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[ALSA] i2c: cs8427.c use put_unaligned helper
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / processor_core.c
blob9dd0fa93b9e1c1e2a9bd459638918ba47c25125e
1 /*
2 * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8 * - Added processor hotplug support
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 * TBD:
28 * 1. Make # power states dynamic.
29 * 2. Support duty_cycle values that span bit 4.
30 * 3. Optimize by having scheduler determine business instead of
31 * having us try to calculate it here.
32 * 4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
33 */
34
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/types.h>
39 #include <linux/pci.h>
40 #include <linux/pm.h>
41 #include <linux/cpufreq.h>
42 #include <linux/cpu.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/dmi.h>
46 #include <linux/moduleparam.h>
47 #include <linux/cpuidle.h>
48
49 #include <asm/io.h>
50 #include <asm/system.h>
51 #include <asm/cpu.h>
52 #include <asm/delay.h>
53 #include <asm/uaccess.h>
54 #include <asm/processor.h>
55 #include <asm/smp.h>
56 #include <asm/acpi.h>
57
58 #include <acpi/acpi_bus.h>
59 #include <acpi/acpi_drivers.h>
60 #include <acpi/processor.h>
61
62 #define ACPI_PROCESSOR_COMPONENT 0x01000000
63 #define ACPI_PROCESSOR_CLASS "processor"
64 #define ACPI_PROCESSOR_DEVICE_NAME "Processor"
65 #define ACPI_PROCESSOR_FILE_INFO "info"
66 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
67 #define ACPI_PROCESSOR_FILE_LIMIT "limit"
68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
69 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81
70 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
71
72 #define ACPI_PROCESSOR_LIMIT_USER 0
73 #define ACPI_PROCESSOR_LIMIT_THERMAL 1
74
75 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
76 ACPI_MODULE_NAME("processor_core");
77
78 MODULE_AUTHOR("Paul Diefenbaugh");
79 MODULE_DESCRIPTION("ACPI Processor Driver");
80 MODULE_LICENSE("GPL");
81
82 static int acpi_processor_add(struct acpi_device *device);
83 static int acpi_processor_start(struct acpi_device *device);
84 static int acpi_processor_remove(struct acpi_device *device, int type);
85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
86 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
87 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
88 static int acpi_processor_handle_eject(struct acpi_processor *pr);
89
90
91 static const struct acpi_device_id processor_device_ids[] = {
92 {ACPI_PROCESSOR_HID, 0},
93 {"", 0},
94 };
95 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
96
97 static struct acpi_driver acpi_processor_driver = {
98 .name = "processor",
99 .class = ACPI_PROCESSOR_CLASS,
100 .ids = processor_device_ids,
101 .ops = {
102 .add = acpi_processor_add,
103 .remove = acpi_processor_remove,
104 .start = acpi_processor_start,
105 .suspend = acpi_processor_suspend,
106 .resume = acpi_processor_resume,
107 },
108 };
109
110 #define INSTALL_NOTIFY_HANDLER 1
111 #define UNINSTALL_NOTIFY_HANDLER 2
112
113 static const struct file_operations acpi_processor_info_fops = {
114 .owner = THIS_MODULE,
115 .open = acpi_processor_info_open_fs,
116 .read = seq_read,
117 .llseek = seq_lseek,
118 .release = single_release,
119 };
120
121 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 = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
330 S_IRUGO, acpi_device_dir(device),
331 &acpi_processor_info_fops,
332 acpi_driver_data(device));
333 if (!entry)
334 return -EIO;
335
336 /* 'throttling' [R/W] */
337 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
338 S_IFREG | S_IRUGO | S_IWUSR,
339 acpi_device_dir(device),
340 &acpi_processor_throttling_fops,
341 acpi_driver_data(device));
342 if (!entry)
343 return -EIO;
344
345 /* 'limit' [R/W] */
346 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
347 S_IFREG | S_IRUGO | S_IWUSR,
348 acpi_device_dir(device),
349 &acpi_processor_limit_fops,
350 acpi_driver_data(device));
351 if (!entry)
352 return -EIO;
353 return 0;
354 }
355
356 static int acpi_processor_remove_fs(struct acpi_device *device)
357 {
358
359 if (acpi_device_dir(device)) {
360 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
361 acpi_device_dir(device));
362 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
363 acpi_device_dir(device));
364 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
365 acpi_device_dir(device));
366 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
367 acpi_device_dir(device) = NULL;
368 }
369
370 return 0;
371 }
372
373 /* Use the acpiid in MADT to map cpus in case of SMP */
374
375 #ifndef CONFIG_SMP
376 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
377 #else
378
379 static struct acpi_table_madt *madt;
380
381 static int map_lapic_id(struct acpi_subtable_header *entry,
382 u32 acpi_id, int *apic_id)
383 {
384 struct acpi_madt_local_apic *lapic =
385 (struct acpi_madt_local_apic *)entry;
386 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
387 lapic->processor_id == acpi_id) {
388 *apic_id = lapic->id;
389 return 1;
390 }
391 return 0;
392 }
393
394 static int map_lsapic_id(struct acpi_subtable_header *entry,
395 u32 acpi_id, int *apic_id)
396 {
397 struct acpi_madt_local_sapic *lsapic =
398 (struct acpi_madt_local_sapic *)entry;
399 /* Only check enabled APICs*/
400 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
401 /* First check against id */
402 if (lsapic->processor_id == acpi_id) {
403 *apic_id = (lsapic->id << 8) | lsapic->eid;
404 return 1;
405 /* Check against optional uid */
406 } else if (entry->length >= 16 &&
407 lsapic->uid == acpi_id) {
408 *apic_id = lsapic->uid;
409 return 1;
410 }
411 }
412 return 0;
413 }
414
415 static int map_madt_entry(u32 acpi_id)
416 {
417 unsigned long madt_end, entry;
418 int apic_id = -1;
419
420 if (!madt)
421 return apic_id;
422
423 entry = (unsigned long)madt;
424 madt_end = entry + madt->header.length;
425
426 /* Parse all entries looking for a match. */
427
428 entry += sizeof(struct acpi_table_madt);
429 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
430 struct acpi_subtable_header *header =
431 (struct acpi_subtable_header *)entry;
432 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
433 if (map_lapic_id(header, acpi_id, &apic_id))
434 break;
435 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
436 if (map_lsapic_id(header, acpi_id, &apic_id))
437 break;
438 }
439 entry += header->length;
440 }
441 return apic_id;
442 }
443
444 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
445 {
446 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
447 union acpi_object *obj;
448 struct acpi_subtable_header *header;
449 int apic_id = -1;
450
451 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
452 goto exit;
453
454 if (!buffer.length || !buffer.pointer)
455 goto exit;
456
457 obj = buffer.pointer;
458 if (obj->type != ACPI_TYPE_BUFFER ||
459 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
460 goto exit;
461 }
462
463 header = (struct acpi_subtable_header *)obj->buffer.pointer;
464 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
465 map_lapic_id(header, acpi_id, &apic_id);
466 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
467 map_lsapic_id(header, acpi_id, &apic_id);
468 }
469
470 exit:
471 if (buffer.pointer)
472 kfree(buffer.pointer);
473 return apic_id;
474 }
475
476 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
477 {
478 int i;
479 int apic_id = -1;
480
481 apic_id = map_mat_entry(handle, acpi_id);
482 if (apic_id == -1)
483 apic_id = map_madt_entry(acpi_id);
484 if (apic_id == -1)
485 return apic_id;
486
487 for_each_possible_cpu(i) {
488 if (cpu_physical_id(i) == apic_id)
489 return i;
490 }
491 return -1;
492 }
493 #endif
494
495 /* --------------------------------------------------------------------------
496 Driver Interface
497 -------------------------------------------------------------------------- */
498
499 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
500 {
501 acpi_status status = 0;
502 union acpi_object object = { 0 };
503 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
504 int cpu_index;
505 static int cpu0_initialized;
506
507
508 if (!pr)
509 return -EINVAL;
510
511 if (num_online_cpus() > 1)
512 errata.smp = TRUE;
513
514 acpi_processor_errata(pr);
515
516 /*
517 * Check to see if we have bus mastering arbitration control. This
518 * is required for proper C3 usage (to maintain cache coherency).
519 */
520 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
521 pr->flags.bm_control = 1;
522 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
523 "Bus mastering arbitration control present\n"));
524 } else
525 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
526 "No bus mastering arbitration control\n"));
527
528 /* Check if it is a Device with HID and UID */
529 if (has_uid) {
530 unsigned long value;
531 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
532 NULL, &value);
533 if (ACPI_FAILURE(status)) {
534 printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
535 return -ENODEV;
536 }
537 pr->acpi_id = value;
538 } else {
539 /*
540 * Evalute the processor object. Note that it is common on SMP to
541 * have the first (boot) processor with a valid PBLK address while
542 * all others have a NULL address.
543 */
544 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
545 if (ACPI_FAILURE(status)) {
546 printk(KERN_ERR PREFIX "Evaluating processor object\n");
547 return -ENODEV;
548 }
549
550 /*
551 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
552 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
553 */
554 pr->acpi_id = object.processor.proc_id;
555 }
556 cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
557
558 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
559 if (!cpu0_initialized && (cpu_index == -1) &&
560 (num_online_cpus() == 1)) {
561 cpu_index = 0;
562 }
563
564 cpu0_initialized = 1;
565
566 pr->id = cpu_index;
567
568 /*
569 * Extra Processor objects may be enumerated on MP systems with
570 * less than the max # of CPUs. They should be ignored _iff
571 * they are physically not present.
572 */
573 if (pr->id == -1) {
574 if (ACPI_FAILURE
575 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
576 return -ENODEV;
577 }
578 }
579
580 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
581 pr->acpi_id));
582
583 if (!object.processor.pblk_address)
584 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
585 else if (object.processor.pblk_length != 6)
586 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
587 object.processor.pblk_length);
588 else {
589 pr->throttling.address = object.processor.pblk_address;
590 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
591 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
592
593 pr->pblk = object.processor.pblk_address;
594
595 /*
596 * We don't care about error returns - we just try to mark
597 * these reserved so that nobody else is confused into thinking
598 * that this region might be unused..
599 *
600 * (In particular, allocating the IO range for Cardbus)
601 */
602 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
603 }
604
605 /*
606 * If ACPI describes a slot number for this CPU, we can use it
607 * ensure we get the right value in the "physical id" field
608 * of /proc/cpuinfo
609 */
610 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
611 if (ACPI_SUCCESS(status))
612 arch_fix_phys_package_id(pr->id, object.integer.value);
613
614 return 0;
615 }
616
617 static void *processor_device_array[NR_CPUS];
618
619 static int __cpuinit acpi_processor_start(struct acpi_device *device)
620 {
621 int result = 0;
622 acpi_status status = AE_OK;
623 struct acpi_processor *pr;
624
625
626 pr = acpi_driver_data(device);
627
628 result = acpi_processor_get_info(pr, device->flags.unique_id);
629 if (result) {
630 /* Processor is physically not present */
631 return 0;
632 }
633
634 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
635
636 /*
637 * Buggy BIOS check
638 * ACPI id of processors can be reported wrongly by the BIOS.
639 * Don't trust it blindly
640 */
641 if (processor_device_array[pr->id] != NULL &&
642 processor_device_array[pr->id] != device) {
643 printk(KERN_WARNING "BIOS reported wrong ACPI id "
644 "for the processor\n");
645 return -ENODEV;
646 }
647 processor_device_array[pr->id] = device;
648
649 processors[pr->id] = pr;
650
651 result = acpi_processor_add_fs(device);
652 if (result)
653 goto end;
654
655 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
656 acpi_processor_notify, pr);
657
658 /* _PDC call should be done before doing anything else (if reqd.). */
659 arch_acpi_processor_init_pdc(pr);
660 acpi_processor_set_pdc(pr);
661 #ifdef CONFIG_CPU_FREQ
662 acpi_processor_ppc_has_changed(pr);
663 #endif
664 acpi_processor_get_throttling_info(pr);
665 acpi_processor_get_limit_info(pr);
666
667
668 acpi_processor_power_init(pr, device);
669
670 pr->cdev = thermal_cooling_device_register("Processor", device,
671 &processor_cooling_ops);
672 if (IS_ERR(pr->cdev)) {
673 result = PTR_ERR(pr->cdev);
674 goto end;
675 }
676
677 printk(KERN_INFO PREFIX
678 "%s is registered as cooling_device%d\n",
679 device->dev.bus_id, pr->cdev->id);
680
681 result = sysfs_create_link(&device->dev.kobj,
682 &pr->cdev->device.kobj,
683 "thermal_cooling");
684 if (result)
685 printk(KERN_ERR PREFIX "Create sysfs link\n");
686 result = sysfs_create_link(&pr->cdev->device.kobj,
687 &device->dev.kobj,
688 "device");
689 if (result)
690 printk(KERN_ERR PREFIX "Create sysfs link\n");
691
692 if (pr->flags.throttling) {
693 printk(KERN_INFO PREFIX "%s [%s] (supports",
694 acpi_device_name(device), acpi_device_bid(device));
695 printk(" %d throttling states", pr->throttling.state_count);
696 printk(")\n");
697 }
698
699 end:
700
701 return result;
702 }
703
704 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
705 {
706 struct acpi_processor *pr = data;
707 struct acpi_device *device = NULL;
708 int saved;
709
710 if (!pr)
711 return;
712
713 if (acpi_bus_get_device(pr->handle, &device))
714 return;
715
716 switch (event) {
717 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
718 saved = pr->performance_platform_limit;
719 acpi_processor_ppc_has_changed(pr);
720 if (saved == pr->performance_platform_limit)
721 break;
722 acpi_bus_generate_proc_event(device, event,
723 pr->performance_platform_limit);
724 acpi_bus_generate_netlink_event(device->pnp.device_class,
725 device->dev.bus_id, event,
726 pr->performance_platform_limit);
727 break;
728 case ACPI_PROCESSOR_NOTIFY_POWER:
729 acpi_processor_cst_has_changed(pr);
730 acpi_bus_generate_proc_event(device, event, 0);
731 acpi_bus_generate_netlink_event(device->pnp.device_class,
732 device->dev.bus_id, event, 0);
733 break;
734 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
735 acpi_processor_tstate_has_changed(pr);
736 acpi_bus_generate_proc_event(device, event, 0);
737 acpi_bus_generate_netlink_event(device->pnp.device_class,
738 device->dev.bus_id, event, 0);
739 default:
740 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
741 "Unsupported event [0x%x]\n", event));
742 break;
743 }
744
745 return;
746 }
747
748 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
749 unsigned long action, void *hcpu)
750 {
751 unsigned int cpu = (unsigned long)hcpu;
752 struct acpi_processor *pr = processors[cpu];
753
754 if (action == CPU_ONLINE && pr) {
755 acpi_processor_ppc_has_changed(pr);
756 acpi_processor_cst_has_changed(pr);
757 acpi_processor_tstate_has_changed(pr);
758 }
759 return NOTIFY_OK;
760 }
761
762 static struct notifier_block acpi_cpu_notifier =
763 {
764 .notifier_call = acpi_cpu_soft_notify,
765 };
766
767 static int acpi_processor_add(struct acpi_device *device)
768 {
769 struct acpi_processor *pr = NULL;
770
771
772 if (!device)
773 return -EINVAL;
774
775 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
776 if (!pr)
777 return -ENOMEM;
778
779 pr->handle = device->handle;
780 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
781 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
782 acpi_driver_data(device) = pr;
783
784 return 0;
785 }
786
787 static int acpi_processor_remove(struct acpi_device *device, int type)
788 {
789 acpi_status status = AE_OK;
790 struct acpi_processor *pr = NULL;
791
792
793 if (!device || !acpi_driver_data(device))
794 return -EINVAL;
795
796 pr = acpi_driver_data(device);
797
798 if (pr->id >= nr_cpu_ids) {
799 kfree(pr);
800 return 0;
801 }
802
803 if (type == ACPI_BUS_REMOVAL_EJECT) {
804 if (acpi_processor_handle_eject(pr))
805 return -EINVAL;
806 }
807
808 acpi_processor_power_exit(pr, device);
809
810 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
811 acpi_processor_notify);
812
813 acpi_processor_remove_fs(device);
814
815 if (pr->cdev) {
816 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
817 sysfs_remove_link(&pr->cdev->device.kobj, "device");
818 thermal_cooling_device_unregister(pr->cdev);
819 pr->cdev = NULL;
820 }
821
822 processors[pr->id] = NULL;
823 processor_device_array[pr->id] = NULL;
824 kfree(pr);
825
826 return 0;
827 }
828
829 #ifdef CONFIG_ACPI_HOTPLUG_CPU
830 /****************************************************************************
831 * Acpi processor hotplug support *
832 ****************************************************************************/
833
834 static int is_processor_present(acpi_handle handle)
835 {
836 acpi_status status;
837 unsigned long sta = 0;
838
839
840 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
841
842 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
843 return 1;
844
845 /*
846 * _STA is mandatory for a processor that supports hot plug
847 */
848 if (status == AE_NOT_FOUND)
849 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
850 "Processor does not support hot plug\n"));
851 else
852 ACPI_EXCEPTION((AE_INFO, status,
853 "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 __ref acpi_processor_hotplug_notify(acpi_handle handle,
890 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 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
901 "Processor driver received %s event\n",
902 (event == ACPI_NOTIFY_BUS_CHECK) ?
903 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
904
905 if (!is_processor_present(handle))
906 break;
907
908 if (acpi_bus_get_device(handle, &device)) {
909 result = acpi_processor_device_add(handle, &device);
910 if (result)
911 printk(KERN_ERR PREFIX
912 "Unable to add the device\n");
913 break;
914 }
915
916 pr = acpi_driver_data(device);
917 if (!pr) {
918 printk(KERN_ERR PREFIX "Driver data is NULL\n");
919 break;
920 }
921
922 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
923 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
924 break;
925 }
926
927 result = acpi_processor_start(device);
928 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
929 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
930 } else {
931 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
932 acpi_device_bid(device));
933 }
934 break;
935 case ACPI_NOTIFY_EJECT_REQUEST:
936 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
937 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
938
939 if (acpi_bus_get_device(handle, &device)) {
940 printk(KERN_ERR PREFIX
941 "Device don't exist, dropping EJECT\n");
942 break;
943 }
944 pr = acpi_driver_data(device);
945 if (!pr) {
946 printk(KERN_ERR PREFIX
947 "Driver data is NULL, dropping EJECT\n");
948 return;
949 }
950
951 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
952 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
953 break;
954 default:
955 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
956 "Unsupported event [0x%x]\n", event));
957 break;
958 }
959
960 return;
961 }
962
963 static acpi_status
964 processor_walk_namespace_cb(acpi_handle handle,
965 u32 lvl, void *context, void **rv)
966 {
967 acpi_status status;
968 int *action = context;
969 acpi_object_type type = 0;
970
971 status = acpi_get_type(handle, &type);
972 if (ACPI_FAILURE(status))
973 return (AE_OK);
974
975 if (type != ACPI_TYPE_PROCESSOR)
976 return (AE_OK);
977
978 switch (*action) {
979 case INSTALL_NOTIFY_HANDLER:
980 acpi_install_notify_handler(handle,
981 ACPI_SYSTEM_NOTIFY,
982 acpi_processor_hotplug_notify,
983 NULL);
984 break;
985 case UNINSTALL_NOTIFY_HANDLER:
986 acpi_remove_notify_handler(handle,
987 ACPI_SYSTEM_NOTIFY,
988 acpi_processor_hotplug_notify);
989 break;
990 default:
991 break;
992 }
993
994 return (AE_OK);
995 }
996
997 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
998 {
999
1000 if (!is_processor_present(handle)) {
1001 return AE_ERROR;
1002 }
1003
1004 if (acpi_map_lsapic(handle, p_cpu))
1005 return AE_ERROR;
1006
1007 if (arch_register_cpu(*p_cpu)) {
1008 acpi_unmap_lsapic(*p_cpu);
1009 return AE_ERROR;
1010 }
1011
1012 return AE_OK;
1013 }
1014
1015 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1016 {
1017 if (cpu_online(pr->id)) {
1018 return (-EINVAL);
1019 }
1020 arch_unregister_cpu(pr->id);
1021 acpi_unmap_lsapic(pr->id);
1022 return (0);
1023 }
1024 #else
1025 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1026 {
1027 return AE_ERROR;
1028 }
1029 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1030 {
1031 return (-EINVAL);
1032 }
1033 #endif
1034
1035 static
1036 void acpi_processor_install_hotplug_notify(void)
1037 {
1038 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1039 int action = INSTALL_NOTIFY_HANDLER;
1040 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1041 ACPI_ROOT_OBJECT,
1042 ACPI_UINT32_MAX,
1043 processor_walk_namespace_cb, &action, NULL);
1044 #endif
1045 register_hotcpu_notifier(&acpi_cpu_notifier);
1046 }
1047
1048 static
1049 void acpi_processor_uninstall_hotplug_notify(void)
1050 {
1051 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1052 int action = UNINSTALL_NOTIFY_HANDLER;
1053 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1054 ACPI_ROOT_OBJECT,
1055 ACPI_UINT32_MAX,
1056 processor_walk_namespace_cb, &action, NULL);
1057 #endif
1058 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1059 }
1060
1061 /*
1062 * We keep the driver loaded even when ACPI is not running.
1063 * This is needed for the powernow-k8 driver, that works even without
1064 * ACPI, but needs symbols from this driver
1065 */
1066
1067 static int __init acpi_processor_init(void)
1068 {
1069 int result = 0;
1070
1071
1072 memset(&processors, 0, sizeof(processors));
1073 memset(&errata, 0, sizeof(errata));
1074
1075 #ifdef CONFIG_SMP
1076 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1077 (struct acpi_table_header **)&madt)))
1078 madt = NULL;
1079 #endif
1080
1081 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1082 if (!acpi_processor_dir)
1083 return -ENOMEM;
1084 acpi_processor_dir->owner = THIS_MODULE;
1085
1086 result = cpuidle_register_driver(&acpi_idle_driver);
1087 if (result < 0)
1088 goto out_proc;
1089
1090 result = acpi_bus_register_driver(&acpi_processor_driver);
1091 if (result < 0)
1092 goto out_cpuidle;
1093
1094 acpi_processor_install_hotplug_notify();
1095
1096 acpi_thermal_cpufreq_init();
1097
1098 acpi_processor_ppc_init();
1099
1100 acpi_processor_throttling_init();
1101
1102 return 0;
1103
1104 out_cpuidle:
1105 cpuidle_unregister_driver(&acpi_idle_driver);
1106
1107 out_proc:
1108 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1109
1110 return result;
1111 }
1112
1113 static void __exit acpi_processor_exit(void)
1114 {
1115 acpi_processor_ppc_exit();
1116
1117 acpi_thermal_cpufreq_exit();
1118
1119 acpi_processor_uninstall_hotplug_notify();
1120
1121 acpi_bus_unregister_driver(&acpi_processor_driver);
1122
1123 cpuidle_unregister_driver(&acpi_idle_driver);
1124
1125 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1126
1127 return;
1128 }
1129
1130 module_init(acpi_processor_init);
1131 module_exit(acpi_processor_exit);
1132
1133 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1134
1135 MODULE_ALIAS("processor");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree