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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
32DEFINE_PER_CPU(struct acpi_processor *, processors);
33EXPORT_PER_CPU_SYMBOL(processors);
34
35
36
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
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:
76 case 1:
77
78
79
80
81
82
83
84 errata.piix4.throttle = 1;
85
86
87 case 2:
88 case 3:
89
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100
101
102
103 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
104 PCI_DEVICE_ID_INTEL_82371AB,
105 PCI_ANY_ID, PCI_ANY_ID, NULL);
106 if (dev) {
107 errata.piix4.bmisx = pci_resource_start(dev, 4);
108 pci_dev_put(dev);
109 }
110
111
112
113
114
115
116
117
118
119
120 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
121 PCI_DEVICE_ID_INTEL_82371AB_0,
122 PCI_ANY_ID, PCI_ANY_ID, NULL);
123 if (dev) {
124 pci_read_config_byte(dev, 0x76, &value1);
125 pci_read_config_byte(dev, 0x77, &value2);
126 if ((value1 & 0x80) || (value2 & 0x80))
127 errata.piix4.fdma = 1;
128 pci_dev_put(dev);
129 }
130
131 break;
132 }
133
134 if (errata.piix4.bmisx)
135 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
136 "Bus master activity detection (BM-IDE) erratum enabled\n"));
137 if (errata.piix4.fdma)
138 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
139 "Type-F DMA livelock erratum (C3 disabled)\n"));
140
141 return 0;
142}
143
144static int acpi_processor_errata(void)
145{
146 int result = 0;
147 struct pci_dev *dev = NULL;
148
149
150
151
152 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
153 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
154 PCI_ANY_ID, NULL);
155 if (dev) {
156 result = acpi_processor_errata_piix4(dev);
157 pci_dev_put(dev);
158 }
159
160 return result;
161}
162
163
164
165
166
167#ifdef CONFIG_ACPI_HOTPLUG_CPU
168int __weak acpi_map_cpu(acpi_handle handle,
169 phys_cpuid_t physid, u32 acpi_id, int *pcpu)
170{
171 return -ENODEV;
172}
173
174int __weak acpi_unmap_cpu(int cpu)
175{
176 return -ENODEV;
177}
178
179int __weak arch_register_cpu(int cpu)
180{
181 return -ENODEV;
182}
183
184void __weak arch_unregister_cpu(int cpu) {}
185
186static int acpi_processor_hotadd_init(struct acpi_processor *pr)
187{
188 unsigned long long sta;
189 acpi_status status;
190 int ret;
191
192 if (invalid_phys_cpuid(pr->phys_id))
193 return -ENODEV;
194
195 status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
196 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
197 return -ENODEV;
198
199 cpu_maps_update_begin();
200 cpu_hotplug_begin();
201
202 ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id);
203 if (ret)
204 goto out;
205
206 ret = arch_register_cpu(pr->id);
207 if (ret) {
208 acpi_unmap_cpu(pr->id);
209 goto out;
210 }
211
212
213
214
215
216
217 pr_info("CPU%d has been hot-added\n", pr->id);
218 pr->flags.need_hotplug_init = 1;
219
220out:
221 cpu_hotplug_done();
222 cpu_maps_update_done();
223 return ret;
224}
225#else
226static inline int acpi_processor_hotadd_init(struct acpi_processor *pr)
227{
228 return -ENODEV;
229}
230#endif
231
232static int acpi_processor_get_info(struct acpi_device *device)
233{
234 union acpi_object object = { 0 };
235 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
236 struct acpi_processor *pr = acpi_driver_data(device);
237 int device_declaration = 0;
238 acpi_status status = AE_OK;
239 static int cpu0_initialized;
240 unsigned long long value;
241
242 acpi_processor_errata();
243
244
245
246
247
248 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
249 pr->flags.bm_control = 1;
250 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
251 "Bus mastering arbitration control present\n"));
252 } else
253 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
254 "No bus mastering arbitration control\n"));
255
256 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
257
258 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
259 if (ACPI_FAILURE(status)) {
260 dev_err(&device->dev,
261 "Failed to evaluate processor object (0x%x)\n",
262 status);
263 return -ENODEV;
264 }
265
266 pr->acpi_id = object.processor.proc_id;
267 } else {
268
269
270
271
272 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
273 NULL, &value);
274 if (ACPI_FAILURE(status)) {
275 dev_err(&device->dev,
276 "Failed to evaluate processor _UID (0x%x)\n",
277 status);
278 return -ENODEV;
279 }
280 device_declaration = 1;
281 pr->acpi_id = value;
282 }
283
284 if (acpi_duplicate_processor_id(pr->acpi_id)) {
285 dev_err(&device->dev,
286 "Failed to get unique processor _UID (0x%x)\n",
287 pr->acpi_id);
288 return -ENODEV;
289 }
290
291 pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,
292 pr->acpi_id);
293 if (invalid_phys_cpuid(pr->phys_id))
294 acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n");
295
296 pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id);
297 if (!cpu0_initialized && !acpi_has_cpu_in_madt()) {
298 cpu0_initialized = 1;
299
300
301
302
303 if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1))
304 pr->id = 0;
305 }
306
307
308
309
310
311
312
313
314
315 if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) {
316 int ret = acpi_processor_hotadd_init(pr);
317 if (ret)
318 return ret;
319 }
320
321
322
323
324
325
326
327
328
329
330 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
331 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
332 pr->acpi_id));
333
334 if (!object.processor.pblk_address)
335 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
336 else if (object.processor.pblk_length != 6)
337 dev_err(&device->dev, "Invalid PBLK length [%d]\n",
338 object.processor.pblk_length);
339 else {
340 pr->throttling.address = object.processor.pblk_address;
341 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
342 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
343
344 pr->pblk = object.processor.pblk_address;
345 }
346
347
348
349
350
351
352 status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value);
353 if (ACPI_SUCCESS(status))
354 arch_fix_phys_package_id(pr->id, value);
355
356 return 0;
357}
358
359
360
361
362
363
364
365static DEFINE_PER_CPU(void *, processor_device_array);
366
367static int acpi_processor_add(struct acpi_device *device,
368 const struct acpi_device_id *id)
369{
370 struct acpi_processor *pr;
371 struct device *dev;
372 int result = 0;
373
374 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
375 if (!pr)
376 return -ENOMEM;
377
378 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
379 result = -ENOMEM;
380 goto err_free_pr;
381 }
382
383 pr->handle = device->handle;
384 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
385 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
386 device->driver_data = pr;
387
388 result = acpi_processor_get_info(device);
389 if (result)
390 return 0;
391
392 BUG_ON(pr->id >= nr_cpu_ids);
393
394
395
396
397
398
399 if (per_cpu(processor_device_array, pr->id) != NULL &&
400 per_cpu(processor_device_array, pr->id) != device) {
401 dev_warn(&device->dev,
402 "BIOS reported wrong ACPI id %d for the processor\n",
403 pr->id);
404
405 goto err;
406 }
407
408
409
410
411 per_cpu(processor_device_array, pr->id) = device;
412 per_cpu(processors, pr->id) = pr;
413
414 dev = get_cpu_device(pr->id);
415 if (!dev) {
416 result = -ENODEV;
417 goto err;
418 }
419
420 result = acpi_bind_one(dev, device);
421 if (result)
422 goto err;
423
424 pr->dev = dev;
425
426
427 if (device_attach(dev) >= 0)
428 return 1;
429
430 dev_err(dev, "Processor driver could not be attached\n");
431 acpi_unbind_one(dev);
432
433 err:
434 free_cpumask_var(pr->throttling.shared_cpu_map);
435 device->driver_data = NULL;
436 per_cpu(processors, pr->id) = NULL;
437 err_free_pr:
438 kfree(pr);
439 return result;
440}
441
442#ifdef CONFIG_ACPI_HOTPLUG_CPU
443
444
445
446
447static void acpi_processor_remove(struct acpi_device *device)
448{
449 struct acpi_processor *pr;
450
451 if (!device || !acpi_driver_data(device))
452 return;
453
454 pr = acpi_driver_data(device);
455 if (pr->id >= nr_cpu_ids)
456 goto out;
457
458
459
460
461
462
463
464
465
466 device_release_driver(pr->dev);
467 acpi_unbind_one(pr->dev);
468
469
470 per_cpu(processor_device_array, pr->id) = NULL;
471 per_cpu(processors, pr->id) = NULL;
472
473 cpu_maps_update_begin();
474 cpu_hotplug_begin();
475
476
477 arch_unregister_cpu(pr->id);
478 acpi_unmap_cpu(pr->id);
479
480 cpu_hotplug_done();
481 cpu_maps_update_done();
482
483 try_offline_node(cpu_to_node(pr->id));
484
485 out:
486 free_cpumask_var(pr->throttling.shared_cpu_map);
487 kfree(pr);
488}
489#endif
490
491#ifdef CONFIG_X86
492static bool acpi_hwp_native_thermal_lvt_set;
493static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
494 u32 lvl,
495 void *context,
496 void **rv)
497{
498 u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953";
499 u32 capbuf[2];
500 struct acpi_osc_context osc_context = {
501 .uuid_str = sb_uuid_str,
502 .rev = 1,
503 .cap.length = 8,
504 .cap.pointer = capbuf,
505 };
506
507 if (acpi_hwp_native_thermal_lvt_set)
508 return AE_CTRL_TERMINATE;
509
510 capbuf[0] = 0x0000;
511 capbuf[1] = 0x1000;
512
513 if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) {
514 if (osc_context.ret.pointer && osc_context.ret.length > 1) {
515 u32 *capbuf_ret = osc_context.ret.pointer;
516
517 if (capbuf_ret[1] & 0x1000) {
518 acpi_handle_info(handle,
519 "_OSC native thermal LVT Acked\n");
520 acpi_hwp_native_thermal_lvt_set = true;
521 }
522 }
523 kfree(osc_context.ret.pointer);
524 }
525
526 return AE_OK;
527}
528
529void __init acpi_early_processor_osc(void)
530{
531 if (boot_cpu_has(X86_FEATURE_HWP)) {
532 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
533 ACPI_UINT32_MAX,
534 acpi_hwp_native_thermal_lvt_osc,
535 NULL, NULL, NULL);
536 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID,
537 acpi_hwp_native_thermal_lvt_osc,
538 NULL, NULL);
539 }
540}
541#endif
542
543
544
545
546
547static const struct acpi_device_id processor_device_ids[] = {
548
549 { ACPI_PROCESSOR_OBJECT_HID, },
550 { ACPI_PROCESSOR_DEVICE_HID, },
551
552 { }
553};
554
555static struct acpi_scan_handler processor_handler = {
556 .ids = processor_device_ids,
557 .attach = acpi_processor_add,
558#ifdef CONFIG_ACPI_HOTPLUG_CPU
559 .detach = acpi_processor_remove,
560#endif
561 .hotplug = {
562 .enabled = true,
563 },
564};
565
566static int acpi_processor_container_attach(struct acpi_device *dev,
567 const struct acpi_device_id *id)
568{
569 return 1;
570}
571
572static const struct acpi_device_id processor_container_ids[] = {
573 { ACPI_PROCESSOR_CONTAINER_HID, },
574 { }
575};
576
577static struct acpi_scan_handler processor_container_handler = {
578 .ids = processor_container_ids,
579 .attach = acpi_processor_container_attach,
580};
581
582
583static int nr_unique_ids __initdata;
584
585
586static int nr_duplicate_ids;
587
588
589static int unique_processor_ids[] __initdata = {
590 [0 ... NR_CPUS - 1] = -1,
591};
592
593
594static int duplicate_processor_ids[] = {
595 [0 ... NR_CPUS - 1] = -1,
596};
597
598static void __init processor_validated_ids_update(int proc_id)
599{
600 int i;
601
602 if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS)
603 return;
604
605
606
607
608
609 for (i = 0; i < nr_duplicate_ids; i++) {
610 if (duplicate_processor_ids[i] == proc_id)
611 return;
612 }
613
614
615
616
617
618 for (i = 0; i < nr_unique_ids; i++) {
619 if (unique_processor_ids[i] == proc_id) {
620 duplicate_processor_ids[nr_duplicate_ids] = proc_id;
621 nr_duplicate_ids++;
622 return;
623 }
624 }
625
626
627
628
629 unique_processor_ids[nr_unique_ids] = proc_id;
630 nr_unique_ids++;
631}
632
633static acpi_status __init acpi_processor_ids_walk(acpi_handle handle,
634 u32 lvl,
635 void *context,
636 void **rv)
637{
638 acpi_status status;
639 acpi_object_type acpi_type;
640 unsigned long long uid;
641 union acpi_object object = { 0 };
642 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
643
644 status = acpi_get_type(handle, &acpi_type);
645 if (ACPI_FAILURE(status))
646 return false;
647
648 switch (acpi_type) {
649 case ACPI_TYPE_PROCESSOR:
650 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
651 if (ACPI_FAILURE(status))
652 goto err;
653 uid = object.processor.proc_id;
654 break;
655
656 case ACPI_TYPE_DEVICE:
657 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
658 if (ACPI_FAILURE(status))
659 goto err;
660 break;
661 default:
662 goto err;
663 }
664
665 processor_validated_ids_update(uid);
666 return true;
667
668err:
669 acpi_handle_info(handle, "Invalid processor object\n");
670 return false;
671
672}
673
674static void __init acpi_processor_check_duplicates(void)
675{
676
677 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
678 ACPI_UINT32_MAX,
679 acpi_processor_ids_walk,
680 NULL, NULL, NULL);
681 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk,
682 NULL, NULL);
683}
684
685bool acpi_duplicate_processor_id(int proc_id)
686{
687 int i;
688
689
690
691
692
693 for (i = 0; i < nr_duplicate_ids; i++) {
694 if (duplicate_processor_ids[i] == proc_id)
695 return true;
696 }
697 return false;
698}
699
700void __init acpi_processor_init(void)
701{
702 acpi_processor_check_duplicates();
703 acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
704 acpi_scan_add_handler(&processor_container_handler);
705}
706