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Rafael J. Wysockiac212b62013-05-03 00:26:22 +02001/*
2 * acpi_processor.c - ACPI processor enumeration support
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 * Copyright (C) 2013, Intel Corporation
9 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License version 2 as published
13 * by the Free Software Foundation.
14 */
15
16#include <linux/acpi.h>
17#include <linux/device.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/pci.h>
21
22#include <acpi/processor.h>
23
24#include <asm/cpu.h>
25
26#include "internal.h"
27
28#define _COMPONENT ACPI_PROCESSOR_COMPONENT
29
30ACPI_MODULE_NAME("processor");
31
Rafael J. Wysocki2e4f1db2013-05-30 21:55:46 +020032DEFINE_PER_CPU(struct acpi_processor *, processors);
33EXPORT_PER_CPU_SYMBOL(processors);
34
Rafael J. Wysockiac212b62013-05-03 00:26:22 +020035/* --------------------------------------------------------------------------
36 Errata Handling
37 -------------------------------------------------------------------------- */
38
39struct acpi_processor_errata errata __read_mostly;
40EXPORT_SYMBOL_GPL(errata);
41
42static int acpi_processor_errata_piix4(struct pci_dev *dev)
43{
44 u8 value1 = 0;
45 u8 value2 = 0;
46
47
48 if (!dev)
49 return -EINVAL;
50
51 /*
52 * Note that 'dev' references the PIIX4 ACPI Controller.
53 */
54
55 switch (dev->revision) {
56 case 0:
57 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
58 break;
59 case 1:
60 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
61 break;
62 case 2:
63 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
64 break;
65 case 3:
66 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
67 break;
68 default:
69 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
70 break;
71 }
72
73 switch (dev->revision) {
74
75 case 0: /* PIIX4 A-step */
76 case 1: /* PIIX4 B-step */
77 /*
78 * See specification changes #13 ("Manual Throttle Duty Cycle")
79 * and #14 ("Enabling and Disabling Manual Throttle"), plus
80 * erratum #5 ("STPCLK# Deassertion Time") from the January
81 * 2002 PIIX4 specification update. Applies to only older
82 * PIIX4 models.
83 */
84 errata.piix4.throttle = 1;
85
86 case 2: /* PIIX4E */
87 case 3: /* PIIX4M */
88 /*
89 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
90 * Livelock") from the January 2002 PIIX4 specification update.
91 * Applies to all PIIX4 models.
92 */
93
94 /*
95 * BM-IDE
96 * ------
97 * Find the PIIX4 IDE Controller and get the Bus Master IDE
98 * Status register address. We'll use this later to read
99 * each IDE controller's DMA status to make sure we catch all
100 * DMA activity.
101 */
102 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
103 PCI_DEVICE_ID_INTEL_82371AB,
104 PCI_ANY_ID, PCI_ANY_ID, NULL);
105 if (dev) {
106 errata.piix4.bmisx = pci_resource_start(dev, 4);
107 pci_dev_put(dev);
108 }
109
110 /*
111 * Type-F DMA
112 * ----------
113 * Find the PIIX4 ISA Controller and read the Motherboard
114 * DMA controller's status to see if Type-F (Fast) DMA mode
115 * is enabled (bit 7) on either channel. Note that we'll
116 * disable C3 support if this is enabled, as some legacy
117 * devices won't operate well if fast DMA is disabled.
118 */
119 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
120 PCI_DEVICE_ID_INTEL_82371AB_0,
121 PCI_ANY_ID, PCI_ANY_ID, NULL);
122 if (dev) {
123 pci_read_config_byte(dev, 0x76, &value1);
124 pci_read_config_byte(dev, 0x77, &value2);
125 if ((value1 & 0x80) || (value2 & 0x80))
126 errata.piix4.fdma = 1;
127 pci_dev_put(dev);
128 }
129
130 break;
131 }
132
133 if (errata.piix4.bmisx)
134 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
135 "Bus master activity detection (BM-IDE) erratum enabled\n"));
136 if (errata.piix4.fdma)
137 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
138 "Type-F DMA livelock erratum (C3 disabled)\n"));
139
140 return 0;
141}
142
Hanjun Guo082e12a2013-09-02 11:57:38 +0800143static int acpi_processor_errata(void)
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200144{
145 int result = 0;
146 struct pci_dev *dev = NULL;
147
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200148 /*
149 * PIIX4
150 */
151 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
152 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
153 PCI_ANY_ID, NULL);
154 if (dev) {
155 result = acpi_processor_errata_piix4(dev);
156 pci_dev_put(dev);
157 }
158
159 return result;
160}
161
162/* --------------------------------------------------------------------------
163 Initialization
164 -------------------------------------------------------------------------- */
165
166#ifdef CONFIG_ACPI_HOTPLUG_CPU
Ashwin Chaugule56cdc2a2015-09-09 16:27:06 -0400167int __weak acpi_map_cpu(acpi_handle handle,
168 phys_cpuid_t physid, int *pcpu)
169{
170 return -ENODEV;
171}
172
173int __weak acpi_unmap_cpu(int cpu)
174{
175 return -ENODEV;
176}
177
178int __weak arch_register_cpu(int cpu)
179{
180 return -ENODEV;
181}
182
183void __weak arch_unregister_cpu(int cpu) {}
184
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200185static int acpi_processor_hotadd_init(struct acpi_processor *pr)
186{
187 unsigned long long sta;
188 acpi_status status;
189 int ret;
190
Hanjun Guoddcc18f2015-05-13 16:19:30 +0800191 if (invalid_phys_cpuid(pr->phys_id))
Lan Tianyu4985c322014-04-30 15:46:33 +0800192 return -ENODEV;
193
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200194 status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
195 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
196 return -ENODEV;
197
Toshi Kanib9d10be2013-08-12 09:45:53 -0600198 cpu_maps_update_begin();
199 cpu_hotplug_begin();
200
Hanjun Guod02dc272015-01-04 18:55:03 +0800201 ret = acpi_map_cpu(pr->handle, pr->phys_id, &pr->id);
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200202 if (ret)
Toshi Kanib9d10be2013-08-12 09:45:53 -0600203 goto out;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200204
205 ret = arch_register_cpu(pr->id);
206 if (ret) {
Hanjun Guod02dc272015-01-04 18:55:03 +0800207 acpi_unmap_cpu(pr->id);
Toshi Kanib9d10be2013-08-12 09:45:53 -0600208 goto out;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200209 }
210
211 /*
212 * CPU got hot-added, but cpu_data is not initialized yet. Set a flag
213 * to delay cpu_idle/throttling initialization and do it when the CPU
214 * gets online for the first time.
215 */
216 pr_info("CPU%d has been hot-added\n", pr->id);
217 pr->flags.need_hotplug_init = 1;
Toshi Kanib9d10be2013-08-12 09:45:53 -0600218
219out:
220 cpu_hotplug_done();
221 cpu_maps_update_done();
222 return ret;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200223}
224#else
225static inline int acpi_processor_hotadd_init(struct acpi_processor *pr)
226{
227 return -ENODEV;
228}
229#endif /* CONFIG_ACPI_HOTPLUG_CPU */
230
231static int acpi_processor_get_info(struct acpi_device *device)
232{
233 union acpi_object object = { 0 };
234 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
235 struct acpi_processor *pr = acpi_driver_data(device);
Hanjun Guo05eb3cd2015-05-11 12:17:16 +0800236 int device_declaration = 0;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200237 acpi_status status = AE_OK;
238 static int cpu0_initialized;
Zhang Rui6ebb5bc2013-09-03 08:32:09 +0800239 unsigned long long value;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200240
Hanjun Guo082e12a2013-09-02 11:57:38 +0800241 acpi_processor_errata();
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200242
243 /*
244 * Check to see if we have bus mastering arbitration control. This
245 * is required for proper C3 usage (to maintain cache coherency).
246 */
247 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
248 pr->flags.bm_control = 1;
249 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
250 "Bus mastering arbitration control present\n"));
251 } else
252 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
253 "No bus mastering arbitration control\n"));
254
255 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
256 /* Declared with "Processor" statement; match ProcessorID */
257 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
258 if (ACPI_FAILURE(status)) {
259 dev_err(&device->dev,
260 "Failed to evaluate processor object (0x%x)\n",
261 status);
262 return -ENODEV;
263 }
264
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200265 pr->acpi_id = object.processor.proc_id;
266 } else {
267 /*
268 * Declared with "Device" statement; match _UID.
269 * Note that we don't handle string _UIDs yet.
270 */
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200271 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
272 NULL, &value);
273 if (ACPI_FAILURE(status)) {
274 dev_err(&device->dev,
275 "Failed to evaluate processor _UID (0x%x)\n",
276 status);
277 return -ENODEV;
278 }
279 device_declaration = 1;
280 pr->acpi_id = value;
281 }
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200282
Hanjun Guo8416c5b2015-05-11 12:17:17 +0800283 pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,
284 pr->acpi_id);
Hanjun Guoddcc18f2015-05-13 16:19:30 +0800285 if (invalid_phys_cpuid(pr->phys_id))
Hanjun Guoaf8f3f52015-01-04 18:55:02 +0800286 acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n");
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200287
Hanjun Guo05eb3cd2015-05-11 12:17:16 +0800288 pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id);
Graeme Gregoryb50154d2014-07-18 18:02:53 +0800289 if (!cpu0_initialized && !acpi_has_cpu_in_madt()) {
Jiang Liub9815132014-01-09 16:15:19 +0800290 cpu0_initialized = 1;
Hanjun Guoaf8f3f52015-01-04 18:55:02 +0800291 /*
292 * Handle UP system running SMP kernel, with no CPU
293 * entry in MADT
294 */
Hanjun Guo05eb3cd2015-05-11 12:17:16 +0800295 if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1))
296 pr->id = 0;
Jiang Liub9815132014-01-09 16:15:19 +0800297 }
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200298
299 /*
300 * Extra Processor objects may be enumerated on MP systems with
301 * less than the max # of CPUs. They should be ignored _iff
302 * they are physically not present.
303 */
Hanjun Guo25956b62015-05-11 12:17:13 +0800304 if (invalid_logical_cpuid(pr->id)) {
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200305 int ret = acpi_processor_hotadd_init(pr);
306 if (ret)
307 return ret;
308 }
Jiang Liub9815132014-01-09 16:15:19 +0800309
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200310 /*
311 * On some boxes several processors use the same processor bus id.
312 * But they are located in different scope. For example:
313 * \_SB.SCK0.CPU0
314 * \_SB.SCK1.CPU0
315 * Rename the processor device bus id. And the new bus id will be
316 * generated as the following format:
317 * CPU+CPU ID.
318 */
319 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
320 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
321 pr->acpi_id));
322
323 if (!object.processor.pblk_address)
324 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
325 else if (object.processor.pblk_length != 6)
326 dev_err(&device->dev, "Invalid PBLK length [%d]\n",
327 object.processor.pblk_length);
328 else {
329 pr->throttling.address = object.processor.pblk_address;
330 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
331 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
332
333 pr->pblk = object.processor.pblk_address;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200334 }
335
336 /*
337 * If ACPI describes a slot number for this CPU, we can use it to
338 * ensure we get the right value in the "physical id" field
339 * of /proc/cpuinfo
340 */
Zhang Rui6ebb5bc2013-09-03 08:32:09 +0800341 status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value);
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200342 if (ACPI_SUCCESS(status))
Zhang Rui6ebb5bc2013-09-03 08:32:09 +0800343 arch_fix_phys_package_id(pr->id, value);
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200344
345 return 0;
346}
347
348/*
349 * Do not put anything in here which needs the core to be online.
350 * For example MSR access or setting up things which check for cpuinfo_x86
351 * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
352 * Such things have to be put in and set up by the processor driver's .probe().
353 */
354static DEFINE_PER_CPU(void *, processor_device_array);
355
Paul Gortmakerfe7bf102013-06-19 14:30:58 -0400356static int acpi_processor_add(struct acpi_device *device,
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200357 const struct acpi_device_id *id)
358{
359 struct acpi_processor *pr;
360 struct device *dev;
361 int result = 0;
362
363 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
364 if (!pr)
365 return -ENOMEM;
366
367 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
368 result = -ENOMEM;
369 goto err_free_pr;
370 }
371
372 pr->handle = device->handle;
373 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
374 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
375 device->driver_data = pr;
376
377 result = acpi_processor_get_info(device);
378 if (result) /* Processor is not physically present or unavailable */
379 return 0;
380
381#ifdef CONFIG_SMP
382 if (pr->id >= setup_max_cpus && pr->id != 0)
383 return 0;
384#endif
385
386 BUG_ON(pr->id >= nr_cpu_ids);
387
388 /*
389 * Buggy BIOS check.
390 * ACPI id of processors can be reported wrongly by the BIOS.
391 * Don't trust it blindly
392 */
393 if (per_cpu(processor_device_array, pr->id) != NULL &&
394 per_cpu(processor_device_array, pr->id) != device) {
395 dev_warn(&device->dev,
396 "BIOS reported wrong ACPI id %d for the processor\n",
397 pr->id);
398 /* Give up, but do not abort the namespace scan. */
399 goto err;
400 }
401 /*
402 * processor_device_array is not cleared on errors to allow buggy BIOS
403 * checks.
404 */
405 per_cpu(processor_device_array, pr->id) = device;
Rafael J. Wysocki2e4f1db2013-05-30 21:55:46 +0200406 per_cpu(processors, pr->id) = pr;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200407
408 dev = get_cpu_device(pr->id);
Hanjun Guo173a5a42013-05-31 11:36:08 +0800409 if (!dev) {
410 result = -ENODEV;
411 goto err;
412 }
413
Rafael J. Wysocki24dee1f2013-11-29 16:27:43 +0100414 result = acpi_bind_one(dev, device);
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200415 if (result)
416 goto err;
417
418 pr->dev = dev;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200419
420 /* Trigger the processor driver's .probe() if present. */
421 if (device_attach(dev) >= 0)
422 return 1;
423
424 dev_err(dev, "Processor driver could not be attached\n");
425 acpi_unbind_one(dev);
426
427 err:
428 free_cpumask_var(pr->throttling.shared_cpu_map);
429 device->driver_data = NULL;
Rafael J. Wysocki2e4f1db2013-05-30 21:55:46 +0200430 per_cpu(processors, pr->id) = NULL;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200431 err_free_pr:
432 kfree(pr);
433 return result;
434}
435
436#ifdef CONFIG_ACPI_HOTPLUG_CPU
437/* --------------------------------------------------------------------------
438 Removal
439 -------------------------------------------------------------------------- */
440
441static void acpi_processor_remove(struct acpi_device *device)
442{
443 struct acpi_processor *pr;
444
445 if (!device || !acpi_driver_data(device))
446 return;
447
448 pr = acpi_driver_data(device);
449 if (pr->id >= nr_cpu_ids)
450 goto out;
451
452 /*
453 * The only reason why we ever get here is CPU hot-removal. The CPU is
454 * already offline and the ACPI device removal locking prevents it from
455 * being put back online at this point.
456 *
457 * Unbind the driver from the processor device and detach it from the
458 * ACPI companion object.
459 */
460 device_release_driver(pr->dev);
461 acpi_unbind_one(pr->dev);
462
463 /* Clean up. */
464 per_cpu(processor_device_array, pr->id) = NULL;
Rafael J. Wysocki2e4f1db2013-05-30 21:55:46 +0200465 per_cpu(processors, pr->id) = NULL;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200466
Toshi Kanib9d10be2013-08-12 09:45:53 -0600467 cpu_maps_update_begin();
468 cpu_hotplug_begin();
469
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200470 /* Remove the CPU. */
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200471 arch_unregister_cpu(pr->id);
Hanjun Guod02dc272015-01-04 18:55:03 +0800472 acpi_unmap_cpu(pr->id);
Toshi Kanib9d10be2013-08-12 09:45:53 -0600473
474 cpu_hotplug_done();
475 cpu_maps_update_done();
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200476
Yasuaki Ishimatsu1e385f62013-08-06 19:11:11 +0900477 try_offline_node(cpu_to_node(pr->id));
478
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200479 out:
480 free_cpumask_var(pr->throttling.shared_cpu_map);
481 kfree(pr);
482}
483#endif /* CONFIG_ACPI_HOTPLUG_CPU */
484
Srinivas Pandruvadaa2121162016-03-23 21:07:39 -0700485#ifdef CONFIG_X86
486static bool acpi_hwp_native_thermal_lvt_set;
487static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
488 u32 lvl,
489 void *context,
490 void **rv)
491{
492 u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953";
493 u32 capbuf[2];
494 struct acpi_osc_context osc_context = {
495 .uuid_str = sb_uuid_str,
496 .rev = 1,
497 .cap.length = 8,
498 .cap.pointer = capbuf,
499 };
500
501 if (acpi_hwp_native_thermal_lvt_set)
502 return AE_CTRL_TERMINATE;
503
504 capbuf[0] = 0x0000;
505 capbuf[1] = 0x1000; /* set bit 12 */
506
507 if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) {
508 if (osc_context.ret.pointer && osc_context.ret.length > 1) {
509 u32 *capbuf_ret = osc_context.ret.pointer;
510
511 if (capbuf_ret[1] & 0x1000) {
512 acpi_handle_info(handle,
513 "_OSC native thermal LVT Acked\n");
514 acpi_hwp_native_thermal_lvt_set = true;
515 }
516 }
517 kfree(osc_context.ret.pointer);
518 }
519
520 return AE_OK;
521}
522
523void __init acpi_early_processor_osc(void)
524{
525 if (boot_cpu_has(X86_FEATURE_HWP)) {
526 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
527 ACPI_UINT32_MAX,
528 acpi_hwp_native_thermal_lvt_osc,
529 NULL, NULL, NULL);
530 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID,
531 acpi_hwp_native_thermal_lvt_osc,
532 NULL, NULL);
533 }
534}
535#endif
536
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200537/*
538 * The following ACPI IDs are known to be suitable for representing as
539 * processor devices.
540 */
541static const struct acpi_device_id processor_device_ids[] = {
542
543 { ACPI_PROCESSOR_OBJECT_HID, },
544 { ACPI_PROCESSOR_DEVICE_HID, },
545
546 { }
547};
548
Mathias Krause8ce344c2015-07-19 18:50:38 +0200549static struct acpi_scan_handler processor_handler = {
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200550 .ids = processor_device_ids,
551 .attach = acpi_processor_add,
552#ifdef CONFIG_ACPI_HOTPLUG_CPU
553 .detach = acpi_processor_remove,
554#endif
555 .hotplug = {
556 .enabled = true,
557 },
558};
559
Sudeep Holladb62fda2016-02-17 11:54:19 +0000560static int acpi_processor_container_attach(struct acpi_device *dev,
561 const struct acpi_device_id *id)
562{
563 return 1;
564}
565
566static const struct acpi_device_id processor_container_ids[] = {
567 { ACPI_PROCESSOR_CONTAINER_HID, },
568 { }
569};
570
571static struct acpi_scan_handler processor_container_handler = {
572 .ids = processor_container_ids,
573 .attach = acpi_processor_container_attach,
574};
575
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200576void __init acpi_processor_init(void)
577{
578 acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
Sudeep Holladb62fda2016-02-17 11:54:19 +0000579 acpi_scan_add_handler(&processor_container_handler);
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200580}