Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / processor_driver.c
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/dmi.h>
44 #include <linux/moduleparam.h>
45 #include <linux/cpuidle.h>
46 #include <linux/slab.h>
47
48 #include <asm/io.h>
49 #include <asm/cpu.h>
50 #include <asm/delay.h>
51 #include <asm/uaccess.h>
52 #include <asm/processor.h>
53 #include <asm/smp.h>
54 #include <asm/acpi.h>
55
56 #include <acpi/acpi_bus.h>
57 #include <acpi/acpi_drivers.h>
58 #include <acpi/processor.h>
59
60 #define PREFIX "ACPI: "
61
62 #define ACPI_PROCESSOR_CLASS            "processor"
63 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
64 #define ACPI_PROCESSOR_FILE_INFO        "info"
65 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
66 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
68 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
69 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
70 #define ACPI_PROCESSOR_DEVICE_HID       "ACPI0007"
71
72 #define ACPI_PROCESSOR_LIMIT_USER       0
73 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
74
75 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
76 ACPI_MODULE_NAME("processor_driver");
77
78 MODULE_AUTHOR("Paul Diefenbaugh");
79 MODULE_DESCRIPTION("ACPI Processor Driver");
80 MODULE_LICENSE("GPL");
81
82 static int acpi_processor_add(struct acpi_device *device);
83 static int acpi_processor_remove(struct acpi_device *device, int type);
84 static void acpi_processor_notify(struct acpi_device *device, u32 event);
85 static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr);
86 static int acpi_processor_handle_eject(struct acpi_processor *pr);
87 static int acpi_processor_start(struct acpi_processor *pr);
88
89 static const struct acpi_device_id processor_device_ids[] = {
90         {ACPI_PROCESSOR_OBJECT_HID, 0},
91         {ACPI_PROCESSOR_DEVICE_HID, 0},
92         {"", 0},
93 };
94 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
95
96 static struct acpi_driver acpi_processor_driver = {
97         .name = "processor",
98         .class = ACPI_PROCESSOR_CLASS,
99         .ids = processor_device_ids,
100         .ops = {
101                 .add = acpi_processor_add,
102                 .remove = acpi_processor_remove,
103                 .suspend = acpi_processor_suspend,
104                 .resume = acpi_processor_resume,
105                 .notify = acpi_processor_notify,
106                 },
107 };
108
109 #define INSTALL_NOTIFY_HANDLER          1
110 #define UNINSTALL_NOTIFY_HANDLER        2
111
112 DEFINE_PER_CPU(struct acpi_processor *, processors);
113 EXPORT_PER_CPU_SYMBOL(processors);
114
115 struct acpi_processor_errata errata __read_mostly;
116
117 /* --------------------------------------------------------------------------
118                                 Errata Handling
119    -------------------------------------------------------------------------- */
120
121 static int acpi_processor_errata_piix4(struct pci_dev *dev)
122 {
123         u8 value1 = 0;
124         u8 value2 = 0;
125
126
127         if (!dev)
128                 return -EINVAL;
129
130         /*
131          * Note that 'dev' references the PIIX4 ACPI Controller.
132          */
133
134         switch (dev->revision) {
135         case 0:
136                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
137                 break;
138         case 1:
139                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
140                 break;
141         case 2:
142                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
143                 break;
144         case 3:
145                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
146                 break;
147         default:
148                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
149                 break;
150         }
151
152         switch (dev->revision) {
153
154         case 0:         /* PIIX4 A-step */
155         case 1:         /* PIIX4 B-step */
156                 /*
157                  * See specification changes #13 ("Manual Throttle Duty Cycle")
158                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
159                  * erratum #5 ("STPCLK# Deassertion Time") from the January
160                  * 2002 PIIX4 specification update.  Applies to only older
161                  * PIIX4 models.
162                  */
163                 errata.piix4.throttle = 1;
164
165         case 2:         /* PIIX4E */
166         case 3:         /* PIIX4M */
167                 /*
168                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
169                  * Livelock") from the January 2002 PIIX4 specification update.
170                  * Applies to all PIIX4 models.
171                  */
172
173                 /*
174                  * BM-IDE
175                  * ------
176                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
177                  * Status register address.  We'll use this later to read
178                  * each IDE controller's DMA status to make sure we catch all
179                  * DMA activity.
180                  */
181                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
182                                      PCI_DEVICE_ID_INTEL_82371AB,
183                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
184                 if (dev) {
185                         errata.piix4.bmisx = pci_resource_start(dev, 4);
186                         pci_dev_put(dev);
187                 }
188
189                 /*
190                  * Type-F DMA
191                  * ----------
192                  * Find the PIIX4 ISA Controller and read the Motherboard
193                  * DMA controller's status to see if Type-F (Fast) DMA mode
194                  * is enabled (bit 7) on either channel.  Note that we'll
195                  * disable C3 support if this is enabled, as some legacy
196                  * devices won't operate well if fast DMA is disabled.
197                  */
198                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
199                                      PCI_DEVICE_ID_INTEL_82371AB_0,
200                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
201                 if (dev) {
202                         pci_read_config_byte(dev, 0x76, &value1);
203                         pci_read_config_byte(dev, 0x77, &value2);
204                         if ((value1 & 0x80) || (value2 & 0x80))
205                                 errata.piix4.fdma = 1;
206                         pci_dev_put(dev);
207                 }
208
209                 break;
210         }
211
212         if (errata.piix4.bmisx)
213                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
214                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
215         if (errata.piix4.fdma)
216                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
217                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
218
219         return 0;
220 }
221
222 static int acpi_processor_errata(struct acpi_processor *pr)
223 {
224         int result = 0;
225         struct pci_dev *dev = NULL;
226
227
228         if (!pr)
229                 return -EINVAL;
230
231         /*
232          * PIIX4
233          */
234         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
235                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
236                              PCI_ANY_ID, NULL);
237         if (dev) {
238                 result = acpi_processor_errata_piix4(dev);
239                 pci_dev_put(dev);
240         }
241
242         return result;
243 }
244
245 /* --------------------------------------------------------------------------
246                                  Driver Interface
247    -------------------------------------------------------------------------- */
248
249 static int acpi_processor_get_info(struct acpi_device *device)
250 {
251         acpi_status status = 0;
252         union acpi_object object = { 0 };
253         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
254         struct acpi_processor *pr;
255         int cpu_index, device_declaration = 0;
256         static int cpu0_initialized;
257
258         pr = acpi_driver_data(device);
259         if (!pr)
260                 return -EINVAL;
261
262         if (num_online_cpus() > 1)
263                 errata.smp = TRUE;
264
265         acpi_processor_errata(pr);
266
267         /*
268          * Check to see if we have bus mastering arbitration control.  This
269          * is required for proper C3 usage (to maintain cache coherency).
270          */
271         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
272                 pr->flags.bm_control = 1;
273                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
274                                   "Bus mastering arbitration control present\n"));
275         } else
276                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
277                                   "No bus mastering arbitration control\n"));
278
279         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
280                 /* Declared with "Processor" statement; match ProcessorID */
281                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
282                 if (ACPI_FAILURE(status)) {
283                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
284                         return -ENODEV;
285                 }
286
287                 /*
288                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
289                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
290                  *      arch/xxx/acpi.c
291                  */
292                 pr->acpi_id = object.processor.proc_id;
293         } else {
294                 /*
295                  * Declared with "Device" statement; match _UID.
296                  * Note that we don't handle string _UIDs yet.
297                  */
298                 unsigned long long value;
299                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
300                                                 NULL, &value);
301                 if (ACPI_FAILURE(status)) {
302                         printk(KERN_ERR PREFIX
303                             "Evaluating processor _UID [%#x]\n", status);
304                         return -ENODEV;
305                 }
306                 device_declaration = 1;
307                 pr->acpi_id = value;
308         }
309         cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
310
311         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
312         if (!cpu0_initialized && (cpu_index == -1) &&
313             (num_online_cpus() == 1)) {
314                 cpu_index = 0;
315         }
316
317         cpu0_initialized = 1;
318
319         pr->id = cpu_index;
320
321         /*
322          *  Extra Processor objects may be enumerated on MP systems with
323          *  less than the max # of CPUs. They should be ignored _iff
324          *  they are physically not present.
325          */
326         if (pr->id == -1) {
327                 if (ACPI_FAILURE(acpi_processor_hotadd_init(pr)))
328                         return -ENODEV;
329         }
330         /*
331          * On some boxes several processors use the same processor bus id.
332          * But they are located in different scope. For example:
333          * \_SB.SCK0.CPU0
334          * \_SB.SCK1.CPU0
335          * Rename the processor device bus id. And the new bus id will be
336          * generated as the following format:
337          * CPU+CPU ID.
338          */
339         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
340         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
341                           pr->acpi_id));
342
343         if (!object.processor.pblk_address)
344                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
345         else if (object.processor.pblk_length != 6)
346                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
347                             object.processor.pblk_length);
348         else {
349                 pr->throttling.address = object.processor.pblk_address;
350                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
351                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
352
353                 pr->pblk = object.processor.pblk_address;
354
355                 /*
356                  * We don't care about error returns - we just try to mark
357                  * these reserved so that nobody else is confused into thinking
358                  * that this region might be unused..
359                  *
360                  * (In particular, allocating the IO range for Cardbus)
361                  */
362                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
363         }
364
365         /*
366          * If ACPI describes a slot number for this CPU, we can use it
367          * ensure we get the right value in the "physical id" field
368          * of /proc/cpuinfo
369          */
370         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
371         if (ACPI_SUCCESS(status))
372                 arch_fix_phys_package_id(pr->id, object.integer.value);
373
374         return 0;
375 }
376
377 static DEFINE_PER_CPU(void *, processor_device_array);
378
379 static void acpi_processor_notify(struct acpi_device *device, u32 event)
380 {
381         struct acpi_processor *pr = acpi_driver_data(device);
382         int saved;
383
384         if (!pr)
385                 return;
386
387         switch (event) {
388         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
389                 saved = pr->performance_platform_limit;
390                 acpi_processor_ppc_has_changed(pr, 1);
391                 if (saved == pr->performance_platform_limit)
392                         break;
393                 acpi_bus_generate_proc_event(device, event,
394                                         pr->performance_platform_limit);
395                 acpi_bus_generate_netlink_event(device->pnp.device_class,
396                                                   dev_name(&device->dev), event,
397                                                   pr->performance_platform_limit);
398                 break;
399         case ACPI_PROCESSOR_NOTIFY_POWER:
400                 acpi_processor_cst_has_changed(pr);
401                 acpi_bus_generate_proc_event(device, event, 0);
402                 acpi_bus_generate_netlink_event(device->pnp.device_class,
403                                                   dev_name(&device->dev), event, 0);
404                 break;
405         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
406                 acpi_processor_tstate_has_changed(pr);
407                 acpi_bus_generate_proc_event(device, event, 0);
408                 acpi_bus_generate_netlink_event(device->pnp.device_class,
409                                                   dev_name(&device->dev), event, 0);
410                 break;
411         default:
412                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
413                                   "Unsupported event [0x%x]\n", event));
414                 break;
415         }
416
417         return;
418 }
419
420 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
421                 unsigned long action, void *hcpu)
422 {
423         unsigned int cpu = (unsigned long)hcpu;
424         struct acpi_processor *pr = per_cpu(processors, cpu);
425
426         if (action == CPU_ONLINE && pr) {
427                 /* CPU got physically hotplugged and onlined the first time:
428                  * Initialize missing things
429                  */
430                 if (pr->flags.need_hotplug_init) {
431                         struct cpuidle_driver *idle_driver =
432                                 cpuidle_get_driver();
433
434                         printk(KERN_INFO "Will online and init hotplugged "
435                                "CPU: %d\n", pr->id);
436                         WARN(acpi_processor_start(pr), "Failed to start CPU:"
437                                 " %d\n", pr->id);
438                         pr->flags.need_hotplug_init = 0;
439                         if (idle_driver && !strcmp(idle_driver->name,
440                                                    "intel_idle")) {
441                                 intel_idle_cpu_init(pr->id);
442                         }
443                 /* Normal CPU soft online event */
444                 } else {
445                         acpi_processor_ppc_has_changed(pr, 0);
446                         acpi_processor_hotplug(pr);
447                         acpi_processor_reevaluate_tstate(pr, action);
448                         acpi_processor_tstate_has_changed(pr);
449                 }
450         }
451         if (action == CPU_DEAD && pr) {
452                 /* invalidate the flag.throttling after one CPU is offline */
453                 acpi_processor_reevaluate_tstate(pr, action);
454         }
455         return NOTIFY_OK;
456 }
457
458 static struct notifier_block acpi_cpu_notifier =
459 {
460             .notifier_call = acpi_cpu_soft_notify,
461 };
462
463 /*
464  * acpi_processor_start() is called by the cpu_hotplug_notifier func:
465  * acpi_cpu_soft_notify(). Getting it __cpuinit{data} is difficult, the
466  * root cause seem to be that acpi_processor_uninstall_hotplug_notify()
467  * is in the module_exit (__exit) func. Allowing acpi_processor_start()
468  * to not be in __cpuinit section, but being called from __cpuinit funcs
469  * via __ref looks like the right thing to do here.
470  */
471 static __ref int acpi_processor_start(struct acpi_processor *pr)
472 {
473         struct acpi_device *device = per_cpu(processor_device_array, pr->id);
474         int result = 0;
475
476 #ifdef CONFIG_CPU_FREQ
477         acpi_processor_ppc_has_changed(pr, 0);
478         acpi_processor_load_module(pr);
479 #endif
480         acpi_processor_get_throttling_info(pr);
481         acpi_processor_get_limit_info(pr);
482
483         if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
484                 acpi_processor_power_init(pr, device);
485
486         pr->cdev = thermal_cooling_device_register("Processor", device,
487                                                    &processor_cooling_ops);
488         if (IS_ERR(pr->cdev)) {
489                 result = PTR_ERR(pr->cdev);
490                 goto err_power_exit;
491         }
492
493         dev_dbg(&device->dev, "registered as cooling_device%d\n",
494                 pr->cdev->id);
495
496         result = sysfs_create_link(&device->dev.kobj,
497                                    &pr->cdev->device.kobj,
498                                    "thermal_cooling");
499         if (result) {
500                 printk(KERN_ERR PREFIX "Create sysfs link\n");
501                 goto err_thermal_unregister;
502         }
503         result = sysfs_create_link(&pr->cdev->device.kobj,
504                                    &device->dev.kobj,
505                                    "device");
506         if (result) {
507                 printk(KERN_ERR PREFIX "Create sysfs link\n");
508                 goto err_remove_sysfs_thermal;
509         }
510
511         return 0;
512
513 err_remove_sysfs_thermal:
514         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
515 err_thermal_unregister:
516         thermal_cooling_device_unregister(pr->cdev);
517 err_power_exit:
518         acpi_processor_power_exit(pr, device);
519
520         return result;
521 }
522
523 /*
524  * Do not put anything in here which needs the core to be online.
525  * For example MSR access or setting up things which check for cpuinfo_x86
526  * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
527  * Such things have to be put in and set up above in acpi_processor_start()
528  */
529 static int __cpuinit acpi_processor_add(struct acpi_device *device)
530 {
531         struct acpi_processor *pr = NULL;
532         int result = 0;
533         struct device *dev;
534
535         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
536         if (!pr)
537                 return -ENOMEM;
538
539         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
540                 result = -ENOMEM;
541                 goto err_free_pr;
542         }
543
544         pr->handle = device->handle;
545         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
546         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
547         device->driver_data = pr;
548
549         result = acpi_processor_get_info(device);
550         if (result) {
551                 /* Processor is physically not present */
552                 return 0;
553         }
554
555 #ifdef CONFIG_SMP
556         if (pr->id >= setup_max_cpus && pr->id != 0)
557                 return 0;
558 #endif
559
560         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
561
562         /*
563          * Buggy BIOS check
564          * ACPI id of processors can be reported wrongly by the BIOS.
565          * Don't trust it blindly
566          */
567         if (per_cpu(processor_device_array, pr->id) != NULL &&
568             per_cpu(processor_device_array, pr->id) != device) {
569                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
570                         "for the processor\n");
571                 result = -ENODEV;
572                 goto err_free_cpumask;
573         }
574         per_cpu(processor_device_array, pr->id) = device;
575
576         per_cpu(processors, pr->id) = pr;
577
578         dev = get_cpu_device(pr->id);
579         if (sysfs_create_link(&device->dev.kobj, &dev->kobj, "sysdev")) {
580                 result = -EFAULT;
581                 goto err_clear_processor;
582         }
583
584         /*
585          * Do not start hotplugged CPUs now, but when they
586          * are onlined the first time
587          */
588         if (pr->flags.need_hotplug_init)
589                 return 0;
590
591         result = acpi_processor_start(pr);
592         if (result)
593                 goto err_remove_sysfs;
594
595         return 0;
596
597 err_remove_sysfs:
598         sysfs_remove_link(&device->dev.kobj, "sysdev");
599 err_clear_processor:
600         /*
601          * processor_device_array is not cleared to allow checks for buggy BIOS
602          */ 
603         per_cpu(processors, pr->id) = NULL;
604 err_free_cpumask:
605         free_cpumask_var(pr->throttling.shared_cpu_map);
606 err_free_pr:
607         kfree(pr);
608         return result;
609 }
610
611 static int acpi_processor_remove(struct acpi_device *device, int type)
612 {
613         struct acpi_processor *pr = NULL;
614
615
616         if (!device || !acpi_driver_data(device))
617                 return -EINVAL;
618
619         pr = acpi_driver_data(device);
620
621         if (pr->id >= nr_cpu_ids)
622                 goto free;
623
624         if (type == ACPI_BUS_REMOVAL_EJECT) {
625                 if (acpi_processor_handle_eject(pr))
626                         return -EINVAL;
627         }
628
629         acpi_processor_power_exit(pr, device);
630
631         sysfs_remove_link(&device->dev.kobj, "sysdev");
632
633         if (pr->cdev) {
634                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
635                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
636                 thermal_cooling_device_unregister(pr->cdev);
637                 pr->cdev = NULL;
638         }
639
640         per_cpu(processors, pr->id) = NULL;
641         per_cpu(processor_device_array, pr->id) = NULL;
642
643 free:
644         free_cpumask_var(pr->throttling.shared_cpu_map);
645         kfree(pr);
646
647         return 0;
648 }
649
650 #ifdef CONFIG_ACPI_HOTPLUG_CPU
651 /****************************************************************************
652  *      Acpi processor hotplug support                                      *
653  ****************************************************************************/
654
655 static int is_processor_present(acpi_handle handle)
656 {
657         acpi_status status;
658         unsigned long long sta = 0;
659
660
661         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
662
663         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
664                 return 1;
665
666         /*
667          * _STA is mandatory for a processor that supports hot plug
668          */
669         if (status == AE_NOT_FOUND)
670                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
671                                 "Processor does not support hot plug\n"));
672         else
673                 ACPI_EXCEPTION((AE_INFO, status,
674                                 "Processor Device is not present"));
675         return 0;
676 }
677
678 static
679 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
680 {
681         acpi_handle phandle;
682         struct acpi_device *pdev;
683
684
685         if (acpi_get_parent(handle, &phandle)) {
686                 return -ENODEV;
687         }
688
689         if (acpi_bus_get_device(phandle, &pdev)) {
690                 return -ENODEV;
691         }
692
693         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
694                 return -ENODEV;
695         }
696
697         return 0;
698 }
699
700 static void acpi_processor_hotplug_notify(acpi_handle handle,
701                                           u32 event, void *data)
702 {
703         struct acpi_processor *pr;
704         struct acpi_device *device = NULL;
705         int result;
706
707
708         switch (event) {
709         case ACPI_NOTIFY_BUS_CHECK:
710         case ACPI_NOTIFY_DEVICE_CHECK:
711                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
712                 "Processor driver received %s event\n",
713                        (event == ACPI_NOTIFY_BUS_CHECK) ?
714                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
715
716                 if (!is_processor_present(handle))
717                         break;
718
719                 if (acpi_bus_get_device(handle, &device)) {
720                         result = acpi_processor_device_add(handle, &device);
721                         if (result)
722                                 printk(KERN_ERR PREFIX
723                                             "Unable to add the device\n");
724                         break;
725                 }
726                 break;
727         case ACPI_NOTIFY_EJECT_REQUEST:
728                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
729                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
730
731                 if (acpi_bus_get_device(handle, &device)) {
732                         printk(KERN_ERR PREFIX
733                                     "Device don't exist, dropping EJECT\n");
734                         break;
735                 }
736                 pr = acpi_driver_data(device);
737                 if (!pr) {
738                         printk(KERN_ERR PREFIX
739                                     "Driver data is NULL, dropping EJECT\n");
740                         return;
741                 }
742                 break;
743         default:
744                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
745                                   "Unsupported event [0x%x]\n", event));
746                 break;
747         }
748
749         return;
750 }
751
752 static acpi_status is_processor_device(acpi_handle handle)
753 {
754         struct acpi_device_info *info;
755         char *hid;
756         acpi_status status;
757
758         status = acpi_get_object_info(handle, &info);
759         if (ACPI_FAILURE(status))
760                 return status;
761
762         if (info->type == ACPI_TYPE_PROCESSOR) {
763                 kfree(info);
764                 return AE_OK;   /* found a processor object */
765         }
766
767         if (!(info->valid & ACPI_VALID_HID)) {
768                 kfree(info);
769                 return AE_ERROR;
770         }
771
772         hid = info->hardware_id.string;
773         if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) {
774                 kfree(info);
775                 return AE_ERROR;
776         }
777
778         kfree(info);
779         return AE_OK;   /* found a processor device object */
780 }
781
782 static acpi_status
783 processor_walk_namespace_cb(acpi_handle handle,
784                             u32 lvl, void *context, void **rv)
785 {
786         acpi_status status;
787         int *action = context;
788
789         status = is_processor_device(handle);
790         if (ACPI_FAILURE(status))
791                 return AE_OK;   /* not a processor; continue to walk */
792
793         switch (*action) {
794         case INSTALL_NOTIFY_HANDLER:
795                 acpi_install_notify_handler(handle,
796                                             ACPI_SYSTEM_NOTIFY,
797                                             acpi_processor_hotplug_notify,
798                                             NULL);
799                 break;
800         case UNINSTALL_NOTIFY_HANDLER:
801                 acpi_remove_notify_handler(handle,
802                                            ACPI_SYSTEM_NOTIFY,
803                                            acpi_processor_hotplug_notify);
804                 break;
805         default:
806                 break;
807         }
808
809         /* found a processor; skip walking underneath */
810         return AE_CTRL_DEPTH;
811 }
812
813 static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
814 {
815         acpi_handle handle = pr->handle;
816
817         if (!is_processor_present(handle)) {
818                 return AE_ERROR;
819         }
820
821         if (acpi_map_lsapic(handle, &pr->id))
822                 return AE_ERROR;
823
824         if (arch_register_cpu(pr->id)) {
825                 acpi_unmap_lsapic(pr->id);
826                 return AE_ERROR;
827         }
828
829         /* CPU got hot-plugged, but cpu_data is not initialized yet
830          * Set flag to delay cpu_idle/throttling initialization
831          * in:
832          * acpi_processor_add()
833          *   acpi_processor_get_info()
834          * and do it when the CPU gets online the first time
835          * TBD: Cleanup above functions and try to do this more elegant.
836          */
837         printk(KERN_INFO "CPU %d got hotplugged\n", pr->id);
838         pr->flags.need_hotplug_init = 1;
839
840         return AE_OK;
841 }
842
843 static int acpi_processor_handle_eject(struct acpi_processor *pr)
844 {
845         if (cpu_online(pr->id))
846                 cpu_down(pr->id);
847
848         arch_unregister_cpu(pr->id);
849         acpi_unmap_lsapic(pr->id);
850         return (0);
851 }
852 #else
853 static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
854 {
855         return AE_ERROR;
856 }
857 static int acpi_processor_handle_eject(struct acpi_processor *pr)
858 {
859         return (-EINVAL);
860 }
861 #endif
862
863 static
864 void acpi_processor_install_hotplug_notify(void)
865 {
866 #ifdef CONFIG_ACPI_HOTPLUG_CPU
867         int action = INSTALL_NOTIFY_HANDLER;
868         acpi_walk_namespace(ACPI_TYPE_ANY,
869                             ACPI_ROOT_OBJECT,
870                             ACPI_UINT32_MAX,
871                             processor_walk_namespace_cb, NULL, &action, NULL);
872 #endif
873         register_hotcpu_notifier(&acpi_cpu_notifier);
874 }
875
876 static
877 void acpi_processor_uninstall_hotplug_notify(void)
878 {
879 #ifdef CONFIG_ACPI_HOTPLUG_CPU
880         int action = UNINSTALL_NOTIFY_HANDLER;
881         acpi_walk_namespace(ACPI_TYPE_ANY,
882                             ACPI_ROOT_OBJECT,
883                             ACPI_UINT32_MAX,
884                             processor_walk_namespace_cb, NULL, &action, NULL);
885 #endif
886         unregister_hotcpu_notifier(&acpi_cpu_notifier);
887 }
888
889 /*
890  * We keep the driver loaded even when ACPI is not running.
891  * This is needed for the powernow-k8 driver, that works even without
892  * ACPI, but needs symbols from this driver
893  */
894
895 static int __init acpi_processor_init(void)
896 {
897         int result = 0;
898
899         if (acpi_disabled)
900                 return 0;
901
902         memset(&errata, 0, sizeof(errata));
903
904         result = acpi_bus_register_driver(&acpi_processor_driver);
905         if (result < 0)
906                 return result;
907
908         acpi_processor_install_hotplug_notify();
909
910         acpi_thermal_cpufreq_init();
911
912         acpi_processor_ppc_init();
913
914         acpi_processor_throttling_init();
915
916         return 0;
917 }
918
919 static void __exit acpi_processor_exit(void)
920 {
921         if (acpi_disabled)
922                 return;
923
924         acpi_processor_ppc_exit();
925
926         acpi_thermal_cpufreq_exit();
927
928         acpi_processor_uninstall_hotplug_notify();
929
930         acpi_bus_unregister_driver(&acpi_processor_driver);
931
932         return;
933 }
934
935 module_init(acpi_processor_init);
936 module_exit(acpi_processor_exit);
937
938 MODULE_ALIAS("processor");