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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> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 | 34 | |
16be87ea | 35 | #ifdef CONFIG_X86 |
910dfae2 | 36 | #include <asm/cpufeature.h> |
16be87ea | 37 | #endif |
1da177e4 LT |
38 | |
39 | #include <acpi/acpi_bus.h> | |
89595b8f | 40 | #include <acpi/acpi_drivers.h> |
1da177e4 LT |
41 | #include <acpi/processor.h> |
42 | ||
a192a958 LB |
43 | #define PREFIX "ACPI: " |
44 | ||
1da177e4 | 45 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 LT |
46 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
47 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
f52fd66d | 48 | ACPI_MODULE_NAME("processor_perflib"); |
1da177e4 | 49 | |
65c19bbd | 50 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 LT |
51 | |
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 | ||
a1531acd TR |
62 | /* 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 | */ | |
9f497bcc | 68 | static int ignore_ppc = -1; |
613e5f33 | 69 | module_param(ignore_ppc, int, 0644); |
623b78c3 TR |
70 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
71 | "limited by BIOS, this should help"); | |
72 | ||
1da177e4 LT |
73 | #define PPC_REGISTERED 1 |
74 | #define PPC_IN_USE 2 | |
75 | ||
a1531acd | 76 | static int acpi_processor_ppc_status; |
1da177e4 LT |
77 | |
78 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 79 | unsigned long event, void *data) |
1da177e4 LT |
80 | { |
81 | struct cpufreq_policy *policy = data; | |
82 | struct acpi_processor *pr; | |
83 | unsigned int ppc = 0; | |
84 | ||
a1531acd TR |
85 | if (event == CPUFREQ_START && ignore_ppc <= 0) { |
86 | ignore_ppc = 0; | |
87 | return 0; | |
88 | } | |
89 | ||
623b78c3 TR |
90 | if (ignore_ppc) |
91 | return 0; | |
92 | ||
1da177e4 | 93 | if (event != CPUFREQ_INCOMPATIBLE) |
9b67c5d4 TR |
94 | return 0; |
95 | ||
96 | mutex_lock(&performance_mutex); | |
1da177e4 | 97 | |
706546d0 | 98 | pr = per_cpu(processors, policy->cpu); |
1da177e4 LT |
99 | if (!pr || !pr->performance) |
100 | goto out; | |
101 | ||
4be44fcd | 102 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 103 | |
0916bd3e | 104 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
105 | goto out; |
106 | ||
107 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
108 | pr->performance->states[ppc]. |
109 | core_frequency * 1000); | |
1da177e4 | 110 | |
4be44fcd | 111 | out: |
65c19bbd | 112 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
113 | |
114 | return 0; | |
115 | } | |
116 | ||
1da177e4 LT |
117 | static struct notifier_block acpi_ppc_notifier_block = { |
118 | .notifier_call = acpi_processor_ppc_notifier, | |
119 | }; | |
120 | ||
4be44fcd | 121 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 122 | { |
4be44fcd | 123 | acpi_status status = 0; |
27663c58 | 124 | unsigned long long ppc = 0; |
1da177e4 | 125 | |
1da177e4 LT |
126 | |
127 | if (!pr) | |
d550d98d | 128 | return -EINVAL; |
1da177e4 LT |
129 | |
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 | ||
4be44fcd | 139 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 140 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 141 | return -ENODEV; |
1da177e4 LT |
142 | } |
143 | ||
2d06d8c4 | 144 | pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
919158d1 TR |
145 | (int)ppc, ppc ? "" : "not"); |
146 | ||
4be44fcd | 147 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 148 | |
d550d98d | 149 | return 0; |
1da177e4 LT |
150 | } |
151 | ||
d81c45e1 ZY |
152 | #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 | */ | |
160 | static 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 | ||
180 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) | |
1da177e4 | 181 | { |
623b78c3 TR |
182 | int ret; |
183 | ||
d81c45e1 ZY |
184 | 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); | |
623b78c3 | 191 | return 0; |
d81c45e1 | 192 | } |
623b78c3 TR |
193 | |
194 | ret = acpi_processor_get_platform_limit(pr); | |
d81c45e1 ZY |
195 | /* |
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 | } | |
1da177e4 LT |
205 | if (ret < 0) |
206 | return (ret); | |
207 | else | |
208 | return cpufreq_update_policy(pr->id); | |
209 | } | |
210 | ||
e2f74f35 TR |
211 | int 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 | } | |
222 | EXPORT_SYMBOL(acpi_processor_get_bios_limit); | |
223 | ||
4be44fcd LB |
224 | void acpi_processor_ppc_init(void) |
225 | { | |
226 | if (!cpufreq_register_notifier | |
227 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
228 | acpi_processor_ppc_status |= PPC_REGISTERED; |
229 | else | |
4be44fcd LB |
230 | printk(KERN_DEBUG |
231 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
232 | } |
233 | ||
4be44fcd LB |
234 | void acpi_processor_ppc_exit(void) |
235 | { | |
1da177e4 | 236 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
237 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
238 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
239 | |
240 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
241 | } | |
242 | ||
9061e0e1 AK |
243 | /* |
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 | */ | |
248 | void 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 | ||
4be44fcd | 265 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 266 | { |
4be44fcd LB |
267 | 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 }; | |
1da177e4 | 272 | |
1da177e4 LT |
273 | |
274 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 275 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 276 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 277 | return -ENODEV; |
1da177e4 LT |
278 | } |
279 | ||
4be44fcd | 280 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 281 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 282 | || (pct->package.count != 2)) { |
6468463a | 283 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
284 | 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) | |
4be44fcd LB |
295 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
296 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 297 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
298 | result = -EFAULT; |
299 | goto end; | |
300 | } | |
4be44fcd LB |
301 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
302 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
303 | |
304 | /* | |
305 | * status_register | |
306 | */ | |
307 | ||
308 | obj = pct->package.elements[1]; | |
309 | ||
310 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
311 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
312 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 313 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
314 | result = -EFAULT; |
315 | goto end; | |
316 | } | |
317 | ||
4be44fcd LB |
318 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
319 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 320 | |
4be44fcd | 321 | end: |
02438d87 | 322 | kfree(buffer.pointer); |
1da177e4 | 323 | |
d550d98d | 324 | return result; |
1da177e4 LT |
325 | } |
326 | ||
4be44fcd | 327 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 328 | { |
4be44fcd LB |
329 | int result = 0; |
330 | acpi_status status = AE_OK; | |
331 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
332 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
333 | struct acpi_buffer state = { 0, NULL }; | |
334 | union acpi_object *pss = NULL; | |
335 | int i; | |
d8e725f3 | 336 | int last_invalid = -1; |
1da177e4 | 337 | |
1da177e4 LT |
338 | |
339 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 340 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 341 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 342 | return -ENODEV; |
1da177e4 LT |
343 | } |
344 | ||
50dd0969 | 345 | pss = buffer.pointer; |
1da177e4 | 346 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 347 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
348 | result = -EFAULT; |
349 | goto end; | |
350 | } | |
351 | ||
352 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 353 | pss->package.count)); |
1da177e4 LT |
354 | |
355 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
356 | pr->performance->states = |
357 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
358 | GFP_KERNEL); | |
1da177e4 LT |
359 | if (!pr->performance->states) { |
360 | result = -ENOMEM; | |
361 | goto end; | |
362 | } | |
363 | ||
364 | for (i = 0; i < pr->performance->state_count; i++) { | |
365 | ||
366 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
367 | ||
368 | state.length = sizeof(struct acpi_processor_px); | |
369 | state.pointer = px; | |
370 | ||
371 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
372 | ||
373 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 374 | &format, &state); |
1da177e4 | 375 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 376 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
377 | result = -EFAULT; |
378 | kfree(pr->performance->states); | |
379 | goto end; | |
380 | } | |
381 | ||
382 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
383 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
384 | i, | |
385 | (u32) px->core_frequency, | |
386 | (u32) px->power, | |
387 | (u32) px->transition_latency, | |
388 | (u32) px->bus_master_latency, | |
389 | (u32) px->control, (u32) px->status)); | |
1da177e4 | 390 | |
34d531e6 LB |
391 | /* |
392 | * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq | |
393 | */ | |
394 | if (!px->core_frequency || | |
395 | ((u32)(px->core_frequency * 1000) != | |
396 | (px->core_frequency * 1000))) { | |
397 | printk(KERN_ERR FW_BUG PREFIX | |
d8e725f3 MAC |
398 | "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", |
399 | pr->id, px->core_frequency); | |
400 | if (last_invalid == -1) | |
401 | last_invalid = i; | |
402 | } else { | |
403 | if (last_invalid != -1) { | |
404 | /* | |
405 | * Copy this valid entry over last_invalid entry | |
406 | */ | |
407 | memcpy(&(pr->performance->states[last_invalid]), | |
408 | px, sizeof(struct acpi_processor_px)); | |
409 | ++last_invalid; | |
410 | } | |
1da177e4 LT |
411 | } |
412 | } | |
413 | ||
d8e725f3 MAC |
414 | if (last_invalid == 0) { |
415 | printk(KERN_ERR FW_BUG PREFIX | |
416 | "No valid BIOS _PSS frequency found for processor %d\n", pr->id); | |
417 | result = -EFAULT; | |
418 | kfree(pr->performance->states); | |
419 | pr->performance->states = NULL; | |
420 | } | |
421 | ||
422 | if (last_invalid > 0) | |
423 | pr->performance->state_count = last_invalid; | |
424 | ||
4be44fcd | 425 | end: |
02438d87 | 426 | kfree(buffer.pointer); |
1da177e4 | 427 | |
d550d98d | 428 | return result; |
1da177e4 LT |
429 | } |
430 | ||
4be44fcd | 431 | static int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 432 | { |
4be44fcd LB |
433 | int result = 0; |
434 | acpi_status status = AE_OK; | |
435 | acpi_handle handle = NULL; | |
1da177e4 | 436 | |
1da177e4 | 437 | if (!pr || !pr->performance || !pr->handle) |
d550d98d | 438 | return -EINVAL; |
1da177e4 | 439 | |
1da177e4 LT |
440 | status = acpi_get_handle(pr->handle, "_PCT", &handle); |
441 | if (ACPI_FAILURE(status)) { | |
442 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 443 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 444 | return -ENODEV; |
1da177e4 LT |
445 | } |
446 | ||
447 | result = acpi_processor_get_performance_control(pr); | |
448 | if (result) | |
910dfae2 | 449 | goto update_bios; |
1da177e4 LT |
450 | |
451 | result = acpi_processor_get_performance_states(pr); | |
452 | if (result) | |
910dfae2 | 453 | goto update_bios; |
1da177e4 | 454 | |
455c0d71 DW |
455 | /* We need to call _PPC once when cpufreq starts */ |
456 | if (ignore_ppc != 1) | |
457 | result = acpi_processor_get_platform_limit(pr); | |
458 | ||
459 | return result; | |
910dfae2 TR |
460 | |
461 | /* | |
462 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that | |
463 | * the BIOS is older than the CPU and does not know its frequencies | |
464 | */ | |
465 | update_bios: | |
16be87ea | 466 | #ifdef CONFIG_X86 |
910dfae2 TR |
467 | if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){ |
468 | if(boot_cpu_has(X86_FEATURE_EST)) | |
469 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " | |
470 | "frequency support\n"); | |
471 | } | |
16be87ea | 472 | #endif |
910dfae2 | 473 | return result; |
1da177e4 LT |
474 | } |
475 | ||
4be44fcd LB |
476 | int acpi_processor_notify_smm(struct module *calling_module) |
477 | { | |
478 | acpi_status status; | |
479 | static int is_done = 0; | |
1da177e4 | 480 | |
1da177e4 LT |
481 | |
482 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 483 | return -EBUSY; |
1da177e4 LT |
484 | |
485 | if (!try_module_get(calling_module)) | |
d550d98d | 486 | return -EINVAL; |
1da177e4 | 487 | |
58f87ed0 LDM |
488 | /* is_done is set to negative if an error occurred, |
489 | * and to postitive if _no_ error occurred, but SMM | |
1da177e4 LT |
490 | * was already notified. This avoids double notification |
491 | * which might lead to unexpected results... | |
492 | */ | |
493 | if (is_done > 0) { | |
494 | module_put(calling_module); | |
d550d98d | 495 | return 0; |
4be44fcd | 496 | } else if (is_done < 0) { |
1da177e4 | 497 | module_put(calling_module); |
d550d98d | 498 | return is_done; |
1da177e4 LT |
499 | } |
500 | ||
501 | is_done = -EIO; | |
502 | ||
ad71860a | 503 | /* Can't write pstate_control to smi_command if either value is zero */ |
cee324b1 | 504 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
ad71860a | 505 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 506 | module_put(calling_module); |
d550d98d | 507 | return 0; |
1da177e4 LT |
508 | } |
509 | ||
4be44fcd | 510 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a | 511 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
cee324b1 | 512 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
1da177e4 | 513 | |
cee324b1 AS |
514 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
515 | (u32) acpi_gbl_FADT.pstate_control, 8); | |
4be44fcd | 516 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 517 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a | 518 | "Failed to write pstate_control [0x%x] to " |
cee324b1 AS |
519 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
520 | acpi_gbl_FADT.smi_command)); | |
1da177e4 | 521 | module_put(calling_module); |
d550d98d | 522 | return status; |
1da177e4 LT |
523 | } |
524 | ||
525 | /* Success. If there's no _PPC, we need to fear nothing, so | |
526 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
527 | is_done = 1; | |
528 | ||
529 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
530 | module_put(calling_module); | |
531 | ||
d550d98d | 532 | return 0; |
1da177e4 | 533 | } |
1da177e4 | 534 | |
4be44fcd | 535 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 | 536 | |
3b2d9942 VP |
537 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
538 | { | |
539 | int result = 0; | |
540 | acpi_status status = AE_OK; | |
541 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
542 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
543 | struct acpi_buffer state = {0, NULL}; | |
544 | union acpi_object *psd = NULL; | |
545 | struct acpi_psd_package *pdomain; | |
546 | ||
3b2d9942 VP |
547 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
548 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 549 | return -ENODEV; |
3b2d9942 VP |
550 | } |
551 | ||
50dd0969 | 552 | psd = buffer.pointer; |
3b2d9942 | 553 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
55ac9a01 | 554 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
555 | result = -EFAULT; |
556 | goto end; | |
557 | } | |
558 | ||
559 | if (psd->package.count != 1) { | |
55ac9a01 | 560 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
561 | result = -EFAULT; |
562 | goto end; | |
563 | } | |
564 | ||
565 | pdomain = &(pr->performance->domain_info); | |
566 | ||
567 | state.length = sizeof(struct acpi_psd_package); | |
568 | state.pointer = pdomain; | |
569 | ||
570 | status = acpi_extract_package(&(psd->package.elements[0]), | |
571 | &format, &state); | |
572 | if (ACPI_FAILURE(status)) { | |
55ac9a01 | 573 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
574 | result = -EFAULT; |
575 | goto end; | |
576 | } | |
577 | ||
578 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
55ac9a01 | 579 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
3b2d9942 VP |
580 | result = -EFAULT; |
581 | goto end; | |
582 | } | |
583 | ||
584 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
55ac9a01 | 585 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
3b2d9942 VP |
586 | result = -EFAULT; |
587 | goto end; | |
588 | } | |
589 | ||
e1eb4779 SG |
590 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
591 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
592 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
593 | printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); | |
594 | result = -EFAULT; | |
595 | goto end; | |
596 | } | |
3b2d9942 | 597 | end: |
02438d87 | 598 | kfree(buffer.pointer); |
9011bff4 | 599 | return result; |
3b2d9942 VP |
600 | } |
601 | ||
602 | int acpi_processor_preregister_performance( | |
a29d8b8e | 603 | struct acpi_processor_performance __percpu *performance) |
3b2d9942 VP |
604 | { |
605 | int count, count_target; | |
606 | int retval = 0; | |
607 | unsigned int i, j; | |
2fdf66b4 | 608 | cpumask_var_t covered_cpus; |
3b2d9942 VP |
609 | struct acpi_processor *pr; |
610 | struct acpi_psd_package *pdomain; | |
611 | struct acpi_processor *match_pr; | |
612 | struct acpi_psd_package *match_pdomain; | |
613 | ||
79f55997 | 614 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
615 | return -ENOMEM; |
616 | ||
785fcccd | 617 | mutex_lock(&performance_mutex); |
3b2d9942 | 618 | |
e1eb4779 SG |
619 | /* |
620 | * Check if another driver has already registered, and abort before | |
621 | * changing pr->performance if it has. Check input data as well. | |
622 | */ | |
193de0c7 | 623 | for_each_possible_cpu(i) { |
706546d0 | 624 | pr = per_cpu(processors, i); |
3b2d9942 VP |
625 | if (!pr) { |
626 | /* Look only at processors in ACPI namespace */ | |
627 | continue; | |
628 | } | |
629 | ||
630 | if (pr->performance) { | |
631 | retval = -EBUSY; | |
e1eb4779 | 632 | goto err_out; |
3b2d9942 VP |
633 | } |
634 | ||
b36128c8 | 635 | if (!performance || !per_cpu_ptr(performance, i)) { |
3b2d9942 | 636 | retval = -EINVAL; |
e1eb4779 | 637 | goto err_out; |
3b2d9942 | 638 | } |
e1eb4779 SG |
639 | } |
640 | ||
641 | /* Call _PSD for all CPUs */ | |
642 | for_each_possible_cpu(i) { | |
643 | pr = per_cpu(processors, i); | |
644 | if (!pr) | |
645 | continue; | |
3b2d9942 | 646 | |
b36128c8 | 647 | pr->performance = per_cpu_ptr(performance, i); |
2fdf66b4 | 648 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
3b2d9942 VP |
649 | if (acpi_processor_get_psd(pr)) { |
650 | retval = -EINVAL; | |
651 | continue; | |
652 | } | |
653 | } | |
654 | if (retval) | |
655 | goto err_ret; | |
656 | ||
657 | /* | |
658 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
659 | * domain info. | |
660 | */ | |
193de0c7 | 661 | for_each_possible_cpu(i) { |
706546d0 | 662 | pr = per_cpu(processors, i); |
3b2d9942 VP |
663 | if (!pr) |
664 | continue; | |
665 | ||
2fdf66b4 | 666 | if (cpumask_test_cpu(i, covered_cpus)) |
3b2d9942 VP |
667 | continue; |
668 | ||
669 | pdomain = &(pr->performance->domain_info); | |
2fdf66b4 RR |
670 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
671 | cpumask_set_cpu(i, covered_cpus); | |
3b2d9942 VP |
672 | if (pdomain->num_processors <= 1) |
673 | continue; | |
674 | ||
675 | /* Validate the Domain info */ | |
676 | count_target = pdomain->num_processors; | |
677 | count = 1; | |
46f18e3a | 678 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 679 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
680 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
681 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
682 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 683 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 684 | |
193de0c7 | 685 | for_each_possible_cpu(j) { |
3b2d9942 VP |
686 | if (i == j) |
687 | continue; | |
688 | ||
706546d0 | 689 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
690 | if (!match_pr) |
691 | continue; | |
692 | ||
693 | match_pdomain = &(match_pr->performance->domain_info); | |
694 | if (match_pdomain->domain != pdomain->domain) | |
695 | continue; | |
696 | ||
697 | /* Here i and j are in the same domain */ | |
698 | ||
699 | if (match_pdomain->num_processors != count_target) { | |
700 | retval = -EINVAL; | |
701 | goto err_ret; | |
702 | } | |
703 | ||
704 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
705 | retval = -EINVAL; | |
706 | goto err_ret; | |
707 | } | |
708 | ||
2fdf66b4 RR |
709 | cpumask_set_cpu(j, covered_cpus); |
710 | cpumask_set_cpu(j, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
711 | count++; |
712 | } | |
713 | ||
193de0c7 | 714 | for_each_possible_cpu(j) { |
3b2d9942 VP |
715 | if (i == j) |
716 | continue; | |
717 | ||
706546d0 | 718 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
719 | if (!match_pr) |
720 | continue; | |
721 | ||
722 | match_pdomain = &(match_pr->performance->domain_info); | |
723 | if (match_pdomain->domain != pdomain->domain) | |
724 | continue; | |
725 | ||
726 | match_pr->performance->shared_type = | |
727 | pr->performance->shared_type; | |
2fdf66b4 RR |
728 | cpumask_copy(match_pr->performance->shared_cpu_map, |
729 | pr->performance->shared_cpu_map); | |
3b2d9942 VP |
730 | } |
731 | } | |
732 | ||
733 | err_ret: | |
193de0c7 | 734 | for_each_possible_cpu(i) { |
706546d0 | 735 | pr = per_cpu(processors, i); |
3b2d9942 VP |
736 | if (!pr || !pr->performance) |
737 | continue; | |
738 | ||
739 | /* Assume no coordination on any error parsing domain info */ | |
740 | if (retval) { | |
2fdf66b4 RR |
741 | cpumask_clear(pr->performance->shared_cpu_map); |
742 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
743 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
744 | } | |
745 | pr->performance = NULL; /* Will be set for real in register */ | |
746 | } | |
747 | ||
e1eb4779 | 748 | err_out: |
785fcccd | 749 | mutex_unlock(&performance_mutex); |
2fdf66b4 | 750 | free_cpumask_var(covered_cpus); |
9011bff4 | 751 | return retval; |
3b2d9942 VP |
752 | } |
753 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
754 | ||
1da177e4 | 755 | int |
4be44fcd LB |
756 | acpi_processor_register_performance(struct acpi_processor_performance |
757 | *performance, unsigned int cpu) | |
1da177e4 LT |
758 | { |
759 | struct acpi_processor *pr; | |
760 | ||
1da177e4 | 761 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
d550d98d | 762 | return -EINVAL; |
1da177e4 | 763 | |
65c19bbd | 764 | mutex_lock(&performance_mutex); |
1da177e4 | 765 | |
706546d0 | 766 | pr = per_cpu(processors, cpu); |
1da177e4 | 767 | if (!pr) { |
65c19bbd | 768 | mutex_unlock(&performance_mutex); |
d550d98d | 769 | return -ENODEV; |
1da177e4 LT |
770 | } |
771 | ||
772 | if (pr->performance) { | |
65c19bbd | 773 | mutex_unlock(&performance_mutex); |
d550d98d | 774 | return -EBUSY; |
1da177e4 LT |
775 | } |
776 | ||
a913f507 AM |
777 | WARN_ON(!performance); |
778 | ||
1da177e4 LT |
779 | pr->performance = performance; |
780 | ||
781 | if (acpi_processor_get_performance_info(pr)) { | |
782 | pr->performance = NULL; | |
65c19bbd | 783 | mutex_unlock(&performance_mutex); |
d550d98d | 784 | return -EIO; |
1da177e4 LT |
785 | } |
786 | ||
65c19bbd | 787 | mutex_unlock(&performance_mutex); |
d550d98d | 788 | return 0; |
1da177e4 | 789 | } |
1da177e4 | 790 | |
4be44fcd | 791 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
792 | |
793 | void | |
4be44fcd LB |
794 | acpi_processor_unregister_performance(struct acpi_processor_performance |
795 | *performance, unsigned int cpu) | |
1da177e4 LT |
796 | { |
797 | struct acpi_processor *pr; | |
798 | ||
65c19bbd | 799 | mutex_lock(&performance_mutex); |
1da177e4 | 800 | |
706546d0 | 801 | pr = per_cpu(processors, cpu); |
1da177e4 | 802 | if (!pr) { |
65c19bbd | 803 | mutex_unlock(&performance_mutex); |
d550d98d | 804 | return; |
1da177e4 LT |
805 | } |
806 | ||
a913f507 AM |
807 | if (pr->performance) |
808 | kfree(pr->performance->states); | |
1da177e4 LT |
809 | pr->performance = NULL; |
810 | ||
65c19bbd | 811 | mutex_unlock(&performance_mutex); |
1da177e4 | 812 | |
d550d98d | 813 | return; |
1da177e4 | 814 | } |
4be44fcd | 815 | |
1da177e4 | 816 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |