2 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
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
11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/cpufreq.h>
34 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
35 #include <linux/proc_fs.h>
36 #include <linux/seq_file.h>
37 #include <linux/mutex.h>
39 #include <asm/uaccess.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/processor.h>
45 #define ACPI_PROCESSOR_COMPONENT 0x01000000
46 #define ACPI_PROCESSOR_CLASS "processor"
47 #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
48 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
49 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
50 ACPI_MODULE_NAME("acpi_processor")
52 static DEFINE_MUTEX(performance_mutex
);
55 * _PPC support is implemented as a CPUfreq policy notifier:
56 * This means each time a CPUfreq driver registered also with
57 * the ACPI core is asked to change the speed policy, the maximum
58 * value is adjusted so that it is within the platform limit.
60 * Also, when a new platform limit value is detected, the CPUfreq
61 * policy is adjusted accordingly.
64 #define PPC_REGISTERED 1
67 static int acpi_processor_ppc_status
= 0;
69 static int acpi_processor_ppc_notifier(struct notifier_block
*nb
,
70 unsigned long event
, void *data
)
72 struct cpufreq_policy
*policy
= data
;
73 struct acpi_processor
*pr
;
76 mutex_lock(&performance_mutex
);
78 if (event
!= CPUFREQ_INCOMPATIBLE
)
81 pr
= processors
[policy
->cpu
];
82 if (!pr
|| !pr
->performance
)
85 ppc
= (unsigned int)pr
->performance_platform_limit
;
89 if (ppc
> pr
->performance
->state_count
)
92 cpufreq_verify_within_limits(policy
, 0,
93 pr
->performance
->states
[ppc
].
94 core_frequency
* 1000);
97 mutex_unlock(&performance_mutex
);
102 static struct notifier_block acpi_ppc_notifier_block
= {
103 .notifier_call
= acpi_processor_ppc_notifier
,
106 static int acpi_processor_get_platform_limit(struct acpi_processor
*pr
)
108 acpi_status status
= 0;
109 unsigned long ppc
= 0;
111 ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit");
114 return_VALUE(-EINVAL
);
117 * _PPC indicates the maximum state currently supported by the platform
118 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
120 status
= acpi_evaluate_integer(pr
->handle
, "_PPC", NULL
, &ppc
);
122 if (status
!= AE_NOT_FOUND
)
123 acpi_processor_ppc_status
|= PPC_IN_USE
;
125 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
126 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error evaluating _PPC\n"));
127 return_VALUE(-ENODEV
);
130 pr
->performance_platform_limit
= (int)ppc
;
135 int acpi_processor_ppc_has_changed(struct acpi_processor
*pr
)
137 int ret
= acpi_processor_get_platform_limit(pr
);
141 return cpufreq_update_policy(pr
->id
);
144 void acpi_processor_ppc_init(void)
146 if (!cpufreq_register_notifier
147 (&acpi_ppc_notifier_block
, CPUFREQ_POLICY_NOTIFIER
))
148 acpi_processor_ppc_status
|= PPC_REGISTERED
;
151 "Warning: Processor Platform Limit not supported.\n");
154 void acpi_processor_ppc_exit(void)
156 if (acpi_processor_ppc_status
& PPC_REGISTERED
)
157 cpufreq_unregister_notifier(&acpi_ppc_notifier_block
,
158 CPUFREQ_POLICY_NOTIFIER
);
160 acpi_processor_ppc_status
&= ~PPC_REGISTERED
;
163 static int acpi_processor_get_performance_control(struct acpi_processor
*pr
)
166 acpi_status status
= 0;
167 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
168 union acpi_object
*pct
= NULL
;
169 union acpi_object obj
= { 0 };
171 ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control");
173 status
= acpi_evaluate_object(pr
->handle
, "_PCT", NULL
, &buffer
);
174 if (ACPI_FAILURE(status
)) {
175 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error evaluating _PCT\n"));
176 return_VALUE(-ENODEV
);
179 pct
= (union acpi_object
*)buffer
.pointer
;
180 if (!pct
|| (pct
->type
!= ACPI_TYPE_PACKAGE
)
181 || (pct
->package
.count
!= 2)) {
182 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid _PCT data\n"));
191 obj
= pct
->package
.elements
[0];
193 if ((obj
.type
!= ACPI_TYPE_BUFFER
)
194 || (obj
.buffer
.length
< sizeof(struct acpi_pct_register
))
195 || (obj
.buffer
.pointer
== NULL
)) {
196 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
197 "Invalid _PCT data (control_register)\n"));
201 memcpy(&pr
->performance
->control_register
, obj
.buffer
.pointer
,
202 sizeof(struct acpi_pct_register
));
208 obj
= pct
->package
.elements
[1];
210 if ((obj
.type
!= ACPI_TYPE_BUFFER
)
211 || (obj
.buffer
.length
< sizeof(struct acpi_pct_register
))
212 || (obj
.buffer
.pointer
== NULL
)) {
213 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
214 "Invalid _PCT data (status_register)\n"));
219 memcpy(&pr
->performance
->status_register
, obj
.buffer
.pointer
,
220 sizeof(struct acpi_pct_register
));
223 acpi_os_free(buffer
.pointer
);
225 return_VALUE(result
);
228 static int acpi_processor_get_performance_states(struct acpi_processor
*pr
)
231 acpi_status status
= AE_OK
;
232 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
233 struct acpi_buffer format
= { sizeof("NNNNNN"), "NNNNNN" };
234 struct acpi_buffer state
= { 0, NULL
};
235 union acpi_object
*pss
= NULL
;
238 ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states");
240 status
= acpi_evaluate_object(pr
->handle
, "_PSS", NULL
, &buffer
);
241 if (ACPI_FAILURE(status
)) {
242 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error evaluating _PSS\n"));
243 return_VALUE(-ENODEV
);
246 pss
= (union acpi_object
*)buffer
.pointer
;
247 if (!pss
|| (pss
->type
!= ACPI_TYPE_PACKAGE
)) {
248 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid _PSS data\n"));
253 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d performance states\n",
254 pss
->package
.count
));
256 pr
->performance
->state_count
= pss
->package
.count
;
257 pr
->performance
->states
=
258 kmalloc(sizeof(struct acpi_processor_px
) * pss
->package
.count
,
260 if (!pr
->performance
->states
) {
265 for (i
= 0; i
< pr
->performance
->state_count
; i
++) {
267 struct acpi_processor_px
*px
= &(pr
->performance
->states
[i
]);
269 state
.length
= sizeof(struct acpi_processor_px
);
272 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Extracting state %d\n", i
));
274 status
= acpi_extract_package(&(pss
->package
.elements
[i
]),
276 if (ACPI_FAILURE(status
)) {
277 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
278 "Invalid _PSS data\n"));
280 kfree(pr
->performance
->states
);
284 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
285 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
287 (u32
) px
->core_frequency
,
289 (u32
) px
->transition_latency
,
290 (u32
) px
->bus_master_latency
,
291 (u32
) px
->control
, (u32
) px
->status
));
293 if (!px
->core_frequency
) {
294 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
295 "Invalid _PSS data: freq is zero\n"));
297 kfree(pr
->performance
->states
);
303 acpi_os_free(buffer
.pointer
);
305 return_VALUE(result
);
308 static int acpi_processor_get_performance_info(struct acpi_processor
*pr
)
311 acpi_status status
= AE_OK
;
312 acpi_handle handle
= NULL
;
314 ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info");
316 if (!pr
|| !pr
->performance
|| !pr
->handle
)
317 return_VALUE(-EINVAL
);
319 status
= acpi_get_handle(pr
->handle
, "_PCT", &handle
);
320 if (ACPI_FAILURE(status
)) {
321 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
322 "ACPI-based processor performance control unavailable\n"));
323 return_VALUE(-ENODEV
);
326 result
= acpi_processor_get_performance_control(pr
);
328 return_VALUE(result
);
330 result
= acpi_processor_get_performance_states(pr
);
332 return_VALUE(result
);
334 result
= acpi_processor_get_platform_limit(pr
);
336 return_VALUE(result
);
341 int acpi_processor_notify_smm(struct module
*calling_module
)
344 static int is_done
= 0;
346 ACPI_FUNCTION_TRACE("acpi_processor_notify_smm");
348 if (!(acpi_processor_ppc_status
& PPC_REGISTERED
))
349 return_VALUE(-EBUSY
);
351 if (!try_module_get(calling_module
))
352 return_VALUE(-EINVAL
);
354 /* is_done is set to negative if an error occured,
355 * and to postitive if _no_ error occured, but SMM
356 * was already notified. This avoids double notification
357 * which might lead to unexpected results...
360 module_put(calling_module
);
362 } else if (is_done
< 0) {
363 module_put(calling_module
);
364 return_VALUE(is_done
);
369 /* Can't write pstate_cnt to smi_cmd if either value is zero */
370 if ((!acpi_fadt
.smi_cmd
) || (!acpi_fadt
.pstate_cnt
)) {
371 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No SMI port or pstate_cnt\n"));
372 module_put(calling_module
);
376 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
377 "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
378 acpi_fadt
.pstate_cnt
, acpi_fadt
.smi_cmd
));
380 /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
381 * it anyway, so we need to support it... */
382 if (acpi_fadt_is_v1
) {
383 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
384 "Using v1.0 FADT reserved value for pstate_cnt\n"));
387 status
= acpi_os_write_port(acpi_fadt
.smi_cmd
,
388 (u32
) acpi_fadt
.pstate_cnt
, 8);
389 if (ACPI_FAILURE(status
)) {
390 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
391 "Failed to write pstate_cnt [0x%x] to "
392 "smi_cmd [0x%x]\n", acpi_fadt
.pstate_cnt
,
394 module_put(calling_module
);
395 return_VALUE(status
);
398 /* Success. If there's no _PPC, we need to fear nothing, so
399 * we can allow the cpufreq driver to be rmmod'ed. */
402 if (!(acpi_processor_ppc_status
& PPC_IN_USE
))
403 module_put(calling_module
);
408 EXPORT_SYMBOL(acpi_processor_notify_smm
);
410 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
411 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
413 static int acpi_processor_perf_open_fs(struct inode
*inode
, struct file
*file
);
414 static struct file_operations acpi_processor_perf_fops
= {
415 .open
= acpi_processor_perf_open_fs
,
418 .release
= single_release
,
421 static int acpi_processor_perf_seq_show(struct seq_file
*seq
, void *offset
)
423 struct acpi_processor
*pr
= (struct acpi_processor
*)seq
->private;
426 ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show");
431 if (!pr
->performance
) {
432 seq_puts(seq
, "<not supported>\n");
436 seq_printf(seq
, "state count: %d\n"
437 "active state: P%d\n",
438 pr
->performance
->state_count
, pr
->performance
->state
);
440 seq_puts(seq
, "states:\n");
441 for (i
= 0; i
< pr
->performance
->state_count
; i
++)
443 " %cP%d: %d MHz, %d mW, %d uS\n",
444 (i
== pr
->performance
->state
? '*' : ' '), i
,
445 (u32
) pr
->performance
->states
[i
].core_frequency
,
446 (u32
) pr
->performance
->states
[i
].power
,
447 (u32
) pr
->performance
->states
[i
].transition_latency
);
453 static int acpi_processor_perf_open_fs(struct inode
*inode
, struct file
*file
)
455 return single_open(file
, acpi_processor_perf_seq_show
,
460 acpi_processor_write_performance(struct file
*file
,
461 const char __user
* buffer
,
462 size_t count
, loff_t
* data
)
465 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
466 struct acpi_processor
*pr
= (struct acpi_processor
*)m
->private;
467 struct acpi_processor_performance
*perf
;
468 char state_string
[12] = { '\0' };
469 unsigned int new_state
= 0;
470 struct cpufreq_policy policy
;
472 ACPI_FUNCTION_TRACE("acpi_processor_write_performance");
474 if (!pr
|| (count
> sizeof(state_string
) - 1))
475 return_VALUE(-EINVAL
);
477 perf
= pr
->performance
;
479 return_VALUE(-EINVAL
);
481 if (copy_from_user(state_string
, buffer
, count
))
482 return_VALUE(-EFAULT
);
484 state_string
[count
] = '\0';
485 new_state
= simple_strtoul(state_string
, NULL
, 0);
487 if (new_state
>= perf
->state_count
)
488 return_VALUE(-EINVAL
);
490 cpufreq_get_policy(&policy
, pr
->id
);
493 policy
.min
= perf
->states
[new_state
].core_frequency
* 1000;
494 policy
.max
= perf
->states
[new_state
].core_frequency
* 1000;
496 result
= cpufreq_set_policy(&policy
);
498 return_VALUE(result
);
503 static void acpi_cpufreq_add_file(struct acpi_processor
*pr
)
505 struct proc_dir_entry
*entry
= NULL
;
506 struct acpi_device
*device
= NULL
;
508 ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
510 if (acpi_bus_get_device(pr
->handle
, &device
))
513 /* add file 'performance' [R/W] */
514 entry
= create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE
,
515 S_IFREG
| S_IRUGO
| S_IWUSR
,
516 acpi_device_dir(device
));
518 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
519 "Unable to create '%s' fs entry\n",
520 ACPI_PROCESSOR_FILE_PERFORMANCE
));
522 acpi_processor_perf_fops
.write
= acpi_processor_write_performance
;
523 entry
->proc_fops
= &acpi_processor_perf_fops
;
524 entry
->data
= acpi_driver_data(device
);
525 entry
->owner
= THIS_MODULE
;
530 static void acpi_cpufreq_remove_file(struct acpi_processor
*pr
)
532 struct acpi_device
*device
= NULL
;
534 ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
536 if (acpi_bus_get_device(pr
->handle
, &device
))
539 /* remove file 'performance' */
540 remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE
,
541 acpi_device_dir(device
));
547 static void acpi_cpufreq_add_file(struct acpi_processor
*pr
)
551 static void acpi_cpufreq_remove_file(struct acpi_processor
*pr
)
555 #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
557 static int acpi_processor_get_psd(struct acpi_processor
*pr
)
560 acpi_status status
= AE_OK
;
561 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
562 struct acpi_buffer format
= {sizeof("NNNNN"), "NNNNN"};
563 struct acpi_buffer state
= {0, NULL
};
564 union acpi_object
*psd
= NULL
;
565 struct acpi_psd_package
*pdomain
;
567 status
= acpi_evaluate_object(pr
->handle
, "_PSD", NULL
, &buffer
);
568 if (ACPI_FAILURE(status
)) {
572 psd
= (union acpi_object
*) buffer
.pointer
;
573 if (!psd
|| (psd
->type
!= ACPI_TYPE_PACKAGE
)) {
574 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid _PSD data\n"));
579 if (psd
->package
.count
!= 1) {
580 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid _PSD data\n"));
585 pdomain
= &(pr
->performance
->domain_info
);
587 state
.length
= sizeof(struct acpi_psd_package
);
588 state
.pointer
= pdomain
;
590 status
= acpi_extract_package(&(psd
->package
.elements
[0]),
592 if (ACPI_FAILURE(status
)) {
593 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid _PSD data\n"));
598 if (pdomain
->num_entries
!= ACPI_PSD_REV0_ENTRIES
) {
599 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Unknown _PSD:num_entries\n"));
604 if (pdomain
->revision
!= ACPI_PSD_REV0_REVISION
) {
605 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Unknown _PSD:revision\n"));
611 acpi_os_free(buffer
.pointer
);
615 int acpi_processor_preregister_performance(
616 struct acpi_processor_performance
**performance
)
618 int count
, count_target
;
621 cpumask_t covered_cpus
;
622 struct acpi_processor
*pr
;
623 struct acpi_psd_package
*pdomain
;
624 struct acpi_processor
*match_pr
;
625 struct acpi_psd_package
*match_pdomain
;
627 down(&performance_sem
);
631 /* Call _PSD for all CPUs */
632 for_each_possible_cpu(i
) {
635 /* Look only at processors in ACPI namespace */
639 if (pr
->performance
) {
644 if (!performance
|| !performance
[i
]) {
649 pr
->performance
= performance
[i
];
650 cpu_set(i
, pr
->performance
->shared_cpu_map
);
651 if (acpi_processor_get_psd(pr
)) {
660 * Now that we have _PSD data from all CPUs, lets setup P-state
663 for_each_possible_cpu(i
) {
668 /* Basic validity check for domain info */
669 pdomain
= &(pr
->performance
->domain_info
);
670 if ((pdomain
->revision
!= ACPI_PSD_REV0_REVISION
) ||
671 (pdomain
->num_entries
!= ACPI_PSD_REV0_ENTRIES
)) {
675 if (pdomain
->coord_type
!= DOMAIN_COORD_TYPE_SW_ALL
&&
676 pdomain
->coord_type
!= DOMAIN_COORD_TYPE_SW_ANY
&&
677 pdomain
->coord_type
!= DOMAIN_COORD_TYPE_HW_ALL
) {
683 cpus_clear(covered_cpus
);
684 for_each_possible_cpu(i
) {
689 if (cpu_isset(i
, covered_cpus
))
692 pdomain
= &(pr
->performance
->domain_info
);
693 cpu_set(i
, pr
->performance
->shared_cpu_map
);
694 cpu_set(i
, covered_cpus
);
695 if (pdomain
->num_processors
<= 1)
698 /* Validate the Domain info */
699 count_target
= pdomain
->num_processors
;
701 if (pdomain
->coord_type
== DOMAIN_COORD_TYPE_SW_ALL
||
702 pdomain
->coord_type
== DOMAIN_COORD_TYPE_HW_ALL
) {
703 pr
->performance
->shared_type
= CPUFREQ_SHARED_TYPE_ALL
;
704 } else if (pdomain
->coord_type
== DOMAIN_COORD_TYPE_SW_ANY
) {
705 pr
->performance
->shared_type
= CPUFREQ_SHARED_TYPE_ANY
;
708 for_each_possible_cpu(j
) {
712 match_pr
= processors
[j
];
716 match_pdomain
= &(match_pr
->performance
->domain_info
);
717 if (match_pdomain
->domain
!= pdomain
->domain
)
720 /* Here i and j are in the same domain */
722 if (match_pdomain
->num_processors
!= count_target
) {
727 if (pdomain
->coord_type
!= match_pdomain
->coord_type
) {
732 cpu_set(j
, covered_cpus
);
733 cpu_set(j
, pr
->performance
->shared_cpu_map
);
737 for_each_possible_cpu(j
) {
741 match_pr
= processors
[j
];
745 match_pdomain
= &(match_pr
->performance
->domain_info
);
746 if (match_pdomain
->domain
!= pdomain
->domain
)
749 match_pr
->performance
->shared_type
=
750 pr
->performance
->shared_type
;
751 match_pr
->performance
->shared_cpu_map
=
752 pr
->performance
->shared_cpu_map
;
758 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error while parsing _PSD domain information. Assuming no coordination\n"));
761 for_each_possible_cpu(i
) {
763 if (!pr
|| !pr
->performance
)
766 /* Assume no coordination on any error parsing domain info */
768 cpus_clear(pr
->performance
->shared_cpu_map
);
769 cpu_set(i
, pr
->performance
->shared_cpu_map
);
770 pr
->performance
->shared_type
= CPUFREQ_SHARED_TYPE_ALL
;
772 pr
->performance
= NULL
; /* Will be set for real in register */
775 up(&performance_sem
);
778 EXPORT_SYMBOL(acpi_processor_preregister_performance
);
782 acpi_processor_register_performance(struct acpi_processor_performance
783 *performance
, unsigned int cpu
)
785 struct acpi_processor
*pr
;
787 ACPI_FUNCTION_TRACE("acpi_processor_register_performance");
789 if (!(acpi_processor_ppc_status
& PPC_REGISTERED
))
790 return_VALUE(-EINVAL
);
792 mutex_lock(&performance_mutex
);
794 pr
= processors
[cpu
];
796 mutex_unlock(&performance_mutex
);
797 return_VALUE(-ENODEV
);
800 if (pr
->performance
) {
801 mutex_unlock(&performance_mutex
);
802 return_VALUE(-EBUSY
);
805 WARN_ON(!performance
);
807 pr
->performance
= performance
;
809 if (acpi_processor_get_performance_info(pr
)) {
810 pr
->performance
= NULL
;
811 mutex_unlock(&performance_mutex
);
815 acpi_cpufreq_add_file(pr
);
817 mutex_unlock(&performance_mutex
);
821 EXPORT_SYMBOL(acpi_processor_register_performance
);
824 acpi_processor_unregister_performance(struct acpi_processor_performance
825 *performance
, unsigned int cpu
)
827 struct acpi_processor
*pr
;
829 ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance");
831 mutex_lock(&performance_mutex
);
833 pr
= processors
[cpu
];
835 mutex_unlock(&performance_mutex
);
840 kfree(pr
->performance
->states
);
841 pr
->performance
= NULL
;
843 acpi_cpufreq_remove_file(pr
);
845 mutex_unlock(&performance_mutex
);
850 EXPORT_SYMBOL(acpi_processor_unregister_performance
);