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1/*
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
32DEFINE_PER_CPU(struct acpi_processor *, processors);
33EXPORT_PER_CPU_SYMBOL(processors);
34
35/* --------------------------------------------------------------------------
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
143static int acpi_processor_errata(void)
144{
145 int result = 0;
146 struct pci_dev *dev = NULL;
147
148 /*
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
167int __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
185int __weak acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
186{
187 return -ENODEV;
188}
189
190static int acpi_processor_hotadd_init(struct acpi_processor *pr)
191{
192 unsigned long long sta;
193 acpi_status status;
194 int ret;
195
196 if (invalid_phys_cpuid(pr->phys_id))
197 return -ENODEV;
198
199 status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
200 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
201 return -ENODEV;
202
203 cpu_maps_update_begin();
204 cpu_hotplug_begin();
205
206 ret = acpi_map_cpu(pr->handle, pr->phys_id, &pr->id);
207 if (ret)
208 goto out;
209
210 ret = arch_register_cpu(pr->id);
211 if (ret) {
212 acpi_unmap_cpu(pr->id);
213 goto out;
214 }
215
216 /*
217 * CPU got hot-added, but cpu_data is not initialized yet. Set a flag
218 * to delay cpu_idle/throttling initialization and do it when the CPU
219 * gets online for the first time.
220 */
221 pr_info("CPU%d has been hot-added\n", pr->id);
222 pr->flags.need_hotplug_init = 1;
223
224out:
225 cpu_hotplug_done();
226 cpu_maps_update_done();
227 return ret;
228}
229#else
230static inline int acpi_processor_hotadd_init(struct acpi_processor *pr)
231{
232 return -ENODEV;
233}
234#endif /* CONFIG_ACPI_HOTPLUG_CPU */
235
236static int acpi_processor_get_info(struct acpi_device *device)
237{
238 union acpi_object object = { 0 };
239 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
240 struct acpi_processor *pr = acpi_driver_data(device);
241 int device_declaration = 0;
242 acpi_status status = AE_OK;
243 static int cpu0_initialized;
244 unsigned long long value;
245
246 acpi_processor_errata();
247
248 /*
249 * Check to see if we have bus mastering arbitration control. This
250 * is required for proper C3 usage (to maintain cache coherency).
251 */
252 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
253 pr->flags.bm_control = 1;
254 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
255 "Bus mastering arbitration control present\n"));
256 } else
257 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
258 "No bus mastering arbitration control\n"));
259
260 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
261 /* Declared with "Processor" statement; match ProcessorID */
262 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
263 if (ACPI_FAILURE(status)) {
264 dev_err(&device->dev,
265 "Failed to evaluate processor object (0x%x)\n",
266 status);
267 return -ENODEV;
268 }
269
270 pr->acpi_id = object.processor.proc_id;
271 } else {
272 /*
273 * Declared with "Device" statement; match _UID.
274 * Note that we don't handle string _UIDs yet.
275 */
276 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
277 NULL, &value);
278 if (ACPI_FAILURE(status)) {
279 dev_err(&device->dev,
280 "Failed to evaluate processor _UID (0x%x)\n",
281 status);
282 return -ENODEV;
283 }
284 device_declaration = 1;
285 pr->acpi_id = value;
286 }
287
288 pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,
289 pr->acpi_id);
290 if (invalid_phys_cpuid(pr->phys_id))
291 acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n");
292
293 pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id);
294 if (!cpu0_initialized && !acpi_has_cpu_in_madt()) {
295 cpu0_initialized = 1;
296 /*
297 * Handle UP system running SMP kernel, with no CPU
298 * entry in MADT
299 */
300 if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1))
301 pr->id = 0;
302 }
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.
308 *
309 * NOTE: Even if the processor has a cpuid, it may not be present
310 * because cpuid <-> apicid mapping is persistent now.
311 */
312 if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) {
313 int ret = acpi_processor_hotadd_init(pr);
314 if (ret)
315 return ret;
316 }
317
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;
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 */
349 status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value);
350 if (ACPI_SUCCESS(status))
351 arch_fix_phys_package_id(pr->id, value);
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
364static int acpi_processor_add(struct acpi_device *device,
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
389#ifdef CONFIG_SMP
390 if (pr->id >= setup_max_cpus && pr->id != 0)
391 return 0;
392#endif
393
394 BUG_ON(pr->id >= nr_cpu_ids);
395
396 /*
397 * Buggy BIOS check.
398 * ACPI id of processors can be reported wrongly by the BIOS.
399 * Don't trust it blindly
400 */
401 if (per_cpu(processor_device_array, pr->id) != NULL &&
402 per_cpu(processor_device_array, pr->id) != device) {
403 dev_warn(&device->dev,
404 "BIOS reported wrong ACPI id %d for the processor\n",
405 pr->id);
406 /* Give up, but do not abort the namespace scan. */
407 goto err;
408 }
409 /*
410 * processor_device_array is not cleared on errors to allow buggy BIOS
411 * checks.
412 */
413 per_cpu(processor_device_array, pr->id) = device;
414 per_cpu(processors, pr->id) = pr;
415
416 dev = get_cpu_device(pr->id);
417 if (!dev) {
418 result = -ENODEV;
419 goto err;
420 }
421
422 result = acpi_bind_one(dev, device);
423 if (result)
424 goto err;
425
426 pr->dev = dev;
427
428 /* Trigger the processor driver's .probe() if present. */
429 if (device_attach(dev) >= 0)
430 return 1;
431
432 dev_err(dev, "Processor driver could not be attached\n");
433 acpi_unbind_one(dev);
434
435 err:
436 free_cpumask_var(pr->throttling.shared_cpu_map);
437 device->driver_data = NULL;
438 per_cpu(processors, pr->id) = NULL;
439 err_free_pr:
440 kfree(pr);
441 return result;
442}
443
444#ifdef CONFIG_ACPI_HOTPLUG_CPU
445/* --------------------------------------------------------------------------
446 Removal
447 -------------------------------------------------------------------------- */
448
449static void acpi_processor_remove(struct acpi_device *device)
450{
451 struct acpi_processor *pr;
452
453 if (!device || !acpi_driver_data(device))
454 return;
455
456 pr = acpi_driver_data(device);
457 if (pr->id >= nr_cpu_ids)
458 goto out;
459
460 /*
461 * The only reason why we ever get here is CPU hot-removal. The CPU is
462 * already offline and the ACPI device removal locking prevents it from
463 * being put back online at this point.
464 *
465 * Unbind the driver from the processor device and detach it from the
466 * ACPI companion object.
467 */
468 device_release_driver(pr->dev);
469 acpi_unbind_one(pr->dev);
470
471 /* Clean up. */
472 per_cpu(processor_device_array, pr->id) = NULL;
473 per_cpu(processors, pr->id) = NULL;
474
475 cpu_maps_update_begin();
476 cpu_hotplug_begin();
477
478 /* Remove the CPU. */
479 arch_unregister_cpu(pr->id);
480 acpi_unmap_cpu(pr->id);
481
482 cpu_hotplug_done();
483 cpu_maps_update_done();
484
485 try_offline_node(cpu_to_node(pr->id));
486
487 out:
488 free_cpumask_var(pr->throttling.shared_cpu_map);
489 kfree(pr);
490}
491#endif /* CONFIG_ACPI_HOTPLUG_CPU */
492
493#ifdef CONFIG_X86
494static bool acpi_hwp_native_thermal_lvt_set;
495static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
496 u32 lvl,
497 void *context,
498 void **rv)
499{
500 u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953";
501 u32 capbuf[2];
502 struct acpi_osc_context osc_context = {
503 .uuid_str = sb_uuid_str,
504 .rev = 1,
505 .cap.length = 8,
506 .cap.pointer = capbuf,
507 };
508
509 if (acpi_hwp_native_thermal_lvt_set)
510 return AE_CTRL_TERMINATE;
511
512 capbuf[0] = 0x0000;
513 capbuf[1] = 0x1000; /* set bit 12 */
514
515 if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) {
516 if (osc_context.ret.pointer && osc_context.ret.length > 1) {
517 u32 *capbuf_ret = osc_context.ret.pointer;
518
519 if (capbuf_ret[1] & 0x1000) {
520 acpi_handle_info(handle,
521 "_OSC native thermal LVT Acked\n");
522 acpi_hwp_native_thermal_lvt_set = true;
523 }
524 }
525 kfree(osc_context.ret.pointer);
526 }
527
528 return AE_OK;
529}
530
531void __init acpi_early_processor_osc(void)
532{
533 if (boot_cpu_has(X86_FEATURE_HWP)) {
534 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
535 ACPI_UINT32_MAX,
536 acpi_hwp_native_thermal_lvt_osc,
537 NULL, NULL, NULL);
538 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID,
539 acpi_hwp_native_thermal_lvt_osc,
540 NULL, NULL);
541 }
542}
543#endif
544
545/*
546 * The following ACPI IDs are known to be suitable for representing as
547 * processor devices.
548 */
549static const struct acpi_device_id processor_device_ids[] = {
550
551 { ACPI_PROCESSOR_OBJECT_HID, },
552 { ACPI_PROCESSOR_DEVICE_HID, },
553
554 { }
555};
556
557static struct acpi_scan_handler processor_handler = {
558 .ids = processor_device_ids,
559 .attach = acpi_processor_add,
560#ifdef CONFIG_ACPI_HOTPLUG_CPU
561 .detach = acpi_processor_remove,
562#endif
563 .hotplug = {
564 .enabled = true,
565 },
566};
567
568static int acpi_processor_container_attach(struct acpi_device *dev,
569 const struct acpi_device_id *id)
570{
571 return 1;
572}
573
574static const struct acpi_device_id processor_container_ids[] = {
575 { ACPI_PROCESSOR_CONTAINER_HID, },
576 { }
577};
578
579static struct acpi_scan_handler processor_container_handler = {
580 .ids = processor_container_ids,
581 .attach = acpi_processor_container_attach,
582};
583
584/* The number of the unique processor IDs */
585static int nr_unique_ids __initdata;
586
587/* The number of the duplicate processor IDs */
588static int nr_duplicate_ids __initdata;
589
590/* Used to store the unique processor IDs */
591static int unique_processor_ids[] __initdata = {
592 [0 ... NR_CPUS - 1] = -1,
593};
594
595/* Used to store the duplicate processor IDs */
596static int duplicate_processor_ids[] __initdata = {
597 [0 ... NR_CPUS - 1] = -1,
598};
599
600static void __init processor_validated_ids_update(int proc_id)
601{
602 int i;
603
604 if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS)
605 return;
606
607 /*
608 * Firstly, compare the proc_id with duplicate IDs, if the proc_id is
609 * already in the IDs, do nothing.
610 */
611 for (i = 0; i < nr_duplicate_ids; i++) {
612 if (duplicate_processor_ids[i] == proc_id)
613 return;
614 }
615
616 /*
617 * Secondly, compare the proc_id with unique IDs, if the proc_id is in
618 * the IDs, put it in the duplicate IDs.
619 */
620 for (i = 0; i < nr_unique_ids; i++) {
621 if (unique_processor_ids[i] == proc_id) {
622 duplicate_processor_ids[nr_duplicate_ids] = proc_id;
623 nr_duplicate_ids++;
624 return;
625 }
626 }
627
628 /*
629 * Lastly, the proc_id is a unique ID, put it in the unique IDs.
630 */
631 unique_processor_ids[nr_unique_ids] = proc_id;
632 nr_unique_ids++;
633}
634
635static acpi_status __init acpi_processor_ids_walk(acpi_handle handle,
636 u32 lvl,
637 void *context,
638 void **rv)
639{
640 acpi_status status;
641 union acpi_object object = { 0 };
642 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
643
644 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
645 if (ACPI_FAILURE(status))
646 acpi_handle_info(handle, "Not get the processor object\n");
647 else
648 processor_validated_ids_update(object.processor.proc_id);
649
650 return AE_OK;
651}
652
653static void __init acpi_processor_check_duplicates(void)
654{
655 /* Search all processor nodes in ACPI namespace */
656 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
657 ACPI_UINT32_MAX,
658 acpi_processor_ids_walk,
659 NULL, NULL, NULL);
660}
661
662bool __init acpi_processor_validate_proc_id(int proc_id)
663{
664 int i;
665
666 /*
667 * compare the proc_id with duplicate IDs, if the proc_id is already
668 * in the duplicate IDs, return true, otherwise, return false.
669 */
670 for (i = 0; i < nr_duplicate_ids; i++) {
671 if (duplicate_processor_ids[i] == proc_id)
672 return true;
673 }
674 return false;
675}
676
677void __init acpi_processor_init(void)
678{
679 acpi_processor_check_duplicates();
680 acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
681 acpi_scan_add_handler(&processor_container_handler);
682}