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10#include <linux/init.h>
11#include <linux/oprofile.h>
12#include <linux/errno.h>
13#include <linux/slab.h>
14#include <linux/sysdev.h>
15#include <linux/mutex.h>
16
17#include "op_counter.h"
18#include "op_arm_model.h"
19
20static struct op_arm_model_spec *op_arm_model;
21static int op_arm_enabled;
22static DEFINE_MUTEX(op_arm_mutex);
23
24struct op_counter_config *counter_config;
25
26static int op_arm_create_files(struct super_block *sb, struct dentry *root)
27{
28 unsigned int i;
29
30 for (i = 0; i < op_arm_model->num_counters; i++) {
31 struct dentry *dir;
32 char buf[4];
33
34 snprintf(buf, sizeof buf, "%d", i);
35 dir = oprofilefs_mkdir(sb, root, buf);
36 oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
37 oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
38 oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
39 oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
40 oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
41 oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
42 }
43
44 return 0;
45}
46
47static int op_arm_setup(void)
48{
49 int ret;
50
51 spin_lock(&oprofilefs_lock);
52 ret = op_arm_model->setup_ctrs();
53 spin_unlock(&oprofilefs_lock);
54 return ret;
55}
56
57static int op_arm_start(void)
58{
59 int ret = -EBUSY;
60
61 mutex_lock(&op_arm_mutex);
62 if (!op_arm_enabled) {
63 ret = op_arm_model->start();
64 op_arm_enabled = !ret;
65 }
66 mutex_unlock(&op_arm_mutex);
67 return ret;
68}
69
70static void op_arm_stop(void)
71{
72 mutex_lock(&op_arm_mutex);
73 if (op_arm_enabled)
74 op_arm_model->stop();
75 op_arm_enabled = 0;
76 mutex_unlock(&op_arm_mutex);
77}
78
79#ifdef CONFIG_PM
80static int op_arm_suspend(struct sys_device *dev, pm_message_t state)
81{
82 mutex_lock(&op_arm_mutex);
83 if (op_arm_enabled)
84 op_arm_model->stop();
85 mutex_unlock(&op_arm_mutex);
86 return 0;
87}
88
89static int op_arm_resume(struct sys_device *dev)
90{
91 mutex_lock(&op_arm_mutex);
92 if (op_arm_enabled && op_arm_model->start())
93 op_arm_enabled = 0;
94 mutex_unlock(&op_arm_mutex);
95 return 0;
96}
97
98static struct sysdev_class oprofile_sysclass = {
99 .name = "oprofile",
100 .resume = op_arm_resume,
101 .suspend = op_arm_suspend,
102};
103
104static struct sys_device device_oprofile = {
105 .id = 0,
106 .cls = &oprofile_sysclass,
107};
108
109static int __init init_driverfs(void)
110{
111 int ret;
112
113 if (!(ret = sysdev_class_register(&oprofile_sysclass)))
114 ret = sysdev_register(&device_oprofile);
115
116 return ret;
117}
118
119static void exit_driverfs(void)
120{
121 sysdev_unregister(&device_oprofile);
122 sysdev_class_unregister(&oprofile_sysclass);
123}
124#else
125#define init_driverfs() do { } while (0)
126#define exit_driverfs() do { } while (0)
127#endif
128
129int __init oprofile_arch_init(struct oprofile_operations *ops)
130{
131 struct op_arm_model_spec *spec = NULL;
132 int ret = -ENODEV;
133
134 ops->backtrace = arm_backtrace;
135
136#ifdef CONFIG_CPU_XSCALE
137 spec = &op_xscale_spec;
138#endif
139
140#ifdef CONFIG_OPROFILE_ARMV6
141 spec = &op_armv6_spec;
142#endif
143
144#ifdef CONFIG_OPROFILE_MPCORE
145 spec = &op_mpcore_spec;
146#endif
147
148#ifdef CONFIG_OPROFILE_ARMV7
149 spec = &op_armv7_spec;
150#endif
151
152 if (spec) {
153 ret = spec->init();
154 if (ret < 0)
155 return ret;
156
157 counter_config = kcalloc(spec->num_counters, sizeof(struct op_counter_config),
158 GFP_KERNEL);
159 if (!counter_config)
160 return -ENOMEM;
161
162 op_arm_model = spec;
163 init_driverfs();
164 ops->create_files = op_arm_create_files;
165 ops->setup = op_arm_setup;
166 ops->shutdown = op_arm_stop;
167 ops->start = op_arm_start;
168 ops->stop = op_arm_stop;
169 ops->cpu_type = op_arm_model->name;
170 printk(KERN_INFO "oprofile: using %s\n", spec->name);
171 }
172
173 return ret;
174}
175
176void oprofile_arch_exit(void)
177{
178 if (op_arm_model) {
179 exit_driverfs();
180 op_arm_model = NULL;
181 }
182 kfree(counter_config);
183}
184
