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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> | |
33 | ||
34 | #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF | |
35 | #include <linux/proc_fs.h> | |
36 | #include <linux/seq_file.h> | |
65c19bbd | 37 | #include <linux/mutex.h> |
1da177e4 LT |
38 | |
39 | #include <asm/uaccess.h> | |
40 | #endif | |
41 | ||
42 | #include <acpi/acpi_bus.h> | |
43 | #include <acpi/processor.h> | |
44 | ||
1da177e4 LT |
45 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 |
46 | #define ACPI_PROCESSOR_CLASS "processor" | |
1da177e4 LT |
47 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
48 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
f52fd66d | 49 | ACPI_MODULE_NAME("processor_perflib"); |
1da177e4 | 50 | |
65c19bbd | 51 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 | 52 | |
919158d1 TR |
53 | /* Use cpufreq debug layer for _PPC changes. */ |
54 | #define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \ | |
55 | "cpufreq-core", msg) | |
56 | ||
1da177e4 LT |
57 | /* |
58 | * _PPC support is implemented as a CPUfreq policy notifier: | |
59 | * This means each time a CPUfreq driver registered also with | |
60 | * the ACPI core is asked to change the speed policy, the maximum | |
61 | * value is adjusted so that it is within the platform limit. | |
62 | * | |
63 | * Also, when a new platform limit value is detected, the CPUfreq | |
64 | * policy is adjusted accordingly. | |
65 | */ | |
66 | ||
623b78c3 TR |
67 | static unsigned int ignore_ppc = 0; |
68 | module_param(ignore_ppc, uint, 0644); | |
69 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ | |
70 | "limited by BIOS, this should help"); | |
71 | ||
1da177e4 LT |
72 | #define PPC_REGISTERED 1 |
73 | #define PPC_IN_USE 2 | |
74 | ||
75 | static int acpi_processor_ppc_status = 0; | |
76 | ||
77 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 78 | unsigned long event, void *data) |
1da177e4 LT |
79 | { |
80 | struct cpufreq_policy *policy = data; | |
81 | struct acpi_processor *pr; | |
82 | unsigned int ppc = 0; | |
83 | ||
623b78c3 TR |
84 | if (ignore_ppc) |
85 | return 0; | |
86 | ||
65c19bbd | 87 | mutex_lock(&performance_mutex); |
1da177e4 LT |
88 | |
89 | if (event != CPUFREQ_INCOMPATIBLE) | |
90 | goto out; | |
91 | ||
92 | pr = processors[policy->cpu]; | |
93 | if (!pr || !pr->performance) | |
94 | goto out; | |
95 | ||
4be44fcd | 96 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 97 | |
0916bd3e | 98 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
99 | goto out; |
100 | ||
101 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
102 | pr->performance->states[ppc]. |
103 | core_frequency * 1000); | |
1da177e4 | 104 | |
4be44fcd | 105 | out: |
65c19bbd | 106 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
107 | |
108 | return 0; | |
109 | } | |
110 | ||
1da177e4 LT |
111 | static struct notifier_block acpi_ppc_notifier_block = { |
112 | .notifier_call = acpi_processor_ppc_notifier, | |
113 | }; | |
114 | ||
4be44fcd | 115 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 116 | { |
4be44fcd LB |
117 | acpi_status status = 0; |
118 | unsigned long ppc = 0; | |
1da177e4 | 119 | |
1da177e4 LT |
120 | |
121 | if (!pr) | |
d550d98d | 122 | return -EINVAL; |
1da177e4 LT |
123 | |
124 | /* | |
125 | * _PPC indicates the maximum state currently supported by the platform | |
126 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
127 | */ | |
128 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
129 | ||
130 | if (status != AE_NOT_FOUND) | |
131 | acpi_processor_ppc_status |= PPC_IN_USE; | |
132 | ||
4be44fcd | 133 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 134 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 135 | return -ENODEV; |
1da177e4 LT |
136 | } |
137 | ||
919158d1 TR |
138 | cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
139 | (int)ppc, ppc ? "" : "not"); | |
140 | ||
4be44fcd | 141 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 142 | |
d550d98d | 143 | return 0; |
1da177e4 LT |
144 | } |
145 | ||
4be44fcd | 146 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr) |
1da177e4 | 147 | { |
623b78c3 TR |
148 | int ret; |
149 | ||
150 | if (ignore_ppc) | |
151 | return 0; | |
152 | ||
153 | ret = acpi_processor_get_platform_limit(pr); | |
154 | ||
1da177e4 LT |
155 | if (ret < 0) |
156 | return (ret); | |
157 | else | |
158 | return cpufreq_update_policy(pr->id); | |
159 | } | |
160 | ||
4be44fcd LB |
161 | void acpi_processor_ppc_init(void) |
162 | { | |
163 | if (!cpufreq_register_notifier | |
164 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
165 | acpi_processor_ppc_status |= PPC_REGISTERED; |
166 | else | |
4be44fcd LB |
167 | printk(KERN_DEBUG |
168 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
169 | } |
170 | ||
4be44fcd LB |
171 | void acpi_processor_ppc_exit(void) |
172 | { | |
1da177e4 | 173 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
174 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
175 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
176 | |
177 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
178 | } | |
179 | ||
4be44fcd | 180 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 181 | { |
4be44fcd LB |
182 | int result = 0; |
183 | acpi_status status = 0; | |
184 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
185 | union acpi_object *pct = NULL; | |
186 | union acpi_object obj = { 0 }; | |
1da177e4 | 187 | |
1da177e4 LT |
188 | |
189 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 190 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 191 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 192 | return -ENODEV; |
1da177e4 LT |
193 | } |
194 | ||
4be44fcd | 195 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 196 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 197 | || (pct->package.count != 2)) { |
6468463a | 198 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
199 | result = -EFAULT; |
200 | goto end; | |
201 | } | |
202 | ||
203 | /* | |
204 | * control_register | |
205 | */ | |
206 | ||
207 | obj = pct->package.elements[0]; | |
208 | ||
209 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
210 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
211 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 212 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
213 | result = -EFAULT; |
214 | goto end; | |
215 | } | |
4be44fcd LB |
216 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
217 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
218 | |
219 | /* | |
220 | * status_register | |
221 | */ | |
222 | ||
223 | obj = pct->package.elements[1]; | |
224 | ||
225 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
226 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
227 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 228 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
229 | result = -EFAULT; |
230 | goto end; | |
231 | } | |
232 | ||
4be44fcd LB |
233 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
234 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 235 | |
4be44fcd | 236 | end: |
02438d87 | 237 | kfree(buffer.pointer); |
1da177e4 | 238 | |
d550d98d | 239 | return result; |
1da177e4 LT |
240 | } |
241 | ||
4be44fcd | 242 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 243 | { |
4be44fcd LB |
244 | int result = 0; |
245 | acpi_status status = AE_OK; | |
246 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
247 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
248 | struct acpi_buffer state = { 0, NULL }; | |
249 | union acpi_object *pss = NULL; | |
250 | int i; | |
1da177e4 | 251 | |
1da177e4 LT |
252 | |
253 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 254 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 255 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 256 | return -ENODEV; |
1da177e4 LT |
257 | } |
258 | ||
50dd0969 | 259 | pss = buffer.pointer; |
1da177e4 | 260 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 261 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
262 | result = -EFAULT; |
263 | goto end; | |
264 | } | |
265 | ||
266 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 267 | pss->package.count)); |
1da177e4 LT |
268 | |
269 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
270 | pr->performance->states = |
271 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
272 | GFP_KERNEL); | |
1da177e4 LT |
273 | if (!pr->performance->states) { |
274 | result = -ENOMEM; | |
275 | goto end; | |
276 | } | |
277 | ||
278 | for (i = 0; i < pr->performance->state_count; i++) { | |
279 | ||
280 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
281 | ||
282 | state.length = sizeof(struct acpi_processor_px); | |
283 | state.pointer = px; | |
284 | ||
285 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
286 | ||
287 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 288 | &format, &state); |
1da177e4 | 289 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 290 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
291 | result = -EFAULT; |
292 | kfree(pr->performance->states); | |
293 | goto end; | |
294 | } | |
295 | ||
296 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
297 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
298 | i, | |
299 | (u32) px->core_frequency, | |
300 | (u32) px->power, | |
301 | (u32) px->transition_latency, | |
302 | (u32) px->bus_master_latency, | |
303 | (u32) px->control, (u32) px->status)); | |
1da177e4 LT |
304 | |
305 | if (!px->core_frequency) { | |
6468463a LB |
306 | printk(KERN_ERR PREFIX |
307 | "Invalid _PSS data: freq is zero\n"); | |
1da177e4 LT |
308 | result = -EFAULT; |
309 | kfree(pr->performance->states); | |
310 | goto end; | |
311 | } | |
312 | } | |
313 | ||
4be44fcd | 314 | end: |
02438d87 | 315 | kfree(buffer.pointer); |
1da177e4 | 316 | |
d550d98d | 317 | return result; |
1da177e4 LT |
318 | } |
319 | ||
4be44fcd | 320 | static int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 321 | { |
4be44fcd LB |
322 | int result = 0; |
323 | acpi_status status = AE_OK; | |
324 | acpi_handle handle = NULL; | |
1da177e4 | 325 | |
1da177e4 LT |
326 | |
327 | if (!pr || !pr->performance || !pr->handle) | |
d550d98d | 328 | return -EINVAL; |
1da177e4 | 329 | |
1da177e4 LT |
330 | status = acpi_get_handle(pr->handle, "_PCT", &handle); |
331 | if (ACPI_FAILURE(status)) { | |
332 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 333 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 334 | return -ENODEV; |
1da177e4 LT |
335 | } |
336 | ||
337 | result = acpi_processor_get_performance_control(pr); | |
338 | if (result) | |
d550d98d | 339 | return result; |
1da177e4 LT |
340 | |
341 | result = acpi_processor_get_performance_states(pr); | |
342 | if (result) | |
d550d98d | 343 | return result; |
1da177e4 | 344 | |
d550d98d | 345 | return 0; |
1da177e4 LT |
346 | } |
347 | ||
4be44fcd LB |
348 | int acpi_processor_notify_smm(struct module *calling_module) |
349 | { | |
350 | acpi_status status; | |
351 | static int is_done = 0; | |
1da177e4 | 352 | |
1da177e4 LT |
353 | |
354 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 355 | return -EBUSY; |
1da177e4 LT |
356 | |
357 | if (!try_module_get(calling_module)) | |
d550d98d | 358 | return -EINVAL; |
1da177e4 LT |
359 | |
360 | /* is_done is set to negative if an error occured, | |
361 | * and to postitive if _no_ error occured, but SMM | |
362 | * was already notified. This avoids double notification | |
363 | * which might lead to unexpected results... | |
364 | */ | |
365 | if (is_done > 0) { | |
366 | module_put(calling_module); | |
d550d98d | 367 | return 0; |
4be44fcd | 368 | } else if (is_done < 0) { |
1da177e4 | 369 | module_put(calling_module); |
d550d98d | 370 | return is_done; |
1da177e4 LT |
371 | } |
372 | ||
373 | is_done = -EIO; | |
374 | ||
ad71860a | 375 | /* Can't write pstate_control to smi_command if either value is zero */ |
cee324b1 | 376 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
ad71860a | 377 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 378 | module_put(calling_module); |
d550d98d | 379 | return 0; |
1da177e4 LT |
380 | } |
381 | ||
4be44fcd | 382 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a | 383 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
cee324b1 | 384 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
1da177e4 | 385 | |
cee324b1 AS |
386 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
387 | (u32) acpi_gbl_FADT.pstate_control, 8); | |
4be44fcd | 388 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 389 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a | 390 | "Failed to write pstate_control [0x%x] to " |
cee324b1 AS |
391 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
392 | acpi_gbl_FADT.smi_command)); | |
1da177e4 | 393 | module_put(calling_module); |
d550d98d | 394 | return status; |
1da177e4 LT |
395 | } |
396 | ||
397 | /* Success. If there's no _PPC, we need to fear nothing, so | |
398 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
399 | is_done = 1; | |
400 | ||
401 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
402 | module_put(calling_module); | |
403 | ||
d550d98d | 404 | return 0; |
1da177e4 | 405 | } |
1da177e4 | 406 | |
4be44fcd | 407 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 LT |
408 | |
409 | #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF | |
410 | /* /proc/acpi/processor/../performance interface (DEPRECATED) */ | |
411 | ||
412 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file); | |
413 | static struct file_operations acpi_processor_perf_fops = { | |
cf7acfab | 414 | .owner = THIS_MODULE, |
4be44fcd LB |
415 | .open = acpi_processor_perf_open_fs, |
416 | .read = seq_read, | |
417 | .llseek = seq_lseek, | |
418 | .release = single_release, | |
1da177e4 LT |
419 | }; |
420 | ||
421 | static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset) | |
422 | { | |
50dd0969 | 423 | struct acpi_processor *pr = seq->private; |
4be44fcd | 424 | int i; |
1da177e4 | 425 | |
1da177e4 LT |
426 | |
427 | if (!pr) | |
428 | goto end; | |
429 | ||
430 | if (!pr->performance) { | |
431 | seq_puts(seq, "<not supported>\n"); | |
432 | goto end; | |
433 | } | |
434 | ||
435 | seq_printf(seq, "state count: %d\n" | |
4be44fcd LB |
436 | "active state: P%d\n", |
437 | pr->performance->state_count, pr->performance->state); | |
1da177e4 LT |
438 | |
439 | seq_puts(seq, "states:\n"); | |
440 | for (i = 0; i < pr->performance->state_count; i++) | |
4be44fcd LB |
441 | seq_printf(seq, |
442 | " %cP%d: %d MHz, %d mW, %d uS\n", | |
443 | (i == pr->performance->state ? '*' : ' '), i, | |
444 | (u32) pr->performance->states[i].core_frequency, | |
445 | (u32) pr->performance->states[i].power, | |
446 | (u32) pr->performance->states[i].transition_latency); | |
447 | ||
448 | end: | |
d550d98d | 449 | return 0; |
1da177e4 LT |
450 | } |
451 | ||
452 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file) | |
453 | { | |
454 | return single_open(file, acpi_processor_perf_seq_show, | |
4be44fcd | 455 | PDE(inode)->data); |
1da177e4 LT |
456 | } |
457 | ||
4be44fcd | 458 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
1da177e4 | 459 | { |
4be44fcd | 460 | struct acpi_device *device = NULL; |
1da177e4 | 461 | |
1da177e4 LT |
462 | |
463 | if (acpi_bus_get_device(pr->handle, &device)) | |
d550d98d | 464 | return; |
1da177e4 LT |
465 | |
466 | /* add file 'performance' [R/W] */ | |
cf7acfab DL |
467 | proc_create_data(ACPI_PROCESSOR_FILE_PERFORMANCE, S_IFREG | S_IRUGO, |
468 | acpi_device_dir(device), | |
469 | &acpi_processor_perf_fops, acpi_driver_data(device)); | |
d550d98d | 470 | return; |
1da177e4 LT |
471 | } |
472 | ||
4be44fcd | 473 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) |
1da177e4 | 474 | { |
4be44fcd | 475 | struct acpi_device *device = NULL; |
1da177e4 | 476 | |
1da177e4 LT |
477 | |
478 | if (acpi_bus_get_device(pr->handle, &device)) | |
d550d98d | 479 | return; |
1da177e4 LT |
480 | |
481 | /* remove file 'performance' */ | |
482 | remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, | |
4be44fcd | 483 | acpi_device_dir(device)); |
1da177e4 | 484 | |
d550d98d | 485 | return; |
1da177e4 LT |
486 | } |
487 | ||
488 | #else | |
4be44fcd LB |
489 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
490 | { | |
491 | return; | |
492 | } | |
493 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) | |
494 | { | |
495 | return; | |
496 | } | |
497 | #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */ | |
1da177e4 | 498 | |
3b2d9942 VP |
499 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
500 | { | |
501 | int result = 0; | |
502 | acpi_status status = AE_OK; | |
503 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
504 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
505 | struct acpi_buffer state = {0, NULL}; | |
506 | union acpi_object *psd = NULL; | |
507 | struct acpi_psd_package *pdomain; | |
508 | ||
3b2d9942 VP |
509 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
510 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 511 | return -ENODEV; |
3b2d9942 VP |
512 | } |
513 | ||
50dd0969 | 514 | psd = buffer.pointer; |
3b2d9942 VP |
515 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
516 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
517 | result = -EFAULT; | |
518 | goto end; | |
519 | } | |
520 | ||
521 | if (psd->package.count != 1) { | |
522 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
523 | result = -EFAULT; | |
524 | goto end; | |
525 | } | |
526 | ||
527 | pdomain = &(pr->performance->domain_info); | |
528 | ||
529 | state.length = sizeof(struct acpi_psd_package); | |
530 | state.pointer = pdomain; | |
531 | ||
532 | status = acpi_extract_package(&(psd->package.elements[0]), | |
533 | &format, &state); | |
534 | if (ACPI_FAILURE(status)) { | |
535 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
536 | result = -EFAULT; | |
537 | goto end; | |
538 | } | |
539 | ||
540 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
541 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n")); | |
542 | result = -EFAULT; | |
543 | goto end; | |
544 | } | |
545 | ||
546 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
547 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n")); | |
548 | result = -EFAULT; | |
549 | goto end; | |
550 | } | |
551 | ||
552 | end: | |
02438d87 | 553 | kfree(buffer.pointer); |
9011bff4 | 554 | return result; |
3b2d9942 VP |
555 | } |
556 | ||
557 | int acpi_processor_preregister_performance( | |
50109292 | 558 | struct acpi_processor_performance *performance) |
3b2d9942 VP |
559 | { |
560 | int count, count_target; | |
561 | int retval = 0; | |
562 | unsigned int i, j; | |
563 | cpumask_t covered_cpus; | |
564 | struct acpi_processor *pr; | |
565 | struct acpi_psd_package *pdomain; | |
566 | struct acpi_processor *match_pr; | |
567 | struct acpi_psd_package *match_pdomain; | |
568 | ||
785fcccd | 569 | mutex_lock(&performance_mutex); |
3b2d9942 VP |
570 | |
571 | retval = 0; | |
572 | ||
573 | /* Call _PSD for all CPUs */ | |
193de0c7 | 574 | for_each_possible_cpu(i) { |
3b2d9942 VP |
575 | pr = processors[i]; |
576 | if (!pr) { | |
577 | /* Look only at processors in ACPI namespace */ | |
578 | continue; | |
579 | } | |
580 | ||
581 | if (pr->performance) { | |
582 | retval = -EBUSY; | |
583 | continue; | |
584 | } | |
585 | ||
50109292 | 586 | if (!performance || !percpu_ptr(performance, i)) { |
3b2d9942 VP |
587 | retval = -EINVAL; |
588 | continue; | |
589 | } | |
590 | ||
50109292 | 591 | pr->performance = percpu_ptr(performance, i); |
3b2d9942 VP |
592 | cpu_set(i, pr->performance->shared_cpu_map); |
593 | if (acpi_processor_get_psd(pr)) { | |
594 | retval = -EINVAL; | |
595 | continue; | |
596 | } | |
597 | } | |
598 | if (retval) | |
599 | goto err_ret; | |
600 | ||
601 | /* | |
602 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
603 | * domain info. | |
604 | */ | |
193de0c7 | 605 | for_each_possible_cpu(i) { |
3b2d9942 VP |
606 | pr = processors[i]; |
607 | if (!pr) | |
608 | continue; | |
609 | ||
610 | /* Basic validity check for domain info */ | |
611 | pdomain = &(pr->performance->domain_info); | |
612 | if ((pdomain->revision != ACPI_PSD_REV0_REVISION) || | |
613 | (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) { | |
614 | retval = -EINVAL; | |
615 | goto err_ret; | |
616 | } | |
617 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
618 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
619 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
620 | retval = -EINVAL; | |
621 | goto err_ret; | |
622 | } | |
623 | } | |
624 | ||
625 | cpus_clear(covered_cpus); | |
193de0c7 | 626 | for_each_possible_cpu(i) { |
3b2d9942 VP |
627 | pr = processors[i]; |
628 | if (!pr) | |
629 | continue; | |
630 | ||
631 | if (cpu_isset(i, covered_cpus)) | |
632 | continue; | |
633 | ||
634 | pdomain = &(pr->performance->domain_info); | |
635 | cpu_set(i, pr->performance->shared_cpu_map); | |
636 | cpu_set(i, covered_cpus); | |
637 | if (pdomain->num_processors <= 1) | |
638 | continue; | |
639 | ||
640 | /* Validate the Domain info */ | |
641 | count_target = pdomain->num_processors; | |
642 | count = 1; | |
46f18e3a | 643 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 644 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
645 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
646 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
647 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 648 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 649 | |
193de0c7 | 650 | for_each_possible_cpu(j) { |
3b2d9942 VP |
651 | if (i == j) |
652 | continue; | |
653 | ||
654 | match_pr = processors[j]; | |
655 | if (!match_pr) | |
656 | continue; | |
657 | ||
658 | match_pdomain = &(match_pr->performance->domain_info); | |
659 | if (match_pdomain->domain != pdomain->domain) | |
660 | continue; | |
661 | ||
662 | /* Here i and j are in the same domain */ | |
663 | ||
664 | if (match_pdomain->num_processors != count_target) { | |
665 | retval = -EINVAL; | |
666 | goto err_ret; | |
667 | } | |
668 | ||
669 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
670 | retval = -EINVAL; | |
671 | goto err_ret; | |
672 | } | |
673 | ||
674 | cpu_set(j, covered_cpus); | |
675 | cpu_set(j, pr->performance->shared_cpu_map); | |
676 | count++; | |
677 | } | |
678 | ||
193de0c7 | 679 | for_each_possible_cpu(j) { |
3b2d9942 VP |
680 | if (i == j) |
681 | continue; | |
682 | ||
683 | match_pr = processors[j]; | |
684 | if (!match_pr) | |
685 | continue; | |
686 | ||
687 | match_pdomain = &(match_pr->performance->domain_info); | |
688 | if (match_pdomain->domain != pdomain->domain) | |
689 | continue; | |
690 | ||
691 | match_pr->performance->shared_type = | |
692 | pr->performance->shared_type; | |
693 | match_pr->performance->shared_cpu_map = | |
694 | pr->performance->shared_cpu_map; | |
695 | } | |
696 | } | |
697 | ||
698 | err_ret: | |
193de0c7 | 699 | for_each_possible_cpu(i) { |
3b2d9942 VP |
700 | pr = processors[i]; |
701 | if (!pr || !pr->performance) | |
702 | continue; | |
703 | ||
704 | /* Assume no coordination on any error parsing domain info */ | |
705 | if (retval) { | |
706 | cpus_clear(pr->performance->shared_cpu_map); | |
707 | cpu_set(i, pr->performance->shared_cpu_map); | |
708 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; | |
709 | } | |
710 | pr->performance = NULL; /* Will be set for real in register */ | |
711 | } | |
712 | ||
785fcccd | 713 | mutex_unlock(&performance_mutex); |
9011bff4 | 714 | return retval; |
3b2d9942 VP |
715 | } |
716 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
717 | ||
718 | ||
1da177e4 | 719 | int |
4be44fcd LB |
720 | acpi_processor_register_performance(struct acpi_processor_performance |
721 | *performance, unsigned int cpu) | |
1da177e4 LT |
722 | { |
723 | struct acpi_processor *pr; | |
724 | ||
1da177e4 LT |
725 | |
726 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 727 | return -EINVAL; |
1da177e4 | 728 | |
65c19bbd | 729 | mutex_lock(&performance_mutex); |
1da177e4 LT |
730 | |
731 | pr = processors[cpu]; | |
732 | if (!pr) { | |
65c19bbd | 733 | mutex_unlock(&performance_mutex); |
d550d98d | 734 | return -ENODEV; |
1da177e4 LT |
735 | } |
736 | ||
737 | if (pr->performance) { | |
65c19bbd | 738 | mutex_unlock(&performance_mutex); |
d550d98d | 739 | return -EBUSY; |
1da177e4 LT |
740 | } |
741 | ||
a913f507 AM |
742 | WARN_ON(!performance); |
743 | ||
1da177e4 LT |
744 | pr->performance = performance; |
745 | ||
746 | if (acpi_processor_get_performance_info(pr)) { | |
747 | pr->performance = NULL; | |
65c19bbd | 748 | mutex_unlock(&performance_mutex); |
d550d98d | 749 | return -EIO; |
1da177e4 LT |
750 | } |
751 | ||
752 | acpi_cpufreq_add_file(pr); | |
753 | ||
65c19bbd | 754 | mutex_unlock(&performance_mutex); |
d550d98d | 755 | return 0; |
1da177e4 | 756 | } |
1da177e4 | 757 | |
4be44fcd | 758 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
759 | |
760 | void | |
4be44fcd LB |
761 | acpi_processor_unregister_performance(struct acpi_processor_performance |
762 | *performance, unsigned int cpu) | |
1da177e4 LT |
763 | { |
764 | struct acpi_processor *pr; | |
765 | ||
1da177e4 | 766 | |
65c19bbd | 767 | mutex_lock(&performance_mutex); |
1da177e4 LT |
768 | |
769 | pr = processors[cpu]; | |
770 | if (!pr) { | |
65c19bbd | 771 | mutex_unlock(&performance_mutex); |
d550d98d | 772 | return; |
1da177e4 LT |
773 | } |
774 | ||
a913f507 AM |
775 | if (pr->performance) |
776 | kfree(pr->performance->states); | |
1da177e4 LT |
777 | pr->performance = NULL; |
778 | ||
779 | acpi_cpufreq_remove_file(pr); | |
780 | ||
65c19bbd | 781 | mutex_unlock(&performance_mutex); |
1da177e4 | 782 | |
d550d98d | 783 | return; |
1da177e4 | 784 | } |
4be44fcd | 785 | |
1da177e4 | 786 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |