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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> | |
32 | #include <linux/cpufreq.h> | |
33 | #include <linux/proc_fs.h> | |
34 | #include <linux/seq_file.h> | |
35 | ||
36 | #include <asm/io.h> | |
37 | #include <asm/uaccess.h> | |
38 | ||
39 | #include <acpi/acpi_bus.h> | |
40 | #include <acpi/processor.h> | |
41 | ||
42 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 | |
43 | #define ACPI_PROCESSOR_CLASS "processor" | |
1da177e4 | 44 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
f52fd66d | 45 | ACPI_MODULE_NAME("processor_throttling"); |
1da177e4 | 46 | |
ff55a9ce LB |
47 | static int acpi_processor_get_throttling(struct acpi_processor *pr); |
48 | int acpi_processor_set_throttling(struct acpi_processor *pr, int state); | |
01854e69 | 49 | |
c30c620e LB |
50 | /* |
51 | * _TPC - Throttling Present Capabilities | |
52 | */ | |
01854e69 LY |
53 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
54 | { | |
55 | acpi_status status = 0; | |
56 | unsigned long tpc = 0; | |
57 | ||
ff55a9ce | 58 | if (!pr) |
01854e69 LY |
59 | return -EINVAL; |
60 | status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); | |
c30c620e LB |
61 | if (ACPI_FAILURE(status)) { |
62 | if (status != AE_NOT_FOUND) { | |
63 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC")); | |
64 | } | |
01854e69 LY |
65 | return -ENODEV; |
66 | } | |
67 | pr->throttling_platform_limit = (int)tpc; | |
68 | return 0; | |
69 | } | |
70 | ||
71 | int acpi_processor_tstate_has_changed(struct acpi_processor *pr) | |
72 | { | |
ef54d5ad ZY |
73 | int result = 0; |
74 | int throttling_limit; | |
75 | int current_state; | |
76 | struct acpi_processor_limit *limit; | |
77 | int target_state; | |
78 | ||
79 | result = acpi_processor_get_platform_limit(pr); | |
80 | if (result) { | |
81 | /* Throttling Limit is unsupported */ | |
82 | return result; | |
83 | } | |
84 | ||
85 | throttling_limit = pr->throttling_platform_limit; | |
86 | if (throttling_limit >= pr->throttling.state_count) { | |
87 | /* Uncorrect Throttling Limit */ | |
88 | return -EINVAL; | |
89 | } | |
90 | ||
91 | current_state = pr->throttling.state; | |
92 | if (current_state > throttling_limit) { | |
93 | /* | |
94 | * The current state can meet the requirement of | |
95 | * _TPC limit. But it is reasonable that OSPM changes | |
96 | * t-states from high to low for better performance. | |
97 | * Of course the limit condition of thermal | |
98 | * and user should be considered. | |
99 | */ | |
100 | limit = &pr->limit; | |
101 | target_state = throttling_limit; | |
102 | if (limit->thermal.tx > target_state) | |
103 | target_state = limit->thermal.tx; | |
104 | if (limit->user.tx > target_state) | |
105 | target_state = limit->user.tx; | |
106 | } else if (current_state == throttling_limit) { | |
107 | /* | |
108 | * Unnecessary to change the throttling state | |
109 | */ | |
110 | return 0; | |
111 | } else { | |
112 | /* | |
113 | * If the current state is lower than the limit of _TPC, it | |
114 | * will be forced to switch to the throttling state defined | |
115 | * by throttling_platfor_limit. | |
116 | * Because the previous state meets with the limit condition | |
117 | * of thermal and user, it is unnecessary to check it again. | |
118 | */ | |
119 | target_state = throttling_limit; | |
120 | } | |
121 | return acpi_processor_set_throttling(pr, target_state); | |
01854e69 LY |
122 | } |
123 | ||
c30c620e LB |
124 | /* |
125 | * _PTC - Processor Throttling Control (and status) register location | |
126 | */ | |
01854e69 LY |
127 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) |
128 | { | |
129 | int result = 0; | |
130 | acpi_status status = 0; | |
131 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
132 | union acpi_object *ptc = NULL; | |
133 | union acpi_object obj = { 0 }; | |
9bcb2721 | 134 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
135 | |
136 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); | |
137 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
138 | if (status != AE_NOT_FOUND) { |
139 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); | |
140 | } | |
01854e69 LY |
141 | return -ENODEV; |
142 | } | |
143 | ||
144 | ptc = (union acpi_object *)buffer.pointer; | |
145 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) | |
146 | || (ptc->package.count != 2)) { | |
147 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); | |
148 | result = -EFAULT; | |
149 | goto end; | |
150 | } | |
151 | ||
152 | /* | |
153 | * control_register | |
154 | */ | |
155 | ||
156 | obj = ptc->package.elements[0]; | |
157 | ||
158 | if ((obj.type != ACPI_TYPE_BUFFER) | |
159 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
160 | || (obj.buffer.pointer == NULL)) { | |
ff55a9ce LB |
161 | printk(KERN_ERR PREFIX |
162 | "Invalid _PTC data (control_register)\n"); | |
01854e69 LY |
163 | result = -EFAULT; |
164 | goto end; | |
165 | } | |
166 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, | |
167 | sizeof(struct acpi_ptc_register)); | |
168 | ||
169 | /* | |
170 | * status_register | |
171 | */ | |
172 | ||
173 | obj = ptc->package.elements[1]; | |
174 | ||
175 | if ((obj.type != ACPI_TYPE_BUFFER) | |
176 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
177 | || (obj.buffer.pointer == NULL)) { | |
178 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); | |
179 | result = -EFAULT; | |
180 | goto end; | |
181 | } | |
182 | ||
183 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, | |
ff55a9ce | 184 | sizeof(struct acpi_ptc_register)); |
01854e69 | 185 | |
9bcb2721 ZY |
186 | throttling = &pr->throttling; |
187 | ||
188 | if ((throttling->control_register.bit_width + | |
189 | throttling->control_register.bit_offset) > 32) { | |
190 | printk(KERN_ERR PREFIX "Invalid _PTC control register\n"); | |
191 | result = -EFAULT; | |
192 | goto end; | |
193 | } | |
194 | ||
195 | if ((throttling->status_register.bit_width + | |
196 | throttling->status_register.bit_offset) > 32) { | |
197 | printk(KERN_ERR PREFIX "Invalid _PTC status register\n"); | |
198 | result = -EFAULT; | |
199 | goto end; | |
200 | } | |
201 | ||
ff55a9ce | 202 | end: |
01854e69 LY |
203 | kfree(buffer.pointer); |
204 | ||
205 | return result; | |
206 | } | |
c30c620e LB |
207 | |
208 | /* | |
209 | * _TSS - Throttling Supported States | |
210 | */ | |
01854e69 LY |
211 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) |
212 | { | |
213 | int result = 0; | |
214 | acpi_status status = AE_OK; | |
215 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
216 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
217 | struct acpi_buffer state = { 0, NULL }; | |
218 | union acpi_object *tss = NULL; | |
219 | int i; | |
220 | ||
221 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); | |
222 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
223 | if (status != AE_NOT_FOUND) { |
224 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); | |
225 | } | |
01854e69 LY |
226 | return -ENODEV; |
227 | } | |
228 | ||
229 | tss = buffer.pointer; | |
230 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { | |
231 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); | |
232 | result = -EFAULT; | |
233 | goto end; | |
234 | } | |
235 | ||
236 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
237 | tss->package.count)); | |
238 | ||
239 | pr->throttling.state_count = tss->package.count; | |
240 | pr->throttling.states_tss = | |
241 | kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count, | |
242 | GFP_KERNEL); | |
243 | if (!pr->throttling.states_tss) { | |
244 | result = -ENOMEM; | |
245 | goto end; | |
246 | } | |
247 | ||
248 | for (i = 0; i < pr->throttling.state_count; i++) { | |
249 | ||
ff55a9ce LB |
250 | struct acpi_processor_tx_tss *tx = |
251 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
252 | states_tss[i]); | |
01854e69 LY |
253 | |
254 | state.length = sizeof(struct acpi_processor_tx_tss); | |
255 | state.pointer = tx; | |
256 | ||
257 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
258 | ||
259 | status = acpi_extract_package(&(tss->package.elements[i]), | |
260 | &format, &state); | |
261 | if (ACPI_FAILURE(status)) { | |
262 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); | |
263 | result = -EFAULT; | |
264 | kfree(pr->throttling.states_tss); | |
265 | goto end; | |
266 | } | |
267 | ||
268 | if (!tx->freqpercentage) { | |
269 | printk(KERN_ERR PREFIX | |
ff55a9ce | 270 | "Invalid _TSS data: freq is zero\n"); |
01854e69 LY |
271 | result = -EFAULT; |
272 | kfree(pr->throttling.states_tss); | |
273 | goto end; | |
274 | } | |
275 | } | |
276 | ||
277 | end: | |
278 | kfree(buffer.pointer); | |
279 | ||
280 | return result; | |
281 | } | |
c30c620e LB |
282 | |
283 | /* | |
284 | * _TSD - T-State Dependencies | |
285 | */ | |
ff55a9ce | 286 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
01854e69 LY |
287 | { |
288 | int result = 0; | |
289 | acpi_status status = AE_OK; | |
ff55a9ce LB |
290 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
291 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
292 | struct acpi_buffer state = { 0, NULL }; | |
293 | union acpi_object *tsd = NULL; | |
01854e69 LY |
294 | struct acpi_tsd_package *pdomain; |
295 | ||
296 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); | |
297 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
298 | if (status != AE_NOT_FOUND) { |
299 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD")); | |
300 | } | |
01854e69 LY |
301 | return -ENODEV; |
302 | } | |
303 | ||
304 | tsd = buffer.pointer; | |
305 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { | |
306 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
307 | result = -EFAULT; | |
308 | goto end; | |
309 | } | |
310 | ||
311 | if (tsd->package.count != 1) { | |
312 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
313 | result = -EFAULT; | |
314 | goto end; | |
315 | } | |
316 | ||
317 | pdomain = &(pr->throttling.domain_info); | |
318 | ||
319 | state.length = sizeof(struct acpi_tsd_package); | |
320 | state.pointer = pdomain; | |
321 | ||
322 | status = acpi_extract_package(&(tsd->package.elements[0]), | |
ff55a9ce | 323 | &format, &state); |
01854e69 LY |
324 | if (ACPI_FAILURE(status)) { |
325 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
326 | result = -EFAULT; | |
327 | goto end; | |
328 | } | |
329 | ||
330 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { | |
331 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:num_entries\n")); | |
332 | result = -EFAULT; | |
333 | goto end; | |
334 | } | |
335 | ||
336 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { | |
337 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:revision\n")); | |
338 | result = -EFAULT; | |
339 | goto end; | |
340 | } | |
341 | ||
ff55a9ce | 342 | end: |
01854e69 LY |
343 | kfree(buffer.pointer); |
344 | return result; | |
345 | } | |
346 | ||
1da177e4 LT |
347 | /* -------------------------------------------------------------------------- |
348 | Throttling Control | |
349 | -------------------------------------------------------------------------- */ | |
01854e69 | 350 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
1da177e4 | 351 | { |
4be44fcd LB |
352 | int state = 0; |
353 | u32 value = 0; | |
354 | u32 duty_mask = 0; | |
355 | u32 duty_value = 0; | |
1da177e4 | 356 | |
1da177e4 | 357 | if (!pr) |
d550d98d | 358 | return -EINVAL; |
1da177e4 LT |
359 | |
360 | if (!pr->flags.throttling) | |
d550d98d | 361 | return -ENODEV; |
1da177e4 LT |
362 | |
363 | pr->throttling.state = 0; | |
364 | ||
365 | duty_mask = pr->throttling.state_count - 1; | |
366 | ||
367 | duty_mask <<= pr->throttling.duty_offset; | |
368 | ||
369 | local_irq_disable(); | |
370 | ||
371 | value = inl(pr->throttling.address); | |
372 | ||
373 | /* | |
374 | * Compute the current throttling state when throttling is enabled | |
375 | * (bit 4 is on). | |
376 | */ | |
377 | if (value & 0x10) { | |
378 | duty_value = value & duty_mask; | |
379 | duty_value >>= pr->throttling.duty_offset; | |
380 | ||
381 | if (duty_value) | |
4be44fcd | 382 | state = pr->throttling.state_count - duty_value; |
1da177e4 LT |
383 | } |
384 | ||
385 | pr->throttling.state = state; | |
386 | ||
387 | local_irq_enable(); | |
388 | ||
389 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
390 | "Throttling state is T%d (%d%% throttling applied)\n", |
391 | state, pr->throttling.states[state].performance)); | |
1da177e4 | 392 | |
d550d98d | 393 | return 0; |
1da177e4 LT |
394 | } |
395 | ||
0753f6e0 ZY |
396 | static int acpi_read_throttling_status(struct acpi_processor *pr, |
397 | acpi_integer *value) | |
01854e69 | 398 | { |
9bcb2721 | 399 | u32 bit_width, bit_offset; |
0753f6e0 | 400 | u64 ptc_value; |
9bcb2721 | 401 | u64 ptc_mask; |
0753f6e0 ZY |
402 | struct acpi_processor_throttling *throttling; |
403 | int ret = -1; | |
404 | ||
405 | throttling = &pr->throttling; | |
01854e69 LY |
406 | switch (throttling->status_register.space_id) { |
407 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
0753f6e0 | 408 | ptc_value = 0; |
9bcb2721 ZY |
409 | bit_width = throttling->status_register.bit_width; |
410 | bit_offset = throttling->status_register.bit_offset; | |
411 | ||
ff55a9ce | 412 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
0753f6e0 | 413 | address, (u32 *) &ptc_value, |
9bcb2721 ZY |
414 | (u32) (bit_width + bit_offset)); |
415 | ptc_mask = (1 << bit_width) - 1; | |
416 | *value = (acpi_integer) ((ptc_value >> bit_offset) & ptc_mask); | |
0753f6e0 | 417 | ret = 0; |
01854e69 LY |
418 | break; |
419 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
ff55a9ce LB |
420 | printk(KERN_ERR PREFIX |
421 | "HARDWARE addr space,NOT supported yet\n"); | |
01854e69 LY |
422 | break; |
423 | default: | |
424 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 425 | (u32) (throttling->status_register.space_id)); |
01854e69 | 426 | } |
0753f6e0 | 427 | return ret; |
01854e69 LY |
428 | } |
429 | ||
0753f6e0 ZY |
430 | static int acpi_write_throttling_state(struct acpi_processor *pr, |
431 | acpi_integer value) | |
01854e69 | 432 | { |
9bcb2721 | 433 | u32 bit_width, bit_offset; |
0753f6e0 | 434 | u64 ptc_value; |
9bcb2721 | 435 | u64 ptc_mask; |
0753f6e0 | 436 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
437 | int ret = -1; |
438 | ||
0753f6e0 | 439 | throttling = &pr->throttling; |
01854e69 LY |
440 | switch (throttling->control_register.space_id) { |
441 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
442 | bit_width = throttling->control_register.bit_width; |
443 | bit_offset = throttling->control_register.bit_offset; | |
444 | ptc_mask = (1 << bit_width) - 1; | |
445 | ptc_value = value & ptc_mask; | |
446 | ||
ff55a9ce | 447 | acpi_os_write_port((acpi_io_address) throttling-> |
9bcb2721 ZY |
448 | control_register.address, |
449 | (u32) (ptc_value << bit_offset), | |
450 | (u32) (bit_width + bit_offset)); | |
01854e69 LY |
451 | ret = 0; |
452 | break; | |
453 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
ff55a9ce LB |
454 | printk(KERN_ERR PREFIX |
455 | "HARDWARE addr space,NOT supported yet\n"); | |
01854e69 LY |
456 | break; |
457 | default: | |
458 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 459 | (u32) (throttling->control_register.space_id)); |
01854e69 LY |
460 | } |
461 | return ret; | |
462 | } | |
463 | ||
0753f6e0 ZY |
464 | static int acpi_get_throttling_state(struct acpi_processor *pr, |
465 | acpi_integer value) | |
01854e69 LY |
466 | { |
467 | int i; | |
468 | ||
469 | for (i = 0; i < pr->throttling.state_count; i++) { | |
ff55a9ce LB |
470 | struct acpi_processor_tx_tss *tx = |
471 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
472 | states_tss[i]); | |
473 | if (tx->control == value) | |
01854e69 LY |
474 | break; |
475 | } | |
ff55a9ce LB |
476 | if (i > pr->throttling.state_count) |
477 | i = -1; | |
01854e69 LY |
478 | return i; |
479 | } | |
480 | ||
0753f6e0 ZY |
481 | static int acpi_get_throttling_value(struct acpi_processor *pr, |
482 | int state, acpi_integer *value) | |
01854e69 | 483 | { |
0753f6e0 ZY |
484 | int ret = -1; |
485 | ||
ff55a9ce LB |
486 | if (state >= 0 && state <= pr->throttling.state_count) { |
487 | struct acpi_processor_tx_tss *tx = | |
488 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
489 | states_tss[state]); | |
0753f6e0 ZY |
490 | *value = tx->control; |
491 | ret = 0; | |
01854e69 | 492 | } |
0753f6e0 | 493 | return ret; |
01854e69 LY |
494 | } |
495 | ||
496 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) | |
497 | { | |
498 | int state = 0; | |
0753f6e0 ZY |
499 | int ret; |
500 | acpi_integer value; | |
01854e69 | 501 | |
01854e69 LY |
502 | if (!pr) |
503 | return -EINVAL; | |
504 | ||
505 | if (!pr->flags.throttling) | |
506 | return -ENODEV; | |
507 | ||
508 | pr->throttling.state = 0; | |
509 | local_irq_disable(); | |
0753f6e0 ZY |
510 | value = 0; |
511 | ret = acpi_read_throttling_status(pr, &value); | |
512 | if (ret >= 0) { | |
ff55a9ce | 513 | state = acpi_get_throttling_state(pr, value); |
01854e69 LY |
514 | pr->throttling.state = state; |
515 | } | |
516 | local_irq_enable(); | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
01854e69 LY |
521 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
522 | { | |
523 | return pr->throttling.acpi_processor_get_throttling(pr); | |
524 | } | |
525 | ||
22cc5019 ZY |
526 | static int acpi_processor_get_fadt_info(struct acpi_processor *pr) |
527 | { | |
528 | int i, step; | |
529 | ||
530 | if (!pr->throttling.address) { | |
531 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); | |
532 | return -EINVAL; | |
533 | } else if (!pr->throttling.duty_width) { | |
534 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); | |
535 | return -EINVAL; | |
536 | } | |
537 | /* TBD: Support duty_cycle values that span bit 4. */ | |
538 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { | |
539 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); | |
540 | return -EINVAL; | |
541 | } | |
542 | ||
543 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; | |
544 | ||
545 | /* | |
546 | * Compute state values. Note that throttling displays a linear power | |
547 | * performance relationship (at 50% performance the CPU will consume | |
548 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. | |
549 | */ | |
550 | ||
551 | step = (1000 / pr->throttling.state_count); | |
552 | ||
553 | for (i = 0; i < pr->throttling.state_count; i++) { | |
554 | pr->throttling.states[i].performance = 1000 - step * i; | |
555 | pr->throttling.states[i].power = 1000 - step * i; | |
556 | } | |
557 | return 0; | |
558 | } | |
559 | ||
6c5cf8aa AB |
560 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
561 | int state) | |
1da177e4 | 562 | { |
4be44fcd LB |
563 | u32 value = 0; |
564 | u32 duty_mask = 0; | |
565 | u32 duty_value = 0; | |
1da177e4 | 566 | |
1da177e4 | 567 | if (!pr) |
d550d98d | 568 | return -EINVAL; |
1da177e4 LT |
569 | |
570 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
d550d98d | 571 | return -EINVAL; |
1da177e4 LT |
572 | |
573 | if (!pr->flags.throttling) | |
d550d98d | 574 | return -ENODEV; |
1da177e4 LT |
575 | |
576 | if (state == pr->throttling.state) | |
d550d98d | 577 | return 0; |
1da177e4 | 578 | |
01854e69 LY |
579 | if (state < pr->throttling_platform_limit) |
580 | return -EPERM; | |
1da177e4 LT |
581 | /* |
582 | * Calculate the duty_value and duty_mask. | |
583 | */ | |
584 | if (state) { | |
585 | duty_value = pr->throttling.state_count - state; | |
586 | ||
587 | duty_value <<= pr->throttling.duty_offset; | |
588 | ||
589 | /* Used to clear all duty_value bits */ | |
590 | duty_mask = pr->throttling.state_count - 1; | |
591 | ||
cee324b1 | 592 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
1da177e4 LT |
593 | duty_mask = ~duty_mask; |
594 | } | |
595 | ||
596 | local_irq_disable(); | |
597 | ||
598 | /* | |
599 | * Disable throttling by writing a 0 to bit 4. Note that we must | |
600 | * turn it off before you can change the duty_value. | |
601 | */ | |
602 | value = inl(pr->throttling.address); | |
603 | if (value & 0x10) { | |
604 | value &= 0xFFFFFFEF; | |
605 | outl(value, pr->throttling.address); | |
606 | } | |
607 | ||
608 | /* | |
609 | * Write the new duty_value and then enable throttling. Note | |
610 | * that a state value of 0 leaves throttling disabled. | |
611 | */ | |
612 | if (state) { | |
613 | value &= duty_mask; | |
614 | value |= duty_value; | |
615 | outl(value, pr->throttling.address); | |
616 | ||
617 | value |= 0x00000010; | |
618 | outl(value, pr->throttling.address); | |
619 | } | |
620 | ||
621 | pr->throttling.state = state; | |
622 | ||
623 | local_irq_enable(); | |
624 | ||
625 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
626 | "Throttling state set to T%d (%d%%)\n", state, |
627 | (pr->throttling.states[state].performance ? pr-> | |
628 | throttling.states[state].performance / 10 : 0))); | |
1da177e4 | 629 | |
d550d98d | 630 | return 0; |
1da177e4 LT |
631 | } |
632 | ||
6c5cf8aa AB |
633 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
634 | int state) | |
01854e69 | 635 | { |
0753f6e0 ZY |
636 | int ret; |
637 | acpi_integer value; | |
01854e69 LY |
638 | |
639 | if (!pr) | |
640 | return -EINVAL; | |
641 | ||
642 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
643 | return -EINVAL; | |
644 | ||
645 | if (!pr->flags.throttling) | |
646 | return -ENODEV; | |
647 | ||
648 | if (state == pr->throttling.state) | |
649 | return 0; | |
650 | ||
651 | if (state < pr->throttling_platform_limit) | |
652 | return -EPERM; | |
653 | ||
654 | local_irq_disable(); | |
0753f6e0 ZY |
655 | value = 0; |
656 | ret = acpi_get_throttling_value(pr, state, &value); | |
657 | if (ret >= 0) { | |
658 | acpi_write_throttling_state(pr, value); | |
01854e69 LY |
659 | pr->throttling.state = state; |
660 | } | |
661 | local_irq_enable(); | |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
666 | int acpi_processor_set_throttling(struct acpi_processor *pr, int state) | |
667 | { | |
ff55a9ce | 668 | return pr->throttling.acpi_processor_set_throttling(pr, state); |
01854e69 LY |
669 | } |
670 | ||
4be44fcd | 671 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
1da177e4 | 672 | { |
4be44fcd | 673 | int result = 0; |
1da177e4 | 674 | |
1da177e4 | 675 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
676 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
677 | pr->throttling.address, | |
678 | pr->throttling.duty_offset, | |
679 | pr->throttling.duty_width)); | |
1da177e4 LT |
680 | |
681 | if (!pr) | |
d550d98d | 682 | return -EINVAL; |
1da177e4 | 683 | |
c30c620e LB |
684 | /* |
685 | * Evaluate _PTC, _TSS and _TPC | |
686 | * They must all be present or none of them can be used. | |
687 | */ | |
688 | if (acpi_processor_get_throttling_control(pr) || | |
689 | acpi_processor_get_throttling_states(pr) || | |
690 | acpi_processor_get_platform_limit(pr)) | |
691 | { | |
22cc5019 ZY |
692 | if (acpi_processor_get_fadt_info(pr)) |
693 | return 0; | |
ff55a9ce LB |
694 | pr->throttling.acpi_processor_get_throttling = |
695 | &acpi_processor_get_throttling_fadt; | |
696 | pr->throttling.acpi_processor_set_throttling = | |
697 | &acpi_processor_set_throttling_fadt; | |
01854e69 | 698 | } else { |
ff55a9ce LB |
699 | pr->throttling.acpi_processor_get_throttling = |
700 | &acpi_processor_get_throttling_ptc; | |
701 | pr->throttling.acpi_processor_set_throttling = | |
702 | &acpi_processor_set_throttling_ptc; | |
01854e69 | 703 | } |
1da177e4 | 704 | |
c30c620e LB |
705 | acpi_processor_get_tsd(pr); |
706 | ||
1da177e4 LT |
707 | /* |
708 | * PIIX4 Errata: We don't support throttling on the original PIIX4. | |
709 | * This shouldn't be an issue as few (if any) mobile systems ever | |
710 | * used this part. | |
711 | */ | |
712 | if (errata.piix4.throttle) { | |
713 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 714 | "Throttling not supported on PIIX4 A- or B-step\n")); |
d550d98d | 715 | return 0; |
1da177e4 LT |
716 | } |
717 | ||
1da177e4 | 718 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
4be44fcd | 719 | pr->throttling.state_count)); |
1da177e4 LT |
720 | |
721 | pr->flags.throttling = 1; | |
722 | ||
723 | /* | |
724 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. | |
725 | * thermal) decide to lower performance if it so chooses, but for now | |
726 | * we'll crank up the speed. | |
727 | */ | |
728 | ||
729 | result = acpi_processor_get_throttling(pr); | |
730 | if (result) | |
731 | goto end; | |
732 | ||
733 | if (pr->throttling.state) { | |
4be44fcd LB |
734 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
735 | "Disabling throttling (was T%d)\n", | |
736 | pr->throttling.state)); | |
1da177e4 LT |
737 | result = acpi_processor_set_throttling(pr, 0); |
738 | if (result) | |
739 | goto end; | |
740 | } | |
741 | ||
4be44fcd | 742 | end: |
1da177e4 LT |
743 | if (result) |
744 | pr->flags.throttling = 0; | |
745 | ||
d550d98d | 746 | return result; |
1da177e4 LT |
747 | } |
748 | ||
1da177e4 LT |
749 | /* proc interface */ |
750 | ||
4be44fcd LB |
751 | static int acpi_processor_throttling_seq_show(struct seq_file *seq, |
752 | void *offset) | |
1da177e4 | 753 | { |
50dd0969 | 754 | struct acpi_processor *pr = seq->private; |
4be44fcd LB |
755 | int i = 0; |
756 | int result = 0; | |
1da177e4 | 757 | |
1da177e4 LT |
758 | if (!pr) |
759 | goto end; | |
760 | ||
761 | if (!(pr->throttling.state_count > 0)) { | |
762 | seq_puts(seq, "<not supported>\n"); | |
763 | goto end; | |
764 | } | |
765 | ||
766 | result = acpi_processor_get_throttling(pr); | |
767 | ||
768 | if (result) { | |
4be44fcd LB |
769 | seq_puts(seq, |
770 | "Could not determine current throttling state.\n"); | |
1da177e4 LT |
771 | goto end; |
772 | } | |
773 | ||
774 | seq_printf(seq, "state count: %d\n" | |
01854e69 | 775 | "active state: T%d\n" |
ff55a9ce | 776 | "state available: T%d to T%d\n", |
01854e69 | 777 | pr->throttling.state_count, pr->throttling.state, |
ff55a9ce LB |
778 | pr->throttling_platform_limit, |
779 | pr->throttling.state_count - 1); | |
1da177e4 LT |
780 | |
781 | seq_puts(seq, "states:\n"); | |
3cc2649b LY |
782 | if (pr->throttling.acpi_processor_get_throttling == |
783 | acpi_processor_get_throttling_fadt) { | |
01854e69 LY |
784 | for (i = 0; i < pr->throttling.state_count; i++) |
785 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
786 | (i == pr->throttling.state ? '*' : ' '), i, |
787 | (pr->throttling.states[i].performance ? pr-> | |
788 | throttling.states[i].performance / 10 : 0)); | |
3cc2649b | 789 | } else { |
01854e69 LY |
790 | for (i = 0; i < pr->throttling.state_count; i++) |
791 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
792 | (i == pr->throttling.state ? '*' : ' '), i, |
793 | (int)pr->throttling.states_tss[i]. | |
794 | freqpercentage); | |
3cc2649b | 795 | } |
1da177e4 | 796 | |
4be44fcd | 797 | end: |
d550d98d | 798 | return 0; |
1da177e4 LT |
799 | } |
800 | ||
4be44fcd LB |
801 | static int acpi_processor_throttling_open_fs(struct inode *inode, |
802 | struct file *file) | |
1da177e4 LT |
803 | { |
804 | return single_open(file, acpi_processor_throttling_seq_show, | |
4be44fcd | 805 | PDE(inode)->data); |
1da177e4 LT |
806 | } |
807 | ||
ff55a9ce | 808 | static ssize_t acpi_processor_write_throttling(struct file *file, |
757b1866 AB |
809 | const char __user * buffer, |
810 | size_t count, loff_t * data) | |
1da177e4 | 811 | { |
4be44fcd | 812 | int result = 0; |
50dd0969 JE |
813 | struct seq_file *m = file->private_data; |
814 | struct acpi_processor *pr = m->private; | |
4be44fcd | 815 | char state_string[12] = { '\0' }; |
1da177e4 | 816 | |
1da177e4 | 817 | if (!pr || (count > sizeof(state_string) - 1)) |
d550d98d | 818 | return -EINVAL; |
1da177e4 LT |
819 | |
820 | if (copy_from_user(state_string, buffer, count)) | |
d550d98d | 821 | return -EFAULT; |
1da177e4 LT |
822 | |
823 | state_string[count] = '\0'; | |
824 | ||
825 | result = acpi_processor_set_throttling(pr, | |
4be44fcd LB |
826 | simple_strtoul(state_string, |
827 | NULL, 0)); | |
1da177e4 | 828 | if (result) |
d550d98d | 829 | return result; |
1da177e4 | 830 | |
d550d98d | 831 | return count; |
1da177e4 LT |
832 | } |
833 | ||
834 | struct file_operations acpi_processor_throttling_fops = { | |
4be44fcd LB |
835 | .open = acpi_processor_throttling_open_fs, |
836 | .read = seq_read, | |
d479e908 | 837 | .write = acpi_processor_write_throttling, |
4be44fcd LB |
838 | .llseek = seq_lseek, |
839 | .release = single_release, | |
1da177e4 | 840 | }; |