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
acpi_processor_errata_piix4(struct pci_dev * dev)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
acpi_processor_errata(struct acpi_processor * pr)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
acpi_processor_get_info(struct acpi_device * device)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
acpi_processor_notify(struct acpi_device * device,u32 event)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
acpi_cpu_soft_notify(struct notifier_block * nfb,unsigned long action,void * hcpu)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 */
acpi_processor_start(struct acpi_processor * pr)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 */
acpi_processor_add(struct acpi_device * device)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
acpi_processor_remove(struct acpi_device * device,int type)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
is_processor_present(acpi_handle handle)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
acpi_processor_device_add(acpi_handle handle,struct acpi_device ** device)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
acpi_processor_hotplug_notify(acpi_handle handle,u32 event,void * data)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
is_processor_device(acpi_handle handle)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
processor_walk_namespace_cb(acpi_handle handle,u32 lvl,void * context,void ** rv)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
acpi_processor_hotadd_init(struct acpi_processor * pr)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
acpi_processor_handle_eject(struct acpi_processor * pr)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
acpi_processor_hotadd_init(struct acpi_processor * pr)853 static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
854 {
855 return AE_ERROR;
856 }
acpi_processor_handle_eject(struct acpi_processor * pr)857 static int acpi_processor_handle_eject(struct acpi_processor *pr)
858 {
859 return (-EINVAL);
860 }
861 #endif
862
863 static
acpi_processor_install_hotplug_notify(void)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
acpi_processor_uninstall_hotplug_notify(void)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
acpi_processor_init(void)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
acpi_processor_exit(void)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");
939