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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" | |
47 | #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" | |
48 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" | |
49 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
4be44fcd | 50 | ACPI_MODULE_NAME("acpi_processor") |
1da177e4 | 51 | |
65c19bbd | 52 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 LT |
53 | |
54 | /* | |
55 | * _PPC support is implemented as a CPUfreq policy notifier: | |
56 | * This means each time a CPUfreq driver registered also with | |
57 | * the ACPI core is asked to change the speed policy, the maximum | |
58 | * value is adjusted so that it is within the platform limit. | |
59 | * | |
60 | * Also, when a new platform limit value is detected, the CPUfreq | |
61 | * policy is adjusted accordingly. | |
62 | */ | |
63 | ||
64 | #define PPC_REGISTERED 1 | |
65 | #define PPC_IN_USE 2 | |
66 | ||
67 | static int acpi_processor_ppc_status = 0; | |
68 | ||
69 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 70 | unsigned long event, void *data) |
1da177e4 LT |
71 | { |
72 | struct cpufreq_policy *policy = data; | |
73 | struct acpi_processor *pr; | |
74 | unsigned int ppc = 0; | |
75 | ||
65c19bbd | 76 | mutex_lock(&performance_mutex); |
1da177e4 LT |
77 | |
78 | if (event != CPUFREQ_INCOMPATIBLE) | |
79 | goto out; | |
80 | ||
81 | pr = processors[policy->cpu]; | |
82 | if (!pr || !pr->performance) | |
83 | goto out; | |
84 | ||
4be44fcd | 85 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 86 | |
0916bd3e | 87 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
88 | goto out; |
89 | ||
90 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
91 | pr->performance->states[ppc]. |
92 | core_frequency * 1000); | |
1da177e4 | 93 | |
4be44fcd | 94 | out: |
65c19bbd | 95 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
96 | |
97 | return 0; | |
98 | } | |
99 | ||
1da177e4 LT |
100 | static struct notifier_block acpi_ppc_notifier_block = { |
101 | .notifier_call = acpi_processor_ppc_notifier, | |
102 | }; | |
103 | ||
4be44fcd | 104 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 105 | { |
4be44fcd LB |
106 | acpi_status status = 0; |
107 | unsigned long ppc = 0; | |
1da177e4 | 108 | |
1da177e4 LT |
109 | |
110 | if (!pr) | |
d550d98d | 111 | return -EINVAL; |
1da177e4 LT |
112 | |
113 | /* | |
114 | * _PPC indicates the maximum state currently supported by the platform | |
115 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
116 | */ | |
117 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
118 | ||
119 | if (status != AE_NOT_FOUND) | |
120 | acpi_processor_ppc_status |= PPC_IN_USE; | |
121 | ||
4be44fcd | 122 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 123 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 124 | return -ENODEV; |
1da177e4 LT |
125 | } |
126 | ||
4be44fcd | 127 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 128 | |
d550d98d | 129 | return 0; |
1da177e4 LT |
130 | } |
131 | ||
4be44fcd | 132 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr) |
1da177e4 LT |
133 | { |
134 | int ret = acpi_processor_get_platform_limit(pr); | |
135 | if (ret < 0) | |
136 | return (ret); | |
137 | else | |
138 | return cpufreq_update_policy(pr->id); | |
139 | } | |
140 | ||
4be44fcd LB |
141 | void acpi_processor_ppc_init(void) |
142 | { | |
143 | if (!cpufreq_register_notifier | |
144 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
145 | acpi_processor_ppc_status |= PPC_REGISTERED; |
146 | else | |
4be44fcd LB |
147 | printk(KERN_DEBUG |
148 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
149 | } |
150 | ||
4be44fcd LB |
151 | void acpi_processor_ppc_exit(void) |
152 | { | |
1da177e4 | 153 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
154 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
155 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
156 | |
157 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
158 | } | |
159 | ||
4be44fcd | 160 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 161 | { |
4be44fcd LB |
162 | int result = 0; |
163 | acpi_status status = 0; | |
164 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
165 | union acpi_object *pct = NULL; | |
166 | union acpi_object obj = { 0 }; | |
1da177e4 | 167 | |
1da177e4 LT |
168 | |
169 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 170 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 171 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 172 | return -ENODEV; |
1da177e4 LT |
173 | } |
174 | ||
4be44fcd | 175 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 176 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 177 | || (pct->package.count != 2)) { |
6468463a | 178 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
179 | result = -EFAULT; |
180 | goto end; | |
181 | } | |
182 | ||
183 | /* | |
184 | * control_register | |
185 | */ | |
186 | ||
187 | obj = pct->package.elements[0]; | |
188 | ||
189 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
190 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
191 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 192 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
193 | result = -EFAULT; |
194 | goto end; | |
195 | } | |
4be44fcd LB |
196 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
197 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
198 | |
199 | /* | |
200 | * status_register | |
201 | */ | |
202 | ||
203 | obj = pct->package.elements[1]; | |
204 | ||
205 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
206 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
207 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 208 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
209 | result = -EFAULT; |
210 | goto end; | |
211 | } | |
212 | ||
4be44fcd LB |
213 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
214 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 215 | |
4be44fcd | 216 | end: |
02438d87 | 217 | kfree(buffer.pointer); |
1da177e4 | 218 | |
d550d98d | 219 | return result; |
1da177e4 LT |
220 | } |
221 | ||
4be44fcd | 222 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 223 | { |
4be44fcd LB |
224 | int result = 0; |
225 | acpi_status status = AE_OK; | |
226 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
227 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
228 | struct acpi_buffer state = { 0, NULL }; | |
229 | union acpi_object *pss = NULL; | |
230 | int i; | |
1da177e4 | 231 | |
1da177e4 LT |
232 | |
233 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 234 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 235 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 236 | return -ENODEV; |
1da177e4 LT |
237 | } |
238 | ||
50dd0969 | 239 | pss = buffer.pointer; |
1da177e4 | 240 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 241 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
242 | result = -EFAULT; |
243 | goto end; | |
244 | } | |
245 | ||
246 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 247 | pss->package.count)); |
1da177e4 LT |
248 | |
249 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
250 | pr->performance->states = |
251 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
252 | GFP_KERNEL); | |
1da177e4 LT |
253 | if (!pr->performance->states) { |
254 | result = -ENOMEM; | |
255 | goto end; | |
256 | } | |
257 | ||
258 | for (i = 0; i < pr->performance->state_count; i++) { | |
259 | ||
260 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
261 | ||
262 | state.length = sizeof(struct acpi_processor_px); | |
263 | state.pointer = px; | |
264 | ||
265 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
266 | ||
267 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 268 | &format, &state); |
1da177e4 | 269 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 270 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
271 | result = -EFAULT; |
272 | kfree(pr->performance->states); | |
273 | goto end; | |
274 | } | |
275 | ||
276 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
277 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
278 | i, | |
279 | (u32) px->core_frequency, | |
280 | (u32) px->power, | |
281 | (u32) px->transition_latency, | |
282 | (u32) px->bus_master_latency, | |
283 | (u32) px->control, (u32) px->status)); | |
1da177e4 LT |
284 | |
285 | if (!px->core_frequency) { | |
6468463a LB |
286 | printk(KERN_ERR PREFIX |
287 | "Invalid _PSS data: freq is zero\n"); | |
1da177e4 LT |
288 | result = -EFAULT; |
289 | kfree(pr->performance->states); | |
290 | goto end; | |
291 | } | |
292 | } | |
293 | ||
4be44fcd | 294 | end: |
02438d87 | 295 | kfree(buffer.pointer); |
1da177e4 | 296 | |
d550d98d | 297 | return result; |
1da177e4 LT |
298 | } |
299 | ||
4be44fcd | 300 | static int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 301 | { |
4be44fcd LB |
302 | int result = 0; |
303 | acpi_status status = AE_OK; | |
304 | acpi_handle handle = NULL; | |
1da177e4 | 305 | |
1da177e4 LT |
306 | |
307 | if (!pr || !pr->performance || !pr->handle) | |
d550d98d | 308 | return -EINVAL; |
1da177e4 | 309 | |
1da177e4 LT |
310 | status = acpi_get_handle(pr->handle, "_PCT", &handle); |
311 | if (ACPI_FAILURE(status)) { | |
312 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 313 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 314 | return -ENODEV; |
1da177e4 LT |
315 | } |
316 | ||
317 | result = acpi_processor_get_performance_control(pr); | |
318 | if (result) | |
d550d98d | 319 | return result; |
1da177e4 LT |
320 | |
321 | result = acpi_processor_get_performance_states(pr); | |
322 | if (result) | |
d550d98d | 323 | return result; |
1da177e4 | 324 | |
d550d98d | 325 | return 0; |
1da177e4 LT |
326 | } |
327 | ||
4be44fcd LB |
328 | int acpi_processor_notify_smm(struct module *calling_module) |
329 | { | |
330 | acpi_status status; | |
331 | static int is_done = 0; | |
1da177e4 | 332 | |
1da177e4 LT |
333 | |
334 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 335 | return -EBUSY; |
1da177e4 LT |
336 | |
337 | if (!try_module_get(calling_module)) | |
d550d98d | 338 | return -EINVAL; |
1da177e4 LT |
339 | |
340 | /* is_done is set to negative if an error occured, | |
341 | * and to postitive if _no_ error occured, but SMM | |
342 | * was already notified. This avoids double notification | |
343 | * which might lead to unexpected results... | |
344 | */ | |
345 | if (is_done > 0) { | |
346 | module_put(calling_module); | |
d550d98d | 347 | return 0; |
4be44fcd | 348 | } else if (is_done < 0) { |
1da177e4 | 349 | module_put(calling_module); |
d550d98d | 350 | return is_done; |
1da177e4 LT |
351 | } |
352 | ||
353 | is_done = -EIO; | |
354 | ||
ad71860a AS |
355 | /* Can't write pstate_control to smi_command if either value is zero */ |
356 | if ((!acpi_fadt.smi_command) || (!acpi_fadt.pstate_control)) { | |
357 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); | |
1da177e4 | 358 | module_put(calling_module); |
d550d98d | 359 | return 0; |
1da177e4 LT |
360 | } |
361 | ||
4be44fcd | 362 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a AS |
363 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
364 | acpi_fadt.pstate_control, acpi_fadt.smi_command)); | |
1da177e4 | 365 | |
ad71860a AS |
366 | status = acpi_os_write_port(acpi_fadt.smi_command, |
367 | (u32) acpi_fadt.pstate_control, 8); | |
4be44fcd | 368 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 369 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a AS |
370 | "Failed to write pstate_control [0x%x] to " |
371 | "smi_command [0x%x]", acpi_fadt.pstate_control, | |
372 | acpi_fadt.smi_command)); | |
1da177e4 | 373 | module_put(calling_module); |
d550d98d | 374 | return status; |
1da177e4 LT |
375 | } |
376 | ||
377 | /* Success. If there's no _PPC, we need to fear nothing, so | |
378 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
379 | is_done = 1; | |
380 | ||
381 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
382 | module_put(calling_module); | |
383 | ||
d550d98d | 384 | return 0; |
1da177e4 | 385 | } |
1da177e4 | 386 | |
4be44fcd | 387 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 LT |
388 | |
389 | #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF | |
390 | /* /proc/acpi/processor/../performance interface (DEPRECATED) */ | |
391 | ||
392 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file); | |
393 | static struct file_operations acpi_processor_perf_fops = { | |
4be44fcd LB |
394 | .open = acpi_processor_perf_open_fs, |
395 | .read = seq_read, | |
396 | .llseek = seq_lseek, | |
397 | .release = single_release, | |
1da177e4 LT |
398 | }; |
399 | ||
400 | static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset) | |
401 | { | |
50dd0969 | 402 | struct acpi_processor *pr = seq->private; |
4be44fcd | 403 | int i; |
1da177e4 | 404 | |
1da177e4 LT |
405 | |
406 | if (!pr) | |
407 | goto end; | |
408 | ||
409 | if (!pr->performance) { | |
410 | seq_puts(seq, "<not supported>\n"); | |
411 | goto end; | |
412 | } | |
413 | ||
414 | seq_printf(seq, "state count: %d\n" | |
4be44fcd LB |
415 | "active state: P%d\n", |
416 | pr->performance->state_count, pr->performance->state); | |
1da177e4 LT |
417 | |
418 | seq_puts(seq, "states:\n"); | |
419 | for (i = 0; i < pr->performance->state_count; i++) | |
4be44fcd LB |
420 | seq_printf(seq, |
421 | " %cP%d: %d MHz, %d mW, %d uS\n", | |
422 | (i == pr->performance->state ? '*' : ' '), i, | |
423 | (u32) pr->performance->states[i].core_frequency, | |
424 | (u32) pr->performance->states[i].power, | |
425 | (u32) pr->performance->states[i].transition_latency); | |
426 | ||
427 | end: | |
d550d98d | 428 | return 0; |
1da177e4 LT |
429 | } |
430 | ||
431 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file) | |
432 | { | |
433 | return single_open(file, acpi_processor_perf_seq_show, | |
4be44fcd | 434 | PDE(inode)->data); |
1da177e4 LT |
435 | } |
436 | ||
437 | static ssize_t | |
4be44fcd LB |
438 | acpi_processor_write_performance(struct file *file, |
439 | const char __user * buffer, | |
440 | size_t count, loff_t * data) | |
1da177e4 | 441 | { |
4be44fcd | 442 | int result = 0; |
50dd0969 JE |
443 | struct seq_file *m = file->private_data; |
444 | struct acpi_processor *pr = m->private; | |
1da177e4 | 445 | struct acpi_processor_performance *perf; |
4be44fcd LB |
446 | char state_string[12] = { '\0' }; |
447 | unsigned int new_state = 0; | |
448 | struct cpufreq_policy policy; | |
1da177e4 | 449 | |
1da177e4 LT |
450 | |
451 | if (!pr || (count > sizeof(state_string) - 1)) | |
d550d98d | 452 | return -EINVAL; |
1da177e4 LT |
453 | |
454 | perf = pr->performance; | |
455 | if (!perf) | |
d550d98d | 456 | return -EINVAL; |
1da177e4 LT |
457 | |
458 | if (copy_from_user(state_string, buffer, count)) | |
d550d98d | 459 | return -EFAULT; |
1da177e4 LT |
460 | |
461 | state_string[count] = '\0'; | |
462 | new_state = simple_strtoul(state_string, NULL, 0); | |
463 | ||
464 | if (new_state >= perf->state_count) | |
d550d98d | 465 | return -EINVAL; |
1da177e4 LT |
466 | |
467 | cpufreq_get_policy(&policy, pr->id); | |
468 | ||
469 | policy.cpu = pr->id; | |
470 | policy.min = perf->states[new_state].core_frequency * 1000; | |
471 | policy.max = perf->states[new_state].core_frequency * 1000; | |
472 | ||
473 | result = cpufreq_set_policy(&policy); | |
474 | if (result) | |
d550d98d | 475 | return result; |
1da177e4 | 476 | |
d550d98d | 477 | return count; |
1da177e4 LT |
478 | } |
479 | ||
4be44fcd | 480 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
1da177e4 | 481 | { |
4be44fcd LB |
482 | struct proc_dir_entry *entry = NULL; |
483 | struct acpi_device *device = NULL; | |
1da177e4 | 484 | |
1da177e4 LT |
485 | |
486 | if (acpi_bus_get_device(pr->handle, &device)) | |
d550d98d | 487 | return; |
1da177e4 LT |
488 | |
489 | /* add file 'performance' [R/W] */ | |
490 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, | |
4be44fcd LB |
491 | S_IFREG | S_IRUGO | S_IWUSR, |
492 | acpi_device_dir(device)); | |
a6fc6720 | 493 | if (entry){ |
d479e908 | 494 | acpi_processor_perf_fops.write = acpi_processor_write_performance; |
1da177e4 | 495 | entry->proc_fops = &acpi_processor_perf_fops; |
1da177e4 LT |
496 | entry->data = acpi_driver_data(device); |
497 | entry->owner = THIS_MODULE; | |
498 | } | |
d550d98d | 499 | return; |
1da177e4 LT |
500 | } |
501 | ||
4be44fcd | 502 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) |
1da177e4 | 503 | { |
4be44fcd | 504 | struct acpi_device *device = NULL; |
1da177e4 | 505 | |
1da177e4 LT |
506 | |
507 | if (acpi_bus_get_device(pr->handle, &device)) | |
d550d98d | 508 | return; |
1da177e4 LT |
509 | |
510 | /* remove file 'performance' */ | |
511 | remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, | |
4be44fcd | 512 | acpi_device_dir(device)); |
1da177e4 | 513 | |
d550d98d | 514 | return; |
1da177e4 LT |
515 | } |
516 | ||
517 | #else | |
4be44fcd LB |
518 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
519 | { | |
520 | return; | |
521 | } | |
522 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) | |
523 | { | |
524 | return; | |
525 | } | |
526 | #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */ | |
1da177e4 | 527 | |
3b2d9942 VP |
528 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
529 | { | |
530 | int result = 0; | |
531 | acpi_status status = AE_OK; | |
532 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
533 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
534 | struct acpi_buffer state = {0, NULL}; | |
535 | union acpi_object *psd = NULL; | |
536 | struct acpi_psd_package *pdomain; | |
537 | ||
3b2d9942 VP |
538 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
539 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 540 | return -ENODEV; |
3b2d9942 VP |
541 | } |
542 | ||
50dd0969 | 543 | psd = buffer.pointer; |
3b2d9942 VP |
544 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
545 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
546 | result = -EFAULT; | |
547 | goto end; | |
548 | } | |
549 | ||
550 | if (psd->package.count != 1) { | |
551 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
552 | result = -EFAULT; | |
553 | goto end; | |
554 | } | |
555 | ||
556 | pdomain = &(pr->performance->domain_info); | |
557 | ||
558 | state.length = sizeof(struct acpi_psd_package); | |
559 | state.pointer = pdomain; | |
560 | ||
561 | status = acpi_extract_package(&(psd->package.elements[0]), | |
562 | &format, &state); | |
563 | if (ACPI_FAILURE(status)) { | |
564 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
565 | result = -EFAULT; | |
566 | goto end; | |
567 | } | |
568 | ||
569 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
570 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n")); | |
571 | result = -EFAULT; | |
572 | goto end; | |
573 | } | |
574 | ||
575 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
576 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n")); | |
577 | result = -EFAULT; | |
578 | goto end; | |
579 | } | |
580 | ||
581 | end: | |
02438d87 | 582 | kfree(buffer.pointer); |
9011bff4 | 583 | return result; |
3b2d9942 VP |
584 | } |
585 | ||
586 | int acpi_processor_preregister_performance( | |
587 | struct acpi_processor_performance **performance) | |
588 | { | |
589 | int count, count_target; | |
590 | int retval = 0; | |
591 | unsigned int i, j; | |
592 | cpumask_t covered_cpus; | |
593 | struct acpi_processor *pr; | |
594 | struct acpi_psd_package *pdomain; | |
595 | struct acpi_processor *match_pr; | |
596 | struct acpi_psd_package *match_pdomain; | |
597 | ||
785fcccd | 598 | mutex_lock(&performance_mutex); |
3b2d9942 VP |
599 | |
600 | retval = 0; | |
601 | ||
602 | /* Call _PSD for all CPUs */ | |
193de0c7 | 603 | for_each_possible_cpu(i) { |
3b2d9942 VP |
604 | pr = processors[i]; |
605 | if (!pr) { | |
606 | /* Look only at processors in ACPI namespace */ | |
607 | continue; | |
608 | } | |
609 | ||
610 | if (pr->performance) { | |
611 | retval = -EBUSY; | |
612 | continue; | |
613 | } | |
614 | ||
615 | if (!performance || !performance[i]) { | |
616 | retval = -EINVAL; | |
617 | continue; | |
618 | } | |
619 | ||
620 | pr->performance = performance[i]; | |
621 | cpu_set(i, pr->performance->shared_cpu_map); | |
622 | if (acpi_processor_get_psd(pr)) { | |
623 | retval = -EINVAL; | |
624 | continue; | |
625 | } | |
626 | } | |
627 | if (retval) | |
628 | goto err_ret; | |
629 | ||
630 | /* | |
631 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
632 | * domain info. | |
633 | */ | |
193de0c7 | 634 | for_each_possible_cpu(i) { |
3b2d9942 VP |
635 | pr = processors[i]; |
636 | if (!pr) | |
637 | continue; | |
638 | ||
639 | /* Basic validity check for domain info */ | |
640 | pdomain = &(pr->performance->domain_info); | |
641 | if ((pdomain->revision != ACPI_PSD_REV0_REVISION) || | |
642 | (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) { | |
643 | retval = -EINVAL; | |
644 | goto err_ret; | |
645 | } | |
646 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
647 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
648 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
649 | retval = -EINVAL; | |
650 | goto err_ret; | |
651 | } | |
652 | } | |
653 | ||
654 | cpus_clear(covered_cpus); | |
193de0c7 | 655 | for_each_possible_cpu(i) { |
3b2d9942 VP |
656 | pr = processors[i]; |
657 | if (!pr) | |
658 | continue; | |
659 | ||
660 | if (cpu_isset(i, covered_cpus)) | |
661 | continue; | |
662 | ||
663 | pdomain = &(pr->performance->domain_info); | |
664 | cpu_set(i, pr->performance->shared_cpu_map); | |
665 | cpu_set(i, covered_cpus); | |
666 | if (pdomain->num_processors <= 1) | |
667 | continue; | |
668 | ||
669 | /* Validate the Domain info */ | |
670 | count_target = pdomain->num_processors; | |
671 | count = 1; | |
46f18e3a | 672 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 673 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
674 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
675 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
676 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 677 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 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 | /* Here i and j are in the same domain */ | |
692 | ||
693 | if (match_pdomain->num_processors != count_target) { | |
694 | retval = -EINVAL; | |
695 | goto err_ret; | |
696 | } | |
697 | ||
698 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
699 | retval = -EINVAL; | |
700 | goto err_ret; | |
701 | } | |
702 | ||
703 | cpu_set(j, covered_cpus); | |
704 | cpu_set(j, pr->performance->shared_cpu_map); | |
705 | count++; | |
706 | } | |
707 | ||
193de0c7 | 708 | for_each_possible_cpu(j) { |
3b2d9942 VP |
709 | if (i == j) |
710 | continue; | |
711 | ||
712 | match_pr = processors[j]; | |
713 | if (!match_pr) | |
714 | continue; | |
715 | ||
716 | match_pdomain = &(match_pr->performance->domain_info); | |
717 | if (match_pdomain->domain != pdomain->domain) | |
718 | continue; | |
719 | ||
720 | match_pr->performance->shared_type = | |
721 | pr->performance->shared_type; | |
722 | match_pr->performance->shared_cpu_map = | |
723 | pr->performance->shared_cpu_map; | |
724 | } | |
725 | } | |
726 | ||
727 | err_ret: | |
193de0c7 | 728 | for_each_possible_cpu(i) { |
3b2d9942 VP |
729 | pr = processors[i]; |
730 | if (!pr || !pr->performance) | |
731 | continue; | |
732 | ||
733 | /* Assume no coordination on any error parsing domain info */ | |
734 | if (retval) { | |
735 | cpus_clear(pr->performance->shared_cpu_map); | |
736 | cpu_set(i, pr->performance->shared_cpu_map); | |
737 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; | |
738 | } | |
739 | pr->performance = NULL; /* Will be set for real in register */ | |
740 | } | |
741 | ||
785fcccd | 742 | mutex_unlock(&performance_mutex); |
9011bff4 | 743 | return retval; |
3b2d9942 VP |
744 | } |
745 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
746 | ||
747 | ||
1da177e4 | 748 | int |
4be44fcd LB |
749 | acpi_processor_register_performance(struct acpi_processor_performance |
750 | *performance, unsigned int cpu) | |
1da177e4 LT |
751 | { |
752 | struct acpi_processor *pr; | |
753 | ||
1da177e4 LT |
754 | |
755 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 756 | return -EINVAL; |
1da177e4 | 757 | |
65c19bbd | 758 | mutex_lock(&performance_mutex); |
1da177e4 LT |
759 | |
760 | pr = processors[cpu]; | |
761 | if (!pr) { | |
65c19bbd | 762 | mutex_unlock(&performance_mutex); |
d550d98d | 763 | return -ENODEV; |
1da177e4 LT |
764 | } |
765 | ||
766 | if (pr->performance) { | |
65c19bbd | 767 | mutex_unlock(&performance_mutex); |
d550d98d | 768 | return -EBUSY; |
1da177e4 LT |
769 | } |
770 | ||
a913f507 AM |
771 | WARN_ON(!performance); |
772 | ||
1da177e4 LT |
773 | pr->performance = performance; |
774 | ||
775 | if (acpi_processor_get_performance_info(pr)) { | |
776 | pr->performance = NULL; | |
65c19bbd | 777 | mutex_unlock(&performance_mutex); |
d550d98d | 778 | return -EIO; |
1da177e4 LT |
779 | } |
780 | ||
781 | acpi_cpufreq_add_file(pr); | |
782 | ||
65c19bbd | 783 | mutex_unlock(&performance_mutex); |
d550d98d | 784 | return 0; |
1da177e4 | 785 | } |
1da177e4 | 786 | |
4be44fcd | 787 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
788 | |
789 | void | |
4be44fcd LB |
790 | acpi_processor_unregister_performance(struct acpi_processor_performance |
791 | *performance, unsigned int cpu) | |
1da177e4 LT |
792 | { |
793 | struct acpi_processor *pr; | |
794 | ||
1da177e4 | 795 | |
65c19bbd | 796 | mutex_lock(&performance_mutex); |
1da177e4 LT |
797 | |
798 | pr = processors[cpu]; | |
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 | ||
808 | acpi_cpufreq_remove_file(pr); | |
809 | ||
65c19bbd | 810 | mutex_unlock(&performance_mutex); |
1da177e4 | 811 | |
d550d98d | 812 | return; |
1da177e4 | 813 | } |
4be44fcd | 814 | |
1da177e4 | 815 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |