ACPI: fix 80 char overflow
[linux-2.6.git] / drivers / acpi / processor_driver.c
1 /*
2  * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
3  *
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
9  *
10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11  *
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.
16  *
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.
21  *
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.
25  *
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.
33  */
34
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/dmi.h>
44 #include <linux/moduleparam.h>
45 #include <linux/cpuidle.h>
46 #include <linux/slab.h>
47
48 #include <asm/io.h>
49 #include <asm/system.h>
50 #include <asm/cpu.h>
51 #include <asm/delay.h>
52 #include <asm/uaccess.h>
53 #include <asm/processor.h>
54 #include <asm/smp.h>
55 #include <asm/acpi.h>
56
57 #include <acpi/acpi_bus.h>
58 #include <acpi/acpi_drivers.h>
59 #include <acpi/processor.h>
60
61 #define PREFIX "ACPI: "
62
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
71
72 #define ACPI_PROCESSOR_LIMIT_USER       0
73 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
74
75 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
76 ACPI_MODULE_NAME("processor_driver");
77
78 MODULE_AUTHOR("Paul Diefenbaugh");
79 MODULE_DESCRIPTION("ACPI Processor Driver");
80 MODULE_LICENSE("GPL");
81
82 static int acpi_processor_add(struct acpi_device *device);
83 static int acpi_processor_remove(struct acpi_device *device, int type);
84 static void acpi_processor_notify(struct acpi_device *device, u32 event);
85 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
86 static int acpi_processor_handle_eject(struct acpi_processor *pr);
87
88
89 static const struct acpi_device_id processor_device_ids[] = {
90         {ACPI_PROCESSOR_OBJECT_HID, 0},
91         {"ACPI0007", 0},
92         {"", 0},
93 };
94 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
95
96 static struct acpi_driver acpi_processor_driver = {
97         .name = "processor",
98         .class = ACPI_PROCESSOR_CLASS,
99         .ids = processor_device_ids,
100         .ops = {
101                 .add = acpi_processor_add,
102                 .remove = acpi_processor_remove,
103                 .suspend = acpi_processor_suspend,
104                 .resume = acpi_processor_resume,
105                 .notify = acpi_processor_notify,
106                 },
107 };
108
109 #define INSTALL_NOTIFY_HANDLER          1
110 #define UNINSTALL_NOTIFY_HANDLER        2
111
112 DEFINE_PER_CPU(struct acpi_processor *, processors);
113 EXPORT_PER_CPU_SYMBOL(processors);
114
115 struct acpi_processor_errata errata __read_mostly;
116
117 /* --------------------------------------------------------------------------
118                                 Errata Handling
119    -------------------------------------------------------------------------- */
120
121 static int acpi_processor_errata_piix4(struct pci_dev *dev)
122 {
123         u8 value1 = 0;
124         u8 value2 = 0;
125
126
127         if (!dev)
128                 return -EINVAL;
129
130         /*
131          * Note that 'dev' references the PIIX4 ACPI Controller.
132          */
133
134         switch (dev->revision) {
135         case 0:
136                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
137                 break;
138         case 1:
139                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
140                 break;
141         case 2:
142                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
143                 break;
144         case 3:
145                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
146                 break;
147         default:
148                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
149                 break;
150         }
151
152         switch (dev->revision) {
153
154         case 0:         /* PIIX4 A-step */
155         case 1:         /* PIIX4 B-step */
156                 /*
157                  * See specification changes #13 ("Manual Throttle Duty Cycle")
158                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
159                  * erratum #5 ("STPCLK# Deassertion Time") from the January
160                  * 2002 PIIX4 specification update.  Applies to only older
161                  * PIIX4 models.
162                  */
163                 errata.piix4.throttle = 1;
164
165         case 2:         /* PIIX4E */
166         case 3:         /* PIIX4M */
167                 /*
168                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
169                  * Livelock") from the January 2002 PIIX4 specification update.
170                  * Applies to all PIIX4 models.
171                  */
172
173                 /*
174                  * BM-IDE
175                  * ------
176                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
177                  * Status register address.  We'll use this later to read
178                  * each IDE controller's DMA status to make sure we catch all
179                  * DMA activity.
180                  */
181                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
182                                      PCI_DEVICE_ID_INTEL_82371AB,
183                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
184                 if (dev) {
185                         errata.piix4.bmisx = pci_resource_start(dev, 4);
186                         pci_dev_put(dev);
187                 }
188
189                 /*
190                  * Type-F DMA
191                  * ----------
192                  * Find the PIIX4 ISA Controller and read the Motherboard
193                  * DMA controller's status to see if Type-F (Fast) DMA mode
194                  * is enabled (bit 7) on either channel.  Note that we'll
195                  * disable C3 support if this is enabled, as some legacy
196                  * devices won't operate well if fast DMA is disabled.
197                  */
198                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
199                                      PCI_DEVICE_ID_INTEL_82371AB_0,
200                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
201                 if (dev) {
202                         pci_read_config_byte(dev, 0x76, &value1);
203                         pci_read_config_byte(dev, 0x77, &value2);
204                         if ((value1 & 0x80) || (value2 & 0x80))
205                                 errata.piix4.fdma = 1;
206                         pci_dev_put(dev);
207                 }
208
209                 break;
210         }
211
212         if (errata.piix4.bmisx)
213                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
214                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
215         if (errata.piix4.fdma)
216                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
217                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
218
219         return 0;
220 }
221
222 static int acpi_processor_errata(struct acpi_processor *pr)
223 {
224         int result = 0;
225         struct pci_dev *dev = NULL;
226
227
228         if (!pr)
229                 return -EINVAL;
230
231         /*
232          * PIIX4
233          */
234         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
235                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
236                              PCI_ANY_ID, NULL);
237         if (dev) {
238                 result = acpi_processor_errata_piix4(dev);
239                 pci_dev_put(dev);
240         }
241
242         return result;
243 }
244
245 /* --------------------------------------------------------------------------
246                                  Driver Interface
247    -------------------------------------------------------------------------- */
248
249 static int acpi_processor_get_info(struct acpi_device *device)
250 {
251         acpi_status status = 0;
252         union acpi_object object = { 0 };
253         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
254         struct acpi_processor *pr;
255         int cpu_index, device_declaration = 0;
256         static int cpu0_initialized;
257
258         pr = acpi_driver_data(device);
259         if (!pr)
260                 return -EINVAL;
261
262         if (num_online_cpus() > 1)
263                 errata.smp = TRUE;
264
265         acpi_processor_errata(pr);
266
267         /*
268          * Check to see if we have bus mastering arbitration control.  This
269          * is required for proper C3 usage (to maintain cache coherency).
270          */
271         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
272                 pr->flags.bm_control = 1;
273                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
274                                   "Bus mastering arbitration control present\n"));
275         } else
276                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
277                                   "No bus mastering arbitration control\n"));
278
279         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
280                 /* Declared with "Processor" statement; match ProcessorID */
281                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
282                 if (ACPI_FAILURE(status)) {
283                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
284                         return -ENODEV;
285                 }
286
287                 /*
288                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
289                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
290                  *      arch/xxx/acpi.c
291                  */
292                 pr->acpi_id = object.processor.proc_id;
293         } else {
294                 /*
295                  * Declared with "Device" statement; match _UID.
296                  * Note that we don't handle string _UIDs yet.
297                  */
298                 unsigned long long value;
299                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
300                                                 NULL, &value);
301                 if (ACPI_FAILURE(status)) {
302                         printk(KERN_ERR PREFIX
303                             "Evaluating processor _UID [%#x]\n", status);
304                         return -ENODEV;
305                 }
306                 device_declaration = 1;
307                 pr->acpi_id = value;
308         }
309         cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
310
311         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
312         if (!cpu0_initialized && (cpu_index == -1) &&
313             (num_online_cpus() == 1)) {
314                 cpu_index = 0;
315         }
316
317         cpu0_initialized = 1;
318
319         pr->id = cpu_index;
320
321         /*
322          *  Extra Processor objects may be enumerated on MP systems with
323          *  less than the max # of CPUs. They should be ignored _iff
324          *  they are physically not present.
325          */
326         if (pr->id == -1) {
327                 if (ACPI_FAILURE
328                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
329                         return -ENODEV;
330                 }
331         }
332         /*
333          * On some boxes several processors use the same processor bus id.
334          * But they are located in different scope. For example:
335          * \_SB.SCK0.CPU0
336          * \_SB.SCK1.CPU0
337          * Rename the processor device bus id. And the new bus id will be
338          * generated as the following format:
339          * CPU+CPU ID.
340          */
341         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
342         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
343                           pr->acpi_id));
344
345         if (!object.processor.pblk_address)
346                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
347         else if (object.processor.pblk_length != 6)
348                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
349                             object.processor.pblk_length);
350         else {
351                 pr->throttling.address = object.processor.pblk_address;
352                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
353                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
354
355                 pr->pblk = object.processor.pblk_address;
356
357                 /*
358                  * We don't care about error returns - we just try to mark
359                  * these reserved so that nobody else is confused into thinking
360                  * that this region might be unused..
361                  *
362                  * (In particular, allocating the IO range for Cardbus)
363                  */
364                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
365         }
366
367         /*
368          * If ACPI describes a slot number for this CPU, we can use it
369          * ensure we get the right value in the "physical id" field
370          * of /proc/cpuinfo
371          */
372         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
373         if (ACPI_SUCCESS(status))
374                 arch_fix_phys_package_id(pr->id, object.integer.value);
375
376         return 0;
377 }
378
379 static DEFINE_PER_CPU(void *, processor_device_array);
380
381 static void acpi_processor_notify(struct acpi_device *device, u32 event)
382 {
383         struct acpi_processor *pr = acpi_driver_data(device);
384         int saved;
385
386         if (!pr)
387                 return;
388
389         switch (event) {
390         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
391                 saved = pr->performance_platform_limit;
392                 acpi_processor_ppc_has_changed(pr, 1);
393                 if (saved == pr->performance_platform_limit)
394                         break;
395                 acpi_bus_generate_proc_event(device, event,
396                                         pr->performance_platform_limit);
397                 acpi_bus_generate_netlink_event(device->pnp.device_class,
398                                                   dev_name(&device->dev), event,
399                                                   pr->performance_platform_limit);
400                 break;
401         case ACPI_PROCESSOR_NOTIFY_POWER:
402                 acpi_processor_cst_has_changed(pr);
403                 acpi_bus_generate_proc_event(device, event, 0);
404                 acpi_bus_generate_netlink_event(device->pnp.device_class,
405                                                   dev_name(&device->dev), event, 0);
406                 break;
407         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
408                 acpi_processor_tstate_has_changed(pr);
409                 acpi_bus_generate_proc_event(device, event, 0);
410                 acpi_bus_generate_netlink_event(device->pnp.device_class,
411                                                   dev_name(&device->dev), event, 0);
412         default:
413                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
414                                   "Unsupported event [0x%x]\n", event));
415                 break;
416         }
417
418         return;
419 }
420
421 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
422                 unsigned long action, void *hcpu)
423 {
424         unsigned int cpu = (unsigned long)hcpu;
425         struct acpi_processor *pr = per_cpu(processors, cpu);
426
427         if (action == CPU_ONLINE && pr) {
428                 acpi_processor_ppc_has_changed(pr, 0);
429                 acpi_processor_cst_has_changed(pr);
430                 acpi_processor_reevaluate_tstate(pr, action);
431                 acpi_processor_tstate_has_changed(pr);
432         }
433         if (action == CPU_DEAD && pr) {
434                 /* invalidate the flag.throttling after one CPU is offline */
435                 acpi_processor_reevaluate_tstate(pr, action);
436         }
437         return NOTIFY_OK;
438 }
439
440 static struct notifier_block acpi_cpu_notifier =
441 {
442             .notifier_call = acpi_cpu_soft_notify,
443 };
444
445 static int __cpuinit acpi_processor_add(struct acpi_device *device)
446 {
447         struct acpi_processor *pr = NULL;
448         int result = 0;
449         struct sys_device *sysdev;
450
451         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
452         if (!pr)
453                 return -ENOMEM;
454
455         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
456                 kfree(pr);
457                 return -ENOMEM;
458         }
459
460         pr->handle = device->handle;
461         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
462         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
463         device->driver_data = pr;
464
465         result = acpi_processor_get_info(device);
466         if (result) {
467                 /* Processor is physically not present */
468                 return 0;
469         }
470
471 #ifdef CONFIG_SMP
472         if (pr->id >= setup_max_cpus && pr->id != 0)
473                 return 0;
474 #endif
475
476         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
477
478         /*
479          * Buggy BIOS check
480          * ACPI id of processors can be reported wrongly by the BIOS.
481          * Don't trust it blindly
482          */
483         if (per_cpu(processor_device_array, pr->id) != NULL &&
484             per_cpu(processor_device_array, pr->id) != device) {
485                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
486                         "for the processor\n");
487                 result = -ENODEV;
488                 goto err_free_cpumask;
489         }
490         per_cpu(processor_device_array, pr->id) = device;
491
492         per_cpu(processors, pr->id) = pr;
493
494         sysdev = get_cpu_sysdev(pr->id);
495         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
496                 result = -EFAULT;
497                 goto err_free_cpumask;
498         }
499
500 #ifdef CONFIG_CPU_FREQ
501         acpi_processor_ppc_has_changed(pr, 0);
502 #endif
503         acpi_processor_get_throttling_info(pr);
504         acpi_processor_get_limit_info(pr);
505
506
507         if (cpuidle_get_driver() == &acpi_idle_driver)
508                 acpi_processor_power_init(pr, device);
509
510         pr->cdev = thermal_cooling_device_register("Processor", device,
511                                                 &processor_cooling_ops);
512         if (IS_ERR(pr->cdev)) {
513                 result = PTR_ERR(pr->cdev);
514                 goto err_power_exit;
515         }
516
517         dev_dbg(&device->dev, "registered as cooling_device%d\n",
518                  pr->cdev->id);
519
520         result = sysfs_create_link(&device->dev.kobj,
521                                    &pr->cdev->device.kobj,
522                                    "thermal_cooling");
523         if (result) {
524                 printk(KERN_ERR PREFIX "Create sysfs link\n");
525                 goto err_thermal_unregister;
526         }
527         result = sysfs_create_link(&pr->cdev->device.kobj,
528                                    &device->dev.kobj,
529                                    "device");
530         if (result) {
531                 printk(KERN_ERR PREFIX "Create sysfs link\n");
532                 goto err_remove_sysfs;
533         }
534
535         return 0;
536
537 err_remove_sysfs:
538         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
539 err_thermal_unregister:
540         thermal_cooling_device_unregister(pr->cdev);
541 err_power_exit:
542         acpi_processor_power_exit(pr, device);
543 err_free_cpumask:
544         free_cpumask_var(pr->throttling.shared_cpu_map);
545
546         return result;
547 }
548
549 static int acpi_processor_remove(struct acpi_device *device, int type)
550 {
551         struct acpi_processor *pr = NULL;
552
553
554         if (!device || !acpi_driver_data(device))
555                 return -EINVAL;
556
557         pr = acpi_driver_data(device);
558
559         if (pr->id >= nr_cpu_ids)
560                 goto free;
561
562         if (type == ACPI_BUS_REMOVAL_EJECT) {
563                 if (acpi_processor_handle_eject(pr))
564                         return -EINVAL;
565         }
566
567         acpi_processor_power_exit(pr, device);
568
569         sysfs_remove_link(&device->dev.kobj, "sysdev");
570
571         if (pr->cdev) {
572                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
573                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
574                 thermal_cooling_device_unregister(pr->cdev);
575                 pr->cdev = NULL;
576         }
577
578         per_cpu(processors, pr->id) = NULL;
579         per_cpu(processor_device_array, pr->id) = NULL;
580
581 free:
582         free_cpumask_var(pr->throttling.shared_cpu_map);
583         kfree(pr);
584
585         return 0;
586 }
587
588 #ifdef CONFIG_ACPI_HOTPLUG_CPU
589 /****************************************************************************
590  *      Acpi processor hotplug support                                      *
591  ****************************************************************************/
592
593 static int is_processor_present(acpi_handle handle)
594 {
595         acpi_status status;
596         unsigned long long sta = 0;
597
598
599         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
600
601         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
602                 return 1;
603
604         /*
605          * _STA is mandatory for a processor that supports hot plug
606          */
607         if (status == AE_NOT_FOUND)
608                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
609                                 "Processor does not support hot plug\n"));
610         else
611                 ACPI_EXCEPTION((AE_INFO, status,
612                                 "Processor Device is not present"));
613         return 0;
614 }
615
616 static
617 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
618 {
619         acpi_handle phandle;
620         struct acpi_device *pdev;
621
622
623         if (acpi_get_parent(handle, &phandle)) {
624                 return -ENODEV;
625         }
626
627         if (acpi_bus_get_device(phandle, &pdev)) {
628                 return -ENODEV;
629         }
630
631         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
632                 return -ENODEV;
633         }
634
635         return 0;
636 }
637
638 static void acpi_processor_hotplug_notify(acpi_handle handle,
639                                           u32 event, void *data)
640 {
641         struct acpi_processor *pr;
642         struct acpi_device *device = NULL;
643         int result;
644
645
646         switch (event) {
647         case ACPI_NOTIFY_BUS_CHECK:
648         case ACPI_NOTIFY_DEVICE_CHECK:
649                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
650                 "Processor driver received %s event\n",
651                        (event == ACPI_NOTIFY_BUS_CHECK) ?
652                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
653
654                 if (!is_processor_present(handle))
655                         break;
656
657                 if (acpi_bus_get_device(handle, &device)) {
658                         result = acpi_processor_device_add(handle, &device);
659                         if (result)
660                                 printk(KERN_ERR PREFIX
661                                             "Unable to add the device\n");
662                         break;
663                 }
664                 break;
665         case ACPI_NOTIFY_EJECT_REQUEST:
666                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
667                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
668
669                 if (acpi_bus_get_device(handle, &device)) {
670                         printk(KERN_ERR PREFIX
671                                     "Device don't exist, dropping EJECT\n");
672                         break;
673                 }
674                 pr = acpi_driver_data(device);
675                 if (!pr) {
676                         printk(KERN_ERR PREFIX
677                                     "Driver data is NULL, dropping EJECT\n");
678                         return;
679                 }
680                 break;
681         default:
682                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
683                                   "Unsupported event [0x%x]\n", event));
684                 break;
685         }
686
687         return;
688 }
689
690 static acpi_status
691 processor_walk_namespace_cb(acpi_handle handle,
692                             u32 lvl, void *context, void **rv)
693 {
694         acpi_status status;
695         int *action = context;
696         acpi_object_type type = 0;
697
698         status = acpi_get_type(handle, &type);
699         if (ACPI_FAILURE(status))
700                 return (AE_OK);
701
702         if (type != ACPI_TYPE_PROCESSOR)
703                 return (AE_OK);
704
705         switch (*action) {
706         case INSTALL_NOTIFY_HANDLER:
707                 acpi_install_notify_handler(handle,
708                                             ACPI_SYSTEM_NOTIFY,
709                                             acpi_processor_hotplug_notify,
710                                             NULL);
711                 break;
712         case UNINSTALL_NOTIFY_HANDLER:
713                 acpi_remove_notify_handler(handle,
714                                            ACPI_SYSTEM_NOTIFY,
715                                            acpi_processor_hotplug_notify);
716                 break;
717         default:
718                 break;
719         }
720
721         return (AE_OK);
722 }
723
724 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
725 {
726
727         if (!is_processor_present(handle)) {
728                 return AE_ERROR;
729         }
730
731         if (acpi_map_lsapic(handle, p_cpu))
732                 return AE_ERROR;
733
734         if (arch_register_cpu(*p_cpu)) {
735                 acpi_unmap_lsapic(*p_cpu);
736                 return AE_ERROR;
737         }
738
739         return AE_OK;
740 }
741
742 static int acpi_processor_handle_eject(struct acpi_processor *pr)
743 {
744         if (cpu_online(pr->id))
745                 cpu_down(pr->id);
746
747         arch_unregister_cpu(pr->id);
748         acpi_unmap_lsapic(pr->id);
749         return (0);
750 }
751 #else
752 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
753 {
754         return AE_ERROR;
755 }
756 static int acpi_processor_handle_eject(struct acpi_processor *pr)
757 {
758         return (-EINVAL);
759 }
760 #endif
761
762 static
763 void acpi_processor_install_hotplug_notify(void)
764 {
765 #ifdef CONFIG_ACPI_HOTPLUG_CPU
766         int action = INSTALL_NOTIFY_HANDLER;
767         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
768                             ACPI_ROOT_OBJECT,
769                             ACPI_UINT32_MAX,
770                             processor_walk_namespace_cb, NULL, &action, NULL);
771 #endif
772         register_hotcpu_notifier(&acpi_cpu_notifier);
773 }
774
775 static
776 void acpi_processor_uninstall_hotplug_notify(void)
777 {
778 #ifdef CONFIG_ACPI_HOTPLUG_CPU
779         int action = UNINSTALL_NOTIFY_HANDLER;
780         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
781                             ACPI_ROOT_OBJECT,
782                             ACPI_UINT32_MAX,
783                             processor_walk_namespace_cb, NULL, &action, NULL);
784 #endif
785         unregister_hotcpu_notifier(&acpi_cpu_notifier);
786 }
787
788 /*
789  * We keep the driver loaded even when ACPI is not running.
790  * This is needed for the powernow-k8 driver, that works even without
791  * ACPI, but needs symbols from this driver
792  */
793
794 static int __init acpi_processor_init(void)
795 {
796         int result = 0;
797
798         if (acpi_disabled)
799                 return 0;
800
801         memset(&errata, 0, sizeof(errata));
802
803         if (!cpuidle_register_driver(&acpi_idle_driver)) {
804                 printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",
805                         acpi_idle_driver.name);
806         } else {
807                 printk(KERN_DEBUG "ACPI: acpi_idle yielding to %s\n",
808                         cpuidle_get_driver()->name);
809         }
810
811         result = acpi_bus_register_driver(&acpi_processor_driver);
812         if (result < 0)
813                 goto out_cpuidle;
814
815         acpi_processor_install_hotplug_notify();
816
817         acpi_thermal_cpufreq_init();
818
819         acpi_processor_ppc_init();
820
821         acpi_processor_throttling_init();
822
823         return 0;
824
825 out_cpuidle:
826         cpuidle_unregister_driver(&acpi_idle_driver);
827
828         return result;
829 }
830
831 static void __exit acpi_processor_exit(void)
832 {
833         if (acpi_disabled)
834                 return;
835
836         acpi_processor_ppc_exit();
837
838         acpi_thermal_cpufreq_exit();
839
840         acpi_processor_uninstall_hotplug_notify();
841
842         acpi_bus_unregister_driver(&acpi_processor_driver);
843
844         cpuidle_unregister_driver(&acpi_idle_driver);
845
846         return;
847 }
848
849 module_init(acpi_processor_init);
850 module_exit(acpi_processor_exit);
851
852 MODULE_ALIAS("processor");