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1da177e4 LT |
1 | /* |
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 | ||
29 | ||
30 | #include <linux/kernel.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/cpufreq.h> | |
34 | ||
35 | #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF | |
36 | #include <linux/proc_fs.h> | |
37 | #include <linux/seq_file.h> | |
38 | ||
39 | #include <asm/uaccess.h> | |
40 | #endif | |
41 | ||
42 | #include <acpi/acpi_bus.h> | |
43 | #include <acpi/processor.h> | |
44 | ||
45 | ||
46 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 | |
47 | #define ACPI_PROCESSOR_CLASS "processor" | |
48 | #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" | |
49 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" | |
50 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
51 | ACPI_MODULE_NAME ("acpi_processor") | |
52 | ||
53 | ||
54 | static DECLARE_MUTEX(performance_sem); | |
55 | ||
56 | /* | |
57 | * _PPC support is implemented as a CPUfreq policy notifier: | |
58 | * This means each time a CPUfreq driver registered also with | |
59 | * the ACPI core is asked to change the speed policy, the maximum | |
60 | * value is adjusted so that it is within the platform limit. | |
61 | * | |
62 | * Also, when a new platform limit value is detected, the CPUfreq | |
63 | * policy is adjusted accordingly. | |
64 | */ | |
65 | ||
66 | #define PPC_REGISTERED 1 | |
67 | #define PPC_IN_USE 2 | |
68 | ||
69 | static int acpi_processor_ppc_status = 0; | |
70 | ||
71 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
72 | unsigned long event, | |
73 | void *data) | |
74 | { | |
75 | struct cpufreq_policy *policy = data; | |
76 | struct acpi_processor *pr; | |
77 | unsigned int ppc = 0; | |
78 | ||
79 | down(&performance_sem); | |
80 | ||
81 | if (event != CPUFREQ_INCOMPATIBLE) | |
82 | goto out; | |
83 | ||
84 | pr = processors[policy->cpu]; | |
85 | if (!pr || !pr->performance) | |
86 | goto out; | |
87 | ||
88 | ppc = (unsigned int) pr->performance_platform_limit; | |
89 | if (!ppc) | |
90 | goto out; | |
91 | ||
92 | if (ppc > pr->performance->state_count) | |
93 | goto out; | |
94 | ||
95 | cpufreq_verify_within_limits(policy, 0, | |
96 | pr->performance->states[ppc].core_frequency * 1000); | |
97 | ||
98 | out: | |
99 | up(&performance_sem); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | ||
105 | static struct notifier_block acpi_ppc_notifier_block = { | |
106 | .notifier_call = acpi_processor_ppc_notifier, | |
107 | }; | |
108 | ||
109 | ||
110 | static int | |
111 | acpi_processor_get_platform_limit ( | |
112 | struct acpi_processor* pr) | |
113 | { | |
114 | acpi_status status = 0; | |
115 | unsigned long ppc = 0; | |
116 | ||
117 | ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit"); | |
118 | ||
119 | if (!pr) | |
120 | return_VALUE(-EINVAL); | |
121 | ||
122 | /* | |
123 | * _PPC indicates the maximum state currently supported by the platform | |
124 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
125 | */ | |
126 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
127 | ||
128 | if (status != AE_NOT_FOUND) | |
129 | acpi_processor_ppc_status |= PPC_IN_USE; | |
130 | ||
131 | if(ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
132 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PPC\n")); | |
133 | return_VALUE(-ENODEV); | |
134 | } | |
135 | ||
136 | pr->performance_platform_limit = (int) ppc; | |
137 | ||
138 | return_VALUE(0); | |
139 | } | |
140 | ||
141 | ||
142 | int acpi_processor_ppc_has_changed( | |
143 | struct acpi_processor *pr) | |
144 | { | |
145 | int ret = acpi_processor_get_platform_limit(pr); | |
146 | if (ret < 0) | |
147 | return (ret); | |
148 | else | |
149 | return cpufreq_update_policy(pr->id); | |
150 | } | |
151 | ||
152 | ||
153 | void acpi_processor_ppc_init(void) { | |
154 | if (!cpufreq_register_notifier(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
155 | acpi_processor_ppc_status |= PPC_REGISTERED; | |
156 | else | |
157 | printk(KERN_DEBUG "Warning: Processor Platform Limit not supported.\n"); | |
158 | } | |
159 | ||
160 | ||
161 | void acpi_processor_ppc_exit(void) { | |
162 | if (acpi_processor_ppc_status & PPC_REGISTERED) | |
163 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER); | |
164 | ||
165 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
166 | } | |
167 | ||
168 | /* | |
169 | * when registering a cpufreq driver with this ACPI processor driver, the | |
170 | * _PCT and _PSS structures are read out and written into struct | |
171 | * acpi_processor_performance. | |
172 | */ | |
173 | static int acpi_processor_set_pdc (struct acpi_processor *pr) | |
174 | { | |
175 | acpi_status status = AE_OK; | |
176 | u32 arg0_buf[3]; | |
177 | union acpi_object arg0 = {ACPI_TYPE_BUFFER}; | |
178 | struct acpi_object_list no_object = {1, &arg0}; | |
179 | struct acpi_object_list *pdc; | |
180 | ||
181 | ACPI_FUNCTION_TRACE("acpi_processor_set_pdc"); | |
182 | ||
183 | arg0.buffer.length = 12; | |
184 | arg0.buffer.pointer = (u8 *) arg0_buf; | |
185 | arg0_buf[0] = ACPI_PDC_REVISION_ID; | |
186 | arg0_buf[1] = 0; | |
187 | arg0_buf[2] = 0; | |
188 | ||
189 | pdc = (pr->performance->pdc) ? pr->performance->pdc : &no_object; | |
190 | ||
191 | status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL); | |
192 | ||
193 | if ((ACPI_FAILURE(status)) && (pr->performance->pdc)) | |
194 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Error evaluating _PDC, using legacy perf. control...\n")); | |
195 | ||
196 | return_VALUE(status); | |
197 | } | |
198 | ||
199 | ||
200 | static int | |
201 | acpi_processor_get_performance_control ( | |
202 | struct acpi_processor *pr) | |
203 | { | |
204 | int result = 0; | |
205 | acpi_status status = 0; | |
206 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
207 | union acpi_object *pct = NULL; | |
208 | union acpi_object obj = {0}; | |
209 | ||
210 | ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control"); | |
211 | ||
212 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
213 | if(ACPI_FAILURE(status)) { | |
214 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PCT\n")); | |
215 | return_VALUE(-ENODEV); | |
216 | } | |
217 | ||
218 | pct = (union acpi_object *) buffer.pointer; | |
219 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) | |
220 | || (pct->package.count != 2)) { | |
221 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PCT data\n")); | |
222 | result = -EFAULT; | |
223 | goto end; | |
224 | } | |
225 | ||
226 | /* | |
227 | * control_register | |
228 | */ | |
229 | ||
230 | obj = pct->package.elements[0]; | |
231 | ||
232 | if ((obj.type != ACPI_TYPE_BUFFER) | |
233 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) | |
234 | || (obj.buffer.pointer == NULL)) { | |
235 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
236 | "Invalid _PCT data (control_register)\n")); | |
237 | result = -EFAULT; | |
238 | goto end; | |
239 | } | |
240 | memcpy(&pr->performance->control_register, obj.buffer.pointer, sizeof(struct acpi_pct_register)); | |
241 | ||
242 | ||
243 | /* | |
244 | * status_register | |
245 | */ | |
246 | ||
247 | obj = pct->package.elements[1]; | |
248 | ||
249 | if ((obj.type != ACPI_TYPE_BUFFER) | |
250 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) | |
251 | || (obj.buffer.pointer == NULL)) { | |
252 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
253 | "Invalid _PCT data (status_register)\n")); | |
254 | result = -EFAULT; | |
255 | goto end; | |
256 | } | |
257 | ||
258 | memcpy(&pr->performance->status_register, obj.buffer.pointer, sizeof(struct acpi_pct_register)); | |
259 | ||
260 | end: | |
261 | acpi_os_free(buffer.pointer); | |
262 | ||
263 | return_VALUE(result); | |
264 | } | |
265 | ||
266 | ||
267 | static int | |
268 | acpi_processor_get_performance_states ( | |
269 | struct acpi_processor *pr) | |
270 | { | |
271 | int result = 0; | |
272 | acpi_status status = AE_OK; | |
273 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
274 | struct acpi_buffer format = {sizeof("NNNNNN"), "NNNNNN"}; | |
275 | struct acpi_buffer state = {0, NULL}; | |
276 | union acpi_object *pss = NULL; | |
277 | int i; | |
278 | ||
279 | ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states"); | |
280 | ||
281 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
282 | if(ACPI_FAILURE(status)) { | |
283 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PSS\n")); | |
284 | return_VALUE(-ENODEV); | |
285 | } | |
286 | ||
287 | pss = (union acpi_object *) buffer.pointer; | |
288 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { | |
289 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n")); | |
290 | result = -EFAULT; | |
291 | goto end; | |
292 | } | |
293 | ||
294 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
295 | pss->package.count)); | |
296 | ||
297 | pr->performance->state_count = pss->package.count; | |
298 | pr->performance->states = kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, GFP_KERNEL); | |
299 | if (!pr->performance->states) { | |
300 | result = -ENOMEM; | |
301 | goto end; | |
302 | } | |
303 | ||
304 | for (i = 0; i < pr->performance->state_count; i++) { | |
305 | ||
306 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
307 | ||
308 | state.length = sizeof(struct acpi_processor_px); | |
309 | state.pointer = px; | |
310 | ||
311 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
312 | ||
313 | status = acpi_extract_package(&(pss->package.elements[i]), | |
314 | &format, &state); | |
315 | if (ACPI_FAILURE(status)) { | |
316 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n")); | |
317 | result = -EFAULT; | |
318 | kfree(pr->performance->states); | |
319 | goto end; | |
320 | } | |
321 | ||
322 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
323 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", | |
324 | i, | |
325 | (u32) px->core_frequency, | |
326 | (u32) px->power, | |
327 | (u32) px->transition_latency, | |
328 | (u32) px->bus_master_latency, | |
329 | (u32) px->control, | |
330 | (u32) px->status)); | |
331 | ||
332 | if (!px->core_frequency) { | |
333 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data: freq is zero\n")); | |
334 | result = -EFAULT; | |
335 | kfree(pr->performance->states); | |
336 | goto end; | |
337 | } | |
338 | } | |
339 | ||
340 | end: | |
341 | acpi_os_free(buffer.pointer); | |
342 | ||
343 | return_VALUE(result); | |
344 | } | |
345 | ||
346 | ||
347 | static int | |
348 | acpi_processor_get_performance_info ( | |
349 | struct acpi_processor *pr) | |
350 | { | |
351 | int result = 0; | |
352 | acpi_status status = AE_OK; | |
353 | acpi_handle handle = NULL; | |
354 | ||
355 | ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info"); | |
356 | ||
357 | if (!pr || !pr->performance || !pr->handle) | |
358 | return_VALUE(-EINVAL); | |
359 | ||
360 | acpi_processor_set_pdc(pr); | |
361 | ||
362 | status = acpi_get_handle(pr->handle, "_PCT", &handle); | |
363 | if (ACPI_FAILURE(status)) { | |
364 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
365 | "ACPI-based processor performance control unavailable\n")); | |
366 | return_VALUE(-ENODEV); | |
367 | } | |
368 | ||
369 | result = acpi_processor_get_performance_control(pr); | |
370 | if (result) | |
371 | return_VALUE(result); | |
372 | ||
373 | result = acpi_processor_get_performance_states(pr); | |
374 | if (result) | |
375 | return_VALUE(result); | |
376 | ||
377 | result = acpi_processor_get_platform_limit(pr); | |
378 | if (result) | |
379 | return_VALUE(result); | |
380 | ||
381 | return_VALUE(0); | |
382 | } | |
383 | ||
384 | ||
385 | int acpi_processor_notify_smm(struct module *calling_module) { | |
386 | acpi_status status; | |
387 | static int is_done = 0; | |
388 | ||
389 | ACPI_FUNCTION_TRACE("acpi_processor_notify_smm"); | |
390 | ||
391 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
392 | return_VALUE(-EBUSY); | |
393 | ||
394 | if (!try_module_get(calling_module)) | |
395 | return_VALUE(-EINVAL); | |
396 | ||
397 | /* is_done is set to negative if an error occured, | |
398 | * and to postitive if _no_ error occured, but SMM | |
399 | * was already notified. This avoids double notification | |
400 | * which might lead to unexpected results... | |
401 | */ | |
402 | if (is_done > 0) { | |
403 | module_put(calling_module); | |
404 | return_VALUE(0); | |
405 | } | |
406 | else if (is_done < 0) { | |
407 | module_put(calling_module); | |
408 | return_VALUE(is_done); | |
409 | } | |
410 | ||
411 | is_done = -EIO; | |
412 | ||
413 | /* Can't write pstate_cnt to smi_cmd if either value is zero */ | |
414 | if ((!acpi_fadt.smi_cmd) || | |
415 | (!acpi_fadt.pstate_cnt)) { | |
416 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
417 | "No SMI port or pstate_cnt\n")); | |
418 | module_put(calling_module); | |
419 | return_VALUE(0); | |
420 | } | |
421 | ||
422 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd)); | |
423 | ||
424 | /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use | |
425 | * it anyway, so we need to support it... */ | |
426 | if (acpi_fadt_is_v1) { | |
427 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Using v1.0 FADT reserved value for pstate_cnt\n")); | |
428 | } | |
429 | ||
430 | status = acpi_os_write_port (acpi_fadt.smi_cmd, | |
431 | (u32) acpi_fadt.pstate_cnt, 8); | |
432 | if (ACPI_FAILURE (status)) { | |
433 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
434 | "Failed to write pstate_cnt [0x%x] to " | |
435 | "smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd)); | |
436 | module_put(calling_module); | |
437 | return_VALUE(status); | |
438 | } | |
439 | ||
440 | /* Success. If there's no _PPC, we need to fear nothing, so | |
441 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
442 | is_done = 1; | |
443 | ||
444 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
445 | module_put(calling_module); | |
446 | ||
447 | return_VALUE(0); | |
448 | } | |
449 | EXPORT_SYMBOL(acpi_processor_notify_smm); | |
450 | ||
451 | ||
452 | #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF | |
453 | /* /proc/acpi/processor/../performance interface (DEPRECATED) */ | |
454 | ||
455 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file); | |
456 | static struct file_operations acpi_processor_perf_fops = { | |
457 | .open = acpi_processor_perf_open_fs, | |
458 | .read = seq_read, | |
459 | .llseek = seq_lseek, | |
460 | .release = single_release, | |
461 | }; | |
462 | ||
463 | static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset) | |
464 | { | |
465 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; | |
466 | int i; | |
467 | ||
468 | ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show"); | |
469 | ||
470 | if (!pr) | |
471 | goto end; | |
472 | ||
473 | if (!pr->performance) { | |
474 | seq_puts(seq, "<not supported>\n"); | |
475 | goto end; | |
476 | } | |
477 | ||
478 | seq_printf(seq, "state count: %d\n" | |
479 | "active state: P%d\n", | |
480 | pr->performance->state_count, | |
481 | pr->performance->state); | |
482 | ||
483 | seq_puts(seq, "states:\n"); | |
484 | for (i = 0; i < pr->performance->state_count; i++) | |
485 | seq_printf(seq, " %cP%d: %d MHz, %d mW, %d uS\n", | |
486 | (i == pr->performance->state?'*':' '), i, | |
487 | (u32) pr->performance->states[i].core_frequency, | |
488 | (u32) pr->performance->states[i].power, | |
489 | (u32) pr->performance->states[i].transition_latency); | |
490 | ||
491 | end: | |
492 | return_VALUE(0); | |
493 | } | |
494 | ||
495 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file) | |
496 | { | |
497 | return single_open(file, acpi_processor_perf_seq_show, | |
498 | PDE(inode)->data); | |
499 | } | |
500 | ||
501 | static ssize_t | |
502 | acpi_processor_write_performance ( | |
503 | struct file *file, | |
504 | const char __user *buffer, | |
505 | size_t count, | |
506 | loff_t *data) | |
507 | { | |
508 | int result = 0; | |
509 | struct seq_file *m = (struct seq_file *) file->private_data; | |
510 | struct acpi_processor *pr = (struct acpi_processor *) m->private; | |
511 | struct acpi_processor_performance *perf; | |
512 | char state_string[12] = {'\0'}; | |
513 | unsigned int new_state = 0; | |
514 | struct cpufreq_policy policy; | |
515 | ||
516 | ACPI_FUNCTION_TRACE("acpi_processor_write_performance"); | |
517 | ||
518 | if (!pr || (count > sizeof(state_string) - 1)) | |
519 | return_VALUE(-EINVAL); | |
520 | ||
521 | perf = pr->performance; | |
522 | if (!perf) | |
523 | return_VALUE(-EINVAL); | |
524 | ||
525 | if (copy_from_user(state_string, buffer, count)) | |
526 | return_VALUE(-EFAULT); | |
527 | ||
528 | state_string[count] = '\0'; | |
529 | new_state = simple_strtoul(state_string, NULL, 0); | |
530 | ||
531 | if (new_state >= perf->state_count) | |
532 | return_VALUE(-EINVAL); | |
533 | ||
534 | cpufreq_get_policy(&policy, pr->id); | |
535 | ||
536 | policy.cpu = pr->id; | |
537 | policy.min = perf->states[new_state].core_frequency * 1000; | |
538 | policy.max = perf->states[new_state].core_frequency * 1000; | |
539 | ||
540 | result = cpufreq_set_policy(&policy); | |
541 | if (result) | |
542 | return_VALUE(result); | |
543 | ||
544 | return_VALUE(count); | |
545 | } | |
546 | ||
547 | static void | |
548 | acpi_cpufreq_add_file ( | |
549 | struct acpi_processor *pr) | |
550 | { | |
551 | struct proc_dir_entry *entry = NULL; | |
552 | struct acpi_device *device = NULL; | |
553 | ||
554 | ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile"); | |
555 | ||
556 | if (acpi_bus_get_device(pr->handle, &device)) | |
557 | return_VOID; | |
558 | ||
559 | /* add file 'performance' [R/W] */ | |
560 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, | |
561 | S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device)); | |
562 | if (!entry) | |
563 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
564 | "Unable to create '%s' fs entry\n", | |
565 | ACPI_PROCESSOR_FILE_PERFORMANCE)); | |
566 | else { | |
567 | entry->proc_fops = &acpi_processor_perf_fops; | |
568 | entry->proc_fops->write = acpi_processor_write_performance; | |
569 | entry->data = acpi_driver_data(device); | |
570 | entry->owner = THIS_MODULE; | |
571 | } | |
572 | return_VOID; | |
573 | } | |
574 | ||
575 | static void | |
576 | acpi_cpufreq_remove_file ( | |
577 | struct acpi_processor *pr) | |
578 | { | |
579 | struct acpi_device *device = NULL; | |
580 | ||
581 | ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile"); | |
582 | ||
583 | if (acpi_bus_get_device(pr->handle, &device)) | |
584 | return_VOID; | |
585 | ||
586 | /* remove file 'performance' */ | |
587 | remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, | |
588 | acpi_device_dir(device)); | |
589 | ||
590 | return_VOID; | |
591 | } | |
592 | ||
593 | #else | |
594 | static void acpi_cpufreq_add_file (struct acpi_processor *pr) { return; } | |
595 | static void acpi_cpufreq_remove_file (struct acpi_processor *pr) { return; } | |
596 | #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */ | |
597 | ||
598 | ||
599 | int | |
600 | acpi_processor_register_performance ( | |
601 | struct acpi_processor_performance * performance, | |
602 | unsigned int cpu) | |
603 | { | |
604 | struct acpi_processor *pr; | |
605 | ||
606 | ACPI_FUNCTION_TRACE("acpi_processor_register_performance"); | |
607 | ||
608 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
609 | return_VALUE(-EINVAL); | |
610 | ||
611 | down(&performance_sem); | |
612 | ||
613 | pr = processors[cpu]; | |
614 | if (!pr) { | |
615 | up(&performance_sem); | |
616 | return_VALUE(-ENODEV); | |
617 | } | |
618 | ||
619 | if (pr->performance) { | |
620 | up(&performance_sem); | |
621 | return_VALUE(-EBUSY); | |
622 | } | |
623 | ||
624 | pr->performance = performance; | |
625 | ||
626 | if (acpi_processor_get_performance_info(pr)) { | |
627 | pr->performance = NULL; | |
628 | up(&performance_sem); | |
629 | return_VALUE(-EIO); | |
630 | } | |
631 | ||
632 | acpi_cpufreq_add_file(pr); | |
633 | ||
634 | up(&performance_sem); | |
635 | return_VALUE(0); | |
636 | } | |
637 | EXPORT_SYMBOL(acpi_processor_register_performance); | |
638 | ||
639 | ||
640 | void | |
641 | acpi_processor_unregister_performance ( | |
642 | struct acpi_processor_performance * performance, | |
643 | unsigned int cpu) | |
644 | { | |
645 | struct acpi_processor *pr; | |
646 | ||
647 | ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance"); | |
648 | ||
649 | down(&performance_sem); | |
650 | ||
651 | pr = processors[cpu]; | |
652 | if (!pr) { | |
653 | up(&performance_sem); | |
654 | return_VOID; | |
655 | } | |
656 | ||
657 | kfree(pr->performance->states); | |
658 | pr->performance = NULL; | |
659 | ||
660 | acpi_cpufreq_remove_file(pr); | |
661 | ||
662 | up(&performance_sem); | |
663 | ||
664 | return_VOID; | |
665 | } | |
666 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |