1 // SPDX-License-Identifier: GPL-2.0-or-later
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
10 */
11
12 #define pr_fmt(fmt) "ACPI: " fmt
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/cpufreq.h>
18 #include <linux/slab.h>
19 #include <linux/acpi.h>
20 #include <acpi/processor.h>
21 #ifdef CONFIG_X86
22 #include <asm/cpufeature.h>
23 #include <asm/msr.h>
24 #endif
25
26 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
27
28 /*
29 * _PPC support is implemented as a CPUfreq policy notifier:
30 * This means each time a CPUfreq driver registered also with
31 * the ACPI core is asked to change the speed policy, the maximum
32 * value is adjusted so that it is within the platform limit.
33 *
34 * Also, when a new platform limit value is detected, the CPUfreq
35 * policy is adjusted accordingly.
36 */
37
38 /* ignore_ppc:
39 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
40 * ignore _PPC
41 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
42 * 1 -> ignore _PPC totally -> forced by user through boot param
43 */
44 static int ignore_ppc = -1;
45 module_param(ignore_ppc, int, 0644);
46 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
47 "limited by BIOS, this should help");
48
49 static bool acpi_processor_ppc_in_use;
50
acpi_processor_get_platform_limit(struct acpi_processor * pr)51 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
52 {
53 acpi_status status = 0;
54 unsigned long long ppc = 0;
55 s32 qos_value;
56 int index;
57 int ret;
58
59 if (!pr)
60 return -EINVAL;
61
62 /*
63 * _PPC indicates the maximum state currently supported by the platform
64 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
65 */
66 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
67 if (status != AE_NOT_FOUND) {
68 acpi_processor_ppc_in_use = true;
69
70 if (ACPI_FAILURE(status)) {
71 acpi_evaluation_failure_warn(pr->handle, "_PPC", status);
72 return -ENODEV;
73 }
74 }
75
76 index = ppc;
77
78 if (pr->performance_platform_limit == index ||
79 ppc >= pr->performance->state_count)
80 return 0;
81
82 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
83 index, index ? "is" : "is not");
84
85 pr->performance_platform_limit = index;
86
87 if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
88 return 0;
89
90 /*
91 * If _PPC returns 0, it means that all of the available states can be
92 * used ("no limit").
93 */
94 if (index == 0)
95 qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
96 else
97 qos_value = pr->performance->states[index].core_frequency * 1000;
98
99 ret = freq_qos_update_request(&pr->perflib_req, qos_value);
100 if (ret < 0) {
101 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
102 pr->id, ret);
103 }
104
105 return 0;
106 }
107
108 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
109 /*
110 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
111 * @handle: ACPI processor handle
112 * @status: the status code of _PPC evaluation
113 * 0: success. OSPM is now using the performance state specified.
114 * 1: failure. OSPM has not changed the number of P-states in use
115 */
acpi_processor_ppc_ost(acpi_handle handle,int status)116 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
117 {
118 if (acpi_has_method(handle, "_OST"))
119 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
120 status, NULL);
121 }
122
acpi_processor_ppc_has_changed(struct acpi_processor * pr,int event_flag)123 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
124 {
125 int ret;
126
127 if (ignore_ppc || !pr->performance) {
128 /*
129 * Only when it is notification event, the _OST object
130 * will be evaluated. Otherwise it is skipped.
131 */
132 if (event_flag)
133 acpi_processor_ppc_ost(pr->handle, 1);
134 return;
135 }
136
137 ret = acpi_processor_get_platform_limit(pr);
138 /*
139 * Only when it is notification event, the _OST object
140 * will be evaluated. Otherwise it is skipped.
141 */
142 if (event_flag) {
143 if (ret < 0)
144 acpi_processor_ppc_ost(pr->handle, 1);
145 else
146 acpi_processor_ppc_ost(pr->handle, 0);
147 }
148 if (ret >= 0)
149 cpufreq_update_limits(pr->id);
150 }
151
acpi_processor_get_bios_limit(int cpu,unsigned int * limit)152 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
153 {
154 struct acpi_processor *pr;
155
156 pr = per_cpu(processors, cpu);
157 if (!pr || !pr->performance || !pr->performance->state_count)
158 return -ENODEV;
159
160 *limit = pr->performance->states[pr->performance_platform_limit].
161 core_frequency * 1000;
162 return 0;
163 }
164 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
165
acpi_processor_ignore_ppc_init(void)166 void acpi_processor_ignore_ppc_init(void)
167 {
168 if (ignore_ppc < 0)
169 ignore_ppc = 0;
170 }
171
acpi_processor_ppc_init(struct cpufreq_policy * policy)172 void acpi_processor_ppc_init(struct cpufreq_policy *policy)
173 {
174 unsigned int cpu;
175
176 if (ignore_ppc == 1)
177 return;
178
179 for_each_cpu(cpu, policy->related_cpus) {
180 struct acpi_processor *pr = per_cpu(processors, cpu);
181 int ret;
182
183 if (!pr)
184 continue;
185
186 /*
187 * Reset performance_platform_limit in case there is a stale
188 * value in it, so as to make it match the "no limit" QoS value
189 * below.
190 */
191 pr->performance_platform_limit = 0;
192
193 ret = freq_qos_add_request(&policy->constraints,
194 &pr->perflib_req, FREQ_QOS_MAX,
195 FREQ_QOS_MAX_DEFAULT_VALUE);
196 if (ret < 0)
197 pr_err("Failed to add freq constraint for CPU%d (%d)\n",
198 cpu, ret);
199
200 if (!pr->performance)
201 continue;
202
203 ret = acpi_processor_get_platform_limit(pr);
204 if (ret)
205 pr_err("Failed to update freq constraint for CPU%d (%d)\n",
206 cpu, ret);
207 }
208 }
209
acpi_processor_ppc_exit(struct cpufreq_policy * policy)210 void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
211 {
212 unsigned int cpu;
213
214 for_each_cpu(cpu, policy->related_cpus) {
215 struct acpi_processor *pr = per_cpu(processors, cpu);
216
217 if (pr)
218 freq_qos_remove_request(&pr->perflib_req);
219 }
220 }
221
222 #ifdef CONFIG_X86
223
224 static DEFINE_MUTEX(performance_mutex);
225
acpi_processor_get_performance_control(struct acpi_processor * pr)226 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
227 {
228 int result = 0;
229 acpi_status status = 0;
230 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
231 union acpi_object *pct = NULL;
232 union acpi_object obj = { 0 };
233
234 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
235 if (ACPI_FAILURE(status)) {
236 acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
237 return -ENODEV;
238 }
239
240 pct = (union acpi_object *)buffer.pointer;
241 if (!pct || pct->type != ACPI_TYPE_PACKAGE || pct->package.count != 2) {
242 pr_err("Invalid _PCT data\n");
243 result = -EFAULT;
244 goto end;
245 }
246
247 /*
248 * control_register
249 */
250
251 obj = pct->package.elements[0];
252
253 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
254 obj.buffer.length < sizeof(struct acpi_pct_register)) {
255 pr_err("Invalid _PCT data (control_register)\n");
256 result = -EFAULT;
257 goto end;
258 }
259 memcpy(&pr->performance->control_register, obj.buffer.pointer,
260 sizeof(struct acpi_pct_register));
261
262 /*
263 * status_register
264 */
265
266 obj = pct->package.elements[1];
267
268 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
269 obj.buffer.length < sizeof(struct acpi_pct_register)) {
270 pr_err("Invalid _PCT data (status_register)\n");
271 result = -EFAULT;
272 goto end;
273 }
274
275 memcpy(&pr->performance->status_register, obj.buffer.pointer,
276 sizeof(struct acpi_pct_register));
277
278 end:
279 kfree(buffer.pointer);
280
281 return result;
282 }
283
284 /*
285 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
286 * in their ACPI data. Calculate the real values and fix up the _PSS data.
287 */
amd_fixup_frequency(struct acpi_processor_px * px,int i)288 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
289 {
290 u32 hi, lo, fid, did;
291 int index = px->control & 0x00000007;
292
293 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
294 return;
295
296 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) ||
297 boot_cpu_data.x86 == 0x11) {
298 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
299 /*
300 * MSR C001_0064+:
301 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
302 */
303 if (!(hi & BIT(31)))
304 return;
305
306 fid = lo & 0x3f;
307 did = (lo >> 6) & 7;
308 if (boot_cpu_data.x86 == 0x10)
309 px->core_frequency = (100 * (fid + 0x10)) >> did;
310 else
311 px->core_frequency = (100 * (fid + 8)) >> did;
312 }
313 }
314
acpi_processor_get_performance_states(struct acpi_processor * pr)315 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
316 {
317 int result = 0;
318 acpi_status status = AE_OK;
319 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
320 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
321 struct acpi_buffer state = { 0, NULL };
322 union acpi_object *pss = NULL;
323 int i;
324 int last_invalid = -1;
325
326 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
327 if (ACPI_FAILURE(status)) {
328 acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
329 return -ENODEV;
330 }
331
332 pss = buffer.pointer;
333 if (!pss || pss->type != ACPI_TYPE_PACKAGE) {
334 pr_err("Invalid _PSS data\n");
335 result = -EFAULT;
336 goto end;
337 }
338
339 acpi_handle_debug(pr->handle, "Found %d performance states\n",
340 pss->package.count);
341
342 pr->performance->state_count = pss->package.count;
343 pr->performance->states =
344 kmalloc_objs(struct acpi_processor_px, pss->package.count);
345 if (!pr->performance->states) {
346 result = -ENOMEM;
347 goto end;
348 }
349
350 for (i = 0; i < pr->performance->state_count; i++) {
351
352 struct acpi_processor_px *px = &(pr->performance->states[i]);
353
354 state.length = sizeof(struct acpi_processor_px);
355 state.pointer = px;
356
357 acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
358
359 status = acpi_extract_package(&(pss->package.elements[i]),
360 &format, &state);
361 if (ACPI_FAILURE(status)) {
362 acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
363 acpi_format_exception(status));
364 result = -EFAULT;
365 kfree(pr->performance->states);
366 goto end;
367 }
368
369 amd_fixup_frequency(px, i);
370
371 acpi_handle_debug(pr->handle,
372 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
373 i,
374 (u32) px->core_frequency,
375 (u32) px->power,
376 (u32) px->transition_latency,
377 (u32) px->bus_master_latency,
378 (u32) px->control, (u32) px->status);
379
380 /*
381 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
382 */
383 if (!px->core_frequency ||
384 (u32)(px->core_frequency * 1000) != px->core_frequency * 1000) {
385 pr_err(FW_BUG
386 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
387 pr->id, px->core_frequency);
388 if (last_invalid == -1)
389 last_invalid = i;
390 } else {
391 if (last_invalid != -1) {
392 /*
393 * Copy this valid entry over last_invalid entry
394 */
395 memcpy(&(pr->performance->states[last_invalid]),
396 px, sizeof(struct acpi_processor_px));
397 ++last_invalid;
398 }
399 }
400 }
401
402 if (last_invalid == 0) {
403 pr_err(FW_BUG
404 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
405 result = -EFAULT;
406 kfree(pr->performance->states);
407 pr->performance->states = NULL;
408 }
409
410 if (last_invalid > 0)
411 pr->performance->state_count = last_invalid;
412
413 end:
414 kfree(buffer.pointer);
415
416 return result;
417 }
418
acpi_processor_get_performance_info(struct acpi_processor * pr)419 int acpi_processor_get_performance_info(struct acpi_processor *pr)
420 {
421 int result = 0;
422
423 if (!pr || !pr->performance || !pr->handle)
424 return -EINVAL;
425
426 if (!acpi_has_method(pr->handle, "_PCT")) {
427 acpi_handle_debug(pr->handle,
428 "ACPI-based processor performance control unavailable\n");
429 return -ENODEV;
430 }
431
432 result = acpi_processor_get_performance_control(pr);
433 if (result)
434 goto update_bios;
435
436 result = acpi_processor_get_performance_states(pr);
437 if (result)
438 goto update_bios;
439
440 /* We need to call _PPC once when cpufreq starts */
441 if (ignore_ppc != 1)
442 result = acpi_processor_get_platform_limit(pr);
443
444 return result;
445
446 /*
447 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
448 * the BIOS is older than the CPU and does not know its frequencies
449 */
450 update_bios:
451 if (acpi_has_method(pr->handle, "_PPC")) {
452 if(boot_cpu_has(X86_FEATURE_EST))
453 pr_warn(FW_BUG "BIOS needs update for CPU "
454 "frequency support\n");
455 }
456 return result;
457 }
458 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
459
acpi_processor_pstate_control(void)460 int acpi_processor_pstate_control(void)
461 {
462 acpi_status status;
463
464 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
465 return 0;
466
467 pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
468 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
469
470 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
471 (u32)acpi_gbl_FADT.pstate_control, 8);
472 if (ACPI_SUCCESS(status))
473 return 1;
474
475 pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
476 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
477 acpi_format_exception(status));
478 return -EIO;
479 }
480
acpi_processor_notify_smm(struct module * calling_module)481 int acpi_processor_notify_smm(struct module *calling_module)
482 {
483 static int is_done;
484 int result = 0;
485
486 if (!acpi_processor_cpufreq_init)
487 return -EBUSY;
488
489 if (!try_module_get(calling_module))
490 return -EINVAL;
491
492 /*
493 * is_done is set to negative if an error occurs and to 1 if no error
494 * occurrs, but SMM has been notified already. This avoids repeated
495 * notification which might lead to unexpected results.
496 */
497 if (is_done != 0) {
498 if (is_done < 0)
499 result = is_done;
500
501 goto out_put;
502 }
503
504 result = acpi_processor_pstate_control();
505 if (result <= 0) {
506 if (result) {
507 is_done = result;
508 } else {
509 pr_debug("No SMI port or pstate_control\n");
510 is_done = 1;
511 }
512 goto out_put;
513 }
514
515 is_done = 1;
516 /*
517 * Success. If there _PPC, unloading the cpufreq driver would be risky,
518 * so disallow it in that case.
519 */
520 if (acpi_processor_ppc_in_use)
521 return 0;
522
523 out_put:
524 module_put(calling_module);
525 return result;
526 }
527 EXPORT_SYMBOL(acpi_processor_notify_smm);
528
acpi_processor_get_psd(acpi_handle handle,struct acpi_psd_package * pdomain)529 int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
530 {
531 int result = 0;
532 acpi_status status = AE_OK;
533 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
534 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
535 struct acpi_buffer state = {0, NULL};
536 union acpi_object *psd = NULL;
537
538 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
539 if (ACPI_FAILURE(status)) {
540 return -ENODEV;
541 }
542
543 psd = buffer.pointer;
544 if (!psd || psd->type != ACPI_TYPE_PACKAGE) {
545 pr_err("Invalid _PSD data\n");
546 result = -EFAULT;
547 goto end;
548 }
549
550 if (psd->package.count != 1) {
551 pr_err("Invalid _PSD data\n");
552 result = -EFAULT;
553 goto end;
554 }
555
556 state.length = sizeof(struct acpi_psd_package);
557 state.pointer = pdomain;
558
559 status = acpi_extract_package(&(psd->package.elements[0]), &format, &state);
560 if (ACPI_FAILURE(status)) {
561 pr_err("Invalid _PSD data\n");
562 result = -EFAULT;
563 goto end;
564 }
565
566 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
567 pr_err("Unknown _PSD:num_entries\n");
568 result = -EFAULT;
569 goto end;
570 }
571
572 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
573 pr_err("Unknown _PSD:revision\n");
574 result = -EFAULT;
575 goto end;
576 }
577
578 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
579 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
580 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
581 pr_err("Invalid _PSD:coord_type\n");
582 result = -EFAULT;
583 goto end;
584 }
585 end:
586 kfree(buffer.pointer);
587 return result;
588 }
589 EXPORT_SYMBOL(acpi_processor_get_psd);
590
acpi_processor_preregister_performance(struct acpi_processor_performance __percpu * performance)591 int acpi_processor_preregister_performance(
592 struct acpi_processor_performance __percpu *performance)
593 {
594 int count_target;
595 int retval = 0;
596 unsigned int i, j;
597 cpumask_var_t covered_cpus;
598 struct acpi_processor *pr;
599 struct acpi_psd_package *pdomain;
600 struct acpi_processor *match_pr;
601 struct acpi_psd_package *match_pdomain;
602
603 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
604 return -ENOMEM;
605
606 mutex_lock(&performance_mutex);
607
608 /*
609 * Check if another driver has already registered, and abort before
610 * changing pr->performance if it has. Check input data as well.
611 */
612 for_each_possible_cpu(i) {
613 pr = per_cpu(processors, i);
614 if (!pr) {
615 /* Look only at processors in ACPI namespace */
616 continue;
617 }
618
619 if (pr->performance) {
620 retval = -EBUSY;
621 goto err_out;
622 }
623
624 if (!performance || !per_cpu_ptr(performance, i)) {
625 retval = -EINVAL;
626 goto err_out;
627 }
628 }
629
630 /* Call _PSD for all CPUs */
631 for_each_possible_cpu(i) {
632 pr = per_cpu(processors, i);
633 if (!pr)
634 continue;
635
636 pr->performance = per_cpu_ptr(performance, i);
637 pdomain = &(pr->performance->domain_info);
638 if (acpi_processor_get_psd(pr->handle, pdomain)) {
639 retval = -EINVAL;
640 continue;
641 }
642 }
643 if (retval)
644 goto err_ret;
645
646 /*
647 * Now that we have _PSD data from all CPUs, lets setup P-state
648 * domain info.
649 */
650 for_each_possible_cpu(i) {
651 pr = per_cpu(processors, i);
652 if (!pr)
653 continue;
654
655 if (cpumask_test_cpu(i, covered_cpus))
656 continue;
657
658 pdomain = &(pr->performance->domain_info);
659 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
660 cpumask_set_cpu(i, covered_cpus);
661 if (pdomain->num_processors <= 1)
662 continue;
663
664 /* Validate the Domain info */
665 count_target = pdomain->num_processors;
666 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
667 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
668 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
669 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
670 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
671 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
672
673 for_each_possible_cpu(j) {
674 if (i == j)
675 continue;
676
677 match_pr = per_cpu(processors, j);
678 if (!match_pr)
679 continue;
680
681 match_pdomain = &(match_pr->performance->domain_info);
682 if (match_pdomain->domain != pdomain->domain)
683 continue;
684
685 /* Here i and j are in the same domain */
686
687 if (match_pdomain->num_processors != count_target) {
688 retval = -EINVAL;
689 goto err_ret;
690 }
691
692 if (pdomain->coord_type != match_pdomain->coord_type) {
693 retval = -EINVAL;
694 goto err_ret;
695 }
696
697 cpumask_set_cpu(j, covered_cpus);
698 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
699 }
700
701 for_each_possible_cpu(j) {
702 if (i == j)
703 continue;
704
705 match_pr = per_cpu(processors, j);
706 if (!match_pr)
707 continue;
708
709 match_pdomain = &(match_pr->performance->domain_info);
710 if (match_pdomain->domain != pdomain->domain)
711 continue;
712
713 match_pr->performance->shared_type =
714 pr->performance->shared_type;
715 cpumask_copy(match_pr->performance->shared_cpu_map,
716 pr->performance->shared_cpu_map);
717 }
718 }
719
720 err_ret:
721 for_each_possible_cpu(i) {
722 pr = per_cpu(processors, i);
723 if (!pr || !pr->performance)
724 continue;
725
726 /* Assume no coordination on any error parsing domain info */
727 if (retval) {
728 cpumask_clear(pr->performance->shared_cpu_map);
729 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
730 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
731 }
732 pr->performance = NULL; /* Will be set for real in register */
733 }
734
735 err_out:
736 mutex_unlock(&performance_mutex);
737 free_cpumask_var(covered_cpus);
738 return retval;
739 }
740 EXPORT_SYMBOL(acpi_processor_preregister_performance);
741
acpi_processor_register_performance(struct acpi_processor_performance * performance,unsigned int cpu)742 int acpi_processor_register_performance(struct acpi_processor_performance
743 *performance, unsigned int cpu)
744 {
745 struct acpi_processor *pr;
746
747 if (!acpi_processor_cpufreq_init)
748 return -EINVAL;
749
750 mutex_lock(&performance_mutex);
751
752 pr = per_cpu(processors, cpu);
753 if (!pr) {
754 mutex_unlock(&performance_mutex);
755 return -ENODEV;
756 }
757
758 if (pr->performance) {
759 mutex_unlock(&performance_mutex);
760 return -EBUSY;
761 }
762
763 WARN_ON(!performance);
764
765 pr->performance = performance;
766
767 if (acpi_processor_get_performance_info(pr)) {
768 pr->performance = NULL;
769 mutex_unlock(&performance_mutex);
770 return -EIO;
771 }
772
773 mutex_unlock(&performance_mutex);
774 return 0;
775 }
776 EXPORT_SYMBOL(acpi_processor_register_performance);
777
acpi_processor_unregister_performance(unsigned int cpu)778 void acpi_processor_unregister_performance(unsigned int cpu)
779 {
780 struct acpi_processor *pr;
781
782 mutex_lock(&performance_mutex);
783
784 pr = per_cpu(processors, cpu);
785 if (!pr)
786 goto unlock;
787
788 if (pr->performance)
789 kfree(pr->performance->states);
790
791 pr->performance = NULL;
792
793 unlock:
794 mutex_unlock(&performance_mutex);
795 }
796 EXPORT_SYMBOL(acpi_processor_unregister_performance);
797 #endif
798