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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>
Toshi Kani47db4542012-11-20 23:42:27 +000047#include <linux/acpi.h>
Wen Congyang76bba142013-02-22 16:33:29 -080048#include <linux/memory_hotplug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <asm/cpu.h>
52#include <asm/delay.h>
53#include <asm/uaccess.h>
54#include <asm/processor.h>
55#include <asm/smp.h>
56#include <asm/acpi.h>
57
58#include <acpi/acpi_bus.h>
59#include <acpi/acpi_drivers.h>
60#include <acpi/processor.h>
61
Len Browna192a952009-07-28 16:45:54 -040062#define PREFIX "ACPI: "
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#define ACPI_PROCESSOR_CLASS "processor"
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
66#define ACPI_PROCESSOR_FILE_INFO "info"
67#define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
68#define ACPI_PROCESSOR_FILE_LIMIT "limit"
69#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
70#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
Luming Yu01854e62007-05-26 22:49:58 +080071#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
Toshi Kani9f324bd2012-03-19 13:08:02 -060072#define ACPI_PROCESSOR_DEVICE_HID "ACPI0007"
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74#define ACPI_PROCESSOR_LIMIT_USER 0
75#define ACPI_PROCESSOR_LIMIT_THERMAL 1
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#define _COMPONENT ACPI_PROCESSOR_COMPONENT
Alex Chiang0131aa32010-02-22 12:11:08 -070078ACPI_MODULE_NAME("processor_driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Len Brownf52fd662007-02-12 22:42:12 -050080MODULE_AUTHOR("Paul Diefenbaugh");
Len Brown7cda93e2007-02-12 23:50:02 -050081MODULE_DESCRIPTION("ACPI Processor Driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070082MODULE_LICENSE("GPL");
83
Len Brown4be44fc2005-08-05 00:44:28 -040084static int acpi_processor_add(struct acpi_device *device);
Rafael J. Wysocki51fac832013-01-24 00:24:48 +010085static int acpi_processor_remove(struct acpi_device *device);
Bjorn Helgaas7ec0a722009-03-30 17:48:24 +000086static void acpi_processor_notify(struct acpi_device *device, u32 event);
Thomas Renninger3bd81a82012-01-17 22:40:07 +010087static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088static int acpi_processor_handle_eject(struct acpi_processor *pr);
Thomas Renninger99b72502012-01-19 18:18:43 +010089static int acpi_processor_start(struct acpi_processor *pr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Thomas Renninger1ba90e32007-07-23 14:44:41 +020091static const struct acpi_device_id processor_device_ids[] = {
Myron Stowead93a762008-11-04 14:52:55 -070092 {ACPI_PROCESSOR_OBJECT_HID, 0},
Toshi Kani9f324bd2012-03-19 13:08:02 -060093 {ACPI_PROCESSOR_DEVICE_HID, 0},
Thomas Renninger1ba90e32007-07-23 14:44:41 +020094 {"", 0},
95};
96MODULE_DEVICE_TABLE(acpi, processor_device_ids);
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098static struct acpi_driver acpi_processor_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050099 .name = "processor",
Len Brown4be44fc2005-08-05 00:44:28 -0400100 .class = ACPI_PROCESSOR_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +0200101 .ids = processor_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -0400102 .ops = {
103 .add = acpi_processor_add,
104 .remove = acpi_processor_remove,
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)) {
Toshi Kani47db4542012-11-20 23:42:27 +0000283 dev_err(&device->dev,
284 "Failed to evaluate processor object (0x%x)\n",
285 status);
Bjorn Helgaas6cc73b42009-04-27 16:33:41 -0600286 return -ENODEV;
287 }
288
289 /*
290 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
291 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
292 * arch/xxx/acpi.c
293 */
294 pr->acpi_id = object.processor.proc_id;
295 } else {
Myron Stoweb26e9282008-11-04 14:53:00 -0700296 /*
297 * Declared with "Device" statement; match _UID.
298 * Note that we don't handle string _UIDs yet.
299 */
Matthew Wilcox27663c52008-10-10 02:22:59 -0400300 unsigned long long value;
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300301 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
302 NULL, &value);
303 if (ACPI_FAILURE(status)) {
Toshi Kani47db4542012-11-20 23:42:27 +0000304 dev_err(&device->dev,
305 "Failed to evaluate processor _UID (0x%x)\n",
306 status);
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300307 return -ENODEV;
308 }
Myron Stoweb26e9282008-11-04 14:53:00 -0700309 device_declaration = 1;
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300310 pr->acpi_id = value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 }
Alex Chiang2e9d5e42010-02-22 12:11:19 -0700312 cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Len Brown4be44fc2005-08-05 00:44:28 -0400314 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
Ashok Rajdf42baa2006-03-28 17:04:00 -0500315 if (!cpu0_initialized && (cpu_index == -1) &&
Len Brown4be44fc2005-08-05 00:44:28 -0400316 (num_online_cpus() == 1)) {
317 cpu_index = 0;
318 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Len Brown4be44fc2005-08-05 00:44:28 -0400320 cpu0_initialized = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Len Brown4be44fc2005-08-05 00:44:28 -0400322 pr->id = cpu_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Len Brown4be44fc2005-08-05 00:44:28 -0400324 /*
325 * Extra Processor objects may be enumerated on MP systems with
326 * less than the max # of CPUs. They should be ignored _iff
327 * they are physically not present.
328 */
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +0300329 if (pr->id == -1) {
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100330 if (ACPI_FAILURE(acpi_processor_hotadd_init(pr)))
Patrick Mocheld550d982006-06-27 00:41:40 -0400331 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400332 }
Zhao Yakui7a04b842009-06-24 11:46:44 +0800333 /*
334 * On some boxes several processors use the same processor bus id.
335 * But they are located in different scope. For example:
336 * \_SB.SCK0.CPU0
337 * \_SB.SCK1.CPU0
338 * Rename the processor device bus id. And the new bus id will be
339 * generated as the following format:
340 * CPU+CPU ID.
341 */
342 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
Len Brown4be44fc2005-08-05 00:44:28 -0400344 pr->acpi_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
346 if (!object.processor.pblk_address)
347 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
348 else if (object.processor.pblk_length != 6)
Toshi Kani47db4542012-11-20 23:42:27 +0000349 dev_err(&device->dev, "Invalid PBLK length [%d]\n",
Len Brown64684632006-06-26 23:41:38 -0400350 object.processor.pblk_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 else {
352 pr->throttling.address = object.processor.pblk_address;
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300353 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
354 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356 pr->pblk = object.processor.pblk_address;
357
358 /*
359 * We don't care about error returns - we just try to mark
360 * these reserved so that nobody else is confused into thinking
361 * that this region might be unused..
362 *
363 * (In particular, allocating the IO range for Cardbus)
364 */
365 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
366 }
367
Alex Chiangfe086a72008-04-29 15:05:29 -0700368 /*
369 * If ACPI describes a slot number for this CPU, we can use it
370 * ensure we get the right value in the "physical id" field
371 * of /proc/cpuinfo
372 */
373 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
374 if (ACPI_SUCCESS(status))
375 arch_fix_phys_package_id(pr->id, object.integer.value);
376
Patrick Mocheld550d982006-06-27 00:41:40 -0400377 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379
Mike Travis706546d2008-06-09 16:22:23 -0700380static DEFINE_PER_CPU(void *, processor_device_array);
Venkatesh Pallipadicd8e2b42005-10-21 19:22:00 -0400381
Bjorn Helgaas7ec0a722009-03-30 17:48:24 +0000382static void acpi_processor_notify(struct acpi_device *device, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
Bjorn Helgaas7ec0a722009-03-30 17:48:24 +0000384 struct acpi_processor *pr = acpi_driver_data(device);
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300385 int saved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
387 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400388 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 switch (event) {
391 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300392 saved = pr->performance_platform_limit;
Zhao Yakuid81c45e12009-10-16 09:20:41 +0800393 acpi_processor_ppc_has_changed(pr, 1);
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300394 if (saved == pr->performance_platform_limit)
395 break;
Len Brown14e04fb2007-08-23 15:20:26 -0400396 acpi_bus_generate_proc_event(device, event,
Len Brown4be44fc2005-08-05 00:44:28 -0400397 pr->performance_platform_limit);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800398 acpi_bus_generate_netlink_event(device->pnp.device_class,
Kay Sievers07944692008-10-30 01:18:59 +0100399 dev_name(&device->dev), event,
Zhang Rui962ce8c2007-08-23 01:24:31 +0800400 pr->performance_platform_limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 break;
402 case ACPI_PROCESSOR_NOTIFY_POWER:
403 acpi_processor_cst_has_changed(pr);
Len Brown14e04fb2007-08-23 15:20:26 -0400404 acpi_bus_generate_proc_event(device, event, 0);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800405 acpi_bus_generate_netlink_event(device->pnp.device_class,
Kay Sievers07944692008-10-30 01:18:59 +0100406 dev_name(&device->dev), event, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 break;
Luming Yu01854e62007-05-26 22:49:58 +0800408 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
409 acpi_processor_tstate_has_changed(pr);
Len Brown14e04fb2007-08-23 15:20:26 -0400410 acpi_bus_generate_proc_event(device, event, 0);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800411 acpi_bus_generate_netlink_event(device->pnp.device_class,
Kay Sievers07944692008-10-30 01:18:59 +0100412 dev_name(&device->dev), event, 0);
Alan Cox879dca02012-10-26 01:05:56 +0200413 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 default:
415 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400416 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 break;
418 }
419
Patrick Mocheld550d982006-06-27 00:41:40 -0400420 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421}
422
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200423static int acpi_cpu_soft_notify(struct notifier_block *nfb,
424 unsigned long action, void *hcpu)
425{
426 unsigned int cpu = (unsigned long)hcpu;
Mike Travis706546d2008-06-09 16:22:23 -0700427 struct acpi_processor *pr = per_cpu(processors, cpu);
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200428
429 if (action == CPU_ONLINE && pr) {
Thomas Renninger99b72502012-01-19 18:18:43 +0100430 /* CPU got physically hotplugged and onlined the first time:
431 * Initialize missing things
432 */
433 if (pr->flags.need_hotplug_init) {
Toshi Kani47db4542012-11-20 23:42:27 +0000434 pr_info("Will online and init hotplugged CPU: %d\n",
435 pr->id);
Thomas Renninger99b72502012-01-19 18:18:43 +0100436 WARN(acpi_processor_start(pr), "Failed to start CPU:"
437 " %d\n", pr->id);
438 pr->flags.need_hotplug_init = 0;
Thomas Renninger99b72502012-01-19 18:18:43 +0100439 /* Normal CPU soft online event */
440 } else {
441 acpi_processor_ppc_has_changed(pr, 0);
Feng Tangb7db60f2012-07-31 12:44:43 +0800442 acpi_processor_hotplug(pr);
Thomas Renninger99b72502012-01-19 18:18:43 +0100443 acpi_processor_reevaluate_tstate(pr, action);
444 acpi_processor_tstate_has_changed(pr);
445 }
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200446 }
Zhao Yakui5a344a52011-01-10 16:35:45 +0800447 if (action == CPU_DEAD && pr) {
448 /* invalidate the flag.throttling after one CPU is offline */
449 acpi_processor_reevaluate_tstate(pr, action);
450 }
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200451 return NOTIFY_OK;
452}
453
454static struct notifier_block acpi_cpu_notifier =
455{
456 .notifier_call = acpi_cpu_soft_notify,
457};
458
Thomas Renninger99b72502012-01-19 18:18:43 +0100459/*
460 * acpi_processor_start() is called by the cpu_hotplug_notifier func:
461 * acpi_cpu_soft_notify(). Getting it __cpuinit{data} is difficult, the
462 * root cause seem to be that acpi_processor_uninstall_hotplug_notify()
463 * is in the module_exit (__exit) func. Allowing acpi_processor_start()
464 * to not be in __cpuinit section, but being called from __cpuinit funcs
465 * via __ref looks like the right thing to do here.
466 */
467static __ref int acpi_processor_start(struct acpi_processor *pr)
Thomas Renninger54d5dcc2012-01-19 18:18:42 +0100468{
469 struct acpi_device *device = per_cpu(processor_device_array, pr->id);
470 int result = 0;
471
472#ifdef CONFIG_CPU_FREQ
473 acpi_processor_ppc_has_changed(pr, 0);
Yinghai Lu976a0be2012-02-07 11:45:57 -0800474 acpi_processor_load_module(pr);
Thomas Renninger54d5dcc2012-01-19 18:18:42 +0100475#endif
476 acpi_processor_get_throttling_info(pr);
477 acpi_processor_get_limit_info(pr);
478
479 if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
Daniel Lezcano38a991b2012-09-15 22:42:54 +0200480 acpi_processor_power_init(pr);
Thomas Renninger54d5dcc2012-01-19 18:18:42 +0100481
482 pr->cdev = thermal_cooling_device_register("Processor", device,
483 &processor_cooling_ops);
484 if (IS_ERR(pr->cdev)) {
485 result = PTR_ERR(pr->cdev);
486 goto err_power_exit;
487 }
488
489 dev_dbg(&device->dev, "registered as cooling_device%d\n",
490 pr->cdev->id);
491
492 result = sysfs_create_link(&device->dev.kobj,
493 &pr->cdev->device.kobj,
494 "thermal_cooling");
495 if (result) {
Toshi Kani47db4542012-11-20 23:42:27 +0000496 dev_err(&device->dev,
497 "Failed to create sysfs link 'thermal_cooling'\n");
Thomas Renninger54d5dcc2012-01-19 18:18:42 +0100498 goto err_thermal_unregister;
499 }
500 result = sysfs_create_link(&pr->cdev->device.kobj,
501 &device->dev.kobj,
502 "device");
503 if (result) {
Toshi Kani47db4542012-11-20 23:42:27 +0000504 dev_err(&pr->cdev->device,
505 "Failed to create sysfs link 'device'\n");
Thomas Renninger54d5dcc2012-01-19 18:18:42 +0100506 goto err_remove_sysfs_thermal;
507 }
508
509 return 0;
510
511err_remove_sysfs_thermal:
512 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
513err_thermal_unregister:
514 thermal_cooling_device_unregister(pr->cdev);
515err_power_exit:
Daniel Lezcano38a991b2012-09-15 22:42:54 +0200516 acpi_processor_power_exit(pr);
Thomas Renninger54d5dcc2012-01-19 18:18:42 +0100517
518 return result;
519}
520
Thomas Renninger99b72502012-01-19 18:18:43 +0100521/*
522 * Do not put anything in here which needs the core to be online.
523 * For example MSR access or setting up things which check for cpuinfo_x86
524 * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
525 * Such things have to be put in and set up above in acpi_processor_start()
526 */
Rakib Mullick941b10f2009-11-05 16:51:40 -0500527static int __cpuinit acpi_processor_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
Len Brown4be44fc2005-08-05 00:44:28 -0400529 struct acpi_processor *pr = NULL;
Bjorn Helgaas970b0492009-06-22 20:41:19 +0000530 int result = 0;
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800531 struct device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
Burman Yan36bcbec2006-12-19 12:56:11 -0800533 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400535 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Yinghai Lueaa95842009-06-06 14:51:36 -0700537 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
Julia Lawallc80f5b32012-03-15 09:32:05 +0100538 result = -ENOMEM;
539 goto err_free_pr;
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800540 }
541
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 pr->handle = device->handle;
543 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
544 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700545 device->driver_data = pr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 result = acpi_processor_get_info(device);
548 if (result) {
549 /* Processor is physically not present */
550 return 0;
551 }
552
Thomas Renninger75cbfb92010-05-26 17:03:33 +0200553#ifdef CONFIG_SMP
554 if (pr->id >= setup_max_cpus && pr->id != 0)
555 return 0;
556#endif
557
Chen Gang9b275162013-02-27 04:27:30 +0000558 BUG_ON(pr->id >= nr_cpu_ids);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
560 /*
561 * Buggy BIOS check
562 * ACPI id of processors can be reported wrongly by the BIOS.
563 * Don't trust it blindly
564 */
565 if (per_cpu(processor_device_array, pr->id) != NULL &&
566 per_cpu(processor_device_array, pr->id) != device) {
Toshi Kani47db4542012-11-20 23:42:27 +0000567 dev_warn(&device->dev,
568 "BIOS reported wrong ACPI id %d for the processor\n",
569 pr->id);
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
Rafael J. Wysocki51fac832013-01-24 00:24:48 +0100610static int acpi_processor_remove(struct acpi_device *device)
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
Rafael J. Wysocki51fac832013-01-24 00:24:48 +0100623 if (device->removal_type == ACPI_BUS_REMOVAL_EJECT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 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
Daniel Lezcano38a991b2012-09-15 22:42:54 +0200628 acpi_processor_power_exit(pr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
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 Ruid9460fd222008-01-17 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;
Wen Congyang76bba142013-02-22 16:33:29 -0800641 try_offline_node(cpu_to_node(pr->id));
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800642
643free:
644 free_cpumask_var(pr->throttling.shared_cpu_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 kfree(pr);
646
Patrick Mocheld550d982006-06-27 00:41:40 -0400647 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648}
649
650#ifdef CONFIG_ACPI_HOTPLUG_CPU
651/****************************************************************************
652 * Acpi processor hotplug support *
653 ****************************************************************************/
654
Len Brown4be44fc2005-08-05 00:44:28 -0400655static int is_processor_present(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656{
Len Brown4be44fc2005-08-05 00:44:28 -0400657 acpi_status status;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400658 unsigned long long sta = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
661 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
Zhang Ruicfaf3742008-01-09 02:17:47 -0500662
663 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
664 return 1;
665
Zhang Ruid0ce46f2008-02-23 01:53:09 -0500666 /*
667 * _STA is mandatory for a processor that supports hot plug
668 */
669 if (status == AE_NOT_FOUND)
670 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
671 "Processor does not support hot plug\n"));
672 else
673 ACPI_EXCEPTION((AE_INFO, status,
674 "Processor Device is not present"));
Zhang Ruicfaf3742008-01-09 02:17:47 -0500675 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676}
677
Jan Beulich6430c9c2011-02-17 16:33:53 +0000678static void acpi_processor_hotplug_notify(acpi_handle handle,
679 u32 event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680{
Len Brown4be44fc2005-08-05 00:44:28 -0400681 struct acpi_device *device = NULL;
Toshi Kanic5b18e22012-11-01 14:42:13 +0000682 struct acpi_eject_event *ej_event = NULL;
Toshi Kani51af3b92012-05-23 20:25:21 -0600683 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100684 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 int result;
686
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100687 acpi_scan_lock_acquire();
688
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 switch (event) {
690 case ACPI_NOTIFY_BUS_CHECK:
691 case ACPI_NOTIFY_DEVICE_CHECK:
Glauber Costad6f882e2008-03-04 15:06:36 -0800692 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
693 "Processor driver received %s event\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400694 (event == ACPI_NOTIFY_BUS_CHECK) ?
Glauber Costad6f882e2008-03-04 15:06:36 -0800695 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
697 if (!is_processor_present(handle))
698 break;
699
Toshi Kani51af3b92012-05-23 20:25:21 -0600700 if (!acpi_bus_get_device(handle, &device))
701 break;
702
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +0100703 result = acpi_bus_scan(handle);
Toshi Kani51af3b92012-05-23 20:25:21 -0600704 if (result) {
Toshi Kani47db4542012-11-20 23:42:27 +0000705 acpi_handle_err(handle, "Unable to add the device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 break;
707 }
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +0100708 result = acpi_bus_get_device(handle, &device);
709 if (result) {
710 acpi_handle_err(handle, "Missing device object\n");
711 break;
712 }
Toshi Kani51af3b92012-05-23 20:25:21 -0600713 ost_code = ACPI_OST_SC_SUCCESS;
Len Brown4be44fc2005-08-05 00:44:28 -0400714 break;
Toshi Kani51af3b92012-05-23 20:25:21 -0600715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 case ACPI_NOTIFY_EJECT_REQUEST:
Len Brown4be44fc2005-08-05 00:44:28 -0400717 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
718 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
720 if (acpi_bus_get_device(handle, &device)) {
Toshi Kani47db4542012-11-20 23:42:27 +0000721 acpi_handle_err(handle,
722 "Device don't exist, dropping EJECT\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 break;
724 }
Toshi Kanic5b18e22012-11-01 14:42:13 +0000725 if (!acpi_driver_data(device)) {
Toshi Kani47db4542012-11-20 23:42:27 +0000726 acpi_handle_err(handle,
727 "Driver data is NULL, dropping EJECT\n");
Toshi Kani51af3b92012-05-23 20:25:21 -0600728 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 }
Toshi Kani51af3b92012-05-23 20:25:21 -0600730
Toshi Kanic5b18e22012-11-01 14:42:13 +0000731 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
732 if (!ej_event) {
Toshi Kani47db4542012-11-20 23:42:27 +0000733 acpi_handle_err(handle, "No memory, dropping EJECT\n");
Toshi Kanic5b18e22012-11-01 14:42:13 +0000734 break;
735 }
736
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100737 get_device(&device->dev);
Yinghai Lu5993c462013-01-11 22:40:41 +0000738 ej_event->device = device;
Toshi Kanic5b18e22012-11-01 14:42:13 +0000739 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100740 /* The eject is carried out asynchronously. */
741 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
742 ej_event);
743 if (ACPI_FAILURE(status)) {
744 put_device(&device->dev);
745 kfree(ej_event);
746 break;
747 }
748 goto out;
Toshi Kani51af3b92012-05-23 20:25:21 -0600749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 default:
751 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400752 "Unsupported event [0x%x]\n", event));
Toshi Kani51af3b92012-05-23 20:25:21 -0600753
754 /* non-hotplug event; possibly handled by other handler */
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100755 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 }
757
Toshi Kani51af3b92012-05-23 20:25:21 -0600758 /* Inform firmware that the hotplug operation has completed */
759 (void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100760
761 out:
762 acpi_scan_lock_release();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763}
764
Toshi Kani9f324bd2012-03-19 13:08:02 -0600765static acpi_status is_processor_device(acpi_handle handle)
766{
767 struct acpi_device_info *info;
768 char *hid;
769 acpi_status status;
770
771 status = acpi_get_object_info(handle, &info);
772 if (ACPI_FAILURE(status))
773 return status;
774
775 if (info->type == ACPI_TYPE_PROCESSOR) {
776 kfree(info);
777 return AE_OK; /* found a processor object */
778 }
779
780 if (!(info->valid & ACPI_VALID_HID)) {
781 kfree(info);
782 return AE_ERROR;
783 }
784
785 hid = info->hardware_id.string;
786 if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) {
787 kfree(info);
788 return AE_ERROR;
789 }
790
791 kfree(info);
792 return AE_OK; /* found a processor device object */
793}
794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795static acpi_status
796processor_walk_namespace_cb(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400797 u32 lvl, void *context, void **rv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798{
Len Brown4be44fc2005-08-05 00:44:28 -0400799 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 int *action = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
Toshi Kani9f324bd2012-03-19 13:08:02 -0600802 status = is_processor_device(handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 if (ACPI_FAILURE(status))
Toshi Kani9f324bd2012-03-19 13:08:02 -0600804 return AE_OK; /* not a processor; continue to walk */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Len Brown4be44fc2005-08-05 00:44:28 -0400806 switch (*action) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 case INSTALL_NOTIFY_HANDLER:
808 acpi_install_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400809 ACPI_SYSTEM_NOTIFY,
810 acpi_processor_hotplug_notify,
811 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 break;
813 case UNINSTALL_NOTIFY_HANDLER:
814 acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400815 ACPI_SYSTEM_NOTIFY,
816 acpi_processor_hotplug_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 break;
818 default:
819 break;
820 }
821
Toshi Kani9f324bd2012-03-19 13:08:02 -0600822 /* found a processor; skip walking underneath */
823 return AE_CTRL_DEPTH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824}
825
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100826static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827{
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100828 acpi_handle handle = pr->handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
830 if (!is_processor_present(handle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400831 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 }
833
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100834 if (acpi_map_lsapic(handle, &pr->id))
Patrick Mocheld550d982006-06-27 00:41:40 -0400835 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100837 if (arch_register_cpu(pr->id)) {
838 acpi_unmap_lsapic(pr->id);
Patrick Mocheld550d982006-06-27 00:41:40 -0400839 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 }
841
Thomas Renninger99b72502012-01-19 18:18:43 +0100842 /* CPU got hot-plugged, but cpu_data is not initialized yet
843 * Set flag to delay cpu_idle/throttling initialization
844 * in:
845 * acpi_processor_add()
846 * acpi_processor_get_info()
847 * and do it when the CPU gets online the first time
848 * TBD: Cleanup above functions and try to do this more elegant.
849 */
Toshi Kani47db4542012-11-20 23:42:27 +0000850 pr_info("CPU %d got hotplugged\n", pr->id);
Thomas Renninger99b72502012-01-19 18:18:43 +0100851 pr->flags.need_hotplug_init = 1;
852
Patrick Mocheld550d982006-06-27 00:41:40 -0400853 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854}
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{
Zhang Ruib62b8ef2008-04-29 02:35:56 -0400858 if (cpu_online(pr->id))
859 cpu_down(pr->id);
860
Yasuaki Ishimatsu5e5041f2012-10-23 01:30:54 +0200861 get_online_cpus();
862 /*
863 * The cpu might become online again at this point. So we check whether
864 * the cpu has been onlined or not. If the cpu became online, it means
865 * that someone wants to use the cpu. So acpi_processor_handle_eject()
866 * returns -EAGAIN.
867 */
868 if (unlikely(cpu_online(pr->id))) {
869 put_online_cpus();
870 pr_warn("Failed to remove CPU %d, because other task "
871 "brought the CPU back online\n", pr->id);
872 return -EAGAIN;
873 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 arch_unregister_cpu(pr->id);
875 acpi_unmap_lsapic(pr->id);
Yasuaki Ishimatsu5e5041f2012-10-23 01:30:54 +0200876 put_online_cpus();
Len Brown4be44fc2005-08-05 00:44:28 -0400877 return (0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878}
879#else
Thomas Renninger3bd81a82012-01-17 22:40:07 +0100880static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881{
882 return AE_ERROR;
883}
Len Brown4be44fc2005-08-05 00:44:28 -0400884static int acpi_processor_handle_eject(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885{
Len Brown4be44fc2005-08-05 00:44:28 -0400886 return (-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887}
888#endif
889
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890static
891void acpi_processor_install_hotplug_notify(void)
892{
893#ifdef CONFIG_ACPI_HOTPLUG_CPU
894 int action = INSTALL_NOTIFY_HANDLER;
Toshi Kani9f324bd2012-03-19 13:08:02 -0600895 acpi_walk_namespace(ACPI_TYPE_ANY,
Len Brown4be44fc2005-08-05 00:44:28 -0400896 ACPI_ROOT_OBJECT,
897 ACPI_UINT32_MAX,
Lin Ming22635762009-11-13 10:06:08 +0800898 processor_walk_namespace_cb, NULL, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899#endif
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200900 register_hotcpu_notifier(&acpi_cpu_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901}
902
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903static
904void acpi_processor_uninstall_hotplug_notify(void)
905{
906#ifdef CONFIG_ACPI_HOTPLUG_CPU
907 int action = UNINSTALL_NOTIFY_HANDLER;
Toshi Kani9f324bd2012-03-19 13:08:02 -0600908 acpi_walk_namespace(ACPI_TYPE_ANY,
Len Brown4be44fc2005-08-05 00:44:28 -0400909 ACPI_ROOT_OBJECT,
910 ACPI_UINT32_MAX,
Lin Ming22635762009-11-13 10:06:08 +0800911 processor_walk_namespace_cb, NULL, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912#endif
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200913 unregister_hotcpu_notifier(&acpi_cpu_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914}
915
916/*
917 * We keep the driver loaded even when ACPI is not running.
918 * This is needed for the powernow-k8 driver, that works even without
919 * ACPI, but needs symbols from this driver
920 */
921
Len Brown4be44fc2005-08-05 00:44:28 -0400922static int __init acpi_processor_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923{
Len Brown4be44fc2005-08-05 00:44:28 -0400924 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925
Yinghai Luce8442b2009-08-26 14:29:26 -0700926 if (acpi_disabled)
927 return 0;
928
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 result = acpi_bus_register_driver(&acpi_processor_driver);
Len Brown4f86d3a2007-10-03 18:58:00 -0400930 if (result < 0)
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530931 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932
Rafael J. Wysocki0a3b15a2013-05-02 21:54:37 +0200933 acpi_processor_syscore_init();
934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 acpi_processor_install_hotplug_notify();
936
937 acpi_thermal_cpufreq_init();
938
939 acpi_processor_ppc_init();
940
Zhao Yakui11805092008-01-28 13:53:42 +0800941 acpi_processor_throttling_init();
942
Patrick Mocheld550d982006-06-27 00:41:40 -0400943 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944}
945
Len Brown4be44fc2005-08-05 00:44:28 -0400946static void __exit acpi_processor_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947{
Yinghai Luce8442b2009-08-26 14:29:26 -0700948 if (acpi_disabled)
949 return;
950
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 acpi_processor_ppc_exit();
952
953 acpi_thermal_cpufreq_exit();
954
955 acpi_processor_uninstall_hotplug_notify();
956
Rafael J. Wysocki0a3b15a2013-05-02 21:54:37 +0200957 acpi_processor_syscore_exit();
958
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 acpi_bus_unregister_driver(&acpi_processor_driver);
960
Patrick Mocheld550d982006-06-27 00:41:40 -0400961 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962}
963
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964module_init(acpi_processor_init);
965module_exit(acpi_processor_exit);
966
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967MODULE_ALIAS("processor");