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1da177e4 LT |
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> | |
ae92dc9f | 13 | #include <linux/slab.h> |
1da177e4 | 14 | #include <linux/sysdev.h> |
93ad7949 | 15 | #include <linux/mutex.h> |
1da177e4 LT |
16 | |
17 | #include "op_counter.h" | |
18 | #include "op_arm_model.h" | |
19 | ||
55f05234 RK |
20 | static struct op_arm_model_spec *op_arm_model; |
21 | static int op_arm_enabled; | |
93ad7949 | 22 | static DEFINE_MUTEX(op_arm_mutex); |
1da177e4 | 23 | |
ae92dc9f | 24 | struct op_counter_config *counter_config; |
1da177e4 | 25 | |
55f05234 | 26 | static int op_arm_create_files(struct super_block *sb, struct dentry *root) |
1da177e4 LT |
27 | { |
28 | unsigned int i; | |
29 | ||
55f05234 | 30 | for (i = 0; i < op_arm_model->num_counters; i++) { |
1da177e4 | 31 | struct dentry *dir; |
ae92dc9f | 32 | char buf[4]; |
1da177e4 LT |
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 | ||
55f05234 | 47 | static int op_arm_setup(void) |
1da177e4 LT |
48 | { |
49 | int ret; | |
50 | ||
51 | spin_lock(&oprofilefs_lock); | |
55f05234 | 52 | ret = op_arm_model->setup_ctrs(); |
1da177e4 LT |
53 | spin_unlock(&oprofilefs_lock); |
54 | return ret; | |
55 | } | |
56 | ||
55f05234 | 57 | static int op_arm_start(void) |
1da177e4 LT |
58 | { |
59 | int ret = -EBUSY; | |
60 | ||
93ad7949 | 61 | mutex_lock(&op_arm_mutex); |
55f05234 RK |
62 | if (!op_arm_enabled) { |
63 | ret = op_arm_model->start(); | |
64 | op_arm_enabled = !ret; | |
1da177e4 | 65 | } |
93ad7949 | 66 | mutex_unlock(&op_arm_mutex); |
1da177e4 LT |
67 | return ret; |
68 | } | |
69 | ||
55f05234 | 70 | static void op_arm_stop(void) |
1da177e4 | 71 | { |
93ad7949 | 72 | mutex_lock(&op_arm_mutex); |
55f05234 RK |
73 | if (op_arm_enabled) |
74 | op_arm_model->stop(); | |
75 | op_arm_enabled = 0; | |
93ad7949 | 76 | mutex_unlock(&op_arm_mutex); |
1da177e4 LT |
77 | } |
78 | ||
b5893c56 | 79 | #ifdef CONFIG_PM |
55f05234 | 80 | static int op_arm_suspend(struct sys_device *dev, pm_message_t state) |
b5893c56 | 81 | { |
93ad7949 | 82 | mutex_lock(&op_arm_mutex); |
55f05234 RK |
83 | if (op_arm_enabled) |
84 | op_arm_model->stop(); | |
93ad7949 | 85 | mutex_unlock(&op_arm_mutex); |
b5893c56 RK |
86 | return 0; |
87 | } | |
88 | ||
55f05234 | 89 | static int op_arm_resume(struct sys_device *dev) |
b5893c56 | 90 | { |
93ad7949 | 91 | mutex_lock(&op_arm_mutex); |
55f05234 RK |
92 | if (op_arm_enabled && op_arm_model->start()) |
93 | op_arm_enabled = 0; | |
93ad7949 | 94 | mutex_unlock(&op_arm_mutex); |
b5893c56 RK |
95 | return 0; |
96 | } | |
97 | ||
98 | static struct sysdev_class oprofile_sysclass = { | |
99 | set_kset_name("oprofile"), | |
55f05234 RK |
100 | .resume = op_arm_resume, |
101 | .suspend = op_arm_suspend, | |
b5893c56 RK |
102 | }; |
103 | ||
104 | static struct sys_device device_oprofile = { | |
105 | .id = 0, | |
106 | .cls = &oprofile_sysclass, | |
107 | }; | |
108 | ||
109 | static 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 | ||
119 | static 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 /* CONFIG_PM */ | |
128 | ||
c6b9dafc | 129 | int __init oprofile_arch_init(struct oprofile_operations *ops) |
1da177e4 | 130 | { |
c6b9dafc RK |
131 | struct op_arm_model_spec *spec = NULL; |
132 | int ret = -ENODEV; | |
133 | ||
134 | #ifdef CONFIG_CPU_XSCALE | |
135 | spec = &op_xscale_spec; | |
136 | #endif | |
137 | ||
138 | if (spec) { | |
7610dfa3 RD |
139 | ret = spec->init(); |
140 | if (ret < 0) | |
141 | return ret; | |
c6b9dafc | 142 | |
58e9ff56 | 143 | counter_config = kcalloc(spec->num_counters, sizeof(struct op_counter_config), |
ae92dc9f RK |
144 | GFP_KERNEL); |
145 | if (!counter_config) | |
146 | return -ENOMEM; | |
147 | ||
c6b9dafc RK |
148 | op_arm_model = spec; |
149 | init_driverfs(); | |
150 | ops->create_files = op_arm_create_files; | |
151 | ops->setup = op_arm_setup; | |
152 | ops->shutdown = op_arm_stop; | |
153 | ops->start = op_arm_start; | |
154 | ops->stop = op_arm_stop; | |
155 | ops->cpu_type = op_arm_model->name; | |
156 | ops->backtrace = arm_backtrace; | |
157 | printk(KERN_INFO "oprofile: using %s\n", spec->name); | |
158 | } | |
1da177e4 | 159 | |
c6b9dafc | 160 | return ret; |
1da177e4 LT |
161 | } |
162 | ||
c6b9dafc | 163 | void oprofile_arch_exit(void) |
1da177e4 | 164 | { |
55f05234 | 165 | if (op_arm_model) { |
1da177e4 | 166 | exit_driverfs(); |
55f05234 | 167 | op_arm_model = NULL; |
1da177e4 | 168 | } |
ae92dc9f | 169 | kfree(counter_config); |
1da177e4 | 170 | } |