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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 | |
16be87ea MX |
41 | |
42 | #ifdef CONFIG_X86 | |
910dfae2 | 43 | #include <asm/cpufeature.h> |
16be87ea | 44 | #endif |
1da177e4 LT |
45 | |
46 | #include <acpi/acpi_bus.h> | |
89595b8f | 47 | #include <acpi/acpi_drivers.h> |
1da177e4 LT |
48 | #include <acpi/processor.h> |
49 | ||
1da177e4 | 50 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 LT |
51 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
52 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
f52fd66d | 53 | ACPI_MODULE_NAME("processor_perflib"); |
1da177e4 | 54 | |
65c19bbd | 55 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 | 56 | |
919158d1 TR |
57 | /* Use cpufreq debug layer for _PPC changes. */ |
58 | #define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \ | |
59 | "cpufreq-core", msg) | |
60 | ||
1da177e4 LT |
61 | /* |
62 | * _PPC support is implemented as a CPUfreq policy notifier: | |
63 | * This means each time a CPUfreq driver registered also with | |
64 | * the ACPI core is asked to change the speed policy, the maximum | |
65 | * value is adjusted so that it is within the platform limit. | |
66 | * | |
67 | * Also, when a new platform limit value is detected, the CPUfreq | |
68 | * policy is adjusted accordingly. | |
69 | */ | |
70 | ||
a1531acd TR |
71 | /* ignore_ppc: |
72 | * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet | |
73 | * ignore _PPC | |
74 | * 0 -> cpufreq low level drivers initialized -> consider _PPC values | |
75 | * 1 -> ignore _PPC totally -> forced by user through boot param | |
76 | */ | |
9f497bcc | 77 | static int ignore_ppc = -1; |
613e5f33 | 78 | module_param(ignore_ppc, int, 0644); |
623b78c3 TR |
79 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
80 | "limited by BIOS, this should help"); | |
81 | ||
1da177e4 LT |
82 | #define PPC_REGISTERED 1 |
83 | #define PPC_IN_USE 2 | |
84 | ||
a1531acd | 85 | static int acpi_processor_ppc_status; |
1da177e4 LT |
86 | |
87 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 88 | unsigned long event, void *data) |
1da177e4 LT |
89 | { |
90 | struct cpufreq_policy *policy = data; | |
91 | struct acpi_processor *pr; | |
92 | unsigned int ppc = 0; | |
93 | ||
a1531acd TR |
94 | if (event == CPUFREQ_START && ignore_ppc <= 0) { |
95 | ignore_ppc = 0; | |
96 | return 0; | |
97 | } | |
98 | ||
623b78c3 TR |
99 | if (ignore_ppc) |
100 | return 0; | |
101 | ||
1da177e4 | 102 | if (event != CPUFREQ_INCOMPATIBLE) |
9b67c5d4 TR |
103 | return 0; |
104 | ||
105 | mutex_lock(&performance_mutex); | |
1da177e4 | 106 | |
706546d0 | 107 | pr = per_cpu(processors, policy->cpu); |
1da177e4 LT |
108 | if (!pr || !pr->performance) |
109 | goto out; | |
110 | ||
4be44fcd | 111 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 112 | |
0916bd3e | 113 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
114 | goto out; |
115 | ||
116 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
117 | pr->performance->states[ppc]. |
118 | core_frequency * 1000); | |
1da177e4 | 119 | |
4be44fcd | 120 | out: |
65c19bbd | 121 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
122 | |
123 | return 0; | |
124 | } | |
125 | ||
1da177e4 LT |
126 | static struct notifier_block acpi_ppc_notifier_block = { |
127 | .notifier_call = acpi_processor_ppc_notifier, | |
128 | }; | |
129 | ||
4be44fcd | 130 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 131 | { |
4be44fcd | 132 | acpi_status status = 0; |
27663c58 | 133 | unsigned long long ppc = 0; |
1da177e4 | 134 | |
1da177e4 LT |
135 | |
136 | if (!pr) | |
d550d98d | 137 | return -EINVAL; |
1da177e4 LT |
138 | |
139 | /* | |
140 | * _PPC indicates the maximum state currently supported by the platform | |
141 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
142 | */ | |
143 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
144 | ||
145 | if (status != AE_NOT_FOUND) | |
146 | acpi_processor_ppc_status |= PPC_IN_USE; | |
147 | ||
4be44fcd | 148 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 149 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 150 | return -ENODEV; |
1da177e4 LT |
151 | } |
152 | ||
919158d1 TR |
153 | cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
154 | (int)ppc, ppc ? "" : "not"); | |
155 | ||
4be44fcd | 156 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 157 | |
d550d98d | 158 | return 0; |
1da177e4 LT |
159 | } |
160 | ||
4be44fcd | 161 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr) |
1da177e4 | 162 | { |
623b78c3 TR |
163 | int ret; |
164 | ||
165 | if (ignore_ppc) | |
166 | return 0; | |
167 | ||
168 | ret = acpi_processor_get_platform_limit(pr); | |
169 | ||
1da177e4 LT |
170 | if (ret < 0) |
171 | return (ret); | |
172 | else | |
173 | return cpufreq_update_policy(pr->id); | |
174 | } | |
175 | ||
4be44fcd LB |
176 | void acpi_processor_ppc_init(void) |
177 | { | |
178 | if (!cpufreq_register_notifier | |
179 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
180 | acpi_processor_ppc_status |= PPC_REGISTERED; |
181 | else | |
4be44fcd LB |
182 | printk(KERN_DEBUG |
183 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
184 | } |
185 | ||
4be44fcd LB |
186 | void acpi_processor_ppc_exit(void) |
187 | { | |
1da177e4 | 188 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
189 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
190 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
191 | |
192 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
193 | } | |
194 | ||
4be44fcd | 195 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 196 | { |
4be44fcd LB |
197 | int result = 0; |
198 | acpi_status status = 0; | |
199 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
200 | union acpi_object *pct = NULL; | |
201 | union acpi_object obj = { 0 }; | |
1da177e4 | 202 | |
1da177e4 LT |
203 | |
204 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 205 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 206 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 207 | return -ENODEV; |
1da177e4 LT |
208 | } |
209 | ||
4be44fcd | 210 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 211 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 212 | || (pct->package.count != 2)) { |
6468463a | 213 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
214 | result = -EFAULT; |
215 | goto end; | |
216 | } | |
217 | ||
218 | /* | |
219 | * control_register | |
220 | */ | |
221 | ||
222 | obj = pct->package.elements[0]; | |
223 | ||
224 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
225 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
226 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 227 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
228 | result = -EFAULT; |
229 | goto end; | |
230 | } | |
4be44fcd LB |
231 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
232 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
233 | |
234 | /* | |
235 | * status_register | |
236 | */ | |
237 | ||
238 | obj = pct->package.elements[1]; | |
239 | ||
240 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
241 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
242 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 243 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
244 | result = -EFAULT; |
245 | goto end; | |
246 | } | |
247 | ||
4be44fcd LB |
248 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
249 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 250 | |
4be44fcd | 251 | end: |
02438d87 | 252 | kfree(buffer.pointer); |
1da177e4 | 253 | |
d550d98d | 254 | return result; |
1da177e4 LT |
255 | } |
256 | ||
4be44fcd | 257 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 258 | { |
4be44fcd LB |
259 | int result = 0; |
260 | acpi_status status = AE_OK; | |
261 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
262 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
263 | struct acpi_buffer state = { 0, NULL }; | |
264 | union acpi_object *pss = NULL; | |
265 | int i; | |
1da177e4 | 266 | |
1da177e4 LT |
267 | |
268 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 269 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 270 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 271 | return -ENODEV; |
1da177e4 LT |
272 | } |
273 | ||
50dd0969 | 274 | pss = buffer.pointer; |
1da177e4 | 275 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 276 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
277 | result = -EFAULT; |
278 | goto end; | |
279 | } | |
280 | ||
281 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 282 | pss->package.count)); |
1da177e4 LT |
283 | |
284 | pr->performance->state_count = pss->package.count; | |
4be44fcd LB |
285 | pr->performance->states = |
286 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, | |
287 | GFP_KERNEL); | |
1da177e4 LT |
288 | if (!pr->performance->states) { |
289 | result = -ENOMEM; | |
290 | goto end; | |
291 | } | |
292 | ||
293 | for (i = 0; i < pr->performance->state_count; i++) { | |
294 | ||
295 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
296 | ||
297 | state.length = sizeof(struct acpi_processor_px); | |
298 | state.pointer = px; | |
299 | ||
300 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
301 | ||
302 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 303 | &format, &state); |
1da177e4 | 304 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 305 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
306 | result = -EFAULT; |
307 | kfree(pr->performance->states); | |
308 | goto end; | |
309 | } | |
310 | ||
311 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
312 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
313 | i, | |
314 | (u32) px->core_frequency, | |
315 | (u32) px->power, | |
316 | (u32) px->transition_latency, | |
317 | (u32) px->bus_master_latency, | |
318 | (u32) px->control, (u32) px->status)); | |
1da177e4 LT |
319 | |
320 | if (!px->core_frequency) { | |
6468463a LB |
321 | printk(KERN_ERR PREFIX |
322 | "Invalid _PSS data: freq is zero\n"); | |
1da177e4 LT |
323 | result = -EFAULT; |
324 | kfree(pr->performance->states); | |
325 | goto end; | |
326 | } | |
327 | } | |
328 | ||
4be44fcd | 329 | end: |
02438d87 | 330 | kfree(buffer.pointer); |
1da177e4 | 331 | |
d550d98d | 332 | return result; |
1da177e4 LT |
333 | } |
334 | ||
4be44fcd | 335 | static int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 336 | { |
4be44fcd LB |
337 | int result = 0; |
338 | acpi_status status = AE_OK; | |
339 | acpi_handle handle = NULL; | |
1da177e4 | 340 | |
1da177e4 | 341 | if (!pr || !pr->performance || !pr->handle) |
d550d98d | 342 | return -EINVAL; |
1da177e4 | 343 | |
1da177e4 LT |
344 | status = acpi_get_handle(pr->handle, "_PCT", &handle); |
345 | if (ACPI_FAILURE(status)) { | |
346 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 347 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 348 | return -ENODEV; |
1da177e4 LT |
349 | } |
350 | ||
351 | result = acpi_processor_get_performance_control(pr); | |
352 | if (result) | |
910dfae2 | 353 | goto update_bios; |
1da177e4 LT |
354 | |
355 | result = acpi_processor_get_performance_states(pr); | |
356 | if (result) | |
910dfae2 | 357 | goto update_bios; |
1da177e4 | 358 | |
d550d98d | 359 | return 0; |
910dfae2 TR |
360 | |
361 | /* | |
362 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that | |
363 | * the BIOS is older than the CPU and does not know its frequencies | |
364 | */ | |
365 | update_bios: | |
16be87ea | 366 | #ifdef CONFIG_X86 |
910dfae2 TR |
367 | if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){ |
368 | if(boot_cpu_has(X86_FEATURE_EST)) | |
369 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " | |
370 | "frequency support\n"); | |
371 | } | |
16be87ea | 372 | #endif |
910dfae2 | 373 | return result; |
1da177e4 LT |
374 | } |
375 | ||
4be44fcd LB |
376 | int acpi_processor_notify_smm(struct module *calling_module) |
377 | { | |
378 | acpi_status status; | |
379 | static int is_done = 0; | |
1da177e4 | 380 | |
1da177e4 LT |
381 | |
382 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 383 | return -EBUSY; |
1da177e4 LT |
384 | |
385 | if (!try_module_get(calling_module)) | |
d550d98d | 386 | return -EINVAL; |
1da177e4 LT |
387 | |
388 | /* is_done is set to negative if an error occured, | |
389 | * and to postitive if _no_ error occured, but SMM | |
390 | * was already notified. This avoids double notification | |
391 | * which might lead to unexpected results... | |
392 | */ | |
393 | if (is_done > 0) { | |
394 | module_put(calling_module); | |
d550d98d | 395 | return 0; |
4be44fcd | 396 | } else if (is_done < 0) { |
1da177e4 | 397 | module_put(calling_module); |
d550d98d | 398 | return is_done; |
1da177e4 LT |
399 | } |
400 | ||
401 | is_done = -EIO; | |
402 | ||
ad71860a | 403 | /* Can't write pstate_control to smi_command if either value is zero */ |
cee324b1 | 404 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
ad71860a | 405 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 406 | module_put(calling_module); |
d550d98d | 407 | return 0; |
1da177e4 LT |
408 | } |
409 | ||
4be44fcd | 410 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ad71860a | 411 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
cee324b1 | 412 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
1da177e4 | 413 | |
cee324b1 AS |
414 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
415 | (u32) acpi_gbl_FADT.pstate_control, 8); | |
4be44fcd | 416 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 417 | ACPI_EXCEPTION((AE_INFO, status, |
ad71860a | 418 | "Failed to write pstate_control [0x%x] to " |
cee324b1 AS |
419 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
420 | acpi_gbl_FADT.smi_command)); | |
1da177e4 | 421 | module_put(calling_module); |
d550d98d | 422 | return status; |
1da177e4 LT |
423 | } |
424 | ||
425 | /* Success. If there's no _PPC, we need to fear nothing, so | |
426 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
427 | is_done = 1; | |
428 | ||
429 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
430 | module_put(calling_module); | |
431 | ||
d550d98d | 432 | return 0; |
1da177e4 | 433 | } |
1da177e4 | 434 | |
4be44fcd | 435 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 LT |
436 | |
437 | #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF | |
438 | /* /proc/acpi/processor/../performance interface (DEPRECATED) */ | |
439 | ||
440 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file); | |
441 | static struct file_operations acpi_processor_perf_fops = { | |
cf7acfab | 442 | .owner = THIS_MODULE, |
4be44fcd LB |
443 | .open = acpi_processor_perf_open_fs, |
444 | .read = seq_read, | |
445 | .llseek = seq_lseek, | |
446 | .release = single_release, | |
1da177e4 LT |
447 | }; |
448 | ||
449 | static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset) | |
450 | { | |
50dd0969 | 451 | struct acpi_processor *pr = seq->private; |
4be44fcd | 452 | int i; |
1da177e4 | 453 | |
1da177e4 LT |
454 | |
455 | if (!pr) | |
456 | goto end; | |
457 | ||
458 | if (!pr->performance) { | |
459 | seq_puts(seq, "<not supported>\n"); | |
460 | goto end; | |
461 | } | |
462 | ||
463 | seq_printf(seq, "state count: %d\n" | |
4be44fcd LB |
464 | "active state: P%d\n", |
465 | pr->performance->state_count, pr->performance->state); | |
1da177e4 LT |
466 | |
467 | seq_puts(seq, "states:\n"); | |
468 | for (i = 0; i < pr->performance->state_count; i++) | |
4be44fcd LB |
469 | seq_printf(seq, |
470 | " %cP%d: %d MHz, %d mW, %d uS\n", | |
471 | (i == pr->performance->state ? '*' : ' '), i, | |
472 | (u32) pr->performance->states[i].core_frequency, | |
473 | (u32) pr->performance->states[i].power, | |
474 | (u32) pr->performance->states[i].transition_latency); | |
475 | ||
476 | end: | |
d550d98d | 477 | return 0; |
1da177e4 LT |
478 | } |
479 | ||
480 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file) | |
481 | { | |
482 | return single_open(file, acpi_processor_perf_seq_show, | |
4be44fcd | 483 | PDE(inode)->data); |
1da177e4 LT |
484 | } |
485 | ||
4be44fcd | 486 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
1da177e4 | 487 | { |
4be44fcd | 488 | struct acpi_device *device = NULL; |
1da177e4 | 489 | |
1da177e4 LT |
490 | |
491 | if (acpi_bus_get_device(pr->handle, &device)) | |
d550d98d | 492 | return; |
1da177e4 LT |
493 | |
494 | /* add file 'performance' [R/W] */ | |
cf7acfab DL |
495 | proc_create_data(ACPI_PROCESSOR_FILE_PERFORMANCE, S_IFREG | S_IRUGO, |
496 | acpi_device_dir(device), | |
497 | &acpi_processor_perf_fops, acpi_driver_data(device)); | |
d550d98d | 498 | return; |
1da177e4 LT |
499 | } |
500 | ||
4be44fcd | 501 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) |
1da177e4 | 502 | { |
4be44fcd | 503 | struct acpi_device *device = NULL; |
1da177e4 | 504 | |
1da177e4 LT |
505 | |
506 | if (acpi_bus_get_device(pr->handle, &device)) | |
d550d98d | 507 | return; |
1da177e4 LT |
508 | |
509 | /* remove file 'performance' */ | |
510 | remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, | |
4be44fcd | 511 | acpi_device_dir(device)); |
1da177e4 | 512 | |
d550d98d | 513 | return; |
1da177e4 LT |
514 | } |
515 | ||
516 | #else | |
4be44fcd LB |
517 | static void acpi_cpufreq_add_file(struct acpi_processor *pr) |
518 | { | |
519 | return; | |
520 | } | |
521 | static void acpi_cpufreq_remove_file(struct acpi_processor *pr) | |
522 | { | |
523 | return; | |
524 | } | |
525 | #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */ | |
1da177e4 | 526 | |
3b2d9942 VP |
527 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
528 | { | |
529 | int result = 0; | |
530 | acpi_status status = AE_OK; | |
531 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
532 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
533 | struct acpi_buffer state = {0, NULL}; | |
534 | union acpi_object *psd = NULL; | |
535 | struct acpi_psd_package *pdomain; | |
536 | ||
3b2d9942 VP |
537 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
538 | if (ACPI_FAILURE(status)) { | |
9011bff4 | 539 | return -ENODEV; |
3b2d9942 VP |
540 | } |
541 | ||
50dd0969 | 542 | psd = buffer.pointer; |
3b2d9942 | 543 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
55ac9a01 | 544 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
545 | result = -EFAULT; |
546 | goto end; | |
547 | } | |
548 | ||
549 | if (psd->package.count != 1) { | |
55ac9a01 | 550 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
551 | result = -EFAULT; |
552 | goto end; | |
553 | } | |
554 | ||
555 | pdomain = &(pr->performance->domain_info); | |
556 | ||
557 | state.length = sizeof(struct acpi_psd_package); | |
558 | state.pointer = pdomain; | |
559 | ||
560 | status = acpi_extract_package(&(psd->package.elements[0]), | |
561 | &format, &state); | |
562 | if (ACPI_FAILURE(status)) { | |
55ac9a01 | 563 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
564 | result = -EFAULT; |
565 | goto end; | |
566 | } | |
567 | ||
568 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
55ac9a01 | 569 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
3b2d9942 VP |
570 | result = -EFAULT; |
571 | goto end; | |
572 | } | |
573 | ||
574 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
55ac9a01 | 575 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
3b2d9942 VP |
576 | result = -EFAULT; |
577 | goto end; | |
578 | } | |
579 | ||
580 | end: | |
02438d87 | 581 | kfree(buffer.pointer); |
9011bff4 | 582 | return result; |
3b2d9942 VP |
583 | } |
584 | ||
585 | int acpi_processor_preregister_performance( | |
50109292 | 586 | struct acpi_processor_performance *performance) |
3b2d9942 VP |
587 | { |
588 | int count, count_target; | |
589 | int retval = 0; | |
590 | unsigned int i, j; | |
591 | cpumask_t covered_cpus; | |
592 | struct acpi_processor *pr; | |
593 | struct acpi_psd_package *pdomain; | |
594 | struct acpi_processor *match_pr; | |
595 | struct acpi_psd_package *match_pdomain; | |
596 | ||
785fcccd | 597 | mutex_lock(&performance_mutex); |
3b2d9942 VP |
598 | |
599 | retval = 0; | |
600 | ||
601 | /* Call _PSD for all CPUs */ | |
193de0c7 | 602 | for_each_possible_cpu(i) { |
706546d0 | 603 | pr = per_cpu(processors, i); |
3b2d9942 VP |
604 | if (!pr) { |
605 | /* Look only at processors in ACPI namespace */ | |
606 | continue; | |
607 | } | |
608 | ||
609 | if (pr->performance) { | |
610 | retval = -EBUSY; | |
611 | continue; | |
612 | } | |
613 | ||
50109292 | 614 | if (!performance || !percpu_ptr(performance, i)) { |
3b2d9942 VP |
615 | retval = -EINVAL; |
616 | continue; | |
617 | } | |
618 | ||
50109292 | 619 | pr->performance = percpu_ptr(performance, i); |
3b2d9942 VP |
620 | cpu_set(i, pr->performance->shared_cpu_map); |
621 | if (acpi_processor_get_psd(pr)) { | |
622 | retval = -EINVAL; | |
623 | continue; | |
624 | } | |
625 | } | |
626 | if (retval) | |
627 | goto err_ret; | |
628 | ||
629 | /* | |
630 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
631 | * domain info. | |
632 | */ | |
193de0c7 | 633 | for_each_possible_cpu(i) { |
706546d0 | 634 | pr = per_cpu(processors, i); |
3b2d9942 VP |
635 | if (!pr) |
636 | continue; | |
637 | ||
638 | /* Basic validity check for domain info */ | |
639 | pdomain = &(pr->performance->domain_info); | |
640 | if ((pdomain->revision != ACPI_PSD_REV0_REVISION) || | |
641 | (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) { | |
642 | retval = -EINVAL; | |
643 | goto err_ret; | |
644 | } | |
645 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
646 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
647 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
648 | retval = -EINVAL; | |
649 | goto err_ret; | |
650 | } | |
651 | } | |
652 | ||
653 | cpus_clear(covered_cpus); | |
193de0c7 | 654 | for_each_possible_cpu(i) { |
706546d0 | 655 | pr = per_cpu(processors, i); |
3b2d9942 VP |
656 | if (!pr) |
657 | continue; | |
658 | ||
659 | if (cpu_isset(i, covered_cpus)) | |
660 | continue; | |
661 | ||
662 | pdomain = &(pr->performance->domain_info); | |
663 | cpu_set(i, pr->performance->shared_cpu_map); | |
664 | cpu_set(i, covered_cpus); | |
665 | if (pdomain->num_processors <= 1) | |
666 | continue; | |
667 | ||
668 | /* Validate the Domain info */ | |
669 | count_target = pdomain->num_processors; | |
670 | count = 1; | |
46f18e3a | 671 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 672 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
673 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
674 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
675 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 676 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 677 | |
193de0c7 | 678 | for_each_possible_cpu(j) { |
3b2d9942 VP |
679 | if (i == j) |
680 | continue; | |
681 | ||
706546d0 | 682 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
683 | if (!match_pr) |
684 | continue; | |
685 | ||
686 | match_pdomain = &(match_pr->performance->domain_info); | |
687 | if (match_pdomain->domain != pdomain->domain) | |
688 | continue; | |
689 | ||
690 | /* Here i and j are in the same domain */ | |
691 | ||
692 | if (match_pdomain->num_processors != count_target) { | |
693 | retval = -EINVAL; | |
694 | goto err_ret; | |
695 | } | |
696 | ||
697 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
698 | retval = -EINVAL; | |
699 | goto err_ret; | |
700 | } | |
701 | ||
702 | cpu_set(j, covered_cpus); | |
703 | cpu_set(j, pr->performance->shared_cpu_map); | |
704 | count++; | |
705 | } | |
706 | ||
193de0c7 | 707 | for_each_possible_cpu(j) { |
3b2d9942 VP |
708 | if (i == j) |
709 | continue; | |
710 | ||
706546d0 | 711 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
712 | if (!match_pr) |
713 | continue; | |
714 | ||
715 | match_pdomain = &(match_pr->performance->domain_info); | |
716 | if (match_pdomain->domain != pdomain->domain) | |
717 | continue; | |
718 | ||
719 | match_pr->performance->shared_type = | |
720 | pr->performance->shared_type; | |
721 | match_pr->performance->shared_cpu_map = | |
722 | pr->performance->shared_cpu_map; | |
723 | } | |
724 | } | |
725 | ||
726 | err_ret: | |
193de0c7 | 727 | for_each_possible_cpu(i) { |
706546d0 | 728 | pr = per_cpu(processors, i); |
3b2d9942 VP |
729 | if (!pr || !pr->performance) |
730 | continue; | |
731 | ||
732 | /* Assume no coordination on any error parsing domain info */ | |
733 | if (retval) { | |
734 | cpus_clear(pr->performance->shared_cpu_map); | |
735 | cpu_set(i, pr->performance->shared_cpu_map); | |
736 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; | |
737 | } | |
738 | pr->performance = NULL; /* Will be set for real in register */ | |
739 | } | |
740 | ||
785fcccd | 741 | mutex_unlock(&performance_mutex); |
9011bff4 | 742 | return retval; |
3b2d9942 VP |
743 | } |
744 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
745 | ||
746 | ||
1da177e4 | 747 | int |
4be44fcd LB |
748 | acpi_processor_register_performance(struct acpi_processor_performance |
749 | *performance, unsigned int cpu) | |
1da177e4 LT |
750 | { |
751 | struct acpi_processor *pr; | |
752 | ||
1da177e4 LT |
753 | |
754 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 755 | return -EINVAL; |
1da177e4 | 756 | |
65c19bbd | 757 | mutex_lock(&performance_mutex); |
1da177e4 | 758 | |
706546d0 | 759 | pr = per_cpu(processors, cpu); |
1da177e4 | 760 | if (!pr) { |
65c19bbd | 761 | mutex_unlock(&performance_mutex); |
d550d98d | 762 | return -ENODEV; |
1da177e4 LT |
763 | } |
764 | ||
765 | if (pr->performance) { | |
65c19bbd | 766 | mutex_unlock(&performance_mutex); |
d550d98d | 767 | return -EBUSY; |
1da177e4 LT |
768 | } |
769 | ||
a913f507 AM |
770 | WARN_ON(!performance); |
771 | ||
1da177e4 LT |
772 | pr->performance = performance; |
773 | ||
774 | if (acpi_processor_get_performance_info(pr)) { | |
775 | pr->performance = NULL; | |
65c19bbd | 776 | mutex_unlock(&performance_mutex); |
d550d98d | 777 | return -EIO; |
1da177e4 LT |
778 | } |
779 | ||
780 | acpi_cpufreq_add_file(pr); | |
781 | ||
65c19bbd | 782 | mutex_unlock(&performance_mutex); |
d550d98d | 783 | return 0; |
1da177e4 | 784 | } |
1da177e4 | 785 | |
4be44fcd | 786 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 LT |
787 | |
788 | void | |
4be44fcd LB |
789 | acpi_processor_unregister_performance(struct acpi_processor_performance |
790 | *performance, unsigned int cpu) | |
1da177e4 LT |
791 | { |
792 | struct acpi_processor *pr; | |
793 | ||
1da177e4 | 794 | |
65c19bbd | 795 | mutex_lock(&performance_mutex); |
1da177e4 | 796 | |
706546d0 | 797 | pr = per_cpu(processors, cpu); |
1da177e4 | 798 | if (!pr) { |
65c19bbd | 799 | mutex_unlock(&performance_mutex); |
d550d98d | 800 | return; |
1da177e4 LT |
801 | } |
802 | ||
a913f507 AM |
803 | if (pr->performance) |
804 | kfree(pr->performance->states); | |
1da177e4 LT |
805 | pr->performance = NULL; |
806 | ||
807 | acpi_cpufreq_remove_file(pr); | |
808 | ||
65c19bbd | 809 | mutex_unlock(&performance_mutex); |
1da177e4 | 810 | |
d550d98d | 811 | return; |
1da177e4 | 812 | } |
4be44fcd | 813 | |
1da177e4 | 814 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |