cpuidle: consolidate 2.6.22 cpuidle branch into one patch
[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 #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 ACPI_PROCESSOR_COMPONENT        0x01000000
63 #define ACPI_PROCESSOR_CLASS            "processor"
64 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
65 #define ACPI_PROCESSOR_FILE_INFO        "info"
66 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
67 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
69 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
70 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
71
72 #define ACPI_PROCESSOR_LIMIT_USER       0
73 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
74
75 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
76 ACPI_MODULE_NAME("processor_core");
77
78 MODULE_AUTHOR("Paul Diefenbaugh");
79 MODULE_DESCRIPTION("ACPI Processor Driver");
80 MODULE_LICENSE("GPL");
81
82 static int acpi_processor_add(struct acpi_device *device);
83 static int acpi_processor_start(struct acpi_device *device);
84 static int acpi_processor_remove(struct acpi_device *device, int type);
85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
86 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
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 extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
90
91
92 static const struct acpi_device_id processor_device_ids[] = {
93         {ACPI_PROCESSOR_HID, 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                 .start = acpi_processor_start,
106                 .suspend = acpi_processor_suspend,
107                 .resume = acpi_processor_resume,
108                 },
109 };
110
111 #define INSTALL_NOTIFY_HANDLER          1
112 #define UNINSTALL_NOTIFY_HANDLER        2
113
114 static const struct file_operations acpi_processor_info_fops = {
115         .open = acpi_processor_info_open_fs,
116         .read = seq_read,
117         .llseek = seq_lseek,
118         .release = single_release,
119 };
120
121 struct acpi_processor *processors[NR_CPUS];
122 struct acpi_processor_errata errata __read_mostly;
123
124 /* --------------------------------------------------------------------------
125                                 Errata Handling
126    -------------------------------------------------------------------------- */
127
128 static int acpi_processor_errata_piix4(struct pci_dev *dev)
129 {
130         u8 value1 = 0;
131         u8 value2 = 0;
132
133
134         if (!dev)
135                 return -EINVAL;
136
137         /*
138          * Note that 'dev' references the PIIX4 ACPI Controller.
139          */
140
141         switch (dev->revision) {
142         case 0:
143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
144                 break;
145         case 1:
146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
147                 break;
148         case 2:
149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
150                 break;
151         case 3:
152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
153                 break;
154         default:
155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
156                 break;
157         }
158
159         switch (dev->revision) {
160
161         case 0:         /* PIIX4 A-step */
162         case 1:         /* PIIX4 B-step */
163                 /*
164                  * See specification changes #13 ("Manual Throttle Duty Cycle")
165                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
166                  * erratum #5 ("STPCLK# Deassertion Time") from the January
167                  * 2002 PIIX4 specification update.  Applies to only older
168                  * PIIX4 models.
169                  */
170                 errata.piix4.throttle = 1;
171
172         case 2:         /* PIIX4E */
173         case 3:         /* PIIX4M */
174                 /*
175                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
176                  * Livelock") from the January 2002 PIIX4 specification update.
177                  * Applies to all PIIX4 models.
178                  */
179
180                 /*
181                  * BM-IDE
182                  * ------
183                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
184                  * Status register address.  We'll use this later to read
185                  * each IDE controller's DMA status to make sure we catch all
186                  * DMA activity.
187                  */
188                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
189                                      PCI_DEVICE_ID_INTEL_82371AB,
190                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
191                 if (dev) {
192                         errata.piix4.bmisx = pci_resource_start(dev, 4);
193                         pci_dev_put(dev);
194                 }
195
196                 /*
197                  * Type-F DMA
198                  * ----------
199                  * Find the PIIX4 ISA Controller and read the Motherboard
200                  * DMA controller's status to see if Type-F (Fast) DMA mode
201                  * is enabled (bit 7) on either channel.  Note that we'll
202                  * disable C3 support if this is enabled, as some legacy
203                  * devices won't operate well if fast DMA is disabled.
204                  */
205                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
206                                      PCI_DEVICE_ID_INTEL_82371AB_0,
207                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
208                 if (dev) {
209                         pci_read_config_byte(dev, 0x76, &value1);
210                         pci_read_config_byte(dev, 0x77, &value2);
211                         if ((value1 & 0x80) || (value2 & 0x80))
212                                 errata.piix4.fdma = 1;
213                         pci_dev_put(dev);
214                 }
215
216                 break;
217         }
218
219         if (errata.piix4.bmisx)
220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
221                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
222         if (errata.piix4.fdma)
223                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
224                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
225
226         return 0;
227 }
228
229 static int acpi_processor_errata(struct acpi_processor *pr)
230 {
231         int result = 0;
232         struct pci_dev *dev = NULL;
233
234
235         if (!pr)
236                 return -EINVAL;
237
238         /*
239          * PIIX4
240          */
241         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
242                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
243                              PCI_ANY_ID, NULL);
244         if (dev) {
245                 result = acpi_processor_errata_piix4(dev);
246                 pci_dev_put(dev);
247         }
248
249         return result;
250 }
251
252 /* --------------------------------------------------------------------------
253                               Common ACPI processor functions
254    -------------------------------------------------------------------------- */
255
256 /*
257  * _PDC is required for a BIOS-OS handshake for most of the newer
258  * ACPI processor features.
259  */
260 static int acpi_processor_set_pdc(struct acpi_processor *pr)
261 {
262         struct acpi_object_list *pdc_in = pr->pdc;
263         acpi_status status = AE_OK;
264
265
266         if (!pdc_in)
267                 return status;
268
269         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
270
271         if (ACPI_FAILURE(status))
272                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
273                     "Could not evaluate _PDC, using legacy perf. control...\n"));
274
275         return status;
276 }
277
278 /* --------------------------------------------------------------------------
279                               FS Interface (/proc)
280    -------------------------------------------------------------------------- */
281
282 static struct proc_dir_entry *acpi_processor_dir = NULL;
283
284 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
285 {
286         struct acpi_processor *pr = seq->private;
287
288
289         if (!pr)
290                 goto end;
291
292         seq_printf(seq, "processor id:            %d\n"
293                    "acpi id:                 %d\n"
294                    "bus mastering control:   %s\n"
295                    "power management:        %s\n"
296                    "throttling control:      %s\n"
297                    "limit interface:         %s\n",
298                    pr->id,
299                    pr->acpi_id,
300                    pr->flags.bm_control ? "yes" : "no",
301                    pr->flags.power ? "yes" : "no",
302                    pr->flags.throttling ? "yes" : "no",
303                    pr->flags.limit ? "yes" : "no");
304
305       end:
306         return 0;
307 }
308
309 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
310 {
311         return single_open(file, acpi_processor_info_seq_show,
312                            PDE(inode)->data);
313 }
314
315 static int acpi_processor_add_fs(struct acpi_device *device)
316 {
317         struct proc_dir_entry *entry = NULL;
318
319
320         if (!acpi_device_dir(device)) {
321                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
322                                                      acpi_processor_dir);
323                 if (!acpi_device_dir(device))
324                         return -ENODEV;
325         }
326         acpi_device_dir(device)->owner = THIS_MODULE;
327
328         /* 'info' [R] */
329         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
330                                   S_IRUGO, acpi_device_dir(device));
331         if (!entry)
332                 return -EIO;
333         else {
334                 entry->proc_fops = &acpi_processor_info_fops;
335                 entry->data = acpi_driver_data(device);
336                 entry->owner = THIS_MODULE;
337         }
338
339         /* 'throttling' [R/W] */
340         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
341                                   S_IFREG | S_IRUGO | S_IWUSR,
342                                   acpi_device_dir(device));
343         if (!entry)
344                 return -EIO;
345         else {
346                 entry->proc_fops = &acpi_processor_throttling_fops;
347                 entry->data = acpi_driver_data(device);
348                 entry->owner = THIS_MODULE;
349         }
350
351         /* 'limit' [R/W] */
352         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
353                                   S_IFREG | S_IRUGO | S_IWUSR,
354                                   acpi_device_dir(device));
355         if (!entry)
356                 return -EIO;
357         else {
358                 entry->proc_fops = &acpi_processor_limit_fops;
359                 entry->data = acpi_driver_data(device);
360                 entry->owner = THIS_MODULE;
361         }
362
363         return 0;
364 }
365
366 static int acpi_processor_remove_fs(struct acpi_device *device)
367 {
368
369         if (acpi_device_dir(device)) {
370                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
371                                   acpi_device_dir(device));
372                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
373                                   acpi_device_dir(device));
374                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
375                                   acpi_device_dir(device));
376                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
377                 acpi_device_dir(device) = NULL;
378         }
379
380         return 0;
381 }
382
383 /* Use the acpiid in MADT to map cpus in case of SMP */
384
385 #ifndef CONFIG_SMP
386 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
387 #else
388
389 static struct acpi_table_madt *madt;
390
391 static int map_lapic_id(struct acpi_subtable_header *entry,
392                  u32 acpi_id, int *apic_id)
393 {
394         struct acpi_madt_local_apic *lapic =
395                 (struct acpi_madt_local_apic *)entry;
396         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
397             lapic->processor_id == acpi_id) {
398                 *apic_id = lapic->id;
399                 return 1;
400         }
401         return 0;
402 }
403
404 static int map_lsapic_id(struct acpi_subtable_header *entry,
405                   u32 acpi_id, int *apic_id)
406 {
407         struct acpi_madt_local_sapic *lsapic =
408                 (struct acpi_madt_local_sapic *)entry;
409         /* Only check enabled APICs*/
410         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
411                 /* First check against id */
412                 if (lsapic->processor_id == acpi_id) {
413                         *apic_id = (lsapic->id << 8) | lsapic->eid;
414                         return 1;
415                 /* Check against optional uid */
416                 } else if (entry->length >= 16 &&
417                         lsapic->uid == acpi_id) {
418                         *apic_id = lsapic->uid;
419                         return 1;
420                 }
421         }
422         return 0;
423 }
424
425 #ifdef CONFIG_IA64
426 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
427 #else
428 #define arch_cpu_to_apicid      x86_cpu_to_apicid
429 #endif
430
431 static int map_madt_entry(u32 acpi_id)
432 {
433         unsigned long madt_end, entry;
434         int apic_id = -1;
435
436         if (!madt)
437                 return apic_id;
438
439         entry = (unsigned long)madt;
440         madt_end = entry + madt->header.length;
441
442         /* Parse all entries looking for a match. */
443
444         entry += sizeof(struct acpi_table_madt);
445         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
446                 struct acpi_subtable_header *header =
447                         (struct acpi_subtable_header *)entry;
448                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
449                         if (map_lapic_id(header, acpi_id, &apic_id))
450                                 break;
451                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
452                         if (map_lsapic_id(header, acpi_id, &apic_id))
453                                 break;
454                 }
455                 entry += header->length;
456         }
457         return apic_id;
458 }
459
460 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
461 {
462         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
463         union acpi_object *obj;
464         struct acpi_subtable_header *header;
465         int apic_id = -1;
466
467         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
468                 goto exit;
469
470         if (!buffer.length || !buffer.pointer)
471                 goto exit;
472
473         obj = buffer.pointer;
474         if (obj->type != ACPI_TYPE_BUFFER ||
475             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
476                 goto exit;
477         }
478
479         header = (struct acpi_subtable_header *)obj->buffer.pointer;
480         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
481                 map_lapic_id(header, acpi_id, &apic_id);
482         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
483                 map_lsapic_id(header, acpi_id, &apic_id);
484         }
485
486 exit:
487         if (buffer.pointer)
488                 kfree(buffer.pointer);
489         return apic_id;
490 }
491
492 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
493 {
494         int i;
495         int apic_id = -1;
496
497         apic_id = map_mat_entry(handle, acpi_id);
498         if (apic_id == -1)
499                 apic_id = map_madt_entry(acpi_id);
500         if (apic_id == -1)
501                 return apic_id;
502
503         for (i = 0; i < NR_CPUS; ++i) {
504                 if (arch_cpu_to_apicid[i] == apic_id)
505                         return i;
506         }
507         return -1;
508 }
509 #endif
510
511 /* --------------------------------------------------------------------------
512                                  Driver Interface
513    -------------------------------------------------------------------------- */
514
515 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
516 {
517         acpi_status status = 0;
518         union acpi_object object = { 0 };
519         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
520         int cpu_index;
521         static int cpu0_initialized;
522
523
524         if (!pr)
525                 return -EINVAL;
526
527         if (num_online_cpus() > 1)
528                 errata.smp = TRUE;
529
530         acpi_processor_errata(pr);
531
532         /*
533          * Check to see if we have bus mastering arbitration control.  This
534          * is required for proper C3 usage (to maintain cache coherency).
535          */
536         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
537                 pr->flags.bm_control = 1;
538                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
539                                   "Bus mastering arbitration control present\n"));
540         } else
541                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
542                                   "No bus mastering arbitration control\n"));
543
544         /* Check if it is a Device with HID and UID */
545         if (has_uid) {
546                 unsigned long value;
547                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
548                                                 NULL, &value);
549                 if (ACPI_FAILURE(status)) {
550                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
551                         return -ENODEV;
552                 }
553                 pr->acpi_id = value;
554         } else {
555                 /*
556                 * Evalute the processor object.  Note that it is common on SMP to
557                 * have the first (boot) processor with a valid PBLK address while
558                 * all others have a NULL address.
559                 */
560                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
561                 if (ACPI_FAILURE(status)) {
562                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
563                         return -ENODEV;
564                 }
565
566                 /*
567                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
568                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
569                 */
570                 pr->acpi_id = object.processor.proc_id;
571         }
572         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
573
574         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
575         if (!cpu0_initialized && (cpu_index == -1) &&
576             (num_online_cpus() == 1)) {
577                 cpu_index = 0;
578         }
579
580         cpu0_initialized = 1;
581
582         pr->id = cpu_index;
583
584         /*
585          *  Extra Processor objects may be enumerated on MP systems with
586          *  less than the max # of CPUs. They should be ignored _iff
587          *  they are physically not present.
588          */
589         if (pr->id == -1) {
590                 if (ACPI_FAILURE
591                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
592                         return -ENODEV;
593                 }
594         }
595
596         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
597                           pr->acpi_id));
598
599         if (!object.processor.pblk_address)
600                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
601         else if (object.processor.pblk_length != 6)
602                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
603                             object.processor.pblk_length);
604         else {
605                 pr->throttling.address = object.processor.pblk_address;
606                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
607                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
608
609                 pr->pblk = object.processor.pblk_address;
610
611                 /*
612                  * We don't care about error returns - we just try to mark
613                  * these reserved so that nobody else is confused into thinking
614                  * that this region might be unused..
615                  *
616                  * (In particular, allocating the IO range for Cardbus)
617                  */
618                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
619         }
620
621 #ifdef CONFIG_CPU_FREQ
622         acpi_processor_ppc_has_changed(pr);
623 #endif
624         acpi_processor_get_throttling_info(pr);
625         acpi_processor_get_limit_info(pr);
626
627         return 0;
628 }
629
630 static void *processor_device_array[NR_CPUS];
631
632 static int __cpuinit acpi_processor_start(struct acpi_device *device)
633 {
634         int result = 0;
635         acpi_status status = AE_OK;
636         struct acpi_processor *pr;
637
638
639         pr = acpi_driver_data(device);
640
641         result = acpi_processor_get_info(pr, device->flags.unique_id);
642         if (result) {
643                 /* Processor is physically not present */
644                 return 0;
645         }
646
647         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
648
649         /*
650          * Buggy BIOS check
651          * ACPI id of processors can be reported wrongly by the BIOS.
652          * Don't trust it blindly
653          */
654         if (processor_device_array[pr->id] != NULL &&
655             processor_device_array[pr->id] != device) {
656                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
657                         "for the processor\n");
658                 return -ENODEV;
659         }
660         processor_device_array[pr->id] = device;
661
662         processors[pr->id] = pr;
663
664         result = acpi_processor_add_fs(device);
665         if (result)
666                 goto end;
667
668         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
669                                              acpi_processor_notify, pr);
670
671         /* _PDC call should be done before doing anything else (if reqd.). */
672         arch_acpi_processor_init_pdc(pr);
673         acpi_processor_set_pdc(pr);
674
675         acpi_processor_power_init(pr, device);
676
677         if (pr->flags.throttling) {
678                 printk(KERN_INFO PREFIX "%s [%s] (supports",
679                        acpi_device_name(device), acpi_device_bid(device));
680                 printk(" %d throttling states", pr->throttling.state_count);
681                 printk(")\n");
682         }
683
684       end:
685
686         return result;
687 }
688
689 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
690 {
691         struct acpi_processor *pr = data;
692         struct acpi_device *device = NULL;
693
694
695         if (!pr)
696                 return;
697
698         if (acpi_bus_get_device(pr->handle, &device))
699                 return;
700
701         switch (event) {
702         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
703                 acpi_processor_ppc_has_changed(pr);
704                 acpi_bus_generate_proc_event(device, event,
705                                         pr->performance_platform_limit);
706                 acpi_bus_generate_netlink_event(device->pnp.device_class,
707                                                   device->dev.bus_id, event,
708                                                   pr->performance_platform_limit);
709                 break;
710         case ACPI_PROCESSOR_NOTIFY_POWER:
711                 acpi_processor_cst_has_changed(pr);
712                 acpi_bus_generate_proc_event(device, event, 0);
713                 acpi_bus_generate_netlink_event(device->pnp.device_class,
714                                                   device->dev.bus_id, event, 0);
715                 break;
716         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
717                 acpi_processor_tstate_has_changed(pr);
718                 acpi_bus_generate_proc_event(device, event, 0);
719                 acpi_bus_generate_netlink_event(device->pnp.device_class,
720                                                   device->dev.bus_id, event, 0);
721         default:
722                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
723                                   "Unsupported event [0x%x]\n", event));
724                 break;
725         }
726
727         return;
728 }
729
730 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
731                 unsigned long action, void *hcpu)
732 {
733         unsigned int cpu = (unsigned long)hcpu;
734         struct acpi_processor *pr = processors[cpu];
735
736         if (action == CPU_ONLINE && pr) {
737                 acpi_processor_ppc_has_changed(pr);
738                 acpi_processor_cst_has_changed(pr);
739                 acpi_processor_tstate_has_changed(pr);
740         }
741         return NOTIFY_OK;
742 }
743
744 static struct notifier_block acpi_cpu_notifier =
745 {
746             .notifier_call = acpi_cpu_soft_notify,
747 };
748
749 static int acpi_processor_add(struct acpi_device *device)
750 {
751         struct acpi_processor *pr = NULL;
752
753
754         if (!device)
755                 return -EINVAL;
756
757         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
758         if (!pr)
759                 return -ENOMEM;
760
761         pr->handle = device->handle;
762         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
763         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
764         acpi_driver_data(device) = pr;
765
766         return 0;
767 }
768
769 static int acpi_processor_remove(struct acpi_device *device, int type)
770 {
771         acpi_status status = AE_OK;
772         struct acpi_processor *pr = NULL;
773
774
775         if (!device || !acpi_driver_data(device))
776                 return -EINVAL;
777
778         pr = acpi_driver_data(device);
779
780         if (pr->id >= NR_CPUS) {
781                 kfree(pr);
782                 return 0;
783         }
784
785         if (type == ACPI_BUS_REMOVAL_EJECT) {
786                 if (acpi_processor_handle_eject(pr))
787                         return -EINVAL;
788         }
789
790         acpi_processor_power_exit(pr, device);
791
792         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
793                                             acpi_processor_notify);
794
795         acpi_processor_remove_fs(device);
796
797         processors[pr->id] = NULL;
798
799         kfree(pr);
800
801         return 0;
802 }
803
804 #ifdef CONFIG_ACPI_HOTPLUG_CPU
805 /****************************************************************************
806  *      Acpi processor hotplug support                                      *
807  ****************************************************************************/
808
809 static int is_processor_present(acpi_handle handle);
810
811 static int is_processor_present(acpi_handle handle)
812 {
813         acpi_status status;
814         unsigned long sta = 0;
815
816
817         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
818         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
819                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
820                 return 0;
821         }
822         return 1;
823 }
824
825 static
826 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
827 {
828         acpi_handle phandle;
829         struct acpi_device *pdev;
830         struct acpi_processor *pr;
831
832
833         if (acpi_get_parent(handle, &phandle)) {
834                 return -ENODEV;
835         }
836
837         if (acpi_bus_get_device(phandle, &pdev)) {
838                 return -ENODEV;
839         }
840
841         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
842                 return -ENODEV;
843         }
844
845         acpi_bus_start(*device);
846
847         pr = acpi_driver_data(*device);
848         if (!pr)
849                 return -ENODEV;
850
851         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
852                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
853         }
854         return 0;
855 }
856
857 static void
858 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
859 {
860         struct acpi_processor *pr;
861         struct acpi_device *device = NULL;
862         int result;
863
864
865         switch (event) {
866         case ACPI_NOTIFY_BUS_CHECK:
867         case ACPI_NOTIFY_DEVICE_CHECK:
868                 printk("Processor driver received %s event\n",
869                        (event == ACPI_NOTIFY_BUS_CHECK) ?
870                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
871
872                 if (!is_processor_present(handle))
873                         break;
874
875                 if (acpi_bus_get_device(handle, &device)) {
876                         result = acpi_processor_device_add(handle, &device);
877                         if (result)
878                                 printk(KERN_ERR PREFIX
879                                             "Unable to add the device\n");
880                         break;
881                 }
882
883                 pr = acpi_driver_data(device);
884                 if (!pr) {
885                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
886                         break;
887                 }
888
889                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
890                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
891                         break;
892                 }
893
894                 result = acpi_processor_start(device);
895                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
896                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
897                 } else {
898                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
899                                     acpi_device_bid(device));
900                 }
901                 break;
902         case ACPI_NOTIFY_EJECT_REQUEST:
903                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
904                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
905
906                 if (acpi_bus_get_device(handle, &device)) {
907                         printk(KERN_ERR PREFIX
908                                     "Device don't exist, dropping EJECT\n");
909                         break;
910                 }
911                 pr = acpi_driver_data(device);
912                 if (!pr) {
913                         printk(KERN_ERR PREFIX
914                                     "Driver data is NULL, dropping EJECT\n");
915                         return;
916                 }
917
918                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
919                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
920                 break;
921         default:
922                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
923                                   "Unsupported event [0x%x]\n", event));
924                 break;
925         }
926
927         return;
928 }
929
930 static acpi_status
931 processor_walk_namespace_cb(acpi_handle handle,
932                             u32 lvl, void *context, void **rv)
933 {
934         acpi_status status;
935         int *action = context;
936         acpi_object_type type = 0;
937
938         status = acpi_get_type(handle, &type);
939         if (ACPI_FAILURE(status))
940                 return (AE_OK);
941
942         if (type != ACPI_TYPE_PROCESSOR)
943                 return (AE_OK);
944
945         switch (*action) {
946         case INSTALL_NOTIFY_HANDLER:
947                 acpi_install_notify_handler(handle,
948                                             ACPI_SYSTEM_NOTIFY,
949                                             acpi_processor_hotplug_notify,
950                                             NULL);
951                 break;
952         case UNINSTALL_NOTIFY_HANDLER:
953                 acpi_remove_notify_handler(handle,
954                                            ACPI_SYSTEM_NOTIFY,
955                                            acpi_processor_hotplug_notify);
956                 break;
957         default:
958                 break;
959         }
960
961         return (AE_OK);
962 }
963
964 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
965 {
966
967         if (!is_processor_present(handle)) {
968                 return AE_ERROR;
969         }
970
971         if (acpi_map_lsapic(handle, p_cpu))
972                 return AE_ERROR;
973
974         if (arch_register_cpu(*p_cpu)) {
975                 acpi_unmap_lsapic(*p_cpu);
976                 return AE_ERROR;
977         }
978
979         return AE_OK;
980 }
981
982 static int acpi_processor_handle_eject(struct acpi_processor *pr)
983 {
984         if (cpu_online(pr->id)) {
985                 return (-EINVAL);
986         }
987         arch_unregister_cpu(pr->id);
988         acpi_unmap_lsapic(pr->id);
989         return (0);
990 }
991 #else
992 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
993 {
994         return AE_ERROR;
995 }
996 static int acpi_processor_handle_eject(struct acpi_processor *pr)
997 {
998         return (-EINVAL);
999 }
1000 #endif
1001
1002 static
1003 void acpi_processor_install_hotplug_notify(void)
1004 {
1005 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1006         int action = INSTALL_NOTIFY_HANDLER;
1007         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1008                             ACPI_ROOT_OBJECT,
1009                             ACPI_UINT32_MAX,
1010                             processor_walk_namespace_cb, &action, NULL);
1011 #endif
1012         register_hotcpu_notifier(&acpi_cpu_notifier);
1013 }
1014
1015 static
1016 void acpi_processor_uninstall_hotplug_notify(void)
1017 {
1018 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1019         int action = UNINSTALL_NOTIFY_HANDLER;
1020         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1021                             ACPI_ROOT_OBJECT,
1022                             ACPI_UINT32_MAX,
1023                             processor_walk_namespace_cb, &action, NULL);
1024 #endif
1025         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1026 }
1027
1028 /*
1029  * We keep the driver loaded even when ACPI is not running.
1030  * This is needed for the powernow-k8 driver, that works even without
1031  * ACPI, but needs symbols from this driver
1032  */
1033
1034 static int __init acpi_processor_init(void)
1035 {
1036         int result = 0;
1037
1038
1039         memset(&processors, 0, sizeof(processors));
1040         memset(&errata, 0, sizeof(errata));
1041
1042 #ifdef CONFIG_SMP
1043         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1044                                 (struct acpi_table_header **)&madt)))
1045                 madt = NULL;
1046 #endif
1047
1048         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1049         if (!acpi_processor_dir)
1050                 return -ENOMEM;
1051         acpi_processor_dir->owner = THIS_MODULE;
1052
1053         result = cpuidle_register_driver(&acpi_idle_driver);
1054         if (result < 0)
1055                 goto out_proc;
1056
1057         result = acpi_bus_register_driver(&acpi_processor_driver);
1058         if (result < 0)
1059                 goto out_cpuidle;
1060
1061         acpi_processor_install_hotplug_notify();
1062
1063         acpi_thermal_cpufreq_init();
1064
1065         acpi_processor_ppc_init();
1066
1067         return 0;
1068
1069 out_cpuidle:
1070         cpuidle_unregister_driver(&acpi_idle_driver);
1071
1072 out_proc:
1073         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1074
1075         return result;
1076 }
1077
1078 static void __exit acpi_processor_exit(void)
1079 {
1080         acpi_processor_ppc_exit();
1081
1082         acpi_thermal_cpufreq_exit();
1083
1084         acpi_processor_uninstall_hotplug_notify();
1085
1086         acpi_bus_unregister_driver(&acpi_processor_driver);
1087
1088         cpuidle_unregister_driver(&acpi_idle_driver);
1089
1090         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1091
1092         return;
1093 }
1094
1095 module_init(acpi_processor_init);
1096 module_exit(acpi_processor_exit);
1097
1098 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1099
1100 MODULE_ALIAS("processor");