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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 | ||
4be44fcd | 243 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 244 | { |
4be44fcd LB |
245 | int result = 0; |
246 | acpi_status status = 0; | |
247 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
248 | union acpi_object *pct = NULL; | |
249 | union acpi_object obj = { 0 }; | |
1da177e4 | 250 | |
1da177e4 LT |
251 | |
252 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 253 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 254 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 255 | return -ENODEV; |
1da177e4 LT |
256 | } |
257 | ||
4be44fcd | 258 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 259 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 260 | || (pct->package.count != 2)) { |
6468463a | 261 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
262 | result = -EFAULT; |
263 | goto end; | |
264 | } | |
265 | ||
266 | /* | |
267 | * control_register | |
268 | */ | |
269 | ||
270 | obj = pct->package.elements[0]; | |
271 | ||
272 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
273 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
274 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 275 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
276 | result = -EFAULT; |
277 | goto end; | |
278 | } | |
4be44fcd LB |
279 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
280 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
281 | |
282 | /* | |
283 | * status_register | |
284 | */ | |
285 | ||
286 | obj = pct->package.elements[1]; | |
287 | ||
288 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
289 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
290 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 291 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
292 | result = -EFAULT; |
293 | goto end; | |
294 | } | |
295 | ||
4be44fcd LB |
296 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
297 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 298 | |
4be44fcd | 299 | end: |
02438d87 | 300 | kfree(buffer.pointer); |
1da177e4 | 301 | |
d550d98d | 302 | return result; |
1da177e4 LT |
303 | } |
304 | ||
4be44fcd | 305 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 306 | { |
4be44fcd LB |
307 | int result = 0; |
308 | acpi_status status = AE_OK; | |
309 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
310 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
311 | struct acpi_buffer state = { 0, NULL }; | |
312 | union acpi_object *pss = NULL; | |
313 | int i; | |
1da177e4 | 314 | |
1da177e4 LT |
315 | |
316 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 317 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 318 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 319 | return -ENODEV; |
1da177e4 LT |
320 | } |
321 | ||
50dd0969 | 322 | pss = buffer.pointer; |
1da177e4 | 323 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 324 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
325 | result = -EFAULT; |
326 | goto end; | |
327 | } | |
328 | ||
329 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 330 | pss->package.count)); |
1da177e4 LT |
331 | |
332 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
333 | pr->performance->states = |
334 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
335 | GFP_KERNEL); | |
1da177e4 LT |
336 | if (!pr->performance->states) { |
337 | result = -ENOMEM; | |
338 | goto end; | |
339 | } | |
340 | ||
341 | for (i = 0; i < pr->performance->state_count; i++) { | |
342 | ||
343 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
344 | ||
345 | state.length = sizeof(struct acpi_processor_px); | |
346 | state.pointer = px; | |
347 | ||
348 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
349 | ||
350 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 351 | &format, &state); |
1da177e4 | 352 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 353 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
354 | result = -EFAULT; |
355 | kfree(pr->performance->states); | |
356 | goto end; | |
357 | } | |
358 | ||
359 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
360 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
361 | i, | |
362 | (u32) px->core_frequency, | |
363 | (u32) px->power, | |
364 | (u32) px->transition_latency, | |
365 | (u32) px->bus_master_latency, | |
366 | (u32) px->control, (u32) px->status)); | |
1da177e4 | 367 | |
34d531e6 LB |
368 | /* |
369 | * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq | |
370 | */ | |
371 | if (!px->core_frequency || | |
372 | ((u32)(px->core_frequency * 1000) != | |
373 | (px->core_frequency * 1000))) { | |
374 | printk(KERN_ERR FW_BUG PREFIX | |
375 | "Invalid BIOS _PSS frequency: 0x%llx MHz\n", | |
376 | px->core_frequency); | |
1da177e4 LT |
377 | result = -EFAULT; |
378 | kfree(pr->performance->states); | |
379 | goto end; | |
380 | } | |
381 | } | |
382 | ||
4be44fcd | 383 | end: |
02438d87 | 384 | kfree(buffer.pointer); |
1da177e4 | 385 | |
d550d98d | 386 | return result; |
1da177e4 LT |
387 | } |
388 | ||
4be44fcd | 389 | static int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 390 | { |
4be44fcd LB |
391 | int result = 0; |
392 | acpi_status status = AE_OK; | |
393 | acpi_handle handle = NULL; | |
1da177e4 | 394 | |
1da177e4 | 395 | if (!pr || !pr->performance || !pr->handle) |
d550d98d | 396 | return -EINVAL; |
1da177e4 | 397 | |
1da177e4 LT |
398 | status = acpi_get_handle(pr->handle, "_PCT", &handle); |
399 | if (ACPI_FAILURE(status)) { | |
400 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 401 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 402 | return -ENODEV; |
1da177e4 LT |
403 | } |
404 | ||
405 | result = acpi_processor_get_performance_control(pr); | |
406 | if (result) | |
910dfae2 | 407 | goto update_bios; |
1da177e4 LT |
408 | |
409 | result = acpi_processor_get_performance_states(pr); | |
410 | if (result) | |
910dfae2 | 411 | goto update_bios; |
1da177e4 | 412 | |
455c0d71 DW |
413 | /* We need to call _PPC once when cpufreq starts */ |
414 | if (ignore_ppc != 1) | |
415 | result = acpi_processor_get_platform_limit(pr); | |
416 | ||
417 | return result; | |
910dfae2 TR |
418 | |
419 | /* | |
420 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that | |
421 | * the BIOS is older than the CPU and does not know its frequencies | |
422 | */ | |
423 | update_bios: | |
16be87ea | 424 | #ifdef CONFIG_X86 |
910dfae2 TR |
425 | if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){ |
426 | if(boot_cpu_has(X86_FEATURE_EST)) | |
427 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " | |
428 | "frequency support\n"); | |
429 | } | |
16be87ea | 430 | #endif |
910dfae2 | 431 | return result; |
1da177e4 LT |
432 | } |
433 | ||
4be44fcd LB |
434 | int acpi_processor_notify_smm(struct module *calling_module) |
435 | { | |
436 | acpi_status status; | |
437 | static int is_done = 0; | |
1da177e4 | 438 | |
1da177e4 LT |
439 | |
440 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 441 | return -EBUSY; |
1da177e4 LT |
442 | |
443 | if (!try_module_get(calling_module)) | |
d550d98d | 444 | return -EINVAL; |
1da177e4 | 445 | |
58f87ed0 LDM |
446 | /* is_done is set to negative if an error occurred, |
447 | * and to postitive if _no_ error occurred, but SMM | |
1da177e4 LT |
448 | * was already notified. This avoids double notification |
449 | * which might lead to unexpected results... | |
450 | */ | |
451 | if (is_done > 0) { | |
452 | module_put(calling_module); | |
d550d98d | 453 | return 0; |
4be44fcd | 454 | } else if (is_done < 0) { |
1da177e4 | 455 | module_put(calling_module); |
d550d98d | 456 | return is_done; |
1da177e4 LT |
457 | } |
458 | ||
459 | is_done = -EIO; | |
460 | ||
ad71860a | 461 | /* Can't write pstate_control to smi_command if either value is zero */ |
cee324b1 | 462 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
ad71860a | 463 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 464 | module_put(calling_module); |
d550d98d | 465 | return 0; |
1da177e4 LT |
466 | } |
467 | ||
4be44fcd | 468 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a | 469 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
cee324b1 | 470 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
1da177e4 | 471 | |
cee324b1 AS |
472 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
473 | (u32) acpi_gbl_FADT.pstate_control, 8); | |
4be44fcd | 474 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 475 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a | 476 | "Failed to write pstate_control [0x%x] to " |
cee324b1 AS |
477 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
478 | acpi_gbl_FADT.smi_command)); | |
1da177e4 | 479 | module_put(calling_module); |
d550d98d | 480 | return status; |
1da177e4 LT |
481 | } |
482 | ||
483 | /* Success. If there's no _PPC, we need to fear nothing, so | |
484 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
485 | is_done = 1; | |
486 | ||
487 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
488 | module_put(calling_module); | |
489 | ||
d550d98d | 490 | return 0; |
1da177e4 | 491 | } |
1da177e4 | 492 | |
4be44fcd | 493 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 | 494 | |
3b2d9942 VP |
495 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
496 | { | |
497 | int result = 0; | |
498 | acpi_status status = AE_OK; | |
499 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
500 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
501 | struct acpi_buffer state = {0, NULL}; | |
502 | union acpi_object *psd = NULL; | |
503 | struct acpi_psd_package *pdomain; | |
504 | ||
3b2d9942 VP |
505 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
506 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 507 | return -ENODEV; |
3b2d9942 VP |
508 | } |
509 | ||
50dd0969 | 510 | psd = buffer.pointer; |
3b2d9942 | 511 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
55ac9a01 | 512 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
513 | result = -EFAULT; |
514 | goto end; | |
515 | } | |
516 | ||
517 | if (psd->package.count != 1) { | |
55ac9a01 | 518 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
519 | result = -EFAULT; |
520 | goto end; | |
521 | } | |
522 | ||
523 | pdomain = &(pr->performance->domain_info); | |
524 | ||
525 | state.length = sizeof(struct acpi_psd_package); | |
526 | state.pointer = pdomain; | |
527 | ||
528 | status = acpi_extract_package(&(psd->package.elements[0]), | |
529 | &format, &state); | |
530 | if (ACPI_FAILURE(status)) { | |
55ac9a01 | 531 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
532 | result = -EFAULT; |
533 | goto end; | |
534 | } | |
535 | ||
536 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
55ac9a01 | 537 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
3b2d9942 VP |
538 | result = -EFAULT; |
539 | goto end; | |
540 | } | |
541 | ||
542 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
55ac9a01 | 543 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
3b2d9942 VP |
544 | result = -EFAULT; |
545 | goto end; | |
546 | } | |
547 | ||
e1eb4779 SG |
548 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
549 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
550 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
551 | printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); | |
552 | result = -EFAULT; | |
553 | goto end; | |
554 | } | |
3b2d9942 | 555 | end: |
02438d87 | 556 | kfree(buffer.pointer); |
9011bff4 | 557 | return result; |
3b2d9942 VP |
558 | } |
559 | ||
560 | int acpi_processor_preregister_performance( | |
a29d8b8e | 561 | struct acpi_processor_performance __percpu *performance) |
3b2d9942 VP |
562 | { |
563 | int count, count_target; | |
564 | int retval = 0; | |
565 | unsigned int i, j; | |
2fdf66b4 | 566 | cpumask_var_t covered_cpus; |
3b2d9942 VP |
567 | struct acpi_processor *pr; |
568 | struct acpi_psd_package *pdomain; | |
569 | struct acpi_processor *match_pr; | |
570 | struct acpi_psd_package *match_pdomain; | |
571 | ||
79f55997 | 572 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
573 | return -ENOMEM; |
574 | ||
785fcccd | 575 | mutex_lock(&performance_mutex); |
3b2d9942 | 576 | |
e1eb4779 SG |
577 | /* |
578 | * Check if another driver has already registered, and abort before | |
579 | * changing pr->performance if it has. Check input data as well. | |
580 | */ | |
193de0c7 | 581 | for_each_possible_cpu(i) { |
706546d0 | 582 | pr = per_cpu(processors, i); |
3b2d9942 VP |
583 | if (!pr) { |
584 | /* Look only at processors in ACPI namespace */ | |
585 | continue; | |
586 | } | |
587 | ||
588 | if (pr->performance) { | |
589 | retval = -EBUSY; | |
e1eb4779 | 590 | goto err_out; |
3b2d9942 VP |
591 | } |
592 | ||
b36128c8 | 593 | if (!performance || !per_cpu_ptr(performance, i)) { |
3b2d9942 | 594 | retval = -EINVAL; |
e1eb4779 | 595 | goto err_out; |
3b2d9942 | 596 | } |
e1eb4779 SG |
597 | } |
598 | ||
599 | /* Call _PSD for all CPUs */ | |
600 | for_each_possible_cpu(i) { | |
601 | pr = per_cpu(processors, i); | |
602 | if (!pr) | |
603 | continue; | |
3b2d9942 | 604 | |
b36128c8 | 605 | pr->performance = per_cpu_ptr(performance, i); |
2fdf66b4 | 606 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
3b2d9942 VP |
607 | if (acpi_processor_get_psd(pr)) { |
608 | retval = -EINVAL; | |
609 | continue; | |
610 | } | |
611 | } | |
612 | if (retval) | |
613 | goto err_ret; | |
614 | ||
615 | /* | |
616 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
617 | * domain info. | |
618 | */ | |
193de0c7 | 619 | for_each_possible_cpu(i) { |
706546d0 | 620 | pr = per_cpu(processors, i); |
3b2d9942 VP |
621 | if (!pr) |
622 | continue; | |
623 | ||
2fdf66b4 | 624 | if (cpumask_test_cpu(i, covered_cpus)) |
3b2d9942 VP |
625 | continue; |
626 | ||
627 | pdomain = &(pr->performance->domain_info); | |
2fdf66b4 RR |
628 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
629 | cpumask_set_cpu(i, covered_cpus); | |
3b2d9942 VP |
630 | if (pdomain->num_processors <= 1) |
631 | continue; | |
632 | ||
633 | /* Validate the Domain info */ | |
634 | count_target = pdomain->num_processors; | |
635 | count = 1; | |
46f18e3a | 636 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 637 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
638 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
639 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
640 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 641 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 642 | |
193de0c7 | 643 | for_each_possible_cpu(j) { |
3b2d9942 VP |
644 | if (i == j) |
645 | continue; | |
646 | ||
706546d0 | 647 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
648 | if (!match_pr) |
649 | continue; | |
650 | ||
651 | match_pdomain = &(match_pr->performance->domain_info); | |
652 | if (match_pdomain->domain != pdomain->domain) | |
653 | continue; | |
654 | ||
655 | /* Here i and j are in the same domain */ | |
656 | ||
657 | if (match_pdomain->num_processors != count_target) { | |
658 | retval = -EINVAL; | |
659 | goto err_ret; | |
660 | } | |
661 | ||
662 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
663 | retval = -EINVAL; | |
664 | goto err_ret; | |
665 | } | |
666 | ||
2fdf66b4 RR |
667 | cpumask_set_cpu(j, covered_cpus); |
668 | cpumask_set_cpu(j, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
669 | count++; |
670 | } | |
671 | ||
193de0c7 | 672 | for_each_possible_cpu(j) { |
3b2d9942 VP |
673 | if (i == j) |
674 | continue; | |
675 | ||
706546d0 | 676 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
677 | if (!match_pr) |
678 | continue; | |
679 | ||
680 | match_pdomain = &(match_pr->performance->domain_info); | |
681 | if (match_pdomain->domain != pdomain->domain) | |
682 | continue; | |
683 | ||
684 | match_pr->performance->shared_type = | |
685 | pr->performance->shared_type; | |
2fdf66b4 RR |
686 | cpumask_copy(match_pr->performance->shared_cpu_map, |
687 | pr->performance->shared_cpu_map); | |
3b2d9942 VP |
688 | } |
689 | } | |
690 | ||
691 | err_ret: | |
193de0c7 | 692 | for_each_possible_cpu(i) { |
706546d0 | 693 | pr = per_cpu(processors, i); |
3b2d9942 VP |
694 | if (!pr || !pr->performance) |
695 | continue; | |
696 | ||
697 | /* Assume no coordination on any error parsing domain info */ | |
698 | if (retval) { | |
2fdf66b4 RR |
699 | cpumask_clear(pr->performance->shared_cpu_map); |
700 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
701 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
702 | } | |
703 | pr->performance = NULL; /* Will be set for real in register */ | |
704 | } | |
705 | ||
e1eb4779 | 706 | err_out: |
785fcccd | 707 | mutex_unlock(&performance_mutex); |
2fdf66b4 | 708 | free_cpumask_var(covered_cpus); |
9011bff4 | 709 | return retval; |
3b2d9942 VP |
710 | } |
711 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
712 | ||
1da177e4 | 713 | int |
4be44fcd LB |
714 | acpi_processor_register_performance(struct acpi_processor_performance |
715 | *performance, unsigned int cpu) | |
1da177e4 LT |
716 | { |
717 | struct acpi_processor *pr; | |
718 | ||
1da177e4 | 719 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
d550d98d | 720 | return -EINVAL; |
1da177e4 | 721 | |
65c19bbd | 722 | mutex_lock(&performance_mutex); |
1da177e4 | 723 | |
706546d0 | 724 | pr = per_cpu(processors, cpu); |
1da177e4 | 725 | if (!pr) { |
65c19bbd | 726 | mutex_unlock(&performance_mutex); |
d550d98d | 727 | return -ENODEV; |
1da177e4 LT |
728 | } |
729 | ||
730 | if (pr->performance) { | |
65c19bbd | 731 | mutex_unlock(&performance_mutex); |
d550d98d | 732 | return -EBUSY; |
1da177e4 LT |
733 | } |
734 | ||
a913f507 AM |
735 | WARN_ON(!performance); |
736 | ||
1da177e4 LT |
737 | pr->performance = performance; |
738 | ||
739 | if (acpi_processor_get_performance_info(pr)) { | |
740 | pr->performance = NULL; | |
65c19bbd | 741 | mutex_unlock(&performance_mutex); |
d550d98d | 742 | return -EIO; |
1da177e4 LT |
743 | } |
744 | ||
65c19bbd | 745 | mutex_unlock(&performance_mutex); |
d550d98d | 746 | return 0; |
1da177e4 | 747 | } |
1da177e4 | 748 | |
4be44fcd | 749 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
750 | |
751 | void | |
4be44fcd LB |
752 | acpi_processor_unregister_performance(struct acpi_processor_performance |
753 | *performance, unsigned int cpu) | |
1da177e4 LT |
754 | { |
755 | struct acpi_processor *pr; | |
756 | ||
65c19bbd | 757 | mutex_lock(&performance_mutex); |
1da177e4 | 758 | |
706546d0 | 759 | pr = per_cpu(processors, cpu); |
1da177e4 | 760 | if (!pr) { |
65c19bbd | 761 | mutex_unlock(&performance_mutex); |
d550d98d | 762 | return; |
1da177e4 LT |
763 | } |
764 | ||
a913f507 AM |
765 | if (pr->performance) |
766 | kfree(pr->performance->states); | |
1da177e4 LT |
767 | pr->performance = NULL; |
768 | ||
65c19bbd | 769 | mutex_unlock(&performance_mutex); |
1da177e4 | 770 | |
d550d98d | 771 | return; |
1da177e4 | 772 | } |
4be44fcd | 773 | |
1da177e4 | 774 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |