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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 | ||
a1531acd TR |
67 | /* ignore_ppc: |
68 | * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet | |
69 | * ignore _PPC | |
70 | * 0 -> cpufreq low level drivers initialized -> consider _PPC values | |
71 | * 1 -> ignore _PPC totally -> forced by user through boot param | |
72 | */ | |
9f497bcc | 73 | static int ignore_ppc = -1; |
623b78c3 TR |
74 | module_param(ignore_ppc, uint, 0644); |
75 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ | |
76 | "limited by BIOS, this should help"); | |
77 | ||
1da177e4 LT |
78 | #define PPC_REGISTERED 1 |
79 | #define PPC_IN_USE 2 | |
80 | ||
a1531acd | 81 | static int acpi_processor_ppc_status; |
1da177e4 LT |
82 | |
83 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 84 | unsigned long event, void *data) |
1da177e4 LT |
85 | { |
86 | struct cpufreq_policy *policy = data; | |
87 | struct acpi_processor *pr; | |
88 | unsigned int ppc = 0; | |
89 | ||
a1531acd TR |
90 | if (event == CPUFREQ_START && ignore_ppc <= 0) { |
91 | ignore_ppc = 0; | |
92 | return 0; | |
93 | } | |
94 | ||
623b78c3 TR |
95 | if (ignore_ppc) |
96 | return 0; | |
97 | ||
1da177e4 | 98 | if (event != CPUFREQ_INCOMPATIBLE) |
9b67c5d4 TR |
99 | return 0; |
100 | ||
101 | mutex_lock(&performance_mutex); | |
1da177e4 | 102 | |
706546d0 | 103 | pr = per_cpu(processors, policy->cpu); |
1da177e4 LT |
104 | if (!pr || !pr->performance) |
105 | goto out; | |
106 | ||
4be44fcd | 107 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 108 | |
0916bd3e | 109 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
110 | goto out; |
111 | ||
112 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
113 | pr->performance->states[ppc]. |
114 | core_frequency * 1000); | |
1da177e4 | 115 | |
4be44fcd | 116 | out: |
65c19bbd | 117 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
118 | |
119 | return 0; | |
120 | } | |
121 | ||
1da177e4 LT |
122 | static struct notifier_block acpi_ppc_notifier_block = { |
123 | .notifier_call = acpi_processor_ppc_notifier, | |
124 | }; | |
125 | ||
4be44fcd | 126 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 127 | { |
4be44fcd LB |
128 | acpi_status status = 0; |
129 | unsigned long ppc = 0; | |
1da177e4 | 130 | |
1da177e4 LT |
131 | |
132 | if (!pr) | |
d550d98d | 133 | return -EINVAL; |
1da177e4 LT |
134 | |
135 | /* | |
136 | * _PPC indicates the maximum state currently supported by the platform | |
137 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
138 | */ | |
139 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
140 | ||
141 | if (status != AE_NOT_FOUND) | |
142 | acpi_processor_ppc_status |= PPC_IN_USE; | |
143 | ||
4be44fcd | 144 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 145 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 146 | return -ENODEV; |
1da177e4 LT |
147 | } |
148 | ||
919158d1 TR |
149 | cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
150 | (int)ppc, ppc ? "" : "not"); | |
151 | ||
4be44fcd | 152 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 153 | |
d550d98d | 154 | return 0; |
1da177e4 LT |
155 | } |
156 | ||
4be44fcd | 157 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr) |
1da177e4 | 158 | { |
623b78c3 TR |
159 | int ret; |
160 | ||
161 | if (ignore_ppc) | |
162 | return 0; | |
163 | ||
164 | ret = acpi_processor_get_platform_limit(pr); | |
165 | ||
1da177e4 LT |
166 | if (ret < 0) |
167 | return (ret); | |
168 | else | |
169 | return cpufreq_update_policy(pr->id); | |
170 | } | |
171 | ||
4be44fcd LB |
172 | void acpi_processor_ppc_init(void) |
173 | { | |
174 | if (!cpufreq_register_notifier | |
175 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
176 | acpi_processor_ppc_status |= PPC_REGISTERED; |
177 | else | |
4be44fcd LB |
178 | printk(KERN_DEBUG |
179 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
180 | } |
181 | ||
4be44fcd LB |
182 | void acpi_processor_ppc_exit(void) |
183 | { | |
1da177e4 | 184 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
185 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
186 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
187 | |
188 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
189 | } | |
190 | ||
4be44fcd | 191 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 192 | { |
4be44fcd LB |
193 | int result = 0; |
194 | acpi_status status = 0; | |
195 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
196 | union acpi_object *pct = NULL; | |
197 | union acpi_object obj = { 0 }; | |
1da177e4 | 198 | |
1da177e4 LT |
199 | |
200 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 201 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 202 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 203 | return -ENODEV; |
1da177e4 LT |
204 | } |
205 | ||
4be44fcd | 206 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 207 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 208 | || (pct->package.count != 2)) { |
6468463a | 209 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
210 | result = -EFAULT; |
211 | goto end; | |
212 | } | |
213 | ||
214 | /* | |
215 | * control_register | |
216 | */ | |
217 | ||
218 | obj = pct->package.elements[0]; | |
219 | ||
220 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
221 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
222 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 223 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
224 | result = -EFAULT; |
225 | goto end; | |
226 | } | |
4be44fcd LB |
227 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
228 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
229 | |
230 | /* | |
231 | * status_register | |
232 | */ | |
233 | ||
234 | obj = pct->package.elements[1]; | |
235 | ||
236 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
237 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
238 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 239 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
240 | result = -EFAULT; |
241 | goto end; | |
242 | } | |
243 | ||
4be44fcd LB |
244 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
245 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 246 | |
4be44fcd | 247 | end: |
02438d87 | 248 | kfree(buffer.pointer); |
1da177e4 | 249 | |
d550d98d | 250 | return result; |
1da177e4 LT |
251 | } |
252 | ||
4be44fcd | 253 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 254 | { |
4be44fcd LB |
255 | int result = 0; |
256 | acpi_status status = AE_OK; | |
257 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
258 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
259 | struct acpi_buffer state = { 0, NULL }; | |
260 | union acpi_object *pss = NULL; | |
261 | int i; | |
1da177e4 | 262 | |
1da177e4 LT |
263 | |
264 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 265 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 266 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 267 | return -ENODEV; |
1da177e4 LT |
268 | } |
269 | ||
50dd0969 | 270 | pss = buffer.pointer; |
1da177e4 | 271 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 272 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
273 | result = -EFAULT; |
274 | goto end; | |
275 | } | |
276 | ||
277 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 278 | pss->package.count)); |
1da177e4 LT |
279 | |
280 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
281 | pr->performance->states = |
282 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
283 | GFP_KERNEL); | |
1da177e4 LT |
284 | if (!pr->performance->states) { |
285 | result = -ENOMEM; | |
286 | goto end; | |
287 | } | |
288 | ||
289 | for (i = 0; i < pr->performance->state_count; i++) { | |
290 | ||
291 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
292 | ||
293 | state.length = sizeof(struct acpi_processor_px); | |
294 | state.pointer = px; | |
295 | ||
296 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
297 | ||
298 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 299 | &format, &state); |
1da177e4 | 300 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 301 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
302 | result = -EFAULT; |
303 | kfree(pr->performance->states); | |
304 | goto end; | |
305 | } | |
306 | ||
307 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
308 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
309 | i, | |
310 | (u32) px->core_frequency, | |
311 | (u32) px->power, | |
312 | (u32) px->transition_latency, | |
313 | (u32) px->bus_master_latency, | |
314 | (u32) px->control, (u32) px->status)); | |
1da177e4 LT |
315 | |
316 | if (!px->core_frequency) { | |
6468463a LB |
317 | printk(KERN_ERR PREFIX |
318 | "Invalid _PSS data: freq is zero\n"); | |
1da177e4 LT |
319 | result = -EFAULT; |
320 | kfree(pr->performance->states); | |
321 | goto end; | |
322 | } | |
323 | } | |
324 | ||
4be44fcd | 325 | end: |
02438d87 | 326 | kfree(buffer.pointer); |
1da177e4 | 327 | |
d550d98d | 328 | return result; |
1da177e4 LT |
329 | } |
330 | ||
4be44fcd | 331 | static int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 332 | { |
4be44fcd LB |
333 | int result = 0; |
334 | acpi_status status = AE_OK; | |
335 | acpi_handle handle = NULL; | |
1da177e4 | 336 | |
1da177e4 LT |
337 | |
338 | if (!pr || !pr->performance || !pr->handle) | |
d550d98d | 339 | return -EINVAL; |
1da177e4 | 340 | |
1da177e4 LT |
341 | status = acpi_get_handle(pr->handle, "_PCT", &handle); |
342 | if (ACPI_FAILURE(status)) { | |
343 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 344 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 345 | return -ENODEV; |
1da177e4 LT |
346 | } |
347 | ||
348 | result = acpi_processor_get_performance_control(pr); | |
349 | if (result) | |
d550d98d | 350 | return result; |
1da177e4 LT |
351 | |
352 | result = acpi_processor_get_performance_states(pr); | |
353 | if (result) | |
d550d98d | 354 | return result; |
1da177e4 | 355 | |
d550d98d | 356 | return 0; |
1da177e4 LT |
357 | } |
358 | ||
4be44fcd LB |
359 | int acpi_processor_notify_smm(struct module *calling_module) |
360 | { | |
361 | acpi_status status; | |
362 | static int is_done = 0; | |
1da177e4 | 363 | |
1da177e4 LT |
364 | |
365 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 366 | return -EBUSY; |
1da177e4 LT |
367 | |
368 | if (!try_module_get(calling_module)) | |
d550d98d | 369 | return -EINVAL; |
1da177e4 LT |
370 | |
371 | /* is_done is set to negative if an error occured, | |
372 | * and to postitive if _no_ error occured, but SMM | |
373 | * was already notified. This avoids double notification | |
374 | * which might lead to unexpected results... | |
375 | */ | |
376 | if (is_done > 0) { | |
377 | module_put(calling_module); | |
d550d98d | 378 | return 0; |
4be44fcd | 379 | } else if (is_done < 0) { |
1da177e4 | 380 | module_put(calling_module); |
d550d98d | 381 | return is_done; |
1da177e4 LT |
382 | } |
383 | ||
384 | is_done = -EIO; | |
385 | ||
ad71860a | 386 | /* Can't write pstate_control to smi_command if either value is zero */ |
cee324b1 | 387 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
ad71860a | 388 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 389 | module_put(calling_module); |
d550d98d | 390 | return 0; |
1da177e4 LT |
391 | } |
392 | ||
4be44fcd | 393 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a | 394 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
cee324b1 | 395 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
1da177e4 | 396 | |
cee324b1 AS |
397 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
398 | (u32) acpi_gbl_FADT.pstate_control, 8); | |
4be44fcd | 399 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 400 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a | 401 | "Failed to write pstate_control [0x%x] to " |
cee324b1 AS |
402 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
403 | acpi_gbl_FADT.smi_command)); | |
1da177e4 | 404 | module_put(calling_module); |
d550d98d | 405 | return status; |
1da177e4 LT |
406 | } |
407 | ||
408 | /* Success. If there's no _PPC, we need to fear nothing, so | |
409 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
410 | is_done = 1; | |
411 | ||
412 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
413 | module_put(calling_module); | |
414 | ||
d550d98d | 415 | return 0; |
1da177e4 | 416 | } |
1da177e4 | 417 | |
4be44fcd | 418 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 LT |
419 | |
420 | #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF | |
421 | /* /proc/acpi/processor/../performance interface (DEPRECATED) */ | |
422 | ||
423 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file); | |
424 | static struct file_operations acpi_processor_perf_fops = { | |
cf7acfab | 425 | .owner = THIS_MODULE, |
4be44fcd LB |
426 | .open = acpi_processor_perf_open_fs, |
427 | .read = seq_read, | |
428 | .llseek = seq_lseek, | |
429 | .release = single_release, | |
1da177e4 LT |
430 | }; |
431 | ||
432 | static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset) | |
433 | { | |
50dd0969 | 434 | struct acpi_processor *pr = seq->private; |
4be44fcd | 435 | int i; |
1da177e4 | 436 | |
1da177e4 LT |
437 | |
438 | if (!pr) | |
439 | goto end; | |
440 | ||
441 | if (!pr->performance) { | |
442 | seq_puts(seq, "<not supported>\n"); | |
443 | goto end; | |
444 | } | |
445 | ||
446 | seq_printf(seq, "state count: %d\n" | |
4be44fcd LB |
447 | "active state: P%d\n", |
448 | pr->performance->state_count, pr->performance->state); | |
1da177e4 LT |
449 | |
450 | seq_puts(seq, "states:\n"); | |
451 | for (i = 0; i < pr->performance->state_count; i++) | |
4be44fcd LB |
452 | seq_printf(seq, |
453 | " %cP%d: %d MHz, %d mW, %d uS\n", | |
454 | (i == pr->performance->state ? '*' : ' '), i, | |
455 | (u32) pr->performance->states[i].core_frequency, | |
456 | (u32) pr->performance->states[i].power, | |
457 | (u32) pr->performance->states[i].transition_latency); | |
458 | ||
459 | end: | |
d550d98d | 460 | return 0; |
1da177e4 LT |
461 | } |
462 | ||
463 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file) | |
464 | { | |
465 | return single_open(file, acpi_processor_perf_seq_show, | |
4be44fcd | 466 | PDE(inode)->data); |
1da177e4 LT |
467 | } |
468 | ||
4be44fcd | 469 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
1da177e4 | 470 | { |
4be44fcd | 471 | struct acpi_device *device = NULL; |
1da177e4 | 472 | |
1da177e4 LT |
473 | |
474 | if (acpi_bus_get_device(pr->handle, &device)) | |
d550d98d | 475 | return; |
1da177e4 LT |
476 | |
477 | /* add file 'performance' [R/W] */ | |
cf7acfab DL |
478 | proc_create_data(ACPI_PROCESSOR_FILE_PERFORMANCE, S_IFREG | S_IRUGO, |
479 | acpi_device_dir(device), | |
480 | &acpi_processor_perf_fops, acpi_driver_data(device)); | |
d550d98d | 481 | return; |
1da177e4 LT |
482 | } |
483 | ||
4be44fcd | 484 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) |
1da177e4 | 485 | { |
4be44fcd | 486 | struct acpi_device *device = NULL; |
1da177e4 | 487 | |
1da177e4 LT |
488 | |
489 | if (acpi_bus_get_device(pr->handle, &device)) | |
d550d98d | 490 | return; |
1da177e4 LT |
491 | |
492 | /* remove file 'performance' */ | |
493 | remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, | |
4be44fcd | 494 | acpi_device_dir(device)); |
1da177e4 | 495 | |
d550d98d | 496 | return; |
1da177e4 LT |
497 | } |
498 | ||
499 | #else | |
4be44fcd LB |
500 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
501 | { | |
502 | return; | |
503 | } | |
504 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) | |
505 | { | |
506 | return; | |
507 | } | |
508 | #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */ | |
1da177e4 | 509 | |
3b2d9942 VP |
510 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
511 | { | |
512 | int result = 0; | |
513 | acpi_status status = AE_OK; | |
514 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
515 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
516 | struct acpi_buffer state = {0, NULL}; | |
517 | union acpi_object *psd = NULL; | |
518 | struct acpi_psd_package *pdomain; | |
519 | ||
3b2d9942 VP |
520 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
521 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 522 | return -ENODEV; |
3b2d9942 VP |
523 | } |
524 | ||
50dd0969 | 525 | psd = buffer.pointer; |
3b2d9942 VP |
526 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
527 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
528 | result = -EFAULT; | |
529 | goto end; | |
530 | } | |
531 | ||
532 | if (psd->package.count != 1) { | |
533 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
534 | result = -EFAULT; | |
535 | goto end; | |
536 | } | |
537 | ||
538 | pdomain = &(pr->performance->domain_info); | |
539 | ||
540 | state.length = sizeof(struct acpi_psd_package); | |
541 | state.pointer = pdomain; | |
542 | ||
543 | status = acpi_extract_package(&(psd->package.elements[0]), | |
544 | &format, &state); | |
545 | if (ACPI_FAILURE(status)) { | |
546 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); | |
547 | result = -EFAULT; | |
548 | goto end; | |
549 | } | |
550 | ||
551 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
552 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n")); | |
553 | result = -EFAULT; | |
554 | goto end; | |
555 | } | |
556 | ||
557 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
558 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n")); | |
559 | result = -EFAULT; | |
560 | goto end; | |
561 | } | |
562 | ||
563 | end: | |
02438d87 | 564 | kfree(buffer.pointer); |
9011bff4 | 565 | return result; |
3b2d9942 VP |
566 | } |
567 | ||
568 | int acpi_processor_preregister_performance( | |
50109292 | 569 | struct acpi_processor_performance *performance) |
3b2d9942 VP |
570 | { |
571 | int count, count_target; | |
572 | int retval = 0; | |
573 | unsigned int i, j; | |
574 | cpumask_t covered_cpus; | |
575 | struct acpi_processor *pr; | |
576 | struct acpi_psd_package *pdomain; | |
577 | struct acpi_processor *match_pr; | |
578 | struct acpi_psd_package *match_pdomain; | |
579 | ||
785fcccd | 580 | mutex_lock(&performance_mutex); |
3b2d9942 VP |
581 | |
582 | retval = 0; | |
583 | ||
584 | /* Call _PSD for all CPUs */ | |
193de0c7 | 585 | for_each_possible_cpu(i) { |
706546d0 | 586 | pr = per_cpu(processors, i); |
3b2d9942 VP |
587 | if (!pr) { |
588 | /* Look only at processors in ACPI namespace */ | |
589 | continue; | |
590 | } | |
591 | ||
592 | if (pr->performance) { | |
593 | retval = -EBUSY; | |
594 | continue; | |
595 | } | |
596 | ||
50109292 | 597 | if (!performance || !percpu_ptr(performance, i)) { |
3b2d9942 VP |
598 | retval = -EINVAL; |
599 | continue; | |
600 | } | |
601 | ||
50109292 | 602 | pr->performance = percpu_ptr(performance, i); |
3b2d9942 VP |
603 | cpu_set(i, pr->performance->shared_cpu_map); |
604 | if (acpi_processor_get_psd(pr)) { | |
605 | retval = -EINVAL; | |
606 | continue; | |
607 | } | |
608 | } | |
609 | if (retval) | |
610 | goto err_ret; | |
611 | ||
612 | /* | |
613 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
614 | * domain info. | |
615 | */ | |
193de0c7 | 616 | for_each_possible_cpu(i) { |
706546d0 | 617 | pr = per_cpu(processors, i); |
3b2d9942 VP |
618 | if (!pr) |
619 | continue; | |
620 | ||
621 | /* Basic validity check for domain info */ | |
622 | pdomain = &(pr->performance->domain_info); | |
623 | if ((pdomain->revision != ACPI_PSD_REV0_REVISION) || | |
624 | (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) { | |
625 | retval = -EINVAL; | |
626 | goto err_ret; | |
627 | } | |
628 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
629 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
630 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
631 | retval = -EINVAL; | |
632 | goto err_ret; | |
633 | } | |
634 | } | |
635 | ||
636 | cpus_clear(covered_cpus); | |
193de0c7 | 637 | for_each_possible_cpu(i) { |
706546d0 | 638 | pr = per_cpu(processors, i); |
3b2d9942 VP |
639 | if (!pr) |
640 | continue; | |
641 | ||
642 | if (cpu_isset(i, covered_cpus)) | |
643 | continue; | |
644 | ||
645 | pdomain = &(pr->performance->domain_info); | |
646 | cpu_set(i, pr->performance->shared_cpu_map); | |
647 | cpu_set(i, covered_cpus); | |
648 | if (pdomain->num_processors <= 1) | |
649 | continue; | |
650 | ||
651 | /* Validate the Domain info */ | |
652 | count_target = pdomain->num_processors; | |
653 | count = 1; | |
46f18e3a | 654 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 655 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
656 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
657 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
658 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 659 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 660 | |
193de0c7 | 661 | for_each_possible_cpu(j) { |
3b2d9942 VP |
662 | if (i == j) |
663 | continue; | |
664 | ||
706546d0 | 665 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
666 | if (!match_pr) |
667 | continue; | |
668 | ||
669 | match_pdomain = &(match_pr->performance->domain_info); | |
670 | if (match_pdomain->domain != pdomain->domain) | |
671 | continue; | |
672 | ||
673 | /* Here i and j are in the same domain */ | |
674 | ||
675 | if (match_pdomain->num_processors != count_target) { | |
676 | retval = -EINVAL; | |
677 | goto err_ret; | |
678 | } | |
679 | ||
680 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
681 | retval = -EINVAL; | |
682 | goto err_ret; | |
683 | } | |
684 | ||
685 | cpu_set(j, covered_cpus); | |
686 | cpu_set(j, pr->performance->shared_cpu_map); | |
687 | count++; | |
688 | } | |
689 | ||
193de0c7 | 690 | for_each_possible_cpu(j) { |
3b2d9942 VP |
691 | if (i == j) |
692 | continue; | |
693 | ||
706546d0 | 694 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
695 | if (!match_pr) |
696 | continue; | |
697 | ||
698 | match_pdomain = &(match_pr->performance->domain_info); | |
699 | if (match_pdomain->domain != pdomain->domain) | |
700 | continue; | |
701 | ||
702 | match_pr->performance->shared_type = | |
703 | pr->performance->shared_type; | |
704 | match_pr->performance->shared_cpu_map = | |
705 | pr->performance->shared_cpu_map; | |
706 | } | |
707 | } | |
708 | ||
709 | err_ret: | |
193de0c7 | 710 | for_each_possible_cpu(i) { |
706546d0 | 711 | pr = per_cpu(processors, i); |
3b2d9942 VP |
712 | if (!pr || !pr->performance) |
713 | continue; | |
714 | ||
715 | /* Assume no coordination on any error parsing domain info */ | |
716 | if (retval) { | |
717 | cpus_clear(pr->performance->shared_cpu_map); | |
718 | cpu_set(i, pr->performance->shared_cpu_map); | |
719 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; | |
720 | } | |
721 | pr->performance = NULL; /* Will be set for real in register */ | |
722 | } | |
723 | ||
785fcccd | 724 | mutex_unlock(&performance_mutex); |
9011bff4 | 725 | return retval; |
3b2d9942 VP |
726 | } |
727 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
728 | ||
729 | ||
1da177e4 | 730 | int |
4be44fcd LB |
731 | acpi_processor_register_performance(struct acpi_processor_performance |
732 | *performance, unsigned int cpu) | |
1da177e4 LT |
733 | { |
734 | struct acpi_processor *pr; | |
735 | ||
1da177e4 LT |
736 | |
737 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 738 | return -EINVAL; |
1da177e4 | 739 | |
65c19bbd | 740 | mutex_lock(&performance_mutex); |
1da177e4 | 741 | |
706546d0 | 742 | pr = per_cpu(processors, cpu); |
1da177e4 | 743 | if (!pr) { |
65c19bbd | 744 | mutex_unlock(&performance_mutex); |
d550d98d | 745 | return -ENODEV; |
1da177e4 LT |
746 | } |
747 | ||
748 | if (pr->performance) { | |
65c19bbd | 749 | mutex_unlock(&performance_mutex); |
d550d98d | 750 | return -EBUSY; |
1da177e4 LT |
751 | } |
752 | ||
a913f507 AM |
753 | WARN_ON(!performance); |
754 | ||
1da177e4 LT |
755 | pr->performance = performance; |
756 | ||
757 | if (acpi_processor_get_performance_info(pr)) { | |
758 | pr->performance = NULL; | |
65c19bbd | 759 | mutex_unlock(&performance_mutex); |
d550d98d | 760 | return -EIO; |
1da177e4 LT |
761 | } |
762 | ||
763 | acpi_cpufreq_add_file(pr); | |
764 | ||
65c19bbd | 765 | mutex_unlock(&performance_mutex); |
d550d98d | 766 | return 0; |
1da177e4 | 767 | } |
1da177e4 | 768 | |
4be44fcd | 769 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
770 | |
771 | void | |
4be44fcd LB |
772 | acpi_processor_unregister_performance(struct acpi_processor_performance |
773 | *performance, unsigned int cpu) | |
1da177e4 LT |
774 | { |
775 | struct acpi_processor *pr; | |
776 | ||
1da177e4 | 777 | |
65c19bbd | 778 | mutex_lock(&performance_mutex); |
1da177e4 | 779 | |
706546d0 | 780 | pr = per_cpu(processors, cpu); |
1da177e4 | 781 | if (!pr) { |
65c19bbd | 782 | mutex_unlock(&performance_mutex); |
d550d98d | 783 | return; |
1da177e4 LT |
784 | } |
785 | ||
a913f507 AM |
786 | if (pr->performance) |
787 | kfree(pr->performance->states); | |
1da177e4 LT |
788 | pr->performance = NULL; |
789 | ||
790 | acpi_cpufreq_remove_file(pr); | |
791 | ||
65c19bbd | 792 | mutex_unlock(&performance_mutex); |
1da177e4 | 793 | |
d550d98d | 794 | return; |
1da177e4 | 795 | } |
4be44fcd | 796 | |
1da177e4 | 797 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |