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> | |
31 | #include <linux/init.h> | |
357dc4c3 | 32 | #include <linux/sched.h> |
1da177e4 LT |
33 | #include <linux/cpufreq.h> |
34 | #include <linux/proc_fs.h> | |
35 | #include <linux/seq_file.h> | |
36 | ||
37 | #include <asm/io.h> | |
38 | #include <asm/uaccess.h> | |
39 | ||
40 | #include <acpi/acpi_bus.h> | |
89595b8f | 41 | #include <acpi/acpi_drivers.h> |
1da177e4 LT |
42 | #include <acpi/processor.h> |
43 | ||
a192a958 LB |
44 | #define PREFIX "ACPI: " |
45 | ||
1da177e4 | 46 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 | 47 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
f52fd66d | 48 | ACPI_MODULE_NAME("processor_throttling"); |
1da177e4 | 49 | |
56c213fa ZR |
50 | /* ignore_tpc: |
51 | * 0 -> acpi processor driver doesn't ignore _TPC values | |
52 | * 1 -> acpi processor driver ignores _TPC values | |
53 | */ | |
54 | static int ignore_tpc; | |
55 | module_param(ignore_tpc, int, 0644); | |
56 | MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support"); | |
57 | ||
e4aa5cb2 ZY |
58 | struct throttling_tstate { |
59 | unsigned int cpu; /* cpu nr */ | |
60 | int target_state; /* target T-state */ | |
61 | }; | |
62 | ||
63 | #define THROTTLING_PRECHANGE (1) | |
64 | #define THROTTLING_POSTCHANGE (2) | |
65 | ||
ff55a9ce | 66 | static int acpi_processor_get_throttling(struct acpi_processor *pr); |
2a908002 FP |
67 | int acpi_processor_set_throttling(struct acpi_processor *pr, |
68 | int state, bool force); | |
01854e69 | 69 | |
1180509f ZY |
70 | static int acpi_processor_update_tsd_coord(void) |
71 | { | |
72 | int count, count_target; | |
73 | int retval = 0; | |
74 | unsigned int i, j; | |
2fdf66b4 | 75 | cpumask_var_t covered_cpus; |
1180509f ZY |
76 | struct acpi_processor *pr, *match_pr; |
77 | struct acpi_tsd_package *pdomain, *match_pdomain; | |
78 | struct acpi_processor_throttling *pthrottling, *match_pthrottling; | |
79 | ||
79f55997 | 80 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
81 | return -ENOMEM; |
82 | ||
1180509f ZY |
83 | /* |
84 | * Now that we have _TSD data from all CPUs, lets setup T-state | |
33a2a529 | 85 | * coordination between all CPUs. |
1180509f ZY |
86 | */ |
87 | for_each_possible_cpu(i) { | |
706546d0 | 88 | pr = per_cpu(processors, i); |
1180509f ZY |
89 | if (!pr) |
90 | continue; | |
91 | ||
92 | /* Basic validity check for domain info */ | |
93 | pthrottling = &(pr->throttling); | |
94 | ||
95 | /* | |
96 | * If tsd package for one cpu is invalid, the coordination | |
97 | * among all CPUs is thought as invalid. | |
98 | * Maybe it is ugly. | |
99 | */ | |
100 | if (!pthrottling->tsd_valid_flag) { | |
101 | retval = -EINVAL; | |
102 | break; | |
103 | } | |
104 | } | |
105 | if (retval) | |
106 | goto err_ret; | |
107 | ||
1180509f | 108 | for_each_possible_cpu(i) { |
706546d0 | 109 | pr = per_cpu(processors, i); |
1180509f ZY |
110 | if (!pr) |
111 | continue; | |
112 | ||
2fdf66b4 | 113 | if (cpumask_test_cpu(i, covered_cpus)) |
1180509f ZY |
114 | continue; |
115 | pthrottling = &pr->throttling; | |
116 | ||
117 | pdomain = &(pthrottling->domain_info); | |
2fdf66b4 RR |
118 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); |
119 | cpumask_set_cpu(i, covered_cpus); | |
1180509f ZY |
120 | /* |
121 | * If the number of processor in the TSD domain is 1, it is | |
122 | * unnecessary to parse the coordination for this CPU. | |
123 | */ | |
124 | if (pdomain->num_processors <= 1) | |
125 | continue; | |
126 | ||
127 | /* Validate the Domain info */ | |
128 | count_target = pdomain->num_processors; | |
129 | count = 1; | |
130 | ||
131 | for_each_possible_cpu(j) { | |
132 | if (i == j) | |
133 | continue; | |
134 | ||
706546d0 | 135 | match_pr = per_cpu(processors, j); |
1180509f ZY |
136 | if (!match_pr) |
137 | continue; | |
138 | ||
139 | match_pthrottling = &(match_pr->throttling); | |
140 | match_pdomain = &(match_pthrottling->domain_info); | |
141 | if (match_pdomain->domain != pdomain->domain) | |
142 | continue; | |
143 | ||
144 | /* Here i and j are in the same domain. | |
145 | * If two TSD packages have the same domain, they | |
146 | * should have the same num_porcessors and | |
147 | * coordination type. Otherwise it will be regarded | |
148 | * as illegal. | |
149 | */ | |
150 | if (match_pdomain->num_processors != count_target) { | |
151 | retval = -EINVAL; | |
152 | goto err_ret; | |
153 | } | |
154 | ||
155 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
156 | retval = -EINVAL; | |
157 | goto err_ret; | |
158 | } | |
159 | ||
2fdf66b4 RR |
160 | cpumask_set_cpu(j, covered_cpus); |
161 | cpumask_set_cpu(j, pthrottling->shared_cpu_map); | |
1180509f ZY |
162 | count++; |
163 | } | |
164 | for_each_possible_cpu(j) { | |
165 | if (i == j) | |
166 | continue; | |
167 | ||
706546d0 | 168 | match_pr = per_cpu(processors, j); |
1180509f ZY |
169 | if (!match_pr) |
170 | continue; | |
171 | ||
172 | match_pthrottling = &(match_pr->throttling); | |
173 | match_pdomain = &(match_pthrottling->domain_info); | |
174 | if (match_pdomain->domain != pdomain->domain) | |
175 | continue; | |
176 | ||
177 | /* | |
178 | * If some CPUS have the same domain, they | |
179 | * will have the same shared_cpu_map. | |
180 | */ | |
2fdf66b4 RR |
181 | cpumask_copy(match_pthrottling->shared_cpu_map, |
182 | pthrottling->shared_cpu_map); | |
1180509f ZY |
183 | } |
184 | } | |
185 | ||
186 | err_ret: | |
2fdf66b4 RR |
187 | free_cpumask_var(covered_cpus); |
188 | ||
1180509f | 189 | for_each_possible_cpu(i) { |
706546d0 | 190 | pr = per_cpu(processors, i); |
1180509f ZY |
191 | if (!pr) |
192 | continue; | |
193 | ||
194 | /* | |
195 | * Assume no coordination on any error parsing domain info. | |
196 | * The coordination type will be forced as SW_ALL. | |
197 | */ | |
198 | if (retval) { | |
199 | pthrottling = &(pr->throttling); | |
2fdf66b4 RR |
200 | cpumask_clear(pthrottling->shared_cpu_map); |
201 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); | |
1180509f ZY |
202 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
203 | } | |
204 | } | |
205 | ||
206 | return retval; | |
207 | } | |
208 | ||
209 | /* | |
210 | * Update the T-state coordination after the _TSD | |
211 | * data for all cpus is obtained. | |
212 | */ | |
213 | void acpi_processor_throttling_init(void) | |
214 | { | |
215 | if (acpi_processor_update_tsd_coord()) | |
216 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
217 | "Assume no T-state coordination\n")); | |
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 | ||
c30c620e LB |
369 | /* |
370 | * _PTC - Processor Throttling Control (and status) register location | |
371 | */ | |
01854e69 LY |
372 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) |
373 | { | |
374 | int result = 0; | |
375 | acpi_status status = 0; | |
376 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
377 | union acpi_object *ptc = NULL; | |
378 | union acpi_object obj = { 0 }; | |
9bcb2721 | 379 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
380 | |
381 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); | |
382 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
383 | if (status != AE_NOT_FOUND) { |
384 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); | |
385 | } | |
01854e69 LY |
386 | return -ENODEV; |
387 | } | |
388 | ||
389 | ptc = (union acpi_object *)buffer.pointer; | |
390 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) | |
391 | || (ptc->package.count != 2)) { | |
392 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); | |
393 | result = -EFAULT; | |
394 | goto end; | |
395 | } | |
396 | ||
397 | /* | |
398 | * control_register | |
399 | */ | |
400 | ||
401 | obj = ptc->package.elements[0]; | |
402 | ||
403 | if ((obj.type != ACPI_TYPE_BUFFER) | |
404 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
405 | || (obj.buffer.pointer == NULL)) { | |
ff55a9ce LB |
406 | printk(KERN_ERR PREFIX |
407 | "Invalid _PTC data (control_register)\n"); | |
01854e69 LY |
408 | result = -EFAULT; |
409 | goto end; | |
410 | } | |
411 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, | |
412 | sizeof(struct acpi_ptc_register)); | |
413 | ||
414 | /* | |
415 | * status_register | |
416 | */ | |
417 | ||
418 | obj = ptc->package.elements[1]; | |
419 | ||
420 | if ((obj.type != ACPI_TYPE_BUFFER) | |
421 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
422 | || (obj.buffer.pointer == NULL)) { | |
423 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); | |
424 | result = -EFAULT; | |
425 | goto end; | |
426 | } | |
427 | ||
428 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, | |
ff55a9ce | 429 | sizeof(struct acpi_ptc_register)); |
01854e69 | 430 | |
9bcb2721 ZY |
431 | throttling = &pr->throttling; |
432 | ||
433 | if ((throttling->control_register.bit_width + | |
434 | throttling->control_register.bit_offset) > 32) { | |
435 | printk(KERN_ERR PREFIX "Invalid _PTC control register\n"); | |
436 | result = -EFAULT; | |
437 | goto end; | |
438 | } | |
439 | ||
440 | if ((throttling->status_register.bit_width + | |
441 | throttling->status_register.bit_offset) > 32) { | |
442 | printk(KERN_ERR PREFIX "Invalid _PTC status register\n"); | |
443 | result = -EFAULT; | |
444 | goto end; | |
445 | } | |
446 | ||
ff55a9ce | 447 | end: |
01854e69 LY |
448 | kfree(buffer.pointer); |
449 | ||
450 | return result; | |
451 | } | |
c30c620e LB |
452 | |
453 | /* | |
454 | * _TSS - Throttling Supported States | |
455 | */ | |
01854e69 LY |
456 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) |
457 | { | |
458 | int result = 0; | |
459 | acpi_status status = AE_OK; | |
460 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
461 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
462 | struct acpi_buffer state = { 0, NULL }; | |
463 | union acpi_object *tss = NULL; | |
464 | int i; | |
465 | ||
466 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); | |
467 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
468 | if (status != AE_NOT_FOUND) { |
469 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); | |
470 | } | |
01854e69 LY |
471 | return -ENODEV; |
472 | } | |
473 | ||
474 | tss = buffer.pointer; | |
475 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { | |
476 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); | |
477 | result = -EFAULT; | |
478 | goto end; | |
479 | } | |
480 | ||
481 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
482 | tss->package.count)); | |
483 | ||
484 | pr->throttling.state_count = tss->package.count; | |
485 | pr->throttling.states_tss = | |
486 | kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count, | |
487 | GFP_KERNEL); | |
488 | if (!pr->throttling.states_tss) { | |
489 | result = -ENOMEM; | |
490 | goto end; | |
491 | } | |
492 | ||
493 | for (i = 0; i < pr->throttling.state_count; i++) { | |
494 | ||
ff55a9ce LB |
495 | struct acpi_processor_tx_tss *tx = |
496 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
497 | states_tss[i]); | |
01854e69 LY |
498 | |
499 | state.length = sizeof(struct acpi_processor_tx_tss); | |
500 | state.pointer = tx; | |
501 | ||
502 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
503 | ||
504 | status = acpi_extract_package(&(tss->package.elements[i]), | |
505 | &format, &state); | |
506 | if (ACPI_FAILURE(status)) { | |
507 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); | |
508 | result = -EFAULT; | |
509 | kfree(pr->throttling.states_tss); | |
510 | goto end; | |
511 | } | |
512 | ||
513 | if (!tx->freqpercentage) { | |
514 | printk(KERN_ERR PREFIX | |
ff55a9ce | 515 | "Invalid _TSS data: freq is zero\n"); |
01854e69 LY |
516 | result = -EFAULT; |
517 | kfree(pr->throttling.states_tss); | |
518 | goto end; | |
519 | } | |
520 | } | |
521 | ||
522 | end: | |
523 | kfree(buffer.pointer); | |
524 | ||
525 | return result; | |
526 | } | |
c30c620e LB |
527 | |
528 | /* | |
529 | * _TSD - T-State Dependencies | |
530 | */ | |
ff55a9ce | 531 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
01854e69 LY |
532 | { |
533 | int result = 0; | |
534 | acpi_status status = AE_OK; | |
ff55a9ce LB |
535 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
536 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
537 | struct acpi_buffer state = { 0, NULL }; | |
538 | union acpi_object *tsd = NULL; | |
01854e69 | 539 | struct acpi_tsd_package *pdomain; |
1180509f ZY |
540 | struct acpi_processor_throttling *pthrottling; |
541 | ||
542 | pthrottling = &pr->throttling; | |
543 | pthrottling->tsd_valid_flag = 0; | |
01854e69 LY |
544 | |
545 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); | |
546 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
547 | if (status != AE_NOT_FOUND) { |
548 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD")); | |
549 | } | |
01854e69 LY |
550 | return -ENODEV; |
551 | } | |
552 | ||
553 | tsd = buffer.pointer; | |
554 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { | |
55ac9a01 | 555 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
556 | result = -EFAULT; |
557 | goto end; | |
558 | } | |
559 | ||
560 | if (tsd->package.count != 1) { | |
55ac9a01 | 561 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
562 | result = -EFAULT; |
563 | goto end; | |
564 | } | |
565 | ||
566 | pdomain = &(pr->throttling.domain_info); | |
567 | ||
568 | state.length = sizeof(struct acpi_tsd_package); | |
569 | state.pointer = pdomain; | |
570 | ||
571 | status = acpi_extract_package(&(tsd->package.elements[0]), | |
ff55a9ce | 572 | &format, &state); |
01854e69 | 573 | if (ACPI_FAILURE(status)) { |
55ac9a01 | 574 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
575 | result = -EFAULT; |
576 | goto end; | |
577 | } | |
578 | ||
579 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { | |
55ac9a01 | 580 | printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n"); |
01854e69 LY |
581 | result = -EFAULT; |
582 | goto end; | |
583 | } | |
584 | ||
585 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { | |
55ac9a01 | 586 | printk(KERN_ERR PREFIX "Unknown _TSD:revision\n"); |
01854e69 LY |
587 | result = -EFAULT; |
588 | goto end; | |
589 | } | |
590 | ||
1180509f ZY |
591 | pthrottling = &pr->throttling; |
592 | pthrottling->tsd_valid_flag = 1; | |
593 | pthrottling->shared_type = pdomain->coord_type; | |
2fdf66b4 | 594 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
595 | /* |
596 | * If the coordination type is not defined in ACPI spec, | |
597 | * the tsd_valid_flag will be clear and coordination type | |
598 | * will be forecd as DOMAIN_COORD_TYPE_SW_ALL. | |
599 | */ | |
600 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
601 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
602 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
603 | pthrottling->tsd_valid_flag = 0; | |
604 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; | |
605 | } | |
606 | ||
ff55a9ce | 607 | end: |
01854e69 LY |
608 | kfree(buffer.pointer); |
609 | return result; | |
610 | } | |
611 | ||
1da177e4 LT |
612 | /* -------------------------------------------------------------------------- |
613 | Throttling Control | |
614 | -------------------------------------------------------------------------- */ | |
01854e69 | 615 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
1da177e4 | 616 | { |
4be44fcd LB |
617 | int state = 0; |
618 | u32 value = 0; | |
619 | u32 duty_mask = 0; | |
620 | u32 duty_value = 0; | |
1da177e4 | 621 | |
1da177e4 | 622 | if (!pr) |
d550d98d | 623 | return -EINVAL; |
1da177e4 LT |
624 | |
625 | if (!pr->flags.throttling) | |
d550d98d | 626 | return -ENODEV; |
1da177e4 LT |
627 | |
628 | pr->throttling.state = 0; | |
629 | ||
630 | duty_mask = pr->throttling.state_count - 1; | |
631 | ||
632 | duty_mask <<= pr->throttling.duty_offset; | |
633 | ||
634 | local_irq_disable(); | |
635 | ||
636 | value = inl(pr->throttling.address); | |
637 | ||
638 | /* | |
639 | * Compute the current throttling state when throttling is enabled | |
640 | * (bit 4 is on). | |
641 | */ | |
642 | if (value & 0x10) { | |
643 | duty_value = value & duty_mask; | |
644 | duty_value >>= pr->throttling.duty_offset; | |
645 | ||
646 | if (duty_value) | |
4be44fcd | 647 | state = pr->throttling.state_count - duty_value; |
1da177e4 LT |
648 | } |
649 | ||
650 | pr->throttling.state = state; | |
651 | ||
652 | local_irq_enable(); | |
653 | ||
654 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
655 | "Throttling state is T%d (%d%% throttling applied)\n", |
656 | state, pr->throttling.states[state].performance)); | |
1da177e4 | 657 | |
d550d98d | 658 | return 0; |
1da177e4 LT |
659 | } |
660 | ||
f79f06ab ZY |
661 | #ifdef CONFIG_X86 |
662 | static int acpi_throttling_rdmsr(struct acpi_processor *pr, | |
439913ff | 663 | u64 *value) |
f79f06ab ZY |
664 | { |
665 | struct cpuinfo_x86 *c; | |
666 | u64 msr_high, msr_low; | |
667 | unsigned int cpu; | |
668 | u64 msr = 0; | |
669 | int ret = -1; | |
670 | ||
671 | cpu = pr->id; | |
672 | c = &cpu_data(cpu); | |
673 | ||
674 | if ((c->x86_vendor != X86_VENDOR_INTEL) || | |
675 | !cpu_has(c, X86_FEATURE_ACPI)) { | |
676 | printk(KERN_ERR PREFIX | |
677 | "HARDWARE addr space,NOT supported yet\n"); | |
678 | } else { | |
679 | msr_low = 0; | |
680 | msr_high = 0; | |
357dc4c3 | 681 | rdmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
682 | (u32 *)&msr_low , (u32 *) &msr_high); |
683 | msr = (msr_high << 32) | msr_low; | |
439913ff | 684 | *value = (u64) msr; |
f79f06ab ZY |
685 | ret = 0; |
686 | } | |
687 | return ret; | |
688 | } | |
689 | ||
439913ff | 690 | static int acpi_throttling_wrmsr(struct acpi_processor *pr, u64 value) |
f79f06ab ZY |
691 | { |
692 | struct cpuinfo_x86 *c; | |
693 | unsigned int cpu; | |
694 | int ret = -1; | |
695 | u64 msr; | |
696 | ||
697 | cpu = pr->id; | |
698 | c = &cpu_data(cpu); | |
699 | ||
700 | if ((c->x86_vendor != X86_VENDOR_INTEL) || | |
701 | !cpu_has(c, X86_FEATURE_ACPI)) { | |
702 | printk(KERN_ERR PREFIX | |
703 | "HARDWARE addr space,NOT supported yet\n"); | |
704 | } else { | |
705 | msr = value; | |
357dc4c3 | 706 | wrmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
707 | msr & 0xffffffff, msr >> 32); |
708 | ret = 0; | |
709 | } | |
710 | return ret; | |
711 | } | |
712 | #else | |
713 | static int acpi_throttling_rdmsr(struct acpi_processor *pr, | |
439913ff | 714 | u64 *value) |
f79f06ab ZY |
715 | { |
716 | printk(KERN_ERR PREFIX | |
717 | "HARDWARE addr space,NOT supported yet\n"); | |
718 | return -1; | |
719 | } | |
720 | ||
439913ff | 721 | static int acpi_throttling_wrmsr(struct acpi_processor *pr, u64 value) |
f79f06ab ZY |
722 | { |
723 | printk(KERN_ERR PREFIX | |
724 | "HARDWARE addr space,NOT supported yet\n"); | |
725 | return -1; | |
726 | } | |
727 | #endif | |
728 | ||
0753f6e0 | 729 | static int acpi_read_throttling_status(struct acpi_processor *pr, |
439913ff | 730 | u64 *value) |
01854e69 | 731 | { |
9bcb2721 | 732 | u32 bit_width, bit_offset; |
0753f6e0 | 733 | u64 ptc_value; |
9bcb2721 | 734 | u64 ptc_mask; |
0753f6e0 ZY |
735 | struct acpi_processor_throttling *throttling; |
736 | int ret = -1; | |
737 | ||
738 | throttling = &pr->throttling; | |
01854e69 LY |
739 | switch (throttling->status_register.space_id) { |
740 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
0753f6e0 | 741 | ptc_value = 0; |
9bcb2721 ZY |
742 | bit_width = throttling->status_register.bit_width; |
743 | bit_offset = throttling->status_register.bit_offset; | |
744 | ||
ff55a9ce | 745 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
0753f6e0 | 746 | address, (u32 *) &ptc_value, |
9bcb2721 ZY |
747 | (u32) (bit_width + bit_offset)); |
748 | ptc_mask = (1 << bit_width) - 1; | |
439913ff | 749 | *value = (u64) ((ptc_value >> bit_offset) & ptc_mask); |
0753f6e0 | 750 | ret = 0; |
01854e69 LY |
751 | break; |
752 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
f79f06ab | 753 | ret = acpi_throttling_rdmsr(pr, value); |
01854e69 LY |
754 | break; |
755 | default: | |
756 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 757 | (u32) (throttling->status_register.space_id)); |
01854e69 | 758 | } |
0753f6e0 | 759 | return ret; |
01854e69 LY |
760 | } |
761 | ||
0753f6e0 | 762 | static int acpi_write_throttling_state(struct acpi_processor *pr, |
439913ff | 763 | u64 value) |
01854e69 | 764 | { |
9bcb2721 | 765 | u32 bit_width, bit_offset; |
0753f6e0 | 766 | u64 ptc_value; |
9bcb2721 | 767 | u64 ptc_mask; |
0753f6e0 | 768 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
769 | int ret = -1; |
770 | ||
0753f6e0 | 771 | throttling = &pr->throttling; |
01854e69 LY |
772 | switch (throttling->control_register.space_id) { |
773 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
774 | bit_width = throttling->control_register.bit_width; |
775 | bit_offset = throttling->control_register.bit_offset; | |
776 | ptc_mask = (1 << bit_width) - 1; | |
777 | ptc_value = value & ptc_mask; | |
778 | ||
ff55a9ce | 779 | acpi_os_write_port((acpi_io_address) throttling-> |
9bcb2721 ZY |
780 | control_register.address, |
781 | (u32) (ptc_value << bit_offset), | |
782 | (u32) (bit_width + bit_offset)); | |
01854e69 LY |
783 | ret = 0; |
784 | break; | |
785 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
f79f06ab | 786 | ret = acpi_throttling_wrmsr(pr, value); |
01854e69 LY |
787 | break; |
788 | default: | |
789 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 790 | (u32) (throttling->control_register.space_id)); |
01854e69 LY |
791 | } |
792 | return ret; | |
793 | } | |
794 | ||
0753f6e0 | 795 | static int acpi_get_throttling_state(struct acpi_processor *pr, |
439913ff | 796 | u64 value) |
01854e69 LY |
797 | { |
798 | int i; | |
799 | ||
800 | for (i = 0; i < pr->throttling.state_count; i++) { | |
ff55a9ce LB |
801 | struct acpi_processor_tx_tss *tx = |
802 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
803 | states_tss[i]); | |
804 | if (tx->control == value) | |
53af9cfb | 805 | return i; |
01854e69 | 806 | } |
53af9cfb | 807 | return -1; |
01854e69 LY |
808 | } |
809 | ||
0753f6e0 | 810 | static int acpi_get_throttling_value(struct acpi_processor *pr, |
439913ff | 811 | int state, u64 *value) |
01854e69 | 812 | { |
0753f6e0 ZY |
813 | int ret = -1; |
814 | ||
ff55a9ce LB |
815 | if (state >= 0 && state <= pr->throttling.state_count) { |
816 | struct acpi_processor_tx_tss *tx = | |
817 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
818 | states_tss[state]); | |
0753f6e0 ZY |
819 | *value = tx->control; |
820 | ret = 0; | |
01854e69 | 821 | } |
0753f6e0 | 822 | return ret; |
01854e69 LY |
823 | } |
824 | ||
825 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) | |
826 | { | |
827 | int state = 0; | |
0753f6e0 | 828 | int ret; |
439913ff | 829 | u64 value; |
01854e69 | 830 | |
01854e69 LY |
831 | if (!pr) |
832 | return -EINVAL; | |
833 | ||
834 | if (!pr->flags.throttling) | |
835 | return -ENODEV; | |
836 | ||
837 | pr->throttling.state = 0; | |
357dc4c3 | 838 | |
0753f6e0 ZY |
839 | value = 0; |
840 | ret = acpi_read_throttling_status(pr, &value); | |
841 | if (ret >= 0) { | |
ff55a9ce | 842 | state = acpi_get_throttling_state(pr, value); |
4973b22a | 843 | if (state == -1) { |
bdf57de4 FP |
844 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
845 | "Invalid throttling state, reset\n")); | |
4973b22a | 846 | state = 0; |
2a908002 | 847 | ret = acpi_processor_set_throttling(pr, state, true); |
4973b22a ZR |
848 | if (ret) |
849 | return ret; | |
850 | } | |
01854e69 LY |
851 | pr->throttling.state = state; |
852 | } | |
01854e69 LY |
853 | |
854 | return 0; | |
855 | } | |
856 | ||
01854e69 LY |
857 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
858 | { | |
2fdf66b4 | 859 | cpumask_var_t saved_mask; |
357dc4c3 ZY |
860 | int ret; |
861 | ||
87654273 ZY |
862 | if (!pr) |
863 | return -EINVAL; | |
864 | ||
865 | if (!pr->flags.throttling) | |
866 | return -ENODEV; | |
2fdf66b4 RR |
867 | |
868 | if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL)) | |
869 | return -ENOMEM; | |
870 | ||
357dc4c3 ZY |
871 | /* |
872 | * Migrate task to the cpu pointed by pr. | |
873 | */ | |
2fdf66b4 RR |
874 | cpumask_copy(saved_mask, ¤t->cpus_allowed); |
875 | /* FIXME: use work_on_cpu() */ | |
876 | set_cpus_allowed_ptr(current, cpumask_of(pr->id)); | |
357dc4c3 ZY |
877 | ret = pr->throttling.acpi_processor_get_throttling(pr); |
878 | /* restore the previous state */ | |
2fdf66b4 RR |
879 | set_cpus_allowed_ptr(current, saved_mask); |
880 | free_cpumask_var(saved_mask); | |
357dc4c3 ZY |
881 | |
882 | return ret; | |
01854e69 LY |
883 | } |
884 | ||
22cc5019 ZY |
885 | static int acpi_processor_get_fadt_info(struct acpi_processor *pr) |
886 | { | |
887 | int i, step; | |
888 | ||
889 | if (!pr->throttling.address) { | |
890 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); | |
891 | return -EINVAL; | |
892 | } else if (!pr->throttling.duty_width) { | |
893 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); | |
894 | return -EINVAL; | |
895 | } | |
896 | /* TBD: Support duty_cycle values that span bit 4. */ | |
897 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { | |
898 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); | |
899 | return -EINVAL; | |
900 | } | |
901 | ||
902 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; | |
903 | ||
904 | /* | |
905 | * Compute state values. Note that throttling displays a linear power | |
906 | * performance relationship (at 50% performance the CPU will consume | |
907 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. | |
908 | */ | |
909 | ||
910 | step = (1000 / pr->throttling.state_count); | |
911 | ||
912 | for (i = 0; i < pr->throttling.state_count; i++) { | |
913 | pr->throttling.states[i].performance = 1000 - step * i; | |
914 | pr->throttling.states[i].power = 1000 - step * i; | |
915 | } | |
916 | return 0; | |
917 | } | |
918 | ||
6c5cf8aa | 919 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
2a908002 | 920 | int state, bool force) |
1da177e4 | 921 | { |
4be44fcd LB |
922 | u32 value = 0; |
923 | u32 duty_mask = 0; | |
924 | u32 duty_value = 0; | |
1da177e4 | 925 | |
1da177e4 | 926 | if (!pr) |
d550d98d | 927 | return -EINVAL; |
1da177e4 LT |
928 | |
929 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
d550d98d | 930 | return -EINVAL; |
1da177e4 LT |
931 | |
932 | if (!pr->flags.throttling) | |
d550d98d | 933 | return -ENODEV; |
1da177e4 | 934 | |
2a908002 | 935 | if (!force && (state == pr->throttling.state)) |
d550d98d | 936 | return 0; |
1da177e4 | 937 | |
01854e69 LY |
938 | if (state < pr->throttling_platform_limit) |
939 | return -EPERM; | |
1da177e4 LT |
940 | /* |
941 | * Calculate the duty_value and duty_mask. | |
942 | */ | |
943 | if (state) { | |
944 | duty_value = pr->throttling.state_count - state; | |
945 | ||
946 | duty_value <<= pr->throttling.duty_offset; | |
947 | ||
948 | /* Used to clear all duty_value bits */ | |
949 | duty_mask = pr->throttling.state_count - 1; | |
950 | ||
cee324b1 | 951 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
1da177e4 LT |
952 | duty_mask = ~duty_mask; |
953 | } | |
954 | ||
955 | local_irq_disable(); | |
956 | ||
957 | /* | |
958 | * Disable throttling by writing a 0 to bit 4. Note that we must | |
959 | * turn it off before you can change the duty_value. | |
960 | */ | |
961 | value = inl(pr->throttling.address); | |
962 | if (value & 0x10) { | |
963 | value &= 0xFFFFFFEF; | |
964 | outl(value, pr->throttling.address); | |
965 | } | |
966 | ||
967 | /* | |
968 | * Write the new duty_value and then enable throttling. Note | |
969 | * that a state value of 0 leaves throttling disabled. | |
970 | */ | |
971 | if (state) { | |
972 | value &= duty_mask; | |
973 | value |= duty_value; | |
974 | outl(value, pr->throttling.address); | |
975 | ||
976 | value |= 0x00000010; | |
977 | outl(value, pr->throttling.address); | |
978 | } | |
979 | ||
980 | pr->throttling.state = state; | |
981 | ||
982 | local_irq_enable(); | |
983 | ||
984 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
985 | "Throttling state set to T%d (%d%%)\n", state, |
986 | (pr->throttling.states[state].performance ? pr-> | |
987 | throttling.states[state].performance / 10 : 0))); | |
1da177e4 | 988 | |
d550d98d | 989 | return 0; |
1da177e4 LT |
990 | } |
991 | ||
6c5cf8aa | 992 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
2a908002 | 993 | int state, bool force) |
01854e69 | 994 | { |
0753f6e0 | 995 | int ret; |
439913ff | 996 | u64 value; |
01854e69 LY |
997 | |
998 | if (!pr) | |
999 | return -EINVAL; | |
1000 | ||
1001 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1002 | return -EINVAL; | |
1003 | ||
1004 | if (!pr->flags.throttling) | |
1005 | return -ENODEV; | |
1006 | ||
2a908002 | 1007 | if (!force && (state == pr->throttling.state)) |
01854e69 LY |
1008 | return 0; |
1009 | ||
1010 | if (state < pr->throttling_platform_limit) | |
1011 | return -EPERM; | |
1012 | ||
0753f6e0 ZY |
1013 | value = 0; |
1014 | ret = acpi_get_throttling_value(pr, state, &value); | |
1015 | if (ret >= 0) { | |
1016 | acpi_write_throttling_state(pr, value); | |
01854e69 LY |
1017 | pr->throttling.state = state; |
1018 | } | |
01854e69 LY |
1019 | |
1020 | return 0; | |
1021 | } | |
1022 | ||
2a908002 FP |
1023 | int acpi_processor_set_throttling(struct acpi_processor *pr, |
1024 | int state, bool force) | |
01854e69 | 1025 | { |
2fdf66b4 | 1026 | cpumask_var_t saved_mask; |
3391a76f | 1027 | int ret = 0; |
33a2a529 ZY |
1028 | unsigned int i; |
1029 | struct acpi_processor *match_pr; | |
1030 | struct acpi_processor_throttling *p_throttling; | |
1031 | struct throttling_tstate t_state; | |
2fdf66b4 | 1032 | cpumask_var_t online_throttling_cpus; |
87654273 ZY |
1033 | |
1034 | if (!pr) | |
1035 | return -EINVAL; | |
1036 | ||
1037 | if (!pr->flags.throttling) | |
1038 | return -ENODEV; | |
1039 | ||
1040 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1041 | return -EINVAL; | |
1042 | ||
2fdf66b4 RR |
1043 | if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL)) |
1044 | return -ENOMEM; | |
1045 | ||
1046 | if (!alloc_cpumask_var(&online_throttling_cpus, GFP_KERNEL)) { | |
1047 | free_cpumask_var(saved_mask); | |
1048 | return -ENOMEM; | |
1049 | } | |
1050 | ||
1051 | cpumask_copy(saved_mask, ¤t->cpus_allowed); | |
33a2a529 ZY |
1052 | t_state.target_state = state; |
1053 | p_throttling = &(pr->throttling); | |
2fdf66b4 RR |
1054 | cpumask_and(online_throttling_cpus, cpu_online_mask, |
1055 | p_throttling->shared_cpu_map); | |
357dc4c3 | 1056 | /* |
33a2a529 ZY |
1057 | * The throttling notifier will be called for every |
1058 | * affected cpu in order to get one proper T-state. | |
1059 | * The notifier event is THROTTLING_PRECHANGE. | |
357dc4c3 | 1060 | */ |
2fdf66b4 | 1061 | for_each_cpu(i, online_throttling_cpus) { |
33a2a529 ZY |
1062 | t_state.cpu = i; |
1063 | acpi_processor_throttling_notifier(THROTTLING_PRECHANGE, | |
1064 | &t_state); | |
1065 | } | |
1066 | /* | |
1067 | * The function of acpi_processor_set_throttling will be called | |
1068 | * to switch T-state. If the coordination type is SW_ALL or HW_ALL, | |
1069 | * it is necessary to call it for every affected cpu. Otherwise | |
1070 | * it can be called only for the cpu pointed by pr. | |
1071 | */ | |
1072 | if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) { | |
2fdf66b4 RR |
1073 | /* FIXME: use work_on_cpu() */ |
1074 | set_cpus_allowed_ptr(current, cpumask_of(pr->id)); | |
33a2a529 | 1075 | ret = p_throttling->acpi_processor_set_throttling(pr, |
2a908002 | 1076 | t_state.target_state, force); |
33a2a529 ZY |
1077 | } else { |
1078 | /* | |
1079 | * When the T-state coordination is SW_ALL or HW_ALL, | |
1080 | * it is necessary to set T-state for every affected | |
1081 | * cpus. | |
1082 | */ | |
2fdf66b4 | 1083 | for_each_cpu(i, online_throttling_cpus) { |
706546d0 | 1084 | match_pr = per_cpu(processors, i); |
33a2a529 ZY |
1085 | /* |
1086 | * If the pointer is invalid, we will report the | |
1087 | * error message and continue. | |
1088 | */ | |
1089 | if (!match_pr) { | |
1090 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1091 | "Invalid Pointer for CPU %d\n", i)); | |
1092 | continue; | |
1093 | } | |
1094 | /* | |
1095 | * If the throttling control is unsupported on CPU i, | |
1096 | * we will report the error message and continue. | |
1097 | */ | |
1098 | if (!match_pr->flags.throttling) { | |
1099 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1100 | "Throttling Controll is unsupported " | |
1101 | "on CPU %d\n", i)); | |
1102 | continue; | |
1103 | } | |
1104 | t_state.cpu = i; | |
2fdf66b4 RR |
1105 | /* FIXME: use work_on_cpu() */ |
1106 | set_cpus_allowed_ptr(current, cpumask_of(i)); | |
33a2a529 ZY |
1107 | ret = match_pr->throttling. |
1108 | acpi_processor_set_throttling( | |
2a908002 | 1109 | match_pr, t_state.target_state, force); |
33a2a529 ZY |
1110 | } |
1111 | } | |
1112 | /* | |
1113 | * After the set_throttling is called, the | |
1114 | * throttling notifier is called for every | |
1115 | * affected cpu to update the T-states. | |
1116 | * The notifier event is THROTTLING_POSTCHANGE | |
1117 | */ | |
2fdf66b4 | 1118 | for_each_cpu(i, online_throttling_cpus) { |
33a2a529 ZY |
1119 | t_state.cpu = i; |
1120 | acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE, | |
1121 | &t_state); | |
1122 | } | |
357dc4c3 | 1123 | /* restore the previous state */ |
2fdf66b4 RR |
1124 | /* FIXME: use work_on_cpu() */ |
1125 | set_cpus_allowed_ptr(current, saved_mask); | |
1126 | free_cpumask_var(online_throttling_cpus); | |
1127 | free_cpumask_var(saved_mask); | |
357dc4c3 | 1128 | return ret; |
01854e69 LY |
1129 | } |
1130 | ||
4be44fcd | 1131 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
1da177e4 | 1132 | { |
4be44fcd | 1133 | int result = 0; |
1180509f | 1134 | struct acpi_processor_throttling *pthrottling; |
1da177e4 | 1135 | |
1da177e4 | 1136 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
1137 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
1138 | pr->throttling.address, | |
1139 | pr->throttling.duty_offset, | |
1140 | pr->throttling.duty_width)); | |
1da177e4 | 1141 | |
c30c620e LB |
1142 | /* |
1143 | * Evaluate _PTC, _TSS and _TPC | |
1144 | * They must all be present or none of them can be used. | |
1145 | */ | |
1146 | if (acpi_processor_get_throttling_control(pr) || | |
1147 | acpi_processor_get_throttling_states(pr) || | |
1148 | acpi_processor_get_platform_limit(pr)) | |
1149 | { | |
ff55a9ce LB |
1150 | pr->throttling.acpi_processor_get_throttling = |
1151 | &acpi_processor_get_throttling_fadt; | |
1152 | pr->throttling.acpi_processor_set_throttling = | |
1153 | &acpi_processor_set_throttling_fadt; | |
d1154be3 AS |
1154 | if (acpi_processor_get_fadt_info(pr)) |
1155 | return 0; | |
01854e69 | 1156 | } else { |
ff55a9ce LB |
1157 | pr->throttling.acpi_processor_get_throttling = |
1158 | &acpi_processor_get_throttling_ptc; | |
1159 | pr->throttling.acpi_processor_set_throttling = | |
1160 | &acpi_processor_set_throttling_ptc; | |
01854e69 | 1161 | } |
1da177e4 | 1162 | |
1180509f ZY |
1163 | /* |
1164 | * If TSD package for one CPU can't be parsed successfully, it means | |
1165 | * that this CPU will have no coordination with other CPUs. | |
1166 | */ | |
1167 | if (acpi_processor_get_tsd(pr)) { | |
1168 | pthrottling = &pr->throttling; | |
1169 | pthrottling->tsd_valid_flag = 0; | |
2fdf66b4 | 1170 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
1171 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
1172 | } | |
c30c620e | 1173 | |
1da177e4 LT |
1174 | /* |
1175 | * PIIX4 Errata: We don't support throttling on the original PIIX4. | |
1176 | * This shouldn't be an issue as few (if any) mobile systems ever | |
1177 | * used this part. | |
1178 | */ | |
1179 | if (errata.piix4.throttle) { | |
1180 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 1181 | "Throttling not supported on PIIX4 A- or B-step\n")); |
d550d98d | 1182 | return 0; |
1da177e4 LT |
1183 | } |
1184 | ||
1da177e4 | 1185 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
4be44fcd | 1186 | pr->throttling.state_count)); |
1da177e4 LT |
1187 | |
1188 | pr->flags.throttling = 1; | |
1189 | ||
1190 | /* | |
1191 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. | |
1192 | * thermal) decide to lower performance if it so chooses, but for now | |
1193 | * we'll crank up the speed. | |
1194 | */ | |
1195 | ||
1196 | result = acpi_processor_get_throttling(pr); | |
1197 | if (result) | |
1198 | goto end; | |
1199 | ||
1200 | if (pr->throttling.state) { | |
4be44fcd LB |
1201 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1202 | "Disabling throttling (was T%d)\n", | |
1203 | pr->throttling.state)); | |
2a908002 | 1204 | result = acpi_processor_set_throttling(pr, 0, false); |
1da177e4 LT |
1205 | if (result) |
1206 | goto end; | |
1207 | } | |
1208 | ||
4be44fcd | 1209 | end: |
1da177e4 LT |
1210 | if (result) |
1211 | pr->flags.throttling = 0; | |
1212 | ||
d550d98d | 1213 | return result; |
1da177e4 LT |
1214 | } |
1215 | ||
1da177e4 | 1216 | /* proc interface */ |
74cad4ee | 1217 | #ifdef CONFIG_ACPI_PROCFS |
4be44fcd LB |
1218 | static int acpi_processor_throttling_seq_show(struct seq_file *seq, |
1219 | void *offset) | |
1da177e4 | 1220 | { |
50dd0969 | 1221 | struct acpi_processor *pr = seq->private; |
4be44fcd LB |
1222 | int i = 0; |
1223 | int result = 0; | |
1da177e4 | 1224 | |
1da177e4 LT |
1225 | if (!pr) |
1226 | goto end; | |
1227 | ||
1228 | if (!(pr->throttling.state_count > 0)) { | |
1229 | seq_puts(seq, "<not supported>\n"); | |
1230 | goto end; | |
1231 | } | |
1232 | ||
1233 | result = acpi_processor_get_throttling(pr); | |
1234 | ||
1235 | if (result) { | |
4be44fcd LB |
1236 | seq_puts(seq, |
1237 | "Could not determine current throttling state.\n"); | |
1da177e4 LT |
1238 | goto end; |
1239 | } | |
1240 | ||
1241 | seq_printf(seq, "state count: %d\n" | |
01854e69 | 1242 | "active state: T%d\n" |
ff55a9ce | 1243 | "state available: T%d to T%d\n", |
01854e69 | 1244 | pr->throttling.state_count, pr->throttling.state, |
ff55a9ce LB |
1245 | pr->throttling_platform_limit, |
1246 | pr->throttling.state_count - 1); | |
1da177e4 LT |
1247 | |
1248 | seq_puts(seq, "states:\n"); | |
3cc2649b LY |
1249 | if (pr->throttling.acpi_processor_get_throttling == |
1250 | acpi_processor_get_throttling_fadt) { | |
01854e69 LY |
1251 | for (i = 0; i < pr->throttling.state_count; i++) |
1252 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
1253 | (i == pr->throttling.state ? '*' : ' '), i, |
1254 | (pr->throttling.states[i].performance ? pr-> | |
1255 | throttling.states[i].performance / 10 : 0)); | |
3cc2649b | 1256 | } else { |
01854e69 LY |
1257 | for (i = 0; i < pr->throttling.state_count; i++) |
1258 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
1259 | (i == pr->throttling.state ? '*' : ' '), i, |
1260 | (int)pr->throttling.states_tss[i]. | |
1261 | freqpercentage); | |
3cc2649b | 1262 | } |
1da177e4 | 1263 | |
4be44fcd | 1264 | end: |
d550d98d | 1265 | return 0; |
1da177e4 LT |
1266 | } |
1267 | ||
4be44fcd LB |
1268 | static int acpi_processor_throttling_open_fs(struct inode *inode, |
1269 | struct file *file) | |
1da177e4 LT |
1270 | { |
1271 | return single_open(file, acpi_processor_throttling_seq_show, | |
4be44fcd | 1272 | PDE(inode)->data); |
1da177e4 LT |
1273 | } |
1274 | ||
ff55a9ce | 1275 | static ssize_t acpi_processor_write_throttling(struct file *file, |
757b1866 AB |
1276 | const char __user * buffer, |
1277 | size_t count, loff_t * data) | |
1da177e4 | 1278 | { |
4be44fcd | 1279 | int result = 0; |
50dd0969 JE |
1280 | struct seq_file *m = file->private_data; |
1281 | struct acpi_processor *pr = m->private; | |
3d532d5e YY |
1282 | char state_string[5] = ""; |
1283 | char *charp = NULL; | |
1284 | size_t state_val = 0; | |
1285 | char tmpbuf[5] = ""; | |
1da177e4 | 1286 | |
1da177e4 | 1287 | if (!pr || (count > sizeof(state_string) - 1)) |
d550d98d | 1288 | return -EINVAL; |
1da177e4 LT |
1289 | |
1290 | if (copy_from_user(state_string, buffer, count)) | |
d550d98d | 1291 | return -EFAULT; |
1da177e4 LT |
1292 | |
1293 | state_string[count] = '\0'; | |
3d532d5e YY |
1294 | if ((count > 0) && (state_string[count-1] == '\n')) |
1295 | state_string[count-1] = '\0'; | |
1da177e4 | 1296 | |
3d532d5e YY |
1297 | charp = state_string; |
1298 | if ((state_string[0] == 't') || (state_string[0] == 'T')) | |
1299 | charp++; | |
1300 | ||
1301 | state_val = simple_strtoul(charp, NULL, 0); | |
1302 | if (state_val >= pr->throttling.state_count) | |
1303 | return -EINVAL; | |
1304 | ||
12b2b34e | 1305 | snprintf(tmpbuf, 5, "%zu", state_val); |
3d532d5e YY |
1306 | |
1307 | if (strcmp(tmpbuf, charp) != 0) | |
1308 | return -EINVAL; | |
1309 | ||
2a908002 | 1310 | result = acpi_processor_set_throttling(pr, state_val, false); |
1da177e4 | 1311 | if (result) |
d550d98d | 1312 | return result; |
1da177e4 | 1313 | |
d550d98d | 1314 | return count; |
1da177e4 LT |
1315 | } |
1316 | ||
070d8eb1 | 1317 | const struct file_operations acpi_processor_throttling_fops = { |
cf7acfab | 1318 | .owner = THIS_MODULE, |
4be44fcd LB |
1319 | .open = acpi_processor_throttling_open_fs, |
1320 | .read = seq_read, | |
d479e908 | 1321 | .write = acpi_processor_write_throttling, |
4be44fcd LB |
1322 | .llseek = seq_lseek, |
1323 | .release = single_release, | |
1da177e4 | 1324 | }; |
74cad4ee | 1325 | #endif |