create sysfs link from acpi device to sysdev for cpu
[linux-2.6.git] / drivers / acpi / processor_core.c
1 /*
2  * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
7  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8  *                      - Added processor hotplug support
9  *
10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11  *
12  *  This program is free software; you can redistribute it and/or modify
13  *  it under the terms of the GNU General Public License as published by
14  *  the Free Software Foundation; either version 2 of the License, or (at
15  *  your option) any later version.
16  *
17  *  This program is distributed in the hope that it will be useful, but
18  *  WITHOUT ANY WARRANTY; without even the implied warranty of
19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
20  *  General Public License for more details.
21  *
22  *  You should have received a copy of the GNU General Public License along
23  *  with this program; if not, write to the Free Software Foundation, Inc.,
24  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25  *
26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27  *  TBD:
28  *      1. Make # power states dynamic.
29  *      2. Support duty_cycle values that span bit 4.
30  *      3. Optimize by having scheduler determine business instead of
31  *         having us try to calculate it here.
32  *      4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
33  */
34
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/types.h>
39 #include <linux/pci.h>
40 #include <linux/pm.h>
41 #include <linux/cpufreq.h>
42 #include <linux/cpu.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/dmi.h>
46 #include <linux/moduleparam.h>
47 #include <linux/cpuidle.h>
48
49 #include <asm/io.h>
50 #include <asm/system.h>
51 #include <asm/cpu.h>
52 #include <asm/delay.h>
53 #include <asm/uaccess.h>
54 #include <asm/processor.h>
55 #include <asm/smp.h>
56 #include <asm/acpi.h>
57
58 #include <acpi/acpi_bus.h>
59 #include <acpi/acpi_drivers.h>
60 #include <acpi/processor.h>
61
62 #define ACPI_PROCESSOR_COMPONENT        0x01000000
63 #define ACPI_PROCESSOR_CLASS            "processor"
64 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
65 #define ACPI_PROCESSOR_FILE_INFO        "info"
66 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
67 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
69 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
70 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
71
72 #define ACPI_PROCESSOR_LIMIT_USER       0
73 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
74
75 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
76 ACPI_MODULE_NAME("processor_core");
77
78 MODULE_AUTHOR("Paul Diefenbaugh");
79 MODULE_DESCRIPTION("ACPI Processor Driver");
80 MODULE_LICENSE("GPL");
81
82 static int acpi_processor_add(struct acpi_device *device);
83 static int acpi_processor_start(struct acpi_device *device);
84 static int acpi_processor_remove(struct acpi_device *device, int type);
85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
86 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
87 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
88 static int acpi_processor_handle_eject(struct acpi_processor *pr);
89
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         .owner = THIS_MODULE,
115         .open = acpi_processor_info_open_fs,
116         .read = seq_read,
117         .llseek = seq_lseek,
118         .release = single_release,
119 };
120
121 struct acpi_processor *processors[NR_CPUS];
122 struct acpi_processor_errata errata __read_mostly;
123
124 /* --------------------------------------------------------------------------
125                                 Errata Handling
126    -------------------------------------------------------------------------- */
127
128 static int acpi_processor_errata_piix4(struct pci_dev *dev)
129 {
130         u8 value1 = 0;
131         u8 value2 = 0;
132
133
134         if (!dev)
135                 return -EINVAL;
136
137         /*
138          * Note that 'dev' references the PIIX4 ACPI Controller.
139          */
140
141         switch (dev->revision) {
142         case 0:
143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
144                 break;
145         case 1:
146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
147                 break;
148         case 2:
149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
150                 break;
151         case 3:
152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
153                 break;
154         default:
155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
156                 break;
157         }
158
159         switch (dev->revision) {
160
161         case 0:         /* PIIX4 A-step */
162         case 1:         /* PIIX4 B-step */
163                 /*
164                  * See specification changes #13 ("Manual Throttle Duty Cycle")
165                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
166                  * erratum #5 ("STPCLK# Deassertion Time") from the January
167                  * 2002 PIIX4 specification update.  Applies to only older
168                  * PIIX4 models.
169                  */
170                 errata.piix4.throttle = 1;
171
172         case 2:         /* PIIX4E */
173         case 3:         /* PIIX4M */
174                 /*
175                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
176                  * Livelock") from the January 2002 PIIX4 specification update.
177                  * Applies to all PIIX4 models.
178                  */
179
180                 /*
181                  * BM-IDE
182                  * ------
183                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
184                  * Status register address.  We'll use this later to read
185                  * each IDE controller's DMA status to make sure we catch all
186                  * DMA activity.
187                  */
188                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
189                                      PCI_DEVICE_ID_INTEL_82371AB,
190                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
191                 if (dev) {
192                         errata.piix4.bmisx = pci_resource_start(dev, 4);
193                         pci_dev_put(dev);
194                 }
195
196                 /*
197                  * Type-F DMA
198                  * ----------
199                  * Find the PIIX4 ISA Controller and read the Motherboard
200                  * DMA controller's status to see if Type-F (Fast) DMA mode
201                  * is enabled (bit 7) on either channel.  Note that we'll
202                  * disable C3 support if this is enabled, as some legacy
203                  * devices won't operate well if fast DMA is disabled.
204                  */
205                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
206                                      PCI_DEVICE_ID_INTEL_82371AB_0,
207                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
208                 if (dev) {
209                         pci_read_config_byte(dev, 0x76, &value1);
210                         pci_read_config_byte(dev, 0x77, &value2);
211                         if ((value1 & 0x80) || (value2 & 0x80))
212                                 errata.piix4.fdma = 1;
213                         pci_dev_put(dev);
214                 }
215
216                 break;
217         }
218
219         if (errata.piix4.bmisx)
220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
221                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
222         if (errata.piix4.fdma)
223                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
224                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
225
226         return 0;
227 }
228
229 static int acpi_processor_errata(struct acpi_processor *pr)
230 {
231         int result = 0;
232         struct pci_dev *dev = NULL;
233
234
235         if (!pr)
236                 return -EINVAL;
237
238         /*
239          * PIIX4
240          */
241         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
242                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
243                              PCI_ANY_ID, NULL);
244         if (dev) {
245                 result = acpi_processor_errata_piix4(dev);
246                 pci_dev_put(dev);
247         }
248
249         return result;
250 }
251
252 /* --------------------------------------------------------------------------
253                               Common ACPI processor functions
254    -------------------------------------------------------------------------- */
255
256 /*
257  * _PDC is required for a BIOS-OS handshake for most of the newer
258  * ACPI processor features.
259  */
260 static int acpi_processor_set_pdc(struct acpi_processor *pr)
261 {
262         struct acpi_object_list *pdc_in = pr->pdc;
263         acpi_status status = AE_OK;
264
265
266         if (!pdc_in)
267                 return status;
268
269         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
270
271         if (ACPI_FAILURE(status))
272                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
273                     "Could not evaluate _PDC, using legacy perf. control...\n"));
274
275         return status;
276 }
277
278 /* --------------------------------------------------------------------------
279                               FS Interface (/proc)
280    -------------------------------------------------------------------------- */
281
282 static struct proc_dir_entry *acpi_processor_dir = NULL;
283
284 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
285 {
286         struct acpi_processor *pr = seq->private;
287
288
289         if (!pr)
290                 goto end;
291
292         seq_printf(seq, "processor id:            %d\n"
293                    "acpi id:                 %d\n"
294                    "bus mastering control:   %s\n"
295                    "power management:        %s\n"
296                    "throttling control:      %s\n"
297                    "limit interface:         %s\n",
298                    pr->id,
299                    pr->acpi_id,
300                    pr->flags.bm_control ? "yes" : "no",
301                    pr->flags.power ? "yes" : "no",
302                    pr->flags.throttling ? "yes" : "no",
303                    pr->flags.limit ? "yes" : "no");
304
305       end:
306         return 0;
307 }
308
309 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
310 {
311         return single_open(file, acpi_processor_info_seq_show,
312                            PDE(inode)->data);
313 }
314
315 static int acpi_processor_add_fs(struct acpi_device *device)
316 {
317         struct proc_dir_entry *entry = NULL;
318
319
320         if (!acpi_device_dir(device)) {
321                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
322                                                      acpi_processor_dir);
323                 if (!acpi_device_dir(device))
324                         return -ENODEV;
325         }
326         acpi_device_dir(device)->owner = THIS_MODULE;
327
328         /* 'info' [R] */
329         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
330                                  S_IRUGO, acpi_device_dir(device),
331                                  &acpi_processor_info_fops,
332                                  acpi_driver_data(device));
333         if (!entry)
334                 return -EIO;
335
336         /* 'throttling' [R/W] */
337         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
338                                  S_IFREG | S_IRUGO | S_IWUSR,
339                                  acpi_device_dir(device),
340                                  &acpi_processor_throttling_fops,
341                                  acpi_driver_data(device));
342         if (!entry)
343                 return -EIO;
344
345         /* 'limit' [R/W] */
346         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
347                                  S_IFREG | S_IRUGO | S_IWUSR,
348                                  acpi_device_dir(device),
349                                  &acpi_processor_limit_fops,
350                                  acpi_driver_data(device));
351         if (!entry)
352                 return -EIO;
353         return 0;
354 }
355
356 static int acpi_processor_remove_fs(struct acpi_device *device)
357 {
358
359         if (acpi_device_dir(device)) {
360                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
361                                   acpi_device_dir(device));
362                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
363                                   acpi_device_dir(device));
364                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
365                                   acpi_device_dir(device));
366                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
367                 acpi_device_dir(device) = NULL;
368         }
369
370         return 0;
371 }
372
373 /* Use the acpiid in MADT to map cpus in case of SMP */
374
375 #ifndef CONFIG_SMP
376 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
377 #else
378
379 static struct acpi_table_madt *madt;
380
381 static int map_lapic_id(struct acpi_subtable_header *entry,
382                  u32 acpi_id, int *apic_id)
383 {
384         struct acpi_madt_local_apic *lapic =
385                 (struct acpi_madt_local_apic *)entry;
386         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
387             lapic->processor_id == acpi_id) {
388                 *apic_id = lapic->id;
389                 return 1;
390         }
391         return 0;
392 }
393
394 static int map_lsapic_id(struct acpi_subtable_header *entry,
395                   u32 acpi_id, int *apic_id)
396 {
397         struct acpi_madt_local_sapic *lsapic =
398                 (struct acpi_madt_local_sapic *)entry;
399         /* Only check enabled APICs*/
400         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
401                 /* First check against id */
402                 if (lsapic->processor_id == acpi_id) {
403                         *apic_id = (lsapic->id << 8) | lsapic->eid;
404                         return 1;
405                 /* Check against optional uid */
406                 } else if (entry->length >= 16 &&
407                         lsapic->uid == acpi_id) {
408                         *apic_id = lsapic->uid;
409                         return 1;
410                 }
411         }
412         return 0;
413 }
414
415 static int map_madt_entry(u32 acpi_id)
416 {
417         unsigned long madt_end, entry;
418         int apic_id = -1;
419
420         if (!madt)
421                 return apic_id;
422
423         entry = (unsigned long)madt;
424         madt_end = entry + madt->header.length;
425
426         /* Parse all entries looking for a match. */
427
428         entry += sizeof(struct acpi_table_madt);
429         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
430                 struct acpi_subtable_header *header =
431                         (struct acpi_subtable_header *)entry;
432                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
433                         if (map_lapic_id(header, acpi_id, &apic_id))
434                                 break;
435                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
436                         if (map_lsapic_id(header, acpi_id, &apic_id))
437                                 break;
438                 }
439                 entry += header->length;
440         }
441         return apic_id;
442 }
443
444 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
445 {
446         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
447         union acpi_object *obj;
448         struct acpi_subtable_header *header;
449         int apic_id = -1;
450
451         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
452                 goto exit;
453
454         if (!buffer.length || !buffer.pointer)
455                 goto exit;
456
457         obj = buffer.pointer;
458         if (obj->type != ACPI_TYPE_BUFFER ||
459             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
460                 goto exit;
461         }
462
463         header = (struct acpi_subtable_header *)obj->buffer.pointer;
464         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
465                 map_lapic_id(header, acpi_id, &apic_id);
466         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
467                 map_lsapic_id(header, acpi_id, &apic_id);
468         }
469
470 exit:
471         if (buffer.pointer)
472                 kfree(buffer.pointer);
473         return apic_id;
474 }
475
476 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
477 {
478         int i;
479         int apic_id = -1;
480
481         apic_id = map_mat_entry(handle, acpi_id);
482         if (apic_id == -1)
483                 apic_id = map_madt_entry(acpi_id);
484         if (apic_id == -1)
485                 return apic_id;
486
487         for_each_possible_cpu(i) {
488                 if (cpu_physical_id(i) == apic_id)
489                         return i;
490         }
491         return -1;
492 }
493 #endif
494
495 /* --------------------------------------------------------------------------
496                                  Driver Interface
497    -------------------------------------------------------------------------- */
498
499 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
500 {
501         acpi_status status = 0;
502         union acpi_object object = { 0 };
503         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
504         int cpu_index;
505         static int cpu0_initialized;
506
507
508         if (!pr)
509                 return -EINVAL;
510
511         if (num_online_cpus() > 1)
512                 errata.smp = TRUE;
513
514         acpi_processor_errata(pr);
515
516         /*
517          * Check to see if we have bus mastering arbitration control.  This
518          * is required for proper C3 usage (to maintain cache coherency).
519          */
520         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
521                 pr->flags.bm_control = 1;
522                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
523                                   "Bus mastering arbitration control present\n"));
524         } else
525                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
526                                   "No bus mastering arbitration control\n"));
527
528         /* Check if it is a Device with HID and UID */
529         if (has_uid) {
530                 unsigned long value;
531                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
532                                                 NULL, &value);
533                 if (ACPI_FAILURE(status)) {
534                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
535                         return -ENODEV;
536                 }
537                 pr->acpi_id = value;
538         } else {
539                 /*
540                 * Evalute the processor object.  Note that it is common on SMP to
541                 * have the first (boot) processor with a valid PBLK address while
542                 * all others have a NULL address.
543                 */
544                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
545                 if (ACPI_FAILURE(status)) {
546                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
547                         return -ENODEV;
548                 }
549
550                 /*
551                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
552                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
553                 */
554                 pr->acpi_id = object.processor.proc_id;
555         }
556         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
557
558         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
559         if (!cpu0_initialized && (cpu_index == -1) &&
560             (num_online_cpus() == 1)) {
561                 cpu_index = 0;
562         }
563
564         cpu0_initialized = 1;
565
566         pr->id = cpu_index;
567
568         /*
569          *  Extra Processor objects may be enumerated on MP systems with
570          *  less than the max # of CPUs. They should be ignored _iff
571          *  they are physically not present.
572          */
573         if (pr->id == -1) {
574                 if (ACPI_FAILURE
575                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
576                         return -ENODEV;
577                 }
578         }
579
580         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
581                           pr->acpi_id));
582
583         if (!object.processor.pblk_address)
584                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
585         else if (object.processor.pblk_length != 6)
586                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
587                             object.processor.pblk_length);
588         else {
589                 pr->throttling.address = object.processor.pblk_address;
590                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
591                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
592
593                 pr->pblk = object.processor.pblk_address;
594
595                 /*
596                  * We don't care about error returns - we just try to mark
597                  * these reserved so that nobody else is confused into thinking
598                  * that this region might be unused..
599                  *
600                  * (In particular, allocating the IO range for Cardbus)
601                  */
602                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
603         }
604
605         /*
606          * If ACPI describes a slot number for this CPU, we can use it
607          * ensure we get the right value in the "physical id" field
608          * of /proc/cpuinfo
609          */
610         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
611         if (ACPI_SUCCESS(status))
612                 arch_fix_phys_package_id(pr->id, object.integer.value);
613
614         return 0;
615 }
616
617 static void *processor_device_array[NR_CPUS];
618
619 static int __cpuinit acpi_processor_start(struct acpi_device *device)
620 {
621         int result = 0;
622         acpi_status status = AE_OK;
623         struct acpi_processor *pr;
624         struct sys_device *sysdev;
625
626         pr = acpi_driver_data(device);
627
628         result = acpi_processor_get_info(pr, device->flags.unique_id);
629         if (result) {
630                 /* Processor is physically not present */
631                 return 0;
632         }
633
634         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
635
636         /*
637          * Buggy BIOS check
638          * ACPI id of processors can be reported wrongly by the BIOS.
639          * Don't trust it blindly
640          */
641         if (processor_device_array[pr->id] != NULL &&
642             processor_device_array[pr->id] != device) {
643                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
644                         "for the processor\n");
645                 return -ENODEV;
646         }
647         processor_device_array[pr->id] = device;
648
649         processors[pr->id] = pr;
650
651         result = acpi_processor_add_fs(device);
652         if (result)
653                 goto end;
654
655         sysdev = get_cpu_sysdev(pr->id);
656         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
657                 return -EFAULT;
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 #ifdef CONFIG_CPU_FREQ
666         acpi_processor_ppc_has_changed(pr);
667 #endif
668         acpi_processor_get_throttling_info(pr);
669         acpi_processor_get_limit_info(pr);
670
671
672         acpi_processor_power_init(pr, device);
673
674         pr->cdev = thermal_cooling_device_register("Processor", device,
675                                                 &processor_cooling_ops);
676         if (IS_ERR(pr->cdev)) {
677                 result = PTR_ERR(pr->cdev);
678                 goto end;
679         }
680
681         printk(KERN_INFO PREFIX
682                 "%s is registered as cooling_device%d\n",
683                 device->dev.bus_id, pr->cdev->id);
684
685         result = sysfs_create_link(&device->dev.kobj,
686                                    &pr->cdev->device.kobj,
687                                    "thermal_cooling");
688         if (result)
689                 printk(KERN_ERR PREFIX "Create sysfs link\n");
690         result = sysfs_create_link(&pr->cdev->device.kobj,
691                                    &device->dev.kobj,
692                                    "device");
693         if (result)
694                 printk(KERN_ERR PREFIX "Create sysfs link\n");
695
696         if (pr->flags.throttling) {
697                 printk(KERN_INFO PREFIX "%s [%s] (supports",
698                        acpi_device_name(device), acpi_device_bid(device));
699                 printk(" %d throttling states", pr->throttling.state_count);
700                 printk(")\n");
701         }
702
703       end:
704
705         return result;
706 }
707
708 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
709 {
710         struct acpi_processor *pr = data;
711         struct acpi_device *device = NULL;
712         int saved;
713
714         if (!pr)
715                 return;
716
717         if (acpi_bus_get_device(pr->handle, &device))
718                 return;
719
720         switch (event) {
721         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
722                 saved = pr->performance_platform_limit;
723                 acpi_processor_ppc_has_changed(pr);
724                 if (saved == pr->performance_platform_limit)
725                         break;
726                 acpi_bus_generate_proc_event(device, event,
727                                         pr->performance_platform_limit);
728                 acpi_bus_generate_netlink_event(device->pnp.device_class,
729                                                   device->dev.bus_id, event,
730                                                   pr->performance_platform_limit);
731                 break;
732         case ACPI_PROCESSOR_NOTIFY_POWER:
733                 acpi_processor_cst_has_changed(pr);
734                 acpi_bus_generate_proc_event(device, event, 0);
735                 acpi_bus_generate_netlink_event(device->pnp.device_class,
736                                                   device->dev.bus_id, event, 0);
737                 break;
738         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
739                 acpi_processor_tstate_has_changed(pr);
740                 acpi_bus_generate_proc_event(device, event, 0);
741                 acpi_bus_generate_netlink_event(device->pnp.device_class,
742                                                   device->dev.bus_id, event, 0);
743         default:
744                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
745                                   "Unsupported event [0x%x]\n", event));
746                 break;
747         }
748
749         return;
750 }
751
752 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
753                 unsigned long action, void *hcpu)
754 {
755         unsigned int cpu = (unsigned long)hcpu;
756         struct acpi_processor *pr = processors[cpu];
757
758         if (action == CPU_ONLINE && pr) {
759                 acpi_processor_ppc_has_changed(pr);
760                 acpi_processor_cst_has_changed(pr);
761                 acpi_processor_tstate_has_changed(pr);
762         }
763         return NOTIFY_OK;
764 }
765
766 static struct notifier_block acpi_cpu_notifier =
767 {
768             .notifier_call = acpi_cpu_soft_notify,
769 };
770
771 static int acpi_processor_add(struct acpi_device *device)
772 {
773         struct acpi_processor *pr = NULL;
774
775
776         if (!device)
777                 return -EINVAL;
778
779         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
780         if (!pr)
781                 return -ENOMEM;
782
783         pr->handle = device->handle;
784         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
785         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
786         acpi_driver_data(device) = pr;
787
788         return 0;
789 }
790
791 static int acpi_processor_remove(struct acpi_device *device, int type)
792 {
793         acpi_status status = AE_OK;
794         struct acpi_processor *pr = NULL;
795
796
797         if (!device || !acpi_driver_data(device))
798                 return -EINVAL;
799
800         pr = acpi_driver_data(device);
801
802         if (pr->id >= nr_cpu_ids) {
803                 kfree(pr);
804                 return 0;
805         }
806
807         if (type == ACPI_BUS_REMOVAL_EJECT) {
808                 if (acpi_processor_handle_eject(pr))
809                         return -EINVAL;
810         }
811
812         acpi_processor_power_exit(pr, device);
813
814         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
815                                             acpi_processor_notify);
816
817         sysfs_remove_link(&device->dev.kobj, "sysdev");
818
819         acpi_processor_remove_fs(device);
820
821         if (pr->cdev) {
822                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
823                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
824                 thermal_cooling_device_unregister(pr->cdev);
825                 pr->cdev = NULL;
826         }
827
828         processors[pr->id] = NULL;
829         processor_device_array[pr->id] = NULL;
830         kfree(pr);
831
832         return 0;
833 }
834
835 #ifdef CONFIG_ACPI_HOTPLUG_CPU
836 /****************************************************************************
837  *      Acpi processor hotplug support                                      *
838  ****************************************************************************/
839
840 static int is_processor_present(acpi_handle handle)
841 {
842         acpi_status status;
843         unsigned long sta = 0;
844
845
846         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
847
848         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
849                 return 1;
850
851         /*
852          * _STA is mandatory for a processor that supports hot plug
853          */
854         if (status == AE_NOT_FOUND)
855                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
856                                 "Processor does not support hot plug\n"));
857         else
858                 ACPI_EXCEPTION((AE_INFO, status,
859                                 "Processor Device is not present"));
860         return 0;
861 }
862
863 static
864 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
865 {
866         acpi_handle phandle;
867         struct acpi_device *pdev;
868         struct acpi_processor *pr;
869
870
871         if (acpi_get_parent(handle, &phandle)) {
872                 return -ENODEV;
873         }
874
875         if (acpi_bus_get_device(phandle, &pdev)) {
876                 return -ENODEV;
877         }
878
879         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
880                 return -ENODEV;
881         }
882
883         acpi_bus_start(*device);
884
885         pr = acpi_driver_data(*device);
886         if (!pr)
887                 return -ENODEV;
888
889         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
890                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
891         }
892         return 0;
893 }
894
895 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
896                                                 u32 event, void *data)
897 {
898         struct acpi_processor *pr;
899         struct acpi_device *device = NULL;
900         int result;
901
902
903         switch (event) {
904         case ACPI_NOTIFY_BUS_CHECK:
905         case ACPI_NOTIFY_DEVICE_CHECK:
906                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
907                 "Processor driver received %s event\n",
908                        (event == ACPI_NOTIFY_BUS_CHECK) ?
909                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
910
911                 if (!is_processor_present(handle))
912                         break;
913
914                 if (acpi_bus_get_device(handle, &device)) {
915                         result = acpi_processor_device_add(handle, &device);
916                         if (result)
917                                 printk(KERN_ERR PREFIX
918                                             "Unable to add the device\n");
919                         break;
920                 }
921
922                 pr = acpi_driver_data(device);
923                 if (!pr) {
924                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
925                         break;
926                 }
927
928                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
929                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
930                         break;
931                 }
932
933                 result = acpi_processor_start(device);
934                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
935                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
936                 } else {
937                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
938                                     acpi_device_bid(device));
939                 }
940                 break;
941         case ACPI_NOTIFY_EJECT_REQUEST:
942                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
943                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
944
945                 if (acpi_bus_get_device(handle, &device)) {
946                         printk(KERN_ERR PREFIX
947                                     "Device don't exist, dropping EJECT\n");
948                         break;
949                 }
950                 pr = acpi_driver_data(device);
951                 if (!pr) {
952                         printk(KERN_ERR PREFIX
953                                     "Driver data is NULL, dropping EJECT\n");
954                         return;
955                 }
956
957                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
958                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
959                 break;
960         default:
961                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
962                                   "Unsupported event [0x%x]\n", event));
963                 break;
964         }
965
966         return;
967 }
968
969 static acpi_status
970 processor_walk_namespace_cb(acpi_handle handle,
971                             u32 lvl, void *context, void **rv)
972 {
973         acpi_status status;
974         int *action = context;
975         acpi_object_type type = 0;
976
977         status = acpi_get_type(handle, &type);
978         if (ACPI_FAILURE(status))
979                 return (AE_OK);
980
981         if (type != ACPI_TYPE_PROCESSOR)
982                 return (AE_OK);
983
984         switch (*action) {
985         case INSTALL_NOTIFY_HANDLER:
986                 acpi_install_notify_handler(handle,
987                                             ACPI_SYSTEM_NOTIFY,
988                                             acpi_processor_hotplug_notify,
989                                             NULL);
990                 break;
991         case UNINSTALL_NOTIFY_HANDLER:
992                 acpi_remove_notify_handler(handle,
993                                            ACPI_SYSTEM_NOTIFY,
994                                            acpi_processor_hotplug_notify);
995                 break;
996         default:
997                 break;
998         }
999
1000         return (AE_OK);
1001 }
1002
1003 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1004 {
1005
1006         if (!is_processor_present(handle)) {
1007                 return AE_ERROR;
1008         }
1009
1010         if (acpi_map_lsapic(handle, p_cpu))
1011                 return AE_ERROR;
1012
1013         if (arch_register_cpu(*p_cpu)) {
1014                 acpi_unmap_lsapic(*p_cpu);
1015                 return AE_ERROR;
1016         }
1017
1018         return AE_OK;
1019 }
1020
1021 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1022 {
1023         if (cpu_online(pr->id))
1024                 cpu_down(pr->id);
1025
1026         arch_unregister_cpu(pr->id);
1027         acpi_unmap_lsapic(pr->id);
1028         return (0);
1029 }
1030 #else
1031 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1032 {
1033         return AE_ERROR;
1034 }
1035 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1036 {
1037         return (-EINVAL);
1038 }
1039 #endif
1040
1041 static
1042 void acpi_processor_install_hotplug_notify(void)
1043 {
1044 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1045         int action = INSTALL_NOTIFY_HANDLER;
1046         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1047                             ACPI_ROOT_OBJECT,
1048                             ACPI_UINT32_MAX,
1049                             processor_walk_namespace_cb, &action, NULL);
1050 #endif
1051         register_hotcpu_notifier(&acpi_cpu_notifier);
1052 }
1053
1054 static
1055 void acpi_processor_uninstall_hotplug_notify(void)
1056 {
1057 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1058         int action = UNINSTALL_NOTIFY_HANDLER;
1059         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1060                             ACPI_ROOT_OBJECT,
1061                             ACPI_UINT32_MAX,
1062                             processor_walk_namespace_cb, &action, NULL);
1063 #endif
1064         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1065 }
1066
1067 /*
1068  * We keep the driver loaded even when ACPI is not running.
1069  * This is needed for the powernow-k8 driver, that works even without
1070  * ACPI, but needs symbols from this driver
1071  */
1072
1073 static int __init acpi_processor_init(void)
1074 {
1075         int result = 0;
1076
1077
1078         memset(&processors, 0, sizeof(processors));
1079         memset(&errata, 0, sizeof(errata));
1080
1081 #ifdef CONFIG_SMP
1082         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1083                                 (struct acpi_table_header **)&madt)))
1084                 madt = NULL;
1085 #endif
1086
1087         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1088         if (!acpi_processor_dir)
1089                 return -ENOMEM;
1090         acpi_processor_dir->owner = THIS_MODULE;
1091
1092         result = cpuidle_register_driver(&acpi_idle_driver);
1093         if (result < 0)
1094                 goto out_proc;
1095
1096         result = acpi_bus_register_driver(&acpi_processor_driver);
1097         if (result < 0)
1098                 goto out_cpuidle;
1099
1100         acpi_processor_install_hotplug_notify();
1101
1102         acpi_thermal_cpufreq_init();
1103
1104         acpi_processor_ppc_init();
1105
1106         acpi_processor_throttling_init();
1107
1108         return 0;
1109
1110 out_cpuidle:
1111         cpuidle_unregister_driver(&acpi_idle_driver);
1112
1113 out_proc:
1114         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1115
1116         return result;
1117 }
1118
1119 static void __exit acpi_processor_exit(void)
1120 {
1121         acpi_processor_ppc_exit();
1122
1123         acpi_thermal_cpufreq_exit();
1124
1125         acpi_processor_uninstall_hotplug_notify();
1126
1127         acpi_bus_unregister_driver(&acpi_processor_driver);
1128
1129         cpuidle_unregister_driver(&acpi_idle_driver);
1130
1131         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1132
1133         return;
1134 }
1135
1136 module_init(acpi_processor_init);
1137 module_exit(acpi_processor_exit);
1138
1139 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1140
1141 MODULE_ALIAS("processor");