81aceb5da7c7948f905787fd040c5b9f7f810c1b
[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
48 #include <asm/io.h>
49 #include <asm/system.h>
50 #include <asm/cpu.h>
51 #include <asm/delay.h>
52 #include <asm/uaccess.h>
53 #include <asm/processor.h>
54 #include <asm/smp.h>
55 #include <asm/acpi.h>
56
57 #include <acpi/acpi_bus.h>
58 #include <acpi/acpi_drivers.h>
59 #include <acpi/processor.h>
60
61 #define ACPI_PROCESSOR_COMPONENT        0x01000000
62 #define ACPI_PROCESSOR_CLASS            "processor"
63 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
64 #define ACPI_PROCESSOR_FILE_INFO        "info"
65 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
66 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
68 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
69 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
70
71 #define ACPI_PROCESSOR_LIMIT_USER       0
72 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
73
74 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
75 ACPI_MODULE_NAME("processor_core");
76
77 MODULE_AUTHOR("Paul Diefenbaugh");
78 MODULE_DESCRIPTION("ACPI Processor Driver");
79 MODULE_LICENSE("GPL");
80
81 static int acpi_processor_add(struct acpi_device *device);
82 static int acpi_processor_start(struct acpi_device *device);
83 static int acpi_processor_remove(struct acpi_device *device, int type);
84 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
85 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
86 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
87 static int acpi_processor_handle_eject(struct acpi_processor *pr);
88 extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
89
90
91 static struct acpi_driver acpi_processor_driver = {
92         .name = "processor",
93         .class = ACPI_PROCESSOR_CLASS,
94         .ids = ACPI_PROCESSOR_HID,
95         .ops = {
96                 .add = acpi_processor_add,
97                 .remove = acpi_processor_remove,
98                 .start = acpi_processor_start,
99                 },
100 };
101
102 #define INSTALL_NOTIFY_HANDLER          1
103 #define UNINSTALL_NOTIFY_HANDLER        2
104
105 static const struct file_operations acpi_processor_info_fops = {
106         .open = acpi_processor_info_open_fs,
107         .read = seq_read,
108         .llseek = seq_lseek,
109         .release = single_release,
110 };
111
112 struct acpi_processor *processors[NR_CPUS];
113 struct acpi_processor_errata errata __read_mostly;
114
115 /* --------------------------------------------------------------------------
116                                 Errata Handling
117    -------------------------------------------------------------------------- */
118
119 static int acpi_processor_errata_piix4(struct pci_dev *dev)
120 {
121         u8 value1 = 0;
122         u8 value2 = 0;
123
124
125         if (!dev)
126                 return -EINVAL;
127
128         /*
129          * Note that 'dev' references the PIIX4 ACPI Controller.
130          */
131
132         switch (dev->revision) {
133         case 0:
134                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
135                 break;
136         case 1:
137                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
138                 break;
139         case 2:
140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
141                 break;
142         case 3:
143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
144                 break;
145         default:
146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
147                 break;
148         }
149
150         switch (dev->revision) {
151
152         case 0:         /* PIIX4 A-step */
153         case 1:         /* PIIX4 B-step */
154                 /*
155                  * See specification changes #13 ("Manual Throttle Duty Cycle")
156                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
157                  * erratum #5 ("STPCLK# Deassertion Time") from the January
158                  * 2002 PIIX4 specification update.  Applies to only older
159                  * PIIX4 models.
160                  */
161                 errata.piix4.throttle = 1;
162
163         case 2:         /* PIIX4E */
164         case 3:         /* PIIX4M */
165                 /*
166                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
167                  * Livelock") from the January 2002 PIIX4 specification update.
168                  * Applies to all PIIX4 models.
169                  */
170
171                 /*
172                  * BM-IDE
173                  * ------
174                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
175                  * Status register address.  We'll use this later to read
176                  * each IDE controller's DMA status to make sure we catch all
177                  * DMA activity.
178                  */
179                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
180                                      PCI_DEVICE_ID_INTEL_82371AB,
181                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
182                 if (dev) {
183                         errata.piix4.bmisx = pci_resource_start(dev, 4);
184                         pci_dev_put(dev);
185                 }
186
187                 /*
188                  * Type-F DMA
189                  * ----------
190                  * Find the PIIX4 ISA Controller and read the Motherboard
191                  * DMA controller's status to see if Type-F (Fast) DMA mode
192                  * is enabled (bit 7) on either channel.  Note that we'll
193                  * disable C3 support if this is enabled, as some legacy
194                  * devices won't operate well if fast DMA is disabled.
195                  */
196                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
197                                      PCI_DEVICE_ID_INTEL_82371AB_0,
198                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
199                 if (dev) {
200                         pci_read_config_byte(dev, 0x76, &value1);
201                         pci_read_config_byte(dev, 0x77, &value2);
202                         if ((value1 & 0x80) || (value2 & 0x80))
203                                 errata.piix4.fdma = 1;
204                         pci_dev_put(dev);
205                 }
206
207                 break;
208         }
209
210         if (errata.piix4.bmisx)
211                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
212                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
213         if (errata.piix4.fdma)
214                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
215                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
216
217         return 0;
218 }
219
220 static int acpi_processor_errata(struct acpi_processor *pr)
221 {
222         int result = 0;
223         struct pci_dev *dev = NULL;
224
225
226         if (!pr)
227                 return -EINVAL;
228
229         /*
230          * PIIX4
231          */
232         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
233                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
234                              PCI_ANY_ID, NULL);
235         if (dev) {
236                 result = acpi_processor_errata_piix4(dev);
237                 pci_dev_put(dev);
238         }
239
240         return result;
241 }
242
243 /* --------------------------------------------------------------------------
244                               Common ACPI processor functions
245    -------------------------------------------------------------------------- */
246
247 /*
248  * _PDC is required for a BIOS-OS handshake for most of the newer
249  * ACPI processor features.
250  */
251 static int acpi_processor_set_pdc(struct acpi_processor *pr)
252 {
253         struct acpi_object_list *pdc_in = pr->pdc;
254         acpi_status status = AE_OK;
255
256
257         if (!pdc_in)
258                 return status;
259
260         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
261
262         if (ACPI_FAILURE(status))
263                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
264                     "Could not evaluate _PDC, using legacy perf. control...\n"));
265
266         return status;
267 }
268
269 /* --------------------------------------------------------------------------
270                               FS Interface (/proc)
271    -------------------------------------------------------------------------- */
272
273 static struct proc_dir_entry *acpi_processor_dir = NULL;
274
275 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
276 {
277         struct acpi_processor *pr = seq->private;
278
279
280         if (!pr)
281                 goto end;
282
283         seq_printf(seq, "processor id:            %d\n"
284                    "acpi id:                 %d\n"
285                    "bus mastering control:   %s\n"
286                    "power management:        %s\n"
287                    "throttling control:      %s\n"
288                    "limit interface:         %s\n",
289                    pr->id,
290                    pr->acpi_id,
291                    pr->flags.bm_control ? "yes" : "no",
292                    pr->flags.power ? "yes" : "no",
293                    pr->flags.throttling ? "yes" : "no",
294                    pr->flags.limit ? "yes" : "no");
295
296       end:
297         return 0;
298 }
299
300 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
301 {
302         return single_open(file, acpi_processor_info_seq_show,
303                            PDE(inode)->data);
304 }
305
306 static int acpi_processor_add_fs(struct acpi_device *device)
307 {
308         struct proc_dir_entry *entry = NULL;
309
310
311         if (!acpi_device_dir(device)) {
312                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
313                                                      acpi_processor_dir);
314                 if (!acpi_device_dir(device))
315                         return -ENODEV;
316         }
317         acpi_device_dir(device)->owner = THIS_MODULE;
318
319         /* 'info' [R] */
320         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
321                                   S_IRUGO, acpi_device_dir(device));
322         if (!entry)
323                 return -EIO;
324         else {
325                 entry->proc_fops = &acpi_processor_info_fops;
326                 entry->data = acpi_driver_data(device);
327                 entry->owner = THIS_MODULE;
328         }
329
330         /* 'throttling' [R/W] */
331         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
332                                   S_IFREG | S_IRUGO | S_IWUSR,
333                                   acpi_device_dir(device));
334         if (!entry)
335                 return -EIO;
336         else {
337                 entry->proc_fops = &acpi_processor_throttling_fops;
338                 entry->data = acpi_driver_data(device);
339                 entry->owner = THIS_MODULE;
340         }
341
342         /* 'limit' [R/W] */
343         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
344                                   S_IFREG | S_IRUGO | S_IWUSR,
345                                   acpi_device_dir(device));
346         if (!entry)
347                 return -EIO;
348         else {
349                 entry->proc_fops = &acpi_processor_limit_fops;
350                 entry->data = acpi_driver_data(device);
351                 entry->owner = THIS_MODULE;
352         }
353
354         return 0;
355 }
356
357 static int acpi_processor_remove_fs(struct acpi_device *device)
358 {
359
360         if (acpi_device_dir(device)) {
361                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
362                                   acpi_device_dir(device));
363                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
364                                   acpi_device_dir(device));
365                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
366                                   acpi_device_dir(device));
367                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
368                 acpi_device_dir(device) = NULL;
369         }
370
371         return 0;
372 }
373
374 /* Use the acpiid in MADT to map cpus in case of SMP */
375
376 #ifndef CONFIG_SMP
377 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
378 #else
379
380 static struct acpi_table_madt *madt;
381
382 static int map_lapic_id(struct acpi_subtable_header *entry,
383                  u32 acpi_id, int *apic_id)
384 {
385         struct acpi_madt_local_apic *lapic =
386                 (struct acpi_madt_local_apic *)entry;
387         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
388             lapic->processor_id == acpi_id) {
389                 *apic_id = lapic->id;
390                 return 1;
391         }
392         return 0;
393 }
394
395 static int map_lsapic_id(struct acpi_subtable_header *entry,
396                   u32 acpi_id, int *apic_id)
397 {
398         struct acpi_madt_local_sapic *lsapic =
399                 (struct acpi_madt_local_sapic *)entry;
400         /* Only check enabled APICs*/
401         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
402                 /* First check against id */
403                 if (lsapic->processor_id == acpi_id) {
404                         *apic_id = (lsapic->id << 8) | lsapic->eid;
405                         return 1;
406                 /* Check against optional uid */
407                 } else if (entry->length >= 16 &&
408                         lsapic->uid == acpi_id) {
409                         *apic_id = lsapic->uid;
410                         return 1;
411                 }
412         }
413         return 0;
414 }
415
416 #ifdef CONFIG_IA64
417 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
418 #else
419 #define arch_cpu_to_apicid      x86_cpu_to_apicid
420 #endif
421
422 static int map_madt_entry(u32 acpi_id)
423 {
424         unsigned long madt_end, entry;
425         int apic_id = -1;
426
427         if (!madt)
428                 return apic_id;
429
430         entry = (unsigned long)madt;
431         madt_end = entry + madt->header.length;
432
433         /* Parse all entries looking for a match. */
434
435         entry += sizeof(struct acpi_table_madt);
436         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
437                 struct acpi_subtable_header *header =
438                         (struct acpi_subtable_header *)entry;
439                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
440                         if (map_lapic_id(header, acpi_id, &apic_id))
441                                 break;
442                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
443                         if (map_lsapic_id(header, acpi_id, &apic_id))
444                                 break;
445                 }
446                 entry += header->length;
447         }
448         return apic_id;
449 }
450
451 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
452 {
453         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
454         union acpi_object *obj;
455         struct acpi_subtable_header *header;
456         int apic_id = -1;
457
458         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
459                 goto exit;
460
461         if (!buffer.length || !buffer.pointer)
462                 goto exit;
463
464         obj = buffer.pointer;
465         if (obj->type != ACPI_TYPE_BUFFER ||
466             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
467                 goto exit;
468         }
469
470         header = (struct acpi_subtable_header *)obj->buffer.pointer;
471         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
472                 map_lapic_id(header, acpi_id, &apic_id);
473         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
474                 map_lsapic_id(header, acpi_id, &apic_id);
475         }
476
477 exit:
478         if (buffer.pointer)
479                 kfree(buffer.pointer);
480         return apic_id;
481 }
482
483 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
484 {
485         int i;
486         int apic_id = -1;
487
488         apic_id = map_mat_entry(handle, acpi_id);
489         if (apic_id == -1)
490                 apic_id = map_madt_entry(acpi_id);
491         if (apic_id == -1)
492                 return apic_id;
493
494         for (i = 0; i < NR_CPUS; ++i) {
495                 if (arch_cpu_to_apicid[i] == apic_id)
496                         return i;
497         }
498         return -1;
499 }
500 #endif
501
502 /* --------------------------------------------------------------------------
503                                  Driver Interface
504    -------------------------------------------------------------------------- */
505
506 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
507 {
508         acpi_status status = 0;
509         union acpi_object object = { 0 };
510         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
511         int cpu_index;
512         static int cpu0_initialized;
513
514
515         if (!pr)
516                 return -EINVAL;
517
518         if (num_online_cpus() > 1)
519                 errata.smp = TRUE;
520
521         acpi_processor_errata(pr);
522
523         /*
524          * Check to see if we have bus mastering arbitration control.  This
525          * is required for proper C3 usage (to maintain cache coherency).
526          */
527         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
528                 pr->flags.bm_control = 1;
529                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
530                                   "Bus mastering arbitration control present\n"));
531         } else
532                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
533                                   "No bus mastering arbitration control\n"));
534
535         /* Check if it is a Device with HID and UID */
536         if (has_uid) {
537                 unsigned long value;
538                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
539                                                 NULL, &value);
540                 if (ACPI_FAILURE(status)) {
541                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
542                         return -ENODEV;
543                 }
544                 pr->acpi_id = value;
545         } else {
546                 /*
547                 * Evalute the processor object.  Note that it is common on SMP to
548                 * have the first (boot) processor with a valid PBLK address while
549                 * all others have a NULL address.
550                 */
551                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
552                 if (ACPI_FAILURE(status)) {
553                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
554                         return -ENODEV;
555                 }
556
557                 /*
558                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
559                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
560                 */
561                 pr->acpi_id = object.processor.proc_id;
562         }
563         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
564
565         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
566         if (!cpu0_initialized && (cpu_index == -1) &&
567             (num_online_cpus() == 1)) {
568                 cpu_index = 0;
569         }
570
571         cpu0_initialized = 1;
572
573         pr->id = cpu_index;
574
575         /*
576          *  Extra Processor objects may be enumerated on MP systems with
577          *  less than the max # of CPUs. They should be ignored _iff
578          *  they are physically not present.
579          */
580         if (pr->id == -1) {
581                 if (ACPI_FAILURE
582                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
583                         return -ENODEV;
584                 }
585         }
586
587         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
588                           pr->acpi_id));
589
590         if (!object.processor.pblk_address)
591                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
592         else if (object.processor.pblk_length != 6)
593                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
594                             object.processor.pblk_length);
595         else {
596                 pr->throttling.address = object.processor.pblk_address;
597                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
598                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
599
600                 pr->pblk = object.processor.pblk_address;
601
602                 /*
603                  * We don't care about error returns - we just try to mark
604                  * these reserved so that nobody else is confused into thinking
605                  * that this region might be unused..
606                  *
607                  * (In particular, allocating the IO range for Cardbus)
608                  */
609                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
610         }
611
612 #ifdef CONFIG_CPU_FREQ
613         acpi_processor_ppc_has_changed(pr);
614 #endif
615         acpi_processor_get_throttling_info(pr);
616         acpi_processor_get_limit_info(pr);
617
618         return 0;
619 }
620
621 static void *processor_device_array[NR_CPUS];
622
623 static int __cpuinit acpi_processor_start(struct acpi_device *device)
624 {
625         int result = 0;
626         acpi_status status = AE_OK;
627         struct acpi_processor *pr;
628
629
630         pr = acpi_driver_data(device);
631
632         result = acpi_processor_get_info(pr, device->flags.unique_id);
633         if (result) {
634                 /* Processor is physically not present */
635                 return 0;
636         }
637
638         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
639
640         /*
641          * Buggy BIOS check
642          * ACPI id of processors can be reported wrongly by the BIOS.
643          * Don't trust it blindly
644          */
645         if (processor_device_array[pr->id] != NULL &&
646             processor_device_array[pr->id] != device) {
647                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
648                         "for the processor\n");
649                 return -ENODEV;
650         }
651         processor_device_array[pr->id] = device;
652
653         processors[pr->id] = pr;
654
655         result = acpi_processor_add_fs(device);
656         if (result)
657                 goto end;
658
659         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
660                                              acpi_processor_notify, pr);
661
662         /* _PDC call should be done before doing anything else (if reqd.). */
663         arch_acpi_processor_init_pdc(pr);
664         acpi_processor_set_pdc(pr);
665
666         acpi_processor_power_init(pr, device);
667
668         if (pr->flags.throttling) {
669                 printk(KERN_INFO PREFIX "%s [%s] (supports",
670                        acpi_device_name(device), acpi_device_bid(device));
671                 printk(" %d throttling states", pr->throttling.state_count);
672                 printk(")\n");
673         }
674
675       end:
676
677         return result;
678 }
679
680 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
681 {
682         struct acpi_processor *pr = data;
683         struct acpi_device *device = NULL;
684
685
686         if (!pr)
687                 return;
688
689         if (acpi_bus_get_device(pr->handle, &device))
690                 return;
691
692         switch (event) {
693         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
694                 acpi_processor_ppc_has_changed(pr);
695                 acpi_bus_generate_event(device, event,
696                                         pr->performance_platform_limit);
697                 break;
698         case ACPI_PROCESSOR_NOTIFY_POWER:
699                 acpi_processor_cst_has_changed(pr);
700                 acpi_bus_generate_event(device, event, 0);
701                 break;
702         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
703                 acpi_processor_tstate_has_changed(pr);
704                 acpi_bus_generate_event(device, event, 0);
705         default:
706                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
707                                   "Unsupported event [0x%x]\n", event));
708                 break;
709         }
710
711         return;
712 }
713
714 static int acpi_processor_add(struct acpi_device *device)
715 {
716         struct acpi_processor *pr = NULL;
717
718
719         if (!device)
720                 return -EINVAL;
721
722         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
723         if (!pr)
724                 return -ENOMEM;
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         acpi_driver_data(device) = pr;
730
731         return 0;
732 }
733
734 static int acpi_processor_remove(struct acpi_device *device, int type)
735 {
736         acpi_status status = AE_OK;
737         struct acpi_processor *pr = NULL;
738
739
740         if (!device || !acpi_driver_data(device))
741                 return -EINVAL;
742
743         pr = acpi_driver_data(device);
744
745         if (pr->id >= NR_CPUS) {
746                 kfree(pr);
747                 return 0;
748         }
749
750         if (type == ACPI_BUS_REMOVAL_EJECT) {
751                 if (acpi_processor_handle_eject(pr))
752                         return -EINVAL;
753         }
754
755         acpi_processor_power_exit(pr, device);
756
757         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
758                                             acpi_processor_notify);
759
760         acpi_processor_remove_fs(device);
761
762         processors[pr->id] = NULL;
763
764         kfree(pr);
765
766         return 0;
767 }
768
769 #ifdef CONFIG_ACPI_HOTPLUG_CPU
770 /****************************************************************************
771  *      Acpi processor hotplug support                                      *
772  ****************************************************************************/
773
774 static int is_processor_present(acpi_handle handle);
775
776 static int is_processor_present(acpi_handle handle)
777 {
778         acpi_status status;
779         unsigned long sta = 0;
780
781
782         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
783         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
784                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
785                 return 0;
786         }
787         return 1;
788 }
789
790 static
791 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
792 {
793         acpi_handle phandle;
794         struct acpi_device *pdev;
795         struct acpi_processor *pr;
796
797
798         if (acpi_get_parent(handle, &phandle)) {
799                 return -ENODEV;
800         }
801
802         if (acpi_bus_get_device(phandle, &pdev)) {
803                 return -ENODEV;
804         }
805
806         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
807                 return -ENODEV;
808         }
809
810         acpi_bus_start(*device);
811
812         pr = acpi_driver_data(*device);
813         if (!pr)
814                 return -ENODEV;
815
816         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
817                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
818         }
819         return 0;
820 }
821
822 static void
823 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
824 {
825         struct acpi_processor *pr;
826         struct acpi_device *device = NULL;
827         int result;
828
829
830         switch (event) {
831         case ACPI_NOTIFY_BUS_CHECK:
832         case ACPI_NOTIFY_DEVICE_CHECK:
833                 printk("Processor driver received %s event\n",
834                        (event == ACPI_NOTIFY_BUS_CHECK) ?
835                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
836
837                 if (!is_processor_present(handle))
838                         break;
839
840                 if (acpi_bus_get_device(handle, &device)) {
841                         result = acpi_processor_device_add(handle, &device);
842                         if (result)
843                                 printk(KERN_ERR PREFIX
844                                             "Unable to add the device\n");
845                         break;
846                 }
847
848                 pr = acpi_driver_data(device);
849                 if (!pr) {
850                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
851                         break;
852                 }
853
854                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
855                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
856                         break;
857                 }
858
859                 result = acpi_processor_start(device);
860                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
861                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
862                 } else {
863                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
864                                     acpi_device_bid(device));
865                 }
866                 break;
867         case ACPI_NOTIFY_EJECT_REQUEST:
868                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
869                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
870
871                 if (acpi_bus_get_device(handle, &device)) {
872                         printk(KERN_ERR PREFIX
873                                     "Device don't exist, dropping EJECT\n");
874                         break;
875                 }
876                 pr = acpi_driver_data(device);
877                 if (!pr) {
878                         printk(KERN_ERR PREFIX
879                                     "Driver data is NULL, dropping EJECT\n");
880                         return;
881                 }
882
883                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
884                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
885                 break;
886         default:
887                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
888                                   "Unsupported event [0x%x]\n", event));
889                 break;
890         }
891
892         return;
893 }
894
895 static acpi_status
896 processor_walk_namespace_cb(acpi_handle handle,
897                             u32 lvl, void *context, void **rv)
898 {
899         acpi_status status;
900         int *action = context;
901         acpi_object_type type = 0;
902
903         status = acpi_get_type(handle, &type);
904         if (ACPI_FAILURE(status))
905                 return (AE_OK);
906
907         if (type != ACPI_TYPE_PROCESSOR)
908                 return (AE_OK);
909
910         switch (*action) {
911         case INSTALL_NOTIFY_HANDLER:
912                 acpi_install_notify_handler(handle,
913                                             ACPI_SYSTEM_NOTIFY,
914                                             acpi_processor_hotplug_notify,
915                                             NULL);
916                 break;
917         case UNINSTALL_NOTIFY_HANDLER:
918                 acpi_remove_notify_handler(handle,
919                                            ACPI_SYSTEM_NOTIFY,
920                                            acpi_processor_hotplug_notify);
921                 break;
922         default:
923                 break;
924         }
925
926         return (AE_OK);
927 }
928
929 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
930 {
931
932         if (!is_processor_present(handle)) {
933                 return AE_ERROR;
934         }
935
936         if (acpi_map_lsapic(handle, p_cpu))
937                 return AE_ERROR;
938
939         if (arch_register_cpu(*p_cpu)) {
940                 acpi_unmap_lsapic(*p_cpu);
941                 return AE_ERROR;
942         }
943
944         return AE_OK;
945 }
946
947 static int acpi_processor_handle_eject(struct acpi_processor *pr)
948 {
949         if (cpu_online(pr->id)) {
950                 return (-EINVAL);
951         }
952         arch_unregister_cpu(pr->id);
953         acpi_unmap_lsapic(pr->id);
954         return (0);
955 }
956 #else
957 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
958 {
959         return AE_ERROR;
960 }
961 static int acpi_processor_handle_eject(struct acpi_processor *pr)
962 {
963         return (-EINVAL);
964 }
965 #endif
966
967 static
968 void acpi_processor_install_hotplug_notify(void)
969 {
970 #ifdef CONFIG_ACPI_HOTPLUG_CPU
971         int action = INSTALL_NOTIFY_HANDLER;
972         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
973                             ACPI_ROOT_OBJECT,
974                             ACPI_UINT32_MAX,
975                             processor_walk_namespace_cb, &action, NULL);
976 #endif
977 }
978
979 static
980 void acpi_processor_uninstall_hotplug_notify(void)
981 {
982 #ifdef CONFIG_ACPI_HOTPLUG_CPU
983         int action = UNINSTALL_NOTIFY_HANDLER;
984         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
985                             ACPI_ROOT_OBJECT,
986                             ACPI_UINT32_MAX,
987                             processor_walk_namespace_cb, &action, NULL);
988 #endif
989 }
990
991 /*
992  * We keep the driver loaded even when ACPI is not running.
993  * This is needed for the powernow-k8 driver, that works even without
994  * ACPI, but needs symbols from this driver
995  */
996
997 static int __init acpi_processor_init(void)
998 {
999         int result = 0;
1000
1001
1002         memset(&processors, 0, sizeof(processors));
1003         memset(&errata, 0, sizeof(errata));
1004
1005 #ifdef CONFIG_SMP
1006         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1007                                 (struct acpi_table_header **)&madt)))
1008                 madt = NULL;
1009 #endif
1010
1011         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1012         if (!acpi_processor_dir)
1013                 return -ENOMEM;
1014         acpi_processor_dir->owner = THIS_MODULE;
1015
1016         result = acpi_bus_register_driver(&acpi_processor_driver);
1017         if (result < 0) {
1018                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1019                 return result;
1020         }
1021
1022         acpi_processor_install_hotplug_notify();
1023
1024         acpi_thermal_cpufreq_init();
1025
1026         acpi_processor_ppc_init();
1027
1028         return 0;
1029 }
1030
1031 static void __exit acpi_processor_exit(void)
1032 {
1033
1034         acpi_processor_ppc_exit();
1035
1036         acpi_thermal_cpufreq_exit();
1037
1038         acpi_processor_uninstall_hotplug_notify();
1039
1040         acpi_bus_unregister_driver(&acpi_processor_driver);
1041
1042         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1043
1044         return;
1045 }
1046
1047 module_init(acpi_processor_init);
1048 module_exit(acpi_processor_exit);
1049
1050 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1051
1052 MODULE_ALIAS("processor");