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ac212b69 RW |
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 | ||
30 | ACPI_MODULE_NAME("processor"); | |
31 | ||
2e4f1db4 RW |
32 | DEFINE_PER_CPU(struct acpi_processor *, processors); |
33 | EXPORT_PER_CPU_SYMBOL(processors); | |
34 | ||
ac212b69 RW |
35 | /* -------------------------------------------------------------------------- |
36 | Errata Handling | |
37 | -------------------------------------------------------------------------- */ | |
38 | ||
39 | struct acpi_processor_errata errata __read_mostly; | |
40 | EXPORT_SYMBOL_GPL(errata); | |
41 | ||
42 | static 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; | |
1be9c3a0 | 85 | /* fall through*/ |
ac212b69 RW |
86 | |
87 | case 2: /* PIIX4E */ | |
88 | case 3: /* PIIX4M */ | |
89 | /* | |
90 | * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA | |
91 | * Livelock") from the January 2002 PIIX4 specification update. | |
92 | * Applies to all PIIX4 models. | |
93 | */ | |
94 | ||
95 | /* | |
96 | * BM-IDE | |
97 | * ------ | |
98 | * Find the PIIX4 IDE Controller and get the Bus Master IDE | |
99 | * Status register address. We'll use this later to read | |
100 | * each IDE controller's DMA status to make sure we catch all | |
101 | * DMA activity. | |
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 | * Type-F DMA | |
113 | * ---------- | |
114 | * Find the PIIX4 ISA Controller and read the Motherboard | |
115 | * DMA controller's status to see if Type-F (Fast) DMA mode | |
116 | * is enabled (bit 7) on either channel. Note that we'll | |
117 | * disable C3 support if this is enabled, as some legacy | |
118 | * devices won't operate well if fast DMA is disabled. | |
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 | ||
082e12a0 | 144 | static int acpi_processor_errata(void) |
ac212b69 RW |
145 | { |
146 | int result = 0; | |
147 | struct pci_dev *dev = NULL; | |
148 | ||
ac212b69 RW |
149 | /* |
150 | * PIIX4 | |
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 | Initialization | |
165 | -------------------------------------------------------------------------- */ | |
166 | ||
167 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
56cdc2a0 | 168 | int __weak acpi_map_cpu(acpi_handle handle, |
febf2407 | 169 | phys_cpuid_t physid, u32 acpi_id, int *pcpu) |
56cdc2a0 AC |
170 | { |
171 | return -ENODEV; | |
172 | } | |
173 | ||
174 | int __weak acpi_unmap_cpu(int cpu) | |
175 | { | |
176 | return -ENODEV; | |
177 | } | |
178 | ||
179 | int __weak arch_register_cpu(int cpu) | |
180 | { | |
181 | return -ENODEV; | |
182 | } | |
183 | ||
184 | void __weak arch_unregister_cpu(int cpu) {} | |
185 | ||
ac212b69 RW |
186 | static int acpi_processor_hotadd_init(struct acpi_processor *pr) |
187 | { | |
188 | unsigned long long sta; | |
189 | acpi_status status; | |
190 | int ret; | |
191 | ||
ddcc18f5 | 192 | if (invalid_phys_cpuid(pr->phys_id)) |
4985c32e LT |
193 | return -ENODEV; |
194 | ||
ac212b69 RW |
195 | status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta); |
196 | if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) | |
197 | return -ENODEV; | |
198 | ||
b9d10be7 TK |
199 | cpu_maps_update_begin(); |
200 | cpu_hotplug_begin(); | |
201 | ||
febf2407 | 202 | ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id); |
ac212b69 | 203 | if (ret) |
b9d10be7 | 204 | goto out; |
ac212b69 RW |
205 | |
206 | ret = arch_register_cpu(pr->id); | |
207 | if (ret) { | |
d02dc27d | 208 | acpi_unmap_cpu(pr->id); |
b9d10be7 | 209 | goto out; |
ac212b69 RW |
210 | } |
211 | ||
212 | /* | |
213 | * CPU got hot-added, but cpu_data is not initialized yet. Set a flag | |
214 | * to delay cpu_idle/throttling initialization and do it when the CPU | |
215 | * gets online for the first time. | |
216 | */ | |
217 | pr_info("CPU%d has been hot-added\n", pr->id); | |
218 | pr->flags.need_hotplug_init = 1; | |
b9d10be7 TK |
219 | |
220 | out: | |
221 | cpu_hotplug_done(); | |
222 | cpu_maps_update_done(); | |
223 | return ret; | |
ac212b69 RW |
224 | } |
225 | #else | |
226 | static inline int acpi_processor_hotadd_init(struct acpi_processor *pr) | |
227 | { | |
228 | return -ENODEV; | |
229 | } | |
230 | #endif /* CONFIG_ACPI_HOTPLUG_CPU */ | |
231 | ||
232 | static 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); | |
05eb3cd8 | 237 | int device_declaration = 0; |
ac212b69 RW |
238 | acpi_status status = AE_OK; |
239 | static int cpu0_initialized; | |
6ebb5bc9 | 240 | unsigned long long value; |
ac212b69 | 241 | |
082e12a0 | 242 | acpi_processor_errata(); |
ac212b69 RW |
243 | |
244 | /* | |
245 | * Check to see if we have bus mastering arbitration control. This | |
246 | * is required for proper C3 usage (to maintain cache coherency). | |
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 | /* Declared with "Processor" statement; match ProcessorID */ | |
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 | ||
ac212b69 RW |
266 | pr->acpi_id = object.processor.proc_id; |
267 | } else { | |
268 | /* | |
269 | * Declared with "Device" statement; match _UID. | |
270 | * Note that we don't handle string _UIDs yet. | |
271 | */ | |
ac212b69 RW |
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 | } | |
ac212b69 | 283 | |
a77d6cd9 DL |
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 | ||
8416c5bd HG |
291 | pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration, |
292 | pr->acpi_id); | |
ddcc18f5 | 293 | if (invalid_phys_cpuid(pr->phys_id)) |
af8f3f51 | 294 | acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n"); |
ac212b69 | 295 | |
05eb3cd8 | 296 | pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id); |
b50154d5 | 297 | if (!cpu0_initialized && !acpi_has_cpu_in_madt()) { |
b981513f | 298 | cpu0_initialized = 1; |
af8f3f51 HG |
299 | /* |
300 | * Handle UP system running SMP kernel, with no CPU | |
301 | * entry in MADT | |
302 | */ | |
05eb3cd8 HG |
303 | if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1)) |
304 | pr->id = 0; | |
b981513f | 305 | } |
ac212b69 RW |
306 | |
307 | /* | |
308 | * Extra Processor objects may be enumerated on MP systems with | |
309 | * less than the max # of CPUs. They should be ignored _iff | |
310 | * they are physically not present. | |
8ad893fa GZ |
311 | * |
312 | * NOTE: Even if the processor has a cpuid, it may not be present | |
313 | * because cpuid <-> apicid mapping is persistent now. | |
ac212b69 | 314 | */ |
8ad893fa | 315 | if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) { |
ac212b69 RW |
316 | int ret = acpi_processor_hotadd_init(pr); |
317 | if (ret) | |
318 | return ret; | |
319 | } | |
b981513f | 320 | |
ac212b69 RW |
321 | /* |
322 | * On some boxes several processors use the same processor bus id. | |
323 | * But they are located in different scope. For example: | |
324 | * \_SB.SCK0.CPU0 | |
325 | * \_SB.SCK1.CPU0 | |
326 | * Rename the processor device bus id. And the new bus id will be | |
327 | * generated as the following format: | |
328 | * CPU+CPU ID. | |
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; | |
ac212b69 RW |
345 | } |
346 | ||
347 | /* | |
348 | * If ACPI describes a slot number for this CPU, we can use it to | |
349 | * ensure we get the right value in the "physical id" field | |
350 | * of /proc/cpuinfo | |
351 | */ | |
6ebb5bc9 | 352 | status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value); |
ac212b69 | 353 | if (ACPI_SUCCESS(status)) |
6ebb5bc9 | 354 | arch_fix_phys_package_id(pr->id, value); |
ac212b69 RW |
355 | |
356 | return 0; | |
357 | } | |
358 | ||
359 | /* | |
360 | * Do not put anything in here which needs the core to be online. | |
361 | * For example MSR access or setting up things which check for cpuinfo_x86 | |
362 | * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc. | |
363 | * Such things have to be put in and set up by the processor driver's .probe(). | |
364 | */ | |
365 | static DEFINE_PER_CPU(void *, processor_device_array); | |
366 | ||
fe7bf106 | 367 | static int acpi_processor_add(struct acpi_device *device, |
ac212b69 RW |
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) /* Processor is not physically present or unavailable */ | |
390 | return 0; | |
391 | ||
ac212b69 RW |
392 | BUG_ON(pr->id >= nr_cpu_ids); |
393 | ||
394 | /* | |
395 | * Buggy BIOS check. | |
396 | * ACPI id of processors can be reported wrongly by the BIOS. | |
397 | * Don't trust it blindly | |
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 | /* Give up, but do not abort the namespace scan. */ | |
405 | goto err; | |
406 | } | |
407 | /* | |
408 | * processor_device_array is not cleared on errors to allow buggy BIOS | |
409 | * checks. | |
410 | */ | |
411 | per_cpu(processor_device_array, pr->id) = device; | |
2e4f1db4 | 412 | per_cpu(processors, pr->id) = pr; |
ac212b69 RW |
413 | |
414 | dev = get_cpu_device(pr->id); | |
173a5a4c HG |
415 | if (!dev) { |
416 | result = -ENODEV; | |
417 | goto err; | |
418 | } | |
419 | ||
24dee1fc | 420 | result = acpi_bind_one(dev, device); |
ac212b69 RW |
421 | if (result) |
422 | goto err; | |
423 | ||
424 | pr->dev = dev; | |
ac212b69 RW |
425 | |
426 | /* Trigger the processor driver's .probe() if present. */ | |
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; | |
2e4f1db4 | 436 | per_cpu(processors, pr->id) = NULL; |
ac212b69 RW |
437 | err_free_pr: |
438 | kfree(pr); | |
439 | return result; | |
440 | } | |
441 | ||
442 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
443 | /* -------------------------------------------------------------------------- | |
444 | Removal | |
445 | -------------------------------------------------------------------------- */ | |
446 | ||
447 | static 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 | * The only reason why we ever get here is CPU hot-removal. The CPU is | |
460 | * already offline and the ACPI device removal locking prevents it from | |
461 | * being put back online at this point. | |
462 | * | |
463 | * Unbind the driver from the processor device and detach it from the | |
464 | * ACPI companion object. | |
465 | */ | |
466 | device_release_driver(pr->dev); | |
467 | acpi_unbind_one(pr->dev); | |
468 | ||
469 | /* Clean up. */ | |
470 | per_cpu(processor_device_array, pr->id) = NULL; | |
2e4f1db4 | 471 | per_cpu(processors, pr->id) = NULL; |
ac212b69 | 472 | |
b9d10be7 TK |
473 | cpu_maps_update_begin(); |
474 | cpu_hotplug_begin(); | |
475 | ||
ac212b69 | 476 | /* Remove the CPU. */ |
ac212b69 | 477 | arch_unregister_cpu(pr->id); |
d02dc27d | 478 | acpi_unmap_cpu(pr->id); |
b9d10be7 TK |
479 | |
480 | cpu_hotplug_done(); | |
481 | cpu_maps_update_done(); | |
ac212b69 | 482 | |
1e385f6f YI |
483 | try_offline_node(cpu_to_node(pr->id)); |
484 | ||
ac212b69 RW |
485 | out: |
486 | free_cpumask_var(pr->throttling.shared_cpu_map); | |
487 | kfree(pr); | |
488 | } | |
489 | #endif /* CONFIG_ACPI_HOTPLUG_CPU */ | |
490 | ||
a2121167 SP |
491 | #ifdef CONFIG_X86 |
492 | static bool acpi_hwp_native_thermal_lvt_set; | |
493 | static 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; /* set bit 12 */ | |
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 | ||
529 | void __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 | ||
ac212b69 RW |
543 | /* |
544 | * The following ACPI IDs are known to be suitable for representing as | |
545 | * processor devices. | |
546 | */ | |
547 | static const struct acpi_device_id processor_device_ids[] = { | |
548 | ||
549 | { ACPI_PROCESSOR_OBJECT_HID, }, | |
550 | { ACPI_PROCESSOR_DEVICE_HID, }, | |
551 | ||
552 | { } | |
553 | }; | |
554 | ||
8ce344c6 | 555 | static struct acpi_scan_handler processor_handler = { |
ac212b69 RW |
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 | ||
db62fda3 SH |
566 | static int acpi_processor_container_attach(struct acpi_device *dev, |
567 | const struct acpi_device_id *id) | |
568 | { | |
569 | return 1; | |
570 | } | |
571 | ||
572 | static const struct acpi_device_id processor_container_ids[] = { | |
573 | { ACPI_PROCESSOR_CONTAINER_HID, }, | |
574 | { } | |
575 | }; | |
576 | ||
577 | static struct acpi_scan_handler processor_container_handler = { | |
578 | .ids = processor_container_ids, | |
579 | .attach = acpi_processor_container_attach, | |
580 | }; | |
581 | ||
8e089eaa DL |
582 | /* The number of the unique processor IDs */ |
583 | static int nr_unique_ids __initdata; | |
584 | ||
585 | /* The number of the duplicate processor IDs */ | |
a77d6cd9 | 586 | static int nr_duplicate_ids; |
8e089eaa DL |
587 | |
588 | /* Used to store the unique processor IDs */ | |
589 | static int unique_processor_ids[] __initdata = { | |
590 | [0 ... NR_CPUS - 1] = -1, | |
591 | }; | |
592 | ||
593 | /* Used to store the duplicate processor IDs */ | |
a77d6cd9 | 594 | static int duplicate_processor_ids[] = { |
8e089eaa DL |
595 | [0 ... NR_CPUS - 1] = -1, |
596 | }; | |
597 | ||
598 | static 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 | * Firstly, compare the proc_id with duplicate IDs, if the proc_id is | |
607 | * already in the IDs, do nothing. | |
608 | */ | |
609 | for (i = 0; i < nr_duplicate_ids; i++) { | |
610 | if (duplicate_processor_ids[i] == proc_id) | |
611 | return; | |
612 | } | |
613 | ||
614 | /* | |
615 | * Secondly, compare the proc_id with unique IDs, if the proc_id is in | |
616 | * the IDs, put it in the duplicate IDs. | |
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 | * Lastly, the proc_id is a unique ID, put it in the unique IDs. | |
628 | */ | |
629 | unique_processor_ids[nr_unique_ids] = proc_id; | |
630 | nr_unique_ids++; | |
631 | } | |
632 | ||
633 | static acpi_status __init acpi_processor_ids_walk(acpi_handle handle, | |
634 | u32 lvl, | |
635 | void *context, | |
636 | void **rv) | |
637 | { | |
638 | acpi_status status; | |
8c8cb30f DL |
639 | acpi_object_type acpi_type; |
640 | unsigned long long uid; | |
8e089eaa DL |
641 | union acpi_object object = { 0 }; |
642 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
643 | ||
8c8cb30f | 644 | status = acpi_get_type(handle, &acpi_type); |
8e089eaa | 645 | if (ACPI_FAILURE(status)) |
8c8cb30f DL |
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 | ||
668 | err: | |
669 | acpi_handle_info(handle, "Invalid processor object\n"); | |
670 | return false; | |
8e089eaa | 671 | |
8e089eaa DL |
672 | } |
673 | ||
0ed780e3 | 674 | static void __init acpi_processor_check_duplicates(void) |
8e089eaa | 675 | { |
8c8cb30f | 676 | /* check the correctness for all processors in ACPI namespace */ |
8e089eaa DL |
677 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, |
678 | ACPI_UINT32_MAX, | |
679 | acpi_processor_ids_walk, | |
680 | NULL, NULL, NULL); | |
8c8cb30f DL |
681 | acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk, |
682 | NULL, NULL); | |
8e089eaa DL |
683 | } |
684 | ||
a77d6cd9 | 685 | bool acpi_duplicate_processor_id(int proc_id) |
fd74da21 DL |
686 | { |
687 | int i; | |
688 | ||
689 | /* | |
690 | * compare the proc_id with duplicate IDs, if the proc_id is already | |
691 | * in the duplicate IDs, return true, otherwise, return false. | |
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 | ||
ac212b69 RW |
700 | void __init acpi_processor_init(void) |
701 | { | |
8e089eaa | 702 | acpi_processor_check_duplicates(); |
ac212b69 | 703 | acpi_scan_add_handler_with_hotplug(&processor_handler, "processor"); |
db62fda3 | 704 | acpi_scan_add_handler(&processor_container_handler); |
ac212b69 | 705 | } |