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Rafael J. Wysockiac212b62013-05-03 00:26:22 +02001/*
2 * acpi_processor.c - ACPI processor enumeration support
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8 * Copyright (C) 2013, Intel Corporation
9 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License version 2 as published
13 * by the Free Software Foundation.
14 */
15
16#include <linux/acpi.h>
17#include <linux/device.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/pci.h>
21
22#include <acpi/processor.h>
23
24#include <asm/cpu.h>
25
26#include "internal.h"
27
28#define _COMPONENT ACPI_PROCESSOR_COMPONENT
29
30ACPI_MODULE_NAME("processor");
31
Rafael J. Wysocki2e4f1db2013-05-30 21:55:46 +020032DEFINE_PER_CPU(struct acpi_processor *, processors);
33EXPORT_PER_CPU_SYMBOL(processors);
34
Rafael J. Wysockiac212b62013-05-03 00:26:22 +020035/* --------------------------------------------------------------------------
36 Errata Handling
37 -------------------------------------------------------------------------- */
38
39struct acpi_processor_errata errata __read_mostly;
40EXPORT_SYMBOL_GPL(errata);
41
42static int acpi_processor_errata_piix4(struct pci_dev *dev)
43{
44 u8 value1 = 0;
45 u8 value2 = 0;
46
47
48 if (!dev)
49 return -EINVAL;
50
51 /*
52 * Note that 'dev' references the PIIX4 ACPI Controller.
53 */
54
55 switch (dev->revision) {
56 case 0:
57 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
58 break;
59 case 1:
60 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
61 break;
62 case 2:
63 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
64 break;
65 case 3:
66 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
67 break;
68 default:
69 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
70 break;
71 }
72
73 switch (dev->revision) {
74
75 case 0: /* PIIX4 A-step */
76 case 1: /* PIIX4 B-step */
77 /*
78 * See specification changes #13 ("Manual Throttle Duty Cycle")
79 * and #14 ("Enabling and Disabling Manual Throttle"), plus
80 * erratum #5 ("STPCLK# Deassertion Time") from the January
81 * 2002 PIIX4 specification update. Applies to only older
82 * PIIX4 models.
83 */
84 errata.piix4.throttle = 1;
85
86 case 2: /* PIIX4E */
87 case 3: /* PIIX4M */
88 /*
89 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
90 * Livelock") from the January 2002 PIIX4 specification update.
91 * Applies to all PIIX4 models.
92 */
93
94 /*
95 * BM-IDE
96 * ------
97 * Find the PIIX4 IDE Controller and get the Bus Master IDE
98 * Status register address. We'll use this later to read
99 * each IDE controller's DMA status to make sure we catch all
100 * DMA activity.
101 */
102 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
103 PCI_DEVICE_ID_INTEL_82371AB,
104 PCI_ANY_ID, PCI_ANY_ID, NULL);
105 if (dev) {
106 errata.piix4.bmisx = pci_resource_start(dev, 4);
107 pci_dev_put(dev);
108 }
109
110 /*
111 * Type-F DMA
112 * ----------
113 * Find the PIIX4 ISA Controller and read the Motherboard
114 * DMA controller's status to see if Type-F (Fast) DMA mode
115 * is enabled (bit 7) on either channel. Note that we'll
116 * disable C3 support if this is enabled, as some legacy
117 * devices won't operate well if fast DMA is disabled.
118 */
119 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
120 PCI_DEVICE_ID_INTEL_82371AB_0,
121 PCI_ANY_ID, PCI_ANY_ID, NULL);
122 if (dev) {
123 pci_read_config_byte(dev, 0x76, &value1);
124 pci_read_config_byte(dev, 0x77, &value2);
125 if ((value1 & 0x80) || (value2 & 0x80))
126 errata.piix4.fdma = 1;
127 pci_dev_put(dev);
128 }
129
130 break;
131 }
132
133 if (errata.piix4.bmisx)
134 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
135 "Bus master activity detection (BM-IDE) erratum enabled\n"));
136 if (errata.piix4.fdma)
137 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
138 "Type-F DMA livelock erratum (C3 disabled)\n"));
139
140 return 0;
141}
142
143static int acpi_processor_errata(struct acpi_processor *pr)
144{
145 int result = 0;
146 struct pci_dev *dev = NULL;
147
148
149 if (!pr)
150 return -EINVAL;
151
152 /*
153 * PIIX4
154 */
155 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
156 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
157 PCI_ANY_ID, NULL);
158 if (dev) {
159 result = acpi_processor_errata_piix4(dev);
160 pci_dev_put(dev);
161 }
162
163 return result;
164}
165
166/* --------------------------------------------------------------------------
167 Initialization
168 -------------------------------------------------------------------------- */
169
170#ifdef CONFIG_ACPI_HOTPLUG_CPU
171static int acpi_processor_hotadd_init(struct acpi_processor *pr)
172{
173 unsigned long long sta;
174 acpi_status status;
175 int ret;
176
177 status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
178 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
179 return -ENODEV;
180
Toshi Kanib9d10be2013-08-12 09:45:53 -0600181 cpu_maps_update_begin();
182 cpu_hotplug_begin();
183
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200184 ret = acpi_map_lsapic(pr->handle, &pr->id);
185 if (ret)
Toshi Kanib9d10be2013-08-12 09:45:53 -0600186 goto out;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200187
188 ret = arch_register_cpu(pr->id);
189 if (ret) {
190 acpi_unmap_lsapic(pr->id);
Toshi Kanib9d10be2013-08-12 09:45:53 -0600191 goto out;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200192 }
193
194 /*
195 * CPU got hot-added, but cpu_data is not initialized yet. Set a flag
196 * to delay cpu_idle/throttling initialization and do it when the CPU
197 * gets online for the first time.
198 */
199 pr_info("CPU%d has been hot-added\n", pr->id);
200 pr->flags.need_hotplug_init = 1;
Toshi Kanib9d10be2013-08-12 09:45:53 -0600201
202out:
203 cpu_hotplug_done();
204 cpu_maps_update_done();
205 return ret;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200206}
207#else
208static inline int acpi_processor_hotadd_init(struct acpi_processor *pr)
209{
210 return -ENODEV;
211}
212#endif /* CONFIG_ACPI_HOTPLUG_CPU */
213
214static int acpi_processor_get_info(struct acpi_device *device)
215{
216 union acpi_object object = { 0 };
217 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
218 struct acpi_processor *pr = acpi_driver_data(device);
219 int cpu_index, device_declaration = 0;
220 acpi_status status = AE_OK;
221 static int cpu0_initialized;
222
223 if (num_online_cpus() > 1)
224 errata.smp = TRUE;
225
226 acpi_processor_errata(pr);
227
228 /*
229 * Check to see if we have bus mastering arbitration control. This
230 * is required for proper C3 usage (to maintain cache coherency).
231 */
232 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
233 pr->flags.bm_control = 1;
234 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
235 "Bus mastering arbitration control present\n"));
236 } else
237 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
238 "No bus mastering arbitration control\n"));
239
240 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
241 /* Declared with "Processor" statement; match ProcessorID */
242 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
243 if (ACPI_FAILURE(status)) {
244 dev_err(&device->dev,
245 "Failed to evaluate processor object (0x%x)\n",
246 status);
247 return -ENODEV;
248 }
249
250 /*
251 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
252 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
253 * arch/xxx/acpi.c
254 */
255 pr->acpi_id = object.processor.proc_id;
256 } else {
257 /*
258 * Declared with "Device" statement; match _UID.
259 * Note that we don't handle string _UIDs yet.
260 */
261 unsigned long long value;
262 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
263 NULL, &value);
264 if (ACPI_FAILURE(status)) {
265 dev_err(&device->dev,
266 "Failed to evaluate processor _UID (0x%x)\n",
267 status);
268 return -ENODEV;
269 }
270 device_declaration = 1;
271 pr->acpi_id = value;
272 }
273 cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
274
275 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
276 if (!cpu0_initialized && (cpu_index == -1) &&
277 (num_online_cpus() == 1)) {
278 cpu_index = 0;
279 }
280
281 cpu0_initialized = 1;
282
283 pr->id = cpu_index;
284
285 /*
286 * Extra Processor objects may be enumerated on MP systems with
287 * less than the max # of CPUs. They should be ignored _iff
288 * they are physically not present.
289 */
290 if (pr->id == -1) {
291 int ret = acpi_processor_hotadd_init(pr);
292 if (ret)
293 return ret;
294 }
295 /*
296 * On some boxes several processors use the same processor bus id.
297 * But they are located in different scope. For example:
298 * \_SB.SCK0.CPU0
299 * \_SB.SCK1.CPU0
300 * Rename the processor device bus id. And the new bus id will be
301 * generated as the following format:
302 * CPU+CPU ID.
303 */
304 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
305 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
306 pr->acpi_id));
307
308 if (!object.processor.pblk_address)
309 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
310 else if (object.processor.pblk_length != 6)
311 dev_err(&device->dev, "Invalid PBLK length [%d]\n",
312 object.processor.pblk_length);
313 else {
314 pr->throttling.address = object.processor.pblk_address;
315 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
316 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
317
318 pr->pblk = object.processor.pblk_address;
319
320 /*
321 * We don't care about error returns - we just try to mark
322 * these reserved so that nobody else is confused into thinking
323 * that this region might be unused..
324 *
325 * (In particular, allocating the IO range for Cardbus)
326 */
327 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
328 }
329
330 /*
331 * If ACPI describes a slot number for this CPU, we can use it to
332 * ensure we get the right value in the "physical id" field
333 * of /proc/cpuinfo
334 */
335 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
336 if (ACPI_SUCCESS(status))
337 arch_fix_phys_package_id(pr->id, object.integer.value);
338
339 return 0;
340}
341
342/*
343 * Do not put anything in here which needs the core to be online.
344 * For example MSR access or setting up things which check for cpuinfo_x86
345 * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
346 * Such things have to be put in and set up by the processor driver's .probe().
347 */
348static DEFINE_PER_CPU(void *, processor_device_array);
349
Paul Gortmakerfe7bf102013-06-19 14:30:58 -0400350static int acpi_processor_add(struct acpi_device *device,
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200351 const struct acpi_device_id *id)
352{
353 struct acpi_processor *pr;
354 struct device *dev;
355 int result = 0;
356
357 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
358 if (!pr)
359 return -ENOMEM;
360
361 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
362 result = -ENOMEM;
363 goto err_free_pr;
364 }
365
366 pr->handle = device->handle;
367 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
368 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
369 device->driver_data = pr;
370
371 result = acpi_processor_get_info(device);
372 if (result) /* Processor is not physically present or unavailable */
373 return 0;
374
375#ifdef CONFIG_SMP
376 if (pr->id >= setup_max_cpus && pr->id != 0)
377 return 0;
378#endif
379
380 BUG_ON(pr->id >= nr_cpu_ids);
381
382 /*
383 * Buggy BIOS check.
384 * ACPI id of processors can be reported wrongly by the BIOS.
385 * Don't trust it blindly
386 */
387 if (per_cpu(processor_device_array, pr->id) != NULL &&
388 per_cpu(processor_device_array, pr->id) != device) {
389 dev_warn(&device->dev,
390 "BIOS reported wrong ACPI id %d for the processor\n",
391 pr->id);
392 /* Give up, but do not abort the namespace scan. */
393 goto err;
394 }
395 /*
396 * processor_device_array is not cleared on errors to allow buggy BIOS
397 * checks.
398 */
399 per_cpu(processor_device_array, pr->id) = device;
Rafael J. Wysocki2e4f1db2013-05-30 21:55:46 +0200400 per_cpu(processors, pr->id) = pr;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200401
402 dev = get_cpu_device(pr->id);
Hanjun Guo173a5a42013-05-31 11:36:08 +0800403 if (!dev) {
404 result = -ENODEV;
405 goto err;
406 }
407
Rafael J. Wysockibe547432013-05-23 10:40:56 +0200408 result = acpi_bind_one(dev, pr->handle);
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200409 if (result)
410 goto err;
411
412 pr->dev = dev;
413 dev->offline = pr->flags.need_hotplug_init;
414
415 /* Trigger the processor driver's .probe() if present. */
416 if (device_attach(dev) >= 0)
417 return 1;
418
419 dev_err(dev, "Processor driver could not be attached\n");
420 acpi_unbind_one(dev);
421
422 err:
423 free_cpumask_var(pr->throttling.shared_cpu_map);
424 device->driver_data = NULL;
Rafael J. Wysocki2e4f1db2013-05-30 21:55:46 +0200425 per_cpu(processors, pr->id) = NULL;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200426 err_free_pr:
427 kfree(pr);
428 return result;
429}
430
431#ifdef CONFIG_ACPI_HOTPLUG_CPU
432/* --------------------------------------------------------------------------
433 Removal
434 -------------------------------------------------------------------------- */
435
436static void acpi_processor_remove(struct acpi_device *device)
437{
438 struct acpi_processor *pr;
439
440 if (!device || !acpi_driver_data(device))
441 return;
442
443 pr = acpi_driver_data(device);
444 if (pr->id >= nr_cpu_ids)
445 goto out;
446
447 /*
448 * The only reason why we ever get here is CPU hot-removal. The CPU is
449 * already offline and the ACPI device removal locking prevents it from
450 * being put back online at this point.
451 *
452 * Unbind the driver from the processor device and detach it from the
453 * ACPI companion object.
454 */
455 device_release_driver(pr->dev);
456 acpi_unbind_one(pr->dev);
457
458 /* Clean up. */
459 per_cpu(processor_device_array, pr->id) = NULL;
Rafael J. Wysocki2e4f1db2013-05-30 21:55:46 +0200460 per_cpu(processors, pr->id) = NULL;
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200461
Toshi Kanib9d10be2013-08-12 09:45:53 -0600462 cpu_maps_update_begin();
463 cpu_hotplug_begin();
464
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200465 /* Remove the CPU. */
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200466 arch_unregister_cpu(pr->id);
467 acpi_unmap_lsapic(pr->id);
Toshi Kanib9d10be2013-08-12 09:45:53 -0600468
469 cpu_hotplug_done();
470 cpu_maps_update_done();
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200471
Yasuaki Ishimatsu1e385f62013-08-06 19:11:11 +0900472 try_offline_node(cpu_to_node(pr->id));
473
Rafael J. Wysockiac212b62013-05-03 00:26:22 +0200474 out:
475 free_cpumask_var(pr->throttling.shared_cpu_map);
476 kfree(pr);
477}
478#endif /* CONFIG_ACPI_HOTPLUG_CPU */
479
480/*
481 * The following ACPI IDs are known to be suitable for representing as
482 * processor devices.
483 */
484static const struct acpi_device_id processor_device_ids[] = {
485
486 { ACPI_PROCESSOR_OBJECT_HID, },
487 { ACPI_PROCESSOR_DEVICE_HID, },
488
489 { }
490};
491
492static struct acpi_scan_handler __refdata processor_handler = {
493 .ids = processor_device_ids,
494 .attach = acpi_processor_add,
495#ifdef CONFIG_ACPI_HOTPLUG_CPU
496 .detach = acpi_processor_remove,
497#endif
498 .hotplug = {
499 .enabled = true,
500 },
501};
502
503void __init acpi_processor_init(void)
504{
505 acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
506}