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 ACPI_PROCESSOR_CLASS "processor"
63 #define ACPI_PROCESSOR_DEVICE_NAME "Processor"
64 #define ACPI_PROCESSOR_FILE_INFO "info"
65 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
66 #define ACPI_PROCESSOR_FILE_LIMIT "limit"
67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
68 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81
69 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
71 #define ACPI_PROCESSOR_LIMIT_USER 0
72 #define ACPI_PROCESSOR_LIMIT_THERMAL 1
74 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
75 ACPI_MODULE_NAME("processor_core");
77 MODULE_AUTHOR("Paul Diefenbaugh");
78 MODULE_DESCRIPTION("ACPI Processor Driver");
79 MODULE_LICENSE("GPL");
81 static int acpi_processor_add(struct acpi_device *device);
82 static int acpi_processor_start(struct acpi_device *device);
83 static int acpi_processor_remove(struct acpi_device *device, int type);
84 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
85 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
86 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
87 static int acpi_processor_handle_eject(struct acpi_processor *pr);
90 static const struct acpi_device_id processor_device_ids[] = {
91 {ACPI_PROCESSOR_HID, 0},
94 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
96 static struct acpi_driver acpi_processor_driver = {
98 .class = ACPI_PROCESSOR_CLASS,
99 .ids = processor_device_ids,
101 .add = acpi_processor_add,
102 .remove = acpi_processor_remove,
103 .start = acpi_processor_start,
104 .suspend = acpi_processor_suspend,
105 .resume = acpi_processor_resume,
109 #define INSTALL_NOTIFY_HANDLER 1
110 #define UNINSTALL_NOTIFY_HANDLER 2
112 static const struct file_operations acpi_processor_info_fops = {
113 .owner = THIS_MODULE,
114 .open = acpi_processor_info_open_fs,
117 .release = single_release,
120 DEFINE_PER_CPU(struct acpi_processor *, processors);
121 struct acpi_processor_errata errata __read_mostly;
122 static int set_no_mwait(const struct dmi_system_id *id)
124 printk(KERN_NOTICE PREFIX "%s detected - "
125 "disabling mwait for CPU C-states\n", id->ident);
130 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
132 set_no_mwait, "IFL91 board", {
133 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
134 DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
135 DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
136 DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
138 set_no_mwait, "Extensa 5220", {
139 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
140 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
141 DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
142 DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
146 /* --------------------------------------------------------------------------
148 -------------------------------------------------------------------------- */
150 static int acpi_processor_errata_piix4(struct pci_dev *dev)
160 * Note that 'dev' references the PIIX4 ACPI Controller.
163 switch (dev->revision) {
165 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
168 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
171 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
174 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
177 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
181 switch (dev->revision) {
183 case 0: /* PIIX4 A-step */
184 case 1: /* PIIX4 B-step */
186 * See specification changes #13 ("Manual Throttle Duty Cycle")
187 * and #14 ("Enabling and Disabling Manual Throttle"), plus
188 * erratum #5 ("STPCLK# Deassertion Time") from the January
189 * 2002 PIIX4 specification update. Applies to only older
192 errata.piix4.throttle = 1;
197 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
198 * Livelock") from the January 2002 PIIX4 specification update.
199 * Applies to all PIIX4 models.
205 * Find the PIIX4 IDE Controller and get the Bus Master IDE
206 * Status register address. We'll use this later to read
207 * each IDE controller's DMA status to make sure we catch all
210 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
211 PCI_DEVICE_ID_INTEL_82371AB,
212 PCI_ANY_ID, PCI_ANY_ID, NULL);
214 errata.piix4.bmisx = pci_resource_start(dev, 4);
221 * Find the PIIX4 ISA Controller and read the Motherboard
222 * DMA controller's status to see if Type-F (Fast) DMA mode
223 * is enabled (bit 7) on either channel. Note that we'll
224 * disable C3 support if this is enabled, as some legacy
225 * devices won't operate well if fast DMA is disabled.
227 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
228 PCI_DEVICE_ID_INTEL_82371AB_0,
229 PCI_ANY_ID, PCI_ANY_ID, NULL);
231 pci_read_config_byte(dev, 0x76, &value1);
232 pci_read_config_byte(dev, 0x77, &value2);
233 if ((value1 & 0x80) || (value2 & 0x80))
234 errata.piix4.fdma = 1;
241 if (errata.piix4.bmisx)
242 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
243 "Bus master activity detection (BM-IDE) erratum enabled\n"));
244 if (errata.piix4.fdma)
245 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
246 "Type-F DMA livelock erratum (C3 disabled)\n"));
251 static int acpi_processor_errata(struct acpi_processor *pr)
254 struct pci_dev *dev = NULL;
263 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
264 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
267 result = acpi_processor_errata_piix4(dev);
274 /* --------------------------------------------------------------------------
275 Common ACPI processor functions
276 -------------------------------------------------------------------------- */
279 * _PDC is required for a BIOS-OS handshake for most of the newer
280 * ACPI processor features.
282 static int acpi_processor_set_pdc(struct acpi_processor *pr)
284 struct acpi_object_list *pdc_in = pr->pdc;
285 acpi_status status = AE_OK;
292 * If mwait is disabled for CPU C-states, the C2C3_FFH access
293 * mode will be disabled in the parameter of _PDC object.
294 * Of course C1_FFH access mode will also be disabled.
296 union acpi_object *obj;
299 obj = pdc_in->pointer;
300 buffer = (u32 *)(obj->buffer.pointer);
301 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
304 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
306 if (ACPI_FAILURE(status))
307 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
308 "Could not evaluate _PDC, using legacy perf. control...\n"));
313 /* --------------------------------------------------------------------------
315 -------------------------------------------------------------------------- */
317 static struct proc_dir_entry *acpi_processor_dir = NULL;
319 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
321 struct acpi_processor *pr = seq->private;
327 seq_printf(seq, "processor id: %d\n"
329 "bus mastering control: %s\n"
330 "power management: %s\n"
331 "throttling control: %s\n"
332 "limit interface: %s\n",
335 pr->flags.bm_control ? "yes" : "no",
336 pr->flags.power ? "yes" : "no",
337 pr->flags.throttling ? "yes" : "no",
338 pr->flags.limit ? "yes" : "no");
344 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
346 return single_open(file, acpi_processor_info_seq_show,
350 static int acpi_processor_add_fs(struct acpi_device *device)
352 struct proc_dir_entry *entry = NULL;
355 if (!acpi_device_dir(device)) {
356 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
358 if (!acpi_device_dir(device))
361 acpi_device_dir(device)->owner = THIS_MODULE;
364 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
365 S_IRUGO, acpi_device_dir(device),
366 &acpi_processor_info_fops,
367 acpi_driver_data(device));
371 /* 'throttling' [R/W] */
372 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
373 S_IFREG | S_IRUGO | S_IWUSR,
374 acpi_device_dir(device),
375 &acpi_processor_throttling_fops,
376 acpi_driver_data(device));
381 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
382 S_IFREG | S_IRUGO | S_IWUSR,
383 acpi_device_dir(device),
384 &acpi_processor_limit_fops,
385 acpi_driver_data(device));
391 static int acpi_processor_remove_fs(struct acpi_device *device)
394 if (acpi_device_dir(device)) {
395 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
396 acpi_device_dir(device));
397 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
398 acpi_device_dir(device));
399 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
400 acpi_device_dir(device));
401 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
402 acpi_device_dir(device) = NULL;
408 /* Use the acpiid in MADT to map cpus in case of SMP */
411 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
414 static struct acpi_table_madt *madt;
416 static int map_lapic_id(struct acpi_subtable_header *entry,
417 u32 acpi_id, int *apic_id)
419 struct acpi_madt_local_apic *lapic =
420 (struct acpi_madt_local_apic *)entry;
421 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
422 lapic->processor_id == acpi_id) {
423 *apic_id = lapic->id;
429 static int map_lsapic_id(struct acpi_subtable_header *entry,
430 u32 acpi_id, int *apic_id)
432 struct acpi_madt_local_sapic *lsapic =
433 (struct acpi_madt_local_sapic *)entry;
434 /* Only check enabled APICs*/
435 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
436 /* First check against id */
437 if (lsapic->processor_id == acpi_id) {
438 *apic_id = (lsapic->id << 8) | lsapic->eid;
440 /* Check against optional uid */
441 } else if (entry->length >= 16 &&
442 lsapic->uid == acpi_id) {
443 *apic_id = lsapic->uid;
450 static int map_madt_entry(u32 acpi_id)
452 unsigned long madt_end, entry;
458 entry = (unsigned long)madt;
459 madt_end = entry + madt->header.length;
461 /* Parse all entries looking for a match. */
463 entry += sizeof(struct acpi_table_madt);
464 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
465 struct acpi_subtable_header *header =
466 (struct acpi_subtable_header *)entry;
467 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
468 if (map_lapic_id(header, acpi_id, &apic_id))
470 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
471 if (map_lsapic_id(header, acpi_id, &apic_id))
474 entry += header->length;
479 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
481 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
482 union acpi_object *obj;
483 struct acpi_subtable_header *header;
486 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
489 if (!buffer.length || !buffer.pointer)
492 obj = buffer.pointer;
493 if (obj->type != ACPI_TYPE_BUFFER ||
494 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
498 header = (struct acpi_subtable_header *)obj->buffer.pointer;
499 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
500 map_lapic_id(header, acpi_id, &apic_id);
501 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
502 map_lsapic_id(header, acpi_id, &apic_id);
507 kfree(buffer.pointer);
511 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
516 apic_id = map_mat_entry(handle, acpi_id);
518 apic_id = map_madt_entry(acpi_id);
522 for_each_possible_cpu(i) {
523 if (cpu_physical_id(i) == apic_id)
530 /* --------------------------------------------------------------------------
532 -------------------------------------------------------------------------- */
534 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
536 acpi_status status = 0;
537 union acpi_object object = { 0 };
538 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
540 static int cpu0_initialized;
546 if (num_online_cpus() > 1)
549 acpi_processor_errata(pr);
552 * Check to see if we have bus mastering arbitration control. This
553 * is required for proper C3 usage (to maintain cache coherency).
555 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
556 pr->flags.bm_control = 1;
557 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
558 "Bus mastering arbitration control present\n"));
560 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
561 "No bus mastering arbitration control\n"));
563 /* Check if it is a Device with HID and UID */
565 unsigned long long value;
566 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
568 if (ACPI_FAILURE(status)) {
569 printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
575 * Evalute the processor object. Note that it is common on SMP to
576 * have the first (boot) processor with a valid PBLK address while
577 * all others have a NULL address.
579 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
580 if (ACPI_FAILURE(status)) {
581 printk(KERN_ERR PREFIX "Evaluating processor object\n");
586 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
587 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
589 pr->acpi_id = object.processor.proc_id;
591 cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
593 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
594 if (!cpu0_initialized && (cpu_index == -1) &&
595 (num_online_cpus() == 1)) {
599 cpu0_initialized = 1;
604 * Extra Processor objects may be enumerated on MP systems with
605 * less than the max # of CPUs. They should be ignored _iff
606 * they are physically not present.
610 (acpi_processor_hotadd_init(pr->handle, &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 int __cpuinit acpi_processor_start(struct acpi_device *device)
657 acpi_status status = AE_OK;
658 struct acpi_processor *pr;
659 struct sys_device *sysdev;
661 pr = acpi_driver_data(device);
663 result = acpi_processor_get_info(pr, device->flags.unique_id);
665 /* Processor is physically not present */
669 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
673 * ACPI id of processors can be reported wrongly by the BIOS.
674 * Don't trust it blindly
676 if (per_cpu(processor_device_array, pr->id) != NULL &&
677 per_cpu(processor_device_array, pr->id) != device) {
678 printk(KERN_WARNING "BIOS reported wrong ACPI id "
679 "for the processor\n");
682 per_cpu(processor_device_array, pr->id) = device;
684 per_cpu(processors, pr->id) = pr;
686 result = acpi_processor_add_fs(device);
690 sysdev = get_cpu_sysdev(pr->id);
691 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
694 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
695 acpi_processor_notify, pr);
697 /* _PDC call should be done before doing anything else (if reqd.). */
698 arch_acpi_processor_init_pdc(pr);
699 acpi_processor_set_pdc(pr);
700 #ifdef CONFIG_CPU_FREQ
701 acpi_processor_ppc_has_changed(pr);
703 acpi_processor_get_throttling_info(pr);
704 acpi_processor_get_limit_info(pr);
707 acpi_processor_power_init(pr, device);
709 pr->cdev = thermal_cooling_device_register("Processor", device,
710 &processor_cooling_ops);
711 if (IS_ERR(pr->cdev)) {
712 result = PTR_ERR(pr->cdev);
716 dev_info(&device->dev, "registered as cooling_device%d\n",
719 result = sysfs_create_link(&device->dev.kobj,
720 &pr->cdev->device.kobj,
723 printk(KERN_ERR PREFIX "Create sysfs link\n");
724 result = sysfs_create_link(&pr->cdev->device.kobj,
728 printk(KERN_ERR PREFIX "Create sysfs link\n");
730 if (pr->flags.throttling) {
731 printk(KERN_INFO PREFIX "%s [%s] (supports",
732 acpi_device_name(device), acpi_device_bid(device));
733 printk(" %d throttling states", pr->throttling.state_count);
742 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
744 struct acpi_processor *pr = data;
745 struct acpi_device *device = NULL;
751 if (acpi_bus_get_device(pr->handle, &device))
755 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
756 saved = pr->performance_platform_limit;
757 acpi_processor_ppc_has_changed(pr);
758 if (saved == pr->performance_platform_limit)
760 acpi_bus_generate_proc_event(device, event,
761 pr->performance_platform_limit);
762 acpi_bus_generate_netlink_event(device->pnp.device_class,
763 device->dev.bus_id, event,
764 pr->performance_platform_limit);
766 case ACPI_PROCESSOR_NOTIFY_POWER:
767 acpi_processor_cst_has_changed(pr);
768 acpi_bus_generate_proc_event(device, event, 0);
769 acpi_bus_generate_netlink_event(device->pnp.device_class,
770 device->dev.bus_id, event, 0);
772 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
773 acpi_processor_tstate_has_changed(pr);
774 acpi_bus_generate_proc_event(device, event, 0);
775 acpi_bus_generate_netlink_event(device->pnp.device_class,
776 device->dev.bus_id, event, 0);
778 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
779 "Unsupported event [0x%x]\n", event));
786 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
787 unsigned long action, void *hcpu)
789 unsigned int cpu = (unsigned long)hcpu;
790 struct acpi_processor *pr = per_cpu(processors, cpu);
792 if (action == CPU_ONLINE && pr) {
793 acpi_processor_ppc_has_changed(pr);
794 acpi_processor_cst_has_changed(pr);
795 acpi_processor_tstate_has_changed(pr);
800 static struct notifier_block acpi_cpu_notifier =
802 .notifier_call = acpi_cpu_soft_notify,
805 static int acpi_processor_add(struct acpi_device *device)
807 struct acpi_processor *pr = NULL;
813 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
817 pr->handle = device->handle;
818 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
819 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
820 device->driver_data = pr;
825 static int acpi_processor_remove(struct acpi_device *device, int type)
827 acpi_status status = AE_OK;
828 struct acpi_processor *pr = NULL;
831 if (!device || !acpi_driver_data(device))
834 pr = acpi_driver_data(device);
836 if (pr->id >= nr_cpu_ids) {
841 if (type == ACPI_BUS_REMOVAL_EJECT) {
842 if (acpi_processor_handle_eject(pr))
846 acpi_processor_power_exit(pr, device);
848 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
849 acpi_processor_notify);
851 sysfs_remove_link(&device->dev.kobj, "sysdev");
853 acpi_processor_remove_fs(device);
856 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
857 sysfs_remove_link(&pr->cdev->device.kobj, "device");
858 thermal_cooling_device_unregister(pr->cdev);
862 per_cpu(processors, pr->id) = NULL;
863 per_cpu(processor_device_array, pr->id) = NULL;
869 #ifdef CONFIG_ACPI_HOTPLUG_CPU
870 /****************************************************************************
871 * Acpi processor hotplug support *
872 ****************************************************************************/
874 static int is_processor_present(acpi_handle handle)
877 unsigned long long sta = 0;
880 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
882 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
886 * _STA is mandatory for a processor that supports hot plug
888 if (status == AE_NOT_FOUND)
889 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
890 "Processor does not support hot plug\n"));
892 ACPI_EXCEPTION((AE_INFO, status,
893 "Processor Device is not present"));
898 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
901 struct acpi_device *pdev;
902 struct acpi_processor *pr;
905 if (acpi_get_parent(handle, &phandle)) {
909 if (acpi_bus_get_device(phandle, &pdev)) {
913 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
917 acpi_bus_start(*device);
919 pr = acpi_driver_data(*device);
923 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
924 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
929 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
930 u32 event, void *data)
932 struct acpi_processor *pr;
933 struct acpi_device *device = NULL;
938 case ACPI_NOTIFY_BUS_CHECK:
939 case ACPI_NOTIFY_DEVICE_CHECK:
940 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
941 "Processor driver received %s event\n",
942 (event == ACPI_NOTIFY_BUS_CHECK) ?
943 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
945 if (!is_processor_present(handle))
948 if (acpi_bus_get_device(handle, &device)) {
949 result = acpi_processor_device_add(handle, &device);
951 printk(KERN_ERR PREFIX
952 "Unable to add the device\n");
956 pr = acpi_driver_data(device);
958 printk(KERN_ERR PREFIX "Driver data is NULL\n");
962 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
963 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
967 result = acpi_processor_start(device);
968 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
969 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
971 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
972 acpi_device_bid(device));
975 case ACPI_NOTIFY_EJECT_REQUEST:
976 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
977 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
979 if (acpi_bus_get_device(handle, &device)) {
980 printk(KERN_ERR PREFIX
981 "Device don't exist, dropping EJECT\n");
984 pr = acpi_driver_data(device);
986 printk(KERN_ERR PREFIX
987 "Driver data is NULL, dropping EJECT\n");
991 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
992 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
995 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
996 "Unsupported event [0x%x]\n", event));
1004 processor_walk_namespace_cb(acpi_handle handle,
1005 u32 lvl, void *context, void **rv)
1008 int *action = context;
1009 acpi_object_type type = 0;
1011 status = acpi_get_type(handle, &type);
1012 if (ACPI_FAILURE(status))
1015 if (type != ACPI_TYPE_PROCESSOR)
1019 case INSTALL_NOTIFY_HANDLER:
1020 acpi_install_notify_handler(handle,
1022 acpi_processor_hotplug_notify,
1025 case UNINSTALL_NOTIFY_HANDLER:
1026 acpi_remove_notify_handler(handle,
1028 acpi_processor_hotplug_notify);
1037 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1040 if (!is_processor_present(handle)) {
1044 if (acpi_map_lsapic(handle, p_cpu))
1047 if (arch_register_cpu(*p_cpu)) {
1048 acpi_unmap_lsapic(*p_cpu);
1055 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1057 if (cpu_online(pr->id))
1060 arch_unregister_cpu(pr->id);
1061 acpi_unmap_lsapic(pr->id);
1065 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1069 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1076 void acpi_processor_install_hotplug_notify(void)
1078 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1079 int action = INSTALL_NOTIFY_HANDLER;
1080 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1083 processor_walk_namespace_cb, &action, NULL);
1085 register_hotcpu_notifier(&acpi_cpu_notifier);
1089 void acpi_processor_uninstall_hotplug_notify(void)
1091 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1092 int action = UNINSTALL_NOTIFY_HANDLER;
1093 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1096 processor_walk_namespace_cb, &action, NULL);
1098 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1102 * We keep the driver loaded even when ACPI is not running.
1103 * This is needed for the powernow-k8 driver, that works even without
1104 * ACPI, but needs symbols from this driver
1107 static int __init acpi_processor_init(void)
1111 memset(&errata, 0, sizeof(errata));
1114 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1115 (struct acpi_table_header **)&madt)))
1119 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1120 if (!acpi_processor_dir)
1122 acpi_processor_dir->owner = THIS_MODULE;
1125 * Check whether the system is DMI table. If yes, OSPM
1126 * should not use mwait for CPU-states.
1128 dmi_check_system(processor_idle_dmi_table);
1129 result = cpuidle_register_driver(&acpi_idle_driver);
1133 result = acpi_bus_register_driver(&acpi_processor_driver);
1137 acpi_processor_install_hotplug_notify();
1139 acpi_thermal_cpufreq_init();
1141 acpi_processor_ppc_init();
1143 acpi_processor_throttling_init();
1148 cpuidle_unregister_driver(&acpi_idle_driver);
1151 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1156 static void __exit acpi_processor_exit(void)
1158 acpi_processor_ppc_exit();
1160 acpi_thermal_cpufreq_exit();
1162 acpi_processor_uninstall_hotplug_notify();
1164 acpi_bus_unregister_driver(&acpi_processor_driver);
1166 cpuidle_unregister_driver(&acpi_idle_driver);
1168 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1173 module_init(acpi_processor_init);
1174 module_exit(acpi_processor_exit);
1176 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1178 MODULE_ALIAS("processor");