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