1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * trace_events_hist - trace event hist triggers |
4 | * |
5 | * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com> |
6 | */ |
7 | |
8 | #include <linux/module.h> |
9 | #include <linux/kallsyms.h> |
10 | #include <linux/security.h> |
11 | #include <linux/mutex.h> |
12 | #include <linux/slab.h> |
13 | #include <linux/stacktrace.h> |
14 | #include <linux/rculist.h> |
15 | #include <linux/tracefs.h> |
16 | |
17 | /* for gfp flag names */ |
18 | #include <linux/trace_events.h> |
19 | #include <trace/events/mmflags.h> |
20 | |
21 | #include "tracing_map.h" |
22 | #include "trace_synth.h" |
23 | |
24 | #define ERRORS \ |
25 | C(NONE, "No error"), \ |
26 | C(DUPLICATE_VAR, "Variable already defined"), \ |
27 | C(VAR_NOT_UNIQUE, "Variable name not unique, need to use fully qualified name (subsys.event.var) for variable"), \ |
28 | C(TOO_MANY_VARS, "Too many variables defined"), \ |
29 | C(MALFORMED_ASSIGNMENT, "Malformed assignment"), \ |
30 | C(NAMED_MISMATCH, "Named hist trigger doesn't match existing named trigger (includes variables)"), \ |
31 | C(TRIGGER_EEXIST, "Hist trigger already exists"), \ |
32 | C(TRIGGER_ENOENT_CLEAR, "Can't clear or continue a nonexistent hist trigger"), \ |
33 | C(SET_CLOCK_FAIL, "Couldn't set trace_clock"), \ |
34 | C(BAD_FIELD_MODIFIER, "Invalid field modifier"), \ |
35 | C(TOO_MANY_SUBEXPR, "Too many subexpressions (3 max)"), \ |
36 | C(TIMESTAMP_MISMATCH, "Timestamp units in expression don't match"), \ |
37 | C(TOO_MANY_FIELD_VARS, "Too many field variables defined"), \ |
38 | C(EVENT_FILE_NOT_FOUND, "Event file not found"), \ |
39 | C(HIST_NOT_FOUND, "Matching event histogram not found"), \ |
40 | C(HIST_CREATE_FAIL, "Couldn't create histogram for field"), \ |
41 | C(SYNTH_VAR_NOT_FOUND, "Couldn't find synthetic variable"), \ |
42 | C(SYNTH_EVENT_NOT_FOUND,"Couldn't find synthetic event"), \ |
43 | C(SYNTH_TYPE_MISMATCH, "Param type doesn't match synthetic event field type"), \ |
44 | C(SYNTH_COUNT_MISMATCH, "Param count doesn't match synthetic event field count"), \ |
45 | C(FIELD_VAR_PARSE_FAIL, "Couldn't parse field variable"), \ |
46 | C(VAR_CREATE_FIND_FAIL, "Couldn't create or find variable"), \ |
47 | C(ONX_NOT_VAR, "For onmax(x) or onchange(x), x must be a variable"), \ |
48 | C(ONX_VAR_NOT_FOUND, "Couldn't find onmax or onchange variable"), \ |
49 | C(ONX_VAR_CREATE_FAIL, "Couldn't create onmax or onchange variable"), \ |
50 | C(FIELD_VAR_CREATE_FAIL,"Couldn't create field variable"), \ |
51 | C(TOO_MANY_PARAMS, "Too many action params"), \ |
52 | C(PARAM_NOT_FOUND, "Couldn't find param"), \ |
53 | C(INVALID_PARAM, "Invalid action param"), \ |
54 | C(ACTION_NOT_FOUND, "No action found"), \ |
55 | C(NO_SAVE_PARAMS, "No params found for save()"), \ |
56 | C(TOO_MANY_SAVE_ACTIONS,"Can't have more than one save() action per hist"), \ |
57 | C(ACTION_MISMATCH, "Handler doesn't support action"), \ |
58 | C(NO_CLOSING_PAREN, "No closing paren found"), \ |
59 | C(SUBSYS_NOT_FOUND, "Missing subsystem"), \ |
60 | C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \ |
61 | C(INVALID_REF_KEY, "Using variable references in keys not supported"), \ |
62 | C(VAR_NOT_FOUND, "Couldn't find variable"), \ |
63 | C(FIELD_NOT_FOUND, "Couldn't find field"), \ |
64 | C(EMPTY_ASSIGNMENT, "Empty assignment"), \ |
65 | C(INVALID_SORT_MODIFIER,"Invalid sort modifier"), \ |
66 | C(EMPTY_SORT_FIELD, "Empty sort field"), \ |
67 | C(TOO_MANY_SORT_FIELDS, "Too many sort fields (Max = 2)"), \ |
68 | C(INVALID_SORT_FIELD, "Sort field must be a key or a val"), \ |
69 | C(INVALID_STR_OPERAND, "String type can not be an operand in expression"), \ |
70 | C(EXPECT_NUMBER, "Expecting numeric literal"), \ |
71 | C(UNARY_MINUS_SUBEXPR, "Unary minus not supported in sub-expressions"), \ |
72 | C(DIVISION_BY_ZERO, "Division by zero"), \ |
73 | C(NEED_NOHC_VAL, "Non-hitcount value is required for 'nohitcount'"), |
74 | |
75 | #undef C |
76 | #define C(a, b) HIST_ERR_##a |
77 | |
78 | enum { ERRORS }; |
79 | |
80 | #undef C |
81 | #define C(a, b) b |
82 | |
83 | static const char *err_text[] = { ERRORS }; |
84 | |
85 | struct hist_field; |
86 | |
87 | typedef u64 (*hist_field_fn_t) (struct hist_field *field, |
88 | struct tracing_map_elt *elt, |
89 | struct trace_buffer *buffer, |
90 | struct ring_buffer_event *rbe, |
91 | void *event); |
92 | |
93 | #define HIST_FIELD_OPERANDS_MAX 2 |
94 | #define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX) |
95 | #define HIST_ACTIONS_MAX 8 |
96 | #define HIST_CONST_DIGITS_MAX 21 |
97 | #define HIST_DIV_SHIFT 20 /* For optimizing division by constants */ |
98 | |
99 | enum field_op_id { |
100 | FIELD_OP_NONE, |
101 | FIELD_OP_PLUS, |
102 | FIELD_OP_MINUS, |
103 | FIELD_OP_UNARY_MINUS, |
104 | FIELD_OP_DIV, |
105 | FIELD_OP_MULT, |
106 | }; |
107 | |
108 | enum hist_field_fn { |
109 | HIST_FIELD_FN_NOP, |
110 | HIST_FIELD_FN_VAR_REF, |
111 | HIST_FIELD_FN_COUNTER, |
112 | HIST_FIELD_FN_CONST, |
113 | HIST_FIELD_FN_LOG2, |
114 | HIST_FIELD_FN_BUCKET, |
115 | HIST_FIELD_FN_TIMESTAMP, |
116 | HIST_FIELD_FN_CPU, |
117 | HIST_FIELD_FN_STRING, |
118 | HIST_FIELD_FN_DYNSTRING, |
119 | HIST_FIELD_FN_RELDYNSTRING, |
120 | HIST_FIELD_FN_PSTRING, |
121 | HIST_FIELD_FN_S64, |
122 | HIST_FIELD_FN_U64, |
123 | HIST_FIELD_FN_S32, |
124 | HIST_FIELD_FN_U32, |
125 | HIST_FIELD_FN_S16, |
126 | HIST_FIELD_FN_U16, |
127 | HIST_FIELD_FN_S8, |
128 | HIST_FIELD_FN_U8, |
129 | HIST_FIELD_FN_UMINUS, |
130 | HIST_FIELD_FN_MINUS, |
131 | HIST_FIELD_FN_PLUS, |
132 | HIST_FIELD_FN_DIV, |
133 | HIST_FIELD_FN_MULT, |
134 | HIST_FIELD_FN_DIV_POWER2, |
135 | HIST_FIELD_FN_DIV_NOT_POWER2, |
136 | HIST_FIELD_FN_DIV_MULT_SHIFT, |
137 | HIST_FIELD_FN_EXECNAME, |
138 | HIST_FIELD_FN_STACK, |
139 | }; |
140 | |
141 | /* |
142 | * A hist_var (histogram variable) contains variable information for |
143 | * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF |
144 | * flag set. A hist_var has a variable name e.g. ts0, and is |
145 | * associated with a given histogram trigger, as specified by |
146 | * hist_data. The hist_var idx is the unique index assigned to the |
147 | * variable by the hist trigger's tracing_map. The idx is what is |
148 | * used to set a variable's value and, by a variable reference, to |
149 | * retrieve it. |
150 | */ |
151 | struct hist_var { |
152 | char *name; |
153 | struct hist_trigger_data *hist_data; |
154 | unsigned int idx; |
155 | }; |
156 | |
157 | struct hist_field { |
158 | struct ftrace_event_field *field; |
159 | unsigned long flags; |
160 | unsigned long buckets; |
161 | const char *type; |
162 | struct hist_field *operands[HIST_FIELD_OPERANDS_MAX]; |
163 | struct hist_trigger_data *hist_data; |
164 | enum hist_field_fn fn_num; |
165 | unsigned int ref; |
166 | unsigned int size; |
167 | unsigned int offset; |
168 | unsigned int is_signed; |
169 | |
170 | /* |
171 | * Variable fields contain variable-specific info in var. |
172 | */ |
173 | struct hist_var var; |
174 | enum field_op_id operator; |
175 | char *system; |
176 | char *event_name; |
177 | |
178 | /* |
179 | * The name field is used for EXPR and VAR_REF fields. VAR |
180 | * fields contain the variable name in var.name. |
181 | */ |
182 | char *name; |
183 | |
184 | /* |
185 | * When a histogram trigger is hit, if it has any references |
186 | * to variables, the values of those variables are collected |
187 | * into a var_ref_vals array by resolve_var_refs(). The |
188 | * current value of each variable is read from the tracing_map |
189 | * using the hist field's hist_var.idx and entered into the |
190 | * var_ref_idx entry i.e. var_ref_vals[var_ref_idx]. |
191 | */ |
192 | unsigned int var_ref_idx; |
193 | bool read_once; |
194 | |
195 | unsigned int var_str_idx; |
196 | |
197 | /* Numeric literals are represented as u64 */ |
198 | u64 constant; |
199 | /* Used to optimize division by constants */ |
200 | u64 div_multiplier; |
201 | }; |
202 | |
203 | static u64 hist_fn_call(struct hist_field *hist_field, |
204 | struct tracing_map_elt *elt, |
205 | struct trace_buffer *buffer, |
206 | struct ring_buffer_event *rbe, |
207 | void *event); |
208 | |
209 | static u64 hist_field_const(struct hist_field *field, |
210 | struct tracing_map_elt *elt, |
211 | struct trace_buffer *buffer, |
212 | struct ring_buffer_event *rbe, |
213 | void *event) |
214 | { |
215 | return field->constant; |
216 | } |
217 | |
218 | static u64 hist_field_counter(struct hist_field *field, |
219 | struct tracing_map_elt *elt, |
220 | struct trace_buffer *buffer, |
221 | struct ring_buffer_event *rbe, |
222 | void *event) |
223 | { |
224 | return 1; |
225 | } |
226 | |
227 | static u64 hist_field_string(struct hist_field *hist_field, |
228 | struct tracing_map_elt *elt, |
229 | struct trace_buffer *buffer, |
230 | struct ring_buffer_event *rbe, |
231 | void *event) |
232 | { |
233 | char *addr = (char *)(event + hist_field->field->offset); |
234 | |
235 | return (u64)(unsigned long)addr; |
236 | } |
237 | |
238 | static u64 hist_field_dynstring(struct hist_field *hist_field, |
239 | struct tracing_map_elt *elt, |
240 | struct trace_buffer *buffer, |
241 | struct ring_buffer_event *rbe, |
242 | void *event) |
243 | { |
244 | u32 str_item = *(u32 *)(event + hist_field->field->offset); |
245 | int str_loc = str_item & 0xffff; |
246 | char *addr = (char *)(event + str_loc); |
247 | |
248 | return (u64)(unsigned long)addr; |
249 | } |
250 | |
251 | static u64 hist_field_reldynstring(struct hist_field *hist_field, |
252 | struct tracing_map_elt *elt, |
253 | struct trace_buffer *buffer, |
254 | struct ring_buffer_event *rbe, |
255 | void *event) |
256 | { |
257 | u32 *item = event + hist_field->field->offset; |
258 | u32 str_item = *item; |
259 | int str_loc = str_item & 0xffff; |
260 | char *addr = (char *)&item[1] + str_loc; |
261 | |
262 | return (u64)(unsigned long)addr; |
263 | } |
264 | |
265 | static u64 hist_field_pstring(struct hist_field *hist_field, |
266 | struct tracing_map_elt *elt, |
267 | struct trace_buffer *buffer, |
268 | struct ring_buffer_event *rbe, |
269 | void *event) |
270 | { |
271 | char **addr = (char **)(event + hist_field->field->offset); |
272 | |
273 | return (u64)(unsigned long)*addr; |
274 | } |
275 | |
276 | static u64 hist_field_log2(struct hist_field *hist_field, |
277 | struct tracing_map_elt *elt, |
278 | struct trace_buffer *buffer, |
279 | struct ring_buffer_event *rbe, |
280 | void *event) |
281 | { |
282 | struct hist_field *operand = hist_field->operands[0]; |
283 | |
284 | u64 val = hist_fn_call(hist_field: operand, elt, buffer, rbe, event); |
285 | |
286 | return (u64) ilog2(roundup_pow_of_two(val)); |
287 | } |
288 | |
289 | static u64 hist_field_bucket(struct hist_field *hist_field, |
290 | struct tracing_map_elt *elt, |
291 | struct trace_buffer *buffer, |
292 | struct ring_buffer_event *rbe, |
293 | void *event) |
294 | { |
295 | struct hist_field *operand = hist_field->operands[0]; |
296 | unsigned long buckets = hist_field->buckets; |
297 | |
298 | u64 val = hist_fn_call(hist_field: operand, elt, buffer, rbe, event); |
299 | |
300 | if (WARN_ON_ONCE(!buckets)) |
301 | return val; |
302 | |
303 | if (val >= LONG_MAX) |
304 | val = div64_ul(val, buckets); |
305 | else |
306 | val = (u64)((unsigned long)val / buckets); |
307 | return val * buckets; |
308 | } |
309 | |
310 | static u64 hist_field_plus(struct hist_field *hist_field, |
311 | struct tracing_map_elt *elt, |
312 | struct trace_buffer *buffer, |
313 | struct ring_buffer_event *rbe, |
314 | void *event) |
315 | { |
316 | struct hist_field *operand1 = hist_field->operands[0]; |
317 | struct hist_field *operand2 = hist_field->operands[1]; |
318 | |
319 | u64 val1 = hist_fn_call(hist_field: operand1, elt, buffer, rbe, event); |
320 | u64 val2 = hist_fn_call(hist_field: operand2, elt, buffer, rbe, event); |
321 | |
322 | return val1 + val2; |
323 | } |
324 | |
325 | static u64 hist_field_minus(struct hist_field *hist_field, |
326 | struct tracing_map_elt *elt, |
327 | struct trace_buffer *buffer, |
328 | struct ring_buffer_event *rbe, |
329 | void *event) |
330 | { |
331 | struct hist_field *operand1 = hist_field->operands[0]; |
332 | struct hist_field *operand2 = hist_field->operands[1]; |
333 | |
334 | u64 val1 = hist_fn_call(hist_field: operand1, elt, buffer, rbe, event); |
335 | u64 val2 = hist_fn_call(hist_field: operand2, elt, buffer, rbe, event); |
336 | |
337 | return val1 - val2; |
338 | } |
339 | |
340 | static u64 hist_field_div(struct hist_field *hist_field, |
341 | struct tracing_map_elt *elt, |
342 | struct trace_buffer *buffer, |
343 | struct ring_buffer_event *rbe, |
344 | void *event) |
345 | { |
346 | struct hist_field *operand1 = hist_field->operands[0]; |
347 | struct hist_field *operand2 = hist_field->operands[1]; |
348 | |
349 | u64 val1 = hist_fn_call(hist_field: operand1, elt, buffer, rbe, event); |
350 | u64 val2 = hist_fn_call(hist_field: operand2, elt, buffer, rbe, event); |
351 | |
352 | /* Return -1 for the undefined case */ |
353 | if (!val2) |
354 | return -1; |
355 | |
356 | /* Use shift if the divisor is a power of 2 */ |
357 | if (!(val2 & (val2 - 1))) |
358 | return val1 >> __ffs64(word: val2); |
359 | |
360 | return div64_u64(dividend: val1, divisor: val2); |
361 | } |
362 | |
363 | static u64 div_by_power_of_two(struct hist_field *hist_field, |
364 | struct tracing_map_elt *elt, |
365 | struct trace_buffer *buffer, |
366 | struct ring_buffer_event *rbe, |
367 | void *event) |
368 | { |
369 | struct hist_field *operand1 = hist_field->operands[0]; |
370 | struct hist_field *operand2 = hist_field->operands[1]; |
371 | |
372 | u64 val1 = hist_fn_call(hist_field: operand1, elt, buffer, rbe, event); |
373 | |
374 | return val1 >> __ffs64(word: operand2->constant); |
375 | } |
376 | |
377 | static u64 div_by_not_power_of_two(struct hist_field *hist_field, |
378 | struct tracing_map_elt *elt, |
379 | struct trace_buffer *buffer, |
380 | struct ring_buffer_event *rbe, |
381 | void *event) |
382 | { |
383 | struct hist_field *operand1 = hist_field->operands[0]; |
384 | struct hist_field *operand2 = hist_field->operands[1]; |
385 | |
386 | u64 val1 = hist_fn_call(hist_field: operand1, elt, buffer, rbe, event); |
387 | |
388 | return div64_u64(dividend: val1, divisor: operand2->constant); |
389 | } |
390 | |
391 | static u64 div_by_mult_and_shift(struct hist_field *hist_field, |
392 | struct tracing_map_elt *elt, |
393 | struct trace_buffer *buffer, |
394 | struct ring_buffer_event *rbe, |
395 | void *event) |
396 | { |
397 | struct hist_field *operand1 = hist_field->operands[0]; |
398 | struct hist_field *operand2 = hist_field->operands[1]; |
399 | |
400 | u64 val1 = hist_fn_call(hist_field: operand1, elt, buffer, rbe, event); |
401 | |
402 | /* |
403 | * If the divisor is a constant, do a multiplication and shift instead. |
404 | * |
405 | * Choose Z = some power of 2. If Y <= Z, then: |
406 | * X / Y = (X * (Z / Y)) / Z |
407 | * |
408 | * (Z / Y) is a constant (mult) which is calculated at parse time, so: |
409 | * X / Y = (X * mult) / Z |
410 | * |
411 | * The division by Z can be replaced by a shift since Z is a power of 2: |
412 | * X / Y = (X * mult) >> HIST_DIV_SHIFT |
413 | * |
414 | * As long, as X < Z the results will not be off by more than 1. |
415 | */ |
416 | if (val1 < (1 << HIST_DIV_SHIFT)) { |
417 | u64 mult = operand2->div_multiplier; |
418 | |
419 | return (val1 * mult + ((1 << HIST_DIV_SHIFT) - 1)) >> HIST_DIV_SHIFT; |
420 | } |
421 | |
422 | return div64_u64(dividend: val1, divisor: operand2->constant); |
423 | } |
424 | |
425 | static u64 hist_field_mult(struct hist_field *hist_field, |
426 | struct tracing_map_elt *elt, |
427 | struct trace_buffer *buffer, |
428 | struct ring_buffer_event *rbe, |
429 | void *event) |
430 | { |
431 | struct hist_field *operand1 = hist_field->operands[0]; |
432 | struct hist_field *operand2 = hist_field->operands[1]; |
433 | |
434 | u64 val1 = hist_fn_call(hist_field: operand1, elt, buffer, rbe, event); |
435 | u64 val2 = hist_fn_call(hist_field: operand2, elt, buffer, rbe, event); |
436 | |
437 | return val1 * val2; |
438 | } |
439 | |
440 | static u64 hist_field_unary_minus(struct hist_field *hist_field, |
441 | struct tracing_map_elt *elt, |
442 | struct trace_buffer *buffer, |
443 | struct ring_buffer_event *rbe, |
444 | void *event) |
445 | { |
446 | struct hist_field *operand = hist_field->operands[0]; |
447 | |
448 | s64 sval = (s64)hist_fn_call(hist_field: operand, elt, buffer, rbe, event); |
449 | u64 val = (u64)-sval; |
450 | |
451 | return val; |
452 | } |
453 | |
454 | #define DEFINE_HIST_FIELD_FN(type) \ |
455 | static u64 hist_field_##type(struct hist_field *hist_field, \ |
456 | struct tracing_map_elt *elt, \ |
457 | struct trace_buffer *buffer, \ |
458 | struct ring_buffer_event *rbe, \ |
459 | void *event) \ |
460 | { \ |
461 | type *addr = (type *)(event + hist_field->field->offset); \ |
462 | \ |
463 | return (u64)(unsigned long)*addr; \ |
464 | } |
465 | |
466 | DEFINE_HIST_FIELD_FN(s64); |
467 | DEFINE_HIST_FIELD_FN(u64); |
468 | DEFINE_HIST_FIELD_FN(s32); |
469 | DEFINE_HIST_FIELD_FN(u32); |
470 | DEFINE_HIST_FIELD_FN(s16); |
471 | DEFINE_HIST_FIELD_FN(u16); |
472 | DEFINE_HIST_FIELD_FN(s8); |
473 | DEFINE_HIST_FIELD_FN(u8); |
474 | |
475 | #define for_each_hist_field(i, hist_data) \ |
476 | for ((i) = 0; (i) < (hist_data)->n_fields; (i)++) |
477 | |
478 | #define for_each_hist_val_field(i, hist_data) \ |
479 | for ((i) = 0; (i) < (hist_data)->n_vals; (i)++) |
480 | |
481 | #define for_each_hist_key_field(i, hist_data) \ |
482 | for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++) |
483 | |
484 | #define HITCOUNT_IDX 0 |
485 | #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE) |
486 | |
487 | enum hist_field_flags { |
488 | HIST_FIELD_FL_HITCOUNT = 1 << 0, |
489 | HIST_FIELD_FL_KEY = 1 << 1, |
490 | HIST_FIELD_FL_STRING = 1 << 2, |
491 | HIST_FIELD_FL_HEX = 1 << 3, |
492 | HIST_FIELD_FL_SYM = 1 << 4, |
493 | HIST_FIELD_FL_SYM_OFFSET = 1 << 5, |
494 | HIST_FIELD_FL_EXECNAME = 1 << 6, |
495 | HIST_FIELD_FL_SYSCALL = 1 << 7, |
496 | HIST_FIELD_FL_STACKTRACE = 1 << 8, |
497 | HIST_FIELD_FL_LOG2 = 1 << 9, |
498 | HIST_FIELD_FL_TIMESTAMP = 1 << 10, |
499 | HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11, |
500 | HIST_FIELD_FL_VAR = 1 << 12, |
501 | HIST_FIELD_FL_EXPR = 1 << 13, |
502 | HIST_FIELD_FL_VAR_REF = 1 << 14, |
503 | HIST_FIELD_FL_CPU = 1 << 15, |
504 | HIST_FIELD_FL_ALIAS = 1 << 16, |
505 | HIST_FIELD_FL_BUCKET = 1 << 17, |
506 | HIST_FIELD_FL_CONST = 1 << 18, |
507 | HIST_FIELD_FL_PERCENT = 1 << 19, |
508 | HIST_FIELD_FL_GRAPH = 1 << 20, |
509 | }; |
510 | |
511 | struct var_defs { |
512 | unsigned int n_vars; |
513 | char *name[TRACING_MAP_VARS_MAX]; |
514 | char *expr[TRACING_MAP_VARS_MAX]; |
515 | }; |
516 | |
517 | struct hist_trigger_attrs { |
518 | char *keys_str; |
519 | char *vals_str; |
520 | char *sort_key_str; |
521 | char *name; |
522 | char *clock; |
523 | bool pause; |
524 | bool cont; |
525 | bool clear; |
526 | bool ts_in_usecs; |
527 | bool no_hitcount; |
528 | unsigned int map_bits; |
529 | |
530 | char *assignment_str[TRACING_MAP_VARS_MAX]; |
531 | unsigned int n_assignments; |
532 | |
533 | char *action_str[HIST_ACTIONS_MAX]; |
534 | unsigned int n_actions; |
535 | |
536 | struct var_defs var_defs; |
537 | }; |
538 | |
539 | struct field_var { |
540 | struct hist_field *var; |
541 | struct hist_field *val; |
542 | }; |
543 | |
544 | struct field_var_hist { |
545 | struct hist_trigger_data *hist_data; |
546 | char *cmd; |
547 | }; |
548 | |
549 | struct hist_trigger_data { |
550 | struct hist_field *fields[HIST_FIELDS_MAX]; |
551 | unsigned int n_vals; |
552 | unsigned int n_keys; |
553 | unsigned int n_fields; |
554 | unsigned int n_vars; |
555 | unsigned int n_var_str; |
556 | unsigned int key_size; |
557 | struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX]; |
558 | unsigned int n_sort_keys; |
559 | struct trace_event_file *event_file; |
560 | struct hist_trigger_attrs *attrs; |
561 | struct tracing_map *map; |
562 | bool enable_timestamps; |
563 | bool remove; |
564 | struct hist_field *var_refs[TRACING_MAP_VARS_MAX]; |
565 | unsigned int n_var_refs; |
566 | |
567 | struct action_data *actions[HIST_ACTIONS_MAX]; |
568 | unsigned int n_actions; |
569 | |
570 | struct field_var *field_vars[SYNTH_FIELDS_MAX]; |
571 | unsigned int n_field_vars; |
572 | unsigned int n_field_var_str; |
573 | struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX]; |
574 | unsigned int n_field_var_hists; |
575 | |
576 | struct field_var *save_vars[SYNTH_FIELDS_MAX]; |
577 | unsigned int n_save_vars; |
578 | unsigned int n_save_var_str; |
579 | }; |
580 | |
581 | struct action_data; |
582 | |
583 | typedef void (*action_fn_t) (struct hist_trigger_data *hist_data, |
584 | struct tracing_map_elt *elt, |
585 | struct trace_buffer *buffer, void *rec, |
586 | struct ring_buffer_event *rbe, void *key, |
587 | struct action_data *data, u64 *var_ref_vals); |
588 | |
589 | typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val); |
590 | |
591 | enum handler_id { |
592 | HANDLER_ONMATCH = 1, |
593 | HANDLER_ONMAX, |
594 | HANDLER_ONCHANGE, |
595 | }; |
596 | |
597 | enum action_id { |
598 | ACTION_SAVE = 1, |
599 | ACTION_TRACE, |
600 | ACTION_SNAPSHOT, |
601 | }; |
602 | |
603 | struct action_data { |
604 | enum handler_id handler; |
605 | enum action_id action; |
606 | char *action_name; |
607 | action_fn_t fn; |
608 | |
609 | unsigned int n_params; |
610 | char *params[SYNTH_FIELDS_MAX]; |
611 | |
612 | /* |
613 | * When a histogram trigger is hit, the values of any |
614 | * references to variables, including variables being passed |
615 | * as parameters to synthetic events, are collected into a |
616 | * var_ref_vals array. This var_ref_idx array is an array of |
617 | * indices into the var_ref_vals array, one for each synthetic |
618 | * event param, and is passed to the synthetic event |
619 | * invocation. |
620 | */ |
621 | unsigned int var_ref_idx[SYNTH_FIELDS_MAX]; |
622 | struct synth_event *synth_event; |
623 | bool use_trace_keyword; |
624 | char *synth_event_name; |
625 | |
626 | union { |
627 | struct { |
628 | char *event; |
629 | char *event_system; |
630 | } match_data; |
631 | |
632 | struct { |
633 | /* |
634 | * var_str contains the $-unstripped variable |
635 | * name referenced by var_ref, and used when |
636 | * printing the action. Because var_ref |
637 | * creation is deferred to create_actions(), |
638 | * we need a per-action way to save it until |
639 | * then, thus var_str. |
640 | */ |
641 | char *var_str; |
642 | |
643 | /* |
644 | * var_ref refers to the variable being |
645 | * tracked e.g onmax($var). |
646 | */ |
647 | struct hist_field *var_ref; |
648 | |
649 | /* |
650 | * track_var contains the 'invisible' tracking |
651 | * variable created to keep the current |
652 | * e.g. max value. |
653 | */ |
654 | struct hist_field *track_var; |
655 | |
656 | check_track_val_fn_t check_val; |
657 | action_fn_t save_data; |
658 | } track_data; |
659 | }; |
660 | }; |
661 | |
662 | struct track_data { |
663 | u64 track_val; |
664 | bool updated; |
665 | |
666 | unsigned int key_len; |
667 | void *key; |
668 | struct tracing_map_elt elt; |
669 | |
670 | struct action_data *action_data; |
671 | struct hist_trigger_data *hist_data; |
672 | }; |
673 | |
674 | struct hist_elt_data { |
675 | char *comm; |
676 | u64 *var_ref_vals; |
677 | char **field_var_str; |
678 | int n_field_var_str; |
679 | }; |
680 | |
681 | struct snapshot_context { |
682 | struct tracing_map_elt *elt; |
683 | void *key; |
684 | }; |
685 | |
686 | /* |
687 | * Returns the specific division function to use if the divisor |
688 | * is constant. This avoids extra branches when the trigger is hit. |
689 | */ |
690 | static enum hist_field_fn hist_field_get_div_fn(struct hist_field *divisor) |
691 | { |
692 | u64 div = divisor->constant; |
693 | |
694 | if (!(div & (div - 1))) |
695 | return HIST_FIELD_FN_DIV_POWER2; |
696 | |
697 | /* If the divisor is too large, do a regular division */ |
698 | if (div > (1 << HIST_DIV_SHIFT)) |
699 | return HIST_FIELD_FN_DIV_NOT_POWER2; |
700 | |
701 | divisor->div_multiplier = div64_u64(dividend: (u64)(1 << HIST_DIV_SHIFT), divisor: div); |
702 | return HIST_FIELD_FN_DIV_MULT_SHIFT; |
703 | } |
704 | |
705 | static void track_data_free(struct track_data *track_data) |
706 | { |
707 | struct hist_elt_data *elt_data; |
708 | |
709 | if (!track_data) |
710 | return; |
711 | |
712 | kfree(objp: track_data->key); |
713 | |
714 | elt_data = track_data->elt.private_data; |
715 | if (elt_data) { |
716 | kfree(objp: elt_data->comm); |
717 | kfree(objp: elt_data); |
718 | } |
719 | |
720 | kfree(objp: track_data); |
721 | } |
722 | |
723 | static struct track_data *track_data_alloc(unsigned int key_len, |
724 | struct action_data *action_data, |
725 | struct hist_trigger_data *hist_data) |
726 | { |
727 | struct track_data *data = kzalloc(size: sizeof(*data), GFP_KERNEL); |
728 | struct hist_elt_data *elt_data; |
729 | |
730 | if (!data) |
731 | return ERR_PTR(error: -ENOMEM); |
732 | |
733 | data->key = kzalloc(size: key_len, GFP_KERNEL); |
734 | if (!data->key) { |
735 | track_data_free(track_data: data); |
736 | return ERR_PTR(error: -ENOMEM); |
737 | } |
738 | |
739 | data->key_len = key_len; |
740 | data->action_data = action_data; |
741 | data->hist_data = hist_data; |
742 | |
743 | elt_data = kzalloc(size: sizeof(*elt_data), GFP_KERNEL); |
744 | if (!elt_data) { |
745 | track_data_free(track_data: data); |
746 | return ERR_PTR(error: -ENOMEM); |
747 | } |
748 | |
749 | data->elt.private_data = elt_data; |
750 | |
751 | elt_data->comm = kzalloc(size: TASK_COMM_LEN, GFP_KERNEL); |
752 | if (!elt_data->comm) { |
753 | track_data_free(track_data: data); |
754 | return ERR_PTR(error: -ENOMEM); |
755 | } |
756 | |
757 | return data; |
758 | } |
759 | |
760 | #define HIST_PREFIX "hist:" |
761 | |
762 | static char *last_cmd; |
763 | static char last_cmd_loc[MAX_FILTER_STR_VAL]; |
764 | |
765 | static int errpos(char *str) |
766 | { |
767 | if (!str || !last_cmd) |
768 | return 0; |
769 | |
770 | return err_pos(cmd: last_cmd, str); |
771 | } |
772 | |
773 | static void last_cmd_set(struct trace_event_file *file, char *str) |
774 | { |
775 | const char *system = NULL, *name = NULL; |
776 | struct trace_event_call *call; |
777 | |
778 | if (!str) |
779 | return; |
780 | |
781 | kfree(objp: last_cmd); |
782 | |
783 | last_cmd = kasprintf(GFP_KERNEL, HIST_PREFIX "%s" , str); |
784 | if (!last_cmd) |
785 | return; |
786 | |
787 | if (file) { |
788 | call = file->event_call; |
789 | system = call->class->system; |
790 | if (system) { |
791 | name = trace_event_name(call); |
792 | if (!name) |
793 | system = NULL; |
794 | } |
795 | } |
796 | |
797 | if (system) |
798 | snprintf(buf: last_cmd_loc, MAX_FILTER_STR_VAL, HIST_PREFIX "%s:%s" , system, name); |
799 | } |
800 | |
801 | static void hist_err(struct trace_array *tr, u8 err_type, u16 err_pos) |
802 | { |
803 | if (!last_cmd) |
804 | return; |
805 | |
806 | tracing_log_err(tr, loc: last_cmd_loc, cmd: last_cmd, errs: err_text, |
807 | type: err_type, pos: err_pos); |
808 | } |
809 | |
810 | static void hist_err_clear(void) |
811 | { |
812 | if (last_cmd) |
813 | last_cmd[0] = '\0'; |
814 | last_cmd_loc[0] = '\0'; |
815 | } |
816 | |
817 | typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals, |
818 | unsigned int *var_ref_idx); |
819 | |
820 | static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals, |
821 | unsigned int *var_ref_idx) |
822 | { |
823 | struct tracepoint *tp = event->tp; |
824 | |
825 | if (unlikely(atomic_read(&tp->key.enabled) > 0)) { |
826 | struct tracepoint_func *probe_func_ptr; |
827 | synth_probe_func_t probe_func; |
828 | void *__data; |
829 | |
830 | if (!(cpu_online(raw_smp_processor_id()))) |
831 | return; |
832 | |
833 | probe_func_ptr = rcu_dereference_sched((tp)->funcs); |
834 | if (probe_func_ptr) { |
835 | do { |
836 | probe_func = probe_func_ptr->func; |
837 | __data = probe_func_ptr->data; |
838 | probe_func(__data, var_ref_vals, var_ref_idx); |
839 | } while ((++probe_func_ptr)->func); |
840 | } |
841 | } |
842 | } |
843 | |
844 | static void action_trace(struct hist_trigger_data *hist_data, |
845 | struct tracing_map_elt *elt, |
846 | struct trace_buffer *buffer, void *rec, |
847 | struct ring_buffer_event *rbe, void *key, |
848 | struct action_data *data, u64 *var_ref_vals) |
849 | { |
850 | struct synth_event *event = data->synth_event; |
851 | |
852 | trace_synth(event, var_ref_vals, var_ref_idx: data->var_ref_idx); |
853 | } |
854 | |
855 | struct hist_var_data { |
856 | struct list_head list; |
857 | struct hist_trigger_data *hist_data; |
858 | }; |
859 | |
860 | static u64 hist_field_timestamp(struct hist_field *hist_field, |
861 | struct tracing_map_elt *elt, |
862 | struct trace_buffer *buffer, |
863 | struct ring_buffer_event *rbe, |
864 | void *event) |
865 | { |
866 | struct hist_trigger_data *hist_data = hist_field->hist_data; |
867 | struct trace_array *tr = hist_data->event_file->tr; |
868 | |
869 | u64 ts = ring_buffer_event_time_stamp(buffer, event: rbe); |
870 | |
871 | if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr)) |
872 | ts = ns2usecs(nsec: ts); |
873 | |
874 | return ts; |
875 | } |
876 | |
877 | static u64 hist_field_cpu(struct hist_field *hist_field, |
878 | struct tracing_map_elt *elt, |
879 | struct trace_buffer *buffer, |
880 | struct ring_buffer_event *rbe, |
881 | void *event) |
882 | { |
883 | int cpu = smp_processor_id(); |
884 | |
885 | return cpu; |
886 | } |
887 | |
888 | /** |
889 | * check_field_for_var_ref - Check if a VAR_REF field references a variable |
890 | * @hist_field: The VAR_REF field to check |
891 | * @var_data: The hist trigger that owns the variable |
892 | * @var_idx: The trigger variable identifier |
893 | * |
894 | * Check the given VAR_REF field to see whether or not it references |
895 | * the given variable associated with the given trigger. |
896 | * |
897 | * Return: The VAR_REF field if it does reference the variable, NULL if not |
898 | */ |
899 | static struct hist_field * |
900 | check_field_for_var_ref(struct hist_field *hist_field, |
901 | struct hist_trigger_data *var_data, |
902 | unsigned int var_idx) |
903 | { |
904 | WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF)); |
905 | |
906 | if (hist_field && hist_field->var.idx == var_idx && |
907 | hist_field->var.hist_data == var_data) |
908 | return hist_field; |
909 | |
910 | return NULL; |
911 | } |
912 | |
913 | /** |
914 | * find_var_ref - Check if a trigger has a reference to a trigger variable |
915 | * @hist_data: The hist trigger that might have a reference to the variable |
916 | * @var_data: The hist trigger that owns the variable |
917 | * @var_idx: The trigger variable identifier |
918 | * |
919 | * Check the list of var_refs[] on the first hist trigger to see |
920 | * whether any of them are references to the variable on the second |
921 | * trigger. |
922 | * |
923 | * Return: The VAR_REF field referencing the variable if so, NULL if not |
924 | */ |
925 | static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data, |
926 | struct hist_trigger_data *var_data, |
927 | unsigned int var_idx) |
928 | { |
929 | struct hist_field *hist_field; |
930 | unsigned int i; |
931 | |
932 | for (i = 0; i < hist_data->n_var_refs; i++) { |
933 | hist_field = hist_data->var_refs[i]; |
934 | if (check_field_for_var_ref(hist_field, var_data, var_idx)) |
935 | return hist_field; |
936 | } |
937 | |
938 | return NULL; |
939 | } |
940 | |
941 | /** |
942 | * find_any_var_ref - Check if there is a reference to a given trigger variable |
943 | * @hist_data: The hist trigger |
944 | * @var_idx: The trigger variable identifier |
945 | * |
946 | * Check to see whether the given variable is currently referenced by |
947 | * any other trigger. |
948 | * |
949 | * The trigger the variable is defined on is explicitly excluded - the |
950 | * assumption being that a self-reference doesn't prevent a trigger |
951 | * from being removed. |
952 | * |
953 | * Return: The VAR_REF field referencing the variable if so, NULL if not |
954 | */ |
955 | static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data, |
956 | unsigned int var_idx) |
957 | { |
958 | struct trace_array *tr = hist_data->event_file->tr; |
959 | struct hist_field *found = NULL; |
960 | struct hist_var_data *var_data; |
961 | |
962 | list_for_each_entry(var_data, &tr->hist_vars, list) { |
963 | if (var_data->hist_data == hist_data) |
964 | continue; |
965 | found = find_var_ref(hist_data: var_data->hist_data, var_data: hist_data, var_idx); |
966 | if (found) |
967 | break; |
968 | } |
969 | |
970 | return found; |
971 | } |
972 | |
973 | /** |
974 | * check_var_refs - Check if there is a reference to any of trigger's variables |
975 | * @hist_data: The hist trigger |
976 | * |
977 | * A trigger can define one or more variables. If any one of them is |
978 | * currently referenced by any other trigger, this function will |
979 | * determine that. |
980 | * |
981 | * Typically used to determine whether or not a trigger can be removed |
982 | * - if there are any references to a trigger's variables, it cannot. |
983 | * |
984 | * Return: True if there is a reference to any of trigger's variables |
985 | */ |
986 | static bool check_var_refs(struct hist_trigger_data *hist_data) |
987 | { |
988 | struct hist_field *field; |
989 | bool found = false; |
990 | int i; |
991 | |
992 | for_each_hist_field(i, hist_data) { |
993 | field = hist_data->fields[i]; |
994 | if (field && field->flags & HIST_FIELD_FL_VAR) { |
995 | if (find_any_var_ref(hist_data, var_idx: field->var.idx)) { |
996 | found = true; |
997 | break; |
998 | } |
999 | } |
1000 | } |
1001 | |
1002 | return found; |
1003 | } |
1004 | |
1005 | static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data) |
1006 | { |
1007 | struct trace_array *tr = hist_data->event_file->tr; |
1008 | struct hist_var_data *var_data, *found = NULL; |
1009 | |
1010 | list_for_each_entry(var_data, &tr->hist_vars, list) { |
1011 | if (var_data->hist_data == hist_data) { |
1012 | found = var_data; |
1013 | break; |
1014 | } |
1015 | } |
1016 | |
1017 | return found; |
1018 | } |
1019 | |
1020 | static bool field_has_hist_vars(struct hist_field *hist_field, |
1021 | unsigned int level) |
1022 | { |
1023 | int i; |
1024 | |
1025 | if (level > 3) |
1026 | return false; |
1027 | |
1028 | if (!hist_field) |
1029 | return false; |
1030 | |
1031 | if (hist_field->flags & HIST_FIELD_FL_VAR || |
1032 | hist_field->flags & HIST_FIELD_FL_VAR_REF) |
1033 | return true; |
1034 | |
1035 | for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) { |
1036 | struct hist_field *operand; |
1037 | |
1038 | operand = hist_field->operands[i]; |
1039 | if (field_has_hist_vars(hist_field: operand, level: level + 1)) |
1040 | return true; |
1041 | } |
1042 | |
1043 | return false; |
1044 | } |
1045 | |
1046 | static bool has_hist_vars(struct hist_trigger_data *hist_data) |
1047 | { |
1048 | struct hist_field *hist_field; |
1049 | int i; |
1050 | |
1051 | for_each_hist_field(i, hist_data) { |
1052 | hist_field = hist_data->fields[i]; |
1053 | if (field_has_hist_vars(hist_field, level: 0)) |
1054 | return true; |
1055 | } |
1056 | |
1057 | return false; |
1058 | } |
1059 | |
1060 | static int save_hist_vars(struct hist_trigger_data *hist_data) |
1061 | { |
1062 | struct trace_array *tr = hist_data->event_file->tr; |
1063 | struct hist_var_data *var_data; |
1064 | |
1065 | var_data = find_hist_vars(hist_data); |
1066 | if (var_data) |
1067 | return 0; |
1068 | |
1069 | if (tracing_check_open_get_tr(tr)) |
1070 | return -ENODEV; |
1071 | |
1072 | var_data = kzalloc(size: sizeof(*var_data), GFP_KERNEL); |
1073 | if (!var_data) { |
1074 | trace_array_put(tr); |
1075 | return -ENOMEM; |
1076 | } |
1077 | |
1078 | var_data->hist_data = hist_data; |
1079 | list_add(new: &var_data->list, head: &tr->hist_vars); |
1080 | |
1081 | return 0; |
1082 | } |
1083 | |
1084 | static void remove_hist_vars(struct hist_trigger_data *hist_data) |
1085 | { |
1086 | struct trace_array *tr = hist_data->event_file->tr; |
1087 | struct hist_var_data *var_data; |
1088 | |
1089 | var_data = find_hist_vars(hist_data); |
1090 | if (!var_data) |
1091 | return; |
1092 | |
1093 | if (WARN_ON(check_var_refs(hist_data))) |
1094 | return; |
1095 | |
1096 | list_del(entry: &var_data->list); |
1097 | |
1098 | kfree(objp: var_data); |
1099 | |
1100 | trace_array_put(tr); |
1101 | } |
1102 | |
1103 | static struct hist_field *find_var_field(struct hist_trigger_data *hist_data, |
1104 | const char *var_name) |
1105 | { |
1106 | struct hist_field *hist_field, *found = NULL; |
1107 | int i; |
1108 | |
1109 | for_each_hist_field(i, hist_data) { |
1110 | hist_field = hist_data->fields[i]; |
1111 | if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR && |
1112 | strcmp(hist_field->var.name, var_name) == 0) { |
1113 | found = hist_field; |
1114 | break; |
1115 | } |
1116 | } |
1117 | |
1118 | return found; |
1119 | } |
1120 | |
1121 | static struct hist_field *find_var(struct hist_trigger_data *hist_data, |
1122 | struct trace_event_file *file, |
1123 | const char *var_name) |
1124 | { |
1125 | struct hist_trigger_data *test_data; |
1126 | struct event_trigger_data *test; |
1127 | struct hist_field *hist_field; |
1128 | |
1129 | lockdep_assert_held(&event_mutex); |
1130 | |
1131 | hist_field = find_var_field(hist_data, var_name); |
1132 | if (hist_field) |
1133 | return hist_field; |
1134 | |
1135 | list_for_each_entry(test, &file->triggers, list) { |
1136 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
1137 | test_data = test->private_data; |
1138 | hist_field = find_var_field(hist_data: test_data, var_name); |
1139 | if (hist_field) |
1140 | return hist_field; |
1141 | } |
1142 | } |
1143 | |
1144 | return NULL; |
1145 | } |
1146 | |
1147 | static struct trace_event_file *find_var_file(struct trace_array *tr, |
1148 | char *system, |
1149 | char *event_name, |
1150 | char *var_name) |
1151 | { |
1152 | struct hist_trigger_data *var_hist_data; |
1153 | struct hist_var_data *var_data; |
1154 | struct trace_event_file *file, *found = NULL; |
1155 | |
1156 | if (system) |
1157 | return find_event_file(tr, system, event: event_name); |
1158 | |
1159 | list_for_each_entry(var_data, &tr->hist_vars, list) { |
1160 | var_hist_data = var_data->hist_data; |
1161 | file = var_hist_data->event_file; |
1162 | if (file == found) |
1163 | continue; |
1164 | |
1165 | if (find_var_field(hist_data: var_hist_data, var_name)) { |
1166 | if (found) { |
1167 | hist_err(tr, err_type: HIST_ERR_VAR_NOT_UNIQUE, err_pos: errpos(str: var_name)); |
1168 | return NULL; |
1169 | } |
1170 | |
1171 | found = file; |
1172 | } |
1173 | } |
1174 | |
1175 | return found; |
1176 | } |
1177 | |
1178 | static struct hist_field *find_file_var(struct trace_event_file *file, |
1179 | const char *var_name) |
1180 | { |
1181 | struct hist_trigger_data *test_data; |
1182 | struct event_trigger_data *test; |
1183 | struct hist_field *hist_field; |
1184 | |
1185 | lockdep_assert_held(&event_mutex); |
1186 | |
1187 | list_for_each_entry(test, &file->triggers, list) { |
1188 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
1189 | test_data = test->private_data; |
1190 | hist_field = find_var_field(hist_data: test_data, var_name); |
1191 | if (hist_field) |
1192 | return hist_field; |
1193 | } |
1194 | } |
1195 | |
1196 | return NULL; |
1197 | } |
1198 | |
1199 | static struct hist_field * |
1200 | find_match_var(struct hist_trigger_data *hist_data, char *var_name) |
1201 | { |
1202 | struct trace_array *tr = hist_data->event_file->tr; |
1203 | struct hist_field *hist_field, *found = NULL; |
1204 | struct trace_event_file *file; |
1205 | unsigned int i; |
1206 | |
1207 | for (i = 0; i < hist_data->n_actions; i++) { |
1208 | struct action_data *data = hist_data->actions[i]; |
1209 | |
1210 | if (data->handler == HANDLER_ONMATCH) { |
1211 | char *system = data->match_data.event_system; |
1212 | char *event_name = data->match_data.event; |
1213 | |
1214 | file = find_var_file(tr, system, event_name, var_name); |
1215 | if (!file) |
1216 | continue; |
1217 | hist_field = find_file_var(file, var_name); |
1218 | if (hist_field) { |
1219 | if (found) { |
1220 | hist_err(tr, err_type: HIST_ERR_VAR_NOT_UNIQUE, |
1221 | err_pos: errpos(str: var_name)); |
1222 | return ERR_PTR(error: -EINVAL); |
1223 | } |
1224 | |
1225 | found = hist_field; |
1226 | } |
1227 | } |
1228 | } |
1229 | return found; |
1230 | } |
1231 | |
1232 | static struct hist_field *find_event_var(struct hist_trigger_data *hist_data, |
1233 | char *system, |
1234 | char *event_name, |
1235 | char *var_name) |
1236 | { |
1237 | struct trace_array *tr = hist_data->event_file->tr; |
1238 | struct hist_field *hist_field = NULL; |
1239 | struct trace_event_file *file; |
1240 | |
1241 | if (!system || !event_name) { |
1242 | hist_field = find_match_var(hist_data, var_name); |
1243 | if (IS_ERR(ptr: hist_field)) |
1244 | return NULL; |
1245 | if (hist_field) |
1246 | return hist_field; |
1247 | } |
1248 | |
1249 | file = find_var_file(tr, system, event_name, var_name); |
1250 | if (!file) |
1251 | return NULL; |
1252 | |
1253 | hist_field = find_file_var(file, var_name); |
1254 | |
1255 | return hist_field; |
1256 | } |
1257 | |
1258 | static u64 hist_field_var_ref(struct hist_field *hist_field, |
1259 | struct tracing_map_elt *elt, |
1260 | struct trace_buffer *buffer, |
1261 | struct ring_buffer_event *rbe, |
1262 | void *event) |
1263 | { |
1264 | struct hist_elt_data *elt_data; |
1265 | u64 var_val = 0; |
1266 | |
1267 | if (WARN_ON_ONCE(!elt)) |
1268 | return var_val; |
1269 | |
1270 | elt_data = elt->private_data; |
1271 | var_val = elt_data->var_ref_vals[hist_field->var_ref_idx]; |
1272 | |
1273 | return var_val; |
1274 | } |
1275 | |
1276 | static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key, |
1277 | u64 *var_ref_vals, bool self) |
1278 | { |
1279 | struct hist_trigger_data *var_data; |
1280 | struct tracing_map_elt *var_elt; |
1281 | struct hist_field *hist_field; |
1282 | unsigned int i, var_idx; |
1283 | bool resolved = true; |
1284 | u64 var_val = 0; |
1285 | |
1286 | for (i = 0; i < hist_data->n_var_refs; i++) { |
1287 | hist_field = hist_data->var_refs[i]; |
1288 | var_idx = hist_field->var.idx; |
1289 | var_data = hist_field->var.hist_data; |
1290 | |
1291 | if (var_data == NULL) { |
1292 | resolved = false; |
1293 | break; |
1294 | } |
1295 | |
1296 | if ((self && var_data != hist_data) || |
1297 | (!self && var_data == hist_data)) |
1298 | continue; |
1299 | |
1300 | var_elt = tracing_map_lookup(map: var_data->map, key); |
1301 | if (!var_elt) { |
1302 | resolved = false; |
1303 | break; |
1304 | } |
1305 | |
1306 | if (!tracing_map_var_set(elt: var_elt, i: var_idx)) { |
1307 | resolved = false; |
1308 | break; |
1309 | } |
1310 | |
1311 | if (self || !hist_field->read_once) |
1312 | var_val = tracing_map_read_var(elt: var_elt, i: var_idx); |
1313 | else |
1314 | var_val = tracing_map_read_var_once(elt: var_elt, i: var_idx); |
1315 | |
1316 | var_ref_vals[i] = var_val; |
1317 | } |
1318 | |
1319 | return resolved; |
1320 | } |
1321 | |
1322 | static const char *hist_field_name(struct hist_field *field, |
1323 | unsigned int level) |
1324 | { |
1325 | const char *field_name = "" ; |
1326 | |
1327 | if (WARN_ON_ONCE(!field)) |
1328 | return field_name; |
1329 | |
1330 | if (level > 1) |
1331 | return field_name; |
1332 | |
1333 | if (field->field) |
1334 | field_name = field->field->name; |
1335 | else if (field->flags & HIST_FIELD_FL_LOG2 || |
1336 | field->flags & HIST_FIELD_FL_ALIAS || |
1337 | field->flags & HIST_FIELD_FL_BUCKET) |
1338 | field_name = hist_field_name(field: field->operands[0], level: ++level); |
1339 | else if (field->flags & HIST_FIELD_FL_CPU) |
1340 | field_name = "common_cpu" ; |
1341 | else if (field->flags & HIST_FIELD_FL_EXPR || |
1342 | field->flags & HIST_FIELD_FL_VAR_REF) { |
1343 | if (field->system) { |
1344 | static char full_name[MAX_FILTER_STR_VAL]; |
1345 | |
1346 | strcat(p: full_name, q: field->system); |
1347 | strcat(p: full_name, q: "." ); |
1348 | strcat(p: full_name, q: field->event_name); |
1349 | strcat(p: full_name, q: "." ); |
1350 | strcat(p: full_name, q: field->name); |
1351 | field_name = full_name; |
1352 | } else |
1353 | field_name = field->name; |
1354 | } else if (field->flags & HIST_FIELD_FL_TIMESTAMP) |
1355 | field_name = "common_timestamp" ; |
1356 | else if (field->flags & HIST_FIELD_FL_STACKTRACE) { |
1357 | if (field->field) |
1358 | field_name = field->field->name; |
1359 | else |
1360 | field_name = "common_stacktrace" ; |
1361 | } else if (field->flags & HIST_FIELD_FL_HITCOUNT) |
1362 | field_name = "hitcount" ; |
1363 | |
1364 | if (field_name == NULL) |
1365 | field_name = "" ; |
1366 | |
1367 | return field_name; |
1368 | } |
1369 | |
1370 | static enum hist_field_fn select_value_fn(int field_size, int field_is_signed) |
1371 | { |
1372 | switch (field_size) { |
1373 | case 8: |
1374 | if (field_is_signed) |
1375 | return HIST_FIELD_FN_S64; |
1376 | else |
1377 | return HIST_FIELD_FN_U64; |
1378 | case 4: |
1379 | if (field_is_signed) |
1380 | return HIST_FIELD_FN_S32; |
1381 | else |
1382 | return HIST_FIELD_FN_U32; |
1383 | case 2: |
1384 | if (field_is_signed) |
1385 | return HIST_FIELD_FN_S16; |
1386 | else |
1387 | return HIST_FIELD_FN_U16; |
1388 | case 1: |
1389 | if (field_is_signed) |
1390 | return HIST_FIELD_FN_S8; |
1391 | else |
1392 | return HIST_FIELD_FN_U8; |
1393 | } |
1394 | |
1395 | return HIST_FIELD_FN_NOP; |
1396 | } |
1397 | |
1398 | static int parse_map_size(char *str) |
1399 | { |
1400 | unsigned long size, map_bits; |
1401 | int ret; |
1402 | |
1403 | ret = kstrtoul(s: str, base: 0, res: &size); |
1404 | if (ret) |
1405 | goto out; |
1406 | |
1407 | map_bits = ilog2(roundup_pow_of_two(size)); |
1408 | if (map_bits < TRACING_MAP_BITS_MIN || |
1409 | map_bits > TRACING_MAP_BITS_MAX) |
1410 | ret = -EINVAL; |
1411 | else |
1412 | ret = map_bits; |
1413 | out: |
1414 | return ret; |
1415 | } |
1416 | |
1417 | static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs) |
1418 | { |
1419 | unsigned int i; |
1420 | |
1421 | if (!attrs) |
1422 | return; |
1423 | |
1424 | for (i = 0; i < attrs->n_assignments; i++) |
1425 | kfree(objp: attrs->assignment_str[i]); |
1426 | |
1427 | for (i = 0; i < attrs->n_actions; i++) |
1428 | kfree(objp: attrs->action_str[i]); |
1429 | |
1430 | kfree(objp: attrs->name); |
1431 | kfree(objp: attrs->sort_key_str); |
1432 | kfree(objp: attrs->keys_str); |
1433 | kfree(objp: attrs->vals_str); |
1434 | kfree(objp: attrs->clock); |
1435 | kfree(objp: attrs); |
1436 | } |
1437 | |
1438 | static int parse_action(char *str, struct hist_trigger_attrs *attrs) |
1439 | { |
1440 | int ret = -EINVAL; |
1441 | |
1442 | if (attrs->n_actions >= HIST_ACTIONS_MAX) |
1443 | return ret; |
1444 | |
1445 | if ((str_has_prefix(str, prefix: "onmatch(" )) || |
1446 | (str_has_prefix(str, prefix: "onmax(" )) || |
1447 | (str_has_prefix(str, prefix: "onchange(" ))) { |
1448 | attrs->action_str[attrs->n_actions] = kstrdup(s: str, GFP_KERNEL); |
1449 | if (!attrs->action_str[attrs->n_actions]) { |
1450 | ret = -ENOMEM; |
1451 | return ret; |
1452 | } |
1453 | attrs->n_actions++; |
1454 | ret = 0; |
1455 | } |
1456 | return ret; |
1457 | } |
1458 | |
1459 | static int parse_assignment(struct trace_array *tr, |
1460 | char *str, struct hist_trigger_attrs *attrs) |
1461 | { |
1462 | int len, ret = 0; |
1463 | |
1464 | if ((len = str_has_prefix(str, prefix: "key=" )) || |
1465 | (len = str_has_prefix(str, prefix: "keys=" ))) { |
1466 | attrs->keys_str = kstrdup(s: str + len, GFP_KERNEL); |
1467 | if (!attrs->keys_str) { |
1468 | ret = -ENOMEM; |
1469 | goto out; |
1470 | } |
1471 | } else if ((len = str_has_prefix(str, prefix: "val=" )) || |
1472 | (len = str_has_prefix(str, prefix: "vals=" )) || |
1473 | (len = str_has_prefix(str, prefix: "values=" ))) { |
1474 | attrs->vals_str = kstrdup(s: str + len, GFP_KERNEL); |
1475 | if (!attrs->vals_str) { |
1476 | ret = -ENOMEM; |
1477 | goto out; |
1478 | } |
1479 | } else if ((len = str_has_prefix(str, prefix: "sort=" ))) { |
1480 | attrs->sort_key_str = kstrdup(s: str + len, GFP_KERNEL); |
1481 | if (!attrs->sort_key_str) { |
1482 | ret = -ENOMEM; |
1483 | goto out; |
1484 | } |
1485 | } else if (str_has_prefix(str, prefix: "name=" )) { |
1486 | attrs->name = kstrdup(s: str, GFP_KERNEL); |
1487 | if (!attrs->name) { |
1488 | ret = -ENOMEM; |
1489 | goto out; |
1490 | } |
1491 | } else if ((len = str_has_prefix(str, prefix: "clock=" ))) { |
1492 | str += len; |
1493 | |
1494 | str = strstrip(str); |
1495 | attrs->clock = kstrdup(s: str, GFP_KERNEL); |
1496 | if (!attrs->clock) { |
1497 | ret = -ENOMEM; |
1498 | goto out; |
1499 | } |
1500 | } else if ((len = str_has_prefix(str, prefix: "size=" ))) { |
1501 | int map_bits = parse_map_size(str: str + len); |
1502 | |
1503 | if (map_bits < 0) { |
1504 | ret = map_bits; |
1505 | goto out; |
1506 | } |
1507 | attrs->map_bits = map_bits; |
1508 | } else { |
1509 | char *assignment; |
1510 | |
1511 | if (attrs->n_assignments == TRACING_MAP_VARS_MAX) { |
1512 | hist_err(tr, err_type: HIST_ERR_TOO_MANY_VARS, err_pos: errpos(str)); |
1513 | ret = -EINVAL; |
1514 | goto out; |
1515 | } |
1516 | |
1517 | assignment = kstrdup(s: str, GFP_KERNEL); |
1518 | if (!assignment) { |
1519 | ret = -ENOMEM; |
1520 | goto out; |
1521 | } |
1522 | |
1523 | attrs->assignment_str[attrs->n_assignments++] = assignment; |
1524 | } |
1525 | out: |
1526 | return ret; |
1527 | } |
1528 | |
1529 | static struct hist_trigger_attrs * |
1530 | parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str) |
1531 | { |
1532 | struct hist_trigger_attrs *attrs; |
1533 | int ret = 0; |
1534 | |
1535 | attrs = kzalloc(size: sizeof(*attrs), GFP_KERNEL); |
1536 | if (!attrs) |
1537 | return ERR_PTR(error: -ENOMEM); |
1538 | |
1539 | while (trigger_str) { |
1540 | char *str = strsep(&trigger_str, ":" ); |
1541 | char *rhs; |
1542 | |
1543 | rhs = strchr(str, '='); |
1544 | if (rhs) { |
1545 | if (!strlen(++rhs)) { |
1546 | ret = -EINVAL; |
1547 | hist_err(tr, err_type: HIST_ERR_EMPTY_ASSIGNMENT, err_pos: errpos(str)); |
1548 | goto free; |
1549 | } |
1550 | ret = parse_assignment(tr, str, attrs); |
1551 | if (ret) |
1552 | goto free; |
1553 | } else if (strcmp(str, "nohitcount" ) == 0 || |
1554 | strcmp(str, "NOHC" ) == 0) |
1555 | attrs->no_hitcount = true; |
1556 | else if (strcmp(str, "pause" ) == 0) |
1557 | attrs->pause = true; |
1558 | else if ((strcmp(str, "cont" ) == 0) || |
1559 | (strcmp(str, "continue" ) == 0)) |
1560 | attrs->cont = true; |
1561 | else if (strcmp(str, "clear" ) == 0) |
1562 | attrs->clear = true; |
1563 | else { |
1564 | ret = parse_action(str, attrs); |
1565 | if (ret) |
1566 | goto free; |
1567 | } |
1568 | } |
1569 | |
1570 | if (!attrs->keys_str) { |
1571 | ret = -EINVAL; |
1572 | goto free; |
1573 | } |
1574 | |
1575 | if (!attrs->clock) { |
1576 | attrs->clock = kstrdup(s: "global" , GFP_KERNEL); |
1577 | if (!attrs->clock) { |
1578 | ret = -ENOMEM; |
1579 | goto free; |
1580 | } |
1581 | } |
1582 | |
1583 | return attrs; |
1584 | free: |
1585 | destroy_hist_trigger_attrs(attrs); |
1586 | |
1587 | return ERR_PTR(error: ret); |
1588 | } |
1589 | |
1590 | static inline void save_comm(char *comm, struct task_struct *task) |
1591 | { |
1592 | if (!task->pid) { |
1593 | strcpy(p: comm, q: "<idle>" ); |
1594 | return; |
1595 | } |
1596 | |
1597 | if (WARN_ON_ONCE(task->pid < 0)) { |
1598 | strcpy(p: comm, q: "<XXX>" ); |
1599 | return; |
1600 | } |
1601 | |
1602 | strncpy(p: comm, q: task->comm, size: TASK_COMM_LEN); |
1603 | } |
1604 | |
1605 | static void hist_elt_data_free(struct hist_elt_data *elt_data) |
1606 | { |
1607 | unsigned int i; |
1608 | |
1609 | for (i = 0; i < elt_data->n_field_var_str; i++) |
1610 | kfree(objp: elt_data->field_var_str[i]); |
1611 | |
1612 | kfree(objp: elt_data->field_var_str); |
1613 | |
1614 | kfree(objp: elt_data->comm); |
1615 | kfree(objp: elt_data); |
1616 | } |
1617 | |
1618 | static void hist_trigger_elt_data_free(struct tracing_map_elt *elt) |
1619 | { |
1620 | struct hist_elt_data *elt_data = elt->private_data; |
1621 | |
1622 | hist_elt_data_free(elt_data); |
1623 | } |
1624 | |
1625 | static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt) |
1626 | { |
1627 | struct hist_trigger_data *hist_data = elt->map->private_data; |
1628 | unsigned int size = TASK_COMM_LEN; |
1629 | struct hist_elt_data *elt_data; |
1630 | struct hist_field *hist_field; |
1631 | unsigned int i, n_str; |
1632 | |
1633 | elt_data = kzalloc(size: sizeof(*elt_data), GFP_KERNEL); |
1634 | if (!elt_data) |
1635 | return -ENOMEM; |
1636 | |
1637 | for_each_hist_field(i, hist_data) { |
1638 | hist_field = hist_data->fields[i]; |
1639 | |
1640 | if (hist_field->flags & HIST_FIELD_FL_EXECNAME) { |
1641 | elt_data->comm = kzalloc(size, GFP_KERNEL); |
1642 | if (!elt_data->comm) { |
1643 | kfree(objp: elt_data); |
1644 | return -ENOMEM; |
1645 | } |
1646 | break; |
1647 | } |
1648 | } |
1649 | |
1650 | n_str = hist_data->n_field_var_str + hist_data->n_save_var_str + |
1651 | hist_data->n_var_str; |
1652 | if (n_str > SYNTH_FIELDS_MAX) { |
1653 | hist_elt_data_free(elt_data); |
1654 | return -EINVAL; |
1655 | } |
1656 | |
1657 | BUILD_BUG_ON(STR_VAR_LEN_MAX & (sizeof(u64) - 1)); |
1658 | |
1659 | size = STR_VAR_LEN_MAX; |
1660 | |
1661 | elt_data->field_var_str = kcalloc(n: n_str, size: sizeof(char *), GFP_KERNEL); |
1662 | if (!elt_data->field_var_str) { |
1663 | hist_elt_data_free(elt_data); |
1664 | return -EINVAL; |
1665 | } |
1666 | elt_data->n_field_var_str = n_str; |
1667 | |
1668 | for (i = 0; i < n_str; i++) { |
1669 | elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL); |
1670 | if (!elt_data->field_var_str[i]) { |
1671 | hist_elt_data_free(elt_data); |
1672 | return -ENOMEM; |
1673 | } |
1674 | } |
1675 | |
1676 | elt->private_data = elt_data; |
1677 | |
1678 | return 0; |
1679 | } |
1680 | |
1681 | static void hist_trigger_elt_data_init(struct tracing_map_elt *elt) |
1682 | { |
1683 | struct hist_elt_data *elt_data = elt->private_data; |
1684 | |
1685 | if (elt_data->comm) |
1686 | save_comm(comm: elt_data->comm, current); |
1687 | } |
1688 | |
1689 | static const struct tracing_map_ops hist_trigger_elt_data_ops = { |
1690 | .elt_alloc = hist_trigger_elt_data_alloc, |
1691 | .elt_free = hist_trigger_elt_data_free, |
1692 | .elt_init = hist_trigger_elt_data_init, |
1693 | }; |
1694 | |
1695 | static const char *get_hist_field_flags(struct hist_field *hist_field) |
1696 | { |
1697 | const char *flags_str = NULL; |
1698 | |
1699 | if (hist_field->flags & HIST_FIELD_FL_HEX) |
1700 | flags_str = "hex" ; |
1701 | else if (hist_field->flags & HIST_FIELD_FL_SYM) |
1702 | flags_str = "sym" ; |
1703 | else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET) |
1704 | flags_str = "sym-offset" ; |
1705 | else if (hist_field->flags & HIST_FIELD_FL_EXECNAME) |
1706 | flags_str = "execname" ; |
1707 | else if (hist_field->flags & HIST_FIELD_FL_SYSCALL) |
1708 | flags_str = "syscall" ; |
1709 | else if (hist_field->flags & HIST_FIELD_FL_LOG2) |
1710 | flags_str = "log2" ; |
1711 | else if (hist_field->flags & HIST_FIELD_FL_BUCKET) |
1712 | flags_str = "buckets" ; |
1713 | else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS) |
1714 | flags_str = "usecs" ; |
1715 | else if (hist_field->flags & HIST_FIELD_FL_PERCENT) |
1716 | flags_str = "percent" ; |
1717 | else if (hist_field->flags & HIST_FIELD_FL_GRAPH) |
1718 | flags_str = "graph" ; |
1719 | else if (hist_field->flags & HIST_FIELD_FL_STACKTRACE) |
1720 | flags_str = "stacktrace" ; |
1721 | |
1722 | return flags_str; |
1723 | } |
1724 | |
1725 | static void expr_field_str(struct hist_field *field, char *expr) |
1726 | { |
1727 | if (field->flags & HIST_FIELD_FL_VAR_REF) |
1728 | strcat(p: expr, q: "$" ); |
1729 | else if (field->flags & HIST_FIELD_FL_CONST) { |
1730 | char str[HIST_CONST_DIGITS_MAX]; |
1731 | |
1732 | snprintf(buf: str, HIST_CONST_DIGITS_MAX, fmt: "%llu" , field->constant); |
1733 | strcat(p: expr, q: str); |
1734 | } |
1735 | |
1736 | strcat(p: expr, q: hist_field_name(field, level: 0)); |
1737 | |
1738 | if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) { |
1739 | const char *flags_str = get_hist_field_flags(hist_field: field); |
1740 | |
1741 | if (flags_str) { |
1742 | strcat(p: expr, q: "." ); |
1743 | strcat(p: expr, q: flags_str); |
1744 | } |
1745 | } |
1746 | } |
1747 | |
1748 | static char *expr_str(struct hist_field *field, unsigned int level) |
1749 | { |
1750 | char *expr; |
1751 | |
1752 | if (level > 1) |
1753 | return NULL; |
1754 | |
1755 | expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); |
1756 | if (!expr) |
1757 | return NULL; |
1758 | |
1759 | if (!field->operands[0]) { |
1760 | expr_field_str(field, expr); |
1761 | return expr; |
1762 | } |
1763 | |
1764 | if (field->operator == FIELD_OP_UNARY_MINUS) { |
1765 | char *subexpr; |
1766 | |
1767 | strcat(p: expr, q: "-(" ); |
1768 | subexpr = expr_str(field: field->operands[0], level: ++level); |
1769 | if (!subexpr) { |
1770 | kfree(objp: expr); |
1771 | return NULL; |
1772 | } |
1773 | strcat(p: expr, q: subexpr); |
1774 | strcat(p: expr, q: ")" ); |
1775 | |
1776 | kfree(objp: subexpr); |
1777 | |
1778 | return expr; |
1779 | } |
1780 | |
1781 | expr_field_str(field: field->operands[0], expr); |
1782 | |
1783 | switch (field->operator) { |
1784 | case FIELD_OP_MINUS: |
1785 | strcat(p: expr, q: "-" ); |
1786 | break; |
1787 | case FIELD_OP_PLUS: |
1788 | strcat(p: expr, q: "+" ); |
1789 | break; |
1790 | case FIELD_OP_DIV: |
1791 | strcat(p: expr, q: "/" ); |
1792 | break; |
1793 | case FIELD_OP_MULT: |
1794 | strcat(p: expr, q: "*" ); |
1795 | break; |
1796 | default: |
1797 | kfree(objp: expr); |
1798 | return NULL; |
1799 | } |
1800 | |
1801 | expr_field_str(field: field->operands[1], expr); |
1802 | |
1803 | return expr; |
1804 | } |
1805 | |
1806 | /* |
1807 | * If field_op != FIELD_OP_NONE, *sep points to the root operator |
1808 | * of the expression tree to be evaluated. |
1809 | */ |
1810 | static int contains_operator(char *str, char **sep) |
1811 | { |
1812 | enum field_op_id field_op = FIELD_OP_NONE; |
1813 | char *minus_op, *plus_op, *div_op, *mult_op; |
1814 | |
1815 | |
1816 | /* |
1817 | * Report the last occurrence of the operators first, so that the |
1818 | * expression is evaluated left to right. This is important since |
1819 | * subtraction and division are not associative. |
1820 | * |
1821 | * e.g |
1822 | * 64/8/4/2 is 1, i.e 64/8/4/2 = ((64/8)/4)/2 |
1823 | * 14-7-5-2 is 0, i.e 14-7-5-2 = ((14-7)-5)-2 |
1824 | */ |
1825 | |
1826 | /* |
1827 | * First, find lower precedence addition and subtraction |
1828 | * since the expression will be evaluated recursively. |
1829 | */ |
1830 | minus_op = strrchr(str, '-'); |
1831 | if (minus_op) { |
1832 | /* |
1833 | * Unary minus is not supported in sub-expressions. If |
1834 | * present, it is always the next root operator. |
1835 | */ |
1836 | if (minus_op == str) { |
1837 | field_op = FIELD_OP_UNARY_MINUS; |
1838 | goto out; |
1839 | } |
1840 | |
1841 | field_op = FIELD_OP_MINUS; |
1842 | } |
1843 | |
1844 | plus_op = strrchr(str, '+'); |
1845 | if (plus_op || minus_op) { |
1846 | /* |
1847 | * For operators of the same precedence use to rightmost as the |
1848 | * root, so that the expression is evaluated left to right. |
1849 | */ |
1850 | if (plus_op > minus_op) |
1851 | field_op = FIELD_OP_PLUS; |
1852 | goto out; |
1853 | } |
1854 | |
1855 | /* |
1856 | * Multiplication and division have higher precedence than addition and |
1857 | * subtraction. |
1858 | */ |
1859 | div_op = strrchr(str, '/'); |
1860 | if (div_op) |
1861 | field_op = FIELD_OP_DIV; |
1862 | |
1863 | mult_op = strrchr(str, '*'); |
1864 | /* |
1865 | * For operators of the same precedence use to rightmost as the |
1866 | * root, so that the expression is evaluated left to right. |
1867 | */ |
1868 | if (mult_op > div_op) |
1869 | field_op = FIELD_OP_MULT; |
1870 | |
1871 | out: |
1872 | if (sep) { |
1873 | switch (field_op) { |
1874 | case FIELD_OP_UNARY_MINUS: |
1875 | case FIELD_OP_MINUS: |
1876 | *sep = minus_op; |
1877 | break; |
1878 | case FIELD_OP_PLUS: |
1879 | *sep = plus_op; |
1880 | break; |
1881 | case FIELD_OP_DIV: |
1882 | *sep = div_op; |
1883 | break; |
1884 | case FIELD_OP_MULT: |
1885 | *sep = mult_op; |
1886 | break; |
1887 | case FIELD_OP_NONE: |
1888 | default: |
1889 | *sep = NULL; |
1890 | break; |
1891 | } |
1892 | } |
1893 | |
1894 | return field_op; |
1895 | } |
1896 | |
1897 | static void get_hist_field(struct hist_field *hist_field) |
1898 | { |
1899 | hist_field->ref++; |
1900 | } |
1901 | |
1902 | static void __destroy_hist_field(struct hist_field *hist_field) |
1903 | { |
1904 | if (--hist_field->ref > 1) |
1905 | return; |
1906 | |
1907 | kfree(objp: hist_field->var.name); |
1908 | kfree(objp: hist_field->name); |
1909 | |
1910 | /* Can likely be a const */ |
1911 | kfree_const(x: hist_field->type); |
1912 | |
1913 | kfree(objp: hist_field->system); |
1914 | kfree(objp: hist_field->event_name); |
1915 | |
1916 | kfree(objp: hist_field); |
1917 | } |
1918 | |
1919 | static void destroy_hist_field(struct hist_field *hist_field, |
1920 | unsigned int level) |
1921 | { |
1922 | unsigned int i; |
1923 | |
1924 | if (level > 3) |
1925 | return; |
1926 | |
1927 | if (!hist_field) |
1928 | return; |
1929 | |
1930 | if (hist_field->flags & HIST_FIELD_FL_VAR_REF) |
1931 | return; /* var refs will be destroyed separately */ |
1932 | |
1933 | for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) |
1934 | destroy_hist_field(hist_field: hist_field->operands[i], level: level + 1); |
1935 | |
1936 | __destroy_hist_field(hist_field); |
1937 | } |
1938 | |
1939 | static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data, |
1940 | struct ftrace_event_field *field, |
1941 | unsigned long flags, |
1942 | char *var_name) |
1943 | { |
1944 | struct hist_field *hist_field; |
1945 | |
1946 | if (field && is_function_field(field)) |
1947 | return NULL; |
1948 | |
1949 | hist_field = kzalloc(size: sizeof(struct hist_field), GFP_KERNEL); |
1950 | if (!hist_field) |
1951 | return NULL; |
1952 | |
1953 | hist_field->ref = 1; |
1954 | |
1955 | hist_field->hist_data = hist_data; |
1956 | |
1957 | if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS) |
1958 | goto out; /* caller will populate */ |
1959 | |
1960 | if (flags & HIST_FIELD_FL_VAR_REF) { |
1961 | hist_field->fn_num = HIST_FIELD_FN_VAR_REF; |
1962 | goto out; |
1963 | } |
1964 | |
1965 | if (flags & HIST_FIELD_FL_HITCOUNT) { |
1966 | hist_field->fn_num = HIST_FIELD_FN_COUNTER; |
1967 | hist_field->size = sizeof(u64); |
1968 | hist_field->type = "u64" ; |
1969 | goto out; |
1970 | } |
1971 | |
1972 | if (flags & HIST_FIELD_FL_CONST) { |
1973 | hist_field->fn_num = HIST_FIELD_FN_CONST; |
1974 | hist_field->size = sizeof(u64); |
1975 | hist_field->type = kstrdup(s: "u64" , GFP_KERNEL); |
1976 | if (!hist_field->type) |
1977 | goto free; |
1978 | goto out; |
1979 | } |
1980 | |
1981 | if (flags & HIST_FIELD_FL_STACKTRACE) { |
1982 | if (field) |
1983 | hist_field->fn_num = HIST_FIELD_FN_STACK; |
1984 | else |
1985 | hist_field->fn_num = HIST_FIELD_FN_NOP; |
1986 | hist_field->size = HIST_STACKTRACE_SIZE; |
1987 | hist_field->type = kstrdup_const(s: "unsigned long[]" , GFP_KERNEL); |
1988 | if (!hist_field->type) |
1989 | goto free; |
1990 | goto out; |
1991 | } |
1992 | |
1993 | if (flags & (HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET)) { |
1994 | unsigned long fl = flags & ~(HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET); |
1995 | hist_field->fn_num = flags & HIST_FIELD_FL_LOG2 ? HIST_FIELD_FN_LOG2 : |
1996 | HIST_FIELD_FN_BUCKET; |
1997 | hist_field->operands[0] = create_hist_field(hist_data, field, flags: fl, NULL); |
1998 | if (!hist_field->operands[0]) |
1999 | goto free; |
2000 | hist_field->size = hist_field->operands[0]->size; |
2001 | hist_field->type = kstrdup_const(s: hist_field->operands[0]->type, GFP_KERNEL); |
2002 | if (!hist_field->type) |
2003 | goto free; |
2004 | goto out; |
2005 | } |
2006 | |
2007 | if (flags & HIST_FIELD_FL_TIMESTAMP) { |
2008 | hist_field->fn_num = HIST_FIELD_FN_TIMESTAMP; |
2009 | hist_field->size = sizeof(u64); |
2010 | hist_field->type = "u64" ; |
2011 | goto out; |
2012 | } |
2013 | |
2014 | if (flags & HIST_FIELD_FL_CPU) { |
2015 | hist_field->fn_num = HIST_FIELD_FN_CPU; |
2016 | hist_field->size = sizeof(int); |
2017 | hist_field->type = "unsigned int" ; |
2018 | goto out; |
2019 | } |
2020 | |
2021 | if (WARN_ON_ONCE(!field)) |
2022 | goto out; |
2023 | |
2024 | /* Pointers to strings are just pointers and dangerous to dereference */ |
2025 | if (is_string_field(field) && |
2026 | (field->filter_type != FILTER_PTR_STRING)) { |
2027 | flags |= HIST_FIELD_FL_STRING; |
2028 | |
2029 | hist_field->size = MAX_FILTER_STR_VAL; |
2030 | hist_field->type = kstrdup_const(s: field->type, GFP_KERNEL); |
2031 | if (!hist_field->type) |
2032 | goto free; |
2033 | |
2034 | if (field->filter_type == FILTER_STATIC_STRING) { |
2035 | hist_field->fn_num = HIST_FIELD_FN_STRING; |
2036 | hist_field->size = field->size; |
2037 | } else if (field->filter_type == FILTER_DYN_STRING) { |
2038 | hist_field->fn_num = HIST_FIELD_FN_DYNSTRING; |
2039 | } else if (field->filter_type == FILTER_RDYN_STRING) |
2040 | hist_field->fn_num = HIST_FIELD_FN_RELDYNSTRING; |
2041 | else |
2042 | hist_field->fn_num = HIST_FIELD_FN_PSTRING; |
2043 | } else { |
2044 | hist_field->size = field->size; |
2045 | hist_field->is_signed = field->is_signed; |
2046 | hist_field->type = kstrdup_const(s: field->type, GFP_KERNEL); |
2047 | if (!hist_field->type) |
2048 | goto free; |
2049 | |
2050 | hist_field->fn_num = select_value_fn(field_size: field->size, |
2051 | field_is_signed: field->is_signed); |
2052 | if (hist_field->fn_num == HIST_FIELD_FN_NOP) { |
2053 | destroy_hist_field(hist_field, level: 0); |
2054 | return NULL; |
2055 | } |
2056 | } |
2057 | out: |
2058 | hist_field->field = field; |
2059 | hist_field->flags = flags; |
2060 | |
2061 | if (var_name) { |
2062 | hist_field->var.name = kstrdup(s: var_name, GFP_KERNEL); |
2063 | if (!hist_field->var.name) |
2064 | goto free; |
2065 | } |
2066 | |
2067 | return hist_field; |
2068 | free: |
2069 | destroy_hist_field(hist_field, level: 0); |
2070 | return NULL; |
2071 | } |
2072 | |
2073 | static void destroy_hist_fields(struct hist_trigger_data *hist_data) |
2074 | { |
2075 | unsigned int i; |
2076 | |
2077 | for (i = 0; i < HIST_FIELDS_MAX; i++) { |
2078 | if (hist_data->fields[i]) { |
2079 | destroy_hist_field(hist_field: hist_data->fields[i], level: 0); |
2080 | hist_data->fields[i] = NULL; |
2081 | } |
2082 | } |
2083 | |
2084 | for (i = 0; i < hist_data->n_var_refs; i++) { |
2085 | WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF)); |
2086 | __destroy_hist_field(hist_field: hist_data->var_refs[i]); |
2087 | hist_data->var_refs[i] = NULL; |
2088 | } |
2089 | } |
2090 | |
2091 | static int init_var_ref(struct hist_field *ref_field, |
2092 | struct hist_field *var_field, |
2093 | char *system, char *event_name) |
2094 | { |
2095 | int err = 0; |
2096 | |
2097 | ref_field->var.idx = var_field->var.idx; |
2098 | ref_field->var.hist_data = var_field->hist_data; |
2099 | ref_field->size = var_field->size; |
2100 | ref_field->is_signed = var_field->is_signed; |
2101 | ref_field->flags |= var_field->flags & |
2102 | (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); |
2103 | |
2104 | if (system) { |
2105 | ref_field->system = kstrdup(s: system, GFP_KERNEL); |
2106 | if (!ref_field->system) |
2107 | return -ENOMEM; |
2108 | } |
2109 | |
2110 | if (event_name) { |
2111 | ref_field->event_name = kstrdup(s: event_name, GFP_KERNEL); |
2112 | if (!ref_field->event_name) { |
2113 | err = -ENOMEM; |
2114 | goto free; |
2115 | } |
2116 | } |
2117 | |
2118 | if (var_field->var.name) { |
2119 | ref_field->name = kstrdup(s: var_field->var.name, GFP_KERNEL); |
2120 | if (!ref_field->name) { |
2121 | err = -ENOMEM; |
2122 | goto free; |
2123 | } |
2124 | } else if (var_field->name) { |
2125 | ref_field->name = kstrdup(s: var_field->name, GFP_KERNEL); |
2126 | if (!ref_field->name) { |
2127 | err = -ENOMEM; |
2128 | goto free; |
2129 | } |
2130 | } |
2131 | |
2132 | ref_field->type = kstrdup_const(s: var_field->type, GFP_KERNEL); |
2133 | if (!ref_field->type) { |
2134 | err = -ENOMEM; |
2135 | goto free; |
2136 | } |
2137 | out: |
2138 | return err; |
2139 | free: |
2140 | kfree(objp: ref_field->system); |
2141 | ref_field->system = NULL; |
2142 | kfree(objp: ref_field->event_name); |
2143 | ref_field->event_name = NULL; |
2144 | kfree(objp: ref_field->name); |
2145 | ref_field->name = NULL; |
2146 | |
2147 | goto out; |
2148 | } |
2149 | |
2150 | static int find_var_ref_idx(struct hist_trigger_data *hist_data, |
2151 | struct hist_field *var_field) |
2152 | { |
2153 | struct hist_field *ref_field; |
2154 | int i; |
2155 | |
2156 | for (i = 0; i < hist_data->n_var_refs; i++) { |
2157 | ref_field = hist_data->var_refs[i]; |
2158 | if (ref_field->var.idx == var_field->var.idx && |
2159 | ref_field->var.hist_data == var_field->hist_data) |
2160 | return i; |
2161 | } |
2162 | |
2163 | return -ENOENT; |
2164 | } |
2165 | |
2166 | /** |
2167 | * create_var_ref - Create a variable reference and attach it to trigger |
2168 | * @hist_data: The trigger that will be referencing the variable |
2169 | * @var_field: The VAR field to create a reference to |
2170 | * @system: The optional system string |
2171 | * @event_name: The optional event_name string |
2172 | * |
2173 | * Given a variable hist_field, create a VAR_REF hist_field that |
2174 | * represents a reference to it. |
2175 | * |
2176 | * This function also adds the reference to the trigger that |
2177 | * now references the variable. |
2178 | * |
2179 | * Return: The VAR_REF field if successful, NULL if not |
2180 | */ |
2181 | static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data, |
2182 | struct hist_field *var_field, |
2183 | char *system, char *event_name) |
2184 | { |
2185 | unsigned long flags = HIST_FIELD_FL_VAR_REF; |
2186 | struct hist_field *ref_field; |
2187 | int i; |
2188 | |
2189 | /* Check if the variable already exists */ |
2190 | for (i = 0; i < hist_data->n_var_refs; i++) { |
2191 | ref_field = hist_data->var_refs[i]; |
2192 | if (ref_field->var.idx == var_field->var.idx && |
2193 | ref_field->var.hist_data == var_field->hist_data) { |
2194 | get_hist_field(hist_field: ref_field); |
2195 | return ref_field; |
2196 | } |
2197 | } |
2198 | /* Sanity check to avoid out-of-bound write on 'hist_data->var_refs' */ |
2199 | if (hist_data->n_var_refs >= TRACING_MAP_VARS_MAX) |
2200 | return NULL; |
2201 | ref_field = create_hist_field(hist_data: var_field->hist_data, NULL, flags, NULL); |
2202 | if (ref_field) { |
2203 | if (init_var_ref(ref_field, var_field, system, event_name)) { |
2204 | destroy_hist_field(hist_field: ref_field, level: 0); |
2205 | return NULL; |
2206 | } |
2207 | |
2208 | hist_data->var_refs[hist_data->n_var_refs] = ref_field; |
2209 | ref_field->var_ref_idx = hist_data->n_var_refs++; |
2210 | } |
2211 | |
2212 | return ref_field; |
2213 | } |
2214 | |
2215 | static bool is_var_ref(char *var_name) |
2216 | { |
2217 | if (!var_name || strlen(var_name) < 2 || var_name[0] != '$') |
2218 | return false; |
2219 | |
2220 | return true; |
2221 | } |
2222 | |
2223 | static char *field_name_from_var(struct hist_trigger_data *hist_data, |
2224 | char *var_name) |
2225 | { |
2226 | char *name, *field; |
2227 | unsigned int i; |
2228 | |
2229 | for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { |
2230 | name = hist_data->attrs->var_defs.name[i]; |
2231 | |
2232 | if (strcmp(var_name, name) == 0) { |
2233 | field = hist_data->attrs->var_defs.expr[i]; |
2234 | if (contains_operator(str: field, NULL) || is_var_ref(var_name: field)) |
2235 | continue; |
2236 | return field; |
2237 | } |
2238 | } |
2239 | |
2240 | return NULL; |
2241 | } |
2242 | |
2243 | static char *local_field_var_ref(struct hist_trigger_data *hist_data, |
2244 | char *system, char *event_name, |
2245 | char *var_name) |
2246 | { |
2247 | struct trace_event_call *call; |
2248 | |
2249 | if (system && event_name) { |
2250 | call = hist_data->event_file->event_call; |
2251 | |
2252 | if (strcmp(system, call->class->system) != 0) |
2253 | return NULL; |
2254 | |
2255 | if (strcmp(event_name, trace_event_name(call)) != 0) |
2256 | return NULL; |
2257 | } |
2258 | |
2259 | if (!!system != !!event_name) |
2260 | return NULL; |
2261 | |
2262 | if (!is_var_ref(var_name)) |
2263 | return NULL; |
2264 | |
2265 | var_name++; |
2266 | |
2267 | return field_name_from_var(hist_data, var_name); |
2268 | } |
2269 | |
2270 | static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data, |
2271 | char *system, char *event_name, |
2272 | char *var_name) |
2273 | { |
2274 | struct hist_field *var_field = NULL, *ref_field = NULL; |
2275 | struct trace_array *tr = hist_data->event_file->tr; |
2276 | |
2277 | if (!is_var_ref(var_name)) |
2278 | return NULL; |
2279 | |
2280 | var_name++; |
2281 | |
2282 | var_field = find_event_var(hist_data, system, event_name, var_name); |
2283 | if (var_field) |
2284 | ref_field = create_var_ref(hist_data, var_field, |
2285 | system, event_name); |
2286 | |
2287 | if (!ref_field) |
2288 | hist_err(tr, err_type: HIST_ERR_VAR_NOT_FOUND, err_pos: errpos(str: var_name)); |
2289 | |
2290 | return ref_field; |
2291 | } |
2292 | |
2293 | static struct ftrace_event_field * |
2294 | parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file, |
2295 | char *field_str, unsigned long *flags, unsigned long *buckets) |
2296 | { |
2297 | struct ftrace_event_field *field = NULL; |
2298 | char *field_name, *modifier, *str; |
2299 | struct trace_array *tr = file->tr; |
2300 | |
2301 | modifier = str = kstrdup(s: field_str, GFP_KERNEL); |
2302 | if (!modifier) |
2303 | return ERR_PTR(error: -ENOMEM); |
2304 | |
2305 | field_name = strsep(&modifier, "." ); |
2306 | if (modifier) { |
2307 | if (strcmp(modifier, "hex" ) == 0) |
2308 | *flags |= HIST_FIELD_FL_HEX; |
2309 | else if (strcmp(modifier, "sym" ) == 0) |
2310 | *flags |= HIST_FIELD_FL_SYM; |
2311 | /* |
2312 | * 'sym-offset' occurrences in the trigger string are modified |
2313 | * to 'symXoffset' to simplify arithmetic expression parsing. |
2314 | */ |
2315 | else if (strcmp(modifier, "symXoffset" ) == 0) |
2316 | *flags |= HIST_FIELD_FL_SYM_OFFSET; |
2317 | else if ((strcmp(modifier, "execname" ) == 0) && |
2318 | (strcmp(field_name, "common_pid" ) == 0)) |
2319 | *flags |= HIST_FIELD_FL_EXECNAME; |
2320 | else if (strcmp(modifier, "syscall" ) == 0) |
2321 | *flags |= HIST_FIELD_FL_SYSCALL; |
2322 | else if (strcmp(modifier, "stacktrace" ) == 0) |
2323 | *flags |= HIST_FIELD_FL_STACKTRACE; |
2324 | else if (strcmp(modifier, "log2" ) == 0) |
2325 | *flags |= HIST_FIELD_FL_LOG2; |
2326 | else if (strcmp(modifier, "usecs" ) == 0) |
2327 | *flags |= HIST_FIELD_FL_TIMESTAMP_USECS; |
2328 | else if (strncmp(modifier, "bucket" , 6) == 0) { |
2329 | int ret; |
2330 | |
2331 | modifier += 6; |
2332 | |
2333 | if (*modifier == 's') |
2334 | modifier++; |
2335 | if (*modifier != '=') |
2336 | goto error; |
2337 | modifier++; |
2338 | ret = kstrtoul(s: modifier, base: 0, res: buckets); |
2339 | if (ret || !(*buckets)) |
2340 | goto error; |
2341 | *flags |= HIST_FIELD_FL_BUCKET; |
2342 | } else if (strncmp(modifier, "percent" , 7) == 0) { |
2343 | if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY)) |
2344 | goto error; |
2345 | *flags |= HIST_FIELD_FL_PERCENT; |
2346 | } else if (strncmp(modifier, "graph" , 5) == 0) { |
2347 | if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY)) |
2348 | goto error; |
2349 | *flags |= HIST_FIELD_FL_GRAPH; |
2350 | } else { |
2351 | error: |
2352 | hist_err(tr, err_type: HIST_ERR_BAD_FIELD_MODIFIER, err_pos: errpos(str: modifier)); |
2353 | field = ERR_PTR(error: -EINVAL); |
2354 | goto out; |
2355 | } |
2356 | } |
2357 | |
2358 | if (strcmp(field_name, "common_timestamp" ) == 0) { |
2359 | *flags |= HIST_FIELD_FL_TIMESTAMP; |
2360 | hist_data->enable_timestamps = true; |
2361 | if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS) |
2362 | hist_data->attrs->ts_in_usecs = true; |
2363 | } else if (strcmp(field_name, "common_stacktrace" ) == 0) { |
2364 | *flags |= HIST_FIELD_FL_STACKTRACE; |
2365 | } else if (strcmp(field_name, "common_cpu" ) == 0) |
2366 | *flags |= HIST_FIELD_FL_CPU; |
2367 | else if (strcmp(field_name, "hitcount" ) == 0) |
2368 | *flags |= HIST_FIELD_FL_HITCOUNT; |
2369 | else { |
2370 | field = trace_find_event_field(call: file->event_call, name: field_name); |
2371 | if (!field || !field->size) { |
2372 | /* |
2373 | * For backward compatibility, if field_name |
2374 | * was "cpu" or "stacktrace", then we treat this |
2375 | * the same as common_cpu and common_stacktrace |
2376 | * respectively. This also works for "CPU", and |
2377 | * "STACKTRACE". |
2378 | */ |
2379 | if (field && field->filter_type == FILTER_CPU) { |
2380 | *flags |= HIST_FIELD_FL_CPU; |
2381 | } else if (field && field->filter_type == FILTER_STACKTRACE) { |
2382 | *flags |= HIST_FIELD_FL_STACKTRACE; |
2383 | } else { |
2384 | hist_err(tr, err_type: HIST_ERR_FIELD_NOT_FOUND, |
2385 | err_pos: errpos(str: field_name)); |
2386 | field = ERR_PTR(error: -EINVAL); |
2387 | goto out; |
2388 | } |
2389 | } |
2390 | } |
2391 | out: |
2392 | kfree(objp: str); |
2393 | |
2394 | return field; |
2395 | } |
2396 | |
2397 | static struct hist_field *create_alias(struct hist_trigger_data *hist_data, |
2398 | struct hist_field *var_ref, |
2399 | char *var_name) |
2400 | { |
2401 | struct hist_field *alias = NULL; |
2402 | unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR; |
2403 | |
2404 | alias = create_hist_field(hist_data, NULL, flags, var_name); |
2405 | if (!alias) |
2406 | return NULL; |
2407 | |
2408 | alias->fn_num = var_ref->fn_num; |
2409 | alias->operands[0] = var_ref; |
2410 | |
2411 | if (init_var_ref(ref_field: alias, var_field: var_ref, system: var_ref->system, event_name: var_ref->event_name)) { |
2412 | destroy_hist_field(hist_field: alias, level: 0); |
2413 | return NULL; |
2414 | } |
2415 | |
2416 | alias->var_ref_idx = var_ref->var_ref_idx; |
2417 | |
2418 | return alias; |
2419 | } |
2420 | |
2421 | static struct hist_field *parse_const(struct hist_trigger_data *hist_data, |
2422 | char *str, char *var_name, |
2423 | unsigned long *flags) |
2424 | { |
2425 | struct trace_array *tr = hist_data->event_file->tr; |
2426 | struct hist_field *field = NULL; |
2427 | u64 constant; |
2428 | |
2429 | if (kstrtoull(s: str, base: 0, res: &constant)) { |
2430 | hist_err(tr, err_type: HIST_ERR_EXPECT_NUMBER, err_pos: errpos(str)); |
2431 | return NULL; |
2432 | } |
2433 | |
2434 | *flags |= HIST_FIELD_FL_CONST; |
2435 | field = create_hist_field(hist_data, NULL, flags: *flags, var_name); |
2436 | if (!field) |
2437 | return NULL; |
2438 | |
2439 | field->constant = constant; |
2440 | |
2441 | return field; |
2442 | } |
2443 | |
2444 | static struct hist_field *parse_atom(struct hist_trigger_data *hist_data, |
2445 | struct trace_event_file *file, char *str, |
2446 | unsigned long *flags, char *var_name) |
2447 | { |
2448 | char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str; |
2449 | struct ftrace_event_field *field = NULL; |
2450 | struct hist_field *hist_field = NULL; |
2451 | unsigned long buckets = 0; |
2452 | int ret = 0; |
2453 | |
2454 | if (isdigit(c: str[0])) { |
2455 | hist_field = parse_const(hist_data, str, var_name, flags); |
2456 | if (!hist_field) { |
2457 | ret = -EINVAL; |
2458 | goto out; |
2459 | } |
2460 | return hist_field; |
2461 | } |
2462 | |
2463 | s = strchr(str, '.'); |
2464 | if (s) { |
2465 | s = strchr(++s, '.'); |
2466 | if (s) { |
2467 | ref_system = strsep(&str, "." ); |
2468 | if (!str) { |
2469 | ret = -EINVAL; |
2470 | goto out; |
2471 | } |
2472 | ref_event = strsep(&str, "." ); |
2473 | if (!str) { |
2474 | ret = -EINVAL; |
2475 | goto out; |
2476 | } |
2477 | ref_var = str; |
2478 | } |
2479 | } |
2480 | |
2481 | s = local_field_var_ref(hist_data, system: ref_system, event_name: ref_event, var_name: ref_var); |
2482 | if (!s) { |
2483 | hist_field = parse_var_ref(hist_data, system: ref_system, |
2484 | event_name: ref_event, var_name: ref_var); |
2485 | if (hist_field) { |
2486 | if (var_name) { |
2487 | hist_field = create_alias(hist_data, var_ref: hist_field, var_name); |
2488 | if (!hist_field) { |
2489 | ret = -ENOMEM; |
2490 | goto out; |
2491 | } |
2492 | } |
2493 | return hist_field; |
2494 | } |
2495 | } else |
2496 | str = s; |
2497 | |
2498 | field = parse_field(hist_data, file, field_str: str, flags, buckets: &buckets); |
2499 | if (IS_ERR(ptr: field)) { |
2500 | ret = PTR_ERR(ptr: field); |
2501 | goto out; |
2502 | } |
2503 | |
2504 | hist_field = create_hist_field(hist_data, field, flags: *flags, var_name); |
2505 | if (!hist_field) { |
2506 | ret = -ENOMEM; |
2507 | goto out; |
2508 | } |
2509 | hist_field->buckets = buckets; |
2510 | |
2511 | return hist_field; |
2512 | out: |
2513 | return ERR_PTR(error: ret); |
2514 | } |
2515 | |
2516 | static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, |
2517 | struct trace_event_file *file, |
2518 | char *str, unsigned long flags, |
2519 | char *var_name, unsigned int *n_subexprs); |
2520 | |
2521 | static struct hist_field *parse_unary(struct hist_trigger_data *hist_data, |
2522 | struct trace_event_file *file, |
2523 | char *str, unsigned long flags, |
2524 | char *var_name, unsigned int *n_subexprs) |
2525 | { |
2526 | struct hist_field *operand1, *expr = NULL; |
2527 | unsigned long operand_flags; |
2528 | int ret = 0; |
2529 | char *s; |
2530 | |
2531 | /* Unary minus operator, increment n_subexprs */ |
2532 | ++*n_subexprs; |
2533 | |
2534 | /* we support only -(xxx) i.e. explicit parens required */ |
2535 | |
2536 | if (*n_subexprs > 3) { |
2537 | hist_err(tr: file->tr, err_type: HIST_ERR_TOO_MANY_SUBEXPR, err_pos: errpos(str)); |
2538 | ret = -EINVAL; |
2539 | goto free; |
2540 | } |
2541 | |
2542 | str++; /* skip leading '-' */ |
2543 | |
2544 | s = strchr(str, '('); |
2545 | if (s) |
2546 | str++; |
2547 | else { |
2548 | ret = -EINVAL; |
2549 | goto free; |
2550 | } |
2551 | |
2552 | s = strrchr(str, ')'); |
2553 | if (s) { |
2554 | /* unary minus not supported in sub-expressions */ |
2555 | if (*(s+1) != '\0') { |
2556 | hist_err(tr: file->tr, err_type: HIST_ERR_UNARY_MINUS_SUBEXPR, |
2557 | err_pos: errpos(str)); |
2558 | ret = -EINVAL; |
2559 | goto free; |
2560 | } |
2561 | *s = '\0'; |
2562 | } |
2563 | else { |
2564 | ret = -EINVAL; /* no closing ')' */ |
2565 | goto free; |
2566 | } |
2567 | |
2568 | flags |= HIST_FIELD_FL_EXPR; |
2569 | expr = create_hist_field(hist_data, NULL, flags, var_name); |
2570 | if (!expr) { |
2571 | ret = -ENOMEM; |
2572 | goto free; |
2573 | } |
2574 | |
2575 | operand_flags = 0; |
2576 | operand1 = parse_expr(hist_data, file, str, flags: operand_flags, NULL, n_subexprs); |
2577 | if (IS_ERR(ptr: operand1)) { |
2578 | ret = PTR_ERR(ptr: operand1); |
2579 | goto free; |
2580 | } |
2581 | if (operand1->flags & HIST_FIELD_FL_STRING) { |
2582 | /* String type can not be the operand of unary operator. */ |
2583 | hist_err(tr: file->tr, err_type: HIST_ERR_INVALID_STR_OPERAND, err_pos: errpos(str)); |
2584 | destroy_hist_field(hist_field: operand1, level: 0); |
2585 | ret = -EINVAL; |
2586 | goto free; |
2587 | } |
2588 | |
2589 | expr->flags |= operand1->flags & |
2590 | (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); |
2591 | expr->fn_num = HIST_FIELD_FN_UMINUS; |
2592 | expr->operands[0] = operand1; |
2593 | expr->size = operand1->size; |
2594 | expr->is_signed = operand1->is_signed; |
2595 | expr->operator = FIELD_OP_UNARY_MINUS; |
2596 | expr->name = expr_str(field: expr, level: 0); |
2597 | expr->type = kstrdup_const(s: operand1->type, GFP_KERNEL); |
2598 | if (!expr->type) { |
2599 | ret = -ENOMEM; |
2600 | goto free; |
2601 | } |
2602 | |
2603 | return expr; |
2604 | free: |
2605 | destroy_hist_field(hist_field: expr, level: 0); |
2606 | return ERR_PTR(error: ret); |
2607 | } |
2608 | |
2609 | /* |
2610 | * If the operands are var refs, return pointers the |
2611 | * variable(s) referenced in var1 and var2, else NULL. |
2612 | */ |
2613 | static int check_expr_operands(struct trace_array *tr, |
2614 | struct hist_field *operand1, |
2615 | struct hist_field *operand2, |
2616 | struct hist_field **var1, |
2617 | struct hist_field **var2) |
2618 | { |
2619 | unsigned long operand1_flags = operand1->flags; |
2620 | unsigned long operand2_flags = operand2->flags; |
2621 | |
2622 | if ((operand1_flags & HIST_FIELD_FL_VAR_REF) || |
2623 | (operand1_flags & HIST_FIELD_FL_ALIAS)) { |
2624 | struct hist_field *var; |
2625 | |
2626 | var = find_var_field(hist_data: operand1->var.hist_data, var_name: operand1->name); |
2627 | if (!var) |
2628 | return -EINVAL; |
2629 | operand1_flags = var->flags; |
2630 | *var1 = var; |
2631 | } |
2632 | |
2633 | if ((operand2_flags & HIST_FIELD_FL_VAR_REF) || |
2634 | (operand2_flags & HIST_FIELD_FL_ALIAS)) { |
2635 | struct hist_field *var; |
2636 | |
2637 | var = find_var_field(hist_data: operand2->var.hist_data, var_name: operand2->name); |
2638 | if (!var) |
2639 | return -EINVAL; |
2640 | operand2_flags = var->flags; |
2641 | *var2 = var; |
2642 | } |
2643 | |
2644 | if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) != |
2645 | (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) { |
2646 | hist_err(tr, err_type: HIST_ERR_TIMESTAMP_MISMATCH, err_pos: 0); |
2647 | return -EINVAL; |
2648 | } |
2649 | |
2650 | return 0; |
2651 | } |
2652 | |
2653 | static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, |
2654 | struct trace_event_file *file, |
2655 | char *str, unsigned long flags, |
2656 | char *var_name, unsigned int *n_subexprs) |
2657 | { |
2658 | struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL; |
2659 | struct hist_field *var1 = NULL, *var2 = NULL; |
2660 | unsigned long operand_flags, operand2_flags; |
2661 | int field_op, ret = -EINVAL; |
2662 | char *sep, *operand1_str; |
2663 | enum hist_field_fn op_fn; |
2664 | bool combine_consts; |
2665 | |
2666 | if (*n_subexprs > 3) { |
2667 | hist_err(tr: file->tr, err_type: HIST_ERR_TOO_MANY_SUBEXPR, err_pos: errpos(str)); |
2668 | return ERR_PTR(error: -EINVAL); |
2669 | } |
2670 | |
2671 | field_op = contains_operator(str, sep: &sep); |
2672 | |
2673 | if (field_op == FIELD_OP_NONE) |
2674 | return parse_atom(hist_data, file, str, flags: &flags, var_name); |
2675 | |
2676 | if (field_op == FIELD_OP_UNARY_MINUS) |
2677 | return parse_unary(hist_data, file, str, flags, var_name, n_subexprs); |
2678 | |
2679 | /* Binary operator found, increment n_subexprs */ |
2680 | ++*n_subexprs; |
2681 | |
2682 | /* Split the expression string at the root operator */ |
2683 | if (!sep) |
2684 | return ERR_PTR(error: -EINVAL); |
2685 | |
2686 | *sep = '\0'; |
2687 | operand1_str = str; |
2688 | str = sep+1; |
2689 | |
2690 | /* Binary operator requires both operands */ |
2691 | if (*operand1_str == '\0' || *str == '\0') |
2692 | return ERR_PTR(error: -EINVAL); |
2693 | |
2694 | operand_flags = 0; |
2695 | |
2696 | /* LHS of string is an expression e.g. a+b in a+b+c */ |
2697 | operand1 = parse_expr(hist_data, file, str: operand1_str, flags: operand_flags, NULL, n_subexprs); |
2698 | if (IS_ERR(ptr: operand1)) |
2699 | return ERR_CAST(ptr: operand1); |
2700 | |
2701 | if (operand1->flags & HIST_FIELD_FL_STRING) { |
2702 | hist_err(tr: file->tr, err_type: HIST_ERR_INVALID_STR_OPERAND, err_pos: errpos(str: operand1_str)); |
2703 | ret = -EINVAL; |
2704 | goto free_op1; |
2705 | } |
2706 | |
2707 | /* RHS of string is another expression e.g. c in a+b+c */ |
2708 | operand_flags = 0; |
2709 | operand2 = parse_expr(hist_data, file, str, flags: operand_flags, NULL, n_subexprs); |
2710 | if (IS_ERR(ptr: operand2)) { |
2711 | ret = PTR_ERR(ptr: operand2); |
2712 | goto free_op1; |
2713 | } |
2714 | if (operand2->flags & HIST_FIELD_FL_STRING) { |
2715 | hist_err(tr: file->tr, err_type: HIST_ERR_INVALID_STR_OPERAND, err_pos: errpos(str)); |
2716 | ret = -EINVAL; |
2717 | goto free_operands; |
2718 | } |
2719 | |
2720 | switch (field_op) { |
2721 | case FIELD_OP_MINUS: |
2722 | op_fn = HIST_FIELD_FN_MINUS; |
2723 | break; |
2724 | case FIELD_OP_PLUS: |
2725 | op_fn = HIST_FIELD_FN_PLUS; |
2726 | break; |
2727 | case FIELD_OP_DIV: |
2728 | op_fn = HIST_FIELD_FN_DIV; |
2729 | break; |
2730 | case FIELD_OP_MULT: |
2731 | op_fn = HIST_FIELD_FN_MULT; |
2732 | break; |
2733 | default: |
2734 | ret = -EINVAL; |
2735 | goto free_operands; |
2736 | } |
2737 | |
2738 | ret = check_expr_operands(tr: file->tr, operand1, operand2, var1: &var1, var2: &var2); |
2739 | if (ret) |
2740 | goto free_operands; |
2741 | |
2742 | operand_flags = var1 ? var1->flags : operand1->flags; |
2743 | operand2_flags = var2 ? var2->flags : operand2->flags; |
2744 | |
2745 | /* |
2746 | * If both operands are constant, the expression can be |
2747 | * collapsed to a single constant. |
2748 | */ |
2749 | combine_consts = operand_flags & operand2_flags & HIST_FIELD_FL_CONST; |
2750 | |
2751 | flags |= combine_consts ? HIST_FIELD_FL_CONST : HIST_FIELD_FL_EXPR; |
2752 | |
2753 | flags |= operand1->flags & |
2754 | (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); |
2755 | |
2756 | expr = create_hist_field(hist_data, NULL, flags, var_name); |
2757 | if (!expr) { |
2758 | ret = -ENOMEM; |
2759 | goto free_operands; |
2760 | } |
2761 | |
2762 | operand1->read_once = true; |
2763 | operand2->read_once = true; |
2764 | |
2765 | /* The operands are now owned and free'd by 'expr' */ |
2766 | expr->operands[0] = operand1; |
2767 | expr->operands[1] = operand2; |
2768 | |
2769 | if (field_op == FIELD_OP_DIV && |
2770 | operand2_flags & HIST_FIELD_FL_CONST) { |
2771 | u64 divisor = var2 ? var2->constant : operand2->constant; |
2772 | |
2773 | if (!divisor) { |
2774 | hist_err(tr: file->tr, err_type: HIST_ERR_DIVISION_BY_ZERO, err_pos: errpos(str)); |
2775 | ret = -EDOM; |
2776 | goto free_expr; |
2777 | } |
2778 | |
2779 | /* |
2780 | * Copy the divisor here so we don't have to look it up |
2781 | * later if this is a var ref |
2782 | */ |
2783 | operand2->constant = divisor; |
2784 | op_fn = hist_field_get_div_fn(divisor: operand2); |
2785 | } |
2786 | |
2787 | expr->fn_num = op_fn; |
2788 | |
2789 | if (combine_consts) { |
2790 | if (var1) |
2791 | expr->operands[0] = var1; |
2792 | if (var2) |
2793 | expr->operands[1] = var2; |
2794 | |
2795 | expr->constant = hist_fn_call(hist_field: expr, NULL, NULL, NULL, NULL); |
2796 | expr->fn_num = HIST_FIELD_FN_CONST; |
2797 | |
2798 | expr->operands[0] = NULL; |
2799 | expr->operands[1] = NULL; |
2800 | |
2801 | /* |
2802 | * var refs won't be destroyed immediately |
2803 | * See: destroy_hist_field() |
2804 | */ |
2805 | destroy_hist_field(hist_field: operand2, level: 0); |
2806 | destroy_hist_field(hist_field: operand1, level: 0); |
2807 | |
2808 | expr->name = expr_str(field: expr, level: 0); |
2809 | } else { |
2810 | /* The operand sizes should be the same, so just pick one */ |
2811 | expr->size = operand1->size; |
2812 | expr->is_signed = operand1->is_signed; |
2813 | |
2814 | expr->operator = field_op; |
2815 | expr->type = kstrdup_const(s: operand1->type, GFP_KERNEL); |
2816 | if (!expr->type) { |
2817 | ret = -ENOMEM; |
2818 | goto free_expr; |
2819 | } |
2820 | |
2821 | expr->name = expr_str(field: expr, level: 0); |
2822 | } |
2823 | |
2824 | return expr; |
2825 | |
2826 | free_operands: |
2827 | destroy_hist_field(hist_field: operand2, level: 0); |
2828 | free_op1: |
2829 | destroy_hist_field(hist_field: operand1, level: 0); |
2830 | return ERR_PTR(error: ret); |
2831 | |
2832 | free_expr: |
2833 | destroy_hist_field(hist_field: expr, level: 0); |
2834 | return ERR_PTR(error: ret); |
2835 | } |
2836 | |
2837 | static char *find_trigger_filter(struct hist_trigger_data *hist_data, |
2838 | struct trace_event_file *file) |
2839 | { |
2840 | struct event_trigger_data *test; |
2841 | |
2842 | lockdep_assert_held(&event_mutex); |
2843 | |
2844 | list_for_each_entry(test, &file->triggers, list) { |
2845 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
2846 | if (test->private_data == hist_data) |
2847 | return test->filter_str; |
2848 | } |
2849 | } |
2850 | |
2851 | return NULL; |
2852 | } |
2853 | |
2854 | static struct event_command trigger_hist_cmd; |
2855 | static int event_hist_trigger_parse(struct event_command *cmd_ops, |
2856 | struct trace_event_file *file, |
2857 | char *glob, char *cmd, |
2858 | char *param_and_filter); |
2859 | |
2860 | static bool compatible_keys(struct hist_trigger_data *target_hist_data, |
2861 | struct hist_trigger_data *hist_data, |
2862 | unsigned int n_keys) |
2863 | { |
2864 | struct hist_field *target_hist_field, *hist_field; |
2865 | unsigned int n, i, j; |
2866 | |
2867 | if (hist_data->n_fields - hist_data->n_vals != n_keys) |
2868 | return false; |
2869 | |
2870 | i = hist_data->n_vals; |
2871 | j = target_hist_data->n_vals; |
2872 | |
2873 | for (n = 0; n < n_keys; n++) { |
2874 | hist_field = hist_data->fields[i + n]; |
2875 | target_hist_field = target_hist_data->fields[j + n]; |
2876 | |
2877 | if (strcmp(hist_field->type, target_hist_field->type) != 0) |
2878 | return false; |
2879 | if (hist_field->size != target_hist_field->size) |
2880 | return false; |
2881 | if (hist_field->is_signed != target_hist_field->is_signed) |
2882 | return false; |
2883 | } |
2884 | |
2885 | return true; |
2886 | } |
2887 | |
2888 | static struct hist_trigger_data * |
2889 | find_compatible_hist(struct hist_trigger_data *target_hist_data, |
2890 | struct trace_event_file *file) |
2891 | { |
2892 | struct hist_trigger_data *hist_data; |
2893 | struct event_trigger_data *test; |
2894 | unsigned int n_keys; |
2895 | |
2896 | lockdep_assert_held(&event_mutex); |
2897 | |
2898 | n_keys = target_hist_data->n_fields - target_hist_data->n_vals; |
2899 | |
2900 | list_for_each_entry(test, &file->triggers, list) { |
2901 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
2902 | hist_data = test->private_data; |
2903 | |
2904 | if (compatible_keys(target_hist_data, hist_data, n_keys)) |
2905 | return hist_data; |
2906 | } |
2907 | } |
2908 | |
2909 | return NULL; |
2910 | } |
2911 | |
2912 | static struct trace_event_file *event_file(struct trace_array *tr, |
2913 | char *system, char *event_name) |
2914 | { |
2915 | struct trace_event_file *file; |
2916 | |
2917 | file = __find_event_file(tr, system, event: event_name); |
2918 | if (!file) |
2919 | return ERR_PTR(error: -EINVAL); |
2920 | |
2921 | return file; |
2922 | } |
2923 | |
2924 | static struct hist_field * |
2925 | find_synthetic_field_var(struct hist_trigger_data *target_hist_data, |
2926 | char *system, char *event_name, char *field_name) |
2927 | { |
2928 | struct hist_field *event_var; |
2929 | char *synthetic_name; |
2930 | |
2931 | synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); |
2932 | if (!synthetic_name) |
2933 | return ERR_PTR(error: -ENOMEM); |
2934 | |
2935 | strcpy(p: synthetic_name, q: "synthetic_" ); |
2936 | strcat(p: synthetic_name, q: field_name); |
2937 | |
2938 | event_var = find_event_var(hist_data: target_hist_data, system, event_name, var_name: synthetic_name); |
2939 | |
2940 | kfree(objp: synthetic_name); |
2941 | |
2942 | return event_var; |
2943 | } |
2944 | |
2945 | /** |
2946 | * create_field_var_hist - Automatically create a histogram and var for a field |
2947 | * @target_hist_data: The target hist trigger |
2948 | * @subsys_name: Optional subsystem name |
2949 | * @event_name: Optional event name |
2950 | * @field_name: The name of the field (and the resulting variable) |
2951 | * |
2952 | * Hist trigger actions fetch data from variables, not directly from |
2953 | * events. However, for convenience, users are allowed to directly |
2954 | * specify an event field in an action, which will be automatically |
2955 | * converted into a variable on their behalf. |
2956 | * |
2957 | * If a user specifies a field on an event that isn't the event the |
2958 | * histogram currently being defined (the target event histogram), the |
2959 | * only way that can be accomplished is if a new hist trigger is |
2960 | * created and the field variable defined on that. |
2961 | * |
2962 | * This function creates a new histogram compatible with the target |
2963 | * event (meaning a histogram with the same key as the target |
2964 | * histogram), and creates a variable for the specified field, but |
2965 | * with 'synthetic_' prepended to the variable name in order to avoid |
2966 | * collision with normal field variables. |
2967 | * |
2968 | * Return: The variable created for the field. |
2969 | */ |
2970 | static struct hist_field * |
2971 | create_field_var_hist(struct hist_trigger_data *target_hist_data, |
2972 | char *subsys_name, char *event_name, char *field_name) |
2973 | { |
2974 | struct trace_array *tr = target_hist_data->event_file->tr; |
2975 | struct hist_trigger_data *hist_data; |
2976 | unsigned int i, n, first = true; |
2977 | struct field_var_hist *var_hist; |
2978 | struct trace_event_file *file; |
2979 | struct hist_field *key_field; |
2980 | struct hist_field *event_var; |
2981 | char *saved_filter; |
2982 | char *cmd; |
2983 | int ret; |
2984 | |
2985 | if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) { |
2986 | hist_err(tr, err_type: HIST_ERR_TOO_MANY_FIELD_VARS, err_pos: errpos(str: field_name)); |
2987 | return ERR_PTR(error: -EINVAL); |
2988 | } |
2989 | |
2990 | file = event_file(tr, system: subsys_name, event_name); |
2991 | |
2992 | if (IS_ERR(ptr: file)) { |
2993 | hist_err(tr, err_type: HIST_ERR_EVENT_FILE_NOT_FOUND, err_pos: errpos(str: field_name)); |
2994 | ret = PTR_ERR(ptr: file); |
2995 | return ERR_PTR(error: ret); |
2996 | } |
2997 | |
2998 | /* |
2999 | * Look for a histogram compatible with target. We'll use the |
3000 | * found histogram specification to create a new matching |
3001 | * histogram with our variable on it. target_hist_data is not |
3002 | * yet a registered histogram so we can't use that. |
3003 | */ |
3004 | hist_data = find_compatible_hist(target_hist_data, file); |
3005 | if (!hist_data) { |
3006 | hist_err(tr, err_type: HIST_ERR_HIST_NOT_FOUND, err_pos: errpos(str: field_name)); |
3007 | return ERR_PTR(error: -EINVAL); |
3008 | } |
3009 | |
3010 | /* See if a synthetic field variable has already been created */ |
3011 | event_var = find_synthetic_field_var(target_hist_data, system: subsys_name, |
3012 | event_name, field_name); |
3013 | if (!IS_ERR_OR_NULL(ptr: event_var)) |
3014 | return event_var; |
3015 | |
3016 | var_hist = kzalloc(size: sizeof(*var_hist), GFP_KERNEL); |
3017 | if (!var_hist) |
3018 | return ERR_PTR(error: -ENOMEM); |
3019 | |
3020 | cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); |
3021 | if (!cmd) { |
3022 | kfree(objp: var_hist); |
3023 | return ERR_PTR(error: -ENOMEM); |
3024 | } |
3025 | |
3026 | /* Use the same keys as the compatible histogram */ |
3027 | strcat(p: cmd, q: "keys=" ); |
3028 | |
3029 | for_each_hist_key_field(i, hist_data) { |
3030 | key_field = hist_data->fields[i]; |
3031 | if (!first) |
3032 | strcat(p: cmd, q: "," ); |
3033 | strcat(p: cmd, q: key_field->field->name); |
3034 | first = false; |
3035 | } |
3036 | |
3037 | /* Create the synthetic field variable specification */ |
3038 | strcat(p: cmd, q: ":synthetic_" ); |
3039 | strcat(p: cmd, q: field_name); |
3040 | strcat(p: cmd, q: "=" ); |
3041 | strcat(p: cmd, q: field_name); |
3042 | |
3043 | /* Use the same filter as the compatible histogram */ |
3044 | saved_filter = find_trigger_filter(hist_data, file); |
3045 | if (saved_filter) { |
3046 | strcat(p: cmd, q: " if " ); |
3047 | strcat(p: cmd, q: saved_filter); |
3048 | } |
3049 | |
3050 | var_hist->cmd = kstrdup(s: cmd, GFP_KERNEL); |
3051 | if (!var_hist->cmd) { |
3052 | kfree(objp: cmd); |
3053 | kfree(objp: var_hist); |
3054 | return ERR_PTR(error: -ENOMEM); |
3055 | } |
3056 | |
3057 | /* Save the compatible histogram information */ |
3058 | var_hist->hist_data = hist_data; |
3059 | |
3060 | /* Create the new histogram with our variable */ |
3061 | ret = event_hist_trigger_parse(cmd_ops: &trigger_hist_cmd, file, |
3062 | glob: "" , cmd: "hist" , param_and_filter: cmd); |
3063 | if (ret) { |
3064 | kfree(objp: cmd); |
3065 | kfree(objp: var_hist->cmd); |
3066 | kfree(objp: var_hist); |
3067 | hist_err(tr, err_type: HIST_ERR_HIST_CREATE_FAIL, err_pos: errpos(str: field_name)); |
3068 | return ERR_PTR(error: ret); |
3069 | } |
3070 | |
3071 | kfree(objp: cmd); |
3072 | |
3073 | /* If we can't find the variable, something went wrong */ |
3074 | event_var = find_synthetic_field_var(target_hist_data, system: subsys_name, |
3075 | event_name, field_name); |
3076 | if (IS_ERR_OR_NULL(ptr: event_var)) { |
3077 | kfree(objp: var_hist->cmd); |
3078 | kfree(objp: var_hist); |
3079 | hist_err(tr, err_type: HIST_ERR_SYNTH_VAR_NOT_FOUND, err_pos: errpos(str: field_name)); |
3080 | return ERR_PTR(error: -EINVAL); |
3081 | } |
3082 | |
3083 | n = target_hist_data->n_field_var_hists; |
3084 | target_hist_data->field_var_hists[n] = var_hist; |
3085 | target_hist_data->n_field_var_hists++; |
3086 | |
3087 | return event_var; |
3088 | } |
3089 | |
3090 | static struct hist_field * |
3091 | find_target_event_var(struct hist_trigger_data *hist_data, |
3092 | char *subsys_name, char *event_name, char *var_name) |
3093 | { |
3094 | struct trace_event_file *file = hist_data->event_file; |
3095 | struct hist_field *hist_field = NULL; |
3096 | |
3097 | if (subsys_name) { |
3098 | struct trace_event_call *call; |
3099 | |
3100 | if (!event_name) |
3101 | return NULL; |
3102 | |
3103 | call = file->event_call; |
3104 | |
3105 | if (strcmp(subsys_name, call->class->system) != 0) |
3106 | return NULL; |
3107 | |
3108 | if (strcmp(event_name, trace_event_name(call)) != 0) |
3109 | return NULL; |
3110 | } |
3111 | |
3112 | hist_field = find_var_field(hist_data, var_name); |
3113 | |
3114 | return hist_field; |
3115 | } |
3116 | |
3117 | static inline void __update_field_vars(struct tracing_map_elt *elt, |
3118 | struct trace_buffer *buffer, |
3119 | struct ring_buffer_event *rbe, |
3120 | void *rec, |
3121 | struct field_var **field_vars, |
3122 | unsigned int n_field_vars, |
3123 | unsigned int field_var_str_start) |
3124 | { |
3125 | struct hist_elt_data *elt_data = elt->private_data; |
3126 | unsigned int i, j, var_idx; |
3127 | u64 var_val; |
3128 | |
3129 | /* Make sure stacktrace can fit in the string variable length */ |
3130 | BUILD_BUG_ON((HIST_STACKTRACE_DEPTH + 1) * sizeof(long) >= STR_VAR_LEN_MAX); |
3131 | |
3132 | for (i = 0, j = field_var_str_start; i < n_field_vars; i++) { |
3133 | struct field_var *field_var = field_vars[i]; |
3134 | struct hist_field *var = field_var->var; |
3135 | struct hist_field *val = field_var->val; |
3136 | |
3137 | var_val = hist_fn_call(hist_field: val, elt, buffer, rbe, event: rec); |
3138 | var_idx = var->var.idx; |
3139 | |
3140 | if (val->flags & (HIST_FIELD_FL_STRING | |
3141 | HIST_FIELD_FL_STACKTRACE)) { |
3142 | char *str = elt_data->field_var_str[j++]; |
3143 | char *val_str = (char *)(uintptr_t)var_val; |
3144 | unsigned int size; |
3145 | |
3146 | if (val->flags & HIST_FIELD_FL_STRING) { |
3147 | size = min(val->size, STR_VAR_LEN_MAX); |
3148 | strscpy(p: str, q: val_str, size); |
3149 | } else { |
3150 | char *stack_start = str + sizeof(unsigned long); |
3151 | int e; |
3152 | |
3153 | e = stack_trace_save(store: (void *)stack_start, |
3154 | HIST_STACKTRACE_DEPTH, |
3155 | HIST_STACKTRACE_SKIP); |
3156 | if (e < HIST_STACKTRACE_DEPTH - 1) |
3157 | ((unsigned long *)stack_start)[e] = 0; |
3158 | *((unsigned long *)str) = e; |
3159 | } |
3160 | var_val = (u64)(uintptr_t)str; |
3161 | } |
3162 | tracing_map_set_var(elt, i: var_idx, n: var_val); |
3163 | } |
3164 | } |
3165 | |
3166 | static void update_field_vars(struct hist_trigger_data *hist_data, |
3167 | struct tracing_map_elt *elt, |
3168 | struct trace_buffer *buffer, |
3169 | struct ring_buffer_event *rbe, |
3170 | void *rec) |
3171 | { |
3172 | __update_field_vars(elt, buffer, rbe, rec, field_vars: hist_data->field_vars, |
3173 | n_field_vars: hist_data->n_field_vars, field_var_str_start: 0); |
3174 | } |
3175 | |
3176 | static void save_track_data_vars(struct hist_trigger_data *hist_data, |
3177 | struct tracing_map_elt *elt, |
3178 | struct trace_buffer *buffer, void *rec, |
3179 | struct ring_buffer_event *rbe, void *key, |
3180 | struct action_data *data, u64 *var_ref_vals) |
3181 | { |
3182 | __update_field_vars(elt, buffer, rbe, rec, field_vars: hist_data->save_vars, |
3183 | n_field_vars: hist_data->n_save_vars, field_var_str_start: hist_data->n_field_var_str); |
3184 | } |
3185 | |
3186 | static struct hist_field *create_var(struct hist_trigger_data *hist_data, |
3187 | struct trace_event_file *file, |
3188 | char *name, int size, const char *type) |
3189 | { |
3190 | struct hist_field *var; |
3191 | int idx; |
3192 | |
3193 | if (find_var(hist_data, file, var_name: name) && !hist_data->remove) { |
3194 | var = ERR_PTR(error: -EINVAL); |
3195 | goto out; |
3196 | } |
3197 | |
3198 | var = kzalloc(size: sizeof(struct hist_field), GFP_KERNEL); |
3199 | if (!var) { |
3200 | var = ERR_PTR(error: -ENOMEM); |
3201 | goto out; |
3202 | } |
3203 | |
3204 | idx = tracing_map_add_var(map: hist_data->map); |
3205 | if (idx < 0) { |
3206 | kfree(objp: var); |
3207 | var = ERR_PTR(error: -EINVAL); |
3208 | goto out; |
3209 | } |
3210 | |
3211 | var->ref = 1; |
3212 | var->flags = HIST_FIELD_FL_VAR; |
3213 | var->var.idx = idx; |
3214 | var->var.hist_data = var->hist_data = hist_data; |
3215 | var->size = size; |
3216 | var->var.name = kstrdup(s: name, GFP_KERNEL); |
3217 | var->type = kstrdup_const(s: type, GFP_KERNEL); |
3218 | if (!var->var.name || !var->type) { |
3219 | kfree_const(x: var->type); |
3220 | kfree(objp: var->var.name); |
3221 | kfree(objp: var); |
3222 | var = ERR_PTR(error: -ENOMEM); |
3223 | } |
3224 | out: |
3225 | return var; |
3226 | } |
3227 | |
3228 | static struct field_var *create_field_var(struct hist_trigger_data *hist_data, |
3229 | struct trace_event_file *file, |
3230 | char *field_name) |
3231 | { |
3232 | struct hist_field *val = NULL, *var = NULL; |
3233 | unsigned long flags = HIST_FIELD_FL_VAR; |
3234 | struct trace_array *tr = file->tr; |
3235 | struct field_var *field_var; |
3236 | int ret = 0; |
3237 | |
3238 | if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) { |
3239 | hist_err(tr, err_type: HIST_ERR_TOO_MANY_FIELD_VARS, err_pos: errpos(str: field_name)); |
3240 | ret = -EINVAL; |
3241 | goto err; |
3242 | } |
3243 | |
3244 | val = parse_atom(hist_data, file, str: field_name, flags: &flags, NULL); |
3245 | if (IS_ERR(ptr: val)) { |
3246 | hist_err(tr, err_type: HIST_ERR_FIELD_VAR_PARSE_FAIL, err_pos: errpos(str: field_name)); |
3247 | ret = PTR_ERR(ptr: val); |
3248 | goto err; |
3249 | } |
3250 | |
3251 | var = create_var(hist_data, file, name: field_name, size: val->size, type: val->type); |
3252 | if (IS_ERR(ptr: var)) { |
3253 | hist_err(tr, err_type: HIST_ERR_VAR_CREATE_FIND_FAIL, err_pos: errpos(str: field_name)); |
3254 | kfree(objp: val); |
3255 | ret = PTR_ERR(ptr: var); |
3256 | goto err; |
3257 | } |
3258 | |
3259 | field_var = kzalloc(size: sizeof(struct field_var), GFP_KERNEL); |
3260 | if (!field_var) { |
3261 | kfree(objp: val); |
3262 | kfree(objp: var); |
3263 | ret = -ENOMEM; |
3264 | goto err; |
3265 | } |
3266 | |
3267 | field_var->var = var; |
3268 | field_var->val = val; |
3269 | out: |
3270 | return field_var; |
3271 | err: |
3272 | field_var = ERR_PTR(error: ret); |
3273 | goto out; |
3274 | } |
3275 | |
3276 | /** |
3277 | * create_target_field_var - Automatically create a variable for a field |
3278 | * @target_hist_data: The target hist trigger |
3279 | * @subsys_name: Optional subsystem name |
3280 | * @event_name: Optional event name |
3281 | * @var_name: The name of the field (and the resulting variable) |
3282 | * |
3283 | * Hist trigger actions fetch data from variables, not directly from |
3284 | * events. However, for convenience, users are allowed to directly |
3285 | * specify an event field in an action, which will be automatically |
3286 | * converted into a variable on their behalf. |
3287 | * |
3288 | * This function creates a field variable with the name var_name on |
3289 | * the hist trigger currently being defined on the target event. If |
3290 | * subsys_name and event_name are specified, this function simply |
3291 | * verifies that they do in fact match the target event subsystem and |
3292 | * event name. |
3293 | * |
3294 | * Return: The variable created for the field. |
3295 | */ |
3296 | static struct field_var * |
3297 | create_target_field_var(struct hist_trigger_data *target_hist_data, |
3298 | char *subsys_name, char *event_name, char *var_name) |
3299 | { |
3300 | struct trace_event_file *file = target_hist_data->event_file; |
3301 | |
3302 | if (subsys_name) { |
3303 | struct trace_event_call *call; |
3304 | |
3305 | if (!event_name) |
3306 | return NULL; |
3307 | |
3308 | call = file->event_call; |
3309 | |
3310 | if (strcmp(subsys_name, call->class->system) != 0) |
3311 | return NULL; |
3312 | |
3313 | if (strcmp(event_name, trace_event_name(call)) != 0) |
3314 | return NULL; |
3315 | } |
3316 | |
3317 | return create_field_var(hist_data: target_hist_data, file, field_name: var_name); |
3318 | } |
3319 | |
3320 | static bool check_track_val_max(u64 track_val, u64 var_val) |
3321 | { |
3322 | if (var_val <= track_val) |
3323 | return false; |
3324 | |
3325 | return true; |
3326 | } |
3327 | |
3328 | static bool check_track_val_changed(u64 track_val, u64 var_val) |
3329 | { |
3330 | if (var_val == track_val) |
3331 | return false; |
3332 | |
3333 | return true; |
3334 | } |
3335 | |
3336 | static u64 get_track_val(struct hist_trigger_data *hist_data, |
3337 | struct tracing_map_elt *elt, |
3338 | struct action_data *data) |
3339 | { |
3340 | unsigned int track_var_idx = data->track_data.track_var->var.idx; |
3341 | u64 track_val; |
3342 | |
3343 | track_val = tracing_map_read_var(elt, i: track_var_idx); |
3344 | |
3345 | return track_val; |
3346 | } |
3347 | |
3348 | static void save_track_val(struct hist_trigger_data *hist_data, |
3349 | struct tracing_map_elt *elt, |
3350 | struct action_data *data, u64 var_val) |
3351 | { |
3352 | unsigned int track_var_idx = data->track_data.track_var->var.idx; |
3353 | |
3354 | tracing_map_set_var(elt, i: track_var_idx, n: var_val); |
3355 | } |
3356 | |
3357 | static void save_track_data(struct hist_trigger_data *hist_data, |
3358 | struct tracing_map_elt *elt, |
3359 | struct trace_buffer *buffer, void *rec, |
3360 | struct ring_buffer_event *rbe, void *key, |
3361 | struct action_data *data, u64 *var_ref_vals) |
3362 | { |
3363 | if (data->track_data.save_data) |
3364 | data->track_data.save_data(hist_data, elt, buffer, rec, rbe, |
3365 | key, data, var_ref_vals); |
3366 | } |
3367 | |
3368 | static bool check_track_val(struct tracing_map_elt *elt, |
3369 | struct action_data *data, |
3370 | u64 var_val) |
3371 | { |
3372 | struct hist_trigger_data *hist_data; |
3373 | u64 track_val; |
3374 | |
3375 | hist_data = data->track_data.track_var->hist_data; |
3376 | track_val = get_track_val(hist_data, elt, data); |
3377 | |
3378 | return data->track_data.check_val(track_val, var_val); |
3379 | } |
3380 | |
3381 | #ifdef CONFIG_TRACER_SNAPSHOT |
3382 | static bool cond_snapshot_update(struct trace_array *tr, void *cond_data) |
3383 | { |
3384 | /* called with tr->max_lock held */ |
3385 | struct track_data *track_data = tr->cond_snapshot->cond_data; |
3386 | struct hist_elt_data *elt_data, *track_elt_data; |
3387 | struct snapshot_context *context = cond_data; |
3388 | struct action_data *action; |
3389 | u64 track_val; |
3390 | |
3391 | if (!track_data) |
3392 | return false; |
3393 | |
3394 | action = track_data->action_data; |
3395 | |
3396 | track_val = get_track_val(hist_data: track_data->hist_data, elt: context->elt, |
3397 | data: track_data->action_data); |
3398 | |
3399 | if (!action->track_data.check_val(track_data->track_val, track_val)) |
3400 | return false; |
3401 | |
3402 | track_data->track_val = track_val; |
3403 | memcpy(track_data->key, context->key, track_data->key_len); |
3404 | |
3405 | elt_data = context->elt->private_data; |
3406 | track_elt_data = track_data->elt.private_data; |
3407 | if (elt_data->comm) |
3408 | strncpy(p: track_elt_data->comm, q: elt_data->comm, size: TASK_COMM_LEN); |
3409 | |
3410 | track_data->updated = true; |
3411 | |
3412 | return true; |
3413 | } |
3414 | |
3415 | static void save_track_data_snapshot(struct hist_trigger_data *hist_data, |
3416 | struct tracing_map_elt *elt, |
3417 | struct trace_buffer *buffer, void *rec, |
3418 | struct ring_buffer_event *rbe, void *key, |
3419 | struct action_data *data, |
3420 | u64 *var_ref_vals) |
3421 | { |
3422 | struct trace_event_file *file = hist_data->event_file; |
3423 | struct snapshot_context context; |
3424 | |
3425 | context.elt = elt; |
3426 | context.key = key; |
3427 | |
3428 | tracing_snapshot_cond(tr: file->tr, cond_data: &context); |
3429 | } |
3430 | |
3431 | static void hist_trigger_print_key(struct seq_file *m, |
3432 | struct hist_trigger_data *hist_data, |
3433 | void *key, |
3434 | struct tracing_map_elt *elt); |
3435 | |
3436 | static struct action_data *snapshot_action(struct hist_trigger_data *hist_data) |
3437 | { |
3438 | unsigned int i; |
3439 | |
3440 | if (!hist_data->n_actions) |
3441 | return NULL; |
3442 | |
3443 | for (i = 0; i < hist_data->n_actions; i++) { |
3444 | struct action_data *data = hist_data->actions[i]; |
3445 | |
3446 | if (data->action == ACTION_SNAPSHOT) |
3447 | return data; |
3448 | } |
3449 | |
3450 | return NULL; |
3451 | } |
3452 | |
3453 | static void track_data_snapshot_print(struct seq_file *m, |
3454 | struct hist_trigger_data *hist_data) |
3455 | { |
3456 | struct trace_event_file *file = hist_data->event_file; |
3457 | struct track_data *track_data; |
3458 | struct action_data *action; |
3459 | |
3460 | track_data = tracing_cond_snapshot_data(tr: file->tr); |
3461 | if (!track_data) |
3462 | return; |
3463 | |
3464 | if (!track_data->updated) |
3465 | return; |
3466 | |
3467 | action = snapshot_action(hist_data); |
3468 | if (!action) |
3469 | return; |
3470 | |
3471 | seq_puts(m, s: "\nSnapshot taken (see tracing/snapshot). Details:\n" ); |
3472 | seq_printf(m, fmt: "\ttriggering value { %s(%s) }: %10llu" , |
3473 | action->handler == HANDLER_ONMAX ? "onmax" : "onchange" , |
3474 | action->track_data.var_str, track_data->track_val); |
3475 | |
3476 | seq_puts(m, s: "\ttriggered by event with key: " ); |
3477 | hist_trigger_print_key(m, hist_data, key: track_data->key, elt: &track_data->elt); |
3478 | seq_putc(m, c: '\n'); |
3479 | } |
3480 | #else |
3481 | static bool cond_snapshot_update(struct trace_array *tr, void *cond_data) |
3482 | { |
3483 | return false; |
3484 | } |
3485 | static void save_track_data_snapshot(struct hist_trigger_data *hist_data, |
3486 | struct tracing_map_elt *elt, |
3487 | struct trace_buffer *buffer, void *rec, |
3488 | struct ring_buffer_event *rbe, void *key, |
3489 | struct action_data *data, |
3490 | u64 *var_ref_vals) {} |
3491 | static void track_data_snapshot_print(struct seq_file *m, |
3492 | struct hist_trigger_data *hist_data) {} |
3493 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
3494 | |
3495 | static void track_data_print(struct seq_file *m, |
3496 | struct hist_trigger_data *hist_data, |
3497 | struct tracing_map_elt *elt, |
3498 | struct action_data *data) |
3499 | { |
3500 | u64 track_val = get_track_val(hist_data, elt, data); |
3501 | unsigned int i, save_var_idx; |
3502 | |
3503 | if (data->handler == HANDLER_ONMAX) |
3504 | seq_printf(m, fmt: "\n\tmax: %10llu" , track_val); |
3505 | else if (data->handler == HANDLER_ONCHANGE) |
3506 | seq_printf(m, fmt: "\n\tchanged: %10llu" , track_val); |
3507 | |
3508 | if (data->action == ACTION_SNAPSHOT) |
3509 | return; |
3510 | |
3511 | for (i = 0; i < hist_data->n_save_vars; i++) { |
3512 | struct hist_field *save_val = hist_data->save_vars[i]->val; |
3513 | struct hist_field *save_var = hist_data->save_vars[i]->var; |
3514 | u64 val; |
3515 | |
3516 | save_var_idx = save_var->var.idx; |
3517 | |
3518 | val = tracing_map_read_var(elt, i: save_var_idx); |
3519 | |
3520 | if (save_val->flags & HIST_FIELD_FL_STRING) { |
3521 | seq_printf(m, fmt: " %s: %-32s" , save_var->var.name, |
3522 | (char *)(uintptr_t)(val)); |
3523 | } else |
3524 | seq_printf(m, fmt: " %s: %10llu" , save_var->var.name, val); |
3525 | } |
3526 | } |
3527 | |
3528 | static void ontrack_action(struct hist_trigger_data *hist_data, |
3529 | struct tracing_map_elt *elt, |
3530 | struct trace_buffer *buffer, void *rec, |
3531 | struct ring_buffer_event *rbe, void *key, |
3532 | struct action_data *data, u64 *var_ref_vals) |
3533 | { |
3534 | u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx]; |
3535 | |
3536 | if (check_track_val(elt, data, var_val)) { |
3537 | save_track_val(hist_data, elt, data, var_val); |
3538 | save_track_data(hist_data, elt, buffer, rec, rbe, |
3539 | key, data, var_ref_vals); |
3540 | } |
3541 | } |
3542 | |
3543 | static void action_data_destroy(struct action_data *data) |
3544 | { |
3545 | unsigned int i; |
3546 | |
3547 | lockdep_assert_held(&event_mutex); |
3548 | |
3549 | kfree(objp: data->action_name); |
3550 | |
3551 | for (i = 0; i < data->n_params; i++) |
3552 | kfree(objp: data->params[i]); |
3553 | |
3554 | if (data->synth_event) |
3555 | data->synth_event->ref--; |
3556 | |
3557 | kfree(objp: data->synth_event_name); |
3558 | |
3559 | kfree(objp: data); |
3560 | } |
3561 | |
3562 | static void track_data_destroy(struct hist_trigger_data *hist_data, |
3563 | struct action_data *data) |
3564 | { |
3565 | struct trace_event_file *file = hist_data->event_file; |
3566 | |
3567 | destroy_hist_field(hist_field: data->track_data.track_var, level: 0); |
3568 | |
3569 | if (data->action == ACTION_SNAPSHOT) { |
3570 | struct track_data *track_data; |
3571 | |
3572 | track_data = tracing_cond_snapshot_data(tr: file->tr); |
3573 | if (track_data && track_data->hist_data == hist_data) { |
3574 | tracing_snapshot_cond_disable(tr: file->tr); |
3575 | track_data_free(track_data); |
3576 | } |
3577 | } |
3578 | |
3579 | kfree(objp: data->track_data.var_str); |
3580 | |
3581 | action_data_destroy(data); |
3582 | } |
3583 | |
3584 | static int action_create(struct hist_trigger_data *hist_data, |
3585 | struct action_data *data); |
3586 | |
3587 | static int track_data_create(struct hist_trigger_data *hist_data, |
3588 | struct action_data *data) |
3589 | { |
3590 | struct hist_field *var_field, *ref_field, *track_var = NULL; |
3591 | struct trace_event_file *file = hist_data->event_file; |
3592 | struct trace_array *tr = file->tr; |
3593 | char *track_data_var_str; |
3594 | int ret = 0; |
3595 | |
3596 | track_data_var_str = data->track_data.var_str; |
3597 | if (track_data_var_str[0] != '$') { |
3598 | hist_err(tr, err_type: HIST_ERR_ONX_NOT_VAR, err_pos: errpos(str: track_data_var_str)); |
3599 | return -EINVAL; |
3600 | } |
3601 | track_data_var_str++; |
3602 | |
3603 | var_field = find_target_event_var(hist_data, NULL, NULL, var_name: track_data_var_str); |
3604 | if (!var_field) { |
3605 | hist_err(tr, err_type: HIST_ERR_ONX_VAR_NOT_FOUND, err_pos: errpos(str: track_data_var_str)); |
3606 | return -EINVAL; |
3607 | } |
3608 | |
3609 | ref_field = create_var_ref(hist_data, var_field, NULL, NULL); |
3610 | if (!ref_field) |
3611 | return -ENOMEM; |
3612 | |
3613 | data->track_data.var_ref = ref_field; |
3614 | |
3615 | if (data->handler == HANDLER_ONMAX) |
3616 | track_var = create_var(hist_data, file, name: "__max" , size: sizeof(u64), type: "u64" ); |
3617 | if (IS_ERR(ptr: track_var)) { |
3618 | hist_err(tr, err_type: HIST_ERR_ONX_VAR_CREATE_FAIL, err_pos: 0); |
3619 | ret = PTR_ERR(ptr: track_var); |
3620 | goto out; |
3621 | } |
3622 | |
3623 | if (data->handler == HANDLER_ONCHANGE) |
3624 | track_var = create_var(hist_data, file, name: "__change" , size: sizeof(u64), type: "u64" ); |
3625 | if (IS_ERR(ptr: track_var)) { |
3626 | hist_err(tr, err_type: HIST_ERR_ONX_VAR_CREATE_FAIL, err_pos: 0); |
3627 | ret = PTR_ERR(ptr: track_var); |
3628 | goto out; |
3629 | } |
3630 | data->track_data.track_var = track_var; |
3631 | |
3632 | ret = action_create(hist_data, data); |
3633 | out: |
3634 | return ret; |
3635 | } |
3636 | |
3637 | static int parse_action_params(struct trace_array *tr, char *params, |
3638 | struct action_data *data) |
3639 | { |
3640 | char *param, *saved_param; |
3641 | bool first_param = true; |
3642 | int ret = 0; |
3643 | |
3644 | while (params) { |
3645 | if (data->n_params >= SYNTH_FIELDS_MAX) { |
3646 | hist_err(tr, err_type: HIST_ERR_TOO_MANY_PARAMS, err_pos: 0); |
3647 | ret = -EINVAL; |
3648 | goto out; |
3649 | } |
3650 | |
3651 | param = strsep(¶ms, "," ); |
3652 | if (!param) { |
3653 | hist_err(tr, err_type: HIST_ERR_PARAM_NOT_FOUND, err_pos: 0); |
3654 | ret = -EINVAL; |
3655 | goto out; |
3656 | } |
3657 | |
3658 | param = strstrip(str: param); |
3659 | if (strlen(param) < 2) { |
3660 | hist_err(tr, err_type: HIST_ERR_INVALID_PARAM, err_pos: errpos(str: param)); |
3661 | ret = -EINVAL; |
3662 | goto out; |
3663 | } |
3664 | |
3665 | saved_param = kstrdup(s: param, GFP_KERNEL); |
3666 | if (!saved_param) { |
3667 | ret = -ENOMEM; |
3668 | goto out; |
3669 | } |
3670 | |
3671 | if (first_param && data->use_trace_keyword) { |
3672 | data->synth_event_name = saved_param; |
3673 | first_param = false; |
3674 | continue; |
3675 | } |
3676 | first_param = false; |
3677 | |
3678 | data->params[data->n_params++] = saved_param; |
3679 | } |
3680 | out: |
3681 | return ret; |
3682 | } |
3683 | |
3684 | static int action_parse(struct trace_array *tr, char *str, struct action_data *data, |
3685 | enum handler_id handler) |
3686 | { |
3687 | char *action_name; |
3688 | int ret = 0; |
3689 | |
3690 | strsep(&str, "." ); |
3691 | if (!str) { |
3692 | hist_err(tr, err_type: HIST_ERR_ACTION_NOT_FOUND, err_pos: 0); |
3693 | ret = -EINVAL; |
3694 | goto out; |
3695 | } |
3696 | |
3697 | action_name = strsep(&str, "(" ); |
3698 | if (!action_name || !str) { |
3699 | hist_err(tr, err_type: HIST_ERR_ACTION_NOT_FOUND, err_pos: 0); |
3700 | ret = -EINVAL; |
3701 | goto out; |
3702 | } |
3703 | |
3704 | if (str_has_prefix(str: action_name, prefix: "save" )) { |
3705 | char *params = strsep(&str, ")" ); |
3706 | |
3707 | if (!params) { |
3708 | hist_err(tr, err_type: HIST_ERR_NO_SAVE_PARAMS, err_pos: 0); |
3709 | ret = -EINVAL; |
3710 | goto out; |
3711 | } |
3712 | |
3713 | ret = parse_action_params(tr, params, data); |
3714 | if (ret) |
3715 | goto out; |
3716 | |
3717 | if (handler == HANDLER_ONMAX) |
3718 | data->track_data.check_val = check_track_val_max; |
3719 | else if (handler == HANDLER_ONCHANGE) |
3720 | data->track_data.check_val = check_track_val_changed; |
3721 | else { |
3722 | hist_err(tr, err_type: HIST_ERR_ACTION_MISMATCH, err_pos: errpos(str: action_name)); |
3723 | ret = -EINVAL; |
3724 | goto out; |
3725 | } |
3726 | |
3727 | data->track_data.save_data = save_track_data_vars; |
3728 | data->fn = ontrack_action; |
3729 | data->action = ACTION_SAVE; |
3730 | } else if (str_has_prefix(str: action_name, prefix: "snapshot" )) { |
3731 | char *params = strsep(&str, ")" ); |
3732 | |
3733 | if (!str) { |
3734 | hist_err(tr, err_type: HIST_ERR_NO_CLOSING_PAREN, err_pos: errpos(str: params)); |
3735 | ret = -EINVAL; |
3736 | goto out; |
3737 | } |
3738 | |
3739 | if (handler == HANDLER_ONMAX) |
3740 | data->track_data.check_val = check_track_val_max; |
3741 | else if (handler == HANDLER_ONCHANGE) |
3742 | data->track_data.check_val = check_track_val_changed; |
3743 | else { |
3744 | hist_err(tr, err_type: HIST_ERR_ACTION_MISMATCH, err_pos: errpos(str: action_name)); |
3745 | ret = -EINVAL; |
3746 | goto out; |
3747 | } |
3748 | |
3749 | data->track_data.save_data = save_track_data_snapshot; |
3750 | data->fn = ontrack_action; |
3751 | data->action = ACTION_SNAPSHOT; |
3752 | } else { |
3753 | char *params = strsep(&str, ")" ); |
3754 | |
3755 | if (str_has_prefix(str: action_name, prefix: "trace" )) |
3756 | data->use_trace_keyword = true; |
3757 | |
3758 | if (params) { |
3759 | ret = parse_action_params(tr, params, data); |
3760 | if (ret) |
3761 | goto out; |
3762 | } |
3763 | |
3764 | if (handler == HANDLER_ONMAX) |
3765 | data->track_data.check_val = check_track_val_max; |
3766 | else if (handler == HANDLER_ONCHANGE) |
3767 | data->track_data.check_val = check_track_val_changed; |
3768 | |
3769 | if (handler != HANDLER_ONMATCH) { |
3770 | data->track_data.save_data = action_trace; |
3771 | data->fn = ontrack_action; |
3772 | } else |
3773 | data->fn = action_trace; |
3774 | |
3775 | data->action = ACTION_TRACE; |
3776 | } |
3777 | |
3778 | data->action_name = kstrdup(s: action_name, GFP_KERNEL); |
3779 | if (!data->action_name) { |
3780 | ret = -ENOMEM; |
3781 | goto out; |
3782 | } |
3783 | |
3784 | data->handler = handler; |
3785 | out: |
3786 | return ret; |
3787 | } |
3788 | |
3789 | static struct action_data *track_data_parse(struct hist_trigger_data *hist_data, |
3790 | char *str, enum handler_id handler) |
3791 | { |
3792 | struct action_data *data; |
3793 | int ret = -EINVAL; |
3794 | char *var_str; |
3795 | |
3796 | data = kzalloc(size: sizeof(*data), GFP_KERNEL); |
3797 | if (!data) |
3798 | return ERR_PTR(error: -ENOMEM); |
3799 | |
3800 | var_str = strsep(&str, ")" ); |
3801 | if (!var_str || !str) { |
3802 | ret = -EINVAL; |
3803 | goto free; |
3804 | } |
3805 | |
3806 | data->track_data.var_str = kstrdup(s: var_str, GFP_KERNEL); |
3807 | if (!data->track_data.var_str) { |
3808 | ret = -ENOMEM; |
3809 | goto free; |
3810 | } |
3811 | |
3812 | ret = action_parse(tr: hist_data->event_file->tr, str, data, handler); |
3813 | if (ret) |
3814 | goto free; |
3815 | out: |
3816 | return data; |
3817 | free: |
3818 | track_data_destroy(hist_data, data); |
3819 | data = ERR_PTR(error: ret); |
3820 | goto out; |
3821 | } |
3822 | |
3823 | static void onmatch_destroy(struct action_data *data) |
3824 | { |
3825 | kfree(objp: data->match_data.event); |
3826 | kfree(objp: data->match_data.event_system); |
3827 | |
3828 | action_data_destroy(data); |
3829 | } |
3830 | |
3831 | static void destroy_field_var(struct field_var *field_var) |
3832 | { |
3833 | if (!field_var) |
3834 | return; |
3835 | |
3836 | destroy_hist_field(hist_field: field_var->var, level: 0); |
3837 | destroy_hist_field(hist_field: field_var->val, level: 0); |
3838 | |
3839 | kfree(objp: field_var); |
3840 | } |
3841 | |
3842 | static void destroy_field_vars(struct hist_trigger_data *hist_data) |
3843 | { |
3844 | unsigned int i; |
3845 | |
3846 | for (i = 0; i < hist_data->n_field_vars; i++) |
3847 | destroy_field_var(field_var: hist_data->field_vars[i]); |
3848 | |
3849 | for (i = 0; i < hist_data->n_save_vars; i++) |
3850 | destroy_field_var(field_var: hist_data->save_vars[i]); |
3851 | } |
3852 | |
3853 | static void save_field_var(struct hist_trigger_data *hist_data, |
3854 | struct field_var *field_var) |
3855 | { |
3856 | hist_data->field_vars[hist_data->n_field_vars++] = field_var; |
3857 | |
3858 | /* Stack traces are saved in the string storage too */ |
3859 | if (field_var->val->flags & (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE)) |
3860 | hist_data->n_field_var_str++; |
3861 | } |
3862 | |
3863 | |
3864 | static int check_synth_field(struct synth_event *event, |
3865 | struct hist_field *hist_field, |
3866 | unsigned int field_pos) |
3867 | { |
3868 | struct synth_field *field; |
3869 | |
3870 | if (field_pos >= event->n_fields) |
3871 | return -EINVAL; |
3872 | |
3873 | field = event->fields[field_pos]; |
3874 | |
3875 | /* |
3876 | * A dynamic string synth field can accept static or |
3877 | * dynamic. A static string synth field can only accept a |
3878 | * same-sized static string, which is checked for later. |
3879 | */ |
3880 | if (strstr(hist_field->type, "char[" ) && field->is_string |
3881 | && field->is_dynamic) |
3882 | return 0; |
3883 | |
3884 | if (strstr(hist_field->type, "long[" ) && field->is_stack) |
3885 | return 0; |
3886 | |
3887 | if (strcmp(field->type, hist_field->type) != 0) { |
3888 | if (field->size != hist_field->size || |
3889 | (!field->is_string && field->is_signed != hist_field->is_signed)) |
3890 | return -EINVAL; |
3891 | } |
3892 | |
3893 | return 0; |
3894 | } |
3895 | |
3896 | static struct hist_field * |
3897 | trace_action_find_var(struct hist_trigger_data *hist_data, |
3898 | struct action_data *data, |
3899 | char *system, char *event, char *var) |
3900 | { |
3901 | struct trace_array *tr = hist_data->event_file->tr; |
3902 | struct hist_field *hist_field; |
3903 | |
3904 | var++; /* skip '$' */ |
3905 | |
3906 | hist_field = find_target_event_var(hist_data, subsys_name: system, event_name: event, var_name: var); |
3907 | if (!hist_field) { |
3908 | if (!system && data->handler == HANDLER_ONMATCH) { |
3909 | system = data->match_data.event_system; |
3910 | event = data->match_data.event; |
3911 | } |
3912 | |
3913 | hist_field = find_event_var(hist_data, system, event_name: event, var_name: var); |
3914 | } |
3915 | |
3916 | if (!hist_field) |
3917 | hist_err(tr, err_type: HIST_ERR_PARAM_NOT_FOUND, err_pos: errpos(str: var)); |
3918 | |
3919 | return hist_field; |
3920 | } |
3921 | |
3922 | static struct hist_field * |
3923 | trace_action_create_field_var(struct hist_trigger_data *hist_data, |
3924 | struct action_data *data, char *system, |
3925 | char *event, char *var) |
3926 | { |
3927 | struct hist_field *hist_field = NULL; |
3928 | struct field_var *field_var; |
3929 | |
3930 | /* |
3931 | * First try to create a field var on the target event (the |
3932 | * currently being defined). This will create a variable for |
3933 | * unqualified fields on the target event, or if qualified, |
3934 | * target fields that have qualified names matching the target. |
3935 | */ |
3936 | field_var = create_target_field_var(target_hist_data: hist_data, subsys_name: system, event_name: event, var_name: var); |
3937 | |
3938 | if (field_var && !IS_ERR(ptr: field_var)) { |
3939 | save_field_var(hist_data, field_var); |
3940 | hist_field = field_var->var; |
3941 | } else { |
3942 | field_var = NULL; |
3943 | /* |
3944 | * If no explicit system.event is specified, default to |
3945 | * looking for fields on the onmatch(system.event.xxx) |
3946 | * event. |
3947 | */ |
3948 | if (!system && data->handler == HANDLER_ONMATCH) { |
3949 | system = data->match_data.event_system; |
3950 | event = data->match_data.event; |
3951 | } |
3952 | |
3953 | if (!event) |
3954 | goto free; |
3955 | /* |
3956 | * At this point, we're looking at a field on another |
3957 | * event. Because we can't modify a hist trigger on |
3958 | * another event to add a variable for a field, we need |
3959 | * to create a new trigger on that event and create the |
3960 | * variable at the same time. |
3961 | */ |
3962 | hist_field = create_field_var_hist(target_hist_data: hist_data, subsys_name: system, event_name: event, field_name: var); |
3963 | if (IS_ERR(ptr: hist_field)) |
3964 | goto free; |
3965 | } |
3966 | out: |
3967 | return hist_field; |
3968 | free: |
3969 | destroy_field_var(field_var); |
3970 | hist_field = NULL; |
3971 | goto out; |
3972 | } |
3973 | |
3974 | static int trace_action_create(struct hist_trigger_data *hist_data, |
3975 | struct action_data *data) |
3976 | { |
3977 | struct trace_array *tr = hist_data->event_file->tr; |
3978 | char *event_name, *param, *system = NULL; |
3979 | struct hist_field *hist_field, *var_ref; |
3980 | unsigned int i; |
3981 | unsigned int field_pos = 0; |
3982 | struct synth_event *event; |
3983 | char *synth_event_name; |
3984 | int var_ref_idx, ret = 0; |
3985 | |
3986 | lockdep_assert_held(&event_mutex); |
3987 | |
3988 | /* Sanity check to avoid out-of-bound write on 'data->var_ref_idx' */ |
3989 | if (data->n_params > SYNTH_FIELDS_MAX) |
3990 | return -EINVAL; |
3991 | |
3992 | if (data->use_trace_keyword) |
3993 | synth_event_name = data->synth_event_name; |
3994 | else |
3995 | synth_event_name = data->action_name; |
3996 | |
3997 | event = find_synth_event(name: synth_event_name); |
3998 | if (!event) { |
3999 | hist_err(tr, err_type: HIST_ERR_SYNTH_EVENT_NOT_FOUND, err_pos: errpos(str: synth_event_name)); |
4000 | return -EINVAL; |
4001 | } |
4002 | |
4003 | event->ref++; |
4004 | |
4005 | for (i = 0; i < data->n_params; i++) { |
4006 | char *p; |
4007 | |
4008 | p = param = kstrdup(s: data->params[i], GFP_KERNEL); |
4009 | if (!param) { |
4010 | ret = -ENOMEM; |
4011 | goto err; |
4012 | } |
4013 | |
4014 | system = strsep(¶m, "." ); |
4015 | if (!param) { |
4016 | param = (char *)system; |
4017 | system = event_name = NULL; |
4018 | } else { |
4019 | event_name = strsep(¶m, "." ); |
4020 | if (!param) { |
4021 | kfree(objp: p); |
4022 | ret = -EINVAL; |
4023 | goto err; |
4024 | } |
4025 | } |
4026 | |
4027 | if (param[0] == '$') |
4028 | hist_field = trace_action_find_var(hist_data, data, |
4029 | system, event: event_name, |
4030 | var: param); |
4031 | else |
4032 | hist_field = trace_action_create_field_var(hist_data, |
4033 | data, |
4034 | system, |
4035 | event: event_name, |
4036 | var: param); |
4037 | |
4038 | if (!hist_field) { |
4039 | kfree(objp: p); |
4040 | ret = -EINVAL; |
4041 | goto err; |
4042 | } |
4043 | |
4044 | if (check_synth_field(event, hist_field, field_pos) == 0) { |
4045 | var_ref = create_var_ref(hist_data, var_field: hist_field, |
4046 | system, event_name); |
4047 | if (!var_ref) { |
4048 | kfree(objp: p); |
4049 | ret = -ENOMEM; |
4050 | goto err; |
4051 | } |
4052 | |
4053 | var_ref_idx = find_var_ref_idx(hist_data, var_field: var_ref); |
4054 | if (WARN_ON(var_ref_idx < 0)) { |
4055 | kfree(objp: p); |
4056 | ret = var_ref_idx; |
4057 | goto err; |
4058 | } |
4059 | |
4060 | data->var_ref_idx[i] = var_ref_idx; |
4061 | |
4062 | field_pos++; |
4063 | kfree(objp: p); |
4064 | continue; |
4065 | } |
4066 | |
4067 | hist_err(tr, err_type: HIST_ERR_SYNTH_TYPE_MISMATCH, err_pos: errpos(str: param)); |
4068 | kfree(objp: p); |
4069 | ret = -EINVAL; |
4070 | goto err; |
4071 | } |
4072 | |
4073 | if (field_pos != event->n_fields) { |
4074 | hist_err(tr, err_type: HIST_ERR_SYNTH_COUNT_MISMATCH, err_pos: errpos(str: event->name)); |
4075 | ret = -EINVAL; |
4076 | goto err; |
4077 | } |
4078 | |
4079 | data->synth_event = event; |
4080 | out: |
4081 | return ret; |
4082 | err: |
4083 | event->ref--; |
4084 | |
4085 | goto out; |
4086 | } |
4087 | |
4088 | static int action_create(struct hist_trigger_data *hist_data, |
4089 | struct action_data *data) |
4090 | { |
4091 | struct trace_event_file *file = hist_data->event_file; |
4092 | struct trace_array *tr = file->tr; |
4093 | struct track_data *track_data; |
4094 | struct field_var *field_var; |
4095 | unsigned int i; |
4096 | char *param; |
4097 | int ret = 0; |
4098 | |
4099 | if (data->action == ACTION_TRACE) |
4100 | return trace_action_create(hist_data, data); |
4101 | |
4102 | if (data->action == ACTION_SNAPSHOT) { |
4103 | track_data = track_data_alloc(key_len: hist_data->key_size, action_data: data, hist_data); |
4104 | if (IS_ERR(ptr: track_data)) { |
4105 | ret = PTR_ERR(ptr: track_data); |
4106 | goto out; |
4107 | } |
4108 | |
4109 | ret = tracing_snapshot_cond_enable(tr: file->tr, cond_data: track_data, |
4110 | update: cond_snapshot_update); |
4111 | if (ret) |
4112 | track_data_free(track_data); |
4113 | |
4114 | goto out; |
4115 | } |
4116 | |
4117 | if (data->action == ACTION_SAVE) { |
4118 | if (hist_data->n_save_vars) { |
4119 | ret = -EEXIST; |
4120 | hist_err(tr, err_type: HIST_ERR_TOO_MANY_SAVE_ACTIONS, err_pos: 0); |
4121 | goto out; |
4122 | } |
4123 | |
4124 | for (i = 0; i < data->n_params; i++) { |
4125 | param = kstrdup(s: data->params[i], GFP_KERNEL); |
4126 | if (!param) { |
4127 | ret = -ENOMEM; |
4128 | goto out; |
4129 | } |
4130 | |
4131 | field_var = create_target_field_var(target_hist_data: hist_data, NULL, NULL, var_name: param); |
4132 | if (IS_ERR(ptr: field_var)) { |
4133 | hist_err(tr, err_type: HIST_ERR_FIELD_VAR_CREATE_FAIL, |
4134 | err_pos: errpos(str: param)); |
4135 | ret = PTR_ERR(ptr: field_var); |
4136 | kfree(objp: param); |
4137 | goto out; |
4138 | } |
4139 | |
4140 | hist_data->save_vars[hist_data->n_save_vars++] = field_var; |
4141 | if (field_var->val->flags & |
4142 | (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE)) |
4143 | hist_data->n_save_var_str++; |
4144 | kfree(objp: param); |
4145 | } |
4146 | } |
4147 | out: |
4148 | return ret; |
4149 | } |
4150 | |
4151 | static int onmatch_create(struct hist_trigger_data *hist_data, |
4152 | struct action_data *data) |
4153 | { |
4154 | return action_create(hist_data, data); |
4155 | } |
4156 | |
4157 | static struct action_data *onmatch_parse(struct trace_array *tr, char *str) |
4158 | { |
4159 | char *match_event, *match_event_system; |
4160 | struct action_data *data; |
4161 | int ret = -EINVAL; |
4162 | |
4163 | data = kzalloc(size: sizeof(*data), GFP_KERNEL); |
4164 | if (!data) |
4165 | return ERR_PTR(error: -ENOMEM); |
4166 | |
4167 | match_event = strsep(&str, ")" ); |
4168 | if (!match_event || !str) { |
4169 | hist_err(tr, err_type: HIST_ERR_NO_CLOSING_PAREN, err_pos: errpos(str: match_event)); |
4170 | goto free; |
4171 | } |
4172 | |
4173 | match_event_system = strsep(&match_event, "." ); |
4174 | if (!match_event) { |
4175 | hist_err(tr, err_type: HIST_ERR_SUBSYS_NOT_FOUND, err_pos: errpos(str: match_event_system)); |
4176 | goto free; |
4177 | } |
4178 | |
4179 | if (IS_ERR(ptr: event_file(tr, system: match_event_system, event_name: match_event))) { |
4180 | hist_err(tr, err_type: HIST_ERR_INVALID_SUBSYS_EVENT, err_pos: errpos(str: match_event)); |
4181 | goto free; |
4182 | } |
4183 | |
4184 | data->match_data.event = kstrdup(s: match_event, GFP_KERNEL); |
4185 | if (!data->match_data.event) { |
4186 | ret = -ENOMEM; |
4187 | goto free; |
4188 | } |
4189 | |
4190 | data->match_data.event_system = kstrdup(s: match_event_system, GFP_KERNEL); |
4191 | if (!data->match_data.event_system) { |
4192 | ret = -ENOMEM; |
4193 | goto free; |
4194 | } |
4195 | |
4196 | ret = action_parse(tr, str, data, handler: HANDLER_ONMATCH); |
4197 | if (ret) |
4198 | goto free; |
4199 | out: |
4200 | return data; |
4201 | free: |
4202 | onmatch_destroy(data); |
4203 | data = ERR_PTR(error: ret); |
4204 | goto out; |
4205 | } |
4206 | |
4207 | static int create_hitcount_val(struct hist_trigger_data *hist_data) |
4208 | { |
4209 | hist_data->fields[HITCOUNT_IDX] = |
4210 | create_hist_field(hist_data, NULL, flags: HIST_FIELD_FL_HITCOUNT, NULL); |
4211 | if (!hist_data->fields[HITCOUNT_IDX]) |
4212 | return -ENOMEM; |
4213 | |
4214 | hist_data->n_vals++; |
4215 | hist_data->n_fields++; |
4216 | |
4217 | if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX)) |
4218 | return -EINVAL; |
4219 | |
4220 | return 0; |
4221 | } |
4222 | |
4223 | static int __create_val_field(struct hist_trigger_data *hist_data, |
4224 | unsigned int val_idx, |
4225 | struct trace_event_file *file, |
4226 | char *var_name, char *field_str, |
4227 | unsigned long flags) |
4228 | { |
4229 | struct hist_field *hist_field; |
4230 | int ret = 0, n_subexprs = 0; |
4231 | |
4232 | hist_field = parse_expr(hist_data, file, str: field_str, flags, var_name, n_subexprs: &n_subexprs); |
4233 | if (IS_ERR(ptr: hist_field)) { |
4234 | ret = PTR_ERR(ptr: hist_field); |
4235 | goto out; |
4236 | } |
4237 | |
4238 | /* values and variables should not have some modifiers */ |
4239 | if (hist_field->flags & HIST_FIELD_FL_VAR) { |
4240 | /* Variable */ |
4241 | if (hist_field->flags & (HIST_FIELD_FL_GRAPH | HIST_FIELD_FL_PERCENT | |
4242 | HIST_FIELD_FL_BUCKET | HIST_FIELD_FL_LOG2)) |
4243 | goto err; |
4244 | } else { |
4245 | /* Value */ |
4246 | if (hist_field->flags & (HIST_FIELD_FL_GRAPH | HIST_FIELD_FL_PERCENT | |
4247 | HIST_FIELD_FL_BUCKET | HIST_FIELD_FL_LOG2 | |
4248 | HIST_FIELD_FL_SYM | HIST_FIELD_FL_SYM_OFFSET | |
4249 | HIST_FIELD_FL_SYSCALL | HIST_FIELD_FL_STACKTRACE)) |
4250 | goto err; |
4251 | } |
4252 | |
4253 | hist_data->fields[val_idx] = hist_field; |
4254 | |
4255 | ++hist_data->n_vals; |
4256 | ++hist_data->n_fields; |
4257 | |
4258 | if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) |
4259 | ret = -EINVAL; |
4260 | out: |
4261 | return ret; |
4262 | err: |
4263 | hist_err(tr: file->tr, err_type: HIST_ERR_BAD_FIELD_MODIFIER, err_pos: errpos(str: field_str)); |
4264 | return -EINVAL; |
4265 | } |
4266 | |
4267 | static int create_val_field(struct hist_trigger_data *hist_data, |
4268 | unsigned int val_idx, |
4269 | struct trace_event_file *file, |
4270 | char *field_str) |
4271 | { |
4272 | if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX)) |
4273 | return -EINVAL; |
4274 | |
4275 | return __create_val_field(hist_data, val_idx, file, NULL, field_str, flags: 0); |
4276 | } |
4277 | |
4278 | static const char no_comm[] = "(no comm)" ; |
4279 | |
4280 | static u64 hist_field_execname(struct hist_field *hist_field, |
4281 | struct tracing_map_elt *elt, |
4282 | struct trace_buffer *buffer, |
4283 | struct ring_buffer_event *rbe, |
4284 | void *event) |
4285 | { |
4286 | struct hist_elt_data *elt_data; |
4287 | |
4288 | if (WARN_ON_ONCE(!elt)) |
4289 | return (u64)(unsigned long)no_comm; |
4290 | |
4291 | elt_data = elt->private_data; |
4292 | |
4293 | if (WARN_ON_ONCE(!elt_data->comm)) |
4294 | return (u64)(unsigned long)no_comm; |
4295 | |
4296 | return (u64)(unsigned long)(elt_data->comm); |
4297 | } |
4298 | |
4299 | static u64 hist_field_stack(struct hist_field *hist_field, |
4300 | struct tracing_map_elt *elt, |
4301 | struct trace_buffer *buffer, |
4302 | struct ring_buffer_event *rbe, |
4303 | void *event) |
4304 | { |
4305 | u32 str_item = *(u32 *)(event + hist_field->field->offset); |
4306 | int str_loc = str_item & 0xffff; |
4307 | char *addr = (char *)(event + str_loc); |
4308 | |
4309 | return (u64)(unsigned long)addr; |
4310 | } |
4311 | |
4312 | static u64 hist_fn_call(struct hist_field *hist_field, |
4313 | struct tracing_map_elt *elt, |
4314 | struct trace_buffer *buffer, |
4315 | struct ring_buffer_event *rbe, |
4316 | void *event) |
4317 | { |
4318 | switch (hist_field->fn_num) { |
4319 | case HIST_FIELD_FN_VAR_REF: |
4320 | return hist_field_var_ref(hist_field, elt, buffer, rbe, event); |
4321 | case HIST_FIELD_FN_COUNTER: |
4322 | return hist_field_counter(field: hist_field, elt, buffer, rbe, event); |
4323 | case HIST_FIELD_FN_CONST: |
4324 | return hist_field_const(field: hist_field, elt, buffer, rbe, event); |
4325 | case HIST_FIELD_FN_LOG2: |
4326 | return hist_field_log2(hist_field, elt, buffer, rbe, event); |
4327 | case HIST_FIELD_FN_BUCKET: |
4328 | return hist_field_bucket(hist_field, elt, buffer, rbe, event); |
4329 | case HIST_FIELD_FN_TIMESTAMP: |
4330 | return hist_field_timestamp(hist_field, elt, buffer, rbe, event); |
4331 | case HIST_FIELD_FN_CPU: |
4332 | return hist_field_cpu(hist_field, elt, buffer, rbe, event); |
4333 | case HIST_FIELD_FN_STRING: |
4334 | return hist_field_string(hist_field, elt, buffer, rbe, event); |
4335 | case HIST_FIELD_FN_DYNSTRING: |
4336 | return hist_field_dynstring(hist_field, elt, buffer, rbe, event); |
4337 | case HIST_FIELD_FN_RELDYNSTRING: |
4338 | return hist_field_reldynstring(hist_field, elt, buffer, rbe, event); |
4339 | case HIST_FIELD_FN_PSTRING: |
4340 | return hist_field_pstring(hist_field, elt, buffer, rbe, event); |
4341 | case HIST_FIELD_FN_S64: |
4342 | return hist_field_s64(hist_field, elt, buffer, rbe, event); |
4343 | case HIST_FIELD_FN_U64: |
4344 | return hist_field_u64(hist_field, elt, buffer, rbe, event); |
4345 | case HIST_FIELD_FN_S32: |
4346 | return hist_field_s32(hist_field, elt, buffer, rbe, event); |
4347 | case HIST_FIELD_FN_U32: |
4348 | return hist_field_u32(hist_field, elt, buffer, rbe, event); |
4349 | case HIST_FIELD_FN_S16: |
4350 | return hist_field_s16(hist_field, elt, buffer, rbe, event); |
4351 | case HIST_FIELD_FN_U16: |
4352 | return hist_field_u16(hist_field, elt, buffer, rbe, event); |
4353 | case HIST_FIELD_FN_S8: |
4354 | return hist_field_s8(hist_field, elt, buffer, rbe, event); |
4355 | case HIST_FIELD_FN_U8: |
4356 | return hist_field_u8(hist_field, elt, buffer, rbe, event); |
4357 | case HIST_FIELD_FN_UMINUS: |
4358 | return hist_field_unary_minus(hist_field, elt, buffer, rbe, event); |
4359 | case HIST_FIELD_FN_MINUS: |
4360 | return hist_field_minus(hist_field, elt, buffer, rbe, event); |
4361 | case HIST_FIELD_FN_PLUS: |
4362 | return hist_field_plus(hist_field, elt, buffer, rbe, event); |
4363 | case HIST_FIELD_FN_DIV: |
4364 | return hist_field_div(hist_field, elt, buffer, rbe, event); |
4365 | case HIST_FIELD_FN_MULT: |
4366 | return hist_field_mult(hist_field, elt, buffer, rbe, event); |
4367 | case HIST_FIELD_FN_DIV_POWER2: |
4368 | return div_by_power_of_two(hist_field, elt, buffer, rbe, event); |
4369 | case HIST_FIELD_FN_DIV_NOT_POWER2: |
4370 | return div_by_not_power_of_two(hist_field, elt, buffer, rbe, event); |
4371 | case HIST_FIELD_FN_DIV_MULT_SHIFT: |
4372 | return div_by_mult_and_shift(hist_field, elt, buffer, rbe, event); |
4373 | case HIST_FIELD_FN_EXECNAME: |
4374 | return hist_field_execname(hist_field, elt, buffer, rbe, event); |
4375 | case HIST_FIELD_FN_STACK: |
4376 | return hist_field_stack(hist_field, elt, buffer, rbe, event); |
4377 | default: |
4378 | return 0; |
4379 | } |
4380 | } |
4381 | |
4382 | /* Convert a var that points to common_pid.execname to a string */ |
4383 | static void update_var_execname(struct hist_field *hist_field) |
4384 | { |
4385 | hist_field->flags = HIST_FIELD_FL_STRING | HIST_FIELD_FL_VAR | |
4386 | HIST_FIELD_FL_EXECNAME; |
4387 | hist_field->size = MAX_FILTER_STR_VAL; |
4388 | hist_field->is_signed = 0; |
4389 | |
4390 | kfree_const(x: hist_field->type); |
4391 | hist_field->type = "char[]" ; |
4392 | |
4393 | hist_field->fn_num = HIST_FIELD_FN_EXECNAME; |
4394 | } |
4395 | |
4396 | static int create_var_field(struct hist_trigger_data *hist_data, |
4397 | unsigned int val_idx, |
4398 | struct trace_event_file *file, |
4399 | char *var_name, char *expr_str) |
4400 | { |
4401 | struct trace_array *tr = hist_data->event_file->tr; |
4402 | unsigned long flags = 0; |
4403 | int ret; |
4404 | |
4405 | if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) |
4406 | return -EINVAL; |
4407 | |
4408 | if (find_var(hist_data, file, var_name) && !hist_data->remove) { |
4409 | hist_err(tr, err_type: HIST_ERR_DUPLICATE_VAR, err_pos: errpos(str: var_name)); |
4410 | return -EINVAL; |
4411 | } |
4412 | |
4413 | flags |= HIST_FIELD_FL_VAR; |
4414 | hist_data->n_vars++; |
4415 | if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX)) |
4416 | return -EINVAL; |
4417 | |
4418 | ret = __create_val_field(hist_data, val_idx, file, var_name, field_str: expr_str, flags); |
4419 | |
4420 | if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_EXECNAME) |
4421 | update_var_execname(hist_field: hist_data->fields[val_idx]); |
4422 | |
4423 | if (!ret && hist_data->fields[val_idx]->flags & |
4424 | (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE)) |
4425 | hist_data->fields[val_idx]->var_str_idx = hist_data->n_var_str++; |
4426 | |
4427 | return ret; |
4428 | } |
4429 | |
4430 | static int create_val_fields(struct hist_trigger_data *hist_data, |
4431 | struct trace_event_file *file) |
4432 | { |
4433 | unsigned int i, j = 1, n_hitcount = 0; |
4434 | char *fields_str, *field_str; |
4435 | int ret; |
4436 | |
4437 | ret = create_hitcount_val(hist_data); |
4438 | if (ret) |
4439 | goto out; |
4440 | |
4441 | fields_str = hist_data->attrs->vals_str; |
4442 | if (!fields_str) |
4443 | goto out; |
4444 | |
4445 | for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX && |
4446 | j < TRACING_MAP_VALS_MAX; i++) { |
4447 | field_str = strsep(&fields_str, "," ); |
4448 | if (!field_str) |
4449 | break; |
4450 | |
4451 | if (strcmp(field_str, "hitcount" ) == 0) { |
4452 | if (!n_hitcount++) |
4453 | continue; |
4454 | } |
4455 | |
4456 | ret = create_val_field(hist_data, val_idx: j++, file, field_str); |
4457 | if (ret) |
4458 | goto out; |
4459 | } |
4460 | |
4461 | if (fields_str && (strcmp(fields_str, "hitcount" ) != 0)) |
4462 | ret = -EINVAL; |
4463 | out: |
4464 | /* There is only raw hitcount but nohitcount suppresses it. */ |
4465 | if (j == 1 && hist_data->attrs->no_hitcount) { |
4466 | hist_err(tr: hist_data->event_file->tr, err_type: HIST_ERR_NEED_NOHC_VAL, err_pos: 0); |
4467 | ret = -ENOENT; |
4468 | } |
4469 | |
4470 | return ret; |
4471 | } |
4472 | |
4473 | static int create_key_field(struct hist_trigger_data *hist_data, |
4474 | unsigned int key_idx, |
4475 | unsigned int key_offset, |
4476 | struct trace_event_file *file, |
4477 | char *field_str) |
4478 | { |
4479 | struct trace_array *tr = hist_data->event_file->tr; |
4480 | struct hist_field *hist_field = NULL; |
4481 | unsigned long flags = 0; |
4482 | unsigned int key_size; |
4483 | int ret = 0, n_subexprs = 0; |
4484 | |
4485 | if (WARN_ON(key_idx >= HIST_FIELDS_MAX)) |
4486 | return -EINVAL; |
4487 | |
4488 | flags |= HIST_FIELD_FL_KEY; |
4489 | |
4490 | if (strcmp(field_str, "stacktrace" ) == 0) { |
4491 | flags |= HIST_FIELD_FL_STACKTRACE; |
4492 | key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH; |
4493 | hist_field = create_hist_field(hist_data, NULL, flags, NULL); |
4494 | } else { |
4495 | hist_field = parse_expr(hist_data, file, str: field_str, flags, |
4496 | NULL, n_subexprs: &n_subexprs); |
4497 | if (IS_ERR(ptr: hist_field)) { |
4498 | ret = PTR_ERR(ptr: hist_field); |
4499 | goto out; |
4500 | } |
4501 | |
4502 | if (field_has_hist_vars(hist_field, level: 0)) { |
4503 | hist_err(tr, err_type: HIST_ERR_INVALID_REF_KEY, err_pos: errpos(str: field_str)); |
4504 | destroy_hist_field(hist_field, level: 0); |
4505 | ret = -EINVAL; |
4506 | goto out; |
4507 | } |
4508 | |
4509 | key_size = hist_field->size; |
4510 | } |
4511 | |
4512 | hist_data->fields[key_idx] = hist_field; |
4513 | |
4514 | key_size = ALIGN(key_size, sizeof(u64)); |
4515 | hist_data->fields[key_idx]->size = key_size; |
4516 | hist_data->fields[key_idx]->offset = key_offset; |
4517 | |
4518 | hist_data->key_size += key_size; |
4519 | |
4520 | if (hist_data->key_size > HIST_KEY_SIZE_MAX) { |
4521 | ret = -EINVAL; |
4522 | goto out; |
4523 | } |
4524 | |
4525 | hist_data->n_keys++; |
4526 | hist_data->n_fields++; |
4527 | |
4528 | if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX)) |
4529 | return -EINVAL; |
4530 | |
4531 | ret = key_size; |
4532 | out: |
4533 | return ret; |
4534 | } |
4535 | |
4536 | static int create_key_fields(struct hist_trigger_data *hist_data, |
4537 | struct trace_event_file *file) |
4538 | { |
4539 | unsigned int i, key_offset = 0, n_vals = hist_data->n_vals; |
4540 | char *fields_str, *field_str; |
4541 | int ret = -EINVAL; |
4542 | |
4543 | fields_str = hist_data->attrs->keys_str; |
4544 | if (!fields_str) |
4545 | goto out; |
4546 | |
4547 | for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) { |
4548 | field_str = strsep(&fields_str, "," ); |
4549 | if (!field_str) |
4550 | break; |
4551 | ret = create_key_field(hist_data, key_idx: i, key_offset, |
4552 | file, field_str); |
4553 | if (ret < 0) |
4554 | goto out; |
4555 | key_offset += ret; |
4556 | } |
4557 | if (fields_str) { |
4558 | ret = -EINVAL; |
4559 | goto out; |
4560 | } |
4561 | ret = 0; |
4562 | out: |
4563 | return ret; |
4564 | } |
4565 | |
4566 | static int create_var_fields(struct hist_trigger_data *hist_data, |
4567 | struct trace_event_file *file) |
4568 | { |
4569 | unsigned int i, j = hist_data->n_vals; |
4570 | int ret = 0; |
4571 | |
4572 | unsigned int n_vars = hist_data->attrs->var_defs.n_vars; |
4573 | |
4574 | for (i = 0; i < n_vars; i++) { |
4575 | char *var_name = hist_data->attrs->var_defs.name[i]; |
4576 | char *expr = hist_data->attrs->var_defs.expr[i]; |
4577 | |
4578 | ret = create_var_field(hist_data, val_idx: j++, file, var_name, expr_str: expr); |
4579 | if (ret) |
4580 | goto out; |
4581 | } |
4582 | out: |
4583 | return ret; |
4584 | } |
4585 | |
4586 | static void free_var_defs(struct hist_trigger_data *hist_data) |
4587 | { |
4588 | unsigned int i; |
4589 | |
4590 | for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { |
4591 | kfree(objp: hist_data->attrs->var_defs.name[i]); |
4592 | kfree(objp: hist_data->attrs->var_defs.expr[i]); |
4593 | } |
4594 | |
4595 | hist_data->attrs->var_defs.n_vars = 0; |
4596 | } |
4597 | |
4598 | static int parse_var_defs(struct hist_trigger_data *hist_data) |
4599 | { |
4600 | struct trace_array *tr = hist_data->event_file->tr; |
4601 | char *s, *str, *var_name, *field_str; |
4602 | unsigned int i, j, n_vars = 0; |
4603 | int ret = 0; |
4604 | |
4605 | for (i = 0; i < hist_data->attrs->n_assignments; i++) { |
4606 | str = hist_data->attrs->assignment_str[i]; |
4607 | for (j = 0; j < TRACING_MAP_VARS_MAX; j++) { |
4608 | field_str = strsep(&str, "," ); |
4609 | if (!field_str) |
4610 | break; |
4611 | |
4612 | var_name = strsep(&field_str, "=" ); |
4613 | if (!var_name || !field_str) { |
4614 | hist_err(tr, err_type: HIST_ERR_MALFORMED_ASSIGNMENT, |
4615 | err_pos: errpos(str: var_name)); |
4616 | ret = -EINVAL; |
4617 | goto free; |
4618 | } |
4619 | |
4620 | if (n_vars == TRACING_MAP_VARS_MAX) { |
4621 | hist_err(tr, err_type: HIST_ERR_TOO_MANY_VARS, err_pos: errpos(str: var_name)); |
4622 | ret = -EINVAL; |
4623 | goto free; |
4624 | } |
4625 | |
4626 | s = kstrdup(s: var_name, GFP_KERNEL); |
4627 | if (!s) { |
4628 | ret = -ENOMEM; |
4629 | goto free; |
4630 | } |
4631 | hist_data->attrs->var_defs.name[n_vars] = s; |
4632 | |
4633 | s = kstrdup(s: field_str, GFP_KERNEL); |
4634 | if (!s) { |
4635 | kfree(objp: hist_data->attrs->var_defs.name[n_vars]); |
4636 | hist_data->attrs->var_defs.name[n_vars] = NULL; |
4637 | ret = -ENOMEM; |
4638 | goto free; |
4639 | } |
4640 | hist_data->attrs->var_defs.expr[n_vars++] = s; |
4641 | |
4642 | hist_data->attrs->var_defs.n_vars = n_vars; |
4643 | } |
4644 | } |
4645 | |
4646 | return ret; |
4647 | free: |
4648 | free_var_defs(hist_data); |
4649 | |
4650 | return ret; |
4651 | } |
4652 | |
4653 | static int create_hist_fields(struct hist_trigger_data *hist_data, |
4654 | struct trace_event_file *file) |
4655 | { |
4656 | int ret; |
4657 | |
4658 | ret = parse_var_defs(hist_data); |
4659 | if (ret) |
4660 | return ret; |
4661 | |
4662 | ret = create_val_fields(hist_data, file); |
4663 | if (ret) |
4664 | goto out; |
4665 | |
4666 | ret = create_var_fields(hist_data, file); |
4667 | if (ret) |
4668 | goto out; |
4669 | |
4670 | ret = create_key_fields(hist_data, file); |
4671 | |
4672 | out: |
4673 | free_var_defs(hist_data); |
4674 | |
4675 | return ret; |
4676 | } |
4677 | |
4678 | static int is_descending(struct trace_array *tr, const char *str) |
4679 | { |
4680 | if (!str) |
4681 | return 0; |
4682 | |
4683 | if (strcmp(str, "descending" ) == 0) |
4684 | return 1; |
4685 | |
4686 | if (strcmp(str, "ascending" ) == 0) |
4687 | return 0; |
4688 | |
4689 | hist_err(tr, err_type: HIST_ERR_INVALID_SORT_MODIFIER, err_pos: errpos(str: (char *)str)); |
4690 | |
4691 | return -EINVAL; |
4692 | } |
4693 | |
4694 | static int create_sort_keys(struct hist_trigger_data *hist_data) |
4695 | { |
4696 | struct trace_array *tr = hist_data->event_file->tr; |
4697 | char *fields_str = hist_data->attrs->sort_key_str; |
4698 | struct tracing_map_sort_key *sort_key; |
4699 | int descending, ret = 0; |
4700 | unsigned int i, j, k; |
4701 | |
4702 | hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */ |
4703 | |
4704 | if (!fields_str) |
4705 | goto out; |
4706 | |
4707 | for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) { |
4708 | struct hist_field *hist_field; |
4709 | char *field_str, *field_name; |
4710 | const char *test_name; |
4711 | |
4712 | sort_key = &hist_data->sort_keys[i]; |
4713 | |
4714 | field_str = strsep(&fields_str, "," ); |
4715 | if (!field_str) |
4716 | break; |
4717 | |
4718 | if (!*field_str) { |
4719 | ret = -EINVAL; |
4720 | hist_err(tr, err_type: HIST_ERR_EMPTY_SORT_FIELD, err_pos: errpos(str: "sort=" )); |
4721 | break; |
4722 | } |
4723 | |
4724 | if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) { |
4725 | hist_err(tr, err_type: HIST_ERR_TOO_MANY_SORT_FIELDS, err_pos: errpos(str: "sort=" )); |
4726 | ret = -EINVAL; |
4727 | break; |
4728 | } |
4729 | |
4730 | field_name = strsep(&field_str, "." ); |
4731 | if (!field_name || !*field_name) { |
4732 | ret = -EINVAL; |
4733 | hist_err(tr, err_type: HIST_ERR_EMPTY_SORT_FIELD, err_pos: errpos(str: "sort=" )); |
4734 | break; |
4735 | } |
4736 | |
4737 | if (strcmp(field_name, "hitcount" ) == 0) { |
4738 | descending = is_descending(tr, str: field_str); |
4739 | if (descending < 0) { |
4740 | ret = descending; |
4741 | break; |
4742 | } |
4743 | sort_key->descending = descending; |
4744 | continue; |
4745 | } |
4746 | |
4747 | for (j = 1, k = 1; j < hist_data->n_fields; j++) { |
4748 | unsigned int idx; |
4749 | |
4750 | hist_field = hist_data->fields[j]; |
4751 | if (hist_field->flags & HIST_FIELD_FL_VAR) |
4752 | continue; |
4753 | |
4754 | idx = k++; |
4755 | |
4756 | test_name = hist_field_name(field: hist_field, level: 0); |
4757 | |
4758 | if (strcmp(field_name, test_name) == 0) { |
4759 | sort_key->field_idx = idx; |
4760 | descending = is_descending(tr, str: field_str); |
4761 | if (descending < 0) { |
4762 | ret = descending; |
4763 | goto out; |
4764 | } |
4765 | sort_key->descending = descending; |
4766 | break; |
4767 | } |
4768 | } |
4769 | if (j == hist_data->n_fields) { |
4770 | ret = -EINVAL; |
4771 | hist_err(tr, err_type: HIST_ERR_INVALID_SORT_FIELD, err_pos: errpos(str: field_name)); |
4772 | break; |
4773 | } |
4774 | } |
4775 | |
4776 | hist_data->n_sort_keys = i; |
4777 | out: |
4778 | return ret; |
4779 | } |
4780 | |
4781 | static void destroy_actions(struct hist_trigger_data *hist_data) |
4782 | { |
4783 | unsigned int i; |
4784 | |
4785 | for (i = 0; i < hist_data->n_actions; i++) { |
4786 | struct action_data *data = hist_data->actions[i]; |
4787 | |
4788 | if (data->handler == HANDLER_ONMATCH) |
4789 | onmatch_destroy(data); |
4790 | else if (data->handler == HANDLER_ONMAX || |
4791 | data->handler == HANDLER_ONCHANGE) |
4792 | track_data_destroy(hist_data, data); |
4793 | else |
4794 | kfree(objp: data); |
4795 | } |
4796 | } |
4797 | |
4798 | static int parse_actions(struct hist_trigger_data *hist_data) |
4799 | { |
4800 | struct trace_array *tr = hist_data->event_file->tr; |
4801 | struct action_data *data; |
4802 | unsigned int i; |
4803 | int ret = 0; |
4804 | char *str; |
4805 | int len; |
4806 | |
4807 | for (i = 0; i < hist_data->attrs->n_actions; i++) { |
4808 | str = hist_data->attrs->action_str[i]; |
4809 | |
4810 | if ((len = str_has_prefix(str, prefix: "onmatch(" ))) { |
4811 | char *action_str = str + len; |
4812 | |
4813 | data = onmatch_parse(tr, str: action_str); |
4814 | if (IS_ERR(ptr: data)) { |
4815 | ret = PTR_ERR(ptr: data); |
4816 | break; |
4817 | } |
4818 | } else if ((len = str_has_prefix(str, prefix: "onmax(" ))) { |
4819 | char *action_str = str + len; |
4820 | |
4821 | data = track_data_parse(hist_data, str: action_str, |
4822 | handler: HANDLER_ONMAX); |
4823 | if (IS_ERR(ptr: data)) { |
4824 | ret = PTR_ERR(ptr: data); |
4825 | break; |
4826 | } |
4827 | } else if ((len = str_has_prefix(str, prefix: "onchange(" ))) { |
4828 | char *action_str = str + len; |
4829 | |
4830 | data = track_data_parse(hist_data, str: action_str, |
4831 | handler: HANDLER_ONCHANGE); |
4832 | if (IS_ERR(ptr: data)) { |
4833 | ret = PTR_ERR(ptr: data); |
4834 | break; |
4835 | } |
4836 | } else { |
4837 | ret = -EINVAL; |
4838 | break; |
4839 | } |
4840 | |
4841 | hist_data->actions[hist_data->n_actions++] = data; |
4842 | } |
4843 | |
4844 | return ret; |
4845 | } |
4846 | |
4847 | static int create_actions(struct hist_trigger_data *hist_data) |
4848 | { |
4849 | struct action_data *data; |
4850 | unsigned int i; |
4851 | int ret = 0; |
4852 | |
4853 | for (i = 0; i < hist_data->attrs->n_actions; i++) { |
4854 | data = hist_data->actions[i]; |
4855 | |
4856 | if (data->handler == HANDLER_ONMATCH) { |
4857 | ret = onmatch_create(hist_data, data); |
4858 | if (ret) |
4859 | break; |
4860 | } else if (data->handler == HANDLER_ONMAX || |
4861 | data->handler == HANDLER_ONCHANGE) { |
4862 | ret = track_data_create(hist_data, data); |
4863 | if (ret) |
4864 | break; |
4865 | } else { |
4866 | ret = -EINVAL; |
4867 | break; |
4868 | } |
4869 | } |
4870 | |
4871 | return ret; |
4872 | } |
4873 | |
4874 | static void print_actions(struct seq_file *m, |
4875 | struct hist_trigger_data *hist_data, |
4876 | struct tracing_map_elt *elt) |
4877 | { |
4878 | unsigned int i; |
4879 | |
4880 | for (i = 0; i < hist_data->n_actions; i++) { |
4881 | struct action_data *data = hist_data->actions[i]; |
4882 | |
4883 | if (data->action == ACTION_SNAPSHOT) |
4884 | continue; |
4885 | |
4886 | if (data->handler == HANDLER_ONMAX || |
4887 | data->handler == HANDLER_ONCHANGE) |
4888 | track_data_print(m, hist_data, elt, data); |
4889 | } |
4890 | } |
4891 | |
4892 | static void print_action_spec(struct seq_file *m, |
4893 | struct hist_trigger_data *hist_data, |
4894 | struct action_data *data) |
4895 | { |
4896 | unsigned int i; |
4897 | |
4898 | if (data->action == ACTION_SAVE) { |
4899 | for (i = 0; i < hist_data->n_save_vars; i++) { |
4900 | seq_printf(m, fmt: "%s" , hist_data->save_vars[i]->var->var.name); |
4901 | if (i < hist_data->n_save_vars - 1) |
4902 | seq_puts(m, s: "," ); |
4903 | } |
4904 | } else if (data->action == ACTION_TRACE) { |
4905 | if (data->use_trace_keyword) |
4906 | seq_printf(m, fmt: "%s" , data->synth_event_name); |
4907 | for (i = 0; i < data->n_params; i++) { |
4908 | if (i || data->use_trace_keyword) |
4909 | seq_puts(m, s: "," ); |
4910 | seq_printf(m, fmt: "%s" , data->params[i]); |
4911 | } |
4912 | } |
4913 | } |
4914 | |
4915 | static void print_track_data_spec(struct seq_file *m, |
4916 | struct hist_trigger_data *hist_data, |
4917 | struct action_data *data) |
4918 | { |
4919 | if (data->handler == HANDLER_ONMAX) |
4920 | seq_puts(m, s: ":onmax(" ); |
4921 | else if (data->handler == HANDLER_ONCHANGE) |
4922 | seq_puts(m, s: ":onchange(" ); |
4923 | seq_printf(m, fmt: "%s" , data->track_data.var_str); |
4924 | seq_printf(m, fmt: ").%s(" , data->action_name); |
4925 | |
4926 | print_action_spec(m, hist_data, data); |
4927 | |
4928 | seq_puts(m, s: ")" ); |
4929 | } |
4930 | |
4931 | static void print_onmatch_spec(struct seq_file *m, |
4932 | struct hist_trigger_data *hist_data, |
4933 | struct action_data *data) |
4934 | { |
4935 | seq_printf(m, fmt: ":onmatch(%s.%s)." , data->match_data.event_system, |
4936 | data->match_data.event); |
4937 | |
4938 | seq_printf(m, fmt: "%s(" , data->action_name); |
4939 | |
4940 | print_action_spec(m, hist_data, data); |
4941 | |
4942 | seq_puts(m, s: ")" ); |
4943 | } |
4944 | |
4945 | static bool actions_match(struct hist_trigger_data *hist_data, |
4946 | struct hist_trigger_data *hist_data_test) |
4947 | { |
4948 | unsigned int i, j; |
4949 | |
4950 | if (hist_data->n_actions != hist_data_test->n_actions) |
4951 | return false; |
4952 | |
4953 | for (i = 0; i < hist_data->n_actions; i++) { |
4954 | struct action_data *data = hist_data->actions[i]; |
4955 | struct action_data *data_test = hist_data_test->actions[i]; |
4956 | char *action_name, *action_name_test; |
4957 | |
4958 | if (data->handler != data_test->handler) |
4959 | return false; |
4960 | if (data->action != data_test->action) |
4961 | return false; |
4962 | |
4963 | if (data->n_params != data_test->n_params) |
4964 | return false; |
4965 | |
4966 | for (j = 0; j < data->n_params; j++) { |
4967 | if (strcmp(data->params[j], data_test->params[j]) != 0) |
4968 | return false; |
4969 | } |
4970 | |
4971 | if (data->use_trace_keyword) |
4972 | action_name = data->synth_event_name; |
4973 | else |
4974 | action_name = data->action_name; |
4975 | |
4976 | if (data_test->use_trace_keyword) |
4977 | action_name_test = data_test->synth_event_name; |
4978 | else |
4979 | action_name_test = data_test->action_name; |
4980 | |
4981 | if (strcmp(action_name, action_name_test) != 0) |
4982 | return false; |
4983 | |
4984 | if (data->handler == HANDLER_ONMATCH) { |
4985 | if (strcmp(data->match_data.event_system, |
4986 | data_test->match_data.event_system) != 0) |
4987 | return false; |
4988 | if (strcmp(data->match_data.event, |
4989 | data_test->match_data.event) != 0) |
4990 | return false; |
4991 | } else if (data->handler == HANDLER_ONMAX || |
4992 | data->handler == HANDLER_ONCHANGE) { |
4993 | if (strcmp(data->track_data.var_str, |
4994 | data_test->track_data.var_str) != 0) |
4995 | return false; |
4996 | } |
4997 | } |
4998 | |
4999 | return true; |
5000 | } |
5001 | |
5002 | |
5003 | static void print_actions_spec(struct seq_file *m, |
5004 | struct hist_trigger_data *hist_data) |
5005 | { |
5006 | unsigned int i; |
5007 | |
5008 | for (i = 0; i < hist_data->n_actions; i++) { |
5009 | struct action_data *data = hist_data->actions[i]; |
5010 | |
5011 | if (data->handler == HANDLER_ONMATCH) |
5012 | print_onmatch_spec(m, hist_data, data); |
5013 | else if (data->handler == HANDLER_ONMAX || |
5014 | data->handler == HANDLER_ONCHANGE) |
5015 | print_track_data_spec(m, hist_data, data); |
5016 | } |
5017 | } |
5018 | |
5019 | static void destroy_field_var_hists(struct hist_trigger_data *hist_data) |
5020 | { |
5021 | unsigned int i; |
5022 | |
5023 | for (i = 0; i < hist_data->n_field_var_hists; i++) { |
5024 | kfree(objp: hist_data->field_var_hists[i]->cmd); |
5025 | kfree(objp: hist_data->field_var_hists[i]); |
5026 | } |
5027 | } |
5028 | |
5029 | static void destroy_hist_data(struct hist_trigger_data *hist_data) |
5030 | { |
5031 | if (!hist_data) |
5032 | return; |
5033 | |
5034 | destroy_hist_trigger_attrs(attrs: hist_data->attrs); |
5035 | destroy_hist_fields(hist_data); |
5036 | tracing_map_destroy(map: hist_data->map); |
5037 | |
5038 | destroy_actions(hist_data); |
5039 | destroy_field_vars(hist_data); |
5040 | destroy_field_var_hists(hist_data); |
5041 | |
5042 | kfree(objp: hist_data); |
5043 | } |
5044 | |
5045 | static int create_tracing_map_fields(struct hist_trigger_data *hist_data) |
5046 | { |
5047 | struct tracing_map *map = hist_data->map; |
5048 | struct ftrace_event_field *field; |
5049 | struct hist_field *hist_field; |
5050 | int i, idx = 0; |
5051 | |
5052 | for_each_hist_field(i, hist_data) { |
5053 | hist_field = hist_data->fields[i]; |
5054 | if (hist_field->flags & HIST_FIELD_FL_KEY) { |
5055 | tracing_map_cmp_fn_t cmp_fn; |
5056 | |
5057 | field = hist_field->field; |
5058 | |
5059 | if (hist_field->flags & HIST_FIELD_FL_STACKTRACE) |
5060 | cmp_fn = tracing_map_cmp_none; |
5061 | else if (!field || hist_field->flags & HIST_FIELD_FL_CPU) |
5062 | cmp_fn = tracing_map_cmp_num(field_size: hist_field->size, |
5063 | field_is_signed: hist_field->is_signed); |
5064 | else if (is_string_field(field)) |
5065 | cmp_fn = tracing_map_cmp_string; |
5066 | else |
5067 | cmp_fn = tracing_map_cmp_num(field_size: field->size, |
5068 | field_is_signed: field->is_signed); |
5069 | idx = tracing_map_add_key_field(map, |
5070 | offset: hist_field->offset, |
5071 | cmp_fn); |
5072 | } else if (!(hist_field->flags & HIST_FIELD_FL_VAR)) |
5073 | idx = tracing_map_add_sum_field(map); |
5074 | |
5075 | if (idx < 0) |
5076 | return idx; |
5077 | |
5078 | if (hist_field->flags & HIST_FIELD_FL_VAR) { |
5079 | idx = tracing_map_add_var(map); |
5080 | if (idx < 0) |
5081 | return idx; |
5082 | hist_field->var.idx = idx; |
5083 | hist_field->var.hist_data = hist_data; |
5084 | } |
5085 | } |
5086 | |
5087 | return 0; |
5088 | } |
5089 | |
5090 | static struct hist_trigger_data * |
5091 | create_hist_data(unsigned int map_bits, |
5092 | struct hist_trigger_attrs *attrs, |
5093 | struct trace_event_file *file, |
5094 | bool remove) |
5095 | { |
5096 | const struct tracing_map_ops *map_ops = NULL; |
5097 | struct hist_trigger_data *hist_data; |
5098 | int ret = 0; |
5099 | |
5100 | hist_data = kzalloc(size: sizeof(*hist_data), GFP_KERNEL); |
5101 | if (!hist_data) |
5102 | return ERR_PTR(error: -ENOMEM); |
5103 | |
5104 | hist_data->attrs = attrs; |
5105 | hist_data->remove = remove; |
5106 | hist_data->event_file = file; |
5107 | |
5108 | ret = parse_actions(hist_data); |
5109 | if (ret) |
5110 | goto free; |
5111 | |
5112 | ret = create_hist_fields(hist_data, file); |
5113 | if (ret) |
5114 | goto free; |
5115 | |
5116 | ret = create_sort_keys(hist_data); |
5117 | if (ret) |
5118 | goto free; |
5119 | |
5120 | map_ops = &hist_trigger_elt_data_ops; |
5121 | |
5122 | hist_data->map = tracing_map_create(map_bits, key_size: hist_data->key_size, |
5123 | ops: map_ops, private_data: hist_data); |
5124 | if (IS_ERR(ptr: hist_data->map)) { |
5125 | ret = PTR_ERR(ptr: hist_data->map); |
5126 | hist_data->map = NULL; |
5127 | goto free; |
5128 | } |
5129 | |
5130 | ret = create_tracing_map_fields(hist_data); |
5131 | if (ret) |
5132 | goto free; |
5133 | out: |
5134 | return hist_data; |
5135 | free: |
5136 | hist_data->attrs = NULL; |
5137 | |
5138 | destroy_hist_data(hist_data); |
5139 | |
5140 | hist_data = ERR_PTR(error: ret); |
5141 | |
5142 | goto out; |
5143 | } |
5144 | |
5145 | static void hist_trigger_elt_update(struct hist_trigger_data *hist_data, |
5146 | struct tracing_map_elt *elt, |
5147 | struct trace_buffer *buffer, void *rec, |
5148 | struct ring_buffer_event *rbe, |
5149 | u64 *var_ref_vals) |
5150 | { |
5151 | struct hist_elt_data *elt_data; |
5152 | struct hist_field *hist_field; |
5153 | unsigned int i, var_idx; |
5154 | u64 hist_val; |
5155 | |
5156 | elt_data = elt->private_data; |
5157 | elt_data->var_ref_vals = var_ref_vals; |
5158 | |
5159 | for_each_hist_val_field(i, hist_data) { |
5160 | hist_field = hist_data->fields[i]; |
5161 | hist_val = hist_fn_call(hist_field, elt, buffer, rbe, event: rec); |
5162 | if (hist_field->flags & HIST_FIELD_FL_VAR) { |
5163 | var_idx = hist_field->var.idx; |
5164 | |
5165 | if (hist_field->flags & |
5166 | (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE)) { |
5167 | unsigned int str_start, var_str_idx, idx; |
5168 | char *str, *val_str; |
5169 | unsigned int size; |
5170 | |
5171 | str_start = hist_data->n_field_var_str + |
5172 | hist_data->n_save_var_str; |
5173 | var_str_idx = hist_field->var_str_idx; |
5174 | idx = str_start + var_str_idx; |
5175 | |
5176 | str = elt_data->field_var_str[idx]; |
5177 | val_str = (char *)(uintptr_t)hist_val; |
5178 | |
5179 | if (hist_field->flags & HIST_FIELD_FL_STRING) { |
5180 | size = min(hist_field->size, STR_VAR_LEN_MAX); |
5181 | strscpy(p: str, q: val_str, size); |
5182 | } else { |
5183 | char *stack_start = str + sizeof(unsigned long); |
5184 | int e; |
5185 | |
5186 | e = stack_trace_save(store: (void *)stack_start, |
5187 | HIST_STACKTRACE_DEPTH, |
5188 | HIST_STACKTRACE_SKIP); |
5189 | if (e < HIST_STACKTRACE_DEPTH - 1) |
5190 | ((unsigned long *)stack_start)[e] = 0; |
5191 | *((unsigned long *)str) = e; |
5192 | } |
5193 | hist_val = (u64)(uintptr_t)str; |
5194 | } |
5195 | tracing_map_set_var(elt, i: var_idx, n: hist_val); |
5196 | continue; |
5197 | } |
5198 | tracing_map_update_sum(elt, i, n: hist_val); |
5199 | } |
5200 | |
5201 | for_each_hist_key_field(i, hist_data) { |
5202 | hist_field = hist_data->fields[i]; |
5203 | if (hist_field->flags & HIST_FIELD_FL_VAR) { |
5204 | hist_val = hist_fn_call(hist_field, elt, buffer, rbe, event: rec); |
5205 | var_idx = hist_field->var.idx; |
5206 | tracing_map_set_var(elt, i: var_idx, n: hist_val); |
5207 | } |
5208 | } |
5209 | |
5210 | update_field_vars(hist_data, elt, buffer, rbe, rec); |
5211 | } |
5212 | |
5213 | static inline void add_to_key(char *compound_key, void *key, |
5214 | struct hist_field *key_field, void *rec) |
5215 | { |
5216 | size_t size = key_field->size; |
5217 | |
5218 | if (key_field->flags & HIST_FIELD_FL_STRING) { |
5219 | struct ftrace_event_field *field; |
5220 | |
5221 | field = key_field->field; |
5222 | if (field->filter_type == FILTER_DYN_STRING || |
5223 | field->filter_type == FILTER_RDYN_STRING) |
5224 | size = *(u32 *)(rec + field->offset) >> 16; |
5225 | else if (field->filter_type == FILTER_STATIC_STRING) |
5226 | size = field->size; |
5227 | |
5228 | /* ensure NULL-termination */ |
5229 | if (size > key_field->size - 1) |
5230 | size = key_field->size - 1; |
5231 | |
5232 | strncpy(p: compound_key + key_field->offset, q: (char *)key, size); |
5233 | } else |
5234 | memcpy(compound_key + key_field->offset, key, size); |
5235 | } |
5236 | |
5237 | static void |
5238 | hist_trigger_actions(struct hist_trigger_data *hist_data, |
5239 | struct tracing_map_elt *elt, |
5240 | struct trace_buffer *buffer, void *rec, |
5241 | struct ring_buffer_event *rbe, void *key, |
5242 | u64 *var_ref_vals) |
5243 | { |
5244 | struct action_data *data; |
5245 | unsigned int i; |
5246 | |
5247 | for (i = 0; i < hist_data->n_actions; i++) { |
5248 | data = hist_data->actions[i]; |
5249 | data->fn(hist_data, elt, buffer, rec, rbe, key, data, var_ref_vals); |
5250 | } |
5251 | } |
5252 | |
5253 | static void event_hist_trigger(struct event_trigger_data *data, |
5254 | struct trace_buffer *buffer, void *rec, |
5255 | struct ring_buffer_event *rbe) |
5256 | { |
5257 | struct hist_trigger_data *hist_data = data->private_data; |
5258 | bool use_compound_key = (hist_data->n_keys > 1); |
5259 | unsigned long entries[HIST_STACKTRACE_DEPTH]; |
5260 | u64 var_ref_vals[TRACING_MAP_VARS_MAX]; |
5261 | char compound_key[HIST_KEY_SIZE_MAX]; |
5262 | struct tracing_map_elt *elt = NULL; |
5263 | struct hist_field *key_field; |
5264 | u64 field_contents; |
5265 | void *key = NULL; |
5266 | unsigned int i; |
5267 | |
5268 | if (unlikely(!rbe)) |
5269 | return; |
5270 | |
5271 | memset(compound_key, 0, hist_data->key_size); |
5272 | |
5273 | for_each_hist_key_field(i, hist_data) { |
5274 | key_field = hist_data->fields[i]; |
5275 | |
5276 | if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { |
5277 | memset(entries, 0, HIST_STACKTRACE_SIZE); |
5278 | if (key_field->field) { |
5279 | unsigned long *stack, n_entries; |
5280 | |
5281 | field_contents = hist_fn_call(hist_field: key_field, elt, buffer, rbe, event: rec); |
5282 | stack = (unsigned long *)(long)field_contents; |
5283 | n_entries = *stack; |
5284 | memcpy(entries, ++stack, n_entries * sizeof(unsigned long)); |
5285 | } else { |
5286 | stack_trace_save(store: entries, HIST_STACKTRACE_DEPTH, |
5287 | HIST_STACKTRACE_SKIP); |
5288 | } |
5289 | key = entries; |
5290 | } else { |
5291 | field_contents = hist_fn_call(hist_field: key_field, elt, buffer, rbe, event: rec); |
5292 | if (key_field->flags & HIST_FIELD_FL_STRING) { |
5293 | key = (void *)(unsigned long)field_contents; |
5294 | use_compound_key = true; |
5295 | } else |
5296 | key = (void *)&field_contents; |
5297 | } |
5298 | |
5299 | if (use_compound_key) |
5300 | add_to_key(compound_key, key, key_field, rec); |
5301 | } |
5302 | |
5303 | if (use_compound_key) |
5304 | key = compound_key; |
5305 | |
5306 | if (hist_data->n_var_refs && |
5307 | !resolve_var_refs(hist_data, key, var_ref_vals, self: false)) |
5308 | return; |
5309 | |
5310 | elt = tracing_map_insert(map: hist_data->map, key); |
5311 | if (!elt) |
5312 | return; |
5313 | |
5314 | hist_trigger_elt_update(hist_data, elt, buffer, rec, rbe, var_ref_vals); |
5315 | |
5316 | if (resolve_var_refs(hist_data, key, var_ref_vals, self: true)) |
5317 | hist_trigger_actions(hist_data, elt, buffer, rec, rbe, key, var_ref_vals); |
5318 | } |
5319 | |
5320 | static void hist_trigger_stacktrace_print(struct seq_file *m, |
5321 | unsigned long *stacktrace_entries, |
5322 | unsigned int max_entries) |
5323 | { |
5324 | unsigned int spaces = 8; |
5325 | unsigned int i; |
5326 | |
5327 | for (i = 0; i < max_entries; i++) { |
5328 | if (!stacktrace_entries[i]) |
5329 | return; |
5330 | |
5331 | seq_printf(m, fmt: "%*c" , 1 + spaces, ' '); |
5332 | seq_printf(m, fmt: "%pS\n" , (void*)stacktrace_entries[i]); |
5333 | } |
5334 | } |
5335 | |
5336 | static void hist_trigger_print_key(struct seq_file *m, |
5337 | struct hist_trigger_data *hist_data, |
5338 | void *key, |
5339 | struct tracing_map_elt *elt) |
5340 | { |
5341 | struct hist_field *key_field; |
5342 | bool multiline = false; |
5343 | const char *field_name; |
5344 | unsigned int i; |
5345 | u64 uval; |
5346 | |
5347 | seq_puts(m, s: "{ " ); |
5348 | |
5349 | for_each_hist_key_field(i, hist_data) { |
5350 | key_field = hist_data->fields[i]; |
5351 | |
5352 | if (i > hist_data->n_vals) |
5353 | seq_puts(m, s: ", " ); |
5354 | |
5355 | field_name = hist_field_name(field: key_field, level: 0); |
5356 | |
5357 | if (key_field->flags & HIST_FIELD_FL_HEX) { |
5358 | uval = *(u64 *)(key + key_field->offset); |
5359 | seq_printf(m, fmt: "%s: %llx" , field_name, uval); |
5360 | } else if (key_field->flags & HIST_FIELD_FL_SYM) { |
5361 | uval = *(u64 *)(key + key_field->offset); |
5362 | seq_printf(m, fmt: "%s: [%llx] %-45ps" , field_name, |
5363 | uval, (void *)(uintptr_t)uval); |
5364 | } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) { |
5365 | uval = *(u64 *)(key + key_field->offset); |
5366 | seq_printf(m, fmt: "%s: [%llx] %-55pS" , field_name, |
5367 | uval, (void *)(uintptr_t)uval); |
5368 | } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) { |
5369 | struct hist_elt_data *elt_data = elt->private_data; |
5370 | char *comm; |
5371 | |
5372 | if (WARN_ON_ONCE(!elt_data)) |
5373 | return; |
5374 | |
5375 | comm = elt_data->comm; |
5376 | |
5377 | uval = *(u64 *)(key + key_field->offset); |
5378 | seq_printf(m, fmt: "%s: %-16s[%10llu]" , field_name, |
5379 | comm, uval); |
5380 | } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) { |
5381 | const char *syscall_name; |
5382 | |
5383 | uval = *(u64 *)(key + key_field->offset); |
5384 | syscall_name = get_syscall_name(syscall: uval); |
5385 | if (!syscall_name) |
5386 | syscall_name = "unknown_syscall" ; |
5387 | |
5388 | seq_printf(m, fmt: "%s: %-30s[%3llu]" , field_name, |
5389 | syscall_name, uval); |
5390 | } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { |
5391 | if (key_field->field) |
5392 | seq_printf(m, fmt: "%s.stacktrace" , key_field->field->name); |
5393 | else |
5394 | seq_puts(m, s: "common_stacktrace:\n" ); |
5395 | hist_trigger_stacktrace_print(m, |
5396 | stacktrace_entries: key + key_field->offset, |
5397 | HIST_STACKTRACE_DEPTH); |
5398 | multiline = true; |
5399 | } else if (key_field->flags & HIST_FIELD_FL_LOG2) { |
5400 | seq_printf(m, fmt: "%s: ~ 2^%-2llu" , field_name, |
5401 | *(u64 *)(key + key_field->offset)); |
5402 | } else if (key_field->flags & HIST_FIELD_FL_BUCKET) { |
5403 | unsigned long buckets = key_field->buckets; |
5404 | uval = *(u64 *)(key + key_field->offset); |
5405 | seq_printf(m, fmt: "%s: ~ %llu-%llu" , field_name, |
5406 | uval, uval + buckets -1); |
5407 | } else if (key_field->flags & HIST_FIELD_FL_STRING) { |
5408 | seq_printf(m, fmt: "%s: %-50s" , field_name, |
5409 | (char *)(key + key_field->offset)); |
5410 | } else { |
5411 | uval = *(u64 *)(key + key_field->offset); |
5412 | seq_printf(m, fmt: "%s: %10llu" , field_name, uval); |
5413 | } |
5414 | } |
5415 | |
5416 | if (!multiline) |
5417 | seq_puts(m, s: " " ); |
5418 | |
5419 | seq_puts(m, s: "}" ); |
5420 | } |
5421 | |
5422 | /* Get the 100 times of the percentage of @val in @total */ |
5423 | static inline unsigned int __get_percentage(u64 val, u64 total) |
5424 | { |
5425 | if (!total) |
5426 | goto div0; |
5427 | |
5428 | if (val < (U64_MAX / 10000)) |
5429 | return (unsigned int)div64_ul(val * 10000, total); |
5430 | |
5431 | total = div64_u64(dividend: total, divisor: 10000); |
5432 | if (!total) |
5433 | goto div0; |
5434 | |
5435 | return (unsigned int)div64_ul(val, total); |
5436 | div0: |
5437 | return val ? UINT_MAX : 0; |
5438 | } |
5439 | |
5440 | #define BAR_CHAR '#' |
5441 | |
5442 | static inline const char *__fill_bar_str(char *buf, int size, u64 val, u64 max) |
5443 | { |
5444 | unsigned int len = __get_percentage(val, total: max); |
5445 | int i; |
5446 | |
5447 | if (len == UINT_MAX) { |
5448 | snprintf(buf, size, fmt: "[ERROR]" ); |
5449 | return buf; |
5450 | } |
5451 | |
5452 | len = len * size / 10000; |
5453 | for (i = 0; i < len && i < size; i++) |
5454 | buf[i] = BAR_CHAR; |
5455 | while (i < size) |
5456 | buf[i++] = ' '; |
5457 | buf[size] = '\0'; |
5458 | |
5459 | return buf; |
5460 | } |
5461 | |
5462 | struct hist_val_stat { |
5463 | u64 max; |
5464 | u64 total; |
5465 | }; |
5466 | |
5467 | static void hist_trigger_print_val(struct seq_file *m, unsigned int idx, |
5468 | const char *field_name, unsigned long flags, |
5469 | struct hist_val_stat *stats, |
5470 | struct tracing_map_elt *elt) |
5471 | { |
5472 | u64 val = tracing_map_read_sum(elt, i: idx); |
5473 | unsigned int pc; |
5474 | char bar[21]; |
5475 | |
5476 | if (flags & HIST_FIELD_FL_PERCENT) { |
5477 | pc = __get_percentage(val, total: stats[idx].total); |
5478 | if (pc == UINT_MAX) |
5479 | seq_printf(m, fmt: " %s (%%):[ERROR]" , field_name); |
5480 | else |
5481 | seq_printf(m, fmt: " %s (%%): %3u.%02u" , field_name, |
5482 | pc / 100, pc % 100); |
5483 | } else if (flags & HIST_FIELD_FL_GRAPH) { |
5484 | seq_printf(m, fmt: " %s: %20s" , field_name, |
5485 | __fill_bar_str(buf: bar, size: 20, val, max: stats[idx].max)); |
5486 | } else if (flags & HIST_FIELD_FL_HEX) { |
5487 | seq_printf(m, fmt: " %s: %10llx" , field_name, val); |
5488 | } else { |
5489 | seq_printf(m, fmt: " %s: %10llu" , field_name, val); |
5490 | } |
5491 | } |
5492 | |
5493 | static void hist_trigger_entry_print(struct seq_file *m, |
5494 | struct hist_trigger_data *hist_data, |
5495 | struct hist_val_stat *stats, |
5496 | void *key, |
5497 | struct tracing_map_elt *elt) |
5498 | { |
5499 | const char *field_name; |
5500 | unsigned int i = HITCOUNT_IDX; |
5501 | unsigned long flags; |
5502 | |
5503 | hist_trigger_print_key(m, hist_data, key, elt); |
5504 | |
5505 | /* At first, show the raw hitcount if !nohitcount */ |
5506 | if (!hist_data->attrs->no_hitcount) |
5507 | hist_trigger_print_val(m, idx: i, field_name: "hitcount" , flags: 0, stats, elt); |
5508 | |
5509 | for (i = 1; i < hist_data->n_vals; i++) { |
5510 | field_name = hist_field_name(field: hist_data->fields[i], level: 0); |
5511 | flags = hist_data->fields[i]->flags; |
5512 | if (flags & HIST_FIELD_FL_VAR || flags & HIST_FIELD_FL_EXPR) |
5513 | continue; |
5514 | |
5515 | seq_puts(m, s: " " ); |
5516 | hist_trigger_print_val(m, idx: i, field_name, flags, stats, elt); |
5517 | } |
5518 | |
5519 | print_actions(m, hist_data, elt); |
5520 | |
5521 | seq_puts(m, s: "\n" ); |
5522 | } |
5523 | |
5524 | static int print_entries(struct seq_file *m, |
5525 | struct hist_trigger_data *hist_data) |
5526 | { |
5527 | struct tracing_map_sort_entry **sort_entries = NULL; |
5528 | struct tracing_map *map = hist_data->map; |
5529 | int i, j, n_entries; |
5530 | struct hist_val_stat *stats = NULL; |
5531 | u64 val; |
5532 | |
5533 | n_entries = tracing_map_sort_entries(map, sort_keys: hist_data->sort_keys, |
5534 | n_sort_keys: hist_data->n_sort_keys, |
5535 | sort_entries: &sort_entries); |
5536 | if (n_entries < 0) |
5537 | return n_entries; |
5538 | |
5539 | /* Calculate the max and the total for each field if needed. */ |
5540 | for (j = 0; j < hist_data->n_vals; j++) { |
5541 | if (!(hist_data->fields[j]->flags & |
5542 | (HIST_FIELD_FL_PERCENT | HIST_FIELD_FL_GRAPH))) |
5543 | continue; |
5544 | if (!stats) { |
5545 | stats = kcalloc(n: hist_data->n_vals, size: sizeof(*stats), |
5546 | GFP_KERNEL); |
5547 | if (!stats) { |
5548 | n_entries = -ENOMEM; |
5549 | goto out; |
5550 | } |
5551 | } |
5552 | for (i = 0; i < n_entries; i++) { |
5553 | val = tracing_map_read_sum(elt: sort_entries[i]->elt, i: j); |
5554 | stats[j].total += val; |
5555 | if (stats[j].max < val) |
5556 | stats[j].max = val; |
5557 | } |
5558 | } |
5559 | |
5560 | for (i = 0; i < n_entries; i++) |
5561 | hist_trigger_entry_print(m, hist_data, stats, |
5562 | key: sort_entries[i]->key, |
5563 | elt: sort_entries[i]->elt); |
5564 | |
5565 | kfree(objp: stats); |
5566 | out: |
5567 | tracing_map_destroy_sort_entries(entries: sort_entries, n_entries); |
5568 | |
5569 | return n_entries; |
5570 | } |
5571 | |
5572 | static void hist_trigger_show(struct seq_file *m, |
5573 | struct event_trigger_data *data, int n) |
5574 | { |
5575 | struct hist_trigger_data *hist_data; |
5576 | int n_entries; |
5577 | |
5578 | if (n > 0) |
5579 | seq_puts(m, s: "\n\n" ); |
5580 | |
5581 | seq_puts(m, s: "# event histogram\n#\n# trigger info: " ); |
5582 | data->ops->print(m, data); |
5583 | seq_puts(m, s: "#\n\n" ); |
5584 | |
5585 | hist_data = data->private_data; |
5586 | n_entries = print_entries(m, hist_data); |
5587 | if (n_entries < 0) |
5588 | n_entries = 0; |
5589 | |
5590 | track_data_snapshot_print(m, hist_data); |
5591 | |
5592 | seq_printf(m, fmt: "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n" , |
5593 | (u64)atomic64_read(v: &hist_data->map->hits), |
5594 | n_entries, (u64)atomic64_read(v: &hist_data->map->drops)); |
5595 | } |
5596 | |
5597 | static int hist_show(struct seq_file *m, void *v) |
5598 | { |
5599 | struct event_trigger_data *data; |
5600 | struct trace_event_file *event_file; |
5601 | int n = 0, ret = 0; |
5602 | |
5603 | mutex_lock(&event_mutex); |
5604 | |
5605 | event_file = event_file_data(filp: m->private); |
5606 | if (unlikely(!event_file)) { |
5607 | ret = -ENODEV; |
5608 | goto out_unlock; |
5609 | } |
5610 | |
5611 | list_for_each_entry(data, &event_file->triggers, list) { |
5612 | if (data->cmd_ops->trigger_type == ETT_EVENT_HIST) |
5613 | hist_trigger_show(m, data, n: n++); |
5614 | } |
5615 | |
5616 | out_unlock: |
5617 | mutex_unlock(lock: &event_mutex); |
5618 | |
5619 | return ret; |
5620 | } |
5621 | |
5622 | static int event_hist_open(struct inode *inode, struct file *file) |
5623 | { |
5624 | int ret; |
5625 | |
5626 | ret = security_locked_down(what: LOCKDOWN_TRACEFS); |
5627 | if (ret) |
5628 | return ret; |
5629 | |
5630 | return single_open(file, hist_show, file); |
5631 | } |
5632 | |
5633 | const struct file_operations event_hist_fops = { |
5634 | .open = event_hist_open, |
5635 | .read = seq_read, |
5636 | .llseek = seq_lseek, |
5637 | .release = single_release, |
5638 | }; |
5639 | |
5640 | #ifdef CONFIG_HIST_TRIGGERS_DEBUG |
5641 | static void hist_field_debug_show_flags(struct seq_file *m, |
5642 | unsigned long flags) |
5643 | { |
5644 | seq_puts(m, s: " flags:\n" ); |
5645 | |
5646 | if (flags & HIST_FIELD_FL_KEY) |
5647 | seq_puts(m, s: " HIST_FIELD_FL_KEY\n" ); |
5648 | else if (flags & HIST_FIELD_FL_HITCOUNT) |
5649 | seq_puts(m, s: " VAL: HIST_FIELD_FL_HITCOUNT\n" ); |
5650 | else if (flags & HIST_FIELD_FL_VAR) |
5651 | seq_puts(m, s: " HIST_FIELD_FL_VAR\n" ); |
5652 | else if (flags & HIST_FIELD_FL_VAR_REF) |
5653 | seq_puts(m, s: " HIST_FIELD_FL_VAR_REF\n" ); |
5654 | else |
5655 | seq_puts(m, s: " VAL: normal u64 value\n" ); |
5656 | |
5657 | if (flags & HIST_FIELD_FL_ALIAS) |
5658 | seq_puts(m, s: " HIST_FIELD_FL_ALIAS\n" ); |
5659 | else if (flags & HIST_FIELD_FL_CONST) |
5660 | seq_puts(m, s: " HIST_FIELD_FL_CONST\n" ); |
5661 | } |
5662 | |
5663 | static int hist_field_debug_show(struct seq_file *m, |
5664 | struct hist_field *field, unsigned long flags) |
5665 | { |
5666 | if ((field->flags & flags) != flags) { |
5667 | seq_printf(m, fmt: "ERROR: bad flags - %lx\n" , flags); |
5668 | return -EINVAL; |
5669 | } |
5670 | |
5671 | hist_field_debug_show_flags(m, flags: field->flags); |
5672 | if (field->field) |
5673 | seq_printf(m, fmt: " ftrace_event_field name: %s\n" , |
5674 | field->field->name); |
5675 | |
5676 | if (field->flags & HIST_FIELD_FL_VAR) { |
5677 | seq_printf(m, fmt: " var.name: %s\n" , field->var.name); |
5678 | seq_printf(m, fmt: " var.idx (into tracing_map_elt.vars[]): %u\n" , |
5679 | field->var.idx); |
5680 | } |
5681 | |
5682 | if (field->flags & HIST_FIELD_FL_CONST) |
5683 | seq_printf(m, fmt: " constant: %llu\n" , field->constant); |
5684 | |
5685 | if (field->flags & HIST_FIELD_FL_ALIAS) |
5686 | seq_printf(m, fmt: " var_ref_idx (into hist_data->var_refs[]): %u\n" , |
5687 | field->var_ref_idx); |
5688 | |
5689 | if (field->flags & HIST_FIELD_FL_VAR_REF) { |
5690 | seq_printf(m, fmt: " name: %s\n" , field->name); |
5691 | seq_printf(m, fmt: " var.idx (into tracing_map_elt.vars[]): %u\n" , |
5692 | field->var.idx); |
5693 | seq_printf(m, fmt: " var.hist_data: %p\n" , field->var.hist_data); |
5694 | seq_printf(m, fmt: " var_ref_idx (into hist_data->var_refs[]): %u\n" , |
5695 | field->var_ref_idx); |
5696 | if (field->system) |
5697 | seq_printf(m, fmt: " system: %s\n" , field->system); |
5698 | if (field->event_name) |
5699 | seq_printf(m, fmt: " event_name: %s\n" , field->event_name); |
5700 | } |
5701 | |
5702 | seq_printf(m, fmt: " type: %s\n" , field->type); |
5703 | seq_printf(m, fmt: " size: %u\n" , field->size); |
5704 | seq_printf(m, fmt: " is_signed: %u\n" , field->is_signed); |
5705 | |
5706 | return 0; |
5707 | } |
5708 | |
5709 | static int field_var_debug_show(struct seq_file *m, |
5710 | struct field_var *field_var, unsigned int i, |
5711 | bool save_vars) |
5712 | { |
5713 | const char *vars_name = save_vars ? "save_vars" : "field_vars" ; |
5714 | struct hist_field *field; |
5715 | int ret = 0; |
5716 | |
5717 | seq_printf(m, fmt: "\n hist_data->%s[%d]:\n" , vars_name, i); |
5718 | |
5719 | field = field_var->var; |
5720 | |
5721 | seq_printf(m, fmt: "\n %s[%d].var:\n" , vars_name, i); |
5722 | |
5723 | hist_field_debug_show_flags(m, flags: field->flags); |
5724 | seq_printf(m, fmt: " var.name: %s\n" , field->var.name); |
5725 | seq_printf(m, fmt: " var.idx (into tracing_map_elt.vars[]): %u\n" , |
5726 | field->var.idx); |
5727 | |
5728 | field = field_var->val; |
5729 | |
5730 | seq_printf(m, fmt: "\n %s[%d].val:\n" , vars_name, i); |
5731 | if (field->field) |
5732 | seq_printf(m, fmt: " ftrace_event_field name: %s\n" , |
5733 | field->field->name); |
5734 | else { |
5735 | ret = -EINVAL; |
5736 | goto out; |
5737 | } |
5738 | |
5739 | seq_printf(m, fmt: " type: %s\n" , field->type); |
5740 | seq_printf(m, fmt: " size: %u\n" , field->size); |
5741 | seq_printf(m, fmt: " is_signed: %u\n" , field->is_signed); |
5742 | out: |
5743 | return ret; |
5744 | } |
5745 | |
5746 | static int hist_action_debug_show(struct seq_file *m, |
5747 | struct action_data *data, int i) |
5748 | { |
5749 | int ret = 0; |
5750 | |
5751 | if (data->handler == HANDLER_ONMAX || |
5752 | data->handler == HANDLER_ONCHANGE) { |
5753 | seq_printf(m, fmt: "\n hist_data->actions[%d].track_data.var_ref:\n" , i); |
5754 | ret = hist_field_debug_show(m, field: data->track_data.var_ref, |
5755 | flags: HIST_FIELD_FL_VAR_REF); |
5756 | if (ret) |
5757 | goto out; |
5758 | |
5759 | seq_printf(m, fmt: "\n hist_data->actions[%d].track_data.track_var:\n" , i); |
5760 | ret = hist_field_debug_show(m, field: data->track_data.track_var, |
5761 | flags: HIST_FIELD_FL_VAR); |
5762 | if (ret) |
5763 | goto out; |
5764 | } |
5765 | |
5766 | if (data->handler == HANDLER_ONMATCH) { |
5767 | seq_printf(m, fmt: "\n hist_data->actions[%d].match_data.event_system: %s\n" , |
5768 | i, data->match_data.event_system); |
5769 | seq_printf(m, fmt: " hist_data->actions[%d].match_data.event: %s\n" , |
5770 | i, data->match_data.event); |
5771 | } |
5772 | out: |
5773 | return ret; |
5774 | } |
5775 | |
5776 | static int hist_actions_debug_show(struct seq_file *m, |
5777 | struct hist_trigger_data *hist_data) |
5778 | { |
5779 | int i, ret = 0; |
5780 | |
5781 | if (hist_data->n_actions) |
5782 | seq_puts(m, s: "\n action tracking variables (for onmax()/onchange()/onmatch()):\n" ); |
5783 | |
5784 | for (i = 0; i < hist_data->n_actions; i++) { |
5785 | struct action_data *action = hist_data->actions[i]; |
5786 | |
5787 | ret = hist_action_debug_show(m, data: action, i); |
5788 | if (ret) |
5789 | goto out; |
5790 | } |
5791 | |
5792 | if (hist_data->n_save_vars) |
5793 | seq_puts(m, s: "\n save action variables (save() params):\n" ); |
5794 | |
5795 | for (i = 0; i < hist_data->n_save_vars; i++) { |
5796 | ret = field_var_debug_show(m, field_var: hist_data->save_vars[i], i, save_vars: true); |
5797 | if (ret) |
5798 | goto out; |
5799 | } |
5800 | out: |
5801 | return ret; |
5802 | } |
5803 | |
5804 | static void hist_trigger_debug_show(struct seq_file *m, |
5805 | struct event_trigger_data *data, int n) |
5806 | { |
5807 | struct hist_trigger_data *hist_data; |
5808 | int i, ret; |
5809 | |
5810 | if (n > 0) |
5811 | seq_puts(m, s: "\n\n" ); |
5812 | |
5813 | seq_puts(m, s: "# event histogram\n#\n# trigger info: " ); |
5814 | data->ops->print(m, data); |
5815 | seq_puts(m, s: "#\n\n" ); |
5816 | |
5817 | hist_data = data->private_data; |
5818 | |
5819 | seq_printf(m, fmt: "hist_data: %p\n\n" , hist_data); |
5820 | seq_printf(m, fmt: " n_vals: %u\n" , hist_data->n_vals); |
5821 | seq_printf(m, fmt: " n_keys: %u\n" , hist_data->n_keys); |
5822 | seq_printf(m, fmt: " n_fields: %u\n" , hist_data->n_fields); |
5823 | |
5824 | seq_puts(m, s: "\n val fields:\n\n" ); |
5825 | |
5826 | seq_puts(m, s: " hist_data->fields[0]:\n" ); |
5827 | ret = hist_field_debug_show(m, field: hist_data->fields[0], |
5828 | flags: HIST_FIELD_FL_HITCOUNT); |
5829 | if (ret) |
5830 | return; |
5831 | |
5832 | for (i = 1; i < hist_data->n_vals; i++) { |
5833 | seq_printf(m, fmt: "\n hist_data->fields[%d]:\n" , i); |
5834 | ret = hist_field_debug_show(m, field: hist_data->fields[i], flags: 0); |
5835 | if (ret) |
5836 | return; |
5837 | } |
5838 | |
5839 | seq_puts(m, s: "\n key fields:\n" ); |
5840 | |
5841 | for (i = hist_data->n_vals; i < hist_data->n_fields; i++) { |
5842 | seq_printf(m, fmt: "\n hist_data->fields[%d]:\n" , i); |
5843 | ret = hist_field_debug_show(m, field: hist_data->fields[i], |
5844 | flags: HIST_FIELD_FL_KEY); |
5845 | if (ret) |
5846 | return; |
5847 | } |
5848 | |
5849 | if (hist_data->n_var_refs) |
5850 | seq_puts(m, s: "\n variable reference fields:\n" ); |
5851 | |
5852 | for (i = 0; i < hist_data->n_var_refs; i++) { |
5853 | seq_printf(m, fmt: "\n hist_data->var_refs[%d]:\n" , i); |
5854 | ret = hist_field_debug_show(m, field: hist_data->var_refs[i], |
5855 | flags: HIST_FIELD_FL_VAR_REF); |
5856 | if (ret) |
5857 | return; |
5858 | } |
5859 | |
5860 | if (hist_data->n_field_vars) |
5861 | seq_puts(m, s: "\n field variables:\n" ); |
5862 | |
5863 | for (i = 0; i < hist_data->n_field_vars; i++) { |
5864 | ret = field_var_debug_show(m, field_var: hist_data->field_vars[i], i, save_vars: false); |
5865 | if (ret) |
5866 | return; |
5867 | } |
5868 | |
5869 | ret = hist_actions_debug_show(m, hist_data); |
5870 | if (ret) |
5871 | return; |
5872 | } |
5873 | |
5874 | static int hist_debug_show(struct seq_file *m, void *v) |
5875 | { |
5876 | struct event_trigger_data *data; |
5877 | struct trace_event_file *event_file; |
5878 | int n = 0, ret = 0; |
5879 | |
5880 | mutex_lock(&event_mutex); |
5881 | |
5882 | event_file = event_file_data(filp: m->private); |
5883 | if (unlikely(!event_file)) { |
5884 | ret = -ENODEV; |
5885 | goto out_unlock; |
5886 | } |
5887 | |
5888 | list_for_each_entry(data, &event_file->triggers, list) { |
5889 | if (data->cmd_ops->trigger_type == ETT_EVENT_HIST) |
5890 | hist_trigger_debug_show(m, data, n: n++); |
5891 | } |
5892 | |
5893 | out_unlock: |
5894 | mutex_unlock(lock: &event_mutex); |
5895 | |
5896 | return ret; |
5897 | } |
5898 | |
5899 | static int event_hist_debug_open(struct inode *inode, struct file *file) |
5900 | { |
5901 | int ret; |
5902 | |
5903 | ret = security_locked_down(what: LOCKDOWN_TRACEFS); |
5904 | if (ret) |
5905 | return ret; |
5906 | |
5907 | return single_open(file, hist_debug_show, file); |
5908 | } |
5909 | |
5910 | const struct file_operations event_hist_debug_fops = { |
5911 | .open = event_hist_debug_open, |
5912 | .read = seq_read, |
5913 | .llseek = seq_lseek, |
5914 | .release = single_release, |
5915 | }; |
5916 | #endif |
5917 | |
5918 | static void hist_field_print(struct seq_file *m, struct hist_field *hist_field) |
5919 | { |
5920 | const char *field_name = hist_field_name(field: hist_field, level: 0); |
5921 | |
5922 | if (hist_field->var.name) |
5923 | seq_printf(m, fmt: "%s=" , hist_field->var.name); |
5924 | |
5925 | if (hist_field->flags & HIST_FIELD_FL_CPU) |
5926 | seq_puts(m, s: "common_cpu" ); |
5927 | else if (hist_field->flags & HIST_FIELD_FL_CONST) |
5928 | seq_printf(m, fmt: "%llu" , hist_field->constant); |
5929 | else if (field_name) { |
5930 | if (hist_field->flags & HIST_FIELD_FL_VAR_REF || |
5931 | hist_field->flags & HIST_FIELD_FL_ALIAS) |
5932 | seq_putc(m, c: '$'); |
5933 | seq_printf(m, fmt: "%s" , field_name); |
5934 | } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP) |
5935 | seq_puts(m, s: "common_timestamp" ); |
5936 | |
5937 | if (hist_field->flags) { |
5938 | if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) && |
5939 | !(hist_field->flags & HIST_FIELD_FL_EXPR) && |
5940 | !(hist_field->flags & HIST_FIELD_FL_STACKTRACE)) { |
5941 | const char *flags = get_hist_field_flags(hist_field); |
5942 | |
5943 | if (flags) |
5944 | seq_printf(m, fmt: ".%s" , flags); |
5945 | } |
5946 | } |
5947 | if (hist_field->buckets) |
5948 | seq_printf(m, fmt: "=%ld" , hist_field->buckets); |
5949 | } |
5950 | |
5951 | static int event_hist_trigger_print(struct seq_file *m, |
5952 | struct event_trigger_data *data) |
5953 | { |
5954 | struct hist_trigger_data *hist_data = data->private_data; |
5955 | struct hist_field *field; |
5956 | bool have_var = false; |
5957 | bool show_val = false; |
5958 | unsigned int i; |
5959 | |
5960 | seq_puts(m, HIST_PREFIX); |
5961 | |
5962 | if (data->name) |
5963 | seq_printf(m, fmt: "%s:" , data->name); |
5964 | |
5965 | seq_puts(m, s: "keys=" ); |
5966 | |
5967 | for_each_hist_key_field(i, hist_data) { |
5968 | field = hist_data->fields[i]; |
5969 | |
5970 | if (i > hist_data->n_vals) |
5971 | seq_puts(m, s: "," ); |
5972 | |
5973 | if (field->flags & HIST_FIELD_FL_STACKTRACE) { |
5974 | if (field->field) |
5975 | seq_printf(m, fmt: "%s.stacktrace" , field->field->name); |
5976 | else |
5977 | seq_puts(m, s: "common_stacktrace" ); |
5978 | } else |
5979 | hist_field_print(m, hist_field: field); |
5980 | } |
5981 | |
5982 | seq_puts(m, s: ":vals=" ); |
5983 | |
5984 | for_each_hist_val_field(i, hist_data) { |
5985 | field = hist_data->fields[i]; |
5986 | if (field->flags & HIST_FIELD_FL_VAR) { |
5987 | have_var = true; |
5988 | continue; |
5989 | } |
5990 | |
5991 | if (i == HITCOUNT_IDX) { |
5992 | if (hist_data->attrs->no_hitcount) |
5993 | continue; |
5994 | seq_puts(m, s: "hitcount" ); |
5995 | } else { |
5996 | if (show_val) |
5997 | seq_puts(m, s: "," ); |
5998 | hist_field_print(m, hist_field: field); |
5999 | } |
6000 | show_val = true; |
6001 | } |
6002 | |
6003 | if (have_var) { |
6004 | unsigned int n = 0; |
6005 | |
6006 | seq_puts(m, s: ":" ); |
6007 | |
6008 | for_each_hist_val_field(i, hist_data) { |
6009 | field = hist_data->fields[i]; |
6010 | |
6011 | if (field->flags & HIST_FIELD_FL_VAR) { |
6012 | if (n++) |
6013 | seq_puts(m, s: "," ); |
6014 | hist_field_print(m, hist_field: field); |
6015 | } |
6016 | } |
6017 | } |
6018 | |
6019 | seq_puts(m, s: ":sort=" ); |
6020 | |
6021 | for (i = 0; i < hist_data->n_sort_keys; i++) { |
6022 | struct tracing_map_sort_key *sort_key; |
6023 | unsigned int idx, first_key_idx; |
6024 | |
6025 | /* skip VAR vals */ |
6026 | first_key_idx = hist_data->n_vals - hist_data->n_vars; |
6027 | |
6028 | sort_key = &hist_data->sort_keys[i]; |
6029 | idx = sort_key->field_idx; |
6030 | |
6031 | if (WARN_ON(idx >= HIST_FIELDS_MAX)) |
6032 | return -EINVAL; |
6033 | |
6034 | if (i > 0) |
6035 | seq_puts(m, s: "," ); |
6036 | |
6037 | if (idx == HITCOUNT_IDX) |
6038 | seq_puts(m, s: "hitcount" ); |
6039 | else { |
6040 | if (idx >= first_key_idx) |
6041 | idx += hist_data->n_vars; |
6042 | hist_field_print(m, hist_field: hist_data->fields[idx]); |
6043 | } |
6044 | |
6045 | if (sort_key->descending) |
6046 | seq_puts(m, s: ".descending" ); |
6047 | } |
6048 | seq_printf(m, fmt: ":size=%u" , (1 << hist_data->map->map_bits)); |
6049 | if (hist_data->enable_timestamps) |
6050 | seq_printf(m, fmt: ":clock=%s" , hist_data->attrs->clock); |
6051 | if (hist_data->attrs->no_hitcount) |
6052 | seq_puts(m, s: ":nohitcount" ); |
6053 | |
6054 | print_actions_spec(m, hist_data); |
6055 | |
6056 | if (data->filter_str) |
6057 | seq_printf(m, fmt: " if %s" , data->filter_str); |
6058 | |
6059 | if (data->paused) |
6060 | seq_puts(m, s: " [paused]" ); |
6061 | else |
6062 | seq_puts(m, s: " [active]" ); |
6063 | |
6064 | seq_putc(m, c: '\n'); |
6065 | |
6066 | return 0; |
6067 | } |
6068 | |
6069 | static int event_hist_trigger_init(struct event_trigger_data *data) |
6070 | { |
6071 | struct hist_trigger_data *hist_data = data->private_data; |
6072 | |
6073 | if (!data->ref && hist_data->attrs->name) |
6074 | save_named_trigger(name: hist_data->attrs->name, data); |
6075 | |
6076 | data->ref++; |
6077 | |
6078 | return 0; |
6079 | } |
6080 | |
6081 | static void unregister_field_var_hists(struct hist_trigger_data *hist_data) |
6082 | { |
6083 | struct trace_event_file *file; |
6084 | unsigned int i; |
6085 | char *cmd; |
6086 | int ret; |
6087 | |
6088 | for (i = 0; i < hist_data->n_field_var_hists; i++) { |
6089 | file = hist_data->field_var_hists[i]->hist_data->event_file; |
6090 | cmd = hist_data->field_var_hists[i]->cmd; |
6091 | ret = event_hist_trigger_parse(cmd_ops: &trigger_hist_cmd, file, |
6092 | glob: "!hist" , cmd: "hist" , param_and_filter: cmd); |
6093 | WARN_ON_ONCE(ret < 0); |
6094 | } |
6095 | } |
6096 | |
6097 | static void event_hist_trigger_free(struct event_trigger_data *data) |
6098 | { |
6099 | struct hist_trigger_data *hist_data = data->private_data; |
6100 | |
6101 | if (WARN_ON_ONCE(data->ref <= 0)) |
6102 | return; |
6103 | |
6104 | data->ref--; |
6105 | if (!data->ref) { |
6106 | if (data->name) |
6107 | del_named_trigger(data); |
6108 | |
6109 | trigger_data_free(data); |
6110 | |
6111 | remove_hist_vars(hist_data); |
6112 | |
6113 | unregister_field_var_hists(hist_data); |
6114 | |
6115 | destroy_hist_data(hist_data); |
6116 | } |
6117 | } |
6118 | |
6119 | static struct event_trigger_ops event_hist_trigger_ops = { |
6120 | .trigger = event_hist_trigger, |
6121 | .print = event_hist_trigger_print, |
6122 | .init = event_hist_trigger_init, |
6123 | .free = event_hist_trigger_free, |
6124 | }; |
6125 | |
6126 | static int event_hist_trigger_named_init(struct event_trigger_data *data) |
6127 | { |
6128 | data->ref++; |
6129 | |
6130 | save_named_trigger(name: data->named_data->name, data); |
6131 | |
6132 | event_hist_trigger_init(data: data->named_data); |
6133 | |
6134 | return 0; |
6135 | } |
6136 | |
6137 | static void event_hist_trigger_named_free(struct event_trigger_data *data) |
6138 | { |
6139 | if (WARN_ON_ONCE(data->ref <= 0)) |
6140 | return; |
6141 | |
6142 | event_hist_trigger_free(data: data->named_data); |
6143 | |
6144 | data->ref--; |
6145 | if (!data->ref) { |
6146 | del_named_trigger(data); |
6147 | trigger_data_free(data); |
6148 | } |
6149 | } |
6150 | |
6151 | static struct event_trigger_ops event_hist_trigger_named_ops = { |
6152 | .trigger = event_hist_trigger, |
6153 | .print = event_hist_trigger_print, |
6154 | .init = event_hist_trigger_named_init, |
6155 | .free = event_hist_trigger_named_free, |
6156 | }; |
6157 | |
6158 | static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd, |
6159 | char *param) |
6160 | { |
6161 | return &event_hist_trigger_ops; |
6162 | } |
6163 | |
6164 | static void hist_clear(struct event_trigger_data *data) |
6165 | { |
6166 | struct hist_trigger_data *hist_data = data->private_data; |
6167 | |
6168 | if (data->name) |
6169 | pause_named_trigger(data); |
6170 | |
6171 | tracepoint_synchronize_unregister(); |
6172 | |
6173 | tracing_map_clear(map: hist_data->map); |
6174 | |
6175 | if (data->name) |
6176 | unpause_named_trigger(data); |
6177 | } |
6178 | |
6179 | static bool compatible_field(struct ftrace_event_field *field, |
6180 | struct ftrace_event_field *test_field) |
6181 | { |
6182 | if (field == test_field) |
6183 | return true; |
6184 | if (field == NULL || test_field == NULL) |
6185 | return false; |
6186 | if (strcmp(field->name, test_field->name) != 0) |
6187 | return false; |
6188 | if (strcmp(field->type, test_field->type) != 0) |
6189 | return false; |
6190 | if (field->size != test_field->size) |
6191 | return false; |
6192 | if (field->is_signed != test_field->is_signed) |
6193 | return false; |
6194 | |
6195 | return true; |
6196 | } |
6197 | |
6198 | static bool hist_trigger_match(struct event_trigger_data *data, |
6199 | struct event_trigger_data *data_test, |
6200 | struct event_trigger_data *named_data, |
6201 | bool ignore_filter) |
6202 | { |
6203 | struct tracing_map_sort_key *sort_key, *sort_key_test; |
6204 | struct hist_trigger_data *hist_data, *hist_data_test; |
6205 | struct hist_field *key_field, *key_field_test; |
6206 | unsigned int i; |
6207 | |
6208 | if (named_data && (named_data != data_test) && |
6209 | (named_data != data_test->named_data)) |
6210 | return false; |
6211 | |
6212 | if (!named_data && is_named_trigger(test: data_test)) |
6213 | return false; |
6214 | |
6215 | hist_data = data->private_data; |
6216 | hist_data_test = data_test->private_data; |
6217 | |
6218 | if (hist_data->n_vals != hist_data_test->n_vals || |
6219 | hist_data->n_fields != hist_data_test->n_fields || |
6220 | hist_data->n_sort_keys != hist_data_test->n_sort_keys) |
6221 | return false; |
6222 | |
6223 | if (!ignore_filter) { |
6224 | if ((data->filter_str && !data_test->filter_str) || |
6225 | (!data->filter_str && data_test->filter_str)) |
6226 | return false; |
6227 | } |
6228 | |
6229 | for_each_hist_field(i, hist_data) { |
6230 | key_field = hist_data->fields[i]; |
6231 | key_field_test = hist_data_test->fields[i]; |
6232 | |
6233 | if (key_field->flags != key_field_test->flags) |
6234 | return false; |
6235 | if (!compatible_field(field: key_field->field, test_field: key_field_test->field)) |
6236 | return false; |
6237 | if (key_field->offset != key_field_test->offset) |
6238 | return false; |
6239 | if (key_field->size != key_field_test->size) |
6240 | return false; |
6241 | if (key_field->is_signed != key_field_test->is_signed) |
6242 | return false; |
6243 | if (!!key_field->var.name != !!key_field_test->var.name) |
6244 | return false; |
6245 | if (key_field->var.name && |
6246 | strcmp(key_field->var.name, key_field_test->var.name) != 0) |
6247 | return false; |
6248 | } |
6249 | |
6250 | for (i = 0; i < hist_data->n_sort_keys; i++) { |
6251 | sort_key = &hist_data->sort_keys[i]; |
6252 | sort_key_test = &hist_data_test->sort_keys[i]; |
6253 | |
6254 | if (sort_key->field_idx != sort_key_test->field_idx || |
6255 | sort_key->descending != sort_key_test->descending) |
6256 | return false; |
6257 | } |
6258 | |
6259 | if (!ignore_filter && data->filter_str && |
6260 | (strcmp(data->filter_str, data_test->filter_str) != 0)) |
6261 | return false; |
6262 | |
6263 | if (!actions_match(hist_data, hist_data_test)) |
6264 | return false; |
6265 | |
6266 | return true; |
6267 | } |
6268 | |
6269 | static bool existing_hist_update_only(char *glob, |
6270 | struct event_trigger_data *data, |
6271 | struct trace_event_file *file) |
6272 | { |
6273 | struct hist_trigger_data *hist_data = data->private_data; |
6274 | struct event_trigger_data *test, *named_data = NULL; |
6275 | bool updated = false; |
6276 | |
6277 | if (!hist_data->attrs->pause && !hist_data->attrs->cont && |
6278 | !hist_data->attrs->clear) |
6279 | goto out; |
6280 | |
6281 | if (hist_data->attrs->name) { |
6282 | named_data = find_named_trigger(name: hist_data->attrs->name); |
6283 | if (named_data) { |
6284 | if (!hist_trigger_match(data, data_test: named_data, named_data, |
6285 | ignore_filter: true)) |
6286 | goto out; |
6287 | } |
6288 | } |
6289 | |
6290 | if (hist_data->attrs->name && !named_data) |
6291 | goto out; |
6292 | |
6293 | list_for_each_entry(test, &file->triggers, list) { |
6294 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6295 | if (!hist_trigger_match(data, data_test: test, named_data, ignore_filter: false)) |
6296 | continue; |
6297 | if (hist_data->attrs->pause) |
6298 | test->paused = true; |
6299 | else if (hist_data->attrs->cont) |
6300 | test->paused = false; |
6301 | else if (hist_data->attrs->clear) |
6302 | hist_clear(data: test); |
6303 | updated = true; |
6304 | goto out; |
6305 | } |
6306 | } |
6307 | out: |
6308 | return updated; |
6309 | } |
6310 | |
6311 | static int hist_register_trigger(char *glob, |
6312 | struct event_trigger_data *data, |
6313 | struct trace_event_file *file) |
6314 | { |
6315 | struct hist_trigger_data *hist_data = data->private_data; |
6316 | struct event_trigger_data *test, *named_data = NULL; |
6317 | struct trace_array *tr = file->tr; |
6318 | int ret = 0; |
6319 | |
6320 | if (hist_data->attrs->name) { |
6321 | named_data = find_named_trigger(name: hist_data->attrs->name); |
6322 | if (named_data) { |
6323 | if (!hist_trigger_match(data, data_test: named_data, named_data, |
6324 | ignore_filter: true)) { |
6325 | hist_err(tr, err_type: HIST_ERR_NAMED_MISMATCH, err_pos: errpos(str: hist_data->attrs->name)); |
6326 | ret = -EINVAL; |
6327 | goto out; |
6328 | } |
6329 | } |
6330 | } |
6331 | |
6332 | if (hist_data->attrs->name && !named_data) |
6333 | goto new; |
6334 | |
6335 | lockdep_assert_held(&event_mutex); |
6336 | |
6337 | list_for_each_entry(test, &file->triggers, list) { |
6338 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6339 | if (hist_trigger_match(data, data_test: test, named_data, ignore_filter: false)) { |
6340 | hist_err(tr, err_type: HIST_ERR_TRIGGER_EEXIST, err_pos: 0); |
6341 | ret = -EEXIST; |
6342 | goto out; |
6343 | } |
6344 | } |
6345 | } |
6346 | new: |
6347 | if (hist_data->attrs->cont || hist_data->attrs->clear) { |
6348 | hist_err(tr, err_type: HIST_ERR_TRIGGER_ENOENT_CLEAR, err_pos: 0); |
6349 | ret = -ENOENT; |
6350 | goto out; |
6351 | } |
6352 | |
6353 | if (hist_data->attrs->pause) |
6354 | data->paused = true; |
6355 | |
6356 | if (named_data) { |
6357 | data->private_data = named_data->private_data; |
6358 | set_named_trigger_data(data, named_data); |
6359 | data->ops = &event_hist_trigger_named_ops; |
6360 | } |
6361 | |
6362 | if (data->ops->init) { |
6363 | ret = data->ops->init(data); |
6364 | if (ret < 0) |
6365 | goto out; |
6366 | } |
6367 | |
6368 | if (hist_data->enable_timestamps) { |
6369 | char *clock = hist_data->attrs->clock; |
6370 | |
6371 | ret = tracing_set_clock(tr: file->tr, clockstr: hist_data->attrs->clock); |
6372 | if (ret) { |
6373 | hist_err(tr, err_type: HIST_ERR_SET_CLOCK_FAIL, err_pos: errpos(str: clock)); |
6374 | goto out; |
6375 | } |
6376 | |
6377 | tracing_set_filter_buffering(tr: file->tr, set: true); |
6378 | } |
6379 | |
6380 | if (named_data) |
6381 | destroy_hist_data(hist_data); |
6382 | out: |
6383 | return ret; |
6384 | } |
6385 | |
6386 | static int hist_trigger_enable(struct event_trigger_data *data, |
6387 | struct trace_event_file *file) |
6388 | { |
6389 | int ret = 0; |
6390 | |
6391 | list_add_tail_rcu(new: &data->list, head: &file->triggers); |
6392 | |
6393 | update_cond_flag(file); |
6394 | |
6395 | if (trace_event_trigger_enable_disable(file, trigger_enable: 1) < 0) { |
6396 | list_del_rcu(entry: &data->list); |
6397 | update_cond_flag(file); |
6398 | ret--; |
6399 | } |
6400 | |
6401 | return ret; |
6402 | } |
6403 | |
6404 | static bool have_hist_trigger_match(struct event_trigger_data *data, |
6405 | struct trace_event_file *file) |
6406 | { |
6407 | struct hist_trigger_data *hist_data = data->private_data; |
6408 | struct event_trigger_data *test, *named_data = NULL; |
6409 | bool match = false; |
6410 | |
6411 | lockdep_assert_held(&event_mutex); |
6412 | |
6413 | if (hist_data->attrs->name) |
6414 | named_data = find_named_trigger(name: hist_data->attrs->name); |
6415 | |
6416 | list_for_each_entry(test, &file->triggers, list) { |
6417 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6418 | if (hist_trigger_match(data, data_test: test, named_data, ignore_filter: false)) { |
6419 | match = true; |
6420 | break; |
6421 | } |
6422 | } |
6423 | } |
6424 | |
6425 | return match; |
6426 | } |
6427 | |
6428 | static bool hist_trigger_check_refs(struct event_trigger_data *data, |
6429 | struct trace_event_file *file) |
6430 | { |
6431 | struct hist_trigger_data *hist_data = data->private_data; |
6432 | struct event_trigger_data *test, *named_data = NULL; |
6433 | |
6434 | lockdep_assert_held(&event_mutex); |
6435 | |
6436 | if (hist_data->attrs->name) |
6437 | named_data = find_named_trigger(name: hist_data->attrs->name); |
6438 | |
6439 | list_for_each_entry(test, &file->triggers, list) { |
6440 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6441 | if (!hist_trigger_match(data, data_test: test, named_data, ignore_filter: false)) |
6442 | continue; |
6443 | hist_data = test->private_data; |
6444 | if (check_var_refs(hist_data)) |
6445 | return true; |
6446 | break; |
6447 | } |
6448 | } |
6449 | |
6450 | return false; |
6451 | } |
6452 | |
6453 | static void hist_unregister_trigger(char *glob, |
6454 | struct event_trigger_data *data, |
6455 | struct trace_event_file *file) |
6456 | { |
6457 | struct event_trigger_data *test = NULL, *iter, *named_data = NULL; |
6458 | struct hist_trigger_data *hist_data = data->private_data; |
6459 | |
6460 | lockdep_assert_held(&event_mutex); |
6461 | |
6462 | if (hist_data->attrs->name) |
6463 | named_data = find_named_trigger(name: hist_data->attrs->name); |
6464 | |
6465 | list_for_each_entry(iter, &file->triggers, list) { |
6466 | if (iter->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6467 | if (!hist_trigger_match(data, data_test: iter, named_data, ignore_filter: false)) |
6468 | continue; |
6469 | test = iter; |
6470 | list_del_rcu(entry: &test->list); |
6471 | trace_event_trigger_enable_disable(file, trigger_enable: 0); |
6472 | update_cond_flag(file); |
6473 | break; |
6474 | } |
6475 | } |
6476 | |
6477 | if (test && test->ops->free) |
6478 | test->ops->free(test); |
6479 | |
6480 | if (hist_data->enable_timestamps) { |
6481 | if (!hist_data->remove || test) |
6482 | tracing_set_filter_buffering(tr: file->tr, set: false); |
6483 | } |
6484 | } |
6485 | |
6486 | static bool hist_file_check_refs(struct trace_event_file *file) |
6487 | { |
6488 | struct hist_trigger_data *hist_data; |
6489 | struct event_trigger_data *test; |
6490 | |
6491 | lockdep_assert_held(&event_mutex); |
6492 | |
6493 | list_for_each_entry(test, &file->triggers, list) { |
6494 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6495 | hist_data = test->private_data; |
6496 | if (check_var_refs(hist_data)) |
6497 | return true; |
6498 | } |
6499 | } |
6500 | |
6501 | return false; |
6502 | } |
6503 | |
6504 | static void hist_unreg_all(struct trace_event_file *file) |
6505 | { |
6506 | struct event_trigger_data *test, *n; |
6507 | struct hist_trigger_data *hist_data; |
6508 | struct synth_event *se; |
6509 | const char *se_name; |
6510 | |
6511 | lockdep_assert_held(&event_mutex); |
6512 | |
6513 | if (hist_file_check_refs(file)) |
6514 | return; |
6515 | |
6516 | list_for_each_entry_safe(test, n, &file->triggers, list) { |
6517 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6518 | hist_data = test->private_data; |
6519 | list_del_rcu(entry: &test->list); |
6520 | trace_event_trigger_enable_disable(file, trigger_enable: 0); |
6521 | |
6522 | se_name = trace_event_name(call: file->event_call); |
6523 | se = find_synth_event(name: se_name); |
6524 | if (se) |
6525 | se->ref--; |
6526 | |
6527 | update_cond_flag(file); |
6528 | if (hist_data->enable_timestamps) |
6529 | tracing_set_filter_buffering(tr: file->tr, set: false); |
6530 | if (test->ops->free) |
6531 | test->ops->free(test); |
6532 | } |
6533 | } |
6534 | } |
6535 | |
6536 | static int event_hist_trigger_parse(struct event_command *cmd_ops, |
6537 | struct trace_event_file *file, |
6538 | char *glob, char *cmd, |
6539 | char *param_and_filter) |
6540 | { |
6541 | unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT; |
6542 | struct event_trigger_data *trigger_data; |
6543 | struct hist_trigger_attrs *attrs; |
6544 | struct hist_trigger_data *hist_data; |
6545 | char *param, *filter, *p, *start; |
6546 | struct synth_event *se; |
6547 | const char *se_name; |
6548 | bool remove; |
6549 | int ret = 0; |
6550 | |
6551 | lockdep_assert_held(&event_mutex); |
6552 | |
6553 | if (WARN_ON(!glob)) |
6554 | return -EINVAL; |
6555 | |
6556 | if (glob[0]) { |
6557 | hist_err_clear(); |
6558 | last_cmd_set(file, str: param_and_filter); |
6559 | } |
6560 | |
6561 | remove = event_trigger_check_remove(glob); |
6562 | |
6563 | if (event_trigger_empty_param(param: param_and_filter)) |
6564 | return -EINVAL; |
6565 | |
6566 | /* |
6567 | * separate the trigger from the filter (k:v [if filter]) |
6568 | * allowing for whitespace in the trigger |
6569 | */ |
6570 | p = param = param_and_filter; |
6571 | do { |
6572 | p = strstr(p, "if" ); |
6573 | if (!p) |
6574 | break; |
6575 | if (p == param_and_filter) |
6576 | return -EINVAL; |
6577 | if (*(p - 1) != ' ' && *(p - 1) != '\t') { |
6578 | p++; |
6579 | continue; |
6580 | } |
6581 | if (p >= param_and_filter + strlen(param_and_filter) - (sizeof("if" ) - 1) - 1) |
6582 | return -EINVAL; |
6583 | if (*(p + sizeof("if" ) - 1) != ' ' && *(p + sizeof("if" ) - 1) != '\t') { |
6584 | p++; |
6585 | continue; |
6586 | } |
6587 | break; |
6588 | } while (1); |
6589 | |
6590 | if (!p) |
6591 | filter = NULL; |
6592 | else { |
6593 | *(p - 1) = '\0'; |
6594 | filter = strstrip(str: p); |
6595 | param = strstrip(str: param); |
6596 | } |
6597 | |
6598 | /* |
6599 | * To simplify arithmetic expression parsing, replace occurrences of |
6600 | * '.sym-offset' modifier with '.symXoffset' |
6601 | */ |
6602 | start = strstr(param, ".sym-offset" ); |
6603 | while (start) { |
6604 | *(start + 4) = 'X'; |
6605 | start = strstr(start + 11, ".sym-offset" ); |
6606 | } |
6607 | |
6608 | attrs = parse_hist_trigger_attrs(tr: file->tr, trigger_str: param); |
6609 | if (IS_ERR(ptr: attrs)) |
6610 | return PTR_ERR(ptr: attrs); |
6611 | |
6612 | if (attrs->map_bits) |
6613 | hist_trigger_bits = attrs->map_bits; |
6614 | |
6615 | hist_data = create_hist_data(map_bits: hist_trigger_bits, attrs, file, remove); |
6616 | if (IS_ERR(ptr: hist_data)) { |
6617 | destroy_hist_trigger_attrs(attrs); |
6618 | return PTR_ERR(ptr: hist_data); |
6619 | } |
6620 | |
6621 | trigger_data = event_trigger_alloc(cmd_ops, cmd, param, private_data: hist_data); |
6622 | if (!trigger_data) { |
6623 | ret = -ENOMEM; |
6624 | goto out_free; |
6625 | } |
6626 | |
6627 | ret = event_trigger_set_filter(cmd_ops, file, param: filter, trigger_data); |
6628 | if (ret < 0) |
6629 | goto out_free; |
6630 | |
6631 | if (remove) { |
6632 | if (!have_hist_trigger_match(data: trigger_data, file)) |
6633 | goto out_free; |
6634 | |
6635 | if (hist_trigger_check_refs(data: trigger_data, file)) { |
6636 | ret = -EBUSY; |
6637 | goto out_free; |
6638 | } |
6639 | |
6640 | event_trigger_unregister(cmd_ops, file, glob: glob+1, trigger_data); |
6641 | se_name = trace_event_name(call: file->event_call); |
6642 | se = find_synth_event(name: se_name); |
6643 | if (se) |
6644 | se->ref--; |
6645 | ret = 0; |
6646 | goto out_free; |
6647 | } |
6648 | |
6649 | if (existing_hist_update_only(glob, data: trigger_data, file)) |
6650 | goto out_free; |
6651 | |
6652 | ret = event_trigger_register(cmd_ops, file, glob, trigger_data); |
6653 | if (ret < 0) |
6654 | goto out_free; |
6655 | |
6656 | if (get_named_trigger_data(data: trigger_data)) |
6657 | goto enable; |
6658 | |
6659 | ret = create_actions(hist_data); |
6660 | if (ret) |
6661 | goto out_unreg; |
6662 | |
6663 | if (has_hist_vars(hist_data) || hist_data->n_var_refs) { |
6664 | ret = save_hist_vars(hist_data); |
6665 | if (ret) |
6666 | goto out_unreg; |
6667 | } |
6668 | |
6669 | ret = tracing_map_init(map: hist_data->map); |
6670 | if (ret) |
6671 | goto out_unreg; |
6672 | enable: |
6673 | ret = hist_trigger_enable(data: trigger_data, file); |
6674 | if (ret) |
6675 | goto out_unreg; |
6676 | |
6677 | se_name = trace_event_name(call: file->event_call); |
6678 | se = find_synth_event(name: se_name); |
6679 | if (se) |
6680 | se->ref++; |
6681 | out: |
6682 | if (ret == 0 && glob[0]) |
6683 | hist_err_clear(); |
6684 | |
6685 | return ret; |
6686 | out_unreg: |
6687 | event_trigger_unregister(cmd_ops, file, glob: glob+1, trigger_data); |
6688 | out_free: |
6689 | event_trigger_reset_filter(cmd_ops, trigger_data); |
6690 | |
6691 | remove_hist_vars(hist_data); |
6692 | |
6693 | kfree(objp: trigger_data); |
6694 | |
6695 | destroy_hist_data(hist_data); |
6696 | goto out; |
6697 | } |
6698 | |
6699 | static struct event_command trigger_hist_cmd = { |
6700 | .name = "hist" , |
6701 | .trigger_type = ETT_EVENT_HIST, |
6702 | .flags = EVENT_CMD_FL_NEEDS_REC, |
6703 | .parse = event_hist_trigger_parse, |
6704 | .reg = hist_register_trigger, |
6705 | .unreg = hist_unregister_trigger, |
6706 | .unreg_all = hist_unreg_all, |
6707 | .get_trigger_ops = event_hist_get_trigger_ops, |
6708 | .set_filter = set_trigger_filter, |
6709 | }; |
6710 | |
6711 | __init int register_trigger_hist_cmd(void) |
6712 | { |
6713 | int ret; |
6714 | |
6715 | ret = register_event_command(cmd: &trigger_hist_cmd); |
6716 | WARN_ON(ret < 0); |
6717 | |
6718 | return ret; |
6719 | } |
6720 | |
6721 | static void |
6722 | hist_enable_trigger(struct event_trigger_data *data, |
6723 | struct trace_buffer *buffer, void *rec, |
6724 | struct ring_buffer_event *event) |
6725 | { |
6726 | struct enable_trigger_data *enable_data = data->private_data; |
6727 | struct event_trigger_data *test; |
6728 | |
6729 | list_for_each_entry_rcu(test, &enable_data->file->triggers, list, |
6730 | lockdep_is_held(&event_mutex)) { |
6731 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6732 | if (enable_data->enable) |
6733 | test->paused = false; |
6734 | else |
6735 | test->paused = true; |
6736 | } |
6737 | } |
6738 | } |
6739 | |
6740 | static void |
6741 | hist_enable_count_trigger(struct event_trigger_data *data, |
6742 | struct trace_buffer *buffer, void *rec, |
6743 | struct ring_buffer_event *event) |
6744 | { |
6745 | if (!data->count) |
6746 | return; |
6747 | |
6748 | if (data->count != -1) |
6749 | (data->count)--; |
6750 | |
6751 | hist_enable_trigger(data, buffer, rec, event); |
6752 | } |
6753 | |
6754 | static struct event_trigger_ops hist_enable_trigger_ops = { |
6755 | .trigger = hist_enable_trigger, |
6756 | .print = event_enable_trigger_print, |
6757 | .init = event_trigger_init, |
6758 | .free = event_enable_trigger_free, |
6759 | }; |
6760 | |
6761 | static struct event_trigger_ops hist_enable_count_trigger_ops = { |
6762 | .trigger = hist_enable_count_trigger, |
6763 | .print = event_enable_trigger_print, |
6764 | .init = event_trigger_init, |
6765 | .free = event_enable_trigger_free, |
6766 | }; |
6767 | |
6768 | static struct event_trigger_ops hist_disable_trigger_ops = { |
6769 | .trigger = hist_enable_trigger, |
6770 | .print = event_enable_trigger_print, |
6771 | .init = event_trigger_init, |
6772 | .free = event_enable_trigger_free, |
6773 | }; |
6774 | |
6775 | static struct event_trigger_ops hist_disable_count_trigger_ops = { |
6776 | .trigger = hist_enable_count_trigger, |
6777 | .print = event_enable_trigger_print, |
6778 | .init = event_trigger_init, |
6779 | .free = event_enable_trigger_free, |
6780 | }; |
6781 | |
6782 | static struct event_trigger_ops * |
6783 | hist_enable_get_trigger_ops(char *cmd, char *param) |
6784 | { |
6785 | struct event_trigger_ops *ops; |
6786 | bool enable; |
6787 | |
6788 | enable = (strcmp(cmd, ENABLE_HIST_STR) == 0); |
6789 | |
6790 | if (enable) |
6791 | ops = param ? &hist_enable_count_trigger_ops : |
6792 | &hist_enable_trigger_ops; |
6793 | else |
6794 | ops = param ? &hist_disable_count_trigger_ops : |
6795 | &hist_disable_trigger_ops; |
6796 | |
6797 | return ops; |
6798 | } |
6799 | |
6800 | static void hist_enable_unreg_all(struct trace_event_file *file) |
6801 | { |
6802 | struct event_trigger_data *test, *n; |
6803 | |
6804 | list_for_each_entry_safe(test, n, &file->triggers, list) { |
6805 | if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) { |
6806 | list_del_rcu(entry: &test->list); |
6807 | update_cond_flag(file); |
6808 | trace_event_trigger_enable_disable(file, trigger_enable: 0); |
6809 | if (test->ops->free) |
6810 | test->ops->free(test); |
6811 | } |
6812 | } |
6813 | } |
6814 | |
6815 | static struct event_command trigger_hist_enable_cmd = { |
6816 | .name = ENABLE_HIST_STR, |
6817 | .trigger_type = ETT_HIST_ENABLE, |
6818 | .parse = event_enable_trigger_parse, |
6819 | .reg = event_enable_register_trigger, |
6820 | .unreg = event_enable_unregister_trigger, |
6821 | .unreg_all = hist_enable_unreg_all, |
6822 | .get_trigger_ops = hist_enable_get_trigger_ops, |
6823 | .set_filter = set_trigger_filter, |
6824 | }; |
6825 | |
6826 | static struct event_command trigger_hist_disable_cmd = { |
6827 | .name = DISABLE_HIST_STR, |
6828 | .trigger_type = ETT_HIST_ENABLE, |
6829 | .parse = event_enable_trigger_parse, |
6830 | .reg = event_enable_register_trigger, |
6831 | .unreg = event_enable_unregister_trigger, |
6832 | .unreg_all = hist_enable_unreg_all, |
6833 | .get_trigger_ops = hist_enable_get_trigger_ops, |
6834 | .set_filter = set_trigger_filter, |
6835 | }; |
6836 | |
6837 | static __init void unregister_trigger_hist_enable_disable_cmds(void) |
6838 | { |
6839 | unregister_event_command(cmd: &trigger_hist_enable_cmd); |
6840 | unregister_event_command(cmd: &trigger_hist_disable_cmd); |
6841 | } |
6842 | |
6843 | __init int register_trigger_hist_enable_disable_cmds(void) |
6844 | { |
6845 | int ret; |
6846 | |
6847 | ret = register_event_command(cmd: &trigger_hist_enable_cmd); |
6848 | if (WARN_ON(ret < 0)) |
6849 | return ret; |
6850 | ret = register_event_command(cmd: &trigger_hist_disable_cmd); |
6851 | if (WARN_ON(ret < 0)) |
6852 | unregister_trigger_hist_enable_disable_cmds(); |
6853 | |
6854 | return ret; |
6855 | } |
6856 | |