2afb3d2086b3d03b3e4858caffba20f6f456c90f
[sfrench/cifs-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_DEVICE_NAME      "Processor"
64 #define ACPI_PROCESSOR_FILE_INFO        "info"
65 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
66 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
68 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
69 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
70
71 #define ACPI_PROCESSOR_LIMIT_USER       0
72 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
73
74 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
75 ACPI_MODULE_NAME("processor_core");
76
77 MODULE_AUTHOR("Paul Diefenbaugh");
78 MODULE_DESCRIPTION("ACPI Processor Driver");
79 MODULE_LICENSE("GPL");
80
81 static int acpi_processor_add(struct acpi_device *device);
82 static int acpi_processor_start(struct acpi_device *device);
83 static int acpi_processor_remove(struct acpi_device *device, int type);
84 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
85 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
86 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
87 static int acpi_processor_handle_eject(struct acpi_processor *pr);
88 extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
89
90
91 static const struct acpi_device_id processor_device_ids[] = {
92         {ACPI_PROCESSOR_HID, 0},
93         {"", 0},
94 };
95 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
96
97 static struct acpi_driver acpi_processor_driver = {
98         .name = "processor",
99         .class = ACPI_PROCESSOR_CLASS,
100         .ids = processor_device_ids,
101         .ops = {
102                 .add = acpi_processor_add,
103                 .remove = acpi_processor_remove,
104                 .start = acpi_processor_start,
105                 },
106 };
107
108 #define INSTALL_NOTIFY_HANDLER          1
109 #define UNINSTALL_NOTIFY_HANDLER        2
110
111 static const struct file_operations acpi_processor_info_fops = {
112         .open = acpi_processor_info_open_fs,
113         .read = seq_read,
114         .llseek = seq_lseek,
115         .release = single_release,
116 };
117
118 struct acpi_processor *processors[NR_CPUS];
119 struct acpi_processor_errata errata __read_mostly;
120
121 /* --------------------------------------------------------------------------
122                                 Errata Handling
123    -------------------------------------------------------------------------- */
124
125 static int acpi_processor_errata_piix4(struct pci_dev *dev)
126 {
127         u8 value1 = 0;
128         u8 value2 = 0;
129
130
131         if (!dev)
132                 return -EINVAL;
133
134         /*
135          * Note that 'dev' references the PIIX4 ACPI Controller.
136          */
137
138         switch (dev->revision) {
139         case 0:
140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
141                 break;
142         case 1:
143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
144                 break;
145         case 2:
146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
147                 break;
148         case 3:
149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
150                 break;
151         default:
152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
153                 break;
154         }
155
156         switch (dev->revision) {
157
158         case 0:         /* PIIX4 A-step */
159         case 1:         /* PIIX4 B-step */
160                 /*
161                  * See specification changes #13 ("Manual Throttle Duty Cycle")
162                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
163                  * erratum #5 ("STPCLK# Deassertion Time") from the January
164                  * 2002 PIIX4 specification update.  Applies to only older
165                  * PIIX4 models.
166                  */
167                 errata.piix4.throttle = 1;
168
169         case 2:         /* PIIX4E */
170         case 3:         /* PIIX4M */
171                 /*
172                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
173                  * Livelock") from the January 2002 PIIX4 specification update.
174                  * Applies to all PIIX4 models.
175                  */
176
177                 /*
178                  * BM-IDE
179                  * ------
180                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
181                  * Status register address.  We'll use this later to read
182                  * each IDE controller's DMA status to make sure we catch all
183                  * DMA activity.
184                  */
185                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
186                                      PCI_DEVICE_ID_INTEL_82371AB,
187                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
188                 if (dev) {
189                         errata.piix4.bmisx = pci_resource_start(dev, 4);
190                         pci_dev_put(dev);
191                 }
192
193                 /*
194                  * Type-F DMA
195                  * ----------
196                  * Find the PIIX4 ISA Controller and read the Motherboard
197                  * DMA controller's status to see if Type-F (Fast) DMA mode
198                  * is enabled (bit 7) on either channel.  Note that we'll
199                  * disable C3 support if this is enabled, as some legacy
200                  * devices won't operate well if fast DMA is disabled.
201                  */
202                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
203                                      PCI_DEVICE_ID_INTEL_82371AB_0,
204                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
205                 if (dev) {
206                         pci_read_config_byte(dev, 0x76, &value1);
207                         pci_read_config_byte(dev, 0x77, &value2);
208                         if ((value1 & 0x80) || (value2 & 0x80))
209                                 errata.piix4.fdma = 1;
210                         pci_dev_put(dev);
211                 }
212
213                 break;
214         }
215
216         if (errata.piix4.bmisx)
217                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
218                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
219         if (errata.piix4.fdma)
220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
221                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
222
223         return 0;
224 }
225
226 static int acpi_processor_errata(struct acpi_processor *pr)
227 {
228         int result = 0;
229         struct pci_dev *dev = NULL;
230
231
232         if (!pr)
233                 return -EINVAL;
234
235         /*
236          * PIIX4
237          */
238         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
239                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
240                              PCI_ANY_ID, NULL);
241         if (dev) {
242                 result = acpi_processor_errata_piix4(dev);
243                 pci_dev_put(dev);
244         }
245
246         return result;
247 }
248
249 /* --------------------------------------------------------------------------
250                               Common ACPI processor functions
251    -------------------------------------------------------------------------- */
252
253 /*
254  * _PDC is required for a BIOS-OS handshake for most of the newer
255  * ACPI processor features.
256  */
257 static int acpi_processor_set_pdc(struct acpi_processor *pr)
258 {
259         struct acpi_object_list *pdc_in = pr->pdc;
260         acpi_status status = AE_OK;
261
262
263         if (!pdc_in)
264                 return status;
265
266         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
267
268         if (ACPI_FAILURE(status))
269                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
270                     "Could not evaluate _PDC, using legacy perf. control...\n"));
271
272         return status;
273 }
274
275 /* --------------------------------------------------------------------------
276                               FS Interface (/proc)
277    -------------------------------------------------------------------------- */
278
279 static struct proc_dir_entry *acpi_processor_dir = NULL;
280
281 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
282 {
283         struct acpi_processor *pr = seq->private;
284
285
286         if (!pr)
287                 goto end;
288
289         seq_printf(seq, "processor id:            %d\n"
290                    "acpi id:                 %d\n"
291                    "bus mastering control:   %s\n"
292                    "power management:        %s\n"
293                    "throttling control:      %s\n"
294                    "limit interface:         %s\n",
295                    pr->id,
296                    pr->acpi_id,
297                    pr->flags.bm_control ? "yes" : "no",
298                    pr->flags.power ? "yes" : "no",
299                    pr->flags.throttling ? "yes" : "no",
300                    pr->flags.limit ? "yes" : "no");
301
302       end:
303         return 0;
304 }
305
306 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
307 {
308         return single_open(file, acpi_processor_info_seq_show,
309                            PDE(inode)->data);
310 }
311
312 static int acpi_processor_add_fs(struct acpi_device *device)
313 {
314         struct proc_dir_entry *entry = NULL;
315
316
317         if (!acpi_device_dir(device)) {
318                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
319                                                      acpi_processor_dir);
320                 if (!acpi_device_dir(device))
321                         return -ENODEV;
322         }
323         acpi_device_dir(device)->owner = THIS_MODULE;
324
325         /* 'info' [R] */
326         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
327                                   S_IRUGO, acpi_device_dir(device));
328         if (!entry)
329                 return -EIO;
330         else {
331                 entry->proc_fops = &acpi_processor_info_fops;
332                 entry->data = acpi_driver_data(device);
333                 entry->owner = THIS_MODULE;
334         }
335
336         /* 'throttling' [R/W] */
337         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
338                                   S_IFREG | S_IRUGO | S_IWUSR,
339                                   acpi_device_dir(device));
340         if (!entry)
341                 return -EIO;
342         else {
343                 entry->proc_fops = &acpi_processor_throttling_fops;
344                 entry->data = acpi_driver_data(device);
345                 entry->owner = THIS_MODULE;
346         }
347
348         /* 'limit' [R/W] */
349         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
350                                   S_IFREG | S_IRUGO | S_IWUSR,
351                                   acpi_device_dir(device));
352         if (!entry)
353                 return -EIO;
354         else {
355                 entry->proc_fops = &acpi_processor_limit_fops;
356                 entry->data = acpi_driver_data(device);
357                 entry->owner = THIS_MODULE;
358         }
359
360         return 0;
361 }
362
363 static int acpi_processor_remove_fs(struct acpi_device *device)
364 {
365
366         if (acpi_device_dir(device)) {
367                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
368                                   acpi_device_dir(device));
369                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
370                                   acpi_device_dir(device));
371                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
372                                   acpi_device_dir(device));
373                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
374                 acpi_device_dir(device) = NULL;
375         }
376
377         return 0;
378 }
379
380 /* Use the acpiid in MADT to map cpus in case of SMP */
381
382 #ifndef CONFIG_SMP
383 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
384 #else
385
386 static struct acpi_table_madt *madt;
387
388 static int map_lapic_id(struct acpi_subtable_header *entry,
389                  u32 acpi_id, int *apic_id)
390 {
391         struct acpi_madt_local_apic *lapic =
392                 (struct acpi_madt_local_apic *)entry;
393         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
394             lapic->processor_id == acpi_id) {
395                 *apic_id = lapic->id;
396                 return 1;
397         }
398         return 0;
399 }
400
401 static int map_lsapic_id(struct acpi_subtable_header *entry,
402                   u32 acpi_id, int *apic_id)
403 {
404         struct acpi_madt_local_sapic *lsapic =
405                 (struct acpi_madt_local_sapic *)entry;
406         /* Only check enabled APICs*/
407         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
408                 /* First check against id */
409                 if (lsapic->processor_id == acpi_id) {
410                         *apic_id = (lsapic->id << 8) | lsapic->eid;
411                         return 1;
412                 /* Check against optional uid */
413                 } else if (entry->length >= 16 &&
414                         lsapic->uid == acpi_id) {
415                         *apic_id = lsapic->uid;
416                         return 1;
417                 }
418         }
419         return 0;
420 }
421
422 #ifdef CONFIG_IA64
423 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
424 #else
425 #define arch_cpu_to_apicid      x86_cpu_to_apicid
426 #endif
427
428 static int map_madt_entry(u32 acpi_id)
429 {
430         unsigned long madt_end, entry;
431         int apic_id = -1;
432
433         if (!madt)
434                 return apic_id;
435
436         entry = (unsigned long)madt;
437         madt_end = entry + madt->header.length;
438
439         /* Parse all entries looking for a match. */
440
441         entry += sizeof(struct acpi_table_madt);
442         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
443                 struct acpi_subtable_header *header =
444                         (struct acpi_subtable_header *)entry;
445                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
446                         if (map_lapic_id(header, acpi_id, &apic_id))
447                                 break;
448                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
449                         if (map_lsapic_id(header, acpi_id, &apic_id))
450                                 break;
451                 }
452                 entry += header->length;
453         }
454         return apic_id;
455 }
456
457 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
458 {
459         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
460         union acpi_object *obj;
461         struct acpi_subtable_header *header;
462         int apic_id = -1;
463
464         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
465                 goto exit;
466
467         if (!buffer.length || !buffer.pointer)
468                 goto exit;
469
470         obj = buffer.pointer;
471         if (obj->type != ACPI_TYPE_BUFFER ||
472             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
473                 goto exit;
474         }
475
476         header = (struct acpi_subtable_header *)obj->buffer.pointer;
477         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
478                 map_lapic_id(header, acpi_id, &apic_id);
479         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
480                 map_lsapic_id(header, acpi_id, &apic_id);
481         }
482
483 exit:
484         if (buffer.pointer)
485                 kfree(buffer.pointer);
486         return apic_id;
487 }
488
489 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
490 {
491         int i;
492         int apic_id = -1;
493
494         apic_id = map_mat_entry(handle, acpi_id);
495         if (apic_id == -1)
496                 apic_id = map_madt_entry(acpi_id);
497         if (apic_id == -1)
498                 return apic_id;
499
500         for (i = 0; i < NR_CPUS; ++i) {
501                 if (arch_cpu_to_apicid[i] == apic_id)
502                         return i;
503         }
504         return -1;
505 }
506 #endif
507
508 /* --------------------------------------------------------------------------
509                                  Driver Interface
510    -------------------------------------------------------------------------- */
511
512 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
513 {
514         acpi_status status = 0;
515         union acpi_object object = { 0 };
516         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
517         int cpu_index;
518         static int cpu0_initialized;
519
520
521         if (!pr)
522                 return -EINVAL;
523
524         if (num_online_cpus() > 1)
525                 errata.smp = TRUE;
526
527         acpi_processor_errata(pr);
528
529         /*
530          * Check to see if we have bus mastering arbitration control.  This
531          * is required for proper C3 usage (to maintain cache coherency).
532          */
533         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
534                 pr->flags.bm_control = 1;
535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
536                                   "Bus mastering arbitration control present\n"));
537         } else
538                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
539                                   "No bus mastering arbitration control\n"));
540
541         /* Check if it is a Device with HID and UID */
542         if (has_uid) {
543                 unsigned long value;
544                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
545                                                 NULL, &value);
546                 if (ACPI_FAILURE(status)) {
547                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
548                         return -ENODEV;
549                 }
550                 pr->acpi_id = value;
551         } else {
552                 /*
553                 * Evalute the processor object.  Note that it is common on SMP to
554                 * have the first (boot) processor with a valid PBLK address while
555                 * all others have a NULL address.
556                 */
557                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
558                 if (ACPI_FAILURE(status)) {
559                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
560                         return -ENODEV;
561                 }
562
563                 /*
564                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
565                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
566                 */
567                 pr->acpi_id = object.processor.proc_id;
568         }
569         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
570
571         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
572         if (!cpu0_initialized && (cpu_index == -1) &&
573             (num_online_cpus() == 1)) {
574                 cpu_index = 0;
575         }
576
577         cpu0_initialized = 1;
578
579         pr->id = cpu_index;
580
581         /*
582          *  Extra Processor objects may be enumerated on MP systems with
583          *  less than the max # of CPUs. They should be ignored _iff
584          *  they are physically not present.
585          */
586         if (pr->id == -1) {
587                 if (ACPI_FAILURE
588                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
589                         return -ENODEV;
590                 }
591         }
592
593         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
594                           pr->acpi_id));
595
596         if (!object.processor.pblk_address)
597                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
598         else if (object.processor.pblk_length != 6)
599                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
600                             object.processor.pblk_length);
601         else {
602                 pr->throttling.address = object.processor.pblk_address;
603                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
604                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
605
606                 pr->pblk = object.processor.pblk_address;
607
608                 /*
609                  * We don't care about error returns - we just try to mark
610                  * these reserved so that nobody else is confused into thinking
611                  * that this region might be unused..
612                  *
613                  * (In particular, allocating the IO range for Cardbus)
614                  */
615                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
616         }
617
618 #ifdef CONFIG_CPU_FREQ
619         acpi_processor_ppc_has_changed(pr);
620 #endif
621         acpi_processor_get_throttling_info(pr);
622         acpi_processor_get_limit_info(pr);
623
624         return 0;
625 }
626
627 static void *processor_device_array[NR_CPUS];
628
629 static int __cpuinit acpi_processor_start(struct acpi_device *device)
630 {
631         int result = 0;
632         acpi_status status = AE_OK;
633         struct acpi_processor *pr;
634
635
636         pr = acpi_driver_data(device);
637
638         result = acpi_processor_get_info(pr, device->flags.unique_id);
639         if (result) {
640                 /* Processor is physically not present */
641                 return 0;
642         }
643
644         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
645
646         /*
647          * Buggy BIOS check
648          * ACPI id of processors can be reported wrongly by the BIOS.
649          * Don't trust it blindly
650          */
651         if (processor_device_array[pr->id] != NULL &&
652             processor_device_array[pr->id] != device) {
653                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
654                         "for the processor\n");
655                 return -ENODEV;
656         }
657         processor_device_array[pr->id] = device;
658
659         processors[pr->id] = pr;
660
661         result = acpi_processor_add_fs(device);
662         if (result)
663                 goto end;
664
665         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
666                                              acpi_processor_notify, pr);
667
668         /* _PDC call should be done before doing anything else (if reqd.). */
669         arch_acpi_processor_init_pdc(pr);
670         acpi_processor_set_pdc(pr);
671
672         acpi_processor_power_init(pr, device);
673
674         if (pr->flags.throttling) {
675                 printk(KERN_INFO PREFIX "%s [%s] (supports",
676                        acpi_device_name(device), acpi_device_bid(device));
677                 printk(" %d throttling states", pr->throttling.state_count);
678                 printk(")\n");
679         }
680
681       end:
682
683         return result;
684 }
685
686 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
687 {
688         struct acpi_processor *pr = data;
689         struct acpi_device *device = NULL;
690
691
692         if (!pr)
693                 return;
694
695         if (acpi_bus_get_device(pr->handle, &device))
696                 return;
697
698         switch (event) {
699         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
700                 acpi_processor_ppc_has_changed(pr);
701                 acpi_bus_generate_proc_event(device, event,
702                                         pr->performance_platform_limit);
703                 acpi_bus_generate_netlink_event(device->pnp.device_class,
704                                                   device->dev.bus_id, event,
705                                                   pr->performance_platform_limit);
706                 break;
707         case ACPI_PROCESSOR_NOTIFY_POWER:
708                 acpi_processor_cst_has_changed(pr);
709                 acpi_bus_generate_proc_event(device, event, 0);
710                 acpi_bus_generate_netlink_event(device->pnp.device_class,
711                                                   device->dev.bus_id, event, 0);
712                 break;
713         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
714                 acpi_processor_tstate_has_changed(pr);
715                 acpi_bus_generate_proc_event(device, event, 0);
716                 acpi_bus_generate_netlink_event(device->pnp.device_class,
717                                                   device->dev.bus_id, event, 0);
718         default:
719                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
720                                   "Unsupported event [0x%x]\n", event));
721                 break;
722         }
723
724         return;
725 }
726
727 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
728                 unsigned long action, void *hcpu)
729 {
730         unsigned int cpu = (unsigned long)hcpu;
731         struct acpi_processor *pr = processors[cpu];
732
733         if (action == CPU_ONLINE && pr) {
734                 acpi_processor_ppc_has_changed(pr);
735                 acpi_processor_cst_has_changed(pr);
736                 acpi_processor_tstate_has_changed(pr);
737         }
738         return NOTIFY_OK;
739 }
740
741 static struct notifier_block acpi_cpu_notifier =
742 {
743             .notifier_call = acpi_cpu_soft_notify,
744 };
745
746 static int acpi_processor_add(struct acpi_device *device)
747 {
748         struct acpi_processor *pr = NULL;
749
750
751         if (!device)
752                 return -EINVAL;
753
754         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
755         if (!pr)
756                 return -ENOMEM;
757
758         pr->handle = device->handle;
759         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
760         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
761         acpi_driver_data(device) = pr;
762
763         return 0;
764 }
765
766 static int acpi_processor_remove(struct acpi_device *device, int type)
767 {
768         acpi_status status = AE_OK;
769         struct acpi_processor *pr = NULL;
770
771
772         if (!device || !acpi_driver_data(device))
773                 return -EINVAL;
774
775         pr = acpi_driver_data(device);
776
777         if (pr->id >= NR_CPUS) {
778                 kfree(pr);
779                 return 0;
780         }
781
782         if (type == ACPI_BUS_REMOVAL_EJECT) {
783                 if (acpi_processor_handle_eject(pr))
784                         return -EINVAL;
785         }
786
787         acpi_processor_power_exit(pr, device);
788
789         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
790                                             acpi_processor_notify);
791
792         acpi_processor_remove_fs(device);
793
794         processors[pr->id] = NULL;
795
796         kfree(pr);
797
798         return 0;
799 }
800
801 #ifdef CONFIG_ACPI_HOTPLUG_CPU
802 /****************************************************************************
803  *      Acpi processor hotplug support                                      *
804  ****************************************************************************/
805
806 static int is_processor_present(acpi_handle handle);
807
808 static int is_processor_present(acpi_handle handle)
809 {
810         acpi_status status;
811         unsigned long sta = 0;
812
813
814         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
815         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
816                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
817                 return 0;
818         }
819         return 1;
820 }
821
822 static
823 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
824 {
825         acpi_handle phandle;
826         struct acpi_device *pdev;
827         struct acpi_processor *pr;
828
829
830         if (acpi_get_parent(handle, &phandle)) {
831                 return -ENODEV;
832         }
833
834         if (acpi_bus_get_device(phandle, &pdev)) {
835                 return -ENODEV;
836         }
837
838         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
839                 return -ENODEV;
840         }
841
842         acpi_bus_start(*device);
843
844         pr = acpi_driver_data(*device);
845         if (!pr)
846                 return -ENODEV;
847
848         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
849                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
850         }
851         return 0;
852 }
853
854 static void
855 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
856 {
857         struct acpi_processor *pr;
858         struct acpi_device *device = NULL;
859         int result;
860
861
862         switch (event) {
863         case ACPI_NOTIFY_BUS_CHECK:
864         case ACPI_NOTIFY_DEVICE_CHECK:
865                 printk("Processor driver received %s event\n",
866                        (event == ACPI_NOTIFY_BUS_CHECK) ?
867                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
868
869                 if (!is_processor_present(handle))
870                         break;
871
872                 if (acpi_bus_get_device(handle, &device)) {
873                         result = acpi_processor_device_add(handle, &device);
874                         if (result)
875                                 printk(KERN_ERR PREFIX
876                                             "Unable to add the device\n");
877                         break;
878                 }
879
880                 pr = acpi_driver_data(device);
881                 if (!pr) {
882                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
883                         break;
884                 }
885
886                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
887                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
888                         break;
889                 }
890
891                 result = acpi_processor_start(device);
892                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
893                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
894                 } else {
895                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
896                                     acpi_device_bid(device));
897                 }
898                 break;
899         case ACPI_NOTIFY_EJECT_REQUEST:
900                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
901                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
902
903                 if (acpi_bus_get_device(handle, &device)) {
904                         printk(KERN_ERR PREFIX
905                                     "Device don't exist, dropping EJECT\n");
906                         break;
907                 }
908                 pr = acpi_driver_data(device);
909                 if (!pr) {
910                         printk(KERN_ERR PREFIX
911                                     "Driver data is NULL, dropping EJECT\n");
912                         return;
913                 }
914
915                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
916                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
917                 break;
918         default:
919                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
920                                   "Unsupported event [0x%x]\n", event));
921                 break;
922         }
923
924         return;
925 }
926
927 static acpi_status
928 processor_walk_namespace_cb(acpi_handle handle,
929                             u32 lvl, void *context, void **rv)
930 {
931         acpi_status status;
932         int *action = context;
933         acpi_object_type type = 0;
934
935         status = acpi_get_type(handle, &type);
936         if (ACPI_FAILURE(status))
937                 return (AE_OK);
938
939         if (type != ACPI_TYPE_PROCESSOR)
940                 return (AE_OK);
941
942         switch (*action) {
943         case INSTALL_NOTIFY_HANDLER:
944                 acpi_install_notify_handler(handle,
945                                             ACPI_SYSTEM_NOTIFY,
946                                             acpi_processor_hotplug_notify,
947                                             NULL);
948                 break;
949         case UNINSTALL_NOTIFY_HANDLER:
950                 acpi_remove_notify_handler(handle,
951                                            ACPI_SYSTEM_NOTIFY,
952                                            acpi_processor_hotplug_notify);
953                 break;
954         default:
955                 break;
956         }
957
958         return (AE_OK);
959 }
960
961 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
962 {
963
964         if (!is_processor_present(handle)) {
965                 return AE_ERROR;
966         }
967
968         if (acpi_map_lsapic(handle, p_cpu))
969                 return AE_ERROR;
970
971         if (arch_register_cpu(*p_cpu)) {
972                 acpi_unmap_lsapic(*p_cpu);
973                 return AE_ERROR;
974         }
975
976         return AE_OK;
977 }
978
979 static int acpi_processor_handle_eject(struct acpi_processor *pr)
980 {
981         if (cpu_online(pr->id)) {
982                 return (-EINVAL);
983         }
984         arch_unregister_cpu(pr->id);
985         acpi_unmap_lsapic(pr->id);
986         return (0);
987 }
988 #else
989 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
990 {
991         return AE_ERROR;
992 }
993 static int acpi_processor_handle_eject(struct acpi_processor *pr)
994 {
995         return (-EINVAL);
996 }
997 #endif
998
999 static
1000 void acpi_processor_install_hotplug_notify(void)
1001 {
1002 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1003         int action = INSTALL_NOTIFY_HANDLER;
1004         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1005                             ACPI_ROOT_OBJECT,
1006                             ACPI_UINT32_MAX,
1007                             processor_walk_namespace_cb, &action, NULL);
1008 #endif
1009         register_hotcpu_notifier(&acpi_cpu_notifier);
1010 }
1011
1012 static
1013 void acpi_processor_uninstall_hotplug_notify(void)
1014 {
1015 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1016         int action = UNINSTALL_NOTIFY_HANDLER;
1017         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1018                             ACPI_ROOT_OBJECT,
1019                             ACPI_UINT32_MAX,
1020                             processor_walk_namespace_cb, &action, NULL);
1021 #endif
1022         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1023 }
1024
1025 /*
1026  * We keep the driver loaded even when ACPI is not running.
1027  * This is needed for the powernow-k8 driver, that works even without
1028  * ACPI, but needs symbols from this driver
1029  */
1030
1031 static int __init acpi_processor_init(void)
1032 {
1033         int result = 0;
1034
1035
1036         memset(&processors, 0, sizeof(processors));
1037         memset(&errata, 0, sizeof(errata));
1038
1039 #ifdef CONFIG_SMP
1040         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1041                                 (struct acpi_table_header **)&madt)))
1042                 madt = NULL;
1043 #endif
1044
1045         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1046         if (!acpi_processor_dir)
1047                 return -ENOMEM;
1048         acpi_processor_dir->owner = THIS_MODULE;
1049
1050         result = acpi_bus_register_driver(&acpi_processor_driver);
1051         if (result < 0) {
1052                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1053                 return result;
1054         }
1055
1056         acpi_processor_install_hotplug_notify();
1057
1058         acpi_thermal_cpufreq_init();
1059
1060         acpi_processor_ppc_init();
1061
1062         return 0;
1063 }
1064
1065 static void __exit acpi_processor_exit(void)
1066 {
1067
1068         acpi_processor_ppc_exit();
1069
1070         acpi_thermal_cpufreq_exit();
1071
1072         acpi_processor_uninstall_hotplug_notify();
1073
1074         acpi_bus_unregister_driver(&acpi_processor_driver);
1075
1076         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1077
1078         return;
1079 }
1080
1081 module_init(acpi_processor_init);
1082 module_exit(acpi_processor_exit);
1083
1084 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1085
1086 MODULE_ALIAS("processor");