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_COMPONENT 0x01000000
63 #define ACPI_PROCESSOR_CLASS "processor"
64 #define ACPI_PROCESSOR_DEVICE_NAME "Processor"
65 #define ACPI_PROCESSOR_FILE_INFO "info"
66 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
67 #define ACPI_PROCESSOR_FILE_LIMIT "limit"
68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
69 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81
70 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
72 #define ACPI_PROCESSOR_LIMIT_USER 0
73 #define ACPI_PROCESSOR_LIMIT_THERMAL 1
75 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
76 ACPI_MODULE_NAME("processor_core");
78 MODULE_AUTHOR("Paul Diefenbaugh");
79 MODULE_DESCRIPTION("ACPI Processor Driver");
80 MODULE_LICENSE("GPL");
82 static int acpi_processor_add(struct acpi_device *device);
83 static int acpi_processor_start(struct acpi_device *device);
84 static int acpi_processor_remove(struct acpi_device *device, int type);
85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
86 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
87 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
88 static int acpi_processor_handle_eject(struct acpi_processor *pr);
91 static const struct acpi_device_id processor_device_ids[] = {
92 {ACPI_PROCESSOR_OBJECT_HID, 0},
93 {ACPI_PROCESSOR_HID, 0},
96 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
98 static struct acpi_driver acpi_processor_driver = {
100 .class = ACPI_PROCESSOR_CLASS,
101 .ids = processor_device_ids,
103 .add = acpi_processor_add,
104 .remove = acpi_processor_remove,
105 .start = acpi_processor_start,
106 .suspend = acpi_processor_suspend,
107 .resume = acpi_processor_resume,
111 #define INSTALL_NOTIFY_HANDLER 1
112 #define UNINSTALL_NOTIFY_HANDLER 2
114 static const struct file_operations acpi_processor_info_fops = {
115 .owner = THIS_MODULE,
116 .open = acpi_processor_info_open_fs,
119 .release = single_release,
122 DEFINE_PER_CPU(struct acpi_processor *, processors);
123 struct acpi_processor_errata errata __read_mostly;
124 static int set_no_mwait(const struct dmi_system_id *id)
126 printk(KERN_NOTICE PREFIX "%s detected - "
127 "disabling mwait for CPU C-states\n", id->ident);
132 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
134 set_no_mwait, "IFL91 board", {
135 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
136 DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
137 DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
138 DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
140 set_no_mwait, "Extensa 5220", {
141 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
142 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
143 DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
144 DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
148 /* --------------------------------------------------------------------------
150 -------------------------------------------------------------------------- */
152 static int acpi_processor_errata_piix4(struct pci_dev *dev)
162 * Note that 'dev' references the PIIX4 ACPI Controller.
165 switch (dev->revision) {
167 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
170 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
173 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
176 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
179 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
183 switch (dev->revision) {
185 case 0: /* PIIX4 A-step */
186 case 1: /* PIIX4 B-step */
188 * See specification changes #13 ("Manual Throttle Duty Cycle")
189 * and #14 ("Enabling and Disabling Manual Throttle"), plus
190 * erratum #5 ("STPCLK# Deassertion Time") from the January
191 * 2002 PIIX4 specification update. Applies to only older
194 errata.piix4.throttle = 1;
199 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
200 * Livelock") from the January 2002 PIIX4 specification update.
201 * Applies to all PIIX4 models.
207 * Find the PIIX4 IDE Controller and get the Bus Master IDE
208 * Status register address. We'll use this later to read
209 * each IDE controller's DMA status to make sure we catch all
212 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
213 PCI_DEVICE_ID_INTEL_82371AB,
214 PCI_ANY_ID, PCI_ANY_ID, NULL);
216 errata.piix4.bmisx = pci_resource_start(dev, 4);
223 * Find the PIIX4 ISA Controller and read the Motherboard
224 * DMA controller's status to see if Type-F (Fast) DMA mode
225 * is enabled (bit 7) on either channel. Note that we'll
226 * disable C3 support if this is enabled, as some legacy
227 * devices won't operate well if fast DMA is disabled.
229 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
230 PCI_DEVICE_ID_INTEL_82371AB_0,
231 PCI_ANY_ID, PCI_ANY_ID, NULL);
233 pci_read_config_byte(dev, 0x76, &value1);
234 pci_read_config_byte(dev, 0x77, &value2);
235 if ((value1 & 0x80) || (value2 & 0x80))
236 errata.piix4.fdma = 1;
243 if (errata.piix4.bmisx)
244 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
245 "Bus master activity detection (BM-IDE) erratum enabled\n"));
246 if (errata.piix4.fdma)
247 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
248 "Type-F DMA livelock erratum (C3 disabled)\n"));
253 static int acpi_processor_errata(struct acpi_processor *pr)
256 struct pci_dev *dev = NULL;
265 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
266 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
269 result = acpi_processor_errata_piix4(dev);
276 /* --------------------------------------------------------------------------
277 Common ACPI processor functions
278 -------------------------------------------------------------------------- */
281 * _PDC is required for a BIOS-OS handshake for most of the newer
282 * ACPI processor features.
284 static int acpi_processor_set_pdc(struct acpi_processor *pr)
286 struct acpi_object_list *pdc_in = pr->pdc;
287 acpi_status status = AE_OK;
294 * If mwait is disabled for CPU C-states, the C2C3_FFH access
295 * mode will be disabled in the parameter of _PDC object.
296 * Of course C1_FFH access mode will also be disabled.
298 union acpi_object *obj;
301 obj = pdc_in->pointer;
302 buffer = (u32 *)(obj->buffer.pointer);
303 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
306 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
308 if (ACPI_FAILURE(status))
309 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
310 "Could not evaluate _PDC, using legacy perf. control...\n"));
315 /* --------------------------------------------------------------------------
317 -------------------------------------------------------------------------- */
319 static struct proc_dir_entry *acpi_processor_dir = NULL;
321 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
323 struct acpi_processor *pr = seq->private;
329 seq_printf(seq, "processor id: %d\n"
331 "bus mastering control: %s\n"
332 "power management: %s\n"
333 "throttling control: %s\n"
334 "limit interface: %s\n",
337 pr->flags.bm_control ? "yes" : "no",
338 pr->flags.power ? "yes" : "no",
339 pr->flags.throttling ? "yes" : "no",
340 pr->flags.limit ? "yes" : "no");
346 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
348 return single_open(file, acpi_processor_info_seq_show,
352 static int acpi_processor_add_fs(struct acpi_device *device)
354 struct proc_dir_entry *entry = NULL;
357 if (!acpi_device_dir(device)) {
358 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
360 if (!acpi_device_dir(device))
363 acpi_device_dir(device)->owner = THIS_MODULE;
366 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
367 S_IRUGO, acpi_device_dir(device),
368 &acpi_processor_info_fops,
369 acpi_driver_data(device));
373 /* 'throttling' [R/W] */
374 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
375 S_IFREG | S_IRUGO | S_IWUSR,
376 acpi_device_dir(device),
377 &acpi_processor_throttling_fops,
378 acpi_driver_data(device));
383 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
384 S_IFREG | S_IRUGO | S_IWUSR,
385 acpi_device_dir(device),
386 &acpi_processor_limit_fops,
387 acpi_driver_data(device));
393 static int acpi_processor_remove_fs(struct acpi_device *device)
396 if (acpi_device_dir(device)) {
397 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
398 acpi_device_dir(device));
399 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
400 acpi_device_dir(device));
401 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
402 acpi_device_dir(device));
403 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
404 acpi_device_dir(device) = NULL;
410 /* Use the acpiid in MADT to map cpus in case of SMP */
413 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
416 static struct acpi_table_madt *madt;
418 static int map_lapic_id(struct acpi_subtable_header *entry,
419 u32 acpi_id, int *apic_id)
421 struct acpi_madt_local_apic *lapic =
422 (struct acpi_madt_local_apic *)entry;
423 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
424 lapic->processor_id == acpi_id) {
425 *apic_id = lapic->id;
431 static int map_lsapic_id(struct acpi_subtable_header *entry,
432 int device_declaration, u32 acpi_id, int *apic_id)
434 struct acpi_madt_local_sapic *lsapic =
435 (struct acpi_madt_local_sapic *)entry;
436 u32 tmp = (lsapic->id << 8) | lsapic->eid;
438 /* Only check enabled APICs*/
439 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
442 /* Device statement declaration type */
443 if (device_declaration) {
444 if (entry->length < 16)
445 printk(KERN_ERR PREFIX
446 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
448 else if (lsapic->uid == acpi_id)
450 /* Processor statement declaration type */
451 } else if (lsapic->processor_id == acpi_id)
460 static int map_madt_entry(int type, u32 acpi_id)
462 unsigned long madt_end, entry;
468 entry = (unsigned long)madt;
469 madt_end = entry + madt->header.length;
471 /* Parse all entries looking for a match. */
473 entry += sizeof(struct acpi_table_madt);
474 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
475 struct acpi_subtable_header *header =
476 (struct acpi_subtable_header *)entry;
477 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
478 if (map_lapic_id(header, acpi_id, &apic_id))
480 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
481 if (map_lsapic_id(header, type, acpi_id, &apic_id))
484 entry += header->length;
489 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
491 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
492 union acpi_object *obj;
493 struct acpi_subtable_header *header;
496 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
499 if (!buffer.length || !buffer.pointer)
502 obj = buffer.pointer;
503 if (obj->type != ACPI_TYPE_BUFFER ||
504 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
508 header = (struct acpi_subtable_header *)obj->buffer.pointer;
509 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
510 map_lapic_id(header, acpi_id, &apic_id);
511 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
512 map_lsapic_id(header, type, acpi_id, &apic_id);
517 kfree(buffer.pointer);
521 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
526 apic_id = map_mat_entry(handle, type, acpi_id);
528 apic_id = map_madt_entry(type, acpi_id);
532 for_each_possible_cpu(i) {
533 if (cpu_physical_id(i) == apic_id)
540 /* --------------------------------------------------------------------------
542 -------------------------------------------------------------------------- */
544 static int acpi_processor_get_info(struct acpi_device *device)
546 acpi_status status = 0;
547 union acpi_object object = { 0 };
548 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
549 struct acpi_processor *pr;
550 int cpu_index, device_declaration = 0;
551 static int cpu0_initialized;
553 pr = acpi_driver_data(device);
557 if (num_online_cpus() > 1)
560 acpi_processor_errata(pr);
563 * Check to see if we have bus mastering arbitration control. This
564 * is required for proper C3 usage (to maintain cache coherency).
566 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
567 pr->flags.bm_control = 1;
568 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
569 "Bus mastering arbitration control present\n"));
571 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
572 "No bus mastering arbitration control\n"));
574 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) {
576 * Declared with "Device" statement; match _UID.
577 * Note that we don't handle string _UIDs yet.
579 unsigned long long value;
580 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
582 if (ACPI_FAILURE(status)) {
583 printk(KERN_ERR PREFIX
584 "Evaluating processor _UID [%#x]\n", status);
587 device_declaration = 1;
590 /* Declared with "Processor" statement; match ProcessorID */
591 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
592 if (ACPI_FAILURE(status)) {
593 printk(KERN_ERR PREFIX "Evaluating processor object\n");
598 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
599 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
602 pr->acpi_id = object.processor.proc_id;
604 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
606 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
607 if (!cpu0_initialized && (cpu_index == -1) &&
608 (num_online_cpus() == 1)) {
612 cpu0_initialized = 1;
617 * Extra Processor objects may be enumerated on MP systems with
618 * less than the max # of CPUs. They should be ignored _iff
619 * they are physically not present.
623 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
628 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
631 if (!object.processor.pblk_address)
632 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
633 else if (object.processor.pblk_length != 6)
634 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
635 object.processor.pblk_length);
637 pr->throttling.address = object.processor.pblk_address;
638 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
639 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
641 pr->pblk = object.processor.pblk_address;
644 * We don't care about error returns - we just try to mark
645 * these reserved so that nobody else is confused into thinking
646 * that this region might be unused..
648 * (In particular, allocating the IO range for Cardbus)
650 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
654 * If ACPI describes a slot number for this CPU, we can use it
655 * ensure we get the right value in the "physical id" field
658 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
659 if (ACPI_SUCCESS(status))
660 arch_fix_phys_package_id(pr->id, object.integer.value);
665 static DEFINE_PER_CPU(void *, processor_device_array);
667 static int __cpuinit acpi_processor_start(struct acpi_device *device)
670 acpi_status status = AE_OK;
671 struct acpi_processor *pr;
672 struct sys_device *sysdev;
674 pr = acpi_driver_data(device);
676 result = acpi_processor_get_info(device);
678 /* Processor is physically not present */
682 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
686 * ACPI id of processors can be reported wrongly by the BIOS.
687 * Don't trust it blindly
689 if (per_cpu(processor_device_array, pr->id) != NULL &&
690 per_cpu(processor_device_array, pr->id) != device) {
691 printk(KERN_WARNING "BIOS reported wrong ACPI id "
692 "for the processor\n");
695 per_cpu(processor_device_array, pr->id) = device;
697 per_cpu(processors, pr->id) = pr;
699 result = acpi_processor_add_fs(device);
703 sysdev = get_cpu_sysdev(pr->id);
704 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
707 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
708 acpi_processor_notify, pr);
710 /* _PDC call should be done before doing anything else (if reqd.). */
711 arch_acpi_processor_init_pdc(pr);
712 acpi_processor_set_pdc(pr);
713 #ifdef CONFIG_CPU_FREQ
714 acpi_processor_ppc_has_changed(pr);
716 acpi_processor_get_throttling_info(pr);
717 acpi_processor_get_limit_info(pr);
720 acpi_processor_power_init(pr, device);
722 pr->cdev = thermal_cooling_device_register("Processor", device,
723 &processor_cooling_ops);
724 if (IS_ERR(pr->cdev)) {
725 result = PTR_ERR(pr->cdev);
729 dev_info(&device->dev, "registered as cooling_device%d\n",
732 result = sysfs_create_link(&device->dev.kobj,
733 &pr->cdev->device.kobj,
736 printk(KERN_ERR PREFIX "Create sysfs link\n");
737 result = sysfs_create_link(&pr->cdev->device.kobj,
741 printk(KERN_ERR PREFIX "Create sysfs link\n");
743 if (pr->flags.throttling) {
744 printk(KERN_INFO PREFIX "%s [%s] (supports",
745 acpi_device_name(device), acpi_device_bid(device));
746 printk(" %d throttling states", pr->throttling.state_count);
755 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
757 struct acpi_processor *pr = data;
758 struct acpi_device *device = NULL;
764 if (acpi_bus_get_device(pr->handle, &device))
768 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
769 saved = pr->performance_platform_limit;
770 acpi_processor_ppc_has_changed(pr);
771 if (saved == pr->performance_platform_limit)
773 acpi_bus_generate_proc_event(device, event,
774 pr->performance_platform_limit);
775 acpi_bus_generate_netlink_event(device->pnp.device_class,
776 device->dev.bus_id, event,
777 pr->performance_platform_limit);
779 case ACPI_PROCESSOR_NOTIFY_POWER:
780 acpi_processor_cst_has_changed(pr);
781 acpi_bus_generate_proc_event(device, event, 0);
782 acpi_bus_generate_netlink_event(device->pnp.device_class,
783 device->dev.bus_id, event, 0);
785 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
786 acpi_processor_tstate_has_changed(pr);
787 acpi_bus_generate_proc_event(device, event, 0);
788 acpi_bus_generate_netlink_event(device->pnp.device_class,
789 device->dev.bus_id, event, 0);
791 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
792 "Unsupported event [0x%x]\n", event));
799 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
800 unsigned long action, void *hcpu)
802 unsigned int cpu = (unsigned long)hcpu;
803 struct acpi_processor *pr = per_cpu(processors, cpu);
805 if (action == CPU_ONLINE && pr) {
806 acpi_processor_ppc_has_changed(pr);
807 acpi_processor_cst_has_changed(pr);
808 acpi_processor_tstate_has_changed(pr);
813 static struct notifier_block acpi_cpu_notifier =
815 .notifier_call = acpi_cpu_soft_notify,
818 static int acpi_processor_add(struct acpi_device *device)
820 struct acpi_processor *pr = NULL;
826 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
830 pr->handle = device->handle;
831 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
832 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
833 device->driver_data = pr;
838 static int acpi_processor_remove(struct acpi_device *device, int type)
840 acpi_status status = AE_OK;
841 struct acpi_processor *pr = NULL;
844 if (!device || !acpi_driver_data(device))
847 pr = acpi_driver_data(device);
849 if (pr->id >= nr_cpu_ids) {
854 if (type == ACPI_BUS_REMOVAL_EJECT) {
855 if (acpi_processor_handle_eject(pr))
859 acpi_processor_power_exit(pr, device);
861 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
862 acpi_processor_notify);
864 sysfs_remove_link(&device->dev.kobj, "sysdev");
866 acpi_processor_remove_fs(device);
869 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
870 sysfs_remove_link(&pr->cdev->device.kobj, "device");
871 thermal_cooling_device_unregister(pr->cdev);
875 per_cpu(processors, pr->id) = NULL;
876 per_cpu(processor_device_array, pr->id) = NULL;
882 #ifdef CONFIG_ACPI_HOTPLUG_CPU
883 /****************************************************************************
884 * Acpi processor hotplug support *
885 ****************************************************************************/
887 static int is_processor_present(acpi_handle handle)
890 unsigned long long sta = 0;
893 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
895 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
899 * _STA is mandatory for a processor that supports hot plug
901 if (status == AE_NOT_FOUND)
902 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
903 "Processor does not support hot plug\n"));
905 ACPI_EXCEPTION((AE_INFO, status,
906 "Processor Device is not present"));
911 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
914 struct acpi_device *pdev;
915 struct acpi_processor *pr;
918 if (acpi_get_parent(handle, &phandle)) {
922 if (acpi_bus_get_device(phandle, &pdev)) {
926 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
930 acpi_bus_start(*device);
932 pr = acpi_driver_data(*device);
936 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
937 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
942 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
943 u32 event, void *data)
945 struct acpi_processor *pr;
946 struct acpi_device *device = NULL;
951 case ACPI_NOTIFY_BUS_CHECK:
952 case ACPI_NOTIFY_DEVICE_CHECK:
953 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
954 "Processor driver received %s event\n",
955 (event == ACPI_NOTIFY_BUS_CHECK) ?
956 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
958 if (!is_processor_present(handle))
961 if (acpi_bus_get_device(handle, &device)) {
962 result = acpi_processor_device_add(handle, &device);
964 printk(KERN_ERR PREFIX
965 "Unable to add the device\n");
969 pr = acpi_driver_data(device);
971 printk(KERN_ERR PREFIX "Driver data is NULL\n");
975 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
976 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
980 result = acpi_processor_start(device);
981 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
982 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
984 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
985 acpi_device_bid(device));
988 case ACPI_NOTIFY_EJECT_REQUEST:
989 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
990 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
992 if (acpi_bus_get_device(handle, &device)) {
993 printk(KERN_ERR PREFIX
994 "Device don't exist, dropping EJECT\n");
997 pr = acpi_driver_data(device);
999 printk(KERN_ERR PREFIX
1000 "Driver data is NULL, dropping EJECT\n");
1004 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
1005 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1008 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1009 "Unsupported event [0x%x]\n", event));
1017 processor_walk_namespace_cb(acpi_handle handle,
1018 u32 lvl, void *context, void **rv)
1021 int *action = context;
1022 acpi_object_type type = 0;
1024 status = acpi_get_type(handle, &type);
1025 if (ACPI_FAILURE(status))
1028 if (type != ACPI_TYPE_PROCESSOR)
1032 case INSTALL_NOTIFY_HANDLER:
1033 acpi_install_notify_handler(handle,
1035 acpi_processor_hotplug_notify,
1038 case UNINSTALL_NOTIFY_HANDLER:
1039 acpi_remove_notify_handler(handle,
1041 acpi_processor_hotplug_notify);
1050 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1053 if (!is_processor_present(handle)) {
1057 if (acpi_map_lsapic(handle, p_cpu))
1060 if (arch_register_cpu(*p_cpu)) {
1061 acpi_unmap_lsapic(*p_cpu);
1068 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1070 if (cpu_online(pr->id))
1073 arch_unregister_cpu(pr->id);
1074 acpi_unmap_lsapic(pr->id);
1078 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1082 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1089 void acpi_processor_install_hotplug_notify(void)
1091 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1092 int action = INSTALL_NOTIFY_HANDLER;
1093 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1096 processor_walk_namespace_cb, &action, NULL);
1098 register_hotcpu_notifier(&acpi_cpu_notifier);
1102 void acpi_processor_uninstall_hotplug_notify(void)
1104 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1105 int action = UNINSTALL_NOTIFY_HANDLER;
1106 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1109 processor_walk_namespace_cb, &action, NULL);
1111 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1115 * We keep the driver loaded even when ACPI is not running.
1116 * This is needed for the powernow-k8 driver, that works even without
1117 * ACPI, but needs symbols from this driver
1120 static int __init acpi_processor_init(void)
1124 memset(&errata, 0, sizeof(errata));
1127 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1128 (struct acpi_table_header **)&madt)))
1132 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1133 if (!acpi_processor_dir)
1135 acpi_processor_dir->owner = THIS_MODULE;
1138 * Check whether the system is DMI table. If yes, OSPM
1139 * should not use mwait for CPU-states.
1141 dmi_check_system(processor_idle_dmi_table);
1142 result = cpuidle_register_driver(&acpi_idle_driver);
1146 result = acpi_bus_register_driver(&acpi_processor_driver);
1150 acpi_processor_install_hotplug_notify();
1152 acpi_thermal_cpufreq_init();
1154 acpi_processor_ppc_init();
1156 acpi_processor_throttling_init();
1161 cpuidle_unregister_driver(&acpi_idle_driver);
1164 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1169 static void __exit acpi_processor_exit(void)
1171 acpi_processor_ppc_exit();
1173 acpi_thermal_cpufreq_exit();
1175 acpi_processor_uninstall_hotplug_notify();
1177 acpi_bus_unregister_driver(&acpi_processor_driver);
1179 cpuidle_unregister_driver(&acpi_idle_driver);
1181 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1186 module_init(acpi_processor_init);
1187 module_exit(acpi_processor_exit);
1189 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1191 MODULE_ALIAS("processor");