ACPICA: use new ACPI headers.
[linux-2.6.git] / drivers / acpi / processor_core.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
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 ACPI_PROCESSOR_COMPONENT        0x01000000
62 #define ACPI_PROCESSOR_CLASS            "processor"
63 #define ACPI_PROCESSOR_DRIVER_NAME      "ACPI Processor Driver"
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
71 #define ACPI_PROCESSOR_LIMIT_USER       0
72 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
73
74 #define ACPI_STA_PRESENT 0x00000001
75
76 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
77 ACPI_MODULE_NAME("acpi_processor")
78
79     MODULE_AUTHOR("Paul Diefenbaugh");
80 MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
81 MODULE_LICENSE("GPL");
82
83 static int acpi_processor_add(struct acpi_device *device);
84 static int acpi_processor_start(struct acpi_device *device);
85 static int acpi_processor_remove(struct acpi_device *device, int type);
86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
87 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
88 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
89 static int acpi_processor_handle_eject(struct acpi_processor *pr);
90
91 static struct acpi_driver acpi_processor_driver = {
92         .name = ACPI_PROCESSOR_DRIVER_NAME,
93         .class = ACPI_PROCESSOR_CLASS,
94         .ids = ACPI_PROCESSOR_HID,
95         .ops = {
96                 .add = acpi_processor_add,
97                 .remove = acpi_processor_remove,
98                 .start = acpi_processor_start,
99                 },
100 };
101
102 #define INSTALL_NOTIFY_HANDLER          1
103 #define UNINSTALL_NOTIFY_HANDLER        2
104
105 static const struct file_operations acpi_processor_info_fops = {
106         .open = acpi_processor_info_open_fs,
107         .read = seq_read,
108         .llseek = seq_lseek,
109         .release = single_release,
110 };
111
112 struct acpi_processor *processors[NR_CPUS];
113 struct acpi_processor_errata errata __read_mostly;
114
115 /* --------------------------------------------------------------------------
116                                 Errata Handling
117    -------------------------------------------------------------------------- */
118
119 static int acpi_processor_errata_piix4(struct pci_dev *dev)
120 {
121         u8 rev = 0;
122         u8 value1 = 0;
123         u8 value2 = 0;
124
125
126         if (!dev)
127                 return -EINVAL;
128
129         /*
130          * Note that 'dev' references the PIIX4 ACPI Controller.
131          */
132
133         pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
134
135         switch (rev) {
136         case 0:
137                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
138                 break;
139         case 1:
140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
141                 break;
142         case 2:
143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
144                 break;
145         case 3:
146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
147                 break;
148         default:
149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
150                 break;
151         }
152
153         switch (rev) {
154
155         case 0:         /* PIIX4 A-step */
156         case 1:         /* PIIX4 B-step */
157                 /*
158                  * See specification changes #13 ("Manual Throttle Duty Cycle")
159                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
160                  * erratum #5 ("STPCLK# Deassertion Time") from the January
161                  * 2002 PIIX4 specification update.  Applies to only older
162                  * PIIX4 models.
163                  */
164                 errata.piix4.throttle = 1;
165
166         case 2:         /* PIIX4E */
167         case 3:         /* PIIX4M */
168                 /*
169                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
170                  * Livelock") from the January 2002 PIIX4 specification update.
171                  * Applies to all PIIX4 models.
172                  */
173
174                 /*
175                  * BM-IDE
176                  * ------
177                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
178                  * Status register address.  We'll use this later to read
179                  * each IDE controller's DMA status to make sure we catch all
180                  * DMA activity.
181                  */
182                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
183                                      PCI_DEVICE_ID_INTEL_82371AB,
184                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
185                 if (dev) {
186                         errata.piix4.bmisx = pci_resource_start(dev, 4);
187                         pci_dev_put(dev);
188                 }
189
190                 /*
191                  * Type-F DMA
192                  * ----------
193                  * Find the PIIX4 ISA Controller and read the Motherboard
194                  * DMA controller's status to see if Type-F (Fast) DMA mode
195                  * is enabled (bit 7) on either channel.  Note that we'll
196                  * disable C3 support if this is enabled, as some legacy
197                  * devices won't operate well if fast DMA is disabled.
198                  */
199                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
200                                      PCI_DEVICE_ID_INTEL_82371AB_0,
201                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
202                 if (dev) {
203                         pci_read_config_byte(dev, 0x76, &value1);
204                         pci_read_config_byte(dev, 0x77, &value2);
205                         if ((value1 & 0x80) || (value2 & 0x80))
206                                 errata.piix4.fdma = 1;
207                         pci_dev_put(dev);
208                 }
209
210                 break;
211         }
212
213         if (errata.piix4.bmisx)
214                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
215                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
216         if (errata.piix4.fdma)
217                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
218                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
219
220         return 0;
221 }
222
223 static int acpi_processor_errata(struct acpi_processor *pr)
224 {
225         int result = 0;
226         struct pci_dev *dev = NULL;
227
228
229         if (!pr)
230                 return -EINVAL;
231
232         /*
233          * PIIX4
234          */
235         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
236                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
237                              PCI_ANY_ID, NULL);
238         if (dev) {
239                 result = acpi_processor_errata_piix4(dev);
240                 pci_dev_put(dev);
241         }
242
243         return result;
244 }
245
246 /* --------------------------------------------------------------------------
247                               Common ACPI processor functions
248    -------------------------------------------------------------------------- */
249
250 /*
251  * _PDC is required for a BIOS-OS handshake for most of the newer
252  * ACPI processor features.
253  */
254 static int acpi_processor_set_pdc(struct acpi_processor *pr)
255 {
256         struct acpi_object_list *pdc_in = pr->pdc;
257         acpi_status status = AE_OK;
258
259
260         if (!pdc_in)
261                 return status;
262
263         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
264
265         if (ACPI_FAILURE(status))
266                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
267                     "Could not evaluate _PDC, using legacy perf. control...\n"));
268
269         return status;
270 }
271
272 /* --------------------------------------------------------------------------
273                               FS Interface (/proc)
274    -------------------------------------------------------------------------- */
275
276 static struct proc_dir_entry *acpi_processor_dir = NULL;
277
278 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
279 {
280         struct acpi_processor *pr = seq->private;
281
282
283         if (!pr)
284                 goto end;
285
286         seq_printf(seq, "processor id:            %d\n"
287                    "acpi id:                 %d\n"
288                    "bus mastering control:   %s\n"
289                    "power management:        %s\n"
290                    "throttling control:      %s\n"
291                    "limit interface:         %s\n",
292                    pr->id,
293                    pr->acpi_id,
294                    pr->flags.bm_control ? "yes" : "no",
295                    pr->flags.power ? "yes" : "no",
296                    pr->flags.throttling ? "yes" : "no",
297                    pr->flags.limit ? "yes" : "no");
298
299       end:
300         return 0;
301 }
302
303 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
304 {
305         return single_open(file, acpi_processor_info_seq_show,
306                            PDE(inode)->data);
307 }
308
309 static int acpi_processor_add_fs(struct acpi_device *device)
310 {
311         struct proc_dir_entry *entry = NULL;
312
313
314         if (!acpi_device_dir(device)) {
315                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
316                                                      acpi_processor_dir);
317                 if (!acpi_device_dir(device))
318                         return -ENODEV;
319         }
320         acpi_device_dir(device)->owner = THIS_MODULE;
321
322         /* 'info' [R] */
323         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
324                                   S_IRUGO, acpi_device_dir(device));
325         if (!entry)
326                 return -EIO;
327         else {
328                 entry->proc_fops = &acpi_processor_info_fops;
329                 entry->data = acpi_driver_data(device);
330                 entry->owner = THIS_MODULE;
331         }
332
333         /* 'throttling' [R/W] */
334         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
335                                   S_IFREG | S_IRUGO | S_IWUSR,
336                                   acpi_device_dir(device));
337         if (!entry)
338                 return -EIO;
339         else {
340                 entry->proc_fops = &acpi_processor_throttling_fops;
341                 entry->data = acpi_driver_data(device);
342                 entry->owner = THIS_MODULE;
343         }
344
345         /* 'limit' [R/W] */
346         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
347                                   S_IFREG | S_IRUGO | S_IWUSR,
348                                   acpi_device_dir(device));
349         if (!entry)
350                 return -EIO;
351         else {
352                 entry->proc_fops = &acpi_processor_limit_fops;
353                 entry->data = acpi_driver_data(device);
354                 entry->owner = THIS_MODULE;
355         }
356
357         return 0;
358 }
359
360 static int acpi_processor_remove_fs(struct acpi_device *device)
361 {
362
363         if (acpi_device_dir(device)) {
364                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
365                                   acpi_device_dir(device));
366                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
367                                   acpi_device_dir(device));
368                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
369                                   acpi_device_dir(device));
370                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
371                 acpi_device_dir(device) = NULL;
372         }
373
374         return 0;
375 }
376
377 /* Use the acpiid in MADT to map cpus in case of SMP */
378 #ifndef CONFIG_SMP
379 #define convert_acpiid_to_cpu(acpi_id) (-1)
380 #else
381
382 #ifdef CONFIG_IA64
383 #define arch_acpiid_to_apicid   ia64_acpiid_to_sapicid
384 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
385 #define ARCH_BAD_APICID         (0xffff)
386 #else
387 #define arch_acpiid_to_apicid   x86_acpiid_to_apicid
388 #define arch_cpu_to_apicid      x86_cpu_to_apicid
389 #define ARCH_BAD_APICID         (0xff)
390 #endif
391
392 static int convert_acpiid_to_cpu(u8 acpi_id)
393 {
394         u16 apic_id;
395         int i;
396
397         apic_id = arch_acpiid_to_apicid[acpi_id];
398         if (apic_id == ARCH_BAD_APICID)
399                 return -1;
400
401         for (i = 0; i < NR_CPUS; i++) {
402                 if (arch_cpu_to_apicid[i] == apic_id)
403                         return i;
404         }
405         return -1;
406 }
407 #endif
408
409 /* --------------------------------------------------------------------------
410                                  Driver Interface
411    -------------------------------------------------------------------------- */
412
413 static int acpi_processor_get_info(struct acpi_processor *pr)
414 {
415         acpi_status status = 0;
416         union acpi_object object = { 0 };
417         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
418         int cpu_index;
419         static int cpu0_initialized;
420
421
422         if (!pr)
423                 return -EINVAL;
424
425         if (num_online_cpus() > 1)
426                 errata.smp = TRUE;
427
428         acpi_processor_errata(pr);
429
430         /*
431          * Check to see if we have bus mastering arbitration control.  This
432          * is required for proper C3 usage (to maintain cache coherency).
433          */
434         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
435                 pr->flags.bm_control = 1;
436                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
437                                   "Bus mastering arbitration control present\n"));
438         } else
439                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
440                                   "No bus mastering arbitration control\n"));
441
442         /*
443          * Evalute the processor object.  Note that it is common on SMP to
444          * have the first (boot) processor with a valid PBLK address while
445          * all others have a NULL address.
446          */
447         status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
448         if (ACPI_FAILURE(status)) {
449                 printk(KERN_ERR PREFIX "Evaluating processor object\n");
450                 return -ENODEV;
451         }
452
453         /*
454          * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
455          *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
456          */
457         pr->acpi_id = object.processor.proc_id;
458
459         cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
460
461         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
462         if (!cpu0_initialized && (cpu_index == -1) &&
463             (num_online_cpus() == 1)) {
464                 cpu_index = 0;
465         }
466
467         cpu0_initialized = 1;
468
469         pr->id = cpu_index;
470
471         /*
472          *  Extra Processor objects may be enumerated on MP systems with
473          *  less than the max # of CPUs. They should be ignored _iff
474          *  they are physically not present.
475          */
476         if (cpu_index == -1) {
477                 if (ACPI_FAILURE
478                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
479                         return -ENODEV;
480                 }
481         }
482
483         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
484                           pr->acpi_id));
485
486         if (!object.processor.pblk_address)
487                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
488         else if (object.processor.pblk_length != 6)
489                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
490                             object.processor.pblk_length);
491         else {
492                 pr->throttling.address = object.processor.pblk_address;
493                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
494                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
495
496                 pr->pblk = object.processor.pblk_address;
497
498                 /*
499                  * We don't care about error returns - we just try to mark
500                  * these reserved so that nobody else is confused into thinking
501                  * that this region might be unused..
502                  *
503                  * (In particular, allocating the IO range for Cardbus)
504                  */
505                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
506         }
507
508 #ifdef CONFIG_CPU_FREQ
509         acpi_processor_ppc_has_changed(pr);
510 #endif
511         acpi_processor_get_throttling_info(pr);
512         acpi_processor_get_limit_info(pr);
513
514         return 0;
515 }
516
517 static void *processor_device_array[NR_CPUS];
518
519 static int __cpuinit acpi_processor_start(struct acpi_device *device)
520 {
521         int result = 0;
522         acpi_status status = AE_OK;
523         struct acpi_processor *pr;
524
525
526         pr = acpi_driver_data(device);
527
528         result = acpi_processor_get_info(pr);
529         if (result) {
530                 /* Processor is physically not present */
531                 return 0;
532         }
533
534         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
535
536         /*
537          * Buggy BIOS check
538          * ACPI id of processors can be reported wrongly by the BIOS.
539          * Don't trust it blindly
540          */
541         if (processor_device_array[pr->id] != NULL &&
542             processor_device_array[pr->id] != device) {
543                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
544                         "for the processor\n");
545                 return -ENODEV;
546         }
547         processor_device_array[pr->id] = device;
548
549         processors[pr->id] = pr;
550
551         result = acpi_processor_add_fs(device);
552         if (result)
553                 goto end;
554
555         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
556                                              acpi_processor_notify, pr);
557
558         /* _PDC call should be done before doing anything else (if reqd.). */
559         arch_acpi_processor_init_pdc(pr);
560         acpi_processor_set_pdc(pr);
561
562         acpi_processor_power_init(pr, device);
563
564         if (pr->flags.throttling) {
565                 printk(KERN_INFO PREFIX "%s [%s] (supports",
566                        acpi_device_name(device), acpi_device_bid(device));
567                 printk(" %d throttling states", pr->throttling.state_count);
568                 printk(")\n");
569         }
570
571       end:
572
573         return result;
574 }
575
576 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
577 {
578         struct acpi_processor *pr = data;
579         struct acpi_device *device = NULL;
580
581
582         if (!pr)
583                 return;
584
585         if (acpi_bus_get_device(pr->handle, &device))
586                 return;
587
588         switch (event) {
589         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
590                 acpi_processor_ppc_has_changed(pr);
591                 acpi_bus_generate_event(device, event,
592                                         pr->performance_platform_limit);
593                 break;
594         case ACPI_PROCESSOR_NOTIFY_POWER:
595                 acpi_processor_cst_has_changed(pr);
596                 acpi_bus_generate_event(device, event, 0);
597                 break;
598         default:
599                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
600                                   "Unsupported event [0x%x]\n", event));
601                 break;
602         }
603
604         return;
605 }
606
607 static int acpi_processor_add(struct acpi_device *device)
608 {
609         struct acpi_processor *pr = NULL;
610
611
612         if (!device)
613                 return -EINVAL;
614
615         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
616         if (!pr)
617                 return -ENOMEM;
618
619         pr->handle = device->handle;
620         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
621         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
622         acpi_driver_data(device) = pr;
623
624         return 0;
625 }
626
627 static int acpi_processor_remove(struct acpi_device *device, int type)
628 {
629         acpi_status status = AE_OK;
630         struct acpi_processor *pr = NULL;
631
632
633         if (!device || !acpi_driver_data(device))
634                 return -EINVAL;
635
636         pr = acpi_driver_data(device);
637
638         if (pr->id >= NR_CPUS) {
639                 kfree(pr);
640                 return 0;
641         }
642
643         if (type == ACPI_BUS_REMOVAL_EJECT) {
644                 if (acpi_processor_handle_eject(pr))
645                         return -EINVAL;
646         }
647
648         acpi_processor_power_exit(pr, device);
649
650         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
651                                             acpi_processor_notify);
652
653         acpi_processor_remove_fs(device);
654
655         processors[pr->id] = NULL;
656
657         kfree(pr);
658
659         return 0;
660 }
661
662 #ifdef CONFIG_ACPI_HOTPLUG_CPU
663 /****************************************************************************
664  *      Acpi processor hotplug support                                      *
665  ****************************************************************************/
666
667 static int is_processor_present(acpi_handle handle);
668
669 static int is_processor_present(acpi_handle handle)
670 {
671         acpi_status status;
672         unsigned long sta = 0;
673
674
675         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
676         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
677                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
678                 return 0;
679         }
680         return 1;
681 }
682
683 static
684 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
685 {
686         acpi_handle phandle;
687         struct acpi_device *pdev;
688         struct acpi_processor *pr;
689
690
691         if (acpi_get_parent(handle, &phandle)) {
692                 return -ENODEV;
693         }
694
695         if (acpi_bus_get_device(phandle, &pdev)) {
696                 return -ENODEV;
697         }
698
699         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
700                 return -ENODEV;
701         }
702
703         acpi_bus_start(*device);
704
705         pr = acpi_driver_data(*device);
706         if (!pr)
707                 return -ENODEV;
708
709         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
710                 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
711         }
712         return 0;
713 }
714
715 static void
716 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
717 {
718         struct acpi_processor *pr;
719         struct acpi_device *device = NULL;
720         int result;
721
722
723         switch (event) {
724         case ACPI_NOTIFY_BUS_CHECK:
725         case ACPI_NOTIFY_DEVICE_CHECK:
726                 printk("Processor driver received %s event\n",
727                        (event == ACPI_NOTIFY_BUS_CHECK) ?
728                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
729
730                 if (!is_processor_present(handle))
731                         break;
732
733                 if (acpi_bus_get_device(handle, &device)) {
734                         result = acpi_processor_device_add(handle, &device);
735                         if (result)
736                                 printk(KERN_ERR PREFIX
737                                             "Unable to add the device\n");
738                         break;
739                 }
740
741                 pr = acpi_driver_data(device);
742                 if (!pr) {
743                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
744                         break;
745                 }
746
747                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
748                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
749                         break;
750                 }
751
752                 result = acpi_processor_start(device);
753                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
754                         kobject_uevent(&device->kobj, KOBJ_ONLINE);
755                 } else {
756                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
757                                     acpi_device_bid(device));
758                 }
759                 break;
760         case ACPI_NOTIFY_EJECT_REQUEST:
761                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
762                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
763
764                 if (acpi_bus_get_device(handle, &device)) {
765                         printk(KERN_ERR PREFIX
766                                     "Device don't exist, dropping EJECT\n");
767                         break;
768                 }
769                 pr = acpi_driver_data(device);
770                 if (!pr) {
771                         printk(KERN_ERR PREFIX
772                                     "Driver data is NULL, dropping EJECT\n");
773                         return;
774                 }
775
776                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
777                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
778                 break;
779         default:
780                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
781                                   "Unsupported event [0x%x]\n", event));
782                 break;
783         }
784
785         return;
786 }
787
788 static acpi_status
789 processor_walk_namespace_cb(acpi_handle handle,
790                             u32 lvl, void *context, void **rv)
791 {
792         acpi_status status;
793         int *action = context;
794         acpi_object_type type = 0;
795
796         status = acpi_get_type(handle, &type);
797         if (ACPI_FAILURE(status))
798                 return (AE_OK);
799
800         if (type != ACPI_TYPE_PROCESSOR)
801                 return (AE_OK);
802
803         switch (*action) {
804         case INSTALL_NOTIFY_HANDLER:
805                 acpi_install_notify_handler(handle,
806                                             ACPI_SYSTEM_NOTIFY,
807                                             acpi_processor_hotplug_notify,
808                                             NULL);
809                 break;
810         case UNINSTALL_NOTIFY_HANDLER:
811                 acpi_remove_notify_handler(handle,
812                                            ACPI_SYSTEM_NOTIFY,
813                                            acpi_processor_hotplug_notify);
814                 break;
815         default:
816                 break;
817         }
818
819         return (AE_OK);
820 }
821
822 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
823 {
824
825         if (!is_processor_present(handle)) {
826                 return AE_ERROR;
827         }
828
829         if (acpi_map_lsapic(handle, p_cpu))
830                 return AE_ERROR;
831
832         if (arch_register_cpu(*p_cpu)) {
833                 acpi_unmap_lsapic(*p_cpu);
834                 return AE_ERROR;
835         }
836
837         return AE_OK;
838 }
839
840 static int acpi_processor_handle_eject(struct acpi_processor *pr)
841 {
842         if (cpu_online(pr->id)) {
843                 return (-EINVAL);
844         }
845         arch_unregister_cpu(pr->id);
846         acpi_unmap_lsapic(pr->id);
847         return (0);
848 }
849 #else
850 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
851 {
852         return AE_ERROR;
853 }
854 static int acpi_processor_handle_eject(struct acpi_processor *pr)
855 {
856         return (-EINVAL);
857 }
858 #endif
859
860 static
861 void acpi_processor_install_hotplug_notify(void)
862 {
863 #ifdef CONFIG_ACPI_HOTPLUG_CPU
864         int action = INSTALL_NOTIFY_HANDLER;
865         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
866                             ACPI_ROOT_OBJECT,
867                             ACPI_UINT32_MAX,
868                             processor_walk_namespace_cb, &action, NULL);
869 #endif
870 }
871
872 static
873 void acpi_processor_uninstall_hotplug_notify(void)
874 {
875 #ifdef CONFIG_ACPI_HOTPLUG_CPU
876         int action = UNINSTALL_NOTIFY_HANDLER;
877         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
878                             ACPI_ROOT_OBJECT,
879                             ACPI_UINT32_MAX,
880                             processor_walk_namespace_cb, &action, NULL);
881 #endif
882 }
883
884 /*
885  * We keep the driver loaded even when ACPI is not running.
886  * This is needed for the powernow-k8 driver, that works even without
887  * ACPI, but needs symbols from this driver
888  */
889
890 static int __init acpi_processor_init(void)
891 {
892         int result = 0;
893
894
895         memset(&processors, 0, sizeof(processors));
896         memset(&errata, 0, sizeof(errata));
897
898         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
899         if (!acpi_processor_dir)
900                 return -ENOMEM;
901         acpi_processor_dir->owner = THIS_MODULE;
902
903         result = acpi_bus_register_driver(&acpi_processor_driver);
904         if (result < 0) {
905                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
906                 return result;
907         }
908
909         acpi_processor_install_hotplug_notify();
910
911         acpi_thermal_cpufreq_init();
912
913         acpi_processor_ppc_init();
914
915         return 0;
916 }
917
918 static void __exit acpi_processor_exit(void)
919 {
920
921         acpi_processor_ppc_exit();
922
923         acpi_thermal_cpufreq_exit();
924
925         acpi_processor_uninstall_hotplug_notify();
926
927         acpi_bus_unregister_driver(&acpi_processor_driver);
928
929         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
930
931         return;
932 }
933
934 module_init(acpi_processor_init);
935 module_exit(acpi_processor_exit);
936
937 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
938
939 MODULE_ALIAS("processor");