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