blob: abbdb37a7f5f37e062f58800318d66b67a37c5d1 [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>
33
34#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
35#include <linux/proc_fs.h>
36#include <linux/seq_file.h>
37
38#include <asm/uaccess.h>
39#endif
40
41#include <acpi/acpi_bus.h>
42#include <acpi/processor.h>
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#define ACPI_PROCESSOR_COMPONENT 0x01000000
45#define ACPI_PROCESSOR_CLASS "processor"
46#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
47#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
48#define _COMPONENT ACPI_PROCESSOR_COMPONENT
Len Brown4be44fc2005-08-05 00:44:28 -040049ACPI_MODULE_NAME("acpi_processor")
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51static DECLARE_MUTEX(performance_sem);
52
53/*
54 * _PPC support is implemented as a CPUfreq policy notifier:
55 * This means each time a CPUfreq driver registered also with
56 * the ACPI core is asked to change the speed policy, the maximum
57 * value is adjusted so that it is within the platform limit.
58 *
59 * Also, when a new platform limit value is detected, the CPUfreq
60 * policy is adjusted accordingly.
61 */
62
63#define PPC_REGISTERED 1
64#define PPC_IN_USE 2
65
66static int acpi_processor_ppc_status = 0;
67
68static int acpi_processor_ppc_notifier(struct notifier_block *nb,
Len Brown4be44fc2005-08-05 00:44:28 -040069 unsigned long event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
71 struct cpufreq_policy *policy = data;
72 struct acpi_processor *pr;
73 unsigned int ppc = 0;
74
75 down(&performance_sem);
76
77 if (event != CPUFREQ_INCOMPATIBLE)
78 goto out;
79
80 pr = processors[policy->cpu];
81 if (!pr || !pr->performance)
82 goto out;
83
Len Brown4be44fc2005-08-05 00:44:28 -040084 ppc = (unsigned int)pr->performance_platform_limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 if (!ppc)
86 goto out;
87
88 if (ppc > pr->performance->state_count)
89 goto out;
90
91 cpufreq_verify_within_limits(policy, 0,
Len Brown4be44fc2005-08-05 00:44:28 -040092 pr->performance->states[ppc].
93 core_frequency * 1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Len Brown4be44fc2005-08-05 00:44:28 -040095 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 up(&performance_sem);
97
98 return 0;
99}
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101static struct notifier_block acpi_ppc_notifier_block = {
102 .notifier_call = acpi_processor_ppc_notifier,
103};
104
Len Brown4be44fc2005-08-05 00:44:28 -0400105static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106{
Len Brown4be44fc2005-08-05 00:44:28 -0400107 acpi_status status = 0;
108 unsigned long ppc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110 ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit");
111
112 if (!pr)
113 return_VALUE(-EINVAL);
114
115 /*
116 * _PPC indicates the maximum state currently supported by the platform
117 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
118 */
119 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
120
121 if (status != AE_NOT_FOUND)
122 acpi_processor_ppc_status |= PPC_IN_USE;
123
Len Brown4be44fc2005-08-05 00:44:28 -0400124 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PPC\n"));
126 return_VALUE(-ENODEV);
127 }
128
Len Brown4be44fc2005-08-05 00:44:28 -0400129 pr->performance_platform_limit = (int)ppc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131 return_VALUE(0);
132}
133
Len Brown4be44fc2005-08-05 00:44:28 -0400134int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
136 int ret = acpi_processor_get_platform_limit(pr);
137 if (ret < 0)
138 return (ret);
139 else
140 return cpufreq_update_policy(pr->id);
141}
142
Len Brown4be44fc2005-08-05 00:44:28 -0400143void acpi_processor_ppc_init(void)
144{
145 if (!cpufreq_register_notifier
146 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 acpi_processor_ppc_status |= PPC_REGISTERED;
148 else
Len Brown4be44fc2005-08-05 00:44:28 -0400149 printk(KERN_DEBUG
150 "Warning: Processor Platform Limit not supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151}
152
Len Brown4be44fc2005-08-05 00:44:28 -0400153void acpi_processor_ppc_exit(void)
154{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 if (acpi_processor_ppc_status & PPC_REGISTERED)
Len Brown4be44fc2005-08-05 00:44:28 -0400156 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
157 CPUFREQ_POLICY_NOTIFIER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159 acpi_processor_ppc_status &= ~PPC_REGISTERED;
160}
161
Len Brown4be44fc2005-08-05 00:44:28 -0400162static int acpi_processor_get_performance_control(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163{
Len Brown4be44fc2005-08-05 00:44:28 -0400164 int result = 0;
165 acpi_status status = 0;
166 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
167 union acpi_object *pct = NULL;
168 union acpi_object obj = { 0 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control");
171
172 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
Len Brown4be44fc2005-08-05 00:44:28 -0400173 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PCT\n"));
175 return_VALUE(-ENODEV);
176 }
177
Len Brown4be44fc2005-08-05 00:44:28 -0400178 pct = (union acpi_object *)buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
Len Brown4be44fc2005-08-05 00:44:28 -0400180 || (pct->package.count != 2)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PCT data\n"));
182 result = -EFAULT;
183 goto end;
184 }
185
186 /*
187 * control_register
188 */
189
190 obj = pct->package.elements[0];
191
192 if ((obj.type != ACPI_TYPE_BUFFER)
Len Brown4be44fc2005-08-05 00:44:28 -0400193 || (obj.buffer.length < sizeof(struct acpi_pct_register))
194 || (obj.buffer.pointer == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
Len Brown4be44fc2005-08-05 00:44:28 -0400196 "Invalid _PCT data (control_register)\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 result = -EFAULT;
198 goto end;
199 }
Len Brown4be44fc2005-08-05 00:44:28 -0400200 memcpy(&pr->performance->control_register, obj.buffer.pointer,
201 sizeof(struct acpi_pct_register));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203 /*
204 * status_register
205 */
206
207 obj = pct->package.elements[1];
208
209 if ((obj.type != ACPI_TYPE_BUFFER)
Len Brown4be44fc2005-08-05 00:44:28 -0400210 || (obj.buffer.length < sizeof(struct acpi_pct_register))
211 || (obj.buffer.pointer == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
Len Brown4be44fc2005-08-05 00:44:28 -0400213 "Invalid _PCT data (status_register)\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 result = -EFAULT;
215 goto end;
216 }
217
Len Brown4be44fc2005-08-05 00:44:28 -0400218 memcpy(&pr->performance->status_register, obj.buffer.pointer,
219 sizeof(struct acpi_pct_register));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Len Brown4be44fc2005-08-05 00:44:28 -0400221 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 acpi_os_free(buffer.pointer);
223
224 return_VALUE(result);
225}
226
Len Brown4be44fc2005-08-05 00:44:28 -0400227static int acpi_processor_get_performance_states(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
Len Brown4be44fc2005-08-05 00:44:28 -0400229 int result = 0;
230 acpi_status status = AE_OK;
231 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
232 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
233 struct acpi_buffer state = { 0, NULL };
234 union acpi_object *pss = NULL;
235 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states");
238
239 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
Len Brown4be44fc2005-08-05 00:44:28 -0400240 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PSS\n"));
242 return_VALUE(-ENODEV);
243 }
244
Len Brown4be44fc2005-08-05 00:44:28 -0400245 pss = (union acpi_object *)buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
247 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
248 result = -EFAULT;
249 goto end;
250 }
251
252 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400253 pss->package.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
255 pr->performance->state_count = pss->package.count;
Len Brown4be44fc2005-08-05 00:44:28 -0400256 pr->performance->states =
257 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
258 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 if (!pr->performance->states) {
260 result = -ENOMEM;
261 goto end;
262 }
263
264 for (i = 0; i < pr->performance->state_count; i++) {
265
266 struct acpi_processor_px *px = &(pr->performance->states[i]);
267
268 state.length = sizeof(struct acpi_processor_px);
269 state.pointer = px;
270
271 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
272
273 status = acpi_extract_package(&(pss->package.elements[i]),
Len Brown4be44fc2005-08-05 00:44:28 -0400274 &format, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400276 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
277 "Invalid _PSS data\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 result = -EFAULT;
279 kfree(pr->performance->states);
280 goto end;
281 }
282
283 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400284 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
285 i,
286 (u32) px->core_frequency,
287 (u32) px->power,
288 (u32) px->transition_latency,
289 (u32) px->bus_master_latency,
290 (u32) px->control, (u32) px->status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 if (!px->core_frequency) {
Len Brown4be44fc2005-08-05 00:44:28 -0400293 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
294 "Invalid _PSS data: freq is zero\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 result = -EFAULT;
296 kfree(pr->performance->states);
297 goto end;
298 }
299 }
300
Len Brown4be44fc2005-08-05 00:44:28 -0400301 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 acpi_os_free(buffer.pointer);
303
304 return_VALUE(result);
305}
306
Len Brown4be44fc2005-08-05 00:44:28 -0400307static int acpi_processor_get_performance_info(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308{
Len Brown4be44fc2005-08-05 00:44:28 -0400309 int result = 0;
310 acpi_status status = AE_OK;
311 acpi_handle handle = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
313 ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info");
314
315 if (!pr || !pr->performance || !pr->handle)
316 return_VALUE(-EINVAL);
317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 status = acpi_get_handle(pr->handle, "_PCT", &handle);
319 if (ACPI_FAILURE(status)) {
320 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400321 "ACPI-based processor performance control unavailable\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 return_VALUE(-ENODEV);
323 }
324
325 result = acpi_processor_get_performance_control(pr);
326 if (result)
327 return_VALUE(result);
328
329 result = acpi_processor_get_performance_states(pr);
330 if (result)
331 return_VALUE(result);
332
333 result = acpi_processor_get_platform_limit(pr);
334 if (result)
335 return_VALUE(result);
336
337 return_VALUE(0);
338}
339
Len Brown4be44fc2005-08-05 00:44:28 -0400340int acpi_processor_notify_smm(struct module *calling_module)
341{
342 acpi_status status;
343 static int is_done = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
345 ACPI_FUNCTION_TRACE("acpi_processor_notify_smm");
346
347 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
348 return_VALUE(-EBUSY);
349
350 if (!try_module_get(calling_module))
351 return_VALUE(-EINVAL);
352
353 /* is_done is set to negative if an error occured,
354 * and to postitive if _no_ error occured, but SMM
355 * was already notified. This avoids double notification
356 * which might lead to unexpected results...
357 */
358 if (is_done > 0) {
359 module_put(calling_module);
360 return_VALUE(0);
Len Brown4be44fc2005-08-05 00:44:28 -0400361 } else if (is_done < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 module_put(calling_module);
363 return_VALUE(is_done);
364 }
365
366 is_done = -EIO;
367
368 /* Can't write pstate_cnt to smi_cmd if either value is zero */
Len Brown4be44fc2005-08-05 00:44:28 -0400369 if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) {
370 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 module_put(calling_module);
372 return_VALUE(0);
373 }
374
Len Brown4be44fc2005-08-05 00:44:28 -0400375 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
376 "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
377 acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
379 /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
380 * it anyway, so we need to support it... */
381 if (acpi_fadt_is_v1) {
Len Brown4be44fc2005-08-05 00:44:28 -0400382 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
383 "Using v1.0 FADT reserved value for pstate_cnt\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 }
385
Len Brown4be44fc2005-08-05 00:44:28 -0400386 status = acpi_os_write_port(acpi_fadt.smi_cmd,
387 (u32) acpi_fadt.pstate_cnt, 8);
388 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
390 "Failed to write pstate_cnt [0x%x] to "
Len Brown4be44fc2005-08-05 00:44:28 -0400391 "smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt,
392 acpi_fadt.smi_cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 module_put(calling_module);
394 return_VALUE(status);
395 }
396
397 /* Success. If there's no _PPC, we need to fear nothing, so
398 * we can allow the cpufreq driver to be rmmod'ed. */
399 is_done = 1;
400
401 if (!(acpi_processor_ppc_status & PPC_IN_USE))
402 module_put(calling_module);
403
404 return_VALUE(0);
405}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Len Brown4be44fc2005-08-05 00:44:28 -0400407EXPORT_SYMBOL(acpi_processor_notify_smm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
409#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
410/* /proc/acpi/processor/../performance interface (DEPRECATED) */
411
412static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
413static struct file_operations acpi_processor_perf_fops = {
Len Brown4be44fc2005-08-05 00:44:28 -0400414 .open = acpi_processor_perf_open_fs,
415 .read = seq_read,
416 .llseek = seq_lseek,
417 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418};
419
420static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
421{
Len Brown4be44fc2005-08-05 00:44:28 -0400422 struct acpi_processor *pr = (struct acpi_processor *)seq->private;
423 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425 ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show");
426
427 if (!pr)
428 goto end;
429
430 if (!pr->performance) {
431 seq_puts(seq, "<not supported>\n");
432 goto end;
433 }
434
435 seq_printf(seq, "state count: %d\n"
Len Brown4be44fc2005-08-05 00:44:28 -0400436 "active state: P%d\n",
437 pr->performance->state_count, pr->performance->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439 seq_puts(seq, "states:\n");
440 for (i = 0; i < pr->performance->state_count; i++)
Len Brown4be44fc2005-08-05 00:44:28 -0400441 seq_printf(seq,
442 " %cP%d: %d MHz, %d mW, %d uS\n",
443 (i == pr->performance->state ? '*' : ' '), i,
444 (u32) pr->performance->states[i].core_frequency,
445 (u32) pr->performance->states[i].power,
446 (u32) pr->performance->states[i].transition_latency);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Len Brown4be44fc2005-08-05 00:44:28 -0400448 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 return_VALUE(0);
450}
451
452static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
453{
454 return single_open(file, acpi_processor_perf_seq_show,
Len Brown4be44fc2005-08-05 00:44:28 -0400455 PDE(inode)->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456}
457
458static ssize_t
Len Brown4be44fc2005-08-05 00:44:28 -0400459acpi_processor_write_performance(struct file *file,
460 const char __user * buffer,
461 size_t count, loff_t * data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
Len Brown4be44fc2005-08-05 00:44:28 -0400463 int result = 0;
464 struct seq_file *m = (struct seq_file *)file->private_data;
465 struct acpi_processor *pr = (struct acpi_processor *)m->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 struct acpi_processor_performance *perf;
Len Brown4be44fc2005-08-05 00:44:28 -0400467 char state_string[12] = { '\0' };
468 unsigned int new_state = 0;
469 struct cpufreq_policy policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
471 ACPI_FUNCTION_TRACE("acpi_processor_write_performance");
472
473 if (!pr || (count > sizeof(state_string) - 1))
474 return_VALUE(-EINVAL);
475
476 perf = pr->performance;
477 if (!perf)
478 return_VALUE(-EINVAL);
479
480 if (copy_from_user(state_string, buffer, count))
481 return_VALUE(-EFAULT);
482
483 state_string[count] = '\0';
484 new_state = simple_strtoul(state_string, NULL, 0);
485
486 if (new_state >= perf->state_count)
487 return_VALUE(-EINVAL);
488
489 cpufreq_get_policy(&policy, pr->id);
490
491 policy.cpu = pr->id;
492 policy.min = perf->states[new_state].core_frequency * 1000;
493 policy.max = perf->states[new_state].core_frequency * 1000;
494
495 result = cpufreq_set_policy(&policy);
496 if (result)
497 return_VALUE(result);
498
499 return_VALUE(count);
500}
501
Len Brown4be44fc2005-08-05 00:44:28 -0400502static void acpi_cpufreq_add_file(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503{
Len Brown4be44fc2005-08-05 00:44:28 -0400504 struct proc_dir_entry *entry = NULL;
505 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
507 ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
508
509 if (acpi_bus_get_device(pr->handle, &device))
510 return_VOID;
511
512 /* add file 'performance' [R/W] */
513 entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
Len Brown4be44fc2005-08-05 00:44:28 -0400514 S_IFREG | S_IRUGO | S_IWUSR,
515 acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 if (!entry)
517 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
Len Brown4be44fc2005-08-05 00:44:28 -0400518 "Unable to create '%s' fs entry\n",
519 ACPI_PROCESSOR_FILE_PERFORMANCE));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 else {
Arjan van de Vend479e902006-01-06 16:47:00 -0500521 acpi_processor_perf_fops.write = acpi_processor_write_performance;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 entry->proc_fops = &acpi_processor_perf_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 entry->data = acpi_driver_data(device);
524 entry->owner = THIS_MODULE;
525 }
526 return_VOID;
527}
528
Len Brown4be44fc2005-08-05 00:44:28 -0400529static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530{
Len Brown4be44fc2005-08-05 00:44:28 -0400531 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
533 ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
534
535 if (acpi_bus_get_device(pr->handle, &device))
536 return_VOID;
537
538 /* remove file 'performance' */
539 remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
Len Brown4be44fc2005-08-05 00:44:28 -0400540 acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542 return_VOID;
543}
544
545#else
Len Brown4be44fc2005-08-05 00:44:28 -0400546static void acpi_cpufreq_add_file(struct acpi_processor *pr)
547{
548 return;
549}
550static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
551{
552 return;
553}
554#endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
556int
Len Brown4be44fc2005-08-05 00:44:28 -0400557acpi_processor_register_performance(struct acpi_processor_performance
558 *performance, unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559{
560 struct acpi_processor *pr;
561
562 ACPI_FUNCTION_TRACE("acpi_processor_register_performance");
563
564 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
565 return_VALUE(-EINVAL);
566
567 down(&performance_sem);
568
569 pr = processors[cpu];
570 if (!pr) {
571 up(&performance_sem);
572 return_VALUE(-ENODEV);
573 }
574
575 if (pr->performance) {
576 up(&performance_sem);
577 return_VALUE(-EBUSY);
578 }
579
580 pr->performance = performance;
581
582 if (acpi_processor_get_performance_info(pr)) {
583 pr->performance = NULL;
584 up(&performance_sem);
585 return_VALUE(-EIO);
586 }
587
588 acpi_cpufreq_add_file(pr);
589
590 up(&performance_sem);
591 return_VALUE(0);
592}
Len Brown4be44fc2005-08-05 00:44:28 -0400593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594EXPORT_SYMBOL(acpi_processor_register_performance);
595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596void
Len Brown4be44fc2005-08-05 00:44:28 -0400597acpi_processor_unregister_performance(struct acpi_processor_performance
598 *performance, unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599{
600 struct acpi_processor *pr;
601
602 ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance");
603
604 down(&performance_sem);
605
606 pr = processors[cpu];
607 if (!pr) {
608 up(&performance_sem);
609 return_VOID;
610 }
611
612 kfree(pr->performance->states);
613 pr->performance = NULL;
614
615 acpi_cpufreq_remove_file(pr);
616
617 up(&performance_sem);
618
619 return_VOID;
620}
Len Brown4be44fc2005-08-05 00:44:28 -0400621
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622EXPORT_SYMBOL(acpi_processor_unregister_performance);