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_DRIVER_NAME "ACPI Processor Driver"
64 #define ACPI_PROCESSOR_DEVICE_NAME "Processor"
65 #define ACPI_PROCESSOR_FILE_INFO "info"
66 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
67 #define ACPI_PROCESSOR_FILE_LIMIT "limit"
68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
69 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81
71 #define ACPI_PROCESSOR_LIMIT_USER 0
72 #define ACPI_PROCESSOR_LIMIT_THERMAL 1
74 #define ACPI_STA_PRESENT 0x00000001
76 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
77 ACPI_MODULE_NAME("processor_core");
79 MODULE_AUTHOR("Paul Diefenbaugh");
80 MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME
);
81 MODULE_LICENSE("GPL");
83 static int acpi_processor_add(struct acpi_device
*device
);
84 static int acpi_processor_start(struct acpi_device
*device
);
85 static int acpi_processor_remove(struct acpi_device
*device
, int type
);
86 static int acpi_processor_info_open_fs(struct inode
*inode
, struct file
*file
);
87 static void acpi_processor_notify(acpi_handle handle
, u32 event
, void *data
);
88 static acpi_status
acpi_processor_hotadd_init(acpi_handle handle
, int *p_cpu
);
89 static int acpi_processor_handle_eject(struct acpi_processor
*pr
);
91 static struct acpi_driver acpi_processor_driver
= {
93 .class = ACPI_PROCESSOR_CLASS
,
94 .ids
= ACPI_PROCESSOR_HID
,
96 .add
= acpi_processor_add
,
97 .remove
= acpi_processor_remove
,
98 .start
= acpi_processor_start
,
102 #define INSTALL_NOTIFY_HANDLER 1
103 #define UNINSTALL_NOTIFY_HANDLER 2
105 static const struct file_operations acpi_processor_info_fops
= {
106 .open
= acpi_processor_info_open_fs
,
109 .release
= single_release
,
112 struct acpi_processor
*processors
[NR_CPUS
];
113 struct acpi_processor_errata errata __read_mostly
;
115 /* --------------------------------------------------------------------------
117 -------------------------------------------------------------------------- */
119 static int acpi_processor_errata_piix4(struct pci_dev
*dev
)
130 * Note that 'dev' references the PIIX4 ACPI Controller.
133 pci_read_config_byte(dev
, PCI_REVISION_ID
, &rev
);
137 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4 A-step\n"));
140 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4 B-step\n"));
143 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4E\n"));
146 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4M\n"));
149 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found unknown PIIX4\n"));
155 case 0: /* PIIX4 A-step */
156 case 1: /* PIIX4 B-step */
158 * See specification changes #13 ("Manual Throttle Duty Cycle")
159 * and #14 ("Enabling and Disabling Manual Throttle"), plus
160 * erratum #5 ("STPCLK# Deassertion Time") from the January
161 * 2002 PIIX4 specification update. Applies to only older
164 errata
.piix4
.throttle
= 1;
169 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
170 * Livelock") from the January 2002 PIIX4 specification update.
171 * Applies to all PIIX4 models.
177 * Find the PIIX4 IDE Controller and get the Bus Master IDE
178 * Status register address. We'll use this later to read
179 * each IDE controller's DMA status to make sure we catch all
182 dev
= pci_get_subsys(PCI_VENDOR_ID_INTEL
,
183 PCI_DEVICE_ID_INTEL_82371AB
,
184 PCI_ANY_ID
, PCI_ANY_ID
, NULL
);
186 errata
.piix4
.bmisx
= pci_resource_start(dev
, 4);
193 * Find the PIIX4 ISA Controller and read the Motherboard
194 * DMA controller's status to see if Type-F (Fast) DMA mode
195 * is enabled (bit 7) on either channel. Note that we'll
196 * disable C3 support if this is enabled, as some legacy
197 * devices won't operate well if fast DMA is disabled.
199 dev
= pci_get_subsys(PCI_VENDOR_ID_INTEL
,
200 PCI_DEVICE_ID_INTEL_82371AB_0
,
201 PCI_ANY_ID
, PCI_ANY_ID
, NULL
);
203 pci_read_config_byte(dev
, 0x76, &value1
);
204 pci_read_config_byte(dev
, 0x77, &value2
);
205 if ((value1
& 0x80) || (value2
& 0x80))
206 errata
.piix4
.fdma
= 1;
213 if (errata
.piix4
.bmisx
)
214 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
215 "Bus master activity detection (BM-IDE) erratum enabled\n"));
216 if (errata
.piix4
.fdma
)
217 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
218 "Type-F DMA livelock erratum (C3 disabled)\n"));
223 static int acpi_processor_errata(struct acpi_processor
*pr
)
226 struct pci_dev
*dev
= NULL
;
235 dev
= pci_get_subsys(PCI_VENDOR_ID_INTEL
,
236 PCI_DEVICE_ID_INTEL_82371AB_3
, PCI_ANY_ID
,
239 result
= acpi_processor_errata_piix4(dev
);
246 /* --------------------------------------------------------------------------
247 Common ACPI processor functions
248 -------------------------------------------------------------------------- */
251 * _PDC is required for a BIOS-OS handshake for most of the newer
252 * ACPI processor features.
254 static int acpi_processor_set_pdc(struct acpi_processor
*pr
)
256 struct acpi_object_list
*pdc_in
= pr
->pdc
;
257 acpi_status status
= AE_OK
;
263 status
= acpi_evaluate_object(pr
->handle
, "_PDC", pdc_in
, NULL
);
265 if (ACPI_FAILURE(status
))
266 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
267 "Could not evaluate _PDC, using legacy perf. control...\n"));
272 /* --------------------------------------------------------------------------
274 -------------------------------------------------------------------------- */
276 static struct proc_dir_entry
*acpi_processor_dir
= NULL
;
278 static int acpi_processor_info_seq_show(struct seq_file
*seq
, void *offset
)
280 struct acpi_processor
*pr
= seq
->private;
286 seq_printf(seq
, "processor id: %d\n"
288 "bus mastering control: %s\n"
289 "power management: %s\n"
290 "throttling control: %s\n"
291 "limit interface: %s\n",
294 pr
->flags
.bm_control
? "yes" : "no",
295 pr
->flags
.power
? "yes" : "no",
296 pr
->flags
.throttling
? "yes" : "no",
297 pr
->flags
.limit
? "yes" : "no");
303 static int acpi_processor_info_open_fs(struct inode
*inode
, struct file
*file
)
305 return single_open(file
, acpi_processor_info_seq_show
,
309 static int acpi_processor_add_fs(struct acpi_device
*device
)
311 struct proc_dir_entry
*entry
= NULL
;
314 if (!acpi_device_dir(device
)) {
315 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
317 if (!acpi_device_dir(device
))
320 acpi_device_dir(device
)->owner
= THIS_MODULE
;
323 entry
= create_proc_entry(ACPI_PROCESSOR_FILE_INFO
,
324 S_IRUGO
, acpi_device_dir(device
));
328 entry
->proc_fops
= &acpi_processor_info_fops
;
329 entry
->data
= acpi_driver_data(device
);
330 entry
->owner
= THIS_MODULE
;
333 /* 'throttling' [R/W] */
334 entry
= create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING
,
335 S_IFREG
| S_IRUGO
| S_IWUSR
,
336 acpi_device_dir(device
));
340 entry
->proc_fops
= &acpi_processor_throttling_fops
;
341 entry
->data
= acpi_driver_data(device
);
342 entry
->owner
= THIS_MODULE
;
346 entry
= create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT
,
347 S_IFREG
| S_IRUGO
| S_IWUSR
,
348 acpi_device_dir(device
));
352 entry
->proc_fops
= &acpi_processor_limit_fops
;
353 entry
->data
= acpi_driver_data(device
);
354 entry
->owner
= THIS_MODULE
;
360 static int acpi_processor_remove_fs(struct acpi_device
*device
)
363 if (acpi_device_dir(device
)) {
364 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO
,
365 acpi_device_dir(device
));
366 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING
,
367 acpi_device_dir(device
));
368 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT
,
369 acpi_device_dir(device
));
370 remove_proc_entry(acpi_device_bid(device
), acpi_processor_dir
);
371 acpi_device_dir(device
) = NULL
;
377 /* Use the acpiid in MADT to map cpus in case of SMP */
380 static int get_cpu_id(acpi_handle handle
, u32 acpi_id
) {return -1;}
383 static struct acpi_table_madt
*madt
;
385 static int map_lapic_id(struct acpi_subtable_header
*entry
,
386 u32 acpi_id
, int *apic_id
)
388 struct acpi_madt_local_apic
*lapic
=
389 (struct acpi_madt_local_apic
*)entry
;
390 if ((lapic
->lapic_flags
& ACPI_MADT_ENABLED
) &&
391 lapic
->processor_id
== acpi_id
) {
392 *apic_id
= lapic
->id
;
398 static int map_lsapic_id(struct acpi_subtable_header
*entry
,
399 u32 acpi_id
, int *apic_id
)
401 struct acpi_madt_local_sapic
*lsapic
=
402 (struct acpi_madt_local_sapic
*)entry
;
403 /* Only check enabled APICs*/
404 if (lsapic
->lapic_flags
& ACPI_MADT_ENABLED
) {
405 /* First check against id */
406 if (lsapic
->processor_id
== acpi_id
) {
407 *apic_id
= lsapic
->id
;
409 /* Check against optional uid */
410 } else if (entry
->length
>= 16 &&
411 lsapic
->uid
== acpi_id
) {
412 *apic_id
= lsapic
->uid
;
420 #define arch_cpu_to_apicid ia64_cpu_to_sapicid
422 #define arch_cpu_to_apicid x86_cpu_to_apicid
425 static int map_madt_entry(u32 acpi_id
)
427 unsigned long madt_end
, entry
;
433 entry
= (unsigned long)madt
;
434 madt_end
= entry
+ madt
->header
.length
;
436 /* Parse all entries looking for a match. */
438 entry
+= sizeof(struct acpi_table_madt
);
439 while (entry
+ sizeof(struct acpi_subtable_header
) < madt_end
) {
440 struct acpi_subtable_header
*header
=
441 (struct acpi_subtable_header
*)entry
;
442 if (header
->type
== ACPI_MADT_TYPE_LOCAL_APIC
) {
443 if (map_lapic_id(header
, acpi_id
, &apic_id
))
445 } else if (header
->type
== ACPI_MADT_TYPE_LOCAL_SAPIC
) {
446 if (map_lsapic_id(header
, acpi_id
, &apic_id
))
449 entry
+= header
->length
;
454 static int map_mat_entry(acpi_handle handle
, u32 acpi_id
)
456 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
457 union acpi_object
*obj
;
458 struct acpi_subtable_header
*header
;
461 if (ACPI_FAILURE(acpi_evaluate_object(handle
, "_MAT", NULL
, &buffer
)))
464 if (!buffer
.length
|| !buffer
.pointer
)
467 obj
= buffer
.pointer
;
468 if (obj
->type
!= ACPI_TYPE_BUFFER
||
469 obj
->buffer
.length
< sizeof(struct acpi_subtable_header
)) {
473 header
= (struct acpi_subtable_header
*)obj
->buffer
.pointer
;
474 if (header
->type
== ACPI_MADT_TYPE_LOCAL_APIC
) {
475 map_lapic_id(header
, acpi_id
, &apic_id
);
476 } else if (header
->type
== ACPI_MADT_TYPE_LOCAL_SAPIC
) {
477 map_lsapic_id(header
, acpi_id
, &apic_id
);
482 kfree(buffer
.pointer
);
486 static int get_cpu_id(acpi_handle handle
, u32 acpi_id
)
491 apic_id
= map_mat_entry(handle
, acpi_id
);
493 apic_id
= map_madt_entry(acpi_id
);
497 for (i
= 0; i
< NR_CPUS
; ++i
) {
498 if (arch_cpu_to_apicid
[i
] == apic_id
)
505 /* --------------------------------------------------------------------------
507 -------------------------------------------------------------------------- */
509 static int acpi_processor_get_info(struct acpi_processor
*pr
, unsigned has_uid
)
511 acpi_status status
= 0;
512 union acpi_object object
= { 0 };
513 struct acpi_buffer buffer
= { sizeof(union acpi_object
), &object
};
515 static int cpu0_initialized
;
521 if (num_online_cpus() > 1)
524 acpi_processor_errata(pr
);
527 * Check to see if we have bus mastering arbitration control. This
528 * is required for proper C3 usage (to maintain cache coherency).
530 if (acpi_gbl_FADT
.pm2_control_block
&& acpi_gbl_FADT
.pm2_control_length
) {
531 pr
->flags
.bm_control
= 1;
532 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
533 "Bus mastering arbitration control present\n"));
535 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
536 "No bus mastering arbitration control\n"));
538 /* Check if it is a Device with HID and UID */
541 status
= acpi_evaluate_integer(pr
->handle
, METHOD_NAME__UID
,
543 if (ACPI_FAILURE(status
)) {
544 printk(KERN_ERR PREFIX
"Evaluating processor _UID\n");
550 * Evalute the processor object. Note that it is common on SMP to
551 * have the first (boot) processor with a valid PBLK address while
552 * all others have a NULL address.
554 status
= acpi_evaluate_object(pr
->handle
, NULL
, NULL
, &buffer
);
555 if (ACPI_FAILURE(status
)) {
556 printk(KERN_ERR PREFIX
"Evaluating processor object\n");
561 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
562 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
564 pr
->acpi_id
= object
.processor
.proc_id
;
566 cpu_index
= get_cpu_id(pr
->handle
, pr
->acpi_id
);
568 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
569 if (!cpu0_initialized
&& (cpu_index
== -1) &&
570 (num_online_cpus() == 1)) {
574 cpu0_initialized
= 1;
579 * Extra Processor objects may be enumerated on MP systems with
580 * less than the max # of CPUs. They should be ignored _iff
581 * they are physically not present.
585 (acpi_processor_hotadd_init(pr
->handle
, &pr
->id
))) {
590 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Processor [%d:%d]\n", pr
->id
,
593 if (!object
.processor
.pblk_address
)
594 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No PBLK (NULL address)\n"));
595 else if (object
.processor
.pblk_length
!= 6)
596 printk(KERN_ERR PREFIX
"Invalid PBLK length [%d]\n",
597 object
.processor
.pblk_length
);
599 pr
->throttling
.address
= object
.processor
.pblk_address
;
600 pr
->throttling
.duty_offset
= acpi_gbl_FADT
.duty_offset
;
601 pr
->throttling
.duty_width
= acpi_gbl_FADT
.duty_width
;
603 pr
->pblk
= object
.processor
.pblk_address
;
606 * We don't care about error returns - we just try to mark
607 * these reserved so that nobody else is confused into thinking
608 * that this region might be unused..
610 * (In particular, allocating the IO range for Cardbus)
612 request_region(pr
->throttling
.address
, 6, "ACPI CPU throttle");
615 #ifdef CONFIG_CPU_FREQ
616 acpi_processor_ppc_has_changed(pr
);
618 acpi_processor_get_throttling_info(pr
);
619 acpi_processor_get_limit_info(pr
);
624 static void *processor_device_array
[NR_CPUS
];
626 static int __cpuinit
acpi_processor_start(struct acpi_device
*device
)
629 acpi_status status
= AE_OK
;
630 struct acpi_processor
*pr
;
633 pr
= acpi_driver_data(device
);
635 result
= acpi_processor_get_info(pr
, device
->flags
.unique_id
);
637 /* Processor is physically not present */
641 BUG_ON((pr
->id
>= NR_CPUS
) || (pr
->id
< 0));
645 * ACPI id of processors can be reported wrongly by the BIOS.
646 * Don't trust it blindly
648 if (processor_device_array
[pr
->id
] != NULL
&&
649 processor_device_array
[pr
->id
] != device
) {
650 printk(KERN_WARNING
"BIOS reported wrong ACPI id"
651 "for the processor\n");
654 processor_device_array
[pr
->id
] = device
;
656 processors
[pr
->id
] = pr
;
658 result
= acpi_processor_add_fs(device
);
662 status
= acpi_install_notify_handler(pr
->handle
, ACPI_DEVICE_NOTIFY
,
663 acpi_processor_notify
, pr
);
665 /* _PDC call should be done before doing anything else (if reqd.). */
666 arch_acpi_processor_init_pdc(pr
);
667 acpi_processor_set_pdc(pr
);
669 acpi_processor_power_init(pr
, device
);
671 if (pr
->flags
.throttling
) {
672 printk(KERN_INFO PREFIX
"%s [%s] (supports",
673 acpi_device_name(device
), acpi_device_bid(device
));
674 printk(" %d throttling states", pr
->throttling
.state_count
);
683 static void acpi_processor_notify(acpi_handle handle
, u32 event
, void *data
)
685 struct acpi_processor
*pr
= data
;
686 struct acpi_device
*device
= NULL
;
692 if (acpi_bus_get_device(pr
->handle
, &device
))
696 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE
:
697 acpi_processor_ppc_has_changed(pr
);
698 acpi_bus_generate_event(device
, event
,
699 pr
->performance_platform_limit
);
701 case ACPI_PROCESSOR_NOTIFY_POWER
:
702 acpi_processor_cst_has_changed(pr
);
703 acpi_bus_generate_event(device
, event
, 0);
706 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
707 "Unsupported event [0x%x]\n", event
));
714 static int acpi_processor_add(struct acpi_device
*device
)
716 struct acpi_processor
*pr
= NULL
;
722 pr
= kzalloc(sizeof(struct acpi_processor
), GFP_KERNEL
);
726 pr
->handle
= device
->handle
;
727 strcpy(acpi_device_name(device
), ACPI_PROCESSOR_DEVICE_NAME
);
728 strcpy(acpi_device_class(device
), ACPI_PROCESSOR_CLASS
);
729 acpi_driver_data(device
) = pr
;
734 static int acpi_processor_remove(struct acpi_device
*device
, int type
)
736 acpi_status status
= AE_OK
;
737 struct acpi_processor
*pr
= NULL
;
740 if (!device
|| !acpi_driver_data(device
))
743 pr
= acpi_driver_data(device
);
745 if (pr
->id
>= NR_CPUS
) {
750 if (type
== ACPI_BUS_REMOVAL_EJECT
) {
751 if (acpi_processor_handle_eject(pr
))
755 acpi_processor_power_exit(pr
, device
);
757 status
= acpi_remove_notify_handler(pr
->handle
, ACPI_DEVICE_NOTIFY
,
758 acpi_processor_notify
);
760 acpi_processor_remove_fs(device
);
762 processors
[pr
->id
] = NULL
;
769 #ifdef CONFIG_ACPI_HOTPLUG_CPU
770 /****************************************************************************
771 * Acpi processor hotplug support *
772 ****************************************************************************/
774 static int is_processor_present(acpi_handle handle
);
776 static int is_processor_present(acpi_handle handle
)
779 unsigned long sta
= 0;
782 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
783 if (ACPI_FAILURE(status
) || !(sta
& ACPI_STA_PRESENT
)) {
784 ACPI_EXCEPTION((AE_INFO
, status
, "Processor Device is not present"));
791 int acpi_processor_device_add(acpi_handle handle
, struct acpi_device
**device
)
794 struct acpi_device
*pdev
;
795 struct acpi_processor
*pr
;
798 if (acpi_get_parent(handle
, &phandle
)) {
802 if (acpi_bus_get_device(phandle
, &pdev
)) {
806 if (acpi_bus_add(device
, pdev
, handle
, ACPI_BUS_TYPE_PROCESSOR
)) {
810 acpi_bus_start(*device
);
812 pr
= acpi_driver_data(*device
);
816 if ((pr
->id
>= 0) && (pr
->id
< NR_CPUS
)) {
817 kobject_uevent(&(*device
)->dev
.kobj
, KOBJ_ONLINE
);
823 acpi_processor_hotplug_notify(acpi_handle handle
, u32 event
, void *data
)
825 struct acpi_processor
*pr
;
826 struct acpi_device
*device
= NULL
;
831 case ACPI_NOTIFY_BUS_CHECK
:
832 case ACPI_NOTIFY_DEVICE_CHECK
:
833 printk("Processor driver received %s event\n",
834 (event
== ACPI_NOTIFY_BUS_CHECK
) ?
835 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
837 if (!is_processor_present(handle
))
840 if (acpi_bus_get_device(handle
, &device
)) {
841 result
= acpi_processor_device_add(handle
, &device
);
843 printk(KERN_ERR PREFIX
844 "Unable to add the device\n");
848 pr
= acpi_driver_data(device
);
850 printk(KERN_ERR PREFIX
"Driver data is NULL\n");
854 if (pr
->id
>= 0 && (pr
->id
< NR_CPUS
)) {
855 kobject_uevent(&device
->dev
.kobj
, KOBJ_OFFLINE
);
859 result
= acpi_processor_start(device
);
860 if ((!result
) && ((pr
->id
>= 0) && (pr
->id
< NR_CPUS
))) {
861 kobject_uevent(&device
->dev
.kobj
, KOBJ_ONLINE
);
863 printk(KERN_ERR PREFIX
"Device [%s] failed to start\n",
864 acpi_device_bid(device
));
867 case ACPI_NOTIFY_EJECT_REQUEST
:
868 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
869 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
871 if (acpi_bus_get_device(handle
, &device
)) {
872 printk(KERN_ERR PREFIX
873 "Device don't exist, dropping EJECT\n");
876 pr
= acpi_driver_data(device
);
878 printk(KERN_ERR PREFIX
879 "Driver data is NULL, dropping EJECT\n");
883 if ((pr
->id
< NR_CPUS
) && (cpu_present(pr
->id
)))
884 kobject_uevent(&device
->dev
.kobj
, KOBJ_OFFLINE
);
887 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
888 "Unsupported event [0x%x]\n", event
));
896 processor_walk_namespace_cb(acpi_handle handle
,
897 u32 lvl
, void *context
, void **rv
)
900 int *action
= context
;
901 acpi_object_type type
= 0;
903 status
= acpi_get_type(handle
, &type
);
904 if (ACPI_FAILURE(status
))
907 if (type
!= ACPI_TYPE_PROCESSOR
)
911 case INSTALL_NOTIFY_HANDLER
:
912 acpi_install_notify_handler(handle
,
914 acpi_processor_hotplug_notify
,
917 case UNINSTALL_NOTIFY_HANDLER
:
918 acpi_remove_notify_handler(handle
,
920 acpi_processor_hotplug_notify
);
929 static acpi_status
acpi_processor_hotadd_init(acpi_handle handle
, int *p_cpu
)
932 if (!is_processor_present(handle
)) {
936 if (acpi_map_lsapic(handle
, p_cpu
))
939 if (arch_register_cpu(*p_cpu
)) {
940 acpi_unmap_lsapic(*p_cpu
);
947 static int acpi_processor_handle_eject(struct acpi_processor
*pr
)
949 if (cpu_online(pr
->id
)) {
952 arch_unregister_cpu(pr
->id
);
953 acpi_unmap_lsapic(pr
->id
);
957 static acpi_status
acpi_processor_hotadd_init(acpi_handle handle
, int *p_cpu
)
961 static int acpi_processor_handle_eject(struct acpi_processor
*pr
)
968 void acpi_processor_install_hotplug_notify(void)
970 #ifdef CONFIG_ACPI_HOTPLUG_CPU
971 int action
= INSTALL_NOTIFY_HANDLER
;
972 acpi_walk_namespace(ACPI_TYPE_PROCESSOR
,
975 processor_walk_namespace_cb
, &action
, NULL
);
980 void acpi_processor_uninstall_hotplug_notify(void)
982 #ifdef CONFIG_ACPI_HOTPLUG_CPU
983 int action
= UNINSTALL_NOTIFY_HANDLER
;
984 acpi_walk_namespace(ACPI_TYPE_PROCESSOR
,
987 processor_walk_namespace_cb
, &action
, NULL
);
992 * We keep the driver loaded even when ACPI is not running.
993 * This is needed for the powernow-k8 driver, that works even without
994 * ACPI, but needs symbols from this driver
997 static int __init
acpi_processor_init(void)
1002 memset(&processors
, 0, sizeof(processors
));
1003 memset(&errata
, 0, sizeof(errata
));
1006 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT
, 0,
1007 (struct acpi_table_header
**)&madt
)))
1011 acpi_processor_dir
= proc_mkdir(ACPI_PROCESSOR_CLASS
, acpi_root_dir
);
1012 if (!acpi_processor_dir
)
1014 acpi_processor_dir
->owner
= THIS_MODULE
;
1016 result
= acpi_bus_register_driver(&acpi_processor_driver
);
1018 remove_proc_entry(ACPI_PROCESSOR_CLASS
, acpi_root_dir
);
1022 acpi_processor_install_hotplug_notify();
1024 acpi_thermal_cpufreq_init();
1026 acpi_processor_ppc_init();
1031 static void __exit
acpi_processor_exit(void)
1034 acpi_processor_ppc_exit();
1036 acpi_thermal_cpufreq_exit();
1038 acpi_processor_uninstall_hotplug_notify();
1040 acpi_bus_unregister_driver(&acpi_processor_driver
);
1042 remove_proc_entry(ACPI_PROCESSOR_CLASS
, acpi_root_dir
);
1047 module_init(acpi_processor_init
);
1048 module_exit(acpi_processor_exit
);
1050 EXPORT_SYMBOL(acpi_processor_set_thermal_limit
);
1052 MODULE_ALIAS("processor");