0079bc51082c723eb35ee5098159f1acf3574ba2
[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
379 #ifndef CONFIG_SMP
380 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
381 #else
382
383 static struct acpi_table_madt *madt;
384
385 static int map_lapic_id(struct acpi_subtable_header *entry,
386                  u32 acpi_id, int *apic_id)
387 {
388         struct acpi_madt_local_apic *lapic =
389                 (struct acpi_madt_local_apic *)entry;
390         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
391             lapic->processor_id == acpi_id) {
392                 *apic_id = lapic->id;
393                 return 1;
394         }
395         return 0;
396 }
397
398 static int map_lsapic_id(struct acpi_subtable_header *entry,
399                   u32 acpi_id, int *apic_id)
400 {
401         struct acpi_madt_local_sapic *lsapic =
402                 (struct acpi_madt_local_sapic *)entry;
403         /* Only check enabled APICs*/
404         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
405                 /* First check against id */
406                 if (lsapic->processor_id == acpi_id) {
407                         *apic_id = lsapic->id;
408                         return 1;
409                 /* Check against optional uid */
410                 } else if (entry->length >= 16 &&
411                         lsapic->uid == acpi_id) {
412                         *apic_id = lsapic->uid;
413                         return 1;
414                 }
415         }
416         return 0;
417 }
418
419 #ifdef CONFIG_IA64
420 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
421 #else
422 #define arch_cpu_to_apicid      x86_cpu_to_apicid
423 #endif
424
425 static int map_madt_entry(u32 acpi_id)
426 {
427         unsigned long madt_end, entry;
428         int apic_id = -1;
429
430         if (!madt)
431                 return apic_id;
432
433         entry = (unsigned long)madt;
434         madt_end = entry + madt->header.length;
435
436         /* Parse all entries looking for a match. */
437
438         entry += sizeof(struct acpi_table_madt);
439         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
440                 struct acpi_subtable_header *header =
441                         (struct acpi_subtable_header *)entry;
442                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
443                         if (map_lapic_id(header, acpi_id, &apic_id))
444                                 break;
445                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
446                         if (map_lsapic_id(header, acpi_id, &apic_id))
447                                 break;
448                 }
449                 entry += header->length;
450         }
451         return apic_id;
452 }
453
454 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
455 {
456         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
457         union acpi_object *obj;
458         struct acpi_subtable_header *header;
459         int apic_id = -1;
460
461         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
462                 goto exit;
463
464         if (!buffer.length || !buffer.pointer)
465                 goto exit;
466
467         obj = buffer.pointer;
468         if (obj->type != ACPI_TYPE_BUFFER ||
469             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
470                 goto exit;
471         }
472
473         header = (struct acpi_subtable_header *)obj->buffer.pointer;
474         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
475                 map_lapic_id(header, acpi_id, &apic_id);
476         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
477                 map_lsapic_id(header, acpi_id, &apic_id);
478         }
479
480 exit:
481         if (buffer.pointer)
482                 kfree(buffer.pointer);
483         return apic_id;
484 }
485
486 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
487 {
488         int i;
489         int apic_id = -1;
490
491         apic_id = map_mat_entry(handle, acpi_id);
492         if (apic_id == -1)
493                 apic_id = map_madt_entry(acpi_id);
494         if (apic_id == -1)
495                 return apic_id;
496
497         for (i = 0; i < NR_CPUS; ++i) {
498                 if (arch_cpu_to_apicid[i] == apic_id)
499                         return i;
500         }
501         return -1;
502 }
503 #endif
504
505 /* --------------------------------------------------------------------------
506                                  Driver Interface
507    -------------------------------------------------------------------------- */
508
509 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
510 {
511         acpi_status status = 0;
512         union acpi_object object = { 0 };
513         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
514         int cpu_index;
515         static int cpu0_initialized;
516
517
518         if (!pr)
519                 return -EINVAL;
520
521         if (num_online_cpus() > 1)
522                 errata.smp = TRUE;
523
524         acpi_processor_errata(pr);
525
526         /*
527          * Check to see if we have bus mastering arbitration control.  This
528          * is required for proper C3 usage (to maintain cache coherency).
529          */
530         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
531                 pr->flags.bm_control = 1;
532                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
533                                   "Bus mastering arbitration control present\n"));
534         } else
535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
536                                   "No bus mastering arbitration control\n"));
537
538         /* Check if it is a Device with HID and UID */
539         if (has_uid) {
540                 unsigned long value;
541                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
542                                                 NULL, &value);
543                 if (ACPI_FAILURE(status)) {
544                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
545                         return -ENODEV;
546                 }
547                 pr->acpi_id = value;
548         } else {
549                 /*
550                 * Evalute the processor object.  Note that it is common on SMP to
551                 * have the first (boot) processor with a valid PBLK address while
552                 * all others have a NULL address.
553                 */
554                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
555                 if (ACPI_FAILURE(status)) {
556                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
557                         return -ENODEV;
558                 }
559
560                 /*
561                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
562                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
563                 */
564                 pr->acpi_id = object.processor.proc_id;
565         }
566         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
567
568         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
569         if (!cpu0_initialized && (cpu_index == -1) &&
570             (num_online_cpus() == 1)) {
571                 cpu_index = 0;
572         }
573
574         cpu0_initialized = 1;
575
576         pr->id = cpu_index;
577
578         /*
579          *  Extra Processor objects may be enumerated on MP systems with
580          *  less than the max # of CPUs. They should be ignored _iff
581          *  they are physically not present.
582          */
583         if (pr->id == -1) {
584                 if (ACPI_FAILURE
585                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
586                         return -ENODEV;
587                 }
588         }
589
590         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
591                           pr->acpi_id));
592
593         if (!object.processor.pblk_address)
594                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
595         else if (object.processor.pblk_length != 6)
596                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
597                             object.processor.pblk_length);
598         else {
599                 pr->throttling.address = object.processor.pblk_address;
600                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
601                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
602
603                 pr->pblk = object.processor.pblk_address;
604
605                 /*
606                  * We don't care about error returns - we just try to mark
607                  * these reserved so that nobody else is confused into thinking
608                  * that this region might be unused..
609                  *
610                  * (In particular, allocating the IO range for Cardbus)
611                  */
612                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
613         }
614
615 #ifdef CONFIG_CPU_FREQ
616         acpi_processor_ppc_has_changed(pr);
617 #endif
618         acpi_processor_get_throttling_info(pr);
619         acpi_processor_get_limit_info(pr);
620
621         return 0;
622 }
623
624 static void *processor_device_array[NR_CPUS];
625
626 static int __cpuinit acpi_processor_start(struct acpi_device *device)
627 {
628         int result = 0;
629         acpi_status status = AE_OK;
630         struct acpi_processor *pr;
631
632
633         pr = acpi_driver_data(device);
634
635         result = acpi_processor_get_info(pr, device->flags.unique_id);
636         if (result) {
637                 /* Processor is physically not present */
638                 return 0;
639         }
640
641         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
642
643         /*
644          * Buggy BIOS check
645          * ACPI id of processors can be reported wrongly by the BIOS.
646          * Don't trust it blindly
647          */
648         if (processor_device_array[pr->id] != NULL &&
649             processor_device_array[pr->id] != device) {
650                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
651                         "for the processor\n");
652                 return -ENODEV;
653         }
654         processor_device_array[pr->id] = device;
655
656         processors[pr->id] = pr;
657
658         result = acpi_processor_add_fs(device);
659         if (result)
660                 goto end;
661
662         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
663                                              acpi_processor_notify, pr);
664
665         /* _PDC call should be done before doing anything else (if reqd.). */
666         arch_acpi_processor_init_pdc(pr);
667         acpi_processor_set_pdc(pr);
668
669         acpi_processor_power_init(pr, device);
670
671         if (pr->flags.throttling) {
672                 printk(KERN_INFO PREFIX "%s [%s] (supports",
673                        acpi_device_name(device), acpi_device_bid(device));
674                 printk(" %d throttling states", pr->throttling.state_count);
675                 printk(")\n");
676         }
677
678       end:
679
680         return result;
681 }
682
683 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
684 {
685         struct acpi_processor *pr = data;
686         struct acpi_device *device = NULL;
687
688
689         if (!pr)
690                 return;
691
692         if (acpi_bus_get_device(pr->handle, &device))
693                 return;
694
695         switch (event) {
696         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
697                 acpi_processor_ppc_has_changed(pr);
698                 acpi_bus_generate_event(device, event,
699                                         pr->performance_platform_limit);
700                 break;
701         case ACPI_PROCESSOR_NOTIFY_POWER:
702                 acpi_processor_cst_has_changed(pr);
703                 acpi_bus_generate_event(device, event, 0);
704                 break;
705         default:
706                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
707                                   "Unsupported event [0x%x]\n", event));
708                 break;
709         }
710
711         return;
712 }
713
714 static int acpi_processor_add(struct acpi_device *device)
715 {
716         struct acpi_processor *pr = NULL;
717
718
719         if (!device)
720                 return -EINVAL;
721
722         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
723         if (!pr)
724                 return -ENOMEM;
725
726         pr->handle = device->handle;
727         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
728         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
729         acpi_driver_data(device) = pr;
730
731         return 0;
732 }
733
734 static int acpi_processor_remove(struct acpi_device *device, int type)
735 {
736         acpi_status status = AE_OK;
737         struct acpi_processor *pr = NULL;
738
739
740         if (!device || !acpi_driver_data(device))
741                 return -EINVAL;
742
743         pr = acpi_driver_data(device);
744
745         if (pr->id >= NR_CPUS) {
746                 kfree(pr);
747                 return 0;
748         }
749
750         if (type == ACPI_BUS_REMOVAL_EJECT) {
751                 if (acpi_processor_handle_eject(pr))
752                         return -EINVAL;
753         }
754
755         acpi_processor_power_exit(pr, device);
756
757         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
758                                             acpi_processor_notify);
759
760         acpi_processor_remove_fs(device);
761
762         processors[pr->id] = NULL;
763
764         kfree(pr);
765
766         return 0;
767 }
768
769 #ifdef CONFIG_ACPI_HOTPLUG_CPU
770 /****************************************************************************
771  *      Acpi processor hotplug support                                      *
772  ****************************************************************************/
773
774 static int is_processor_present(acpi_handle handle);
775
776 static int is_processor_present(acpi_handle handle)
777 {
778         acpi_status status;
779         unsigned long sta = 0;
780
781
782         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
783         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
784                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
785                 return 0;
786         }
787         return 1;
788 }
789
790 static
791 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
792 {
793         acpi_handle phandle;
794         struct acpi_device *pdev;
795         struct acpi_processor *pr;
796
797
798         if (acpi_get_parent(handle, &phandle)) {
799                 return -ENODEV;
800         }
801
802         if (acpi_bus_get_device(phandle, &pdev)) {
803                 return -ENODEV;
804         }
805
806         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
807                 return -ENODEV;
808         }
809
810         acpi_bus_start(*device);
811
812         pr = acpi_driver_data(*device);
813         if (!pr)
814                 return -ENODEV;
815
816         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
817                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
818         }
819         return 0;
820 }
821
822 static void
823 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
824 {
825         struct acpi_processor *pr;
826         struct acpi_device *device = NULL;
827         int result;
828
829
830         switch (event) {
831         case ACPI_NOTIFY_BUS_CHECK:
832         case ACPI_NOTIFY_DEVICE_CHECK:
833                 printk("Processor driver received %s event\n",
834                        (event == ACPI_NOTIFY_BUS_CHECK) ?
835                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
836
837                 if (!is_processor_present(handle))
838                         break;
839
840                 if (acpi_bus_get_device(handle, &device)) {
841                         result = acpi_processor_device_add(handle, &device);
842                         if (result)
843                                 printk(KERN_ERR PREFIX
844                                             "Unable to add the device\n");
845                         break;
846                 }
847
848                 pr = acpi_driver_data(device);
849                 if (!pr) {
850                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
851                         break;
852                 }
853
854                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
855                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
856                         break;
857                 }
858
859                 result = acpi_processor_start(device);
860                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
861                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
862                 } else {
863                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
864                                     acpi_device_bid(device));
865                 }
866                 break;
867         case ACPI_NOTIFY_EJECT_REQUEST:
868                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
869                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
870
871                 if (acpi_bus_get_device(handle, &device)) {
872                         printk(KERN_ERR PREFIX
873                                     "Device don't exist, dropping EJECT\n");
874                         break;
875                 }
876                 pr = acpi_driver_data(device);
877                 if (!pr) {
878                         printk(KERN_ERR PREFIX
879                                     "Driver data is NULL, dropping EJECT\n");
880                         return;
881                 }
882
883                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
884                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
885                 break;
886         default:
887                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
888                                   "Unsupported event [0x%x]\n", event));
889                 break;
890         }
891
892         return;
893 }
894
895 static acpi_status
896 processor_walk_namespace_cb(acpi_handle handle,
897                             u32 lvl, void *context, void **rv)
898 {
899         acpi_status status;
900         int *action = context;
901         acpi_object_type type = 0;
902
903         status = acpi_get_type(handle, &type);
904         if (ACPI_FAILURE(status))
905                 return (AE_OK);
906
907         if (type != ACPI_TYPE_PROCESSOR)
908                 return (AE_OK);
909
910         switch (*action) {
911         case INSTALL_NOTIFY_HANDLER:
912                 acpi_install_notify_handler(handle,
913                                             ACPI_SYSTEM_NOTIFY,
914                                             acpi_processor_hotplug_notify,
915                                             NULL);
916                 break;
917         case UNINSTALL_NOTIFY_HANDLER:
918                 acpi_remove_notify_handler(handle,
919                                            ACPI_SYSTEM_NOTIFY,
920                                            acpi_processor_hotplug_notify);
921                 break;
922         default:
923                 break;
924         }
925
926         return (AE_OK);
927 }
928
929 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
930 {
931
932         if (!is_processor_present(handle)) {
933                 return AE_ERROR;
934         }
935
936         if (acpi_map_lsapic(handle, p_cpu))
937                 return AE_ERROR;
938
939         if (arch_register_cpu(*p_cpu)) {
940                 acpi_unmap_lsapic(*p_cpu);
941                 return AE_ERROR;
942         }
943
944         return AE_OK;
945 }
946
947 static int acpi_processor_handle_eject(struct acpi_processor *pr)
948 {
949         if (cpu_online(pr->id)) {
950                 return (-EINVAL);
951         }
952         arch_unregister_cpu(pr->id);
953         acpi_unmap_lsapic(pr->id);
954         return (0);
955 }
956 #else
957 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
958 {
959         return AE_ERROR;
960 }
961 static int acpi_processor_handle_eject(struct acpi_processor *pr)
962 {
963         return (-EINVAL);
964 }
965 #endif
966
967 static
968 void acpi_processor_install_hotplug_notify(void)
969 {
970 #ifdef CONFIG_ACPI_HOTPLUG_CPU
971         int action = INSTALL_NOTIFY_HANDLER;
972         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
973                             ACPI_ROOT_OBJECT,
974                             ACPI_UINT32_MAX,
975                             processor_walk_namespace_cb, &action, NULL);
976 #endif
977 }
978
979 static
980 void acpi_processor_uninstall_hotplug_notify(void)
981 {
982 #ifdef CONFIG_ACPI_HOTPLUG_CPU
983         int action = UNINSTALL_NOTIFY_HANDLER;
984         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
985                             ACPI_ROOT_OBJECT,
986                             ACPI_UINT32_MAX,
987                             processor_walk_namespace_cb, &action, NULL);
988 #endif
989 }
990
991 /*
992  * We keep the driver loaded even when ACPI is not running.
993  * This is needed for the powernow-k8 driver, that works even without
994  * ACPI, but needs symbols from this driver
995  */
996
997 static int __init acpi_processor_init(void)
998 {
999         int result = 0;
1000
1001
1002         memset(&processors, 0, sizeof(processors));
1003         memset(&errata, 0, sizeof(errata));
1004
1005 #ifdef CONFIG_SMP
1006         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1007                                 (struct acpi_table_header **)&madt)))
1008                 madt = 0;
1009 #endif
1010
1011         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1012         if (!acpi_processor_dir)
1013                 return -ENOMEM;
1014         acpi_processor_dir->owner = THIS_MODULE;
1015
1016         result = acpi_bus_register_driver(&acpi_processor_driver);
1017         if (result < 0) {
1018                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1019                 return result;
1020         }
1021
1022         acpi_processor_install_hotplug_notify();
1023
1024         acpi_thermal_cpufreq_init();
1025
1026         acpi_processor_ppc_init();
1027
1028         return 0;
1029 }
1030
1031 static void __exit acpi_processor_exit(void)
1032 {
1033
1034         acpi_processor_ppc_exit();
1035
1036         acpi_thermal_cpufreq_exit();
1037
1038         acpi_processor_uninstall_hotplug_notify();
1039
1040         acpi_bus_unregister_driver(&acpi_processor_driver);
1041
1042         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1043
1044         return;
1045 }
1046
1047 module_init(acpi_processor_init);
1048 module_exit(acpi_processor_exit);
1049
1050 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1051
1052 MODULE_ALIAS("processor");