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 #endif
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 s32 qos_value;
57 int index;
58 int ret;
59
60 if (!pr)
61 return -EINVAL;
62
63 /*
64 * _PPC indicates the maximum state currently supported by the platform
65 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
66 */
67 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
68 if (status != AE_NOT_FOUND) {
69 acpi_processor_ppc_in_use = true;
70
71 if (ACPI_FAILURE(status)) {
72 acpi_evaluation_failure_warn(pr->handle, "_PPC", status);
73 return -ENODEV;
74 }
75 }
76
77 index = ppc;
78
79 if (pr->performance_platform_limit == index ||
80 ppc >= pr->performance->state_count)
81 return 0;
82
83 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
84 index, index ? "is" : "is not");
85
86 pr->performance_platform_limit = index;
87
88 if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
89 return 0;
90
91 /*
92 * If _PPC returns 0, it means that all of the available states can be
93 * used ("no limit").
94 */
95 if (index == 0)
96 qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
97 else
98 qos_value = pr->performance->states[index].core_frequency * 1000;
99
100 ret = freq_qos_update_request(&pr->perflib_req, qos_value);
101 if (ret < 0) {
102 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
103 pr->id, ret);
104 }
105
106 return 0;
107 }
108
109 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
110 /*
111 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
112 * @handle: ACPI processor handle
113 * @status: the status code of _PPC evaluation
114 * 0: success. OSPM is now using the performance state specified.
115 * 1: failure. OSPM has not changed the number of P-states in use
116 */
acpi_processor_ppc_ost(acpi_handle handle,int status)117 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
118 {
119 if (acpi_has_method(handle, "_OST"))
120 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
121 status, NULL);
122 }
123
acpi_processor_ppc_has_changed(struct acpi_processor * pr,int event_flag)124 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
125 {
126 int ret;
127
128 if (ignore_ppc || !pr->performance) {
129 /*
130 * Only when it is notification event, the _OST object
131 * will be evaluated. Otherwise it is skipped.
132 */
133 if (event_flag)
134 acpi_processor_ppc_ost(pr->handle, 1);
135 return;
136 }
137
138 ret = acpi_processor_get_platform_limit(pr);
139 /*
140 * Only when it is notification event, the _OST object
141 * will be evaluated. Otherwise it is skipped.
142 */
143 if (event_flag) {
144 if (ret < 0)
145 acpi_processor_ppc_ost(pr->handle, 1);
146 else
147 acpi_processor_ppc_ost(pr->handle, 0);
148 }
149 if (ret >= 0)
150 cpufreq_update_limits(pr->id);
151 }
152
acpi_processor_get_bios_limit(int cpu,unsigned int * limit)153 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
154 {
155 struct acpi_processor *pr;
156
157 pr = per_cpu(processors, cpu);
158 if (!pr || !pr->performance || !pr->performance->state_count)
159 return -ENODEV;
160
161 *limit = pr->performance->states[pr->performance_platform_limit].
162 core_frequency * 1000;
163 return 0;
164 }
165 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
166
acpi_processor_ignore_ppc_init(void)167 void acpi_processor_ignore_ppc_init(void)
168 {
169 if (ignore_ppc < 0)
170 ignore_ppc = 0;
171 }
172
acpi_processor_ppc_init(struct cpufreq_policy * policy)173 void acpi_processor_ppc_init(struct cpufreq_policy *policy)
174 {
175 unsigned int cpu;
176
177 if (ignore_ppc == 1)
178 return;
179
180 for_each_cpu(cpu, policy->related_cpus) {
181 struct acpi_processor *pr = per_cpu(processors, cpu);
182 int ret;
183
184 if (!pr)
185 continue;
186
187 /*
188 * Reset performance_platform_limit in case there is a stale
189 * value in it, so as to make it match the "no limit" QoS value
190 * below.
191 */
192 pr->performance_platform_limit = 0;
193
194 ret = freq_qos_add_request(&policy->constraints,
195 &pr->perflib_req, FREQ_QOS_MAX,
196 FREQ_QOS_MAX_DEFAULT_VALUE);
197 if (ret < 0)
198 pr_err("Failed to add freq constraint for CPU%d (%d)\n",
199 cpu, ret);
200
201 if (!pr->performance)
202 continue;
203
204 ret = acpi_processor_get_platform_limit(pr);
205 if (ret)
206 pr_err("Failed to update freq constraint for CPU%d (%d)\n",
207 cpu, ret);
208 }
209 }
210
acpi_processor_ppc_exit(struct cpufreq_policy * policy)211 void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
212 {
213 unsigned int cpu;
214
215 for_each_cpu(cpu, policy->related_cpus) {
216 struct acpi_processor *pr = per_cpu(processors, cpu);
217
218 if (pr)
219 freq_qos_remove_request(&pr->perflib_req);
220 }
221 }
222
acpi_processor_get_performance_control(struct acpi_processor * pr)223 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
224 {
225 int result = 0;
226 acpi_status status = 0;
227 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
228 union acpi_object *pct = NULL;
229 union acpi_object obj = { 0 };
230
231 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
232 if (ACPI_FAILURE(status)) {
233 acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
234 return -ENODEV;
235 }
236
237 pct = (union acpi_object *)buffer.pointer;
238 if (!pct || pct->type != ACPI_TYPE_PACKAGE || pct->package.count != 2) {
239 pr_err("Invalid _PCT data\n");
240 result = -EFAULT;
241 goto end;
242 }
243
244 /*
245 * control_register
246 */
247
248 obj = pct->package.elements[0];
249
250 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
251 obj.buffer.length < sizeof(struct acpi_pct_register)) {
252 pr_err("Invalid _PCT data (control_register)\n");
253 result = -EFAULT;
254 goto end;
255 }
256 memcpy(&pr->performance->control_register, obj.buffer.pointer,
257 sizeof(struct acpi_pct_register));
258
259 /*
260 * status_register
261 */
262
263 obj = pct->package.elements[1];
264
265 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
266 obj.buffer.length < sizeof(struct acpi_pct_register)) {
267 pr_err("Invalid _PCT data (status_register)\n");
268 result = -EFAULT;
269 goto end;
270 }
271
272 memcpy(&pr->performance->status_register, obj.buffer.pointer,
273 sizeof(struct acpi_pct_register));
274
275 end:
276 kfree(buffer.pointer);
277
278 return result;
279 }
280
281 #ifdef CONFIG_X86
282 /*
283 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
284 * in their ACPI data. Calculate the real values and fix up the _PSS data.
285 */
amd_fixup_frequency(struct acpi_processor_px * px,int i)286 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
287 {
288 u32 hi, lo, fid, did;
289 int index = px->control & 0x00000007;
290
291 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
292 return;
293
294 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) ||
295 boot_cpu_data.x86 == 0x11) {
296 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
297 /*
298 * MSR C001_0064+:
299 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
300 */
301 if (!(hi & BIT(31)))
302 return;
303
304 fid = lo & 0x3f;
305 did = (lo >> 6) & 7;
306 if (boot_cpu_data.x86 == 0x10)
307 px->core_frequency = (100 * (fid + 0x10)) >> did;
308 else
309 px->core_frequency = (100 * (fid + 8)) >> did;
310 }
311 }
312 #else
amd_fixup_frequency(struct acpi_processor_px * px,int i)313 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
314 #endif
315
acpi_processor_get_performance_states(struct acpi_processor * pr)316 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
317 {
318 int result = 0;
319 acpi_status status = AE_OK;
320 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
321 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
322 struct acpi_buffer state = { 0, NULL };
323 union acpi_object *pss = NULL;
324 int i;
325 int last_invalid = -1;
326
327 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
328 if (ACPI_FAILURE(status)) {
329 acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
330 return -ENODEV;
331 }
332
333 pss = buffer.pointer;
334 if (!pss || pss->type != ACPI_TYPE_PACKAGE) {
335 pr_err("Invalid _PSS data\n");
336 result = -EFAULT;
337 goto end;
338 }
339
340 acpi_handle_debug(pr->handle, "Found %d performance states\n",
341 pss->package.count);
342
343 pr->performance->state_count = pss->package.count;
344 pr->performance->states =
345 kmalloc_array(pss->package.count,
346 sizeof(struct acpi_processor_px),
347 GFP_KERNEL);
348 if (!pr->performance->states) {
349 result = -ENOMEM;
350 goto end;
351 }
352
353 for (i = 0; i < pr->performance->state_count; i++) {
354
355 struct acpi_processor_px *px = &(pr->performance->states[i]);
356
357 state.length = sizeof(struct acpi_processor_px);
358 state.pointer = px;
359
360 acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
361
362 status = acpi_extract_package(&(pss->package.elements[i]),
363 &format, &state);
364 if (ACPI_FAILURE(status)) {
365 acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
366 acpi_format_exception(status));
367 result = -EFAULT;
368 kfree(pr->performance->states);
369 goto end;
370 }
371
372 amd_fixup_frequency(px, i);
373
374 acpi_handle_debug(pr->handle,
375 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
376 i,
377 (u32) px->core_frequency,
378 (u32) px->power,
379 (u32) px->transition_latency,
380 (u32) px->bus_master_latency,
381 (u32) px->control, (u32) px->status);
382
383 /*
384 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
385 */
386 if (!px->core_frequency ||
387 (u32)(px->core_frequency * 1000) != px->core_frequency * 1000) {
388 pr_err(FW_BUG
389 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
390 pr->id, px->core_frequency);
391 if (last_invalid == -1)
392 last_invalid = i;
393 } else {
394 if (last_invalid != -1) {
395 /*
396 * Copy this valid entry over last_invalid entry
397 */
398 memcpy(&(pr->performance->states[last_invalid]),
399 px, sizeof(struct acpi_processor_px));
400 ++last_invalid;
401 }
402 }
403 }
404
405 if (last_invalid == 0) {
406 pr_err(FW_BUG
407 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
408 result = -EFAULT;
409 kfree(pr->performance->states);
410 pr->performance->states = NULL;
411 }
412
413 if (last_invalid > 0)
414 pr->performance->state_count = last_invalid;
415
416 end:
417 kfree(buffer.pointer);
418
419 return result;
420 }
421
acpi_processor_get_performance_info(struct acpi_processor * pr)422 int acpi_processor_get_performance_info(struct acpi_processor *pr)
423 {
424 int result = 0;
425
426 if (!pr || !pr->performance || !pr->handle)
427 return -EINVAL;
428
429 if (!acpi_has_method(pr->handle, "_PCT")) {
430 acpi_handle_debug(pr->handle,
431 "ACPI-based processor performance control unavailable\n");
432 return -ENODEV;
433 }
434
435 result = acpi_processor_get_performance_control(pr);
436 if (result)
437 goto update_bios;
438
439 result = acpi_processor_get_performance_states(pr);
440 if (result)
441 goto update_bios;
442
443 /* We need to call _PPC once when cpufreq starts */
444 if (ignore_ppc != 1)
445 result = acpi_processor_get_platform_limit(pr);
446
447 return result;
448
449 /*
450 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
451 * the BIOS is older than the CPU and does not know its frequencies
452 */
453 update_bios:
454 #ifdef CONFIG_X86
455 if (acpi_has_method(pr->handle, "_PPC")) {
456 if(boot_cpu_has(X86_FEATURE_EST))
457 pr_warn(FW_BUG "BIOS needs update for CPU "
458 "frequency support\n");
459 }
460 #endif
461 return result;
462 }
463 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
464
acpi_processor_pstate_control(void)465 int acpi_processor_pstate_control(void)
466 {
467 acpi_status status;
468
469 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
470 return 0;
471
472 pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
473 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
474
475 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
476 (u32)acpi_gbl_FADT.pstate_control, 8);
477 if (ACPI_SUCCESS(status))
478 return 1;
479
480 pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
481 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
482 acpi_format_exception(status));
483 return -EIO;
484 }
485
acpi_processor_notify_smm(struct module * calling_module)486 int acpi_processor_notify_smm(struct module *calling_module)
487 {
488 static int is_done;
489 int result = 0;
490
491 if (!acpi_processor_cpufreq_init)
492 return -EBUSY;
493
494 if (!try_module_get(calling_module))
495 return -EINVAL;
496
497 /*
498 * is_done is set to negative if an error occurs and to 1 if no error
499 * occurrs, but SMM has been notified already. This avoids repeated
500 * notification which might lead to unexpected results.
501 */
502 if (is_done != 0) {
503 if (is_done < 0)
504 result = is_done;
505
506 goto out_put;
507 }
508
509 result = acpi_processor_pstate_control();
510 if (result <= 0) {
511 if (result) {
512 is_done = result;
513 } else {
514 pr_debug("No SMI port or pstate_control\n");
515 is_done = 1;
516 }
517 goto out_put;
518 }
519
520 is_done = 1;
521 /*
522 * Success. If there _PPC, unloading the cpufreq driver would be risky,
523 * so disallow it in that case.
524 */
525 if (acpi_processor_ppc_in_use)
526 return 0;
527
528 out_put:
529 module_put(calling_module);
530 return result;
531 }
532 EXPORT_SYMBOL(acpi_processor_notify_smm);
533
acpi_processor_get_psd(acpi_handle handle,struct acpi_psd_package * pdomain)534 int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
535 {
536 int result = 0;
537 acpi_status status = AE_OK;
538 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
539 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
540 struct acpi_buffer state = {0, NULL};
541 union acpi_object *psd = NULL;
542
543 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
544 if (ACPI_FAILURE(status)) {
545 return -ENODEV;
546 }
547
548 psd = buffer.pointer;
549 if (!psd || psd->type != ACPI_TYPE_PACKAGE) {
550 pr_err("Invalid _PSD data\n");
551 result = -EFAULT;
552 goto end;
553 }
554
555 if (psd->package.count != 1) {
556 pr_err("Invalid _PSD data\n");
557 result = -EFAULT;
558 goto end;
559 }
560
561 state.length = sizeof(struct acpi_psd_package);
562 state.pointer = pdomain;
563
564 status = acpi_extract_package(&(psd->package.elements[0]), &format, &state);
565 if (ACPI_FAILURE(status)) {
566 pr_err("Invalid _PSD data\n");
567 result = -EFAULT;
568 goto end;
569 }
570
571 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
572 pr_err("Unknown _PSD:num_entries\n");
573 result = -EFAULT;
574 goto end;
575 }
576
577 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
578 pr_err("Unknown _PSD:revision\n");
579 result = -EFAULT;
580 goto end;
581 }
582
583 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
584 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
585 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
586 pr_err("Invalid _PSD:coord_type\n");
587 result = -EFAULT;
588 goto end;
589 }
590 end:
591 kfree(buffer.pointer);
592 return result;
593 }
594 EXPORT_SYMBOL(acpi_processor_get_psd);
595
acpi_processor_preregister_performance(struct acpi_processor_performance __percpu * performance)596 int acpi_processor_preregister_performance(
597 struct acpi_processor_performance __percpu *performance)
598 {
599 int count_target;
600 int retval = 0;
601 unsigned int i, j;
602 cpumask_var_t covered_cpus;
603 struct acpi_processor *pr;
604 struct acpi_psd_package *pdomain;
605 struct acpi_processor *match_pr;
606 struct acpi_psd_package *match_pdomain;
607
608 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
609 return -ENOMEM;
610
611 mutex_lock(&performance_mutex);
612
613 /*
614 * Check if another driver has already registered, and abort before
615 * changing pr->performance if it has. Check input data as well.
616 */
617 for_each_possible_cpu(i) {
618 pr = per_cpu(processors, i);
619 if (!pr) {
620 /* Look only at processors in ACPI namespace */
621 continue;
622 }
623
624 if (pr->performance) {
625 retval = -EBUSY;
626 goto err_out;
627 }
628
629 if (!performance || !per_cpu_ptr(performance, i)) {
630 retval = -EINVAL;
631 goto err_out;
632 }
633 }
634
635 /* Call _PSD for all CPUs */
636 for_each_possible_cpu(i) {
637 pr = per_cpu(processors, i);
638 if (!pr)
639 continue;
640
641 pr->performance = per_cpu_ptr(performance, i);
642 pdomain = &(pr->performance->domain_info);
643 if (acpi_processor_get_psd(pr->handle, pdomain)) {
644 retval = -EINVAL;
645 continue;
646 }
647 }
648 if (retval)
649 goto err_ret;
650
651 /*
652 * Now that we have _PSD data from all CPUs, lets setup P-state
653 * domain info.
654 */
655 for_each_possible_cpu(i) {
656 pr = per_cpu(processors, i);
657 if (!pr)
658 continue;
659
660 if (cpumask_test_cpu(i, covered_cpus))
661 continue;
662
663 pdomain = &(pr->performance->domain_info);
664 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
665 cpumask_set_cpu(i, covered_cpus);
666 if (pdomain->num_processors <= 1)
667 continue;
668
669 /* Validate the Domain info */
670 count_target = pdomain->num_processors;
671 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
672 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
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)
676 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
677
678 for_each_possible_cpu(j) {
679 if (i == j)
680 continue;
681
682 match_pr = per_cpu(processors, j);
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 cpumask_set_cpu(j, covered_cpus);
703 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
704 }
705
706 for_each_possible_cpu(j) {
707 if (i == j)
708 continue;
709
710 match_pr = per_cpu(processors, j);
711 if (!match_pr)
712 continue;
713
714 match_pdomain = &(match_pr->performance->domain_info);
715 if (match_pdomain->domain != pdomain->domain)
716 continue;
717
718 match_pr->performance->shared_type =
719 pr->performance->shared_type;
720 cpumask_copy(match_pr->performance->shared_cpu_map,
721 pr->performance->shared_cpu_map);
722 }
723 }
724
725 err_ret:
726 for_each_possible_cpu(i) {
727 pr = per_cpu(processors, i);
728 if (!pr || !pr->performance)
729 continue;
730
731 /* Assume no coordination on any error parsing domain info */
732 if (retval) {
733 cpumask_clear(pr->performance->shared_cpu_map);
734 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
735 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
736 }
737 pr->performance = NULL; /* Will be set for real in register */
738 }
739
740 err_out:
741 mutex_unlock(&performance_mutex);
742 free_cpumask_var(covered_cpus);
743 return retval;
744 }
745 EXPORT_SYMBOL(acpi_processor_preregister_performance);
746
acpi_processor_register_performance(struct acpi_processor_performance * performance,unsigned int cpu)747 int acpi_processor_register_performance(struct acpi_processor_performance
748 *performance, unsigned int cpu)
749 {
750 struct acpi_processor *pr;
751
752 if (!acpi_processor_cpufreq_init)
753 return -EINVAL;
754
755 mutex_lock(&performance_mutex);
756
757 pr = per_cpu(processors, cpu);
758 if (!pr) {
759 mutex_unlock(&performance_mutex);
760 return -ENODEV;
761 }
762
763 if (pr->performance) {
764 mutex_unlock(&performance_mutex);
765 return -EBUSY;
766 }
767
768 WARN_ON(!performance);
769
770 pr->performance = performance;
771
772 if (acpi_processor_get_performance_info(pr)) {
773 pr->performance = NULL;
774 mutex_unlock(&performance_mutex);
775 return -EIO;
776 }
777
778 mutex_unlock(&performance_mutex);
779 return 0;
780 }
781 EXPORT_SYMBOL(acpi_processor_register_performance);
782
acpi_processor_unregister_performance(unsigned int cpu)783 void acpi_processor_unregister_performance(unsigned int cpu)
784 {
785 struct acpi_processor *pr;
786
787 mutex_lock(&performance_mutex);
788
789 pr = per_cpu(processors, cpu);
790 if (!pr)
791 goto unlock;
792
793 if (pr->performance)
794 kfree(pr->performance->states);
795
796 pr->performance = NULL;
797
798 unlock:
799 mutex_unlock(&performance_mutex);
800 }
801 EXPORT_SYMBOL(acpi_processor_unregister_performance);
802