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