ACPI: Remove repeated registered as cooling_device messages
[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 PREFIX "ACPI: "
63
64 #define ACPI_PROCESSOR_CLASS            "processor"
65 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
66 #define ACPI_PROCESSOR_FILE_INFO        "info"
67 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
68 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
69 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
70 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
71 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
72
73 #define ACPI_PROCESSOR_LIMIT_USER       0
74 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
75
76 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
77 ACPI_MODULE_NAME("processor_core");
78
79 MODULE_AUTHOR("Paul Diefenbaugh");
80 MODULE_DESCRIPTION("ACPI Processor Driver");
81 MODULE_LICENSE("GPL");
82
83 static int acpi_processor_add(struct acpi_device *device);
84 static int acpi_processor_remove(struct acpi_device *device, int type);
85 #ifdef CONFIG_ACPI_PROCFS
86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
87 #endif
88 static void acpi_processor_notify(struct acpi_device *device, u32 event);
89 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
90 static int acpi_processor_handle_eject(struct acpi_processor *pr);
91
92
93 static const struct acpi_device_id processor_device_ids[] = {
94         {ACPI_PROCESSOR_OBJECT_HID, 0},
95         {"ACPI0007", 0},
96         {"", 0},
97 };
98 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
99
100 static struct acpi_driver acpi_processor_driver = {
101         .name = "processor",
102         .class = ACPI_PROCESSOR_CLASS,
103         .ids = processor_device_ids,
104         .ops = {
105                 .add = acpi_processor_add,
106                 .remove = acpi_processor_remove,
107                 .suspend = acpi_processor_suspend,
108                 .resume = acpi_processor_resume,
109                 .notify = acpi_processor_notify,
110                 },
111 };
112
113 #define INSTALL_NOTIFY_HANDLER          1
114 #define UNINSTALL_NOTIFY_HANDLER        2
115 #ifdef CONFIG_ACPI_PROCFS
116 static const struct file_operations acpi_processor_info_fops = {
117         .owner = THIS_MODULE,
118         .open = acpi_processor_info_open_fs,
119         .read = seq_read,
120         .llseek = seq_lseek,
121         .release = single_release,
122 };
123 #endif
124
125 DEFINE_PER_CPU(struct acpi_processor *, processors);
126 struct acpi_processor_errata errata __read_mostly;
127 static int set_no_mwait(const struct dmi_system_id *id)
128 {
129         printk(KERN_NOTICE PREFIX "%s detected - "
130                 "disabling mwait for CPU C-states\n", id->ident);
131         idle_nomwait = 1;
132         return 0;
133 }
134
135 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
136         {
137         set_no_mwait, "IFL91 board", {
138         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
139         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
140         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
141         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
142         {
143         set_no_mwait, "Extensa 5220", {
144         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
145         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
146         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
147         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
148         {},
149 };
150
151 /* --------------------------------------------------------------------------
152                                 Errata Handling
153    -------------------------------------------------------------------------- */
154
155 static int acpi_processor_errata_piix4(struct pci_dev *dev)
156 {
157         u8 value1 = 0;
158         u8 value2 = 0;
159
160
161         if (!dev)
162                 return -EINVAL;
163
164         /*
165          * Note that 'dev' references the PIIX4 ACPI Controller.
166          */
167
168         switch (dev->revision) {
169         case 0:
170                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
171                 break;
172         case 1:
173                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
174                 break;
175         case 2:
176                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
177                 break;
178         case 3:
179                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
180                 break;
181         default:
182                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
183                 break;
184         }
185
186         switch (dev->revision) {
187
188         case 0:         /* PIIX4 A-step */
189         case 1:         /* PIIX4 B-step */
190                 /*
191                  * See specification changes #13 ("Manual Throttle Duty Cycle")
192                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
193                  * erratum #5 ("STPCLK# Deassertion Time") from the January
194                  * 2002 PIIX4 specification update.  Applies to only older
195                  * PIIX4 models.
196                  */
197                 errata.piix4.throttle = 1;
198
199         case 2:         /* PIIX4E */
200         case 3:         /* PIIX4M */
201                 /*
202                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
203                  * Livelock") from the January 2002 PIIX4 specification update.
204                  * Applies to all PIIX4 models.
205                  */
206
207                 /*
208                  * BM-IDE
209                  * ------
210                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
211                  * Status register address.  We'll use this later to read
212                  * each IDE controller's DMA status to make sure we catch all
213                  * DMA activity.
214                  */
215                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
216                                      PCI_DEVICE_ID_INTEL_82371AB,
217                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
218                 if (dev) {
219                         errata.piix4.bmisx = pci_resource_start(dev, 4);
220                         pci_dev_put(dev);
221                 }
222
223                 /*
224                  * Type-F DMA
225                  * ----------
226                  * Find the PIIX4 ISA Controller and read the Motherboard
227                  * DMA controller's status to see if Type-F (Fast) DMA mode
228                  * is enabled (bit 7) on either channel.  Note that we'll
229                  * disable C3 support if this is enabled, as some legacy
230                  * devices won't operate well if fast DMA is disabled.
231                  */
232                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
233                                      PCI_DEVICE_ID_INTEL_82371AB_0,
234                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
235                 if (dev) {
236                         pci_read_config_byte(dev, 0x76, &value1);
237                         pci_read_config_byte(dev, 0x77, &value2);
238                         if ((value1 & 0x80) || (value2 & 0x80))
239                                 errata.piix4.fdma = 1;
240                         pci_dev_put(dev);
241                 }
242
243                 break;
244         }
245
246         if (errata.piix4.bmisx)
247                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
248                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
249         if (errata.piix4.fdma)
250                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
251                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
252
253         return 0;
254 }
255
256 static int acpi_processor_errata(struct acpi_processor *pr)
257 {
258         int result = 0;
259         struct pci_dev *dev = NULL;
260
261
262         if (!pr)
263                 return -EINVAL;
264
265         /*
266          * PIIX4
267          */
268         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
269                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
270                              PCI_ANY_ID, NULL);
271         if (dev) {
272                 result = acpi_processor_errata_piix4(dev);
273                 pci_dev_put(dev);
274         }
275
276         return result;
277 }
278
279 /* --------------------------------------------------------------------------
280                               Common ACPI processor functions
281    -------------------------------------------------------------------------- */
282
283 /*
284  * _PDC is required for a BIOS-OS handshake for most of the newer
285  * ACPI processor features.
286  */
287 static int acpi_processor_set_pdc(struct acpi_processor *pr)
288 {
289         struct acpi_object_list *pdc_in = pr->pdc;
290         acpi_status status = AE_OK;
291
292
293         if (!pdc_in)
294                 return status;
295         if (idle_nomwait) {
296                 /*
297                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
298                  * mode will be disabled in the parameter of _PDC object.
299                  * Of course C1_FFH access mode will also be disabled.
300                  */
301                 union acpi_object *obj;
302                 u32 *buffer = NULL;
303
304                 obj = pdc_in->pointer;
305                 buffer = (u32 *)(obj->buffer.pointer);
306                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
307
308         }
309         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
310
311         if (ACPI_FAILURE(status))
312                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
313                     "Could not evaluate _PDC, using legacy perf. control...\n"));
314
315         return status;
316 }
317
318 /* --------------------------------------------------------------------------
319                               FS Interface (/proc)
320    -------------------------------------------------------------------------- */
321
322 #ifdef CONFIG_ACPI_PROCFS
323 static struct proc_dir_entry *acpi_processor_dir = NULL;
324
325 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
326 {
327         struct acpi_processor *pr = seq->private;
328
329
330         if (!pr)
331                 goto end;
332
333         seq_printf(seq, "processor id:            %d\n"
334                    "acpi id:                 %d\n"
335                    "bus mastering control:   %s\n"
336                    "power management:        %s\n"
337                    "throttling control:      %s\n"
338                    "limit interface:         %s\n",
339                    pr->id,
340                    pr->acpi_id,
341                    pr->flags.bm_control ? "yes" : "no",
342                    pr->flags.power ? "yes" : "no",
343                    pr->flags.throttling ? "yes" : "no",
344                    pr->flags.limit ? "yes" : "no");
345
346       end:
347         return 0;
348 }
349
350 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
351 {
352         return single_open(file, acpi_processor_info_seq_show,
353                            PDE(inode)->data);
354 }
355
356 static int acpi_processor_add_fs(struct acpi_device *device)
357 {
358         struct proc_dir_entry *entry = NULL;
359
360
361         if (!acpi_device_dir(device)) {
362                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
363                                                      acpi_processor_dir);
364                 if (!acpi_device_dir(device))
365                         return -ENODEV;
366         }
367
368         /* 'info' [R] */
369         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
370                                  S_IRUGO, acpi_device_dir(device),
371                                  &acpi_processor_info_fops,
372                                  acpi_driver_data(device));
373         if (!entry)
374                 return -EIO;
375
376         /* 'throttling' [R/W] */
377         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
378                                  S_IFREG | S_IRUGO | S_IWUSR,
379                                  acpi_device_dir(device),
380                                  &acpi_processor_throttling_fops,
381                                  acpi_driver_data(device));
382         if (!entry)
383                 return -EIO;
384
385         /* 'limit' [R/W] */
386         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
387                                  S_IFREG | S_IRUGO | S_IWUSR,
388                                  acpi_device_dir(device),
389                                  &acpi_processor_limit_fops,
390                                  acpi_driver_data(device));
391         if (!entry)
392                 return -EIO;
393         return 0;
394 }
395 static int acpi_processor_remove_fs(struct acpi_device *device)
396 {
397
398         if (acpi_device_dir(device)) {
399                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
400                                   acpi_device_dir(device));
401                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
402                                   acpi_device_dir(device));
403                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
404                                   acpi_device_dir(device));
405                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
406                 acpi_device_dir(device) = NULL;
407         }
408
409         return 0;
410 }
411 #else
412 static inline int acpi_processor_add_fs(struct acpi_device *device)
413 {
414         return 0;
415 }
416 static inline int acpi_processor_remove_fs(struct acpi_device *device)
417 {
418         return 0;
419 }
420 #endif
421
422 /* Use the acpiid in MADT to map cpus in case of SMP */
423
424 #ifndef CONFIG_SMP
425 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
426 #else
427
428 static struct acpi_table_madt *madt;
429
430 static int map_lapic_id(struct acpi_subtable_header *entry,
431                  u32 acpi_id, int *apic_id)
432 {
433         struct acpi_madt_local_apic *lapic =
434                 (struct acpi_madt_local_apic *)entry;
435         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
436             lapic->processor_id == acpi_id) {
437                 *apic_id = lapic->id;
438                 return 1;
439         }
440         return 0;
441 }
442
443 static int map_x2apic_id(struct acpi_subtable_header *entry,
444                          int device_declaration, u32 acpi_id, int *apic_id)
445 {
446         struct acpi_madt_local_x2apic *apic =
447                 (struct acpi_madt_local_x2apic *)entry;
448         u32 tmp = apic->local_apic_id;
449
450         /* Only check enabled APICs*/
451         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
452                 return 0;
453
454         /* Device statement declaration type */
455         if (device_declaration) {
456                 if (apic->uid == acpi_id)
457                         goto found;
458         }
459
460         return 0;
461 found:
462         *apic_id = tmp;
463         return 1;
464 }
465
466 static int map_lsapic_id(struct acpi_subtable_header *entry,
467                 int device_declaration, u32 acpi_id, int *apic_id)
468 {
469         struct acpi_madt_local_sapic *lsapic =
470                 (struct acpi_madt_local_sapic *)entry;
471         u32 tmp = (lsapic->id << 8) | lsapic->eid;
472
473         /* Only check enabled APICs*/
474         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
475                 return 0;
476
477         /* Device statement declaration type */
478         if (device_declaration) {
479                 if (entry->length < 16)
480                         printk(KERN_ERR PREFIX
481                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
482                             tmp);
483                 else if (lsapic->uid == acpi_id)
484                         goto found;
485         /* Processor statement declaration type */
486         } else if (lsapic->processor_id == acpi_id)
487                 goto found;
488
489         return 0;
490 found:
491         *apic_id = tmp;
492         return 1;
493 }
494
495 static int map_madt_entry(int type, u32 acpi_id)
496 {
497         unsigned long madt_end, entry;
498         int apic_id = -1;
499
500         if (!madt)
501                 return apic_id;
502
503         entry = (unsigned long)madt;
504         madt_end = entry + madt->header.length;
505
506         /* Parse all entries looking for a match. */
507
508         entry += sizeof(struct acpi_table_madt);
509         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
510                 struct acpi_subtable_header *header =
511                         (struct acpi_subtable_header *)entry;
512                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
513                         if (map_lapic_id(header, acpi_id, &apic_id))
514                                 break;
515                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
516                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
517                                 break;
518                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
519                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
520                                 break;
521                 }
522                 entry += header->length;
523         }
524         return apic_id;
525 }
526
527 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
528 {
529         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
530         union acpi_object *obj;
531         struct acpi_subtable_header *header;
532         int apic_id = -1;
533
534         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
535                 goto exit;
536
537         if (!buffer.length || !buffer.pointer)
538                 goto exit;
539
540         obj = buffer.pointer;
541         if (obj->type != ACPI_TYPE_BUFFER ||
542             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
543                 goto exit;
544         }
545
546         header = (struct acpi_subtable_header *)obj->buffer.pointer;
547         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
548                 map_lapic_id(header, acpi_id, &apic_id);
549         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
550                 map_lsapic_id(header, type, acpi_id, &apic_id);
551         }
552
553 exit:
554         if (buffer.pointer)
555                 kfree(buffer.pointer);
556         return apic_id;
557 }
558
559 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
560 {
561         int i;
562         int apic_id = -1;
563
564         apic_id = map_mat_entry(handle, type, acpi_id);
565         if (apic_id == -1)
566                 apic_id = map_madt_entry(type, acpi_id);
567         if (apic_id == -1)
568                 return apic_id;
569
570         for_each_possible_cpu(i) {
571                 if (cpu_physical_id(i) == apic_id)
572                         return i;
573         }
574         return -1;
575 }
576 #endif
577
578 /* --------------------------------------------------------------------------
579                                  Driver Interface
580    -------------------------------------------------------------------------- */
581
582 static int acpi_processor_get_info(struct acpi_device *device)
583 {
584         acpi_status status = 0;
585         union acpi_object object = { 0 };
586         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
587         struct acpi_processor *pr;
588         int cpu_index, device_declaration = 0;
589         static int cpu0_initialized;
590
591         pr = acpi_driver_data(device);
592         if (!pr)
593                 return -EINVAL;
594
595         if (num_online_cpus() > 1)
596                 errata.smp = TRUE;
597
598         acpi_processor_errata(pr);
599
600         /*
601          * Check to see if we have bus mastering arbitration control.  This
602          * is required for proper C3 usage (to maintain cache coherency).
603          */
604         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
605                 pr->flags.bm_control = 1;
606                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
607                                   "Bus mastering arbitration control present\n"));
608         } else
609                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
610                                   "No bus mastering arbitration control\n"));
611
612         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
613                 /* Declared with "Processor" statement; match ProcessorID */
614                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
615                 if (ACPI_FAILURE(status)) {
616                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
617                         return -ENODEV;
618                 }
619
620                 /*
621                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
622                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
623                  *      arch/xxx/acpi.c
624                  */
625                 pr->acpi_id = object.processor.proc_id;
626         } else {
627                 /*
628                  * Declared with "Device" statement; match _UID.
629                  * Note that we don't handle string _UIDs yet.
630                  */
631                 unsigned long long value;
632                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
633                                                 NULL, &value);
634                 if (ACPI_FAILURE(status)) {
635                         printk(KERN_ERR PREFIX
636                             "Evaluating processor _UID [%#x]\n", status);
637                         return -ENODEV;
638                 }
639                 device_declaration = 1;
640                 pr->acpi_id = value;
641         }
642         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
643
644         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
645         if (!cpu0_initialized && (cpu_index == -1) &&
646             (num_online_cpus() == 1)) {
647                 cpu_index = 0;
648         }
649
650         cpu0_initialized = 1;
651
652         pr->id = cpu_index;
653
654         /*
655          *  Extra Processor objects may be enumerated on MP systems with
656          *  less than the max # of CPUs. They should be ignored _iff
657          *  they are physically not present.
658          */
659         if (pr->id == -1) {
660                 if (ACPI_FAILURE
661                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
662                         return -ENODEV;
663                 }
664         }
665         /*
666          * On some boxes several processors use the same processor bus id.
667          * But they are located in different scope. For example:
668          * \_SB.SCK0.CPU0
669          * \_SB.SCK1.CPU0
670          * Rename the processor device bus id. And the new bus id will be
671          * generated as the following format:
672          * CPU+CPU ID.
673          */
674         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
675         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
676                           pr->acpi_id));
677
678         if (!object.processor.pblk_address)
679                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
680         else if (object.processor.pblk_length != 6)
681                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
682                             object.processor.pblk_length);
683         else {
684                 pr->throttling.address = object.processor.pblk_address;
685                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
686                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
687
688                 pr->pblk = object.processor.pblk_address;
689
690                 /*
691                  * We don't care about error returns - we just try to mark
692                  * these reserved so that nobody else is confused into thinking
693                  * that this region might be unused..
694                  *
695                  * (In particular, allocating the IO range for Cardbus)
696                  */
697                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
698         }
699
700         /*
701          * If ACPI describes a slot number for this CPU, we can use it
702          * ensure we get the right value in the "physical id" field
703          * of /proc/cpuinfo
704          */
705         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
706         if (ACPI_SUCCESS(status))
707                 arch_fix_phys_package_id(pr->id, object.integer.value);
708
709         return 0;
710 }
711
712 static DEFINE_PER_CPU(void *, processor_device_array);
713
714 static void acpi_processor_notify(struct acpi_device *device, u32 event)
715 {
716         struct acpi_processor *pr = acpi_driver_data(device);
717         int saved;
718
719         if (!pr)
720                 return;
721
722         switch (event) {
723         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
724                 saved = pr->performance_platform_limit;
725                 acpi_processor_ppc_has_changed(pr);
726                 if (saved == pr->performance_platform_limit)
727                         break;
728                 acpi_bus_generate_proc_event(device, event,
729                                         pr->performance_platform_limit);
730                 acpi_bus_generate_netlink_event(device->pnp.device_class,
731                                                   dev_name(&device->dev), event,
732                                                   pr->performance_platform_limit);
733                 break;
734         case ACPI_PROCESSOR_NOTIFY_POWER:
735                 acpi_processor_cst_has_changed(pr);
736                 acpi_bus_generate_proc_event(device, event, 0);
737                 acpi_bus_generate_netlink_event(device->pnp.device_class,
738                                                   dev_name(&device->dev), event, 0);
739                 break;
740         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
741                 acpi_processor_tstate_has_changed(pr);
742                 acpi_bus_generate_proc_event(device, event, 0);
743                 acpi_bus_generate_netlink_event(device->pnp.device_class,
744                                                   dev_name(&device->dev), event, 0);
745         default:
746                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
747                                   "Unsupported event [0x%x]\n", event));
748                 break;
749         }
750
751         return;
752 }
753
754 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
755                 unsigned long action, void *hcpu)
756 {
757         unsigned int cpu = (unsigned long)hcpu;
758         struct acpi_processor *pr = per_cpu(processors, cpu);
759
760         if (action == CPU_ONLINE && pr) {
761                 acpi_processor_ppc_has_changed(pr);
762                 acpi_processor_cst_has_changed(pr);
763                 acpi_processor_tstate_has_changed(pr);
764         }
765         return NOTIFY_OK;
766 }
767
768 static struct notifier_block acpi_cpu_notifier =
769 {
770             .notifier_call = acpi_cpu_soft_notify,
771 };
772
773 static int __cpuinit acpi_processor_add(struct acpi_device *device)
774 {
775         struct acpi_processor *pr = NULL;
776         int result = 0;
777         struct sys_device *sysdev;
778
779         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
780         if (!pr)
781                 return -ENOMEM;
782
783         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
784                 kfree(pr);
785                 return -ENOMEM;
786         }
787
788         pr->handle = device->handle;
789         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
790         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
791         device->driver_data = pr;
792
793         result = acpi_processor_get_info(device);
794         if (result) {
795                 /* Processor is physically not present */
796                 return 0;
797         }
798
799         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
800
801         /*
802          * Buggy BIOS check
803          * ACPI id of processors can be reported wrongly by the BIOS.
804          * Don't trust it blindly
805          */
806         if (per_cpu(processor_device_array, pr->id) != NULL &&
807             per_cpu(processor_device_array, pr->id) != device) {
808                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
809                         "for the processor\n");
810                 result = -ENODEV;
811                 goto err_free_cpumask;
812         }
813         per_cpu(processor_device_array, pr->id) = device;
814
815         per_cpu(processors, pr->id) = pr;
816
817         result = acpi_processor_add_fs(device);
818         if (result)
819                 goto err_free_cpumask;
820
821         sysdev = get_cpu_sysdev(pr->id);
822         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
823                 result = -EFAULT;
824                 goto err_remove_fs;
825         }
826
827         /* _PDC call should be done before doing anything else (if reqd.). */
828         arch_acpi_processor_init_pdc(pr);
829         acpi_processor_set_pdc(pr);
830         arch_acpi_processor_cleanup_pdc(pr);
831
832 #ifdef CONFIG_CPU_FREQ
833         acpi_processor_ppc_has_changed(pr);
834 #endif
835         acpi_processor_get_throttling_info(pr);
836         acpi_processor_get_limit_info(pr);
837
838
839         acpi_processor_power_init(pr, device);
840
841         pr->cdev = thermal_cooling_device_register("Processor", device,
842                                                 &processor_cooling_ops);
843         if (IS_ERR(pr->cdev)) {
844                 result = PTR_ERR(pr->cdev);
845                 goto err_power_exit;
846         }
847
848         dev_dbg(&device->dev, "registered as cooling_device%d\n",
849                  pr->cdev->id);
850
851         result = sysfs_create_link(&device->dev.kobj,
852                                    &pr->cdev->device.kobj,
853                                    "thermal_cooling");
854         if (result) {
855                 printk(KERN_ERR PREFIX "Create sysfs link\n");
856                 goto err_thermal_unregister;
857         }
858         result = sysfs_create_link(&pr->cdev->device.kobj,
859                                    &device->dev.kobj,
860                                    "device");
861         if (result) {
862                 printk(KERN_ERR PREFIX "Create sysfs link\n");
863                 goto err_remove_sysfs;
864         }
865
866         return 0;
867
868 err_remove_sysfs:
869         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
870 err_thermal_unregister:
871         thermal_cooling_device_unregister(pr->cdev);
872 err_power_exit:
873         acpi_processor_power_exit(pr, device);
874 err_remove_fs:
875         acpi_processor_remove_fs(device);
876 err_free_cpumask:
877         free_cpumask_var(pr->throttling.shared_cpu_map);
878
879         return result;
880 }
881
882 static int acpi_processor_remove(struct acpi_device *device, int type)
883 {
884         struct acpi_processor *pr = NULL;
885
886
887         if (!device || !acpi_driver_data(device))
888                 return -EINVAL;
889
890         pr = acpi_driver_data(device);
891
892         if (pr->id >= nr_cpu_ids)
893                 goto free;
894
895         if (type == ACPI_BUS_REMOVAL_EJECT) {
896                 if (acpi_processor_handle_eject(pr))
897                         return -EINVAL;
898         }
899
900         acpi_processor_power_exit(pr, device);
901
902         sysfs_remove_link(&device->dev.kobj, "sysdev");
903
904         acpi_processor_remove_fs(device);
905
906         if (pr->cdev) {
907                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
908                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
909                 thermal_cooling_device_unregister(pr->cdev);
910                 pr->cdev = NULL;
911         }
912
913         per_cpu(processors, pr->id) = NULL;
914         per_cpu(processor_device_array, pr->id) = NULL;
915
916 free:
917         free_cpumask_var(pr->throttling.shared_cpu_map);
918         kfree(pr);
919
920         return 0;
921 }
922
923 #ifdef CONFIG_ACPI_HOTPLUG_CPU
924 /****************************************************************************
925  *      Acpi processor hotplug support                                      *
926  ****************************************************************************/
927
928 static int is_processor_present(acpi_handle handle)
929 {
930         acpi_status status;
931         unsigned long long sta = 0;
932
933
934         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
935
936         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
937                 return 1;
938
939         /*
940          * _STA is mandatory for a processor that supports hot plug
941          */
942         if (status == AE_NOT_FOUND)
943                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
944                                 "Processor does not support hot plug\n"));
945         else
946                 ACPI_EXCEPTION((AE_INFO, status,
947                                 "Processor Device is not present"));
948         return 0;
949 }
950
951 static
952 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
953 {
954         acpi_handle phandle;
955         struct acpi_device *pdev;
956
957
958         if (acpi_get_parent(handle, &phandle)) {
959                 return -ENODEV;
960         }
961
962         if (acpi_bus_get_device(phandle, &pdev)) {
963                 return -ENODEV;
964         }
965
966         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
967                 return -ENODEV;
968         }
969
970         return 0;
971 }
972
973 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
974                                                 u32 event, void *data)
975 {
976         struct acpi_processor *pr;
977         struct acpi_device *device = NULL;
978         int result;
979
980
981         switch (event) {
982         case ACPI_NOTIFY_BUS_CHECK:
983         case ACPI_NOTIFY_DEVICE_CHECK:
984                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
985                 "Processor driver received %s event\n",
986                        (event == ACPI_NOTIFY_BUS_CHECK) ?
987                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
988
989                 if (!is_processor_present(handle))
990                         break;
991
992                 if (acpi_bus_get_device(handle, &device)) {
993                         result = acpi_processor_device_add(handle, &device);
994                         if (result)
995                                 printk(KERN_ERR PREFIX
996                                             "Unable to add the device\n");
997                         break;
998                 }
999                 break;
1000         case ACPI_NOTIFY_EJECT_REQUEST:
1001                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1002                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
1003
1004                 if (acpi_bus_get_device(handle, &device)) {
1005                         printk(KERN_ERR PREFIX
1006                                     "Device don't exist, dropping EJECT\n");
1007                         break;
1008                 }
1009                 pr = acpi_driver_data(device);
1010                 if (!pr) {
1011                         printk(KERN_ERR PREFIX
1012                                     "Driver data is NULL, dropping EJECT\n");
1013                         return;
1014                 }
1015                 break;
1016         default:
1017                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1018                                   "Unsupported event [0x%x]\n", event));
1019                 break;
1020         }
1021
1022         return;
1023 }
1024
1025 static acpi_status
1026 processor_walk_namespace_cb(acpi_handle handle,
1027                             u32 lvl, void *context, void **rv)
1028 {
1029         acpi_status status;
1030         int *action = context;
1031         acpi_object_type type = 0;
1032
1033         status = acpi_get_type(handle, &type);
1034         if (ACPI_FAILURE(status))
1035                 return (AE_OK);
1036
1037         if (type != ACPI_TYPE_PROCESSOR)
1038                 return (AE_OK);
1039
1040         switch (*action) {
1041         case INSTALL_NOTIFY_HANDLER:
1042                 acpi_install_notify_handler(handle,
1043                                             ACPI_SYSTEM_NOTIFY,
1044                                             acpi_processor_hotplug_notify,
1045                                             NULL);
1046                 break;
1047         case UNINSTALL_NOTIFY_HANDLER:
1048                 acpi_remove_notify_handler(handle,
1049                                            ACPI_SYSTEM_NOTIFY,
1050                                            acpi_processor_hotplug_notify);
1051                 break;
1052         default:
1053                 break;
1054         }
1055
1056         return (AE_OK);
1057 }
1058
1059 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1060 {
1061
1062         if (!is_processor_present(handle)) {
1063                 return AE_ERROR;
1064         }
1065
1066         if (acpi_map_lsapic(handle, p_cpu))
1067                 return AE_ERROR;
1068
1069         if (arch_register_cpu(*p_cpu)) {
1070                 acpi_unmap_lsapic(*p_cpu);
1071                 return AE_ERROR;
1072         }
1073
1074         return AE_OK;
1075 }
1076
1077 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1078 {
1079         if (cpu_online(pr->id))
1080                 cpu_down(pr->id);
1081
1082         arch_unregister_cpu(pr->id);
1083         acpi_unmap_lsapic(pr->id);
1084         return (0);
1085 }
1086 #else
1087 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1088 {
1089         return AE_ERROR;
1090 }
1091 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1092 {
1093         return (-EINVAL);
1094 }
1095 #endif
1096
1097 static
1098 void acpi_processor_install_hotplug_notify(void)
1099 {
1100 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1101         int action = INSTALL_NOTIFY_HANDLER;
1102         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1103                             ACPI_ROOT_OBJECT,
1104                             ACPI_UINT32_MAX,
1105                             processor_walk_namespace_cb, &action, NULL);
1106 #endif
1107         register_hotcpu_notifier(&acpi_cpu_notifier);
1108 }
1109
1110 static
1111 void acpi_processor_uninstall_hotplug_notify(void)
1112 {
1113 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1114         int action = UNINSTALL_NOTIFY_HANDLER;
1115         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1116                             ACPI_ROOT_OBJECT,
1117                             ACPI_UINT32_MAX,
1118                             processor_walk_namespace_cb, &action, NULL);
1119 #endif
1120         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1121 }
1122
1123 /*
1124  * We keep the driver loaded even when ACPI is not running.
1125  * This is needed for the powernow-k8 driver, that works even without
1126  * ACPI, but needs symbols from this driver
1127  */
1128
1129 static int __init acpi_processor_init(void)
1130 {
1131         int result = 0;
1132
1133         if (acpi_disabled)
1134                 return 0;
1135
1136         memset(&errata, 0, sizeof(errata));
1137
1138 #ifdef CONFIG_SMP
1139         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1140                                 (struct acpi_table_header **)&madt)))
1141                 madt = NULL;
1142 #endif
1143 #ifdef CONFIG_ACPI_PROCFS
1144         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1145         if (!acpi_processor_dir)
1146                 return -ENOMEM;
1147 #endif
1148         /*
1149          * Check whether the system is DMI table. If yes, OSPM
1150          * should not use mwait for CPU-states.
1151          */
1152         dmi_check_system(processor_idle_dmi_table);
1153         result = cpuidle_register_driver(&acpi_idle_driver);
1154         if (result < 0)
1155                 goto out_proc;
1156
1157         result = acpi_bus_register_driver(&acpi_processor_driver);
1158         if (result < 0)
1159                 goto out_cpuidle;
1160
1161         acpi_processor_install_hotplug_notify();
1162
1163         acpi_thermal_cpufreq_init();
1164
1165         acpi_processor_ppc_init();
1166
1167         acpi_processor_throttling_init();
1168
1169         return 0;
1170
1171 out_cpuidle:
1172         cpuidle_unregister_driver(&acpi_idle_driver);
1173
1174 out_proc:
1175 #ifdef CONFIG_ACPI_PROCFS
1176         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1177 #endif
1178
1179         return result;
1180 }
1181
1182 static void __exit acpi_processor_exit(void)
1183 {
1184         if (acpi_disabled)
1185                 return;
1186
1187         acpi_processor_ppc_exit();
1188
1189         acpi_thermal_cpufreq_exit();
1190
1191         acpi_processor_uninstall_hotplug_notify();
1192
1193         acpi_bus_unregister_driver(&acpi_processor_driver);
1194
1195         cpuidle_unregister_driver(&acpi_idle_driver);
1196
1197 #ifdef CONFIG_ACPI_PROCFS
1198         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1199 #endif
1200
1201         return;
1202 }
1203
1204 module_init(acpi_processor_init);
1205 module_exit(acpi_processor_exit);
1206
1207 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1208
1209 MODULE_ALIAS("processor");