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 | * | |
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> |
1da177e4 LT |
35 | |
36 | #include <asm/io.h> | |
37 | #include <asm/uaccess.h> | |
38 | ||
39 | #include <acpi/acpi_bus.h> | |
89595b8f | 40 | #include <acpi/acpi_drivers.h> |
1da177e4 LT |
41 | #include <acpi/processor.h> |
42 | ||
a192a958 LB |
43 | #define PREFIX "ACPI: " |
44 | ||
1da177e4 | 45 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 | 46 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
f52fd66d | 47 | ACPI_MODULE_NAME("processor_throttling"); |
1da177e4 | 48 | |
56c213fa ZR |
49 | /* ignore_tpc: |
50 | * 0 -> acpi processor driver doesn't ignore _TPC values | |
51 | * 1 -> acpi processor driver ignores _TPC values | |
52 | */ | |
53 | static int ignore_tpc; | |
54 | module_param(ignore_tpc, int, 0644); | |
55 | MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support"); | |
56 | ||
e4aa5cb2 ZY |
57 | struct throttling_tstate { |
58 | unsigned int cpu; /* cpu nr */ | |
59 | int target_state; /* target T-state */ | |
60 | }; | |
61 | ||
44ae49aa LT |
62 | struct acpi_processor_throttling_arg { |
63 | struct acpi_processor *pr; | |
64 | int target_state; | |
65 | bool force; | |
66 | }; | |
67 | ||
e4aa5cb2 ZY |
68 | #define THROTTLING_PRECHANGE (1) |
69 | #define THROTTLING_POSTCHANGE (2) | |
70 | ||
ff55a9ce | 71 | static int acpi_processor_get_throttling(struct acpi_processor *pr); |
2a908002 FP |
72 | int acpi_processor_set_throttling(struct acpi_processor *pr, |
73 | int state, bool force); | |
01854e69 | 74 | |
1180509f ZY |
75 | static int acpi_processor_update_tsd_coord(void) |
76 | { | |
77 | int count, count_target; | |
78 | int retval = 0; | |
79 | unsigned int i, j; | |
2fdf66b4 | 80 | cpumask_var_t covered_cpus; |
1180509f ZY |
81 | struct acpi_processor *pr, *match_pr; |
82 | struct acpi_tsd_package *pdomain, *match_pdomain; | |
83 | struct acpi_processor_throttling *pthrottling, *match_pthrottling; | |
84 | ||
79f55997 | 85 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
86 | return -ENOMEM; |
87 | ||
1180509f ZY |
88 | /* |
89 | * Now that we have _TSD data from all CPUs, lets setup T-state | |
33a2a529 | 90 | * coordination between all CPUs. |
1180509f ZY |
91 | */ |
92 | for_each_possible_cpu(i) { | |
706546d0 | 93 | pr = per_cpu(processors, i); |
1180509f ZY |
94 | if (!pr) |
95 | continue; | |
96 | ||
97 | /* Basic validity check for domain info */ | |
98 | pthrottling = &(pr->throttling); | |
99 | ||
100 | /* | |
101 | * If tsd package for one cpu is invalid, the coordination | |
102 | * among all CPUs is thought as invalid. | |
103 | * Maybe it is ugly. | |
104 | */ | |
105 | if (!pthrottling->tsd_valid_flag) { | |
106 | retval = -EINVAL; | |
107 | break; | |
108 | } | |
109 | } | |
110 | if (retval) | |
111 | goto err_ret; | |
112 | ||
1180509f | 113 | for_each_possible_cpu(i) { |
706546d0 | 114 | pr = per_cpu(processors, i); |
1180509f ZY |
115 | if (!pr) |
116 | continue; | |
117 | ||
2fdf66b4 | 118 | if (cpumask_test_cpu(i, covered_cpus)) |
1180509f ZY |
119 | continue; |
120 | pthrottling = &pr->throttling; | |
121 | ||
122 | pdomain = &(pthrottling->domain_info); | |
2fdf66b4 RR |
123 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); |
124 | cpumask_set_cpu(i, covered_cpus); | |
1180509f ZY |
125 | /* |
126 | * If the number of processor in the TSD domain is 1, it is | |
127 | * unnecessary to parse the coordination for this CPU. | |
128 | */ | |
129 | if (pdomain->num_processors <= 1) | |
130 | continue; | |
131 | ||
132 | /* Validate the Domain info */ | |
133 | count_target = pdomain->num_processors; | |
134 | count = 1; | |
135 | ||
136 | for_each_possible_cpu(j) { | |
137 | if (i == j) | |
138 | continue; | |
139 | ||
706546d0 | 140 | match_pr = per_cpu(processors, j); |
1180509f ZY |
141 | if (!match_pr) |
142 | continue; | |
143 | ||
144 | match_pthrottling = &(match_pr->throttling); | |
145 | match_pdomain = &(match_pthrottling->domain_info); | |
146 | if (match_pdomain->domain != pdomain->domain) | |
147 | continue; | |
148 | ||
149 | /* Here i and j are in the same domain. | |
150 | * If two TSD packages have the same domain, they | |
151 | * should have the same num_porcessors and | |
152 | * coordination type. Otherwise it will be regarded | |
153 | * as illegal. | |
154 | */ | |
155 | if (match_pdomain->num_processors != count_target) { | |
156 | retval = -EINVAL; | |
157 | goto err_ret; | |
158 | } | |
159 | ||
160 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
161 | retval = -EINVAL; | |
162 | goto err_ret; | |
163 | } | |
164 | ||
2fdf66b4 RR |
165 | cpumask_set_cpu(j, covered_cpus); |
166 | cpumask_set_cpu(j, pthrottling->shared_cpu_map); | |
1180509f ZY |
167 | count++; |
168 | } | |
169 | for_each_possible_cpu(j) { | |
170 | if (i == j) | |
171 | continue; | |
172 | ||
706546d0 | 173 | match_pr = per_cpu(processors, j); |
1180509f ZY |
174 | if (!match_pr) |
175 | continue; | |
176 | ||
177 | match_pthrottling = &(match_pr->throttling); | |
178 | match_pdomain = &(match_pthrottling->domain_info); | |
179 | if (match_pdomain->domain != pdomain->domain) | |
180 | continue; | |
181 | ||
182 | /* | |
183 | * If some CPUS have the same domain, they | |
184 | * will have the same shared_cpu_map. | |
185 | */ | |
2fdf66b4 RR |
186 | cpumask_copy(match_pthrottling->shared_cpu_map, |
187 | pthrottling->shared_cpu_map); | |
1180509f ZY |
188 | } |
189 | } | |
190 | ||
191 | err_ret: | |
2fdf66b4 RR |
192 | free_cpumask_var(covered_cpus); |
193 | ||
1180509f | 194 | for_each_possible_cpu(i) { |
706546d0 | 195 | pr = per_cpu(processors, i); |
1180509f ZY |
196 | if (!pr) |
197 | continue; | |
198 | ||
199 | /* | |
200 | * Assume no coordination on any error parsing domain info. | |
201 | * The coordination type will be forced as SW_ALL. | |
202 | */ | |
203 | if (retval) { | |
204 | pthrottling = &(pr->throttling); | |
2fdf66b4 RR |
205 | cpumask_clear(pthrottling->shared_cpu_map); |
206 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); | |
1180509f ZY |
207 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
208 | } | |
209 | } | |
210 | ||
211 | return retval; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Update the T-state coordination after the _TSD | |
216 | * data for all cpus is obtained. | |
217 | */ | |
218 | void acpi_processor_throttling_init(void) | |
219 | { | |
2d5914cc | 220 | if (acpi_processor_update_tsd_coord()) { |
1180509f ZY |
221 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
222 | "Assume no T-state coordination\n")); | |
2d5914cc | 223 | } |
1180509f ZY |
224 | |
225 | return; | |
226 | } | |
227 | ||
e4aa5cb2 ZY |
228 | static int acpi_processor_throttling_notifier(unsigned long event, void *data) |
229 | { | |
230 | struct throttling_tstate *p_tstate = data; | |
231 | struct acpi_processor *pr; | |
232 | unsigned int cpu ; | |
233 | int target_state; | |
234 | struct acpi_processor_limit *p_limit; | |
235 | struct acpi_processor_throttling *p_throttling; | |
236 | ||
237 | cpu = p_tstate->cpu; | |
706546d0 | 238 | pr = per_cpu(processors, cpu); |
e4aa5cb2 ZY |
239 | if (!pr) { |
240 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n")); | |
241 | return 0; | |
242 | } | |
243 | if (!pr->flags.throttling) { | |
244 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is " | |
245 | "unsupported on CPU %d\n", cpu)); | |
246 | return 0; | |
247 | } | |
248 | target_state = p_tstate->target_state; | |
249 | p_throttling = &(pr->throttling); | |
250 | switch (event) { | |
251 | case THROTTLING_PRECHANGE: | |
252 | /* | |
253 | * Prechange event is used to choose one proper t-state, | |
254 | * which meets the limits of thermal, user and _TPC. | |
255 | */ | |
256 | p_limit = &pr->limit; | |
257 | if (p_limit->thermal.tx > target_state) | |
258 | target_state = p_limit->thermal.tx; | |
259 | if (p_limit->user.tx > target_state) | |
260 | target_state = p_limit->user.tx; | |
261 | if (pr->throttling_platform_limit > target_state) | |
262 | target_state = pr->throttling_platform_limit; | |
263 | if (target_state >= p_throttling->state_count) { | |
264 | printk(KERN_WARNING | |
265 | "Exceed the limit of T-state \n"); | |
266 | target_state = p_throttling->state_count - 1; | |
267 | } | |
268 | p_tstate->target_state = target_state; | |
269 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:" | |
270 | "target T-state of CPU %d is T%d\n", | |
271 | cpu, target_state)); | |
272 | break; | |
273 | case THROTTLING_POSTCHANGE: | |
274 | /* | |
275 | * Postchange event is only used to update the | |
276 | * T-state flag of acpi_processor_throttling. | |
277 | */ | |
278 | p_throttling->state = target_state; | |
279 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:" | |
280 | "CPU %d is switched to T%d\n", | |
281 | cpu, target_state)); | |
282 | break; | |
283 | default: | |
284 | printk(KERN_WARNING | |
285 | "Unsupported Throttling notifier event\n"); | |
286 | break; | |
287 | } | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
c30c620e LB |
292 | /* |
293 | * _TPC - Throttling Present Capabilities | |
294 | */ | |
01854e69 LY |
295 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
296 | { | |
297 | acpi_status status = 0; | |
27663c58 | 298 | unsigned long long tpc = 0; |
01854e69 | 299 | |
ff55a9ce | 300 | if (!pr) |
01854e69 | 301 | return -EINVAL; |
56c213fa ZR |
302 | |
303 | if (ignore_tpc) | |
304 | goto end; | |
305 | ||
01854e69 | 306 | status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); |
c30c620e LB |
307 | if (ACPI_FAILURE(status)) { |
308 | if (status != AE_NOT_FOUND) { | |
309 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC")); | |
310 | } | |
01854e69 LY |
311 | return -ENODEV; |
312 | } | |
56c213fa ZR |
313 | |
314 | end: | |
01854e69 LY |
315 | pr->throttling_platform_limit = (int)tpc; |
316 | return 0; | |
317 | } | |
318 | ||
319 | int acpi_processor_tstate_has_changed(struct acpi_processor *pr) | |
320 | { | |
ef54d5ad ZY |
321 | int result = 0; |
322 | int throttling_limit; | |
323 | int current_state; | |
324 | struct acpi_processor_limit *limit; | |
325 | int target_state; | |
326 | ||
56c213fa ZR |
327 | if (ignore_tpc) |
328 | return 0; | |
329 | ||
ef54d5ad ZY |
330 | result = acpi_processor_get_platform_limit(pr); |
331 | if (result) { | |
332 | /* Throttling Limit is unsupported */ | |
333 | return result; | |
334 | } | |
335 | ||
336 | throttling_limit = pr->throttling_platform_limit; | |
337 | if (throttling_limit >= pr->throttling.state_count) { | |
338 | /* Uncorrect Throttling Limit */ | |
339 | return -EINVAL; | |
340 | } | |
341 | ||
342 | current_state = pr->throttling.state; | |
343 | if (current_state > throttling_limit) { | |
344 | /* | |
345 | * The current state can meet the requirement of | |
346 | * _TPC limit. But it is reasonable that OSPM changes | |
347 | * t-states from high to low for better performance. | |
348 | * Of course the limit condition of thermal | |
349 | * and user should be considered. | |
350 | */ | |
351 | limit = &pr->limit; | |
352 | target_state = throttling_limit; | |
353 | if (limit->thermal.tx > target_state) | |
354 | target_state = limit->thermal.tx; | |
355 | if (limit->user.tx > target_state) | |
356 | target_state = limit->user.tx; | |
357 | } else if (current_state == throttling_limit) { | |
358 | /* | |
359 | * Unnecessary to change the throttling state | |
360 | */ | |
361 | return 0; | |
362 | } else { | |
363 | /* | |
364 | * If the current state is lower than the limit of _TPC, it | |
365 | * will be forced to switch to the throttling state defined | |
366 | * by throttling_platfor_limit. | |
367 | * Because the previous state meets with the limit condition | |
368 | * of thermal and user, it is unnecessary to check it again. | |
369 | */ | |
370 | target_state = throttling_limit; | |
371 | } | |
2a908002 | 372 | return acpi_processor_set_throttling(pr, target_state, false); |
01854e69 LY |
373 | } |
374 | ||
5a344a50 ZY |
375 | /* |
376 | * This function is used to reevaluate whether the T-state is valid | |
377 | * after one CPU is onlined/offlined. | |
378 | * It is noted that it won't reevaluate the following properties for | |
379 | * the T-state. | |
380 | * 1. Control method. | |
381 | * 2. the number of supported T-state | |
382 | * 3. TSD domain | |
383 | */ | |
384 | void acpi_processor_reevaluate_tstate(struct acpi_processor *pr, | |
385 | unsigned long action) | |
386 | { | |
387 | int result = 0; | |
388 | ||
389 | if (action == CPU_DEAD) { | |
390 | /* When one CPU is offline, the T-state throttling | |
391 | * will be invalidated. | |
392 | */ | |
393 | pr->flags.throttling = 0; | |
394 | return; | |
395 | } | |
396 | /* the following is to recheck whether the T-state is valid for | |
397 | * the online CPU | |
398 | */ | |
399 | if (!pr->throttling.state_count) { | |
400 | /* If the number of T-state is invalid, it is | |
401 | * invalidated. | |
402 | */ | |
403 | pr->flags.throttling = 0; | |
404 | return; | |
405 | } | |
406 | pr->flags.throttling = 1; | |
407 | ||
408 | /* Disable throttling (if enabled). We'll let subsequent | |
409 | * policy (e.g.thermal) decide to lower performance if it | |
410 | * so chooses, but for now we'll crank up the speed. | |
411 | */ | |
412 | ||
413 | result = acpi_processor_get_throttling(pr); | |
414 | if (result) | |
415 | goto end; | |
416 | ||
417 | if (pr->throttling.state) { | |
418 | result = acpi_processor_set_throttling(pr, 0, false); | |
419 | if (result) | |
420 | goto end; | |
421 | } | |
422 | ||
423 | end: | |
424 | if (result) | |
425 | pr->flags.throttling = 0; | |
426 | } | |
c30c620e LB |
427 | /* |
428 | * _PTC - Processor Throttling Control (and status) register location | |
429 | */ | |
01854e69 LY |
430 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) |
431 | { | |
432 | int result = 0; | |
433 | acpi_status status = 0; | |
434 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
435 | union acpi_object *ptc = NULL; | |
436 | union acpi_object obj = { 0 }; | |
9bcb2721 | 437 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
438 | |
439 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); | |
440 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
441 | if (status != AE_NOT_FOUND) { |
442 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); | |
443 | } | |
01854e69 LY |
444 | return -ENODEV; |
445 | } | |
446 | ||
447 | ptc = (union acpi_object *)buffer.pointer; | |
448 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) | |
449 | || (ptc->package.count != 2)) { | |
450 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); | |
451 | result = -EFAULT; | |
452 | goto end; | |
453 | } | |
454 | ||
455 | /* | |
456 | * control_register | |
457 | */ | |
458 | ||
459 | obj = ptc->package.elements[0]; | |
460 | ||
461 | if ((obj.type != ACPI_TYPE_BUFFER) | |
462 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
463 | || (obj.buffer.pointer == NULL)) { | |
ff55a9ce LB |
464 | printk(KERN_ERR PREFIX |
465 | "Invalid _PTC data (control_register)\n"); | |
01854e69 LY |
466 | result = -EFAULT; |
467 | goto end; | |
468 | } | |
469 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, | |
470 | sizeof(struct acpi_ptc_register)); | |
471 | ||
472 | /* | |
473 | * status_register | |
474 | */ | |
475 | ||
476 | obj = ptc->package.elements[1]; | |
477 | ||
478 | if ((obj.type != ACPI_TYPE_BUFFER) | |
479 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
480 | || (obj.buffer.pointer == NULL)) { | |
481 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); | |
482 | result = -EFAULT; | |
483 | goto end; | |
484 | } | |
485 | ||
486 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, | |
ff55a9ce | 487 | sizeof(struct acpi_ptc_register)); |
01854e69 | 488 | |
9bcb2721 ZY |
489 | throttling = &pr->throttling; |
490 | ||
491 | if ((throttling->control_register.bit_width + | |
492 | throttling->control_register.bit_offset) > 32) { | |
493 | printk(KERN_ERR PREFIX "Invalid _PTC control register\n"); | |
494 | result = -EFAULT; | |
495 | goto end; | |
496 | } | |
497 | ||
498 | if ((throttling->status_register.bit_width + | |
499 | throttling->status_register.bit_offset) > 32) { | |
500 | printk(KERN_ERR PREFIX "Invalid _PTC status register\n"); | |
501 | result = -EFAULT; | |
502 | goto end; | |
503 | } | |
504 | ||
ff55a9ce | 505 | end: |
01854e69 LY |
506 | kfree(buffer.pointer); |
507 | ||
508 | return result; | |
509 | } | |
c30c620e LB |
510 | |
511 | /* | |
512 | * _TSS - Throttling Supported States | |
513 | */ | |
01854e69 LY |
514 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) |
515 | { | |
516 | int result = 0; | |
517 | acpi_status status = AE_OK; | |
518 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
519 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
520 | struct acpi_buffer state = { 0, NULL }; | |
521 | union acpi_object *tss = NULL; | |
522 | int i; | |
523 | ||
524 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); | |
525 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
526 | if (status != AE_NOT_FOUND) { |
527 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); | |
528 | } | |
01854e69 LY |
529 | return -ENODEV; |
530 | } | |
531 | ||
532 | tss = buffer.pointer; | |
533 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { | |
534 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); | |
535 | result = -EFAULT; | |
536 | goto end; | |
537 | } | |
538 | ||
539 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
540 | tss->package.count)); | |
541 | ||
542 | pr->throttling.state_count = tss->package.count; | |
543 | pr->throttling.states_tss = | |
544 | kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count, | |
545 | GFP_KERNEL); | |
546 | if (!pr->throttling.states_tss) { | |
547 | result = -ENOMEM; | |
548 | goto end; | |
549 | } | |
550 | ||
551 | for (i = 0; i < pr->throttling.state_count; i++) { | |
552 | ||
ff55a9ce LB |
553 | struct acpi_processor_tx_tss *tx = |
554 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
555 | states_tss[i]); | |
01854e69 LY |
556 | |
557 | state.length = sizeof(struct acpi_processor_tx_tss); | |
558 | state.pointer = tx; | |
559 | ||
560 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
561 | ||
562 | status = acpi_extract_package(&(tss->package.elements[i]), | |
563 | &format, &state); | |
564 | if (ACPI_FAILURE(status)) { | |
565 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); | |
566 | result = -EFAULT; | |
567 | kfree(pr->throttling.states_tss); | |
568 | goto end; | |
569 | } | |
570 | ||
571 | if (!tx->freqpercentage) { | |
572 | printk(KERN_ERR PREFIX | |
ff55a9ce | 573 | "Invalid _TSS data: freq is zero\n"); |
01854e69 LY |
574 | result = -EFAULT; |
575 | kfree(pr->throttling.states_tss); | |
576 | goto end; | |
577 | } | |
578 | } | |
579 | ||
580 | end: | |
581 | kfree(buffer.pointer); | |
582 | ||
583 | return result; | |
584 | } | |
c30c620e LB |
585 | |
586 | /* | |
587 | * _TSD - T-State Dependencies | |
588 | */ | |
ff55a9ce | 589 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
01854e69 LY |
590 | { |
591 | int result = 0; | |
592 | acpi_status status = AE_OK; | |
ff55a9ce LB |
593 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
594 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
595 | struct acpi_buffer state = { 0, NULL }; | |
596 | union acpi_object *tsd = NULL; | |
01854e69 | 597 | struct acpi_tsd_package *pdomain; |
1180509f ZY |
598 | struct acpi_processor_throttling *pthrottling; |
599 | ||
600 | pthrottling = &pr->throttling; | |
601 | pthrottling->tsd_valid_flag = 0; | |
01854e69 LY |
602 | |
603 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); | |
604 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
605 | if (status != AE_NOT_FOUND) { |
606 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD")); | |
607 | } | |
01854e69 LY |
608 | return -ENODEV; |
609 | } | |
610 | ||
611 | tsd = buffer.pointer; | |
612 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { | |
55ac9a01 | 613 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
614 | result = -EFAULT; |
615 | goto end; | |
616 | } | |
617 | ||
618 | if (tsd->package.count != 1) { | |
55ac9a01 | 619 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
620 | result = -EFAULT; |
621 | goto end; | |
622 | } | |
623 | ||
624 | pdomain = &(pr->throttling.domain_info); | |
625 | ||
626 | state.length = sizeof(struct acpi_tsd_package); | |
627 | state.pointer = pdomain; | |
628 | ||
629 | status = acpi_extract_package(&(tsd->package.elements[0]), | |
ff55a9ce | 630 | &format, &state); |
01854e69 | 631 | if (ACPI_FAILURE(status)) { |
55ac9a01 | 632 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
633 | result = -EFAULT; |
634 | goto end; | |
635 | } | |
636 | ||
637 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { | |
55ac9a01 | 638 | printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n"); |
01854e69 LY |
639 | result = -EFAULT; |
640 | goto end; | |
641 | } | |
642 | ||
643 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { | |
55ac9a01 | 644 | printk(KERN_ERR PREFIX "Unknown _TSD:revision\n"); |
01854e69 LY |
645 | result = -EFAULT; |
646 | goto end; | |
647 | } | |
648 | ||
1180509f ZY |
649 | pthrottling = &pr->throttling; |
650 | pthrottling->tsd_valid_flag = 1; | |
651 | pthrottling->shared_type = pdomain->coord_type; | |
2fdf66b4 | 652 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
653 | /* |
654 | * If the coordination type is not defined in ACPI spec, | |
655 | * the tsd_valid_flag will be clear and coordination type | |
656 | * will be forecd as DOMAIN_COORD_TYPE_SW_ALL. | |
657 | */ | |
658 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
659 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
660 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
661 | pthrottling->tsd_valid_flag = 0; | |
662 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; | |
663 | } | |
664 | ||
ff55a9ce | 665 | end: |
01854e69 LY |
666 | kfree(buffer.pointer); |
667 | return result; | |
668 | } | |
669 | ||
1da177e4 LT |
670 | /* -------------------------------------------------------------------------- |
671 | Throttling Control | |
672 | -------------------------------------------------------------------------- */ | |
01854e69 | 673 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
1da177e4 | 674 | { |
4be44fcd LB |
675 | int state = 0; |
676 | u32 value = 0; | |
677 | u32 duty_mask = 0; | |
678 | u32 duty_value = 0; | |
1da177e4 | 679 | |
1da177e4 | 680 | if (!pr) |
d550d98d | 681 | return -EINVAL; |
1da177e4 LT |
682 | |
683 | if (!pr->flags.throttling) | |
d550d98d | 684 | return -ENODEV; |
1da177e4 LT |
685 | |
686 | pr->throttling.state = 0; | |
687 | ||
688 | duty_mask = pr->throttling.state_count - 1; | |
689 | ||
690 | duty_mask <<= pr->throttling.duty_offset; | |
691 | ||
692 | local_irq_disable(); | |
693 | ||
694 | value = inl(pr->throttling.address); | |
695 | ||
696 | /* | |
697 | * Compute the current throttling state when throttling is enabled | |
698 | * (bit 4 is on). | |
699 | */ | |
700 | if (value & 0x10) { | |
701 | duty_value = value & duty_mask; | |
702 | duty_value >>= pr->throttling.duty_offset; | |
703 | ||
704 | if (duty_value) | |
4be44fcd | 705 | state = pr->throttling.state_count - duty_value; |
1da177e4 LT |
706 | } |
707 | ||
708 | pr->throttling.state = state; | |
709 | ||
710 | local_irq_enable(); | |
711 | ||
712 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
713 | "Throttling state is T%d (%d%% throttling applied)\n", |
714 | state, pr->throttling.states[state].performance)); | |
1da177e4 | 715 | |
d550d98d | 716 | return 0; |
1da177e4 LT |
717 | } |
718 | ||
f79f06ab | 719 | #ifdef CONFIG_X86 |
9d42a53e | 720 | static int acpi_throttling_rdmsr(u64 *value) |
f79f06ab | 721 | { |
f79f06ab | 722 | u64 msr_high, msr_low; |
f79f06ab ZY |
723 | u64 msr = 0; |
724 | int ret = -1; | |
725 | ||
9d42a53e CL |
726 | if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) || |
727 | !this_cpu_has(X86_FEATURE_ACPI)) { | |
f79f06ab ZY |
728 | printk(KERN_ERR PREFIX |
729 | "HARDWARE addr space,NOT supported yet\n"); | |
730 | } else { | |
731 | msr_low = 0; | |
732 | msr_high = 0; | |
357dc4c3 | 733 | rdmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
734 | (u32 *)&msr_low , (u32 *) &msr_high); |
735 | msr = (msr_high << 32) | msr_low; | |
439913ff | 736 | *value = (u64) msr; |
f79f06ab ZY |
737 | ret = 0; |
738 | } | |
739 | return ret; | |
740 | } | |
741 | ||
9d42a53e | 742 | static int acpi_throttling_wrmsr(u64 value) |
f79f06ab | 743 | { |
f79f06ab ZY |
744 | int ret = -1; |
745 | u64 msr; | |
746 | ||
9d42a53e CL |
747 | if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) || |
748 | !this_cpu_has(X86_FEATURE_ACPI)) { | |
f79f06ab ZY |
749 | printk(KERN_ERR PREFIX |
750 | "HARDWARE addr space,NOT supported yet\n"); | |
751 | } else { | |
752 | msr = value; | |
357dc4c3 | 753 | wrmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
754 | msr & 0xffffffff, msr >> 32); |
755 | ret = 0; | |
756 | } | |
757 | return ret; | |
758 | } | |
759 | #else | |
9d42a53e | 760 | static int acpi_throttling_rdmsr(u64 *value) |
f79f06ab ZY |
761 | { |
762 | printk(KERN_ERR PREFIX | |
763 | "HARDWARE addr space,NOT supported yet\n"); | |
764 | return -1; | |
765 | } | |
766 | ||
9d42a53e | 767 | static int acpi_throttling_wrmsr(u64 value) |
f79f06ab ZY |
768 | { |
769 | printk(KERN_ERR PREFIX | |
770 | "HARDWARE addr space,NOT supported yet\n"); | |
771 | return -1; | |
772 | } | |
773 | #endif | |
774 | ||
0753f6e0 | 775 | static int acpi_read_throttling_status(struct acpi_processor *pr, |
439913ff | 776 | u64 *value) |
01854e69 | 777 | { |
9bcb2721 | 778 | u32 bit_width, bit_offset; |
344e222e | 779 | u32 ptc_value; |
9bcb2721 | 780 | u64 ptc_mask; |
0753f6e0 ZY |
781 | struct acpi_processor_throttling *throttling; |
782 | int ret = -1; | |
783 | ||
784 | throttling = &pr->throttling; | |
01854e69 LY |
785 | switch (throttling->status_register.space_id) { |
786 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
787 | bit_width = throttling->status_register.bit_width; |
788 | bit_offset = throttling->status_register.bit_offset; | |
789 | ||
ff55a9ce | 790 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
344e222e | 791 | address, &ptc_value, |
9bcb2721 ZY |
792 | (u32) (bit_width + bit_offset)); |
793 | ptc_mask = (1 << bit_width) - 1; | |
439913ff | 794 | *value = (u64) ((ptc_value >> bit_offset) & ptc_mask); |
0753f6e0 | 795 | ret = 0; |
01854e69 LY |
796 | break; |
797 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
9d42a53e | 798 | ret = acpi_throttling_rdmsr(value); |
01854e69 LY |
799 | break; |
800 | default: | |
801 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 802 | (u32) (throttling->status_register.space_id)); |
01854e69 | 803 | } |
0753f6e0 | 804 | return ret; |
01854e69 LY |
805 | } |
806 | ||
0753f6e0 | 807 | static int acpi_write_throttling_state(struct acpi_processor *pr, |
439913ff | 808 | u64 value) |
01854e69 | 809 | { |
9bcb2721 | 810 | u32 bit_width, bit_offset; |
0753f6e0 | 811 | u64 ptc_value; |
9bcb2721 | 812 | u64 ptc_mask; |
0753f6e0 | 813 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
814 | int ret = -1; |
815 | ||
0753f6e0 | 816 | throttling = &pr->throttling; |
01854e69 LY |
817 | switch (throttling->control_register.space_id) { |
818 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
819 | bit_width = throttling->control_register.bit_width; |
820 | bit_offset = throttling->control_register.bit_offset; | |
821 | ptc_mask = (1 << bit_width) - 1; | |
822 | ptc_value = value & ptc_mask; | |
823 | ||
ff55a9ce | 824 | acpi_os_write_port((acpi_io_address) throttling-> |
9bcb2721 ZY |
825 | control_register.address, |
826 | (u32) (ptc_value << bit_offset), | |
827 | (u32) (bit_width + bit_offset)); | |
01854e69 LY |
828 | ret = 0; |
829 | break; | |
830 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
9d42a53e | 831 | ret = acpi_throttling_wrmsr(value); |
01854e69 LY |
832 | break; |
833 | default: | |
834 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 835 | (u32) (throttling->control_register.space_id)); |
01854e69 LY |
836 | } |
837 | return ret; | |
838 | } | |
839 | ||
0753f6e0 | 840 | static int acpi_get_throttling_state(struct acpi_processor *pr, |
439913ff | 841 | u64 value) |
01854e69 LY |
842 | { |
843 | int i; | |
844 | ||
845 | for (i = 0; i < pr->throttling.state_count; i++) { | |
ff55a9ce LB |
846 | struct acpi_processor_tx_tss *tx = |
847 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
848 | states_tss[i]); | |
849 | if (tx->control == value) | |
53af9cfb | 850 | return i; |
01854e69 | 851 | } |
53af9cfb | 852 | return -1; |
01854e69 LY |
853 | } |
854 | ||
0753f6e0 | 855 | static int acpi_get_throttling_value(struct acpi_processor *pr, |
439913ff | 856 | int state, u64 *value) |
01854e69 | 857 | { |
0753f6e0 ZY |
858 | int ret = -1; |
859 | ||
ff55a9ce LB |
860 | if (state >= 0 && state <= pr->throttling.state_count) { |
861 | struct acpi_processor_tx_tss *tx = | |
862 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
863 | states_tss[state]); | |
0753f6e0 ZY |
864 | *value = tx->control; |
865 | ret = 0; | |
01854e69 | 866 | } |
0753f6e0 | 867 | return ret; |
01854e69 LY |
868 | } |
869 | ||
870 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) | |
871 | { | |
872 | int state = 0; | |
0753f6e0 | 873 | int ret; |
439913ff | 874 | u64 value; |
01854e69 | 875 | |
01854e69 LY |
876 | if (!pr) |
877 | return -EINVAL; | |
878 | ||
879 | if (!pr->flags.throttling) | |
880 | return -ENODEV; | |
881 | ||
882 | pr->throttling.state = 0; | |
357dc4c3 | 883 | |
0753f6e0 ZY |
884 | value = 0; |
885 | ret = acpi_read_throttling_status(pr, &value); | |
886 | if (ret >= 0) { | |
ff55a9ce | 887 | state = acpi_get_throttling_state(pr, value); |
4973b22a | 888 | if (state == -1) { |
bdf57de4 FP |
889 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
890 | "Invalid throttling state, reset\n")); | |
4973b22a | 891 | state = 0; |
2a908002 | 892 | ret = acpi_processor_set_throttling(pr, state, true); |
4973b22a ZR |
893 | if (ret) |
894 | return ret; | |
895 | } | |
01854e69 LY |
896 | pr->throttling.state = state; |
897 | } | |
01854e69 LY |
898 | |
899 | return 0; | |
900 | } | |
901 | ||
01854e69 LY |
902 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
903 | { | |
2fdf66b4 | 904 | cpumask_var_t saved_mask; |
357dc4c3 ZY |
905 | int ret; |
906 | ||
87654273 ZY |
907 | if (!pr) |
908 | return -EINVAL; | |
909 | ||
910 | if (!pr->flags.throttling) | |
911 | return -ENODEV; | |
2fdf66b4 RR |
912 | |
913 | if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL)) | |
914 | return -ENOMEM; | |
915 | ||
357dc4c3 ZY |
916 | /* |
917 | * Migrate task to the cpu pointed by pr. | |
918 | */ | |
2fdf66b4 RR |
919 | cpumask_copy(saved_mask, ¤t->cpus_allowed); |
920 | /* FIXME: use work_on_cpu() */ | |
daef1f35 ZY |
921 | if (set_cpus_allowed_ptr(current, cpumask_of(pr->id))) { |
922 | /* Can't migrate to the target pr->id CPU. Exit */ | |
923 | free_cpumask_var(saved_mask); | |
924 | return -ENODEV; | |
925 | } | |
357dc4c3 ZY |
926 | ret = pr->throttling.acpi_processor_get_throttling(pr); |
927 | /* restore the previous state */ | |
2fdf66b4 RR |
928 | set_cpus_allowed_ptr(current, saved_mask); |
929 | free_cpumask_var(saved_mask); | |
357dc4c3 ZY |
930 | |
931 | return ret; | |
01854e69 LY |
932 | } |
933 | ||
22cc5019 ZY |
934 | static int acpi_processor_get_fadt_info(struct acpi_processor *pr) |
935 | { | |
936 | int i, step; | |
937 | ||
938 | if (!pr->throttling.address) { | |
939 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); | |
940 | return -EINVAL; | |
941 | } else if (!pr->throttling.duty_width) { | |
942 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); | |
943 | return -EINVAL; | |
944 | } | |
945 | /* TBD: Support duty_cycle values that span bit 4. */ | |
946 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { | |
947 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); | |
948 | return -EINVAL; | |
949 | } | |
950 | ||
951 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; | |
952 | ||
953 | /* | |
954 | * Compute state values. Note that throttling displays a linear power | |
955 | * performance relationship (at 50% performance the CPU will consume | |
956 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. | |
957 | */ | |
958 | ||
959 | step = (1000 / pr->throttling.state_count); | |
960 | ||
961 | for (i = 0; i < pr->throttling.state_count; i++) { | |
962 | pr->throttling.states[i].performance = 1000 - step * i; | |
963 | pr->throttling.states[i].power = 1000 - step * i; | |
964 | } | |
965 | return 0; | |
966 | } | |
967 | ||
6c5cf8aa | 968 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
2a908002 | 969 | int state, bool force) |
1da177e4 | 970 | { |
4be44fcd LB |
971 | u32 value = 0; |
972 | u32 duty_mask = 0; | |
973 | u32 duty_value = 0; | |
1da177e4 | 974 | |
1da177e4 | 975 | if (!pr) |
d550d98d | 976 | return -EINVAL; |
1da177e4 LT |
977 | |
978 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
d550d98d | 979 | return -EINVAL; |
1da177e4 LT |
980 | |
981 | if (!pr->flags.throttling) | |
d550d98d | 982 | return -ENODEV; |
1da177e4 | 983 | |
2a908002 | 984 | if (!force && (state == pr->throttling.state)) |
d550d98d | 985 | return 0; |
1da177e4 | 986 | |
01854e69 LY |
987 | if (state < pr->throttling_platform_limit) |
988 | return -EPERM; | |
1da177e4 LT |
989 | /* |
990 | * Calculate the duty_value and duty_mask. | |
991 | */ | |
992 | if (state) { | |
993 | duty_value = pr->throttling.state_count - state; | |
994 | ||
995 | duty_value <<= pr->throttling.duty_offset; | |
996 | ||
997 | /* Used to clear all duty_value bits */ | |
998 | duty_mask = pr->throttling.state_count - 1; | |
999 | ||
cee324b1 | 1000 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
1da177e4 LT |
1001 | duty_mask = ~duty_mask; |
1002 | } | |
1003 | ||
1004 | local_irq_disable(); | |
1005 | ||
1006 | /* | |
1007 | * Disable throttling by writing a 0 to bit 4. Note that we must | |
1008 | * turn it off before you can change the duty_value. | |
1009 | */ | |
1010 | value = inl(pr->throttling.address); | |
1011 | if (value & 0x10) { | |
1012 | value &= 0xFFFFFFEF; | |
1013 | outl(value, pr->throttling.address); | |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * Write the new duty_value and then enable throttling. Note | |
1018 | * that a state value of 0 leaves throttling disabled. | |
1019 | */ | |
1020 | if (state) { | |
1021 | value &= duty_mask; | |
1022 | value |= duty_value; | |
1023 | outl(value, pr->throttling.address); | |
1024 | ||
1025 | value |= 0x00000010; | |
1026 | outl(value, pr->throttling.address); | |
1027 | } | |
1028 | ||
1029 | pr->throttling.state = state; | |
1030 | ||
1031 | local_irq_enable(); | |
1032 | ||
1033 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
1034 | "Throttling state set to T%d (%d%%)\n", state, |
1035 | (pr->throttling.states[state].performance ? pr-> | |
1036 | throttling.states[state].performance / 10 : 0))); | |
1da177e4 | 1037 | |
d550d98d | 1038 | return 0; |
1da177e4 LT |
1039 | } |
1040 | ||
6c5cf8aa | 1041 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
2a908002 | 1042 | int state, bool force) |
01854e69 | 1043 | { |
0753f6e0 | 1044 | int ret; |
439913ff | 1045 | u64 value; |
01854e69 LY |
1046 | |
1047 | if (!pr) | |
1048 | return -EINVAL; | |
1049 | ||
1050 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1051 | return -EINVAL; | |
1052 | ||
1053 | if (!pr->flags.throttling) | |
1054 | return -ENODEV; | |
1055 | ||
2a908002 | 1056 | if (!force && (state == pr->throttling.state)) |
01854e69 LY |
1057 | return 0; |
1058 | ||
1059 | if (state < pr->throttling_platform_limit) | |
1060 | return -EPERM; | |
1061 | ||
0753f6e0 ZY |
1062 | value = 0; |
1063 | ret = acpi_get_throttling_value(pr, state, &value); | |
1064 | if (ret >= 0) { | |
1065 | acpi_write_throttling_state(pr, value); | |
01854e69 LY |
1066 | pr->throttling.state = state; |
1067 | } | |
01854e69 LY |
1068 | |
1069 | return 0; | |
1070 | } | |
1071 | ||
44ae49aa LT |
1072 | static long acpi_processor_throttling_fn(void *data) |
1073 | { | |
1074 | struct acpi_processor_throttling_arg *arg = data; | |
1075 | struct acpi_processor *pr = arg->pr; | |
1076 | ||
1077 | return pr->throttling.acpi_processor_set_throttling(pr, | |
1078 | arg->target_state, arg->force); | |
1079 | } | |
1080 | ||
2a908002 FP |
1081 | int acpi_processor_set_throttling(struct acpi_processor *pr, |
1082 | int state, bool force) | |
01854e69 | 1083 | { |
3391a76f | 1084 | int ret = 0; |
33a2a529 ZY |
1085 | unsigned int i; |
1086 | struct acpi_processor *match_pr; | |
1087 | struct acpi_processor_throttling *p_throttling; | |
44ae49aa | 1088 | struct acpi_processor_throttling_arg arg; |
33a2a529 | 1089 | struct throttling_tstate t_state; |
87654273 ZY |
1090 | |
1091 | if (!pr) | |
1092 | return -EINVAL; | |
1093 | ||
1094 | if (!pr->flags.throttling) | |
1095 | return -ENODEV; | |
1096 | ||
1097 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1098 | return -EINVAL; | |
1099 | ||
daef1f35 ZY |
1100 | if (cpu_is_offline(pr->id)) { |
1101 | /* | |
1102 | * the cpu pointed by pr->id is offline. Unnecessary to change | |
1103 | * the throttling state any more. | |
1104 | */ | |
1105 | return -ENODEV; | |
1106 | } | |
1107 | ||
33a2a529 ZY |
1108 | t_state.target_state = state; |
1109 | p_throttling = &(pr->throttling); | |
44ae49aa | 1110 | |
357dc4c3 | 1111 | /* |
33a2a529 ZY |
1112 | * The throttling notifier will be called for every |
1113 | * affected cpu in order to get one proper T-state. | |
1114 | * The notifier event is THROTTLING_PRECHANGE. | |
357dc4c3 | 1115 | */ |
44ae49aa | 1116 | for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) { |
33a2a529 ZY |
1117 | t_state.cpu = i; |
1118 | acpi_processor_throttling_notifier(THROTTLING_PRECHANGE, | |
1119 | &t_state); | |
1120 | } | |
1121 | /* | |
1122 | * The function of acpi_processor_set_throttling will be called | |
1123 | * to switch T-state. If the coordination type is SW_ALL or HW_ALL, | |
1124 | * it is necessary to call it for every affected cpu. Otherwise | |
1125 | * it can be called only for the cpu pointed by pr. | |
1126 | */ | |
1127 | if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) { | |
44ae49aa LT |
1128 | arg.pr = pr; |
1129 | arg.target_state = state; | |
1130 | arg.force = force; | |
1131 | ret = work_on_cpu(pr->id, acpi_processor_throttling_fn, &arg); | |
33a2a529 ZY |
1132 | } else { |
1133 | /* | |
1134 | * When the T-state coordination is SW_ALL or HW_ALL, | |
1135 | * it is necessary to set T-state for every affected | |
1136 | * cpus. | |
1137 | */ | |
44ae49aa LT |
1138 | for_each_cpu_and(i, cpu_online_mask, |
1139 | p_throttling->shared_cpu_map) { | |
706546d0 | 1140 | match_pr = per_cpu(processors, i); |
33a2a529 ZY |
1141 | /* |
1142 | * If the pointer is invalid, we will report the | |
1143 | * error message and continue. | |
1144 | */ | |
1145 | if (!match_pr) { | |
1146 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1147 | "Invalid Pointer for CPU %d\n", i)); | |
1148 | continue; | |
1149 | } | |
1150 | /* | |
1151 | * If the throttling control is unsupported on CPU i, | |
1152 | * we will report the error message and continue. | |
1153 | */ | |
1154 | if (!match_pr->flags.throttling) { | |
1155 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
25985edc | 1156 | "Throttling Control is unsupported " |
33a2a529 ZY |
1157 | "on CPU %d\n", i)); |
1158 | continue; | |
1159 | } | |
44ae49aa LT |
1160 | |
1161 | arg.pr = match_pr; | |
1162 | arg.target_state = state; | |
1163 | arg.force = force; | |
1164 | ret = work_on_cpu(pr->id, acpi_processor_throttling_fn, | |
1165 | &arg); | |
33a2a529 ZY |
1166 | } |
1167 | } | |
1168 | /* | |
1169 | * After the set_throttling is called, the | |
1170 | * throttling notifier is called for every | |
1171 | * affected cpu to update the T-states. | |
1172 | * The notifier event is THROTTLING_POSTCHANGE | |
1173 | */ | |
44ae49aa | 1174 | for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) { |
33a2a529 ZY |
1175 | t_state.cpu = i; |
1176 | acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE, | |
1177 | &t_state); | |
1178 | } | |
44ae49aa | 1179 | |
357dc4c3 | 1180 | return ret; |
01854e69 LY |
1181 | } |
1182 | ||
4be44fcd | 1183 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
1da177e4 | 1184 | { |
4be44fcd | 1185 | int result = 0; |
1180509f | 1186 | struct acpi_processor_throttling *pthrottling; |
1da177e4 | 1187 | |
1da177e4 | 1188 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
1189 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
1190 | pr->throttling.address, | |
1191 | pr->throttling.duty_offset, | |
1192 | pr->throttling.duty_width)); | |
1da177e4 | 1193 | |
c30c620e LB |
1194 | /* |
1195 | * Evaluate _PTC, _TSS and _TPC | |
1196 | * They must all be present or none of them can be used. | |
1197 | */ | |
1198 | if (acpi_processor_get_throttling_control(pr) || | |
1199 | acpi_processor_get_throttling_states(pr) || | |
1200 | acpi_processor_get_platform_limit(pr)) | |
1201 | { | |
ff55a9ce LB |
1202 | pr->throttling.acpi_processor_get_throttling = |
1203 | &acpi_processor_get_throttling_fadt; | |
1204 | pr->throttling.acpi_processor_set_throttling = | |
1205 | &acpi_processor_set_throttling_fadt; | |
d1154be3 AS |
1206 | if (acpi_processor_get_fadt_info(pr)) |
1207 | return 0; | |
01854e69 | 1208 | } else { |
ff55a9ce LB |
1209 | pr->throttling.acpi_processor_get_throttling = |
1210 | &acpi_processor_get_throttling_ptc; | |
1211 | pr->throttling.acpi_processor_set_throttling = | |
1212 | &acpi_processor_set_throttling_ptc; | |
01854e69 | 1213 | } |
1da177e4 | 1214 | |
1180509f ZY |
1215 | /* |
1216 | * If TSD package for one CPU can't be parsed successfully, it means | |
1217 | * that this CPU will have no coordination with other CPUs. | |
1218 | */ | |
1219 | if (acpi_processor_get_tsd(pr)) { | |
1220 | pthrottling = &pr->throttling; | |
1221 | pthrottling->tsd_valid_flag = 0; | |
2fdf66b4 | 1222 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
1223 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
1224 | } | |
c30c620e | 1225 | |
1da177e4 LT |
1226 | /* |
1227 | * PIIX4 Errata: We don't support throttling on the original PIIX4. | |
1228 | * This shouldn't be an issue as few (if any) mobile systems ever | |
1229 | * used this part. | |
1230 | */ | |
1231 | if (errata.piix4.throttle) { | |
1232 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 1233 | "Throttling not supported on PIIX4 A- or B-step\n")); |
d550d98d | 1234 | return 0; |
1da177e4 LT |
1235 | } |
1236 | ||
1da177e4 | 1237 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
4be44fcd | 1238 | pr->throttling.state_count)); |
1da177e4 LT |
1239 | |
1240 | pr->flags.throttling = 1; | |
1241 | ||
1242 | /* | |
1243 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. | |
1244 | * thermal) decide to lower performance if it so chooses, but for now | |
1245 | * we'll crank up the speed. | |
1246 | */ | |
1247 | ||
1248 | result = acpi_processor_get_throttling(pr); | |
1249 | if (result) | |
1250 | goto end; | |
1251 | ||
1252 | if (pr->throttling.state) { | |
4be44fcd LB |
1253 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1254 | "Disabling throttling (was T%d)\n", | |
1255 | pr->throttling.state)); | |
2a908002 | 1256 | result = acpi_processor_set_throttling(pr, 0, false); |
1da177e4 LT |
1257 | if (result) |
1258 | goto end; | |
1259 | } | |
1260 | ||
4be44fcd | 1261 | end: |
1da177e4 LT |
1262 | if (result) |
1263 | pr->flags.throttling = 0; | |
1264 | ||
d550d98d | 1265 | return result; |
1da177e4 LT |
1266 | } |
1267 |