0b841 | 2008-01-31 17:35:06 -0800 | [diff] [blame] | 976 | int i, count = CPUIDLE_DRIVER_STATE_START; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 977 | struct acpi_processor_cx *cx; |
| 978 | struct cpuidle_state *state; |
| 979 | struct cpuidle_device *dev = &pr->power.dev; |
| 980 | |
| 981 | if (!pr->flags.power_setup_done) |
| 982 | return -EINVAL; |
| 983 | |
| 984 | if (pr->flags.power == 0) { |
| 985 | return -EINVAL; |
| 986 | } |
| 987 | |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 988 | dev->cpu = pr->id; |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 989 | for (i = 0; i < CPUIDLE_STATE_MAX; i++) { |
| 990 | dev->states[i].name[0] = '\0'; |
| 991 | dev->states[i].desc[0] = '\0'; |
| 992 | } |
| 993 | |
Len Brown | 615dfd9 | 2009-04-23 23:21:29 -0400 | [diff] [blame] | 994 | if (max_cstate == 0) |
| 995 | max_cstate = 1; |
| 996 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 997 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
| 998 | cx = &pr->power.states[i]; |
| 999 | state = &dev->states[count]; |
| 1000 | |
| 1001 | if (!cx->valid) |
| 1002 | continue; |
| 1003 | |
| 1004 | #ifdef CONFIG_HOTPLUG_CPU |
| 1005 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
| 1006 | !pr->flags.has_cst && |
| 1007 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
| 1008 | continue; |
| 1009 | #endif |
| 1010 | cpuidle_set_statedata(state, cx); |
| 1011 | |
| 1012 | snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 1013 | strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1014 | state->exit_latency = cx->latency; |
Len Brown | 4963f62 | 2007-12-13 23:50:45 -0500 | [diff] [blame] | 1015 | state->target_residency = cx->latency * latency_factor; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1016 | state->power_usage = cx->power; |
| 1017 | |
| 1018 | state->flags = 0; |
| 1019 | switch (cx->type) { |
| 1020 | case ACPI_STATE_C1: |
| 1021 | state->flags |= CPUIDLE_FLAG_SHALLOW; |
Venki Pallipadi | 8e92b66 | 2008-02-29 10:24:32 -0800 | [diff] [blame] | 1022 | if (cx->entry_method == ACPI_CSTATE_FFH) |
| 1023 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1024 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1025 | state->enter = acpi_idle_enter_c1; |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1026 | dev->safe_state = state; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1027 | break; |
| 1028 | |
| 1029 | case ACPI_STATE_C2: |
| 1030 | state->flags |= CPUIDLE_FLAG_BALANCED; |
| 1031 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1032 | state->enter = acpi_idle_enter_simple; |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1033 | dev->safe_state = state; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1034 | break; |
| 1035 | |
| 1036 | case ACPI_STATE_C3: |
| 1037 | state->flags |= CPUIDLE_FLAG_DEEP; |
| 1038 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1039 | state->flags |= CPUIDLE_FLAG_CHECK_BM; |
| 1040 | state->enter = pr->flags.bm_check ? |
| 1041 | acpi_idle_enter_bm : |
| 1042 | acpi_idle_enter_simple; |
| 1043 | break; |
| 1044 | } |
| 1045 | |
| 1046 | count++; |
venkatesh.pallipadi@intel.com | 9a0b841 | 2008-01-31 17:35:06 -0800 | [diff] [blame] | 1047 | if (count == CPUIDLE_STATE_MAX) |
| 1048 | break; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1049 | } |
| 1050 | |
| 1051 | dev->state_count = count; |
| 1052 | |
| 1053 | if (!count) |
| 1054 | return -EINVAL; |
| 1055 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1056 | return 0; |
| 1057 | } |
| 1058 | |
| 1059 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
| 1060 | { |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1061 | int ret = 0; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1062 | |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1063 | if (boot_option_idle_override) |
| 1064 | return 0; |
| 1065 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1066 | if (!pr) |
| 1067 | return -EINVAL; |
| 1068 | |
| 1069 | if (nocst) { |
| 1070 | return -ENODEV; |
| 1071 | } |
| 1072 | |
| 1073 | if (!pr->flags.power_setup_done) |
| 1074 | return -ENODEV; |
| 1075 | |
| 1076 | cpuidle_pause_and_lock(); |
| 1077 | cpuidle_disable_device(&pr->power.dev); |
| 1078 | acpi_processor_get_power_info(pr); |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1079 | if (pr->flags.power) { |
| 1080 | acpi_processor_setup_cpuidle(pr); |
| 1081 | ret = cpuidle_enable_device(&pr->power.dev); |
| 1082 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1083 | cpuidle_resume_and_unlock(); |
| 1084 | |
| 1085 | return ret; |
| 1086 | } |
| 1087 | |
Pierre Ossman | 7af8b66 | 2006-10-10 14:20:31 -0700 | [diff] [blame] | 1088 | int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1089 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1091 | acpi_status status = 0; |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 1092 | static int first_run; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1094 | if (boot_option_idle_override) |
| 1095 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | |
| 1097 | if (!first_run) { |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 1098 | if (idle_halt) { |
| 1099 | /* |
| 1100 | * When the boot option of "idle=halt" is added, halt |
| 1101 | * is used for CPU IDLE. |
| 1102 | * In such case C2/C3 is meaningless. So the max_cstate |
| 1103 | * is set to one. |
| 1104 | */ |
| 1105 | max_cstate = 1; |
| 1106 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | dmi_check_system(processor_power_dmi_table); |
Alexey Starikovskiy | c1c3063 | 2007-11-26 20:42:19 +0100 | [diff] [blame] | 1108 | max_cstate = acpi_processor_cstate_check(max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | if (max_cstate < ACPI_C_STATES_MAX) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1110 | printk(KERN_NOTICE |
| 1111 | "ACPI: processor limited to max C-state %d\n", |
| 1112 | max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | first_run++; |
| 1114 | } |
| 1115 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1116 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1117 | return -EINVAL; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1118 | |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1119 | if (acpi_gbl_FADT.cst_control && !nocst) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1120 | status = |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1121 | acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1123 | ACPI_EXCEPTION((AE_INFO, status, |
| 1124 | "Notifying BIOS of _CST ability failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | } |
| 1126 | } |
| 1127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | acpi_processor_get_power_info(pr); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1129 | pr->flags.power_setup_done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | |
| 1131 | /* |
| 1132 | * Install the idle handler if processor power management is supported. |
| 1133 | * Note that we use previously set idle handler will be used on |
| 1134 | * platforms that only support C1. |
| 1135 | */ |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1136 | if (pr->flags.power) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1137 | acpi_processor_setup_cpuidle(pr); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1138 | if (cpuidle_register_device(&pr->power.dev)) |
| 1139 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | } |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1141 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | } |
| 1143 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1144 | int acpi_processor_power_exit(struct acpi_processor *pr, |
| 1145 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | { |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1147 | if (boot_option_idle_override) |
| 1148 | return 0; |
| 1149 | |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1150 | cpuidle_unregister_device(&pr->power.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | pr->flags.power_setup_done = 0; |
| 1152 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1153 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | } |