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arm64: Distinguish between user and kernel XN bits
[deliverable/linux.git] / drivers / acpi / processor_perflib.c
1 /*
2 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8 * - Added processor hotplug support
9 *
10 *
11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or (at
16 * your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 *
27 */
28
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/cpufreq.h>
33 #include <linux/slab.h>
34
35 #ifdef CONFIG_X86
36 #include <asm/cpufeature.h>
37 #endif
38
39 #include <acpi/acpi_bus.h>
40 #include <acpi/acpi_drivers.h>
41 #include <acpi/processor.h>
42
43 #define PREFIX "ACPI: "
44
45 #define ACPI_PROCESSOR_CLASS "processor"
46 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
47 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
48 ACPI_MODULE_NAME("processor_perflib");
49
50 static DEFINE_MUTEX(performance_mutex);
51
52 /*
53 * _PPC support is implemented as a CPUfreq policy notifier:
54 * This means each time a CPUfreq driver registered also with
55 * the ACPI core is asked to change the speed policy, the maximum
56 * value is adjusted so that it is within the platform limit.
57 *
58 * Also, when a new platform limit value is detected, the CPUfreq
59 * policy is adjusted accordingly.
60 */
61
62 /* ignore_ppc:
63 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
64 * ignore _PPC
65 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
66 * 1 -> ignore _PPC totally -> forced by user through boot param
67 */
68 static int ignore_ppc = -1;
69 module_param(ignore_ppc, int, 0644);
70 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
71 "limited by BIOS, this should help");
72
73 #define PPC_REGISTERED 1
74 #define PPC_IN_USE 2
75
76 static int acpi_processor_ppc_status;
77
78 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
79 unsigned long event, void *data)
80 {
81 struct cpufreq_policy *policy = data;
82 struct acpi_processor *pr;
83 unsigned int ppc = 0;
84
85 if (event == CPUFREQ_START && ignore_ppc <= 0) {
86 ignore_ppc = 0;
87 return 0;
88 }
89
90 if (ignore_ppc)
91 return 0;
92
93 if (event != CPUFREQ_INCOMPATIBLE)
94 return 0;
95
96 mutex_lock(&performance_mutex);
97
98 pr = per_cpu(processors, policy->cpu);
99 if (!pr || !pr->performance)
100 goto out;
101
102 ppc = (unsigned int)pr->performance_platform_limit;
103
104 if (ppc >= pr->performance->state_count)
105 goto out;
106
107 cpufreq_verify_within_limits(policy, 0,
108 pr->performance->states[ppc].
109 core_frequency * 1000);
110
111 out:
112 mutex_unlock(&performance_mutex);
113
114 return 0;
115 }
116
117 static struct notifier_block acpi_ppc_notifier_block = {
118 .notifier_call = acpi_processor_ppc_notifier,
119 };
120
121 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
122 {
123 acpi_status status = 0;
124 unsigned long long ppc = 0;
125
126
127 if (!pr)
128 return -EINVAL;
129
130 /*
131 * _PPC indicates the maximum state currently supported by the platform
132 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
133 */
134 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
135
136 if (status != AE_NOT_FOUND)
137 acpi_processor_ppc_status |= PPC_IN_USE;
138
139 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
140 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
141 return -ENODEV;
142 }
143
144 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
145 (int)ppc, ppc ? "" : "not");
146
147 pr->performance_platform_limit = (int)ppc;
148
149 return 0;
150 }
151
152 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
153 /*
154 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
155 * @handle: ACPI processor handle
156 * @status: the status code of _PPC evaluation
157 * 0: success. OSPM is now using the performance state specificed.
158 * 1: failure. OSPM has not changed the number of P-states in use
159 */
160 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
161 {
162 union acpi_object params[2] = {
163 {.type = ACPI_TYPE_INTEGER,},
164 {.type = ACPI_TYPE_INTEGER,},
165 };
166 struct acpi_object_list arg_list = {2, params};
167 acpi_handle temp;
168
169 params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
170 params[1].integer.value = status;
171
172 /* when there is no _OST , skip it */
173 if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))
174 return;
175
176 acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
177 return;
178 }
179
180 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
181 {
182 int ret;
183
184 if (ignore_ppc) {
185 /*
186 * Only when it is notification event, the _OST object
187 * will be evaluated. Otherwise it is skipped.
188 */
189 if (event_flag)
190 acpi_processor_ppc_ost(pr->handle, 1);
191 return 0;
192 }
193
194 ret = acpi_processor_get_platform_limit(pr);
195 /*
196 * Only when it is notification event, the _OST object
197 * will be evaluated. Otherwise it is skipped.
198 */
199 if (event_flag) {
200 if (ret < 0)
201 acpi_processor_ppc_ost(pr->handle, 1);
202 else
203 acpi_processor_ppc_ost(pr->handle, 0);
204 }
205 if (ret < 0)
206 return (ret);
207 else
208 return cpufreq_update_policy(pr->id);
209 }
210
211 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
212 {
213 struct acpi_processor *pr;
214
215 pr = per_cpu(processors, cpu);
216 if (!pr || !pr->performance || !pr->performance->state_count)
217 return -ENODEV;
218 *limit = pr->performance->states[pr->performance_platform_limit].
219 core_frequency * 1000;
220 return 0;
221 }
222 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
223
224 void acpi_processor_ppc_init(void)
225 {
226 if (!cpufreq_register_notifier
227 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
228 acpi_processor_ppc_status |= PPC_REGISTERED;
229 else
230 printk(KERN_DEBUG
231 "Warning: Processor Platform Limit not supported.\n");
232 }
233
234 void acpi_processor_ppc_exit(void)
235 {
236 if (acpi_processor_ppc_status & PPC_REGISTERED)
237 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
238 CPUFREQ_POLICY_NOTIFIER);
239
240 acpi_processor_ppc_status &= ~PPC_REGISTERED;
241 }
242
243 /*
244 * Do a quick check if the systems looks like it should use ACPI
245 * cpufreq. We look at a _PCT method being available, but don't
246 * do a whole lot of sanity checks.
247 */
248 void acpi_processor_load_module(struct acpi_processor *pr)
249 {
250 static int requested;
251 acpi_status status = 0;
252 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
253
254 if (!arch_has_acpi_pdc() || requested)
255 return;
256 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
257 if (!ACPI_FAILURE(status)) {
258 printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n");
259 request_module_nowait("acpi_cpufreq");
260 requested = 1;
261 }
262 kfree(buffer.pointer);
263 }
264
265 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
266 {
267 int result = 0;
268 acpi_status status = 0;
269 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
270 union acpi_object *pct = NULL;
271 union acpi_object obj = { 0 };
272
273
274 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
275 if (ACPI_FAILURE(status)) {
276 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
277 return -ENODEV;
278 }
279
280 pct = (union acpi_object *)buffer.pointer;
281 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
282 || (pct->package.count != 2)) {
283 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
284 result = -EFAULT;
285 goto end;
286 }
287
288 /*
289 * control_register
290 */
291
292 obj = pct->package.elements[0];
293
294 if ((obj.type != ACPI_TYPE_BUFFER)
295 || (obj.buffer.length < sizeof(struct acpi_pct_register))
296 || (obj.buffer.pointer == NULL)) {
297 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
298 result = -EFAULT;
299 goto end;
300 }
301 memcpy(&pr->performance->control_register, obj.buffer.pointer,
302 sizeof(struct acpi_pct_register));
303
304 /*
305 * status_register
306 */
307
308 obj = pct->package.elements[1];
309
310 if ((obj.type != ACPI_TYPE_BUFFER)
311 || (obj.buffer.length < sizeof(struct acpi_pct_register))
312 || (obj.buffer.pointer == NULL)) {
313 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
314 result = -EFAULT;
315 goto end;
316 }
317
318 memcpy(&pr->performance->status_register, obj.buffer.pointer,
319 sizeof(struct acpi_pct_register));
320
321 end:
322 kfree(buffer.pointer);
323
324 return result;
325 }
326
327 #ifdef CONFIG_X86
328 /*
329 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
330 * in their ACPI data. Calculate the real values and fix up the _PSS data.
331 */
332 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
333 {
334 u32 hi, lo, fid, did;
335 int index = px->control & 0x00000007;
336
337 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
338 return;
339
340 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
341 || boot_cpu_data.x86 == 0x11) {
342 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
343 fid = lo & 0x3f;
344 did = (lo >> 6) & 7;
345 if (boot_cpu_data.x86 == 0x10)
346 px->core_frequency = (100 * (fid + 0x10)) >> did;
347 else
348 px->core_frequency = (100 * (fid + 8)) >> did;
349 }
350 }
351 #else
352 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
353 #endif
354
355 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
356 {
357 int result = 0;
358 acpi_status status = AE_OK;
359 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
360 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
361 struct acpi_buffer state = { 0, NULL };
362 union acpi_object *pss = NULL;
363 int i;
364 int last_invalid = -1;
365
366
367 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
368 if (ACPI_FAILURE(status)) {
369 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
370 return -ENODEV;
371 }
372
373 pss = buffer.pointer;
374 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
375 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
376 result = -EFAULT;
377 goto end;
378 }
379
380 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
381 pss->package.count));
382
383 pr->performance->state_count = pss->package.count;
384 pr->performance->states =
385 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
386 GFP_KERNEL);
387 if (!pr->performance->states) {
388 result = -ENOMEM;
389 goto end;
390 }
391
392 for (i = 0; i < pr->performance->state_count; i++) {
393
394 struct acpi_processor_px *px = &(pr->performance->states[i]);
395
396 state.length = sizeof(struct acpi_processor_px);
397 state.pointer = px;
398
399 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
400
401 status = acpi_extract_package(&(pss->package.elements[i]),
402 &format, &state);
403 if (ACPI_FAILURE(status)) {
404 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
405 result = -EFAULT;
406 kfree(pr->performance->states);
407 goto end;
408 }
409
410 amd_fixup_frequency(px, i);
411
412 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
413 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
414 i,
415 (u32) px->core_frequency,
416 (u32) px->power,
417 (u32) px->transition_latency,
418 (u32) px->bus_master_latency,
419 (u32) px->control, (u32) px->status));
420
421 /*
422 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
423 */
424 if (!px->core_frequency ||
425 ((u32)(px->core_frequency * 1000) !=
426 (px->core_frequency * 1000))) {
427 printk(KERN_ERR FW_BUG PREFIX
428 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
429 pr->id, px->core_frequency);
430 if (last_invalid == -1)
431 last_invalid = i;
432 } else {
433 if (last_invalid != -1) {
434 /*
435 * Copy this valid entry over last_invalid entry
436 */
437 memcpy(&(pr->performance->states[last_invalid]),
438 px, sizeof(struct acpi_processor_px));
439 ++last_invalid;
440 }
441 }
442 }
443
444 if (last_invalid == 0) {
445 printk(KERN_ERR FW_BUG PREFIX
446 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
447 result = -EFAULT;
448 kfree(pr->performance->states);
449 pr->performance->states = NULL;
450 }
451
452 if (last_invalid > 0)
453 pr->performance->state_count = last_invalid;
454
455 end:
456 kfree(buffer.pointer);
457
458 return result;
459 }
460
461 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
462 {
463 int result = 0;
464 acpi_status status = AE_OK;
465 acpi_handle handle = NULL;
466
467 if (!pr || !pr->performance || !pr->handle)
468 return -EINVAL;
469
470 status = acpi_get_handle(pr->handle, "_PCT", &handle);
471 if (ACPI_FAILURE(status)) {
472 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
473 "ACPI-based processor performance control unavailable\n"));
474 return -ENODEV;
475 }
476
477 result = acpi_processor_get_performance_control(pr);
478 if (result)
479 goto update_bios;
480
481 result = acpi_processor_get_performance_states(pr);
482 if (result)
483 goto update_bios;
484
485 /* We need to call _PPC once when cpufreq starts */
486 if (ignore_ppc != 1)
487 result = acpi_processor_get_platform_limit(pr);
488
489 return result;
490
491 /*
492 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
493 * the BIOS is older than the CPU and does not know its frequencies
494 */
495 update_bios:
496 #ifdef CONFIG_X86
497 if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
498 if(boot_cpu_has(X86_FEATURE_EST))
499 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
500 "frequency support\n");
501 }
502 #endif
503 return result;
504 }
505
506 int acpi_processor_notify_smm(struct module *calling_module)
507 {
508 acpi_status status;
509 static int is_done = 0;
510
511
512 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
513 return -EBUSY;
514
515 if (!try_module_get(calling_module))
516 return -EINVAL;
517
518 /* is_done is set to negative if an error occurred,
519 * and to postitive if _no_ error occurred, but SMM
520 * was already notified. This avoids double notification
521 * which might lead to unexpected results...
522 */
523 if (is_done > 0) {
524 module_put(calling_module);
525 return 0;
526 } else if (is_done < 0) {
527 module_put(calling_module);
528 return is_done;
529 }
530
531 is_done = -EIO;
532
533 /* Can't write pstate_control to smi_command if either value is zero */
534 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
535 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
536 module_put(calling_module);
537 return 0;
538 }
539
540 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
541 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
542 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
543
544 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
545 (u32) acpi_gbl_FADT.pstate_control, 8);
546 if (ACPI_FAILURE(status)) {
547 ACPI_EXCEPTION((AE_INFO, status,
548 "Failed to write pstate_control [0x%x] to "
549 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
550 acpi_gbl_FADT.smi_command));
551 module_put(calling_module);
552 return status;
553 }
554
555 /* Success. If there's no _PPC, we need to fear nothing, so
556 * we can allow the cpufreq driver to be rmmod'ed. */
557 is_done = 1;
558
559 if (!(acpi_processor_ppc_status & PPC_IN_USE))
560 module_put(calling_module);
561
562 return 0;
563 }
564
565 EXPORT_SYMBOL(acpi_processor_notify_smm);
566
567 static int acpi_processor_get_psd(struct acpi_processor *pr)
568 {
569 int result = 0;
570 acpi_status status = AE_OK;
571 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
572 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
573 struct acpi_buffer state = {0, NULL};
574 union acpi_object *psd = NULL;
575 struct acpi_psd_package *pdomain;
576
577 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
578 if (ACPI_FAILURE(status)) {
579 return -ENODEV;
580 }
581
582 psd = buffer.pointer;
583 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
584 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
585 result = -EFAULT;
586 goto end;
587 }
588
589 if (psd->package.count != 1) {
590 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
591 result = -EFAULT;
592 goto end;
593 }
594
595 pdomain = &(pr->performance->domain_info);
596
597 state.length = sizeof(struct acpi_psd_package);
598 state.pointer = pdomain;
599
600 status = acpi_extract_package(&(psd->package.elements[0]),
601 &format, &state);
602 if (ACPI_FAILURE(status)) {
603 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
604 result = -EFAULT;
605 goto end;
606 }
607
608 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
609 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
610 result = -EFAULT;
611 goto end;
612 }
613
614 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
615 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
616 result = -EFAULT;
617 goto end;
618 }
619
620 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
621 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
622 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
623 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
624 result = -EFAULT;
625 goto end;
626 }
627 end:
628 kfree(buffer.pointer);
629 return result;
630 }
631
632 int acpi_processor_preregister_performance(
633 struct acpi_processor_performance __percpu *performance)
634 {
635 int count, count_target;
636 int retval = 0;
637 unsigned int i, j;
638 cpumask_var_t covered_cpus;
639 struct acpi_processor *pr;
640 struct acpi_psd_package *pdomain;
641 struct acpi_processor *match_pr;
642 struct acpi_psd_package *match_pdomain;
643
644 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
645 return -ENOMEM;
646
647 mutex_lock(&performance_mutex);
648
649 /*
650 * Check if another driver has already registered, and abort before
651 * changing pr->performance if it has. Check input data as well.
652 */
653 for_each_possible_cpu(i) {
654 pr = per_cpu(processors, i);
655 if (!pr) {
656 /* Look only at processors in ACPI namespace */
657 continue;
658 }
659
660 if (pr->performance) {
661 retval = -EBUSY;
662 goto err_out;
663 }
664
665 if (!performance || !per_cpu_ptr(performance, i)) {
666 retval = -EINVAL;
667 goto err_out;
668 }
669 }
670
671 /* Call _PSD for all CPUs */
672 for_each_possible_cpu(i) {
673 pr = per_cpu(processors, i);
674 if (!pr)
675 continue;
676
677 pr->performance = per_cpu_ptr(performance, i);
678 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
679 if (acpi_processor_get_psd(pr)) {
680 retval = -EINVAL;
681 continue;
682 }
683 }
684 if (retval)
685 goto err_ret;
686
687 /*
688 * Now that we have _PSD data from all CPUs, lets setup P-state
689 * domain info.
690 */
691 for_each_possible_cpu(i) {
692 pr = per_cpu(processors, i);
693 if (!pr)
694 continue;
695
696 if (cpumask_test_cpu(i, covered_cpus))
697 continue;
698
699 pdomain = &(pr->performance->domain_info);
700 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
701 cpumask_set_cpu(i, covered_cpus);
702 if (pdomain->num_processors <= 1)
703 continue;
704
705 /* Validate the Domain info */
706 count_target = pdomain->num_processors;
707 count = 1;
708 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
709 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
710 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
711 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
712 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
713 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
714
715 for_each_possible_cpu(j) {
716 if (i == j)
717 continue;
718
719 match_pr = per_cpu(processors, j);
720 if (!match_pr)
721 continue;
722
723 match_pdomain = &(match_pr->performance->domain_info);
724 if (match_pdomain->domain != pdomain->domain)
725 continue;
726
727 /* Here i and j are in the same domain */
728
729 if (match_pdomain->num_processors != count_target) {
730 retval = -EINVAL;
731 goto err_ret;
732 }
733
734 if (pdomain->coord_type != match_pdomain->coord_type) {
735 retval = -EINVAL;
736 goto err_ret;
737 }
738
739 cpumask_set_cpu(j, covered_cpus);
740 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
741 count++;
742 }
743
744 for_each_possible_cpu(j) {
745 if (i == j)
746 continue;
747
748 match_pr = per_cpu(processors, j);
749 if (!match_pr)
750 continue;
751
752 match_pdomain = &(match_pr->performance->domain_info);
753 if (match_pdomain->domain != pdomain->domain)
754 continue;
755
756 match_pr->performance->shared_type =
757 pr->performance->shared_type;
758 cpumask_copy(match_pr->performance->shared_cpu_map,
759 pr->performance->shared_cpu_map);
760 }
761 }
762
763 err_ret:
764 for_each_possible_cpu(i) {
765 pr = per_cpu(processors, i);
766 if (!pr || !pr->performance)
767 continue;
768
769 /* Assume no coordination on any error parsing domain info */
770 if (retval) {
771 cpumask_clear(pr->performance->shared_cpu_map);
772 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
773 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
774 }
775 pr->performance = NULL; /* Will be set for real in register */
776 }
777
778 err_out:
779 mutex_unlock(&performance_mutex);
780 free_cpumask_var(covered_cpus);
781 return retval;
782 }
783 EXPORT_SYMBOL(acpi_processor_preregister_performance);
784
785 int
786 acpi_processor_register_performance(struct acpi_processor_performance
787 *performance, unsigned int cpu)
788 {
789 struct acpi_processor *pr;
790
791 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
792 return -EINVAL;
793
794 mutex_lock(&performance_mutex);
795
796 pr = per_cpu(processors, cpu);
797 if (!pr) {
798 mutex_unlock(&performance_mutex);
799 return -ENODEV;
800 }
801
802 if (pr->performance) {
803 mutex_unlock(&performance_mutex);
804 return -EBUSY;
805 }
806
807 WARN_ON(!performance);
808
809 pr->performance = performance;
810
811 if (acpi_processor_get_performance_info(pr)) {
812 pr->performance = NULL;
813 mutex_unlock(&performance_mutex);
814 return -EIO;
815 }
816
817 mutex_unlock(&performance_mutex);
818 return 0;
819 }
820
821 EXPORT_SYMBOL(acpi_processor_register_performance);
822
823 void
824 acpi_processor_unregister_performance(struct acpi_processor_performance
825 *performance, unsigned int cpu)
826 {
827 struct acpi_processor *pr;
828
829 mutex_lock(&performance_mutex);
830
831 pr = per_cpu(processors, cpu);
832 if (!pr) {
833 mutex_unlock(&performance_mutex);
834 return;
835 }
836
837 if (pr->performance)
838 kfree(pr->performance->states);
839 pr->performance = NULL;
840
841 mutex_unlock(&performance_mutex);
842
843 return;
844 }
845
846 EXPORT_SYMBOL(acpi_processor_unregister_performance);
Linux kernel - Deliverables
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