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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 | * | |
1da177e4 LT |
23 | */ |
24 | ||
1da177e4 LT |
25 | #include <linux/kernel.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/cpufreq.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
8b48463f LZ |
30 | #include <linux/acpi.h> |
31 | #include <acpi/processor.h> | |
16be87ea | 32 | #ifdef CONFIG_X86 |
910dfae2 | 33 | #include <asm/cpufeature.h> |
16be87ea | 34 | #endif |
1da177e4 | 35 | |
a192a958 LB |
36 | #define PREFIX "ACPI: " |
37 | ||
1da177e4 | 38 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 LT |
39 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
40 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
f52fd66d | 41 | ACPI_MODULE_NAME("processor_perflib"); |
1da177e4 | 42 | |
65c19bbd | 43 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 LT |
44 | |
45 | /* | |
46 | * _PPC support is implemented as a CPUfreq policy notifier: | |
47 | * This means each time a CPUfreq driver registered also with | |
48 | * the ACPI core is asked to change the speed policy, the maximum | |
49 | * value is adjusted so that it is within the platform limit. | |
50 | * | |
51 | * Also, when a new platform limit value is detected, the CPUfreq | |
52 | * policy is adjusted accordingly. | |
53 | */ | |
54 | ||
a1531acd TR |
55 | /* ignore_ppc: |
56 | * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet | |
57 | * ignore _PPC | |
58 | * 0 -> cpufreq low level drivers initialized -> consider _PPC values | |
59 | * 1 -> ignore _PPC totally -> forced by user through boot param | |
60 | */ | |
9f497bcc | 61 | static int ignore_ppc = -1; |
613e5f33 | 62 | module_param(ignore_ppc, int, 0644); |
623b78c3 TR |
63 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
64 | "limited by BIOS, this should help"); | |
65 | ||
1da177e4 LT |
66 | #define PPC_REGISTERED 1 |
67 | #define PPC_IN_USE 2 | |
68 | ||
a1531acd | 69 | static int acpi_processor_ppc_status; |
1da177e4 LT |
70 | |
71 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 72 | unsigned long event, void *data) |
1da177e4 LT |
73 | { |
74 | struct cpufreq_policy *policy = data; | |
75 | struct acpi_processor *pr; | |
76 | unsigned int ppc = 0; | |
77 | ||
a1531acd TR |
78 | if (event == CPUFREQ_START && ignore_ppc <= 0) { |
79 | ignore_ppc = 0; | |
80 | return 0; | |
81 | } | |
82 | ||
623b78c3 TR |
83 | if (ignore_ppc) |
84 | return 0; | |
85 | ||
6bfb7c74 | 86 | if (event != CPUFREQ_ADJUST) |
9b67c5d4 TR |
87 | return 0; |
88 | ||
89 | mutex_lock(&performance_mutex); | |
1da177e4 | 90 | |
706546d0 | 91 | pr = per_cpu(processors, policy->cpu); |
1da177e4 LT |
92 | if (!pr || !pr->performance) |
93 | goto out; | |
94 | ||
4be44fcd | 95 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 96 | |
0916bd3e | 97 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
98 | goto out; |
99 | ||
100 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
101 | pr->performance->states[ppc]. |
102 | core_frequency * 1000); | |
1da177e4 | 103 | |
4be44fcd | 104 | out: |
65c19bbd | 105 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
106 | |
107 | return 0; | |
108 | } | |
109 | ||
1da177e4 LT |
110 | static struct notifier_block acpi_ppc_notifier_block = { |
111 | .notifier_call = acpi_processor_ppc_notifier, | |
112 | }; | |
113 | ||
4be44fcd | 114 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 115 | { |
4be44fcd | 116 | acpi_status status = 0; |
27663c58 | 117 | unsigned long long ppc = 0; |
1da177e4 | 118 | |
1da177e4 LT |
119 | |
120 | if (!pr) | |
d550d98d | 121 | return -EINVAL; |
1da177e4 LT |
122 | |
123 | /* | |
124 | * _PPC indicates the maximum state currently supported by the platform | |
125 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
126 | */ | |
127 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
128 | ||
129 | if (status != AE_NOT_FOUND) | |
130 | acpi_processor_ppc_status |= PPC_IN_USE; | |
131 | ||
4be44fcd | 132 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 133 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 134 | return -ENODEV; |
1da177e4 LT |
135 | } |
136 | ||
2d06d8c4 | 137 | pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
919158d1 TR |
138 | (int)ppc, ppc ? "" : "not"); |
139 | ||
4be44fcd | 140 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 141 | |
d550d98d | 142 | return 0; |
1da177e4 LT |
143 | } |
144 | ||
d81c45e1 ZY |
145 | #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
146 | /* | |
147 | * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status | |
148 | * @handle: ACPI processor handle | |
149 | * @status: the status code of _PPC evaluation | |
150 | * 0: success. OSPM is now using the performance state specificed. | |
151 | * 1: failure. OSPM has not changed the number of P-states in use | |
152 | */ | |
153 | static void acpi_processor_ppc_ost(acpi_handle handle, int status) | |
154 | { | |
4a6172a4 JL |
155 | if (acpi_has_method(handle, "_OST")) |
156 | acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE, | |
157 | status, NULL); | |
d81c45e1 ZY |
158 | } |
159 | ||
160 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) | |
1da177e4 | 161 | { |
623b78c3 TR |
162 | int ret; |
163 | ||
d81c45e1 ZY |
164 | if (ignore_ppc) { |
165 | /* | |
166 | * Only when it is notification event, the _OST object | |
167 | * will be evaluated. Otherwise it is skipped. | |
168 | */ | |
169 | if (event_flag) | |
170 | acpi_processor_ppc_ost(pr->handle, 1); | |
623b78c3 | 171 | return 0; |
d81c45e1 | 172 | } |
623b78c3 TR |
173 | |
174 | ret = acpi_processor_get_platform_limit(pr); | |
d81c45e1 ZY |
175 | /* |
176 | * Only when it is notification event, the _OST object | |
177 | * will be evaluated. Otherwise it is skipped. | |
178 | */ | |
179 | if (event_flag) { | |
180 | if (ret < 0) | |
181 | acpi_processor_ppc_ost(pr->handle, 1); | |
182 | else | |
183 | acpi_processor_ppc_ost(pr->handle, 0); | |
184 | } | |
1da177e4 LT |
185 | if (ret < 0) |
186 | return (ret); | |
187 | else | |
188 | return cpufreq_update_policy(pr->id); | |
189 | } | |
190 | ||
e2f74f35 TR |
191 | int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) |
192 | { | |
193 | struct acpi_processor *pr; | |
194 | ||
195 | pr = per_cpu(processors, cpu); | |
196 | if (!pr || !pr->performance || !pr->performance->state_count) | |
197 | return -ENODEV; | |
198 | *limit = pr->performance->states[pr->performance_platform_limit]. | |
199 | core_frequency * 1000; | |
200 | return 0; | |
201 | } | |
202 | EXPORT_SYMBOL(acpi_processor_get_bios_limit); | |
203 | ||
4be44fcd LB |
204 | void acpi_processor_ppc_init(void) |
205 | { | |
206 | if (!cpufreq_register_notifier | |
207 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
208 | acpi_processor_ppc_status |= PPC_REGISTERED; |
209 | else | |
4be44fcd LB |
210 | printk(KERN_DEBUG |
211 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
212 | } |
213 | ||
4be44fcd LB |
214 | void acpi_processor_ppc_exit(void) |
215 | { | |
1da177e4 | 216 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
217 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
218 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
219 | |
220 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
221 | } | |
222 | ||
4be44fcd | 223 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 224 | { |
4be44fcd LB |
225 | int result = 0; |
226 | acpi_status status = 0; | |
227 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
228 | union acpi_object *pct = NULL; | |
229 | union acpi_object obj = { 0 }; | |
1da177e4 | 230 | |
1da177e4 LT |
231 | |
232 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 233 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 234 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 235 | return -ENODEV; |
1da177e4 LT |
236 | } |
237 | ||
4be44fcd | 238 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 239 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 240 | || (pct->package.count != 2)) { |
6468463a | 241 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
242 | result = -EFAULT; |
243 | goto end; | |
244 | } | |
245 | ||
246 | /* | |
247 | * control_register | |
248 | */ | |
249 | ||
250 | obj = pct->package.elements[0]; | |
251 | ||
252 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
253 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
254 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 255 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
256 | result = -EFAULT; |
257 | goto end; | |
258 | } | |
4be44fcd LB |
259 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
260 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
261 | |
262 | /* | |
263 | * status_register | |
264 | */ | |
265 | ||
266 | obj = pct->package.elements[1]; | |
267 | ||
268 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
269 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
270 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 271 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
272 | result = -EFAULT; |
273 | goto end; | |
274 | } | |
275 | ||
4be44fcd LB |
276 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
277 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 278 | |
4be44fcd | 279 | end: |
02438d87 | 280 | kfree(buffer.pointer); |
1da177e4 | 281 | |
d550d98d | 282 | return result; |
1da177e4 LT |
283 | } |
284 | ||
f594065f MG |
285 | #ifdef CONFIG_X86 |
286 | /* | |
287 | * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding | |
288 | * in their ACPI data. Calculate the real values and fix up the _PSS data. | |
289 | */ | |
290 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) | |
291 | { | |
292 | u32 hi, lo, fid, did; | |
293 | int index = px->control & 0x00000007; | |
294 | ||
295 | if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) | |
296 | return; | |
297 | ||
298 | if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) | |
299 | || boot_cpu_data.x86 == 0x11) { | |
300 | rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); | |
9855d8ce SB |
301 | /* |
302 | * MSR C001_0064+: | |
303 | * Bit 63: PstateEn. Read-write. If set, the P-state is valid. | |
304 | */ | |
305 | if (!(hi & BIT(31))) | |
306 | return; | |
307 | ||
f594065f MG |
308 | fid = lo & 0x3f; |
309 | did = (lo >> 6) & 7; | |
310 | if (boot_cpu_data.x86 == 0x10) | |
311 | px->core_frequency = (100 * (fid + 0x10)) >> did; | |
312 | else | |
313 | px->core_frequency = (100 * (fid + 8)) >> did; | |
314 | } | |
315 | } | |
316 | #else | |
317 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; | |
318 | #endif | |
319 | ||
4be44fcd | 320 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 321 | { |
4be44fcd LB |
322 | int result = 0; |
323 | acpi_status status = AE_OK; | |
324 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
325 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
326 | struct acpi_buffer state = { 0, NULL }; | |
327 | union acpi_object *pss = NULL; | |
328 | int i; | |
d8e725f3 | 329 | int last_invalid = -1; |
1da177e4 | 330 | |
1da177e4 LT |
331 | |
332 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 333 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 334 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 335 | return -ENODEV; |
1da177e4 LT |
336 | } |
337 | ||
50dd0969 | 338 | pss = buffer.pointer; |
1da177e4 | 339 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 340 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
341 | result = -EFAULT; |
342 | goto end; | |
343 | } | |
344 | ||
345 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 346 | pss->package.count)); |
1da177e4 LT |
347 | |
348 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
349 | pr->performance->states = |
350 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
351 | GFP_KERNEL); | |
1da177e4 LT |
352 | if (!pr->performance->states) { |
353 | result = -ENOMEM; | |
354 | goto end; | |
355 | } | |
356 | ||
357 | for (i = 0; i < pr->performance->state_count; i++) { | |
358 | ||
359 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
360 | ||
361 | state.length = sizeof(struct acpi_processor_px); | |
362 | state.pointer = px; | |
363 | ||
364 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
365 | ||
366 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 367 | &format, &state); |
1da177e4 | 368 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 369 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
370 | result = -EFAULT; |
371 | kfree(pr->performance->states); | |
372 | goto end; | |
373 | } | |
374 | ||
f594065f MG |
375 | amd_fixup_frequency(px, i); |
376 | ||
1da177e4 | 377 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
378 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
379 | i, | |
380 | (u32) px->core_frequency, | |
381 | (u32) px->power, | |
382 | (u32) px->transition_latency, | |
383 | (u32) px->bus_master_latency, | |
384 | (u32) px->control, (u32) px->status)); | |
1da177e4 | 385 | |
34d531e6 LB |
386 | /* |
387 | * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq | |
388 | */ | |
389 | if (!px->core_frequency || | |
390 | ((u32)(px->core_frequency * 1000) != | |
391 | (px->core_frequency * 1000))) { | |
392 | printk(KERN_ERR FW_BUG PREFIX | |
d8e725f3 MAC |
393 | "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", |
394 | pr->id, px->core_frequency); | |
395 | if (last_invalid == -1) | |
396 | last_invalid = i; | |
397 | } else { | |
398 | if (last_invalid != -1) { | |
399 | /* | |
400 | * Copy this valid entry over last_invalid entry | |
401 | */ | |
402 | memcpy(&(pr->performance->states[last_invalid]), | |
403 | px, sizeof(struct acpi_processor_px)); | |
404 | ++last_invalid; | |
405 | } | |
1da177e4 LT |
406 | } |
407 | } | |
408 | ||
d8e725f3 MAC |
409 | if (last_invalid == 0) { |
410 | printk(KERN_ERR FW_BUG PREFIX | |
411 | "No valid BIOS _PSS frequency found for processor %d\n", pr->id); | |
412 | result = -EFAULT; | |
413 | kfree(pr->performance->states); | |
414 | pr->performance->states = NULL; | |
415 | } | |
416 | ||
417 | if (last_invalid > 0) | |
418 | pr->performance->state_count = last_invalid; | |
419 | ||
4be44fcd | 420 | end: |
02438d87 | 421 | kfree(buffer.pointer); |
1da177e4 | 422 | |
d550d98d | 423 | return result; |
1da177e4 LT |
424 | } |
425 | ||
c705c78c | 426 | int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 427 | { |
4be44fcd | 428 | int result = 0; |
1da177e4 | 429 | |
1da177e4 | 430 | if (!pr || !pr->performance || !pr->handle) |
d550d98d | 431 | return -EINVAL; |
1da177e4 | 432 | |
952c63e9 | 433 | if (!acpi_has_method(pr->handle, "_PCT")) { |
1da177e4 | 434 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd | 435 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 436 | return -ENODEV; |
1da177e4 LT |
437 | } |
438 | ||
439 | result = acpi_processor_get_performance_control(pr); | |
440 | if (result) | |
910dfae2 | 441 | goto update_bios; |
1da177e4 LT |
442 | |
443 | result = acpi_processor_get_performance_states(pr); | |
444 | if (result) | |
910dfae2 | 445 | goto update_bios; |
1da177e4 | 446 | |
455c0d71 DW |
447 | /* We need to call _PPC once when cpufreq starts */ |
448 | if (ignore_ppc != 1) | |
449 | result = acpi_processor_get_platform_limit(pr); | |
450 | ||
451 | return result; | |
910dfae2 TR |
452 | |
453 | /* | |
454 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that | |
455 | * the BIOS is older than the CPU and does not know its frequencies | |
456 | */ | |
457 | update_bios: | |
16be87ea | 458 | #ifdef CONFIG_X86 |
952c63e9 | 459 | if (acpi_has_method(pr->handle, "_PPC")) { |
910dfae2 TR |
460 | if(boot_cpu_has(X86_FEATURE_EST)) |
461 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " | |
462 | "frequency support\n"); | |
463 | } | |
16be87ea | 464 | #endif |
910dfae2 | 465 | return result; |
1da177e4 | 466 | } |
c705c78c | 467 | EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); |
4be44fcd LB |
468 | int acpi_processor_notify_smm(struct module *calling_module) |
469 | { | |
470 | acpi_status status; | |
471 | static int is_done = 0; | |
1da177e4 | 472 | |
1da177e4 LT |
473 | |
474 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 475 | return -EBUSY; |
1da177e4 LT |
476 | |
477 | if (!try_module_get(calling_module)) | |
d550d98d | 478 | return -EINVAL; |
1da177e4 | 479 | |
58f87ed0 LDM |
480 | /* is_done is set to negative if an error occurred, |
481 | * and to postitive if _no_ error occurred, but SMM | |
1da177e4 LT |
482 | * was already notified. This avoids double notification |
483 | * which might lead to unexpected results... | |
484 | */ | |
485 | if (is_done > 0) { | |
486 | module_put(calling_module); | |
d550d98d | 487 | return 0; |
4be44fcd | 488 | } else if (is_done < 0) { |
1da177e4 | 489 | module_put(calling_module); |
d550d98d | 490 | return is_done; |
1da177e4 LT |
491 | } |
492 | ||
493 | is_done = -EIO; | |
494 | ||
ad71860a | 495 | /* Can't write pstate_control to smi_command if either value is zero */ |
cee324b1 | 496 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
ad71860a | 497 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 498 | module_put(calling_module); |
d550d98d | 499 | return 0; |
1da177e4 LT |
500 | } |
501 | ||
4be44fcd | 502 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a | 503 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
cee324b1 | 504 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
1da177e4 | 505 | |
cee324b1 AS |
506 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
507 | (u32) acpi_gbl_FADT.pstate_control, 8); | |
4be44fcd | 508 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 509 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a | 510 | "Failed to write pstate_control [0x%x] to " |
cee324b1 AS |
511 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
512 | acpi_gbl_FADT.smi_command)); | |
1da177e4 | 513 | module_put(calling_module); |
d550d98d | 514 | return status; |
1da177e4 LT |
515 | } |
516 | ||
517 | /* Success. If there's no _PPC, we need to fear nothing, so | |
518 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
519 | is_done = 1; | |
520 | ||
521 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
522 | module_put(calling_module); | |
523 | ||
d550d98d | 524 | return 0; |
1da177e4 | 525 | } |
1da177e4 | 526 | |
4be44fcd | 527 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 | 528 | |
3b2d9942 VP |
529 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
530 | { | |
531 | int result = 0; | |
532 | acpi_status status = AE_OK; | |
533 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
534 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
535 | struct acpi_buffer state = {0, NULL}; | |
536 | union acpi_object *psd = NULL; | |
537 | struct acpi_psd_package *pdomain; | |
538 | ||
3b2d9942 VP |
539 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
540 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 541 | return -ENODEV; |
3b2d9942 VP |
542 | } |
543 | ||
50dd0969 | 544 | psd = buffer.pointer; |
3b2d9942 | 545 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
55ac9a01 | 546 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
547 | result = -EFAULT; |
548 | goto end; | |
549 | } | |
550 | ||
551 | if (psd->package.count != 1) { | |
55ac9a01 | 552 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
553 | result = -EFAULT; |
554 | goto end; | |
555 | } | |
556 | ||
557 | pdomain = &(pr->performance->domain_info); | |
558 | ||
559 | state.length = sizeof(struct acpi_psd_package); | |
560 | state.pointer = pdomain; | |
561 | ||
562 | status = acpi_extract_package(&(psd->package.elements[0]), | |
563 | &format, &state); | |
564 | if (ACPI_FAILURE(status)) { | |
55ac9a01 | 565 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
566 | result = -EFAULT; |
567 | goto end; | |
568 | } | |
569 | ||
570 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
55ac9a01 | 571 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
3b2d9942 VP |
572 | result = -EFAULT; |
573 | goto end; | |
574 | } | |
575 | ||
576 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
55ac9a01 | 577 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
3b2d9942 VP |
578 | result = -EFAULT; |
579 | goto end; | |
580 | } | |
581 | ||
e1eb4779 SG |
582 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
583 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
584 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
585 | printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); | |
586 | result = -EFAULT; | |
587 | goto end; | |
588 | } | |
3b2d9942 | 589 | end: |
02438d87 | 590 | kfree(buffer.pointer); |
9011bff4 | 591 | return result; |
3b2d9942 VP |
592 | } |
593 | ||
594 | int acpi_processor_preregister_performance( | |
a29d8b8e | 595 | struct acpi_processor_performance __percpu *performance) |
3b2d9942 | 596 | { |
09d5ca80 | 597 | int count_target; |
3b2d9942 VP |
598 | int retval = 0; |
599 | unsigned int i, j; | |
2fdf66b4 | 600 | cpumask_var_t covered_cpus; |
3b2d9942 VP |
601 | struct acpi_processor *pr; |
602 | struct acpi_psd_package *pdomain; | |
603 | struct acpi_processor *match_pr; | |
604 | struct acpi_psd_package *match_pdomain; | |
605 | ||
79f55997 | 606 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
607 | return -ENOMEM; |
608 | ||
785fcccd | 609 | mutex_lock(&performance_mutex); |
3b2d9942 | 610 | |
e1eb4779 SG |
611 | /* |
612 | * Check if another driver has already registered, and abort before | |
613 | * changing pr->performance if it has. Check input data as well. | |
614 | */ | |
193de0c7 | 615 | for_each_possible_cpu(i) { |
706546d0 | 616 | pr = per_cpu(processors, i); |
3b2d9942 VP |
617 | if (!pr) { |
618 | /* Look only at processors in ACPI namespace */ | |
619 | continue; | |
620 | } | |
621 | ||
622 | if (pr->performance) { | |
623 | retval = -EBUSY; | |
e1eb4779 | 624 | goto err_out; |
3b2d9942 VP |
625 | } |
626 | ||
b36128c8 | 627 | if (!performance || !per_cpu_ptr(performance, i)) { |
3b2d9942 | 628 | retval = -EINVAL; |
e1eb4779 | 629 | goto err_out; |
3b2d9942 | 630 | } |
e1eb4779 SG |
631 | } |
632 | ||
633 | /* Call _PSD for all CPUs */ | |
634 | for_each_possible_cpu(i) { | |
635 | pr = per_cpu(processors, i); | |
636 | if (!pr) | |
637 | continue; | |
3b2d9942 | 638 | |
b36128c8 | 639 | pr->performance = per_cpu_ptr(performance, i); |
2fdf66b4 | 640 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
3b2d9942 VP |
641 | if (acpi_processor_get_psd(pr)) { |
642 | retval = -EINVAL; | |
643 | continue; | |
644 | } | |
645 | } | |
646 | if (retval) | |
647 | goto err_ret; | |
648 | ||
649 | /* | |
650 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
651 | * domain info. | |
652 | */ | |
193de0c7 | 653 | for_each_possible_cpu(i) { |
706546d0 | 654 | pr = per_cpu(processors, i); |
3b2d9942 VP |
655 | if (!pr) |
656 | continue; | |
657 | ||
2fdf66b4 | 658 | if (cpumask_test_cpu(i, covered_cpus)) |
3b2d9942 VP |
659 | continue; |
660 | ||
661 | pdomain = &(pr->performance->domain_info); | |
2fdf66b4 RR |
662 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
663 | cpumask_set_cpu(i, covered_cpus); | |
3b2d9942 VP |
664 | if (pdomain->num_processors <= 1) |
665 | continue; | |
666 | ||
667 | /* Validate the Domain info */ | |
668 | count_target = pdomain->num_processors; | |
46f18e3a | 669 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 670 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
671 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
672 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
673 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 674 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 675 | |
193de0c7 | 676 | for_each_possible_cpu(j) { |
3b2d9942 VP |
677 | if (i == j) |
678 | continue; | |
679 | ||
706546d0 | 680 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
681 | if (!match_pr) |
682 | continue; | |
683 | ||
684 | match_pdomain = &(match_pr->performance->domain_info); | |
685 | if (match_pdomain->domain != pdomain->domain) | |
686 | continue; | |
687 | ||
688 | /* Here i and j are in the same domain */ | |
689 | ||
690 | if (match_pdomain->num_processors != count_target) { | |
691 | retval = -EINVAL; | |
692 | goto err_ret; | |
693 | } | |
694 | ||
695 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
696 | retval = -EINVAL; | |
697 | goto err_ret; | |
698 | } | |
699 | ||
2fdf66b4 RR |
700 | cpumask_set_cpu(j, covered_cpus); |
701 | cpumask_set_cpu(j, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
702 | } |
703 | ||
193de0c7 | 704 | for_each_possible_cpu(j) { |
3b2d9942 VP |
705 | if (i == j) |
706 | continue; | |
707 | ||
706546d0 | 708 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
709 | if (!match_pr) |
710 | continue; | |
711 | ||
712 | match_pdomain = &(match_pr->performance->domain_info); | |
713 | if (match_pdomain->domain != pdomain->domain) | |
714 | continue; | |
715 | ||
716 | match_pr->performance->shared_type = | |
717 | pr->performance->shared_type; | |
2fdf66b4 RR |
718 | cpumask_copy(match_pr->performance->shared_cpu_map, |
719 | pr->performance->shared_cpu_map); | |
3b2d9942 VP |
720 | } |
721 | } | |
722 | ||
723 | err_ret: | |
193de0c7 | 724 | for_each_possible_cpu(i) { |
706546d0 | 725 | pr = per_cpu(processors, i); |
3b2d9942 VP |
726 | if (!pr || !pr->performance) |
727 | continue; | |
728 | ||
729 | /* Assume no coordination on any error parsing domain info */ | |
730 | if (retval) { | |
2fdf66b4 RR |
731 | cpumask_clear(pr->performance->shared_cpu_map); |
732 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
733 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
734 | } | |
735 | pr->performance = NULL; /* Will be set for real in register */ | |
736 | } | |
737 | ||
e1eb4779 | 738 | err_out: |
785fcccd | 739 | mutex_unlock(&performance_mutex); |
2fdf66b4 | 740 | free_cpumask_var(covered_cpus); |
9011bff4 | 741 | return retval; |
3b2d9942 VP |
742 | } |
743 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
744 | ||
1da177e4 | 745 | int |
4be44fcd LB |
746 | acpi_processor_register_performance(struct acpi_processor_performance |
747 | *performance, unsigned int cpu) | |
1da177e4 LT |
748 | { |
749 | struct acpi_processor *pr; | |
750 | ||
1da177e4 | 751 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
d550d98d | 752 | return -EINVAL; |
1da177e4 | 753 | |
65c19bbd | 754 | mutex_lock(&performance_mutex); |
1da177e4 | 755 | |
706546d0 | 756 | pr = per_cpu(processors, cpu); |
1da177e4 | 757 | if (!pr) { |
65c19bbd | 758 | mutex_unlock(&performance_mutex); |
d550d98d | 759 | return -ENODEV; |
1da177e4 LT |
760 | } |
761 | ||
762 | if (pr->performance) { | |
65c19bbd | 763 | mutex_unlock(&performance_mutex); |
d550d98d | 764 | return -EBUSY; |
1da177e4 LT |
765 | } |
766 | ||
a913f507 AM |
767 | WARN_ON(!performance); |
768 | ||
1da177e4 LT |
769 | pr->performance = performance; |
770 | ||
771 | if (acpi_processor_get_performance_info(pr)) { | |
772 | pr->performance = NULL; | |
65c19bbd | 773 | mutex_unlock(&performance_mutex); |
d550d98d | 774 | return -EIO; |
1da177e4 LT |
775 | } |
776 | ||
65c19bbd | 777 | mutex_unlock(&performance_mutex); |
d550d98d | 778 | return 0; |
1da177e4 | 779 | } |
1da177e4 | 780 | |
4be44fcd | 781 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 | 782 | |
b2f8dc4c | 783 | void acpi_processor_unregister_performance(unsigned int cpu) |
1da177e4 LT |
784 | { |
785 | struct acpi_processor *pr; | |
786 | ||
65c19bbd | 787 | mutex_lock(&performance_mutex); |
1da177e4 | 788 | |
706546d0 | 789 | pr = per_cpu(processors, cpu); |
1da177e4 | 790 | if (!pr) { |
65c19bbd | 791 | mutex_unlock(&performance_mutex); |
d550d98d | 792 | return; |
1da177e4 LT |
793 | } |
794 | ||
a913f507 AM |
795 | if (pr->performance) |
796 | kfree(pr->performance->states); | |
1da177e4 LT |
797 | pr->performance = NULL; |
798 | ||
65c19bbd | 799 | mutex_unlock(&performance_mutex); |
1da177e4 | 800 | |
d550d98d | 801 | return; |
1da177e4 | 802 | } |
4be44fcd | 803 | |
1da177e4 | 804 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |