ACPI: processor: export acpi_get_cpuid()
[linux-3.10.git] / drivers / acpi / processor_driver.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_driver");
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 #ifdef CONFIG_SMP
365 static struct acpi_table_madt *madt;
366
367 static int map_lapic_id(struct acpi_subtable_header *entry,
368                  u32 acpi_id, int *apic_id)
369 {
370         struct acpi_madt_local_apic *lapic =
371                 (struct acpi_madt_local_apic *)entry;
372         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
373             lapic->processor_id == acpi_id) {
374                 *apic_id = lapic->id;
375                 return 1;
376         }
377         return 0;
378 }
379
380 static int map_x2apic_id(struct acpi_subtable_header *entry,
381                          int device_declaration, u32 acpi_id, int *apic_id)
382 {
383         struct acpi_madt_local_x2apic *apic =
384                 (struct acpi_madt_local_x2apic *)entry;
385         u32 tmp = apic->local_apic_id;
386
387         /* Only check enabled APICs*/
388         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
389                 return 0;
390
391         /* Device statement declaration type */
392         if (device_declaration) {
393                 if (apic->uid == acpi_id)
394                         goto found;
395         }
396
397         return 0;
398 found:
399         *apic_id = tmp;
400         return 1;
401 }
402
403 static int map_lsapic_id(struct acpi_subtable_header *entry,
404                 int device_declaration, u32 acpi_id, int *apic_id)
405 {
406         struct acpi_madt_local_sapic *lsapic =
407                 (struct acpi_madt_local_sapic *)entry;
408         u32 tmp = (lsapic->id << 8) | lsapic->eid;
409
410         /* Only check enabled APICs*/
411         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
412                 return 0;
413
414         /* Device statement declaration type */
415         if (device_declaration) {
416                 if (entry->length < 16)
417                         printk(KERN_ERR PREFIX
418                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
419                             tmp);
420                 else if (lsapic->uid == acpi_id)
421                         goto found;
422         /* Processor statement declaration type */
423         } else if (lsapic->processor_id == acpi_id)
424                 goto found;
425
426         return 0;
427 found:
428         *apic_id = tmp;
429         return 1;
430 }
431
432 static int map_madt_entry(int type, u32 acpi_id)
433 {
434         unsigned long madt_end, entry;
435         int apic_id = -1;
436
437         if (!madt)
438                 return apic_id;
439
440         entry = (unsigned long)madt;
441         madt_end = entry + madt->header.length;
442
443         /* Parse all entries looking for a match. */
444
445         entry += sizeof(struct acpi_table_madt);
446         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
447                 struct acpi_subtable_header *header =
448                         (struct acpi_subtable_header *)entry;
449                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
450                         if (map_lapic_id(header, acpi_id, &apic_id))
451                                 break;
452                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
453                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
454                                 break;
455                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
456                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
457                                 break;
458                 }
459                 entry += header->length;
460         }
461         return apic_id;
462 }
463
464 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
465 {
466         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
467         union acpi_object *obj;
468         struct acpi_subtable_header *header;
469         int apic_id = -1;
470
471         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
472                 goto exit;
473
474         if (!buffer.length || !buffer.pointer)
475                 goto exit;
476
477         obj = buffer.pointer;
478         if (obj->type != ACPI_TYPE_BUFFER ||
479             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
480                 goto exit;
481         }
482
483         header = (struct acpi_subtable_header *)obj->buffer.pointer;
484         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
485                 map_lapic_id(header, acpi_id, &apic_id);
486         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
487                 map_lsapic_id(header, type, acpi_id, &apic_id);
488         }
489
490 exit:
491         if (buffer.pointer)
492                 kfree(buffer.pointer);
493         return apic_id;
494 }
495
496 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
497 {
498         int i;
499         int apic_id = -1;
500
501         apic_id = map_mat_entry(handle, type, acpi_id);
502         if (apic_id == -1)
503                 apic_id = map_madt_entry(type, acpi_id);
504         if (apic_id == -1)
505                 return apic_id;
506
507         for_each_possible_cpu(i) {
508                 if (cpu_physical_id(i) == apic_id)
509                         return i;
510         }
511         return -1;
512 }
513 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
514 #endif
515
516 /* --------------------------------------------------------------------------
517                                  Driver Interface
518    -------------------------------------------------------------------------- */
519
520 static int acpi_processor_get_info(struct acpi_device *device)
521 {
522         acpi_status status = 0;
523         union acpi_object object = { 0 };
524         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
525         struct acpi_processor *pr;
526         int cpu_index, device_declaration = 0;
527         static int cpu0_initialized;
528
529         pr = acpi_driver_data(device);
530         if (!pr)
531                 return -EINVAL;
532
533         if (num_online_cpus() > 1)
534                 errata.smp = TRUE;
535
536         acpi_processor_errata(pr);
537
538         /*
539          * Check to see if we have bus mastering arbitration control.  This
540          * is required for proper C3 usage (to maintain cache coherency).
541          */
542         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
543                 pr->flags.bm_control = 1;
544                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
545                                   "Bus mastering arbitration control present\n"));
546         } else
547                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
548                                   "No bus mastering arbitration control\n"));
549
550         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
551                 /* Declared with "Processor" statement; match ProcessorID */
552                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
553                 if (ACPI_FAILURE(status)) {
554                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
555                         return -ENODEV;
556                 }
557
558                 /*
559                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
560                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
561                  *      arch/xxx/acpi.c
562                  */
563                 pr->acpi_id = object.processor.proc_id;
564         } else {
565                 /*
566                  * Declared with "Device" statement; match _UID.
567                  * Note that we don't handle string _UIDs yet.
568                  */
569                 unsigned long long value;
570                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
571                                                 NULL, &value);
572                 if (ACPI_FAILURE(status)) {
573                         printk(KERN_ERR PREFIX
574                             "Evaluating processor _UID [%#x]\n", status);
575                         return -ENODEV;
576                 }
577                 device_declaration = 1;
578                 pr->acpi_id = value;
579         }
580         cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
581
582         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
583         if (!cpu0_initialized && (cpu_index == -1) &&
584             (num_online_cpus() == 1)) {
585                 cpu_index = 0;
586         }
587
588         cpu0_initialized = 1;
589
590         pr->id = cpu_index;
591
592         /*
593          *  Extra Processor objects may be enumerated on MP systems with
594          *  less than the max # of CPUs. They should be ignored _iff
595          *  they are physically not present.
596          */
597         if (pr->id == -1) {
598                 if (ACPI_FAILURE
599                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
600                         return -ENODEV;
601                 }
602         }
603         /*
604          * On some boxes several processors use the same processor bus id.
605          * But they are located in different scope. For example:
606          * \_SB.SCK0.CPU0
607          * \_SB.SCK1.CPU0
608          * Rename the processor device bus id. And the new bus id will be
609          * generated as the following format:
610          * CPU+CPU ID.
611          */
612         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
613         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
614                           pr->acpi_id));
615
616         if (!object.processor.pblk_address)
617                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
618         else if (object.processor.pblk_length != 6)
619                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
620                             object.processor.pblk_length);
621         else {
622                 pr->throttling.address = object.processor.pblk_address;
623                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
624                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
625
626                 pr->pblk = object.processor.pblk_address;
627
628                 /*
629                  * We don't care about error returns - we just try to mark
630                  * these reserved so that nobody else is confused into thinking
631                  * that this region might be unused..
632                  *
633                  * (In particular, allocating the IO range for Cardbus)
634                  */
635                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
636         }
637
638         /*
639          * If ACPI describes a slot number for this CPU, we can use it
640          * ensure we get the right value in the "physical id" field
641          * of /proc/cpuinfo
642          */
643         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
644         if (ACPI_SUCCESS(status))
645                 arch_fix_phys_package_id(pr->id, object.integer.value);
646
647         return 0;
648 }
649
650 static DEFINE_PER_CPU(void *, processor_device_array);
651
652 static void acpi_processor_notify(struct acpi_device *device, u32 event)
653 {
654         struct acpi_processor *pr = acpi_driver_data(device);
655         int saved;
656
657         if (!pr)
658                 return;
659
660         switch (event) {
661         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
662                 saved = pr->performance_platform_limit;
663                 acpi_processor_ppc_has_changed(pr, 1);
664                 if (saved == pr->performance_platform_limit)
665                         break;
666                 acpi_bus_generate_proc_event(device, event,
667                                         pr->performance_platform_limit);
668                 acpi_bus_generate_netlink_event(device->pnp.device_class,
669                                                   dev_name(&device->dev), event,
670                                                   pr->performance_platform_limit);
671                 break;
672         case ACPI_PROCESSOR_NOTIFY_POWER:
673                 acpi_processor_cst_has_changed(pr);
674                 acpi_bus_generate_proc_event(device, event, 0);
675                 acpi_bus_generate_netlink_event(device->pnp.device_class,
676                                                   dev_name(&device->dev), event, 0);
677                 break;
678         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
679                 acpi_processor_tstate_has_changed(pr);
680                 acpi_bus_generate_proc_event(device, event, 0);
681                 acpi_bus_generate_netlink_event(device->pnp.device_class,
682                                                   dev_name(&device->dev), event, 0);
683         default:
684                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
685                                   "Unsupported event [0x%x]\n", event));
686                 break;
687         }
688
689         return;
690 }
691
692 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
693                 unsigned long action, void *hcpu)
694 {
695         unsigned int cpu = (unsigned long)hcpu;
696         struct acpi_processor *pr = per_cpu(processors, cpu);
697
698         if (action == CPU_ONLINE && pr) {
699                 acpi_processor_ppc_has_changed(pr, 0);
700                 acpi_processor_cst_has_changed(pr);
701                 acpi_processor_tstate_has_changed(pr);
702         }
703         return NOTIFY_OK;
704 }
705
706 static struct notifier_block acpi_cpu_notifier =
707 {
708             .notifier_call = acpi_cpu_soft_notify,
709 };
710
711 static int __cpuinit acpi_processor_add(struct acpi_device *device)
712 {
713         struct acpi_processor *pr = NULL;
714         int result = 0;
715         struct sys_device *sysdev;
716
717         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
718         if (!pr)
719                 return -ENOMEM;
720
721         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
722                 kfree(pr);
723                 return -ENOMEM;
724         }
725
726         pr->handle = device->handle;
727         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
728         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
729         device->driver_data = pr;
730
731         result = acpi_processor_get_info(device);
732         if (result) {
733                 /* Processor is physically not present */
734                 return 0;
735         }
736
737         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
738
739         /*
740          * Buggy BIOS check
741          * ACPI id of processors can be reported wrongly by the BIOS.
742          * Don't trust it blindly
743          */
744         if (per_cpu(processor_device_array, pr->id) != NULL &&
745             per_cpu(processor_device_array, pr->id) != device) {
746                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
747                         "for the processor\n");
748                 result = -ENODEV;
749                 goto err_free_cpumask;
750         }
751         per_cpu(processor_device_array, pr->id) = device;
752
753         per_cpu(processors, pr->id) = pr;
754
755         result = acpi_processor_add_fs(device);
756         if (result)
757                 goto err_free_cpumask;
758
759         sysdev = get_cpu_sysdev(pr->id);
760         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
761                 result = -EFAULT;
762                 goto err_remove_fs;
763         }
764
765         /* _PDC call should be done before doing anything else (if reqd.). */
766         acpi_processor_set_pdc(pr->handle);
767
768 #ifdef CONFIG_CPU_FREQ
769         acpi_processor_ppc_has_changed(pr, 0);
770 #endif
771         acpi_processor_get_throttling_info(pr);
772         acpi_processor_get_limit_info(pr);
773
774
775         acpi_processor_power_init(pr, device);
776
777         pr->cdev = thermal_cooling_device_register("Processor", device,
778                                                 &processor_cooling_ops);
779         if (IS_ERR(pr->cdev)) {
780                 result = PTR_ERR(pr->cdev);
781                 goto err_power_exit;
782         }
783
784         dev_dbg(&device->dev, "registered as cooling_device%d\n",
785                  pr->cdev->id);
786
787         result = sysfs_create_link(&device->dev.kobj,
788                                    &pr->cdev->device.kobj,
789                                    "thermal_cooling");
790         if (result) {
791                 printk(KERN_ERR PREFIX "Create sysfs link\n");
792                 goto err_thermal_unregister;
793         }
794         result = sysfs_create_link(&pr->cdev->device.kobj,
795                                    &device->dev.kobj,
796                                    "device");
797         if (result) {
798                 printk(KERN_ERR PREFIX "Create sysfs link\n");
799                 goto err_remove_sysfs;
800         }
801
802         return 0;
803
804 err_remove_sysfs:
805         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
806 err_thermal_unregister:
807         thermal_cooling_device_unregister(pr->cdev);
808 err_power_exit:
809         acpi_processor_power_exit(pr, device);
810 err_remove_fs:
811         acpi_processor_remove_fs(device);
812 err_free_cpumask:
813         free_cpumask_var(pr->throttling.shared_cpu_map);
814
815         return result;
816 }
817
818 static int acpi_processor_remove(struct acpi_device *device, int type)
819 {
820         struct acpi_processor *pr = NULL;
821
822
823         if (!device || !acpi_driver_data(device))
824                 return -EINVAL;
825
826         pr = acpi_driver_data(device);
827
828         if (pr->id >= nr_cpu_ids)
829                 goto free;
830
831         if (type == ACPI_BUS_REMOVAL_EJECT) {
832                 if (acpi_processor_handle_eject(pr))
833                         return -EINVAL;
834         }
835
836         acpi_processor_power_exit(pr, device);
837
838         sysfs_remove_link(&device->dev.kobj, "sysdev");
839
840         acpi_processor_remove_fs(device);
841
842         if (pr->cdev) {
843                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
844                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
845                 thermal_cooling_device_unregister(pr->cdev);
846                 pr->cdev = NULL;
847         }
848
849         per_cpu(processors, pr->id) = NULL;
850         per_cpu(processor_device_array, pr->id) = NULL;
851
852 free:
853         free_cpumask_var(pr->throttling.shared_cpu_map);
854         kfree(pr);
855
856         return 0;
857 }
858
859 #ifdef CONFIG_ACPI_HOTPLUG_CPU
860 /****************************************************************************
861  *      Acpi processor hotplug support                                      *
862  ****************************************************************************/
863
864 static int is_processor_present(acpi_handle handle)
865 {
866         acpi_status status;
867         unsigned long long sta = 0;
868
869
870         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
871
872         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
873                 return 1;
874
875         /*
876          * _STA is mandatory for a processor that supports hot plug
877          */
878         if (status == AE_NOT_FOUND)
879                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
880                                 "Processor does not support hot plug\n"));
881         else
882                 ACPI_EXCEPTION((AE_INFO, status,
883                                 "Processor Device is not present"));
884         return 0;
885 }
886
887 static
888 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
889 {
890         acpi_handle phandle;
891         struct acpi_device *pdev;
892
893
894         if (acpi_get_parent(handle, &phandle)) {
895                 return -ENODEV;
896         }
897
898         if (acpi_bus_get_device(phandle, &pdev)) {
899                 return -ENODEV;
900         }
901
902         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
903                 return -ENODEV;
904         }
905
906         return 0;
907 }
908
909 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
910                                                 u32 event, void *data)
911 {
912         struct acpi_processor *pr;
913         struct acpi_device *device = NULL;
914         int result;
915
916
917         switch (event) {
918         case ACPI_NOTIFY_BUS_CHECK:
919         case ACPI_NOTIFY_DEVICE_CHECK:
920                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
921                 "Processor driver received %s event\n",
922                        (event == ACPI_NOTIFY_BUS_CHECK) ?
923                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
924
925                 if (!is_processor_present(handle))
926                         break;
927
928                 if (acpi_bus_get_device(handle, &device)) {
929                         result = acpi_processor_device_add(handle, &device);
930                         if (result)
931                                 printk(KERN_ERR PREFIX
932                                             "Unable to add the device\n");
933                         break;
934                 }
935                 break;
936         case ACPI_NOTIFY_EJECT_REQUEST:
937                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
938                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
939
940                 if (acpi_bus_get_device(handle, &device)) {
941                         printk(KERN_ERR PREFIX
942                                     "Device don't exist, dropping EJECT\n");
943                         break;
944                 }
945                 pr = acpi_driver_data(device);
946                 if (!pr) {
947                         printk(KERN_ERR PREFIX
948                                     "Driver data is NULL, dropping EJECT\n");
949                         return;
950                 }
951                 break;
952         default:
953                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
954                                   "Unsupported event [0x%x]\n", event));
955                 break;
956         }
957
958         return;
959 }
960
961 static acpi_status
962 processor_walk_namespace_cb(acpi_handle handle,
963                             u32 lvl, void *context, void **rv)
964 {
965         acpi_status status;
966         int *action = context;
967         acpi_object_type type = 0;
968
969         status = acpi_get_type(handle, &type);
970         if (ACPI_FAILURE(status))
971                 return (AE_OK);
972
973         if (type != ACPI_TYPE_PROCESSOR)
974                 return (AE_OK);
975
976         switch (*action) {
977         case INSTALL_NOTIFY_HANDLER:
978                 acpi_install_notify_handler(handle,
979                                             ACPI_SYSTEM_NOTIFY,
980                                             acpi_processor_hotplug_notify,
981                                             NULL);
982                 break;
983         case UNINSTALL_NOTIFY_HANDLER:
984                 acpi_remove_notify_handler(handle,
985                                            ACPI_SYSTEM_NOTIFY,
986                                            acpi_processor_hotplug_notify);
987                 break;
988         default:
989                 break;
990         }
991
992         return (AE_OK);
993 }
994
995 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
996 {
997
998         if (!is_processor_present(handle)) {
999                 return AE_ERROR;
1000         }
1001
1002         if (acpi_map_lsapic(handle, p_cpu))
1003                 return AE_ERROR;
1004
1005         if (arch_register_cpu(*p_cpu)) {
1006                 acpi_unmap_lsapic(*p_cpu);
1007                 return AE_ERROR;
1008         }
1009
1010         return AE_OK;
1011 }
1012
1013 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1014 {
1015         if (cpu_online(pr->id))
1016                 cpu_down(pr->id);
1017
1018         arch_unregister_cpu(pr->id);
1019         acpi_unmap_lsapic(pr->id);
1020         return (0);
1021 }
1022 #else
1023 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1024 {
1025         return AE_ERROR;
1026 }
1027 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1028 {
1029         return (-EINVAL);
1030 }
1031 #endif
1032
1033 static
1034 void acpi_processor_install_hotplug_notify(void)
1035 {
1036 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1037         int action = INSTALL_NOTIFY_HANDLER;
1038         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1039                             ACPI_ROOT_OBJECT,
1040                             ACPI_UINT32_MAX,
1041                             processor_walk_namespace_cb, NULL, &action, NULL);
1042 #endif
1043         register_hotcpu_notifier(&acpi_cpu_notifier);
1044 }
1045
1046 static
1047 void acpi_processor_uninstall_hotplug_notify(void)
1048 {
1049 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1050         int action = UNINSTALL_NOTIFY_HANDLER;
1051         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1052                             ACPI_ROOT_OBJECT,
1053                             ACPI_UINT32_MAX,
1054                             processor_walk_namespace_cb, NULL, &action, NULL);
1055 #endif
1056         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1057 }
1058
1059 /*
1060  * We keep the driver loaded even when ACPI is not running.
1061  * This is needed for the powernow-k8 driver, that works even without
1062  * ACPI, but needs symbols from this driver
1063  */
1064
1065 static int __init acpi_processor_init(void)
1066 {
1067         int result = 0;
1068
1069         if (acpi_disabled)
1070                 return 0;
1071
1072         memset(&errata, 0, sizeof(errata));
1073
1074 #ifdef CONFIG_SMP
1075         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1076                                 (struct acpi_table_header **)&madt)))
1077                 madt = NULL;
1078 #endif
1079 #ifdef CONFIG_ACPI_PROCFS
1080         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1081         if (!acpi_processor_dir)
1082                 return -ENOMEM;
1083 #endif
1084         result = cpuidle_register_driver(&acpi_idle_driver);
1085         if (result < 0)
1086                 goto out_proc;
1087
1088         result = acpi_bus_register_driver(&acpi_processor_driver);
1089         if (result < 0)
1090                 goto out_cpuidle;
1091
1092         acpi_processor_install_hotplug_notify();
1093
1094         acpi_thermal_cpufreq_init();
1095
1096         acpi_processor_ppc_init();
1097
1098         acpi_processor_throttling_init();
1099
1100         return 0;
1101
1102 out_cpuidle:
1103         cpuidle_unregister_driver(&acpi_idle_driver);
1104
1105 out_proc:
1106 #ifdef CONFIG_ACPI_PROCFS
1107         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1108 #endif
1109
1110         return result;
1111 }
1112
1113 static void __exit acpi_processor_exit(void)
1114 {
1115         if (acpi_disabled)
1116                 return;
1117
1118         acpi_processor_ppc_exit();
1119
1120         acpi_thermal_cpufreq_exit();
1121
1122         acpi_processor_uninstall_hotplug_notify();
1123
1124         acpi_bus_unregister_driver(&acpi_processor_driver);
1125
1126         cpuidle_unregister_driver(&acpi_idle_driver);
1127
1128 #ifdef CONFIG_ACPI_PROCFS
1129         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1130 #endif
1131
1132         return;
1133 }
1134
1135 module_init(acpi_processor_init);
1136 module_exit(acpi_processor_exit);
1137
1138 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1139
1140 MODULE_ALIAS("processor");