Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/hfsplus
[pandora-kernel.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/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/dmi.h>
46 #include <linux/moduleparam.h>
47 #include <linux/cpuidle.h>
48 #include <linux/slab.h>
49
50 #include <asm/io.h>
51 #include <asm/system.h>
52 #include <asm/cpu.h>
53 #include <asm/delay.h>
54 #include <asm/uaccess.h>
55 #include <asm/processor.h>
56 #include <asm/smp.h>
57 #include <asm/acpi.h>
58
59 #include <acpi/acpi_bus.h>
60 #include <acpi/acpi_drivers.h>
61 #include <acpi/processor.h>
62
63 #define PREFIX "ACPI: "
64
65 #define ACPI_PROCESSOR_CLASS            "processor"
66 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
67 #define ACPI_PROCESSOR_FILE_INFO        "info"
68 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
69 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
70 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
71 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
72 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
73
74 #define ACPI_PROCESSOR_LIMIT_USER       0
75 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
76
77 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
78 ACPI_MODULE_NAME("processor_driver");
79
80 MODULE_AUTHOR("Paul Diefenbaugh");
81 MODULE_DESCRIPTION("ACPI Processor Driver");
82 MODULE_LICENSE("GPL");
83
84 static int acpi_processor_add(struct acpi_device *device);
85 static int acpi_processor_remove(struct acpi_device *device, int type);
86 static void acpi_processor_notify(struct acpi_device *device, u32 event);
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);
89
90
91 static const struct acpi_device_id processor_device_ids[] = {
92         {ACPI_PROCESSOR_OBJECT_HID, 0},
93         {"ACPI0007", 0},
94         {"", 0},
95 };
96 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
97
98 static struct acpi_driver acpi_processor_driver = {
99         .name = "processor",
100         .class = ACPI_PROCESSOR_CLASS,
101         .ids = processor_device_ids,
102         .ops = {
103                 .add = acpi_processor_add,
104                 .remove = acpi_processor_remove,
105                 .suspend = acpi_processor_suspend,
106                 .resume = acpi_processor_resume,
107                 .notify = acpi_processor_notify,
108                 },
109 };
110
111 #define INSTALL_NOTIFY_HANDLER          1
112 #define UNINSTALL_NOTIFY_HANDLER        2
113
114 DEFINE_PER_CPU(struct acpi_processor *, processors);
115 EXPORT_PER_CPU_SYMBOL(processors);
116
117 struct acpi_processor_errata errata __read_mostly;
118
119 /* --------------------------------------------------------------------------
120                                 Errata Handling
121    -------------------------------------------------------------------------- */
122
123 static int acpi_processor_errata_piix4(struct pci_dev *dev)
124 {
125         u8 value1 = 0;
126         u8 value2 = 0;
127
128
129         if (!dev)
130                 return -EINVAL;
131
132         /*
133          * Note that 'dev' references the PIIX4 ACPI Controller.
134          */
135
136         switch (dev->revision) {
137         case 0:
138                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
139                 break;
140         case 1:
141                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
142                 break;
143         case 2:
144                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
145                 break;
146         case 3:
147                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
148                 break;
149         default:
150                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
151                 break;
152         }
153
154         switch (dev->revision) {
155
156         case 0:         /* PIIX4 A-step */
157         case 1:         /* PIIX4 B-step */
158                 /*
159                  * See specification changes #13 ("Manual Throttle Duty Cycle")
160                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
161                  * erratum #5 ("STPCLK# Deassertion Time") from the January
162                  * 2002 PIIX4 specification update.  Applies to only older
163                  * PIIX4 models.
164                  */
165                 errata.piix4.throttle = 1;
166
167         case 2:         /* PIIX4E */
168         case 3:         /* PIIX4M */
169                 /*
170                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
171                  * Livelock") from the January 2002 PIIX4 specification update.
172                  * Applies to all PIIX4 models.
173                  */
174
175                 /*
176                  * BM-IDE
177                  * ------
178                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
179                  * Status register address.  We'll use this later to read
180                  * each IDE controller's DMA status to make sure we catch all
181                  * DMA activity.
182                  */
183                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
184                                      PCI_DEVICE_ID_INTEL_82371AB,
185                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
186                 if (dev) {
187                         errata.piix4.bmisx = pci_resource_start(dev, 4);
188                         pci_dev_put(dev);
189                 }
190
191                 /*
192                  * Type-F DMA
193                  * ----------
194                  * Find the PIIX4 ISA Controller and read the Motherboard
195                  * DMA controller's status to see if Type-F (Fast) DMA mode
196                  * is enabled (bit 7) on either channel.  Note that we'll
197                  * disable C3 support if this is enabled, as some legacy
198                  * devices won't operate well if fast DMA is disabled.
199                  */
200                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
201                                      PCI_DEVICE_ID_INTEL_82371AB_0,
202                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
203                 if (dev) {
204                         pci_read_config_byte(dev, 0x76, &value1);
205                         pci_read_config_byte(dev, 0x77, &value2);
206                         if ((value1 & 0x80) || (value2 & 0x80))
207                                 errata.piix4.fdma = 1;
208                         pci_dev_put(dev);
209                 }
210
211                 break;
212         }
213
214         if (errata.piix4.bmisx)
215                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
216                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
217         if (errata.piix4.fdma)
218                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
219                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
220
221         return 0;
222 }
223
224 static int acpi_processor_errata(struct acpi_processor *pr)
225 {
226         int result = 0;
227         struct pci_dev *dev = NULL;
228
229
230         if (!pr)
231                 return -EINVAL;
232
233         /*
234          * PIIX4
235          */
236         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
237                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
238                              PCI_ANY_ID, NULL);
239         if (dev) {
240                 result = acpi_processor_errata_piix4(dev);
241                 pci_dev_put(dev);
242         }
243
244         return result;
245 }
246
247 static struct proc_dir_entry *acpi_processor_dir = NULL;
248
249 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
250 {
251         struct proc_dir_entry *entry = NULL;
252
253
254         if (!acpi_device_dir(device)) {
255                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
256                                                      acpi_processor_dir);
257                 if (!acpi_device_dir(device))
258                         return -ENODEV;
259         }
260
261         /* 'throttling' [R/W] */
262         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
263                                  S_IFREG | S_IRUGO | S_IWUSR,
264                                  acpi_device_dir(device),
265                                  &acpi_processor_throttling_fops,
266                                  acpi_driver_data(device));
267         if (!entry)
268                 return -EIO;
269         return 0;
270 }
271 static int acpi_processor_remove_fs(struct acpi_device *device)
272 {
273
274         if (acpi_device_dir(device)) {
275                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
276                                   acpi_device_dir(device));
277                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
278                 acpi_device_dir(device) = NULL;
279         }
280
281         return 0;
282 }
283
284 /* --------------------------------------------------------------------------
285                                  Driver Interface
286    -------------------------------------------------------------------------- */
287
288 static int acpi_processor_get_info(struct acpi_device *device)
289 {
290         acpi_status status = 0;
291         union acpi_object object = { 0 };
292         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
293         struct acpi_processor *pr;
294         int cpu_index, device_declaration = 0;
295         static int cpu0_initialized;
296
297         pr = acpi_driver_data(device);
298         if (!pr)
299                 return -EINVAL;
300
301         if (num_online_cpus() > 1)
302                 errata.smp = TRUE;
303
304         acpi_processor_errata(pr);
305
306         /*
307          * Check to see if we have bus mastering arbitration control.  This
308          * is required for proper C3 usage (to maintain cache coherency).
309          */
310         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
311                 pr->flags.bm_control = 1;
312                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
313                                   "Bus mastering arbitration control present\n"));
314         } else
315                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
316                                   "No bus mastering arbitration control\n"));
317
318         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
319                 /* Declared with "Processor" statement; match ProcessorID */
320                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
321                 if (ACPI_FAILURE(status)) {
322                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
323                         return -ENODEV;
324                 }
325
326                 /*
327                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
328                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
329                  *      arch/xxx/acpi.c
330                  */
331                 pr->acpi_id = object.processor.proc_id;
332         } else {
333                 /*
334                  * Declared with "Device" statement; match _UID.
335                  * Note that we don't handle string _UIDs yet.
336                  */
337                 unsigned long long value;
338                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
339                                                 NULL, &value);
340                 if (ACPI_FAILURE(status)) {
341                         printk(KERN_ERR PREFIX
342                             "Evaluating processor _UID [%#x]\n", status);
343                         return -ENODEV;
344                 }
345                 device_declaration = 1;
346                 pr->acpi_id = value;
347         }
348         cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
349
350         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
351         if (!cpu0_initialized && (cpu_index == -1) &&
352             (num_online_cpus() == 1)) {
353                 cpu_index = 0;
354         }
355
356         cpu0_initialized = 1;
357
358         pr->id = cpu_index;
359
360         /*
361          *  Extra Processor objects may be enumerated on MP systems with
362          *  less than the max # of CPUs. They should be ignored _iff
363          *  they are physically not present.
364          */
365         if (pr->id == -1) {
366                 if (ACPI_FAILURE
367                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
368                         return -ENODEV;
369                 }
370         }
371         /*
372          * On some boxes several processors use the same processor bus id.
373          * But they are located in different scope. For example:
374          * \_SB.SCK0.CPU0
375          * \_SB.SCK1.CPU0
376          * Rename the processor device bus id. And the new bus id will be
377          * generated as the following format:
378          * CPU+CPU ID.
379          */
380         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
381         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
382                           pr->acpi_id));
383
384         if (!object.processor.pblk_address)
385                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
386         else if (object.processor.pblk_length != 6)
387                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
388                             object.processor.pblk_length);
389         else {
390                 pr->throttling.address = object.processor.pblk_address;
391                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
392                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
393
394                 pr->pblk = object.processor.pblk_address;
395
396                 /*
397                  * We don't care about error returns - we just try to mark
398                  * these reserved so that nobody else is confused into thinking
399                  * that this region might be unused..
400                  *
401                  * (In particular, allocating the IO range for Cardbus)
402                  */
403                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
404         }
405
406         /*
407          * If ACPI describes a slot number for this CPU, we can use it
408          * ensure we get the right value in the "physical id" field
409          * of /proc/cpuinfo
410          */
411         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
412         if (ACPI_SUCCESS(status))
413                 arch_fix_phys_package_id(pr->id, object.integer.value);
414
415         return 0;
416 }
417
418 static DEFINE_PER_CPU(void *, processor_device_array);
419
420 static void acpi_processor_notify(struct acpi_device *device, u32 event)
421 {
422         struct acpi_processor *pr = acpi_driver_data(device);
423         int saved;
424
425         if (!pr)
426                 return;
427
428         switch (event) {
429         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
430                 saved = pr->performance_platform_limit;
431                 acpi_processor_ppc_has_changed(pr, 1);
432                 if (saved == pr->performance_platform_limit)
433                         break;
434                 acpi_bus_generate_proc_event(device, event,
435                                         pr->performance_platform_limit);
436                 acpi_bus_generate_netlink_event(device->pnp.device_class,
437                                                   dev_name(&device->dev), event,
438                                                   pr->performance_platform_limit);
439                 break;
440         case ACPI_PROCESSOR_NOTIFY_POWER:
441                 acpi_processor_cst_has_changed(pr);
442                 acpi_bus_generate_proc_event(device, event, 0);
443                 acpi_bus_generate_netlink_event(device->pnp.device_class,
444                                                   dev_name(&device->dev), event, 0);
445                 break;
446         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
447                 acpi_processor_tstate_has_changed(pr);
448                 acpi_bus_generate_proc_event(device, event, 0);
449                 acpi_bus_generate_netlink_event(device->pnp.device_class,
450                                                   dev_name(&device->dev), event, 0);
451         default:
452                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
453                                   "Unsupported event [0x%x]\n", event));
454                 break;
455         }
456
457         return;
458 }
459
460 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
461                 unsigned long action, void *hcpu)
462 {
463         unsigned int cpu = (unsigned long)hcpu;
464         struct acpi_processor *pr = per_cpu(processors, cpu);
465
466         if (action == CPU_ONLINE && pr) {
467                 acpi_processor_ppc_has_changed(pr, 0);
468                 acpi_processor_cst_has_changed(pr);
469                 acpi_processor_tstate_has_changed(pr);
470         }
471         return NOTIFY_OK;
472 }
473
474 static struct notifier_block acpi_cpu_notifier =
475 {
476             .notifier_call = acpi_cpu_soft_notify,
477 };
478
479 static int __cpuinit acpi_processor_add(struct acpi_device *device)
480 {
481         struct acpi_processor *pr = NULL;
482         int result = 0;
483         struct sys_device *sysdev;
484
485         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
486         if (!pr)
487                 return -ENOMEM;
488
489         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
490                 kfree(pr);
491                 return -ENOMEM;
492         }
493
494         pr->handle = device->handle;
495         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
496         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
497         device->driver_data = pr;
498
499         result = acpi_processor_get_info(device);
500         if (result) {
501                 /* Processor is physically not present */
502                 return 0;
503         }
504
505 #ifdef CONFIG_SMP
506         if (pr->id >= setup_max_cpus && pr->id != 0)
507                 return 0;
508 #endif
509
510         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
511
512         /*
513          * Buggy BIOS check
514          * ACPI id of processors can be reported wrongly by the BIOS.
515          * Don't trust it blindly
516          */
517         if (per_cpu(processor_device_array, pr->id) != NULL &&
518             per_cpu(processor_device_array, pr->id) != device) {
519                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
520                         "for the processor\n");
521                 result = -ENODEV;
522                 goto err_free_cpumask;
523         }
524         per_cpu(processor_device_array, pr->id) = device;
525
526         per_cpu(processors, pr->id) = pr;
527
528         result = acpi_processor_add_fs(device);
529         if (result)
530                 goto err_free_cpumask;
531
532         sysdev = get_cpu_sysdev(pr->id);
533         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
534                 result = -EFAULT;
535                 goto err_remove_fs;
536         }
537
538 #ifdef CONFIG_CPU_FREQ
539         acpi_processor_ppc_has_changed(pr, 0);
540 #endif
541         acpi_processor_get_throttling_info(pr);
542         acpi_processor_get_limit_info(pr);
543
544
545         if (cpuidle_get_driver() == &acpi_idle_driver)
546                 acpi_processor_power_init(pr, device);
547
548         pr->cdev = thermal_cooling_device_register("Processor", device,
549                                                 &processor_cooling_ops);
550         if (IS_ERR(pr->cdev)) {
551                 result = PTR_ERR(pr->cdev);
552                 goto err_power_exit;
553         }
554
555         dev_dbg(&device->dev, "registered as cooling_device%d\n",
556                  pr->cdev->id);
557
558         result = sysfs_create_link(&device->dev.kobj,
559                                    &pr->cdev->device.kobj,
560                                    "thermal_cooling");
561         if (result) {
562                 printk(KERN_ERR PREFIX "Create sysfs link\n");
563                 goto err_thermal_unregister;
564         }
565         result = sysfs_create_link(&pr->cdev->device.kobj,
566                                    &device->dev.kobj,
567                                    "device");
568         if (result) {
569                 printk(KERN_ERR PREFIX "Create sysfs link\n");
570                 goto err_remove_sysfs;
571         }
572
573         return 0;
574
575 err_remove_sysfs:
576         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
577 err_thermal_unregister:
578         thermal_cooling_device_unregister(pr->cdev);
579 err_power_exit:
580         acpi_processor_power_exit(pr, device);
581 err_remove_fs:
582         acpi_processor_remove_fs(device);
583 err_free_cpumask:
584         free_cpumask_var(pr->throttling.shared_cpu_map);
585
586         return result;
587 }
588
589 static int acpi_processor_remove(struct acpi_device *device, int type)
590 {
591         struct acpi_processor *pr = NULL;
592
593
594         if (!device || !acpi_driver_data(device))
595                 return -EINVAL;
596
597         pr = acpi_driver_data(device);
598
599         if (pr->id >= nr_cpu_ids)
600                 goto free;
601
602         if (type == ACPI_BUS_REMOVAL_EJECT) {
603                 if (acpi_processor_handle_eject(pr))
604                         return -EINVAL;
605         }
606
607         acpi_processor_power_exit(pr, device);
608
609         sysfs_remove_link(&device->dev.kobj, "sysdev");
610
611         acpi_processor_remove_fs(device);
612
613         if (pr->cdev) {
614                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
615                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
616                 thermal_cooling_device_unregister(pr->cdev);
617                 pr->cdev = NULL;
618         }
619
620         per_cpu(processors, pr->id) = NULL;
621         per_cpu(processor_device_array, pr->id) = NULL;
622
623 free:
624         free_cpumask_var(pr->throttling.shared_cpu_map);
625         kfree(pr);
626
627         return 0;
628 }
629
630 #ifdef CONFIG_ACPI_HOTPLUG_CPU
631 /****************************************************************************
632  *      Acpi processor hotplug support                                      *
633  ****************************************************************************/
634
635 static int is_processor_present(acpi_handle handle)
636 {
637         acpi_status status;
638         unsigned long long sta = 0;
639
640
641         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
642
643         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
644                 return 1;
645
646         /*
647          * _STA is mandatory for a processor that supports hot plug
648          */
649         if (status == AE_NOT_FOUND)
650                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
651                                 "Processor does not support hot plug\n"));
652         else
653                 ACPI_EXCEPTION((AE_INFO, status,
654                                 "Processor Device is not present"));
655         return 0;
656 }
657
658 static
659 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
660 {
661         acpi_handle phandle;
662         struct acpi_device *pdev;
663
664
665         if (acpi_get_parent(handle, &phandle)) {
666                 return -ENODEV;
667         }
668
669         if (acpi_bus_get_device(phandle, &pdev)) {
670                 return -ENODEV;
671         }
672
673         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
674                 return -ENODEV;
675         }
676
677         return 0;
678 }
679
680 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
681                                                 u32 event, void *data)
682 {
683         struct acpi_processor *pr;
684         struct acpi_device *device = NULL;
685         int result;
686
687
688         switch (event) {
689         case ACPI_NOTIFY_BUS_CHECK:
690         case ACPI_NOTIFY_DEVICE_CHECK:
691                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
692                 "Processor driver received %s event\n",
693                        (event == ACPI_NOTIFY_BUS_CHECK) ?
694                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
695
696                 if (!is_processor_present(handle))
697                         break;
698
699                 if (acpi_bus_get_device(handle, &device)) {
700                         result = acpi_processor_device_add(handle, &device);
701                         if (result)
702                                 printk(KERN_ERR PREFIX
703                                             "Unable to add the device\n");
704                         break;
705                 }
706                 break;
707         case ACPI_NOTIFY_EJECT_REQUEST:
708                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
709                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
710
711                 if (acpi_bus_get_device(handle, &device)) {
712                         printk(KERN_ERR PREFIX
713                                     "Device don't exist, dropping EJECT\n");
714                         break;
715                 }
716                 pr = acpi_driver_data(device);
717                 if (!pr) {
718                         printk(KERN_ERR PREFIX
719                                     "Driver data is NULL, dropping EJECT\n");
720                         return;
721                 }
722                 break;
723         default:
724                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
725                                   "Unsupported event [0x%x]\n", event));
726                 break;
727         }
728
729         return;
730 }
731
732 static acpi_status
733 processor_walk_namespace_cb(acpi_handle handle,
734                             u32 lvl, void *context, void **rv)
735 {
736         acpi_status status;
737         int *action = context;
738         acpi_object_type type = 0;
739
740         status = acpi_get_type(handle, &type);
741         if (ACPI_FAILURE(status))
742                 return (AE_OK);
743
744         if (type != ACPI_TYPE_PROCESSOR)
745                 return (AE_OK);
746
747         switch (*action) {
748         case INSTALL_NOTIFY_HANDLER:
749                 acpi_install_notify_handler(handle,
750                                             ACPI_SYSTEM_NOTIFY,
751                                             acpi_processor_hotplug_notify,
752                                             NULL);
753                 break;
754         case UNINSTALL_NOTIFY_HANDLER:
755                 acpi_remove_notify_handler(handle,
756                                            ACPI_SYSTEM_NOTIFY,
757                                            acpi_processor_hotplug_notify);
758                 break;
759         default:
760                 break;
761         }
762
763         return (AE_OK);
764 }
765
766 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
767 {
768
769         if (!is_processor_present(handle)) {
770                 return AE_ERROR;
771         }
772
773         if (acpi_map_lsapic(handle, p_cpu))
774                 return AE_ERROR;
775
776         if (arch_register_cpu(*p_cpu)) {
777                 acpi_unmap_lsapic(*p_cpu);
778                 return AE_ERROR;
779         }
780
781         return AE_OK;
782 }
783
784 static int acpi_processor_handle_eject(struct acpi_processor *pr)
785 {
786         if (cpu_online(pr->id))
787                 cpu_down(pr->id);
788
789         arch_unregister_cpu(pr->id);
790         acpi_unmap_lsapic(pr->id);
791         return (0);
792 }
793 #else
794 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
795 {
796         return AE_ERROR;
797 }
798 static int acpi_processor_handle_eject(struct acpi_processor *pr)
799 {
800         return (-EINVAL);
801 }
802 #endif
803
804 static
805 void acpi_processor_install_hotplug_notify(void)
806 {
807 #ifdef CONFIG_ACPI_HOTPLUG_CPU
808         int action = INSTALL_NOTIFY_HANDLER;
809         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
810                             ACPI_ROOT_OBJECT,
811                             ACPI_UINT32_MAX,
812                             processor_walk_namespace_cb, NULL, &action, NULL);
813 #endif
814         register_hotcpu_notifier(&acpi_cpu_notifier);
815 }
816
817 static
818 void acpi_processor_uninstall_hotplug_notify(void)
819 {
820 #ifdef CONFIG_ACPI_HOTPLUG_CPU
821         int action = UNINSTALL_NOTIFY_HANDLER;
822         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
823                             ACPI_ROOT_OBJECT,
824                             ACPI_UINT32_MAX,
825                             processor_walk_namespace_cb, NULL, &action, NULL);
826 #endif
827         unregister_hotcpu_notifier(&acpi_cpu_notifier);
828 }
829
830 /*
831  * We keep the driver loaded even when ACPI is not running.
832  * This is needed for the powernow-k8 driver, that works even without
833  * ACPI, but needs symbols from this driver
834  */
835
836 static int __init acpi_processor_init(void)
837 {
838         int result = 0;
839
840         if (acpi_disabled)
841                 return 0;
842
843         memset(&errata, 0, sizeof(errata));
844
845         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
846         if (!acpi_processor_dir)
847                 return -ENOMEM;
848
849         if (!cpuidle_register_driver(&acpi_idle_driver)) {
850                 printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",
851                         acpi_idle_driver.name);
852         } else {
853                 printk(KERN_DEBUG "ACPI: acpi_idle yielding to %s\n",
854                         cpuidle_get_driver()->name);
855         }
856
857         result = acpi_bus_register_driver(&acpi_processor_driver);
858         if (result < 0)
859                 goto out_cpuidle;
860
861         acpi_processor_install_hotplug_notify();
862
863         acpi_thermal_cpufreq_init();
864
865         acpi_processor_ppc_init();
866
867         acpi_processor_throttling_init();
868
869         return 0;
870
871 out_cpuidle:
872         cpuidle_unregister_driver(&acpi_idle_driver);
873
874         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
875
876         return result;
877 }
878
879 static void __exit acpi_processor_exit(void)
880 {
881         if (acpi_disabled)
882                 return;
883
884         acpi_processor_ppc_exit();
885
886         acpi_thermal_cpufreq_exit();
887
888         acpi_processor_uninstall_hotplug_notify();
889
890         acpi_bus_unregister_driver(&acpi_processor_driver);
891
892         cpuidle_unregister_driver(&acpi_idle_driver);
893
894         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
895
896         return;
897 }
898
899 module_init(acpi_processor_init);
900 module_exit(acpi_processor_exit);
901
902 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
903
904 MODULE_ALIAS("processor");