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
;
87 if (ppc
>= pr
->performance
->state_count
)
90 cpufreq_verify_within_limits(policy
, 0,
91 pr
->performance
->states
[ppc
].
92 core_frequency
* 1000);
95 mutex_unlock(&performance_mutex
);
100 static struct notifier_block acpi_ppc_notifier_block
= {
101 .notifier_call
= acpi_processor_ppc_notifier
,
104 static int acpi_processor_get_platform_limit(struct acpi_processor
*pr
)
106 acpi_status status
= 0;
107 unsigned long ppc
= 0;
114 * _PPC indicates the maximum state currently supported by the platform
115 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
117 status
= acpi_evaluate_integer(pr
->handle
, "_PPC", NULL
, &ppc
);
119 if (status
!= AE_NOT_FOUND
)
120 acpi_processor_ppc_status
|= PPC_IN_USE
;
122 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
123 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PPC"));
127 pr
->performance_platform_limit
= (int)ppc
;
132 int acpi_processor_ppc_has_changed(struct acpi_processor
*pr
)
134 int ret
= acpi_processor_get_platform_limit(pr
);
138 return cpufreq_update_policy(pr
->id
);
141 void acpi_processor_ppc_init(void)
143 if (!cpufreq_register_notifier
144 (&acpi_ppc_notifier_block
, CPUFREQ_POLICY_NOTIFIER
))
145 acpi_processor_ppc_status
|= PPC_REGISTERED
;
148 "Warning: Processor Platform Limit not supported.\n");
151 void acpi_processor_ppc_exit(void)
153 if (acpi_processor_ppc_status
& PPC_REGISTERED
)
154 cpufreq_unregister_notifier(&acpi_ppc_notifier_block
,
155 CPUFREQ_POLICY_NOTIFIER
);
157 acpi_processor_ppc_status
&= ~PPC_REGISTERED
;
160 static int acpi_processor_get_performance_control(struct acpi_processor
*pr
)
163 acpi_status status
= 0;
164 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
165 union acpi_object
*pct
= NULL
;
166 union acpi_object obj
= { 0 };
169 status
= acpi_evaluate_object(pr
->handle
, "_PCT", NULL
, &buffer
);
170 if (ACPI_FAILURE(status
)) {
171 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PCT"));
175 pct
= (union acpi_object
*)buffer
.pointer
;
176 if (!pct
|| (pct
->type
!= ACPI_TYPE_PACKAGE
)
177 || (pct
->package
.count
!= 2)) {
178 printk(KERN_ERR PREFIX
"Invalid _PCT data\n");
187 obj
= pct
->package
.elements
[0];
189 if ((obj
.type
!= ACPI_TYPE_BUFFER
)
190 || (obj
.buffer
.length
< sizeof(struct acpi_pct_register
))
191 || (obj
.buffer
.pointer
== NULL
)) {
192 printk(KERN_ERR PREFIX
"Invalid _PCT data (control_register)\n");
196 memcpy(&pr
->performance
->control_register
, obj
.buffer
.pointer
,
197 sizeof(struct acpi_pct_register
));
203 obj
= pct
->package
.elements
[1];
205 if ((obj
.type
!= ACPI_TYPE_BUFFER
)
206 || (obj
.buffer
.length
< sizeof(struct acpi_pct_register
))
207 || (obj
.buffer
.pointer
== NULL
)) {
208 printk(KERN_ERR PREFIX
"Invalid _PCT data (status_register)\n");
213 memcpy(&pr
->performance
->status_register
, obj
.buffer
.pointer
,
214 sizeof(struct acpi_pct_register
));
217 kfree(buffer
.pointer
);
222 static int acpi_processor_get_performance_states(struct acpi_processor
*pr
)
225 acpi_status status
= AE_OK
;
226 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
227 struct acpi_buffer format
= { sizeof("NNNNNN"), "NNNNNN" };
228 struct acpi_buffer state
= { 0, NULL
};
229 union acpi_object
*pss
= NULL
;
233 status
= acpi_evaluate_object(pr
->handle
, "_PSS", NULL
, &buffer
);
234 if (ACPI_FAILURE(status
)) {
235 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PSS"));
239 pss
= (union acpi_object
*)buffer
.pointer
;
240 if (!pss
|| (pss
->type
!= ACPI_TYPE_PACKAGE
)) {
241 printk(KERN_ERR PREFIX
"Invalid _PSS data\n");
246 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d performance states\n",
247 pss
->package
.count
));
249 pr
->performance
->state_count
= pss
->package
.count
;
250 pr
->performance
->states
=
251 kmalloc(sizeof(struct acpi_processor_px
) * pss
->package
.count
,
253 if (!pr
->performance
->states
) {
258 for (i
= 0; i
< pr
->performance
->state_count
; i
++) {
260 struct acpi_processor_px
*px
= &(pr
->performance
->states
[i
]);
262 state
.length
= sizeof(struct acpi_processor_px
);
265 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Extracting state %d\n", i
));
267 status
= acpi_extract_package(&(pss
->package
.elements
[i
]),
269 if (ACPI_FAILURE(status
)) {
270 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _PSS data"));
272 kfree(pr
->performance
->states
);
276 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
277 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
279 (u32
) px
->core_frequency
,
281 (u32
) px
->transition_latency
,
282 (u32
) px
->bus_master_latency
,
283 (u32
) px
->control
, (u32
) px
->status
));
285 if (!px
->core_frequency
) {
286 printk(KERN_ERR PREFIX
287 "Invalid _PSS data: freq is zero\n");
289 kfree(pr
->performance
->states
);
295 kfree(buffer
.pointer
);
300 static int acpi_processor_get_performance_info(struct acpi_processor
*pr
)
303 acpi_status status
= AE_OK
;
304 acpi_handle handle
= NULL
;
307 if (!pr
|| !pr
->performance
|| !pr
->handle
)
310 status
= acpi_get_handle(pr
->handle
, "_PCT", &handle
);
311 if (ACPI_FAILURE(status
)) {
312 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
313 "ACPI-based processor performance control unavailable\n"));
317 result
= acpi_processor_get_performance_control(pr
);
321 result
= acpi_processor_get_performance_states(pr
);
325 result
= acpi_processor_get_platform_limit(pr
);
332 int acpi_processor_notify_smm(struct module
*calling_module
)
335 static int is_done
= 0;
338 if (!(acpi_processor_ppc_status
& PPC_REGISTERED
))
341 if (!try_module_get(calling_module
))
344 /* is_done is set to negative if an error occured,
345 * and to postitive if _no_ error occured, but SMM
346 * was already notified. This avoids double notification
347 * which might lead to unexpected results...
350 module_put(calling_module
);
352 } else if (is_done
< 0) {
353 module_put(calling_module
);
359 /* Can't write pstate_cnt to smi_cmd if either value is zero */
360 if ((!acpi_fadt
.smi_cmd
) || (!acpi_fadt
.pstate_cnt
)) {
361 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No SMI port or pstate_cnt\n"));
362 module_put(calling_module
);
366 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
367 "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
368 acpi_fadt
.pstate_cnt
, acpi_fadt
.smi_cmd
));
370 /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
371 * it anyway, so we need to support it... */
372 if (acpi_fadt_is_v1
) {
373 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
374 "Using v1.0 FADT reserved value for pstate_cnt\n"));
377 status
= acpi_os_write_port(acpi_fadt
.smi_cmd
,
378 (u32
) acpi_fadt
.pstate_cnt
, 8);
379 if (ACPI_FAILURE(status
)) {
380 ACPI_EXCEPTION((AE_INFO
, status
,
381 "Failed to write pstate_cnt [0x%x] to "
382 "smi_cmd [0x%x]", acpi_fadt
.pstate_cnt
,
384 module_put(calling_module
);
388 /* Success. If there's no _PPC, we need to fear nothing, so
389 * we can allow the cpufreq driver to be rmmod'ed. */
392 if (!(acpi_processor_ppc_status
& PPC_IN_USE
))
393 module_put(calling_module
);
398 EXPORT_SYMBOL(acpi_processor_notify_smm
);
400 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
401 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
403 static int acpi_processor_perf_open_fs(struct inode
*inode
, struct file
*file
);
404 static struct file_operations acpi_processor_perf_fops
= {
405 .open
= acpi_processor_perf_open_fs
,
408 .release
= single_release
,
411 static int acpi_processor_perf_seq_show(struct seq_file
*seq
, void *offset
)
413 struct acpi_processor
*pr
= (struct acpi_processor
*)seq
->private;
420 if (!pr
->performance
) {
421 seq_puts(seq
, "<not supported>\n");
425 seq_printf(seq
, "state count: %d\n"
426 "active state: P%d\n",
427 pr
->performance
->state_count
, pr
->performance
->state
);
429 seq_puts(seq
, "states:\n");
430 for (i
= 0; i
< pr
->performance
->state_count
; i
++)
432 " %cP%d: %d MHz, %d mW, %d uS\n",
433 (i
== pr
->performance
->state
? '*' : ' '), i
,
434 (u32
) pr
->performance
->states
[i
].core_frequency
,
435 (u32
) pr
->performance
->states
[i
].power
,
436 (u32
) pr
->performance
->states
[i
].transition_latency
);
442 static int acpi_processor_perf_open_fs(struct inode
*inode
, struct file
*file
)
444 return single_open(file
, acpi_processor_perf_seq_show
,
449 acpi_processor_write_performance(struct file
*file
,
450 const char __user
* buffer
,
451 size_t count
, loff_t
* data
)
454 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
455 struct acpi_processor
*pr
= (struct acpi_processor
*)m
->private;
456 struct acpi_processor_performance
*perf
;
457 char state_string
[12] = { '\0' };
458 unsigned int new_state
= 0;
459 struct cpufreq_policy policy
;
462 if (!pr
|| (count
> sizeof(state_string
) - 1))
465 perf
= pr
->performance
;
469 if (copy_from_user(state_string
, buffer
, count
))
472 state_string
[count
] = '\0';
473 new_state
= simple_strtoul(state_string
, NULL
, 0);
475 if (new_state
>= perf
->state_count
)
478 cpufreq_get_policy(&policy
, pr
->id
);
481 policy
.min
= perf
->states
[new_state
].core_frequency
* 1000;
482 policy
.max
= perf
->states
[new_state
].core_frequency
* 1000;
484 result
= cpufreq_set_policy(&policy
);
491 static void acpi_cpufreq_add_file(struct acpi_processor
*pr
)
493 struct proc_dir_entry
*entry
= NULL
;
494 struct acpi_device
*device
= NULL
;
497 if (acpi_bus_get_device(pr
->handle
, &device
))
500 /* add file 'performance' [R/W] */
501 entry
= create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE
,
502 S_IFREG
| S_IRUGO
| S_IWUSR
,
503 acpi_device_dir(device
));
505 acpi_processor_perf_fops
.write
= acpi_processor_write_performance
;
506 entry
->proc_fops
= &acpi_processor_perf_fops
;
507 entry
->data
= acpi_driver_data(device
);
508 entry
->owner
= THIS_MODULE
;
513 static void acpi_cpufreq_remove_file(struct acpi_processor
*pr
)
515 struct acpi_device
*device
= NULL
;
518 if (acpi_bus_get_device(pr
->handle
, &device
))
521 /* remove file 'performance' */
522 remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE
,
523 acpi_device_dir(device
));
529 static void acpi_cpufreq_add_file(struct acpi_processor
*pr
)
533 static void acpi_cpufreq_remove_file(struct acpi_processor
*pr
)
537 #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
539 static int acpi_processor_get_psd(struct acpi_processor
*pr
)
542 acpi_status status
= AE_OK
;
543 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
544 struct acpi_buffer format
= {sizeof("NNNNN"), "NNNNN"};
545 struct acpi_buffer state
= {0, NULL
};
546 union acpi_object
*psd
= NULL
;
547 struct acpi_psd_package
*pdomain
;
549 status
= acpi_evaluate_object(pr
->handle
, "_PSD", NULL
, &buffer
);
550 if (ACPI_FAILURE(status
)) {
554 psd
= (union acpi_object
*) buffer
.pointer
;
555 if (!psd
|| (psd
->type
!= ACPI_TYPE_PACKAGE
)) {
556 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid _PSD data\n"));
561 if (psd
->package
.count
!= 1) {
562 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid _PSD data\n"));
567 pdomain
= &(pr
->performance
->domain_info
);
569 state
.length
= sizeof(struct acpi_psd_package
);
570 state
.pointer
= pdomain
;
572 status
= acpi_extract_package(&(psd
->package
.elements
[0]),
574 if (ACPI_FAILURE(status
)) {
575 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid _PSD data\n"));
580 if (pdomain
->num_entries
!= ACPI_PSD_REV0_ENTRIES
) {
581 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Unknown _PSD:num_entries\n"));
586 if (pdomain
->revision
!= ACPI_PSD_REV0_REVISION
) {
587 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Unknown _PSD:revision\n"));
593 kfree(buffer
.pointer
);
597 int acpi_processor_preregister_performance(
598 struct acpi_processor_performance
**performance
)
600 int count
, count_target
;
603 cpumask_t covered_cpus
;
604 struct acpi_processor
*pr
;
605 struct acpi_psd_package
*pdomain
;
606 struct acpi_processor
*match_pr
;
607 struct acpi_psd_package
*match_pdomain
;
609 mutex_lock(&performance_mutex
);
613 /* Call _PSD for all CPUs */
614 for_each_possible_cpu(i
) {
617 /* Look only at processors in ACPI namespace */
621 if (pr
->performance
) {
626 if (!performance
|| !performance
[i
]) {
631 pr
->performance
= performance
[i
];
632 cpu_set(i
, pr
->performance
->shared_cpu_map
);
633 if (acpi_processor_get_psd(pr
)) {
642 * Now that we have _PSD data from all CPUs, lets setup P-state
645 for_each_possible_cpu(i
) {
650 /* Basic validity check for domain info */
651 pdomain
= &(pr
->performance
->domain_info
);
652 if ((pdomain
->revision
!= ACPI_PSD_REV0_REVISION
) ||
653 (pdomain
->num_entries
!= ACPI_PSD_REV0_ENTRIES
)) {
657 if (pdomain
->coord_type
!= DOMAIN_COORD_TYPE_SW_ALL
&&
658 pdomain
->coord_type
!= DOMAIN_COORD_TYPE_SW_ANY
&&
659 pdomain
->coord_type
!= DOMAIN_COORD_TYPE_HW_ALL
) {
665 cpus_clear(covered_cpus
);
666 for_each_possible_cpu(i
) {
671 if (cpu_isset(i
, covered_cpus
))
674 pdomain
= &(pr
->performance
->domain_info
);
675 cpu_set(i
, pr
->performance
->shared_cpu_map
);
676 cpu_set(i
, covered_cpus
);
677 if (pdomain
->num_processors
<= 1)
680 /* Validate the Domain info */
681 count_target
= pdomain
->num_processors
;
683 if (pdomain
->coord_type
== DOMAIN_COORD_TYPE_SW_ALL
)
684 pr
->performance
->shared_type
= CPUFREQ_SHARED_TYPE_ALL
;
685 else if (pdomain
->coord_type
== DOMAIN_COORD_TYPE_HW_ALL
)
686 pr
->performance
->shared_type
= CPUFREQ_SHARED_TYPE_HW
;
687 else if (pdomain
->coord_type
== DOMAIN_COORD_TYPE_SW_ANY
)
688 pr
->performance
->shared_type
= CPUFREQ_SHARED_TYPE_ANY
;
690 for_each_possible_cpu(j
) {
694 match_pr
= processors
[j
];
698 match_pdomain
= &(match_pr
->performance
->domain_info
);
699 if (match_pdomain
->domain
!= pdomain
->domain
)
702 /* Here i and j are in the same domain */
704 if (match_pdomain
->num_processors
!= count_target
) {
709 if (pdomain
->coord_type
!= match_pdomain
->coord_type
) {
714 cpu_set(j
, covered_cpus
);
715 cpu_set(j
, pr
->performance
->shared_cpu_map
);
719 for_each_possible_cpu(j
) {
723 match_pr
= processors
[j
];
727 match_pdomain
= &(match_pr
->performance
->domain_info
);
728 if (match_pdomain
->domain
!= pdomain
->domain
)
731 match_pr
->performance
->shared_type
=
732 pr
->performance
->shared_type
;
733 match_pr
->performance
->shared_cpu_map
=
734 pr
->performance
->shared_cpu_map
;
740 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error while parsing _PSD domain information. Assuming no coordination\n"));
743 for_each_possible_cpu(i
) {
745 if (!pr
|| !pr
->performance
)
748 /* Assume no coordination on any error parsing domain info */
750 cpus_clear(pr
->performance
->shared_cpu_map
);
751 cpu_set(i
, pr
->performance
->shared_cpu_map
);
752 pr
->performance
->shared_type
= CPUFREQ_SHARED_TYPE_ALL
;
754 pr
->performance
= NULL
; /* Will be set for real in register */
757 mutex_unlock(&performance_mutex
);
760 EXPORT_SYMBOL(acpi_processor_preregister_performance
);
764 acpi_processor_register_performance(struct acpi_processor_performance
765 *performance
, unsigned int cpu
)
767 struct acpi_processor
*pr
;
770 if (!(acpi_processor_ppc_status
& PPC_REGISTERED
))
773 mutex_lock(&performance_mutex
);
775 pr
= processors
[cpu
];
777 mutex_unlock(&performance_mutex
);
781 if (pr
->performance
) {
782 mutex_unlock(&performance_mutex
);
786 WARN_ON(!performance
);
788 pr
->performance
= performance
;
790 if (acpi_processor_get_performance_info(pr
)) {
791 pr
->performance
= NULL
;
792 mutex_unlock(&performance_mutex
);
796 acpi_cpufreq_add_file(pr
);
798 mutex_unlock(&performance_mutex
);
802 EXPORT_SYMBOL(acpi_processor_register_performance
);
805 acpi_processor_unregister_performance(struct acpi_processor_performance
806 *performance
, unsigned int cpu
)
808 struct acpi_processor
*pr
;
811 mutex_lock(&performance_mutex
);
813 pr
= processors
[cpu
];
815 mutex_unlock(&performance_mutex
);
820 kfree(pr
->performance
->states
);
821 pr
->performance
= NULL
;
823 acpi_cpufreq_remove_file(pr
);
825 mutex_unlock(&performance_mutex
);
830 EXPORT_SYMBOL(acpi_processor_unregister_performance
);