Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * processor_throttling.c - Throttling submodule of the ACPI processor driver | |
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 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or (at | |
15 | * your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | * General Public License for more details. | |
21 | * | |
1da177e4 LT |
22 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/module.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
1da177e4 | 28 | #include <linux/init.h> |
357dc4c3 | 29 | #include <linux/sched.h> |
1da177e4 | 30 | #include <linux/cpufreq.h> |
8b48463f LZ |
31 | #include <linux/acpi.h> |
32 | #include <acpi/processor.h> | |
1da177e4 | 33 | #include <asm/io.h> |
7c0f6ba6 | 34 | #include <linux/uaccess.h> |
1da177e4 | 35 | |
a192a958 LB |
36 | #define PREFIX "ACPI: " |
37 | ||
1da177e4 | 38 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 | 39 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
f52fd66d | 40 | ACPI_MODULE_NAME("processor_throttling"); |
1da177e4 | 41 | |
56c213fa ZR |
42 | /* ignore_tpc: |
43 | * 0 -> acpi processor driver doesn't ignore _TPC values | |
44 | * 1 -> acpi processor driver ignores _TPC values | |
45 | */ | |
46 | static int ignore_tpc; | |
47 | module_param(ignore_tpc, int, 0644); | |
48 | MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support"); | |
49 | ||
e4aa5cb2 ZY |
50 | struct throttling_tstate { |
51 | unsigned int cpu; /* cpu nr */ | |
52 | int target_state; /* target T-state */ | |
53 | }; | |
54 | ||
f3ca4164 LT |
55 | struct acpi_processor_throttling_arg { |
56 | struct acpi_processor *pr; | |
57 | int target_state; | |
58 | bool force; | |
59 | }; | |
60 | ||
e4aa5cb2 ZY |
61 | #define THROTTLING_PRECHANGE (1) |
62 | #define THROTTLING_POSTCHANGE (2) | |
63 | ||
ff55a9ce | 64 | static int acpi_processor_get_throttling(struct acpi_processor *pr); |
8153f9ac TG |
65 | static int __acpi_processor_set_throttling(struct acpi_processor *pr, |
66 | int state, bool force, bool direct); | |
01854e69 | 67 | |
1180509f ZY |
68 | static int acpi_processor_update_tsd_coord(void) |
69 | { | |
70 | int count, count_target; | |
71 | int retval = 0; | |
72 | unsigned int i, j; | |
2fdf66b4 | 73 | cpumask_var_t covered_cpus; |
1180509f ZY |
74 | struct acpi_processor *pr, *match_pr; |
75 | struct acpi_tsd_package *pdomain, *match_pdomain; | |
76 | struct acpi_processor_throttling *pthrottling, *match_pthrottling; | |
77 | ||
79f55997 | 78 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
79 | return -ENOMEM; |
80 | ||
1180509f ZY |
81 | /* |
82 | * Now that we have _TSD data from all CPUs, lets setup T-state | |
33a2a529 | 83 | * coordination between all CPUs. |
1180509f ZY |
84 | */ |
85 | for_each_possible_cpu(i) { | |
706546d0 | 86 | pr = per_cpu(processors, i); |
1180509f ZY |
87 | if (!pr) |
88 | continue; | |
89 | ||
90 | /* Basic validity check for domain info */ | |
91 | pthrottling = &(pr->throttling); | |
92 | ||
93 | /* | |
94 | * If tsd package for one cpu is invalid, the coordination | |
95 | * among all CPUs is thought as invalid. | |
96 | * Maybe it is ugly. | |
97 | */ | |
98 | if (!pthrottling->tsd_valid_flag) { | |
99 | retval = -EINVAL; | |
100 | break; | |
101 | } | |
102 | } | |
103 | if (retval) | |
104 | goto err_ret; | |
105 | ||
1180509f | 106 | for_each_possible_cpu(i) { |
706546d0 | 107 | pr = per_cpu(processors, i); |
1180509f ZY |
108 | if (!pr) |
109 | continue; | |
110 | ||
2fdf66b4 | 111 | if (cpumask_test_cpu(i, covered_cpus)) |
1180509f ZY |
112 | continue; |
113 | pthrottling = &pr->throttling; | |
114 | ||
115 | pdomain = &(pthrottling->domain_info); | |
2fdf66b4 RR |
116 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); |
117 | cpumask_set_cpu(i, covered_cpus); | |
1180509f ZY |
118 | /* |
119 | * If the number of processor in the TSD domain is 1, it is | |
120 | * unnecessary to parse the coordination for this CPU. | |
121 | */ | |
122 | if (pdomain->num_processors <= 1) | |
123 | continue; | |
124 | ||
125 | /* Validate the Domain info */ | |
126 | count_target = pdomain->num_processors; | |
127 | count = 1; | |
128 | ||
129 | for_each_possible_cpu(j) { | |
130 | if (i == j) | |
131 | continue; | |
132 | ||
706546d0 | 133 | match_pr = per_cpu(processors, j); |
1180509f ZY |
134 | if (!match_pr) |
135 | continue; | |
136 | ||
137 | match_pthrottling = &(match_pr->throttling); | |
138 | match_pdomain = &(match_pthrottling->domain_info); | |
139 | if (match_pdomain->domain != pdomain->domain) | |
140 | continue; | |
141 | ||
142 | /* Here i and j are in the same domain. | |
143 | * If two TSD packages have the same domain, they | |
144 | * should have the same num_porcessors and | |
145 | * coordination type. Otherwise it will be regarded | |
146 | * as illegal. | |
147 | */ | |
148 | if (match_pdomain->num_processors != count_target) { | |
149 | retval = -EINVAL; | |
150 | goto err_ret; | |
151 | } | |
152 | ||
153 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
154 | retval = -EINVAL; | |
155 | goto err_ret; | |
156 | } | |
157 | ||
2fdf66b4 RR |
158 | cpumask_set_cpu(j, covered_cpus); |
159 | cpumask_set_cpu(j, pthrottling->shared_cpu_map); | |
1180509f ZY |
160 | count++; |
161 | } | |
162 | for_each_possible_cpu(j) { | |
163 | if (i == j) | |
164 | continue; | |
165 | ||
706546d0 | 166 | match_pr = per_cpu(processors, j); |
1180509f ZY |
167 | if (!match_pr) |
168 | continue; | |
169 | ||
170 | match_pthrottling = &(match_pr->throttling); | |
171 | match_pdomain = &(match_pthrottling->domain_info); | |
172 | if (match_pdomain->domain != pdomain->domain) | |
173 | continue; | |
174 | ||
175 | /* | |
176 | * If some CPUS have the same domain, they | |
177 | * will have the same shared_cpu_map. | |
178 | */ | |
2fdf66b4 RR |
179 | cpumask_copy(match_pthrottling->shared_cpu_map, |
180 | pthrottling->shared_cpu_map); | |
1180509f ZY |
181 | } |
182 | } | |
183 | ||
184 | err_ret: | |
2fdf66b4 RR |
185 | free_cpumask_var(covered_cpus); |
186 | ||
1180509f | 187 | for_each_possible_cpu(i) { |
706546d0 | 188 | pr = per_cpu(processors, i); |
1180509f ZY |
189 | if (!pr) |
190 | continue; | |
191 | ||
192 | /* | |
193 | * Assume no coordination on any error parsing domain info. | |
194 | * The coordination type will be forced as SW_ALL. | |
195 | */ | |
196 | if (retval) { | |
197 | pthrottling = &(pr->throttling); | |
2fdf66b4 RR |
198 | cpumask_clear(pthrottling->shared_cpu_map); |
199 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); | |
1180509f ZY |
200 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
201 | } | |
202 | } | |
203 | ||
204 | return retval; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Update the T-state coordination after the _TSD | |
209 | * data for all cpus is obtained. | |
210 | */ | |
211 | void acpi_processor_throttling_init(void) | |
212 | { | |
2d5914cc | 213 | if (acpi_processor_update_tsd_coord()) { |
1180509f ZY |
214 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
215 | "Assume no T-state coordination\n")); | |
2d5914cc | 216 | } |
1180509f ZY |
217 | |
218 | return; | |
219 | } | |
220 | ||
e4aa5cb2 ZY |
221 | static int acpi_processor_throttling_notifier(unsigned long event, void *data) |
222 | { | |
223 | struct throttling_tstate *p_tstate = data; | |
224 | struct acpi_processor *pr; | |
225 | unsigned int cpu ; | |
226 | int target_state; | |
227 | struct acpi_processor_limit *p_limit; | |
228 | struct acpi_processor_throttling *p_throttling; | |
229 | ||
230 | cpu = p_tstate->cpu; | |
706546d0 | 231 | pr = per_cpu(processors, cpu); |
e4aa5cb2 ZY |
232 | if (!pr) { |
233 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n")); | |
234 | return 0; | |
235 | } | |
236 | if (!pr->flags.throttling) { | |
237 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is " | |
238 | "unsupported on CPU %d\n", cpu)); | |
239 | return 0; | |
240 | } | |
241 | target_state = p_tstate->target_state; | |
242 | p_throttling = &(pr->throttling); | |
243 | switch (event) { | |
244 | case THROTTLING_PRECHANGE: | |
245 | /* | |
246 | * Prechange event is used to choose one proper t-state, | |
247 | * which meets the limits of thermal, user and _TPC. | |
248 | */ | |
249 | p_limit = &pr->limit; | |
250 | if (p_limit->thermal.tx > target_state) | |
251 | target_state = p_limit->thermal.tx; | |
252 | if (p_limit->user.tx > target_state) | |
253 | target_state = p_limit->user.tx; | |
254 | if (pr->throttling_platform_limit > target_state) | |
255 | target_state = pr->throttling_platform_limit; | |
256 | if (target_state >= p_throttling->state_count) { | |
257 | printk(KERN_WARNING | |
258 | "Exceed the limit of T-state \n"); | |
259 | target_state = p_throttling->state_count - 1; | |
260 | } | |
261 | p_tstate->target_state = target_state; | |
262 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:" | |
263 | "target T-state of CPU %d is T%d\n", | |
264 | cpu, target_state)); | |
265 | break; | |
266 | case THROTTLING_POSTCHANGE: | |
267 | /* | |
268 | * Postchange event is only used to update the | |
269 | * T-state flag of acpi_processor_throttling. | |
270 | */ | |
271 | p_throttling->state = target_state; | |
272 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:" | |
273 | "CPU %d is switched to T%d\n", | |
274 | cpu, target_state)); | |
275 | break; | |
276 | default: | |
277 | printk(KERN_WARNING | |
278 | "Unsupported Throttling notifier event\n"); | |
279 | break; | |
280 | } | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
c30c620e LB |
285 | /* |
286 | * _TPC - Throttling Present Capabilities | |
287 | */ | |
01854e69 LY |
288 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
289 | { | |
290 | acpi_status status = 0; | |
27663c58 | 291 | unsigned long long tpc = 0; |
01854e69 | 292 | |
ff55a9ce | 293 | if (!pr) |
01854e69 | 294 | return -EINVAL; |
56c213fa ZR |
295 | |
296 | if (ignore_tpc) | |
297 | goto end; | |
298 | ||
01854e69 | 299 | status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); |
c30c620e LB |
300 | if (ACPI_FAILURE(status)) { |
301 | if (status != AE_NOT_FOUND) { | |
302 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC")); | |
303 | } | |
01854e69 LY |
304 | return -ENODEV; |
305 | } | |
56c213fa ZR |
306 | |
307 | end: | |
01854e69 LY |
308 | pr->throttling_platform_limit = (int)tpc; |
309 | return 0; | |
310 | } | |
311 | ||
312 | int acpi_processor_tstate_has_changed(struct acpi_processor *pr) | |
313 | { | |
ef54d5ad ZY |
314 | int result = 0; |
315 | int throttling_limit; | |
316 | int current_state; | |
317 | struct acpi_processor_limit *limit; | |
318 | int target_state; | |
319 | ||
56c213fa ZR |
320 | if (ignore_tpc) |
321 | return 0; | |
322 | ||
ef54d5ad ZY |
323 | result = acpi_processor_get_platform_limit(pr); |
324 | if (result) { | |
325 | /* Throttling Limit is unsupported */ | |
326 | return result; | |
327 | } | |
328 | ||
329 | throttling_limit = pr->throttling_platform_limit; | |
330 | if (throttling_limit >= pr->throttling.state_count) { | |
331 | /* Uncorrect Throttling Limit */ | |
332 | return -EINVAL; | |
333 | } | |
334 | ||
335 | current_state = pr->throttling.state; | |
336 | if (current_state > throttling_limit) { | |
337 | /* | |
338 | * The current state can meet the requirement of | |
339 | * _TPC limit. But it is reasonable that OSPM changes | |
340 | * t-states from high to low for better performance. | |
341 | * Of course the limit condition of thermal | |
342 | * and user should be considered. | |
343 | */ | |
344 | limit = &pr->limit; | |
345 | target_state = throttling_limit; | |
346 | if (limit->thermal.tx > target_state) | |
347 | target_state = limit->thermal.tx; | |
348 | if (limit->user.tx > target_state) | |
349 | target_state = limit->user.tx; | |
350 | } else if (current_state == throttling_limit) { | |
351 | /* | |
352 | * Unnecessary to change the throttling state | |
353 | */ | |
354 | return 0; | |
355 | } else { | |
356 | /* | |
357 | * If the current state is lower than the limit of _TPC, it | |
358 | * will be forced to switch to the throttling state defined | |
359 | * by throttling_platfor_limit. | |
360 | * Because the previous state meets with the limit condition | |
361 | * of thermal and user, it is unnecessary to check it again. | |
362 | */ | |
363 | target_state = throttling_limit; | |
364 | } | |
2a908002 | 365 | return acpi_processor_set_throttling(pr, target_state, false); |
01854e69 LY |
366 | } |
367 | ||
5a344a50 ZY |
368 | /* |
369 | * This function is used to reevaluate whether the T-state is valid | |
370 | * after one CPU is onlined/offlined. | |
371 | * It is noted that it won't reevaluate the following properties for | |
372 | * the T-state. | |
373 | * 1. Control method. | |
374 | * 2. the number of supported T-state | |
375 | * 3. TSD domain | |
376 | */ | |
377 | void acpi_processor_reevaluate_tstate(struct acpi_processor *pr, | |
64f3bf2f | 378 | bool is_dead) |
5a344a50 ZY |
379 | { |
380 | int result = 0; | |
381 | ||
64f3bf2f | 382 | if (is_dead) { |
5a344a50 ZY |
383 | /* When one CPU is offline, the T-state throttling |
384 | * will be invalidated. | |
385 | */ | |
386 | pr->flags.throttling = 0; | |
387 | return; | |
388 | } | |
389 | /* the following is to recheck whether the T-state is valid for | |
390 | * the online CPU | |
391 | */ | |
392 | if (!pr->throttling.state_count) { | |
393 | /* If the number of T-state is invalid, it is | |
394 | * invalidated. | |
395 | */ | |
396 | pr->flags.throttling = 0; | |
397 | return; | |
398 | } | |
399 | pr->flags.throttling = 1; | |
400 | ||
401 | /* Disable throttling (if enabled). We'll let subsequent | |
402 | * policy (e.g.thermal) decide to lower performance if it | |
403 | * so chooses, but for now we'll crank up the speed. | |
404 | */ | |
405 | ||
406 | result = acpi_processor_get_throttling(pr); | |
407 | if (result) | |
408 | goto end; | |
409 | ||
410 | if (pr->throttling.state) { | |
411 | result = acpi_processor_set_throttling(pr, 0, false); | |
412 | if (result) | |
413 | goto end; | |
414 | } | |
415 | ||
416 | end: | |
417 | if (result) | |
418 | pr->flags.throttling = 0; | |
419 | } | |
c30c620e LB |
420 | /* |
421 | * _PTC - Processor Throttling Control (and status) register location | |
422 | */ | |
01854e69 LY |
423 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) |
424 | { | |
425 | int result = 0; | |
426 | acpi_status status = 0; | |
427 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
428 | union acpi_object *ptc = NULL; | |
429 | union acpi_object obj = { 0 }; | |
9bcb2721 | 430 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
431 | |
432 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); | |
433 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
434 | if (status != AE_NOT_FOUND) { |
435 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); | |
436 | } | |
01854e69 LY |
437 | return -ENODEV; |
438 | } | |
439 | ||
440 | ptc = (union acpi_object *)buffer.pointer; | |
441 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) | |
442 | || (ptc->package.count != 2)) { | |
443 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); | |
444 | result = -EFAULT; | |
445 | goto end; | |
446 | } | |
447 | ||
448 | /* | |
449 | * control_register | |
450 | */ | |
451 | ||
452 | obj = ptc->package.elements[0]; | |
453 | ||
454 | if ((obj.type != ACPI_TYPE_BUFFER) | |
455 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
456 | || (obj.buffer.pointer == NULL)) { | |
ff55a9ce LB |
457 | printk(KERN_ERR PREFIX |
458 | "Invalid _PTC data (control_register)\n"); | |
01854e69 LY |
459 | result = -EFAULT; |
460 | goto end; | |
461 | } | |
462 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, | |
463 | sizeof(struct acpi_ptc_register)); | |
464 | ||
465 | /* | |
466 | * status_register | |
467 | */ | |
468 | ||
469 | obj = ptc->package.elements[1]; | |
470 | ||
471 | if ((obj.type != ACPI_TYPE_BUFFER) | |
472 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
473 | || (obj.buffer.pointer == NULL)) { | |
474 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); | |
475 | result = -EFAULT; | |
476 | goto end; | |
477 | } | |
478 | ||
479 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, | |
ff55a9ce | 480 | sizeof(struct acpi_ptc_register)); |
01854e69 | 481 | |
9bcb2721 ZY |
482 | throttling = &pr->throttling; |
483 | ||
484 | if ((throttling->control_register.bit_width + | |
485 | throttling->control_register.bit_offset) > 32) { | |
486 | printk(KERN_ERR PREFIX "Invalid _PTC control register\n"); | |
487 | result = -EFAULT; | |
488 | goto end; | |
489 | } | |
490 | ||
491 | if ((throttling->status_register.bit_width + | |
492 | throttling->status_register.bit_offset) > 32) { | |
493 | printk(KERN_ERR PREFIX "Invalid _PTC status register\n"); | |
494 | result = -EFAULT; | |
495 | goto end; | |
496 | } | |
497 | ||
ff55a9ce | 498 | end: |
01854e69 LY |
499 | kfree(buffer.pointer); |
500 | ||
501 | return result; | |
502 | } | |
c30c620e LB |
503 | |
504 | /* | |
505 | * _TSS - Throttling Supported States | |
506 | */ | |
01854e69 LY |
507 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) |
508 | { | |
509 | int result = 0; | |
510 | acpi_status status = AE_OK; | |
511 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
512 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
513 | struct acpi_buffer state = { 0, NULL }; | |
514 | union acpi_object *tss = NULL; | |
515 | int i; | |
516 | ||
517 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); | |
518 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
519 | if (status != AE_NOT_FOUND) { |
520 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); | |
521 | } | |
01854e69 LY |
522 | return -ENODEV; |
523 | } | |
524 | ||
525 | tss = buffer.pointer; | |
526 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { | |
527 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); | |
528 | result = -EFAULT; | |
529 | goto end; | |
530 | } | |
531 | ||
532 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
533 | tss->package.count)); | |
534 | ||
535 | pr->throttling.state_count = tss->package.count; | |
536 | pr->throttling.states_tss = | |
537 | kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count, | |
538 | GFP_KERNEL); | |
539 | if (!pr->throttling.states_tss) { | |
540 | result = -ENOMEM; | |
541 | goto end; | |
542 | } | |
543 | ||
544 | for (i = 0; i < pr->throttling.state_count; i++) { | |
545 | ||
ff55a9ce LB |
546 | struct acpi_processor_tx_tss *tx = |
547 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
548 | states_tss[i]); | |
01854e69 LY |
549 | |
550 | state.length = sizeof(struct acpi_processor_tx_tss); | |
551 | state.pointer = tx; | |
552 | ||
553 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
554 | ||
555 | status = acpi_extract_package(&(tss->package.elements[i]), | |
556 | &format, &state); | |
557 | if (ACPI_FAILURE(status)) { | |
558 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); | |
559 | result = -EFAULT; | |
560 | kfree(pr->throttling.states_tss); | |
561 | goto end; | |
562 | } | |
563 | ||
564 | if (!tx->freqpercentage) { | |
565 | printk(KERN_ERR PREFIX | |
ff55a9ce | 566 | "Invalid _TSS data: freq is zero\n"); |
01854e69 LY |
567 | result = -EFAULT; |
568 | kfree(pr->throttling.states_tss); | |
569 | goto end; | |
570 | } | |
571 | } | |
572 | ||
573 | end: | |
574 | kfree(buffer.pointer); | |
575 | ||
576 | return result; | |
577 | } | |
c30c620e LB |
578 | |
579 | /* | |
580 | * _TSD - T-State Dependencies | |
581 | */ | |
ff55a9ce | 582 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
01854e69 LY |
583 | { |
584 | int result = 0; | |
585 | acpi_status status = AE_OK; | |
ff55a9ce LB |
586 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
587 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
588 | struct acpi_buffer state = { 0, NULL }; | |
589 | union acpi_object *tsd = NULL; | |
01854e69 | 590 | struct acpi_tsd_package *pdomain; |
1180509f ZY |
591 | struct acpi_processor_throttling *pthrottling; |
592 | ||
593 | pthrottling = &pr->throttling; | |
594 | pthrottling->tsd_valid_flag = 0; | |
01854e69 LY |
595 | |
596 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); | |
597 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
598 | if (status != AE_NOT_FOUND) { |
599 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD")); | |
600 | } | |
01854e69 LY |
601 | return -ENODEV; |
602 | } | |
603 | ||
604 | tsd = buffer.pointer; | |
605 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { | |
55ac9a01 | 606 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
607 | result = -EFAULT; |
608 | goto end; | |
609 | } | |
610 | ||
611 | if (tsd->package.count != 1) { | |
55ac9a01 | 612 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
613 | result = -EFAULT; |
614 | goto end; | |
615 | } | |
616 | ||
617 | pdomain = &(pr->throttling.domain_info); | |
618 | ||
619 | state.length = sizeof(struct acpi_tsd_package); | |
620 | state.pointer = pdomain; | |
621 | ||
622 | status = acpi_extract_package(&(tsd->package.elements[0]), | |
ff55a9ce | 623 | &format, &state); |
01854e69 | 624 | if (ACPI_FAILURE(status)) { |
55ac9a01 | 625 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
626 | result = -EFAULT; |
627 | goto end; | |
628 | } | |
629 | ||
630 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { | |
55ac9a01 | 631 | printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n"); |
01854e69 LY |
632 | result = -EFAULT; |
633 | goto end; | |
634 | } | |
635 | ||
636 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { | |
55ac9a01 | 637 | printk(KERN_ERR PREFIX "Unknown _TSD:revision\n"); |
01854e69 LY |
638 | result = -EFAULT; |
639 | goto end; | |
640 | } | |
641 | ||
1180509f ZY |
642 | pthrottling = &pr->throttling; |
643 | pthrottling->tsd_valid_flag = 1; | |
644 | pthrottling->shared_type = pdomain->coord_type; | |
2fdf66b4 | 645 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
646 | /* |
647 | * If the coordination type is not defined in ACPI spec, | |
648 | * the tsd_valid_flag will be clear and coordination type | |
649 | * will be forecd as DOMAIN_COORD_TYPE_SW_ALL. | |
650 | */ | |
651 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
652 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
653 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
654 | pthrottling->tsd_valid_flag = 0; | |
655 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; | |
656 | } | |
657 | ||
ff55a9ce | 658 | end: |
01854e69 LY |
659 | kfree(buffer.pointer); |
660 | return result; | |
661 | } | |
662 | ||
1da177e4 LT |
663 | /* -------------------------------------------------------------------------- |
664 | Throttling Control | |
665 | -------------------------------------------------------------------------- */ | |
01854e69 | 666 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
1da177e4 | 667 | { |
4be44fcd LB |
668 | int state = 0; |
669 | u32 value = 0; | |
670 | u32 duty_mask = 0; | |
671 | u32 duty_value = 0; | |
1da177e4 | 672 | |
1da177e4 | 673 | if (!pr) |
d550d98d | 674 | return -EINVAL; |
1da177e4 LT |
675 | |
676 | if (!pr->flags.throttling) | |
d550d98d | 677 | return -ENODEV; |
1da177e4 | 678 | |
86314751 RW |
679 | /* |
680 | * We don't care about error returns - we just try to mark | |
681 | * these reserved so that nobody else is confused into thinking | |
682 | * that this region might be unused.. | |
683 | * | |
684 | * (In particular, allocating the IO range for Cardbus) | |
685 | */ | |
686 | request_region(pr->throttling.address, 6, "ACPI CPU throttle"); | |
687 | ||
1da177e4 LT |
688 | pr->throttling.state = 0; |
689 | ||
690 | duty_mask = pr->throttling.state_count - 1; | |
691 | ||
692 | duty_mask <<= pr->throttling.duty_offset; | |
693 | ||
694 | local_irq_disable(); | |
695 | ||
696 | value = inl(pr->throttling.address); | |
697 | ||
698 | /* | |
699 | * Compute the current throttling state when throttling is enabled | |
700 | * (bit 4 is on). | |
701 | */ | |
702 | if (value & 0x10) { | |
703 | duty_value = value & duty_mask; | |
704 | duty_value >>= pr->throttling.duty_offset; | |
705 | ||
706 | if (duty_value) | |
4be44fcd | 707 | state = pr->throttling.state_count - duty_value; |
1da177e4 LT |
708 | } |
709 | ||
710 | pr->throttling.state = state; | |
711 | ||
712 | local_irq_enable(); | |
713 | ||
714 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
715 | "Throttling state is T%d (%d%% throttling applied)\n", |
716 | state, pr->throttling.states[state].performance)); | |
1da177e4 | 717 | |
d550d98d | 718 | return 0; |
1da177e4 LT |
719 | } |
720 | ||
f79f06ab | 721 | #ifdef CONFIG_X86 |
9d42a53e | 722 | static int acpi_throttling_rdmsr(u64 *value) |
f79f06ab | 723 | { |
f79f06ab | 724 | u64 msr_high, msr_low; |
f79f06ab ZY |
725 | u64 msr = 0; |
726 | int ret = -1; | |
727 | ||
9d42a53e CL |
728 | if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) || |
729 | !this_cpu_has(X86_FEATURE_ACPI)) { | |
f79f06ab ZY |
730 | printk(KERN_ERR PREFIX |
731 | "HARDWARE addr space,NOT supported yet\n"); | |
732 | } else { | |
733 | msr_low = 0; | |
734 | msr_high = 0; | |
357dc4c3 | 735 | rdmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
736 | (u32 *)&msr_low , (u32 *) &msr_high); |
737 | msr = (msr_high << 32) | msr_low; | |
439913ff | 738 | *value = (u64) msr; |
f79f06ab ZY |
739 | ret = 0; |
740 | } | |
741 | return ret; | |
742 | } | |
743 | ||
9d42a53e | 744 | static int acpi_throttling_wrmsr(u64 value) |
f79f06ab | 745 | { |
f79f06ab ZY |
746 | int ret = -1; |
747 | u64 msr; | |
748 | ||
9d42a53e CL |
749 | if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) || |
750 | !this_cpu_has(X86_FEATURE_ACPI)) { | |
f79f06ab ZY |
751 | printk(KERN_ERR PREFIX |
752 | "HARDWARE addr space,NOT supported yet\n"); | |
753 | } else { | |
754 | msr = value; | |
357dc4c3 | 755 | wrmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
756 | msr & 0xffffffff, msr >> 32); |
757 | ret = 0; | |
758 | } | |
759 | return ret; | |
760 | } | |
761 | #else | |
9d42a53e | 762 | static int acpi_throttling_rdmsr(u64 *value) |
f79f06ab ZY |
763 | { |
764 | printk(KERN_ERR PREFIX | |
765 | "HARDWARE addr space,NOT supported yet\n"); | |
766 | return -1; | |
767 | } | |
768 | ||
9d42a53e | 769 | static int acpi_throttling_wrmsr(u64 value) |
f79f06ab ZY |
770 | { |
771 | printk(KERN_ERR PREFIX | |
772 | "HARDWARE addr space,NOT supported yet\n"); | |
773 | return -1; | |
774 | } | |
775 | #endif | |
776 | ||
0753f6e0 | 777 | static int acpi_read_throttling_status(struct acpi_processor *pr, |
439913ff | 778 | u64 *value) |
01854e69 | 779 | { |
9bcb2721 | 780 | u32 bit_width, bit_offset; |
344e222e | 781 | u32 ptc_value; |
9bcb2721 | 782 | u64 ptc_mask; |
0753f6e0 ZY |
783 | struct acpi_processor_throttling *throttling; |
784 | int ret = -1; | |
785 | ||
786 | throttling = &pr->throttling; | |
01854e69 LY |
787 | switch (throttling->status_register.space_id) { |
788 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
789 | bit_width = throttling->status_register.bit_width; |
790 | bit_offset = throttling->status_register.bit_offset; | |
791 | ||
ff55a9ce | 792 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
344e222e | 793 | address, &ptc_value, |
9bcb2721 ZY |
794 | (u32) (bit_width + bit_offset)); |
795 | ptc_mask = (1 << bit_width) - 1; | |
439913ff | 796 | *value = (u64) ((ptc_value >> bit_offset) & ptc_mask); |
0753f6e0 | 797 | ret = 0; |
01854e69 LY |
798 | break; |
799 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
9d42a53e | 800 | ret = acpi_throttling_rdmsr(value); |
01854e69 LY |
801 | break; |
802 | default: | |
803 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 804 | (u32) (throttling->status_register.space_id)); |
01854e69 | 805 | } |
0753f6e0 | 806 | return ret; |
01854e69 LY |
807 | } |
808 | ||
0753f6e0 | 809 | static int acpi_write_throttling_state(struct acpi_processor *pr, |
439913ff | 810 | u64 value) |
01854e69 | 811 | { |
9bcb2721 | 812 | u32 bit_width, bit_offset; |
0753f6e0 | 813 | u64 ptc_value; |
9bcb2721 | 814 | u64 ptc_mask; |
0753f6e0 | 815 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
816 | int ret = -1; |
817 | ||
0753f6e0 | 818 | throttling = &pr->throttling; |
01854e69 LY |
819 | switch (throttling->control_register.space_id) { |
820 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
821 | bit_width = throttling->control_register.bit_width; |
822 | bit_offset = throttling->control_register.bit_offset; | |
823 | ptc_mask = (1 << bit_width) - 1; | |
824 | ptc_value = value & ptc_mask; | |
825 | ||
ff55a9ce | 826 | acpi_os_write_port((acpi_io_address) throttling-> |
9bcb2721 ZY |
827 | control_register.address, |
828 | (u32) (ptc_value << bit_offset), | |
829 | (u32) (bit_width + bit_offset)); | |
01854e69 LY |
830 | ret = 0; |
831 | break; | |
832 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
9d42a53e | 833 | ret = acpi_throttling_wrmsr(value); |
01854e69 LY |
834 | break; |
835 | default: | |
836 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 837 | (u32) (throttling->control_register.space_id)); |
01854e69 LY |
838 | } |
839 | return ret; | |
840 | } | |
841 | ||
0753f6e0 | 842 | static int acpi_get_throttling_state(struct acpi_processor *pr, |
439913ff | 843 | u64 value) |
01854e69 LY |
844 | { |
845 | int i; | |
846 | ||
847 | for (i = 0; i < pr->throttling.state_count; i++) { | |
ff55a9ce LB |
848 | struct acpi_processor_tx_tss *tx = |
849 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
850 | states_tss[i]); | |
851 | if (tx->control == value) | |
53af9cfb | 852 | return i; |
01854e69 | 853 | } |
53af9cfb | 854 | return -1; |
01854e69 LY |
855 | } |
856 | ||
0753f6e0 | 857 | static int acpi_get_throttling_value(struct acpi_processor *pr, |
439913ff | 858 | int state, u64 *value) |
01854e69 | 859 | { |
0753f6e0 ZY |
860 | int ret = -1; |
861 | ||
ff55a9ce LB |
862 | if (state >= 0 && state <= pr->throttling.state_count) { |
863 | struct acpi_processor_tx_tss *tx = | |
864 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
865 | states_tss[state]); | |
0753f6e0 ZY |
866 | *value = tx->control; |
867 | ret = 0; | |
01854e69 | 868 | } |
0753f6e0 | 869 | return ret; |
01854e69 LY |
870 | } |
871 | ||
872 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) | |
873 | { | |
874 | int state = 0; | |
0753f6e0 | 875 | int ret; |
439913ff | 876 | u64 value; |
01854e69 | 877 | |
01854e69 LY |
878 | if (!pr) |
879 | return -EINVAL; | |
880 | ||
881 | if (!pr->flags.throttling) | |
882 | return -ENODEV; | |
883 | ||
884 | pr->throttling.state = 0; | |
357dc4c3 | 885 | |
0753f6e0 ZY |
886 | value = 0; |
887 | ret = acpi_read_throttling_status(pr, &value); | |
888 | if (ret >= 0) { | |
ff55a9ce | 889 | state = acpi_get_throttling_state(pr, value); |
4973b22a | 890 | if (state == -1) { |
bdf57de4 FP |
891 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
892 | "Invalid throttling state, reset\n")); | |
4973b22a | 893 | state = 0; |
8153f9ac TG |
894 | ret = __acpi_processor_set_throttling(pr, state, true, |
895 | true); | |
4973b22a ZR |
896 | if (ret) |
897 | return ret; | |
898 | } | |
01854e69 LY |
899 | pr->throttling.state = state; |
900 | } | |
01854e69 LY |
901 | |
902 | return 0; | |
903 | } | |
904 | ||
8153f9ac | 905 | static long __acpi_processor_get_throttling(void *data) |
01854e69 | 906 | { |
8153f9ac TG |
907 | struct acpi_processor *pr = data; |
908 | ||
909 | return pr->throttling.acpi_processor_get_throttling(pr); | |
910 | } | |
357dc4c3 | 911 | |
0266d81e TG |
912 | static int call_on_cpu(int cpu, long (*fn)(void *), void *arg, bool direct) |
913 | { | |
914 | if (direct || (is_percpu_thread() && cpu == smp_processor_id())) | |
915 | return fn(arg); | |
916 | return work_on_cpu(cpu, fn, arg); | |
917 | } | |
918 | ||
8153f9ac TG |
919 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
920 | { | |
87654273 ZY |
921 | if (!pr) |
922 | return -EINVAL; | |
923 | ||
924 | if (!pr->flags.throttling) | |
925 | return -ENODEV; | |
2fdf66b4 | 926 | |
357dc4c3 | 927 | /* |
8153f9ac TG |
928 | * This is either called from the CPU hotplug callback of |
929 | * processor_driver or via the ACPI probe function. In the latter | |
930 | * case the CPU is not guaranteed to be online. Both call sites are | |
931 | * protected against CPU hotplug. | |
357dc4c3 | 932 | */ |
8153f9ac | 933 | if (!cpu_online(pr->id)) |
daef1f35 | 934 | return -ENODEV; |
357dc4c3 | 935 | |
0266d81e | 936 | return call_on_cpu(pr->id, __acpi_processor_get_throttling, pr, false); |
01854e69 LY |
937 | } |
938 | ||
22cc5019 ZY |
939 | static int acpi_processor_get_fadt_info(struct acpi_processor *pr) |
940 | { | |
941 | int i, step; | |
942 | ||
943 | if (!pr->throttling.address) { | |
944 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); | |
945 | return -EINVAL; | |
946 | } else if (!pr->throttling.duty_width) { | |
947 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); | |
948 | return -EINVAL; | |
949 | } | |
950 | /* TBD: Support duty_cycle values that span bit 4. */ | |
951 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { | |
952 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); | |
953 | return -EINVAL; | |
954 | } | |
955 | ||
956 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; | |
957 | ||
958 | /* | |
959 | * Compute state values. Note that throttling displays a linear power | |
960 | * performance relationship (at 50% performance the CPU will consume | |
961 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. | |
962 | */ | |
963 | ||
964 | step = (1000 / pr->throttling.state_count); | |
965 | ||
966 | for (i = 0; i < pr->throttling.state_count; i++) { | |
967 | pr->throttling.states[i].performance = 1000 - step * i; | |
968 | pr->throttling.states[i].power = 1000 - step * i; | |
969 | } | |
970 | return 0; | |
971 | } | |
972 | ||
6c5cf8aa | 973 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
2a908002 | 974 | int state, bool force) |
1da177e4 | 975 | { |
4be44fcd LB |
976 | u32 value = 0; |
977 | u32 duty_mask = 0; | |
978 | u32 duty_value = 0; | |
1da177e4 | 979 | |
1da177e4 | 980 | if (!pr) |
d550d98d | 981 | return -EINVAL; |
1da177e4 LT |
982 | |
983 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
d550d98d | 984 | return -EINVAL; |
1da177e4 LT |
985 | |
986 | if (!pr->flags.throttling) | |
d550d98d | 987 | return -ENODEV; |
1da177e4 | 988 | |
2a908002 | 989 | if (!force && (state == pr->throttling.state)) |
d550d98d | 990 | return 0; |
1da177e4 | 991 | |
01854e69 LY |
992 | if (state < pr->throttling_platform_limit) |
993 | return -EPERM; | |
1da177e4 LT |
994 | /* |
995 | * Calculate the duty_value and duty_mask. | |
996 | */ | |
997 | if (state) { | |
998 | duty_value = pr->throttling.state_count - state; | |
999 | ||
1000 | duty_value <<= pr->throttling.duty_offset; | |
1001 | ||
1002 | /* Used to clear all duty_value bits */ | |
1003 | duty_mask = pr->throttling.state_count - 1; | |
1004 | ||
cee324b1 | 1005 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
1da177e4 LT |
1006 | duty_mask = ~duty_mask; |
1007 | } | |
1008 | ||
1009 | local_irq_disable(); | |
1010 | ||
1011 | /* | |
1012 | * Disable throttling by writing a 0 to bit 4. Note that we must | |
1013 | * turn it off before you can change the duty_value. | |
1014 | */ | |
1015 | value = inl(pr->throttling.address); | |
1016 | if (value & 0x10) { | |
1017 | value &= 0xFFFFFFEF; | |
1018 | outl(value, pr->throttling.address); | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * Write the new duty_value and then enable throttling. Note | |
1023 | * that a state value of 0 leaves throttling disabled. | |
1024 | */ | |
1025 | if (state) { | |
1026 | value &= duty_mask; | |
1027 | value |= duty_value; | |
1028 | outl(value, pr->throttling.address); | |
1029 | ||
1030 | value |= 0x00000010; | |
1031 | outl(value, pr->throttling.address); | |
1032 | } | |
1033 | ||
1034 | pr->throttling.state = state; | |
1035 | ||
1036 | local_irq_enable(); | |
1037 | ||
1038 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
1039 | "Throttling state set to T%d (%d%%)\n", state, |
1040 | (pr->throttling.states[state].performance ? pr-> | |
1041 | throttling.states[state].performance / 10 : 0))); | |
1da177e4 | 1042 | |
d550d98d | 1043 | return 0; |
1da177e4 LT |
1044 | } |
1045 | ||
6c5cf8aa | 1046 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
2a908002 | 1047 | int state, bool force) |
01854e69 | 1048 | { |
0753f6e0 | 1049 | int ret; |
439913ff | 1050 | u64 value; |
01854e69 LY |
1051 | |
1052 | if (!pr) | |
1053 | return -EINVAL; | |
1054 | ||
1055 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1056 | return -EINVAL; | |
1057 | ||
1058 | if (!pr->flags.throttling) | |
1059 | return -ENODEV; | |
1060 | ||
2a908002 | 1061 | if (!force && (state == pr->throttling.state)) |
01854e69 LY |
1062 | return 0; |
1063 | ||
1064 | if (state < pr->throttling_platform_limit) | |
1065 | return -EPERM; | |
1066 | ||
0753f6e0 ZY |
1067 | value = 0; |
1068 | ret = acpi_get_throttling_value(pr, state, &value); | |
1069 | if (ret >= 0) { | |
1070 | acpi_write_throttling_state(pr, value); | |
01854e69 LY |
1071 | pr->throttling.state = state; |
1072 | } | |
01854e69 LY |
1073 | |
1074 | return 0; | |
1075 | } | |
1076 | ||
f3ca4164 LT |
1077 | static long acpi_processor_throttling_fn(void *data) |
1078 | { | |
1079 | struct acpi_processor_throttling_arg *arg = data; | |
1080 | struct acpi_processor *pr = arg->pr; | |
1081 | ||
1082 | return pr->throttling.acpi_processor_set_throttling(pr, | |
1083 | arg->target_state, arg->force); | |
1084 | } | |
1085 | ||
8153f9ac TG |
1086 | static int __acpi_processor_set_throttling(struct acpi_processor *pr, |
1087 | int state, bool force, bool direct) | |
01854e69 | 1088 | { |
3391a76f | 1089 | int ret = 0; |
33a2a529 ZY |
1090 | unsigned int i; |
1091 | struct acpi_processor *match_pr; | |
1092 | struct acpi_processor_throttling *p_throttling; | |
f3ca4164 | 1093 | struct acpi_processor_throttling_arg arg; |
33a2a529 | 1094 | struct throttling_tstate t_state; |
87654273 ZY |
1095 | |
1096 | if (!pr) | |
1097 | return -EINVAL; | |
1098 | ||
1099 | if (!pr->flags.throttling) | |
1100 | return -ENODEV; | |
1101 | ||
1102 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1103 | return -EINVAL; | |
1104 | ||
daef1f35 ZY |
1105 | if (cpu_is_offline(pr->id)) { |
1106 | /* | |
1107 | * the cpu pointed by pr->id is offline. Unnecessary to change | |
1108 | * the throttling state any more. | |
1109 | */ | |
1110 | return -ENODEV; | |
1111 | } | |
1112 | ||
33a2a529 ZY |
1113 | t_state.target_state = state; |
1114 | p_throttling = &(pr->throttling); | |
f3ca4164 | 1115 | |
357dc4c3 | 1116 | /* |
33a2a529 ZY |
1117 | * The throttling notifier will be called for every |
1118 | * affected cpu in order to get one proper T-state. | |
1119 | * The notifier event is THROTTLING_PRECHANGE. | |
357dc4c3 | 1120 | */ |
f3ca4164 | 1121 | for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) { |
33a2a529 ZY |
1122 | t_state.cpu = i; |
1123 | acpi_processor_throttling_notifier(THROTTLING_PRECHANGE, | |
1124 | &t_state); | |
1125 | } | |
1126 | /* | |
1127 | * The function of acpi_processor_set_throttling will be called | |
1128 | * to switch T-state. If the coordination type is SW_ALL or HW_ALL, | |
1129 | * it is necessary to call it for every affected cpu. Otherwise | |
1130 | * it can be called only for the cpu pointed by pr. | |
1131 | */ | |
1132 | if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) { | |
f3ca4164 LT |
1133 | arg.pr = pr; |
1134 | arg.target_state = state; | |
1135 | arg.force = force; | |
8153f9ac TG |
1136 | ret = call_on_cpu(pr->id, acpi_processor_throttling_fn, &arg, |
1137 | direct); | |
33a2a529 ZY |
1138 | } else { |
1139 | /* | |
1140 | * When the T-state coordination is SW_ALL or HW_ALL, | |
1141 | * it is necessary to set T-state for every affected | |
1142 | * cpus. | |
1143 | */ | |
f3ca4164 LT |
1144 | for_each_cpu_and(i, cpu_online_mask, |
1145 | p_throttling->shared_cpu_map) { | |
706546d0 | 1146 | match_pr = per_cpu(processors, i); |
33a2a529 ZY |
1147 | /* |
1148 | * If the pointer is invalid, we will report the | |
1149 | * error message and continue. | |
1150 | */ | |
1151 | if (!match_pr) { | |
1152 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1153 | "Invalid Pointer for CPU %d\n", i)); | |
1154 | continue; | |
1155 | } | |
1156 | /* | |
1157 | * If the throttling control is unsupported on CPU i, | |
1158 | * we will report the error message and continue. | |
1159 | */ | |
1160 | if (!match_pr->flags.throttling) { | |
1161 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
25985edc | 1162 | "Throttling Control is unsupported " |
33a2a529 ZY |
1163 | "on CPU %d\n", i)); |
1164 | continue; | |
1165 | } | |
f3ca4164 LT |
1166 | |
1167 | arg.pr = match_pr; | |
1168 | arg.target_state = state; | |
1169 | arg.force = force; | |
8153f9ac TG |
1170 | ret = call_on_cpu(pr->id, acpi_processor_throttling_fn, |
1171 | &arg, direct); | |
33a2a529 ZY |
1172 | } |
1173 | } | |
1174 | /* | |
1175 | * After the set_throttling is called, the | |
1176 | * throttling notifier is called for every | |
1177 | * affected cpu to update the T-states. | |
1178 | * The notifier event is THROTTLING_POSTCHANGE | |
1179 | */ | |
f3ca4164 | 1180 | for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) { |
33a2a529 ZY |
1181 | t_state.cpu = i; |
1182 | acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE, | |
1183 | &t_state); | |
1184 | } | |
f3ca4164 | 1185 | |
357dc4c3 | 1186 | return ret; |
01854e69 LY |
1187 | } |
1188 | ||
8153f9ac TG |
1189 | int acpi_processor_set_throttling(struct acpi_processor *pr, int state, |
1190 | bool force) | |
1191 | { | |
1192 | return __acpi_processor_set_throttling(pr, state, force, false); | |
1193 | } | |
1194 | ||
4be44fcd | 1195 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
1da177e4 | 1196 | { |
4be44fcd | 1197 | int result = 0; |
1180509f | 1198 | struct acpi_processor_throttling *pthrottling; |
1da177e4 | 1199 | |
1da177e4 | 1200 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
1201 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
1202 | pr->throttling.address, | |
1203 | pr->throttling.duty_offset, | |
1204 | pr->throttling.duty_width)); | |
1da177e4 | 1205 | |
c30c620e LB |
1206 | /* |
1207 | * Evaluate _PTC, _TSS and _TPC | |
1208 | * They must all be present or none of them can be used. | |
1209 | */ | |
1210 | if (acpi_processor_get_throttling_control(pr) || | |
1211 | acpi_processor_get_throttling_states(pr) || | |
1212 | acpi_processor_get_platform_limit(pr)) | |
1213 | { | |
ff55a9ce LB |
1214 | pr->throttling.acpi_processor_get_throttling = |
1215 | &acpi_processor_get_throttling_fadt; | |
1216 | pr->throttling.acpi_processor_set_throttling = | |
1217 | &acpi_processor_set_throttling_fadt; | |
d1154be3 AS |
1218 | if (acpi_processor_get_fadt_info(pr)) |
1219 | return 0; | |
01854e69 | 1220 | } else { |
ff55a9ce LB |
1221 | pr->throttling.acpi_processor_get_throttling = |
1222 | &acpi_processor_get_throttling_ptc; | |
1223 | pr->throttling.acpi_processor_set_throttling = | |
1224 | &acpi_processor_set_throttling_ptc; | |
01854e69 | 1225 | } |
1da177e4 | 1226 | |
1180509f ZY |
1227 | /* |
1228 | * If TSD package for one CPU can't be parsed successfully, it means | |
1229 | * that this CPU will have no coordination with other CPUs. | |
1230 | */ | |
1231 | if (acpi_processor_get_tsd(pr)) { | |
1232 | pthrottling = &pr->throttling; | |
1233 | pthrottling->tsd_valid_flag = 0; | |
2fdf66b4 | 1234 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
1235 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
1236 | } | |
c30c620e | 1237 | |
1da177e4 LT |
1238 | /* |
1239 | * PIIX4 Errata: We don't support throttling on the original PIIX4. | |
1240 | * This shouldn't be an issue as few (if any) mobile systems ever | |
1241 | * used this part. | |
1242 | */ | |
1243 | if (errata.piix4.throttle) { | |
1244 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 1245 | "Throttling not supported on PIIX4 A- or B-step\n")); |
d550d98d | 1246 | return 0; |
1da177e4 LT |
1247 | } |
1248 | ||
1da177e4 | 1249 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
4be44fcd | 1250 | pr->throttling.state_count)); |
1da177e4 LT |
1251 | |
1252 | pr->flags.throttling = 1; | |
1253 | ||
1254 | /* | |
1255 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. | |
1256 | * thermal) decide to lower performance if it so chooses, but for now | |
1257 | * we'll crank up the speed. | |
1258 | */ | |
1259 | ||
1260 | result = acpi_processor_get_throttling(pr); | |
1261 | if (result) | |
1262 | goto end; | |
1263 | ||
1264 | if (pr->throttling.state) { | |
4be44fcd LB |
1265 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1266 | "Disabling throttling (was T%d)\n", | |
1267 | pr->throttling.state)); | |
2a908002 | 1268 | result = acpi_processor_set_throttling(pr, 0, false); |
1da177e4 LT |
1269 | if (result) |
1270 | goto end; | |
1271 | } | |
1272 | ||
4be44fcd | 1273 | end: |
1da177e4 LT |
1274 | if (result) |
1275 | pr->flags.throttling = 0; | |
1276 | ||
d550d98d | 1277 | return result; |
1da177e4 LT |
1278 | } |
1279 |