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1da177e4 LT |
1 | /* |
2 | * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $) | |
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 | * - Added processor hotplug support | |
9 | * | |
10 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or (at | |
15 | * your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | * General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License along | |
23 | * with this program; if not, write to the Free Software Foundation, Inc., | |
24 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
25 | * | |
26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
27 | * TBD: | |
28 | * 1. Make # power states dynamic. | |
29 | * 2. Support duty_cycle values that span bit 4. | |
30 | * 3. Optimize by having scheduler determine business instead of | |
31 | * having us try to calculate it here. | |
32 | * 4. Need C1 timing -- must modify kernel (IRQ handler) to get this. | |
33 | */ | |
34 | ||
35 | #include <linux/kernel.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/types.h> | |
39 | #include <linux/pci.h> | |
40 | #include <linux/pm.h> | |
41 | #include <linux/cpufreq.h> | |
42 | #include <linux/cpu.h> | |
1da177e4 LT |
43 | #include <linux/dmi.h> |
44 | #include <linux/moduleparam.h> | |
4f86d3a8 | 45 | #include <linux/cpuidle.h> |
5a0e3ad6 | 46 | #include <linux/slab.h> |
47db4547 | 47 | #include <linux/acpi.h> |
1da177e4 LT |
48 | |
49 | #include <asm/io.h> | |
1da177e4 LT |
50 | #include <asm/cpu.h> |
51 | #include <asm/delay.h> | |
52 | #include <asm/uaccess.h> | |
53 | #include <asm/processor.h> | |
54 | #include <asm/smp.h> | |
55 | #include <asm/acpi.h> | |
56 | ||
57 | #include <acpi/acpi_bus.h> | |
58 | #include <acpi/acpi_drivers.h> | |
59 | #include <acpi/processor.h> | |
60 | ||
a192a958 LB |
61 | #define PREFIX "ACPI: " |
62 | ||
1da177e4 | 63 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 LT |
64 | #define ACPI_PROCESSOR_DEVICE_NAME "Processor" |
65 | #define ACPI_PROCESSOR_FILE_INFO "info" | |
66 | #define ACPI_PROCESSOR_FILE_THROTTLING "throttling" | |
67 | #define ACPI_PROCESSOR_FILE_LIMIT "limit" | |
68 | #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 | |
69 | #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 | |
01854e69 | 70 | #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 |
9f324bda | 71 | #define ACPI_PROCESSOR_DEVICE_HID "ACPI0007" |
1da177e4 LT |
72 | |
73 | #define ACPI_PROCESSOR_LIMIT_USER 0 | |
74 | #define ACPI_PROCESSOR_LIMIT_THERMAL 1 | |
75 | ||
1da177e4 | 76 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
0131aa3d | 77 | ACPI_MODULE_NAME("processor_driver"); |
1da177e4 | 78 | |
f52fd66d | 79 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 80 | MODULE_DESCRIPTION("ACPI Processor Driver"); |
1da177e4 LT |
81 | MODULE_LICENSE("GPL"); |
82 | ||
4be44fcd | 83 | static int acpi_processor_add(struct acpi_device *device); |
4be44fcd | 84 | static int acpi_processor_remove(struct acpi_device *device, int type); |
7ec0a729 | 85 | static void acpi_processor_notify(struct acpi_device *device, u32 event); |
3bd81a87 | 86 | static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr); |
1da177e4 | 87 | static int acpi_processor_handle_eject(struct acpi_processor *pr); |
99b72508 | 88 | static int acpi_processor_start(struct acpi_processor *pr); |
1da177e4 | 89 | |
1ba90e3a | 90 | static const struct acpi_device_id processor_device_ids[] = { |
ad93a765 | 91 | {ACPI_PROCESSOR_OBJECT_HID, 0}, |
9f324bda | 92 | {ACPI_PROCESSOR_DEVICE_HID, 0}, |
1ba90e3a TR |
93 | {"", 0}, |
94 | }; | |
95 | MODULE_DEVICE_TABLE(acpi, processor_device_ids); | |
96 | ||
e8110b64 RW |
97 | static SIMPLE_DEV_PM_OPS(acpi_processor_pm, |
98 | acpi_processor_suspend, acpi_processor_resume); | |
99 | ||
1da177e4 | 100 | static struct acpi_driver acpi_processor_driver = { |
c2b6705b | 101 | .name = "processor", |
4be44fcd | 102 | .class = ACPI_PROCESSOR_CLASS, |
1ba90e3a | 103 | .ids = processor_device_ids, |
4be44fcd LB |
104 | .ops = { |
105 | .add = acpi_processor_add, | |
106 | .remove = acpi_processor_remove, | |
7ec0a729 | 107 | .notify = acpi_processor_notify, |
4be44fcd | 108 | }, |
e8110b64 | 109 | .drv.pm = &acpi_processor_pm, |
1da177e4 LT |
110 | }; |
111 | ||
112 | #define INSTALL_NOTIFY_HANDLER 1 | |
113 | #define UNINSTALL_NOTIFY_HANDLER 2 | |
1da177e4 | 114 | |
706546d0 | 115 | DEFINE_PER_CPU(struct acpi_processor *, processors); |
0f1d683f NC |
116 | EXPORT_PER_CPU_SYMBOL(processors); |
117 | ||
9f222718 | 118 | struct acpi_processor_errata errata __read_mostly; |
1da177e4 | 119 | |
1da177e4 LT |
120 | /* -------------------------------------------------------------------------- |
121 | Errata Handling | |
122 | -------------------------------------------------------------------------- */ | |
123 | ||
4be44fcd | 124 | static int acpi_processor_errata_piix4(struct pci_dev *dev) |
1da177e4 | 125 | { |
4be44fcd LB |
126 | u8 value1 = 0; |
127 | u8 value2 = 0; | |
1da177e4 | 128 | |
1da177e4 LT |
129 | |
130 | if (!dev) | |
d550d98d | 131 | return -EINVAL; |
1da177e4 LT |
132 | |
133 | /* | |
134 | * Note that 'dev' references the PIIX4 ACPI Controller. | |
135 | */ | |
136 | ||
44c10138 | 137 | switch (dev->revision) { |
1da177e4 LT |
138 | case 0: |
139 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); | |
140 | break; | |
141 | case 1: | |
142 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); | |
143 | break; | |
144 | case 2: | |
145 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); | |
146 | break; | |
147 | case 3: | |
148 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); | |
149 | break; | |
150 | default: | |
151 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); | |
152 | break; | |
153 | } | |
154 | ||
44c10138 | 155 | switch (dev->revision) { |
1da177e4 LT |
156 | |
157 | case 0: /* PIIX4 A-step */ | |
158 | case 1: /* PIIX4 B-step */ | |
159 | /* | |
160 | * See specification changes #13 ("Manual Throttle Duty Cycle") | |
161 | * and #14 ("Enabling and Disabling Manual Throttle"), plus | |
162 | * erratum #5 ("STPCLK# Deassertion Time") from the January | |
163 | * 2002 PIIX4 specification update. Applies to only older | |
164 | * PIIX4 models. | |
165 | */ | |
166 | errata.piix4.throttle = 1; | |
167 | ||
168 | case 2: /* PIIX4E */ | |
169 | case 3: /* PIIX4M */ | |
170 | /* | |
171 | * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA | |
172 | * Livelock") from the January 2002 PIIX4 specification update. | |
173 | * Applies to all PIIX4 models. | |
174 | */ | |
175 | ||
176 | /* | |
177 | * BM-IDE | |
178 | * ------ | |
179 | * Find the PIIX4 IDE Controller and get the Bus Master IDE | |
180 | * Status register address. We'll use this later to read | |
181 | * each IDE controller's DMA status to make sure we catch all | |
182 | * DMA activity. | |
183 | */ | |
184 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, | |
4be44fcd LB |
185 | PCI_DEVICE_ID_INTEL_82371AB, |
186 | PCI_ANY_ID, PCI_ANY_ID, NULL); | |
1da177e4 LT |
187 | if (dev) { |
188 | errata.piix4.bmisx = pci_resource_start(dev, 4); | |
189 | pci_dev_put(dev); | |
190 | } | |
191 | ||
192 | /* | |
193 | * Type-F DMA | |
194 | * ---------- | |
195 | * Find the PIIX4 ISA Controller and read the Motherboard | |
196 | * DMA controller's status to see if Type-F (Fast) DMA mode | |
197 | * is enabled (bit 7) on either channel. Note that we'll | |
198 | * disable C3 support if this is enabled, as some legacy | |
199 | * devices won't operate well if fast DMA is disabled. | |
200 | */ | |
201 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, | |
4be44fcd LB |
202 | PCI_DEVICE_ID_INTEL_82371AB_0, |
203 | PCI_ANY_ID, PCI_ANY_ID, NULL); | |
1da177e4 LT |
204 | if (dev) { |
205 | pci_read_config_byte(dev, 0x76, &value1); | |
206 | pci_read_config_byte(dev, 0x77, &value2); | |
207 | if ((value1 & 0x80) || (value2 & 0x80)) | |
208 | errata.piix4.fdma = 1; | |
209 | pci_dev_put(dev); | |
210 | } | |
211 | ||
212 | break; | |
213 | } | |
214 | ||
215 | if (errata.piix4.bmisx) | |
216 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 217 | "Bus master activity detection (BM-IDE) erratum enabled\n")); |
1da177e4 LT |
218 | if (errata.piix4.fdma) |
219 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 220 | "Type-F DMA livelock erratum (C3 disabled)\n")); |
1da177e4 | 221 | |
d550d98d | 222 | return 0; |
1da177e4 LT |
223 | } |
224 | ||
8713cbef | 225 | static int acpi_processor_errata(struct acpi_processor *pr) |
1da177e4 | 226 | { |
4be44fcd LB |
227 | int result = 0; |
228 | struct pci_dev *dev = NULL; | |
1da177e4 | 229 | |
1da177e4 LT |
230 | |
231 | if (!pr) | |
d550d98d | 232 | return -EINVAL; |
1da177e4 LT |
233 | |
234 | /* | |
235 | * PIIX4 | |
236 | */ | |
237 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, | |
4be44fcd LB |
238 | PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, |
239 | PCI_ANY_ID, NULL); | |
1da177e4 LT |
240 | if (dev) { |
241 | result = acpi_processor_errata_piix4(dev); | |
242 | pci_dev_put(dev); | |
243 | } | |
244 | ||
d550d98d | 245 | return result; |
1da177e4 LT |
246 | } |
247 | ||
1da177e4 LT |
248 | /* -------------------------------------------------------------------------- |
249 | Driver Interface | |
250 | -------------------------------------------------------------------------- */ | |
251 | ||
b26e9286 | 252 | static int acpi_processor_get_info(struct acpi_device *device) |
1da177e4 | 253 | { |
4be44fcd LB |
254 | acpi_status status = 0; |
255 | union acpi_object object = { 0 }; | |
256 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
b26e9286 MS |
257 | struct acpi_processor *pr; |
258 | int cpu_index, device_declaration = 0; | |
4be44fcd | 259 | static int cpu0_initialized; |
1da177e4 | 260 | |
b26e9286 | 261 | pr = acpi_driver_data(device); |
1da177e4 | 262 | if (!pr) |
d550d98d | 263 | return -EINVAL; |
1da177e4 LT |
264 | |
265 | if (num_online_cpus() > 1) | |
266 | errata.smp = TRUE; | |
267 | ||
268 | acpi_processor_errata(pr); | |
269 | ||
270 | /* | |
271 | * Check to see if we have bus mastering arbitration control. This | |
272 | * is required for proper C3 usage (to maintain cache coherency). | |
273 | */ | |
cee324b1 | 274 | if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { |
1da177e4 LT |
275 | pr->flags.bm_control = 1; |
276 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
277 | "Bus mastering arbitration control present\n")); |
278 | } else | |
1da177e4 | 279 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd | 280 | "No bus mastering arbitration control\n")); |
1da177e4 | 281 | |
6cc73b48 BH |
282 | if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) { |
283 | /* Declared with "Processor" statement; match ProcessorID */ | |
284 | status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); | |
285 | if (ACPI_FAILURE(status)) { | |
47db4547 TK |
286 | dev_err(&device->dev, |
287 | "Failed to evaluate processor object (0x%x)\n", | |
288 | status); | |
6cc73b48 BH |
289 | return -ENODEV; |
290 | } | |
291 | ||
292 | /* | |
293 | * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. | |
294 | * >>> 'acpi_get_processor_id(acpi_id, &id)' in | |
295 | * arch/xxx/acpi.c | |
296 | */ | |
297 | pr->acpi_id = object.processor.proc_id; | |
298 | } else { | |
b26e9286 MS |
299 | /* |
300 | * Declared with "Device" statement; match _UID. | |
301 | * Note that we don't handle string _UIDs yet. | |
302 | */ | |
27663c58 | 303 | unsigned long long value; |
11bf04c4 AS |
304 | status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, |
305 | NULL, &value); | |
306 | if (ACPI_FAILURE(status)) { | |
47db4547 TK |
307 | dev_err(&device->dev, |
308 | "Failed to evaluate processor _UID (0x%x)\n", | |
309 | status); | |
11bf04c4 AS |
310 | return -ENODEV; |
311 | } | |
b26e9286 | 312 | device_declaration = 1; |
11bf04c4 | 313 | pr->acpi_id = value; |
11bf04c4 | 314 | } |
2e9d5e4e | 315 | cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id); |
1da177e4 | 316 | |
4be44fcd | 317 | /* Handle UP system running SMP kernel, with no LAPIC in MADT */ |
df42baa0 | 318 | if (!cpu0_initialized && (cpu_index == -1) && |
4be44fcd LB |
319 | (num_online_cpus() == 1)) { |
320 | cpu_index = 0; | |
321 | } | |
322 | ||
323 | cpu0_initialized = 1; | |
324 | ||
325 | pr->id = cpu_index; | |
326 | ||
327 | /* | |
328 | * Extra Processor objects may be enumerated on MP systems with | |
329 | * less than the max # of CPUs. They should be ignored _iff | |
330 | * they are physically not present. | |
331 | */ | |
f18c5a08 | 332 | if (pr->id == -1) { |
3bd81a87 | 333 | if (ACPI_FAILURE(acpi_processor_hotadd_init(pr))) |
d550d98d | 334 | return -ENODEV; |
4be44fcd | 335 | } |
7a04b849 ZY |
336 | /* |
337 | * On some boxes several processors use the same processor bus id. | |
338 | * But they are located in different scope. For example: | |
339 | * \_SB.SCK0.CPU0 | |
340 | * \_SB.SCK1.CPU0 | |
341 | * Rename the processor device bus id. And the new bus id will be | |
342 | * generated as the following format: | |
343 | * CPU+CPU ID. | |
344 | */ | |
345 | sprintf(acpi_device_bid(device), "CPU%X", pr->id); | |
1da177e4 | 346 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, |
4be44fcd | 347 | pr->acpi_id)); |
1da177e4 LT |
348 | |
349 | if (!object.processor.pblk_address) | |
350 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); | |
351 | else if (object.processor.pblk_length != 6) | |
47db4547 | 352 | dev_err(&device->dev, "Invalid PBLK length [%d]\n", |
6468463a | 353 | object.processor.pblk_length); |
1da177e4 LT |
354 | else { |
355 | pr->throttling.address = object.processor.pblk_address; | |
cee324b1 AS |
356 | pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; |
357 | pr->throttling.duty_width = acpi_gbl_FADT.duty_width; | |
1da177e4 LT |
358 | |
359 | pr->pblk = object.processor.pblk_address; | |
360 | ||
361 | /* | |
362 | * We don't care about error returns - we just try to mark | |
363 | * these reserved so that nobody else is confused into thinking | |
364 | * that this region might be unused.. | |
365 | * | |
366 | * (In particular, allocating the IO range for Cardbus) | |
367 | */ | |
368 | request_region(pr->throttling.address, 6, "ACPI CPU throttle"); | |
369 | } | |
370 | ||
fe086a7b AC |
371 | /* |
372 | * If ACPI describes a slot number for this CPU, we can use it | |
373 | * ensure we get the right value in the "physical id" field | |
374 | * of /proc/cpuinfo | |
375 | */ | |
376 | status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); | |
377 | if (ACPI_SUCCESS(status)) | |
378 | arch_fix_phys_package_id(pr->id, object.integer.value); | |
379 | ||
d550d98d | 380 | return 0; |
1da177e4 LT |
381 | } |
382 | ||
706546d0 | 383 | static DEFINE_PER_CPU(void *, processor_device_array); |
cd8e2b48 | 384 | |
7ec0a729 | 385 | static void acpi_processor_notify(struct acpi_device *device, u32 event) |
1da177e4 | 386 | { |
7ec0a729 | 387 | struct acpi_processor *pr = acpi_driver_data(device); |
e790cc8b | 388 | int saved; |
1da177e4 LT |
389 | |
390 | if (!pr) | |
d550d98d | 391 | return; |
1da177e4 | 392 | |
1da177e4 LT |
393 | switch (event) { |
394 | case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: | |
e790cc8b | 395 | saved = pr->performance_platform_limit; |
d81c45e1 | 396 | acpi_processor_ppc_has_changed(pr, 1); |
e790cc8b AS |
397 | if (saved == pr->performance_platform_limit) |
398 | break; | |
14e04fb3 | 399 | acpi_bus_generate_proc_event(device, event, |
4be44fcd | 400 | pr->performance_platform_limit); |
962ce8ca | 401 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
0794469d | 402 | dev_name(&device->dev), event, |
962ce8ca | 403 | pr->performance_platform_limit); |
1da177e4 LT |
404 | break; |
405 | case ACPI_PROCESSOR_NOTIFY_POWER: | |
406 | acpi_processor_cst_has_changed(pr); | |
14e04fb3 | 407 | acpi_bus_generate_proc_event(device, event, 0); |
962ce8ca | 408 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
0794469d | 409 | dev_name(&device->dev), event, 0); |
1da177e4 | 410 | break; |
01854e69 LY |
411 | case ACPI_PROCESSOR_NOTIFY_THROTTLING: |
412 | acpi_processor_tstate_has_changed(pr); | |
14e04fb3 | 413 | acpi_bus_generate_proc_event(device, event, 0); |
962ce8ca | 414 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
0794469d | 415 | dev_name(&device->dev), event, 0); |
879dca01 | 416 | break; |
1da177e4 LT |
417 | default: |
418 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 419 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
420 | break; |
421 | } | |
422 | ||
d550d98d | 423 | return; |
1da177e4 LT |
424 | } |
425 | ||
729c6ba3 VP |
426 | static int acpi_cpu_soft_notify(struct notifier_block *nfb, |
427 | unsigned long action, void *hcpu) | |
428 | { | |
429 | unsigned int cpu = (unsigned long)hcpu; | |
706546d0 | 430 | struct acpi_processor *pr = per_cpu(processors, cpu); |
729c6ba3 VP |
431 | |
432 | if (action == CPU_ONLINE && pr) { | |
99b72508 TR |
433 | /* CPU got physically hotplugged and onlined the first time: |
434 | * Initialize missing things | |
435 | */ | |
436 | if (pr->flags.need_hotplug_init) { | |
47db4547 TK |
437 | pr_info("Will online and init hotplugged CPU: %d\n", |
438 | pr->id); | |
99b72508 TR |
439 | WARN(acpi_processor_start(pr), "Failed to start CPU:" |
440 | " %d\n", pr->id); | |
441 | pr->flags.need_hotplug_init = 0; | |
99b72508 TR |
442 | /* Normal CPU soft online event */ |
443 | } else { | |
444 | acpi_processor_ppc_has_changed(pr, 0); | |
b7db60f4 | 445 | acpi_processor_hotplug(pr); |
99b72508 TR |
446 | acpi_processor_reevaluate_tstate(pr, action); |
447 | acpi_processor_tstate_has_changed(pr); | |
448 | } | |
729c6ba3 | 449 | } |
5a344a50 ZY |
450 | if (action == CPU_DEAD && pr) { |
451 | /* invalidate the flag.throttling after one CPU is offline */ | |
452 | acpi_processor_reevaluate_tstate(pr, action); | |
453 | } | |
729c6ba3 VP |
454 | return NOTIFY_OK; |
455 | } | |
456 | ||
457 | static struct notifier_block acpi_cpu_notifier = | |
458 | { | |
459 | .notifier_call = acpi_cpu_soft_notify, | |
460 | }; | |
461 | ||
99b72508 TR |
462 | /* |
463 | * acpi_processor_start() is called by the cpu_hotplug_notifier func: | |
464 | * acpi_cpu_soft_notify(). Getting it __cpuinit{data} is difficult, the | |
465 | * root cause seem to be that acpi_processor_uninstall_hotplug_notify() | |
466 | * is in the module_exit (__exit) func. Allowing acpi_processor_start() | |
467 | * to not be in __cpuinit section, but being called from __cpuinit funcs | |
468 | * via __ref looks like the right thing to do here. | |
469 | */ | |
470 | static __ref int acpi_processor_start(struct acpi_processor *pr) | |
54d5dcc4 TR |
471 | { |
472 | struct acpi_device *device = per_cpu(processor_device_array, pr->id); | |
473 | int result = 0; | |
474 | ||
475 | #ifdef CONFIG_CPU_FREQ | |
476 | acpi_processor_ppc_has_changed(pr, 0); | |
976a0be0 | 477 | acpi_processor_load_module(pr); |
54d5dcc4 TR |
478 | #endif |
479 | acpi_processor_get_throttling_info(pr); | |
480 | acpi_processor_get_limit_info(pr); | |
481 | ||
482 | if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver) | |
38a991b6 | 483 | acpi_processor_power_init(pr); |
54d5dcc4 TR |
484 | |
485 | pr->cdev = thermal_cooling_device_register("Processor", device, | |
486 | &processor_cooling_ops); | |
487 | if (IS_ERR(pr->cdev)) { | |
488 | result = PTR_ERR(pr->cdev); | |
489 | goto err_power_exit; | |
490 | } | |
491 | ||
492 | dev_dbg(&device->dev, "registered as cooling_device%d\n", | |
493 | pr->cdev->id); | |
494 | ||
495 | result = sysfs_create_link(&device->dev.kobj, | |
496 | &pr->cdev->device.kobj, | |
497 | "thermal_cooling"); | |
498 | if (result) { | |
47db4547 TK |
499 | dev_err(&device->dev, |
500 | "Failed to create sysfs link 'thermal_cooling'\n"); | |
54d5dcc4 TR |
501 | goto err_thermal_unregister; |
502 | } | |
503 | result = sysfs_create_link(&pr->cdev->device.kobj, | |
504 | &device->dev.kobj, | |
505 | "device"); | |
506 | if (result) { | |
47db4547 TK |
507 | dev_err(&pr->cdev->device, |
508 | "Failed to create sysfs link 'device'\n"); | |
54d5dcc4 TR |
509 | goto err_remove_sysfs_thermal; |
510 | } | |
511 | ||
512 | return 0; | |
513 | ||
514 | err_remove_sysfs_thermal: | |
515 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); | |
516 | err_thermal_unregister: | |
517 | thermal_cooling_device_unregister(pr->cdev); | |
518 | err_power_exit: | |
38a991b6 | 519 | acpi_processor_power_exit(pr); |
54d5dcc4 TR |
520 | |
521 | return result; | |
522 | } | |
523 | ||
99b72508 TR |
524 | /* |
525 | * Do not put anything in here which needs the core to be online. | |
526 | * For example MSR access or setting up things which check for cpuinfo_x86 | |
527 | * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc. | |
528 | * Such things have to be put in and set up above in acpi_processor_start() | |
529 | */ | |
941b10fa | 530 | static int __cpuinit acpi_processor_add(struct acpi_device *device) |
1da177e4 | 531 | { |
4be44fcd | 532 | struct acpi_processor *pr = NULL; |
970b0492 | 533 | int result = 0; |
8a25a2fd | 534 | struct device *dev; |
1da177e4 | 535 | |
36bcbec7 | 536 | pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); |
1da177e4 | 537 | if (!pr) |
d550d98d | 538 | return -ENOMEM; |
1da177e4 | 539 | |
eaa95840 | 540 | if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { |
c80f5b31 JL |
541 | result = -ENOMEM; |
542 | goto err_free_pr; | |
2fdf66b4 RR |
543 | } |
544 | ||
1da177e4 LT |
545 | pr->handle = device->handle; |
546 | strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); | |
547 | strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); | |
db89b4f0 | 548 | device->driver_data = pr; |
1da177e4 | 549 | |
b26e9286 | 550 | result = acpi_processor_get_info(device); |
1da177e4 LT |
551 | if (result) { |
552 | /* Processor is physically not present */ | |
d550d98d | 553 | return 0; |
1da177e4 LT |
554 | } |
555 | ||
75cbfb97 TR |
556 | #ifdef CONFIG_SMP |
557 | if (pr->id >= setup_max_cpus && pr->id != 0) | |
558 | return 0; | |
559 | #endif | |
560 | ||
fbb43ab0 | 561 | BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); |
1da177e4 | 562 | |
cd8e2b48 VP |
563 | /* |
564 | * Buggy BIOS check | |
565 | * ACPI id of processors can be reported wrongly by the BIOS. | |
566 | * Don't trust it blindly | |
567 | */ | |
706546d0 MT |
568 | if (per_cpu(processor_device_array, pr->id) != NULL && |
569 | per_cpu(processor_device_array, pr->id) != device) { | |
47db4547 TK |
570 | dev_warn(&device->dev, |
571 | "BIOS reported wrong ACPI id %d for the processor\n", | |
572 | pr->id); | |
970b0492 BH |
573 | result = -ENODEV; |
574 | goto err_free_cpumask; | |
cd8e2b48 | 575 | } |
706546d0 | 576 | per_cpu(processor_device_array, pr->id) = device; |
cd8e2b48 | 577 | |
706546d0 | 578 | per_cpu(processors, pr->id) = pr; |
1da177e4 | 579 | |
8a25a2fd KS |
580 | dev = get_cpu_device(pr->id); |
581 | if (sysfs_create_link(&device->dev.kobj, &dev->kobj, "sysdev")) { | |
d4e05261 | 582 | result = -EFAULT; |
c80f5b31 | 583 | goto err_clear_processor; |
d4e05261 | 584 | } |
9f1eb99c | 585 | |
99b72508 TR |
586 | /* |
587 | * Do not start hotplugged CPUs now, but when they | |
588 | * are onlined the first time | |
589 | */ | |
590 | if (pr->flags.need_hotplug_init) | |
591 | return 0; | |
9030062f | 592 | |
54d5dcc4 TR |
593 | result = acpi_processor_start(pr); |
594 | if (result) | |
d4e05261 | 595 | goto err_remove_sysfs; |
d9460fd2 | 596 | |
d550d98d | 597 | return 0; |
d4e05261 BH |
598 | |
599 | err_remove_sysfs: | |
3333ea78 | 600 | sysfs_remove_link(&device->dev.kobj, "sysdev"); |
c80f5b31 JL |
601 | err_clear_processor: |
602 | /* | |
603 | * processor_device_array is not cleared to allow checks for buggy BIOS | |
604 | */ | |
605 | per_cpu(processors, pr->id) = NULL; | |
970b0492 BH |
606 | err_free_cpumask: |
607 | free_cpumask_var(pr->throttling.shared_cpu_map); | |
c80f5b31 JL |
608 | err_free_pr: |
609 | kfree(pr); | |
d550d98d | 610 | return result; |
1da177e4 LT |
611 | } |
612 | ||
4be44fcd | 613 | static int acpi_processor_remove(struct acpi_device *device, int type) |
1da177e4 | 614 | { |
4be44fcd | 615 | struct acpi_processor *pr = NULL; |
1da177e4 | 616 | |
1da177e4 LT |
617 | |
618 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 619 | return -EINVAL; |
1da177e4 | 620 | |
50dd0969 | 621 | pr = acpi_driver_data(device); |
1da177e4 | 622 | |
2fdf66b4 RR |
623 | if (pr->id >= nr_cpu_ids) |
624 | goto free; | |
1da177e4 LT |
625 | |
626 | if (type == ACPI_BUS_REMOVAL_EJECT) { | |
627 | if (acpi_processor_handle_eject(pr)) | |
d550d98d | 628 | return -EINVAL; |
1da177e4 LT |
629 | } |
630 | ||
38a991b6 | 631 | acpi_processor_power_exit(pr); |
1da177e4 | 632 | |
9f1eb99c ZR |
633 | sysfs_remove_link(&device->dev.kobj, "sysdev"); |
634 | ||
f28bb45e ZY |
635 | if (pr->cdev) { |
636 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); | |
637 | sysfs_remove_link(&pr->cdev->device.kobj, "device"); | |
638 | thermal_cooling_device_unregister(pr->cdev); | |
639 | pr->cdev = NULL; | |
640 | } | |
d9460fd2 | 641 | |
706546d0 MT |
642 | per_cpu(processors, pr->id) = NULL; |
643 | per_cpu(processor_device_array, pr->id) = NULL; | |
2fdf66b4 RR |
644 | |
645 | free: | |
646 | free_cpumask_var(pr->throttling.shared_cpu_map); | |
1da177e4 LT |
647 | kfree(pr); |
648 | ||
d550d98d | 649 | return 0; |
1da177e4 LT |
650 | } |
651 | ||
652 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
653 | /**************************************************************************** | |
654 | * Acpi processor hotplug support * | |
655 | ****************************************************************************/ | |
656 | ||
4be44fcd | 657 | static int is_processor_present(acpi_handle handle) |
1da177e4 | 658 | { |
4be44fcd | 659 | acpi_status status; |
27663c58 | 660 | unsigned long long sta = 0; |
1da177e4 | 661 | |
1da177e4 LT |
662 | |
663 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
cfaf3747 ZR |
664 | |
665 | if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) | |
666 | return 1; | |
667 | ||
d0ce46f5 ZR |
668 | /* |
669 | * _STA is mandatory for a processor that supports hot plug | |
670 | */ | |
671 | if (status == AE_NOT_FOUND) | |
672 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
673 | "Processor does not support hot plug\n")); | |
674 | else | |
675 | ACPI_EXCEPTION((AE_INFO, status, | |
676 | "Processor Device is not present")); | |
cfaf3747 | 677 | return 0; |
1da177e4 LT |
678 | } |
679 | ||
6430c9c1 JB |
680 | static void acpi_processor_hotplug_notify(acpi_handle handle, |
681 | u32 event, void *data) | |
1da177e4 | 682 | { |
4be44fcd | 683 | struct acpi_device *device = NULL; |
c5b18e22 | 684 | struct acpi_eject_event *ej_event = NULL; |
51af3b92 | 685 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */ |
1da177e4 LT |
686 | int result; |
687 | ||
1da177e4 LT |
688 | switch (event) { |
689 | case ACPI_NOTIFY_BUS_CHECK: | |
690 | case ACPI_NOTIFY_DEVICE_CHECK: | |
d6f882e1 GC |
691 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
692 | "Processor driver received %s event\n", | |
4be44fcd | 693 | (event == ACPI_NOTIFY_BUS_CHECK) ? |
d6f882e1 | 694 | "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); |
1da177e4 LT |
695 | |
696 | if (!is_processor_present(handle)) | |
697 | break; | |
698 | ||
51af3b92 TK |
699 | if (!acpi_bus_get_device(handle, &device)) |
700 | break; | |
701 | ||
636458de | 702 | result = acpi_bus_add(handle, &device); |
51af3b92 | 703 | if (result) { |
47db4547 | 704 | acpi_handle_err(handle, "Unable to add the device\n"); |
1da177e4 LT |
705 | break; |
706 | } | |
51af3b92 TK |
707 | |
708 | ost_code = ACPI_OST_SC_SUCCESS; | |
4be44fcd | 709 | break; |
51af3b92 | 710 | |
1da177e4 | 711 | case ACPI_NOTIFY_EJECT_REQUEST: |
4be44fcd LB |
712 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
713 | "received ACPI_NOTIFY_EJECT_REQUEST\n")); | |
1da177e4 LT |
714 | |
715 | if (acpi_bus_get_device(handle, &device)) { | |
47db4547 TK |
716 | acpi_handle_err(handle, |
717 | "Device don't exist, dropping EJECT\n"); | |
1da177e4 LT |
718 | break; |
719 | } | |
c5b18e22 | 720 | if (!acpi_driver_data(device)) { |
47db4547 TK |
721 | acpi_handle_err(handle, |
722 | "Driver data is NULL, dropping EJECT\n"); | |
51af3b92 | 723 | break; |
1da177e4 | 724 | } |
51af3b92 | 725 | |
c5b18e22 TK |
726 | ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL); |
727 | if (!ej_event) { | |
47db4547 | 728 | acpi_handle_err(handle, "No memory, dropping EJECT\n"); |
c5b18e22 TK |
729 | break; |
730 | } | |
731 | ||
732 | ej_event->handle = handle; | |
733 | ej_event->event = ACPI_NOTIFY_EJECT_REQUEST; | |
734 | acpi_os_hotplug_execute(acpi_bus_hot_remove_device, | |
735 | (void *)ej_event); | |
736 | ||
737 | /* eject is performed asynchronously */ | |
738 | return; | |
51af3b92 | 739 | |
1da177e4 LT |
740 | default: |
741 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 742 | "Unsupported event [0x%x]\n", event)); |
51af3b92 TK |
743 | |
744 | /* non-hotplug event; possibly handled by other handler */ | |
745 | return; | |
1da177e4 LT |
746 | } |
747 | ||
51af3b92 TK |
748 | /* Inform firmware that the hotplug operation has completed */ |
749 | (void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL); | |
d550d98d | 750 | return; |
1da177e4 LT |
751 | } |
752 | ||
9f324bda TK |
753 | static acpi_status is_processor_device(acpi_handle handle) |
754 | { | |
755 | struct acpi_device_info *info; | |
756 | char *hid; | |
757 | acpi_status status; | |
758 | ||
759 | status = acpi_get_object_info(handle, &info); | |
760 | if (ACPI_FAILURE(status)) | |
761 | return status; | |
762 | ||
763 | if (info->type == ACPI_TYPE_PROCESSOR) { | |
764 | kfree(info); | |
765 | return AE_OK; /* found a processor object */ | |
766 | } | |
767 | ||
768 | if (!(info->valid & ACPI_VALID_HID)) { | |
769 | kfree(info); | |
770 | return AE_ERROR; | |
771 | } | |
772 | ||
773 | hid = info->hardware_id.string; | |
774 | if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) { | |
775 | kfree(info); | |
776 | return AE_ERROR; | |
777 | } | |
778 | ||
779 | kfree(info); | |
780 | return AE_OK; /* found a processor device object */ | |
781 | } | |
782 | ||
1da177e4 LT |
783 | static acpi_status |
784 | processor_walk_namespace_cb(acpi_handle handle, | |
4be44fcd | 785 | u32 lvl, void *context, void **rv) |
1da177e4 | 786 | { |
4be44fcd | 787 | acpi_status status; |
1da177e4 | 788 | int *action = context; |
1da177e4 | 789 | |
9f324bda | 790 | status = is_processor_device(handle); |
1da177e4 | 791 | if (ACPI_FAILURE(status)) |
9f324bda | 792 | return AE_OK; /* not a processor; continue to walk */ |
1da177e4 | 793 | |
4be44fcd | 794 | switch (*action) { |
1da177e4 LT |
795 | case INSTALL_NOTIFY_HANDLER: |
796 | acpi_install_notify_handler(handle, | |
4be44fcd LB |
797 | ACPI_SYSTEM_NOTIFY, |
798 | acpi_processor_hotplug_notify, | |
799 | NULL); | |
1da177e4 LT |
800 | break; |
801 | case UNINSTALL_NOTIFY_HANDLER: | |
802 | acpi_remove_notify_handler(handle, | |
4be44fcd LB |
803 | ACPI_SYSTEM_NOTIFY, |
804 | acpi_processor_hotplug_notify); | |
1da177e4 LT |
805 | break; |
806 | default: | |
807 | break; | |
808 | } | |
809 | ||
9f324bda TK |
810 | /* found a processor; skip walking underneath */ |
811 | return AE_CTRL_DEPTH; | |
1da177e4 LT |
812 | } |
813 | ||
3bd81a87 | 814 | static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr) |
1da177e4 | 815 | { |
3bd81a87 | 816 | acpi_handle handle = pr->handle; |
1da177e4 LT |
817 | |
818 | if (!is_processor_present(handle)) { | |
d550d98d | 819 | return AE_ERROR; |
1da177e4 LT |
820 | } |
821 | ||
3bd81a87 | 822 | if (acpi_map_lsapic(handle, &pr->id)) |
d550d98d | 823 | return AE_ERROR; |
1da177e4 | 824 | |
3bd81a87 TR |
825 | if (arch_register_cpu(pr->id)) { |
826 | acpi_unmap_lsapic(pr->id); | |
d550d98d | 827 | return AE_ERROR; |
1da177e4 LT |
828 | } |
829 | ||
99b72508 TR |
830 | /* CPU got hot-plugged, but cpu_data is not initialized yet |
831 | * Set flag to delay cpu_idle/throttling initialization | |
832 | * in: | |
833 | * acpi_processor_add() | |
834 | * acpi_processor_get_info() | |
835 | * and do it when the CPU gets online the first time | |
836 | * TBD: Cleanup above functions and try to do this more elegant. | |
837 | */ | |
47db4547 | 838 | pr_info("CPU %d got hotplugged\n", pr->id); |
99b72508 TR |
839 | pr->flags.need_hotplug_init = 1; |
840 | ||
d550d98d | 841 | return AE_OK; |
1da177e4 LT |
842 | } |
843 | ||
4be44fcd | 844 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
1da177e4 | 845 | { |
b62b8ef9 ZR |
846 | if (cpu_online(pr->id)) |
847 | cpu_down(pr->id); | |
848 | ||
5e5041f3 YI |
849 | get_online_cpus(); |
850 | /* | |
851 | * The cpu might become online again at this point. So we check whether | |
852 | * the cpu has been onlined or not. If the cpu became online, it means | |
853 | * that someone wants to use the cpu. So acpi_processor_handle_eject() | |
854 | * returns -EAGAIN. | |
855 | */ | |
856 | if (unlikely(cpu_online(pr->id))) { | |
857 | put_online_cpus(); | |
858 | pr_warn("Failed to remove CPU %d, because other task " | |
859 | "brought the CPU back online\n", pr->id); | |
860 | return -EAGAIN; | |
861 | } | |
1da177e4 LT |
862 | arch_unregister_cpu(pr->id); |
863 | acpi_unmap_lsapic(pr->id); | |
5e5041f3 | 864 | put_online_cpus(); |
4be44fcd | 865 | return (0); |
1da177e4 LT |
866 | } |
867 | #else | |
3bd81a87 | 868 | static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr) |
1da177e4 LT |
869 | { |
870 | return AE_ERROR; | |
871 | } | |
4be44fcd | 872 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
1da177e4 | 873 | { |
4be44fcd | 874 | return (-EINVAL); |
1da177e4 LT |
875 | } |
876 | #endif | |
877 | ||
1da177e4 LT |
878 | static |
879 | void acpi_processor_install_hotplug_notify(void) | |
880 | { | |
881 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
882 | int action = INSTALL_NOTIFY_HANDLER; | |
9f324bda | 883 | acpi_walk_namespace(ACPI_TYPE_ANY, |
4be44fcd LB |
884 | ACPI_ROOT_OBJECT, |
885 | ACPI_UINT32_MAX, | |
2263576c | 886 | processor_walk_namespace_cb, NULL, &action, NULL); |
1da177e4 | 887 | #endif |
729c6ba3 | 888 | register_hotcpu_notifier(&acpi_cpu_notifier); |
1da177e4 LT |
889 | } |
890 | ||
1da177e4 LT |
891 | static |
892 | void acpi_processor_uninstall_hotplug_notify(void) | |
893 | { | |
894 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
895 | int action = UNINSTALL_NOTIFY_HANDLER; | |
9f324bda | 896 | acpi_walk_namespace(ACPI_TYPE_ANY, |
4be44fcd LB |
897 | ACPI_ROOT_OBJECT, |
898 | ACPI_UINT32_MAX, | |
2263576c | 899 | processor_walk_namespace_cb, NULL, &action, NULL); |
1da177e4 | 900 | #endif |
729c6ba3 | 901 | unregister_hotcpu_notifier(&acpi_cpu_notifier); |
1da177e4 LT |
902 | } |
903 | ||
904 | /* | |
905 | * We keep the driver loaded even when ACPI is not running. | |
906 | * This is needed for the powernow-k8 driver, that works even without | |
907 | * ACPI, but needs symbols from this driver | |
908 | */ | |
909 | ||
4be44fcd | 910 | static int __init acpi_processor_init(void) |
1da177e4 | 911 | { |
4be44fcd | 912 | int result = 0; |
1da177e4 | 913 | |
ce8442b5 YL |
914 | if (acpi_disabled) |
915 | return 0; | |
916 | ||
1da177e4 | 917 | result = acpi_bus_register_driver(&acpi_processor_driver); |
4f86d3a8 | 918 | if (result < 0) |
46bcfad7 | 919 | return result; |
1da177e4 LT |
920 | |
921 | acpi_processor_install_hotplug_notify(); | |
922 | ||
923 | acpi_thermal_cpufreq_init(); | |
924 | ||
925 | acpi_processor_ppc_init(); | |
926 | ||
1180509f ZY |
927 | acpi_processor_throttling_init(); |
928 | ||
d550d98d | 929 | return 0; |
1da177e4 LT |
930 | } |
931 | ||
4be44fcd | 932 | static void __exit acpi_processor_exit(void) |
1da177e4 | 933 | { |
ce8442b5 YL |
934 | if (acpi_disabled) |
935 | return; | |
936 | ||
1da177e4 LT |
937 | acpi_processor_ppc_exit(); |
938 | ||
939 | acpi_thermal_cpufreq_exit(); | |
940 | ||
941 | acpi_processor_uninstall_hotplug_notify(); | |
942 | ||
943 | acpi_bus_unregister_driver(&acpi_processor_driver); | |
944 | ||
d550d98d | 945 | return; |
1da177e4 LT |
946 | } |
947 | ||
1da177e4 LT |
948 | module_init(acpi_processor_init); |
949 | module_exit(acpi_processor_exit); | |
950 | ||
1da177e4 | 951 | MODULE_ALIAS("processor"); |