Commit | Line | Data |
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07dfc1d0 MD |
1 | /* |
2 | * lttng-filter.c | |
3 | * | |
4 | * LTTng modules filter code. | |
5 | * | |
bbf3aef5 | 6 | * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
07dfc1d0 | 7 | * |
bbf3aef5 MD |
8 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
9 | * of this software and associated documentation files (the "Software"), to deal | |
10 | * in the Software without restriction, including without limitation the rights | |
11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
12 | * copies of the Software, and to permit persons to whom the Software is | |
13 | * furnished to do so, subject to the following conditions: | |
07dfc1d0 | 14 | * |
bbf3aef5 MD |
15 | * The above copyright notice and this permission notice shall be included in |
16 | * all copies or substantial portions of the Software. | |
07dfc1d0 | 17 | * |
bbf3aef5 MD |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
21 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
24 | * SOFTWARE. | |
07dfc1d0 MD |
25 | */ |
26 | ||
27 | #include <linux/list.h> | |
28 | #include <linux/slab.h> | |
29 | ||
241ae9a8 | 30 | #include <lttng-filter.h> |
07dfc1d0 MD |
31 | |
32 | static const char *opnames[] = { | |
33 | [ FILTER_OP_UNKNOWN ] = "UNKNOWN", | |
34 | ||
35 | [ FILTER_OP_RETURN ] = "RETURN", | |
36 | ||
37 | /* binary */ | |
38 | [ FILTER_OP_MUL ] = "MUL", | |
39 | [ FILTER_OP_DIV ] = "DIV", | |
40 | [ FILTER_OP_MOD ] = "MOD", | |
41 | [ FILTER_OP_PLUS ] = "PLUS", | |
42 | [ FILTER_OP_MINUS ] = "MINUS", | |
43 | [ FILTER_OP_RSHIFT ] = "RSHIFT", | |
44 | [ FILTER_OP_LSHIFT ] = "LSHIFT", | |
45 | [ FILTER_OP_BIN_AND ] = "BIN_AND", | |
46 | [ FILTER_OP_BIN_OR ] = "BIN_OR", | |
47 | [ FILTER_OP_BIN_XOR ] = "BIN_XOR", | |
48 | ||
49 | /* binary comparators */ | |
50 | [ FILTER_OP_EQ ] = "EQ", | |
51 | [ FILTER_OP_NE ] = "NE", | |
52 | [ FILTER_OP_GT ] = "GT", | |
53 | [ FILTER_OP_LT ] = "LT", | |
54 | [ FILTER_OP_GE ] = "GE", | |
55 | [ FILTER_OP_LE ] = "LE", | |
56 | ||
57 | /* string binary comparators */ | |
58 | [ FILTER_OP_EQ_STRING ] = "EQ_STRING", | |
59 | [ FILTER_OP_NE_STRING ] = "NE_STRING", | |
60 | [ FILTER_OP_GT_STRING ] = "GT_STRING", | |
61 | [ FILTER_OP_LT_STRING ] = "LT_STRING", | |
62 | [ FILTER_OP_GE_STRING ] = "GE_STRING", | |
63 | [ FILTER_OP_LE_STRING ] = "LE_STRING", | |
64 | ||
65 | /* s64 binary comparators */ | |
66 | [ FILTER_OP_EQ_S64 ] = "EQ_S64", | |
67 | [ FILTER_OP_NE_S64 ] = "NE_S64", | |
68 | [ FILTER_OP_GT_S64 ] = "GT_S64", | |
69 | [ FILTER_OP_LT_S64 ] = "LT_S64", | |
70 | [ FILTER_OP_GE_S64 ] = "GE_S64", | |
71 | [ FILTER_OP_LE_S64 ] = "LE_S64", | |
72 | ||
73 | /* double binary comparators */ | |
74 | [ FILTER_OP_EQ_DOUBLE ] = "EQ_DOUBLE", | |
75 | [ FILTER_OP_NE_DOUBLE ] = "NE_DOUBLE", | |
76 | [ FILTER_OP_GT_DOUBLE ] = "GT_DOUBLE", | |
77 | [ FILTER_OP_LT_DOUBLE ] = "LT_DOUBLE", | |
78 | [ FILTER_OP_GE_DOUBLE ] = "GE_DOUBLE", | |
79 | [ FILTER_OP_LE_DOUBLE ] = "LE_DOUBLE", | |
80 | ||
81 | /* Mixed S64-double binary comparators */ | |
82 | [ FILTER_OP_EQ_DOUBLE_S64 ] = "EQ_DOUBLE_S64", | |
83 | [ FILTER_OP_NE_DOUBLE_S64 ] = "NE_DOUBLE_S64", | |
84 | [ FILTER_OP_GT_DOUBLE_S64 ] = "GT_DOUBLE_S64", | |
85 | [ FILTER_OP_LT_DOUBLE_S64 ] = "LT_DOUBLE_S64", | |
86 | [ FILTER_OP_GE_DOUBLE_S64 ] = "GE_DOUBLE_S64", | |
87 | [ FILTER_OP_LE_DOUBLE_S64 ] = "LE_DOUBLE_S64", | |
88 | ||
89 | [ FILTER_OP_EQ_S64_DOUBLE ] = "EQ_S64_DOUBLE", | |
90 | [ FILTER_OP_NE_S64_DOUBLE ] = "NE_S64_DOUBLE", | |
91 | [ FILTER_OP_GT_S64_DOUBLE ] = "GT_S64_DOUBLE", | |
92 | [ FILTER_OP_LT_S64_DOUBLE ] = "LT_S64_DOUBLE", | |
93 | [ FILTER_OP_GE_S64_DOUBLE ] = "GE_S64_DOUBLE", | |
94 | [ FILTER_OP_LE_S64_DOUBLE ] = "LE_S64_DOUBLE", | |
95 | ||
96 | /* unary */ | |
97 | [ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS", | |
98 | [ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS", | |
99 | [ FILTER_OP_UNARY_NOT ] = "UNARY_NOT", | |
100 | [ FILTER_OP_UNARY_PLUS_S64 ] = "UNARY_PLUS_S64", | |
101 | [ FILTER_OP_UNARY_MINUS_S64 ] = "UNARY_MINUS_S64", | |
102 | [ FILTER_OP_UNARY_NOT_S64 ] = "UNARY_NOT_S64", | |
103 | [ FILTER_OP_UNARY_PLUS_DOUBLE ] = "UNARY_PLUS_DOUBLE", | |
104 | [ FILTER_OP_UNARY_MINUS_DOUBLE ] = "UNARY_MINUS_DOUBLE", | |
105 | [ FILTER_OP_UNARY_NOT_DOUBLE ] = "UNARY_NOT_DOUBLE", | |
106 | ||
107 | /* logical */ | |
108 | [ FILTER_OP_AND ] = "AND", | |
109 | [ FILTER_OP_OR ] = "OR", | |
110 | ||
111 | /* load field ref */ | |
112 | [ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF", | |
113 | [ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING", | |
114 | [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE", | |
115 | [ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64", | |
116 | [ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE", | |
117 | ||
118 | /* load from immediate operand */ | |
119 | [ FILTER_OP_LOAD_STRING ] = "LOAD_STRING", | |
120 | [ FILTER_OP_LOAD_S64 ] = "LOAD_S64", | |
121 | [ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE", | |
122 | ||
123 | /* cast */ | |
124 | [ FILTER_OP_CAST_TO_S64 ] = "CAST_TO_S64", | |
125 | [ FILTER_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64", | |
126 | [ FILTER_OP_CAST_NOP ] = "CAST_NOP", | |
127 | ||
128 | /* get context ref */ | |
129 | [ FILTER_OP_GET_CONTEXT_REF ] = "GET_CONTEXT_REF", | |
130 | [ FILTER_OP_GET_CONTEXT_REF_STRING ] = "GET_CONTEXT_REF_STRING", | |
131 | [ FILTER_OP_GET_CONTEXT_REF_S64 ] = "GET_CONTEXT_REF_S64", | |
132 | [ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = "GET_CONTEXT_REF_DOUBLE", | |
f127e61e MD |
133 | |
134 | /* load userspace field ref */ | |
135 | [ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = "LOAD_FIELD_REF_USER_STRING", | |
136 | [ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = "LOAD_FIELD_REF_USER_SEQUENCE", | |
83fb57ab MD |
137 | |
138 | /* | |
139 | * load immediate star globbing pattern (literal string) | |
140 | * from immediate. | |
141 | */ | |
142 | [ FILTER_OP_LOAD_STAR_GLOB_STRING ] = "LOAD_STAR_GLOB_STRING", | |
143 | ||
144 | /* globbing pattern binary operator: apply to */ | |
145 | [ FILTER_OP_EQ_STAR_GLOB_STRING ] = "EQ_STAR_GLOB_STRING", | |
146 | [ FILTER_OP_NE_STAR_GLOB_STRING ] = "NE_STAR_GLOB_STRING", | |
07dfc1d0 MD |
147 | }; |
148 | ||
149 | const char *lttng_filter_print_op(enum filter_op op) | |
150 | { | |
151 | if (op >= NR_FILTER_OPS) | |
152 | return "UNKNOWN"; | |
153 | else | |
154 | return opnames[op]; | |
155 | } | |
156 | ||
157 | static | |
158 | int apply_field_reloc(struct lttng_event *event, | |
159 | struct bytecode_runtime *runtime, | |
160 | uint32_t runtime_len, | |
161 | uint32_t reloc_offset, | |
162 | const char *field_name) | |
163 | { | |
164 | const struct lttng_event_desc *desc; | |
165 | const struct lttng_event_field *fields, *field = NULL; | |
166 | unsigned int nr_fields, i; | |
167 | struct field_ref *field_ref; | |
168 | struct load_op *op; | |
169 | uint32_t field_offset = 0; | |
170 | ||
171 | dbg_printk("Apply field reloc: %u %s\n", reloc_offset, field_name); | |
172 | ||
173 | /* Lookup event by name */ | |
174 | desc = event->desc; | |
175 | if (!desc) | |
176 | return -EINVAL; | |
177 | fields = desc->fields; | |
178 | if (!fields) | |
179 | return -EINVAL; | |
180 | nr_fields = desc->nr_fields; | |
181 | for (i = 0; i < nr_fields; i++) { | |
182 | if (!strcmp(fields[i].name, field_name)) { | |
183 | field = &fields[i]; | |
184 | break; | |
185 | } | |
186 | /* compute field offset */ | |
187 | switch (fields[i].type.atype) { | |
188 | case atype_integer: | |
189 | case atype_enum: | |
190 | field_offset += sizeof(int64_t); | |
191 | break; | |
192 | case atype_array: | |
193 | case atype_sequence: | |
194 | field_offset += sizeof(unsigned long); | |
195 | field_offset += sizeof(void *); | |
196 | break; | |
197 | case atype_string: | |
198 | field_offset += sizeof(void *); | |
199 | break; | |
f513b2bf MD |
200 | case atype_struct: /* Unsupported. */ |
201 | case atype_array_compound: /* Unsupported. */ | |
202 | case atype_sequence_compound: /* Unsupported. */ | |
65c85aa6 | 203 | case atype_variant: /* Unsupported. */ |
07dfc1d0 MD |
204 | default: |
205 | return -EINVAL; | |
206 | } | |
207 | } | |
208 | if (!field) | |
209 | return -EINVAL; | |
210 | ||
211 | /* Check if field offset is too large for 16-bit offset */ | |
f127e61e | 212 | if (field_offset > LTTNG_KERNEL_FILTER_BYTECODE_MAX_LEN - 1) |
07dfc1d0 MD |
213 | return -EINVAL; |
214 | ||
215 | /* set type */ | |
216 | op = (struct load_op *) &runtime->data[reloc_offset]; | |
217 | field_ref = (struct field_ref *) op->data; | |
218 | switch (field->type.atype) { | |
219 | case atype_integer: | |
220 | case atype_enum: | |
221 | op->op = FILTER_OP_LOAD_FIELD_REF_S64; | |
222 | break; | |
223 | case atype_array: | |
224 | case atype_sequence: | |
f127e61e MD |
225 | if (field->user) |
226 | op->op = FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE; | |
227 | else | |
228 | op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE; | |
07dfc1d0 MD |
229 | break; |
230 | case atype_string: | |
f127e61e MD |
231 | if (field->user) |
232 | op->op = FILTER_OP_LOAD_FIELD_REF_USER_STRING; | |
233 | else | |
234 | op->op = FILTER_OP_LOAD_FIELD_REF_STRING; | |
07dfc1d0 | 235 | break; |
f513b2bf MD |
236 | case atype_struct: /* Unsupported. */ |
237 | case atype_array_compound: /* Unsupported. */ | |
238 | case atype_sequence_compound: /* Unsupported. */ | |
65c85aa6 | 239 | case atype_variant: /* Unsupported. */ |
07dfc1d0 MD |
240 | default: |
241 | return -EINVAL; | |
242 | } | |
243 | /* set offset */ | |
244 | field_ref->offset = (uint16_t) field_offset; | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static | |
249 | int apply_context_reloc(struct lttng_event *event, | |
250 | struct bytecode_runtime *runtime, | |
251 | uint32_t runtime_len, | |
252 | uint32_t reloc_offset, | |
253 | const char *context_name) | |
254 | { | |
255 | struct field_ref *field_ref; | |
256 | struct load_op *op; | |
257 | struct lttng_ctx_field *ctx_field; | |
258 | int idx; | |
259 | ||
260 | dbg_printk("Apply context reloc: %u %s\n", reloc_offset, context_name); | |
261 | ||
262 | /* Get context index */ | |
263 | idx = lttng_get_context_index(lttng_static_ctx, context_name); | |
264 | if (idx < 0) | |
265 | return -ENOENT; | |
266 | ||
267 | /* Check if idx is too large for 16-bit offset */ | |
f127e61e | 268 | if (idx > LTTNG_KERNEL_FILTER_BYTECODE_MAX_LEN - 1) |
07dfc1d0 MD |
269 | return -EINVAL; |
270 | ||
271 | /* Get context return type */ | |
272 | ctx_field = <tng_static_ctx->fields[idx]; | |
273 | op = (struct load_op *) &runtime->data[reloc_offset]; | |
274 | field_ref = (struct field_ref *) op->data; | |
275 | switch (ctx_field->event_field.type.atype) { | |
276 | case atype_integer: | |
277 | case atype_enum: | |
278 | op->op = FILTER_OP_GET_CONTEXT_REF_S64; | |
279 | break; | |
280 | /* Sequence and array supported as string */ | |
281 | case atype_string: | |
282 | case atype_array: | |
283 | case atype_sequence: | |
f127e61e | 284 | BUG_ON(ctx_field->event_field.user); |
07dfc1d0 MD |
285 | op->op = FILTER_OP_GET_CONTEXT_REF_STRING; |
286 | break; | |
f513b2bf MD |
287 | case atype_struct: /* Unsupported. */ |
288 | case atype_array_compound: /* Unsupported. */ | |
289 | case atype_sequence_compound: /* Unsupported. */ | |
65c85aa6 | 290 | case atype_variant: /* Unsupported. */ |
07dfc1d0 MD |
291 | default: |
292 | return -EINVAL; | |
293 | } | |
294 | /* set offset to context index within channel contexts */ | |
295 | field_ref->offset = (uint16_t) idx; | |
296 | return 0; | |
297 | } | |
298 | ||
299 | static | |
300 | int apply_reloc(struct lttng_event *event, | |
301 | struct bytecode_runtime *runtime, | |
302 | uint32_t runtime_len, | |
303 | uint32_t reloc_offset, | |
304 | const char *name) | |
305 | { | |
306 | struct load_op *op; | |
307 | ||
308 | dbg_printk("Apply reloc: %u %s\n", reloc_offset, name); | |
309 | ||
310 | /* Ensure that the reloc is within the code */ | |
311 | if (runtime_len - reloc_offset < sizeof(uint16_t)) | |
312 | return -EINVAL; | |
313 | ||
314 | op = (struct load_op *) &runtime->data[reloc_offset]; | |
315 | switch (op->op) { | |
316 | case FILTER_OP_LOAD_FIELD_REF: | |
317 | return apply_field_reloc(event, runtime, runtime_len, | |
318 | reloc_offset, name); | |
319 | case FILTER_OP_GET_CONTEXT_REF: | |
320 | return apply_context_reloc(event, runtime, runtime_len, | |
321 | reloc_offset, name); | |
322 | default: | |
323 | printk(KERN_WARNING "Unknown reloc op type %u\n", op->op); | |
324 | return -EINVAL; | |
325 | } | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static | |
330 | int bytecode_is_linked(struct lttng_filter_bytecode_node *filter_bytecode, | |
331 | struct lttng_event *event) | |
332 | { | |
333 | struct lttng_bytecode_runtime *bc_runtime; | |
334 | ||
335 | list_for_each_entry(bc_runtime, | |
336 | &event->bytecode_runtime_head, node) { | |
337 | if (bc_runtime->bc == filter_bytecode) | |
338 | return 1; | |
339 | } | |
340 | return 0; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Take a bytecode with reloc table and link it to an event to create a | |
345 | * bytecode runtime. | |
346 | */ | |
347 | static | |
348 | int _lttng_filter_event_link_bytecode(struct lttng_event *event, | |
349 | struct lttng_filter_bytecode_node *filter_bytecode, | |
350 | struct list_head *insert_loc) | |
351 | { | |
352 | int ret, offset, next_offset; | |
353 | struct bytecode_runtime *runtime = NULL; | |
354 | size_t runtime_alloc_len; | |
355 | ||
356 | if (!filter_bytecode) | |
357 | return 0; | |
358 | /* Bytecode already linked */ | |
359 | if (bytecode_is_linked(filter_bytecode, event)) | |
360 | return 0; | |
361 | ||
362 | dbg_printk("Linking...\n"); | |
363 | ||
364 | /* We don't need the reloc table in the runtime */ | |
365 | runtime_alloc_len = sizeof(*runtime) + filter_bytecode->bc.reloc_offset; | |
366 | runtime = kzalloc(runtime_alloc_len, GFP_KERNEL); | |
367 | if (!runtime) { | |
368 | ret = -ENOMEM; | |
369 | goto alloc_error; | |
370 | } | |
371 | runtime->p.bc = filter_bytecode; | |
372 | runtime->len = filter_bytecode->bc.reloc_offset; | |
373 | /* copy original bytecode */ | |
374 | memcpy(runtime->data, filter_bytecode->bc.data, runtime->len); | |
375 | /* | |
376 | * apply relocs. Those are a uint16_t (offset in bytecode) | |
377 | * followed by a string (field name). | |
378 | */ | |
379 | for (offset = filter_bytecode->bc.reloc_offset; | |
380 | offset < filter_bytecode->bc.len; | |
381 | offset = next_offset) { | |
382 | uint16_t reloc_offset = | |
383 | *(uint16_t *) &filter_bytecode->bc.data[offset]; | |
384 | const char *name = | |
385 | (const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)]; | |
386 | ||
387 | ret = apply_reloc(event, runtime, runtime->len, reloc_offset, name); | |
388 | if (ret) { | |
389 | goto link_error; | |
390 | } | |
391 | next_offset = offset + sizeof(uint16_t) + strlen(name) + 1; | |
392 | } | |
393 | /* Validate bytecode */ | |
394 | ret = lttng_filter_validate_bytecode(runtime); | |
395 | if (ret) { | |
396 | goto link_error; | |
397 | } | |
398 | /* Specialize bytecode */ | |
399 | ret = lttng_filter_specialize_bytecode(runtime); | |
400 | if (ret) { | |
401 | goto link_error; | |
402 | } | |
403 | runtime->p.filter = lttng_filter_interpret_bytecode; | |
404 | runtime->p.link_failed = 0; | |
405 | list_add_rcu(&runtime->p.node, insert_loc); | |
406 | dbg_printk("Linking successful.\n"); | |
407 | return 0; | |
408 | ||
409 | link_error: | |
410 | runtime->p.filter = lttng_filter_false; | |
411 | runtime->p.link_failed = 1; | |
412 | list_add_rcu(&runtime->p.node, insert_loc); | |
413 | alloc_error: | |
414 | dbg_printk("Linking failed.\n"); | |
415 | return ret; | |
416 | } | |
417 | ||
418 | void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime) | |
419 | { | |
420 | struct lttng_filter_bytecode_node *bc = runtime->bc; | |
421 | ||
422 | if (!bc->enabler->enabled || runtime->link_failed) | |
423 | runtime->filter = lttng_filter_false; | |
424 | else | |
425 | runtime->filter = lttng_filter_interpret_bytecode; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Link bytecode for all enablers referenced by an event. | |
430 | */ | |
431 | void lttng_enabler_event_link_bytecode(struct lttng_event *event, | |
432 | struct lttng_enabler *enabler) | |
433 | { | |
434 | struct lttng_filter_bytecode_node *bc; | |
435 | struct lttng_bytecode_runtime *runtime; | |
436 | ||
437 | /* Can only be called for events with desc attached */ | |
438 | WARN_ON_ONCE(!event->desc); | |
439 | ||
440 | /* Link each bytecode. */ | |
441 | list_for_each_entry(bc, &enabler->filter_bytecode_head, node) { | |
442 | int found = 0, ret; | |
443 | struct list_head *insert_loc; | |
444 | ||
445 | list_for_each_entry(runtime, | |
446 | &event->bytecode_runtime_head, node) { | |
447 | if (runtime->bc == bc) { | |
448 | found = 1; | |
449 | break; | |
450 | } | |
451 | } | |
452 | /* Skip bytecode already linked */ | |
453 | if (found) | |
454 | continue; | |
455 | ||
456 | /* | |
457 | * Insert at specified priority (seqnum) in increasing | |
458 | * order. | |
459 | */ | |
460 | list_for_each_entry_reverse(runtime, | |
461 | &event->bytecode_runtime_head, node) { | |
462 | if (runtime->bc->bc.seqnum < bc->bc.seqnum) { | |
463 | /* insert here */ | |
464 | insert_loc = &runtime->node; | |
465 | goto add_within; | |
466 | } | |
467 | } | |
468 | /* Add to head to list */ | |
469 | insert_loc = &event->bytecode_runtime_head; | |
470 | add_within: | |
471 | dbg_printk("linking bytecode\n"); | |
472 | ret = _lttng_filter_event_link_bytecode(event, bc, | |
473 | insert_loc); | |
474 | if (ret) { | |
475 | dbg_printk("[lttng filter] warning: cannot link event bytecode\n"); | |
476 | } | |
477 | } | |
478 | } | |
479 | ||
480 | /* | |
481 | * We own the filter_bytecode if we return success. | |
482 | */ | |
483 | int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler, | |
484 | struct lttng_filter_bytecode_node *filter_bytecode) | |
485 | { | |
486 | list_add(&filter_bytecode->node, &enabler->filter_bytecode_head); | |
487 | return 0; | |
488 | } | |
489 | ||
490 | void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler) | |
491 | { | |
492 | struct lttng_filter_bytecode_node *filter_bytecode, *tmp; | |
493 | ||
494 | list_for_each_entry_safe(filter_bytecode, tmp, | |
495 | &enabler->filter_bytecode_head, node) { | |
496 | kfree(filter_bytecode); | |
497 | } | |
498 | } | |
499 | ||
500 | void lttng_free_event_filter_runtime(struct lttng_event *event) | |
501 | { | |
502 | struct bytecode_runtime *runtime, *tmp; | |
503 | ||
504 | list_for_each_entry_safe(runtime, tmp, | |
505 | &event->bytecode_runtime_head, p.node) { | |
506 | kfree(runtime); | |
507 | } | |
508 | } |