ACPI: disable lower idle C-states across suspend/resume
[sfrench/cifs-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 const struct acpi_device_id processor_device_ids[] = {
92         {ACPI_PROCESSOR_HID, 0},
93         {"", 0},
94 };
95 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
96
97 static struct acpi_driver acpi_processor_driver = {
98         .name = "processor",
99         .class = ACPI_PROCESSOR_CLASS,
100         .ids = processor_device_ids,
101         .ops = {
102                 .add = acpi_processor_add,
103                 .remove = acpi_processor_remove,
104                 .start = acpi_processor_start,
105                 .suspend = acpi_processor_suspend,
106                 .resume = acpi_processor_resume,
107                 },
108 };
109
110 #define INSTALL_NOTIFY_HANDLER          1
111 #define UNINSTALL_NOTIFY_HANDLER        2
112
113 static const struct file_operations acpi_processor_info_fops = {
114         .open = acpi_processor_info_open_fs,
115         .read = seq_read,
116         .llseek = seq_lseek,
117         .release = single_release,
118 };
119
120 struct acpi_processor *processors[NR_CPUS];
121 struct acpi_processor_errata errata __read_mostly;
122
123 /* --------------------------------------------------------------------------
124                                 Errata Handling
125    -------------------------------------------------------------------------- */
126
127 static int acpi_processor_errata_piix4(struct pci_dev *dev)
128 {
129         u8 value1 = 0;
130         u8 value2 = 0;
131
132
133         if (!dev)
134                 return -EINVAL;
135
136         /*
137          * Note that 'dev' references the PIIX4 ACPI Controller.
138          */
139
140         switch (dev->revision) {
141         case 0:
142                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
143                 break;
144         case 1:
145                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
146                 break;
147         case 2:
148                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
149                 break;
150         case 3:
151                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
152                 break;
153         default:
154                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
155                 break;
156         }
157
158         switch (dev->revision) {
159
160         case 0:         /* PIIX4 A-step */
161         case 1:         /* PIIX4 B-step */
162                 /*
163                  * See specification changes #13 ("Manual Throttle Duty Cycle")
164                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
165                  * erratum #5 ("STPCLK# Deassertion Time") from the January
166                  * 2002 PIIX4 specification update.  Applies to only older
167                  * PIIX4 models.
168                  */
169                 errata.piix4.throttle = 1;
170
171         case 2:         /* PIIX4E */
172         case 3:         /* PIIX4M */
173                 /*
174                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
175                  * Livelock") from the January 2002 PIIX4 specification update.
176                  * Applies to all PIIX4 models.
177                  */
178
179                 /*
180                  * BM-IDE
181                  * ------
182                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
183                  * Status register address.  We'll use this later to read
184                  * each IDE controller's DMA status to make sure we catch all
185                  * DMA activity.
186                  */
187                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
188                                      PCI_DEVICE_ID_INTEL_82371AB,
189                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
190                 if (dev) {
191                         errata.piix4.bmisx = pci_resource_start(dev, 4);
192                         pci_dev_put(dev);
193                 }
194
195                 /*
196                  * Type-F DMA
197                  * ----------
198                  * Find the PIIX4 ISA Controller and read the Motherboard
199                  * DMA controller's status to see if Type-F (Fast) DMA mode
200                  * is enabled (bit 7) on either channel.  Note that we'll
201                  * disable C3 support if this is enabled, as some legacy
202                  * devices won't operate well if fast DMA is disabled.
203                  */
204                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
205                                      PCI_DEVICE_ID_INTEL_82371AB_0,
206                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
207                 if (dev) {
208                         pci_read_config_byte(dev, 0x76, &value1);
209                         pci_read_config_byte(dev, 0x77, &value2);
210                         if ((value1 & 0x80) || (value2 & 0x80))
211                                 errata.piix4.fdma = 1;
212                         pci_dev_put(dev);
213                 }
214
215                 break;
216         }
217
218         if (errata.piix4.bmisx)
219                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
220                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
221         if (errata.piix4.fdma)
222                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
223                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
224
225         return 0;
226 }
227
228 static int acpi_processor_errata(struct acpi_processor *pr)
229 {
230         int result = 0;
231         struct pci_dev *dev = NULL;
232
233
234         if (!pr)
235                 return -EINVAL;
236
237         /*
238          * PIIX4
239          */
240         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
241                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
242                              PCI_ANY_ID, NULL);
243         if (dev) {
244                 result = acpi_processor_errata_piix4(dev);
245                 pci_dev_put(dev);
246         }
247
248         return result;
249 }
250
251 /* --------------------------------------------------------------------------
252                               Common ACPI processor functions
253    -------------------------------------------------------------------------- */
254
255 /*
256  * _PDC is required for a BIOS-OS handshake for most of the newer
257  * ACPI processor features.
258  */
259 static int acpi_processor_set_pdc(struct acpi_processor *pr)
260 {
261         struct acpi_object_list *pdc_in = pr->pdc;
262         acpi_status status = AE_OK;
263
264
265         if (!pdc_in)
266                 return status;
267
268         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
269
270         if (ACPI_FAILURE(status))
271                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
272                     "Could not evaluate _PDC, using legacy perf. control...\n"));
273
274         return status;
275 }
276
277 /* --------------------------------------------------------------------------
278                               FS Interface (/proc)
279    -------------------------------------------------------------------------- */
280
281 static struct proc_dir_entry *acpi_processor_dir = NULL;
282
283 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
284 {
285         struct acpi_processor *pr = seq->private;
286
287
288         if (!pr)
289                 goto end;
290
291         seq_printf(seq, "processor id:            %d\n"
292                    "acpi id:                 %d\n"
293                    "bus mastering control:   %s\n"
294                    "power management:        %s\n"
295                    "throttling control:      %s\n"
296                    "limit interface:         %s\n",
297                    pr->id,
298                    pr->acpi_id,
299                    pr->flags.bm_control ? "yes" : "no",
300                    pr->flags.power ? "yes" : "no",
301                    pr->flags.throttling ? "yes" : "no",
302                    pr->flags.limit ? "yes" : "no");
303
304       end:
305         return 0;
306 }
307
308 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
309 {
310         return single_open(file, acpi_processor_info_seq_show,
311                            PDE(inode)->data);
312 }
313
314 static int acpi_processor_add_fs(struct acpi_device *device)
315 {
316         struct proc_dir_entry *entry = NULL;
317
318
319         if (!acpi_device_dir(device)) {
320                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
321                                                      acpi_processor_dir);
322                 if (!acpi_device_dir(device))
323                         return -ENODEV;
324         }
325         acpi_device_dir(device)->owner = THIS_MODULE;
326
327         /* 'info' [R] */
328         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
329                                   S_IRUGO, acpi_device_dir(device));
330         if (!entry)
331                 return -EIO;
332         else {
333                 entry->proc_fops = &acpi_processor_info_fops;
334                 entry->data = acpi_driver_data(device);
335                 entry->owner = THIS_MODULE;
336         }
337
338         /* 'throttling' [R/W] */
339         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
340                                   S_IFREG | S_IRUGO | S_IWUSR,
341                                   acpi_device_dir(device));
342         if (!entry)
343                 return -EIO;
344         else {
345                 entry->proc_fops = &acpi_processor_throttling_fops;
346                 entry->data = acpi_driver_data(device);
347                 entry->owner = THIS_MODULE;
348         }
349
350         /* 'limit' [R/W] */
351         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
352                                   S_IFREG | S_IRUGO | S_IWUSR,
353                                   acpi_device_dir(device));
354         if (!entry)
355                 return -EIO;
356         else {
357                 entry->proc_fops = &acpi_processor_limit_fops;
358                 entry->data = acpi_driver_data(device);
359                 entry->owner = THIS_MODULE;
360         }
361
362         return 0;
363 }
364
365 static int acpi_processor_remove_fs(struct acpi_device *device)
366 {
367
368         if (acpi_device_dir(device)) {
369                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
370                                   acpi_device_dir(device));
371                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
372                                   acpi_device_dir(device));
373                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
374                                   acpi_device_dir(device));
375                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
376                 acpi_device_dir(device) = NULL;
377         }
378
379         return 0;
380 }
381
382 /* Use the acpiid in MADT to map cpus in case of SMP */
383
384 #ifndef CONFIG_SMP
385 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
386 #else
387
388 static struct acpi_table_madt *madt;
389
390 static int map_lapic_id(struct acpi_subtable_header *entry,
391                  u32 acpi_id, int *apic_id)
392 {
393         struct acpi_madt_local_apic *lapic =
394                 (struct acpi_madt_local_apic *)entry;
395         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
396             lapic->processor_id == acpi_id) {
397                 *apic_id = lapic->id;
398                 return 1;
399         }
400         return 0;
401 }
402
403 static int map_lsapic_id(struct acpi_subtable_header *entry,
404                   u32 acpi_id, int *apic_id)
405 {
406         struct acpi_madt_local_sapic *lsapic =
407                 (struct acpi_madt_local_sapic *)entry;
408         /* Only check enabled APICs*/
409         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
410                 /* First check against id */
411                 if (lsapic->processor_id == acpi_id) {
412                         *apic_id = (lsapic->id << 8) | lsapic->eid;
413                         return 1;
414                 /* Check against optional uid */
415                 } else if (entry->length >= 16 &&
416                         lsapic->uid == acpi_id) {
417                         *apic_id = lsapic->uid;
418                         return 1;
419                 }
420         }
421         return 0;
422 }
423
424 #ifdef CONFIG_IA64
425 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
426 #else
427 #define arch_cpu_to_apicid      x86_cpu_to_apicid
428 #endif
429
430 static int map_madt_entry(u32 acpi_id)
431 {
432         unsigned long madt_end, entry;
433         int apic_id = -1;
434
435         if (!madt)
436                 return apic_id;
437
438         entry = (unsigned long)madt;
439         madt_end = entry + madt->header.length;
440
441         /* Parse all entries looking for a match. */
442
443         entry += sizeof(struct acpi_table_madt);
444         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
445                 struct acpi_subtable_header *header =
446                         (struct acpi_subtable_header *)entry;
447                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
448                         if (map_lapic_id(header, acpi_id, &apic_id))
449                                 break;
450                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
451                         if (map_lsapic_id(header, acpi_id, &apic_id))
452                                 break;
453                 }
454                 entry += header->length;
455         }
456         return apic_id;
457 }
458
459 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
460 {
461         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
462         union acpi_object *obj;
463         struct acpi_subtable_header *header;
464         int apic_id = -1;
465
466         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
467                 goto exit;
468
469         if (!buffer.length || !buffer.pointer)
470                 goto exit;
471
472         obj = buffer.pointer;
473         if (obj->type != ACPI_TYPE_BUFFER ||
474             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
475                 goto exit;
476         }
477
478         header = (struct acpi_subtable_header *)obj->buffer.pointer;
479         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
480                 map_lapic_id(header, acpi_id, &apic_id);
481         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
482                 map_lsapic_id(header, acpi_id, &apic_id);
483         }
484
485 exit:
486         if (buffer.pointer)
487                 kfree(buffer.pointer);
488         return apic_id;
489 }
490
491 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
492 {
493         int i;
494         int apic_id = -1;
495
496         apic_id = map_mat_entry(handle, acpi_id);
497         if (apic_id == -1)
498                 apic_id = map_madt_entry(acpi_id);
499         if (apic_id == -1)
500                 return apic_id;
501
502         for (i = 0; i < NR_CPUS; ++i) {
503                 if (arch_cpu_to_apicid[i] == apic_id)
504                         return i;
505         }
506         return -1;
507 }
508 #endif
509
510 /* --------------------------------------------------------------------------
511                                  Driver Interface
512    -------------------------------------------------------------------------- */
513
514 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
515 {
516         acpi_status status = 0;
517         union acpi_object object = { 0 };
518         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
519         int cpu_index;
520         static int cpu0_initialized;
521
522
523         if (!pr)
524                 return -EINVAL;
525
526         if (num_online_cpus() > 1)
527                 errata.smp = TRUE;
528
529         acpi_processor_errata(pr);
530
531         /*
532          * Check to see if we have bus mastering arbitration control.  This
533          * is required for proper C3 usage (to maintain cache coherency).
534          */
535         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
536                 pr->flags.bm_control = 1;
537                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
538                                   "Bus mastering arbitration control present\n"));
539         } else
540                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
541                                   "No bus mastering arbitration control\n"));
542
543         /* Check if it is a Device with HID and UID */
544         if (has_uid) {
545                 unsigned long value;
546                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
547                                                 NULL, &value);
548                 if (ACPI_FAILURE(status)) {
549                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
550                         return -ENODEV;
551                 }
552                 pr->acpi_id = value;
553         } else {
554                 /*
555                 * Evalute the processor object.  Note that it is common on SMP to
556                 * have the first (boot) processor with a valid PBLK address while
557                 * all others have a NULL address.
558                 */
559                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
560                 if (ACPI_FAILURE(status)) {
561                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
562                         return -ENODEV;
563                 }
564
565                 /*
566                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
567                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
568                 */
569                 pr->acpi_id = object.processor.proc_id;
570         }
571         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
572
573         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
574         if (!cpu0_initialized && (cpu_index == -1) &&
575             (num_online_cpus() == 1)) {
576                 cpu_index = 0;
577         }
578
579         cpu0_initialized = 1;
580
581         pr->id = cpu_index;
582
583         /*
584          *  Extra Processor objects may be enumerated on MP systems with
585          *  less than the max # of CPUs. They should be ignored _iff
586          *  they are physically not present.
587          */
588         if (pr->id == -1) {
589                 if (ACPI_FAILURE
590                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
591                         return -ENODEV;
592                 }
593         }
594
595         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
596                           pr->acpi_id));
597
598         if (!object.processor.pblk_address)
599                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
600         else if (object.processor.pblk_length != 6)
601                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
602                             object.processor.pblk_length);
603         else {
604                 pr->throttling.address = object.processor.pblk_address;
605                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
606                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
607
608                 pr->pblk = object.processor.pblk_address;
609
610                 /*
611                  * We don't care about error returns - we just try to mark
612                  * these reserved so that nobody else is confused into thinking
613                  * that this region might be unused..
614                  *
615                  * (In particular, allocating the IO range for Cardbus)
616                  */
617                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
618         }
619
620 #ifdef CONFIG_CPU_FREQ
621         acpi_processor_ppc_has_changed(pr);
622 #endif
623         acpi_processor_get_throttling_info(pr);
624         acpi_processor_get_limit_info(pr);
625
626         return 0;
627 }
628
629 static void *processor_device_array[NR_CPUS];
630
631 static int __cpuinit acpi_processor_start(struct acpi_device *device)
632 {
633         int result = 0;
634         acpi_status status = AE_OK;
635         struct acpi_processor *pr;
636
637
638         pr = acpi_driver_data(device);
639
640         result = acpi_processor_get_info(pr, device->flags.unique_id);
641         if (result) {
642                 /* Processor is physically not present */
643                 return 0;
644         }
645
646         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
647
648         /*
649          * Buggy BIOS check
650          * ACPI id of processors can be reported wrongly by the BIOS.
651          * Don't trust it blindly
652          */
653         if (processor_device_array[pr->id] != NULL &&
654             processor_device_array[pr->id] != device) {
655                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
656                         "for the processor\n");
657                 return -ENODEV;
658         }
659         processor_device_array[pr->id] = device;
660
661         processors[pr->id] = pr;
662
663         result = acpi_processor_add_fs(device);
664         if (result)
665                 goto end;
666
667         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
668                                              acpi_processor_notify, pr);
669
670         /* _PDC call should be done before doing anything else (if reqd.). */
671         arch_acpi_processor_init_pdc(pr);
672         acpi_processor_set_pdc(pr);
673
674         acpi_processor_power_init(pr, device);
675
676         if (pr->flags.throttling) {
677                 printk(KERN_INFO PREFIX "%s [%s] (supports",
678                        acpi_device_name(device), acpi_device_bid(device));
679                 printk(" %d throttling states", pr->throttling.state_count);
680                 printk(")\n");
681         }
682
683       end:
684
685         return result;
686 }
687
688 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
689 {
690         struct acpi_processor *pr = data;
691         struct acpi_device *device = NULL;
692
693
694         if (!pr)
695                 return;
696
697         if (acpi_bus_get_device(pr->handle, &device))
698                 return;
699
700         switch (event) {
701         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
702                 acpi_processor_ppc_has_changed(pr);
703                 acpi_bus_generate_proc_event(device, event,
704                                         pr->performance_platform_limit);
705                 acpi_bus_generate_netlink_event(device->pnp.device_class,
706                                                   device->dev.bus_id, event,
707                                                   pr->performance_platform_limit);
708                 break;
709         case ACPI_PROCESSOR_NOTIFY_POWER:
710                 acpi_processor_cst_has_changed(pr);
711                 acpi_bus_generate_proc_event(device, event, 0);
712                 acpi_bus_generate_netlink_event(device->pnp.device_class,
713                                                   device->dev.bus_id, event, 0);
714                 break;
715         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
716                 acpi_processor_tstate_has_changed(pr);
717                 acpi_bus_generate_proc_event(device, event, 0);
718                 acpi_bus_generate_netlink_event(device->pnp.device_class,
719                                                   device->dev.bus_id, event, 0);
720         default:
721                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
722                                   "Unsupported event [0x%x]\n", event));
723                 break;
724         }
725
726         return;
727 }
728
729 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
730                 unsigned long action, void *hcpu)
731 {
732         unsigned int cpu = (unsigned long)hcpu;
733         struct acpi_processor *pr = processors[cpu];
734
735         if (action == CPU_ONLINE && pr) {
736                 acpi_processor_ppc_has_changed(pr);
737                 acpi_processor_cst_has_changed(pr);
738                 acpi_processor_tstate_has_changed(pr);
739         }
740         return NOTIFY_OK;
741 }
742
743 static struct notifier_block acpi_cpu_notifier =
744 {
745             .notifier_call = acpi_cpu_soft_notify,
746 };
747
748 static int acpi_processor_add(struct acpi_device *device)
749 {
750         struct acpi_processor *pr = NULL;
751
752
753         if (!device)
754                 return -EINVAL;
755
756         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
757         if (!pr)
758                 return -ENOMEM;
759
760         pr->handle = device->handle;
761         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
762         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
763         acpi_driver_data(device) = pr;
764
765         return 0;
766 }
767
768 static int acpi_processor_remove(struct acpi_device *device, int type)
769 {
770         acpi_status status = AE_OK;
771         struct acpi_processor *pr = NULL;
772
773
774         if (!device || !acpi_driver_data(device))
775                 return -EINVAL;
776
777         pr = acpi_driver_data(device);
778
779         if (pr->id >= NR_CPUS) {
780                 kfree(pr);
781                 return 0;
782         }
783
784         if (type == ACPI_BUS_REMOVAL_EJECT) {
785                 if (acpi_processor_handle_eject(pr))
786                         return -EINVAL;
787         }
788
789         acpi_processor_power_exit(pr, device);
790
791         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
792                                             acpi_processor_notify);
793
794         acpi_processor_remove_fs(device);
795
796         processors[pr->id] = NULL;
797
798         kfree(pr);
799
800         return 0;
801 }
802
803 #ifdef CONFIG_ACPI_HOTPLUG_CPU
804 /****************************************************************************
805  *      Acpi processor hotplug support                                      *
806  ****************************************************************************/
807
808 static int is_processor_present(acpi_handle handle);
809
810 static int is_processor_present(acpi_handle handle)
811 {
812         acpi_status status;
813         unsigned long sta = 0;
814
815
816         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
817         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
818                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
819                 return 0;
820         }
821         return 1;
822 }
823
824 static
825 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
826 {
827         acpi_handle phandle;
828         struct acpi_device *pdev;
829         struct acpi_processor *pr;
830
831
832         if (acpi_get_parent(handle, &phandle)) {
833                 return -ENODEV;
834         }
835
836         if (acpi_bus_get_device(phandle, &pdev)) {
837                 return -ENODEV;
838         }
839
840         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
841                 return -ENODEV;
842         }
843
844         acpi_bus_start(*device);
845
846         pr = acpi_driver_data(*device);
847         if (!pr)
848                 return -ENODEV;
849
850         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
851                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
852         }
853         return 0;
854 }
855
856 static void
857 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
858 {
859         struct acpi_processor *pr;
860         struct acpi_device *device = NULL;
861         int result;
862
863
864         switch (event) {
865         case ACPI_NOTIFY_BUS_CHECK:
866         case ACPI_NOTIFY_DEVICE_CHECK:
867                 printk("Processor driver received %s event\n",
868                        (event == ACPI_NOTIFY_BUS_CHECK) ?
869                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
870
871                 if (!is_processor_present(handle))
872                         break;
873
874                 if (acpi_bus_get_device(handle, &device)) {
875                         result = acpi_processor_device_add(handle, &device);
876                         if (result)
877                                 printk(KERN_ERR PREFIX
878                                             "Unable to add the device\n");
879                         break;
880                 }
881
882                 pr = acpi_driver_data(device);
883                 if (!pr) {
884                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
885                         break;
886                 }
887
888                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
889                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
890                         break;
891                 }
892
893                 result = acpi_processor_start(device);
894                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
895                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
896                 } else {
897                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
898                                     acpi_device_bid(device));
899                 }
900                 break;
901         case ACPI_NOTIFY_EJECT_REQUEST:
902                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
903                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
904
905                 if (acpi_bus_get_device(handle, &device)) {
906                         printk(KERN_ERR PREFIX
907                                     "Device don't exist, dropping EJECT\n");
908                         break;
909                 }
910                 pr = acpi_driver_data(device);
911                 if (!pr) {
912                         printk(KERN_ERR PREFIX
913                                     "Driver data is NULL, dropping EJECT\n");
914                         return;
915                 }
916
917                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
918                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
919                 break;
920         default:
921                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
922                                   "Unsupported event [0x%x]\n", event));
923                 break;
924         }
925
926         return;
927 }
928
929 static acpi_status
930 processor_walk_namespace_cb(acpi_handle handle,
931                             u32 lvl, void *context, void **rv)
932 {
933         acpi_status status;
934         int *action = context;
935         acpi_object_type type = 0;
936
937         status = acpi_get_type(handle, &type);
938         if (ACPI_FAILURE(status))
939                 return (AE_OK);
940
941         if (type != ACPI_TYPE_PROCESSOR)
942                 return (AE_OK);
943
944         switch (*action) {
945         case INSTALL_NOTIFY_HANDLER:
946                 acpi_install_notify_handler(handle,
947                                             ACPI_SYSTEM_NOTIFY,
948                                             acpi_processor_hotplug_notify,
949                                             NULL);
950                 break;
951         case UNINSTALL_NOTIFY_HANDLER:
952                 acpi_remove_notify_handler(handle,
953                                            ACPI_SYSTEM_NOTIFY,
954                                            acpi_processor_hotplug_notify);
955                 break;
956         default:
957                 break;
958         }
959
960         return (AE_OK);
961 }
962
963 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
964 {
965
966         if (!is_processor_present(handle)) {
967                 return AE_ERROR;
968         }
969
970         if (acpi_map_lsapic(handle, p_cpu))
971                 return AE_ERROR;
972
973         if (arch_register_cpu(*p_cpu)) {
974                 acpi_unmap_lsapic(*p_cpu);
975                 return AE_ERROR;
976         }
977
978         return AE_OK;
979 }
980
981 static int acpi_processor_handle_eject(struct acpi_processor *pr)
982 {
983         if (cpu_online(pr->id)) {
984                 return (-EINVAL);
985         }
986         arch_unregister_cpu(pr->id);
987         acpi_unmap_lsapic(pr->id);
988         return (0);
989 }
990 #else
991 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
992 {
993         return AE_ERROR;
994 }
995 static int acpi_processor_handle_eject(struct acpi_processor *pr)
996 {
997         return (-EINVAL);
998 }
999 #endif
1000
1001 static
1002 void acpi_processor_install_hotplug_notify(void)
1003 {
1004 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1005         int action = INSTALL_NOTIFY_HANDLER;
1006         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1007                             ACPI_ROOT_OBJECT,
1008                             ACPI_UINT32_MAX,
1009                             processor_walk_namespace_cb, &action, NULL);
1010 #endif
1011         register_hotcpu_notifier(&acpi_cpu_notifier);
1012 }
1013
1014 static
1015 void acpi_processor_uninstall_hotplug_notify(void)
1016 {
1017 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1018         int action = UNINSTALL_NOTIFY_HANDLER;
1019         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1020                             ACPI_ROOT_OBJECT,
1021                             ACPI_UINT32_MAX,
1022                             processor_walk_namespace_cb, &action, NULL);
1023 #endif
1024         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1025 }
1026
1027 /*
1028  * We keep the driver loaded even when ACPI is not running.
1029  * This is needed for the powernow-k8 driver, that works even without
1030  * ACPI, but needs symbols from this driver
1031  */
1032
1033 static int __init acpi_processor_init(void)
1034 {
1035         int result = 0;
1036
1037
1038         memset(&processors, 0, sizeof(processors));
1039         memset(&errata, 0, sizeof(errata));
1040
1041 #ifdef CONFIG_SMP
1042         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1043                                 (struct acpi_table_header **)&madt)))
1044                 madt = NULL;
1045 #endif
1046
1047         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1048         if (!acpi_processor_dir)
1049                 return -ENOMEM;
1050         acpi_processor_dir->owner = THIS_MODULE;
1051
1052         result = acpi_bus_register_driver(&acpi_processor_driver);
1053         if (result < 0) {
1054                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1055                 return result;
1056         }
1057
1058         acpi_processor_install_hotplug_notify();
1059
1060         acpi_thermal_cpufreq_init();
1061
1062         acpi_processor_ppc_init();
1063
1064         return 0;
1065 }
1066
1067 static void __exit acpi_processor_exit(void)
1068 {
1069
1070         acpi_processor_ppc_exit();
1071
1072         acpi_thermal_cpufreq_exit();
1073
1074         acpi_processor_uninstall_hotplug_notify();
1075
1076         acpi_bus_unregister_driver(&acpi_processor_driver);
1077
1078         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1079
1080         return;
1081 }
1082
1083 module_init(acpi_processor_init);
1084 module_exit(acpi_processor_exit);
1085
1086 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1087
1088 MODULE_ALIAS("processor");