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"); |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 67 | #define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 68 | #define C2_OVERHEAD 1 /* 1us */ |
| 69 | #define C3_OVERHEAD 1 /* 1us */ |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 70 | #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] | 71 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 72 | static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; |
| 73 | module_param(max_cstate, uint, 0000); |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 74 | static unsigned int nocst __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | module_param(nocst, uint, 0000); |
Len Brown | d3e7e99 | 2010-07-22 17:23:10 -0400 | [diff] [blame] | 76 | static int bm_check_disable __read_mostly; |
| 77 | module_param(bm_check_disable, uint, 0000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Len Brown | 25de571 | 2007-12-14 00:24:15 -0500 | [diff] [blame] | 79 | static unsigned int latency_factor __read_mostly = 2; |
Len Brown | 4963f62 | 2007-12-13 23:50:45 -0500 | [diff] [blame] | 80 | module_param(latency_factor, uint, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 82 | static int disabled_by_idle_boot_param(void) |
| 83 | { |
| 84 | return boot_option_idle_override == IDLE_POLL || |
| 85 | boot_option_idle_override == IDLE_FORCE_MWAIT || |
| 86 | boot_option_idle_override == IDLE_HALT; |
| 87 | } |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | /* |
| 90 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. |
| 91 | * For now disable this. Probably a bug somewhere else. |
| 92 | * |
| 93 | * To skip this limit, boot/load with a large max_cstate limit. |
| 94 | */ |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 95 | static int set_max_cstate(const struct dmi_system_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
| 97 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) |
| 98 | return 0; |
| 99 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 100 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 101 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
| 102 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 104 | max_cstate = (long)id->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
Ashok Raj | 7ded568 | 2006-02-03 21:51:23 +0100 | [diff] [blame] | 109 | /* Actually this shouldn't be __cpuinitdata, would be better to fix the |
| 110 | callers to only run once -AK */ |
| 111 | static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 112 | { set_max_cstate, "Clevo 5600D", { |
| 113 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 114 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 115 | (void *)2}, |
Arjan van de Ven | 370d5cd | 2010-01-27 15:25:39 -0800 | [diff] [blame] | 116 | { set_max_cstate, "Pavilion zv5000", { |
| 117 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
| 118 | DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")}, |
| 119 | (void *)1}, |
| 120 | { set_max_cstate, "Asus L8400B", { |
| 121 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), |
| 122 | DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")}, |
| 123 | (void *)1}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | {}, |
| 125 | }; |
| 126 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 127 | |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 128 | /* |
| 129 | * Callers should disable interrupts before the call and enable |
| 130 | * interrupts after return. |
| 131 | */ |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 132 | static void acpi_safe_halt(void) |
| 133 | { |
| 134 | current_thread_info()->status &= ~TS_POLLING; |
| 135 | /* |
| 136 | * TS_POLLING-cleared state must be visible before we |
| 137 | * test NEED_RESCHED: |
| 138 | */ |
| 139 | smp_mb(); |
Venki Pallipadi | 71e93d1 | 2008-03-13 17:18:19 -0700 | [diff] [blame] | 140 | if (!need_resched()) { |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 141 | safe_halt(); |
Venki Pallipadi | 71e93d1 | 2008-03-13 17:18:19 -0700 | [diff] [blame] | 142 | local_irq_disable(); |
| 143 | } |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 144 | current_thread_info()->status |= TS_POLLING; |
| 145 | } |
| 146 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 147 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
| 148 | |
| 149 | /* |
| 150 | * Some BIOS implementations switch to C3 in the published C2 state. |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 151 | * This seems to be a common problem on AMD boxen, but other vendors |
| 152 | * are affected too. We pick the most conservative approach: we assume |
| 153 | * that the local APIC stops in both C2 and C3. |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 154 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 155 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 156 | struct acpi_processor_cx *cx) |
| 157 | { |
| 158 | struct acpi_processor_power *pwr = &pr->power; |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 159 | 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] | 160 | |
Venkatesh Pallipadi | db954b5 | 2009-04-06 18:51:29 -0700 | [diff] [blame] | 161 | if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT)) |
| 162 | return; |
| 163 | |
Len Brown | 02c68a0 | 2011-04-01 16:59:53 -0400 | [diff] [blame] | 164 | if (amd_e400_c1e_detected) |
Shaohua Li | 87ad57b | 2009-05-19 16:09:42 +0800 | [diff] [blame] | 165 | type = ACPI_STATE_C1; |
| 166 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 167 | /* |
| 168 | * Check, if one of the previous states already marked the lapic |
| 169 | * unstable |
| 170 | */ |
| 171 | if (pwr->timer_broadcast_on_state < state) |
| 172 | return; |
| 173 | |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 174 | if (cx->type >= type) |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 175 | pr->power.timer_broadcast_on_state = state; |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 176 | } |
| 177 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 178 | static void __lapic_timer_propagate_broadcast(void *arg) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 179 | { |
Suresh Siddha | f833bab | 2009-08-17 14:34:59 -0700 | [diff] [blame] | 180 | struct acpi_processor *pr = (struct acpi_processor *) arg; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 181 | unsigned long reason; |
| 182 | |
| 183 | reason = pr->power.timer_broadcast_on_state < INT_MAX ? |
| 184 | CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; |
| 185 | |
| 186 | clockevents_notify(reason, &pr->id); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 187 | } |
| 188 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 189 | static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) |
| 190 | { |
| 191 | smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast, |
| 192 | (void *)pr, 1); |
| 193 | } |
| 194 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 195 | /* Power(C) State timer broadcast control */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 196 | static void lapic_timer_state_broadcast(struct acpi_processor *pr, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 197 | struct acpi_processor_cx *cx, |
| 198 | int broadcast) |
| 199 | { |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 200 | int state = cx - pr->power.states; |
| 201 | |
| 202 | if (state >= pr->power.timer_broadcast_on_state) { |
| 203 | unsigned long reason; |
| 204 | |
| 205 | reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : |
| 206 | CLOCK_EVT_NOTIFY_BROADCAST_EXIT; |
| 207 | clockevents_notify(reason, &pr->id); |
| 208 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | #else |
| 212 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 213 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 214 | struct acpi_processor_cx *cstate) { } |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 215 | static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { } |
| 216 | static void lapic_timer_state_broadcast(struct acpi_processor *pr, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 217 | struct acpi_processor_cx *cx, |
| 218 | int broadcast) |
| 219 | { |
| 220 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 221 | |
| 222 | #endif |
| 223 | |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 224 | /* |
| 225 | * Suspend / resume control |
| 226 | */ |
| 227 | static int acpi_idle_suspend; |
Len Brown | 815ab0f | 2009-05-07 22:19:45 -0400 | [diff] [blame] | 228 | static u32 saved_bm_rld; |
| 229 | |
| 230 | static void acpi_idle_bm_rld_save(void) |
| 231 | { |
| 232 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); |
| 233 | } |
| 234 | static void acpi_idle_bm_rld_restore(void) |
| 235 | { |
| 236 | u32 resumed_bm_rld; |
| 237 | |
| 238 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); |
| 239 | |
| 240 | if (resumed_bm_rld != saved_bm_rld) |
| 241 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); |
| 242 | } |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 243 | |
| 244 | int acpi_processor_suspend(struct acpi_device * device, pm_message_t state) |
| 245 | { |
Len Brown | 815ab0f | 2009-05-07 22:19:45 -0400 | [diff] [blame] | 246 | if (acpi_idle_suspend == 1) |
| 247 | return 0; |
| 248 | |
| 249 | acpi_idle_bm_rld_save(); |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 250 | acpi_idle_suspend = 1; |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | int acpi_processor_resume(struct acpi_device * device) |
| 255 | { |
Len Brown | 815ab0f | 2009-05-07 22:19:45 -0400 | [diff] [blame] | 256 | if (acpi_idle_suspend == 0) |
| 257 | return 0; |
| 258 | |
| 259 | acpi_idle_bm_rld_restore(); |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 260 | acpi_idle_suspend = 0; |
| 261 | return 0; |
| 262 | } |
| 263 | |
John Stultz | 592913e | 2010-07-13 17:56:20 -0700 | [diff] [blame] | 264 | #if defined(CONFIG_X86) |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 265 | static void tsc_check_state(int state) |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 266 | { |
| 267 | switch (boot_cpu_data.x86_vendor) { |
| 268 | case X86_VENDOR_AMD: |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 269 | case X86_VENDOR_INTEL: |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 270 | /* |
| 271 | * AMD Fam10h TSC will tick in all |
| 272 | * C/P/S0/S1 states when this bit is set. |
| 273 | */ |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 274 | if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 275 | return; |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 276 | |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 277 | /*FALL THROUGH*/ |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 278 | default: |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 279 | /* TSC could halt in idle, so notify users */ |
| 280 | if (state > ACPI_STATE_C1) |
| 281 | mark_tsc_unstable("TSC halts in idle"); |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 282 | } |
| 283 | } |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 284 | #else |
| 285 | static void tsc_check_state(int state) { return; } |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 286 | #endif |
| 287 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 288 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
| 291 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 292 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
| 294 | if (!pr->pblk) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 295 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | /* if info is obtained from pblk/fadt, type equals state */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
| 299 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; |
| 300 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 301 | #ifndef CONFIG_HOTPLUG_CPU |
| 302 | /* |
| 303 | * Check for P_LVL2_UP flag before entering C2 and above on |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 304 | * an SMP system. |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 305 | */ |
Alexey Starikovskiy | ad71860 | 2007-02-02 19:48:19 +0300 | [diff] [blame] | 306 | if ((num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 307 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 308 | return -ENODEV; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 309 | #endif |
| 310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | /* determine C2 and C3 address from pblk */ |
| 312 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; |
| 313 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; |
| 314 | |
| 315 | /* determine latencies from FADT */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 316 | pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency; |
| 317 | pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Len Brown | 5d76b6f | 2010-01-19 22:41:14 -0500 | [diff] [blame] | 319 | /* |
| 320 | * FADT specified C2 latency must be less than or equal to |
| 321 | * 100 microseconds. |
| 322 | */ |
| 323 | if (acpi_gbl_FADT.C2latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { |
| 324 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 325 | "C2 latency too large [%d]\n", acpi_gbl_FADT.C2latency)); |
| 326 | /* invalidate C2 */ |
| 327 | pr->power.states[ACPI_STATE_C2].address = 0; |
| 328 | } |
| 329 | |
Len Brown | a6d72c1 | 2010-01-19 23:10:04 -0500 | [diff] [blame] | 330 | /* |
| 331 | * FADT supplied C3 latency must be less than or equal to |
| 332 | * 1000 microseconds. |
| 333 | */ |
| 334 | if (acpi_gbl_FADT.C3latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { |
| 335 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 336 | "C3 latency too large [%d]\n", acpi_gbl_FADT.C3latency)); |
| 337 | /* invalidate C3 */ |
| 338 | pr->power.states[ACPI_STATE_C3].address = 0; |
| 339 | } |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 342 | "lvl2[0x%08x] lvl3[0x%08x]\n", |
| 343 | pr->power.states[ACPI_STATE_C2].address, |
| 344 | pr->power.states[ACPI_STATE_C3].address)); |
| 345 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 346 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | } |
| 348 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 349 | static int acpi_processor_get_power_info_default(struct acpi_processor *pr) |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 350 | { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 351 | if (!pr->power.states[ACPI_STATE_C1].valid) { |
| 352 | /* set the first C-State to C1 */ |
| 353 | /* all processors need to support C1 */ |
| 354 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; |
| 355 | pr->power.states[ACPI_STATE_C1].valid = 1; |
Venkatesh Pallipadi | 0fda6b4 | 2008-04-09 21:31:46 -0400 | [diff] [blame] | 356 | pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 357 | } |
| 358 | /* the C0 state only exists as a filler in our array */ |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 359 | pr->power.states[ACPI_STATE_C0].valid = 1; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 360 | return 0; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 361 | } |
| 362 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 363 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 365 | acpi_status status = 0; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 366 | u64 count; |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 367 | int current_count; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 368 | int i; |
| 369 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 370 | union acpi_object *cst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | if (nocst) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 374 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 376 | current_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
| 378 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); |
| 379 | if (ACPI_FAILURE(status)) { |
| 380 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 381 | return -ENODEV; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 382 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 384 | cst = buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
| 386 | /* There must be at least 2 elements */ |
| 387 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 388 | printk(KERN_ERR PREFIX "not enough elements in _CST\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | status = -EFAULT; |
| 390 | goto end; |
| 391 | } |
| 392 | |
| 393 | count = cst->package.elements[0].integer.value; |
| 394 | |
| 395 | /* Validate number of power states. */ |
| 396 | if (count < 1 || count != cst->package.count - 1) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 397 | printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | status = -EFAULT; |
| 399 | goto end; |
| 400 | } |
| 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | /* Tell driver that at least _CST is supported. */ |
| 403 | pr->flags.has_cst = 1; |
| 404 | |
| 405 | for (i = 1; i <= count; i++) { |
| 406 | union acpi_object *element; |
| 407 | union acpi_object *obj; |
| 408 | struct acpi_power_register *reg; |
| 409 | struct acpi_processor_cx cx; |
| 410 | |
| 411 | memset(&cx, 0, sizeof(cx)); |
| 412 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 413 | element = &(cst->package.elements[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | if (element->type != ACPI_TYPE_PACKAGE) |
| 415 | continue; |
| 416 | |
| 417 | if (element->package.count != 4) |
| 418 | continue; |
| 419 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 420 | obj = &(element->package.elements[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
| 422 | if (obj->type != ACPI_TYPE_BUFFER) |
| 423 | continue; |
| 424 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 425 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
| 427 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 428 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | continue; |
| 430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | /* There should be an easy way to extract an integer... */ |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 432 | obj = &(element->package.elements[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | if (obj->type != ACPI_TYPE_INTEGER) |
| 434 | continue; |
| 435 | |
| 436 | cx.type = obj->integer.value; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 437 | /* |
| 438 | * Some buggy BIOSes won't list C1 in _CST - |
| 439 | * Let acpi_processor_get_power_info_default() handle them later |
| 440 | */ |
| 441 | if (i == 1 && cx.type != ACPI_STATE_C1) |
| 442 | current_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 444 | cx.address = reg->address; |
| 445 | cx.index = current_count + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 447 | cx.entry_method = ACPI_CSTATE_SYSTEMIO; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 448 | if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { |
| 449 | if (acpi_processor_ffh_cstate_probe |
| 450 | (pr->id, &cx, reg) == 0) { |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 451 | cx.entry_method = ACPI_CSTATE_FFH; |
| 452 | } else if (cx.type == ACPI_STATE_C1) { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 453 | /* |
| 454 | * C1 is a special case where FIXED_HARDWARE |
| 455 | * can be handled in non-MWAIT way as well. |
| 456 | * In that case, save this _CST entry info. |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 457 | * Otherwise, ignore this info and continue. |
| 458 | */ |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 459 | cx.entry_method = ACPI_CSTATE_HALT; |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 460 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 461 | } else { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 462 | continue; |
| 463 | } |
Zhao Yakui | da5e09a | 2008-06-24 18:01:09 +0800 | [diff] [blame] | 464 | if (cx.type == ACPI_STATE_C1 && |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 465 | (boot_option_idle_override == IDLE_NOMWAIT)) { |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 466 | /* |
| 467 | * In most cases the C1 space_id obtained from |
| 468 | * _CST object is FIXED_HARDWARE access mode. |
| 469 | * But when the option of idle=halt is added, |
| 470 | * the entry_method type should be changed from |
| 471 | * CSTATE_FFH to CSTATE_HALT. |
Zhao Yakui | da5e09a | 2008-06-24 18:01:09 +0800 | [diff] [blame] | 472 | * When the option of idle=nomwait is added, |
| 473 | * the C1 entry_method type should be |
| 474 | * CSTATE_HALT. |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 475 | */ |
| 476 | cx.entry_method = ACPI_CSTATE_HALT; |
| 477 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
| 478 | } |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 479 | } else { |
| 480 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", |
| 481 | cx.address); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 482 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
Venkatesh Pallipadi | 0fda6b4 | 2008-04-09 21:31:46 -0400 | [diff] [blame] | 484 | if (cx.type == ACPI_STATE_C1) { |
| 485 | cx.valid = 1; |
| 486 | } |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 487 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 488 | obj = &(element->package.elements[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | if (obj->type != ACPI_TYPE_INTEGER) |
| 490 | continue; |
| 491 | |
| 492 | cx.latency = obj->integer.value; |
| 493 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 494 | obj = &(element->package.elements[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | if (obj->type != ACPI_TYPE_INTEGER) |
| 496 | continue; |
| 497 | |
| 498 | cx.power = obj->integer.value; |
| 499 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 500 | current_count++; |
| 501 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); |
| 502 | |
| 503 | /* |
| 504 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 |
| 505 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) |
| 506 | */ |
| 507 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { |
| 508 | printk(KERN_WARNING |
| 509 | "Limiting number of power states to max (%d)\n", |
| 510 | ACPI_PROCESSOR_MAX_POWER); |
| 511 | printk(KERN_WARNING |
| 512 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); |
| 513 | break; |
| 514 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | } |
| 516 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 517 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 518 | current_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | |
| 520 | /* Validate number of power states discovered */ |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 521 | if (current_count < 2) |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 522 | status = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 524 | end: |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 525 | kfree(buffer.pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 527 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |
| 529 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 530 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
| 531 | struct acpi_processor_cx *cx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | { |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 533 | static int bm_check_flag = -1; |
| 534 | static int bm_control_flag = -1; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
| 537 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 538 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
| 540 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) |
| 542 | * DMA transfers are used by any ISA device to avoid livelock. |
| 543 | * Note that we could disable Type-F DMA (as recommended by |
| 544 | * the erratum), but this is known to disrupt certain ISA |
| 545 | * devices thus we take the conservative approach. |
| 546 | */ |
| 547 | else if (errata.piix4.fdma) { |
| 548 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 549 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 550 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 553 | /* 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] | 554 | if (bm_check_flag == -1) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 555 | /* Determine whether bm_check is needed based on CPU */ |
| 556 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); |
| 557 | bm_check_flag = pr->flags.bm_check; |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 558 | bm_control_flag = pr->flags.bm_control; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 559 | } else { |
| 560 | pr->flags.bm_check = bm_check_flag; |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 561 | pr->flags.bm_control = bm_control_flag; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 562 | } |
| 563 | |
| 564 | if (pr->flags.bm_check) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 565 | if (!pr->flags.bm_control) { |
Venki Pallipadi | ed3110e | 2007-07-31 12:04:31 -0700 | [diff] [blame] | 566 | if (pr->flags.has_cst != 1) { |
| 567 | /* bus mastering control is necessary */ |
| 568 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 569 | "C3 support requires BM control\n")); |
| 570 | return; |
| 571 | } else { |
| 572 | /* Here we enter C3 without bus mastering */ |
| 573 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 574 | "C3 support without BM control\n")); |
| 575 | } |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 576 | } |
| 577 | } else { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 578 | /* |
| 579 | * WBINVD should be set in fadt, for C3 state to be |
| 580 | * supported on when bm_check is not required. |
| 581 | */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 582 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 583 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 584 | "Cache invalidation should work properly" |
| 585 | " for C3 to be enabled on SMP systems\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 586 | return; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 587 | } |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 588 | } |
| 589 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | /* |
| 591 | * Otherwise we've met all of our C3 requirements. |
| 592 | * Normalize the C3 latency to expidite policy. Enable |
| 593 | * checking of bus mastering status (bm_check) so we can |
| 594 | * use this in our C3 policy |
| 595 | */ |
| 596 | cx->valid = 1; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 597 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 598 | cx->latency_ticks = cx->latency; |
Len Brown | 31878dd | 2009-01-28 18:28:09 -0500 | [diff] [blame] | 599 | /* |
| 600 | * On older chipsets, BM_RLD needs to be set |
| 601 | * in order for Bus Master activity to wake the |
| 602 | * system from C3. Newer chipsets handle DMA |
| 603 | * during C3 automatically and BM_RLD is a NOP. |
| 604 | * In either case, the proper way to |
| 605 | * handle BM_RLD is to set it and leave it set. |
| 606 | */ |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 607 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 609 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | } |
| 611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
| 613 | { |
| 614 | unsigned int i; |
| 615 | unsigned int working = 0; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 616 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 617 | pr->power.timer_broadcast_on_state = INT_MAX; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 618 | |
Len Brown | a0bf284 | 2009-05-15 01:29:31 -0400 | [diff] [blame] | 619 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
| 621 | |
| 622 | switch (cx->type) { |
| 623 | case ACPI_STATE_C1: |
| 624 | cx->valid = 1; |
| 625 | break; |
| 626 | |
| 627 | case ACPI_STATE_C2: |
Len Brown | d22edd2 | 2010-01-19 23:29:09 -0500 | [diff] [blame] | 628 | if (!cx->address) |
| 629 | break; |
| 630 | cx->valid = 1; |
| 631 | cx->latency_ticks = cx->latency; /* Normalize latency */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | break; |
| 633 | |
| 634 | case ACPI_STATE_C3: |
| 635 | acpi_processor_power_verify_c3(pr, cx); |
| 636 | break; |
| 637 | } |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 638 | if (!cx->valid) |
| 639 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 641 | lapic_timer_check_state(i, pr, cx); |
| 642 | tsc_check_state(cx->type); |
| 643 | working++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | } |
| 645 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 646 | lapic_timer_propagate_broadcast(pr); |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 647 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | return (working); |
| 649 | } |
| 650 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 651 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | { |
| 653 | unsigned int i; |
| 654 | int result; |
| 655 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
| 657 | /* NOTE: the idle thread may not be running while calling |
| 658 | * this function */ |
| 659 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 660 | /* Zero initialize all the C-states info. */ |
| 661 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
| 662 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | result = acpi_processor_get_power_info_cst(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 664 | if (result == -ENODEV) |
Darrick J. Wong | c5a114f | 2006-10-19 23:28:28 -0700 | [diff] [blame] | 665 | result = acpi_processor_get_power_info_fadt(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 666 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 667 | if (result) |
| 668 | return result; |
| 669 | |
| 670 | acpi_processor_get_power_info_default(pr); |
| 671 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 672 | pr->power.count = acpi_processor_power_verify(pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | /* |
| 675 | * if one state of type C2 or C3 is available, mark this |
| 676 | * CPU as being "idle manageable" |
| 677 | */ |
| 678 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 679 | if (pr->power.states[i].valid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | pr->power.count = i; |
Linus Torvalds | 2203d6e | 2005-11-18 07:29:51 -0800 | [diff] [blame] | 681 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
| 682 | pr->flags.power = 1; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 683 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | } |
| 685 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 686 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | } |
| 688 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 689 | /** |
| 690 | * acpi_idle_bm_check - checks if bus master activity was detected |
| 691 | */ |
| 692 | static int acpi_idle_bm_check(void) |
| 693 | { |
| 694 | u32 bm_status = 0; |
| 695 | |
Len Brown | d3e7e99 | 2010-07-22 17:23:10 -0400 | [diff] [blame] | 696 | if (bm_check_disable) |
| 697 | return 0; |
| 698 | |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 699 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 700 | if (bm_status) |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 701 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 702 | /* |
| 703 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect |
| 704 | * the true state of bus mastering activity; forcing us to |
| 705 | * manually check the BMIDEA bit of each IDE channel. |
| 706 | */ |
| 707 | else if (errata.piix4.bmisx) { |
| 708 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) |
| 709 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
| 710 | bm_status = 1; |
| 711 | } |
| 712 | return bm_status; |
| 713 | } |
| 714 | |
| 715 | /** |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 716 | * acpi_idle_do_entry - a helper function that does C2 and C3 type entry |
| 717 | * @cx: cstate data |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 718 | * |
| 719 | * Caller disables interrupt before call and enables interrupt after return. |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 720 | */ |
| 721 | static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) |
| 722 | { |
Steven Rostedt | dcf3099 | 2008-07-25 18:00:42 -0400 | [diff] [blame] | 723 | /* Don't trace irqs off for idle */ |
| 724 | stop_critical_timings(); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 725 | if (cx->entry_method == ACPI_CSTATE_FFH) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 726 | /* Call into architectural FFH based C-state */ |
| 727 | acpi_processor_ffh_cstate_enter(cx); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 728 | } else if (cx->entry_method == ACPI_CSTATE_HALT) { |
| 729 | acpi_safe_halt(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 730 | } else { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 731 | /* IO port based C-state */ |
| 732 | inb(cx->address); |
| 733 | /* Dummy wait op - must do something useless after P_LVL2 read |
| 734 | because chipsets cannot guarantee that STPCLK# signal |
| 735 | gets asserted in time to freeze execution properly. */ |
Andi Kleen | cfa806f | 2010-07-20 15:18:36 -0700 | [diff] [blame] | 736 | inl(acpi_gbl_FADT.xpm_timer_block.address); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 737 | } |
Steven Rostedt | dcf3099 | 2008-07-25 18:00:42 -0400 | [diff] [blame] | 738 | start_critical_timings(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 739 | } |
| 740 | |
| 741 | /** |
| 742 | * acpi_idle_enter_c1 - enters an ACPI C1 state-type |
| 743 | * @dev: the target CPU |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 744 | * @index: index of target state |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 745 | * |
| 746 | * This is equivalent to the HALT instruction. |
| 747 | */ |
| 748 | static int acpi_idle_enter_c1(struct cpuidle_device *dev, |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 749 | int index) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 750 | { |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 751 | ktime_t kt1, kt2; |
| 752 | s64 idle_time; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 753 | struct acpi_processor *pr; |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 754 | struct cpuidle_state *state = &dev->states[index]; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 755 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
venkatesh.pallipadi@intel.com | 9b12e18 | 2008-01-31 17:35:05 -0800 | [diff] [blame] | 756 | |
Christoph Lameter | 4a6f4fe | 2010-12-06 11:16:24 -0600 | [diff] [blame] | 757 | pr = __this_cpu_read(processors); |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 758 | dev->last_residency = 0; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 759 | |
| 760 | if (unlikely(!pr)) |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 761 | return -EINVAL; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 762 | |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 763 | local_irq_disable(); |
Venkatesh Pallipadi | b077fba | 2008-02-11 15:20:27 -0800 | [diff] [blame] | 764 | |
| 765 | /* Do not access any ACPI IO ports in suspend path */ |
| 766 | if (acpi_idle_suspend) { |
Venkatesh Pallipadi | b077fba | 2008-02-11 15:20:27 -0800 | [diff] [blame] | 767 | local_irq_enable(); |
Shaohua Li | 7d60e8a | 2009-05-19 16:09:54 +0800 | [diff] [blame] | 768 | cpu_relax(); |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 769 | return -EINVAL; |
Venkatesh Pallipadi | b077fba | 2008-02-11 15:20:27 -0800 | [diff] [blame] | 770 | } |
| 771 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 772 | lapic_timer_state_broadcast(pr, cx, 1); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 773 | kt1 = ktime_get_real(); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 774 | acpi_idle_do_entry(cx); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 775 | kt2 = ktime_get_real(); |
| 776 | idle_time = ktime_to_us(ktime_sub(kt2, kt1)); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 777 | |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 778 | /* Update device last_residency*/ |
| 779 | dev->last_residency = (int)idle_time; |
| 780 | |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 781 | local_irq_enable(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 782 | cx->usage++; |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 783 | lapic_timer_state_broadcast(pr, cx, 0); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 784 | |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 785 | return index; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 786 | } |
| 787 | |
| 788 | /** |
| 789 | * acpi_idle_enter_simple - enters an ACPI state without BM handling |
| 790 | * @dev: the target CPU |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 791 | * @index: the index of suggested state |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 792 | */ |
| 793 | static int acpi_idle_enter_simple(struct cpuidle_device *dev, |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 794 | int index) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 795 | { |
| 796 | struct acpi_processor *pr; |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 797 | struct cpuidle_state *state = &dev->states[index]; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 798 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 799 | ktime_t kt1, kt2; |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 800 | s64 idle_time_ns; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 801 | s64 idle_time; |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 802 | |
Christoph Lameter | 4a6f4fe | 2010-12-06 11:16:24 -0600 | [diff] [blame] | 803 | pr = __this_cpu_read(processors); |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 804 | dev->last_residency = 0; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 805 | |
| 806 | if (unlikely(!pr)) |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 807 | return -EINVAL; |
Len Brown | e196441 | 2007-10-04 01:23:47 -0400 | [diff] [blame] | 808 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 809 | local_irq_disable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 810 | |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 811 | if (acpi_idle_suspend) { |
| 812 | local_irq_enable(); |
| 813 | cpu_relax(); |
| 814 | return -EINVAL; |
| 815 | } |
| 816 | |
| 817 | |
Pallipadi, Venkatesh | d306ebc | 2010-02-10 10:35:31 -0800 | [diff] [blame] | 818 | if (cx->entry_method != ACPI_CSTATE_FFH) { |
| 819 | current_thread_info()->status &= ~TS_POLLING; |
| 820 | /* |
| 821 | * TS_POLLING-cleared state must be visible before we test |
| 822 | * NEED_RESCHED: |
| 823 | */ |
| 824 | smp_mb(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 825 | |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 826 | if (unlikely(need_resched())) { |
| 827 | current_thread_info()->status |= TS_POLLING; |
| 828 | local_irq_enable(); |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 829 | return -EINVAL; |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 830 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 831 | } |
| 832 | |
Thomas Gleixner | e17bcb4 | 2007-12-07 19:16:17 +0100 | [diff] [blame] | 833 | /* |
| 834 | * Must be done before busmaster disable as we might need to |
| 835 | * access HPET ! |
| 836 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 837 | lapic_timer_state_broadcast(pr, cx, 1); |
Thomas Gleixner | e17bcb4 | 2007-12-07 19:16:17 +0100 | [diff] [blame] | 838 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 839 | if (cx->type == ACPI_STATE_C3) |
| 840 | ACPI_FLUSH_CPU_CACHE(); |
| 841 | |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 842 | kt1 = ktime_get_real(); |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 843 | /* Tell the scheduler that we are going deep-idle: */ |
| 844 | sched_clock_idle_sleep_event(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 845 | acpi_idle_do_entry(cx); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 846 | kt2 = ktime_get_real(); |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 847 | idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1)); |
| 848 | idle_time = idle_time_ns; |
| 849 | do_div(idle_time, NSEC_PER_USEC); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 850 | |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 851 | /* Update device last_residency*/ |
| 852 | dev->last_residency = (int)idle_time; |
| 853 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 854 | /* Tell the scheduler how much we idled: */ |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 855 | sched_clock_idle_wakeup_event(idle_time_ns); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 856 | |
| 857 | local_irq_enable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 858 | if (cx->entry_method != ACPI_CSTATE_FFH) |
| 859 | current_thread_info()->status |= TS_POLLING; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 860 | |
| 861 | cx->usage++; |
| 862 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 863 | lapic_timer_state_broadcast(pr, cx, 0); |
Venkatesh Pallipadi | bceefad | 2010-06-02 10:01:09 -0700 | [diff] [blame] | 864 | cx->time += idle_time; |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 865 | return index; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 866 | } |
| 867 | |
| 868 | static int c3_cpu_count; |
| 869 | static DEFINE_SPINLOCK(c3_lock); |
| 870 | |
| 871 | /** |
| 872 | * acpi_idle_enter_bm - enters C3 with proper BM handling |
| 873 | * @dev: the target CPU |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 874 | * @index: the index of suggested state |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 875 | * |
| 876 | * If BM is detected, the deepest non-C3 idle state is entered instead. |
| 877 | */ |
| 878 | static int acpi_idle_enter_bm(struct cpuidle_device *dev, |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 879 | int index) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 880 | { |
| 881 | struct acpi_processor *pr; |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 882 | struct cpuidle_state *state = &dev->states[index]; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 883 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 884 | ktime_t kt1, kt2; |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 885 | s64 idle_time_ns; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 886 | s64 idle_time; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 887 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 888 | |
Christoph Lameter | 4a6f4fe | 2010-12-06 11:16:24 -0600 | [diff] [blame] | 889 | pr = __this_cpu_read(processors); |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 890 | dev->last_residency = 0; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 891 | |
| 892 | if (unlikely(!pr)) |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 893 | return -EINVAL; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 894 | |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 895 | |
| 896 | if (acpi_idle_suspend) { |
| 897 | cpu_relax(); |
| 898 | return -EINVAL; |
| 899 | } |
Len Brown | e196441 | 2007-10-04 01:23:47 -0400 | [diff] [blame] | 900 | |
Len Brown | 718be4a | 2010-07-22 16:54:27 -0400 | [diff] [blame] | 901 | if (!cx->bm_sts_skip && acpi_idle_bm_check()) { |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 902 | if (dev->safe_state_index >= 0) { |
| 903 | return dev->states[dev->safe_state_index].enter(dev, |
| 904 | dev->safe_state_index); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 905 | } else { |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 906 | local_irq_disable(); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 907 | acpi_safe_halt(); |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 908 | local_irq_enable(); |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 909 | return -EINVAL; |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 910 | } |
| 911 | } |
| 912 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 913 | local_irq_disable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 914 | |
Pallipadi, Venkatesh | d306ebc | 2010-02-10 10:35:31 -0800 | [diff] [blame] | 915 | if (cx->entry_method != ACPI_CSTATE_FFH) { |
| 916 | current_thread_info()->status &= ~TS_POLLING; |
| 917 | /* |
| 918 | * TS_POLLING-cleared state must be visible before we test |
| 919 | * NEED_RESCHED: |
| 920 | */ |
| 921 | smp_mb(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 922 | |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 923 | if (unlikely(need_resched())) { |
| 924 | current_thread_info()->status |= TS_POLLING; |
| 925 | local_irq_enable(); |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 926 | return -EINVAL; |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 927 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 928 | } |
| 929 | |
Venki Pallipadi | 996520c | 2008-03-24 14:24:10 -0700 | [diff] [blame] | 930 | acpi_unlazy_tlb(smp_processor_id()); |
| 931 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 932 | /* Tell the scheduler that we are going deep-idle: */ |
| 933 | sched_clock_idle_sleep_event(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 934 | /* |
| 935 | * Must be done before busmaster disable as we might need to |
| 936 | * access HPET ! |
| 937 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 938 | lapic_timer_state_broadcast(pr, cx, 1); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 939 | |
Len Brown | f461dde | 2009-04-23 18:59:43 -0400 | [diff] [blame] | 940 | kt1 = ktime_get_real(); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 941 | /* |
| 942 | * disable bus master |
| 943 | * bm_check implies we need ARB_DIS |
| 944 | * !bm_check implies we need cache flush |
| 945 | * bm_control implies whether we can do ARB_DIS |
| 946 | * |
| 947 | * That leaves a case where bm_check is set and bm_control is |
| 948 | * not set. In that case we cannot do much, we enter C3 |
| 949 | * without doing anything. |
| 950 | */ |
| 951 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 952 | spin_lock(&c3_lock); |
| 953 | c3_cpu_count++; |
| 954 | /* Disable bus master arbitration when all CPUs are in C3 */ |
| 955 | if (c3_cpu_count == num_online_cpus()) |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 956 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 957 | spin_unlock(&c3_lock); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 958 | } else if (!pr->flags.bm_check) { |
| 959 | ACPI_FLUSH_CPU_CACHE(); |
| 960 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 961 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 962 | acpi_idle_do_entry(cx); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 963 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 964 | /* Re-enable bus master arbitration */ |
| 965 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 966 | spin_lock(&c3_lock); |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 967 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 968 | c3_cpu_count--; |
| 969 | spin_unlock(&c3_lock); |
| 970 | } |
Len Brown | f461dde | 2009-04-23 18:59:43 -0400 | [diff] [blame] | 971 | kt2 = ktime_get_real(); |
Zhao Yakui | 157317b | 2010-06-02 11:04:09 +0800 | [diff] [blame] | 972 | idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1)); |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 973 | idle_time = idle_time_ns; |
| 974 | do_div(idle_time, NSEC_PER_USEC); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 975 | |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 976 | /* Update device last_residency*/ |
| 977 | dev->last_residency = (int)idle_time; |
| 978 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 979 | /* Tell the scheduler how much we idled: */ |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 980 | sched_clock_idle_wakeup_event(idle_time_ns); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 981 | |
| 982 | local_irq_enable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 983 | if (cx->entry_method != ACPI_CSTATE_FFH) |
| 984 | current_thread_info()->status |= TS_POLLING; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 985 | |
| 986 | cx->usage++; |
| 987 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 988 | lapic_timer_state_broadcast(pr, cx, 0); |
Venkatesh Pallipadi | bceefad | 2010-06-02 10:01:09 -0700 | [diff] [blame] | 989 | cx->time += idle_time; |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 990 | return index; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 991 | } |
| 992 | |
| 993 | struct cpuidle_driver acpi_idle_driver = { |
| 994 | .name = "acpi_idle", |
| 995 | .owner = THIS_MODULE, |
| 996 | }; |
| 997 | |
| 998 | /** |
| 999 | * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE |
| 1000 | * @pr: the ACPI processor |
| 1001 | */ |
| 1002 | static int acpi_processor_setup_cpuidle(struct acpi_processor *pr) |
| 1003 | { |
venkatesh.pallipadi@intel.com | 9a0b841 | 2008-01-31 17:35:06 -0800 | [diff] [blame] | 1004 | int i, count = CPUIDLE_DRIVER_STATE_START; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1005 | struct acpi_processor_cx *cx; |
| 1006 | struct cpuidle_state *state; |
| 1007 | struct cpuidle_device *dev = &pr->power.dev; |
| 1008 | |
| 1009 | if (!pr->flags.power_setup_done) |
| 1010 | return -EINVAL; |
| 1011 | |
| 1012 | if (pr->flags.power == 0) { |
| 1013 | return -EINVAL; |
| 1014 | } |
| 1015 | |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1016 | dev->cpu = pr->id; |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 1017 | dev->safe_state_index = -1; |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 1018 | for (i = 0; i < CPUIDLE_STATE_MAX; i++) { |
| 1019 | dev->states[i].name[0] = '\0'; |
| 1020 | dev->states[i].desc[0] = '\0'; |
| 1021 | } |
| 1022 | |
Len Brown | 615dfd9 | 2009-04-23 23:21:29 -0400 | [diff] [blame] | 1023 | if (max_cstate == 0) |
| 1024 | max_cstate = 1; |
| 1025 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1026 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
| 1027 | cx = &pr->power.states[i]; |
| 1028 | state = &dev->states[count]; |
| 1029 | |
| 1030 | if (!cx->valid) |
| 1031 | continue; |
| 1032 | |
| 1033 | #ifdef CONFIG_HOTPLUG_CPU |
| 1034 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
| 1035 | !pr->flags.has_cst && |
| 1036 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
| 1037 | continue; |
| 1038 | #endif |
| 1039 | cpuidle_set_statedata(state, cx); |
| 1040 | |
| 1041 | snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 1042 | strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1043 | state->exit_latency = cx->latency; |
Len Brown | 4963f62 | 2007-12-13 23:50:45 -0500 | [diff] [blame] | 1044 | state->target_residency = cx->latency * latency_factor; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1045 | |
| 1046 | state->flags = 0; |
| 1047 | switch (cx->type) { |
| 1048 | case ACPI_STATE_C1: |
Venki Pallipadi | 8e92b66 | 2008-02-29 10:24:32 -0800 | [diff] [blame] | 1049 | if (cx->entry_method == ACPI_CSTATE_FFH) |
| 1050 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1051 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1052 | state->enter = acpi_idle_enter_c1; |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 1053 | dev->safe_state_index = count; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1054 | break; |
| 1055 | |
| 1056 | case ACPI_STATE_C2: |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1057 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1058 | state->enter = acpi_idle_enter_simple; |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame^] | 1059 | dev->safe_state_index = count; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1060 | break; |
| 1061 | |
| 1062 | case ACPI_STATE_C3: |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1063 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1064 | state->enter = pr->flags.bm_check ? |
| 1065 | acpi_idle_enter_bm : |
| 1066 | acpi_idle_enter_simple; |
| 1067 | break; |
| 1068 | } |
| 1069 | |
| 1070 | count++; |
venkatesh.pallipadi@intel.com | 9a0b841 | 2008-01-31 17:35:06 -0800 | [diff] [blame] | 1071 | if (count == CPUIDLE_STATE_MAX) |
| 1072 | break; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1073 | } |
| 1074 | |
| 1075 | dev->state_count = count; |
| 1076 | |
| 1077 | if (!count) |
| 1078 | return -EINVAL; |
| 1079 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1080 | return 0; |
| 1081 | } |
| 1082 | |
| 1083 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
| 1084 | { |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1085 | int ret = 0; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1086 | |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 1087 | if (disabled_by_idle_boot_param()) |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1088 | return 0; |
| 1089 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1090 | if (!pr) |
| 1091 | return -EINVAL; |
| 1092 | |
| 1093 | if (nocst) { |
| 1094 | return -ENODEV; |
| 1095 | } |
| 1096 | |
| 1097 | if (!pr->flags.power_setup_done) |
| 1098 | return -ENODEV; |
| 1099 | |
| 1100 | cpuidle_pause_and_lock(); |
| 1101 | cpuidle_disable_device(&pr->power.dev); |
| 1102 | acpi_processor_get_power_info(pr); |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1103 | if (pr->flags.power) { |
| 1104 | acpi_processor_setup_cpuidle(pr); |
| 1105 | ret = cpuidle_enable_device(&pr->power.dev); |
| 1106 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1107 | cpuidle_resume_and_unlock(); |
| 1108 | |
| 1109 | return ret; |
| 1110 | } |
| 1111 | |
Pierre Ossman | 7af8b66 | 2006-10-10 14:20:31 -0700 | [diff] [blame] | 1112 | int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1113 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1115 | acpi_status status = 0; |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 1116 | static int first_run; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 1118 | if (disabled_by_idle_boot_param()) |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1119 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | |
| 1121 | if (!first_run) { |
| 1122 | dmi_check_system(processor_power_dmi_table); |
Alexey Starikovskiy | c1c3063 | 2007-11-26 20:42:19 +0100 | [diff] [blame] | 1123 | max_cstate = acpi_processor_cstate_check(max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | if (max_cstate < ACPI_C_STATES_MAX) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1125 | printk(KERN_NOTICE |
| 1126 | "ACPI: processor limited to max C-state %d\n", |
| 1127 | max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | first_run++; |
| 1129 | } |
| 1130 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1131 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1132 | return -EINVAL; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1133 | |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1134 | if (acpi_gbl_FADT.cst_control && !nocst) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1135 | status = |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1136 | 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] | 1137 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1138 | ACPI_EXCEPTION((AE_INFO, status, |
| 1139 | "Notifying BIOS of _CST ability failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | } |
| 1141 | } |
| 1142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | acpi_processor_get_power_info(pr); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1144 | pr->flags.power_setup_done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | |
| 1146 | /* |
| 1147 | * Install the idle handler if processor power management is supported. |
| 1148 | * Note that we use previously set idle handler will be used on |
| 1149 | * platforms that only support C1. |
| 1150 | */ |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1151 | if (pr->flags.power) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1152 | acpi_processor_setup_cpuidle(pr); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1153 | if (cpuidle_register_device(&pr->power.dev)) |
| 1154 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | } |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1156 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | } |
| 1158 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1159 | int acpi_processor_power_exit(struct acpi_processor *pr, |
| 1160 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | { |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 1162 | if (disabled_by_idle_boot_param()) |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1163 | return 0; |
| 1164 | |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1165 | cpuidle_unregister_device(&pr->power.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | pr->flags.power_setup_done = 0; |
| 1167 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1168 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | } |