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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * processor_driver.c - ACPI Processor Driver
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
8 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
9 * - Added processor hotplug support
10 * Copyright (C) 2013, Intel Corporation
11 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/cpufreq.h>
18#include <linux/cpu.h>
19#include <linux/cpuidle.h>
20#include <linux/slab.h>
21#include <linux/acpi.h>
22
23#include <acpi/processor.h>
24
25#include "internal.h"
26
27#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
28#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
29#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
30#define ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED 0x85
31
32MODULE_AUTHOR("Paul Diefenbaugh");
33MODULE_DESCRIPTION("ACPI Processor Driver");
34MODULE_LICENSE("GPL");
35
36static int acpi_processor_stop(struct device *dev);
37
38static const struct acpi_device_id processor_device_ids[] = {
39 {ACPI_PROCESSOR_OBJECT_HID, 0},
40 {ACPI_PROCESSOR_DEVICE_HID, 0},
41 {"", 0},
42};
43MODULE_DEVICE_TABLE(acpi, processor_device_ids);
44
45static struct device_driver acpi_processor_driver = {
46 .name = "processor",
47 .bus = &cpu_subsys,
48 .acpi_match_table = processor_device_ids,
49 .remove = acpi_processor_stop,
50};
51
52static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
53{
54 struct acpi_device *device = data;
55 struct acpi_processor *pr;
56 int saved;
57
58 if (device->handle != handle)
59 return;
60
61 pr = acpi_driver_data(device);
62 if (!pr)
63 return;
64
65 switch (event) {
66 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
67 saved = pr->performance_platform_limit;
68 acpi_processor_ppc_has_changed(pr, 1);
69 if (saved == pr->performance_platform_limit)
70 break;
71 acpi_bus_generate_netlink_event(device->pnp.device_class,
72 dev_name(&device->dev), event,
73 pr->performance_platform_limit);
74 break;
75 case ACPI_PROCESSOR_NOTIFY_POWER:
76 acpi_processor_power_state_has_changed(pr);
77 acpi_bus_generate_netlink_event(device->pnp.device_class,
78 dev_name(&device->dev), event, 0);
79 break;
80 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
81 acpi_processor_tstate_has_changed(pr);
82 acpi_bus_generate_netlink_event(device->pnp.device_class,
83 dev_name(&device->dev), event, 0);
84 break;
85 case ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED:
86 cpufreq_update_limits(pr->id);
87 acpi_bus_generate_netlink_event(device->pnp.device_class,
88 dev_name(&device->dev), event, 0);
89 break;
90 default:
91 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
92 break;
93 }
94
95 return;
96}
97
98static int __acpi_processor_start(struct acpi_device *device);
99
100static int acpi_soft_cpu_online(unsigned int cpu)
101{
102 struct acpi_processor *pr = per_cpu(processors, cpu);
103 struct acpi_device *device;
104
105 if (!pr)
106 return 0;
107
108 device = acpi_fetch_acpi_dev(pr->handle);
109 if (!device)
110 return 0;
111
112 /*
113 * CPU got physically hotplugged and onlined for the first time:
114 * Initialize missing things.
115 */
116 if (!pr->flags.previously_online) {
117 int ret;
118
119 ret = __acpi_processor_start(device);
120 WARN(ret, "Failed to start CPU: %d\n", pr->id);
121 } else {
122 /* Normal CPU soft online event. */
123 acpi_processor_ppc_has_changed(pr, 0);
124 acpi_processor_hotplug(pr);
125 acpi_processor_reevaluate_tstate(pr, false);
126 acpi_processor_tstate_has_changed(pr);
127 }
128 return 0;
129}
130
131static int acpi_soft_cpu_dead(unsigned int cpu)
132{
133 struct acpi_processor *pr = per_cpu(processors, cpu);
134
135 if (!pr || !acpi_fetch_acpi_dev(pr->handle))
136 return 0;
137
138 acpi_processor_reevaluate_tstate(pr, true);
139 return 0;
140}
141
142#ifdef CONFIG_ACPI_CPU_FREQ_PSS
143static void acpi_pss_perf_init(struct acpi_processor *pr)
144{
145 acpi_processor_ppc_has_changed(pr, 0);
146
147 acpi_processor_get_throttling_info(pr);
148
149 if (pr->flags.throttling)
150 pr->flags.limit = 1;
151}
152#else
153static inline void acpi_pss_perf_init(struct acpi_processor *pr) {}
154#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
155
156static int __acpi_processor_start(struct acpi_device *device)
157{
158 struct acpi_processor *pr = acpi_driver_data(device);
159 acpi_status status;
160 int result = 0;
161
162 if (!pr)
163 return -ENODEV;
164
165 result = acpi_cppc_processor_probe(pr);
166 if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS))
167 dev_dbg(&device->dev, "CPPC data invalid or not present\n");
168
169 if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
170 acpi_processor_power_init(pr);
171
172 acpi_pss_perf_init(pr);
173
174 result = acpi_processor_thermal_init(pr, device);
175 if (result)
176 goto err_power_exit;
177
178 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
179 acpi_processor_notify, device);
180 if (!ACPI_SUCCESS(status)) {
181 result = -ENODEV;
182 goto err_thermal_exit;
183 }
184 pr->flags.previously_online = 1;
185
186 return 0;
187
188err_thermal_exit:
189 acpi_processor_thermal_exit(pr, device);
190err_power_exit:
191 acpi_processor_power_exit(pr);
192 return result;
193}
194
195static int acpi_processor_stop(struct device *dev)
196{
197 struct acpi_device *device = ACPI_COMPANION(dev);
198 struct acpi_processor *pr;
199
200 if (!device)
201 return 0;
202
203 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
204 acpi_processor_notify);
205
206 pr = acpi_driver_data(device);
207 if (!pr)
208 return 0;
209 acpi_processor_power_exit(pr);
210
211 acpi_cppc_processor_exit(pr);
212
213 acpi_processor_thermal_exit(pr, device);
214
215 return 0;
216}
217
218bool acpi_processor_cpufreq_init;
219
220static int acpi_processor_notifier(struct notifier_block *nb,
221 unsigned long event, void *data)
222{
223 struct cpufreq_policy *policy = data;
224
225 if (event == CPUFREQ_CREATE_POLICY) {
226 acpi_thermal_cpufreq_init(policy);
227 acpi_processor_ppc_init(policy);
228 } else if (event == CPUFREQ_REMOVE_POLICY) {
229 acpi_processor_ppc_exit(policy);
230 acpi_thermal_cpufreq_exit(policy);
231 }
232
233 return 0;
234}
235
236static struct notifier_block acpi_processor_notifier_block = {
237 .notifier_call = acpi_processor_notifier,
238};
239
240void __weak acpi_processor_init_invariance_cppc(void)
241{ }
242
243/*
244 * We keep the driver loaded even when ACPI is not running.
245 * This is needed for the powernow-k8 driver, that works even without
246 * ACPI, but needs symbols from this driver
247 */
248static enum cpuhp_state hp_online;
249static int __init acpi_processor_driver_init(void)
250{
251 int result = 0;
252
253 if (acpi_disabled)
254 return 0;
255
256 if (!cpufreq_register_notifier(&acpi_processor_notifier_block,
257 CPUFREQ_POLICY_NOTIFIER)) {
258 acpi_processor_cpufreq_init = true;
259 acpi_processor_ignore_ppc_init();
260 }
261
262 result = driver_register(&acpi_processor_driver);
263 if (result < 0)
264 return result;
265
266 result = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
267 "acpi/cpu-drv:online",
268 acpi_soft_cpu_online, NULL);
269 if (result < 0)
270 goto err;
271 hp_online = result;
272 cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead",
273 NULL, acpi_soft_cpu_dead);
274
275 acpi_processor_throttling_init();
276
277 /*
278 * Frequency invariance calculations on AMD platforms can't be run until
279 * after acpi_cppc_processor_probe() has been called for all online CPUs
280 */
281 acpi_processor_init_invariance_cppc();
282 return 0;
283err:
284 driver_unregister(&acpi_processor_driver);
285 return result;
286}
287
288static void __exit acpi_processor_driver_exit(void)
289{
290 if (acpi_disabled)
291 return;
292
293 if (acpi_processor_cpufreq_init) {
294 cpufreq_unregister_notifier(&acpi_processor_notifier_block,
295 CPUFREQ_POLICY_NOTIFIER);
296 acpi_processor_cpufreq_init = false;
297 }
298
299 cpuhp_remove_state_nocalls(hp_online);
300 cpuhp_remove_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD);
301 driver_unregister(&acpi_processor_driver);
302}
303
304module_init(acpi_processor_driver_init);
305module_exit(acpi_processor_driver_exit);
306
307MODULE_ALIAS("processor");
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 ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
45#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
46#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
47
48#define _COMPONENT ACPI_PROCESSOR_COMPONENT
49ACPI_MODULE_NAME("processor_driver");
50
51MODULE_AUTHOR("Paul Diefenbaugh");
52MODULE_DESCRIPTION("ACPI Processor Driver");
53MODULE_LICENSE("GPL");
54
55static int acpi_processor_start(struct device *dev);
56static int acpi_processor_stop(struct device *dev);
57
58static const struct acpi_device_id processor_device_ids[] = {
59 {ACPI_PROCESSOR_OBJECT_HID, 0},
60 {ACPI_PROCESSOR_DEVICE_HID, 0},
61 {"", 0},
62};
63MODULE_DEVICE_TABLE(acpi, processor_device_ids);
64
65static struct device_driver acpi_processor_driver = {
66 .name = "processor",
67 .bus = &cpu_subsys,
68 .acpi_match_table = processor_device_ids,
69 .probe = acpi_processor_start,
70 .remove = acpi_processor_stop,
71};
72
73static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
74{
75 struct acpi_device *device = data;
76 struct acpi_processor *pr;
77 int saved;
78
79 if (device->handle != handle)
80 return;
81
82 pr = acpi_driver_data(device);
83 if (!pr)
84 return;
85
86 switch (event) {
87 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
88 saved = pr->performance_platform_limit;
89 acpi_processor_ppc_has_changed(pr, 1);
90 if (saved == pr->performance_platform_limit)
91 break;
92 acpi_bus_generate_netlink_event(device->pnp.device_class,
93 dev_name(&device->dev), event,
94 pr->performance_platform_limit);
95 break;
96 case ACPI_PROCESSOR_NOTIFY_POWER:
97 acpi_processor_cst_has_changed(pr);
98 acpi_bus_generate_netlink_event(device->pnp.device_class,
99 dev_name(&device->dev), event, 0);
100 break;
101 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
102 acpi_processor_tstate_has_changed(pr);
103 acpi_bus_generate_netlink_event(device->pnp.device_class,
104 dev_name(&device->dev), event, 0);
105 break;
106 default:
107 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
108 "Unsupported event [0x%x]\n", event));
109 break;
110 }
111
112 return;
113}
114
115static int __acpi_processor_start(struct acpi_device *device);
116
117static int acpi_cpu_soft_notify(struct notifier_block *nfb,
118 unsigned long action, void *hcpu)
119{
120 unsigned int cpu = (unsigned long)hcpu;
121 struct acpi_processor *pr = per_cpu(processors, cpu);
122 struct acpi_device *device;
123
124 if (!pr || acpi_bus_get_device(pr->handle, &device))
125 return NOTIFY_DONE;
126
127 if (action == CPU_ONLINE) {
128 /*
129 * CPU got physically hotplugged and onlined for the first time:
130 * Initialize missing things.
131 */
132 if (pr->flags.need_hotplug_init) {
133 int ret;
134
135 pr_info("Will online and init hotplugged CPU: %d\n",
136 pr->id);
137 pr->flags.need_hotplug_init = 0;
138 ret = __acpi_processor_start(device);
139 WARN(ret, "Failed to start CPU: %d\n", pr->id);
140 } else {
141 /* Normal CPU soft online event. */
142 acpi_processor_ppc_has_changed(pr, 0);
143 acpi_processor_hotplug(pr);
144 acpi_processor_reevaluate_tstate(pr, action);
145 acpi_processor_tstate_has_changed(pr);
146 }
147 } else if (action == CPU_DEAD) {
148 /* Invalidate flag.throttling after the CPU is offline. */
149 acpi_processor_reevaluate_tstate(pr, action);
150 }
151 return NOTIFY_OK;
152}
153
154static struct notifier_block __refdata acpi_cpu_notifier = {
155 .notifier_call = acpi_cpu_soft_notify,
156};
157
158static int __acpi_processor_start(struct acpi_device *device)
159{
160 struct acpi_processor *pr = acpi_driver_data(device);
161 acpi_status status;
162 int result = 0;
163
164 if (!pr)
165 return -ENODEV;
166
167 if (pr->flags.need_hotplug_init)
168 return 0;
169
170#ifdef CONFIG_CPU_FREQ
171 acpi_processor_ppc_has_changed(pr, 0);
172#endif
173 acpi_processor_get_throttling_info(pr);
174
175 if (pr->flags.throttling)
176 pr->flags.limit = 1;
177
178 if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
179 acpi_processor_power_init(pr);
180
181 pr->cdev = thermal_cooling_device_register("Processor", device,
182 &processor_cooling_ops);
183 if (IS_ERR(pr->cdev)) {
184 result = PTR_ERR(pr->cdev);
185 goto err_power_exit;
186 }
187
188 dev_dbg(&device->dev, "registered as cooling_device%d\n",
189 pr->cdev->id);
190
191 result = sysfs_create_link(&device->dev.kobj,
192 &pr->cdev->device.kobj,
193 "thermal_cooling");
194 if (result) {
195 dev_err(&device->dev,
196 "Failed to create sysfs link 'thermal_cooling'\n");
197 goto err_thermal_unregister;
198 }
199 result = sysfs_create_link(&pr->cdev->device.kobj,
200 &device->dev.kobj,
201 "device");
202 if (result) {
203 dev_err(&pr->cdev->device,
204 "Failed to create sysfs link 'device'\n");
205 goto err_remove_sysfs_thermal;
206 }
207
208 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
209 acpi_processor_notify, device);
210 if (ACPI_SUCCESS(status))
211 return 0;
212
213 sysfs_remove_link(&pr->cdev->device.kobj, "device");
214 err_remove_sysfs_thermal:
215 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
216 err_thermal_unregister:
217 thermal_cooling_device_unregister(pr->cdev);
218 err_power_exit:
219 acpi_processor_power_exit(pr);
220 return result;
221}
222
223static int acpi_processor_start(struct device *dev)
224{
225 struct acpi_device *device = ACPI_COMPANION(dev);
226
227 if (!device)
228 return -ENODEV;
229
230 return __acpi_processor_start(device);
231}
232
233static int acpi_processor_stop(struct device *dev)
234{
235 struct acpi_device *device = ACPI_COMPANION(dev);
236 struct acpi_processor *pr;
237
238 if (!device)
239 return 0;
240
241 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
242 acpi_processor_notify);
243
244 pr = acpi_driver_data(device);
245 if (!pr)
246 return 0;
247
248 acpi_processor_power_exit(pr);
249
250 if (pr->cdev) {
251 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
252 sysfs_remove_link(&pr->cdev->device.kobj, "device");
253 thermal_cooling_device_unregister(pr->cdev);
254 pr->cdev = NULL;
255 }
256 return 0;
257}
258
259/*
260 * We keep the driver loaded even when ACPI is not running.
261 * This is needed for the powernow-k8 driver, that works even without
262 * ACPI, but needs symbols from this driver
263 */
264
265static int __init acpi_processor_driver_init(void)
266{
267 int result = 0;
268
269 if (acpi_disabled)
270 return 0;
271
272 result = driver_register(&acpi_processor_driver);
273 if (result < 0)
274 return result;
275
276 acpi_processor_syscore_init();
277 register_hotcpu_notifier(&acpi_cpu_notifier);
278 acpi_thermal_cpufreq_init();
279 acpi_processor_ppc_init();
280 acpi_processor_throttling_init();
281 return 0;
282}
283
284static void __exit acpi_processor_driver_exit(void)
285{
286 if (acpi_disabled)
287 return;
288
289 acpi_processor_ppc_exit();
290 acpi_thermal_cpufreq_exit();
291 unregister_hotcpu_notifier(&acpi_cpu_notifier);
292 acpi_processor_syscore_exit();
293 driver_unregister(&acpi_processor_driver);
294}
295
296module_init(acpi_processor_driver_init);
297module_exit(acpi_processor_driver_exit);
298
299MODULE_ALIAS("processor");