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/proc_fs.h> |
| 37 | #include <linux/seq_file.h> |
| 38 | #include <linux/acpi.h> |
| 39 | #include <linux/dmi.h> |
| 40 | #include <linux/moduleparam.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 41 | #include <linux/sched.h> /* need_resched() */ |
Mark Gross | f011e2e | 2008-02-04 22:30:09 -0800 | [diff] [blame] | 42 | #include <linux/pm_qos_params.h> |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 43 | #include <linux/clockchips.h> |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 44 | #include <linux/cpuidle.h> |
Russell King | ba84be2 | 2009-01-06 14:41:07 -0800 | [diff] [blame] | 45 | #include <linux/irqflags.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Thomas Gleixner | 3434933 | 2007-02-16 01:27:54 -0800 | [diff] [blame] | 47 | /* |
| 48 | * Include the apic definitions for x86 to have the APIC timer related defines |
| 49 | * available also for UP (on SMP it gets magically included via linux/smp.h). |
| 50 | * asm/acpi.h is not an option, as it would require more include magic. Also |
| 51 | * creating an empty asm-ia64/apic.h would just trade pest vs. cholera. |
| 52 | */ |
| 53 | #ifdef CONFIG_X86 |
| 54 | #include <asm/apic.h> |
| 55 | #endif |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #include <asm/io.h> |
| 58 | #include <asm/uaccess.h> |
| 59 | |
| 60 | #include <acpi/acpi_bus.h> |
| 61 | #include <acpi/processor.h> |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 62 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Len Brown | a192a95 | 2009-07-28 16:45:54 -0400 | [diff] [blame] | 64 | #define PREFIX "ACPI: " |
| 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #define ACPI_PROCESSOR_CLASS "processor" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
Len Brown | f52fd66 | 2007-02-12 22:42:12 -0500 | [diff] [blame] | 68 | ACPI_MODULE_NAME("processor_idle"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #define ACPI_PROCESSOR_FILE_POWER "power" |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 70 | #define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 71 | #define C2_OVERHEAD 1 /* 1us */ |
| 72 | #define C3_OVERHEAD 1 /* 1us */ |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 73 | #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] | 74 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 75 | static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; |
| 76 | module_param(max_cstate, uint, 0000); |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 77 | static unsigned int nocst __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | module_param(nocst, uint, 0000); |
Len Brown | d3e7e99 | 2010-07-22 17:23:10 -0400 | [diff] [blame] | 79 | static int bm_check_disable __read_mostly; |
| 80 | module_param(bm_check_disable, uint, 0000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Len Brown | 25de571 | 2007-12-14 00:24:15 -0500 | [diff] [blame] | 82 | static unsigned int latency_factor __read_mostly = 2; |
Len Brown | 4963f62 | 2007-12-13 23:50:45 -0500 | [diff] [blame] | 83 | module_param(latency_factor, uint, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
KOSAKI Motohiro | 6c9c0fd | 2010-07-20 15:18:35 -0700 | [diff] [blame] | 85 | #ifdef CONFIG_ACPI_PROCFS |
Venkatesh Pallipadi | bceefad | 2010-06-02 10:01:09 -0700 | [diff] [blame] | 86 | static u64 us_to_pm_timer_ticks(s64 t) |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 87 | { |
| 88 | return div64_u64(t * PM_TIMER_FREQUENCY, 1000000); |
| 89 | } |
KOSAKI Motohiro | 6c9c0fd | 2010-07-20 15:18:35 -0700 | [diff] [blame] | 90 | #endif |
| 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | /* |
| 93 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. |
| 94 | * For now disable this. Probably a bug somewhere else. |
| 95 | * |
| 96 | * To skip this limit, boot/load with a large max_cstate limit. |
| 97 | */ |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 98 | static int set_max_cstate(const struct dmi_system_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | { |
| 100 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) |
| 101 | return 0; |
| 102 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 103 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 104 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
| 105 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 107 | max_cstate = (long)id->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
| 109 | return 0; |
| 110 | } |
| 111 | |
Ashok Raj | 7ded568 | 2006-02-03 21:51:23 +0100 | [diff] [blame] | 112 | /* Actually this shouldn't be __cpuinitdata, would be better to fix the |
| 113 | callers to only run once -AK */ |
| 114 | static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 115 | { set_max_cstate, "Clevo 5600D", { |
| 116 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 117 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 118 | (void *)2}, |
Arjan van de Ven | 370d5cd | 2010-01-27 15:25:39 -0800 | [diff] [blame] | 119 | { set_max_cstate, "Pavilion zv5000", { |
| 120 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
| 121 | DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")}, |
| 122 | (void *)1}, |
| 123 | { set_max_cstate, "Asus L8400B", { |
| 124 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), |
| 125 | DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")}, |
| 126 | (void *)1}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | {}, |
| 128 | }; |
| 129 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 130 | |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 131 | /* |
| 132 | * Callers should disable interrupts before the call and enable |
| 133 | * interrupts after return. |
| 134 | */ |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 135 | static void acpi_safe_halt(void) |
| 136 | { |
| 137 | current_thread_info()->status &= ~TS_POLLING; |
| 138 | /* |
| 139 | * TS_POLLING-cleared state must be visible before we |
| 140 | * test NEED_RESCHED: |
| 141 | */ |
| 142 | smp_mb(); |
Venki Pallipadi | 71e93d1 | 2008-03-13 17:18:19 -0700 | [diff] [blame] | 143 | if (!need_resched()) { |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 144 | safe_halt(); |
Venki Pallipadi | 71e93d1 | 2008-03-13 17:18:19 -0700 | [diff] [blame] | 145 | local_irq_disable(); |
| 146 | } |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 147 | current_thread_info()->status |= TS_POLLING; |
| 148 | } |
| 149 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 150 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
| 151 | |
| 152 | /* |
| 153 | * Some BIOS implementations switch to C3 in the published C2 state. |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 154 | * This seems to be a common problem on AMD boxen, but other vendors |
| 155 | * are affected too. We pick the most conservative approach: we assume |
| 156 | * that the local APIC stops in both C2 and C3. |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 157 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 158 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 159 | struct acpi_processor_cx *cx) |
| 160 | { |
| 161 | struct acpi_processor_power *pwr = &pr->power; |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 162 | 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] | 163 | |
Venkatesh Pallipadi | db954b5 | 2009-04-06 18:51:29 -0700 | [diff] [blame] | 164 | if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT)) |
| 165 | return; |
| 166 | |
Michal Schmidt | e8c534e | 2010-07-27 18:53:35 +0200 | [diff] [blame] | 167 | if (c1e_detected) |
Shaohua Li | 87ad57ba | 2009-05-19 16:09:42 +0800 | [diff] [blame] | 168 | type = ACPI_STATE_C1; |
| 169 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 170 | /* |
| 171 | * Check, if one of the previous states already marked the lapic |
| 172 | * unstable |
| 173 | */ |
| 174 | if (pwr->timer_broadcast_on_state < state) |
| 175 | return; |
| 176 | |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 177 | if (cx->type >= type) |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 178 | pr->power.timer_broadcast_on_state = state; |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 179 | } |
| 180 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 181 | static void __lapic_timer_propagate_broadcast(void *arg) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 182 | { |
Suresh Siddha | f833bab | 2009-08-17 14:34:59 -0700 | [diff] [blame] | 183 | struct acpi_processor *pr = (struct acpi_processor *) arg; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 184 | unsigned long reason; |
| 185 | |
| 186 | reason = pr->power.timer_broadcast_on_state < INT_MAX ? |
| 187 | CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; |
| 188 | |
| 189 | clockevents_notify(reason, &pr->id); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 190 | } |
| 191 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 192 | static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) |
| 193 | { |
| 194 | smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast, |
| 195 | (void *)pr, 1); |
| 196 | } |
| 197 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 198 | /* Power(C) State timer broadcast control */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 199 | static void lapic_timer_state_broadcast(struct acpi_processor *pr, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 200 | struct acpi_processor_cx *cx, |
| 201 | int broadcast) |
| 202 | { |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 203 | int state = cx - pr->power.states; |
| 204 | |
| 205 | if (state >= pr->power.timer_broadcast_on_state) { |
| 206 | unsigned long reason; |
| 207 | |
| 208 | reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : |
| 209 | CLOCK_EVT_NOTIFY_BROADCAST_EXIT; |
| 210 | clockevents_notify(reason, &pr->id); |
| 211 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | #else |
| 215 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 216 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 217 | struct acpi_processor_cx *cstate) { } |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 218 | static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { } |
| 219 | static void lapic_timer_state_broadcast(struct acpi_processor *pr, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 220 | struct acpi_processor_cx *cx, |
| 221 | int broadcast) |
| 222 | { |
| 223 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 224 | |
| 225 | #endif |
| 226 | |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 227 | /* |
| 228 | * Suspend / resume control |
| 229 | */ |
| 230 | static int acpi_idle_suspend; |
Len Brown | 815ab0f | 2009-05-07 22:19:45 -0400 | [diff] [blame] | 231 | static u32 saved_bm_rld; |
| 232 | |
| 233 | static void acpi_idle_bm_rld_save(void) |
| 234 | { |
| 235 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); |
| 236 | } |
| 237 | static void acpi_idle_bm_rld_restore(void) |
| 238 | { |
| 239 | u32 resumed_bm_rld; |
| 240 | |
| 241 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); |
| 242 | |
| 243 | if (resumed_bm_rld != saved_bm_rld) |
| 244 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); |
| 245 | } |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 246 | |
| 247 | int acpi_processor_suspend(struct acpi_device * device, pm_message_t state) |
| 248 | { |
Len Brown | 815ab0f | 2009-05-07 22:19:45 -0400 | [diff] [blame] | 249 | if (acpi_idle_suspend == 1) |
| 250 | return 0; |
| 251 | |
| 252 | acpi_idle_bm_rld_save(); |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 253 | acpi_idle_suspend = 1; |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | int acpi_processor_resume(struct acpi_device * device) |
| 258 | { |
Len Brown | 815ab0f | 2009-05-07 22:19:45 -0400 | [diff] [blame] | 259 | if (acpi_idle_suspend == 0) |
| 260 | return 0; |
| 261 | |
| 262 | acpi_idle_bm_rld_restore(); |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 263 | acpi_idle_suspend = 0; |
| 264 | return 0; |
| 265 | } |
| 266 | |
John Stultz | 592913e | 2010-07-13 17:56:20 -0700 | [diff] [blame] | 267 | #if defined(CONFIG_X86) |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 268 | static void tsc_check_state(int state) |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 269 | { |
| 270 | switch (boot_cpu_data.x86_vendor) { |
| 271 | case X86_VENDOR_AMD: |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 272 | case X86_VENDOR_INTEL: |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 273 | /* |
| 274 | * AMD Fam10h TSC will tick in all |
| 275 | * C/P/S0/S1 states when this bit is set. |
| 276 | */ |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 277 | if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 278 | return; |
Venki Pallipadi | 40fb171 | 2008-11-17 16:11:37 -0800 | [diff] [blame] | 279 | |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 280 | /*FALL THROUGH*/ |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 281 | default: |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 282 | /* TSC could halt in idle, so notify users */ |
| 283 | if (state > ACPI_STATE_C1) |
| 284 | mark_tsc_unstable("TSC halts in idle"); |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 285 | } |
| 286 | } |
Len Brown | 520daf7 | 2009-05-14 17:27:38 -0400 | [diff] [blame] | 287 | #else |
| 288 | static void tsc_check_state(int state) { return; } |
Andi Kleen | ddb25f9 | 2008-01-30 13:32:41 +0100 | [diff] [blame] | 289 | #endif |
| 290 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 291 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
| 294 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 295 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
| 297 | if (!pr->pblk) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 298 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | /* if info is obtained from pblk/fadt, type equals state */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
| 302 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; |
| 303 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 304 | #ifndef CONFIG_HOTPLUG_CPU |
| 305 | /* |
| 306 | * Check for P_LVL2_UP flag before entering C2 and above on |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 307 | * an SMP system. |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 308 | */ |
Alexey Starikovskiy | ad71860a | 2007-02-02 19:48:19 +0300 | [diff] [blame] | 309 | if ((num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 310 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 311 | return -ENODEV; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 312 | #endif |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | /* determine C2 and C3 address from pblk */ |
| 315 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; |
| 316 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; |
| 317 | |
| 318 | /* determine latencies from FADT */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 319 | pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency; |
| 320 | pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
Len Brown | 5d76b6f | 2010-01-19 22:41:14 -0500 | [diff] [blame] | 322 | /* |
| 323 | * FADT specified C2 latency must be less than or equal to |
| 324 | * 100 microseconds. |
| 325 | */ |
| 326 | if (acpi_gbl_FADT.C2latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { |
| 327 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 328 | "C2 latency too large [%d]\n", acpi_gbl_FADT.C2latency)); |
| 329 | /* invalidate C2 */ |
| 330 | pr->power.states[ACPI_STATE_C2].address = 0; |
| 331 | } |
| 332 | |
Len Brown | a6d72c1 | 2010-01-19 23:10:04 -0500 | [diff] [blame] | 333 | /* |
| 334 | * FADT supplied C3 latency must be less than or equal to |
| 335 | * 1000 microseconds. |
| 336 | */ |
| 337 | if (acpi_gbl_FADT.C3latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { |
| 338 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 339 | "C3 latency too large [%d]\n", acpi_gbl_FADT.C3latency)); |
| 340 | /* invalidate C3 */ |
| 341 | pr->power.states[ACPI_STATE_C3].address = 0; |
| 342 | } |
| 343 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 345 | "lvl2[0x%08x] lvl3[0x%08x]\n", |
| 346 | pr->power.states[ACPI_STATE_C2].address, |
| 347 | pr->power.states[ACPI_STATE_C3].address)); |
| 348 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 349 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
| 351 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 352 | static int acpi_processor_get_power_info_default(struct acpi_processor *pr) |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 353 | { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 354 | if (!pr->power.states[ACPI_STATE_C1].valid) { |
| 355 | /* set the first C-State to C1 */ |
| 356 | /* all processors need to support C1 */ |
| 357 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; |
| 358 | pr->power.states[ACPI_STATE_C1].valid = 1; |
Venkatesh Pallipadi | 0fda6b4 | 2008-04-09 21:31:46 -0400 | [diff] [blame] | 359 | pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 360 | } |
| 361 | /* the C0 state only exists as a filler in our array */ |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 362 | pr->power.states[ACPI_STATE_C0].valid = 1; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 363 | return 0; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 364 | } |
| 365 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 366 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 368 | acpi_status status = 0; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 369 | u64 count; |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 370 | int current_count; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 371 | int i; |
| 372 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 373 | union acpi_object *cst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | if (nocst) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 377 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 379 | current_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
| 381 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); |
| 382 | if (ACPI_FAILURE(status)) { |
| 383 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 384 | return -ENODEV; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 385 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 387 | cst = buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
| 389 | /* There must be at least 2 elements */ |
| 390 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 391 | printk(KERN_ERR PREFIX "not enough elements in _CST\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | status = -EFAULT; |
| 393 | goto end; |
| 394 | } |
| 395 | |
| 396 | count = cst->package.elements[0].integer.value; |
| 397 | |
| 398 | /* Validate number of power states. */ |
| 399 | if (count < 1 || count != cst->package.count - 1) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 400 | printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | status = -EFAULT; |
| 402 | goto end; |
| 403 | } |
| 404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | /* Tell driver that at least _CST is supported. */ |
| 406 | pr->flags.has_cst = 1; |
| 407 | |
| 408 | for (i = 1; i <= count; i++) { |
| 409 | union acpi_object *element; |
| 410 | union acpi_object *obj; |
| 411 | struct acpi_power_register *reg; |
| 412 | struct acpi_processor_cx cx; |
| 413 | |
| 414 | memset(&cx, 0, sizeof(cx)); |
| 415 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 416 | element = &(cst->package.elements[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | if (element->type != ACPI_TYPE_PACKAGE) |
| 418 | continue; |
| 419 | |
| 420 | if (element->package.count != 4) |
| 421 | continue; |
| 422 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 423 | obj = &(element->package.elements[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
| 425 | if (obj->type != ACPI_TYPE_BUFFER) |
| 426 | continue; |
| 427 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 428 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
| 430 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 431 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | continue; |
| 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | /* There should be an easy way to extract an integer... */ |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 435 | obj = &(element->package.elements[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | if (obj->type != ACPI_TYPE_INTEGER) |
| 437 | continue; |
| 438 | |
| 439 | cx.type = obj->integer.value; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 440 | /* |
| 441 | * Some buggy BIOSes won't list C1 in _CST - |
| 442 | * Let acpi_processor_get_power_info_default() handle them later |
| 443 | */ |
| 444 | if (i == 1 && cx.type != ACPI_STATE_C1) |
| 445 | current_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 447 | cx.address = reg->address; |
| 448 | cx.index = current_count + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 450 | cx.entry_method = ACPI_CSTATE_SYSTEMIO; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 451 | if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { |
| 452 | if (acpi_processor_ffh_cstate_probe |
| 453 | (pr->id, &cx, reg) == 0) { |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 454 | cx.entry_method = ACPI_CSTATE_FFH; |
| 455 | } else if (cx.type == ACPI_STATE_C1) { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 456 | /* |
| 457 | * C1 is a special case where FIXED_HARDWARE |
| 458 | * can be handled in non-MWAIT way as well. |
| 459 | * In that case, save this _CST entry info. |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 460 | * Otherwise, ignore this info and continue. |
| 461 | */ |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 462 | cx.entry_method = ACPI_CSTATE_HALT; |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 463 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 464 | } else { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 465 | continue; |
| 466 | } |
Zhao Yakui | da5e09a | 2008-06-24 18:01:09 +0800 | [diff] [blame] | 467 | if (cx.type == ACPI_STATE_C1 && |
| 468 | (idle_halt || idle_nomwait)) { |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 469 | /* |
| 470 | * In most cases the C1 space_id obtained from |
| 471 | * _CST object is FIXED_HARDWARE access mode. |
| 472 | * But when the option of idle=halt is added, |
| 473 | * the entry_method type should be changed from |
| 474 | * CSTATE_FFH to CSTATE_HALT. |
Zhao Yakui | da5e09a | 2008-06-24 18:01:09 +0800 | [diff] [blame] | 475 | * When the option of idle=nomwait is added, |
| 476 | * the C1 entry_method type should be |
| 477 | * CSTATE_HALT. |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 478 | */ |
| 479 | cx.entry_method = ACPI_CSTATE_HALT; |
| 480 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
| 481 | } |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 482 | } else { |
| 483 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", |
| 484 | cx.address); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 485 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | |
Venkatesh Pallipadi | 0fda6b4 | 2008-04-09 21:31:46 -0400 | [diff] [blame] | 487 | if (cx.type == ACPI_STATE_C1) { |
| 488 | cx.valid = 1; |
| 489 | } |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 490 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 491 | obj = &(element->package.elements[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | if (obj->type != ACPI_TYPE_INTEGER) |
| 493 | continue; |
| 494 | |
| 495 | cx.latency = obj->integer.value; |
| 496 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 497 | obj = &(element->package.elements[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | if (obj->type != ACPI_TYPE_INTEGER) |
| 499 | continue; |
| 500 | |
| 501 | cx.power = obj->integer.value; |
| 502 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 503 | current_count++; |
| 504 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); |
| 505 | |
| 506 | /* |
| 507 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 |
| 508 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) |
| 509 | */ |
| 510 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { |
| 511 | printk(KERN_WARNING |
| 512 | "Limiting number of power states to max (%d)\n", |
| 513 | ACPI_PROCESSOR_MAX_POWER); |
| 514 | printk(KERN_WARNING |
| 515 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); |
| 516 | break; |
| 517 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | } |
| 519 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 520 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 521 | current_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | |
| 523 | /* Validate number of power states discovered */ |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 524 | if (current_count < 2) |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 525 | status = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 527 | end: |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 528 | kfree(buffer.pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 530 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | } |
| 532 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 533 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
| 534 | struct acpi_processor_cx *cx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | { |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 536 | static int bm_check_flag = -1; |
| 537 | static int bm_control_flag = -1; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 538 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
| 540 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 541 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
| 543 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) |
| 545 | * DMA transfers are used by any ISA device to avoid livelock. |
| 546 | * Note that we could disable Type-F DMA (as recommended by |
| 547 | * the erratum), but this is known to disrupt certain ISA |
| 548 | * devices thus we take the conservative approach. |
| 549 | */ |
| 550 | else if (errata.piix4.fdma) { |
| 551 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 552 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 553 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | } |
| 555 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 556 | /* 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] | 557 | if (bm_check_flag == -1) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 558 | /* Determine whether bm_check is needed based on CPU */ |
| 559 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); |
| 560 | bm_check_flag = pr->flags.bm_check; |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 561 | bm_control_flag = pr->flags.bm_control; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 562 | } else { |
| 563 | pr->flags.bm_check = bm_check_flag; |
Pallipadi, Venkatesh | ee1ca48 | 2009-05-21 17:09:10 -0700 | [diff] [blame] | 564 | pr->flags.bm_control = bm_control_flag; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 565 | } |
| 566 | |
| 567 | if (pr->flags.bm_check) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 568 | if (!pr->flags.bm_control) { |
Venki Pallipadi | ed3110e | 2007-07-31 12:04:31 -0700 | [diff] [blame] | 569 | if (pr->flags.has_cst != 1) { |
| 570 | /* bus mastering control is necessary */ |
| 571 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 572 | "C3 support requires BM control\n")); |
| 573 | return; |
| 574 | } else { |
| 575 | /* Here we enter C3 without bus mastering */ |
| 576 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 577 | "C3 support without BM control\n")); |
| 578 | } |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 579 | } |
| 580 | } else { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 581 | /* |
| 582 | * WBINVD should be set in fadt, for C3 state to be |
| 583 | * supported on when bm_check is not required. |
| 584 | */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 585 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 586 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 587 | "Cache invalidation should work properly" |
| 588 | " for C3 to be enabled on SMP systems\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 589 | return; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 590 | } |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 591 | } |
| 592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | /* |
| 594 | * Otherwise we've met all of our C3 requirements. |
| 595 | * Normalize the C3 latency to expidite policy. Enable |
| 596 | * checking of bus mastering status (bm_check) so we can |
| 597 | * use this in our C3 policy |
| 598 | */ |
| 599 | cx->valid = 1; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 600 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 601 | cx->latency_ticks = cx->latency; |
Len Brown | 31878dd | 2009-01-28 18:28:09 -0500 | [diff] [blame] | 602 | /* |
| 603 | * On older chipsets, BM_RLD needs to be set |
| 604 | * in order for Bus Master activity to wake the |
| 605 | * system from C3. Newer chipsets handle DMA |
| 606 | * during C3 automatically and BM_RLD is a NOP. |
| 607 | * In either case, the proper way to |
| 608 | * handle BM_RLD is to set it and leave it set. |
| 609 | */ |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 610 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 612 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | } |
| 614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
| 616 | { |
| 617 | unsigned int i; |
| 618 | unsigned int working = 0; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 619 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 620 | pr->power.timer_broadcast_on_state = INT_MAX; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 621 | |
Len Brown | a0bf284 | 2009-05-15 01:29:31 -0400 | [diff] [blame] | 622 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
| 624 | |
| 625 | switch (cx->type) { |
| 626 | case ACPI_STATE_C1: |
| 627 | cx->valid = 1; |
| 628 | break; |
| 629 | |
| 630 | case ACPI_STATE_C2: |
Len Brown | d22edd2 | 2010-01-19 23:29:09 -0500 | [diff] [blame] | 631 | if (!cx->address) |
| 632 | break; |
| 633 | cx->valid = 1; |
| 634 | cx->latency_ticks = cx->latency; /* Normalize latency */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | break; |
| 636 | |
| 637 | case ACPI_STATE_C3: |
| 638 | acpi_processor_power_verify_c3(pr, cx); |
| 639 | break; |
| 640 | } |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 641 | if (!cx->valid) |
| 642 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 644 | lapic_timer_check_state(i, pr, cx); |
| 645 | tsc_check_state(cx->type); |
| 646 | working++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | } |
| 648 | |
Hidetoshi Seto | 918aae4 | 2009-12-14 17:10:06 +0900 | [diff] [blame] | 649 | lapic_timer_propagate_broadcast(pr); |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | return (working); |
| 652 | } |
| 653 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 654 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | { |
| 656 | unsigned int i; |
| 657 | int result; |
| 658 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
| 660 | /* NOTE: the idle thread may not be running while calling |
| 661 | * this function */ |
| 662 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 663 | /* Zero initialize all the C-states info. */ |
| 664 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
| 665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | result = acpi_processor_get_power_info_cst(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 667 | if (result == -ENODEV) |
Darrick J. Wong | c5a114f | 2006-10-19 23:28:28 -0700 | [diff] [blame] | 668 | result = acpi_processor_get_power_info_fadt(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 669 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 670 | if (result) |
| 671 | return result; |
| 672 | |
| 673 | acpi_processor_get_power_info_default(pr); |
| 674 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 675 | pr->power.count = acpi_processor_power_verify(pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | /* |
| 678 | * if one state of type C2 or C3 is available, mark this |
| 679 | * CPU as being "idle manageable" |
| 680 | */ |
| 681 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 682 | if (pr->power.states[i].valid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | pr->power.count = i; |
Linus Torvalds | 2203d6e | 2005-11-18 07:29:51 -0800 | [diff] [blame] | 684 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
| 685 | pr->flags.power = 1; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 686 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | } |
| 688 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 689 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | } |
| 691 | |
Zhao Yakui | 74cad4e | 2009-06-24 11:49:49 +0800 | [diff] [blame] | 692 | #ifdef CONFIG_ACPI_PROCFS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) |
| 694 | { |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 695 | struct acpi_processor *pr = seq->private; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 696 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
| 699 | if (!pr) |
| 700 | goto end; |
| 701 | |
| 702 | seq_printf(seq, "active state: C%zd\n" |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 703 | "max_cstate: C%d\n" |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 704 | "maximum allowed latency: %d usec\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 705 | pr->power.state ? pr->power.state - pr->power.states : 0, |
Mark Gross | ed77134 | 2010-05-06 01:59:26 +0200 | [diff] [blame] | 706 | max_cstate, pm_qos_request(PM_QOS_CPU_DMA_LATENCY)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
| 708 | seq_puts(seq, "states:\n"); |
| 709 | |
| 710 | for (i = 1; i <= pr->power.count; i++) { |
| 711 | seq_printf(seq, " %cC%d: ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 712 | (&pr->power.states[i] == |
| 713 | pr->power.state ? '*' : ' '), i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
| 715 | if (!pr->power.states[i].valid) { |
| 716 | seq_puts(seq, "<not supported>\n"); |
| 717 | continue; |
| 718 | } |
| 719 | |
| 720 | switch (pr->power.states[i].type) { |
| 721 | case ACPI_STATE_C1: |
| 722 | seq_printf(seq, "type[C1] "); |
| 723 | break; |
| 724 | case ACPI_STATE_C2: |
| 725 | seq_printf(seq, "type[C2] "); |
| 726 | break; |
| 727 | case ACPI_STATE_C3: |
| 728 | seq_printf(seq, "type[C3] "); |
| 729 | break; |
| 730 | default: |
| 731 | seq_printf(seq, "type[--] "); |
| 732 | break; |
| 733 | } |
| 734 | |
Len Brown | 34a18d6 | 2010-05-21 19:40:02 -0400 | [diff] [blame] | 735 | seq_puts(seq, "promotion[--] "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | |
Len Brown | 34a18d6 | 2010-05-21 19:40:02 -0400 | [diff] [blame] | 737 | seq_puts(seq, "demotion[--] "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | |
Venkatesh Pallipadi | bceefad | 2010-06-02 10:01:09 -0700 | [diff] [blame] | 739 | seq_printf(seq, "latency[%03d] usage[%08d] duration[%020Lu]\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 740 | pr->power.states[i].latency, |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 741 | pr->power.states[i].usage, |
Venkatesh Pallipadi | bceefad | 2010-06-02 10:01:09 -0700 | [diff] [blame] | 742 | us_to_pm_timer_ticks(pr->power.states[i].time)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | } |
| 744 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 745 | end: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 746 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | } |
| 748 | |
| 749 | static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) |
| 750 | { |
| 751 | return single_open(file, acpi_processor_power_seq_show, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 752 | PDE(inode)->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | } |
| 754 | |
Arjan van de Ven | d750803 | 2006-07-04 13:06:00 -0400 | [diff] [blame] | 755 | static const struct file_operations acpi_processor_power_fops = { |
Denis V. Lunev | cf7acfa | 2008-04-29 01:02:27 -0700 | [diff] [blame] | 756 | .owner = THIS_MODULE, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 757 | .open = acpi_processor_power_open_fs, |
| 758 | .read = seq_read, |
| 759 | .llseek = seq_lseek, |
| 760 | .release = single_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | }; |
Zhao Yakui | 74cad4e | 2009-06-24 11:49:49 +0800 | [diff] [blame] | 762 | #endif |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 763 | |
| 764 | /** |
| 765 | * acpi_idle_bm_check - checks if bus master activity was detected |
| 766 | */ |
| 767 | static int acpi_idle_bm_check(void) |
| 768 | { |
| 769 | u32 bm_status = 0; |
| 770 | |
Len Brown | d3e7e99 | 2010-07-22 17:23:10 -0400 | [diff] [blame] | 771 | if (bm_check_disable) |
| 772 | return 0; |
| 773 | |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 774 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 775 | if (bm_status) |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 776 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 777 | /* |
| 778 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect |
| 779 | * the true state of bus mastering activity; forcing us to |
| 780 | * manually check the BMIDEA bit of each IDE channel. |
| 781 | */ |
| 782 | else if (errata.piix4.bmisx) { |
| 783 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) |
| 784 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
| 785 | bm_status = 1; |
| 786 | } |
| 787 | return bm_status; |
| 788 | } |
| 789 | |
| 790 | /** |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 791 | * acpi_idle_do_entry - a helper function that does C2 and C3 type entry |
| 792 | * @cx: cstate data |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 793 | * |
| 794 | * Caller disables interrupt before call and enables interrupt after return. |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 795 | */ |
| 796 | static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) |
| 797 | { |
Steven Rostedt | dcf3099 | 2008-07-25 18:00:42 -0400 | [diff] [blame] | 798 | /* Don't trace irqs off for idle */ |
| 799 | stop_critical_timings(); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 800 | if (cx->entry_method == ACPI_CSTATE_FFH) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 801 | /* Call into architectural FFH based C-state */ |
| 802 | acpi_processor_ffh_cstate_enter(cx); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 803 | } else if (cx->entry_method == ACPI_CSTATE_HALT) { |
| 804 | acpi_safe_halt(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 805 | } else { |
| 806 | int unused; |
| 807 | /* IO port based C-state */ |
| 808 | inb(cx->address); |
| 809 | /* Dummy wait op - must do something useless after P_LVL2 read |
| 810 | because chipsets cannot guarantee that STPCLK# signal |
| 811 | gets asserted in time to freeze execution properly. */ |
| 812 | unused = inl(acpi_gbl_FADT.xpm_timer_block.address); |
| 813 | } |
Steven Rostedt | dcf3099 | 2008-07-25 18:00:42 -0400 | [diff] [blame] | 814 | start_critical_timings(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 815 | } |
| 816 | |
| 817 | /** |
| 818 | * acpi_idle_enter_c1 - enters an ACPI C1 state-type |
| 819 | * @dev: the target CPU |
| 820 | * @state: the state data |
| 821 | * |
| 822 | * This is equivalent to the HALT instruction. |
| 823 | */ |
| 824 | static int acpi_idle_enter_c1(struct cpuidle_device *dev, |
| 825 | struct cpuidle_state *state) |
| 826 | { |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 827 | ktime_t kt1, kt2; |
| 828 | s64 idle_time; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 829 | struct acpi_processor *pr; |
| 830 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
venkatesh.pallipadi@intel.com | 9b12e18 | 2008-01-31 17:35:05 -0800 | [diff] [blame] | 831 | |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 832 | pr = __get_cpu_var(processors); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 833 | |
| 834 | if (unlikely(!pr)) |
| 835 | return 0; |
| 836 | |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 837 | local_irq_disable(); |
Venkatesh Pallipadi | b077fba | 2008-02-11 15:20:27 -0800 | [diff] [blame] | 838 | |
| 839 | /* Do not access any ACPI IO ports in suspend path */ |
| 840 | if (acpi_idle_suspend) { |
Venkatesh Pallipadi | b077fba | 2008-02-11 15:20:27 -0800 | [diff] [blame] | 841 | local_irq_enable(); |
Shaohua Li | 7d60e8a | 2009-05-19 16:09:54 +0800 | [diff] [blame] | 842 | cpu_relax(); |
Venkatesh Pallipadi | b077fba | 2008-02-11 15:20:27 -0800 | [diff] [blame] | 843 | return 0; |
| 844 | } |
| 845 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 846 | lapic_timer_state_broadcast(pr, cx, 1); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 847 | kt1 = ktime_get_real(); |
venkatesh.pallipadi@intel.com | bc71bec | 2008-01-31 17:35:04 -0800 | [diff] [blame] | 848 | acpi_idle_do_entry(cx); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 849 | kt2 = ktime_get_real(); |
| 850 | idle_time = ktime_to_us(ktime_sub(kt2, kt1)); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 851 | |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 852 | local_irq_enable(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 853 | cx->usage++; |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 854 | lapic_timer_state_broadcast(pr, cx, 0); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 855 | |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 856 | return idle_time; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 857 | } |
| 858 | |
| 859 | /** |
| 860 | * acpi_idle_enter_simple - enters an ACPI state without BM handling |
| 861 | * @dev: the target CPU |
| 862 | * @state: the state data |
| 863 | */ |
| 864 | static int acpi_idle_enter_simple(struct cpuidle_device *dev, |
| 865 | struct cpuidle_state *state) |
| 866 | { |
| 867 | struct acpi_processor *pr; |
| 868 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 869 | ktime_t kt1, kt2; |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 870 | s64 idle_time_ns; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 871 | s64 idle_time; |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 872 | |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 873 | pr = __get_cpu_var(processors); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 874 | |
| 875 | if (unlikely(!pr)) |
| 876 | return 0; |
| 877 | |
Len Brown | e196441 | 2007-10-04 01:23:47 -0400 | [diff] [blame] | 878 | if (acpi_idle_suspend) |
| 879 | return(acpi_idle_enter_c1(dev, state)); |
| 880 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 881 | local_irq_disable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 882 | |
Pallipadi, Venkatesh | d306ebc | 2010-02-10 10:35:31 -0800 | [diff] [blame] | 883 | if (cx->entry_method != ACPI_CSTATE_FFH) { |
| 884 | current_thread_info()->status &= ~TS_POLLING; |
| 885 | /* |
| 886 | * TS_POLLING-cleared state must be visible before we test |
| 887 | * NEED_RESCHED: |
| 888 | */ |
| 889 | smp_mb(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 890 | |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 891 | if (unlikely(need_resched())) { |
| 892 | current_thread_info()->status |= TS_POLLING; |
| 893 | local_irq_enable(); |
| 894 | return 0; |
| 895 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 896 | } |
| 897 | |
Thomas Gleixner | e17bcb4 | 2007-12-07 19:16:17 +0100 | [diff] [blame] | 898 | /* |
| 899 | * Must be done before busmaster disable as we might need to |
| 900 | * access HPET ! |
| 901 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 902 | lapic_timer_state_broadcast(pr, cx, 1); |
Thomas Gleixner | e17bcb4 | 2007-12-07 19:16:17 +0100 | [diff] [blame] | 903 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 904 | if (cx->type == ACPI_STATE_C3) |
| 905 | ACPI_FLUSH_CPU_CACHE(); |
| 906 | |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 907 | kt1 = ktime_get_real(); |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 908 | /* Tell the scheduler that we are going deep-idle: */ |
| 909 | sched_clock_idle_sleep_event(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 910 | acpi_idle_do_entry(cx); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 911 | kt2 = ktime_get_real(); |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 912 | idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1)); |
| 913 | idle_time = idle_time_ns; |
| 914 | do_div(idle_time, NSEC_PER_USEC); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 915 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 916 | /* Tell the scheduler how much we idled: */ |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 917 | sched_clock_idle_wakeup_event(idle_time_ns); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 918 | |
| 919 | local_irq_enable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 920 | if (cx->entry_method != ACPI_CSTATE_FFH) |
| 921 | current_thread_info()->status |= TS_POLLING; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 922 | |
| 923 | cx->usage++; |
| 924 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 925 | lapic_timer_state_broadcast(pr, cx, 0); |
Venkatesh Pallipadi | bceefad | 2010-06-02 10:01:09 -0700 | [diff] [blame] | 926 | cx->time += idle_time; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 927 | return idle_time; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 928 | } |
| 929 | |
| 930 | static int c3_cpu_count; |
| 931 | static DEFINE_SPINLOCK(c3_lock); |
| 932 | |
| 933 | /** |
| 934 | * acpi_idle_enter_bm - enters C3 with proper BM handling |
| 935 | * @dev: the target CPU |
| 936 | * @state: the state data |
| 937 | * |
| 938 | * If BM is detected, the deepest non-C3 idle state is entered instead. |
| 939 | */ |
| 940 | static int acpi_idle_enter_bm(struct cpuidle_device *dev, |
| 941 | struct cpuidle_state *state) |
| 942 | { |
| 943 | struct acpi_processor *pr; |
| 944 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 945 | ktime_t kt1, kt2; |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 946 | s64 idle_time_ns; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 947 | s64 idle_time; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 948 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 949 | |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 950 | pr = __get_cpu_var(processors); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 951 | |
| 952 | if (unlikely(!pr)) |
| 953 | return 0; |
| 954 | |
Len Brown | e196441 | 2007-10-04 01:23:47 -0400 | [diff] [blame] | 955 | if (acpi_idle_suspend) |
| 956 | return(acpi_idle_enter_c1(dev, state)); |
| 957 | |
Len Brown | 718be4a | 2010-07-22 16:54:27 -0400 | [diff] [blame] | 958 | if (!cx->bm_sts_skip && acpi_idle_bm_check()) { |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 959 | if (dev->safe_state) { |
Venkatesh Pallipadi | addbad4 | 2008-09-29 15:24:28 -0700 | [diff] [blame] | 960 | dev->last_state = dev->safe_state; |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 961 | return dev->safe_state->enter(dev, dev->safe_state); |
| 962 | } else { |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 963 | local_irq_disable(); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 964 | acpi_safe_halt(); |
venkatesh.pallipadi@intel.com | 2e90665 | 2008-01-31 17:35:03 -0800 | [diff] [blame] | 965 | local_irq_enable(); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 966 | return 0; |
| 967 | } |
| 968 | } |
| 969 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 970 | local_irq_disable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 971 | |
Pallipadi, Venkatesh | d306ebc | 2010-02-10 10:35:31 -0800 | [diff] [blame] | 972 | if (cx->entry_method != ACPI_CSTATE_FFH) { |
| 973 | current_thread_info()->status &= ~TS_POLLING; |
| 974 | /* |
| 975 | * TS_POLLING-cleared state must be visible before we test |
| 976 | * NEED_RESCHED: |
| 977 | */ |
| 978 | smp_mb(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 979 | |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 980 | if (unlikely(need_resched())) { |
| 981 | current_thread_info()->status |= TS_POLLING; |
| 982 | local_irq_enable(); |
| 983 | return 0; |
| 984 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 985 | } |
| 986 | |
Venki Pallipadi | 996520c | 2008-03-24 14:24:10 -0700 | [diff] [blame] | 987 | acpi_unlazy_tlb(smp_processor_id()); |
| 988 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 989 | /* Tell the scheduler that we are going deep-idle: */ |
| 990 | sched_clock_idle_sleep_event(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 991 | /* |
| 992 | * Must be done before busmaster disable as we might need to |
| 993 | * access HPET ! |
| 994 | */ |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 995 | lapic_timer_state_broadcast(pr, cx, 1); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 996 | |
Len Brown | f461dde | 2009-04-23 18:59:43 -0400 | [diff] [blame] | 997 | kt1 = ktime_get_real(); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 998 | /* |
| 999 | * disable bus master |
| 1000 | * bm_check implies we need ARB_DIS |
| 1001 | * !bm_check implies we need cache flush |
| 1002 | * bm_control implies whether we can do ARB_DIS |
| 1003 | * |
| 1004 | * That leaves a case where bm_check is set and bm_control is |
| 1005 | * not set. In that case we cannot do much, we enter C3 |
| 1006 | * without doing anything. |
| 1007 | */ |
| 1008 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1009 | spin_lock(&c3_lock); |
| 1010 | c3_cpu_count++; |
| 1011 | /* Disable bus master arbitration when all CPUs are in C3 */ |
| 1012 | if (c3_cpu_count == num_online_cpus()) |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 1013 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1014 | spin_unlock(&c3_lock); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1015 | } else if (!pr->flags.bm_check) { |
| 1016 | ACPI_FLUSH_CPU_CACHE(); |
| 1017 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1018 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1019 | acpi_idle_do_entry(cx); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1020 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1021 | /* Re-enable bus master arbitration */ |
| 1022 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1023 | spin_lock(&c3_lock); |
Bob Moore | 50ffba1 | 2009-02-23 15:02:07 +0800 | [diff] [blame] | 1024 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1025 | c3_cpu_count--; |
| 1026 | spin_unlock(&c3_lock); |
| 1027 | } |
Len Brown | f461dde | 2009-04-23 18:59:43 -0400 | [diff] [blame] | 1028 | kt2 = ktime_get_real(); |
Zhao Yakui | 157317b | 2010-06-02 11:04:09 +0800 | [diff] [blame] | 1029 | idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1)); |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 1030 | idle_time = idle_time_ns; |
| 1031 | do_div(idle_time, NSEC_PER_USEC); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1032 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 1033 | /* Tell the scheduler how much we idled: */ |
Venkatesh Pallipadi | 2da513f | 2010-04-22 16:48:33 -0700 | [diff] [blame] | 1034 | sched_clock_idle_wakeup_event(idle_time_ns); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1035 | |
| 1036 | local_irq_enable(); |
Len Brown | 02cf4f9 | 2010-05-24 14:27:44 -0400 | [diff] [blame] | 1037 | if (cx->entry_method != ACPI_CSTATE_FFH) |
| 1038 | current_thread_info()->status |= TS_POLLING; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1039 | |
| 1040 | cx->usage++; |
| 1041 | |
Len Brown | 7e275cc | 2009-05-15 02:08:44 -0400 | [diff] [blame] | 1042 | lapic_timer_state_broadcast(pr, cx, 0); |
Venkatesh Pallipadi | bceefad | 2010-06-02 10:01:09 -0700 | [diff] [blame] | 1043 | cx->time += idle_time; |
alex.shi | ff69f2b | 2009-03-04 11:55:26 -0800 | [diff] [blame] | 1044 | return idle_time; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1045 | } |
| 1046 | |
| 1047 | struct cpuidle_driver acpi_idle_driver = { |
| 1048 | .name = "acpi_idle", |
| 1049 | .owner = THIS_MODULE, |
| 1050 | }; |
| 1051 | |
| 1052 | /** |
| 1053 | * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE |
| 1054 | * @pr: the ACPI processor |
| 1055 | */ |
| 1056 | static int acpi_processor_setup_cpuidle(struct acpi_processor *pr) |
| 1057 | { |
venkatesh.pallipadi@intel.com | 9a0b841 | 2008-01-31 17:35:06 -0800 | [diff] [blame] | 1058 | int i, count = CPUIDLE_DRIVER_STATE_START; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1059 | struct acpi_processor_cx *cx; |
| 1060 | struct cpuidle_state *state; |
| 1061 | struct cpuidle_device *dev = &pr->power.dev; |
| 1062 | |
| 1063 | if (!pr->flags.power_setup_done) |
| 1064 | return -EINVAL; |
| 1065 | |
| 1066 | if (pr->flags.power == 0) { |
| 1067 | return -EINVAL; |
| 1068 | } |
| 1069 | |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1070 | dev->cpu = pr->id; |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 1071 | for (i = 0; i < CPUIDLE_STATE_MAX; i++) { |
| 1072 | dev->states[i].name[0] = '\0'; |
| 1073 | dev->states[i].desc[0] = '\0'; |
| 1074 | } |
| 1075 | |
Len Brown | 615dfd9 | 2009-04-23 23:21:29 -0400 | [diff] [blame] | 1076 | if (max_cstate == 0) |
| 1077 | max_cstate = 1; |
| 1078 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1079 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
| 1080 | cx = &pr->power.states[i]; |
| 1081 | state = &dev->states[count]; |
| 1082 | |
| 1083 | if (!cx->valid) |
| 1084 | continue; |
| 1085 | |
| 1086 | #ifdef CONFIG_HOTPLUG_CPU |
| 1087 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
| 1088 | !pr->flags.has_cst && |
| 1089 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
| 1090 | continue; |
| 1091 | #endif |
| 1092 | cpuidle_set_statedata(state, cx); |
| 1093 | |
| 1094 | snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); |
Venkatesh Pallipadi | 4fcb2fc | 2008-02-11 17:46:31 -0800 | [diff] [blame] | 1095 | strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1096 | state->exit_latency = cx->latency; |
Len Brown | 4963f62 | 2007-12-13 23:50:45 -0500 | [diff] [blame] | 1097 | state->target_residency = cx->latency * latency_factor; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1098 | state->power_usage = cx->power; |
| 1099 | |
| 1100 | state->flags = 0; |
| 1101 | switch (cx->type) { |
| 1102 | case ACPI_STATE_C1: |
| 1103 | state->flags |= CPUIDLE_FLAG_SHALLOW; |
Venki Pallipadi | 8e92b66 | 2008-02-29 10:24:32 -0800 | [diff] [blame] | 1104 | if (cx->entry_method == ACPI_CSTATE_FFH) |
| 1105 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1106 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1107 | state->enter = acpi_idle_enter_c1; |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1108 | dev->safe_state = state; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1109 | break; |
| 1110 | |
| 1111 | case ACPI_STATE_C2: |
| 1112 | state->flags |= CPUIDLE_FLAG_BALANCED; |
| 1113 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1114 | state->enter = acpi_idle_enter_simple; |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1115 | dev->safe_state = state; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1116 | break; |
| 1117 | |
| 1118 | case ACPI_STATE_C3: |
| 1119 | state->flags |= CPUIDLE_FLAG_DEEP; |
| 1120 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1121 | state->flags |= CPUIDLE_FLAG_CHECK_BM; |
| 1122 | state->enter = pr->flags.bm_check ? |
| 1123 | acpi_idle_enter_bm : |
| 1124 | acpi_idle_enter_simple; |
| 1125 | break; |
| 1126 | } |
| 1127 | |
| 1128 | count++; |
venkatesh.pallipadi@intel.com | 9a0b841 | 2008-01-31 17:35:06 -0800 | [diff] [blame] | 1129 | if (count == CPUIDLE_STATE_MAX) |
| 1130 | break; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1131 | } |
| 1132 | |
| 1133 | dev->state_count = count; |
| 1134 | |
| 1135 | if (!count) |
| 1136 | return -EINVAL; |
| 1137 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1138 | return 0; |
| 1139 | } |
| 1140 | |
| 1141 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
| 1142 | { |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1143 | int ret = 0; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1144 | |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1145 | if (boot_option_idle_override) |
| 1146 | return 0; |
| 1147 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1148 | if (!pr) |
| 1149 | return -EINVAL; |
| 1150 | |
| 1151 | if (nocst) { |
| 1152 | return -ENODEV; |
| 1153 | } |
| 1154 | |
| 1155 | if (!pr->flags.power_setup_done) |
| 1156 | return -ENODEV; |
| 1157 | |
| 1158 | cpuidle_pause_and_lock(); |
| 1159 | cpuidle_disable_device(&pr->power.dev); |
| 1160 | acpi_processor_get_power_info(pr); |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1161 | if (pr->flags.power) { |
| 1162 | acpi_processor_setup_cpuidle(pr); |
| 1163 | ret = cpuidle_enable_device(&pr->power.dev); |
| 1164 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1165 | cpuidle_resume_and_unlock(); |
| 1166 | |
| 1167 | return ret; |
| 1168 | } |
| 1169 | |
Pierre Ossman | 7af8b66 | 2006-10-10 14:20:31 -0700 | [diff] [blame] | 1170 | int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1171 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1173 | acpi_status status = 0; |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 1174 | static int first_run; |
Len Brown | b188e4c | 2009-06-24 01:48:32 -0400 | [diff] [blame] | 1175 | #ifdef CONFIG_ACPI_PROCFS |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1176 | struct proc_dir_entry *entry = NULL; |
Len Brown | b188e4c | 2009-06-24 01:48:32 -0400 | [diff] [blame] | 1177 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1179 | if (boot_option_idle_override) |
| 1180 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | |
| 1182 | if (!first_run) { |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 1183 | if (idle_halt) { |
| 1184 | /* |
| 1185 | * When the boot option of "idle=halt" is added, halt |
| 1186 | * is used for CPU IDLE. |
| 1187 | * In such case C2/C3 is meaningless. So the max_cstate |
| 1188 | * is set to one. |
| 1189 | */ |
| 1190 | max_cstate = 1; |
| 1191 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | dmi_check_system(processor_power_dmi_table); |
Alexey Starikovskiy | c1c3063 | 2007-11-26 20:42:19 +0100 | [diff] [blame] | 1193 | max_cstate = acpi_processor_cstate_check(max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | if (max_cstate < ACPI_C_STATES_MAX) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1195 | printk(KERN_NOTICE |
| 1196 | "ACPI: processor limited to max C-state %d\n", |
| 1197 | max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | first_run++; |
| 1199 | } |
| 1200 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1201 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1202 | return -EINVAL; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1203 | |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1204 | if (acpi_gbl_FADT.cst_control && !nocst) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1205 | status = |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1206 | 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] | 1207 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1208 | ACPI_EXCEPTION((AE_INFO, status, |
| 1209 | "Notifying BIOS of _CST ability failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | } |
| 1211 | } |
| 1212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | acpi_processor_get_power_info(pr); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1214 | pr->flags.power_setup_done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | |
| 1216 | /* |
| 1217 | * Install the idle handler if processor power management is supported. |
| 1218 | * Note that we use previously set idle handler will be used on |
| 1219 | * platforms that only support C1. |
| 1220 | */ |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1221 | if (pr->flags.power) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1222 | acpi_processor_setup_cpuidle(pr); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1223 | if (cpuidle_register_device(&pr->power.dev)) |
| 1224 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | } |
Zhao Yakui | 74cad4e | 2009-06-24 11:49:49 +0800 | [diff] [blame] | 1226 | #ifdef CONFIG_ACPI_PROCFS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | /* 'power' [R] */ |
Denis V. Lunev | cf7acfa | 2008-04-29 01:02:27 -0700 | [diff] [blame] | 1228 | entry = proc_create_data(ACPI_PROCESSOR_FILE_POWER, |
| 1229 | S_IRUGO, acpi_device_dir(device), |
| 1230 | &acpi_processor_power_fops, |
| 1231 | acpi_driver_data(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | if (!entry) |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1233 | return -EIO; |
Zhao Yakui | 74cad4e | 2009-06-24 11:49:49 +0800 | [diff] [blame] | 1234 | #endif |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1235 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | } |
| 1237 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1238 | int acpi_processor_power_exit(struct acpi_processor *pr, |
| 1239 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | { |
Venkatesh Pallipadi | 36a9135 | 2008-04-30 13:57:15 -0400 | [diff] [blame] | 1241 | if (boot_option_idle_override) |
| 1242 | return 0; |
| 1243 | |
Venkatesh Pallipadi | dcb84f3 | 2008-05-19 19:09:27 -0400 | [diff] [blame] | 1244 | cpuidle_unregister_device(&pr->power.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | pr->flags.power_setup_done = 0; |
| 1246 | |
Zhao Yakui | 74cad4e | 2009-06-24 11:49:49 +0800 | [diff] [blame] | 1247 | #ifdef CONFIG_ACPI_PROCFS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | if (acpi_device_dir(device)) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1249 | remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
| 1250 | acpi_device_dir(device)); |
Zhao Yakui | 74cad4e | 2009-06-24 11:49:49 +0800 | [diff] [blame] | 1251 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1253 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | } |