80bbf187a37d537948d0fa47115fa5a3091105fb
[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_DRIVER_NAME      "ACPI Processor Driver"
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
71 #define ACPI_PROCESSOR_LIMIT_USER       0
72 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
73
74 #define ACPI_STA_PRESENT 0x00000001
75
76 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
77 ACPI_MODULE_NAME("acpi_processor")
78
79     MODULE_AUTHOR("Paul Diefenbaugh");
80 MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
81 MODULE_LICENSE("GPL");
82
83 static int acpi_processor_add(struct acpi_device *device);
84 static int acpi_processor_start(struct acpi_device *device);
85 static int acpi_processor_remove(struct acpi_device *device, int type);
86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
87 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
88 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
89 static int acpi_processor_handle_eject(struct acpi_processor *pr);
90
91 static struct acpi_driver acpi_processor_driver = {
92         .name = ACPI_PROCESSOR_DRIVER_NAME,
93         .class = ACPI_PROCESSOR_CLASS,
94         .ids = ACPI_PROCESSOR_HID,
95         .ops = {
96                 .add = acpi_processor_add,
97                 .remove = acpi_processor_remove,
98                 .start = acpi_processor_start,
99                 },
100 };
101
102 #define INSTALL_NOTIFY_HANDLER          1
103 #define UNINSTALL_NOTIFY_HANDLER        2
104
105 static struct file_operations acpi_processor_info_fops = {
106         .open = acpi_processor_info_open_fs,
107         .read = seq_read,
108         .llseek = seq_lseek,
109         .release = single_release,
110 };
111
112 struct acpi_processor *processors[NR_CPUS];
113 struct acpi_processor_errata errata __read_mostly;
114
115 /* --------------------------------------------------------------------------
116                                 Errata Handling
117    -------------------------------------------------------------------------- */
118
119 static int acpi_processor_errata_piix4(struct pci_dev *dev)
120 {
121         u8 rev = 0;
122         u8 value1 = 0;
123         u8 value2 = 0;
124
125         ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4");
126
127         if (!dev)
128                 return_VALUE(-EINVAL);
129
130         /*
131          * Note that 'dev' references the PIIX4 ACPI Controller.
132          */
133
134         pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
135
136         switch (rev) {
137         case 0:
138                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
139                 break;
140         case 1:
141                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
142                 break;
143         case 2:
144                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
145                 break;
146         case 3:
147                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
148                 break;
149         default:
150                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
151                 break;
152         }
153
154         switch (rev) {
155
156         case 0:         /* PIIX4 A-step */
157         case 1:         /* PIIX4 B-step */
158                 /*
159                  * See specification changes #13 ("Manual Throttle Duty Cycle")
160                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
161                  * erratum #5 ("STPCLK# Deassertion Time") from the January
162                  * 2002 PIIX4 specification update.  Applies to only older
163                  * PIIX4 models.
164                  */
165                 errata.piix4.throttle = 1;
166
167         case 2:         /* PIIX4E */
168         case 3:         /* PIIX4M */
169                 /*
170                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
171                  * Livelock") from the January 2002 PIIX4 specification update.
172                  * Applies to all PIIX4 models.
173                  */
174
175                 /*
176                  * BM-IDE
177                  * ------
178                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
179                  * Status register address.  We'll use this later to read
180                  * each IDE controller's DMA status to make sure we catch all
181                  * DMA activity.
182                  */
183                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
184                                      PCI_DEVICE_ID_INTEL_82371AB,
185                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
186                 if (dev) {
187                         errata.piix4.bmisx = pci_resource_start(dev, 4);
188                         pci_dev_put(dev);
189                 }
190
191                 /*
192                  * Type-F DMA
193                  * ----------
194                  * Find the PIIX4 ISA Controller and read the Motherboard
195                  * DMA controller's status to see if Type-F (Fast) DMA mode
196                  * is enabled (bit 7) on either channel.  Note that we'll
197                  * disable C3 support if this is enabled, as some legacy
198                  * devices won't operate well if fast DMA is disabled.
199                  */
200                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
201                                      PCI_DEVICE_ID_INTEL_82371AB_0,
202                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
203                 if (dev) {
204                         pci_read_config_byte(dev, 0x76, &value1);
205                         pci_read_config_byte(dev, 0x77, &value2);
206                         if ((value1 & 0x80) || (value2 & 0x80))
207                                 errata.piix4.fdma = 1;
208                         pci_dev_put(dev);
209                 }
210
211                 break;
212         }
213
214         if (errata.piix4.bmisx)
215                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
216                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
217         if (errata.piix4.fdma)
218                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
219                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
220
221         return_VALUE(0);
222 }
223
224 static int acpi_processor_errata(struct acpi_processor *pr)
225 {
226         int result = 0;
227         struct pci_dev *dev = NULL;
228
229         ACPI_FUNCTION_TRACE("acpi_processor_errata");
230
231         if (!pr)
232                 return_VALUE(-EINVAL);
233
234         /*
235          * PIIX4
236          */
237         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
238                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
239                              PCI_ANY_ID, NULL);
240         if (dev) {
241                 result = acpi_processor_errata_piix4(dev);
242                 pci_dev_put(dev);
243         }
244
245         return_VALUE(result);
246 }
247
248 /* --------------------------------------------------------------------------
249                               Common ACPI processor functions
250    -------------------------------------------------------------------------- */
251
252 /*
253  * _PDC is required for a BIOS-OS handshake for most of the newer
254  * ACPI processor features.
255  */
256 static int acpi_processor_set_pdc(struct acpi_processor *pr)
257 {
258         struct acpi_object_list *pdc_in = pr->pdc;
259         acpi_status status = AE_OK;
260
261         ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
262
263         if (!pdc_in)
264                 return_VALUE(status);
265
266         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
267
268         if (ACPI_FAILURE(status))
269                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
270                     "Could not evaluate _PDC, using legacy perf. control...\n"));
271
272         return_VALUE(status);
273 }
274
275 /* --------------------------------------------------------------------------
276                               FS Interface (/proc)
277    -------------------------------------------------------------------------- */
278
279 static struct proc_dir_entry *acpi_processor_dir = NULL;
280
281 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
282 {
283         struct acpi_processor *pr = (struct acpi_processor *)seq->private;
284
285         ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
286
287         if (!pr)
288                 goto end;
289
290         seq_printf(seq, "processor id:            %d\n"
291                    "acpi id:                 %d\n"
292                    "bus mastering control:   %s\n"
293                    "power management:        %s\n"
294                    "throttling control:      %s\n"
295                    "limit interface:         %s\n",
296                    pr->id,
297                    pr->acpi_id,
298                    pr->flags.bm_control ? "yes" : "no",
299                    pr->flags.power ? "yes" : "no",
300                    pr->flags.throttling ? "yes" : "no",
301                    pr->flags.limit ? "yes" : "no");
302
303       end:
304         return_VALUE(0);
305 }
306
307 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
308 {
309         return single_open(file, acpi_processor_info_seq_show,
310                            PDE(inode)->data);
311 }
312
313 static int acpi_processor_add_fs(struct acpi_device *device)
314 {
315         struct proc_dir_entry *entry = NULL;
316
317         ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
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_VALUE(-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_VALUE(-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_VALUE(-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_VALUE( -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_VALUE(0);
363 }
364
365 static int acpi_processor_remove_fs(struct acpi_device *device)
366 {
367         ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
368
369         if (acpi_device_dir(device)) {
370                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
371                                   acpi_device_dir(device));
372                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
373                                   acpi_device_dir(device));
374                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
375                                   acpi_device_dir(device));
376                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
377                 acpi_device_dir(device) = NULL;
378         }
379
380         return_VALUE(0);
381 }
382
383 /* Use the acpiid in MADT to map cpus in case of SMP */
384 #ifndef CONFIG_SMP
385 #define convert_acpiid_to_cpu(acpi_id) (-1)
386 #else
387
388 #ifdef CONFIG_IA64
389 #define arch_acpiid_to_apicid   ia64_acpiid_to_sapicid
390 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
391 #define ARCH_BAD_APICID         (0xffff)
392 #else
393 #define arch_acpiid_to_apicid   x86_acpiid_to_apicid
394 #define arch_cpu_to_apicid      x86_cpu_to_apicid
395 #define ARCH_BAD_APICID         (0xff)
396 #endif
397
398 static int convert_acpiid_to_cpu(u8 acpi_id)
399 {
400         u16 apic_id;
401         int i;
402
403         apic_id = arch_acpiid_to_apicid[acpi_id];
404         if (apic_id == ARCH_BAD_APICID)
405                 return -1;
406
407         for (i = 0; i < NR_CPUS; i++) {
408                 if (arch_cpu_to_apicid[i] == apic_id)
409                         return i;
410         }
411         return -1;
412 }
413 #endif
414
415 /* --------------------------------------------------------------------------
416                                  Driver Interface
417    -------------------------------------------------------------------------- */
418
419 static int acpi_processor_get_info(struct acpi_processor *pr)
420 {
421         acpi_status status = 0;
422         union acpi_object object = { 0 };
423         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
424         int cpu_index;
425         static int cpu0_initialized;
426
427         ACPI_FUNCTION_TRACE("acpi_processor_get_info");
428
429         if (!pr)
430                 return_VALUE(-EINVAL);
431
432         if (num_online_cpus() > 1)
433                 errata.smp = TRUE;
434
435         acpi_processor_errata(pr);
436
437         /*
438          * Check to see if we have bus mastering arbitration control.  This
439          * is required for proper C3 usage (to maintain cache coherency).
440          */
441         if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
442                 pr->flags.bm_control = 1;
443                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
444                                   "Bus mastering arbitration control present\n"));
445         } else
446                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
447                                   "No bus mastering arbitration control\n"));
448
449         /*
450          * Evalute the processor object.  Note that it is common on SMP to
451          * have the first (boot) processor with a valid PBLK address while
452          * all others have a NULL address.
453          */
454         status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
455         if (ACPI_FAILURE(status)) {
456                 printk(KERN_ERR PREFIX "Evaluating processor object\n");
457                 return_VALUE(-ENODEV);
458         }
459
460         /*
461          * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
462          *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
463          */
464         pr->acpi_id = object.processor.proc_id;
465
466         cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
467
468         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
469         if (!cpu0_initialized && (cpu_index == -1) &&
470             (num_online_cpus() == 1)) {
471                 cpu_index = 0;
472         }
473
474         cpu0_initialized = 1;
475
476         pr->id = cpu_index;
477
478         /*
479          *  Extra Processor objects may be enumerated on MP systems with
480          *  less than the max # of CPUs. They should be ignored _iff
481          *  they are physically not present.
482          */
483         if (cpu_index == -1) {
484                 if (ACPI_FAILURE
485                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
486                         printk(KERN_ERR PREFIX
487                                     "Getting cpuindex for acpiid 0x%x\n",
488                                     pr->acpi_id);
489                         return_VALUE(-ENODEV);
490                 }
491         }
492
493         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
494                           pr->acpi_id));
495
496         if (!object.processor.pblk_address)
497                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
498         else if (object.processor.pblk_length != 6)
499                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
500                             object.processor.pblk_length);
501         else {
502                 pr->throttling.address = object.processor.pblk_address;
503                 pr->throttling.duty_offset = acpi_fadt.duty_offset;
504                 pr->throttling.duty_width = acpi_fadt.duty_width;
505
506                 pr->pblk = object.processor.pblk_address;
507
508                 /*
509                  * We don't care about error returns - we just try to mark
510                  * these reserved so that nobody else is confused into thinking
511                  * that this region might be unused..
512                  *
513                  * (In particular, allocating the IO range for Cardbus)
514                  */
515                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
516         }
517
518 #ifdef CONFIG_CPU_FREQ
519         acpi_processor_ppc_has_changed(pr);
520 #endif
521         acpi_processor_get_throttling_info(pr);
522         acpi_processor_get_limit_info(pr);
523
524         return_VALUE(0);
525 }
526
527 static void *processor_device_array[NR_CPUS];
528
529 static int acpi_processor_start(struct acpi_device *device)
530 {
531         int result = 0;
532         acpi_status status = AE_OK;
533         struct acpi_processor *pr;
534
535         ACPI_FUNCTION_TRACE("acpi_processor_start");
536
537         pr = acpi_driver_data(device);
538
539         result = acpi_processor_get_info(pr);
540         if (result) {
541                 /* Processor is physically not present */
542                 return_VALUE(0);
543         }
544
545         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
546
547         /*
548          * Buggy BIOS check
549          * ACPI id of processors can be reported wrongly by the BIOS.
550          * Don't trust it blindly
551          */
552         if (processor_device_array[pr->id] != NULL &&
553             processor_device_array[pr->id] != (void *)device) {
554                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
555                         "for the processor\n");
556                 return_VALUE(-ENODEV);
557         }
558         processor_device_array[pr->id] = (void *)device;
559
560         processors[pr->id] = pr;
561
562         result = acpi_processor_add_fs(device);
563         if (result)
564                 goto end;
565
566         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
567                                              acpi_processor_notify, pr);
568
569         /* _PDC call should be done before doing anything else (if reqd.). */
570         arch_acpi_processor_init_pdc(pr);
571         acpi_processor_set_pdc(pr);
572
573         acpi_processor_power_init(pr, device);
574
575         if (pr->flags.throttling) {
576                 printk(KERN_INFO PREFIX "%s [%s] (supports",
577                        acpi_device_name(device), acpi_device_bid(device));
578                 printk(" %d throttling states", pr->throttling.state_count);
579                 printk(")\n");
580         }
581
582       end:
583
584         return_VALUE(result);
585 }
586
587 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
588 {
589         struct acpi_processor *pr = (struct acpi_processor *)data;
590         struct acpi_device *device = NULL;
591
592         ACPI_FUNCTION_TRACE("acpi_processor_notify");
593
594         if (!pr)
595                 return_VOID;
596
597         if (acpi_bus_get_device(pr->handle, &device))
598                 return_VOID;
599
600         switch (event) {
601         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
602                 acpi_processor_ppc_has_changed(pr);
603                 acpi_bus_generate_event(device, event,
604                                         pr->performance_platform_limit);
605                 break;
606         case ACPI_PROCESSOR_NOTIFY_POWER:
607                 acpi_processor_cst_has_changed(pr);
608                 acpi_bus_generate_event(device, event, 0);
609                 break;
610         default:
611                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
612                                   "Unsupported event [0x%x]\n", event));
613                 break;
614         }
615
616         return_VOID;
617 }
618
619 static int acpi_processor_add(struct acpi_device *device)
620 {
621         struct acpi_processor *pr = NULL;
622
623         ACPI_FUNCTION_TRACE("acpi_processor_add");
624
625         if (!device)
626                 return_VALUE(-EINVAL);
627
628         pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
629         if (!pr)
630                 return_VALUE(-ENOMEM);
631         memset(pr, 0, sizeof(struct acpi_processor));
632
633         pr->handle = device->handle;
634         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
635         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
636         acpi_driver_data(device) = pr;
637
638         return_VALUE(0);
639 }
640
641 static int acpi_processor_remove(struct acpi_device *device, int type)
642 {
643         acpi_status status = AE_OK;
644         struct acpi_processor *pr = NULL;
645
646         ACPI_FUNCTION_TRACE("acpi_processor_remove");
647
648         if (!device || !acpi_driver_data(device))
649                 return_VALUE(-EINVAL);
650
651         pr = (struct acpi_processor *)acpi_driver_data(device);
652
653         if (pr->id >= NR_CPUS) {
654                 kfree(pr);
655                 return_VALUE(0);
656         }
657
658         if (type == ACPI_BUS_REMOVAL_EJECT) {
659                 if (acpi_processor_handle_eject(pr))
660                         return_VALUE(-EINVAL);
661         }
662
663         acpi_processor_power_exit(pr, device);
664
665         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
666                                             acpi_processor_notify);
667
668         acpi_processor_remove_fs(device);
669
670         processors[pr->id] = NULL;
671
672         kfree(pr);
673
674         return_VALUE(0);
675 }
676
677 #ifdef CONFIG_ACPI_HOTPLUG_CPU
678 /****************************************************************************
679  *      Acpi processor hotplug support                                      *
680  ****************************************************************************/
681
682 static int is_processor_present(acpi_handle handle);
683
684 static int is_processor_present(acpi_handle handle)
685 {
686         acpi_status status;
687         unsigned long sta = 0;
688
689         ACPI_FUNCTION_TRACE("is_processor_present");
690
691         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
692         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
693                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
694                 return_VALUE(0);
695         }
696         return_VALUE(1);
697 }
698
699 static
700 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
701 {
702         acpi_handle phandle;
703         struct acpi_device *pdev;
704         struct acpi_processor *pr;
705
706         ACPI_FUNCTION_TRACE("acpi_processor_device_add");
707
708         if (acpi_get_parent(handle, &phandle)) {
709                 return_VALUE(-ENODEV);
710         }
711
712         if (acpi_bus_get_device(phandle, &pdev)) {
713                 return_VALUE(-ENODEV);
714         }
715
716         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
717                 return_VALUE(-ENODEV);
718         }
719
720         acpi_bus_start(*device);
721
722         pr = acpi_driver_data(*device);
723         if (!pr)
724                 return_VALUE(-ENODEV);
725
726         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
727                 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
728         }
729         return_VALUE(0);
730 }
731
732 static void
733 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
734 {
735         struct acpi_processor *pr;
736         struct acpi_device *device = NULL;
737         int result;
738
739         ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
740
741         switch (event) {
742         case ACPI_NOTIFY_BUS_CHECK:
743         case ACPI_NOTIFY_DEVICE_CHECK:
744                 printk("Processor driver received %s event\n",
745                        (event == ACPI_NOTIFY_BUS_CHECK) ?
746                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
747
748                 if (!is_processor_present(handle))
749                         break;
750
751                 if (acpi_bus_get_device(handle, &device)) {
752                         result = acpi_processor_device_add(handle, &device);
753                         if (result)
754                                 printk(KERN_ERR PREFIX
755                                             "Unable to add the device\n");
756                         break;
757                 }
758
759                 pr = acpi_driver_data(device);
760                 if (!pr) {
761                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
762                         break;
763                 }
764
765                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
766                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
767                         break;
768                 }
769
770                 result = acpi_processor_start(device);
771                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
772                         kobject_uevent(&device->kobj, KOBJ_ONLINE);
773                 } else {
774                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
775                                     acpi_device_bid(device));
776                 }
777                 break;
778         case ACPI_NOTIFY_EJECT_REQUEST:
779                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
780                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
781
782                 if (acpi_bus_get_device(handle, &device)) {
783                         printk(KERN_ERR PREFIX
784                                     "Device don't exist, dropping EJECT\n");
785                         break;
786                 }
787                 pr = acpi_driver_data(device);
788                 if (!pr) {
789                         printk(KERN_ERR PREFIX
790                                     "Driver data is NULL, dropping EJECT\n");
791                         return_VOID;
792                 }
793
794                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
795                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
796                 break;
797         default:
798                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
799                                   "Unsupported event [0x%x]\n", event));
800                 break;
801         }
802
803         return_VOID;
804 }
805
806 static acpi_status
807 processor_walk_namespace_cb(acpi_handle handle,
808                             u32 lvl, void *context, void **rv)
809 {
810         acpi_status status;
811         int *action = context;
812         acpi_object_type type = 0;
813
814         status = acpi_get_type(handle, &type);
815         if (ACPI_FAILURE(status))
816                 return (AE_OK);
817
818         if (type != ACPI_TYPE_PROCESSOR)
819                 return (AE_OK);
820
821         switch (*action) {
822         case INSTALL_NOTIFY_HANDLER:
823                 acpi_install_notify_handler(handle,
824                                             ACPI_SYSTEM_NOTIFY,
825                                             acpi_processor_hotplug_notify,
826                                             NULL);
827                 break;
828         case UNINSTALL_NOTIFY_HANDLER:
829                 acpi_remove_notify_handler(handle,
830                                            ACPI_SYSTEM_NOTIFY,
831                                            acpi_processor_hotplug_notify);
832                 break;
833         default:
834                 break;
835         }
836
837         return (AE_OK);
838 }
839
840 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
841 {
842         ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
843
844         if (!is_processor_present(handle)) {
845                 return_VALUE(AE_ERROR);
846         }
847
848         if (acpi_map_lsapic(handle, p_cpu))
849                 return_VALUE(AE_ERROR);
850
851         if (arch_register_cpu(*p_cpu)) {
852                 acpi_unmap_lsapic(*p_cpu);
853                 return_VALUE(AE_ERROR);
854         }
855
856         return_VALUE(AE_OK);
857 }
858
859 static int acpi_processor_handle_eject(struct acpi_processor *pr)
860 {
861         if (cpu_online(pr->id)) {
862                 return (-EINVAL);
863         }
864         arch_unregister_cpu(pr->id);
865         acpi_unmap_lsapic(pr->id);
866         return (0);
867 }
868 #else
869 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
870 {
871         return AE_ERROR;
872 }
873 static int acpi_processor_handle_eject(struct acpi_processor *pr)
874 {
875         return (-EINVAL);
876 }
877 #endif
878
879 static
880 void acpi_processor_install_hotplug_notify(void)
881 {
882 #ifdef CONFIG_ACPI_HOTPLUG_CPU
883         int action = INSTALL_NOTIFY_HANDLER;
884         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
885                             ACPI_ROOT_OBJECT,
886                             ACPI_UINT32_MAX,
887                             processor_walk_namespace_cb, &action, NULL);
888 #endif
889 }
890
891 static
892 void acpi_processor_uninstall_hotplug_notify(void)
893 {
894 #ifdef CONFIG_ACPI_HOTPLUG_CPU
895         int action = UNINSTALL_NOTIFY_HANDLER;
896         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
897                             ACPI_ROOT_OBJECT,
898                             ACPI_UINT32_MAX,
899                             processor_walk_namespace_cb, &action, NULL);
900 #endif
901 }
902
903 /*
904  * We keep the driver loaded even when ACPI is not running.
905  * This is needed for the powernow-k8 driver, that works even without
906  * ACPI, but needs symbols from this driver
907  */
908
909 static int __init acpi_processor_init(void)
910 {
911         int result = 0;
912
913         ACPI_FUNCTION_TRACE("acpi_processor_init");
914
915         memset(&processors, 0, sizeof(processors));
916         memset(&errata, 0, sizeof(errata));
917
918         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
919         if (!acpi_processor_dir)
920                 return_VALUE(0);
921         acpi_processor_dir->owner = THIS_MODULE;
922
923         result = acpi_bus_register_driver(&acpi_processor_driver);
924         if (result < 0) {
925                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
926                 return_VALUE(0);
927         }
928
929         acpi_processor_install_hotplug_notify();
930
931         acpi_thermal_cpufreq_init();
932
933         acpi_processor_ppc_init();
934
935         return_VALUE(0);
936 }
937
938 static void __exit acpi_processor_exit(void)
939 {
940         ACPI_FUNCTION_TRACE("acpi_processor_exit");
941
942         acpi_processor_ppc_exit();
943
944         acpi_thermal_cpufreq_exit();
945
946         acpi_processor_uninstall_hotplug_notify();
947
948         acpi_bus_unregister_driver(&acpi_processor_driver);
949
950         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
951
952         return_VOID;
953 }
954
955 module_init(acpi_processor_init);
956 module_exit(acpi_processor_exit);
957
958 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
959
960 MODULE_ALIAS("processor");