ia64/linux-2.6.18-xen.hg

view drivers/acpi/processor_core.c @ 531:3c564f80f2ef

Notify ACPI processor events to external logic, including C/P/T and hotplug, etc.

Signed-off-by: Tian Kevin <kevin.tian@intel.com>
Signed-off-by: Wei Gang <gang.wei@intel.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu May 01 10:52:31 2008 +0100 (2008-05-01)
parents 831230e53067
children d62d60eaba6e
line source
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 */
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>
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>
57 #include <acpi/acpi_bus.h>
58 #include <acpi/acpi_drivers.h>
59 #include <acpi/processor.h>
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
71 #define ACPI_PROCESSOR_LIMIT_USER 0
72 #define ACPI_PROCESSOR_LIMIT_THERMAL 1
74 #define ACPI_STA_PRESENT 0x00000001
76 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
77 ACPI_MODULE_NAME("acpi_processor")
79 MODULE_AUTHOR("Paul Diefenbaugh");
80 MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
81 MODULE_LICENSE("GPL");
83 static int acpi_processor_add(struct acpi_device *device);
84 static int acpi_processor_start(struct acpi_device *device);
85 static int acpi_processor_remove(struct acpi_device *device, int type);
86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
87 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
88 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
89 static int acpi_processor_handle_eject(struct acpi_processor *pr);
91 static 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 };
102 #define INSTALL_NOTIFY_HANDLER 1
103 #define UNINSTALL_NOTIFY_HANDLER 2
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 };
112 struct acpi_processor *processors[NR_CPUS];
113 struct acpi_processor_errata errata __read_mostly;
115 /* --------------------------------------------------------------------------
116 Errata Handling
117 -------------------------------------------------------------------------- */
119 static int acpi_processor_errata_piix4(struct pci_dev *dev)
120 {
121 u8 rev = 0;
122 u8 value1 = 0;
123 u8 value2 = 0;
126 if (!dev)
127 return -EINVAL;
129 /*
130 * Note that 'dev' references the PIIX4 ACPI Controller.
131 */
133 pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
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 }
153 switch (rev) {
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;
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 */
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 }
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 }
210 break;
211 }
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"));
220 return 0;
221 }
223 static int acpi_processor_errata(struct acpi_processor *pr)
224 {
225 int result = 0;
226 struct pci_dev *dev = NULL;
229 if (!pr)
230 return -EINVAL;
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 }
243 return result;
244 }
246 /* --------------------------------------------------------------------------
247 Common ACPI processor functions
248 -------------------------------------------------------------------------- */
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;
260 if (!pdc_in)
261 return status;
263 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
265 if (ACPI_FAILURE(status))
266 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
267 "Could not evaluate _PDC, using legacy perf. control...\n"));
269 return status;
270 }
272 /* --------------------------------------------------------------------------
273 FS Interface (/proc)
274 -------------------------------------------------------------------------- */
276 static struct proc_dir_entry *acpi_processor_dir = NULL;
278 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
279 {
280 struct acpi_processor *pr = (struct acpi_processor *)seq->private;
283 if (!pr)
284 goto end;
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");
299 end:
300 return 0;
301 }
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 }
309 static int acpi_processor_add_fs(struct acpi_device *device)
310 {
311 struct proc_dir_entry *entry = NULL;
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;
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 }
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 }
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 }
357 return 0;
358 }
360 static int acpi_processor_remove_fs(struct acpi_device *device)
361 {
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 }
374 return 0;
375 }
377 /* Use the acpiid in MADT to map cpus in case of SMP */
378 #ifndef CONFIG_SMP
379 #define convert_acpiid_to_cpu(acpi_id) (-1)
380 #else
382 #ifdef CONFIG_IA64
383 #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid
384 #define arch_cpu_to_apicid ia64_cpu_to_sapicid
385 #define ARCH_BAD_APICID (0xffff)
386 #else
387 #define arch_acpiid_to_apicid x86_acpiid_to_apicid
388 #define arch_cpu_to_apicid x86_cpu_to_apicid
389 #define ARCH_BAD_APICID (0xff)
390 #endif
392 static int convert_acpiid_to_cpu(u8 acpi_id)
393 {
394 u16 apic_id;
395 int i;
397 apic_id = arch_acpiid_to_apicid[acpi_id];
398 if (apic_id == ARCH_BAD_APICID)
399 return -1;
401 for (i = 0; i < NR_CPUS; i++) {
402 if (arch_cpu_to_apicid[i] == apic_id)
403 return i;
404 }
405 return -1;
406 }
407 #endif
409 /* --------------------------------------------------------------------------
410 Driver Interface
411 -------------------------------------------------------------------------- */
413 static int acpi_processor_get_info(struct acpi_processor *pr)
414 {
415 acpi_status status = 0;
416 union acpi_object object = { 0 };
417 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
418 int cpu_index;
419 static int cpu0_initialized;
422 if (!pr)
423 return -EINVAL;
425 if (num_online_cpus() > 1)
426 errata.smp = TRUE;
428 acpi_processor_errata(pr);
430 /*
431 * Check to see if we have bus mastering arbitration control. This
432 * is required for proper C3 usage (to maintain cache coherency).
433 */
434 if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
435 pr->flags.bm_control = 1;
436 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
437 "Bus mastering arbitration control present\n"));
438 } else
439 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
440 "No bus mastering arbitration control\n"));
442 /*
443 * Evalute the processor object. Note that it is common on SMP to
444 * have the first (boot) processor with a valid PBLK address while
445 * all others have a NULL address.
446 */
447 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
448 if (ACPI_FAILURE(status)) {
449 printk(KERN_ERR PREFIX "Evaluating processor object\n");
450 return -ENODEV;
451 }
453 /*
454 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
455 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
456 */
457 pr->acpi_id = object.processor.proc_id;
459 cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
461 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
462 if (!cpu0_initialized && (cpu_index == -1) &&
463 (num_online_cpus() == 1)) {
464 cpu_index = 0;
465 }
467 cpu0_initialized = 1;
469 pr->id = cpu_index;
471 /*
472 * Extra Processor objects may be enumerated on MP systems with
473 * less than the max # of CPUs. They should be ignored _iff
474 * they are physically not present.
475 */
476 if (cpu_index == -1) {
477 if (ACPI_FAILURE
478 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
479 printk(KERN_ERR PREFIX
480 "Getting cpuindex for acpiid 0x%x\n",
481 pr->acpi_id);
482 return -ENODEV;
483 }
484 }
486 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
487 pr->acpi_id));
489 if (!object.processor.pblk_address)
490 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
491 else if (object.processor.pblk_length != 6)
492 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
493 object.processor.pblk_length);
494 else {
495 pr->throttling.address = object.processor.pblk_address;
496 pr->throttling.duty_offset = acpi_fadt.duty_offset;
497 pr->throttling.duty_width = acpi_fadt.duty_width;
499 pr->pblk = object.processor.pblk_address;
501 /*
502 * We don't care about error returns - we just try to mark
503 * these reserved so that nobody else is confused into thinking
504 * that this region might be unused..
505 *
506 * (In particular, allocating the IO range for Cardbus)
507 */
508 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
509 }
511 #ifdef CONFIG_CPU_FREQ
512 acpi_processor_ppc_has_changed(pr);
513 #endif
514 acpi_processor_get_throttling_info(pr);
515 acpi_processor_get_limit_info(pr);
517 return 0;
518 }
520 static void *processor_device_array[NR_CPUS];
522 static int acpi_processor_start(struct acpi_device *device)
523 {
524 int result = 0;
525 acpi_status status = AE_OK;
526 struct acpi_processor *pr;
529 pr = acpi_driver_data(device);
531 result = acpi_processor_get_info(pr);
532 if (result) {
533 /* Processor is physically not present */
534 return 0;
535 }
537 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
539 /*
540 * Buggy BIOS check
541 * ACPI id of processors can be reported wrongly by the BIOS.
542 * Don't trust it blindly
543 */
544 if (processor_device_array[pr->id] != NULL &&
545 processor_device_array[pr->id] != (void *)device) {
546 printk(KERN_WARNING "BIOS reported wrong ACPI id"
547 "for the processor\n");
548 return -ENODEV;
549 }
550 processor_device_array[pr->id] = (void *)device;
552 processors[pr->id] = pr;
554 result = acpi_processor_add_fs(device);
555 if (result)
556 goto end;
558 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
559 acpi_processor_notify, pr);
561 /* _PDC call should be done before doing anything else (if reqd.). */
562 arch_acpi_processor_init_pdc(pr);
563 acpi_processor_set_pdc(pr);
565 acpi_processor_power_init(pr, device);
567 #ifdef CONFIG_PROCESSOR_EXTERNAL_CONTROL
568 processor_extcntl_init(pr);
569 #endif
571 if (pr->flags.throttling) {
572 printk(KERN_INFO PREFIX "%s [%s] (supports",
573 acpi_device_name(device), acpi_device_bid(device));
574 printk(" %d throttling states", pr->throttling.state_count);
575 printk(")\n");
576 }
578 end:
580 return result;
581 }
583 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
584 {
585 struct acpi_processor *pr = (struct acpi_processor *)data;
586 struct acpi_device *device = NULL;
589 if (!pr)
590 return;
592 if (acpi_bus_get_device(pr->handle, &device))
593 return;
595 switch (event) {
596 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
597 acpi_processor_ppc_has_changed(pr);
598 acpi_bus_generate_event(device, event,
599 pr->performance_platform_limit);
600 break;
601 case ACPI_PROCESSOR_NOTIFY_POWER:
602 acpi_processor_cst_has_changed(pr);
603 acpi_bus_generate_event(device, event, 0);
604 break;
605 default:
606 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
607 "Unsupported event [0x%x]\n", event));
608 break;
609 }
611 return;
612 }
614 static int acpi_processor_add(struct acpi_device *device)
615 {
616 struct acpi_processor *pr = NULL;
619 if (!device)
620 return -EINVAL;
622 pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
623 if (!pr)
624 return -ENOMEM;
625 memset(pr, 0, sizeof(struct acpi_processor));
627 pr->handle = device->handle;
628 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
629 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
630 acpi_driver_data(device) = pr;
632 return 0;
633 }
635 static int acpi_processor_remove(struct acpi_device *device, int type)
636 {
637 acpi_status status = AE_OK;
638 struct acpi_processor *pr = NULL;
641 if (!device || !acpi_driver_data(device))
642 return -EINVAL;
644 pr = (struct acpi_processor *)acpi_driver_data(device);
646 if (pr->id >= NR_CPUS) {
647 kfree(pr);
648 return 0;
649 }
651 if (type == ACPI_BUS_REMOVAL_EJECT) {
652 if (acpi_processor_handle_eject(pr))
653 return -EINVAL;
654 }
656 acpi_processor_power_exit(pr, device);
658 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
659 acpi_processor_notify);
661 acpi_processor_remove_fs(device);
663 processors[pr->id] = NULL;
665 kfree(pr);
667 return 0;
668 }
670 #ifdef CONFIG_ACPI_HOTPLUG_CPU
671 /****************************************************************************
672 * Acpi processor hotplug support *
673 ****************************************************************************/
675 static int is_processor_present(acpi_handle handle);
677 static int is_processor_present(acpi_handle handle)
678 {
679 acpi_status status;
680 unsigned long sta = 0;
683 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
684 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
685 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
686 return 0;
687 }
688 return 1;
689 }
691 static
692 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
693 {
694 acpi_handle phandle;
695 struct acpi_device *pdev;
696 struct acpi_processor *pr;
699 if (acpi_get_parent(handle, &phandle)) {
700 return -ENODEV;
701 }
703 if (acpi_bus_get_device(phandle, &pdev)) {
704 return -ENODEV;
705 }
707 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
708 return -ENODEV;
709 }
711 acpi_bus_start(*device);
713 pr = acpi_driver_data(*device);
714 if (!pr)
715 return -ENODEV;
717 if (processor_cntl_external())
718 processor_notify_external(pr,
719 PROCESSOR_HOTPLUG, HOTPLUG_TYPE_ADD);
721 if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
722 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
723 }
724 return 0;
725 }
727 static void
728 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
729 {
730 struct acpi_processor *pr;
731 struct acpi_device *device = NULL;
732 int result;
735 switch (event) {
736 case ACPI_NOTIFY_BUS_CHECK:
737 case ACPI_NOTIFY_DEVICE_CHECK:
738 printk("Processor driver received %s event\n",
739 (event == ACPI_NOTIFY_BUS_CHECK) ?
740 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
742 if (!is_processor_present(handle))
743 break;
745 if (acpi_bus_get_device(handle, &device)) {
746 result = acpi_processor_device_add(handle, &device);
747 if (result)
748 printk(KERN_ERR PREFIX
749 "Unable to add the device\n");
750 break;
751 }
753 pr = acpi_driver_data(device);
754 if (!pr) {
755 printk(KERN_ERR PREFIX "Driver data is NULL\n");
756 break;
757 }
759 if (processor_cntl_external())
760 processor_notify_external(pr,
761 PROCESSOR_HOTPLUG, HOTPLUG_TYPE_ADD);
763 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
764 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
765 break;
766 }
768 result = acpi_processor_start(device);
769 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
770 kobject_uevent(&device->kobj, KOBJ_ONLINE);
771 } else {
772 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
773 acpi_device_bid(device));
774 }
775 break;
776 case ACPI_NOTIFY_EJECT_REQUEST:
777 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
778 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
780 if (acpi_bus_get_device(handle, &device)) {
781 printk(KERN_ERR PREFIX
782 "Device don't exist, dropping EJECT\n");
783 break;
784 }
785 pr = acpi_driver_data(device);
786 if (!pr) {
787 printk(KERN_ERR PREFIX
788 "Driver data is NULL, dropping EJECT\n");
789 return;
790 }
792 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
793 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
795 if (processor_cntl_external())
796 processor_notify_external(pr, PROCESSOR_HOTPLUG,
797 HOTPLUG_TYPE_REMOVE);
799 break;
800 default:
801 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
802 "Unsupported event [0x%x]\n", event));
803 break;
804 }
806 return;
807 }
809 static acpi_status
810 processor_walk_namespace_cb(acpi_handle handle,
811 u32 lvl, void *context, void **rv)
812 {
813 acpi_status status;
814 int *action = context;
815 acpi_object_type type = 0;
817 status = acpi_get_type(handle, &type);
818 if (ACPI_FAILURE(status))
819 return (AE_OK);
821 if (type != ACPI_TYPE_PROCESSOR)
822 return (AE_OK);
824 switch (*action) {
825 case INSTALL_NOTIFY_HANDLER:
826 acpi_install_notify_handler(handle,
827 ACPI_SYSTEM_NOTIFY,
828 acpi_processor_hotplug_notify,
829 NULL);
830 break;
831 case UNINSTALL_NOTIFY_HANDLER:
832 acpi_remove_notify_handler(handle,
833 ACPI_SYSTEM_NOTIFY,
834 acpi_processor_hotplug_notify);
835 break;
836 default:
837 break;
838 }
840 return (AE_OK);
841 }
843 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
844 {
846 if (!is_processor_present(handle)) {
847 return AE_ERROR;
848 }
850 if (acpi_map_lsapic(handle, p_cpu))
851 return AE_ERROR;
853 if (arch_register_cpu(*p_cpu)) {
854 acpi_unmap_lsapic(*p_cpu);
855 return AE_ERROR;
856 }
858 return AE_OK;
859 }
861 static int acpi_processor_handle_eject(struct acpi_processor *pr)
862 {
863 if (cpu_online(pr->id)) {
864 return (-EINVAL);
865 }
866 arch_unregister_cpu(pr->id);
867 acpi_unmap_lsapic(pr->id);
868 return (0);
869 }
870 #else
871 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
872 {
873 return AE_ERROR;
874 }
875 static int acpi_processor_handle_eject(struct acpi_processor *pr)
876 {
877 return (-EINVAL);
878 }
879 #endif
881 static
882 void acpi_processor_install_hotplug_notify(void)
883 {
884 #ifdef CONFIG_ACPI_HOTPLUG_CPU
885 int action = INSTALL_NOTIFY_HANDLER;
886 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
887 ACPI_ROOT_OBJECT,
888 ACPI_UINT32_MAX,
889 processor_walk_namespace_cb, &action, NULL);
890 #endif
891 }
893 static
894 void acpi_processor_uninstall_hotplug_notify(void)
895 {
896 #ifdef CONFIG_ACPI_HOTPLUG_CPU
897 int action = UNINSTALL_NOTIFY_HANDLER;
898 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
899 ACPI_ROOT_OBJECT,
900 ACPI_UINT32_MAX,
901 processor_walk_namespace_cb, &action, NULL);
902 #endif
903 }
905 /*
906 * We keep the driver loaded even when ACPI is not running.
907 * This is needed for the powernow-k8 driver, that works even without
908 * ACPI, but needs symbols from this driver
909 */
911 static int __init acpi_processor_init(void)
912 {
913 int result = 0;
916 memset(&processors, 0, sizeof(processors));
917 memset(&errata, 0, sizeof(errata));
919 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
920 if (!acpi_processor_dir)
921 return 0;
922 acpi_processor_dir->owner = THIS_MODULE;
924 result = acpi_bus_register_driver(&acpi_processor_driver);
925 if (result < 0) {
926 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
927 return 0;
928 }
930 acpi_processor_install_hotplug_notify();
932 acpi_thermal_cpufreq_init();
934 acpi_processor_ppc_init();
936 return 0;
937 }
939 static void __exit acpi_processor_exit(void)
940 {
942 acpi_processor_ppc_exit();
944 acpi_thermal_cpufreq_exit();
946 acpi_processor_uninstall_hotplug_notify();
948 acpi_bus_unregister_driver(&acpi_processor_driver);
950 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
952 return;
953 }
955 module_init(acpi_processor_init);
956 module_exit(acpi_processor_exit);
958 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
960 MODULE_ALIAS("processor");