]>
Commit | Line | Data |
---|---|---|
c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $) | |
4 | * | |
5 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
6 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
7 | * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> | |
8 | * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> | |
9 | * - Added processor hotplug support | |
1da177e4 LT |
10 | */ |
11 | ||
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/cpufreq.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
8b48463f LZ |
17 | #include <linux/acpi.h> |
18 | #include <acpi/processor.h> | |
16be87ea | 19 | #ifdef CONFIG_X86 |
910dfae2 | 20 | #include <asm/cpufeature.h> |
16be87ea | 21 | #endif |
1da177e4 | 22 | |
a192a958 LB |
23 | #define PREFIX "ACPI: " |
24 | ||
1da177e4 | 25 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 LT |
26 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
27 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
f52fd66d | 28 | ACPI_MODULE_NAME("processor_perflib"); |
1da177e4 | 29 | |
65c19bbd | 30 | static DEFINE_MUTEX(performance_mutex); |
1da177e4 LT |
31 | |
32 | /* | |
33 | * _PPC support is implemented as a CPUfreq policy notifier: | |
34 | * This means each time a CPUfreq driver registered also with | |
35 | * the ACPI core is asked to change the speed policy, the maximum | |
36 | * value is adjusted so that it is within the platform limit. | |
37 | * | |
38 | * Also, when a new platform limit value is detected, the CPUfreq | |
39 | * policy is adjusted accordingly. | |
40 | */ | |
41 | ||
a1531acd TR |
42 | /* ignore_ppc: |
43 | * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet | |
44 | * ignore _PPC | |
45 | * 0 -> cpufreq low level drivers initialized -> consider _PPC values | |
46 | * 1 -> ignore _PPC totally -> forced by user through boot param | |
47 | */ | |
9f497bcc | 48 | static int ignore_ppc = -1; |
613e5f33 | 49 | module_param(ignore_ppc, int, 0644); |
623b78c3 TR |
50 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
51 | "limited by BIOS, this should help"); | |
52 | ||
1da177e4 LT |
53 | #define PPC_REGISTERED 1 |
54 | #define PPC_IN_USE 2 | |
55 | ||
a1531acd | 56 | static int acpi_processor_ppc_status; |
1da177e4 LT |
57 | |
58 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, | |
4be44fcd | 59 | unsigned long event, void *data) |
1da177e4 LT |
60 | { |
61 | struct cpufreq_policy *policy = data; | |
62 | struct acpi_processor *pr; | |
63 | unsigned int ppc = 0; | |
64 | ||
fa29ae5f | 65 | if (ignore_ppc < 0) |
a1531acd | 66 | ignore_ppc = 0; |
a1531acd | 67 | |
623b78c3 TR |
68 | if (ignore_ppc) |
69 | return 0; | |
70 | ||
6bfb7c74 | 71 | if (event != CPUFREQ_ADJUST) |
9b67c5d4 TR |
72 | return 0; |
73 | ||
74 | mutex_lock(&performance_mutex); | |
1da177e4 | 75 | |
706546d0 | 76 | pr = per_cpu(processors, policy->cpu); |
1da177e4 LT |
77 | if (!pr || !pr->performance) |
78 | goto out; | |
79 | ||
4be44fcd | 80 | ppc = (unsigned int)pr->performance_platform_limit; |
1da177e4 | 81 | |
0916bd3e | 82 | if (ppc >= pr->performance->state_count) |
1da177e4 LT |
83 | goto out; |
84 | ||
85 | cpufreq_verify_within_limits(policy, 0, | |
4be44fcd LB |
86 | pr->performance->states[ppc]. |
87 | core_frequency * 1000); | |
1da177e4 | 88 | |
4be44fcd | 89 | out: |
65c19bbd | 90 | mutex_unlock(&performance_mutex); |
1da177e4 LT |
91 | |
92 | return 0; | |
93 | } | |
94 | ||
1da177e4 LT |
95 | static struct notifier_block acpi_ppc_notifier_block = { |
96 | .notifier_call = acpi_processor_ppc_notifier, | |
97 | }; | |
98 | ||
4be44fcd | 99 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
1da177e4 | 100 | { |
4be44fcd | 101 | acpi_status status = 0; |
27663c58 | 102 | unsigned long long ppc = 0; |
1da177e4 | 103 | |
1da177e4 LT |
104 | |
105 | if (!pr) | |
d550d98d | 106 | return -EINVAL; |
1da177e4 LT |
107 | |
108 | /* | |
109 | * _PPC indicates the maximum state currently supported by the platform | |
110 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. | |
111 | */ | |
112 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); | |
113 | ||
114 | if (status != AE_NOT_FOUND) | |
115 | acpi_processor_ppc_status |= PPC_IN_USE; | |
116 | ||
4be44fcd | 117 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
a6fc6720 | 118 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
d550d98d | 119 | return -ENODEV; |
1da177e4 LT |
120 | } |
121 | ||
2d06d8c4 | 122 | pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
919158d1 TR |
123 | (int)ppc, ppc ? "" : "not"); |
124 | ||
4be44fcd | 125 | pr->performance_platform_limit = (int)ppc; |
1da177e4 | 126 | |
d550d98d | 127 | return 0; |
1da177e4 LT |
128 | } |
129 | ||
d81c45e1 ZY |
130 | #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
131 | /* | |
132 | * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status | |
133 | * @handle: ACPI processor handle | |
134 | * @status: the status code of _PPC evaluation | |
135 | * 0: success. OSPM is now using the performance state specificed. | |
136 | * 1: failure. OSPM has not changed the number of P-states in use | |
137 | */ | |
138 | static void acpi_processor_ppc_ost(acpi_handle handle, int status) | |
139 | { | |
4a6172a4 JL |
140 | if (acpi_has_method(handle, "_OST")) |
141 | acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE, | |
142 | status, NULL); | |
d81c45e1 ZY |
143 | } |
144 | ||
bca5f557 | 145 | void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) |
1da177e4 | 146 | { |
623b78c3 TR |
147 | int ret; |
148 | ||
ba1edb9a | 149 | if (ignore_ppc || !pr->performance) { |
d81c45e1 ZY |
150 | /* |
151 | * Only when it is notification event, the _OST object | |
152 | * will be evaluated. Otherwise it is skipped. | |
153 | */ | |
154 | if (event_flag) | |
155 | acpi_processor_ppc_ost(pr->handle, 1); | |
bca5f557 | 156 | return; |
d81c45e1 | 157 | } |
623b78c3 TR |
158 | |
159 | ret = acpi_processor_get_platform_limit(pr); | |
d81c45e1 ZY |
160 | /* |
161 | * Only when it is notification event, the _OST object | |
162 | * will be evaluated. Otherwise it is skipped. | |
163 | */ | |
164 | if (event_flag) { | |
165 | if (ret < 0) | |
166 | acpi_processor_ppc_ost(pr->handle, 1); | |
167 | else | |
168 | acpi_processor_ppc_ost(pr->handle, 0); | |
169 | } | |
bca5f557 | 170 | if (ret >= 0) |
5a25e3f7 | 171 | cpufreq_update_limits(pr->id); |
1da177e4 LT |
172 | } |
173 | ||
e2f74f35 TR |
174 | int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) |
175 | { | |
176 | struct acpi_processor *pr; | |
177 | ||
178 | pr = per_cpu(processors, cpu); | |
179 | if (!pr || !pr->performance || !pr->performance->state_count) | |
180 | return -ENODEV; | |
181 | *limit = pr->performance->states[pr->performance_platform_limit]. | |
182 | core_frequency * 1000; | |
183 | return 0; | |
184 | } | |
185 | EXPORT_SYMBOL(acpi_processor_get_bios_limit); | |
186 | ||
4be44fcd LB |
187 | void acpi_processor_ppc_init(void) |
188 | { | |
189 | if (!cpufreq_register_notifier | |
190 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) | |
1da177e4 LT |
191 | acpi_processor_ppc_status |= PPC_REGISTERED; |
192 | else | |
4be44fcd LB |
193 | printk(KERN_DEBUG |
194 | "Warning: Processor Platform Limit not supported.\n"); | |
1da177e4 LT |
195 | } |
196 | ||
4be44fcd LB |
197 | void acpi_processor_ppc_exit(void) |
198 | { | |
1da177e4 | 199 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
4be44fcd LB |
200 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
201 | CPUFREQ_POLICY_NOTIFIER); | |
1da177e4 LT |
202 | |
203 | acpi_processor_ppc_status &= ~PPC_REGISTERED; | |
204 | } | |
205 | ||
4be44fcd | 206 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
1da177e4 | 207 | { |
4be44fcd LB |
208 | int result = 0; |
209 | acpi_status status = 0; | |
210 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
211 | union acpi_object *pct = NULL; | |
212 | union acpi_object obj = { 0 }; | |
1da177e4 | 213 | |
1da177e4 LT |
214 | |
215 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); | |
4be44fcd | 216 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 217 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
d550d98d | 218 | return -ENODEV; |
1da177e4 LT |
219 | } |
220 | ||
4be44fcd | 221 | pct = (union acpi_object *)buffer.pointer; |
1da177e4 | 222 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
4be44fcd | 223 | || (pct->package.count != 2)) { |
6468463a | 224 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
1da177e4 LT |
225 | result = -EFAULT; |
226 | goto end; | |
227 | } | |
228 | ||
229 | /* | |
230 | * control_register | |
231 | */ | |
232 | ||
233 | obj = pct->package.elements[0]; | |
234 | ||
235 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
236 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
237 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 238 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
1da177e4 LT |
239 | result = -EFAULT; |
240 | goto end; | |
241 | } | |
4be44fcd LB |
242 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
243 | sizeof(struct acpi_pct_register)); | |
1da177e4 LT |
244 | |
245 | /* | |
246 | * status_register | |
247 | */ | |
248 | ||
249 | obj = pct->package.elements[1]; | |
250 | ||
251 | if ((obj.type != ACPI_TYPE_BUFFER) | |
4be44fcd LB |
252 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
253 | || (obj.buffer.pointer == NULL)) { | |
6468463a | 254 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
1da177e4 LT |
255 | result = -EFAULT; |
256 | goto end; | |
257 | } | |
258 | ||
4be44fcd LB |
259 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
260 | sizeof(struct acpi_pct_register)); | |
1da177e4 | 261 | |
4be44fcd | 262 | end: |
02438d87 | 263 | kfree(buffer.pointer); |
1da177e4 | 264 | |
d550d98d | 265 | return result; |
1da177e4 LT |
266 | } |
267 | ||
f594065f MG |
268 | #ifdef CONFIG_X86 |
269 | /* | |
270 | * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding | |
271 | * in their ACPI data. Calculate the real values and fix up the _PSS data. | |
272 | */ | |
273 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) | |
274 | { | |
275 | u32 hi, lo, fid, did; | |
276 | int index = px->control & 0x00000007; | |
277 | ||
278 | if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) | |
279 | return; | |
280 | ||
281 | if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) | |
282 | || boot_cpu_data.x86 == 0x11) { | |
283 | rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); | |
9855d8ce SB |
284 | /* |
285 | * MSR C001_0064+: | |
286 | * Bit 63: PstateEn. Read-write. If set, the P-state is valid. | |
287 | */ | |
288 | if (!(hi & BIT(31))) | |
289 | return; | |
290 | ||
f594065f MG |
291 | fid = lo & 0x3f; |
292 | did = (lo >> 6) & 7; | |
293 | if (boot_cpu_data.x86 == 0x10) | |
294 | px->core_frequency = (100 * (fid + 0x10)) >> did; | |
295 | else | |
296 | px->core_frequency = (100 * (fid + 8)) >> did; | |
297 | } | |
298 | } | |
299 | #else | |
300 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; | |
301 | #endif | |
302 | ||
4be44fcd | 303 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
1da177e4 | 304 | { |
4be44fcd LB |
305 | int result = 0; |
306 | acpi_status status = AE_OK; | |
307 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
308 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; | |
309 | struct acpi_buffer state = { 0, NULL }; | |
310 | union acpi_object *pss = NULL; | |
311 | int i; | |
d8e725f3 | 312 | int last_invalid = -1; |
1da177e4 | 313 | |
1da177e4 LT |
314 | |
315 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
4be44fcd | 316 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 317 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
d550d98d | 318 | return -ENODEV; |
1da177e4 LT |
319 | } |
320 | ||
50dd0969 | 321 | pss = buffer.pointer; |
1da177e4 | 322 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
6468463a | 323 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
1da177e4 LT |
324 | result = -EFAULT; |
325 | goto end; | |
326 | } | |
327 | ||
328 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", | |
4be44fcd | 329 | pss->package.count)); |
1da177e4 LT |
330 | |
331 | pr->performance->state_count = pss->package.count; | |
4be44fcd | 332 | pr->performance->states = |
6da2ec56 KC |
333 | kmalloc_array(pss->package.count, |
334 | sizeof(struct acpi_processor_px), | |
335 | GFP_KERNEL); | |
1da177e4 LT |
336 | if (!pr->performance->states) { |
337 | result = -ENOMEM; | |
338 | goto end; | |
339 | } | |
340 | ||
341 | for (i = 0; i < pr->performance->state_count; i++) { | |
342 | ||
343 | struct acpi_processor_px *px = &(pr->performance->states[i]); | |
344 | ||
345 | state.length = sizeof(struct acpi_processor_px); | |
346 | state.pointer = px; | |
347 | ||
348 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
349 | ||
350 | status = acpi_extract_package(&(pss->package.elements[i]), | |
4be44fcd | 351 | &format, &state); |
1da177e4 | 352 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 353 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
1da177e4 LT |
354 | result = -EFAULT; |
355 | kfree(pr->performance->states); | |
356 | goto end; | |
357 | } | |
358 | ||
f594065f MG |
359 | amd_fixup_frequency(px, i); |
360 | ||
1da177e4 | 361 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
362 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
363 | i, | |
364 | (u32) px->core_frequency, | |
365 | (u32) px->power, | |
366 | (u32) px->transition_latency, | |
367 | (u32) px->bus_master_latency, | |
368 | (u32) px->control, (u32) px->status)); | |
1da177e4 | 369 | |
34d531e6 LB |
370 | /* |
371 | * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq | |
372 | */ | |
373 | if (!px->core_frequency || | |
374 | ((u32)(px->core_frequency * 1000) != | |
375 | (px->core_frequency * 1000))) { | |
376 | printk(KERN_ERR FW_BUG PREFIX | |
d8e725f3 MAC |
377 | "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", |
378 | pr->id, px->core_frequency); | |
379 | if (last_invalid == -1) | |
380 | last_invalid = i; | |
381 | } else { | |
382 | if (last_invalid != -1) { | |
383 | /* | |
384 | * Copy this valid entry over last_invalid entry | |
385 | */ | |
386 | memcpy(&(pr->performance->states[last_invalid]), | |
387 | px, sizeof(struct acpi_processor_px)); | |
388 | ++last_invalid; | |
389 | } | |
1da177e4 LT |
390 | } |
391 | } | |
392 | ||
d8e725f3 MAC |
393 | if (last_invalid == 0) { |
394 | printk(KERN_ERR FW_BUG PREFIX | |
395 | "No valid BIOS _PSS frequency found for processor %d\n", pr->id); | |
396 | result = -EFAULT; | |
397 | kfree(pr->performance->states); | |
398 | pr->performance->states = NULL; | |
399 | } | |
400 | ||
401 | if (last_invalid > 0) | |
402 | pr->performance->state_count = last_invalid; | |
403 | ||
4be44fcd | 404 | end: |
02438d87 | 405 | kfree(buffer.pointer); |
1da177e4 | 406 | |
d550d98d | 407 | return result; |
1da177e4 LT |
408 | } |
409 | ||
c705c78c | 410 | int acpi_processor_get_performance_info(struct acpi_processor *pr) |
1da177e4 | 411 | { |
4be44fcd | 412 | int result = 0; |
1da177e4 | 413 | |
1da177e4 | 414 | if (!pr || !pr->performance || !pr->handle) |
d550d98d | 415 | return -EINVAL; |
1da177e4 | 416 | |
952c63e9 | 417 | if (!acpi_has_method(pr->handle, "_PCT")) { |
1da177e4 | 418 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd | 419 | "ACPI-based processor performance control unavailable\n")); |
d550d98d | 420 | return -ENODEV; |
1da177e4 LT |
421 | } |
422 | ||
423 | result = acpi_processor_get_performance_control(pr); | |
424 | if (result) | |
910dfae2 | 425 | goto update_bios; |
1da177e4 LT |
426 | |
427 | result = acpi_processor_get_performance_states(pr); | |
428 | if (result) | |
910dfae2 | 429 | goto update_bios; |
1da177e4 | 430 | |
455c0d71 DW |
431 | /* We need to call _PPC once when cpufreq starts */ |
432 | if (ignore_ppc != 1) | |
433 | result = acpi_processor_get_platform_limit(pr); | |
434 | ||
435 | return result; | |
910dfae2 TR |
436 | |
437 | /* | |
438 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that | |
439 | * the BIOS is older than the CPU and does not know its frequencies | |
440 | */ | |
441 | update_bios: | |
16be87ea | 442 | #ifdef CONFIG_X86 |
952c63e9 | 443 | if (acpi_has_method(pr->handle, "_PPC")) { |
910dfae2 TR |
444 | if(boot_cpu_has(X86_FEATURE_EST)) |
445 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " | |
446 | "frequency support\n"); | |
447 | } | |
16be87ea | 448 | #endif |
910dfae2 | 449 | return result; |
1da177e4 | 450 | } |
c705c78c | 451 | EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); |
d0ea59e1 RW |
452 | |
453 | int acpi_processor_pstate_control(void) | |
4be44fcd LB |
454 | { |
455 | acpi_status status; | |
1da177e4 | 456 | |
d0ea59e1 RW |
457 | if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control) |
458 | return 0; | |
459 | ||
460 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
461 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", | |
462 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); | |
463 | ||
464 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, | |
465 | (u32)acpi_gbl_FADT.pstate_control, 8); | |
466 | if (ACPI_SUCCESS(status)) | |
467 | return 1; | |
468 | ||
469 | ACPI_EXCEPTION((AE_INFO, status, | |
470 | "Failed to write pstate_control [0x%x] to smi_command [0x%x]", | |
471 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); | |
472 | return -EIO; | |
473 | } | |
474 | ||
475 | int acpi_processor_notify_smm(struct module *calling_module) | |
476 | { | |
477 | static int is_done = 0; | |
478 | int result; | |
1da177e4 LT |
479 | |
480 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) | |
d550d98d | 481 | return -EBUSY; |
1da177e4 LT |
482 | |
483 | if (!try_module_get(calling_module)) | |
d550d98d | 484 | return -EINVAL; |
1da177e4 | 485 | |
58f87ed0 LDM |
486 | /* is_done is set to negative if an error occurred, |
487 | * and to postitive if _no_ error occurred, but SMM | |
1da177e4 LT |
488 | * was already notified. This avoids double notification |
489 | * which might lead to unexpected results... | |
490 | */ | |
491 | if (is_done > 0) { | |
492 | module_put(calling_module); | |
d550d98d | 493 | return 0; |
4be44fcd | 494 | } else if (is_done < 0) { |
1da177e4 | 495 | module_put(calling_module); |
d550d98d | 496 | return is_done; |
1da177e4 LT |
497 | } |
498 | ||
499 | is_done = -EIO; | |
500 | ||
d0ea59e1 RW |
501 | result = acpi_processor_pstate_control(); |
502 | if (!result) { | |
ad71860a | 503 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
1da177e4 | 504 | module_put(calling_module); |
d550d98d | 505 | return 0; |
1da177e4 | 506 | } |
d0ea59e1 | 507 | if (result < 0) { |
1da177e4 | 508 | module_put(calling_module); |
d0ea59e1 | 509 | return result; |
1da177e4 LT |
510 | } |
511 | ||
512 | /* Success. If there's no _PPC, we need to fear nothing, so | |
513 | * we can allow the cpufreq driver to be rmmod'ed. */ | |
514 | is_done = 1; | |
515 | ||
516 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) | |
517 | module_put(calling_module); | |
518 | ||
d550d98d | 519 | return 0; |
1da177e4 | 520 | } |
1da177e4 | 521 | |
4be44fcd | 522 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
1da177e4 | 523 | |
4d0f1ce6 | 524 | int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain) |
3b2d9942 VP |
525 | { |
526 | int result = 0; | |
527 | acpi_status status = AE_OK; | |
528 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
529 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; | |
530 | struct acpi_buffer state = {0, NULL}; | |
531 | union acpi_object *psd = NULL; | |
3b2d9942 | 532 | |
4d0f1ce6 | 533 | status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer); |
3b2d9942 | 534 | if (ACPI_FAILURE(status)) { |
9011bff4 | 535 | return -ENODEV; |
3b2d9942 VP |
536 | } |
537 | ||
50dd0969 | 538 | psd = buffer.pointer; |
3b2d9942 | 539 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
55ac9a01 | 540 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
541 | result = -EFAULT; |
542 | goto end; | |
543 | } | |
544 | ||
545 | if (psd->package.count != 1) { | |
55ac9a01 | 546 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
547 | result = -EFAULT; |
548 | goto end; | |
549 | } | |
550 | ||
3b2d9942 VP |
551 | state.length = sizeof(struct acpi_psd_package); |
552 | state.pointer = pdomain; | |
553 | ||
554 | status = acpi_extract_package(&(psd->package.elements[0]), | |
555 | &format, &state); | |
556 | if (ACPI_FAILURE(status)) { | |
55ac9a01 | 557 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
3b2d9942 VP |
558 | result = -EFAULT; |
559 | goto end; | |
560 | } | |
561 | ||
562 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { | |
55ac9a01 | 563 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
3b2d9942 VP |
564 | result = -EFAULT; |
565 | goto end; | |
566 | } | |
567 | ||
568 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { | |
55ac9a01 | 569 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
3b2d9942 VP |
570 | result = -EFAULT; |
571 | goto end; | |
572 | } | |
573 | ||
e1eb4779 SG |
574 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
575 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
576 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
577 | printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); | |
578 | result = -EFAULT; | |
579 | goto end; | |
580 | } | |
3b2d9942 | 581 | end: |
02438d87 | 582 | kfree(buffer.pointer); |
9011bff4 | 583 | return result; |
3b2d9942 | 584 | } |
4d0f1ce6 | 585 | EXPORT_SYMBOL(acpi_processor_get_psd); |
3b2d9942 VP |
586 | |
587 | int acpi_processor_preregister_performance( | |
a29d8b8e | 588 | struct acpi_processor_performance __percpu *performance) |
3b2d9942 | 589 | { |
09d5ca80 | 590 | int count_target; |
3b2d9942 VP |
591 | int retval = 0; |
592 | unsigned int i, j; | |
2fdf66b4 | 593 | cpumask_var_t covered_cpus; |
3b2d9942 VP |
594 | struct acpi_processor *pr; |
595 | struct acpi_psd_package *pdomain; | |
596 | struct acpi_processor *match_pr; | |
597 | struct acpi_psd_package *match_pdomain; | |
598 | ||
79f55997 | 599 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
600 | return -ENOMEM; |
601 | ||
785fcccd | 602 | mutex_lock(&performance_mutex); |
3b2d9942 | 603 | |
e1eb4779 SG |
604 | /* |
605 | * Check if another driver has already registered, and abort before | |
606 | * changing pr->performance if it has. Check input data as well. | |
607 | */ | |
193de0c7 | 608 | for_each_possible_cpu(i) { |
706546d0 | 609 | pr = per_cpu(processors, i); |
3b2d9942 VP |
610 | if (!pr) { |
611 | /* Look only at processors in ACPI namespace */ | |
612 | continue; | |
613 | } | |
614 | ||
615 | if (pr->performance) { | |
616 | retval = -EBUSY; | |
e1eb4779 | 617 | goto err_out; |
3b2d9942 VP |
618 | } |
619 | ||
b36128c8 | 620 | if (!performance || !per_cpu_ptr(performance, i)) { |
3b2d9942 | 621 | retval = -EINVAL; |
e1eb4779 | 622 | goto err_out; |
3b2d9942 | 623 | } |
e1eb4779 SG |
624 | } |
625 | ||
626 | /* Call _PSD for all CPUs */ | |
627 | for_each_possible_cpu(i) { | |
628 | pr = per_cpu(processors, i); | |
629 | if (!pr) | |
630 | continue; | |
3b2d9942 | 631 | |
b36128c8 | 632 | pr->performance = per_cpu_ptr(performance, i); |
2fdf66b4 | 633 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
4d0f1ce6 JM |
634 | pdomain = &(pr->performance->domain_info); |
635 | if (acpi_processor_get_psd(pr->handle, pdomain)) { | |
3b2d9942 VP |
636 | retval = -EINVAL; |
637 | continue; | |
638 | } | |
639 | } | |
640 | if (retval) | |
641 | goto err_ret; | |
642 | ||
643 | /* | |
644 | * Now that we have _PSD data from all CPUs, lets setup P-state | |
645 | * domain info. | |
646 | */ | |
193de0c7 | 647 | for_each_possible_cpu(i) { |
706546d0 | 648 | pr = per_cpu(processors, i); |
3b2d9942 VP |
649 | if (!pr) |
650 | continue; | |
651 | ||
2fdf66b4 | 652 | if (cpumask_test_cpu(i, covered_cpus)) |
3b2d9942 VP |
653 | continue; |
654 | ||
655 | pdomain = &(pr->performance->domain_info); | |
2fdf66b4 RR |
656 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
657 | cpumask_set_cpu(i, covered_cpus); | |
3b2d9942 VP |
658 | if (pdomain->num_processors <= 1) |
659 | continue; | |
660 | ||
661 | /* Validate the Domain info */ | |
662 | count_target = pdomain->num_processors; | |
46f18e3a | 663 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
3b2d9942 | 664 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
46f18e3a VP |
665 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
666 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
667 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) | |
3b2d9942 | 668 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
3b2d9942 | 669 | |
193de0c7 | 670 | for_each_possible_cpu(j) { |
3b2d9942 VP |
671 | if (i == j) |
672 | continue; | |
673 | ||
706546d0 | 674 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
675 | if (!match_pr) |
676 | continue; | |
677 | ||
678 | match_pdomain = &(match_pr->performance->domain_info); | |
679 | if (match_pdomain->domain != pdomain->domain) | |
680 | continue; | |
681 | ||
682 | /* Here i and j are in the same domain */ | |
683 | ||
684 | if (match_pdomain->num_processors != count_target) { | |
685 | retval = -EINVAL; | |
686 | goto err_ret; | |
687 | } | |
688 | ||
689 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
690 | retval = -EINVAL; | |
691 | goto err_ret; | |
692 | } | |
693 | ||
2fdf66b4 RR |
694 | cpumask_set_cpu(j, covered_cpus); |
695 | cpumask_set_cpu(j, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
696 | } |
697 | ||
193de0c7 | 698 | for_each_possible_cpu(j) { |
3b2d9942 VP |
699 | if (i == j) |
700 | continue; | |
701 | ||
706546d0 | 702 | match_pr = per_cpu(processors, j); |
3b2d9942 VP |
703 | if (!match_pr) |
704 | continue; | |
705 | ||
706 | match_pdomain = &(match_pr->performance->domain_info); | |
707 | if (match_pdomain->domain != pdomain->domain) | |
708 | continue; | |
709 | ||
710 | match_pr->performance->shared_type = | |
711 | pr->performance->shared_type; | |
2fdf66b4 RR |
712 | cpumask_copy(match_pr->performance->shared_cpu_map, |
713 | pr->performance->shared_cpu_map); | |
3b2d9942 VP |
714 | } |
715 | } | |
716 | ||
717 | err_ret: | |
193de0c7 | 718 | for_each_possible_cpu(i) { |
706546d0 | 719 | pr = per_cpu(processors, i); |
3b2d9942 VP |
720 | if (!pr || !pr->performance) |
721 | continue; | |
722 | ||
723 | /* Assume no coordination on any error parsing domain info */ | |
724 | if (retval) { | |
2fdf66b4 RR |
725 | cpumask_clear(pr->performance->shared_cpu_map); |
726 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); | |
3b2d9942 VP |
727 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
728 | } | |
729 | pr->performance = NULL; /* Will be set for real in register */ | |
730 | } | |
731 | ||
e1eb4779 | 732 | err_out: |
785fcccd | 733 | mutex_unlock(&performance_mutex); |
2fdf66b4 | 734 | free_cpumask_var(covered_cpus); |
9011bff4 | 735 | return retval; |
3b2d9942 VP |
736 | } |
737 | EXPORT_SYMBOL(acpi_processor_preregister_performance); | |
738 | ||
1da177e4 | 739 | int |
4be44fcd LB |
740 | acpi_processor_register_performance(struct acpi_processor_performance |
741 | *performance, unsigned int cpu) | |
1da177e4 LT |
742 | { |
743 | struct acpi_processor *pr; | |
744 | ||
1da177e4 | 745 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
d550d98d | 746 | return -EINVAL; |
1da177e4 | 747 | |
65c19bbd | 748 | mutex_lock(&performance_mutex); |
1da177e4 | 749 | |
706546d0 | 750 | pr = per_cpu(processors, cpu); |
1da177e4 | 751 | if (!pr) { |
65c19bbd | 752 | mutex_unlock(&performance_mutex); |
d550d98d | 753 | return -ENODEV; |
1da177e4 LT |
754 | } |
755 | ||
756 | if (pr->performance) { | |
65c19bbd | 757 | mutex_unlock(&performance_mutex); |
d550d98d | 758 | return -EBUSY; |
1da177e4 LT |
759 | } |
760 | ||
a913f507 AM |
761 | WARN_ON(!performance); |
762 | ||
1da177e4 LT |
763 | pr->performance = performance; |
764 | ||
765 | if (acpi_processor_get_performance_info(pr)) { | |
766 | pr->performance = NULL; | |
65c19bbd | 767 | mutex_unlock(&performance_mutex); |
d550d98d | 768 | return -EIO; |
1da177e4 LT |
769 | } |
770 | ||
65c19bbd | 771 | mutex_unlock(&performance_mutex); |
d550d98d | 772 | return 0; |
1da177e4 | 773 | } |
1da177e4 | 774 | |
4be44fcd | 775 | EXPORT_SYMBOL(acpi_processor_register_performance); |
1da177e4 | 776 | |
b2f8dc4c | 777 | void acpi_processor_unregister_performance(unsigned int cpu) |
1da177e4 LT |
778 | { |
779 | struct acpi_processor *pr; | |
780 | ||
65c19bbd | 781 | mutex_lock(&performance_mutex); |
1da177e4 | 782 | |
706546d0 | 783 | pr = per_cpu(processors, cpu); |
1da177e4 | 784 | if (!pr) { |
65c19bbd | 785 | mutex_unlock(&performance_mutex); |
d550d98d | 786 | return; |
1da177e4 LT |
787 | } |
788 | ||
a913f507 AM |
789 | if (pr->performance) |
790 | kfree(pr->performance->states); | |
1da177e4 LT |
791 | pr->performance = NULL; |
792 | ||
65c19bbd | 793 | mutex_unlock(&performance_mutex); |
1da177e4 | 794 | |
d550d98d | 795 | return; |
1da177e4 | 796 | } |
4be44fcd | 797 | |
1da177e4 | 798 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |