processor_core.c revision 4fdb2a05ef5703553fdd28f1b96ebdd79f173657 
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
76ACPI_MODULE_NAME("processor_core");
77
78MODULE_AUTHOR("Paul Diefenbaugh");
79MODULE_DESCRIPTION("ACPI Processor Driver");
80MODULE_LICENSE("GPL");
81
82static int acpi_processor_add(struct acpi_device *device);
83static int acpi_processor_start(struct acpi_device *device);
84static int acpi_processor_remove(struct acpi_device *device, int type);
85static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
86static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
87static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
88static int acpi_processor_handle_eject(struct acpi_processor *pr);
89extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
90
91
92static const struct acpi_device_id processor_device_ids[] = {
93	{ACPI_PROCESSOR_HID, 0},
94	{"", 0},
95};
96MODULE_DEVICE_TABLE(acpi, processor_device_ids);
97
98static struct acpi_driver acpi_processor_driver = {
99	.name = "processor",
100	.class = ACPI_PROCESSOR_CLASS,
101	.ids = processor_device_ids,
102	.ops = {
103		.add = acpi_processor_add,
104		.remove = acpi_processor_remove,
105		.start = acpi_processor_start,
106		.suspend = acpi_processor_suspend,
107		.resume = acpi_processor_resume,
108		},
109};
110
111#define INSTALL_NOTIFY_HANDLER		1
112#define UNINSTALL_NOTIFY_HANDLER	2
113
114static const struct file_operations acpi_processor_info_fops = {
115	.open = acpi_processor_info_open_fs,
116	.read = seq_read,
117	.llseek = seq_lseek,
118	.release = single_release,
119};
120
121struct acpi_processor *processors[NR_CPUS];
122struct acpi_processor_errata errata __read_mostly;
123
124/* --------------------------------------------------------------------------
125                                Errata Handling
126   -------------------------------------------------------------------------- */
127
128static 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
229static 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 */
260static int acpi_processor_set_pdc(struct acpi_processor *pr)
261{
262	struct acpi_object_list *pdc_in = pr->pdc;
263	acpi_status status = AE_OK;
264
265
266	if (!pdc_in)
267		return status;
268
269	status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
270
271	if (ACPI_FAILURE(status))
272		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
273		    "Could not evaluate _PDC, using legacy perf. control...\n"));
274
275	return status;
276}
277
278/* --------------------------------------------------------------------------
279                              FS Interface (/proc)
280   -------------------------------------------------------------------------- */
281
282static struct proc_dir_entry *acpi_processor_dir = NULL;
283
284static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
285{
286	struct acpi_processor *pr = seq->private;
287
288
289	if (!pr)
290		goto end;
291
292	seq_printf(seq, "processor id:            %d\n"
293		   "acpi id:                 %d\n"
294		   "bus mastering control:   %s\n"
295		   "power management:        %s\n"
296		   "throttling control:      %s\n"
297		   "limit interface:         %s\n",
298		   pr->id,
299		   pr->acpi_id,
300		   pr->flags.bm_control ? "yes" : "no",
301		   pr->flags.power ? "yes" : "no",
302		   pr->flags.throttling ? "yes" : "no",
303		   pr->flags.limit ? "yes" : "no");
304
305      end:
306	return 0;
307}
308
309static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
310{
311	return single_open(file, acpi_processor_info_seq_show,
312			   PDE(inode)->data);
313}
314
315static int acpi_processor_add_fs(struct acpi_device *device)
316{
317	struct proc_dir_entry *entry = NULL;
318
319
320	if (!acpi_device_dir(device)) {
321		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
322						     acpi_processor_dir);
323		if (!acpi_device_dir(device))
324			return -ENODEV;
325	}
326	acpi_device_dir(device)->owner = THIS_MODULE;
327
328	/* 'info' [R] */
329	entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
330				  S_IRUGO, acpi_device_dir(device));
331	if (!entry)
332		return -EIO;
333	else {
334		entry->proc_fops = &acpi_processor_info_fops;
335		entry->data = acpi_driver_data(device);
336		entry->owner = THIS_MODULE;
337	}
338
339	/* 'throttling' [R/W] */
340	entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
341				  S_IFREG | S_IRUGO | S_IWUSR,
342				  acpi_device_dir(device));
343	if (!entry)
344		return -EIO;
345	else {
346		entry->proc_fops = &acpi_processor_throttling_fops;
347		entry->data = acpi_driver_data(device);
348		entry->owner = THIS_MODULE;
349	}
350
351	/* 'limit' [R/W] */
352	entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
353				  S_IFREG | S_IRUGO | S_IWUSR,
354				  acpi_device_dir(device));
355	if (!entry)
356		return -EIO;
357	else {
358		entry->proc_fops = &acpi_processor_limit_fops;
359		entry->data = acpi_driver_data(device);
360		entry->owner = THIS_MODULE;
361	}
362
363	return 0;
364}
365
366static int acpi_processor_remove_fs(struct acpi_device *device)
367{
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 0;
381}
382
383/* Use the acpiid in MADT to map cpus in case of SMP */
384
385#ifndef CONFIG_SMP
386static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
387#else
388
389static struct acpi_table_madt *madt;
390
391static int map_lapic_id(struct acpi_subtable_header *entry,
392		 u32 acpi_id, int *apic_id)
393{
394	struct acpi_madt_local_apic *lapic =
395		(struct acpi_madt_local_apic *)entry;
396	if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
397	    lapic->processor_id == acpi_id) {
398		*apic_id = lapic->id;
399		return 1;
400	}
401	return 0;
402}
403
404static int map_lsapic_id(struct acpi_subtable_header *entry,
405		  u32 acpi_id, int *apic_id)
406{
407	struct acpi_madt_local_sapic *lsapic =
408		(struct acpi_madt_local_sapic *)entry;
409	/* Only check enabled APICs*/
410	if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
411		/* First check against id */
412		if (lsapic->processor_id == acpi_id) {
413			*apic_id = (lsapic->id << 8) | lsapic->eid;
414			return 1;
415		/* Check against optional uid */
416		} else if (entry->length >= 16 &&
417			lsapic->uid == acpi_id) {
418			*apic_id = lsapic->uid;
419			return 1;
420		}
421	}
422	return 0;
423}
424
425static 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
454static 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
480exit:
481	if (buffer.pointer)
482		kfree(buffer.pointer);
483	return apic_id;
484}
485
486static 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 (cpu_physical_id(i) == apic_id)
499			return i;
500	}
501	return -1;
502}
503#endif
504
505/* --------------------------------------------------------------------------
506                                 Driver Interface
507   -------------------------------------------------------------------------- */
508
509static 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
624static void *processor_device_array[NR_CPUS];
625
626static 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
683static 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_proc_event(device, event,
699					pr->performance_platform_limit);
700		acpi_bus_generate_netlink_event(device->pnp.device_class,
701						  device->dev.bus_id, event,
702						  pr->performance_platform_limit);
703		break;
704	case ACPI_PROCESSOR_NOTIFY_POWER:
705		acpi_processor_cst_has_changed(pr);
706		acpi_bus_generate_proc_event(device, event, 0);
707		acpi_bus_generate_netlink_event(device->pnp.device_class,
708						  device->dev.bus_id, event, 0);
709		break;
710	case ACPI_PROCESSOR_NOTIFY_THROTTLING:
711		acpi_processor_tstate_has_changed(pr);
712		acpi_bus_generate_proc_event(device, event, 0);
713		acpi_bus_generate_netlink_event(device->pnp.device_class,
714						  device->dev.bus_id, event, 0);
715	default:
716		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
717				  "Unsupported event [0x%x]\n", event));
718		break;
719	}
720
721	return;
722}
723
724static int acpi_cpu_soft_notify(struct notifier_block *nfb,
725		unsigned long action, void *hcpu)
726{
727	unsigned int cpu = (unsigned long)hcpu;
728	struct acpi_processor *pr = processors[cpu];
729
730	if (action == CPU_ONLINE && pr) {
731		acpi_processor_ppc_has_changed(pr);
732		acpi_processor_cst_has_changed(pr);
733		acpi_processor_tstate_has_changed(pr);
734	}
735	return NOTIFY_OK;
736}
737
738static struct notifier_block acpi_cpu_notifier =
739{
740	    .notifier_call = acpi_cpu_soft_notify,
741};
742
743static int acpi_processor_add(struct acpi_device *device)
744{
745	struct acpi_processor *pr = NULL;
746
747
748	if (!device)
749		return -EINVAL;
750
751	pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
752	if (!pr)
753		return -ENOMEM;
754
755	pr->handle = device->handle;
756	strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
757	strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
758	acpi_driver_data(device) = pr;
759
760	return 0;
761}
762
763static int acpi_processor_remove(struct acpi_device *device, int type)
764{
765	acpi_status status = AE_OK;
766	struct acpi_processor *pr = NULL;
767
768
769	if (!device || !acpi_driver_data(device))
770		return -EINVAL;
771
772	pr = acpi_driver_data(device);
773
774	if (pr->id >= NR_CPUS) {
775		kfree(pr);
776		return 0;
777	}
778
779	if (type == ACPI_BUS_REMOVAL_EJECT) {
780		if (acpi_processor_handle_eject(pr))
781			return -EINVAL;
782	}
783
784	acpi_processor_power_exit(pr, device);
785
786	status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
787					    acpi_processor_notify);
788
789	acpi_processor_remove_fs(device);
790
791	processors[pr->id] = NULL;
792
793	kfree(pr);
794
795	return 0;
796}
797
798#ifdef CONFIG_ACPI_HOTPLUG_CPU
799/****************************************************************************
800 * 	Acpi processor hotplug support 				       	    *
801 ****************************************************************************/
802
803static int is_processor_present(acpi_handle handle);
804
805static int is_processor_present(acpi_handle handle)
806{
807	acpi_status status;
808	unsigned long sta = 0;
809
810
811	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
812	if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
813		ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
814		return 0;
815	}
816	return 1;
817}
818
819static
820int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
821{
822	acpi_handle phandle;
823	struct acpi_device *pdev;
824	struct acpi_processor *pr;
825
826
827	if (acpi_get_parent(handle, &phandle)) {
828		return -ENODEV;
829	}
830
831	if (acpi_bus_get_device(phandle, &pdev)) {
832		return -ENODEV;
833	}
834
835	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
836		return -ENODEV;
837	}
838
839	acpi_bus_start(*device);
840
841	pr = acpi_driver_data(*device);
842	if (!pr)
843		return -ENODEV;
844
845	if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
846		kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
847	}
848	return 0;
849}
850
851static void
852acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
853{
854	struct acpi_processor *pr;
855	struct acpi_device *device = NULL;
856	int result;
857
858
859	switch (event) {
860	case ACPI_NOTIFY_BUS_CHECK:
861	case ACPI_NOTIFY_DEVICE_CHECK:
862		printk("Processor driver received %s event\n",
863		       (event == ACPI_NOTIFY_BUS_CHECK) ?
864		       "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
865
866		if (!is_processor_present(handle))
867			break;
868
869		if (acpi_bus_get_device(handle, &device)) {
870			result = acpi_processor_device_add(handle, &device);
871			if (result)
872				printk(KERN_ERR PREFIX
873					    "Unable to add the device\n");
874			break;
875		}
876
877		pr = acpi_driver_data(device);
878		if (!pr) {
879			printk(KERN_ERR PREFIX "Driver data is NULL\n");
880			break;
881		}
882
883		if (pr->id >= 0 && (pr->id < NR_CPUS)) {
884			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
885			break;
886		}
887
888		result = acpi_processor_start(device);
889		if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
890			kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
891		} else {
892			printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
893				    acpi_device_bid(device));
894		}
895		break;
896	case ACPI_NOTIFY_EJECT_REQUEST:
897		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
898				  "received ACPI_NOTIFY_EJECT_REQUEST\n"));
899
900		if (acpi_bus_get_device(handle, &device)) {
901			printk(KERN_ERR PREFIX
902				    "Device don't exist, dropping EJECT\n");
903			break;
904		}
905		pr = acpi_driver_data(device);
906		if (!pr) {
907			printk(KERN_ERR PREFIX
908				    "Driver data is NULL, dropping EJECT\n");
909			return;
910		}
911
912		if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
913			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
914		break;
915	default:
916		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
917				  "Unsupported event [0x%x]\n", event));
918		break;
919	}
920
921	return;
922}
923
924static acpi_status
925processor_walk_namespace_cb(acpi_handle handle,
926			    u32 lvl, void *context, void **rv)
927{
928	acpi_status status;
929	int *action = context;
930	acpi_object_type type = 0;
931
932	status = acpi_get_type(handle, &type);
933	if (ACPI_FAILURE(status))
934		return (AE_OK);
935
936	if (type != ACPI_TYPE_PROCESSOR)
937		return (AE_OK);
938
939	switch (*action) {
940	case INSTALL_NOTIFY_HANDLER:
941		acpi_install_notify_handler(handle,
942					    ACPI_SYSTEM_NOTIFY,
943					    acpi_processor_hotplug_notify,
944					    NULL);
945		break;
946	case UNINSTALL_NOTIFY_HANDLER:
947		acpi_remove_notify_handler(handle,
948					   ACPI_SYSTEM_NOTIFY,
949					   acpi_processor_hotplug_notify);
950		break;
951	default:
952		break;
953	}
954
955	return (AE_OK);
956}
957
958static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
959{
960
961	if (!is_processor_present(handle)) {
962		return AE_ERROR;
963	}
964
965	if (acpi_map_lsapic(handle, p_cpu))
966		return AE_ERROR;
967
968	if (arch_register_cpu(*p_cpu)) {
969		acpi_unmap_lsapic(*p_cpu);
970		return AE_ERROR;
971	}
972
973	return AE_OK;
974}
975
976static int acpi_processor_handle_eject(struct acpi_processor *pr)
977{
978	if (cpu_online(pr->id)) {
979		return (-EINVAL);
980	}
981	arch_unregister_cpu(pr->id);
982	acpi_unmap_lsapic(pr->id);
983	return (0);
984}
985#else
986static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
987{
988	return AE_ERROR;
989}
990static int acpi_processor_handle_eject(struct acpi_processor *pr)
991{
992	return (-EINVAL);
993}
994#endif
995
996static
997void acpi_processor_install_hotplug_notify(void)
998{
999#ifdef CONFIG_ACPI_HOTPLUG_CPU
1000	int action = INSTALL_NOTIFY_HANDLER;
1001	acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1002			    ACPI_ROOT_OBJECT,
1003			    ACPI_UINT32_MAX,
1004			    processor_walk_namespace_cb, &action, NULL);
1005#endif
1006	register_hotcpu_notifier(&acpi_cpu_notifier);
1007}
1008
1009static
1010void acpi_processor_uninstall_hotplug_notify(void)
1011{
1012#ifdef CONFIG_ACPI_HOTPLUG_CPU
1013	int action = UNINSTALL_NOTIFY_HANDLER;
1014	acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1015			    ACPI_ROOT_OBJECT,
1016			    ACPI_UINT32_MAX,
1017			    processor_walk_namespace_cb, &action, NULL);
1018#endif
1019	unregister_hotcpu_notifier(&acpi_cpu_notifier);
1020}
1021
1022/*
1023 * We keep the driver loaded even when ACPI is not running.
1024 * This is needed for the powernow-k8 driver, that works even without
1025 * ACPI, but needs symbols from this driver
1026 */
1027
1028static int __init acpi_processor_init(void)
1029{
1030	int result = 0;
1031
1032
1033	memset(&processors, 0, sizeof(processors));
1034	memset(&errata, 0, sizeof(errata));
1035
1036#ifdef CONFIG_SMP
1037	if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1038				(struct acpi_table_header **)&madt)))
1039		madt = NULL;
1040#endif
1041
1042	acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1043	if (!acpi_processor_dir)
1044		return -ENOMEM;
1045	acpi_processor_dir->owner = THIS_MODULE;
1046
1047	result = cpuidle_register_driver(&acpi_idle_driver);
1048	if (result < 0)
1049		goto out_proc;
1050
1051	result = acpi_bus_register_driver(&acpi_processor_driver);
1052	if (result < 0)
1053		goto out_cpuidle;
1054
1055	acpi_processor_install_hotplug_notify();
1056
1057	acpi_thermal_cpufreq_init();
1058
1059	acpi_processor_ppc_init();
1060
1061	return 0;
1062
1063out_cpuidle:
1064	cpuidle_unregister_driver(&acpi_idle_driver);
1065
1066out_proc:
1067	remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1068
1069	return result;
1070}
1071
1072static void __exit acpi_processor_exit(void)
1073{
1074	acpi_processor_ppc_exit();
1075
1076	acpi_thermal_cpufreq_exit();
1077
1078	acpi_processor_uninstall_hotplug_notify();
1079
1080	acpi_bus_unregister_driver(&acpi_processor_driver);
1081
1082	cpuidle_unregister_driver(&acpi_idle_driver);
1083
1084	remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1085
1086	return;
1087}
1088
1089module_init(acpi_processor_init);
1090module_exit(acpi_processor_exit);
1091
1092EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1093
1094MODULE_ALIAS("processor");
1095