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 | |
Thomas Gleixner | 5c95d3f | 2007-02-15 23:25:53 -0500 | [diff] [blame] | 54 | /* |
| 55 | * Include the apic definitions for x86 to have the APIC timer related defines |
| 56 | * available also for UP (on SMP it gets magically included via linux/smp.h). |
| 57 | */ |
| 58 | #ifdef CONFIG_X86 |
| 59 | #include <asm/apic.h> |
| 60 | #endif |
| 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #include <asm/io.h> |
| 63 | #include <asm/uaccess.h> |
| 64 | |
| 65 | #include <acpi/acpi_bus.h> |
| 66 | #include <acpi/processor.h> |
| 67 | |
| 68 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 |
| 69 | #define ACPI_PROCESSOR_CLASS "processor" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
Len Brown | f52fd66 | 2007-02-12 22:42:12 -0500 | [diff] [blame] | 71 | ACPI_MODULE_NAME("processor_idle"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #define ACPI_PROCESSOR_FILE_POWER "power" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000) |
| 74 | #define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */ |
| 75 | #define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */ |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 76 | static void (*pm_idle_save) (void) __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | module_param(max_cstate, uint, 0644); |
| 78 | |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 79 | static unsigned int nocst __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | module_param(nocst, uint, 0000); |
| 81 | |
| 82 | /* |
| 83 | * bm_history -- bit-mask with a bit per jiffy of bus-master activity |
| 84 | * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms |
| 85 | * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms |
| 86 | * 100 HZ: 0x0000000F: 4 jiffies = 40ms |
| 87 | * reduce history for more aggressive entry into C3 |
| 88 | */ |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 89 | static unsigned int bm_history __read_mostly = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 90 | (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | module_param(bm_history, uint, 0644); |
| 92 | /* -------------------------------------------------------------------------- |
| 93 | Power Management |
| 94 | -------------------------------------------------------------------------- */ |
| 95 | |
| 96 | /* |
| 97 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. |
| 98 | * For now disable this. Probably a bug somewhere else. |
| 99 | * |
| 100 | * To skip this limit, boot/load with a large max_cstate limit. |
| 101 | */ |
David Shaohua Li | 335f16b | 2005-06-22 18:37:00 -0400 | [diff] [blame] | 102 | static int set_max_cstate(struct dmi_system_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | { |
| 104 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) |
| 105 | return 0; |
| 106 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 107 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 108 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
| 109 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 111 | max_cstate = (long)id->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
| 113 | return 0; |
| 114 | } |
| 115 | |
Ashok Raj | 7ded568 | 2006-02-03 21:51:23 +0100 | [diff] [blame] | 116 | /* Actually this shouldn't be __cpuinitdata, would be better to fix the |
| 117 | callers to only run once -AK */ |
| 118 | static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 119 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 120 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
Bartlomiej Swiercz | f831335 | 2006-05-29 07:16:00 -0400 | [diff] [blame] | 121 | DMI_MATCH(DMI_BIOS_VERSION,"1SET70WW")}, (void *)1}, |
| 122 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 123 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 124 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1}, |
| 125 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 126 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 127 | DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1}, |
| 128 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 129 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 130 | DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1}, |
| 131 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 132 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 133 | DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1}, |
| 134 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 135 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 136 | DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1}, |
| 137 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 138 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 139 | DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1}, |
| 140 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 141 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 142 | DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1}, |
| 143 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 144 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 145 | DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1}, |
| 146 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 147 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 148 | DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1}, |
| 149 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 150 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 151 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1}, |
| 152 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 153 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 154 | DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1}, |
| 155 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 156 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 157 | DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1}, |
| 158 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 159 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 160 | DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1}, |
| 161 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 162 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 163 | DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1}, |
| 164 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 165 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 166 | DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1}, |
| 167 | { set_max_cstate, "Medion 41700", { |
| 168 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 169 | DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1}, |
| 170 | { set_max_cstate, "Clevo 5600D", { |
| 171 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 172 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 173 | (void *)2}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | {}, |
| 175 | }; |
| 176 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 177 | static inline u32 ticks_elapsed(u32 t1, u32 t2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | { |
| 179 | if (t2 >= t1) |
| 180 | return (t2 - t1); |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 181 | else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); |
| 183 | else |
| 184 | return ((0xFFFFFFFF - t1) + t2); |
| 185 | } |
| 186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | static void |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 188 | acpi_processor_power_activate(struct acpi_processor *pr, |
| 189 | struct acpi_processor_cx *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 191 | struct acpi_processor_cx *old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
| 193 | if (!pr || !new) |
| 194 | return; |
| 195 | |
| 196 | old = pr->power.state; |
| 197 | |
| 198 | if (old) |
| 199 | old->promotion.count = 0; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 200 | new->demotion.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
| 202 | /* Cleanup from old state. */ |
| 203 | if (old) { |
| 204 | switch (old->type) { |
| 205 | case ACPI_STATE_C3: |
| 206 | /* Disable bus master reload */ |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 207 | if (new->type != ACPI_STATE_C3 && pr->flags.bm_check) |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 208 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | break; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | /* Prepare to use new state. */ |
| 214 | switch (new->type) { |
| 215 | case ACPI_STATE_C3: |
| 216 | /* Enable bus master reload */ |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 217 | if (old->type != ACPI_STATE_C3 && pr->flags.bm_check) |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 218 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | break; |
| 220 | } |
| 221 | |
| 222 | pr->power.state = new; |
| 223 | |
| 224 | return; |
| 225 | } |
| 226 | |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 227 | static void acpi_safe_halt(void) |
| 228 | { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 229 | current_thread_info()->status &= ~TS_POLLING; |
Ingo Molnar | 0888f06 | 2006-12-22 01:11:56 -0800 | [diff] [blame] | 230 | /* |
| 231 | * TS_POLLING-cleared state must be visible before we |
| 232 | * test NEED_RESCHED: |
| 233 | */ |
| 234 | smp_mb(); |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 235 | if (!need_resched()) |
| 236 | safe_halt(); |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 237 | current_thread_info()->status |= TS_POLLING; |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 238 | } |
| 239 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 240 | static atomic_t c3_cpu_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 242 | /* Common C-state entry for C2, C3, .. */ |
| 243 | static void acpi_cstate_enter(struct acpi_processor_cx *cstate) |
| 244 | { |
| 245 | if (cstate->space_id == ACPI_CSTATE_FFH) { |
| 246 | /* Call into architectural FFH based C-state */ |
| 247 | acpi_processor_ffh_cstate_enter(cstate); |
| 248 | } else { |
| 249 | int unused; |
| 250 | /* IO port based C-state */ |
| 251 | inb(cstate->address); |
| 252 | /* Dummy wait op - must do something useless after P_LVL2 read |
| 253 | because chipsets cannot guarantee that STPCLK# signal |
| 254 | gets asserted in time to freeze execution properly. */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 255 | unused = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 256 | } |
| 257 | } |
| 258 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 259 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
| 260 | |
| 261 | /* |
| 262 | * Some BIOS implementations switch to C3 in the published C2 state. |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 263 | * This seems to be a common problem on AMD boxen, but other vendors |
| 264 | * are affected too. We pick the most conservative approach: we assume |
| 265 | * that the local APIC stops in both C2 and C3. |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 266 | */ |
| 267 | static void acpi_timer_check_state(int state, struct acpi_processor *pr, |
| 268 | struct acpi_processor_cx *cx) |
| 269 | { |
| 270 | struct acpi_processor_power *pwr = &pr->power; |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 271 | 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] | 272 | |
| 273 | /* |
| 274 | * Check, if one of the previous states already marked the lapic |
| 275 | * unstable |
| 276 | */ |
| 277 | if (pwr->timer_broadcast_on_state < state) |
| 278 | return; |
| 279 | |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 280 | if (cx->type >= type) |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 281 | pr->power.timer_broadcast_on_state = state; |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) |
| 285 | { |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 286 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
| 287 | unsigned long reason; |
| 288 | |
| 289 | reason = pr->power.timer_broadcast_on_state < INT_MAX ? |
| 290 | CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; |
| 291 | |
| 292 | clockevents_notify(reason, &pr->id); |
| 293 | #else |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 294 | cpumask_t mask = cpumask_of_cpu(pr->id); |
| 295 | |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 296 | if (pr->power.timer_broadcast_on_state < INT_MAX) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 297 | on_each_cpu(switch_APIC_timer_to_ipi, &mask, 1, 1); |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 298 | else |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 299 | on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 300 | #endif |
| 301 | } |
| 302 | |
| 303 | /* Power(C) State timer broadcast control */ |
| 304 | static void acpi_state_timer_broadcast(struct acpi_processor *pr, |
| 305 | struct acpi_processor_cx *cx, |
| 306 | int broadcast) |
| 307 | { |
| 308 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
| 309 | |
| 310 | int state = cx - pr->power.states; |
| 311 | |
| 312 | if (state >= pr->power.timer_broadcast_on_state) { |
| 313 | unsigned long reason; |
| 314 | |
| 315 | reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : |
| 316 | CLOCK_EVT_NOTIFY_BROADCAST_EXIT; |
| 317 | clockevents_notify(reason, &pr->id); |
| 318 | } |
| 319 | #endif |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | #else |
| 323 | |
| 324 | static void acpi_timer_check_state(int state, struct acpi_processor *pr, |
| 325 | struct acpi_processor_cx *cstate) { } |
| 326 | static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) { } |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 327 | static void acpi_state_timer_broadcast(struct acpi_processor *pr, |
| 328 | struct acpi_processor_cx *cx, |
| 329 | int broadcast) |
| 330 | { |
| 331 | } |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 332 | |
| 333 | #endif |
| 334 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 335 | static void acpi_processor_idle(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 337 | struct acpi_processor *pr = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | struct acpi_processor_cx *cx = NULL; |
| 339 | struct acpi_processor_cx *next_state = NULL; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 340 | int sleep_ticks = 0; |
| 341 | u32 t1, t2 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 343 | pr = processors[smp_processor_id()]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | if (!pr) |
| 345 | return; |
| 346 | |
| 347 | /* |
| 348 | * Interrupts must be disabled during bus mastering calculations and |
| 349 | * for C2/C3 transitions. |
| 350 | */ |
| 351 | local_irq_disable(); |
| 352 | |
| 353 | /* |
| 354 | * Check whether we truly need to go idle, or should |
| 355 | * reschedule: |
| 356 | */ |
| 357 | if (unlikely(need_resched())) { |
| 358 | local_irq_enable(); |
| 359 | return; |
| 360 | } |
| 361 | |
| 362 | cx = pr->power.state; |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 363 | if (!cx) { |
| 364 | if (pm_idle_save) |
| 365 | pm_idle_save(); |
| 366 | else |
| 367 | acpi_safe_halt(); |
| 368 | return; |
| 369 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
| 371 | /* |
| 372 | * Check BM Activity |
| 373 | * ----------------- |
| 374 | * Check for bus mastering activity (if required), record, and check |
| 375 | * for demotion. |
| 376 | */ |
| 377 | if (pr->flags.bm_check) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 378 | u32 bm_status = 0; |
| 379 | unsigned long diff = jiffies - pr->power.bm_check_timestamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 381 | if (diff > 31) |
| 382 | diff = 31; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 384 | pr->power.bm_activity <<= diff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 386 | acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | if (bm_status) { |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 388 | pr->power.bm_activity |= 0x1; |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 389 | acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | } |
| 391 | /* |
| 392 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect |
| 393 | * the true state of bus mastering activity; forcing us to |
| 394 | * manually check the BMIDEA bit of each IDE channel. |
| 395 | */ |
| 396 | else if (errata.piix4.bmisx) { |
| 397 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 398 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 399 | pr->power.bm_activity |= 0x1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | pr->power.bm_check_timestamp = jiffies; |
| 403 | |
| 404 | /* |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 405 | * If bus mastering is or was active this jiffy, demote |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | * to avoid a faulty transition. Note that the processor |
| 407 | * won't enter a low-power state during this call (to this |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 408 | * function) but should upon the next. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | * |
| 410 | * TBD: A better policy might be to fallback to the demotion |
| 411 | * state (use it for this quantum only) istead of |
| 412 | * demoting -- and rely on duration as our sole demotion |
| 413 | * qualification. This may, however, introduce DMA |
| 414 | * issues (e.g. floppy DMA transfer overrun/underrun). |
| 415 | */ |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 416 | if ((pr->power.bm_activity & 0x1) && |
| 417 | cx->demotion.threshold.bm) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | local_irq_enable(); |
| 419 | next_state = cx->demotion.state; |
| 420 | goto end; |
| 421 | } |
| 422 | } |
| 423 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 424 | #ifdef CONFIG_HOTPLUG_CPU |
| 425 | /* |
| 426 | * Check for P_LVL2_UP flag before entering C2 and above on |
| 427 | * an SMP system. We do it here instead of doing it at _CST/P_LVL |
| 428 | * detection phase, to work cleanly with logical CPU hotplug. |
| 429 | */ |
| 430 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 431 | !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] | 432 | cx = &pr->power.states[ACPI_STATE_C1]; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 433 | #endif |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | /* |
| 436 | * Sleep: |
| 437 | * ------ |
| 438 | * Invoke the current Cx state to put the processor to sleep. |
| 439 | */ |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 440 | if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 441 | current_thread_info()->status &= ~TS_POLLING; |
Ingo Molnar | 0888f06 | 2006-12-22 01:11:56 -0800 | [diff] [blame] | 442 | /* |
| 443 | * TS_POLLING-cleared state must be visible before we |
| 444 | * test NEED_RESCHED: |
| 445 | */ |
| 446 | smp_mb(); |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 447 | if (need_resched()) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 448 | current_thread_info()->status |= TS_POLLING; |
Linus Torvalds | af2eb17 | 2005-12-02 23:09:06 -0800 | [diff] [blame] | 449 | local_irq_enable(); |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 450 | return; |
| 451 | } |
| 452 | } |
| 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | switch (cx->type) { |
| 455 | |
| 456 | case ACPI_STATE_C1: |
| 457 | /* |
| 458 | * Invoke C1. |
| 459 | * Use the appropriate idle routine, the one that would |
| 460 | * be used without acpi C-states. |
| 461 | */ |
| 462 | if (pm_idle_save) |
| 463 | pm_idle_save(); |
| 464 | else |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 465 | acpi_safe_halt(); |
| 466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | /* |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 468 | * TBD: Can't get time duration while in C1, as resumes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | * go to an ISR rather than here. Need to instrument |
| 470 | * base interrupt handler. |
| 471 | */ |
| 472 | sleep_ticks = 0xFFFFFFFF; |
| 473 | break; |
| 474 | |
| 475 | case ACPI_STATE_C2: |
| 476 | /* Get start time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 477 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | /* Invoke C2 */ |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 479 | acpi_state_timer_broadcast(pr, cx, 1); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 480 | acpi_cstate_enter(cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | /* Get end time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 482 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 483 | |
| 484 | #ifdef CONFIG_GENERIC_TIME |
| 485 | /* TSC halts in C2, so notify users */ |
| 486 | mark_tsc_unstable(); |
| 487 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | /* Re-enable interrupts */ |
| 489 | local_irq_enable(); |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 490 | current_thread_info()->status |= TS_POLLING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | /* Compute time (ticks) that we were actually asleep */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 492 | sleep_ticks = |
| 493 | ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 494 | acpi_state_timer_broadcast(pr, cx, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | break; |
| 496 | |
| 497 | case ACPI_STATE_C3: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 498 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 499 | if (pr->flags.bm_check) { |
| 500 | if (atomic_inc_return(&c3_cpu_count) == |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 501 | num_online_cpus()) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 502 | /* |
| 503 | * All CPUs are trying to go to C3 |
| 504 | * Disable bus master arbitration |
| 505 | */ |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 506 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 507 | } |
| 508 | } else { |
| 509 | /* SMP with no shared cache... Invalidate cache */ |
| 510 | ACPI_FLUSH_CPU_CACHE(); |
| 511 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 512 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | /* Get start time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 514 | t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | /* Invoke C3 */ |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 516 | acpi_state_timer_broadcast(pr, cx, 1); |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 517 | acpi_cstate_enter(cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | /* Get end time (ticks) */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 519 | t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 520 | if (pr->flags.bm_check) { |
| 521 | /* Enable bus master arbitration */ |
| 522 | atomic_dec(&c3_cpu_count); |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 523 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 524 | } |
| 525 | |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 526 | #ifdef CONFIG_GENERIC_TIME |
| 527 | /* TSC halts in C3, so notify users */ |
| 528 | mark_tsc_unstable(); |
| 529 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | /* Re-enable interrupts */ |
| 531 | local_irq_enable(); |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 532 | current_thread_info()->status |= TS_POLLING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | /* Compute time (ticks) that we were actually asleep */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 534 | sleep_ticks = |
| 535 | ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 536 | acpi_state_timer_broadcast(pr, cx, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | break; |
| 538 | |
| 539 | default: |
| 540 | local_irq_enable(); |
| 541 | return; |
| 542 | } |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 543 | cx->usage++; |
| 544 | if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0)) |
| 545 | cx->time += sleep_ticks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
| 547 | next_state = pr->power.state; |
| 548 | |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 549 | #ifdef CONFIG_HOTPLUG_CPU |
| 550 | /* Don't do promotion/demotion */ |
| 551 | if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 552 | !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] | 553 | next_state = cx; |
| 554 | goto end; |
| 555 | } |
| 556 | #endif |
| 557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | /* |
| 559 | * Promotion? |
| 560 | * ---------- |
| 561 | * Track the number of longs (time asleep is greater than threshold) |
| 562 | * and promote when the count threshold is reached. Note that bus |
| 563 | * mastering activity may prevent promotions. |
| 564 | * Do not promote above max_cstate. |
| 565 | */ |
| 566 | if (cx->promotion.state && |
| 567 | ((cx->promotion.state - pr->power.states) <= max_cstate)) { |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 568 | if (sleep_ticks > cx->promotion.threshold.ticks && |
| 569 | cx->promotion.state->latency <= system_latency_constraint()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | cx->promotion.count++; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 571 | cx->demotion.count = 0; |
| 572 | if (cx->promotion.count >= |
| 573 | cx->promotion.threshold.count) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | if (pr->flags.bm_check) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 575 | if (! |
| 576 | (pr->power.bm_activity & cx-> |
| 577 | promotion.threshold.bm)) { |
| 578 | next_state = |
| 579 | cx->promotion.state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | goto end; |
| 581 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 582 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | next_state = cx->promotion.state; |
| 584 | goto end; |
| 585 | } |
| 586 | } |
| 587 | } |
| 588 | } |
| 589 | |
| 590 | /* |
| 591 | * Demotion? |
| 592 | * --------- |
| 593 | * Track the number of shorts (time asleep is less than time threshold) |
| 594 | * and demote when the usage threshold is reached. |
| 595 | */ |
| 596 | if (cx->demotion.state) { |
| 597 | if (sleep_ticks < cx->demotion.threshold.ticks) { |
| 598 | cx->demotion.count++; |
| 599 | cx->promotion.count = 0; |
| 600 | if (cx->demotion.count >= cx->demotion.threshold.count) { |
| 601 | next_state = cx->demotion.state; |
| 602 | goto end; |
| 603 | } |
| 604 | } |
| 605 | } |
| 606 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 607 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | /* |
| 609 | * Demote if current state exceeds max_cstate |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 610 | * or if the latency of the current state is unacceptable |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | */ |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 612 | if ((pr->power.state - pr->power.states) > max_cstate || |
| 613 | pr->power.state->latency > system_latency_constraint()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | if (cx->demotion.state) |
| 615 | next_state = cx->demotion.state; |
| 616 | } |
| 617 | |
| 618 | /* |
| 619 | * New Cx State? |
| 620 | * ------------- |
| 621 | * If we're going to start using a new Cx state we must clean up |
| 622 | * from the previous and prepare to use the new. |
| 623 | */ |
| 624 | if (next_state != pr->power.state) |
| 625 | acpi_processor_power_activate(pr, next_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
| 627 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 628 | static int acpi_processor_set_power_policy(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | { |
| 630 | unsigned int i; |
| 631 | unsigned int state_is_set = 0; |
| 632 | struct acpi_processor_cx *lower = NULL; |
| 633 | struct acpi_processor_cx *higher = NULL; |
| 634 | struct acpi_processor_cx *cx; |
| 635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
| 637 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 638 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
| 640 | /* |
| 641 | * This function sets the default Cx state policy (OS idle handler). |
| 642 | * Our scheme is to promote quickly to C2 but more conservatively |
| 643 | * to C3. We're favoring C2 for its characteristics of low latency |
| 644 | * (quick response), good power savings, and ability to allow bus |
| 645 | * mastering activity. Note that the Cx state policy is completely |
| 646 | * customizable and can be altered dynamically. |
| 647 | */ |
| 648 | |
| 649 | /* startup state */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 650 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | cx = &pr->power.states[i]; |
| 652 | if (!cx->valid) |
| 653 | continue; |
| 654 | |
| 655 | if (!state_is_set) |
| 656 | pr->power.state = cx; |
| 657 | state_is_set++; |
| 658 | break; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 659 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
| 661 | if (!state_is_set) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 662 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
| 664 | /* demotion */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 665 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | cx = &pr->power.states[i]; |
| 667 | if (!cx->valid) |
| 668 | continue; |
| 669 | |
| 670 | if (lower) { |
| 671 | cx->demotion.state = lower; |
| 672 | cx->demotion.threshold.ticks = cx->latency_ticks; |
| 673 | cx->demotion.threshold.count = 1; |
| 674 | if (cx->type == ACPI_STATE_C3) |
| 675 | cx->demotion.threshold.bm = bm_history; |
| 676 | } |
| 677 | |
| 678 | lower = cx; |
| 679 | } |
| 680 | |
| 681 | /* promotion */ |
| 682 | for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) { |
| 683 | cx = &pr->power.states[i]; |
| 684 | if (!cx->valid) |
| 685 | continue; |
| 686 | |
| 687 | if (higher) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 688 | cx->promotion.state = higher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | cx->promotion.threshold.ticks = cx->latency_ticks; |
| 690 | if (cx->type >= ACPI_STATE_C2) |
| 691 | cx->promotion.threshold.count = 4; |
| 692 | else |
| 693 | cx->promotion.threshold.count = 10; |
| 694 | if (higher->type == ACPI_STATE_C3) |
| 695 | cx->promotion.threshold.bm = bm_history; |
| 696 | } |
| 697 | |
| 698 | higher = cx; |
| 699 | } |
| 700 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 701 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | } |
| 703 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 704 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
| 707 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 708 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
| 710 | if (!pr->pblk) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 711 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | /* if info is obtained from pblk/fadt, type equals state */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
| 715 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; |
| 716 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 717 | #ifndef CONFIG_HOTPLUG_CPU |
| 718 | /* |
| 719 | * Check for P_LVL2_UP flag before entering C2 and above on |
| 720 | * an SMP system. |
| 721 | */ |
Alexey Starikovskiy | ad71860a | 2007-02-02 19:48:19 +0300 | [diff] [blame] | 722 | if ((num_online_cpus() > 1) && |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 723 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 724 | return -ENODEV; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 725 | #endif |
| 726 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | /* determine C2 and C3 address from pblk */ |
| 728 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; |
| 729 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; |
| 730 | |
| 731 | /* determine latencies from FADT */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 732 | pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency; |
| 733 | pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
| 735 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 736 | "lvl2[0x%08x] lvl3[0x%08x]\n", |
| 737 | pr->power.states[ACPI_STATE_C2].address, |
| 738 | pr->power.states[ACPI_STATE_C3].address)); |
| 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 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 743 | static int acpi_processor_get_power_info_default(struct acpi_processor *pr) |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 744 | { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 745 | if (!pr->power.states[ACPI_STATE_C1].valid) { |
| 746 | /* set the first C-State to C1 */ |
| 747 | /* all processors need to support C1 */ |
| 748 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; |
| 749 | pr->power.states[ACPI_STATE_C1].valid = 1; |
| 750 | } |
| 751 | /* the C0 state only exists as a filler in our array */ |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 752 | pr->power.states[ACPI_STATE_C0].valid = 1; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 753 | return 0; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 754 | } |
| 755 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 756 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 758 | acpi_status status = 0; |
| 759 | acpi_integer count; |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 760 | int current_count; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 761 | int i; |
| 762 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 763 | union acpi_object *cst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | if (nocst) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 767 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 769 | current_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
| 771 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); |
| 772 | if (ACPI_FAILURE(status)) { |
| 773 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 774 | return -ENODEV; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 775 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 777 | cst = buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | |
| 779 | /* There must be at least 2 elements */ |
| 780 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 781 | printk(KERN_ERR PREFIX "not enough elements in _CST\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | status = -EFAULT; |
| 783 | goto end; |
| 784 | } |
| 785 | |
| 786 | count = cst->package.elements[0].integer.value; |
| 787 | |
| 788 | /* Validate number of power states. */ |
| 789 | if (count < 1 || count != cst->package.count - 1) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 790 | printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | status = -EFAULT; |
| 792 | goto end; |
| 793 | } |
| 794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | /* Tell driver that at least _CST is supported. */ |
| 796 | pr->flags.has_cst = 1; |
| 797 | |
| 798 | for (i = 1; i <= count; i++) { |
| 799 | union acpi_object *element; |
| 800 | union acpi_object *obj; |
| 801 | struct acpi_power_register *reg; |
| 802 | struct acpi_processor_cx cx; |
| 803 | |
| 804 | memset(&cx, 0, sizeof(cx)); |
| 805 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 806 | element = &(cst->package.elements[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | if (element->type != ACPI_TYPE_PACKAGE) |
| 808 | continue; |
| 809 | |
| 810 | if (element->package.count != 4) |
| 811 | continue; |
| 812 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 813 | obj = &(element->package.elements[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | |
| 815 | if (obj->type != ACPI_TYPE_BUFFER) |
| 816 | continue; |
| 817 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 818 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
| 820 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 821 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | continue; |
| 823 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | /* There should be an easy way to extract an integer... */ |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 825 | obj = &(element->package.elements[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | if (obj->type != ACPI_TYPE_INTEGER) |
| 827 | continue; |
| 828 | |
| 829 | cx.type = obj->integer.value; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 830 | /* |
| 831 | * Some buggy BIOSes won't list C1 in _CST - |
| 832 | * Let acpi_processor_get_power_info_default() handle them later |
| 833 | */ |
| 834 | if (i == 1 && cx.type != ACPI_STATE_C1) |
| 835 | current_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 837 | cx.address = reg->address; |
| 838 | cx.index = current_count + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 840 | cx.space_id = ACPI_CSTATE_SYSTEMIO; |
| 841 | if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { |
| 842 | if (acpi_processor_ffh_cstate_probe |
| 843 | (pr->id, &cx, reg) == 0) { |
| 844 | cx.space_id = ACPI_CSTATE_FFH; |
| 845 | } else if (cx.type != ACPI_STATE_C1) { |
| 846 | /* |
| 847 | * C1 is a special case where FIXED_HARDWARE |
| 848 | * can be handled in non-MWAIT way as well. |
| 849 | * In that case, save this _CST entry info. |
| 850 | * That is, we retain space_id of SYSTEM_IO for |
| 851 | * halt based C1. |
| 852 | * Otherwise, ignore this info and continue. |
| 853 | */ |
| 854 | continue; |
| 855 | } |
| 856 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 858 | obj = &(element->package.elements[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | if (obj->type != ACPI_TYPE_INTEGER) |
| 860 | continue; |
| 861 | |
| 862 | cx.latency = obj->integer.value; |
| 863 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 864 | obj = &(element->package.elements[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | if (obj->type != ACPI_TYPE_INTEGER) |
| 866 | continue; |
| 867 | |
| 868 | cx.power = obj->integer.value; |
| 869 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 870 | current_count++; |
| 871 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); |
| 872 | |
| 873 | /* |
| 874 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 |
| 875 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) |
| 876 | */ |
| 877 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { |
| 878 | printk(KERN_WARNING |
| 879 | "Limiting number of power states to max (%d)\n", |
| 880 | ACPI_PROCESSOR_MAX_POWER); |
| 881 | printk(KERN_WARNING |
| 882 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); |
| 883 | break; |
| 884 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | } |
| 886 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 887 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 888 | current_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
| 890 | /* Validate number of power states discovered */ |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 891 | if (current_count < 2) |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 892 | status = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 894 | end: |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 895 | kfree(buffer.pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 897 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | } |
| 899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) |
| 901 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | |
| 903 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 904 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | |
| 906 | /* |
| 907 | * C2 latency must be less than or equal to 100 |
| 908 | * microseconds. |
| 909 | */ |
| 910 | else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { |
| 911 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 912 | "latency too large [%d]\n", cx->latency)); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 913 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | } |
| 915 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | /* |
| 917 | * Otherwise we've met all of our C2 requirements. |
| 918 | * Normalize the C2 latency to expidite policy |
| 919 | */ |
| 920 | cx->valid = 1; |
| 921 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
| 922 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 923 | return; |
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 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
| 927 | struct acpi_processor_cx *cx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 929 | static int bm_check_flag; |
| 930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | |
| 932 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 933 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | |
| 935 | /* |
| 936 | * C3 latency must be less than or equal to 1000 |
| 937 | * microseconds. |
| 938 | */ |
| 939 | else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { |
| 940 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 941 | "latency too large [%d]\n", cx->latency)); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 942 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | } |
| 944 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | /* |
| 946 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) |
| 947 | * DMA transfers are used by any ISA device to avoid livelock. |
| 948 | * Note that we could disable Type-F DMA (as recommended by |
| 949 | * the erratum), but this is known to disrupt certain ISA |
| 950 | * devices thus we take the conservative approach. |
| 951 | */ |
| 952 | else if (errata.piix4.fdma) { |
| 953 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 954 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 955 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | } |
| 957 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 958 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
| 959 | if (!bm_check_flag) { |
| 960 | /* Determine whether bm_check is needed based on CPU */ |
| 961 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); |
| 962 | bm_check_flag = pr->flags.bm_check; |
| 963 | } else { |
| 964 | pr->flags.bm_check = bm_check_flag; |
| 965 | } |
| 966 | |
| 967 | if (pr->flags.bm_check) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 968 | /* bus mastering control is necessary */ |
| 969 | if (!pr->flags.bm_control) { |
| 970 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 971 | "C3 support requires bus mastering control\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 972 | return; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 973 | } |
| 974 | } else { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 975 | /* |
| 976 | * WBINVD should be set in fadt, for C3 state to be |
| 977 | * supported on when bm_check is not required. |
| 978 | */ |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 979 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 980 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 981 | "Cache invalidation should work properly" |
| 982 | " for C3 to be enabled on SMP systems\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 983 | return; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 984 | } |
Bob Moore | d8c71b6 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 985 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 986 | } |
| 987 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | /* |
| 989 | * Otherwise we've met all of our C3 requirements. |
| 990 | * Normalize the C3 latency to expidite policy. Enable |
| 991 | * checking of bus mastering status (bm_check) so we can |
| 992 | * use this in our C3 policy |
| 993 | */ |
| 994 | cx->valid = 1; |
| 995 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 997 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | } |
| 999 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
| 1001 | { |
| 1002 | unsigned int i; |
| 1003 | unsigned int working = 0; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 1004 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1005 | pr->power.timer_broadcast_on_state = INT_MAX; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 1006 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1007 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
| 1009 | |
| 1010 | switch (cx->type) { |
| 1011 | case ACPI_STATE_C1: |
| 1012 | cx->valid = 1; |
| 1013 | break; |
| 1014 | |
| 1015 | case ACPI_STATE_C2: |
| 1016 | acpi_processor_power_verify_c2(cx); |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 1017 | if (cx->valid) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1018 | acpi_timer_check_state(i, pr, cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | break; |
| 1020 | |
| 1021 | case ACPI_STATE_C3: |
| 1022 | acpi_processor_power_verify_c3(pr, cx); |
Linus Torvalds | 296d93c | 2007-03-23 08:03:47 -0700 | [diff] [blame] | 1023 | if (cx->valid) |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1024 | acpi_timer_check_state(i, pr, cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | break; |
| 1026 | } |
| 1027 | |
| 1028 | if (cx->valid) |
| 1029 | working++; |
| 1030 | } |
| 1031 | |
Thomas Gleixner | 169a0ab | 2007-02-16 01:27:55 -0800 | [diff] [blame] | 1032 | acpi_propagate_timer_broadcast(pr); |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 1033 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | return (working); |
| 1035 | } |
| 1036 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1037 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | { |
| 1039 | unsigned int i; |
| 1040 | int result; |
| 1041 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | |
| 1043 | /* NOTE: the idle thread may not be running while calling |
| 1044 | * this function */ |
| 1045 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 1046 | /* Zero initialize all the C-states info. */ |
| 1047 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
| 1048 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | result = acpi_processor_get_power_info_cst(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 1050 | if (result == -ENODEV) |
Darrick J. Wong | c5a114f | 2006-10-19 23:28:28 -0700 | [diff] [blame] | 1051 | result = acpi_processor_get_power_info_fadt(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 1052 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 1053 | if (result) |
| 1054 | return result; |
| 1055 | |
| 1056 | acpi_processor_get_power_info_default(pr); |
| 1057 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 1058 | pr->power.count = acpi_processor_power_verify(pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | |
| 1060 | /* |
| 1061 | * Set Default Policy |
| 1062 | * ------------------ |
| 1063 | * Now that we know which states are supported, set the default |
| 1064 | * policy. Note that this policy can be changed dynamically |
| 1065 | * (e.g. encourage deeper sleeps to conserve battery life when |
| 1066 | * not on AC). |
| 1067 | */ |
| 1068 | result = acpi_processor_set_power_policy(pr); |
| 1069 | if (result) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1070 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | |
| 1072 | /* |
| 1073 | * if one state of type C2 or C3 is available, mark this |
| 1074 | * CPU as being "idle manageable" |
| 1075 | */ |
| 1076 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 1077 | if (pr->power.states[i].valid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | pr->power.count = i; |
Linus Torvalds | 2203d6e | 2005-11-18 07:29:51 -0800 | [diff] [blame] | 1079 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
| 1080 | pr->flags.power = 1; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 1081 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | } |
| 1083 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1084 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | } |
| 1086 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1087 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1089 | int result = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | |
| 1092 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1093 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1095 | if (nocst) { |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1096 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | } |
| 1098 | |
| 1099 | if (!pr->flags.power_setup_done) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1100 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | |
| 1102 | /* Fall back to the default idle loop */ |
| 1103 | pm_idle = pm_idle_save; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1104 | synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | |
| 1106 | pr->flags.power = 0; |
| 1107 | result = acpi_processor_get_power_info(pr); |
| 1108 | if ((pr->flags.power == 1) && (pr->flags.power_setup_done)) |
| 1109 | pm_idle = acpi_processor_idle; |
| 1110 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1111 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | } |
| 1113 | |
| 1114 | /* proc interface */ |
| 1115 | |
| 1116 | static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) |
| 1117 | { |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 1118 | struct acpi_processor *pr = seq->private; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1119 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | |
| 1122 | if (!pr) |
| 1123 | goto end; |
| 1124 | |
| 1125 | seq_printf(seq, "active state: C%zd\n" |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1126 | "max_cstate: C%d\n" |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1127 | "bus master activity: %08x\n" |
| 1128 | "maximum allowed latency: %d usec\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1129 | pr->power.state ? pr->power.state - pr->power.states : 0, |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1130 | max_cstate, (unsigned)pr->power.bm_activity, |
| 1131 | system_latency_constraint()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | |
| 1133 | seq_puts(seq, "states:\n"); |
| 1134 | |
| 1135 | for (i = 1; i <= pr->power.count; i++) { |
| 1136 | seq_printf(seq, " %cC%d: ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1137 | (&pr->power.states[i] == |
| 1138 | pr->power.state ? '*' : ' '), i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | |
| 1140 | if (!pr->power.states[i].valid) { |
| 1141 | seq_puts(seq, "<not supported>\n"); |
| 1142 | continue; |
| 1143 | } |
| 1144 | |
| 1145 | switch (pr->power.states[i].type) { |
| 1146 | case ACPI_STATE_C1: |
| 1147 | seq_printf(seq, "type[C1] "); |
| 1148 | break; |
| 1149 | case ACPI_STATE_C2: |
| 1150 | seq_printf(seq, "type[C2] "); |
| 1151 | break; |
| 1152 | case ACPI_STATE_C3: |
| 1153 | seq_printf(seq, "type[C3] "); |
| 1154 | break; |
| 1155 | default: |
| 1156 | seq_printf(seq, "type[--] "); |
| 1157 | break; |
| 1158 | } |
| 1159 | |
| 1160 | if (pr->power.states[i].promotion.state) |
| 1161 | seq_printf(seq, "promotion[C%zd] ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1162 | (pr->power.states[i].promotion.state - |
| 1163 | pr->power.states)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | else |
| 1165 | seq_puts(seq, "promotion[--] "); |
| 1166 | |
| 1167 | if (pr->power.states[i].demotion.state) |
| 1168 | seq_printf(seq, "demotion[C%zd] ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1169 | (pr->power.states[i].demotion.state - |
| 1170 | pr->power.states)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | else |
| 1172 | seq_puts(seq, "demotion[--] "); |
| 1173 | |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 1174 | seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1175 | pr->power.states[i].latency, |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 1176 | pr->power.states[i].usage, |
Alexey Starikovskiy | b0b7eaa | 2007-01-25 22:39:44 -0500 | [diff] [blame] | 1177 | (unsigned long long)pr->power.states[i].time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | } |
| 1179 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1180 | end: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1181 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | } |
| 1183 | |
| 1184 | static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) |
| 1185 | { |
| 1186 | return single_open(file, acpi_processor_power_seq_show, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1187 | PDE(inode)->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | } |
| 1189 | |
Arjan van de Ven | d750803 | 2006-07-04 13:06:00 -0400 | [diff] [blame] | 1190 | static const struct file_operations acpi_processor_power_fops = { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1191 | .open = acpi_processor_power_open_fs, |
| 1192 | .read = seq_read, |
| 1193 | .llseek = seq_lseek, |
| 1194 | .release = single_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | }; |
| 1196 | |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1197 | #ifdef CONFIG_SMP |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1198 | static void smp_callback(void *v) |
| 1199 | { |
| 1200 | /* we already woke the CPU up, nothing more to do */ |
| 1201 | } |
| 1202 | |
| 1203 | /* |
| 1204 | * This function gets called when a part of the kernel has a new latency |
| 1205 | * requirement. This means we need to get all processors out of their C-state, |
| 1206 | * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that |
| 1207 | * wakes them all right up. |
| 1208 | */ |
| 1209 | static int acpi_processor_latency_notify(struct notifier_block *b, |
| 1210 | unsigned long l, void *v) |
| 1211 | { |
| 1212 | smp_call_function(smp_callback, NULL, 0, 1); |
| 1213 | return NOTIFY_OK; |
| 1214 | } |
| 1215 | |
| 1216 | static struct notifier_block acpi_processor_latency_notifier = { |
| 1217 | .notifier_call = acpi_processor_latency_notify, |
| 1218 | }; |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1219 | #endif |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1220 | |
Pierre Ossman | 7af8b66 | 2006-10-10 14:20:31 -0700 | [diff] [blame] | 1221 | int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1222 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1224 | acpi_status status = 0; |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 1225 | static int first_run; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1226 | struct proc_dir_entry *entry = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | unsigned int i; |
| 1228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | |
| 1230 | if (!first_run) { |
| 1231 | dmi_check_system(processor_power_dmi_table); |
| 1232 | if (max_cstate < ACPI_C_STATES_MAX) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1233 | printk(KERN_NOTICE |
| 1234 | "ACPI: processor limited to max C-state %d\n", |
| 1235 | max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | first_run++; |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1237 | #ifdef CONFIG_SMP |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1238 | register_latency_notifier(&acpi_processor_latency_notifier); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1239 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | } |
| 1241 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1242 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1243 | return -EINVAL; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1244 | |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1245 | if (acpi_gbl_FADT.cst_control && !nocst) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1246 | status = |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 1247 | 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] | 1248 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1249 | ACPI_EXCEPTION((AE_INFO, status, |
| 1250 | "Notifying BIOS of _CST ability failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | } |
| 1252 | } |
| 1253 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | acpi_processor_get_power_info(pr); |
| 1255 | |
| 1256 | /* |
| 1257 | * Install the idle handler if processor power management is supported. |
| 1258 | * Note that we use previously set idle handler will be used on |
| 1259 | * platforms that only support C1. |
| 1260 | */ |
| 1261 | if ((pr->flags.power) && (!boot_option_idle_override)) { |
| 1262 | printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); |
| 1263 | for (i = 1; i <= pr->power.count; i++) |
| 1264 | if (pr->power.states[i].valid) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1265 | printk(" C%d[C%d]", i, |
| 1266 | pr->power.states[i].type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | printk(")\n"); |
| 1268 | |
| 1269 | if (pr->id == 0) { |
| 1270 | pm_idle_save = pm_idle; |
| 1271 | pm_idle = acpi_processor_idle; |
| 1272 | } |
| 1273 | } |
| 1274 | |
| 1275 | /* 'power' [R] */ |
| 1276 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1277 | S_IRUGO, acpi_device_dir(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | if (!entry) |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1279 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | else { |
| 1281 | entry->proc_fops = &acpi_processor_power_fops; |
| 1282 | entry->data = acpi_driver_data(device); |
| 1283 | entry->owner = THIS_MODULE; |
| 1284 | } |
| 1285 | |
| 1286 | pr->flags.power_setup_done = 1; |
| 1287 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1288 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | } |
| 1290 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1291 | int acpi_processor_power_exit(struct acpi_processor *pr, |
| 1292 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | |
| 1295 | pr->flags.power_setup_done = 0; |
| 1296 | |
| 1297 | if (acpi_device_dir(device)) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1298 | remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
| 1299 | acpi_device_dir(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | |
| 1301 | /* Unregister the idle handler when processor #0 is removed. */ |
| 1302 | if (pr->id == 0) { |
| 1303 | pm_idle = pm_idle_save; |
| 1304 | |
| 1305 | /* |
| 1306 | * We are about to unload the current idle thread pm callback |
| 1307 | * (pm_idle), Wait for all processors to update cached/local |
| 1308 | * copies of pm_idle before proceeding. |
| 1309 | */ |
| 1310 | cpu_idle_wait(); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1311 | #ifdef CONFIG_SMP |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1312 | unregister_latency_notifier(&acpi_processor_latency_notifier); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1313 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | } |
| 1315 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1316 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | } |