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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// 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
31MODULE_AUTHOR("Paul Diefenbaugh");
32MODULE_DESCRIPTION("ACPI Processor Driver");
33MODULE_LICENSE("GPL");
34
35static int acpi_processor_start(struct device *dev);
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 .probe = acpi_processor_start,
50 .remove = acpi_processor_stop,
51};
52
53static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
54{
55 struct acpi_device *device = data;
56 struct acpi_processor *pr;
57 int saved;
58
59 if (device->handle != handle)
60 return;
61
62 pr = acpi_driver_data(device);
63 if (!pr)
64 return;
65
66 switch (event) {
67 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
68 saved = pr->performance_platform_limit;
69 acpi_processor_ppc_has_changed(pr, 1);
70 if (saved == pr->performance_platform_limit)
71 break;
72 acpi_bus_generate_netlink_event(device->pnp.device_class,
73 dev_name(&device->dev), event,
74 pr->performance_platform_limit);
75 break;
76 case ACPI_PROCESSOR_NOTIFY_POWER:
77 acpi_processor_power_state_has_changed(pr);
78 acpi_bus_generate_netlink_event(device->pnp.device_class,
79 dev_name(&device->dev), event, 0);
80 break;
81 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
82 acpi_processor_tstate_has_changed(pr);
83 acpi_bus_generate_netlink_event(device->pnp.device_class,
84 dev_name(&device->dev), event, 0);
85 break;
86 default:
87 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
88 break;
89 }
90
91 return;
92}
93
94static int __acpi_processor_start(struct acpi_device *device);
95
96static int acpi_soft_cpu_online(unsigned int cpu)
97{
98 struct acpi_processor *pr = per_cpu(processors, cpu);
99 struct acpi_device *device;
100
101 if (!pr)
102 return 0;
103
104 device = acpi_fetch_acpi_dev(pr->handle);
105 if (!device)
106 return 0;
107
108 /*
109 * CPU got physically hotplugged and onlined for the first time:
110 * Initialize missing things.
111 */
112 if (pr->flags.need_hotplug_init) {
113 int ret;
114
115 pr_info("Will online and init hotplugged CPU: %d\n",
116 pr->id);
117 pr->flags.need_hotplug_init = 0;
118 ret = __acpi_processor_start(device);
119 WARN(ret, "Failed to start CPU: %d\n", pr->id);
120 } else {
121 /* Normal CPU soft online event. */
122 acpi_processor_ppc_has_changed(pr, 0);
123 acpi_processor_hotplug(pr);
124 acpi_processor_reevaluate_tstate(pr, false);
125 acpi_processor_tstate_has_changed(pr);
126 }
127 return 0;
128}
129
130static int acpi_soft_cpu_dead(unsigned int cpu)
131{
132 struct acpi_processor *pr = per_cpu(processors, cpu);
133
134 if (!pr || !acpi_fetch_acpi_dev(pr->handle))
135 return 0;
136
137 acpi_processor_reevaluate_tstate(pr, true);
138 return 0;
139}
140
141#ifdef CONFIG_ACPI_CPU_FREQ_PSS
142static void acpi_pss_perf_init(struct acpi_processor *pr)
143{
144 acpi_processor_ppc_has_changed(pr, 0);
145
146 acpi_processor_get_throttling_info(pr);
147
148 if (pr->flags.throttling)
149 pr->flags.limit = 1;
150}
151#else
152static inline void acpi_pss_perf_init(struct acpi_processor *pr) {}
153#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
154
155static int __acpi_processor_start(struct acpi_device *device)
156{
157 struct acpi_processor *pr = acpi_driver_data(device);
158 acpi_status status;
159 int result = 0;
160
161 if (!pr)
162 return -ENODEV;
163
164 if (pr->flags.need_hotplug_init)
165 return 0;
166
167 result = acpi_cppc_processor_probe(pr);
168 if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS))
169 dev_dbg(&device->dev, "CPPC data invalid or not present\n");
170
171 if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
172 acpi_processor_power_init(pr);
173
174 acpi_pss_perf_init(pr);
175
176 result = acpi_processor_thermal_init(pr, device);
177 if (result)
178 goto err_power_exit;
179
180 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
181 acpi_processor_notify, device);
182 if (ACPI_SUCCESS(status))
183 return 0;
184
185 result = -ENODEV;
186 acpi_processor_thermal_exit(pr, device);
187
188err_power_exit:
189 acpi_processor_power_exit(pr);
190 return result;
191}
192
193static int acpi_processor_start(struct device *dev)
194{
195 struct acpi_device *device = ACPI_COMPANION(dev);
196 int ret;
197
198 if (!device)
199 return -ENODEV;
200
201 /* Protect against concurrent CPU hotplug operations */
202 cpu_hotplug_disable();
203 ret = __acpi_processor_start(device);
204 cpu_hotplug_enable();
205 return ret;
206}
207
208static int acpi_processor_stop(struct device *dev)
209{
210 struct acpi_device *device = ACPI_COMPANION(dev);
211 struct acpi_processor *pr;
212
213 if (!device)
214 return 0;
215
216 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
217 acpi_processor_notify);
218
219 pr = acpi_driver_data(device);
220 if (!pr)
221 return 0;
222 acpi_processor_power_exit(pr);
223
224 acpi_cppc_processor_exit(pr);
225
226 acpi_processor_thermal_exit(pr, device);
227
228 return 0;
229}
230
231bool acpi_processor_cpufreq_init;
232
233static int acpi_processor_notifier(struct notifier_block *nb,
234 unsigned long event, void *data)
235{
236 struct cpufreq_policy *policy = data;
237
238 if (event == CPUFREQ_CREATE_POLICY) {
239 acpi_thermal_cpufreq_init(policy);
240 acpi_processor_ppc_init(policy);
241 } else if (event == CPUFREQ_REMOVE_POLICY) {
242 acpi_processor_ppc_exit(policy);
243 acpi_thermal_cpufreq_exit(policy);
244 }
245
246 return 0;
247}
248
249static struct notifier_block acpi_processor_notifier_block = {
250 .notifier_call = acpi_processor_notifier,
251};
252
253/*
254 * We keep the driver loaded even when ACPI is not running.
255 * This is needed for the powernow-k8 driver, that works even without
256 * ACPI, but needs symbols from this driver
257 */
258static enum cpuhp_state hp_online;
259static int __init acpi_processor_driver_init(void)
260{
261 int result = 0;
262
263 if (acpi_disabled)
264 return 0;
265
266 result = driver_register(&acpi_processor_driver);
267 if (result < 0)
268 return result;
269
270 result = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
271 "acpi/cpu-drv:online",
272 acpi_soft_cpu_online, NULL);
273 if (result < 0)
274 goto err;
275 hp_online = result;
276 cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead",
277 NULL, acpi_soft_cpu_dead);
278
279 if (!cpufreq_register_notifier(&acpi_processor_notifier_block,
280 CPUFREQ_POLICY_NOTIFIER)) {
281 acpi_processor_cpufreq_init = true;
282 acpi_processor_ignore_ppc_init();
283 }
284
285 acpi_processor_throttling_init();
286 return 0;
287err:
288 driver_unregister(&acpi_processor_driver);
289 return result;
290}
291
292static void __exit acpi_processor_driver_exit(void)
293{
294 if (acpi_disabled)
295 return;
296
297 if (acpi_processor_cpufreq_init) {
298 cpufreq_unregister_notifier(&acpi_processor_notifier_block,
299 CPUFREQ_POLICY_NOTIFIER);
300 acpi_processor_cpufreq_init = false;
301 }
302
303 cpuhp_remove_state_nocalls(hp_online);
304 cpuhp_remove_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD);
305 driver_unregister(&acpi_processor_driver);
306}
307
308module_init(acpi_processor_driver_init);
309module_exit(acpi_processor_driver_exit);
310
311MODULE_ALIAS("processor");