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 | d9460fd2 | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #define ACPI_PROCESSOR_CLASS "processor" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
Len Brown | f52fd66 | 2007-02-12 22:42:12 -0500 | [diff] [blame] | 45 | ACPI_MODULE_NAME("processor_thermal"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | /* -------------------------------------------------------------------------- |
| 48 | Limit Interface |
| 49 | -------------------------------------------------------------------------- */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 50 | static int acpi_processor_apply_limit(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 52 | int result = 0; |
| 53 | u16 px = 0; |
| 54 | u16 tx = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 58 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | if (!pr->flags.limit) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 61 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | if (pr->flags.throttling) { |
| 64 | if (pr->limit.user.tx > tx) |
| 65 | tx = pr->limit.user.tx; |
| 66 | if (pr->limit.thermal.tx > tx) |
| 67 | tx = pr->limit.thermal.tx; |
| 68 | |
| 69 | result = acpi_processor_set_throttling(pr, tx); |
| 70 | if (result) |
| 71 | goto end; |
| 72 | } |
| 73 | |
| 74 | pr->limit.state.px = px; |
| 75 | pr->limit.state.tx = tx; |
| 76 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 77 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 78 | "Processor [%d] limit set to (P%d:T%d)\n", pr->id, |
| 79 | pr->limit.state.px, pr->limit.state.tx)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 81 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | if (result) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 83 | printk(KERN_ERR PREFIX "Unable to set limit\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 85 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | } |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | #ifdef CONFIG_CPU_FREQ |
| 89 | |
| 90 | /* If a passive cooling situation is detected, primarily CPUfreq is used, as it |
| 91 | * offers (in most cases) voltage scaling in addition to frequency scaling, and |
| 92 | * thus a cubic (instead of linear) reduction of energy. Also, we allow for |
| 93 | * _any_ cpufreq driver and not only the acpi-cpufreq driver. |
| 94 | */ |
| 95 | |
Zhang Rui | d9460fd2 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 96 | #define CPUFREQ_THERMAL_MIN_STEP 0 |
| 97 | #define CPUFREQ_THERMAL_MAX_STEP 3 |
| 98 | |
Mike Travis | c938ac2 | 2008-03-05 08:31:29 -0800 | [diff] [blame] | 99 | static DEFINE_PER_CPU(unsigned int, cpufreq_thermal_reduction_pctg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | static unsigned int acpi_thermal_cpufreq_is_init = 0; |
| 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | static int cpu_has_cpufreq(unsigned int cpu) |
| 103 | { |
| 104 | struct cpufreq_policy policy; |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 105 | if (!acpi_thermal_cpufreq_is_init || cpufreq_get_policy(&policy, cpu)) |
Thomas Renninger | 75b245b3 | 2005-12-21 01:29:00 -0500 | [diff] [blame] | 106 | return 0; |
| 107 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
| 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | static int acpi_thermal_cpufreq_increase(unsigned int cpu) |
| 111 | { |
| 112 | if (!cpu_has_cpufreq(cpu)) |
| 113 | return -ENODEV; |
| 114 | |
Mike Travis | c938ac2 | 2008-03-05 08:31:29 -0800 | [diff] [blame] | 115 | if (per_cpu(cpufreq_thermal_reduction_pctg, cpu) < |
Zhang Rui | d9460fd2 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 116 | CPUFREQ_THERMAL_MAX_STEP) { |
Mike Travis | c938ac2 | 2008-03-05 08:31:29 -0800 | [diff] [blame] | 117 | per_cpu(cpufreq_thermal_reduction_pctg, cpu)++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | cpufreq_update_policy(cpu); |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | return -ERANGE; |
| 123 | } |
| 124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | static int acpi_thermal_cpufreq_decrease(unsigned int cpu) |
| 126 | { |
| 127 | if (!cpu_has_cpufreq(cpu)) |
| 128 | return -ENODEV; |
| 129 | |
Mike Travis | c938ac2 | 2008-03-05 08:31:29 -0800 | [diff] [blame] | 130 | if (per_cpu(cpufreq_thermal_reduction_pctg, cpu) > |
Zhang Rui | d9460fd2 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 131 | (CPUFREQ_THERMAL_MIN_STEP + 1)) |
Mike Travis | c938ac2 | 2008-03-05 08:31:29 -0800 | [diff] [blame] | 132 | per_cpu(cpufreq_thermal_reduction_pctg, cpu)--; |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 133 | else |
Mike Travis | c938ac2 | 2008-03-05 08:31:29 -0800 | [diff] [blame] | 134 | per_cpu(cpufreq_thermal_reduction_pctg, cpu) = 0; |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 135 | cpufreq_update_policy(cpu); |
| 136 | /* We reached max freq again and can leave passive mode */ |
Mike Travis | c938ac2 | 2008-03-05 08:31:29 -0800 | [diff] [blame] | 137 | return !per_cpu(cpufreq_thermal_reduction_pctg, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | } |
| 139 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 140 | static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb, |
| 141 | unsigned long event, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | { |
| 143 | struct cpufreq_policy *policy = data; |
| 144 | unsigned long max_freq = 0; |
| 145 | |
| 146 | if (event != CPUFREQ_ADJUST) |
| 147 | goto out; |
| 148 | |
Mike Travis | c938ac2 | 2008-03-05 08:31:29 -0800 | [diff] [blame] | 149 | max_freq = ( |
| 150 | policy->cpuinfo.max_freq * |
| 151 | (100 - per_cpu(cpufreq_thermal_reduction_pctg, policy->cpu) * 20) |
| 152 | ) / 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 | d9460fd2 | 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 | |
Mike Travis | c938ac2 | 2008-03-05 08:31:29 -0800 | [diff] [blame] | 177 | return per_cpu(cpufreq_thermal_reduction_pctg, cpu); |
Zhang Rui | d9460fd2 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 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 | |
Mike Travis | c938ac2 | 2008-03-05 08:31:29 -0800 | [diff] [blame] | 185 | per_cpu(cpufreq_thermal_reduction_pctg, cpu) = state; |
Zhang Rui | d9460fd2 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 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 | |
Mike Travis | c938ac2 | 2008-03-05 08:31:29 -0800 | [diff] [blame] | 194 | for (i = 0; i < nr_cpu_ids; i++) |
| 195 | if (cpu_present(i)) |
| 196 | per_cpu(cpufreq_thermal_reduction_pctg, i) = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 198 | i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block, |
| 199 | CPUFREQ_POLICY_NOTIFIER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | if (!i) |
| 201 | acpi_thermal_cpufreq_is_init = 1; |
| 202 | } |
| 203 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 204 | void acpi_thermal_cpufreq_exit(void) |
| 205 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | if (acpi_thermal_cpufreq_is_init) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 207 | cpufreq_unregister_notifier |
| 208 | (&acpi_thermal_cpufreq_notifier_block, |
| 209 | CPUFREQ_POLICY_NOTIFIER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
| 211 | acpi_thermal_cpufreq_is_init = 0; |
| 212 | } |
| 213 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 214 | #else /* ! CONFIG_CPU_FREQ */ |
Zhang Rui | d9460fd2 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 215 | static int cpufreq_get_max_state(unsigned int cpu) |
| 216 | { |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static int cpufreq_get_cur_state(unsigned int cpu) |
| 221 | { |
| 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | static int cpufreq_set_cur_state(unsigned int cpu, int state) |
| 226 | { |
| 227 | return 0; |
| 228 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 230 | static int acpi_thermal_cpufreq_increase(unsigned int cpu) |
| 231 | { |
| 232 | return -ENODEV; |
| 233 | } |
| 234 | static int acpi_thermal_cpufreq_decrease(unsigned int cpu) |
| 235 | { |
| 236 | return -ENODEV; |
| 237 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | #endif |
| 240 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 241 | int acpi_processor_set_thermal_limit(acpi_handle handle, int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 243 | int result = 0; |
| 244 | struct acpi_processor *pr = NULL; |
| 245 | struct acpi_device *device = NULL; |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 246 | int tx = 0, max_tx_px = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
| 249 | if ((type < ACPI_PROCESSOR_LIMIT_NONE) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 250 | || (type > ACPI_PROCESSOR_LIMIT_DECREMENT)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 251 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
| 253 | result = acpi_bus_get_device(handle, &device); |
| 254 | if (result) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 255 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 257 | pr = acpi_driver_data(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 259 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
| 261 | /* Thermal limits are always relative to the current Px/Tx state. */ |
| 262 | if (pr->flags.throttling) |
| 263 | pr->limit.thermal.tx = pr->throttling.state; |
| 264 | |
| 265 | /* |
| 266 | * Our default policy is to only use throttling at the lowest |
| 267 | * performance state. |
| 268 | */ |
| 269 | |
| 270 | tx = pr->limit.thermal.tx; |
| 271 | |
| 272 | switch (type) { |
| 273 | |
| 274 | case ACPI_PROCESSOR_LIMIT_NONE: |
| 275 | do { |
| 276 | result = acpi_thermal_cpufreq_decrease(pr->id); |
| 277 | } while (!result); |
| 278 | tx = 0; |
| 279 | break; |
| 280 | |
| 281 | case ACPI_PROCESSOR_LIMIT_INCREMENT: |
| 282 | /* if going up: P-states first, T-states later */ |
| 283 | |
| 284 | result = acpi_thermal_cpufreq_increase(pr->id); |
| 285 | if (!result) |
| 286 | goto end; |
| 287 | else if (result == -ERANGE) |
| 288 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 289 | "At maximum performance state\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
| 291 | if (pr->flags.throttling) { |
| 292 | if (tx == (pr->throttling.state_count - 1)) |
| 293 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 294 | "At maximum throttling state\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | else |
| 296 | tx++; |
| 297 | } |
| 298 | break; |
| 299 | |
| 300 | case ACPI_PROCESSOR_LIMIT_DECREMENT: |
| 301 | /* if going down: T-states first, P-states later */ |
| 302 | |
| 303 | if (pr->flags.throttling) { |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 304 | if (tx == 0) { |
| 305 | max_tx_px = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 307 | "At minimum throttling state\n")); |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 308 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | tx--; |
| 310 | goto end; |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | result = acpi_thermal_cpufreq_decrease(pr->id); |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 315 | if (result) { |
| 316 | /* |
| 317 | * We only could get -ERANGE, 1 or 0. |
| 318 | * In the first two cases we reached max freq again. |
| 319 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 321 | "At minimum performance state\n")); |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 322 | max_tx_px = 1; |
| 323 | } else |
| 324 | max_tx_px = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
| 326 | break; |
| 327 | } |
| 328 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 329 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | if (pr->flags.throttling) { |
| 331 | pr->limit.thermal.px = 0; |
| 332 | pr->limit.thermal.tx = tx; |
| 333 | |
| 334 | result = acpi_processor_apply_limit(pr); |
| 335 | if (result) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 336 | printk(KERN_ERR PREFIX "Unable to set thermal limit\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
| 338 | 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] | 339 | pr->limit.thermal.px, pr->limit.thermal.tx)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } else |
| 341 | result = 0; |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 342 | if (max_tx_px) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 343 | return 1; |
Thomas Renninger | 1cbf4c5 | 2004-09-16 11:07:00 -0400 | [diff] [blame] | 344 | else |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 345 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
| 347 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 348 | int acpi_processor_get_limit_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
| 351 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 352 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
| 354 | if (pr->flags.throttling) |
| 355 | pr->flags.limit = 1; |
| 356 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 357 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } |
| 359 | |
Zhang Rui | d9460fd2 | 2008-01-17 15:51:23 +0800 | [diff] [blame] | 360 | /* thermal coolign device callbacks */ |
| 361 | static int acpi_processor_max_state(struct acpi_processor *pr) |
| 362 | { |
| 363 | int max_state = 0; |
| 364 | |
| 365 | /* |
| 366 | * There exists four states according to |
| 367 | * cpufreq_thermal_reduction_ptg. 0, 1, 2, 3 |
| 368 | */ |
| 369 | max_state += cpufreq_get_max_state(pr->id); |
| 370 | if (pr->flags.throttling) |
| 371 | max_state += (pr->throttling.state_count -1); |
| 372 | |
| 373 | return max_state; |
| 374 | } |
| 375 | static int |
| 376 | processor_get_max_state(struct thermal_cooling_device *cdev, char *buf) |
| 377 | { |
| 378 | struct acpi_device *device = cdev->devdata; |
| 379 | struct acpi_processor *pr = acpi_driver_data(device); |
| 380 | |
| 381 | if (!device || !pr) |
| 382 | return -EINVAL; |
| 383 | |
| 384 | return sprintf(buf, "%d\n", acpi_processor_max_state(pr)); |
| 385 | } |
| 386 | |
| 387 | static int |
| 388 | processor_get_cur_state(struct thermal_cooling_device *cdev, char *buf) |
| 389 | { |
| 390 | struct acpi_device *device = cdev->devdata; |
| 391 | struct acpi_processor *pr = acpi_driver_data(device); |
| 392 | int cur_state; |
| 393 | |
| 394 | if (!device || !pr) |
| 395 | return -EINVAL; |
| 396 | |
| 397 | cur_state = cpufreq_get_cur_state(pr->id); |
| 398 | if (pr->flags.throttling) |
| 399 | cur_state += pr->throttling.state; |
| 400 | |
| 401 | return sprintf(buf, "%d\n", cur_state); |
| 402 | } |
| 403 | |
| 404 | static int |
| 405 | processor_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state) |
| 406 | { |
| 407 | struct acpi_device *device = cdev->devdata; |
| 408 | struct acpi_processor *pr = acpi_driver_data(device); |
| 409 | int result = 0; |
| 410 | int max_pstate; |
| 411 | |
| 412 | if (!device || !pr) |
| 413 | return -EINVAL; |
| 414 | |
| 415 | max_pstate = cpufreq_get_max_state(pr->id); |
| 416 | |
| 417 | if (state > acpi_processor_max_state(pr)) |
| 418 | return -EINVAL; |
| 419 | |
| 420 | if (state <= max_pstate) { |
| 421 | if (pr->flags.throttling && pr->throttling.state) |
| 422 | result = acpi_processor_set_throttling(pr, 0); |
| 423 | cpufreq_set_cur_state(pr->id, state); |
| 424 | } else { |
| 425 | cpufreq_set_cur_state(pr->id, max_pstate); |
| 426 | result = acpi_processor_set_throttling(pr, |
| 427 | state - max_pstate); |
| 428 | } |
| 429 | return result; |
| 430 | } |
| 431 | |
| 432 | struct thermal_cooling_device_ops processor_cooling_ops = { |
| 433 | .get_max_state = processor_get_max_state, |
| 434 | .get_cur_state = processor_get_cur_state, |
| 435 | .set_cur_state = processor_set_cur_state, |
| 436 | }; |
| 437 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | /* /proc interface */ |
| 439 | |
| 440 | static int acpi_processor_limit_seq_show(struct seq_file *seq, void *offset) |
| 441 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 442 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
| 445 | if (!pr) |
| 446 | goto end; |
| 447 | |
| 448 | if (!pr->flags.limit) { |
| 449 | seq_puts(seq, "<not supported>\n"); |
| 450 | goto end; |
| 451 | } |
| 452 | |
| 453 | seq_printf(seq, "active limit: P%d:T%d\n" |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 454 | "user limit: P%d:T%d\n" |
| 455 | "thermal limit: P%d:T%d\n", |
| 456 | pr->limit.state.px, pr->limit.state.tx, |
| 457 | pr->limit.user.px, pr->limit.user.tx, |
| 458 | pr->limit.thermal.px, pr->limit.thermal.tx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 460 | end: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 461 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
| 463 | |
| 464 | static int acpi_processor_limit_open_fs(struct inode *inode, struct file *file) |
| 465 | { |
| 466 | return single_open(file, acpi_processor_limit_seq_show, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 467 | PDE(inode)->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | } |
| 469 | |
Adrian Bunk | 757b186 | 2006-01-07 13:19:00 -0500 | [diff] [blame] | 470 | static ssize_t acpi_processor_write_limit(struct file * file, |
| 471 | const char __user * buffer, |
| 472 | size_t count, loff_t * data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 474 | int result = 0; |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 475 | struct seq_file *m = file->private_data; |
| 476 | struct acpi_processor *pr = m->private; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 477 | char limit_string[25] = { '\0' }; |
| 478 | int px = 0; |
| 479 | int tx = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
| 482 | if (!pr || (count > sizeof(limit_string) - 1)) { |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 483 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | if (copy_from_user(limit_string, buffer, count)) { |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 487 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | limit_string[count] = '\0'; |
| 491 | |
| 492 | if (sscanf(limit_string, "%d:%d", &px, &tx) != 2) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 493 | printk(KERN_ERR PREFIX "Invalid data format\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 494 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | } |
| 496 | |
| 497 | if (pr->flags.throttling) { |
| 498 | if ((tx < 0) || (tx > (pr->throttling.state_count - 1))) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 499 | printk(KERN_ERR PREFIX "Invalid tx\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 500 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | } |
| 502 | pr->limit.user.tx = tx; |
| 503 | } |
| 504 | |
| 505 | result = acpi_processor_apply_limit(pr); |
| 506 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 507 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | } |
| 509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | struct file_operations acpi_processor_limit_fops = { |
Denis V. Lunev | cf7acfa | 2008-04-29 01:02:27 -0700 | [diff] [blame] | 511 | .owner = THIS_MODULE, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 512 | .open = acpi_processor_limit_open_fs, |
| 513 | .read = seq_read, |
Arjan van de Ven | d479e90 | 2006-01-06 16:47:00 -0500 | [diff] [blame] | 514 | .write = acpi_processor_write_limit, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 515 | .llseek = seq_lseek, |
| 516 | .release = single_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | }; |