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 EXPORT_PER_CPU_SYMBOL(processors);
128 struct acpi_processor_errata errata __read_mostly;
130 /* --------------------------------------------------------------------------
132 -------------------------------------------------------------------------- */
134 static int acpi_processor_errata_piix4(struct pci_dev *dev)
144 * Note that 'dev' references the PIIX4 ACPI Controller.
147 switch (dev->revision) {
149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
152 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
155 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
158 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
161 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
165 switch (dev->revision) {
167 case 0: /* PIIX4 A-step */
168 case 1: /* PIIX4 B-step */
170 * See specification changes #13 ("Manual Throttle Duty Cycle")
171 * and #14 ("Enabling and Disabling Manual Throttle"), plus
172 * erratum #5 ("STPCLK# Deassertion Time") from the January
173 * 2002 PIIX4 specification update. Applies to only older
176 errata.piix4.throttle = 1;
181 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
182 * Livelock") from the January 2002 PIIX4 specification update.
183 * Applies to all PIIX4 models.
189 * Find the PIIX4 IDE Controller and get the Bus Master IDE
190 * Status register address. We'll use this later to read
191 * each IDE controller's DMA status to make sure we catch all
194 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
195 PCI_DEVICE_ID_INTEL_82371AB,
196 PCI_ANY_ID, PCI_ANY_ID, NULL);
198 errata.piix4.bmisx = pci_resource_start(dev, 4);
205 * Find the PIIX4 ISA Controller and read the Motherboard
206 * DMA controller's status to see if Type-F (Fast) DMA mode
207 * is enabled (bit 7) on either channel. Note that we'll
208 * disable C3 support if this is enabled, as some legacy
209 * devices won't operate well if fast DMA is disabled.
211 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
212 PCI_DEVICE_ID_INTEL_82371AB_0,
213 PCI_ANY_ID, PCI_ANY_ID, NULL);
215 pci_read_config_byte(dev, 0x76, &value1);
216 pci_read_config_byte(dev, 0x77, &value2);
217 if ((value1 & 0x80) || (value2 & 0x80))
218 errata.piix4.fdma = 1;
225 if (errata.piix4.bmisx)
226 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
227 "Bus master activity detection (BM-IDE) erratum enabled\n"));
228 if (errata.piix4.fdma)
229 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
230 "Type-F DMA livelock erratum (C3 disabled)\n"));
235 static int acpi_processor_errata(struct acpi_processor *pr)
238 struct pci_dev *dev = NULL;
247 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
248 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
251 result = acpi_processor_errata_piix4(dev);
258 /* --------------------------------------------------------------------------
260 -------------------------------------------------------------------------- */
262 #ifdef CONFIG_ACPI_PROCFS
263 static struct proc_dir_entry *acpi_processor_dir = NULL;
265 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
267 struct acpi_processor *pr = seq->private;
273 seq_printf(seq, "processor id: %d\n"
275 "bus mastering control: %s\n"
276 "power management: %s\n"
277 "throttling control: %s\n"
278 "limit interface: %s\n",
281 pr->flags.bm_control ? "yes" : "no",
282 pr->flags.power ? "yes" : "no",
283 pr->flags.throttling ? "yes" : "no",
284 pr->flags.limit ? "yes" : "no");
290 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
292 return single_open(file, acpi_processor_info_seq_show,
296 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
298 struct proc_dir_entry *entry = NULL;
301 if (!acpi_device_dir(device)) {
302 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
304 if (!acpi_device_dir(device))
309 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
310 S_IRUGO, acpi_device_dir(device),
311 &acpi_processor_info_fops,
312 acpi_driver_data(device));
316 /* 'throttling' [R/W] */
317 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
318 S_IFREG | S_IRUGO | S_IWUSR,
319 acpi_device_dir(device),
320 &acpi_processor_throttling_fops,
321 acpi_driver_data(device));
326 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
327 S_IFREG | S_IRUGO | S_IWUSR,
328 acpi_device_dir(device),
329 &acpi_processor_limit_fops,
330 acpi_driver_data(device));
335 static int acpi_processor_remove_fs(struct acpi_device *device)
338 if (acpi_device_dir(device)) {
339 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
340 acpi_device_dir(device));
341 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
342 acpi_device_dir(device));
343 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
344 acpi_device_dir(device));
345 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
346 acpi_device_dir(device) = NULL;
352 static inline int acpi_processor_add_fs(struct acpi_device *device)
356 static inline int acpi_processor_remove_fs(struct acpi_device *device)
362 /* Use the acpiid in MADT to map cpus in case of SMP */
365 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
368 static struct acpi_table_madt *madt;
370 static int map_lapic_id(struct acpi_subtable_header *entry,
371 u32 acpi_id, int *apic_id)
373 struct acpi_madt_local_apic *lapic =
374 (struct acpi_madt_local_apic *)entry;
375 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
376 lapic->processor_id == acpi_id) {
377 *apic_id = lapic->id;
383 static int map_x2apic_id(struct acpi_subtable_header *entry,
384 int device_declaration, u32 acpi_id, int *apic_id)
386 struct acpi_madt_local_x2apic *apic =
387 (struct acpi_madt_local_x2apic *)entry;
388 u32 tmp = apic->local_apic_id;
390 /* Only check enabled APICs*/
391 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
394 /* Device statement declaration type */
395 if (device_declaration) {
396 if (apic->uid == acpi_id)
406 static int map_lsapic_id(struct acpi_subtable_header *entry,
407 int device_declaration, u32 acpi_id, int *apic_id)
409 struct acpi_madt_local_sapic *lsapic =
410 (struct acpi_madt_local_sapic *)entry;
411 u32 tmp = (lsapic->id << 8) | lsapic->eid;
413 /* Only check enabled APICs*/
414 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
417 /* Device statement declaration type */
418 if (device_declaration) {
419 if (entry->length < 16)
420 printk(KERN_ERR PREFIX
421 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
423 else if (lsapic->uid == acpi_id)
425 /* Processor statement declaration type */
426 } else if (lsapic->processor_id == acpi_id)
435 static int map_madt_entry(int type, u32 acpi_id)
437 unsigned long madt_end, entry;
443 entry = (unsigned long)madt;
444 madt_end = entry + madt->header.length;
446 /* Parse all entries looking for a match. */
448 entry += sizeof(struct acpi_table_madt);
449 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
450 struct acpi_subtable_header *header =
451 (struct acpi_subtable_header *)entry;
452 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
453 if (map_lapic_id(header, acpi_id, &apic_id))
455 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
456 if (map_x2apic_id(header, type, acpi_id, &apic_id))
458 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
459 if (map_lsapic_id(header, type, acpi_id, &apic_id))
462 entry += header->length;
467 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
469 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
470 union acpi_object *obj;
471 struct acpi_subtable_header *header;
474 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
477 if (!buffer.length || !buffer.pointer)
480 obj = buffer.pointer;
481 if (obj->type != ACPI_TYPE_BUFFER ||
482 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
486 header = (struct acpi_subtable_header *)obj->buffer.pointer;
487 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
488 map_lapic_id(header, acpi_id, &apic_id);
489 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
490 map_lsapic_id(header, type, acpi_id, &apic_id);
495 kfree(buffer.pointer);
499 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
504 apic_id = map_mat_entry(handle, type, acpi_id);
506 apic_id = map_madt_entry(type, acpi_id);
510 for_each_possible_cpu(i) {
511 if (cpu_physical_id(i) == apic_id)
518 /* --------------------------------------------------------------------------
520 -------------------------------------------------------------------------- */
522 static int acpi_processor_get_info(struct acpi_device *device)
524 acpi_status status = 0;
525 union acpi_object object = { 0 };
526 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
527 struct acpi_processor *pr;
528 int cpu_index, device_declaration = 0;
529 static int cpu0_initialized;
531 pr = acpi_driver_data(device);
535 if (num_online_cpus() > 1)
538 acpi_processor_errata(pr);
541 * Check to see if we have bus mastering arbitration control. This
542 * is required for proper C3 usage (to maintain cache coherency).
544 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
545 pr->flags.bm_control = 1;
546 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
547 "Bus mastering arbitration control present\n"));
549 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
550 "No bus mastering arbitration control\n"));
552 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
553 /* Declared with "Processor" statement; match ProcessorID */
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
565 pr->acpi_id = object.processor.proc_id;
568 * Declared with "Device" statement; match _UID.
569 * Note that we don't handle string _UIDs yet.
571 unsigned long long value;
572 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
574 if (ACPI_FAILURE(status)) {
575 printk(KERN_ERR PREFIX
576 "Evaluating processor _UID [%#x]\n", status);
579 device_declaration = 1;
582 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
584 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
585 if (!cpu0_initialized && (cpu_index == -1) &&
586 (num_online_cpus() == 1)) {
590 cpu0_initialized = 1;
595 * Extra Processor objects may be enumerated on MP systems with
596 * less than the max # of CPUs. They should be ignored _iff
597 * they are physically not present.
601 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
606 * On some boxes several processors use the same processor bus id.
607 * But they are located in different scope. For example:
610 * Rename the processor device bus id. And the new bus id will be
611 * generated as the following format:
614 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
615 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
618 if (!object.processor.pblk_address)
619 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
620 else if (object.processor.pblk_length != 6)
621 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
622 object.processor.pblk_length);
624 pr->throttling.address = object.processor.pblk_address;
625 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
626 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
628 pr->pblk = object.processor.pblk_address;
631 * We don't care about error returns - we just try to mark
632 * these reserved so that nobody else is confused into thinking
633 * that this region might be unused..
635 * (In particular, allocating the IO range for Cardbus)
637 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
641 * If ACPI describes a slot number for this CPU, we can use it
642 * ensure we get the right value in the "physical id" field
645 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
646 if (ACPI_SUCCESS(status))
647 arch_fix_phys_package_id(pr->id, object.integer.value);
652 static DEFINE_PER_CPU(void *, processor_device_array);
654 static void acpi_processor_notify(struct acpi_device *device, u32 event)
656 struct acpi_processor *pr = acpi_driver_data(device);
663 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
664 saved = pr->performance_platform_limit;
665 acpi_processor_ppc_has_changed(pr, 1);
666 if (saved == pr->performance_platform_limit)
668 acpi_bus_generate_proc_event(device, event,
669 pr->performance_platform_limit);
670 acpi_bus_generate_netlink_event(device->pnp.device_class,
671 dev_name(&device->dev), event,
672 pr->performance_platform_limit);
674 case ACPI_PROCESSOR_NOTIFY_POWER:
675 acpi_processor_cst_has_changed(pr);
676 acpi_bus_generate_proc_event(device, event, 0);
677 acpi_bus_generate_netlink_event(device->pnp.device_class,
678 dev_name(&device->dev), event, 0);
680 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
681 acpi_processor_tstate_has_changed(pr);
682 acpi_bus_generate_proc_event(device, event, 0);
683 acpi_bus_generate_netlink_event(device->pnp.device_class,
684 dev_name(&device->dev), event, 0);
686 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
687 "Unsupported event [0x%x]\n", event));
694 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
695 unsigned long action, void *hcpu)
697 unsigned int cpu = (unsigned long)hcpu;
698 struct acpi_processor *pr = per_cpu(processors, cpu);
700 if (action == CPU_ONLINE && pr) {
701 acpi_processor_ppc_has_changed(pr, 0);
702 acpi_processor_cst_has_changed(pr);
703 acpi_processor_tstate_has_changed(pr);
708 static struct notifier_block acpi_cpu_notifier =
710 .notifier_call = acpi_cpu_soft_notify,
713 static int __cpuinit acpi_processor_add(struct acpi_device *device)
715 struct acpi_processor *pr = NULL;
717 struct sys_device *sysdev;
719 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
723 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
728 pr->handle = device->handle;
729 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
730 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
731 device->driver_data = pr;
733 result = acpi_processor_get_info(device);
735 /* Processor is physically not present */
739 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
743 * ACPI id of processors can be reported wrongly by the BIOS.
744 * Don't trust it blindly
746 if (per_cpu(processor_device_array, pr->id) != NULL &&
747 per_cpu(processor_device_array, pr->id) != device) {
748 printk(KERN_WARNING "BIOS reported wrong ACPI id "
749 "for the processor\n");
751 goto err_free_cpumask;
753 per_cpu(processor_device_array, pr->id) = device;
755 per_cpu(processors, pr->id) = pr;
757 result = acpi_processor_add_fs(device);
759 goto err_free_cpumask;
761 sysdev = get_cpu_sysdev(pr->id);
762 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
767 /* _PDC call should be done before doing anything else (if reqd.). */
768 acpi_processor_set_pdc(pr->handle);
770 #ifdef CONFIG_CPU_FREQ
771 acpi_processor_ppc_has_changed(pr, 0);
773 acpi_processor_get_throttling_info(pr);
774 acpi_processor_get_limit_info(pr);
777 acpi_processor_power_init(pr, device);
779 pr->cdev = thermal_cooling_device_register("Processor", device,
780 &processor_cooling_ops);
781 if (IS_ERR(pr->cdev)) {
782 result = PTR_ERR(pr->cdev);
786 dev_dbg(&device->dev, "registered as cooling_device%d\n",
789 result = sysfs_create_link(&device->dev.kobj,
790 &pr->cdev->device.kobj,
793 printk(KERN_ERR PREFIX "Create sysfs link\n");
794 goto err_thermal_unregister;
796 result = sysfs_create_link(&pr->cdev->device.kobj,
800 printk(KERN_ERR PREFIX "Create sysfs link\n");
801 goto err_remove_sysfs;
807 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
808 err_thermal_unregister:
809 thermal_cooling_device_unregister(pr->cdev);
811 acpi_processor_power_exit(pr, device);
813 acpi_processor_remove_fs(device);
815 free_cpumask_var(pr->throttling.shared_cpu_map);
820 static int acpi_processor_remove(struct acpi_device *device, int type)
822 struct acpi_processor *pr = NULL;
825 if (!device || !acpi_driver_data(device))
828 pr = acpi_driver_data(device);
830 if (pr->id >= nr_cpu_ids)
833 if (type == ACPI_BUS_REMOVAL_EJECT) {
834 if (acpi_processor_handle_eject(pr))
838 acpi_processor_power_exit(pr, device);
840 sysfs_remove_link(&device->dev.kobj, "sysdev");
842 acpi_processor_remove_fs(device);
845 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
846 sysfs_remove_link(&pr->cdev->device.kobj, "device");
847 thermal_cooling_device_unregister(pr->cdev);
851 per_cpu(processors, pr->id) = NULL;
852 per_cpu(processor_device_array, pr->id) = NULL;
855 free_cpumask_var(pr->throttling.shared_cpu_map);
861 #ifdef CONFIG_ACPI_HOTPLUG_CPU
862 /****************************************************************************
863 * Acpi processor hotplug support *
864 ****************************************************************************/
866 static int is_processor_present(acpi_handle handle)
869 unsigned long long sta = 0;
872 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
874 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
878 * _STA is mandatory for a processor that supports hot plug
880 if (status == AE_NOT_FOUND)
881 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
882 "Processor does not support hot plug\n"));
884 ACPI_EXCEPTION((AE_INFO, status,
885 "Processor Device is not present"));
890 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
893 struct acpi_device *pdev;
896 if (acpi_get_parent(handle, &phandle)) {
900 if (acpi_bus_get_device(phandle, &pdev)) {
904 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
911 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
912 u32 event, void *data)
914 struct acpi_processor *pr;
915 struct acpi_device *device = NULL;
920 case ACPI_NOTIFY_BUS_CHECK:
921 case ACPI_NOTIFY_DEVICE_CHECK:
922 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
923 "Processor driver received %s event\n",
924 (event == ACPI_NOTIFY_BUS_CHECK) ?
925 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
927 if (!is_processor_present(handle))
930 if (acpi_bus_get_device(handle, &device)) {
931 result = acpi_processor_device_add(handle, &device);
933 printk(KERN_ERR PREFIX
934 "Unable to add the device\n");
938 case ACPI_NOTIFY_EJECT_REQUEST:
939 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
940 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
942 if (acpi_bus_get_device(handle, &device)) {
943 printk(KERN_ERR PREFIX
944 "Device don't exist, dropping EJECT\n");
947 pr = acpi_driver_data(device);
949 printk(KERN_ERR PREFIX
950 "Driver data is NULL, dropping EJECT\n");
955 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
956 "Unsupported event [0x%x]\n", event));
964 processor_walk_namespace_cb(acpi_handle handle,
965 u32 lvl, void *context, void **rv)
968 int *action = context;
969 acpi_object_type type = 0;
971 status = acpi_get_type(handle, &type);
972 if (ACPI_FAILURE(status))
975 if (type != ACPI_TYPE_PROCESSOR)
979 case INSTALL_NOTIFY_HANDLER:
980 acpi_install_notify_handler(handle,
982 acpi_processor_hotplug_notify,
985 case UNINSTALL_NOTIFY_HANDLER:
986 acpi_remove_notify_handler(handle,
988 acpi_processor_hotplug_notify);
997 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1000 if (!is_processor_present(handle)) {
1004 if (acpi_map_lsapic(handle, p_cpu))
1007 if (arch_register_cpu(*p_cpu)) {
1008 acpi_unmap_lsapic(*p_cpu);
1015 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1017 if (cpu_online(pr->id))
1020 arch_unregister_cpu(pr->id);
1021 acpi_unmap_lsapic(pr->id);
1025 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1029 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1036 void acpi_processor_install_hotplug_notify(void)
1038 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1039 int action = INSTALL_NOTIFY_HANDLER;
1040 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1043 processor_walk_namespace_cb, NULL, &action, NULL);
1045 register_hotcpu_notifier(&acpi_cpu_notifier);
1049 void acpi_processor_uninstall_hotplug_notify(void)
1051 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1052 int action = UNINSTALL_NOTIFY_HANDLER;
1053 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1056 processor_walk_namespace_cb, NULL, &action, NULL);
1058 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1062 * We keep the driver loaded even when ACPI is not running.
1063 * This is needed for the powernow-k8 driver, that works even without
1064 * ACPI, but needs symbols from this driver
1067 static int __init acpi_processor_init(void)
1074 memset(&errata, 0, sizeof(errata));
1077 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1078 (struct acpi_table_header **)&madt)))
1081 #ifdef CONFIG_ACPI_PROCFS
1082 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1083 if (!acpi_processor_dir)
1086 result = cpuidle_register_driver(&acpi_idle_driver);
1090 result = acpi_bus_register_driver(&acpi_processor_driver);
1094 acpi_processor_install_hotplug_notify();
1096 acpi_thermal_cpufreq_init();
1098 acpi_processor_ppc_init();
1100 acpi_processor_throttling_init();
1105 cpuidle_unregister_driver(&acpi_idle_driver);
1108 #ifdef CONFIG_ACPI_PROCFS
1109 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1115 static void __exit acpi_processor_exit(void)
1120 acpi_processor_ppc_exit();
1122 acpi_thermal_cpufreq_exit();
1124 acpi_processor_uninstall_hotplug_notify();
1126 acpi_bus_unregister_driver(&acpi_processor_driver);
1128 cpuidle_unregister_driver(&acpi_idle_driver);
1130 #ifdef CONFIG_ACPI_PROCFS
1131 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1137 module_init(acpi_processor_init);
1138 module_exit(acpi_processor_exit);
1140 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1142 MODULE_ALIAS("processor");