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 | ||
1da177e4 | 44 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 | 45 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
f52fd66d | 46 | ACPI_MODULE_NAME("processor_throttling"); |
1da177e4 | 47 | |
56c213fa ZR |
48 | /* ignore_tpc: |
49 | * 0 -> acpi processor driver doesn't ignore _TPC values | |
50 | * 1 -> acpi processor driver ignores _TPC values | |
51 | */ | |
52 | static int ignore_tpc; | |
53 | module_param(ignore_tpc, int, 0644); | |
54 | MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support"); | |
55 | ||
e4aa5cb2 ZY |
56 | struct throttling_tstate { |
57 | unsigned int cpu; /* cpu nr */ | |
58 | int target_state; /* target T-state */ | |
59 | }; | |
60 | ||
61 | #define THROTTLING_PRECHANGE (1) | |
62 | #define THROTTLING_POSTCHANGE (2) | |
63 | ||
ff55a9ce | 64 | static int acpi_processor_get_throttling(struct acpi_processor *pr); |
2a908002 FP |
65 | int acpi_processor_set_throttling(struct acpi_processor *pr, |
66 | int state, bool force); | |
01854e69 | 67 | |
1180509f ZY |
68 | static int acpi_processor_update_tsd_coord(void) |
69 | { | |
70 | int count, count_target; | |
71 | int retval = 0; | |
72 | unsigned int i, j; | |
2fdf66b4 | 73 | cpumask_var_t covered_cpus; |
1180509f ZY |
74 | struct acpi_processor *pr, *match_pr; |
75 | struct acpi_tsd_package *pdomain, *match_pdomain; | |
76 | struct acpi_processor_throttling *pthrottling, *match_pthrottling; | |
77 | ||
2fdf66b4 RR |
78 | if (!alloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
79 | return -ENOMEM; | |
80 | ||
1180509f ZY |
81 | /* |
82 | * Now that we have _TSD data from all CPUs, lets setup T-state | |
33a2a529 | 83 | * coordination between all CPUs. |
1180509f ZY |
84 | */ |
85 | for_each_possible_cpu(i) { | |
706546d0 | 86 | pr = per_cpu(processors, i); |
1180509f ZY |
87 | if (!pr) |
88 | continue; | |
89 | ||
90 | /* Basic validity check for domain info */ | |
91 | pthrottling = &(pr->throttling); | |
92 | ||
93 | /* | |
94 | * If tsd package for one cpu is invalid, the coordination | |
95 | * among all CPUs is thought as invalid. | |
96 | * Maybe it is ugly. | |
97 | */ | |
98 | if (!pthrottling->tsd_valid_flag) { | |
99 | retval = -EINVAL; | |
100 | break; | |
101 | } | |
102 | } | |
103 | if (retval) | |
104 | goto err_ret; | |
105 | ||
2fdf66b4 | 106 | cpumask_clear(covered_cpus); |
1180509f | 107 | for_each_possible_cpu(i) { |
706546d0 | 108 | pr = per_cpu(processors, i); |
1180509f ZY |
109 | if (!pr) |
110 | continue; | |
111 | ||
2fdf66b4 | 112 | if (cpumask_test_cpu(i, covered_cpus)) |
1180509f ZY |
113 | continue; |
114 | pthrottling = &pr->throttling; | |
115 | ||
116 | pdomain = &(pthrottling->domain_info); | |
2fdf66b4 RR |
117 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); |
118 | cpumask_set_cpu(i, covered_cpus); | |
1180509f ZY |
119 | /* |
120 | * If the number of processor in the TSD domain is 1, it is | |
121 | * unnecessary to parse the coordination for this CPU. | |
122 | */ | |
123 | if (pdomain->num_processors <= 1) | |
124 | continue; | |
125 | ||
126 | /* Validate the Domain info */ | |
127 | count_target = pdomain->num_processors; | |
128 | count = 1; | |
129 | ||
130 | for_each_possible_cpu(j) { | |
131 | if (i == j) | |
132 | continue; | |
133 | ||
706546d0 | 134 | match_pr = per_cpu(processors, j); |
1180509f ZY |
135 | if (!match_pr) |
136 | continue; | |
137 | ||
138 | match_pthrottling = &(match_pr->throttling); | |
139 | match_pdomain = &(match_pthrottling->domain_info); | |
140 | if (match_pdomain->domain != pdomain->domain) | |
141 | continue; | |
142 | ||
143 | /* Here i and j are in the same domain. | |
144 | * If two TSD packages have the same domain, they | |
145 | * should have the same num_porcessors and | |
146 | * coordination type. Otherwise it will be regarded | |
147 | * as illegal. | |
148 | */ | |
149 | if (match_pdomain->num_processors != count_target) { | |
150 | retval = -EINVAL; | |
151 | goto err_ret; | |
152 | } | |
153 | ||
154 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
155 | retval = -EINVAL; | |
156 | goto err_ret; | |
157 | } | |
158 | ||
2fdf66b4 RR |
159 | cpumask_set_cpu(j, covered_cpus); |
160 | cpumask_set_cpu(j, pthrottling->shared_cpu_map); | |
1180509f ZY |
161 | count++; |
162 | } | |
163 | for_each_possible_cpu(j) { | |
164 | if (i == j) | |
165 | continue; | |
166 | ||
706546d0 | 167 | match_pr = per_cpu(processors, j); |
1180509f ZY |
168 | if (!match_pr) |
169 | continue; | |
170 | ||
171 | match_pthrottling = &(match_pr->throttling); | |
172 | match_pdomain = &(match_pthrottling->domain_info); | |
173 | if (match_pdomain->domain != pdomain->domain) | |
174 | continue; | |
175 | ||
176 | /* | |
177 | * If some CPUS have the same domain, they | |
178 | * will have the same shared_cpu_map. | |
179 | */ | |
2fdf66b4 RR |
180 | cpumask_copy(match_pthrottling->shared_cpu_map, |
181 | pthrottling->shared_cpu_map); | |
1180509f ZY |
182 | } |
183 | } | |
184 | ||
185 | err_ret: | |
2fdf66b4 RR |
186 | free_cpumask_var(covered_cpus); |
187 | ||
1180509f | 188 | for_each_possible_cpu(i) { |
706546d0 | 189 | pr = per_cpu(processors, i); |
1180509f ZY |
190 | if (!pr) |
191 | continue; | |
192 | ||
193 | /* | |
194 | * Assume no coordination on any error parsing domain info. | |
195 | * The coordination type will be forced as SW_ALL. | |
196 | */ | |
197 | if (retval) { | |
198 | pthrottling = &(pr->throttling); | |
2fdf66b4 RR |
199 | cpumask_clear(pthrottling->shared_cpu_map); |
200 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); | |
1180509f ZY |
201 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
202 | } | |
203 | } | |
204 | ||
205 | return retval; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Update the T-state coordination after the _TSD | |
210 | * data for all cpus is obtained. | |
211 | */ | |
212 | void acpi_processor_throttling_init(void) | |
213 | { | |
214 | if (acpi_processor_update_tsd_coord()) | |
215 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
216 | "Assume no T-state coordination\n")); | |
217 | ||
218 | return; | |
219 | } | |
220 | ||
e4aa5cb2 ZY |
221 | static int acpi_processor_throttling_notifier(unsigned long event, void *data) |
222 | { | |
223 | struct throttling_tstate *p_tstate = data; | |
224 | struct acpi_processor *pr; | |
225 | unsigned int cpu ; | |
226 | int target_state; | |
227 | struct acpi_processor_limit *p_limit; | |
228 | struct acpi_processor_throttling *p_throttling; | |
229 | ||
230 | cpu = p_tstate->cpu; | |
706546d0 | 231 | pr = per_cpu(processors, cpu); |
e4aa5cb2 ZY |
232 | if (!pr) { |
233 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n")); | |
234 | return 0; | |
235 | } | |
236 | if (!pr->flags.throttling) { | |
237 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is " | |
238 | "unsupported on CPU %d\n", cpu)); | |
239 | return 0; | |
240 | } | |
241 | target_state = p_tstate->target_state; | |
242 | p_throttling = &(pr->throttling); | |
243 | switch (event) { | |
244 | case THROTTLING_PRECHANGE: | |
245 | /* | |
246 | * Prechange event is used to choose one proper t-state, | |
247 | * which meets the limits of thermal, user and _TPC. | |
248 | */ | |
249 | p_limit = &pr->limit; | |
250 | if (p_limit->thermal.tx > target_state) | |
251 | target_state = p_limit->thermal.tx; | |
252 | if (p_limit->user.tx > target_state) | |
253 | target_state = p_limit->user.tx; | |
254 | if (pr->throttling_platform_limit > target_state) | |
255 | target_state = pr->throttling_platform_limit; | |
256 | if (target_state >= p_throttling->state_count) { | |
257 | printk(KERN_WARNING | |
258 | "Exceed the limit of T-state \n"); | |
259 | target_state = p_throttling->state_count - 1; | |
260 | } | |
261 | p_tstate->target_state = target_state; | |
262 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:" | |
263 | "target T-state of CPU %d is T%d\n", | |
264 | cpu, target_state)); | |
265 | break; | |
266 | case THROTTLING_POSTCHANGE: | |
267 | /* | |
268 | * Postchange event is only used to update the | |
269 | * T-state flag of acpi_processor_throttling. | |
270 | */ | |
271 | p_throttling->state = target_state; | |
272 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:" | |
273 | "CPU %d is switched to T%d\n", | |
274 | cpu, target_state)); | |
275 | break; | |
276 | default: | |
277 | printk(KERN_WARNING | |
278 | "Unsupported Throttling notifier event\n"); | |
279 | break; | |
280 | } | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
c30c620e LB |
285 | /* |
286 | * _TPC - Throttling Present Capabilities | |
287 | */ | |
01854e69 LY |
288 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
289 | { | |
290 | acpi_status status = 0; | |
27663c58 | 291 | unsigned long long tpc = 0; |
01854e69 | 292 | |
ff55a9ce | 293 | if (!pr) |
01854e69 | 294 | return -EINVAL; |
56c213fa ZR |
295 | |
296 | if (ignore_tpc) | |
297 | goto end; | |
298 | ||
01854e69 | 299 | status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); |
c30c620e LB |
300 | if (ACPI_FAILURE(status)) { |
301 | if (status != AE_NOT_FOUND) { | |
302 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC")); | |
303 | } | |
01854e69 LY |
304 | return -ENODEV; |
305 | } | |
56c213fa ZR |
306 | |
307 | end: | |
01854e69 LY |
308 | pr->throttling_platform_limit = (int)tpc; |
309 | return 0; | |
310 | } | |
311 | ||
312 | int acpi_processor_tstate_has_changed(struct acpi_processor *pr) | |
313 | { | |
ef54d5ad ZY |
314 | int result = 0; |
315 | int throttling_limit; | |
316 | int current_state; | |
317 | struct acpi_processor_limit *limit; | |
318 | int target_state; | |
319 | ||
56c213fa ZR |
320 | if (ignore_tpc) |
321 | return 0; | |
322 | ||
ef54d5ad ZY |
323 | result = acpi_processor_get_platform_limit(pr); |
324 | if (result) { | |
325 | /* Throttling Limit is unsupported */ | |
326 | return result; | |
327 | } | |
328 | ||
329 | throttling_limit = pr->throttling_platform_limit; | |
330 | if (throttling_limit >= pr->throttling.state_count) { | |
331 | /* Uncorrect Throttling Limit */ | |
332 | return -EINVAL; | |
333 | } | |
334 | ||
335 | current_state = pr->throttling.state; | |
336 | if (current_state > throttling_limit) { | |
337 | /* | |
338 | * The current state can meet the requirement of | |
339 | * _TPC limit. But it is reasonable that OSPM changes | |
340 | * t-states from high to low for better performance. | |
341 | * Of course the limit condition of thermal | |
342 | * and user should be considered. | |
343 | */ | |
344 | limit = &pr->limit; | |
345 | target_state = throttling_limit; | |
346 | if (limit->thermal.tx > target_state) | |
347 | target_state = limit->thermal.tx; | |
348 | if (limit->user.tx > target_state) | |
349 | target_state = limit->user.tx; | |
350 | } else if (current_state == throttling_limit) { | |
351 | /* | |
352 | * Unnecessary to change the throttling state | |
353 | */ | |
354 | return 0; | |
355 | } else { | |
356 | /* | |
357 | * If the current state is lower than the limit of _TPC, it | |
358 | * will be forced to switch to the throttling state defined | |
359 | * by throttling_platfor_limit. | |
360 | * Because the previous state meets with the limit condition | |
361 | * of thermal and user, it is unnecessary to check it again. | |
362 | */ | |
363 | target_state = throttling_limit; | |
364 | } | |
2a908002 | 365 | return acpi_processor_set_throttling(pr, target_state, false); |
01854e69 LY |
366 | } |
367 | ||
c30c620e LB |
368 | /* |
369 | * _PTC - Processor Throttling Control (and status) register location | |
370 | */ | |
01854e69 LY |
371 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) |
372 | { | |
373 | int result = 0; | |
374 | acpi_status status = 0; | |
375 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
376 | union acpi_object *ptc = NULL; | |
377 | union acpi_object obj = { 0 }; | |
9bcb2721 | 378 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
379 | |
380 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); | |
381 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
382 | if (status != AE_NOT_FOUND) { |
383 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); | |
384 | } | |
01854e69 LY |
385 | return -ENODEV; |
386 | } | |
387 | ||
388 | ptc = (union acpi_object *)buffer.pointer; | |
389 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) | |
390 | || (ptc->package.count != 2)) { | |
391 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); | |
392 | result = -EFAULT; | |
393 | goto end; | |
394 | } | |
395 | ||
396 | /* | |
397 | * control_register | |
398 | */ | |
399 | ||
400 | obj = ptc->package.elements[0]; | |
401 | ||
402 | if ((obj.type != ACPI_TYPE_BUFFER) | |
403 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
404 | || (obj.buffer.pointer == NULL)) { | |
ff55a9ce LB |
405 | printk(KERN_ERR PREFIX |
406 | "Invalid _PTC data (control_register)\n"); | |
01854e69 LY |
407 | result = -EFAULT; |
408 | goto end; | |
409 | } | |
410 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, | |
411 | sizeof(struct acpi_ptc_register)); | |
412 | ||
413 | /* | |
414 | * status_register | |
415 | */ | |
416 | ||
417 | obj = ptc->package.elements[1]; | |
418 | ||
419 | if ((obj.type != ACPI_TYPE_BUFFER) | |
420 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
421 | || (obj.buffer.pointer == NULL)) { | |
422 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); | |
423 | result = -EFAULT; | |
424 | goto end; | |
425 | } | |
426 | ||
427 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, | |
ff55a9ce | 428 | sizeof(struct acpi_ptc_register)); |
01854e69 | 429 | |
9bcb2721 ZY |
430 | throttling = &pr->throttling; |
431 | ||
432 | if ((throttling->control_register.bit_width + | |
433 | throttling->control_register.bit_offset) > 32) { | |
434 | printk(KERN_ERR PREFIX "Invalid _PTC control register\n"); | |
435 | result = -EFAULT; | |
436 | goto end; | |
437 | } | |
438 | ||
439 | if ((throttling->status_register.bit_width + | |
440 | throttling->status_register.bit_offset) > 32) { | |
441 | printk(KERN_ERR PREFIX "Invalid _PTC status register\n"); | |
442 | result = -EFAULT; | |
443 | goto end; | |
444 | } | |
445 | ||
ff55a9ce | 446 | end: |
01854e69 LY |
447 | kfree(buffer.pointer); |
448 | ||
449 | return result; | |
450 | } | |
c30c620e LB |
451 | |
452 | /* | |
453 | * _TSS - Throttling Supported States | |
454 | */ | |
01854e69 LY |
455 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) |
456 | { | |
457 | int result = 0; | |
458 | acpi_status status = AE_OK; | |
459 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
460 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
461 | struct acpi_buffer state = { 0, NULL }; | |
462 | union acpi_object *tss = NULL; | |
463 | int i; | |
464 | ||
465 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); | |
466 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
467 | if (status != AE_NOT_FOUND) { |
468 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); | |
469 | } | |
01854e69 LY |
470 | return -ENODEV; |
471 | } | |
472 | ||
473 | tss = buffer.pointer; | |
474 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { | |
475 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); | |
476 | result = -EFAULT; | |
477 | goto end; | |
478 | } | |
479 | ||
480 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
481 | tss->package.count)); | |
482 | ||
483 | pr->throttling.state_count = tss->package.count; | |
484 | pr->throttling.states_tss = | |
485 | kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count, | |
486 | GFP_KERNEL); | |
487 | if (!pr->throttling.states_tss) { | |
488 | result = -ENOMEM; | |
489 | goto end; | |
490 | } | |
491 | ||
492 | for (i = 0; i < pr->throttling.state_count; i++) { | |
493 | ||
ff55a9ce LB |
494 | struct acpi_processor_tx_tss *tx = |
495 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
496 | states_tss[i]); | |
01854e69 LY |
497 | |
498 | state.length = sizeof(struct acpi_processor_tx_tss); | |
499 | state.pointer = tx; | |
500 | ||
501 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
502 | ||
503 | status = acpi_extract_package(&(tss->package.elements[i]), | |
504 | &format, &state); | |
505 | if (ACPI_FAILURE(status)) { | |
506 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); | |
507 | result = -EFAULT; | |
508 | kfree(pr->throttling.states_tss); | |
509 | goto end; | |
510 | } | |
511 | ||
512 | if (!tx->freqpercentage) { | |
513 | printk(KERN_ERR PREFIX | |
ff55a9ce | 514 | "Invalid _TSS data: freq is zero\n"); |
01854e69 LY |
515 | result = -EFAULT; |
516 | kfree(pr->throttling.states_tss); | |
517 | goto end; | |
518 | } | |
519 | } | |
520 | ||
521 | end: | |
522 | kfree(buffer.pointer); | |
523 | ||
524 | return result; | |
525 | } | |
c30c620e LB |
526 | |
527 | /* | |
528 | * _TSD - T-State Dependencies | |
529 | */ | |
ff55a9ce | 530 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
01854e69 LY |
531 | { |
532 | int result = 0; | |
533 | acpi_status status = AE_OK; | |
ff55a9ce LB |
534 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
535 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
536 | struct acpi_buffer state = { 0, NULL }; | |
537 | union acpi_object *tsd = NULL; | |
01854e69 | 538 | struct acpi_tsd_package *pdomain; |
1180509f ZY |
539 | struct acpi_processor_throttling *pthrottling; |
540 | ||
541 | pthrottling = &pr->throttling; | |
542 | pthrottling->tsd_valid_flag = 0; | |
01854e69 LY |
543 | |
544 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); | |
545 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
546 | if (status != AE_NOT_FOUND) { |
547 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD")); | |
548 | } | |
01854e69 LY |
549 | return -ENODEV; |
550 | } | |
551 | ||
552 | tsd = buffer.pointer; | |
553 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { | |
55ac9a01 | 554 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
555 | result = -EFAULT; |
556 | goto end; | |
557 | } | |
558 | ||
559 | if (tsd->package.count != 1) { | |
55ac9a01 | 560 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
561 | result = -EFAULT; |
562 | goto end; | |
563 | } | |
564 | ||
565 | pdomain = &(pr->throttling.domain_info); | |
566 | ||
567 | state.length = sizeof(struct acpi_tsd_package); | |
568 | state.pointer = pdomain; | |
569 | ||
570 | status = acpi_extract_package(&(tsd->package.elements[0]), | |
ff55a9ce | 571 | &format, &state); |
01854e69 | 572 | if (ACPI_FAILURE(status)) { |
55ac9a01 | 573 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
574 | result = -EFAULT; |
575 | goto end; | |
576 | } | |
577 | ||
578 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { | |
55ac9a01 | 579 | printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n"); |
01854e69 LY |
580 | result = -EFAULT; |
581 | goto end; | |
582 | } | |
583 | ||
584 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { | |
55ac9a01 | 585 | printk(KERN_ERR PREFIX "Unknown _TSD:revision\n"); |
01854e69 LY |
586 | result = -EFAULT; |
587 | goto end; | |
588 | } | |
589 | ||
1180509f ZY |
590 | pthrottling = &pr->throttling; |
591 | pthrottling->tsd_valid_flag = 1; | |
592 | pthrottling->shared_type = pdomain->coord_type; | |
2fdf66b4 | 593 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
594 | /* |
595 | * If the coordination type is not defined in ACPI spec, | |
596 | * the tsd_valid_flag will be clear and coordination type | |
597 | * will be forecd as DOMAIN_COORD_TYPE_SW_ALL. | |
598 | */ | |
599 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
600 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
601 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
602 | pthrottling->tsd_valid_flag = 0; | |
603 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; | |
604 | } | |
605 | ||
ff55a9ce | 606 | end: |
01854e69 LY |
607 | kfree(buffer.pointer); |
608 | return result; | |
609 | } | |
610 | ||
1da177e4 LT |
611 | /* -------------------------------------------------------------------------- |
612 | Throttling Control | |
613 | -------------------------------------------------------------------------- */ | |
01854e69 | 614 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
1da177e4 | 615 | { |
4be44fcd LB |
616 | int state = 0; |
617 | u32 value = 0; | |
618 | u32 duty_mask = 0; | |
619 | u32 duty_value = 0; | |
1da177e4 | 620 | |
1da177e4 | 621 | if (!pr) |
d550d98d | 622 | return -EINVAL; |
1da177e4 LT |
623 | |
624 | if (!pr->flags.throttling) | |
d550d98d | 625 | return -ENODEV; |
1da177e4 LT |
626 | |
627 | pr->throttling.state = 0; | |
628 | ||
629 | duty_mask = pr->throttling.state_count - 1; | |
630 | ||
631 | duty_mask <<= pr->throttling.duty_offset; | |
632 | ||
633 | local_irq_disable(); | |
634 | ||
635 | value = inl(pr->throttling.address); | |
636 | ||
637 | /* | |
638 | * Compute the current throttling state when throttling is enabled | |
639 | * (bit 4 is on). | |
640 | */ | |
641 | if (value & 0x10) { | |
642 | duty_value = value & duty_mask; | |
643 | duty_value >>= pr->throttling.duty_offset; | |
644 | ||
645 | if (duty_value) | |
4be44fcd | 646 | state = pr->throttling.state_count - duty_value; |
1da177e4 LT |
647 | } |
648 | ||
649 | pr->throttling.state = state; | |
650 | ||
651 | local_irq_enable(); | |
652 | ||
653 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
654 | "Throttling state is T%d (%d%% throttling applied)\n", |
655 | state, pr->throttling.states[state].performance)); | |
1da177e4 | 656 | |
d550d98d | 657 | return 0; |
1da177e4 LT |
658 | } |
659 | ||
f79f06ab ZY |
660 | #ifdef CONFIG_X86 |
661 | static int acpi_throttling_rdmsr(struct acpi_processor *pr, | |
662 | acpi_integer * value) | |
663 | { | |
664 | struct cpuinfo_x86 *c; | |
665 | u64 msr_high, msr_low; | |
666 | unsigned int cpu; | |
667 | u64 msr = 0; | |
668 | int ret = -1; | |
669 | ||
670 | cpu = pr->id; | |
671 | c = &cpu_data(cpu); | |
672 | ||
673 | if ((c->x86_vendor != X86_VENDOR_INTEL) || | |
674 | !cpu_has(c, X86_FEATURE_ACPI)) { | |
675 | printk(KERN_ERR PREFIX | |
676 | "HARDWARE addr space,NOT supported yet\n"); | |
677 | } else { | |
678 | msr_low = 0; | |
679 | msr_high = 0; | |
357dc4c3 | 680 | rdmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
681 | (u32 *)&msr_low , (u32 *) &msr_high); |
682 | msr = (msr_high << 32) | msr_low; | |
683 | *value = (acpi_integer) msr; | |
684 | ret = 0; | |
685 | } | |
686 | return ret; | |
687 | } | |
688 | ||
689 | static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value) | |
690 | { | |
691 | struct cpuinfo_x86 *c; | |
692 | unsigned int cpu; | |
693 | int ret = -1; | |
694 | u64 msr; | |
695 | ||
696 | cpu = pr->id; | |
697 | c = &cpu_data(cpu); | |
698 | ||
699 | if ((c->x86_vendor != X86_VENDOR_INTEL) || | |
700 | !cpu_has(c, X86_FEATURE_ACPI)) { | |
701 | printk(KERN_ERR PREFIX | |
702 | "HARDWARE addr space,NOT supported yet\n"); | |
703 | } else { | |
704 | msr = value; | |
357dc4c3 | 705 | wrmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
706 | msr & 0xffffffff, msr >> 32); |
707 | ret = 0; | |
708 | } | |
709 | return ret; | |
710 | } | |
711 | #else | |
712 | static int acpi_throttling_rdmsr(struct acpi_processor *pr, | |
713 | acpi_integer * value) | |
714 | { | |
715 | printk(KERN_ERR PREFIX | |
716 | "HARDWARE addr space,NOT supported yet\n"); | |
717 | return -1; | |
718 | } | |
719 | ||
720 | static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value) | |
721 | { | |
722 | printk(KERN_ERR PREFIX | |
723 | "HARDWARE addr space,NOT supported yet\n"); | |
724 | return -1; | |
725 | } | |
726 | #endif | |
727 | ||
0753f6e0 ZY |
728 | static int acpi_read_throttling_status(struct acpi_processor *pr, |
729 | acpi_integer *value) | |
01854e69 | 730 | { |
9bcb2721 | 731 | u32 bit_width, bit_offset; |
0753f6e0 | 732 | u64 ptc_value; |
9bcb2721 | 733 | u64 ptc_mask; |
0753f6e0 ZY |
734 | struct acpi_processor_throttling *throttling; |
735 | int ret = -1; | |
736 | ||
737 | throttling = &pr->throttling; | |
01854e69 LY |
738 | switch (throttling->status_register.space_id) { |
739 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
0753f6e0 | 740 | ptc_value = 0; |
9bcb2721 ZY |
741 | bit_width = throttling->status_register.bit_width; |
742 | bit_offset = throttling->status_register.bit_offset; | |
743 | ||
ff55a9ce | 744 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
0753f6e0 | 745 | address, (u32 *) &ptc_value, |
9bcb2721 ZY |
746 | (u32) (bit_width + bit_offset)); |
747 | ptc_mask = (1 << bit_width) - 1; | |
748 | *value = (acpi_integer) ((ptc_value >> bit_offset) & ptc_mask); | |
0753f6e0 | 749 | ret = 0; |
01854e69 LY |
750 | break; |
751 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
f79f06ab | 752 | ret = acpi_throttling_rdmsr(pr, value); |
01854e69 LY |
753 | break; |
754 | default: | |
755 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 756 | (u32) (throttling->status_register.space_id)); |
01854e69 | 757 | } |
0753f6e0 | 758 | return ret; |
01854e69 LY |
759 | } |
760 | ||
0753f6e0 ZY |
761 | static int acpi_write_throttling_state(struct acpi_processor *pr, |
762 | acpi_integer value) | |
01854e69 | 763 | { |
9bcb2721 | 764 | u32 bit_width, bit_offset; |
0753f6e0 | 765 | u64 ptc_value; |
9bcb2721 | 766 | u64 ptc_mask; |
0753f6e0 | 767 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
768 | int ret = -1; |
769 | ||
0753f6e0 | 770 | throttling = &pr->throttling; |
01854e69 LY |
771 | switch (throttling->control_register.space_id) { |
772 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
773 | bit_width = throttling->control_register.bit_width; |
774 | bit_offset = throttling->control_register.bit_offset; | |
775 | ptc_mask = (1 << bit_width) - 1; | |
776 | ptc_value = value & ptc_mask; | |
777 | ||
ff55a9ce | 778 | acpi_os_write_port((acpi_io_address) throttling-> |
9bcb2721 ZY |
779 | control_register.address, |
780 | (u32) (ptc_value << bit_offset), | |
781 | (u32) (bit_width + bit_offset)); | |
01854e69 LY |
782 | ret = 0; |
783 | break; | |
784 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
f79f06ab | 785 | ret = acpi_throttling_wrmsr(pr, value); |
01854e69 LY |
786 | break; |
787 | default: | |
788 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 789 | (u32) (throttling->control_register.space_id)); |
01854e69 LY |
790 | } |
791 | return ret; | |
792 | } | |
793 | ||
0753f6e0 ZY |
794 | static int acpi_get_throttling_state(struct acpi_processor *pr, |
795 | acpi_integer value) | |
01854e69 LY |
796 | { |
797 | int i; | |
798 | ||
799 | for (i = 0; i < pr->throttling.state_count; i++) { | |
ff55a9ce LB |
800 | struct acpi_processor_tx_tss *tx = |
801 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
802 | states_tss[i]); | |
803 | if (tx->control == value) | |
53af9cfb | 804 | return i; |
01854e69 | 805 | } |
53af9cfb | 806 | return -1; |
01854e69 LY |
807 | } |
808 | ||
0753f6e0 ZY |
809 | static int acpi_get_throttling_value(struct acpi_processor *pr, |
810 | int state, acpi_integer *value) | |
01854e69 | 811 | { |
0753f6e0 ZY |
812 | int ret = -1; |
813 | ||
ff55a9ce LB |
814 | if (state >= 0 && state <= pr->throttling.state_count) { |
815 | struct acpi_processor_tx_tss *tx = | |
816 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
817 | states_tss[state]); | |
0753f6e0 ZY |
818 | *value = tx->control; |
819 | ret = 0; | |
01854e69 | 820 | } |
0753f6e0 | 821 | return ret; |
01854e69 LY |
822 | } |
823 | ||
824 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) | |
825 | { | |
826 | int state = 0; | |
0753f6e0 ZY |
827 | int ret; |
828 | acpi_integer value; | |
01854e69 | 829 | |
01854e69 LY |
830 | if (!pr) |
831 | return -EINVAL; | |
832 | ||
833 | if (!pr->flags.throttling) | |
834 | return -ENODEV; | |
835 | ||
836 | pr->throttling.state = 0; | |
357dc4c3 | 837 | |
0753f6e0 ZY |
838 | value = 0; |
839 | ret = acpi_read_throttling_status(pr, &value); | |
840 | if (ret >= 0) { | |
ff55a9ce | 841 | state = acpi_get_throttling_state(pr, value); |
4973b22a | 842 | if (state == -1) { |
bdf57de4 FP |
843 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
844 | "Invalid throttling state, reset\n")); | |
4973b22a | 845 | state = 0; |
2a908002 | 846 | ret = acpi_processor_set_throttling(pr, state, true); |
4973b22a ZR |
847 | if (ret) |
848 | return ret; | |
849 | } | |
01854e69 LY |
850 | pr->throttling.state = state; |
851 | } | |
01854e69 LY |
852 | |
853 | return 0; | |
854 | } | |
855 | ||
01854e69 LY |
856 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
857 | { | |
2fdf66b4 | 858 | cpumask_var_t saved_mask; |
357dc4c3 ZY |
859 | int ret; |
860 | ||
87654273 ZY |
861 | if (!pr) |
862 | return -EINVAL; | |
863 | ||
864 | if (!pr->flags.throttling) | |
865 | return -ENODEV; | |
2fdf66b4 RR |
866 | |
867 | if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL)) | |
868 | return -ENOMEM; | |
869 | ||
357dc4c3 ZY |
870 | /* |
871 | * Migrate task to the cpu pointed by pr. | |
872 | */ | |
2fdf66b4 RR |
873 | cpumask_copy(saved_mask, ¤t->cpus_allowed); |
874 | /* FIXME: use work_on_cpu() */ | |
875 | set_cpus_allowed_ptr(current, cpumask_of(pr->id)); | |
357dc4c3 ZY |
876 | ret = pr->throttling.acpi_processor_get_throttling(pr); |
877 | /* restore the previous state */ | |
2fdf66b4 RR |
878 | set_cpus_allowed_ptr(current, saved_mask); |
879 | free_cpumask_var(saved_mask); | |
357dc4c3 ZY |
880 | |
881 | return ret; | |
01854e69 LY |
882 | } |
883 | ||
22cc5019 ZY |
884 | static int acpi_processor_get_fadt_info(struct acpi_processor *pr) |
885 | { | |
886 | int i, step; | |
887 | ||
888 | if (!pr->throttling.address) { | |
889 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); | |
890 | return -EINVAL; | |
891 | } else if (!pr->throttling.duty_width) { | |
892 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); | |
893 | return -EINVAL; | |
894 | } | |
895 | /* TBD: Support duty_cycle values that span bit 4. */ | |
896 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { | |
897 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); | |
898 | return -EINVAL; | |
899 | } | |
900 | ||
901 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; | |
902 | ||
903 | /* | |
904 | * Compute state values. Note that throttling displays a linear power | |
905 | * performance relationship (at 50% performance the CPU will consume | |
906 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. | |
907 | */ | |
908 | ||
909 | step = (1000 / pr->throttling.state_count); | |
910 | ||
911 | for (i = 0; i < pr->throttling.state_count; i++) { | |
912 | pr->throttling.states[i].performance = 1000 - step * i; | |
913 | pr->throttling.states[i].power = 1000 - step * i; | |
914 | } | |
915 | return 0; | |
916 | } | |
917 | ||
6c5cf8aa | 918 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
2a908002 | 919 | int state, bool force) |
1da177e4 | 920 | { |
4be44fcd LB |
921 | u32 value = 0; |
922 | u32 duty_mask = 0; | |
923 | u32 duty_value = 0; | |
1da177e4 | 924 | |
1da177e4 | 925 | if (!pr) |
d550d98d | 926 | return -EINVAL; |
1da177e4 LT |
927 | |
928 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
d550d98d | 929 | return -EINVAL; |
1da177e4 LT |
930 | |
931 | if (!pr->flags.throttling) | |
d550d98d | 932 | return -ENODEV; |
1da177e4 | 933 | |
2a908002 | 934 | if (!force && (state == pr->throttling.state)) |
d550d98d | 935 | return 0; |
1da177e4 | 936 | |
01854e69 LY |
937 | if (state < pr->throttling_platform_limit) |
938 | return -EPERM; | |
1da177e4 LT |
939 | /* |
940 | * Calculate the duty_value and duty_mask. | |
941 | */ | |
942 | if (state) { | |
943 | duty_value = pr->throttling.state_count - state; | |
944 | ||
945 | duty_value <<= pr->throttling.duty_offset; | |
946 | ||
947 | /* Used to clear all duty_value bits */ | |
948 | duty_mask = pr->throttling.state_count - 1; | |
949 | ||
cee324b1 | 950 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
1da177e4 LT |
951 | duty_mask = ~duty_mask; |
952 | } | |
953 | ||
954 | local_irq_disable(); | |
955 | ||
956 | /* | |
957 | * Disable throttling by writing a 0 to bit 4. Note that we must | |
958 | * turn it off before you can change the duty_value. | |
959 | */ | |
960 | value = inl(pr->throttling.address); | |
961 | if (value & 0x10) { | |
962 | value &= 0xFFFFFFEF; | |
963 | outl(value, pr->throttling.address); | |
964 | } | |
965 | ||
966 | /* | |
967 | * Write the new duty_value and then enable throttling. Note | |
968 | * that a state value of 0 leaves throttling disabled. | |
969 | */ | |
970 | if (state) { | |
971 | value &= duty_mask; | |
972 | value |= duty_value; | |
973 | outl(value, pr->throttling.address); | |
974 | ||
975 | value |= 0x00000010; | |
976 | outl(value, pr->throttling.address); | |
977 | } | |
978 | ||
979 | pr->throttling.state = state; | |
980 | ||
981 | local_irq_enable(); | |
982 | ||
983 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
984 | "Throttling state set to T%d (%d%%)\n", state, |
985 | (pr->throttling.states[state].performance ? pr-> | |
986 | throttling.states[state].performance / 10 : 0))); | |
1da177e4 | 987 | |
d550d98d | 988 | return 0; |
1da177e4 LT |
989 | } |
990 | ||
6c5cf8aa | 991 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
2a908002 | 992 | int state, bool force) |
01854e69 | 993 | { |
0753f6e0 ZY |
994 | int ret; |
995 | acpi_integer value; | |
01854e69 LY |
996 | |
997 | if (!pr) | |
998 | return -EINVAL; | |
999 | ||
1000 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1001 | return -EINVAL; | |
1002 | ||
1003 | if (!pr->flags.throttling) | |
1004 | return -ENODEV; | |
1005 | ||
2a908002 | 1006 | if (!force && (state == pr->throttling.state)) |
01854e69 LY |
1007 | return 0; |
1008 | ||
1009 | if (state < pr->throttling_platform_limit) | |
1010 | return -EPERM; | |
1011 | ||
0753f6e0 ZY |
1012 | value = 0; |
1013 | ret = acpi_get_throttling_value(pr, state, &value); | |
1014 | if (ret >= 0) { | |
1015 | acpi_write_throttling_state(pr, value); | |
01854e69 LY |
1016 | pr->throttling.state = state; |
1017 | } | |
01854e69 LY |
1018 | |
1019 | return 0; | |
1020 | } | |
1021 | ||
2a908002 FP |
1022 | int acpi_processor_set_throttling(struct acpi_processor *pr, |
1023 | int state, bool force) | |
01854e69 | 1024 | { |
2fdf66b4 | 1025 | cpumask_var_t saved_mask; |
3391a76f | 1026 | int ret = 0; |
33a2a529 ZY |
1027 | unsigned int i; |
1028 | struct acpi_processor *match_pr; | |
1029 | struct acpi_processor_throttling *p_throttling; | |
1030 | struct throttling_tstate t_state; | |
2fdf66b4 | 1031 | cpumask_var_t online_throttling_cpus; |
87654273 ZY |
1032 | |
1033 | if (!pr) | |
1034 | return -EINVAL; | |
1035 | ||
1036 | if (!pr->flags.throttling) | |
1037 | return -ENODEV; | |
1038 | ||
1039 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1040 | return -EINVAL; | |
1041 | ||
2fdf66b4 RR |
1042 | if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL)) |
1043 | return -ENOMEM; | |
1044 | ||
1045 | if (!alloc_cpumask_var(&online_throttling_cpus, GFP_KERNEL)) { | |
1046 | free_cpumask_var(saved_mask); | |
1047 | return -ENOMEM; | |
1048 | } | |
1049 | ||
1050 | cpumask_copy(saved_mask, ¤t->cpus_allowed); | |
33a2a529 ZY |
1051 | t_state.target_state = state; |
1052 | p_throttling = &(pr->throttling); | |
2fdf66b4 RR |
1053 | cpumask_and(online_throttling_cpus, cpu_online_mask, |
1054 | p_throttling->shared_cpu_map); | |
357dc4c3 | 1055 | /* |
33a2a529 ZY |
1056 | * The throttling notifier will be called for every |
1057 | * affected cpu in order to get one proper T-state. | |
1058 | * The notifier event is THROTTLING_PRECHANGE. | |
357dc4c3 | 1059 | */ |
2fdf66b4 | 1060 | for_each_cpu(i, online_throttling_cpus) { |
33a2a529 ZY |
1061 | t_state.cpu = i; |
1062 | acpi_processor_throttling_notifier(THROTTLING_PRECHANGE, | |
1063 | &t_state); | |
1064 | } | |
1065 | /* | |
1066 | * The function of acpi_processor_set_throttling will be called | |
1067 | * to switch T-state. If the coordination type is SW_ALL or HW_ALL, | |
1068 | * it is necessary to call it for every affected cpu. Otherwise | |
1069 | * it can be called only for the cpu pointed by pr. | |
1070 | */ | |
1071 | if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) { | |
2fdf66b4 RR |
1072 | /* FIXME: use work_on_cpu() */ |
1073 | set_cpus_allowed_ptr(current, cpumask_of(pr->id)); | |
33a2a529 | 1074 | ret = p_throttling->acpi_processor_set_throttling(pr, |
2a908002 | 1075 | t_state.target_state, force); |
33a2a529 ZY |
1076 | } else { |
1077 | /* | |
1078 | * When the T-state coordination is SW_ALL or HW_ALL, | |
1079 | * it is necessary to set T-state for every affected | |
1080 | * cpus. | |
1081 | */ | |
2fdf66b4 | 1082 | for_each_cpu(i, online_throttling_cpus) { |
706546d0 | 1083 | match_pr = per_cpu(processors, i); |
33a2a529 ZY |
1084 | /* |
1085 | * If the pointer is invalid, we will report the | |
1086 | * error message and continue. | |
1087 | */ | |
1088 | if (!match_pr) { | |
1089 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1090 | "Invalid Pointer for CPU %d\n", i)); | |
1091 | continue; | |
1092 | } | |
1093 | /* | |
1094 | * If the throttling control is unsupported on CPU i, | |
1095 | * we will report the error message and continue. | |
1096 | */ | |
1097 | if (!match_pr->flags.throttling) { | |
1098 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1099 | "Throttling Controll is unsupported " | |
1100 | "on CPU %d\n", i)); | |
1101 | continue; | |
1102 | } | |
1103 | t_state.cpu = i; | |
2fdf66b4 RR |
1104 | /* FIXME: use work_on_cpu() */ |
1105 | set_cpus_allowed_ptr(current, cpumask_of(i)); | |
33a2a529 ZY |
1106 | ret = match_pr->throttling. |
1107 | acpi_processor_set_throttling( | |
2a908002 | 1108 | match_pr, t_state.target_state, force); |
33a2a529 ZY |
1109 | } |
1110 | } | |
1111 | /* | |
1112 | * After the set_throttling is called, the | |
1113 | * throttling notifier is called for every | |
1114 | * affected cpu to update the T-states. | |
1115 | * The notifier event is THROTTLING_POSTCHANGE | |
1116 | */ | |
2fdf66b4 | 1117 | for_each_cpu(i, online_throttling_cpus) { |
33a2a529 ZY |
1118 | t_state.cpu = i; |
1119 | acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE, | |
1120 | &t_state); | |
1121 | } | |
357dc4c3 | 1122 | /* restore the previous state */ |
2fdf66b4 RR |
1123 | /* FIXME: use work_on_cpu() */ |
1124 | set_cpus_allowed_ptr(current, saved_mask); | |
1125 | free_cpumask_var(online_throttling_cpus); | |
1126 | free_cpumask_var(saved_mask); | |
357dc4c3 | 1127 | return ret; |
01854e69 LY |
1128 | } |
1129 | ||
4be44fcd | 1130 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
1da177e4 | 1131 | { |
4be44fcd | 1132 | int result = 0; |
1180509f | 1133 | struct acpi_processor_throttling *pthrottling; |
1da177e4 | 1134 | |
1da177e4 | 1135 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
1136 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
1137 | pr->throttling.address, | |
1138 | pr->throttling.duty_offset, | |
1139 | pr->throttling.duty_width)); | |
1da177e4 LT |
1140 | |
1141 | if (!pr) | |
d550d98d | 1142 | return -EINVAL; |
1da177e4 | 1143 | |
c30c620e LB |
1144 | /* |
1145 | * Evaluate _PTC, _TSS and _TPC | |
1146 | * They must all be present or none of them can be used. | |
1147 | */ | |
1148 | if (acpi_processor_get_throttling_control(pr) || | |
1149 | acpi_processor_get_throttling_states(pr) || | |
1150 | acpi_processor_get_platform_limit(pr)) | |
1151 | { | |
ff55a9ce LB |
1152 | pr->throttling.acpi_processor_get_throttling = |
1153 | &acpi_processor_get_throttling_fadt; | |
1154 | pr->throttling.acpi_processor_set_throttling = | |
1155 | &acpi_processor_set_throttling_fadt; | |
d1154be3 AS |
1156 | if (acpi_processor_get_fadt_info(pr)) |
1157 | return 0; | |
01854e69 | 1158 | } else { |
ff55a9ce LB |
1159 | pr->throttling.acpi_processor_get_throttling = |
1160 | &acpi_processor_get_throttling_ptc; | |
1161 | pr->throttling.acpi_processor_set_throttling = | |
1162 | &acpi_processor_set_throttling_ptc; | |
01854e69 | 1163 | } |
1da177e4 | 1164 | |
1180509f ZY |
1165 | /* |
1166 | * If TSD package for one CPU can't be parsed successfully, it means | |
1167 | * that this CPU will have no coordination with other CPUs. | |
1168 | */ | |
1169 | if (acpi_processor_get_tsd(pr)) { | |
1170 | pthrottling = &pr->throttling; | |
1171 | pthrottling->tsd_valid_flag = 0; | |
2fdf66b4 | 1172 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
1173 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
1174 | } | |
c30c620e | 1175 | |
1da177e4 LT |
1176 | /* |
1177 | * PIIX4 Errata: We don't support throttling on the original PIIX4. | |
1178 | * This shouldn't be an issue as few (if any) mobile systems ever | |
1179 | * used this part. | |
1180 | */ | |
1181 | if (errata.piix4.throttle) { | |
1182 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 1183 | "Throttling not supported on PIIX4 A- or B-step\n")); |
d550d98d | 1184 | return 0; |
1da177e4 LT |
1185 | } |
1186 | ||
1da177e4 | 1187 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
4be44fcd | 1188 | pr->throttling.state_count)); |
1da177e4 LT |
1189 | |
1190 | pr->flags.throttling = 1; | |
1191 | ||
1192 | /* | |
1193 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. | |
1194 | * thermal) decide to lower performance if it so chooses, but for now | |
1195 | * we'll crank up the speed. | |
1196 | */ | |
1197 | ||
1198 | result = acpi_processor_get_throttling(pr); | |
1199 | if (result) | |
1200 | goto end; | |
1201 | ||
1202 | if (pr->throttling.state) { | |
4be44fcd LB |
1203 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1204 | "Disabling throttling (was T%d)\n", | |
1205 | pr->throttling.state)); | |
2a908002 | 1206 | result = acpi_processor_set_throttling(pr, 0, false); |
1da177e4 LT |
1207 | if (result) |
1208 | goto end; | |
1209 | } | |
1210 | ||
4be44fcd | 1211 | end: |
1da177e4 LT |
1212 | if (result) |
1213 | pr->flags.throttling = 0; | |
1214 | ||
d550d98d | 1215 | return result; |
1da177e4 LT |
1216 | } |
1217 | ||
1da177e4 LT |
1218 | /* proc interface */ |
1219 | ||
4be44fcd LB |
1220 | static int acpi_processor_throttling_seq_show(struct seq_file *seq, |
1221 | void *offset) | |
1da177e4 | 1222 | { |
50dd0969 | 1223 | struct acpi_processor *pr = seq->private; |
4be44fcd LB |
1224 | int i = 0; |
1225 | int result = 0; | |
1da177e4 | 1226 | |
1da177e4 LT |
1227 | if (!pr) |
1228 | goto end; | |
1229 | ||
1230 | if (!(pr->throttling.state_count > 0)) { | |
1231 | seq_puts(seq, "<not supported>\n"); | |
1232 | goto end; | |
1233 | } | |
1234 | ||
1235 | result = acpi_processor_get_throttling(pr); | |
1236 | ||
1237 | if (result) { | |
4be44fcd LB |
1238 | seq_puts(seq, |
1239 | "Could not determine current throttling state.\n"); | |
1da177e4 LT |
1240 | goto end; |
1241 | } | |
1242 | ||
1243 | seq_printf(seq, "state count: %d\n" | |
01854e69 | 1244 | "active state: T%d\n" |
ff55a9ce | 1245 | "state available: T%d to T%d\n", |
01854e69 | 1246 | pr->throttling.state_count, pr->throttling.state, |
ff55a9ce LB |
1247 | pr->throttling_platform_limit, |
1248 | pr->throttling.state_count - 1); | |
1da177e4 LT |
1249 | |
1250 | seq_puts(seq, "states:\n"); | |
3cc2649b LY |
1251 | if (pr->throttling.acpi_processor_get_throttling == |
1252 | acpi_processor_get_throttling_fadt) { | |
01854e69 LY |
1253 | for (i = 0; i < pr->throttling.state_count; i++) |
1254 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
1255 | (i == pr->throttling.state ? '*' : ' '), i, |
1256 | (pr->throttling.states[i].performance ? pr-> | |
1257 | throttling.states[i].performance / 10 : 0)); | |
3cc2649b | 1258 | } else { |
01854e69 LY |
1259 | for (i = 0; i < pr->throttling.state_count; i++) |
1260 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
1261 | (i == pr->throttling.state ? '*' : ' '), i, |
1262 | (int)pr->throttling.states_tss[i]. | |
1263 | freqpercentage); | |
3cc2649b | 1264 | } |
1da177e4 | 1265 | |
4be44fcd | 1266 | end: |
d550d98d | 1267 | return 0; |
1da177e4 LT |
1268 | } |
1269 | ||
4be44fcd LB |
1270 | static int acpi_processor_throttling_open_fs(struct inode *inode, |
1271 | struct file *file) | |
1da177e4 LT |
1272 | { |
1273 | return single_open(file, acpi_processor_throttling_seq_show, | |
4be44fcd | 1274 | PDE(inode)->data); |
1da177e4 LT |
1275 | } |
1276 | ||
ff55a9ce | 1277 | static ssize_t acpi_processor_write_throttling(struct file *file, |
757b1866 AB |
1278 | const char __user * buffer, |
1279 | size_t count, loff_t * data) | |
1da177e4 | 1280 | { |
4be44fcd | 1281 | int result = 0; |
50dd0969 JE |
1282 | struct seq_file *m = file->private_data; |
1283 | struct acpi_processor *pr = m->private; | |
3d532d5e YY |
1284 | char state_string[5] = ""; |
1285 | char *charp = NULL; | |
1286 | size_t state_val = 0; | |
1287 | char tmpbuf[5] = ""; | |
1da177e4 | 1288 | |
1da177e4 | 1289 | if (!pr || (count > sizeof(state_string) - 1)) |
d550d98d | 1290 | return -EINVAL; |
1da177e4 LT |
1291 | |
1292 | if (copy_from_user(state_string, buffer, count)) | |
d550d98d | 1293 | return -EFAULT; |
1da177e4 LT |
1294 | |
1295 | state_string[count] = '\0'; | |
3d532d5e YY |
1296 | if ((count > 0) && (state_string[count-1] == '\n')) |
1297 | state_string[count-1] = '\0'; | |
1da177e4 | 1298 | |
3d532d5e YY |
1299 | charp = state_string; |
1300 | if ((state_string[0] == 't') || (state_string[0] == 'T')) | |
1301 | charp++; | |
1302 | ||
1303 | state_val = simple_strtoul(charp, NULL, 0); | |
1304 | if (state_val >= pr->throttling.state_count) | |
1305 | return -EINVAL; | |
1306 | ||
12b2b34e | 1307 | snprintf(tmpbuf, 5, "%zu", state_val); |
3d532d5e YY |
1308 | |
1309 | if (strcmp(tmpbuf, charp) != 0) | |
1310 | return -EINVAL; | |
1311 | ||
2a908002 | 1312 | result = acpi_processor_set_throttling(pr, state_val, false); |
1da177e4 | 1313 | if (result) |
d550d98d | 1314 | return result; |
1da177e4 | 1315 | |
d550d98d | 1316 | return count; |
1da177e4 LT |
1317 | } |
1318 | ||
070d8eb1 | 1319 | const struct file_operations acpi_processor_throttling_fops = { |
cf7acfab | 1320 | .owner = THIS_MODULE, |
4be44fcd LB |
1321 | .open = acpi_processor_throttling_open_fs, |
1322 | .read = seq_read, | |
d479e908 | 1323 | .write = acpi_processor_write_throttling, |
4be44fcd LB |
1324 | .llseek = seq_lseek, |
1325 | .release = single_release, | |
1da177e4 | 1326 | }; |