Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * processor_thermal.c - Passive cooling submodule of 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 |
| 9 | * |
| 10 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or (at |
| 15 | * your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, but |
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 20 | * General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License along |
| 23 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 24 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 25 | * |
| 26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 27 | */ |
| 28 | |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/cpufreq.h> |
| 33 | #include <linux/proc_fs.h> |
| 34 | #include <linux/seq_file.h> |
Zhang Rui | d9460fd22 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 35 | #include <linux/sysdev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | #include <asm/uaccess.h> |
| 38 | |
| 39 | #include <acpi/acpi_bus.h> |
| 40 | #include <acpi/processor.h> |
| 41 | #include <acpi/acpi_drivers.h> |
| 42 | |
| 43 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 |
| 44 | #define ACPI_PROCESSOR_CLASS "processor" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
Len Brown | f52fd66 | 2007-02-12 22:42:12 -0500 | [diff] [blame] | 46 | ACPI_MODULE_NAME("processor_thermal"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | /* -------------------------------------------------------------------------- |
| 49 | Limit Interface |
| 50 | -------------------------------------------------------------------------- */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 51 | static int acpi_processor_apply_limit(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 53 | int result = 0; |
| 54 | u16 px = 0; |
| 55 | u16 tx = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 59 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
| 61 | if (!pr->flags.limit) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 62 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | if (pr->flags.throttling) { |
| 65 | if (pr->limit.user.tx > tx) |
| 66 | tx = pr->limit.user.tx; |
| 67 | if (pr->limit.thermal.tx > tx) |
| 68 | tx = pr->limit.thermal.tx; |
| 69 | |
| 70 | result = acpi_processor_set_throttling(pr, tx); |
| 71 | if (result) |
| 72 | goto end; |
| 73 | } |
| 74 | |
| 75 | pr->limit.state.px = px; |
| 76 | pr->limit.state.tx = tx; |
| 77 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 78 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 79 | "Processor [%d] limit set to (P%d:T%d)\n", pr->id, |
| 80 | pr->limit.state.px, pr->limit.state.tx)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 82 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | if (result) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 84 | printk(KERN_ERR PREFIX "Unable to set limit\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 86 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | #ifdef CONFIG_CPU_FREQ |
| 90 | |
| 91 | /* If a passive cooling situation is detected, primarily CPUfreq is used, as it |
| 92 | * offers (in most cases) voltage scaling in addition to frequency scaling, and |
| 93 | * thus a cubic (instead of linear) reduction of energy. Also, we allow for |
| 94 | * _any_ cpufreq driver and not only the acpi-cpufreq driver. |
| 95 | */ |
| 96 | |
Zhang Rui | d9460fd22 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 97 | #define CPUFREQ_THERMAL_MIN_STEP 0 |
| 98 | #define CPUFREQ_THERMAL_MAX_STEP 3 |
| 99 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | static unsigned int cpufreq_thermal_reduction_pctg[NR_CPUS]; |
| 101 | static unsigned int acpi_thermal_cpufreq_is_init = 0; |
| 102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | static int cpu_has_cpufreq(unsigned int cpu) |
| 104 | { |
| 105 | struct cpufreq_policy policy; |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 106 | if (!acpi_thermal_cpufreq_is_init || cpufreq_get_policy(&policy, cpu)) |
Thomas Renninger | 75b245b3 | 2005-12-21 01:29:00 -0500 | [diff] [blame] | 107 | return 0; |
| 108 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | static int acpi_thermal_cpufreq_increase(unsigned int cpu) |
| 112 | { |
| 113 | if (!cpu_has_cpufreq(cpu)) |
| 114 | return -ENODEV; |
| 115 | |
Zhang Rui | d9460fd22 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 116 | if (cpufreq_thermal_reduction_pctg[cpu] < |
| 117 | CPUFREQ_THERMAL_MAX_STEP) { |
| 118 | cpufreq_thermal_reduction_pctg[cpu]++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | cpufreq_update_policy(cpu); |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | return -ERANGE; |
| 124 | } |
| 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | static int acpi_thermal_cpufreq_decrease(unsigned int cpu) |
| 127 | { |
| 128 | if (!cpu_has_cpufreq(cpu)) |
| 129 | return -ENODEV; |
| 130 | |
Zhang Rui | d9460fd22 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 131 | if (cpufreq_thermal_reduction_pctg[cpu] > |
| 132 | (CPUFREQ_THERMAL_MIN_STEP + 1)) |
| 133 | cpufreq_thermal_reduction_pctg[cpu]--; |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 134 | else |
| 135 | cpufreq_thermal_reduction_pctg[cpu] = 0; |
| 136 | cpufreq_update_policy(cpu); |
| 137 | /* We reached max freq again and can leave passive mode */ |
| 138 | return !cpufreq_thermal_reduction_pctg[cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } |
| 140 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 141 | static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb, |
| 142 | unsigned long event, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | { |
| 144 | struct cpufreq_policy *policy = data; |
| 145 | unsigned long max_freq = 0; |
| 146 | |
| 147 | if (event != CPUFREQ_ADJUST) |
| 148 | goto out; |
| 149 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 150 | max_freq = |
| 151 | (policy->cpuinfo.max_freq * |
Zhang Rui | d9460fd22 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 152 | (100 - cpufreq_thermal_reduction_pctg[policy->cpu] * 20)) / 100; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | cpufreq_verify_within_limits(policy, 0, max_freq); |
| 155 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 156 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | return 0; |
| 158 | } |
| 159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | static struct notifier_block acpi_thermal_cpufreq_notifier_block = { |
| 161 | .notifier_call = acpi_thermal_cpufreq_notifier, |
| 162 | }; |
| 163 | |
Zhang Rui | d9460fd22 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 164 | static int cpufreq_get_max_state(unsigned int cpu) |
| 165 | { |
| 166 | if (!cpu_has_cpufreq(cpu)) |
| 167 | return 0; |
| 168 | |
| 169 | return CPUFREQ_THERMAL_MAX_STEP; |
| 170 | } |
| 171 | |
| 172 | static int cpufreq_get_cur_state(unsigned int cpu) |
| 173 | { |
| 174 | if (!cpu_has_cpufreq(cpu)) |
| 175 | return 0; |
| 176 | |
| 177 | return cpufreq_thermal_reduction_pctg[cpu]; |
| 178 | } |
| 179 | |
| 180 | static int cpufreq_set_cur_state(unsigned int cpu, int state) |
| 181 | { |
| 182 | if (!cpu_has_cpufreq(cpu)) |
| 183 | return 0; |
| 184 | |
| 185 | cpufreq_thermal_reduction_pctg[cpu] = state; |
| 186 | cpufreq_update_policy(cpu); |
| 187 | return 0; |
| 188 | } |
| 189 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 190 | void acpi_thermal_cpufreq_init(void) |
| 191 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | int i; |
| 193 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 194 | for (i = 0; i < NR_CPUS; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | cpufreq_thermal_reduction_pctg[i] = 0; |
| 196 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 197 | i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block, |
| 198 | CPUFREQ_POLICY_NOTIFIER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | if (!i) |
| 200 | acpi_thermal_cpufreq_is_init = 1; |
| 201 | } |
| 202 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 203 | void acpi_thermal_cpufreq_exit(void) |
| 204 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | if (acpi_thermal_cpufreq_is_init) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 206 | cpufreq_unregister_notifier |
| 207 | (&acpi_thermal_cpufreq_notifier_block, |
| 208 | CPUFREQ_POLICY_NOTIFIER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
| 210 | acpi_thermal_cpufreq_is_init = 0; |
| 211 | } |
| 212 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 213 | #else /* ! CONFIG_CPU_FREQ */ |
Zhang Rui | d9460fd22 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 214 | static int cpufreq_get_max_state(unsigned int cpu) |
| 215 | { |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | static int cpufreq_get_cur_state(unsigned int cpu) |
| 220 | { |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | static int cpufreq_set_cur_state(unsigned int cpu, int state) |
| 225 | { |
| 226 | return 0; |
| 227 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 229 | static int acpi_thermal_cpufreq_increase(unsigned int cpu) |
| 230 | { |
| 231 | return -ENODEV; |
| 232 | } |
| 233 | static int acpi_thermal_cpufreq_decrease(unsigned int cpu) |
| 234 | { |
| 235 | return -ENODEV; |
| 236 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | #endif |
| 239 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 240 | int acpi_processor_set_thermal_limit(acpi_handle handle, int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 242 | int result = 0; |
| 243 | struct acpi_processor *pr = NULL; |
| 244 | struct acpi_device *device = NULL; |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 245 | int tx = 0, max_tx_px = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
| 248 | if ((type < ACPI_PROCESSOR_LIMIT_NONE) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 249 | || (type > ACPI_PROCESSOR_LIMIT_DECREMENT)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 250 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
| 252 | result = acpi_bus_get_device(handle, &device); |
| 253 | if (result) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 254 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 256 | pr = acpi_driver_data(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 258 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
| 260 | /* Thermal limits are always relative to the current Px/Tx state. */ |
| 261 | if (pr->flags.throttling) |
| 262 | pr->limit.thermal.tx = pr->throttling.state; |
| 263 | |
| 264 | /* |
| 265 | * Our default policy is to only use throttling at the lowest |
| 266 | * performance state. |
| 267 | */ |
| 268 | |
| 269 | tx = pr->limit.thermal.tx; |
| 270 | |
| 271 | switch (type) { |
| 272 | |
| 273 | case ACPI_PROCESSOR_LIMIT_NONE: |
| 274 | do { |
| 275 | result = acpi_thermal_cpufreq_decrease(pr->id); |
| 276 | } while (!result); |
| 277 | tx = 0; |
| 278 | break; |
| 279 | |
| 280 | case ACPI_PROCESSOR_LIMIT_INCREMENT: |
| 281 | /* if going up: P-states first, T-states later */ |
| 282 | |
| 283 | result = acpi_thermal_cpufreq_increase(pr->id); |
| 284 | if (!result) |
| 285 | goto end; |
| 286 | else if (result == -ERANGE) |
| 287 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 288 | "At maximum performance state\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
| 290 | if (pr->flags.throttling) { |
| 291 | if (tx == (pr->throttling.state_count - 1)) |
| 292 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 293 | "At maximum throttling state\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | else |
| 295 | tx++; |
| 296 | } |
| 297 | break; |
| 298 | |
| 299 | case ACPI_PROCESSOR_LIMIT_DECREMENT: |
| 300 | /* if going down: T-states first, P-states later */ |
| 301 | |
| 302 | if (pr->flags.throttling) { |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 303 | if (tx == 0) { |
| 304 | max_tx_px = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 306 | "At minimum throttling state\n")); |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 307 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | tx--; |
| 309 | goto end; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | result = acpi_thermal_cpufreq_decrease(pr->id); |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 314 | if (result) { |
| 315 | /* |
| 316 | * We only could get -ERANGE, 1 or 0. |
| 317 | * In the first two cases we reached max freq again. |
| 318 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 320 | "At minimum performance state\n")); |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 321 | max_tx_px = 1; |
| 322 | } else |
| 323 | max_tx_px = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
| 325 | break; |
| 326 | } |
| 327 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 328 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | if (pr->flags.throttling) { |
| 330 | pr->limit.thermal.px = 0; |
| 331 | pr->limit.thermal.tx = tx; |
| 332 | |
| 333 | result = acpi_processor_apply_limit(pr); |
| 334 | if (result) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 335 | printk(KERN_ERR PREFIX "Unable to set thermal limit\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
| 337 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Thermal limit now (P%d:T%d)\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 338 | pr->limit.thermal.px, pr->limit.thermal.tx)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | } else |
| 340 | result = 0; |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 341 | if (max_tx_px) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 342 | return 1; |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 343 | else |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 344 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 347 | int acpi_processor_get_limit_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
| 350 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 351 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
| 353 | if (pr->flags.throttling) |
| 354 | pr->flags.limit = 1; |
| 355 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 356 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | } |
| 358 | |
Zhang Rui | d9460fd22 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 359 | /* thermal coolign device callbacks */ |
| 360 | static int acpi_processor_max_state(struct acpi_processor *pr) |
| 361 | { |
| 362 | int max_state = 0; |
| 363 | |
| 364 | /* |
| 365 | * There exists four states according to |
| 366 | * cpufreq_thermal_reduction_ptg. 0, 1, 2, 3 |
| 367 | */ |
| 368 | max_state += cpufreq_get_max_state(pr->id); |
| 369 | if (pr->flags.throttling) |
| 370 | max_state += (pr->throttling.state_count -1); |
| 371 | |
| 372 | return max_state; |
| 373 | } |
| 374 | static int |
| 375 | processor_get_max_state(struct thermal_cooling_device *cdev, char *buf) |
| 376 | { |
| 377 | struct acpi_device *device = cdev->devdata; |
| 378 | struct acpi_processor *pr = acpi_driver_data(device); |
| 379 | |
| 380 | if (!device || !pr) |
| 381 | return -EINVAL; |
| 382 | |
| 383 | return sprintf(buf, "%d\n", acpi_processor_max_state(pr)); |
| 384 | } |
| 385 | |
| 386 | static int |
| 387 | processor_get_cur_state(struct thermal_cooling_device *cdev, char *buf) |
| 388 | { |
| 389 | struct acpi_device *device = cdev->devdata; |
| 390 | struct acpi_processor *pr = acpi_driver_data(device); |
| 391 | int cur_state; |
| 392 | |
| 393 | if (!device || !pr) |
| 394 | return -EINVAL; |
| 395 | |
| 396 | cur_state = cpufreq_get_cur_state(pr->id); |
| 397 | if (pr->flags.throttling) |
| 398 | cur_state += pr->throttling.state; |
| 399 | |
| 400 | return sprintf(buf, "%d\n", cur_state); |
| 401 | } |
| 402 | |
| 403 | static int |
| 404 | processor_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state) |
| 405 | { |
| 406 | struct acpi_device *device = cdev->devdata; |
| 407 | struct acpi_processor *pr = acpi_driver_data(device); |
| 408 | int result = 0; |
| 409 | int max_pstate; |
| 410 | |
| 411 | if (!device || !pr) |
| 412 | return -EINVAL; |
| 413 | |
| 414 | max_pstate = cpufreq_get_max_state(pr->id); |
| 415 | |
| 416 | if (state > acpi_processor_max_state(pr)) |
| 417 | return -EINVAL; |
| 418 | |
| 419 | if (state <= max_pstate) { |
| 420 | if (pr->flags.throttling && pr->throttling.state) |
| 421 | result = acpi_processor_set_throttling(pr, 0); |
| 422 | cpufreq_set_cur_state(pr->id, state); |
| 423 | } else { |
| 424 | cpufreq_set_cur_state(pr->id, max_pstate); |
| 425 | result = acpi_processor_set_throttling(pr, |
| 426 | state - max_pstate); |
| 427 | } |
| 428 | return result; |
| 429 | } |
| 430 | |
| 431 | struct thermal_cooling_device_ops processor_cooling_ops = { |
| 432 | .get_max_state = processor_get_max_state, |
| 433 | .get_cur_state = processor_get_cur_state, |
| 434 | .set_cur_state = processor_set_cur_state, |
| 435 | }; |
| 436 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | /* /proc interface */ |
| 438 | |
| 439 | static int acpi_processor_limit_seq_show(struct seq_file *seq, void *offset) |
| 440 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 441 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
| 444 | if (!pr) |
| 445 | goto end; |
| 446 | |
| 447 | if (!pr->flags.limit) { |
| 448 | seq_puts(seq, "<not supported>\n"); |
| 449 | goto end; |
| 450 | } |
| 451 | |
| 452 | seq_printf(seq, "active limit: P%d:T%d\n" |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 453 | "user limit: P%d:T%d\n" |
| 454 | "thermal limit: P%d:T%d\n", |
| 455 | pr->limit.state.px, pr->limit.state.tx, |
| 456 | pr->limit.user.px, pr->limit.user.tx, |
| 457 | pr->limit.thermal.px, pr->limit.thermal.tx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 459 | end: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 460 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | } |
| 462 | |
| 463 | static int acpi_processor_limit_open_fs(struct inode *inode, struct file *file) |
| 464 | { |
| 465 | return single_open(file, acpi_processor_limit_seq_show, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 466 | PDE(inode)->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | } |
| 468 | |
Adrian Bunk | 757b186 | 2006-01-07 13:19:00 -0500 | [diff] [blame] | 469 | static ssize_t acpi_processor_write_limit(struct file * file, |
| 470 | const char __user * buffer, |
| 471 | size_t count, loff_t * data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 473 | int result = 0; |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 474 | struct seq_file *m = file->private_data; |
| 475 | struct acpi_processor *pr = m->private; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 476 | char limit_string[25] = { '\0' }; |
| 477 | int px = 0; |
| 478 | int tx = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
| 481 | if (!pr || (count > sizeof(limit_string) - 1)) { |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 482 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | } |
| 484 | |
| 485 | if (copy_from_user(limit_string, buffer, count)) { |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 486 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | } |
| 488 | |
| 489 | limit_string[count] = '\0'; |
| 490 | |
| 491 | if (sscanf(limit_string, "%d:%d", &px, &tx) != 2) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 492 | printk(KERN_ERR PREFIX "Invalid data format\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 493 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | if (pr->flags.throttling) { |
| 497 | if ((tx < 0) || (tx > (pr->throttling.state_count - 1))) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 498 | printk(KERN_ERR PREFIX "Invalid tx\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 499 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | } |
| 501 | pr->limit.user.tx = tx; |
| 502 | } |
| 503 | |
| 504 | result = acpi_processor_apply_limit(pr); |
| 505 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 506 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | struct file_operations acpi_processor_limit_fops = { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 510 | .open = acpi_processor_limit_open_fs, |
| 511 | .read = seq_read, |
Arjan van de Ven | d479e90 | 2006-01-06 16:47:00 -0500 | [diff] [blame] | 512 | .write = acpi_processor_write_limit, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 513 | .llseek = seq_lseek, |
| 514 | .release = single_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | }; |