2 * acpi_processor.c - ACPI Processor Driver ($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
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28 * 1. Make # power states dynamic.
29 * 2. Support duty_cycle values that span bit 4.
30 * 3. Optimize by having scheduler determine business instead of
31 * having us try to calculate it here.
32 * 4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/types.h>
39 #include <linux/pci.h>
41 #include <linux/cpufreq.h>
42 #include <linux/cpu.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/dmi.h>
46 #include <linux/moduleparam.h>
49 #include <asm/system.h>
51 #include <asm/delay.h>
52 #include <asm/uaccess.h>
53 #include <asm/processor.h>
57 #include <acpi/acpi_bus.h>
58 #include <acpi/acpi_drivers.h>
59 #include <acpi/processor.h>
61 #define ACPI_PROCESSOR_COMPONENT 0x01000000
62 #define ACPI_PROCESSOR_CLASS "processor"
63 #define ACPI_PROCESSOR_DEVICE_NAME "Processor"
64 #define ACPI_PROCESSOR_FILE_INFO "info"
65 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
66 #define ACPI_PROCESSOR_FILE_LIMIT "limit"
67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
68 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81
69 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
71 #define ACPI_PROCESSOR_LIMIT_USER 0
72 #define ACPI_PROCESSOR_LIMIT_THERMAL 1
74 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
75 ACPI_MODULE_NAME("processor_core");
77 MODULE_AUTHOR("Paul Diefenbaugh");
78 MODULE_DESCRIPTION("ACPI Processor Driver");
79 MODULE_LICENSE("GPL");
81 static int acpi_processor_add(struct acpi_device
*device
);
82 static int acpi_processor_start(struct acpi_device
*device
);
83 static int acpi_processor_remove(struct acpi_device
*device
, int type
);
84 static int acpi_processor_info_open_fs(struct inode
*inode
, struct file
*file
);
85 static void acpi_processor_notify(acpi_handle handle
, u32 event
, void *data
);
86 static acpi_status
acpi_processor_hotadd_init(acpi_handle handle
, int *p_cpu
);
87 static int acpi_processor_handle_eject(struct acpi_processor
*pr
);
88 extern int acpi_processor_tstate_has_changed(struct acpi_processor
*pr
);
91 static const struct acpi_device_id processor_device_ids
[] = {
92 {ACPI_PROCESSOR_HID
, 0},
95 MODULE_DEVICE_TABLE(acpi
, processor_device_ids
);
97 static struct acpi_driver acpi_processor_driver
= {
99 .class = ACPI_PROCESSOR_CLASS
,
100 .ids
= processor_device_ids
,
102 .add
= acpi_processor_add
,
103 .remove
= acpi_processor_remove
,
104 .start
= acpi_processor_start
,
108 #define INSTALL_NOTIFY_HANDLER 1
109 #define UNINSTALL_NOTIFY_HANDLER 2
111 static const struct file_operations acpi_processor_info_fops
= {
112 .open
= acpi_processor_info_open_fs
,
115 .release
= single_release
,
118 struct acpi_processor
*processors
[NR_CPUS
];
119 struct acpi_processor_errata errata __read_mostly
;
121 /* --------------------------------------------------------------------------
123 -------------------------------------------------------------------------- */
125 static int acpi_processor_errata_piix4(struct pci_dev
*dev
)
135 * Note that 'dev' references the PIIX4 ACPI Controller.
138 switch (dev
->revision
) {
140 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4 A-step\n"));
143 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4 B-step\n"));
146 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4E\n"));
149 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4M\n"));
152 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found unknown PIIX4\n"));
156 switch (dev
->revision
) {
158 case 0: /* PIIX4 A-step */
159 case 1: /* PIIX4 B-step */
161 * See specification changes #13 ("Manual Throttle Duty Cycle")
162 * and #14 ("Enabling and Disabling Manual Throttle"), plus
163 * erratum #5 ("STPCLK# Deassertion Time") from the January
164 * 2002 PIIX4 specification update. Applies to only older
167 errata
.piix4
.throttle
= 1;
172 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
173 * Livelock") from the January 2002 PIIX4 specification update.
174 * Applies to all PIIX4 models.
180 * Find the PIIX4 IDE Controller and get the Bus Master IDE
181 * Status register address. We'll use this later to read
182 * each IDE controller's DMA status to make sure we catch all
185 dev
= pci_get_subsys(PCI_VENDOR_ID_INTEL
,
186 PCI_DEVICE_ID_INTEL_82371AB
,
187 PCI_ANY_ID
, PCI_ANY_ID
, NULL
);
189 errata
.piix4
.bmisx
= pci_resource_start(dev
, 4);
196 * Find the PIIX4 ISA Controller and read the Motherboard
197 * DMA controller's status to see if Type-F (Fast) DMA mode
198 * is enabled (bit 7) on either channel. Note that we'll
199 * disable C3 support if this is enabled, as some legacy
200 * devices won't operate well if fast DMA is disabled.
202 dev
= pci_get_subsys(PCI_VENDOR_ID_INTEL
,
203 PCI_DEVICE_ID_INTEL_82371AB_0
,
204 PCI_ANY_ID
, PCI_ANY_ID
, NULL
);
206 pci_read_config_byte(dev
, 0x76, &value1
);
207 pci_read_config_byte(dev
, 0x77, &value2
);
208 if ((value1
& 0x80) || (value2
& 0x80))
209 errata
.piix4
.fdma
= 1;
216 if (errata
.piix4
.bmisx
)
217 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
218 "Bus master activity detection (BM-IDE) erratum enabled\n"));
219 if (errata
.piix4
.fdma
)
220 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
221 "Type-F DMA livelock erratum (C3 disabled)\n"));
226 static int acpi_processor_errata(struct acpi_processor
*pr
)
229 struct pci_dev
*dev
= NULL
;
238 dev
= pci_get_subsys(PCI_VENDOR_ID_INTEL
,
239 PCI_DEVICE_ID_INTEL_82371AB_3
, PCI_ANY_ID
,
242 result
= acpi_processor_errata_piix4(dev
);
249 /* --------------------------------------------------------------------------
250 Common ACPI processor functions
251 -------------------------------------------------------------------------- */
254 * _PDC is required for a BIOS-OS handshake for most of the newer
255 * ACPI processor features.
257 static int acpi_processor_set_pdc(struct acpi_processor
*pr
)
259 struct acpi_object_list
*pdc_in
= pr
->pdc
;
260 acpi_status status
= AE_OK
;
266 status
= acpi_evaluate_object(pr
->handle
, "_PDC", pdc_in
, NULL
);
268 if (ACPI_FAILURE(status
))
269 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
270 "Could not evaluate _PDC, using legacy perf. control...\n"));
275 /* --------------------------------------------------------------------------
277 -------------------------------------------------------------------------- */
279 static struct proc_dir_entry
*acpi_processor_dir
= NULL
;
281 static int acpi_processor_info_seq_show(struct seq_file
*seq
, void *offset
)
283 struct acpi_processor
*pr
= seq
->private;
289 seq_printf(seq
, "processor id: %d\n"
291 "bus mastering control: %s\n"
292 "power management: %s\n"
293 "throttling control: %s\n"
294 "limit interface: %s\n",
297 pr
->flags
.bm_control
? "yes" : "no",
298 pr
->flags
.power
? "yes" : "no",
299 pr
->flags
.throttling
? "yes" : "no",
300 pr
->flags
.limit
? "yes" : "no");
306 static int acpi_processor_info_open_fs(struct inode
*inode
, struct file
*file
)
308 return single_open(file
, acpi_processor_info_seq_show
,
312 static int acpi_processor_add_fs(struct acpi_device
*device
)
314 struct proc_dir_entry
*entry
= NULL
;
317 if (!acpi_device_dir(device
)) {
318 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
320 if (!acpi_device_dir(device
))
323 acpi_device_dir(device
)->owner
= THIS_MODULE
;
326 entry
= create_proc_entry(ACPI_PROCESSOR_FILE_INFO
,
327 S_IRUGO
, acpi_device_dir(device
));
331 entry
->proc_fops
= &acpi_processor_info_fops
;
332 entry
->data
= acpi_driver_data(device
);
333 entry
->owner
= THIS_MODULE
;
336 /* 'throttling' [R/W] */
337 entry
= create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING
,
338 S_IFREG
| S_IRUGO
| S_IWUSR
,
339 acpi_device_dir(device
));
343 entry
->proc_fops
= &acpi_processor_throttling_fops
;
344 entry
->data
= acpi_driver_data(device
);
345 entry
->owner
= THIS_MODULE
;
349 entry
= create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT
,
350 S_IFREG
| S_IRUGO
| S_IWUSR
,
351 acpi_device_dir(device
));
355 entry
->proc_fops
= &acpi_processor_limit_fops
;
356 entry
->data
= acpi_driver_data(device
);
357 entry
->owner
= THIS_MODULE
;
363 static int acpi_processor_remove_fs(struct acpi_device
*device
)
366 if (acpi_device_dir(device
)) {
367 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO
,
368 acpi_device_dir(device
));
369 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING
,
370 acpi_device_dir(device
));
371 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT
,
372 acpi_device_dir(device
));
373 remove_proc_entry(acpi_device_bid(device
), acpi_processor_dir
);
374 acpi_device_dir(device
) = NULL
;
380 /* Use the acpiid in MADT to map cpus in case of SMP */
383 static int get_cpu_id(acpi_handle handle
, u32 acpi_id
) {return -1;}
386 static struct acpi_table_madt
*madt
;
388 static int map_lapic_id(struct acpi_subtable_header
*entry
,
389 u32 acpi_id
, int *apic_id
)
391 struct acpi_madt_local_apic
*lapic
=
392 (struct acpi_madt_local_apic
*)entry
;
393 if ((lapic
->lapic_flags
& ACPI_MADT_ENABLED
) &&
394 lapic
->processor_id
== acpi_id
) {
395 *apic_id
= lapic
->id
;
401 static int map_lsapic_id(struct acpi_subtable_header
*entry
,
402 u32 acpi_id
, int *apic_id
)
404 struct acpi_madt_local_sapic
*lsapic
=
405 (struct acpi_madt_local_sapic
*)entry
;
406 /* Only check enabled APICs*/
407 if (lsapic
->lapic_flags
& ACPI_MADT_ENABLED
) {
408 /* First check against id */
409 if (lsapic
->processor_id
== acpi_id
) {
410 *apic_id
= (lsapic
->id
<< 8) | lsapic
->eid
;
412 /* Check against optional uid */
413 } else if (entry
->length
>= 16 &&
414 lsapic
->uid
== acpi_id
) {
415 *apic_id
= lsapic
->uid
;
423 #define arch_cpu_to_apicid ia64_cpu_to_sapicid
425 #define arch_cpu_to_apicid x86_cpu_to_apicid
428 static int map_madt_entry(u32 acpi_id
)
430 unsigned long madt_end
, entry
;
436 entry
= (unsigned long)madt
;
437 madt_end
= entry
+ madt
->header
.length
;
439 /* Parse all entries looking for a match. */
441 entry
+= sizeof(struct acpi_table_madt
);
442 while (entry
+ sizeof(struct acpi_subtable_header
) < madt_end
) {
443 struct acpi_subtable_header
*header
=
444 (struct acpi_subtable_header
*)entry
;
445 if (header
->type
== ACPI_MADT_TYPE_LOCAL_APIC
) {
446 if (map_lapic_id(header
, acpi_id
, &apic_id
))
448 } else if (header
->type
== ACPI_MADT_TYPE_LOCAL_SAPIC
) {
449 if (map_lsapic_id(header
, acpi_id
, &apic_id
))
452 entry
+= header
->length
;
457 static int map_mat_entry(acpi_handle handle
, u32 acpi_id
)
459 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
460 union acpi_object
*obj
;
461 struct acpi_subtable_header
*header
;
464 if (ACPI_FAILURE(acpi_evaluate_object(handle
, "_MAT", NULL
, &buffer
)))
467 if (!buffer
.length
|| !buffer
.pointer
)
470 obj
= buffer
.pointer
;
471 if (obj
->type
!= ACPI_TYPE_BUFFER
||
472 obj
->buffer
.length
< sizeof(struct acpi_subtable_header
)) {
476 header
= (struct acpi_subtable_header
*)obj
->buffer
.pointer
;
477 if (header
->type
== ACPI_MADT_TYPE_LOCAL_APIC
) {
478 map_lapic_id(header
, acpi_id
, &apic_id
);
479 } else if (header
->type
== ACPI_MADT_TYPE_LOCAL_SAPIC
) {
480 map_lsapic_id(header
, acpi_id
, &apic_id
);
485 kfree(buffer
.pointer
);
489 static int get_cpu_id(acpi_handle handle
, u32 acpi_id
)
494 apic_id
= map_mat_entry(handle
, acpi_id
);
496 apic_id
= map_madt_entry(acpi_id
);
500 for (i
= 0; i
< NR_CPUS
; ++i
) {
501 if (arch_cpu_to_apicid
[i
] == apic_id
)
508 /* --------------------------------------------------------------------------
510 -------------------------------------------------------------------------- */
512 static int acpi_processor_get_info(struct acpi_processor
*pr
, unsigned has_uid
)
514 acpi_status status
= 0;
515 union acpi_object object
= { 0 };
516 struct acpi_buffer buffer
= { sizeof(union acpi_object
), &object
};
518 static int cpu0_initialized
;
524 if (num_online_cpus() > 1)
527 acpi_processor_errata(pr
);
530 * Check to see if we have bus mastering arbitration control. This
531 * is required for proper C3 usage (to maintain cache coherency).
533 if (acpi_gbl_FADT
.pm2_control_block
&& acpi_gbl_FADT
.pm2_control_length
) {
534 pr
->flags
.bm_control
= 1;
535 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
536 "Bus mastering arbitration control present\n"));
538 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
539 "No bus mastering arbitration control\n"));
541 /* Check if it is a Device with HID and UID */
544 status
= acpi_evaluate_integer(pr
->handle
, METHOD_NAME__UID
,
546 if (ACPI_FAILURE(status
)) {
547 printk(KERN_ERR PREFIX
"Evaluating processor _UID\n");
553 * Evalute the processor object. Note that it is common on SMP to
554 * have the first (boot) processor with a valid PBLK address while
555 * all others have a NULL address.
557 status
= acpi_evaluate_object(pr
->handle
, NULL
, NULL
, &buffer
);
558 if (ACPI_FAILURE(status
)) {
559 printk(KERN_ERR PREFIX
"Evaluating processor object\n");
564 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
565 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
567 pr
->acpi_id
= object
.processor
.proc_id
;
569 cpu_index
= get_cpu_id(pr
->handle
, pr
->acpi_id
);
571 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
572 if (!cpu0_initialized
&& (cpu_index
== -1) &&
573 (num_online_cpus() == 1)) {
577 cpu0_initialized
= 1;
582 * Extra Processor objects may be enumerated on MP systems with
583 * less than the max # of CPUs. They should be ignored _iff
584 * they are physically not present.
588 (acpi_processor_hotadd_init(pr
->handle
, &pr
->id
))) {
593 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Processor [%d:%d]\n", pr
->id
,
596 if (!object
.processor
.pblk_address
)
597 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No PBLK (NULL address)\n"));
598 else if (object
.processor
.pblk_length
!= 6)
599 printk(KERN_ERR PREFIX
"Invalid PBLK length [%d]\n",
600 object
.processor
.pblk_length
);
602 pr
->throttling
.address
= object
.processor
.pblk_address
;
603 pr
->throttling
.duty_offset
= acpi_gbl_FADT
.duty_offset
;
604 pr
->throttling
.duty_width
= acpi_gbl_FADT
.duty_width
;
606 pr
->pblk
= object
.processor
.pblk_address
;
609 * We don't care about error returns - we just try to mark
610 * these reserved so that nobody else is confused into thinking
611 * that this region might be unused..
613 * (In particular, allocating the IO range for Cardbus)
615 request_region(pr
->throttling
.address
, 6, "ACPI CPU throttle");
618 #ifdef CONFIG_CPU_FREQ
619 acpi_processor_ppc_has_changed(pr
);
621 acpi_processor_get_throttling_info(pr
);
622 acpi_processor_get_limit_info(pr
);
627 static void *processor_device_array
[NR_CPUS
];
629 static int __cpuinit
acpi_processor_start(struct acpi_device
*device
)
632 acpi_status status
= AE_OK
;
633 struct acpi_processor
*pr
;
636 pr
= acpi_driver_data(device
);
638 result
= acpi_processor_get_info(pr
, device
->flags
.unique_id
);
640 /* Processor is physically not present */
644 BUG_ON((pr
->id
>= NR_CPUS
) || (pr
->id
< 0));
648 * ACPI id of processors can be reported wrongly by the BIOS.
649 * Don't trust it blindly
651 if (processor_device_array
[pr
->id
] != NULL
&&
652 processor_device_array
[pr
->id
] != device
) {
653 printk(KERN_WARNING
"BIOS reported wrong ACPI id"
654 "for the processor\n");
657 processor_device_array
[pr
->id
] = device
;
659 processors
[pr
->id
] = pr
;
661 result
= acpi_processor_add_fs(device
);
665 status
= acpi_install_notify_handler(pr
->handle
, ACPI_DEVICE_NOTIFY
,
666 acpi_processor_notify
, pr
);
668 /* _PDC call should be done before doing anything else (if reqd.). */
669 arch_acpi_processor_init_pdc(pr
);
670 acpi_processor_set_pdc(pr
);
672 acpi_processor_power_init(pr
, device
);
674 if (pr
->flags
.throttling
) {
675 printk(KERN_INFO PREFIX
"%s [%s] (supports",
676 acpi_device_name(device
), acpi_device_bid(device
));
677 printk(" %d throttling states", pr
->throttling
.state_count
);
686 static void acpi_processor_notify(acpi_handle handle
, u32 event
, void *data
)
688 struct acpi_processor
*pr
= data
;
689 struct acpi_device
*device
= NULL
;
695 if (acpi_bus_get_device(pr
->handle
, &device
))
699 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE
:
700 acpi_processor_ppc_has_changed(pr
);
701 acpi_bus_generate_proc_event(device
, event
,
702 pr
->performance_platform_limit
);
703 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
704 device
->dev
.bus_id
, event
,
705 pr
->performance_platform_limit
);
707 case ACPI_PROCESSOR_NOTIFY_POWER
:
708 acpi_processor_cst_has_changed(pr
);
709 acpi_bus_generate_proc_event(device
, event
, 0);
710 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
711 device
->dev
.bus_id
, event
, 0);
713 case ACPI_PROCESSOR_NOTIFY_THROTTLING
:
714 acpi_processor_tstate_has_changed(pr
);
715 acpi_bus_generate_proc_event(device
, event
, 0);
716 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
717 device
->dev
.bus_id
, event
, 0);
719 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
720 "Unsupported event [0x%x]\n", event
));
727 static int acpi_cpu_soft_notify(struct notifier_block
*nfb
,
728 unsigned long action
, void *hcpu
)
730 unsigned int cpu
= (unsigned long)hcpu
;
731 struct acpi_processor
*pr
= processors
[cpu
];
733 if (action
== CPU_ONLINE
&& pr
) {
734 acpi_processor_ppc_has_changed(pr
);
735 acpi_processor_cst_has_changed(pr
);
736 acpi_processor_tstate_has_changed(pr
);
741 static struct notifier_block acpi_cpu_notifier
=
743 .notifier_call
= acpi_cpu_soft_notify
,
746 static int acpi_processor_add(struct acpi_device
*device
)
748 struct acpi_processor
*pr
= NULL
;
754 pr
= kzalloc(sizeof(struct acpi_processor
), GFP_KERNEL
);
758 pr
->handle
= device
->handle
;
759 strcpy(acpi_device_name(device
), ACPI_PROCESSOR_DEVICE_NAME
);
760 strcpy(acpi_device_class(device
), ACPI_PROCESSOR_CLASS
);
761 acpi_driver_data(device
) = pr
;
766 static int acpi_processor_remove(struct acpi_device
*device
, int type
)
768 acpi_status status
= AE_OK
;
769 struct acpi_processor
*pr
= NULL
;
772 if (!device
|| !acpi_driver_data(device
))
775 pr
= acpi_driver_data(device
);
777 if (pr
->id
>= NR_CPUS
) {
782 if (type
== ACPI_BUS_REMOVAL_EJECT
) {
783 if (acpi_processor_handle_eject(pr
))
787 acpi_processor_power_exit(pr
, device
);
789 status
= acpi_remove_notify_handler(pr
->handle
, ACPI_DEVICE_NOTIFY
,
790 acpi_processor_notify
);
792 acpi_processor_remove_fs(device
);
794 processors
[pr
->id
] = NULL
;
801 #ifdef CONFIG_ACPI_HOTPLUG_CPU
802 /****************************************************************************
803 * Acpi processor hotplug support *
804 ****************************************************************************/
806 static int is_processor_present(acpi_handle handle
);
808 static int is_processor_present(acpi_handle handle
)
811 unsigned long sta
= 0;
814 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
815 if (ACPI_FAILURE(status
) || !(sta
& ACPI_STA_DEVICE_PRESENT
)) {
816 ACPI_EXCEPTION((AE_INFO
, status
, "Processor Device is not present"));
823 int acpi_processor_device_add(acpi_handle handle
, struct acpi_device
**device
)
826 struct acpi_device
*pdev
;
827 struct acpi_processor
*pr
;
830 if (acpi_get_parent(handle
, &phandle
)) {
834 if (acpi_bus_get_device(phandle
, &pdev
)) {
838 if (acpi_bus_add(device
, pdev
, handle
, ACPI_BUS_TYPE_PROCESSOR
)) {
842 acpi_bus_start(*device
);
844 pr
= acpi_driver_data(*device
);
848 if ((pr
->id
>= 0) && (pr
->id
< NR_CPUS
)) {
849 kobject_uevent(&(*device
)->dev
.kobj
, KOBJ_ONLINE
);
855 acpi_processor_hotplug_notify(acpi_handle handle
, u32 event
, void *data
)
857 struct acpi_processor
*pr
;
858 struct acpi_device
*device
= NULL
;
863 case ACPI_NOTIFY_BUS_CHECK
:
864 case ACPI_NOTIFY_DEVICE_CHECK
:
865 printk("Processor driver received %s event\n",
866 (event
== ACPI_NOTIFY_BUS_CHECK
) ?
867 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
869 if (!is_processor_present(handle
))
872 if (acpi_bus_get_device(handle
, &device
)) {
873 result
= acpi_processor_device_add(handle
, &device
);
875 printk(KERN_ERR PREFIX
876 "Unable to add the device\n");
880 pr
= acpi_driver_data(device
);
882 printk(KERN_ERR PREFIX
"Driver data is NULL\n");
886 if (pr
->id
>= 0 && (pr
->id
< NR_CPUS
)) {
887 kobject_uevent(&device
->dev
.kobj
, KOBJ_OFFLINE
);
891 result
= acpi_processor_start(device
);
892 if ((!result
) && ((pr
->id
>= 0) && (pr
->id
< NR_CPUS
))) {
893 kobject_uevent(&device
->dev
.kobj
, KOBJ_ONLINE
);
895 printk(KERN_ERR PREFIX
"Device [%s] failed to start\n",
896 acpi_device_bid(device
));
899 case ACPI_NOTIFY_EJECT_REQUEST
:
900 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
901 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
903 if (acpi_bus_get_device(handle
, &device
)) {
904 printk(KERN_ERR PREFIX
905 "Device don't exist, dropping EJECT\n");
908 pr
= acpi_driver_data(device
);
910 printk(KERN_ERR PREFIX
911 "Driver data is NULL, dropping EJECT\n");
915 if ((pr
->id
< NR_CPUS
) && (cpu_present(pr
->id
)))
916 kobject_uevent(&device
->dev
.kobj
, KOBJ_OFFLINE
);
919 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
920 "Unsupported event [0x%x]\n", event
));
928 processor_walk_namespace_cb(acpi_handle handle
,
929 u32 lvl
, void *context
, void **rv
)
932 int *action
= context
;
933 acpi_object_type type
= 0;
935 status
= acpi_get_type(handle
, &type
);
936 if (ACPI_FAILURE(status
))
939 if (type
!= ACPI_TYPE_PROCESSOR
)
943 case INSTALL_NOTIFY_HANDLER
:
944 acpi_install_notify_handler(handle
,
946 acpi_processor_hotplug_notify
,
949 case UNINSTALL_NOTIFY_HANDLER
:
950 acpi_remove_notify_handler(handle
,
952 acpi_processor_hotplug_notify
);
961 static acpi_status
acpi_processor_hotadd_init(acpi_handle handle
, int *p_cpu
)
964 if (!is_processor_present(handle
)) {
968 if (acpi_map_lsapic(handle
, p_cpu
))
971 if (arch_register_cpu(*p_cpu
)) {
972 acpi_unmap_lsapic(*p_cpu
);
979 static int acpi_processor_handle_eject(struct acpi_processor
*pr
)
981 if (cpu_online(pr
->id
)) {
984 arch_unregister_cpu(pr
->id
);
985 acpi_unmap_lsapic(pr
->id
);
989 static acpi_status
acpi_processor_hotadd_init(acpi_handle handle
, int *p_cpu
)
993 static int acpi_processor_handle_eject(struct acpi_processor
*pr
)
1000 void acpi_processor_install_hotplug_notify(void)
1002 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1003 int action
= INSTALL_NOTIFY_HANDLER
;
1004 acpi_walk_namespace(ACPI_TYPE_PROCESSOR
,
1007 processor_walk_namespace_cb
, &action
, NULL
);
1009 register_hotcpu_notifier(&acpi_cpu_notifier
);
1013 void acpi_processor_uninstall_hotplug_notify(void)
1015 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1016 int action
= UNINSTALL_NOTIFY_HANDLER
;
1017 acpi_walk_namespace(ACPI_TYPE_PROCESSOR
,
1020 processor_walk_namespace_cb
, &action
, NULL
);
1022 unregister_hotcpu_notifier(&acpi_cpu_notifier
);
1026 * We keep the driver loaded even when ACPI is not running.
1027 * This is needed for the powernow-k8 driver, that works even without
1028 * ACPI, but needs symbols from this driver
1031 static int __init
acpi_processor_init(void)
1036 memset(&processors
, 0, sizeof(processors
));
1037 memset(&errata
, 0, sizeof(errata
));
1040 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT
, 0,
1041 (struct acpi_table_header
**)&madt
)))
1045 acpi_processor_dir
= proc_mkdir(ACPI_PROCESSOR_CLASS
, acpi_root_dir
);
1046 if (!acpi_processor_dir
)
1048 acpi_processor_dir
->owner
= THIS_MODULE
;
1050 result
= acpi_bus_register_driver(&acpi_processor_driver
);
1052 remove_proc_entry(ACPI_PROCESSOR_CLASS
, acpi_root_dir
);
1056 acpi_processor_install_hotplug_notify();
1058 acpi_thermal_cpufreq_init();
1060 acpi_processor_ppc_init();
1065 static void __exit
acpi_processor_exit(void)
1068 acpi_processor_ppc_exit();
1070 acpi_thermal_cpufreq_exit();
1072 acpi_processor_uninstall_hotplug_notify();
1074 acpi_bus_unregister_driver(&acpi_processor_driver
);
1076 remove_proc_entry(ACPI_PROCESSOR_CLASS
, acpi_root_dir
);
1081 module_init(acpi_processor_init
);
1082 module_exit(acpi_processor_exit
);
1084 EXPORT_SYMBOL(acpi_processor_set_thermal_limit
);
1086 MODULE_ALIAS("processor");