a825b431b64f294df234e05e1244d56d6ce83bf3
[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 ACPI_PROCESSOR_COMPONENT        0x01000000
63 #define ACPI_PROCESSOR_CLASS            "processor"
64 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
65 #define ACPI_PROCESSOR_FILE_INFO        "info"
66 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
67 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
69 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
70 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
71
72 #define ACPI_PROCESSOR_LIMIT_USER       0
73 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
74
75 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
76 ACPI_MODULE_NAME("processor_core");
77
78 MODULE_AUTHOR("Paul Diefenbaugh");
79 MODULE_DESCRIPTION("ACPI Processor Driver");
80 MODULE_LICENSE("GPL");
81
82 static int acpi_processor_add(struct acpi_device *device);
83 static int acpi_processor_start(struct acpi_device *device);
84 static int acpi_processor_remove(struct acpi_device *device, int type);
85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
86 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
87 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
88 static int acpi_processor_handle_eject(struct acpi_processor *pr);
89 extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
90
91
92 static const struct acpi_device_id processor_device_ids[] = {
93         {ACPI_PROCESSOR_HID, 0},
94         {"", 0},
95 };
96 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
97
98 static struct acpi_driver acpi_processor_driver = {
99         .name = "processor",
100         .class = ACPI_PROCESSOR_CLASS,
101         .ids = processor_device_ids,
102         .ops = {
103                 .add = acpi_processor_add,
104                 .remove = acpi_processor_remove,
105                 .start = acpi_processor_start,
106                 .suspend = acpi_processor_suspend,
107                 .resume = acpi_processor_resume,
108                 },
109 };
110
111 #define INSTALL_NOTIFY_HANDLER          1
112 #define UNINSTALL_NOTIFY_HANDLER        2
113
114 static const struct file_operations acpi_processor_info_fops = {
115         .open = acpi_processor_info_open_fs,
116         .read = seq_read,
117         .llseek = seq_lseek,
118         .release = single_release,
119 };
120
121 struct acpi_processor *processors[NR_CPUS];
122 struct acpi_processor_errata errata __read_mostly;
123
124 /* --------------------------------------------------------------------------
125                                 Errata Handling
126    -------------------------------------------------------------------------- */
127
128 static int acpi_processor_errata_piix4(struct pci_dev *dev)
129 {
130         u8 value1 = 0;
131         u8 value2 = 0;
132
133
134         if (!dev)
135                 return -EINVAL;
136
137         /*
138          * Note that 'dev' references the PIIX4 ACPI Controller.
139          */
140
141         switch (dev->revision) {
142         case 0:
143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
144                 break;
145         case 1:
146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
147                 break;
148         case 2:
149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
150                 break;
151         case 3:
152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
153                 break;
154         default:
155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
156                 break;
157         }
158
159         switch (dev->revision) {
160
161         case 0:         /* PIIX4 A-step */
162         case 1:         /* PIIX4 B-step */
163                 /*
164                  * See specification changes #13 ("Manual Throttle Duty Cycle")
165                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
166                  * erratum #5 ("STPCLK# Deassertion Time") from the January
167                  * 2002 PIIX4 specification update.  Applies to only older
168                  * PIIX4 models.
169                  */
170                 errata.piix4.throttle = 1;
171
172         case 2:         /* PIIX4E */
173         case 3:         /* PIIX4M */
174                 /*
175                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
176                  * Livelock") from the January 2002 PIIX4 specification update.
177                  * Applies to all PIIX4 models.
178                  */
179
180                 /*
181                  * BM-IDE
182                  * ------
183                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
184                  * Status register address.  We'll use this later to read
185                  * each IDE controller's DMA status to make sure we catch all
186                  * DMA activity.
187                  */
188                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
189                                      PCI_DEVICE_ID_INTEL_82371AB,
190                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
191                 if (dev) {
192                         errata.piix4.bmisx = pci_resource_start(dev, 4);
193                         pci_dev_put(dev);
194                 }
195
196                 /*
197                  * Type-F DMA
198                  * ----------
199                  * Find the PIIX4 ISA Controller and read the Motherboard
200                  * DMA controller's status to see if Type-F (Fast) DMA mode
201                  * is enabled (bit 7) on either channel.  Note that we'll
202                  * disable C3 support if this is enabled, as some legacy
203                  * devices won't operate well if fast DMA is disabled.
204                  */
205                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
206                                      PCI_DEVICE_ID_INTEL_82371AB_0,
207                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
208                 if (dev) {
209                         pci_read_config_byte(dev, 0x76, &value1);
210                         pci_read_config_byte(dev, 0x77, &value2);
211                         if ((value1 & 0x80) || (value2 & 0x80))
212                                 errata.piix4.fdma = 1;
213                         pci_dev_put(dev);
214                 }
215
216                 break;
217         }
218
219         if (errata.piix4.bmisx)
220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
221                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
222         if (errata.piix4.fdma)
223                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
224                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
225
226         return 0;
227 }
228
229 static int acpi_processor_errata(struct acpi_processor *pr)
230 {
231         int result = 0;
232         struct pci_dev *dev = NULL;
233
234
235         if (!pr)
236                 return -EINVAL;
237
238         /*
239          * PIIX4
240          */
241         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
242                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
243                              PCI_ANY_ID, NULL);
244         if (dev) {
245                 result = acpi_processor_errata_piix4(dev);
246                 pci_dev_put(dev);
247         }
248
249         return result;
250 }
251
252 /* --------------------------------------------------------------------------
253                               Common ACPI processor functions
254    -------------------------------------------------------------------------- */
255
256 /*
257  * _PDC is required for a BIOS-OS handshake for most of the newer
258  * ACPI processor features.
259  */
260 static int acpi_processor_set_pdc(struct acpi_processor *pr)
261 {
262         struct acpi_object_list *pdc_in = pr->pdc;
263         acpi_status status = AE_OK;
264
265
266         if (!pdc_in)
267                 return status;
268
269         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
270
271         if (ACPI_FAILURE(status))
272                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
273                     "Could not evaluate _PDC, using legacy perf. control...\n"));
274
275         return status;
276 }
277
278 /* --------------------------------------------------------------------------
279                               FS Interface (/proc)
280    -------------------------------------------------------------------------- */
281
282 static struct proc_dir_entry *acpi_processor_dir = NULL;
283
284 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
285 {
286         struct acpi_processor *pr = seq->private;
287
288
289         if (!pr)
290                 goto end;
291
292         seq_printf(seq, "processor id:            %d\n"
293                    "acpi id:                 %d\n"
294                    "bus mastering control:   %s\n"
295                    "power management:        %s\n"
296                    "throttling control:      %s\n"
297                    "limit interface:         %s\n",
298                    pr->id,
299                    pr->acpi_id,
300                    pr->flags.bm_control ? "yes" : "no",
301                    pr->flags.power ? "yes" : "no",
302                    pr->flags.throttling ? "yes" : "no",
303                    pr->flags.limit ? "yes" : "no");
304
305       end:
306         return 0;
307 }
308
309 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
310 {
311         return single_open(file, acpi_processor_info_seq_show,
312                            PDE(inode)->data);
313 }
314
315 static int acpi_processor_add_fs(struct acpi_device *device)
316 {
317         struct proc_dir_entry *entry = NULL;
318
319
320         if (!acpi_device_dir(device)) {
321                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
322                                                      acpi_processor_dir);
323                 if (!acpi_device_dir(device))
324                         return -ENODEV;
325         }
326         acpi_device_dir(device)->owner = THIS_MODULE;
327
328         /* 'info' [R] */
329         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
330                                   S_IRUGO, acpi_device_dir(device));
331         if (!entry)
332                 return -EIO;
333         else {
334                 entry->proc_fops = &acpi_processor_info_fops;
335                 entry->data = acpi_driver_data(device);
336                 entry->owner = THIS_MODULE;
337         }
338
339         /* 'throttling' [R/W] */
340         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
341                                   S_IFREG | S_IRUGO | S_IWUSR,
342                                   acpi_device_dir(device));
343         if (!entry)
344                 return -EIO;
345         else {
346                 entry->proc_fops = &acpi_processor_throttling_fops;
347                 entry->data = acpi_driver_data(device);
348                 entry->owner = THIS_MODULE;
349         }
350
351         /* 'limit' [R/W] */
352         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
353                                   S_IFREG | S_IRUGO | S_IWUSR,
354                                   acpi_device_dir(device));
355         if (!entry)
356                 return -EIO;
357         else {
358                 entry->proc_fops = &acpi_processor_limit_fops;
359                 entry->data = acpi_driver_data(device);
360                 entry->owner = THIS_MODULE;
361         }
362
363         return 0;
364 }
365
366 static int acpi_processor_remove_fs(struct acpi_device *device)
367 {
368
369         if (acpi_device_dir(device)) {
370                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
371                                   acpi_device_dir(device));
372                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
373                                   acpi_device_dir(device));
374                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
375                                   acpi_device_dir(device));
376                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
377                 acpi_device_dir(device) = NULL;
378         }
379
380         return 0;
381 }
382
383 /* Use the acpiid in MADT to map cpus in case of SMP */
384
385 #ifndef CONFIG_SMP
386 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
387 #else
388
389 static struct acpi_table_madt *madt;
390
391 static int map_lapic_id(struct acpi_subtable_header *entry,
392                  u32 acpi_id, int *apic_id)
393 {
394         struct acpi_madt_local_apic *lapic =
395                 (struct acpi_madt_local_apic *)entry;
396         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
397             lapic->processor_id == acpi_id) {
398                 *apic_id = lapic->id;
399                 return 1;
400         }
401         return 0;
402 }
403
404 static int map_lsapic_id(struct acpi_subtable_header *entry,
405                   u32 acpi_id, int *apic_id)
406 {
407         struct acpi_madt_local_sapic *lsapic =
408                 (struct acpi_madt_local_sapic *)entry;
409         /* Only check enabled APICs*/
410         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
411                 /* First check against id */
412                 if (lsapic->processor_id == acpi_id) {
413                         *apic_id = (lsapic->id << 8) | lsapic->eid;
414                         return 1;
415                 /* Check against optional uid */
416                 } else if (entry->length >= 16 &&
417                         lsapic->uid == acpi_id) {
418                         *apic_id = lsapic->uid;
419                         return 1;
420                 }
421         }
422         return 0;
423 }
424
425 static int map_madt_entry(u32 acpi_id)
426 {
427         unsigned long madt_end, entry;
428         int apic_id = -1;
429
430         if (!madt)
431                 return apic_id;
432
433         entry = (unsigned long)madt;
434         madt_end = entry + madt->header.length;
435
436         /* Parse all entries looking for a match. */
437
438         entry += sizeof(struct acpi_table_madt);
439         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
440                 struct acpi_subtable_header *header =
441                         (struct acpi_subtable_header *)entry;
442                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
443                         if (map_lapic_id(header, acpi_id, &apic_id))
444                                 break;
445                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
446                         if (map_lsapic_id(header, acpi_id, &apic_id))
447                                 break;
448                 }
449                 entry += header->length;
450         }
451         return apic_id;
452 }
453
454 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
455 {
456         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
457         union acpi_object *obj;
458         struct acpi_subtable_header *header;
459         int apic_id = -1;
460
461         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
462                 goto exit;
463
464         if (!buffer.length || !buffer.pointer)
465                 goto exit;
466
467         obj = buffer.pointer;
468         if (obj->type != ACPI_TYPE_BUFFER ||
469             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
470                 goto exit;
471         }
472
473         header = (struct acpi_subtable_header *)obj->buffer.pointer;
474         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
475                 map_lapic_id(header, acpi_id, &apic_id);
476         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
477                 map_lsapic_id(header, acpi_id, &apic_id);
478         }
479
480 exit:
481         if (buffer.pointer)
482                 kfree(buffer.pointer);
483         return apic_id;
484 }
485
486 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
487 {
488         int i;
489         int apic_id = -1;
490
491         apic_id = map_mat_entry(handle, acpi_id);
492         if (apic_id == -1)
493                 apic_id = map_madt_entry(acpi_id);
494         if (apic_id == -1)
495                 return apic_id;
496
497         for_each_possible_cpu(i) {
498                 if (cpu_physical_id(i) == apic_id)
499                         return i;
500         }
501         return -1;
502 }
503 #endif
504
505 /* --------------------------------------------------------------------------
506                                  Driver Interface
507    -------------------------------------------------------------------------- */
508
509 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
510 {
511         acpi_status status = 0;
512         union acpi_object object = { 0 };
513         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
514         int cpu_index;
515         static int cpu0_initialized;
516
517
518         if (!pr)
519                 return -EINVAL;
520
521         if (num_online_cpus() > 1)
522                 errata.smp = TRUE;
523
524         acpi_processor_errata(pr);
525
526         /*
527          * Check to see if we have bus mastering arbitration control.  This
528          * is required for proper C3 usage (to maintain cache coherency).
529          */
530         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
531                 pr->flags.bm_control = 1;
532                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
533                                   "Bus mastering arbitration control present\n"));
534         } else
535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
536                                   "No bus mastering arbitration control\n"));
537
538         /* Check if it is a Device with HID and UID */
539         if (has_uid) {
540                 unsigned long value;
541                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
542                                                 NULL, &value);
543                 if (ACPI_FAILURE(status)) {
544                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
545                         return -ENODEV;
546                 }
547                 pr->acpi_id = value;
548         } else {
549                 /*
550                 * Evalute the processor object.  Note that it is common on SMP to
551                 * have the first (boot) processor with a valid PBLK address while
552                 * all others have a NULL address.
553                 */
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 arch/xxx/acpi.c
563                 */
564                 pr->acpi_id = object.processor.proc_id;
565         }
566         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
567
568         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
569         if (!cpu0_initialized && (cpu_index == -1) &&
570             (num_online_cpus() == 1)) {
571                 cpu_index = 0;
572         }
573
574         cpu0_initialized = 1;
575
576         pr->id = cpu_index;
577
578         /*
579          *  Extra Processor objects may be enumerated on MP systems with
580          *  less than the max # of CPUs. They should be ignored _iff
581          *  they are physically not present.
582          */
583         if (pr->id == -1) {
584                 if (ACPI_FAILURE
585                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
586                         return -ENODEV;
587                 }
588         }
589
590         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
591                           pr->acpi_id));
592
593         if (!object.processor.pblk_address)
594                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
595         else if (object.processor.pblk_length != 6)
596                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
597                             object.processor.pblk_length);
598         else {
599                 pr->throttling.address = object.processor.pblk_address;
600                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
601                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
602
603                 pr->pblk = object.processor.pblk_address;
604
605                 /*
606                  * We don't care about error returns - we just try to mark
607                  * these reserved so that nobody else is confused into thinking
608                  * that this region might be unused..
609                  *
610                  * (In particular, allocating the IO range for Cardbus)
611                  */
612                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
613         }
614
615         return 0;
616 }
617
618 static void *processor_device_array[NR_CPUS];
619
620 static int __cpuinit acpi_processor_start(struct acpi_device *device)
621 {
622         int result = 0;
623         acpi_status status = AE_OK;
624         struct acpi_processor *pr;
625
626
627         pr = acpi_driver_data(device);
628
629         result = acpi_processor_get_info(pr, device->flags.unique_id);
630         if (result) {
631                 /* Processor is physically not present */
632                 return 0;
633         }
634
635         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
636
637         /*
638          * Buggy BIOS check
639          * ACPI id of processors can be reported wrongly by the BIOS.
640          * Don't trust it blindly
641          */
642         if (processor_device_array[pr->id] != NULL &&
643             processor_device_array[pr->id] != device) {
644                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
645                         "for the processor\n");
646                 return -ENODEV;
647         }
648         processor_device_array[pr->id] = device;
649
650         processors[pr->id] = pr;
651
652         result = acpi_processor_add_fs(device);
653         if (result)
654                 goto end;
655
656         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
657                                              acpi_processor_notify, pr);
658
659         /* _PDC call should be done before doing anything else (if reqd.). */
660         arch_acpi_processor_init_pdc(pr);
661         acpi_processor_set_pdc(pr);
662 #ifdef CONFIG_CPU_FREQ
663         acpi_processor_ppc_has_changed(pr);
664 #endif
665         acpi_processor_get_throttling_info(pr);
666         acpi_processor_get_limit_info(pr);
667
668
669         acpi_processor_power_init(pr, device);
670
671         pr->cdev = thermal_cooling_device_register("Processor", device,
672                                                 &processor_cooling_ops);
673         if (IS_ERR(pr->cdev)) {
674                 result = PTR_ERR(pr->cdev);
675                 goto end;
676         }
677         if (pr->cdev) {
678                 printk(KERN_INFO PREFIX
679                         "%s is registered as cooling_device%d\n",
680                         device->dev.bus_id, pr->cdev->id);
681
682                 result = sysfs_create_link(&device->dev.kobj,
683                                            &pr->cdev->device.kobj,
684                                            "thermal_cooling");
685                 if (result)
686                         return result;
687                 result = sysfs_create_link(&pr->cdev->device.kobj,
688                                            &device->dev.kobj,
689                                            "device");
690                 if (result)
691                         return result;
692         }
693
694         if (pr->flags.throttling) {
695                 printk(KERN_INFO PREFIX "%s [%s] (supports",
696                        acpi_device_name(device), acpi_device_bid(device));
697                 printk(" %d throttling states", pr->throttling.state_count);
698                 printk(")\n");
699         }
700
701       end:
702
703         return result;
704 }
705
706 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
707 {
708         struct acpi_processor *pr = data;
709         struct acpi_device *device = NULL;
710         int saved;
711
712         if (!pr)
713                 return;
714
715         if (acpi_bus_get_device(pr->handle, &device))
716                 return;
717
718         switch (event) {
719         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
720                 saved = pr->performance_platform_limit;
721                 acpi_processor_ppc_has_changed(pr);
722                 if (saved == pr->performance_platform_limit)
723                         break;
724                 acpi_bus_generate_proc_event(device, event,
725                                         pr->performance_platform_limit);
726                 acpi_bus_generate_netlink_event(device->pnp.device_class,
727                                                   device->dev.bus_id, event,
728                                                   pr->performance_platform_limit);
729                 break;
730         case ACPI_PROCESSOR_NOTIFY_POWER:
731                 acpi_processor_cst_has_changed(pr);
732                 acpi_bus_generate_proc_event(device, event, 0);
733                 acpi_bus_generate_netlink_event(device->pnp.device_class,
734                                                   device->dev.bus_id, event, 0);
735                 break;
736         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
737                 acpi_processor_tstate_has_changed(pr);
738                 acpi_bus_generate_proc_event(device, event, 0);
739                 acpi_bus_generate_netlink_event(device->pnp.device_class,
740                                                   device->dev.bus_id, event, 0);
741         default:
742                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
743                                   "Unsupported event [0x%x]\n", event));
744                 break;
745         }
746
747         return;
748 }
749
750 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
751                 unsigned long action, void *hcpu)
752 {
753         unsigned int cpu = (unsigned long)hcpu;
754         struct acpi_processor *pr = processors[cpu];
755
756         if (action == CPU_ONLINE && pr) {
757                 acpi_processor_ppc_has_changed(pr);
758                 acpi_processor_cst_has_changed(pr);
759                 acpi_processor_tstate_has_changed(pr);
760         }
761         return NOTIFY_OK;
762 }
763
764 static struct notifier_block acpi_cpu_notifier =
765 {
766             .notifier_call = acpi_cpu_soft_notify,
767 };
768
769 static int acpi_processor_add(struct acpi_device *device)
770 {
771         struct acpi_processor *pr = NULL;
772
773
774         if (!device)
775                 return -EINVAL;
776
777         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
778         if (!pr)
779                 return -ENOMEM;
780
781         pr->handle = device->handle;
782         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
783         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
784         acpi_driver_data(device) = pr;
785
786         return 0;
787 }
788
789 static int acpi_processor_remove(struct acpi_device *device, int type)
790 {
791         acpi_status status = AE_OK;
792         struct acpi_processor *pr = NULL;
793
794
795         if (!device || !acpi_driver_data(device))
796                 return -EINVAL;
797
798         pr = acpi_driver_data(device);
799
800         if (pr->id >= nr_cpu_ids) {
801                 kfree(pr);
802                 return 0;
803         }
804
805         if (type == ACPI_BUS_REMOVAL_EJECT) {
806                 if (acpi_processor_handle_eject(pr))
807                         return -EINVAL;
808         }
809
810         acpi_processor_power_exit(pr, device);
811
812         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
813                                             acpi_processor_notify);
814
815         acpi_processor_remove_fs(device);
816
817         if (pr->cdev) {
818                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
819                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
820                 thermal_cooling_device_unregister(pr->cdev);
821                 pr->cdev = NULL;
822         }
823
824         processors[pr->id] = NULL;
825         processor_device_array[pr->id] = NULL;
826         kfree(pr);
827
828         return 0;
829 }
830
831 #ifdef CONFIG_ACPI_HOTPLUG_CPU
832 /****************************************************************************
833  *      Acpi processor hotplug support                                      *
834  ****************************************************************************/
835
836 static int is_processor_present(acpi_handle handle)
837 {
838         acpi_status status;
839         unsigned long sta = 0;
840
841
842         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
843
844         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
845                 return 1;
846
847         /*
848          * _STA is mandatory for a processor that supports hot plug
849          */
850         if (status == AE_NOT_FOUND)
851                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
852                                 "Processor does not support hot plug\n"));
853         else
854                 ACPI_EXCEPTION((AE_INFO, status,
855                                 "Processor Device is not present"));
856         return 0;
857 }
858
859 static
860 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
861 {
862         acpi_handle phandle;
863         struct acpi_device *pdev;
864         struct acpi_processor *pr;
865
866
867         if (acpi_get_parent(handle, &phandle)) {
868                 return -ENODEV;
869         }
870
871         if (acpi_bus_get_device(phandle, &pdev)) {
872                 return -ENODEV;
873         }
874
875         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
876                 return -ENODEV;
877         }
878
879         acpi_bus_start(*device);
880
881         pr = acpi_driver_data(*device);
882         if (!pr)
883                 return -ENODEV;
884
885         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
886                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
887         }
888         return 0;
889 }
890
891 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
892                                                 u32 event, void *data)
893 {
894         struct acpi_processor *pr;
895         struct acpi_device *device = NULL;
896         int result;
897
898
899         switch (event) {
900         case ACPI_NOTIFY_BUS_CHECK:
901         case ACPI_NOTIFY_DEVICE_CHECK:
902                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
903                 "Processor driver received %s event\n",
904                        (event == ACPI_NOTIFY_BUS_CHECK) ?
905                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
906
907                 if (!is_processor_present(handle))
908                         break;
909
910                 if (acpi_bus_get_device(handle, &device)) {
911                         result = acpi_processor_device_add(handle, &device);
912                         if (result)
913                                 printk(KERN_ERR PREFIX
914                                             "Unable to add the device\n");
915                         break;
916                 }
917
918                 pr = acpi_driver_data(device);
919                 if (!pr) {
920                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
921                         break;
922                 }
923
924                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
925                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
926                         break;
927                 }
928
929                 result = acpi_processor_start(device);
930                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
931                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
932                 } else {
933                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
934                                     acpi_device_bid(device));
935                 }
936                 break;
937         case ACPI_NOTIFY_EJECT_REQUEST:
938                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
939                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
940
941                 if (acpi_bus_get_device(handle, &device)) {
942                         printk(KERN_ERR PREFIX
943                                     "Device don't exist, dropping EJECT\n");
944                         break;
945                 }
946                 pr = acpi_driver_data(device);
947                 if (!pr) {
948                         printk(KERN_ERR PREFIX
949                                     "Driver data is NULL, dropping EJECT\n");
950                         return;
951                 }
952
953                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
954                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
955                 break;
956         default:
957                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
958                                   "Unsupported event [0x%x]\n", event));
959                 break;
960         }
961
962         return;
963 }
964
965 static acpi_status
966 processor_walk_namespace_cb(acpi_handle handle,
967                             u32 lvl, void *context, void **rv)
968 {
969         acpi_status status;
970         int *action = context;
971         acpi_object_type type = 0;
972
973         status = acpi_get_type(handle, &type);
974         if (ACPI_FAILURE(status))
975                 return (AE_OK);
976
977         if (type != ACPI_TYPE_PROCESSOR)
978                 return (AE_OK);
979
980         switch (*action) {
981         case INSTALL_NOTIFY_HANDLER:
982                 acpi_install_notify_handler(handle,
983                                             ACPI_SYSTEM_NOTIFY,
984                                             acpi_processor_hotplug_notify,
985                                             NULL);
986                 break;
987         case UNINSTALL_NOTIFY_HANDLER:
988                 acpi_remove_notify_handler(handle,
989                                            ACPI_SYSTEM_NOTIFY,
990                                            acpi_processor_hotplug_notify);
991                 break;
992         default:
993                 break;
994         }
995
996         return (AE_OK);
997 }
998
999 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1000 {
1001
1002         if (!is_processor_present(handle)) {
1003                 return AE_ERROR;
1004         }
1005
1006         if (acpi_map_lsapic(handle, p_cpu))
1007                 return AE_ERROR;
1008
1009         if (arch_register_cpu(*p_cpu)) {
1010                 acpi_unmap_lsapic(*p_cpu);
1011                 return AE_ERROR;
1012         }
1013
1014         return AE_OK;
1015 }
1016
1017 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1018 {
1019         if (cpu_online(pr->id)) {
1020                 return (-EINVAL);
1021         }
1022         arch_unregister_cpu(pr->id);
1023         acpi_unmap_lsapic(pr->id);
1024         return (0);
1025 }
1026 #else
1027 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1028 {
1029         return AE_ERROR;
1030 }
1031 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1032 {
1033         return (-EINVAL);
1034 }
1035 #endif
1036
1037 static
1038 void acpi_processor_install_hotplug_notify(void)
1039 {
1040 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1041         int action = INSTALL_NOTIFY_HANDLER;
1042         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1043                             ACPI_ROOT_OBJECT,
1044                             ACPI_UINT32_MAX,
1045                             processor_walk_namespace_cb, &action, NULL);
1046 #endif
1047         register_hotcpu_notifier(&acpi_cpu_notifier);
1048 }
1049
1050 static
1051 void acpi_processor_uninstall_hotplug_notify(void)
1052 {
1053 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1054         int action = UNINSTALL_NOTIFY_HANDLER;
1055         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1056                             ACPI_ROOT_OBJECT,
1057                             ACPI_UINT32_MAX,
1058                             processor_walk_namespace_cb, &action, NULL);
1059 #endif
1060         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1061 }
1062
1063 /*
1064  * We keep the driver loaded even when ACPI is not running.
1065  * This is needed for the powernow-k8 driver, that works even without
1066  * ACPI, but needs symbols from this driver
1067  */
1068
1069 static int __init acpi_processor_init(void)
1070 {
1071         int result = 0;
1072
1073
1074         memset(&processors, 0, sizeof(processors));
1075         memset(&errata, 0, sizeof(errata));
1076
1077 #ifdef CONFIG_SMP
1078         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1079                                 (struct acpi_table_header **)&madt)))
1080                 madt = NULL;
1081 #endif
1082
1083         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1084         if (!acpi_processor_dir)
1085                 return -ENOMEM;
1086         acpi_processor_dir->owner = THIS_MODULE;
1087
1088         result = cpuidle_register_driver(&acpi_idle_driver);
1089         if (result < 0)
1090                 goto out_proc;
1091
1092         result = acpi_bus_register_driver(&acpi_processor_driver);
1093         if (result < 0)
1094                 goto out_cpuidle;
1095
1096         acpi_processor_install_hotplug_notify();
1097
1098         acpi_thermal_cpufreq_init();
1099
1100         acpi_processor_ppc_init();
1101
1102         acpi_processor_throttling_init();
1103
1104         return 0;
1105
1106 out_cpuidle:
1107         cpuidle_unregister_driver(&acpi_idle_driver);
1108
1109 out_proc:
1110         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1111
1112         return result;
1113 }
1114
1115 static void __exit acpi_processor_exit(void)
1116 {
1117         acpi_processor_ppc_exit();
1118
1119         acpi_thermal_cpufreq_exit();
1120
1121         acpi_processor_uninstall_hotplug_notify();
1122
1123         acpi_bus_unregister_driver(&acpi_processor_driver);
1124
1125         cpuidle_unregister_driver(&acpi_idle_driver);
1126
1127         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1128
1129         return;
1130 }
1131
1132 module_init(acpi_processor_init);
1133 module_exit(acpi_processor_exit);
1134
1135 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1136
1137 MODULE_ALIAS("processor");