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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/dmi.h>
44#include <linux/moduleparam.h>
Len Brown4f86d3a2007-10-03 18:58:00 -040045#include <linux/cpuidle.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090046#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#include <asm/io.h>
49#include <asm/system.h>
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
Len Browna192a952009-07-28 16:45:54 -040061#define PREFIX "ACPI: "
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#define ACPI_PROCESSOR_CLASS "processor"
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#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
Luming Yu01854e62007-05-26 22:49:58 +080070#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72#define ACPI_PROCESSOR_LIMIT_USER 0
73#define ACPI_PROCESSOR_LIMIT_THERMAL 1
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#define _COMPONENT ACPI_PROCESSOR_COMPONENT
Alex Chiang0131aa32010-02-22 12:11:08 -070076ACPI_MODULE_NAME("processor_driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Len Brownf52fd662007-02-12 22:42:12 -050078MODULE_AUTHOR("Paul Diefenbaugh");
Len Brown7cda93e2007-02-12 23:50:02 -050079MODULE_DESCRIPTION("ACPI Processor Driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070080MODULE_LICENSE("GPL");
81
Len Brown4be44fc2005-08-05 00:44:28 -040082static int acpi_processor_add(struct acpi_device *device);
Len Brown4be44fc2005-08-05 00:44:28 -040083static int acpi_processor_remove(struct acpi_device *device, int type);
Bjorn Helgaas7ec0a722009-03-30 17:48:24 +000084static void acpi_processor_notify(struct acpi_device *device, u32 event);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
86static int acpi_processor_handle_eject(struct acpi_processor *pr);
Luming Yu01854e62007-05-26 22:49:58 +080087
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Thomas Renninger1ba90e32007-07-23 14:44:41 +020089static const struct acpi_device_id processor_device_ids[] = {
Myron Stowead93a762008-11-04 14:52:55 -070090 {ACPI_PROCESSOR_OBJECT_HID, 0},
Bjorn Helgaas9eccbc22009-04-27 16:33:46 -060091 {"ACPI0007", 0},
Thomas Renninger1ba90e32007-07-23 14:44:41 +020092 {"", 0},
93};
94MODULE_DEVICE_TABLE(acpi, processor_device_ids);
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096static struct acpi_driver acpi_processor_driver = {
Len Brownc2b6705b2007-02-12 23:33:40 -050097 .name = "processor",
Len Brown4be44fc2005-08-05 00:44:28 -040098 .class = ACPI_PROCESSOR_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020099 .ids = processor_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -0400100 .ops = {
101 .add = acpi_processor_add,
102 .remove = acpi_processor_remove,
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000103 .suspend = acpi_processor_suspend,
104 .resume = acpi_processor_resume,
Bjorn Helgaas7ec0a722009-03-30 17:48:24 +0000105 .notify = acpi_processor_notify,
Len Brown4be44fc2005-08-05 00:44:28 -0400106 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107};
108
109#define INSTALL_NOTIFY_HANDLER 1
110#define UNINSTALL_NOTIFY_HANDLER 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Mike Travis706546d2008-06-09 16:22:23 -0700112DEFINE_PER_CPU(struct acpi_processor *, processors);
Naga Chumbalkar0f1d6832009-12-17 20:18:27 +0000113EXPORT_PER_CPU_SYMBOL(processors);
114
Andreas Mohr9f222712006-06-23 02:04:27 -0700115struct acpi_processor_errata errata __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117/* --------------------------------------------------------------------------
118 Errata Handling
119 -------------------------------------------------------------------------- */
120
Len Brown4be44fc2005-08-05 00:44:28 -0400121static int acpi_processor_errata_piix4(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Len Brown4be44fc2005-08-05 00:44:28 -0400123 u8 value1 = 0;
124 u8 value2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
127 if (!dev)
Patrick Mocheld550d982006-06-27 00:41:40 -0400128 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130 /*
131 * Note that 'dev' references the PIIX4 ACPI Controller.
132 */
133
Auke Kok44c10132007-06-08 15:46:36 -0700134 switch (dev->revision) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 case 0:
136 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
137 break;
138 case 1:
139 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
140 break;
141 case 2:
142 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
143 break;
144 case 3:
145 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
146 break;
147 default:
148 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
149 break;
150 }
151
Auke Kok44c10132007-06-08 15:46:36 -0700152 switch (dev->revision) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154 case 0: /* PIIX4 A-step */
155 case 1: /* PIIX4 B-step */
156 /*
157 * See specification changes #13 ("Manual Throttle Duty Cycle")
158 * and #14 ("Enabling and Disabling Manual Throttle"), plus
159 * erratum #5 ("STPCLK# Deassertion Time") from the January
160 * 2002 PIIX4 specification update. Applies to only older
161 * PIIX4 models.
162 */
163 errata.piix4.throttle = 1;
164
165 case 2: /* PIIX4E */
166 case 3: /* PIIX4M */
167 /*
168 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
169 * Livelock") from the January 2002 PIIX4 specification update.
170 * Applies to all PIIX4 models.
171 */
172
173 /*
174 * BM-IDE
175 * ------
176 * Find the PIIX4 IDE Controller and get the Bus Master IDE
177 * Status register address. We'll use this later to read
178 * each IDE controller's DMA status to make sure we catch all
179 * DMA activity.
180 */
181 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
Len Brown4be44fc2005-08-05 00:44:28 -0400182 PCI_DEVICE_ID_INTEL_82371AB,
183 PCI_ANY_ID, PCI_ANY_ID, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 if (dev) {
185 errata.piix4.bmisx = pci_resource_start(dev, 4);
186 pci_dev_put(dev);
187 }
188
189 /*
190 * Type-F DMA
191 * ----------
192 * Find the PIIX4 ISA Controller and read the Motherboard
193 * DMA controller's status to see if Type-F (Fast) DMA mode
194 * is enabled (bit 7) on either channel. Note that we'll
195 * disable C3 support if this is enabled, as some legacy
196 * devices won't operate well if fast DMA is disabled.
197 */
198 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
Len Brown4be44fc2005-08-05 00:44:28 -0400199 PCI_DEVICE_ID_INTEL_82371AB_0,
200 PCI_ANY_ID, PCI_ANY_ID, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 if (dev) {
202 pci_read_config_byte(dev, 0x76, &value1);
203 pci_read_config_byte(dev, 0x77, &value2);
204 if ((value1 & 0x80) || (value2 & 0x80))
205 errata.piix4.fdma = 1;
206 pci_dev_put(dev);
207 }
208
209 break;
210 }
211
212 if (errata.piix4.bmisx)
213 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400214 "Bus master activity detection (BM-IDE) erratum enabled\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 if (errata.piix4.fdma)
216 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400217 "Type-F DMA livelock erratum (C3 disabled)\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Patrick Mocheld550d982006-06-27 00:41:40 -0400219 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220}
221
Adrian Bunk8713cbe2005-09-02 17:16:48 -0400222static int acpi_processor_errata(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
Len Brown4be44fc2005-08-05 00:44:28 -0400224 int result = 0;
225 struct pci_dev *dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400229 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 /*
232 * PIIX4
233 */
234 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
Len Brown4be44fc2005-08-05 00:44:28 -0400235 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
236 PCI_ANY_ID, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 if (dev) {
238 result = acpi_processor_errata_piix4(dev);
239 pci_dev_put(dev);
240 }
241
Patrick Mocheld550d982006-06-27 00:41:40 -0400242 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245/* --------------------------------------------------------------------------
246 Driver Interface
247 -------------------------------------------------------------------------- */
248
Myron Stoweb26e9282008-11-04 14:53:00 -0700249static int acpi_processor_get_info(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
Len Brown4be44fc2005-08-05 00:44:28 -0400251 acpi_status status = 0;
252 union acpi_object object = { 0 };
253 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
Myron Stoweb26e9282008-11-04 14:53:00 -0700254 struct acpi_processor *pr;
255 int cpu_index, device_declaration = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400256 static int cpu0_initialized;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Myron Stoweb26e9282008-11-04 14:53:00 -0700258 pr = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400260 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262 if (num_online_cpus() > 1)
263 errata.smp = TRUE;
264
265 acpi_processor_errata(pr);
266
267 /*
268 * Check to see if we have bus mastering arbitration control. This
269 * is required for proper C3 usage (to maintain cache coherency).
270 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300271 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 pr->flags.bm_control = 1;
273 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400274 "Bus mastering arbitration control present\n"));
275 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400277 "No bus mastering arbitration control\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
Bjorn Helgaas6cc73b42009-04-27 16:33:41 -0600279 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
280 /* Declared with "Processor" statement; match ProcessorID */
281 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
282 if (ACPI_FAILURE(status)) {
283 printk(KERN_ERR PREFIX "Evaluating processor object\n");
284 return -ENODEV;
285 }
286
287 /*
288 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
289 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
290 * arch/xxx/acpi.c
291 */
292 pr->acpi_id = object.processor.proc_id;
293 } else {
Myron Stoweb26e9282008-11-04 14:53:00 -0700294 /*
295 * Declared with "Device" statement; match _UID.
296 * Note that we don't handle string _UIDs yet.
297 */
Matthew Wilcox27663c52008-10-10 02:22:59 -0400298 unsigned long long value;
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300299 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
300 NULL, &value);
301 if (ACPI_FAILURE(status)) {
Myron Stoweb26e9282008-11-04 14:53:00 -0700302 printk(KERN_ERR PREFIX
303 "Evaluating processor _UID [%#x]\n", status);
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300304 return -ENODEV;
305 }
Myron Stoweb26e9282008-11-04 14:53:00 -0700306 device_declaration = 1;
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300307 pr->acpi_id = value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 }
Alex Chiang2e9d5e42010-02-22 12:11:19 -0700309 cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Len Brown4be44fc2005-08-05 00:44:28 -0400311 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
Ashok Rajdf42baa2006-03-28 17:04:00 -0500312 if (!cpu0_initialized && (cpu_index == -1) &&
Len Brown4be44fc2005-08-05 00:44:28 -0400313 (num_online_cpus() == 1)) {
314 cpu_index = 0;
315 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
Len Brown4be44fc2005-08-05 00:44:28 -0400317 cpu0_initialized = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
Len Brown4be44fc2005-08-05 00:44:28 -0400319 pr->id = cpu_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Len Brown4be44fc2005-08-05 00:44:28 -0400321 /*
322 * Extra Processor objects may be enumerated on MP systems with
323 * less than the max # of CPUs. They should be ignored _iff
324 * they are physically not present.
325 */
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +0300326 if (pr->id == -1) {
Len Brown4be44fc2005-08-05 00:44:28 -0400327 if (ACPI_FAILURE
328 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400329 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400330 }
331 }
Zhao Yakui7a04b842009-06-24 11:46:44 +0800332 /*
333 * On some boxes several processors use the same processor bus id.
334 * But they are located in different scope. For example:
335 * \_SB.SCK0.CPU0
336 * \_SB.SCK1.CPU0
337 * Rename the processor device bus id. And the new bus id will be
338 * generated as the following format:
339 * CPU+CPU ID.
340 */
341 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
Len Brown4be44fc2005-08-05 00:44:28 -0400343 pr->acpi_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
345 if (!object.processor.pblk_address)
346 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
347 else if (object.processor.pblk_length != 6)
Len Brown64684632006-06-26 23:41:38 -0400348 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
349 object.processor.pblk_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 else {
351 pr->throttling.address = object.processor.pblk_address;
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300352 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
353 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 pr->pblk = object.processor.pblk_address;
356
357 /*
358 * We don't care about error returns - we just try to mark
359 * these reserved so that nobody else is confused into thinking
360 * that this region might be unused..
361 *
362 * (In particular, allocating the IO range for Cardbus)
363 */
364 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
365 }
366
Alex Chiangfe086a72008-04-29 15:05:29 -0700367 /*
368 * If ACPI describes a slot number for this CPU, we can use it
369 * ensure we get the right value in the "physical id" field
370 * of /proc/cpuinfo
371 */
372 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
373 if (ACPI_SUCCESS(status))
374 arch_fix_phys_package_id(pr->id, object.integer.value);
375
Patrick Mocheld550d982006-06-27 00:41:40 -0400376 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377}
378
Mike Travis706546d2008-06-09 16:22:23 -0700379static DEFINE_PER_CPU(void *, processor_device_array);
Venkatesh Pallipadicd8e2b42005-10-21 19:22:00 -0400380
Bjorn Helgaas7ec0a722009-03-30 17:48:24 +0000381static void acpi_processor_notify(struct acpi_device *device, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382{
Bjorn Helgaas7ec0a722009-03-30 17:48:24 +0000383 struct acpi_processor *pr = acpi_driver_data(device);
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300384 int saved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
386 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400387 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 switch (event) {
390 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300391 saved = pr->performance_platform_limit;
Zhao Yakuid81c45e2009-10-16 09:20:41 +0800392 acpi_processor_ppc_has_changed(pr, 1);
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300393 if (saved == pr->performance_platform_limit)
394 break;
Len Brown14e04fb2007-08-23 15:20:26 -0400395 acpi_bus_generate_proc_event(device, event,
Len Brown4be44fc2005-08-05 00:44:28 -0400396 pr->performance_platform_limit);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800397 acpi_bus_generate_netlink_event(device->pnp.device_class,
Kay Sievers07944692008-10-30 01:18:59 +0100398 dev_name(&device->dev), event,
Zhang Rui962ce8c2007-08-23 01:24:31 +0800399 pr->performance_platform_limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 break;
401 case ACPI_PROCESSOR_NOTIFY_POWER:
402 acpi_processor_cst_has_changed(pr);
Len Brown14e04fb2007-08-23 15:20:26 -0400403 acpi_bus_generate_proc_event(device, event, 0);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800404 acpi_bus_generate_netlink_event(device->pnp.device_class,
Kay Sievers07944692008-10-30 01:18:59 +0100405 dev_name(&device->dev), event, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 break;
Luming Yu01854e62007-05-26 22:49:58 +0800407 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
408 acpi_processor_tstate_has_changed(pr);
Len Brown14e04fb2007-08-23 15:20:26 -0400409 acpi_bus_generate_proc_event(device, event, 0);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800410 acpi_bus_generate_netlink_event(device->pnp.device_class,
Kay Sievers07944692008-10-30 01:18:59 +0100411 dev_name(&device->dev), event, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 default:
413 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400414 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 break;
416 }
417
Patrick Mocheld550d982006-06-27 00:41:40 -0400418 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419}
420
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200421static int acpi_cpu_soft_notify(struct notifier_block *nfb,
422 unsigned long action, void *hcpu)
423{
424 unsigned int cpu = (unsigned long)hcpu;
Mike Travis706546d2008-06-09 16:22:23 -0700425 struct acpi_processor *pr = per_cpu(processors, cpu);
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200426
427 if (action == CPU_ONLINE && pr) {
Zhao Yakuid81c45e2009-10-16 09:20:41 +0800428 acpi_processor_ppc_has_changed(pr, 0);
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200429 acpi_processor_cst_has_changed(pr);
430 acpi_processor_tstate_has_changed(pr);
431 }
432 return NOTIFY_OK;
433}
434
435static struct notifier_block acpi_cpu_notifier =
436{
437 .notifier_call = acpi_cpu_soft_notify,
438};
439
Rakib Mullick941b10f2009-11-05 16:51:40 -0500440static int __cpuinit acpi_processor_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
Len Brown4be44fc2005-08-05 00:44:28 -0400442 struct acpi_processor *pr = NULL;
Bjorn Helgaas970b0492009-06-22 20:41:19 +0000443 int result = 0;
444 struct sys_device *sysdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
Burman Yan36bcbec2006-12-19 12:56:11 -0800446 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400448 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
Yinghai Lueaa95842009-06-06 14:51:36 -0700450 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800451 kfree(pr);
452 return -ENOMEM;
453 }
454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 pr->handle = device->handle;
456 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
457 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700458 device->driver_data = pr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 result = acpi_processor_get_info(device);
461 if (result) {
462 /* Processor is physically not present */
463 return 0;
464 }
465
Thomas Renninger75cbfb92010-05-26 17:03:33 +0200466#ifdef CONFIG_SMP
467 if (pr->id >= setup_max_cpus && pr->id != 0)
468 return 0;
469#endif
470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
472
473 /*
474 * Buggy BIOS check
475 * ACPI id of processors can be reported wrongly by the BIOS.
476 * Don't trust it blindly
477 */
478 if (per_cpu(processor_device_array, pr->id) != NULL &&
479 per_cpu(processor_device_array, pr->id) != device) {
480 printk(KERN_WARNING "BIOS reported wrong ACPI id "
481 "for the processor\n");
Bjorn Helgaas970b0492009-06-22 20:41:19 +0000482 result = -ENODEV;
483 goto err_free_cpumask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 }
485 per_cpu(processor_device_array, pr->id) = device;
486
487 per_cpu(processors, pr->id) = pr;
488
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 sysdev = get_cpu_sysdev(pr->id);
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000490 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
491 result = -EFAULT;
Zhang Ruicef6e8a2010-12-06 15:04:15 +0800492 goto err_free_cpumask;
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000493 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495#ifdef CONFIG_CPU_FREQ
Zhao Yakuid81c45e2009-10-16 09:20:41 +0800496 acpi_processor_ppc_has_changed(pr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497#endif
498 acpi_processor_get_throttling_info(pr);
499 acpi_processor_get_limit_info(pr);
500
501
Len Brown541adf72010-05-22 17:03:29 -0400502 if (cpuidle_get_driver() == &acpi_idle_driver)
503 acpi_processor_power_init(pr, device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505 pr->cdev = thermal_cooling_device_register("Processor", device,
506 &processor_cooling_ops);
507 if (IS_ERR(pr->cdev)) {
508 result = PTR_ERR(pr->cdev);
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000509 goto err_power_exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 }
511
Mike Travis13c41152009-12-14 13:38:30 -0800512 dev_dbg(&device->dev, "registered as cooling_device%d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 pr->cdev->id);
514
515 result = sysfs_create_link(&device->dev.kobj,
516 &pr->cdev->device.kobj,
517 "thermal_cooling");
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000518 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 printk(KERN_ERR PREFIX "Create sysfs link\n");
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000520 goto err_thermal_unregister;
521 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 result = sysfs_create_link(&pr->cdev->device.kobj,
523 &device->dev.kobj,
524 "device");
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000525 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 printk(KERN_ERR PREFIX "Create sysfs link\n");
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000527 goto err_remove_sysfs;
528 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Patrick Mocheld550d982006-06-27 00:41:40 -0400530 return 0;
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000531
532err_remove_sysfs:
533 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
534err_thermal_unregister:
535 thermal_cooling_device_unregister(pr->cdev);
536err_power_exit:
537 acpi_processor_power_exit(pr, device);
Bjorn Helgaas970b0492009-06-22 20:41:19 +0000538err_free_cpumask:
539 free_cpumask_var(pr->throttling.shared_cpu_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
541 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542}
543
Len Brown4be44fc2005-08-05 00:44:28 -0400544static int acpi_processor_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545{
Len Brown4be44fc2005-08-05 00:44:28 -0400546 struct acpi_processor *pr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
549 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400550 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200552 pr = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800554 if (pr->id >= nr_cpu_ids)
555 goto free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557 if (type == ACPI_BUS_REMOVAL_EJECT) {
558 if (acpi_processor_handle_eject(pr))
Patrick Mocheld550d982006-06-27 00:41:40 -0400559 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 }
561
562 acpi_processor_power_exit(pr, device);
563
Zhang Rui9f1eb992008-04-29 02:36:07 -0400564 sysfs_remove_link(&device->dev.kobj, "sysdev");
565
Zhao Yakuif28bb452008-02-15 08:34:37 +0800566 if (pr->cdev) {
567 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
568 sysfs_remove_link(&pr->cdev->device.kobj, "device");
569 thermal_cooling_device_unregister(pr->cdev);
570 pr->cdev = NULL;
571 }
Zhang Ruid9460fd22008-01-17 15:51:23 +0800572
Mike Travis706546d2008-06-09 16:22:23 -0700573 per_cpu(processors, pr->id) = NULL;
574 per_cpu(processor_device_array, pr->id) = NULL;
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800575
576free:
577 free_cpumask_var(pr->throttling.shared_cpu_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 kfree(pr);
579
Patrick Mocheld550d982006-06-27 00:41:40 -0400580 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581}
582
583#ifdef CONFIG_ACPI_HOTPLUG_CPU
584/****************************************************************************
585 * Acpi processor hotplug support *
586 ****************************************************************************/
587
Len Brown4be44fc2005-08-05 00:44:28 -0400588static int is_processor_present(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589{
Len Brown4be44fc2005-08-05 00:44:28 -0400590 acpi_status status;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400591 unsigned long long sta = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
594 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
Zhang Ruicfaf3742008-01-09 02:17:47 -0500595
596 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
597 return 1;
598
Zhang Ruid0ce46f2008-02-23 01:53:09 -0500599 /*
600 * _STA is mandatory for a processor that supports hot plug
601 */
602 if (status == AE_NOT_FOUND)
603 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
604 "Processor does not support hot plug\n"));
605 else
606 ACPI_EXCEPTION((AE_INFO, status,
607 "Processor Device is not present"));
Zhang Ruicfaf3742008-01-09 02:17:47 -0500608 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609}
610
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611static
Len Brown4be44fc2005-08-05 00:44:28 -0400612int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613{
Len Brown4be44fc2005-08-05 00:44:28 -0400614 acpi_handle phandle;
615 struct acpi_device *pdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
618 if (acpi_get_parent(handle, &phandle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400619 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 }
621
622 if (acpi_bus_get_device(phandle, &pdev)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400623 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 }
625
626 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400627 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 }
629
Patrick Mocheld550d982006-06-27 00:41:40 -0400630 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631}
632
Sam Ravnborgb95e9e82008-02-17 13:22:48 +0100633static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
634 u32 event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635{
Len Brown4be44fc2005-08-05 00:44:28 -0400636 struct acpi_processor *pr;
637 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 int result;
639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
641 switch (event) {
642 case ACPI_NOTIFY_BUS_CHECK:
643 case ACPI_NOTIFY_DEVICE_CHECK:
Glauber Costad6f882e2008-03-04 15:06:36 -0800644 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
645 "Processor driver received %s event\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400646 (event == ACPI_NOTIFY_BUS_CHECK) ?
Glauber Costad6f882e2008-03-04 15:06:36 -0800647 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
649 if (!is_processor_present(handle))
650 break;
651
652 if (acpi_bus_get_device(handle, &device)) {
653 result = acpi_processor_device_add(handle, &device);
654 if (result)
Len Brown64684632006-06-26 23:41:38 -0400655 printk(KERN_ERR PREFIX
656 "Unable to add the device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 break;
658 }
Len Brown4be44fc2005-08-05 00:44:28 -0400659 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 case ACPI_NOTIFY_EJECT_REQUEST:
Len Brown4be44fc2005-08-05 00:44:28 -0400661 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
662 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
664 if (acpi_bus_get_device(handle, &device)) {
Len Brown64684632006-06-26 23:41:38 -0400665 printk(KERN_ERR PREFIX
666 "Device don't exist, dropping EJECT\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 break;
668 }
669 pr = acpi_driver_data(device);
670 if (!pr) {
Len Brown64684632006-06-26 23:41:38 -0400671 printk(KERN_ERR PREFIX
672 "Driver data is NULL, dropping EJECT\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400673 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 break;
676 default:
677 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400678 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 break;
680 }
681
Patrick Mocheld550d982006-06-27 00:41:40 -0400682 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683}
684
685static acpi_status
686processor_walk_namespace_cb(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400687 u32 lvl, void *context, void **rv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688{
Len Brown4be44fc2005-08-05 00:44:28 -0400689 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 int *action = context;
Len Brown4be44fc2005-08-05 00:44:28 -0400691 acpi_object_type type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
693 status = acpi_get_type(handle, &type);
694 if (ACPI_FAILURE(status))
Len Brown4be44fc2005-08-05 00:44:28 -0400695 return (AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
697 if (type != ACPI_TYPE_PROCESSOR)
Len Brown4be44fc2005-08-05 00:44:28 -0400698 return (AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
Len Brown4be44fc2005-08-05 00:44:28 -0400700 switch (*action) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 case INSTALL_NOTIFY_HANDLER:
702 acpi_install_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400703 ACPI_SYSTEM_NOTIFY,
704 acpi_processor_hotplug_notify,
705 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 break;
707 case UNINSTALL_NOTIFY_HANDLER:
708 acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400709 ACPI_SYSTEM_NOTIFY,
710 acpi_processor_hotplug_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 break;
712 default:
713 break;
714 }
715
Len Brown4be44fc2005-08-05 00:44:28 -0400716 return (AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717}
718
Len Brown4be44fc2005-08-05 00:44:28 -0400719static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
722 if (!is_processor_present(handle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400723 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 }
725
726 if (acpi_map_lsapic(handle, p_cpu))
Patrick Mocheld550d982006-06-27 00:41:40 -0400727 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
729 if (arch_register_cpu(*p_cpu)) {
730 acpi_unmap_lsapic(*p_cpu);
Patrick Mocheld550d982006-06-27 00:41:40 -0400731 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 }
733
Patrick Mocheld550d982006-06-27 00:41:40 -0400734 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735}
736
Len Brown4be44fc2005-08-05 00:44:28 -0400737static int acpi_processor_handle_eject(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738{
Zhang Ruib62b8ef2008-04-29 02:35:56 -0400739 if (cpu_online(pr->id))
740 cpu_down(pr->id);
741
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 arch_unregister_cpu(pr->id);
743 acpi_unmap_lsapic(pr->id);
Len Brown4be44fc2005-08-05 00:44:28 -0400744 return (0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745}
746#else
Len Brown4be44fc2005-08-05 00:44:28 -0400747static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748{
749 return AE_ERROR;
750}
Len Brown4be44fc2005-08-05 00:44:28 -0400751static int acpi_processor_handle_eject(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752{
Len Brown4be44fc2005-08-05 00:44:28 -0400753 return (-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754}
755#endif
756
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757static
758void acpi_processor_install_hotplug_notify(void)
759{
760#ifdef CONFIG_ACPI_HOTPLUG_CPU
761 int action = INSTALL_NOTIFY_HANDLER;
762 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
Len Brown4be44fc2005-08-05 00:44:28 -0400763 ACPI_ROOT_OBJECT,
764 ACPI_UINT32_MAX,
Lin Ming22635762009-11-13 10:06:08 +0800765 processor_walk_namespace_cb, NULL, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766#endif
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200767 register_hotcpu_notifier(&acpi_cpu_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768}
769
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770static
771void acpi_processor_uninstall_hotplug_notify(void)
772{
773#ifdef CONFIG_ACPI_HOTPLUG_CPU
774 int action = UNINSTALL_NOTIFY_HANDLER;
775 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
Len Brown4be44fc2005-08-05 00:44:28 -0400776 ACPI_ROOT_OBJECT,
777 ACPI_UINT32_MAX,
Lin Ming22635762009-11-13 10:06:08 +0800778 processor_walk_namespace_cb, NULL, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779#endif
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200780 unregister_hotcpu_notifier(&acpi_cpu_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781}
782
783/*
784 * We keep the driver loaded even when ACPI is not running.
785 * This is needed for the powernow-k8 driver, that works even without
786 * ACPI, but needs symbols from this driver
787 */
788
Len Brown4be44fc2005-08-05 00:44:28 -0400789static int __init acpi_processor_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790{
Len Brown4be44fc2005-08-05 00:44:28 -0400791 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
Yinghai Luce8442b2009-08-26 14:29:26 -0700793 if (acpi_disabled)
794 return 0;
795
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 memset(&errata, 0, sizeof(errata));
797
Len Brown26717172010-03-08 14:07:30 -0500798 if (!cpuidle_register_driver(&acpi_idle_driver)) {
Len Brown541adf72010-05-22 17:03:29 -0400799 printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",
800 acpi_idle_driver.name);
Len Brown26717172010-03-08 14:07:30 -0500801 } else {
Len Browne9a64ed2010-09-24 20:50:02 -0400802 printk(KERN_DEBUG "ACPI: acpi_idle yielding to %s\n",
Len Brown26717172010-03-08 14:07:30 -0500803 cpuidle_get_driver()->name);
804 }
Len Brown4f86d3a2007-10-03 18:58:00 -0400805
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 result = acpi_bus_register_driver(&acpi_processor_driver);
Len Brown4f86d3a2007-10-03 18:58:00 -0400807 if (result < 0)
808 goto out_cpuidle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
810 acpi_processor_install_hotplug_notify();
811
812 acpi_thermal_cpufreq_init();
813
814 acpi_processor_ppc_init();
815
Zhao Yakui11805092008-01-28 13:53:42 +0800816 acpi_processor_throttling_init();
817
Patrick Mocheld550d982006-06-27 00:41:40 -0400818 return 0;
Len Brown4f86d3a2007-10-03 18:58:00 -0400819
820out_cpuidle:
821 cpuidle_unregister_driver(&acpi_idle_driver);
822
Len Brown4f86d3a2007-10-03 18:58:00 -0400823 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824}
825
Len Brown4be44fc2005-08-05 00:44:28 -0400826static void __exit acpi_processor_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827{
Yinghai Luce8442b2009-08-26 14:29:26 -0700828 if (acpi_disabled)
829 return;
830
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 acpi_processor_ppc_exit();
832
833 acpi_thermal_cpufreq_exit();
834
835 acpi_processor_uninstall_hotplug_notify();
836
837 acpi_bus_unregister_driver(&acpi_processor_driver);
838
Len Brown4f86d3a2007-10-03 18:58:00 -0400839 cpuidle_unregister_driver(&acpi_idle_driver);
840
Patrick Mocheld550d982006-06-27 00:41:40 -0400841 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842}
843
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844module_init(acpi_processor_init);
845module_exit(acpi_processor_exit);
846
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847MODULE_ALIAS("processor");