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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 | ||
355 | /* Can't write pstate_cnt to smi_cmd if either value is zero */ | |
4be44fcd LB |
356 | if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) { |
357 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n")); | |
1da177e4 | 358 | module_put(calling_module); |
d550d98d | 359 | return 0; |
1da177e4 LT |
360 | } |
361 | ||
4be44fcd LB |
362 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
363 | "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n", | |
364 | acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd)); | |
1da177e4 LT |
365 | |
366 | /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use | |
367 | * it anyway, so we need to support it... */ | |
368 | if (acpi_fadt_is_v1) { | |
4be44fcd LB |
369 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
370 | "Using v1.0 FADT reserved value for pstate_cnt\n")); | |
1da177e4 LT |
371 | } |
372 | ||
4be44fcd LB |
373 | status = acpi_os_write_port(acpi_fadt.smi_cmd, |
374 | (u32) acpi_fadt.pstate_cnt, 8); | |
375 | if (ACPI_FAILURE(status)) { | |
a6fc6720 TR |
376 | ACPI_EXCEPTION((AE_INFO, status, |
377 | "Failed to write pstate_cnt [0x%x] to " | |
378 | "smi_cmd [0x%x]", acpi_fadt.pstate_cnt, | |
379 | acpi_fadt.smi_cmd)); | |
1da177e4 | 380 | module_put(calling_module); |
d550d98d | 381 | return status; |
1da177e4 LT |
382 | } |
383 | ||
384 | /* Success. If there's no _PPC, we need to fear nothing, so | |
385 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
386 | is_done = 1; | |
387 | ||
388 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
389 | module_put(calling_module); | |
390 | ||
d550d98d | 391 | return 0; |
1da177e4 | 392 | } |
1da177e4 | 393 | |
4be44fcd | 394 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 LT |
395 | |
396 | #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF | |
397 | /* /proc/acpi/processor/../performance interface (DEPRECATED) */ | |
398 | ||
399 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file); | |
400 | static struct file_operations acpi_processor_perf_fops = { | |
4be44fcd LB |
401 | .open = acpi_processor_perf_open_fs, |
402 | .read = seq_read, | |
403 | .llseek = seq_lseek, | |
404 | .release = single_release, | |
1da177e4 LT |
405 | }; |
406 | ||
407 | static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset) | |
408 | { | |
50dd0969 | 409 | struct acpi_processor *pr = seq->private; |
4be44fcd | 410 | int i; |
1da177e4 | 411 | |
1da177e4 LT |
412 | |
413 | if (!pr) | |
414 | goto end; | |
415 | ||
416 | if (!pr->performance) { | |
417 | seq_puts(seq, "<not supported>\n"); | |
418 | goto end; | |
419 | } | |
420 | ||
421 | seq_printf(seq, "state count: %d\n" | |
4be44fcd LB |
422 | "active state: P%d\n", |
423 | pr->performance->state_count, pr->performance->state); | |
1da177e4 LT |
424 | |
425 | seq_puts(seq, "states:\n"); | |
426 | for (i = 0; i < pr->performance->state_count; i++) | |
4be44fcd LB |
427 | seq_printf(seq, |
428 | " %cP%d: %d MHz, %d mW, %d uS\n", | |
429 | (i == pr->performance->state ? '*' : ' '), i, | |
430 | (u32) pr->performance->states[i].core_frequency, | |
431 | (u32) pr->performance->states[i].power, | |
432 | (u32) pr->performance->states[i].transition_latency); | |
433 | ||
434 | end: | |
d550d98d | 435 | return 0; |
1da177e4 LT |
436 | } |
437 | ||
438 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file) | |
439 | { | |
440 | return single_open(file, acpi_processor_perf_seq_show, | |
4be44fcd | 441 | PDE(inode)->data); |
1da177e4 LT |
442 | } |
443 | ||
444 | static ssize_t | |
4be44fcd LB |
445 | acpi_processor_write_performance(struct file *file, |
446 | const char __user * buffer, | |
447 | size_t count, loff_t * data) | |
1da177e4 | 448 | { |
4be44fcd | 449 | int result = 0; |
50dd0969 JE |
450 | struct seq_file *m = file->private_data; |
451 | struct acpi_processor *pr = m->private; | |
1da177e4 | 452 | struct acpi_processor_performance *perf; |
4be44fcd LB |
453 | char state_string[12] = { '\0' }; |
454 | unsigned int new_state = 0; | |
455 | struct cpufreq_policy policy; | |
1da177e4 | 456 | |
1da177e4 LT |
457 | |
458 | if (!pr || (count > sizeof(state_string) - 1)) | |
d550d98d | 459 | return -EINVAL; |
1da177e4 LT |
460 | |
461 | perf = pr->performance; | |
462 | if (!perf) | |
d550d98d | 463 | return -EINVAL; |
1da177e4 LT |
464 | |
465 | if (copy_from_user(state_string, buffer, count)) | |
d550d98d | 466 | return -EFAULT; |
1da177e4 LT |
467 | |
468 | state_string[count] = '\0'; | |
469 | new_state = simple_strtoul(state_string, NULL, 0); | |
470 | ||
471 | if (new_state >= perf->state_count) | |
d550d98d | 472 | return -EINVAL; |
1da177e4 LT |
473 | |
474 | cpufreq_get_policy(&policy, pr->id); | |
475 | ||
476 | policy.cpu = pr->id; | |
477 | policy.min = perf->states[new_state].core_frequency * 1000; | |
478 | policy.max = perf->states[new_state].core_frequency * 1000; | |
479 | ||
480 | result = cpufreq_set_policy(&policy); | |
481 | if (result) | |
d550d98d | 482 | return result; |
1da177e4 | 483 | |
d550d98d | 484 | return count; |
1da177e4 LT |
485 | } |
486 | ||
4be44fcd | 487 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
1da177e4 | 488 | { |
4be44fcd LB |
489 | struct proc_dir_entry *entry = NULL; |
490 | struct acpi_device *device = NULL; | |
1da177e4 | 491 | |
1da177e4 LT |
492 | |
493 | if (acpi_bus_get_device(pr->handle, &device)) | |
d550d98d | 494 | return; |
1da177e4 LT |
495 | |
496 | /* add file 'performance' [R/W] */ | |
497 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, | |
4be44fcd LB |
498 | S_IFREG | S_IRUGO | S_IWUSR, |
499 | acpi_device_dir(device)); | |
a6fc6720 | 500 | if (entry){ |
d479e908 | 501 | acpi_processor_perf_fops.write = acpi_processor_write_performance; |
1da177e4 | 502 | entry->proc_fops = &acpi_processor_perf_fops; |
1da177e4 LT |
503 | entry->data = acpi_driver_data(device); |
504 | entry->owner = THIS_MODULE; | |
505 | } | |
d550d98d | 506 | return; |
1da177e4 LT |
507 | } |
508 | ||
4be44fcd | 509 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) |
1da177e4 | 510 | { |
4be44fcd | 511 | struct acpi_device *device = NULL; |
1da177e4 | 512 | |
1da177e4 LT |
513 | |
514 | if (acpi_bus_get_device(pr->handle, &device)) | |
d550d98d | 515 | return; |
1da177e4 LT |
516 | |
517 | /* remove file 'performance' */ | |
518 | remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, | |
4be44fcd | 519 | acpi_device_dir(device)); |
1da177e4 | 520 | |
d550d98d | 521 | return; |
1da177e4 LT |
522 | } |
523 | ||
524 | #else | |
4be44fcd LB |
525 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
526 | { | |
527 | return; | |
528 | } | |
529 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) | |
530 | { | |
531 | return; | |
532 | } | |
533 | #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */ | |
1da177e4 | 534 | |
3b2d9942 VP |
535 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
536 | { | |
537 | int result = 0; | |
538 | acpi_status status = AE_OK; | |
539 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
540 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
541 | struct acpi_buffer state = {0, NULL}; | |
542 | union acpi_object *psd = NULL; | |
543 | struct acpi_psd_package *pdomain; | |
544 | ||
3b2d9942 VP |
545 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
546 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 547 | return -ENODEV; |
3b2d9942 VP |
548 | } |
549 | ||
50dd0969 | 550 | psd = buffer.pointer; |
3b2d9942 VP |
551 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
552 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
553 | result = -EFAULT; | |
554 | goto end; | |
555 | } | |
556 | ||
557 | if (psd->package.count != 1) { | |
558 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
559 | result = -EFAULT; | |
560 | goto end; | |
561 | } | |
562 | ||
563 | pdomain = &(pr->performance->domain_info); | |
564 | ||
565 | state.length = sizeof(struct acpi_psd_package); | |
566 | state.pointer = pdomain; | |
567 | ||
568 | status = acpi_extract_package(&(psd->package.elements[0]), | |
569 | &format, &state); | |
570 | if (ACPI_FAILURE(status)) { | |
571 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
572 | result = -EFAULT; | |
573 | goto end; | |
574 | } | |
575 | ||
576 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
577 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n")); | |
578 | result = -EFAULT; | |
579 | goto end; | |
580 | } | |
581 | ||
582 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
583 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n")); | |
584 | result = -EFAULT; | |
585 | goto end; | |
586 | } | |
587 | ||
588 | end: | |
02438d87 | 589 | kfree(buffer.pointer); |
9011bff4 | 590 | return result; |
3b2d9942 VP |
591 | } |
592 | ||
593 | int acpi_processor_preregister_performance( | |
594 | struct acpi_processor_performance **performance) | |
595 | { | |
596 | int count, count_target; | |
597 | int retval = 0; | |
598 | unsigned int i, j; | |
599 | cpumask_t covered_cpus; | |
600 | struct acpi_processor *pr; | |
601 | struct acpi_psd_package *pdomain; | |
602 | struct acpi_processor *match_pr; | |
603 | struct acpi_psd_package *match_pdomain; | |
604 | ||
785fcccd | 605 | mutex_lock(&performance_mutex); |
3b2d9942 VP |
606 | |
607 | retval = 0; | |
608 | ||
609 | /* Call _PSD for all CPUs */ | |
193de0c7 | 610 | for_each_possible_cpu(i) { |
3b2d9942 VP |
611 | pr = processors[i]; |
612 | if (!pr) { | |
613 | /* Look only at processors in ACPI namespace */ | |
614 | continue; | |
615 | } | |
616 | ||
617 | if (pr->performance) { | |
618 | retval = -EBUSY; | |
619 | continue; | |
620 | } | |
621 | ||
622 | if (!performance || !performance[i]) { | |
623 | retval = -EINVAL; | |
624 | continue; | |
625 | } | |
626 | ||
627 | pr->performance = performance[i]; | |
628 | cpu_set(i, pr->performance->shared_cpu_map); | |
629 | if (acpi_processor_get_psd(pr)) { | |
630 | retval = -EINVAL; | |
631 | continue; | |
632 | } | |
633 | } | |
634 | if (retval) | |
635 | goto err_ret; | |
636 | ||
637 | /* | |
638 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
639 | * domain info. | |
640 | */ | |
193de0c7 | 641 | for_each_possible_cpu(i) { |
3b2d9942 VP |
642 | pr = processors[i]; |
643 | if (!pr) | |
644 | continue; | |
645 | ||
646 | /* Basic validity check for domain info */ | |
647 | pdomain = &(pr->performance->domain_info); | |
648 | if ((pdomain->revision != ACPI_PSD_REV0_REVISION) || | |
649 | (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) { | |
650 | retval = -EINVAL; | |
651 | goto err_ret; | |
652 | } | |
653 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
654 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
655 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
656 | retval = -EINVAL; | |
657 | goto err_ret; | |
658 | } | |
659 | } | |
660 | ||
661 | cpus_clear(covered_cpus); | |
193de0c7 | 662 | for_each_possible_cpu(i) { |
3b2d9942 VP |
663 | pr = processors[i]; |
664 | if (!pr) | |
665 | continue; | |
666 | ||
667 | if (cpu_isset(i, covered_cpus)) | |
668 | continue; | |
669 | ||
670 | pdomain = &(pr->performance->domain_info); | |
671 | cpu_set(i, pr->performance->shared_cpu_map); | |
672 | cpu_set(i, covered_cpus); | |
673 | if (pdomain->num_processors <= 1) | |
674 | continue; | |
675 | ||
676 | /* Validate the Domain info */ | |
677 | count_target = pdomain->num_processors; | |
678 | count = 1; | |
46f18e3a | 679 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 680 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
681 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
682 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
683 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 684 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 685 | |
193de0c7 | 686 | for_each_possible_cpu(j) { |
3b2d9942 VP |
687 | if (i == j) |
688 | continue; | |
689 | ||
690 | match_pr = processors[j]; | |
691 | if (!match_pr) | |
692 | continue; | |
693 | ||
694 | match_pdomain = &(match_pr->performance->domain_info); | |
695 | if (match_pdomain->domain != pdomain->domain) | |
696 | continue; | |
697 | ||
698 | /* Here i and j are in the same domain */ | |
699 | ||
700 | if (match_pdomain->num_processors != count_target) { | |
701 | retval = -EINVAL; | |
702 | goto err_ret; | |
703 | } | |
704 | ||
705 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
706 | retval = -EINVAL; | |
707 | goto err_ret; | |
708 | } | |
709 | ||
710 | cpu_set(j, covered_cpus); | |
711 | cpu_set(j, pr->performance->shared_cpu_map); | |
712 | count++; | |
713 | } | |
714 | ||
193de0c7 | 715 | for_each_possible_cpu(j) { |
3b2d9942 VP |
716 | if (i == j) |
717 | continue; | |
718 | ||
719 | match_pr = processors[j]; | |
720 | if (!match_pr) | |
721 | continue; | |
722 | ||
723 | match_pdomain = &(match_pr->performance->domain_info); | |
724 | if (match_pdomain->domain != pdomain->domain) | |
725 | continue; | |
726 | ||
727 | match_pr->performance->shared_type = | |
728 | pr->performance->shared_type; | |
729 | match_pr->performance->shared_cpu_map = | |
730 | pr->performance->shared_cpu_map; | |
731 | } | |
732 | } | |
733 | ||
734 | err_ret: | |
193de0c7 | 735 | for_each_possible_cpu(i) { |
3b2d9942 VP |
736 | pr = processors[i]; |
737 | if (!pr || !pr->performance) | |
738 | continue; | |
739 | ||
740 | /* Assume no coordination on any error parsing domain info */ | |
741 | if (retval) { | |
742 | cpus_clear(pr->performance->shared_cpu_map); | |
743 | cpu_set(i, pr->performance->shared_cpu_map); | |
744 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; | |
745 | } | |
746 | pr->performance = NULL; /* Will be set for real in register */ | |
747 | } | |
748 | ||
785fcccd | 749 | mutex_unlock(&performance_mutex); |
9011bff4 | 750 | return retval; |
3b2d9942 VP |
751 | } |
752 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
753 | ||
754 | ||
1da177e4 | 755 | int |
4be44fcd LB |
756 | acpi_processor_register_performance(struct acpi_processor_performance |
757 | *performance, unsigned int cpu) | |
1da177e4 LT |
758 | { |
759 | struct acpi_processor *pr; | |
760 | ||
1da177e4 LT |
761 | |
762 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 763 | return -EINVAL; |
1da177e4 | 764 | |
65c19bbd | 765 | mutex_lock(&performance_mutex); |
1da177e4 LT |
766 | |
767 | pr = processors[cpu]; | |
768 | if (!pr) { | |
65c19bbd | 769 | mutex_unlock(&performance_mutex); |
d550d98d | 770 | return -ENODEV; |
1da177e4 LT |
771 | } |
772 | ||
773 | if (pr->performance) { | |
65c19bbd | 774 | mutex_unlock(&performance_mutex); |
d550d98d | 775 | return -EBUSY; |
1da177e4 LT |
776 | } |
777 | ||
a913f507 AM |
778 | WARN_ON(!performance); |
779 | ||
1da177e4 LT |
780 | pr->performance = performance; |
781 | ||
782 | if (acpi_processor_get_performance_info(pr)) { | |
783 | pr->performance = NULL; | |
65c19bbd | 784 | mutex_unlock(&performance_mutex); |
d550d98d | 785 | return -EIO; |
1da177e4 LT |
786 | } |
787 | ||
788 | acpi_cpufreq_add_file(pr); | |
789 | ||
65c19bbd | 790 | mutex_unlock(&performance_mutex); |
d550d98d | 791 | return 0; |
1da177e4 | 792 | } |
1da177e4 | 793 | |
4be44fcd | 794 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
795 | |
796 | void | |
4be44fcd LB |
797 | acpi_processor_unregister_performance(struct acpi_processor_performance |
798 | *performance, unsigned int cpu) | |
1da177e4 LT |
799 | { |
800 | struct acpi_processor *pr; | |
801 | ||
1da177e4 | 802 | |
65c19bbd | 803 | mutex_lock(&performance_mutex); |
1da177e4 LT |
804 | |
805 | pr = processors[cpu]; | |
806 | if (!pr) { | |
65c19bbd | 807 | mutex_unlock(&performance_mutex); |
d550d98d | 808 | return; |
1da177e4 LT |
809 | } |
810 | ||
a913f507 AM |
811 | if (pr->performance) |
812 | kfree(pr->performance->states); | |
1da177e4 LT |
813 | pr->performance = NULL; |
814 | ||
815 | acpi_cpufreq_remove_file(pr); | |
816 | ||
65c19bbd | 817 | mutex_unlock(&performance_mutex); |
1da177e4 | 818 | |
d550d98d | 819 | return; |
1da177e4 | 820 | } |
4be44fcd | 821 | |
1da177e4 | 822 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |