Commit | Line | Data |
---|---|---|
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> | |
41 | #include <acpi/processor.h> | |
42 | ||
43 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 | |
44 | #define ACPI_PROCESSOR_CLASS "processor" | |
1da177e4 | 45 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
f52fd66d | 46 | ACPI_MODULE_NAME("processor_throttling"); |
1da177e4 | 47 | |
ff55a9ce LB |
48 | static int acpi_processor_get_throttling(struct acpi_processor *pr); |
49 | int acpi_processor_set_throttling(struct acpi_processor *pr, int state); | |
01854e69 | 50 | |
c30c620e LB |
51 | /* |
52 | * _TPC - Throttling Present Capabilities | |
53 | */ | |
01854e69 LY |
54 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
55 | { | |
56 | acpi_status status = 0; | |
57 | unsigned long tpc = 0; | |
58 | ||
ff55a9ce | 59 | if (!pr) |
01854e69 LY |
60 | return -EINVAL; |
61 | status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); | |
c30c620e LB |
62 | if (ACPI_FAILURE(status)) { |
63 | if (status != AE_NOT_FOUND) { | |
64 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC")); | |
65 | } | |
01854e69 LY |
66 | return -ENODEV; |
67 | } | |
68 | pr->throttling_platform_limit = (int)tpc; | |
69 | return 0; | |
70 | } | |
71 | ||
72 | int acpi_processor_tstate_has_changed(struct acpi_processor *pr) | |
73 | { | |
ef54d5ad ZY |
74 | int result = 0; |
75 | int throttling_limit; | |
76 | int current_state; | |
77 | struct acpi_processor_limit *limit; | |
78 | int target_state; | |
79 | ||
80 | result = acpi_processor_get_platform_limit(pr); | |
81 | if (result) { | |
82 | /* Throttling Limit is unsupported */ | |
83 | return result; | |
84 | } | |
85 | ||
86 | throttling_limit = pr->throttling_platform_limit; | |
87 | if (throttling_limit >= pr->throttling.state_count) { | |
88 | /* Uncorrect Throttling Limit */ | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
92 | current_state = pr->throttling.state; | |
93 | if (current_state > throttling_limit) { | |
94 | /* | |
95 | * The current state can meet the requirement of | |
96 | * _TPC limit. But it is reasonable that OSPM changes | |
97 | * t-states from high to low for better performance. | |
98 | * Of course the limit condition of thermal | |
99 | * and user should be considered. | |
100 | */ | |
101 | limit = &pr->limit; | |
102 | target_state = throttling_limit; | |
103 | if (limit->thermal.tx > target_state) | |
104 | target_state = limit->thermal.tx; | |
105 | if (limit->user.tx > target_state) | |
106 | target_state = limit->user.tx; | |
107 | } else if (current_state == throttling_limit) { | |
108 | /* | |
109 | * Unnecessary to change the throttling state | |
110 | */ | |
111 | return 0; | |
112 | } else { | |
113 | /* | |
114 | * If the current state is lower than the limit of _TPC, it | |
115 | * will be forced to switch to the throttling state defined | |
116 | * by throttling_platfor_limit. | |
117 | * Because the previous state meets with the limit condition | |
118 | * of thermal and user, it is unnecessary to check it again. | |
119 | */ | |
120 | target_state = throttling_limit; | |
121 | } | |
122 | return acpi_processor_set_throttling(pr, target_state); | |
01854e69 LY |
123 | } |
124 | ||
c30c620e LB |
125 | /* |
126 | * _PTC - Processor Throttling Control (and status) register location | |
127 | */ | |
01854e69 LY |
128 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) |
129 | { | |
130 | int result = 0; | |
131 | acpi_status status = 0; | |
132 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
133 | union acpi_object *ptc = NULL; | |
134 | union acpi_object obj = { 0 }; | |
9bcb2721 | 135 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
136 | |
137 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); | |
138 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
139 | if (status != AE_NOT_FOUND) { |
140 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); | |
141 | } | |
01854e69 LY |
142 | return -ENODEV; |
143 | } | |
144 | ||
145 | ptc = (union acpi_object *)buffer.pointer; | |
146 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) | |
147 | || (ptc->package.count != 2)) { | |
148 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); | |
149 | result = -EFAULT; | |
150 | goto end; | |
151 | } | |
152 | ||
153 | /* | |
154 | * control_register | |
155 | */ | |
156 | ||
157 | obj = ptc->package.elements[0]; | |
158 | ||
159 | if ((obj.type != ACPI_TYPE_BUFFER) | |
160 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
161 | || (obj.buffer.pointer == NULL)) { | |
ff55a9ce LB |
162 | printk(KERN_ERR PREFIX |
163 | "Invalid _PTC data (control_register)\n"); | |
01854e69 LY |
164 | result = -EFAULT; |
165 | goto end; | |
166 | } | |
167 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, | |
168 | sizeof(struct acpi_ptc_register)); | |
169 | ||
170 | /* | |
171 | * status_register | |
172 | */ | |
173 | ||
174 | obj = ptc->package.elements[1]; | |
175 | ||
176 | if ((obj.type != ACPI_TYPE_BUFFER) | |
177 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
178 | || (obj.buffer.pointer == NULL)) { | |
179 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); | |
180 | result = -EFAULT; | |
181 | goto end; | |
182 | } | |
183 | ||
184 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, | |
ff55a9ce | 185 | sizeof(struct acpi_ptc_register)); |
01854e69 | 186 | |
9bcb2721 ZY |
187 | throttling = &pr->throttling; |
188 | ||
189 | if ((throttling->control_register.bit_width + | |
190 | throttling->control_register.bit_offset) > 32) { | |
191 | printk(KERN_ERR PREFIX "Invalid _PTC control register\n"); | |
192 | result = -EFAULT; | |
193 | goto end; | |
194 | } | |
195 | ||
196 | if ((throttling->status_register.bit_width + | |
197 | throttling->status_register.bit_offset) > 32) { | |
198 | printk(KERN_ERR PREFIX "Invalid _PTC status register\n"); | |
199 | result = -EFAULT; | |
200 | goto end; | |
201 | } | |
202 | ||
ff55a9ce | 203 | end: |
01854e69 LY |
204 | kfree(buffer.pointer); |
205 | ||
206 | return result; | |
207 | } | |
c30c620e LB |
208 | |
209 | /* | |
210 | * _TSS - Throttling Supported States | |
211 | */ | |
01854e69 LY |
212 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) |
213 | { | |
214 | int result = 0; | |
215 | acpi_status status = AE_OK; | |
216 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
217 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
218 | struct acpi_buffer state = { 0, NULL }; | |
219 | union acpi_object *tss = NULL; | |
220 | int i; | |
221 | ||
222 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); | |
223 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
224 | if (status != AE_NOT_FOUND) { |
225 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); | |
226 | } | |
01854e69 LY |
227 | return -ENODEV; |
228 | } | |
229 | ||
230 | tss = buffer.pointer; | |
231 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { | |
232 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); | |
233 | result = -EFAULT; | |
234 | goto end; | |
235 | } | |
236 | ||
237 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
238 | tss->package.count)); | |
239 | ||
240 | pr->throttling.state_count = tss->package.count; | |
241 | pr->throttling.states_tss = | |
242 | kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count, | |
243 | GFP_KERNEL); | |
244 | if (!pr->throttling.states_tss) { | |
245 | result = -ENOMEM; | |
246 | goto end; | |
247 | } | |
248 | ||
249 | for (i = 0; i < pr->throttling.state_count; i++) { | |
250 | ||
ff55a9ce LB |
251 | struct acpi_processor_tx_tss *tx = |
252 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
253 | states_tss[i]); | |
01854e69 LY |
254 | |
255 | state.length = sizeof(struct acpi_processor_tx_tss); | |
256 | state.pointer = tx; | |
257 | ||
258 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
259 | ||
260 | status = acpi_extract_package(&(tss->package.elements[i]), | |
261 | &format, &state); | |
262 | if (ACPI_FAILURE(status)) { | |
263 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); | |
264 | result = -EFAULT; | |
265 | kfree(pr->throttling.states_tss); | |
266 | goto end; | |
267 | } | |
268 | ||
269 | if (!tx->freqpercentage) { | |
270 | printk(KERN_ERR PREFIX | |
ff55a9ce | 271 | "Invalid _TSS data: freq is zero\n"); |
01854e69 LY |
272 | result = -EFAULT; |
273 | kfree(pr->throttling.states_tss); | |
274 | goto end; | |
275 | } | |
276 | } | |
277 | ||
278 | end: | |
279 | kfree(buffer.pointer); | |
280 | ||
281 | return result; | |
282 | } | |
c30c620e LB |
283 | |
284 | /* | |
285 | * _TSD - T-State Dependencies | |
286 | */ | |
ff55a9ce | 287 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
01854e69 LY |
288 | { |
289 | int result = 0; | |
290 | acpi_status status = AE_OK; | |
ff55a9ce LB |
291 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
292 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
293 | struct acpi_buffer state = { 0, NULL }; | |
294 | union acpi_object *tsd = NULL; | |
01854e69 LY |
295 | struct acpi_tsd_package *pdomain; |
296 | ||
297 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); | |
298 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
299 | if (status != AE_NOT_FOUND) { |
300 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD")); | |
301 | } | |
01854e69 LY |
302 | return -ENODEV; |
303 | } | |
304 | ||
305 | tsd = buffer.pointer; | |
306 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { | |
307 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
308 | result = -EFAULT; | |
309 | goto end; | |
310 | } | |
311 | ||
312 | if (tsd->package.count != 1) { | |
313 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
314 | result = -EFAULT; | |
315 | goto end; | |
316 | } | |
317 | ||
318 | pdomain = &(pr->throttling.domain_info); | |
319 | ||
320 | state.length = sizeof(struct acpi_tsd_package); | |
321 | state.pointer = pdomain; | |
322 | ||
323 | status = acpi_extract_package(&(tsd->package.elements[0]), | |
ff55a9ce | 324 | &format, &state); |
01854e69 LY |
325 | if (ACPI_FAILURE(status)) { |
326 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
327 | result = -EFAULT; | |
328 | goto end; | |
329 | } | |
330 | ||
331 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { | |
332 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:num_entries\n")); | |
333 | result = -EFAULT; | |
334 | goto end; | |
335 | } | |
336 | ||
337 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { | |
338 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:revision\n")); | |
339 | result = -EFAULT; | |
340 | goto end; | |
341 | } | |
342 | ||
ff55a9ce | 343 | end: |
01854e69 LY |
344 | kfree(buffer.pointer); |
345 | return result; | |
346 | } | |
347 | ||
1da177e4 LT |
348 | /* -------------------------------------------------------------------------- |
349 | Throttling Control | |
350 | -------------------------------------------------------------------------- */ | |
01854e69 | 351 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
1da177e4 | 352 | { |
4be44fcd LB |
353 | int state = 0; |
354 | u32 value = 0; | |
355 | u32 duty_mask = 0; | |
356 | u32 duty_value = 0; | |
1da177e4 | 357 | |
1da177e4 | 358 | if (!pr) |
d550d98d | 359 | return -EINVAL; |
1da177e4 LT |
360 | |
361 | if (!pr->flags.throttling) | |
d550d98d | 362 | return -ENODEV; |
1da177e4 LT |
363 | |
364 | pr->throttling.state = 0; | |
365 | ||
366 | duty_mask = pr->throttling.state_count - 1; | |
367 | ||
368 | duty_mask <<= pr->throttling.duty_offset; | |
369 | ||
370 | local_irq_disable(); | |
371 | ||
372 | value = inl(pr->throttling.address); | |
373 | ||
374 | /* | |
375 | * Compute the current throttling state when throttling is enabled | |
376 | * (bit 4 is on). | |
377 | */ | |
378 | if (value & 0x10) { | |
379 | duty_value = value & duty_mask; | |
380 | duty_value >>= pr->throttling.duty_offset; | |
381 | ||
382 | if (duty_value) | |
4be44fcd | 383 | state = pr->throttling.state_count - duty_value; |
1da177e4 LT |
384 | } |
385 | ||
386 | pr->throttling.state = state; | |
387 | ||
388 | local_irq_enable(); | |
389 | ||
390 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
391 | "Throttling state is T%d (%d%% throttling applied)\n", |
392 | state, pr->throttling.states[state].performance)); | |
1da177e4 | 393 | |
d550d98d | 394 | return 0; |
1da177e4 LT |
395 | } |
396 | ||
f79f06ab ZY |
397 | #ifdef CONFIG_X86 |
398 | static int acpi_throttling_rdmsr(struct acpi_processor *pr, | |
399 | acpi_integer * value) | |
400 | { | |
401 | struct cpuinfo_x86 *c; | |
402 | u64 msr_high, msr_low; | |
403 | unsigned int cpu; | |
404 | u64 msr = 0; | |
405 | int ret = -1; | |
406 | ||
407 | cpu = pr->id; | |
408 | c = &cpu_data(cpu); | |
409 | ||
410 | if ((c->x86_vendor != X86_VENDOR_INTEL) || | |
411 | !cpu_has(c, X86_FEATURE_ACPI)) { | |
412 | printk(KERN_ERR PREFIX | |
413 | "HARDWARE addr space,NOT supported yet\n"); | |
414 | } else { | |
415 | msr_low = 0; | |
416 | msr_high = 0; | |
357dc4c3 | 417 | rdmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
418 | (u32 *)&msr_low , (u32 *) &msr_high); |
419 | msr = (msr_high << 32) | msr_low; | |
420 | *value = (acpi_integer) msr; | |
421 | ret = 0; | |
422 | } | |
423 | return ret; | |
424 | } | |
425 | ||
426 | static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value) | |
427 | { | |
428 | struct cpuinfo_x86 *c; | |
429 | unsigned int cpu; | |
430 | int ret = -1; | |
431 | u64 msr; | |
432 | ||
433 | cpu = pr->id; | |
434 | c = &cpu_data(cpu); | |
435 | ||
436 | if ((c->x86_vendor != X86_VENDOR_INTEL) || | |
437 | !cpu_has(c, X86_FEATURE_ACPI)) { | |
438 | printk(KERN_ERR PREFIX | |
439 | "HARDWARE addr space,NOT supported yet\n"); | |
440 | } else { | |
441 | msr = value; | |
357dc4c3 | 442 | wrmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
443 | msr & 0xffffffff, msr >> 32); |
444 | ret = 0; | |
445 | } | |
446 | return ret; | |
447 | } | |
448 | #else | |
449 | static int acpi_throttling_rdmsr(struct acpi_processor *pr, | |
450 | acpi_integer * value) | |
451 | { | |
452 | printk(KERN_ERR PREFIX | |
453 | "HARDWARE addr space,NOT supported yet\n"); | |
454 | return -1; | |
455 | } | |
456 | ||
457 | static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value) | |
458 | { | |
459 | printk(KERN_ERR PREFIX | |
460 | "HARDWARE addr space,NOT supported yet\n"); | |
461 | return -1; | |
462 | } | |
463 | #endif | |
464 | ||
0753f6e0 ZY |
465 | static int acpi_read_throttling_status(struct acpi_processor *pr, |
466 | acpi_integer *value) | |
01854e69 | 467 | { |
9bcb2721 | 468 | u32 bit_width, bit_offset; |
0753f6e0 | 469 | u64 ptc_value; |
9bcb2721 | 470 | u64 ptc_mask; |
0753f6e0 ZY |
471 | struct acpi_processor_throttling *throttling; |
472 | int ret = -1; | |
473 | ||
474 | throttling = &pr->throttling; | |
01854e69 LY |
475 | switch (throttling->status_register.space_id) { |
476 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
0753f6e0 | 477 | ptc_value = 0; |
9bcb2721 ZY |
478 | bit_width = throttling->status_register.bit_width; |
479 | bit_offset = throttling->status_register.bit_offset; | |
480 | ||
ff55a9ce | 481 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
0753f6e0 | 482 | address, (u32 *) &ptc_value, |
9bcb2721 ZY |
483 | (u32) (bit_width + bit_offset)); |
484 | ptc_mask = (1 << bit_width) - 1; | |
485 | *value = (acpi_integer) ((ptc_value >> bit_offset) & ptc_mask); | |
0753f6e0 | 486 | ret = 0; |
01854e69 LY |
487 | break; |
488 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
f79f06ab | 489 | ret = acpi_throttling_rdmsr(pr, value); |
01854e69 LY |
490 | break; |
491 | default: | |
492 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 493 | (u32) (throttling->status_register.space_id)); |
01854e69 | 494 | } |
0753f6e0 | 495 | return ret; |
01854e69 LY |
496 | } |
497 | ||
0753f6e0 ZY |
498 | static int acpi_write_throttling_state(struct acpi_processor *pr, |
499 | acpi_integer value) | |
01854e69 | 500 | { |
9bcb2721 | 501 | u32 bit_width, bit_offset; |
0753f6e0 | 502 | u64 ptc_value; |
9bcb2721 | 503 | u64 ptc_mask; |
0753f6e0 | 504 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
505 | int ret = -1; |
506 | ||
0753f6e0 | 507 | throttling = &pr->throttling; |
01854e69 LY |
508 | switch (throttling->control_register.space_id) { |
509 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
510 | bit_width = throttling->control_register.bit_width; |
511 | bit_offset = throttling->control_register.bit_offset; | |
512 | ptc_mask = (1 << bit_width) - 1; | |
513 | ptc_value = value & ptc_mask; | |
514 | ||
ff55a9ce | 515 | acpi_os_write_port((acpi_io_address) throttling-> |
9bcb2721 ZY |
516 | control_register.address, |
517 | (u32) (ptc_value << bit_offset), | |
518 | (u32) (bit_width + bit_offset)); | |
01854e69 LY |
519 | ret = 0; |
520 | break; | |
521 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
f79f06ab | 522 | ret = acpi_throttling_wrmsr(pr, value); |
01854e69 LY |
523 | break; |
524 | default: | |
525 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 526 | (u32) (throttling->control_register.space_id)); |
01854e69 LY |
527 | } |
528 | return ret; | |
529 | } | |
530 | ||
0753f6e0 ZY |
531 | static int acpi_get_throttling_state(struct acpi_processor *pr, |
532 | acpi_integer value) | |
01854e69 LY |
533 | { |
534 | int i; | |
535 | ||
536 | for (i = 0; i < pr->throttling.state_count; i++) { | |
ff55a9ce LB |
537 | struct acpi_processor_tx_tss *tx = |
538 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
539 | states_tss[i]); | |
540 | if (tx->control == value) | |
01854e69 LY |
541 | break; |
542 | } | |
ff55a9ce LB |
543 | if (i > pr->throttling.state_count) |
544 | i = -1; | |
01854e69 LY |
545 | return i; |
546 | } | |
547 | ||
0753f6e0 ZY |
548 | static int acpi_get_throttling_value(struct acpi_processor *pr, |
549 | int state, acpi_integer *value) | |
01854e69 | 550 | { |
0753f6e0 ZY |
551 | int ret = -1; |
552 | ||
ff55a9ce LB |
553 | if (state >= 0 && state <= pr->throttling.state_count) { |
554 | struct acpi_processor_tx_tss *tx = | |
555 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
556 | states_tss[state]); | |
0753f6e0 ZY |
557 | *value = tx->control; |
558 | ret = 0; | |
01854e69 | 559 | } |
0753f6e0 | 560 | return ret; |
01854e69 LY |
561 | } |
562 | ||
563 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) | |
564 | { | |
565 | int state = 0; | |
0753f6e0 ZY |
566 | int ret; |
567 | acpi_integer value; | |
01854e69 | 568 | |
01854e69 LY |
569 | if (!pr) |
570 | return -EINVAL; | |
571 | ||
572 | if (!pr->flags.throttling) | |
573 | return -ENODEV; | |
574 | ||
575 | pr->throttling.state = 0; | |
357dc4c3 | 576 | |
0753f6e0 ZY |
577 | value = 0; |
578 | ret = acpi_read_throttling_status(pr, &value); | |
579 | if (ret >= 0) { | |
ff55a9ce | 580 | state = acpi_get_throttling_state(pr, value); |
01854e69 LY |
581 | pr->throttling.state = state; |
582 | } | |
01854e69 LY |
583 | |
584 | return 0; | |
585 | } | |
586 | ||
01854e69 LY |
587 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
588 | { | |
357dc4c3 ZY |
589 | cpumask_t saved_mask; |
590 | int ret; | |
591 | ||
592 | /* | |
593 | * Migrate task to the cpu pointed by pr. | |
594 | */ | |
595 | saved_mask = current->cpus_allowed; | |
596 | set_cpus_allowed(current, cpumask_of_cpu(pr->id)); | |
597 | ret = pr->throttling.acpi_processor_get_throttling(pr); | |
598 | /* restore the previous state */ | |
599 | set_cpus_allowed(current, saved_mask); | |
600 | ||
601 | return ret; | |
01854e69 LY |
602 | } |
603 | ||
22cc5019 ZY |
604 | static int acpi_processor_get_fadt_info(struct acpi_processor *pr) |
605 | { | |
606 | int i, step; | |
607 | ||
608 | if (!pr->throttling.address) { | |
609 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); | |
610 | return -EINVAL; | |
611 | } else if (!pr->throttling.duty_width) { | |
612 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); | |
613 | return -EINVAL; | |
614 | } | |
615 | /* TBD: Support duty_cycle values that span bit 4. */ | |
616 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { | |
617 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); | |
618 | return -EINVAL; | |
619 | } | |
620 | ||
621 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; | |
622 | ||
623 | /* | |
624 | * Compute state values. Note that throttling displays a linear power | |
625 | * performance relationship (at 50% performance the CPU will consume | |
626 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. | |
627 | */ | |
628 | ||
629 | step = (1000 / pr->throttling.state_count); | |
630 | ||
631 | for (i = 0; i < pr->throttling.state_count; i++) { | |
632 | pr->throttling.states[i].performance = 1000 - step * i; | |
633 | pr->throttling.states[i].power = 1000 - step * i; | |
634 | } | |
635 | return 0; | |
636 | } | |
637 | ||
6c5cf8aa AB |
638 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
639 | int state) | |
1da177e4 | 640 | { |
4be44fcd LB |
641 | u32 value = 0; |
642 | u32 duty_mask = 0; | |
643 | u32 duty_value = 0; | |
1da177e4 | 644 | |
1da177e4 | 645 | if (!pr) |
d550d98d | 646 | return -EINVAL; |
1da177e4 LT |
647 | |
648 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
d550d98d | 649 | return -EINVAL; |
1da177e4 LT |
650 | |
651 | if (!pr->flags.throttling) | |
d550d98d | 652 | return -ENODEV; |
1da177e4 LT |
653 | |
654 | if (state == pr->throttling.state) | |
d550d98d | 655 | return 0; |
1da177e4 | 656 | |
01854e69 LY |
657 | if (state < pr->throttling_platform_limit) |
658 | return -EPERM; | |
1da177e4 LT |
659 | /* |
660 | * Calculate the duty_value and duty_mask. | |
661 | */ | |
662 | if (state) { | |
663 | duty_value = pr->throttling.state_count - state; | |
664 | ||
665 | duty_value <<= pr->throttling.duty_offset; | |
666 | ||
667 | /* Used to clear all duty_value bits */ | |
668 | duty_mask = pr->throttling.state_count - 1; | |
669 | ||
cee324b1 | 670 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
1da177e4 LT |
671 | duty_mask = ~duty_mask; |
672 | } | |
673 | ||
674 | local_irq_disable(); | |
675 | ||
676 | /* | |
677 | * Disable throttling by writing a 0 to bit 4. Note that we must | |
678 | * turn it off before you can change the duty_value. | |
679 | */ | |
680 | value = inl(pr->throttling.address); | |
681 | if (value & 0x10) { | |
682 | value &= 0xFFFFFFEF; | |
683 | outl(value, pr->throttling.address); | |
684 | } | |
685 | ||
686 | /* | |
687 | * Write the new duty_value and then enable throttling. Note | |
688 | * that a state value of 0 leaves throttling disabled. | |
689 | */ | |
690 | if (state) { | |
691 | value &= duty_mask; | |
692 | value |= duty_value; | |
693 | outl(value, pr->throttling.address); | |
694 | ||
695 | value |= 0x00000010; | |
696 | outl(value, pr->throttling.address); | |
697 | } | |
698 | ||
699 | pr->throttling.state = state; | |
700 | ||
701 | local_irq_enable(); | |
702 | ||
703 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
704 | "Throttling state set to T%d (%d%%)\n", state, |
705 | (pr->throttling.states[state].performance ? pr-> | |
706 | throttling.states[state].performance / 10 : 0))); | |
1da177e4 | 707 | |
d550d98d | 708 | return 0; |
1da177e4 LT |
709 | } |
710 | ||
6c5cf8aa AB |
711 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
712 | int state) | |
01854e69 | 713 | { |
0753f6e0 ZY |
714 | int ret; |
715 | acpi_integer value; | |
01854e69 LY |
716 | |
717 | if (!pr) | |
718 | return -EINVAL; | |
719 | ||
720 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
721 | return -EINVAL; | |
722 | ||
723 | if (!pr->flags.throttling) | |
724 | return -ENODEV; | |
725 | ||
726 | if (state == pr->throttling.state) | |
727 | return 0; | |
728 | ||
729 | if (state < pr->throttling_platform_limit) | |
730 | return -EPERM; | |
731 | ||
0753f6e0 ZY |
732 | value = 0; |
733 | ret = acpi_get_throttling_value(pr, state, &value); | |
734 | if (ret >= 0) { | |
735 | acpi_write_throttling_state(pr, value); | |
01854e69 LY |
736 | pr->throttling.state = state; |
737 | } | |
01854e69 LY |
738 | |
739 | return 0; | |
740 | } | |
741 | ||
742 | int acpi_processor_set_throttling(struct acpi_processor *pr, int state) | |
743 | { | |
357dc4c3 ZY |
744 | cpumask_t saved_mask; |
745 | int ret; | |
746 | /* | |
747 | * Migrate task to the cpu pointed by pr. | |
748 | */ | |
749 | saved_mask = current->cpus_allowed; | |
750 | set_cpus_allowed(current, cpumask_of_cpu(pr->id)); | |
751 | ret = pr->throttling.acpi_processor_set_throttling(pr, state); | |
752 | /* restore the previous state */ | |
753 | set_cpus_allowed(current, saved_mask); | |
754 | return ret; | |
01854e69 LY |
755 | } |
756 | ||
4be44fcd | 757 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
1da177e4 | 758 | { |
4be44fcd | 759 | int result = 0; |
1da177e4 | 760 | |
1da177e4 | 761 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
762 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
763 | pr->throttling.address, | |
764 | pr->throttling.duty_offset, | |
765 | pr->throttling.duty_width)); | |
1da177e4 LT |
766 | |
767 | if (!pr) | |
d550d98d | 768 | return -EINVAL; |
1da177e4 | 769 | |
c30c620e LB |
770 | /* |
771 | * Evaluate _PTC, _TSS and _TPC | |
772 | * They must all be present or none of them can be used. | |
773 | */ | |
774 | if (acpi_processor_get_throttling_control(pr) || | |
775 | acpi_processor_get_throttling_states(pr) || | |
776 | acpi_processor_get_platform_limit(pr)) | |
777 | { | |
22cc5019 ZY |
778 | if (acpi_processor_get_fadt_info(pr)) |
779 | return 0; | |
ff55a9ce LB |
780 | pr->throttling.acpi_processor_get_throttling = |
781 | &acpi_processor_get_throttling_fadt; | |
782 | pr->throttling.acpi_processor_set_throttling = | |
783 | &acpi_processor_set_throttling_fadt; | |
01854e69 | 784 | } else { |
ff55a9ce LB |
785 | pr->throttling.acpi_processor_get_throttling = |
786 | &acpi_processor_get_throttling_ptc; | |
787 | pr->throttling.acpi_processor_set_throttling = | |
788 | &acpi_processor_set_throttling_ptc; | |
01854e69 | 789 | } |
1da177e4 | 790 | |
c30c620e LB |
791 | acpi_processor_get_tsd(pr); |
792 | ||
1da177e4 LT |
793 | /* |
794 | * PIIX4 Errata: We don't support throttling on the original PIIX4. | |
795 | * This shouldn't be an issue as few (if any) mobile systems ever | |
796 | * used this part. | |
797 | */ | |
798 | if (errata.piix4.throttle) { | |
799 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 800 | "Throttling not supported on PIIX4 A- or B-step\n")); |
d550d98d | 801 | return 0; |
1da177e4 LT |
802 | } |
803 | ||
1da177e4 | 804 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
4be44fcd | 805 | pr->throttling.state_count)); |
1da177e4 LT |
806 | |
807 | pr->flags.throttling = 1; | |
808 | ||
809 | /* | |
810 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. | |
811 | * thermal) decide to lower performance if it so chooses, but for now | |
812 | * we'll crank up the speed. | |
813 | */ | |
814 | ||
815 | result = acpi_processor_get_throttling(pr); | |
816 | if (result) | |
817 | goto end; | |
818 | ||
819 | if (pr->throttling.state) { | |
4be44fcd LB |
820 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
821 | "Disabling throttling (was T%d)\n", | |
822 | pr->throttling.state)); | |
1da177e4 LT |
823 | result = acpi_processor_set_throttling(pr, 0); |
824 | if (result) | |
825 | goto end; | |
826 | } | |
827 | ||
4be44fcd | 828 | end: |
1da177e4 LT |
829 | if (result) |
830 | pr->flags.throttling = 0; | |
831 | ||
d550d98d | 832 | return result; |
1da177e4 LT |
833 | } |
834 | ||
1da177e4 LT |
835 | /* proc interface */ |
836 | ||
4be44fcd LB |
837 | static int acpi_processor_throttling_seq_show(struct seq_file *seq, |
838 | void *offset) | |
1da177e4 | 839 | { |
50dd0969 | 840 | struct acpi_processor *pr = seq->private; |
4be44fcd LB |
841 | int i = 0; |
842 | int result = 0; | |
1da177e4 | 843 | |
1da177e4 LT |
844 | if (!pr) |
845 | goto end; | |
846 | ||
847 | if (!(pr->throttling.state_count > 0)) { | |
848 | seq_puts(seq, "<not supported>\n"); | |
849 | goto end; | |
850 | } | |
851 | ||
852 | result = acpi_processor_get_throttling(pr); | |
853 | ||
854 | if (result) { | |
4be44fcd LB |
855 | seq_puts(seq, |
856 | "Could not determine current throttling state.\n"); | |
1da177e4 LT |
857 | goto end; |
858 | } | |
859 | ||
860 | seq_printf(seq, "state count: %d\n" | |
01854e69 | 861 | "active state: T%d\n" |
ff55a9ce | 862 | "state available: T%d to T%d\n", |
01854e69 | 863 | pr->throttling.state_count, pr->throttling.state, |
ff55a9ce LB |
864 | pr->throttling_platform_limit, |
865 | pr->throttling.state_count - 1); | |
1da177e4 LT |
866 | |
867 | seq_puts(seq, "states:\n"); | |
3cc2649b LY |
868 | if (pr->throttling.acpi_processor_get_throttling == |
869 | acpi_processor_get_throttling_fadt) { | |
01854e69 LY |
870 | for (i = 0; i < pr->throttling.state_count; i++) |
871 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
872 | (i == pr->throttling.state ? '*' : ' '), i, |
873 | (pr->throttling.states[i].performance ? pr-> | |
874 | throttling.states[i].performance / 10 : 0)); | |
3cc2649b | 875 | } else { |
01854e69 LY |
876 | for (i = 0; i < pr->throttling.state_count; i++) |
877 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
878 | (i == pr->throttling.state ? '*' : ' '), i, |
879 | (int)pr->throttling.states_tss[i]. | |
880 | freqpercentage); | |
3cc2649b | 881 | } |
1da177e4 | 882 | |
4be44fcd | 883 | end: |
d550d98d | 884 | return 0; |
1da177e4 LT |
885 | } |
886 | ||
4be44fcd LB |
887 | static int acpi_processor_throttling_open_fs(struct inode *inode, |
888 | struct file *file) | |
1da177e4 LT |
889 | { |
890 | return single_open(file, acpi_processor_throttling_seq_show, | |
4be44fcd | 891 | PDE(inode)->data); |
1da177e4 LT |
892 | } |
893 | ||
ff55a9ce | 894 | static ssize_t acpi_processor_write_throttling(struct file *file, |
757b1866 AB |
895 | const char __user * buffer, |
896 | size_t count, loff_t * data) | |
1da177e4 | 897 | { |
4be44fcd | 898 | int result = 0; |
50dd0969 JE |
899 | struct seq_file *m = file->private_data; |
900 | struct acpi_processor *pr = m->private; | |
4be44fcd | 901 | char state_string[12] = { '\0' }; |
1da177e4 | 902 | |
1da177e4 | 903 | if (!pr || (count > sizeof(state_string) - 1)) |
d550d98d | 904 | return -EINVAL; |
1da177e4 LT |
905 | |
906 | if (copy_from_user(state_string, buffer, count)) | |
d550d98d | 907 | return -EFAULT; |
1da177e4 LT |
908 | |
909 | state_string[count] = '\0'; | |
910 | ||
911 | result = acpi_processor_set_throttling(pr, | |
4be44fcd LB |
912 | simple_strtoul(state_string, |
913 | NULL, 0)); | |
1da177e4 | 914 | if (result) |
d550d98d | 915 | return result; |
1da177e4 | 916 | |
d550d98d | 917 | return count; |
1da177e4 LT |
918 | } |
919 | ||
920 | struct file_operations acpi_processor_throttling_fops = { | |
4be44fcd LB |
921 | .open = acpi_processor_throttling_open_fs, |
922 | .read = seq_read, | |
d479e908 | 923 | .write = acpi_processor_write_throttling, |
4be44fcd LB |
924 | .llseek = seq_lseek, |
925 | .release = single_release, | |
1da177e4 | 926 | }; |