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
|
/**
* @file common.c
*
* @remark Copyright 2004 Oprofile Authors
* @remark Read the file COPYING
*
* @author Zwane Mwaikambo
*/
#include <linux/init.h>
#include <linux/oprofile.h>
#include <linux/errno.h>
#include <linux/sysdev.h>
#include <asm/semaphore.h>
#include "op_counter.h"
#include "op_arm_model.h"
static struct op_arm_model_spec *pmu_model;
static int pmu_enabled;
static struct semaphore pmu_sem;
struct op_counter_config counter_config[OP_MAX_COUNTER];
static int pmu_create_files(struct super_block *sb, struct dentry *root)
{
unsigned int i;
for (i = 0; i < pmu_model->num_counters; i++) {
struct dentry *dir;
char buf[2];
snprintf(buf, sizeof buf, "%d", i);
dir = oprofilefs_mkdir(sb, root, buf);
oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
}
return 0;
}
static int pmu_setup(void)
{
int ret;
spin_lock(&oprofilefs_lock);
ret = pmu_model->setup_ctrs();
spin_unlock(&oprofilefs_lock);
return ret;
}
static int pmu_start(void)
{
int ret = -EBUSY;
down(&pmu_sem);
if (!pmu_enabled) {
ret = pmu_model->start();
pmu_enabled = !ret;
}
up(&pmu_sem);
return ret;
}
static void pmu_stop(void)
{
down(&pmu_sem);
if (pmu_enabled)
pmu_model->stop();
pmu_enabled = 0;
up(&pmu_sem);
}
#ifdef CONFIG_PM
static int pmu_suspend(struct sys_device *dev, pm_message_t state)
{
if (pmu_enabled)
pmu_stop();
return 0;
}
static int pmu_resume(struct sys_device *dev)
{
if (pmu_enabled)
pmu_start();
return 0;
}
static struct sysdev_class oprofile_sysclass = {
set_kset_name("oprofile"),
.resume = pmu_resume,
.suspend = pmu_suspend,
};
static struct sys_device device_oprofile = {
.id = 0,
.cls = &oprofile_sysclass,
};
static int __init init_driverfs(void)
{
int ret;
if (!(ret = sysdev_class_register(&oprofile_sysclass)))
ret = sysdev_register(&device_oprofile);
return ret;
}
static void exit_driverfs(void)
{
sysdev_unregister(&device_oprofile);
sysdev_class_unregister(&oprofile_sysclass);
}
#else
#define init_driverfs() do { } while (0)
#define exit_driverfs() do { } while (0)
#endif /* CONFIG_PM */
int __init pmu_init(struct oprofile_operations *ops, struct op_arm_model_spec *spec)
{
init_MUTEX(&pmu_sem);
if (spec->init() < 0)
return -ENODEV;
pmu_model = spec;
init_driverfs();
ops->create_files = pmu_create_files;
ops->setup = pmu_setup;
ops->shutdown = pmu_stop;
ops->start = pmu_start;
ops->stop = pmu_stop;
ops->cpu_type = pmu_model->name;
printk(KERN_INFO "oprofile: using %s PMU\n", spec->name);
return 0;
}
void pmu_exit(void)
{
if (pmu_model) {
exit_driverfs();
pmu_model = NULL;
}
}
|
