[ACPI] fix 2.6.13 boot hang regression on HT box w/ broken BIOS
[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;
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 fucntions
250    -------------------------------------------------------------------------- */
251
252 /*
253  * _PDC is required for a BIOS-OS handshake for most of the newer
254  * ACPI processor features.
255  */
256
257 int acpi_processor_set_pdc(struct acpi_processor *pr,
258                            struct acpi_object_list *pdc_in)
259 {
260         acpi_status status = AE_OK;
261         u32 arg0_buf[3];
262         union acpi_object arg0 = { ACPI_TYPE_BUFFER };
263         struct acpi_object_list no_object = { 1, &arg0 };
264         struct acpi_object_list *pdc;
265
266         ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
267
268         arg0.buffer.length = 12;
269         arg0.buffer.pointer = (u8 *) arg0_buf;
270         arg0_buf[0] = ACPI_PDC_REVISION_ID;
271         arg0_buf[1] = 0;
272         arg0_buf[2] = 0;
273
274         pdc = (pdc_in) ? pdc_in : &no_object;
275
276         status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL);
277
278         if ((ACPI_FAILURE(status)) && (pdc_in))
279                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
280                                   "Error evaluating _PDC, using legacy perf. control...\n"));
281
282         return_VALUE(status);
283 }
284
285 /* --------------------------------------------------------------------------
286                               FS Interface (/proc)
287    -------------------------------------------------------------------------- */
288
289 static struct proc_dir_entry *acpi_processor_dir = NULL;
290
291 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
292 {
293         struct acpi_processor *pr = (struct acpi_processor *)seq->private;
294
295         ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
296
297         if (!pr)
298                 goto end;
299
300         seq_printf(seq, "processor id:            %d\n"
301                    "acpi id:                 %d\n"
302                    "bus mastering control:   %s\n"
303                    "power management:        %s\n"
304                    "throttling control:      %s\n"
305                    "limit interface:         %s\n",
306                    pr->id,
307                    pr->acpi_id,
308                    pr->flags.bm_control ? "yes" : "no",
309                    pr->flags.power ? "yes" : "no",
310                    pr->flags.throttling ? "yes" : "no",
311                    pr->flags.limit ? "yes" : "no");
312
313       end:
314         return_VALUE(0);
315 }
316
317 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
318 {
319         return single_open(file, acpi_processor_info_seq_show,
320                            PDE(inode)->data);
321 }
322
323 static int acpi_processor_add_fs(struct acpi_device *device)
324 {
325         struct proc_dir_entry *entry = NULL;
326
327         ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
328
329         if (!acpi_device_dir(device)) {
330                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
331                                                      acpi_processor_dir);
332                 if (!acpi_device_dir(device))
333                         return_VALUE(-ENODEV);
334         }
335         acpi_device_dir(device)->owner = THIS_MODULE;
336
337         /* 'info' [R] */
338         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
339                                   S_IRUGO, acpi_device_dir(device));
340         if (!entry)
341                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
342                                   "Unable to create '%s' fs entry\n",
343                                   ACPI_PROCESSOR_FILE_INFO));
344         else {
345                 entry->proc_fops = &acpi_processor_info_fops;
346                 entry->data = acpi_driver_data(device);
347                 entry->owner = THIS_MODULE;
348         }
349
350         /* 'throttling' [R/W] */
351         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
352                                   S_IFREG | S_IRUGO | S_IWUSR,
353                                   acpi_device_dir(device));
354         if (!entry)
355                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
356                                   "Unable to create '%s' fs entry\n",
357                                   ACPI_PROCESSOR_FILE_THROTTLING));
358         else {
359                 entry->proc_fops = &acpi_processor_throttling_fops;
360                 entry->proc_fops->write = acpi_processor_write_throttling;
361                 entry->data = acpi_driver_data(device);
362                 entry->owner = THIS_MODULE;
363         }
364
365         /* 'limit' [R/W] */
366         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
367                                   S_IFREG | S_IRUGO | S_IWUSR,
368                                   acpi_device_dir(device));
369         if (!entry)
370                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
371                                   "Unable to create '%s' fs entry\n",
372                                   ACPI_PROCESSOR_FILE_LIMIT));
373         else {
374                 entry->proc_fops = &acpi_processor_limit_fops;
375                 entry->proc_fops->write = acpi_processor_write_limit;
376                 entry->data = acpi_driver_data(device);
377                 entry->owner = THIS_MODULE;
378         }
379
380         return_VALUE(0);
381 }
382
383 static int acpi_processor_remove_fs(struct acpi_device *device)
384 {
385         ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
386
387         if (acpi_device_dir(device)) {
388                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
389                                   acpi_device_dir(device));
390                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
391                                   acpi_device_dir(device));
392                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
393                                   acpi_device_dir(device));
394                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
395                 acpi_device_dir(device) = NULL;
396         }
397
398         return_VALUE(0);
399 }
400
401 /* Use the acpiid in MADT to map cpus in case of SMP */
402 #ifndef CONFIG_SMP
403 #define convert_acpiid_to_cpu(acpi_id) (0xff)
404 #else
405
406 #ifdef CONFIG_IA64
407 #define arch_acpiid_to_apicid   ia64_acpiid_to_sapicid
408 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
409 #define ARCH_BAD_APICID         (0xffff)
410 #else
411 #define arch_acpiid_to_apicid   x86_acpiid_to_apicid
412 #define arch_cpu_to_apicid      x86_cpu_to_apicid
413 #define ARCH_BAD_APICID         (0xff)
414 #endif
415
416 static u8 convert_acpiid_to_cpu(u8 acpi_id)
417 {
418         u16 apic_id;
419         int i;
420
421         apic_id = arch_acpiid_to_apicid[acpi_id];
422         if (apic_id == ARCH_BAD_APICID)
423                 return -1;
424
425         for (i = 0; i < NR_CPUS; i++) {
426                 if (arch_cpu_to_apicid[i] == apic_id)
427                         return i;
428         }
429         return -1;
430 }
431 #endif
432
433 /* --------------------------------------------------------------------------
434                                  Driver Interface
435    -------------------------------------------------------------------------- */
436
437 static int acpi_processor_get_info(struct acpi_processor *pr)
438 {
439         acpi_status status = 0;
440         union acpi_object object = { 0 };
441         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
442         u8 cpu_index;
443         static int cpu0_initialized;
444
445         ACPI_FUNCTION_TRACE("acpi_processor_get_info");
446
447         if (!pr)
448                 return_VALUE(-EINVAL);
449
450         if (num_online_cpus() > 1)
451                 errata.smp = TRUE;
452
453         acpi_processor_errata(pr);
454
455         /*
456          * Check to see if we have bus mastering arbitration control.  This
457          * is required for proper C3 usage (to maintain cache coherency).
458          */
459         if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
460                 pr->flags.bm_control = 1;
461                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
462                                   "Bus mastering arbitration control present\n"));
463         } else
464                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
465                                   "No bus mastering arbitration control\n"));
466
467         /*
468          * Evalute the processor object.  Note that it is common on SMP to
469          * have the first (boot) processor with a valid PBLK address while
470          * all others have a NULL address.
471          */
472         status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
473         if (ACPI_FAILURE(status)) {
474                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
475                                   "Error evaluating processor object\n"));
476                 return_VALUE(-ENODEV);
477         }
478
479         /*
480          * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
481          *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
482          */
483         pr->acpi_id = object.processor.proc_id;
484
485         cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
486
487         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
488         if (!cpu0_initialized && (cpu_index == 0xff) &&
489             (num_online_cpus() == 1)) {
490                 cpu_index = 0;
491         }
492
493         cpu0_initialized = 1;
494
495         pr->id = cpu_index;
496
497         /*
498          *  Extra Processor objects may be enumerated on MP systems with
499          *  less than the max # of CPUs. They should be ignored _iff
500          *  they are physically not present.
501          */
502         if (cpu_index >= NR_CPUS) {
503                 if (ACPI_FAILURE
504                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
505                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
506                                           "Error getting cpuindex for acpiid 0x%x\n",
507                                           pr->acpi_id));
508                         return_VALUE(-ENODEV);
509                 }
510         }
511
512         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
513                           pr->acpi_id));
514
515         if (!object.processor.pblk_address)
516                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
517         else if (object.processor.pblk_length != 6)
518                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n",
519                                   object.processor.pblk_length));
520         else {
521                 pr->throttling.address = object.processor.pblk_address;
522                 pr->throttling.duty_offset = acpi_fadt.duty_offset;
523                 pr->throttling.duty_width = acpi_fadt.duty_width;
524
525                 pr->pblk = object.processor.pblk_address;
526
527                 /*
528                  * We don't care about error returns - we just try to mark
529                  * these reserved so that nobody else is confused into thinking
530                  * that this region might be unused..
531                  *
532                  * (In particular, allocating the IO range for Cardbus)
533                  */
534                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
535         }
536
537 #ifdef CONFIG_CPU_FREQ
538         acpi_processor_ppc_has_changed(pr);
539 #endif
540         acpi_processor_get_throttling_info(pr);
541         acpi_processor_get_limit_info(pr);
542
543         return_VALUE(0);
544 }
545
546 static void *processor_device_array[NR_CPUS];
547
548 static int acpi_processor_start(struct acpi_device *device)
549 {
550         int result = 0;
551         acpi_status status = AE_OK;
552         struct acpi_processor *pr;
553
554         ACPI_FUNCTION_TRACE("acpi_processor_start");
555
556         pr = acpi_driver_data(device);
557
558         result = acpi_processor_get_info(pr);
559         if (result) {
560                 /* Processor is physically not present */
561                 return_VALUE(0);
562         }
563
564         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
565
566         /*
567          * Buggy BIOS check
568          * ACPI id of processors can be reported wrongly by the BIOS.
569          * Don't trust it blindly
570          */
571         if (processor_device_array[pr->id] != NULL &&
572             processor_device_array[pr->id] != (void *)device) {
573                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "BIOS reporting wrong ACPI id"
574                         "for the processor\n"));
575                 return_VALUE(-ENODEV);
576         }
577         processor_device_array[pr->id] = (void *)device;
578
579         processors[pr->id] = pr;
580
581         result = acpi_processor_add_fs(device);
582         if (result)
583                 goto end;
584
585         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
586                                              acpi_processor_notify, pr);
587         if (ACPI_FAILURE(status)) {
588                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
589                                   "Error installing device notify handler\n"));
590         }
591
592         acpi_processor_power_init(pr, device);
593
594         if (pr->flags.throttling) {
595                 printk(KERN_INFO PREFIX "%s [%s] (supports",
596                        acpi_device_name(device), acpi_device_bid(device));
597                 printk(" %d throttling states", pr->throttling.state_count);
598                 printk(")\n");
599         }
600
601       end:
602
603         return_VALUE(result);
604 }
605
606 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
607 {
608         struct acpi_processor *pr = (struct acpi_processor *)data;
609         struct acpi_device *device = NULL;
610
611         ACPI_FUNCTION_TRACE("acpi_processor_notify");
612
613         if (!pr)
614                 return_VOID;
615
616         if (acpi_bus_get_device(pr->handle, &device))
617                 return_VOID;
618
619         switch (event) {
620         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
621                 acpi_processor_ppc_has_changed(pr);
622                 acpi_bus_generate_event(device, event,
623                                         pr->performance_platform_limit);
624                 break;
625         case ACPI_PROCESSOR_NOTIFY_POWER:
626                 acpi_processor_cst_has_changed(pr);
627                 acpi_bus_generate_event(device, event, 0);
628                 break;
629         default:
630                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
631                                   "Unsupported event [0x%x]\n", event));
632                 break;
633         }
634
635         return_VOID;
636 }
637
638 static int acpi_processor_add(struct acpi_device *device)
639 {
640         struct acpi_processor *pr = NULL;
641
642         ACPI_FUNCTION_TRACE("acpi_processor_add");
643
644         if (!device)
645                 return_VALUE(-EINVAL);
646
647         pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
648         if (!pr)
649                 return_VALUE(-ENOMEM);
650         memset(pr, 0, sizeof(struct acpi_processor));
651
652         pr->handle = device->handle;
653         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
654         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
655         acpi_driver_data(device) = pr;
656
657         return_VALUE(0);
658 }
659
660 static int acpi_processor_remove(struct acpi_device *device, int type)
661 {
662         acpi_status status = AE_OK;
663         struct acpi_processor *pr = NULL;
664
665         ACPI_FUNCTION_TRACE("acpi_processor_remove");
666
667         if (!device || !acpi_driver_data(device))
668                 return_VALUE(-EINVAL);
669
670         pr = (struct acpi_processor *)acpi_driver_data(device);
671
672         if (pr->id >= NR_CPUS) {
673                 kfree(pr);
674                 return_VALUE(0);
675         }
676
677         if (type == ACPI_BUS_REMOVAL_EJECT) {
678                 if (acpi_processor_handle_eject(pr))
679                         return_VALUE(-EINVAL);
680         }
681
682         acpi_processor_power_exit(pr, device);
683
684         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
685                                             acpi_processor_notify);
686         if (ACPI_FAILURE(status)) {
687                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
688                                   "Error removing notify handler\n"));
689         }
690
691         acpi_processor_remove_fs(device);
692
693         processors[pr->id] = NULL;
694
695         kfree(pr);
696
697         return_VALUE(0);
698 }
699
700 #ifdef CONFIG_ACPI_HOTPLUG_CPU
701 /****************************************************************************
702  *      Acpi processor hotplug support                                      *
703  ****************************************************************************/
704
705 static int is_processor_present(acpi_handle handle);
706
707 static int is_processor_present(acpi_handle handle)
708 {
709         acpi_status status;
710         unsigned long sta = 0;
711
712         ACPI_FUNCTION_TRACE("is_processor_present");
713
714         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
715         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
716                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
717                                   "Processor Device is not present\n"));
718                 return_VALUE(0);
719         }
720         return_VALUE(1);
721 }
722
723 static
724 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
725 {
726         acpi_handle phandle;
727         struct acpi_device *pdev;
728         struct acpi_processor *pr;
729
730         ACPI_FUNCTION_TRACE("acpi_processor_device_add");
731
732         if (acpi_get_parent(handle, &phandle)) {
733                 return_VALUE(-ENODEV);
734         }
735
736         if (acpi_bus_get_device(phandle, &pdev)) {
737                 return_VALUE(-ENODEV);
738         }
739
740         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
741                 return_VALUE(-ENODEV);
742         }
743
744         acpi_bus_start(*device);
745
746         pr = acpi_driver_data(*device);
747         if (!pr)
748                 return_VALUE(-ENODEV);
749
750         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
751                 kobject_hotplug(&(*device)->kobj, KOBJ_ONLINE);
752         }
753         return_VALUE(0);
754 }
755
756 static void
757 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
758 {
759         struct acpi_processor *pr;
760         struct acpi_device *device = NULL;
761         int result;
762
763         ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
764
765         switch (event) {
766         case ACPI_NOTIFY_BUS_CHECK:
767         case ACPI_NOTIFY_DEVICE_CHECK:
768                 printk("Processor driver received %s event\n",
769                        (event == ACPI_NOTIFY_BUS_CHECK) ?
770                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
771
772                 if (!is_processor_present(handle))
773                         break;
774
775                 if (acpi_bus_get_device(handle, &device)) {
776                         result = acpi_processor_device_add(handle, &device);
777                         if (result)
778                                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
779                                                   "Unable to add the device\n"));
780                         break;
781                 }
782
783                 pr = acpi_driver_data(device);
784                 if (!pr) {
785                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
786                                           "Driver data is NULL\n"));
787                         break;
788                 }
789
790                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
791                         kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
792                         break;
793                 }
794
795                 result = acpi_processor_start(device);
796                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
797                         kobject_hotplug(&device->kobj, KOBJ_ONLINE);
798                 } else {
799                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
800                                           "Device [%s] failed to start\n",
801                                           acpi_device_bid(device)));
802                 }
803                 break;
804         case ACPI_NOTIFY_EJECT_REQUEST:
805                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
806                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
807
808                 if (acpi_bus_get_device(handle, &device)) {
809                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
810                                           "Device don't exist, dropping EJECT\n"));
811                         break;
812                 }
813                 pr = acpi_driver_data(device);
814                 if (!pr) {
815                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
816                                           "Driver data is NULL, dropping EJECT\n"));
817                         return_VOID;
818                 }
819
820                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
821                         kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
822                 break;
823         default:
824                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
825                                   "Unsupported event [0x%x]\n", event));
826                 break;
827         }
828
829         return_VOID;
830 }
831
832 static acpi_status
833 processor_walk_namespace_cb(acpi_handle handle,
834                             u32 lvl, void *context, void **rv)
835 {
836         acpi_status status;
837         int *action = context;
838         acpi_object_type type = 0;
839
840         status = acpi_get_type(handle, &type);
841         if (ACPI_FAILURE(status))
842                 return (AE_OK);
843
844         if (type != ACPI_TYPE_PROCESSOR)
845                 return (AE_OK);
846
847         switch (*action) {
848         case INSTALL_NOTIFY_HANDLER:
849                 acpi_install_notify_handler(handle,
850                                             ACPI_SYSTEM_NOTIFY,
851                                             acpi_processor_hotplug_notify,
852                                             NULL);
853                 break;
854         case UNINSTALL_NOTIFY_HANDLER:
855                 acpi_remove_notify_handler(handle,
856                                            ACPI_SYSTEM_NOTIFY,
857                                            acpi_processor_hotplug_notify);
858                 break;
859         default:
860                 break;
861         }
862
863         return (AE_OK);
864 }
865
866 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
867 {
868         ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
869
870         if (!is_processor_present(handle)) {
871                 return_VALUE(AE_ERROR);
872         }
873
874         if (acpi_map_lsapic(handle, p_cpu))
875                 return_VALUE(AE_ERROR);
876
877         if (arch_register_cpu(*p_cpu)) {
878                 acpi_unmap_lsapic(*p_cpu);
879                 return_VALUE(AE_ERROR);
880         }
881
882         return_VALUE(AE_OK);
883 }
884
885 static int acpi_processor_handle_eject(struct acpi_processor *pr)
886 {
887         if (cpu_online(pr->id)) {
888                 return (-EINVAL);
889         }
890         arch_unregister_cpu(pr->id);
891         acpi_unmap_lsapic(pr->id);
892         return (0);
893 }
894 #else
895 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
896 {
897         return AE_ERROR;
898 }
899 static int acpi_processor_handle_eject(struct acpi_processor *pr)
900 {
901         return (-EINVAL);
902 }
903 #endif
904
905 static
906 void acpi_processor_install_hotplug_notify(void)
907 {
908 #ifdef CONFIG_ACPI_HOTPLUG_CPU
909         int action = INSTALL_NOTIFY_HANDLER;
910         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
911                             ACPI_ROOT_OBJECT,
912                             ACPI_UINT32_MAX,
913                             processor_walk_namespace_cb, &action, NULL);
914 #endif
915 }
916
917 static
918 void acpi_processor_uninstall_hotplug_notify(void)
919 {
920 #ifdef CONFIG_ACPI_HOTPLUG_CPU
921         int action = UNINSTALL_NOTIFY_HANDLER;
922         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
923                             ACPI_ROOT_OBJECT,
924                             ACPI_UINT32_MAX,
925                             processor_walk_namespace_cb, &action, NULL);
926 #endif
927 }
928
929 /*
930  * We keep the driver loaded even when ACPI is not running.
931  * This is needed for the powernow-k8 driver, that works even without
932  * ACPI, but needs symbols from this driver
933  */
934
935 static int __init acpi_processor_init(void)
936 {
937         int result = 0;
938
939         ACPI_FUNCTION_TRACE("acpi_processor_init");
940
941         memset(&processors, 0, sizeof(processors));
942         memset(&errata, 0, sizeof(errata));
943
944         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
945         if (!acpi_processor_dir)
946                 return_VALUE(0);
947         acpi_processor_dir->owner = THIS_MODULE;
948
949         result = acpi_bus_register_driver(&acpi_processor_driver);
950         if (result < 0) {
951                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
952                 return_VALUE(0);
953         }
954
955         acpi_processor_install_hotplug_notify();
956
957         acpi_thermal_cpufreq_init();
958
959         acpi_processor_ppc_init();
960
961         return_VALUE(0);
962 }
963
964 static void __exit acpi_processor_exit(void)
965 {
966         ACPI_FUNCTION_TRACE("acpi_processor_exit");
967
968         acpi_processor_ppc_exit();
969
970         acpi_thermal_cpufreq_exit();
971
972         acpi_processor_uninstall_hotplug_notify();
973
974         acpi_bus_unregister_driver(&acpi_processor_driver);
975
976         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
977
978         return_VOID;
979 }
980
981 module_init(acpi_processor_init);
982 module_exit(acpi_processor_exit);
983
984 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
985
986 MODULE_ALIAS("processor");