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ACPI: add ACPI 3.0 _TPC _TSS _PTC throttling support
[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
48 #include <asm/io.h>
49 #include <asm/system.h>
50 #include <asm/cpu.h>
51 #include <asm/delay.h>
52 #include <asm/uaccess.h>
53 #include <asm/processor.h>
54 #include <asm/smp.h>
55 #include <asm/acpi.h>
56
57 #include <acpi/acpi_bus.h>
58 #include <acpi/acpi_drivers.h>
59 #include <acpi/processor.h>
60
61 #define ACPI_PROCESSOR_COMPONENT 0x01000000
62 #define ACPI_PROCESSOR_CLASS "processor"
63 #define ACPI_PROCESSOR_DEVICE_NAME "Processor"
64 #define ACPI_PROCESSOR_FILE_INFO "info"
65 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
66 #define ACPI_PROCESSOR_FILE_LIMIT "limit"
67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
68 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81
69 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
70
71 #define ACPI_PROCESSOR_LIMIT_USER 0
72 #define ACPI_PROCESSOR_LIMIT_THERMAL 1
73
74 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
75 ACPI_MODULE_NAME("processor_core");
76
77 MODULE_AUTHOR("Paul Diefenbaugh");
78 MODULE_DESCRIPTION("ACPI Processor Driver");
79 MODULE_LICENSE("GPL");
80
81 static int acpi_processor_add(struct acpi_device *device);
82 static int acpi_processor_start(struct acpi_device *device);
83 static int acpi_processor_remove(struct acpi_device *device, int type);
84 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
85 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
86 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
87 static int acpi_processor_handle_eject(struct acpi_processor *pr);
88 extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
89
90
91 static struct acpi_driver acpi_processor_driver = {
92 .name = "processor",
93 .class = ACPI_PROCESSOR_CLASS,
94 .ids = ACPI_PROCESSOR_HID,
95 .ops = {
96 .add = acpi_processor_add,
97 .remove = acpi_processor_remove,
98 .start = acpi_processor_start,
99 },
100 };
101
102 #define INSTALL_NOTIFY_HANDLER 1
103 #define UNINSTALL_NOTIFY_HANDLER 2
104
105 static const struct file_operations acpi_processor_info_fops = {
106 .open = acpi_processor_info_open_fs,
107 .read = seq_read,
108 .llseek = seq_lseek,
109 .release = single_release,
110 };
111
112 struct acpi_processor *processors[NR_CPUS];
113 struct acpi_processor_errata errata __read_mostly;
114
115 /* --------------------------------------------------------------------------
116 Errata Handling
117 -------------------------------------------------------------------------- */
118
119 static int acpi_processor_errata_piix4(struct pci_dev *dev)
120 {
121 u8 rev = 0;
122 u8 value1 = 0;
123 u8 value2 = 0;
124
125
126 if (!dev)
127 return -EINVAL;
128
129 /*
130 * Note that 'dev' references the PIIX4 ACPI Controller.
131 */
132
133 pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
134
135 switch (rev) {
136 case 0:
137 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
138 break;
139 case 1:
140 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
141 break;
142 case 2:
143 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
144 break;
145 case 3:
146 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
147 break;
148 default:
149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
150 break;
151 }
152
153 switch (rev) {
154
155 case 0: /* PIIX4 A-step */
156 case 1: /* PIIX4 B-step */
157 /*
158 * See specification changes #13 ("Manual Throttle Duty Cycle")
159 * and #14 ("Enabling and Disabling Manual Throttle"), plus
160 * erratum #5 ("STPCLK# Deassertion Time") from the January
161 * 2002 PIIX4 specification update. Applies to only older
162 * PIIX4 models.
163 */
164 errata.piix4.throttle = 1;
165
166 case 2: /* PIIX4E */
167 case 3: /* PIIX4M */
168 /*
169 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
170 * Livelock") from the January 2002 PIIX4 specification update.
171 * Applies to all PIIX4 models.
172 */
173
174 /*
175 * BM-IDE
176 * ------
177 * Find the PIIX4 IDE Controller and get the Bus Master IDE
178 * Status register address. We'll use this later to read
179 * each IDE controller's DMA status to make sure we catch all
180 * DMA activity.
181 */
182 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
183 PCI_DEVICE_ID_INTEL_82371AB,
184 PCI_ANY_ID, PCI_ANY_ID, NULL);
185 if (dev) {
186 errata.piix4.bmisx = pci_resource_start(dev, 4);
187 pci_dev_put(dev);
188 }
189
190 /*
191 * Type-F DMA
192 * ----------
193 * Find the PIIX4 ISA Controller and read the Motherboard
194 * DMA controller's status to see if Type-F (Fast) DMA mode
195 * is enabled (bit 7) on either channel. Note that we'll
196 * disable C3 support if this is enabled, as some legacy
197 * devices won't operate well if fast DMA is disabled.
198 */
199 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
200 PCI_DEVICE_ID_INTEL_82371AB_0,
201 PCI_ANY_ID, PCI_ANY_ID, NULL);
202 if (dev) {
203 pci_read_config_byte(dev, 0x76, &value1);
204 pci_read_config_byte(dev, 0x77, &value2);
205 if ((value1 & 0x80) || (value2 & 0x80))
206 errata.piix4.fdma = 1;
207 pci_dev_put(dev);
208 }
209
210 break;
211 }
212
213 if (errata.piix4.bmisx)
214 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
215 "Bus master activity detection (BM-IDE) erratum enabled\n"));
216 if (errata.piix4.fdma)
217 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
218 "Type-F DMA livelock erratum (C3 disabled)\n"));
219
220 return 0;
221 }
222
223 static int acpi_processor_errata(struct acpi_processor *pr)
224 {
225 int result = 0;
226 struct pci_dev *dev = NULL;
227
228
229 if (!pr)
230 return -EINVAL;
231
232 /*
233 * PIIX4
234 */
235 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
236 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
237 PCI_ANY_ID, NULL);
238 if (dev) {
239 result = acpi_processor_errata_piix4(dev);
240 pci_dev_put(dev);
241 }
242
243 return result;
244 }
245
246 /* --------------------------------------------------------------------------
247 Common ACPI processor functions
248 -------------------------------------------------------------------------- */
249
250 /*
251 * _PDC is required for a BIOS-OS handshake for most of the newer
252 * ACPI processor features.
253 */
254 static int acpi_processor_set_pdc(struct acpi_processor *pr)
255 {
256 struct acpi_object_list *pdc_in = pr->pdc;
257 acpi_status status = AE_OK;
258
259
260 if (!pdc_in)
261 return status;
262
263 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
264
265 if (ACPI_FAILURE(status))
266 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
267 "Could not evaluate _PDC, using legacy perf. control...\n"));
268
269 return status;
270 }
271
272 /* --------------------------------------------------------------------------
273 FS Interface (/proc)
274 -------------------------------------------------------------------------- */
275
276 static struct proc_dir_entry *acpi_processor_dir = NULL;
277
278 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
279 {
280 struct acpi_processor *pr = seq->private;
281
282
283 if (!pr)
284 goto end;
285
286 seq_printf(seq, "processor id: %d\n"
287 "acpi id: %d\n"
288 "bus mastering control: %s\n"
289 "power management: %s\n"
290 "throttling control: %s\n"
291 "limit interface: %s\n",
292 pr->id,
293 pr->acpi_id,
294 pr->flags.bm_control ? "yes" : "no",
295 pr->flags.power ? "yes" : "no",
296 pr->flags.throttling ? "yes" : "no",
297 pr->flags.limit ? "yes" : "no");
298
299 end:
300 return 0;
301 }
302
303 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
304 {
305 return single_open(file, acpi_processor_info_seq_show,
306 PDE(inode)->data);
307 }
308
309 static int acpi_processor_add_fs(struct acpi_device *device)
310 {
311 struct proc_dir_entry *entry = NULL;
312
313
314 if (!acpi_device_dir(device)) {
315 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
316 acpi_processor_dir);
317 if (!acpi_device_dir(device))
318 return -ENODEV;
319 }
320 acpi_device_dir(device)->owner = THIS_MODULE;
321
322 /* 'info' [R] */
323 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
324 S_IRUGO, acpi_device_dir(device));
325 if (!entry)
326 return -EIO;
327 else {
328 entry->proc_fops = &acpi_processor_info_fops;
329 entry->data = acpi_driver_data(device);
330 entry->owner = THIS_MODULE;
331 }
332
333 /* 'throttling' [R/W] */
334 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
335 S_IFREG | S_IRUGO | S_IWUSR,
336 acpi_device_dir(device));
337 if (!entry)
338 return -EIO;
339 else {
340 entry->proc_fops = &acpi_processor_throttling_fops;
341 entry->data = acpi_driver_data(device);
342 entry->owner = THIS_MODULE;
343 }
344
345 /* 'limit' [R/W] */
346 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
347 S_IFREG | S_IRUGO | S_IWUSR,
348 acpi_device_dir(device));
349 if (!entry)
350 return -EIO;
351 else {
352 entry->proc_fops = &acpi_processor_limit_fops;
353 entry->data = acpi_driver_data(device);
354 entry->owner = THIS_MODULE;
355 }
356
357 return 0;
358 }
359
360 static int acpi_processor_remove_fs(struct acpi_device *device)
361 {
362
363 if (acpi_device_dir(device)) {
364 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
365 acpi_device_dir(device));
366 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
367 acpi_device_dir(device));
368 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
369 acpi_device_dir(device));
370 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
371 acpi_device_dir(device) = NULL;
372 }
373
374 return 0;
375 }
376
377 /* Use the acpiid in MADT to map cpus in case of SMP */
378
379 #ifndef CONFIG_SMP
380 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
381 #else
382
383 static struct acpi_table_madt *madt;
384
385 static int map_lapic_id(struct acpi_subtable_header *entry,
386 u32 acpi_id, int *apic_id)
387 {
388 struct acpi_madt_local_apic *lapic =
389 (struct acpi_madt_local_apic *)entry;
390 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
391 lapic->processor_id == acpi_id) {
392 *apic_id = lapic->id;
393 return 1;
394 }
395 return 0;
396 }
397
398 static int map_lsapic_id(struct acpi_subtable_header *entry,
399 u32 acpi_id, int *apic_id)
400 {
401 struct acpi_madt_local_sapic *lsapic =
402 (struct acpi_madt_local_sapic *)entry;
403 /* Only check enabled APICs*/
404 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
405 /* First check against id */
406 if (lsapic->processor_id == acpi_id) {
407 *apic_id = (lsapic->id << 8) | lsapic->eid;
408 return 1;
409 /* Check against optional uid */
410 } else if (entry->length >= 16 &&
411 lsapic->uid == acpi_id) {
412 *apic_id = lsapic->uid;
413 return 1;
414 }
415 }
416 return 0;
417 }
418
419 #ifdef CONFIG_IA64
420 #define arch_cpu_to_apicid ia64_cpu_to_sapicid
421 #else
422 #define arch_cpu_to_apicid x86_cpu_to_apicid
423 #endif
424
425 static int map_madt_entry(u32 acpi_id)
426 {
427 unsigned long madt_end, entry;
428 int apic_id = -1;
429
430 if (!madt)
431 return apic_id;
432
433 entry = (unsigned long)madt;
434 madt_end = entry + madt->header.length;
435
436 /* Parse all entries looking for a match. */
437
438 entry += sizeof(struct acpi_table_madt);
439 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
440 struct acpi_subtable_header *header =
441 (struct acpi_subtable_header *)entry;
442 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
443 if (map_lapic_id(header, acpi_id, &apic_id))
444 break;
445 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
446 if (map_lsapic_id(header, acpi_id, &apic_id))
447 break;
448 }
449 entry += header->length;
450 }
451 return apic_id;
452 }
453
454 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
455 {
456 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
457 union acpi_object *obj;
458 struct acpi_subtable_header *header;
459 int apic_id = -1;
460
461 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
462 goto exit;
463
464 if (!buffer.length || !buffer.pointer)
465 goto exit;
466
467 obj = buffer.pointer;
468 if (obj->type != ACPI_TYPE_BUFFER ||
469 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
470 goto exit;
471 }
472
473 header = (struct acpi_subtable_header *)obj->buffer.pointer;
474 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
475 map_lapic_id(header, acpi_id, &apic_id);
476 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
477 map_lsapic_id(header, acpi_id, &apic_id);
478 }
479
480 exit:
481 if (buffer.pointer)
482 kfree(buffer.pointer);
483 return apic_id;
484 }
485
486 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
487 {
488 int i;
489 int apic_id = -1;
490
491 apic_id = map_mat_entry(handle, acpi_id);
492 if (apic_id == -1)
493 apic_id = map_madt_entry(acpi_id);
494 if (apic_id == -1)
495 return apic_id;
496
497 for (i = 0; i < NR_CPUS; ++i) {
498 if (arch_cpu_to_apicid[i] == apic_id)
499 return i;
500 }
501 return -1;
502 }
503 #endif
504
505 /* --------------------------------------------------------------------------
506 Driver Interface
507 -------------------------------------------------------------------------- */
508
509 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
510 {
511 acpi_status status = 0;
512 union acpi_object object = { 0 };
513 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
514 int cpu_index;
515 static int cpu0_initialized;
516
517
518 if (!pr)
519 return -EINVAL;
520
521 if (num_online_cpus() > 1)
522 errata.smp = TRUE;
523
524 acpi_processor_errata(pr);
525
526 /*
527 * Check to see if we have bus mastering arbitration control. This
528 * is required for proper C3 usage (to maintain cache coherency).
529 */
530 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
531 pr->flags.bm_control = 1;
532 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
533 "Bus mastering arbitration control present\n"));
534 } else
535 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
536 "No bus mastering arbitration control\n"));
537
538 /* Check if it is a Device with HID and UID */
539 if (has_uid) {
540 unsigned long value;
541 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
542 NULL, &value);
543 if (ACPI_FAILURE(status)) {
544 printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
545 return -ENODEV;
546 }
547 pr->acpi_id = value;
548 } else {
549 /*
550 * Evalute the processor object. Note that it is common on SMP to
551 * have the first (boot) processor with a valid PBLK address while
552 * all others have a NULL address.
553 */
554 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
555 if (ACPI_FAILURE(status)) {
556 printk(KERN_ERR PREFIX "Evaluating processor object\n");
557 return -ENODEV;
558 }
559
560 /*
561 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
562 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
563 */
564 pr->acpi_id = object.processor.proc_id;
565 }
566 cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
567
568 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
569 if (!cpu0_initialized && (cpu_index == -1) &&
570 (num_online_cpus() == 1)) {
571 cpu_index = 0;
572 }
573
574 cpu0_initialized = 1;
575
576 pr->id = cpu_index;
577
578 /*
579 * Extra Processor objects may be enumerated on MP systems with
580 * less than the max # of CPUs. They should be ignored _iff
581 * they are physically not present.
582 */
583 if (pr->id == -1) {
584 if (ACPI_FAILURE
585 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
586 return -ENODEV;
587 }
588 }
589
590 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
591 pr->acpi_id));
592
593 if (!object.processor.pblk_address)
594 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
595 else if (object.processor.pblk_length != 6)
596 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
597 object.processor.pblk_length);
598 else {
599 pr->throttling.address = object.processor.pblk_address;
600 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
601 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
602
603 pr->pblk = object.processor.pblk_address;
604
605 /*
606 * We don't care about error returns - we just try to mark
607 * these reserved so that nobody else is confused into thinking
608 * that this region might be unused..
609 *
610 * (In particular, allocating the IO range for Cardbus)
611 */
612 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
613 }
614
615 #ifdef CONFIG_CPU_FREQ
616 acpi_processor_ppc_has_changed(pr);
617 #endif
618 acpi_processor_get_throttling_info(pr);
619 acpi_processor_get_limit_info(pr);
620
621 return 0;
622 }
623
624 static void *processor_device_array[NR_CPUS];
625
626 static int __cpuinit acpi_processor_start(struct acpi_device *device)
627 {
628 int result = 0;
629 acpi_status status = AE_OK;
630 struct acpi_processor *pr;
631
632
633 pr = acpi_driver_data(device);
634
635 result = acpi_processor_get_info(pr, device->flags.unique_id);
636 if (result) {
637 /* Processor is physically not present */
638 return 0;
639 }
640
641 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
642
643 /*
644 * Buggy BIOS check
645 * ACPI id of processors can be reported wrongly by the BIOS.
646 * Don't trust it blindly
647 */
648 if (processor_device_array[pr->id] != NULL &&
649 processor_device_array[pr->id] != device) {
650 printk(KERN_WARNING "BIOS reported wrong ACPI id"
651 "for the processor\n");
652 return -ENODEV;
653 }
654 processor_device_array[pr->id] = device;
655
656 processors[pr->id] = pr;
657
658 result = acpi_processor_add_fs(device);
659 if (result)
660 goto end;
661
662 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
663 acpi_processor_notify, pr);
664
665 /* _PDC call should be done before doing anything else (if reqd.). */
666 arch_acpi_processor_init_pdc(pr);
667 acpi_processor_set_pdc(pr);
668
669 acpi_processor_power_init(pr, device);
670
671 if (pr->flags.throttling) {
672 printk(KERN_INFO PREFIX "%s [%s] (supports",
673 acpi_device_name(device), acpi_device_bid(device));
674 printk(" %d throttling states", pr->throttling.state_count);
675 printk(")\n");
676 }
677
678 end:
679
680 return result;
681 }
682
683 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
684 {
685 struct acpi_processor *pr = data;
686 struct acpi_device *device = NULL;
687
688
689 if (!pr)
690 return;
691
692 if (acpi_bus_get_device(pr->handle, &device))
693 return;
694
695 switch (event) {
696 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
697 acpi_processor_ppc_has_changed(pr);
698 acpi_bus_generate_event(device, event,
699 pr->performance_platform_limit);
700 break;
701 case ACPI_PROCESSOR_NOTIFY_POWER:
702 acpi_processor_cst_has_changed(pr);
703 acpi_bus_generate_event(device, event, 0);
704 break;
705 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
706 acpi_processor_tstate_has_changed(pr);
707 acpi_bus_generate_event(device, event, 0);
708 default:
709 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
710 "Unsupported event [0x%x]\n", event));
711 break;
712 }
713
714 return;
715 }
716
717 static int acpi_processor_add(struct acpi_device *device)
718 {
719 struct acpi_processor *pr = NULL;
720
721
722 if (!device)
723 return -EINVAL;
724
725 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
726 if (!pr)
727 return -ENOMEM;
728
729 pr->handle = device->handle;
730 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
731 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
732 acpi_driver_data(device) = pr;
733
734 return 0;
735 }
736
737 static int acpi_processor_remove(struct acpi_device *device, int type)
738 {
739 acpi_status status = AE_OK;
740 struct acpi_processor *pr = NULL;
741
742
743 if (!device || !acpi_driver_data(device))
744 return -EINVAL;
745
746 pr = acpi_driver_data(device);
747
748 if (pr->id >= NR_CPUS) {
749 kfree(pr);
750 return 0;
751 }
752
753 if (type == ACPI_BUS_REMOVAL_EJECT) {
754 if (acpi_processor_handle_eject(pr))
755 return -EINVAL;
756 }
757
758 acpi_processor_power_exit(pr, device);
759
760 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
761 acpi_processor_notify);
762
763 acpi_processor_remove_fs(device);
764
765 processors[pr->id] = NULL;
766
767 kfree(pr);
768
769 return 0;
770 }
771
772 #ifdef CONFIG_ACPI_HOTPLUG_CPU
773 /****************************************************************************
774 * Acpi processor hotplug support *
775 ****************************************************************************/
776
777 static int is_processor_present(acpi_handle handle);
778
779 static int is_processor_present(acpi_handle handle)
780 {
781 acpi_status status;
782 unsigned long sta = 0;
783
784
785 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
786 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
787 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
788 return 0;
789 }
790 return 1;
791 }
792
793 static
794 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
795 {
796 acpi_handle phandle;
797 struct acpi_device *pdev;
798 struct acpi_processor *pr;
799
800
801 if (acpi_get_parent(handle, &phandle)) {
802 return -ENODEV;
803 }
804
805 if (acpi_bus_get_device(phandle, &pdev)) {
806 return -ENODEV;
807 }
808
809 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
810 return -ENODEV;
811 }
812
813 acpi_bus_start(*device);
814
815 pr = acpi_driver_data(*device);
816 if (!pr)
817 return -ENODEV;
818
819 if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
820 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
821 }
822 return 0;
823 }
824
825 static void
826 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
827 {
828 struct acpi_processor *pr;
829 struct acpi_device *device = NULL;
830 int result;
831
832
833 switch (event) {
834 case ACPI_NOTIFY_BUS_CHECK:
835 case ACPI_NOTIFY_DEVICE_CHECK:
836 printk("Processor driver received %s event\n",
837 (event == ACPI_NOTIFY_BUS_CHECK) ?
838 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
839
840 if (!is_processor_present(handle))
841 break;
842
843 if (acpi_bus_get_device(handle, &device)) {
844 result = acpi_processor_device_add(handle, &device);
845 if (result)
846 printk(KERN_ERR PREFIX
847 "Unable to add the device\n");
848 break;
849 }
850
851 pr = acpi_driver_data(device);
852 if (!pr) {
853 printk(KERN_ERR PREFIX "Driver data is NULL\n");
854 break;
855 }
856
857 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
858 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
859 break;
860 }
861
862 result = acpi_processor_start(device);
863 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
864 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
865 } else {
866 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
867 acpi_device_bid(device));
868 }
869 break;
870 case ACPI_NOTIFY_EJECT_REQUEST:
871 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
872 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
873
874 if (acpi_bus_get_device(handle, &device)) {
875 printk(KERN_ERR PREFIX
876 "Device don't exist, dropping EJECT\n");
877 break;
878 }
879 pr = acpi_driver_data(device);
880 if (!pr) {
881 printk(KERN_ERR PREFIX
882 "Driver data is NULL, dropping EJECT\n");
883 return;
884 }
885
886 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
887 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
888 break;
889 default:
890 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
891 "Unsupported event [0x%x]\n", event));
892 break;
893 }
894
895 return;
896 }
897
898 static acpi_status
899 processor_walk_namespace_cb(acpi_handle handle,
900 u32 lvl, void *context, void **rv)
901 {
902 acpi_status status;
903 int *action = context;
904 acpi_object_type type = 0;
905
906 status = acpi_get_type(handle, &type);
907 if (ACPI_FAILURE(status))
908 return (AE_OK);
909
910 if (type != ACPI_TYPE_PROCESSOR)
911 return (AE_OK);
912
913 switch (*action) {
914 case INSTALL_NOTIFY_HANDLER:
915 acpi_install_notify_handler(handle,
916 ACPI_SYSTEM_NOTIFY,
917 acpi_processor_hotplug_notify,
918 NULL);
919 break;
920 case UNINSTALL_NOTIFY_HANDLER:
921 acpi_remove_notify_handler(handle,
922 ACPI_SYSTEM_NOTIFY,
923 acpi_processor_hotplug_notify);
924 break;
925 default:
926 break;
927 }
928
929 return (AE_OK);
930 }
931
932 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
933 {
934
935 if (!is_processor_present(handle)) {
936 return AE_ERROR;
937 }
938
939 if (acpi_map_lsapic(handle, p_cpu))
940 return AE_ERROR;
941
942 if (arch_register_cpu(*p_cpu)) {
943 acpi_unmap_lsapic(*p_cpu);
944 return AE_ERROR;
945 }
946
947 return AE_OK;
948 }
949
950 static int acpi_processor_handle_eject(struct acpi_processor *pr)
951 {
952 if (cpu_online(pr->id)) {
953 return (-EINVAL);
954 }
955 arch_unregister_cpu(pr->id);
956 acpi_unmap_lsapic(pr->id);
957 return (0);
958 }
959 #else
960 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
961 {
962 return AE_ERROR;
963 }
964 static int acpi_processor_handle_eject(struct acpi_processor *pr)
965 {
966 return (-EINVAL);
967 }
968 #endif
969
970 static
971 void acpi_processor_install_hotplug_notify(void)
972 {
973 #ifdef CONFIG_ACPI_HOTPLUG_CPU
974 int action = INSTALL_NOTIFY_HANDLER;
975 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
976 ACPI_ROOT_OBJECT,
977 ACPI_UINT32_MAX,
978 processor_walk_namespace_cb, &action, NULL);
979 #endif
980 }
981
982 static
983 void acpi_processor_uninstall_hotplug_notify(void)
984 {
985 #ifdef CONFIG_ACPI_HOTPLUG_CPU
986 int action = UNINSTALL_NOTIFY_HANDLER;
987 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
988 ACPI_ROOT_OBJECT,
989 ACPI_UINT32_MAX,
990 processor_walk_namespace_cb, &action, NULL);
991 #endif
992 }
993
994 /*
995 * We keep the driver loaded even when ACPI is not running.
996 * This is needed for the powernow-k8 driver, that works even without
997 * ACPI, but needs symbols from this driver
998 */
999
1000 static int __init acpi_processor_init(void)
1001 {
1002 int result = 0;
1003
1004
1005 memset(&processors, 0, sizeof(processors));
1006 memset(&errata, 0, sizeof(errata));
1007
1008 #ifdef CONFIG_SMP
1009 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1010 (struct acpi_table_header **)&madt)))
1011 madt = NULL;
1012 #endif
1013
1014 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1015 if (!acpi_processor_dir)
1016 return -ENOMEM;
1017 acpi_processor_dir->owner = THIS_MODULE;
1018
1019 result = acpi_bus_register_driver(&acpi_processor_driver);
1020 if (result < 0) {
1021 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1022 return result;
1023 }
1024
1025 acpi_processor_install_hotplug_notify();
1026
1027 acpi_thermal_cpufreq_init();
1028
1029 acpi_processor_ppc_init();
1030
1031 return 0;
1032 }
1033
1034 static void __exit acpi_processor_exit(void)
1035 {
1036
1037 acpi_processor_ppc_exit();
1038
1039 acpi_thermal_cpufreq_exit();
1040
1041 acpi_processor_uninstall_hotplug_notify();
1042
1043 acpi_bus_unregister_driver(&acpi_processor_driver);
1044
1045 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1046
1047 return;
1048 }
1049
1050 module_init(acpi_processor_init);
1051 module_exit(acpi_processor_exit);
1052
1053 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1054
1055 MODULE_ALIAS("processor");
Linux kernel - Deliverables
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