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 | ||
2fdf66b4 RR |
80 | if (!alloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
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 | ||
2fdf66b4 | 108 | cpumask_clear(covered_cpus); |
1180509f | 109 | for_each_possible_cpu(i) { |
706546d0 | 110 | pr = per_cpu(processors, i); |
1180509f ZY |
111 | if (!pr) |
112 | continue; | |
113 | ||
2fdf66b4 | 114 | if (cpumask_test_cpu(i, covered_cpus)) |
1180509f ZY |
115 | continue; |
116 | pthrottling = &pr->throttling; | |
117 | ||
118 | pdomain = &(pthrottling->domain_info); | |
2fdf66b4 RR |
119 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); |
120 | cpumask_set_cpu(i, covered_cpus); | |
1180509f ZY |
121 | /* |
122 | * If the number of processor in the TSD domain is 1, it is | |
123 | * unnecessary to parse the coordination for this CPU. | |
124 | */ | |
125 | if (pdomain->num_processors <= 1) | |
126 | continue; | |
127 | ||
128 | /* Validate the Domain info */ | |
129 | count_target = pdomain->num_processors; | |
130 | count = 1; | |
131 | ||
132 | for_each_possible_cpu(j) { | |
133 | if (i == j) | |
134 | continue; | |
135 | ||
706546d0 | 136 | match_pr = per_cpu(processors, j); |
1180509f ZY |
137 | if (!match_pr) |
138 | continue; | |
139 | ||
140 | match_pthrottling = &(match_pr->throttling); | |
141 | match_pdomain = &(match_pthrottling->domain_info); | |
142 | if (match_pdomain->domain != pdomain->domain) | |
143 | continue; | |
144 | ||
145 | /* Here i and j are in the same domain. | |
146 | * If two TSD packages have the same domain, they | |
147 | * should have the same num_porcessors and | |
148 | * coordination type. Otherwise it will be regarded | |
149 | * as illegal. | |
150 | */ | |
151 | if (match_pdomain->num_processors != count_target) { | |
152 | retval = -EINVAL; | |
153 | goto err_ret; | |
154 | } | |
155 | ||
156 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
157 | retval = -EINVAL; | |
158 | goto err_ret; | |
159 | } | |
160 | ||
2fdf66b4 RR |
161 | cpumask_set_cpu(j, covered_cpus); |
162 | cpumask_set_cpu(j, pthrottling->shared_cpu_map); | |
1180509f ZY |
163 | count++; |
164 | } | |
165 | for_each_possible_cpu(j) { | |
166 | if (i == j) | |
167 | continue; | |
168 | ||
706546d0 | 169 | match_pr = per_cpu(processors, j); |
1180509f ZY |
170 | if (!match_pr) |
171 | continue; | |
172 | ||
173 | match_pthrottling = &(match_pr->throttling); | |
174 | match_pdomain = &(match_pthrottling->domain_info); | |
175 | if (match_pdomain->domain != pdomain->domain) | |
176 | continue; | |
177 | ||
178 | /* | |
179 | * If some CPUS have the same domain, they | |
180 | * will have the same shared_cpu_map. | |
181 | */ | |
2fdf66b4 RR |
182 | cpumask_copy(match_pthrottling->shared_cpu_map, |
183 | pthrottling->shared_cpu_map); | |
1180509f ZY |
184 | } |
185 | } | |
186 | ||
187 | err_ret: | |
2fdf66b4 RR |
188 | free_cpumask_var(covered_cpus); |
189 | ||
1180509f | 190 | for_each_possible_cpu(i) { |
706546d0 | 191 | pr = per_cpu(processors, i); |
1180509f ZY |
192 | if (!pr) |
193 | continue; | |
194 | ||
195 | /* | |
196 | * Assume no coordination on any error parsing domain info. | |
197 | * The coordination type will be forced as SW_ALL. | |
198 | */ | |
199 | if (retval) { | |
200 | pthrottling = &(pr->throttling); | |
2fdf66b4 RR |
201 | cpumask_clear(pthrottling->shared_cpu_map); |
202 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); | |
1180509f ZY |
203 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
204 | } | |
205 | } | |
206 | ||
207 | return retval; | |
208 | } | |
209 | ||
210 | /* | |
211 | * Update the T-state coordination after the _TSD | |
212 | * data for all cpus is obtained. | |
213 | */ | |
214 | void acpi_processor_throttling_init(void) | |
215 | { | |
216 | if (acpi_processor_update_tsd_coord()) | |
217 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
218 | "Assume no T-state coordination\n")); | |
219 | ||
220 | return; | |
221 | } | |
222 | ||
e4aa5cb2 ZY |
223 | static int acpi_processor_throttling_notifier(unsigned long event, void *data) |
224 | { | |
225 | struct throttling_tstate *p_tstate = data; | |
226 | struct acpi_processor *pr; | |
227 | unsigned int cpu ; | |
228 | int target_state; | |
229 | struct acpi_processor_limit *p_limit; | |
230 | struct acpi_processor_throttling *p_throttling; | |
231 | ||
232 | cpu = p_tstate->cpu; | |
706546d0 | 233 | pr = per_cpu(processors, cpu); |
e4aa5cb2 ZY |
234 | if (!pr) { |
235 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n")); | |
236 | return 0; | |
237 | } | |
238 | if (!pr->flags.throttling) { | |
239 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is " | |
240 | "unsupported on CPU %d\n", cpu)); | |
241 | return 0; | |
242 | } | |
243 | target_state = p_tstate->target_state; | |
244 | p_throttling = &(pr->throttling); | |
245 | switch (event) { | |
246 | case THROTTLING_PRECHANGE: | |
247 | /* | |
248 | * Prechange event is used to choose one proper t-state, | |
249 | * which meets the limits of thermal, user and _TPC. | |
250 | */ | |
251 | p_limit = &pr->limit; | |
252 | if (p_limit->thermal.tx > target_state) | |
253 | target_state = p_limit->thermal.tx; | |
254 | if (p_limit->user.tx > target_state) | |
255 | target_state = p_limit->user.tx; | |
256 | if (pr->throttling_platform_limit > target_state) | |
257 | target_state = pr->throttling_platform_limit; | |
258 | if (target_state >= p_throttling->state_count) { | |
259 | printk(KERN_WARNING | |
260 | "Exceed the limit of T-state \n"); | |
261 | target_state = p_throttling->state_count - 1; | |
262 | } | |
263 | p_tstate->target_state = target_state; | |
264 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:" | |
265 | "target T-state of CPU %d is T%d\n", | |
266 | cpu, target_state)); | |
267 | break; | |
268 | case THROTTLING_POSTCHANGE: | |
269 | /* | |
270 | * Postchange event is only used to update the | |
271 | * T-state flag of acpi_processor_throttling. | |
272 | */ | |
273 | p_throttling->state = target_state; | |
274 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:" | |
275 | "CPU %d is switched to T%d\n", | |
276 | cpu, target_state)); | |
277 | break; | |
278 | default: | |
279 | printk(KERN_WARNING | |
280 | "Unsupported Throttling notifier event\n"); | |
281 | break; | |
282 | } | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
c30c620e LB |
287 | /* |
288 | * _TPC - Throttling Present Capabilities | |
289 | */ | |
01854e69 LY |
290 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
291 | { | |
292 | acpi_status status = 0; | |
27663c58 | 293 | unsigned long long tpc = 0; |
01854e69 | 294 | |
ff55a9ce | 295 | if (!pr) |
01854e69 | 296 | return -EINVAL; |
56c213fa ZR |
297 | |
298 | if (ignore_tpc) | |
299 | goto end; | |
300 | ||
01854e69 | 301 | status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); |
c30c620e LB |
302 | if (ACPI_FAILURE(status)) { |
303 | if (status != AE_NOT_FOUND) { | |
304 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC")); | |
305 | } | |
01854e69 LY |
306 | return -ENODEV; |
307 | } | |
56c213fa ZR |
308 | |
309 | end: | |
01854e69 LY |
310 | pr->throttling_platform_limit = (int)tpc; |
311 | return 0; | |
312 | } | |
313 | ||
314 | int acpi_processor_tstate_has_changed(struct acpi_processor *pr) | |
315 | { | |
ef54d5ad ZY |
316 | int result = 0; |
317 | int throttling_limit; | |
318 | int current_state; | |
319 | struct acpi_processor_limit *limit; | |
320 | int target_state; | |
321 | ||
56c213fa ZR |
322 | if (ignore_tpc) |
323 | return 0; | |
324 | ||
ef54d5ad ZY |
325 | result = acpi_processor_get_platform_limit(pr); |
326 | if (result) { | |
327 | /* Throttling Limit is unsupported */ | |
328 | return result; | |
329 | } | |
330 | ||
331 | throttling_limit = pr->throttling_platform_limit; | |
332 | if (throttling_limit >= pr->throttling.state_count) { | |
333 | /* Uncorrect Throttling Limit */ | |
334 | return -EINVAL; | |
335 | } | |
336 | ||
337 | current_state = pr->throttling.state; | |
338 | if (current_state > throttling_limit) { | |
339 | /* | |
340 | * The current state can meet the requirement of | |
341 | * _TPC limit. But it is reasonable that OSPM changes | |
342 | * t-states from high to low for better performance. | |
343 | * Of course the limit condition of thermal | |
344 | * and user should be considered. | |
345 | */ | |
346 | limit = &pr->limit; | |
347 | target_state = throttling_limit; | |
348 | if (limit->thermal.tx > target_state) | |
349 | target_state = limit->thermal.tx; | |
350 | if (limit->user.tx > target_state) | |
351 | target_state = limit->user.tx; | |
352 | } else if (current_state == throttling_limit) { | |
353 | /* | |
354 | * Unnecessary to change the throttling state | |
355 | */ | |
356 | return 0; | |
357 | } else { | |
358 | /* | |
359 | * If the current state is lower than the limit of _TPC, it | |
360 | * will be forced to switch to the throttling state defined | |
361 | * by throttling_platfor_limit. | |
362 | * Because the previous state meets with the limit condition | |
363 | * of thermal and user, it is unnecessary to check it again. | |
364 | */ | |
365 | target_state = throttling_limit; | |
366 | } | |
2a908002 | 367 | return acpi_processor_set_throttling(pr, target_state, false); |
01854e69 LY |
368 | } |
369 | ||
c30c620e LB |
370 | /* |
371 | * _PTC - Processor Throttling Control (and status) register location | |
372 | */ | |
01854e69 LY |
373 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) |
374 | { | |
375 | int result = 0; | |
376 | acpi_status status = 0; | |
377 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
378 | union acpi_object *ptc = NULL; | |
379 | union acpi_object obj = { 0 }; | |
9bcb2721 | 380 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
381 | |
382 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); | |
383 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
384 | if (status != AE_NOT_FOUND) { |
385 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); | |
386 | } | |
01854e69 LY |
387 | return -ENODEV; |
388 | } | |
389 | ||
390 | ptc = (union acpi_object *)buffer.pointer; | |
391 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) | |
392 | || (ptc->package.count != 2)) { | |
393 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); | |
394 | result = -EFAULT; | |
395 | goto end; | |
396 | } | |
397 | ||
398 | /* | |
399 | * control_register | |
400 | */ | |
401 | ||
402 | obj = ptc->package.elements[0]; | |
403 | ||
404 | if ((obj.type != ACPI_TYPE_BUFFER) | |
405 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
406 | || (obj.buffer.pointer == NULL)) { | |
ff55a9ce LB |
407 | printk(KERN_ERR PREFIX |
408 | "Invalid _PTC data (control_register)\n"); | |
01854e69 LY |
409 | result = -EFAULT; |
410 | goto end; | |
411 | } | |
412 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, | |
413 | sizeof(struct acpi_ptc_register)); | |
414 | ||
415 | /* | |
416 | * status_register | |
417 | */ | |
418 | ||
419 | obj = ptc->package.elements[1]; | |
420 | ||
421 | if ((obj.type != ACPI_TYPE_BUFFER) | |
422 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
423 | || (obj.buffer.pointer == NULL)) { | |
424 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); | |
425 | result = -EFAULT; | |
426 | goto end; | |
427 | } | |
428 | ||
429 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, | |
ff55a9ce | 430 | sizeof(struct acpi_ptc_register)); |
01854e69 | 431 | |
9bcb2721 ZY |
432 | throttling = &pr->throttling; |
433 | ||
434 | if ((throttling->control_register.bit_width + | |
435 | throttling->control_register.bit_offset) > 32) { | |
436 | printk(KERN_ERR PREFIX "Invalid _PTC control register\n"); | |
437 | result = -EFAULT; | |
438 | goto end; | |
439 | } | |
440 | ||
441 | if ((throttling->status_register.bit_width + | |
442 | throttling->status_register.bit_offset) > 32) { | |
443 | printk(KERN_ERR PREFIX "Invalid _PTC status register\n"); | |
444 | result = -EFAULT; | |
445 | goto end; | |
446 | } | |
447 | ||
ff55a9ce | 448 | end: |
01854e69 LY |
449 | kfree(buffer.pointer); |
450 | ||
451 | return result; | |
452 | } | |
c30c620e LB |
453 | |
454 | /* | |
455 | * _TSS - Throttling Supported States | |
456 | */ | |
01854e69 LY |
457 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) |
458 | { | |
459 | int result = 0; | |
460 | acpi_status status = AE_OK; | |
461 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
462 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
463 | struct acpi_buffer state = { 0, NULL }; | |
464 | union acpi_object *tss = NULL; | |
465 | int i; | |
466 | ||
467 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); | |
468 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
469 | if (status != AE_NOT_FOUND) { |
470 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); | |
471 | } | |
01854e69 LY |
472 | return -ENODEV; |
473 | } | |
474 | ||
475 | tss = buffer.pointer; | |
476 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { | |
477 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); | |
478 | result = -EFAULT; | |
479 | goto end; | |
480 | } | |
481 | ||
482 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
483 | tss->package.count)); | |
484 | ||
485 | pr->throttling.state_count = tss->package.count; | |
486 | pr->throttling.states_tss = | |
487 | kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count, | |
488 | GFP_KERNEL); | |
489 | if (!pr->throttling.states_tss) { | |
490 | result = -ENOMEM; | |
491 | goto end; | |
492 | } | |
493 | ||
494 | for (i = 0; i < pr->throttling.state_count; i++) { | |
495 | ||
ff55a9ce LB |
496 | struct acpi_processor_tx_tss *tx = |
497 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
498 | states_tss[i]); | |
01854e69 LY |
499 | |
500 | state.length = sizeof(struct acpi_processor_tx_tss); | |
501 | state.pointer = tx; | |
502 | ||
503 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
504 | ||
505 | status = acpi_extract_package(&(tss->package.elements[i]), | |
506 | &format, &state); | |
507 | if (ACPI_FAILURE(status)) { | |
508 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); | |
509 | result = -EFAULT; | |
510 | kfree(pr->throttling.states_tss); | |
511 | goto end; | |
512 | } | |
513 | ||
514 | if (!tx->freqpercentage) { | |
515 | printk(KERN_ERR PREFIX | |
ff55a9ce | 516 | "Invalid _TSS data: freq is zero\n"); |
01854e69 LY |
517 | result = -EFAULT; |
518 | kfree(pr->throttling.states_tss); | |
519 | goto end; | |
520 | } | |
521 | } | |
522 | ||
523 | end: | |
524 | kfree(buffer.pointer); | |
525 | ||
526 | return result; | |
527 | } | |
c30c620e LB |
528 | |
529 | /* | |
530 | * _TSD - T-State Dependencies | |
531 | */ | |
ff55a9ce | 532 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
01854e69 LY |
533 | { |
534 | int result = 0; | |
535 | acpi_status status = AE_OK; | |
ff55a9ce LB |
536 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
537 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
538 | struct acpi_buffer state = { 0, NULL }; | |
539 | union acpi_object *tsd = NULL; | |
01854e69 | 540 | struct acpi_tsd_package *pdomain; |
1180509f ZY |
541 | struct acpi_processor_throttling *pthrottling; |
542 | ||
543 | pthrottling = &pr->throttling; | |
544 | pthrottling->tsd_valid_flag = 0; | |
01854e69 LY |
545 | |
546 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); | |
547 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
548 | if (status != AE_NOT_FOUND) { |
549 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD")); | |
550 | } | |
01854e69 LY |
551 | return -ENODEV; |
552 | } | |
553 | ||
554 | tsd = buffer.pointer; | |
555 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { | |
55ac9a01 | 556 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
557 | result = -EFAULT; |
558 | goto end; | |
559 | } | |
560 | ||
561 | if (tsd->package.count != 1) { | |
55ac9a01 | 562 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
563 | result = -EFAULT; |
564 | goto end; | |
565 | } | |
566 | ||
567 | pdomain = &(pr->throttling.domain_info); | |
568 | ||
569 | state.length = sizeof(struct acpi_tsd_package); | |
570 | state.pointer = pdomain; | |
571 | ||
572 | status = acpi_extract_package(&(tsd->package.elements[0]), | |
ff55a9ce | 573 | &format, &state); |
01854e69 | 574 | if (ACPI_FAILURE(status)) { |
55ac9a01 | 575 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
576 | result = -EFAULT; |
577 | goto end; | |
578 | } | |
579 | ||
580 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { | |
55ac9a01 | 581 | printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n"); |
01854e69 LY |
582 | result = -EFAULT; |
583 | goto end; | |
584 | } | |
585 | ||
586 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { | |
55ac9a01 | 587 | printk(KERN_ERR PREFIX "Unknown _TSD:revision\n"); |
01854e69 LY |
588 | result = -EFAULT; |
589 | goto end; | |
590 | } | |
591 | ||
1180509f ZY |
592 | pthrottling = &pr->throttling; |
593 | pthrottling->tsd_valid_flag = 1; | |
594 | pthrottling->shared_type = pdomain->coord_type; | |
2fdf66b4 | 595 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
596 | /* |
597 | * If the coordination type is not defined in ACPI spec, | |
598 | * the tsd_valid_flag will be clear and coordination type | |
599 | * will be forecd as DOMAIN_COORD_TYPE_SW_ALL. | |
600 | */ | |
601 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
602 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
603 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
604 | pthrottling->tsd_valid_flag = 0; | |
605 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; | |
606 | } | |
607 | ||
ff55a9ce | 608 | end: |
01854e69 LY |
609 | kfree(buffer.pointer); |
610 | return result; | |
611 | } | |
612 | ||
1da177e4 LT |
613 | /* -------------------------------------------------------------------------- |
614 | Throttling Control | |
615 | -------------------------------------------------------------------------- */ | |
01854e69 | 616 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
1da177e4 | 617 | { |
4be44fcd LB |
618 | int state = 0; |
619 | u32 value = 0; | |
620 | u32 duty_mask = 0; | |
621 | u32 duty_value = 0; | |
1da177e4 | 622 | |
1da177e4 | 623 | if (!pr) |
d550d98d | 624 | return -EINVAL; |
1da177e4 LT |
625 | |
626 | if (!pr->flags.throttling) | |
d550d98d | 627 | return -ENODEV; |
1da177e4 LT |
628 | |
629 | pr->throttling.state = 0; | |
630 | ||
631 | duty_mask = pr->throttling.state_count - 1; | |
632 | ||
633 | duty_mask <<= pr->throttling.duty_offset; | |
634 | ||
635 | local_irq_disable(); | |
636 | ||
637 | value = inl(pr->throttling.address); | |
638 | ||
639 | /* | |
640 | * Compute the current throttling state when throttling is enabled | |
641 | * (bit 4 is on). | |
642 | */ | |
643 | if (value & 0x10) { | |
644 | duty_value = value & duty_mask; | |
645 | duty_value >>= pr->throttling.duty_offset; | |
646 | ||
647 | if (duty_value) | |
4be44fcd | 648 | state = pr->throttling.state_count - duty_value; |
1da177e4 LT |
649 | } |
650 | ||
651 | pr->throttling.state = state; | |
652 | ||
653 | local_irq_enable(); | |
654 | ||
655 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
656 | "Throttling state is T%d (%d%% throttling applied)\n", |
657 | state, pr->throttling.states[state].performance)); | |
1da177e4 | 658 | |
d550d98d | 659 | return 0; |
1da177e4 LT |
660 | } |
661 | ||
f79f06ab ZY |
662 | #ifdef CONFIG_X86 |
663 | static int acpi_throttling_rdmsr(struct acpi_processor *pr, | |
664 | acpi_integer * value) | |
665 | { | |
666 | struct cpuinfo_x86 *c; | |
667 | u64 msr_high, msr_low; | |
668 | unsigned int cpu; | |
669 | u64 msr = 0; | |
670 | int ret = -1; | |
671 | ||
672 | cpu = pr->id; | |
673 | c = &cpu_data(cpu); | |
674 | ||
675 | if ((c->x86_vendor != X86_VENDOR_INTEL) || | |
676 | !cpu_has(c, X86_FEATURE_ACPI)) { | |
677 | printk(KERN_ERR PREFIX | |
678 | "HARDWARE addr space,NOT supported yet\n"); | |
679 | } else { | |
680 | msr_low = 0; | |
681 | msr_high = 0; | |
357dc4c3 | 682 | rdmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
683 | (u32 *)&msr_low , (u32 *) &msr_high); |
684 | msr = (msr_high << 32) | msr_low; | |
685 | *value = (acpi_integer) msr; | |
686 | ret = 0; | |
687 | } | |
688 | return ret; | |
689 | } | |
690 | ||
691 | static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value) | |
692 | { | |
693 | struct cpuinfo_x86 *c; | |
694 | unsigned int cpu; | |
695 | int ret = -1; | |
696 | u64 msr; | |
697 | ||
698 | cpu = pr->id; | |
699 | c = &cpu_data(cpu); | |
700 | ||
701 | if ((c->x86_vendor != X86_VENDOR_INTEL) || | |
702 | !cpu_has(c, X86_FEATURE_ACPI)) { | |
703 | printk(KERN_ERR PREFIX | |
704 | "HARDWARE addr space,NOT supported yet\n"); | |
705 | } else { | |
706 | msr = value; | |
357dc4c3 | 707 | wrmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
708 | msr & 0xffffffff, msr >> 32); |
709 | ret = 0; | |
710 | } | |
711 | return ret; | |
712 | } | |
713 | #else | |
714 | static int acpi_throttling_rdmsr(struct acpi_processor *pr, | |
715 | acpi_integer * value) | |
716 | { | |
717 | printk(KERN_ERR PREFIX | |
718 | "HARDWARE addr space,NOT supported yet\n"); | |
719 | return -1; | |
720 | } | |
721 | ||
722 | static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value) | |
723 | { | |
724 | printk(KERN_ERR PREFIX | |
725 | "HARDWARE addr space,NOT supported yet\n"); | |
726 | return -1; | |
727 | } | |
728 | #endif | |
729 | ||
0753f6e0 ZY |
730 | static int acpi_read_throttling_status(struct acpi_processor *pr, |
731 | acpi_integer *value) | |
01854e69 | 732 | { |
9bcb2721 | 733 | u32 bit_width, bit_offset; |
0753f6e0 | 734 | u64 ptc_value; |
9bcb2721 | 735 | u64 ptc_mask; |
0753f6e0 ZY |
736 | struct acpi_processor_throttling *throttling; |
737 | int ret = -1; | |
738 | ||
739 | throttling = &pr->throttling; | |
01854e69 LY |
740 | switch (throttling->status_register.space_id) { |
741 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
0753f6e0 | 742 | ptc_value = 0; |
9bcb2721 ZY |
743 | bit_width = throttling->status_register.bit_width; |
744 | bit_offset = throttling->status_register.bit_offset; | |
745 | ||
ff55a9ce | 746 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
0753f6e0 | 747 | address, (u32 *) &ptc_value, |
9bcb2721 ZY |
748 | (u32) (bit_width + bit_offset)); |
749 | ptc_mask = (1 << bit_width) - 1; | |
750 | *value = (acpi_integer) ((ptc_value >> bit_offset) & ptc_mask); | |
0753f6e0 | 751 | ret = 0; |
01854e69 LY |
752 | break; |
753 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
f79f06ab | 754 | ret = acpi_throttling_rdmsr(pr, value); |
01854e69 LY |
755 | break; |
756 | default: | |
757 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 758 | (u32) (throttling->status_register.space_id)); |
01854e69 | 759 | } |
0753f6e0 | 760 | return ret; |
01854e69 LY |
761 | } |
762 | ||
0753f6e0 ZY |
763 | static int acpi_write_throttling_state(struct acpi_processor *pr, |
764 | acpi_integer value) | |
01854e69 | 765 | { |
9bcb2721 | 766 | u32 bit_width, bit_offset; |
0753f6e0 | 767 | u64 ptc_value; |
9bcb2721 | 768 | u64 ptc_mask; |
0753f6e0 | 769 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
770 | int ret = -1; |
771 | ||
0753f6e0 | 772 | throttling = &pr->throttling; |
01854e69 LY |
773 | switch (throttling->control_register.space_id) { |
774 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
775 | bit_width = throttling->control_register.bit_width; |
776 | bit_offset = throttling->control_register.bit_offset; | |
777 | ptc_mask = (1 << bit_width) - 1; | |
778 | ptc_value = value & ptc_mask; | |
779 | ||
ff55a9ce | 780 | acpi_os_write_port((acpi_io_address) throttling-> |
9bcb2721 ZY |
781 | control_register.address, |
782 | (u32) (ptc_value << bit_offset), | |
783 | (u32) (bit_width + bit_offset)); | |
01854e69 LY |
784 | ret = 0; |
785 | break; | |
786 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
f79f06ab | 787 | ret = acpi_throttling_wrmsr(pr, value); |
01854e69 LY |
788 | break; |
789 | default: | |
790 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 791 | (u32) (throttling->control_register.space_id)); |
01854e69 LY |
792 | } |
793 | return ret; | |
794 | } | |
795 | ||
0753f6e0 ZY |
796 | static int acpi_get_throttling_state(struct acpi_processor *pr, |
797 | acpi_integer value) | |
01854e69 LY |
798 | { |
799 | int i; | |
800 | ||
801 | for (i = 0; i < pr->throttling.state_count; i++) { | |
ff55a9ce LB |
802 | struct acpi_processor_tx_tss *tx = |
803 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
804 | states_tss[i]); | |
805 | if (tx->control == value) | |
53af9cfb | 806 | return i; |
01854e69 | 807 | } |
53af9cfb | 808 | return -1; |
01854e69 LY |
809 | } |
810 | ||
0753f6e0 ZY |
811 | static int acpi_get_throttling_value(struct acpi_processor *pr, |
812 | int state, acpi_integer *value) | |
01854e69 | 813 | { |
0753f6e0 ZY |
814 | int ret = -1; |
815 | ||
ff55a9ce LB |
816 | if (state >= 0 && state <= pr->throttling.state_count) { |
817 | struct acpi_processor_tx_tss *tx = | |
818 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
819 | states_tss[state]); | |
0753f6e0 ZY |
820 | *value = tx->control; |
821 | ret = 0; | |
01854e69 | 822 | } |
0753f6e0 | 823 | return ret; |
01854e69 LY |
824 | } |
825 | ||
826 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) | |
827 | { | |
828 | int state = 0; | |
0753f6e0 ZY |
829 | int ret; |
830 | acpi_integer value; | |
01854e69 | 831 | |
01854e69 LY |
832 | if (!pr) |
833 | return -EINVAL; | |
834 | ||
835 | if (!pr->flags.throttling) | |
836 | return -ENODEV; | |
837 | ||
838 | pr->throttling.state = 0; | |
357dc4c3 | 839 | |
0753f6e0 ZY |
840 | value = 0; |
841 | ret = acpi_read_throttling_status(pr, &value); | |
842 | if (ret >= 0) { | |
ff55a9ce | 843 | state = acpi_get_throttling_state(pr, value); |
4973b22a | 844 | if (state == -1) { |
bdf57de4 FP |
845 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
846 | "Invalid throttling state, reset\n")); | |
4973b22a | 847 | state = 0; |
2a908002 | 848 | ret = acpi_processor_set_throttling(pr, state, true); |
4973b22a ZR |
849 | if (ret) |
850 | return ret; | |
851 | } | |
01854e69 LY |
852 | pr->throttling.state = state; |
853 | } | |
01854e69 LY |
854 | |
855 | return 0; | |
856 | } | |
857 | ||
01854e69 LY |
858 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
859 | { | |
2fdf66b4 | 860 | cpumask_var_t saved_mask; |
357dc4c3 ZY |
861 | int ret; |
862 | ||
87654273 ZY |
863 | if (!pr) |
864 | return -EINVAL; | |
865 | ||
866 | if (!pr->flags.throttling) | |
867 | return -ENODEV; | |
2fdf66b4 RR |
868 | |
869 | if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL)) | |
870 | return -ENOMEM; | |
871 | ||
357dc4c3 ZY |
872 | /* |
873 | * Migrate task to the cpu pointed by pr. | |
874 | */ | |
2fdf66b4 RR |
875 | cpumask_copy(saved_mask, ¤t->cpus_allowed); |
876 | /* FIXME: use work_on_cpu() */ | |
877 | set_cpus_allowed_ptr(current, cpumask_of(pr->id)); | |
357dc4c3 ZY |
878 | ret = pr->throttling.acpi_processor_get_throttling(pr); |
879 | /* restore the previous state */ | |
2fdf66b4 RR |
880 | set_cpus_allowed_ptr(current, saved_mask); |
881 | free_cpumask_var(saved_mask); | |
357dc4c3 ZY |
882 | |
883 | return ret; | |
01854e69 LY |
884 | } |
885 | ||
22cc5019 ZY |
886 | static int acpi_processor_get_fadt_info(struct acpi_processor *pr) |
887 | { | |
888 | int i, step; | |
889 | ||
890 | if (!pr->throttling.address) { | |
891 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); | |
892 | return -EINVAL; | |
893 | } else if (!pr->throttling.duty_width) { | |
894 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); | |
895 | return -EINVAL; | |
896 | } | |
897 | /* TBD: Support duty_cycle values that span bit 4. */ | |
898 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { | |
899 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); | |
900 | return -EINVAL; | |
901 | } | |
902 | ||
903 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; | |
904 | ||
905 | /* | |
906 | * Compute state values. Note that throttling displays a linear power | |
907 | * performance relationship (at 50% performance the CPU will consume | |
908 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. | |
909 | */ | |
910 | ||
911 | step = (1000 / pr->throttling.state_count); | |
912 | ||
913 | for (i = 0; i < pr->throttling.state_count; i++) { | |
914 | pr->throttling.states[i].performance = 1000 - step * i; | |
915 | pr->throttling.states[i].power = 1000 - step * i; | |
916 | } | |
917 | return 0; | |
918 | } | |
919 | ||
6c5cf8aa | 920 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
2a908002 | 921 | int state, bool force) |
1da177e4 | 922 | { |
4be44fcd LB |
923 | u32 value = 0; |
924 | u32 duty_mask = 0; | |
925 | u32 duty_value = 0; | |
1da177e4 | 926 | |
1da177e4 | 927 | if (!pr) |
d550d98d | 928 | return -EINVAL; |
1da177e4 LT |
929 | |
930 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
d550d98d | 931 | return -EINVAL; |
1da177e4 LT |
932 | |
933 | if (!pr->flags.throttling) | |
d550d98d | 934 | return -ENODEV; |
1da177e4 | 935 | |
2a908002 | 936 | if (!force && (state == pr->throttling.state)) |
d550d98d | 937 | return 0; |
1da177e4 | 938 | |
01854e69 LY |
939 | if (state < pr->throttling_platform_limit) |
940 | return -EPERM; | |
1da177e4 LT |
941 | /* |
942 | * Calculate the duty_value and duty_mask. | |
943 | */ | |
944 | if (state) { | |
945 | duty_value = pr->throttling.state_count - state; | |
946 | ||
947 | duty_value <<= pr->throttling.duty_offset; | |
948 | ||
949 | /* Used to clear all duty_value bits */ | |
950 | duty_mask = pr->throttling.state_count - 1; | |
951 | ||
cee324b1 | 952 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
1da177e4 LT |
953 | duty_mask = ~duty_mask; |
954 | } | |
955 | ||
956 | local_irq_disable(); | |
957 | ||
958 | /* | |
959 | * Disable throttling by writing a 0 to bit 4. Note that we must | |
960 | * turn it off before you can change the duty_value. | |
961 | */ | |
962 | value = inl(pr->throttling.address); | |
963 | if (value & 0x10) { | |
964 | value &= 0xFFFFFFEF; | |
965 | outl(value, pr->throttling.address); | |
966 | } | |
967 | ||
968 | /* | |
969 | * Write the new duty_value and then enable throttling. Note | |
970 | * that a state value of 0 leaves throttling disabled. | |
971 | */ | |
972 | if (state) { | |
973 | value &= duty_mask; | |
974 | value |= duty_value; | |
975 | outl(value, pr->throttling.address); | |
976 | ||
977 | value |= 0x00000010; | |
978 | outl(value, pr->throttling.address); | |
979 | } | |
980 | ||
981 | pr->throttling.state = state; | |
982 | ||
983 | local_irq_enable(); | |
984 | ||
985 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
986 | "Throttling state set to T%d (%d%%)\n", state, |
987 | (pr->throttling.states[state].performance ? pr-> | |
988 | throttling.states[state].performance / 10 : 0))); | |
1da177e4 | 989 | |
d550d98d | 990 | return 0; |
1da177e4 LT |
991 | } |
992 | ||
6c5cf8aa | 993 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
2a908002 | 994 | int state, bool force) |
01854e69 | 995 | { |
0753f6e0 ZY |
996 | int ret; |
997 | acpi_integer value; | |
01854e69 LY |
998 | |
999 | if (!pr) | |
1000 | return -EINVAL; | |
1001 | ||
1002 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1003 | return -EINVAL; | |
1004 | ||
1005 | if (!pr->flags.throttling) | |
1006 | return -ENODEV; | |
1007 | ||
2a908002 | 1008 | if (!force && (state == pr->throttling.state)) |
01854e69 LY |
1009 | return 0; |
1010 | ||
1011 | if (state < pr->throttling_platform_limit) | |
1012 | return -EPERM; | |
1013 | ||
0753f6e0 ZY |
1014 | value = 0; |
1015 | ret = acpi_get_throttling_value(pr, state, &value); | |
1016 | if (ret >= 0) { | |
1017 | acpi_write_throttling_state(pr, value); | |
01854e69 LY |
1018 | pr->throttling.state = state; |
1019 | } | |
01854e69 LY |
1020 | |
1021 | return 0; | |
1022 | } | |
1023 | ||
2a908002 FP |
1024 | int acpi_processor_set_throttling(struct acpi_processor *pr, |
1025 | int state, bool force) | |
01854e69 | 1026 | { |
2fdf66b4 | 1027 | cpumask_var_t saved_mask; |
3391a76f | 1028 | int ret = 0; |
33a2a529 ZY |
1029 | unsigned int i; |
1030 | struct acpi_processor *match_pr; | |
1031 | struct acpi_processor_throttling *p_throttling; | |
1032 | struct throttling_tstate t_state; | |
2fdf66b4 | 1033 | cpumask_var_t online_throttling_cpus; |
87654273 ZY |
1034 | |
1035 | if (!pr) | |
1036 | return -EINVAL; | |
1037 | ||
1038 | if (!pr->flags.throttling) | |
1039 | return -ENODEV; | |
1040 | ||
1041 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1042 | return -EINVAL; | |
1043 | ||
2fdf66b4 RR |
1044 | if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL)) |
1045 | return -ENOMEM; | |
1046 | ||
1047 | if (!alloc_cpumask_var(&online_throttling_cpus, GFP_KERNEL)) { | |
1048 | free_cpumask_var(saved_mask); | |
1049 | return -ENOMEM; | |
1050 | } | |
1051 | ||
1052 | cpumask_copy(saved_mask, ¤t->cpus_allowed); | |
33a2a529 ZY |
1053 | t_state.target_state = state; |
1054 | p_throttling = &(pr->throttling); | |
2fdf66b4 RR |
1055 | cpumask_and(online_throttling_cpus, cpu_online_mask, |
1056 | p_throttling->shared_cpu_map); | |
357dc4c3 | 1057 | /* |
33a2a529 ZY |
1058 | * The throttling notifier will be called for every |
1059 | * affected cpu in order to get one proper T-state. | |
1060 | * The notifier event is THROTTLING_PRECHANGE. | |
357dc4c3 | 1061 | */ |
2fdf66b4 | 1062 | for_each_cpu(i, online_throttling_cpus) { |
33a2a529 ZY |
1063 | t_state.cpu = i; |
1064 | acpi_processor_throttling_notifier(THROTTLING_PRECHANGE, | |
1065 | &t_state); | |
1066 | } | |
1067 | /* | |
1068 | * The function of acpi_processor_set_throttling will be called | |
1069 | * to switch T-state. If the coordination type is SW_ALL or HW_ALL, | |
1070 | * it is necessary to call it for every affected cpu. Otherwise | |
1071 | * it can be called only for the cpu pointed by pr. | |
1072 | */ | |
1073 | if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) { | |
2fdf66b4 RR |
1074 | /* FIXME: use work_on_cpu() */ |
1075 | set_cpus_allowed_ptr(current, cpumask_of(pr->id)); | |
33a2a529 | 1076 | ret = p_throttling->acpi_processor_set_throttling(pr, |
2a908002 | 1077 | t_state.target_state, force); |
33a2a529 ZY |
1078 | } else { |
1079 | /* | |
1080 | * When the T-state coordination is SW_ALL or HW_ALL, | |
1081 | * it is necessary to set T-state for every affected | |
1082 | * cpus. | |
1083 | */ | |
2fdf66b4 | 1084 | for_each_cpu(i, online_throttling_cpus) { |
706546d0 | 1085 | match_pr = per_cpu(processors, i); |
33a2a529 ZY |
1086 | /* |
1087 | * If the pointer is invalid, we will report the | |
1088 | * error message and continue. | |
1089 | */ | |
1090 | if (!match_pr) { | |
1091 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1092 | "Invalid Pointer for CPU %d\n", i)); | |
1093 | continue; | |
1094 | } | |
1095 | /* | |
1096 | * If the throttling control is unsupported on CPU i, | |
1097 | * we will report the error message and continue. | |
1098 | */ | |
1099 | if (!match_pr->flags.throttling) { | |
1100 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1101 | "Throttling Controll is unsupported " | |
1102 | "on CPU %d\n", i)); | |
1103 | continue; | |
1104 | } | |
1105 | t_state.cpu = i; | |
2fdf66b4 RR |
1106 | /* FIXME: use work_on_cpu() */ |
1107 | set_cpus_allowed_ptr(current, cpumask_of(i)); | |
33a2a529 ZY |
1108 | ret = match_pr->throttling. |
1109 | acpi_processor_set_throttling( | |
2a908002 | 1110 | match_pr, t_state.target_state, force); |
33a2a529 ZY |
1111 | } |
1112 | } | |
1113 | /* | |
1114 | * After the set_throttling is called, the | |
1115 | * throttling notifier is called for every | |
1116 | * affected cpu to update the T-states. | |
1117 | * The notifier event is THROTTLING_POSTCHANGE | |
1118 | */ | |
2fdf66b4 | 1119 | for_each_cpu(i, online_throttling_cpus) { |
33a2a529 ZY |
1120 | t_state.cpu = i; |
1121 | acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE, | |
1122 | &t_state); | |
1123 | } | |
357dc4c3 | 1124 | /* restore the previous state */ |
2fdf66b4 RR |
1125 | /* FIXME: use work_on_cpu() */ |
1126 | set_cpus_allowed_ptr(current, saved_mask); | |
1127 | free_cpumask_var(online_throttling_cpus); | |
1128 | free_cpumask_var(saved_mask); | |
357dc4c3 | 1129 | return ret; |
01854e69 LY |
1130 | } |
1131 | ||
4be44fcd | 1132 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
1da177e4 | 1133 | { |
4be44fcd | 1134 | int result = 0; |
1180509f | 1135 | struct acpi_processor_throttling *pthrottling; |
1da177e4 | 1136 | |
1da177e4 | 1137 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
1138 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
1139 | pr->throttling.address, | |
1140 | pr->throttling.duty_offset, | |
1141 | pr->throttling.duty_width)); | |
1da177e4 LT |
1142 | |
1143 | if (!pr) | |
d550d98d | 1144 | return -EINVAL; |
1da177e4 | 1145 | |
c30c620e LB |
1146 | /* |
1147 | * Evaluate _PTC, _TSS and _TPC | |
1148 | * They must all be present or none of them can be used. | |
1149 | */ | |
1150 | if (acpi_processor_get_throttling_control(pr) || | |
1151 | acpi_processor_get_throttling_states(pr) || | |
1152 | acpi_processor_get_platform_limit(pr)) | |
1153 | { | |
ff55a9ce LB |
1154 | pr->throttling.acpi_processor_get_throttling = |
1155 | &acpi_processor_get_throttling_fadt; | |
1156 | pr->throttling.acpi_processor_set_throttling = | |
1157 | &acpi_processor_set_throttling_fadt; | |
d1154be3 AS |
1158 | if (acpi_processor_get_fadt_info(pr)) |
1159 | return 0; | |
01854e69 | 1160 | } else { |
ff55a9ce LB |
1161 | pr->throttling.acpi_processor_get_throttling = |
1162 | &acpi_processor_get_throttling_ptc; | |
1163 | pr->throttling.acpi_processor_set_throttling = | |
1164 | &acpi_processor_set_throttling_ptc; | |
01854e69 | 1165 | } |
1da177e4 | 1166 | |
1180509f ZY |
1167 | /* |
1168 | * If TSD package for one CPU can't be parsed successfully, it means | |
1169 | * that this CPU will have no coordination with other CPUs. | |
1170 | */ | |
1171 | if (acpi_processor_get_tsd(pr)) { | |
1172 | pthrottling = &pr->throttling; | |
1173 | pthrottling->tsd_valid_flag = 0; | |
2fdf66b4 | 1174 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
1175 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
1176 | } | |
c30c620e | 1177 | |
1da177e4 LT |
1178 | /* |
1179 | * PIIX4 Errata: We don't support throttling on the original PIIX4. | |
1180 | * This shouldn't be an issue as few (if any) mobile systems ever | |
1181 | * used this part. | |
1182 | */ | |
1183 | if (errata.piix4.throttle) { | |
1184 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 1185 | "Throttling not supported on PIIX4 A- or B-step\n")); |
d550d98d | 1186 | return 0; |
1da177e4 LT |
1187 | } |
1188 | ||
1da177e4 | 1189 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
4be44fcd | 1190 | pr->throttling.state_count)); |
1da177e4 LT |
1191 | |
1192 | pr->flags.throttling = 1; | |
1193 | ||
1194 | /* | |
1195 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. | |
1196 | * thermal) decide to lower performance if it so chooses, but for now | |
1197 | * we'll crank up the speed. | |
1198 | */ | |
1199 | ||
1200 | result = acpi_processor_get_throttling(pr); | |
1201 | if (result) | |
1202 | goto end; | |
1203 | ||
1204 | if (pr->throttling.state) { | |
4be44fcd LB |
1205 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1206 | "Disabling throttling (was T%d)\n", | |
1207 | pr->throttling.state)); | |
2a908002 | 1208 | result = acpi_processor_set_throttling(pr, 0, false); |
1da177e4 LT |
1209 | if (result) |
1210 | goto end; | |
1211 | } | |
1212 | ||
4be44fcd | 1213 | end: |
1da177e4 LT |
1214 | if (result) |
1215 | pr->flags.throttling = 0; | |
1216 | ||
d550d98d | 1217 | return result; |
1da177e4 LT |
1218 | } |
1219 | ||
1da177e4 LT |
1220 | /* proc interface */ |
1221 | ||
4be44fcd LB |
1222 | static int acpi_processor_throttling_seq_show(struct seq_file *seq, |
1223 | void *offset) | |
1da177e4 | 1224 | { |
50dd0969 | 1225 | struct acpi_processor *pr = seq->private; |
4be44fcd LB |
1226 | int i = 0; |
1227 | int result = 0; | |
1da177e4 | 1228 | |
1da177e4 LT |
1229 | if (!pr) |
1230 | goto end; | |
1231 | ||
1232 | if (!(pr->throttling.state_count > 0)) { | |
1233 | seq_puts(seq, "<not supported>\n"); | |
1234 | goto end; | |
1235 | } | |
1236 | ||
1237 | result = acpi_processor_get_throttling(pr); | |
1238 | ||
1239 | if (result) { | |
4be44fcd LB |
1240 | seq_puts(seq, |
1241 | "Could not determine current throttling state.\n"); | |
1da177e4 LT |
1242 | goto end; |
1243 | } | |
1244 | ||
1245 | seq_printf(seq, "state count: %d\n" | |
01854e69 | 1246 | "active state: T%d\n" |
ff55a9ce | 1247 | "state available: T%d to T%d\n", |
01854e69 | 1248 | pr->throttling.state_count, pr->throttling.state, |
ff55a9ce LB |
1249 | pr->throttling_platform_limit, |
1250 | pr->throttling.state_count - 1); | |
1da177e4 LT |
1251 | |
1252 | seq_puts(seq, "states:\n"); | |
3cc2649b LY |
1253 | if (pr->throttling.acpi_processor_get_throttling == |
1254 | acpi_processor_get_throttling_fadt) { | |
01854e69 LY |
1255 | for (i = 0; i < pr->throttling.state_count; i++) |
1256 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
1257 | (i == pr->throttling.state ? '*' : ' '), i, |
1258 | (pr->throttling.states[i].performance ? pr-> | |
1259 | throttling.states[i].performance / 10 : 0)); | |
3cc2649b | 1260 | } else { |
01854e69 LY |
1261 | for (i = 0; i < pr->throttling.state_count; i++) |
1262 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
1263 | (i == pr->throttling.state ? '*' : ' '), i, |
1264 | (int)pr->throttling.states_tss[i]. | |
1265 | freqpercentage); | |
3cc2649b | 1266 | } |
1da177e4 | 1267 | |
4be44fcd | 1268 | end: |
d550d98d | 1269 | return 0; |
1da177e4 LT |
1270 | } |
1271 | ||
4be44fcd LB |
1272 | static int acpi_processor_throttling_open_fs(struct inode *inode, |
1273 | struct file *file) | |
1da177e4 LT |
1274 | { |
1275 | return single_open(file, acpi_processor_throttling_seq_show, | |
4be44fcd | 1276 | PDE(inode)->data); |
1da177e4 LT |
1277 | } |
1278 | ||
ff55a9ce | 1279 | static ssize_t acpi_processor_write_throttling(struct file *file, |
757b1866 AB |
1280 | const char __user * buffer, |
1281 | size_t count, loff_t * data) | |
1da177e4 | 1282 | { |
4be44fcd | 1283 | int result = 0; |
50dd0969 JE |
1284 | struct seq_file *m = file->private_data; |
1285 | struct acpi_processor *pr = m->private; | |
3d532d5e YY |
1286 | char state_string[5] = ""; |
1287 | char *charp = NULL; | |
1288 | size_t state_val = 0; | |
1289 | char tmpbuf[5] = ""; | |
1da177e4 | 1290 | |
1da177e4 | 1291 | if (!pr || (count > sizeof(state_string) - 1)) |
d550d98d | 1292 | return -EINVAL; |
1da177e4 LT |
1293 | |
1294 | if (copy_from_user(state_string, buffer, count)) | |
d550d98d | 1295 | return -EFAULT; |
1da177e4 LT |
1296 | |
1297 | state_string[count] = '\0'; | |
3d532d5e YY |
1298 | if ((count > 0) && (state_string[count-1] == '\n')) |
1299 | state_string[count-1] = '\0'; | |
1da177e4 | 1300 | |
3d532d5e YY |
1301 | charp = state_string; |
1302 | if ((state_string[0] == 't') || (state_string[0] == 'T')) | |
1303 | charp++; | |
1304 | ||
1305 | state_val = simple_strtoul(charp, NULL, 0); | |
1306 | if (state_val >= pr->throttling.state_count) | |
1307 | return -EINVAL; | |
1308 | ||
12b2b34e | 1309 | snprintf(tmpbuf, 5, "%zu", state_val); |
3d532d5e YY |
1310 | |
1311 | if (strcmp(tmpbuf, charp) != 0) | |
1312 | return -EINVAL; | |
1313 | ||
2a908002 | 1314 | result = acpi_processor_set_throttling(pr, state_val, false); |
1da177e4 | 1315 | if (result) |
d550d98d | 1316 | return result; |
1da177e4 | 1317 | |
d550d98d | 1318 | return count; |
1da177e4 LT |
1319 | } |
1320 | ||
070d8eb1 | 1321 | const struct file_operations acpi_processor_throttling_fops = { |
cf7acfab | 1322 | .owner = THIS_MODULE, |
4be44fcd LB |
1323 | .open = acpi_processor_throttling_open_fs, |
1324 | .read = seq_read, | |
d479e908 | 1325 | .write = acpi_processor_write_throttling, |
4be44fcd LB |
1326 | .llseek = seq_lseek, |
1327 | .release = single_release, | |
1da177e4 | 1328 | }; |