Merge git://git.infradead.org/iommu-2.6
[linux-2.6] / 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 ACPI_PROCESSOR_CLASS            "processor"
63 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
64 #define ACPI_PROCESSOR_FILE_INFO        "info"
65 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
66 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
68 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
69 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
70
71 #define ACPI_PROCESSOR_LIMIT_USER       0
72 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
73
74 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
75 ACPI_MODULE_NAME("processor_core");
76
77 MODULE_AUTHOR("Paul Diefenbaugh");
78 MODULE_DESCRIPTION("ACPI Processor Driver");
79 MODULE_LICENSE("GPL");
80
81 static int acpi_processor_add(struct acpi_device *device);
82 static int acpi_processor_start(struct acpi_device *device);
83 static int acpi_processor_remove(struct acpi_device *device, int type);
84 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
85 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
86 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
87 static int acpi_processor_handle_eject(struct acpi_processor *pr);
88
89
90 static const struct acpi_device_id processor_device_ids[] = {
91         {ACPI_PROCESSOR_OBJECT_HID, 0},
92         {ACPI_PROCESSOR_HID, 0},
93         {"", 0},
94 };
95 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
96
97 static struct acpi_driver acpi_processor_driver = {
98         .name = "processor",
99         .class = ACPI_PROCESSOR_CLASS,
100         .ids = processor_device_ids,
101         .ops = {
102                 .add = acpi_processor_add,
103                 .remove = acpi_processor_remove,
104                 .start = acpi_processor_start,
105                 .suspend = acpi_processor_suspend,
106                 .resume = acpi_processor_resume,
107                 },
108 };
109
110 #define INSTALL_NOTIFY_HANDLER          1
111 #define UNINSTALL_NOTIFY_HANDLER        2
112
113 static const struct file_operations acpi_processor_info_fops = {
114         .owner = THIS_MODULE,
115         .open = acpi_processor_info_open_fs,
116         .read = seq_read,
117         .llseek = seq_lseek,
118         .release = single_release,
119 };
120
121 DEFINE_PER_CPU(struct acpi_processor *, processors);
122 struct acpi_processor_errata errata __read_mostly;
123 static int set_no_mwait(const struct dmi_system_id *id)
124 {
125         printk(KERN_NOTICE PREFIX "%s detected - "
126                 "disabling mwait for CPU C-states\n", id->ident);
127         idle_nomwait = 1;
128         return 0;
129 }
130
131 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
132         {
133         set_no_mwait, "IFL91 board", {
134         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
135         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
136         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
137         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
138         {
139         set_no_mwait, "Extensa 5220", {
140         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
141         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
142         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
143         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
144         {},
145 };
146
147 /* --------------------------------------------------------------------------
148                                 Errata Handling
149    -------------------------------------------------------------------------- */
150
151 static int acpi_processor_errata_piix4(struct pci_dev *dev)
152 {
153         u8 value1 = 0;
154         u8 value2 = 0;
155
156
157         if (!dev)
158                 return -EINVAL;
159
160         /*
161          * Note that 'dev' references the PIIX4 ACPI Controller.
162          */
163
164         switch (dev->revision) {
165         case 0:
166                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
167                 break;
168         case 1:
169                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
170                 break;
171         case 2:
172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
173                 break;
174         case 3:
175                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
176                 break;
177         default:
178                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
179                 break;
180         }
181
182         switch (dev->revision) {
183
184         case 0:         /* PIIX4 A-step */
185         case 1:         /* PIIX4 B-step */
186                 /*
187                  * See specification changes #13 ("Manual Throttle Duty Cycle")
188                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
189                  * erratum #5 ("STPCLK# Deassertion Time") from the January
190                  * 2002 PIIX4 specification update.  Applies to only older
191                  * PIIX4 models.
192                  */
193                 errata.piix4.throttle = 1;
194
195         case 2:         /* PIIX4E */
196         case 3:         /* PIIX4M */
197                 /*
198                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
199                  * Livelock") from the January 2002 PIIX4 specification update.
200                  * Applies to all PIIX4 models.
201                  */
202
203                 /*
204                  * BM-IDE
205                  * ------
206                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
207                  * Status register address.  We'll use this later to read
208                  * each IDE controller's DMA status to make sure we catch all
209                  * DMA activity.
210                  */
211                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
212                                      PCI_DEVICE_ID_INTEL_82371AB,
213                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
214                 if (dev) {
215                         errata.piix4.bmisx = pci_resource_start(dev, 4);
216                         pci_dev_put(dev);
217                 }
218
219                 /*
220                  * Type-F DMA
221                  * ----------
222                  * Find the PIIX4 ISA Controller and read the Motherboard
223                  * DMA controller's status to see if Type-F (Fast) DMA mode
224                  * is enabled (bit 7) on either channel.  Note that we'll
225                  * disable C3 support if this is enabled, as some legacy
226                  * devices won't operate well if fast DMA is disabled.
227                  */
228                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
229                                      PCI_DEVICE_ID_INTEL_82371AB_0,
230                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
231                 if (dev) {
232                         pci_read_config_byte(dev, 0x76, &value1);
233                         pci_read_config_byte(dev, 0x77, &value2);
234                         if ((value1 & 0x80) || (value2 & 0x80))
235                                 errata.piix4.fdma = 1;
236                         pci_dev_put(dev);
237                 }
238
239                 break;
240         }
241
242         if (errata.piix4.bmisx)
243                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
244                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
245         if (errata.piix4.fdma)
246                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
247                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
248
249         return 0;
250 }
251
252 static int acpi_processor_errata(struct acpi_processor *pr)
253 {
254         int result = 0;
255         struct pci_dev *dev = NULL;
256
257
258         if (!pr)
259                 return -EINVAL;
260
261         /*
262          * PIIX4
263          */
264         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
265                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
266                              PCI_ANY_ID, NULL);
267         if (dev) {
268                 result = acpi_processor_errata_piix4(dev);
269                 pci_dev_put(dev);
270         }
271
272         return result;
273 }
274
275 /* --------------------------------------------------------------------------
276                               Common ACPI processor functions
277    -------------------------------------------------------------------------- */
278
279 /*
280  * _PDC is required for a BIOS-OS handshake for most of the newer
281  * ACPI processor features.
282  */
283 static int acpi_processor_set_pdc(struct acpi_processor *pr)
284 {
285         struct acpi_object_list *pdc_in = pr->pdc;
286         acpi_status status = AE_OK;
287
288
289         if (!pdc_in)
290                 return status;
291         if (idle_nomwait) {
292                 /*
293                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
294                  * mode will be disabled in the parameter of _PDC object.
295                  * Of course C1_FFH access mode will also be disabled.
296                  */
297                 union acpi_object *obj;
298                 u32 *buffer = NULL;
299
300                 obj = pdc_in->pointer;
301                 buffer = (u32 *)(obj->buffer.pointer);
302                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
303
304         }
305         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
306
307         if (ACPI_FAILURE(status))
308                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
309                     "Could not evaluate _PDC, using legacy perf. control...\n"));
310
311         return status;
312 }
313
314 /* --------------------------------------------------------------------------
315                               FS Interface (/proc)
316    -------------------------------------------------------------------------- */
317
318 static struct proc_dir_entry *acpi_processor_dir = NULL;
319
320 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
321 {
322         struct acpi_processor *pr = seq->private;
323
324
325         if (!pr)
326                 goto end;
327
328         seq_printf(seq, "processor id:            %d\n"
329                    "acpi id:                 %d\n"
330                    "bus mastering control:   %s\n"
331                    "power management:        %s\n"
332                    "throttling control:      %s\n"
333                    "limit interface:         %s\n",
334                    pr->id,
335                    pr->acpi_id,
336                    pr->flags.bm_control ? "yes" : "no",
337                    pr->flags.power ? "yes" : "no",
338                    pr->flags.throttling ? "yes" : "no",
339                    pr->flags.limit ? "yes" : "no");
340
341       end:
342         return 0;
343 }
344
345 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
346 {
347         return single_open(file, acpi_processor_info_seq_show,
348                            PDE(inode)->data);
349 }
350
351 static int acpi_processor_add_fs(struct acpi_device *device)
352 {
353         struct proc_dir_entry *entry = NULL;
354
355
356         if (!acpi_device_dir(device)) {
357                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
358                                                      acpi_processor_dir);
359                 if (!acpi_device_dir(device))
360                         return -ENODEV;
361         }
362
363         /* 'info' [R] */
364         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
365                                  S_IRUGO, acpi_device_dir(device),
366                                  &acpi_processor_info_fops,
367                                  acpi_driver_data(device));
368         if (!entry)
369                 return -EIO;
370
371         /* 'throttling' [R/W] */
372         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
373                                  S_IFREG | S_IRUGO | S_IWUSR,
374                                  acpi_device_dir(device),
375                                  &acpi_processor_throttling_fops,
376                                  acpi_driver_data(device));
377         if (!entry)
378                 return -EIO;
379
380         /* 'limit' [R/W] */
381         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
382                                  S_IFREG | S_IRUGO | S_IWUSR,
383                                  acpi_device_dir(device),
384                                  &acpi_processor_limit_fops,
385                                  acpi_driver_data(device));
386         if (!entry)
387                 return -EIO;
388         return 0;
389 }
390
391 static int acpi_processor_remove_fs(struct acpi_device *device)
392 {
393
394         if (acpi_device_dir(device)) {
395                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
396                                   acpi_device_dir(device));
397                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
398                                   acpi_device_dir(device));
399                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
400                                   acpi_device_dir(device));
401                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
402                 acpi_device_dir(device) = NULL;
403         }
404
405         return 0;
406 }
407
408 /* Use the acpiid in MADT to map cpus in case of SMP */
409
410 #ifndef CONFIG_SMP
411 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
412 #else
413
414 static struct acpi_table_madt *madt;
415
416 static int map_lapic_id(struct acpi_subtable_header *entry,
417                  u32 acpi_id, int *apic_id)
418 {
419         struct acpi_madt_local_apic *lapic =
420                 (struct acpi_madt_local_apic *)entry;
421         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
422             lapic->processor_id == acpi_id) {
423                 *apic_id = lapic->id;
424                 return 1;
425         }
426         return 0;
427 }
428
429 static int map_lsapic_id(struct acpi_subtable_header *entry,
430                 int device_declaration, u32 acpi_id, int *apic_id)
431 {
432         struct acpi_madt_local_sapic *lsapic =
433                 (struct acpi_madt_local_sapic *)entry;
434         u32 tmp = (lsapic->id << 8) | lsapic->eid;
435
436         /* Only check enabled APICs*/
437         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
438                 return 0;
439
440         /* Device statement declaration type */
441         if (device_declaration) {
442                 if (entry->length < 16)
443                         printk(KERN_ERR PREFIX
444                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
445                             tmp);
446                 else if (lsapic->uid == acpi_id)
447                         goto found;
448         /* Processor statement declaration type */
449         } else if (lsapic->processor_id == acpi_id)
450                 goto found;
451
452         return 0;
453 found:
454         *apic_id = tmp;
455         return 1;
456 }
457
458 static int map_madt_entry(int type, u32 acpi_id)
459 {
460         unsigned long madt_end, entry;
461         int apic_id = -1;
462
463         if (!madt)
464                 return apic_id;
465
466         entry = (unsigned long)madt;
467         madt_end = entry + madt->header.length;
468
469         /* Parse all entries looking for a match. */
470
471         entry += sizeof(struct acpi_table_madt);
472         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
473                 struct acpi_subtable_header *header =
474                         (struct acpi_subtable_header *)entry;
475                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
476                         if (map_lapic_id(header, acpi_id, &apic_id))
477                                 break;
478                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
479                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
480                                 break;
481                 }
482                 entry += header->length;
483         }
484         return apic_id;
485 }
486
487 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
488 {
489         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
490         union acpi_object *obj;
491         struct acpi_subtable_header *header;
492         int apic_id = -1;
493
494         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
495                 goto exit;
496
497         if (!buffer.length || !buffer.pointer)
498                 goto exit;
499
500         obj = buffer.pointer;
501         if (obj->type != ACPI_TYPE_BUFFER ||
502             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
503                 goto exit;
504         }
505
506         header = (struct acpi_subtable_header *)obj->buffer.pointer;
507         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
508                 map_lapic_id(header, acpi_id, &apic_id);
509         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
510                 map_lsapic_id(header, type, acpi_id, &apic_id);
511         }
512
513 exit:
514         if (buffer.pointer)
515                 kfree(buffer.pointer);
516         return apic_id;
517 }
518
519 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
520 {
521         int i;
522         int apic_id = -1;
523
524         apic_id = map_mat_entry(handle, type, acpi_id);
525         if (apic_id == -1)
526                 apic_id = map_madt_entry(type, acpi_id);
527         if (apic_id == -1)
528                 return apic_id;
529
530         for_each_possible_cpu(i) {
531                 if (cpu_physical_id(i) == apic_id)
532                         return i;
533         }
534         return -1;
535 }
536 #endif
537
538 /* --------------------------------------------------------------------------
539                                  Driver Interface
540    -------------------------------------------------------------------------- */
541
542 static int acpi_processor_get_info(struct acpi_device *device)
543 {
544         acpi_status status = 0;
545         union acpi_object object = { 0 };
546         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
547         struct acpi_processor *pr;
548         int cpu_index, device_declaration = 0;
549         static int cpu0_initialized;
550
551         pr = acpi_driver_data(device);
552         if (!pr)
553                 return -EINVAL;
554
555         if (num_online_cpus() > 1)
556                 errata.smp = TRUE;
557
558         acpi_processor_errata(pr);
559
560         /*
561          * Check to see if we have bus mastering arbitration control.  This
562          * is required for proper C3 usage (to maintain cache coherency).
563          */
564         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
565                 pr->flags.bm_control = 1;
566                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
567                                   "Bus mastering arbitration control present\n"));
568         } else
569                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
570                                   "No bus mastering arbitration control\n"));
571
572         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) {
573                 /*
574                  * Declared with "Device" statement; match _UID.
575                  * Note that we don't handle string _UIDs yet.
576                  */
577                 unsigned long long value;
578                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
579                                                 NULL, &value);
580                 if (ACPI_FAILURE(status)) {
581                         printk(KERN_ERR PREFIX
582                             "Evaluating processor _UID [%#x]\n", status);
583                         return -ENODEV;
584                 }
585                 device_declaration = 1;
586                 pr->acpi_id = value;
587         } else {
588                 /* Declared with "Processor" statement; match ProcessorID */
589                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
590                 if (ACPI_FAILURE(status)) {
591                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
592                         return -ENODEV;
593                 }
594
595                 /*
596                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
597                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
598                  *      arch/xxx/acpi.c
599                  */
600                 pr->acpi_id = object.processor.proc_id;
601         }
602         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
603
604         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
605         if (!cpu0_initialized && (cpu_index == -1) &&
606             (num_online_cpus() == 1)) {
607                 cpu_index = 0;
608         }
609
610         cpu0_initialized = 1;
611
612         pr->id = cpu_index;
613
614         /*
615          *  Extra Processor objects may be enumerated on MP systems with
616          *  less than the max # of CPUs. They should be ignored _iff
617          *  they are physically not present.
618          */
619         if (pr->id == -1) {
620                 if (ACPI_FAILURE
621                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
622                         return -ENODEV;
623                 }
624         }
625
626         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
627                           pr->acpi_id));
628
629         if (!object.processor.pblk_address)
630                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
631         else if (object.processor.pblk_length != 6)
632                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
633                             object.processor.pblk_length);
634         else {
635                 pr->throttling.address = object.processor.pblk_address;
636                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
637                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
638
639                 pr->pblk = object.processor.pblk_address;
640
641                 /*
642                  * We don't care about error returns - we just try to mark
643                  * these reserved so that nobody else is confused into thinking
644                  * that this region might be unused..
645                  *
646                  * (In particular, allocating the IO range for Cardbus)
647                  */
648                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
649         }
650
651         /*
652          * If ACPI describes a slot number for this CPU, we can use it
653          * ensure we get the right value in the "physical id" field
654          * of /proc/cpuinfo
655          */
656         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
657         if (ACPI_SUCCESS(status))
658                 arch_fix_phys_package_id(pr->id, object.integer.value);
659
660         return 0;
661 }
662
663 static DEFINE_PER_CPU(void *, processor_device_array);
664
665 static int __cpuinit acpi_processor_start(struct acpi_device *device)
666 {
667         int result = 0;
668         acpi_status status = AE_OK;
669         struct acpi_processor *pr;
670         struct sys_device *sysdev;
671
672         pr = acpi_driver_data(device);
673
674         result = acpi_processor_get_info(device);
675         if (result) {
676                 /* Processor is physically not present */
677                 return 0;
678         }
679
680         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
681
682         /*
683          * Buggy BIOS check
684          * ACPI id of processors can be reported wrongly by the BIOS.
685          * Don't trust it blindly
686          */
687         if (per_cpu(processor_device_array, pr->id) != NULL &&
688             per_cpu(processor_device_array, pr->id) != device) {
689                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
690                         "for the processor\n");
691                 return -ENODEV;
692         }
693         per_cpu(processor_device_array, pr->id) = device;
694
695         per_cpu(processors, pr->id) = pr;
696
697         result = acpi_processor_add_fs(device);
698         if (result)
699                 goto end;
700
701         sysdev = get_cpu_sysdev(pr->id);
702         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
703                 return -EFAULT;
704
705         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
706                                              acpi_processor_notify, pr);
707
708         /* _PDC call should be done before doing anything else (if reqd.). */
709         arch_acpi_processor_init_pdc(pr);
710         acpi_processor_set_pdc(pr);
711 #ifdef CONFIG_CPU_FREQ
712         acpi_processor_ppc_has_changed(pr);
713 #endif
714         acpi_processor_get_throttling_info(pr);
715         acpi_processor_get_limit_info(pr);
716
717
718         acpi_processor_power_init(pr, device);
719
720         pr->cdev = thermal_cooling_device_register("Processor", device,
721                                                 &processor_cooling_ops);
722         if (IS_ERR(pr->cdev)) {
723                 result = PTR_ERR(pr->cdev);
724                 goto end;
725         }
726
727         dev_info(&device->dev, "registered as cooling_device%d\n",
728                  pr->cdev->id);
729
730         result = sysfs_create_link(&device->dev.kobj,
731                                    &pr->cdev->device.kobj,
732                                    "thermal_cooling");
733         if (result)
734                 printk(KERN_ERR PREFIX "Create sysfs link\n");
735         result = sysfs_create_link(&pr->cdev->device.kobj,
736                                    &device->dev.kobj,
737                                    "device");
738         if (result)
739                 printk(KERN_ERR PREFIX "Create sysfs link\n");
740
741         if (pr->flags.throttling) {
742                 printk(KERN_INFO PREFIX "%s [%s] (supports",
743                        acpi_device_name(device), acpi_device_bid(device));
744                 printk(" %d throttling states", pr->throttling.state_count);
745                 printk(")\n");
746         }
747
748       end:
749
750         return result;
751 }
752
753 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
754 {
755         struct acpi_processor *pr = data;
756         struct acpi_device *device = NULL;
757         int saved;
758
759         if (!pr)
760                 return;
761
762         if (acpi_bus_get_device(pr->handle, &device))
763                 return;
764
765         switch (event) {
766         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
767                 saved = pr->performance_platform_limit;
768                 acpi_processor_ppc_has_changed(pr);
769                 if (saved == pr->performance_platform_limit)
770                         break;
771                 acpi_bus_generate_proc_event(device, event,
772                                         pr->performance_platform_limit);
773                 acpi_bus_generate_netlink_event(device->pnp.device_class,
774                                                   dev_name(&device->dev), event,
775                                                   pr->performance_platform_limit);
776                 break;
777         case ACPI_PROCESSOR_NOTIFY_POWER:
778                 acpi_processor_cst_has_changed(pr);
779                 acpi_bus_generate_proc_event(device, event, 0);
780                 acpi_bus_generate_netlink_event(device->pnp.device_class,
781                                                   dev_name(&device->dev), event, 0);
782                 break;
783         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
784                 acpi_processor_tstate_has_changed(pr);
785                 acpi_bus_generate_proc_event(device, event, 0);
786                 acpi_bus_generate_netlink_event(device->pnp.device_class,
787                                                   dev_name(&device->dev), event, 0);
788         default:
789                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
790                                   "Unsupported event [0x%x]\n", event));
791                 break;
792         }
793
794         return;
795 }
796
797 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
798                 unsigned long action, void *hcpu)
799 {
800         unsigned int cpu = (unsigned long)hcpu;
801         struct acpi_processor *pr = per_cpu(processors, cpu);
802
803         if (action == CPU_ONLINE && pr) {
804                 acpi_processor_ppc_has_changed(pr);
805                 acpi_processor_cst_has_changed(pr);
806                 acpi_processor_tstate_has_changed(pr);
807         }
808         return NOTIFY_OK;
809 }
810
811 static struct notifier_block acpi_cpu_notifier =
812 {
813             .notifier_call = acpi_cpu_soft_notify,
814 };
815
816 static int acpi_processor_add(struct acpi_device *device)
817 {
818         struct acpi_processor *pr = NULL;
819
820
821         if (!device)
822                 return -EINVAL;
823
824         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
825         if (!pr)
826                 return -ENOMEM;
827
828         if (!alloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
829                 kfree(pr);
830                 return -ENOMEM;
831         }
832
833         pr->handle = device->handle;
834         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
835         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
836         device->driver_data = pr;
837
838         return 0;
839 }
840
841 static int acpi_processor_remove(struct acpi_device *device, int type)
842 {
843         acpi_status status = AE_OK;
844         struct acpi_processor *pr = NULL;
845
846
847         if (!device || !acpi_driver_data(device))
848                 return -EINVAL;
849
850         pr = acpi_driver_data(device);
851
852         if (pr->id >= nr_cpu_ids)
853                 goto free;
854
855         if (type == ACPI_BUS_REMOVAL_EJECT) {
856                 if (acpi_processor_handle_eject(pr))
857                         return -EINVAL;
858         }
859
860         acpi_processor_power_exit(pr, device);
861
862         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
863                                             acpi_processor_notify);
864
865         sysfs_remove_link(&device->dev.kobj, "sysdev");
866
867         acpi_processor_remove_fs(device);
868
869         if (pr->cdev) {
870                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
871                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
872                 thermal_cooling_device_unregister(pr->cdev);
873                 pr->cdev = NULL;
874         }
875
876         per_cpu(processors, pr->id) = NULL;
877         per_cpu(processor_device_array, pr->id) = NULL;
878
879 free:
880         free_cpumask_var(pr->throttling.shared_cpu_map);
881         kfree(pr);
882
883         return 0;
884 }
885
886 #ifdef CONFIG_ACPI_HOTPLUG_CPU
887 /****************************************************************************
888  *      Acpi processor hotplug support                                      *
889  ****************************************************************************/
890
891 static int is_processor_present(acpi_handle handle)
892 {
893         acpi_status status;
894         unsigned long long sta = 0;
895
896
897         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
898
899         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
900                 return 1;
901
902         /*
903          * _STA is mandatory for a processor that supports hot plug
904          */
905         if (status == AE_NOT_FOUND)
906                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
907                                 "Processor does not support hot plug\n"));
908         else
909                 ACPI_EXCEPTION((AE_INFO, status,
910                                 "Processor Device is not present"));
911         return 0;
912 }
913
914 static
915 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
916 {
917         acpi_handle phandle;
918         struct acpi_device *pdev;
919         struct acpi_processor *pr;
920
921
922         if (acpi_get_parent(handle, &phandle)) {
923                 return -ENODEV;
924         }
925
926         if (acpi_bus_get_device(phandle, &pdev)) {
927                 return -ENODEV;
928         }
929
930         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
931                 return -ENODEV;
932         }
933
934         acpi_bus_start(*device);
935
936         pr = acpi_driver_data(*device);
937         if (!pr)
938                 return -ENODEV;
939
940         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
941                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
942         }
943         return 0;
944 }
945
946 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
947                                                 u32 event, void *data)
948 {
949         struct acpi_processor *pr;
950         struct acpi_device *device = NULL;
951         int result;
952
953
954         switch (event) {
955         case ACPI_NOTIFY_BUS_CHECK:
956         case ACPI_NOTIFY_DEVICE_CHECK:
957                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
958                 "Processor driver received %s event\n",
959                        (event == ACPI_NOTIFY_BUS_CHECK) ?
960                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
961
962                 if (!is_processor_present(handle))
963                         break;
964
965                 if (acpi_bus_get_device(handle, &device)) {
966                         result = acpi_processor_device_add(handle, &device);
967                         if (result)
968                                 printk(KERN_ERR PREFIX
969                                             "Unable to add the device\n");
970                         break;
971                 }
972
973                 pr = acpi_driver_data(device);
974                 if (!pr) {
975                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
976                         break;
977                 }
978
979                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
980                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
981                         break;
982                 }
983
984                 result = acpi_processor_start(device);
985                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
986                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
987                 } else {
988                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
989                                     acpi_device_bid(device));
990                 }
991                 break;
992         case ACPI_NOTIFY_EJECT_REQUEST:
993                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
994                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
995
996                 if (acpi_bus_get_device(handle, &device)) {
997                         printk(KERN_ERR PREFIX
998                                     "Device don't exist, dropping EJECT\n");
999                         break;
1000                 }
1001                 pr = acpi_driver_data(device);
1002                 if (!pr) {
1003                         printk(KERN_ERR PREFIX
1004                                     "Driver data is NULL, dropping EJECT\n");
1005                         return;
1006                 }
1007
1008                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
1009                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1010                 break;
1011         default:
1012                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1013                                   "Unsupported event [0x%x]\n", event));
1014                 break;
1015         }
1016
1017         return;
1018 }
1019
1020 static acpi_status
1021 processor_walk_namespace_cb(acpi_handle handle,
1022                             u32 lvl, void *context, void **rv)
1023 {
1024         acpi_status status;
1025         int *action = context;
1026         acpi_object_type type = 0;
1027
1028         status = acpi_get_type(handle, &type);
1029         if (ACPI_FAILURE(status))
1030                 return (AE_OK);
1031
1032         if (type != ACPI_TYPE_PROCESSOR)
1033                 return (AE_OK);
1034
1035         switch (*action) {
1036         case INSTALL_NOTIFY_HANDLER:
1037                 acpi_install_notify_handler(handle,
1038                                             ACPI_SYSTEM_NOTIFY,
1039                                             acpi_processor_hotplug_notify,
1040                                             NULL);
1041                 break;
1042         case UNINSTALL_NOTIFY_HANDLER:
1043                 acpi_remove_notify_handler(handle,
1044                                            ACPI_SYSTEM_NOTIFY,
1045                                            acpi_processor_hotplug_notify);
1046                 break;
1047         default:
1048                 break;
1049         }
1050
1051         return (AE_OK);
1052 }
1053
1054 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1055 {
1056
1057         if (!is_processor_present(handle)) {
1058                 return AE_ERROR;
1059         }
1060
1061         if (acpi_map_lsapic(handle, p_cpu))
1062                 return AE_ERROR;
1063
1064         if (arch_register_cpu(*p_cpu)) {
1065                 acpi_unmap_lsapic(*p_cpu);
1066                 return AE_ERROR;
1067         }
1068
1069         return AE_OK;
1070 }
1071
1072 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1073 {
1074         if (cpu_online(pr->id))
1075                 cpu_down(pr->id);
1076
1077         arch_unregister_cpu(pr->id);
1078         acpi_unmap_lsapic(pr->id);
1079         return (0);
1080 }
1081 #else
1082 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1083 {
1084         return AE_ERROR;
1085 }
1086 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1087 {
1088         return (-EINVAL);
1089 }
1090 #endif
1091
1092 static
1093 void acpi_processor_install_hotplug_notify(void)
1094 {
1095 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1096         int action = INSTALL_NOTIFY_HANDLER;
1097         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1098                             ACPI_ROOT_OBJECT,
1099                             ACPI_UINT32_MAX,
1100                             processor_walk_namespace_cb, &action, NULL);
1101 #endif
1102         register_hotcpu_notifier(&acpi_cpu_notifier);
1103 }
1104
1105 static
1106 void acpi_processor_uninstall_hotplug_notify(void)
1107 {
1108 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1109         int action = UNINSTALL_NOTIFY_HANDLER;
1110         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1111                             ACPI_ROOT_OBJECT,
1112                             ACPI_UINT32_MAX,
1113                             processor_walk_namespace_cb, &action, NULL);
1114 #endif
1115         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1116 }
1117
1118 /*
1119  * We keep the driver loaded even when ACPI is not running.
1120  * This is needed for the powernow-k8 driver, that works even without
1121  * ACPI, but needs symbols from this driver
1122  */
1123
1124 static int __init acpi_processor_init(void)
1125 {
1126         int result = 0;
1127
1128         memset(&errata, 0, sizeof(errata));
1129
1130 #ifdef CONFIG_SMP
1131         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1132                                 (struct acpi_table_header **)&madt)))
1133                 madt = NULL;
1134 #endif
1135
1136         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1137         if (!acpi_processor_dir)
1138                 return -ENOMEM;
1139
1140         /*
1141          * Check whether the system is DMI table. If yes, OSPM
1142          * should not use mwait for CPU-states.
1143          */
1144         dmi_check_system(processor_idle_dmi_table);
1145         result = cpuidle_register_driver(&acpi_idle_driver);
1146         if (result < 0)
1147                 goto out_proc;
1148
1149         result = acpi_bus_register_driver(&acpi_processor_driver);
1150         if (result < 0)
1151                 goto out_cpuidle;
1152
1153         acpi_processor_install_hotplug_notify();
1154
1155         acpi_thermal_cpufreq_init();
1156
1157         acpi_processor_ppc_init();
1158
1159         acpi_processor_throttling_init();
1160
1161         return 0;
1162
1163 out_cpuidle:
1164         cpuidle_unregister_driver(&acpi_idle_driver);
1165
1166 out_proc:
1167         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1168
1169         return result;
1170 }
1171
1172 static void __exit acpi_processor_exit(void)
1173 {
1174         acpi_processor_ppc_exit();
1175
1176         acpi_thermal_cpufreq_exit();
1177
1178         acpi_processor_uninstall_hotplug_notify();
1179
1180         acpi_bus_unregister_driver(&acpi_processor_driver);
1181
1182         cpuidle_unregister_driver(&acpi_idle_driver);
1183
1184         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1185
1186         return;
1187 }
1188
1189 module_init(acpi_processor_init);
1190 module_exit(acpi_processor_exit);
1191
1192 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1193
1194 MODULE_ALIAS("processor");