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> |
| 35 | #include <linux/proc_fs.h> |
| 36 | #include <linux/seq_file.h> |
| 37 | #include <linux/acpi.h> |
| 38 | #include <linux/dmi.h> |
| 39 | #include <linux/moduleparam.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 40 | #include <linux/sched.h> /* need_resched() */ |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 41 | #include <linux/latency.h> |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 42 | #include <linux/clockchips.h> |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 43 | #include <linux/cpuidle.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> |
| 60 | |
| 61 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 |
| 62 | #define ACPI_PROCESSOR_CLASS "processor" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
Len Brown | f52fd66 | 2007-02-12 22:42:12 -0500 | [diff] [blame] | 64 | ACPI_MODULE_NAME("processor_idle"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #define ACPI_PROCESSOR_FILE_POWER "power" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000) |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 67 | #define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY) |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 68 | #ifndef CONFIG_CPU_IDLE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */ |
| 70 | #define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */ |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 71 | static void (*pm_idle_save) (void) __read_mostly; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 72 | #else |
| 73 | #define C2_OVERHEAD 1 /* 1us */ |
| 74 | #define C3_OVERHEAD 1 /* 1us */ |
| 75 | #endif |
| 76 | #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] | 77 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 78 | static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; |
Venki Pallipadi | 5b3f0e6 | 2008-01-07 17:50:10 -0500 | [diff] [blame] | 79 | #ifdef CONFIG_CPU_IDLE |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 80 | module_param(max_cstate, uint, 0000); |
Venki Pallipadi | 5b3f0e6 | 2008-01-07 17:50:10 -0500 | [diff] [blame] | 81 | #else |
| 82 | module_param(max_cstate, uint, 0644); |
| 83 | #endif |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 84 | static unsigned int nocst __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | module_param(nocst, uint, 0000); |
| 86 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 87 | #ifndef CONFIG_CPU_IDLE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | /* |
| 89 | * bm_history -- bit-mask with a bit per jiffy of bus-master activity |
| 90 | * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms |
| 91 | * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms |
| 92 | * 100 HZ: 0x0000000F: 4 jiffies = 40ms |
| 93 | * reduce history for more aggressive entry into C3 |
| 94 | */ |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 95 | static unsigned int bm_history __read_mostly = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 96 | (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | module_param(bm_history, uint, 0644); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 98 | |
| 99 | static int acpi_processor_set_power_policy(struct acpi_processor *pr); |
| 100 | |
| 101 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | /* |
| 104 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. |
| 105 | * For now disable this. Probably a bug somewhere else. |
| 106 | * |
| 107 | * To skip this limit, boot/load with a large max_cstate limit. |
| 108 | */ |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 109 | static int set_max_cstate(const struct dmi_system_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | { |
| 111 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) |
| 112 | return 0; |
| 113 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 114 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 115 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
| 116 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 118 | max_cstate = (long)id->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | return 0; |
| 121 | } |
| 122 | |
Ashok Raj | 7ded568 | 2006-02-03 21:51:23 +0100 | [diff] [blame] | 123 | /* Actually this shouldn't be __cpuinitdata, would be better to fix the |
| 124 | callers to only run once -AK */ |
| 125 | static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 126 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 127 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
Bartlomiej Swiercz | f831335 | 2006-05-29 07:16:00 -0400 | [diff] [blame] | 128 | DMI_MATCH(DMI_BIOS_VERSION,"1SET70WW")}, (void *)1}, |
| 129 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 130 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 131 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1}, |
| 132 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 133 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 134 | DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1}, |
| 135 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 136 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 137 | DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1}, |
| 138 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 139 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 140 | DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1}, |
| 141 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 142 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 143 | DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1}, |
| 144 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 145 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 146 | DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1}, |
| 147 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 148 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 149 | DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1}, |
| 150 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 151 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 152 | DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1}, |
| 153 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 154 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 155 | DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1}, |
| 156 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 157 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 158 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1}, |
| 159 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 160 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 161 | DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1}, |
| 162 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 163 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 164 | DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1}, |
| 165 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 166 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 167 | DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1}, |
| 168 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 169 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 170 | DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1}, |
| 171 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 172 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 173 | DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1}, |
| 174 | { set_max_cstate, "Medion 41700", { |
| 175 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 176 | DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1}, |
| 177 | { set_max_cstate, "Clevo 5600D", { |
| 178 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 179 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 180 | (void *)2}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | {}, |
| 182 | }; |
| 183 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 184 | static inline u32 ticks_elapsed(u32 t1, u32 t2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
| 186 | if (t2 >= t1) |
| 187 | return (t2 - t1); |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 188 | else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); |
| 190 | else |
| 191 | return ((0xFFFFFFFF - t1) + t2); |
| 192 | } |
| 193 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 194 | static inline u32 ticks_elapsed_in_us(u32 t1, u32 t2) |
| 195 | { |
| 196 | if (t2 >= t1) |
| 197 | return PM_TIMER_TICKS_TO_US(t2 - t1); |
| 198 | else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER)) |
| 199 | return PM_TIMER_TICKS_TO_US(((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); |
| 200 | else |
| 201 | return PM_TIMER_TICKS_TO_US((0xFFFFFFFF - t1) + t2); |
| 202 | } |
| 203 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 204 | static void acpi_safe_halt(void) |
| 205 | { |
| 206 | current_thread_info()->status &= ~TS_POLLING; |
| 207 | /* |
| 208 | * TS_POLLING-cleared state must be visible before we |
| 209 | * test NEED_RESCHED: |
| 210 | */ |
| 211 | smp_mb(); |
| 212 | if (!need_resched()) |
| 213 | safe_halt(); |
| 214 | current_thread_info()->status |= TS_POLLING; |
| 215 | } |
| 216 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 217 | #ifndef CONFIG_CPU_IDLE |
| 218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | static void |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 220 | acpi_processor_power_activate(struct acpi_processor *pr, |
| 221 | struct acpi_processor_cx *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 223 | struct acpi_processor_cx *old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
| 225 | if (!pr || !new) |
| 226 | return; |
| 227 | |
| 228 | old = pr->power.state; |
| 229 | |
| 230 | if (old) |
| 231 | old->promotion.count = 0; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 232 | new->demotion.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
| 234 | /* Cleanup from old state. */ |
| 235 | if (old) { |
| 236 | switch (old->type) { |
| 237 | case ACPI_STATE_C3: |
| 238 | /* Disable bus master reload */ |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 239 | if (new->type != ACPI_STATE_C3 && pr->flags.bm_check) |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 240 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | break; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | /* Prepare to use new state. */ |
| 246 | switch (new->type) { |
| 247 | case ACPI_STATE_C3: |
| 248 | /* Enable bus master reload */ |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 249 | if (old->type != ACPI_STATE_C3 && pr->flags.bm_check) |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 250 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | break; |
| 252 | } |
| 253 | |
| 254 | pr->power.state = new; |
| 255 | |
| 256 | return; |
| 257 | } |
| 258 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 259 | static atomic_t c3_cpu_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 261 | /* Common C-state entry for C2, C3, .. */ |
| 262 | static void acpi_cstate_enter(struct acpi_processor_cx *cstate) |
| 263 | { |
| 264 | if (cstate->space_id == ACPI_CSTATE_FFH) { |
| 265 | /* Call into architectural FFH based C-state */ |
| 266 | acpi_processor_ffh_cstate_enter(cstate); |
| 267 | } else { |
| 268 | int unused; |
| 269 | /* IO port based C-state */ |
| 270 | inb(cstate->address); |
| 271 | /* Dummy wait op - must do something useless after P_LVL2 read |
| 272 | because chipsets cannot guarantee that STPCLK# signal |
| 273 | gets asserted in time to freeze execution properly. */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 274 | unused = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 275 | } |
| 276 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 277 | #endif /* !CONFIG_CPU_IDLE */ |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 278 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 279 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
| 280 | |
| 281 | /* |
| 282 | * Some BIOS implementations switch to C3 in the published C2 state. |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 283 | * This seems to be a common problem on AMD boxen, but other vendors |
| 284 | * are affected too. We pick the most conservative approach: we assume |
| 285 | * that the local APIC stops in both C2 and C3. |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 286 | */ |
| 287 | static void acpi_timer_check_state(int state, struct acpi_processor *pr, |
| 288 | struct acpi_processor_cx *cx) |
| 289 | { |
| 290 | struct acpi_processor_power *pwr = &pr->power; |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 291 | 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] | 292 | |
| 293 | /* |
| 294 | * Check, if one of the previous states already marked the lapic |
| 295 | * unstable |
| 296 | */ |
| 297 | if (pwr->timer_broadcast_on_state < state) |
| 298 | return; |
| 299 | |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 300 | if (cx->type >= type) |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 301 | pr->power.timer_broadcast_on_state = state; |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 302 | } |
| 303 | |
| 304 | static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) |
| 305 | { |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 306 | unsigned long reason; |
| 307 | |
| 308 | reason = pr->power.timer_broadcast_on_state < INT_MAX ? |
| 309 | CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; |
| 310 | |
| 311 | clockevents_notify(reason, &pr->id); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | /* Power(C) State timer broadcast control */ |
| 315 | static void acpi_state_timer_broadcast(struct acpi_processor *pr, |
| 316 | struct acpi_processor_cx *cx, |
| 317 | int broadcast) |
| 318 | { |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 319 | int state = cx - pr->power.states; |
| 320 | |
| 321 | if (state >= pr->power.timer_broadcast_on_state) { |
| 322 | unsigned long reason; |
| 323 | |
| 324 | reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : |
| 325 | CLOCK_EVT_NOTIFY_BROADCAST_EXIT; |
| 326 | clockevents_notify(reason, &pr->id); |
| 327 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | #else |
| 331 | |
| 332 | static void acpi_timer_check_state(int state, struct acpi_processor *pr, |
| 333 | struct acpi_processor_cx *cstate) { } |
| 334 | static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) { } |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 335 | static void acpi_state_timer_broadcast(struct acpi_processor *pr, |
| 336 | struct acpi_processor_cx *cx, |
| 337 | int broadcast) |
| 338 | { |
| 339 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 340 | |
| 341 | #endif |
| 342 | |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 343 | /* |
| 344 | * Suspend / resume control |
| 345 | */ |
| 346 | static int acpi_idle_suspend; |
| 347 | |
| 348 | int acpi_processor_suspend(struct acpi_device * device, pm_message_t state) |
| 349 | { |
| 350 | acpi_idle_suspend = 1; |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | int acpi_processor_resume(struct acpi_device * device) |
| 355 | { |
| 356 | acpi_idle_suspend = 0; |
| 357 | return 0; |
| 358 | } |
| 359 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 360 | #ifndef CONFIG_CPU_IDLE |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 361 | static void acpi_processor_idle(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 363 | struct acpi_processor *pr = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | struct acpi_processor_cx *cx = NULL; |
| 365 | struct acpi_processor_cx *next_state = NULL; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 366 | int sleep_ticks = 0; |
| 367 | u32 t1, t2 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | /* |
| 370 | * Interrupts must be disabled during bus mastering calculations and |
| 371 | * for C2/C3 transitions. |
| 372 | */ |
| 373 | local_irq_disable(); |
| 374 | |
Venkatesh Pallipadi | d5a3d32 | 2007-06-15 19:36:00 -0400 | [diff] [blame] | 375 | pr = processors[smp_processor_id()]; |
| 376 | if (!pr) { |
| 377 | local_irq_enable(); |
| 378 | return; |
| 379 | } |
| 380 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | /* |
| 382 | * Check whether we truly need to go idle, or should |
| 383 | * reschedule: |
| 384 | */ |
| 385 | if (unlikely(need_resched())) { |
| 386 | local_irq_enable(); |
| 387 | return; |
| 388 | } |
| 389 | |
| 390 | cx = pr->power.state; |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame] | 391 | if (!cx || acpi_idle_suspend) { |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 392 | if (pm_idle_save) |
| 393 | pm_idle_save(); |
| 394 | else |
| 395 | acpi_safe_halt(); |
| 396 | return; |
| 397 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
| 399 | /* |
| 400 | * Check BM Activity |
| 401 | * ----------------- |
| 402 | * Check for bus mastering activity (if required), record, and check |
| 403 | * for demotion. |
| 404 | */ |
| 405 | if (pr->flags.bm_check) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 406 | u32 bm_status = 0; |
| 407 | unsigned long diff = jiffies - pr->power.bm_check_timestamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 409 | if (diff > 31) |
| 410 | diff = 31; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 412 | pr->power.bm_activity <<= diff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 414 | acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | if (bm_status) { |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 416 | pr->power.bm_activity |= 0x1; |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 417 | acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } |
| 419 | /* |
| 420 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect |
| 421 | * the true state of bus mastering activity; forcing us to |
| 422 | * manually check the BMIDEA bit of each IDE channel. |
| 423 | */ |
| 424 | else if (errata.piix4.bmisx) { |
| 425 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 426 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 427 | pr->power.bm_activity |= 0x1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | pr->power.bm_check_timestamp = jiffies; |
| 431 | |
| 432 | /* |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 433 | * If bus mastering is or was active this jiffy, demote |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | * to avoid a faulty transition. Note that the processor |
| 435 | * won't enter a low-power state during this call (to this |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 436 | * function) but should upon the next. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | * |
| 438 | * TBD: A better policy might be to fallback to the demotion |
| 439 | * state (use it for this quantum only) istead of |
| 440 | * demoting -- and rely on duration as our sole demotion |
| 441 | * qualification. This may, however, introduce DMA |
| 442 | * issues (e.g. floppy DMA transfer overrun/underrun). |
| 443 | */ |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 444 | if ((pr->power.bm_activity & 0x1) && |
| 445 | cx->demotion.threshold.bm) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | local_irq_enable(); |
| 447 | next_state = cx->demotion.state; |
| 448 | goto end; |
| 449 | } |
| 450 | } |
| 451 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 452 | #ifdef CONFIG_HOTPLUG_CPU |
| 453 | /* |
| 454 | * Check for P_LVL2_UP flag before entering C2 and above on |
| 455 | * an SMP system. We do it here instead of doing it at _CST/P_LVL |
| 456 | * detection phase, to work cleanly with logical CPU hotplug. |
| 457 | */ |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 458 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 459 | !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 460 | cx = &pr->power.states[ACPI_STATE_C1]; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 461 | #endif |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | /* |
| 464 | * Sleep: |
| 465 | * ------ |
| 466 | * Invoke the current Cx state to put the processor to sleep. |
| 467 | */ |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 468 | if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 469 | current_thread_info()->status &= ~TS_POLLING; |
Ingo Molnar | 0888f06a | 2006-12-22 01:11:56 -0800 | [diff] [blame] | 470 | /* |
| 471 | * TS_POLLING-cleared state must be visible before we |
| 472 | * test NEED_RESCHED: |
| 473 | */ |
| 474 | smp_mb(); |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 475 | if (need_resched()) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 476 | current_thread_info()->status |= TS_POLLING; |
Linus Torvalds | af2eb17 | 2005-12-02 23:09:06 -0800 | [diff] [blame] | 477 | local_irq_enable(); |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 478 | return; |
| 479 | } |
| 480 | } |
| 481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | switch (cx->type) { |
| 483 | |
| 484 | case ACPI_STATE_C1: |
| 485 | /* |
| 486 | * Invoke C1. |
| 487 | * Use the appropriate idle routine, the one that would |
| 488 | * be used without acpi C-states. |
| 489 | */ |
| 490 | if (pm_idle_save) |
| 491 | pm_idle_save(); |
| 492 | else |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 493 | acpi_safe_halt(); |
| 494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | /* |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 496 | * TBD: Can't get time duration while in C1, as resumes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | * go to an ISR rather than here. Need to instrument |
| 498 | * base interrupt handler. |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 499 | * |
| 500 | * Note: the TSC better not stop in C1, sched_clock() will |
| 501 | * skew otherwise. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | */ |
| 503 | sleep_ticks = 0xFFFFFFFF; |
| 504 | break; |
| 505 | |
| 506 | case ACPI_STATE_C2: |
| 507 | /* Get start time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 508 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 509 | /* Tell the scheduler that we are going deep-idle: */ |
| 510 | sched_clock_idle_sleep_event(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | /* Invoke C2 */ |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 512 | acpi_state_timer_broadcast(pr, cx, 1); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 513 | acpi_cstate_enter(cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | /* Get end time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 515 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 516 | |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 517 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC) |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 518 | /* TSC halts in C2, so notify users */ |
john stultz | 5a90cf2 | 2007-05-02 19:27:08 +0200 | [diff] [blame] | 519 | mark_tsc_unstable("possible TSC halt in C2"); |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 520 | #endif |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 521 | /* Compute time (ticks) that we were actually asleep */ |
| 522 | sleep_ticks = ticks_elapsed(t1, t2); |
| 523 | |
| 524 | /* Tell the scheduler how much we idled: */ |
| 525 | sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); |
| 526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | /* Re-enable interrupts */ |
| 528 | local_irq_enable(); |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 529 | /* Do not account our idle-switching overhead: */ |
| 530 | sleep_ticks -= cx->latency_ticks + C2_OVERHEAD; |
| 531 | |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 532 | current_thread_info()->status |= TS_POLLING; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 533 | acpi_state_timer_broadcast(pr, cx, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | break; |
| 535 | |
| 536 | case ACPI_STATE_C3: |
Venki Pallipadi | bde6f5f | 2008-01-30 13:32:01 +0100 | [diff] [blame^] | 537 | acpi_unlazy_tlb(smp_processor_id()); |
Venkatesh Pallipadi | 18eab85 | 2007-06-15 19:37:00 -0400 | [diff] [blame] | 538 | /* |
Thomas Gleixner | e17bcb4 | 2007-12-07 19:16:17 +0100 | [diff] [blame] | 539 | * Must be done before busmaster disable as we might |
| 540 | * need to access HPET ! |
| 541 | */ |
| 542 | acpi_state_timer_broadcast(pr, cx, 1); |
| 543 | /* |
Venkatesh Pallipadi | 18eab85 | 2007-06-15 19:37:00 -0400 | [diff] [blame] | 544 | * disable bus master |
| 545 | * bm_check implies we need ARB_DIS |
| 546 | * !bm_check implies we need cache flush |
| 547 | * bm_control implies whether we can do ARB_DIS |
| 548 | * |
| 549 | * That leaves a case where bm_check is set and bm_control is |
| 550 | * not set. In that case we cannot do much, we enter C3 |
| 551 | * without doing anything. |
| 552 | */ |
| 553 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 554 | if (atomic_inc_return(&c3_cpu_count) == |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 555 | num_online_cpus()) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 556 | /* |
| 557 | * All CPUs are trying to go to C3 |
| 558 | * Disable bus master arbitration |
| 559 | */ |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 560 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 561 | } |
Venkatesh Pallipadi | 18eab85 | 2007-06-15 19:37:00 -0400 | [diff] [blame] | 562 | } else if (!pr->flags.bm_check) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 563 | /* SMP with no shared cache... Invalidate cache */ |
| 564 | ACPI_FLUSH_CPU_CACHE(); |
| 565 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | /* Get start time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 568 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | /* Invoke C3 */ |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 570 | /* Tell the scheduler that we are going deep-idle: */ |
| 571 | sched_clock_idle_sleep_event(); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 572 | acpi_cstate_enter(cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | /* Get end time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 574 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Venkatesh Pallipadi | 18eab85 | 2007-06-15 19:37:00 -0400 | [diff] [blame] | 575 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 576 | /* Enable bus master arbitration */ |
| 577 | atomic_dec(&c3_cpu_count); |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 578 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 579 | } |
| 580 | |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 581 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC) |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 582 | /* TSC halts in C3, so notify users */ |
john stultz | 5a90cf2 | 2007-05-02 19:27:08 +0200 | [diff] [blame] | 583 | mark_tsc_unstable("TSC halts in C3"); |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 584 | #endif |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 585 | /* Compute time (ticks) that we were actually asleep */ |
| 586 | sleep_ticks = ticks_elapsed(t1, t2); |
| 587 | /* Tell the scheduler how much we idled: */ |
| 588 | sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); |
| 589 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | /* Re-enable interrupts */ |
| 591 | local_irq_enable(); |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 592 | /* Do not account our idle-switching overhead: */ |
| 593 | sleep_ticks -= cx->latency_ticks + C3_OVERHEAD; |
| 594 | |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 595 | current_thread_info()->status |= TS_POLLING; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 596 | acpi_state_timer_broadcast(pr, cx, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | break; |
| 598 | |
| 599 | default: |
| 600 | local_irq_enable(); |
| 601 | return; |
| 602 | } |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 603 | cx->usage++; |
| 604 | if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0)) |
| 605 | cx->time += sleep_ticks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
| 607 | next_state = pr->power.state; |
| 608 | |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 609 | #ifdef CONFIG_HOTPLUG_CPU |
| 610 | /* Don't do promotion/demotion */ |
| 611 | if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 612 | !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) { |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 613 | next_state = cx; |
| 614 | goto end; |
| 615 | } |
| 616 | #endif |
| 617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | /* |
| 619 | * Promotion? |
| 620 | * ---------- |
| 621 | * Track the number of longs (time asleep is greater than threshold) |
| 622 | * and promote when the count threshold is reached. Note that bus |
| 623 | * mastering activity may prevent promotions. |
| 624 | * Do not promote above max_cstate. |
| 625 | */ |
| 626 | if (cx->promotion.state && |
| 627 | ((cx->promotion.state - pr->power.states) <= max_cstate)) { |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 628 | if (sleep_ticks > cx->promotion.threshold.ticks && |
| 629 | cx->promotion.state->latency <= system_latency_constraint()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | cx->promotion.count++; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 631 | cx->demotion.count = 0; |
| 632 | if (cx->promotion.count >= |
| 633 | cx->promotion.threshold.count) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | if (pr->flags.bm_check) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 635 | if (! |
| 636 | (pr->power.bm_activity & cx-> |
| 637 | promotion.threshold.bm)) { |
| 638 | next_state = |
| 639 | cx->promotion.state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | goto end; |
| 641 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 642 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | next_state = cx->promotion.state; |
| 644 | goto end; |
| 645 | } |
| 646 | } |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | /* |
| 651 | * Demotion? |
| 652 | * --------- |
| 653 | * Track the number of shorts (time asleep is less than time threshold) |
| 654 | * and demote when the usage threshold is reached. |
| 655 | */ |
| 656 | if (cx->demotion.state) { |
| 657 | if (sleep_ticks < cx->demotion.threshold.ticks) { |
| 658 | cx->demotion.count++; |
| 659 | cx->promotion.count = 0; |
| 660 | if (cx->demotion.count >= cx->demotion.threshold.count) { |
| 661 | next_state = cx->demotion.state; |
| 662 | goto end; |
| 663 | } |
| 664 | } |
| 665 | } |
| 666 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 667 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | /* |
| 669 | * Demote if current state exceeds max_cstate |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 670 | * or if the latency of the current state is unacceptable |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | */ |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 672 | if ((pr->power.state - pr->power.states) > max_cstate || |
| 673 | pr->power.state->latency > system_latency_constraint()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | if (cx->demotion.state) |
| 675 | next_state = cx->demotion.state; |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * New Cx State? |
| 680 | * ------------- |
| 681 | * If we're going to start using a new Cx state we must clean up |
| 682 | * from the previous and prepare to use the new. |
| 683 | */ |
| 684 | if (next_state != pr->power.state) |
| 685 | acpi_processor_power_activate(pr, next_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | } |
| 687 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 688 | static int acpi_processor_set_power_policy(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | { |
| 690 | unsigned int i; |
| 691 | unsigned int state_is_set = 0; |
| 692 | struct acpi_processor_cx *lower = NULL; |
| 693 | struct acpi_processor_cx *higher = NULL; |
| 694 | struct acpi_processor_cx *cx; |
| 695 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
| 697 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 698 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
| 700 | /* |
| 701 | * This function sets the default Cx state policy (OS idle handler). |
| 702 | * Our scheme is to promote quickly to C2 but more conservatively |
| 703 | * to C3. We're favoring C2 for its characteristics of low latency |
| 704 | * (quick response), good power savings, and ability to allow bus |
| 705 | * mastering activity. Note that the Cx state policy is completely |
| 706 | * customizable and can be altered dynamically. |
| 707 | */ |
| 708 | |
| 709 | /* startup state */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 710 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | cx = &pr->power.states[i]; |
| 712 | if (!cx->valid) |
| 713 | continue; |
| 714 | |
| 715 | if (!state_is_set) |
| 716 | pr->power.state = cx; |
| 717 | state_is_set++; |
| 718 | break; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 719 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | |
| 721 | if (!state_is_set) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 722 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | /* demotion */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 725 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | cx = &pr->power.states[i]; |
| 727 | if (!cx->valid) |
| 728 | continue; |
| 729 | |
| 730 | if (lower) { |
| 731 | cx->demotion.state = lower; |
| 732 | cx->demotion.threshold.ticks = cx->latency_ticks; |
| 733 | cx->demotion.threshold.count = 1; |
| 734 | if (cx->type == ACPI_STATE_C3) |
| 735 | cx->demotion.threshold.bm = bm_history; |
| 736 | } |
| 737 | |
| 738 | lower = cx; |
| 739 | } |
| 740 | |
| 741 | /* promotion */ |
| 742 | for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) { |
| 743 | cx = &pr->power.states[i]; |
| 744 | if (!cx->valid) |
| 745 | continue; |
| 746 | |
| 747 | if (higher) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 748 | cx->promotion.state = higher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | cx->promotion.threshold.ticks = cx->latency_ticks; |
| 750 | if (cx->type >= ACPI_STATE_C2) |
| 751 | cx->promotion.threshold.count = 4; |
| 752 | else |
| 753 | cx->promotion.threshold.count = 10; |
| 754 | if (higher->type == ACPI_STATE_C3) |
| 755 | cx->promotion.threshold.bm = bm_history; |
| 756 | } |
| 757 | |
| 758 | higher = cx; |
| 759 | } |
| 760 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 761 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 763 | #endif /* !CONFIG_CPU_IDLE */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 765 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | |
| 768 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 769 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
| 771 | if (!pr->pblk) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 772 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | /* if info is obtained from pblk/fadt, type equals state */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
| 776 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; |
| 777 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 778 | #ifndef CONFIG_HOTPLUG_CPU |
| 779 | /* |
| 780 | * Check for P_LVL2_UP flag before entering C2 and above on |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 781 | * an SMP system. |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 782 | */ |
Alexey Starikovskiy | ad71860a | 2007-02-02 19:48:19 +0300 | [diff] [blame] | 783 | if ((num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 784 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 785 | return -ENODEV; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 786 | #endif |
| 787 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | /* determine C2 and C3 address from pblk */ |
| 789 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; |
| 790 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; |
| 791 | |
| 792 | /* determine latencies from FADT */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 793 | pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency; |
| 794 | pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | |
| 796 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 797 | "lvl2[0x%08x] lvl3[0x%08x]\n", |
| 798 | pr->power.states[ACPI_STATE_C2].address, |
| 799 | pr->power.states[ACPI_STATE_C3].address)); |
| 800 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 801 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | } |
| 803 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 804 | static int acpi_processor_get_power_info_default(struct acpi_processor *pr) |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 805 | { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 806 | if (!pr->power.states[ACPI_STATE_C1].valid) { |
| 807 | /* set the first C-State to C1 */ |
| 808 | /* all processors need to support C1 */ |
| 809 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; |
| 810 | pr->power.states[ACPI_STATE_C1].valid = 1; |
| 811 | } |
| 812 | /* the C0 state only exists as a filler in our array */ |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 813 | pr->power.states[ACPI_STATE_C0].valid = 1; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 814 | return 0; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 815 | } |
| 816 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 817 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 819 | acpi_status status = 0; |
| 820 | acpi_integer count; |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 821 | int current_count; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 822 | int i; |
| 823 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 824 | union acpi_object *cst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | if (nocst) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 828 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 830 | current_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
| 832 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); |
| 833 | if (ACPI_FAILURE(status)) { |
| 834 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 835 | return -ENODEV; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 836 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 838 | cst = buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | |
| 840 | /* There must be at least 2 elements */ |
| 841 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 842 | printk(KERN_ERR PREFIX "not enough elements in _CST\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | status = -EFAULT; |
| 844 | goto end; |
| 845 | } |
| 846 | |
| 847 | count = cst->package.elements[0].integer.value; |
| 848 | |
| 849 | /* Validate number of power states. */ |
| 850 | if (count < 1 || count != cst->package.count - 1) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 851 | printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | status = -EFAULT; |
| 853 | goto end; |
| 854 | } |
| 855 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | /* Tell driver that at least _CST is supported. */ |
| 857 | pr->flags.has_cst = 1; |
| 858 | |
| 859 | for (i = 1; i <= count; i++) { |
| 860 | union acpi_object *element; |
| 861 | union acpi_object *obj; |
| 862 | struct acpi_power_register *reg; |
| 863 | struct acpi_processor_cx cx; |
| 864 | |
| 865 | memset(&cx, 0, sizeof(cx)); |
| 866 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 867 | element = &(cst->package.elements[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | if (element->type != ACPI_TYPE_PACKAGE) |
| 869 | continue; |
| 870 | |
| 871 | if (element->package.count != 4) |
| 872 | continue; |
| 873 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 874 | obj = &(element->package.elements[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
| 876 | if (obj->type != ACPI_TYPE_BUFFER) |
| 877 | continue; |
| 878 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 879 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
| 881 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 882 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | continue; |
| 884 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | /* There should be an easy way to extract an integer... */ |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 886 | obj = &(element->package.elements[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | if (obj->type != ACPI_TYPE_INTEGER) |
| 888 | continue; |
| 889 | |
| 890 | cx.type = obj->integer.value; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 891 | /* |
| 892 | * Some buggy BIOSes won't list C1 in _CST - |
| 893 | * Let acpi_processor_get_power_info_default() handle them later |
| 894 | */ |
| 895 | if (i == 1 && cx.type != ACPI_STATE_C1) |
| 896 | current_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 898 | cx.address = reg->address; |
| 899 | cx.index = current_count + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 901 | cx.space_id = ACPI_CSTATE_SYSTEMIO; |
| 902 | if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { |
| 903 | if (acpi_processor_ffh_cstate_probe |
| 904 | (pr->id, &cx, reg) == 0) { |
| 905 | cx.space_id = ACPI_CSTATE_FFH; |
| 906 | } else if (cx.type != ACPI_STATE_C1) { |
| 907 | /* |
| 908 | * C1 is a special case where FIXED_HARDWARE |
| 909 | * can be handled in non-MWAIT way as well. |
| 910 | * In that case, save this _CST entry info. |
| 911 | * That is, we retain space_id of SYSTEM_IO for |
| 912 | * halt based C1. |
| 913 | * Otherwise, ignore this info and continue. |
| 914 | */ |
| 915 | continue; |
| 916 | } |
| 917 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 919 | obj = &(element->package.elements[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | if (obj->type != ACPI_TYPE_INTEGER) |
| 921 | continue; |
| 922 | |
| 923 | cx.latency = obj->integer.value; |
| 924 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 925 | obj = &(element->package.elements[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | if (obj->type != ACPI_TYPE_INTEGER) |
| 927 | continue; |
| 928 | |
| 929 | cx.power = obj->integer.value; |
| 930 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 931 | current_count++; |
| 932 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); |
| 933 | |
| 934 | /* |
| 935 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 |
| 936 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) |
| 937 | */ |
| 938 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { |
| 939 | printk(KERN_WARNING |
| 940 | "Limiting number of power states to max (%d)\n", |
| 941 | ACPI_PROCESSOR_MAX_POWER); |
| 942 | printk(KERN_WARNING |
| 943 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); |
| 944 | break; |
| 945 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
| 947 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 948 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 949 | current_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | |
| 951 | /* Validate number of power states discovered */ |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 952 | if (current_count < 2) |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 953 | status = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 955 | end: |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 956 | kfree(buffer.pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 958 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | } |
| 960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) |
| 962 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
| 964 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 965 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
| 967 | /* |
| 968 | * C2 latency must be less than or equal to 100 |
| 969 | * microseconds. |
| 970 | */ |
| 971 | else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { |
| 972 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 973 | "latency too large [%d]\n", cx->latency)); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 974 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | } |
| 976 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | /* |
| 978 | * Otherwise we've met all of our C2 requirements. |
| 979 | * Normalize the C2 latency to expidite policy |
| 980 | */ |
| 981 | cx->valid = 1; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 982 | |
| 983 | #ifndef CONFIG_CPU_IDLE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 985 | #else |
| 986 | cx->latency_ticks = cx->latency; |
| 987 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 989 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | } |
| 991 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 992 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
| 993 | struct acpi_processor_cx *cx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 995 | static int bm_check_flag; |
| 996 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
| 998 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 999 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | |
| 1001 | /* |
| 1002 | * C3 latency must be less than or equal to 1000 |
| 1003 | * microseconds. |
| 1004 | */ |
| 1005 | else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { |
| 1006 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1007 | "latency too large [%d]\n", cx->latency)); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1008 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | } |
| 1010 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | /* |
| 1012 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) |
| 1013 | * DMA transfers are used by any ISA device to avoid livelock. |
| 1014 | * Note that we could disable Type-F DMA (as recommended by |
| 1015 | * the erratum), but this is known to disrupt certain ISA |
| 1016 | * devices thus we take the conservative approach. |
| 1017 | */ |
| 1018 | else if (errata.piix4.fdma) { |
| 1019 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1020 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1021 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | } |
| 1023 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1024 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
| 1025 | if (!bm_check_flag) { |
| 1026 | /* Determine whether bm_check is needed based on CPU */ |
| 1027 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); |
| 1028 | bm_check_flag = pr->flags.bm_check; |
| 1029 | } else { |
| 1030 | pr->flags.bm_check = bm_check_flag; |
| 1031 | } |
| 1032 | |
| 1033 | if (pr->flags.bm_check) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1034 | if (!pr->flags.bm_control) { |
Venki Pallipadi | ed3110e | 2007-07-31 12:04:31 -0700 | [diff] [blame] | 1035 | if (pr->flags.has_cst != 1) { |
| 1036 | /* bus mastering control is necessary */ |
| 1037 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 1038 | "C3 support requires BM control\n")); |
| 1039 | return; |
| 1040 | } else { |
| 1041 | /* Here we enter C3 without bus mastering */ |
| 1042 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 1043 | "C3 support without BM control\n")); |
| 1044 | } |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1045 | } |
| 1046 | } else { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1047 | /* |
| 1048 | * WBINVD should be set in fadt, for C3 state to be |
| 1049 | * supported on when bm_check is not required. |
| 1050 | */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1051 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1052 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1053 | "Cache invalidation should work properly" |
| 1054 | " for C3 to be enabled on SMP systems\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1055 | return; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1056 | } |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 1057 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1058 | } |
| 1059 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | /* |
| 1061 | * Otherwise we've met all of our C3 requirements. |
| 1062 | * Normalize the C3 latency to expidite policy. Enable |
| 1063 | * checking of bus mastering status (bm_check) so we can |
| 1064 | * use this in our C3 policy |
| 1065 | */ |
| 1066 | cx->valid = 1; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1067 | |
| 1068 | #ifndef CONFIG_CPU_IDLE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1070 | #else |
| 1071 | cx->latency_ticks = cx->latency; |
| 1072 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1074 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | } |
| 1076 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
| 1078 | { |
| 1079 | unsigned int i; |
| 1080 | unsigned int working = 0; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 1081 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1082 | pr->power.timer_broadcast_on_state = INT_MAX; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 1083 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1084 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
| 1086 | |
| 1087 | switch (cx->type) { |
| 1088 | case ACPI_STATE_C1: |
| 1089 | cx->valid = 1; |
| 1090 | break; |
| 1091 | |
| 1092 | case ACPI_STATE_C2: |
| 1093 | acpi_processor_power_verify_c2(cx); |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 1094 | if (cx->valid) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1095 | acpi_timer_check_state(i, pr, cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | break; |
| 1097 | |
| 1098 | case ACPI_STATE_C3: |
| 1099 | acpi_processor_power_verify_c3(pr, cx); |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 1100 | if (cx->valid) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1101 | acpi_timer_check_state(i, pr, cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | break; |
| 1103 | } |
| 1104 | |
| 1105 | if (cx->valid) |
| 1106 | working++; |
| 1107 | } |
| 1108 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1109 | acpi_propagate_timer_broadcast(pr); |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 1110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | return (working); |
| 1112 | } |
| 1113 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1114 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | { |
| 1116 | unsigned int i; |
| 1117 | int result; |
| 1118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | |
| 1120 | /* NOTE: the idle thread may not be running while calling |
| 1121 | * this function */ |
| 1122 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 1123 | /* Zero initialize all the C-states info. */ |
| 1124 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
| 1125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | result = acpi_processor_get_power_info_cst(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 1127 | if (result == -ENODEV) |
Darrick J. Wong | c5a114f | 2006-10-19 23:28:28 -0700 | [diff] [blame] | 1128 | result = acpi_processor_get_power_info_fadt(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 1129 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 1130 | if (result) |
| 1131 | return result; |
| 1132 | |
| 1133 | acpi_processor_get_power_info_default(pr); |
| 1134 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 1135 | pr->power.count = acpi_processor_power_verify(pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1137 | #ifndef CONFIG_CPU_IDLE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | /* |
| 1139 | * Set Default Policy |
| 1140 | * ------------------ |
| 1141 | * Now that we know which states are supported, set the default |
| 1142 | * policy. Note that this policy can be changed dynamically |
| 1143 | * (e.g. encourage deeper sleeps to conserve battery life when |
| 1144 | * not on AC). |
| 1145 | */ |
| 1146 | result = acpi_processor_set_power_policy(pr); |
| 1147 | if (result) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1148 | return result; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1149 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | |
| 1151 | /* |
| 1152 | * if one state of type C2 or C3 is available, mark this |
| 1153 | * CPU as being "idle manageable" |
| 1154 | */ |
| 1155 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 1156 | if (pr->power.states[i].valid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | pr->power.count = i; |
Linus Torvalds | 2203d6e | 2005-11-18 07:29:51 -0800 | [diff] [blame] | 1158 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
| 1159 | pr->flags.power = 1; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 1160 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | } |
| 1162 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1163 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | } |
| 1165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) |
| 1167 | { |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 1168 | struct acpi_processor *pr = seq->private; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1169 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | |
| 1172 | if (!pr) |
| 1173 | goto end; |
| 1174 | |
| 1175 | seq_printf(seq, "active state: C%zd\n" |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1176 | "max_cstate: C%d\n" |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1177 | "bus master activity: %08x\n" |
| 1178 | "maximum allowed latency: %d usec\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1179 | pr->power.state ? pr->power.state - pr->power.states : 0, |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1180 | max_cstate, (unsigned)pr->power.bm_activity, |
| 1181 | system_latency_constraint()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | |
| 1183 | seq_puts(seq, "states:\n"); |
| 1184 | |
| 1185 | for (i = 1; i <= pr->power.count; i++) { |
| 1186 | seq_printf(seq, " %cC%d: ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1187 | (&pr->power.states[i] == |
| 1188 | pr->power.state ? '*' : ' '), i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | |
| 1190 | if (!pr->power.states[i].valid) { |
| 1191 | seq_puts(seq, "<not supported>\n"); |
| 1192 | continue; |
| 1193 | } |
| 1194 | |
| 1195 | switch (pr->power.states[i].type) { |
| 1196 | case ACPI_STATE_C1: |
| 1197 | seq_printf(seq, "type[C1] "); |
| 1198 | break; |
| 1199 | case ACPI_STATE_C2: |
| 1200 | seq_printf(seq, "type[C2] "); |
| 1201 | break; |
| 1202 | case ACPI_STATE_C3: |
| 1203 | seq_printf(seq, "type[C3] "); |
| 1204 | break; |
| 1205 | default: |
| 1206 | seq_printf(seq, "type[--] "); |
| 1207 | break; |
| 1208 | } |
| 1209 | |
| 1210 | if (pr->power.states[i].promotion.state) |
| 1211 | seq_printf(seq, "promotion[C%zd] ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1212 | (pr->power.states[i].promotion.state - |
| 1213 | pr->power.states)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | else |
| 1215 | seq_puts(seq, "promotion[--] "); |
| 1216 | |
| 1217 | if (pr->power.states[i].demotion.state) |
| 1218 | seq_printf(seq, "demotion[C%zd] ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1219 | (pr->power.states[i].demotion.state - |
| 1220 | pr->power.states)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | else |
| 1222 | seq_puts(seq, "demotion[--] "); |
| 1223 | |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 1224 | seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1225 | pr->power.states[i].latency, |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 1226 | pr->power.states[i].usage, |
Alexey Starikovskiy | b0b7eaa | 2007-01-25 22:39:44 -0500 | [diff] [blame] | 1227 | (unsigned long long)pr->power.states[i].time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | } |
| 1229 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1230 | end: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1231 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | } |
| 1233 | |
| 1234 | static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) |
| 1235 | { |
| 1236 | return single_open(file, acpi_processor_power_seq_show, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1237 | PDE(inode)->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | } |
| 1239 | |
Arjan van de Ven | d750803 | 2006-07-04 13:06:00 -0400 | [diff] [blame] | 1240 | static const struct file_operations acpi_processor_power_fops = { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1241 | .open = acpi_processor_power_open_fs, |
| 1242 | .read = seq_read, |
| 1243 | .llseek = seq_lseek, |
| 1244 | .release = single_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | }; |
| 1246 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1247 | #ifndef CONFIG_CPU_IDLE |
| 1248 | |
| 1249 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
| 1250 | { |
| 1251 | int result = 0; |
| 1252 | |
| 1253 | |
| 1254 | if (!pr) |
| 1255 | return -EINVAL; |
| 1256 | |
| 1257 | if (nocst) { |
| 1258 | return -ENODEV; |
| 1259 | } |
| 1260 | |
| 1261 | if (!pr->flags.power_setup_done) |
| 1262 | return -ENODEV; |
| 1263 | |
| 1264 | /* Fall back to the default idle loop */ |
| 1265 | pm_idle = pm_idle_save; |
| 1266 | synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ |
| 1267 | |
| 1268 | pr->flags.power = 0; |
| 1269 | result = acpi_processor_get_power_info(pr); |
| 1270 | if ((pr->flags.power == 1) && (pr->flags.power_setup_done)) |
| 1271 | pm_idle = acpi_processor_idle; |
| 1272 | |
| 1273 | return result; |
| 1274 | } |
| 1275 | |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1276 | #ifdef CONFIG_SMP |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1277 | static void smp_callback(void *v) |
| 1278 | { |
| 1279 | /* we already woke the CPU up, nothing more to do */ |
| 1280 | } |
| 1281 | |
| 1282 | /* |
| 1283 | * This function gets called when a part of the kernel has a new latency |
| 1284 | * requirement. This means we need to get all processors out of their C-state, |
| 1285 | * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that |
| 1286 | * wakes them all right up. |
| 1287 | */ |
| 1288 | static int acpi_processor_latency_notify(struct notifier_block *b, |
| 1289 | unsigned long l, void *v) |
| 1290 | { |
| 1291 | smp_call_function(smp_callback, NULL, 0, 1); |
| 1292 | return NOTIFY_OK; |
| 1293 | } |
| 1294 | |
| 1295 | static struct notifier_block acpi_processor_latency_notifier = { |
| 1296 | .notifier_call = acpi_processor_latency_notify, |
| 1297 | }; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1298 | |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1299 | #endif |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1300 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1301 | #else /* CONFIG_CPU_IDLE */ |
| 1302 | |
| 1303 | /** |
| 1304 | * acpi_idle_bm_check - checks if bus master activity was detected |
| 1305 | */ |
| 1306 | static int acpi_idle_bm_check(void) |
| 1307 | { |
| 1308 | u32 bm_status = 0; |
| 1309 | |
| 1310 | acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); |
| 1311 | if (bm_status) |
| 1312 | acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); |
| 1313 | /* |
| 1314 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect |
| 1315 | * the true state of bus mastering activity; forcing us to |
| 1316 | * manually check the BMIDEA bit of each IDE channel. |
| 1317 | */ |
| 1318 | else if (errata.piix4.bmisx) { |
| 1319 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) |
| 1320 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
| 1321 | bm_status = 1; |
| 1322 | } |
| 1323 | return bm_status; |
| 1324 | } |
| 1325 | |
| 1326 | /** |
| 1327 | * acpi_idle_update_bm_rld - updates the BM_RLD bit depending on target state |
| 1328 | * @pr: the processor |
| 1329 | * @target: the new target state |
| 1330 | */ |
| 1331 | static inline void acpi_idle_update_bm_rld(struct acpi_processor *pr, |
| 1332 | struct acpi_processor_cx *target) |
| 1333 | { |
| 1334 | if (pr->flags.bm_rld_set && target->type != ACPI_STATE_C3) { |
| 1335 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); |
| 1336 | pr->flags.bm_rld_set = 0; |
| 1337 | } |
| 1338 | |
| 1339 | if (!pr->flags.bm_rld_set && target->type == ACPI_STATE_C3) { |
| 1340 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1); |
| 1341 | pr->flags.bm_rld_set = 1; |
| 1342 | } |
| 1343 | } |
| 1344 | |
| 1345 | /** |
| 1346 | * acpi_idle_do_entry - a helper function that does C2 and C3 type entry |
| 1347 | * @cx: cstate data |
| 1348 | */ |
| 1349 | static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) |
| 1350 | { |
| 1351 | if (cx->space_id == ACPI_CSTATE_FFH) { |
| 1352 | /* Call into architectural FFH based C-state */ |
| 1353 | acpi_processor_ffh_cstate_enter(cx); |
| 1354 | } else { |
| 1355 | int unused; |
| 1356 | /* IO port based C-state */ |
| 1357 | inb(cx->address); |
| 1358 | /* Dummy wait op - must do something useless after P_LVL2 read |
| 1359 | because chipsets cannot guarantee that STPCLK# signal |
| 1360 | gets asserted in time to freeze execution properly. */ |
| 1361 | unused = inl(acpi_gbl_FADT.xpm_timer_block.address); |
| 1362 | } |
| 1363 | } |
| 1364 | |
| 1365 | /** |
| 1366 | * acpi_idle_enter_c1 - enters an ACPI C1 state-type |
| 1367 | * @dev: the target CPU |
| 1368 | * @state: the state data |
| 1369 | * |
| 1370 | * This is equivalent to the HALT instruction. |
| 1371 | */ |
| 1372 | static int acpi_idle_enter_c1(struct cpuidle_device *dev, |
| 1373 | struct cpuidle_state *state) |
| 1374 | { |
| 1375 | struct acpi_processor *pr; |
| 1376 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
| 1377 | pr = processors[smp_processor_id()]; |
| 1378 | |
| 1379 | if (unlikely(!pr)) |
| 1380 | return 0; |
| 1381 | |
| 1382 | if (pr->flags.bm_check) |
| 1383 | acpi_idle_update_bm_rld(pr, cx); |
| 1384 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1385 | acpi_safe_halt(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1386 | |
| 1387 | cx->usage++; |
| 1388 | |
| 1389 | return 0; |
| 1390 | } |
| 1391 | |
| 1392 | /** |
| 1393 | * acpi_idle_enter_simple - enters an ACPI state without BM handling |
| 1394 | * @dev: the target CPU |
| 1395 | * @state: the state data |
| 1396 | */ |
| 1397 | static int acpi_idle_enter_simple(struct cpuidle_device *dev, |
| 1398 | struct cpuidle_state *state) |
| 1399 | { |
| 1400 | struct acpi_processor *pr; |
| 1401 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
| 1402 | u32 t1, t2; |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 1403 | int sleep_ticks = 0; |
| 1404 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1405 | pr = processors[smp_processor_id()]; |
| 1406 | |
| 1407 | if (unlikely(!pr)) |
| 1408 | return 0; |
| 1409 | |
Len Brown | e196441 | 2007-10-04 01:23:47 -0400 | [diff] [blame] | 1410 | if (acpi_idle_suspend) |
| 1411 | return(acpi_idle_enter_c1(dev, state)); |
| 1412 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1413 | local_irq_disable(); |
| 1414 | current_thread_info()->status &= ~TS_POLLING; |
| 1415 | /* |
| 1416 | * TS_POLLING-cleared state must be visible before we test |
| 1417 | * NEED_RESCHED: |
| 1418 | */ |
| 1419 | smp_mb(); |
| 1420 | |
| 1421 | if (unlikely(need_resched())) { |
| 1422 | current_thread_info()->status |= TS_POLLING; |
| 1423 | local_irq_enable(); |
| 1424 | return 0; |
| 1425 | } |
| 1426 | |
Venki Pallipadi | bde6f5f | 2008-01-30 13:32:01 +0100 | [diff] [blame^] | 1427 | acpi_unlazy_tlb(smp_processor_id()); |
Thomas Gleixner | e17bcb4 | 2007-12-07 19:16:17 +0100 | [diff] [blame] | 1428 | /* |
| 1429 | * Must be done before busmaster disable as we might need to |
| 1430 | * access HPET ! |
| 1431 | */ |
| 1432 | acpi_state_timer_broadcast(pr, cx, 1); |
| 1433 | |
| 1434 | if (pr->flags.bm_check) |
| 1435 | acpi_idle_update_bm_rld(pr, cx); |
| 1436 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1437 | if (cx->type == ACPI_STATE_C3) |
| 1438 | ACPI_FLUSH_CPU_CACHE(); |
| 1439 | |
| 1440 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 1441 | /* Tell the scheduler that we are going deep-idle: */ |
| 1442 | sched_clock_idle_sleep_event(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1443 | acpi_idle_do_entry(cx); |
| 1444 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
| 1445 | |
| 1446 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC) |
| 1447 | /* TSC could halt in idle, so notify users */ |
| 1448 | mark_tsc_unstable("TSC halts in idle");; |
| 1449 | #endif |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 1450 | sleep_ticks = ticks_elapsed(t1, t2); |
| 1451 | |
| 1452 | /* Tell the scheduler how much we idled: */ |
| 1453 | sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1454 | |
| 1455 | local_irq_enable(); |
| 1456 | current_thread_info()->status |= TS_POLLING; |
| 1457 | |
| 1458 | cx->usage++; |
| 1459 | |
| 1460 | acpi_state_timer_broadcast(pr, cx, 0); |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 1461 | cx->time += sleep_ticks; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1462 | return ticks_elapsed_in_us(t1, t2); |
| 1463 | } |
| 1464 | |
| 1465 | static int c3_cpu_count; |
| 1466 | static DEFINE_SPINLOCK(c3_lock); |
| 1467 | |
| 1468 | /** |
| 1469 | * acpi_idle_enter_bm - enters C3 with proper BM handling |
| 1470 | * @dev: the target CPU |
| 1471 | * @state: the state data |
| 1472 | * |
| 1473 | * If BM is detected, the deepest non-C3 idle state is entered instead. |
| 1474 | */ |
| 1475 | static int acpi_idle_enter_bm(struct cpuidle_device *dev, |
| 1476 | struct cpuidle_state *state) |
| 1477 | { |
| 1478 | struct acpi_processor *pr; |
| 1479 | struct acpi_processor_cx *cx = cpuidle_get_statedata(state); |
| 1480 | u32 t1, t2; |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 1481 | int sleep_ticks = 0; |
| 1482 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1483 | pr = processors[smp_processor_id()]; |
| 1484 | |
| 1485 | if (unlikely(!pr)) |
| 1486 | return 0; |
| 1487 | |
Len Brown | e196441 | 2007-10-04 01:23:47 -0400 | [diff] [blame] | 1488 | if (acpi_idle_suspend) |
| 1489 | return(acpi_idle_enter_c1(dev, state)); |
| 1490 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1491 | if (acpi_idle_bm_check()) { |
| 1492 | if (dev->safe_state) { |
| 1493 | return dev->safe_state->enter(dev, dev->safe_state); |
| 1494 | } else { |
| 1495 | acpi_safe_halt(); |
| 1496 | return 0; |
| 1497 | } |
| 1498 | } |
| 1499 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1500 | local_irq_disable(); |
| 1501 | current_thread_info()->status &= ~TS_POLLING; |
| 1502 | /* |
| 1503 | * TS_POLLING-cleared state must be visible before we test |
| 1504 | * NEED_RESCHED: |
| 1505 | */ |
| 1506 | smp_mb(); |
| 1507 | |
| 1508 | if (unlikely(need_resched())) { |
| 1509 | current_thread_info()->status |= TS_POLLING; |
| 1510 | local_irq_enable(); |
| 1511 | return 0; |
| 1512 | } |
| 1513 | |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 1514 | /* Tell the scheduler that we are going deep-idle: */ |
| 1515 | sched_clock_idle_sleep_event(); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1516 | /* |
| 1517 | * Must be done before busmaster disable as we might need to |
| 1518 | * access HPET ! |
| 1519 | */ |
| 1520 | acpi_state_timer_broadcast(pr, cx, 1); |
| 1521 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1522 | acpi_idle_update_bm_rld(pr, cx); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1523 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1524 | /* |
| 1525 | * disable bus master |
| 1526 | * bm_check implies we need ARB_DIS |
| 1527 | * !bm_check implies we need cache flush |
| 1528 | * bm_control implies whether we can do ARB_DIS |
| 1529 | * |
| 1530 | * That leaves a case where bm_check is set and bm_control is |
| 1531 | * not set. In that case we cannot do much, we enter C3 |
| 1532 | * without doing anything. |
| 1533 | */ |
| 1534 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1535 | spin_lock(&c3_lock); |
| 1536 | c3_cpu_count++; |
| 1537 | /* Disable bus master arbitration when all CPUs are in C3 */ |
| 1538 | if (c3_cpu_count == num_online_cpus()) |
| 1539 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1); |
| 1540 | spin_unlock(&c3_lock); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1541 | } else if (!pr->flags.bm_check) { |
| 1542 | ACPI_FLUSH_CPU_CACHE(); |
| 1543 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1544 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1545 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
| 1546 | acpi_idle_do_entry(cx); |
| 1547 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1548 | |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1549 | /* Re-enable bus master arbitration */ |
| 1550 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1551 | spin_lock(&c3_lock); |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1552 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1553 | c3_cpu_count--; |
| 1554 | spin_unlock(&c3_lock); |
| 1555 | } |
| 1556 | |
| 1557 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC) |
| 1558 | /* TSC could halt in idle, so notify users */ |
| 1559 | mark_tsc_unstable("TSC halts in idle"); |
| 1560 | #endif |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 1561 | sleep_ticks = ticks_elapsed(t1, t2); |
| 1562 | /* Tell the scheduler how much we idled: */ |
| 1563 | sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1564 | |
| 1565 | local_irq_enable(); |
| 1566 | current_thread_info()->status |= TS_POLLING; |
| 1567 | |
| 1568 | cx->usage++; |
| 1569 | |
| 1570 | acpi_state_timer_broadcast(pr, cx, 0); |
Venkatesh Pallipadi | 5062911 | 2007-11-19 19:49:00 -0500 | [diff] [blame] | 1571 | cx->time += sleep_ticks; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1572 | return ticks_elapsed_in_us(t1, t2); |
| 1573 | } |
| 1574 | |
| 1575 | struct cpuidle_driver acpi_idle_driver = { |
| 1576 | .name = "acpi_idle", |
| 1577 | .owner = THIS_MODULE, |
| 1578 | }; |
| 1579 | |
| 1580 | /** |
| 1581 | * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE |
| 1582 | * @pr: the ACPI processor |
| 1583 | */ |
| 1584 | static int acpi_processor_setup_cpuidle(struct acpi_processor *pr) |
| 1585 | { |
| 1586 | int i, count = 0; |
| 1587 | struct acpi_processor_cx *cx; |
| 1588 | struct cpuidle_state *state; |
| 1589 | struct cpuidle_device *dev = &pr->power.dev; |
| 1590 | |
| 1591 | if (!pr->flags.power_setup_done) |
| 1592 | return -EINVAL; |
| 1593 | |
| 1594 | if (pr->flags.power == 0) { |
| 1595 | return -EINVAL; |
| 1596 | } |
| 1597 | |
| 1598 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
| 1599 | cx = &pr->power.states[i]; |
| 1600 | state = &dev->states[count]; |
| 1601 | |
| 1602 | if (!cx->valid) |
| 1603 | continue; |
| 1604 | |
| 1605 | #ifdef CONFIG_HOTPLUG_CPU |
| 1606 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
| 1607 | !pr->flags.has_cst && |
| 1608 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
| 1609 | continue; |
| 1610 | #endif |
| 1611 | cpuidle_set_statedata(state, cx); |
| 1612 | |
| 1613 | snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); |
| 1614 | state->exit_latency = cx->latency; |
| 1615 | state->target_residency = cx->latency * 6; |
| 1616 | state->power_usage = cx->power; |
| 1617 | |
| 1618 | state->flags = 0; |
| 1619 | switch (cx->type) { |
| 1620 | case ACPI_STATE_C1: |
| 1621 | state->flags |= CPUIDLE_FLAG_SHALLOW; |
| 1622 | state->enter = acpi_idle_enter_c1; |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1623 | dev->safe_state = state; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1624 | break; |
| 1625 | |
| 1626 | case ACPI_STATE_C2: |
| 1627 | state->flags |= CPUIDLE_FLAG_BALANCED; |
| 1628 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1629 | state->enter = acpi_idle_enter_simple; |
Venkatesh Pallipadi | ddc081a | 2007-11-19 21:43:22 -0500 | [diff] [blame] | 1630 | dev->safe_state = state; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1631 | break; |
| 1632 | |
| 1633 | case ACPI_STATE_C3: |
| 1634 | state->flags |= CPUIDLE_FLAG_DEEP; |
| 1635 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
| 1636 | state->flags |= CPUIDLE_FLAG_CHECK_BM; |
| 1637 | state->enter = pr->flags.bm_check ? |
| 1638 | acpi_idle_enter_bm : |
| 1639 | acpi_idle_enter_simple; |
| 1640 | break; |
| 1641 | } |
| 1642 | |
| 1643 | count++; |
| 1644 | } |
| 1645 | |
| 1646 | dev->state_count = count; |
| 1647 | |
| 1648 | if (!count) |
| 1649 | return -EINVAL; |
| 1650 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1651 | return 0; |
| 1652 | } |
| 1653 | |
| 1654 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
| 1655 | { |
| 1656 | int ret; |
| 1657 | |
| 1658 | if (!pr) |
| 1659 | return -EINVAL; |
| 1660 | |
| 1661 | if (nocst) { |
| 1662 | return -ENODEV; |
| 1663 | } |
| 1664 | |
| 1665 | if (!pr->flags.power_setup_done) |
| 1666 | return -ENODEV; |
| 1667 | |
| 1668 | cpuidle_pause_and_lock(); |
| 1669 | cpuidle_disable_device(&pr->power.dev); |
| 1670 | acpi_processor_get_power_info(pr); |
| 1671 | acpi_processor_setup_cpuidle(pr); |
| 1672 | ret = cpuidle_enable_device(&pr->power.dev); |
| 1673 | cpuidle_resume_and_unlock(); |
| 1674 | |
| 1675 | return ret; |
| 1676 | } |
| 1677 | |
| 1678 | #endif /* CONFIG_CPU_IDLE */ |
| 1679 | |
Pierre Ossman | 7af8b66 | 2006-10-10 14:20:31 -0700 | [diff] [blame] | 1680 | int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1681 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1683 | acpi_status status = 0; |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 1684 | static int first_run; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1685 | struct proc_dir_entry *entry = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | unsigned int i; |
| 1687 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | |
| 1689 | if (!first_run) { |
| 1690 | dmi_check_system(processor_power_dmi_table); |
Alexey Starikovskiy | c1c3063 | 2007-11-26 20:42:19 +0100 | [diff] [blame] | 1691 | max_cstate = acpi_processor_cstate_check(max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | if (max_cstate < ACPI_C_STATES_MAX) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1693 | printk(KERN_NOTICE |
| 1694 | "ACPI: processor limited to max C-state %d\n", |
| 1695 | max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | first_run++; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1697 | #if !defined (CONFIG_CPU_IDLE) && defined (CONFIG_SMP) |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1698 | register_latency_notifier(&acpi_processor_latency_notifier); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1699 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | } |
| 1701 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1702 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1703 | return -EINVAL; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1704 | |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1705 | if (acpi_gbl_FADT.cst_control && !nocst) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1706 | status = |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1707 | 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] | 1708 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1709 | ACPI_EXCEPTION((AE_INFO, status, |
| 1710 | "Notifying BIOS of _CST ability failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | } |
| 1712 | } |
| 1713 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | acpi_processor_get_power_info(pr); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1715 | pr->flags.power_setup_done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | |
| 1717 | /* |
| 1718 | * Install the idle handler if processor power management is supported. |
| 1719 | * Note that we use previously set idle handler will be used on |
| 1720 | * platforms that only support C1. |
| 1721 | */ |
| 1722 | if ((pr->flags.power) && (!boot_option_idle_override)) { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1723 | #ifdef CONFIG_CPU_IDLE |
| 1724 | acpi_processor_setup_cpuidle(pr); |
| 1725 | pr->power.dev.cpu = pr->id; |
| 1726 | if (cpuidle_register_device(&pr->power.dev)) |
| 1727 | return -EIO; |
| 1728 | #endif |
| 1729 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); |
| 1731 | for (i = 1; i <= pr->power.count; i++) |
| 1732 | if (pr->power.states[i].valid) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1733 | printk(" C%d[C%d]", i, |
| 1734 | pr->power.states[i].type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | printk(")\n"); |
| 1736 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1737 | #ifndef CONFIG_CPU_IDLE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | if (pr->id == 0) { |
| 1739 | pm_idle_save = pm_idle; |
| 1740 | pm_idle = acpi_processor_idle; |
| 1741 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1742 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | } |
| 1744 | |
| 1745 | /* 'power' [R] */ |
| 1746 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1747 | S_IRUGO, acpi_device_dir(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | if (!entry) |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1749 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | else { |
| 1751 | entry->proc_fops = &acpi_processor_power_fops; |
| 1752 | entry->data = acpi_driver_data(device); |
| 1753 | entry->owner = THIS_MODULE; |
| 1754 | } |
| 1755 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1756 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | } |
| 1758 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1759 | int acpi_processor_power_exit(struct acpi_processor *pr, |
| 1760 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | { |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1762 | #ifdef CONFIG_CPU_IDLE |
| 1763 | if ((pr->flags.power) && (!boot_option_idle_override)) |
| 1764 | cpuidle_unregister_device(&pr->power.dev); |
| 1765 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | pr->flags.power_setup_done = 0; |
| 1767 | |
| 1768 | if (acpi_device_dir(device)) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1769 | remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
| 1770 | acpi_device_dir(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1772 | #ifndef CONFIG_CPU_IDLE |
| 1773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | /* Unregister the idle handler when processor #0 is removed. */ |
| 1775 | if (pr->id == 0) { |
| 1776 | pm_idle = pm_idle_save; |
| 1777 | |
| 1778 | /* |
| 1779 | * We are about to unload the current idle thread pm callback |
| 1780 | * (pm_idle), Wait for all processors to update cached/local |
| 1781 | * copies of pm_idle before proceeding. |
| 1782 | */ |
| 1783 | cpu_idle_wait(); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1784 | #ifdef CONFIG_SMP |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1785 | unregister_latency_notifier(&acpi_processor_latency_notifier); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1786 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | } |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 1788 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1790 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | } |