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ACPI : Create "idle=nomwait" bootparam
[deliverable/linux.git] / drivers / acpi / processor_core.c
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 if (idle_nomwait) {
269 /*
270 * If mwait is disabled for CPU C-states, the C2C3_FFH access
271 * mode will be disabled in the parameter of _PDC object.
272 * Of course C1_FFH access mode will also be disabled.
273 */
274 union acpi_object *obj;
275 u32 *buffer = NULL;
276
277 obj = pdc_in->pointer;
278 buffer = (u32 *)(obj->buffer.pointer);
279 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
280
281 }
282 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
283
284 if (ACPI_FAILURE(status))
285 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
286 "Could not evaluate _PDC, using legacy perf. control...\n"));
287
288 return status;
289 }
290
291 /* --------------------------------------------------------------------------
292 FS Interface (/proc)
293 -------------------------------------------------------------------------- */
294
295 static struct proc_dir_entry *acpi_processor_dir = NULL;
296
297 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
298 {
299 struct acpi_processor *pr = seq->private;
300
301
302 if (!pr)
303 goto end;
304
305 seq_printf(seq, "processor id: %d\n"
306 "acpi id: %d\n"
307 "bus mastering control: %s\n"
308 "power management: %s\n"
309 "throttling control: %s\n"
310 "limit interface: %s\n",
311 pr->id,
312 pr->acpi_id,
313 pr->flags.bm_control ? "yes" : "no",
314 pr->flags.power ? "yes" : "no",
315 pr->flags.throttling ? "yes" : "no",
316 pr->flags.limit ? "yes" : "no");
317
318 end:
319 return 0;
320 }
321
322 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
323 {
324 return single_open(file, acpi_processor_info_seq_show,
325 PDE(inode)->data);
326 }
327
328 static int acpi_processor_add_fs(struct acpi_device *device)
329 {
330 struct proc_dir_entry *entry = NULL;
331
332
333 if (!acpi_device_dir(device)) {
334 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
335 acpi_processor_dir);
336 if (!acpi_device_dir(device))
337 return -ENODEV;
338 }
339 acpi_device_dir(device)->owner = THIS_MODULE;
340
341 /* 'info' [R] */
342 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
343 S_IRUGO, acpi_device_dir(device),
344 &acpi_processor_info_fops,
345 acpi_driver_data(device));
346 if (!entry)
347 return -EIO;
348
349 /* 'throttling' [R/W] */
350 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
351 S_IFREG | S_IRUGO | S_IWUSR,
352 acpi_device_dir(device),
353 &acpi_processor_throttling_fops,
354 acpi_driver_data(device));
355 if (!entry)
356 return -EIO;
357
358 /* 'limit' [R/W] */
359 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
360 S_IFREG | S_IRUGO | S_IWUSR,
361 acpi_device_dir(device),
362 &acpi_processor_limit_fops,
363 acpi_driver_data(device));
364 if (!entry)
365 return -EIO;
366 return 0;
367 }
368
369 static int acpi_processor_remove_fs(struct acpi_device *device)
370 {
371
372 if (acpi_device_dir(device)) {
373 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
374 acpi_device_dir(device));
375 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
376 acpi_device_dir(device));
377 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
378 acpi_device_dir(device));
379 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
380 acpi_device_dir(device) = NULL;
381 }
382
383 return 0;
384 }
385
386 /* Use the acpiid in MADT to map cpus in case of SMP */
387
388 #ifndef CONFIG_SMP
389 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
390 #else
391
392 static struct acpi_table_madt *madt;
393
394 static int map_lapic_id(struct acpi_subtable_header *entry,
395 u32 acpi_id, int *apic_id)
396 {
397 struct acpi_madt_local_apic *lapic =
398 (struct acpi_madt_local_apic *)entry;
399 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
400 lapic->processor_id == acpi_id) {
401 *apic_id = lapic->id;
402 return 1;
403 }
404 return 0;
405 }
406
407 static int map_lsapic_id(struct acpi_subtable_header *entry,
408 u32 acpi_id, int *apic_id)
409 {
410 struct acpi_madt_local_sapic *lsapic =
411 (struct acpi_madt_local_sapic *)entry;
412 /* Only check enabled APICs*/
413 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
414 /* First check against id */
415 if (lsapic->processor_id == acpi_id) {
416 *apic_id = (lsapic->id << 8) | lsapic->eid;
417 return 1;
418 /* Check against optional uid */
419 } else if (entry->length >= 16 &&
420 lsapic->uid == acpi_id) {
421 *apic_id = lsapic->uid;
422 return 1;
423 }
424 }
425 return 0;
426 }
427
428 static int map_madt_entry(u32 acpi_id)
429 {
430 unsigned long madt_end, entry;
431 int apic_id = -1;
432
433 if (!madt)
434 return apic_id;
435
436 entry = (unsigned long)madt;
437 madt_end = entry + madt->header.length;
438
439 /* Parse all entries looking for a match. */
440
441 entry += sizeof(struct acpi_table_madt);
442 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
443 struct acpi_subtable_header *header =
444 (struct acpi_subtable_header *)entry;
445 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
446 if (map_lapic_id(header, acpi_id, &apic_id))
447 break;
448 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
449 if (map_lsapic_id(header, acpi_id, &apic_id))
450 break;
451 }
452 entry += header->length;
453 }
454 return apic_id;
455 }
456
457 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
458 {
459 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
460 union acpi_object *obj;
461 struct acpi_subtable_header *header;
462 int apic_id = -1;
463
464 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
465 goto exit;
466
467 if (!buffer.length || !buffer.pointer)
468 goto exit;
469
470 obj = buffer.pointer;
471 if (obj->type != ACPI_TYPE_BUFFER ||
472 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
473 goto exit;
474 }
475
476 header = (struct acpi_subtable_header *)obj->buffer.pointer;
477 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
478 map_lapic_id(header, acpi_id, &apic_id);
479 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
480 map_lsapic_id(header, acpi_id, &apic_id);
481 }
482
483 exit:
484 if (buffer.pointer)
485 kfree(buffer.pointer);
486 return apic_id;
487 }
488
489 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
490 {
491 int i;
492 int apic_id = -1;
493
494 apic_id = map_mat_entry(handle, acpi_id);
495 if (apic_id == -1)
496 apic_id = map_madt_entry(acpi_id);
497 if (apic_id == -1)
498 return apic_id;
499
500 for_each_possible_cpu(i) {
501 if (cpu_physical_id(i) == apic_id)
502 return i;
503 }
504 return -1;
505 }
506 #endif
507
508 /* --------------------------------------------------------------------------
509 Driver Interface
510 -------------------------------------------------------------------------- */
511
512 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
513 {
514 acpi_status status = 0;
515 union acpi_object object = { 0 };
516 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
517 int cpu_index;
518 static int cpu0_initialized;
519
520
521 if (!pr)
522 return -EINVAL;
523
524 if (num_online_cpus() > 1)
525 errata.smp = TRUE;
526
527 acpi_processor_errata(pr);
528
529 /*
530 * Check to see if we have bus mastering arbitration control. This
531 * is required for proper C3 usage (to maintain cache coherency).
532 */
533 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
534 pr->flags.bm_control = 1;
535 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
536 "Bus mastering arbitration control present\n"));
537 } else
538 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
539 "No bus mastering arbitration control\n"));
540
541 /* Check if it is a Device with HID and UID */
542 if (has_uid) {
543 unsigned long value;
544 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
545 NULL, &value);
546 if (ACPI_FAILURE(status)) {
547 printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
548 return -ENODEV;
549 }
550 pr->acpi_id = value;
551 } else {
552 /*
553 * Evalute the processor object. Note that it is common on SMP to
554 * have the first (boot) processor with a valid PBLK address while
555 * all others have a NULL address.
556 */
557 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
558 if (ACPI_FAILURE(status)) {
559 printk(KERN_ERR PREFIX "Evaluating processor object\n");
560 return -ENODEV;
561 }
562
563 /*
564 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
565 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
566 */
567 pr->acpi_id = object.processor.proc_id;
568 }
569 cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
570
571 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
572 if (!cpu0_initialized && (cpu_index == -1) &&
573 (num_online_cpus() == 1)) {
574 cpu_index = 0;
575 }
576
577 cpu0_initialized = 1;
578
579 pr->id = cpu_index;
580
581 /*
582 * Extra Processor objects may be enumerated on MP systems with
583 * less than the max # of CPUs. They should be ignored _iff
584 * they are physically not present.
585 */
586 if (pr->id == -1) {
587 if (ACPI_FAILURE
588 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
589 return -ENODEV;
590 }
591 }
592
593 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
594 pr->acpi_id));
595
596 if (!object.processor.pblk_address)
597 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
598 else if (object.processor.pblk_length != 6)
599 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
600 object.processor.pblk_length);
601 else {
602 pr->throttling.address = object.processor.pblk_address;
603 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
604 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
605
606 pr->pblk = object.processor.pblk_address;
607
608 /*
609 * We don't care about error returns - we just try to mark
610 * these reserved so that nobody else is confused into thinking
611 * that this region might be unused..
612 *
613 * (In particular, allocating the IO range for Cardbus)
614 */
615 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
616 }
617
618 /*
619 * If ACPI describes a slot number for this CPU, we can use it
620 * ensure we get the right value in the "physical id" field
621 * of /proc/cpuinfo
622 */
623 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
624 if (ACPI_SUCCESS(status))
625 arch_fix_phys_package_id(pr->id, object.integer.value);
626
627 return 0;
628 }
629
630 static DEFINE_PER_CPU(void *, processor_device_array);
631
632 static int __cpuinit acpi_processor_start(struct acpi_device *device)
633 {
634 int result = 0;
635 acpi_status status = AE_OK;
636 struct acpi_processor *pr;
637 struct sys_device *sysdev;
638
639 pr = acpi_driver_data(device);
640
641 result = acpi_processor_get_info(pr, device->flags.unique_id);
642 if (result) {
643 /* Processor is physically not present */
644 return 0;
645 }
646
647 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
648
649 /*
650 * Buggy BIOS check
651 * ACPI id of processors can be reported wrongly by the BIOS.
652 * Don't trust it blindly
653 */
654 if (per_cpu(processor_device_array, pr->id) != NULL &&
655 per_cpu(processor_device_array, pr->id) != device) {
656 printk(KERN_WARNING "BIOS reported wrong ACPI id "
657 "for the processor\n");
658 return -ENODEV;
659 }
660 per_cpu(processor_device_array, pr->id) = device;
661
662 per_cpu(processors, pr->id) = pr;
663
664 result = acpi_processor_add_fs(device);
665 if (result)
666 goto end;
667
668 sysdev = get_cpu_sysdev(pr->id);
669 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
670 return -EFAULT;
671
672 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
673 acpi_processor_notify, pr);
674
675 /* _PDC call should be done before doing anything else (if reqd.). */
676 arch_acpi_processor_init_pdc(pr);
677 acpi_processor_set_pdc(pr);
678 #ifdef CONFIG_CPU_FREQ
679 acpi_processor_ppc_has_changed(pr);
680 #endif
681 acpi_processor_get_throttling_info(pr);
682 acpi_processor_get_limit_info(pr);
683
684
685 acpi_processor_power_init(pr, device);
686
687 pr->cdev = thermal_cooling_device_register("Processor", device,
688 &processor_cooling_ops);
689 if (IS_ERR(pr->cdev)) {
690 result = PTR_ERR(pr->cdev);
691 goto end;
692 }
693
694 printk(KERN_INFO PREFIX
695 "%s is registered as cooling_device%d\n",
696 device->dev.bus_id, pr->cdev->id);
697
698 result = sysfs_create_link(&device->dev.kobj,
699 &pr->cdev->device.kobj,
700 "thermal_cooling");
701 if (result)
702 printk(KERN_ERR PREFIX "Create sysfs link\n");
703 result = sysfs_create_link(&pr->cdev->device.kobj,
704 &device->dev.kobj,
705 "device");
706 if (result)
707 printk(KERN_ERR PREFIX "Create sysfs link\n");
708
709 if (pr->flags.throttling) {
710 printk(KERN_INFO PREFIX "%s [%s] (supports",
711 acpi_device_name(device), acpi_device_bid(device));
712 printk(" %d throttling states", pr->throttling.state_count);
713 printk(")\n");
714 }
715
716 end:
717
718 return result;
719 }
720
721 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
722 {
723 struct acpi_processor *pr = data;
724 struct acpi_device *device = NULL;
725 int saved;
726
727 if (!pr)
728 return;
729
730 if (acpi_bus_get_device(pr->handle, &device))
731 return;
732
733 switch (event) {
734 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
735 saved = pr->performance_platform_limit;
736 acpi_processor_ppc_has_changed(pr);
737 if (saved == pr->performance_platform_limit)
738 break;
739 acpi_bus_generate_proc_event(device, event,
740 pr->performance_platform_limit);
741 acpi_bus_generate_netlink_event(device->pnp.device_class,
742 device->dev.bus_id, event,
743 pr->performance_platform_limit);
744 break;
745 case ACPI_PROCESSOR_NOTIFY_POWER:
746 acpi_processor_cst_has_changed(pr);
747 acpi_bus_generate_proc_event(device, event, 0);
748 acpi_bus_generate_netlink_event(device->pnp.device_class,
749 device->dev.bus_id, event, 0);
750 break;
751 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
752 acpi_processor_tstate_has_changed(pr);
753 acpi_bus_generate_proc_event(device, event, 0);
754 acpi_bus_generate_netlink_event(device->pnp.device_class,
755 device->dev.bus_id, event, 0);
756 default:
757 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
758 "Unsupported event [0x%x]\n", event));
759 break;
760 }
761
762 return;
763 }
764
765 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
766 unsigned long action, void *hcpu)
767 {
768 unsigned int cpu = (unsigned long)hcpu;
769 struct acpi_processor *pr = per_cpu(processors, cpu);
770
771 if (action == CPU_ONLINE && pr) {
772 acpi_processor_ppc_has_changed(pr);
773 acpi_processor_cst_has_changed(pr);
774 acpi_processor_tstate_has_changed(pr);
775 }
776 return NOTIFY_OK;
777 }
778
779 static struct notifier_block acpi_cpu_notifier =
780 {
781 .notifier_call = acpi_cpu_soft_notify,
782 };
783
784 static int acpi_processor_add(struct acpi_device *device)
785 {
786 struct acpi_processor *pr = NULL;
787
788
789 if (!device)
790 return -EINVAL;
791
792 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
793 if (!pr)
794 return -ENOMEM;
795
796 pr->handle = device->handle;
797 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
798 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
799 acpi_driver_data(device) = pr;
800
801 return 0;
802 }
803
804 static int acpi_processor_remove(struct acpi_device *device, int type)
805 {
806 acpi_status status = AE_OK;
807 struct acpi_processor *pr = NULL;
808
809
810 if (!device || !acpi_driver_data(device))
811 return -EINVAL;
812
813 pr = acpi_driver_data(device);
814
815 if (pr->id >= nr_cpu_ids) {
816 kfree(pr);
817 return 0;
818 }
819
820 if (type == ACPI_BUS_REMOVAL_EJECT) {
821 if (acpi_processor_handle_eject(pr))
822 return -EINVAL;
823 }
824
825 acpi_processor_power_exit(pr, device);
826
827 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
828 acpi_processor_notify);
829
830 sysfs_remove_link(&device->dev.kobj, "sysdev");
831
832 acpi_processor_remove_fs(device);
833
834 if (pr->cdev) {
835 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
836 sysfs_remove_link(&pr->cdev->device.kobj, "device");
837 thermal_cooling_device_unregister(pr->cdev);
838 pr->cdev = NULL;
839 }
840
841 per_cpu(processors, pr->id) = NULL;
842 per_cpu(processor_device_array, pr->id) = NULL;
843 kfree(pr);
844
845 return 0;
846 }
847
848 #ifdef CONFIG_ACPI_HOTPLUG_CPU
849 /****************************************************************************
850 * Acpi processor hotplug support *
851 ****************************************************************************/
852
853 static int is_processor_present(acpi_handle handle)
854 {
855 acpi_status status;
856 unsigned long sta = 0;
857
858
859 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
860
861 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
862 return 1;
863
864 /*
865 * _STA is mandatory for a processor that supports hot plug
866 */
867 if (status == AE_NOT_FOUND)
868 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
869 "Processor does not support hot plug\n"));
870 else
871 ACPI_EXCEPTION((AE_INFO, status,
872 "Processor Device is not present"));
873 return 0;
874 }
875
876 static
877 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
878 {
879 acpi_handle phandle;
880 struct acpi_device *pdev;
881 struct acpi_processor *pr;
882
883
884 if (acpi_get_parent(handle, &phandle)) {
885 return -ENODEV;
886 }
887
888 if (acpi_bus_get_device(phandle, &pdev)) {
889 return -ENODEV;
890 }
891
892 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
893 return -ENODEV;
894 }
895
896 acpi_bus_start(*device);
897
898 pr = acpi_driver_data(*device);
899 if (!pr)
900 return -ENODEV;
901
902 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
903 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
904 }
905 return 0;
906 }
907
908 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
909 u32 event, void *data)
910 {
911 struct acpi_processor *pr;
912 struct acpi_device *device = NULL;
913 int result;
914
915
916 switch (event) {
917 case ACPI_NOTIFY_BUS_CHECK:
918 case ACPI_NOTIFY_DEVICE_CHECK:
919 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
920 "Processor driver received %s event\n",
921 (event == ACPI_NOTIFY_BUS_CHECK) ?
922 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
923
924 if (!is_processor_present(handle))
925 break;
926
927 if (acpi_bus_get_device(handle, &device)) {
928 result = acpi_processor_device_add(handle, &device);
929 if (result)
930 printk(KERN_ERR PREFIX
931 "Unable to add the device\n");
932 break;
933 }
934
935 pr = acpi_driver_data(device);
936 if (!pr) {
937 printk(KERN_ERR PREFIX "Driver data is NULL\n");
938 break;
939 }
940
941 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
942 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
943 break;
944 }
945
946 result = acpi_processor_start(device);
947 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
948 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
949 } else {
950 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
951 acpi_device_bid(device));
952 }
953 break;
954 case ACPI_NOTIFY_EJECT_REQUEST:
955 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
956 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
957
958 if (acpi_bus_get_device(handle, &device)) {
959 printk(KERN_ERR PREFIX
960 "Device don't exist, dropping EJECT\n");
961 break;
962 }
963 pr = acpi_driver_data(device);
964 if (!pr) {
965 printk(KERN_ERR PREFIX
966 "Driver data is NULL, dropping EJECT\n");
967 return;
968 }
969
970 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
971 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
972 break;
973 default:
974 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
975 "Unsupported event [0x%x]\n", event));
976 break;
977 }
978
979 return;
980 }
981
982 static acpi_status
983 processor_walk_namespace_cb(acpi_handle handle,
984 u32 lvl, void *context, void **rv)
985 {
986 acpi_status status;
987 int *action = context;
988 acpi_object_type type = 0;
989
990 status = acpi_get_type(handle, &type);
991 if (ACPI_FAILURE(status))
992 return (AE_OK);
993
994 if (type != ACPI_TYPE_PROCESSOR)
995 return (AE_OK);
996
997 switch (*action) {
998 case INSTALL_NOTIFY_HANDLER:
999 acpi_install_notify_handler(handle,
1000 ACPI_SYSTEM_NOTIFY,
1001 acpi_processor_hotplug_notify,
1002 NULL);
1003 break;
1004 case UNINSTALL_NOTIFY_HANDLER:
1005 acpi_remove_notify_handler(handle,
1006 ACPI_SYSTEM_NOTIFY,
1007 acpi_processor_hotplug_notify);
1008 break;
1009 default:
1010 break;
1011 }
1012
1013 return (AE_OK);
1014 }
1015
1016 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1017 {
1018
1019 if (!is_processor_present(handle)) {
1020 return AE_ERROR;
1021 }
1022
1023 if (acpi_map_lsapic(handle, p_cpu))
1024 return AE_ERROR;
1025
1026 if (arch_register_cpu(*p_cpu)) {
1027 acpi_unmap_lsapic(*p_cpu);
1028 return AE_ERROR;
1029 }
1030
1031 return AE_OK;
1032 }
1033
1034 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1035 {
1036 if (cpu_online(pr->id))
1037 cpu_down(pr->id);
1038
1039 arch_unregister_cpu(pr->id);
1040 acpi_unmap_lsapic(pr->id);
1041 return (0);
1042 }
1043 #else
1044 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1045 {
1046 return AE_ERROR;
1047 }
1048 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1049 {
1050 return (-EINVAL);
1051 }
1052 #endif
1053
1054 static
1055 void acpi_processor_install_hotplug_notify(void)
1056 {
1057 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1058 int action = INSTALL_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 register_hotcpu_notifier(&acpi_cpu_notifier);
1065 }
1066
1067 static
1068 void acpi_processor_uninstall_hotplug_notify(void)
1069 {
1070 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1071 int action = UNINSTALL_NOTIFY_HANDLER;
1072 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1073 ACPI_ROOT_OBJECT,
1074 ACPI_UINT32_MAX,
1075 processor_walk_namespace_cb, &action, NULL);
1076 #endif
1077 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1078 }
1079
1080 /*
1081 * We keep the driver loaded even when ACPI is not running.
1082 * This is needed for the powernow-k8 driver, that works even without
1083 * ACPI, but needs symbols from this driver
1084 */
1085
1086 static int __init acpi_processor_init(void)
1087 {
1088 int result = 0;
1089
1090 memset(&errata, 0, sizeof(errata));
1091
1092 #ifdef CONFIG_SMP
1093 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1094 (struct acpi_table_header **)&madt)))
1095 madt = NULL;
1096 #endif
1097
1098 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1099 if (!acpi_processor_dir)
1100 return -ENOMEM;
1101 acpi_processor_dir->owner = THIS_MODULE;
1102
1103 result = cpuidle_register_driver(&acpi_idle_driver);
1104 if (result < 0)
1105 goto out_proc;
1106
1107 result = acpi_bus_register_driver(&acpi_processor_driver);
1108 if (result < 0)
1109 goto out_cpuidle;
1110
1111 acpi_processor_install_hotplug_notify();
1112
1113 acpi_thermal_cpufreq_init();
1114
1115 acpi_processor_ppc_init();
1116
1117 acpi_processor_throttling_init();
1118
1119 return 0;
1120
1121 out_cpuidle:
1122 cpuidle_unregister_driver(&acpi_idle_driver);
1123
1124 out_proc:
1125 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1126
1127 return result;
1128 }
1129
1130 static void __exit acpi_processor_exit(void)
1131 {
1132 acpi_processor_ppc_exit();
1133
1134 acpi_thermal_cpufreq_exit();
1135
1136 acpi_processor_uninstall_hotplug_notify();
1137
1138 acpi_bus_unregister_driver(&acpi_processor_driver);
1139
1140 cpuidle_unregister_driver(&acpi_idle_driver);
1141
1142 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1143
1144 return;
1145 }
1146
1147 module_init(acpi_processor_init);
1148 module_exit(acpi_processor_exit);
1149
1150 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1151
1152 MODULE_ALIAS("processor");
Linux kernel - Deliverables
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