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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 | ||
a192a958 LB |
42 | #define PREFIX "ACPI: " |
43 | ||
1da177e4 | 44 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 LT |
45 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
46 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
f52fd66d | 47 | ACPI_MODULE_NAME("processor_perflib"); |
1da177e4 | 48 | |
65c19bbd | 49 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 | 50 | |
919158d1 TR |
51 | /* Use cpufreq debug layer for _PPC changes. */ |
52 | #define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \ | |
53 | "cpufreq-core", msg) | |
54 | ||
1da177e4 LT |
55 | /* |
56 | * _PPC support is implemented as a CPUfreq policy notifier: | |
57 | * This means each time a CPUfreq driver registered also with | |
58 | * the ACPI core is asked to change the speed policy, the maximum | |
59 | * value is adjusted so that it is within the platform limit. | |
60 | * | |
61 | * Also, when a new platform limit value is detected, the CPUfreq | |
62 | * policy is adjusted accordingly. | |
63 | */ | |
64 | ||
a1531acd TR |
65 | /* ignore_ppc: |
66 | * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet | |
67 | * ignore _PPC | |
68 | * 0 -> cpufreq low level drivers initialized -> consider _PPC values | |
69 | * 1 -> ignore _PPC totally -> forced by user through boot param | |
70 | */ | |
9f497bcc | 71 | static int ignore_ppc = -1; |
613e5f33 | 72 | module_param(ignore_ppc, int, 0644); |
623b78c3 TR |
73 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
74 | "limited by BIOS, this should help"); | |
75 | ||
1da177e4 LT |
76 | #define PPC_REGISTERED 1 |
77 | #define PPC_IN_USE 2 | |
78 | ||
a1531acd | 79 | static int acpi_processor_ppc_status; |
1da177e4 LT |
80 | |
81 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 82 | unsigned long event, void *data) |
1da177e4 LT |
83 | { |
84 | struct cpufreq_policy *policy = data; | |
85 | struct acpi_processor *pr; | |
86 | unsigned int ppc = 0; | |
87 | ||
a1531acd TR |
88 | if (event == CPUFREQ_START && ignore_ppc <= 0) { |
89 | ignore_ppc = 0; | |
90 | return 0; | |
91 | } | |
92 | ||
623b78c3 TR |
93 | if (ignore_ppc) |
94 | return 0; | |
95 | ||
1da177e4 | 96 | if (event != CPUFREQ_INCOMPATIBLE) |
9b67c5d4 TR |
97 | return 0; |
98 | ||
99 | mutex_lock(&performance_mutex); | |
1da177e4 | 100 | |
706546d0 | 101 | pr = per_cpu(processors, policy->cpu); |
1da177e4 LT |
102 | if (!pr || !pr->performance) |
103 | goto out; | |
104 | ||
4be44fcd | 105 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 106 | |
0916bd3e | 107 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
108 | goto out; |
109 | ||
110 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
111 | pr->performance->states[ppc]. |
112 | core_frequency * 1000); | |
1da177e4 | 113 | |
4be44fcd | 114 | out: |
65c19bbd | 115 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
116 | |
117 | return 0; | |
118 | } | |
119 | ||
1da177e4 LT |
120 | static struct notifier_block acpi_ppc_notifier_block = { |
121 | .notifier_call = acpi_processor_ppc_notifier, | |
122 | }; | |
123 | ||
4be44fcd | 124 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 125 | { |
4be44fcd | 126 | acpi_status status = 0; |
27663c58 | 127 | unsigned long long ppc = 0; |
1da177e4 | 128 | |
1da177e4 LT |
129 | |
130 | if (!pr) | |
d550d98d | 131 | return -EINVAL; |
1da177e4 LT |
132 | |
133 | /* | |
134 | * _PPC indicates the maximum state currently supported by the platform | |
135 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
136 | */ | |
137 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
138 | ||
139 | if (status != AE_NOT_FOUND) | |
140 | acpi_processor_ppc_status |= PPC_IN_USE; | |
141 | ||
4be44fcd | 142 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 143 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 144 | return -ENODEV; |
1da177e4 LT |
145 | } |
146 | ||
919158d1 TR |
147 | cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
148 | (int)ppc, ppc ? "" : "not"); | |
149 | ||
4be44fcd | 150 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 151 | |
d550d98d | 152 | return 0; |
1da177e4 LT |
153 | } |
154 | ||
4be44fcd | 155 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr) |
1da177e4 | 156 | { |
623b78c3 TR |
157 | int ret; |
158 | ||
159 | if (ignore_ppc) | |
160 | return 0; | |
161 | ||
162 | ret = acpi_processor_get_platform_limit(pr); | |
163 | ||
1da177e4 LT |
164 | if (ret < 0) |
165 | return (ret); | |
166 | else | |
167 | return cpufreq_update_policy(pr->id); | |
168 | } | |
169 | ||
4be44fcd LB |
170 | void acpi_processor_ppc_init(void) |
171 | { | |
172 | if (!cpufreq_register_notifier | |
173 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
174 | acpi_processor_ppc_status |= PPC_REGISTERED; |
175 | else | |
4be44fcd LB |
176 | printk(KERN_DEBUG |
177 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
178 | } |
179 | ||
4be44fcd LB |
180 | void acpi_processor_ppc_exit(void) |
181 | { | |
1da177e4 | 182 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
183 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
184 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
185 | |
186 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
187 | } | |
188 | ||
4be44fcd | 189 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 190 | { |
4be44fcd LB |
191 | int result = 0; |
192 | acpi_status status = 0; | |
193 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
194 | union acpi_object *pct = NULL; | |
195 | union acpi_object obj = { 0 }; | |
1da177e4 | 196 | |
1da177e4 LT |
197 | |
198 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 199 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 200 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 201 | return -ENODEV; |
1da177e4 LT |
202 | } |
203 | ||
4be44fcd | 204 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 205 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 206 | || (pct->package.count != 2)) { |
6468463a | 207 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
208 | result = -EFAULT; |
209 | goto end; | |
210 | } | |
211 | ||
212 | /* | |
213 | * control_register | |
214 | */ | |
215 | ||
216 | obj = pct->package.elements[0]; | |
217 | ||
218 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
219 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
220 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 221 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
222 | result = -EFAULT; |
223 | goto end; | |
224 | } | |
4be44fcd LB |
225 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
226 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
227 | |
228 | /* | |
229 | * status_register | |
230 | */ | |
231 | ||
232 | obj = pct->package.elements[1]; | |
233 | ||
234 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
235 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
236 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 237 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
238 | result = -EFAULT; |
239 | goto end; | |
240 | } | |
241 | ||
4be44fcd LB |
242 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
243 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 244 | |
4be44fcd | 245 | end: |
02438d87 | 246 | kfree(buffer.pointer); |
1da177e4 | 247 | |
d550d98d | 248 | return result; |
1da177e4 LT |
249 | } |
250 | ||
4be44fcd | 251 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 252 | { |
4be44fcd LB |
253 | int result = 0; |
254 | acpi_status status = AE_OK; | |
255 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
256 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
257 | struct acpi_buffer state = { 0, NULL }; | |
258 | union acpi_object *pss = NULL; | |
259 | int i; | |
1da177e4 | 260 | |
1da177e4 LT |
261 | |
262 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 263 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 264 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 265 | return -ENODEV; |
1da177e4 LT |
266 | } |
267 | ||
50dd0969 | 268 | pss = buffer.pointer; |
1da177e4 | 269 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 270 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
271 | result = -EFAULT; |
272 | goto end; | |
273 | } | |
274 | ||
275 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 276 | pss->package.count)); |
1da177e4 LT |
277 | |
278 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
279 | pr->performance->states = |
280 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
281 | GFP_KERNEL); | |
1da177e4 LT |
282 | if (!pr->performance->states) { |
283 | result = -ENOMEM; | |
284 | goto end; | |
285 | } | |
286 | ||
287 | for (i = 0; i < pr->performance->state_count; i++) { | |
288 | ||
289 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
290 | ||
291 | state.length = sizeof(struct acpi_processor_px); | |
292 | state.pointer = px; | |
293 | ||
294 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
295 | ||
296 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 297 | &format, &state); |
1da177e4 | 298 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 299 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
300 | result = -EFAULT; |
301 | kfree(pr->performance->states); | |
302 | goto end; | |
303 | } | |
304 | ||
305 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
306 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
307 | i, | |
308 | (u32) px->core_frequency, | |
309 | (u32) px->power, | |
310 | (u32) px->transition_latency, | |
311 | (u32) px->bus_master_latency, | |
312 | (u32) px->control, (u32) px->status)); | |
1da177e4 | 313 | |
34d531e6 LB |
314 | /* |
315 | * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq | |
316 | */ | |
317 | if (!px->core_frequency || | |
318 | ((u32)(px->core_frequency * 1000) != | |
319 | (px->core_frequency * 1000))) { | |
320 | printk(KERN_ERR FW_BUG PREFIX | |
321 | "Invalid BIOS _PSS frequency: 0x%llx MHz\n", | |
322 | px->core_frequency); | |
1da177e4 LT |
323 | result = -EFAULT; |
324 | kfree(pr->performance->states); | |
325 | goto end; | |
326 | } | |
327 | } | |
328 | ||
4be44fcd | 329 | end: |
02438d87 | 330 | kfree(buffer.pointer); |
1da177e4 | 331 | |
d550d98d | 332 | return result; |
1da177e4 LT |
333 | } |
334 | ||
4be44fcd | 335 | static int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 336 | { |
4be44fcd LB |
337 | int result = 0; |
338 | acpi_status status = AE_OK; | |
339 | acpi_handle handle = NULL; | |
1da177e4 | 340 | |
1da177e4 | 341 | if (!pr || !pr->performance || !pr->handle) |
d550d98d | 342 | return -EINVAL; |
1da177e4 | 343 | |
1da177e4 LT |
344 | status = acpi_get_handle(pr->handle, "_PCT", &handle); |
345 | if (ACPI_FAILURE(status)) { | |
346 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 347 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 348 | return -ENODEV; |
1da177e4 LT |
349 | } |
350 | ||
351 | result = acpi_processor_get_performance_control(pr); | |
352 | if (result) | |
910dfae2 | 353 | goto update_bios; |
1da177e4 LT |
354 | |
355 | result = acpi_processor_get_performance_states(pr); | |
356 | if (result) | |
910dfae2 | 357 | goto update_bios; |
1da177e4 | 358 | |
d550d98d | 359 | return 0; |
910dfae2 TR |
360 | |
361 | /* | |
362 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that | |
363 | * the BIOS is older than the CPU and does not know its frequencies | |
364 | */ | |
365 | update_bios: | |
16be87ea | 366 | #ifdef CONFIG_X86 |
910dfae2 TR |
367 | if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){ |
368 | if(boot_cpu_has(X86_FEATURE_EST)) | |
369 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " | |
370 | "frequency support\n"); | |
371 | } | |
16be87ea | 372 | #endif |
910dfae2 | 373 | return result; |
1da177e4 LT |
374 | } |
375 | ||
4be44fcd LB |
376 | int acpi_processor_notify_smm(struct module *calling_module) |
377 | { | |
378 | acpi_status status; | |
379 | static int is_done = 0; | |
1da177e4 | 380 | |
1da177e4 LT |
381 | |
382 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 383 | return -EBUSY; |
1da177e4 LT |
384 | |
385 | if (!try_module_get(calling_module)) | |
d550d98d | 386 | return -EINVAL; |
1da177e4 LT |
387 | |
388 | /* is_done is set to negative if an error occured, | |
389 | * and to postitive if _no_ error occured, but SMM | |
390 | * was already notified. This avoids double notification | |
391 | * which might lead to unexpected results... | |
392 | */ | |
393 | if (is_done > 0) { | |
394 | module_put(calling_module); | |
d550d98d | 395 | return 0; |
4be44fcd | 396 | } else if (is_done < 0) { |
1da177e4 | 397 | module_put(calling_module); |
d550d98d | 398 | return is_done; |
1da177e4 LT |
399 | } |
400 | ||
401 | is_done = -EIO; | |
402 | ||
ad71860a | 403 | /* Can't write pstate_control to smi_command if either value is zero */ |
cee324b1 | 404 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
ad71860a | 405 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 406 | module_put(calling_module); |
d550d98d | 407 | return 0; |
1da177e4 LT |
408 | } |
409 | ||
4be44fcd | 410 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a | 411 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
cee324b1 | 412 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
1da177e4 | 413 | |
cee324b1 AS |
414 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
415 | (u32) acpi_gbl_FADT.pstate_control, 8); | |
4be44fcd | 416 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 417 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a | 418 | "Failed to write pstate_control [0x%x] to " |
cee324b1 AS |
419 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
420 | acpi_gbl_FADT.smi_command)); | |
1da177e4 | 421 | module_put(calling_module); |
d550d98d | 422 | return status; |
1da177e4 LT |
423 | } |
424 | ||
425 | /* Success. If there's no _PPC, we need to fear nothing, so | |
426 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
427 | is_done = 1; | |
428 | ||
429 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
430 | module_put(calling_module); | |
431 | ||
d550d98d | 432 | return 0; |
1da177e4 | 433 | } |
1da177e4 | 434 | |
4be44fcd | 435 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 | 436 | |
3b2d9942 VP |
437 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
438 | { | |
439 | int result = 0; | |
440 | acpi_status status = AE_OK; | |
441 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
442 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
443 | struct acpi_buffer state = {0, NULL}; | |
444 | union acpi_object *psd = NULL; | |
445 | struct acpi_psd_package *pdomain; | |
446 | ||
3b2d9942 VP |
447 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
448 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 449 | return -ENODEV; |
3b2d9942 VP |
450 | } |
451 | ||
50dd0969 | 452 | psd = buffer.pointer; |
3b2d9942 | 453 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
55ac9a01 | 454 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
455 | result = -EFAULT; |
456 | goto end; | |
457 | } | |
458 | ||
459 | if (psd->package.count != 1) { | |
55ac9a01 | 460 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
461 | result = -EFAULT; |
462 | goto end; | |
463 | } | |
464 | ||
465 | pdomain = &(pr->performance->domain_info); | |
466 | ||
467 | state.length = sizeof(struct acpi_psd_package); | |
468 | state.pointer = pdomain; | |
469 | ||
470 | status = acpi_extract_package(&(psd->package.elements[0]), | |
471 | &format, &state); | |
472 | if (ACPI_FAILURE(status)) { | |
55ac9a01 | 473 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
474 | result = -EFAULT; |
475 | goto end; | |
476 | } | |
477 | ||
478 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
55ac9a01 | 479 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
3b2d9942 VP |
480 | result = -EFAULT; |
481 | goto end; | |
482 | } | |
483 | ||
484 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
55ac9a01 | 485 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
3b2d9942 VP |
486 | result = -EFAULT; |
487 | goto end; | |
488 | } | |
489 | ||
e1eb4779 SG |
490 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
491 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
492 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
493 | printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); | |
494 | result = -EFAULT; | |
495 | goto end; | |
496 | } | |
3b2d9942 | 497 | end: |
02438d87 | 498 | kfree(buffer.pointer); |
9011bff4 | 499 | return result; |
3b2d9942 VP |
500 | } |
501 | ||
502 | int acpi_processor_preregister_performance( | |
50109292 | 503 | struct acpi_processor_performance *performance) |
3b2d9942 VP |
504 | { |
505 | int count, count_target; | |
506 | int retval = 0; | |
507 | unsigned int i, j; | |
2fdf66b4 | 508 | cpumask_var_t covered_cpus; |
3b2d9942 VP |
509 | struct acpi_processor *pr; |
510 | struct acpi_psd_package *pdomain; | |
511 | struct acpi_processor *match_pr; | |
512 | struct acpi_psd_package *match_pdomain; | |
513 | ||
79f55997 | 514 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
515 | return -ENOMEM; |
516 | ||
785fcccd | 517 | mutex_lock(&performance_mutex); |
3b2d9942 | 518 | |
e1eb4779 SG |
519 | /* |
520 | * Check if another driver has already registered, and abort before | |
521 | * changing pr->performance if it has. Check input data as well. | |
522 | */ | |
193de0c7 | 523 | for_each_possible_cpu(i) { |
706546d0 | 524 | pr = per_cpu(processors, i); |
3b2d9942 VP |
525 | if (!pr) { |
526 | /* Look only at processors in ACPI namespace */ | |
527 | continue; | |
528 | } | |
529 | ||
530 | if (pr->performance) { | |
531 | retval = -EBUSY; | |
e1eb4779 | 532 | goto err_out; |
3b2d9942 VP |
533 | } |
534 | ||
b36128c8 | 535 | if (!performance || !per_cpu_ptr(performance, i)) { |
3b2d9942 | 536 | retval = -EINVAL; |
e1eb4779 | 537 | goto err_out; |
3b2d9942 | 538 | } |
e1eb4779 SG |
539 | } |
540 | ||
541 | /* Call _PSD for all CPUs */ | |
542 | for_each_possible_cpu(i) { | |
543 | pr = per_cpu(processors, i); | |
544 | if (!pr) | |
545 | continue; | |
3b2d9942 | 546 | |
b36128c8 | 547 | pr->performance = per_cpu_ptr(performance, i); |
2fdf66b4 | 548 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
3b2d9942 VP |
549 | if (acpi_processor_get_psd(pr)) { |
550 | retval = -EINVAL; | |
551 | continue; | |
552 | } | |
553 | } | |
554 | if (retval) | |
555 | goto err_ret; | |
556 | ||
557 | /* | |
558 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
559 | * domain info. | |
560 | */ | |
193de0c7 | 561 | for_each_possible_cpu(i) { |
706546d0 | 562 | pr = per_cpu(processors, i); |
3b2d9942 VP |
563 | if (!pr) |
564 | continue; | |
565 | ||
2fdf66b4 | 566 | if (cpumask_test_cpu(i, covered_cpus)) |
3b2d9942 VP |
567 | continue; |
568 | ||
569 | pdomain = &(pr->performance->domain_info); | |
2fdf66b4 RR |
570 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
571 | cpumask_set_cpu(i, covered_cpus); | |
3b2d9942 VP |
572 | if (pdomain->num_processors <= 1) |
573 | continue; | |
574 | ||
575 | /* Validate the Domain info */ | |
576 | count_target = pdomain->num_processors; | |
577 | count = 1; | |
46f18e3a | 578 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 579 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
580 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
581 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
582 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 583 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 584 | |
193de0c7 | 585 | for_each_possible_cpu(j) { |
3b2d9942 VP |
586 | if (i == j) |
587 | continue; | |
588 | ||
706546d0 | 589 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
590 | if (!match_pr) |
591 | continue; | |
592 | ||
593 | match_pdomain = &(match_pr->performance->domain_info); | |
594 | if (match_pdomain->domain != pdomain->domain) | |
595 | continue; | |
596 | ||
597 | /* Here i and j are in the same domain */ | |
598 | ||
599 | if (match_pdomain->num_processors != count_target) { | |
600 | retval = -EINVAL; | |
601 | goto err_ret; | |
602 | } | |
603 | ||
604 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
605 | retval = -EINVAL; | |
606 | goto err_ret; | |
607 | } | |
608 | ||
2fdf66b4 RR |
609 | cpumask_set_cpu(j, covered_cpus); |
610 | cpumask_set_cpu(j, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
611 | count++; |
612 | } | |
613 | ||
193de0c7 | 614 | for_each_possible_cpu(j) { |
3b2d9942 VP |
615 | if (i == j) |
616 | continue; | |
617 | ||
706546d0 | 618 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
619 | if (!match_pr) |
620 | continue; | |
621 | ||
622 | match_pdomain = &(match_pr->performance->domain_info); | |
623 | if (match_pdomain->domain != pdomain->domain) | |
624 | continue; | |
625 | ||
626 | match_pr->performance->shared_type = | |
627 | pr->performance->shared_type; | |
2fdf66b4 RR |
628 | cpumask_copy(match_pr->performance->shared_cpu_map, |
629 | pr->performance->shared_cpu_map); | |
3b2d9942 VP |
630 | } |
631 | } | |
632 | ||
633 | err_ret: | |
193de0c7 | 634 | for_each_possible_cpu(i) { |
706546d0 | 635 | pr = per_cpu(processors, i); |
3b2d9942 VP |
636 | if (!pr || !pr->performance) |
637 | continue; | |
638 | ||
639 | /* Assume no coordination on any error parsing domain info */ | |
640 | if (retval) { | |
2fdf66b4 RR |
641 | cpumask_clear(pr->performance->shared_cpu_map); |
642 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
643 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
644 | } | |
645 | pr->performance = NULL; /* Will be set for real in register */ | |
646 | } | |
647 | ||
e1eb4779 | 648 | err_out: |
785fcccd | 649 | mutex_unlock(&performance_mutex); |
2fdf66b4 | 650 | free_cpumask_var(covered_cpus); |
9011bff4 | 651 | return retval; |
3b2d9942 VP |
652 | } |
653 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
654 | ||
1da177e4 | 655 | int |
4be44fcd LB |
656 | acpi_processor_register_performance(struct acpi_processor_performance |
657 | *performance, unsigned int cpu) | |
1da177e4 LT |
658 | { |
659 | struct acpi_processor *pr; | |
660 | ||
1da177e4 | 661 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
d550d98d | 662 | return -EINVAL; |
1da177e4 | 663 | |
65c19bbd | 664 | mutex_lock(&performance_mutex); |
1da177e4 | 665 | |
706546d0 | 666 | pr = per_cpu(processors, cpu); |
1da177e4 | 667 | if (!pr) { |
65c19bbd | 668 | mutex_unlock(&performance_mutex); |
d550d98d | 669 | return -ENODEV; |
1da177e4 LT |
670 | } |
671 | ||
672 | if (pr->performance) { | |
65c19bbd | 673 | mutex_unlock(&performance_mutex); |
d550d98d | 674 | return -EBUSY; |
1da177e4 LT |
675 | } |
676 | ||
a913f507 AM |
677 | WARN_ON(!performance); |
678 | ||
1da177e4 LT |
679 | pr->performance = performance; |
680 | ||
681 | if (acpi_processor_get_performance_info(pr)) { | |
682 | pr->performance = NULL; | |
65c19bbd | 683 | mutex_unlock(&performance_mutex); |
d550d98d | 684 | return -EIO; |
1da177e4 LT |
685 | } |
686 | ||
65c19bbd | 687 | mutex_unlock(&performance_mutex); |
d550d98d | 688 | return 0; |
1da177e4 | 689 | } |
1da177e4 | 690 | |
4be44fcd | 691 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
692 | |
693 | void | |
4be44fcd LB |
694 | acpi_processor_unregister_performance(struct acpi_processor_performance |
695 | *performance, unsigned int cpu) | |
1da177e4 LT |
696 | { |
697 | struct acpi_processor *pr; | |
698 | ||
65c19bbd | 699 | mutex_lock(&performance_mutex); |
1da177e4 | 700 | |
706546d0 | 701 | pr = per_cpu(processors, cpu); |
1da177e4 | 702 | if (!pr) { |
65c19bbd | 703 | mutex_unlock(&performance_mutex); |
d550d98d | 704 | return; |
1da177e4 LT |
705 | } |
706 | ||
a913f507 AM |
707 | if (pr->performance) |
708 | kfree(pr->performance->states); | |
1da177e4 LT |
709 | pr->performance = NULL; |
710 | ||
65c19bbd | 711 | mutex_unlock(&performance_mutex); |
1da177e4 | 712 | |
d550d98d | 713 | return; |
1da177e4 | 714 | } |
4be44fcd | 715 | |
1da177e4 | 716 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |