ACPI: Do not try to set up acpi processor stuff on cores exceeding maxcpus=
[linux-3.10.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/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 #include <linux/slab.h>
49
50 #include <asm/io.h>
51 #include <asm/system.h>
52 #include <asm/cpu.h>
53 #include <asm/delay.h>
54 #include <asm/uaccess.h>
55 #include <asm/processor.h>
56 #include <asm/smp.h>
57 #include <asm/acpi.h>
58
59 #include <acpi/acpi_bus.h>
60 #include <acpi/acpi_drivers.h>
61 #include <acpi/processor.h>
62
63 #define PREFIX "ACPI: "
64
65 #define ACPI_PROCESSOR_CLASS            "processor"
66 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
67 #define ACPI_PROCESSOR_FILE_INFO        "info"
68 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
69 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
70 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
71 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
72 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
73
74 #define ACPI_PROCESSOR_LIMIT_USER       0
75 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
76
77 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
78 ACPI_MODULE_NAME("processor_driver");
79
80 MODULE_AUTHOR("Paul Diefenbaugh");
81 MODULE_DESCRIPTION("ACPI Processor Driver");
82 MODULE_LICENSE("GPL");
83
84 static int acpi_processor_add(struct acpi_device *device);
85 static int acpi_processor_remove(struct acpi_device *device, int type);
86 #ifdef CONFIG_ACPI_PROCFS
87 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
88 #endif
89 static void acpi_processor_notify(struct acpi_device *device, u32 event);
90 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
91 static int acpi_processor_handle_eject(struct acpi_processor *pr);
92
93
94 static const struct acpi_device_id processor_device_ids[] = {
95         {ACPI_PROCESSOR_OBJECT_HID, 0},
96         {"ACPI0007", 0},
97         {"", 0},
98 };
99 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
100
101 static struct acpi_driver acpi_processor_driver = {
102         .name = "processor",
103         .class = ACPI_PROCESSOR_CLASS,
104         .ids = processor_device_ids,
105         .ops = {
106                 .add = acpi_processor_add,
107                 .remove = acpi_processor_remove,
108                 .suspend = acpi_processor_suspend,
109                 .resume = acpi_processor_resume,
110                 .notify = acpi_processor_notify,
111                 },
112 };
113
114 #define INSTALL_NOTIFY_HANDLER          1
115 #define UNINSTALL_NOTIFY_HANDLER        2
116 #ifdef CONFIG_ACPI_PROCFS
117 static const struct file_operations acpi_processor_info_fops = {
118         .owner = THIS_MODULE,
119         .open = acpi_processor_info_open_fs,
120         .read = seq_read,
121         .llseek = seq_lseek,
122         .release = single_release,
123 };
124 #endif
125
126 DEFINE_PER_CPU(struct acpi_processor *, processors);
127 EXPORT_PER_CPU_SYMBOL(processors);
128
129 struct acpi_processor_errata errata __read_mostly;
130
131 /* --------------------------------------------------------------------------
132                                 Errata Handling
133    -------------------------------------------------------------------------- */
134
135 static int acpi_processor_errata_piix4(struct pci_dev *dev)
136 {
137         u8 value1 = 0;
138         u8 value2 = 0;
139
140
141         if (!dev)
142                 return -EINVAL;
143
144         /*
145          * Note that 'dev' references the PIIX4 ACPI Controller.
146          */
147
148         switch (dev->revision) {
149         case 0:
150                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
151                 break;
152         case 1:
153                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
154                 break;
155         case 2:
156                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
157                 break;
158         case 3:
159                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
160                 break;
161         default:
162                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
163                 break;
164         }
165
166         switch (dev->revision) {
167
168         case 0:         /* PIIX4 A-step */
169         case 1:         /* PIIX4 B-step */
170                 /*
171                  * See specification changes #13 ("Manual Throttle Duty Cycle")
172                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
173                  * erratum #5 ("STPCLK# Deassertion Time") from the January
174                  * 2002 PIIX4 specification update.  Applies to only older
175                  * PIIX4 models.
176                  */
177                 errata.piix4.throttle = 1;
178
179         case 2:         /* PIIX4E */
180         case 3:         /* PIIX4M */
181                 /*
182                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
183                  * Livelock") from the January 2002 PIIX4 specification update.
184                  * Applies to all PIIX4 models.
185                  */
186
187                 /*
188                  * BM-IDE
189                  * ------
190                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
191                  * Status register address.  We'll use this later to read
192                  * each IDE controller's DMA status to make sure we catch all
193                  * DMA activity.
194                  */
195                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
196                                      PCI_DEVICE_ID_INTEL_82371AB,
197                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
198                 if (dev) {
199                         errata.piix4.bmisx = pci_resource_start(dev, 4);
200                         pci_dev_put(dev);
201                 }
202
203                 /*
204                  * Type-F DMA
205                  * ----------
206                  * Find the PIIX4 ISA Controller and read the Motherboard
207                  * DMA controller's status to see if Type-F (Fast) DMA mode
208                  * is enabled (bit 7) on either channel.  Note that we'll
209                  * disable C3 support if this is enabled, as some legacy
210                  * devices won't operate well if fast DMA is disabled.
211                  */
212                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
213                                      PCI_DEVICE_ID_INTEL_82371AB_0,
214                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
215                 if (dev) {
216                         pci_read_config_byte(dev, 0x76, &value1);
217                         pci_read_config_byte(dev, 0x77, &value2);
218                         if ((value1 & 0x80) || (value2 & 0x80))
219                                 errata.piix4.fdma = 1;
220                         pci_dev_put(dev);
221                 }
222
223                 break;
224         }
225
226         if (errata.piix4.bmisx)
227                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
228                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
229         if (errata.piix4.fdma)
230                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
231                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
232
233         return 0;
234 }
235
236 static int acpi_processor_errata(struct acpi_processor *pr)
237 {
238         int result = 0;
239         struct pci_dev *dev = NULL;
240
241
242         if (!pr)
243                 return -EINVAL;
244
245         /*
246          * PIIX4
247          */
248         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
249                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
250                              PCI_ANY_ID, NULL);
251         if (dev) {
252                 result = acpi_processor_errata_piix4(dev);
253                 pci_dev_put(dev);
254         }
255
256         return result;
257 }
258
259 /* --------------------------------------------------------------------------
260                               FS Interface (/proc)
261    -------------------------------------------------------------------------- */
262
263 #ifdef CONFIG_ACPI_PROCFS
264 static struct proc_dir_entry *acpi_processor_dir = NULL;
265
266 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
267 {
268         struct acpi_processor *pr = seq->private;
269
270
271         if (!pr)
272                 goto end;
273
274         seq_printf(seq, "processor id:            %d\n"
275                    "acpi id:                 %d\n"
276                    "bus mastering control:   %s\n"
277                    "power management:        %s\n"
278                    "throttling control:      %s\n"
279                    "limit interface:         %s\n",
280                    pr->id,
281                    pr->acpi_id,
282                    pr->flags.bm_control ? "yes" : "no",
283                    pr->flags.power ? "yes" : "no",
284                    pr->flags.throttling ? "yes" : "no",
285                    pr->flags.limit ? "yes" : "no");
286
287       end:
288         return 0;
289 }
290
291 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
292 {
293         return single_open(file, acpi_processor_info_seq_show,
294                            PDE(inode)->data);
295 }
296
297 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
298 {
299         struct proc_dir_entry *entry = NULL;
300
301
302         if (!acpi_device_dir(device)) {
303                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
304                                                      acpi_processor_dir);
305                 if (!acpi_device_dir(device))
306                         return -ENODEV;
307         }
308
309         /* 'info' [R] */
310         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
311                                  S_IRUGO, acpi_device_dir(device),
312                                  &acpi_processor_info_fops,
313                                  acpi_driver_data(device));
314         if (!entry)
315                 return -EIO;
316
317         /* 'throttling' [R/W] */
318         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
319                                  S_IFREG | S_IRUGO | S_IWUSR,
320                                  acpi_device_dir(device),
321                                  &acpi_processor_throttling_fops,
322                                  acpi_driver_data(device));
323         if (!entry)
324                 return -EIO;
325
326         /* 'limit' [R/W] */
327         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
328                                  S_IFREG | S_IRUGO | S_IWUSR,
329                                  acpi_device_dir(device),
330                                  &acpi_processor_limit_fops,
331                                  acpi_driver_data(device));
332         if (!entry)
333                 return -EIO;
334         return 0;
335 }
336 static int acpi_processor_remove_fs(struct acpi_device *device)
337 {
338
339         if (acpi_device_dir(device)) {
340                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
341                                   acpi_device_dir(device));
342                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
343                                   acpi_device_dir(device));
344                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
345                                   acpi_device_dir(device));
346                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
347                 acpi_device_dir(device) = NULL;
348         }
349
350         return 0;
351 }
352 #else
353 static inline int acpi_processor_add_fs(struct acpi_device *device)
354 {
355         return 0;
356 }
357 static inline int acpi_processor_remove_fs(struct acpi_device *device)
358 {
359         return 0;
360 }
361 #endif
362
363 /* --------------------------------------------------------------------------
364                                  Driver Interface
365    -------------------------------------------------------------------------- */
366
367 static int acpi_processor_get_info(struct acpi_device *device)
368 {
369         acpi_status status = 0;
370         union acpi_object object = { 0 };
371         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
372         struct acpi_processor *pr;
373         int cpu_index, device_declaration = 0;
374         static int cpu0_initialized;
375
376         pr = acpi_driver_data(device);
377         if (!pr)
378                 return -EINVAL;
379
380         if (num_online_cpus() > 1)
381                 errata.smp = TRUE;
382
383         acpi_processor_errata(pr);
384
385         /*
386          * Check to see if we have bus mastering arbitration control.  This
387          * is required for proper C3 usage (to maintain cache coherency).
388          */
389         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
390                 pr->flags.bm_control = 1;
391                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
392                                   "Bus mastering arbitration control present\n"));
393         } else
394                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
395                                   "No bus mastering arbitration control\n"));
396
397         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
398                 /* Declared with "Processor" statement; match ProcessorID */
399                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
400                 if (ACPI_FAILURE(status)) {
401                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
402                         return -ENODEV;
403                 }
404
405                 /*
406                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
407                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
408                  *      arch/xxx/acpi.c
409                  */
410                 pr->acpi_id = object.processor.proc_id;
411         } else {
412                 /*
413                  * Declared with "Device" statement; match _UID.
414                  * Note that we don't handle string _UIDs yet.
415                  */
416                 unsigned long long value;
417                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
418                                                 NULL, &value);
419                 if (ACPI_FAILURE(status)) {
420                         printk(KERN_ERR PREFIX
421                             "Evaluating processor _UID [%#x]\n", status);
422                         return -ENODEV;
423                 }
424                 device_declaration = 1;
425                 pr->acpi_id = value;
426         }
427         cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
428
429         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
430         if (!cpu0_initialized && (cpu_index == -1) &&
431             (num_online_cpus() == 1)) {
432                 cpu_index = 0;
433         }
434
435         cpu0_initialized = 1;
436
437         pr->id = cpu_index;
438
439         /*
440          *  Extra Processor objects may be enumerated on MP systems with
441          *  less than the max # of CPUs. They should be ignored _iff
442          *  they are physically not present.
443          */
444         if (pr->id == -1) {
445                 if (ACPI_FAILURE
446                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
447                         return -ENODEV;
448                 }
449         }
450         /*
451          * On some boxes several processors use the same processor bus id.
452          * But they are located in different scope. For example:
453          * \_SB.SCK0.CPU0
454          * \_SB.SCK1.CPU0
455          * Rename the processor device bus id. And the new bus id will be
456          * generated as the following format:
457          * CPU+CPU ID.
458          */
459         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
460         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
461                           pr->acpi_id));
462
463         if (!object.processor.pblk_address)
464                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
465         else if (object.processor.pblk_length != 6)
466                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
467                             object.processor.pblk_length);
468         else {
469                 pr->throttling.address = object.processor.pblk_address;
470                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
471                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
472
473                 pr->pblk = object.processor.pblk_address;
474
475                 /*
476                  * We don't care about error returns - we just try to mark
477                  * these reserved so that nobody else is confused into thinking
478                  * that this region might be unused..
479                  *
480                  * (In particular, allocating the IO range for Cardbus)
481                  */
482                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
483         }
484
485         /*
486          * If ACPI describes a slot number for this CPU, we can use it
487          * ensure we get the right value in the "physical id" field
488          * of /proc/cpuinfo
489          */
490         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
491         if (ACPI_SUCCESS(status))
492                 arch_fix_phys_package_id(pr->id, object.integer.value);
493
494         return 0;
495 }
496
497 static DEFINE_PER_CPU(void *, processor_device_array);
498
499 static void acpi_processor_notify(struct acpi_device *device, u32 event)
500 {
501         struct acpi_processor *pr = acpi_driver_data(device);
502         int saved;
503
504         if (!pr)
505                 return;
506
507         switch (event) {
508         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
509                 saved = pr->performance_platform_limit;
510                 acpi_processor_ppc_has_changed(pr, 1);
511                 if (saved == pr->performance_platform_limit)
512                         break;
513                 acpi_bus_generate_proc_event(device, event,
514                                         pr->performance_platform_limit);
515                 acpi_bus_generate_netlink_event(device->pnp.device_class,
516                                                   dev_name(&device->dev), event,
517                                                   pr->performance_platform_limit);
518                 break;
519         case ACPI_PROCESSOR_NOTIFY_POWER:
520                 acpi_processor_cst_has_changed(pr);
521                 acpi_bus_generate_proc_event(device, event, 0);
522                 acpi_bus_generate_netlink_event(device->pnp.device_class,
523                                                   dev_name(&device->dev), event, 0);
524                 break;
525         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
526                 acpi_processor_tstate_has_changed(pr);
527                 acpi_bus_generate_proc_event(device, event, 0);
528                 acpi_bus_generate_netlink_event(device->pnp.device_class,
529                                                   dev_name(&device->dev), event, 0);
530         default:
531                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
532                                   "Unsupported event [0x%x]\n", event));
533                 break;
534         }
535
536         return;
537 }
538
539 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
540                 unsigned long action, void *hcpu)
541 {
542         unsigned int cpu = (unsigned long)hcpu;
543         struct acpi_processor *pr = per_cpu(processors, cpu);
544
545         if (action == CPU_ONLINE && pr) {
546                 acpi_processor_ppc_has_changed(pr, 0);
547                 acpi_processor_cst_has_changed(pr);
548                 acpi_processor_tstate_has_changed(pr);
549         }
550         return NOTIFY_OK;
551 }
552
553 static struct notifier_block acpi_cpu_notifier =
554 {
555             .notifier_call = acpi_cpu_soft_notify,
556 };
557
558 static int __cpuinit acpi_processor_add(struct acpi_device *device)
559 {
560         struct acpi_processor *pr = NULL;
561         int result = 0;
562         struct sys_device *sysdev;
563
564         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
565         if (!pr)
566                 return -ENOMEM;
567
568         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
569                 kfree(pr);
570                 return -ENOMEM;
571         }
572
573         pr->handle = device->handle;
574         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
575         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
576         device->driver_data = pr;
577
578         result = acpi_processor_get_info(device);
579         if (result) {
580                 /* Processor is physically not present */
581                 return 0;
582         }
583
584 #ifdef CONFIG_SMP
585         if (pr->id >= setup_max_cpus && pr->id != 0)
586                 return 0;
587 #endif
588
589         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
590
591         /*
592          * Buggy BIOS check
593          * ACPI id of processors can be reported wrongly by the BIOS.
594          * Don't trust it blindly
595          */
596         if (per_cpu(processor_device_array, pr->id) != NULL &&
597             per_cpu(processor_device_array, pr->id) != device) {
598                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
599                         "for the processor\n");
600                 result = -ENODEV;
601                 goto err_free_cpumask;
602         }
603         per_cpu(processor_device_array, pr->id) = device;
604
605         per_cpu(processors, pr->id) = pr;
606
607         result = acpi_processor_add_fs(device);
608         if (result)
609                 goto err_free_cpumask;
610
611         sysdev = get_cpu_sysdev(pr->id);
612         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
613                 result = -EFAULT;
614                 goto err_remove_fs;
615         }
616
617 #ifdef CONFIG_CPU_FREQ
618         acpi_processor_ppc_has_changed(pr, 0);
619 #endif
620         acpi_processor_get_throttling_info(pr);
621         acpi_processor_get_limit_info(pr);
622
623
624         if (cpuidle_get_driver() == &acpi_idle_driver)
625                 acpi_processor_power_init(pr, device);
626
627         pr->cdev = thermal_cooling_device_register("Processor", device,
628                                                 &processor_cooling_ops);
629         if (IS_ERR(pr->cdev)) {
630                 result = PTR_ERR(pr->cdev);
631                 goto err_power_exit;
632         }
633
634         dev_dbg(&device->dev, "registered as cooling_device%d\n",
635                  pr->cdev->id);
636
637         result = sysfs_create_link(&device->dev.kobj,
638                                    &pr->cdev->device.kobj,
639                                    "thermal_cooling");
640         if (result) {
641                 printk(KERN_ERR PREFIX "Create sysfs link\n");
642                 goto err_thermal_unregister;
643         }
644         result = sysfs_create_link(&pr->cdev->device.kobj,
645                                    &device->dev.kobj,
646                                    "device");
647         if (result) {
648                 printk(KERN_ERR PREFIX "Create sysfs link\n");
649                 goto err_remove_sysfs;
650         }
651
652         return 0;
653
654 err_remove_sysfs:
655         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
656 err_thermal_unregister:
657         thermal_cooling_device_unregister(pr->cdev);
658 err_power_exit:
659         acpi_processor_power_exit(pr, device);
660 err_remove_fs:
661         acpi_processor_remove_fs(device);
662 err_free_cpumask:
663         free_cpumask_var(pr->throttling.shared_cpu_map);
664
665         return result;
666 }
667
668 static int acpi_processor_remove(struct acpi_device *device, int type)
669 {
670         struct acpi_processor *pr = NULL;
671
672
673         if (!device || !acpi_driver_data(device))
674                 return -EINVAL;
675
676         pr = acpi_driver_data(device);
677
678         if (pr->id >= nr_cpu_ids)
679                 goto free;
680
681         if (type == ACPI_BUS_REMOVAL_EJECT) {
682                 if (acpi_processor_handle_eject(pr))
683                         return -EINVAL;
684         }
685
686         acpi_processor_power_exit(pr, device);
687
688         sysfs_remove_link(&device->dev.kobj, "sysdev");
689
690         acpi_processor_remove_fs(device);
691
692         if (pr->cdev) {
693                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
694                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
695                 thermal_cooling_device_unregister(pr->cdev);
696                 pr->cdev = NULL;
697         }
698
699         per_cpu(processors, pr->id) = NULL;
700         per_cpu(processor_device_array, pr->id) = NULL;
701
702 free:
703         free_cpumask_var(pr->throttling.shared_cpu_map);
704         kfree(pr);
705
706         return 0;
707 }
708
709 #ifdef CONFIG_ACPI_HOTPLUG_CPU
710 /****************************************************************************
711  *      Acpi processor hotplug support                                      *
712  ****************************************************************************/
713
714 static int is_processor_present(acpi_handle handle)
715 {
716         acpi_status status;
717         unsigned long long sta = 0;
718
719
720         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
721
722         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
723                 return 1;
724
725         /*
726          * _STA is mandatory for a processor that supports hot plug
727          */
728         if (status == AE_NOT_FOUND)
729                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
730                                 "Processor does not support hot plug\n"));
731         else
732                 ACPI_EXCEPTION((AE_INFO, status,
733                                 "Processor Device is not present"));
734         return 0;
735 }
736
737 static
738 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
739 {
740         acpi_handle phandle;
741         struct acpi_device *pdev;
742
743
744         if (acpi_get_parent(handle, &phandle)) {
745                 return -ENODEV;
746         }
747
748         if (acpi_bus_get_device(phandle, &pdev)) {
749                 return -ENODEV;
750         }
751
752         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
753                 return -ENODEV;
754         }
755
756         return 0;
757 }
758
759 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
760                                                 u32 event, void *data)
761 {
762         struct acpi_processor *pr;
763         struct acpi_device *device = NULL;
764         int result;
765
766
767         switch (event) {
768         case ACPI_NOTIFY_BUS_CHECK:
769         case ACPI_NOTIFY_DEVICE_CHECK:
770                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
771                 "Processor driver received %s event\n",
772                        (event == ACPI_NOTIFY_BUS_CHECK) ?
773                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
774
775                 if (!is_processor_present(handle))
776                         break;
777
778                 if (acpi_bus_get_device(handle, &device)) {
779                         result = acpi_processor_device_add(handle, &device);
780                         if (result)
781                                 printk(KERN_ERR PREFIX
782                                             "Unable to add the device\n");
783                         break;
784                 }
785                 break;
786         case ACPI_NOTIFY_EJECT_REQUEST:
787                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
788                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
789
790                 if (acpi_bus_get_device(handle, &device)) {
791                         printk(KERN_ERR PREFIX
792                                     "Device don't exist, dropping EJECT\n");
793                         break;
794                 }
795                 pr = acpi_driver_data(device);
796                 if (!pr) {
797                         printk(KERN_ERR PREFIX
798                                     "Driver data is NULL, dropping EJECT\n");
799                         return;
800                 }
801                 break;
802         default:
803                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
804                                   "Unsupported event [0x%x]\n", event));
805                 break;
806         }
807
808         return;
809 }
810
811 static acpi_status
812 processor_walk_namespace_cb(acpi_handle handle,
813                             u32 lvl, void *context, void **rv)
814 {
815         acpi_status status;
816         int *action = context;
817         acpi_object_type type = 0;
818
819         status = acpi_get_type(handle, &type);
820         if (ACPI_FAILURE(status))
821                 return (AE_OK);
822
823         if (type != ACPI_TYPE_PROCESSOR)
824                 return (AE_OK);
825
826         switch (*action) {
827         case INSTALL_NOTIFY_HANDLER:
828                 acpi_install_notify_handler(handle,
829                                             ACPI_SYSTEM_NOTIFY,
830                                             acpi_processor_hotplug_notify,
831                                             NULL);
832                 break;
833         case UNINSTALL_NOTIFY_HANDLER:
834                 acpi_remove_notify_handler(handle,
835                                            ACPI_SYSTEM_NOTIFY,
836                                            acpi_processor_hotplug_notify);
837                 break;
838         default:
839                 break;
840         }
841
842         return (AE_OK);
843 }
844
845 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
846 {
847
848         if (!is_processor_present(handle)) {
849                 return AE_ERROR;
850         }
851
852         if (acpi_map_lsapic(handle, p_cpu))
853                 return AE_ERROR;
854
855         if (arch_register_cpu(*p_cpu)) {
856                 acpi_unmap_lsapic(*p_cpu);
857                 return AE_ERROR;
858         }
859
860         return AE_OK;
861 }
862
863 static int acpi_processor_handle_eject(struct acpi_processor *pr)
864 {
865         if (cpu_online(pr->id))
866                 cpu_down(pr->id);
867
868         arch_unregister_cpu(pr->id);
869         acpi_unmap_lsapic(pr->id);
870         return (0);
871 }
872 #else
873 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
874 {
875         return AE_ERROR;
876 }
877 static int acpi_processor_handle_eject(struct acpi_processor *pr)
878 {
879         return (-EINVAL);
880 }
881 #endif
882
883 static
884 void acpi_processor_install_hotplug_notify(void)
885 {
886 #ifdef CONFIG_ACPI_HOTPLUG_CPU
887         int action = INSTALL_NOTIFY_HANDLER;
888         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
889                             ACPI_ROOT_OBJECT,
890                             ACPI_UINT32_MAX,
891                             processor_walk_namespace_cb, NULL, &action, NULL);
892 #endif
893         register_hotcpu_notifier(&acpi_cpu_notifier);
894 }
895
896 static
897 void acpi_processor_uninstall_hotplug_notify(void)
898 {
899 #ifdef CONFIG_ACPI_HOTPLUG_CPU
900         int action = UNINSTALL_NOTIFY_HANDLER;
901         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
902                             ACPI_ROOT_OBJECT,
903                             ACPI_UINT32_MAX,
904                             processor_walk_namespace_cb, NULL, &action, NULL);
905 #endif
906         unregister_hotcpu_notifier(&acpi_cpu_notifier);
907 }
908
909 /*
910  * We keep the driver loaded even when ACPI is not running.
911  * This is needed for the powernow-k8 driver, that works even without
912  * ACPI, but needs symbols from this driver
913  */
914
915 static int __init acpi_processor_init(void)
916 {
917         int result = 0;
918
919         if (acpi_disabled)
920                 return 0;
921
922         memset(&errata, 0, sizeof(errata));
923
924 #ifdef CONFIG_ACPI_PROCFS
925         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
926         if (!acpi_processor_dir)
927                 return -ENOMEM;
928 #endif
929
930         if (!cpuidle_register_driver(&acpi_idle_driver)) {
931                 printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",
932                         acpi_idle_driver.name);
933         } else {
934                 printk(KERN_DEBUG "ACPI: acpi_idle yielding to %s",
935                         cpuidle_get_driver()->name);
936         }
937
938         result = acpi_bus_register_driver(&acpi_processor_driver);
939         if (result < 0)
940                 goto out_cpuidle;
941
942         acpi_processor_install_hotplug_notify();
943
944         acpi_thermal_cpufreq_init();
945
946         acpi_processor_ppc_init();
947
948         acpi_processor_throttling_init();
949
950         return 0;
951
952 out_cpuidle:
953         cpuidle_unregister_driver(&acpi_idle_driver);
954
955 #ifdef CONFIG_ACPI_PROCFS
956         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
957 #endif
958
959         return result;
960 }
961
962 static void __exit acpi_processor_exit(void)
963 {
964         if (acpi_disabled)
965                 return;
966
967         acpi_processor_ppc_exit();
968
969         acpi_thermal_cpufreq_exit();
970
971         acpi_processor_uninstall_hotplug_notify();
972
973         acpi_bus_unregister_driver(&acpi_processor_driver);
974
975         cpuidle_unregister_driver(&acpi_idle_driver);
976
977 #ifdef CONFIG_ACPI_PROCFS
978         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
979 #endif
980
981         return;
982 }
983
984 module_init(acpi_processor_init);
985 module_exit(acpi_processor_exit);
986
987 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
988
989 MODULE_ALIAS("processor");