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ACPI: fix checkpatch.pl complaints in scan.c
[linux-2.6/mini2440.git] / drivers / acpi / processor_core.c
blob9a803f85ccfe340e7c5430ea223edae4528a27bf
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 DEFINE_PER_CPU(struct acpi_processor *, processors);
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 DEFINE_PER_CPU(void *, processor_device_array);
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 struct sys_device *sysdev;
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 (per_cpu(processor_device_array, pr->id) != NULL &&
642 per_cpu(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 per_cpu(processor_device_array, pr->id) = device;
648
649 per_cpu(processors, pr->id) = pr;
650
651 result = acpi_processor_add_fs(device);
652 if (result)
653 goto end;
654
655 sysdev = get_cpu_sysdev(pr->id);
656 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
657 return -EFAULT;
658
659 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
660 acpi_processor_notify, pr);
661
662 /* _PDC call should be done before doing anything else (if reqd.). */
663 arch_acpi_processor_init_pdc(pr);
664 acpi_processor_set_pdc(pr);
665 #ifdef CONFIG_CPU_FREQ
666 acpi_processor_ppc_has_changed(pr);
667 #endif
668 acpi_processor_get_throttling_info(pr);
669 acpi_processor_get_limit_info(pr);
670
671
672 acpi_processor_power_init(pr, device);
673
674 pr->cdev = thermal_cooling_device_register("Processor", device,
675 &processor_cooling_ops);
676 if (IS_ERR(pr->cdev)) {
677 result = PTR_ERR(pr->cdev);
678 goto end;
679 }
680
681 printk(KERN_INFO PREFIX
682 "%s is registered as cooling_device%d\n",
683 device->dev.bus_id, pr->cdev->id);
684
685 result = sysfs_create_link(&device->dev.kobj,
686 &pr->cdev->device.kobj,
687 "thermal_cooling");
688 if (result)
689 printk(KERN_ERR PREFIX "Create sysfs link\n");
690 result = sysfs_create_link(&pr->cdev->device.kobj,
691 &device->dev.kobj,
692 "device");
693 if (result)
694 printk(KERN_ERR PREFIX "Create sysfs link\n");
695
696 if (pr->flags.throttling) {
697 printk(KERN_INFO PREFIX "%s [%s] (supports",
698 acpi_device_name(device), acpi_device_bid(device));
699 printk(" %d throttling states", pr->throttling.state_count);
700 printk(")\n");
701 }
702
703 end:
704
705 return result;
706 }
707
708 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
709 {
710 struct acpi_processor *pr = data;
711 struct acpi_device *device = NULL;
712 int saved;
713
714 if (!pr)
715 return;
716
717 if (acpi_bus_get_device(pr->handle, &device))
718 return;
719
720 switch (event) {
721 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
722 saved = pr->performance_platform_limit;
723 acpi_processor_ppc_has_changed(pr);
724 if (saved == pr->performance_platform_limit)
725 break;
726 acpi_bus_generate_proc_event(device, event,
727 pr->performance_platform_limit);
728 acpi_bus_generate_netlink_event(device->pnp.device_class,
729 device->dev.bus_id, event,
730 pr->performance_platform_limit);
731 break;
732 case ACPI_PROCESSOR_NOTIFY_POWER:
733 acpi_processor_cst_has_changed(pr);
734 acpi_bus_generate_proc_event(device, event, 0);
735 acpi_bus_generate_netlink_event(device->pnp.device_class,
736 device->dev.bus_id, event, 0);
737 break;
738 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
739 acpi_processor_tstate_has_changed(pr);
740 acpi_bus_generate_proc_event(device, event, 0);
741 acpi_bus_generate_netlink_event(device->pnp.device_class,
742 device->dev.bus_id, event, 0);
743 default:
744 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
745 "Unsupported event [0x%x]\n", event));
746 break;
747 }
748
749 return;
750 }
751
752 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
753 unsigned long action, void *hcpu)
754 {
755 unsigned int cpu = (unsigned long)hcpu;
756 struct acpi_processor *pr = per_cpu(processors, cpu);
757
758 if (action == CPU_ONLINE && pr) {
759 acpi_processor_ppc_has_changed(pr);
760 acpi_processor_cst_has_changed(pr);
761 acpi_processor_tstate_has_changed(pr);
762 }
763 return NOTIFY_OK;
764 }
765
766 static struct notifier_block acpi_cpu_notifier =
767 {
768 .notifier_call = acpi_cpu_soft_notify,
769 };
770
771 static int acpi_processor_add(struct acpi_device *device)
772 {
773 struct acpi_processor *pr = NULL;
774
775
776 if (!device)
777 return -EINVAL;
778
779 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
780 if (!pr)
781 return -ENOMEM;
782
783 pr->handle = device->handle;
784 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
785 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
786 acpi_driver_data(device) = pr;
787
788 return 0;
789 }
790
791 static int acpi_processor_remove(struct acpi_device *device, int type)
792 {
793 acpi_status status = AE_OK;
794 struct acpi_processor *pr = NULL;
795
796
797 if (!device || !acpi_driver_data(device))
798 return -EINVAL;
799
800 pr = acpi_driver_data(device);
801
802 if (pr->id >= nr_cpu_ids) {
803 kfree(pr);
804 return 0;
805 }
806
807 if (type == ACPI_BUS_REMOVAL_EJECT) {
808 if (acpi_processor_handle_eject(pr))
809 return -EINVAL;
810 }
811
812 acpi_processor_power_exit(pr, device);
813
814 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
815 acpi_processor_notify);
816
817 sysfs_remove_link(&device->dev.kobj, "sysdev");
818
819 acpi_processor_remove_fs(device);
820
821 if (pr->cdev) {
822 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
823 sysfs_remove_link(&pr->cdev->device.kobj, "device");
824 thermal_cooling_device_unregister(pr->cdev);
825 pr->cdev = NULL;
826 }
827
828 per_cpu(processors, pr->id) = NULL;
829 per_cpu(processor_device_array, pr->id) = NULL;
830 kfree(pr);
831
832 return 0;
833 }
834
835 #ifdef CONFIG_ACPI_HOTPLUG_CPU
836 /****************************************************************************
837 * Acpi processor hotplug support *
838 ****************************************************************************/
839
840 static int is_processor_present(acpi_handle handle)
841 {
842 acpi_status status;
843 unsigned long sta = 0;
844
845
846 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
847
848 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
849 return 1;
850
851 /*
852 * _STA is mandatory for a processor that supports hot plug
853 */
854 if (status == AE_NOT_FOUND)
855 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
856 "Processor does not support hot plug\n"));
857 else
858 ACPI_EXCEPTION((AE_INFO, status,
859 "Processor Device is not present"));
860 return 0;
861 }
862
863 static
864 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
865 {
866 acpi_handle phandle;
867 struct acpi_device *pdev;
868 struct acpi_processor *pr;
869
870
871 if (acpi_get_parent(handle, &phandle)) {
872 return -ENODEV;
873 }
874
875 if (acpi_bus_get_device(phandle, &pdev)) {
876 return -ENODEV;
877 }
878
879 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
880 return -ENODEV;
881 }
882
883 acpi_bus_start(*device);
884
885 pr = acpi_driver_data(*device);
886 if (!pr)
887 return -ENODEV;
888
889 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
890 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
891 }
892 return 0;
893 }
894
895 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
896 u32 event, void *data)
897 {
898 struct acpi_processor *pr;
899 struct acpi_device *device = NULL;
900 int result;
901
902
903 switch (event) {
904 case ACPI_NOTIFY_BUS_CHECK:
905 case ACPI_NOTIFY_DEVICE_CHECK:
906 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
907 "Processor driver received %s event\n",
908 (event == ACPI_NOTIFY_BUS_CHECK) ?
909 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
910
911 if (!is_processor_present(handle))
912 break;
913
914 if (acpi_bus_get_device(handle, &device)) {
915 result = acpi_processor_device_add(handle, &device);
916 if (result)
917 printk(KERN_ERR PREFIX
918 "Unable to add the device\n");
919 break;
920 }
921
922 pr = acpi_driver_data(device);
923 if (!pr) {
924 printk(KERN_ERR PREFIX "Driver data is NULL\n");
925 break;
926 }
927
928 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
929 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
930 break;
931 }
932
933 result = acpi_processor_start(device);
934 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
935 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
936 } else {
937 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
938 acpi_device_bid(device));
939 }
940 break;
941 case ACPI_NOTIFY_EJECT_REQUEST:
942 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
943 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
944
945 if (acpi_bus_get_device(handle, &device)) {
946 printk(KERN_ERR PREFIX
947 "Device don't exist, dropping EJECT\n");
948 break;
949 }
950 pr = acpi_driver_data(device);
951 if (!pr) {
952 printk(KERN_ERR PREFIX
953 "Driver data is NULL, dropping EJECT\n");
954 return;
955 }
956
957 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
958 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
959 break;
960 default:
961 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
962 "Unsupported event [0x%x]\n", event));
963 break;
964 }
965
966 return;
967 }
968
969 static acpi_status
970 processor_walk_namespace_cb(acpi_handle handle,
971 u32 lvl, void *context, void **rv)
972 {
973 acpi_status status;
974 int *action = context;
975 acpi_object_type type = 0;
976
977 status = acpi_get_type(handle, &type);
978 if (ACPI_FAILURE(status))
979 return (AE_OK);
980
981 if (type != ACPI_TYPE_PROCESSOR)
982 return (AE_OK);
983
984 switch (*action) {
985 case INSTALL_NOTIFY_HANDLER:
986 acpi_install_notify_handler(handle,
987 ACPI_SYSTEM_NOTIFY,
988 acpi_processor_hotplug_notify,
989 NULL);
990 break;
991 case UNINSTALL_NOTIFY_HANDLER:
992 acpi_remove_notify_handler(handle,
993 ACPI_SYSTEM_NOTIFY,
994 acpi_processor_hotplug_notify);
995 break;
996 default:
997 break;
998 }
999
1000 return (AE_OK);
1001 }
1002
1003 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1004 {
1005
1006 if (!is_processor_present(handle)) {
1007 return AE_ERROR;
1008 }
1009
1010 if (acpi_map_lsapic(handle, p_cpu))
1011 return AE_ERROR;
1012
1013 if (arch_register_cpu(*p_cpu)) {
1014 acpi_unmap_lsapic(*p_cpu);
1015 return AE_ERROR;
1016 }
1017
1018 return AE_OK;
1019 }
1020
1021 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1022 {
1023 if (cpu_online(pr->id))
1024 cpu_down(pr->id);
1025
1026 arch_unregister_cpu(pr->id);
1027 acpi_unmap_lsapic(pr->id);
1028 return (0);
1029 }
1030 #else
1031 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1032 {
1033 return AE_ERROR;
1034 }
1035 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1036 {
1037 return (-EINVAL);
1038 }
1039 #endif
1040
1041 static
1042 void acpi_processor_install_hotplug_notify(void)
1043 {
1044 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1045 int action = INSTALL_NOTIFY_HANDLER;
1046 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1047 ACPI_ROOT_OBJECT,
1048 ACPI_UINT32_MAX,
1049 processor_walk_namespace_cb, &action, NULL);
1050 #endif
1051 register_hotcpu_notifier(&acpi_cpu_notifier);
1052 }
1053
1054 static
1055 void acpi_processor_uninstall_hotplug_notify(void)
1056 {
1057 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1058 int action = UNINSTALL_NOTIFY_HANDLER;
1059 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1060 ACPI_ROOT_OBJECT,
1061 ACPI_UINT32_MAX,
1062 processor_walk_namespace_cb, &action, NULL);
1063 #endif
1064 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1065 }
1066
1067 /*
1068 * We keep the driver loaded even when ACPI is not running.
1069 * This is needed for the powernow-k8 driver, that works even without
1070 * ACPI, but needs symbols from this driver
1071 */
1072
1073 static int __init acpi_processor_init(void)
1074 {
1075 int result = 0;
1076
1077 memset(&errata, 0, sizeof(errata));
1078
1079 #ifdef CONFIG_SMP
1080 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1081 (struct acpi_table_header **)&madt)))
1082 madt = NULL;
1083 #endif
1084
1085 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1086 if (!acpi_processor_dir)
1087 return -ENOMEM;
1088 acpi_processor_dir->owner = THIS_MODULE;
1089
1090 result = cpuidle_register_driver(&acpi_idle_driver);
1091 if (result < 0)
1092 goto out_proc;
1093
1094 result = acpi_bus_register_driver(&acpi_processor_driver);
1095 if (result < 0)
1096 goto out_cpuidle;
1097
1098 acpi_processor_install_hotplug_notify();
1099
1100 acpi_thermal_cpufreq_init();
1101
1102 acpi_processor_ppc_init();
1103
1104 acpi_processor_throttling_init();
1105
1106 return 0;
1107
1108 out_cpuidle:
1109 cpuidle_unregister_driver(&acpi_idle_driver);
1110
1111 out_proc:
1112 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1113
1114 return result;
1115 }
1116
1117 static void __exit acpi_processor_exit(void)
1118 {
1119 acpi_processor_ppc_exit();
1120
1121 acpi_thermal_cpufreq_exit();
1122
1123 acpi_processor_uninstall_hotplug_notify();
1124
1125 acpi_bus_unregister_driver(&acpi_processor_driver);
1126
1127 cpuidle_unregister_driver(&acpi_idle_driver);
1128
1129 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1130
1131 return;
1132 }
1133
1134 module_init(acpi_processor_init);
1135 module_exit(acpi_processor_exit);
1136
1137 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1138
1139 MODULE_ALIAS("processor");
Support for the Chinese Samsung S3C2440 based development boards