24a362f8034c49a722005efec417714560b5b9cf
[linux-3.10.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 DEFINE_PER_CPU(struct acpi_processor *, processors);
122 struct acpi_processor_errata errata __read_mostly;
123 static int set_no_mwait(const struct dmi_system_id *id)
124 {
125         printk(KERN_NOTICE PREFIX "%s detected - "
126                 "disabling mwait for CPU C-states\n", id->ident);
127         idle_nomwait = 1;
128         return 0;
129 }
130
131 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
132         {
133         set_no_mwait, "IFL91 board", {
134         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
135         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
136         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
137         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
138         {
139         set_no_mwait, "Extensa 5220", {
140         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
141         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
142         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
143         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
144         {},
145 };
146
147 /* --------------------------------------------------------------------------
148                                 Errata Handling
149    -------------------------------------------------------------------------- */
150
151 static int acpi_processor_errata_piix4(struct pci_dev *dev)
152 {
153         u8 value1 = 0;
154         u8 value2 = 0;
155
156
157         if (!dev)
158                 return -EINVAL;
159
160         /*
161          * Note that 'dev' references the PIIX4 ACPI Controller.
162          */
163
164         switch (dev->revision) {
165         case 0:
166                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
167                 break;
168         case 1:
169                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
170                 break;
171         case 2:
172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
173                 break;
174         case 3:
175                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
176                 break;
177         default:
178                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
179                 break;
180         }
181
182         switch (dev->revision) {
183
184         case 0:         /* PIIX4 A-step */
185         case 1:         /* PIIX4 B-step */
186                 /*
187                  * See specification changes #13 ("Manual Throttle Duty Cycle")
188                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
189                  * erratum #5 ("STPCLK# Deassertion Time") from the January
190                  * 2002 PIIX4 specification update.  Applies to only older
191                  * PIIX4 models.
192                  */
193                 errata.piix4.throttle = 1;
194
195         case 2:         /* PIIX4E */
196         case 3:         /* PIIX4M */
197                 /*
198                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
199                  * Livelock") from the January 2002 PIIX4 specification update.
200                  * Applies to all PIIX4 models.
201                  */
202
203                 /*
204                  * BM-IDE
205                  * ------
206                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
207                  * Status register address.  We'll use this later to read
208                  * each IDE controller's DMA status to make sure we catch all
209                  * DMA activity.
210                  */
211                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
212                                      PCI_DEVICE_ID_INTEL_82371AB,
213                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
214                 if (dev) {
215                         errata.piix4.bmisx = pci_resource_start(dev, 4);
216                         pci_dev_put(dev);
217                 }
218
219                 /*
220                  * Type-F DMA
221                  * ----------
222                  * Find the PIIX4 ISA Controller and read the Motherboard
223                  * DMA controller's status to see if Type-F (Fast) DMA mode
224                  * is enabled (bit 7) on either channel.  Note that we'll
225                  * disable C3 support if this is enabled, as some legacy
226                  * devices won't operate well if fast DMA is disabled.
227                  */
228                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
229                                      PCI_DEVICE_ID_INTEL_82371AB_0,
230                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
231                 if (dev) {
232                         pci_read_config_byte(dev, 0x76, &value1);
233                         pci_read_config_byte(dev, 0x77, &value2);
234                         if ((value1 & 0x80) || (value2 & 0x80))
235                                 errata.piix4.fdma = 1;
236                         pci_dev_put(dev);
237                 }
238
239                 break;
240         }
241
242         if (errata.piix4.bmisx)
243                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
244                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
245         if (errata.piix4.fdma)
246                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
247                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
248
249         return 0;
250 }
251
252 static int acpi_processor_errata(struct acpi_processor *pr)
253 {
254         int result = 0;
255         struct pci_dev *dev = NULL;
256
257
258         if (!pr)
259                 return -EINVAL;
260
261         /*
262          * PIIX4
263          */
264         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
265                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
266                              PCI_ANY_ID, NULL);
267         if (dev) {
268                 result = acpi_processor_errata_piix4(dev);
269                 pci_dev_put(dev);
270         }
271
272         return result;
273 }
274
275 /* --------------------------------------------------------------------------
276                               Common ACPI processor functions
277    -------------------------------------------------------------------------- */
278
279 /*
280  * _PDC is required for a BIOS-OS handshake for most of the newer
281  * ACPI processor features.
282  */
283 static int acpi_processor_set_pdc(struct acpi_processor *pr)
284 {
285         struct acpi_object_list *pdc_in = pr->pdc;
286         acpi_status status = AE_OK;
287
288
289         if (!pdc_in)
290                 return status;
291         if (idle_nomwait) {
292                 /*
293                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
294                  * mode will be disabled in the parameter of _PDC object.
295                  * Of course C1_FFH access mode will also be disabled.
296                  */
297                 union acpi_object *obj;
298                 u32 *buffer = NULL;
299
300                 obj = pdc_in->pointer;
301                 buffer = (u32 *)(obj->buffer.pointer);
302                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
303
304         }
305         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
306
307         if (ACPI_FAILURE(status))
308                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
309                     "Could not evaluate _PDC, using legacy perf. control...\n"));
310
311         return status;
312 }
313
314 /* --------------------------------------------------------------------------
315                               FS Interface (/proc)
316    -------------------------------------------------------------------------- */
317
318 static struct proc_dir_entry *acpi_processor_dir = NULL;
319
320 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
321 {
322         struct acpi_processor *pr = seq->private;
323
324
325         if (!pr)
326                 goto end;
327
328         seq_printf(seq, "processor id:            %d\n"
329                    "acpi id:                 %d\n"
330                    "bus mastering control:   %s\n"
331                    "power management:        %s\n"
332                    "throttling control:      %s\n"
333                    "limit interface:         %s\n",
334                    pr->id,
335                    pr->acpi_id,
336                    pr->flags.bm_control ? "yes" : "no",
337                    pr->flags.power ? "yes" : "no",
338                    pr->flags.throttling ? "yes" : "no",
339                    pr->flags.limit ? "yes" : "no");
340
341       end:
342         return 0;
343 }
344
345 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
346 {
347         return single_open(file, acpi_processor_info_seq_show,
348                            PDE(inode)->data);
349 }
350
351 static int acpi_processor_add_fs(struct acpi_device *device)
352 {
353         struct proc_dir_entry *entry = NULL;
354
355
356         if (!acpi_device_dir(device)) {
357                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
358                                                      acpi_processor_dir);
359                 if (!acpi_device_dir(device))
360                         return -ENODEV;
361         }
362         acpi_device_dir(device)->owner = THIS_MODULE;
363
364         /* 'info' [R] */
365         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
366                                  S_IRUGO, acpi_device_dir(device),
367                                  &acpi_processor_info_fops,
368                                  acpi_driver_data(device));
369         if (!entry)
370                 return -EIO;
371
372         /* 'throttling' [R/W] */
373         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
374                                  S_IFREG | S_IRUGO | S_IWUSR,
375                                  acpi_device_dir(device),
376                                  &acpi_processor_throttling_fops,
377                                  acpi_driver_data(device));
378         if (!entry)
379                 return -EIO;
380
381         /* 'limit' [R/W] */
382         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
383                                  S_IFREG | S_IRUGO | S_IWUSR,
384                                  acpi_device_dir(device),
385                                  &acpi_processor_limit_fops,
386                                  acpi_driver_data(device));
387         if (!entry)
388                 return -EIO;
389         return 0;
390 }
391
392 static int acpi_processor_remove_fs(struct acpi_device *device)
393 {
394
395         if (acpi_device_dir(device)) {
396                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
397                                   acpi_device_dir(device));
398                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
399                                   acpi_device_dir(device));
400                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
401                                   acpi_device_dir(device));
402                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
403                 acpi_device_dir(device) = NULL;
404         }
405
406         return 0;
407 }
408
409 /* Use the acpiid in MADT to map cpus in case of SMP */
410
411 #ifndef CONFIG_SMP
412 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
413 #else
414
415 static struct acpi_table_madt *madt;
416
417 static int map_lapic_id(struct acpi_subtable_header *entry,
418                  u32 acpi_id, int *apic_id)
419 {
420         struct acpi_madt_local_apic *lapic =
421                 (struct acpi_madt_local_apic *)entry;
422         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
423             lapic->processor_id == acpi_id) {
424                 *apic_id = lapic->id;
425                 return 1;
426         }
427         return 0;
428 }
429
430 static int map_lsapic_id(struct acpi_subtable_header *entry,
431                   u32 acpi_id, int *apic_id)
432 {
433         struct acpi_madt_local_sapic *lsapic =
434                 (struct acpi_madt_local_sapic *)entry;
435         /* Only check enabled APICs*/
436         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
437                 /* First check against id */
438                 if (lsapic->processor_id == acpi_id) {
439                         *apic_id = (lsapic->id << 8) | lsapic->eid;
440                         return 1;
441                 /* Check against optional uid */
442                 } else if (entry->length >= 16 &&
443                         lsapic->uid == acpi_id) {
444                         *apic_id = lsapic->uid;
445                         return 1;
446                 }
447         }
448         return 0;
449 }
450
451 static int map_madt_entry(u32 acpi_id)
452 {
453         unsigned long madt_end, entry;
454         int apic_id = -1;
455
456         if (!madt)
457                 return apic_id;
458
459         entry = (unsigned long)madt;
460         madt_end = entry + madt->header.length;
461
462         /* Parse all entries looking for a match. */
463
464         entry += sizeof(struct acpi_table_madt);
465         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
466                 struct acpi_subtable_header *header =
467                         (struct acpi_subtable_header *)entry;
468                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
469                         if (map_lapic_id(header, acpi_id, &apic_id))
470                                 break;
471                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
472                         if (map_lsapic_id(header, acpi_id, &apic_id))
473                                 break;
474                 }
475                 entry += header->length;
476         }
477         return apic_id;
478 }
479
480 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
481 {
482         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
483         union acpi_object *obj;
484         struct acpi_subtable_header *header;
485         int apic_id = -1;
486
487         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
488                 goto exit;
489
490         if (!buffer.length || !buffer.pointer)
491                 goto exit;
492
493         obj = buffer.pointer;
494         if (obj->type != ACPI_TYPE_BUFFER ||
495             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
496                 goto exit;
497         }
498
499         header = (struct acpi_subtable_header *)obj->buffer.pointer;
500         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
501                 map_lapic_id(header, acpi_id, &apic_id);
502         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
503                 map_lsapic_id(header, acpi_id, &apic_id);
504         }
505
506 exit:
507         if (buffer.pointer)
508                 kfree(buffer.pointer);
509         return apic_id;
510 }
511
512 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
513 {
514         int i;
515         int apic_id = -1;
516
517         apic_id = map_mat_entry(handle, acpi_id);
518         if (apic_id == -1)
519                 apic_id = map_madt_entry(acpi_id);
520         if (apic_id == -1)
521                 return apic_id;
522
523         for_each_possible_cpu(i) {
524                 if (cpu_physical_id(i) == apic_id)
525                         return i;
526         }
527         return -1;
528 }
529 #endif
530
531 /* --------------------------------------------------------------------------
532                                  Driver Interface
533    -------------------------------------------------------------------------- */
534
535 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
536 {
537         acpi_status status = 0;
538         union acpi_object object = { 0 };
539         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
540         int cpu_index;
541         static int cpu0_initialized;
542
543
544         if (!pr)
545                 return -EINVAL;
546
547         if (num_online_cpus() > 1)
548                 errata.smp = TRUE;
549
550         acpi_processor_errata(pr);
551
552         /*
553          * Check to see if we have bus mastering arbitration control.  This
554          * is required for proper C3 usage (to maintain cache coherency).
555          */
556         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
557                 pr->flags.bm_control = 1;
558                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
559                                   "Bus mastering arbitration control present\n"));
560         } else
561                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
562                                   "No bus mastering arbitration control\n"));
563
564         /* Check if it is a Device with HID and UID */
565         if (has_uid) {
566                 unsigned long long value;
567                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
568                                                 NULL, &value);
569                 if (ACPI_FAILURE(status)) {
570                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
571                         return -ENODEV;
572                 }
573                 pr->acpi_id = value;
574         } else {
575                 /*
576                 * Evalute the processor object.  Note that it is common on SMP to
577                 * have the first (boot) processor with a valid PBLK address while
578                 * all others have a NULL address.
579                 */
580                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
581                 if (ACPI_FAILURE(status)) {
582                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
583                         return -ENODEV;
584                 }
585
586                 /*
587                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
588                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
589                 */
590                 pr->acpi_id = object.processor.proc_id;
591         }
592         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
593
594         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
595         if (!cpu0_initialized && (cpu_index == -1) &&
596             (num_online_cpus() == 1)) {
597                 cpu_index = 0;
598         }
599
600         cpu0_initialized = 1;
601
602         pr->id = cpu_index;
603
604         /*
605          *  Extra Processor objects may be enumerated on MP systems with
606          *  less than the max # of CPUs. They should be ignored _iff
607          *  they are physically not present.
608          */
609         if (pr->id == -1) {
610                 if (ACPI_FAILURE
611                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
612                         return -ENODEV;
613                 }
614         }
615
616         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
617                           pr->acpi_id));
618
619         if (!object.processor.pblk_address)
620                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
621         else if (object.processor.pblk_length != 6)
622                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
623                             object.processor.pblk_length);
624         else {
625                 pr->throttling.address = object.processor.pblk_address;
626                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
627                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
628
629                 pr->pblk = object.processor.pblk_address;
630
631                 /*
632                  * We don't care about error returns - we just try to mark
633                  * these reserved so that nobody else is confused into thinking
634                  * that this region might be unused..
635                  *
636                  * (In particular, allocating the IO range for Cardbus)
637                  */
638                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
639         }
640
641         /*
642          * If ACPI describes a slot number for this CPU, we can use it
643          * ensure we get the right value in the "physical id" field
644          * of /proc/cpuinfo
645          */
646         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
647         if (ACPI_SUCCESS(status))
648                 arch_fix_phys_package_id(pr->id, object.integer.value);
649
650         return 0;
651 }
652
653 static DEFINE_PER_CPU(void *, processor_device_array);
654
655 static int __cpuinit acpi_processor_start(struct acpi_device *device)
656 {
657         int result = 0;
658         acpi_status status = AE_OK;
659         struct acpi_processor *pr;
660         struct sys_device *sysdev;
661
662         pr = acpi_driver_data(device);
663
664         result = acpi_processor_get_info(pr, device->flags.unique_id);
665         if (result) {
666                 /* Processor is physically not present */
667                 return 0;
668         }
669
670         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
671
672         /*
673          * Buggy BIOS check
674          * ACPI id of processors can be reported wrongly by the BIOS.
675          * Don't trust it blindly
676          */
677         if (per_cpu(processor_device_array, pr->id) != NULL &&
678             per_cpu(processor_device_array, pr->id) != device) {
679                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
680                         "for the processor\n");
681                 return -ENODEV;
682         }
683         per_cpu(processor_device_array, pr->id) = device;
684
685         per_cpu(processors, pr->id) = pr;
686
687         result = acpi_processor_add_fs(device);
688         if (result)
689                 goto end;
690
691         sysdev = get_cpu_sysdev(pr->id);
692         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
693                 return -EFAULT;
694
695         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
696                                              acpi_processor_notify, pr);
697
698         /* _PDC call should be done before doing anything else (if reqd.). */
699         arch_acpi_processor_init_pdc(pr);
700         acpi_processor_set_pdc(pr);
701 #ifdef CONFIG_CPU_FREQ
702         acpi_processor_ppc_has_changed(pr);
703 #endif
704         acpi_processor_get_throttling_info(pr);
705         acpi_processor_get_limit_info(pr);
706
707
708         acpi_processor_power_init(pr, device);
709
710         pr->cdev = thermal_cooling_device_register("Processor", device,
711                                                 &processor_cooling_ops);
712         if (IS_ERR(pr->cdev)) {
713                 result = PTR_ERR(pr->cdev);
714                 goto end;
715         }
716
717         dev_info(&device->dev, "registered as cooling_device%d\n",
718                  pr->cdev->id);
719
720         result = sysfs_create_link(&device->dev.kobj,
721                                    &pr->cdev->device.kobj,
722                                    "thermal_cooling");
723         if (result)
724                 printk(KERN_ERR PREFIX "Create sysfs link\n");
725         result = sysfs_create_link(&pr->cdev->device.kobj,
726                                    &device->dev.kobj,
727                                    "device");
728         if (result)
729                 printk(KERN_ERR PREFIX "Create sysfs link\n");
730
731         if (pr->flags.throttling) {
732                 printk(KERN_INFO PREFIX "%s [%s] (supports",
733                        acpi_device_name(device), acpi_device_bid(device));
734                 printk(" %d throttling states", pr->throttling.state_count);
735                 printk(")\n");
736         }
737
738       end:
739
740         return result;
741 }
742
743 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
744 {
745         struct acpi_processor *pr = data;
746         struct acpi_device *device = NULL;
747         int saved;
748
749         if (!pr)
750                 return;
751
752         if (acpi_bus_get_device(pr->handle, &device))
753                 return;
754
755         switch (event) {
756         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
757                 saved = pr->performance_platform_limit;
758                 acpi_processor_ppc_has_changed(pr);
759                 if (saved == pr->performance_platform_limit)
760                         break;
761                 acpi_bus_generate_proc_event(device, event,
762                                         pr->performance_platform_limit);
763                 acpi_bus_generate_netlink_event(device->pnp.device_class,
764                                                   device->dev.bus_id, event,
765                                                   pr->performance_platform_limit);
766                 break;
767         case ACPI_PROCESSOR_NOTIFY_POWER:
768                 acpi_processor_cst_has_changed(pr);
769                 acpi_bus_generate_proc_event(device, event, 0);
770                 acpi_bus_generate_netlink_event(device->pnp.device_class,
771                                                   device->dev.bus_id, event, 0);
772                 break;
773         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
774                 acpi_processor_tstate_has_changed(pr);
775                 acpi_bus_generate_proc_event(device, event, 0);
776                 acpi_bus_generate_netlink_event(device->pnp.device_class,
777                                                   device->dev.bus_id, event, 0);
778         default:
779                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
780                                   "Unsupported event [0x%x]\n", event));
781                 break;
782         }
783
784         return;
785 }
786
787 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
788                 unsigned long action, void *hcpu)
789 {
790         unsigned int cpu = (unsigned long)hcpu;
791         struct acpi_processor *pr = per_cpu(processors, cpu);
792
793         if (action == CPU_ONLINE && pr) {
794                 acpi_processor_ppc_has_changed(pr);
795                 acpi_processor_cst_has_changed(pr);
796                 acpi_processor_tstate_has_changed(pr);
797         }
798         return NOTIFY_OK;
799 }
800
801 static struct notifier_block acpi_cpu_notifier =
802 {
803             .notifier_call = acpi_cpu_soft_notify,
804 };
805
806 static int acpi_processor_add(struct acpi_device *device)
807 {
808         struct acpi_processor *pr = NULL;
809
810
811         if (!device)
812                 return -EINVAL;
813
814         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
815         if (!pr)
816                 return -ENOMEM;
817
818         pr->handle = device->handle;
819         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
820         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
821         device->driver_data = pr;
822
823         return 0;
824 }
825
826 static int acpi_processor_remove(struct acpi_device *device, int type)
827 {
828         acpi_status status = AE_OK;
829         struct acpi_processor *pr = NULL;
830
831
832         if (!device || !acpi_driver_data(device))
833                 return -EINVAL;
834
835         pr = acpi_driver_data(device);
836
837         if (pr->id >= nr_cpu_ids) {
838                 kfree(pr);
839                 return 0;
840         }
841
842         if (type == ACPI_BUS_REMOVAL_EJECT) {
843                 if (acpi_processor_handle_eject(pr))
844                         return -EINVAL;
845         }
846
847         acpi_processor_power_exit(pr, device);
848
849         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
850                                             acpi_processor_notify);
851
852         sysfs_remove_link(&device->dev.kobj, "sysdev");
853
854         acpi_processor_remove_fs(device);
855
856         if (pr->cdev) {
857                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
858                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
859                 thermal_cooling_device_unregister(pr->cdev);
860                 pr->cdev = NULL;
861         }
862
863         per_cpu(processors, pr->id) = NULL;
864         per_cpu(processor_device_array, pr->id) = NULL;
865         kfree(pr);
866
867         return 0;
868 }
869
870 #ifdef CONFIG_ACPI_HOTPLUG_CPU
871 /****************************************************************************
872  *      Acpi processor hotplug support                                      *
873  ****************************************************************************/
874
875 static int is_processor_present(acpi_handle handle)
876 {
877         acpi_status status;
878         unsigned long long sta = 0;
879
880
881         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
882
883         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
884                 return 1;
885
886         /*
887          * _STA is mandatory for a processor that supports hot plug
888          */
889         if (status == AE_NOT_FOUND)
890                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
891                                 "Processor does not support hot plug\n"));
892         else
893                 ACPI_EXCEPTION((AE_INFO, status,
894                                 "Processor Device is not present"));
895         return 0;
896 }
897
898 static
899 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
900 {
901         acpi_handle phandle;
902         struct acpi_device *pdev;
903         struct acpi_processor *pr;
904
905
906         if (acpi_get_parent(handle, &phandle)) {
907                 return -ENODEV;
908         }
909
910         if (acpi_bus_get_device(phandle, &pdev)) {
911                 return -ENODEV;
912         }
913
914         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
915                 return -ENODEV;
916         }
917
918         acpi_bus_start(*device);
919
920         pr = acpi_driver_data(*device);
921         if (!pr)
922                 return -ENODEV;
923
924         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
925                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
926         }
927         return 0;
928 }
929
930 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
931                                                 u32 event, void *data)
932 {
933         struct acpi_processor *pr;
934         struct acpi_device *device = NULL;
935         int result;
936
937
938         switch (event) {
939         case ACPI_NOTIFY_BUS_CHECK:
940         case ACPI_NOTIFY_DEVICE_CHECK:
941                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
942                 "Processor driver received %s event\n",
943                        (event == ACPI_NOTIFY_BUS_CHECK) ?
944                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
945
946                 if (!is_processor_present(handle))
947                         break;
948
949                 if (acpi_bus_get_device(handle, &device)) {
950                         result = acpi_processor_device_add(handle, &device);
951                         if (result)
952                                 printk(KERN_ERR PREFIX
953                                             "Unable to add the device\n");
954                         break;
955                 }
956
957                 pr = acpi_driver_data(device);
958                 if (!pr) {
959                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
960                         break;
961                 }
962
963                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
964                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
965                         break;
966                 }
967
968                 result = acpi_processor_start(device);
969                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
970                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
971                 } else {
972                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
973                                     acpi_device_bid(device));
974                 }
975                 break;
976         case ACPI_NOTIFY_EJECT_REQUEST:
977                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
978                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
979
980                 if (acpi_bus_get_device(handle, &device)) {
981                         printk(KERN_ERR PREFIX
982                                     "Device don't exist, dropping EJECT\n");
983                         break;
984                 }
985                 pr = acpi_driver_data(device);
986                 if (!pr) {
987                         printk(KERN_ERR PREFIX
988                                     "Driver data is NULL, dropping EJECT\n");
989                         return;
990                 }
991
992                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
993                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
994                 break;
995         default:
996                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
997                                   "Unsupported event [0x%x]\n", event));
998                 break;
999         }
1000
1001         return;
1002 }
1003
1004 static acpi_status
1005 processor_walk_namespace_cb(acpi_handle handle,
1006                             u32 lvl, void *context, void **rv)
1007 {
1008         acpi_status status;
1009         int *action = context;
1010         acpi_object_type type = 0;
1011
1012         status = acpi_get_type(handle, &type);
1013         if (ACPI_FAILURE(status))
1014                 return (AE_OK);
1015
1016         if (type != ACPI_TYPE_PROCESSOR)
1017                 return (AE_OK);
1018
1019         switch (*action) {
1020         case INSTALL_NOTIFY_HANDLER:
1021                 acpi_install_notify_handler(handle,
1022                                             ACPI_SYSTEM_NOTIFY,
1023                                             acpi_processor_hotplug_notify,
1024                                             NULL);
1025                 break;
1026         case UNINSTALL_NOTIFY_HANDLER:
1027                 acpi_remove_notify_handler(handle,
1028                                            ACPI_SYSTEM_NOTIFY,
1029                                            acpi_processor_hotplug_notify);
1030                 break;
1031         default:
1032                 break;
1033         }
1034
1035         return (AE_OK);
1036 }
1037
1038 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1039 {
1040
1041         if (!is_processor_present(handle)) {
1042                 return AE_ERROR;
1043         }
1044
1045         if (acpi_map_lsapic(handle, p_cpu))
1046                 return AE_ERROR;
1047
1048         if (arch_register_cpu(*p_cpu)) {
1049                 acpi_unmap_lsapic(*p_cpu);
1050                 return AE_ERROR;
1051         }
1052
1053         return AE_OK;
1054 }
1055
1056 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1057 {
1058         if (cpu_online(pr->id))
1059                 cpu_down(pr->id);
1060
1061         arch_unregister_cpu(pr->id);
1062         acpi_unmap_lsapic(pr->id);
1063         return (0);
1064 }
1065 #else
1066 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1067 {
1068         return AE_ERROR;
1069 }
1070 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1071 {
1072         return (-EINVAL);
1073 }
1074 #endif
1075
1076 static
1077 void acpi_processor_install_hotplug_notify(void)
1078 {
1079 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1080         int action = INSTALL_NOTIFY_HANDLER;
1081         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1082                             ACPI_ROOT_OBJECT,
1083                             ACPI_UINT32_MAX,
1084                             processor_walk_namespace_cb, &action, NULL);
1085 #endif
1086         register_hotcpu_notifier(&acpi_cpu_notifier);
1087 }
1088
1089 static
1090 void acpi_processor_uninstall_hotplug_notify(void)
1091 {
1092 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1093         int action = UNINSTALL_NOTIFY_HANDLER;
1094         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1095                             ACPI_ROOT_OBJECT,
1096                             ACPI_UINT32_MAX,
1097                             processor_walk_namespace_cb, &action, NULL);
1098 #endif
1099         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1100 }
1101
1102 /*
1103  * We keep the driver loaded even when ACPI is not running.
1104  * This is needed for the powernow-k8 driver, that works even without
1105  * ACPI, but needs symbols from this driver
1106  */
1107
1108 static int __init acpi_processor_init(void)
1109 {
1110         int result = 0;
1111
1112         memset(&errata, 0, sizeof(errata));
1113
1114 #ifdef CONFIG_SMP
1115         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1116                                 (struct acpi_table_header **)&madt)))
1117                 madt = NULL;
1118 #endif
1119
1120         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1121         if (!acpi_processor_dir)
1122                 return -ENOMEM;
1123         acpi_processor_dir->owner = THIS_MODULE;
1124
1125         /*
1126          * Check whether the system is DMI table. If yes, OSPM
1127          * should not use mwait for CPU-states.
1128          */
1129         dmi_check_system(processor_idle_dmi_table);
1130         result = cpuidle_register_driver(&acpi_idle_driver);
1131         if (result < 0)
1132                 goto out_proc;
1133
1134         result = acpi_bus_register_driver(&acpi_processor_driver);
1135         if (result < 0)
1136                 goto out_cpuidle;
1137
1138         acpi_processor_install_hotplug_notify();
1139
1140         acpi_thermal_cpufreq_init();
1141
1142         acpi_processor_ppc_init();
1143
1144         acpi_processor_throttling_init();
1145
1146         return 0;
1147
1148 out_cpuidle:
1149         cpuidle_unregister_driver(&acpi_idle_driver);
1150
1151 out_proc:
1152         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1153
1154         return result;
1155 }
1156
1157 static void __exit acpi_processor_exit(void)
1158 {
1159         acpi_processor_ppc_exit();
1160
1161         acpi_thermal_cpufreq_exit();
1162
1163         acpi_processor_uninstall_hotplug_notify();
1164
1165         acpi_bus_unregister_driver(&acpi_processor_driver);
1166
1167         cpuidle_unregister_driver(&acpi_idle_driver);
1168
1169         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1170
1171         return;
1172 }
1173
1174 module_init(acpi_processor_init);
1175 module_exit(acpi_processor_exit);
1176
1177 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1178
1179 MODULE_ALIAS("processor");