blob: 53e7ac9403a7dc21502e90a698ef1b27ad668a37 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
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 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or (at
16 * your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 *
27 */
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/cpufreq.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Miao Xie16be87e2008-10-24 17:22:04 +080035#ifdef CONFIG_X86
Thomas Renninger910dfae2008-09-01 14:27:04 +020036#include <asm/cpufeature.h>
Miao Xie16be87e2008-10-24 17:22:04 +080037#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <acpi/acpi_bus.h>
Bjorn Helgaas89595b82008-11-07 16:57:45 -070040#include <acpi/acpi_drivers.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <acpi/processor.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 ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
47#define _COMPONENT ACPI_PROCESSOR_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050048ACPI_MODULE_NAME("processor_perflib");
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Arjan van de Ven65c19bb2006-04-27 05:25:00 -040050static DEFINE_MUTEX(performance_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52/*
53 * _PPC support is implemented as a CPUfreq policy notifier:
54 * This means each time a CPUfreq driver registered also with
55 * the ACPI core is asked to change the speed policy, the maximum
56 * value is adjusted so that it is within the platform limit.
57 *
58 * Also, when a new platform limit value is detected, the CPUfreq
59 * policy is adjusted accordingly.
60 */
61
Thomas Renningera1531ac2008-07-29 22:32:58 -070062/* ignore_ppc:
63 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
64 * ignore _PPC
65 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
66 * 1 -> ignore _PPC totally -> forced by user through boot param
67 */
Milan Broz9f497bc2008-08-12 17:48:27 +020068static int ignore_ppc = -1;
Milan Broz613e5f32008-08-16 02:11:28 +020069module_param(ignore_ppc, int, 0644);
Thomas Renninger623b78c2007-05-18 21:59:28 -050070MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
71 "limited by BIOS, this should help");
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073#define PPC_REGISTERED 1
74#define PPC_IN_USE 2
75
Thomas Renningera1531ac2008-07-29 22:32:58 -070076static int acpi_processor_ppc_status;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78static int acpi_processor_ppc_notifier(struct notifier_block *nb,
Len Brown4be44fc2005-08-05 00:44:28 -040079 unsigned long event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080{
81 struct cpufreq_policy *policy = data;
82 struct acpi_processor *pr;
83 unsigned int ppc = 0;
84
Thomas Renningera1531ac2008-07-29 22:32:58 -070085 if (event == CPUFREQ_START && ignore_ppc <= 0) {
86 ignore_ppc = 0;
87 return 0;
88 }
89
Thomas Renninger623b78c2007-05-18 21:59:28 -050090 if (ignore_ppc)
91 return 0;
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 if (event != CPUFREQ_INCOMPATIBLE)
Thomas Renninger9b67c5d2008-07-29 22:32:59 -070094 return 0;
95
96 mutex_lock(&performance_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Mike Travis706546d2008-06-09 16:22:23 -070098 pr = per_cpu(processors, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 if (!pr || !pr->performance)
100 goto out;
101
Len Brown4be44fc2005-08-05 00:44:28 -0400102 ppc = (unsigned int)pr->performance_platform_limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Dave Jones0916bd32006-11-22 20:42:01 -0500104 if (ppc >= pr->performance->state_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 goto out;
106
107 cpufreq_verify_within_limits(policy, 0,
Len Brown4be44fc2005-08-05 00:44:28 -0400108 pr->performance->states[ppc].
109 core_frequency * 1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Len Brown4be44fc2005-08-05 00:44:28 -0400111 out:
Arjan van de Ven65c19bb2006-04-27 05:25:00 -0400112 mutex_unlock(&performance_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114 return 0;
115}
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117static struct notifier_block acpi_ppc_notifier_block = {
118 .notifier_call = acpi_processor_ppc_notifier,
119};
120
Len Brown4be44fc2005-08-05 00:44:28 -0400121static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Len Brown4be44fc2005-08-05 00:44:28 -0400123 acpi_status status = 0;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400124 unsigned long long ppc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
127 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400128 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130 /*
131 * _PPC indicates the maximum state currently supported by the platform
132 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
133 */
134 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
135
136 if (status != AE_NOT_FOUND)
137 acpi_processor_ppc_status |= PPC_IN_USE;
138
Len Brown4be44fc2005-08-05 00:44:28 -0400139 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400140 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400141 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 }
143
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200144 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
Thomas Renninger919158d2007-10-31 15:41:42 +0100145 (int)ppc, ppc ? "" : "not");
146
Len Brown4be44fc2005-08-05 00:44:28 -0400147 pr->performance_platform_limit = (int)ppc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Patrick Mocheld550d982006-06-27 00:41:40 -0400149 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
Zhao Yakuid81c45e12009-10-16 09:20:41 +0800152#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
153/*
154 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
155 * @handle: ACPI processor handle
156 * @status: the status code of _PPC evaluation
157 * 0: success. OSPM is now using the performance state specificed.
158 * 1: failure. OSPM has not changed the number of P-states in use
159 */
160static void acpi_processor_ppc_ost(acpi_handle handle, int status)
161{
162 union acpi_object params[2] = {
163 {.type = ACPI_TYPE_INTEGER,},
164 {.type = ACPI_TYPE_INTEGER,},
165 };
166 struct acpi_object_list arg_list = {2, params};
167 acpi_handle temp;
168
169 params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
170 params[1].integer.value = status;
171
172 /* when there is no _OST , skip it */
173 if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))
174 return;
175
176 acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
177 return;
178}
179
180int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
Thomas Renninger623b78c2007-05-18 21:59:28 -0500182 int ret;
183
Zhao Yakuid81c45e12009-10-16 09:20:41 +0800184 if (ignore_ppc) {
185 /*
186 * Only when it is notification event, the _OST object
187 * will be evaluated. Otherwise it is skipped.
188 */
189 if (event_flag)
190 acpi_processor_ppc_ost(pr->handle, 1);
Thomas Renninger623b78c2007-05-18 21:59:28 -0500191 return 0;
Zhao Yakuid81c45e12009-10-16 09:20:41 +0800192 }
Thomas Renninger623b78c2007-05-18 21:59:28 -0500193
194 ret = acpi_processor_get_platform_limit(pr);
Zhao Yakuid81c45e12009-10-16 09:20:41 +0800195 /*
196 * Only when it is notification event, the _OST object
197 * will be evaluated. Otherwise it is skipped.
198 */
199 if (event_flag) {
200 if (ret < 0)
201 acpi_processor_ppc_ost(pr->handle, 1);
202 else
203 acpi_processor_ppc_ost(pr->handle, 0);
204 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 if (ret < 0)
206 return (ret);
207 else
208 return cpufreq_update_policy(pr->id);
209}
210
Thomas Renningere2f74f32009-11-19 12:31:01 +0100211int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
212{
213 struct acpi_processor *pr;
214
215 pr = per_cpu(processors, cpu);
216 if (!pr || !pr->performance || !pr->performance->state_count)
217 return -ENODEV;
218 *limit = pr->performance->states[pr->performance_platform_limit].
219 core_frequency * 1000;
220 return 0;
221}
222EXPORT_SYMBOL(acpi_processor_get_bios_limit);
223
Len Brown4be44fc2005-08-05 00:44:28 -0400224void acpi_processor_ppc_init(void)
225{
226 if (!cpufreq_register_notifier
227 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 acpi_processor_ppc_status |= PPC_REGISTERED;
229 else
Len Brown4be44fc2005-08-05 00:44:28 -0400230 printk(KERN_DEBUG
231 "Warning: Processor Platform Limit not supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232}
233
Len Brown4be44fc2005-08-05 00:44:28 -0400234void acpi_processor_ppc_exit(void)
235{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 if (acpi_processor_ppc_status & PPC_REGISTERED)
Len Brown4be44fc2005-08-05 00:44:28 -0400237 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
238 CPUFREQ_POLICY_NOTIFIER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240 acpi_processor_ppc_status &= ~PPC_REGISTERED;
241}
242
Andi Kleen9061e0e2012-01-26 00:09:08 +0100243/*
244 * Do a quick check if the systems looks like it should use ACPI
245 * cpufreq. We look at a _PCT method being available, but don't
246 * do a whole lot of sanity checks.
247 */
248void acpi_processor_load_module(struct acpi_processor *pr)
249{
250 static int requested;
251 acpi_status status = 0;
252 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
253
254 if (!arch_has_acpi_pdc() || requested)
255 return;
256 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
257 if (!ACPI_FAILURE(status)) {
258 printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n");
259 request_module_nowait("acpi_cpufreq");
260 requested = 1;
261 }
262 kfree(buffer.pointer);
263}
264
Len Brown4be44fc2005-08-05 00:44:28 -0400265static int acpi_processor_get_performance_control(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266{
Len Brown4be44fc2005-08-05 00:44:28 -0400267 int result = 0;
268 acpi_status status = 0;
269 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
270 union acpi_object *pct = NULL;
271 union acpi_object obj = { 0 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
Len Brown4be44fc2005-08-05 00:44:28 -0400275 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400276 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400277 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 }
279
Len Brown4be44fc2005-08-05 00:44:28 -0400280 pct = (union acpi_object *)buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
Len Brown4be44fc2005-08-05 00:44:28 -0400282 || (pct->package.count != 2)) {
Len Brown64684632006-06-26 23:41:38 -0400283 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 result = -EFAULT;
285 goto end;
286 }
287
288 /*
289 * control_register
290 */
291
292 obj = pct->package.elements[0];
293
294 if ((obj.type != ACPI_TYPE_BUFFER)
Len Brown4be44fc2005-08-05 00:44:28 -0400295 || (obj.buffer.length < sizeof(struct acpi_pct_register))
296 || (obj.buffer.pointer == NULL)) {
Len Brown64684632006-06-26 23:41:38 -0400297 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 result = -EFAULT;
299 goto end;
300 }
Len Brown4be44fc2005-08-05 00:44:28 -0400301 memcpy(&pr->performance->control_register, obj.buffer.pointer,
302 sizeof(struct acpi_pct_register));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304 /*
305 * status_register
306 */
307
308 obj = pct->package.elements[1];
309
310 if ((obj.type != ACPI_TYPE_BUFFER)
Len Brown4be44fc2005-08-05 00:44:28 -0400311 || (obj.buffer.length < sizeof(struct acpi_pct_register))
312 || (obj.buffer.pointer == NULL)) {
Len Brown64684632006-06-26 23:41:38 -0400313 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 result = -EFAULT;
315 goto end;
316 }
317
Len Brown4be44fc2005-08-05 00:44:28 -0400318 memcpy(&pr->performance->status_register, obj.buffer.pointer,
319 sizeof(struct acpi_pct_register));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Len Brown4be44fc2005-08-05 00:44:28 -0400321 end:
Len Brown02438d82006-06-30 03:19:10 -0400322 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Patrick Mocheld550d982006-06-27 00:41:40 -0400324 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325}
326
Matthew Garrettf5940652012-09-04 08:28:06 +0000327#ifdef CONFIG_X86
328/*
329 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
330 * in their ACPI data. Calculate the real values and fix up the _PSS data.
331 */
332static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
333{
334 u32 hi, lo, fid, did;
335 int index = px->control & 0x00000007;
336
337 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
338 return;
339
340 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
341 || boot_cpu_data.x86 == 0x11) {
342 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
Stefan Bader9855d8c2013-01-22 13:37:21 +0100343 /*
344 * MSR C001_0064+:
345 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
346 */
347 if (!(hi & BIT(31)))
348 return;
349
Matthew Garrettf5940652012-09-04 08:28:06 +0000350 fid = lo & 0x3f;
351 did = (lo >> 6) & 7;
352 if (boot_cpu_data.x86 == 0x10)
353 px->core_frequency = (100 * (fid + 0x10)) >> did;
354 else
355 px->core_frequency = (100 * (fid + 8)) >> did;
356 }
357}
358#else
359static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
360#endif
361
Len Brown4be44fc2005-08-05 00:44:28 -0400362static int acpi_processor_get_performance_states(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
Len Brown4be44fc2005-08-05 00:44:28 -0400364 int result = 0;
365 acpi_status status = AE_OK;
366 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
367 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
368 struct acpi_buffer state = { 0, NULL };
369 union acpi_object *pss = NULL;
370 int i;
Marco Aurelio da Costad8e725f2012-05-04 18:53:44 +0200371 int last_invalid = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
Len Brown4be44fc2005-08-05 00:44:28 -0400375 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400376 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400377 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 }
379
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200380 pss = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
Len Brown64684632006-06-26 23:41:38 -0400382 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 result = -EFAULT;
384 goto end;
385 }
386
387 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400388 pss->package.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390 pr->performance->state_count = pss->package.count;
Len Brown4be44fc2005-08-05 00:44:28 -0400391 pr->performance->states =
392 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
393 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 if (!pr->performance->states) {
395 result = -ENOMEM;
396 goto end;
397 }
398
399 for (i = 0; i < pr->performance->state_count; i++) {
400
401 struct acpi_processor_px *px = &(pr->performance->states[i]);
402
403 state.length = sizeof(struct acpi_processor_px);
404 state.pointer = px;
405
406 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
407
408 status = acpi_extract_package(&(pss->package.elements[i]),
Len Brown4be44fc2005-08-05 00:44:28 -0400409 &format, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400411 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 result = -EFAULT;
413 kfree(pr->performance->states);
414 goto end;
415 }
416
Matthew Garrettf5940652012-09-04 08:28:06 +0000417 amd_fixup_frequency(px, i);
418
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400420 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
421 i,
422 (u32) px->core_frequency,
423 (u32) px->power,
424 (u32) px->transition_latency,
425 (u32) px->bus_master_latency,
426 (u32) px->control, (u32) px->status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Len Brown34d531e2009-05-26 15:11:06 -0400428 /*
429 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
430 */
431 if (!px->core_frequency ||
432 ((u32)(px->core_frequency * 1000) !=
433 (px->core_frequency * 1000))) {
434 printk(KERN_ERR FW_BUG PREFIX
Marco Aurelio da Costad8e725f2012-05-04 18:53:44 +0200435 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
436 pr->id, px->core_frequency);
437 if (last_invalid == -1)
438 last_invalid = i;
439 } else {
440 if (last_invalid != -1) {
441 /*
442 * Copy this valid entry over last_invalid entry
443 */
444 memcpy(&(pr->performance->states[last_invalid]),
445 px, sizeof(struct acpi_processor_px));
446 ++last_invalid;
447 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 }
449 }
450
Marco Aurelio da Costad8e725f2012-05-04 18:53:44 +0200451 if (last_invalid == 0) {
452 printk(KERN_ERR FW_BUG PREFIX
453 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
454 result = -EFAULT;
455 kfree(pr->performance->states);
456 pr->performance->states = NULL;
457 }
458
459 if (last_invalid > 0)
460 pr->performance->state_count = last_invalid;
461
Len Brown4be44fc2005-08-05 00:44:28 -0400462 end:
Len Brown02438d82006-06-30 03:19:10 -0400463 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Patrick Mocheld550d982006-06-27 00:41:40 -0400465 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466}
467
Len Brown4be44fc2005-08-05 00:44:28 -0400468static int acpi_processor_get_performance_info(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469{
Len Brown4be44fc2005-08-05 00:44:28 -0400470 int result = 0;
471 acpi_status status = AE_OK;
472 acpi_handle handle = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 if (!pr || !pr->performance || !pr->handle)
Patrick Mocheld550d982006-06-27 00:41:40 -0400475 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 status = acpi_get_handle(pr->handle, "_PCT", &handle);
478 if (ACPI_FAILURE(status)) {
479 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400480 "ACPI-based processor performance control unavailable\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400481 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 }
483
484 result = acpi_processor_get_performance_control(pr);
485 if (result)
Thomas Renninger910dfae2008-09-01 14:27:04 +0200486 goto update_bios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488 result = acpi_processor_get_performance_states(pr);
489 if (result)
Thomas Renninger910dfae2008-09-01 14:27:04 +0200490 goto update_bios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
Darrick J. Wong455c0d72010-02-18 10:28:20 -0800492 /* We need to call _PPC once when cpufreq starts */
493 if (ignore_ppc != 1)
494 result = acpi_processor_get_platform_limit(pr);
495
496 return result;
Thomas Renninger910dfae2008-09-01 14:27:04 +0200497
498 /*
499 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
500 * the BIOS is older than the CPU and does not know its frequencies
501 */
502 update_bios:
Miao Xie16be87e2008-10-24 17:22:04 +0800503#ifdef CONFIG_X86
Thomas Renninger910dfae2008-09-01 14:27:04 +0200504 if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
505 if(boot_cpu_has(X86_FEATURE_EST))
506 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
507 "frequency support\n");
508 }
Miao Xie16be87e2008-10-24 17:22:04 +0800509#endif
Thomas Renninger910dfae2008-09-01 14:27:04 +0200510 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511}
512
Len Brown4be44fc2005-08-05 00:44:28 -0400513int acpi_processor_notify_smm(struct module *calling_module)
514{
515 acpi_status status;
516 static int is_done = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
Patrick Mocheld550d982006-06-27 00:41:40 -0400520 return -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
522 if (!try_module_get(calling_module))
Patrick Mocheld550d982006-06-27 00:41:40 -0400523 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
Lucas De Marchi58f87ed2010-09-07 12:49:45 -0400525 /* is_done is set to negative if an error occurred,
526 * and to postitive if _no_ error occurred, but SMM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 * was already notified. This avoids double notification
528 * which might lead to unexpected results...
529 */
530 if (is_done > 0) {
531 module_put(calling_module);
Patrick Mocheld550d982006-06-27 00:41:40 -0400532 return 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400533 } else if (is_done < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 module_put(calling_module);
Patrick Mocheld550d982006-06-27 00:41:40 -0400535 return is_done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 }
537
538 is_done = -EIO;
539
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300540 /* Can't write pstate_control to smi_command if either value is zero */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300541 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300542 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 module_put(calling_module);
Patrick Mocheld550d982006-06-27 00:41:40 -0400544 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 }
546
Len Brown4be44fc2005-08-05 00:44:28 -0400547 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300548 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300549 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300551 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
552 (u32) acpi_gbl_FADT.pstate_control, 8);
Len Brown4be44fc2005-08-05 00:44:28 -0400553 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400554 ACPI_EXCEPTION((AE_INFO, status,
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300555 "Failed to write pstate_control [0x%x] to "
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300556 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
557 acpi_gbl_FADT.smi_command));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 module_put(calling_module);
Patrick Mocheld550d982006-06-27 00:41:40 -0400559 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 }
561
562 /* Success. If there's no _PPC, we need to fear nothing, so
563 * we can allow the cpufreq driver to be rmmod'ed. */
564 is_done = 1;
565
566 if (!(acpi_processor_ppc_status & PPC_IN_USE))
567 module_put(calling_module);
568
Patrick Mocheld550d982006-06-27 00:41:40 -0400569 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
Len Brown4be44fc2005-08-05 00:44:28 -0400572EXPORT_SYMBOL(acpi_processor_notify_smm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500574static int acpi_processor_get_psd(struct acpi_processor *pr)
575{
576 int result = 0;
577 acpi_status status = AE_OK;
578 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
579 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
580 struct acpi_buffer state = {0, NULL};
581 union acpi_object *psd = NULL;
582 struct acpi_psd_package *pdomain;
583
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500584 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
585 if (ACPI_FAILURE(status)) {
Len Brown9011bff42006-05-11 00:28:12 -0400586 return -ENODEV;
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500587 }
588
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200589 psd = buffer.pointer;
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500590 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800591 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500592 result = -EFAULT;
593 goto end;
594 }
595
596 if (psd->package.count != 1) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800597 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500598 result = -EFAULT;
599 goto end;
600 }
601
602 pdomain = &(pr->performance->domain_info);
603
604 state.length = sizeof(struct acpi_psd_package);
605 state.pointer = pdomain;
606
607 status = acpi_extract_package(&(psd->package.elements[0]),
608 &format, &state);
609 if (ACPI_FAILURE(status)) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800610 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500611 result = -EFAULT;
612 goto end;
613 }
614
615 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800616 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500617 result = -EFAULT;
618 goto end;
619 }
620
621 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800622 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500623 result = -EFAULT;
624 goto end;
625 }
626
Stanislaw Gruszkae1eb4772009-03-24 13:41:59 +0100627 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
628 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
629 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
630 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
631 result = -EFAULT;
632 goto end;
633 }
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500634end:
Len Brown02438d82006-06-30 03:19:10 -0400635 kfree(buffer.pointer);
Len Brown9011bff42006-05-11 00:28:12 -0400636 return result;
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500637}
638
639int acpi_processor_preregister_performance(
Tejun Heoa29d8b82010-02-02 14:39:15 +0900640 struct acpi_processor_performance __percpu *performance)
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500641{
642 int count, count_target;
643 int retval = 0;
644 unsigned int i, j;
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800645 cpumask_var_t covered_cpus;
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500646 struct acpi_processor *pr;
647 struct acpi_psd_package *pdomain;
648 struct acpi_processor *match_pr;
649 struct acpi_psd_package *match_pdomain;
650
Li Zefan79f55992009-06-15 14:58:26 +0800651 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800652 return -ENOMEM;
653
Len Brown785fccc2006-06-15 22:19:31 -0400654 mutex_lock(&performance_mutex);
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500655
Stanislaw Gruszkae1eb4772009-03-24 13:41:59 +0100656 /*
657 * Check if another driver has already registered, and abort before
658 * changing pr->performance if it has. Check input data as well.
659 */
KAMEZAWA Hiroyuki193de0c2006-04-27 05:25:00 -0400660 for_each_possible_cpu(i) {
Mike Travis706546d2008-06-09 16:22:23 -0700661 pr = per_cpu(processors, i);
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500662 if (!pr) {
663 /* Look only at processors in ACPI namespace */
664 continue;
665 }
666
667 if (pr->performance) {
668 retval = -EBUSY;
Stanislaw Gruszkae1eb4772009-03-24 13:41:59 +0100669 goto err_out;
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500670 }
671
Rusty Russellb36128c2009-02-20 16:29:08 +0900672 if (!performance || !per_cpu_ptr(performance, i)) {
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500673 retval = -EINVAL;
Stanislaw Gruszkae1eb4772009-03-24 13:41:59 +0100674 goto err_out;
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500675 }
Stanislaw Gruszkae1eb4772009-03-24 13:41:59 +0100676 }
677
678 /* Call _PSD for all CPUs */
679 for_each_possible_cpu(i) {
680 pr = per_cpu(processors, i);
681 if (!pr)
682 continue;
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500683
Rusty Russellb36128c2009-02-20 16:29:08 +0900684 pr->performance = per_cpu_ptr(performance, i);
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800685 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500686 if (acpi_processor_get_psd(pr)) {
687 retval = -EINVAL;
688 continue;
689 }
690 }
691 if (retval)
692 goto err_ret;
693
694 /*
695 * Now that we have _PSD data from all CPUs, lets setup P-state
696 * domain info.
697 */
KAMEZAWA Hiroyuki193de0c2006-04-27 05:25:00 -0400698 for_each_possible_cpu(i) {
Mike Travis706546d2008-06-09 16:22:23 -0700699 pr = per_cpu(processors, i);
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500700 if (!pr)
701 continue;
702
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800703 if (cpumask_test_cpu(i, covered_cpus))
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500704 continue;
705
706 pdomain = &(pr->performance->domain_info);
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800707 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
708 cpumask_set_cpu(i, covered_cpus);
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500709 if (pdomain->num_processors <= 1)
710 continue;
711
712 /* Validate the Domain info */
713 count_target = pdomain->num_processors;
714 count = 1;
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400715 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500716 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400717 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
718 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
719 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500720 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500721
KAMEZAWA Hiroyuki193de0c2006-04-27 05:25:00 -0400722 for_each_possible_cpu(j) {
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500723 if (i == j)
724 continue;
725
Mike Travis706546d2008-06-09 16:22:23 -0700726 match_pr = per_cpu(processors, j);
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500727 if (!match_pr)
728 continue;
729
730 match_pdomain = &(match_pr->performance->domain_info);
731 if (match_pdomain->domain != pdomain->domain)
732 continue;
733
734 /* Here i and j are in the same domain */
735
736 if (match_pdomain->num_processors != count_target) {
737 retval = -EINVAL;
738 goto err_ret;
739 }
740
741 if (pdomain->coord_type != match_pdomain->coord_type) {
742 retval = -EINVAL;
743 goto err_ret;
744 }
745
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800746 cpumask_set_cpu(j, covered_cpus);
747 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500748 count++;
749 }
750
KAMEZAWA Hiroyuki193de0c2006-04-27 05:25:00 -0400751 for_each_possible_cpu(j) {
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500752 if (i == j)
753 continue;
754
Mike Travis706546d2008-06-09 16:22:23 -0700755 match_pr = per_cpu(processors, j);
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500756 if (!match_pr)
757 continue;
758
759 match_pdomain = &(match_pr->performance->domain_info);
760 if (match_pdomain->domain != pdomain->domain)
761 continue;
762
763 match_pr->performance->shared_type =
764 pr->performance->shared_type;
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800765 cpumask_copy(match_pr->performance->shared_cpu_map,
766 pr->performance->shared_cpu_map);
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500767 }
768 }
769
770err_ret:
KAMEZAWA Hiroyuki193de0c2006-04-27 05:25:00 -0400771 for_each_possible_cpu(i) {
Mike Travis706546d2008-06-09 16:22:23 -0700772 pr = per_cpu(processors, i);
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500773 if (!pr || !pr->performance)
774 continue;
775
776 /* Assume no coordination on any error parsing domain info */
777 if (retval) {
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800778 cpumask_clear(pr->performance->shared_cpu_map);
779 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500780 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
781 }
782 pr->performance = NULL; /* Will be set for real in register */
783 }
784
Stanislaw Gruszkae1eb4772009-03-24 13:41:59 +0100785err_out:
Len Brown785fccc2006-06-15 22:19:31 -0400786 mutex_unlock(&performance_mutex);
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800787 free_cpumask_var(covered_cpus);
Len Brown9011bff42006-05-11 00:28:12 -0400788 return retval;
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500789}
790EXPORT_SYMBOL(acpi_processor_preregister_performance);
791
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792int
Len Brown4be44fc2005-08-05 00:44:28 -0400793acpi_processor_register_performance(struct acpi_processor_performance
794 *performance, unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795{
796 struct acpi_processor *pr;
797
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
Patrick Mocheld550d982006-06-27 00:41:40 -0400799 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Arjan van de Ven65c19bb2006-04-27 05:25:00 -0400801 mutex_lock(&performance_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802
Mike Travis706546d2008-06-09 16:22:23 -0700803 pr = per_cpu(processors, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 if (!pr) {
Arjan van de Ven65c19bb2006-04-27 05:25:00 -0400805 mutex_unlock(&performance_mutex);
Patrick Mocheld550d982006-06-27 00:41:40 -0400806 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 }
808
809 if (pr->performance) {
Arjan van de Ven65c19bb2006-04-27 05:25:00 -0400810 mutex_unlock(&performance_mutex);
Patrick Mocheld550d982006-06-27 00:41:40 -0400811 return -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 }
813
Andrew Mortona913f502006-06-10 09:54:13 -0700814 WARN_ON(!performance);
815
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 pr->performance = performance;
817
818 if (acpi_processor_get_performance_info(pr)) {
819 pr->performance = NULL;
Arjan van de Ven65c19bb2006-04-27 05:25:00 -0400820 mutex_unlock(&performance_mutex);
Patrick Mocheld550d982006-06-27 00:41:40 -0400821 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 }
823
Arjan van de Ven65c19bb2006-04-27 05:25:00 -0400824 mutex_unlock(&performance_mutex);
Patrick Mocheld550d982006-06-27 00:41:40 -0400825 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826}
Len Brown4be44fc2005-08-05 00:44:28 -0400827
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828EXPORT_SYMBOL(acpi_processor_register_performance);
829
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830void
Len Brown4be44fc2005-08-05 00:44:28 -0400831acpi_processor_unregister_performance(struct acpi_processor_performance
832 *performance, unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833{
834 struct acpi_processor *pr;
835
Arjan van de Ven65c19bb2006-04-27 05:25:00 -0400836 mutex_lock(&performance_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837
Mike Travis706546d2008-06-09 16:22:23 -0700838 pr = per_cpu(processors, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 if (!pr) {
Arjan van de Ven65c19bb2006-04-27 05:25:00 -0400840 mutex_unlock(&performance_mutex);
Patrick Mocheld550d982006-06-27 00:41:40 -0400841 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 }
843
Andrew Mortona913f502006-06-10 09:54:13 -0700844 if (pr->performance)
845 kfree(pr->performance->states);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 pr->performance = NULL;
847
Arjan van de Ven65c19bb2006-04-27 05:25:00 -0400848 mutex_unlock(&performance_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
Patrick Mocheld550d982006-06-27 00:41:40 -0400850 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851}
Len Brown4be44fc2005-08-05 00:44:28 -0400852
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853EXPORT_SYMBOL(acpi_processor_unregister_performance);