Merge tag 'for-5.3-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[linux-block.git] / drivers / acpi / acpi_processor.c
CommitLineData
d2912cb1 1// SPDX-License-Identifier: GPL-2.0-only
ac212b69
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2/*
3 * acpi_processor.c - ACPI processor enumeration support
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
8 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
9 * Copyright (C) 2013, Intel Corporation
10 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
ac212b69
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11 */
12
13#include <linux/acpi.h>
14#include <linux/device.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/pci.h>
18
19#include <acpi/processor.h>
20
21#include <asm/cpu.h>
22
23#include "internal.h"
24
25#define _COMPONENT ACPI_PROCESSOR_COMPONENT
26
27ACPI_MODULE_NAME("processor");
28
2e4f1db4
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29DEFINE_PER_CPU(struct acpi_processor *, processors);
30EXPORT_PER_CPU_SYMBOL(processors);
31
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32/* --------------------------------------------------------------------------
33 Errata Handling
34 -------------------------------------------------------------------------- */
35
36struct acpi_processor_errata errata __read_mostly;
37EXPORT_SYMBOL_GPL(errata);
38
39static int acpi_processor_errata_piix4(struct pci_dev *dev)
40{
41 u8 value1 = 0;
42 u8 value2 = 0;
43
44
45 if (!dev)
46 return -EINVAL;
47
48 /*
49 * Note that 'dev' references the PIIX4 ACPI Controller.
50 */
51
52 switch (dev->revision) {
53 case 0:
54 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
55 break;
56 case 1:
57 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
58 break;
59 case 2:
60 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
61 break;
62 case 3:
63 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
64 break;
65 default:
66 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
67 break;
68 }
69
70 switch (dev->revision) {
71
72 case 0: /* PIIX4 A-step */
73 case 1: /* PIIX4 B-step */
74 /*
75 * See specification changes #13 ("Manual Throttle Duty Cycle")
76 * and #14 ("Enabling and Disabling Manual Throttle"), plus
77 * erratum #5 ("STPCLK# Deassertion Time") from the January
78 * 2002 PIIX4 specification update. Applies to only older
79 * PIIX4 models.
80 */
81 errata.piix4.throttle = 1;
1be9c3a0 82 /* fall through*/
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83
84 case 2: /* PIIX4E */
85 case 3: /* PIIX4M */
86 /*
87 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
88 * Livelock") from the January 2002 PIIX4 specification update.
89 * Applies to all PIIX4 models.
90 */
91
92 /*
93 * BM-IDE
94 * ------
95 * Find the PIIX4 IDE Controller and get the Bus Master IDE
96 * Status register address. We'll use this later to read
97 * each IDE controller's DMA status to make sure we catch all
98 * DMA activity.
99 */
100 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
101 PCI_DEVICE_ID_INTEL_82371AB,
102 PCI_ANY_ID, PCI_ANY_ID, NULL);
103 if (dev) {
104 errata.piix4.bmisx = pci_resource_start(dev, 4);
105 pci_dev_put(dev);
106 }
107
108 /*
109 * Type-F DMA
110 * ----------
111 * Find the PIIX4 ISA Controller and read the Motherboard
112 * DMA controller's status to see if Type-F (Fast) DMA mode
113 * is enabled (bit 7) on either channel. Note that we'll
114 * disable C3 support if this is enabled, as some legacy
115 * devices won't operate well if fast DMA is disabled.
116 */
117 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
118 PCI_DEVICE_ID_INTEL_82371AB_0,
119 PCI_ANY_ID, PCI_ANY_ID, NULL);
120 if (dev) {
121 pci_read_config_byte(dev, 0x76, &value1);
122 pci_read_config_byte(dev, 0x77, &value2);
123 if ((value1 & 0x80) || (value2 & 0x80))
124 errata.piix4.fdma = 1;
125 pci_dev_put(dev);
126 }
127
128 break;
129 }
130
131 if (errata.piix4.bmisx)
132 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
133 "Bus master activity detection (BM-IDE) erratum enabled\n"));
134 if (errata.piix4.fdma)
135 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
136 "Type-F DMA livelock erratum (C3 disabled)\n"));
137
138 return 0;
139}
140
082e12a0 141static int acpi_processor_errata(void)
ac212b69
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142{
143 int result = 0;
144 struct pci_dev *dev = NULL;
145
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146 /*
147 * PIIX4
148 */
149 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
150 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
151 PCI_ANY_ID, NULL);
152 if (dev) {
153 result = acpi_processor_errata_piix4(dev);
154 pci_dev_put(dev);
155 }
156
157 return result;
158}
159
160/* --------------------------------------------------------------------------
161 Initialization
162 -------------------------------------------------------------------------- */
163
164#ifdef CONFIG_ACPI_HOTPLUG_CPU
56cdc2a0 165int __weak acpi_map_cpu(acpi_handle handle,
febf2407 166 phys_cpuid_t physid, u32 acpi_id, int *pcpu)
56cdc2a0
AC
167{
168 return -ENODEV;
169}
170
171int __weak acpi_unmap_cpu(int cpu)
172{
173 return -ENODEV;
174}
175
176int __weak arch_register_cpu(int cpu)
177{
178 return -ENODEV;
179}
180
181void __weak arch_unregister_cpu(int cpu) {}
182
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183static int acpi_processor_hotadd_init(struct acpi_processor *pr)
184{
185 unsigned long long sta;
186 acpi_status status;
187 int ret;
188
ddcc18f5 189 if (invalid_phys_cpuid(pr->phys_id))
4985c32e
LT
190 return -ENODEV;
191
ac212b69
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192 status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
193 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
194 return -ENODEV;
195
b9d10be7
TK
196 cpu_maps_update_begin();
197 cpu_hotplug_begin();
198
febf2407 199 ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id);
ac212b69 200 if (ret)
b9d10be7 201 goto out;
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202
203 ret = arch_register_cpu(pr->id);
204 if (ret) {
d02dc27d 205 acpi_unmap_cpu(pr->id);
b9d10be7 206 goto out;
ac212b69
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207 }
208
209 /*
210 * CPU got hot-added, but cpu_data is not initialized yet. Set a flag
211 * to delay cpu_idle/throttling initialization and do it when the CPU
212 * gets online for the first time.
213 */
214 pr_info("CPU%d has been hot-added\n", pr->id);
215 pr->flags.need_hotplug_init = 1;
b9d10be7
TK
216
217out:
218 cpu_hotplug_done();
219 cpu_maps_update_done();
220 return ret;
ac212b69
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221}
222#else
223static inline int acpi_processor_hotadd_init(struct acpi_processor *pr)
224{
225 return -ENODEV;
226}
227#endif /* CONFIG_ACPI_HOTPLUG_CPU */
228
229static int acpi_processor_get_info(struct acpi_device *device)
230{
231 union acpi_object object = { 0 };
232 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
233 struct acpi_processor *pr = acpi_driver_data(device);
05eb3cd8 234 int device_declaration = 0;
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235 acpi_status status = AE_OK;
236 static int cpu0_initialized;
6ebb5bc9 237 unsigned long long value;
ac212b69 238
082e12a0 239 acpi_processor_errata();
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240
241 /*
242 * Check to see if we have bus mastering arbitration control. This
243 * is required for proper C3 usage (to maintain cache coherency).
244 */
245 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
246 pr->flags.bm_control = 1;
247 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
248 "Bus mastering arbitration control present\n"));
249 } else
250 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
251 "No bus mastering arbitration control\n"));
252
253 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
254 /* Declared with "Processor" statement; match ProcessorID */
255 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
256 if (ACPI_FAILURE(status)) {
257 dev_err(&device->dev,
258 "Failed to evaluate processor object (0x%x)\n",
259 status);
260 return -ENODEV;
261 }
262
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263 pr->acpi_id = object.processor.proc_id;
264 } else {
265 /*
266 * Declared with "Device" statement; match _UID.
267 * Note that we don't handle string _UIDs yet.
268 */
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269 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
270 NULL, &value);
271 if (ACPI_FAILURE(status)) {
272 dev_err(&device->dev,
273 "Failed to evaluate processor _UID (0x%x)\n",
274 status);
275 return -ENODEV;
276 }
277 device_declaration = 1;
278 pr->acpi_id = value;
279 }
ac212b69 280
a77d6cd9
DL
281 if (acpi_duplicate_processor_id(pr->acpi_id)) {
282 dev_err(&device->dev,
283 "Failed to get unique processor _UID (0x%x)\n",
284 pr->acpi_id);
285 return -ENODEV;
286 }
287
8416c5bd
HG
288 pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,
289 pr->acpi_id);
ddcc18f5 290 if (invalid_phys_cpuid(pr->phys_id))
af8f3f51 291 acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n");
ac212b69 292
05eb3cd8 293 pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id);
b50154d5 294 if (!cpu0_initialized && !acpi_has_cpu_in_madt()) {
b981513f 295 cpu0_initialized = 1;
af8f3f51
HG
296 /*
297 * Handle UP system running SMP kernel, with no CPU
298 * entry in MADT
299 */
05eb3cd8
HG
300 if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1))
301 pr->id = 0;
b981513f 302 }
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303
304 /*
305 * Extra Processor objects may be enumerated on MP systems with
306 * less than the max # of CPUs. They should be ignored _iff
307 * they are physically not present.
8ad893fa
GZ
308 *
309 * NOTE: Even if the processor has a cpuid, it may not be present
310 * because cpuid <-> apicid mapping is persistent now.
ac212b69 311 */
8ad893fa 312 if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) {
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313 int ret = acpi_processor_hotadd_init(pr);
314 if (ret)
315 return ret;
316 }
b981513f 317
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318 /*
319 * On some boxes several processors use the same processor bus id.
320 * But they are located in different scope. For example:
321 * \_SB.SCK0.CPU0
322 * \_SB.SCK1.CPU0
323 * Rename the processor device bus id. And the new bus id will be
324 * generated as the following format:
325 * CPU+CPU ID.
326 */
327 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
328 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
329 pr->acpi_id));
330
331 if (!object.processor.pblk_address)
332 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
333 else if (object.processor.pblk_length != 6)
334 dev_err(&device->dev, "Invalid PBLK length [%d]\n",
335 object.processor.pblk_length);
336 else {
337 pr->throttling.address = object.processor.pblk_address;
338 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
339 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
340
341 pr->pblk = object.processor.pblk_address;
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342 }
343
344 /*
345 * If ACPI describes a slot number for this CPU, we can use it to
346 * ensure we get the right value in the "physical id" field
347 * of /proc/cpuinfo
348 */
6ebb5bc9 349 status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value);
ac212b69 350 if (ACPI_SUCCESS(status))
6ebb5bc9 351 arch_fix_phys_package_id(pr->id, value);
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352
353 return 0;
354}
355
356/*
357 * Do not put anything in here which needs the core to be online.
358 * For example MSR access or setting up things which check for cpuinfo_x86
359 * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
360 * Such things have to be put in and set up by the processor driver's .probe().
361 */
362static DEFINE_PER_CPU(void *, processor_device_array);
363
fe7bf106 364static int acpi_processor_add(struct acpi_device *device,
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365 const struct acpi_device_id *id)
366{
367 struct acpi_processor *pr;
368 struct device *dev;
369 int result = 0;
370
371 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
372 if (!pr)
373 return -ENOMEM;
374
375 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
376 result = -ENOMEM;
377 goto err_free_pr;
378 }
379
380 pr->handle = device->handle;
381 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
382 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
383 device->driver_data = pr;
384
385 result = acpi_processor_get_info(device);
386 if (result) /* Processor is not physically present or unavailable */
387 return 0;
388
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389 BUG_ON(pr->id >= nr_cpu_ids);
390
391 /*
392 * Buggy BIOS check.
393 * ACPI id of processors can be reported wrongly by the BIOS.
394 * Don't trust it blindly
395 */
396 if (per_cpu(processor_device_array, pr->id) != NULL &&
397 per_cpu(processor_device_array, pr->id) != device) {
398 dev_warn(&device->dev,
399 "BIOS reported wrong ACPI id %d for the processor\n",
400 pr->id);
401 /* Give up, but do not abort the namespace scan. */
402 goto err;
403 }
404 /*
405 * processor_device_array is not cleared on errors to allow buggy BIOS
406 * checks.
407 */
408 per_cpu(processor_device_array, pr->id) = device;
2e4f1db4 409 per_cpu(processors, pr->id) = pr;
ac212b69
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410
411 dev = get_cpu_device(pr->id);
173a5a4c
HG
412 if (!dev) {
413 result = -ENODEV;
414 goto err;
415 }
416
24dee1fc 417 result = acpi_bind_one(dev, device);
ac212b69
RW
418 if (result)
419 goto err;
420
421 pr->dev = dev;
ac212b69
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422
423 /* Trigger the processor driver's .probe() if present. */
424 if (device_attach(dev) >= 0)
425 return 1;
426
427 dev_err(dev, "Processor driver could not be attached\n");
428 acpi_unbind_one(dev);
429
430 err:
431 free_cpumask_var(pr->throttling.shared_cpu_map);
432 device->driver_data = NULL;
2e4f1db4 433 per_cpu(processors, pr->id) = NULL;
ac212b69
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434 err_free_pr:
435 kfree(pr);
436 return result;
437}
438
439#ifdef CONFIG_ACPI_HOTPLUG_CPU
440/* --------------------------------------------------------------------------
441 Removal
442 -------------------------------------------------------------------------- */
443
444static void acpi_processor_remove(struct acpi_device *device)
445{
446 struct acpi_processor *pr;
447
448 if (!device || !acpi_driver_data(device))
449 return;
450
451 pr = acpi_driver_data(device);
452 if (pr->id >= nr_cpu_ids)
453 goto out;
454
455 /*
456 * The only reason why we ever get here is CPU hot-removal. The CPU is
457 * already offline and the ACPI device removal locking prevents it from
458 * being put back online at this point.
459 *
460 * Unbind the driver from the processor device and detach it from the
461 * ACPI companion object.
462 */
463 device_release_driver(pr->dev);
464 acpi_unbind_one(pr->dev);
465
466 /* Clean up. */
467 per_cpu(processor_device_array, pr->id) = NULL;
2e4f1db4 468 per_cpu(processors, pr->id) = NULL;
ac212b69 469
b9d10be7
TK
470 cpu_maps_update_begin();
471 cpu_hotplug_begin();
472
ac212b69 473 /* Remove the CPU. */
ac212b69 474 arch_unregister_cpu(pr->id);
d02dc27d 475 acpi_unmap_cpu(pr->id);
b9d10be7
TK
476
477 cpu_hotplug_done();
478 cpu_maps_update_done();
ac212b69 479
1e385f6f
YI
480 try_offline_node(cpu_to_node(pr->id));
481
ac212b69
RW
482 out:
483 free_cpumask_var(pr->throttling.shared_cpu_map);
484 kfree(pr);
485}
486#endif /* CONFIG_ACPI_HOTPLUG_CPU */
487
a2121167
SP
488#ifdef CONFIG_X86
489static bool acpi_hwp_native_thermal_lvt_set;
490static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
491 u32 lvl,
492 void *context,
493 void **rv)
494{
495 u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953";
496 u32 capbuf[2];
497 struct acpi_osc_context osc_context = {
498 .uuid_str = sb_uuid_str,
499 .rev = 1,
500 .cap.length = 8,
501 .cap.pointer = capbuf,
502 };
503
504 if (acpi_hwp_native_thermal_lvt_set)
505 return AE_CTRL_TERMINATE;
506
507 capbuf[0] = 0x0000;
508 capbuf[1] = 0x1000; /* set bit 12 */
509
510 if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) {
511 if (osc_context.ret.pointer && osc_context.ret.length > 1) {
512 u32 *capbuf_ret = osc_context.ret.pointer;
513
514 if (capbuf_ret[1] & 0x1000) {
515 acpi_handle_info(handle,
516 "_OSC native thermal LVT Acked\n");
517 acpi_hwp_native_thermal_lvt_set = true;
518 }
519 }
520 kfree(osc_context.ret.pointer);
521 }
522
523 return AE_OK;
524}
525
526void __init acpi_early_processor_osc(void)
527{
528 if (boot_cpu_has(X86_FEATURE_HWP)) {
529 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
530 ACPI_UINT32_MAX,
531 acpi_hwp_native_thermal_lvt_osc,
532 NULL, NULL, NULL);
533 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID,
534 acpi_hwp_native_thermal_lvt_osc,
535 NULL, NULL);
536 }
537}
538#endif
539
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540/*
541 * The following ACPI IDs are known to be suitable for representing as
542 * processor devices.
543 */
544static const struct acpi_device_id processor_device_ids[] = {
545
546 { ACPI_PROCESSOR_OBJECT_HID, },
547 { ACPI_PROCESSOR_DEVICE_HID, },
548
549 { }
550};
551
8ce344c6 552static struct acpi_scan_handler processor_handler = {
ac212b69
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553 .ids = processor_device_ids,
554 .attach = acpi_processor_add,
555#ifdef CONFIG_ACPI_HOTPLUG_CPU
556 .detach = acpi_processor_remove,
557#endif
558 .hotplug = {
559 .enabled = true,
560 },
561};
562
db62fda3
SH
563static int acpi_processor_container_attach(struct acpi_device *dev,
564 const struct acpi_device_id *id)
565{
566 return 1;
567}
568
569static const struct acpi_device_id processor_container_ids[] = {
570 { ACPI_PROCESSOR_CONTAINER_HID, },
571 { }
572};
573
574static struct acpi_scan_handler processor_container_handler = {
575 .ids = processor_container_ids,
576 .attach = acpi_processor_container_attach,
577};
578
8e089eaa
DL
579/* The number of the unique processor IDs */
580static int nr_unique_ids __initdata;
581
582/* The number of the duplicate processor IDs */
a77d6cd9 583static int nr_duplicate_ids;
8e089eaa
DL
584
585/* Used to store the unique processor IDs */
586static int unique_processor_ids[] __initdata = {
587 [0 ... NR_CPUS - 1] = -1,
588};
589
590/* Used to store the duplicate processor IDs */
a77d6cd9 591static int duplicate_processor_ids[] = {
8e089eaa
DL
592 [0 ... NR_CPUS - 1] = -1,
593};
594
595static void __init processor_validated_ids_update(int proc_id)
596{
597 int i;
598
599 if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS)
600 return;
601
602 /*
603 * Firstly, compare the proc_id with duplicate IDs, if the proc_id is
604 * already in the IDs, do nothing.
605 */
606 for (i = 0; i < nr_duplicate_ids; i++) {
607 if (duplicate_processor_ids[i] == proc_id)
608 return;
609 }
610
611 /*
612 * Secondly, compare the proc_id with unique IDs, if the proc_id is in
613 * the IDs, put it in the duplicate IDs.
614 */
615 for (i = 0; i < nr_unique_ids; i++) {
616 if (unique_processor_ids[i] == proc_id) {
617 duplicate_processor_ids[nr_duplicate_ids] = proc_id;
618 nr_duplicate_ids++;
619 return;
620 }
621 }
622
623 /*
624 * Lastly, the proc_id is a unique ID, put it in the unique IDs.
625 */
626 unique_processor_ids[nr_unique_ids] = proc_id;
627 nr_unique_ids++;
628}
629
630static acpi_status __init acpi_processor_ids_walk(acpi_handle handle,
631 u32 lvl,
632 void *context,
633 void **rv)
634{
635 acpi_status status;
8c8cb30f
DL
636 acpi_object_type acpi_type;
637 unsigned long long uid;
8e089eaa
DL
638 union acpi_object object = { 0 };
639 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
640
8c8cb30f 641 status = acpi_get_type(handle, &acpi_type);
8e089eaa 642 if (ACPI_FAILURE(status))
d0381bf4 643 return status;
8c8cb30f
DL
644
645 switch (acpi_type) {
646 case ACPI_TYPE_PROCESSOR:
647 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
648 if (ACPI_FAILURE(status))
649 goto err;
650 uid = object.processor.proc_id;
651 break;
652
653 case ACPI_TYPE_DEVICE:
654 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
655 if (ACPI_FAILURE(status))
656 goto err;
657 break;
658 default:
659 goto err;
660 }
661
662 processor_validated_ids_update(uid);
d0381bf4 663 return AE_OK;
8c8cb30f
DL
664
665err:
d0381bf4 666 /* Exit on error, but don't abort the namespace walk */
8c8cb30f 667 acpi_handle_info(handle, "Invalid processor object\n");
d0381bf4 668 return AE_OK;
8e089eaa 669
8e089eaa
DL
670}
671
0ed780e3 672static void __init acpi_processor_check_duplicates(void)
8e089eaa 673{
8c8cb30f 674 /* check the correctness for all processors in ACPI namespace */
8e089eaa
DL
675 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
676 ACPI_UINT32_MAX,
677 acpi_processor_ids_walk,
678 NULL, NULL, NULL);
8c8cb30f
DL
679 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk,
680 NULL, NULL);
8e089eaa
DL
681}
682
a77d6cd9 683bool acpi_duplicate_processor_id(int proc_id)
fd74da21
DL
684{
685 int i;
686
687 /*
688 * compare the proc_id with duplicate IDs, if the proc_id is already
689 * in the duplicate IDs, return true, otherwise, return false.
690 */
691 for (i = 0; i < nr_duplicate_ids; i++) {
692 if (duplicate_processor_ids[i] == proc_id)
693 return true;
694 }
695 return false;
696}
697
ac212b69
RW
698void __init acpi_processor_init(void)
699{
8e089eaa 700 acpi_processor_check_duplicates();
ac212b69 701 acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
db62fda3 702 acpi_scan_add_handler(&processor_container_handler);
ac212b69 703}