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