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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
31#define _COMPONENT ACPI_PROCESSOR_COMPONENT
32ACPI_MODULE_NAME("processor_driver");
33
34MODULE_AUTHOR("Paul Diefenbaugh");
35MODULE_DESCRIPTION("ACPI Processor Driver");
36MODULE_LICENSE("GPL");
37
38static int acpi_processor_start(struct device *dev);
39static int acpi_processor_stop(struct device *dev);
40
41static const struct acpi_device_id processor_device_ids[] = {
42 {ACPI_PROCESSOR_OBJECT_HID, 0},
43 {ACPI_PROCESSOR_DEVICE_HID, 0},
44 {"", 0},
45};
46MODULE_DEVICE_TABLE(acpi, processor_device_ids);
47
48static struct device_driver acpi_processor_driver = {
49 .name = "processor",
50 .bus = &cpu_subsys,
51 .acpi_match_table = processor_device_ids,
52 .probe = acpi_processor_start,
53 .remove = acpi_processor_stop,
54};
55
56static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
57{
58 struct acpi_device *device = data;
59 struct acpi_processor *pr;
60 int saved;
61
62 if (device->handle != handle)
63 return;
64
65 pr = acpi_driver_data(device);
66 if (!pr)
67 return;
68
69 switch (event) {
70 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
71 saved = pr->performance_platform_limit;
72 acpi_processor_ppc_has_changed(pr, 1);
73 if (saved == pr->performance_platform_limit)
74 break;
75 acpi_bus_generate_netlink_event(device->pnp.device_class,
76 dev_name(&device->dev), event,
77 pr->performance_platform_limit);
78 break;
79 case ACPI_PROCESSOR_NOTIFY_POWER:
80 acpi_processor_power_state_has_changed(pr);
81 acpi_bus_generate_netlink_event(device->pnp.device_class,
82 dev_name(&device->dev), event, 0);
83 break;
84 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
85 acpi_processor_tstate_has_changed(pr);
86 acpi_bus_generate_netlink_event(device->pnp.device_class,
87 dev_name(&device->dev), event, 0);
88 break;
89 default:
90 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
91 "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 || acpi_bus_get_device(pr->handle, &device))
106 return 0;
107 /*
108 * CPU got physically hotplugged and onlined for the first time:
109 * Initialize missing things.
110 */
111 if (pr->flags.need_hotplug_init) {
112 int ret;
113
114 pr_info("Will online and init hotplugged CPU: %d\n",
115 pr->id);
116 pr->flags.need_hotplug_init = 0;
117 ret = __acpi_processor_start(device);
118 WARN(ret, "Failed to start CPU: %d\n", pr->id);
119 } else {
120 /* Normal CPU soft online event. */
121 acpi_processor_ppc_has_changed(pr, 0);
122 acpi_processor_hotplug(pr);
123 acpi_processor_reevaluate_tstate(pr, false);
124 acpi_processor_tstate_has_changed(pr);
125 }
126 return 0;
127}
128
129static int acpi_soft_cpu_dead(unsigned int cpu)
130{
131 struct acpi_processor *pr = per_cpu(processors, cpu);
132 struct acpi_device *device;
133
134 if (!pr || acpi_bus_get_device(pr->handle, &device))
135 return 0;
136
137 acpi_processor_reevaluate_tstate(pr, true);
138 return 0;
139}
140
141#ifdef CONFIG_ACPI_CPU_FREQ_PSS
142static int acpi_pss_perf_init(struct acpi_processor *pr,
143 struct acpi_device *device)
144{
145 int result = 0;
146
147 acpi_processor_ppc_has_changed(pr, 0);
148
149 acpi_processor_get_throttling_info(pr);
150
151 if (pr->flags.throttling)
152 pr->flags.limit = 1;
153
154 pr->cdev = thermal_cooling_device_register("Processor", device,
155 &processor_cooling_ops);
156 if (IS_ERR(pr->cdev)) {
157 result = PTR_ERR(pr->cdev);
158 return result;
159 }
160
161 dev_dbg(&device->dev, "registered as cooling_device%d\n",
162 pr->cdev->id);
163
164 result = sysfs_create_link(&device->dev.kobj,
165 &pr->cdev->device.kobj,
166 "thermal_cooling");
167 if (result) {
168 dev_err(&device->dev,
169 "Failed to create sysfs link 'thermal_cooling'\n");
170 goto err_thermal_unregister;
171 }
172
173 result = sysfs_create_link(&pr->cdev->device.kobj,
174 &device->dev.kobj,
175 "device");
176 if (result) {
177 dev_err(&pr->cdev->device,
178 "Failed to create sysfs link 'device'\n");
179 goto err_remove_sysfs_thermal;
180 }
181
182 return 0;
183
184 err_remove_sysfs_thermal:
185 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
186 err_thermal_unregister:
187 thermal_cooling_device_unregister(pr->cdev);
188
189 return result;
190}
191
192static void acpi_pss_perf_exit(struct acpi_processor *pr,
193 struct acpi_device *device)
194{
195 if (pr->cdev) {
196 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
197 sysfs_remove_link(&pr->cdev->device.kobj, "device");
198 thermal_cooling_device_unregister(pr->cdev);
199 pr->cdev = NULL;
200 }
201}
202#else
203static inline int acpi_pss_perf_init(struct acpi_processor *pr,
204 struct acpi_device *device)
205{
206 return 0;
207}
208
209static inline void acpi_pss_perf_exit(struct acpi_processor *pr,
210 struct acpi_device *device) {}
211#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
212
213static int __acpi_processor_start(struct acpi_device *device)
214{
215 struct acpi_processor *pr = acpi_driver_data(device);
216 acpi_status status;
217 int result = 0;
218
219 if (!pr)
220 return -ENODEV;
221
222 if (pr->flags.need_hotplug_init)
223 return 0;
224
225 result = acpi_cppc_processor_probe(pr);
226 if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS))
227 dev_dbg(&device->dev, "CPPC data invalid or not present\n");
228
229 if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
230 acpi_processor_power_init(pr);
231
232 result = acpi_pss_perf_init(pr, device);
233 if (result)
234 goto err_power_exit;
235
236 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
237 acpi_processor_notify, device);
238 if (ACPI_SUCCESS(status))
239 return 0;
240
241 result = -ENODEV;
242 acpi_pss_perf_exit(pr, device);
243
244err_power_exit:
245 acpi_processor_power_exit(pr);
246 return result;
247}
248
249static int acpi_processor_start(struct device *dev)
250{
251 struct acpi_device *device = ACPI_COMPANION(dev);
252 int ret;
253
254 if (!device)
255 return -ENODEV;
256
257 /* Protect against concurrent CPU hotplug operations */
258 cpu_hotplug_disable();
259 ret = __acpi_processor_start(device);
260 cpu_hotplug_enable();
261 return ret;
262}
263
264static int acpi_processor_stop(struct device *dev)
265{
266 struct acpi_device *device = ACPI_COMPANION(dev);
267 struct acpi_processor *pr;
268
269 if (!device)
270 return 0;
271
272 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
273 acpi_processor_notify);
274
275 pr = acpi_driver_data(device);
276 if (!pr)
277 return 0;
278 acpi_processor_power_exit(pr);
279
280 acpi_pss_perf_exit(pr, device);
281
282 acpi_cppc_processor_exit(pr);
283
284 return 0;
285}
286
287bool acpi_processor_cpufreq_init;
288
289static int acpi_processor_notifier(struct notifier_block *nb,
290 unsigned long event, void *data)
291{
292 struct cpufreq_policy *policy = data;
293
294 if (event == CPUFREQ_CREATE_POLICY) {
295 acpi_thermal_cpufreq_init(policy);
296 acpi_processor_ppc_init(policy);
297 } else if (event == CPUFREQ_REMOVE_POLICY) {
298 acpi_processor_ppc_exit(policy);
299 acpi_thermal_cpufreq_exit(policy);
300 }
301
302 return 0;
303}
304
305static struct notifier_block acpi_processor_notifier_block = {
306 .notifier_call = acpi_processor_notifier,
307};
308
309/*
310 * We keep the driver loaded even when ACPI is not running.
311 * This is needed for the powernow-k8 driver, that works even without
312 * ACPI, but needs symbols from this driver
313 */
314static enum cpuhp_state hp_online;
315static int __init acpi_processor_driver_init(void)
316{
317 int result = 0;
318
319 if (acpi_disabled)
320 return 0;
321
322 result = driver_register(&acpi_processor_driver);
323 if (result < 0)
324 return result;
325
326 result = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
327 "acpi/cpu-drv:online",
328 acpi_soft_cpu_online, NULL);
329 if (result < 0)
330 goto err;
331 hp_online = result;
332 cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead",
333 NULL, acpi_soft_cpu_dead);
334
335 if (!cpufreq_register_notifier(&acpi_processor_notifier_block,
336 CPUFREQ_POLICY_NOTIFIER)) {
337 acpi_processor_cpufreq_init = true;
338 acpi_processor_ignore_ppc_init();
339 }
340
341 acpi_processor_throttling_init();
342 return 0;
343err:
344 driver_unregister(&acpi_processor_driver);
345 return result;
346}
347
348static void __exit acpi_processor_driver_exit(void)
349{
350 if (acpi_disabled)
351 return;
352
353 if (acpi_processor_cpufreq_init) {
354 cpufreq_unregister_notifier(&acpi_processor_notifier_block,
355 CPUFREQ_POLICY_NOTIFIER);
356 acpi_processor_cpufreq_init = false;
357 }
358
359 cpuhp_remove_state_nocalls(hp_online);
360 cpuhp_remove_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD);
361 driver_unregister(&acpi_processor_driver);
362}
363
364module_init(acpi_processor_driver_init);
365module_exit(acpi_processor_driver_exit);
366
367MODULE_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 if (!cpufreq_register_notifier(&acpi_processor_notifier_block,
267 CPUFREQ_POLICY_NOTIFIER)) {
268 acpi_processor_cpufreq_init = true;
269 acpi_processor_ignore_ppc_init();
270 }
271
272 result = driver_register(&acpi_processor_driver);
273 if (result < 0)
274 return result;
275
276 result = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
277 "acpi/cpu-drv:online",
278 acpi_soft_cpu_online, NULL);
279 if (result < 0)
280 goto err;
281 hp_online = result;
282 cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead",
283 NULL, acpi_soft_cpu_dead);
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");