Pull bugzilla-5452 into release branch
[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 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                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
332                                   "Unable to create '%s' fs entry\n",
333                                   ACPI_PROCESSOR_FILE_INFO));
334         else {
335                 entry->proc_fops = &acpi_processor_info_fops;
336                 entry->data = acpi_driver_data(device);
337                 entry->owner = THIS_MODULE;
338         }
339
340         /* 'throttling' [R/W] */
341         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
342                                   S_IFREG | S_IRUGO | S_IWUSR,
343                                   acpi_device_dir(device));
344         if (!entry)
345                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
346                                   "Unable to create '%s' fs entry\n",
347                                   ACPI_PROCESSOR_FILE_THROTTLING));
348         else {
349                 entry->proc_fops = &acpi_processor_throttling_fops;
350                 entry->data = acpi_driver_data(device);
351                 entry->owner = THIS_MODULE;
352         }
353
354         /* 'limit' [R/W] */
355         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
356                                   S_IFREG | S_IRUGO | S_IWUSR,
357                                   acpi_device_dir(device));
358         if (!entry)
359                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
360                                   "Unable to create '%s' fs entry\n",
361                                   ACPI_PROCESSOR_FILE_LIMIT));
362         else {
363                 entry->proc_fops = &acpi_processor_limit_fops;
364                 entry->data = acpi_driver_data(device);
365                 entry->owner = THIS_MODULE;
366         }
367
368         return_VALUE(0);
369 }
370
371 static int acpi_processor_remove_fs(struct acpi_device *device)
372 {
373         ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
374
375         if (acpi_device_dir(device)) {
376                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
377                                   acpi_device_dir(device));
378                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
379                                   acpi_device_dir(device));
380                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
381                                   acpi_device_dir(device));
382                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
383                 acpi_device_dir(device) = NULL;
384         }
385
386         return_VALUE(0);
387 }
388
389 /* Use the acpiid in MADT to map cpus in case of SMP */
390 #ifndef CONFIG_SMP
391 #define convert_acpiid_to_cpu(acpi_id) (-1)
392 #else
393
394 #ifdef CONFIG_IA64
395 #define arch_acpiid_to_apicid   ia64_acpiid_to_sapicid
396 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
397 #define ARCH_BAD_APICID         (0xffff)
398 #else
399 #define arch_acpiid_to_apicid   x86_acpiid_to_apicid
400 #define arch_cpu_to_apicid      x86_cpu_to_apicid
401 #define ARCH_BAD_APICID         (0xff)
402 #endif
403
404 static int convert_acpiid_to_cpu(u8 acpi_id)
405 {
406         u16 apic_id;
407         int i;
408
409         apic_id = arch_acpiid_to_apicid[acpi_id];
410         if (apic_id == ARCH_BAD_APICID)
411                 return -1;
412
413         for (i = 0; i < NR_CPUS; i++) {
414                 if (arch_cpu_to_apicid[i] == apic_id)
415                         return i;
416         }
417         return -1;
418 }
419 #endif
420
421 /* --------------------------------------------------------------------------
422                                  Driver Interface
423    -------------------------------------------------------------------------- */
424
425 static int acpi_processor_get_info(struct acpi_processor *pr)
426 {
427         acpi_status status = 0;
428         union acpi_object object = { 0 };
429         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
430         int cpu_index;
431         static int cpu0_initialized;
432
433         ACPI_FUNCTION_TRACE("acpi_processor_get_info");
434
435         if (!pr)
436                 return_VALUE(-EINVAL);
437
438         if (num_online_cpus() > 1)
439                 errata.smp = TRUE;
440
441         acpi_processor_errata(pr);
442
443         /*
444          * Check to see if we have bus mastering arbitration control.  This
445          * is required for proper C3 usage (to maintain cache coherency).
446          */
447         if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
448                 pr->flags.bm_control = 1;
449                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
450                                   "Bus mastering arbitration control present\n"));
451         } else
452                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
453                                   "No bus mastering arbitration control\n"));
454
455         /*
456          * Evalute the processor object.  Note that it is common on SMP to
457          * have the first (boot) processor with a valid PBLK address while
458          * all others have a NULL address.
459          */
460         status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
461         if (ACPI_FAILURE(status)) {
462                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
463                                   "Error evaluating processor object\n"));
464                 return_VALUE(-ENODEV);
465         }
466
467         /*
468          * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
469          *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
470          */
471         pr->acpi_id = object.processor.proc_id;
472
473         cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
474
475         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
476         if (!cpu0_initialized && (cpu_index == -1) &&
477             (num_online_cpus() == 1)) {
478                 cpu_index = 0;
479         }
480
481         cpu0_initialized = 1;
482
483         pr->id = cpu_index;
484
485         /*
486          *  Extra Processor objects may be enumerated on MP systems with
487          *  less than the max # of CPUs. They should be ignored _iff
488          *  they are physically not present.
489          */
490         if (cpu_index == -1) {
491                 if (ACPI_FAILURE
492                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
493                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
494                                           "Error getting cpuindex for acpiid 0x%x\n",
495                                           pr->acpi_id));
496                         return_VALUE(-ENODEV);
497                 }
498         }
499
500         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
501                           pr->acpi_id));
502
503         if (!object.processor.pblk_address)
504                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
505         else if (object.processor.pblk_length != 6)
506                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n",
507                                   object.processor.pblk_length));
508         else {
509                 pr->throttling.address = object.processor.pblk_address;
510                 pr->throttling.duty_offset = acpi_fadt.duty_offset;
511                 pr->throttling.duty_width = acpi_fadt.duty_width;
512
513                 pr->pblk = object.processor.pblk_address;
514
515                 /*
516                  * We don't care about error returns - we just try to mark
517                  * these reserved so that nobody else is confused into thinking
518                  * that this region might be unused..
519                  *
520                  * (In particular, allocating the IO range for Cardbus)
521                  */
522                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
523         }
524
525 #ifdef CONFIG_CPU_FREQ
526         acpi_processor_ppc_has_changed(pr);
527 #endif
528         acpi_processor_get_throttling_info(pr);
529         acpi_processor_get_limit_info(pr);
530
531         return_VALUE(0);
532 }
533
534 static void *processor_device_array[NR_CPUS];
535
536 static int acpi_processor_start(struct acpi_device *device)
537 {
538         int result = 0;
539         acpi_status status = AE_OK;
540         struct acpi_processor *pr;
541
542         ACPI_FUNCTION_TRACE("acpi_processor_start");
543
544         pr = acpi_driver_data(device);
545
546         result = acpi_processor_get_info(pr);
547         if (result) {
548                 /* Processor is physically not present */
549                 return_VALUE(0);
550         }
551
552         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
553
554         /*
555          * Buggy BIOS check
556          * ACPI id of processors can be reported wrongly by the BIOS.
557          * Don't trust it blindly
558          */
559         if (processor_device_array[pr->id] != NULL &&
560             processor_device_array[pr->id] != (void *)device) {
561                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
562                         "for the processor\n");
563                 return_VALUE(-ENODEV);
564         }
565         processor_device_array[pr->id] = (void *)device;
566
567         processors[pr->id] = pr;
568
569         result = acpi_processor_add_fs(device);
570         if (result)
571                 goto end;
572
573         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
574                                              acpi_processor_notify, pr);
575         if (ACPI_FAILURE(status)) {
576                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
577                                   "Error installing device notify handler\n"));
578         }
579
580         /* _PDC call should be done before doing anything else (if reqd.). */
581         arch_acpi_processor_init_pdc(pr);
582         acpi_processor_set_pdc(pr);
583
584         acpi_processor_power_init(pr, device);
585
586         if (pr->flags.throttling) {
587                 printk(KERN_INFO PREFIX "%s [%s] (supports",
588                        acpi_device_name(device), acpi_device_bid(device));
589                 printk(" %d throttling states", pr->throttling.state_count);
590                 printk(")\n");
591         }
592
593       end:
594
595         return_VALUE(result);
596 }
597
598 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
599 {
600         struct acpi_processor *pr = (struct acpi_processor *)data;
601         struct acpi_device *device = NULL;
602
603         ACPI_FUNCTION_TRACE("acpi_processor_notify");
604
605         if (!pr)
606                 return_VOID;
607
608         if (acpi_bus_get_device(pr->handle, &device))
609                 return_VOID;
610
611         switch (event) {
612         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
613                 acpi_processor_ppc_has_changed(pr);
614                 acpi_bus_generate_event(device, event,
615                                         pr->performance_platform_limit);
616                 break;
617         case ACPI_PROCESSOR_NOTIFY_POWER:
618                 acpi_processor_cst_has_changed(pr);
619                 acpi_bus_generate_event(device, event, 0);
620                 break;
621         default:
622                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
623                                   "Unsupported event [0x%x]\n", event));
624                 break;
625         }
626
627         return_VOID;
628 }
629
630 static int acpi_processor_add(struct acpi_device *device)
631 {
632         struct acpi_processor *pr = NULL;
633
634         ACPI_FUNCTION_TRACE("acpi_processor_add");
635
636         if (!device)
637                 return_VALUE(-EINVAL);
638
639         pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
640         if (!pr)
641                 return_VALUE(-ENOMEM);
642         memset(pr, 0, sizeof(struct acpi_processor));
643
644         pr->handle = device->handle;
645         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
646         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
647         acpi_driver_data(device) = pr;
648
649         return_VALUE(0);
650 }
651
652 static int acpi_processor_remove(struct acpi_device *device, int type)
653 {
654         acpi_status status = AE_OK;
655         struct acpi_processor *pr = NULL;
656
657         ACPI_FUNCTION_TRACE("acpi_processor_remove");
658
659         if (!device || !acpi_driver_data(device))
660                 return_VALUE(-EINVAL);
661
662         pr = (struct acpi_processor *)acpi_driver_data(device);
663
664         if (pr->id >= NR_CPUS) {
665                 kfree(pr);
666                 return_VALUE(0);
667         }
668
669         if (type == ACPI_BUS_REMOVAL_EJECT) {
670                 if (acpi_processor_handle_eject(pr))
671                         return_VALUE(-EINVAL);
672         }
673
674         acpi_processor_power_exit(pr, device);
675
676         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
677                                             acpi_processor_notify);
678         if (ACPI_FAILURE(status)) {
679                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
680                                   "Error removing notify handler\n"));
681         }
682
683         acpi_processor_remove_fs(device);
684
685         processors[pr->id] = NULL;
686
687         kfree(pr);
688
689         return_VALUE(0);
690 }
691
692 #ifdef CONFIG_ACPI_HOTPLUG_CPU
693 /****************************************************************************
694  *      Acpi processor hotplug support                                      *
695  ****************************************************************************/
696
697 static int is_processor_present(acpi_handle handle);
698
699 static int is_processor_present(acpi_handle handle)
700 {
701         acpi_status status;
702         unsigned long sta = 0;
703
704         ACPI_FUNCTION_TRACE("is_processor_present");
705
706         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
707         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
708                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
709                                   "Processor Device is not present\n"));
710                 return_VALUE(0);
711         }
712         return_VALUE(1);
713 }
714
715 static
716 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
717 {
718         acpi_handle phandle;
719         struct acpi_device *pdev;
720         struct acpi_processor *pr;
721
722         ACPI_FUNCTION_TRACE("acpi_processor_device_add");
723
724         if (acpi_get_parent(handle, &phandle)) {
725                 return_VALUE(-ENODEV);
726         }
727
728         if (acpi_bus_get_device(phandle, &pdev)) {
729                 return_VALUE(-ENODEV);
730         }
731
732         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
733                 return_VALUE(-ENODEV);
734         }
735
736         acpi_bus_start(*device);
737
738         pr = acpi_driver_data(*device);
739         if (!pr)
740                 return_VALUE(-ENODEV);
741
742         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
743                 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
744         }
745         return_VALUE(0);
746 }
747
748 static void
749 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
750 {
751         struct acpi_processor *pr;
752         struct acpi_device *device = NULL;
753         int result;
754
755         ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
756
757         switch (event) {
758         case ACPI_NOTIFY_BUS_CHECK:
759         case ACPI_NOTIFY_DEVICE_CHECK:
760                 printk("Processor driver received %s event\n",
761                        (event == ACPI_NOTIFY_BUS_CHECK) ?
762                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
763
764                 if (!is_processor_present(handle))
765                         break;
766
767                 if (acpi_bus_get_device(handle, &device)) {
768                         result = acpi_processor_device_add(handle, &device);
769                         if (result)
770                                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
771                                                   "Unable to add the device\n"));
772                         break;
773                 }
774
775                 pr = acpi_driver_data(device);
776                 if (!pr) {
777                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
778                                           "Driver data is NULL\n"));
779                         break;
780                 }
781
782                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
783                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
784                         break;
785                 }
786
787                 result = acpi_processor_start(device);
788                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
789                         kobject_uevent(&device->kobj, KOBJ_ONLINE);
790                 } else {
791                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
792                                           "Device [%s] failed to start\n",
793                                           acpi_device_bid(device)));
794                 }
795                 break;
796         case ACPI_NOTIFY_EJECT_REQUEST:
797                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
798                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
799
800                 if (acpi_bus_get_device(handle, &device)) {
801                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
802                                           "Device don't exist, dropping EJECT\n"));
803                         break;
804                 }
805                 pr = acpi_driver_data(device);
806                 if (!pr) {
807                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
808                                           "Driver data is NULL, dropping EJECT\n"));
809                         return_VOID;
810                 }
811
812                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
813                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
814                 break;
815         default:
816                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
817                                   "Unsupported event [0x%x]\n", event));
818                 break;
819         }
820
821         return_VOID;
822 }
823
824 static acpi_status
825 processor_walk_namespace_cb(acpi_handle handle,
826                             u32 lvl, void *context, void **rv)
827 {
828         acpi_status status;
829         int *action = context;
830         acpi_object_type type = 0;
831
832         status = acpi_get_type(handle, &type);
833         if (ACPI_FAILURE(status))
834                 return (AE_OK);
835
836         if (type != ACPI_TYPE_PROCESSOR)
837                 return (AE_OK);
838
839         switch (*action) {
840         case INSTALL_NOTIFY_HANDLER:
841                 acpi_install_notify_handler(handle,
842                                             ACPI_SYSTEM_NOTIFY,
843                                             acpi_processor_hotplug_notify,
844                                             NULL);
845                 break;
846         case UNINSTALL_NOTIFY_HANDLER:
847                 acpi_remove_notify_handler(handle,
848                                            ACPI_SYSTEM_NOTIFY,
849                                            acpi_processor_hotplug_notify);
850                 break;
851         default:
852                 break;
853         }
854
855         return (AE_OK);
856 }
857
858 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
859 {
860         ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
861
862         if (!is_processor_present(handle)) {
863                 return_VALUE(AE_ERROR);
864         }
865
866         if (acpi_map_lsapic(handle, p_cpu))
867                 return_VALUE(AE_ERROR);
868
869         if (arch_register_cpu(*p_cpu)) {
870                 acpi_unmap_lsapic(*p_cpu);
871                 return_VALUE(AE_ERROR);
872         }
873
874         return_VALUE(AE_OK);
875 }
876
877 static int acpi_processor_handle_eject(struct acpi_processor *pr)
878 {
879         if (cpu_online(pr->id)) {
880                 return (-EINVAL);
881         }
882         arch_unregister_cpu(pr->id);
883         acpi_unmap_lsapic(pr->id);
884         return (0);
885 }
886 #else
887 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
888 {
889         return AE_ERROR;
890 }
891 static int acpi_processor_handle_eject(struct acpi_processor *pr)
892 {
893         return (-EINVAL);
894 }
895 #endif
896
897 static
898 void acpi_processor_install_hotplug_notify(void)
899 {
900 #ifdef CONFIG_ACPI_HOTPLUG_CPU
901         int action = INSTALL_NOTIFY_HANDLER;
902         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
903                             ACPI_ROOT_OBJECT,
904                             ACPI_UINT32_MAX,
905                             processor_walk_namespace_cb, &action, NULL);
906 #endif
907 }
908
909 static
910 void acpi_processor_uninstall_hotplug_notify(void)
911 {
912 #ifdef CONFIG_ACPI_HOTPLUG_CPU
913         int action = UNINSTALL_NOTIFY_HANDLER;
914         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
915                             ACPI_ROOT_OBJECT,
916                             ACPI_UINT32_MAX,
917                             processor_walk_namespace_cb, &action, NULL);
918 #endif
919 }
920
921 /*
922  * We keep the driver loaded even when ACPI is not running.
923  * This is needed for the powernow-k8 driver, that works even without
924  * ACPI, but needs symbols from this driver
925  */
926
927 static int __init acpi_processor_init(void)
928 {
929         int result = 0;
930
931         ACPI_FUNCTION_TRACE("acpi_processor_init");
932
933         memset(&processors, 0, sizeof(processors));
934         memset(&errata, 0, sizeof(errata));
935
936         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
937         if (!acpi_processor_dir)
938                 return_VALUE(0);
939         acpi_processor_dir->owner = THIS_MODULE;
940
941         result = acpi_bus_register_driver(&acpi_processor_driver);
942         if (result < 0) {
943                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
944                 return_VALUE(0);
945         }
946
947         acpi_processor_install_hotplug_notify();
948
949         acpi_thermal_cpufreq_init();
950
951         acpi_processor_ppc_init();
952
953         return_VALUE(0);
954 }
955
956 static void __exit acpi_processor_exit(void)
957 {
958         ACPI_FUNCTION_TRACE("acpi_processor_exit");
959
960         acpi_processor_ppc_exit();
961
962         acpi_thermal_cpufreq_exit();
963
964         acpi_processor_uninstall_hotplug_notify();
965
966         acpi_bus_unregister_driver(&acpi_processor_driver);
967
968         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
969
970         return_VOID;
971 }
972
973 module_init(acpi_processor_init);
974 module_exit(acpi_processor_exit);
975
976 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
977
978 MODULE_ALIAS("processor");