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/dmi.h>
44 #include <linux/moduleparam.h>
45 #include <linux/cpuidle.h>
46 #include <linux/slab.h>
50 #include <asm/delay.h>
51 #include <asm/uaccess.h>
52 #include <asm/processor.h>
56 #include <acpi/acpi_bus.h>
57 #include <acpi/acpi_drivers.h>
58 #include <acpi/processor.h>
60 #define PREFIX "ACPI: "
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_driver");
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_remove(struct acpi_device
*device
, int type
);
83 static void acpi_processor_notify(struct acpi_device
*device
, u32 event
);
84 static acpi_status
acpi_processor_hotadd_init(struct acpi_processor
*pr
);
85 static int acpi_processor_handle_eject(struct acpi_processor
*pr
);
86 static int acpi_processor_start(struct acpi_processor
*pr
);
88 static const struct acpi_device_id processor_device_ids
[] = {
89 {ACPI_PROCESSOR_OBJECT_HID
, 0},
93 MODULE_DEVICE_TABLE(acpi
, processor_device_ids
);
95 static struct acpi_driver acpi_processor_driver
= {
97 .class = ACPI_PROCESSOR_CLASS
,
98 .ids
= processor_device_ids
,
100 .add
= acpi_processor_add
,
101 .remove
= acpi_processor_remove
,
102 .suspend
= acpi_processor_suspend
,
103 .resume
= acpi_processor_resume
,
104 .notify
= acpi_processor_notify
,
108 #define INSTALL_NOTIFY_HANDLER 1
109 #define UNINSTALL_NOTIFY_HANDLER 2
111 DEFINE_PER_CPU(struct acpi_processor
*, processors
);
112 EXPORT_PER_CPU_SYMBOL(processors
);
114 struct acpi_processor_errata errata __read_mostly
;
116 /* --------------------------------------------------------------------------
118 -------------------------------------------------------------------------- */
120 static int acpi_processor_errata_piix4(struct pci_dev
*dev
)
130 * Note that 'dev' references the PIIX4 ACPI Controller.
133 switch (dev
->revision
) {
135 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4 A-step\n"));
138 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4 B-step\n"));
141 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4E\n"));
144 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found PIIX4M\n"));
147 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found unknown PIIX4\n"));
151 switch (dev
->revision
) {
153 case 0: /* PIIX4 A-step */
154 case 1: /* PIIX4 B-step */
156 * See specification changes #13 ("Manual Throttle Duty Cycle")
157 * and #14 ("Enabling and Disabling Manual Throttle"), plus
158 * erratum #5 ("STPCLK# Deassertion Time") from the January
159 * 2002 PIIX4 specification update. Applies to only older
162 errata
.piix4
.throttle
= 1;
167 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
168 * Livelock") from the January 2002 PIIX4 specification update.
169 * Applies to all PIIX4 models.
175 * Find the PIIX4 IDE Controller and get the Bus Master IDE
176 * Status register address. We'll use this later to read
177 * each IDE controller's DMA status to make sure we catch all
180 dev
= pci_get_subsys(PCI_VENDOR_ID_INTEL
,
181 PCI_DEVICE_ID_INTEL_82371AB
,
182 PCI_ANY_ID
, PCI_ANY_ID
, NULL
);
184 errata
.piix4
.bmisx
= pci_resource_start(dev
, 4);
191 * Find the PIIX4 ISA Controller and read the Motherboard
192 * DMA controller's status to see if Type-F (Fast) DMA mode
193 * is enabled (bit 7) on either channel. Note that we'll
194 * disable C3 support if this is enabled, as some legacy
195 * devices won't operate well if fast DMA is disabled.
197 dev
= pci_get_subsys(PCI_VENDOR_ID_INTEL
,
198 PCI_DEVICE_ID_INTEL_82371AB_0
,
199 PCI_ANY_ID
, PCI_ANY_ID
, NULL
);
201 pci_read_config_byte(dev
, 0x76, &value1
);
202 pci_read_config_byte(dev
, 0x77, &value2
);
203 if ((value1
& 0x80) || (value2
& 0x80))
204 errata
.piix4
.fdma
= 1;
211 if (errata
.piix4
.bmisx
)
212 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
213 "Bus master activity detection (BM-IDE) erratum enabled\n"));
214 if (errata
.piix4
.fdma
)
215 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
216 "Type-F DMA livelock erratum (C3 disabled)\n"));
221 static int acpi_processor_errata(struct acpi_processor
*pr
)
224 struct pci_dev
*dev
= NULL
;
233 dev
= pci_get_subsys(PCI_VENDOR_ID_INTEL
,
234 PCI_DEVICE_ID_INTEL_82371AB_3
, PCI_ANY_ID
,
237 result
= acpi_processor_errata_piix4(dev
);
244 /* --------------------------------------------------------------------------
246 -------------------------------------------------------------------------- */
248 static int acpi_processor_get_info(struct acpi_device
*device
)
250 acpi_status status
= 0;
251 union acpi_object object
= { 0 };
252 struct acpi_buffer buffer
= { sizeof(union acpi_object
), &object
};
253 struct acpi_processor
*pr
;
254 int cpu_index
, device_declaration
= 0;
255 static int cpu0_initialized
;
257 pr
= acpi_driver_data(device
);
261 if (num_online_cpus() > 1)
264 acpi_processor_errata(pr
);
267 * Check to see if we have bus mastering arbitration control. This
268 * is required for proper C3 usage (to maintain cache coherency).
270 if (acpi_gbl_FADT
.pm2_control_block
&& acpi_gbl_FADT
.pm2_control_length
) {
271 pr
->flags
.bm_control
= 1;
272 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
273 "Bus mastering arbitration control present\n"));
275 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
276 "No bus mastering arbitration control\n"));
278 if (!strcmp(acpi_device_hid(device
), ACPI_PROCESSOR_OBJECT_HID
)) {
279 /* Declared with "Processor" statement; match ProcessorID */
280 status
= acpi_evaluate_object(pr
->handle
, NULL
, NULL
, &buffer
);
281 if (ACPI_FAILURE(status
)) {
282 printk(KERN_ERR PREFIX
"Evaluating processor object\n");
287 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
288 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
291 pr
->acpi_id
= object
.processor
.proc_id
;
294 * Declared with "Device" statement; match _UID.
295 * Note that we don't handle string _UIDs yet.
297 unsigned long long value
;
298 status
= acpi_evaluate_integer(pr
->handle
, METHOD_NAME__UID
,
300 if (ACPI_FAILURE(status
)) {
301 printk(KERN_ERR PREFIX
302 "Evaluating processor _UID [%#x]\n", status
);
305 device_declaration
= 1;
308 cpu_index
= acpi_get_cpuid(pr
->handle
, device_declaration
, pr
->acpi_id
);
310 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
311 if (!cpu0_initialized
&& (cpu_index
== -1) &&
312 (num_online_cpus() == 1)) {
316 cpu0_initialized
= 1;
321 * Extra Processor objects may be enumerated on MP systems with
322 * less than the max # of CPUs. They should be ignored _iff
323 * they are physically not present.
326 if (ACPI_FAILURE(acpi_processor_hotadd_init(pr
)))
330 * On some boxes several processors use the same processor bus id.
331 * But they are located in different scope. For example:
334 * Rename the processor device bus id. And the new bus id will be
335 * generated as the following format:
338 sprintf(acpi_device_bid(device
), "CPU%X", pr
->id
);
339 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Processor [%d:%d]\n", pr
->id
,
342 if (!object
.processor
.pblk_address
)
343 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No PBLK (NULL address)\n"));
344 else if (object
.processor
.pblk_length
!= 6)
345 printk(KERN_ERR PREFIX
"Invalid PBLK length [%d]\n",
346 object
.processor
.pblk_length
);
348 pr
->throttling
.address
= object
.processor
.pblk_address
;
349 pr
->throttling
.duty_offset
= acpi_gbl_FADT
.duty_offset
;
350 pr
->throttling
.duty_width
= acpi_gbl_FADT
.duty_width
;
352 pr
->pblk
= object
.processor
.pblk_address
;
355 * We don't care about error returns - we just try to mark
356 * these reserved so that nobody else is confused into thinking
357 * that this region might be unused..
359 * (In particular, allocating the IO range for Cardbus)
361 request_region(pr
->throttling
.address
, 6, "ACPI CPU throttle");
365 * If ACPI describes a slot number for this CPU, we can use it
366 * ensure we get the right value in the "physical id" field
369 status
= acpi_evaluate_object(pr
->handle
, "_SUN", NULL
, &buffer
);
370 if (ACPI_SUCCESS(status
))
371 arch_fix_phys_package_id(pr
->id
, object
.integer
.value
);
376 static DEFINE_PER_CPU(void *, processor_device_array
);
378 static void acpi_processor_notify(struct acpi_device
*device
, u32 event
)
380 struct acpi_processor
*pr
= acpi_driver_data(device
);
387 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE
:
388 saved
= pr
->performance_platform_limit
;
389 acpi_processor_ppc_has_changed(pr
, 1);
390 if (saved
== pr
->performance_platform_limit
)
392 acpi_bus_generate_proc_event(device
, event
,
393 pr
->performance_platform_limit
);
394 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
395 dev_name(&device
->dev
), event
,
396 pr
->performance_platform_limit
);
398 case ACPI_PROCESSOR_NOTIFY_POWER
:
399 acpi_processor_cst_has_changed(pr
);
400 acpi_bus_generate_proc_event(device
, event
, 0);
401 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
402 dev_name(&device
->dev
), event
, 0);
404 case ACPI_PROCESSOR_NOTIFY_THROTTLING
:
405 acpi_processor_tstate_has_changed(pr
);
406 acpi_bus_generate_proc_event(device
, event
, 0);
407 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
408 dev_name(&device
->dev
), event
, 0);
410 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
411 "Unsupported event [0x%x]\n", event
));
418 static int acpi_cpu_soft_notify(struct notifier_block
*nfb
,
419 unsigned long action
, void *hcpu
)
421 unsigned int cpu
= (unsigned long)hcpu
;
422 struct acpi_processor
*pr
= per_cpu(processors
, cpu
);
424 if (action
== CPU_ONLINE
&& pr
) {
425 /* CPU got physically hotplugged and onlined the first time:
426 * Initialize missing things
428 if (pr
->flags
.need_hotplug_init
) {
429 struct cpuidle_driver
*idle_driver
=
430 cpuidle_get_driver();
432 printk(KERN_INFO
"Will online and init hotplugged "
433 "CPU: %d\n", pr
->id
);
434 WARN(acpi_processor_start(pr
), "Failed to start CPU:"
436 pr
->flags
.need_hotplug_init
= 0;
437 if (idle_driver
&& !strcmp(idle_driver
->name
,
439 intel_idle_cpu_init(pr
->id
);
441 /* Normal CPU soft online event */
443 acpi_processor_ppc_has_changed(pr
, 0);
444 acpi_processor_cst_has_changed(pr
);
445 acpi_processor_reevaluate_tstate(pr
, action
);
446 acpi_processor_tstate_has_changed(pr
);
449 if (action
== CPU_DEAD
&& pr
) {
450 /* invalidate the flag.throttling after one CPU is offline */
451 acpi_processor_reevaluate_tstate(pr
, action
);
456 static struct notifier_block acpi_cpu_notifier
=
458 .notifier_call
= acpi_cpu_soft_notify
,
462 * acpi_processor_start() is called by the cpu_hotplug_notifier func:
463 * acpi_cpu_soft_notify(). Getting it __cpuinit{data} is difficult, the
464 * root cause seem to be that acpi_processor_uninstall_hotplug_notify()
465 * is in the module_exit (__exit) func. Allowing acpi_processor_start()
466 * to not be in __cpuinit section, but being called from __cpuinit funcs
467 * via __ref looks like the right thing to do here.
469 static __ref
int acpi_processor_start(struct acpi_processor
*pr
)
471 struct acpi_device
*device
= per_cpu(processor_device_array
, pr
->id
);
474 #ifdef CONFIG_CPU_FREQ
475 acpi_processor_ppc_has_changed(pr
, 0);
476 acpi_processor_load_module(pr
);
478 acpi_processor_get_throttling_info(pr
);
479 acpi_processor_get_limit_info(pr
);
481 if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver
)
482 acpi_processor_power_init(pr
, device
);
484 pr
->cdev
= thermal_cooling_device_register("Processor", device
,
485 &processor_cooling_ops
);
486 if (IS_ERR(pr
->cdev
)) {
487 result
= PTR_ERR(pr
->cdev
);
491 dev_dbg(&device
->dev
, "registered as cooling_device%d\n",
494 result
= sysfs_create_link(&device
->dev
.kobj
,
495 &pr
->cdev
->device
.kobj
,
498 printk(KERN_ERR PREFIX
"Create sysfs link\n");
499 goto err_thermal_unregister
;
501 result
= sysfs_create_link(&pr
->cdev
->device
.kobj
,
505 printk(KERN_ERR PREFIX
"Create sysfs link\n");
506 goto err_remove_sysfs_thermal
;
511 err_remove_sysfs_thermal
:
512 sysfs_remove_link(&device
->dev
.kobj
, "thermal_cooling");
513 err_thermal_unregister
:
514 thermal_cooling_device_unregister(pr
->cdev
);
516 acpi_processor_power_exit(pr
, device
);
522 * Do not put anything in here which needs the core to be online.
523 * For example MSR access or setting up things which check for cpuinfo_x86
524 * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
525 * Such things have to be put in and set up above in acpi_processor_start()
527 static int __cpuinit
acpi_processor_add(struct acpi_device
*device
)
529 struct acpi_processor
*pr
= NULL
;
533 pr
= kzalloc(sizeof(struct acpi_processor
), GFP_KERNEL
);
537 if (!zalloc_cpumask_var(&pr
->throttling
.shared_cpu_map
, GFP_KERNEL
)) {
542 pr
->handle
= device
->handle
;
543 strcpy(acpi_device_name(device
), ACPI_PROCESSOR_DEVICE_NAME
);
544 strcpy(acpi_device_class(device
), ACPI_PROCESSOR_CLASS
);
545 device
->driver_data
= pr
;
547 result
= acpi_processor_get_info(device
);
549 /* Processor is physically not present */
554 if (pr
->id
>= setup_max_cpus
&& pr
->id
!= 0)
558 BUG_ON((pr
->id
>= nr_cpu_ids
) || (pr
->id
< 0));
562 * ACPI id of processors can be reported wrongly by the BIOS.
563 * Don't trust it blindly
565 if (per_cpu(processor_device_array
, pr
->id
) != NULL
&&
566 per_cpu(processor_device_array
, pr
->id
) != device
) {
567 printk(KERN_WARNING
"BIOS reported wrong ACPI id "
568 "for the processor\n");
570 goto err_free_cpumask
;
572 per_cpu(processor_device_array
, pr
->id
) = device
;
574 per_cpu(processors
, pr
->id
) = pr
;
576 dev
= get_cpu_device(pr
->id
);
577 if (sysfs_create_link(&device
->dev
.kobj
, &dev
->kobj
, "sysdev")) {
579 goto err_free_cpumask
;
583 * Do not start hotplugged CPUs now, but when they
584 * are onlined the first time
586 if (pr
->flags
.need_hotplug_init
)
589 result
= acpi_processor_start(pr
);
591 goto err_remove_sysfs
;
596 sysfs_remove_link(&device
->dev
.kobj
, "sysdev");
598 free_cpumask_var(pr
->throttling
.shared_cpu_map
);
603 static int acpi_processor_remove(struct acpi_device
*device
, int type
)
605 struct acpi_processor
*pr
= NULL
;
608 if (!device
|| !acpi_driver_data(device
))
611 pr
= acpi_driver_data(device
);
613 if (pr
->id
>= nr_cpu_ids
)
616 if (type
== ACPI_BUS_REMOVAL_EJECT
) {
617 if (acpi_processor_handle_eject(pr
))
621 acpi_processor_power_exit(pr
, device
);
623 sysfs_remove_link(&device
->dev
.kobj
, "sysdev");
626 sysfs_remove_link(&device
->dev
.kobj
, "thermal_cooling");
627 sysfs_remove_link(&pr
->cdev
->device
.kobj
, "device");
628 thermal_cooling_device_unregister(pr
->cdev
);
632 per_cpu(processors
, pr
->id
) = NULL
;
633 per_cpu(processor_device_array
, pr
->id
) = NULL
;
636 free_cpumask_var(pr
->throttling
.shared_cpu_map
);
642 #ifdef CONFIG_ACPI_HOTPLUG_CPU
643 /****************************************************************************
644 * Acpi processor hotplug support *
645 ****************************************************************************/
647 static int is_processor_present(acpi_handle handle
)
650 unsigned long long sta
= 0;
653 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
655 if (ACPI_SUCCESS(status
) && (sta
& ACPI_STA_DEVICE_PRESENT
))
659 * _STA is mandatory for a processor that supports hot plug
661 if (status
== AE_NOT_FOUND
)
662 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
663 "Processor does not support hot plug\n"));
665 ACPI_EXCEPTION((AE_INFO
, status
,
666 "Processor Device is not present"));
671 int acpi_processor_device_add(acpi_handle handle
, struct acpi_device
**device
)
674 struct acpi_device
*pdev
;
677 if (acpi_get_parent(handle
, &phandle
)) {
681 if (acpi_bus_get_device(phandle
, &pdev
)) {
685 if (acpi_bus_add(device
, pdev
, handle
, ACPI_BUS_TYPE_PROCESSOR
)) {
692 static void acpi_processor_hotplug_notify(acpi_handle handle
,
693 u32 event
, void *data
)
695 struct acpi_processor
*pr
;
696 struct acpi_device
*device
= NULL
;
701 case ACPI_NOTIFY_BUS_CHECK
:
702 case ACPI_NOTIFY_DEVICE_CHECK
:
703 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
704 "Processor driver received %s event\n",
705 (event
== ACPI_NOTIFY_BUS_CHECK
) ?
706 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
708 if (!is_processor_present(handle
))
711 if (acpi_bus_get_device(handle
, &device
)) {
712 result
= acpi_processor_device_add(handle
, &device
);
714 printk(KERN_ERR PREFIX
715 "Unable to add the device\n");
719 case ACPI_NOTIFY_EJECT_REQUEST
:
720 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
721 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
723 if (acpi_bus_get_device(handle
, &device
)) {
724 printk(KERN_ERR PREFIX
725 "Device don't exist, dropping EJECT\n");
728 pr
= acpi_driver_data(device
);
730 printk(KERN_ERR PREFIX
731 "Driver data is NULL, dropping EJECT\n");
736 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
737 "Unsupported event [0x%x]\n", event
));
745 processor_walk_namespace_cb(acpi_handle handle
,
746 u32 lvl
, void *context
, void **rv
)
749 int *action
= context
;
750 acpi_object_type type
= 0;
752 status
= acpi_get_type(handle
, &type
);
753 if (ACPI_FAILURE(status
))
756 if (type
!= ACPI_TYPE_PROCESSOR
)
760 case INSTALL_NOTIFY_HANDLER
:
761 acpi_install_notify_handler(handle
,
763 acpi_processor_hotplug_notify
,
766 case UNINSTALL_NOTIFY_HANDLER
:
767 acpi_remove_notify_handler(handle
,
769 acpi_processor_hotplug_notify
);
778 static acpi_status
acpi_processor_hotadd_init(struct acpi_processor
*pr
)
780 acpi_handle handle
= pr
->handle
;
782 if (!is_processor_present(handle
)) {
786 if (acpi_map_lsapic(handle
, &pr
->id
))
789 if (arch_register_cpu(pr
->id
)) {
790 acpi_unmap_lsapic(pr
->id
);
794 /* CPU got hot-plugged, but cpu_data is not initialized yet
795 * Set flag to delay cpu_idle/throttling initialization
797 * acpi_processor_add()
798 * acpi_processor_get_info()
799 * and do it when the CPU gets online the first time
800 * TBD: Cleanup above functions and try to do this more elegant.
802 printk(KERN_INFO
"CPU %d got hotplugged\n", pr
->id
);
803 pr
->flags
.need_hotplug_init
= 1;
808 static int acpi_processor_handle_eject(struct acpi_processor
*pr
)
810 if (cpu_online(pr
->id
))
813 arch_unregister_cpu(pr
->id
);
814 acpi_unmap_lsapic(pr
->id
);
818 static acpi_status
acpi_processor_hotadd_init(struct acpi_processor
*pr
)
822 static int acpi_processor_handle_eject(struct acpi_processor
*pr
)
829 void acpi_processor_install_hotplug_notify(void)
831 #ifdef CONFIG_ACPI_HOTPLUG_CPU
832 int action
= INSTALL_NOTIFY_HANDLER
;
833 acpi_walk_namespace(ACPI_TYPE_PROCESSOR
,
836 processor_walk_namespace_cb
, NULL
, &action
, NULL
);
838 register_hotcpu_notifier(&acpi_cpu_notifier
);
842 void acpi_processor_uninstall_hotplug_notify(void)
844 #ifdef CONFIG_ACPI_HOTPLUG_CPU
845 int action
= UNINSTALL_NOTIFY_HANDLER
;
846 acpi_walk_namespace(ACPI_TYPE_PROCESSOR
,
849 processor_walk_namespace_cb
, NULL
, &action
, NULL
);
851 unregister_hotcpu_notifier(&acpi_cpu_notifier
);
855 * We keep the driver loaded even when ACPI is not running.
856 * This is needed for the powernow-k8 driver, that works even without
857 * ACPI, but needs symbols from this driver
860 static int __init
acpi_processor_init(void)
867 memset(&errata
, 0, sizeof(errata
));
869 result
= acpi_bus_register_driver(&acpi_processor_driver
);
873 acpi_processor_install_hotplug_notify();
875 acpi_thermal_cpufreq_init();
877 acpi_processor_ppc_init();
879 acpi_processor_throttling_init();
884 static void __exit
acpi_processor_exit(void)
889 acpi_processor_ppc_exit();
891 acpi_thermal_cpufreq_exit();
893 acpi_processor_uninstall_hotplug_notify();
895 acpi_bus_unregister_driver(&acpi_processor_driver
);
900 module_init(acpi_processor_init
);
901 module_exit(acpi_processor_exit
);
903 MODULE_ALIAS("processor");