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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | #include <asm/io.h> |
| 44 | #include <asm/uaccess.h> |
| 45 | |
| 46 | #include <acpi/acpi_bus.h> |
| 47 | #include <acpi/processor.h> |
| 48 | |
| 49 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 |
| 50 | #define ACPI_PROCESSOR_CLASS "processor" |
| 51 | #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" |
| 52 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 53 | ACPI_MODULE_NAME("acpi_processor") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #define ACPI_PROCESSOR_FILE_POWER "power" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000) |
| 56 | #define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */ |
| 57 | #define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */ |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 58 | static void (*pm_idle_save) (void) __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | module_param(max_cstate, uint, 0644); |
| 60 | |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 61 | static unsigned int nocst __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | module_param(nocst, uint, 0000); |
| 63 | |
| 64 | /* |
| 65 | * bm_history -- bit-mask with a bit per jiffy of bus-master activity |
| 66 | * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms |
| 67 | * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms |
| 68 | * 100 HZ: 0x0000000F: 4 jiffies = 40ms |
| 69 | * reduce history for more aggressive entry into C3 |
| 70 | */ |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 71 | static unsigned int bm_history __read_mostly = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 72 | (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | module_param(bm_history, uint, 0644); |
| 74 | /* -------------------------------------------------------------------------- |
| 75 | Power Management |
| 76 | -------------------------------------------------------------------------- */ |
| 77 | |
| 78 | /* |
| 79 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. |
| 80 | * For now disable this. Probably a bug somewhere else. |
| 81 | * |
| 82 | * To skip this limit, boot/load with a large max_cstate limit. |
| 83 | */ |
David Shaohua Li | 335f16b | 2005-06-22 18:37:00 -0400 | [diff] [blame] | 84 | static int set_max_cstate(struct dmi_system_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | { |
| 86 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) |
| 87 | return 0; |
| 88 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 89 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 90 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
| 91 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 93 | max_cstate = (long)id->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
Ashok Raj | 7ded568 | 2006-02-03 21:51:23 +0100 | [diff] [blame] | 98 | /* Actually this shouldn't be __cpuinitdata, would be better to fix the |
| 99 | callers to only run once -AK */ |
| 100 | static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 101 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 102 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
Bartlomiej Swiercz | f831335 | 2006-05-29 07:16:00 -0400 | [diff] [blame] | 103 | DMI_MATCH(DMI_BIOS_VERSION,"1SET70WW")}, (void *)1}, |
| 104 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 105 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 106 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1}, |
| 107 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 108 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 109 | DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1}, |
| 110 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 111 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 112 | DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1}, |
| 113 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 114 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 115 | DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1}, |
| 116 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 117 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 118 | DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1}, |
| 119 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 120 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 121 | DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1}, |
| 122 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 123 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 124 | DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1}, |
| 125 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 126 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 127 | DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1}, |
| 128 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 129 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 130 | DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1}, |
| 131 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 132 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 133 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1}, |
| 134 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 135 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 136 | DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1}, |
| 137 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 138 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 139 | DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1}, |
| 140 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 141 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 142 | DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1}, |
| 143 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 144 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 145 | DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1}, |
| 146 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 147 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 148 | DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1}, |
| 149 | { set_max_cstate, "Medion 41700", { |
| 150 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 151 | DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1}, |
| 152 | { set_max_cstate, "Clevo 5600D", { |
| 153 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 154 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 155 | (void *)2}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | {}, |
| 157 | }; |
| 158 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 159 | static inline u32 ticks_elapsed(u32 t1, u32 t2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | { |
| 161 | if (t2 >= t1) |
| 162 | return (t2 - t1); |
| 163 | else if (!acpi_fadt.tmr_val_ext) |
| 164 | return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); |
| 165 | else |
| 166 | return ((0xFFFFFFFF - t1) + t2); |
| 167 | } |
| 168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | static void |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 170 | acpi_processor_power_activate(struct acpi_processor *pr, |
| 171 | struct acpi_processor_cx *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 173 | struct acpi_processor_cx *old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
| 175 | if (!pr || !new) |
| 176 | return; |
| 177 | |
| 178 | old = pr->power.state; |
| 179 | |
| 180 | if (old) |
| 181 | old->promotion.count = 0; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 182 | new->demotion.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
| 184 | /* Cleanup from old state. */ |
| 185 | if (old) { |
| 186 | switch (old->type) { |
| 187 | case ACPI_STATE_C3: |
| 188 | /* Disable bus master reload */ |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 189 | if (new->type != ACPI_STATE_C3 && pr->flags.bm_check) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 190 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0, |
| 191 | ACPI_MTX_DO_NOT_LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | break; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | /* Prepare to use new state. */ |
| 197 | switch (new->type) { |
| 198 | case ACPI_STATE_C3: |
| 199 | /* Enable bus master reload */ |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 200 | if (old->type != ACPI_STATE_C3 && pr->flags.bm_check) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 201 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1, |
| 202 | ACPI_MTX_DO_NOT_LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | break; |
| 204 | } |
| 205 | |
| 206 | pr->power.state = new; |
| 207 | |
| 208 | return; |
| 209 | } |
| 210 | |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 211 | static void acpi_safe_halt(void) |
| 212 | { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 213 | current_thread_info()->status &= ~TS_POLLING; |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 214 | smp_mb__after_clear_bit(); |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 215 | if (!need_resched()) |
| 216 | safe_halt(); |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 217 | current_thread_info()->status |= TS_POLLING; |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 218 | } |
| 219 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 220 | static atomic_t c3_cpu_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 222 | /* Common C-state entry for C2, C3, .. */ |
| 223 | static void acpi_cstate_enter(struct acpi_processor_cx *cstate) |
| 224 | { |
| 225 | if (cstate->space_id == ACPI_CSTATE_FFH) { |
| 226 | /* Call into architectural FFH based C-state */ |
| 227 | acpi_processor_ffh_cstate_enter(cstate); |
| 228 | } else { |
| 229 | int unused; |
| 230 | /* IO port based C-state */ |
| 231 | inb(cstate->address); |
| 232 | /* Dummy wait op - must do something useless after P_LVL2 read |
| 233 | because chipsets cannot guarantee that STPCLK# signal |
| 234 | gets asserted in time to freeze execution properly. */ |
| 235 | unused = inl(acpi_fadt.xpm_tmr_blk.address); |
| 236 | } |
| 237 | } |
| 238 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 239 | static void acpi_processor_idle(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 241 | struct acpi_processor *pr = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | struct acpi_processor_cx *cx = NULL; |
| 243 | struct acpi_processor_cx *next_state = NULL; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 244 | int sleep_ticks = 0; |
| 245 | u32 t1, t2 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 247 | pr = processors[smp_processor_id()]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | if (!pr) |
| 249 | return; |
| 250 | |
| 251 | /* |
| 252 | * Interrupts must be disabled during bus mastering calculations and |
| 253 | * for C2/C3 transitions. |
| 254 | */ |
| 255 | local_irq_disable(); |
| 256 | |
| 257 | /* |
| 258 | * Check whether we truly need to go idle, or should |
| 259 | * reschedule: |
| 260 | */ |
| 261 | if (unlikely(need_resched())) { |
| 262 | local_irq_enable(); |
| 263 | return; |
| 264 | } |
| 265 | |
| 266 | cx = pr->power.state; |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 267 | if (!cx) { |
| 268 | if (pm_idle_save) |
| 269 | pm_idle_save(); |
| 270 | else |
| 271 | acpi_safe_halt(); |
| 272 | return; |
| 273 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
| 275 | /* |
| 276 | * Check BM Activity |
| 277 | * ----------------- |
| 278 | * Check for bus mastering activity (if required), record, and check |
| 279 | * for demotion. |
| 280 | */ |
| 281 | if (pr->flags.bm_check) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 282 | u32 bm_status = 0; |
| 283 | unsigned long diff = jiffies - pr->power.bm_check_timestamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 285 | if (diff > 31) |
| 286 | diff = 31; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 288 | pr->power.bm_activity <<= diff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
| 290 | acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 291 | &bm_status, ACPI_MTX_DO_NOT_LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | if (bm_status) { |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 293 | pr->power.bm_activity |= 0x1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 295 | 1, ACPI_MTX_DO_NOT_LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | } |
| 297 | /* |
| 298 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect |
| 299 | * the true state of bus mastering activity; forcing us to |
| 300 | * manually check the BMIDEA bit of each IDE channel. |
| 301 | */ |
| 302 | else if (errata.piix4.bmisx) { |
| 303 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 304 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
Dominik Brodowski | c5ab81c | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 305 | pr->power.bm_activity |= 0x1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | pr->power.bm_check_timestamp = jiffies; |
| 309 | |
| 310 | /* |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 311 | * If bus mastering is or was active this jiffy, demote |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | * to avoid a faulty transition. Note that the processor |
| 313 | * won't enter a low-power state during this call (to this |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 314 | * function) but should upon the next. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | * |
| 316 | * TBD: A better policy might be to fallback to the demotion |
| 317 | * state (use it for this quantum only) istead of |
| 318 | * demoting -- and rely on duration as our sole demotion |
| 319 | * qualification. This may, however, introduce DMA |
| 320 | * issues (e.g. floppy DMA transfer overrun/underrun). |
| 321 | */ |
Dominik Brodowski | c4a001b | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 322 | if ((pr->power.bm_activity & 0x1) && |
| 323 | cx->demotion.threshold.bm) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | local_irq_enable(); |
| 325 | next_state = cx->demotion.state; |
| 326 | goto end; |
| 327 | } |
| 328 | } |
| 329 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 330 | #ifdef CONFIG_HOTPLUG_CPU |
| 331 | /* |
| 332 | * Check for P_LVL2_UP flag before entering C2 and above on |
| 333 | * an SMP system. We do it here instead of doing it at _CST/P_LVL |
| 334 | * detection phase, to work cleanly with logical CPU hotplug. |
| 335 | */ |
| 336 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 337 | !pr->flags.has_cst && !acpi_fadt.plvl2_up) |
| 338 | cx = &pr->power.states[ACPI_STATE_C1]; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 339 | #endif |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | /* |
| 342 | * Sleep: |
| 343 | * ------ |
| 344 | * Invoke the current Cx state to put the processor to sleep. |
| 345 | */ |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 346 | if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 347 | current_thread_info()->status &= ~TS_POLLING; |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 348 | smp_mb__after_clear_bit(); |
| 349 | if (need_resched()) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 350 | current_thread_info()->status |= TS_POLLING; |
Linus Torvalds | af2eb17 | 2005-12-02 23:09:06 -0800 | [diff] [blame] | 351 | local_irq_enable(); |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 352 | return; |
| 353 | } |
| 354 | } |
| 355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | switch (cx->type) { |
| 357 | |
| 358 | case ACPI_STATE_C1: |
| 359 | /* |
| 360 | * Invoke C1. |
| 361 | * Use the appropriate idle routine, the one that would |
| 362 | * be used without acpi C-states. |
| 363 | */ |
| 364 | if (pm_idle_save) |
| 365 | pm_idle_save(); |
| 366 | else |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 367 | acpi_safe_halt(); |
| 368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | /* |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 370 | * TBD: Can't get time duration while in C1, as resumes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | * go to an ISR rather than here. Need to instrument |
| 372 | * base interrupt handler. |
| 373 | */ |
| 374 | sleep_ticks = 0xFFFFFFFF; |
| 375 | break; |
| 376 | |
| 377 | case ACPI_STATE_C2: |
| 378 | /* Get start time (ticks) */ |
| 379 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); |
| 380 | /* Invoke C2 */ |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 381 | acpi_cstate_enter(cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | /* Get end time (ticks) */ |
| 383 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 384 | |
| 385 | #ifdef CONFIG_GENERIC_TIME |
| 386 | /* TSC halts in C2, so notify users */ |
| 387 | mark_tsc_unstable(); |
| 388 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | /* Re-enable interrupts */ |
| 390 | local_irq_enable(); |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 391 | current_thread_info()->status |= TS_POLLING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | /* Compute time (ticks) that we were actually asleep */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 393 | sleep_ticks = |
| 394 | ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | break; |
| 396 | |
| 397 | case ACPI_STATE_C3: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 398 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 399 | if (pr->flags.bm_check) { |
| 400 | if (atomic_inc_return(&c3_cpu_count) == |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 401 | num_online_cpus()) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 402 | /* |
| 403 | * All CPUs are trying to go to C3 |
| 404 | * Disable bus master arbitration |
| 405 | */ |
| 406 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 407 | ACPI_MTX_DO_NOT_LOCK); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 408 | } |
| 409 | } else { |
| 410 | /* SMP with no shared cache... Invalidate cache */ |
| 411 | ACPI_FLUSH_CPU_CACHE(); |
| 412 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 413 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | /* Get start time (ticks) */ |
| 415 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); |
| 416 | /* Invoke C3 */ |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 417 | acpi_cstate_enter(cx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | /* Get end time (ticks) */ |
| 419 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 420 | if (pr->flags.bm_check) { |
| 421 | /* Enable bus master arbitration */ |
| 422 | atomic_dec(&c3_cpu_count); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 423 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, |
| 424 | ACPI_MTX_DO_NOT_LOCK); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 425 | } |
| 426 | |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 427 | #ifdef CONFIG_GENERIC_TIME |
| 428 | /* TSC halts in C3, so notify users */ |
| 429 | mark_tsc_unstable(); |
| 430 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | /* Re-enable interrupts */ |
| 432 | local_irq_enable(); |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 433 | current_thread_info()->status |= TS_POLLING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | /* Compute time (ticks) that we were actually asleep */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 435 | sleep_ticks = |
| 436 | ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | break; |
| 438 | |
| 439 | default: |
| 440 | local_irq_enable(); |
| 441 | return; |
| 442 | } |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 443 | cx->usage++; |
| 444 | if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0)) |
| 445 | cx->time += sleep_ticks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | next_state = pr->power.state; |
| 448 | |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 449 | #ifdef CONFIG_HOTPLUG_CPU |
| 450 | /* Don't do promotion/demotion */ |
| 451 | if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) && |
| 452 | !pr->flags.has_cst && !acpi_fadt.plvl2_up) { |
| 453 | next_state = cx; |
| 454 | goto end; |
| 455 | } |
| 456 | #endif |
| 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | /* |
| 459 | * Promotion? |
| 460 | * ---------- |
| 461 | * Track the number of longs (time asleep is greater than threshold) |
| 462 | * and promote when the count threshold is reached. Note that bus |
| 463 | * mastering activity may prevent promotions. |
| 464 | * Do not promote above max_cstate. |
| 465 | */ |
| 466 | if (cx->promotion.state && |
| 467 | ((cx->promotion.state - pr->power.states) <= max_cstate)) { |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 468 | if (sleep_ticks > cx->promotion.threshold.ticks && |
| 469 | cx->promotion.state->latency <= system_latency_constraint()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | cx->promotion.count++; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 471 | cx->demotion.count = 0; |
| 472 | if (cx->promotion.count >= |
| 473 | cx->promotion.threshold.count) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | if (pr->flags.bm_check) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 475 | if (! |
| 476 | (pr->power.bm_activity & cx-> |
| 477 | promotion.threshold.bm)) { |
| 478 | next_state = |
| 479 | cx->promotion.state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | goto end; |
| 481 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 482 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | next_state = cx->promotion.state; |
| 484 | goto end; |
| 485 | } |
| 486 | } |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | /* |
| 491 | * Demotion? |
| 492 | * --------- |
| 493 | * Track the number of shorts (time asleep is less than time threshold) |
| 494 | * and demote when the usage threshold is reached. |
| 495 | */ |
| 496 | if (cx->demotion.state) { |
| 497 | if (sleep_ticks < cx->demotion.threshold.ticks) { |
| 498 | cx->demotion.count++; |
| 499 | cx->promotion.count = 0; |
| 500 | if (cx->demotion.count >= cx->demotion.threshold.count) { |
| 501 | next_state = cx->demotion.state; |
| 502 | goto end; |
| 503 | } |
| 504 | } |
| 505 | } |
| 506 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 507 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | /* |
| 509 | * Demote if current state exceeds max_cstate |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 510 | * or if the latency of the current state is unacceptable |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | */ |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 512 | if ((pr->power.state - pr->power.states) > max_cstate || |
| 513 | pr->power.state->latency > system_latency_constraint()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | if (cx->demotion.state) |
| 515 | next_state = cx->demotion.state; |
| 516 | } |
| 517 | |
| 518 | /* |
| 519 | * New Cx State? |
| 520 | * ------------- |
| 521 | * If we're going to start using a new Cx state we must clean up |
| 522 | * from the previous and prepare to use the new. |
| 523 | */ |
| 524 | if (next_state != pr->power.state) |
| 525 | acpi_processor_power_activate(pr, next_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | } |
| 527 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 528 | static int acpi_processor_set_power_policy(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | { |
| 530 | unsigned int i; |
| 531 | unsigned int state_is_set = 0; |
| 532 | struct acpi_processor_cx *lower = NULL; |
| 533 | struct acpi_processor_cx *higher = NULL; |
| 534 | struct acpi_processor_cx *cx; |
| 535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
| 537 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 538 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
| 540 | /* |
| 541 | * This function sets the default Cx state policy (OS idle handler). |
| 542 | * Our scheme is to promote quickly to C2 but more conservatively |
| 543 | * to C3. We're favoring C2 for its characteristics of low latency |
| 544 | * (quick response), good power savings, and ability to allow bus |
| 545 | * mastering activity. Note that the Cx state policy is completely |
| 546 | * customizable and can be altered dynamically. |
| 547 | */ |
| 548 | |
| 549 | /* startup state */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 550 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | cx = &pr->power.states[i]; |
| 552 | if (!cx->valid) |
| 553 | continue; |
| 554 | |
| 555 | if (!state_is_set) |
| 556 | pr->power.state = cx; |
| 557 | state_is_set++; |
| 558 | break; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 559 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | |
| 561 | if (!state_is_set) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 562 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
| 564 | /* demotion */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 565 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | cx = &pr->power.states[i]; |
| 567 | if (!cx->valid) |
| 568 | continue; |
| 569 | |
| 570 | if (lower) { |
| 571 | cx->demotion.state = lower; |
| 572 | cx->demotion.threshold.ticks = cx->latency_ticks; |
| 573 | cx->demotion.threshold.count = 1; |
| 574 | if (cx->type == ACPI_STATE_C3) |
| 575 | cx->demotion.threshold.bm = bm_history; |
| 576 | } |
| 577 | |
| 578 | lower = cx; |
| 579 | } |
| 580 | |
| 581 | /* promotion */ |
| 582 | for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) { |
| 583 | cx = &pr->power.states[i]; |
| 584 | if (!cx->valid) |
| 585 | continue; |
| 586 | |
| 587 | if (higher) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 588 | cx->promotion.state = higher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | cx->promotion.threshold.ticks = cx->latency_ticks; |
| 590 | if (cx->type >= ACPI_STATE_C2) |
| 591 | cx->promotion.threshold.count = 4; |
| 592 | else |
| 593 | cx->promotion.threshold.count = 10; |
| 594 | if (higher->type == ACPI_STATE_C3) |
| 595 | cx->promotion.threshold.bm = bm_history; |
| 596 | } |
| 597 | |
| 598 | higher = cx; |
| 599 | } |
| 600 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 601 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | } |
| 603 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 604 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
| 607 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 608 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
| 610 | if (!pr->pblk) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 611 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | /* if info is obtained from pblk/fadt, type equals state */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
| 615 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; |
| 616 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 617 | #ifndef CONFIG_HOTPLUG_CPU |
| 618 | /* |
| 619 | * Check for P_LVL2_UP flag before entering C2 and above on |
| 620 | * an SMP system. |
| 621 | */ |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 622 | if ((num_online_cpus() > 1) && !acpi_fadt.plvl2_up) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 623 | return -ENODEV; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 624 | #endif |
| 625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | /* determine C2 and C3 address from pblk */ |
| 627 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; |
| 628 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; |
| 629 | |
| 630 | /* determine latencies from FADT */ |
| 631 | pr->power.states[ACPI_STATE_C2].latency = acpi_fadt.plvl2_lat; |
| 632 | pr->power.states[ACPI_STATE_C3].latency = acpi_fadt.plvl3_lat; |
| 633 | |
| 634 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 635 | "lvl2[0x%08x] lvl3[0x%08x]\n", |
| 636 | pr->power.states[ACPI_STATE_C2].address, |
| 637 | pr->power.states[ACPI_STATE_C3].address)); |
| 638 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 639 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | } |
| 641 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 642 | static int acpi_processor_get_power_info_default(struct acpi_processor *pr) |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 643 | { |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 644 | if (!pr->power.states[ACPI_STATE_C1].valid) { |
| 645 | /* set the first C-State to C1 */ |
| 646 | /* all processors need to support C1 */ |
| 647 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; |
| 648 | pr->power.states[ACPI_STATE_C1].valid = 1; |
| 649 | } |
| 650 | /* the C0 state only exists as a filler in our array */ |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 651 | pr->power.states[ACPI_STATE_C0].valid = 1; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 652 | return 0; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 653 | } |
| 654 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 655 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 657 | acpi_status status = 0; |
| 658 | acpi_integer count; |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 659 | int current_count; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 660 | int i; |
| 661 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 662 | union acpi_object *cst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | if (nocst) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 666 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 668 | current_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | |
| 670 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); |
| 671 | if (ACPI_FAILURE(status)) { |
| 672 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 673 | return -ENODEV; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 674 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 676 | cst = (union acpi_object *)buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | /* There must be at least 2 elements */ |
| 679 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 680 | printk(KERN_ERR PREFIX "not enough elements in _CST\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | status = -EFAULT; |
| 682 | goto end; |
| 683 | } |
| 684 | |
| 685 | count = cst->package.elements[0].integer.value; |
| 686 | |
| 687 | /* Validate number of power states. */ |
| 688 | if (count < 1 || count != cst->package.count - 1) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 689 | printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | status = -EFAULT; |
| 691 | goto end; |
| 692 | } |
| 693 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | /* Tell driver that at least _CST is supported. */ |
| 695 | pr->flags.has_cst = 1; |
| 696 | |
| 697 | for (i = 1; i <= count; i++) { |
| 698 | union acpi_object *element; |
| 699 | union acpi_object *obj; |
| 700 | struct acpi_power_register *reg; |
| 701 | struct acpi_processor_cx cx; |
| 702 | |
| 703 | memset(&cx, 0, sizeof(cx)); |
| 704 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 705 | element = (union acpi_object *)&(cst->package.elements[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | if (element->type != ACPI_TYPE_PACKAGE) |
| 707 | continue; |
| 708 | |
| 709 | if (element->package.count != 4) |
| 710 | continue; |
| 711 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 712 | obj = (union acpi_object *)&(element->package.elements[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
| 714 | if (obj->type != ACPI_TYPE_BUFFER) |
| 715 | continue; |
| 716 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 717 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | |
| 719 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 720 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | continue; |
| 722 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | /* There should be an easy way to extract an integer... */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 724 | obj = (union acpi_object *)&(element->package.elements[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | if (obj->type != ACPI_TYPE_INTEGER) |
| 726 | continue; |
| 727 | |
| 728 | cx.type = obj->integer.value; |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 729 | /* |
| 730 | * Some buggy BIOSes won't list C1 in _CST - |
| 731 | * Let acpi_processor_get_power_info_default() handle them later |
| 732 | */ |
| 733 | if (i == 1 && cx.type != ACPI_STATE_C1) |
| 734 | current_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 736 | cx.address = reg->address; |
| 737 | cx.index = current_count + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 739 | cx.space_id = ACPI_CSTATE_SYSTEMIO; |
| 740 | if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { |
| 741 | if (acpi_processor_ffh_cstate_probe |
| 742 | (pr->id, &cx, reg) == 0) { |
| 743 | cx.space_id = ACPI_CSTATE_FFH; |
| 744 | } else if (cx.type != ACPI_STATE_C1) { |
| 745 | /* |
| 746 | * C1 is a special case where FIXED_HARDWARE |
| 747 | * can be handled in non-MWAIT way as well. |
| 748 | * In that case, save this _CST entry info. |
| 749 | * That is, we retain space_id of SYSTEM_IO for |
| 750 | * halt based C1. |
| 751 | * Otherwise, ignore this info and continue. |
| 752 | */ |
| 753 | continue; |
| 754 | } |
| 755 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 757 | obj = (union acpi_object *)&(element->package.elements[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | if (obj->type != ACPI_TYPE_INTEGER) |
| 759 | continue; |
| 760 | |
| 761 | cx.latency = obj->integer.value; |
| 762 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 763 | obj = (union acpi_object *)&(element->package.elements[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | if (obj->type != ACPI_TYPE_INTEGER) |
| 765 | continue; |
| 766 | |
| 767 | cx.power = obj->integer.value; |
| 768 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 769 | current_count++; |
| 770 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); |
| 771 | |
| 772 | /* |
| 773 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 |
| 774 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) |
| 775 | */ |
| 776 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { |
| 777 | printk(KERN_WARNING |
| 778 | "Limiting number of power states to max (%d)\n", |
| 779 | ACPI_PROCESSOR_MAX_POWER); |
| 780 | printk(KERN_WARNING |
| 781 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); |
| 782 | break; |
| 783 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | } |
| 785 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 786 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 787 | current_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
| 789 | /* Validate number of power states discovered */ |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 790 | if (current_count < 2) |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 791 | status = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 793 | end: |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 794 | kfree(buffer.pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 796 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | } |
| 798 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) |
| 800 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | |
| 802 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 803 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
| 805 | /* |
| 806 | * C2 latency must be less than or equal to 100 |
| 807 | * microseconds. |
| 808 | */ |
| 809 | else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { |
| 810 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 811 | "latency too large [%d]\n", cx->latency)); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 812 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | } |
| 814 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | /* |
| 816 | * Otherwise we've met all of our C2 requirements. |
| 817 | * Normalize the C2 latency to expidite policy |
| 818 | */ |
| 819 | cx->valid = 1; |
| 820 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
| 821 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 822 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | } |
| 824 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 825 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
| 826 | struct acpi_processor_cx *cx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 828 | static int bm_check_flag; |
| 829 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
| 831 | if (!cx->address) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 832 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
| 834 | /* |
| 835 | * C3 latency must be less than or equal to 1000 |
| 836 | * microseconds. |
| 837 | */ |
| 838 | else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { |
| 839 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 840 | "latency too large [%d]\n", cx->latency)); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 841 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | } |
| 843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | /* |
| 845 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) |
| 846 | * DMA transfers are used by any ISA device to avoid livelock. |
| 847 | * Note that we could disable Type-F DMA (as recommended by |
| 848 | * the erratum), but this is known to disrupt certain ISA |
| 849 | * devices thus we take the conservative approach. |
| 850 | */ |
| 851 | else if (errata.piix4.fdma) { |
| 852 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 853 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 854 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 857 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
| 858 | if (!bm_check_flag) { |
| 859 | /* Determine whether bm_check is needed based on CPU */ |
| 860 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); |
| 861 | bm_check_flag = pr->flags.bm_check; |
| 862 | } else { |
| 863 | pr->flags.bm_check = bm_check_flag; |
| 864 | } |
| 865 | |
| 866 | if (pr->flags.bm_check) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 867 | /* bus mastering control is necessary */ |
| 868 | if (!pr->flags.bm_control) { |
| 869 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 870 | "C3 support requires bus mastering control\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 871 | return; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 872 | } |
| 873 | } else { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 874 | /* |
| 875 | * WBINVD should be set in fadt, for C3 state to be |
| 876 | * supported on when bm_check is not required. |
| 877 | */ |
| 878 | if (acpi_fadt.wb_invd != 1) { |
| 879 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 880 | "Cache invalidation should work properly" |
| 881 | " for C3 to be enabled on SMP systems\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 882 | return; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 883 | } |
| 884 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 885 | 0, ACPI_MTX_DO_NOT_LOCK); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 886 | } |
| 887 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | /* |
| 889 | * Otherwise we've met all of our C3 requirements. |
| 890 | * Normalize the C3 latency to expidite policy. Enable |
| 891 | * checking of bus mastering status (bm_check) so we can |
| 892 | * use this in our C3 policy |
| 893 | */ |
| 894 | cx->valid = 1; |
| 895 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
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; |
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 int acpi_processor_power_verify(struct acpi_processor *pr) |
| 901 | { |
| 902 | unsigned int i; |
| 903 | unsigned int working = 0; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 904 | |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 905 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
Andi Kleen | 0b5c59a | 2006-03-26 02:24:07 +0100 | [diff] [blame] | 906 | int timer_broadcast = 0; |
| 907 | cpumask_t mask = cpumask_of_cpu(pr->id); |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 908 | on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1); |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 909 | #endif |
| 910 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 911 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
| 913 | |
| 914 | switch (cx->type) { |
| 915 | case ACPI_STATE_C1: |
| 916 | cx->valid = 1; |
| 917 | break; |
| 918 | |
| 919 | case ACPI_STATE_C2: |
| 920 | acpi_processor_power_verify_c2(cx); |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 921 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
| 922 | /* Some AMD systems fake C3 as C2, but still |
| 923 | have timer troubles */ |
| 924 | if (cx->valid && |
| 925 | boot_cpu_data.x86_vendor == X86_VENDOR_AMD) |
| 926 | timer_broadcast++; |
| 927 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | break; |
| 929 | |
| 930 | case ACPI_STATE_C3: |
| 931 | acpi_processor_power_verify_c3(pr, cx); |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 932 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 933 | if (cx->valid) |
| 934 | timer_broadcast++; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 935 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | break; |
| 937 | } |
| 938 | |
| 939 | if (cx->valid) |
| 940 | working++; |
| 941 | } |
| 942 | |
Andi Kleen | 0b5c59a | 2006-03-26 02:24:07 +0100 | [diff] [blame] | 943 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 944 | if (timer_broadcast) |
| 945 | on_each_cpu(switch_APIC_timer_to_ipi, &mask, 1, 1); |
Andi Kleen | 0b5c59a | 2006-03-26 02:24:07 +0100 | [diff] [blame] | 946 | #endif |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 947 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | return (working); |
| 949 | } |
| 950 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 951 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | { |
| 953 | unsigned int i; |
| 954 | int result; |
| 955 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | |
| 957 | /* NOTE: the idle thread may not be running while calling |
| 958 | * this function */ |
| 959 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 960 | /* Zero initialize all the C-states info. */ |
| 961 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
| 962 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | result = acpi_processor_get_power_info_cst(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 964 | if (result == -ENODEV) |
Darrick J. Wong | c5a114f | 2006-10-19 23:28:28 -0700 | [diff] [blame] | 965 | result = acpi_processor_get_power_info_fadt(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 966 | |
Venkatesh Pallipadi | 991528d | 2006-09-25 16:28:13 -0700 | [diff] [blame] | 967 | if (result) |
| 968 | return result; |
| 969 | |
| 970 | acpi_processor_get_power_info_default(pr); |
| 971 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 972 | pr->power.count = acpi_processor_power_verify(pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
| 974 | /* |
| 975 | * Set Default Policy |
| 976 | * ------------------ |
| 977 | * Now that we know which states are supported, set the default |
| 978 | * policy. Note that this policy can be changed dynamically |
| 979 | * (e.g. encourage deeper sleeps to conserve battery life when |
| 980 | * not on AC). |
| 981 | */ |
| 982 | result = acpi_processor_set_power_policy(pr); |
| 983 | if (result) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 984 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | |
| 986 | /* |
| 987 | * if one state of type C2 or C3 is available, mark this |
| 988 | * CPU as being "idle manageable" |
| 989 | */ |
| 990 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 991 | if (pr->power.states[i].valid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | pr->power.count = i; |
Linus Torvalds | 2203d6e | 2005-11-18 07:29:51 -0800 | [diff] [blame] | 993 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
| 994 | pr->flags.power = 1; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 995 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | } |
| 997 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 998 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | } |
| 1000 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1001 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1003 | int result = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | |
| 1006 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1007 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1009 | if (nocst) { |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1010 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | } |
| 1012 | |
| 1013 | if (!pr->flags.power_setup_done) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1014 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | |
| 1016 | /* Fall back to the default idle loop */ |
| 1017 | pm_idle = pm_idle_save; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1018 | synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | |
| 1020 | pr->flags.power = 0; |
| 1021 | result = acpi_processor_get_power_info(pr); |
| 1022 | if ((pr->flags.power == 1) && (pr->flags.power_setup_done)) |
| 1023 | pm_idle = acpi_processor_idle; |
| 1024 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1025 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | } |
| 1027 | |
| 1028 | /* proc interface */ |
| 1029 | |
| 1030 | static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) |
| 1031 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1032 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
| 1033 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | |
| 1036 | if (!pr) |
| 1037 | goto end; |
| 1038 | |
| 1039 | seq_printf(seq, "active state: C%zd\n" |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1040 | "max_cstate: C%d\n" |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1041 | "bus master activity: %08x\n" |
| 1042 | "maximum allowed latency: %d usec\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1043 | pr->power.state ? pr->power.state - pr->power.states : 0, |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1044 | max_cstate, (unsigned)pr->power.bm_activity, |
| 1045 | system_latency_constraint()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | |
| 1047 | seq_puts(seq, "states:\n"); |
| 1048 | |
| 1049 | for (i = 1; i <= pr->power.count; i++) { |
| 1050 | seq_printf(seq, " %cC%d: ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1051 | (&pr->power.states[i] == |
| 1052 | pr->power.state ? '*' : ' '), i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | |
| 1054 | if (!pr->power.states[i].valid) { |
| 1055 | seq_puts(seq, "<not supported>\n"); |
| 1056 | continue; |
| 1057 | } |
| 1058 | |
| 1059 | switch (pr->power.states[i].type) { |
| 1060 | case ACPI_STATE_C1: |
| 1061 | seq_printf(seq, "type[C1] "); |
| 1062 | break; |
| 1063 | case ACPI_STATE_C2: |
| 1064 | seq_printf(seq, "type[C2] "); |
| 1065 | break; |
| 1066 | case ACPI_STATE_C3: |
| 1067 | seq_printf(seq, "type[C3] "); |
| 1068 | break; |
| 1069 | default: |
| 1070 | seq_printf(seq, "type[--] "); |
| 1071 | break; |
| 1072 | } |
| 1073 | |
| 1074 | if (pr->power.states[i].promotion.state) |
| 1075 | seq_printf(seq, "promotion[C%zd] ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1076 | (pr->power.states[i].promotion.state - |
| 1077 | pr->power.states)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | else |
| 1079 | seq_puts(seq, "promotion[--] "); |
| 1080 | |
| 1081 | if (pr->power.states[i].demotion.state) |
| 1082 | seq_printf(seq, "demotion[C%zd] ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1083 | (pr->power.states[i].demotion.state - |
| 1084 | pr->power.states)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | else |
| 1086 | seq_puts(seq, "demotion[--] "); |
| 1087 | |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 1088 | seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1089 | pr->power.states[i].latency, |
Dominik Brodowski | a3c6598 | 2006-06-24 19:37:00 -0400 | [diff] [blame] | 1090 | pr->power.states[i].usage, |
| 1091 | pr->power.states[i].time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | } |
| 1093 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1094 | end: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1095 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | } |
| 1097 | |
| 1098 | static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) |
| 1099 | { |
| 1100 | return single_open(file, acpi_processor_power_seq_show, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1101 | PDE(inode)->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | } |
| 1103 | |
Arjan van de Ven | d750803 | 2006-07-04 13:06:00 -0400 | [diff] [blame] | 1104 | static const struct file_operations acpi_processor_power_fops = { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1105 | .open = acpi_processor_power_open_fs, |
| 1106 | .read = seq_read, |
| 1107 | .llseek = seq_lseek, |
| 1108 | .release = single_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | }; |
| 1110 | |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1111 | #ifdef CONFIG_SMP |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1112 | static void smp_callback(void *v) |
| 1113 | { |
| 1114 | /* we already woke the CPU up, nothing more to do */ |
| 1115 | } |
| 1116 | |
| 1117 | /* |
| 1118 | * This function gets called when a part of the kernel has a new latency |
| 1119 | * requirement. This means we need to get all processors out of their C-state, |
| 1120 | * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that |
| 1121 | * wakes them all right up. |
| 1122 | */ |
| 1123 | static int acpi_processor_latency_notify(struct notifier_block *b, |
| 1124 | unsigned long l, void *v) |
| 1125 | { |
| 1126 | smp_call_function(smp_callback, NULL, 0, 1); |
| 1127 | return NOTIFY_OK; |
| 1128 | } |
| 1129 | |
| 1130 | static struct notifier_block acpi_processor_latency_notifier = { |
| 1131 | .notifier_call = acpi_processor_latency_notify, |
| 1132 | }; |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1133 | #endif |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1134 | |
Pierre Ossman | 7af8b66 | 2006-10-10 14:20:31 -0700 | [diff] [blame] | 1135 | int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1136 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1138 | acpi_status status = 0; |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 1139 | static int first_run; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1140 | struct proc_dir_entry *entry = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | unsigned int i; |
| 1142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | |
| 1144 | if (!first_run) { |
| 1145 | dmi_check_system(processor_power_dmi_table); |
| 1146 | if (max_cstate < ACPI_C_STATES_MAX) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1147 | printk(KERN_NOTICE |
| 1148 | "ACPI: processor limited to max C-state %d\n", |
| 1149 | max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | first_run++; |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1151 | #ifdef CONFIG_SMP |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1152 | register_latency_notifier(&acpi_processor_latency_notifier); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1153 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | } |
| 1155 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1156 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1157 | return -EINVAL; |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1158 | |
| 1159 | if (acpi_fadt.cst_cnt && !nocst) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1160 | status = |
| 1161 | acpi_os_write_port(acpi_fadt.smi_cmd, acpi_fadt.cst_cnt, 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1163 | ACPI_EXCEPTION((AE_INFO, status, |
| 1164 | "Notifying BIOS of _CST ability failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | } |
| 1166 | } |
| 1167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | acpi_processor_get_power_info(pr); |
| 1169 | |
| 1170 | /* |
| 1171 | * Install the idle handler if processor power management is supported. |
| 1172 | * Note that we use previously set idle handler will be used on |
| 1173 | * platforms that only support C1. |
| 1174 | */ |
| 1175 | if ((pr->flags.power) && (!boot_option_idle_override)) { |
| 1176 | printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); |
| 1177 | for (i = 1; i <= pr->power.count; i++) |
| 1178 | if (pr->power.states[i].valid) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1179 | printk(" C%d[C%d]", i, |
| 1180 | pr->power.states[i].type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | printk(")\n"); |
| 1182 | |
| 1183 | if (pr->id == 0) { |
| 1184 | pm_idle_save = pm_idle; |
| 1185 | pm_idle = acpi_processor_idle; |
| 1186 | } |
| 1187 | } |
| 1188 | |
| 1189 | /* 'power' [R] */ |
| 1190 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1191 | S_IRUGO, acpi_device_dir(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | if (!entry) |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 1193 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | else { |
| 1195 | entry->proc_fops = &acpi_processor_power_fops; |
| 1196 | entry->data = acpi_driver_data(device); |
| 1197 | entry->owner = THIS_MODULE; |
| 1198 | } |
| 1199 | |
| 1200 | pr->flags.power_setup_done = 1; |
| 1201 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1202 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | } |
| 1204 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1205 | int acpi_processor_power_exit(struct acpi_processor *pr, |
| 1206 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | |
| 1209 | pr->flags.power_setup_done = 0; |
| 1210 | |
| 1211 | if (acpi_device_dir(device)) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1212 | remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
| 1213 | acpi_device_dir(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | |
| 1215 | /* Unregister the idle handler when processor #0 is removed. */ |
| 1216 | if (pr->id == 0) { |
| 1217 | pm_idle = pm_idle_save; |
| 1218 | |
| 1219 | /* |
| 1220 | * We are about to unload the current idle thread pm callback |
| 1221 | * (pm_idle), Wait for all processors to update cached/local |
| 1222 | * copies of pm_idle before proceeding. |
| 1223 | */ |
| 1224 | cpu_idle_wait(); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1225 | #ifdef CONFIG_SMP |
Arjan van de Ven | 5c87579 | 2006-09-30 23:27:17 -0700 | [diff] [blame] | 1226 | unregister_latency_notifier(&acpi_processor_latency_notifier); |
Andrew Morton | 1fec74a | 2006-10-17 00:09:58 -0700 | [diff] [blame] | 1227 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | } |
| 1229 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1230 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | } |