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Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / drivers / acpi / processor_core.c
blob8c4aa11d283966ee2d7a353c0a76d7d77919bed2
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 <<<<<<< HEAD:drivers/acpi/processor_core.c
674 if (pr->cdev)
675 =======
676 if (IS_ERR(pr->cdev)) {
677 result = PTR_ERR(pr->cdev);
678 goto end;
679 }
680 if (pr->cdev) {
681 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/processor_core.c
682 printk(KERN_INFO PREFIX
683 "%s is registered as cooling_device%d\n",
684 device->dev.bus_id, pr->cdev->id);
685 <<<<<<< HEAD:drivers/acpi/processor_core.c
686 else
687 goto end;
688 =======
689 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/processor_core.c
690
691 <<<<<<< HEAD:drivers/acpi/processor_core.c
692 result = sysfs_create_link(&device->dev.kobj, &pr->cdev->device.kobj,
693 "thermal_cooling");
694 if (result)
695 return result;
696 result = sysfs_create_link(&pr->cdev->device.kobj, &device->dev.kobj,
697 "device");
698 if (result)
699 return result;
700 =======
701 result = sysfs_create_link(&device->dev.kobj,
702 &pr->cdev->device.kobj,
703 "thermal_cooling");
704 if (result)
705 return result;
706 result = sysfs_create_link(&pr->cdev->device.kobj,
707 &device->dev.kobj,
708 "device");
709 if (result)
710 return result;
711 }
712 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/processor_core.c
713
714 if (pr->flags.throttling) {
715 printk(KERN_INFO PREFIX "%s [%s] (supports",
716 acpi_device_name(device), acpi_device_bid(device));
717 printk(" %d throttling states", pr->throttling.state_count);
718 printk(")\n");
719 }
720
721 end:
722
723 return result;
724 }
725
726 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
727 {
728 struct acpi_processor *pr = data;
729 struct acpi_device *device = NULL;
730 int saved;
731
732 if (!pr)
733 return;
734
735 if (acpi_bus_get_device(pr->handle, &device))
736 return;
737
738 switch (event) {
739 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
740 saved = pr->performance_platform_limit;
741 acpi_processor_ppc_has_changed(pr);
742 if (saved == pr->performance_platform_limit)
743 break;
744 acpi_bus_generate_proc_event(device, event,
745 pr->performance_platform_limit);
746 acpi_bus_generate_netlink_event(device->pnp.device_class,
747 device->dev.bus_id, event,
748 pr->performance_platform_limit);
749 break;
750 case ACPI_PROCESSOR_NOTIFY_POWER:
751 acpi_processor_cst_has_changed(pr);
752 acpi_bus_generate_proc_event(device, event, 0);
753 acpi_bus_generate_netlink_event(device->pnp.device_class,
754 device->dev.bus_id, event, 0);
755 break;
756 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
757 acpi_processor_tstate_has_changed(pr);
758 acpi_bus_generate_proc_event(device, event, 0);
759 acpi_bus_generate_netlink_event(device->pnp.device_class,
760 device->dev.bus_id, event, 0);
761 default:
762 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
763 "Unsupported event [0x%x]\n", event));
764 break;
765 }
766
767 return;
768 }
769
770 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
771 unsigned long action, void *hcpu)
772 {
773 unsigned int cpu = (unsigned long)hcpu;
774 struct acpi_processor *pr = processors[cpu];
775
776 if (action == CPU_ONLINE && pr) {
777 acpi_processor_ppc_has_changed(pr);
778 acpi_processor_cst_has_changed(pr);
779 acpi_processor_tstate_has_changed(pr);
780 }
781 return NOTIFY_OK;
782 }
783
784 static struct notifier_block acpi_cpu_notifier =
785 {
786 .notifier_call = acpi_cpu_soft_notify,
787 };
788
789 static int acpi_processor_add(struct acpi_device *device)
790 {
791 struct acpi_processor *pr = NULL;
792
793
794 if (!device)
795 return -EINVAL;
796
797 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
798 if (!pr)
799 return -ENOMEM;
800
801 pr->handle = device->handle;
802 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
803 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
804 acpi_driver_data(device) = pr;
805
806 return 0;
807 }
808
809 static int acpi_processor_remove(struct acpi_device *device, int type)
810 {
811 acpi_status status = AE_OK;
812 struct acpi_processor *pr = NULL;
813
814
815 if (!device || !acpi_driver_data(device))
816 return -EINVAL;
817
818 pr = acpi_driver_data(device);
819
820 if (pr->id >= nr_cpu_ids) {
821 kfree(pr);
822 return 0;
823 }
824
825 if (type == ACPI_BUS_REMOVAL_EJECT) {
826 if (acpi_processor_handle_eject(pr))
827 return -EINVAL;
828 }
829
830 acpi_processor_power_exit(pr, device);
831
832 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
833 acpi_processor_notify);
834
835 acpi_processor_remove_fs(device);
836
837 <<<<<<< HEAD:drivers/acpi/processor_core.c
838 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
839 sysfs_remove_link(&pr->cdev->device.kobj, "device");
840 thermal_cooling_device_unregister(pr->cdev);
841 pr->cdev = NULL;
842 =======
843 if (pr->cdev) {
844 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
845 sysfs_remove_link(&pr->cdev->device.kobj, "device");
846 thermal_cooling_device_unregister(pr->cdev);
847 pr->cdev = NULL;
848 }
849 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/processor_core.c
850
851 processors[pr->id] = NULL;
852
853 kfree(pr);
854
855 return 0;
856 }
857
858 #ifdef CONFIG_ACPI_HOTPLUG_CPU
859 /****************************************************************************
860 * Acpi processor hotplug support *
861 ****************************************************************************/
862
863 <<<<<<< HEAD:drivers/acpi/processor_core.c
864 static int is_processor_present(acpi_handle handle);
865
866 =======
867 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/processor_core.c
868 static int is_processor_present(acpi_handle handle)
869 {
870 acpi_status status;
871 unsigned long sta = 0;
872
873
874 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
875 <<<<<<< HEAD:drivers/acpi/processor_core.c
876 /*
877 * if a processor object does not have an _STA object,
878 * OSPM assumes that the processor is present.
879 */
880 if (status == AE_NOT_FOUND)
881 return 1;
882 =======
883 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/processor_core.c
884
885 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
886 return 1;
887
888 <<<<<<< HEAD:drivers/acpi/processor_core.c
889 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
890 =======
891 /*
892 * _STA is mandatory for a processor that supports hot plug
893 */
894 if (status == AE_NOT_FOUND)
895 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
896 "Processor does not support hot plug\n"));
897 else
898 ACPI_EXCEPTION((AE_INFO, status,
899 "Processor Device is not present"));
900 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/processor_core.c
901 return 0;
902 }
903
904 static
905 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
906 {
907 acpi_handle phandle;
908 struct acpi_device *pdev;
909 struct acpi_processor *pr;
910
911
912 if (acpi_get_parent(handle, &phandle)) {
913 return -ENODEV;
914 }
915
916 if (acpi_bus_get_device(phandle, &pdev)) {
917 return -ENODEV;
918 }
919
920 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
921 return -ENODEV;
922 }
923
924 acpi_bus_start(*device);
925
926 pr = acpi_driver_data(*device);
927 if (!pr)
928 return -ENODEV;
929
930 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
931 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
932 }
933 return 0;
934 }
935
936 <<<<<<< HEAD:drivers/acpi/processor_core.c
937 static void
938 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
939 =======
940 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
941 u32 event, void *data)
942 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/processor_core.c
943 {
944 struct acpi_processor *pr;
945 struct acpi_device *device = NULL;
946 int result;
947
948
949 switch (event) {
950 case ACPI_NOTIFY_BUS_CHECK:
951 case ACPI_NOTIFY_DEVICE_CHECK:
952 <<<<<<< HEAD:drivers/acpi/processor_core.c
953 printk("Processor driver received %s event\n",
954 =======
955 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
956 "Processor driver received %s event\n",
957 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/processor_core.c
958 (event == ACPI_NOTIFY_BUS_CHECK) ?
959 <<<<<<< HEAD:drivers/acpi/processor_core.c
960 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
961 =======
962 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
963 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/processor_core.c
964
965 if (!is_processor_present(handle))
966 break;
967
968 if (acpi_bus_get_device(handle, &device)) {
969 result = acpi_processor_device_add(handle, &device);
970 if (result)
971 printk(KERN_ERR PREFIX
972 "Unable to add the device\n");
973 break;
974 }
975
976 pr = acpi_driver_data(device);
977 if (!pr) {
978 printk(KERN_ERR PREFIX "Driver data is NULL\n");
979 break;
980 }
981
982 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
983 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
984 break;
985 }
986
987 result = acpi_processor_start(device);
988 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
989 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
990 } else {
991 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
992 acpi_device_bid(device));
993 }
994 break;
995 case ACPI_NOTIFY_EJECT_REQUEST:
996 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
997 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
998
999 if (acpi_bus_get_device(handle, &device)) {
1000 printk(KERN_ERR PREFIX
1001 "Device don't exist, dropping EJECT\n");
1002 break;
1003 }
1004 pr = acpi_driver_data(device);
1005 if (!pr) {
1006 printk(KERN_ERR PREFIX
1007 "Driver data is NULL, dropping EJECT\n");
1008 return;
1009 }
1010
1011 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
1012 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1013 break;
1014 default:
1015 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1016 "Unsupported event [0x%x]\n", event));
1017 break;
1018 }
1019
1020 return;
1021 }
1022
1023 static acpi_status
1024 processor_walk_namespace_cb(acpi_handle handle,
1025 u32 lvl, void *context, void **rv)
1026 {
1027 acpi_status status;
1028 int *action = context;
1029 acpi_object_type type = 0;
1030
1031 status = acpi_get_type(handle, &type);
1032 if (ACPI_FAILURE(status))
1033 return (AE_OK);
1034
1035 if (type != ACPI_TYPE_PROCESSOR)
1036 return (AE_OK);
1037
1038 switch (*action) {
1039 case INSTALL_NOTIFY_HANDLER:
1040 acpi_install_notify_handler(handle,
1041 ACPI_SYSTEM_NOTIFY,
1042 acpi_processor_hotplug_notify,
1043 NULL);
1044 break;
1045 case UNINSTALL_NOTIFY_HANDLER:
1046 acpi_remove_notify_handler(handle,
1047 ACPI_SYSTEM_NOTIFY,
1048 acpi_processor_hotplug_notify);
1049 break;
1050 default:
1051 break;
1052 }
1053
1054 return (AE_OK);
1055 }
1056
1057 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1058 {
1059
1060 if (!is_processor_present(handle)) {
1061 return AE_ERROR;
1062 }
1063
1064 if (acpi_map_lsapic(handle, p_cpu))
1065 return AE_ERROR;
1066
1067 if (arch_register_cpu(*p_cpu)) {
1068 acpi_unmap_lsapic(*p_cpu);
1069 return AE_ERROR;
1070 }
1071
1072 return AE_OK;
1073 }
1074
1075 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1076 {
1077 if (cpu_online(pr->id)) {
1078 return (-EINVAL);
1079 }
1080 arch_unregister_cpu(pr->id);
1081 acpi_unmap_lsapic(pr->id);
1082 return (0);
1083 }
1084 #else
1085 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1086 {
1087 return AE_ERROR;
1088 }
1089 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1090 {
1091 return (-EINVAL);
1092 }
1093 #endif
1094
1095 static
1096 void acpi_processor_install_hotplug_notify(void)
1097 {
1098 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1099 int action = INSTALL_NOTIFY_HANDLER;
1100 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1101 ACPI_ROOT_OBJECT,
1102 ACPI_UINT32_MAX,
1103 processor_walk_namespace_cb, &action, NULL);
1104 #endif
1105 register_hotcpu_notifier(&acpi_cpu_notifier);
1106 }
1107
1108 static
1109 void acpi_processor_uninstall_hotplug_notify(void)
1110 {
1111 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1112 int action = UNINSTALL_NOTIFY_HANDLER;
1113 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1114 ACPI_ROOT_OBJECT,
1115 ACPI_UINT32_MAX,
1116 processor_walk_namespace_cb, &action, NULL);
1117 #endif
1118 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1119 }
1120
1121 /*
1122 * We keep the driver loaded even when ACPI is not running.
1123 * This is needed for the powernow-k8 driver, that works even without
1124 * ACPI, but needs symbols from this driver
1125 */
1126
1127 static int __init acpi_processor_init(void)
1128 {
1129 int result = 0;
1130
1131
1132 memset(&processors, 0, sizeof(processors));
1133 memset(&errata, 0, sizeof(errata));
1134
1135 #ifdef CONFIG_SMP
1136 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1137 (struct acpi_table_header **)&madt)))
1138 madt = NULL;
1139 #endif
1140
1141 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1142 if (!acpi_processor_dir)
1143 return -ENOMEM;
1144 acpi_processor_dir->owner = THIS_MODULE;
1145
1146 result = cpuidle_register_driver(&acpi_idle_driver);
1147 if (result < 0)
1148 goto out_proc;
1149
1150 result = acpi_bus_register_driver(&acpi_processor_driver);
1151 if (result < 0)
1152 goto out_cpuidle;
1153
1154 acpi_processor_install_hotplug_notify();
1155
1156 acpi_thermal_cpufreq_init();
1157
1158 acpi_processor_ppc_init();
1159
1160 acpi_processor_throttling_init();
1161
1162 return 0;
1163
1164 out_cpuidle:
1165 cpuidle_unregister_driver(&acpi_idle_driver);
1166
1167 out_proc:
1168 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1169
1170 return result;
1171 }
1172
1173 static void __exit acpi_processor_exit(void)
1174 {
1175 acpi_processor_ppc_exit();
1176
1177 acpi_thermal_cpufreq_exit();
1178
1179 acpi_processor_uninstall_hotplug_notify();
1180
1181 acpi_bus_unregister_driver(&acpi_processor_driver);
1182
1183 cpuidle_unregister_driver(&acpi_idle_driver);
1184
1185 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1186
1187 return;
1188 }
1189
1190 module_init(acpi_processor_init);
1191 module_exit(acpi_processor_exit);
1192
1193 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1194
1195 MODULE_ALIAS("processor");
WRT350N Kernel Patches