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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 | ||
1da177e4 LT |
29 | #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> | |
65c19bbd | 37 | #include <linux/mutex.h> |
1da177e4 LT |
38 | |
39 | #include <asm/uaccess.h> | |
40 | #endif | |
41 | ||
42 | #include <acpi/acpi_bus.h> | |
43 | #include <acpi/processor.h> | |
44 | ||
1da177e4 LT |
45 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 |
46 | #define ACPI_PROCESSOR_CLASS "processor" | |
47 | #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" | |
48 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" | |
49 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
4be44fcd | 50 | ACPI_MODULE_NAME("acpi_processor") |
1da177e4 | 51 | |
65c19bbd | 52 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 LT |
53 | |
54 | /* | |
55 | * _PPC support is implemented as a CPUfreq policy notifier: | |
56 | * This means each time a CPUfreq driver registered also with | |
57 | * the ACPI core is asked to change the speed policy, the maximum | |
58 | * value is adjusted so that it is within the platform limit. | |
59 | * | |
60 | * Also, when a new platform limit value is detected, the CPUfreq | |
61 | * policy is adjusted accordingly. | |
62 | */ | |
63 | ||
64 | #define PPC_REGISTERED 1 | |
65 | #define PPC_IN_USE 2 | |
66 | ||
67 | static int acpi_processor_ppc_status = 0; | |
68 | ||
69 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 70 | unsigned long event, void *data) |
1da177e4 LT |
71 | { |
72 | struct cpufreq_policy *policy = data; | |
73 | struct acpi_processor *pr; | |
74 | unsigned int ppc = 0; | |
75 | ||
65c19bbd | 76 | mutex_lock(&performance_mutex); |
1da177e4 LT |
77 | |
78 | if (event != CPUFREQ_INCOMPATIBLE) | |
79 | goto out; | |
80 | ||
81 | pr = processors[policy->cpu]; | |
82 | if (!pr || !pr->performance) | |
83 | goto out; | |
84 | ||
4be44fcd | 85 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 LT |
86 | if (!ppc) |
87 | goto out; | |
88 | ||
89 | if (ppc > pr->performance->state_count) | |
90 | goto out; | |
91 | ||
92 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
93 | pr->performance->states[ppc]. |
94 | core_frequency * 1000); | |
1da177e4 | 95 | |
4be44fcd | 96 | out: |
65c19bbd | 97 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
98 | |
99 | return 0; | |
100 | } | |
101 | ||
1da177e4 LT |
102 | static struct notifier_block acpi_ppc_notifier_block = { |
103 | .notifier_call = acpi_processor_ppc_notifier, | |
104 | }; | |
105 | ||
4be44fcd | 106 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 107 | { |
4be44fcd LB |
108 | acpi_status status = 0; |
109 | unsigned long ppc = 0; | |
1da177e4 LT |
110 | |
111 | ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit"); | |
112 | ||
113 | if (!pr) | |
114 | return_VALUE(-EINVAL); | |
115 | ||
116 | /* | |
117 | * _PPC indicates the maximum state currently supported by the platform | |
118 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
119 | */ | |
120 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
121 | ||
122 | if (status != AE_NOT_FOUND) | |
123 | acpi_processor_ppc_status |= PPC_IN_USE; | |
124 | ||
4be44fcd | 125 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 126 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
1da177e4 LT |
127 | return_VALUE(-ENODEV); |
128 | } | |
129 | ||
4be44fcd | 130 | pr->performance_platform_limit = (int)ppc; |
1da177e4 LT |
131 | |
132 | return_VALUE(0); | |
133 | } | |
134 | ||
4be44fcd | 135 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr) |
1da177e4 LT |
136 | { |
137 | int ret = acpi_processor_get_platform_limit(pr); | |
138 | if (ret < 0) | |
139 | return (ret); | |
140 | else | |
141 | return cpufreq_update_policy(pr->id); | |
142 | } | |
143 | ||
4be44fcd LB |
144 | void acpi_processor_ppc_init(void) |
145 | { | |
146 | if (!cpufreq_register_notifier | |
147 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
148 | acpi_processor_ppc_status |= PPC_REGISTERED; |
149 | else | |
4be44fcd LB |
150 | printk(KERN_DEBUG |
151 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
152 | } |
153 | ||
4be44fcd LB |
154 | void acpi_processor_ppc_exit(void) |
155 | { | |
1da177e4 | 156 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
157 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
158 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
159 | |
160 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
161 | } | |
162 | ||
4be44fcd | 163 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 164 | { |
4be44fcd LB |
165 | int result = 0; |
166 | acpi_status status = 0; | |
167 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
168 | union acpi_object *pct = NULL; | |
169 | union acpi_object obj = { 0 }; | |
1da177e4 LT |
170 | |
171 | ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control"); | |
172 | ||
173 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 174 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 175 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
1da177e4 LT |
176 | return_VALUE(-ENODEV); |
177 | } | |
178 | ||
4be44fcd | 179 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 180 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 181 | || (pct->package.count != 2)) { |
a6fc6720 | 182 | ACPI_ERROR((AE_INFO, "Invalid _PCT data")); |
1da177e4 LT |
183 | result = -EFAULT; |
184 | goto end; | |
185 | } | |
186 | ||
187 | /* | |
188 | * control_register | |
189 | */ | |
190 | ||
191 | obj = pct->package.elements[0]; | |
192 | ||
193 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
194 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
195 | || (obj.buffer.pointer == NULL)) { | |
a6fc6720 | 196 | ACPI_ERROR((AE_INFO, "Invalid _PCT data (control_register)")); |
1da177e4 LT |
197 | result = -EFAULT; |
198 | goto end; | |
199 | } | |
4be44fcd LB |
200 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
201 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
202 | |
203 | /* | |
204 | * status_register | |
205 | */ | |
206 | ||
207 | obj = pct->package.elements[1]; | |
208 | ||
209 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
210 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
211 | || (obj.buffer.pointer == NULL)) { | |
a6fc6720 | 212 | ACPI_ERROR((AE_INFO, "Invalid _PCT data (status_register)")); |
1da177e4 LT |
213 | result = -EFAULT; |
214 | goto end; | |
215 | } | |
216 | ||
4be44fcd LB |
217 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
218 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 219 | |
4be44fcd | 220 | end: |
1da177e4 LT |
221 | acpi_os_free(buffer.pointer); |
222 | ||
223 | return_VALUE(result); | |
224 | } | |
225 | ||
4be44fcd | 226 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 227 | { |
4be44fcd LB |
228 | int result = 0; |
229 | acpi_status status = AE_OK; | |
230 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
231 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
232 | struct acpi_buffer state = { 0, NULL }; | |
233 | union acpi_object *pss = NULL; | |
234 | int i; | |
1da177e4 LT |
235 | |
236 | ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states"); | |
237 | ||
238 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 239 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 240 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
1da177e4 LT |
241 | return_VALUE(-ENODEV); |
242 | } | |
243 | ||
4be44fcd | 244 | pss = (union acpi_object *)buffer.pointer; |
1da177e4 | 245 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
a6fc6720 | 246 | ACPI_ERROR((AE_INFO, "Invalid _PSS data")); |
1da177e4 LT |
247 | result = -EFAULT; |
248 | goto end; | |
249 | } | |
250 | ||
251 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 252 | pss->package.count)); |
1da177e4 LT |
253 | |
254 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
255 | pr->performance->states = |
256 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
257 | GFP_KERNEL); | |
1da177e4 LT |
258 | if (!pr->performance->states) { |
259 | result = -ENOMEM; | |
260 | goto end; | |
261 | } | |
262 | ||
263 | for (i = 0; i < pr->performance->state_count; i++) { | |
264 | ||
265 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
266 | ||
267 | state.length = sizeof(struct acpi_processor_px); | |
268 | state.pointer = px; | |
269 | ||
270 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
271 | ||
272 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 273 | &format, &state); |
1da177e4 | 274 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 275 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
276 | result = -EFAULT; |
277 | kfree(pr->performance->states); | |
278 | goto end; | |
279 | } | |
280 | ||
281 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
282 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
283 | i, | |
284 | (u32) px->core_frequency, | |
285 | (u32) px->power, | |
286 | (u32) px->transition_latency, | |
287 | (u32) px->bus_master_latency, | |
288 | (u32) px->control, (u32) px->status)); | |
1da177e4 LT |
289 | |
290 | if (!px->core_frequency) { | |
a6fc6720 TR |
291 | ACPI_ERROR((AE_INFO, |
292 | "Invalid _PSS data: freq is zero")); | |
1da177e4 LT |
293 | result = -EFAULT; |
294 | kfree(pr->performance->states); | |
295 | goto end; | |
296 | } | |
297 | } | |
298 | ||
4be44fcd | 299 | end: |
1da177e4 LT |
300 | acpi_os_free(buffer.pointer); |
301 | ||
302 | return_VALUE(result); | |
303 | } | |
304 | ||
4be44fcd | 305 | static int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 306 | { |
4be44fcd LB |
307 | int result = 0; |
308 | acpi_status status = AE_OK; | |
309 | acpi_handle handle = NULL; | |
1da177e4 LT |
310 | |
311 | ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info"); | |
312 | ||
313 | if (!pr || !pr->performance || !pr->handle) | |
314 | return_VALUE(-EINVAL); | |
315 | ||
1da177e4 LT |
316 | status = acpi_get_handle(pr->handle, "_PCT", &handle); |
317 | if (ACPI_FAILURE(status)) { | |
318 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 319 | "ACPI-based processor performance control unavailable\n")); |
1da177e4 LT |
320 | return_VALUE(-ENODEV); |
321 | } | |
322 | ||
323 | result = acpi_processor_get_performance_control(pr); | |
324 | if (result) | |
325 | return_VALUE(result); | |
326 | ||
327 | result = acpi_processor_get_performance_states(pr); | |
328 | if (result) | |
329 | return_VALUE(result); | |
330 | ||
331 | result = acpi_processor_get_platform_limit(pr); | |
332 | if (result) | |
333 | return_VALUE(result); | |
334 | ||
335 | return_VALUE(0); | |
336 | } | |
337 | ||
4be44fcd LB |
338 | int acpi_processor_notify_smm(struct module *calling_module) |
339 | { | |
340 | acpi_status status; | |
341 | static int is_done = 0; | |
1da177e4 LT |
342 | |
343 | ACPI_FUNCTION_TRACE("acpi_processor_notify_smm"); | |
344 | ||
345 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
346 | return_VALUE(-EBUSY); | |
347 | ||
348 | if (!try_module_get(calling_module)) | |
349 | return_VALUE(-EINVAL); | |
350 | ||
351 | /* is_done is set to negative if an error occured, | |
352 | * and to postitive if _no_ error occured, but SMM | |
353 | * was already notified. This avoids double notification | |
354 | * which might lead to unexpected results... | |
355 | */ | |
356 | if (is_done > 0) { | |
357 | module_put(calling_module); | |
358 | return_VALUE(0); | |
4be44fcd | 359 | } else if (is_done < 0) { |
1da177e4 LT |
360 | module_put(calling_module); |
361 | return_VALUE(is_done); | |
362 | } | |
363 | ||
364 | is_done = -EIO; | |
365 | ||
366 | /* Can't write pstate_cnt to smi_cmd if either value is zero */ | |
4be44fcd LB |
367 | if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) { |
368 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n")); | |
1da177e4 LT |
369 | module_put(calling_module); |
370 | return_VALUE(0); | |
371 | } | |
372 | ||
4be44fcd LB |
373 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
374 | "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n", | |
375 | acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd)); | |
1da177e4 LT |
376 | |
377 | /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use | |
378 | * it anyway, so we need to support it... */ | |
379 | if (acpi_fadt_is_v1) { | |
4be44fcd LB |
380 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
381 | "Using v1.0 FADT reserved value for pstate_cnt\n")); | |
1da177e4 LT |
382 | } |
383 | ||
4be44fcd LB |
384 | status = acpi_os_write_port(acpi_fadt.smi_cmd, |
385 | (u32) acpi_fadt.pstate_cnt, 8); | |
386 | if (ACPI_FAILURE(status)) { | |
a6fc6720 TR |
387 | ACPI_EXCEPTION((AE_INFO, status, |
388 | "Failed to write pstate_cnt [0x%x] to " | |
389 | "smi_cmd [0x%x]", acpi_fadt.pstate_cnt, | |
390 | acpi_fadt.smi_cmd)); | |
1da177e4 LT |
391 | module_put(calling_module); |
392 | return_VALUE(status); | |
393 | } | |
394 | ||
395 | /* Success. If there's no _PPC, we need to fear nothing, so | |
396 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
397 | is_done = 1; | |
398 | ||
399 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
400 | module_put(calling_module); | |
401 | ||
402 | return_VALUE(0); | |
403 | } | |
1da177e4 | 404 | |
4be44fcd | 405 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 LT |
406 | |
407 | #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF | |
408 | /* /proc/acpi/processor/../performance interface (DEPRECATED) */ | |
409 | ||
410 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file); | |
411 | static struct file_operations acpi_processor_perf_fops = { | |
4be44fcd LB |
412 | .open = acpi_processor_perf_open_fs, |
413 | .read = seq_read, | |
414 | .llseek = seq_lseek, | |
415 | .release = single_release, | |
1da177e4 LT |
416 | }; |
417 | ||
418 | static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset) | |
419 | { | |
4be44fcd LB |
420 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
421 | int i; | |
1da177e4 LT |
422 | |
423 | ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show"); | |
424 | ||
425 | if (!pr) | |
426 | goto end; | |
427 | ||
428 | if (!pr->performance) { | |
429 | seq_puts(seq, "<not supported>\n"); | |
430 | goto end; | |
431 | } | |
432 | ||
433 | seq_printf(seq, "state count: %d\n" | |
4be44fcd LB |
434 | "active state: P%d\n", |
435 | pr->performance->state_count, pr->performance->state); | |
1da177e4 LT |
436 | |
437 | seq_puts(seq, "states:\n"); | |
438 | for (i = 0; i < pr->performance->state_count; i++) | |
4be44fcd LB |
439 | seq_printf(seq, |
440 | " %cP%d: %d MHz, %d mW, %d uS\n", | |
441 | (i == pr->performance->state ? '*' : ' '), i, | |
442 | (u32) pr->performance->states[i].core_frequency, | |
443 | (u32) pr->performance->states[i].power, | |
444 | (u32) pr->performance->states[i].transition_latency); | |
445 | ||
446 | end: | |
1da177e4 LT |
447 | return_VALUE(0); |
448 | } | |
449 | ||
450 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file) | |
451 | { | |
452 | return single_open(file, acpi_processor_perf_seq_show, | |
4be44fcd | 453 | PDE(inode)->data); |
1da177e4 LT |
454 | } |
455 | ||
456 | static ssize_t | |
4be44fcd LB |
457 | acpi_processor_write_performance(struct file *file, |
458 | const char __user * buffer, | |
459 | size_t count, loff_t * data) | |
1da177e4 | 460 | { |
4be44fcd LB |
461 | int result = 0; |
462 | struct seq_file *m = (struct seq_file *)file->private_data; | |
463 | struct acpi_processor *pr = (struct acpi_processor *)m->private; | |
1da177e4 | 464 | struct acpi_processor_performance *perf; |
4be44fcd LB |
465 | char state_string[12] = { '\0' }; |
466 | unsigned int new_state = 0; | |
467 | struct cpufreq_policy policy; | |
1da177e4 LT |
468 | |
469 | ACPI_FUNCTION_TRACE("acpi_processor_write_performance"); | |
470 | ||
471 | if (!pr || (count > sizeof(state_string) - 1)) | |
472 | return_VALUE(-EINVAL); | |
473 | ||
474 | perf = pr->performance; | |
475 | if (!perf) | |
476 | return_VALUE(-EINVAL); | |
477 | ||
478 | if (copy_from_user(state_string, buffer, count)) | |
479 | return_VALUE(-EFAULT); | |
480 | ||
481 | state_string[count] = '\0'; | |
482 | new_state = simple_strtoul(state_string, NULL, 0); | |
483 | ||
484 | if (new_state >= perf->state_count) | |
485 | return_VALUE(-EINVAL); | |
486 | ||
487 | cpufreq_get_policy(&policy, pr->id); | |
488 | ||
489 | policy.cpu = pr->id; | |
490 | policy.min = perf->states[new_state].core_frequency * 1000; | |
491 | policy.max = perf->states[new_state].core_frequency * 1000; | |
492 | ||
493 | result = cpufreq_set_policy(&policy); | |
494 | if (result) | |
495 | return_VALUE(result); | |
496 | ||
497 | return_VALUE(count); | |
498 | } | |
499 | ||
4be44fcd | 500 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
1da177e4 | 501 | { |
4be44fcd LB |
502 | struct proc_dir_entry *entry = NULL; |
503 | struct acpi_device *device = NULL; | |
1da177e4 LT |
504 | |
505 | ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile"); | |
506 | ||
507 | if (acpi_bus_get_device(pr->handle, &device)) | |
508 | return_VOID; | |
509 | ||
510 | /* add file 'performance' [R/W] */ | |
511 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, | |
4be44fcd LB |
512 | S_IFREG | S_IRUGO | S_IWUSR, |
513 | acpi_device_dir(device)); | |
a6fc6720 | 514 | if (entry){ |
d479e908 | 515 | acpi_processor_perf_fops.write = acpi_processor_write_performance; |
1da177e4 | 516 | entry->proc_fops = &acpi_processor_perf_fops; |
1da177e4 LT |
517 | entry->data = acpi_driver_data(device); |
518 | entry->owner = THIS_MODULE; | |
519 | } | |
520 | return_VOID; | |
521 | } | |
522 | ||
4be44fcd | 523 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) |
1da177e4 | 524 | { |
4be44fcd | 525 | struct acpi_device *device = NULL; |
1da177e4 LT |
526 | |
527 | ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile"); | |
528 | ||
529 | if (acpi_bus_get_device(pr->handle, &device)) | |
530 | return_VOID; | |
531 | ||
532 | /* remove file 'performance' */ | |
533 | remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, | |
4be44fcd | 534 | acpi_device_dir(device)); |
1da177e4 LT |
535 | |
536 | return_VOID; | |
537 | } | |
538 | ||
539 | #else | |
4be44fcd LB |
540 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
541 | { | |
542 | return; | |
543 | } | |
544 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) | |
545 | { | |
546 | return; | |
547 | } | |
548 | #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */ | |
1da177e4 | 549 | |
3b2d9942 VP |
550 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
551 | { | |
552 | int result = 0; | |
553 | acpi_status status = AE_OK; | |
554 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
555 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
556 | struct acpi_buffer state = {0, NULL}; | |
557 | union acpi_object *psd = NULL; | |
558 | struct acpi_psd_package *pdomain; | |
559 | ||
3b2d9942 VP |
560 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
561 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 562 | return -ENODEV; |
3b2d9942 VP |
563 | } |
564 | ||
565 | psd = (union acpi_object *) buffer.pointer; | |
566 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { | |
567 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
568 | result = -EFAULT; | |
569 | goto end; | |
570 | } | |
571 | ||
572 | if (psd->package.count != 1) { | |
573 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
574 | result = -EFAULT; | |
575 | goto end; | |
576 | } | |
577 | ||
578 | pdomain = &(pr->performance->domain_info); | |
579 | ||
580 | state.length = sizeof(struct acpi_psd_package); | |
581 | state.pointer = pdomain; | |
582 | ||
583 | status = acpi_extract_package(&(psd->package.elements[0]), | |
584 | &format, &state); | |
585 | if (ACPI_FAILURE(status)) { | |
586 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
587 | result = -EFAULT; | |
588 | goto end; | |
589 | } | |
590 | ||
591 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
592 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n")); | |
593 | result = -EFAULT; | |
594 | goto end; | |
595 | } | |
596 | ||
597 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
598 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n")); | |
599 | result = -EFAULT; | |
600 | goto end; | |
601 | } | |
602 | ||
603 | end: | |
604 | acpi_os_free(buffer.pointer); | |
9011bff4 | 605 | return result; |
3b2d9942 VP |
606 | } |
607 | ||
608 | int acpi_processor_preregister_performance( | |
609 | struct acpi_processor_performance **performance) | |
610 | { | |
611 | int count, count_target; | |
612 | int retval = 0; | |
613 | unsigned int i, j; | |
614 | cpumask_t covered_cpus; | |
615 | struct acpi_processor *pr; | |
616 | struct acpi_psd_package *pdomain; | |
617 | struct acpi_processor *match_pr; | |
618 | struct acpi_psd_package *match_pdomain; | |
619 | ||
785fcccd | 620 | mutex_lock(&performance_mutex); |
3b2d9942 VP |
621 | |
622 | retval = 0; | |
623 | ||
624 | /* Call _PSD for all CPUs */ | |
193de0c7 | 625 | for_each_possible_cpu(i) { |
3b2d9942 VP |
626 | pr = processors[i]; |
627 | if (!pr) { | |
628 | /* Look only at processors in ACPI namespace */ | |
629 | continue; | |
630 | } | |
631 | ||
632 | if (pr->performance) { | |
633 | retval = -EBUSY; | |
634 | continue; | |
635 | } | |
636 | ||
637 | if (!performance || !performance[i]) { | |
638 | retval = -EINVAL; | |
639 | continue; | |
640 | } | |
641 | ||
642 | pr->performance = performance[i]; | |
643 | cpu_set(i, pr->performance->shared_cpu_map); | |
644 | if (acpi_processor_get_psd(pr)) { | |
645 | retval = -EINVAL; | |
646 | continue; | |
647 | } | |
648 | } | |
649 | if (retval) | |
650 | goto err_ret; | |
651 | ||
652 | /* | |
653 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
654 | * domain info. | |
655 | */ | |
193de0c7 | 656 | for_each_possible_cpu(i) { |
3b2d9942 VP |
657 | pr = processors[i]; |
658 | if (!pr) | |
659 | continue; | |
660 | ||
661 | /* Basic validity check for domain info */ | |
662 | pdomain = &(pr->performance->domain_info); | |
663 | if ((pdomain->revision != ACPI_PSD_REV0_REVISION) || | |
664 | (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) { | |
665 | retval = -EINVAL; | |
666 | goto err_ret; | |
667 | } | |
668 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
669 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
670 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
671 | retval = -EINVAL; | |
672 | goto err_ret; | |
673 | } | |
674 | } | |
675 | ||
676 | cpus_clear(covered_cpus); | |
193de0c7 | 677 | for_each_possible_cpu(i) { |
3b2d9942 VP |
678 | pr = processors[i]; |
679 | if (!pr) | |
680 | continue; | |
681 | ||
682 | if (cpu_isset(i, covered_cpus)) | |
683 | continue; | |
684 | ||
685 | pdomain = &(pr->performance->domain_info); | |
686 | cpu_set(i, pr->performance->shared_cpu_map); | |
687 | cpu_set(i, covered_cpus); | |
688 | if (pdomain->num_processors <= 1) | |
689 | continue; | |
690 | ||
691 | /* Validate the Domain info */ | |
692 | count_target = pdomain->num_processors; | |
693 | count = 1; | |
694 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL || | |
695 | pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) { | |
696 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; | |
697 | } else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) { | |
698 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; | |
699 | } | |
700 | ||
193de0c7 | 701 | for_each_possible_cpu(j) { |
3b2d9942 VP |
702 | if (i == j) |
703 | continue; | |
704 | ||
705 | match_pr = processors[j]; | |
706 | if (!match_pr) | |
707 | continue; | |
708 | ||
709 | match_pdomain = &(match_pr->performance->domain_info); | |
710 | if (match_pdomain->domain != pdomain->domain) | |
711 | continue; | |
712 | ||
713 | /* Here i and j are in the same domain */ | |
714 | ||
715 | if (match_pdomain->num_processors != count_target) { | |
716 | retval = -EINVAL; | |
717 | goto err_ret; | |
718 | } | |
719 | ||
720 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
721 | retval = -EINVAL; | |
722 | goto err_ret; | |
723 | } | |
724 | ||
725 | cpu_set(j, covered_cpus); | |
726 | cpu_set(j, pr->performance->shared_cpu_map); | |
727 | count++; | |
728 | } | |
729 | ||
193de0c7 | 730 | for_each_possible_cpu(j) { |
3b2d9942 VP |
731 | if (i == j) |
732 | continue; | |
733 | ||
734 | match_pr = processors[j]; | |
735 | if (!match_pr) | |
736 | continue; | |
737 | ||
738 | match_pdomain = &(match_pr->performance->domain_info); | |
739 | if (match_pdomain->domain != pdomain->domain) | |
740 | continue; | |
741 | ||
742 | match_pr->performance->shared_type = | |
743 | pr->performance->shared_type; | |
744 | match_pr->performance->shared_cpu_map = | |
745 | pr->performance->shared_cpu_map; | |
746 | } | |
747 | } | |
748 | ||
749 | err_ret: | |
750 | if (retval) { | |
751 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error while parsing _PSD domain information. Assuming no coordination\n")); | |
752 | } | |
753 | ||
193de0c7 | 754 | for_each_possible_cpu(i) { |
3b2d9942 VP |
755 | pr = processors[i]; |
756 | if (!pr || !pr->performance) | |
757 | continue; | |
758 | ||
759 | /* Assume no coordination on any error parsing domain info */ | |
760 | if (retval) { | |
761 | cpus_clear(pr->performance->shared_cpu_map); | |
762 | cpu_set(i, pr->performance->shared_cpu_map); | |
763 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; | |
764 | } | |
765 | pr->performance = NULL; /* Will be set for real in register */ | |
766 | } | |
767 | ||
785fcccd | 768 | mutex_unlock(&performance_mutex); |
9011bff4 | 769 | return retval; |
3b2d9942 VP |
770 | } |
771 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
772 | ||
773 | ||
1da177e4 | 774 | int |
4be44fcd LB |
775 | acpi_processor_register_performance(struct acpi_processor_performance |
776 | *performance, unsigned int cpu) | |
1da177e4 LT |
777 | { |
778 | struct acpi_processor *pr; | |
779 | ||
780 | ACPI_FUNCTION_TRACE("acpi_processor_register_performance"); | |
781 | ||
782 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
783 | return_VALUE(-EINVAL); | |
784 | ||
65c19bbd | 785 | mutex_lock(&performance_mutex); |
1da177e4 LT |
786 | |
787 | pr = processors[cpu]; | |
788 | if (!pr) { | |
65c19bbd | 789 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
790 | return_VALUE(-ENODEV); |
791 | } | |
792 | ||
793 | if (pr->performance) { | |
65c19bbd | 794 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
795 | return_VALUE(-EBUSY); |
796 | } | |
797 | ||
a913f507 AM |
798 | WARN_ON(!performance); |
799 | ||
1da177e4 LT |
800 | pr->performance = performance; |
801 | ||
802 | if (acpi_processor_get_performance_info(pr)) { | |
803 | pr->performance = NULL; | |
65c19bbd | 804 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
805 | return_VALUE(-EIO); |
806 | } | |
807 | ||
808 | acpi_cpufreq_add_file(pr); | |
809 | ||
65c19bbd | 810 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
811 | return_VALUE(0); |
812 | } | |
1da177e4 | 813 | |
4be44fcd | 814 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
815 | |
816 | void | |
4be44fcd LB |
817 | acpi_processor_unregister_performance(struct acpi_processor_performance |
818 | *performance, unsigned int cpu) | |
1da177e4 LT |
819 | { |
820 | struct acpi_processor *pr; | |
821 | ||
822 | ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance"); | |
823 | ||
65c19bbd | 824 | mutex_lock(&performance_mutex); |
1da177e4 LT |
825 | |
826 | pr = processors[cpu]; | |
827 | if (!pr) { | |
65c19bbd | 828 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
829 | return_VOID; |
830 | } | |
831 | ||
a913f507 AM |
832 | if (pr->performance) |
833 | kfree(pr->performance->states); | |
1da177e4 LT |
834 | pr->performance = NULL; |
835 | ||
836 | acpi_cpufreq_remove_file(pr); | |
837 | ||
65c19bbd | 838 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
839 | |
840 | return_VOID; | |
841 | } | |
4be44fcd | 842 | |
1da177e4 | 843 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |