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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_CLASS "processor"
63#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
64#define ACPI_PROCESSOR_FILE_INFO "info"
65#define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
66#define ACPI_PROCESSOR_FILE_LIMIT "limit"
67#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
68#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
69#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
70
71#define ACPI_PROCESSOR_LIMIT_USER 0
72#define ACPI_PROCESSOR_LIMIT_THERMAL 1
73
74#define _COMPONENT ACPI_PROCESSOR_COMPONENT
75ACPI_MODULE_NAME("processor_core");
76
77MODULE_AUTHOR("Paul Diefenbaugh");
78MODULE_DESCRIPTION("ACPI Processor Driver");
79MODULE_LICENSE("GPL");
80
81static int acpi_processor_add(struct acpi_device *device);
82static int acpi_processor_start(struct acpi_device *device);
83static int acpi_processor_remove(struct acpi_device *device, int type);
84static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
85static void acpi_processor_notify(struct acpi_device *device, u32 event);
86static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
87static int acpi_processor_handle_eject(struct acpi_processor *pr);
88
89
90static const struct acpi_device_id processor_device_ids[] = {
91 {ACPI_PROCESSOR_OBJECT_HID, 0},
92 {"ACPI0007", 0},
93 {"", 0},
94};
95MODULE_DEVICE_TABLE(acpi, processor_device_ids);
96
97static 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 .notify = acpi_processor_notify,
108 },
109};
110
111#define INSTALL_NOTIFY_HANDLER 1
112#define UNINSTALL_NOTIFY_HANDLER 2
113
114static 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
122DEFINE_PER_CPU(struct acpi_processor *, processors);
123struct acpi_processor_errata errata __read_mostly;
124static int set_no_mwait(const struct dmi_system_id *id)
125{
126 printk(KERN_NOTICE PREFIX "%s detected - "
127 "disabling mwait for CPU C-states\n", id->ident);
128 idle_nomwait = 1;
129 return 0;
130}
131
132static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
133 {
134 set_no_mwait, "IFL91 board", {
135 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
136 DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
137 DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
138 DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
139 {
140 set_no_mwait, "Extensa 5220", {
141 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
142 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
143 DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
144 DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
145 {},
146};
147
148
149
150
151
152static int acpi_processor_errata_piix4(struct pci_dev *dev)
153{
154 u8 value1 = 0;
155 u8 value2 = 0;
156
157
158 if (!dev)
159 return -EINVAL;
160
161
162
163
164
165 switch (dev->revision) {
166 case 0:
167 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
168 break;
169 case 1:
170 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
171 break;
172 case 2:
173 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
174 break;
175 case 3:
176 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
177 break;
178 default:
179 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
180 break;
181 }
182
183 switch (dev->revision) {
184
185 case 0:
186 case 1:
187
188
189
190
191
192
193
194 errata.piix4.throttle = 1;
195
196 case 2:
197 case 3:
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
213 PCI_DEVICE_ID_INTEL_82371AB,
214 PCI_ANY_ID, PCI_ANY_ID, NULL);
215 if (dev) {
216 errata.piix4.bmisx = pci_resource_start(dev, 4);
217 pci_dev_put(dev);
218 }
219
220
221
222
223
224
225
226
227
228
229 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
230 PCI_DEVICE_ID_INTEL_82371AB_0,
231 PCI_ANY_ID, PCI_ANY_ID, NULL);
232 if (dev) {
233 pci_read_config_byte(dev, 0x76, &value1);
234 pci_read_config_byte(dev, 0x77, &value2);
235 if ((value1 & 0x80) || (value2 & 0x80))
236 errata.piix4.fdma = 1;
237 pci_dev_put(dev);
238 }
239
240 break;
241 }
242
243 if (errata.piix4.bmisx)
244 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
245 "Bus master activity detection (BM-IDE) erratum enabled\n"));
246 if (errata.piix4.fdma)
247 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
248 "Type-F DMA livelock erratum (C3 disabled)\n"));
249
250 return 0;
251}
252
253static int acpi_processor_errata(struct acpi_processor *pr)
254{
255 int result = 0;
256 struct pci_dev *dev = NULL;
257
258
259 if (!pr)
260 return -EINVAL;
261
262
263
264
265 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
266 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
267 PCI_ANY_ID, NULL);
268 if (dev) {
269 result = acpi_processor_errata_piix4(dev);
270 pci_dev_put(dev);
271 }
272
273 return result;
274}
275
276
277
278
279
280
281
282
283
284static int acpi_processor_set_pdc(struct acpi_processor *pr)
285{
286 struct acpi_object_list *pdc_in = pr->pdc;
287 acpi_status status = AE_OK;
288
289
290 if (!pdc_in)
291 return status;
292 if (idle_nomwait) {
293
294
295
296
297
298 union acpi_object *obj;
299 u32 *buffer = NULL;
300
301 obj = pdc_in->pointer;
302 buffer = (u32 *)(obj->buffer.pointer);
303 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
304
305 }
306 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
307
308 if (ACPI_FAILURE(status))
309 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
310 "Could not evaluate _PDC, using legacy perf. control...\n"));
311
312 return status;
313}
314
315
316
317
318
319static struct proc_dir_entry *acpi_processor_dir = NULL;
320
321static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
322{
323 struct acpi_processor *pr = seq->private;
324
325
326 if (!pr)
327 goto end;
328
329 seq_printf(seq, "processor id: %d\n"
330 "acpi id: %d\n"
331 "bus mastering control: %s\n"
332 "power management: %s\n"
333 "throttling control: %s\n"
334 "limit interface: %s\n",
335 pr->id,
336 pr->acpi_id,
337 pr->flags.bm_control ? "yes" : "no",
338 pr->flags.power ? "yes" : "no",
339 pr->flags.throttling ? "yes" : "no",
340 pr->flags.limit ? "yes" : "no");
341
342 end:
343 return 0;
344}
345
346static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
347{
348 return single_open(file, acpi_processor_info_seq_show,
349 PDE(inode)->data);
350}
351
352static int acpi_processor_add_fs(struct acpi_device *device)
353{
354 struct proc_dir_entry *entry = NULL;
355
356
357 if (!acpi_device_dir(device)) {
358 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
359 acpi_processor_dir);
360 if (!acpi_device_dir(device))
361 return -ENODEV;
362 }
363
364
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
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
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
392static 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
410
411#ifndef CONFIG_SMP
412static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
413#else
414
415static struct acpi_table_madt *madt;
416
417static 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
430static int map_x2apic_id(struct acpi_subtable_header *entry,
431 int device_declaration, u32 acpi_id, int *apic_id)
432{
433 struct acpi_madt_local_x2apic *apic =
434 (struct acpi_madt_local_x2apic *)entry;
435 u32 tmp = apic->local_apic_id;
436
437
438 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
439 return 0;
440
441
442 if (device_declaration) {
443 if (apic->uid == acpi_id)
444 goto found;
445 }
446
447 return 0;
448found:
449 *apic_id = tmp;
450 return 1;
451}
452
453static int map_lsapic_id(struct acpi_subtable_header *entry,
454 int device_declaration, u32 acpi_id, int *apic_id)
455{
456 struct acpi_madt_local_sapic *lsapic =
457 (struct acpi_madt_local_sapic *)entry;
458 u32 tmp = (lsapic->id << 8) | lsapic->eid;
459
460
461 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
462 return 0;
463
464
465 if (device_declaration) {
466 if (entry->length < 16)
467 printk(KERN_ERR PREFIX
468 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
469 tmp);
470 else if (lsapic->uid == acpi_id)
471 goto found;
472
473 } else if (lsapic->processor_id == acpi_id)
474 goto found;
475
476 return 0;
477found:
478 *apic_id = tmp;
479 return 1;
480}
481
482static int map_madt_entry(int type, u32 acpi_id)
483{
484 unsigned long madt_end, entry;
485 int apic_id = -1;
486
487 if (!madt)
488 return apic_id;
489
490 entry = (unsigned long)madt;
491 madt_end = entry + madt->header.length;
492
493
494
495 entry += sizeof(struct acpi_table_madt);
496 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
497 struct acpi_subtable_header *header =
498 (struct acpi_subtable_header *)entry;
499 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
500 if (map_lapic_id(header, acpi_id, &apic_id))
501 break;
502 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
503 if (map_x2apic_id(header, type, acpi_id, &apic_id))
504 break;
505 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
506 if (map_lsapic_id(header, type, acpi_id, &apic_id))
507 break;
508 }
509 entry += header->length;
510 }
511 return apic_id;
512}
513
514static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
515{
516 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
517 union acpi_object *obj;
518 struct acpi_subtable_header *header;
519 int apic_id = -1;
520
521 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
522 goto exit;
523
524 if (!buffer.length || !buffer.pointer)
525 goto exit;
526
527 obj = buffer.pointer;
528 if (obj->type != ACPI_TYPE_BUFFER ||
529 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
530 goto exit;
531 }
532
533 header = (struct acpi_subtable_header *)obj->buffer.pointer;
534 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
535 map_lapic_id(header, acpi_id, &apic_id);
536 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
537 map_lsapic_id(header, type, acpi_id, &apic_id);
538 }
539
540exit:
541 if (buffer.pointer)
542 kfree(buffer.pointer);
543 return apic_id;
544}
545
546static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
547{
548 int i;
549 int apic_id = -1;
550
551 apic_id = map_mat_entry(handle, type, acpi_id);
552 if (apic_id == -1)
553 apic_id = map_madt_entry(type, acpi_id);
554 if (apic_id == -1)
555 return apic_id;
556
557 for_each_possible_cpu(i) {
558 if (cpu_physical_id(i) == apic_id)
559 return i;
560 }
561 return -1;
562}
563#endif
564
565
566
567
568
569static int acpi_processor_get_info(struct acpi_device *device)
570{
571 acpi_status status = 0;
572 union acpi_object object = { 0 };
573 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
574 struct acpi_processor *pr;
575 int cpu_index, device_declaration = 0;
576 static int cpu0_initialized;
577
578 pr = acpi_driver_data(device);
579 if (!pr)
580 return -EINVAL;
581
582 if (num_online_cpus() > 1)
583 errata.smp = TRUE;
584
585 acpi_processor_errata(pr);
586
587
588
589
590
591 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
592 pr->flags.bm_control = 1;
593 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
594 "Bus mastering arbitration control present\n"));
595 } else
596 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
597 "No bus mastering arbitration control\n"));
598
599 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
600
601 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
602 if (ACPI_FAILURE(status)) {
603 printk(KERN_ERR PREFIX "Evaluating processor object\n");
604 return -ENODEV;
605 }
606
607
608
609
610
611
612 pr->acpi_id = object.processor.proc_id;
613 } else {
614
615
616
617
618 unsigned long long value;
619 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
620 NULL, &value);
621 if (ACPI_FAILURE(status)) {
622 printk(KERN_ERR PREFIX
623 "Evaluating processor _UID [%#x]\n", status);
624 return -ENODEV;
625 }
626 device_declaration = 1;
627 pr->acpi_id = value;
628 }
629 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
630
631
632 if (!cpu0_initialized && (cpu_index == -1) &&
633 (num_online_cpus() == 1)) {
634 cpu_index = 0;
635 }
636
637 cpu0_initialized = 1;
638
639 pr->id = cpu_index;
640
641
642
643
644
645
646 if (pr->id == -1) {
647 if (ACPI_FAILURE
648 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
649 return -ENODEV;
650 }
651 }
652
653
654
655
656
657
658
659
660
661 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
662 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
663 pr->acpi_id));
664
665 if (!object.processor.pblk_address)
666 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
667 else if (object.processor.pblk_length != 6)
668 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
669 object.processor.pblk_length);
670 else {
671 pr->throttling.address = object.processor.pblk_address;
672 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
673 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
674
675 pr->pblk = object.processor.pblk_address;
676
677
678
679
680
681
682
683
684 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
685 }
686
687
688
689
690
691
692 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
693 if (ACPI_SUCCESS(status))
694 arch_fix_phys_package_id(pr->id, object.integer.value);
695
696 return 0;
697}
698
699static DEFINE_PER_CPU(void *, processor_device_array);
700
701static int __cpuinit acpi_processor_start(struct acpi_device *device)
702{
703 int result = 0;
704 struct acpi_processor *pr;
705 struct sys_device *sysdev;
706
707 pr = acpi_driver_data(device);
708
709 result = acpi_processor_get_info(device);
710 if (result) {
711
712 return 0;
713 }
714
715 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
716
717
718
719
720
721
722 if (per_cpu(processor_device_array, pr->id) != NULL &&
723 per_cpu(processor_device_array, pr->id) != device) {
724 printk(KERN_WARNING "BIOS reported wrong ACPI id "
725 "for the processor\n");
726 return -ENODEV;
727 }
728 per_cpu(processor_device_array, pr->id) = device;
729
730 per_cpu(processors, pr->id) = pr;
731
732 result = acpi_processor_add_fs(device);
733 if (result)
734 goto end;
735
736 sysdev = get_cpu_sysdev(pr->id);
737 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
738 return -EFAULT;
739
740
741 arch_acpi_processor_init_pdc(pr);
742 acpi_processor_set_pdc(pr);
743 arch_acpi_processor_cleanup_pdc(pr);
744
745#ifdef CONFIG_CPU_FREQ
746 acpi_processor_ppc_has_changed(pr);
747#endif
748 acpi_processor_get_throttling_info(pr);
749 acpi_processor_get_limit_info(pr);
750
751
752 acpi_processor_power_init(pr, device);
753
754 pr->cdev = thermal_cooling_device_register("Processor", device,
755 &processor_cooling_ops);
756 if (IS_ERR(pr->cdev)) {
757 result = PTR_ERR(pr->cdev);
758 goto end;
759 }
760
761 dev_info(&device->dev, "registered as cooling_device%d\n",
762 pr->cdev->id);
763
764 result = sysfs_create_link(&device->dev.kobj,
765 &pr->cdev->device.kobj,
766 "thermal_cooling");
767 if (result)
768 printk(KERN_ERR PREFIX "Create sysfs link\n");
769 result = sysfs_create_link(&pr->cdev->device.kobj,
770 &device->dev.kobj,
771 "device");
772 if (result)
773 printk(KERN_ERR PREFIX "Create sysfs link\n");
774
775 if (pr->flags.throttling) {
776 printk(KERN_INFO PREFIX "%s [%s] (supports",
777 acpi_device_name(device), acpi_device_bid(device));
778 printk(" %d throttling states", pr->throttling.state_count);
779 printk(")\n");
780 }
781
782 end:
783
784 return result;
785}
786
787static void acpi_processor_notify(struct acpi_device *device, u32 event)
788{
789 struct acpi_processor *pr = acpi_driver_data(device);
790 int saved;
791
792 if (!pr)
793 return;
794
795 switch (event) {
796 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
797 saved = pr->performance_platform_limit;
798 acpi_processor_ppc_has_changed(pr);
799 if (saved == pr->performance_platform_limit)
800 break;
801 acpi_bus_generate_proc_event(device, event,
802 pr->performance_platform_limit);
803 acpi_bus_generate_netlink_event(device->pnp.device_class,
804 dev_name(&device->dev), event,
805 pr->performance_platform_limit);
806 break;
807 case ACPI_PROCESSOR_NOTIFY_POWER:
808 acpi_processor_cst_has_changed(pr);
809 acpi_bus_generate_proc_event(device, event, 0);
810 acpi_bus_generate_netlink_event(device->pnp.device_class,
811 dev_name(&device->dev), event, 0);
812 break;
813 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
814 acpi_processor_tstate_has_changed(pr);
815 acpi_bus_generate_proc_event(device, event, 0);
816 acpi_bus_generate_netlink_event(device->pnp.device_class,
817 dev_name(&device->dev), event, 0);
818 default:
819 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
820 "Unsupported event [0x%x]\n", event));
821 break;
822 }
823
824 return;
825}
826
827static int acpi_cpu_soft_notify(struct notifier_block *nfb,
828 unsigned long action, void *hcpu)
829{
830 unsigned int cpu = (unsigned long)hcpu;
831 struct acpi_processor *pr = per_cpu(processors, cpu);
832
833 if (action == CPU_ONLINE && pr) {
834 acpi_processor_ppc_has_changed(pr);
835 acpi_processor_cst_has_changed(pr);
836 acpi_processor_tstate_has_changed(pr);
837 }
838 return NOTIFY_OK;
839}
840
841static struct notifier_block acpi_cpu_notifier =
842{
843 .notifier_call = acpi_cpu_soft_notify,
844};
845
846static int acpi_processor_add(struct acpi_device *device)
847{
848 struct acpi_processor *pr = NULL;
849
850
851 if (!device)
852 return -EINVAL;
853
854 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
855 if (!pr)
856 return -ENOMEM;
857
858 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
859 kfree(pr);
860 return -ENOMEM;
861 }
862
863 pr->handle = device->handle;
864 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
865 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
866 device->driver_data = pr;
867
868 return 0;
869}
870
871static int acpi_processor_remove(struct acpi_device *device, int type)
872{
873 struct acpi_processor *pr = NULL;
874
875
876 if (!device || !acpi_driver_data(device))
877 return -EINVAL;
878
879 pr = acpi_driver_data(device);
880
881 if (pr->id >= nr_cpu_ids)
882 goto free;
883
884 if (type == ACPI_BUS_REMOVAL_EJECT) {
885 if (acpi_processor_handle_eject(pr))
886 return -EINVAL;
887 }
888
889 acpi_processor_power_exit(pr, device);
890
891 sysfs_remove_link(&device->dev.kobj, "sysdev");
892
893 acpi_processor_remove_fs(device);
894
895 if (pr->cdev) {
896 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
897 sysfs_remove_link(&pr->cdev->device.kobj, "device");
898 thermal_cooling_device_unregister(pr->cdev);
899 pr->cdev = NULL;
900 }
901
902 per_cpu(processors, pr->id) = NULL;
903 per_cpu(processor_device_array, pr->id) = NULL;
904
905free:
906 free_cpumask_var(pr->throttling.shared_cpu_map);
907 kfree(pr);
908
909 return 0;
910}
911
912#ifdef CONFIG_ACPI_HOTPLUG_CPU
913
914
915
916
917static int is_processor_present(acpi_handle handle)
918{
919 acpi_status status;
920 unsigned long long sta = 0;
921
922
923 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
924
925 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
926 return 1;
927
928
929
930
931 if (status == AE_NOT_FOUND)
932 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
933 "Processor does not support hot plug\n"));
934 else
935 ACPI_EXCEPTION((AE_INFO, status,
936 "Processor Device is not present"));
937 return 0;
938}
939
940static
941int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
942{
943 acpi_handle phandle;
944 struct acpi_device *pdev;
945 struct acpi_processor *pr;
946
947
948 if (acpi_get_parent(handle, &phandle)) {
949 return -ENODEV;
950 }
951
952 if (acpi_bus_get_device(phandle, &pdev)) {
953 return -ENODEV;
954 }
955
956 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
957 return -ENODEV;
958 }
959
960 acpi_bus_start(*device);
961
962 pr = acpi_driver_data(*device);
963 if (!pr)
964 return -ENODEV;
965
966 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
967 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
968 }
969 return 0;
970}
971
972static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
973 u32 event, void *data)
974{
975 struct acpi_processor *pr;
976 struct acpi_device *device = NULL;
977 int result;
978
979
980 switch (event) {
981 case ACPI_NOTIFY_BUS_CHECK:
982 case ACPI_NOTIFY_DEVICE_CHECK:
983 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
984 "Processor driver received %s event\n",
985 (event == ACPI_NOTIFY_BUS_CHECK) ?
986 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
987
988 if (!is_processor_present(handle))
989 break;
990
991 if (acpi_bus_get_device(handle, &device)) {
992 result = acpi_processor_device_add(handle, &device);
993 if (result)
994 printk(KERN_ERR PREFIX
995 "Unable to add the device\n");
996 break;
997 }
998
999 pr = acpi_driver_data(device);
1000 if (!pr) {
1001 printk(KERN_ERR PREFIX "Driver data is NULL\n");
1002 break;
1003 }
1004
1005 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
1006 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1007 break;
1008 }
1009
1010 result = acpi_processor_start(device);
1011 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
1012 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
1013 } else {
1014 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
1015 acpi_device_bid(device));
1016 }
1017 break;
1018 case ACPI_NOTIFY_EJECT_REQUEST:
1019 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1020 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
1021
1022 if (acpi_bus_get_device(handle, &device)) {
1023 printk(KERN_ERR PREFIX
1024 "Device don't exist, dropping EJECT\n");
1025 break;
1026 }
1027 pr = acpi_driver_data(device);
1028 if (!pr) {
1029 printk(KERN_ERR PREFIX
1030 "Driver data is NULL, dropping EJECT\n");
1031 return;
1032 }
1033
1034 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
1035 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1036 break;
1037 default:
1038 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1039 "Unsupported event [0x%x]\n", event));
1040 break;
1041 }
1042
1043 return;
1044}
1045
1046static acpi_status
1047processor_walk_namespace_cb(acpi_handle handle,
1048 u32 lvl, void *context, void **rv)
1049{
1050 acpi_status status;
1051 int *action = context;
1052 acpi_object_type type = 0;
1053
1054 status = acpi_get_type(handle, &type);
1055 if (ACPI_FAILURE(status))
1056 return (AE_OK);
1057
1058 if (type != ACPI_TYPE_PROCESSOR)
1059 return (AE_OK);
1060
1061 switch (*action) {
1062 case INSTALL_NOTIFY_HANDLER:
1063 acpi_install_notify_handler(handle,
1064 ACPI_SYSTEM_NOTIFY,
1065 acpi_processor_hotplug_notify,
1066 NULL);
1067 break;
1068 case UNINSTALL_NOTIFY_HANDLER:
1069 acpi_remove_notify_handler(handle,
1070 ACPI_SYSTEM_NOTIFY,
1071 acpi_processor_hotplug_notify);
1072 break;
1073 default:
1074 break;
1075 }
1076
1077 return (AE_OK);
1078}
1079
1080static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1081{
1082
1083 if (!is_processor_present(handle)) {
1084 return AE_ERROR;
1085 }
1086
1087 if (acpi_map_lsapic(handle, p_cpu))
1088 return AE_ERROR;
1089
1090 if (arch_register_cpu(*p_cpu)) {
1091 acpi_unmap_lsapic(*p_cpu);
1092 return AE_ERROR;
1093 }
1094
1095 return AE_OK;
1096}
1097
1098static int acpi_processor_handle_eject(struct acpi_processor *pr)
1099{
1100 if (cpu_online(pr->id))
1101 cpu_down(pr->id);
1102
1103 arch_unregister_cpu(pr->id);
1104 acpi_unmap_lsapic(pr->id);
1105 return (0);
1106}
1107#else
1108static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1109{
1110 return AE_ERROR;
1111}
1112static int acpi_processor_handle_eject(struct acpi_processor *pr)
1113{
1114 return (-EINVAL);
1115}
1116#endif
1117
1118static
1119void acpi_processor_install_hotplug_notify(void)
1120{
1121#ifdef CONFIG_ACPI_HOTPLUG_CPU
1122 int action = INSTALL_NOTIFY_HANDLER;
1123 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1124 ACPI_ROOT_OBJECT,
1125 ACPI_UINT32_MAX,
1126 processor_walk_namespace_cb, &action, NULL);
1127#endif
1128 register_hotcpu_notifier(&acpi_cpu_notifier);
1129}
1130
1131static
1132void acpi_processor_uninstall_hotplug_notify(void)
1133{
1134#ifdef CONFIG_ACPI_HOTPLUG_CPU
1135 int action = UNINSTALL_NOTIFY_HANDLER;
1136 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1137 ACPI_ROOT_OBJECT,
1138 ACPI_UINT32_MAX,
1139 processor_walk_namespace_cb, &action, NULL);
1140#endif
1141 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1142}
1143
1144
1145
1146
1147
1148
1149
1150static int __init acpi_processor_init(void)
1151{
1152 int result = 0;
1153
1154 if (acpi_disabled)
1155 return 0;
1156
1157 memset(&errata, 0, sizeof(errata));
1158
1159#ifdef CONFIG_SMP
1160 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1161 (struct acpi_table_header **)&madt)))
1162 madt = NULL;
1163#endif
1164
1165 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1166 if (!acpi_processor_dir)
1167 return -ENOMEM;
1168
1169
1170
1171
1172
1173 dmi_check_system(processor_idle_dmi_table);
1174 result = cpuidle_register_driver(&acpi_idle_driver);
1175 if (result < 0)
1176 goto out_proc;
1177
1178 result = acpi_bus_register_driver(&acpi_processor_driver);
1179 if (result < 0)
1180 goto out_cpuidle;
1181
1182 acpi_processor_install_hotplug_notify();
1183
1184 acpi_thermal_cpufreq_init();
1185
1186 acpi_processor_ppc_init();
1187
1188 acpi_processor_throttling_init();
1189
1190 return 0;
1191
1192out_cpuidle:
1193 cpuidle_unregister_driver(&acpi_idle_driver);
1194
1195out_proc:
1196 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1197
1198 return result;
1199}
1200
1201static void __exit acpi_processor_exit(void)
1202{
1203 if (acpi_disabled)
1204 return;
1205
1206 acpi_processor_ppc_exit();
1207
1208 acpi_thermal_cpufreq_exit();
1209
1210 acpi_processor_uninstall_hotplug_notify();
1211
1212 acpi_bus_unregister_driver(&acpi_processor_driver);
1213
1214 cpuidle_unregister_driver(&acpi_idle_driver);
1215
1216 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1217
1218 return;
1219}
1220
1221module_init(acpi_processor_init);
1222module_exit(acpi_processor_exit);
1223
1224EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1225
1226MODULE_ALIAS("processor");
1227
