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
|
/* linux/arch/arm/mach-exynos/dynamic-nr_running-hotplug.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* EXYNOS - nr_running based dynamic CPU hotplug
*
* 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/sched.h>
#include <linux/cpufreq.h>
#include <linux/cpu.h>
#include <linux/err.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/suspend.h>
#include <plat/cpu.h>
static unsigned int total_num_target_freq;
static unsigned int ctn_highestlevel_cnt; /* continuous the highest level count */
static unsigned int ctn_lowestlevel_cnt;
static unsigned int ctn_nr_running_over2;
static unsigned int ctn_nr_running_over3;
static unsigned int ctn_nr_running_over4;
static unsigned int ctn_nr_running_under2;
static unsigned int ctn_nr_running_under3;
static unsigned int ctn_nr_running_under4;
static unsigned int freq_max;
static unsigned int freq_in_trg;
static unsigned int freq_min;
static unsigned int can_hotplug;
static void exynos4_integrated_dvfs_hotplug(unsigned int freq_old,
unsigned int freq_new)
{
total_num_target_freq++;
freq_in_trg = 800000;
if (nr_running() <= 1) {
ctn_nr_running_over2 = 0;
ctn_nr_running_over3 = 0;
ctn_nr_running_over4 = 0;
ctn_nr_running_under2++;
ctn_nr_running_under3++;
ctn_nr_running_under4++;
} else if ((nr_running() > 1) && (nr_running() <= 2)) {
ctn_nr_running_over2++;
ctn_nr_running_over3 = 0;
ctn_nr_running_over4 = 0;
ctn_nr_running_under2 = 0;
ctn_nr_running_under3++;
ctn_nr_running_under4++;
} else if ((nr_running() > 2) && (nr_running() <= 3)) {
ctn_nr_running_over2++;
ctn_nr_running_over3++;
ctn_nr_running_over4 = 0;
ctn_nr_running_under2 = 0;
ctn_nr_running_under3 = 0;
ctn_nr_running_under4++;
} else if (nr_running() > 3) {
ctn_nr_running_over2++;
ctn_nr_running_over3++;
ctn_nr_running_over4++;
ctn_nr_running_under2 = 0;
ctn_nr_running_under3 = 0;
ctn_nr_running_under4 = 0;
}
if (soc_is_exynos4412()) {
if ((cpu_online(3) == 0) && (nr_running() >= 2)) {
if (ctn_nr_running_over2 >= 4) { /* over 400ms, tunnable */
cpu_up(3);
}
} else if ((cpu_online(2) == 0) && (nr_running() >= 3)) {
if (ctn_nr_running_over3 >= 4) { /* over 400ms, tunnable */
cpu_up(2);
}
} else if ((cpu_online(1) == 0) && (nr_running() >= 4)) {
if (ctn_nr_running_over4 >= 8) { /* over 800ms, tunnable */
cpu_up(1);
}
}
} else {
if (cpu_online(1) == 0) {
if (ctn_nr_running_over2 >= 8) { /* over 800ms, tunnable */
cpu_up(1);
ctn_nr_running_over2 = 0;
}
}
} /* end of else */
if (soc_is_exynos4412()) {
if ((cpu_online(1) == 1) && (nr_running() < 4)) {
if (ctn_nr_running_under4 >= 8) { /* over 800ms, tunnable */
cpu_down(1);
}
} else if ((cpu_online(2) == 1) && (nr_running() < 3)) {
if (ctn_nr_running_under3 >= 8) { /* over 800ms, tunnable */
cpu_down(2);
}
} else if ((cpu_online(3) == 1) && (nr_running() < 2)) {
if (ctn_nr_running_under2 >= 8) { /* over 800ms, tunnable */
cpu_down(3);
}
}
} else {
if (cpu_online(1) == 1) {
if (ctn_nr_running_under2 >= 8) { /* over 800ms, tunnable */
cpu_down(1);
ctn_nr_running_under2 = 0;
}
}
} /* end of else */
}
static int hotplug_cpufreq_transition(struct notifier_block *nb,
unsigned long val, void *data)
{
struct cpufreq_freqs *freqs = (struct cpufreq_freqs *)data;
if ((val == CPUFREQ_POSTCHANGE) && can_hotplug)
exynos4_integrated_dvfs_hotplug(freqs->old, freqs->new);
return 0;
}
static struct notifier_block dvfs_hotplug = {
.notifier_call = hotplug_cpufreq_transition,
};
static int hotplug_pm_transition(struct notifier_block *nb,
unsigned long val, void *data)
{
switch (val) {
case PM_SUSPEND_PREPARE:
can_hotplug = 0;
ctn_highestlevel_cnt = 0;
ctn_lowestlevel_cnt = 0;
break;
case PM_POST_RESTORE:
case PM_POST_SUSPEND:
can_hotplug = 1;
break;
}
return 0;
}
static struct notifier_block pm_hotplug = {
.notifier_call = hotplug_pm_transition,
};
/*
* Note : This function should be called after intialization of CPUFreq
* driver for exynos4. The cpufreq_frequency_table for exynos4 should be
* established before calling this function.
*/
static int __init exynos4_integrated_dvfs_hotplug_init(void)
{
int i;
struct cpufreq_frequency_table *table;
unsigned int freq;
total_num_target_freq = 0;
ctn_highestlevel_cnt = 0;
ctn_lowestlevel_cnt = 0;
ctn_nr_running_over2 = 0;
ctn_nr_running_over3 = 0;
ctn_nr_running_over4 = 0;
ctn_nr_running_under2 = 0;
ctn_nr_running_under3 = 0;
ctn_nr_running_under4 = 0;
can_hotplug = 1;
table = cpufreq_frequency_get_table(0);
if (IS_ERR(table)) {
printk(KERN_ERR "%s: Check loading cpufreq before\n", __func__);
return PTR_ERR(table);
}
for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
freq = table[i].frequency;
if (freq != CPUFREQ_ENTRY_INVALID && freq > freq_max)
freq_max = freq;
else if (freq != CPUFREQ_ENTRY_INVALID && freq_min > freq)
freq_min = freq;
}
register_pm_notifier(&pm_hotplug);
return cpufreq_register_notifier(&dvfs_hotplug,
CPUFREQ_TRANSITION_NOTIFIER);
}
late_initcall(exynos4_integrated_dvfs_hotplug_init);
|
