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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>
43#include <linux/proc_fs.h>
44#include <linux/seq_file.h>
45#include <linux/dmi.h>
46#include <linux/moduleparam.h>
Len Brown4f86d3a2007-10-03 18:58:00 -040047#include <linux/cpuidle.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49#include <asm/io.h>
50#include <asm/system.h>
51#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#define ACPI_PROCESSOR_COMPONENT 0x01000000
63#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
Len Brownf52fd662007-02-12 22:42:12 -050076ACPI_MODULE_NAME("processor_core");
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);
83static int acpi_processor_start(struct acpi_device *device);
84static int acpi_processor_remove(struct acpi_device *device, int type);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
Len Brown4be44fc2005-08-05 00:44:28 -040086static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
88static int acpi_processor_handle_eject(struct acpi_processor *pr);
Luming Yu01854e62007-05-26 22:49:58 +080089extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Thomas Renninger1ba90e32007-07-23 14:44:41 +020092static const struct acpi_device_id processor_device_ids[] = {
93 {ACPI_PROCESSOR_HID, 0},
94 {"", 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,
105 .start = acpi_processor_start,
Thomas Gleixnerb04e7bd2007-09-22 22:29:05 +0000106 .suspend = acpi_processor_suspend,
107 .resume = acpi_processor_resume,
Len Brown4be44fc2005-08-05 00:44:28 -0400108 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109};
110
111#define INSTALL_NOTIFY_HANDLER 1
112#define UNINSTALL_NOTIFY_HANDLER 2
113
Arjan van de Vend7508032006-07-04 13:06:00 -0400114static const struct file_operations acpi_processor_info_fops = {
Len Brown4be44fc2005-08-05 00:44:28 -0400115 .open = acpi_processor_info_open_fs,
116 .read = seq_read,
117 .llseek = seq_lseek,
118 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119};
120
Len Brown4be44fc2005-08-05 00:44:28 -0400121struct acpi_processor *processors[NR_CPUS];
Andreas Mohr9f222712006-06-23 02:04:27 -0700122struct acpi_processor_errata errata __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124/* --------------------------------------------------------------------------
125 Errata Handling
126 -------------------------------------------------------------------------- */
127
Len Brown4be44fc2005-08-05 00:44:28 -0400128static int acpi_processor_errata_piix4(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
Len Brown4be44fc2005-08-05 00:44:28 -0400130 u8 value1 = 0;
131 u8 value2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
134 if (!dev)
Patrick Mocheld550d982006-06-27 00:41:40 -0400135 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 /*
138 * Note that 'dev' references the PIIX4 ACPI Controller.
139 */
140
Auke Kok44c10132007-06-08 15:46:36 -0700141 switch (dev->revision) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 case 0:
143 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
144 break;
145 case 1:
146 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
147 break;
148 case 2:
149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
150 break;
151 case 3:
152 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
153 break;
154 default:
155 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
156 break;
157 }
158
Auke Kok44c10132007-06-08 15:46:36 -0700159 switch (dev->revision) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161 case 0: /* PIIX4 A-step */
162 case 1: /* PIIX4 B-step */
163 /*
164 * See specification changes #13 ("Manual Throttle Duty Cycle")
165 * and #14 ("Enabling and Disabling Manual Throttle"), plus
166 * erratum #5 ("STPCLK# Deassertion Time") from the January
167 * 2002 PIIX4 specification update. Applies to only older
168 * PIIX4 models.
169 */
170 errata.piix4.throttle = 1;
171
172 case 2: /* PIIX4E */
173 case 3: /* PIIX4M */
174 /*
175 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
176 * Livelock") from the January 2002 PIIX4 specification update.
177 * Applies to all PIIX4 models.
178 */
179
180 /*
181 * BM-IDE
182 * ------
183 * Find the PIIX4 IDE Controller and get the Bus Master IDE
184 * Status register address. We'll use this later to read
185 * each IDE controller's DMA status to make sure we catch all
186 * DMA activity.
187 */
188 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
Len Brown4be44fc2005-08-05 00:44:28 -0400189 PCI_DEVICE_ID_INTEL_82371AB,
190 PCI_ANY_ID, PCI_ANY_ID, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (dev) {
192 errata.piix4.bmisx = pci_resource_start(dev, 4);
193 pci_dev_put(dev);
194 }
195
196 /*
197 * Type-F DMA
198 * ----------
199 * Find the PIIX4 ISA Controller and read the Motherboard
200 * DMA controller's status to see if Type-F (Fast) DMA mode
201 * is enabled (bit 7) on either channel. Note that we'll
202 * disable C3 support if this is enabled, as some legacy
203 * devices won't operate well if fast DMA is disabled.
204 */
205 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
Len Brown4be44fc2005-08-05 00:44:28 -0400206 PCI_DEVICE_ID_INTEL_82371AB_0,
207 PCI_ANY_ID, PCI_ANY_ID, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 if (dev) {
209 pci_read_config_byte(dev, 0x76, &value1);
210 pci_read_config_byte(dev, 0x77, &value2);
211 if ((value1 & 0x80) || (value2 & 0x80))
212 errata.piix4.fdma = 1;
213 pci_dev_put(dev);
214 }
215
216 break;
217 }
218
219 if (errata.piix4.bmisx)
220 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400221 "Bus master activity detection (BM-IDE) erratum enabled\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 if (errata.piix4.fdma)
223 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400224 "Type-F DMA livelock erratum (C3 disabled)\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Patrick Mocheld550d982006-06-27 00:41:40 -0400226 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227}
228
Adrian Bunk8713cbe2005-09-02 17:16:48 -0400229static int acpi_processor_errata(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230{
Len Brown4be44fc2005-08-05 00:44:28 -0400231 int result = 0;
232 struct pci_dev *dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400236 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238 /*
239 * PIIX4
240 */
241 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
Len Brown4be44fc2005-08-05 00:44:28 -0400242 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
243 PCI_ANY_ID, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 if (dev) {
245 result = acpi_processor_errata_piix4(dev);
246 pci_dev_put(dev);
247 }
248
Patrick Mocheld550d982006-06-27 00:41:40 -0400249 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250}
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252/* --------------------------------------------------------------------------
Akinobu Mita0b280022006-03-26 01:38:58 -0800253 Common ACPI processor functions
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400254 -------------------------------------------------------------------------- */
255
256/*
257 * _PDC is required for a BIOS-OS handshake for most of the newer
258 * ACPI processor features.
259 */
Venkatesh Pallipadi05131ec2005-10-23 16:31:00 -0400260static int acpi_processor_set_pdc(struct acpi_processor *pr)
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400261{
Venkatesh Pallipadi05131ec2005-10-23 16:31:00 -0400262 struct acpi_object_list *pdc_in = pr->pdc;
Len Brown4be44fc2005-08-05 00:44:28 -0400263 acpi_status status = AE_OK;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400264
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400265
Venkatesh Pallipadi05131ec2005-10-23 16:31:00 -0400266 if (!pdc_in)
Patrick Mocheld550d982006-06-27 00:41:40 -0400267 return status;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400268
Venkatesh Pallipadi05131ec2005-10-23 16:31:00 -0400269 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400270
Venkatesh Pallipadi05131ec2005-10-23 16:31:00 -0400271 if (ACPI_FAILURE(status))
Len Brown4be44fc2005-08-05 00:44:28 -0400272 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Venkatesh Pallipadi05131ec2005-10-23 16:31:00 -0400273 "Could not evaluate _PDC, using legacy perf. control...\n"));
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400274
Patrick Mocheld550d982006-06-27 00:41:40 -0400275 return status;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400276}
277
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400278/* --------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 FS Interface (/proc)
280 -------------------------------------------------------------------------- */
281
Len Brown4be44fc2005-08-05 00:44:28 -0400282static struct proc_dir_entry *acpi_processor_dir = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
284static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
285{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200286 struct acpi_processor *pr = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289 if (!pr)
290 goto end;
291
292 seq_printf(seq, "processor id: %d\n"
Len Brown4be44fc2005-08-05 00:44:28 -0400293 "acpi id: %d\n"
294 "bus mastering control: %s\n"
295 "power management: %s\n"
296 "throttling control: %s\n"
297 "limit interface: %s\n",
298 pr->id,
299 pr->acpi_id,
300 pr->flags.bm_control ? "yes" : "no",
301 pr->flags.power ? "yes" : "no",
302 pr->flags.throttling ? "yes" : "no",
303 pr->flags.limit ? "yes" : "no");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Len Brown4be44fc2005-08-05 00:44:28 -0400305 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400306 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308
309static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
310{
311 return single_open(file, acpi_processor_info_seq_show,
Len Brown4be44fc2005-08-05 00:44:28 -0400312 PDE(inode)->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313}
314
Len Brown4be44fc2005-08-05 00:44:28 -0400315static int acpi_processor_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
Len Brown4be44fc2005-08-05 00:44:28 -0400317 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
320 if (!acpi_device_dir(device)) {
321 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400322 acpi_processor_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400324 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 }
326 acpi_device_dir(device)->owner = THIS_MODULE;
327
328 /* 'info' [R] */
329 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400330 S_IRUGO, acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400332 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 else {
334 entry->proc_fops = &acpi_processor_info_fops;
335 entry->data = acpi_driver_data(device);
336 entry->owner = THIS_MODULE;
337 }
338
339 /* 'throttling' [R/W] */
340 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
Len Brown4be44fc2005-08-05 00:44:28 -0400341 S_IFREG | S_IRUGO | S_IWUSR,
342 acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400344 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 else {
346 entry->proc_fops = &acpi_processor_throttling_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 entry->data = acpi_driver_data(device);
348 entry->owner = THIS_MODULE;
349 }
350
351 /* 'limit' [R/W] */
352 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
Len Brown4be44fc2005-08-05 00:44:28 -0400353 S_IFREG | S_IRUGO | S_IWUSR,
354 acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400356 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 else {
358 entry->proc_fops = &acpi_processor_limit_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 entry->data = acpi_driver_data(device);
360 entry->owner = THIS_MODULE;
361 }
362
Patrick Mocheld550d982006-06-27 00:41:40 -0400363 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364}
365
Len Brown4be44fc2005-08-05 00:44:28 -0400366static int acpi_processor_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369 if (acpi_device_dir(device)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400370 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
371 acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
Len Brown4be44fc2005-08-05 00:44:28 -0400373 acpi_device_dir(device));
374 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
375 acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
377 acpi_device_dir(device) = NULL;
378 }
379
Patrick Mocheld550d982006-06-27 00:41:40 -0400380 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
382
383/* Use the acpiid in MADT to map cpus in case of SMP */
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +0300384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385#ifndef CONFIG_SMP
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300386static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387#else
388
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +0300389static struct acpi_table_madt *madt;
390
391static int map_lapic_id(struct acpi_subtable_header *entry,
392 u32 acpi_id, int *apic_id)
393{
394 struct acpi_madt_local_apic *lapic =
395 (struct acpi_madt_local_apic *)entry;
396 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
397 lapic->processor_id == acpi_id) {
398 *apic_id = lapic->id;
399 return 1;
400 }
401 return 0;
402}
403
404static int map_lsapic_id(struct acpi_subtable_header *entry,
405 u32 acpi_id, int *apic_id)
406{
407 struct acpi_madt_local_sapic *lsapic =
408 (struct acpi_madt_local_sapic *)entry;
409 /* Only check enabled APICs*/
410 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
411 /* First check against id */
412 if (lsapic->processor_id == acpi_id) {
Alexey Starikovskiy615d5f22007-02-12 10:51:23 -0500413 *apic_id = (lsapic->id << 8) | lsapic->eid;
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +0300414 return 1;
415 /* Check against optional uid */
416 } else if (entry->length >= 16 &&
417 lsapic->uid == acpi_id) {
418 *apic_id = lsapic->uid;
419 return 1;
420 }
421 }
422 return 0;
423}
424
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +0300425static int map_madt_entry(u32 acpi_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426{
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +0300427 unsigned long madt_end, entry;
428 int apic_id = -1;
429
430 if (!madt)
431 return apic_id;
432
433 entry = (unsigned long)madt;
434 madt_end = entry + madt->header.length;
435
436 /* Parse all entries looking for a match. */
437
438 entry += sizeof(struct acpi_table_madt);
439 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
440 struct acpi_subtable_header *header =
441 (struct acpi_subtable_header *)entry;
442 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
443 if (map_lapic_id(header, acpi_id, &apic_id))
444 break;
445 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
446 if (map_lsapic_id(header, acpi_id, &apic_id))
447 break;
448 }
449 entry += header->length;
450 }
451 return apic_id;
452}
453
454static int map_mat_entry(acpi_handle handle, u32 acpi_id)
455{
456 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
457 union acpi_object *obj;
458 struct acpi_subtable_header *header;
459 int apic_id = -1;
460
461 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
462 goto exit;
463
464 if (!buffer.length || !buffer.pointer)
465 goto exit;
466
467 obj = buffer.pointer;
468 if (obj->type != ACPI_TYPE_BUFFER ||
469 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
470 goto exit;
471 }
472
473 header = (struct acpi_subtable_header *)obj->buffer.pointer;
474 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
475 map_lapic_id(header, acpi_id, &apic_id);
476 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
477 map_lsapic_id(header, acpi_id, &apic_id);
478 }
479
480exit:
481 if (buffer.pointer)
482 kfree(buffer.pointer);
483 return apic_id;
484}
485
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300486static int get_cpu_id(acpi_handle handle, u32 acpi_id)
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +0300487{
Len Brown4a35a462005-09-03 12:40:06 -0400488 int i;
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +0300489 int apic_id = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +0300491 apic_id = map_mat_entry(handle, acpi_id);
492 if (apic_id == -1)
493 apic_id = map_madt_entry(acpi_id);
494 if (apic_id == -1)
495 return apic_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Christoph Lameterfbb43ab2007-11-28 16:22:08 -0800497 for_each_possible_cpu(i) {
Mike Travis71b31232007-10-19 20:35:03 +0200498 if (cpu_physical_id(i) == apic_id)
Len Brown4a35a462005-09-03 12:40:06 -0400499 return i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 }
501 return -1;
502}
503#endif
504
505/* --------------------------------------------------------------------------
506 Driver Interface
507 -------------------------------------------------------------------------- */
508
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300509static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510{
Len Brown4be44fc2005-08-05 00:44:28 -0400511 acpi_status status = 0;
512 union acpi_object object = { 0 };
513 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
Ashok Rajdf42baa2006-03-28 17:04:00 -0500514 int cpu_index;
Len Brown4be44fc2005-08-05 00:44:28 -0400515 static int cpu0_initialized;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400519 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
521 if (num_online_cpus() > 1)
522 errata.smp = TRUE;
523
524 acpi_processor_errata(pr);
525
526 /*
527 * Check to see if we have bus mastering arbitration control. This
528 * is required for proper C3 usage (to maintain cache coherency).
529 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300530 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 pr->flags.bm_control = 1;
532 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400533 "Bus mastering arbitration control present\n"));
534 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400536 "No bus mastering arbitration control\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300538 /* Check if it is a Device with HID and UID */
539 if (has_uid) {
540 unsigned long value;
541 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
542 NULL, &value);
543 if (ACPI_FAILURE(status)) {
544 printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
545 return -ENODEV;
546 }
547 pr->acpi_id = value;
548 } else {
549 /*
550 * Evalute the processor object. Note that it is common on SMP to
551 * have the first (boot) processor with a valid PBLK address while
552 * all others have a NULL address.
553 */
554 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
555 if (ACPI_FAILURE(status)) {
556 printk(KERN_ERR PREFIX "Evaluating processor object\n");
557 return -ENODEV;
558 }
559
560 /*
561 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
562 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
563 */
564 pr->acpi_id = object.processor.proc_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 }
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300566 cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Len Brown4be44fc2005-08-05 00:44:28 -0400568 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
Ashok Rajdf42baa2006-03-28 17:04:00 -0500569 if (!cpu0_initialized && (cpu_index == -1) &&
Len Brown4be44fc2005-08-05 00:44:28 -0400570 (num_online_cpus() == 1)) {
571 cpu_index = 0;
572 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Len Brown4be44fc2005-08-05 00:44:28 -0400574 cpu0_initialized = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Len Brown4be44fc2005-08-05 00:44:28 -0400576 pr->id = cpu_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
Len Brown4be44fc2005-08-05 00:44:28 -0400578 /*
579 * Extra Processor objects may be enumerated on MP systems with
580 * less than the max # of CPUs. They should be ignored _iff
581 * they are physically not present.
582 */
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +0300583 if (pr->id == -1) {
Len Brown4be44fc2005-08-05 00:44:28 -0400584 if (ACPI_FAILURE
585 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400586 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400587 }
588 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
590 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
Len Brown4be44fc2005-08-05 00:44:28 -0400591 pr->acpi_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
593 if (!object.processor.pblk_address)
594 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
595 else if (object.processor.pblk_length != 6)
Len Brown64684632006-06-26 23:41:38 -0400596 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
597 object.processor.pblk_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 else {
599 pr->throttling.address = object.processor.pblk_address;
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300600 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
601 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
603 pr->pblk = object.processor.pblk_address;
604
605 /*
606 * We don't care about error returns - we just try to mark
607 * these reserved so that nobody else is confused into thinking
608 * that this region might be unused..
609 *
610 * (In particular, allocating the IO range for Cardbus)
611 */
612 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
613 }
614
Patrick Mocheld550d982006-06-27 00:41:40 -0400615 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616}
617
Venkatesh Pallipadicd8e2b42005-10-21 19:22:00 -0400618static void *processor_device_array[NR_CPUS];
619
Pierre Ossman7af8b662006-10-10 14:20:31 -0700620static int __cpuinit acpi_processor_start(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621{
Len Brown4be44fc2005-08-05 00:44:28 -0400622 int result = 0;
623 acpi_status status = AE_OK;
624 struct acpi_processor *pr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
627 pr = acpi_driver_data(device);
628
Alexey Starikovskiy11bf04c2007-02-02 19:48:23 +0300629 result = acpi_processor_get_info(pr, device->flags.unique_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 if (result) {
631 /* Processor is physically not present */
Patrick Mocheld550d982006-06-27 00:41:40 -0400632 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 }
634
Christoph Lameterfbb43ab2007-11-28 16:22:08 -0800635 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
Venkatesh Pallipadicd8e2b42005-10-21 19:22:00 -0400637 /*
638 * Buggy BIOS check
639 * ACPI id of processors can be reported wrongly by the BIOS.
640 * Don't trust it blindly
641 */
642 if (processor_device_array[pr->id] != NULL &&
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200643 processor_device_array[pr->id] != device) {
Joe Perches4fdb2a02007-11-19 17:48:02 -0800644 printk(KERN_WARNING "BIOS reported wrong ACPI id "
Len Brown0eacee52006-03-31 00:37:23 -0500645 "for the processor\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400646 return -ENODEV;
Venkatesh Pallipadicd8e2b42005-10-21 19:22:00 -0400647 }
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200648 processor_device_array[pr->id] = device;
Venkatesh Pallipadicd8e2b42005-10-21 19:22:00 -0400649
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 processors[pr->id] = pr;
651
652 result = acpi_processor_add_fs(device);
653 if (result)
654 goto end;
655
656 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
Len Brown4be44fc2005-08-05 00:44:28 -0400657 acpi_processor_notify, pr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
Venkatesh Pallipadi05131ec2005-10-23 16:31:00 -0400659 /* _PDC call should be done before doing anything else (if reqd.). */
660 arch_acpi_processor_init_pdc(pr);
661 acpi_processor_set_pdc(pr);
Zhao Yakui0ac3c572007-11-15 17:05:46 +0800662#ifdef CONFIG_CPU_FREQ
663 acpi_processor_ppc_has_changed(pr);
664#endif
665 acpi_processor_get_throttling_info(pr);
666 acpi_processor_get_limit_info(pr);
667
Venkatesh Pallipadi05131ec2005-10-23 16:31:00 -0400668
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 acpi_processor_power_init(pr, device);
670
671 if (pr->flags.throttling) {
672 printk(KERN_INFO PREFIX "%s [%s] (supports",
Len Brown4be44fc2005-08-05 00:44:28 -0400673 acpi_device_name(device), acpi_device_bid(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 printk(" %d throttling states", pr->throttling.state_count);
675 printk(")\n");
676 }
677
Len Brown4be44fc2005-08-05 00:44:28 -0400678 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
Patrick Mocheld550d982006-06-27 00:41:40 -0400680 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681}
682
Len Brown4be44fc2005-08-05 00:44:28 -0400683static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200685 struct acpi_processor *pr = data;
Len Brown4be44fc2005-08-05 00:44:28 -0400686 struct acpi_device *device = NULL;
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300687 int saved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
689 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400690 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
692 if (acpi_bus_get_device(pr->handle, &device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400693 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
695 switch (event) {
696 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300697 saved = pr->performance_platform_limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 acpi_processor_ppc_has_changed(pr);
Alexey Starikovskiye790cc82007-11-21 03:23:32 +0300699 if (saved == pr->performance_platform_limit)
700 break;
Len Brown14e04fb32007-08-23 15:20:26 -0400701 acpi_bus_generate_proc_event(device, event,
Len Brown4be44fc2005-08-05 00:44:28 -0400702 pr->performance_platform_limit);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800703 acpi_bus_generate_netlink_event(device->pnp.device_class,
704 device->dev.bus_id, event,
705 pr->performance_platform_limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 break;
707 case ACPI_PROCESSOR_NOTIFY_POWER:
708 acpi_processor_cst_has_changed(pr);
Len Brown14e04fb32007-08-23 15:20:26 -0400709 acpi_bus_generate_proc_event(device, event, 0);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800710 acpi_bus_generate_netlink_event(device->pnp.device_class,
711 device->dev.bus_id, event, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 break;
Luming Yu01854e62007-05-26 22:49:58 +0800713 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
714 acpi_processor_tstate_has_changed(pr);
Len Brown14e04fb32007-08-23 15:20:26 -0400715 acpi_bus_generate_proc_event(device, event, 0);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800716 acpi_bus_generate_netlink_event(device->pnp.device_class,
717 device->dev.bus_id, event, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 default:
719 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400720 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 break;
722 }
723
Patrick Mocheld550d982006-06-27 00:41:40 -0400724 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725}
726
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +0200727static int acpi_cpu_soft_notify(struct notifier_block *nfb,
728 unsigned long action, void *hcpu)
729{
730 unsigned int cpu = (unsigned long)hcpu;
731 struct acpi_processor *pr = processors[cpu];
732
733 if (action == CPU_ONLINE && pr) {
734 acpi_processor_ppc_has_changed(pr);
735 acpi_processor_cst_has_changed(pr);
736 acpi_processor_tstate_has_changed(pr);
737 }
738 return NOTIFY_OK;
739}
740
741static struct notifier_block acpi_cpu_notifier =
742{
743 .notifier_call = acpi_cpu_soft_notify,
744};
745
Len Brown4be44fc2005-08-05 00:44:28 -0400746static int acpi_processor_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
Len Brown4be44fc2005-08-05 00:44:28 -0400748 struct acpi_processor *pr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750
751 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400752 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
Burman Yan36bcbec2006-12-19 12:56:11 -0800754 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400756 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
758 pr->handle = device->handle;
759 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
760 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
761 acpi_driver_data(device) = pr;
762
Patrick Mocheld550d982006-06-27 00:41:40 -0400763 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764}
765
Len Brown4be44fc2005-08-05 00:44:28 -0400766static int acpi_processor_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
Len Brown4be44fc2005-08-05 00:44:28 -0400768 acpi_status status = AE_OK;
769 struct acpi_processor *pr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
772 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400773 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200775 pr = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
Christoph Lameterfbb43ab2007-11-28 16:22:08 -0800777 if (pr->id >= nr_cpu_ids) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 kfree(pr);
Patrick Mocheld550d982006-06-27 00:41:40 -0400779 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 }
781
782 if (type == ACPI_BUS_REMOVAL_EJECT) {
783 if (acpi_processor_handle_eject(pr))
Patrick Mocheld550d982006-06-27 00:41:40 -0400784 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 }
786
787 acpi_processor_power_exit(pr, device);
788
789 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
Len Brown4be44fc2005-08-05 00:44:28 -0400790 acpi_processor_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791
792 acpi_processor_remove_fs(device);
793
794 processors[pr->id] = NULL;
795
796 kfree(pr);
797
Patrick Mocheld550d982006-06-27 00:41:40 -0400798 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799}
800
801#ifdef CONFIG_ACPI_HOTPLUG_CPU
802/****************************************************************************
803 * Acpi processor hotplug support *
804 ****************************************************************************/
805
806static int is_processor_present(acpi_handle handle);
807
Len Brown4be44fc2005-08-05 00:44:28 -0400808static int is_processor_present(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809{
Len Brown4be44fc2005-08-05 00:44:28 -0400810 acpi_status status;
811 unsigned long sta = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
Bjorn Helgaasa0bd4ac2007-04-25 14:17:39 -0400815 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400816 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400817 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400819 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820}
821
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822static
Len Brown4be44fc2005-08-05 00:44:28 -0400823int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824{
Len Brown4be44fc2005-08-05 00:44:28 -0400825 acpi_handle phandle;
826 struct acpi_device *pdev;
827 struct acpi_processor *pr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
830 if (acpi_get_parent(handle, &phandle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400831 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 }
833
834 if (acpi_bus_get_device(phandle, &pdev)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400835 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 }
837
838 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400839 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 }
841
Rajesh Shah3fb02732005-04-28 00:25:52 -0700842 acpi_bus_start(*device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
844 pr = acpi_driver_data(*device);
845 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400846 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
Christoph Lameterfbb43ab2007-11-28 16:22:08 -0800848 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800849 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400851 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852}
853
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854static void
Len Brown4be44fc2005-08-05 00:44:28 -0400855acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856{
Len Brown4be44fc2005-08-05 00:44:28 -0400857 struct acpi_processor *pr;
858 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 int result;
860
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
862 switch (event) {
863 case ACPI_NOTIFY_BUS_CHECK:
864 case ACPI_NOTIFY_DEVICE_CHECK:
865 printk("Processor driver received %s event\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400866 (event == ACPI_NOTIFY_BUS_CHECK) ?
867 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
869 if (!is_processor_present(handle))
870 break;
871
872 if (acpi_bus_get_device(handle, &device)) {
873 result = acpi_processor_device_add(handle, &device);
874 if (result)
Len Brown64684632006-06-26 23:41:38 -0400875 printk(KERN_ERR PREFIX
876 "Unable to add the device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 break;
878 }
879
880 pr = acpi_driver_data(device);
881 if (!pr) {
Len Brown64684632006-06-26 23:41:38 -0400882 printk(KERN_ERR PREFIX "Driver data is NULL\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 break;
884 }
885
Christoph Lameterfbb43ab2007-11-28 16:22:08 -0800886 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800887 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 break;
889 }
890
891 result = acpi_processor_start(device);
Christoph Lameterfbb43ab2007-11-28 16:22:08 -0800892 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800893 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 } else {
Len Brown64684632006-06-26 23:41:38 -0400895 printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
896 acpi_device_bid(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 }
Len Brown4be44fc2005-08-05 00:44:28 -0400898 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 case ACPI_NOTIFY_EJECT_REQUEST:
Len Brown4be44fc2005-08-05 00:44:28 -0400900 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
901 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
903 if (acpi_bus_get_device(handle, &device)) {
Len Brown64684632006-06-26 23:41:38 -0400904 printk(KERN_ERR PREFIX
905 "Device don't exist, dropping EJECT\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 break;
907 }
908 pr = acpi_driver_data(device);
909 if (!pr) {
Len Brown64684632006-06-26 23:41:38 -0400910 printk(KERN_ERR PREFIX
911 "Driver data is NULL, dropping EJECT\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400912 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 }
914
Christoph Lameterfbb43ab2007-11-28 16:22:08 -0800915 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800916 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 break;
918 default:
919 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400920 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 break;
922 }
923
Patrick Mocheld550d982006-06-27 00:41:40 -0400924 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925}
926
927static acpi_status
928processor_walk_namespace_cb(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400929 u32 lvl, void *context, void **rv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930{
Len Brown4be44fc2005-08-05 00:44:28 -0400931 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 int *action = context;
Len Brown4be44fc2005-08-05 00:44:28 -0400933 acpi_object_type type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
935 status = acpi_get_type(handle, &type);
936 if (ACPI_FAILURE(status))
Len Brown4be44fc2005-08-05 00:44:28 -0400937 return (AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938
939 if (type != ACPI_TYPE_PROCESSOR)
Len Brown4be44fc2005-08-05 00:44:28 -0400940 return (AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
Len Brown4be44fc2005-08-05 00:44:28 -0400942 switch (*action) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 case INSTALL_NOTIFY_HANDLER:
944 acpi_install_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400945 ACPI_SYSTEM_NOTIFY,
946 acpi_processor_hotplug_notify,
947 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 break;
949 case UNINSTALL_NOTIFY_HANDLER:
950 acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400951 ACPI_SYSTEM_NOTIFY,
952 acpi_processor_hotplug_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 break;
954 default:
955 break;
956 }
957
Len Brown4be44fc2005-08-05 00:44:28 -0400958 return (AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959}
960
Len Brown4be44fc2005-08-05 00:44:28 -0400961static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963
964 if (!is_processor_present(handle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400965 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 }
967
968 if (acpi_map_lsapic(handle, p_cpu))
Patrick Mocheld550d982006-06-27 00:41:40 -0400969 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
971 if (arch_register_cpu(*p_cpu)) {
972 acpi_unmap_lsapic(*p_cpu);
Patrick Mocheld550d982006-06-27 00:41:40 -0400973 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 }
975
Patrick Mocheld550d982006-06-27 00:41:40 -0400976 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977}
978
Len Brown4be44fc2005-08-05 00:44:28 -0400979static int acpi_processor_handle_eject(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980{
981 if (cpu_online(pr->id)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400982 return (-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 }
984 arch_unregister_cpu(pr->id);
985 acpi_unmap_lsapic(pr->id);
Len Brown4be44fc2005-08-05 00:44:28 -0400986 return (0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987}
988#else
Len Brown4be44fc2005-08-05 00:44:28 -0400989static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990{
991 return AE_ERROR;
992}
Len Brown4be44fc2005-08-05 00:44:28 -0400993static int acpi_processor_handle_eject(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994{
Len Brown4be44fc2005-08-05 00:44:28 -0400995 return (-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996}
997#endif
998
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999static
1000void acpi_processor_install_hotplug_notify(void)
1001{
1002#ifdef CONFIG_ACPI_HOTPLUG_CPU
1003 int action = INSTALL_NOTIFY_HANDLER;
1004 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
Len Brown4be44fc2005-08-05 00:44:28 -04001005 ACPI_ROOT_OBJECT,
1006 ACPI_UINT32_MAX,
1007 processor_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008#endif
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +02001009 register_hotcpu_notifier(&acpi_cpu_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010}
1011
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012static
1013void acpi_processor_uninstall_hotplug_notify(void)
1014{
1015#ifdef CONFIG_ACPI_HOTPLUG_CPU
1016 int action = UNINSTALL_NOTIFY_HANDLER;
1017 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
Len Brown4be44fc2005-08-05 00:44:28 -04001018 ACPI_ROOT_OBJECT,
1019 ACPI_UINT32_MAX,
1020 processor_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021#endif
Venkatesh Pallipadi729c6ba2007-09-16 15:36:43 +02001022 unregister_hotcpu_notifier(&acpi_cpu_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023}
1024
1025/*
1026 * We keep the driver loaded even when ACPI is not running.
1027 * This is needed for the powernow-k8 driver, that works even without
1028 * ACPI, but needs symbols from this driver
1029 */
1030
Len Brown4be44fc2005-08-05 00:44:28 -04001031static int __init acpi_processor_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032{
Len Brown4be44fc2005-08-05 00:44:28 -04001033 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035
1036 memset(&processors, 0, sizeof(processors));
1037 memset(&errata, 0, sizeof(errata));
1038
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +03001039#ifdef CONFIG_SMP
1040 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1041 (struct acpi_table_header **)&madt)))
Randy Dunlap70c08462007-02-13 16:11:36 -08001042 madt = NULL;
Alexey Starikovskiyf18c5a02007-02-02 19:48:23 +03001043#endif
1044
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1046 if (!acpi_processor_dir)
Akinobu Mita83822fc2006-12-19 12:56:10 -08001047 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 acpi_processor_dir->owner = THIS_MODULE;
1049
Len Brown4f86d3a2007-10-03 18:58:00 -04001050 result = cpuidle_register_driver(&acpi_idle_driver);
1051 if (result < 0)
1052 goto out_proc;
1053
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 result = acpi_bus_register_driver(&acpi_processor_driver);
Len Brown4f86d3a2007-10-03 18:58:00 -04001055 if (result < 0)
1056 goto out_cpuidle;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057
1058 acpi_processor_install_hotplug_notify();
1059
1060 acpi_thermal_cpufreq_init();
1061
1062 acpi_processor_ppc_init();
1063
Patrick Mocheld550d982006-06-27 00:41:40 -04001064 return 0;
Len Brown4f86d3a2007-10-03 18:58:00 -04001065
1066out_cpuidle:
1067 cpuidle_unregister_driver(&acpi_idle_driver);
1068
1069out_proc:
1070 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1071
1072 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073}
1074
Len Brown4be44fc2005-08-05 00:44:28 -04001075static void __exit acpi_processor_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 acpi_processor_ppc_exit();
1078
1079 acpi_thermal_cpufreq_exit();
1080
1081 acpi_processor_uninstall_hotplug_notify();
1082
1083 acpi_bus_unregister_driver(&acpi_processor_driver);
1084
Len Brown4f86d3a2007-10-03 18:58:00 -04001085 cpuidle_unregister_driver(&acpi_idle_driver);
1086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1088
Patrick Mocheld550d982006-06-27 00:41:40 -04001089 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090}
1091
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092module_init(acpi_processor_init);
1093module_exit(acpi_processor_exit);
1094
1095EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1096
1097MODULE_ALIAS("processor");