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40652b65 MD |
1 | /* |
2 | * probes/lttng-types.c | |
3 | * | |
4 | * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * LTTng types. | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/seq_file.h> | |
12 | #include <linux/jbd.h> /* tid_t */ | |
13 | #include <linux/debugfs.h> | |
14 | #include "lttng-types.h" | |
15 | ||
16 | struct dentry *lttng_types_dentry; | |
17 | ||
1d12cebd MD |
18 | #undef ENTRY |
19 | #define ENTRY(name) [atype_##name] = #name | |
40652b65 MD |
20 | |
21 | const char * const astract_types[NR_ABSTRACT_TYPES] = { | |
1d12cebd MD |
22 | ENTRY(integer), |
23 | ENTRY(enum), | |
24 | ENTRY(array), | |
25 | ENTRY(sequence), | |
26 | ENTRY(string), | |
27 | }; | |
28 | ||
29 | #undef ENTRY | |
30 | #define ENTRY(name) [lttng_encode_##name] = #name | |
31 | ||
32 | const char * const string_encodings[NR_STRING_ENCODINGS] = { | |
33 | ENTRY(UTF8), | |
34 | ENTRY(ASCII), | |
40652b65 MD |
35 | }; |
36 | ||
37 | #define STAGE_EXPORT_ENUMS | |
38 | #include "lttng-types.h" | |
39 | #include "lttng-type-list.h" | |
40 | #undef STAGE_EXPORT_ENUMS | |
41 | ||
42 | struct lttng_type lttng_types[] = { | |
43 | #define STAGE_EXPORT_TYPES | |
44 | #include "lttng-types.h" | |
45 | #include "lttng-type-list.h" | |
46 | #undef STAGE_EXPORT_TYPES | |
47 | }; | |
48 | ||
49 | static void print_enum(struct seq_file *m, const struct lttng_enum *lttng_enum) | |
50 | { | |
51 | int i; | |
52 | ||
53 | for (i = 0; i < lttng_enum->len; i++) { | |
54 | if (lttng_enum->entries[i].start == lttng_enum->entries[i].end) | |
55 | seq_printf(m, "\t\t{ %llu, %s },\n", | |
56 | lttng_enum->entries[i].start, | |
57 | lttng_enum->entries[i].string); | |
58 | else | |
59 | seq_printf(m, "\t\t{ { %llu, %llu }, %s },\n", | |
60 | lttng_enum->entries[i].start, | |
61 | lttng_enum->entries[i].end, | |
62 | lttng_enum->entries[i].string); | |
63 | } | |
64 | } | |
65 | ||
66 | static void print_event_type(struct seq_file *m, const struct lttng_type *type) | |
67 | { | |
68 | switch(type->atype) { | |
69 | case atype_integer: | |
70 | seq_printf(m, "type %s {\n" | |
71 | "\tparent = %s;\n" | |
72 | "\tsize = %u;\n" | |
73 | "\tsigned = %u;\n" | |
1d12cebd MD |
74 | "\talign = %u;\n", |
75 | type->name, | |
40652b65 MD |
76 | astract_types[type->atype], |
77 | type->u.integer.size, | |
78 | type->u.integer.signedness, | |
79 | type->u.integer.alignment); | |
1d12cebd MD |
80 | if (type->u.integer.reverse_byte_order) |
81 | seq_printf(m, "\tbyte_order = %s;\n", | |
82 | (__BYTE_ORDER == __LITTLE_ENDIAN) ? | |
83 | "be" : "le"); | |
84 | seq_printf(m, "};\n"); | |
40652b65 MD |
85 | break; |
86 | case atype_enum: | |
87 | seq_printf(m, "type %s {\n" | |
88 | "\tparent = %s;\n" | |
89 | "\tparent.parent = %s;\n" | |
90 | "\tmap = {\n", | |
91 | type->name, | |
92 | astract_types[type->atype], | |
93 | type->u.enumeration.parent_type); | |
94 | print_enum(m, &type->u.enumeration.def); | |
95 | seq_printf(m, "\t};\n" | |
96 | "};\n"); | |
97 | break; | |
98 | case atype_array: | |
99 | seq_printf(m, "type %s {\n" | |
100 | "\tparent = %s;\n" | |
101 | "\telem_type = %s;\n" | |
102 | "\tlength = %u;\n" | |
103 | "};\n", type->name, | |
104 | astract_types[type->atype], | |
105 | type->u.array.elem_type, | |
106 | type->u.array.length); | |
107 | break; | |
1d12cebd MD |
108 | case atype_sequence: |
109 | seq_printf(m, "type %s {\n" | |
110 | "\tparent = %s;\n" | |
111 | "\telem_type = %s;\n" | |
112 | "\tlength_type = %s;\n" | |
113 | "};\n", type->name, | |
114 | astract_types[type->atype], | |
115 | type->u.sequence.elem_type, | |
116 | type->u.sequence.length_type); | |
117 | break; | |
118 | case atype_string: | |
119 | seq_printf(m, "type %s {\n" | |
120 | "\tparent = %s;\n" | |
121 | "\tencoding = %s;\n" | |
122 | "};\n", type->name, | |
123 | astract_types[type->atype], | |
124 | string_encodings[type->u.string.encoding]); | |
125 | break; | |
40652b65 MD |
126 | default: |
127 | seq_printf(m, "<<< unknown abstract type %s for type %s >>>\n", | |
128 | astract_types[type->atype], | |
129 | type->name); | |
130 | } | |
131 | } | |
132 | ||
133 | static void *lttng_seq_start(struct seq_file *m, loff_t *pos) | |
134 | { | |
135 | struct lttng_type *type = <tng_types[*pos]; | |
136 | ||
137 | if (type > <tng_types[ARRAY_SIZE(lttng_types) - 1]) | |
138 | return NULL; | |
139 | return type; | |
140 | } | |
141 | ||
142 | static void *lttng_seq_next(struct seq_file *m, void *v, loff_t *ppos) | |
143 | { | |
144 | struct lttng_type *type = <tng_types[++(*ppos)]; | |
145 | ||
146 | if (type > <tng_types[ARRAY_SIZE(lttng_types) - 1]) | |
147 | return NULL; | |
148 | return type; | |
149 | } | |
150 | ||
151 | static void lttng_seq_stop(struct seq_file *m, void *v) | |
152 | { | |
153 | } | |
154 | ||
155 | static int lttng_seq_show(struct seq_file *m, void *v) | |
156 | { | |
157 | struct lttng_type *type = v; | |
158 | ||
159 | print_event_type(m, type); | |
160 | return 0; | |
161 | } | |
162 | ||
163 | static const struct seq_operations lttng_types_seq_ops = { | |
164 | .start = lttng_seq_start, | |
165 | .next = lttng_seq_next, | |
166 | .stop = lttng_seq_stop, | |
167 | .show = lttng_seq_show, | |
168 | }; | |
169 | ||
170 | static int | |
171 | lttng_types_open(struct inode *inode, struct file *file) | |
172 | { | |
173 | return seq_open(file, <tng_types_seq_ops); | |
174 | } | |
175 | ||
176 | static const struct file_operations lttng_types_fops = { | |
177 | .open = lttng_types_open, | |
178 | .read = seq_read, | |
179 | .llseek = seq_lseek, | |
180 | .release = seq_release_private, | |
181 | }; | |
182 | ||
183 | static int lttng_types_init(void) | |
184 | { | |
185 | int ret = 0; | |
186 | ||
187 | lttng_types_dentry = debugfs_create_file("lttng-types", S_IWUSR, | |
188 | NULL, NULL, <tng_types_fops); | |
189 | if (IS_ERR(lttng_types_dentry) || !lttng_types_dentry) { | |
190 | printk(KERN_ERR "Error creating LTTng type export file\n"); | |
191 | ret = -ENOMEM; | |
192 | goto error; | |
193 | } | |
194 | error: | |
195 | return ret; | |
196 | } | |
197 | ||
198 | module_init(lttng_types_init); | |
199 | ||
200 | static void lttng_types_exit(void) | |
201 | { | |
202 | debugfs_remove(lttng_types_dentry); | |
203 | } | |
204 | ||
205 | module_exit(lttng_types_exit); | |
206 | ||
207 | MODULE_LICENSE("GPL and additional rights"); | |
208 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
209 | MODULE_DESCRIPTION("LTTng types"); |