1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
From 97abcfc5219149ff7d4883b295c80257f0315b5e Mon Sep 17 00:00:00 2001
From: Anson Huang <Anson.Huang@nxp.com>
Date: Wed, 7 Aug 2019 08:40:59 +0800
Subject: [PATCH] thermal: Add generic device cooling support
To compatible with previous implementation, add generic device
cooling support, each thermal zone will register a cooling
device, and when temperature exceed passive trip, the device
cooling driver will send out a system wide notification, each
device supporting cooling will need to register device cooling
and takes action when passive trip is exceeded;
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
[rebase]
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
---
drivers/thermal/Kconfig | 7 ++
drivers/thermal/Makefile | 1 +
drivers/thermal/device_cooling.c | 152 +++++++++++++++++++++++++++++++++++++++
include/linux/device_cooling.h | 45 ++++++++++++
4 files changed, 205 insertions(+)
create mode 100644 drivers/thermal/device_cooling.c
create mode 100644 include/linux/device_cooling.h
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -233,6 +233,13 @@ config IMX_THERMAL
cpufreq is used as the cooling device to throttle CPUs when the
passive trip is crossed.
+config DEVICE_THERMAL
+ tristate "generic device cooling support"
+ help
+ Support for device cooling.
+ It supports notification of crossing passive trip for devices,
+ devices need to do their own actions to cool down the SOC.
+
config MAX77620_THERMAL
tristate "Temperature sensor driver for Maxim MAX77620 PMIC"
depends on MFD_MAX77620
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_DB8500_THERMAL) += db8500_t
obj-$(CONFIG_ARMADA_THERMAL) += armada_thermal.o
obj-$(CONFIG_TANGO_THERMAL) += tango_thermal.o
obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
+obj-$(CONFIG_DEVICE_THERMAL) += device_cooling.o
obj-$(CONFIG_MAX77620_THERMAL) += max77620_thermal.o
obj-$(CONFIG_QORIQ_THERMAL) += qoriq_thermal.o
obj-$(CONFIG_DA9062_THERMAL) += da9062-thermal.o
--- /dev/null
+++ b/drivers/thermal/device_cooling.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2013-2015 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/thermal.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+struct devfreq_cooling_device {
+ int id;
+ struct thermal_cooling_device *cool_dev;
+ unsigned int devfreq_state;
+};
+
+static DEFINE_IDR(devfreq_idr);
+static DEFINE_MUTEX(devfreq_cooling_lock);
+
+#define MAX_STATE 1
+
+static BLOCKING_NOTIFIER_HEAD(devfreq_cooling_chain_head);
+
+int register_devfreq_cooling_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(
+ &devfreq_cooling_chain_head, nb);
+}
+EXPORT_SYMBOL_GPL(register_devfreq_cooling_notifier);
+
+int unregister_devfreq_cooling_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(
+ &devfreq_cooling_chain_head, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_devfreq_cooling_notifier);
+
+static int devfreq_cooling_notifier_call_chain(unsigned long val)
+{
+ return (blocking_notifier_call_chain(
+ &devfreq_cooling_chain_head, val, NULL)
+ == NOTIFY_BAD) ? -EINVAL : 0;
+}
+
+static int devfreq_set_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long state)
+{
+ struct devfreq_cooling_device *devfreq_device = cdev->devdata;
+ int ret;
+
+ ret = devfreq_cooling_notifier_call_chain(state);
+ if (ret)
+ return -EINVAL;
+
+ devfreq_device->devfreq_state = state;
+
+ return 0;
+}
+
+static int devfreq_get_max_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ *state = MAX_STATE;
+
+ return 0;
+}
+
+static int devfreq_get_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ struct devfreq_cooling_device *devfreq_device = cdev->devdata;
+
+ *state = devfreq_device->devfreq_state;
+
+ return 0;
+}
+
+static struct thermal_cooling_device_ops const devfreq_cooling_ops = {
+ .get_max_state = devfreq_get_max_state,
+ .get_cur_state = devfreq_get_cur_state,
+ .set_cur_state = devfreq_set_cur_state,
+};
+
+static int get_idr(struct idr *idr, int *id)
+{
+ int ret;
+
+ mutex_lock(&devfreq_cooling_lock);
+ ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
+ mutex_unlock(&devfreq_cooling_lock);
+ if (unlikely(ret < 0))
+ return ret;
+ *id = ret;
+
+ return 0;
+}
+
+static void release_idr(struct idr *idr, int id)
+{
+ mutex_lock(&devfreq_cooling_lock);
+ idr_remove(idr, id);
+ mutex_unlock(&devfreq_cooling_lock);
+}
+
+struct thermal_cooling_device *devfreq_cooling_register(void)
+{
+ struct thermal_cooling_device *cool_dev;
+ struct devfreq_cooling_device *devfreq_dev = NULL;
+ char dev_name[THERMAL_NAME_LENGTH];
+ int ret = 0;
+
+ devfreq_dev = kzalloc(sizeof(struct devfreq_cooling_device),
+ GFP_KERNEL);
+ if (!devfreq_dev)
+ return ERR_PTR(-ENOMEM);
+
+ ret = get_idr(&devfreq_idr, &devfreq_dev->id);
+ if (ret) {
+ kfree(devfreq_dev);
+ return ERR_PTR(-EINVAL);
+ }
+
+ snprintf(dev_name, sizeof(dev_name), "thermal-devfreq-%d",
+ devfreq_dev->id);
+
+ cool_dev = thermal_cooling_device_register(dev_name, devfreq_dev,
+ &devfreq_cooling_ops);
+ if (!cool_dev) {
+ release_idr(&devfreq_idr, devfreq_dev->id);
+ kfree(devfreq_dev);
+ return ERR_PTR(-EINVAL);
+ }
+ devfreq_dev->cool_dev = cool_dev;
+ devfreq_dev->devfreq_state = 0;
+
+ return cool_dev;
+}
+EXPORT_SYMBOL_GPL(devfreq_cooling_register);
+
+void devfreq_cooling_unregister(struct thermal_cooling_device *cdev)
+{
+ struct devfreq_cooling_device *devfreq_dev = cdev->devdata;
+
+ thermal_cooling_device_unregister(devfreq_dev->cool_dev);
+ release_idr(&devfreq_idr, devfreq_dev->id);
+ kfree(devfreq_dev);
+}
+EXPORT_SYMBOL_GPL(devfreq_cooling_unregister);
--- /dev/null
+++ b/include/linux/device_cooling.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2013-2015 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef __DEVICE_THERMAL_H__
+#define __DEVICE_THERMAL_H__
+
+#include <linux/thermal.h>
+
+#ifdef CONFIG_DEVICE_THERMAL
+int register_devfreq_cooling_notifier(struct notifier_block *nb);
+int unregister_devfreq_cooling_notifier(struct notifier_block *nb);
+struct thermal_cooling_device *devfreq_cooling_register(void);
+void devfreq_cooling_unregister(struct thermal_cooling_device *cdev);
+#else
+static inline
+int register_devfreq_cooling_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+
+static inline
+int unregister_devfreq_cooling_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+
+static inline
+struct thermal_cooling_device *devfreq_cooling_register(void)
+{
+ return NULL;
+}
+
+static inline
+void devfreq_cooling_unregister(struct thermal_cooling_device *cdev)
+{
+ return;
+}
+#endif
+#endif /* __DEVICE_THERMAL_H__ */
|
