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_CLASS "processor"
26 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
27 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
28 ACPI_MODULE_NAME("processor_perflib");
29
30 static DEFINE_MUTEX(performance_mutex);
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
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 */
48 static int ignore_ppc = -1;
49 module_param(ignore_ppc, int, 0644);
50 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
51 "limited by BIOS, this should help");
52
53 static bool acpi_processor_ppc_in_use;
54
acpi_processor_get_platform_limit(struct acpi_processor * pr)55 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
56 {
57 acpi_status status = 0;
58 unsigned long long ppc = 0;
59 s32 qos_value;
60 int index;
61 int ret;
62
63 if (!pr)
64 return -EINVAL;
65
66 /*
67 * _PPC indicates the maximum state currently supported by the platform
68 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
69 */
70 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
71
72 if (status != AE_NOT_FOUND)
73 acpi_processor_ppc_in_use = true;
74
75 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
76 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
77 return -ENODEV;
78 }
79
80 index = ppc;
81
82 if (pr->performance_platform_limit == index ||
83 ppc >= pr->performance->state_count)
84 return 0;
85
86 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
87 index, index ? "is" : "is not");
88
89 pr->performance_platform_limit = index;
90
91 if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
92 return 0;
93
94 /*
95 * If _PPC returns 0, it means that all of the available states can be
96 * used ("no limit").
97 */
98 if (index == 0)
99 qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
100 else
101 qos_value = pr->performance->states[index].core_frequency * 1000;
102
103 ret = freq_qos_update_request(&pr->perflib_req, qos_value);
104 if (ret < 0) {
105 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
106 pr->id, ret);
107 }
108
109 return 0;
110 }
111
112 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
113 /*
114 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
115 * @handle: ACPI processor handle
116 * @status: the status code of _PPC evaluation
117 * 0: success. OSPM is now using the performance state specificed.
118 * 1: failure. OSPM has not changed the number of P-states in use
119 */
acpi_processor_ppc_ost(acpi_handle handle,int status)120 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
121 {
122 if (acpi_has_method(handle, "_OST"))
123 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
124 status, NULL);
125 }
126
acpi_processor_ppc_has_changed(struct acpi_processor * pr,int event_flag)127 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
128 {
129 int ret;
130
131 if (ignore_ppc || !pr->performance) {
132 /*
133 * Only when it is notification event, the _OST object
134 * will be evaluated. Otherwise it is skipped.
135 */
136 if (event_flag)
137 acpi_processor_ppc_ost(pr->handle, 1);
138 return;
139 }
140
141 ret = acpi_processor_get_platform_limit(pr);
142 /*
143 * Only when it is notification event, the _OST object
144 * will be evaluated. Otherwise it is skipped.
145 */
146 if (event_flag) {
147 if (ret < 0)
148 acpi_processor_ppc_ost(pr->handle, 1);
149 else
150 acpi_processor_ppc_ost(pr->handle, 0);
151 }
152 if (ret >= 0)
153 cpufreq_update_limits(pr->id);
154 }
155
acpi_processor_get_bios_limit(int cpu,unsigned int * limit)156 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
157 {
158 struct acpi_processor *pr;
159
160 pr = per_cpu(processors, cpu);
161 if (!pr || !pr->performance || !pr->performance->state_count)
162 return -ENODEV;
163 *limit = pr->performance->states[pr->performance_platform_limit].
164 core_frequency * 1000;
165 return 0;
166 }
167 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
168
acpi_processor_ignore_ppc_init(void)169 void acpi_processor_ignore_ppc_init(void)
170 {
171 if (ignore_ppc < 0)
172 ignore_ppc = 0;
173 }
174
acpi_processor_ppc_init(struct cpufreq_policy * policy)175 void acpi_processor_ppc_init(struct cpufreq_policy *policy)
176 {
177 unsigned int cpu;
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 }
201
acpi_processor_ppc_exit(struct cpufreq_policy * policy)202 void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
203 {
204 unsigned int cpu;
205
206 for_each_cpu(cpu, policy->related_cpus) {
207 struct acpi_processor *pr = per_cpu(processors, cpu);
208
209 if (pr)
210 freq_qos_remove_request(&pr->perflib_req);
211 }
212 }
213
acpi_processor_get_performance_control(struct acpi_processor * pr)214 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
215 {
216 int result = 0;
217 acpi_status status = 0;
218 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
219 union acpi_object *pct = NULL;
220 union acpi_object obj = { 0 };
221
222
223 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
224 if (ACPI_FAILURE(status)) {
225 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
226 return -ENODEV;
227 }
228
229 pct = (union acpi_object *)buffer.pointer;
230 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
231 || (pct->package.count != 2)) {
232 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
233 result = -EFAULT;
234 goto end;
235 }
236
237 /*
238 * control_register
239 */
240
241 obj = pct->package.elements[0];
242
243 if ((obj.type != ACPI_TYPE_BUFFER)
244 || (obj.buffer.length < sizeof(struct acpi_pct_register))
245 || (obj.buffer.pointer == NULL)) {
246 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
247 result = -EFAULT;
248 goto end;
249 }
250 memcpy(&pr->performance->control_register, obj.buffer.pointer,
251 sizeof(struct acpi_pct_register));
252
253 /*
254 * status_register
255 */
256
257 obj = pct->package.elements[1];
258
259 if ((obj.type != ACPI_TYPE_BUFFER)
260 || (obj.buffer.length < sizeof(struct acpi_pct_register))
261 || (obj.buffer.pointer == NULL)) {
262 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
263 result = -EFAULT;
264 goto end;
265 }
266
267 memcpy(&pr->performance->status_register, obj.buffer.pointer,
268 sizeof(struct acpi_pct_register));
269
270 end:
271 kfree(buffer.pointer);
272
273 return result;
274 }
275
276 #ifdef CONFIG_X86
277 /*
278 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
279 * in their ACPI data. Calculate the real values and fix up the _PSS data.
280 */
amd_fixup_frequency(struct acpi_processor_px * px,int i)281 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
282 {
283 u32 hi, lo, fid, did;
284 int index = px->control & 0x00000007;
285
286 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
287 return;
288
289 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
290 || boot_cpu_data.x86 == 0x11) {
291 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
292 /*
293 * MSR C001_0064+:
294 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
295 */
296 if (!(hi & BIT(31)))
297 return;
298
299 fid = lo & 0x3f;
300 did = (lo >> 6) & 7;
301 if (boot_cpu_data.x86 == 0x10)
302 px->core_frequency = (100 * (fid + 0x10)) >> did;
303 else
304 px->core_frequency = (100 * (fid + 8)) >> did;
305 }
306 }
307 #else
amd_fixup_frequency(struct acpi_processor_px * px,int i)308 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
309 #endif
310
acpi_processor_get_performance_states(struct acpi_processor * pr)311 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
312 {
313 int result = 0;
314 acpi_status status = AE_OK;
315 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
316 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
317 struct acpi_buffer state = { 0, NULL };
318 union acpi_object *pss = NULL;
319 int i;
320 int last_invalid = -1;
321
322
323 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
324 if (ACPI_FAILURE(status)) {
325 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
326 return -ENODEV;
327 }
328
329 pss = buffer.pointer;
330 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
331 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
332 result = -EFAULT;
333 goto end;
334 }
335
336 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
337 pss->package.count));
338
339 pr->performance->state_count = pss->package.count;
340 pr->performance->states =
341 kmalloc_array(pss->package.count,
342 sizeof(struct acpi_processor_px),
343 GFP_KERNEL);
344 if (!pr->performance->states) {
345 result = -ENOMEM;
346 goto end;
347 }
348
349 for (i = 0; i < pr->performance->state_count; i++) {
350
351 struct acpi_processor_px *px = &(pr->performance->states[i]);
352
353 state.length = sizeof(struct acpi_processor_px);
354 state.pointer = px;
355
356 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
357
358 status = acpi_extract_package(&(pss->package.elements[i]),
359 &format, &state);
360 if (ACPI_FAILURE(status)) {
361 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
362 result = -EFAULT;
363 kfree(pr->performance->states);
364 goto end;
365 }
366
367 amd_fixup_frequency(px, i);
368
369 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
370 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
371 i,
372 (u32) px->core_frequency,
373 (u32) px->power,
374 (u32) px->transition_latency,
375 (u32) px->bus_master_latency,
376 (u32) px->control, (u32) px->status));
377
378 /*
379 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
380 */
381 if (!px->core_frequency ||
382 ((u32)(px->core_frequency * 1000) !=
383 (px->core_frequency * 1000))) {
384 printk(KERN_ERR FW_BUG PREFIX
385 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
386 pr->id, px->core_frequency);
387 if (last_invalid == -1)
388 last_invalid = i;
389 } else {
390 if (last_invalid != -1) {
391 /*
392 * Copy this valid entry over last_invalid entry
393 */
394 memcpy(&(pr->performance->states[last_invalid]),
395 px, sizeof(struct acpi_processor_px));
396 ++last_invalid;
397 }
398 }
399 }
400
401 if (last_invalid == 0) {
402 printk(KERN_ERR FW_BUG PREFIX
403 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
404 result = -EFAULT;
405 kfree(pr->performance->states);
406 pr->performance->states = NULL;
407 }
408
409 if (last_invalid > 0)
410 pr->performance->state_count = last_invalid;
411
412 end:
413 kfree(buffer.pointer);
414
415 return result;
416 }
417
acpi_processor_get_performance_info(struct acpi_processor * pr)418 int acpi_processor_get_performance_info(struct acpi_processor *pr)
419 {
420 int result = 0;
421
422 if (!pr || !pr->performance || !pr->handle)
423 return -EINVAL;
424
425 if (!acpi_has_method(pr->handle, "_PCT")) {
426 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
427 "ACPI-based processor performance control unavailable\n"));
428 return -ENODEV;
429 }
430
431 result = acpi_processor_get_performance_control(pr);
432 if (result)
433 goto update_bios;
434
435 result = acpi_processor_get_performance_states(pr);
436 if (result)
437 goto update_bios;
438
439 /* We need to call _PPC once when cpufreq starts */
440 if (ignore_ppc != 1)
441 result = acpi_processor_get_platform_limit(pr);
442
443 return result;
444
445 /*
446 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
447 * the BIOS is older than the CPU and does not know its frequencies
448 */
449 update_bios:
450 #ifdef CONFIG_X86
451 if (acpi_has_method(pr->handle, "_PPC")) {
452 if(boot_cpu_has(X86_FEATURE_EST))
453 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
454 "frequency support\n");
455 }
456 #endif
457 return result;
458 }
459 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
460
acpi_processor_pstate_control(void)461 int acpi_processor_pstate_control(void)
462 {
463 acpi_status status;
464
465 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
466 return 0;
467
468 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
469 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
470 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
471
472 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
473 (u32)acpi_gbl_FADT.pstate_control, 8);
474 if (ACPI_SUCCESS(status))
475 return 1;
476
477 ACPI_EXCEPTION((AE_INFO, status,
478 "Failed to write pstate_control [0x%x] to smi_command [0x%x]",
479 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
480 return -EIO;
481 }
482
acpi_processor_notify_smm(struct module * calling_module)483 int acpi_processor_notify_smm(struct module *calling_module)
484 {
485 static int is_done = 0;
486 int result;
487
488 if (!acpi_processor_cpufreq_init)
489 return -EBUSY;
490
491 if (!try_module_get(calling_module))
492 return -EINVAL;
493
494 /* is_done is set to negative if an error occurred,
495 * and to postitive if _no_ error occurred, but SMM
496 * was already notified. This avoids double notification
497 * which might lead to unexpected results...
498 */
499 if (is_done > 0) {
500 module_put(calling_module);
501 return 0;
502 } else if (is_done < 0) {
503 module_put(calling_module);
504 return is_done;
505 }
506
507 is_done = -EIO;
508
509 result = acpi_processor_pstate_control();
510 if (!result) {
511 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
512 module_put(calling_module);
513 return 0;
514 }
515 if (result < 0) {
516 module_put(calling_module);
517 return result;
518 }
519
520 /* Success. If there's no _PPC, we need to fear nothing, so
521 * we can allow the cpufreq driver to be rmmod'ed. */
522 is_done = 1;
523
524 if (!acpi_processor_ppc_in_use)
525 module_put(calling_module);
526
527 return 0;
528 }
529
530 EXPORT_SYMBOL(acpi_processor_notify_smm);
531
acpi_processor_get_psd(acpi_handle handle,struct acpi_psd_package * pdomain)532 int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
533 {
534 int result = 0;
535 acpi_status status = AE_OK;
536 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
537 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
538 struct acpi_buffer state = {0, NULL};
539 union acpi_object *psd = NULL;
540
541 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
542 if (ACPI_FAILURE(status)) {
543 return -ENODEV;
544 }
545
546 psd = buffer.pointer;
547 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
548 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
549 result = -EFAULT;
550 goto end;
551 }
552
553 if (psd->package.count != 1) {
554 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
555 result = -EFAULT;
556 goto end;
557 }
558
559 state.length = sizeof(struct acpi_psd_package);
560 state.pointer = pdomain;
561
562 status = acpi_extract_package(&(psd->package.elements[0]),
563 &format, &state);
564 if (ACPI_FAILURE(status)) {
565 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
566 result = -EFAULT;
567 goto end;
568 }
569
570 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
571 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
572 result = -EFAULT;
573 goto end;
574 }
575
576 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
577 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
578 result = -EFAULT;
579 goto end;
580 }
581
582 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
583 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
584 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
585 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
586 result = -EFAULT;
587 goto end;
588 }
589 end:
590 kfree(buffer.pointer);
591 return result;
592 }
593 EXPORT_SYMBOL(acpi_processor_get_psd);
594
acpi_processor_preregister_performance(struct acpi_processor_performance __percpu * performance)595 int acpi_processor_preregister_performance(
596 struct acpi_processor_performance __percpu *performance)
597 {
598 int count_target;
599 int retval = 0;
600 unsigned int i, j;
601 cpumask_var_t covered_cpus;
602 struct acpi_processor *pr;
603 struct acpi_psd_package *pdomain;
604 struct acpi_processor *match_pr;
605 struct acpi_psd_package *match_pdomain;
606
607 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
608 return -ENOMEM;
609
610 mutex_lock(&performance_mutex);
611
612 /*
613 * Check if another driver has already registered, and abort before
614 * changing pr->performance if it has. Check input data as well.
615 */
616 for_each_possible_cpu(i) {
617 pr = per_cpu(processors, i);
618 if (!pr) {
619 /* Look only at processors in ACPI namespace */
620 continue;
621 }
622
623 if (pr->performance) {
624 retval = -EBUSY;
625 goto err_out;
626 }
627
628 if (!performance || !per_cpu_ptr(performance, i)) {
629 retval = -EINVAL;
630 goto err_out;
631 }
632 }
633
634 /* Call _PSD for all CPUs */
635 for_each_possible_cpu(i) {
636 pr = per_cpu(processors, i);
637 if (!pr)
638 continue;
639
640 pr->performance = per_cpu_ptr(performance, i);
641 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
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_ALL;
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
747 int
acpi_processor_register_performance(struct acpi_processor_performance * performance,unsigned int cpu)748 acpi_processor_register_performance(struct acpi_processor_performance
749 *performance, unsigned int cpu)
750 {
751 struct acpi_processor *pr;
752
753 if (!acpi_processor_cpufreq_init)
754 return -EINVAL;
755
756 mutex_lock(&performance_mutex);
757
758 pr = per_cpu(processors, cpu);
759 if (!pr) {
760 mutex_unlock(&performance_mutex);
761 return -ENODEV;
762 }
763
764 if (pr->performance) {
765 mutex_unlock(&performance_mutex);
766 return -EBUSY;
767 }
768
769 WARN_ON(!performance);
770
771 pr->performance = performance;
772
773 if (acpi_processor_get_performance_info(pr)) {
774 pr->performance = NULL;
775 mutex_unlock(&performance_mutex);
776 return -EIO;
777 }
778
779 mutex_unlock(&performance_mutex);
780 return 0;
781 }
782
783 EXPORT_SYMBOL(acpi_processor_register_performance);
784
acpi_processor_unregister_performance(unsigned int cpu)785 void acpi_processor_unregister_performance(unsigned int cpu)
786 {
787 struct acpi_processor *pr;
788
789 mutex_lock(&performance_mutex);
790
791 pr = per_cpu(processors, cpu);
792 if (!pr) {
793 mutex_unlock(&performance_mutex);
794 return;
795 }
796
797 if (pr->performance)
798 kfree(pr->performance->states);
799 pr->performance = NULL;
800
801 mutex_unlock(&performance_mutex);
802
803 return;
804 }
805
806 EXPORT_SYMBOL(acpi_processor_unregister_performance);
807