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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 | ||
16be87ea | 34 | #ifdef CONFIG_X86 |
910dfae2 | 35 | #include <asm/cpufeature.h> |
16be87ea | 36 | #endif |
1da177e4 LT |
37 | |
38 | #include <acpi/acpi_bus.h> | |
89595b8f | 39 | #include <acpi/acpi_drivers.h> |
1da177e4 LT |
40 | #include <acpi/processor.h> |
41 | ||
1da177e4 | 42 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 LT |
43 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
44 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
f52fd66d | 45 | ACPI_MODULE_NAME("processor_perflib"); |
1da177e4 | 46 | |
65c19bbd | 47 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 | 48 | |
919158d1 TR |
49 | /* Use cpufreq debug layer for _PPC changes. */ |
50 | #define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \ | |
51 | "cpufreq-core", msg) | |
52 | ||
1da177e4 LT |
53 | /* |
54 | * _PPC support is implemented as a CPUfreq policy notifier: | |
55 | * This means each time a CPUfreq driver registered also with | |
56 | * the ACPI core is asked to change the speed policy, the maximum | |
57 | * value is adjusted so that it is within the platform limit. | |
58 | * | |
59 | * Also, when a new platform limit value is detected, the CPUfreq | |
60 | * policy is adjusted accordingly. | |
61 | */ | |
62 | ||
a1531acd TR |
63 | /* ignore_ppc: |
64 | * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet | |
65 | * ignore _PPC | |
66 | * 0 -> cpufreq low level drivers initialized -> consider _PPC values | |
67 | * 1 -> ignore _PPC totally -> forced by user through boot param | |
68 | */ | |
9f497bcc | 69 | static int ignore_ppc = -1; |
613e5f33 | 70 | module_param(ignore_ppc, int, 0644); |
623b78c3 TR |
71 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
72 | "limited by BIOS, this should help"); | |
73 | ||
1da177e4 LT |
74 | #define PPC_REGISTERED 1 |
75 | #define PPC_IN_USE 2 | |
76 | ||
a1531acd | 77 | static int acpi_processor_ppc_status; |
1da177e4 LT |
78 | |
79 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 80 | unsigned long event, void *data) |
1da177e4 LT |
81 | { |
82 | struct cpufreq_policy *policy = data; | |
83 | struct acpi_processor *pr; | |
84 | unsigned int ppc = 0; | |
85 | ||
a1531acd TR |
86 | if (event == CPUFREQ_START && ignore_ppc <= 0) { |
87 | ignore_ppc = 0; | |
88 | return 0; | |
89 | } | |
90 | ||
623b78c3 TR |
91 | if (ignore_ppc) |
92 | return 0; | |
93 | ||
1da177e4 | 94 | if (event != CPUFREQ_INCOMPATIBLE) |
9b67c5d4 TR |
95 | return 0; |
96 | ||
97 | mutex_lock(&performance_mutex); | |
1da177e4 | 98 | |
706546d0 | 99 | pr = per_cpu(processors, policy->cpu); |
1da177e4 LT |
100 | if (!pr || !pr->performance) |
101 | goto out; | |
102 | ||
4be44fcd | 103 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 104 | |
0916bd3e | 105 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
106 | goto out; |
107 | ||
108 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
109 | pr->performance->states[ppc]. |
110 | core_frequency * 1000); | |
1da177e4 | 111 | |
4be44fcd | 112 | out: |
65c19bbd | 113 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
114 | |
115 | return 0; | |
116 | } | |
117 | ||
1da177e4 LT |
118 | static struct notifier_block acpi_ppc_notifier_block = { |
119 | .notifier_call = acpi_processor_ppc_notifier, | |
120 | }; | |
121 | ||
4be44fcd | 122 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 123 | { |
4be44fcd | 124 | acpi_status status = 0; |
27663c58 | 125 | unsigned long long ppc = 0; |
1da177e4 | 126 | |
1da177e4 LT |
127 | |
128 | if (!pr) | |
d550d98d | 129 | return -EINVAL; |
1da177e4 LT |
130 | |
131 | /* | |
132 | * _PPC indicates the maximum state currently supported by the platform | |
133 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
134 | */ | |
135 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
136 | ||
137 | if (status != AE_NOT_FOUND) | |
138 | acpi_processor_ppc_status |= PPC_IN_USE; | |
139 | ||
4be44fcd | 140 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 141 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 142 | return -ENODEV; |
1da177e4 LT |
143 | } |
144 | ||
919158d1 TR |
145 | cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
146 | (int)ppc, ppc ? "" : "not"); | |
147 | ||
4be44fcd | 148 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 149 | |
d550d98d | 150 | return 0; |
1da177e4 LT |
151 | } |
152 | ||
4be44fcd | 153 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr) |
1da177e4 | 154 | { |
623b78c3 TR |
155 | int ret; |
156 | ||
157 | if (ignore_ppc) | |
158 | return 0; | |
159 | ||
160 | ret = acpi_processor_get_platform_limit(pr); | |
161 | ||
1da177e4 LT |
162 | if (ret < 0) |
163 | return (ret); | |
164 | else | |
165 | return cpufreq_update_policy(pr->id); | |
166 | } | |
167 | ||
4be44fcd LB |
168 | void acpi_processor_ppc_init(void) |
169 | { | |
170 | if (!cpufreq_register_notifier | |
171 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
172 | acpi_processor_ppc_status |= PPC_REGISTERED; |
173 | else | |
4be44fcd LB |
174 | printk(KERN_DEBUG |
175 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
176 | } |
177 | ||
4be44fcd LB |
178 | void acpi_processor_ppc_exit(void) |
179 | { | |
1da177e4 | 180 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
181 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
182 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
183 | |
184 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
185 | } | |
186 | ||
4be44fcd | 187 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 188 | { |
4be44fcd LB |
189 | int result = 0; |
190 | acpi_status status = 0; | |
191 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
192 | union acpi_object *pct = NULL; | |
193 | union acpi_object obj = { 0 }; | |
1da177e4 | 194 | |
1da177e4 LT |
195 | |
196 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 197 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 198 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 199 | return -ENODEV; |
1da177e4 LT |
200 | } |
201 | ||
4be44fcd | 202 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 203 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 204 | || (pct->package.count != 2)) { |
6468463a | 205 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
206 | result = -EFAULT; |
207 | goto end; | |
208 | } | |
209 | ||
210 | /* | |
211 | * control_register | |
212 | */ | |
213 | ||
214 | obj = pct->package.elements[0]; | |
215 | ||
216 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
217 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
218 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 219 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
220 | result = -EFAULT; |
221 | goto end; | |
222 | } | |
4be44fcd LB |
223 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
224 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
225 | |
226 | /* | |
227 | * status_register | |
228 | */ | |
229 | ||
230 | obj = pct->package.elements[1]; | |
231 | ||
232 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
233 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
234 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 235 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
236 | result = -EFAULT; |
237 | goto end; | |
238 | } | |
239 | ||
4be44fcd LB |
240 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
241 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 242 | |
4be44fcd | 243 | end: |
02438d87 | 244 | kfree(buffer.pointer); |
1da177e4 | 245 | |
d550d98d | 246 | return result; |
1da177e4 LT |
247 | } |
248 | ||
4be44fcd | 249 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 250 | { |
4be44fcd LB |
251 | int result = 0; |
252 | acpi_status status = AE_OK; | |
253 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
254 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
255 | struct acpi_buffer state = { 0, NULL }; | |
256 | union acpi_object *pss = NULL; | |
257 | int i; | |
1da177e4 | 258 | |
1da177e4 LT |
259 | |
260 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 261 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 262 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 263 | return -ENODEV; |
1da177e4 LT |
264 | } |
265 | ||
50dd0969 | 266 | pss = buffer.pointer; |
1da177e4 | 267 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 268 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
269 | result = -EFAULT; |
270 | goto end; | |
271 | } | |
272 | ||
273 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 274 | pss->package.count)); |
1da177e4 LT |
275 | |
276 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
277 | pr->performance->states = |
278 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
279 | GFP_KERNEL); | |
1da177e4 LT |
280 | if (!pr->performance->states) { |
281 | result = -ENOMEM; | |
282 | goto end; | |
283 | } | |
284 | ||
285 | for (i = 0; i < pr->performance->state_count; i++) { | |
286 | ||
287 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
288 | ||
289 | state.length = sizeof(struct acpi_processor_px); | |
290 | state.pointer = px; | |
291 | ||
292 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
293 | ||
294 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 295 | &format, &state); |
1da177e4 | 296 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 297 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
298 | result = -EFAULT; |
299 | kfree(pr->performance->states); | |
300 | goto end; | |
301 | } | |
302 | ||
303 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
304 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
305 | i, | |
306 | (u32) px->core_frequency, | |
307 | (u32) px->power, | |
308 | (u32) px->transition_latency, | |
309 | (u32) px->bus_master_latency, | |
310 | (u32) px->control, (u32) px->status)); | |
1da177e4 LT |
311 | |
312 | if (!px->core_frequency) { | |
6468463a LB |
313 | printk(KERN_ERR PREFIX |
314 | "Invalid _PSS data: freq is zero\n"); | |
1da177e4 LT |
315 | result = -EFAULT; |
316 | kfree(pr->performance->states); | |
317 | goto end; | |
318 | } | |
319 | } | |
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_info(struct acpi_processor *pr) |
1da177e4 | 328 | { |
4be44fcd LB |
329 | int result = 0; |
330 | acpi_status status = AE_OK; | |
331 | acpi_handle handle = NULL; | |
1da177e4 | 332 | |
1da177e4 | 333 | if (!pr || !pr->performance || !pr->handle) |
d550d98d | 334 | return -EINVAL; |
1da177e4 | 335 | |
1da177e4 LT |
336 | status = acpi_get_handle(pr->handle, "_PCT", &handle); |
337 | if (ACPI_FAILURE(status)) { | |
338 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 339 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 340 | return -ENODEV; |
1da177e4 LT |
341 | } |
342 | ||
343 | result = acpi_processor_get_performance_control(pr); | |
344 | if (result) | |
910dfae2 | 345 | goto update_bios; |
1da177e4 LT |
346 | |
347 | result = acpi_processor_get_performance_states(pr); | |
348 | if (result) | |
910dfae2 | 349 | goto update_bios; |
1da177e4 | 350 | |
d550d98d | 351 | return 0; |
910dfae2 TR |
352 | |
353 | /* | |
354 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that | |
355 | * the BIOS is older than the CPU and does not know its frequencies | |
356 | */ | |
357 | update_bios: | |
16be87ea | 358 | #ifdef CONFIG_X86 |
910dfae2 TR |
359 | if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){ |
360 | if(boot_cpu_has(X86_FEATURE_EST)) | |
361 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " | |
362 | "frequency support\n"); | |
363 | } | |
16be87ea | 364 | #endif |
910dfae2 | 365 | return result; |
1da177e4 LT |
366 | } |
367 | ||
4be44fcd LB |
368 | int acpi_processor_notify_smm(struct module *calling_module) |
369 | { | |
370 | acpi_status status; | |
371 | static int is_done = 0; | |
1da177e4 | 372 | |
1da177e4 LT |
373 | |
374 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 375 | return -EBUSY; |
1da177e4 LT |
376 | |
377 | if (!try_module_get(calling_module)) | |
d550d98d | 378 | return -EINVAL; |
1da177e4 LT |
379 | |
380 | /* is_done is set to negative if an error occured, | |
381 | * and to postitive if _no_ error occured, but SMM | |
382 | * was already notified. This avoids double notification | |
383 | * which might lead to unexpected results... | |
384 | */ | |
385 | if (is_done > 0) { | |
386 | module_put(calling_module); | |
d550d98d | 387 | return 0; |
4be44fcd | 388 | } else if (is_done < 0) { |
1da177e4 | 389 | module_put(calling_module); |
d550d98d | 390 | return is_done; |
1da177e4 LT |
391 | } |
392 | ||
393 | is_done = -EIO; | |
394 | ||
ad71860a | 395 | /* Can't write pstate_control to smi_command if either value is zero */ |
cee324b1 | 396 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
ad71860a | 397 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 398 | module_put(calling_module); |
d550d98d | 399 | return 0; |
1da177e4 LT |
400 | } |
401 | ||
4be44fcd | 402 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a | 403 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
cee324b1 | 404 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
1da177e4 | 405 | |
cee324b1 AS |
406 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
407 | (u32) acpi_gbl_FADT.pstate_control, 8); | |
4be44fcd | 408 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 409 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a | 410 | "Failed to write pstate_control [0x%x] to " |
cee324b1 AS |
411 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
412 | acpi_gbl_FADT.smi_command)); | |
1da177e4 | 413 | module_put(calling_module); |
d550d98d | 414 | return status; |
1da177e4 LT |
415 | } |
416 | ||
417 | /* Success. If there's no _PPC, we need to fear nothing, so | |
418 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
419 | is_done = 1; | |
420 | ||
421 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
422 | module_put(calling_module); | |
423 | ||
d550d98d | 424 | return 0; |
1da177e4 | 425 | } |
1da177e4 | 426 | |
4be44fcd | 427 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 | 428 | |
3b2d9942 VP |
429 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
430 | { | |
431 | int result = 0; | |
432 | acpi_status status = AE_OK; | |
433 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
434 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
435 | struct acpi_buffer state = {0, NULL}; | |
436 | union acpi_object *psd = NULL; | |
437 | struct acpi_psd_package *pdomain; | |
438 | ||
3b2d9942 VP |
439 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
440 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 441 | return -ENODEV; |
3b2d9942 VP |
442 | } |
443 | ||
50dd0969 | 444 | psd = buffer.pointer; |
3b2d9942 | 445 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
55ac9a01 | 446 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
447 | result = -EFAULT; |
448 | goto end; | |
449 | } | |
450 | ||
451 | if (psd->package.count != 1) { | |
55ac9a01 | 452 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
453 | result = -EFAULT; |
454 | goto end; | |
455 | } | |
456 | ||
457 | pdomain = &(pr->performance->domain_info); | |
458 | ||
459 | state.length = sizeof(struct acpi_psd_package); | |
460 | state.pointer = pdomain; | |
461 | ||
462 | status = acpi_extract_package(&(psd->package.elements[0]), | |
463 | &format, &state); | |
464 | if (ACPI_FAILURE(status)) { | |
55ac9a01 | 465 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
466 | result = -EFAULT; |
467 | goto end; | |
468 | } | |
469 | ||
470 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
55ac9a01 | 471 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
3b2d9942 VP |
472 | result = -EFAULT; |
473 | goto end; | |
474 | } | |
475 | ||
476 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
55ac9a01 | 477 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
3b2d9942 VP |
478 | result = -EFAULT; |
479 | goto end; | |
480 | } | |
481 | ||
482 | end: | |
02438d87 | 483 | kfree(buffer.pointer); |
9011bff4 | 484 | return result; |
3b2d9942 VP |
485 | } |
486 | ||
487 | int acpi_processor_preregister_performance( | |
50109292 | 488 | struct acpi_processor_performance *performance) |
3b2d9942 VP |
489 | { |
490 | int count, count_target; | |
491 | int retval = 0; | |
492 | unsigned int i, j; | |
2fdf66b4 | 493 | cpumask_var_t covered_cpus; |
3b2d9942 VP |
494 | struct acpi_processor *pr; |
495 | struct acpi_psd_package *pdomain; | |
496 | struct acpi_processor *match_pr; | |
497 | struct acpi_psd_package *match_pdomain; | |
498 | ||
2fdf66b4 RR |
499 | if (!alloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
500 | return -ENOMEM; | |
501 | ||
785fcccd | 502 | mutex_lock(&performance_mutex); |
3b2d9942 VP |
503 | |
504 | retval = 0; | |
505 | ||
506 | /* Call _PSD for all CPUs */ | |
193de0c7 | 507 | for_each_possible_cpu(i) { |
706546d0 | 508 | pr = per_cpu(processors, i); |
3b2d9942 VP |
509 | if (!pr) { |
510 | /* Look only at processors in ACPI namespace */ | |
511 | continue; | |
512 | } | |
513 | ||
514 | if (pr->performance) { | |
515 | retval = -EBUSY; | |
516 | continue; | |
517 | } | |
518 | ||
50109292 | 519 | if (!performance || !percpu_ptr(performance, i)) { |
3b2d9942 VP |
520 | retval = -EINVAL; |
521 | continue; | |
522 | } | |
523 | ||
50109292 | 524 | pr->performance = percpu_ptr(performance, i); |
2fdf66b4 | 525 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
3b2d9942 VP |
526 | if (acpi_processor_get_psd(pr)) { |
527 | retval = -EINVAL; | |
528 | continue; | |
529 | } | |
530 | } | |
531 | if (retval) | |
532 | goto err_ret; | |
533 | ||
534 | /* | |
535 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
536 | * domain info. | |
537 | */ | |
193de0c7 | 538 | for_each_possible_cpu(i) { |
706546d0 | 539 | pr = per_cpu(processors, i); |
3b2d9942 VP |
540 | if (!pr) |
541 | continue; | |
542 | ||
543 | /* Basic validity check for domain info */ | |
544 | pdomain = &(pr->performance->domain_info); | |
545 | if ((pdomain->revision != ACPI_PSD_REV0_REVISION) || | |
546 | (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) { | |
547 | retval = -EINVAL; | |
548 | goto err_ret; | |
549 | } | |
550 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
551 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
552 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
553 | retval = -EINVAL; | |
554 | goto err_ret; | |
555 | } | |
556 | } | |
557 | ||
2fdf66b4 | 558 | cpumask_clear(covered_cpus); |
193de0c7 | 559 | for_each_possible_cpu(i) { |
706546d0 | 560 | pr = per_cpu(processors, i); |
3b2d9942 VP |
561 | if (!pr) |
562 | continue; | |
563 | ||
2fdf66b4 | 564 | if (cpumask_test_cpu(i, covered_cpus)) |
3b2d9942 VP |
565 | continue; |
566 | ||
567 | pdomain = &(pr->performance->domain_info); | |
2fdf66b4 RR |
568 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
569 | cpumask_set_cpu(i, covered_cpus); | |
3b2d9942 VP |
570 | if (pdomain->num_processors <= 1) |
571 | continue; | |
572 | ||
573 | /* Validate the Domain info */ | |
574 | count_target = pdomain->num_processors; | |
575 | count = 1; | |
46f18e3a | 576 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 577 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
578 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
579 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
580 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 581 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 582 | |
193de0c7 | 583 | for_each_possible_cpu(j) { |
3b2d9942 VP |
584 | if (i == j) |
585 | continue; | |
586 | ||
706546d0 | 587 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
588 | if (!match_pr) |
589 | continue; | |
590 | ||
591 | match_pdomain = &(match_pr->performance->domain_info); | |
592 | if (match_pdomain->domain != pdomain->domain) | |
593 | continue; | |
594 | ||
595 | /* Here i and j are in the same domain */ | |
596 | ||
597 | if (match_pdomain->num_processors != count_target) { | |
598 | retval = -EINVAL; | |
599 | goto err_ret; | |
600 | } | |
601 | ||
602 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
603 | retval = -EINVAL; | |
604 | goto err_ret; | |
605 | } | |
606 | ||
2fdf66b4 RR |
607 | cpumask_set_cpu(j, covered_cpus); |
608 | cpumask_set_cpu(j, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
609 | count++; |
610 | } | |
611 | ||
193de0c7 | 612 | for_each_possible_cpu(j) { |
3b2d9942 VP |
613 | if (i == j) |
614 | continue; | |
615 | ||
706546d0 | 616 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
617 | if (!match_pr) |
618 | continue; | |
619 | ||
620 | match_pdomain = &(match_pr->performance->domain_info); | |
621 | if (match_pdomain->domain != pdomain->domain) | |
622 | continue; | |
623 | ||
624 | match_pr->performance->shared_type = | |
625 | pr->performance->shared_type; | |
2fdf66b4 RR |
626 | cpumask_copy(match_pr->performance->shared_cpu_map, |
627 | pr->performance->shared_cpu_map); | |
3b2d9942 VP |
628 | } |
629 | } | |
630 | ||
631 | err_ret: | |
193de0c7 | 632 | for_each_possible_cpu(i) { |
706546d0 | 633 | pr = per_cpu(processors, i); |
3b2d9942 VP |
634 | if (!pr || !pr->performance) |
635 | continue; | |
636 | ||
637 | /* Assume no coordination on any error parsing domain info */ | |
638 | if (retval) { | |
2fdf66b4 RR |
639 | cpumask_clear(pr->performance->shared_cpu_map); |
640 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
641 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
642 | } | |
643 | pr->performance = NULL; /* Will be set for real in register */ | |
644 | } | |
645 | ||
785fcccd | 646 | mutex_unlock(&performance_mutex); |
2fdf66b4 | 647 | free_cpumask_var(covered_cpus); |
9011bff4 | 648 | return retval; |
3b2d9942 VP |
649 | } |
650 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
651 | ||
1da177e4 | 652 | int |
4be44fcd LB |
653 | acpi_processor_register_performance(struct acpi_processor_performance |
654 | *performance, unsigned int cpu) | |
1da177e4 LT |
655 | { |
656 | struct acpi_processor *pr; | |
657 | ||
1da177e4 | 658 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
d550d98d | 659 | return -EINVAL; |
1da177e4 | 660 | |
65c19bbd | 661 | mutex_lock(&performance_mutex); |
1da177e4 | 662 | |
706546d0 | 663 | pr = per_cpu(processors, cpu); |
1da177e4 | 664 | if (!pr) { |
65c19bbd | 665 | mutex_unlock(&performance_mutex); |
d550d98d | 666 | return -ENODEV; |
1da177e4 LT |
667 | } |
668 | ||
669 | if (pr->performance) { | |
65c19bbd | 670 | mutex_unlock(&performance_mutex); |
d550d98d | 671 | return -EBUSY; |
1da177e4 LT |
672 | } |
673 | ||
a913f507 AM |
674 | WARN_ON(!performance); |
675 | ||
1da177e4 LT |
676 | pr->performance = performance; |
677 | ||
678 | if (acpi_processor_get_performance_info(pr)) { | |
679 | pr->performance = NULL; | |
65c19bbd | 680 | mutex_unlock(&performance_mutex); |
d550d98d | 681 | return -EIO; |
1da177e4 LT |
682 | } |
683 | ||
65c19bbd | 684 | mutex_unlock(&performance_mutex); |
d550d98d | 685 | return 0; |
1da177e4 | 686 | } |
1da177e4 | 687 | |
4be44fcd | 688 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
689 | |
690 | void | |
4be44fcd LB |
691 | acpi_processor_unregister_performance(struct acpi_processor_performance |
692 | *performance, unsigned int cpu) | |
1da177e4 LT |
693 | { |
694 | struct acpi_processor *pr; | |
695 | ||
65c19bbd | 696 | mutex_lock(&performance_mutex); |
1da177e4 | 697 | |
706546d0 | 698 | pr = per_cpu(processors, cpu); |
1da177e4 | 699 | if (!pr) { |
65c19bbd | 700 | mutex_unlock(&performance_mutex); |
d550d98d | 701 | return; |
1da177e4 LT |
702 | } |
703 | ||
a913f507 AM |
704 | if (pr->performance) |
705 | kfree(pr->performance->states); | |
1da177e4 LT |
706 | pr->performance = NULL; |
707 | ||
65c19bbd | 708 | mutex_unlock(&performance_mutex); |
1da177e4 | 709 | |
d550d98d | 710 | return; |
1da177e4 | 711 | } |
4be44fcd | 712 | |
1da177e4 | 713 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |