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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; | |
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 | ||
082e12a0 | 143 | static int acpi_processor_errata(void) |
ac212b69 RW |
144 | { |
145 | int result = 0; | |
146 | struct pci_dev *dev = NULL; | |
147 | ||
ac212b69 RW |
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 | |
56cdc2a0 | 167 | int __weak acpi_map_cpu(acpi_handle handle, |
febf2407 | 168 | phys_cpuid_t physid, u32 acpi_id, int *pcpu) |
56cdc2a0 AC |
169 | { |
170 | return -ENODEV; | |
171 | } | |
172 | ||
173 | int __weak acpi_unmap_cpu(int cpu) | |
174 | { | |
175 | return -ENODEV; | |
176 | } | |
177 | ||
178 | int __weak arch_register_cpu(int cpu) | |
179 | { | |
180 | return -ENODEV; | |
181 | } | |
182 | ||
183 | void __weak arch_unregister_cpu(int cpu) {} | |
184 | ||
ac212b69 RW |
185 | static int acpi_processor_hotadd_init(struct acpi_processor *pr) |
186 | { | |
187 | unsigned long long sta; | |
188 | acpi_status status; | |
189 | int ret; | |
190 | ||
ddcc18f5 | 191 | if (invalid_phys_cpuid(pr->phys_id)) |
4985c32e LT |
192 | return -ENODEV; |
193 | ||
ac212b69 RW |
194 | status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta); |
195 | if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) | |
196 | return -ENODEV; | |
197 | ||
b9d10be7 TK |
198 | cpu_maps_update_begin(); |
199 | cpu_hotplug_begin(); | |
200 | ||
febf2407 | 201 | ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id); |
ac212b69 | 202 | if (ret) |
b9d10be7 | 203 | goto out; |
ac212b69 RW |
204 | |
205 | ret = arch_register_cpu(pr->id); | |
206 | if (ret) { | |
d02dc27d | 207 | acpi_unmap_cpu(pr->id); |
b9d10be7 | 208 | goto out; |
ac212b69 RW |
209 | } |
210 | ||
211 | /* | |
212 | * CPU got hot-added, but cpu_data is not initialized yet. Set a flag | |
213 | * to delay cpu_idle/throttling initialization and do it when the CPU | |
214 | * gets online for the first time. | |
215 | */ | |
216 | pr_info("CPU%d has been hot-added\n", pr->id); | |
217 | pr->flags.need_hotplug_init = 1; | |
b9d10be7 TK |
218 | |
219 | out: | |
220 | cpu_hotplug_done(); | |
221 | cpu_maps_update_done(); | |
222 | return ret; | |
ac212b69 RW |
223 | } |
224 | #else | |
225 | static inline int acpi_processor_hotadd_init(struct acpi_processor *pr) | |
226 | { | |
227 | return -ENODEV; | |
228 | } | |
229 | #endif /* CONFIG_ACPI_HOTPLUG_CPU */ | |
230 | ||
231 | static int acpi_processor_get_info(struct acpi_device *device) | |
232 | { | |
233 | union acpi_object object = { 0 }; | |
234 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
235 | struct acpi_processor *pr = acpi_driver_data(device); | |
05eb3cd8 | 236 | int device_declaration = 0; |
ac212b69 RW |
237 | acpi_status status = AE_OK; |
238 | static int cpu0_initialized; | |
6ebb5bc9 | 239 | unsigned long long value; |
ac212b69 | 240 | |
082e12a0 | 241 | acpi_processor_errata(); |
ac212b69 RW |
242 | |
243 | /* | |
244 | * Check to see if we have bus mastering arbitration control. This | |
245 | * is required for proper C3 usage (to maintain cache coherency). | |
246 | */ | |
247 | if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { | |
248 | pr->flags.bm_control = 1; | |
249 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
250 | "Bus mastering arbitration control present\n")); | |
251 | } else | |
252 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
253 | "No bus mastering arbitration control\n")); | |
254 | ||
255 | if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) { | |
256 | /* Declared with "Processor" statement; match ProcessorID */ | |
257 | status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); | |
258 | if (ACPI_FAILURE(status)) { | |
259 | dev_err(&device->dev, | |
260 | "Failed to evaluate processor object (0x%x)\n", | |
261 | status); | |
262 | return -ENODEV; | |
263 | } | |
264 | ||
ac212b69 RW |
265 | pr->acpi_id = object.processor.proc_id; |
266 | } else { | |
267 | /* | |
268 | * Declared with "Device" statement; match _UID. | |
269 | * Note that we don't handle string _UIDs yet. | |
270 | */ | |
ac212b69 RW |
271 | status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, |
272 | NULL, &value); | |
273 | if (ACPI_FAILURE(status)) { | |
274 | dev_err(&device->dev, | |
275 | "Failed to evaluate processor _UID (0x%x)\n", | |
276 | status); | |
277 | return -ENODEV; | |
278 | } | |
279 | device_declaration = 1; | |
280 | pr->acpi_id = value; | |
281 | } | |
ac212b69 | 282 | |
a77d6cd9 DL |
283 | if (acpi_duplicate_processor_id(pr->acpi_id)) { |
284 | dev_err(&device->dev, | |
285 | "Failed to get unique processor _UID (0x%x)\n", | |
286 | pr->acpi_id); | |
287 | return -ENODEV; | |
288 | } | |
289 | ||
8416c5bd HG |
290 | pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration, |
291 | pr->acpi_id); | |
ddcc18f5 | 292 | if (invalid_phys_cpuid(pr->phys_id)) |
af8f3f51 | 293 | acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n"); |
ac212b69 | 294 | |
05eb3cd8 | 295 | pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id); |
b50154d5 | 296 | if (!cpu0_initialized && !acpi_has_cpu_in_madt()) { |
b981513f | 297 | cpu0_initialized = 1; |
af8f3f51 HG |
298 | /* |
299 | * Handle UP system running SMP kernel, with no CPU | |
300 | * entry in MADT | |
301 | */ | |
05eb3cd8 HG |
302 | if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1)) |
303 | pr->id = 0; | |
b981513f | 304 | } |
ac212b69 RW |
305 | |
306 | /* | |
307 | * Extra Processor objects may be enumerated on MP systems with | |
308 | * less than the max # of CPUs. They should be ignored _iff | |
309 | * they are physically not present. | |
8ad893fa GZ |
310 | * |
311 | * NOTE: Even if the processor has a cpuid, it may not be present | |
312 | * because cpuid <-> apicid mapping is persistent now. | |
ac212b69 | 313 | */ |
8ad893fa | 314 | if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) { |
ac212b69 RW |
315 | int ret = acpi_processor_hotadd_init(pr); |
316 | if (ret) | |
317 | return ret; | |
318 | } | |
b981513f | 319 | |
ac212b69 RW |
320 | /* |
321 | * On some boxes several processors use the same processor bus id. | |
322 | * But they are located in different scope. For example: | |
323 | * \_SB.SCK0.CPU0 | |
324 | * \_SB.SCK1.CPU0 | |
325 | * Rename the processor device bus id. And the new bus id will be | |
326 | * generated as the following format: | |
327 | * CPU+CPU ID. | |
328 | */ | |
329 | sprintf(acpi_device_bid(device), "CPU%X", pr->id); | |
330 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, | |
331 | pr->acpi_id)); | |
332 | ||
333 | if (!object.processor.pblk_address) | |
334 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); | |
335 | else if (object.processor.pblk_length != 6) | |
336 | dev_err(&device->dev, "Invalid PBLK length [%d]\n", | |
337 | object.processor.pblk_length); | |
338 | else { | |
339 | pr->throttling.address = object.processor.pblk_address; | |
340 | pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; | |
341 | pr->throttling.duty_width = acpi_gbl_FADT.duty_width; | |
342 | ||
343 | pr->pblk = object.processor.pblk_address; | |
ac212b69 RW |
344 | } |
345 | ||
346 | /* | |
347 | * If ACPI describes a slot number for this CPU, we can use it to | |
348 | * ensure we get the right value in the "physical id" field | |
349 | * of /proc/cpuinfo | |
350 | */ | |
6ebb5bc9 | 351 | status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value); |
ac212b69 | 352 | if (ACPI_SUCCESS(status)) |
6ebb5bc9 | 353 | arch_fix_phys_package_id(pr->id, value); |
ac212b69 RW |
354 | |
355 | return 0; | |
356 | } | |
357 | ||
358 | /* | |
359 | * Do not put anything in here which needs the core to be online. | |
360 | * For example MSR access or setting up things which check for cpuinfo_x86 | |
361 | * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc. | |
362 | * Such things have to be put in and set up by the processor driver's .probe(). | |
363 | */ | |
364 | static DEFINE_PER_CPU(void *, processor_device_array); | |
365 | ||
fe7bf106 | 366 | static int acpi_processor_add(struct acpi_device *device, |
ac212b69 RW |
367 | const struct acpi_device_id *id) |
368 | { | |
369 | struct acpi_processor *pr; | |
370 | struct device *dev; | |
371 | int result = 0; | |
372 | ||
373 | pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); | |
374 | if (!pr) | |
375 | return -ENOMEM; | |
376 | ||
377 | if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { | |
378 | result = -ENOMEM; | |
379 | goto err_free_pr; | |
380 | } | |
381 | ||
382 | pr->handle = device->handle; | |
383 | strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); | |
384 | strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); | |
385 | device->driver_data = pr; | |
386 | ||
387 | result = acpi_processor_get_info(device); | |
388 | if (result) /* Processor is not physically present or unavailable */ | |
389 | return 0; | |
390 | ||
ac212b69 RW |
391 | BUG_ON(pr->id >= nr_cpu_ids); |
392 | ||
393 | /* | |
394 | * Buggy BIOS check. | |
395 | * ACPI id of processors can be reported wrongly by the BIOS. | |
396 | * Don't trust it blindly | |
397 | */ | |
398 | if (per_cpu(processor_device_array, pr->id) != NULL && | |
399 | per_cpu(processor_device_array, pr->id) != device) { | |
400 | dev_warn(&device->dev, | |
401 | "BIOS reported wrong ACPI id %d for the processor\n", | |
402 | pr->id); | |
403 | /* Give up, but do not abort the namespace scan. */ | |
404 | goto err; | |
405 | } | |
406 | /* | |
407 | * processor_device_array is not cleared on errors to allow buggy BIOS | |
408 | * checks. | |
409 | */ | |
410 | per_cpu(processor_device_array, pr->id) = device; | |
2e4f1db4 | 411 | per_cpu(processors, pr->id) = pr; |
ac212b69 RW |
412 | |
413 | dev = get_cpu_device(pr->id); | |
173a5a4c HG |
414 | if (!dev) { |
415 | result = -ENODEV; | |
416 | goto err; | |
417 | } | |
418 | ||
24dee1fc | 419 | result = acpi_bind_one(dev, device); |
ac212b69 RW |
420 | if (result) |
421 | goto err; | |
422 | ||
423 | pr->dev = dev; | |
ac212b69 RW |
424 | |
425 | /* Trigger the processor driver's .probe() if present. */ | |
426 | if (device_attach(dev) >= 0) | |
427 | return 1; | |
428 | ||
429 | dev_err(dev, "Processor driver could not be attached\n"); | |
430 | acpi_unbind_one(dev); | |
431 | ||
432 | err: | |
433 | free_cpumask_var(pr->throttling.shared_cpu_map); | |
434 | device->driver_data = NULL; | |
2e4f1db4 | 435 | per_cpu(processors, pr->id) = NULL; |
ac212b69 RW |
436 | err_free_pr: |
437 | kfree(pr); | |
438 | return result; | |
439 | } | |
440 | ||
441 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
442 | /* -------------------------------------------------------------------------- | |
443 | Removal | |
444 | -------------------------------------------------------------------------- */ | |
445 | ||
446 | static void acpi_processor_remove(struct acpi_device *device) | |
447 | { | |
448 | struct acpi_processor *pr; | |
449 | ||
450 | if (!device || !acpi_driver_data(device)) | |
451 | return; | |
452 | ||
453 | pr = acpi_driver_data(device); | |
454 | if (pr->id >= nr_cpu_ids) | |
455 | goto out; | |
456 | ||
457 | /* | |
458 | * The only reason why we ever get here is CPU hot-removal. The CPU is | |
459 | * already offline and the ACPI device removal locking prevents it from | |
460 | * being put back online at this point. | |
461 | * | |
462 | * Unbind the driver from the processor device and detach it from the | |
463 | * ACPI companion object. | |
464 | */ | |
465 | device_release_driver(pr->dev); | |
466 | acpi_unbind_one(pr->dev); | |
467 | ||
468 | /* Clean up. */ | |
469 | per_cpu(processor_device_array, pr->id) = NULL; | |
2e4f1db4 | 470 | per_cpu(processors, pr->id) = NULL; |
ac212b69 | 471 | |
b9d10be7 TK |
472 | cpu_maps_update_begin(); |
473 | cpu_hotplug_begin(); | |
474 | ||
ac212b69 | 475 | /* Remove the CPU. */ |
ac212b69 | 476 | arch_unregister_cpu(pr->id); |
d02dc27d | 477 | acpi_unmap_cpu(pr->id); |
b9d10be7 TK |
478 | |
479 | cpu_hotplug_done(); | |
480 | cpu_maps_update_done(); | |
ac212b69 | 481 | |
1e385f6f YI |
482 | try_offline_node(cpu_to_node(pr->id)); |
483 | ||
ac212b69 RW |
484 | out: |
485 | free_cpumask_var(pr->throttling.shared_cpu_map); | |
486 | kfree(pr); | |
487 | } | |
488 | #endif /* CONFIG_ACPI_HOTPLUG_CPU */ | |
489 | ||
a2121167 SP |
490 | #ifdef CONFIG_X86 |
491 | static bool acpi_hwp_native_thermal_lvt_set; | |
492 | static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle, | |
493 | u32 lvl, | |
494 | void *context, | |
495 | void **rv) | |
496 | { | |
497 | u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953"; | |
498 | u32 capbuf[2]; | |
499 | struct acpi_osc_context osc_context = { | |
500 | .uuid_str = sb_uuid_str, | |
501 | .rev = 1, | |
502 | .cap.length = 8, | |
503 | .cap.pointer = capbuf, | |
504 | }; | |
505 | ||
506 | if (acpi_hwp_native_thermal_lvt_set) | |
507 | return AE_CTRL_TERMINATE; | |
508 | ||
509 | capbuf[0] = 0x0000; | |
510 | capbuf[1] = 0x1000; /* set bit 12 */ | |
511 | ||
512 | if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) { | |
513 | if (osc_context.ret.pointer && osc_context.ret.length > 1) { | |
514 | u32 *capbuf_ret = osc_context.ret.pointer; | |
515 | ||
516 | if (capbuf_ret[1] & 0x1000) { | |
517 | acpi_handle_info(handle, | |
518 | "_OSC native thermal LVT Acked\n"); | |
519 | acpi_hwp_native_thermal_lvt_set = true; | |
520 | } | |
521 | } | |
522 | kfree(osc_context.ret.pointer); | |
523 | } | |
524 | ||
525 | return AE_OK; | |
526 | } | |
527 | ||
528 | void __init acpi_early_processor_osc(void) | |
529 | { | |
530 | if (boot_cpu_has(X86_FEATURE_HWP)) { | |
531 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, | |
532 | ACPI_UINT32_MAX, | |
533 | acpi_hwp_native_thermal_lvt_osc, | |
534 | NULL, NULL, NULL); | |
535 | acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, | |
536 | acpi_hwp_native_thermal_lvt_osc, | |
537 | NULL, NULL); | |
538 | } | |
539 | } | |
540 | #endif | |
541 | ||
ac212b69 RW |
542 | /* |
543 | * The following ACPI IDs are known to be suitable for representing as | |
544 | * processor devices. | |
545 | */ | |
546 | static const struct acpi_device_id processor_device_ids[] = { | |
547 | ||
548 | { ACPI_PROCESSOR_OBJECT_HID, }, | |
549 | { ACPI_PROCESSOR_DEVICE_HID, }, | |
550 | ||
551 | { } | |
552 | }; | |
553 | ||
8ce344c6 | 554 | static struct acpi_scan_handler processor_handler = { |
ac212b69 RW |
555 | .ids = processor_device_ids, |
556 | .attach = acpi_processor_add, | |
557 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
558 | .detach = acpi_processor_remove, | |
559 | #endif | |
560 | .hotplug = { | |
561 | .enabled = true, | |
562 | }, | |
563 | }; | |
564 | ||
db62fda3 SH |
565 | static int acpi_processor_container_attach(struct acpi_device *dev, |
566 | const struct acpi_device_id *id) | |
567 | { | |
568 | return 1; | |
569 | } | |
570 | ||
571 | static const struct acpi_device_id processor_container_ids[] = { | |
572 | { ACPI_PROCESSOR_CONTAINER_HID, }, | |
573 | { } | |
574 | }; | |
575 | ||
576 | static struct acpi_scan_handler processor_container_handler = { | |
577 | .ids = processor_container_ids, | |
578 | .attach = acpi_processor_container_attach, | |
579 | }; | |
580 | ||
8e089eaa DL |
581 | /* The number of the unique processor IDs */ |
582 | static int nr_unique_ids __initdata; | |
583 | ||
584 | /* The number of the duplicate processor IDs */ | |
a77d6cd9 | 585 | static int nr_duplicate_ids; |
8e089eaa DL |
586 | |
587 | /* Used to store the unique processor IDs */ | |
588 | static int unique_processor_ids[] __initdata = { | |
589 | [0 ... NR_CPUS - 1] = -1, | |
590 | }; | |
591 | ||
592 | /* Used to store the duplicate processor IDs */ | |
a77d6cd9 | 593 | static int duplicate_processor_ids[] = { |
8e089eaa DL |
594 | [0 ... NR_CPUS - 1] = -1, |
595 | }; | |
596 | ||
597 | static void __init processor_validated_ids_update(int proc_id) | |
598 | { | |
599 | int i; | |
600 | ||
601 | if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS) | |
602 | return; | |
603 | ||
604 | /* | |
605 | * Firstly, compare the proc_id with duplicate IDs, if the proc_id is | |
606 | * already in the IDs, do nothing. | |
607 | */ | |
608 | for (i = 0; i < nr_duplicate_ids; i++) { | |
609 | if (duplicate_processor_ids[i] == proc_id) | |
610 | return; | |
611 | } | |
612 | ||
613 | /* | |
614 | * Secondly, compare the proc_id with unique IDs, if the proc_id is in | |
615 | * the IDs, put it in the duplicate IDs. | |
616 | */ | |
617 | for (i = 0; i < nr_unique_ids; i++) { | |
618 | if (unique_processor_ids[i] == proc_id) { | |
619 | duplicate_processor_ids[nr_duplicate_ids] = proc_id; | |
620 | nr_duplicate_ids++; | |
621 | return; | |
622 | } | |
623 | } | |
624 | ||
625 | /* | |
626 | * Lastly, the proc_id is a unique ID, put it in the unique IDs. | |
627 | */ | |
628 | unique_processor_ids[nr_unique_ids] = proc_id; | |
629 | nr_unique_ids++; | |
630 | } | |
631 | ||
632 | static acpi_status __init acpi_processor_ids_walk(acpi_handle handle, | |
633 | u32 lvl, | |
634 | void *context, | |
635 | void **rv) | |
636 | { | |
637 | acpi_status status; | |
8c8cb30f DL |
638 | acpi_object_type acpi_type; |
639 | unsigned long long uid; | |
8e089eaa DL |
640 | union acpi_object object = { 0 }; |
641 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
642 | ||
8c8cb30f | 643 | status = acpi_get_type(handle, &acpi_type); |
8e089eaa | 644 | if (ACPI_FAILURE(status)) |
8c8cb30f DL |
645 | return false; |
646 | ||
647 | switch (acpi_type) { | |
648 | case ACPI_TYPE_PROCESSOR: | |
649 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); | |
650 | if (ACPI_FAILURE(status)) | |
651 | goto err; | |
652 | uid = object.processor.proc_id; | |
653 | break; | |
654 | ||
655 | case ACPI_TYPE_DEVICE: | |
656 | status = acpi_evaluate_integer(handle, "_UID", NULL, &uid); | |
657 | if (ACPI_FAILURE(status)) | |
658 | goto err; | |
659 | break; | |
660 | default: | |
661 | goto err; | |
662 | } | |
663 | ||
664 | processor_validated_ids_update(uid); | |
665 | return true; | |
666 | ||
667 | err: | |
668 | acpi_handle_info(handle, "Invalid processor object\n"); | |
669 | return false; | |
8e089eaa | 670 | |
8e089eaa DL |
671 | } |
672 | ||
8c8cb30f | 673 | void __init acpi_processor_check_duplicates(void) |
8e089eaa | 674 | { |
8c8cb30f | 675 | /* check the correctness for all processors in ACPI namespace */ |
8e089eaa DL |
676 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, |
677 | ACPI_UINT32_MAX, | |
678 | acpi_processor_ids_walk, | |
679 | NULL, NULL, NULL); | |
8c8cb30f DL |
680 | acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk, |
681 | NULL, NULL); | |
8e089eaa DL |
682 | } |
683 | ||
a77d6cd9 | 684 | bool acpi_duplicate_processor_id(int proc_id) |
fd74da21 DL |
685 | { |
686 | int i; | |
687 | ||
688 | /* | |
689 | * compare the proc_id with duplicate IDs, if the proc_id is already | |
690 | * in the duplicate IDs, return true, otherwise, return false. | |
691 | */ | |
692 | for (i = 0; i < nr_duplicate_ids; i++) { | |
693 | if (duplicate_processor_ids[i] == proc_id) | |
694 | return true; | |
695 | } | |
696 | return false; | |
697 | } | |
698 | ||
ac212b69 RW |
699 | void __init acpi_processor_init(void) |
700 | { | |
8e089eaa | 701 | acpi_processor_check_duplicates(); |
ac212b69 | 702 | acpi_scan_add_handler_with_hotplug(&processor_handler, "processor"); |
db62fda3 | 703 | acpi_scan_add_handler(&processor_container_handler); |
ac212b69 | 704 | } |