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>
47 #include <linux/cpuidle.h>
50 #include <asm/system.h>
52 #include <asm/delay.h>
53 #include <asm/uaccess.h>
54 #include <asm/processor.h>
58 #include <acpi/acpi_bus.h>
59 #include <acpi/acpi_drivers.h>
60 #include <acpi/processor.h>
62 #define PREFIX "ACPI: "
64 #define ACPI_PROCESSOR_CLASS "processor"
65 #define ACPI_PROCESSOR_DEVICE_NAME "Processor"
66 #define ACPI_PROCESSOR_FILE_INFO "info"
67 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
68 #define ACPI_PROCESSOR_FILE_LIMIT "limit"
69 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
70 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81
71 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
73 #define ACPI_PROCESSOR_LIMIT_USER 0
74 #define ACPI_PROCESSOR_LIMIT_THERMAL 1
76 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
77 ACPI_MODULE_NAME("processor_core");
79 MODULE_AUTHOR("Paul Diefenbaugh");
80 MODULE_DESCRIPTION("ACPI Processor Driver");
81 MODULE_LICENSE("GPL");
83 static int acpi_processor_add(struct acpi_device *device);
84 static int acpi_processor_remove(struct acpi_device *device, int type);
85 #ifdef CONFIG_ACPI_PROCFS
86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
88 static void acpi_processor_notify(struct acpi_device *device, u32 event);
89 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
90 static int acpi_processor_handle_eject(struct acpi_processor *pr);
93 static const struct acpi_device_id processor_device_ids[] = {
94 {ACPI_PROCESSOR_OBJECT_HID, 0},
98 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
100 static struct acpi_driver acpi_processor_driver = {
102 .class = ACPI_PROCESSOR_CLASS,
103 .ids = processor_device_ids,
105 .add = acpi_processor_add,
106 .remove = acpi_processor_remove,
107 .suspend = acpi_processor_suspend,
108 .resume = acpi_processor_resume,
109 .notify = acpi_processor_notify,
113 #define INSTALL_NOTIFY_HANDLER 1
114 #define UNINSTALL_NOTIFY_HANDLER 2
115 #ifdef CONFIG_ACPI_PROCFS
116 static const struct file_operations acpi_processor_info_fops = {
117 .owner = THIS_MODULE,
118 .open = acpi_processor_info_open_fs,
121 .release = single_release,
125 DEFINE_PER_CPU(struct acpi_processor *, processors);
126 struct acpi_processor_errata errata __read_mostly;
128 /* --------------------------------------------------------------------------
130 -------------------------------------------------------------------------- */
132 static int acpi_processor_errata_piix4(struct pci_dev *dev)
142 * Note that 'dev' references the PIIX4 ACPI Controller.
145 switch (dev->revision) {
147 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
150 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
153 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
156 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
159 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
163 switch (dev->revision) {
165 case 0: /* PIIX4 A-step */
166 case 1: /* PIIX4 B-step */
168 * See specification changes #13 ("Manual Throttle Duty Cycle")
169 * and #14 ("Enabling and Disabling Manual Throttle"), plus
170 * erratum #5 ("STPCLK# Deassertion Time") from the January
171 * 2002 PIIX4 specification update. Applies to only older
174 errata.piix4.throttle = 1;
179 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
180 * Livelock") from the January 2002 PIIX4 specification update.
181 * Applies to all PIIX4 models.
187 * Find the PIIX4 IDE Controller and get the Bus Master IDE
188 * Status register address. We'll use this later to read
189 * each IDE controller's DMA status to make sure we catch all
192 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
193 PCI_DEVICE_ID_INTEL_82371AB,
194 PCI_ANY_ID, PCI_ANY_ID, NULL);
196 errata.piix4.bmisx = pci_resource_start(dev, 4);
203 * Find the PIIX4 ISA Controller and read the Motherboard
204 * DMA controller's status to see if Type-F (Fast) DMA mode
205 * is enabled (bit 7) on either channel. Note that we'll
206 * disable C3 support if this is enabled, as some legacy
207 * devices won't operate well if fast DMA is disabled.
209 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
210 PCI_DEVICE_ID_INTEL_82371AB_0,
211 PCI_ANY_ID, PCI_ANY_ID, NULL);
213 pci_read_config_byte(dev, 0x76, &value1);
214 pci_read_config_byte(dev, 0x77, &value2);
215 if ((value1 & 0x80) || (value2 & 0x80))
216 errata.piix4.fdma = 1;
223 if (errata.piix4.bmisx)
224 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
225 "Bus master activity detection (BM-IDE) erratum enabled\n"));
226 if (errata.piix4.fdma)
227 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
228 "Type-F DMA livelock erratum (C3 disabled)\n"));
233 static int acpi_processor_errata(struct acpi_processor *pr)
236 struct pci_dev *dev = NULL;
245 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
246 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
249 result = acpi_processor_errata_piix4(dev);
256 /* --------------------------------------------------------------------------
258 -------------------------------------------------------------------------- */
260 #ifdef CONFIG_ACPI_PROCFS
261 static struct proc_dir_entry *acpi_processor_dir = NULL;
263 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
265 struct acpi_processor *pr = seq->private;
271 seq_printf(seq, "processor id: %d\n"
273 "bus mastering control: %s\n"
274 "power management: %s\n"
275 "throttling control: %s\n"
276 "limit interface: %s\n",
279 pr->flags.bm_control ? "yes" : "no",
280 pr->flags.power ? "yes" : "no",
281 pr->flags.throttling ? "yes" : "no",
282 pr->flags.limit ? "yes" : "no");
288 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
290 return single_open(file, acpi_processor_info_seq_show,
294 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
296 struct proc_dir_entry *entry = NULL;
299 if (!acpi_device_dir(device)) {
300 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
302 if (!acpi_device_dir(device))
307 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
308 S_IRUGO, acpi_device_dir(device),
309 &acpi_processor_info_fops,
310 acpi_driver_data(device));
314 /* 'throttling' [R/W] */
315 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
316 S_IFREG | S_IRUGO | S_IWUSR,
317 acpi_device_dir(device),
318 &acpi_processor_throttling_fops,
319 acpi_driver_data(device));
324 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
325 S_IFREG | S_IRUGO | S_IWUSR,
326 acpi_device_dir(device),
327 &acpi_processor_limit_fops,
328 acpi_driver_data(device));
333 static int acpi_processor_remove_fs(struct acpi_device *device)
336 if (acpi_device_dir(device)) {
337 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
338 acpi_device_dir(device));
339 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
340 acpi_device_dir(device));
341 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
342 acpi_device_dir(device));
343 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
344 acpi_device_dir(device) = NULL;
350 static inline int acpi_processor_add_fs(struct acpi_device *device)
354 static inline int acpi_processor_remove_fs(struct acpi_device *device)
360 /* Use the acpiid in MADT to map cpus in case of SMP */
363 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
366 static struct acpi_table_madt *madt;
368 static int map_lapic_id(struct acpi_subtable_header *entry,
369 u32 acpi_id, int *apic_id)
371 struct acpi_madt_local_apic *lapic =
372 (struct acpi_madt_local_apic *)entry;
373 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
374 lapic->processor_id == acpi_id) {
375 *apic_id = lapic->id;
381 static int map_x2apic_id(struct acpi_subtable_header *entry,
382 int device_declaration, u32 acpi_id, int *apic_id)
384 struct acpi_madt_local_x2apic *apic =
385 (struct acpi_madt_local_x2apic *)entry;
386 u32 tmp = apic->local_apic_id;
388 /* Only check enabled APICs*/
389 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
392 /* Device statement declaration type */
393 if (device_declaration) {
394 if (apic->uid == acpi_id)
404 static int map_lsapic_id(struct acpi_subtable_header *entry,
405 int device_declaration, u32 acpi_id, int *apic_id)
407 struct acpi_madt_local_sapic *lsapic =
408 (struct acpi_madt_local_sapic *)entry;
409 u32 tmp = (lsapic->id << 8) | lsapic->eid;
411 /* Only check enabled APICs*/
412 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
415 /* Device statement declaration type */
416 if (device_declaration) {
417 if (entry->length < 16)
418 printk(KERN_ERR PREFIX
419 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
421 else if (lsapic->uid == acpi_id)
423 /* Processor statement declaration type */
424 } else if (lsapic->processor_id == acpi_id)
433 static int map_madt_entry(int type, u32 acpi_id)
435 unsigned long madt_end, entry;
441 entry = (unsigned long)madt;
442 madt_end = entry + madt->header.length;
444 /* Parse all entries looking for a match. */
446 entry += sizeof(struct acpi_table_madt);
447 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
448 struct acpi_subtable_header *header =
449 (struct acpi_subtable_header *)entry;
450 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
451 if (map_lapic_id(header, acpi_id, &apic_id))
453 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
454 if (map_x2apic_id(header, type, acpi_id, &apic_id))
456 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
457 if (map_lsapic_id(header, type, acpi_id, &apic_id))
460 entry += header->length;
465 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
467 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
468 union acpi_object *obj;
469 struct acpi_subtable_header *header;
472 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
475 if (!buffer.length || !buffer.pointer)
478 obj = buffer.pointer;
479 if (obj->type != ACPI_TYPE_BUFFER ||
480 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
484 header = (struct acpi_subtable_header *)obj->buffer.pointer;
485 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
486 map_lapic_id(header, acpi_id, &apic_id);
487 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
488 map_lsapic_id(header, type, acpi_id, &apic_id);
493 kfree(buffer.pointer);
497 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
502 apic_id = map_mat_entry(handle, type, acpi_id);
504 apic_id = map_madt_entry(type, acpi_id);
508 for_each_possible_cpu(i) {
509 if (cpu_physical_id(i) == apic_id)
516 /* --------------------------------------------------------------------------
518 -------------------------------------------------------------------------- */
520 static int acpi_processor_get_info(struct acpi_device *device)
522 acpi_status status = 0;
523 union acpi_object object = { 0 };
524 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
525 struct acpi_processor *pr;
526 int cpu_index, device_declaration = 0;
527 static int cpu0_initialized;
529 pr = acpi_driver_data(device);
533 if (num_online_cpus() > 1)
536 acpi_processor_errata(pr);
539 * Check to see if we have bus mastering arbitration control. This
540 * is required for proper C3 usage (to maintain cache coherency).
542 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
543 pr->flags.bm_control = 1;
544 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
545 "Bus mastering arbitration control present\n"));
547 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
548 "No bus mastering arbitration control\n"));
550 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
551 /* Declared with "Processor" statement; match ProcessorID */
552 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
553 if (ACPI_FAILURE(status)) {
554 printk(KERN_ERR PREFIX "Evaluating processor object\n");
559 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
560 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
563 pr->acpi_id = object.processor.proc_id;
566 * Declared with "Device" statement; match _UID.
567 * Note that we don't handle string _UIDs yet.
569 unsigned long long value;
570 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
572 if (ACPI_FAILURE(status)) {
573 printk(KERN_ERR PREFIX
574 "Evaluating processor _UID [%#x]\n", status);
577 device_declaration = 1;
580 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
582 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
583 if (!cpu0_initialized && (cpu_index == -1) &&
584 (num_online_cpus() == 1)) {
588 cpu0_initialized = 1;
593 * Extra Processor objects may be enumerated on MP systems with
594 * less than the max # of CPUs. They should be ignored _iff
595 * they are physically not present.
599 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
604 * On some boxes several processors use the same processor bus id.
605 * But they are located in different scope. For example:
608 * Rename the processor device bus id. And the new bus id will be
609 * generated as the following format:
612 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
613 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
616 if (!object.processor.pblk_address)
617 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
618 else if (object.processor.pblk_length != 6)
619 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
620 object.processor.pblk_length);
622 pr->throttling.address = object.processor.pblk_address;
623 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
624 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
626 pr->pblk = object.processor.pblk_address;
629 * We don't care about error returns - we just try to mark
630 * these reserved so that nobody else is confused into thinking
631 * that this region might be unused..
633 * (In particular, allocating the IO range for Cardbus)
635 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
639 * If ACPI describes a slot number for this CPU, we can use it
640 * ensure we get the right value in the "physical id" field
643 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
644 if (ACPI_SUCCESS(status))
645 arch_fix_phys_package_id(pr->id, object.integer.value);
650 static DEFINE_PER_CPU(void *, processor_device_array);
652 static void acpi_processor_notify(struct acpi_device *device, u32 event)
654 struct acpi_processor *pr = acpi_driver_data(device);
661 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
662 saved = pr->performance_platform_limit;
663 acpi_processor_ppc_has_changed(pr, 1);
664 if (saved == pr->performance_platform_limit)
666 acpi_bus_generate_proc_event(device, event,
667 pr->performance_platform_limit);
668 acpi_bus_generate_netlink_event(device->pnp.device_class,
669 dev_name(&device->dev), event,
670 pr->performance_platform_limit);
672 case ACPI_PROCESSOR_NOTIFY_POWER:
673 acpi_processor_cst_has_changed(pr);
674 acpi_bus_generate_proc_event(device, event, 0);
675 acpi_bus_generate_netlink_event(device->pnp.device_class,
676 dev_name(&device->dev), event, 0);
678 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
679 acpi_processor_tstate_has_changed(pr);
680 acpi_bus_generate_proc_event(device, event, 0);
681 acpi_bus_generate_netlink_event(device->pnp.device_class,
682 dev_name(&device->dev), event, 0);
684 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
685 "Unsupported event [0x%x]\n", event));
692 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
693 unsigned long action, void *hcpu)
695 unsigned int cpu = (unsigned long)hcpu;
696 struct acpi_processor *pr = per_cpu(processors, cpu);
698 if (action == CPU_ONLINE && pr) {
699 acpi_processor_ppc_has_changed(pr, 0);
700 acpi_processor_cst_has_changed(pr);
701 acpi_processor_tstate_has_changed(pr);
706 static struct notifier_block acpi_cpu_notifier =
708 .notifier_call = acpi_cpu_soft_notify,
711 static int __cpuinit acpi_processor_add(struct acpi_device *device)
713 struct acpi_processor *pr = NULL;
715 struct sys_device *sysdev;
717 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
721 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, 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 device->driver_data = pr;
731 result = acpi_processor_get_info(device);
733 /* Processor is physically not present */
737 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
741 * ACPI id of processors can be reported wrongly by the BIOS.
742 * Don't trust it blindly
744 if (per_cpu(processor_device_array, pr->id) != NULL &&
745 per_cpu(processor_device_array, pr->id) != device) {
746 printk(KERN_WARNING "BIOS reported wrong ACPI id "
747 "for the processor\n");
749 goto err_free_cpumask;
751 per_cpu(processor_device_array, pr->id) = device;
753 per_cpu(processors, pr->id) = pr;
755 result = acpi_processor_add_fs(device);
757 goto err_free_cpumask;
759 sysdev = get_cpu_sysdev(pr->id);
760 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
765 /* _PDC call should be done before doing anything else (if reqd.). */
766 acpi_processor_set_pdc(pr->handle);
768 #ifdef CONFIG_CPU_FREQ
769 acpi_processor_ppc_has_changed(pr, 0);
771 acpi_processor_get_throttling_info(pr);
772 acpi_processor_get_limit_info(pr);
775 acpi_processor_power_init(pr, device);
777 pr->cdev = thermal_cooling_device_register("Processor", device,
778 &processor_cooling_ops);
779 if (IS_ERR(pr->cdev)) {
780 result = PTR_ERR(pr->cdev);
784 dev_dbg(&device->dev, "registered as cooling_device%d\n",
787 result = sysfs_create_link(&device->dev.kobj,
788 &pr->cdev->device.kobj,
791 printk(KERN_ERR PREFIX "Create sysfs link\n");
792 goto err_thermal_unregister;
794 result = sysfs_create_link(&pr->cdev->device.kobj,
798 printk(KERN_ERR PREFIX "Create sysfs link\n");
799 goto err_remove_sysfs;
805 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
806 err_thermal_unregister:
807 thermal_cooling_device_unregister(pr->cdev);
809 acpi_processor_power_exit(pr, device);
811 acpi_processor_remove_fs(device);
813 free_cpumask_var(pr->throttling.shared_cpu_map);
818 static int acpi_processor_remove(struct acpi_device *device, int type)
820 struct acpi_processor *pr = NULL;
823 if (!device || !acpi_driver_data(device))
826 pr = acpi_driver_data(device);
828 if (pr->id >= nr_cpu_ids)
831 if (type == ACPI_BUS_REMOVAL_EJECT) {
832 if (acpi_processor_handle_eject(pr))
836 acpi_processor_power_exit(pr, device);
838 sysfs_remove_link(&device->dev.kobj, "sysdev");
840 acpi_processor_remove_fs(device);
843 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
844 sysfs_remove_link(&pr->cdev->device.kobj, "device");
845 thermal_cooling_device_unregister(pr->cdev);
849 per_cpu(processors, pr->id) = NULL;
850 per_cpu(processor_device_array, pr->id) = NULL;
853 free_cpumask_var(pr->throttling.shared_cpu_map);
859 #ifdef CONFIG_ACPI_HOTPLUG_CPU
860 /****************************************************************************
861 * Acpi processor hotplug support *
862 ****************************************************************************/
864 static int is_processor_present(acpi_handle handle)
867 unsigned long long sta = 0;
870 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
872 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
876 * _STA is mandatory for a processor that supports hot plug
878 if (status == AE_NOT_FOUND)
879 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
880 "Processor does not support hot plug\n"));
882 ACPI_EXCEPTION((AE_INFO, status,
883 "Processor Device is not present"));
888 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
891 struct acpi_device *pdev;
894 if (acpi_get_parent(handle, &phandle)) {
898 if (acpi_bus_get_device(phandle, &pdev)) {
902 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
909 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
910 u32 event, void *data)
912 struct acpi_processor *pr;
913 struct acpi_device *device = NULL;
918 case ACPI_NOTIFY_BUS_CHECK:
919 case ACPI_NOTIFY_DEVICE_CHECK:
920 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
921 "Processor driver received %s event\n",
922 (event == ACPI_NOTIFY_BUS_CHECK) ?
923 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
925 if (!is_processor_present(handle))
928 if (acpi_bus_get_device(handle, &device)) {
929 result = acpi_processor_device_add(handle, &device);
931 printk(KERN_ERR PREFIX
932 "Unable to add the device\n");
936 case ACPI_NOTIFY_EJECT_REQUEST:
937 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
938 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
940 if (acpi_bus_get_device(handle, &device)) {
941 printk(KERN_ERR PREFIX
942 "Device don't exist, dropping EJECT\n");
945 pr = acpi_driver_data(device);
947 printk(KERN_ERR PREFIX
948 "Driver data is NULL, dropping EJECT\n");
953 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
954 "Unsupported event [0x%x]\n", event));
962 processor_walk_namespace_cb(acpi_handle handle,
963 u32 lvl, void *context, void **rv)
966 int *action = context;
967 acpi_object_type type = 0;
969 status = acpi_get_type(handle, &type);
970 if (ACPI_FAILURE(status))
973 if (type != ACPI_TYPE_PROCESSOR)
977 case INSTALL_NOTIFY_HANDLER:
978 acpi_install_notify_handler(handle,
980 acpi_processor_hotplug_notify,
983 case UNINSTALL_NOTIFY_HANDLER:
984 acpi_remove_notify_handler(handle,
986 acpi_processor_hotplug_notify);
995 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
998 if (!is_processor_present(handle)) {
1002 if (acpi_map_lsapic(handle, p_cpu))
1005 if (arch_register_cpu(*p_cpu)) {
1006 acpi_unmap_lsapic(*p_cpu);
1013 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1015 if (cpu_online(pr->id))
1018 arch_unregister_cpu(pr->id);
1019 acpi_unmap_lsapic(pr->id);
1023 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1027 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1034 void acpi_processor_install_hotplug_notify(void)
1036 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1037 int action = INSTALL_NOTIFY_HANDLER;
1038 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1041 processor_walk_namespace_cb, NULL, &action, NULL);
1043 register_hotcpu_notifier(&acpi_cpu_notifier);
1047 void acpi_processor_uninstall_hotplug_notify(void)
1049 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1050 int action = UNINSTALL_NOTIFY_HANDLER;
1051 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1054 processor_walk_namespace_cb, NULL, &action, NULL);
1056 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1060 * We keep the driver loaded even when ACPI is not running.
1061 * This is needed for the powernow-k8 driver, that works even without
1062 * ACPI, but needs symbols from this driver
1065 static int __init acpi_processor_init(void)
1072 memset(&errata, 0, sizeof(errata));
1075 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1076 (struct acpi_table_header **)&madt)))
1079 #ifdef CONFIG_ACPI_PROCFS
1080 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1081 if (!acpi_processor_dir)
1084 result = cpuidle_register_driver(&acpi_idle_driver);
1088 result = acpi_bus_register_driver(&acpi_processor_driver);
1092 acpi_processor_install_hotplug_notify();
1094 acpi_thermal_cpufreq_init();
1096 acpi_processor_ppc_init();
1098 acpi_processor_throttling_init();
1103 cpuidle_unregister_driver(&acpi_idle_driver);
1106 #ifdef CONFIG_ACPI_PROCFS
1107 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1113 static void __exit acpi_processor_exit(void)
1118 acpi_processor_ppc_exit();
1120 acpi_thermal_cpufreq_exit();
1122 acpi_processor_uninstall_hotplug_notify();
1124 acpi_bus_unregister_driver(&acpi_processor_driver);
1126 cpuidle_unregister_driver(&acpi_idle_driver);
1128 #ifdef CONFIG_ACPI_PROCFS
1129 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1135 module_init(acpi_processor_init);
1136 module_exit(acpi_processor_exit);
1138 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1140 MODULE_ALIAS("processor");