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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 | * | |
1da177e4 LT |
23 | */ |
24 | ||
1da177e4 LT |
25 | #include <linux/kernel.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/cpufreq.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
8b48463f LZ |
30 | #include <linux/acpi.h> |
31 | #include <acpi/processor.h> | |
16be87ea | 32 | #ifdef CONFIG_X86 |
910dfae2 | 33 | #include <asm/cpufeature.h> |
16be87ea | 34 | #endif |
1da177e4 | 35 | |
a192a958 LB |
36 | #define PREFIX "ACPI: " |
37 | ||
1da177e4 | 38 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 LT |
39 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
40 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
f52fd66d | 41 | ACPI_MODULE_NAME("processor_perflib"); |
1da177e4 | 42 | |
65c19bbd | 43 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 LT |
44 | |
45 | /* | |
46 | * _PPC support is implemented as a CPUfreq policy notifier: | |
47 | * This means each time a CPUfreq driver registered also with | |
48 | * the ACPI core is asked to change the speed policy, the maximum | |
49 | * value is adjusted so that it is within the platform limit. | |
50 | * | |
51 | * Also, when a new platform limit value is detected, the CPUfreq | |
52 | * policy is adjusted accordingly. | |
53 | */ | |
54 | ||
a1531acd TR |
55 | /* ignore_ppc: |
56 | * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet | |
57 | * ignore _PPC | |
58 | * 0 -> cpufreq low level drivers initialized -> consider _PPC values | |
59 | * 1 -> ignore _PPC totally -> forced by user through boot param | |
60 | */ | |
9f497bcc | 61 | static int ignore_ppc = -1; |
613e5f33 | 62 | module_param(ignore_ppc, int, 0644); |
623b78c3 TR |
63 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
64 | "limited by BIOS, this should help"); | |
65 | ||
1da177e4 LT |
66 | #define PPC_REGISTERED 1 |
67 | #define PPC_IN_USE 2 | |
68 | ||
a1531acd | 69 | static int acpi_processor_ppc_status; |
1da177e4 LT |
70 | |
71 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 72 | unsigned long event, void *data) |
1da177e4 LT |
73 | { |
74 | struct cpufreq_policy *policy = data; | |
75 | struct acpi_processor *pr; | |
76 | unsigned int ppc = 0; | |
77 | ||
a1531acd TR |
78 | if (event == CPUFREQ_START && ignore_ppc <= 0) { |
79 | ignore_ppc = 0; | |
80 | return 0; | |
81 | } | |
82 | ||
623b78c3 TR |
83 | if (ignore_ppc) |
84 | return 0; | |
85 | ||
6bfb7c74 | 86 | if (event != CPUFREQ_ADJUST) |
9b67c5d4 TR |
87 | return 0; |
88 | ||
89 | mutex_lock(&performance_mutex); | |
1da177e4 | 90 | |
706546d0 | 91 | pr = per_cpu(processors, policy->cpu); |
1da177e4 LT |
92 | if (!pr || !pr->performance) |
93 | goto out; | |
94 | ||
4be44fcd | 95 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 96 | |
0916bd3e | 97 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
98 | goto out; |
99 | ||
100 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
101 | pr->performance->states[ppc]. |
102 | core_frequency * 1000); | |
1da177e4 | 103 | |
4be44fcd | 104 | out: |
65c19bbd | 105 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
106 | |
107 | return 0; | |
108 | } | |
109 | ||
1da177e4 LT |
110 | static struct notifier_block acpi_ppc_notifier_block = { |
111 | .notifier_call = acpi_processor_ppc_notifier, | |
112 | }; | |
113 | ||
4be44fcd | 114 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 115 | { |
4be44fcd | 116 | acpi_status status = 0; |
27663c58 | 117 | unsigned long long ppc = 0; |
1da177e4 | 118 | |
1da177e4 LT |
119 | |
120 | if (!pr) | |
d550d98d | 121 | return -EINVAL; |
1da177e4 LT |
122 | |
123 | /* | |
124 | * _PPC indicates the maximum state currently supported by the platform | |
125 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
126 | */ | |
127 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
128 | ||
129 | if (status != AE_NOT_FOUND) | |
130 | acpi_processor_ppc_status |= PPC_IN_USE; | |
131 | ||
4be44fcd | 132 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 133 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 134 | return -ENODEV; |
1da177e4 LT |
135 | } |
136 | ||
2d06d8c4 | 137 | pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
919158d1 TR |
138 | (int)ppc, ppc ? "" : "not"); |
139 | ||
4be44fcd | 140 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 141 | |
d550d98d | 142 | return 0; |
1da177e4 LT |
143 | } |
144 | ||
d81c45e1 ZY |
145 | #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
146 | /* | |
147 | * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status | |
148 | * @handle: ACPI processor handle | |
149 | * @status: the status code of _PPC evaluation | |
150 | * 0: success. OSPM is now using the performance state specificed. | |
151 | * 1: failure. OSPM has not changed the number of P-states in use | |
152 | */ | |
153 | static void acpi_processor_ppc_ost(acpi_handle handle, int status) | |
154 | { | |
4a6172a4 JL |
155 | if (acpi_has_method(handle, "_OST")) |
156 | acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE, | |
157 | status, NULL); | |
d81c45e1 ZY |
158 | } |
159 | ||
bca5f557 | 160 | void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) |
1da177e4 | 161 | { |
623b78c3 TR |
162 | int ret; |
163 | ||
d81c45e1 ZY |
164 | if (ignore_ppc) { |
165 | /* | |
166 | * Only when it is notification event, the _OST object | |
167 | * will be evaluated. Otherwise it is skipped. | |
168 | */ | |
169 | if (event_flag) | |
170 | acpi_processor_ppc_ost(pr->handle, 1); | |
bca5f557 | 171 | return; |
d81c45e1 | 172 | } |
623b78c3 TR |
173 | |
174 | ret = acpi_processor_get_platform_limit(pr); | |
d81c45e1 ZY |
175 | /* |
176 | * Only when it is notification event, the _OST object | |
177 | * will be evaluated. Otherwise it is skipped. | |
178 | */ | |
179 | if (event_flag) { | |
180 | if (ret < 0) | |
181 | acpi_processor_ppc_ost(pr->handle, 1); | |
182 | else | |
183 | acpi_processor_ppc_ost(pr->handle, 0); | |
184 | } | |
bca5f557 RW |
185 | if (ret >= 0) |
186 | cpufreq_update_policy(pr->id); | |
1da177e4 LT |
187 | } |
188 | ||
e2f74f35 TR |
189 | int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) |
190 | { | |
191 | struct acpi_processor *pr; | |
192 | ||
193 | pr = per_cpu(processors, cpu); | |
194 | if (!pr || !pr->performance || !pr->performance->state_count) | |
195 | return -ENODEV; | |
196 | *limit = pr->performance->states[pr->performance_platform_limit]. | |
197 | core_frequency * 1000; | |
198 | return 0; | |
199 | } | |
200 | EXPORT_SYMBOL(acpi_processor_get_bios_limit); | |
201 | ||
4be44fcd LB |
202 | void acpi_processor_ppc_init(void) |
203 | { | |
204 | if (!cpufreq_register_notifier | |
205 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
206 | acpi_processor_ppc_status |= PPC_REGISTERED; |
207 | else | |
4be44fcd LB |
208 | printk(KERN_DEBUG |
209 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
210 | } |
211 | ||
4be44fcd LB |
212 | void acpi_processor_ppc_exit(void) |
213 | { | |
1da177e4 | 214 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
215 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
216 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
217 | |
218 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
219 | } | |
220 | ||
4be44fcd | 221 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 222 | { |
4be44fcd LB |
223 | int result = 0; |
224 | acpi_status status = 0; | |
225 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
226 | union acpi_object *pct = NULL; | |
227 | union acpi_object obj = { 0 }; | |
1da177e4 | 228 | |
1da177e4 LT |
229 | |
230 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 231 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 232 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 233 | return -ENODEV; |
1da177e4 LT |
234 | } |
235 | ||
4be44fcd | 236 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 237 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 238 | || (pct->package.count != 2)) { |
6468463a | 239 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
240 | result = -EFAULT; |
241 | goto end; | |
242 | } | |
243 | ||
244 | /* | |
245 | * control_register | |
246 | */ | |
247 | ||
248 | obj = pct->package.elements[0]; | |
249 | ||
250 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
251 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
252 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 253 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
254 | result = -EFAULT; |
255 | goto end; | |
256 | } | |
4be44fcd LB |
257 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
258 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
259 | |
260 | /* | |
261 | * status_register | |
262 | */ | |
263 | ||
264 | obj = pct->package.elements[1]; | |
265 | ||
266 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
267 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
268 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 269 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
270 | result = -EFAULT; |
271 | goto end; | |
272 | } | |
273 | ||
4be44fcd LB |
274 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
275 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 276 | |
4be44fcd | 277 | end: |
02438d87 | 278 | kfree(buffer.pointer); |
1da177e4 | 279 | |
d550d98d | 280 | return result; |
1da177e4 LT |
281 | } |
282 | ||
f594065f MG |
283 | #ifdef CONFIG_X86 |
284 | /* | |
285 | * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding | |
286 | * in their ACPI data. Calculate the real values and fix up the _PSS data. | |
287 | */ | |
288 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) | |
289 | { | |
290 | u32 hi, lo, fid, did; | |
291 | int index = px->control & 0x00000007; | |
292 | ||
293 | if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) | |
294 | return; | |
295 | ||
296 | if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) | |
297 | || boot_cpu_data.x86 == 0x11) { | |
298 | rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); | |
9855d8ce SB |
299 | /* |
300 | * MSR C001_0064+: | |
301 | * Bit 63: PstateEn. Read-write. If set, the P-state is valid. | |
302 | */ | |
303 | if (!(hi & BIT(31))) | |
304 | return; | |
305 | ||
f594065f MG |
306 | fid = lo & 0x3f; |
307 | did = (lo >> 6) & 7; | |
308 | if (boot_cpu_data.x86 == 0x10) | |
309 | px->core_frequency = (100 * (fid + 0x10)) >> did; | |
310 | else | |
311 | px->core_frequency = (100 * (fid + 8)) >> did; | |
312 | } | |
313 | } | |
314 | #else | |
315 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; | |
316 | #endif | |
317 | ||
4be44fcd | 318 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 319 | { |
4be44fcd LB |
320 | int result = 0; |
321 | acpi_status status = AE_OK; | |
322 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
323 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
324 | struct acpi_buffer state = { 0, NULL }; | |
325 | union acpi_object *pss = NULL; | |
326 | int i; | |
d8e725f3 | 327 | int last_invalid = -1; |
1da177e4 | 328 | |
1da177e4 LT |
329 | |
330 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 331 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 332 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 333 | return -ENODEV; |
1da177e4 LT |
334 | } |
335 | ||
50dd0969 | 336 | pss = buffer.pointer; |
1da177e4 | 337 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 338 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
339 | result = -EFAULT; |
340 | goto end; | |
341 | } | |
342 | ||
343 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 344 | pss->package.count)); |
1da177e4 LT |
345 | |
346 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
347 | pr->performance->states = |
348 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
349 | GFP_KERNEL); | |
1da177e4 LT |
350 | if (!pr->performance->states) { |
351 | result = -ENOMEM; | |
352 | goto end; | |
353 | } | |
354 | ||
355 | for (i = 0; i < pr->performance->state_count; i++) { | |
356 | ||
357 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
358 | ||
359 | state.length = sizeof(struct acpi_processor_px); | |
360 | state.pointer = px; | |
361 | ||
362 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
363 | ||
364 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 365 | &format, &state); |
1da177e4 | 366 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 367 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
368 | result = -EFAULT; |
369 | kfree(pr->performance->states); | |
370 | goto end; | |
371 | } | |
372 | ||
f594065f MG |
373 | amd_fixup_frequency(px, i); |
374 | ||
1da177e4 | 375 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
376 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
377 | i, | |
378 | (u32) px->core_frequency, | |
379 | (u32) px->power, | |
380 | (u32) px->transition_latency, | |
381 | (u32) px->bus_master_latency, | |
382 | (u32) px->control, (u32) px->status)); | |
1da177e4 | 383 | |
34d531e6 LB |
384 | /* |
385 | * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq | |
386 | */ | |
387 | if (!px->core_frequency || | |
388 | ((u32)(px->core_frequency * 1000) != | |
389 | (px->core_frequency * 1000))) { | |
390 | printk(KERN_ERR FW_BUG PREFIX | |
d8e725f3 MAC |
391 | "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", |
392 | pr->id, px->core_frequency); | |
393 | if (last_invalid == -1) | |
394 | last_invalid = i; | |
395 | } else { | |
396 | if (last_invalid != -1) { | |
397 | /* | |
398 | * Copy this valid entry over last_invalid entry | |
399 | */ | |
400 | memcpy(&(pr->performance->states[last_invalid]), | |
401 | px, sizeof(struct acpi_processor_px)); | |
402 | ++last_invalid; | |
403 | } | |
1da177e4 LT |
404 | } |
405 | } | |
406 | ||
d8e725f3 MAC |
407 | if (last_invalid == 0) { |
408 | printk(KERN_ERR FW_BUG PREFIX | |
409 | "No valid BIOS _PSS frequency found for processor %d\n", pr->id); | |
410 | result = -EFAULT; | |
411 | kfree(pr->performance->states); | |
412 | pr->performance->states = NULL; | |
413 | } | |
414 | ||
415 | if (last_invalid > 0) | |
416 | pr->performance->state_count = last_invalid; | |
417 | ||
4be44fcd | 418 | end: |
02438d87 | 419 | kfree(buffer.pointer); |
1da177e4 | 420 | |
d550d98d | 421 | return result; |
1da177e4 LT |
422 | } |
423 | ||
c705c78c | 424 | int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 425 | { |
4be44fcd | 426 | int result = 0; |
1da177e4 | 427 | |
1da177e4 | 428 | if (!pr || !pr->performance || !pr->handle) |
d550d98d | 429 | return -EINVAL; |
1da177e4 | 430 | |
952c63e9 | 431 | if (!acpi_has_method(pr->handle, "_PCT")) { |
1da177e4 | 432 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd | 433 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 434 | return -ENODEV; |
1da177e4 LT |
435 | } |
436 | ||
437 | result = acpi_processor_get_performance_control(pr); | |
438 | if (result) | |
910dfae2 | 439 | goto update_bios; |
1da177e4 LT |
440 | |
441 | result = acpi_processor_get_performance_states(pr); | |
442 | if (result) | |
910dfae2 | 443 | goto update_bios; |
1da177e4 | 444 | |
455c0d71 DW |
445 | /* We need to call _PPC once when cpufreq starts */ |
446 | if (ignore_ppc != 1) | |
447 | result = acpi_processor_get_platform_limit(pr); | |
448 | ||
449 | return result; | |
910dfae2 TR |
450 | |
451 | /* | |
452 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that | |
453 | * the BIOS is older than the CPU and does not know its frequencies | |
454 | */ | |
455 | update_bios: | |
16be87ea | 456 | #ifdef CONFIG_X86 |
952c63e9 | 457 | if (acpi_has_method(pr->handle, "_PPC")) { |
910dfae2 TR |
458 | if(boot_cpu_has(X86_FEATURE_EST)) |
459 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " | |
460 | "frequency support\n"); | |
461 | } | |
16be87ea | 462 | #endif |
910dfae2 | 463 | return result; |
1da177e4 | 464 | } |
c705c78c | 465 | EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); |
d0ea59e1 RW |
466 | |
467 | int acpi_processor_pstate_control(void) | |
4be44fcd LB |
468 | { |
469 | acpi_status status; | |
1da177e4 | 470 | |
d0ea59e1 RW |
471 | if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control) |
472 | return 0; | |
473 | ||
474 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
475 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", | |
476 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); | |
477 | ||
478 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, | |
479 | (u32)acpi_gbl_FADT.pstate_control, 8); | |
480 | if (ACPI_SUCCESS(status)) | |
481 | return 1; | |
482 | ||
483 | ACPI_EXCEPTION((AE_INFO, status, | |
484 | "Failed to write pstate_control [0x%x] to smi_command [0x%x]", | |
485 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); | |
486 | return -EIO; | |
487 | } | |
488 | ||
489 | int acpi_processor_notify_smm(struct module *calling_module) | |
490 | { | |
491 | static int is_done = 0; | |
492 | int result; | |
1da177e4 LT |
493 | |
494 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 495 | return -EBUSY; |
1da177e4 LT |
496 | |
497 | if (!try_module_get(calling_module)) | |
d550d98d | 498 | return -EINVAL; |
1da177e4 | 499 | |
58f87ed0 LDM |
500 | /* is_done is set to negative if an error occurred, |
501 | * and to postitive if _no_ error occurred, but SMM | |
1da177e4 LT |
502 | * was already notified. This avoids double notification |
503 | * which might lead to unexpected results... | |
504 | */ | |
505 | if (is_done > 0) { | |
506 | module_put(calling_module); | |
d550d98d | 507 | return 0; |
4be44fcd | 508 | } else if (is_done < 0) { |
1da177e4 | 509 | module_put(calling_module); |
d550d98d | 510 | return is_done; |
1da177e4 LT |
511 | } |
512 | ||
513 | is_done = -EIO; | |
514 | ||
d0ea59e1 RW |
515 | result = acpi_processor_pstate_control(); |
516 | if (!result) { | |
ad71860a | 517 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 518 | module_put(calling_module); |
d550d98d | 519 | return 0; |
1da177e4 | 520 | } |
d0ea59e1 | 521 | if (result < 0) { |
1da177e4 | 522 | module_put(calling_module); |
d0ea59e1 | 523 | return result; |
1da177e4 LT |
524 | } |
525 | ||
526 | /* Success. If there's no _PPC, we need to fear nothing, so | |
527 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
528 | is_done = 1; | |
529 | ||
530 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
531 | module_put(calling_module); | |
532 | ||
d550d98d | 533 | return 0; |
1da177e4 | 534 | } |
1da177e4 | 535 | |
4be44fcd | 536 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 | 537 | |
3b2d9942 VP |
538 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
539 | { | |
540 | int result = 0; | |
541 | acpi_status status = AE_OK; | |
542 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
543 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
544 | struct acpi_buffer state = {0, NULL}; | |
545 | union acpi_object *psd = NULL; | |
546 | struct acpi_psd_package *pdomain; | |
547 | ||
3b2d9942 VP |
548 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
549 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 550 | return -ENODEV; |
3b2d9942 VP |
551 | } |
552 | ||
50dd0969 | 553 | psd = buffer.pointer; |
3b2d9942 | 554 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
55ac9a01 | 555 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
556 | result = -EFAULT; |
557 | goto end; | |
558 | } | |
559 | ||
560 | if (psd->package.count != 1) { | |
55ac9a01 | 561 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
562 | result = -EFAULT; |
563 | goto end; | |
564 | } | |
565 | ||
566 | pdomain = &(pr->performance->domain_info); | |
567 | ||
568 | state.length = sizeof(struct acpi_psd_package); | |
569 | state.pointer = pdomain; | |
570 | ||
571 | status = acpi_extract_package(&(psd->package.elements[0]), | |
572 | &format, &state); | |
573 | if (ACPI_FAILURE(status)) { | |
55ac9a01 | 574 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
575 | result = -EFAULT; |
576 | goto end; | |
577 | } | |
578 | ||
579 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
55ac9a01 | 580 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
3b2d9942 VP |
581 | result = -EFAULT; |
582 | goto end; | |
583 | } | |
584 | ||
585 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
55ac9a01 | 586 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
3b2d9942 VP |
587 | result = -EFAULT; |
588 | goto end; | |
589 | } | |
590 | ||
e1eb4779 SG |
591 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
592 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
593 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
594 | printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); | |
595 | result = -EFAULT; | |
596 | goto end; | |
597 | } | |
3b2d9942 | 598 | end: |
02438d87 | 599 | kfree(buffer.pointer); |
9011bff4 | 600 | return result; |
3b2d9942 VP |
601 | } |
602 | ||
603 | int acpi_processor_preregister_performance( | |
a29d8b8e | 604 | struct acpi_processor_performance __percpu *performance) |
3b2d9942 | 605 | { |
09d5ca80 | 606 | int count_target; |
3b2d9942 VP |
607 | int retval = 0; |
608 | unsigned int i, j; | |
2fdf66b4 | 609 | cpumask_var_t covered_cpus; |
3b2d9942 VP |
610 | struct acpi_processor *pr; |
611 | struct acpi_psd_package *pdomain; | |
612 | struct acpi_processor *match_pr; | |
613 | struct acpi_psd_package *match_pdomain; | |
614 | ||
79f55997 | 615 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
616 | return -ENOMEM; |
617 | ||
785fcccd | 618 | mutex_lock(&performance_mutex); |
3b2d9942 | 619 | |
e1eb4779 SG |
620 | /* |
621 | * Check if another driver has already registered, and abort before | |
622 | * changing pr->performance if it has. Check input data as well. | |
623 | */ | |
193de0c7 | 624 | for_each_possible_cpu(i) { |
706546d0 | 625 | pr = per_cpu(processors, i); |
3b2d9942 VP |
626 | if (!pr) { |
627 | /* Look only at processors in ACPI namespace */ | |
628 | continue; | |
629 | } | |
630 | ||
631 | if (pr->performance) { | |
632 | retval = -EBUSY; | |
e1eb4779 | 633 | goto err_out; |
3b2d9942 VP |
634 | } |
635 | ||
b36128c8 | 636 | if (!performance || !per_cpu_ptr(performance, i)) { |
3b2d9942 | 637 | retval = -EINVAL; |
e1eb4779 | 638 | goto err_out; |
3b2d9942 | 639 | } |
e1eb4779 SG |
640 | } |
641 | ||
642 | /* Call _PSD for all CPUs */ | |
643 | for_each_possible_cpu(i) { | |
644 | pr = per_cpu(processors, i); | |
645 | if (!pr) | |
646 | continue; | |
3b2d9942 | 647 | |
b36128c8 | 648 | pr->performance = per_cpu_ptr(performance, i); |
2fdf66b4 | 649 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
3b2d9942 VP |
650 | if (acpi_processor_get_psd(pr)) { |
651 | retval = -EINVAL; | |
652 | continue; | |
653 | } | |
654 | } | |
655 | if (retval) | |
656 | goto err_ret; | |
657 | ||
658 | /* | |
659 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
660 | * domain info. | |
661 | */ | |
193de0c7 | 662 | for_each_possible_cpu(i) { |
706546d0 | 663 | pr = per_cpu(processors, i); |
3b2d9942 VP |
664 | if (!pr) |
665 | continue; | |
666 | ||
2fdf66b4 | 667 | if (cpumask_test_cpu(i, covered_cpus)) |
3b2d9942 VP |
668 | continue; |
669 | ||
670 | pdomain = &(pr->performance->domain_info); | |
2fdf66b4 RR |
671 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
672 | cpumask_set_cpu(i, covered_cpus); | |
3b2d9942 VP |
673 | if (pdomain->num_processors <= 1) |
674 | continue; | |
675 | ||
676 | /* Validate the Domain info */ | |
677 | count_target = pdomain->num_processors; | |
46f18e3a | 678 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 679 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
680 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
681 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
682 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 683 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 684 | |
193de0c7 | 685 | for_each_possible_cpu(j) { |
3b2d9942 VP |
686 | if (i == j) |
687 | continue; | |
688 | ||
706546d0 | 689 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
690 | if (!match_pr) |
691 | continue; | |
692 | ||
693 | match_pdomain = &(match_pr->performance->domain_info); | |
694 | if (match_pdomain->domain != pdomain->domain) | |
695 | continue; | |
696 | ||
697 | /* Here i and j are in the same domain */ | |
698 | ||
699 | if (match_pdomain->num_processors != count_target) { | |
700 | retval = -EINVAL; | |
701 | goto err_ret; | |
702 | } | |
703 | ||
704 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
705 | retval = -EINVAL; | |
706 | goto err_ret; | |
707 | } | |
708 | ||
2fdf66b4 RR |
709 | cpumask_set_cpu(j, covered_cpus); |
710 | cpumask_set_cpu(j, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
711 | } |
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 | match_pr->performance->shared_type = | |
726 | pr->performance->shared_type; | |
2fdf66b4 RR |
727 | cpumask_copy(match_pr->performance->shared_cpu_map, |
728 | pr->performance->shared_cpu_map); | |
3b2d9942 VP |
729 | } |
730 | } | |
731 | ||
732 | err_ret: | |
193de0c7 | 733 | for_each_possible_cpu(i) { |
706546d0 | 734 | pr = per_cpu(processors, i); |
3b2d9942 VP |
735 | if (!pr || !pr->performance) |
736 | continue; | |
737 | ||
738 | /* Assume no coordination on any error parsing domain info */ | |
739 | if (retval) { | |
2fdf66b4 RR |
740 | cpumask_clear(pr->performance->shared_cpu_map); |
741 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
742 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
743 | } | |
744 | pr->performance = NULL; /* Will be set for real in register */ | |
745 | } | |
746 | ||
e1eb4779 | 747 | err_out: |
785fcccd | 748 | mutex_unlock(&performance_mutex); |
2fdf66b4 | 749 | free_cpumask_var(covered_cpus); |
9011bff4 | 750 | return retval; |
3b2d9942 VP |
751 | } |
752 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
753 | ||
1da177e4 | 754 | int |
4be44fcd LB |
755 | acpi_processor_register_performance(struct acpi_processor_performance |
756 | *performance, unsigned int cpu) | |
1da177e4 LT |
757 | { |
758 | struct acpi_processor *pr; | |
759 | ||
1da177e4 | 760 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
d550d98d | 761 | return -EINVAL; |
1da177e4 | 762 | |
65c19bbd | 763 | mutex_lock(&performance_mutex); |
1da177e4 | 764 | |
706546d0 | 765 | pr = per_cpu(processors, cpu); |
1da177e4 | 766 | if (!pr) { |
65c19bbd | 767 | mutex_unlock(&performance_mutex); |
d550d98d | 768 | return -ENODEV; |
1da177e4 LT |
769 | } |
770 | ||
771 | if (pr->performance) { | |
65c19bbd | 772 | mutex_unlock(&performance_mutex); |
d550d98d | 773 | return -EBUSY; |
1da177e4 LT |
774 | } |
775 | ||
a913f507 AM |
776 | WARN_ON(!performance); |
777 | ||
1da177e4 LT |
778 | pr->performance = performance; |
779 | ||
780 | if (acpi_processor_get_performance_info(pr)) { | |
781 | pr->performance = NULL; | |
65c19bbd | 782 | mutex_unlock(&performance_mutex); |
d550d98d | 783 | return -EIO; |
1da177e4 LT |
784 | } |
785 | ||
65c19bbd | 786 | mutex_unlock(&performance_mutex); |
d550d98d | 787 | return 0; |
1da177e4 | 788 | } |
1da177e4 | 789 | |
4be44fcd | 790 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 | 791 | |
b2f8dc4c | 792 | void acpi_processor_unregister_performance(unsigned int cpu) |
1da177e4 LT |
793 | { |
794 | struct acpi_processor *pr; | |
795 | ||
65c19bbd | 796 | mutex_lock(&performance_mutex); |
1da177e4 | 797 | |
706546d0 | 798 | pr = per_cpu(processors, cpu); |
1da177e4 | 799 | if (!pr) { |
65c19bbd | 800 | mutex_unlock(&performance_mutex); |
d550d98d | 801 | return; |
1da177e4 LT |
802 | } |
803 | ||
a913f507 AM |
804 | if (pr->performance) |
805 | kfree(pr->performance->states); | |
1da177e4 LT |
806 | pr->performance = NULL; |
807 | ||
65c19bbd | 808 | mutex_unlock(&performance_mutex); |
1da177e4 | 809 | |
d550d98d | 810 | return; |
1da177e4 | 811 | } |
4be44fcd | 812 | |
1da177e4 | 813 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |