ACPI: delete extra #defines in /drivers/acpi/ drivers
[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
70 #define ACPI_PROCESSOR_LIMIT_USER       0
71 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
72
73 #define ACPI_STA_PRESENT 0x00000001
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
90 static struct acpi_driver acpi_processor_driver = {
91         .name = "processor",
92         .class = ACPI_PROCESSOR_CLASS,
93         .ids = ACPI_PROCESSOR_HID,
94         .ops = {
95                 .add = acpi_processor_add,
96                 .remove = acpi_processor_remove,
97                 .start = acpi_processor_start,
98                 },
99 };
100
101 #define INSTALL_NOTIFY_HANDLER          1
102 #define UNINSTALL_NOTIFY_HANDLER        2
103
104 static const struct file_operations acpi_processor_info_fops = {
105         .open = acpi_processor_info_open_fs,
106         .read = seq_read,
107         .llseek = seq_lseek,
108         .release = single_release,
109 };
110
111 struct acpi_processor *processors[NR_CPUS];
112 struct acpi_processor_errata errata __read_mostly;
113
114 /* --------------------------------------------------------------------------
115                                 Errata Handling
116    -------------------------------------------------------------------------- */
117
118 static int acpi_processor_errata_piix4(struct pci_dev *dev)
119 {
120         u8 rev = 0;
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         pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
133
134         switch (rev) {
135         case 0:
136                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
137                 break;
138         case 1:
139                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
140                 break;
141         case 2:
142                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
143                 break;
144         case 3:
145                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
146                 break;
147         default:
148                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
149                 break;
150         }
151
152         switch (rev) {
153
154         case 0:         /* PIIX4 A-step */
155         case 1:         /* PIIX4 B-step */
156                 /*
157                  * See specification changes #13 ("Manual Throttle Duty Cycle")
158                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
159                  * erratum #5 ("STPCLK# Deassertion Time") from the January
160                  * 2002 PIIX4 specification update.  Applies to only older
161                  * PIIX4 models.
162                  */
163                 errata.piix4.throttle = 1;
164
165         case 2:         /* PIIX4E */
166         case 3:         /* PIIX4M */
167                 /*
168                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
169                  * Livelock") from the January 2002 PIIX4 specification update.
170                  * Applies to all PIIX4 models.
171                  */
172
173                 /*
174                  * BM-IDE
175                  * ------
176                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
177                  * Status register address.  We'll use this later to read
178                  * each IDE controller's DMA status to make sure we catch all
179                  * DMA activity.
180                  */
181                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
182                                      PCI_DEVICE_ID_INTEL_82371AB,
183                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
184                 if (dev) {
185                         errata.piix4.bmisx = pci_resource_start(dev, 4);
186                         pci_dev_put(dev);
187                 }
188
189                 /*
190                  * Type-F DMA
191                  * ----------
192                  * Find the PIIX4 ISA Controller and read the Motherboard
193                  * DMA controller's status to see if Type-F (Fast) DMA mode
194                  * is enabled (bit 7) on either channel.  Note that we'll
195                  * disable C3 support if this is enabled, as some legacy
196                  * devices won't operate well if fast DMA is disabled.
197                  */
198                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
199                                      PCI_DEVICE_ID_INTEL_82371AB_0,
200                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
201                 if (dev) {
202                         pci_read_config_byte(dev, 0x76, &value1);
203                         pci_read_config_byte(dev, 0x77, &value2);
204                         if ((value1 & 0x80) || (value2 & 0x80))
205                                 errata.piix4.fdma = 1;
206                         pci_dev_put(dev);
207                 }
208
209                 break;
210         }
211
212         if (errata.piix4.bmisx)
213                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
214                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
215         if (errata.piix4.fdma)
216                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
217                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
218
219         return 0;
220 }
221
222 static int acpi_processor_errata(struct acpi_processor *pr)
223 {
224         int result = 0;
225         struct pci_dev *dev = NULL;
226
227
228         if (!pr)
229                 return -EINVAL;
230
231         /*
232          * PIIX4
233          */
234         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
235                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
236                              PCI_ANY_ID, NULL);
237         if (dev) {
238                 result = acpi_processor_errata_piix4(dev);
239                 pci_dev_put(dev);
240         }
241
242         return result;
243 }
244
245 /* --------------------------------------------------------------------------
246                               Common ACPI processor functions
247    -------------------------------------------------------------------------- */
248
249 /*
250  * _PDC is required for a BIOS-OS handshake for most of the newer
251  * ACPI processor features.
252  */
253 static int acpi_processor_set_pdc(struct acpi_processor *pr)
254 {
255         struct acpi_object_list *pdc_in = pr->pdc;
256         acpi_status status = AE_OK;
257
258
259         if (!pdc_in)
260                 return status;
261
262         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
263
264         if (ACPI_FAILURE(status))
265                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
266                     "Could not evaluate _PDC, using legacy perf. control...\n"));
267
268         return status;
269 }
270
271 /* --------------------------------------------------------------------------
272                               FS Interface (/proc)
273    -------------------------------------------------------------------------- */
274
275 static struct proc_dir_entry *acpi_processor_dir = NULL;
276
277 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
278 {
279         struct acpi_processor *pr = seq->private;
280
281
282         if (!pr)
283                 goto end;
284
285         seq_printf(seq, "processor id:            %d\n"
286                    "acpi id:                 %d\n"
287                    "bus mastering control:   %s\n"
288                    "power management:        %s\n"
289                    "throttling control:      %s\n"
290                    "limit interface:         %s\n",
291                    pr->id,
292                    pr->acpi_id,
293                    pr->flags.bm_control ? "yes" : "no",
294                    pr->flags.power ? "yes" : "no",
295                    pr->flags.throttling ? "yes" : "no",
296                    pr->flags.limit ? "yes" : "no");
297
298       end:
299         return 0;
300 }
301
302 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
303 {
304         return single_open(file, acpi_processor_info_seq_show,
305                            PDE(inode)->data);
306 }
307
308 static int acpi_processor_add_fs(struct acpi_device *device)
309 {
310         struct proc_dir_entry *entry = NULL;
311
312
313         if (!acpi_device_dir(device)) {
314                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
315                                                      acpi_processor_dir);
316                 if (!acpi_device_dir(device))
317                         return -ENODEV;
318         }
319         acpi_device_dir(device)->owner = THIS_MODULE;
320
321         /* 'info' [R] */
322         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
323                                   S_IRUGO, acpi_device_dir(device));
324         if (!entry)
325                 return -EIO;
326         else {
327                 entry->proc_fops = &acpi_processor_info_fops;
328                 entry->data = acpi_driver_data(device);
329                 entry->owner = THIS_MODULE;
330         }
331
332         /* 'throttling' [R/W] */
333         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
334                                   S_IFREG | S_IRUGO | S_IWUSR,
335                                   acpi_device_dir(device));
336         if (!entry)
337                 return -EIO;
338         else {
339                 entry->proc_fops = &acpi_processor_throttling_fops;
340                 entry->data = acpi_driver_data(device);
341                 entry->owner = THIS_MODULE;
342         }
343
344         /* 'limit' [R/W] */
345         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
346                                   S_IFREG | S_IRUGO | S_IWUSR,
347                                   acpi_device_dir(device));
348         if (!entry)
349                 return -EIO;
350         else {
351                 entry->proc_fops = &acpi_processor_limit_fops;
352                 entry->data = acpi_driver_data(device);
353                 entry->owner = THIS_MODULE;
354         }
355
356         return 0;
357 }
358
359 static int acpi_processor_remove_fs(struct acpi_device *device)
360 {
361
362         if (acpi_device_dir(device)) {
363                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
364                                   acpi_device_dir(device));
365                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
366                                   acpi_device_dir(device));
367                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
368                                   acpi_device_dir(device));
369                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
370                 acpi_device_dir(device) = NULL;
371         }
372
373         return 0;
374 }
375
376 /* Use the acpiid in MADT to map cpus in case of SMP */
377
378 #ifndef CONFIG_SMP
379 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
380 #else
381
382 static struct acpi_table_madt *madt;
383
384 static int map_lapic_id(struct acpi_subtable_header *entry,
385                  u32 acpi_id, int *apic_id)
386 {
387         struct acpi_madt_local_apic *lapic =
388                 (struct acpi_madt_local_apic *)entry;
389         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
390             lapic->processor_id == acpi_id) {
391                 *apic_id = lapic->id;
392                 return 1;
393         }
394         return 0;
395 }
396
397 static int map_lsapic_id(struct acpi_subtable_header *entry,
398                   u32 acpi_id, int *apic_id)
399 {
400         struct acpi_madt_local_sapic *lsapic =
401                 (struct acpi_madt_local_sapic *)entry;
402         /* Only check enabled APICs*/
403         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
404                 /* First check against id */
405                 if (lsapic->processor_id == acpi_id) {
406                         *apic_id = lsapic->id;
407                         return 1;
408                 /* Check against optional uid */
409                 } else if (entry->length >= 16 &&
410                         lsapic->uid == acpi_id) {
411                         *apic_id = lsapic->uid;
412                         return 1;
413                 }
414         }
415         return 0;
416 }
417
418 #ifdef CONFIG_IA64
419 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
420 #else
421 #define arch_cpu_to_apicid      x86_cpu_to_apicid
422 #endif
423
424 static int map_madt_entry(u32 acpi_id)
425 {
426         unsigned long madt_end, entry;
427         int apic_id = -1;
428
429         if (!madt)
430                 return apic_id;
431
432         entry = (unsigned long)madt;
433         madt_end = entry + madt->header.length;
434
435         /* Parse all entries looking for a match. */
436
437         entry += sizeof(struct acpi_table_madt);
438         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
439                 struct acpi_subtable_header *header =
440                         (struct acpi_subtable_header *)entry;
441                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
442                         if (map_lapic_id(header, acpi_id, &apic_id))
443                                 break;
444                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
445                         if (map_lsapic_id(header, acpi_id, &apic_id))
446                                 break;
447                 }
448                 entry += header->length;
449         }
450         return apic_id;
451 }
452
453 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
454 {
455         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
456         union acpi_object *obj;
457         struct acpi_subtable_header *header;
458         int apic_id = -1;
459
460         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
461                 goto exit;
462
463         if (!buffer.length || !buffer.pointer)
464                 goto exit;
465
466         obj = buffer.pointer;
467         if (obj->type != ACPI_TYPE_BUFFER ||
468             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
469                 goto exit;
470         }
471
472         header = (struct acpi_subtable_header *)obj->buffer.pointer;
473         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
474                 map_lapic_id(header, acpi_id, &apic_id);
475         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
476                 map_lsapic_id(header, acpi_id, &apic_id);
477         }
478
479 exit:
480         if (buffer.pointer)
481                 kfree(buffer.pointer);
482         return apic_id;
483 }
484
485 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
486 {
487         int i;
488         int apic_id = -1;
489
490         apic_id = map_mat_entry(handle, acpi_id);
491         if (apic_id == -1)
492                 apic_id = map_madt_entry(acpi_id);
493         if (apic_id == -1)
494                 return apic_id;
495
496         for (i = 0; i < NR_CPUS; ++i) {
497                 if (arch_cpu_to_apicid[i] == apic_id)
498                         return i;
499         }
500         return -1;
501 }
502 #endif
503
504 /* --------------------------------------------------------------------------
505                                  Driver Interface
506    -------------------------------------------------------------------------- */
507
508 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
509 {
510         acpi_status status = 0;
511         union acpi_object object = { 0 };
512         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
513         int cpu_index;
514         static int cpu0_initialized;
515
516
517         if (!pr)
518                 return -EINVAL;
519
520         if (num_online_cpus() > 1)
521                 errata.smp = TRUE;
522
523         acpi_processor_errata(pr);
524
525         /*
526          * Check to see if we have bus mastering arbitration control.  This
527          * is required for proper C3 usage (to maintain cache coherency).
528          */
529         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
530                 pr->flags.bm_control = 1;
531                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
532                                   "Bus mastering arbitration control present\n"));
533         } else
534                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
535                                   "No bus mastering arbitration control\n"));
536
537         /* Check if it is a Device with HID and UID */
538         if (has_uid) {
539                 unsigned long value;
540                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
541                                                 NULL, &value);
542                 if (ACPI_FAILURE(status)) {
543                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
544                         return -ENODEV;
545                 }
546                 pr->acpi_id = value;
547         } else {
548                 /*
549                 * Evalute the processor object.  Note that it is common on SMP to
550                 * have the first (boot) processor with a valid PBLK address while
551                 * all others have a NULL address.
552                 */
553                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
554                 if (ACPI_FAILURE(status)) {
555                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
556                         return -ENODEV;
557                 }
558
559                 /*
560                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
561                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
562                 */
563                 pr->acpi_id = object.processor.proc_id;
564         }
565         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
566
567         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
568         if (!cpu0_initialized && (cpu_index == -1) &&
569             (num_online_cpus() == 1)) {
570                 cpu_index = 0;
571         }
572
573         cpu0_initialized = 1;
574
575         pr->id = cpu_index;
576
577         /*
578          *  Extra Processor objects may be enumerated on MP systems with
579          *  less than the max # of CPUs. They should be ignored _iff
580          *  they are physically not present.
581          */
582         if (pr->id == -1) {
583                 if (ACPI_FAILURE
584                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
585                         return -ENODEV;
586                 }
587         }
588
589         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
590                           pr->acpi_id));
591
592         if (!object.processor.pblk_address)
593                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
594         else if (object.processor.pblk_length != 6)
595                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
596                             object.processor.pblk_length);
597         else {
598                 pr->throttling.address = object.processor.pblk_address;
599                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
600                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
601
602                 pr->pblk = object.processor.pblk_address;
603
604                 /*
605                  * We don't care about error returns - we just try to mark
606                  * these reserved so that nobody else is confused into thinking
607                  * that this region might be unused..
608                  *
609                  * (In particular, allocating the IO range for Cardbus)
610                  */
611                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
612         }
613
614 #ifdef CONFIG_CPU_FREQ
615         acpi_processor_ppc_has_changed(pr);
616 #endif
617         acpi_processor_get_throttling_info(pr);
618         acpi_processor_get_limit_info(pr);
619
620         return 0;
621 }
622
623 static void *processor_device_array[NR_CPUS];
624
625 static int __cpuinit acpi_processor_start(struct acpi_device *device)
626 {
627         int result = 0;
628         acpi_status status = AE_OK;
629         struct acpi_processor *pr;
630
631
632         pr = acpi_driver_data(device);
633
634         result = acpi_processor_get_info(pr, device->flags.unique_id);
635         if (result) {
636                 /* Processor is physically not present */
637                 return 0;
638         }
639
640         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
641
642         /*
643          * Buggy BIOS check
644          * ACPI id of processors can be reported wrongly by the BIOS.
645          * Don't trust it blindly
646          */
647         if (processor_device_array[pr->id] != NULL &&
648             processor_device_array[pr->id] != device) {
649                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
650                         "for the processor\n");
651                 return -ENODEV;
652         }
653         processor_device_array[pr->id] = device;
654
655         processors[pr->id] = pr;
656
657         result = acpi_processor_add_fs(device);
658         if (result)
659                 goto end;
660
661         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
662                                              acpi_processor_notify, pr);
663
664         /* _PDC call should be done before doing anything else (if reqd.). */
665         arch_acpi_processor_init_pdc(pr);
666         acpi_processor_set_pdc(pr);
667
668         acpi_processor_power_init(pr, device);
669
670         if (pr->flags.throttling) {
671                 printk(KERN_INFO PREFIX "%s [%s] (supports",
672                        acpi_device_name(device), acpi_device_bid(device));
673                 printk(" %d throttling states", pr->throttling.state_count);
674                 printk(")\n");
675         }
676
677       end:
678
679         return result;
680 }
681
682 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
683 {
684         struct acpi_processor *pr = data;
685         struct acpi_device *device = NULL;
686
687
688         if (!pr)
689                 return;
690
691         if (acpi_bus_get_device(pr->handle, &device))
692                 return;
693
694         switch (event) {
695         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
696                 acpi_processor_ppc_has_changed(pr);
697                 acpi_bus_generate_event(device, event,
698                                         pr->performance_platform_limit);
699                 break;
700         case ACPI_PROCESSOR_NOTIFY_POWER:
701                 acpi_processor_cst_has_changed(pr);
702                 acpi_bus_generate_event(device, event, 0);
703                 break;
704         default:
705                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
706                                   "Unsupported event [0x%x]\n", event));
707                 break;
708         }
709
710         return;
711 }
712
713 static int acpi_processor_add(struct acpi_device *device)
714 {
715         struct acpi_processor *pr = NULL;
716
717
718         if (!device)
719                 return -EINVAL;
720
721         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
722         if (!pr)
723                 return -ENOMEM;
724
725         pr->handle = device->handle;
726         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
727         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
728         acpi_driver_data(device) = pr;
729
730         return 0;
731 }
732
733 static int acpi_processor_remove(struct acpi_device *device, int type)
734 {
735         acpi_status status = AE_OK;
736         struct acpi_processor *pr = NULL;
737
738
739         if (!device || !acpi_driver_data(device))
740                 return -EINVAL;
741
742         pr = acpi_driver_data(device);
743
744         if (pr->id >= NR_CPUS) {
745                 kfree(pr);
746                 return 0;
747         }
748
749         if (type == ACPI_BUS_REMOVAL_EJECT) {
750                 if (acpi_processor_handle_eject(pr))
751                         return -EINVAL;
752         }
753
754         acpi_processor_power_exit(pr, device);
755
756         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
757                                             acpi_processor_notify);
758
759         acpi_processor_remove_fs(device);
760
761         processors[pr->id] = NULL;
762
763         kfree(pr);
764
765         return 0;
766 }
767
768 #ifdef CONFIG_ACPI_HOTPLUG_CPU
769 /****************************************************************************
770  *      Acpi processor hotplug support                                      *
771  ****************************************************************************/
772
773 static int is_processor_present(acpi_handle handle);
774
775 static int is_processor_present(acpi_handle handle)
776 {
777         acpi_status status;
778         unsigned long sta = 0;
779
780
781         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
782         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
783                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
784                 return 0;
785         }
786         return 1;
787 }
788
789 static
790 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
791 {
792         acpi_handle phandle;
793         struct acpi_device *pdev;
794         struct acpi_processor *pr;
795
796
797         if (acpi_get_parent(handle, &phandle)) {
798                 return -ENODEV;
799         }
800
801         if (acpi_bus_get_device(phandle, &pdev)) {
802                 return -ENODEV;
803         }
804
805         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
806                 return -ENODEV;
807         }
808
809         acpi_bus_start(*device);
810
811         pr = acpi_driver_data(*device);
812         if (!pr)
813                 return -ENODEV;
814
815         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
816                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
817         }
818         return 0;
819 }
820
821 static void
822 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
823 {
824         struct acpi_processor *pr;
825         struct acpi_device *device = NULL;
826         int result;
827
828
829         switch (event) {
830         case ACPI_NOTIFY_BUS_CHECK:
831         case ACPI_NOTIFY_DEVICE_CHECK:
832                 printk("Processor driver received %s event\n",
833                        (event == ACPI_NOTIFY_BUS_CHECK) ?
834                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
835
836                 if (!is_processor_present(handle))
837                         break;
838
839                 if (acpi_bus_get_device(handle, &device)) {
840                         result = acpi_processor_device_add(handle, &device);
841                         if (result)
842                                 printk(KERN_ERR PREFIX
843                                             "Unable to add the device\n");
844                         break;
845                 }
846
847                 pr = acpi_driver_data(device);
848                 if (!pr) {
849                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
850                         break;
851                 }
852
853                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
854                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
855                         break;
856                 }
857
858                 result = acpi_processor_start(device);
859                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
860                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
861                 } else {
862                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
863                                     acpi_device_bid(device));
864                 }
865                 break;
866         case ACPI_NOTIFY_EJECT_REQUEST:
867                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
868                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
869
870                 if (acpi_bus_get_device(handle, &device)) {
871                         printk(KERN_ERR PREFIX
872                                     "Device don't exist, dropping EJECT\n");
873                         break;
874                 }
875                 pr = acpi_driver_data(device);
876                 if (!pr) {
877                         printk(KERN_ERR PREFIX
878                                     "Driver data is NULL, dropping EJECT\n");
879                         return;
880                 }
881
882                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
883                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
884                 break;
885         default:
886                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
887                                   "Unsupported event [0x%x]\n", event));
888                 break;
889         }
890
891         return;
892 }
893
894 static acpi_status
895 processor_walk_namespace_cb(acpi_handle handle,
896                             u32 lvl, void *context, void **rv)
897 {
898         acpi_status status;
899         int *action = context;
900         acpi_object_type type = 0;
901
902         status = acpi_get_type(handle, &type);
903         if (ACPI_FAILURE(status))
904                 return (AE_OK);
905
906         if (type != ACPI_TYPE_PROCESSOR)
907                 return (AE_OK);
908
909         switch (*action) {
910         case INSTALL_NOTIFY_HANDLER:
911                 acpi_install_notify_handler(handle,
912                                             ACPI_SYSTEM_NOTIFY,
913                                             acpi_processor_hotplug_notify,
914                                             NULL);
915                 break;
916         case UNINSTALL_NOTIFY_HANDLER:
917                 acpi_remove_notify_handler(handle,
918                                            ACPI_SYSTEM_NOTIFY,
919                                            acpi_processor_hotplug_notify);
920                 break;
921         default:
922                 break;
923         }
924
925         return (AE_OK);
926 }
927
928 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
929 {
930
931         if (!is_processor_present(handle)) {
932                 return AE_ERROR;
933         }
934
935         if (acpi_map_lsapic(handle, p_cpu))
936                 return AE_ERROR;
937
938         if (arch_register_cpu(*p_cpu)) {
939                 acpi_unmap_lsapic(*p_cpu);
940                 return AE_ERROR;
941         }
942
943         return AE_OK;
944 }
945
946 static int acpi_processor_handle_eject(struct acpi_processor *pr)
947 {
948         if (cpu_online(pr->id)) {
949                 return (-EINVAL);
950         }
951         arch_unregister_cpu(pr->id);
952         acpi_unmap_lsapic(pr->id);
953         return (0);
954 }
955 #else
956 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
957 {
958         return AE_ERROR;
959 }
960 static int acpi_processor_handle_eject(struct acpi_processor *pr)
961 {
962         return (-EINVAL);
963 }
964 #endif
965
966 static
967 void acpi_processor_install_hotplug_notify(void)
968 {
969 #ifdef CONFIG_ACPI_HOTPLUG_CPU
970         int action = INSTALL_NOTIFY_HANDLER;
971         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
972                             ACPI_ROOT_OBJECT,
973                             ACPI_UINT32_MAX,
974                             processor_walk_namespace_cb, &action, NULL);
975 #endif
976 }
977
978 static
979 void acpi_processor_uninstall_hotplug_notify(void)
980 {
981 #ifdef CONFIG_ACPI_HOTPLUG_CPU
982         int action = UNINSTALL_NOTIFY_HANDLER;
983         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
984                             ACPI_ROOT_OBJECT,
985                             ACPI_UINT32_MAX,
986                             processor_walk_namespace_cb, &action, NULL);
987 #endif
988 }
989
990 /*
991  * We keep the driver loaded even when ACPI is not running.
992  * This is needed for the powernow-k8 driver, that works even without
993  * ACPI, but needs symbols from this driver
994  */
995
996 static int __init acpi_processor_init(void)
997 {
998         int result = 0;
999
1000
1001         memset(&processors, 0, sizeof(processors));
1002         memset(&errata, 0, sizeof(errata));
1003
1004 #ifdef CONFIG_SMP
1005         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1006                                 (struct acpi_table_header **)&madt)))
1007                 madt = 0;
1008 #endif
1009
1010         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1011         if (!acpi_processor_dir)
1012                 return -ENOMEM;
1013         acpi_processor_dir->owner = THIS_MODULE;
1014
1015         result = acpi_bus_register_driver(&acpi_processor_driver);
1016         if (result < 0) {
1017                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1018                 return result;
1019         }
1020
1021         acpi_processor_install_hotplug_notify();
1022
1023         acpi_thermal_cpufreq_init();
1024
1025         acpi_processor_ppc_init();
1026
1027         return 0;
1028 }
1029
1030 static void __exit acpi_processor_exit(void)
1031 {
1032
1033         acpi_processor_ppc_exit();
1034
1035         acpi_thermal_cpufreq_exit();
1036
1037         acpi_processor_uninstall_hotplug_notify();
1038
1039         acpi_bus_unregister_driver(&acpi_processor_driver);
1040
1041         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1042
1043         return;
1044 }
1045
1046 module_init(acpi_processor_init);
1047 module_exit(acpi_processor_exit);
1048
1049 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1050
1051 MODULE_ALIAS("processor");