Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ac212b69 RW |
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 RW |
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 | ||
27 | ACPI_MODULE_NAME("processor"); | |
28 | ||
2e4f1db4 RW |
29 | DEFINE_PER_CPU(struct acpi_processor *, processors); |
30 | EXPORT_PER_CPU_SYMBOL(processors); | |
31 | ||
ac212b69 RW |
32 | /* -------------------------------------------------------------------------- |
33 | Errata Handling | |
34 | -------------------------------------------------------------------------- */ | |
35 | ||
36 | struct acpi_processor_errata errata __read_mostly; | |
37 | EXPORT_SYMBOL_GPL(errata); | |
38 | ||
39 | static 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*/ |
ac212b69 RW |
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 | 141 | static int acpi_processor_errata(void) |
ac212b69 RW |
142 | { |
143 | int result = 0; | |
144 | struct pci_dev *dev = NULL; | |
145 | ||
ac212b69 RW |
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 | 165 | int __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 | ||
171 | int __weak acpi_unmap_cpu(int cpu) | |
172 | { | |
173 | return -ENODEV; | |
174 | } | |
175 | ||
176 | int __weak arch_register_cpu(int cpu) | |
177 | { | |
178 | return -ENODEV; | |
179 | } | |
180 | ||
181 | void __weak arch_unregister_cpu(int cpu) {} | |
182 | ||
ac212b69 RW |
183 | static 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 RW |
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; |
ac212b69 RW |
202 | |
203 | ret = arch_register_cpu(pr->id); | |
204 | if (ret) { | |
d02dc27d | 205 | acpi_unmap_cpu(pr->id); |
b9d10be7 | 206 | goto out; |
ac212b69 RW |
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 | |
217 | out: | |
218 | cpu_hotplug_done(); | |
219 | cpu_maps_update_done(); | |
220 | return ret; | |
ac212b69 RW |
221 | } |
222 | #else | |
223 | static inline int acpi_processor_hotadd_init(struct acpi_processor *pr) | |
224 | { | |
225 | return -ENODEV; | |
226 | } | |
227 | #endif /* CONFIG_ACPI_HOTPLUG_CPU */ | |
228 | ||
229 | static 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; |
ac212b69 RW |
235 | acpi_status status = AE_OK; |
236 | static int cpu0_initialized; | |
6ebb5bc9 | 237 | unsigned long long value; |
ac212b69 | 238 | |
082e12a0 | 239 | acpi_processor_errata(); |
ac212b69 RW |
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 | ||
ac212b69 RW |
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 | */ | |
ac212b69 RW |
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 | } |
ac212b69 RW |
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)) { |
ac212b69 RW |
313 | int ret = acpi_processor_hotadd_init(pr); |
314 | if (ret) | |
315 | return ret; | |
316 | } | |
b981513f | 317 | |
ac212b69 RW |
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; | |
ac212b69 RW |
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); |
ac212b69 RW |
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 | */ | |
362 | static DEFINE_PER_CPU(void *, processor_device_array); | |
363 | ||
fe7bf106 | 364 | static int acpi_processor_add(struct acpi_device *device, |
ac212b69 RW |
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 | ||
ac212b69 RW |
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 RW |
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 RW |
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 RW |
434 | err_free_pr: |
435 | kfree(pr); | |
436 | return result; | |
437 | } | |
438 | ||
439 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
440 | /* -------------------------------------------------------------------------- | |
441 | Removal | |
442 | -------------------------------------------------------------------------- */ | |
443 | ||
444 | static 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 |
489 | static bool acpi_hwp_native_thermal_lvt_set; | |
490 | static 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 | ||
526 | void __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 | ||
ac212b69 RW |
540 | /* |
541 | * The following ACPI IDs are known to be suitable for representing as | |
542 | * processor devices. | |
543 | */ | |
544 | static const struct acpi_device_id processor_device_ids[] = { | |
545 | ||
546 | { ACPI_PROCESSOR_OBJECT_HID, }, | |
547 | { ACPI_PROCESSOR_DEVICE_HID, }, | |
548 | ||
549 | { } | |
550 | }; | |
551 | ||
8ce344c6 | 552 | static struct acpi_scan_handler processor_handler = { |
ac212b69 RW |
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 |
563 | static int acpi_processor_container_attach(struct acpi_device *dev, |
564 | const struct acpi_device_id *id) | |
565 | { | |
566 | return 1; | |
567 | } | |
568 | ||
569 | static const struct acpi_device_id processor_container_ids[] = { | |
570 | { ACPI_PROCESSOR_CONTAINER_HID, }, | |
571 | { } | |
572 | }; | |
573 | ||
574 | static 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 */ |
580 | static int nr_unique_ids __initdata; | |
581 | ||
582 | /* The number of the duplicate processor IDs */ | |
a77d6cd9 | 583 | static int nr_duplicate_ids; |
8e089eaa DL |
584 | |
585 | /* Used to store the unique processor IDs */ | |
586 | static int unique_processor_ids[] __initdata = { | |
587 | [0 ... NR_CPUS - 1] = -1, | |
588 | }; | |
589 | ||
590 | /* Used to store the duplicate processor IDs */ | |
a77d6cd9 | 591 | static int duplicate_processor_ids[] = { |
8e089eaa DL |
592 | [0 ... NR_CPUS - 1] = -1, |
593 | }; | |
594 | ||
595 | static 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 | ||
630 | static 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 | |
665 | err: | |
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 | 672 | static 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 | 683 | bool 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 |
698 | void __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 | } |