[CPUFREQ] Processor Clocking Control interface driver
[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 EXPORT_PER_CPU_SYMBOL(processors);
127
128 struct acpi_processor_errata errata __read_mostly;
129 static int set_no_mwait(const struct dmi_system_id *id)
130 {
131         printk(KERN_NOTICE PREFIX "%s detected - "
132                 "disabling mwait for CPU C-states\n", id->ident);
133         idle_nomwait = 1;
134         return 0;
135 }
136
137 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
138         {
139         set_no_mwait, "IFL91 board", {
140         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
141         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
142         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
143         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
144         {
145         set_no_mwait, "Extensa 5220", {
146         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
147         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
148         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
149         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
150         {},
151 };
152
153 /* --------------------------------------------------------------------------
154                                 Errata Handling
155    -------------------------------------------------------------------------- */
156
157 static int acpi_processor_errata_piix4(struct pci_dev *dev)
158 {
159         u8 value1 = 0;
160         u8 value2 = 0;
161
162
163         if (!dev)
164                 return -EINVAL;
165
166         /*
167          * Note that 'dev' references the PIIX4 ACPI Controller.
168          */
169
170         switch (dev->revision) {
171         case 0:
172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
173                 break;
174         case 1:
175                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
176                 break;
177         case 2:
178                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
179                 break;
180         case 3:
181                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
182                 break;
183         default:
184                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
185                 break;
186         }
187
188         switch (dev->revision) {
189
190         case 0:         /* PIIX4 A-step */
191         case 1:         /* PIIX4 B-step */
192                 /*
193                  * See specification changes #13 ("Manual Throttle Duty Cycle")
194                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
195                  * erratum #5 ("STPCLK# Deassertion Time") from the January
196                  * 2002 PIIX4 specification update.  Applies to only older
197                  * PIIX4 models.
198                  */
199                 errata.piix4.throttle = 1;
200
201         case 2:         /* PIIX4E */
202         case 3:         /* PIIX4M */
203                 /*
204                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
205                  * Livelock") from the January 2002 PIIX4 specification update.
206                  * Applies to all PIIX4 models.
207                  */
208
209                 /*
210                  * BM-IDE
211                  * ------
212                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
213                  * Status register address.  We'll use this later to read
214                  * each IDE controller's DMA status to make sure we catch all
215                  * DMA activity.
216                  */
217                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
218                                      PCI_DEVICE_ID_INTEL_82371AB,
219                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
220                 if (dev) {
221                         errata.piix4.bmisx = pci_resource_start(dev, 4);
222                         pci_dev_put(dev);
223                 }
224
225                 /*
226                  * Type-F DMA
227                  * ----------
228                  * Find the PIIX4 ISA Controller and read the Motherboard
229                  * DMA controller's status to see if Type-F (Fast) DMA mode
230                  * is enabled (bit 7) on either channel.  Note that we'll
231                  * disable C3 support if this is enabled, as some legacy
232                  * devices won't operate well if fast DMA is disabled.
233                  */
234                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
235                                      PCI_DEVICE_ID_INTEL_82371AB_0,
236                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
237                 if (dev) {
238                         pci_read_config_byte(dev, 0x76, &value1);
239                         pci_read_config_byte(dev, 0x77, &value2);
240                         if ((value1 & 0x80) || (value2 & 0x80))
241                                 errata.piix4.fdma = 1;
242                         pci_dev_put(dev);
243                 }
244
245                 break;
246         }
247
248         if (errata.piix4.bmisx)
249                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
250                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
251         if (errata.piix4.fdma)
252                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
253                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
254
255         return 0;
256 }
257
258 static int acpi_processor_errata(struct acpi_processor *pr)
259 {
260         int result = 0;
261         struct pci_dev *dev = NULL;
262
263
264         if (!pr)
265                 return -EINVAL;
266
267         /*
268          * PIIX4
269          */
270         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
271                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
272                              PCI_ANY_ID, NULL);
273         if (dev) {
274                 result = acpi_processor_errata_piix4(dev);
275                 pci_dev_put(dev);
276         }
277
278         return result;
279 }
280
281 /* --------------------------------------------------------------------------
282                               Common ACPI processor functions
283    -------------------------------------------------------------------------- */
284
285 /*
286  * _PDC is required for a BIOS-OS handshake for most of the newer
287  * ACPI processor features.
288  */
289 static int acpi_processor_set_pdc(struct acpi_processor *pr)
290 {
291         struct acpi_object_list *pdc_in = pr->pdc;
292         acpi_status status = AE_OK;
293
294
295         if (!pdc_in)
296                 return status;
297         if (idle_nomwait) {
298                 /*
299                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
300                  * mode will be disabled in the parameter of _PDC object.
301                  * Of course C1_FFH access mode will also be disabled.
302                  */
303                 union acpi_object *obj;
304                 u32 *buffer = NULL;
305
306                 obj = pdc_in->pointer;
307                 buffer = (u32 *)(obj->buffer.pointer);
308                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
309
310         }
311         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
312
313         if (ACPI_FAILURE(status))
314                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
315                     "Could not evaluate _PDC, using legacy perf. control...\n"));
316
317         return status;
318 }
319
320 /* --------------------------------------------------------------------------
321                               FS Interface (/proc)
322    -------------------------------------------------------------------------- */
323
324 #ifdef CONFIG_ACPI_PROCFS
325 static struct proc_dir_entry *acpi_processor_dir = NULL;
326
327 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
328 {
329         struct acpi_processor *pr = seq->private;
330
331
332         if (!pr)
333                 goto end;
334
335         seq_printf(seq, "processor id:            %d\n"
336                    "acpi id:                 %d\n"
337                    "bus mastering control:   %s\n"
338                    "power management:        %s\n"
339                    "throttling control:      %s\n"
340                    "limit interface:         %s\n",
341                    pr->id,
342                    pr->acpi_id,
343                    pr->flags.bm_control ? "yes" : "no",
344                    pr->flags.power ? "yes" : "no",
345                    pr->flags.throttling ? "yes" : "no",
346                    pr->flags.limit ? "yes" : "no");
347
348       end:
349         return 0;
350 }
351
352 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
353 {
354         return single_open(file, acpi_processor_info_seq_show,
355                            PDE(inode)->data);
356 }
357
358 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
359 {
360         struct proc_dir_entry *entry = NULL;
361
362
363         if (!acpi_device_dir(device)) {
364                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
365                                                      acpi_processor_dir);
366                 if (!acpi_device_dir(device))
367                         return -ENODEV;
368         }
369
370         /* 'info' [R] */
371         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
372                                  S_IRUGO, acpi_device_dir(device),
373                                  &acpi_processor_info_fops,
374                                  acpi_driver_data(device));
375         if (!entry)
376                 return -EIO;
377
378         /* 'throttling' [R/W] */
379         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
380                                  S_IFREG | S_IRUGO | S_IWUSR,
381                                  acpi_device_dir(device),
382                                  &acpi_processor_throttling_fops,
383                                  acpi_driver_data(device));
384         if (!entry)
385                 return -EIO;
386
387         /* 'limit' [R/W] */
388         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
389                                  S_IFREG | S_IRUGO | S_IWUSR,
390                                  acpi_device_dir(device),
391                                  &acpi_processor_limit_fops,
392                                  acpi_driver_data(device));
393         if (!entry)
394                 return -EIO;
395         return 0;
396 }
397 static int acpi_processor_remove_fs(struct acpi_device *device)
398 {
399
400         if (acpi_device_dir(device)) {
401                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
402                                   acpi_device_dir(device));
403                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
404                                   acpi_device_dir(device));
405                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
406                                   acpi_device_dir(device));
407                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
408                 acpi_device_dir(device) = NULL;
409         }
410
411         return 0;
412 }
413 #else
414 static inline int acpi_processor_add_fs(struct acpi_device *device)
415 {
416         return 0;
417 }
418 static inline int acpi_processor_remove_fs(struct acpi_device *device)
419 {
420         return 0;
421 }
422 #endif
423
424 /* Use the acpiid in MADT to map cpus in case of SMP */
425
426 #ifndef CONFIG_SMP
427 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
428 #else
429
430 static struct acpi_table_madt *madt;
431
432 static int map_lapic_id(struct acpi_subtable_header *entry,
433                  u32 acpi_id, int *apic_id)
434 {
435         struct acpi_madt_local_apic *lapic =
436                 (struct acpi_madt_local_apic *)entry;
437         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
438             lapic->processor_id == acpi_id) {
439                 *apic_id = lapic->id;
440                 return 1;
441         }
442         return 0;
443 }
444
445 static int map_x2apic_id(struct acpi_subtable_header *entry,
446                          int device_declaration, u32 acpi_id, int *apic_id)
447 {
448         struct acpi_madt_local_x2apic *apic =
449                 (struct acpi_madt_local_x2apic *)entry;
450         u32 tmp = apic->local_apic_id;
451
452         /* Only check enabled APICs*/
453         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
454                 return 0;
455
456         /* Device statement declaration type */
457         if (device_declaration) {
458                 if (apic->uid == acpi_id)
459                         goto found;
460         }
461
462         return 0;
463 found:
464         *apic_id = tmp;
465         return 1;
466 }
467
468 static int map_lsapic_id(struct acpi_subtable_header *entry,
469                 int device_declaration, u32 acpi_id, int *apic_id)
470 {
471         struct acpi_madt_local_sapic *lsapic =
472                 (struct acpi_madt_local_sapic *)entry;
473         u32 tmp = (lsapic->id << 8) | lsapic->eid;
474
475         /* Only check enabled APICs*/
476         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
477                 return 0;
478
479         /* Device statement declaration type */
480         if (device_declaration) {
481                 if (entry->length < 16)
482                         printk(KERN_ERR PREFIX
483                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
484                             tmp);
485                 else if (lsapic->uid == acpi_id)
486                         goto found;
487         /* Processor statement declaration type */
488         } else if (lsapic->processor_id == acpi_id)
489                 goto found;
490
491         return 0;
492 found:
493         *apic_id = tmp;
494         return 1;
495 }
496
497 static int map_madt_entry(int type, u32 acpi_id)
498 {
499         unsigned long madt_end, entry;
500         int apic_id = -1;
501
502         if (!madt)
503                 return apic_id;
504
505         entry = (unsigned long)madt;
506         madt_end = entry + madt->header.length;
507
508         /* Parse all entries looking for a match. */
509
510         entry += sizeof(struct acpi_table_madt);
511         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
512                 struct acpi_subtable_header *header =
513                         (struct acpi_subtable_header *)entry;
514                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
515                         if (map_lapic_id(header, acpi_id, &apic_id))
516                                 break;
517                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
518                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
519                                 break;
520                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
521                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
522                                 break;
523                 }
524                 entry += header->length;
525         }
526         return apic_id;
527 }
528
529 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
530 {
531         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
532         union acpi_object *obj;
533         struct acpi_subtable_header *header;
534         int apic_id = -1;
535
536         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
537                 goto exit;
538
539         if (!buffer.length || !buffer.pointer)
540                 goto exit;
541
542         obj = buffer.pointer;
543         if (obj->type != ACPI_TYPE_BUFFER ||
544             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
545                 goto exit;
546         }
547
548         header = (struct acpi_subtable_header *)obj->buffer.pointer;
549         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
550                 map_lapic_id(header, acpi_id, &apic_id);
551         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
552                 map_lsapic_id(header, type, acpi_id, &apic_id);
553         }
554
555 exit:
556         if (buffer.pointer)
557                 kfree(buffer.pointer);
558         return apic_id;
559 }
560
561 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
562 {
563         int i;
564         int apic_id = -1;
565
566         apic_id = map_mat_entry(handle, type, acpi_id);
567         if (apic_id == -1)
568                 apic_id = map_madt_entry(type, acpi_id);
569         if (apic_id == -1)
570                 return apic_id;
571
572         for_each_possible_cpu(i) {
573                 if (cpu_physical_id(i) == apic_id)
574                         return i;
575         }
576         return -1;
577 }
578 #endif
579
580 /* --------------------------------------------------------------------------
581                                  Driver Interface
582    -------------------------------------------------------------------------- */
583
584 static int acpi_processor_get_info(struct acpi_device *device)
585 {
586         acpi_status status = 0;
587         union acpi_object object = { 0 };
588         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
589         struct acpi_processor *pr;
590         int cpu_index, device_declaration = 0;
591         static int cpu0_initialized;
592
593         pr = acpi_driver_data(device);
594         if (!pr)
595                 return -EINVAL;
596
597         if (num_online_cpus() > 1)
598                 errata.smp = TRUE;
599
600         acpi_processor_errata(pr);
601
602         /*
603          * Check to see if we have bus mastering arbitration control.  This
604          * is required for proper C3 usage (to maintain cache coherency).
605          */
606         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
607                 pr->flags.bm_control = 1;
608                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
609                                   "Bus mastering arbitration control present\n"));
610         } else
611                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
612                                   "No bus mastering arbitration control\n"));
613
614         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
615                 /* Declared with "Processor" statement; match ProcessorID */
616                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
617                 if (ACPI_FAILURE(status)) {
618                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
619                         return -ENODEV;
620                 }
621
622                 /*
623                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
624                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
625                  *      arch/xxx/acpi.c
626                  */
627                 pr->acpi_id = object.processor.proc_id;
628         } else {
629                 /*
630                  * Declared with "Device" statement; match _UID.
631                  * Note that we don't handle string _UIDs yet.
632                  */
633                 unsigned long long value;
634                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
635                                                 NULL, &value);
636                 if (ACPI_FAILURE(status)) {
637                         printk(KERN_ERR PREFIX
638                             "Evaluating processor _UID [%#x]\n", status);
639                         return -ENODEV;
640                 }
641                 device_declaration = 1;
642                 pr->acpi_id = value;
643         }
644         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
645
646         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
647         if (!cpu0_initialized && (cpu_index == -1) &&
648             (num_online_cpus() == 1)) {
649                 cpu_index = 0;
650         }
651
652         cpu0_initialized = 1;
653
654         pr->id = cpu_index;
655
656         /*
657          *  Extra Processor objects may be enumerated on MP systems with
658          *  less than the max # of CPUs. They should be ignored _iff
659          *  they are physically not present.
660          */
661         if (pr->id == -1) {
662                 if (ACPI_FAILURE
663                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
664                         return -ENODEV;
665                 }
666         }
667         /*
668          * On some boxes several processors use the same processor bus id.
669          * But they are located in different scope. For example:
670          * \_SB.SCK0.CPU0
671          * \_SB.SCK1.CPU0
672          * Rename the processor device bus id. And the new bus id will be
673          * generated as the following format:
674          * CPU+CPU ID.
675          */
676         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
677         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
678                           pr->acpi_id));
679
680         if (!object.processor.pblk_address)
681                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
682         else if (object.processor.pblk_length != 6)
683                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
684                             object.processor.pblk_length);
685         else {
686                 pr->throttling.address = object.processor.pblk_address;
687                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
688                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
689
690                 pr->pblk = object.processor.pblk_address;
691
692                 /*
693                  * We don't care about error returns - we just try to mark
694                  * these reserved so that nobody else is confused into thinking
695                  * that this region might be unused..
696                  *
697                  * (In particular, allocating the IO range for Cardbus)
698                  */
699                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
700         }
701
702         /*
703          * If ACPI describes a slot number for this CPU, we can use it
704          * ensure we get the right value in the "physical id" field
705          * of /proc/cpuinfo
706          */
707         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
708         if (ACPI_SUCCESS(status))
709                 arch_fix_phys_package_id(pr->id, object.integer.value);
710
711         return 0;
712 }
713
714 static DEFINE_PER_CPU(void *, processor_device_array);
715
716 static void acpi_processor_notify(struct acpi_device *device, u32 event)
717 {
718         struct acpi_processor *pr = acpi_driver_data(device);
719         int saved;
720
721         if (!pr)
722                 return;
723
724         switch (event) {
725         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
726                 saved = pr->performance_platform_limit;
727                 acpi_processor_ppc_has_changed(pr, 1);
728                 if (saved == pr->performance_platform_limit)
729                         break;
730                 acpi_bus_generate_proc_event(device, event,
731                                         pr->performance_platform_limit);
732                 acpi_bus_generate_netlink_event(device->pnp.device_class,
733                                                   dev_name(&device->dev), event,
734                                                   pr->performance_platform_limit);
735                 break;
736         case ACPI_PROCESSOR_NOTIFY_POWER:
737                 acpi_processor_cst_has_changed(pr);
738                 acpi_bus_generate_proc_event(device, event, 0);
739                 acpi_bus_generate_netlink_event(device->pnp.device_class,
740                                                   dev_name(&device->dev), event, 0);
741                 break;
742         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
743                 acpi_processor_tstate_has_changed(pr);
744                 acpi_bus_generate_proc_event(device, event, 0);
745                 acpi_bus_generate_netlink_event(device->pnp.device_class,
746                                                   dev_name(&device->dev), event, 0);
747         default:
748                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
749                                   "Unsupported event [0x%x]\n", event));
750                 break;
751         }
752
753         return;
754 }
755
756 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
757                 unsigned long action, void *hcpu)
758 {
759         unsigned int cpu = (unsigned long)hcpu;
760         struct acpi_processor *pr = per_cpu(processors, cpu);
761
762         if (action == CPU_ONLINE && pr) {
763                 acpi_processor_ppc_has_changed(pr, 0);
764                 acpi_processor_cst_has_changed(pr);
765                 acpi_processor_tstate_has_changed(pr);
766         }
767         return NOTIFY_OK;
768 }
769
770 static struct notifier_block acpi_cpu_notifier =
771 {
772             .notifier_call = acpi_cpu_soft_notify,
773 };
774
775 static int __cpuinit acpi_processor_add(struct acpi_device *device)
776 {
777         struct acpi_processor *pr = NULL;
778         int result = 0;
779         struct sys_device *sysdev;
780
781         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
782         if (!pr)
783                 return -ENOMEM;
784
785         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
786                 kfree(pr);
787                 return -ENOMEM;
788         }
789
790         pr->handle = device->handle;
791         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
792         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
793         device->driver_data = pr;
794
795         result = acpi_processor_get_info(device);
796         if (result) {
797                 /* Processor is physically not present */
798                 return 0;
799         }
800
801         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
802
803         /*
804          * Buggy BIOS check
805          * ACPI id of processors can be reported wrongly by the BIOS.
806          * Don't trust it blindly
807          */
808         if (per_cpu(processor_device_array, pr->id) != NULL &&
809             per_cpu(processor_device_array, pr->id) != device) {
810                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
811                         "for the processor\n");
812                 result = -ENODEV;
813                 goto err_free_cpumask;
814         }
815         per_cpu(processor_device_array, pr->id) = device;
816
817         per_cpu(processors, pr->id) = pr;
818
819         result = acpi_processor_add_fs(device);
820         if (result)
821                 goto err_free_cpumask;
822
823         sysdev = get_cpu_sysdev(pr->id);
824         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
825                 result = -EFAULT;
826                 goto err_remove_fs;
827         }
828
829         /* _PDC call should be done before doing anything else (if reqd.). */
830         arch_acpi_processor_init_pdc(pr);
831         acpi_processor_set_pdc(pr);
832         arch_acpi_processor_cleanup_pdc(pr);
833
834 #ifdef CONFIG_CPU_FREQ
835         acpi_processor_ppc_has_changed(pr, 0);
836 #endif
837         acpi_processor_get_throttling_info(pr);
838         acpi_processor_get_limit_info(pr);
839
840
841         acpi_processor_power_init(pr, device);
842
843         pr->cdev = thermal_cooling_device_register("Processor", device,
844                                                 &processor_cooling_ops);
845         if (IS_ERR(pr->cdev)) {
846                 result = PTR_ERR(pr->cdev);
847                 goto err_power_exit;
848         }
849
850         dev_dbg(&device->dev, "registered as cooling_device%d\n",
851                  pr->cdev->id);
852
853         result = sysfs_create_link(&device->dev.kobj,
854                                    &pr->cdev->device.kobj,
855                                    "thermal_cooling");
856         if (result) {
857                 printk(KERN_ERR PREFIX "Create sysfs link\n");
858                 goto err_thermal_unregister;
859         }
860         result = sysfs_create_link(&pr->cdev->device.kobj,
861                                    &device->dev.kobj,
862                                    "device");
863         if (result) {
864                 printk(KERN_ERR PREFIX "Create sysfs link\n");
865                 goto err_remove_sysfs;
866         }
867
868         return 0;
869
870 err_remove_sysfs:
871         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
872 err_thermal_unregister:
873         thermal_cooling_device_unregister(pr->cdev);
874 err_power_exit:
875         acpi_processor_power_exit(pr, device);
876 err_remove_fs:
877         acpi_processor_remove_fs(device);
878 err_free_cpumask:
879         free_cpumask_var(pr->throttling.shared_cpu_map);
880
881         return result;
882 }
883
884 static int acpi_processor_remove(struct acpi_device *device, int type)
885 {
886         struct acpi_processor *pr = NULL;
887
888
889         if (!device || !acpi_driver_data(device))
890                 return -EINVAL;
891
892         pr = acpi_driver_data(device);
893
894         if (pr->id >= nr_cpu_ids)
895                 goto free;
896
897         if (type == ACPI_BUS_REMOVAL_EJECT) {
898                 if (acpi_processor_handle_eject(pr))
899                         return -EINVAL;
900         }
901
902         acpi_processor_power_exit(pr, device);
903
904         sysfs_remove_link(&device->dev.kobj, "sysdev");
905
906         acpi_processor_remove_fs(device);
907
908         if (pr->cdev) {
909                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
910                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
911                 thermal_cooling_device_unregister(pr->cdev);
912                 pr->cdev = NULL;
913         }
914
915         per_cpu(processors, pr->id) = NULL;
916         per_cpu(processor_device_array, pr->id) = NULL;
917
918 free:
919         free_cpumask_var(pr->throttling.shared_cpu_map);
920         kfree(pr);
921
922         return 0;
923 }
924
925 #ifdef CONFIG_ACPI_HOTPLUG_CPU
926 /****************************************************************************
927  *      Acpi processor hotplug support                                      *
928  ****************************************************************************/
929
930 static int is_processor_present(acpi_handle handle)
931 {
932         acpi_status status;
933         unsigned long long sta = 0;
934
935
936         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
937
938         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
939                 return 1;
940
941         /*
942          * _STA is mandatory for a processor that supports hot plug
943          */
944         if (status == AE_NOT_FOUND)
945                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
946                                 "Processor does not support hot plug\n"));
947         else
948                 ACPI_EXCEPTION((AE_INFO, status,
949                                 "Processor Device is not present"));
950         return 0;
951 }
952
953 static
954 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
955 {
956         acpi_handle phandle;
957         struct acpi_device *pdev;
958
959
960         if (acpi_get_parent(handle, &phandle)) {
961                 return -ENODEV;
962         }
963
964         if (acpi_bus_get_device(phandle, &pdev)) {
965                 return -ENODEV;
966         }
967
968         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
969                 return -ENODEV;
970         }
971
972         return 0;
973 }
974
975 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
976                                                 u32 event, void *data)
977 {
978         struct acpi_processor *pr;
979         struct acpi_device *device = NULL;
980         int result;
981
982
983         switch (event) {
984         case ACPI_NOTIFY_BUS_CHECK:
985         case ACPI_NOTIFY_DEVICE_CHECK:
986                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
987                 "Processor driver received %s event\n",
988                        (event == ACPI_NOTIFY_BUS_CHECK) ?
989                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
990
991                 if (!is_processor_present(handle))
992                         break;
993
994                 if (acpi_bus_get_device(handle, &device)) {
995                         result = acpi_processor_device_add(handle, &device);
996                         if (result)
997                                 printk(KERN_ERR PREFIX
998                                             "Unable to add the device\n");
999                         break;
1000                 }
1001                 break;
1002         case ACPI_NOTIFY_EJECT_REQUEST:
1003                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1004                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
1005
1006                 if (acpi_bus_get_device(handle, &device)) {
1007                         printk(KERN_ERR PREFIX
1008                                     "Device don't exist, dropping EJECT\n");
1009                         break;
1010                 }
1011                 pr = acpi_driver_data(device);
1012                 if (!pr) {
1013                         printk(KERN_ERR PREFIX
1014                                     "Driver data is NULL, dropping EJECT\n");
1015                         return;
1016                 }
1017                 break;
1018         default:
1019                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1020                                   "Unsupported event [0x%x]\n", event));
1021                 break;
1022         }
1023
1024         return;
1025 }
1026
1027 static acpi_status
1028 processor_walk_namespace_cb(acpi_handle handle,
1029                             u32 lvl, void *context, void **rv)
1030 {
1031         acpi_status status;
1032         int *action = context;
1033         acpi_object_type type = 0;
1034
1035         status = acpi_get_type(handle, &type);
1036         if (ACPI_FAILURE(status))
1037                 return (AE_OK);
1038
1039         if (type != ACPI_TYPE_PROCESSOR)
1040                 return (AE_OK);
1041
1042         switch (*action) {
1043         case INSTALL_NOTIFY_HANDLER:
1044                 acpi_install_notify_handler(handle,
1045                                             ACPI_SYSTEM_NOTIFY,
1046                                             acpi_processor_hotplug_notify,
1047                                             NULL);
1048                 break;
1049         case UNINSTALL_NOTIFY_HANDLER:
1050                 acpi_remove_notify_handler(handle,
1051                                            ACPI_SYSTEM_NOTIFY,
1052                                            acpi_processor_hotplug_notify);
1053                 break;
1054         default:
1055                 break;
1056         }
1057
1058         return (AE_OK);
1059 }
1060
1061 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1062 {
1063
1064         if (!is_processor_present(handle)) {
1065                 return AE_ERROR;
1066         }
1067
1068         if (acpi_map_lsapic(handle, p_cpu))
1069                 return AE_ERROR;
1070
1071         if (arch_register_cpu(*p_cpu)) {
1072                 acpi_unmap_lsapic(*p_cpu);
1073                 return AE_ERROR;
1074         }
1075
1076         return AE_OK;
1077 }
1078
1079 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1080 {
1081         if (cpu_online(pr->id))
1082                 cpu_down(pr->id);
1083
1084         arch_unregister_cpu(pr->id);
1085         acpi_unmap_lsapic(pr->id);
1086         return (0);
1087 }
1088 #else
1089 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1090 {
1091         return AE_ERROR;
1092 }
1093 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1094 {
1095         return (-EINVAL);
1096 }
1097 #endif
1098
1099 static
1100 void acpi_processor_install_hotplug_notify(void)
1101 {
1102 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1103         int action = INSTALL_NOTIFY_HANDLER;
1104         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1105                             ACPI_ROOT_OBJECT,
1106                             ACPI_UINT32_MAX,
1107                             processor_walk_namespace_cb, NULL, &action, NULL);
1108 #endif
1109         register_hotcpu_notifier(&acpi_cpu_notifier);
1110 }
1111
1112 static
1113 void acpi_processor_uninstall_hotplug_notify(void)
1114 {
1115 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1116         int action = UNINSTALL_NOTIFY_HANDLER;
1117         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1118                             ACPI_ROOT_OBJECT,
1119                             ACPI_UINT32_MAX,
1120                             processor_walk_namespace_cb, NULL, &action, NULL);
1121 #endif
1122         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1123 }
1124
1125 /*
1126  * We keep the driver loaded even when ACPI is not running.
1127  * This is needed for the powernow-k8 driver, that works even without
1128  * ACPI, but needs symbols from this driver
1129  */
1130
1131 static int __init acpi_processor_init(void)
1132 {
1133         int result = 0;
1134
1135         if (acpi_disabled)
1136                 return 0;
1137
1138         memset(&errata, 0, sizeof(errata));
1139
1140 #ifdef CONFIG_SMP
1141         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1142                                 (struct acpi_table_header **)&madt)))
1143                 madt = NULL;
1144 #endif
1145 #ifdef CONFIG_ACPI_PROCFS
1146         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1147         if (!acpi_processor_dir)
1148                 return -ENOMEM;
1149 #endif
1150         /*
1151          * Check whether the system is DMI table. If yes, OSPM
1152          * should not use mwait for CPU-states.
1153          */
1154         dmi_check_system(processor_idle_dmi_table);
1155         result = cpuidle_register_driver(&acpi_idle_driver);
1156         if (result < 0)
1157                 goto out_proc;
1158
1159         result = acpi_bus_register_driver(&acpi_processor_driver);
1160         if (result < 0)
1161                 goto out_cpuidle;
1162
1163         acpi_processor_install_hotplug_notify();
1164
1165         acpi_thermal_cpufreq_init();
1166
1167         acpi_processor_ppc_init();
1168
1169         acpi_processor_throttling_init();
1170
1171         return 0;
1172
1173 out_cpuidle:
1174         cpuidle_unregister_driver(&acpi_idle_driver);
1175
1176 out_proc:
1177 #ifdef CONFIG_ACPI_PROCFS
1178         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1179 #endif
1180
1181         return result;
1182 }
1183
1184 static void __exit acpi_processor_exit(void)
1185 {
1186         if (acpi_disabled)
1187                 return;
1188
1189         acpi_processor_ppc_exit();
1190
1191         acpi_thermal_cpufreq_exit();
1192
1193         acpi_processor_uninstall_hotplug_notify();
1194
1195         acpi_bus_unregister_driver(&acpi_processor_driver);
1196
1197         cpuidle_unregister_driver(&acpi_idle_driver);
1198
1199 #ifdef CONFIG_ACPI_PROCFS
1200         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1201 #endif
1202
1203         return;
1204 }
1205
1206 module_init(acpi_processor_init);
1207 module_exit(acpi_processor_exit);
1208
1209 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1210
1211 MODULE_ALIAS("processor");