proper prototype for acpi_processor_tstate_has_changed()
[linux-2.6.git] / drivers / acpi / processor_core.c
1 /*
2  * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
7  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8  *                      - Added processor hotplug support
9  *
10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11  *
12  *  This program is free software; you can redistribute it and/or modify
13  *  it under the terms of the GNU General Public License as published by
14  *  the Free Software Foundation; either version 2 of the License, or (at
15  *  your option) any later version.
16  *
17  *  This program is distributed in the hope that it will be useful, but
18  *  WITHOUT ANY WARRANTY; without even the implied warranty of
19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
20  *  General Public License for more details.
21  *
22  *  You should have received a copy of the GNU General Public License along
23  *  with this program; if not, write to the Free Software Foundation, Inc.,
24  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25  *
26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27  *  TBD:
28  *      1. Make # power states dynamic.
29  *      2. Support duty_cycle values that span bit 4.
30  *      3. Optimize by having scheduler determine business instead of
31  *         having us try to calculate it here.
32  *      4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
33  */
34
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/types.h>
39 #include <linux/pci.h>
40 #include <linux/pm.h>
41 #include <linux/cpufreq.h>
42 #include <linux/cpu.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/dmi.h>
46 #include <linux/moduleparam.h>
47 #include <linux/cpuidle.h>
48
49 #include <asm/io.h>
50 #include <asm/system.h>
51 #include <asm/cpu.h>
52 #include <asm/delay.h>
53 #include <asm/uaccess.h>
54 #include <asm/processor.h>
55 #include <asm/smp.h>
56 #include <asm/acpi.h>
57
58 #include <acpi/acpi_bus.h>
59 #include <acpi/acpi_drivers.h>
60 #include <acpi/processor.h>
61
62 #define ACPI_PROCESSOR_COMPONENT        0x01000000
63 #define ACPI_PROCESSOR_CLASS            "processor"
64 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
65 #define ACPI_PROCESSOR_FILE_INFO        "info"
66 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
67 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
69 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
70 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
71
72 #define ACPI_PROCESSOR_LIMIT_USER       0
73 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
74
75 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
76 ACPI_MODULE_NAME("processor_core");
77
78 MODULE_AUTHOR("Paul Diefenbaugh");
79 MODULE_DESCRIPTION("ACPI Processor Driver");
80 MODULE_LICENSE("GPL");
81
82 static int acpi_processor_add(struct acpi_device *device);
83 static int acpi_processor_start(struct acpi_device *device);
84 static int acpi_processor_remove(struct acpi_device *device, int type);
85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
86 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
87 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
88 static int acpi_processor_handle_eject(struct acpi_processor *pr);
89
90
91 static const struct acpi_device_id processor_device_ids[] = {
92         {ACPI_PROCESSOR_HID, 0},
93         {"", 0},
94 };
95 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
96
97 static struct acpi_driver acpi_processor_driver = {
98         .name = "processor",
99         .class = ACPI_PROCESSOR_CLASS,
100         .ids = processor_device_ids,
101         .ops = {
102                 .add = acpi_processor_add,
103                 .remove = acpi_processor_remove,
104                 .start = acpi_processor_start,
105                 .suspend = acpi_processor_suspend,
106                 .resume = acpi_processor_resume,
107                 },
108 };
109
110 #define INSTALL_NOTIFY_HANDLER          1
111 #define UNINSTALL_NOTIFY_HANDLER        2
112
113 static const struct file_operations acpi_processor_info_fops = {
114         .owner = THIS_MODULE,
115         .open = acpi_processor_info_open_fs,
116         .read = seq_read,
117         .llseek = seq_lseek,
118         .release = single_release,
119 };
120
121 struct acpi_processor *processors[NR_CPUS];
122 struct acpi_processor_errata errata __read_mostly;
123
124 /* --------------------------------------------------------------------------
125                                 Errata Handling
126    -------------------------------------------------------------------------- */
127
128 static int acpi_processor_errata_piix4(struct pci_dev *dev)
129 {
130         u8 value1 = 0;
131         u8 value2 = 0;
132
133
134         if (!dev)
135                 return -EINVAL;
136
137         /*
138          * Note that 'dev' references the PIIX4 ACPI Controller.
139          */
140
141         switch (dev->revision) {
142         case 0:
143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
144                 break;
145         case 1:
146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
147                 break;
148         case 2:
149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
150                 break;
151         case 3:
152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
153                 break;
154         default:
155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
156                 break;
157         }
158
159         switch (dev->revision) {
160
161         case 0:         /* PIIX4 A-step */
162         case 1:         /* PIIX4 B-step */
163                 /*
164                  * See specification changes #13 ("Manual Throttle Duty Cycle")
165                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
166                  * erratum #5 ("STPCLK# Deassertion Time") from the January
167                  * 2002 PIIX4 specification update.  Applies to only older
168                  * PIIX4 models.
169                  */
170                 errata.piix4.throttle = 1;
171
172         case 2:         /* PIIX4E */
173         case 3:         /* PIIX4M */
174                 /*
175                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
176                  * Livelock") from the January 2002 PIIX4 specification update.
177                  * Applies to all PIIX4 models.
178                  */
179
180                 /*
181                  * BM-IDE
182                  * ------
183                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
184                  * Status register address.  We'll use this later to read
185                  * each IDE controller's DMA status to make sure we catch all
186                  * DMA activity.
187                  */
188                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
189                                      PCI_DEVICE_ID_INTEL_82371AB,
190                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
191                 if (dev) {
192                         errata.piix4.bmisx = pci_resource_start(dev, 4);
193                         pci_dev_put(dev);
194                 }
195
196                 /*
197                  * Type-F DMA
198                  * ----------
199                  * Find the PIIX4 ISA Controller and read the Motherboard
200                  * DMA controller's status to see if Type-F (Fast) DMA mode
201                  * is enabled (bit 7) on either channel.  Note that we'll
202                  * disable C3 support if this is enabled, as some legacy
203                  * devices won't operate well if fast DMA is disabled.
204                  */
205                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
206                                      PCI_DEVICE_ID_INTEL_82371AB_0,
207                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
208                 if (dev) {
209                         pci_read_config_byte(dev, 0x76, &value1);
210                         pci_read_config_byte(dev, 0x77, &value2);
211                         if ((value1 & 0x80) || (value2 & 0x80))
212                                 errata.piix4.fdma = 1;
213                         pci_dev_put(dev);
214                 }
215
216                 break;
217         }
218
219         if (errata.piix4.bmisx)
220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
221                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
222         if (errata.piix4.fdma)
223                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
224                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
225
226         return 0;
227 }
228
229 static int acpi_processor_errata(struct acpi_processor *pr)
230 {
231         int result = 0;
232         struct pci_dev *dev = NULL;
233
234
235         if (!pr)
236                 return -EINVAL;
237
238         /*
239          * PIIX4
240          */
241         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
242                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
243                              PCI_ANY_ID, NULL);
244         if (dev) {
245                 result = acpi_processor_errata_piix4(dev);
246                 pci_dev_put(dev);
247         }
248
249         return result;
250 }
251
252 /* --------------------------------------------------------------------------
253                               Common ACPI processor functions
254    -------------------------------------------------------------------------- */
255
256 /*
257  * _PDC is required for a BIOS-OS handshake for most of the newer
258  * ACPI processor features.
259  */
260 static int acpi_processor_set_pdc(struct acpi_processor *pr)
261 {
262         struct acpi_object_list *pdc_in = pr->pdc;
263         acpi_status status = AE_OK;
264
265
266         if (!pdc_in)
267                 return status;
268
269         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
270
271         if (ACPI_FAILURE(status))
272                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
273                     "Could not evaluate _PDC, using legacy perf. control...\n"));
274
275         return status;
276 }
277
278 /* --------------------------------------------------------------------------
279                               FS Interface (/proc)
280    -------------------------------------------------------------------------- */
281
282 static struct proc_dir_entry *acpi_processor_dir = NULL;
283
284 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
285 {
286         struct acpi_processor *pr = seq->private;
287
288
289         if (!pr)
290                 goto end;
291
292         seq_printf(seq, "processor id:            %d\n"
293                    "acpi id:                 %d\n"
294                    "bus mastering control:   %s\n"
295                    "power management:        %s\n"
296                    "throttling control:      %s\n"
297                    "limit interface:         %s\n",
298                    pr->id,
299                    pr->acpi_id,
300                    pr->flags.bm_control ? "yes" : "no",
301                    pr->flags.power ? "yes" : "no",
302                    pr->flags.throttling ? "yes" : "no",
303                    pr->flags.limit ? "yes" : "no");
304
305       end:
306         return 0;
307 }
308
309 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
310 {
311         return single_open(file, acpi_processor_info_seq_show,
312                            PDE(inode)->data);
313 }
314
315 static int acpi_processor_add_fs(struct acpi_device *device)
316 {
317         struct proc_dir_entry *entry = NULL;
318
319
320         if (!acpi_device_dir(device)) {
321                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
322                                                      acpi_processor_dir);
323                 if (!acpi_device_dir(device))
324                         return -ENODEV;
325         }
326         acpi_device_dir(device)->owner = THIS_MODULE;
327
328         /* 'info' [R] */
329         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
330                                  S_IRUGO, acpi_device_dir(device),
331                                  &acpi_processor_info_fops,
332                                  acpi_driver_data(device));
333         if (!entry)
334                 return -EIO;
335
336         /* 'throttling' [R/W] */
337         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
338                                  S_IFREG | S_IRUGO | S_IWUSR,
339                                  acpi_device_dir(device),
340                                  &acpi_processor_throttling_fops,
341                                  acpi_driver_data(device));
342         if (!entry)
343                 return -EIO;
344
345         /* 'limit' [R/W] */
346         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
347                                  S_IFREG | S_IRUGO | S_IWUSR,
348                                  acpi_device_dir(device),
349                                  &acpi_processor_limit_fops,
350                                  acpi_driver_data(device));
351         if (!entry)
352                 return -EIO;
353         return 0;
354 }
355
356 static int acpi_processor_remove_fs(struct acpi_device *device)
357 {
358
359         if (acpi_device_dir(device)) {
360                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
361                                   acpi_device_dir(device));
362                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
363                                   acpi_device_dir(device));
364                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
365                                   acpi_device_dir(device));
366                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
367                 acpi_device_dir(device) = NULL;
368         }
369
370         return 0;
371 }
372
373 /* Use the acpiid in MADT to map cpus in case of SMP */
374
375 #ifndef CONFIG_SMP
376 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
377 #else
378
379 static struct acpi_table_madt *madt;
380
381 static int map_lapic_id(struct acpi_subtable_header *entry,
382                  u32 acpi_id, int *apic_id)
383 {
384         struct acpi_madt_local_apic *lapic =
385                 (struct acpi_madt_local_apic *)entry;
386         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
387             lapic->processor_id == acpi_id) {
388                 *apic_id = lapic->id;
389                 return 1;
390         }
391         return 0;
392 }
393
394 static int map_lsapic_id(struct acpi_subtable_header *entry,
395                   u32 acpi_id, int *apic_id)
396 {
397         struct acpi_madt_local_sapic *lsapic =
398                 (struct acpi_madt_local_sapic *)entry;
399         /* Only check enabled APICs*/
400         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
401                 /* First check against id */
402                 if (lsapic->processor_id == acpi_id) {
403                         *apic_id = (lsapic->id << 8) | lsapic->eid;
404                         return 1;
405                 /* Check against optional uid */
406                 } else if (entry->length >= 16 &&
407                         lsapic->uid == acpi_id) {
408                         *apic_id = lsapic->uid;
409                         return 1;
410                 }
411         }
412         return 0;
413 }
414
415 static int map_madt_entry(u32 acpi_id)
416 {
417         unsigned long madt_end, entry;
418         int apic_id = -1;
419
420         if (!madt)
421                 return apic_id;
422
423         entry = (unsigned long)madt;
424         madt_end = entry + madt->header.length;
425
426         /* Parse all entries looking for a match. */
427
428         entry += sizeof(struct acpi_table_madt);
429         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
430                 struct acpi_subtable_header *header =
431                         (struct acpi_subtable_header *)entry;
432                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
433                         if (map_lapic_id(header, acpi_id, &apic_id))
434                                 break;
435                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
436                         if (map_lsapic_id(header, acpi_id, &apic_id))
437                                 break;
438                 }
439                 entry += header->length;
440         }
441         return apic_id;
442 }
443
444 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
445 {
446         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
447         union acpi_object *obj;
448         struct acpi_subtable_header *header;
449         int apic_id = -1;
450
451         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
452                 goto exit;
453
454         if (!buffer.length || !buffer.pointer)
455                 goto exit;
456
457         obj = buffer.pointer;
458         if (obj->type != ACPI_TYPE_BUFFER ||
459             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
460                 goto exit;
461         }
462
463         header = (struct acpi_subtable_header *)obj->buffer.pointer;
464         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
465                 map_lapic_id(header, acpi_id, &apic_id);
466         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
467                 map_lsapic_id(header, acpi_id, &apic_id);
468         }
469
470 exit:
471         if (buffer.pointer)
472                 kfree(buffer.pointer);
473         return apic_id;
474 }
475
476 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
477 {
478         int i;
479         int apic_id = -1;
480
481         apic_id = map_mat_entry(handle, acpi_id);
482         if (apic_id == -1)
483                 apic_id = map_madt_entry(acpi_id);
484         if (apic_id == -1)
485                 return apic_id;
486
487         for_each_possible_cpu(i) {
488                 if (cpu_physical_id(i) == apic_id)
489                         return i;
490         }
491         return -1;
492 }
493 #endif
494
495 /* --------------------------------------------------------------------------
496                                  Driver Interface
497    -------------------------------------------------------------------------- */
498
499 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
500 {
501         acpi_status status = 0;
502         union acpi_object object = { 0 };
503         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
504         int cpu_index;
505         static int cpu0_initialized;
506
507
508         if (!pr)
509                 return -EINVAL;
510
511         if (num_online_cpus() > 1)
512                 errata.smp = TRUE;
513
514         acpi_processor_errata(pr);
515
516         /*
517          * Check to see if we have bus mastering arbitration control.  This
518          * is required for proper C3 usage (to maintain cache coherency).
519          */
520         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
521                 pr->flags.bm_control = 1;
522                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
523                                   "Bus mastering arbitration control present\n"));
524         } else
525                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
526                                   "No bus mastering arbitration control\n"));
527
528         /* Check if it is a Device with HID and UID */
529         if (has_uid) {
530                 unsigned long value;
531                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
532                                                 NULL, &value);
533                 if (ACPI_FAILURE(status)) {
534                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
535                         return -ENODEV;
536                 }
537                 pr->acpi_id = value;
538         } else {
539                 /*
540                 * Evalute the processor object.  Note that it is common on SMP to
541                 * have the first (boot) processor with a valid PBLK address while
542                 * all others have a NULL address.
543                 */
544                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
545                 if (ACPI_FAILURE(status)) {
546                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
547                         return -ENODEV;
548                 }
549
550                 /*
551                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
552                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
553                 */
554                 pr->acpi_id = object.processor.proc_id;
555         }
556         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
557
558         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
559         if (!cpu0_initialized && (cpu_index == -1) &&
560             (num_online_cpus() == 1)) {
561                 cpu_index = 0;
562         }
563
564         cpu0_initialized = 1;
565
566         pr->id = cpu_index;
567
568         /*
569          *  Extra Processor objects may be enumerated on MP systems with
570          *  less than the max # of CPUs. They should be ignored _iff
571          *  they are physically not present.
572          */
573         if (pr->id == -1) {
574                 if (ACPI_FAILURE
575                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
576                         return -ENODEV;
577                 }
578         }
579
580         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
581                           pr->acpi_id));
582
583         if (!object.processor.pblk_address)
584                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
585         else if (object.processor.pblk_length != 6)
586                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
587                             object.processor.pblk_length);
588         else {
589                 pr->throttling.address = object.processor.pblk_address;
590                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
591                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
592
593                 pr->pblk = object.processor.pblk_address;
594
595                 /*
596                  * We don't care about error returns - we just try to mark
597                  * these reserved so that nobody else is confused into thinking
598                  * that this region might be unused..
599                  *
600                  * (In particular, allocating the IO range for Cardbus)
601                  */
602                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
603         }
604
605         /*
606          * If ACPI describes a slot number for this CPU, we can use it
607          * ensure we get the right value in the "physical id" field
608          * of /proc/cpuinfo
609          */
610         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
611         if (ACPI_SUCCESS(status))
612                 arch_fix_phys_package_id(pr->id, object.integer.value);
613
614         return 0;
615 }
616
617 static void *processor_device_array[NR_CPUS];
618
619 static int __cpuinit acpi_processor_start(struct acpi_device *device)
620 {
621         int result = 0;
622         acpi_status status = AE_OK;
623         struct acpi_processor *pr;
624
625
626         pr = acpi_driver_data(device);
627
628         result = acpi_processor_get_info(pr, device->flags.unique_id);
629         if (result) {
630                 /* Processor is physically not present */
631                 return 0;
632         }
633
634         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
635
636         /*
637          * Buggy BIOS check
638          * ACPI id of processors can be reported wrongly by the BIOS.
639          * Don't trust it blindly
640          */
641         if (processor_device_array[pr->id] != NULL &&
642             processor_device_array[pr->id] != device) {
643                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
644                         "for the processor\n");
645                 return -ENODEV;
646         }
647         processor_device_array[pr->id] = device;
648
649         processors[pr->id] = pr;
650
651         result = acpi_processor_add_fs(device);
652         if (result)
653                 goto end;
654
655         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
656                                              acpi_processor_notify, pr);
657
658         /* _PDC call should be done before doing anything else (if reqd.). */
659         arch_acpi_processor_init_pdc(pr);
660         acpi_processor_set_pdc(pr);
661 #ifdef CONFIG_CPU_FREQ
662         acpi_processor_ppc_has_changed(pr);
663 #endif
664         acpi_processor_get_throttling_info(pr);
665         acpi_processor_get_limit_info(pr);
666
667
668         acpi_processor_power_init(pr, device);
669
670         pr->cdev = thermal_cooling_device_register("Processor", device,
671                                                 &processor_cooling_ops);
672         if (IS_ERR(pr->cdev)) {
673                 result = PTR_ERR(pr->cdev);
674                 goto end;
675         }
676
677         printk(KERN_INFO PREFIX
678                 "%s is registered as cooling_device%d\n",
679                 device->dev.bus_id, pr->cdev->id);
680
681         result = sysfs_create_link(&device->dev.kobj,
682                                    &pr->cdev->device.kobj,
683                                    "thermal_cooling");
684         if (result)
685                 printk(KERN_ERR PREFIX "Create sysfs link\n");
686         result = sysfs_create_link(&pr->cdev->device.kobj,
687                                    &device->dev.kobj,
688                                    "device");
689         if (result)
690                 printk(KERN_ERR PREFIX "Create sysfs link\n");
691
692         if (pr->flags.throttling) {
693                 printk(KERN_INFO PREFIX "%s [%s] (supports",
694                        acpi_device_name(device), acpi_device_bid(device));
695                 printk(" %d throttling states", pr->throttling.state_count);
696                 printk(")\n");
697         }
698
699       end:
700
701         return result;
702 }
703
704 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
705 {
706         struct acpi_processor *pr = data;
707         struct acpi_device *device = NULL;
708         int saved;
709
710         if (!pr)
711                 return;
712
713         if (acpi_bus_get_device(pr->handle, &device))
714                 return;
715
716         switch (event) {
717         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
718                 saved = pr->performance_platform_limit;
719                 acpi_processor_ppc_has_changed(pr);
720                 if (saved == pr->performance_platform_limit)
721                         break;
722                 acpi_bus_generate_proc_event(device, event,
723                                         pr->performance_platform_limit);
724                 acpi_bus_generate_netlink_event(device->pnp.device_class,
725                                                   device->dev.bus_id, event,
726                                                   pr->performance_platform_limit);
727                 break;
728         case ACPI_PROCESSOR_NOTIFY_POWER:
729                 acpi_processor_cst_has_changed(pr);
730                 acpi_bus_generate_proc_event(device, event, 0);
731                 acpi_bus_generate_netlink_event(device->pnp.device_class,
732                                                   device->dev.bus_id, event, 0);
733                 break;
734         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
735                 acpi_processor_tstate_has_changed(pr);
736                 acpi_bus_generate_proc_event(device, event, 0);
737                 acpi_bus_generate_netlink_event(device->pnp.device_class,
738                                                   device->dev.bus_id, event, 0);
739         default:
740                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
741                                   "Unsupported event [0x%x]\n", event));
742                 break;
743         }
744
745         return;
746 }
747
748 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
749                 unsigned long action, void *hcpu)
750 {
751         unsigned int cpu = (unsigned long)hcpu;
752         struct acpi_processor *pr = processors[cpu];
753
754         if (action == CPU_ONLINE && pr) {
755                 acpi_processor_ppc_has_changed(pr);
756                 acpi_processor_cst_has_changed(pr);
757                 acpi_processor_tstate_has_changed(pr);
758         }
759         return NOTIFY_OK;
760 }
761
762 static struct notifier_block acpi_cpu_notifier =
763 {
764             .notifier_call = acpi_cpu_soft_notify,
765 };
766
767 static int acpi_processor_add(struct acpi_device *device)
768 {
769         struct acpi_processor *pr = NULL;
770
771
772         if (!device)
773                 return -EINVAL;
774
775         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
776         if (!pr)
777                 return -ENOMEM;
778
779         pr->handle = device->handle;
780         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
781         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
782         acpi_driver_data(device) = pr;
783
784         return 0;
785 }
786
787 static int acpi_processor_remove(struct acpi_device *device, int type)
788 {
789         acpi_status status = AE_OK;
790         struct acpi_processor *pr = NULL;
791
792
793         if (!device || !acpi_driver_data(device))
794                 return -EINVAL;
795
796         pr = acpi_driver_data(device);
797
798         if (pr->id >= nr_cpu_ids) {
799                 kfree(pr);
800                 return 0;
801         }
802
803         if (type == ACPI_BUS_REMOVAL_EJECT) {
804                 if (acpi_processor_handle_eject(pr))
805                         return -EINVAL;
806         }
807
808         acpi_processor_power_exit(pr, device);
809
810         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
811                                             acpi_processor_notify);
812
813         acpi_processor_remove_fs(device);
814
815         if (pr->cdev) {
816                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
817                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
818                 thermal_cooling_device_unregister(pr->cdev);
819                 pr->cdev = NULL;
820         }
821
822         processors[pr->id] = NULL;
823         processor_device_array[pr->id] = NULL;
824         kfree(pr);
825
826         return 0;
827 }
828
829 #ifdef CONFIG_ACPI_HOTPLUG_CPU
830 /****************************************************************************
831  *      Acpi processor hotplug support                                      *
832  ****************************************************************************/
833
834 static int is_processor_present(acpi_handle handle)
835 {
836         acpi_status status;
837         unsigned long sta = 0;
838
839
840         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
841
842         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
843                 return 1;
844
845         /*
846          * _STA is mandatory for a processor that supports hot plug
847          */
848         if (status == AE_NOT_FOUND)
849                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
850                                 "Processor does not support hot plug\n"));
851         else
852                 ACPI_EXCEPTION((AE_INFO, status,
853                                 "Processor Device is not present"));
854         return 0;
855 }
856
857 static
858 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
859 {
860         acpi_handle phandle;
861         struct acpi_device *pdev;
862         struct acpi_processor *pr;
863
864
865         if (acpi_get_parent(handle, &phandle)) {
866                 return -ENODEV;
867         }
868
869         if (acpi_bus_get_device(phandle, &pdev)) {
870                 return -ENODEV;
871         }
872
873         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
874                 return -ENODEV;
875         }
876
877         acpi_bus_start(*device);
878
879         pr = acpi_driver_data(*device);
880         if (!pr)
881                 return -ENODEV;
882
883         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
884                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
885         }
886         return 0;
887 }
888
889 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
890                                                 u32 event, void *data)
891 {
892         struct acpi_processor *pr;
893         struct acpi_device *device = NULL;
894         int result;
895
896
897         switch (event) {
898         case ACPI_NOTIFY_BUS_CHECK:
899         case ACPI_NOTIFY_DEVICE_CHECK:
900                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
901                 "Processor driver received %s event\n",
902                        (event == ACPI_NOTIFY_BUS_CHECK) ?
903                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
904
905                 if (!is_processor_present(handle))
906                         break;
907
908                 if (acpi_bus_get_device(handle, &device)) {
909                         result = acpi_processor_device_add(handle, &device);
910                         if (result)
911                                 printk(KERN_ERR PREFIX
912                                             "Unable to add the device\n");
913                         break;
914                 }
915
916                 pr = acpi_driver_data(device);
917                 if (!pr) {
918                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
919                         break;
920                 }
921
922                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
923                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
924                         break;
925                 }
926
927                 result = acpi_processor_start(device);
928                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
929                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
930                 } else {
931                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
932                                     acpi_device_bid(device));
933                 }
934                 break;
935         case ACPI_NOTIFY_EJECT_REQUEST:
936                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
937                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
938
939                 if (acpi_bus_get_device(handle, &device)) {
940                         printk(KERN_ERR PREFIX
941                                     "Device don't exist, dropping EJECT\n");
942                         break;
943                 }
944                 pr = acpi_driver_data(device);
945                 if (!pr) {
946                         printk(KERN_ERR PREFIX
947                                     "Driver data is NULL, dropping EJECT\n");
948                         return;
949                 }
950
951                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
952                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
953                 break;
954         default:
955                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
956                                   "Unsupported event [0x%x]\n", event));
957                 break;
958         }
959
960         return;
961 }
962
963 static acpi_status
964 processor_walk_namespace_cb(acpi_handle handle,
965                             u32 lvl, void *context, void **rv)
966 {
967         acpi_status status;
968         int *action = context;
969         acpi_object_type type = 0;
970
971         status = acpi_get_type(handle, &type);
972         if (ACPI_FAILURE(status))
973                 return (AE_OK);
974
975         if (type != ACPI_TYPE_PROCESSOR)
976                 return (AE_OK);
977
978         switch (*action) {
979         case INSTALL_NOTIFY_HANDLER:
980                 acpi_install_notify_handler(handle,
981                                             ACPI_SYSTEM_NOTIFY,
982                                             acpi_processor_hotplug_notify,
983                                             NULL);
984                 break;
985         case UNINSTALL_NOTIFY_HANDLER:
986                 acpi_remove_notify_handler(handle,
987                                            ACPI_SYSTEM_NOTIFY,
988                                            acpi_processor_hotplug_notify);
989                 break;
990         default:
991                 break;
992         }
993
994         return (AE_OK);
995 }
996
997 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
998 {
999
1000         if (!is_processor_present(handle)) {
1001                 return AE_ERROR;
1002         }
1003
1004         if (acpi_map_lsapic(handle, p_cpu))
1005                 return AE_ERROR;
1006
1007         if (arch_register_cpu(*p_cpu)) {
1008                 acpi_unmap_lsapic(*p_cpu);
1009                 return AE_ERROR;
1010         }
1011
1012         return AE_OK;
1013 }
1014
1015 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1016 {
1017         if (cpu_online(pr->id)) {
1018                 return (-EINVAL);
1019         }
1020         arch_unregister_cpu(pr->id);
1021         acpi_unmap_lsapic(pr->id);
1022         return (0);
1023 }
1024 #else
1025 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1026 {
1027         return AE_ERROR;
1028 }
1029 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1030 {
1031         return (-EINVAL);
1032 }
1033 #endif
1034
1035 static
1036 void acpi_processor_install_hotplug_notify(void)
1037 {
1038 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1039         int action = INSTALL_NOTIFY_HANDLER;
1040         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1041                             ACPI_ROOT_OBJECT,
1042                             ACPI_UINT32_MAX,
1043                             processor_walk_namespace_cb, &action, NULL);
1044 #endif
1045         register_hotcpu_notifier(&acpi_cpu_notifier);
1046 }
1047
1048 static
1049 void acpi_processor_uninstall_hotplug_notify(void)
1050 {
1051 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1052         int action = UNINSTALL_NOTIFY_HANDLER;
1053         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1054                             ACPI_ROOT_OBJECT,
1055                             ACPI_UINT32_MAX,
1056                             processor_walk_namespace_cb, &action, NULL);
1057 #endif
1058         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1059 }
1060
1061 /*
1062  * We keep the driver loaded even when ACPI is not running.
1063  * This is needed for the powernow-k8 driver, that works even without
1064  * ACPI, but needs symbols from this driver
1065  */
1066
1067 static int __init acpi_processor_init(void)
1068 {
1069         int result = 0;
1070
1071
1072         memset(&processors, 0, sizeof(processors));
1073         memset(&errata, 0, sizeof(errata));
1074
1075 #ifdef CONFIG_SMP
1076         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1077                                 (struct acpi_table_header **)&madt)))
1078                 madt = NULL;
1079 #endif
1080
1081         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1082         if (!acpi_processor_dir)
1083                 return -ENOMEM;
1084         acpi_processor_dir->owner = THIS_MODULE;
1085
1086         result = cpuidle_register_driver(&acpi_idle_driver);
1087         if (result < 0)
1088                 goto out_proc;
1089
1090         result = acpi_bus_register_driver(&acpi_processor_driver);
1091         if (result < 0)
1092                 goto out_cpuidle;
1093
1094         acpi_processor_install_hotplug_notify();
1095
1096         acpi_thermal_cpufreq_init();
1097
1098         acpi_processor_ppc_init();
1099
1100         acpi_processor_throttling_init();
1101
1102         return 0;
1103
1104 out_cpuidle:
1105         cpuidle_unregister_driver(&acpi_idle_driver);
1106
1107 out_proc:
1108         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1109
1110         return result;
1111 }
1112
1113 static void __exit acpi_processor_exit(void)
1114 {
1115         acpi_processor_ppc_exit();
1116
1117         acpi_thermal_cpufreq_exit();
1118
1119         acpi_processor_uninstall_hotplug_notify();
1120
1121         acpi_bus_unregister_driver(&acpi_processor_driver);
1122
1123         cpuidle_unregister_driver(&acpi_idle_driver);
1124
1125         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1126
1127         return;
1128 }
1129
1130 module_init(acpi_processor_init);
1131 module_exit(acpi_processor_exit);
1132
1133 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1134
1135 MODULE_ALIAS("processor");