ACPI: delete tracing macros from drivers/acpi/*.c
[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
126         if (!dev)
127                 return -EINVAL;
128
129         /*
130          * Note that 'dev' references the PIIX4 ACPI Controller.
131          */
132
133         pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
134
135         switch (rev) {
136         case 0:
137                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
138                 break;
139         case 1:
140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
141                 break;
142         case 2:
143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
144                 break;
145         case 3:
146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
147                 break;
148         default:
149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
150                 break;
151         }
152
153         switch (rev) {
154
155         case 0:         /* PIIX4 A-step */
156         case 1:         /* PIIX4 B-step */
157                 /*
158                  * See specification changes #13 ("Manual Throttle Duty Cycle")
159                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
160                  * erratum #5 ("STPCLK# Deassertion Time") from the January
161                  * 2002 PIIX4 specification update.  Applies to only older
162                  * PIIX4 models.
163                  */
164                 errata.piix4.throttle = 1;
165
166         case 2:         /* PIIX4E */
167         case 3:         /* PIIX4M */
168                 /*
169                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
170                  * Livelock") from the January 2002 PIIX4 specification update.
171                  * Applies to all PIIX4 models.
172                  */
173
174                 /*
175                  * BM-IDE
176                  * ------
177                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
178                  * Status register address.  We'll use this later to read
179                  * each IDE controller's DMA status to make sure we catch all
180                  * DMA activity.
181                  */
182                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
183                                      PCI_DEVICE_ID_INTEL_82371AB,
184                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
185                 if (dev) {
186                         errata.piix4.bmisx = pci_resource_start(dev, 4);
187                         pci_dev_put(dev);
188                 }
189
190                 /*
191                  * Type-F DMA
192                  * ----------
193                  * Find the PIIX4 ISA Controller and read the Motherboard
194                  * DMA controller's status to see if Type-F (Fast) DMA mode
195                  * is enabled (bit 7) on either channel.  Note that we'll
196                  * disable C3 support if this is enabled, as some legacy
197                  * devices won't operate well if fast DMA is disabled.
198                  */
199                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
200                                      PCI_DEVICE_ID_INTEL_82371AB_0,
201                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
202                 if (dev) {
203                         pci_read_config_byte(dev, 0x76, &value1);
204                         pci_read_config_byte(dev, 0x77, &value2);
205                         if ((value1 & 0x80) || (value2 & 0x80))
206                                 errata.piix4.fdma = 1;
207                         pci_dev_put(dev);
208                 }
209
210                 break;
211         }
212
213         if (errata.piix4.bmisx)
214                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
215                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
216         if (errata.piix4.fdma)
217                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
218                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
219
220         return 0;
221 }
222
223 static int acpi_processor_errata(struct acpi_processor *pr)
224 {
225         int result = 0;
226         struct pci_dev *dev = NULL;
227
228
229         if (!pr)
230                 return -EINVAL;
231
232         /*
233          * PIIX4
234          */
235         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
236                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
237                              PCI_ANY_ID, NULL);
238         if (dev) {
239                 result = acpi_processor_errata_piix4(dev);
240                 pci_dev_put(dev);
241         }
242
243         return result;
244 }
245
246 /* --------------------------------------------------------------------------
247                               Common ACPI processor functions
248    -------------------------------------------------------------------------- */
249
250 /*
251  * _PDC is required for a BIOS-OS handshake for most of the newer
252  * ACPI processor features.
253  */
254 static int acpi_processor_set_pdc(struct acpi_processor *pr)
255 {
256         struct acpi_object_list *pdc_in = pr->pdc;
257         acpi_status status = AE_OK;
258
259
260         if (!pdc_in)
261                 return status;
262
263         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
264
265         if (ACPI_FAILURE(status))
266                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
267                     "Could not evaluate _PDC, using legacy perf. control...\n"));
268
269         return status;
270 }
271
272 /* --------------------------------------------------------------------------
273                               FS Interface (/proc)
274    -------------------------------------------------------------------------- */
275
276 static struct proc_dir_entry *acpi_processor_dir = NULL;
277
278 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
279 {
280         struct acpi_processor *pr = (struct acpi_processor *)seq->private;
281
282
283         if (!pr)
284                 goto end;
285
286         seq_printf(seq, "processor id:            %d\n"
287                    "acpi id:                 %d\n"
288                    "bus mastering control:   %s\n"
289                    "power management:        %s\n"
290                    "throttling control:      %s\n"
291                    "limit interface:         %s\n",
292                    pr->id,
293                    pr->acpi_id,
294                    pr->flags.bm_control ? "yes" : "no",
295                    pr->flags.power ? "yes" : "no",
296                    pr->flags.throttling ? "yes" : "no",
297                    pr->flags.limit ? "yes" : "no");
298
299       end:
300         return 0;
301 }
302
303 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
304 {
305         return single_open(file, acpi_processor_info_seq_show,
306                            PDE(inode)->data);
307 }
308
309 static int acpi_processor_add_fs(struct acpi_device *device)
310 {
311         struct proc_dir_entry *entry = NULL;
312
313
314         if (!acpi_device_dir(device)) {
315                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
316                                                      acpi_processor_dir);
317                 if (!acpi_device_dir(device))
318                         return -ENODEV;
319         }
320         acpi_device_dir(device)->owner = THIS_MODULE;
321
322         /* 'info' [R] */
323         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
324                                   S_IRUGO, acpi_device_dir(device));
325         if (!entry)
326                 return -EIO;
327         else {
328                 entry->proc_fops = &acpi_processor_info_fops;
329                 entry->data = acpi_driver_data(device);
330                 entry->owner = THIS_MODULE;
331         }
332
333         /* 'throttling' [R/W] */
334         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
335                                   S_IFREG | S_IRUGO | S_IWUSR,
336                                   acpi_device_dir(device));
337         if (!entry)
338                 return -EIO;
339         else {
340                 entry->proc_fops = &acpi_processor_throttling_fops;
341                 entry->data = acpi_driver_data(device);
342                 entry->owner = THIS_MODULE;
343         }
344
345         /* 'limit' [R/W] */
346         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
347                                   S_IFREG | S_IRUGO | S_IWUSR,
348                                   acpi_device_dir(device));
349         if (!entry)
350                 return -EIO;
351         else {
352                 entry->proc_fops = &acpi_processor_limit_fops;
353                 entry->data = acpi_driver_data(device);
354                 entry->owner = THIS_MODULE;
355         }
356
357         return 0;
358 }
359
360 static int acpi_processor_remove_fs(struct acpi_device *device)
361 {
362
363         if (acpi_device_dir(device)) {
364                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
365                                   acpi_device_dir(device));
366                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
367                                   acpi_device_dir(device));
368                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
369                                   acpi_device_dir(device));
370                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
371                 acpi_device_dir(device) = NULL;
372         }
373
374         return 0;
375 }
376
377 /* Use the acpiid in MADT to map cpus in case of SMP */
378 #ifndef CONFIG_SMP
379 #define convert_acpiid_to_cpu(acpi_id) (-1)
380 #else
381
382 #ifdef CONFIG_IA64
383 #define arch_acpiid_to_apicid   ia64_acpiid_to_sapicid
384 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
385 #define ARCH_BAD_APICID         (0xffff)
386 #else
387 #define arch_acpiid_to_apicid   x86_acpiid_to_apicid
388 #define arch_cpu_to_apicid      x86_cpu_to_apicid
389 #define ARCH_BAD_APICID         (0xff)
390 #endif
391
392 static int convert_acpiid_to_cpu(u8 acpi_id)
393 {
394         u16 apic_id;
395         int i;
396
397         apic_id = arch_acpiid_to_apicid[acpi_id];
398         if (apic_id == ARCH_BAD_APICID)
399                 return -1;
400
401         for (i = 0; i < NR_CPUS; i++) {
402                 if (arch_cpu_to_apicid[i] == apic_id)
403                         return i;
404         }
405         return -1;
406 }
407 #endif
408
409 /* --------------------------------------------------------------------------
410                                  Driver Interface
411    -------------------------------------------------------------------------- */
412
413 static int acpi_processor_get_info(struct acpi_processor *pr)
414 {
415         acpi_status status = 0;
416         union acpi_object object = { 0 };
417         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
418         int cpu_index;
419         static int cpu0_initialized;
420
421
422         if (!pr)
423                 return -EINVAL;
424
425         if (num_online_cpus() > 1)
426                 errata.smp = TRUE;
427
428         acpi_processor_errata(pr);
429
430         /*
431          * Check to see if we have bus mastering arbitration control.  This
432          * is required for proper C3 usage (to maintain cache coherency).
433          */
434         if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
435                 pr->flags.bm_control = 1;
436                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
437                                   "Bus mastering arbitration control present\n"));
438         } else
439                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
440                                   "No bus mastering arbitration control\n"));
441
442         /*
443          * Evalute the processor object.  Note that it is common on SMP to
444          * have the first (boot) processor with a valid PBLK address while
445          * all others have a NULL address.
446          */
447         status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
448         if (ACPI_FAILURE(status)) {
449                 printk(KERN_ERR PREFIX "Evaluating processor object\n");
450                 return -ENODEV;
451         }
452
453         /*
454          * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
455          *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
456          */
457         pr->acpi_id = object.processor.proc_id;
458
459         cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
460
461         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
462         if (!cpu0_initialized && (cpu_index == -1) &&
463             (num_online_cpus() == 1)) {
464                 cpu_index = 0;
465         }
466
467         cpu0_initialized = 1;
468
469         pr->id = cpu_index;
470
471         /*
472          *  Extra Processor objects may be enumerated on MP systems with
473          *  less than the max # of CPUs. They should be ignored _iff
474          *  they are physically not present.
475          */
476         if (cpu_index == -1) {
477                 if (ACPI_FAILURE
478                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
479                         printk(KERN_ERR PREFIX
480                                     "Getting cpuindex for acpiid 0x%x\n",
481                                     pr->acpi_id);
482                         return -ENODEV;
483                 }
484         }
485
486         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
487                           pr->acpi_id));
488
489         if (!object.processor.pblk_address)
490                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
491         else if (object.processor.pblk_length != 6)
492                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
493                             object.processor.pblk_length);
494         else {
495                 pr->throttling.address = object.processor.pblk_address;
496                 pr->throttling.duty_offset = acpi_fadt.duty_offset;
497                 pr->throttling.duty_width = acpi_fadt.duty_width;
498
499                 pr->pblk = object.processor.pblk_address;
500
501                 /*
502                  * We don't care about error returns - we just try to mark
503                  * these reserved so that nobody else is confused into thinking
504                  * that this region might be unused..
505                  *
506                  * (In particular, allocating the IO range for Cardbus)
507                  */
508                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
509         }
510
511 #ifdef CONFIG_CPU_FREQ
512         acpi_processor_ppc_has_changed(pr);
513 #endif
514         acpi_processor_get_throttling_info(pr);
515         acpi_processor_get_limit_info(pr);
516
517         return 0;
518 }
519
520 static void *processor_device_array[NR_CPUS];
521
522 static int acpi_processor_start(struct acpi_device *device)
523 {
524         int result = 0;
525         acpi_status status = AE_OK;
526         struct acpi_processor *pr;
527
528
529         pr = acpi_driver_data(device);
530
531         result = acpi_processor_get_info(pr);
532         if (result) {
533                 /* Processor is physically not present */
534                 return 0;
535         }
536
537         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
538
539         /*
540          * Buggy BIOS check
541          * ACPI id of processors can be reported wrongly by the BIOS.
542          * Don't trust it blindly
543          */
544         if (processor_device_array[pr->id] != NULL &&
545             processor_device_array[pr->id] != (void *)device) {
546                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
547                         "for the processor\n");
548                 return -ENODEV;
549         }
550         processor_device_array[pr->id] = (void *)device;
551
552         processors[pr->id] = pr;
553
554         result = acpi_processor_add_fs(device);
555         if (result)
556                 goto end;
557
558         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
559                                              acpi_processor_notify, pr);
560
561         /* _PDC call should be done before doing anything else (if reqd.). */
562         arch_acpi_processor_init_pdc(pr);
563         acpi_processor_set_pdc(pr);
564
565         acpi_processor_power_init(pr, device);
566
567         if (pr->flags.throttling) {
568                 printk(KERN_INFO PREFIX "%s [%s] (supports",
569                        acpi_device_name(device), acpi_device_bid(device));
570                 printk(" %d throttling states", pr->throttling.state_count);
571                 printk(")\n");
572         }
573
574       end:
575
576         return result;
577 }
578
579 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
580 {
581         struct acpi_processor *pr = (struct acpi_processor *)data;
582         struct acpi_device *device = NULL;
583
584
585         if (!pr)
586                 return;
587
588         if (acpi_bus_get_device(pr->handle, &device))
589                 return;
590
591         switch (event) {
592         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
593                 acpi_processor_ppc_has_changed(pr);
594                 acpi_bus_generate_event(device, event,
595                                         pr->performance_platform_limit);
596                 break;
597         case ACPI_PROCESSOR_NOTIFY_POWER:
598                 acpi_processor_cst_has_changed(pr);
599                 acpi_bus_generate_event(device, event, 0);
600                 break;
601         default:
602                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
603                                   "Unsupported event [0x%x]\n", event));
604                 break;
605         }
606
607         return;
608 }
609
610 static int acpi_processor_add(struct acpi_device *device)
611 {
612         struct acpi_processor *pr = NULL;
613
614
615         if (!device)
616                 return -EINVAL;
617
618         pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
619         if (!pr)
620                 return -ENOMEM;
621         memset(pr, 0, sizeof(struct acpi_processor));
622
623         pr->handle = device->handle;
624         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
625         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
626         acpi_driver_data(device) = pr;
627
628         return 0;
629 }
630
631 static int acpi_processor_remove(struct acpi_device *device, int type)
632 {
633         acpi_status status = AE_OK;
634         struct acpi_processor *pr = NULL;
635
636
637         if (!device || !acpi_driver_data(device))
638                 return -EINVAL;
639
640         pr = (struct acpi_processor *)acpi_driver_data(device);
641
642         if (pr->id >= NR_CPUS) {
643                 kfree(pr);
644                 return 0;
645         }
646
647         if (type == ACPI_BUS_REMOVAL_EJECT) {
648                 if (acpi_processor_handle_eject(pr))
649                         return -EINVAL;
650         }
651
652         acpi_processor_power_exit(pr, device);
653
654         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
655                                             acpi_processor_notify);
656
657         acpi_processor_remove_fs(device);
658
659         processors[pr->id] = NULL;
660
661         kfree(pr);
662
663         return 0;
664 }
665
666 #ifdef CONFIG_ACPI_HOTPLUG_CPU
667 /****************************************************************************
668  *      Acpi processor hotplug support                                      *
669  ****************************************************************************/
670
671 static int is_processor_present(acpi_handle handle);
672
673 static int is_processor_present(acpi_handle handle)
674 {
675         acpi_status status;
676         unsigned long sta = 0;
677
678
679         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
680         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
681                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
682                 return 0;
683         }
684         return 1;
685 }
686
687 static
688 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
689 {
690         acpi_handle phandle;
691         struct acpi_device *pdev;
692         struct acpi_processor *pr;
693
694
695         if (acpi_get_parent(handle, &phandle)) {
696                 return -ENODEV;
697         }
698
699         if (acpi_bus_get_device(phandle, &pdev)) {
700                 return -ENODEV;
701         }
702
703         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
704                 return -ENODEV;
705         }
706
707         acpi_bus_start(*device);
708
709         pr = acpi_driver_data(*device);
710         if (!pr)
711                 return -ENODEV;
712
713         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
714                 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
715         }
716         return 0;
717 }
718
719 static void
720 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
721 {
722         struct acpi_processor *pr;
723         struct acpi_device *device = NULL;
724         int result;
725
726
727         switch (event) {
728         case ACPI_NOTIFY_BUS_CHECK:
729         case ACPI_NOTIFY_DEVICE_CHECK:
730                 printk("Processor driver received %s event\n",
731                        (event == ACPI_NOTIFY_BUS_CHECK) ?
732                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
733
734                 if (!is_processor_present(handle))
735                         break;
736
737                 if (acpi_bus_get_device(handle, &device)) {
738                         result = acpi_processor_device_add(handle, &device);
739                         if (result)
740                                 printk(KERN_ERR PREFIX
741                                             "Unable to add the device\n");
742                         break;
743                 }
744
745                 pr = acpi_driver_data(device);
746                 if (!pr) {
747                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
748                         break;
749                 }
750
751                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
752                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
753                         break;
754                 }
755
756                 result = acpi_processor_start(device);
757                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
758                         kobject_uevent(&device->kobj, KOBJ_ONLINE);
759                 } else {
760                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
761                                     acpi_device_bid(device));
762                 }
763                 break;
764         case ACPI_NOTIFY_EJECT_REQUEST:
765                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
766                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
767
768                 if (acpi_bus_get_device(handle, &device)) {
769                         printk(KERN_ERR PREFIX
770                                     "Device don't exist, dropping EJECT\n");
771                         break;
772                 }
773                 pr = acpi_driver_data(device);
774                 if (!pr) {
775                         printk(KERN_ERR PREFIX
776                                     "Driver data is NULL, dropping EJECT\n");
777                         return;
778                 }
779
780                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
781                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
782                 break;
783         default:
784                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
785                                   "Unsupported event [0x%x]\n", event));
786                 break;
787         }
788
789         return;
790 }
791
792 static acpi_status
793 processor_walk_namespace_cb(acpi_handle handle,
794                             u32 lvl, void *context, void **rv)
795 {
796         acpi_status status;
797         int *action = context;
798         acpi_object_type type = 0;
799
800         status = acpi_get_type(handle, &type);
801         if (ACPI_FAILURE(status))
802                 return (AE_OK);
803
804         if (type != ACPI_TYPE_PROCESSOR)
805                 return (AE_OK);
806
807         switch (*action) {
808         case INSTALL_NOTIFY_HANDLER:
809                 acpi_install_notify_handler(handle,
810                                             ACPI_SYSTEM_NOTIFY,
811                                             acpi_processor_hotplug_notify,
812                                             NULL);
813                 break;
814         case UNINSTALL_NOTIFY_HANDLER:
815                 acpi_remove_notify_handler(handle,
816                                            ACPI_SYSTEM_NOTIFY,
817                                            acpi_processor_hotplug_notify);
818                 break;
819         default:
820                 break;
821         }
822
823         return (AE_OK);
824 }
825
826 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
827 {
828
829         if (!is_processor_present(handle)) {
830                 return AE_ERROR;
831         }
832
833         if (acpi_map_lsapic(handle, p_cpu))
834                 return AE_ERROR;
835
836         if (arch_register_cpu(*p_cpu)) {
837                 acpi_unmap_lsapic(*p_cpu);
838                 return AE_ERROR;
839         }
840
841         return AE_OK;
842 }
843
844 static int acpi_processor_handle_eject(struct acpi_processor *pr)
845 {
846         if (cpu_online(pr->id)) {
847                 return (-EINVAL);
848         }
849         arch_unregister_cpu(pr->id);
850         acpi_unmap_lsapic(pr->id);
851         return (0);
852 }
853 #else
854 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
855 {
856         return AE_ERROR;
857 }
858 static int acpi_processor_handle_eject(struct acpi_processor *pr)
859 {
860         return (-EINVAL);
861 }
862 #endif
863
864 static
865 void acpi_processor_install_hotplug_notify(void)
866 {
867 #ifdef CONFIG_ACPI_HOTPLUG_CPU
868         int action = INSTALL_NOTIFY_HANDLER;
869         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
870                             ACPI_ROOT_OBJECT,
871                             ACPI_UINT32_MAX,
872                             processor_walk_namespace_cb, &action, NULL);
873 #endif
874 }
875
876 static
877 void acpi_processor_uninstall_hotplug_notify(void)
878 {
879 #ifdef CONFIG_ACPI_HOTPLUG_CPU
880         int action = UNINSTALL_NOTIFY_HANDLER;
881         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
882                             ACPI_ROOT_OBJECT,
883                             ACPI_UINT32_MAX,
884                             processor_walk_namespace_cb, &action, NULL);
885 #endif
886 }
887
888 /*
889  * We keep the driver loaded even when ACPI is not running.
890  * This is needed for the powernow-k8 driver, that works even without
891  * ACPI, but needs symbols from this driver
892  */
893
894 static int __init acpi_processor_init(void)
895 {
896         int result = 0;
897
898
899         memset(&processors, 0, sizeof(processors));
900         memset(&errata, 0, sizeof(errata));
901
902         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
903         if (!acpi_processor_dir)
904                 return 0;
905         acpi_processor_dir->owner = THIS_MODULE;
906
907         result = acpi_bus_register_driver(&acpi_processor_driver);
908         if (result < 0) {
909                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
910                 return 0;
911         }
912
913         acpi_processor_install_hotplug_notify();
914
915         acpi_thermal_cpufreq_init();
916
917         acpi_processor_ppc_init();
918
919         return 0;
920 }
921
922 static void __exit acpi_processor_exit(void)
923 {
924
925         acpi_processor_ppc_exit();
926
927         acpi_thermal_cpufreq_exit();
928
929         acpi_processor_uninstall_hotplug_notify();
930
931         acpi_bus_unregister_driver(&acpi_processor_driver);
932
933         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
934
935         return;
936 }
937
938 module_init(acpi_processor_init);
939 module_exit(acpi_processor_exit);
940
941 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
942
943 MODULE_ALIAS("processor");