Linux 2.6.34-rc3
[pohmelfs.git] / drivers / acpi / processor_driver.c
blobb5658cdce27fec45f4d718e924af3229308249e0
1 /*
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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 * TBD:
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>
40 #include <linux/pm.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>
49 #include <asm/io.h>
50 #include <asm/system.h>
51 #include <asm/cpu.h>
52 #include <asm/delay.h>
53 #include <asm/uaccess.h>
54 #include <asm/processor.h>
55 #include <asm/smp.h>
56 #include <asm/acpi.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_driver");
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);
87 #endif
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},
95 {"ACPI0007", 0},
96 {"", 0},
98 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
100 static struct acpi_driver acpi_processor_driver = {
101 .name = "processor",
102 .class = ACPI_PROCESSOR_CLASS,
103 .ids = processor_device_ids,
104 .ops = {
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,
119 .read = seq_read,
120 .llseek = seq_lseek,
121 .release = single_release,
123 #endif
125 DEFINE_PER_CPU(struct acpi_processor *, processors);
126 EXPORT_PER_CPU_SYMBOL(processors);
128 struct acpi_processor_errata errata __read_mostly;
130 /* --------------------------------------------------------------------------
131 Errata Handling
132 -------------------------------------------------------------------------- */
134 static int acpi_processor_errata_piix4(struct pci_dev *dev)
136 u8 value1 = 0;
137 u8 value2 = 0;
140 if (!dev)
141 return -EINVAL;
144 * Note that 'dev' references the PIIX4 ACPI Controller.
147 switch (dev->revision) {
148 case 0:
149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
150 break;
151 case 1:
152 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
153 break;
154 case 2:
155 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
156 break;
157 case 3:
158 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
159 break;
160 default:
161 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
162 break;
165 switch (dev->revision) {
167 case 0: /* PIIX4 A-step */
168 case 1: /* PIIX4 B-step */
170 * See specification changes #13 ("Manual Throttle Duty Cycle")
171 * and #14 ("Enabling and Disabling Manual Throttle"), plus
172 * erratum #5 ("STPCLK# Deassertion Time") from the January
173 * 2002 PIIX4 specification update. Applies to only older
174 * PIIX4 models.
176 errata.piix4.throttle = 1;
178 case 2: /* PIIX4E */
179 case 3: /* PIIX4M */
181 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
182 * Livelock") from the January 2002 PIIX4 specification update.
183 * Applies to all PIIX4 models.
187 * BM-IDE
188 * ------
189 * Find the PIIX4 IDE Controller and get the Bus Master IDE
190 * Status register address. We'll use this later to read
191 * each IDE controller's DMA status to make sure we catch all
192 * DMA activity.
194 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
195 PCI_DEVICE_ID_INTEL_82371AB,
196 PCI_ANY_ID, PCI_ANY_ID, NULL);
197 if (dev) {
198 errata.piix4.bmisx = pci_resource_start(dev, 4);
199 pci_dev_put(dev);
203 * Type-F DMA
204 * ----------
205 * Find the PIIX4 ISA Controller and read the Motherboard
206 * DMA controller's status to see if Type-F (Fast) DMA mode
207 * is enabled (bit 7) on either channel. Note that we'll
208 * disable C3 support if this is enabled, as some legacy
209 * devices won't operate well if fast DMA is disabled.
211 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
212 PCI_DEVICE_ID_INTEL_82371AB_0,
213 PCI_ANY_ID, PCI_ANY_ID, NULL);
214 if (dev) {
215 pci_read_config_byte(dev, 0x76, &value1);
216 pci_read_config_byte(dev, 0x77, &value2);
217 if ((value1 & 0x80) || (value2 & 0x80))
218 errata.piix4.fdma = 1;
219 pci_dev_put(dev);
222 break;
225 if (errata.piix4.bmisx)
226 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
227 "Bus master activity detection (BM-IDE) erratum enabled\n"));
228 if (errata.piix4.fdma)
229 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
230 "Type-F DMA livelock erratum (C3 disabled)\n"));
232 return 0;
235 static int acpi_processor_errata(struct acpi_processor *pr)
237 int result = 0;
238 struct pci_dev *dev = NULL;
241 if (!pr)
242 return -EINVAL;
245 * PIIX4
247 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
248 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
249 PCI_ANY_ID, NULL);
250 if (dev) {
251 result = acpi_processor_errata_piix4(dev);
252 pci_dev_put(dev);
255 return result;
258 /* --------------------------------------------------------------------------
259 FS Interface (/proc)
260 -------------------------------------------------------------------------- */
262 #ifdef CONFIG_ACPI_PROCFS
263 static struct proc_dir_entry *acpi_processor_dir = NULL;
265 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
267 struct acpi_processor *pr = seq->private;
270 if (!pr)
271 goto end;
273 seq_printf(seq, "processor id: %d\n"
274 "acpi id: %d\n"
275 "bus mastering control: %s\n"
276 "power management: %s\n"
277 "throttling control: %s\n"
278 "limit interface: %s\n",
279 pr->id,
280 pr->acpi_id,
281 pr->flags.bm_control ? "yes" : "no",
282 pr->flags.power ? "yes" : "no",
283 pr->flags.throttling ? "yes" : "no",
284 pr->flags.limit ? "yes" : "no");
286 end:
287 return 0;
290 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
292 return single_open(file, acpi_processor_info_seq_show,
293 PDE(inode)->data);
296 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
298 struct proc_dir_entry *entry = NULL;
301 if (!acpi_device_dir(device)) {
302 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
303 acpi_processor_dir);
304 if (!acpi_device_dir(device))
305 return -ENODEV;
308 /* 'info' [R] */
309 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
310 S_IRUGO, acpi_device_dir(device),
311 &acpi_processor_info_fops,
312 acpi_driver_data(device));
313 if (!entry)
314 return -EIO;
316 /* 'throttling' [R/W] */
317 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
318 S_IFREG | S_IRUGO | S_IWUSR,
319 acpi_device_dir(device),
320 &acpi_processor_throttling_fops,
321 acpi_driver_data(device));
322 if (!entry)
323 return -EIO;
325 /* 'limit' [R/W] */
326 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
327 S_IFREG | S_IRUGO | S_IWUSR,
328 acpi_device_dir(device),
329 &acpi_processor_limit_fops,
330 acpi_driver_data(device));
331 if (!entry)
332 return -EIO;
333 return 0;
335 static int acpi_processor_remove_fs(struct acpi_device *device)
338 if (acpi_device_dir(device)) {
339 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
340 acpi_device_dir(device));
341 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
342 acpi_device_dir(device));
343 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
344 acpi_device_dir(device));
345 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
346 acpi_device_dir(device) = NULL;
349 return 0;
351 #else
352 static inline int acpi_processor_add_fs(struct acpi_device *device)
354 return 0;
356 static inline int acpi_processor_remove_fs(struct acpi_device *device)
358 return 0;
360 #endif
362 /* --------------------------------------------------------------------------
363 Driver Interface
364 -------------------------------------------------------------------------- */
366 static int acpi_processor_get_info(struct acpi_device *device)
368 acpi_status status = 0;
369 union acpi_object object = { 0 };
370 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
371 struct acpi_processor *pr;
372 int cpu_index, device_declaration = 0;
373 static int cpu0_initialized;
375 pr = acpi_driver_data(device);
376 if (!pr)
377 return -EINVAL;
379 if (num_online_cpus() > 1)
380 errata.smp = TRUE;
382 acpi_processor_errata(pr);
385 * Check to see if we have bus mastering arbitration control. This
386 * is required for proper C3 usage (to maintain cache coherency).
388 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
389 pr->flags.bm_control = 1;
390 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
391 "Bus mastering arbitration control present\n"));
392 } else
393 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
394 "No bus mastering arbitration control\n"));
396 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
397 /* Declared with "Processor" statement; match ProcessorID */
398 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
399 if (ACPI_FAILURE(status)) {
400 printk(KERN_ERR PREFIX "Evaluating processor object\n");
401 return -ENODEV;
405 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
406 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
407 * arch/xxx/acpi.c
409 pr->acpi_id = object.processor.proc_id;
410 } else {
412 * Declared with "Device" statement; match _UID.
413 * Note that we don't handle string _UIDs yet.
415 unsigned long long value;
416 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
417 NULL, &value);
418 if (ACPI_FAILURE(status)) {
419 printk(KERN_ERR PREFIX
420 "Evaluating processor _UID [%#x]\n", status);
421 return -ENODEV;
423 device_declaration = 1;
424 pr->acpi_id = value;
426 cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
428 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
429 if (!cpu0_initialized && (cpu_index == -1) &&
430 (num_online_cpus() == 1)) {
431 cpu_index = 0;
434 cpu0_initialized = 1;
436 pr->id = cpu_index;
439 * Extra Processor objects may be enumerated on MP systems with
440 * less than the max # of CPUs. They should be ignored _iff
441 * they are physically not present.
443 if (pr->id == -1) {
444 if (ACPI_FAILURE
445 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
446 return -ENODEV;
450 * On some boxes several processors use the same processor bus id.
451 * But they are located in different scope. For example:
452 * \_SB.SCK0.CPU0
453 * \_SB.SCK1.CPU0
454 * Rename the processor device bus id. And the new bus id will be
455 * generated as the following format:
456 * CPU+CPU ID.
458 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
459 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
460 pr->acpi_id));
462 if (!object.processor.pblk_address)
463 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
464 else if (object.processor.pblk_length != 6)
465 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
466 object.processor.pblk_length);
467 else {
468 pr->throttling.address = object.processor.pblk_address;
469 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
470 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
472 pr->pblk = object.processor.pblk_address;
475 * We don't care about error returns - we just try to mark
476 * these reserved so that nobody else is confused into thinking
477 * that this region might be unused..
479 * (In particular, allocating the IO range for Cardbus)
481 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
485 * If ACPI describes a slot number for this CPU, we can use it
486 * ensure we get the right value in the "physical id" field
487 * of /proc/cpuinfo
489 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
490 if (ACPI_SUCCESS(status))
491 arch_fix_phys_package_id(pr->id, object.integer.value);
493 return 0;
496 static DEFINE_PER_CPU(void *, processor_device_array);
498 static void acpi_processor_notify(struct acpi_device *device, u32 event)
500 struct acpi_processor *pr = acpi_driver_data(device);
501 int saved;
503 if (!pr)
504 return;
506 switch (event) {
507 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
508 saved = pr->performance_platform_limit;
509 acpi_processor_ppc_has_changed(pr, 1);
510 if (saved == pr->performance_platform_limit)
511 break;
512 acpi_bus_generate_proc_event(device, event,
513 pr->performance_platform_limit);
514 acpi_bus_generate_netlink_event(device->pnp.device_class,
515 dev_name(&device->dev), event,
516 pr->performance_platform_limit);
517 break;
518 case ACPI_PROCESSOR_NOTIFY_POWER:
519 acpi_processor_cst_has_changed(pr);
520 acpi_bus_generate_proc_event(device, event, 0);
521 acpi_bus_generate_netlink_event(device->pnp.device_class,
522 dev_name(&device->dev), event, 0);
523 break;
524 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
525 acpi_processor_tstate_has_changed(pr);
526 acpi_bus_generate_proc_event(device, event, 0);
527 acpi_bus_generate_netlink_event(device->pnp.device_class,
528 dev_name(&device->dev), event, 0);
529 default:
530 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
531 "Unsupported event [0x%x]\n", event));
532 break;
535 return;
538 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
539 unsigned long action, void *hcpu)
541 unsigned int cpu = (unsigned long)hcpu;
542 struct acpi_processor *pr = per_cpu(processors, cpu);
544 if (action == CPU_ONLINE && pr) {
545 acpi_processor_ppc_has_changed(pr, 0);
546 acpi_processor_cst_has_changed(pr);
547 acpi_processor_tstate_has_changed(pr);
549 return NOTIFY_OK;
552 static struct notifier_block acpi_cpu_notifier =
554 .notifier_call = acpi_cpu_soft_notify,
557 static int __cpuinit acpi_processor_add(struct acpi_device *device)
559 struct acpi_processor *pr = NULL;
560 int result = 0;
561 struct sys_device *sysdev;
563 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
564 if (!pr)
565 return -ENOMEM;
567 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
568 kfree(pr);
569 return -ENOMEM;
572 pr->handle = device->handle;
573 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
574 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
575 device->driver_data = pr;
577 result = acpi_processor_get_info(device);
578 if (result) {
579 /* Processor is physically not present */
580 return 0;
583 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
586 * Buggy BIOS check
587 * ACPI id of processors can be reported wrongly by the BIOS.
588 * Don't trust it blindly
590 if (per_cpu(processor_device_array, pr->id) != NULL &&
591 per_cpu(processor_device_array, pr->id) != device) {
592 printk(KERN_WARNING "BIOS reported wrong ACPI id "
593 "for the processor\n");
594 result = -ENODEV;
595 goto err_free_cpumask;
597 per_cpu(processor_device_array, pr->id) = device;
599 per_cpu(processors, pr->id) = pr;
601 result = acpi_processor_add_fs(device);
602 if (result)
603 goto err_free_cpumask;
605 sysdev = get_cpu_sysdev(pr->id);
606 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
607 result = -EFAULT;
608 goto err_remove_fs;
611 #ifdef CONFIG_CPU_FREQ
612 acpi_processor_ppc_has_changed(pr, 0);
613 #endif
614 acpi_processor_get_throttling_info(pr);
615 acpi_processor_get_limit_info(pr);
618 acpi_processor_power_init(pr, device);
620 pr->cdev = thermal_cooling_device_register("Processor", device,
621 &processor_cooling_ops);
622 if (IS_ERR(pr->cdev)) {
623 result = PTR_ERR(pr->cdev);
624 goto err_power_exit;
627 dev_dbg(&device->dev, "registered as cooling_device%d\n",
628 pr->cdev->id);
630 result = sysfs_create_link(&device->dev.kobj,
631 &pr->cdev->device.kobj,
632 "thermal_cooling");
633 if (result) {
634 printk(KERN_ERR PREFIX "Create sysfs link\n");
635 goto err_thermal_unregister;
637 result = sysfs_create_link(&pr->cdev->device.kobj,
638 &device->dev.kobj,
639 "device");
640 if (result) {
641 printk(KERN_ERR PREFIX "Create sysfs link\n");
642 goto err_remove_sysfs;
645 return 0;
647 err_remove_sysfs:
648 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
649 err_thermal_unregister:
650 thermal_cooling_device_unregister(pr->cdev);
651 err_power_exit:
652 acpi_processor_power_exit(pr, device);
653 err_remove_fs:
654 acpi_processor_remove_fs(device);
655 err_free_cpumask:
656 free_cpumask_var(pr->throttling.shared_cpu_map);
658 return result;
661 static int acpi_processor_remove(struct acpi_device *device, int type)
663 struct acpi_processor *pr = NULL;
666 if (!device || !acpi_driver_data(device))
667 return -EINVAL;
669 pr = acpi_driver_data(device);
671 if (pr->id >= nr_cpu_ids)
672 goto free;
674 if (type == ACPI_BUS_REMOVAL_EJECT) {
675 if (acpi_processor_handle_eject(pr))
676 return -EINVAL;
679 acpi_processor_power_exit(pr, device);
681 sysfs_remove_link(&device->dev.kobj, "sysdev");
683 acpi_processor_remove_fs(device);
685 if (pr->cdev) {
686 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
687 sysfs_remove_link(&pr->cdev->device.kobj, "device");
688 thermal_cooling_device_unregister(pr->cdev);
689 pr->cdev = NULL;
692 per_cpu(processors, pr->id) = NULL;
693 per_cpu(processor_device_array, pr->id) = NULL;
695 free:
696 free_cpumask_var(pr->throttling.shared_cpu_map);
697 kfree(pr);
699 return 0;
702 #ifdef CONFIG_ACPI_HOTPLUG_CPU
703 /****************************************************************************
704 * Acpi processor hotplug support *
705 ****************************************************************************/
707 static int is_processor_present(acpi_handle handle)
709 acpi_status status;
710 unsigned long long sta = 0;
713 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
715 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
716 return 1;
719 * _STA is mandatory for a processor that supports hot plug
721 if (status == AE_NOT_FOUND)
722 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
723 "Processor does not support hot plug\n"));
724 else
725 ACPI_EXCEPTION((AE_INFO, status,
726 "Processor Device is not present"));
727 return 0;
730 static
731 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
733 acpi_handle phandle;
734 struct acpi_device *pdev;
737 if (acpi_get_parent(handle, &phandle)) {
738 return -ENODEV;
741 if (acpi_bus_get_device(phandle, &pdev)) {
742 return -ENODEV;
745 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
746 return -ENODEV;
749 return 0;
752 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
753 u32 event, void *data)
755 struct acpi_processor *pr;
756 struct acpi_device *device = NULL;
757 int result;
760 switch (event) {
761 case ACPI_NOTIFY_BUS_CHECK:
762 case ACPI_NOTIFY_DEVICE_CHECK:
763 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
764 "Processor driver received %s event\n",
765 (event == ACPI_NOTIFY_BUS_CHECK) ?
766 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
768 if (!is_processor_present(handle))
769 break;
771 if (acpi_bus_get_device(handle, &device)) {
772 result = acpi_processor_device_add(handle, &device);
773 if (result)
774 printk(KERN_ERR PREFIX
775 "Unable to add the device\n");
776 break;
778 break;
779 case ACPI_NOTIFY_EJECT_REQUEST:
780 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
781 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
783 if (acpi_bus_get_device(handle, &device)) {
784 printk(KERN_ERR PREFIX
785 "Device don't exist, dropping EJECT\n");
786 break;
788 pr = acpi_driver_data(device);
789 if (!pr) {
790 printk(KERN_ERR PREFIX
791 "Driver data is NULL, dropping EJECT\n");
792 return;
794 break;
795 default:
796 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
797 "Unsupported event [0x%x]\n", event));
798 break;
801 return;
804 static acpi_status
805 processor_walk_namespace_cb(acpi_handle handle,
806 u32 lvl, void *context, void **rv)
808 acpi_status status;
809 int *action = context;
810 acpi_object_type type = 0;
812 status = acpi_get_type(handle, &type);
813 if (ACPI_FAILURE(status))
814 return (AE_OK);
816 if (type != ACPI_TYPE_PROCESSOR)
817 return (AE_OK);
819 switch (*action) {
820 case INSTALL_NOTIFY_HANDLER:
821 acpi_install_notify_handler(handle,
822 ACPI_SYSTEM_NOTIFY,
823 acpi_processor_hotplug_notify,
824 NULL);
825 break;
826 case UNINSTALL_NOTIFY_HANDLER:
827 acpi_remove_notify_handler(handle,
828 ACPI_SYSTEM_NOTIFY,
829 acpi_processor_hotplug_notify);
830 break;
831 default:
832 break;
835 return (AE_OK);
838 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
841 if (!is_processor_present(handle)) {
842 return AE_ERROR;
845 if (acpi_map_lsapic(handle, p_cpu))
846 return AE_ERROR;
848 if (arch_register_cpu(*p_cpu)) {
849 acpi_unmap_lsapic(*p_cpu);
850 return AE_ERROR;
853 return AE_OK;
856 static int acpi_processor_handle_eject(struct acpi_processor *pr)
858 if (cpu_online(pr->id))
859 cpu_down(pr->id);
861 arch_unregister_cpu(pr->id);
862 acpi_unmap_lsapic(pr->id);
863 return (0);
865 #else
866 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
868 return AE_ERROR;
870 static int acpi_processor_handle_eject(struct acpi_processor *pr)
872 return (-EINVAL);
874 #endif
876 static
877 void acpi_processor_install_hotplug_notify(void)
879 #ifdef CONFIG_ACPI_HOTPLUG_CPU
880 int action = INSTALL_NOTIFY_HANDLER;
881 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
882 ACPI_ROOT_OBJECT,
883 ACPI_UINT32_MAX,
884 processor_walk_namespace_cb, NULL, &action, NULL);
885 #endif
886 register_hotcpu_notifier(&acpi_cpu_notifier);
889 static
890 void acpi_processor_uninstall_hotplug_notify(void)
892 #ifdef CONFIG_ACPI_HOTPLUG_CPU
893 int action = UNINSTALL_NOTIFY_HANDLER;
894 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
895 ACPI_ROOT_OBJECT,
896 ACPI_UINT32_MAX,
897 processor_walk_namespace_cb, NULL, &action, NULL);
898 #endif
899 unregister_hotcpu_notifier(&acpi_cpu_notifier);
903 * We keep the driver loaded even when ACPI is not running.
904 * This is needed for the powernow-k8 driver, that works even without
905 * ACPI, but needs symbols from this driver
908 static int __init acpi_processor_init(void)
910 int result = 0;
912 if (acpi_disabled)
913 return 0;
915 memset(&errata, 0, sizeof(errata));
917 #ifdef CONFIG_ACPI_PROCFS
918 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
919 if (!acpi_processor_dir)
920 return -ENOMEM;
921 #endif
922 result = cpuidle_register_driver(&acpi_idle_driver);
923 if (result < 0)
924 goto out_proc;
926 result = acpi_bus_register_driver(&acpi_processor_driver);
927 if (result < 0)
928 goto out_cpuidle;
930 acpi_processor_install_hotplug_notify();
932 acpi_thermal_cpufreq_init();
934 acpi_processor_ppc_init();
936 acpi_processor_throttling_init();
938 return 0;
940 out_cpuidle:
941 cpuidle_unregister_driver(&acpi_idle_driver);
943 out_proc:
944 #ifdef CONFIG_ACPI_PROCFS
945 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
946 #endif
948 return result;
951 static void __exit acpi_processor_exit(void)
953 if (acpi_disabled)
954 return;
956 acpi_processor_ppc_exit();
958 acpi_thermal_cpufreq_exit();
960 acpi_processor_uninstall_hotplug_notify();
962 acpi_bus_unregister_driver(&acpi_processor_driver);
964 cpuidle_unregister_driver(&acpi_idle_driver);
966 #ifdef CONFIG_ACPI_PROCFS
967 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
968 #endif
970 return;
973 module_init(acpi_processor_init);
974 module_exit(acpi_processor_exit);
976 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
978 MODULE_ALIAS("processor");