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