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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> |
1da177e4 | 34 | |
16be87ea | 35 | #ifdef CONFIG_X86 |
910dfae2 | 36 | #include <asm/cpufeature.h> |
16be87ea | 37 | #endif |
1da177e4 LT |
38 | |
39 | #include <acpi/acpi_bus.h> | |
89595b8f | 40 | #include <acpi/acpi_drivers.h> |
1da177e4 LT |
41 | #include <acpi/processor.h> |
42 | ||
a192a958 LB |
43 | #define PREFIX "ACPI: " |
44 | ||
1da177e4 | 45 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 LT |
46 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
47 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
f52fd66d | 48 | ACPI_MODULE_NAME("processor_perflib"); |
1da177e4 | 49 | |
65c19bbd | 50 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 LT |
51 | |
52 | /* | |
53 | * _PPC support is implemented as a CPUfreq policy notifier: | |
54 | * This means each time a CPUfreq driver registered also with | |
55 | * the ACPI core is asked to change the speed policy, the maximum | |
56 | * value is adjusted so that it is within the platform limit. | |
57 | * | |
58 | * Also, when a new platform limit value is detected, the CPUfreq | |
59 | * policy is adjusted accordingly. | |
60 | */ | |
61 | ||
a1531acd TR |
62 | /* ignore_ppc: |
63 | * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet | |
64 | * ignore _PPC | |
65 | * 0 -> cpufreq low level drivers initialized -> consider _PPC values | |
66 | * 1 -> ignore _PPC totally -> forced by user through boot param | |
67 | */ | |
9f497bcc | 68 | static int ignore_ppc = -1; |
613e5f33 | 69 | module_param(ignore_ppc, int, 0644); |
623b78c3 TR |
70 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
71 | "limited by BIOS, this should help"); | |
72 | ||
1da177e4 LT |
73 | #define PPC_REGISTERED 1 |
74 | #define PPC_IN_USE 2 | |
75 | ||
a1531acd | 76 | static int acpi_processor_ppc_status; |
1da177e4 LT |
77 | |
78 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 79 | unsigned long event, void *data) |
1da177e4 LT |
80 | { |
81 | struct cpufreq_policy *policy = data; | |
82 | struct acpi_processor *pr; | |
83 | unsigned int ppc = 0; | |
84 | ||
a1531acd TR |
85 | if (event == CPUFREQ_START && ignore_ppc <= 0) { |
86 | ignore_ppc = 0; | |
87 | return 0; | |
88 | } | |
89 | ||
623b78c3 TR |
90 | if (ignore_ppc) |
91 | return 0; | |
92 | ||
1da177e4 | 93 | if (event != CPUFREQ_INCOMPATIBLE) |
9b67c5d4 TR |
94 | return 0; |
95 | ||
96 | mutex_lock(&performance_mutex); | |
1da177e4 | 97 | |
706546d0 | 98 | pr = per_cpu(processors, policy->cpu); |
1da177e4 LT |
99 | if (!pr || !pr->performance) |
100 | goto out; | |
101 | ||
4be44fcd | 102 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 103 | |
0916bd3e | 104 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
105 | goto out; |
106 | ||
107 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
108 | pr->performance->states[ppc]. |
109 | core_frequency * 1000); | |
1da177e4 | 110 | |
4be44fcd | 111 | out: |
65c19bbd | 112 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
113 | |
114 | return 0; | |
115 | } | |
116 | ||
1da177e4 LT |
117 | static struct notifier_block acpi_ppc_notifier_block = { |
118 | .notifier_call = acpi_processor_ppc_notifier, | |
119 | }; | |
120 | ||
4be44fcd | 121 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 122 | { |
4be44fcd | 123 | acpi_status status = 0; |
27663c58 | 124 | unsigned long long ppc = 0; |
1da177e4 | 125 | |
1da177e4 LT |
126 | |
127 | if (!pr) | |
d550d98d | 128 | return -EINVAL; |
1da177e4 LT |
129 | |
130 | /* | |
131 | * _PPC indicates the maximum state currently supported by the platform | |
132 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
133 | */ | |
134 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
135 | ||
136 | if (status != AE_NOT_FOUND) | |
137 | acpi_processor_ppc_status |= PPC_IN_USE; | |
138 | ||
4be44fcd | 139 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 140 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 141 | return -ENODEV; |
1da177e4 LT |
142 | } |
143 | ||
2d06d8c4 | 144 | pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
919158d1 TR |
145 | (int)ppc, ppc ? "" : "not"); |
146 | ||
4be44fcd | 147 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 148 | |
d550d98d | 149 | return 0; |
1da177e4 LT |
150 | } |
151 | ||
d81c45e1 ZY |
152 | #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
153 | /* | |
154 | * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status | |
155 | * @handle: ACPI processor handle | |
156 | * @status: the status code of _PPC evaluation | |
157 | * 0: success. OSPM is now using the performance state specificed. | |
158 | * 1: failure. OSPM has not changed the number of P-states in use | |
159 | */ | |
160 | static void acpi_processor_ppc_ost(acpi_handle handle, int status) | |
161 | { | |
162 | union acpi_object params[2] = { | |
163 | {.type = ACPI_TYPE_INTEGER,}, | |
164 | {.type = ACPI_TYPE_INTEGER,}, | |
165 | }; | |
166 | struct acpi_object_list arg_list = {2, params}; | |
d81c45e1 | 167 | |
952c63e9 JL |
168 | if (acpi_has_method(handle, "_OST")) { |
169 | params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE; | |
170 | params[1].integer.value = status; | |
171 | acpi_evaluate_object(handle, "_OST", &arg_list, NULL); | |
172 | } | |
d81c45e1 ZY |
173 | } |
174 | ||
175 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) | |
1da177e4 | 176 | { |
623b78c3 TR |
177 | int ret; |
178 | ||
d81c45e1 ZY |
179 | if (ignore_ppc) { |
180 | /* | |
181 | * Only when it is notification event, the _OST object | |
182 | * will be evaluated. Otherwise it is skipped. | |
183 | */ | |
184 | if (event_flag) | |
185 | acpi_processor_ppc_ost(pr->handle, 1); | |
623b78c3 | 186 | return 0; |
d81c45e1 | 187 | } |
623b78c3 TR |
188 | |
189 | ret = acpi_processor_get_platform_limit(pr); | |
d81c45e1 ZY |
190 | /* |
191 | * Only when it is notification event, the _OST object | |
192 | * will be evaluated. Otherwise it is skipped. | |
193 | */ | |
194 | if (event_flag) { | |
195 | if (ret < 0) | |
196 | acpi_processor_ppc_ost(pr->handle, 1); | |
197 | else | |
198 | acpi_processor_ppc_ost(pr->handle, 0); | |
199 | } | |
1da177e4 LT |
200 | if (ret < 0) |
201 | return (ret); | |
202 | else | |
203 | return cpufreq_update_policy(pr->id); | |
204 | } | |
205 | ||
e2f74f35 TR |
206 | int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) |
207 | { | |
208 | struct acpi_processor *pr; | |
209 | ||
210 | pr = per_cpu(processors, cpu); | |
211 | if (!pr || !pr->performance || !pr->performance->state_count) | |
212 | return -ENODEV; | |
213 | *limit = pr->performance->states[pr->performance_platform_limit]. | |
214 | core_frequency * 1000; | |
215 | return 0; | |
216 | } | |
217 | EXPORT_SYMBOL(acpi_processor_get_bios_limit); | |
218 | ||
4be44fcd LB |
219 | void acpi_processor_ppc_init(void) |
220 | { | |
221 | if (!cpufreq_register_notifier | |
222 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
223 | acpi_processor_ppc_status |= PPC_REGISTERED; |
224 | else | |
4be44fcd LB |
225 | printk(KERN_DEBUG |
226 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
227 | } |
228 | ||
4be44fcd LB |
229 | void acpi_processor_ppc_exit(void) |
230 | { | |
1da177e4 | 231 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
232 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
233 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
234 | |
235 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
236 | } | |
237 | ||
9061e0e1 AK |
238 | /* |
239 | * Do a quick check if the systems looks like it should use ACPI | |
240 | * cpufreq. We look at a _PCT method being available, but don't | |
241 | * do a whole lot of sanity checks. | |
242 | */ | |
243 | void acpi_processor_load_module(struct acpi_processor *pr) | |
244 | { | |
245 | static int requested; | |
246 | acpi_status status = 0; | |
247 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
248 | ||
249 | if (!arch_has_acpi_pdc() || requested) | |
250 | return; | |
251 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
252 | if (!ACPI_FAILURE(status)) { | |
253 | printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n"); | |
254 | request_module_nowait("acpi_cpufreq"); | |
255 | requested = 1; | |
256 | } | |
257 | kfree(buffer.pointer); | |
258 | } | |
259 | ||
4be44fcd | 260 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 261 | { |
4be44fcd LB |
262 | int result = 0; |
263 | acpi_status status = 0; | |
264 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
265 | union acpi_object *pct = NULL; | |
266 | union acpi_object obj = { 0 }; | |
1da177e4 | 267 | |
1da177e4 LT |
268 | |
269 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 270 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 271 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 272 | return -ENODEV; |
1da177e4 LT |
273 | } |
274 | ||
4be44fcd | 275 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 276 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 277 | || (pct->package.count != 2)) { |
6468463a | 278 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
279 | result = -EFAULT; |
280 | goto end; | |
281 | } | |
282 | ||
283 | /* | |
284 | * control_register | |
285 | */ | |
286 | ||
287 | obj = pct->package.elements[0]; | |
288 | ||
289 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
290 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
291 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 292 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
293 | result = -EFAULT; |
294 | goto end; | |
295 | } | |
4be44fcd LB |
296 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
297 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
298 | |
299 | /* | |
300 | * status_register | |
301 | */ | |
302 | ||
303 | obj = pct->package.elements[1]; | |
304 | ||
305 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
306 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
307 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 308 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
309 | result = -EFAULT; |
310 | goto end; | |
311 | } | |
312 | ||
4be44fcd LB |
313 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
314 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 315 | |
4be44fcd | 316 | end: |
02438d87 | 317 | kfree(buffer.pointer); |
1da177e4 | 318 | |
d550d98d | 319 | return result; |
1da177e4 LT |
320 | } |
321 | ||
f594065f MG |
322 | #ifdef CONFIG_X86 |
323 | /* | |
324 | * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding | |
325 | * in their ACPI data. Calculate the real values and fix up the _PSS data. | |
326 | */ | |
327 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) | |
328 | { | |
329 | u32 hi, lo, fid, did; | |
330 | int index = px->control & 0x00000007; | |
331 | ||
332 | if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) | |
333 | return; | |
334 | ||
335 | if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) | |
336 | || boot_cpu_data.x86 == 0x11) { | |
337 | rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); | |
9855d8ce SB |
338 | /* |
339 | * MSR C001_0064+: | |
340 | * Bit 63: PstateEn. Read-write. If set, the P-state is valid. | |
341 | */ | |
342 | if (!(hi & BIT(31))) | |
343 | return; | |
344 | ||
f594065f MG |
345 | fid = lo & 0x3f; |
346 | did = (lo >> 6) & 7; | |
347 | if (boot_cpu_data.x86 == 0x10) | |
348 | px->core_frequency = (100 * (fid + 0x10)) >> did; | |
349 | else | |
350 | px->core_frequency = (100 * (fid + 8)) >> did; | |
351 | } | |
352 | } | |
353 | #else | |
354 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; | |
355 | #endif | |
356 | ||
4be44fcd | 357 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 358 | { |
4be44fcd LB |
359 | int result = 0; |
360 | acpi_status status = AE_OK; | |
361 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
362 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
363 | struct acpi_buffer state = { 0, NULL }; | |
364 | union acpi_object *pss = NULL; | |
365 | int i; | |
d8e725f3 | 366 | int last_invalid = -1; |
1da177e4 | 367 | |
1da177e4 LT |
368 | |
369 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 370 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 371 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 372 | return -ENODEV; |
1da177e4 LT |
373 | } |
374 | ||
50dd0969 | 375 | pss = buffer.pointer; |
1da177e4 | 376 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 377 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
378 | result = -EFAULT; |
379 | goto end; | |
380 | } | |
381 | ||
382 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 383 | pss->package.count)); |
1da177e4 LT |
384 | |
385 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
386 | pr->performance->states = |
387 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
388 | GFP_KERNEL); | |
1da177e4 LT |
389 | if (!pr->performance->states) { |
390 | result = -ENOMEM; | |
391 | goto end; | |
392 | } | |
393 | ||
394 | for (i = 0; i < pr->performance->state_count; i++) { | |
395 | ||
396 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
397 | ||
398 | state.length = sizeof(struct acpi_processor_px); | |
399 | state.pointer = px; | |
400 | ||
401 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
402 | ||
403 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 404 | &format, &state); |
1da177e4 | 405 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 406 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
407 | result = -EFAULT; |
408 | kfree(pr->performance->states); | |
409 | goto end; | |
410 | } | |
411 | ||
f594065f MG |
412 | amd_fixup_frequency(px, i); |
413 | ||
1da177e4 | 414 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
415 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
416 | i, | |
417 | (u32) px->core_frequency, | |
418 | (u32) px->power, | |
419 | (u32) px->transition_latency, | |
420 | (u32) px->bus_master_latency, | |
421 | (u32) px->control, (u32) px->status)); | |
1da177e4 | 422 | |
34d531e6 LB |
423 | /* |
424 | * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq | |
425 | */ | |
426 | if (!px->core_frequency || | |
427 | ((u32)(px->core_frequency * 1000) != | |
428 | (px->core_frequency * 1000))) { | |
429 | printk(KERN_ERR FW_BUG PREFIX | |
d8e725f3 MAC |
430 | "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", |
431 | pr->id, px->core_frequency); | |
432 | if (last_invalid == -1) | |
433 | last_invalid = i; | |
434 | } else { | |
435 | if (last_invalid != -1) { | |
436 | /* | |
437 | * Copy this valid entry over last_invalid entry | |
438 | */ | |
439 | memcpy(&(pr->performance->states[last_invalid]), | |
440 | px, sizeof(struct acpi_processor_px)); | |
441 | ++last_invalid; | |
442 | } | |
1da177e4 LT |
443 | } |
444 | } | |
445 | ||
d8e725f3 MAC |
446 | if (last_invalid == 0) { |
447 | printk(KERN_ERR FW_BUG PREFIX | |
448 | "No valid BIOS _PSS frequency found for processor %d\n", pr->id); | |
449 | result = -EFAULT; | |
450 | kfree(pr->performance->states); | |
451 | pr->performance->states = NULL; | |
452 | } | |
453 | ||
454 | if (last_invalid > 0) | |
455 | pr->performance->state_count = last_invalid; | |
456 | ||
4be44fcd | 457 | end: |
02438d87 | 458 | kfree(buffer.pointer); |
1da177e4 | 459 | |
d550d98d | 460 | return result; |
1da177e4 LT |
461 | } |
462 | ||
c705c78c | 463 | int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 464 | { |
4be44fcd | 465 | int result = 0; |
1da177e4 | 466 | |
1da177e4 | 467 | if (!pr || !pr->performance || !pr->handle) |
d550d98d | 468 | return -EINVAL; |
1da177e4 | 469 | |
952c63e9 | 470 | if (!acpi_has_method(pr->handle, "_PCT")) { |
1da177e4 | 471 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd | 472 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 473 | return -ENODEV; |
1da177e4 LT |
474 | } |
475 | ||
476 | result = acpi_processor_get_performance_control(pr); | |
477 | if (result) | |
910dfae2 | 478 | goto update_bios; |
1da177e4 LT |
479 | |
480 | result = acpi_processor_get_performance_states(pr); | |
481 | if (result) | |
910dfae2 | 482 | goto update_bios; |
1da177e4 | 483 | |
455c0d71 DW |
484 | /* We need to call _PPC once when cpufreq starts */ |
485 | if (ignore_ppc != 1) | |
486 | result = acpi_processor_get_platform_limit(pr); | |
487 | ||
488 | return result; | |
910dfae2 TR |
489 | |
490 | /* | |
491 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that | |
492 | * the BIOS is older than the CPU and does not know its frequencies | |
493 | */ | |
494 | update_bios: | |
16be87ea | 495 | #ifdef CONFIG_X86 |
952c63e9 | 496 | if (acpi_has_method(pr->handle, "_PPC")) { |
910dfae2 TR |
497 | if(boot_cpu_has(X86_FEATURE_EST)) |
498 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " | |
499 | "frequency support\n"); | |
500 | } | |
16be87ea | 501 | #endif |
910dfae2 | 502 | return result; |
1da177e4 | 503 | } |
c705c78c | 504 | EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); |
4be44fcd LB |
505 | int acpi_processor_notify_smm(struct module *calling_module) |
506 | { | |
507 | acpi_status status; | |
508 | static int is_done = 0; | |
1da177e4 | 509 | |
1da177e4 LT |
510 | |
511 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 512 | return -EBUSY; |
1da177e4 LT |
513 | |
514 | if (!try_module_get(calling_module)) | |
d550d98d | 515 | return -EINVAL; |
1da177e4 | 516 | |
58f87ed0 LDM |
517 | /* is_done is set to negative if an error occurred, |
518 | * and to postitive if _no_ error occurred, but SMM | |
1da177e4 LT |
519 | * was already notified. This avoids double notification |
520 | * which might lead to unexpected results... | |
521 | */ | |
522 | if (is_done > 0) { | |
523 | module_put(calling_module); | |
d550d98d | 524 | return 0; |
4be44fcd | 525 | } else if (is_done < 0) { |
1da177e4 | 526 | module_put(calling_module); |
d550d98d | 527 | return is_done; |
1da177e4 LT |
528 | } |
529 | ||
530 | is_done = -EIO; | |
531 | ||
ad71860a | 532 | /* Can't write pstate_control to smi_command if either value is zero */ |
cee324b1 | 533 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
ad71860a | 534 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 535 | module_put(calling_module); |
d550d98d | 536 | return 0; |
1da177e4 LT |
537 | } |
538 | ||
4be44fcd | 539 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a | 540 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
cee324b1 | 541 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
1da177e4 | 542 | |
cee324b1 AS |
543 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
544 | (u32) acpi_gbl_FADT.pstate_control, 8); | |
4be44fcd | 545 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 546 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a | 547 | "Failed to write pstate_control [0x%x] to " |
cee324b1 AS |
548 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
549 | acpi_gbl_FADT.smi_command)); | |
1da177e4 | 550 | module_put(calling_module); |
d550d98d | 551 | return status; |
1da177e4 LT |
552 | } |
553 | ||
554 | /* Success. If there's no _PPC, we need to fear nothing, so | |
555 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
556 | is_done = 1; | |
557 | ||
558 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
559 | module_put(calling_module); | |
560 | ||
d550d98d | 561 | return 0; |
1da177e4 | 562 | } |
1da177e4 | 563 | |
4be44fcd | 564 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 | 565 | |
3b2d9942 VP |
566 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
567 | { | |
568 | int result = 0; | |
569 | acpi_status status = AE_OK; | |
570 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
571 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
572 | struct acpi_buffer state = {0, NULL}; | |
573 | union acpi_object *psd = NULL; | |
574 | struct acpi_psd_package *pdomain; | |
575 | ||
3b2d9942 VP |
576 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
577 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 578 | return -ENODEV; |
3b2d9942 VP |
579 | } |
580 | ||
50dd0969 | 581 | psd = buffer.pointer; |
3b2d9942 | 582 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
55ac9a01 | 583 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
584 | result = -EFAULT; |
585 | goto end; | |
586 | } | |
587 | ||
588 | if (psd->package.count != 1) { | |
55ac9a01 | 589 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
590 | result = -EFAULT; |
591 | goto end; | |
592 | } | |
593 | ||
594 | pdomain = &(pr->performance->domain_info); | |
595 | ||
596 | state.length = sizeof(struct acpi_psd_package); | |
597 | state.pointer = pdomain; | |
598 | ||
599 | status = acpi_extract_package(&(psd->package.elements[0]), | |
600 | &format, &state); | |
601 | if (ACPI_FAILURE(status)) { | |
55ac9a01 | 602 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
603 | result = -EFAULT; |
604 | goto end; | |
605 | } | |
606 | ||
607 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
55ac9a01 | 608 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
3b2d9942 VP |
609 | result = -EFAULT; |
610 | goto end; | |
611 | } | |
612 | ||
613 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
55ac9a01 | 614 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
3b2d9942 VP |
615 | result = -EFAULT; |
616 | goto end; | |
617 | } | |
618 | ||
e1eb4779 SG |
619 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
620 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
621 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
622 | printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); | |
623 | result = -EFAULT; | |
624 | goto end; | |
625 | } | |
3b2d9942 | 626 | end: |
02438d87 | 627 | kfree(buffer.pointer); |
9011bff4 | 628 | return result; |
3b2d9942 VP |
629 | } |
630 | ||
631 | int acpi_processor_preregister_performance( | |
a29d8b8e | 632 | struct acpi_processor_performance __percpu *performance) |
3b2d9942 | 633 | { |
09d5ca80 | 634 | int count_target; |
3b2d9942 VP |
635 | int retval = 0; |
636 | unsigned int i, j; | |
2fdf66b4 | 637 | cpumask_var_t covered_cpus; |
3b2d9942 VP |
638 | struct acpi_processor *pr; |
639 | struct acpi_psd_package *pdomain; | |
640 | struct acpi_processor *match_pr; | |
641 | struct acpi_psd_package *match_pdomain; | |
642 | ||
79f55997 | 643 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
644 | return -ENOMEM; |
645 | ||
785fcccd | 646 | mutex_lock(&performance_mutex); |
3b2d9942 | 647 | |
e1eb4779 SG |
648 | /* |
649 | * Check if another driver has already registered, and abort before | |
650 | * changing pr->performance if it has. Check input data as well. | |
651 | */ | |
193de0c7 | 652 | for_each_possible_cpu(i) { |
706546d0 | 653 | pr = per_cpu(processors, i); |
3b2d9942 VP |
654 | if (!pr) { |
655 | /* Look only at processors in ACPI namespace */ | |
656 | continue; | |
657 | } | |
658 | ||
659 | if (pr->performance) { | |
660 | retval = -EBUSY; | |
e1eb4779 | 661 | goto err_out; |
3b2d9942 VP |
662 | } |
663 | ||
b36128c8 | 664 | if (!performance || !per_cpu_ptr(performance, i)) { |
3b2d9942 | 665 | retval = -EINVAL; |
e1eb4779 | 666 | goto err_out; |
3b2d9942 | 667 | } |
e1eb4779 SG |
668 | } |
669 | ||
670 | /* Call _PSD for all CPUs */ | |
671 | for_each_possible_cpu(i) { | |
672 | pr = per_cpu(processors, i); | |
673 | if (!pr) | |
674 | continue; | |
3b2d9942 | 675 | |
b36128c8 | 676 | pr->performance = per_cpu_ptr(performance, i); |
2fdf66b4 | 677 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
3b2d9942 VP |
678 | if (acpi_processor_get_psd(pr)) { |
679 | retval = -EINVAL; | |
680 | continue; | |
681 | } | |
682 | } | |
683 | if (retval) | |
684 | goto err_ret; | |
685 | ||
686 | /* | |
687 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
688 | * domain info. | |
689 | */ | |
193de0c7 | 690 | for_each_possible_cpu(i) { |
706546d0 | 691 | pr = per_cpu(processors, i); |
3b2d9942 VP |
692 | if (!pr) |
693 | continue; | |
694 | ||
2fdf66b4 | 695 | if (cpumask_test_cpu(i, covered_cpus)) |
3b2d9942 VP |
696 | continue; |
697 | ||
698 | pdomain = &(pr->performance->domain_info); | |
2fdf66b4 RR |
699 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
700 | cpumask_set_cpu(i, covered_cpus); | |
3b2d9942 VP |
701 | if (pdomain->num_processors <= 1) |
702 | continue; | |
703 | ||
704 | /* Validate the Domain info */ | |
705 | count_target = pdomain->num_processors; | |
46f18e3a | 706 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 707 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
708 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
709 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
710 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 711 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 712 | |
193de0c7 | 713 | for_each_possible_cpu(j) { |
3b2d9942 VP |
714 | if (i == j) |
715 | continue; | |
716 | ||
706546d0 | 717 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
718 | if (!match_pr) |
719 | continue; | |
720 | ||
721 | match_pdomain = &(match_pr->performance->domain_info); | |
722 | if (match_pdomain->domain != pdomain->domain) | |
723 | continue; | |
724 | ||
725 | /* Here i and j are in the same domain */ | |
726 | ||
727 | if (match_pdomain->num_processors != count_target) { | |
728 | retval = -EINVAL; | |
729 | goto err_ret; | |
730 | } | |
731 | ||
732 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
733 | retval = -EINVAL; | |
734 | goto err_ret; | |
735 | } | |
736 | ||
2fdf66b4 RR |
737 | cpumask_set_cpu(j, covered_cpus); |
738 | cpumask_set_cpu(j, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
739 | } |
740 | ||
193de0c7 | 741 | for_each_possible_cpu(j) { |
3b2d9942 VP |
742 | if (i == j) |
743 | continue; | |
744 | ||
706546d0 | 745 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
746 | if (!match_pr) |
747 | continue; | |
748 | ||
749 | match_pdomain = &(match_pr->performance->domain_info); | |
750 | if (match_pdomain->domain != pdomain->domain) | |
751 | continue; | |
752 | ||
753 | match_pr->performance->shared_type = | |
754 | pr->performance->shared_type; | |
2fdf66b4 RR |
755 | cpumask_copy(match_pr->performance->shared_cpu_map, |
756 | pr->performance->shared_cpu_map); | |
3b2d9942 VP |
757 | } |
758 | } | |
759 | ||
760 | err_ret: | |
193de0c7 | 761 | for_each_possible_cpu(i) { |
706546d0 | 762 | pr = per_cpu(processors, i); |
3b2d9942 VP |
763 | if (!pr || !pr->performance) |
764 | continue; | |
765 | ||
766 | /* Assume no coordination on any error parsing domain info */ | |
767 | if (retval) { | |
2fdf66b4 RR |
768 | cpumask_clear(pr->performance->shared_cpu_map); |
769 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
770 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
771 | } | |
772 | pr->performance = NULL; /* Will be set for real in register */ | |
773 | } | |
774 | ||
e1eb4779 | 775 | err_out: |
785fcccd | 776 | mutex_unlock(&performance_mutex); |
2fdf66b4 | 777 | free_cpumask_var(covered_cpus); |
9011bff4 | 778 | return retval; |
3b2d9942 VP |
779 | } |
780 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
781 | ||
1da177e4 | 782 | int |
4be44fcd LB |
783 | acpi_processor_register_performance(struct acpi_processor_performance |
784 | *performance, unsigned int cpu) | |
1da177e4 LT |
785 | { |
786 | struct acpi_processor *pr; | |
787 | ||
1da177e4 | 788 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
d550d98d | 789 | return -EINVAL; |
1da177e4 | 790 | |
65c19bbd | 791 | mutex_lock(&performance_mutex); |
1da177e4 | 792 | |
706546d0 | 793 | pr = per_cpu(processors, cpu); |
1da177e4 | 794 | if (!pr) { |
65c19bbd | 795 | mutex_unlock(&performance_mutex); |
d550d98d | 796 | return -ENODEV; |
1da177e4 LT |
797 | } |
798 | ||
799 | if (pr->performance) { | |
65c19bbd | 800 | mutex_unlock(&performance_mutex); |
d550d98d | 801 | return -EBUSY; |
1da177e4 LT |
802 | } |
803 | ||
a913f507 AM |
804 | WARN_ON(!performance); |
805 | ||
1da177e4 LT |
806 | pr->performance = performance; |
807 | ||
808 | if (acpi_processor_get_performance_info(pr)) { | |
809 | pr->performance = NULL; | |
65c19bbd | 810 | mutex_unlock(&performance_mutex); |
d550d98d | 811 | return -EIO; |
1da177e4 LT |
812 | } |
813 | ||
65c19bbd | 814 | mutex_unlock(&performance_mutex); |
d550d98d | 815 | return 0; |
1da177e4 | 816 | } |
1da177e4 | 817 | |
4be44fcd | 818 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
819 | |
820 | void | |
4be44fcd LB |
821 | acpi_processor_unregister_performance(struct acpi_processor_performance |
822 | *performance, unsigned int cpu) | |
1da177e4 LT |
823 | { |
824 | struct acpi_processor *pr; | |
825 | ||
65c19bbd | 826 | mutex_lock(&performance_mutex); |
1da177e4 | 827 | |
706546d0 | 828 | pr = per_cpu(processors, cpu); |
1da177e4 | 829 | if (!pr) { |
65c19bbd | 830 | mutex_unlock(&performance_mutex); |
d550d98d | 831 | return; |
1da177e4 LT |
832 | } |
833 | ||
a913f507 AM |
834 | if (pr->performance) |
835 | kfree(pr->performance->states); | |
1da177e4 LT |
836 | pr->performance = NULL; |
837 | ||
65c19bbd | 838 | mutex_unlock(&performance_mutex); |
1da177e4 | 839 | |
d550d98d | 840 | return; |
1da177e4 | 841 | } |
4be44fcd | 842 | |
1da177e4 | 843 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |