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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 | ||
4be44fcd | 238 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 239 | { |
4be44fcd LB |
240 | int result = 0; |
241 | acpi_status status = 0; | |
242 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
243 | union acpi_object *pct = NULL; | |
244 | union acpi_object obj = { 0 }; | |
1da177e4 | 245 | |
1da177e4 LT |
246 | |
247 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 248 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 249 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 250 | return -ENODEV; |
1da177e4 LT |
251 | } |
252 | ||
4be44fcd | 253 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 254 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 255 | || (pct->package.count != 2)) { |
6468463a | 256 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
257 | result = -EFAULT; |
258 | goto end; | |
259 | } | |
260 | ||
261 | /* | |
262 | * control_register | |
263 | */ | |
264 | ||
265 | obj = pct->package.elements[0]; | |
266 | ||
267 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
268 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
269 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 270 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
271 | result = -EFAULT; |
272 | goto end; | |
273 | } | |
4be44fcd LB |
274 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
275 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
276 | |
277 | /* | |
278 | * status_register | |
279 | */ | |
280 | ||
281 | obj = pct->package.elements[1]; | |
282 | ||
283 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
284 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
285 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 286 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
287 | result = -EFAULT; |
288 | goto end; | |
289 | } | |
290 | ||
4be44fcd LB |
291 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
292 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 293 | |
4be44fcd | 294 | end: |
02438d87 | 295 | kfree(buffer.pointer); |
1da177e4 | 296 | |
d550d98d | 297 | return result; |
1da177e4 LT |
298 | } |
299 | ||
f594065f MG |
300 | #ifdef CONFIG_X86 |
301 | /* | |
302 | * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding | |
303 | * in their ACPI data. Calculate the real values and fix up the _PSS data. | |
304 | */ | |
305 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) | |
306 | { | |
307 | u32 hi, lo, fid, did; | |
308 | int index = px->control & 0x00000007; | |
309 | ||
310 | if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) | |
311 | return; | |
312 | ||
313 | if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) | |
314 | || boot_cpu_data.x86 == 0x11) { | |
315 | rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); | |
9855d8ce SB |
316 | /* |
317 | * MSR C001_0064+: | |
318 | * Bit 63: PstateEn. Read-write. If set, the P-state is valid. | |
319 | */ | |
320 | if (!(hi & BIT(31))) | |
321 | return; | |
322 | ||
f594065f MG |
323 | fid = lo & 0x3f; |
324 | did = (lo >> 6) & 7; | |
325 | if (boot_cpu_data.x86 == 0x10) | |
326 | px->core_frequency = (100 * (fid + 0x10)) >> did; | |
327 | else | |
328 | px->core_frequency = (100 * (fid + 8)) >> did; | |
329 | } | |
330 | } | |
331 | #else | |
332 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; | |
333 | #endif | |
334 | ||
4be44fcd | 335 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 336 | { |
4be44fcd LB |
337 | int result = 0; |
338 | acpi_status status = AE_OK; | |
339 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
340 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
341 | struct acpi_buffer state = { 0, NULL }; | |
342 | union acpi_object *pss = NULL; | |
343 | int i; | |
d8e725f3 | 344 | int last_invalid = -1; |
1da177e4 | 345 | |
1da177e4 LT |
346 | |
347 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 348 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 349 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 350 | return -ENODEV; |
1da177e4 LT |
351 | } |
352 | ||
50dd0969 | 353 | pss = buffer.pointer; |
1da177e4 | 354 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 355 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
356 | result = -EFAULT; |
357 | goto end; | |
358 | } | |
359 | ||
360 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 361 | pss->package.count)); |
1da177e4 LT |
362 | |
363 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
364 | pr->performance->states = |
365 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
366 | GFP_KERNEL); | |
1da177e4 LT |
367 | if (!pr->performance->states) { |
368 | result = -ENOMEM; | |
369 | goto end; | |
370 | } | |
371 | ||
372 | for (i = 0; i < pr->performance->state_count; i++) { | |
373 | ||
374 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
375 | ||
376 | state.length = sizeof(struct acpi_processor_px); | |
377 | state.pointer = px; | |
378 | ||
379 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
380 | ||
381 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 382 | &format, &state); |
1da177e4 | 383 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 384 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
385 | result = -EFAULT; |
386 | kfree(pr->performance->states); | |
387 | goto end; | |
388 | } | |
389 | ||
f594065f MG |
390 | amd_fixup_frequency(px, i); |
391 | ||
1da177e4 | 392 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
393 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
394 | i, | |
395 | (u32) px->core_frequency, | |
396 | (u32) px->power, | |
397 | (u32) px->transition_latency, | |
398 | (u32) px->bus_master_latency, | |
399 | (u32) px->control, (u32) px->status)); | |
1da177e4 | 400 | |
34d531e6 LB |
401 | /* |
402 | * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq | |
403 | */ | |
404 | if (!px->core_frequency || | |
405 | ((u32)(px->core_frequency * 1000) != | |
406 | (px->core_frequency * 1000))) { | |
407 | printk(KERN_ERR FW_BUG PREFIX | |
d8e725f3 MAC |
408 | "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", |
409 | pr->id, px->core_frequency); | |
410 | if (last_invalid == -1) | |
411 | last_invalid = i; | |
412 | } else { | |
413 | if (last_invalid != -1) { | |
414 | /* | |
415 | * Copy this valid entry over last_invalid entry | |
416 | */ | |
417 | memcpy(&(pr->performance->states[last_invalid]), | |
418 | px, sizeof(struct acpi_processor_px)); | |
419 | ++last_invalid; | |
420 | } | |
1da177e4 LT |
421 | } |
422 | } | |
423 | ||
d8e725f3 MAC |
424 | if (last_invalid == 0) { |
425 | printk(KERN_ERR FW_BUG PREFIX | |
426 | "No valid BIOS _PSS frequency found for processor %d\n", pr->id); | |
427 | result = -EFAULT; | |
428 | kfree(pr->performance->states); | |
429 | pr->performance->states = NULL; | |
430 | } | |
431 | ||
432 | if (last_invalid > 0) | |
433 | pr->performance->state_count = last_invalid; | |
434 | ||
4be44fcd | 435 | end: |
02438d87 | 436 | kfree(buffer.pointer); |
1da177e4 | 437 | |
d550d98d | 438 | return result; |
1da177e4 LT |
439 | } |
440 | ||
c705c78c | 441 | int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 442 | { |
4be44fcd | 443 | int result = 0; |
1da177e4 | 444 | |
1da177e4 | 445 | if (!pr || !pr->performance || !pr->handle) |
d550d98d | 446 | return -EINVAL; |
1da177e4 | 447 | |
952c63e9 | 448 | if (!acpi_has_method(pr->handle, "_PCT")) { |
1da177e4 | 449 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd | 450 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 451 | return -ENODEV; |
1da177e4 LT |
452 | } |
453 | ||
454 | result = acpi_processor_get_performance_control(pr); | |
455 | if (result) | |
910dfae2 | 456 | goto update_bios; |
1da177e4 LT |
457 | |
458 | result = acpi_processor_get_performance_states(pr); | |
459 | if (result) | |
910dfae2 | 460 | goto update_bios; |
1da177e4 | 461 | |
455c0d71 DW |
462 | /* We need to call _PPC once when cpufreq starts */ |
463 | if (ignore_ppc != 1) | |
464 | result = acpi_processor_get_platform_limit(pr); | |
465 | ||
466 | return result; | |
910dfae2 TR |
467 | |
468 | /* | |
469 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that | |
470 | * the BIOS is older than the CPU and does not know its frequencies | |
471 | */ | |
472 | update_bios: | |
16be87ea | 473 | #ifdef CONFIG_X86 |
952c63e9 | 474 | if (acpi_has_method(pr->handle, "_PPC")) { |
910dfae2 TR |
475 | if(boot_cpu_has(X86_FEATURE_EST)) |
476 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " | |
477 | "frequency support\n"); | |
478 | } | |
16be87ea | 479 | #endif |
910dfae2 | 480 | return result; |
1da177e4 | 481 | } |
c705c78c | 482 | EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); |
4be44fcd LB |
483 | int acpi_processor_notify_smm(struct module *calling_module) |
484 | { | |
485 | acpi_status status; | |
486 | static int is_done = 0; | |
1da177e4 | 487 | |
1da177e4 LT |
488 | |
489 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 490 | return -EBUSY; |
1da177e4 LT |
491 | |
492 | if (!try_module_get(calling_module)) | |
d550d98d | 493 | return -EINVAL; |
1da177e4 | 494 | |
58f87ed0 LDM |
495 | /* is_done is set to negative if an error occurred, |
496 | * and to postitive if _no_ error occurred, but SMM | |
1da177e4 LT |
497 | * was already notified. This avoids double notification |
498 | * which might lead to unexpected results... | |
499 | */ | |
500 | if (is_done > 0) { | |
501 | module_put(calling_module); | |
d550d98d | 502 | return 0; |
4be44fcd | 503 | } else if (is_done < 0) { |
1da177e4 | 504 | module_put(calling_module); |
d550d98d | 505 | return is_done; |
1da177e4 LT |
506 | } |
507 | ||
508 | is_done = -EIO; | |
509 | ||
ad71860a | 510 | /* Can't write pstate_control to smi_command if either value is zero */ |
cee324b1 | 511 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
ad71860a | 512 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 513 | module_put(calling_module); |
d550d98d | 514 | return 0; |
1da177e4 LT |
515 | } |
516 | ||
4be44fcd | 517 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a | 518 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
cee324b1 | 519 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
1da177e4 | 520 | |
cee324b1 AS |
521 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
522 | (u32) acpi_gbl_FADT.pstate_control, 8); | |
4be44fcd | 523 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 524 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a | 525 | "Failed to write pstate_control [0x%x] to " |
cee324b1 AS |
526 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
527 | acpi_gbl_FADT.smi_command)); | |
1da177e4 | 528 | module_put(calling_module); |
d550d98d | 529 | return status; |
1da177e4 LT |
530 | } |
531 | ||
532 | /* Success. If there's no _PPC, we need to fear nothing, so | |
533 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
534 | is_done = 1; | |
535 | ||
536 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
537 | module_put(calling_module); | |
538 | ||
d550d98d | 539 | return 0; |
1da177e4 | 540 | } |
1da177e4 | 541 | |
4be44fcd | 542 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 | 543 | |
3b2d9942 VP |
544 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
545 | { | |
546 | int result = 0; | |
547 | acpi_status status = AE_OK; | |
548 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
549 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
550 | struct acpi_buffer state = {0, NULL}; | |
551 | union acpi_object *psd = NULL; | |
552 | struct acpi_psd_package *pdomain; | |
553 | ||
3b2d9942 VP |
554 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
555 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 556 | return -ENODEV; |
3b2d9942 VP |
557 | } |
558 | ||
50dd0969 | 559 | psd = buffer.pointer; |
3b2d9942 | 560 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
55ac9a01 | 561 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
562 | result = -EFAULT; |
563 | goto end; | |
564 | } | |
565 | ||
566 | if (psd->package.count != 1) { | |
55ac9a01 | 567 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
568 | result = -EFAULT; |
569 | goto end; | |
570 | } | |
571 | ||
572 | pdomain = &(pr->performance->domain_info); | |
573 | ||
574 | state.length = sizeof(struct acpi_psd_package); | |
575 | state.pointer = pdomain; | |
576 | ||
577 | status = acpi_extract_package(&(psd->package.elements[0]), | |
578 | &format, &state); | |
579 | if (ACPI_FAILURE(status)) { | |
55ac9a01 | 580 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
581 | result = -EFAULT; |
582 | goto end; | |
583 | } | |
584 | ||
585 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
55ac9a01 | 586 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
3b2d9942 VP |
587 | result = -EFAULT; |
588 | goto end; | |
589 | } | |
590 | ||
591 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
55ac9a01 | 592 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
3b2d9942 VP |
593 | result = -EFAULT; |
594 | goto end; | |
595 | } | |
596 | ||
e1eb4779 SG |
597 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
598 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
599 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
600 | printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); | |
601 | result = -EFAULT; | |
602 | goto end; | |
603 | } | |
3b2d9942 | 604 | end: |
02438d87 | 605 | kfree(buffer.pointer); |
9011bff4 | 606 | return result; |
3b2d9942 VP |
607 | } |
608 | ||
609 | int acpi_processor_preregister_performance( | |
a29d8b8e | 610 | struct acpi_processor_performance __percpu *performance) |
3b2d9942 | 611 | { |
09d5ca80 | 612 | int count_target; |
3b2d9942 VP |
613 | int retval = 0; |
614 | unsigned int i, j; | |
2fdf66b4 | 615 | cpumask_var_t covered_cpus; |
3b2d9942 VP |
616 | struct acpi_processor *pr; |
617 | struct acpi_psd_package *pdomain; | |
618 | struct acpi_processor *match_pr; | |
619 | struct acpi_psd_package *match_pdomain; | |
620 | ||
79f55997 | 621 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
622 | return -ENOMEM; |
623 | ||
785fcccd | 624 | mutex_lock(&performance_mutex); |
3b2d9942 | 625 | |
e1eb4779 SG |
626 | /* |
627 | * Check if another driver has already registered, and abort before | |
628 | * changing pr->performance if it has. Check input data as well. | |
629 | */ | |
193de0c7 | 630 | for_each_possible_cpu(i) { |
706546d0 | 631 | pr = per_cpu(processors, i); |
3b2d9942 VP |
632 | if (!pr) { |
633 | /* Look only at processors in ACPI namespace */ | |
634 | continue; | |
635 | } | |
636 | ||
637 | if (pr->performance) { | |
638 | retval = -EBUSY; | |
e1eb4779 | 639 | goto err_out; |
3b2d9942 VP |
640 | } |
641 | ||
b36128c8 | 642 | if (!performance || !per_cpu_ptr(performance, i)) { |
3b2d9942 | 643 | retval = -EINVAL; |
e1eb4779 | 644 | goto err_out; |
3b2d9942 | 645 | } |
e1eb4779 SG |
646 | } |
647 | ||
648 | /* Call _PSD for all CPUs */ | |
649 | for_each_possible_cpu(i) { | |
650 | pr = per_cpu(processors, i); | |
651 | if (!pr) | |
652 | continue; | |
3b2d9942 | 653 | |
b36128c8 | 654 | pr->performance = per_cpu_ptr(performance, i); |
2fdf66b4 | 655 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
3b2d9942 VP |
656 | if (acpi_processor_get_psd(pr)) { |
657 | retval = -EINVAL; | |
658 | continue; | |
659 | } | |
660 | } | |
661 | if (retval) | |
662 | goto err_ret; | |
663 | ||
664 | /* | |
665 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
666 | * domain info. | |
667 | */ | |
193de0c7 | 668 | for_each_possible_cpu(i) { |
706546d0 | 669 | pr = per_cpu(processors, i); |
3b2d9942 VP |
670 | if (!pr) |
671 | continue; | |
672 | ||
2fdf66b4 | 673 | if (cpumask_test_cpu(i, covered_cpus)) |
3b2d9942 VP |
674 | continue; |
675 | ||
676 | pdomain = &(pr->performance->domain_info); | |
2fdf66b4 RR |
677 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
678 | cpumask_set_cpu(i, covered_cpus); | |
3b2d9942 VP |
679 | if (pdomain->num_processors <= 1) |
680 | continue; | |
681 | ||
682 | /* Validate the Domain info */ | |
683 | count_target = pdomain->num_processors; | |
46f18e3a | 684 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 685 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
686 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
687 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
688 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 689 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 690 | |
193de0c7 | 691 | for_each_possible_cpu(j) { |
3b2d9942 VP |
692 | if (i == j) |
693 | continue; | |
694 | ||
706546d0 | 695 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
696 | if (!match_pr) |
697 | continue; | |
698 | ||
699 | match_pdomain = &(match_pr->performance->domain_info); | |
700 | if (match_pdomain->domain != pdomain->domain) | |
701 | continue; | |
702 | ||
703 | /* Here i and j are in the same domain */ | |
704 | ||
705 | if (match_pdomain->num_processors != count_target) { | |
706 | retval = -EINVAL; | |
707 | goto err_ret; | |
708 | } | |
709 | ||
710 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
711 | retval = -EINVAL; | |
712 | goto err_ret; | |
713 | } | |
714 | ||
2fdf66b4 RR |
715 | cpumask_set_cpu(j, covered_cpus); |
716 | cpumask_set_cpu(j, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
717 | } |
718 | ||
193de0c7 | 719 | for_each_possible_cpu(j) { |
3b2d9942 VP |
720 | if (i == j) |
721 | continue; | |
722 | ||
706546d0 | 723 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
724 | if (!match_pr) |
725 | continue; | |
726 | ||
727 | match_pdomain = &(match_pr->performance->domain_info); | |
728 | if (match_pdomain->domain != pdomain->domain) | |
729 | continue; | |
730 | ||
731 | match_pr->performance->shared_type = | |
732 | pr->performance->shared_type; | |
2fdf66b4 RR |
733 | cpumask_copy(match_pr->performance->shared_cpu_map, |
734 | pr->performance->shared_cpu_map); | |
3b2d9942 VP |
735 | } |
736 | } | |
737 | ||
738 | err_ret: | |
193de0c7 | 739 | for_each_possible_cpu(i) { |
706546d0 | 740 | pr = per_cpu(processors, i); |
3b2d9942 VP |
741 | if (!pr || !pr->performance) |
742 | continue; | |
743 | ||
744 | /* Assume no coordination on any error parsing domain info */ | |
745 | if (retval) { | |
2fdf66b4 RR |
746 | cpumask_clear(pr->performance->shared_cpu_map); |
747 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
748 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
749 | } | |
750 | pr->performance = NULL; /* Will be set for real in register */ | |
751 | } | |
752 | ||
e1eb4779 | 753 | err_out: |
785fcccd | 754 | mutex_unlock(&performance_mutex); |
2fdf66b4 | 755 | free_cpumask_var(covered_cpus); |
9011bff4 | 756 | return retval; |
3b2d9942 VP |
757 | } |
758 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
759 | ||
1da177e4 | 760 | int |
4be44fcd LB |
761 | acpi_processor_register_performance(struct acpi_processor_performance |
762 | *performance, unsigned int cpu) | |
1da177e4 LT |
763 | { |
764 | struct acpi_processor *pr; | |
765 | ||
1da177e4 | 766 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
d550d98d | 767 | return -EINVAL; |
1da177e4 | 768 | |
65c19bbd | 769 | mutex_lock(&performance_mutex); |
1da177e4 | 770 | |
706546d0 | 771 | pr = per_cpu(processors, cpu); |
1da177e4 | 772 | if (!pr) { |
65c19bbd | 773 | mutex_unlock(&performance_mutex); |
d550d98d | 774 | return -ENODEV; |
1da177e4 LT |
775 | } |
776 | ||
777 | if (pr->performance) { | |
65c19bbd | 778 | mutex_unlock(&performance_mutex); |
d550d98d | 779 | return -EBUSY; |
1da177e4 LT |
780 | } |
781 | ||
a913f507 AM |
782 | WARN_ON(!performance); |
783 | ||
1da177e4 LT |
784 | pr->performance = performance; |
785 | ||
786 | if (acpi_processor_get_performance_info(pr)) { | |
787 | pr->performance = NULL; | |
65c19bbd | 788 | mutex_unlock(&performance_mutex); |
d550d98d | 789 | return -EIO; |
1da177e4 LT |
790 | } |
791 | ||
65c19bbd | 792 | mutex_unlock(&performance_mutex); |
d550d98d | 793 | return 0; |
1da177e4 | 794 | } |
1da177e4 | 795 | |
4be44fcd | 796 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
797 | |
798 | void | |
4be44fcd LB |
799 | acpi_processor_unregister_performance(struct acpi_processor_performance |
800 | *performance, unsigned int cpu) | |
1da177e4 LT |
801 | { |
802 | struct acpi_processor *pr; | |
803 | ||
65c19bbd | 804 | mutex_lock(&performance_mutex); |
1da177e4 | 805 | |
706546d0 | 806 | pr = per_cpu(processors, cpu); |
1da177e4 | 807 | if (!pr) { |
65c19bbd | 808 | mutex_unlock(&performance_mutex); |
d550d98d | 809 | return; |
1da177e4 LT |
810 | } |
811 | ||
a913f507 AM |
812 | if (pr->performance) |
813 | kfree(pr->performance->states); | |
1da177e4 LT |
814 | pr->performance = NULL; |
815 | ||
65c19bbd | 816 | mutex_unlock(&performance_mutex); |
1da177e4 | 817 | |
d550d98d | 818 | return; |
1da177e4 | 819 | } |
4be44fcd | 820 | |
1da177e4 | 821 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |