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 #ifdef CONFIG_ACPI_PROCFS
85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
87 static void acpi_processor_notify(struct acpi_device *device, u32 event);
88 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
89 static int acpi_processor_handle_eject(struct acpi_processor *pr);
92 static const struct acpi_device_id processor_device_ids[] = {
93 {ACPI_PROCESSOR_OBJECT_HID, 0},
94 {ACPI_PROCESSOR_HID, 0},
97 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
99 static struct acpi_driver acpi_processor_driver = {
101 .class = ACPI_PROCESSOR_CLASS,
102 .ids = processor_device_ids,
104 .add = acpi_processor_add,
105 .remove = acpi_processor_remove,
106 .start = acpi_processor_start,
107 .suspend = acpi_processor_suspend,
108 .resume = acpi_processor_resume,
109 .notify = acpi_processor_notify,
113 #define INSTALL_NOTIFY_HANDLER 1
114 #define UNINSTALL_NOTIFY_HANDLER 2
115 #ifdef CONFIG_ACPI_PROCFS
116 static const struct file_operations acpi_processor_info_fops = {
117 .owner = THIS_MODULE,
118 .open = acpi_processor_info_open_fs,
121 .release = single_release,
125 DEFINE_PER_CPU(struct acpi_processor *, processors);
126 struct acpi_processor_errata errata __read_mostly;
127 static int set_no_mwait(const struct dmi_system_id *id)
129 printk(KERN_NOTICE PREFIX "%s detected - "
130 "disabling mwait for CPU C-states\n", id->ident);
135 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
137 set_no_mwait, "IFL91 board", {
138 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
139 DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
140 DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
141 DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
143 set_no_mwait, "Extensa 5220", {
144 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
145 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
146 DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
147 DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
151 /* --------------------------------------------------------------------------
153 -------------------------------------------------------------------------- */
155 static int acpi_processor_errata_piix4(struct pci_dev *dev)
165 * Note that 'dev' references the PIIX4 ACPI Controller.
168 switch (dev->revision) {
170 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
173 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
176 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
179 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
182 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
186 switch (dev->revision) {
188 case 0: /* PIIX4 A-step */
189 case 1: /* PIIX4 B-step */
191 * See specification changes #13 ("Manual Throttle Duty Cycle")
192 * and #14 ("Enabling and Disabling Manual Throttle"), plus
193 * erratum #5 ("STPCLK# Deassertion Time") from the January
194 * 2002 PIIX4 specification update. Applies to only older
197 errata.piix4.throttle = 1;
202 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
203 * Livelock") from the January 2002 PIIX4 specification update.
204 * Applies to all PIIX4 models.
210 * Find the PIIX4 IDE Controller and get the Bus Master IDE
211 * Status register address. We'll use this later to read
212 * each IDE controller's DMA status to make sure we catch all
215 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
216 PCI_DEVICE_ID_INTEL_82371AB,
217 PCI_ANY_ID, PCI_ANY_ID, NULL);
219 errata.piix4.bmisx = pci_resource_start(dev, 4);
226 * Find the PIIX4 ISA Controller and read the Motherboard
227 * DMA controller's status to see if Type-F (Fast) DMA mode
228 * is enabled (bit 7) on either channel. Note that we'll
229 * disable C3 support if this is enabled, as some legacy
230 * devices won't operate well if fast DMA is disabled.
232 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
233 PCI_DEVICE_ID_INTEL_82371AB_0,
234 PCI_ANY_ID, PCI_ANY_ID, NULL);
236 pci_read_config_byte(dev, 0x76, &value1);
237 pci_read_config_byte(dev, 0x77, &value2);
238 if ((value1 & 0x80) || (value2 & 0x80))
239 errata.piix4.fdma = 1;
246 if (errata.piix4.bmisx)
247 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
248 "Bus master activity detection (BM-IDE) erratum enabled\n"));
249 if (errata.piix4.fdma)
250 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
251 "Type-F DMA livelock erratum (C3 disabled)\n"));
256 static int acpi_processor_errata(struct acpi_processor *pr)
259 struct pci_dev *dev = NULL;
268 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
269 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
272 result = acpi_processor_errata_piix4(dev);
279 /* --------------------------------------------------------------------------
280 Common ACPI processor functions
281 -------------------------------------------------------------------------- */
284 * _PDC is required for a BIOS-OS handshake for most of the newer
285 * ACPI processor features.
287 static int acpi_processor_set_pdc(struct acpi_processor *pr)
289 struct acpi_object_list *pdc_in = pr->pdc;
290 acpi_status status = AE_OK;
297 * If mwait is disabled for CPU C-states, the C2C3_FFH access
298 * mode will be disabled in the parameter of _PDC object.
299 * Of course C1_FFH access mode will also be disabled.
301 union acpi_object *obj;
304 obj = pdc_in->pointer;
305 buffer = (u32 *)(obj->buffer.pointer);
306 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
309 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
311 if (ACPI_FAILURE(status))
312 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
313 "Could not evaluate _PDC, using legacy perf. control...\n"));
318 /* --------------------------------------------------------------------------
320 -------------------------------------------------------------------------- */
322 #ifdef CONFIG_ACPI_PROCFS
323 static struct proc_dir_entry *acpi_processor_dir = NULL;
325 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
327 struct acpi_processor *pr = seq->private;
333 seq_printf(seq, "processor id: %d\n"
335 "bus mastering control: %s\n"
336 "power management: %s\n"
337 "throttling control: %s\n"
338 "limit interface: %s\n",
341 pr->flags.bm_control ? "yes" : "no",
342 pr->flags.power ? "yes" : "no",
343 pr->flags.throttling ? "yes" : "no",
344 pr->flags.limit ? "yes" : "no");
350 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
352 return single_open(file, acpi_processor_info_seq_show,
356 static int acpi_processor_add_fs(struct acpi_device *device)
358 struct proc_dir_entry *entry = NULL;
361 if (!acpi_device_dir(device)) {
362 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
364 if (!acpi_device_dir(device))
369 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
370 S_IRUGO, acpi_device_dir(device),
371 &acpi_processor_info_fops,
372 acpi_driver_data(device));
376 /* 'throttling' [R/W] */
377 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
378 S_IFREG | S_IRUGO | S_IWUSR,
379 acpi_device_dir(device),
380 &acpi_processor_throttling_fops,
381 acpi_driver_data(device));
386 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
387 S_IFREG | S_IRUGO | S_IWUSR,
388 acpi_device_dir(device),
389 &acpi_processor_limit_fops,
390 acpi_driver_data(device));
395 static int acpi_processor_remove_fs(struct acpi_device *device)
398 if (acpi_device_dir(device)) {
399 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
400 acpi_device_dir(device));
401 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
402 acpi_device_dir(device));
403 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
404 acpi_device_dir(device));
405 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
406 acpi_device_dir(device) = NULL;
412 static inline int acpi_processor_add_fs(struct acpi_device *device)
416 static inline int acpi_processor_remove_fs(struct acpi_device *device)
422 /* Use the acpiid in MADT to map cpus in case of SMP */
425 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
428 static struct acpi_table_madt *madt;
430 static int map_lapic_id(struct acpi_subtable_header *entry,
431 u32 acpi_id, int *apic_id)
433 struct acpi_madt_local_apic *lapic =
434 (struct acpi_madt_local_apic *)entry;
435 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
436 lapic->processor_id == acpi_id) {
437 *apic_id = lapic->id;
443 static int map_x2apic_id(struct acpi_subtable_header *entry,
444 int device_declaration, u32 acpi_id, int *apic_id)
446 struct acpi_madt_local_x2apic *apic =
447 (struct acpi_madt_local_x2apic *)entry;
448 u32 tmp = apic->local_apic_id;
450 /* Only check enabled APICs*/
451 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
454 /* Device statement declaration type */
455 if (device_declaration) {
456 if (apic->uid == acpi_id)
466 static int map_lsapic_id(struct acpi_subtable_header *entry,
467 int device_declaration, u32 acpi_id, int *apic_id)
469 struct acpi_madt_local_sapic *lsapic =
470 (struct acpi_madt_local_sapic *)entry;
471 u32 tmp = (lsapic->id << 8) | lsapic->eid;
473 /* Only check enabled APICs*/
474 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
477 /* Device statement declaration type */
478 if (device_declaration) {
479 if (entry->length < 16)
480 printk(KERN_ERR PREFIX
481 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
483 else if (lsapic->uid == acpi_id)
485 /* Processor statement declaration type */
486 } else if (lsapic->processor_id == acpi_id)
495 static int map_madt_entry(int type, u32 acpi_id)
497 unsigned long madt_end, entry;
503 entry = (unsigned long)madt;
504 madt_end = entry + madt->header.length;
506 /* Parse all entries looking for a match. */
508 entry += sizeof(struct acpi_table_madt);
509 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
510 struct acpi_subtable_header *header =
511 (struct acpi_subtable_header *)entry;
512 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
513 if (map_lapic_id(header, acpi_id, &apic_id))
515 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
516 if (map_x2apic_id(header, type, acpi_id, &apic_id))
518 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
519 if (map_lsapic_id(header, type, acpi_id, &apic_id))
522 entry += header->length;
527 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
529 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
530 union acpi_object *obj;
531 struct acpi_subtable_header *header;
534 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
537 if (!buffer.length || !buffer.pointer)
540 obj = buffer.pointer;
541 if (obj->type != ACPI_TYPE_BUFFER ||
542 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
546 header = (struct acpi_subtable_header *)obj->buffer.pointer;
547 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
548 map_lapic_id(header, acpi_id, &apic_id);
549 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
550 map_lsapic_id(header, type, acpi_id, &apic_id);
555 kfree(buffer.pointer);
559 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
564 apic_id = map_mat_entry(handle, type, acpi_id);
566 apic_id = map_madt_entry(type, acpi_id);
570 for_each_possible_cpu(i) {
571 if (cpu_physical_id(i) == apic_id)
578 /* --------------------------------------------------------------------------
580 -------------------------------------------------------------------------- */
582 static int acpi_processor_get_info(struct acpi_device *device)
584 acpi_status status = 0;
585 union acpi_object object = { 0 };
586 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
587 struct acpi_processor *pr;
588 int cpu_index, device_declaration = 0;
589 static int cpu0_initialized;
591 pr = acpi_driver_data(device);
595 if (num_online_cpus() > 1)
598 acpi_processor_errata(pr);
601 * Check to see if we have bus mastering arbitration control. This
602 * is required for proper C3 usage (to maintain cache coherency).
604 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
605 pr->flags.bm_control = 1;
606 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
607 "Bus mastering arbitration control present\n"));
609 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
610 "No bus mastering arbitration control\n"));
612 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) {
614 * Declared with "Device" statement; match _UID.
615 * Note that we don't handle string _UIDs yet.
617 unsigned long long value;
618 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
620 if (ACPI_FAILURE(status)) {
621 printk(KERN_ERR PREFIX
622 "Evaluating processor _UID [%#x]\n", status);
625 device_declaration = 1;
628 /* Declared with "Processor" statement; match ProcessorID */
629 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
630 if (ACPI_FAILURE(status)) {
631 printk(KERN_ERR PREFIX "Evaluating processor object\n");
636 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
637 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
640 pr->acpi_id = object.processor.proc_id;
642 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
644 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
645 if (!cpu0_initialized && (cpu_index == -1) &&
646 (num_online_cpus() == 1)) {
650 cpu0_initialized = 1;
655 * Extra Processor objects may be enumerated on MP systems with
656 * less than the max # of CPUs. They should be ignored _iff
657 * they are physically not present.
661 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
666 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
669 if (!object.processor.pblk_address)
670 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
671 else if (object.processor.pblk_length != 6)
672 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
673 object.processor.pblk_length);
675 pr->throttling.address = object.processor.pblk_address;
676 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
677 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
679 pr->pblk = object.processor.pblk_address;
682 * We don't care about error returns - we just try to mark
683 * these reserved so that nobody else is confused into thinking
684 * that this region might be unused..
686 * (In particular, allocating the IO range for Cardbus)
688 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
692 * If ACPI describes a slot number for this CPU, we can use it
693 * ensure we get the right value in the "physical id" field
696 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
697 if (ACPI_SUCCESS(status))
698 arch_fix_phys_package_id(pr->id, object.integer.value);
703 static DEFINE_PER_CPU(void *, processor_device_array);
705 static int __cpuinit acpi_processor_start(struct acpi_device *device)
708 struct acpi_processor *pr;
709 struct sys_device *sysdev;
711 pr = acpi_driver_data(device);
713 result = acpi_processor_get_info(device);
715 /* Processor is physically not present */
719 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
723 * ACPI id of processors can be reported wrongly by the BIOS.
724 * Don't trust it blindly
726 if (per_cpu(processor_device_array, pr->id) != NULL &&
727 per_cpu(processor_device_array, pr->id) != device) {
728 printk(KERN_WARNING "BIOS reported wrong ACPI id "
729 "for the processor\n");
732 per_cpu(processor_device_array, pr->id) = device;
734 per_cpu(processors, pr->id) = pr;
736 result = acpi_processor_add_fs(device);
740 sysdev = get_cpu_sysdev(pr->id);
741 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
744 /* _PDC call should be done before doing anything else (if reqd.). */
745 arch_acpi_processor_init_pdc(pr);
746 acpi_processor_set_pdc(pr);
747 #ifdef CONFIG_CPU_FREQ
748 acpi_processor_ppc_has_changed(pr);
750 acpi_processor_get_throttling_info(pr);
751 acpi_processor_get_limit_info(pr);
754 acpi_processor_power_init(pr, device);
756 pr->cdev = thermal_cooling_device_register("Processor", device,
757 &processor_cooling_ops);
758 if (IS_ERR(pr->cdev)) {
759 result = PTR_ERR(pr->cdev);
763 dev_info(&device->dev, "registered as cooling_device%d\n",
766 result = sysfs_create_link(&device->dev.kobj,
767 &pr->cdev->device.kobj,
770 printk(KERN_ERR PREFIX "Create sysfs link\n");
771 result = sysfs_create_link(&pr->cdev->device.kobj,
775 printk(KERN_ERR PREFIX "Create sysfs link\n");
777 if (pr->flags.throttling) {
778 printk(KERN_INFO PREFIX "%s [%s] (supports",
779 acpi_device_name(device), acpi_device_bid(device));
780 printk(" %d throttling states", pr->throttling.state_count);
789 static void acpi_processor_notify(struct acpi_device *device, u32 event)
791 struct acpi_processor *pr = acpi_driver_data(device);
798 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
799 saved = pr->performance_platform_limit;
800 acpi_processor_ppc_has_changed(pr);
801 if (saved == pr->performance_platform_limit)
803 acpi_bus_generate_proc_event(device, event,
804 pr->performance_platform_limit);
805 acpi_bus_generate_netlink_event(device->pnp.device_class,
806 dev_name(&device->dev), event,
807 pr->performance_platform_limit);
809 case ACPI_PROCESSOR_NOTIFY_POWER:
810 acpi_processor_cst_has_changed(pr);
811 acpi_bus_generate_proc_event(device, event, 0);
812 acpi_bus_generate_netlink_event(device->pnp.device_class,
813 dev_name(&device->dev), event, 0);
815 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
816 acpi_processor_tstate_has_changed(pr);
817 acpi_bus_generate_proc_event(device, event, 0);
818 acpi_bus_generate_netlink_event(device->pnp.device_class,
819 dev_name(&device->dev), event, 0);
821 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
822 "Unsupported event [0x%x]\n", event));
829 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
830 unsigned long action, void *hcpu)
832 unsigned int cpu = (unsigned long)hcpu;
833 struct acpi_processor *pr = per_cpu(processors, cpu);
835 if (action == CPU_ONLINE && pr) {
836 acpi_processor_ppc_has_changed(pr);
837 acpi_processor_cst_has_changed(pr);
838 acpi_processor_tstate_has_changed(pr);
843 static struct notifier_block acpi_cpu_notifier =
845 .notifier_call = acpi_cpu_soft_notify,
848 static int acpi_processor_add(struct acpi_device *device)
850 struct acpi_processor *pr = NULL;
856 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
860 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
865 pr->handle = device->handle;
866 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
867 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
868 device->driver_data = pr;
873 static int acpi_processor_remove(struct acpi_device *device, int type)
875 struct acpi_processor *pr = NULL;
878 if (!device || !acpi_driver_data(device))
881 pr = acpi_driver_data(device);
883 if (pr->id >= nr_cpu_ids)
886 if (type == ACPI_BUS_REMOVAL_EJECT) {
887 if (acpi_processor_handle_eject(pr))
891 acpi_processor_power_exit(pr, device);
893 sysfs_remove_link(&device->dev.kobj, "sysdev");
895 acpi_processor_remove_fs(device);
898 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
899 sysfs_remove_link(&pr->cdev->device.kobj, "device");
900 thermal_cooling_device_unregister(pr->cdev);
904 per_cpu(processors, pr->id) = NULL;
905 per_cpu(processor_device_array, pr->id) = NULL;
908 free_cpumask_var(pr->throttling.shared_cpu_map);
914 #ifdef CONFIG_ACPI_HOTPLUG_CPU
915 /****************************************************************************
916 * Acpi processor hotplug support *
917 ****************************************************************************/
919 static int is_processor_present(acpi_handle handle)
922 unsigned long long sta = 0;
925 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
927 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
931 * _STA is mandatory for a processor that supports hot plug
933 if (status == AE_NOT_FOUND)
934 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
935 "Processor does not support hot plug\n"));
937 ACPI_EXCEPTION((AE_INFO, status,
938 "Processor Device is not present"));
943 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
946 struct acpi_device *pdev;
947 struct acpi_processor *pr;
950 if (acpi_get_parent(handle, &phandle)) {
954 if (acpi_bus_get_device(phandle, &pdev)) {
958 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
962 acpi_bus_start(*device);
964 pr = acpi_driver_data(*device);
968 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
969 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
974 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
975 u32 event, void *data)
977 struct acpi_processor *pr;
978 struct acpi_device *device = NULL;
983 case ACPI_NOTIFY_BUS_CHECK:
984 case ACPI_NOTIFY_DEVICE_CHECK:
985 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
986 "Processor driver received %s event\n",
987 (event == ACPI_NOTIFY_BUS_CHECK) ?
988 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
990 if (!is_processor_present(handle))
993 if (acpi_bus_get_device(handle, &device)) {
994 result = acpi_processor_device_add(handle, &device);
996 printk(KERN_ERR PREFIX
997 "Unable to add the device\n");
1001 pr = acpi_driver_data(device);
1003 printk(KERN_ERR PREFIX "Driver data is NULL\n");
1007 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
1008 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1012 result = acpi_processor_start(device);
1013 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
1014 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
1016 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
1017 acpi_device_bid(device));
1020 case ACPI_NOTIFY_EJECT_REQUEST:
1021 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1022 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
1024 if (acpi_bus_get_device(handle, &device)) {
1025 printk(KERN_ERR PREFIX
1026 "Device don't exist, dropping EJECT\n");
1029 pr = acpi_driver_data(device);
1031 printk(KERN_ERR PREFIX
1032 "Driver data is NULL, dropping EJECT\n");
1036 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
1037 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1040 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1041 "Unsupported event [0x%x]\n", event));
1049 processor_walk_namespace_cb(acpi_handle handle,
1050 u32 lvl, void *context, void **rv)
1053 int *action = context;
1054 acpi_object_type type = 0;
1056 status = acpi_get_type(handle, &type);
1057 if (ACPI_FAILURE(status))
1060 if (type != ACPI_TYPE_PROCESSOR)
1064 case INSTALL_NOTIFY_HANDLER:
1065 acpi_install_notify_handler(handle,
1067 acpi_processor_hotplug_notify,
1070 case UNINSTALL_NOTIFY_HANDLER:
1071 acpi_remove_notify_handler(handle,
1073 acpi_processor_hotplug_notify);
1082 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1085 if (!is_processor_present(handle)) {
1089 if (acpi_map_lsapic(handle, p_cpu))
1092 if (arch_register_cpu(*p_cpu)) {
1093 acpi_unmap_lsapic(*p_cpu);
1100 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1102 if (cpu_online(pr->id))
1105 arch_unregister_cpu(pr->id);
1106 acpi_unmap_lsapic(pr->id);
1110 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1114 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1121 void acpi_processor_install_hotplug_notify(void)
1123 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1124 int action = INSTALL_NOTIFY_HANDLER;
1125 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1128 processor_walk_namespace_cb, &action, NULL);
1130 register_hotcpu_notifier(&acpi_cpu_notifier);
1134 void acpi_processor_uninstall_hotplug_notify(void)
1136 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1137 int action = UNINSTALL_NOTIFY_HANDLER;
1138 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1141 processor_walk_namespace_cb, &action, NULL);
1143 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1147 * We keep the driver loaded even when ACPI is not running.
1148 * This is needed for the powernow-k8 driver, that works even without
1149 * ACPI, but needs symbols from this driver
1152 static int __init acpi_processor_init(void)
1156 memset(&errata, 0, sizeof(errata));
1159 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1160 (struct acpi_table_header **)&madt)))
1163 #ifdef CONFIG_ACPI_PROCFS
1164 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1165 if (!acpi_processor_dir)
1169 * Check whether the system is DMI table. If yes, OSPM
1170 * should not use mwait for CPU-states.
1172 dmi_check_system(processor_idle_dmi_table);
1173 result = cpuidle_register_driver(&acpi_idle_driver);
1177 result = acpi_bus_register_driver(&acpi_processor_driver);
1181 acpi_processor_install_hotplug_notify();
1183 acpi_thermal_cpufreq_init();
1185 acpi_processor_ppc_init();
1187 acpi_processor_throttling_init();
1192 cpuidle_unregister_driver(&acpi_idle_driver);
1195 #ifdef CONFIG_ACPI_PROCFS
1196 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1202 static void __exit acpi_processor_exit(void)
1204 acpi_processor_ppc_exit();
1206 acpi_thermal_cpufreq_exit();
1208 acpi_processor_uninstall_hotplug_notify();
1210 acpi_bus_unregister_driver(&acpi_processor_driver);
1212 cpuidle_unregister_driver(&acpi_idle_driver);
1214 #ifdef CONFIG_ACPI_PROCFS
1215 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1221 module_init(acpi_processor_init);
1222 module_exit(acpi_processor_exit);
1224 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1226 MODULE_ALIAS("processor");