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