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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <asm/cpu.h>
50#include <asm/delay.h>
51#include <asm/uaccess.h>
52#include <asm/processor.h>
53#include <asm/smp.h>
54#include <asm/acpi.h>
55
56#include <acpi/acpi_bus.h>
57#include <acpi/acpi_drivers.h>
58#include <acpi/processor.h>
59
Len Browna192a952009-07-28 16:45:54 -040060#define PREFIX "ACPI: "
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#define ACPI_PROCESSOR_CLASS "processor"
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
64#define ACPI_PROCESSOR_FILE_INFO "info"
65#define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
66#define ACPI_PROCESSOR_FILE_LIMIT "limit"
67#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
68#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
Luming Yu01854e62007-05-26 22:49:58 +080069#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
Toshi Kani9f324bd2012-03-19 13:08:02 -060070#define ACPI_PROCESSOR_DEVICE_HID "ACPI0007"
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);
Thomas Renninger3bd81a82012-01-17 22:40:07 +010085static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086static int acpi_processor_handle_eject(struct acpi_processor *pr);
Thomas Renninger99b72502012-01-19 18:18:43 +010087static int acpi_processor_start(struct acpi_processor *pr);
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},
Toshi Kani9f324bd2012-03-19 13:08:02 -060091 {ACPI_PROCESSOR_DEVICE_HID, 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) {
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100327 if (ACPI_FAILURE(acpi_processor_hotadd_init(pr)))
Patrick Mocheld550d982006-06-27 00:41:40 -0400328 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400329 }
Zhao Yakui7a04b842009-06-24 11:46:44 +0800330 /*
331 * On some boxes several processors use the same processor bus id.
332 * But they are located in different scope. For example:
333 * \_SB.SCK0.CPU0
334 * \_SB.SCK1.CPU0
335 * Rename the processor device bus id. And the new bus id will be
336 * generated as the following format:
337 * CPU+CPU ID.
338 */
339 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
Len Brown4be44fc2005-08-05 00:44:28 -0400341 pr->acpi_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 if (!object.processor.pblk_address)
344 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
345 else if (object.processor.pblk_length != 6)
Len Brown64684632006-06-26 23:41:38 -0400346 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
347 object.processor.pblk_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 else {
349 pr->throttling.address = object.processor.pblk_address;
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300350 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
351 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
353 pr->pblk = object.processor.pblk_address;
354
355 /*
356 * We don't care about error returns - we just try to mark
357 * these reserved so that nobody else is confused into thinking
358 * that this region might be unused..
359 *
360 * (In particular, allocating the IO range for Cardbus)
361 */
362 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
363 }
364
Alex Chiangfe086a72008-04-29 15:05:29 -0700365 /*
366 * If ACPI describes a slot number for this CPU, we can use it
367 * ensure we get the right value in the "physical id" field
368 * of /proc/cpuinfo
369 */
370 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
371 if (ACPI_SUCCESS(status))
372 arch_fix_phys_package_id(pr->id, object.integer.value);
373
Patrick Mocheld550d982006-06-27 00:41:40 -0400374 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375}
376
Mike Travis706546d2008-06-09 16:22:23 -0700377static DEFINE_PER_CPU(void *, processor_device_array);
Venkatesh Pallipadicd8e2b42005-10-21 19:22:00 -0400378
Bjorn Helgaas7ec0a722009-03-30 17:48:24 +0000379static void acpi_processor_notify(struct acpi_device *device, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380{
Bjorn Helgaas7ec0a722009-03-30 17:48:24 +0000381 struct acpi_processor *pr = acpi_driver_data(device);
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300382 int saved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
384 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400385 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 switch (event) {
388 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300389 saved = pr->performance_platform_limit;
Zhao Yakuid81c45e2009-10-16 09:20:41 +0800390 acpi_processor_ppc_has_changed(pr, 1);
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300391 if (saved == pr->performance_platform_limit)
392 break;
Len Brown14e04fb2007-08-23 15:20:26 -0400393 acpi_bus_generate_proc_event(device, event,
Len Brown4be44fc2005-08-05 00:44:28 -0400394 pr->performance_platform_limit);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800395 acpi_bus_generate_netlink_event(device->pnp.device_class,
Kay Sievers07944692008-10-30 01:18:59 +0100396 dev_name(&device->dev), event,
Zhang Rui962ce8c2007-08-23 01:24:31 +0800397 pr->performance_platform_limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 break;
399 case ACPI_PROCESSOR_NOTIFY_POWER:
400 acpi_processor_cst_has_changed(pr);
Len Brown14e04fb2007-08-23 15:20:26 -0400401 acpi_bus_generate_proc_event(device, event, 0);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800402 acpi_bus_generate_netlink_event(device->pnp.device_class,
Kay Sievers07944692008-10-30 01:18:59 +0100403 dev_name(&device->dev), event, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 break;
Luming Yu01854e62007-05-26 22:49:58 +0800405 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
406 acpi_processor_tstate_has_changed(pr);
Len Brown14e04fb2007-08-23 15:20:26 -0400407 acpi_bus_generate_proc_event(device, event, 0);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800408 acpi_bus_generate_netlink_event(device->pnp.device_class,
Kay Sievers07944692008-10-30 01:18:59 +0100409 dev_name(&device->dev), event, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 default:
411 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400412 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 break;
414 }
415
Patrick Mocheld550d982006-06-27 00:41:40 -0400416 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417}
418
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200419static int acpi_cpu_soft_notify(struct notifier_block *nfb,
420 unsigned long action, void *hcpu)
421{
422 unsigned int cpu = (unsigned long)hcpu;
Mike Travis706546d2008-06-09 16:22:23 -0700423 struct acpi_processor *pr = per_cpu(processors, cpu);
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200424
425 if (action == CPU_ONLINE && pr) {
Thomas Renninger99b72502012-01-19 18:18:43 +0100426 /* CPU got physically hotplugged and onlined the first time:
427 * Initialize missing things
428 */
429 if (pr->flags.need_hotplug_init) {
430 struct cpuidle_driver *idle_driver =
431 cpuidle_get_driver();
432
433 printk(KERN_INFO "Will online and init hotplugged "
434 "CPU: %d\n", pr->id);
435 WARN(acpi_processor_start(pr), "Failed to start CPU:"
436 " %d\n", pr->id);
437 pr->flags.need_hotplug_init = 0;
438 if (idle_driver && !strcmp(idle_driver->name,
439 "intel_idle")) {
440 intel_idle_cpu_init(pr->id);
441 }
442 /* Normal CPU soft online event */
443 } else {
444 acpi_processor_ppc_has_changed(pr, 0);
445 acpi_processor_cst_has_changed(pr);
446 acpi_processor_reevaluate_tstate(pr, action);
447 acpi_processor_tstate_has_changed(pr);
448 }
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200449 }
Zhao Yakui5a344a52011-01-10 16:35:45 +0800450 if (action == CPU_DEAD && pr) {
451 /* invalidate the flag.throttling after one CPU is offline */
452 acpi_processor_reevaluate_tstate(pr, action);
453 }
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200454 return NOTIFY_OK;
455}
456
457static struct notifier_block acpi_cpu_notifier =
458{
459 .notifier_call = acpi_cpu_soft_notify,
460};
461
Thomas Renninger99b72502012-01-19 18:18:43 +0100462/*
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 */
470static __ref int acpi_processor_start(struct acpi_processor *pr)
Thomas Renninger54d5dcc2012-01-19 18:18:42 +0100471{
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);
Yinghai Lu976a0be2012-02-07 11:45:57 -0800477 acpi_processor_load_module(pr);
Thomas Renninger54d5dcc2012-01-19 18:18:42 +0100478#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)
483 acpi_processor_power_init(pr, device);
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) {
499 printk(KERN_ERR PREFIX "Create sysfs link\n");
500 goto err_thermal_unregister;
501 }
502 result = sysfs_create_link(&pr->cdev->device.kobj,
503 &device->dev.kobj,
504 "device");
505 if (result) {
506 printk(KERN_ERR PREFIX "Create sysfs link\n");
507 goto err_remove_sysfs_thermal;
508 }
509
510 return 0;
511
512err_remove_sysfs_thermal:
513 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
514err_thermal_unregister:
515 thermal_cooling_device_unregister(pr->cdev);
516err_power_exit:
517 acpi_processor_power_exit(pr, device);
518
519 return result;
520}
521
Thomas Renninger99b72502012-01-19 18:18:43 +0100522/*
523 * Do not put anything in here which needs the core to be online.
524 * For example MSR access or setting up things which check for cpuinfo_x86
525 * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
526 * Such things have to be put in and set up above in acpi_processor_start()
527 */
Rakib Mullick941b10f2009-11-05 16:51:40 -0500528static int __cpuinit acpi_processor_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529{
Len Brown4be44fc2005-08-05 00:44:28 -0400530 struct acpi_processor *pr = NULL;
Bjorn Helgaas970b0492009-06-22 20:41:19 +0000531 int result = 0;
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800532 struct device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Burman Yan36bcbec2006-12-19 12:56:11 -0800534 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400536 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Yinghai Lueaa95842009-06-06 14:51:36 -0700538 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
Julia Lawallc80f5b32012-03-15 09:32:05 +0100539 result = -ENOMEM;
540 goto err_free_pr;
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800541 }
542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 pr->handle = device->handle;
544 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
545 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700546 device->driver_data = pr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 result = acpi_processor_get_info(device);
549 if (result) {
550 /* Processor is physically not present */
551 return 0;
552 }
553
Thomas Renninger75cbfb92010-05-26 17:03:33 +0200554#ifdef CONFIG_SMP
555 if (pr->id >= setup_max_cpus && pr->id != 0)
556 return 0;
557#endif
558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
560
561 /*
562 * Buggy BIOS check
563 * ACPI id of processors can be reported wrongly by the BIOS.
564 * Don't trust it blindly
565 */
566 if (per_cpu(processor_device_array, pr->id) != NULL &&
567 per_cpu(processor_device_array, pr->id) != device) {
568 printk(KERN_WARNING "BIOS reported wrong ACPI id "
569 "for the processor\n");
Bjorn Helgaas970b0492009-06-22 20:41:19 +0000570 result = -ENODEV;
571 goto err_free_cpumask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 }
573 per_cpu(processor_device_array, pr->id) = device;
574
575 per_cpu(processors, pr->id) = pr;
576
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800577 dev = get_cpu_device(pr->id);
578 if (sysfs_create_link(&device->dev.kobj, &dev->kobj, "sysdev")) {
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000579 result = -EFAULT;
Julia Lawallc80f5b32012-03-15 09:32:05 +0100580 goto err_clear_processor;
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000581 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
Thomas Renninger99b72502012-01-19 18:18:43 +0100583 /*
584 * Do not start hotplugged CPUs now, but when they
585 * are onlined the first time
586 */
587 if (pr->flags.need_hotplug_init)
588 return 0;
589
Thomas Renninger54d5dcc2012-01-19 18:18:42 +0100590 result = acpi_processor_start(pr);
591 if (result)
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000592 goto err_remove_sysfs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Patrick Mocheld550d982006-06-27 00:41:40 -0400594 return 0;
Bjorn Helgaasd4e05262009-06-22 20:41:09 +0000595
596err_remove_sysfs:
Thomas Renninger3333ea72011-11-17 23:37:00 +0100597 sysfs_remove_link(&device->dev.kobj, "sysdev");
Julia Lawallc80f5b32012-03-15 09:32:05 +0100598err_clear_processor:
599 /*
600 * processor_device_array is not cleared to allow checks for buggy BIOS
601 */
602 per_cpu(processors, pr->id) = NULL;
Bjorn Helgaas970b0492009-06-22 20:41:19 +0000603err_free_cpumask:
604 free_cpumask_var(pr->throttling.shared_cpu_map);
Julia Lawallc80f5b32012-03-15 09:32:05 +0100605err_free_pr:
606 kfree(pr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608}
609
Len Brown4be44fc2005-08-05 00:44:28 -0400610static int acpi_processor_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611{
Len Brown4be44fc2005-08-05 00:44:28 -0400612 struct acpi_processor *pr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
615 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400616 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200618 pr = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800620 if (pr->id >= nr_cpu_ids)
621 goto free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
623 if (type == ACPI_BUS_REMOVAL_EJECT) {
624 if (acpi_processor_handle_eject(pr))
Patrick Mocheld550d982006-06-27 00:41:40 -0400625 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 }
627
628 acpi_processor_power_exit(pr, device);
629
Zhang Rui9f1eb992008-04-29 02:36:07 -0400630 sysfs_remove_link(&device->dev.kobj, "sysdev");
631
Zhao Yakuif28bb452008-02-15 08:34:37 +0800632 if (pr->cdev) {
633 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
634 sysfs_remove_link(&pr->cdev->device.kobj, "device");
635 thermal_cooling_device_unregister(pr->cdev);
636 pr->cdev = NULL;
637 }
Zhang Ruid9460fd22008-01-17 15:51:23 +0800638
Mike Travis706546d2008-06-09 16:22:23 -0700639 per_cpu(processors, pr->id) = NULL;
640 per_cpu(processor_device_array, pr->id) = NULL;
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800641
642free:
643 free_cpumask_var(pr->throttling.shared_cpu_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 kfree(pr);
645
Patrick Mocheld550d982006-06-27 00:41:40 -0400646 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647}
648
649#ifdef CONFIG_ACPI_HOTPLUG_CPU
650/****************************************************************************
651 * Acpi processor hotplug support *
652 ****************************************************************************/
653
Len Brown4be44fc2005-08-05 00:44:28 -0400654static int is_processor_present(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
Len Brown4be44fc2005-08-05 00:44:28 -0400656 acpi_status status;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400657 unsigned long long sta = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
660 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
Zhang Ruicfaf3742008-01-09 02:17:47 -0500661
662 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
663 return 1;
664
Zhang Ruid0ce46f2008-02-23 01:53:09 -0500665 /*
666 * _STA is mandatory for a processor that supports hot plug
667 */
668 if (status == AE_NOT_FOUND)
669 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
670 "Processor does not support hot plug\n"));
671 else
672 ACPI_EXCEPTION((AE_INFO, status,
673 "Processor Device is not present"));
Zhang Ruicfaf3742008-01-09 02:17:47 -0500674 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675}
676
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677static
Len Brown4be44fc2005-08-05 00:44:28 -0400678int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
Len Brown4be44fc2005-08-05 00:44:28 -0400680 acpi_handle phandle;
681 struct acpi_device *pdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
684 if (acpi_get_parent(handle, &phandle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400685 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 }
687
688 if (acpi_bus_get_device(phandle, &pdev)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400689 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 }
691
692 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400693 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 }
695
Patrick Mocheld550d982006-06-27 00:41:40 -0400696 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697}
698
Jan Beulich6430c9c2011-02-17 16:33:53 +0000699static void acpi_processor_hotplug_notify(acpi_handle handle,
700 u32 event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701{
Len Brown4be44fc2005-08-05 00:44:28 -0400702 struct acpi_processor *pr;
703 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 int result;
705
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706
707 switch (event) {
708 case ACPI_NOTIFY_BUS_CHECK:
709 case ACPI_NOTIFY_DEVICE_CHECK:
Glauber Costad6f882e2008-03-04 15:06:36 -0800710 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
711 "Processor driver received %s event\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400712 (event == ACPI_NOTIFY_BUS_CHECK) ?
Glauber Costad6f882e2008-03-04 15:06:36 -0800713 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
715 if (!is_processor_present(handle))
716 break;
717
718 if (acpi_bus_get_device(handle, &device)) {
719 result = acpi_processor_device_add(handle, &device);
720 if (result)
Len Brown64684632006-06-26 23:41:38 -0400721 printk(KERN_ERR PREFIX
722 "Unable to add the device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 break;
724 }
Len Brown4be44fc2005-08-05 00:44:28 -0400725 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 case ACPI_NOTIFY_EJECT_REQUEST:
Len Brown4be44fc2005-08-05 00:44:28 -0400727 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
728 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729
730 if (acpi_bus_get_device(handle, &device)) {
Len Brown64684632006-06-26 23:41:38 -0400731 printk(KERN_ERR PREFIX
732 "Device don't exist, dropping EJECT\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 break;
734 }
735 pr = acpi_driver_data(device);
736 if (!pr) {
Len Brown64684632006-06-26 23:41:38 -0400737 printk(KERN_ERR PREFIX
738 "Driver data is NULL, dropping EJECT\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400739 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 break;
742 default:
743 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400744 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 break;
746 }
747
Patrick Mocheld550d982006-06-27 00:41:40 -0400748 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749}
750
Toshi Kani9f324bd2012-03-19 13:08:02 -0600751static acpi_status is_processor_device(acpi_handle handle)
752{
753 struct acpi_device_info *info;
754 char *hid;
755 acpi_status status;
756
757 status = acpi_get_object_info(handle, &info);
758 if (ACPI_FAILURE(status))
759 return status;
760
761 if (info->type == ACPI_TYPE_PROCESSOR) {
762 kfree(info);
763 return AE_OK; /* found a processor object */
764 }
765
766 if (!(info->valid & ACPI_VALID_HID)) {
767 kfree(info);
768 return AE_ERROR;
769 }
770
771 hid = info->hardware_id.string;
772 if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) {
773 kfree(info);
774 return AE_ERROR;
775 }
776
777 kfree(info);
778 return AE_OK; /* found a processor device object */
779}
780
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781static acpi_status
782processor_walk_namespace_cb(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400783 u32 lvl, void *context, void **rv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784{
Len Brown4be44fc2005-08-05 00:44:28 -0400785 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 int *action = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Toshi Kani9f324bd2012-03-19 13:08:02 -0600788 status = is_processor_device(handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 if (ACPI_FAILURE(status))
Toshi Kani9f324bd2012-03-19 13:08:02 -0600790 return AE_OK; /* not a processor; continue to walk */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791
Len Brown4be44fc2005-08-05 00:44:28 -0400792 switch (*action) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 case INSTALL_NOTIFY_HANDLER:
794 acpi_install_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400795 ACPI_SYSTEM_NOTIFY,
796 acpi_processor_hotplug_notify,
797 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 break;
799 case UNINSTALL_NOTIFY_HANDLER:
800 acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400801 ACPI_SYSTEM_NOTIFY,
802 acpi_processor_hotplug_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 break;
804 default:
805 break;
806 }
807
Toshi Kani9f324bd2012-03-19 13:08:02 -0600808 /* found a processor; skip walking underneath */
809 return AE_CTRL_DEPTH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810}
811
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100812static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813{
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100814 acpi_handle handle = pr->handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815
816 if (!is_processor_present(handle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400817 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 }
819
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100820 if (acpi_map_lsapic(handle, &pr->id))
Patrick Mocheld550d982006-06-27 00:41:40 -0400821 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100823 if (arch_register_cpu(pr->id)) {
824 acpi_unmap_lsapic(pr->id);
Patrick Mocheld550d982006-06-27 00:41:40 -0400825 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 }
827
Thomas Renninger99b72502012-01-19 18:18:43 +0100828 /* CPU got hot-plugged, but cpu_data is not initialized yet
829 * Set flag to delay cpu_idle/throttling initialization
830 * in:
831 * acpi_processor_add()
832 * acpi_processor_get_info()
833 * and do it when the CPU gets online the first time
834 * TBD: Cleanup above functions and try to do this more elegant.
835 */
836 printk(KERN_INFO "CPU %d got hotplugged\n", pr->id);
837 pr->flags.need_hotplug_init = 1;
838
Patrick Mocheld550d982006-06-27 00:41:40 -0400839 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840}
841
Len Brown4be44fc2005-08-05 00:44:28 -0400842static int acpi_processor_handle_eject(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843{
Zhang Ruib62b8ef2008-04-29 02:35:56 -0400844 if (cpu_online(pr->id))
845 cpu_down(pr->id);
846
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 arch_unregister_cpu(pr->id);
848 acpi_unmap_lsapic(pr->id);
Len Brown4be44fc2005-08-05 00:44:28 -0400849 return (0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850}
851#else
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100852static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853{
854 return AE_ERROR;
855}
Len Brown4be44fc2005-08-05 00:44:28 -0400856static int acpi_processor_handle_eject(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857{
Len Brown4be44fc2005-08-05 00:44:28 -0400858 return (-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859}
860#endif
861
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862static
863void acpi_processor_install_hotplug_notify(void)
864{
865#ifdef CONFIG_ACPI_HOTPLUG_CPU
866 int action = INSTALL_NOTIFY_HANDLER;
Toshi Kani9f324bd2012-03-19 13:08:02 -0600867 acpi_walk_namespace(ACPI_TYPE_ANY,
Len Brown4be44fc2005-08-05 00:44:28 -0400868 ACPI_ROOT_OBJECT,
869 ACPI_UINT32_MAX,
Lin Ming22635762009-11-13 10:06:08 +0800870 processor_walk_namespace_cb, NULL, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871#endif
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200872 register_hotcpu_notifier(&acpi_cpu_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873}
874
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875static
876void acpi_processor_uninstall_hotplug_notify(void)
877{
878#ifdef CONFIG_ACPI_HOTPLUG_CPU
879 int action = UNINSTALL_NOTIFY_HANDLER;
Toshi Kani9f324bd2012-03-19 13:08:02 -0600880 acpi_walk_namespace(ACPI_TYPE_ANY,
Len Brown4be44fc2005-08-05 00:44:28 -0400881 ACPI_ROOT_OBJECT,
882 ACPI_UINT32_MAX,
Lin Ming22635762009-11-13 10:06:08 +0800883 processor_walk_namespace_cb, NULL, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884#endif
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200885 unregister_hotcpu_notifier(&acpi_cpu_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886}
887
888/*
889 * We keep the driver loaded even when ACPI is not running.
890 * This is needed for the powernow-k8 driver, that works even without
891 * ACPI, but needs symbols from this driver
892 */
893
Len Brown4be44fc2005-08-05 00:44:28 -0400894static int __init acpi_processor_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
Len Brown4be44fc2005-08-05 00:44:28 -0400896 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
Yinghai Luce8442b2009-08-26 14:29:26 -0700898 if (acpi_disabled)
899 return 0;
900
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 memset(&errata, 0, sizeof(errata));
902
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 result = acpi_bus_register_driver(&acpi_processor_driver);
Len Brown4f86d3a2007-10-03 18:58:00 -0400904 if (result < 0)
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530905 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
907 acpi_processor_install_hotplug_notify();
908
909 acpi_thermal_cpufreq_init();
910
911 acpi_processor_ppc_init();
912
Zhao Yakui11805092008-01-28 13:53:42 +0800913 acpi_processor_throttling_init();
914
Patrick Mocheld550d982006-06-27 00:41:40 -0400915 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916}
917
Len Brown4be44fc2005-08-05 00:44:28 -0400918static void __exit acpi_processor_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919{
Yinghai Luce8442b2009-08-26 14:29:26 -0700920 if (acpi_disabled)
921 return;
922
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 acpi_processor_ppc_exit();
924
925 acpi_thermal_cpufreq_exit();
926
927 acpi_processor_uninstall_hotplug_notify();
928
929 acpi_bus_unregister_driver(&acpi_processor_driver);
930
Patrick Mocheld550d982006-06-27 00:41:40 -0400931 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932}
933
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934module_init(acpi_processor_init);
935module_exit(acpi_processor_exit);
936
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937MODULE_ALIAS("processor");