windfarm_cpufreq_clamp.c
2.14 KB
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
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/cpufreq.h>
#include <asm/prom.h>
#include "windfarm.h"
#define VERSION "0.3"
static int clamped;
static struct wf_control *clamp_control;
static int clamp_notifier_call(struct notifier_block *self,
unsigned long event, void *data)
{
struct cpufreq_policy *p = data;
unsigned long max_freq;
if (event != CPUFREQ_ADJUST)
return 0;
max_freq = clamped ? (p->cpuinfo.min_freq) : (p->cpuinfo.max_freq);
cpufreq_verify_within_limits(p, 0, max_freq);
return 0;
}
static struct notifier_block clamp_notifier = {
.notifier_call = clamp_notifier_call,
};
static int clamp_set(struct wf_control *ct, s32 value)
{
if (value)
printk(KERN_INFO "windfarm: Clamping CPU frequency to "
"minimum !\n");
else
printk(KERN_INFO "windfarm: CPU frequency unclamped !\n");
clamped = value;
cpufreq_update_policy(0);
return 0;
}
static int clamp_get(struct wf_control *ct, s32 *value)
{
*value = clamped;
return 0;
}
static s32 clamp_min(struct wf_control *ct)
{
return 0;
}
static s32 clamp_max(struct wf_control *ct)
{
return 1;
}
static struct wf_control_ops clamp_ops = {
.set_value = clamp_set,
.get_value = clamp_get,
.get_min = clamp_min,
.get_max = clamp_max,
.owner = THIS_MODULE,
};
static int __init wf_cpufreq_clamp_init(void)
{
struct wf_control *clamp;
clamp = kmalloc(sizeof(struct wf_control), GFP_KERNEL);
if (clamp == NULL)
return -ENOMEM;
cpufreq_register_notifier(&clamp_notifier, CPUFREQ_POLICY_NOTIFIER);
clamp->ops = &clamp_ops;
clamp->name = "cpufreq-clamp";
if (wf_register_control(clamp))
goto fail;
clamp_control = clamp;
return 0;
fail:
kfree(clamp);
return -ENODEV;
}
static void __exit wf_cpufreq_clamp_exit(void)
{
if (clamp_control)
wf_unregister_control(clamp_control);
}
module_init(wf_cpufreq_clamp_init);
module_exit(wf_cpufreq_clamp_exit);
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("CPU frequency clamp for PowerMacs thermal control");
MODULE_LICENSE("GPL");