Commit | Line | Data |
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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 | * | |
1da177e4 | 24 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
1da177e4 LT |
25 | */ |
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/init.h> | |
1da177e4 LT |
30 | #include <linux/cpufreq.h> |
31 | #include <linux/cpu.h> | |
4f86d3a8 | 32 | #include <linux/cpuidle.h> |
5a0e3ad6 | 33 | #include <linux/slab.h> |
47db4547 | 34 | #include <linux/acpi.h> |
ac212b69 | 35 | |
1da177e4 LT |
36 | #include <acpi/processor.h> |
37 | ||
ac212b69 RW |
38 | #include "internal.h" |
39 | ||
1da177e4 LT |
40 | #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
41 | #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 | |
01854e69 | 42 | #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 |
1da177e4 | 43 | |
1da177e4 | 44 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
0131aa3d | 45 | ACPI_MODULE_NAME("processor_driver"); |
1da177e4 | 46 | |
f52fd66d | 47 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 48 | MODULE_DESCRIPTION("ACPI Processor Driver"); |
1da177e4 LT |
49 | MODULE_LICENSE("GPL"); |
50 | ||
ac212b69 RW |
51 | static int acpi_processor_start(struct device *dev); |
52 | static int acpi_processor_stop(struct device *dev); | |
1da177e4 | 53 | |
1ba90e3a | 54 | static const struct acpi_device_id processor_device_ids[] = { |
ad93a765 | 55 | {ACPI_PROCESSOR_OBJECT_HID, 0}, |
9f324bda | 56 | {ACPI_PROCESSOR_DEVICE_HID, 0}, |
1ba90e3a TR |
57 | {"", 0}, |
58 | }; | |
59 | MODULE_DEVICE_TABLE(acpi, processor_device_ids); | |
60 | ||
ac212b69 | 61 | static struct device_driver acpi_processor_driver = { |
c2b6705b | 62 | .name = "processor", |
ac212b69 RW |
63 | .bus = &cpu_subsys, |
64 | .acpi_match_table = processor_device_ids, | |
65 | .probe = acpi_processor_start, | |
66 | .remove = acpi_processor_stop, | |
1da177e4 LT |
67 | }; |
68 | ||
ac212b69 | 69 | static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 70 | { |
ac212b69 | 71 | struct acpi_device *device = data; |
b26e9286 | 72 | struct acpi_processor *pr; |
e790cc8b | 73 | int saved; |
1da177e4 | 74 | |
ac212b69 RW |
75 | if (device->handle != handle) |
76 | return; | |
77 | ||
78 | pr = acpi_driver_data(device); | |
1da177e4 | 79 | if (!pr) |
d550d98d | 80 | return; |
1da177e4 | 81 | |
1da177e4 LT |
82 | switch (event) { |
83 | case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: | |
e790cc8b | 84 | saved = pr->performance_platform_limit; |
d81c45e1 | 85 | acpi_processor_ppc_has_changed(pr, 1); |
e790cc8b AS |
86 | if (saved == pr->performance_platform_limit) |
87 | break; | |
962ce8ca | 88 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
0794469d | 89 | dev_name(&device->dev), event, |
962ce8ca | 90 | pr->performance_platform_limit); |
1da177e4 LT |
91 | break; |
92 | case ACPI_PROCESSOR_NOTIFY_POWER: | |
93 | acpi_processor_cst_has_changed(pr); | |
962ce8ca | 94 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
0794469d | 95 | dev_name(&device->dev), event, 0); |
1da177e4 | 96 | break; |
01854e69 LY |
97 | case ACPI_PROCESSOR_NOTIFY_THROTTLING: |
98 | acpi_processor_tstate_has_changed(pr); | |
962ce8ca | 99 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
0794469d | 100 | dev_name(&device->dev), event, 0); |
879dca01 | 101 | break; |
1da177e4 LT |
102 | default: |
103 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 104 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
105 | break; |
106 | } | |
107 | ||
d550d98d | 108 | return; |
1da177e4 LT |
109 | } |
110 | ||
fe7bf106 | 111 | static int __acpi_processor_start(struct acpi_device *device); |
ac212b69 | 112 | |
fe7bf106 | 113 | static int acpi_cpu_soft_notify(struct notifier_block *nfb, |
ac212b69 | 114 | unsigned long action, void *hcpu) |
729c6ba3 VP |
115 | { |
116 | unsigned int cpu = (unsigned long)hcpu; | |
706546d0 | 117 | struct acpi_processor *pr = per_cpu(processors, cpu); |
ac212b69 | 118 | struct acpi_device *device; |
ea9c167d | 119 | action &= ~CPU_TASKS_FROZEN; |
729c6ba3 | 120 | |
8da83734 TK |
121 | /* |
122 | * CPU_STARTING and CPU_DYING must not sleep. Return here since | |
123 | * acpi_bus_get_device() may sleep. | |
124 | */ | |
125 | if (action == CPU_STARTING || action == CPU_DYING) | |
126 | return NOTIFY_DONE; | |
127 | ||
ac212b69 RW |
128 | if (!pr || acpi_bus_get_device(pr->handle, &device)) |
129 | return NOTIFY_DONE; | |
130 | ||
131 | if (action == CPU_ONLINE) { | |
132 | /* | |
133 | * CPU got physically hotplugged and onlined for the first time: | |
134 | * Initialize missing things. | |
99b72508 TR |
135 | */ |
136 | if (pr->flags.need_hotplug_init) { | |
ac212b69 RW |
137 | int ret; |
138 | ||
47db4547 TK |
139 | pr_info("Will online and init hotplugged CPU: %d\n", |
140 | pr->id); | |
99b72508 | 141 | pr->flags.need_hotplug_init = 0; |
ac212b69 RW |
142 | ret = __acpi_processor_start(device); |
143 | WARN(ret, "Failed to start CPU: %d\n", pr->id); | |
99b72508 | 144 | } else { |
ac212b69 | 145 | /* Normal CPU soft online event. */ |
99b72508 | 146 | acpi_processor_ppc_has_changed(pr, 0); |
b7db60f4 | 147 | acpi_processor_hotplug(pr); |
99b72508 TR |
148 | acpi_processor_reevaluate_tstate(pr, action); |
149 | acpi_processor_tstate_has_changed(pr); | |
150 | } | |
ac212b69 RW |
151 | } else if (action == CPU_DEAD) { |
152 | /* Invalidate flag.throttling after the CPU is offline. */ | |
5a344a50 ZY |
153 | acpi_processor_reevaluate_tstate(pr, action); |
154 | } | |
729c6ba3 VP |
155 | return NOTIFY_OK; |
156 | } | |
157 | ||
8ce344c6 | 158 | static struct notifier_block acpi_cpu_notifier = { |
729c6ba3 VP |
159 | .notifier_call = acpi_cpu_soft_notify, |
160 | }; | |
161 | ||
239708a3 AC |
162 | #ifdef CONFIG_ACPI_CPU_FREQ_PSS |
163 | static int acpi_pss_perf_init(struct acpi_processor *pr, | |
164 | struct acpi_device *device) | |
54d5dcc4 | 165 | { |
54d5dcc4 TR |
166 | int result = 0; |
167 | ||
54d5dcc4 | 168 | acpi_processor_ppc_has_changed(pr, 0); |
239708a3 | 169 | |
54d5dcc4 | 170 | acpi_processor_get_throttling_info(pr); |
22e7551e LT |
171 | |
172 | if (pr->flags.throttling) | |
173 | pr->flags.limit = 1; | |
54d5dcc4 | 174 | |
54d5dcc4 TR |
175 | pr->cdev = thermal_cooling_device_register("Processor", device, |
176 | &processor_cooling_ops); | |
177 | if (IS_ERR(pr->cdev)) { | |
178 | result = PTR_ERR(pr->cdev); | |
239708a3 | 179 | return result; |
54d5dcc4 TR |
180 | } |
181 | ||
182 | dev_dbg(&device->dev, "registered as cooling_device%d\n", | |
183 | pr->cdev->id); | |
184 | ||
185 | result = sysfs_create_link(&device->dev.kobj, | |
186 | &pr->cdev->device.kobj, | |
187 | "thermal_cooling"); | |
188 | if (result) { | |
47db4547 TK |
189 | dev_err(&device->dev, |
190 | "Failed to create sysfs link 'thermal_cooling'\n"); | |
54d5dcc4 TR |
191 | goto err_thermal_unregister; |
192 | } | |
239708a3 | 193 | |
54d5dcc4 TR |
194 | result = sysfs_create_link(&pr->cdev->device.kobj, |
195 | &device->dev.kobj, | |
196 | "device"); | |
197 | if (result) { | |
47db4547 TK |
198 | dev_err(&pr->cdev->device, |
199 | "Failed to create sysfs link 'device'\n"); | |
54d5dcc4 TR |
200 | goto err_remove_sysfs_thermal; |
201 | } | |
202 | ||
ac212b69 RW |
203 | sysfs_remove_link(&pr->cdev->device.kobj, "device"); |
204 | err_remove_sysfs_thermal: | |
54d5dcc4 | 205 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
ac212b69 | 206 | err_thermal_unregister: |
54d5dcc4 | 207 | thermal_cooling_device_unregister(pr->cdev); |
239708a3 AC |
208 | |
209 | return result; | |
210 | } | |
211 | ||
212 | static void acpi_pss_perf_exit(struct acpi_processor *pr, | |
213 | struct acpi_device *device) | |
214 | { | |
215 | if (pr->cdev) { | |
216 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); | |
217 | sysfs_remove_link(&pr->cdev->device.kobj, "device"); | |
218 | thermal_cooling_device_unregister(pr->cdev); | |
219 | pr->cdev = NULL; | |
220 | } | |
221 | } | |
222 | #else | |
223 | static inline int acpi_pss_perf_init(struct acpi_processor *pr, | |
224 | struct acpi_device *device) | |
225 | { | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static inline void acpi_pss_perf_exit(struct acpi_processor *pr, | |
230 | struct acpi_device *device) {} | |
231 | #endif /* CONFIG_ACPI_CPU_FREQ_PSS */ | |
232 | ||
233 | static int __acpi_processor_start(struct acpi_device *device) | |
234 | { | |
235 | struct acpi_processor *pr = acpi_driver_data(device); | |
236 | acpi_status status; | |
237 | int result = 0; | |
238 | ||
239 | if (!pr) | |
240 | return -ENODEV; | |
241 | ||
242 | if (pr->flags.need_hotplug_init) | |
243 | return 0; | |
244 | ||
245 | if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver) | |
246 | acpi_processor_power_init(pr); | |
247 | ||
248 | result = acpi_pss_perf_init(pr, device); | |
249 | if (result) | |
250 | goto err_power_exit; | |
251 | ||
252 | status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
253 | acpi_processor_notify, device); | |
254 | if (ACPI_SUCCESS(status)) | |
255 | return 0; | |
256 | ||
257 | err_power_exit: | |
38a991b6 | 258 | acpi_processor_power_exit(pr); |
54d5dcc4 TR |
259 | return result; |
260 | } | |
261 | ||
fe7bf106 | 262 | static int acpi_processor_start(struct device *dev) |
1da177e4 | 263 | { |
d0a7edbb | 264 | struct acpi_device *device = ACPI_COMPANION(dev); |
1da177e4 | 265 | |
d0a7edbb | 266 | if (!device) |
ac212b69 | 267 | return -ENODEV; |
1da177e4 | 268 | |
ac212b69 | 269 | return __acpi_processor_start(device); |
1da177e4 LT |
270 | } |
271 | ||
ac212b69 | 272 | static int acpi_processor_stop(struct device *dev) |
1da177e4 | 273 | { |
d0a7edbb | 274 | struct acpi_device *device = ACPI_COMPANION(dev); |
ac212b69 | 275 | struct acpi_processor *pr; |
1da177e4 | 276 | |
d0a7edbb | 277 | if (!device) |
ac212b69 | 278 | return 0; |
1da177e4 | 279 | |
ac212b69 RW |
280 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, |
281 | acpi_processor_notify); | |
1da177e4 | 282 | |
50dd0969 | 283 | pr = acpi_driver_data(device); |
ac212b69 RW |
284 | if (!pr) |
285 | return 0; | |
38a991b6 | 286 | acpi_processor_power_exit(pr); |
1da177e4 | 287 | |
239708a3 AC |
288 | acpi_pss_perf_exit(pr, device); |
289 | ||
d550d98d | 290 | return 0; |
1da177e4 LT |
291 | } |
292 | ||
1da177e4 LT |
293 | /* |
294 | * We keep the driver loaded even when ACPI is not running. | |
295 | * This is needed for the powernow-k8 driver, that works even without | |
296 | * ACPI, but needs symbols from this driver | |
297 | */ | |
298 | ||
ac212b69 | 299 | static int __init acpi_processor_driver_init(void) |
1da177e4 | 300 | { |
4be44fcd | 301 | int result = 0; |
1da177e4 | 302 | |
ce8442b5 YL |
303 | if (acpi_disabled) |
304 | return 0; | |
305 | ||
ac212b69 | 306 | result = driver_register(&acpi_processor_driver); |
4f86d3a8 | 307 | if (result < 0) |
46bcfad7 | 308 | return result; |
1da177e4 | 309 | |
0a3b15ac | 310 | acpi_processor_syscore_init(); |
ac212b69 | 311 | register_hotcpu_notifier(&acpi_cpu_notifier); |
1da177e4 | 312 | acpi_thermal_cpufreq_init(); |
1da177e4 | 313 | acpi_processor_ppc_init(); |
1180509f | 314 | acpi_processor_throttling_init(); |
d550d98d | 315 | return 0; |
1da177e4 LT |
316 | } |
317 | ||
ac212b69 | 318 | static void __exit acpi_processor_driver_exit(void) |
1da177e4 | 319 | { |
ce8442b5 YL |
320 | if (acpi_disabled) |
321 | return; | |
322 | ||
1da177e4 | 323 | acpi_processor_ppc_exit(); |
1da177e4 | 324 | acpi_thermal_cpufreq_exit(); |
ac212b69 | 325 | unregister_hotcpu_notifier(&acpi_cpu_notifier); |
0a3b15ac | 326 | acpi_processor_syscore_exit(); |
ac212b69 | 327 | driver_unregister(&acpi_processor_driver); |
1da177e4 LT |
328 | } |
329 | ||
ac212b69 RW |
330 | module_init(acpi_processor_driver_init); |
331 | module_exit(acpi_processor_driver_exit); | |
1da177e4 | 332 | |
1da177e4 | 333 | MODULE_ALIAS("processor"); |