ia64/linux-2.6.18-xen.hg

view drivers/acpi/processor_core.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents c86e5fde3fb1
children
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
70 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
72 #define ACPI_PROCESSOR_LIMIT_USER 0
73 #define ACPI_PROCESSOR_LIMIT_THERMAL 1
75 #define ACPI_STA_PRESENT 0x00000001
77 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
78 ACPI_MODULE_NAME("acpi_processor")
80 MODULE_AUTHOR("Paul Diefenbaugh");
81 MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
82 MODULE_LICENSE("GPL");
84 static int acpi_processor_add(struct acpi_device *device);
85 static int acpi_processor_start(struct acpi_device *device);
86 static int acpi_processor_remove(struct acpi_device *device, int type);
87 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
88 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
89 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
90 static int acpi_processor_handle_eject(struct acpi_processor *pr);
92 static struct acpi_driver acpi_processor_driver = {
93 .name = ACPI_PROCESSOR_DRIVER_NAME,
94 .class = ACPI_PROCESSOR_CLASS,
95 .ids = ACPI_PROCESSOR_HID,
96 .ops = {
97 .add = acpi_processor_add,
98 .remove = acpi_processor_remove,
99 .start = acpi_processor_start,
100 },
101 };
103 #define INSTALL_NOTIFY_HANDLER 1
104 #define UNINSTALL_NOTIFY_HANDLER 2
106 static const struct file_operations acpi_processor_info_fops = {
107 .open = acpi_processor_info_open_fs,
108 .read = seq_read,
109 .llseek = seq_lseek,
110 .release = single_release,
111 };
113 struct acpi_processor *processors[NR_CPUS];
114 struct acpi_processor_errata errata __read_mostly;
116 /* --------------------------------------------------------------------------
117 Errata Handling
118 -------------------------------------------------------------------------- */
120 static int acpi_processor_errata_piix4(struct pci_dev *dev)
121 {
122 u8 rev = 0;
123 u8 value1 = 0;
124 u8 value2 = 0;
127 if (!dev)
128 return -EINVAL;
130 /*
131 * Note that 'dev' references the PIIX4 ACPI Controller.
132 */
134 pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
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 }
154 switch (rev) {
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;
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 */
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 }
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 }
211 break;
212 }
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"));
221 return 0;
222 }
224 static int acpi_processor_errata(struct acpi_processor *pr)
225 {
226 int result = 0;
227 struct pci_dev *dev = NULL;
230 if (!pr)
231 return -EINVAL;
233 /*
234 * PIIX4
235 */
236 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
237 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
238 PCI_ANY_ID, NULL);
239 if (dev) {
240 result = acpi_processor_errata_piix4(dev);
241 pci_dev_put(dev);
242 }
244 return result;
245 }
247 /* --------------------------------------------------------------------------
248 Common ACPI processor functions
249 -------------------------------------------------------------------------- */
251 /*
252 * _PDC is required for a BIOS-OS handshake for most of the newer
253 * ACPI processor features.
254 */
255 static int acpi_processor_set_pdc(struct acpi_processor *pr)
256 {
257 struct acpi_object_list *pdc_in = pr->pdc;
258 acpi_status status = AE_OK;
261 if (!pdc_in)
262 return status;
264 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
266 if (ACPI_FAILURE(status))
267 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
268 "Could not evaluate _PDC, using legacy perf. control...\n"));
270 return status;
271 }
273 /* --------------------------------------------------------------------------
274 FS Interface (/proc)
275 -------------------------------------------------------------------------- */
277 static struct proc_dir_entry *acpi_processor_dir = NULL;
279 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
280 {
281 struct acpi_processor *pr = (struct acpi_processor *)seq->private;
284 if (!pr)
285 goto end;
287 seq_printf(seq, "processor id: %d\n"
288 "acpi id: %d\n"
289 "bus mastering control: %s\n"
290 "power management: %s\n"
291 "throttling control: %s\n"
292 "limit interface: %s\n",
293 pr->id,
294 pr->acpi_id,
295 pr->flags.bm_control ? "yes" : "no",
296 pr->flags.power ? "yes" : "no",
297 pr->flags.throttling ? "yes" : "no",
298 pr->flags.limit ? "yes" : "no");
300 end:
301 return 0;
302 }
304 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
305 {
306 return single_open(file, acpi_processor_info_seq_show,
307 PDE(inode)->data);
308 }
310 static int acpi_processor_add_fs(struct acpi_device *device)
311 {
312 struct proc_dir_entry *entry = NULL;
315 if (!acpi_device_dir(device)) {
316 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
317 acpi_processor_dir);
318 if (!acpi_device_dir(device))
319 return -ENODEV;
320 }
321 acpi_device_dir(device)->owner = THIS_MODULE;
323 /* 'info' [R] */
324 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
325 S_IRUGO, acpi_device_dir(device));
326 if (!entry)
327 return -EIO;
328 else {
329 entry->proc_fops = &acpi_processor_info_fops;
330 entry->data = acpi_driver_data(device);
331 entry->owner = THIS_MODULE;
332 }
334 /* 'throttling' [R/W] */
335 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
336 S_IFREG | S_IRUGO | S_IWUSR,
337 acpi_device_dir(device));
338 if (!entry)
339 return -EIO;
340 else {
341 entry->proc_fops = &acpi_processor_throttling_fops;
342 entry->data = acpi_driver_data(device);
343 entry->owner = THIS_MODULE;
344 }
346 /* 'limit' [R/W] */
347 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
348 S_IFREG | S_IRUGO | S_IWUSR,
349 acpi_device_dir(device));
350 if (!entry)
351 return -EIO;
352 else {
353 entry->proc_fops = &acpi_processor_limit_fops;
354 entry->data = acpi_driver_data(device);
355 entry->owner = THIS_MODULE;
356 }
358 return 0;
359 }
361 static int acpi_processor_remove_fs(struct acpi_device *device)
362 {
364 if (acpi_device_dir(device)) {
365 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
366 acpi_device_dir(device));
367 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
368 acpi_device_dir(device));
369 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
370 acpi_device_dir(device));
371 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
372 acpi_device_dir(device) = NULL;
373 }
375 return 0;
376 }
378 /* Use the acpiid in MADT to map cpus in case of SMP */
379 #ifndef CONFIG_SMP
380 #define convert_acpiid_to_cpu(acpi_id) (-1)
381 #else
383 #ifdef CONFIG_IA64
384 #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid
385 #define arch_cpu_to_apicid ia64_cpu_to_sapicid
386 #define ARCH_BAD_APICID (0xffff)
387 #else
388 #define arch_acpiid_to_apicid x86_acpiid_to_apicid
389 #define arch_cpu_to_apicid x86_cpu_to_apicid
390 #define ARCH_BAD_APICID (0xff)
391 #endif
393 static int convert_acpiid_to_cpu(u8 acpi_id)
394 {
395 u16 apic_id;
396 int i;
398 apic_id = arch_acpiid_to_apicid[acpi_id];
399 if (apic_id == ARCH_BAD_APICID)
400 return -1;
402 for (i = 0; i < NR_CPUS; i++) {
403 if (arch_cpu_to_apicid[i] == apic_id)
404 return i;
405 }
406 return -1;
407 }
408 #endif
410 /* --------------------------------------------------------------------------
411 Driver Interface
412 -------------------------------------------------------------------------- */
414 static int acpi_processor_get_info(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 int cpu_index;
420 static int cpu0_initialized;
423 if (!pr)
424 return -EINVAL;
426 if (num_online_cpus() > 1)
427 errata.smp = TRUE;
429 acpi_processor_errata(pr);
431 /*
432 * Check to see if we have bus mastering arbitration control. This
433 * is required for proper C3 usage (to maintain cache coherency).
434 */
435 if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
436 pr->flags.bm_control = 1;
437 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
438 "Bus mastering arbitration control present\n"));
439 } else
440 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
441 "No bus mastering arbitration control\n"));
443 /*
444 * Evalute the processor object. Note that it is common on SMP to
445 * have the first (boot) processor with a valid PBLK address while
446 * all others have a NULL address.
447 */
448 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
449 if (ACPI_FAILURE(status)) {
450 printk(KERN_ERR PREFIX "Evaluating processor object\n");
451 return -ENODEV;
452 }
454 /*
455 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
456 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
457 */
458 pr->acpi_id = object.processor.proc_id;
460 cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
462 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
463 if (!cpu0_initialized && (cpu_index == -1) &&
464 (num_online_cpus() == 1)) {
465 cpu_index = 0;
466 }
468 cpu0_initialized = 1;
470 pr->id = cpu_index;
472 /*
473 * Extra Processor objects may be enumerated on MP systems with
474 * less than the max # of CPUs. They should be ignored _iff
475 * they are physically not present.
476 */
477 if (cpu_index == -1) {
478 if (ACPI_FAILURE
479 (acpi_processor_hotadd_init(pr->handle, &pr->id)) &&
480 !processor_cntl_external()) {
481 printk(KERN_ERR PREFIX
482 "Getting cpuindex for acpiid 0x%x\n",
483 pr->acpi_id);
484 return -ENODEV;
485 }
486 }
488 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
489 pr->acpi_id));
491 if (!object.processor.pblk_address)
492 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
493 else if (object.processor.pblk_length != 6)
494 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
495 object.processor.pblk_length);
496 else {
497 pr->throttling.address = object.processor.pblk_address;
498 pr->throttling.duty_offset = acpi_fadt.duty_offset;
499 pr->throttling.duty_width = acpi_fadt.duty_width;
501 pr->pblk = object.processor.pblk_address;
503 /*
504 * We don't care about error returns - we just try to mark
505 * these reserved so that nobody else is confused into thinking
506 * that this region might be unused..
507 *
508 * (In particular, allocating the IO range for Cardbus)
509 */
510 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
511 }
513 return 0;
514 }
516 static void *processor_device_array[NR_ACPI_CPUS];
518 static int acpi_processor_start(struct acpi_device *device)
519 {
520 int result = 0;
521 acpi_status status = AE_OK;
522 struct acpi_processor *pr;
524 processor_extcntl_init();
526 pr = acpi_driver_data(device);
528 result = acpi_processor_get_info(pr);
529 if (result ||
530 ((pr->id == -1) && !processor_cntl_external())) {
531 /* Processor is physically not present */
532 return 0;
533 }
535 BUG_ON(!processor_cntl_external() &&
536 ((pr->id >= NR_CPUS) || (pr->id < 0)));
538 /*
539 * Buggy BIOS check
540 * ACPI id of processors can be reported wrongly by the BIOS.
541 * Don't trust it blindly
542 */
543 #ifdef CONFIG_XEN
544 BUG_ON(pr->acpi_id >= NR_ACPI_CPUS);
545 if (processor_device_array[pr->acpi_id] != NULL &&
546 processor_device_array[pr->acpi_id] != (void *)device) {
547 #else
548 if (processor_device_array[pr->id] != NULL &&
549 processor_device_array[pr->id] != (void *)device) {
550 #endif /* CONFIG_XEN */
551 printk(KERN_WARNING "BIOS reported wrong ACPI id"
552 "for the processor\n");
553 return -ENODEV;
554 }
555 #ifdef CONFIG_XEN
556 processor_device_array[pr->acpi_id] = (void *)device;
557 if (pr->id != -1)
558 processors[pr->id] = pr;
559 #else
560 processor_device_array[pr->id] = (void *)device;
562 processors[pr->id] = pr;
563 #endif /* CONFIG_XEN */
565 result = acpi_processor_add_fs(device);
566 if (result)
567 goto end;
569 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
570 acpi_processor_notify, pr);
572 /* _PDC call should be done before doing anything else (if reqd.). */
573 arch_acpi_processor_init_pdc(pr);
574 acpi_processor_set_pdc(pr);
576 #if defined(CONFIG_CPU_FREQ) || defined(CONFIG_PROCESSOR_EXTERNAL_CONTROL)
577 acpi_processor_ppc_has_changed(pr);
578 #endif
580 /*
581 * pr->id may equal to -1 while processor_cntl_external enabled.
582 * throttle and thermal module don't support this case.
583 * Tx only works when dom0 vcpu == pcpu num by far, as we give
584 * control to dom0.
585 */
586 if (pr->id != -1) {
587 acpi_processor_get_throttling_info(pr);
588 acpi_processor_get_limit_info(pr);
589 }
591 acpi_processor_power_init(pr, device);
593 result = processor_extcntl_prepare(pr);
594 if (result)
595 goto end;
597 if (pr->flags.throttling) {
598 printk(KERN_INFO PREFIX "%s [%s] (supports",
599 acpi_device_name(device), acpi_device_bid(device));
600 printk(" %d throttling states", pr->throttling.state_count);
601 printk(")\n");
602 }
604 end:
606 return result;
607 }
609 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
610 {
611 struct acpi_processor *pr = (struct acpi_processor *)data;
612 struct acpi_device *device = NULL;
615 if (!pr)
616 return;
618 if (acpi_bus_get_device(pr->handle, &device))
619 return;
621 switch (event) {
622 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
623 acpi_processor_ppc_has_changed(pr);
624 acpi_bus_generate_event(device, event,
625 pr->performance_platform_limit);
626 break;
627 case ACPI_PROCESSOR_NOTIFY_POWER:
628 acpi_processor_cst_has_changed(pr);
629 acpi_bus_generate_event(device, event, 0);
630 break;
631 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
632 acpi_processor_tstate_has_changed(pr);
633 acpi_bus_generate_event(device, event, 0);
634 break;
635 default:
636 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
637 "Unsupported event [0x%x]\n", event));
638 break;
639 }
641 return;
642 }
644 static int acpi_processor_add(struct acpi_device *device)
645 {
646 struct acpi_processor *pr = NULL;
649 if (!device)
650 return -EINVAL;
652 pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
653 if (!pr)
654 return -ENOMEM;
655 memset(pr, 0, sizeof(struct acpi_processor));
657 pr->handle = device->handle;
658 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
659 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
660 acpi_driver_data(device) = pr;
662 return 0;
663 }
665 static int acpi_processor_remove(struct acpi_device *device, int type)
666 {
667 acpi_status status = AE_OK;
668 struct acpi_processor *pr = NULL;
671 if (!device || !acpi_driver_data(device))
672 return -EINVAL;
674 pr = (struct acpi_processor *)acpi_driver_data(device);
676 if (!processor_cntl_external() && pr->id >= NR_CPUS) {
677 kfree(pr);
678 return 0;
679 }
681 if (type == ACPI_BUS_REMOVAL_EJECT) {
682 if (acpi_processor_handle_eject(pr))
683 return -EINVAL;
684 }
686 acpi_processor_power_exit(pr, device);
688 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
689 acpi_processor_notify);
691 acpi_processor_remove_fs(device);
693 #ifdef CONFIG_XEN
694 if (pr->id != -1)
695 processors[pr->id] = NULL;
696 #else
697 processors[pr->id] = NULL;
698 #endif /* CONFIG_XEN */
701 kfree(pr);
703 return 0;
704 }
706 #ifdef CONFIG_ACPI_HOTPLUG_CPU
707 /****************************************************************************
708 * Acpi processor hotplug support *
709 ****************************************************************************/
711 static int is_processor_present(acpi_handle handle);
713 static int is_processor_present(acpi_handle handle)
714 {
715 acpi_status status;
716 unsigned long sta = 0;
719 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
720 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
721 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
722 return 0;
723 }
724 return 1;
725 }
727 static
728 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
729 {
730 acpi_handle phandle;
731 struct acpi_device *pdev;
732 struct acpi_processor *pr;
735 if (acpi_get_parent(handle, &phandle)) {
736 return -ENODEV;
737 }
739 if (acpi_bus_get_device(phandle, &pdev)) {
740 return -ENODEV;
741 }
743 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
744 return -ENODEV;
745 }
747 acpi_bus_start(*device);
749 pr = acpi_driver_data(*device);
750 if (!pr)
751 return -ENODEV;
753 if (processor_cntl_external())
754 processor_notify_external(pr,
755 PROCESSOR_HOTPLUG, HOTPLUG_TYPE_ADD);
757 if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
758 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
759 }
760 return 0;
761 }
763 static void
764 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
765 {
766 struct acpi_processor *pr;
767 struct acpi_device *device = NULL;
768 int result;
771 switch (event) {
772 case ACPI_NOTIFY_BUS_CHECK:
773 case ACPI_NOTIFY_DEVICE_CHECK:
774 printk("Processor driver received %s event\n",
775 (event == ACPI_NOTIFY_BUS_CHECK) ?
776 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
778 if (!is_processor_present(handle))
779 break;
781 if (acpi_bus_get_device(handle, &device)) {
782 result = acpi_processor_device_add(handle, &device);
783 if (result)
784 printk(KERN_ERR PREFIX
785 "Unable to add the device\n");
786 break;
787 }
789 pr = acpi_driver_data(device);
790 if (!pr) {
791 printk(KERN_ERR PREFIX "Driver data is NULL\n");
792 break;
793 }
795 if (processor_cntl_external())
796 processor_notify_external(pr,
797 PROCESSOR_HOTPLUG, HOTPLUG_TYPE_ADD);
799 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
800 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
801 break;
802 }
804 result = acpi_processor_start(device);
805 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
806 kobject_uevent(&device->kobj, KOBJ_ONLINE);
807 } else {
808 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
809 acpi_device_bid(device));
810 }
811 break;
812 case ACPI_NOTIFY_EJECT_REQUEST:
813 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
814 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
816 if (acpi_bus_get_device(handle, &device)) {
817 printk(KERN_ERR PREFIX
818 "Device don't exist, dropping EJECT\n");
819 break;
820 }
821 pr = acpi_driver_data(device);
822 if (!pr) {
823 printk(KERN_ERR PREFIX
824 "Driver data is NULL, dropping EJECT\n");
825 return;
826 }
828 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
829 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
831 if (processor_cntl_external())
832 processor_notify_external(pr, PROCESSOR_HOTPLUG,
833 HOTPLUG_TYPE_REMOVE);
835 break;
836 default:
837 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
838 "Unsupported event [0x%x]\n", event));
839 break;
840 }
842 return;
843 }
845 static acpi_status
846 processor_walk_namespace_cb(acpi_handle handle,
847 u32 lvl, void *context, void **rv)
848 {
849 acpi_status status;
850 int *action = context;
851 acpi_object_type type = 0;
853 status = acpi_get_type(handle, &type);
854 if (ACPI_FAILURE(status))
855 return (AE_OK);
857 if (type != ACPI_TYPE_PROCESSOR)
858 return (AE_OK);
860 switch (*action) {
861 case INSTALL_NOTIFY_HANDLER:
862 acpi_install_notify_handler(handle,
863 ACPI_SYSTEM_NOTIFY,
864 acpi_processor_hotplug_notify,
865 NULL);
866 break;
867 case UNINSTALL_NOTIFY_HANDLER:
868 acpi_remove_notify_handler(handle,
869 ACPI_SYSTEM_NOTIFY,
870 acpi_processor_hotplug_notify);
871 break;
872 default:
873 break;
874 }
876 return (AE_OK);
877 }
879 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
880 {
882 if (!is_processor_present(handle)) {
883 return AE_ERROR;
884 }
886 if (acpi_map_lsapic(handle, p_cpu))
887 return AE_ERROR;
889 if (arch_register_cpu(*p_cpu)) {
890 acpi_unmap_lsapic(*p_cpu);
891 return AE_ERROR;
892 }
894 return AE_OK;
895 }
897 static int acpi_processor_handle_eject(struct acpi_processor *pr)
898 {
899 #ifdef CONFIG_XEN
900 if (pr->id == -1)
901 return (0);
902 #endif /* CONFIG_XEN */
904 if (cpu_online(pr->id)) {
905 return (-EINVAL);
906 }
907 arch_unregister_cpu(pr->id);
908 acpi_unmap_lsapic(pr->id);
909 return (0);
910 }
911 #else
912 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
913 {
914 return AE_ERROR;
915 }
916 static int acpi_processor_handle_eject(struct acpi_processor *pr)
917 {
918 return (-EINVAL);
919 }
920 #endif
922 static
923 void acpi_processor_install_hotplug_notify(void)
924 {
925 #ifdef CONFIG_ACPI_HOTPLUG_CPU
926 int action = INSTALL_NOTIFY_HANDLER;
927 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
928 ACPI_ROOT_OBJECT,
929 ACPI_UINT32_MAX,
930 processor_walk_namespace_cb, &action, NULL);
931 #endif
932 }
934 static
935 void acpi_processor_uninstall_hotplug_notify(void)
936 {
937 #ifdef CONFIG_ACPI_HOTPLUG_CPU
938 int action = UNINSTALL_NOTIFY_HANDLER;
939 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
940 ACPI_ROOT_OBJECT,
941 ACPI_UINT32_MAX,
942 processor_walk_namespace_cb, &action, NULL);
943 #endif
944 }
946 /*
947 * We keep the driver loaded even when ACPI is not running.
948 * This is needed for the powernow-k8 driver, that works even without
949 * ACPI, but needs symbols from this driver
950 */
952 static int __init acpi_processor_init(void)
953 {
954 int result = 0;
957 memset(&processors, 0, sizeof(processors));
958 memset(&errata, 0, sizeof(errata));
960 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
961 if (!acpi_processor_dir)
962 return 0;
963 acpi_processor_dir->owner = THIS_MODULE;
965 result = acpi_bus_register_driver(&acpi_processor_driver);
966 if (result < 0) {
967 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
968 return 0;
969 }
971 acpi_processor_install_hotplug_notify();
973 acpi_thermal_cpufreq_init();
975 acpi_processor_ppc_init();
977 acpi_processor_throttling_init();
979 return 0;
980 }
982 static void __exit acpi_processor_exit(void)
983 {
985 acpi_processor_ppc_exit();
987 acpi_thermal_cpufreq_exit();
989 acpi_processor_uninstall_hotplug_notify();
991 acpi_bus_unregister_driver(&acpi_processor_driver);
993 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
995 return;
996 }
998 module_init(acpi_processor_init);
999 module_exit(acpi_processor_exit);
1001 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1003 MODULE_ALIAS("processor");