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() */ |
Jean Pihet | e8db0be | 2011-08-25 15:35:03 +0200 | [diff] [blame] | 40 | #include <linux/pm_qos.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 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 68 | static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; |
| 69 | module_param(max_cstate, uint, 0000); |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 70 | static unsigned int nocst __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | module_param(nocst, uint, 0000); |
Len Brown | d3e7e99 | 2010-07-22 17:23:10 -0400 | [diff] [blame] | 72 | static int bm_check_disable __read_mostly; |
| 73 | module_param(bm_check_disable, uint, 0000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Len Brown | 25de571 | 2007-12-14 00:24:15 -0500 | [diff] [blame] | 75 | static unsigned int latency_factor __read_mostly = 2; |
Len Brown | 4963f62 | 2007-12-13 23:50:45 -0500 | [diff] [blame] | 76 | module_param(latency_factor, uint, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 78 | static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device); |
| 79 | |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 80 | static int disabled_by_idle_boot_param(void) |
| 81 | { |
| 82 | return boot_option_idle_override == IDLE_POLL || |
| 83 | boot_option_idle_override == IDLE_FORCE_MWAIT || |
| 84 | boot_option_idle_override == IDLE_HALT; |
| 85 | } |
| 86 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | /* |
| 88 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. |
| 89 | * For now disable this. Probably a bug somewhere else. |
| 90 | * |
| 91 | * To skip this limit, boot/load with a large max_cstate limit. |
| 92 | */ |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 93 | static int set_max_cstate(const struct dmi_system_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
| 95 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) |
| 96 | return 0; |
| 97 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 98 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 99 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
| 100 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 102 | max_cstate = (long)id->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
Ashok Raj | 7ded568 | 2006-02-03 21:51:23 +0100 | [diff] [blame] | 107 | /* Actually this shouldn't be __cpuinitdata, would be better to fix the |
| 108 | callers to only run once -AK */ |
| 109 | static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 110 | { set_max_cstate, "Clevo 5600D", { |
| 111 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 112 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 113 | (void *)2}, |
Arjan van de Ven | 370d5cd | 2010-01-27 15:25:39 -0800 | [diff] [blame] | 114 | { set_max_cstate, "Pavilion zv5000", { |
| 115 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
| 116 | DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")}, |
| 117 | (void *)1}, |
| 118 | { set_max_cstate, "Asus L8400B", { |
| 119 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), |
| 120 | DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")}, |
| 121 | (void *)1}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | {}, |
| 123 | }; |
| 124 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 125 | |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 126 | /* |
| 127 | * Callers should disable interrupts before the call and enable |
| 128 | * interrupts after return. |
| 129 | */ |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 130 | static void acpi_safe_halt(void) |
| 131 | { |
| 132 | current_thread_info()->status &= ~TS_POLLING; |
| 133 | /* |
| 134 | * TS_POLLING-cleared state must be visible before we |
| 135 | * test NEED_RESCHED: |
| 136 | */ |
| 137 | smp_mb(); |
Venki Pallipadi | 71e93d1 | 2008-03-13 17:18:19 -0700 | [diff] [blame] | 138 | if (!need_resched()) { |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 139 | safe_halt(); |
Venki Pallipadi | 71e93d1 | 2008-03-13 17:18:19 -0700 | [diff] [blame] | 140 | local_irq_disable(); |
| 141 | } |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 142 | current_thread_info()->status |= TS_POLLING; |
| 143 | } |
| 144 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 145 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
| 146 | |
| 147 | /* |
| 148 | * Some BIOS implementations switch to C3 in the published C2 state. |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 149 | * This seems to be a common problem on AMD boxen, but other vendors |
| 150 | * are affected too. We pick the most conservative approach: we assume |
| 151 | * that the local APIC stops in both C2 and C3. |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 152 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 153 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 154 | struct acpi_processor_cx *cx) |
| 155 | { |
| 156 | struct acpi_processor_power *pwr = &pr->power; |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 157 | 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] | 158 | |
Venkatesh Pallipadi | db954b5 | 2009-04-06 18:51:29 -0700 | [diff] [blame] | 159 | if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT)) |
| 160 | return; |
| 161 | |
Len Brown | 02c68a0 | 2011-04-01 16:59:53 -0400 | [diff] [blame] | 162 | if (amd_e400_c1e_detected) |
Shaohua Li | 87ad57ba | 2009-05-19 16:09:42 +0800 | [diff] [blame] | 163 | type = ACPI_STATE_C1; |
| 164 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 165 | /* |
| 166 | * Check, if one of the previous states already marked the lapic |
| 167 | * unstable |
| 168 | */ |
| 169 | if (pwr->timer_broadcast_on_state < state) |
| 170 | return; |
| 171 | |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 172 | if (cx->type >= type) |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 173 | pr->power.timer_broadcast_on_state = state; |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 174 | } |
| 175 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 176 | static void __lapic_timer_propagate_broadcast(void *arg) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 177 | { |
Suresh Siddha | f833bab | 2009-08-17 14:34:59 -0700 | [diff] [blame] | 178 | struct acpi_processor *pr = (struct acpi_processor *) arg; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 179 | unsigned long reason; |
| 180 | |
| 181 | reason = pr->power.timer_broadcast_on_state < INT_MAX ? |
| 182 | CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; |
| 183 | |
| 184 | clockevents_notify(reason, &pr->id); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 185 | } |
| 186 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 187 | static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) |
| 188 | { |
| 189 | smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast, |
| 190 | (void *)pr, 1); |
| 191 | } |
| 192 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 193 | /* Power(C) State timer broadcast control */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 194 | static void lapic_timer_state_broadcast(struct acpi_processor *pr, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 195 | struct acpi_processor_cx *cx, |
| 196 | int broadcast) |
| 197 | { |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 198 | int state = cx - pr->power.states; |
| 199 | |
| 200 | if (state >= pr->power.timer_broadcast_on_state) { |
| 201 | unsigned long reason; |
| 202 | |
| 203 | reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : |
| 204 | CLOCK_EVT_NOTIFY_BROADCAST_EXIT; |
| 205 | clockevents_notify(reason, &pr->id); |
| 206 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | #else |
| 210 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 211 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 212 | struct acpi_processor_cx *cstate) { } |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 213 | static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { } |
| 214 | static void lapic_timer_state_broadcast(struct acpi_processor *pr, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 215 | struct acpi_processor_cx *cx, |
| 216 | int broadcast) |
| 217 | { |
| 218 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 219 | |
| 220 | #endif |
| 221 | |
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 | |
Rafael J. Wysocki | e8110b6 | 2012-06-27 23:26:26 +0200 | [diff] [blame] | 238 | int acpi_processor_suspend(struct device *dev) |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 239 | { |
Len Brown | 815ab0f | 2009-05-07 22:19:45 -0400 | [diff] [blame] | 240 | acpi_idle_bm_rld_save(); |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 241 | return 0; |
| 242 | } |
| 243 | |
Rafael J. Wysocki | e8110b6 | 2012-06-27 23:26:26 +0200 | [diff] [blame] | 244 | int acpi_processor_resume(struct device *dev) |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 245 | { |
Len Brown | 815ab0f | 2009-05-07 22:19:45 -0400 | [diff] [blame] | 246 | acpi_idle_bm_rld_restore(); |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 247 | return 0; |
| 248 | } |
| 249 | |
John Stultz | 592913e | 2010-07-13 17:56:20 -0700 | [diff] [blame] | 250 | #if defined(CONFIG_X86) |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 251 | static void tsc_check_state(int state) |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 252 | { |
| 253 | switch (boot_cpu_data.x86_vendor) { |
| 254 | case X86_VENDOR_AMD: |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 255 | case X86_VENDOR_INTEL: |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 256 | /* |
| 257 | * AMD Fam10h TSC will tick in all |
| 258 | * C/P/S0/S1 states when this bit is set. |
| 259 | */ |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 260 | if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 261 | return; |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 262 | |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 263 | /*FALL THROUGH*/ |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 264 | default: |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 265 | /* TSC could halt in idle, so notify users */ |
| 266 | if (state > ACPI_STATE_C1) |
| 267 | mark_tsc_unstable("TSC halts in idle"); |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 268 | } |
| 269 | } |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 270 | #else |
| 271 | static void tsc_check_state(int state) { return; } |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 272 | #endif |
| 273 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 274 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
| 277 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 278 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
| 280 | if (!pr->pblk) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 281 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | /* if info is obtained from pblk/fadt, type equals state */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
| 285 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; |
| 286 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 287 | #ifndef CONFIG_HOTPLUG_CPU |
| 288 | /* |
| 289 | * Check for P_LVL2_UP flag before entering C2 and above on |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 290 | * an SMP system. |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 291 | */ |
Alexey Starikovskiy | ad71860a | 2007-02-02 19:48:19 +0300 | [diff] [blame] | 292 | if ((num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 293 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 294 | return -ENODEV; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 295 | #endif |
| 296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | /* determine C2 and C3 address from pblk */ |
| 298 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; |
| 299 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; |
| 300 | |
| 301 | /* determine latencies from FADT */ |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 302 | pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.c2_latency; |
| 303 | pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.c3_latency; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
Len Brown | 5d76b6f | 2010-01-19 22:41:14 -0500 | [diff] [blame] | 305 | /* |
| 306 | * FADT specified C2 latency must be less than or equal to |
| 307 | * 100 microseconds. |
| 308 | */ |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 309 | if (acpi_gbl_FADT.c2_latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { |
Len Brown | 5d76b6f | 2010-01-19 22:41:14 -0500 | [diff] [blame] | 310 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 311 | "C2 latency too large [%d]\n", acpi_gbl_FADT.c2_latency)); |
Len Brown | 5d76b6f | 2010-01-19 22:41:14 -0500 | [diff] [blame] | 312 | /* invalidate C2 */ |
| 313 | pr->power.states[ACPI_STATE_C2].address = 0; |
| 314 | } |
| 315 | |
Len Brown | a6d72c1 | 2010-01-19 23:10:04 -0500 | [diff] [blame] | 316 | /* |
| 317 | * FADT supplied C3 latency must be less than or equal to |
| 318 | * 1000 microseconds. |
| 319 | */ |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 320 | if (acpi_gbl_FADT.c3_latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { |
Len Brown | a6d72c1 | 2010-01-19 23:10:04 -0500 | [diff] [blame] | 321 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 322 | "C3 latency too large [%d]\n", acpi_gbl_FADT.c3_latency)); |
Len Brown | a6d72c1 | 2010-01-19 23:10:04 -0500 | [diff] [blame] | 323 | /* invalidate C3 */ |
| 324 | pr->power.states[ACPI_STATE_C3].address = 0; |
| 325 | } |
| 326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 328 | "lvl2[0x%08x] lvl3[0x%08x]\n", |
| 329 | pr->power.states[ACPI_STATE_C2].address, |
| 330 | pr->power.states[ACPI_STATE_C3].address)); |
| 331 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 332 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
| 334 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 335 | static int acpi_processor_get_power_info_default(struct acpi_processor *pr) |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 336 | { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 337 | if (!pr->power.states[ACPI_STATE_C1].valid) { |
| 338 | /* set the first C-State to C1 */ |
| 339 | /* all processors need to support C1 */ |
| 340 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; |
| 341 | pr->power.states[ACPI_STATE_C1].valid = 1; |
Venkatesh Pallipadi | 0fda6b4 | 2008-04-09 21:31:46 -0400 | [diff] [blame] | 342 | pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 343 | } |
| 344 | /* the C0 state only exists as a filler in our array */ |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 345 | pr->power.states[ACPI_STATE_C0].valid = 1; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 346 | return 0; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 347 | } |
| 348 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 349 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 351 | acpi_status status = 0; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 352 | u64 count; |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 353 | int current_count; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 354 | int i; |
| 355 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 356 | union acpi_object *cst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | if (nocst) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 360 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 362 | current_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | |
| 364 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); |
| 365 | if (ACPI_FAILURE(status)) { |
| 366 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 367 | return -ENODEV; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 368 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 370 | cst = buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
| 372 | /* There must be at least 2 elements */ |
| 373 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 374 | printk(KERN_ERR PREFIX "not enough elements in _CST\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | status = -EFAULT; |
| 376 | goto end; |
| 377 | } |
| 378 | |
| 379 | count = cst->package.elements[0].integer.value; |
| 380 | |
| 381 | /* Validate number of power states. */ |
| 382 | if (count < 1 || count != cst->package.count - 1) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 383 | printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | status = -EFAULT; |
| 385 | goto end; |
| 386 | } |
| 387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | /* Tell driver that at least _CST is supported. */ |
| 389 | pr->flags.has_cst = 1; |
| 390 | |
| 391 | for (i = 1; i <= count; i++) { |
| 392 | union acpi_object *element; |
| 393 | union acpi_object *obj; |
| 394 | struct acpi_power_register *reg; |
| 395 | struct acpi_processor_cx cx; |
| 396 | |
| 397 | memset(&cx, 0, sizeof(cx)); |
| 398 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 399 | element = &(cst->package.elements[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | if (element->type != ACPI_TYPE_PACKAGE) |
| 401 | continue; |
| 402 | |
| 403 | if (element->package.count != 4) |
| 404 | continue; |
| 405 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 406 | obj = &(element->package.elements[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
| 408 | if (obj->type != ACPI_TYPE_BUFFER) |
| 409 | continue; |
| 410 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 411 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
| 413 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 414 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | continue; |
| 416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | /* There should be an easy way to extract an integer... */ |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 418 | obj = &(element->package.elements[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | if (obj->type != ACPI_TYPE_INTEGER) |
| 420 | continue; |
| 421 | |
| 422 | cx.type = obj->integer.value; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 423 | /* |
| 424 | * Some buggy BIOSes won't list C1 in _CST - |
| 425 | * Let acpi_processor_get_power_info_default() handle them later |
| 426 | */ |
| 427 | if (i == 1 && cx.type != ACPI_STATE_C1) |
| 428 | current_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 430 | cx.address = reg->address; |
| 431 | cx.index = current_count + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 433 | cx.entry_method = ACPI_CSTATE_SYSTEMIO; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 434 | if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { |
| 435 | if (acpi_processor_ffh_cstate_probe |
| 436 | (pr->id, &cx, reg) == 0) { |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 437 | cx.entry_method = ACPI_CSTATE_FFH; |
| 438 | } else if (cx.type == ACPI_STATE_C1) { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 439 | /* |
| 440 | * C1 is a special case where FIXED_HARDWARE |
| 441 | * can be handled in non-MWAIT way as well. |
| 442 | * In that case, save this _CST entry info. |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 443 | * Otherwise, ignore this info and continue. |
| 444 | */ |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 445 | cx.entry_method = ACPI_CSTATE_HALT; |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 446 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 447 | } else { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 448 | continue; |
| 449 | } |
Zhao Yakui | da5e09a | 2008-06-24 18:01:09 +0800 | [diff] [blame] | 450 | if (cx.type == ACPI_STATE_C1 && |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 451 | (boot_option_idle_override == IDLE_NOMWAIT)) { |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 452 | /* |
| 453 | * In most cases the C1 space_id obtained from |
| 454 | * _CST object is FIXED_HARDWARE access mode. |
| 455 | * But when the option of idle=halt is added, |
| 456 | * the entry_method type should be changed from |
| 457 | * CSTATE_FFH to CSTATE_HALT. |
Zhao Yakui | da5e09a | 2008-06-24 18:01:09 +0800 | [diff] [blame] | 458 | * When the option of idle=nomwait is added, |
| 459 | * the C1 entry_method type should be |
| 460 | * CSTATE_HALT. |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 461 | */ |
| 462 | cx.entry_method = ACPI_CSTATE_HALT; |
| 463 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
| 464 | } |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 465 | } else { |
| 466 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", |
| 467 | cx.address); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 468 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
Venkatesh Pallipadi | 0fda6b4 | 2008-04-09 21:31:46 -0400 | [diff] [blame] | 470 | if (cx.type == ACPI_STATE_C1) { |
| 471 | cx.valid = 1; |
| 472 | } |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 473 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 474 | obj = &(element->package.elements[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | if (obj->type != ACPI_TYPE_INTEGER) |
| 476 | continue; |
| 477 | |
| 478 | cx.latency = obj->integer.value; |
| 479 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 480 | obj = &(element->package.elements[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | if (obj->type != ACPI_TYPE_INTEGER) |
| 482 | continue; |
| 483 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 484 | current_count++; |
| 485 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); |
| 486 | |
| 487 | /* |
| 488 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 |
| 489 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) |
| 490 | */ |
| 491 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { |
| 492 | printk(KERN_WARNING |
| 493 | "Limiting number of power states to max (%d)\n", |
| 494 | ACPI_PROCESSOR_MAX_POWER); |
| 495 | printk(KERN_WARNING |
| 496 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); |
| 497 | break; |
| 498 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
| 500 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 501 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 502 | current_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
| 504 | /* Validate number of power states discovered */ |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 505 | if (current_count < 2) |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 506 | status = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 508 | end: |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 509 | kfree(buffer.pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 511 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | } |
| 513 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 514 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
| 515 | struct acpi_processor_cx *cx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | { |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 517 | static int bm_check_flag = -1; |
| 518 | static int bm_control_flag = -1; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
| 521 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 522 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
| 524 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) |
| 526 | * DMA transfers are used by any ISA device to avoid livelock. |
| 527 | * Note that we could disable Type-F DMA (as recommended by |
| 528 | * the erratum), but this is known to disrupt certain ISA |
| 529 | * devices thus we take the conservative approach. |
| 530 | */ |
| 531 | else if (errata.piix4.fdma) { |
| 532 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 533 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 534 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } |
| 536 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 537 | /* 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] | 538 | if (bm_check_flag == -1) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 539 | /* Determine whether bm_check is needed based on CPU */ |
| 540 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); |
| 541 | bm_check_flag = pr->flags.bm_check; |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 542 | bm_control_flag = pr->flags.bm_control; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 543 | } else { |
| 544 | pr->flags.bm_check = bm_check_flag; |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 545 | pr->flags.bm_control = bm_control_flag; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | if (pr->flags.bm_check) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 549 | if (!pr->flags.bm_control) { |
Venki Pallipadi | ed3110e | 2007-07-31 12:04:31 -0700 | [diff] [blame] | 550 | if (pr->flags.has_cst != 1) { |
| 551 | /* bus mastering control is necessary */ |
| 552 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 553 | "C3 support requires BM control\n")); |
| 554 | return; |
| 555 | } else { |
| 556 | /* Here we enter C3 without bus mastering */ |
| 557 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 558 | "C3 support without BM control\n")); |
| 559 | } |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 560 | } |
| 561 | } else { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 562 | /* |
| 563 | * WBINVD should be set in fadt, for C3 state to be |
| 564 | * supported on when bm_check is not required. |
| 565 | */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 566 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 567 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 568 | "Cache invalidation should work properly" |
| 569 | " for C3 to be enabled on SMP systems\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 570 | return; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 571 | } |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 572 | } |
| 573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | /* |
| 575 | * Otherwise we've met all of our C3 requirements. |
| 576 | * Normalize the C3 latency to expidite policy. Enable |
| 577 | * checking of bus mastering status (bm_check) so we can |
| 578 | * use this in our C3 policy |
| 579 | */ |
| 580 | cx->valid = 1; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 581 | |
Len Brown | 31878dd | 2009-01-28 18:28:09 -0500 | [diff] [blame] | 582 | /* |
| 583 | * On older chipsets, BM_RLD needs to be set |
| 584 | * in order for Bus Master activity to wake the |
| 585 | * system from C3. Newer chipsets handle DMA |
| 586 | * during C3 automatically and BM_RLD is a NOP. |
| 587 | * In either case, the proper way to |
| 588 | * handle BM_RLD is to set it and leave it set. |
| 589 | */ |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 590 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 592 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } |
| 594 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
| 596 | { |
| 597 | unsigned int i; |
| 598 | unsigned int working = 0; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 599 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 600 | pr->power.timer_broadcast_on_state = INT_MAX; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 601 | |
Len Brown | a0bf284 | 2009-05-15 01:29:31 -0400 | [diff] [blame] | 602 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
| 604 | |
| 605 | switch (cx->type) { |
| 606 | case ACPI_STATE_C1: |
| 607 | cx->valid = 1; |
| 608 | break; |
| 609 | |
| 610 | case ACPI_STATE_C2: |
Len Brown | d22edd2 | 2010-01-19 23:29:09 -0500 | [diff] [blame] | 611 | if (!cx->address) |
| 612 | break; |
| 613 | cx->valid = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | break; |
| 615 | |
| 616 | case ACPI_STATE_C3: |
| 617 | acpi_processor_power_verify_c3(pr, cx); |
| 618 | break; |
| 619 | } |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 620 | if (!cx->valid) |
| 621 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 623 | lapic_timer_check_state(i, pr, cx); |
| 624 | tsc_check_state(cx->type); |
| 625 | working++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
| 627 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 628 | lapic_timer_propagate_broadcast(pr); |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 629 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | return (working); |
| 631 | } |
| 632 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 633 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | { |
| 635 | unsigned int i; |
| 636 | int result; |
| 637 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | |
| 639 | /* NOTE: the idle thread may not be running while calling |
| 640 | * this function */ |
| 641 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 642 | /* Zero initialize all the C-states info. */ |
| 643 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
| 644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | result = acpi_processor_get_power_info_cst(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 646 | if (result == -ENODEV) |
Darrick J. Wong | c5a114f | 2006-10-19 23:28:28 -0700 | [diff] [blame] | 647 | result = acpi_processor_get_power_info_fadt(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 648 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 649 | if (result) |
| 650 | return result; |
| 651 | |
| 652 | acpi_processor_get_power_info_default(pr); |
| 653 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 654 | pr->power.count = acpi_processor_power_verify(pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | /* |
| 657 | * if one state of type C2 or C3 is available, mark this |
| 658 | * CPU as being "idle manageable" |
| 659 | */ |
| 660 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 661 | if (pr->power.states[i].valid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | pr->power.count = i; |
Linus Torvalds | 2203d6e | 2005-11-18 07:29:51 -0800 | [diff] [blame] | 663 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
| 664 | pr->flags.power = 1; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 665 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | } |
| 667 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 668 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | } |
| 670 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 671 | /** |
| 672 | * acpi_idle_bm_check - checks if bus master activity was detected |
| 673 | */ |
| 674 | static int acpi_idle_bm_check(void) |
| 675 | { |
| 676 | u32 bm_status = 0; |
| 677 | |
Len Brown | d3e7e99 | 2010-07-22 17:23:10 -0400 | [diff] [blame] | 678 | if (bm_check_disable) |
| 679 | return 0; |
| 680 | |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 681 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 682 | if (bm_status) |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 683 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 684 | /* |
| 685 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect |
| 686 | * the true state of bus mastering activity; forcing us to |
| 687 | * manually check the BMIDEA bit of each IDE channel. |
| 688 | */ |
| 689 | else if (errata.piix4.bmisx) { |
| 690 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) |
| 691 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
| 692 | bm_status = 1; |
| 693 | } |
| 694 | return bm_status; |
| 695 | } |
| 696 | |
| 697 | /** |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 698 | * acpi_idle_do_entry - a helper function that does C2 and C3 type entry |
| 699 | * @cx: cstate data |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 700 | * |
| 701 | * Caller disables interrupt before call and enables interrupt after return. |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 702 | */ |
| 703 | static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) |
| 704 | { |
Steven Rostedt | dcf3099 | 2008-07-25 18:00:42 -0400 | [diff] [blame] | 705 | /* Don't trace irqs off for idle */ |
| 706 | stop_critical_timings(); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 707 | if (cx->entry_method == ACPI_CSTATE_FFH) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 708 | /* Call into architectural FFH based C-state */ |
| 709 | acpi_processor_ffh_cstate_enter(cx); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 710 | } else if (cx->entry_method == ACPI_CSTATE_HALT) { |
| 711 | acpi_safe_halt(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 712 | } else { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 713 | /* IO port based C-state */ |
| 714 | inb(cx->address); |
| 715 | /* Dummy wait op - must do something useless after P_LVL2 read |
| 716 | because chipsets cannot guarantee that STPCLK# signal |
| 717 | gets asserted in time to freeze execution properly. */ |
Andi Kleen | cfa806f | 2010-07-20 15:18:36 -0700 | [diff] [blame] | 718 | inl(acpi_gbl_FADT.xpm_timer_block.address); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 719 | } |
Steven Rostedt | dcf3099 | 2008-07-25 18:00:42 -0400 | [diff] [blame] | 720 | start_critical_timings(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 721 | } |
| 722 | |
| 723 | /** |
| 724 | * acpi_idle_enter_c1 - enters an ACPI C1 state-type |
| 725 | * @dev: the target CPU |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 726 | * @drv: cpuidle driver containing cpuidle state info |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 727 | * @index: index of target state |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 728 | * |
| 729 | * This is equivalent to the HALT instruction. |
| 730 | */ |
| 731 | static int acpi_idle_enter_c1(struct cpuidle_device *dev, |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 732 | struct cpuidle_driver *drv, int index) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 733 | { |
| 734 | struct acpi_processor *pr; |
Deepthi Dharwar | 4202735 | 2011-10-28 16:20:33 +0530 | [diff] [blame] | 735 | struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; |
| 736 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); |
venkatesh.pallipadi@intel.com | 9b12e18 | 2008-01-31 17:35:05 -0800 | [diff] [blame] | 737 | |
Christoph Lameter | 4a6f4fe | 2010-12-06 11:16:24 -0600 | [diff] [blame] | 738 | pr = __this_cpu_read(processors); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 739 | |
| 740 | if (unlikely(!pr)) |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 741 | return -EINVAL; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 742 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 743 | lapic_timer_state_broadcast(pr, cx, 1); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 744 | acpi_idle_do_entry(cx); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 745 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 746 | lapic_timer_state_broadcast(pr, cx, 0); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 747 | |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 748 | return index; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 749 | } |
| 750 | |
Boris Ostrovsky | 1a022e3 | 2012-03-13 19:55:09 +0100 | [diff] [blame] | 751 | |
| 752 | /** |
| 753 | * acpi_idle_play_dead - enters an ACPI state for long-term idle (i.e. off-lining) |
| 754 | * @dev: the target CPU |
| 755 | * @index: the index of suggested state |
| 756 | */ |
| 757 | static int acpi_idle_play_dead(struct cpuidle_device *dev, int index) |
| 758 | { |
| 759 | struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; |
| 760 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); |
| 761 | |
| 762 | ACPI_FLUSH_CPU_CACHE(); |
| 763 | |
| 764 | while (1) { |
| 765 | |
| 766 | if (cx->entry_method == ACPI_CSTATE_HALT) |
Luck, Tony | 54f7007 | 2012-04-03 09:37:28 -0700 | [diff] [blame] | 767 | safe_halt(); |
Boris Ostrovsky | 1a022e3 | 2012-03-13 19:55:09 +0100 | [diff] [blame] | 768 | else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) { |
| 769 | inb(cx->address); |
| 770 | /* See comment in acpi_idle_do_entry() */ |
| 771 | inl(acpi_gbl_FADT.xpm_timer_block.address); |
| 772 | } else |
| 773 | return -ENODEV; |
| 774 | } |
| 775 | |
| 776 | /* Never reached */ |
| 777 | return 0; |
| 778 | } |
| 779 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 780 | /** |
| 781 | * acpi_idle_enter_simple - enters an ACPI state without BM handling |
| 782 | * @dev: the target CPU |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 783 | * @drv: cpuidle driver with cpuidle state information |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 784 | * @index: the index of suggested state |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 785 | */ |
| 786 | static int acpi_idle_enter_simple(struct cpuidle_device *dev, |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 787 | struct cpuidle_driver *drv, int index) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 788 | { |
| 789 | struct acpi_processor *pr; |
Deepthi Dharwar | 4202735 | 2011-10-28 16:20:33 +0530 | [diff] [blame] | 790 | struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; |
| 791 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 792 | |
Christoph Lameter | 4a6f4fe | 2010-12-06 11:16:24 -0600 | [diff] [blame] | 793 | pr = __this_cpu_read(processors); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 794 | |
| 795 | if (unlikely(!pr)) |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 796 | return -EINVAL; |
Len Brown | e196441 | 2007-10-04 01:23:47 -0400 | [diff] [blame] | 797 | |
Pallipadi, Venkatesh | d306ebc | 2010-02-10 10:35:31 -0800 | [diff] [blame] | 798 | if (cx->entry_method != ACPI_CSTATE_FFH) { |
| 799 | current_thread_info()->status &= ~TS_POLLING; |
| 800 | /* |
| 801 | * TS_POLLING-cleared state must be visible before we test |
| 802 | * NEED_RESCHED: |
| 803 | */ |
| 804 | smp_mb(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 805 | |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 806 | if (unlikely(need_resched())) { |
| 807 | current_thread_info()->status |= TS_POLLING; |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 808 | return -EINVAL; |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 809 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 810 | } |
| 811 | |
Thomas Gleixner | e17bcb4 | 2007-12-07 19:16:17 +0100 | [diff] [blame] | 812 | /* |
| 813 | * Must be done before busmaster disable as we might need to |
| 814 | * access HPET ! |
| 815 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 816 | lapic_timer_state_broadcast(pr, cx, 1); |
Thomas Gleixner | e17bcb4 | 2007-12-07 19:16:17 +0100 | [diff] [blame] | 817 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 818 | if (cx->type == ACPI_STATE_C3) |
| 819 | ACPI_FLUSH_CPU_CACHE(); |
| 820 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 821 | /* Tell the scheduler that we are going deep-idle: */ |
| 822 | sched_clock_idle_sleep_event(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 823 | acpi_idle_do_entry(cx); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 824 | |
Julius Werner | a474a51 | 2012-11-27 14:17:58 +0100 | [diff] [blame] | 825 | sched_clock_idle_wakeup_event(0); |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 826 | |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 827 | if (cx->entry_method != ACPI_CSTATE_FFH) |
| 828 | current_thread_info()->status |= TS_POLLING; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 829 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 830 | lapic_timer_state_broadcast(pr, cx, 0); |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 831 | return index; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 832 | } |
| 833 | |
| 834 | static int c3_cpu_count; |
Thomas Gleixner | e12f65f | 2009-07-25 18:14:37 +0200 | [diff] [blame] | 835 | static DEFINE_RAW_SPINLOCK(c3_lock); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 836 | |
| 837 | /** |
| 838 | * acpi_idle_enter_bm - enters C3 with proper BM handling |
| 839 | * @dev: the target CPU |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 840 | * @drv: cpuidle driver containing state data |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 841 | * @index: the index of suggested state |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 842 | * |
| 843 | * If BM is detected, the deepest non-C3 idle state is entered instead. |
| 844 | */ |
| 845 | static int acpi_idle_enter_bm(struct cpuidle_device *dev, |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 846 | struct cpuidle_driver *drv, int index) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 847 | { |
| 848 | struct acpi_processor *pr; |
Deepthi Dharwar | 4202735 | 2011-10-28 16:20:33 +0530 | [diff] [blame] | 849 | struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; |
| 850 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 851 | |
Christoph Lameter | 4a6f4fe | 2010-12-06 11:16:24 -0600 | [diff] [blame] | 852 | pr = __this_cpu_read(processors); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 853 | |
| 854 | if (unlikely(!pr)) |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 855 | return -EINVAL; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 856 | |
Len Brown | 718be4a | 2010-07-22 16:54:27 -0400 | [diff] [blame] | 857 | if (!cx->bm_sts_skip && acpi_idle_bm_check()) { |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 858 | if (drv->safe_state_index >= 0) { |
| 859 | return drv->states[drv->safe_state_index].enter(dev, |
| 860 | drv, drv->safe_state_index); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 861 | } else { |
Preeti U Murthy | 8651f97 | 2012-07-09 10:12:56 +0200 | [diff] [blame] | 862 | acpi_safe_halt(); |
Deepthi Dharwar | 75cc523 | 2012-06-25 23:59:54 +0200 | [diff] [blame] | 863 | return -EBUSY; |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 864 | } |
| 865 | } |
| 866 | |
Pallipadi, Venkatesh | d306ebc | 2010-02-10 10:35:31 -0800 | [diff] [blame] | 867 | if (cx->entry_method != ACPI_CSTATE_FFH) { |
| 868 | current_thread_info()->status &= ~TS_POLLING; |
| 869 | /* |
| 870 | * TS_POLLING-cleared state must be visible before we test |
| 871 | * NEED_RESCHED: |
| 872 | */ |
| 873 | smp_mb(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 874 | |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 875 | if (unlikely(need_resched())) { |
| 876 | current_thread_info()->status |= TS_POLLING; |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 877 | return -EINVAL; |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 878 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 879 | } |
| 880 | |
Venki Pallipadi | 996520c | 2008-03-24 14:24:10 -0700 | [diff] [blame] | 881 | acpi_unlazy_tlb(smp_processor_id()); |
| 882 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 883 | /* Tell the scheduler that we are going deep-idle: */ |
| 884 | sched_clock_idle_sleep_event(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 885 | /* |
| 886 | * Must be done before busmaster disable as we might need to |
| 887 | * access HPET ! |
| 888 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 889 | lapic_timer_state_broadcast(pr, cx, 1); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 890 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 891 | /* |
| 892 | * disable bus master |
| 893 | * bm_check implies we need ARB_DIS |
| 894 | * !bm_check implies we need cache flush |
| 895 | * bm_control implies whether we can do ARB_DIS |
| 896 | * |
| 897 | * That leaves a case where bm_check is set and bm_control is |
| 898 | * not set. In that case we cannot do much, we enter C3 |
| 899 | * without doing anything. |
| 900 | */ |
| 901 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Thomas Gleixner | e12f65f | 2009-07-25 18:14:37 +0200 | [diff] [blame] | 902 | raw_spin_lock(&c3_lock); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 903 | c3_cpu_count++; |
| 904 | /* Disable bus master arbitration when all CPUs are in C3 */ |
| 905 | if (c3_cpu_count == num_online_cpus()) |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 906 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1); |
Thomas Gleixner | e12f65f | 2009-07-25 18:14:37 +0200 | [diff] [blame] | 907 | raw_spin_unlock(&c3_lock); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 908 | } else if (!pr->flags.bm_check) { |
| 909 | ACPI_FLUSH_CPU_CACHE(); |
| 910 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 911 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 912 | acpi_idle_do_entry(cx); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 913 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 914 | /* Re-enable bus master arbitration */ |
| 915 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Thomas Gleixner | e12f65f | 2009-07-25 18:14:37 +0200 | [diff] [blame] | 916 | raw_spin_lock(&c3_lock); |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 917 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 918 | c3_cpu_count--; |
Thomas Gleixner | e12f65f | 2009-07-25 18:14:37 +0200 | [diff] [blame] | 919 | raw_spin_unlock(&c3_lock); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 920 | } |
| 921 | |
Julius Werner | a474a51 | 2012-11-27 14:17:58 +0100 | [diff] [blame] | 922 | sched_clock_idle_wakeup_event(0); |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 923 | |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 924 | if (cx->entry_method != ACPI_CSTATE_FFH) |
| 925 | current_thread_info()->status |= TS_POLLING; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 926 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 927 | lapic_timer_state_broadcast(pr, cx, 0); |
Deepthi Dharwar | e978aa7 | 2011-10-28 16:20:09 +0530 | [diff] [blame] | 928 | return index; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 929 | } |
| 930 | |
| 931 | struct cpuidle_driver acpi_idle_driver = { |
| 932 | .name = "acpi_idle", |
| 933 | .owner = THIS_MODULE, |
Julius Werner | a474a51 | 2012-11-27 14:17:58 +0100 | [diff] [blame] | 934 | .en_core_tk_irqen = 1, |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 935 | }; |
| 936 | |
| 937 | /** |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 938 | * acpi_processor_setup_cpuidle_cx - prepares and configures CPUIDLE |
| 939 | * device i.e. per-cpu data |
| 940 | * |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 941 | * @pr: the ACPI processor |
| 942 | */ |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 943 | static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 944 | { |
venkatesh.pallipadi@intel.com | 9a0b841 | 2008-01-31 17:35:06 -0800 | [diff] [blame] | 945 | int i, count = CPUIDLE_DRIVER_STATE_START; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 946 | struct acpi_processor_cx *cx; |
Deepthi Dharwar | 4202735 | 2011-10-28 16:20:33 +0530 | [diff] [blame] | 947 | struct cpuidle_state_usage *state_usage; |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 948 | struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 949 | |
| 950 | if (!pr->flags.power_setup_done) |
| 951 | return -EINVAL; |
| 952 | |
| 953 | if (pr->flags.power == 0) { |
| 954 | return -EINVAL; |
| 955 | } |
| 956 | |
Konrad Rzeszutek Wilk | b88a634 | 2013-01-16 23:40:07 +0100 | [diff] [blame] | 957 | if (!dev) |
| 958 | return -EINVAL; |
| 959 | |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 960 | dev->cpu = pr->id; |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 961 | |
Len Brown | 615dfd9 | 2009-04-23 23:21:29 -0400 | [diff] [blame] | 962 | if (max_cstate == 0) |
| 963 | max_cstate = 1; |
| 964 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 965 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
| 966 | cx = &pr->power.states[i]; |
Deepthi Dharwar | 4202735 | 2011-10-28 16:20:33 +0530 | [diff] [blame] | 967 | state_usage = &dev->states_usage[count]; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 968 | |
| 969 | if (!cx->valid) |
| 970 | continue; |
| 971 | |
| 972 | #ifdef CONFIG_HOTPLUG_CPU |
| 973 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
| 974 | !pr->flags.has_cst && |
| 975 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
| 976 | continue; |
| 977 | #endif |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 978 | |
Deepthi Dharwar | 4202735 | 2011-10-28 16:20:33 +0530 | [diff] [blame] | 979 | cpuidle_set_statedata(state_usage, cx); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 980 | |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 981 | count++; |
| 982 | if (count == CPUIDLE_STATE_MAX) |
| 983 | break; |
| 984 | } |
| 985 | |
| 986 | dev->state_count = count; |
| 987 | |
| 988 | if (!count) |
| 989 | return -EINVAL; |
| 990 | |
| 991 | return 0; |
| 992 | } |
| 993 | |
| 994 | /** |
| 995 | * acpi_processor_setup_cpuidle states- prepares and configures cpuidle |
| 996 | * global state data i.e. idle routines |
| 997 | * |
| 998 | * @pr: the ACPI processor |
| 999 | */ |
| 1000 | static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr) |
| 1001 | { |
| 1002 | int i, count = CPUIDLE_DRIVER_STATE_START; |
| 1003 | struct acpi_processor_cx *cx; |
| 1004 | struct cpuidle_state *state; |
| 1005 | struct cpuidle_driver *drv = &acpi_idle_driver; |
| 1006 | |
| 1007 | if (!pr->flags.power_setup_done) |
| 1008 | return -EINVAL; |
| 1009 | |
| 1010 | if (pr->flags.power == 0) |
| 1011 | return -EINVAL; |
| 1012 | |
| 1013 | drv->safe_state_index = -1; |
| 1014 | for (i = 0; i < CPUIDLE_STATE_MAX; i++) { |
| 1015 | drv->states[i].name[0] = '\0'; |
| 1016 | drv->states[i].desc[0] = '\0'; |
| 1017 | } |
| 1018 | |
| 1019 | if (max_cstate == 0) |
| 1020 | max_cstate = 1; |
| 1021 | |
| 1022 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
| 1023 | cx = &pr->power.states[i]; |
| 1024 | |
| 1025 | if (!cx->valid) |
| 1026 | continue; |
| 1027 | |
| 1028 | #ifdef CONFIG_HOTPLUG_CPU |
| 1029 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
| 1030 | !pr->flags.has_cst && |
| 1031 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
| 1032 | continue; |
| 1033 | #endif |
| 1034 | |
| 1035 | state = &drv->states[count]; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1036 | snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 1037 | strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1038 | state->exit_latency = cx->latency; |
Len Brown | 4963f62 | 2007-12-13 23:50:45 -0500 | [diff] [blame] | 1039 | state->target_residency = cx->latency * latency_factor; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1040 | |
| 1041 | state->flags = 0; |
| 1042 | switch (cx->type) { |
| 1043 | case ACPI_STATE_C1: |
Venki Pallipadi | 8e92b66 | 2008-02-29 10:24:32 -0800 | [diff] [blame] | 1044 | if (cx->entry_method == ACPI_CSTATE_FFH) |
| 1045 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1046 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1047 | state->enter = acpi_idle_enter_c1; |
Boris Ostrovsky | 1a022e3 | 2012-03-13 19:55:09 +0100 | [diff] [blame] | 1048 | state->enter_dead = acpi_idle_play_dead; |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1049 | drv->safe_state_index = count; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1050 | break; |
| 1051 | |
| 1052 | case ACPI_STATE_C2: |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1053 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1054 | state->enter = acpi_idle_enter_simple; |
Boris Ostrovsky | 1a022e3 | 2012-03-13 19:55:09 +0100 | [diff] [blame] | 1055 | state->enter_dead = acpi_idle_play_dead; |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1056 | drv->safe_state_index = count; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1057 | break; |
| 1058 | |
| 1059 | case ACPI_STATE_C3: |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1060 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1061 | state->enter = pr->flags.bm_check ? |
| 1062 | acpi_idle_enter_bm : |
| 1063 | acpi_idle_enter_simple; |
| 1064 | break; |
| 1065 | } |
| 1066 | |
| 1067 | count++; |
venkatesh.pallipadi@intel.com | 9a0b841 | 2008-01-31 17:35:06 -0800 | [diff] [blame] | 1068 | if (count == CPUIDLE_STATE_MAX) |
| 1069 | break; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1070 | } |
| 1071 | |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1072 | drv->state_count = count; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1073 | |
| 1074 | if (!count) |
| 1075 | return -EINVAL; |
| 1076 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1077 | return 0; |
| 1078 | } |
| 1079 | |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1080 | int acpi_processor_hotplug(struct acpi_processor *pr) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1081 | { |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1082 | int ret = 0; |
Wei Yongjun | e8b1b59 | 2012-10-08 08:40:42 +0800 | [diff] [blame] | 1083 | struct cpuidle_device *dev; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1084 | |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 1085 | if (disabled_by_idle_boot_param()) |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1086 | return 0; |
| 1087 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1088 | if (!pr) |
| 1089 | return -EINVAL; |
| 1090 | |
| 1091 | if (nocst) { |
| 1092 | return -ENODEV; |
| 1093 | } |
| 1094 | |
| 1095 | if (!pr->flags.power_setup_done) |
| 1096 | return -ENODEV; |
| 1097 | |
Wei Yongjun | e8b1b59 | 2012-10-08 08:40:42 +0800 | [diff] [blame] | 1098 | dev = per_cpu(acpi_cpuidle_device, pr->id); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1099 | cpuidle_pause_and_lock(); |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 1100 | cpuidle_disable_device(dev); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1101 | acpi_processor_get_power_info(pr); |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1102 | if (pr->flags.power) { |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1103 | acpi_processor_setup_cpuidle_cx(pr); |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 1104 | ret = cpuidle_enable_device(dev); |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1105 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1106 | cpuidle_resume_and_unlock(); |
| 1107 | |
| 1108 | return ret; |
| 1109 | } |
| 1110 | |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1111 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
| 1112 | { |
| 1113 | int cpu; |
| 1114 | struct acpi_processor *_pr; |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 1115 | struct cpuidle_device *dev; |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1116 | |
| 1117 | if (disabled_by_idle_boot_param()) |
| 1118 | return 0; |
| 1119 | |
| 1120 | if (!pr) |
| 1121 | return -EINVAL; |
| 1122 | |
| 1123 | if (nocst) |
| 1124 | return -ENODEV; |
| 1125 | |
| 1126 | if (!pr->flags.power_setup_done) |
| 1127 | return -ENODEV; |
| 1128 | |
| 1129 | /* |
| 1130 | * FIXME: Design the ACPI notification to make it once per |
| 1131 | * system instead of once per-cpu. This condition is a hack |
| 1132 | * to make the code that updates C-States be called once. |
| 1133 | */ |
| 1134 | |
Paul E. McKenney | 9505626 | 2012-02-28 13:27:44 -0800 | [diff] [blame] | 1135 | if (pr->id == 0 && cpuidle_get_driver() == &acpi_idle_driver) { |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1136 | |
| 1137 | cpuidle_pause_and_lock(); |
| 1138 | /* Protect against cpu-hotplug */ |
| 1139 | get_online_cpus(); |
| 1140 | |
| 1141 | /* Disable all cpuidle devices */ |
| 1142 | for_each_online_cpu(cpu) { |
| 1143 | _pr = per_cpu(processors, cpu); |
| 1144 | if (!_pr || !_pr->flags.power_setup_done) |
| 1145 | continue; |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 1146 | dev = per_cpu(acpi_cpuidle_device, cpu); |
| 1147 | cpuidle_disable_device(dev); |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1148 | } |
| 1149 | |
| 1150 | /* Populate Updated C-state information */ |
Thomas Schlichter | f427e5f | 2013-01-19 00:28:22 +0100 | [diff] [blame] | 1151 | acpi_processor_get_power_info(pr); |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1152 | acpi_processor_setup_cpuidle_states(pr); |
| 1153 | |
| 1154 | /* Enable all cpuidle devices */ |
| 1155 | for_each_online_cpu(cpu) { |
| 1156 | _pr = per_cpu(processors, cpu); |
| 1157 | if (!_pr || !_pr->flags.power_setup_done) |
| 1158 | continue; |
| 1159 | acpi_processor_get_power_info(_pr); |
| 1160 | if (_pr->flags.power) { |
| 1161 | acpi_processor_setup_cpuidle_cx(_pr); |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 1162 | dev = per_cpu(acpi_cpuidle_device, cpu); |
| 1163 | cpuidle_enable_device(dev); |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1164 | } |
| 1165 | } |
| 1166 | put_online_cpus(); |
| 1167 | cpuidle_resume_and_unlock(); |
| 1168 | } |
| 1169 | |
| 1170 | return 0; |
| 1171 | } |
| 1172 | |
| 1173 | static int acpi_processor_registered; |
| 1174 | |
Daniel Lezcano | 38a991b | 2012-09-15 22:42:54 +0200 | [diff] [blame] | 1175 | int __cpuinit acpi_processor_power_init(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1177 | acpi_status status = 0; |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1178 | int retval; |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 1179 | struct cpuidle_device *dev; |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 1180 | static int first_run; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 1182 | if (disabled_by_idle_boot_param()) |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1183 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | |
| 1185 | if (!first_run) { |
| 1186 | dmi_check_system(processor_power_dmi_table); |
Alexey Starikovskiy | c1c3063 | 2007-11-26 20:42:19 +0100 | [diff] [blame] | 1187 | max_cstate = acpi_processor_cstate_check(max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | if (max_cstate < ACPI_C_STATES_MAX) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1189 | printk(KERN_NOTICE |
| 1190 | "ACPI: processor limited to max C-state %d\n", |
| 1191 | max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | first_run++; |
| 1193 | } |
| 1194 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1195 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1196 | return -EINVAL; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1197 | |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1198 | if (acpi_gbl_FADT.cst_control && !nocst) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1199 | status = |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1200 | 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] | 1201 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1202 | ACPI_EXCEPTION((AE_INFO, status, |
| 1203 | "Notifying BIOS of _CST ability failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | } |
| 1205 | } |
| 1206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | acpi_processor_get_power_info(pr); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1208 | pr->flags.power_setup_done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | |
| 1210 | /* |
| 1211 | * Install the idle handler if processor power management is supported. |
| 1212 | * Note that we use previously set idle handler will be used on |
| 1213 | * platforms that only support C1. |
| 1214 | */ |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1215 | if (pr->flags.power) { |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1216 | /* Register acpi_idle_driver if not already registered */ |
| 1217 | if (!acpi_processor_registered) { |
| 1218 | acpi_processor_setup_cpuidle_states(pr); |
| 1219 | retval = cpuidle_register_driver(&acpi_idle_driver); |
| 1220 | if (retval) |
| 1221 | return retval; |
| 1222 | printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n", |
| 1223 | acpi_idle_driver.name); |
| 1224 | } |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 1225 | |
| 1226 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 1227 | if (!dev) |
| 1228 | return -ENOMEM; |
| 1229 | per_cpu(acpi_cpuidle_device, pr->id) = dev; |
| 1230 | |
| 1231 | acpi_processor_setup_cpuidle_cx(pr); |
| 1232 | |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1233 | /* Register per-cpu cpuidle_device. Cpuidle driver |
| 1234 | * must already be registered before registering device |
| 1235 | */ |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 1236 | retval = cpuidle_register_device(dev); |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1237 | if (retval) { |
| 1238 | if (acpi_processor_registered == 0) |
| 1239 | cpuidle_unregister_driver(&acpi_idle_driver); |
| 1240 | return retval; |
| 1241 | } |
| 1242 | acpi_processor_registered++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | } |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1244 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | } |
| 1246 | |
Daniel Lezcano | 38a991b | 2012-09-15 22:42:54 +0200 | [diff] [blame] | 1247 | int acpi_processor_power_exit(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | { |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 1249 | struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id); |
| 1250 | |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 1251 | if (disabled_by_idle_boot_param()) |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1252 | return 0; |
| 1253 | |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1254 | if (pr->flags.power) { |
Daniel Lezcano | 3d339dc | 2012-09-17 23:01:56 +0200 | [diff] [blame] | 1255 | cpuidle_unregister_device(dev); |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1256 | acpi_processor_registered--; |
| 1257 | if (acpi_processor_registered == 0) |
| 1258 | cpuidle_unregister_driver(&acpi_idle_driver); |
| 1259 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | |
Deepthi Dharwar | 46bcfad | 2011-10-28 16:20:42 +0530 | [diff] [blame] | 1261 | pr->flags.power_setup_done = 0; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1262 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | } |