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[karo-tx-linux.git] / drivers / acpi / processor_driver.c
1 /*
2  * processor_driver.c - ACPI Processor Driver
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  *  Copyright (C) 2013, Intel Corporation
10  *                      Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
29  */
30
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/init.h>
34 #include <linux/cpufreq.h>
35 #include <linux/cpu.h>
36 #include <linux/cpuidle.h>
37 #include <linux/slab.h>
38 #include <linux/acpi.h>
39
40 #include <acpi/processor.h>
41
42 #include "internal.h"
43
44 #define PREFIX "ACPI: "
45
46 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
47 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
48 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
49
50 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
51 ACPI_MODULE_NAME("processor_driver");
52
53 MODULE_AUTHOR("Paul Diefenbaugh");
54 MODULE_DESCRIPTION("ACPI Processor Driver");
55 MODULE_LICENSE("GPL");
56
57 static int acpi_processor_start(struct device *dev);
58 static int acpi_processor_stop(struct device *dev);
59
60 static const struct acpi_device_id processor_device_ids[] = {
61         {ACPI_PROCESSOR_OBJECT_HID, 0},
62         {ACPI_PROCESSOR_DEVICE_HID, 0},
63         {"", 0},
64 };
65 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
66
67 static struct device_driver acpi_processor_driver = {
68         .name = "processor",
69         .bus = &cpu_subsys,
70         .acpi_match_table = processor_device_ids,
71         .probe = acpi_processor_start,
72         .remove = acpi_processor_stop,
73 };
74
75 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
76 {
77         struct acpi_device *device = data;
78         struct acpi_processor *pr;
79         int saved;
80
81         if (device->handle != handle)
82                 return;
83
84         pr = acpi_driver_data(device);
85         if (!pr)
86                 return;
87
88         switch (event) {
89         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
90                 saved = pr->performance_platform_limit;
91                 acpi_processor_ppc_has_changed(pr, 1);
92                 if (saved == pr->performance_platform_limit)
93                         break;
94                 acpi_bus_generate_netlink_event(device->pnp.device_class,
95                                                   dev_name(&device->dev), event,
96                                                   pr->performance_platform_limit);
97                 break;
98         case ACPI_PROCESSOR_NOTIFY_POWER:
99                 acpi_processor_cst_has_changed(pr);
100                 acpi_bus_generate_netlink_event(device->pnp.device_class,
101                                                   dev_name(&device->dev), event, 0);
102                 break;
103         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
104                 acpi_processor_tstate_has_changed(pr);
105                 acpi_bus_generate_netlink_event(device->pnp.device_class,
106                                                   dev_name(&device->dev), event, 0);
107                 break;
108         default:
109                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
110                                   "Unsupported event [0x%x]\n", event));
111                 break;
112         }
113
114         return;
115 }
116
117 static int __acpi_processor_start(struct acpi_device *device);
118
119 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
120                                           unsigned long action, void *hcpu)
121 {
122         unsigned int cpu = (unsigned long)hcpu;
123         struct acpi_processor *pr = per_cpu(processors, cpu);
124         struct acpi_device *device;
125
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.
133                  */
134                 if (pr->flags.need_hotplug_init) {
135                         int ret;
136
137                         pr_info("Will online and init hotplugged CPU: %d\n",
138                                 pr->id);
139                         pr->flags.need_hotplug_init = 0;
140                         ret = __acpi_processor_start(device);
141                         WARN(ret, "Failed to start CPU: %d\n", pr->id);
142                 } else {
143                         /* Normal CPU soft online event. */
144                         acpi_processor_ppc_has_changed(pr, 0);
145                         acpi_processor_hotplug(pr);
146                         acpi_processor_reevaluate_tstate(pr, action);
147                         acpi_processor_tstate_has_changed(pr);
148                 }
149         } else if (action == CPU_DEAD) {
150                 /* Invalidate flag.throttling after the CPU is offline. */
151                 acpi_processor_reevaluate_tstate(pr, action);
152         }
153         return NOTIFY_OK;
154 }
155
156 static struct notifier_block __refdata acpi_cpu_notifier = {
157             .notifier_call = acpi_cpu_soft_notify,
158 };
159
160 static int __acpi_processor_start(struct acpi_device *device)
161 {
162         struct acpi_processor *pr = acpi_driver_data(device);
163         acpi_status status;
164         int result = 0;
165
166         if (!pr)
167                 return -ENODEV;
168
169         if (pr->flags.need_hotplug_init)
170                 return 0;
171
172 #ifdef CONFIG_CPU_FREQ
173         acpi_processor_ppc_has_changed(pr, 0);
174         acpi_processor_load_module(pr);
175 #endif
176         acpi_processor_get_throttling_info(pr);
177
178         if (pr->flags.throttling)
179                 pr->flags.limit = 1;
180
181         if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
182                 acpi_processor_power_init(pr);
183
184         pr->cdev = thermal_cooling_device_register("Processor", device,
185                                                    &processor_cooling_ops);
186         if (IS_ERR(pr->cdev)) {
187                 result = PTR_ERR(pr->cdev);
188                 goto err_power_exit;
189         }
190
191         dev_dbg(&device->dev, "registered as cooling_device%d\n",
192                 pr->cdev->id);
193
194         result = sysfs_create_link(&device->dev.kobj,
195                                    &pr->cdev->device.kobj,
196                                    "thermal_cooling");
197         if (result) {
198                 dev_err(&device->dev,
199                         "Failed to create sysfs link 'thermal_cooling'\n");
200                 goto err_thermal_unregister;
201         }
202         result = sysfs_create_link(&pr->cdev->device.kobj,
203                                    &device->dev.kobj,
204                                    "device");
205         if (result) {
206                 dev_err(&pr->cdev->device,
207                         "Failed to create sysfs link 'device'\n");
208                 goto err_remove_sysfs_thermal;
209         }
210
211         status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
212                                              acpi_processor_notify, device);
213         if (ACPI_SUCCESS(status))
214                 return 0;
215
216         sysfs_remove_link(&pr->cdev->device.kobj, "device");
217  err_remove_sysfs_thermal:
218         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
219  err_thermal_unregister:
220         thermal_cooling_device_unregister(pr->cdev);
221  err_power_exit:
222         acpi_processor_power_exit(pr);
223         return result;
224 }
225
226 static int acpi_processor_start(struct device *dev)
227 {
228         struct acpi_device *device;
229
230         if (acpi_bus_get_device(ACPI_HANDLE(dev), &device))
231                 return -ENODEV;
232
233         return __acpi_processor_start(device);
234 }
235
236 static int acpi_processor_stop(struct device *dev)
237 {
238         struct acpi_device *device;
239         struct acpi_processor *pr;
240
241         if (acpi_bus_get_device(ACPI_HANDLE(dev), &device))
242                 return 0;
243
244         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
245                                    acpi_processor_notify);
246
247         pr = acpi_driver_data(device);
248         if (!pr)
249                 return 0;
250
251         acpi_processor_power_exit(pr);
252
253         if (pr->cdev) {
254                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
255                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
256                 thermal_cooling_device_unregister(pr->cdev);
257                 pr->cdev = NULL;
258         }
259         return 0;
260 }
261
262 /*
263  * We keep the driver loaded even when ACPI is not running.
264  * This is needed for the powernow-k8 driver, that works even without
265  * ACPI, but needs symbols from this driver
266  */
267
268 static int __init acpi_processor_driver_init(void)
269 {
270         int result = 0;
271
272         if (acpi_disabled)
273                 return 0;
274
275         result = driver_register(&acpi_processor_driver);
276         if (result < 0)
277                 return result;
278
279         acpi_processor_syscore_init();
280         register_hotcpu_notifier(&acpi_cpu_notifier);
281         acpi_thermal_cpufreq_init();
282         acpi_processor_ppc_init();
283         acpi_processor_throttling_init();
284         return 0;
285 }
286
287 static void __exit acpi_processor_driver_exit(void)
288 {
289         if (acpi_disabled)
290                 return;
291
292         acpi_processor_ppc_exit();
293         acpi_thermal_cpufreq_exit();
294         unregister_hotcpu_notifier(&acpi_cpu_notifier);
295         acpi_processor_syscore_exit();
296         driver_unregister(&acpi_processor_driver);
297 }
298
299 module_init(acpi_processor_driver_init);
300 module_exit(acpi_processor_driver_exit);
301
302 MODULE_ALIAS("processor");