blob: 6deafb4aa0da02c44e3e4c1ded6d46c105a22012 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 Ruid9460fd22008-01-17 15:51:23 +080035#include <linux/sysdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#include <asm/uaccess.h>
38
39#include <acpi/acpi_bus.h>
40#include <acpi/processor.h>
41#include <acpi/acpi_drivers.h>
42
Len Browna192a952009-07-28 16:45:54 -040043#define PREFIX "ACPI: "
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#define ACPI_PROCESSOR_CLASS "processor"
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#define _COMPONENT ACPI_PROCESSOR_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050047ACPI_MODULE_NAME("processor_thermal");
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49/* --------------------------------------------------------------------------
50 Limit Interface
51 -------------------------------------------------------------------------- */
Len Brown4be44fc2005-08-05 00:44:28 -040052static int acpi_processor_apply_limit(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
Len Brown4be44fc2005-08-05 00:44:28 -040054 int result = 0;
55 u16 px = 0;
56 u16 tx = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -040060 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62 if (!pr->flags.limit)
Patrick Mocheld550d982006-06-27 00:41:40 -040063 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65 if (pr->flags.throttling) {
66 if (pr->limit.user.tx > tx)
67 tx = pr->limit.user.tx;
68 if (pr->limit.thermal.tx > tx)
69 tx = pr->limit.thermal.tx;
70
Frans Pop2a908002009-08-26 14:29:29 -070071 result = acpi_processor_set_throttling(pr, tx, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 if (result)
73 goto end;
74 }
75
76 pr->limit.state.px = px;
77 pr->limit.state.tx = tx;
78
Len Brown4be44fc2005-08-05 00:44:28 -040079 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
80 "Processor [%d] limit set to (P%d:T%d)\n", pr->id,
81 pr->limit.state.px, pr->limit.state.tx));
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Len Brown4be44fc2005-08-05 00:44:28 -040083 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 if (result)
Len Brown64684632006-06-26 23:41:38 -040085 printk(KERN_ERR PREFIX "Unable to set limit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Patrick Mocheld550d982006-06-27 00:41:40 -040087 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090#ifdef CONFIG_CPU_FREQ
91
92/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
93 * offers (in most cases) voltage scaling in addition to frequency scaling, and
94 * thus a cubic (instead of linear) reduction of energy. Also, we allow for
95 * _any_ cpufreq driver and not only the acpi-cpufreq driver.
96 */
97
Zhang Ruid9460fd22008-01-17 15:51:23 +080098#define CPUFREQ_THERMAL_MIN_STEP 0
99#define CPUFREQ_THERMAL_MAX_STEP 3
100
Mike Travisc938ac22008-03-05 08:31:29 -0800101static DEFINE_PER_CPU(unsigned int, cpufreq_thermal_reduction_pctg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102static unsigned int acpi_thermal_cpufreq_is_init = 0;
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104static int cpu_has_cpufreq(unsigned int cpu)
105{
106 struct cpufreq_policy policy;
Thomas Renninger1cbf4c52004-09-16 11:07:00 -0400107 if (!acpi_thermal_cpufreq_is_init || cpufreq_get_policy(&policy, cpu))
Thomas Renninger75b245b32005-12-21 01:29:00 -0500108 return 0;
109 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110}
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112static int acpi_thermal_cpufreq_increase(unsigned int cpu)
113{
114 if (!cpu_has_cpufreq(cpu))
115 return -ENODEV;
116
Mike Travisc938ac22008-03-05 08:31:29 -0800117 if (per_cpu(cpufreq_thermal_reduction_pctg, cpu) <
Zhang Ruid9460fd22008-01-17 15:51:23 +0800118 CPUFREQ_THERMAL_MAX_STEP) {
Mike Travisc938ac22008-03-05 08:31:29 -0800119 per_cpu(cpufreq_thermal_reduction_pctg, cpu)++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 cpufreq_update_policy(cpu);
121 return 0;
122 }
123
124 return -ERANGE;
125}
126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
128{
129 if (!cpu_has_cpufreq(cpu))
130 return -ENODEV;
131
Mike Travisc938ac22008-03-05 08:31:29 -0800132 if (per_cpu(cpufreq_thermal_reduction_pctg, cpu) >
Zhang Ruid9460fd22008-01-17 15:51:23 +0800133 (CPUFREQ_THERMAL_MIN_STEP + 1))
Mike Travisc938ac22008-03-05 08:31:29 -0800134 per_cpu(cpufreq_thermal_reduction_pctg, cpu)--;
Thomas Renninger1cbf4c52004-09-16 11:07:00 -0400135 else
Mike Travisc938ac22008-03-05 08:31:29 -0800136 per_cpu(cpufreq_thermal_reduction_pctg, cpu) = 0;
Thomas Renninger1cbf4c52004-09-16 11:07:00 -0400137 cpufreq_update_policy(cpu);
138 /* We reached max freq again and can leave passive mode */
Mike Travisc938ac22008-03-05 08:31:29 -0800139 return !per_cpu(cpufreq_thermal_reduction_pctg, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
Len Brown4be44fc2005-08-05 00:44:28 -0400142static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb,
143 unsigned long event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
145 struct cpufreq_policy *policy = data;
146 unsigned long max_freq = 0;
147
148 if (event != CPUFREQ_ADJUST)
149 goto out;
150
Mike Travisc938ac22008-03-05 08:31:29 -0800151 max_freq = (
152 policy->cpuinfo.max_freq *
153 (100 - per_cpu(cpufreq_thermal_reduction_pctg, policy->cpu) * 20)
154 ) / 100;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156 cpufreq_verify_within_limits(policy, 0, max_freq);
157
Len Brown4be44fc2005-08-05 00:44:28 -0400158 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 return 0;
160}
161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162static struct notifier_block acpi_thermal_cpufreq_notifier_block = {
163 .notifier_call = acpi_thermal_cpufreq_notifier,
164};
165
Zhang Ruid9460fd22008-01-17 15:51:23 +0800166static int cpufreq_get_max_state(unsigned int cpu)
167{
168 if (!cpu_has_cpufreq(cpu))
169 return 0;
170
171 return CPUFREQ_THERMAL_MAX_STEP;
172}
173
174static int cpufreq_get_cur_state(unsigned int cpu)
175{
176 if (!cpu_has_cpufreq(cpu))
177 return 0;
178
Mike Travisc938ac22008-03-05 08:31:29 -0800179 return per_cpu(cpufreq_thermal_reduction_pctg, cpu);
Zhang Ruid9460fd22008-01-17 15:51:23 +0800180}
181
182static int cpufreq_set_cur_state(unsigned int cpu, int state)
183{
184 if (!cpu_has_cpufreq(cpu))
185 return 0;
186
Mike Travisc938ac22008-03-05 08:31:29 -0800187 per_cpu(cpufreq_thermal_reduction_pctg, cpu) = state;
Zhang Ruid9460fd22008-01-17 15:51:23 +0800188 cpufreq_update_policy(cpu);
189 return 0;
190}
191
Len Brown4be44fc2005-08-05 00:44:28 -0400192void acpi_thermal_cpufreq_init(void)
193{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 int i;
195
Mike Travisc938ac22008-03-05 08:31:29 -0800196 for (i = 0; i < nr_cpu_ids; i++)
197 if (cpu_present(i))
198 per_cpu(cpufreq_thermal_reduction_pctg, i) = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
Len Brown4be44fc2005-08-05 00:44:28 -0400200 i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block,
201 CPUFREQ_POLICY_NOTIFIER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 if (!i)
203 acpi_thermal_cpufreq_is_init = 1;
204}
205
Len Brown4be44fc2005-08-05 00:44:28 -0400206void acpi_thermal_cpufreq_exit(void)
207{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 if (acpi_thermal_cpufreq_is_init)
Len Brown4be44fc2005-08-05 00:44:28 -0400209 cpufreq_unregister_notifier
210 (&acpi_thermal_cpufreq_notifier_block,
211 CPUFREQ_POLICY_NOTIFIER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213 acpi_thermal_cpufreq_is_init = 0;
214}
215
Len Brown4be44fc2005-08-05 00:44:28 -0400216#else /* ! CONFIG_CPU_FREQ */
Zhang Ruid9460fd22008-01-17 15:51:23 +0800217static int cpufreq_get_max_state(unsigned int cpu)
218{
219 return 0;
220}
221
222static int cpufreq_get_cur_state(unsigned int cpu)
223{
224 return 0;
225}
226
227static int cpufreq_set_cur_state(unsigned int cpu, int state)
228{
229 return 0;
230}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Len Brown4be44fc2005-08-05 00:44:28 -0400232static int acpi_thermal_cpufreq_increase(unsigned int cpu)
233{
234 return -ENODEV;
235}
236static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
237{
238 return -ENODEV;
239}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241#endif
242
Len Brown4be44fc2005-08-05 00:44:28 -0400243int acpi_processor_set_thermal_limit(acpi_handle handle, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244{
Len Brown4be44fc2005-08-05 00:44:28 -0400245 int result = 0;
246 struct acpi_processor *pr = NULL;
247 struct acpi_device *device = NULL;
Thomas Renninger1cbf4c52004-09-16 11:07:00 -0400248 int tx = 0, max_tx_px = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251 if ((type < ACPI_PROCESSOR_LIMIT_NONE)
Len Brown4be44fc2005-08-05 00:44:28 -0400252 || (type > ACPI_PROCESSOR_LIMIT_DECREMENT))
Patrick Mocheld550d982006-06-27 00:41:40 -0400253 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
255 result = acpi_bus_get_device(handle, &device);
256 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400257 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200259 pr = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400261 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263 /* Thermal limits are always relative to the current Px/Tx state. */
264 if (pr->flags.throttling)
265 pr->limit.thermal.tx = pr->throttling.state;
266
267 /*
268 * Our default policy is to only use throttling at the lowest
269 * performance state.
270 */
271
272 tx = pr->limit.thermal.tx;
273
274 switch (type) {
275
276 case ACPI_PROCESSOR_LIMIT_NONE:
277 do {
278 result = acpi_thermal_cpufreq_decrease(pr->id);
279 } while (!result);
280 tx = 0;
281 break;
282
283 case ACPI_PROCESSOR_LIMIT_INCREMENT:
284 /* if going up: P-states first, T-states later */
285
286 result = acpi_thermal_cpufreq_increase(pr->id);
287 if (!result)
288 goto end;
289 else if (result == -ERANGE)
290 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400291 "At maximum performance state\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
293 if (pr->flags.throttling) {
294 if (tx == (pr->throttling.state_count - 1))
295 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400296 "At maximum throttling state\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 else
298 tx++;
299 }
300 break;
301
302 case ACPI_PROCESSOR_LIMIT_DECREMENT:
303 /* if going down: T-states first, P-states later */
304
305 if (pr->flags.throttling) {
Thomas Renninger1cbf4c52004-09-16 11:07:00 -0400306 if (tx == 0) {
307 max_tx_px = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400309 "At minimum throttling state\n"));
Thomas Renninger1cbf4c52004-09-16 11:07:00 -0400310 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 tx--;
312 goto end;
313 }
314 }
315
316 result = acpi_thermal_cpufreq_decrease(pr->id);
Thomas Renninger1cbf4c52004-09-16 11:07:00 -0400317 if (result) {
318 /*
319 * We only could get -ERANGE, 1 or 0.
320 * In the first two cases we reached max freq again.
321 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400323 "At minimum performance state\n"));
Thomas Renninger1cbf4c52004-09-16 11:07:00 -0400324 max_tx_px = 1;
325 } else
326 max_tx_px = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 break;
329 }
330
Len Brown4be44fc2005-08-05 00:44:28 -0400331 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 if (pr->flags.throttling) {
333 pr->limit.thermal.px = 0;
334 pr->limit.thermal.tx = tx;
335
336 result = acpi_processor_apply_limit(pr);
337 if (result)
Len Brown64684632006-06-26 23:41:38 -0400338 printk(KERN_ERR PREFIX "Unable to set thermal limit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
340 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Thermal limit now (P%d:T%d)\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400341 pr->limit.thermal.px, pr->limit.thermal.tx));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 } else
343 result = 0;
Thomas Renninger1cbf4c52004-09-16 11:07:00 -0400344 if (max_tx_px)
Patrick Mocheld550d982006-06-27 00:41:40 -0400345 return 1;
Thomas Renninger1cbf4c52004-09-16 11:07:00 -0400346 else
Patrick Mocheld550d982006-06-27 00:41:40 -0400347 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348}
349
Len Brown4be44fc2005-08-05 00:44:28 -0400350int acpi_processor_get_limit_info(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
353 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400354 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356 if (pr->flags.throttling)
357 pr->flags.limit = 1;
358
Patrick Mocheld550d982006-06-27 00:41:40 -0400359 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360}
361
Zhang Ruid9460fd22008-01-17 15:51:23 +0800362/* thermal coolign device callbacks */
363static int acpi_processor_max_state(struct acpi_processor *pr)
364{
365 int max_state = 0;
366
367 /*
368 * There exists four states according to
369 * cpufreq_thermal_reduction_ptg. 0, 1, 2, 3
370 */
371 max_state += cpufreq_get_max_state(pr->id);
372 if (pr->flags.throttling)
373 max_state += (pr->throttling.state_count -1);
374
375 return max_state;
376}
377static int
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000378processor_get_max_state(struct thermal_cooling_device *cdev,
379 unsigned long *state)
Zhang Ruid9460fd22008-01-17 15:51:23 +0800380{
381 struct acpi_device *device = cdev->devdata;
382 struct acpi_processor *pr = acpi_driver_data(device);
383
384 if (!device || !pr)
385 return -EINVAL;
386
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000387 *state = acpi_processor_max_state(pr);
388 return 0;
Zhang Ruid9460fd22008-01-17 15:51:23 +0800389}
390
391static int
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000392processor_get_cur_state(struct thermal_cooling_device *cdev,
393 unsigned long *cur_state)
Zhang Ruid9460fd22008-01-17 15:51:23 +0800394{
395 struct acpi_device *device = cdev->devdata;
396 struct acpi_processor *pr = acpi_driver_data(device);
Zhang Ruid9460fd22008-01-17 15:51:23 +0800397
398 if (!device || !pr)
399 return -EINVAL;
400
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000401 *cur_state = cpufreq_get_cur_state(pr->id);
Zhang Ruid9460fd22008-01-17 15:51:23 +0800402 if (pr->flags.throttling)
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000403 *cur_state += pr->throttling.state;
404 return 0;
Zhang Ruid9460fd22008-01-17 15:51:23 +0800405}
406
407static int
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000408processor_set_cur_state(struct thermal_cooling_device *cdev,
409 unsigned long state)
Zhang Ruid9460fd22008-01-17 15:51:23 +0800410{
411 struct acpi_device *device = cdev->devdata;
412 struct acpi_processor *pr = acpi_driver_data(device);
413 int result = 0;
414 int max_pstate;
415
416 if (!device || !pr)
417 return -EINVAL;
418
419 max_pstate = cpufreq_get_max_state(pr->id);
420
421 if (state > acpi_processor_max_state(pr))
422 return -EINVAL;
423
424 if (state <= max_pstate) {
425 if (pr->flags.throttling && pr->throttling.state)
Frans Pop2a908002009-08-26 14:29:29 -0700426 result = acpi_processor_set_throttling(pr, 0, false);
Zhang Ruid9460fd22008-01-17 15:51:23 +0800427 cpufreq_set_cur_state(pr->id, state);
428 } else {
429 cpufreq_set_cur_state(pr->id, max_pstate);
430 result = acpi_processor_set_throttling(pr,
Frans Pop2a908002009-08-26 14:29:29 -0700431 state - max_pstate, false);
Zhang Ruid9460fd22008-01-17 15:51:23 +0800432 }
433 return result;
434}
435
436struct thermal_cooling_device_ops processor_cooling_ops = {
437 .get_max_state = processor_get_max_state,
438 .get_cur_state = processor_get_cur_state,
439 .set_cur_state = processor_set_cur_state,
440};
441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442/* /proc interface */
Zhao Yakui74cad4e2009-06-24 11:49:49 +0800443#ifdef CONFIG_ACPI_PROCFS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444static int acpi_processor_limit_seq_show(struct seq_file *seq, void *offset)
445{
H Hartley Sweeten070a24f2010-01-08 11:12:41 -0700446 struct acpi_processor *pr = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
448 if (!pr)
449 goto end;
450
451 if (!pr->flags.limit) {
452 seq_puts(seq, "<not supported>\n");
453 goto end;
454 }
455
456 seq_printf(seq, "active limit: P%d:T%d\n"
Len Brown4be44fc2005-08-05 00:44:28 -0400457 "user limit: P%d:T%d\n"
458 "thermal limit: P%d:T%d\n",
459 pr->limit.state.px, pr->limit.state.tx,
460 pr->limit.user.px, pr->limit.user.tx,
461 pr->limit.thermal.px, pr->limit.thermal.tx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
Len Brown4be44fc2005-08-05 00:44:28 -0400463 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400464 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465}
466
467static int acpi_processor_limit_open_fs(struct inode *inode, struct file *file)
468{
469 return single_open(file, acpi_processor_limit_seq_show,
Len Brown4be44fc2005-08-05 00:44:28 -0400470 PDE(inode)->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472
Adrian Bunk757b1862006-01-07 13:19:00 -0500473static ssize_t acpi_processor_write_limit(struct file * file,
474 const char __user * buffer,
475 size_t count, loff_t * data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476{
Len Brown4be44fc2005-08-05 00:44:28 -0400477 int result = 0;
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200478 struct seq_file *m = file->private_data;
479 struct acpi_processor *pr = m->private;
Len Brown4be44fc2005-08-05 00:44:28 -0400480 char limit_string[25] = { '\0' };
481 int px = 0;
482 int tx = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
485 if (!pr || (count > sizeof(limit_string) - 1)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400486 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 }
488
489 if (copy_from_user(limit_string, buffer, count)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400490 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
492
493 limit_string[count] = '\0';
494
495 if (sscanf(limit_string, "%d:%d", &px, &tx) != 2) {
Len Brown64684632006-06-26 23:41:38 -0400496 printk(KERN_ERR PREFIX "Invalid data format\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400497 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 }
499
500 if (pr->flags.throttling) {
501 if ((tx < 0) || (tx > (pr->throttling.state_count - 1))) {
Len Brown64684632006-06-26 23:41:38 -0400502 printk(KERN_ERR PREFIX "Invalid tx\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400503 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 }
505 pr->limit.user.tx = tx;
506 }
507
508 result = acpi_processor_apply_limit(pr);
509
Patrick Mocheld550d982006-06-27 00:41:40 -0400510 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511}
512
Jan Engelhardt070d8eb2009-01-12 00:07:55 +0100513const struct file_operations acpi_processor_limit_fops = {
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700514 .owner = THIS_MODULE,
Len Brown4be44fc2005-08-05 00:44:28 -0400515 .open = acpi_processor_limit_open_fs,
516 .read = seq_read,
Arjan van de Vend479e902006-01-06 16:47:00 -0500517 .write = acpi_processor_write_limit,
Len Brown4be44fc2005-08-05 00:44:28 -0400518 .llseek = seq_lseek,
519 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520};
Zhao Yakui74cad4e2009-06-24 11:49:49 +0800521#endif