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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Thomas Gleixner | 3434933 | 2007-02-16 01:27:54 -0800 | [diff] [blame] | 44 | /* |
| 45 | * Include the apic definitions for x86 to have the APIC timer related defines |
| 46 | * available also for UP (on SMP it gets magically included via linux/smp.h). |
| 47 | * asm/acpi.h is not an option, as it would require more include magic. Also |
| 48 | * creating an empty asm-ia64/apic.h would just trade pest vs. cholera. |
| 49 | */ |
| 50 | #ifdef CONFIG_X86 |
| 51 | #include <asm/apic.h> |
| 52 | #endif |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #include <asm/io.h> |
| 55 | #include <asm/uaccess.h> |
| 56 | |
| 57 | #include <acpi/acpi_bus.h> |
| 58 | #include <acpi/processor.h> |
| 59 | |
| 60 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 |
| 61 | #define ACPI_PROCESSOR_CLASS "processor" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
Len Brown | f52fd66 | 2007-02-12 22:42:12 -0500 | [diff] [blame] | 63 | ACPI_MODULE_NAME("processor_idle"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | #define ACPI_PROCESSOR_FILE_POWER "power" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #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] | 66 | #define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */ |
| 68 | #define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */ |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 69 | static void (*pm_idle_save) (void) __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | module_param(max_cstate, uint, 0644); |
| 71 | |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 72 | static unsigned int nocst __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | module_param(nocst, uint, 0000); |
| 74 | |
| 75 | /* |
| 76 | * bm_history -- bit-mask with a bit per jiffy of bus-master activity |
| 77 | * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms |
| 78 | * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms |
| 79 | * 100 HZ: 0x0000000F: 4 jiffies = 40ms |
| 80 | * reduce history for more aggressive entry into C3 |
| 81 | */ |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 82 | static unsigned int bm_history __read_mostly = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 83 | (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | module_param(bm_history, uint, 0644); |
| 85 | /* -------------------------------------------------------------------------- |
| 86 | Power Management |
| 87 | -------------------------------------------------------------------------- */ |
| 88 | |
| 89 | /* |
| 90 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. |
| 91 | * For now disable this. Probably a bug somewhere else. |
| 92 | * |
| 93 | * To skip this limit, boot/load with a large max_cstate limit. |
| 94 | */ |
David Shaohua Li | 335f16b | 2005-06-22 18:37:00 -0400 | [diff] [blame] | 95 | static int set_max_cstate(struct dmi_system_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
| 97 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) |
| 98 | return 0; |
| 99 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 100 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 101 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
| 102 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 104 | max_cstate = (long)id->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
Ashok Raj | 7ded568 | 2006-02-03 21:51:23 +0100 | [diff] [blame] | 109 | /* Actually this shouldn't be __cpuinitdata, would be better to fix the |
| 110 | callers to only run once -AK */ |
| 111 | static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 112 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 113 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
Bartlomiej Swiercz | f831335 | 2006-05-29 07:16:00 -0400 | [diff] [blame] | 114 | DMI_MATCH(DMI_BIOS_VERSION,"1SET70WW")}, (void *)1}, |
| 115 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 116 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 117 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1}, |
| 118 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 119 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 120 | DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1}, |
| 121 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 122 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 123 | DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1}, |
| 124 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 125 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 126 | DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1}, |
| 127 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 128 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 129 | DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1}, |
| 130 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 131 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 132 | DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1}, |
| 133 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 134 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 135 | DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1}, |
| 136 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 137 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 138 | DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1}, |
| 139 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 140 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 141 | DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1}, |
| 142 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 143 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 144 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1}, |
| 145 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 146 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 147 | DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1}, |
| 148 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 149 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 150 | DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1}, |
| 151 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 152 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 153 | DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1}, |
| 154 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 155 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 156 | DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1}, |
| 157 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 158 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 159 | DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1}, |
| 160 | { set_max_cstate, "Medion 41700", { |
| 161 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 162 | DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1}, |
| 163 | { set_max_cstate, "Clevo 5600D", { |
| 164 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 165 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 166 | (void *)2}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | {}, |
| 168 | }; |
| 169 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 170 | static inline u32 ticks_elapsed(u32 t1, u32 t2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | { |
| 172 | if (t2 >= t1) |
| 173 | return (t2 - t1); |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 174 | else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); |
| 176 | else |
| 177 | return ((0xFFFFFFFF - t1) + t2); |
| 178 | } |
| 179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | static void |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 181 | acpi_processor_power_activate(struct acpi_processor *pr, |
| 182 | struct acpi_processor_cx *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 184 | struct acpi_processor_cx *old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
| 186 | if (!pr || !new) |
| 187 | return; |
| 188 | |
| 189 | old = pr->power.state; |
| 190 | |
| 191 | if (old) |
| 192 | old->promotion.count = 0; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 193 | new->demotion.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
| 195 | /* Cleanup from old state. */ |
| 196 | if (old) { |
| 197 | switch (old->type) { |
| 198 | case ACPI_STATE_C3: |
| 199 | /* Disable bus master reload */ |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 200 | if (new->type != ACPI_STATE_C3 && pr->flags.bm_check) |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 201 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | break; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | /* Prepare to use new state. */ |
| 207 | switch (new->type) { |
| 208 | case ACPI_STATE_C3: |
| 209 | /* Enable bus master reload */ |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 210 | if (old->type != ACPI_STATE_C3 && pr->flags.bm_check) |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 211 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | break; |
| 213 | } |
| 214 | |
| 215 | pr->power.state = new; |
| 216 | |
| 217 | return; |
| 218 | } |
| 219 | |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 220 | static void acpi_safe_halt(void) |
| 221 | { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 222 | current_thread_info()->status &= ~TS_POLLING; |
Ingo Molnar | 0888f06 | 2006-12-22 01:11:56 -0800 | [diff] [blame] | 223 | /* |
| 224 | * TS_POLLING-cleared state must be visible before we |
| 225 | * test NEED_RESCHED: |
| 226 | */ |
| 227 | smp_mb(); |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 228 | if (!need_resched()) |
| 229 | safe_halt(); |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 230 | current_thread_info()->status |= TS_POLLING; |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 231 | } |
| 232 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 233 | static atomic_t c3_cpu_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 235 | /* Common C-state entry for C2, C3, .. */ |
| 236 | static void acpi_cstate_enter(struct acpi_processor_cx *cstate) |
| 237 | { |
| 238 | if (cstate->space_id == ACPI_CSTATE_FFH) { |
| 239 | /* Call into architectural FFH based C-state */ |
| 240 | acpi_processor_ffh_cstate_enter(cstate); |
| 241 | } else { |
| 242 | int unused; |
| 243 | /* IO port based C-state */ |
| 244 | inb(cstate->address); |
| 245 | /* Dummy wait op - must do something useless after P_LVL2 read |
| 246 | because chipsets cannot guarantee that STPCLK# signal |
| 247 | gets asserted in time to freeze execution properly. */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 248 | unused = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 249 | } |
| 250 | } |
| 251 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 252 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
| 253 | |
| 254 | /* |
| 255 | * Some BIOS implementations switch to C3 in the published C2 state. |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 256 | * This seems to be a common problem on AMD boxen, but other vendors |
| 257 | * are affected too. We pick the most conservative approach: we assume |
| 258 | * that the local APIC stops in both C2 and C3. |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 259 | */ |
| 260 | static void acpi_timer_check_state(int state, struct acpi_processor *pr, |
| 261 | struct acpi_processor_cx *cx) |
| 262 | { |
| 263 | struct acpi_processor_power *pwr = &pr->power; |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 264 | 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] | 265 | |
| 266 | /* |
| 267 | * Check, if one of the previous states already marked the lapic |
| 268 | * unstable |
| 269 | */ |
| 270 | if (pwr->timer_broadcast_on_state < state) |
| 271 | return; |
| 272 | |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 273 | if (cx->type >= type) |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 274 | pr->power.timer_broadcast_on_state = state; |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 275 | } |
| 276 | |
| 277 | static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) |
| 278 | { |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 279 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
| 280 | unsigned long reason; |
| 281 | |
| 282 | reason = pr->power.timer_broadcast_on_state < INT_MAX ? |
| 283 | CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; |
| 284 | |
| 285 | clockevents_notify(reason, &pr->id); |
| 286 | #else |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 287 | cpumask_t mask = cpumask_of_cpu(pr->id); |
| 288 | |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 289 | if (pr->power.timer_broadcast_on_state < INT_MAX) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 290 | on_each_cpu(switch_APIC_timer_to_ipi, &mask, 1, 1); |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 291 | else |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 292 | on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 293 | #endif |
| 294 | } |
| 295 | |
| 296 | /* Power(C) State timer broadcast control */ |
| 297 | static void acpi_state_timer_broadcast(struct acpi_processor *pr, |
| 298 | struct acpi_processor_cx *cx, |
| 299 | int broadcast) |
| 300 | { |
| 301 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
| 302 | |
| 303 | int state = cx - pr->power.states; |
| 304 | |
| 305 | if (state >= pr->power.timer_broadcast_on_state) { |
| 306 | unsigned long reason; |
| 307 | |
| 308 | reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : |
| 309 | CLOCK_EVT_NOTIFY_BROADCAST_EXIT; |
| 310 | clockevents_notify(reason, &pr->id); |
| 311 | } |
| 312 | #endif |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | #else |
| 316 | |
| 317 | static void acpi_timer_check_state(int state, struct acpi_processor *pr, |
| 318 | struct acpi_processor_cx *cstate) { } |
| 319 | static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) { } |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 320 | static void acpi_state_timer_broadcast(struct acpi_processor *pr, |
| 321 | struct acpi_processor_cx *cx, |
| 322 | int broadcast) |
| 323 | { |
| 324 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 325 | |
| 326 | #endif |
| 327 | |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame^] | 328 | /* |
| 329 | * Suspend / resume control |
| 330 | */ |
| 331 | static int acpi_idle_suspend; |
| 332 | |
| 333 | int acpi_processor_suspend(struct acpi_device * device, pm_message_t state) |
| 334 | { |
| 335 | acpi_idle_suspend = 1; |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | int acpi_processor_resume(struct acpi_device * device) |
| 340 | { |
| 341 | acpi_idle_suspend = 0; |
| 342 | return 0; |
| 343 | } |
| 344 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 345 | static void acpi_processor_idle(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 347 | struct acpi_processor *pr = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | struct acpi_processor_cx *cx = NULL; |
| 349 | struct acpi_processor_cx *next_state = NULL; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 350 | int sleep_ticks = 0; |
| 351 | u32 t1, t2 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | /* |
| 354 | * Interrupts must be disabled during bus mastering calculations and |
| 355 | * for C2/C3 transitions. |
| 356 | */ |
| 357 | local_irq_disable(); |
| 358 | |
Venkatesh Pallipadi | d5a3d32 | 2007-06-15 19:36:00 -0400 | [diff] [blame] | 359 | pr = processors[smp_processor_id()]; |
| 360 | if (!pr) { |
| 361 | local_irq_enable(); |
| 362 | return; |
| 363 | } |
| 364 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | /* |
| 366 | * Check whether we truly need to go idle, or should |
| 367 | * reschedule: |
| 368 | */ |
| 369 | if (unlikely(need_resched())) { |
| 370 | local_irq_enable(); |
| 371 | return; |
| 372 | } |
| 373 | |
| 374 | cx = pr->power.state; |
Thomas Gleixner | b04e7bd | 2007-09-22 22:29:05 +0000 | [diff] [blame^] | 375 | if (!cx || acpi_idle_suspend) { |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 376 | if (pm_idle_save) |
| 377 | pm_idle_save(); |
| 378 | else |
| 379 | acpi_safe_halt(); |
| 380 | return; |
| 381 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
| 383 | /* |
| 384 | * Check BM Activity |
| 385 | * ----------------- |
| 386 | * Check for bus mastering activity (if required), record, and check |
| 387 | * for demotion. |
| 388 | */ |
| 389 | if (pr->flags.bm_check) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 390 | u32 bm_status = 0; |
| 391 | unsigned long diff = jiffies - pr->power.bm_check_timestamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 393 | if (diff > 31) |
| 394 | diff = 31; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 396 | pr->power.bm_activity <<= diff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 398 | acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | if (bm_status) { |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 400 | pr->power.bm_activity |= 0x1; |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 401 | acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | } |
| 403 | /* |
| 404 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect |
| 405 | * the true state of bus mastering activity; forcing us to |
| 406 | * manually check the BMIDEA bit of each IDE channel. |
| 407 | */ |
| 408 | else if (errata.piix4.bmisx) { |
| 409 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 410 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 411 | pr->power.bm_activity |= 0x1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | pr->power.bm_check_timestamp = jiffies; |
| 415 | |
| 416 | /* |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 417 | * If bus mastering is or was active this jiffy, demote |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | * to avoid a faulty transition. Note that the processor |
| 419 | * won't enter a low-power state during this call (to this |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 420 | * function) but should upon the next. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | * |
| 422 | * TBD: A better policy might be to fallback to the demotion |
| 423 | * state (use it for this quantum only) istead of |
| 424 | * demoting -- and rely on duration as our sole demotion |
| 425 | * qualification. This may, however, introduce DMA |
| 426 | * issues (e.g. floppy DMA transfer overrun/underrun). |
| 427 | */ |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 428 | if ((pr->power.bm_activity & 0x1) && |
| 429 | cx->demotion.threshold.bm) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | local_irq_enable(); |
| 431 | next_state = cx->demotion.state; |
| 432 | goto end; |
| 433 | } |
| 434 | } |
| 435 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 436 | #ifdef CONFIG_HOTPLUG_CPU |
| 437 | /* |
| 438 | * Check for P_LVL2_UP flag before entering C2 and above on |
| 439 | * an SMP system. We do it here instead of doing it at _CST/P_LVL |
| 440 | * detection phase, to work cleanly with logical CPU hotplug. |
| 441 | */ |
| 442 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 443 | !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] | 444 | cx = &pr->power.states[ACPI_STATE_C1]; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 445 | #endif |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | /* |
| 448 | * Sleep: |
| 449 | * ------ |
| 450 | * Invoke the current Cx state to put the processor to sleep. |
| 451 | */ |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 452 | if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 453 | current_thread_info()->status &= ~TS_POLLING; |
Ingo Molnar | 0888f06 | 2006-12-22 01:11:56 -0800 | [diff] [blame] | 454 | /* |
| 455 | * TS_POLLING-cleared state must be visible before we |
| 456 | * test NEED_RESCHED: |
| 457 | */ |
| 458 | smp_mb(); |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 459 | if (need_resched()) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 460 | current_thread_info()->status |= TS_POLLING; |
Linus Torvalds | af2eb17 | 2005-12-02 23:09:06 -0800 | [diff] [blame] | 461 | local_irq_enable(); |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 462 | return; |
| 463 | } |
| 464 | } |
| 465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | switch (cx->type) { |
| 467 | |
| 468 | case ACPI_STATE_C1: |
| 469 | /* |
| 470 | * Invoke C1. |
| 471 | * Use the appropriate idle routine, the one that would |
| 472 | * be used without acpi C-states. |
| 473 | */ |
| 474 | if (pm_idle_save) |
| 475 | pm_idle_save(); |
| 476 | else |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 477 | acpi_safe_halt(); |
| 478 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | /* |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 480 | * TBD: Can't get time duration while in C1, as resumes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | * go to an ISR rather than here. Need to instrument |
| 482 | * base interrupt handler. |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 483 | * |
| 484 | * Note: the TSC better not stop in C1, sched_clock() will |
| 485 | * skew otherwise. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | */ |
| 487 | sleep_ticks = 0xFFFFFFFF; |
| 488 | break; |
| 489 | |
| 490 | case ACPI_STATE_C2: |
| 491 | /* Get start time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 492 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 493 | /* Tell the scheduler that we are going deep-idle: */ |
| 494 | sched_clock_idle_sleep_event(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | /* Invoke C2 */ |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 496 | acpi_state_timer_broadcast(pr, cx, 1); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 497 | acpi_cstate_enter(cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | /* Get end time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 499 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 500 | |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 501 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC) |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 502 | /* TSC halts in C2, so notify users */ |
john stultz | 5a90cf2 | 2007-05-02 19:27:08 +0200 | [diff] [blame] | 503 | mark_tsc_unstable("possible TSC halt in C2"); |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 504 | #endif |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 505 | /* Compute time (ticks) that we were actually asleep */ |
| 506 | sleep_ticks = ticks_elapsed(t1, t2); |
| 507 | |
| 508 | /* Tell the scheduler how much we idled: */ |
| 509 | sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); |
| 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | /* Re-enable interrupts */ |
| 512 | local_irq_enable(); |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 513 | /* Do not account our idle-switching overhead: */ |
| 514 | sleep_ticks -= cx->latency_ticks + C2_OVERHEAD; |
| 515 | |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 516 | current_thread_info()->status |= TS_POLLING; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 517 | acpi_state_timer_broadcast(pr, cx, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | break; |
| 519 | |
| 520 | case ACPI_STATE_C3: |
Venkatesh Pallipadi | 18eab85 | 2007-06-15 19:37:00 -0400 | [diff] [blame] | 521 | /* |
| 522 | * disable bus master |
| 523 | * bm_check implies we need ARB_DIS |
| 524 | * !bm_check implies we need cache flush |
| 525 | * bm_control implies whether we can do ARB_DIS |
| 526 | * |
| 527 | * That leaves a case where bm_check is set and bm_control is |
| 528 | * not set. In that case we cannot do much, we enter C3 |
| 529 | * without doing anything. |
| 530 | */ |
| 531 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 532 | if (atomic_inc_return(&c3_cpu_count) == |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 533 | num_online_cpus()) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 534 | /* |
| 535 | * All CPUs are trying to go to C3 |
| 536 | * Disable bus master arbitration |
| 537 | */ |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 538 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 539 | } |
Venkatesh Pallipadi | 18eab85 | 2007-06-15 19:37:00 -0400 | [diff] [blame] | 540 | } else if (!pr->flags.bm_check) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 541 | /* SMP with no shared cache... Invalidate cache */ |
| 542 | ACPI_FLUSH_CPU_CACHE(); |
| 543 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 544 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | /* Get start time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 546 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | /* Invoke C3 */ |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 548 | acpi_state_timer_broadcast(pr, cx, 1); |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 549 | /* Tell the scheduler that we are going deep-idle: */ |
| 550 | sched_clock_idle_sleep_event(); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 551 | acpi_cstate_enter(cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | /* Get end time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 553 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Venkatesh Pallipadi | 18eab85 | 2007-06-15 19:37:00 -0400 | [diff] [blame] | 554 | if (pr->flags.bm_check && pr->flags.bm_control) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 555 | /* Enable bus master arbitration */ |
| 556 | atomic_dec(&c3_cpu_count); |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 557 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 558 | } |
| 559 | |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 560 | #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC) |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 561 | /* TSC halts in C3, so notify users */ |
john stultz | 5a90cf2 | 2007-05-02 19:27:08 +0200 | [diff] [blame] | 562 | mark_tsc_unstable("TSC halts in C3"); |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 563 | #endif |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 564 | /* Compute time (ticks) that we were actually asleep */ |
| 565 | sleep_ticks = ticks_elapsed(t1, t2); |
| 566 | /* Tell the scheduler how much we idled: */ |
| 567 | sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); |
| 568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | /* Re-enable interrupts */ |
| 570 | local_irq_enable(); |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 571 | /* Do not account our idle-switching overhead: */ |
| 572 | sleep_ticks -= cx->latency_ticks + C3_OVERHEAD; |
| 573 | |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 574 | current_thread_info()->status |= TS_POLLING; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 575 | acpi_state_timer_broadcast(pr, cx, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | break; |
| 577 | |
| 578 | default: |
| 579 | local_irq_enable(); |
| 580 | return; |
| 581 | } |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 582 | cx->usage++; |
| 583 | if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0)) |
| 584 | cx->time += sleep_ticks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
| 586 | next_state = pr->power.state; |
| 587 | |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 588 | #ifdef CONFIG_HOTPLUG_CPU |
| 589 | /* Don't do promotion/demotion */ |
| 590 | if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 591 | !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] | 592 | next_state = cx; |
| 593 | goto end; |
| 594 | } |
| 595 | #endif |
| 596 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | /* |
| 598 | * Promotion? |
| 599 | * ---------- |
| 600 | * Track the number of longs (time asleep is greater than threshold) |
| 601 | * and promote when the count threshold is reached. Note that bus |
| 602 | * mastering activity may prevent promotions. |
| 603 | * Do not promote above max_cstate. |
| 604 | */ |
| 605 | if (cx->promotion.state && |
| 606 | ((cx->promotion.state - pr->power.states) <= max_cstate)) { |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 607 | if (sleep_ticks > cx->promotion.threshold.ticks && |
| 608 | cx->promotion.state->latency <= system_latency_constraint()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | cx->promotion.count++; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 610 | cx->demotion.count = 0; |
| 611 | if (cx->promotion.count >= |
| 612 | cx->promotion.threshold.count) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | if (pr->flags.bm_check) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 614 | if (! |
| 615 | (pr->power.bm_activity & cx-> |
| 616 | promotion.threshold.bm)) { |
| 617 | next_state = |
| 618 | cx->promotion.state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | goto end; |
| 620 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 621 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | next_state = cx->promotion.state; |
| 623 | goto end; |
| 624 | } |
| 625 | } |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * Demotion? |
| 631 | * --------- |
| 632 | * Track the number of shorts (time asleep is less than time threshold) |
| 633 | * and demote when the usage threshold is reached. |
| 634 | */ |
| 635 | if (cx->demotion.state) { |
| 636 | if (sleep_ticks < cx->demotion.threshold.ticks) { |
| 637 | cx->demotion.count++; |
| 638 | cx->promotion.count = 0; |
| 639 | if (cx->demotion.count >= cx->demotion.threshold.count) { |
| 640 | next_state = cx->demotion.state; |
| 641 | goto end; |
| 642 | } |
| 643 | } |
| 644 | } |
| 645 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 646 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | /* |
| 648 | * Demote if current state exceeds max_cstate |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 649 | * or if the latency of the current state is unacceptable |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | */ |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 651 | if ((pr->power.state - pr->power.states) > max_cstate || |
| 652 | pr->power.state->latency > system_latency_constraint()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | if (cx->demotion.state) |
| 654 | next_state = cx->demotion.state; |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * New Cx State? |
| 659 | * ------------- |
| 660 | * If we're going to start using a new Cx state we must clean up |
| 661 | * from the previous and prepare to use the new. |
| 662 | */ |
| 663 | if (next_state != pr->power.state) |
| 664 | acpi_processor_power_activate(pr, next_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 667 | static int acpi_processor_set_power_policy(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | { |
| 669 | unsigned int i; |
| 670 | unsigned int state_is_set = 0; |
| 671 | struct acpi_processor_cx *lower = NULL; |
| 672 | struct acpi_processor_cx *higher = NULL; |
| 673 | struct acpi_processor_cx *cx; |
| 674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | |
| 676 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 677 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | |
| 679 | /* |
| 680 | * This function sets the default Cx state policy (OS idle handler). |
| 681 | * Our scheme is to promote quickly to C2 but more conservatively |
| 682 | * to C3. We're favoring C2 for its characteristics of low latency |
| 683 | * (quick response), good power savings, and ability to allow bus |
| 684 | * mastering activity. Note that the Cx state policy is completely |
| 685 | * customizable and can be altered dynamically. |
| 686 | */ |
| 687 | |
| 688 | /* startup state */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 689 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | cx = &pr->power.states[i]; |
| 691 | if (!cx->valid) |
| 692 | continue; |
| 693 | |
| 694 | if (!state_is_set) |
| 695 | pr->power.state = cx; |
| 696 | state_is_set++; |
| 697 | break; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 698 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
| 700 | if (!state_is_set) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 701 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
| 703 | /* demotion */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 704 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | cx = &pr->power.states[i]; |
| 706 | if (!cx->valid) |
| 707 | continue; |
| 708 | |
| 709 | if (lower) { |
| 710 | cx->demotion.state = lower; |
| 711 | cx->demotion.threshold.ticks = cx->latency_ticks; |
| 712 | cx->demotion.threshold.count = 1; |
| 713 | if (cx->type == ACPI_STATE_C3) |
| 714 | cx->demotion.threshold.bm = bm_history; |
| 715 | } |
| 716 | |
| 717 | lower = cx; |
| 718 | } |
| 719 | |
| 720 | /* promotion */ |
| 721 | for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) { |
| 722 | cx = &pr->power.states[i]; |
| 723 | if (!cx->valid) |
| 724 | continue; |
| 725 | |
| 726 | if (higher) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 727 | cx->promotion.state = higher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | cx->promotion.threshold.ticks = cx->latency_ticks; |
| 729 | if (cx->type >= ACPI_STATE_C2) |
| 730 | cx->promotion.threshold.count = 4; |
| 731 | else |
| 732 | cx->promotion.threshold.count = 10; |
| 733 | if (higher->type == ACPI_STATE_C3) |
| 734 | cx->promotion.threshold.bm = bm_history; |
| 735 | } |
| 736 | |
| 737 | higher = cx; |
| 738 | } |
| 739 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 740 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | } |
| 742 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 743 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
| 746 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 747 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | |
| 749 | if (!pr->pblk) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 750 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | /* if info is obtained from pblk/fadt, type equals state */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
| 754 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; |
| 755 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 756 | #ifndef CONFIG_HOTPLUG_CPU |
| 757 | /* |
| 758 | * Check for P_LVL2_UP flag before entering C2 and above on |
| 759 | * an SMP system. |
| 760 | */ |
Alexey Starikovskiy | ad71860a | 2007-02-02 19:48:19 +0300 | [diff] [blame] | 761 | if ((num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 762 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 763 | return -ENODEV; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 764 | #endif |
| 765 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | /* determine C2 and C3 address from pblk */ |
| 767 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; |
| 768 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; |
| 769 | |
| 770 | /* determine latencies from FADT */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 771 | pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency; |
| 772 | pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
| 774 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 775 | "lvl2[0x%08x] lvl3[0x%08x]\n", |
| 776 | pr->power.states[ACPI_STATE_C2].address, |
| 777 | pr->power.states[ACPI_STATE_C3].address)); |
| 778 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 779 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | } |
| 781 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 782 | static int acpi_processor_get_power_info_default(struct acpi_processor *pr) |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 783 | { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 784 | if (!pr->power.states[ACPI_STATE_C1].valid) { |
| 785 | /* set the first C-State to C1 */ |
| 786 | /* all processors need to support C1 */ |
| 787 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; |
| 788 | pr->power.states[ACPI_STATE_C1].valid = 1; |
| 789 | } |
| 790 | /* the C0 state only exists as a filler in our array */ |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 791 | pr->power.states[ACPI_STATE_C0].valid = 1; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 792 | return 0; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 793 | } |
| 794 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 795 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 797 | acpi_status status = 0; |
| 798 | acpi_integer count; |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 799 | int current_count; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 800 | int i; |
| 801 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 802 | union acpi_object *cst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | if (nocst) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 806 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 808 | current_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
| 810 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); |
| 811 | if (ACPI_FAILURE(status)) { |
| 812 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 813 | return -ENODEV; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 814 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 816 | cst = buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | |
| 818 | /* There must be at least 2 elements */ |
| 819 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 820 | printk(KERN_ERR PREFIX "not enough elements in _CST\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | status = -EFAULT; |
| 822 | goto end; |
| 823 | } |
| 824 | |
| 825 | count = cst->package.elements[0].integer.value; |
| 826 | |
| 827 | /* Validate number of power states. */ |
| 828 | if (count < 1 || count != cst->package.count - 1) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 829 | printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | status = -EFAULT; |
| 831 | goto end; |
| 832 | } |
| 833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | /* Tell driver that at least _CST is supported. */ |
| 835 | pr->flags.has_cst = 1; |
| 836 | |
| 837 | for (i = 1; i <= count; i++) { |
| 838 | union acpi_object *element; |
| 839 | union acpi_object *obj; |
| 840 | struct acpi_power_register *reg; |
| 841 | struct acpi_processor_cx cx; |
| 842 | |
| 843 | memset(&cx, 0, sizeof(cx)); |
| 844 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 845 | element = &(cst->package.elements[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | if (element->type != ACPI_TYPE_PACKAGE) |
| 847 | continue; |
| 848 | |
| 849 | if (element->package.count != 4) |
| 850 | continue; |
| 851 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 852 | obj = &(element->package.elements[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
| 854 | if (obj->type != ACPI_TYPE_BUFFER) |
| 855 | continue; |
| 856 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 857 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | |
| 859 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 860 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | continue; |
| 862 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | /* There should be an easy way to extract an integer... */ |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 864 | obj = &(element->package.elements[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | if (obj->type != ACPI_TYPE_INTEGER) |
| 866 | continue; |
| 867 | |
| 868 | cx.type = obj->integer.value; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 869 | /* |
| 870 | * Some buggy BIOSes won't list C1 in _CST - |
| 871 | * Let acpi_processor_get_power_info_default() handle them later |
| 872 | */ |
| 873 | if (i == 1 && cx.type != ACPI_STATE_C1) |
| 874 | current_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 876 | cx.address = reg->address; |
| 877 | cx.index = current_count + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 879 | cx.space_id = ACPI_CSTATE_SYSTEMIO; |
| 880 | if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { |
| 881 | if (acpi_processor_ffh_cstate_probe |
| 882 | (pr->id, &cx, reg) == 0) { |
| 883 | cx.space_id = ACPI_CSTATE_FFH; |
| 884 | } else if (cx.type != ACPI_STATE_C1) { |
| 885 | /* |
| 886 | * C1 is a special case where FIXED_HARDWARE |
| 887 | * can be handled in non-MWAIT way as well. |
| 888 | * In that case, save this _CST entry info. |
| 889 | * That is, we retain space_id of SYSTEM_IO for |
| 890 | * halt based C1. |
| 891 | * Otherwise, ignore this info and continue. |
| 892 | */ |
| 893 | continue; |
| 894 | } |
| 895 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 897 | obj = &(element->package.elements[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | if (obj->type != ACPI_TYPE_INTEGER) |
| 899 | continue; |
| 900 | |
| 901 | cx.latency = obj->integer.value; |
| 902 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 903 | obj = &(element->package.elements[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | if (obj->type != ACPI_TYPE_INTEGER) |
| 905 | continue; |
| 906 | |
| 907 | cx.power = obj->integer.value; |
| 908 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 909 | current_count++; |
| 910 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); |
| 911 | |
| 912 | /* |
| 913 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 |
| 914 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) |
| 915 | */ |
| 916 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { |
| 917 | printk(KERN_WARNING |
| 918 | "Limiting number of power states to max (%d)\n", |
| 919 | ACPI_PROCESSOR_MAX_POWER); |
| 920 | printk(KERN_WARNING |
| 921 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); |
| 922 | break; |
| 923 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | } |
| 925 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 926 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 927 | current_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | |
| 929 | /* Validate number of power states discovered */ |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 930 | if (current_count < 2) |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 931 | status = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 933 | end: |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 934 | kfree(buffer.pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 936 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | } |
| 938 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) |
| 940 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | |
| 942 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 943 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
| 945 | /* |
| 946 | * C2 latency must be less than or equal to 100 |
| 947 | * microseconds. |
| 948 | */ |
| 949 | else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { |
| 950 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 951 | "latency too large [%d]\n", cx->latency)); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 952 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | } |
| 954 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | /* |
| 956 | * Otherwise we've met all of our C2 requirements. |
| 957 | * Normalize the C2 latency to expidite policy |
| 958 | */ |
| 959 | cx->valid = 1; |
| 960 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
| 961 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 962 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | } |
| 964 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 965 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
| 966 | struct acpi_processor_cx *cx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 968 | static int bm_check_flag; |
| 969 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
| 971 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 972 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
| 974 | /* |
| 975 | * C3 latency must be less than or equal to 1000 |
| 976 | * microseconds. |
| 977 | */ |
| 978 | else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { |
| 979 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 980 | "latency too large [%d]\n", cx->latency)); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 981 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | } |
| 983 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | /* |
| 985 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) |
| 986 | * DMA transfers are used by any ISA device to avoid livelock. |
| 987 | * Note that we could disable Type-F DMA (as recommended by |
| 988 | * the erratum), but this is known to disrupt certain ISA |
| 989 | * devices thus we take the conservative approach. |
| 990 | */ |
| 991 | else if (errata.piix4.fdma) { |
| 992 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 993 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 994 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | } |
| 996 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 997 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
| 998 | if (!bm_check_flag) { |
| 999 | /* Determine whether bm_check is needed based on CPU */ |
| 1000 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); |
| 1001 | bm_check_flag = pr->flags.bm_check; |
| 1002 | } else { |
| 1003 | pr->flags.bm_check = bm_check_flag; |
| 1004 | } |
| 1005 | |
| 1006 | if (pr->flags.bm_check) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1007 | if (!pr->flags.bm_control) { |
Venki Pallipadi | ed3110e | 2007-07-31 12:04:31 -0700 | [diff] [blame] | 1008 | if (pr->flags.has_cst != 1) { |
| 1009 | /* bus mastering control is necessary */ |
| 1010 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 1011 | "C3 support requires BM control\n")); |
| 1012 | return; |
| 1013 | } else { |
| 1014 | /* Here we enter C3 without bus mastering */ |
| 1015 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 1016 | "C3 support without BM control\n")); |
| 1017 | } |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1018 | } |
| 1019 | } else { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1020 | /* |
| 1021 | * WBINVD should be set in fadt, for C3 state to be |
| 1022 | * supported on when bm_check is not required. |
| 1023 | */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1024 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1025 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1026 | "Cache invalidation should work properly" |
| 1027 | " for C3 to be enabled on SMP systems\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1028 | return; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1029 | } |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 1030 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1031 | } |
| 1032 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | /* |
| 1034 | * Otherwise we've met all of our C3 requirements. |
| 1035 | * Normalize the C3 latency to expidite policy. Enable |
| 1036 | * checking of bus mastering status (bm_check) so we can |
| 1037 | * use this in our C3 policy |
| 1038 | */ |
| 1039 | cx->valid = 1; |
| 1040 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1042 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | } |
| 1044 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
| 1046 | { |
| 1047 | unsigned int i; |
| 1048 | unsigned int working = 0; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 1049 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1050 | pr->power.timer_broadcast_on_state = INT_MAX; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 1051 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1052 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
| 1054 | |
| 1055 | switch (cx->type) { |
| 1056 | case ACPI_STATE_C1: |
| 1057 | cx->valid = 1; |
| 1058 | break; |
| 1059 | |
| 1060 | case ACPI_STATE_C2: |
| 1061 | acpi_processor_power_verify_c2(cx); |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 1062 | if (cx->valid) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1063 | acpi_timer_check_state(i, pr, cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | break; |
| 1065 | |
| 1066 | case ACPI_STATE_C3: |
| 1067 | acpi_processor_power_verify_c3(pr, cx); |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 1068 | if (cx->valid) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1069 | acpi_timer_check_state(i, pr, cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | break; |
| 1071 | } |
| 1072 | |
| 1073 | if (cx->valid) |
| 1074 | working++; |
| 1075 | } |
| 1076 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1077 | acpi_propagate_timer_broadcast(pr); |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 1078 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | return (working); |
| 1080 | } |
| 1081 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1082 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | { |
| 1084 | unsigned int i; |
| 1085 | int result; |
| 1086 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | |
| 1088 | /* NOTE: the idle thread may not be running while calling |
| 1089 | * this function */ |
| 1090 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 1091 | /* Zero initialize all the C-states info. */ |
| 1092 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
| 1093 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | result = acpi_processor_get_power_info_cst(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 1095 | if (result == -ENODEV) |
Darrick J. Wong | c5a114f | 2006-10-19 23:28:28 -0700 | [diff] [blame] | 1096 | result = acpi_processor_get_power_info_fadt(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 1097 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 1098 | if (result) |
| 1099 | return result; |
| 1100 | |
| 1101 | acpi_processor_get_power_info_default(pr); |
| 1102 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 1103 | pr->power.count = acpi_processor_power_verify(pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | |
| 1105 | /* |
| 1106 | * Set Default Policy |
| 1107 | * ------------------ |
| 1108 | * Now that we know which states are supported, set the default |
| 1109 | * policy. Note that this policy can be changed dynamically |
| 1110 | * (e.g. encourage deeper sleeps to conserve battery life when |
| 1111 | * not on AC). |
| 1112 | */ |
| 1113 | result = acpi_processor_set_power_policy(pr); |
| 1114 | if (result) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1115 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | |
| 1117 | /* |
| 1118 | * if one state of type C2 or C3 is available, mark this |
| 1119 | * CPU as being "idle manageable" |
| 1120 | */ |
| 1121 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 1122 | if (pr->power.states[i].valid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | pr->power.count = i; |
Linus Torvalds | 2203d6e | 2005-11-18 07:29:51 -0800 | [diff] [blame] | 1124 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
| 1125 | pr->flags.power = 1; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 1126 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | } |
| 1128 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1129 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | } |
| 1131 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1132 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1134 | int result = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | |
| 1137 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1138 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1140 | if (nocst) { |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1141 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | } |
| 1143 | |
| 1144 | if (!pr->flags.power_setup_done) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1145 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | |
| 1147 | /* Fall back to the default idle loop */ |
| 1148 | pm_idle = pm_idle_save; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1149 | synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | |
| 1151 | pr->flags.power = 0; |
| 1152 | result = acpi_processor_get_power_info(pr); |
| 1153 | if ((pr->flags.power == 1) && (pr->flags.power_setup_done)) |
| 1154 | pm_idle = acpi_processor_idle; |
| 1155 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1156 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | } |
| 1158 | |
| 1159 | /* proc interface */ |
| 1160 | |
| 1161 | static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) |
| 1162 | { |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 1163 | struct acpi_processor *pr = seq->private; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1164 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | |
| 1167 | if (!pr) |
| 1168 | goto end; |
| 1169 | |
| 1170 | seq_printf(seq, "active state: C%zd\n" |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1171 | "max_cstate: C%d\n" |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1172 | "bus master activity: %08x\n" |
| 1173 | "maximum allowed latency: %d usec\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1174 | pr->power.state ? pr->power.state - pr->power.states : 0, |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1175 | max_cstate, (unsigned)pr->power.bm_activity, |
| 1176 | system_latency_constraint()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | |
| 1178 | seq_puts(seq, "states:\n"); |
| 1179 | |
| 1180 | for (i = 1; i <= pr->power.count; i++) { |
| 1181 | seq_printf(seq, " %cC%d: ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1182 | (&pr->power.states[i] == |
| 1183 | pr->power.state ? '*' : ' '), i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | |
| 1185 | if (!pr->power.states[i].valid) { |
| 1186 | seq_puts(seq, "<not supported>\n"); |
| 1187 | continue; |
| 1188 | } |
| 1189 | |
| 1190 | switch (pr->power.states[i].type) { |
| 1191 | case ACPI_STATE_C1: |
| 1192 | seq_printf(seq, "type[C1] "); |
| 1193 | break; |
| 1194 | case ACPI_STATE_C2: |
| 1195 | seq_printf(seq, "type[C2] "); |
| 1196 | break; |
| 1197 | case ACPI_STATE_C3: |
| 1198 | seq_printf(seq, "type[C3] "); |
| 1199 | break; |
| 1200 | default: |
| 1201 | seq_printf(seq, "type[--] "); |
| 1202 | break; |
| 1203 | } |
| 1204 | |
| 1205 | if (pr->power.states[i].promotion.state) |
| 1206 | seq_printf(seq, "promotion[C%zd] ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1207 | (pr->power.states[i].promotion.state - |
| 1208 | pr->power.states)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | else |
| 1210 | seq_puts(seq, "promotion[--] "); |
| 1211 | |
| 1212 | if (pr->power.states[i].demotion.state) |
| 1213 | seq_printf(seq, "demotion[C%zd] ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1214 | (pr->power.states[i].demotion.state - |
| 1215 | pr->power.states)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | else |
| 1217 | seq_puts(seq, "demotion[--] "); |
| 1218 | |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 1219 | seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1220 | pr->power.states[i].latency, |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 1221 | pr->power.states[i].usage, |
Alexey Starikovskiy | b0b7eaa | 2007-01-25 22:39:44 -0500 | [diff] [blame] | 1222 | (unsigned long long)pr->power.states[i].time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | } |
| 1224 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1225 | end: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1226 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | } |
| 1228 | |
| 1229 | static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) |
| 1230 | { |
| 1231 | return single_open(file, acpi_processor_power_seq_show, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1232 | PDE(inode)->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | } |
| 1234 | |
Arjan van de Ven | d750803 | 2006-07-04 13:06:00 -0400 | [diff] [blame] | 1235 | static const struct file_operations acpi_processor_power_fops = { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1236 | .open = acpi_processor_power_open_fs, |
| 1237 | .read = seq_read, |
| 1238 | .llseek = seq_lseek, |
| 1239 | .release = single_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | }; |
| 1241 | |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1242 | #ifdef CONFIG_SMP |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1243 | static void smp_callback(void *v) |
| 1244 | { |
| 1245 | /* we already woke the CPU up, nothing more to do */ |
| 1246 | } |
| 1247 | |
| 1248 | /* |
| 1249 | * This function gets called when a part of the kernel has a new latency |
| 1250 | * requirement. This means we need to get all processors out of their C-state, |
| 1251 | * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that |
| 1252 | * wakes them all right up. |
| 1253 | */ |
| 1254 | static int acpi_processor_latency_notify(struct notifier_block *b, |
| 1255 | unsigned long l, void *v) |
| 1256 | { |
| 1257 | smp_call_function(smp_callback, NULL, 0, 1); |
| 1258 | return NOTIFY_OK; |
| 1259 | } |
| 1260 | |
| 1261 | static struct notifier_block acpi_processor_latency_notifier = { |
| 1262 | .notifier_call = acpi_processor_latency_notify, |
| 1263 | }; |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1264 | #endif |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1265 | |
Pierre Ossman | 7af8b66 | 2006-10-10 14:20:31 -0700 | [diff] [blame] | 1266 | int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1267 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1269 | acpi_status status = 0; |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 1270 | static int first_run; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1271 | struct proc_dir_entry *entry = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | unsigned int i; |
| 1273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | |
| 1275 | if (!first_run) { |
| 1276 | dmi_check_system(processor_power_dmi_table); |
| 1277 | if (max_cstate < ACPI_C_STATES_MAX) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1278 | printk(KERN_NOTICE |
| 1279 | "ACPI: processor limited to max C-state %d\n", |
| 1280 | max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | first_run++; |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1282 | #ifdef CONFIG_SMP |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1283 | register_latency_notifier(&acpi_processor_latency_notifier); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1284 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | } |
| 1286 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1287 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1288 | return -EINVAL; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1289 | |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1290 | if (acpi_gbl_FADT.cst_control && !nocst) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1291 | status = |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1292 | 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] | 1293 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1294 | ACPI_EXCEPTION((AE_INFO, status, |
| 1295 | "Notifying BIOS of _CST ability failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | } |
| 1297 | } |
| 1298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | acpi_processor_get_power_info(pr); |
| 1300 | |
| 1301 | /* |
| 1302 | * Install the idle handler if processor power management is supported. |
| 1303 | * Note that we use previously set idle handler will be used on |
| 1304 | * platforms that only support C1. |
| 1305 | */ |
| 1306 | if ((pr->flags.power) && (!boot_option_idle_override)) { |
| 1307 | printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); |
| 1308 | for (i = 1; i <= pr->power.count; i++) |
| 1309 | if (pr->power.states[i].valid) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1310 | printk(" C%d[C%d]", i, |
| 1311 | pr->power.states[i].type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | printk(")\n"); |
| 1313 | |
| 1314 | if (pr->id == 0) { |
| 1315 | pm_idle_save = pm_idle; |
| 1316 | pm_idle = acpi_processor_idle; |
| 1317 | } |
| 1318 | } |
| 1319 | |
| 1320 | /* 'power' [R] */ |
| 1321 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1322 | S_IRUGO, acpi_device_dir(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | if (!entry) |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1324 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | else { |
| 1326 | entry->proc_fops = &acpi_processor_power_fops; |
| 1327 | entry->data = acpi_driver_data(device); |
| 1328 | entry->owner = THIS_MODULE; |
| 1329 | } |
| 1330 | |
| 1331 | pr->flags.power_setup_done = 1; |
| 1332 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1333 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | } |
| 1335 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1336 | int acpi_processor_power_exit(struct acpi_processor *pr, |
| 1337 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | |
| 1340 | pr->flags.power_setup_done = 0; |
| 1341 | |
| 1342 | if (acpi_device_dir(device)) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1343 | remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
| 1344 | acpi_device_dir(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | |
| 1346 | /* Unregister the idle handler when processor #0 is removed. */ |
| 1347 | if (pr->id == 0) { |
| 1348 | pm_idle = pm_idle_save; |
| 1349 | |
| 1350 | /* |
| 1351 | * We are about to unload the current idle thread pm callback |
| 1352 | * (pm_idle), Wait for all processors to update cached/local |
| 1353 | * copies of pm_idle before proceeding. |
| 1354 | */ |
| 1355 | cpu_idle_wait(); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1356 | #ifdef CONFIG_SMP |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1357 | unregister_latency_notifier(&acpi_processor_latency_notifier); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1358 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | } |
| 1360 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1361 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | } |