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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / processor_core.c
blobf4778747e889bd6dae32f77287b3580a042081b1
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
62 #define ACPI_PROCESSOR_COMPONENT 0x01000000
63 #define ACPI_PROCESSOR_CLASS "processor"
64 #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
65 #define ACPI_PROCESSOR_DEVICE_NAME "Processor"
66 #define ACPI_PROCESSOR_FILE_INFO "info"
67 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
68 #define ACPI_PROCESSOR_FILE_LIMIT "limit"
69 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
70 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81
71
72 #define ACPI_PROCESSOR_LIMIT_USER 0
73 #define ACPI_PROCESSOR_LIMIT_THERMAL 1
74
75 #define ACPI_STA_PRESENT 0x00000001
76
77 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
78 ACPI_MODULE_NAME ("acpi_processor")
79
80 MODULE_AUTHOR("Paul Diefenbaugh");
81 MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
82 MODULE_LICENSE("GPL");
83
84
85 static int acpi_processor_add (struct acpi_device *device);
86 static int acpi_processor_start (struct acpi_device *device);
87 static int acpi_processor_remove (struct acpi_device *device, int type);
88 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
89 static void acpi_processor_notify ( acpi_handle handle, u32 event, void *data);
90 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
91 static int acpi_processor_handle_eject(struct acpi_processor *pr);
92
93 static struct acpi_driver acpi_processor_driver = {
94 .name = ACPI_PROCESSOR_DRIVER_NAME,
95 .class = ACPI_PROCESSOR_CLASS,
96 .ids = ACPI_PROCESSOR_HID,
97 .ops = {
98 .add = acpi_processor_add,
99 .remove = acpi_processor_remove,
100 .start = acpi_processor_start,
101 },
102 };
103
104 #define INSTALL_NOTIFY_HANDLER 1
105 #define UNINSTALL_NOTIFY_HANDLER 2
106
107
108 static struct file_operations acpi_processor_info_fops = {
109 .open = acpi_processor_info_open_fs,
110 .read = seq_read,
111 .llseek = seq_lseek,
112 .release = single_release,
113 };
114
115
116 struct acpi_processor *processors[NR_CPUS];
117 struct acpi_processor_errata errata;
118
119
120 /* --------------------------------------------------------------------------
121 Errata Handling
122 -------------------------------------------------------------------------- */
123
124 static int
125 acpi_processor_errata_piix4 (
126 struct pci_dev *dev)
127 {
128 u8 rev = 0;
129 u8 value1 = 0;
130 u8 value2 = 0;
131
132 ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4");
133
134 if (!dev)
135 return_VALUE(-EINVAL);
136
137 /*
138 * Note that 'dev' references the PIIX4 ACPI Controller.
139 */
140
141 pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
142
143 switch (rev) {
144 case 0:
145 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
146 break;
147 case 1:
148 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
149 break;
150 case 2:
151 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
152 break;
153 case 3:
154 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
155 break;
156 default:
157 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
158 break;
159 }
160
161 switch (rev) {
162
163 case 0: /* PIIX4 A-step */
164 case 1: /* PIIX4 B-step */
165 /*
166 * See specification changes #13 ("Manual Throttle Duty Cycle")
167 * and #14 ("Enabling and Disabling Manual Throttle"), plus
168 * erratum #5 ("STPCLK# Deassertion Time") from the January
169 * 2002 PIIX4 specification update. Applies to only older
170 * PIIX4 models.
171 */
172 errata.piix4.throttle = 1;
173
174 case 2: /* PIIX4E */
175 case 3: /* PIIX4M */
176 /*
177 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
178 * Livelock") from the January 2002 PIIX4 specification update.
179 * Applies to all PIIX4 models.
180 */
181
182 /*
183 * BM-IDE
184 * ------
185 * Find the PIIX4 IDE Controller and get the Bus Master IDE
186 * Status register address. We'll use this later to read
187 * each IDE controller's DMA status to make sure we catch all
188 * DMA activity.
189 */
190 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
191 PCI_DEVICE_ID_INTEL_82371AB,
192 PCI_ANY_ID, PCI_ANY_ID, NULL);
193 if (dev) {
194 errata.piix4.bmisx = pci_resource_start(dev, 4);
195 pci_dev_put(dev);
196 }
197
198 /*
199 * Type-F DMA
200 * ----------
201 * Find the PIIX4 ISA Controller and read the Motherboard
202 * DMA controller's status to see if Type-F (Fast) DMA mode
203 * is enabled (bit 7) on either channel. Note that we'll
204 * disable C3 support if this is enabled, as some legacy
205 * devices won't operate well if fast DMA is disabled.
206 */
207 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
208 PCI_DEVICE_ID_INTEL_82371AB_0,
209 PCI_ANY_ID, PCI_ANY_ID, NULL);
210 if (dev) {
211 pci_read_config_byte(dev, 0x76, &value1);
212 pci_read_config_byte(dev, 0x77, &value2);
213 if ((value1 & 0x80) || (value2 & 0x80))
214 errata.piix4.fdma = 1;
215 pci_dev_put(dev);
216 }
217
218 break;
219 }
220
221 if (errata.piix4.bmisx)
222 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
223 "Bus master activity detection (BM-IDE) erratum enabled\n"));
224 if (errata.piix4.fdma)
225 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
226 "Type-F DMA livelock erratum (C3 disabled)\n"));
227
228 return_VALUE(0);
229 }
230
231
232 int
233 acpi_processor_errata (
234 struct acpi_processor *pr)
235 {
236 int result = 0;
237 struct pci_dev *dev = NULL;
238
239 ACPI_FUNCTION_TRACE("acpi_processor_errata");
240
241 if (!pr)
242 return_VALUE(-EINVAL);
243
244 /*
245 * PIIX4
246 */
247 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
248 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, PCI_ANY_ID, NULL);
249 if (dev) {
250 result = acpi_processor_errata_piix4(dev);
251 pci_dev_put(dev);
252 }
253
254 return_VALUE(result);
255 }
256
257
258 /* --------------------------------------------------------------------------
259 FS Interface (/proc)
260 -------------------------------------------------------------------------- */
261
262 static struct proc_dir_entry *acpi_processor_dir = NULL;
263
264 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
265 {
266 struct acpi_processor *pr = (struct acpi_processor *)seq->private;
267
268 ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
269
270 if (!pr)
271 goto end;
272
273 seq_printf(seq, "processor id: %d\n"
274 "acpi id: %d\n"
275 "bus mastering control: %s\n"
276 "power management: %s\n"
277 "throttling control: %s\n"
278 "limit interface: %s\n",
279 pr->id,
280 pr->acpi_id,
281 pr->flags.bm_control ? "yes" : "no",
282 pr->flags.power ? "yes" : "no",
283 pr->flags.throttling ? "yes" : "no",
284 pr->flags.limit ? "yes" : "no");
285
286 end:
287 return_VALUE(0);
288 }
289
290 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
291 {
292 return single_open(file, acpi_processor_info_seq_show,
293 PDE(inode)->data);
294 }
295
296
297 static int
298 acpi_processor_add_fs (
299 struct acpi_device *device)
300 {
301 struct proc_dir_entry *entry = NULL;
302
303 ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
304
305 if (!acpi_device_dir(device)) {
306 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
307 acpi_processor_dir);
308 if (!acpi_device_dir(device))
309 return_VALUE(-ENODEV);
310 }
311 acpi_device_dir(device)->owner = THIS_MODULE;
312
313 /* 'info' [R] */
314 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
315 S_IRUGO, acpi_device_dir(device));
316 if (!entry)
317 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
318 "Unable to create '%s' fs entry\n",
319 ACPI_PROCESSOR_FILE_INFO));
320 else {
321 entry->proc_fops = &acpi_processor_info_fops;
322 entry->data = acpi_driver_data(device);
323 entry->owner = THIS_MODULE;
324 }
325
326 /* 'throttling' [R/W] */
327 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
328 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
329 if (!entry)
330 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
331 "Unable to create '%s' fs entry\n",
332 ACPI_PROCESSOR_FILE_THROTTLING));
333 else {
334 entry->proc_fops = &acpi_processor_throttling_fops;
335 entry->proc_fops->write = acpi_processor_write_throttling;
336 entry->data = acpi_driver_data(device);
337 entry->owner = THIS_MODULE;
338 }
339
340 /* 'limit' [R/W] */
341 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
342 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
343 if (!entry)
344 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
345 "Unable to create '%s' fs entry\n",
346 ACPI_PROCESSOR_FILE_LIMIT));
347 else {
348 entry->proc_fops = &acpi_processor_limit_fops;
349 entry->proc_fops->write = acpi_processor_write_limit;
350 entry->data = acpi_driver_data(device);
351 entry->owner = THIS_MODULE;
352 }
353
354 return_VALUE(0);
355 }
356
357
358 static int
359 acpi_processor_remove_fs (
360 struct acpi_device *device)
361 {
362 ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
363
364 if (acpi_device_dir(device)) {
365 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,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,acpi_device_dir(device));
369 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
370 acpi_device_dir(device) = NULL;
371 }
372
373 return_VALUE(0);
374 }
375
376 /* Use the acpiid in MADT to map cpus in case of SMP */
377 #ifndef CONFIG_SMP
378 #define convert_acpiid_to_cpu(acpi_id) (0xff)
379 #else
380
381 #ifdef CONFIG_IA64
382 #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid
383 #define arch_cpu_to_apicid ia64_cpu_to_sapicid
384 #define ARCH_BAD_APICID (0xffff)
385 #else
386 #define arch_acpiid_to_apicid x86_acpiid_to_apicid
387 #define arch_cpu_to_apicid x86_cpu_to_apicid
388 #define ARCH_BAD_APICID (0xff)
389 #endif
390
391 static u8 convert_acpiid_to_cpu(u8 acpi_id)
392 {
393 u16 apic_id;
394 int i;
395
396 apic_id = arch_acpiid_to_apicid[acpi_id];
397 if (apic_id == ARCH_BAD_APICID)
398 return -1;
399
400 for (i = 0; i < NR_CPUS; i++) {
401 if (arch_cpu_to_apicid[i] == apic_id)
402 return i;
403 }
404 return -1;
405 }
406 #endif
407
408 /* --------------------------------------------------------------------------
409 Driver Interface
410 -------------------------------------------------------------------------- */
411
412 static int
413 acpi_processor_get_info (
414 struct acpi_processor *pr)
415 {
416 acpi_status status = 0;
417 union acpi_object object = {0};
418 struct acpi_buffer buffer = {sizeof(union acpi_object), &object};
419 u8 cpu_index;
420 static int cpu0_initialized;
421
422 ACPI_FUNCTION_TRACE("acpi_processor_get_info");
423
424 if (!pr)
425 return_VALUE(-EINVAL);
426
427 if (num_online_cpus() > 1)
428 errata.smp = TRUE;
429
430 acpi_processor_errata(pr);
431
432 /*
433 * Check to see if we have bus mastering arbitration control. This
434 * is required for proper C3 usage (to maintain cache coherency).
435 */
436 if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
437 pr->flags.bm_control = 1;
438 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
439 "Bus mastering arbitration control present\n"));
440 }
441 else
442 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
443 "No bus mastering arbitration control\n"));
444
445 /*
446 * Evalute the processor object. Note that it is common on SMP to
447 * have the first (boot) processor with a valid PBLK address while
448 * all others have a NULL address.
449 */
450 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
451 if (ACPI_FAILURE(status)) {
452 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
453 "Error evaluating processor object\n"));
454 return_VALUE(-ENODEV);
455 }
456
457 /*
458 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
459 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
460 */
461 pr->acpi_id = object.processor.proc_id;
462
463 cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
464
465 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
466 if ( !cpu0_initialized && (cpu_index == 0xff) &&
467 (num_online_cpus() == 1)) {
468 cpu_index = 0;
469 }
470
471 cpu0_initialized = 1;
472
473 pr->id = cpu_index;
474
475 /*
476 * Extra Processor objects may be enumerated on MP systems with
477 * less than the max # of CPUs. They should be ignored _iff
478 * they are physically not present.
479 */
480 if (cpu_index >= NR_CPUS) {
481 if (ACPI_FAILURE(acpi_processor_hotadd_init(pr->handle, &pr->id))) {
482 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
483 "Error getting cpuindex for acpiid 0x%x\n",
484 pr->acpi_id));
485 return_VALUE(-ENODEV);
486 }
487 }
488
489 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
490 pr->acpi_id));
491
492 if (!object.processor.pblk_address)
493 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
494 else if (object.processor.pblk_length != 6)
495 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n",
496 object.processor.pblk_length));
497 else {
498 pr->throttling.address = object.processor.pblk_address;
499 pr->throttling.duty_offset = acpi_fadt.duty_offset;
500 pr->throttling.duty_width = acpi_fadt.duty_width;
501
502 pr->pblk = object.processor.pblk_address;
503
504 /*
505 * We don't care about error returns - we just try to mark
506 * these reserved so that nobody else is confused into thinking
507 * that this region might be unused..
508 *
509 * (In particular, allocating the IO range for Cardbus)
510 */
511 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
512 }
513
514 #ifdef CONFIG_CPU_FREQ
515 acpi_processor_ppc_has_changed(pr);
516 #endif
517 acpi_processor_get_throttling_info(pr);
518 acpi_processor_get_limit_info(pr);
519
520 return_VALUE(0);
521 }
522
523 static int
524 acpi_processor_start(
525 struct acpi_device *device)
526 {
527 int result = 0;
528 acpi_status status = AE_OK;
529 struct acpi_processor *pr;
530
531 ACPI_FUNCTION_TRACE("acpi_processor_start");
532
533 pr = acpi_driver_data(device);
534
535 result = acpi_processor_get_info(pr);
536 if (result) {
537 /* Processor is physically not present */
538 return_VALUE(0);
539 }
540
541 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
542
543 processors[pr->id] = pr;
544
545 result = acpi_processor_add_fs(device);
546 if (result)
547 goto end;
548
549 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
550 acpi_processor_notify, pr);
551 if (ACPI_FAILURE(status)) {
552 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
553 "Error installing device notify handler\n"));
554 }
555
556 acpi_processor_power_init(pr, device);
557
558 if (pr->flags.throttling) {
559 printk(KERN_INFO PREFIX "%s [%s] (supports",
560 acpi_device_name(device), acpi_device_bid(device));
561 printk(" %d throttling states", pr->throttling.state_count);
562 printk(")\n");
563 }
564
565 end:
566
567 return_VALUE(result);
568 }
569
570
571
572 static void
573 acpi_processor_notify (
574 acpi_handle handle,
575 u32 event,
576 void *data)
577 {
578 struct acpi_processor *pr = (struct acpi_processor *) data;
579 struct acpi_device *device = NULL;
580
581 ACPI_FUNCTION_TRACE("acpi_processor_notify");
582
583 if (!pr)
584 return_VOID;
585
586 if (acpi_bus_get_device(pr->handle, &device))
587 return_VOID;
588
589 switch (event) {
590 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
591 acpi_processor_ppc_has_changed(pr);
592 acpi_bus_generate_event(device, event,
593 pr->performance_platform_limit);
594 break;
595 case ACPI_PROCESSOR_NOTIFY_POWER:
596 acpi_processor_cst_has_changed(pr);
597 acpi_bus_generate_event(device, event, 0);
598 break;
599 default:
600 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
601 "Unsupported event [0x%x]\n", event));
602 break;
603 }
604
605 return_VOID;
606 }
607
608
609 static int
610 acpi_processor_add (
611 struct acpi_device *device)
612 {
613 struct acpi_processor *pr = NULL;
614
615 ACPI_FUNCTION_TRACE("acpi_processor_add");
616
617 if (!device)
618 return_VALUE(-EINVAL);
619
620 pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
621 if (!pr)
622 return_VALUE(-ENOMEM);
623 memset(pr, 0, sizeof(struct acpi_processor));
624
625 pr->handle = device->handle;
626 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
627 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
628 acpi_driver_data(device) = pr;
629
630 return_VALUE(0);
631 }
632
633
634 static int
635 acpi_processor_remove (
636 struct acpi_device *device,
637 int type)
638 {
639 acpi_status status = AE_OK;
640 struct acpi_processor *pr = NULL;
641
642 ACPI_FUNCTION_TRACE("acpi_processor_remove");
643
644 if (!device || !acpi_driver_data(device))
645 return_VALUE(-EINVAL);
646
647 pr = (struct acpi_processor *) acpi_driver_data(device);
648
649 if (pr->id >= NR_CPUS) {
650 kfree(pr);
651 return_VALUE(0);
652 }
653
654 if (type == ACPI_BUS_REMOVAL_EJECT) {
655 if (acpi_processor_handle_eject(pr))
656 return_VALUE(-EINVAL);
657 }
658
659 acpi_processor_power_exit(pr, device);
660
661 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
662 acpi_processor_notify);
663 if (ACPI_FAILURE(status)) {
664 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
665 "Error removing notify handler\n"));
666 }
667
668 acpi_processor_remove_fs(device);
669
670 processors[pr->id] = NULL;
671
672 kfree(pr);
673
674 return_VALUE(0);
675 }
676
677 #ifdef CONFIG_ACPI_HOTPLUG_CPU
678 /****************************************************************************
679 * Acpi processor hotplug support *
680 ****************************************************************************/
681
682 static int is_processor_present(acpi_handle handle);
683
684 static int
685 is_processor_present(
686 acpi_handle handle)
687 {
688 acpi_status status;
689 unsigned long sta = 0;
690
691 ACPI_FUNCTION_TRACE("is_processor_present");
692
693 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
694 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
695 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
696 "Processor Device is not present\n"));
697 return_VALUE(0);
698 }
699 return_VALUE(1);
700 }
701
702
703 static
704 int acpi_processor_device_add(
705 acpi_handle handle,
706 struct acpi_device **device)
707 {
708 acpi_handle phandle;
709 struct acpi_device *pdev;
710 struct acpi_processor *pr;
711
712 ACPI_FUNCTION_TRACE("acpi_processor_device_add");
713
714 if (acpi_get_parent(handle, &phandle)) {
715 return_VALUE(-ENODEV);
716 }
717
718 if (acpi_bus_get_device(phandle, &pdev)) {
719 return_VALUE(-ENODEV);
720 }
721
722 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
723 return_VALUE(-ENODEV);
724 }
725
726 acpi_bus_scan(*device);
727
728 pr = acpi_driver_data(*device);
729 if (!pr)
730 return_VALUE(-ENODEV);
731
732 if ((pr->id >=0) && (pr->id < NR_CPUS)) {
733 kobject_hotplug(&(*device)->kobj, KOBJ_ONLINE);
734 }
735 return_VALUE(0);
736 }
737
738
739 static void
740 acpi_processor_hotplug_notify (
741 acpi_handle handle,
742 u32 event,
743 void *data)
744 {
745 struct acpi_processor *pr;
746 struct acpi_device *device = NULL;
747 int result;
748
749 ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
750
751 switch (event) {
752 case ACPI_NOTIFY_BUS_CHECK:
753 case ACPI_NOTIFY_DEVICE_CHECK:
754 printk("Processor driver received %s event\n",
755 (event==ACPI_NOTIFY_BUS_CHECK)?
756 "ACPI_NOTIFY_BUS_CHECK":"ACPI_NOTIFY_DEVICE_CHECK");
757
758 if (!is_processor_present(handle))
759 break;
760
761 if (acpi_bus_get_device(handle, &device)) {
762 result = acpi_processor_device_add(handle, &device);
763 if (result)
764 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
765 "Unable to add the device\n"));
766 break;
767 }
768
769 pr = acpi_driver_data(device);
770 if (!pr) {
771 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
772 "Driver data is NULL\n"));
773 break;
774 }
775
776 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
777 kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
778 break;
779 }
780
781 result = acpi_processor_start(device);
782 if ((!result) && ((pr->id >=0) && (pr->id < NR_CPUS))) {
783 kobject_hotplug(&device->kobj, KOBJ_ONLINE);
784 } else {
785 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
786 "Device [%s] failed to start\n",
787 acpi_device_bid(device)));
788 }
789 break;
790 case ACPI_NOTIFY_EJECT_REQUEST:
791 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"received ACPI_NOTIFY_EJECT_REQUEST\n"));
792
793 if (acpi_bus_get_device(handle, &device)) {
794 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Device don't exist, dropping EJECT\n"));
795 break;
796 }
797 pr = acpi_driver_data(device);
798 if (!pr) {
799 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Driver data is NULL, dropping EJECT\n"));
800 return_VOID;
801 }
802
803 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
804 kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
805 break;
806 default:
807 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
808 "Unsupported event [0x%x]\n", event));
809 break;
810 }
811
812 return_VOID;
813 }
814
815 static acpi_status
816 processor_walk_namespace_cb(acpi_handle handle,
817 u32 lvl,
818 void *context,
819 void **rv)
820 {
821 acpi_status status;
822 int *action = context;
823 acpi_object_type type = 0;
824
825 status = acpi_get_type(handle, &type);
826 if (ACPI_FAILURE(status))
827 return(AE_OK);
828
829 if (type != ACPI_TYPE_PROCESSOR)
830 return(AE_OK);
831
832 switch(*action) {
833 case INSTALL_NOTIFY_HANDLER:
834 acpi_install_notify_handler(handle,
835 ACPI_SYSTEM_NOTIFY,
836 acpi_processor_hotplug_notify,
837 NULL);
838 break;
839 case UNINSTALL_NOTIFY_HANDLER:
840 acpi_remove_notify_handler(handle,
841 ACPI_SYSTEM_NOTIFY,
842 acpi_processor_hotplug_notify);
843 break;
844 default:
845 break;
846 }
847
848 return(AE_OK);
849 }
850
851
852 static acpi_status
853 acpi_processor_hotadd_init(
854 acpi_handle handle,
855 int *p_cpu)
856 {
857 ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
858
859 if (!is_processor_present(handle)) {
860 return_VALUE(AE_ERROR);
861 }
862
863 if (acpi_map_lsapic(handle, p_cpu))
864 return_VALUE(AE_ERROR);
865
866 if (arch_register_cpu(*p_cpu)) {
867 acpi_unmap_lsapic(*p_cpu);
868 return_VALUE(AE_ERROR);
869 }
870
871 return_VALUE(AE_OK);
872 }
873
874
875 static int
876 acpi_processor_handle_eject(struct acpi_processor *pr)
877 {
878 if (cpu_online(pr->id)) {
879 return(-EINVAL);
880 }
881 arch_unregister_cpu(pr->id);
882 acpi_unmap_lsapic(pr->id);
883 return(0);
884 }
885 #else
886 static acpi_status
887 acpi_processor_hotadd_init(
888 acpi_handle handle,
889 int *p_cpu)
890 {
891 return AE_ERROR;
892 }
893 static int
894 acpi_processor_handle_eject(struct acpi_processor *pr)
895 {
896 return(-EINVAL);
897 }
898 #endif
899
900
901 static
902 void acpi_processor_install_hotplug_notify(void)
903 {
904 #ifdef CONFIG_ACPI_HOTPLUG_CPU
905 int action = INSTALL_NOTIFY_HANDLER;
906 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
907 ACPI_ROOT_OBJECT,
908 ACPI_UINT32_MAX,
909 processor_walk_namespace_cb,
910 &action, NULL);
911 #endif
912 }
913
914
915 static
916 void acpi_processor_uninstall_hotplug_notify(void)
917 {
918 #ifdef CONFIG_ACPI_HOTPLUG_CPU
919 int action = UNINSTALL_NOTIFY_HANDLER;
920 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
921 ACPI_ROOT_OBJECT,
922 ACPI_UINT32_MAX,
923 processor_walk_namespace_cb,
924 &action, NULL);
925 #endif
926 }
927
928 /*
929 * We keep the driver loaded even when ACPI is not running.
930 * This is needed for the powernow-k8 driver, that works even without
931 * ACPI, but needs symbols from this driver
932 */
933
934 static int __init
935 acpi_processor_init (void)
936 {
937 int result = 0;
938
939 ACPI_FUNCTION_TRACE("acpi_processor_init");
940
941 memset(&processors, 0, sizeof(processors));
942 memset(&errata, 0, sizeof(errata));
943
944 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
945 if (!acpi_processor_dir)
946 return_VALUE(0);
947 acpi_processor_dir->owner = THIS_MODULE;
948
949 result = acpi_bus_register_driver(&acpi_processor_driver);
950 if (result < 0) {
951 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
952 return_VALUE(0);
953 }
954
955 acpi_processor_install_hotplug_notify();
956
957 acpi_thermal_cpufreq_init();
958
959 acpi_processor_ppc_init();
960
961 return_VALUE(0);
962 }
963
964
965 static void __exit
966 acpi_processor_exit (void)
967 {
968 ACPI_FUNCTION_TRACE("acpi_processor_exit");
969
970 acpi_processor_ppc_exit();
971
972 acpi_thermal_cpufreq_exit();
973
974 acpi_processor_uninstall_hotplug_notify();
975
976 acpi_bus_unregister_driver(&acpi_processor_driver);
977
978 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
979
980 return_VOID;
981 }
982
983
984 module_init(acpi_processor_init);
985 module_exit(acpi_processor_exit);
986
987 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
988
989 MODULE_ALIAS("processor");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree