processor_core.c revision 6468463abd7051fcc29f3ee7c931f9bbbb26f5a4 
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_DRIVER_NAME	"ACPI Processor Driver"
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
71#define ACPI_PROCESSOR_LIMIT_USER	0
72#define ACPI_PROCESSOR_LIMIT_THERMAL	1
73
74#define ACPI_STA_PRESENT 0x00000001
75
76#define _COMPONENT		ACPI_PROCESSOR_COMPONENT
77ACPI_MODULE_NAME("acpi_processor")
78
79    MODULE_AUTHOR("Paul Diefenbaugh");
80MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
81MODULE_LICENSE("GPL");
82
83static int acpi_processor_add(struct acpi_device *device);
84static int acpi_processor_start(struct acpi_device *device);
85static int acpi_processor_remove(struct acpi_device *device, int type);
86static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
87static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
88static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
89static int acpi_processor_handle_eject(struct acpi_processor *pr);
90
91static struct acpi_driver acpi_processor_driver = {
92	.name = ACPI_PROCESSOR_DRIVER_NAME,
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
105static 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
112struct acpi_processor *processors[NR_CPUS];
113struct acpi_processor_errata errata __read_mostly;
114
115/* --------------------------------------------------------------------------
116                                Errata Handling
117   -------------------------------------------------------------------------- */
118
119static int acpi_processor_errata_piix4(struct pci_dev *dev)
120{
121	u8 rev = 0;
122	u8 value1 = 0;
123	u8 value2 = 0;
124
125	ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4");
126
127	if (!dev)
128		return_VALUE(-EINVAL);
129
130	/*
131	 * Note that 'dev' references the PIIX4 ACPI Controller.
132	 */
133
134	pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
135
136	switch (rev) {
137	case 0:
138		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
139		break;
140	case 1:
141		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
142		break;
143	case 2:
144		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
145		break;
146	case 3:
147		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
148		break;
149	default:
150		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
151		break;
152	}
153
154	switch (rev) {
155
156	case 0:		/* PIIX4 A-step */
157	case 1:		/* PIIX4 B-step */
158		/*
159		 * See specification changes #13 ("Manual Throttle Duty Cycle")
160		 * and #14 ("Enabling and Disabling Manual Throttle"), plus
161		 * erratum #5 ("STPCLK# Deassertion Time") from the January
162		 * 2002 PIIX4 specification update.  Applies to only older
163		 * PIIX4 models.
164		 */
165		errata.piix4.throttle = 1;
166
167	case 2:		/* PIIX4E */
168	case 3:		/* PIIX4M */
169		/*
170		 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
171		 * Livelock") from the January 2002 PIIX4 specification update.
172		 * Applies to all PIIX4 models.
173		 */
174
175		/*
176		 * BM-IDE
177		 * ------
178		 * Find the PIIX4 IDE Controller and get the Bus Master IDE
179		 * Status register address.  We'll use this later to read
180		 * each IDE controller's DMA status to make sure we catch all
181		 * DMA activity.
182		 */
183		dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
184				     PCI_DEVICE_ID_INTEL_82371AB,
185				     PCI_ANY_ID, PCI_ANY_ID, NULL);
186		if (dev) {
187			errata.piix4.bmisx = pci_resource_start(dev, 4);
188			pci_dev_put(dev);
189		}
190
191		/*
192		 * Type-F DMA
193		 * ----------
194		 * Find the PIIX4 ISA Controller and read the Motherboard
195		 * DMA controller's status to see if Type-F (Fast) DMA mode
196		 * is enabled (bit 7) on either channel.  Note that we'll
197		 * disable C3 support if this is enabled, as some legacy
198		 * devices won't operate well if fast DMA is disabled.
199		 */
200		dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
201				     PCI_DEVICE_ID_INTEL_82371AB_0,
202				     PCI_ANY_ID, PCI_ANY_ID, NULL);
203		if (dev) {
204			pci_read_config_byte(dev, 0x76, &value1);
205			pci_read_config_byte(dev, 0x77, &value2);
206			if ((value1 & 0x80) || (value2 & 0x80))
207				errata.piix4.fdma = 1;
208			pci_dev_put(dev);
209		}
210
211		break;
212	}
213
214	if (errata.piix4.bmisx)
215		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
216				  "Bus master activity detection (BM-IDE) erratum enabled\n"));
217	if (errata.piix4.fdma)
218		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
219				  "Type-F DMA livelock erratum (C3 disabled)\n"));
220
221	return_VALUE(0);
222}
223
224static int acpi_processor_errata(struct acpi_processor *pr)
225{
226	int result = 0;
227	struct pci_dev *dev = NULL;
228
229	ACPI_FUNCTION_TRACE("acpi_processor_errata");
230
231	if (!pr)
232		return_VALUE(-EINVAL);
233
234	/*
235	 * PIIX4
236	 */
237	dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
238			     PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
239			     PCI_ANY_ID, NULL);
240	if (dev) {
241		result = acpi_processor_errata_piix4(dev);
242		pci_dev_put(dev);
243	}
244
245	return_VALUE(result);
246}
247
248/* --------------------------------------------------------------------------
249                              Common ACPI processor functions
250   -------------------------------------------------------------------------- */
251
252/*
253 * _PDC is required for a BIOS-OS handshake for most of the newer
254 * ACPI processor features.
255 */
256static int acpi_processor_set_pdc(struct acpi_processor *pr)
257{
258	struct acpi_object_list *pdc_in = pr->pdc;
259	acpi_status status = AE_OK;
260
261	ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
262
263	if (!pdc_in)
264		return_VALUE(status);
265
266	status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
267
268	if (ACPI_FAILURE(status))
269		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
270		    "Could not evaluate _PDC, using legacy perf. control...\n"));
271
272	return_VALUE(status);
273}
274
275/* --------------------------------------------------------------------------
276                              FS Interface (/proc)
277   -------------------------------------------------------------------------- */
278
279static struct proc_dir_entry *acpi_processor_dir = NULL;
280
281static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
282{
283	struct acpi_processor *pr = (struct acpi_processor *)seq->private;
284
285	ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
286
287	if (!pr)
288		goto end;
289
290	seq_printf(seq, "processor id:            %d\n"
291		   "acpi id:                 %d\n"
292		   "bus mastering control:   %s\n"
293		   "power management:        %s\n"
294		   "throttling control:      %s\n"
295		   "limit interface:         %s\n",
296		   pr->id,
297		   pr->acpi_id,
298		   pr->flags.bm_control ? "yes" : "no",
299		   pr->flags.power ? "yes" : "no",
300		   pr->flags.throttling ? "yes" : "no",
301		   pr->flags.limit ? "yes" : "no");
302
303      end:
304	return_VALUE(0);
305}
306
307static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
308{
309	return single_open(file, acpi_processor_info_seq_show,
310			   PDE(inode)->data);
311}
312
313static int acpi_processor_add_fs(struct acpi_device *device)
314{
315	struct proc_dir_entry *entry = NULL;
316
317	ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
318
319	if (!acpi_device_dir(device)) {
320		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
321						     acpi_processor_dir);
322		if (!acpi_device_dir(device))
323			return_VALUE(-ENODEV);
324	}
325	acpi_device_dir(device)->owner = THIS_MODULE;
326
327	/* 'info' [R] */
328	entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
329				  S_IRUGO, acpi_device_dir(device));
330	if (!entry)
331		return_VALUE(-EIO);
332	else {
333		entry->proc_fops = &acpi_processor_info_fops;
334		entry->data = acpi_driver_data(device);
335		entry->owner = THIS_MODULE;
336	}
337
338	/* 'throttling' [R/W] */
339	entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
340				  S_IFREG | S_IRUGO | S_IWUSR,
341				  acpi_device_dir(device));
342	if (!entry)
343		return_VALUE(-EIO);
344	else {
345		entry->proc_fops = &acpi_processor_throttling_fops;
346		entry->data = acpi_driver_data(device);
347		entry->owner = THIS_MODULE;
348	}
349
350	/* 'limit' [R/W] */
351	entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
352				  S_IFREG | S_IRUGO | S_IWUSR,
353				  acpi_device_dir(device));
354	if (!entry)
355		return_VALUE( -EIO);
356	else {
357		entry->proc_fops = &acpi_processor_limit_fops;
358		entry->data = acpi_driver_data(device);
359		entry->owner = THIS_MODULE;
360	}
361
362	return_VALUE(0);
363}
364
365static int acpi_processor_remove_fs(struct acpi_device *device)
366{
367	ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
368
369	if (acpi_device_dir(device)) {
370		remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
371				  acpi_device_dir(device));
372		remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
373				  acpi_device_dir(device));
374		remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
375				  acpi_device_dir(device));
376		remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
377		acpi_device_dir(device) = NULL;
378	}
379
380	return_VALUE(0);
381}
382
383/* Use the acpiid in MADT to map cpus in case of SMP */
384#ifndef CONFIG_SMP
385#define convert_acpiid_to_cpu(acpi_id) (-1)
386#else
387
388#ifdef CONFIG_IA64
389#define arch_acpiid_to_apicid 	ia64_acpiid_to_sapicid
390#define arch_cpu_to_apicid 	ia64_cpu_to_sapicid
391#define ARCH_BAD_APICID		(0xffff)
392#else
393#define arch_acpiid_to_apicid 	x86_acpiid_to_apicid
394#define arch_cpu_to_apicid 	x86_cpu_to_apicid
395#define ARCH_BAD_APICID		(0xff)
396#endif
397
398static int convert_acpiid_to_cpu(u8 acpi_id)
399{
400	u16 apic_id;
401	int i;
402
403	apic_id = arch_acpiid_to_apicid[acpi_id];
404	if (apic_id == ARCH_BAD_APICID)
405		return -1;
406
407	for (i = 0; i < NR_CPUS; i++) {
408		if (arch_cpu_to_apicid[i] == apic_id)
409			return i;
410	}
411	return -1;
412}
413#endif
414
415/* --------------------------------------------------------------------------
416                                 Driver Interface
417   -------------------------------------------------------------------------- */
418
419static int acpi_processor_get_info(struct acpi_processor *pr)
420{
421	acpi_status status = 0;
422	union acpi_object object = { 0 };
423	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
424	int cpu_index;
425	static int cpu0_initialized;
426
427	ACPI_FUNCTION_TRACE("acpi_processor_get_info");
428
429	if (!pr)
430		return_VALUE(-EINVAL);
431
432	if (num_online_cpus() > 1)
433		errata.smp = TRUE;
434
435	acpi_processor_errata(pr);
436
437	/*
438	 * Check to see if we have bus mastering arbitration control.  This
439	 * is required for proper C3 usage (to maintain cache coherency).
440	 */
441	if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
442		pr->flags.bm_control = 1;
443		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
444				  "Bus mastering arbitration control present\n"));
445	} else
446		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
447				  "No bus mastering arbitration control\n"));
448
449	/*
450	 * Evalute the processor object.  Note that it is common on SMP to
451	 * have the first (boot) processor with a valid PBLK address while
452	 * all others have a NULL address.
453	 */
454	status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
455	if (ACPI_FAILURE(status)) {
456		printk(KERN_ERR PREFIX "Evaluating processor object\n");
457		return_VALUE(-ENODEV);
458	}
459
460	/*
461	 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
462	 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
463	 */
464	pr->acpi_id = object.processor.proc_id;
465
466	cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
467
468	/* Handle UP system running SMP kernel, with no LAPIC in MADT */
469	if (!cpu0_initialized && (cpu_index == -1) &&
470	    (num_online_cpus() == 1)) {
471		cpu_index = 0;
472	}
473
474	cpu0_initialized = 1;
475
476	pr->id = cpu_index;
477
478	/*
479	 *  Extra Processor objects may be enumerated on MP systems with
480	 *  less than the max # of CPUs. They should be ignored _iff
481	 *  they are physically not present.
482	 */
483	if (cpu_index == -1) {
484		if (ACPI_FAILURE
485		    (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
486			printk(KERN_ERR PREFIX
487				    "Getting cpuindex for acpiid 0x%x\n",
488				    pr->acpi_id);
489			return_VALUE(-ENODEV);
490		}
491	}
492
493	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
494			  pr->acpi_id));
495
496	if (!object.processor.pblk_address)
497		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
498	else if (object.processor.pblk_length != 6)
499		printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
500			    object.processor.pblk_length);
501	else {
502		pr->throttling.address = object.processor.pblk_address;
503		pr->throttling.duty_offset = acpi_fadt.duty_offset;
504		pr->throttling.duty_width = acpi_fadt.duty_width;
505
506		pr->pblk = object.processor.pblk_address;
507
508		/*
509		 * We don't care about error returns - we just try to mark
510		 * these reserved so that nobody else is confused into thinking
511		 * that this region might be unused..
512		 *
513		 * (In particular, allocating the IO range for Cardbus)
514		 */
515		request_region(pr->throttling.address, 6, "ACPI CPU throttle");
516	}
517
518#ifdef CONFIG_CPU_FREQ
519	acpi_processor_ppc_has_changed(pr);
520#endif
521	acpi_processor_get_throttling_info(pr);
522	acpi_processor_get_limit_info(pr);
523
524	return_VALUE(0);
525}
526
527static void *processor_device_array[NR_CPUS];
528
529static int acpi_processor_start(struct acpi_device *device)
530{
531	int result = 0;
532	acpi_status status = AE_OK;
533	struct acpi_processor *pr;
534
535	ACPI_FUNCTION_TRACE("acpi_processor_start");
536
537	pr = acpi_driver_data(device);
538
539	result = acpi_processor_get_info(pr);
540	if (result) {
541		/* Processor is physically not present */
542		return_VALUE(0);
543	}
544
545	BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
546
547	/*
548	 * Buggy BIOS check
549	 * ACPI id of processors can be reported wrongly by the BIOS.
550	 * Don't trust it blindly
551	 */
552	if (processor_device_array[pr->id] != NULL &&
553	    processor_device_array[pr->id] != (void *)device) {
554		printk(KERN_WARNING "BIOS reported wrong ACPI id"
555			"for the processor\n");
556		return_VALUE(-ENODEV);
557	}
558	processor_device_array[pr->id] = (void *)device;
559
560	processors[pr->id] = pr;
561
562	result = acpi_processor_add_fs(device);
563	if (result)
564		goto end;
565
566	status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
567					     acpi_processor_notify, pr);
568
569	/* _PDC call should be done before doing anything else (if reqd.). */
570	arch_acpi_processor_init_pdc(pr);
571	acpi_processor_set_pdc(pr);
572
573	acpi_processor_power_init(pr, device);
574
575	if (pr->flags.throttling) {
576		printk(KERN_INFO PREFIX "%s [%s] (supports",
577		       acpi_device_name(device), acpi_device_bid(device));
578		printk(" %d throttling states", pr->throttling.state_count);
579		printk(")\n");
580	}
581
582      end:
583
584	return_VALUE(result);
585}
586
587static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
588{
589	struct acpi_processor *pr = (struct acpi_processor *)data;
590	struct acpi_device *device = NULL;
591
592	ACPI_FUNCTION_TRACE("acpi_processor_notify");
593
594	if (!pr)
595		return_VOID;
596
597	if (acpi_bus_get_device(pr->handle, &device))
598		return_VOID;
599
600	switch (event) {
601	case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
602		acpi_processor_ppc_has_changed(pr);
603		acpi_bus_generate_event(device, event,
604					pr->performance_platform_limit);
605		break;
606	case ACPI_PROCESSOR_NOTIFY_POWER:
607		acpi_processor_cst_has_changed(pr);
608		acpi_bus_generate_event(device, event, 0);
609		break;
610	default:
611		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
612				  "Unsupported event [0x%x]\n", event));
613		break;
614	}
615
616	return_VOID;
617}
618
619static int acpi_processor_add(struct acpi_device *device)
620{
621	struct acpi_processor *pr = NULL;
622
623	ACPI_FUNCTION_TRACE("acpi_processor_add");
624
625	if (!device)
626		return_VALUE(-EINVAL);
627
628	pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
629	if (!pr)
630		return_VALUE(-ENOMEM);
631	memset(pr, 0, sizeof(struct acpi_processor));
632
633	pr->handle = device->handle;
634	strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
635	strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
636	acpi_driver_data(device) = pr;
637
638	return_VALUE(0);
639}
640
641static int acpi_processor_remove(struct acpi_device *device, int type)
642{
643	acpi_status status = AE_OK;
644	struct acpi_processor *pr = NULL;
645
646	ACPI_FUNCTION_TRACE("acpi_processor_remove");
647
648	if (!device || !acpi_driver_data(device))
649		return_VALUE(-EINVAL);
650
651	pr = (struct acpi_processor *)acpi_driver_data(device);
652
653	if (pr->id >= NR_CPUS) {
654		kfree(pr);
655		return_VALUE(0);
656	}
657
658	if (type == ACPI_BUS_REMOVAL_EJECT) {
659		if (acpi_processor_handle_eject(pr))
660			return_VALUE(-EINVAL);
661	}
662
663	acpi_processor_power_exit(pr, device);
664
665	status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
666					    acpi_processor_notify);
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
682static int is_processor_present(acpi_handle handle);
683
684static int is_processor_present(acpi_handle handle)
685{
686	acpi_status status;
687	unsigned long sta = 0;
688
689	ACPI_FUNCTION_TRACE("is_processor_present");
690
691	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
692	if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
693		ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
694		return_VALUE(0);
695	}
696	return_VALUE(1);
697}
698
699static
700int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
701{
702	acpi_handle phandle;
703	struct acpi_device *pdev;
704	struct acpi_processor *pr;
705
706	ACPI_FUNCTION_TRACE("acpi_processor_device_add");
707
708	if (acpi_get_parent(handle, &phandle)) {
709		return_VALUE(-ENODEV);
710	}
711
712	if (acpi_bus_get_device(phandle, &pdev)) {
713		return_VALUE(-ENODEV);
714	}
715
716	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
717		return_VALUE(-ENODEV);
718	}
719
720	acpi_bus_start(*device);
721
722	pr = acpi_driver_data(*device);
723	if (!pr)
724		return_VALUE(-ENODEV);
725
726	if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
727		kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
728	}
729	return_VALUE(0);
730}
731
732static void
733acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
734{
735	struct acpi_processor *pr;
736	struct acpi_device *device = NULL;
737	int result;
738
739	ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
740
741	switch (event) {
742	case ACPI_NOTIFY_BUS_CHECK:
743	case ACPI_NOTIFY_DEVICE_CHECK:
744		printk("Processor driver received %s event\n",
745		       (event == ACPI_NOTIFY_BUS_CHECK) ?
746		       "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
747
748		if (!is_processor_present(handle))
749			break;
750
751		if (acpi_bus_get_device(handle, &device)) {
752			result = acpi_processor_device_add(handle, &device);
753			if (result)
754				printk(KERN_ERR PREFIX
755					    "Unable to add the device\n");
756			break;
757		}
758
759		pr = acpi_driver_data(device);
760		if (!pr) {
761			printk(KERN_ERR PREFIX "Driver data is NULL\n");
762			break;
763		}
764
765		if (pr->id >= 0 && (pr->id < NR_CPUS)) {
766			kobject_uevent(&device->kobj, KOBJ_OFFLINE);
767			break;
768		}
769
770		result = acpi_processor_start(device);
771		if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
772			kobject_uevent(&device->kobj, KOBJ_ONLINE);
773		} else {
774			printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
775				    acpi_device_bid(device));
776		}
777		break;
778	case ACPI_NOTIFY_EJECT_REQUEST:
779		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
780				  "received ACPI_NOTIFY_EJECT_REQUEST\n"));
781
782		if (acpi_bus_get_device(handle, &device)) {
783			printk(KERN_ERR PREFIX
784				    "Device don't exist, dropping EJECT\n");
785			break;
786		}
787		pr = acpi_driver_data(device);
788		if (!pr) {
789			printk(KERN_ERR PREFIX
790				    "Driver data is NULL, dropping EJECT\n");
791			return_VOID;
792		}
793
794		if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
795			kobject_uevent(&device->kobj, KOBJ_OFFLINE);
796		break;
797	default:
798		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
799				  "Unsupported event [0x%x]\n", event));
800		break;
801	}
802
803	return_VOID;
804}
805
806static acpi_status
807processor_walk_namespace_cb(acpi_handle handle,
808			    u32 lvl, void *context, void **rv)
809{
810	acpi_status status;
811	int *action = context;
812	acpi_object_type type = 0;
813
814	status = acpi_get_type(handle, &type);
815	if (ACPI_FAILURE(status))
816		return (AE_OK);
817
818	if (type != ACPI_TYPE_PROCESSOR)
819		return (AE_OK);
820
821	switch (*action) {
822	case INSTALL_NOTIFY_HANDLER:
823		acpi_install_notify_handler(handle,
824					    ACPI_SYSTEM_NOTIFY,
825					    acpi_processor_hotplug_notify,
826					    NULL);
827		break;
828	case UNINSTALL_NOTIFY_HANDLER:
829		acpi_remove_notify_handler(handle,
830					   ACPI_SYSTEM_NOTIFY,
831					   acpi_processor_hotplug_notify);
832		break;
833	default:
834		break;
835	}
836
837	return (AE_OK);
838}
839
840static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
841{
842	ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
843
844	if (!is_processor_present(handle)) {
845		return_VALUE(AE_ERROR);
846	}
847
848	if (acpi_map_lsapic(handle, p_cpu))
849		return_VALUE(AE_ERROR);
850
851	if (arch_register_cpu(*p_cpu)) {
852		acpi_unmap_lsapic(*p_cpu);
853		return_VALUE(AE_ERROR);
854	}
855
856	return_VALUE(AE_OK);
857}
858
859static int acpi_processor_handle_eject(struct acpi_processor *pr)
860{
861	if (cpu_online(pr->id)) {
862		return (-EINVAL);
863	}
864	arch_unregister_cpu(pr->id);
865	acpi_unmap_lsapic(pr->id);
866	return (0);
867}
868#else
869static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
870{
871	return AE_ERROR;
872}
873static int acpi_processor_handle_eject(struct acpi_processor *pr)
874{
875	return (-EINVAL);
876}
877#endif
878
879static
880void acpi_processor_install_hotplug_notify(void)
881{
882#ifdef CONFIG_ACPI_HOTPLUG_CPU
883	int action = INSTALL_NOTIFY_HANDLER;
884	acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
885			    ACPI_ROOT_OBJECT,
886			    ACPI_UINT32_MAX,
887			    processor_walk_namespace_cb, &action, NULL);
888#endif
889}
890
891static
892void acpi_processor_uninstall_hotplug_notify(void)
893{
894#ifdef CONFIG_ACPI_HOTPLUG_CPU
895	int action = UNINSTALL_NOTIFY_HANDLER;
896	acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
897			    ACPI_ROOT_OBJECT,
898			    ACPI_UINT32_MAX,
899			    processor_walk_namespace_cb, &action, NULL);
900#endif
901}
902
903/*
904 * We keep the driver loaded even when ACPI is not running.
905 * This is needed for the powernow-k8 driver, that works even without
906 * ACPI, but needs symbols from this driver
907 */
908
909static int __init acpi_processor_init(void)
910{
911	int result = 0;
912
913	ACPI_FUNCTION_TRACE("acpi_processor_init");
914
915	memset(&processors, 0, sizeof(processors));
916	memset(&errata, 0, sizeof(errata));
917
918	acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
919	if (!acpi_processor_dir)
920		return_VALUE(0);
921	acpi_processor_dir->owner = THIS_MODULE;
922
923	result = acpi_bus_register_driver(&acpi_processor_driver);
924	if (result < 0) {
925		remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
926		return_VALUE(0);
927	}
928
929	acpi_processor_install_hotplug_notify();
930
931	acpi_thermal_cpufreq_init();
932
933	acpi_processor_ppc_init();
934
935	return_VALUE(0);
936}
937
938static void __exit acpi_processor_exit(void)
939{
940	ACPI_FUNCTION_TRACE("acpi_processor_exit");
941
942	acpi_processor_ppc_exit();
943
944	acpi_thermal_cpufreq_exit();
945
946	acpi_processor_uninstall_hotplug_notify();
947
948	acpi_bus_unregister_driver(&acpi_processor_driver);
949
950	remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
951
952	return_VOID;
953}
954
955module_init(acpi_processor_init);
956module_exit(acpi_processor_exit);
957
958EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
959
960MODULE_ALIAS("processor");
961