diff options
Diffstat (limited to 'arch/arm/oprofile/common.c')
-rw-r--r-- | arch/arm/oprofile/common.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/arch/arm/oprofile/common.c b/arch/arm/oprofile/common.c new file mode 100644 index 000000000000..e57dde882898 --- /dev/null +++ b/arch/arm/oprofile/common.c | |||
@@ -0,0 +1,156 @@ | |||
1 | /** | ||
2 | * @file common.c | ||
3 | * | ||
4 | * @remark Copyright 2004 Oprofile Authors | ||
5 | * @remark Read the file COPYING | ||
6 | * | ||
7 | * @author Zwane Mwaikambo | ||
8 | */ | ||
9 | |||
10 | #include <linux/init.h> | ||
11 | #include <linux/oprofile.h> | ||
12 | #include <linux/errno.h> | ||
13 | #include <asm/semaphore.h> | ||
14 | #include <linux/sysdev.h> | ||
15 | |||
16 | #include "op_counter.h" | ||
17 | #include "op_arm_model.h" | ||
18 | |||
19 | static struct op_arm_model_spec *pmu_model; | ||
20 | static int pmu_enabled; | ||
21 | static struct semaphore pmu_sem; | ||
22 | |||
23 | static int pmu_start(void); | ||
24 | static int pmu_setup(void); | ||
25 | static void pmu_stop(void); | ||
26 | static int pmu_create_files(struct super_block *, struct dentry *); | ||
27 | |||
28 | #ifdef CONFIG_PM | ||
29 | static int pmu_suspend(struct sys_device *dev, pm_message_t state) | ||
30 | { | ||
31 | if (pmu_enabled) | ||
32 | pmu_stop(); | ||
33 | return 0; | ||
34 | } | ||
35 | |||
36 | static int pmu_resume(struct sys_device *dev) | ||
37 | { | ||
38 | if (pmu_enabled) | ||
39 | pmu_start(); | ||
40 | return 0; | ||
41 | } | ||
42 | |||
43 | static struct sysdev_class oprofile_sysclass = { | ||
44 | set_kset_name("oprofile"), | ||
45 | .resume = pmu_resume, | ||
46 | .suspend = pmu_suspend, | ||
47 | }; | ||
48 | |||
49 | static struct sys_device device_oprofile = { | ||
50 | .id = 0, | ||
51 | .cls = &oprofile_sysclass, | ||
52 | }; | ||
53 | |||
54 | static int __init init_driverfs(void) | ||
55 | { | ||
56 | int ret; | ||
57 | |||
58 | if (!(ret = sysdev_class_register(&oprofile_sysclass))) | ||
59 | ret = sysdev_register(&device_oprofile); | ||
60 | |||
61 | return ret; | ||
62 | } | ||
63 | |||
64 | static void exit_driverfs(void) | ||
65 | { | ||
66 | sysdev_unregister(&device_oprofile); | ||
67 | sysdev_class_unregister(&oprofile_sysclass); | ||
68 | } | ||
69 | #else | ||
70 | #define init_driverfs() do { } while (0) | ||
71 | #define exit_driverfs() do { } while (0) | ||
72 | #endif /* CONFIG_PM */ | ||
73 | |||
74 | struct op_counter_config counter_config[OP_MAX_COUNTER]; | ||
75 | |||
76 | static int pmu_create_files(struct super_block *sb, struct dentry *root) | ||
77 | { | ||
78 | unsigned int i; | ||
79 | |||
80 | for (i = 0; i < pmu_model->num_counters; i++) { | ||
81 | struct dentry *dir; | ||
82 | char buf[2]; | ||
83 | |||
84 | snprintf(buf, sizeof buf, "%d", i); | ||
85 | dir = oprofilefs_mkdir(sb, root, buf); | ||
86 | oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled); | ||
87 | oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event); | ||
88 | oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count); | ||
89 | oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask); | ||
90 | oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel); | ||
91 | oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user); | ||
92 | } | ||
93 | |||
94 | return 0; | ||
95 | } | ||
96 | |||
97 | static int pmu_setup(void) | ||
98 | { | ||
99 | int ret; | ||
100 | |||
101 | spin_lock(&oprofilefs_lock); | ||
102 | ret = pmu_model->setup_ctrs(); | ||
103 | spin_unlock(&oprofilefs_lock); | ||
104 | return ret; | ||
105 | } | ||
106 | |||
107 | static int pmu_start(void) | ||
108 | { | ||
109 | int ret = -EBUSY; | ||
110 | |||
111 | down(&pmu_sem); | ||
112 | if (!pmu_enabled) { | ||
113 | ret = pmu_model->start(); | ||
114 | pmu_enabled = !ret; | ||
115 | } | ||
116 | up(&pmu_sem); | ||
117 | return ret; | ||
118 | } | ||
119 | |||
120 | static void pmu_stop(void) | ||
121 | { | ||
122 | down(&pmu_sem); | ||
123 | if (pmu_enabled) | ||
124 | pmu_model->stop(); | ||
125 | pmu_enabled = 0; | ||
126 | up(&pmu_sem); | ||
127 | } | ||
128 | |||
129 | int __init pmu_init(struct oprofile_operations *ops, struct op_arm_model_spec *spec) | ||
130 | { | ||
131 | init_MUTEX(&pmu_sem); | ||
132 | |||
133 | if (spec->init() < 0) | ||
134 | return -ENODEV; | ||
135 | |||
136 | pmu_model = spec; | ||
137 | init_driverfs(); | ||
138 | ops->create_files = pmu_create_files; | ||
139 | ops->setup = pmu_setup; | ||
140 | ops->shutdown = pmu_stop; | ||
141 | ops->start = pmu_start; | ||
142 | ops->stop = pmu_stop; | ||
143 | ops->cpu_type = pmu_model->name; | ||
144 | printk(KERN_INFO "oprofile: using %s PMU\n", spec->name); | ||
145 | |||
146 | return 0; | ||
147 | } | ||
148 | |||
149 | void pmu_exit(void) | ||
150 | { | ||
151 | if (pmu_model) { | ||
152 | exit_driverfs(); | ||
153 | pmu_model = NULL; | ||
154 | } | ||
155 | } | ||
156 | |||