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;
129 static int set_no_mwait(const struct dmi_system_id *id)
131 printk(KERN_NOTICE PREFIX "%s detected - "
132 "disabling mwait for CPU C-states\n", id->ident);
137 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
139 set_no_mwait, "IFL91 board", {
140 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
141 DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
142 DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
143 DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
145 set_no_mwait, "Extensa 5220", {
146 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
147 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
148 DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
149 DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
153 /* --------------------------------------------------------------------------
155 -------------------------------------------------------------------------- */
157 static int acpi_processor_errata_piix4(struct pci_dev *dev)
167 * Note that 'dev' references the PIIX4 ACPI Controller.
170 switch (dev->revision) {
172 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
175 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
178 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
181 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
184 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
188 switch (dev->revision) {
190 case 0: /* PIIX4 A-step */
191 case 1: /* PIIX4 B-step */
193 * See specification changes #13 ("Manual Throttle Duty Cycle")
194 * and #14 ("Enabling and Disabling Manual Throttle"), plus
195 * erratum #5 ("STPCLK# Deassertion Time") from the January
196 * 2002 PIIX4 specification update. Applies to only older
199 errata.piix4.throttle = 1;
204 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
205 * Livelock") from the January 2002 PIIX4 specification update.
206 * Applies to all PIIX4 models.
212 * Find the PIIX4 IDE Controller and get the Bus Master IDE
213 * Status register address. We'll use this later to read
214 * each IDE controller's DMA status to make sure we catch all
217 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
218 PCI_DEVICE_ID_INTEL_82371AB,
219 PCI_ANY_ID, PCI_ANY_ID, NULL);
221 errata.piix4.bmisx = pci_resource_start(dev, 4);
228 * Find the PIIX4 ISA Controller and read the Motherboard
229 * DMA controller's status to see if Type-F (Fast) DMA mode
230 * is enabled (bit 7) on either channel. Note that we'll
231 * disable C3 support if this is enabled, as some legacy
232 * devices won't operate well if fast DMA is disabled.
234 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
235 PCI_DEVICE_ID_INTEL_82371AB_0,
236 PCI_ANY_ID, PCI_ANY_ID, NULL);
238 pci_read_config_byte(dev, 0x76, &value1);
239 pci_read_config_byte(dev, 0x77, &value2);
240 if ((value1 & 0x80) || (value2 & 0x80))
241 errata.piix4.fdma = 1;
248 if (errata.piix4.bmisx)
249 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
250 "Bus master activity detection (BM-IDE) erratum enabled\n"));
251 if (errata.piix4.fdma)
252 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
253 "Type-F DMA livelock erratum (C3 disabled)\n"));
258 static int acpi_processor_errata(struct acpi_processor *pr)
261 struct pci_dev *dev = NULL;
270 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
271 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
274 result = acpi_processor_errata_piix4(dev);
281 /* --------------------------------------------------------------------------
282 Common ACPI processor functions
283 -------------------------------------------------------------------------- */
286 * _PDC is required for a BIOS-OS handshake for most of the newer
287 * ACPI processor features.
289 static int acpi_processor_set_pdc(struct acpi_processor *pr)
291 struct acpi_object_list *pdc_in = pr->pdc;
292 acpi_status status = AE_OK;
299 * If mwait is disabled for CPU C-states, the C2C3_FFH access
300 * mode will be disabled in the parameter of _PDC object.
301 * Of course C1_FFH access mode will also be disabled.
303 union acpi_object *obj;
306 obj = pdc_in->pointer;
307 buffer = (u32 *)(obj->buffer.pointer);
308 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
311 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
313 if (ACPI_FAILURE(status))
314 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
315 "Could not evaluate _PDC, using legacy perf. control...\n"));
320 /* --------------------------------------------------------------------------
322 -------------------------------------------------------------------------- */
324 #ifdef CONFIG_ACPI_PROCFS
325 static struct proc_dir_entry *acpi_processor_dir = NULL;
327 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
329 struct acpi_processor *pr = seq->private;
335 seq_printf(seq, "processor id: %d\n"
337 "bus mastering control: %s\n"
338 "power management: %s\n"
339 "throttling control: %s\n"
340 "limit interface: %s\n",
343 pr->flags.bm_control ? "yes" : "no",
344 pr->flags.power ? "yes" : "no",
345 pr->flags.throttling ? "yes" : "no",
346 pr->flags.limit ? "yes" : "no");
352 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
354 return single_open(file, acpi_processor_info_seq_show,
358 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
360 struct proc_dir_entry *entry = NULL;
363 if (!acpi_device_dir(device)) {
364 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
366 if (!acpi_device_dir(device))
371 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
372 S_IRUGO, acpi_device_dir(device),
373 &acpi_processor_info_fops,
374 acpi_driver_data(device));
378 /* 'throttling' [R/W] */
379 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
380 S_IFREG | S_IRUGO | S_IWUSR,
381 acpi_device_dir(device),
382 &acpi_processor_throttling_fops,
383 acpi_driver_data(device));
388 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
389 S_IFREG | S_IRUGO | S_IWUSR,
390 acpi_device_dir(device),
391 &acpi_processor_limit_fops,
392 acpi_driver_data(device));
397 static int acpi_processor_remove_fs(struct acpi_device *device)
400 if (acpi_device_dir(device)) {
401 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
402 acpi_device_dir(device));
403 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
404 acpi_device_dir(device));
405 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
406 acpi_device_dir(device));
407 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
408 acpi_device_dir(device) = NULL;
414 static inline int acpi_processor_add_fs(struct acpi_device *device)
418 static inline int acpi_processor_remove_fs(struct acpi_device *device)
424 /* Use the acpiid in MADT to map cpus in case of SMP */
427 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
430 static struct acpi_table_madt *madt;
432 static int map_lapic_id(struct acpi_subtable_header *entry,
433 u32 acpi_id, int *apic_id)
435 struct acpi_madt_local_apic *lapic =
436 (struct acpi_madt_local_apic *)entry;
437 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
438 lapic->processor_id == acpi_id) {
439 *apic_id = lapic->id;
445 static int map_x2apic_id(struct acpi_subtable_header *entry,
446 int device_declaration, u32 acpi_id, int *apic_id)
448 struct acpi_madt_local_x2apic *apic =
449 (struct acpi_madt_local_x2apic *)entry;
450 u32 tmp = apic->local_apic_id;
452 /* Only check enabled APICs*/
453 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
456 /* Device statement declaration type */
457 if (device_declaration) {
458 if (apic->uid == acpi_id)
468 static int map_lsapic_id(struct acpi_subtable_header *entry,
469 int device_declaration, u32 acpi_id, int *apic_id)
471 struct acpi_madt_local_sapic *lsapic =
472 (struct acpi_madt_local_sapic *)entry;
473 u32 tmp = (lsapic->id << 8) | lsapic->eid;
475 /* Only check enabled APICs*/
476 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
479 /* Device statement declaration type */
480 if (device_declaration) {
481 if (entry->length < 16)
482 printk(KERN_ERR PREFIX
483 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
485 else if (lsapic->uid == acpi_id)
487 /* Processor statement declaration type */
488 } else if (lsapic->processor_id == acpi_id)
497 static int map_madt_entry(int type, u32 acpi_id)
499 unsigned long madt_end, entry;
505 entry = (unsigned long)madt;
506 madt_end = entry + madt->header.length;
508 /* Parse all entries looking for a match. */
510 entry += sizeof(struct acpi_table_madt);
511 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
512 struct acpi_subtable_header *header =
513 (struct acpi_subtable_header *)entry;
514 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
515 if (map_lapic_id(header, acpi_id, &apic_id))
517 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
518 if (map_x2apic_id(header, type, acpi_id, &apic_id))
520 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
521 if (map_lsapic_id(header, type, acpi_id, &apic_id))
524 entry += header->length;
529 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
531 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
532 union acpi_object *obj;
533 struct acpi_subtable_header *header;
536 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
539 if (!buffer.length || !buffer.pointer)
542 obj = buffer.pointer;
543 if (obj->type != ACPI_TYPE_BUFFER ||
544 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
548 header = (struct acpi_subtable_header *)obj->buffer.pointer;
549 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
550 map_lapic_id(header, acpi_id, &apic_id);
551 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
552 map_lsapic_id(header, type, acpi_id, &apic_id);
557 kfree(buffer.pointer);
561 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
566 apic_id = map_mat_entry(handle, type, acpi_id);
568 apic_id = map_madt_entry(type, acpi_id);
572 for_each_possible_cpu(i) {
573 if (cpu_physical_id(i) == apic_id)
580 /* --------------------------------------------------------------------------
582 -------------------------------------------------------------------------- */
584 static int acpi_processor_get_info(struct acpi_device *device)
586 acpi_status status = 0;
587 union acpi_object object = { 0 };
588 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
589 struct acpi_processor *pr;
590 int cpu_index, device_declaration = 0;
591 static int cpu0_initialized;
593 pr = acpi_driver_data(device);
597 if (num_online_cpus() > 1)
600 acpi_processor_errata(pr);
603 * Check to see if we have bus mastering arbitration control. This
604 * is required for proper C3 usage (to maintain cache coherency).
606 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
607 pr->flags.bm_control = 1;
608 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
609 "Bus mastering arbitration control present\n"));
611 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
612 "No bus mastering arbitration control\n"));
614 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
615 /* Declared with "Processor" statement; match ProcessorID */
616 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
617 if (ACPI_FAILURE(status)) {
618 printk(KERN_ERR PREFIX "Evaluating processor object\n");
623 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
624 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
627 pr->acpi_id = object.processor.proc_id;
630 * Declared with "Device" statement; match _UID.
631 * Note that we don't handle string _UIDs yet.
633 unsigned long long value;
634 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
636 if (ACPI_FAILURE(status)) {
637 printk(KERN_ERR PREFIX
638 "Evaluating processor _UID [%#x]\n", status);
641 device_declaration = 1;
644 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
646 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
647 if (!cpu0_initialized && (cpu_index == -1) &&
648 (num_online_cpus() == 1)) {
652 cpu0_initialized = 1;
657 * Extra Processor objects may be enumerated on MP systems with
658 * less than the max # of CPUs. They should be ignored _iff
659 * they are physically not present.
663 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
668 * On some boxes several processors use the same processor bus id.
669 * But they are located in different scope. For example:
672 * Rename the processor device bus id. And the new bus id will be
673 * generated as the following format:
676 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
677 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
680 if (!object.processor.pblk_address)
681 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
682 else if (object.processor.pblk_length != 6)
683 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
684 object.processor.pblk_length);
686 pr->throttling.address = object.processor.pblk_address;
687 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
688 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
690 pr->pblk = object.processor.pblk_address;
693 * We don't care about error returns - we just try to mark
694 * these reserved so that nobody else is confused into thinking
695 * that this region might be unused..
697 * (In particular, allocating the IO range for Cardbus)
699 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
703 * If ACPI describes a slot number for this CPU, we can use it
704 * ensure we get the right value in the "physical id" field
707 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
708 if (ACPI_SUCCESS(status))
709 arch_fix_phys_package_id(pr->id, object.integer.value);
714 static DEFINE_PER_CPU(void *, processor_device_array);
716 static void acpi_processor_notify(struct acpi_device *device, u32 event)
718 struct acpi_processor *pr = acpi_driver_data(device);
725 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
726 saved = pr->performance_platform_limit;
727 acpi_processor_ppc_has_changed(pr, 1);
728 if (saved == pr->performance_platform_limit)
730 acpi_bus_generate_proc_event(device, event,
731 pr->performance_platform_limit);
732 acpi_bus_generate_netlink_event(device->pnp.device_class,
733 dev_name(&device->dev), event,
734 pr->performance_platform_limit);
736 case ACPI_PROCESSOR_NOTIFY_POWER:
737 acpi_processor_cst_has_changed(pr);
738 acpi_bus_generate_proc_event(device, event, 0);
739 acpi_bus_generate_netlink_event(device->pnp.device_class,
740 dev_name(&device->dev), event, 0);
742 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
743 acpi_processor_tstate_has_changed(pr);
744 acpi_bus_generate_proc_event(device, event, 0);
745 acpi_bus_generate_netlink_event(device->pnp.device_class,
746 dev_name(&device->dev), event, 0);
748 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
749 "Unsupported event [0x%x]\n", event));
756 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
757 unsigned long action, void *hcpu)
759 unsigned int cpu = (unsigned long)hcpu;
760 struct acpi_processor *pr = per_cpu(processors, cpu);
762 if (action == CPU_ONLINE && pr) {
763 acpi_processor_ppc_has_changed(pr, 0);
764 acpi_processor_cst_has_changed(pr);
765 acpi_processor_tstate_has_changed(pr);
770 static struct notifier_block acpi_cpu_notifier =
772 .notifier_call = acpi_cpu_soft_notify,
775 static int __cpuinit acpi_processor_add(struct acpi_device *device)
777 struct acpi_processor *pr = NULL;
779 struct sys_device *sysdev;
781 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
785 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
790 pr->handle = device->handle;
791 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
792 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
793 device->driver_data = pr;
795 result = acpi_processor_get_info(device);
797 /* Processor is physically not present */
801 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
805 * ACPI id of processors can be reported wrongly by the BIOS.
806 * Don't trust it blindly
808 if (per_cpu(processor_device_array, pr->id) != NULL &&
809 per_cpu(processor_device_array, pr->id) != device) {
810 printk(KERN_WARNING "BIOS reported wrong ACPI id "
811 "for the processor\n");
813 goto err_free_cpumask;
815 per_cpu(processor_device_array, pr->id) = device;
817 per_cpu(processors, pr->id) = pr;
819 result = acpi_processor_add_fs(device);
821 goto err_free_cpumask;
823 sysdev = get_cpu_sysdev(pr->id);
824 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
829 /* _PDC call should be done before doing anything else (if reqd.). */
830 arch_acpi_processor_init_pdc(pr);
831 acpi_processor_set_pdc(pr);
832 arch_acpi_processor_cleanup_pdc(pr);
834 #ifdef CONFIG_CPU_FREQ
835 acpi_processor_ppc_has_changed(pr, 0);
837 acpi_processor_get_throttling_info(pr);
838 acpi_processor_get_limit_info(pr);
841 acpi_processor_power_init(pr, device);
843 pr->cdev = thermal_cooling_device_register("Processor", device,
844 &processor_cooling_ops);
845 if (IS_ERR(pr->cdev)) {
846 result = PTR_ERR(pr->cdev);
850 dev_dbg(&device->dev, "registered as cooling_device%d\n",
853 result = sysfs_create_link(&device->dev.kobj,
854 &pr->cdev->device.kobj,
857 printk(KERN_ERR PREFIX "Create sysfs link\n");
858 goto err_thermal_unregister;
860 result = sysfs_create_link(&pr->cdev->device.kobj,
864 printk(KERN_ERR PREFIX "Create sysfs link\n");
865 goto err_remove_sysfs;
871 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
872 err_thermal_unregister:
873 thermal_cooling_device_unregister(pr->cdev);
875 acpi_processor_power_exit(pr, device);
877 acpi_processor_remove_fs(device);
879 free_cpumask_var(pr->throttling.shared_cpu_map);
884 static int acpi_processor_remove(struct acpi_device *device, int type)
886 struct acpi_processor *pr = NULL;
889 if (!device || !acpi_driver_data(device))
892 pr = acpi_driver_data(device);
894 if (pr->id >= nr_cpu_ids)
897 if (type == ACPI_BUS_REMOVAL_EJECT) {
898 if (acpi_processor_handle_eject(pr))
902 acpi_processor_power_exit(pr, device);
904 sysfs_remove_link(&device->dev.kobj, "sysdev");
906 acpi_processor_remove_fs(device);
909 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
910 sysfs_remove_link(&pr->cdev->device.kobj, "device");
911 thermal_cooling_device_unregister(pr->cdev);
915 per_cpu(processors, pr->id) = NULL;
916 per_cpu(processor_device_array, pr->id) = NULL;
919 free_cpumask_var(pr->throttling.shared_cpu_map);
925 #ifdef CONFIG_ACPI_HOTPLUG_CPU
926 /****************************************************************************
927 * Acpi processor hotplug support *
928 ****************************************************************************/
930 static int is_processor_present(acpi_handle handle)
933 unsigned long long sta = 0;
936 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
938 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
942 * _STA is mandatory for a processor that supports hot plug
944 if (status == AE_NOT_FOUND)
945 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
946 "Processor does not support hot plug\n"));
948 ACPI_EXCEPTION((AE_INFO, status,
949 "Processor Device is not present"));
954 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
957 struct acpi_device *pdev;
960 if (acpi_get_parent(handle, &phandle)) {
964 if (acpi_bus_get_device(phandle, &pdev)) {
968 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
975 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
976 u32 event, void *data)
978 struct acpi_processor *pr;
979 struct acpi_device *device = NULL;
984 case ACPI_NOTIFY_BUS_CHECK:
985 case ACPI_NOTIFY_DEVICE_CHECK:
986 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
987 "Processor driver received %s event\n",
988 (event == ACPI_NOTIFY_BUS_CHECK) ?
989 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
991 if (!is_processor_present(handle))
994 if (acpi_bus_get_device(handle, &device)) {
995 result = acpi_processor_device_add(handle, &device);
997 printk(KERN_ERR PREFIX
998 "Unable to add the device\n");
1002 case ACPI_NOTIFY_EJECT_REQUEST:
1003 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1004 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
1006 if (acpi_bus_get_device(handle, &device)) {
1007 printk(KERN_ERR PREFIX
1008 "Device don't exist, dropping EJECT\n");
1011 pr = acpi_driver_data(device);
1013 printk(KERN_ERR PREFIX
1014 "Driver data is NULL, dropping EJECT\n");
1019 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1020 "Unsupported event [0x%x]\n", event));
1028 processor_walk_namespace_cb(acpi_handle handle,
1029 u32 lvl, void *context, void **rv)
1032 int *action = context;
1033 acpi_object_type type = 0;
1035 status = acpi_get_type(handle, &type);
1036 if (ACPI_FAILURE(status))
1039 if (type != ACPI_TYPE_PROCESSOR)
1043 case INSTALL_NOTIFY_HANDLER:
1044 acpi_install_notify_handler(handle,
1046 acpi_processor_hotplug_notify,
1049 case UNINSTALL_NOTIFY_HANDLER:
1050 acpi_remove_notify_handler(handle,
1052 acpi_processor_hotplug_notify);
1061 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1064 if (!is_processor_present(handle)) {
1068 if (acpi_map_lsapic(handle, p_cpu))
1071 if (arch_register_cpu(*p_cpu)) {
1072 acpi_unmap_lsapic(*p_cpu);
1079 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1081 if (cpu_online(pr->id))
1084 arch_unregister_cpu(pr->id);
1085 acpi_unmap_lsapic(pr->id);
1089 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1093 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1100 void acpi_processor_install_hotplug_notify(void)
1102 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1103 int action = INSTALL_NOTIFY_HANDLER;
1104 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1107 processor_walk_namespace_cb, NULL, &action, NULL);
1109 register_hotcpu_notifier(&acpi_cpu_notifier);
1113 void acpi_processor_uninstall_hotplug_notify(void)
1115 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1116 int action = UNINSTALL_NOTIFY_HANDLER;
1117 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1120 processor_walk_namespace_cb, NULL, &action, NULL);
1122 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1126 * We keep the driver loaded even when ACPI is not running.
1127 * This is needed for the powernow-k8 driver, that works even without
1128 * ACPI, but needs symbols from this driver
1131 static int __init acpi_processor_init(void)
1138 memset(&errata, 0, sizeof(errata));
1141 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1142 (struct acpi_table_header **)&madt)))
1145 #ifdef CONFIG_ACPI_PROCFS
1146 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1147 if (!acpi_processor_dir)
1151 * Check whether the system is DMI table. If yes, OSPM
1152 * should not use mwait for CPU-states.
1154 dmi_check_system(processor_idle_dmi_table);
1155 result = cpuidle_register_driver(&acpi_idle_driver);
1159 result = acpi_bus_register_driver(&acpi_processor_driver);
1163 acpi_processor_install_hotplug_notify();
1165 acpi_thermal_cpufreq_init();
1167 acpi_processor_ppc_init();
1169 acpi_processor_throttling_init();
1174 cpuidle_unregister_driver(&acpi_idle_driver);
1177 #ifdef CONFIG_ACPI_PROCFS
1178 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1184 static void __exit acpi_processor_exit(void)
1189 acpi_processor_ppc_exit();
1191 acpi_thermal_cpufreq_exit();
1193 acpi_processor_uninstall_hotplug_notify();
1195 acpi_bus_unregister_driver(&acpi_processor_driver);
1197 cpuidle_unregister_driver(&acpi_idle_driver);
1199 #ifdef CONFIG_ACPI_PROCFS
1200 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1206 module_init(acpi_processor_init);
1207 module_exit(acpi_processor_exit);
1209 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1211 MODULE_ALIAS("processor");