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1da177e4 LT |
1 | /* |
2 | * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $) | |
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 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or (at | |
16 | * your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, but | |
19 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
21 | * General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License along | |
24 | * with this program; if not, write to the Free Software Foundation, Inc., | |
25 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
26 | * | |
27 | */ | |
28 | ||
1da177e4 LT |
29 | #include <linux/kernel.h> |
30 | #include <linux/module.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/cpufreq.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
8b48463f LZ |
34 | #include <linux/acpi.h> |
35 | #include <acpi/processor.h> | |
16be87ea | 36 | #ifdef CONFIG_X86 |
910dfae2 | 37 | #include <asm/cpufeature.h> |
16be87ea | 38 | #endif |
1da177e4 | 39 | |
a192a958 LB |
40 | #define PREFIX "ACPI: " |
41 | ||
1da177e4 | 42 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 LT |
43 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
44 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
f52fd66d | 45 | ACPI_MODULE_NAME("processor_perflib"); |
1da177e4 | 46 | |
65c19bbd | 47 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 LT |
48 | |
49 | /* | |
50 | * _PPC support is implemented as a CPUfreq policy notifier: | |
51 | * This means each time a CPUfreq driver registered also with | |
52 | * the ACPI core is asked to change the speed policy, the maximum | |
53 | * value is adjusted so that it is within the platform limit. | |
54 | * | |
55 | * Also, when a new platform limit value is detected, the CPUfreq | |
56 | * policy is adjusted accordingly. | |
57 | */ | |
58 | ||
a1531acd TR |
59 | /* ignore_ppc: |
60 | * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet | |
61 | * ignore _PPC | |
62 | * 0 -> cpufreq low level drivers initialized -> consider _PPC values | |
63 | * 1 -> ignore _PPC totally -> forced by user through boot param | |
64 | */ | |
9f497bcc | 65 | static int ignore_ppc = -1; |
613e5f33 | 66 | module_param(ignore_ppc, int, 0644); |
623b78c3 TR |
67 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
68 | "limited by BIOS, this should help"); | |
69 | ||
1da177e4 LT |
70 | #define PPC_REGISTERED 1 |
71 | #define PPC_IN_USE 2 | |
72 | ||
a1531acd | 73 | static int acpi_processor_ppc_status; |
1da177e4 LT |
74 | |
75 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 76 | unsigned long event, void *data) |
1da177e4 LT |
77 | { |
78 | struct cpufreq_policy *policy = data; | |
79 | struct acpi_processor *pr; | |
80 | unsigned int ppc = 0; | |
81 | ||
a1531acd TR |
82 | if (event == CPUFREQ_START && ignore_ppc <= 0) { |
83 | ignore_ppc = 0; | |
84 | return 0; | |
85 | } | |
86 | ||
623b78c3 TR |
87 | if (ignore_ppc) |
88 | return 0; | |
89 | ||
1da177e4 | 90 | if (event != CPUFREQ_INCOMPATIBLE) |
9b67c5d4 TR |
91 | return 0; |
92 | ||
93 | mutex_lock(&performance_mutex); | |
1da177e4 | 94 | |
706546d0 | 95 | pr = per_cpu(processors, policy->cpu); |
1da177e4 LT |
96 | if (!pr || !pr->performance) |
97 | goto out; | |
98 | ||
4be44fcd | 99 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 100 | |
0916bd3e | 101 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
102 | goto out; |
103 | ||
104 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
105 | pr->performance->states[ppc]. |
106 | core_frequency * 1000); | |
1da177e4 | 107 | |
4be44fcd | 108 | out: |
65c19bbd | 109 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
110 | |
111 | return 0; | |
112 | } | |
113 | ||
1da177e4 LT |
114 | static struct notifier_block acpi_ppc_notifier_block = { |
115 | .notifier_call = acpi_processor_ppc_notifier, | |
116 | }; | |
117 | ||
4be44fcd | 118 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 119 | { |
4be44fcd | 120 | acpi_status status = 0; |
27663c58 | 121 | unsigned long long ppc = 0; |
1da177e4 | 122 | |
1da177e4 LT |
123 | |
124 | if (!pr) | |
d550d98d | 125 | return -EINVAL; |
1da177e4 LT |
126 | |
127 | /* | |
128 | * _PPC indicates the maximum state currently supported by the platform | |
129 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
130 | */ | |
131 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
132 | ||
133 | if (status != AE_NOT_FOUND) | |
134 | acpi_processor_ppc_status |= PPC_IN_USE; | |
135 | ||
4be44fcd | 136 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 137 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 138 | return -ENODEV; |
1da177e4 LT |
139 | } |
140 | ||
2d06d8c4 | 141 | pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
919158d1 TR |
142 | (int)ppc, ppc ? "" : "not"); |
143 | ||
4be44fcd | 144 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 145 | |
d550d98d | 146 | return 0; |
1da177e4 LT |
147 | } |
148 | ||
d81c45e1 ZY |
149 | #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
150 | /* | |
151 | * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status | |
152 | * @handle: ACPI processor handle | |
153 | * @status: the status code of _PPC evaluation | |
154 | * 0: success. OSPM is now using the performance state specificed. | |
155 | * 1: failure. OSPM has not changed the number of P-states in use | |
156 | */ | |
157 | static void acpi_processor_ppc_ost(acpi_handle handle, int status) | |
158 | { | |
4a6172a4 JL |
159 | if (acpi_has_method(handle, "_OST")) |
160 | acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE, | |
161 | status, NULL); | |
d81c45e1 ZY |
162 | } |
163 | ||
164 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) | |
1da177e4 | 165 | { |
623b78c3 TR |
166 | int ret; |
167 | ||
d81c45e1 ZY |
168 | if (ignore_ppc) { |
169 | /* | |
170 | * Only when it is notification event, the _OST object | |
171 | * will be evaluated. Otherwise it is skipped. | |
172 | */ | |
173 | if (event_flag) | |
174 | acpi_processor_ppc_ost(pr->handle, 1); | |
623b78c3 | 175 | return 0; |
d81c45e1 | 176 | } |
623b78c3 TR |
177 | |
178 | ret = acpi_processor_get_platform_limit(pr); | |
d81c45e1 ZY |
179 | /* |
180 | * Only when it is notification event, the _OST object | |
181 | * will be evaluated. Otherwise it is skipped. | |
182 | */ | |
183 | if (event_flag) { | |
184 | if (ret < 0) | |
185 | acpi_processor_ppc_ost(pr->handle, 1); | |
186 | else | |
187 | acpi_processor_ppc_ost(pr->handle, 0); | |
188 | } | |
1da177e4 LT |
189 | if (ret < 0) |
190 | return (ret); | |
191 | else | |
192 | return cpufreq_update_policy(pr->id); | |
193 | } | |
194 | ||
e2f74f35 TR |
195 | int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) |
196 | { | |
197 | struct acpi_processor *pr; | |
198 | ||
199 | pr = per_cpu(processors, cpu); | |
200 | if (!pr || !pr->performance || !pr->performance->state_count) | |
201 | return -ENODEV; | |
202 | *limit = pr->performance->states[pr->performance_platform_limit]. | |
203 | core_frequency * 1000; | |
204 | return 0; | |
205 | } | |
206 | EXPORT_SYMBOL(acpi_processor_get_bios_limit); | |
207 | ||
4be44fcd LB |
208 | void acpi_processor_ppc_init(void) |
209 | { | |
210 | if (!cpufreq_register_notifier | |
211 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
212 | acpi_processor_ppc_status |= PPC_REGISTERED; |
213 | else | |
4be44fcd LB |
214 | printk(KERN_DEBUG |
215 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
216 | } |
217 | ||
4be44fcd LB |
218 | void acpi_processor_ppc_exit(void) |
219 | { | |
1da177e4 | 220 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
221 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
222 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
223 | |
224 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
225 | } | |
226 | ||
4be44fcd | 227 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 228 | { |
4be44fcd LB |
229 | int result = 0; |
230 | acpi_status status = 0; | |
231 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
232 | union acpi_object *pct = NULL; | |
233 | union acpi_object obj = { 0 }; | |
1da177e4 | 234 | |
1da177e4 LT |
235 | |
236 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 237 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 238 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 239 | return -ENODEV; |
1da177e4 LT |
240 | } |
241 | ||
4be44fcd | 242 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 243 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 244 | || (pct->package.count != 2)) { |
6468463a | 245 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
246 | result = -EFAULT; |
247 | goto end; | |
248 | } | |
249 | ||
250 | /* | |
251 | * control_register | |
252 | */ | |
253 | ||
254 | obj = pct->package.elements[0]; | |
255 | ||
256 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
257 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
258 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 259 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
260 | result = -EFAULT; |
261 | goto end; | |
262 | } | |
4be44fcd LB |
263 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
264 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
265 | |
266 | /* | |
267 | * status_register | |
268 | */ | |
269 | ||
270 | obj = pct->package.elements[1]; | |
271 | ||
272 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
273 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
274 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 275 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
276 | result = -EFAULT; |
277 | goto end; | |
278 | } | |
279 | ||
4be44fcd LB |
280 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
281 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 282 | |
4be44fcd | 283 | end: |
02438d87 | 284 | kfree(buffer.pointer); |
1da177e4 | 285 | |
d550d98d | 286 | return result; |
1da177e4 LT |
287 | } |
288 | ||
f594065f MG |
289 | #ifdef CONFIG_X86 |
290 | /* | |
291 | * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding | |
292 | * in their ACPI data. Calculate the real values and fix up the _PSS data. | |
293 | */ | |
294 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) | |
295 | { | |
296 | u32 hi, lo, fid, did; | |
297 | int index = px->control & 0x00000007; | |
298 | ||
299 | if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) | |
300 | return; | |
301 | ||
302 | if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) | |
303 | || boot_cpu_data.x86 == 0x11) { | |
304 | rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); | |
9855d8ce SB |
305 | /* |
306 | * MSR C001_0064+: | |
307 | * Bit 63: PstateEn. Read-write. If set, the P-state is valid. | |
308 | */ | |
309 | if (!(hi & BIT(31))) | |
310 | return; | |
311 | ||
f594065f MG |
312 | fid = lo & 0x3f; |
313 | did = (lo >> 6) & 7; | |
314 | if (boot_cpu_data.x86 == 0x10) | |
315 | px->core_frequency = (100 * (fid + 0x10)) >> did; | |
316 | else | |
317 | px->core_frequency = (100 * (fid + 8)) >> did; | |
318 | } | |
319 | } | |
320 | #else | |
321 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; | |
322 | #endif | |
323 | ||
4be44fcd | 324 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 325 | { |
4be44fcd LB |
326 | int result = 0; |
327 | acpi_status status = AE_OK; | |
328 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
329 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
330 | struct acpi_buffer state = { 0, NULL }; | |
331 | union acpi_object *pss = NULL; | |
332 | int i; | |
d8e725f3 | 333 | int last_invalid = -1; |
1da177e4 | 334 | |
1da177e4 LT |
335 | |
336 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 337 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 338 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 339 | return -ENODEV; |
1da177e4 LT |
340 | } |
341 | ||
50dd0969 | 342 | pss = buffer.pointer; |
1da177e4 | 343 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 344 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
345 | result = -EFAULT; |
346 | goto end; | |
347 | } | |
348 | ||
349 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 350 | pss->package.count)); |
1da177e4 LT |
351 | |
352 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
353 | pr->performance->states = |
354 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
355 | GFP_KERNEL); | |
1da177e4 LT |
356 | if (!pr->performance->states) { |
357 | result = -ENOMEM; | |
358 | goto end; | |
359 | } | |
360 | ||
361 | for (i = 0; i < pr->performance->state_count; i++) { | |
362 | ||
363 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
364 | ||
365 | state.length = sizeof(struct acpi_processor_px); | |
366 | state.pointer = px; | |
367 | ||
368 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
369 | ||
370 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 371 | &format, &state); |
1da177e4 | 372 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 373 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
374 | result = -EFAULT; |
375 | kfree(pr->performance->states); | |
376 | goto end; | |
377 | } | |
378 | ||
f594065f MG |
379 | amd_fixup_frequency(px, i); |
380 | ||
1da177e4 | 381 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
382 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
383 | i, | |
384 | (u32) px->core_frequency, | |
385 | (u32) px->power, | |
386 | (u32) px->transition_latency, | |
387 | (u32) px->bus_master_latency, | |
388 | (u32) px->control, (u32) px->status)); | |
1da177e4 | 389 | |
34d531e6 LB |
390 | /* |
391 | * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq | |
392 | */ | |
393 | if (!px->core_frequency || | |
394 | ((u32)(px->core_frequency * 1000) != | |
395 | (px->core_frequency * 1000))) { | |
396 | printk(KERN_ERR FW_BUG PREFIX | |
d8e725f3 MAC |
397 | "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", |
398 | pr->id, px->core_frequency); | |
399 | if (last_invalid == -1) | |
400 | last_invalid = i; | |
401 | } else { | |
402 | if (last_invalid != -1) { | |
403 | /* | |
404 | * Copy this valid entry over last_invalid entry | |
405 | */ | |
406 | memcpy(&(pr->performance->states[last_invalid]), | |
407 | px, sizeof(struct acpi_processor_px)); | |
408 | ++last_invalid; | |
409 | } | |
1da177e4 LT |
410 | } |
411 | } | |
412 | ||
d8e725f3 MAC |
413 | if (last_invalid == 0) { |
414 | printk(KERN_ERR FW_BUG PREFIX | |
415 | "No valid BIOS _PSS frequency found for processor %d\n", pr->id); | |
416 | result = -EFAULT; | |
417 | kfree(pr->performance->states); | |
418 | pr->performance->states = NULL; | |
419 | } | |
420 | ||
421 | if (last_invalid > 0) | |
422 | pr->performance->state_count = last_invalid; | |
423 | ||
4be44fcd | 424 | end: |
02438d87 | 425 | kfree(buffer.pointer); |
1da177e4 | 426 | |
d550d98d | 427 | return result; |
1da177e4 LT |
428 | } |
429 | ||
c705c78c | 430 | int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 431 | { |
4be44fcd | 432 | int result = 0; |
1da177e4 | 433 | |
1da177e4 | 434 | if (!pr || !pr->performance || !pr->handle) |
d550d98d | 435 | return -EINVAL; |
1da177e4 | 436 | |
952c63e9 | 437 | if (!acpi_has_method(pr->handle, "_PCT")) { |
1da177e4 | 438 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd | 439 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 440 | return -ENODEV; |
1da177e4 LT |
441 | } |
442 | ||
443 | result = acpi_processor_get_performance_control(pr); | |
444 | if (result) | |
910dfae2 | 445 | goto update_bios; |
1da177e4 LT |
446 | |
447 | result = acpi_processor_get_performance_states(pr); | |
448 | if (result) | |
910dfae2 | 449 | goto update_bios; |
1da177e4 | 450 | |
455c0d71 DW |
451 | /* We need to call _PPC once when cpufreq starts */ |
452 | if (ignore_ppc != 1) | |
453 | result = acpi_processor_get_platform_limit(pr); | |
454 | ||
455 | return result; | |
910dfae2 TR |
456 | |
457 | /* | |
458 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that | |
459 | * the BIOS is older than the CPU and does not know its frequencies | |
460 | */ | |
461 | update_bios: | |
16be87ea | 462 | #ifdef CONFIG_X86 |
952c63e9 | 463 | if (acpi_has_method(pr->handle, "_PPC")) { |
910dfae2 TR |
464 | if(boot_cpu_has(X86_FEATURE_EST)) |
465 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " | |
466 | "frequency support\n"); | |
467 | } | |
16be87ea | 468 | #endif |
910dfae2 | 469 | return result; |
1da177e4 | 470 | } |
c705c78c | 471 | EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); |
4be44fcd LB |
472 | int acpi_processor_notify_smm(struct module *calling_module) |
473 | { | |
474 | acpi_status status; | |
475 | static int is_done = 0; | |
1da177e4 | 476 | |
1da177e4 LT |
477 | |
478 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 479 | return -EBUSY; |
1da177e4 LT |
480 | |
481 | if (!try_module_get(calling_module)) | |
d550d98d | 482 | return -EINVAL; |
1da177e4 | 483 | |
58f87ed0 LDM |
484 | /* is_done is set to negative if an error occurred, |
485 | * and to postitive if _no_ error occurred, but SMM | |
1da177e4 LT |
486 | * was already notified. This avoids double notification |
487 | * which might lead to unexpected results... | |
488 | */ | |
489 | if (is_done > 0) { | |
490 | module_put(calling_module); | |
d550d98d | 491 | return 0; |
4be44fcd | 492 | } else if (is_done < 0) { |
1da177e4 | 493 | module_put(calling_module); |
d550d98d | 494 | return is_done; |
1da177e4 LT |
495 | } |
496 | ||
497 | is_done = -EIO; | |
498 | ||
ad71860a | 499 | /* Can't write pstate_control to smi_command if either value is zero */ |
cee324b1 | 500 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
ad71860a | 501 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 502 | module_put(calling_module); |
d550d98d | 503 | return 0; |
1da177e4 LT |
504 | } |
505 | ||
4be44fcd | 506 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a | 507 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
cee324b1 | 508 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
1da177e4 | 509 | |
cee324b1 AS |
510 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
511 | (u32) acpi_gbl_FADT.pstate_control, 8); | |
4be44fcd | 512 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 513 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a | 514 | "Failed to write pstate_control [0x%x] to " |
cee324b1 AS |
515 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
516 | acpi_gbl_FADT.smi_command)); | |
1da177e4 | 517 | module_put(calling_module); |
d550d98d | 518 | return status; |
1da177e4 LT |
519 | } |
520 | ||
521 | /* Success. If there's no _PPC, we need to fear nothing, so | |
522 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
523 | is_done = 1; | |
524 | ||
525 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
526 | module_put(calling_module); | |
527 | ||
d550d98d | 528 | return 0; |
1da177e4 | 529 | } |
1da177e4 | 530 | |
4be44fcd | 531 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 | 532 | |
3b2d9942 VP |
533 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
534 | { | |
535 | int result = 0; | |
536 | acpi_status status = AE_OK; | |
537 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
538 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
539 | struct acpi_buffer state = {0, NULL}; | |
540 | union acpi_object *psd = NULL; | |
541 | struct acpi_psd_package *pdomain; | |
542 | ||
3b2d9942 VP |
543 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
544 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 545 | return -ENODEV; |
3b2d9942 VP |
546 | } |
547 | ||
50dd0969 | 548 | psd = buffer.pointer; |
3b2d9942 | 549 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
55ac9a01 | 550 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
551 | result = -EFAULT; |
552 | goto end; | |
553 | } | |
554 | ||
555 | if (psd->package.count != 1) { | |
55ac9a01 | 556 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
557 | result = -EFAULT; |
558 | goto end; | |
559 | } | |
560 | ||
561 | pdomain = &(pr->performance->domain_info); | |
562 | ||
563 | state.length = sizeof(struct acpi_psd_package); | |
564 | state.pointer = pdomain; | |
565 | ||
566 | status = acpi_extract_package(&(psd->package.elements[0]), | |
567 | &format, &state); | |
568 | if (ACPI_FAILURE(status)) { | |
55ac9a01 | 569 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
570 | result = -EFAULT; |
571 | goto end; | |
572 | } | |
573 | ||
574 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
55ac9a01 | 575 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
3b2d9942 VP |
576 | result = -EFAULT; |
577 | goto end; | |
578 | } | |
579 | ||
580 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
55ac9a01 | 581 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
3b2d9942 VP |
582 | result = -EFAULT; |
583 | goto end; | |
584 | } | |
585 | ||
e1eb4779 SG |
586 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
587 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
588 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
589 | printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); | |
590 | result = -EFAULT; | |
591 | goto end; | |
592 | } | |
3b2d9942 | 593 | end: |
02438d87 | 594 | kfree(buffer.pointer); |
9011bff4 | 595 | return result; |
3b2d9942 VP |
596 | } |
597 | ||
598 | int acpi_processor_preregister_performance( | |
a29d8b8e | 599 | struct acpi_processor_performance __percpu *performance) |
3b2d9942 | 600 | { |
09d5ca80 | 601 | int count_target; |
3b2d9942 VP |
602 | int retval = 0; |
603 | unsigned int i, j; | |
2fdf66b4 | 604 | cpumask_var_t covered_cpus; |
3b2d9942 VP |
605 | struct acpi_processor *pr; |
606 | struct acpi_psd_package *pdomain; | |
607 | struct acpi_processor *match_pr; | |
608 | struct acpi_psd_package *match_pdomain; | |
609 | ||
79f55997 | 610 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
611 | return -ENOMEM; |
612 | ||
785fcccd | 613 | mutex_lock(&performance_mutex); |
3b2d9942 | 614 | |
e1eb4779 SG |
615 | /* |
616 | * Check if another driver has already registered, and abort before | |
617 | * changing pr->performance if it has. Check input data as well. | |
618 | */ | |
193de0c7 | 619 | for_each_possible_cpu(i) { |
706546d0 | 620 | pr = per_cpu(processors, i); |
3b2d9942 VP |
621 | if (!pr) { |
622 | /* Look only at processors in ACPI namespace */ | |
623 | continue; | |
624 | } | |
625 | ||
626 | if (pr->performance) { | |
627 | retval = -EBUSY; | |
e1eb4779 | 628 | goto err_out; |
3b2d9942 VP |
629 | } |
630 | ||
b36128c8 | 631 | if (!performance || !per_cpu_ptr(performance, i)) { |
3b2d9942 | 632 | retval = -EINVAL; |
e1eb4779 | 633 | goto err_out; |
3b2d9942 | 634 | } |
e1eb4779 SG |
635 | } |
636 | ||
637 | /* Call _PSD for all CPUs */ | |
638 | for_each_possible_cpu(i) { | |
639 | pr = per_cpu(processors, i); | |
640 | if (!pr) | |
641 | continue; | |
3b2d9942 | 642 | |
b36128c8 | 643 | pr->performance = per_cpu_ptr(performance, i); |
2fdf66b4 | 644 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
3b2d9942 VP |
645 | if (acpi_processor_get_psd(pr)) { |
646 | retval = -EINVAL; | |
647 | continue; | |
648 | } | |
649 | } | |
650 | if (retval) | |
651 | goto err_ret; | |
652 | ||
653 | /* | |
654 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
655 | * domain info. | |
656 | */ | |
193de0c7 | 657 | for_each_possible_cpu(i) { |
706546d0 | 658 | pr = per_cpu(processors, i); |
3b2d9942 VP |
659 | if (!pr) |
660 | continue; | |
661 | ||
2fdf66b4 | 662 | if (cpumask_test_cpu(i, covered_cpus)) |
3b2d9942 VP |
663 | continue; |
664 | ||
665 | pdomain = &(pr->performance->domain_info); | |
2fdf66b4 RR |
666 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
667 | cpumask_set_cpu(i, covered_cpus); | |
3b2d9942 VP |
668 | if (pdomain->num_processors <= 1) |
669 | continue; | |
670 | ||
671 | /* Validate the Domain info */ | |
672 | count_target = pdomain->num_processors; | |
46f18e3a | 673 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 674 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
675 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
676 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
677 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 678 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 679 | |
193de0c7 | 680 | for_each_possible_cpu(j) { |
3b2d9942 VP |
681 | if (i == j) |
682 | continue; | |
683 | ||
706546d0 | 684 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
685 | if (!match_pr) |
686 | continue; | |
687 | ||
688 | match_pdomain = &(match_pr->performance->domain_info); | |
689 | if (match_pdomain->domain != pdomain->domain) | |
690 | continue; | |
691 | ||
692 | /* Here i and j are in the same domain */ | |
693 | ||
694 | if (match_pdomain->num_processors != count_target) { | |
695 | retval = -EINVAL; | |
696 | goto err_ret; | |
697 | } | |
698 | ||
699 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
700 | retval = -EINVAL; | |
701 | goto err_ret; | |
702 | } | |
703 | ||
2fdf66b4 RR |
704 | cpumask_set_cpu(j, covered_cpus); |
705 | cpumask_set_cpu(j, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
706 | } |
707 | ||
193de0c7 | 708 | for_each_possible_cpu(j) { |
3b2d9942 VP |
709 | if (i == j) |
710 | continue; | |
711 | ||
706546d0 | 712 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
713 | if (!match_pr) |
714 | continue; | |
715 | ||
716 | match_pdomain = &(match_pr->performance->domain_info); | |
717 | if (match_pdomain->domain != pdomain->domain) | |
718 | continue; | |
719 | ||
720 | match_pr->performance->shared_type = | |
721 | pr->performance->shared_type; | |
2fdf66b4 RR |
722 | cpumask_copy(match_pr->performance->shared_cpu_map, |
723 | pr->performance->shared_cpu_map); | |
3b2d9942 VP |
724 | } |
725 | } | |
726 | ||
727 | err_ret: | |
193de0c7 | 728 | for_each_possible_cpu(i) { |
706546d0 | 729 | pr = per_cpu(processors, i); |
3b2d9942 VP |
730 | if (!pr || !pr->performance) |
731 | continue; | |
732 | ||
733 | /* Assume no coordination on any error parsing domain info */ | |
734 | if (retval) { | |
2fdf66b4 RR |
735 | cpumask_clear(pr->performance->shared_cpu_map); |
736 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
737 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
738 | } | |
739 | pr->performance = NULL; /* Will be set for real in register */ | |
740 | } | |
741 | ||
e1eb4779 | 742 | err_out: |
785fcccd | 743 | mutex_unlock(&performance_mutex); |
2fdf66b4 | 744 | free_cpumask_var(covered_cpus); |
9011bff4 | 745 | return retval; |
3b2d9942 VP |
746 | } |
747 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
748 | ||
1da177e4 | 749 | int |
4be44fcd LB |
750 | acpi_processor_register_performance(struct acpi_processor_performance |
751 | *performance, unsigned int cpu) | |
1da177e4 LT |
752 | { |
753 | struct acpi_processor *pr; | |
754 | ||
1da177e4 | 755 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
d550d98d | 756 | return -EINVAL; |
1da177e4 | 757 | |
65c19bbd | 758 | mutex_lock(&performance_mutex); |
1da177e4 | 759 | |
706546d0 | 760 | pr = per_cpu(processors, cpu); |
1da177e4 | 761 | if (!pr) { |
65c19bbd | 762 | mutex_unlock(&performance_mutex); |
d550d98d | 763 | return -ENODEV; |
1da177e4 LT |
764 | } |
765 | ||
766 | if (pr->performance) { | |
65c19bbd | 767 | mutex_unlock(&performance_mutex); |
d550d98d | 768 | return -EBUSY; |
1da177e4 LT |
769 | } |
770 | ||
a913f507 AM |
771 | WARN_ON(!performance); |
772 | ||
1da177e4 LT |
773 | pr->performance = performance; |
774 | ||
775 | if (acpi_processor_get_performance_info(pr)) { | |
776 | pr->performance = NULL; | |
65c19bbd | 777 | mutex_unlock(&performance_mutex); |
d550d98d | 778 | return -EIO; |
1da177e4 LT |
779 | } |
780 | ||
65c19bbd | 781 | mutex_unlock(&performance_mutex); |
d550d98d | 782 | return 0; |
1da177e4 | 783 | } |
1da177e4 | 784 | |
4be44fcd | 785 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
786 | |
787 | void | |
4be44fcd LB |
788 | acpi_processor_unregister_performance(struct acpi_processor_performance |
789 | *performance, unsigned int cpu) | |
1da177e4 LT |
790 | { |
791 | struct acpi_processor *pr; | |
792 | ||
65c19bbd | 793 | mutex_lock(&performance_mutex); |
1da177e4 | 794 | |
706546d0 | 795 | pr = per_cpu(processors, cpu); |
1da177e4 | 796 | if (!pr) { |
65c19bbd | 797 | mutex_unlock(&performance_mutex); |
d550d98d | 798 | return; |
1da177e4 LT |
799 | } |
800 | ||
a913f507 AM |
801 | if (pr->performance) |
802 | kfree(pr->performance->states); | |
1da177e4 LT |
803 | pr->performance = NULL; |
804 | ||
65c19bbd | 805 | mutex_unlock(&performance_mutex); |
1da177e4 | 806 | |
d550d98d | 807 | return; |
1da177e4 | 808 | } |
4be44fcd | 809 | |
1da177e4 | 810 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |