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Input: ads7846 - fix uninitialized var warning
[pv_ops_mirror.git] / drivers / acpi / processor_core.c
bloba3cc8a98255cf724248c7efbf749a912bc9ef4f1
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 .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 = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
330 S_IRUGO, acpi_device_dir(device));
331 if (!entry)
332 return -EIO;
333 else {
334 entry->proc_fops = &acpi_processor_info_fops;
335 entry->data = acpi_driver_data(device);
336 entry->owner = THIS_MODULE;
337 }
338
339 /* 'throttling' [R/W] */
340 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
341 S_IFREG | S_IRUGO | S_IWUSR,
342 acpi_device_dir(device));
343 if (!entry)
344 return -EIO;
345 else {
346 entry->proc_fops = &acpi_processor_throttling_fops;
347 entry->data = acpi_driver_data(device);
348 entry->owner = THIS_MODULE;
349 }
350
351 /* 'limit' [R/W] */
352 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
353 S_IFREG | S_IRUGO | S_IWUSR,
354 acpi_device_dir(device));
355 if (!entry)
356 return -EIO;
357 else {
358 entry->proc_fops = &acpi_processor_limit_fops;
359 entry->data = acpi_driver_data(device);
360 entry->owner = THIS_MODULE;
361 }
362
363 return 0;
364 }
365
366 static int acpi_processor_remove_fs(struct acpi_device *device)
367 {
368
369 if (acpi_device_dir(device)) {
370 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
371 acpi_device_dir(device));
372 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
373 acpi_device_dir(device));
374 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
375 acpi_device_dir(device));
376 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
377 acpi_device_dir(device) = NULL;
378 }
379
380 return 0;
381 }
382
383 /* Use the acpiid in MADT to map cpus in case of SMP */
384
385 #ifndef CONFIG_SMP
386 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
387 #else
388
389 static struct acpi_table_madt *madt;
390
391 static int map_lapic_id(struct acpi_subtable_header *entry,
392 u32 acpi_id, int *apic_id)
393 {
394 struct acpi_madt_local_apic *lapic =
395 (struct acpi_madt_local_apic *)entry;
396 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
397 lapic->processor_id == acpi_id) {
398 *apic_id = lapic->id;
399 return 1;
400 }
401 return 0;
402 }
403
404 static int map_lsapic_id(struct acpi_subtable_header *entry,
405 u32 acpi_id, int *apic_id)
406 {
407 struct acpi_madt_local_sapic *lsapic =
408 (struct acpi_madt_local_sapic *)entry;
409 /* Only check enabled APICs*/
410 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
411 /* First check against id */
412 if (lsapic->processor_id == acpi_id) {
413 *apic_id = (lsapic->id << 8) | lsapic->eid;
414 return 1;
415 /* Check against optional uid */
416 } else if (entry->length >= 16 &&
417 lsapic->uid == acpi_id) {
418 *apic_id = lsapic->uid;
419 return 1;
420 }
421 }
422 return 0;
423 }
424
425 static int map_madt_entry(u32 acpi_id)
426 {
427 unsigned long madt_end, entry;
428 int apic_id = -1;
429
430 if (!madt)
431 return apic_id;
432
433 entry = (unsigned long)madt;
434 madt_end = entry + madt->header.length;
435
436 /* Parse all entries looking for a match. */
437
438 entry += sizeof(struct acpi_table_madt);
439 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
440 struct acpi_subtable_header *header =
441 (struct acpi_subtable_header *)entry;
442 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
443 if (map_lapic_id(header, acpi_id, &apic_id))
444 break;
445 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
446 if (map_lsapic_id(header, acpi_id, &apic_id))
447 break;
448 }
449 entry += header->length;
450 }
451 return apic_id;
452 }
453
454 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
455 {
456 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
457 union acpi_object *obj;
458 struct acpi_subtable_header *header;
459 int apic_id = -1;
460
461 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
462 goto exit;
463
464 if (!buffer.length || !buffer.pointer)
465 goto exit;
466
467 obj = buffer.pointer;
468 if (obj->type != ACPI_TYPE_BUFFER ||
469 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
470 goto exit;
471 }
472
473 header = (struct acpi_subtable_header *)obj->buffer.pointer;
474 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
475 map_lapic_id(header, acpi_id, &apic_id);
476 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
477 map_lsapic_id(header, acpi_id, &apic_id);
478 }
479
480 exit:
481 if (buffer.pointer)
482 kfree(buffer.pointer);
483 return apic_id;
484 }
485
486 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
487 {
488 int i;
489 int apic_id = -1;
490
491 apic_id = map_mat_entry(handle, acpi_id);
492 if (apic_id == -1)
493 apic_id = map_madt_entry(acpi_id);
494 if (apic_id == -1)
495 return apic_id;
496
497 for_each_possible_cpu(i) {
498 if (cpu_physical_id(i) == apic_id)
499 return i;
500 }
501 return -1;
502 }
503 #endif
504
505 /* --------------------------------------------------------------------------
506 Driver Interface
507 -------------------------------------------------------------------------- */
508
509 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
510 {
511 acpi_status status = 0;
512 union acpi_object object = { 0 };
513 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
514 int cpu_index;
515 static int cpu0_initialized;
516
517
518 if (!pr)
519 return -EINVAL;
520
521 if (num_online_cpus() > 1)
522 errata.smp = TRUE;
523
524 acpi_processor_errata(pr);
525
526 /*
527 * Check to see if we have bus mastering arbitration control. This
528 * is required for proper C3 usage (to maintain cache coherency).
529 */
530 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
531 pr->flags.bm_control = 1;
532 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
533 "Bus mastering arbitration control present\n"));
534 } else
535 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
536 "No bus mastering arbitration control\n"));
537
538 /* Check if it is a Device with HID and UID */
539 if (has_uid) {
540 unsigned long value;
541 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
542 NULL, &value);
543 if (ACPI_FAILURE(status)) {
544 printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
545 return -ENODEV;
546 }
547 pr->acpi_id = value;
548 } else {
549 /*
550 * Evalute the processor object. Note that it is common on SMP to
551 * have the first (boot) processor with a valid PBLK address while
552 * all others have a NULL address.
553 */
554 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
555 if (ACPI_FAILURE(status)) {
556 printk(KERN_ERR PREFIX "Evaluating processor object\n");
557 return -ENODEV;
558 }
559
560 /*
561 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
562 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
563 */
564 pr->acpi_id = object.processor.proc_id;
565 }
566 cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
567
568 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
569 if (!cpu0_initialized && (cpu_index == -1) &&
570 (num_online_cpus() == 1)) {
571 cpu_index = 0;
572 }
573
574 cpu0_initialized = 1;
575
576 pr->id = cpu_index;
577
578 /*
579 * Extra Processor objects may be enumerated on MP systems with
580 * less than the max # of CPUs. They should be ignored _iff
581 * they are physically not present.
582 */
583 if (pr->id == -1) {
584 if (ACPI_FAILURE
585 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
586 return -ENODEV;
587 }
588 }
589
590 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
591 pr->acpi_id));
592
593 if (!object.processor.pblk_address)
594 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
595 else if (object.processor.pblk_length != 6)
596 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
597 object.processor.pblk_length);
598 else {
599 pr->throttling.address = object.processor.pblk_address;
600 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
601 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
602
603 pr->pblk = object.processor.pblk_address;
604
605 /*
606 * We don't care about error returns - we just try to mark
607 * these reserved so that nobody else is confused into thinking
608 * that this region might be unused..
609 *
610 * (In particular, allocating the IO range for Cardbus)
611 */
612 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
613 }
614
615 return 0;
616 }
617
618 static void *processor_device_array[NR_CPUS];
619
620 static int __cpuinit acpi_processor_start(struct acpi_device *device)
621 {
622 int result = 0;
623 acpi_status status = AE_OK;
624 struct acpi_processor *pr;
625
626
627 pr = acpi_driver_data(device);
628
629 result = acpi_processor_get_info(pr, device->flags.unique_id);
630 if (result) {
631 /* Processor is physically not present */
632 return 0;
633 }
634
635 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
636
637 /*
638 * Buggy BIOS check
639 * ACPI id of processors can be reported wrongly by the BIOS.
640 * Don't trust it blindly
641 */
642 if (processor_device_array[pr->id] != NULL &&
643 processor_device_array[pr->id] != device) {
644 printk(KERN_WARNING "BIOS reported wrong ACPI id "
645 "for the processor\n");
646 return -ENODEV;
647 }
648 processor_device_array[pr->id] = device;
649
650 processors[pr->id] = pr;
651
652 result = acpi_processor_add_fs(device);
653 if (result)
654 goto end;
655
656 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
657 acpi_processor_notify, pr);
658
659 /* _PDC call should be done before doing anything else (if reqd.). */
660 arch_acpi_processor_init_pdc(pr);
661 acpi_processor_set_pdc(pr);
662 #ifdef CONFIG_CPU_FREQ
663 acpi_processor_ppc_has_changed(pr);
664 #endif
665 acpi_processor_get_throttling_info(pr);
666 acpi_processor_get_limit_info(pr);
667
668
669 acpi_processor_power_init(pr, device);
670
671 pr->cdev = thermal_cooling_device_register("Processor", device,
672 &processor_cooling_ops);
673 if (IS_ERR(pr->cdev)) {
674 result = PTR_ERR(pr->cdev);
675 goto end;
676 }
677 if (pr->cdev) {
678 printk(KERN_INFO PREFIX
679 "%s is registered as cooling_device%d\n",
680 device->dev.bus_id, pr->cdev->id);
681
682 result = sysfs_create_link(&device->dev.kobj,
683 &pr->cdev->device.kobj,
684 "thermal_cooling");
685 if (result)
686 return result;
687 result = sysfs_create_link(&pr->cdev->device.kobj,
688 &device->dev.kobj,
689 "device");
690 if (result)
691 return result;
692 }
693
694 if (pr->flags.throttling) {
695 printk(KERN_INFO PREFIX "%s [%s] (supports",
696 acpi_device_name(device), acpi_device_bid(device));
697 printk(" %d throttling states", pr->throttling.state_count);
698 printk(")\n");
699 }
700
701 end:
702
703 return result;
704 }
705
706 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
707 {
708 struct acpi_processor *pr = data;
709 struct acpi_device *device = NULL;
710 int saved;
711
712 if (!pr)
713 return;
714
715 if (acpi_bus_get_device(pr->handle, &device))
716 return;
717
718 switch (event) {
719 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
720 saved = pr->performance_platform_limit;
721 acpi_processor_ppc_has_changed(pr);
722 if (saved == pr->performance_platform_limit)
723 break;
724 acpi_bus_generate_proc_event(device, event,
725 pr->performance_platform_limit);
726 acpi_bus_generate_netlink_event(device->pnp.device_class,
727 device->dev.bus_id, event,
728 pr->performance_platform_limit);
729 break;
730 case ACPI_PROCESSOR_NOTIFY_POWER:
731 acpi_processor_cst_has_changed(pr);
732 acpi_bus_generate_proc_event(device, event, 0);
733 acpi_bus_generate_netlink_event(device->pnp.device_class,
734 device->dev.bus_id, event, 0);
735 break;
736 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
737 acpi_processor_tstate_has_changed(pr);
738 acpi_bus_generate_proc_event(device, event, 0);
739 acpi_bus_generate_netlink_event(device->pnp.device_class,
740 device->dev.bus_id, event, 0);
741 default:
742 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
743 "Unsupported event [0x%x]\n", event));
744 break;
745 }
746
747 return;
748 }
749
750 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
751 unsigned long action, void *hcpu)
752 {
753 unsigned int cpu = (unsigned long)hcpu;
754 struct acpi_processor *pr = processors[cpu];
755
756 if (action == CPU_ONLINE && pr) {
757 acpi_processor_ppc_has_changed(pr);
758 acpi_processor_cst_has_changed(pr);
759 acpi_processor_tstate_has_changed(pr);
760 }
761 return NOTIFY_OK;
762 }
763
764 static struct notifier_block acpi_cpu_notifier =
765 {
766 .notifier_call = acpi_cpu_soft_notify,
767 };
768
769 static int acpi_processor_add(struct acpi_device *device)
770 {
771 struct acpi_processor *pr = NULL;
772
773
774 if (!device)
775 return -EINVAL;
776
777 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
778 if (!pr)
779 return -ENOMEM;
780
781 pr->handle = device->handle;
782 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
783 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
784 acpi_driver_data(device) = pr;
785
786 return 0;
787 }
788
789 static int acpi_processor_remove(struct acpi_device *device, int type)
790 {
791 acpi_status status = AE_OK;
792 struct acpi_processor *pr = NULL;
793
794
795 if (!device || !acpi_driver_data(device))
796 return -EINVAL;
797
798 pr = acpi_driver_data(device);
799
800 if (pr->id >= nr_cpu_ids) {
801 kfree(pr);
802 return 0;
803 }
804
805 if (type == ACPI_BUS_REMOVAL_EJECT) {
806 if (acpi_processor_handle_eject(pr))
807 return -EINVAL;
808 }
809
810 acpi_processor_power_exit(pr, device);
811
812 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
813 acpi_processor_notify);
814
815 acpi_processor_remove_fs(device);
816
817 if (pr->cdev) {
818 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
819 sysfs_remove_link(&pr->cdev->device.kobj, "device");
820 thermal_cooling_device_unregister(pr->cdev);
821 pr->cdev = NULL;
822 }
823
824 processors[pr->id] = NULL;
825
826 kfree(pr);
827
828 return 0;
829 }
830
831 #ifdef CONFIG_ACPI_HOTPLUG_CPU
832 /****************************************************************************
833 * Acpi processor hotplug support *
834 ****************************************************************************/
835
836 static int is_processor_present(acpi_handle handle)
837 {
838 acpi_status status;
839 unsigned long sta = 0;
840
841
842 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
843 /*
844 * if a processor object does not have an _STA object,
845 * OSPM assumes that the processor is present.
846 */
847 if (status == AE_NOT_FOUND)
848 return 1;
849
850 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
851 return 1;
852
853 ACPI_EXCEPTION((AE_INFO, status, "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
890 acpi_processor_hotplug_notify(acpi_handle handle, 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 printk("Processor driver received %s event\n",
901 (event == ACPI_NOTIFY_BUS_CHECK) ?
902 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
903
904 if (!is_processor_present(handle))
905 break;
906
907 if (acpi_bus_get_device(handle, &device)) {
908 result = acpi_processor_device_add(handle, &device);
909 if (result)
910 printk(KERN_ERR PREFIX
911 "Unable to add the device\n");
912 break;
913 }
914
915 pr = acpi_driver_data(device);
916 if (!pr) {
917 printk(KERN_ERR PREFIX "Driver data is NULL\n");
918 break;
919 }
920
921 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
922 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
923 break;
924 }
925
926 result = acpi_processor_start(device);
927 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
928 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
929 } else {
930 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
931 acpi_device_bid(device));
932 }
933 break;
934 case ACPI_NOTIFY_EJECT_REQUEST:
935 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
936 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
937
938 if (acpi_bus_get_device(handle, &device)) {
939 printk(KERN_ERR PREFIX
940 "Device don't exist, dropping EJECT\n");
941 break;
942 }
943 pr = acpi_driver_data(device);
944 if (!pr) {
945 printk(KERN_ERR PREFIX
946 "Driver data is NULL, dropping EJECT\n");
947 return;
948 }
949
950 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
951 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
952 break;
953 default:
954 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
955 "Unsupported event [0x%x]\n", event));
956 break;
957 }
958
959 return;
960 }
961
962 static acpi_status
963 processor_walk_namespace_cb(acpi_handle handle,
964 u32 lvl, void *context, void **rv)
965 {
966 acpi_status status;
967 int *action = context;
968 acpi_object_type type = 0;
969
970 status = acpi_get_type(handle, &type);
971 if (ACPI_FAILURE(status))
972 return (AE_OK);
973
974 if (type != ACPI_TYPE_PROCESSOR)
975 return (AE_OK);
976
977 switch (*action) {
978 case INSTALL_NOTIFY_HANDLER:
979 acpi_install_notify_handler(handle,
980 ACPI_SYSTEM_NOTIFY,
981 acpi_processor_hotplug_notify,
982 NULL);
983 break;
984 case UNINSTALL_NOTIFY_HANDLER:
985 acpi_remove_notify_handler(handle,
986 ACPI_SYSTEM_NOTIFY,
987 acpi_processor_hotplug_notify);
988 break;
989 default:
990 break;
991 }
992
993 return (AE_OK);
994 }
995
996 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
997 {
998
999 if (!is_processor_present(handle)) {
1000 return AE_ERROR;
1001 }
1002
1003 if (acpi_map_lsapic(handle, p_cpu))
1004 return AE_ERROR;
1005
1006 if (arch_register_cpu(*p_cpu)) {
1007 acpi_unmap_lsapic(*p_cpu);
1008 return AE_ERROR;
1009 }
1010
1011 return AE_OK;
1012 }
1013
1014 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1015 {
1016 if (cpu_online(pr->id)) {
1017 return (-EINVAL);
1018 }
1019 arch_unregister_cpu(pr->id);
1020 acpi_unmap_lsapic(pr->id);
1021 return (0);
1022 }
1023 #else
1024 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1025 {
1026 return AE_ERROR;
1027 }
1028 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1029 {
1030 return (-EINVAL);
1031 }
1032 #endif
1033
1034 static
1035 void acpi_processor_install_hotplug_notify(void)
1036 {
1037 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1038 int action = INSTALL_NOTIFY_HANDLER;
1039 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1040 ACPI_ROOT_OBJECT,
1041 ACPI_UINT32_MAX,
1042 processor_walk_namespace_cb, &action, NULL);
1043 #endif
1044 register_hotcpu_notifier(&acpi_cpu_notifier);
1045 }
1046
1047 static
1048 void acpi_processor_uninstall_hotplug_notify(void)
1049 {
1050 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1051 int action = UNINSTALL_NOTIFY_HANDLER;
1052 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1053 ACPI_ROOT_OBJECT,
1054 ACPI_UINT32_MAX,
1055 processor_walk_namespace_cb, &action, NULL);
1056 #endif
1057 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1058 }
1059
1060 /*
1061 * We keep the driver loaded even when ACPI is not running.
1062 * This is needed for the powernow-k8 driver, that works even without
1063 * ACPI, but needs symbols from this driver
1064 */
1065
1066 static int __init acpi_processor_init(void)
1067 {
1068 int result = 0;
1069
1070
1071 memset(&processors, 0, sizeof(processors));
1072 memset(&errata, 0, sizeof(errata));
1073
1074 #ifdef CONFIG_SMP
1075 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1076 (struct acpi_table_header **)&madt)))
1077 madt = NULL;
1078 #endif
1079
1080 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1081 if (!acpi_processor_dir)
1082 return -ENOMEM;
1083 acpi_processor_dir->owner = THIS_MODULE;
1084
1085 result = cpuidle_register_driver(&acpi_idle_driver);
1086 if (result < 0)
1087 goto out_proc;
1088
1089 result = acpi_bus_register_driver(&acpi_processor_driver);
1090 if (result < 0)
1091 goto out_cpuidle;
1092
1093 acpi_processor_install_hotplug_notify();
1094
1095 acpi_thermal_cpufreq_init();
1096
1097 acpi_processor_ppc_init();
1098
1099 acpi_processor_throttling_init();
1100
1101 return 0;
1102
1103 out_cpuidle:
1104 cpuidle_unregister_driver(&acpi_idle_driver);
1105
1106 out_proc:
1107 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1108
1109 return result;
1110 }
1111
1112 static void __exit acpi_processor_exit(void)
1113 {
1114 acpi_processor_ppc_exit();
1115
1116 acpi_thermal_cpufreq_exit();
1117
1118 acpi_processor_uninstall_hotplug_notify();
1119
1120 acpi_bus_unregister_driver(&acpi_processor_driver);
1121
1122 cpuidle_unregister_driver(&acpi_idle_driver);
1123
1124 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1125
1126 return;
1127 }
1128
1129 module_init(acpi_processor_init);
1130 module_exit(acpi_processor_exit);
1131
1132 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1133
1134 MODULE_ALIAS("processor");
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