ACPI: processor: move acpi_get_cpuid into processor_core.c
[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/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
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>
57
58 #include <acpi/acpi_bus.h>
59 #include <acpi/acpi_drivers.h>
60 #include <acpi/processor.h>
61
62 #define PREFIX "ACPI: "
63
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
72
73 #define ACPI_PROCESSOR_LIMIT_USER       0
74 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
75
76 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
77 ACPI_MODULE_NAME("processor_driver");
78
79 MODULE_AUTHOR("Paul Diefenbaugh");
80 MODULE_DESCRIPTION("ACPI Processor Driver");
81 MODULE_LICENSE("GPL");
82
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);
91
92
93 static const struct acpi_device_id processor_device_ids[] = {
94         {ACPI_PROCESSOR_OBJECT_HID, 0},
95         {"ACPI0007", 0},
96         {"", 0},
97 };
98 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
99
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,
110                 },
111 };
112
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,
122 };
123 #endif
124
125 DEFINE_PER_CPU(struct acpi_processor *, processors);
126 EXPORT_PER_CPU_SYMBOL(processors);
127
128 struct acpi_processor_errata errata __read_mostly;
129
130 /* --------------------------------------------------------------------------
131                                 Errata Handling
132    -------------------------------------------------------------------------- */
133
134 static int acpi_processor_errata_piix4(struct pci_dev *dev)
135 {
136         u8 value1 = 0;
137         u8 value2 = 0;
138
139
140         if (!dev)
141                 return -EINVAL;
142
143         /*
144          * Note that 'dev' references the PIIX4 ACPI Controller.
145          */
146
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;
163         }
164
165         switch (dev->revision) {
166
167         case 0:         /* PIIX4 A-step */
168         case 1:         /* PIIX4 B-step */
169                 /*
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.
175                  */
176                 errata.piix4.throttle = 1;
177
178         case 2:         /* PIIX4E */
179         case 3:         /* PIIX4M */
180                 /*
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.
184                  */
185
186                 /*
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.
193                  */
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);
200                 }
201
202                 /*
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.
210                  */
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);
220                 }
221
222                 break;
223         }
224
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"));
231
232         return 0;
233 }
234
235 static int acpi_processor_errata(struct acpi_processor *pr)
236 {
237         int result = 0;
238         struct pci_dev *dev = NULL;
239
240
241         if (!pr)
242                 return -EINVAL;
243
244         /*
245          * PIIX4
246          */
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);
253         }
254
255         return result;
256 }
257
258 /* --------------------------------------------------------------------------
259                               FS Interface (/proc)
260    -------------------------------------------------------------------------- */
261
262 #ifdef CONFIG_ACPI_PROCFS
263 static struct proc_dir_entry *acpi_processor_dir = NULL;
264
265 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
266 {
267         struct acpi_processor *pr = seq->private;
268
269
270         if (!pr)
271                 goto end;
272
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");
285
286       end:
287         return 0;
288 }
289
290 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
291 {
292         return single_open(file, acpi_processor_info_seq_show,
293                            PDE(inode)->data);
294 }
295
296 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
297 {
298         struct proc_dir_entry *entry = NULL;
299
300
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;
306         }
307
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;
315
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;
324
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;
334 }
335 static int acpi_processor_remove_fs(struct acpi_device *device)
336 {
337
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;
347         }
348
349         return 0;
350 }
351 #else
352 static inline int acpi_processor_add_fs(struct acpi_device *device)
353 {
354         return 0;
355 }
356 static inline int acpi_processor_remove_fs(struct acpi_device *device)
357 {
358         return 0;
359 }
360 #endif
361
362 /* --------------------------------------------------------------------------
363                                  Driver Interface
364    -------------------------------------------------------------------------- */
365
366 static int acpi_processor_get_info(struct acpi_device *device)
367 {
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;
374
375         pr = acpi_driver_data(device);
376         if (!pr)
377                 return -EINVAL;
378
379         if (num_online_cpus() > 1)
380                 errata.smp = TRUE;
381
382         acpi_processor_errata(pr);
383
384         /*
385          * Check to see if we have bus mastering arbitration control.  This
386          * is required for proper C3 usage (to maintain cache coherency).
387          */
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"));
395
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;
402                 }
403
404                 /*
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
408                  */
409                 pr->acpi_id = object.processor.proc_id;
410         } else {
411                 /*
412                  * Declared with "Device" statement; match _UID.
413                  * Note that we don't handle string _UIDs yet.
414                  */
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;
422                 }
423                 device_declaration = 1;
424                 pr->acpi_id = value;
425         }
426         cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
427
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;
432         }
433
434         cpu0_initialized = 1;
435
436         pr->id = cpu_index;
437
438         /*
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.
442          */
443         if (pr->id == -1) {
444                 if (ACPI_FAILURE
445                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
446                         return -ENODEV;
447                 }
448         }
449         /*
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.
457          */
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));
461
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;
471
472                 pr->pblk = object.processor.pblk_address;
473
474                 /*
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..
478                  *
479                  * (In particular, allocating the IO range for Cardbus)
480                  */
481                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
482         }
483
484         /*
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
488          */
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);
492
493         return 0;
494 }
495
496 static DEFINE_PER_CPU(void *, processor_device_array);
497
498 static void acpi_processor_notify(struct acpi_device *device, u32 event)
499 {
500         struct acpi_processor *pr = acpi_driver_data(device);
501         int saved;
502
503         if (!pr)
504                 return;
505
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;
533         }
534
535         return;
536 }
537
538 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
539                 unsigned long action, void *hcpu)
540 {
541         unsigned int cpu = (unsigned long)hcpu;
542         struct acpi_processor *pr = per_cpu(processors, cpu);
543
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);
548         }
549         return NOTIFY_OK;
550 }
551
552 static struct notifier_block acpi_cpu_notifier =
553 {
554             .notifier_call = acpi_cpu_soft_notify,
555 };
556
557 static int __cpuinit acpi_processor_add(struct acpi_device *device)
558 {
559         struct acpi_processor *pr = NULL;
560         int result = 0;
561         struct sys_device *sysdev;
562
563         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
564         if (!pr)
565                 return -ENOMEM;
566
567         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
568                 kfree(pr);
569                 return -ENOMEM;
570         }
571
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;
576
577         result = acpi_processor_get_info(device);
578         if (result) {
579                 /* Processor is physically not present */
580                 return 0;
581         }
582
583         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
584
585         /*
586          * Buggy BIOS check
587          * ACPI id of processors can be reported wrongly by the BIOS.
588          * Don't trust it blindly
589          */
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;
596         }
597         per_cpu(processor_device_array, pr->id) = device;
598
599         per_cpu(processors, pr->id) = pr;
600
601         result = acpi_processor_add_fs(device);
602         if (result)
603                 goto err_free_cpumask;
604
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;
609         }
610
611         /* _PDC call should be done before doing anything else (if reqd.). */
612         acpi_processor_set_pdc(pr->handle);
613
614 #ifdef CONFIG_CPU_FREQ
615         acpi_processor_ppc_has_changed(pr, 0);
616 #endif
617         acpi_processor_get_throttling_info(pr);
618         acpi_processor_get_limit_info(pr);
619
620
621         acpi_processor_power_init(pr, device);
622
623         pr->cdev = thermal_cooling_device_register("Processor", device,
624                                                 &processor_cooling_ops);
625         if (IS_ERR(pr->cdev)) {
626                 result = PTR_ERR(pr->cdev);
627                 goto err_power_exit;
628         }
629
630         dev_dbg(&device->dev, "registered as cooling_device%d\n",
631                  pr->cdev->id);
632
633         result = sysfs_create_link(&device->dev.kobj,
634                                    &pr->cdev->device.kobj,
635                                    "thermal_cooling");
636         if (result) {
637                 printk(KERN_ERR PREFIX "Create sysfs link\n");
638                 goto err_thermal_unregister;
639         }
640         result = sysfs_create_link(&pr->cdev->device.kobj,
641                                    &device->dev.kobj,
642                                    "device");
643         if (result) {
644                 printk(KERN_ERR PREFIX "Create sysfs link\n");
645                 goto err_remove_sysfs;
646         }
647
648         return 0;
649
650 err_remove_sysfs:
651         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
652 err_thermal_unregister:
653         thermal_cooling_device_unregister(pr->cdev);
654 err_power_exit:
655         acpi_processor_power_exit(pr, device);
656 err_remove_fs:
657         acpi_processor_remove_fs(device);
658 err_free_cpumask:
659         free_cpumask_var(pr->throttling.shared_cpu_map);
660
661         return result;
662 }
663
664 static int acpi_processor_remove(struct acpi_device *device, int type)
665 {
666         struct acpi_processor *pr = NULL;
667
668
669         if (!device || !acpi_driver_data(device))
670                 return -EINVAL;
671
672         pr = acpi_driver_data(device);
673
674         if (pr->id >= nr_cpu_ids)
675                 goto free;
676
677         if (type == ACPI_BUS_REMOVAL_EJECT) {
678                 if (acpi_processor_handle_eject(pr))
679                         return -EINVAL;
680         }
681
682         acpi_processor_power_exit(pr, device);
683
684         sysfs_remove_link(&device->dev.kobj, "sysdev");
685
686         acpi_processor_remove_fs(device);
687
688         if (pr->cdev) {
689                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
690                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
691                 thermal_cooling_device_unregister(pr->cdev);
692                 pr->cdev = NULL;
693         }
694
695         per_cpu(processors, pr->id) = NULL;
696         per_cpu(processor_device_array, pr->id) = NULL;
697
698 free:
699         free_cpumask_var(pr->throttling.shared_cpu_map);
700         kfree(pr);
701
702         return 0;
703 }
704
705 #ifdef CONFIG_ACPI_HOTPLUG_CPU
706 /****************************************************************************
707  *      Acpi processor hotplug support                                      *
708  ****************************************************************************/
709
710 static int is_processor_present(acpi_handle handle)
711 {
712         acpi_status status;
713         unsigned long long sta = 0;
714
715
716         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
717
718         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
719                 return 1;
720
721         /*
722          * _STA is mandatory for a processor that supports hot plug
723          */
724         if (status == AE_NOT_FOUND)
725                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
726                                 "Processor does not support hot plug\n"));
727         else
728                 ACPI_EXCEPTION((AE_INFO, status,
729                                 "Processor Device is not present"));
730         return 0;
731 }
732
733 static
734 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
735 {
736         acpi_handle phandle;
737         struct acpi_device *pdev;
738
739
740         if (acpi_get_parent(handle, &phandle)) {
741                 return -ENODEV;
742         }
743
744         if (acpi_bus_get_device(phandle, &pdev)) {
745                 return -ENODEV;
746         }
747
748         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
749                 return -ENODEV;
750         }
751
752         return 0;
753 }
754
755 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
756                                                 u32 event, void *data)
757 {
758         struct acpi_processor *pr;
759         struct acpi_device *device = NULL;
760         int result;
761
762
763         switch (event) {
764         case ACPI_NOTIFY_BUS_CHECK:
765         case ACPI_NOTIFY_DEVICE_CHECK:
766                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
767                 "Processor driver received %s event\n",
768                        (event == ACPI_NOTIFY_BUS_CHECK) ?
769                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
770
771                 if (!is_processor_present(handle))
772                         break;
773
774                 if (acpi_bus_get_device(handle, &device)) {
775                         result = acpi_processor_device_add(handle, &device);
776                         if (result)
777                                 printk(KERN_ERR PREFIX
778                                             "Unable to add the device\n");
779                         break;
780                 }
781                 break;
782         case ACPI_NOTIFY_EJECT_REQUEST:
783                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
784                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
785
786                 if (acpi_bus_get_device(handle, &device)) {
787                         printk(KERN_ERR PREFIX
788                                     "Device don't exist, dropping EJECT\n");
789                         break;
790                 }
791                 pr = acpi_driver_data(device);
792                 if (!pr) {
793                         printk(KERN_ERR PREFIX
794                                     "Driver data is NULL, dropping EJECT\n");
795                         return;
796                 }
797                 break;
798         default:
799                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
800                                   "Unsupported event [0x%x]\n", event));
801                 break;
802         }
803
804         return;
805 }
806
807 static acpi_status
808 processor_walk_namespace_cb(acpi_handle handle,
809                             u32 lvl, void *context, void **rv)
810 {
811         acpi_status status;
812         int *action = context;
813         acpi_object_type type = 0;
814
815         status = acpi_get_type(handle, &type);
816         if (ACPI_FAILURE(status))
817                 return (AE_OK);
818
819         if (type != ACPI_TYPE_PROCESSOR)
820                 return (AE_OK);
821
822         switch (*action) {
823         case INSTALL_NOTIFY_HANDLER:
824                 acpi_install_notify_handler(handle,
825                                             ACPI_SYSTEM_NOTIFY,
826                                             acpi_processor_hotplug_notify,
827                                             NULL);
828                 break;
829         case UNINSTALL_NOTIFY_HANDLER:
830                 acpi_remove_notify_handler(handle,
831                                            ACPI_SYSTEM_NOTIFY,
832                                            acpi_processor_hotplug_notify);
833                 break;
834         default:
835                 break;
836         }
837
838         return (AE_OK);
839 }
840
841 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
842 {
843
844         if (!is_processor_present(handle)) {
845                 return AE_ERROR;
846         }
847
848         if (acpi_map_lsapic(handle, p_cpu))
849                 return AE_ERROR;
850
851         if (arch_register_cpu(*p_cpu)) {
852                 acpi_unmap_lsapic(*p_cpu);
853                 return AE_ERROR;
854         }
855
856         return AE_OK;
857 }
858
859 static int acpi_processor_handle_eject(struct acpi_processor *pr)
860 {
861         if (cpu_online(pr->id))
862                 cpu_down(pr->id);
863
864         arch_unregister_cpu(pr->id);
865         acpi_unmap_lsapic(pr->id);
866         return (0);
867 }
868 #else
869 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
870 {
871         return AE_ERROR;
872 }
873 static int acpi_processor_handle_eject(struct acpi_processor *pr)
874 {
875         return (-EINVAL);
876 }
877 #endif
878
879 static
880 void acpi_processor_install_hotplug_notify(void)
881 {
882 #ifdef CONFIG_ACPI_HOTPLUG_CPU
883         int action = INSTALL_NOTIFY_HANDLER;
884         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
885                             ACPI_ROOT_OBJECT,
886                             ACPI_UINT32_MAX,
887                             processor_walk_namespace_cb, NULL, &action, NULL);
888 #endif
889         register_hotcpu_notifier(&acpi_cpu_notifier);
890 }
891
892 static
893 void acpi_processor_uninstall_hotplug_notify(void)
894 {
895 #ifdef CONFIG_ACPI_HOTPLUG_CPU
896         int action = UNINSTALL_NOTIFY_HANDLER;
897         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
898                             ACPI_ROOT_OBJECT,
899                             ACPI_UINT32_MAX,
900                             processor_walk_namespace_cb, NULL, &action, NULL);
901 #endif
902         unregister_hotcpu_notifier(&acpi_cpu_notifier);
903 }
904
905 /*
906  * We keep the driver loaded even when ACPI is not running.
907  * This is needed for the powernow-k8 driver, that works even without
908  * ACPI, but needs symbols from this driver
909  */
910
911 static int __init acpi_processor_init(void)
912 {
913         int result = 0;
914
915         if (acpi_disabled)
916                 return 0;
917
918         memset(&errata, 0, sizeof(errata));
919
920 #ifdef CONFIG_ACPI_PROCFS
921         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
922         if (!acpi_processor_dir)
923                 return -ENOMEM;
924 #endif
925         result = cpuidle_register_driver(&acpi_idle_driver);
926         if (result < 0)
927                 goto out_proc;
928
929         result = acpi_bus_register_driver(&acpi_processor_driver);
930         if (result < 0)
931                 goto out_cpuidle;
932
933         acpi_processor_install_hotplug_notify();
934
935         acpi_thermal_cpufreq_init();
936
937         acpi_processor_ppc_init();
938
939         acpi_processor_throttling_init();
940
941         return 0;
942
943 out_cpuidle:
944         cpuidle_unregister_driver(&acpi_idle_driver);
945
946 out_proc:
947 #ifdef CONFIG_ACPI_PROCFS
948         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
949 #endif
950
951         return result;
952 }
953
954 static void __exit acpi_processor_exit(void)
955 {
956         if (acpi_disabled)
957                 return;
958
959         acpi_processor_ppc_exit();
960
961         acpi_thermal_cpufreq_exit();
962
963         acpi_processor_uninstall_hotplug_notify();
964
965         acpi_bus_unregister_driver(&acpi_processor_driver);
966
967         cpuidle_unregister_driver(&acpi_idle_driver);
968
969 #ifdef CONFIG_ACPI_PROCFS
970         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
971 #endif
972
973         return;
974 }
975
976 module_init(acpi_processor_init);
977 module_exit(acpi_processor_exit);
978
979 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
980
981 MODULE_ALIAS("processor");