Commit | Line | Data |
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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 AC |
167 | int __weak acpi_map_cpu(acpi_handle handle, |
168 | phys_cpuid_t physid, int *pcpu) | |
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 | ||
dc6db24d GZ |
185 | int __weak acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) |
186 | { | |
187 | return -ENODEV; | |
188 | } | |
189 | ||
ac212b69 RW |
190 | static int acpi_processor_hotadd_init(struct acpi_processor *pr) |
191 | { | |
192 | unsigned long long sta; | |
193 | acpi_status status; | |
194 | int ret; | |
195 | ||
ddcc18f5 | 196 | if (invalid_phys_cpuid(pr->phys_id)) |
4985c32e LT |
197 | return -ENODEV; |
198 | ||
ac212b69 RW |
199 | status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta); |
200 | if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) | |
201 | return -ENODEV; | |
202 | ||
b9d10be7 TK |
203 | cpu_maps_update_begin(); |
204 | cpu_hotplug_begin(); | |
205 | ||
d02dc27d | 206 | ret = acpi_map_cpu(pr->handle, pr->phys_id, &pr->id); |
ac212b69 | 207 | if (ret) |
b9d10be7 | 208 | goto out; |
ac212b69 RW |
209 | |
210 | ret = arch_register_cpu(pr->id); | |
211 | if (ret) { | |
d02dc27d | 212 | acpi_unmap_cpu(pr->id); |
b9d10be7 | 213 | goto out; |
ac212b69 RW |
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; | |
b9d10be7 TK |
223 | |
224 | out: | |
225 | cpu_hotplug_done(); | |
226 | cpu_maps_update_done(); | |
227 | return ret; | |
ac212b69 RW |
228 | } |
229 | #else | |
230 | static inline int acpi_processor_hotadd_init(struct acpi_processor *pr) | |
231 | { | |
232 | return -ENODEV; | |
233 | } | |
234 | #endif /* CONFIG_ACPI_HOTPLUG_CPU */ | |
235 | ||
236 | static 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); | |
05eb3cd8 | 241 | int device_declaration = 0; |
ac212b69 RW |
242 | acpi_status status = AE_OK; |
243 | static int cpu0_initialized; | |
6ebb5bc9 | 244 | unsigned long long value; |
ac212b69 | 245 | |
082e12a0 | 246 | acpi_processor_errata(); |
ac212b69 RW |
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 | ||
ac212b69 RW |
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 | */ | |
ac212b69 RW |
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 | } | |
ac212b69 | 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 | ||
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; | |
2e4f1db4 | 414 | per_cpu(processors, pr->id) = pr; |
ac212b69 RW |
415 | |
416 | dev = get_cpu_device(pr->id); | |
173a5a4c HG |
417 | if (!dev) { |
418 | result = -ENODEV; | |
419 | goto err; | |
420 | } | |
421 | ||
24dee1fc | 422 | result = acpi_bind_one(dev, device); |
ac212b69 RW |
423 | if (result) |
424 | goto err; | |
425 | ||
426 | pr->dev = dev; | |
ac212b69 RW |
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; | |
2e4f1db4 | 438 | per_cpu(processors, pr->id) = NULL; |
ac212b69 RW |
439 | err_free_pr: |
440 | kfree(pr); | |
441 | return result; | |
442 | } | |
443 | ||
444 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
445 | /* -------------------------------------------------------------------------- | |
446 | Removal | |
447 | -------------------------------------------------------------------------- */ | |
448 | ||
449 | static 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; | |
2e4f1db4 | 473 | per_cpu(processors, pr->id) = NULL; |
ac212b69 | 474 | |
b9d10be7 TK |
475 | cpu_maps_update_begin(); |
476 | cpu_hotplug_begin(); | |
477 | ||
ac212b69 | 478 | /* Remove the CPU. */ |
ac212b69 | 479 | arch_unregister_cpu(pr->id); |
d02dc27d | 480 | acpi_unmap_cpu(pr->id); |
b9d10be7 TK |
481 | |
482 | cpu_hotplug_done(); | |
483 | cpu_maps_update_done(); | |
ac212b69 | 484 | |
1e385f6f YI |
485 | try_offline_node(cpu_to_node(pr->id)); |
486 | ||
ac212b69 RW |
487 | out: |
488 | free_cpumask_var(pr->throttling.shared_cpu_map); | |
489 | kfree(pr); | |
490 | } | |
491 | #endif /* CONFIG_ACPI_HOTPLUG_CPU */ | |
492 | ||
a2121167 SP |
493 | #ifdef CONFIG_X86 |
494 | static bool acpi_hwp_native_thermal_lvt_set; | |
495 | static 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 | ||
531 | void __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 | ||
ac212b69 RW |
545 | /* |
546 | * The following ACPI IDs are known to be suitable for representing as | |
547 | * processor devices. | |
548 | */ | |
549 | static const struct acpi_device_id processor_device_ids[] = { | |
550 | ||
551 | { ACPI_PROCESSOR_OBJECT_HID, }, | |
552 | { ACPI_PROCESSOR_DEVICE_HID, }, | |
553 | ||
554 | { } | |
555 | }; | |
556 | ||
8ce344c6 | 557 | static struct acpi_scan_handler processor_handler = { |
ac212b69 RW |
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 | ||
db62fda3 SH |
568 | static int acpi_processor_container_attach(struct acpi_device *dev, |
569 | const struct acpi_device_id *id) | |
570 | { | |
571 | return 1; | |
572 | } | |
573 | ||
574 | static const struct acpi_device_id processor_container_ids[] = { | |
575 | { ACPI_PROCESSOR_CONTAINER_HID, }, | |
576 | { } | |
577 | }; | |
578 | ||
579 | static struct acpi_scan_handler processor_container_handler = { | |
580 | .ids = processor_container_ids, | |
581 | .attach = acpi_processor_container_attach, | |
582 | }; | |
583 | ||
8e089eaa DL |
584 | /* The number of the unique processor IDs */ |
585 | static int nr_unique_ids __initdata; | |
586 | ||
587 | /* The number of the duplicate processor IDs */ | |
588 | static int nr_duplicate_ids __initdata; | |
589 | ||
590 | /* Used to store the unique processor IDs */ | |
591 | static int unique_processor_ids[] __initdata = { | |
592 | [0 ... NR_CPUS - 1] = -1, | |
593 | }; | |
594 | ||
595 | /* Used to store the duplicate processor IDs */ | |
596 | static int duplicate_processor_ids[] __initdata = { | |
597 | [0 ... NR_CPUS - 1] = -1, | |
598 | }; | |
599 | ||
600 | static 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 | ||
635 | static 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 | ||
653 | static 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 | ||
fd74da21 DL |
662 | bool __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 | ||
ac212b69 RW |
677 | void __init acpi_processor_init(void) |
678 | { | |
8e089eaa | 679 | acpi_processor_check_duplicates(); |
ac212b69 | 680 | acpi_scan_add_handler_with_hotplug(&processor_handler, "processor"); |
db62fda3 | 681 | acpi_scan_add_handler(&processor_container_handler); |
ac212b69 | 682 | } |