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1da177e4 | 1 | /* |
ac212b69 | 2 | * processor_driver.c - ACPI Processor Driver |
1da177e4 LT |
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 | |
ac212b69 RW |
9 | * Copyright (C) 2013, Intel Corporation |
10 | * Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
1da177e4 LT |
11 | * |
12 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or (at | |
17 | * your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, but | |
20 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
22 | * General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License along | |
25 | * with this program; if not, write to the Free Software Foundation, Inc., | |
26 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
27 | * | |
28 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
1da177e4 LT |
29 | */ |
30 | ||
31 | #include <linux/kernel.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/init.h> | |
1da177e4 LT |
34 | #include <linux/cpufreq.h> |
35 | #include <linux/cpu.h> | |
4f86d3a8 | 36 | #include <linux/cpuidle.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
47db4547 | 38 | #include <linux/acpi.h> |
ac212b69 | 39 | |
1da177e4 LT |
40 | #include <acpi/processor.h> |
41 | ||
ac212b69 RW |
42 | #include "internal.h" |
43 | ||
a192a958 LB |
44 | #define PREFIX "ACPI: " |
45 | ||
1da177e4 LT |
46 | #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
47 | #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 | |
01854e69 | 48 | #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 |
1da177e4 | 49 | |
1da177e4 | 50 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
0131aa3d | 51 | ACPI_MODULE_NAME("processor_driver"); |
1da177e4 | 52 | |
f52fd66d | 53 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 54 | MODULE_DESCRIPTION("ACPI Processor Driver"); |
1da177e4 LT |
55 | MODULE_LICENSE("GPL"); |
56 | ||
ac212b69 RW |
57 | static int acpi_processor_start(struct device *dev); |
58 | static int acpi_processor_stop(struct device *dev); | |
1da177e4 | 59 | |
1ba90e3a | 60 | static const struct acpi_device_id processor_device_ids[] = { |
ad93a765 | 61 | {ACPI_PROCESSOR_OBJECT_HID, 0}, |
9f324bda | 62 | {ACPI_PROCESSOR_DEVICE_HID, 0}, |
1ba90e3a TR |
63 | {"", 0}, |
64 | }; | |
65 | MODULE_DEVICE_TABLE(acpi, processor_device_ids); | |
66 | ||
ac212b69 | 67 | static struct device_driver acpi_processor_driver = { |
c2b6705b | 68 | .name = "processor", |
ac212b69 RW |
69 | .bus = &cpu_subsys, |
70 | .acpi_match_table = processor_device_ids, | |
71 | .probe = acpi_processor_start, | |
72 | .remove = acpi_processor_stop, | |
1da177e4 LT |
73 | }; |
74 | ||
ac212b69 | 75 | static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 76 | { |
ac212b69 | 77 | struct acpi_device *device = data; |
b26e9286 | 78 | struct acpi_processor *pr; |
e790cc8b | 79 | int saved; |
1da177e4 | 80 | |
ac212b69 RW |
81 | if (device->handle != handle) |
82 | return; | |
83 | ||
84 | pr = acpi_driver_data(device); | |
1da177e4 | 85 | if (!pr) |
d550d98d | 86 | return; |
1da177e4 | 87 | |
1da177e4 LT |
88 | switch (event) { |
89 | case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: | |
e790cc8b | 90 | saved = pr->performance_platform_limit; |
d81c45e1 | 91 | acpi_processor_ppc_has_changed(pr, 1); |
e790cc8b AS |
92 | if (saved == pr->performance_platform_limit) |
93 | break; | |
962ce8ca | 94 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
0794469d | 95 | dev_name(&device->dev), event, |
962ce8ca | 96 | pr->performance_platform_limit); |
1da177e4 LT |
97 | break; |
98 | case ACPI_PROCESSOR_NOTIFY_POWER: | |
99 | acpi_processor_cst_has_changed(pr); | |
962ce8ca | 100 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
0794469d | 101 | dev_name(&device->dev), event, 0); |
1da177e4 | 102 | break; |
01854e69 LY |
103 | case ACPI_PROCESSOR_NOTIFY_THROTTLING: |
104 | acpi_processor_tstate_has_changed(pr); | |
962ce8ca | 105 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
0794469d | 106 | dev_name(&device->dev), event, 0); |
879dca01 | 107 | break; |
1da177e4 LT |
108 | default: |
109 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 110 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
111 | break; |
112 | } | |
113 | ||
d550d98d | 114 | return; |
1da177e4 LT |
115 | } |
116 | ||
fe7bf106 | 117 | static int __acpi_processor_start(struct acpi_device *device); |
ac212b69 | 118 | |
fe7bf106 | 119 | static int acpi_cpu_soft_notify(struct notifier_block *nfb, |
ac212b69 | 120 | unsigned long action, void *hcpu) |
729c6ba3 VP |
121 | { |
122 | unsigned int cpu = (unsigned long)hcpu; | |
706546d0 | 123 | struct acpi_processor *pr = per_cpu(processors, cpu); |
ac212b69 | 124 | struct acpi_device *device; |
729c6ba3 | 125 | |
ac212b69 RW |
126 | if (!pr || acpi_bus_get_device(pr->handle, &device)) |
127 | return NOTIFY_DONE; | |
128 | ||
129 | if (action == CPU_ONLINE) { | |
130 | /* | |
131 | * CPU got physically hotplugged and onlined for the first time: | |
132 | * Initialize missing things. | |
99b72508 TR |
133 | */ |
134 | if (pr->flags.need_hotplug_init) { | |
ac212b69 RW |
135 | int ret; |
136 | ||
47db4547 TK |
137 | pr_info("Will online and init hotplugged CPU: %d\n", |
138 | pr->id); | |
99b72508 | 139 | pr->flags.need_hotplug_init = 0; |
ac212b69 RW |
140 | ret = __acpi_processor_start(device); |
141 | WARN(ret, "Failed to start CPU: %d\n", pr->id); | |
99b72508 | 142 | } else { |
ac212b69 | 143 | /* Normal CPU soft online event. */ |
99b72508 | 144 | acpi_processor_ppc_has_changed(pr, 0); |
b7db60f4 | 145 | acpi_processor_hotplug(pr); |
99b72508 TR |
146 | acpi_processor_reevaluate_tstate(pr, action); |
147 | acpi_processor_tstate_has_changed(pr); | |
148 | } | |
ac212b69 RW |
149 | } else if (action == CPU_DEAD) { |
150 | /* Invalidate flag.throttling after the CPU is offline. */ | |
5a344a50 ZY |
151 | acpi_processor_reevaluate_tstate(pr, action); |
152 | } | |
729c6ba3 VP |
153 | return NOTIFY_OK; |
154 | } | |
155 | ||
764d0221 | 156 | static struct notifier_block __refdata acpi_cpu_notifier = { |
729c6ba3 VP |
157 | .notifier_call = acpi_cpu_soft_notify, |
158 | }; | |
159 | ||
fe7bf106 | 160 | static int __acpi_processor_start(struct acpi_device *device) |
54d5dcc4 | 161 | { |
ac212b69 RW |
162 | struct acpi_processor *pr = acpi_driver_data(device); |
163 | acpi_status status; | |
54d5dcc4 TR |
164 | int result = 0; |
165 | ||
ac212b69 RW |
166 | if (!pr) |
167 | return -ENODEV; | |
168 | ||
169 | if (pr->flags.need_hotplug_init) | |
170 | return 0; | |
171 | ||
54d5dcc4 TR |
172 | #ifdef CONFIG_CPU_FREQ |
173 | acpi_processor_ppc_has_changed(pr, 0); | |
174 | #endif | |
175 | acpi_processor_get_throttling_info(pr); | |
22e7551e LT |
176 | |
177 | if (pr->flags.throttling) | |
178 | pr->flags.limit = 1; | |
54d5dcc4 TR |
179 | |
180 | if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver) | |
38a991b6 | 181 | acpi_processor_power_init(pr); |
54d5dcc4 TR |
182 | |
183 | pr->cdev = thermal_cooling_device_register("Processor", device, | |
184 | &processor_cooling_ops); | |
185 | if (IS_ERR(pr->cdev)) { | |
186 | result = PTR_ERR(pr->cdev); | |
187 | goto err_power_exit; | |
188 | } | |
189 | ||
190 | dev_dbg(&device->dev, "registered as cooling_device%d\n", | |
191 | pr->cdev->id); | |
192 | ||
193 | result = sysfs_create_link(&device->dev.kobj, | |
194 | &pr->cdev->device.kobj, | |
195 | "thermal_cooling"); | |
196 | if (result) { | |
47db4547 TK |
197 | dev_err(&device->dev, |
198 | "Failed to create sysfs link 'thermal_cooling'\n"); | |
54d5dcc4 TR |
199 | goto err_thermal_unregister; |
200 | } | |
201 | result = sysfs_create_link(&pr->cdev->device.kobj, | |
202 | &device->dev.kobj, | |
203 | "device"); | |
204 | if (result) { | |
47db4547 TK |
205 | dev_err(&pr->cdev->device, |
206 | "Failed to create sysfs link 'device'\n"); | |
54d5dcc4 TR |
207 | goto err_remove_sysfs_thermal; |
208 | } | |
209 | ||
ac212b69 RW |
210 | status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, |
211 | acpi_processor_notify, device); | |
212 | if (ACPI_SUCCESS(status)) | |
213 | return 0; | |
54d5dcc4 | 214 | |
ac212b69 RW |
215 | sysfs_remove_link(&pr->cdev->device.kobj, "device"); |
216 | err_remove_sysfs_thermal: | |
54d5dcc4 | 217 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
ac212b69 | 218 | err_thermal_unregister: |
54d5dcc4 | 219 | thermal_cooling_device_unregister(pr->cdev); |
ac212b69 | 220 | err_power_exit: |
38a991b6 | 221 | acpi_processor_power_exit(pr); |
54d5dcc4 TR |
222 | return result; |
223 | } | |
224 | ||
fe7bf106 | 225 | static int acpi_processor_start(struct device *dev) |
1da177e4 | 226 | { |
d0a7edbb | 227 | struct acpi_device *device = ACPI_COMPANION(dev); |
1da177e4 | 228 | |
d0a7edbb | 229 | if (!device) |
ac212b69 | 230 | return -ENODEV; |
1da177e4 | 231 | |
ac212b69 | 232 | return __acpi_processor_start(device); |
1da177e4 LT |
233 | } |
234 | ||
ac212b69 | 235 | static int acpi_processor_stop(struct device *dev) |
1da177e4 | 236 | { |
d0a7edbb | 237 | struct acpi_device *device = ACPI_COMPANION(dev); |
ac212b69 | 238 | struct acpi_processor *pr; |
1da177e4 | 239 | |
d0a7edbb | 240 | if (!device) |
ac212b69 | 241 | return 0; |
1da177e4 | 242 | |
ac212b69 RW |
243 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, |
244 | acpi_processor_notify); | |
1da177e4 | 245 | |
50dd0969 | 246 | pr = acpi_driver_data(device); |
ac212b69 RW |
247 | if (!pr) |
248 | return 0; | |
1da177e4 | 249 | |
38a991b6 | 250 | acpi_processor_power_exit(pr); |
1da177e4 | 251 | |
f28bb45e ZY |
252 | if (pr->cdev) { |
253 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); | |
254 | sysfs_remove_link(&pr->cdev->device.kobj, "device"); | |
255 | thermal_cooling_device_unregister(pr->cdev); | |
256 | pr->cdev = NULL; | |
257 | } | |
d550d98d | 258 | return 0; |
1da177e4 LT |
259 | } |
260 | ||
1da177e4 LT |
261 | /* |
262 | * We keep the driver loaded even when ACPI is not running. | |
263 | * This is needed for the powernow-k8 driver, that works even without | |
264 | * ACPI, but needs symbols from this driver | |
265 | */ | |
266 | ||
ac212b69 | 267 | static int __init acpi_processor_driver_init(void) |
1da177e4 | 268 | { |
4be44fcd | 269 | int result = 0; |
1da177e4 | 270 | |
ce8442b5 YL |
271 | if (acpi_disabled) |
272 | return 0; | |
273 | ||
ac212b69 | 274 | result = driver_register(&acpi_processor_driver); |
4f86d3a8 | 275 | if (result < 0) |
46bcfad7 | 276 | return result; |
1da177e4 | 277 | |
0a3b15ac | 278 | acpi_processor_syscore_init(); |
ac212b69 | 279 | register_hotcpu_notifier(&acpi_cpu_notifier); |
1da177e4 | 280 | acpi_thermal_cpufreq_init(); |
1da177e4 | 281 | acpi_processor_ppc_init(); |
1180509f | 282 | acpi_processor_throttling_init(); |
d550d98d | 283 | return 0; |
1da177e4 LT |
284 | } |
285 | ||
ac212b69 | 286 | static void __exit acpi_processor_driver_exit(void) |
1da177e4 | 287 | { |
ce8442b5 YL |
288 | if (acpi_disabled) |
289 | return; | |
290 | ||
1da177e4 | 291 | acpi_processor_ppc_exit(); |
1da177e4 | 292 | acpi_thermal_cpufreq_exit(); |
ac212b69 | 293 | unregister_hotcpu_notifier(&acpi_cpu_notifier); |
0a3b15ac | 294 | acpi_processor_syscore_exit(); |
ac212b69 | 295 | driver_unregister(&acpi_processor_driver); |
1da177e4 LT |
296 | } |
297 | ||
ac212b69 RW |
298 | module_init(acpi_processor_driver_init); |
299 | module_exit(acpi_processor_driver_exit); | |
1da177e4 | 300 | |
1da177e4 | 301 | MODULE_ALIAS("processor"); |