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> |
| 6 | * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> |
| 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() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | #include <asm/io.h> |
| 43 | #include <asm/uaccess.h> |
| 44 | |
| 45 | #include <acpi/acpi_bus.h> |
| 46 | #include <acpi/processor.h> |
| 47 | |
| 48 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 |
| 49 | #define ACPI_PROCESSOR_CLASS "processor" |
| 50 | #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" |
| 51 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 52 | ACPI_MODULE_NAME("acpi_processor") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #define ACPI_PROCESSOR_FILE_POWER "power" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000) |
| 55 | #define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */ |
| 56 | #define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */ |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 57 | static void (*pm_idle_save) (void) __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | module_param(max_cstate, uint, 0644); |
| 59 | |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 60 | static unsigned int nocst __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | module_param(nocst, uint, 0000); |
| 62 | |
| 63 | /* |
| 64 | * bm_history -- bit-mask with a bit per jiffy of bus-master activity |
| 65 | * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms |
| 66 | * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms |
| 67 | * 100 HZ: 0x0000000F: 4 jiffies = 40ms |
| 68 | * reduce history for more aggressive entry into C3 |
| 69 | */ |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 70 | static unsigned int bm_history __read_mostly = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 71 | (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | module_param(bm_history, uint, 0644); |
| 73 | /* -------------------------------------------------------------------------- |
| 74 | Power Management |
| 75 | -------------------------------------------------------------------------- */ |
| 76 | |
| 77 | /* |
| 78 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. |
| 79 | * For now disable this. Probably a bug somewhere else. |
| 80 | * |
| 81 | * To skip this limit, boot/load with a large max_cstate limit. |
| 82 | */ |
David Shaohua Li | 335f16b | 2005-06-22 18:37:00 -0400 | [diff] [blame] | 83 | static int set_max_cstate(struct dmi_system_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | { |
| 85 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) |
| 86 | return 0; |
| 87 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 88 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 89 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
| 90 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Len Brown | 3d35600 | 2005-08-03 00:22:52 -0400 | [diff] [blame] | 92 | max_cstate = (long)id->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
Ashok Raj | 7ded568 | 2006-02-03 21:51:23 +0100 | [diff] [blame] | 97 | /* Actually this shouldn't be __cpuinitdata, would be better to fix the |
| 98 | callers to only run once -AK */ |
| 99 | static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { |
Thomas Rosner | 876c184 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 100 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 101 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 102 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1}, |
| 103 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 104 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 105 | DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1}, |
| 106 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 107 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 108 | DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1}, |
| 109 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 110 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 111 | DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1}, |
| 112 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 113 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 114 | DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1}, |
| 115 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 116 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 117 | DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1}, |
| 118 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 119 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 120 | DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1}, |
| 121 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 122 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 123 | DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1}, |
| 124 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 125 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 126 | DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1}, |
| 127 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 128 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 129 | DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1}, |
| 130 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 131 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 132 | DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1}, |
| 133 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 134 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 135 | DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1}, |
| 136 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 137 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 138 | DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1}, |
| 139 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 140 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 141 | DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1}, |
| 142 | { set_max_cstate, "IBM ThinkPad R40e", { |
| 143 | DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), |
| 144 | DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1}, |
| 145 | { set_max_cstate, "Medion 41700", { |
| 146 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 147 | DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1}, |
| 148 | { set_max_cstate, "Clevo 5600D", { |
| 149 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 150 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 151 | (void *)2}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | {}, |
| 153 | }; |
| 154 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 155 | static inline u32 ticks_elapsed(u32 t1, u32 t2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | { |
| 157 | if (t2 >= t1) |
| 158 | return (t2 - t1); |
| 159 | else if (!acpi_fadt.tmr_val_ext) |
| 160 | return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); |
| 161 | else |
| 162 | return ((0xFFFFFFFF - t1) + t2); |
| 163 | } |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | static void |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 166 | acpi_processor_power_activate(struct acpi_processor *pr, |
| 167 | struct acpi_processor_cx *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 169 | struct acpi_processor_cx *old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
| 171 | if (!pr || !new) |
| 172 | return; |
| 173 | |
| 174 | old = pr->power.state; |
| 175 | |
| 176 | if (old) |
| 177 | old->promotion.count = 0; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 178 | new->demotion.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | /* Cleanup from old state. */ |
| 181 | if (old) { |
| 182 | switch (old->type) { |
| 183 | case ACPI_STATE_C3: |
| 184 | /* Disable bus master reload */ |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 185 | if (new->type != ACPI_STATE_C3 && pr->flags.bm_check) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 186 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0, |
| 187 | ACPI_MTX_DO_NOT_LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | break; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | /* Prepare to use new state. */ |
| 193 | switch (new->type) { |
| 194 | case ACPI_STATE_C3: |
| 195 | /* Enable bus master reload */ |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 196 | if (old->type != ACPI_STATE_C3 && pr->flags.bm_check) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 197 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1, |
| 198 | ACPI_MTX_DO_NOT_LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | break; |
| 200 | } |
| 201 | |
| 202 | pr->power.state = new; |
| 203 | |
| 204 | return; |
| 205 | } |
| 206 | |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 207 | static void acpi_safe_halt(void) |
| 208 | { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 209 | current_thread_info()->status &= ~TS_POLLING; |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 210 | smp_mb__after_clear_bit(); |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 211 | if (!need_resched()) |
| 212 | safe_halt(); |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 213 | current_thread_info()->status |= TS_POLLING; |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 214 | } |
| 215 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 216 | static atomic_t c3_cpu_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 218 | static void acpi_processor_idle(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 220 | struct acpi_processor *pr = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | struct acpi_processor_cx *cx = NULL; |
| 222 | struct acpi_processor_cx *next_state = NULL; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 223 | int sleep_ticks = 0; |
| 224 | u32 t1, t2 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 226 | pr = processors[smp_processor_id()]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | if (!pr) |
| 228 | return; |
| 229 | |
| 230 | /* |
| 231 | * Interrupts must be disabled during bus mastering calculations and |
| 232 | * for C2/C3 transitions. |
| 233 | */ |
| 234 | local_irq_disable(); |
| 235 | |
| 236 | /* |
| 237 | * Check whether we truly need to go idle, or should |
| 238 | * reschedule: |
| 239 | */ |
| 240 | if (unlikely(need_resched())) { |
| 241 | local_irq_enable(); |
| 242 | return; |
| 243 | } |
| 244 | |
| 245 | cx = pr->power.state; |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 246 | if (!cx) { |
| 247 | if (pm_idle_save) |
| 248 | pm_idle_save(); |
| 249 | else |
| 250 | acpi_safe_halt(); |
| 251 | return; |
| 252 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | /* |
| 255 | * Check BM Activity |
| 256 | * ----------------- |
| 257 | * Check for bus mastering activity (if required), record, and check |
| 258 | * for demotion. |
| 259 | */ |
| 260 | if (pr->flags.bm_check) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 261 | u32 bm_status = 0; |
| 262 | unsigned long diff = jiffies - pr->power.bm_check_timestamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
| 264 | if (diff > 32) |
| 265 | diff = 32; |
| 266 | |
| 267 | while (diff) { |
| 268 | /* if we didn't get called, assume there was busmaster activity */ |
| 269 | diff--; |
| 270 | if (diff) |
| 271 | pr->power.bm_activity |= 0x1; |
| 272 | pr->power.bm_activity <<= 1; |
| 273 | } |
| 274 | |
| 275 | acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 276 | &bm_status, ACPI_MTX_DO_NOT_LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | if (bm_status) { |
| 278 | pr->power.bm_activity++; |
| 279 | acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 280 | 1, ACPI_MTX_DO_NOT_LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
| 282 | /* |
| 283 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect |
| 284 | * the true state of bus mastering activity; forcing us to |
| 285 | * manually check the BMIDEA bit of each IDE channel. |
| 286 | */ |
| 287 | else if (errata.piix4.bmisx) { |
| 288 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 289 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | pr->power.bm_activity++; |
| 291 | } |
| 292 | |
| 293 | pr->power.bm_check_timestamp = jiffies; |
| 294 | |
| 295 | /* |
| 296 | * Apply bus mastering demotion policy. Automatically demote |
| 297 | * to avoid a faulty transition. Note that the processor |
| 298 | * won't enter a low-power state during this call (to this |
| 299 | * funciton) but should upon the next. |
| 300 | * |
| 301 | * TBD: A better policy might be to fallback to the demotion |
| 302 | * state (use it for this quantum only) istead of |
| 303 | * demoting -- and rely on duration as our sole demotion |
| 304 | * qualification. This may, however, introduce DMA |
| 305 | * issues (e.g. floppy DMA transfer overrun/underrun). |
| 306 | */ |
| 307 | if (pr->power.bm_activity & cx->demotion.threshold.bm) { |
| 308 | local_irq_enable(); |
| 309 | next_state = cx->demotion.state; |
| 310 | goto end; |
| 311 | } |
| 312 | } |
| 313 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 314 | #ifdef CONFIG_HOTPLUG_CPU |
| 315 | /* |
| 316 | * Check for P_LVL2_UP flag before entering C2 and above on |
| 317 | * an SMP system. We do it here instead of doing it at _CST/P_LVL |
| 318 | * detection phase, to work cleanly with logical CPU hotplug. |
| 319 | */ |
| 320 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 321 | !pr->flags.has_cst && !acpi_fadt.plvl2_up) |
| 322 | cx = &pr->power.states[ACPI_STATE_C1]; |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 323 | #endif |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 324 | |
| 325 | cx->usage++; |
| 326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | /* |
| 328 | * Sleep: |
| 329 | * ------ |
| 330 | * Invoke the current Cx state to put the processor to sleep. |
| 331 | */ |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 332 | if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 333 | current_thread_info()->status &= ~TS_POLLING; |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 334 | smp_mb__after_clear_bit(); |
| 335 | if (need_resched()) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 336 | current_thread_info()->status |= TS_POLLING; |
Linus Torvalds | af2eb17 | 2005-12-02 23:09:06 -0800 | [diff] [blame] | 337 | local_irq_enable(); |
Nick Piggin | 2a298a3 | 2005-12-02 12:44:19 +1100 | [diff] [blame] | 338 | return; |
| 339 | } |
| 340 | } |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | switch (cx->type) { |
| 343 | |
| 344 | case ACPI_STATE_C1: |
| 345 | /* |
| 346 | * Invoke C1. |
| 347 | * Use the appropriate idle routine, the one that would |
| 348 | * be used without acpi C-states. |
| 349 | */ |
| 350 | if (pm_idle_save) |
| 351 | pm_idle_save(); |
| 352 | else |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 353 | acpi_safe_halt(); |
| 354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | /* |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 356 | * TBD: Can't get time duration while in C1, as resumes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | * go to an ISR rather than here. Need to instrument |
| 358 | * base interrupt handler. |
| 359 | */ |
| 360 | sleep_ticks = 0xFFFFFFFF; |
| 361 | break; |
| 362 | |
| 363 | case ACPI_STATE_C2: |
| 364 | /* Get start time (ticks) */ |
| 365 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); |
| 366 | /* Invoke C2 */ |
| 367 | inb(cx->address); |
| 368 | /* Dummy op - must do something useless after P_LVL2 read */ |
| 369 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); |
| 370 | /* Get end time (ticks) */ |
| 371 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 372 | |
| 373 | #ifdef CONFIG_GENERIC_TIME |
| 374 | /* TSC halts in C2, so notify users */ |
| 375 | mark_tsc_unstable(); |
| 376 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | /* Re-enable interrupts */ |
| 378 | local_irq_enable(); |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 379 | current_thread_info()->status |= TS_POLLING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | /* Compute time (ticks) that we were actually asleep */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 381 | sleep_ticks = |
| 382 | ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | break; |
| 384 | |
| 385 | case ACPI_STATE_C3: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 386 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 387 | if (pr->flags.bm_check) { |
| 388 | if (atomic_inc_return(&c3_cpu_count) == |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 389 | num_online_cpus()) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 390 | /* |
| 391 | * All CPUs are trying to go to C3 |
| 392 | * Disable bus master arbitration |
| 393 | */ |
| 394 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 395 | ACPI_MTX_DO_NOT_LOCK); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 396 | } |
| 397 | } else { |
| 398 | /* SMP with no shared cache... Invalidate cache */ |
| 399 | ACPI_FLUSH_CPU_CACHE(); |
| 400 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | /* Get start time (ticks) */ |
| 403 | t1 = inl(acpi_fadt.xpm_tmr_blk.address); |
| 404 | /* Invoke C3 */ |
| 405 | inb(cx->address); |
| 406 | /* Dummy op - must do something useless after P_LVL3 read */ |
| 407 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); |
| 408 | /* Get end time (ticks) */ |
| 409 | t2 = inl(acpi_fadt.xpm_tmr_blk.address); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 410 | if (pr->flags.bm_check) { |
| 411 | /* Enable bus master arbitration */ |
| 412 | atomic_dec(&c3_cpu_count); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 413 | acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, |
| 414 | ACPI_MTX_DO_NOT_LOCK); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 415 | } |
| 416 | |
john stultz | 539eb11 | 2006-06-26 00:25:10 -0700 | [diff] [blame] | 417 | #ifdef CONFIG_GENERIC_TIME |
| 418 | /* TSC halts in C3, so notify users */ |
| 419 | mark_tsc_unstable(); |
| 420 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | /* Re-enable interrupts */ |
| 422 | local_irq_enable(); |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 423 | current_thread_info()->status |= TS_POLLING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | /* Compute time (ticks) that we were actually asleep */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 425 | sleep_ticks = |
| 426 | ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | break; |
| 428 | |
| 429 | default: |
| 430 | local_irq_enable(); |
| 431 | return; |
| 432 | } |
| 433 | |
| 434 | next_state = pr->power.state; |
| 435 | |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 436 | #ifdef CONFIG_HOTPLUG_CPU |
| 437 | /* Don't do promotion/demotion */ |
| 438 | if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) && |
| 439 | !pr->flags.has_cst && !acpi_fadt.plvl2_up) { |
| 440 | next_state = cx; |
| 441 | goto end; |
| 442 | } |
| 443 | #endif |
| 444 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | /* |
| 446 | * Promotion? |
| 447 | * ---------- |
| 448 | * Track the number of longs (time asleep is greater than threshold) |
| 449 | * and promote when the count threshold is reached. Note that bus |
| 450 | * mastering activity may prevent promotions. |
| 451 | * Do not promote above max_cstate. |
| 452 | */ |
| 453 | if (cx->promotion.state && |
| 454 | ((cx->promotion.state - pr->power.states) <= max_cstate)) { |
| 455 | if (sleep_ticks > cx->promotion.threshold.ticks) { |
| 456 | cx->promotion.count++; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 457 | cx->demotion.count = 0; |
| 458 | if (cx->promotion.count >= |
| 459 | cx->promotion.threshold.count) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | if (pr->flags.bm_check) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 461 | if (! |
| 462 | (pr->power.bm_activity & cx-> |
| 463 | promotion.threshold.bm)) { |
| 464 | next_state = |
| 465 | cx->promotion.state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | goto end; |
| 467 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 468 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | next_state = cx->promotion.state; |
| 470 | goto end; |
| 471 | } |
| 472 | } |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * Demotion? |
| 478 | * --------- |
| 479 | * Track the number of shorts (time asleep is less than time threshold) |
| 480 | * and demote when the usage threshold is reached. |
| 481 | */ |
| 482 | if (cx->demotion.state) { |
| 483 | if (sleep_ticks < cx->demotion.threshold.ticks) { |
| 484 | cx->demotion.count++; |
| 485 | cx->promotion.count = 0; |
| 486 | if (cx->demotion.count >= cx->demotion.threshold.count) { |
| 487 | next_state = cx->demotion.state; |
| 488 | goto end; |
| 489 | } |
| 490 | } |
| 491 | } |
| 492 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 493 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | /* |
| 495 | * Demote if current state exceeds max_cstate |
| 496 | */ |
| 497 | if ((pr->power.state - pr->power.states) > max_cstate) { |
| 498 | if (cx->demotion.state) |
| 499 | next_state = cx->demotion.state; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * New Cx State? |
| 504 | * ------------- |
| 505 | * If we're going to start using a new Cx state we must clean up |
| 506 | * from the previous and prepare to use the new. |
| 507 | */ |
| 508 | if (next_state != pr->power.state) |
| 509 | acpi_processor_power_activate(pr, next_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | } |
| 511 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 512 | static int acpi_processor_set_power_policy(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | { |
| 514 | unsigned int i; |
| 515 | unsigned int state_is_set = 0; |
| 516 | struct acpi_processor_cx *lower = NULL; |
| 517 | struct acpi_processor_cx *higher = NULL; |
| 518 | struct acpi_processor_cx *cx; |
| 519 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 520 | ACPI_FUNCTION_TRACE("acpi_processor_set_power_policy"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
| 522 | if (!pr) |
| 523 | return_VALUE(-EINVAL); |
| 524 | |
| 525 | /* |
| 526 | * This function sets the default Cx state policy (OS idle handler). |
| 527 | * Our scheme is to promote quickly to C2 but more conservatively |
| 528 | * to C3. We're favoring C2 for its characteristics of low latency |
| 529 | * (quick response), good power savings, and ability to allow bus |
| 530 | * mastering activity. Note that the Cx state policy is completely |
| 531 | * customizable and can be altered dynamically. |
| 532 | */ |
| 533 | |
| 534 | /* startup state */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 535 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | cx = &pr->power.states[i]; |
| 537 | if (!cx->valid) |
| 538 | continue; |
| 539 | |
| 540 | if (!state_is_set) |
| 541 | pr->power.state = cx; |
| 542 | state_is_set++; |
| 543 | break; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 544 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
| 546 | if (!state_is_set) |
| 547 | return_VALUE(-ENODEV); |
| 548 | |
| 549 | /* demotion */ |
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 (lower) { |
| 556 | cx->demotion.state = lower; |
| 557 | cx->demotion.threshold.ticks = cx->latency_ticks; |
| 558 | cx->demotion.threshold.count = 1; |
| 559 | if (cx->type == ACPI_STATE_C3) |
| 560 | cx->demotion.threshold.bm = bm_history; |
| 561 | } |
| 562 | |
| 563 | lower = cx; |
| 564 | } |
| 565 | |
| 566 | /* promotion */ |
| 567 | for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) { |
| 568 | cx = &pr->power.states[i]; |
| 569 | if (!cx->valid) |
| 570 | continue; |
| 571 | |
| 572 | if (higher) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 573 | cx->promotion.state = higher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | cx->promotion.threshold.ticks = cx->latency_ticks; |
| 575 | if (cx->type >= ACPI_STATE_C2) |
| 576 | cx->promotion.threshold.count = 4; |
| 577 | else |
| 578 | cx->promotion.threshold.count = 10; |
| 579 | if (higher->type == ACPI_STATE_C3) |
| 580 | cx->promotion.threshold.bm = bm_history; |
| 581 | } |
| 582 | |
| 583 | higher = cx; |
| 584 | } |
| 585 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 586 | return_VALUE(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | } |
| 588 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 589 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_fadt"); |
| 592 | |
| 593 | if (!pr) |
| 594 | return_VALUE(-EINVAL); |
| 595 | |
| 596 | if (!pr->pblk) |
| 597 | return_VALUE(-ENODEV); |
| 598 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | /* if info is obtained from pblk/fadt, type equals state */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
| 601 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; |
| 602 | |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 603 | #ifndef CONFIG_HOTPLUG_CPU |
| 604 | /* |
| 605 | * Check for P_LVL2_UP flag before entering C2 and above on |
| 606 | * an SMP system. |
| 607 | */ |
David Shaohua Li | 1e48396 | 2005-12-01 17:00:00 -0500 | [diff] [blame] | 608 | if ((num_online_cpus() > 1) && !acpi_fadt.plvl2_up) |
Venkatesh Pallipadi | 4c03355 | 2005-09-15 12:20:00 -0400 | [diff] [blame] | 609 | return_VALUE(-ENODEV); |
| 610 | #endif |
| 611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | /* determine C2 and C3 address from pblk */ |
| 613 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; |
| 614 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; |
| 615 | |
| 616 | /* determine latencies from FADT */ |
| 617 | pr->power.states[ACPI_STATE_C2].latency = acpi_fadt.plvl2_lat; |
| 618 | pr->power.states[ACPI_STATE_C3].latency = acpi_fadt.plvl3_lat; |
| 619 | |
| 620 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 621 | "lvl2[0x%08x] lvl3[0x%08x]\n", |
| 622 | pr->power.states[ACPI_STATE_C2].address, |
| 623 | pr->power.states[ACPI_STATE_C3].address)); |
| 624 | |
| 625 | return_VALUE(0); |
| 626 | } |
| 627 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 628 | static int acpi_processor_get_power_info_default_c1(struct acpi_processor *pr) |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 629 | { |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 630 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_default_c1"); |
| 631 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 632 | /* Zero initialize all the C-states info. */ |
Linus Torvalds | 2203d6e | 2005-11-18 07:29:51 -0800 | [diff] [blame] | 633 | memset(pr->power.states, 0, sizeof(pr->power.states)); |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 634 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 635 | /* set the first C-State to C1 */ |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 636 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 637 | |
| 638 | /* the C0 state only exists as a filler in our array, |
| 639 | * and all processors need to support C1 */ |
| 640 | pr->power.states[ACPI_STATE_C0].valid = 1; |
| 641 | pr->power.states[ACPI_STATE_C1].valid = 1; |
| 642 | |
| 643 | return_VALUE(0); |
| 644 | } |
| 645 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 646 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 648 | acpi_status status = 0; |
| 649 | acpi_integer count; |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 650 | int current_count; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 651 | int i; |
| 652 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 653 | union acpi_object *cst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
| 655 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_cst"); |
| 656 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | if (nocst) |
| 658 | return_VALUE(-ENODEV); |
| 659 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 660 | current_count = 1; |
| 661 | |
| 662 | /* Zero initialize C2 onwards and prepare for fresh CST lookup */ |
| 663 | for (i = 2; i < ACPI_PROCESSOR_MAX_POWER; i++) |
| 664 | memset(&(pr->power.states[i]), 0, |
| 665 | sizeof(struct acpi_processor_cx)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | |
| 667 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); |
| 668 | if (ACPI_FAILURE(status)) { |
| 669 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); |
| 670 | return_VALUE(-ENODEV); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 671 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 673 | cst = (union acpi_object *)buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
| 675 | /* There must be at least 2 elements */ |
| 676 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 677 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 678 | "not enough elements in _CST\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | status = -EFAULT; |
| 680 | goto end; |
| 681 | } |
| 682 | |
| 683 | count = cst->package.elements[0].integer.value; |
| 684 | |
| 685 | /* Validate number of power states. */ |
| 686 | if (count < 1 || count != cst->package.count - 1) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 687 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 688 | "count given by _CST is not valid\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | status = -EFAULT; |
| 690 | goto end; |
| 691 | } |
| 692 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | /* Tell driver that at least _CST is supported. */ |
| 694 | pr->flags.has_cst = 1; |
| 695 | |
| 696 | for (i = 1; i <= count; i++) { |
| 697 | union acpi_object *element; |
| 698 | union acpi_object *obj; |
| 699 | struct acpi_power_register *reg; |
| 700 | struct acpi_processor_cx cx; |
| 701 | |
| 702 | memset(&cx, 0, sizeof(cx)); |
| 703 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 704 | element = (union acpi_object *)&(cst->package.elements[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | if (element->type != ACPI_TYPE_PACKAGE) |
| 706 | continue; |
| 707 | |
| 708 | if (element->package.count != 4) |
| 709 | continue; |
| 710 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 711 | obj = (union acpi_object *)&(element->package.elements[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
| 713 | if (obj->type != ACPI_TYPE_BUFFER) |
| 714 | continue; |
| 715 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 716 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | |
| 718 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 719 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | continue; |
| 721 | |
| 722 | cx.address = (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) ? |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 723 | 0 : reg->address; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | |
| 725 | /* There should be an easy way to extract an integer... */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 726 | obj = (union acpi_object *)&(element->package.elements[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | if (obj->type != ACPI_TYPE_INTEGER) |
| 728 | continue; |
| 729 | |
| 730 | cx.type = obj->integer.value; |
| 731 | |
| 732 | if ((cx.type != ACPI_STATE_C1) && |
| 733 | (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO)) |
| 734 | continue; |
| 735 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 736 | if ((cx.type < ACPI_STATE_C2) || (cx.type > ACPI_STATE_C3)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | continue; |
| 738 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 739 | obj = (union acpi_object *)&(element->package.elements[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | if (obj->type != ACPI_TYPE_INTEGER) |
| 741 | continue; |
| 742 | |
| 743 | cx.latency = obj->integer.value; |
| 744 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 745 | obj = (union acpi_object *)&(element->package.elements[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | if (obj->type != ACPI_TYPE_INTEGER) |
| 747 | continue; |
| 748 | |
| 749 | cx.power = obj->integer.value; |
| 750 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 751 | current_count++; |
| 752 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); |
| 753 | |
| 754 | /* |
| 755 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 |
| 756 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) |
| 757 | */ |
| 758 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { |
| 759 | printk(KERN_WARNING |
| 760 | "Limiting number of power states to max (%d)\n", |
| 761 | ACPI_PROCESSOR_MAX_POWER); |
| 762 | printk(KERN_WARNING |
| 763 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); |
| 764 | break; |
| 765 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | } |
| 767 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 768 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 769 | current_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
| 771 | /* Validate number of power states discovered */ |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 772 | if (current_count < 2) |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 773 | status = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 775 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | acpi_os_free(buffer.pointer); |
| 777 | |
| 778 | return_VALUE(status); |
| 779 | } |
| 780 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) |
| 782 | { |
| 783 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c2"); |
| 784 | |
| 785 | if (!cx->address) |
| 786 | return_VOID; |
| 787 | |
| 788 | /* |
| 789 | * C2 latency must be less than or equal to 100 |
| 790 | * microseconds. |
| 791 | */ |
| 792 | else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { |
| 793 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 794 | "latency too large [%d]\n", cx->latency)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | return_VOID; |
| 796 | } |
| 797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | /* |
| 799 | * Otherwise we've met all of our C2 requirements. |
| 800 | * Normalize the C2 latency to expidite policy |
| 801 | */ |
| 802 | cx->valid = 1; |
| 803 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
| 804 | |
| 805 | return_VOID; |
| 806 | } |
| 807 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 808 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
| 809 | struct acpi_processor_cx *cx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 811 | static int bm_check_flag; |
| 812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c3"); |
| 814 | |
| 815 | if (!cx->address) |
| 816 | return_VOID; |
| 817 | |
| 818 | /* |
| 819 | * C3 latency must be less than or equal to 1000 |
| 820 | * microseconds. |
| 821 | */ |
| 822 | else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { |
| 823 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 824 | "latency too large [%d]\n", cx->latency)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | return_VOID; |
| 826 | } |
| 827 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | /* |
| 829 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) |
| 830 | * DMA transfers are used by any ISA device to avoid livelock. |
| 831 | * Note that we could disable Type-F DMA (as recommended by |
| 832 | * the erratum), but this is known to disrupt certain ISA |
| 833 | * devices thus we take the conservative approach. |
| 834 | */ |
| 835 | else if (errata.piix4.fdma) { |
| 836 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 837 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | return_VOID; |
| 839 | } |
| 840 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 841 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
| 842 | if (!bm_check_flag) { |
| 843 | /* Determine whether bm_check is needed based on CPU */ |
| 844 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); |
| 845 | bm_check_flag = pr->flags.bm_check; |
| 846 | } else { |
| 847 | pr->flags.bm_check = bm_check_flag; |
| 848 | } |
| 849 | |
| 850 | if (pr->flags.bm_check) { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 851 | /* bus mastering control is necessary */ |
| 852 | if (!pr->flags.bm_control) { |
| 853 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 854 | "C3 support requires bus mastering control\n")); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 855 | return_VOID; |
| 856 | } |
| 857 | } else { |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 858 | /* |
| 859 | * WBINVD should be set in fadt, for C3 state to be |
| 860 | * supported on when bm_check is not required. |
| 861 | */ |
| 862 | if (acpi_fadt.wb_invd != 1) { |
| 863 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 864 | "Cache invalidation should work properly" |
| 865 | " for C3 to be enabled on SMP systems\n")); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 866 | return_VOID; |
| 867 | } |
| 868 | acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 869 | 0, ACPI_MTX_DO_NOT_LOCK); |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 870 | } |
| 871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | /* |
| 873 | * Otherwise we've met all of our C3 requirements. |
| 874 | * Normalize the C3 latency to expidite policy. Enable |
| 875 | * checking of bus mastering status (bm_check) so we can |
| 876 | * use this in our C3 policy |
| 877 | */ |
| 878 | cx->valid = 1; |
| 879 | cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
| 881 | return_VOID; |
| 882 | } |
| 883 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
| 885 | { |
| 886 | unsigned int i; |
| 887 | unsigned int working = 0; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 888 | |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 889 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
Andi Kleen | 0b5c59a | 2006-03-26 02:24:07 +0100 | [diff] [blame] | 890 | int timer_broadcast = 0; |
| 891 | cpumask_t mask = cpumask_of_cpu(pr->id); |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 892 | on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1); |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 893 | #endif |
| 894 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 895 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
| 897 | |
| 898 | switch (cx->type) { |
| 899 | case ACPI_STATE_C1: |
| 900 | cx->valid = 1; |
| 901 | break; |
| 902 | |
| 903 | case ACPI_STATE_C2: |
| 904 | acpi_processor_power_verify_c2(cx); |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 905 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
| 906 | /* Some AMD systems fake C3 as C2, but still |
| 907 | have timer troubles */ |
| 908 | if (cx->valid && |
| 909 | boot_cpu_data.x86_vendor == X86_VENDOR_AMD) |
| 910 | timer_broadcast++; |
| 911 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | break; |
| 913 | |
| 914 | case ACPI_STATE_C3: |
| 915 | acpi_processor_power_verify_c3(pr, cx); |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 916 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 917 | if (cx->valid) |
| 918 | timer_broadcast++; |
Venkatesh Pallipadi | 6eb0a0f | 2006-01-11 22:44:21 +0100 | [diff] [blame] | 919 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | break; |
| 921 | } |
| 922 | |
| 923 | if (cx->valid) |
| 924 | working++; |
| 925 | } |
| 926 | |
Andi Kleen | 0b5c59a | 2006-03-26 02:24:07 +0100 | [diff] [blame] | 927 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 928 | if (timer_broadcast) |
| 929 | on_each_cpu(switch_APIC_timer_to_ipi, &mask, 1, 1); |
Andi Kleen | 0b5c59a | 2006-03-26 02:24:07 +0100 | [diff] [blame] | 930 | #endif |
Andi Kleen | bd66334 | 2006-03-25 16:31:07 +0100 | [diff] [blame] | 931 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | return (working); |
| 933 | } |
| 934 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 935 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | { |
| 937 | unsigned int i; |
| 938 | int result; |
| 939 | |
| 940 | ACPI_FUNCTION_TRACE("acpi_processor_get_power_info"); |
| 941 | |
| 942 | /* NOTE: the idle thread may not be running while calling |
| 943 | * this function */ |
| 944 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 945 | /* Adding C1 state */ |
| 946 | acpi_processor_get_power_info_default_c1(pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | result = acpi_processor_get_power_info_cst(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 948 | if (result == -ENODEV) |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 949 | acpi_processor_get_power_info_fadt(pr); |
Venkatesh Pallipadi | 6d93c64 | 2005-09-15 12:19:00 -0400 | [diff] [blame] | 950 | |
Janosch Machowinski | cf82478 | 2005-08-20 08:02:00 -0400 | [diff] [blame] | 951 | pr->power.count = acpi_processor_power_verify(pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | |
| 953 | /* |
| 954 | * Set Default Policy |
| 955 | * ------------------ |
| 956 | * Now that we know which states are supported, set the default |
| 957 | * policy. Note that this policy can be changed dynamically |
| 958 | * (e.g. encourage deeper sleeps to conserve battery life when |
| 959 | * not on AC). |
| 960 | */ |
| 961 | result = acpi_processor_set_power_policy(pr); |
| 962 | if (result) |
| 963 | return_VALUE(result); |
| 964 | |
| 965 | /* |
| 966 | * if one state of type C2 or C3 is available, mark this |
| 967 | * CPU as being "idle manageable" |
| 968 | */ |
| 969 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 970 | if (pr->power.states[i].valid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | pr->power.count = i; |
Linus Torvalds | 2203d6e | 2005-11-18 07:29:51 -0800 | [diff] [blame] | 972 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
| 973 | pr->flags.power = 1; |
Venkatesh Pallipadi | acf05f4 | 2005-03-31 23:23:15 -0500 | [diff] [blame] | 974 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | } |
| 976 | |
| 977 | return_VALUE(0); |
| 978 | } |
| 979 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 980 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 982 | int result = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | |
| 984 | ACPI_FUNCTION_TRACE("acpi_processor_cst_has_changed"); |
| 985 | |
| 986 | if (!pr) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 987 | return_VALUE(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 989 | if (nocst) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | return_VALUE(-ENODEV); |
| 991 | } |
| 992 | |
| 993 | if (!pr->flags.power_setup_done) |
| 994 | return_VALUE(-ENODEV); |
| 995 | |
| 996 | /* Fall back to the default idle loop */ |
| 997 | pm_idle = pm_idle_save; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 998 | synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
| 1000 | pr->flags.power = 0; |
| 1001 | result = acpi_processor_get_power_info(pr); |
| 1002 | if ((pr->flags.power == 1) && (pr->flags.power_setup_done)) |
| 1003 | pm_idle = acpi_processor_idle; |
| 1004 | |
| 1005 | return_VALUE(result); |
| 1006 | } |
| 1007 | |
| 1008 | /* proc interface */ |
| 1009 | |
| 1010 | static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) |
| 1011 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1012 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
| 1013 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
| 1015 | ACPI_FUNCTION_TRACE("acpi_processor_power_seq_show"); |
| 1016 | |
| 1017 | if (!pr) |
| 1018 | goto end; |
| 1019 | |
| 1020 | seq_printf(seq, "active state: C%zd\n" |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1021 | "max_cstate: C%d\n" |
| 1022 | "bus master activity: %08x\n", |
| 1023 | pr->power.state ? pr->power.state - pr->power.states : 0, |
| 1024 | max_cstate, (unsigned)pr->power.bm_activity); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
| 1026 | seq_puts(seq, "states:\n"); |
| 1027 | |
| 1028 | for (i = 1; i <= pr->power.count; i++) { |
| 1029 | seq_printf(seq, " %cC%d: ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1030 | (&pr->power.states[i] == |
| 1031 | pr->power.state ? '*' : ' '), i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | |
| 1033 | if (!pr->power.states[i].valid) { |
| 1034 | seq_puts(seq, "<not supported>\n"); |
| 1035 | continue; |
| 1036 | } |
| 1037 | |
| 1038 | switch (pr->power.states[i].type) { |
| 1039 | case ACPI_STATE_C1: |
| 1040 | seq_printf(seq, "type[C1] "); |
| 1041 | break; |
| 1042 | case ACPI_STATE_C2: |
| 1043 | seq_printf(seq, "type[C2] "); |
| 1044 | break; |
| 1045 | case ACPI_STATE_C3: |
| 1046 | seq_printf(seq, "type[C3] "); |
| 1047 | break; |
| 1048 | default: |
| 1049 | seq_printf(seq, "type[--] "); |
| 1050 | break; |
| 1051 | } |
| 1052 | |
| 1053 | if (pr->power.states[i].promotion.state) |
| 1054 | seq_printf(seq, "promotion[C%zd] ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1055 | (pr->power.states[i].promotion.state - |
| 1056 | pr->power.states)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | else |
| 1058 | seq_puts(seq, "promotion[--] "); |
| 1059 | |
| 1060 | if (pr->power.states[i].demotion.state) |
| 1061 | seq_printf(seq, "demotion[C%zd] ", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1062 | (pr->power.states[i].demotion.state - |
| 1063 | pr->power.states)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | else |
| 1065 | seq_puts(seq, "demotion[--] "); |
| 1066 | |
| 1067 | seq_printf(seq, "latency[%03d] usage[%08d]\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1068 | pr->power.states[i].latency, |
| 1069 | pr->power.states[i].usage); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | } |
| 1071 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1072 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | return_VALUE(0); |
| 1074 | } |
| 1075 | |
| 1076 | static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) |
| 1077 | { |
| 1078 | return single_open(file, acpi_processor_power_seq_show, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1079 | PDE(inode)->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | static struct file_operations acpi_processor_power_fops = { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1083 | .open = acpi_processor_power_open_fs, |
| 1084 | .read = seq_read, |
| 1085 | .llseek = seq_lseek, |
| 1086 | .release = single_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | }; |
| 1088 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1089 | int acpi_processor_power_init(struct acpi_processor *pr, |
| 1090 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1092 | acpi_status status = 0; |
Andreas Mohr | b683505 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 1093 | static int first_run; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1094 | struct proc_dir_entry *entry = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | unsigned int i; |
| 1096 | |
| 1097 | ACPI_FUNCTION_TRACE("acpi_processor_power_init"); |
| 1098 | |
| 1099 | if (!first_run) { |
| 1100 | dmi_check_system(processor_power_dmi_table); |
| 1101 | if (max_cstate < ACPI_C_STATES_MAX) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1102 | printk(KERN_NOTICE |
| 1103 | "ACPI: processor limited to max C-state %d\n", |
| 1104 | max_cstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | first_run++; |
| 1106 | } |
| 1107 | |
Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame] | 1108 | if (!pr) |
| 1109 | return_VALUE(-EINVAL); |
| 1110 | |
| 1111 | if (acpi_fadt.cst_cnt && !nocst) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1112 | status = |
| 1113 | 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] | 1114 | if (ACPI_FAILURE(status)) { |
| 1115 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 1116 | "Notifying BIOS of _CST ability failed\n")); |
| 1117 | } |
| 1118 | } |
| 1119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | acpi_processor_get_power_info(pr); |
| 1121 | |
| 1122 | /* |
| 1123 | * Install the idle handler if processor power management is supported. |
| 1124 | * Note that we use previously set idle handler will be used on |
| 1125 | * platforms that only support C1. |
| 1126 | */ |
| 1127 | if ((pr->flags.power) && (!boot_option_idle_override)) { |
| 1128 | printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); |
| 1129 | for (i = 1; i <= pr->power.count; i++) |
| 1130 | if (pr->power.states[i].valid) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1131 | printk(" C%d[C%d]", i, |
| 1132 | pr->power.states[i].type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | printk(")\n"); |
| 1134 | |
| 1135 | if (pr->id == 0) { |
| 1136 | pm_idle_save = pm_idle; |
| 1137 | pm_idle = acpi_processor_idle; |
| 1138 | } |
| 1139 | } |
| 1140 | |
| 1141 | /* 'power' [R] */ |
| 1142 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1143 | S_IRUGO, acpi_device_dir(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | if (!entry) |
| 1145 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1146 | "Unable to create '%s' fs entry\n", |
| 1147 | ACPI_PROCESSOR_FILE_POWER)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | else { |
| 1149 | entry->proc_fops = &acpi_processor_power_fops; |
| 1150 | entry->data = acpi_driver_data(device); |
| 1151 | entry->owner = THIS_MODULE; |
| 1152 | } |
| 1153 | |
| 1154 | pr->flags.power_setup_done = 1; |
| 1155 | |
| 1156 | return_VALUE(0); |
| 1157 | } |
| 1158 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1159 | int acpi_processor_power_exit(struct acpi_processor *pr, |
| 1160 | struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | { |
| 1162 | ACPI_FUNCTION_TRACE("acpi_processor_power_exit"); |
| 1163 | |
| 1164 | pr->flags.power_setup_done = 0; |
| 1165 | |
| 1166 | if (acpi_device_dir(device)) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1167 | remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, |
| 1168 | acpi_device_dir(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | |
| 1170 | /* Unregister the idle handler when processor #0 is removed. */ |
| 1171 | if (pr->id == 0) { |
| 1172 | pm_idle = pm_idle_save; |
| 1173 | |
| 1174 | /* |
| 1175 | * We are about to unload the current idle thread pm callback |
| 1176 | * (pm_idle), Wait for all processors to update cached/local |
| 1177 | * copies of pm_idle before proceeding. |
| 1178 | */ |
| 1179 | cpu_idle_wait(); |
| 1180 | } |
| 1181 | |
| 1182 | return_VALUE(0); |
| 1183 | } |