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