Commit | Line | Data |
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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 | * | |
22 | * You should have received a copy of the GNU General Public License along | |
23 | * with this program; if not, write to the Free Software Foundation, Inc., | |
24 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
25 | * | |
26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
27 | */ | |
28 | ||
29 | #include <linux/kernel.h> | |
30 | #include <linux/module.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
1da177e4 | 32 | #include <linux/init.h> |
357dc4c3 | 33 | #include <linux/sched.h> |
1da177e4 | 34 | #include <linux/cpufreq.h> |
8b48463f LZ |
35 | #include <linux/acpi.h> |
36 | #include <acpi/processor.h> | |
1da177e4 LT |
37 | #include <asm/io.h> |
38 | #include <asm/uaccess.h> | |
39 | ||
a192a958 LB |
40 | #define PREFIX "ACPI: " |
41 | ||
1da177e4 | 42 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 | 43 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
f52fd66d | 44 | ACPI_MODULE_NAME("processor_throttling"); |
1da177e4 | 45 | |
56c213fa ZR |
46 | /* ignore_tpc: |
47 | * 0 -> acpi processor driver doesn't ignore _TPC values | |
48 | * 1 -> acpi processor driver ignores _TPC values | |
49 | */ | |
50 | static int ignore_tpc; | |
51 | module_param(ignore_tpc, int, 0644); | |
52 | MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support"); | |
53 | ||
e4aa5cb2 ZY |
54 | struct throttling_tstate { |
55 | unsigned int cpu; /* cpu nr */ | |
56 | int target_state; /* target T-state */ | |
57 | }; | |
58 | ||
f3ca4164 LT |
59 | struct acpi_processor_throttling_arg { |
60 | struct acpi_processor *pr; | |
61 | int target_state; | |
62 | bool force; | |
63 | }; | |
64 | ||
e4aa5cb2 ZY |
65 | #define THROTTLING_PRECHANGE (1) |
66 | #define THROTTLING_POSTCHANGE (2) | |
67 | ||
ff55a9ce | 68 | static int acpi_processor_get_throttling(struct acpi_processor *pr); |
2a908002 FP |
69 | int acpi_processor_set_throttling(struct acpi_processor *pr, |
70 | int state, bool force); | |
01854e69 | 71 | |
1180509f ZY |
72 | static int acpi_processor_update_tsd_coord(void) |
73 | { | |
74 | int count, count_target; | |
75 | int retval = 0; | |
76 | unsigned int i, j; | |
2fdf66b4 | 77 | cpumask_var_t covered_cpus; |
1180509f ZY |
78 | struct acpi_processor *pr, *match_pr; |
79 | struct acpi_tsd_package *pdomain, *match_pdomain; | |
80 | struct acpi_processor_throttling *pthrottling, *match_pthrottling; | |
81 | ||
79f55997 | 82 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
83 | return -ENOMEM; |
84 | ||
1180509f ZY |
85 | /* |
86 | * Now that we have _TSD data from all CPUs, lets setup T-state | |
33a2a529 | 87 | * coordination between all CPUs. |
1180509f ZY |
88 | */ |
89 | for_each_possible_cpu(i) { | |
706546d0 | 90 | pr = per_cpu(processors, i); |
1180509f ZY |
91 | if (!pr) |
92 | continue; | |
93 | ||
94 | /* Basic validity check for domain info */ | |
95 | pthrottling = &(pr->throttling); | |
96 | ||
97 | /* | |
98 | * If tsd package for one cpu is invalid, the coordination | |
99 | * among all CPUs is thought as invalid. | |
100 | * Maybe it is ugly. | |
101 | */ | |
102 | if (!pthrottling->tsd_valid_flag) { | |
103 | retval = -EINVAL; | |
104 | break; | |
105 | } | |
106 | } | |
107 | if (retval) | |
108 | goto err_ret; | |
109 | ||
1180509f | 110 | for_each_possible_cpu(i) { |
706546d0 | 111 | pr = per_cpu(processors, i); |
1180509f ZY |
112 | if (!pr) |
113 | continue; | |
114 | ||
2fdf66b4 | 115 | if (cpumask_test_cpu(i, covered_cpus)) |
1180509f ZY |
116 | continue; |
117 | pthrottling = &pr->throttling; | |
118 | ||
119 | pdomain = &(pthrottling->domain_info); | |
2fdf66b4 RR |
120 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); |
121 | cpumask_set_cpu(i, covered_cpus); | |
1180509f ZY |
122 | /* |
123 | * If the number of processor in the TSD domain is 1, it is | |
124 | * unnecessary to parse the coordination for this CPU. | |
125 | */ | |
126 | if (pdomain->num_processors <= 1) | |
127 | continue; | |
128 | ||
129 | /* Validate the Domain info */ | |
130 | count_target = pdomain->num_processors; | |
131 | count = 1; | |
132 | ||
133 | for_each_possible_cpu(j) { | |
134 | if (i == j) | |
135 | continue; | |
136 | ||
706546d0 | 137 | match_pr = per_cpu(processors, j); |
1180509f ZY |
138 | if (!match_pr) |
139 | continue; | |
140 | ||
141 | match_pthrottling = &(match_pr->throttling); | |
142 | match_pdomain = &(match_pthrottling->domain_info); | |
143 | if (match_pdomain->domain != pdomain->domain) | |
144 | continue; | |
145 | ||
146 | /* Here i and j are in the same domain. | |
147 | * If two TSD packages have the same domain, they | |
148 | * should have the same num_porcessors and | |
149 | * coordination type. Otherwise it will be regarded | |
150 | * as illegal. | |
151 | */ | |
152 | if (match_pdomain->num_processors != count_target) { | |
153 | retval = -EINVAL; | |
154 | goto err_ret; | |
155 | } | |
156 | ||
157 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
158 | retval = -EINVAL; | |
159 | goto err_ret; | |
160 | } | |
161 | ||
2fdf66b4 RR |
162 | cpumask_set_cpu(j, covered_cpus); |
163 | cpumask_set_cpu(j, pthrottling->shared_cpu_map); | |
1180509f ZY |
164 | count++; |
165 | } | |
166 | for_each_possible_cpu(j) { | |
167 | if (i == j) | |
168 | continue; | |
169 | ||
706546d0 | 170 | match_pr = per_cpu(processors, j); |
1180509f ZY |
171 | if (!match_pr) |
172 | continue; | |
173 | ||
174 | match_pthrottling = &(match_pr->throttling); | |
175 | match_pdomain = &(match_pthrottling->domain_info); | |
176 | if (match_pdomain->domain != pdomain->domain) | |
177 | continue; | |
178 | ||
179 | /* | |
180 | * If some CPUS have the same domain, they | |
181 | * will have the same shared_cpu_map. | |
182 | */ | |
2fdf66b4 RR |
183 | cpumask_copy(match_pthrottling->shared_cpu_map, |
184 | pthrottling->shared_cpu_map); | |
1180509f ZY |
185 | } |
186 | } | |
187 | ||
188 | err_ret: | |
2fdf66b4 RR |
189 | free_cpumask_var(covered_cpus); |
190 | ||
1180509f | 191 | for_each_possible_cpu(i) { |
706546d0 | 192 | pr = per_cpu(processors, i); |
1180509f ZY |
193 | if (!pr) |
194 | continue; | |
195 | ||
196 | /* | |
197 | * Assume no coordination on any error parsing domain info. | |
198 | * The coordination type will be forced as SW_ALL. | |
199 | */ | |
200 | if (retval) { | |
201 | pthrottling = &(pr->throttling); | |
2fdf66b4 RR |
202 | cpumask_clear(pthrottling->shared_cpu_map); |
203 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); | |
1180509f ZY |
204 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
205 | } | |
206 | } | |
207 | ||
208 | return retval; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Update the T-state coordination after the _TSD | |
213 | * data for all cpus is obtained. | |
214 | */ | |
215 | void acpi_processor_throttling_init(void) | |
216 | { | |
2d5914cc | 217 | if (acpi_processor_update_tsd_coord()) { |
1180509f ZY |
218 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
219 | "Assume no T-state coordination\n")); | |
2d5914cc | 220 | } |
1180509f ZY |
221 | |
222 | return; | |
223 | } | |
224 | ||
e4aa5cb2 ZY |
225 | static int acpi_processor_throttling_notifier(unsigned long event, void *data) |
226 | { | |
227 | struct throttling_tstate *p_tstate = data; | |
228 | struct acpi_processor *pr; | |
229 | unsigned int cpu ; | |
230 | int target_state; | |
231 | struct acpi_processor_limit *p_limit; | |
232 | struct acpi_processor_throttling *p_throttling; | |
233 | ||
234 | cpu = p_tstate->cpu; | |
706546d0 | 235 | pr = per_cpu(processors, cpu); |
e4aa5cb2 ZY |
236 | if (!pr) { |
237 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n")); | |
238 | return 0; | |
239 | } | |
240 | if (!pr->flags.throttling) { | |
241 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is " | |
242 | "unsupported on CPU %d\n", cpu)); | |
243 | return 0; | |
244 | } | |
245 | target_state = p_tstate->target_state; | |
246 | p_throttling = &(pr->throttling); | |
247 | switch (event) { | |
248 | case THROTTLING_PRECHANGE: | |
249 | /* | |
250 | * Prechange event is used to choose one proper t-state, | |
251 | * which meets the limits of thermal, user and _TPC. | |
252 | */ | |
253 | p_limit = &pr->limit; | |
254 | if (p_limit->thermal.tx > target_state) | |
255 | target_state = p_limit->thermal.tx; | |
256 | if (p_limit->user.tx > target_state) | |
257 | target_state = p_limit->user.tx; | |
258 | if (pr->throttling_platform_limit > target_state) | |
259 | target_state = pr->throttling_platform_limit; | |
260 | if (target_state >= p_throttling->state_count) { | |
261 | printk(KERN_WARNING | |
262 | "Exceed the limit of T-state \n"); | |
263 | target_state = p_throttling->state_count - 1; | |
264 | } | |
265 | p_tstate->target_state = target_state; | |
266 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:" | |
267 | "target T-state of CPU %d is T%d\n", | |
268 | cpu, target_state)); | |
269 | break; | |
270 | case THROTTLING_POSTCHANGE: | |
271 | /* | |
272 | * Postchange event is only used to update the | |
273 | * T-state flag of acpi_processor_throttling. | |
274 | */ | |
275 | p_throttling->state = target_state; | |
276 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:" | |
277 | "CPU %d is switched to T%d\n", | |
278 | cpu, target_state)); | |
279 | break; | |
280 | default: | |
281 | printk(KERN_WARNING | |
282 | "Unsupported Throttling notifier event\n"); | |
283 | break; | |
284 | } | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
c30c620e LB |
289 | /* |
290 | * _TPC - Throttling Present Capabilities | |
291 | */ | |
01854e69 LY |
292 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
293 | { | |
294 | acpi_status status = 0; | |
27663c58 | 295 | unsigned long long tpc = 0; |
01854e69 | 296 | |
ff55a9ce | 297 | if (!pr) |
01854e69 | 298 | return -EINVAL; |
56c213fa ZR |
299 | |
300 | if (ignore_tpc) | |
301 | goto end; | |
302 | ||
01854e69 | 303 | status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); |
c30c620e LB |
304 | if (ACPI_FAILURE(status)) { |
305 | if (status != AE_NOT_FOUND) { | |
306 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC")); | |
307 | } | |
01854e69 LY |
308 | return -ENODEV; |
309 | } | |
56c213fa ZR |
310 | |
311 | end: | |
01854e69 LY |
312 | pr->throttling_platform_limit = (int)tpc; |
313 | return 0; | |
314 | } | |
315 | ||
316 | int acpi_processor_tstate_has_changed(struct acpi_processor *pr) | |
317 | { | |
ef54d5ad ZY |
318 | int result = 0; |
319 | int throttling_limit; | |
320 | int current_state; | |
321 | struct acpi_processor_limit *limit; | |
322 | int target_state; | |
323 | ||
56c213fa ZR |
324 | if (ignore_tpc) |
325 | return 0; | |
326 | ||
ef54d5ad ZY |
327 | result = acpi_processor_get_platform_limit(pr); |
328 | if (result) { | |
329 | /* Throttling Limit is unsupported */ | |
330 | return result; | |
331 | } | |
332 | ||
333 | throttling_limit = pr->throttling_platform_limit; | |
334 | if (throttling_limit >= pr->throttling.state_count) { | |
335 | /* Uncorrect Throttling Limit */ | |
336 | return -EINVAL; | |
337 | } | |
338 | ||
339 | current_state = pr->throttling.state; | |
340 | if (current_state > throttling_limit) { | |
341 | /* | |
342 | * The current state can meet the requirement of | |
343 | * _TPC limit. But it is reasonable that OSPM changes | |
344 | * t-states from high to low for better performance. | |
345 | * Of course the limit condition of thermal | |
346 | * and user should be considered. | |
347 | */ | |
348 | limit = &pr->limit; | |
349 | target_state = throttling_limit; | |
350 | if (limit->thermal.tx > target_state) | |
351 | target_state = limit->thermal.tx; | |
352 | if (limit->user.tx > target_state) | |
353 | target_state = limit->user.tx; | |
354 | } else if (current_state == throttling_limit) { | |
355 | /* | |
356 | * Unnecessary to change the throttling state | |
357 | */ | |
358 | return 0; | |
359 | } else { | |
360 | /* | |
361 | * If the current state is lower than the limit of _TPC, it | |
362 | * will be forced to switch to the throttling state defined | |
363 | * by throttling_platfor_limit. | |
364 | * Because the previous state meets with the limit condition | |
365 | * of thermal and user, it is unnecessary to check it again. | |
366 | */ | |
367 | target_state = throttling_limit; | |
368 | } | |
2a908002 | 369 | return acpi_processor_set_throttling(pr, target_state, false); |
01854e69 LY |
370 | } |
371 | ||
5a344a50 ZY |
372 | /* |
373 | * This function is used to reevaluate whether the T-state is valid | |
374 | * after one CPU is onlined/offlined. | |
375 | * It is noted that it won't reevaluate the following properties for | |
376 | * the T-state. | |
377 | * 1. Control method. | |
378 | * 2. the number of supported T-state | |
379 | * 3. TSD domain | |
380 | */ | |
381 | void acpi_processor_reevaluate_tstate(struct acpi_processor *pr, | |
382 | unsigned long action) | |
383 | { | |
384 | int result = 0; | |
385 | ||
386 | if (action == CPU_DEAD) { | |
387 | /* When one CPU is offline, the T-state throttling | |
388 | * will be invalidated. | |
389 | */ | |
390 | pr->flags.throttling = 0; | |
391 | return; | |
392 | } | |
393 | /* the following is to recheck whether the T-state is valid for | |
394 | * the online CPU | |
395 | */ | |
396 | if (!pr->throttling.state_count) { | |
397 | /* If the number of T-state is invalid, it is | |
398 | * invalidated. | |
399 | */ | |
400 | pr->flags.throttling = 0; | |
401 | return; | |
402 | } | |
403 | pr->flags.throttling = 1; | |
404 | ||
405 | /* Disable throttling (if enabled). We'll let subsequent | |
406 | * policy (e.g.thermal) decide to lower performance if it | |
407 | * so chooses, but for now we'll crank up the speed. | |
408 | */ | |
409 | ||
410 | result = acpi_processor_get_throttling(pr); | |
411 | if (result) | |
412 | goto end; | |
413 | ||
414 | if (pr->throttling.state) { | |
415 | result = acpi_processor_set_throttling(pr, 0, false); | |
416 | if (result) | |
417 | goto end; | |
418 | } | |
419 | ||
420 | end: | |
421 | if (result) | |
422 | pr->flags.throttling = 0; | |
423 | } | |
c30c620e LB |
424 | /* |
425 | * _PTC - Processor Throttling Control (and status) register location | |
426 | */ | |
01854e69 LY |
427 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) |
428 | { | |
429 | int result = 0; | |
430 | acpi_status status = 0; | |
431 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
432 | union acpi_object *ptc = NULL; | |
433 | union acpi_object obj = { 0 }; | |
9bcb2721 | 434 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
435 | |
436 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); | |
437 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
438 | if (status != AE_NOT_FOUND) { |
439 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); | |
440 | } | |
01854e69 LY |
441 | return -ENODEV; |
442 | } | |
443 | ||
444 | ptc = (union acpi_object *)buffer.pointer; | |
445 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) | |
446 | || (ptc->package.count != 2)) { | |
447 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); | |
448 | result = -EFAULT; | |
449 | goto end; | |
450 | } | |
451 | ||
452 | /* | |
453 | * control_register | |
454 | */ | |
455 | ||
456 | obj = ptc->package.elements[0]; | |
457 | ||
458 | if ((obj.type != ACPI_TYPE_BUFFER) | |
459 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
460 | || (obj.buffer.pointer == NULL)) { | |
ff55a9ce LB |
461 | printk(KERN_ERR PREFIX |
462 | "Invalid _PTC data (control_register)\n"); | |
01854e69 LY |
463 | result = -EFAULT; |
464 | goto end; | |
465 | } | |
466 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, | |
467 | sizeof(struct acpi_ptc_register)); | |
468 | ||
469 | /* | |
470 | * status_register | |
471 | */ | |
472 | ||
473 | obj = ptc->package.elements[1]; | |
474 | ||
475 | if ((obj.type != ACPI_TYPE_BUFFER) | |
476 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
477 | || (obj.buffer.pointer == NULL)) { | |
478 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); | |
479 | result = -EFAULT; | |
480 | goto end; | |
481 | } | |
482 | ||
483 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, | |
ff55a9ce | 484 | sizeof(struct acpi_ptc_register)); |
01854e69 | 485 | |
9bcb2721 ZY |
486 | throttling = &pr->throttling; |
487 | ||
488 | if ((throttling->control_register.bit_width + | |
489 | throttling->control_register.bit_offset) > 32) { | |
490 | printk(KERN_ERR PREFIX "Invalid _PTC control register\n"); | |
491 | result = -EFAULT; | |
492 | goto end; | |
493 | } | |
494 | ||
495 | if ((throttling->status_register.bit_width + | |
496 | throttling->status_register.bit_offset) > 32) { | |
497 | printk(KERN_ERR PREFIX "Invalid _PTC status register\n"); | |
498 | result = -EFAULT; | |
499 | goto end; | |
500 | } | |
501 | ||
ff55a9ce | 502 | end: |
01854e69 LY |
503 | kfree(buffer.pointer); |
504 | ||
505 | return result; | |
506 | } | |
c30c620e LB |
507 | |
508 | /* | |
509 | * _TSS - Throttling Supported States | |
510 | */ | |
01854e69 LY |
511 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) |
512 | { | |
513 | int result = 0; | |
514 | acpi_status status = AE_OK; | |
515 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
516 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
517 | struct acpi_buffer state = { 0, NULL }; | |
518 | union acpi_object *tss = NULL; | |
519 | int i; | |
520 | ||
521 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); | |
522 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
523 | if (status != AE_NOT_FOUND) { |
524 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); | |
525 | } | |
01854e69 LY |
526 | return -ENODEV; |
527 | } | |
528 | ||
529 | tss = buffer.pointer; | |
530 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { | |
531 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); | |
532 | result = -EFAULT; | |
533 | goto end; | |
534 | } | |
535 | ||
536 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
537 | tss->package.count)); | |
538 | ||
539 | pr->throttling.state_count = tss->package.count; | |
540 | pr->throttling.states_tss = | |
541 | kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count, | |
542 | GFP_KERNEL); | |
543 | if (!pr->throttling.states_tss) { | |
544 | result = -ENOMEM; | |
545 | goto end; | |
546 | } | |
547 | ||
548 | for (i = 0; i < pr->throttling.state_count; i++) { | |
549 | ||
ff55a9ce LB |
550 | struct acpi_processor_tx_tss *tx = |
551 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
552 | states_tss[i]); | |
01854e69 LY |
553 | |
554 | state.length = sizeof(struct acpi_processor_tx_tss); | |
555 | state.pointer = tx; | |
556 | ||
557 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
558 | ||
559 | status = acpi_extract_package(&(tss->package.elements[i]), | |
560 | &format, &state); | |
561 | if (ACPI_FAILURE(status)) { | |
562 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); | |
563 | result = -EFAULT; | |
564 | kfree(pr->throttling.states_tss); | |
565 | goto end; | |
566 | } | |
567 | ||
568 | if (!tx->freqpercentage) { | |
569 | printk(KERN_ERR PREFIX | |
ff55a9ce | 570 | "Invalid _TSS data: freq is zero\n"); |
01854e69 LY |
571 | result = -EFAULT; |
572 | kfree(pr->throttling.states_tss); | |
573 | goto end; | |
574 | } | |
575 | } | |
576 | ||
577 | end: | |
578 | kfree(buffer.pointer); | |
579 | ||
580 | return result; | |
581 | } | |
c30c620e LB |
582 | |
583 | /* | |
584 | * _TSD - T-State Dependencies | |
585 | */ | |
ff55a9ce | 586 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
01854e69 LY |
587 | { |
588 | int result = 0; | |
589 | acpi_status status = AE_OK; | |
ff55a9ce LB |
590 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
591 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
592 | struct acpi_buffer state = { 0, NULL }; | |
593 | union acpi_object *tsd = NULL; | |
01854e69 | 594 | struct acpi_tsd_package *pdomain; |
1180509f ZY |
595 | struct acpi_processor_throttling *pthrottling; |
596 | ||
597 | pthrottling = &pr->throttling; | |
598 | pthrottling->tsd_valid_flag = 0; | |
01854e69 LY |
599 | |
600 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); | |
601 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
602 | if (status != AE_NOT_FOUND) { |
603 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD")); | |
604 | } | |
01854e69 LY |
605 | return -ENODEV; |
606 | } | |
607 | ||
608 | tsd = buffer.pointer; | |
609 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { | |
55ac9a01 | 610 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
611 | result = -EFAULT; |
612 | goto end; | |
613 | } | |
614 | ||
615 | if (tsd->package.count != 1) { | |
55ac9a01 | 616 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
617 | result = -EFAULT; |
618 | goto end; | |
619 | } | |
620 | ||
621 | pdomain = &(pr->throttling.domain_info); | |
622 | ||
623 | state.length = sizeof(struct acpi_tsd_package); | |
624 | state.pointer = pdomain; | |
625 | ||
626 | status = acpi_extract_package(&(tsd->package.elements[0]), | |
ff55a9ce | 627 | &format, &state); |
01854e69 | 628 | if (ACPI_FAILURE(status)) { |
55ac9a01 | 629 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
630 | result = -EFAULT; |
631 | goto end; | |
632 | } | |
633 | ||
634 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { | |
55ac9a01 | 635 | printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n"); |
01854e69 LY |
636 | result = -EFAULT; |
637 | goto end; | |
638 | } | |
639 | ||
640 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { | |
55ac9a01 | 641 | printk(KERN_ERR PREFIX "Unknown _TSD:revision\n"); |
01854e69 LY |
642 | result = -EFAULT; |
643 | goto end; | |
644 | } | |
645 | ||
1180509f ZY |
646 | pthrottling = &pr->throttling; |
647 | pthrottling->tsd_valid_flag = 1; | |
648 | pthrottling->shared_type = pdomain->coord_type; | |
2fdf66b4 | 649 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
650 | /* |
651 | * If the coordination type is not defined in ACPI spec, | |
652 | * the tsd_valid_flag will be clear and coordination type | |
653 | * will be forecd as DOMAIN_COORD_TYPE_SW_ALL. | |
654 | */ | |
655 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
656 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
657 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
658 | pthrottling->tsd_valid_flag = 0; | |
659 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; | |
660 | } | |
661 | ||
ff55a9ce | 662 | end: |
01854e69 LY |
663 | kfree(buffer.pointer); |
664 | return result; | |
665 | } | |
666 | ||
1da177e4 LT |
667 | /* -------------------------------------------------------------------------- |
668 | Throttling Control | |
669 | -------------------------------------------------------------------------- */ | |
01854e69 | 670 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
1da177e4 | 671 | { |
4be44fcd LB |
672 | int state = 0; |
673 | u32 value = 0; | |
674 | u32 duty_mask = 0; | |
675 | u32 duty_value = 0; | |
1da177e4 | 676 | |
1da177e4 | 677 | if (!pr) |
d550d98d | 678 | return -EINVAL; |
1da177e4 LT |
679 | |
680 | if (!pr->flags.throttling) | |
d550d98d | 681 | return -ENODEV; |
1da177e4 LT |
682 | |
683 | pr->throttling.state = 0; | |
684 | ||
685 | duty_mask = pr->throttling.state_count - 1; | |
686 | ||
687 | duty_mask <<= pr->throttling.duty_offset; | |
688 | ||
689 | local_irq_disable(); | |
690 | ||
691 | value = inl(pr->throttling.address); | |
692 | ||
693 | /* | |
694 | * Compute the current throttling state when throttling is enabled | |
695 | * (bit 4 is on). | |
696 | */ | |
697 | if (value & 0x10) { | |
698 | duty_value = value & duty_mask; | |
699 | duty_value >>= pr->throttling.duty_offset; | |
700 | ||
701 | if (duty_value) | |
4be44fcd | 702 | state = pr->throttling.state_count - duty_value; |
1da177e4 LT |
703 | } |
704 | ||
705 | pr->throttling.state = state; | |
706 | ||
707 | local_irq_enable(); | |
708 | ||
709 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
710 | "Throttling state is T%d (%d%% throttling applied)\n", |
711 | state, pr->throttling.states[state].performance)); | |
1da177e4 | 712 | |
d550d98d | 713 | return 0; |
1da177e4 LT |
714 | } |
715 | ||
f79f06ab | 716 | #ifdef CONFIG_X86 |
9d42a53e | 717 | static int acpi_throttling_rdmsr(u64 *value) |
f79f06ab | 718 | { |
f79f06ab | 719 | u64 msr_high, msr_low; |
f79f06ab ZY |
720 | u64 msr = 0; |
721 | int ret = -1; | |
722 | ||
9d42a53e CL |
723 | if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) || |
724 | !this_cpu_has(X86_FEATURE_ACPI)) { | |
f79f06ab ZY |
725 | printk(KERN_ERR PREFIX |
726 | "HARDWARE addr space,NOT supported yet\n"); | |
727 | } else { | |
728 | msr_low = 0; | |
729 | msr_high = 0; | |
357dc4c3 | 730 | rdmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
731 | (u32 *)&msr_low , (u32 *) &msr_high); |
732 | msr = (msr_high << 32) | msr_low; | |
439913ff | 733 | *value = (u64) msr; |
f79f06ab ZY |
734 | ret = 0; |
735 | } | |
736 | return ret; | |
737 | } | |
738 | ||
9d42a53e | 739 | static int acpi_throttling_wrmsr(u64 value) |
f79f06ab | 740 | { |
f79f06ab ZY |
741 | int ret = -1; |
742 | u64 msr; | |
743 | ||
9d42a53e CL |
744 | if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) || |
745 | !this_cpu_has(X86_FEATURE_ACPI)) { | |
f79f06ab ZY |
746 | printk(KERN_ERR PREFIX |
747 | "HARDWARE addr space,NOT supported yet\n"); | |
748 | } else { | |
749 | msr = value; | |
357dc4c3 | 750 | wrmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
751 | msr & 0xffffffff, msr >> 32); |
752 | ret = 0; | |
753 | } | |
754 | return ret; | |
755 | } | |
756 | #else | |
9d42a53e | 757 | static int acpi_throttling_rdmsr(u64 *value) |
f79f06ab ZY |
758 | { |
759 | printk(KERN_ERR PREFIX | |
760 | "HARDWARE addr space,NOT supported yet\n"); | |
761 | return -1; | |
762 | } | |
763 | ||
9d42a53e | 764 | static int acpi_throttling_wrmsr(u64 value) |
f79f06ab ZY |
765 | { |
766 | printk(KERN_ERR PREFIX | |
767 | "HARDWARE addr space,NOT supported yet\n"); | |
768 | return -1; | |
769 | } | |
770 | #endif | |
771 | ||
0753f6e0 | 772 | static int acpi_read_throttling_status(struct acpi_processor *pr, |
439913ff | 773 | u64 *value) |
01854e69 | 774 | { |
9bcb2721 | 775 | u32 bit_width, bit_offset; |
344e222e | 776 | u32 ptc_value; |
9bcb2721 | 777 | u64 ptc_mask; |
0753f6e0 ZY |
778 | struct acpi_processor_throttling *throttling; |
779 | int ret = -1; | |
780 | ||
781 | throttling = &pr->throttling; | |
01854e69 LY |
782 | switch (throttling->status_register.space_id) { |
783 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
784 | bit_width = throttling->status_register.bit_width; |
785 | bit_offset = throttling->status_register.bit_offset; | |
786 | ||
ff55a9ce | 787 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
344e222e | 788 | address, &ptc_value, |
9bcb2721 ZY |
789 | (u32) (bit_width + bit_offset)); |
790 | ptc_mask = (1 << bit_width) - 1; | |
439913ff | 791 | *value = (u64) ((ptc_value >> bit_offset) & ptc_mask); |
0753f6e0 | 792 | ret = 0; |
01854e69 LY |
793 | break; |
794 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
9d42a53e | 795 | ret = acpi_throttling_rdmsr(value); |
01854e69 LY |
796 | break; |
797 | default: | |
798 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 799 | (u32) (throttling->status_register.space_id)); |
01854e69 | 800 | } |
0753f6e0 | 801 | return ret; |
01854e69 LY |
802 | } |
803 | ||
0753f6e0 | 804 | static int acpi_write_throttling_state(struct acpi_processor *pr, |
439913ff | 805 | u64 value) |
01854e69 | 806 | { |
9bcb2721 | 807 | u32 bit_width, bit_offset; |
0753f6e0 | 808 | u64 ptc_value; |
9bcb2721 | 809 | u64 ptc_mask; |
0753f6e0 | 810 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
811 | int ret = -1; |
812 | ||
0753f6e0 | 813 | throttling = &pr->throttling; |
01854e69 LY |
814 | switch (throttling->control_register.space_id) { |
815 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
816 | bit_width = throttling->control_register.bit_width; |
817 | bit_offset = throttling->control_register.bit_offset; | |
818 | ptc_mask = (1 << bit_width) - 1; | |
819 | ptc_value = value & ptc_mask; | |
820 | ||
ff55a9ce | 821 | acpi_os_write_port((acpi_io_address) throttling-> |
9bcb2721 ZY |
822 | control_register.address, |
823 | (u32) (ptc_value << bit_offset), | |
824 | (u32) (bit_width + bit_offset)); | |
01854e69 LY |
825 | ret = 0; |
826 | break; | |
827 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
9d42a53e | 828 | ret = acpi_throttling_wrmsr(value); |
01854e69 LY |
829 | break; |
830 | default: | |
831 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 832 | (u32) (throttling->control_register.space_id)); |
01854e69 LY |
833 | } |
834 | return ret; | |
835 | } | |
836 | ||
0753f6e0 | 837 | static int acpi_get_throttling_state(struct acpi_processor *pr, |
439913ff | 838 | u64 value) |
01854e69 LY |
839 | { |
840 | int i; | |
841 | ||
842 | for (i = 0; i < pr->throttling.state_count; i++) { | |
ff55a9ce LB |
843 | struct acpi_processor_tx_tss *tx = |
844 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
845 | states_tss[i]); | |
846 | if (tx->control == value) | |
53af9cfb | 847 | return i; |
01854e69 | 848 | } |
53af9cfb | 849 | return -1; |
01854e69 LY |
850 | } |
851 | ||
0753f6e0 | 852 | static int acpi_get_throttling_value(struct acpi_processor *pr, |
439913ff | 853 | int state, u64 *value) |
01854e69 | 854 | { |
0753f6e0 ZY |
855 | int ret = -1; |
856 | ||
ff55a9ce LB |
857 | if (state >= 0 && state <= pr->throttling.state_count) { |
858 | struct acpi_processor_tx_tss *tx = | |
859 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
860 | states_tss[state]); | |
0753f6e0 ZY |
861 | *value = tx->control; |
862 | ret = 0; | |
01854e69 | 863 | } |
0753f6e0 | 864 | return ret; |
01854e69 LY |
865 | } |
866 | ||
867 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) | |
868 | { | |
869 | int state = 0; | |
0753f6e0 | 870 | int ret; |
439913ff | 871 | u64 value; |
01854e69 | 872 | |
01854e69 LY |
873 | if (!pr) |
874 | return -EINVAL; | |
875 | ||
876 | if (!pr->flags.throttling) | |
877 | return -ENODEV; | |
878 | ||
879 | pr->throttling.state = 0; | |
357dc4c3 | 880 | |
0753f6e0 ZY |
881 | value = 0; |
882 | ret = acpi_read_throttling_status(pr, &value); | |
883 | if (ret >= 0) { | |
ff55a9ce | 884 | state = acpi_get_throttling_state(pr, value); |
4973b22a | 885 | if (state == -1) { |
bdf57de4 FP |
886 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
887 | "Invalid throttling state, reset\n")); | |
4973b22a | 888 | state = 0; |
2a908002 | 889 | ret = acpi_processor_set_throttling(pr, state, true); |
4973b22a ZR |
890 | if (ret) |
891 | return ret; | |
892 | } | |
01854e69 LY |
893 | pr->throttling.state = state; |
894 | } | |
01854e69 LY |
895 | |
896 | return 0; | |
897 | } | |
898 | ||
01854e69 LY |
899 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
900 | { | |
2fdf66b4 | 901 | cpumask_var_t saved_mask; |
357dc4c3 ZY |
902 | int ret; |
903 | ||
87654273 ZY |
904 | if (!pr) |
905 | return -EINVAL; | |
906 | ||
907 | if (!pr->flags.throttling) | |
908 | return -ENODEV; | |
2fdf66b4 RR |
909 | |
910 | if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL)) | |
911 | return -ENOMEM; | |
912 | ||
357dc4c3 ZY |
913 | /* |
914 | * Migrate task to the cpu pointed by pr. | |
915 | */ | |
2fdf66b4 RR |
916 | cpumask_copy(saved_mask, ¤t->cpus_allowed); |
917 | /* FIXME: use work_on_cpu() */ | |
daef1f35 ZY |
918 | if (set_cpus_allowed_ptr(current, cpumask_of(pr->id))) { |
919 | /* Can't migrate to the target pr->id CPU. Exit */ | |
920 | free_cpumask_var(saved_mask); | |
921 | return -ENODEV; | |
922 | } | |
357dc4c3 ZY |
923 | ret = pr->throttling.acpi_processor_get_throttling(pr); |
924 | /* restore the previous state */ | |
2fdf66b4 RR |
925 | set_cpus_allowed_ptr(current, saved_mask); |
926 | free_cpumask_var(saved_mask); | |
357dc4c3 ZY |
927 | |
928 | return ret; | |
01854e69 LY |
929 | } |
930 | ||
22cc5019 ZY |
931 | static int acpi_processor_get_fadt_info(struct acpi_processor *pr) |
932 | { | |
933 | int i, step; | |
934 | ||
935 | if (!pr->throttling.address) { | |
936 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); | |
937 | return -EINVAL; | |
938 | } else if (!pr->throttling.duty_width) { | |
939 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); | |
940 | return -EINVAL; | |
941 | } | |
942 | /* TBD: Support duty_cycle values that span bit 4. */ | |
943 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { | |
944 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); | |
945 | return -EINVAL; | |
946 | } | |
947 | ||
948 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; | |
949 | ||
950 | /* | |
951 | * Compute state values. Note that throttling displays a linear power | |
952 | * performance relationship (at 50% performance the CPU will consume | |
953 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. | |
954 | */ | |
955 | ||
956 | step = (1000 / pr->throttling.state_count); | |
957 | ||
958 | for (i = 0; i < pr->throttling.state_count; i++) { | |
959 | pr->throttling.states[i].performance = 1000 - step * i; | |
960 | pr->throttling.states[i].power = 1000 - step * i; | |
961 | } | |
962 | return 0; | |
963 | } | |
964 | ||
6c5cf8aa | 965 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
2a908002 | 966 | int state, bool force) |
1da177e4 | 967 | { |
4be44fcd LB |
968 | u32 value = 0; |
969 | u32 duty_mask = 0; | |
970 | u32 duty_value = 0; | |
1da177e4 | 971 | |
1da177e4 | 972 | if (!pr) |
d550d98d | 973 | return -EINVAL; |
1da177e4 LT |
974 | |
975 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
d550d98d | 976 | return -EINVAL; |
1da177e4 LT |
977 | |
978 | if (!pr->flags.throttling) | |
d550d98d | 979 | return -ENODEV; |
1da177e4 | 980 | |
2a908002 | 981 | if (!force && (state == pr->throttling.state)) |
d550d98d | 982 | return 0; |
1da177e4 | 983 | |
01854e69 LY |
984 | if (state < pr->throttling_platform_limit) |
985 | return -EPERM; | |
1da177e4 LT |
986 | /* |
987 | * Calculate the duty_value and duty_mask. | |
988 | */ | |
989 | if (state) { | |
990 | duty_value = pr->throttling.state_count - state; | |
991 | ||
992 | duty_value <<= pr->throttling.duty_offset; | |
993 | ||
994 | /* Used to clear all duty_value bits */ | |
995 | duty_mask = pr->throttling.state_count - 1; | |
996 | ||
cee324b1 | 997 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
1da177e4 LT |
998 | duty_mask = ~duty_mask; |
999 | } | |
1000 | ||
1001 | local_irq_disable(); | |
1002 | ||
1003 | /* | |
1004 | * Disable throttling by writing a 0 to bit 4. Note that we must | |
1005 | * turn it off before you can change the duty_value. | |
1006 | */ | |
1007 | value = inl(pr->throttling.address); | |
1008 | if (value & 0x10) { | |
1009 | value &= 0xFFFFFFEF; | |
1010 | outl(value, pr->throttling.address); | |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | * Write the new duty_value and then enable throttling. Note | |
1015 | * that a state value of 0 leaves throttling disabled. | |
1016 | */ | |
1017 | if (state) { | |
1018 | value &= duty_mask; | |
1019 | value |= duty_value; | |
1020 | outl(value, pr->throttling.address); | |
1021 | ||
1022 | value |= 0x00000010; | |
1023 | outl(value, pr->throttling.address); | |
1024 | } | |
1025 | ||
1026 | pr->throttling.state = state; | |
1027 | ||
1028 | local_irq_enable(); | |
1029 | ||
1030 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
1031 | "Throttling state set to T%d (%d%%)\n", state, |
1032 | (pr->throttling.states[state].performance ? pr-> | |
1033 | throttling.states[state].performance / 10 : 0))); | |
1da177e4 | 1034 | |
d550d98d | 1035 | return 0; |
1da177e4 LT |
1036 | } |
1037 | ||
6c5cf8aa | 1038 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
2a908002 | 1039 | int state, bool force) |
01854e69 | 1040 | { |
0753f6e0 | 1041 | int ret; |
439913ff | 1042 | u64 value; |
01854e69 LY |
1043 | |
1044 | if (!pr) | |
1045 | return -EINVAL; | |
1046 | ||
1047 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1048 | return -EINVAL; | |
1049 | ||
1050 | if (!pr->flags.throttling) | |
1051 | return -ENODEV; | |
1052 | ||
2a908002 | 1053 | if (!force && (state == pr->throttling.state)) |
01854e69 LY |
1054 | return 0; |
1055 | ||
1056 | if (state < pr->throttling_platform_limit) | |
1057 | return -EPERM; | |
1058 | ||
0753f6e0 ZY |
1059 | value = 0; |
1060 | ret = acpi_get_throttling_value(pr, state, &value); | |
1061 | if (ret >= 0) { | |
1062 | acpi_write_throttling_state(pr, value); | |
01854e69 LY |
1063 | pr->throttling.state = state; |
1064 | } | |
01854e69 LY |
1065 | |
1066 | return 0; | |
1067 | } | |
1068 | ||
f3ca4164 LT |
1069 | static long acpi_processor_throttling_fn(void *data) |
1070 | { | |
1071 | struct acpi_processor_throttling_arg *arg = data; | |
1072 | struct acpi_processor *pr = arg->pr; | |
1073 | ||
1074 | return pr->throttling.acpi_processor_set_throttling(pr, | |
1075 | arg->target_state, arg->force); | |
1076 | } | |
1077 | ||
2a908002 FP |
1078 | int acpi_processor_set_throttling(struct acpi_processor *pr, |
1079 | int state, bool force) | |
01854e69 | 1080 | { |
3391a76f | 1081 | int ret = 0; |
33a2a529 ZY |
1082 | unsigned int i; |
1083 | struct acpi_processor *match_pr; | |
1084 | struct acpi_processor_throttling *p_throttling; | |
f3ca4164 | 1085 | struct acpi_processor_throttling_arg arg; |
33a2a529 | 1086 | struct throttling_tstate t_state; |
87654273 ZY |
1087 | |
1088 | if (!pr) | |
1089 | return -EINVAL; | |
1090 | ||
1091 | if (!pr->flags.throttling) | |
1092 | return -ENODEV; | |
1093 | ||
1094 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1095 | return -EINVAL; | |
1096 | ||
daef1f35 ZY |
1097 | if (cpu_is_offline(pr->id)) { |
1098 | /* | |
1099 | * the cpu pointed by pr->id is offline. Unnecessary to change | |
1100 | * the throttling state any more. | |
1101 | */ | |
1102 | return -ENODEV; | |
1103 | } | |
1104 | ||
33a2a529 ZY |
1105 | t_state.target_state = state; |
1106 | p_throttling = &(pr->throttling); | |
f3ca4164 | 1107 | |
357dc4c3 | 1108 | /* |
33a2a529 ZY |
1109 | * The throttling notifier will be called for every |
1110 | * affected cpu in order to get one proper T-state. | |
1111 | * The notifier event is THROTTLING_PRECHANGE. | |
357dc4c3 | 1112 | */ |
f3ca4164 | 1113 | for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) { |
33a2a529 ZY |
1114 | t_state.cpu = i; |
1115 | acpi_processor_throttling_notifier(THROTTLING_PRECHANGE, | |
1116 | &t_state); | |
1117 | } | |
1118 | /* | |
1119 | * The function of acpi_processor_set_throttling will be called | |
1120 | * to switch T-state. If the coordination type is SW_ALL or HW_ALL, | |
1121 | * it is necessary to call it for every affected cpu. Otherwise | |
1122 | * it can be called only for the cpu pointed by pr. | |
1123 | */ | |
1124 | if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) { | |
f3ca4164 LT |
1125 | arg.pr = pr; |
1126 | arg.target_state = state; | |
1127 | arg.force = force; | |
1128 | ret = work_on_cpu(pr->id, acpi_processor_throttling_fn, &arg); | |
33a2a529 ZY |
1129 | } else { |
1130 | /* | |
1131 | * When the T-state coordination is SW_ALL or HW_ALL, | |
1132 | * it is necessary to set T-state for every affected | |
1133 | * cpus. | |
1134 | */ | |
f3ca4164 LT |
1135 | for_each_cpu_and(i, cpu_online_mask, |
1136 | p_throttling->shared_cpu_map) { | |
706546d0 | 1137 | match_pr = per_cpu(processors, i); |
33a2a529 ZY |
1138 | /* |
1139 | * If the pointer is invalid, we will report the | |
1140 | * error message and continue. | |
1141 | */ | |
1142 | if (!match_pr) { | |
1143 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1144 | "Invalid Pointer for CPU %d\n", i)); | |
1145 | continue; | |
1146 | } | |
1147 | /* | |
1148 | * If the throttling control is unsupported on CPU i, | |
1149 | * we will report the error message and continue. | |
1150 | */ | |
1151 | if (!match_pr->flags.throttling) { | |
1152 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
25985edc | 1153 | "Throttling Control is unsupported " |
33a2a529 ZY |
1154 | "on CPU %d\n", i)); |
1155 | continue; | |
1156 | } | |
f3ca4164 LT |
1157 | |
1158 | arg.pr = match_pr; | |
1159 | arg.target_state = state; | |
1160 | arg.force = force; | |
1161 | ret = work_on_cpu(pr->id, acpi_processor_throttling_fn, | |
1162 | &arg); | |
33a2a529 ZY |
1163 | } |
1164 | } | |
1165 | /* | |
1166 | * After the set_throttling is called, the | |
1167 | * throttling notifier is called for every | |
1168 | * affected cpu to update the T-states. | |
1169 | * The notifier event is THROTTLING_POSTCHANGE | |
1170 | */ | |
f3ca4164 | 1171 | for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) { |
33a2a529 ZY |
1172 | t_state.cpu = i; |
1173 | acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE, | |
1174 | &t_state); | |
1175 | } | |
f3ca4164 | 1176 | |
357dc4c3 | 1177 | return ret; |
01854e69 LY |
1178 | } |
1179 | ||
4be44fcd | 1180 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
1da177e4 | 1181 | { |
4be44fcd | 1182 | int result = 0; |
1180509f | 1183 | struct acpi_processor_throttling *pthrottling; |
1da177e4 | 1184 | |
1da177e4 | 1185 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
1186 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
1187 | pr->throttling.address, | |
1188 | pr->throttling.duty_offset, | |
1189 | pr->throttling.duty_width)); | |
1da177e4 | 1190 | |
c30c620e LB |
1191 | /* |
1192 | * Evaluate _PTC, _TSS and _TPC | |
1193 | * They must all be present or none of them can be used. | |
1194 | */ | |
1195 | if (acpi_processor_get_throttling_control(pr) || | |
1196 | acpi_processor_get_throttling_states(pr) || | |
1197 | acpi_processor_get_platform_limit(pr)) | |
1198 | { | |
ff55a9ce LB |
1199 | pr->throttling.acpi_processor_get_throttling = |
1200 | &acpi_processor_get_throttling_fadt; | |
1201 | pr->throttling.acpi_processor_set_throttling = | |
1202 | &acpi_processor_set_throttling_fadt; | |
d1154be3 AS |
1203 | if (acpi_processor_get_fadt_info(pr)) |
1204 | return 0; | |
01854e69 | 1205 | } else { |
ff55a9ce LB |
1206 | pr->throttling.acpi_processor_get_throttling = |
1207 | &acpi_processor_get_throttling_ptc; | |
1208 | pr->throttling.acpi_processor_set_throttling = | |
1209 | &acpi_processor_set_throttling_ptc; | |
01854e69 | 1210 | } |
1da177e4 | 1211 | |
1180509f ZY |
1212 | /* |
1213 | * If TSD package for one CPU can't be parsed successfully, it means | |
1214 | * that this CPU will have no coordination with other CPUs. | |
1215 | */ | |
1216 | if (acpi_processor_get_tsd(pr)) { | |
1217 | pthrottling = &pr->throttling; | |
1218 | pthrottling->tsd_valid_flag = 0; | |
2fdf66b4 | 1219 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
1220 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
1221 | } | |
c30c620e | 1222 | |
1da177e4 LT |
1223 | /* |
1224 | * PIIX4 Errata: We don't support throttling on the original PIIX4. | |
1225 | * This shouldn't be an issue as few (if any) mobile systems ever | |
1226 | * used this part. | |
1227 | */ | |
1228 | if (errata.piix4.throttle) { | |
1229 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 1230 | "Throttling not supported on PIIX4 A- or B-step\n")); |
d550d98d | 1231 | return 0; |
1da177e4 LT |
1232 | } |
1233 | ||
1da177e4 | 1234 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
4be44fcd | 1235 | pr->throttling.state_count)); |
1da177e4 LT |
1236 | |
1237 | pr->flags.throttling = 1; | |
1238 | ||
1239 | /* | |
1240 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. | |
1241 | * thermal) decide to lower performance if it so chooses, but for now | |
1242 | * we'll crank up the speed. | |
1243 | */ | |
1244 | ||
1245 | result = acpi_processor_get_throttling(pr); | |
1246 | if (result) | |
1247 | goto end; | |
1248 | ||
1249 | if (pr->throttling.state) { | |
4be44fcd LB |
1250 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1251 | "Disabling throttling (was T%d)\n", | |
1252 | pr->throttling.state)); | |
2a908002 | 1253 | result = acpi_processor_set_throttling(pr, 0, false); |
1da177e4 LT |
1254 | if (result) |
1255 | goto end; | |
1256 | } | |
1257 | ||
4be44fcd | 1258 | end: |
1da177e4 LT |
1259 | if (result) |
1260 | pr->flags.throttling = 0; | |
1261 | ||
d550d98d | 1262 | return result; |
1da177e4 LT |
1263 | } |
1264 |