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("acpi_processor")
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 = {
92 .name = ACPI_PROCESSOR_DRIVER_NAME,
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 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)
125 ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4");
128 return_VALUE(-EINVAL);
131 * Note that 'dev' references the PIIX4 ACPI Controller.
134 pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
138 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
141 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
144 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
147 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
150 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
156 case 0: /* PIIX4 A-step */
157 case 1: /* PIIX4 B-step */
159 * See specification changes #13 ("Manual Throttle Duty Cycle")
160 * and #14 ("Enabling and Disabling Manual Throttle"), plus
161 * erratum #5 ("STPCLK# Deassertion Time") from the January
162 * 2002 PIIX4 specification update. Applies to only older
165 errata.piix4.throttle = 1;
170 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
171 * Livelock") from the January 2002 PIIX4 specification update.
172 * Applies to all PIIX4 models.
178 * Find the PIIX4 IDE Controller and get the Bus Master IDE
179 * Status register address. We'll use this later to read
180 * each IDE controller's DMA status to make sure we catch all
183 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
184 PCI_DEVICE_ID_INTEL_82371AB,
185 PCI_ANY_ID, PCI_ANY_ID, NULL);
187 errata.piix4.bmisx = pci_resource_start(dev, 4);
194 * Find the PIIX4 ISA Controller and read the Motherboard
195 * DMA controller's status to see if Type-F (Fast) DMA mode
196 * is enabled (bit 7) on either channel. Note that we'll
197 * disable C3 support if this is enabled, as some legacy
198 * devices won't operate well if fast DMA is disabled.
200 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
201 PCI_DEVICE_ID_INTEL_82371AB_0,
202 PCI_ANY_ID, PCI_ANY_ID, NULL);
204 pci_read_config_byte(dev, 0x76, &value1);
205 pci_read_config_byte(dev, 0x77, &value2);
206 if ((value1 & 0x80) || (value2 & 0x80))
207 errata.piix4.fdma = 1;
214 if (errata.piix4.bmisx)
215 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
216 "Bus master activity detection (BM-IDE) erratum enabled\n"));
217 if (errata.piix4.fdma)
218 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
219 "Type-F DMA livelock erratum (C3 disabled)\n"));
224 static int acpi_processor_errata(struct acpi_processor *pr)
227 struct pci_dev *dev = NULL;
229 ACPI_FUNCTION_TRACE("acpi_processor_errata");
232 return_VALUE(-EINVAL);
237 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
238 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
241 result = acpi_processor_errata_piix4(dev);
245 return_VALUE(result);
248 /* --------------------------------------------------------------------------
249 Common ACPI processor functions
250 -------------------------------------------------------------------------- */
253 * _PDC is required for a BIOS-OS handshake for most of the newer
254 * ACPI processor features.
256 static int acpi_processor_set_pdc(struct acpi_processor *pr)
258 struct acpi_object_list *pdc_in = pr->pdc;
259 acpi_status status = AE_OK;
261 ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
264 return_VALUE(status);
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"));
272 return_VALUE(status);
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 = (struct acpi_processor *)seq->private;
285 ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
290 seq_printf(seq, "processor id: %d\n"
292 "bus mastering control: %s\n"
293 "power management: %s\n"
294 "throttling control: %s\n"
295 "limit interface: %s\n",
298 pr->flags.bm_control ? "yes" : "no",
299 pr->flags.power ? "yes" : "no",
300 pr->flags.throttling ? "yes" : "no",
301 pr->flags.limit ? "yes" : "no");
307 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
309 return single_open(file, acpi_processor_info_seq_show,
313 static int acpi_processor_add_fs(struct acpi_device *device)
315 struct proc_dir_entry *entry = NULL;
317 ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
319 if (!acpi_device_dir(device)) {
320 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
322 if (!acpi_device_dir(device))
323 return_VALUE(-ENODEV);
325 acpi_device_dir(device)->owner = THIS_MODULE;
328 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
329 S_IRUGO, acpi_device_dir(device));
333 entry->proc_fops = &acpi_processor_info_fops;
334 entry->data = acpi_driver_data(device);
335 entry->owner = THIS_MODULE;
338 /* 'throttling' [R/W] */
339 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
340 S_IFREG | S_IRUGO | S_IWUSR,
341 acpi_device_dir(device));
345 entry->proc_fops = &acpi_processor_throttling_fops;
346 entry->data = acpi_driver_data(device);
347 entry->owner = THIS_MODULE;
351 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
352 S_IFREG | S_IRUGO | S_IWUSR,
353 acpi_device_dir(device));
357 entry->proc_fops = &acpi_processor_limit_fops;
358 entry->data = acpi_driver_data(device);
359 entry->owner = THIS_MODULE;
365 static int acpi_processor_remove_fs(struct acpi_device *device)
367 ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
369 if (acpi_device_dir(device)) {
370 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
371 acpi_device_dir(device));
372 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
373 acpi_device_dir(device));
374 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
375 acpi_device_dir(device));
376 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
377 acpi_device_dir(device) = NULL;
383 /* Use the acpiid in MADT to map cpus in case of SMP */
385 #define convert_acpiid_to_cpu(acpi_id) (-1)
389 #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid
390 #define arch_cpu_to_apicid ia64_cpu_to_sapicid
391 #define ARCH_BAD_APICID (0xffff)
393 #define arch_acpiid_to_apicid x86_acpiid_to_apicid
394 #define arch_cpu_to_apicid x86_cpu_to_apicid
395 #define ARCH_BAD_APICID (0xff)
398 static int convert_acpiid_to_cpu(u8 acpi_id)
403 apic_id = arch_acpiid_to_apicid[acpi_id];
404 if (apic_id == ARCH_BAD_APICID)
407 for (i = 0; i < NR_CPUS; i++) {
408 if (arch_cpu_to_apicid[i] == apic_id)
415 /* --------------------------------------------------------------------------
417 -------------------------------------------------------------------------- */
419 static int acpi_processor_get_info(struct acpi_processor *pr)
421 acpi_status status = 0;
422 union acpi_object object = { 0 };
423 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
425 static int cpu0_initialized;
427 ACPI_FUNCTION_TRACE("acpi_processor_get_info");
430 return_VALUE(-EINVAL);
432 if (num_online_cpus() > 1)
435 acpi_processor_errata(pr);
438 * Check to see if we have bus mastering arbitration control. This
439 * is required for proper C3 usage (to maintain cache coherency).
441 if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
442 pr->flags.bm_control = 1;
443 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
444 "Bus mastering arbitration control present\n"));
446 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
447 "No bus mastering arbitration control\n"));
450 * Evalute the processor object. Note that it is common on SMP to
451 * have the first (boot) processor with a valid PBLK address while
452 * all others have a NULL address.
454 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
455 if (ACPI_FAILURE(status)) {
456 ACPI_ERROR((AE_INFO, "Evaluating processor object"));
457 return_VALUE(-ENODEV);
461 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
462 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
464 pr->acpi_id = object.processor.proc_id;
466 cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
468 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
469 if (!cpu0_initialized && (cpu_index == -1) &&
470 (num_online_cpus() == 1)) {
474 cpu0_initialized = 1;
479 * Extra Processor objects may be enumerated on MP systems with
480 * less than the max # of CPUs. They should be ignored _iff
481 * they are physically not present.
483 if (cpu_index == -1) {
485 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
487 "Getting cpuindex for acpiid 0x%x",
489 return_VALUE(-ENODEV);
493 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
496 if (!object.processor.pblk_address)
497 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
498 else if (object.processor.pblk_length != 6)
499 ACPI_ERROR((AE_INFO, "Invalid PBLK length [%d]",
500 object.processor.pblk_length));
502 pr->throttling.address = object.processor.pblk_address;
503 pr->throttling.duty_offset = acpi_fadt.duty_offset;
504 pr->throttling.duty_width = acpi_fadt.duty_width;
506 pr->pblk = object.processor.pblk_address;
509 * We don't care about error returns - we just try to mark
510 * these reserved so that nobody else is confused into thinking
511 * that this region might be unused..
513 * (In particular, allocating the IO range for Cardbus)
515 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
518 #ifdef CONFIG_CPU_FREQ
519 acpi_processor_ppc_has_changed(pr);
521 acpi_processor_get_throttling_info(pr);
522 acpi_processor_get_limit_info(pr);
527 static void *processor_device_array[NR_CPUS];
529 static int acpi_processor_start(struct acpi_device *device)
532 acpi_status status = AE_OK;
533 struct acpi_processor *pr;
535 ACPI_FUNCTION_TRACE("acpi_processor_start");
537 pr = acpi_driver_data(device);
539 result = acpi_processor_get_info(pr);
541 /* Processor is physically not present */
545 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
549 * ACPI id of processors can be reported wrongly by the BIOS.
550 * Don't trust it blindly
552 if (processor_device_array[pr->id] != NULL &&
553 processor_device_array[pr->id] != (void *)device) {
554 printk(KERN_WARNING "BIOS reported wrong ACPI id"
555 "for the processor\n");
556 return_VALUE(-ENODEV);
558 processor_device_array[pr->id] = (void *)device;
560 processors[pr->id] = pr;
562 result = acpi_processor_add_fs(device);
566 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
567 acpi_processor_notify, pr);
569 /* _PDC call should be done before doing anything else (if reqd.). */
570 arch_acpi_processor_init_pdc(pr);
571 acpi_processor_set_pdc(pr);
573 acpi_processor_power_init(pr, device);
575 if (pr->flags.throttling) {
576 printk(KERN_INFO PREFIX "%s [%s] (supports",
577 acpi_device_name(device), acpi_device_bid(device));
578 printk(" %d throttling states", pr->throttling.state_count);
584 return_VALUE(result);
587 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
589 struct acpi_processor *pr = (struct acpi_processor *)data;
590 struct acpi_device *device = NULL;
592 ACPI_FUNCTION_TRACE("acpi_processor_notify");
597 if (acpi_bus_get_device(pr->handle, &device))
601 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
602 acpi_processor_ppc_has_changed(pr);
603 acpi_bus_generate_event(device, event,
604 pr->performance_platform_limit);
606 case ACPI_PROCESSOR_NOTIFY_POWER:
607 acpi_processor_cst_has_changed(pr);
608 acpi_bus_generate_event(device, event, 0);
611 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
612 "Unsupported event [0x%x]\n", event));
619 static int acpi_processor_add(struct acpi_device *device)
621 struct acpi_processor *pr = NULL;
623 ACPI_FUNCTION_TRACE("acpi_processor_add");
626 return_VALUE(-EINVAL);
628 pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
630 return_VALUE(-ENOMEM);
631 memset(pr, 0, sizeof(struct acpi_processor));
633 pr->handle = device->handle;
634 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
635 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
636 acpi_driver_data(device) = pr;
641 static int acpi_processor_remove(struct acpi_device *device, int type)
643 acpi_status status = AE_OK;
644 struct acpi_processor *pr = NULL;
646 ACPI_FUNCTION_TRACE("acpi_processor_remove");
648 if (!device || !acpi_driver_data(device))
649 return_VALUE(-EINVAL);
651 pr = (struct acpi_processor *)acpi_driver_data(device);
653 if (pr->id >= NR_CPUS) {
658 if (type == ACPI_BUS_REMOVAL_EJECT) {
659 if (acpi_processor_handle_eject(pr))
660 return_VALUE(-EINVAL);
663 acpi_processor_power_exit(pr, device);
665 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
666 acpi_processor_notify);
668 acpi_processor_remove_fs(device);
670 processors[pr->id] = NULL;
677 #ifdef CONFIG_ACPI_HOTPLUG_CPU
678 /****************************************************************************
679 * Acpi processor hotplug support *
680 ****************************************************************************/
682 static int is_processor_present(acpi_handle handle);
684 static int is_processor_present(acpi_handle handle)
687 unsigned long sta = 0;
689 ACPI_FUNCTION_TRACE("is_processor_present");
691 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
692 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
693 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
700 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
703 struct acpi_device *pdev;
704 struct acpi_processor *pr;
706 ACPI_FUNCTION_TRACE("acpi_processor_device_add");
708 if (acpi_get_parent(handle, &phandle)) {
709 return_VALUE(-ENODEV);
712 if (acpi_bus_get_device(phandle, &pdev)) {
713 return_VALUE(-ENODEV);
716 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
717 return_VALUE(-ENODEV);
720 acpi_bus_start(*device);
722 pr = acpi_driver_data(*device);
724 return_VALUE(-ENODEV);
726 if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
727 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
733 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
735 struct acpi_processor *pr;
736 struct acpi_device *device = NULL;
739 ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
742 case ACPI_NOTIFY_BUS_CHECK:
743 case ACPI_NOTIFY_DEVICE_CHECK:
744 printk("Processor driver received %s event\n",
745 (event == ACPI_NOTIFY_BUS_CHECK) ?
746 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
748 if (!is_processor_present(handle))
751 if (acpi_bus_get_device(handle, &device)) {
752 result = acpi_processor_device_add(handle, &device);
755 "Unable to add the device"));
759 pr = acpi_driver_data(device);
761 ACPI_ERROR((AE_INFO, "Driver data is NULL"));
765 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
766 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
770 result = acpi_processor_start(device);
771 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
772 kobject_uevent(&device->kobj, KOBJ_ONLINE);
774 ACPI_ERROR((AE_INFO, "Device [%s] failed to start",
775 acpi_device_bid(device)));
778 case ACPI_NOTIFY_EJECT_REQUEST:
779 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
780 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
782 if (acpi_bus_get_device(handle, &device)) {
784 "Device don't exist, dropping EJECT"));
787 pr = acpi_driver_data(device);
790 "Driver data is NULL, dropping EJECT"));
794 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
795 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
798 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
799 "Unsupported event [0x%x]\n", event));
807 processor_walk_namespace_cb(acpi_handle handle,
808 u32 lvl, void *context, void **rv)
811 int *action = context;
812 acpi_object_type type = 0;
814 status = acpi_get_type(handle, &type);
815 if (ACPI_FAILURE(status))
818 if (type != ACPI_TYPE_PROCESSOR)
822 case INSTALL_NOTIFY_HANDLER:
823 acpi_install_notify_handler(handle,
825 acpi_processor_hotplug_notify,
828 case UNINSTALL_NOTIFY_HANDLER:
829 acpi_remove_notify_handler(handle,
831 acpi_processor_hotplug_notify);
840 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
842 ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
844 if (!is_processor_present(handle)) {
845 return_VALUE(AE_ERROR);
848 if (acpi_map_lsapic(handle, p_cpu))
849 return_VALUE(AE_ERROR);
851 if (arch_register_cpu(*p_cpu)) {
852 acpi_unmap_lsapic(*p_cpu);
853 return_VALUE(AE_ERROR);
859 static int acpi_processor_handle_eject(struct acpi_processor *pr)
861 if (cpu_online(pr->id)) {
864 arch_unregister_cpu(pr->id);
865 acpi_unmap_lsapic(pr->id);
869 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
873 static int acpi_processor_handle_eject(struct acpi_processor *pr)
880 void acpi_processor_install_hotplug_notify(void)
882 #ifdef CONFIG_ACPI_HOTPLUG_CPU
883 int action = INSTALL_NOTIFY_HANDLER;
884 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
887 processor_walk_namespace_cb, &action, NULL);
892 void acpi_processor_uninstall_hotplug_notify(void)
894 #ifdef CONFIG_ACPI_HOTPLUG_CPU
895 int action = UNINSTALL_NOTIFY_HANDLER;
896 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
899 processor_walk_namespace_cb, &action, NULL);
904 * We keep the driver loaded even when ACPI is not running.
905 * This is needed for the powernow-k8 driver, that works even without
906 * ACPI, but needs symbols from this driver
909 static int __init acpi_processor_init(void)
913 ACPI_FUNCTION_TRACE("acpi_processor_init");
915 memset(&processors, 0, sizeof(processors));
916 memset(&errata, 0, sizeof(errata));
918 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
919 if (!acpi_processor_dir)
921 acpi_processor_dir->owner = THIS_MODULE;
923 result = acpi_bus_register_driver(&acpi_processor_driver);
925 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
929 acpi_processor_install_hotplug_notify();
931 acpi_thermal_cpufreq_init();
933 acpi_processor_ppc_init();
938 static void __exit acpi_processor_exit(void)
940 ACPI_FUNCTION_TRACE("acpi_processor_exit");
942 acpi_processor_ppc_exit();
944 acpi_thermal_cpufreq_exit();
946 acpi_processor_uninstall_hotplug_notify();
948 acpi_bus_unregister_driver(&acpi_processor_driver);
950 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
955 module_init(acpi_processor_init);
956 module_exit(acpi_processor_exit);
958 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
960 MODULE_ALIAS("processor");