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bcea3f96 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7ef224d1 TZ |
2 | /* |
3 | * trace_events_hist - trace event hist triggers | |
4 | * | |
7ef224d1 TZ |
5 | * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com> |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/kallsyms.h> | |
17911ff3 | 10 | #include <linux/security.h> |
7ef224d1 TZ |
11 | #include <linux/mutex.h> |
12 | #include <linux/slab.h> | |
13 | #include <linux/stacktrace.h> | |
b2d09103 | 14 | #include <linux/rculist.h> |
4b147936 | 15 | #include <linux/tracefs.h> |
7ef224d1 | 16 | |
ac681546 ZX |
17 | /* for gfp flag names */ |
18 | #include <linux/trace_events.h> | |
19 | #include <trace/events/mmflags.h> | |
20 | ||
7ef224d1 | 21 | #include "tracing_map.h" |
726721a5 | 22 | #include "trace_synth.h" |
4b147936 | 23 | |
d566c5e9 TZ |
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"), \ | |
c8d94a18 | 61 | C(INVALID_REF_KEY, "Using variable references in keys not supported"), \ |
d566c5e9 | 62 | C(VAR_NOT_FOUND, "Couldn't find variable"), \ |
4de26c8c TZ |
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)"), \ | |
a9d10ca4 | 68 | C(INVALID_SORT_FIELD, "Sort field must be a key or a val"), \ |
52cfb373 | 69 | C(INVALID_STR_OPERAND, "String type can not be an operand in expression"), \ |
9710b2f3 | 70 | C(EXPECT_NUMBER, "Expecting numeric literal"), \ |
8b5d46fd | 71 | C(UNARY_MINUS_SUBEXPR, "Unary minus not supported in sub-expressions"), \ |
ccf47f5c MHG |
72 | C(DIVISION_BY_ZERO, "Division by zero"), \ |
73 | C(NEED_NOHC_VAL, "Non-hitcount value is required for 'nohitcount'"), | |
d566c5e9 TZ |
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 | ||
7ef224d1 TZ |
85 | struct hist_field; |
86 | ||
df35d93b TZ |
87 | typedef u64 (*hist_field_fn_t) (struct hist_field *field, |
88 | struct tracing_map_elt *elt, | |
b47e3302 | 89 | struct trace_buffer *buffer, |
df35d93b TZ |
90 | struct ring_buffer_event *rbe, |
91 | void *event); | |
7ef224d1 | 92 | |
5819eadd | 93 | #define HIST_FIELD_OPERANDS_MAX 2 |
30350d65 | 94 | #define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX) |
0212e2aa | 95 | #define HIST_ACTIONS_MAX 8 |
52cfb373 | 96 | #define HIST_CONST_DIGITS_MAX 21 |
8b5d46fd | 97 | #define HIST_DIV_SHIFT 20 /* For optimizing division by constants */ |
30350d65 | 98 | |
100719dc TZ |
99 | enum field_op_id { |
100 | FIELD_OP_NONE, | |
101 | FIELD_OP_PLUS, | |
102 | FIELD_OP_MINUS, | |
103 | FIELD_OP_UNARY_MINUS, | |
bcef0441 KS |
104 | FIELD_OP_DIV, |
105 | FIELD_OP_MULT, | |
100719dc TZ |
106 | }; |
107 | ||
86087383 SRG |
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 | }; | |
139 | ||
05ddb25c TZ |
140 | /* |
141 | * A hist_var (histogram variable) contains variable information for | |
142 | * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF | |
143 | * flag set. A hist_var has a variable name e.g. ts0, and is | |
144 | * associated with a given histogram trigger, as specified by | |
145 | * hist_data. The hist_var idx is the unique index assigned to the | |
146 | * variable by the hist trigger's tracing_map. The idx is what is | |
147 | * used to set a variable's value and, by a variable reference, to | |
148 | * retrieve it. | |
149 | */ | |
30350d65 TZ |
150 | struct hist_var { |
151 | char *name; | |
152 | struct hist_trigger_data *hist_data; | |
153 | unsigned int idx; | |
154 | }; | |
5819eadd | 155 | |
7ef224d1 TZ |
156 | struct hist_field { |
157 | struct ftrace_event_field *field; | |
158 | unsigned long flags; | |
de9a48a3 | 159 | unsigned long buckets; |
19a9facd | 160 | const char *type; |
5819eadd | 161 | struct hist_field *operands[HIST_FIELD_OPERANDS_MAX]; |
b559d003 | 162 | struct hist_trigger_data *hist_data; |
86087383 SRG |
163 | enum hist_field_fn fn_num; |
164 | unsigned int ref; | |
165 | unsigned int size; | |
166 | unsigned int offset; | |
167 | unsigned int is_signed; | |
05ddb25c TZ |
168 | |
169 | /* | |
170 | * Variable fields contain variable-specific info in var. | |
171 | */ | |
30350d65 | 172 | struct hist_var var; |
100719dc | 173 | enum field_op_id operator; |
067fe038 TZ |
174 | char *system; |
175 | char *event_name; | |
05ddb25c TZ |
176 | |
177 | /* | |
178 | * The name field is used for EXPR and VAR_REF fields. VAR | |
179 | * fields contain the variable name in var.name. | |
180 | */ | |
100719dc | 181 | char *name; |
05ddb25c TZ |
182 | |
183 | /* | |
184 | * When a histogram trigger is hit, if it has any references | |
185 | * to variables, the values of those variables are collected | |
186 | * into a var_ref_vals array by resolve_var_refs(). The | |
187 | * current value of each variable is read from the tracing_map | |
188 | * using the hist field's hist_var.idx and entered into the | |
189 | * var_ref_idx entry i.e. var_ref_vals[var_ref_idx]. | |
190 | */ | |
067fe038 TZ |
191 | unsigned int var_ref_idx; |
192 | bool read_once; | |
63a1e5de TZ |
193 | |
194 | unsigned int var_str_idx; | |
52cfb373 KS |
195 | |
196 | /* Numeric literals are represented as u64 */ | |
197 | u64 constant; | |
8b5d46fd KS |
198 | /* Used to optimize division by constants */ |
199 | u64 div_multiplier; | |
7ef224d1 TZ |
200 | }; |
201 | ||
86087383 SRG |
202 | static u64 hist_fn_call(struct hist_field *hist_field, |
203 | struct tracing_map_elt *elt, | |
204 | struct trace_buffer *buffer, | |
205 | struct ring_buffer_event *rbe, | |
206 | void *event); | |
69a0200c | 207 | |
52cfb373 KS |
208 | static u64 hist_field_const(struct hist_field *field, |
209 | struct tracing_map_elt *elt, | |
210 | struct trace_buffer *buffer, | |
211 | struct ring_buffer_event *rbe, | |
212 | void *event) | |
213 | { | |
214 | return field->constant; | |
215 | } | |
216 | ||
df35d93b TZ |
217 | static u64 hist_field_counter(struct hist_field *field, |
218 | struct tracing_map_elt *elt, | |
b47e3302 | 219 | struct trace_buffer *buffer, |
df35d93b TZ |
220 | struct ring_buffer_event *rbe, |
221 | void *event) | |
7ef224d1 TZ |
222 | { |
223 | return 1; | |
224 | } | |
225 | ||
df35d93b TZ |
226 | static u64 hist_field_string(struct hist_field *hist_field, |
227 | struct tracing_map_elt *elt, | |
b47e3302 | 228 | struct trace_buffer *buffer, |
df35d93b TZ |
229 | struct ring_buffer_event *rbe, |
230 | void *event) | |
7ef224d1 TZ |
231 | { |
232 | char *addr = (char *)(event + hist_field->field->offset); | |
233 | ||
234 | return (u64)(unsigned long)addr; | |
235 | } | |
236 | ||
df35d93b TZ |
237 | static u64 hist_field_dynstring(struct hist_field *hist_field, |
238 | struct tracing_map_elt *elt, | |
b47e3302 | 239 | struct trace_buffer *buffer, |
df35d93b TZ |
240 | struct ring_buffer_event *rbe, |
241 | void *event) | |
79e577cb NK |
242 | { |
243 | u32 str_item = *(u32 *)(event + hist_field->field->offset); | |
244 | int str_loc = str_item & 0xffff; | |
245 | char *addr = (char *)(event + str_loc); | |
246 | ||
247 | return (u64)(unsigned long)addr; | |
248 | } | |
249 | ||
05770dd0 MH |
250 | static u64 hist_field_reldynstring(struct hist_field *hist_field, |
251 | struct tracing_map_elt *elt, | |
252 | struct trace_buffer *buffer, | |
253 | struct ring_buffer_event *rbe, | |
254 | void *event) | |
255 | { | |
256 | u32 *item = event + hist_field->field->offset; | |
257 | u32 str_item = *item; | |
258 | int str_loc = str_item & 0xffff; | |
259 | char *addr = (char *)&item[1] + str_loc; | |
260 | ||
261 | return (u64)(unsigned long)addr; | |
262 | } | |
263 | ||
df35d93b TZ |
264 | static u64 hist_field_pstring(struct hist_field *hist_field, |
265 | struct tracing_map_elt *elt, | |
b47e3302 | 266 | struct trace_buffer *buffer, |
df35d93b TZ |
267 | struct ring_buffer_event *rbe, |
268 | void *event) | |
79e577cb NK |
269 | { |
270 | char **addr = (char **)(event + hist_field->field->offset); | |
271 | ||
272 | return (u64)(unsigned long)*addr; | |
273 | } | |
274 | ||
df35d93b TZ |
275 | static u64 hist_field_log2(struct hist_field *hist_field, |
276 | struct tracing_map_elt *elt, | |
b47e3302 | 277 | struct trace_buffer *buffer, |
df35d93b TZ |
278 | struct ring_buffer_event *rbe, |
279 | void *event) | |
4b94f5b7 | 280 | { |
5819eadd TZ |
281 | struct hist_field *operand = hist_field->operands[0]; |
282 | ||
86087383 | 283 | u64 val = hist_fn_call(operand, elt, buffer, rbe, event); |
4b94f5b7 NK |
284 | |
285 | return (u64) ilog2(roundup_pow_of_two(val)); | |
286 | } | |
287 | ||
de9a48a3 SRV |
288 | static u64 hist_field_bucket(struct hist_field *hist_field, |
289 | struct tracing_map_elt *elt, | |
290 | struct trace_buffer *buffer, | |
291 | struct ring_buffer_event *rbe, | |
292 | void *event) | |
293 | { | |
294 | struct hist_field *operand = hist_field->operands[0]; | |
295 | unsigned long buckets = hist_field->buckets; | |
296 | ||
86087383 | 297 | u64 val = hist_fn_call(operand, elt, buffer, rbe, event); |
de9a48a3 SRV |
298 | |
299 | if (WARN_ON_ONCE(!buckets)) | |
300 | return val; | |
301 | ||
302 | if (val >= LONG_MAX) | |
303 | val = div64_ul(val, buckets); | |
304 | else | |
305 | val = (u64)((unsigned long)val / buckets); | |
306 | return val * buckets; | |
307 | } | |
308 | ||
df35d93b TZ |
309 | static u64 hist_field_plus(struct hist_field *hist_field, |
310 | struct tracing_map_elt *elt, | |
b47e3302 | 311 | struct trace_buffer *buffer, |
df35d93b TZ |
312 | struct ring_buffer_event *rbe, |
313 | void *event) | |
100719dc TZ |
314 | { |
315 | struct hist_field *operand1 = hist_field->operands[0]; | |
316 | struct hist_field *operand2 = hist_field->operands[1]; | |
317 | ||
86087383 SRG |
318 | u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); |
319 | u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event); | |
100719dc TZ |
320 | |
321 | return val1 + val2; | |
322 | } | |
323 | ||
df35d93b TZ |
324 | static u64 hist_field_minus(struct hist_field *hist_field, |
325 | struct tracing_map_elt *elt, | |
b47e3302 | 326 | struct trace_buffer *buffer, |
df35d93b TZ |
327 | struct ring_buffer_event *rbe, |
328 | void *event) | |
100719dc TZ |
329 | { |
330 | struct hist_field *operand1 = hist_field->operands[0]; | |
331 | struct hist_field *operand2 = hist_field->operands[1]; | |
332 | ||
86087383 SRG |
333 | u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); |
334 | u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event); | |
100719dc TZ |
335 | |
336 | return val1 - val2; | |
337 | } | |
338 | ||
bcef0441 KS |
339 | static u64 hist_field_div(struct hist_field *hist_field, |
340 | struct tracing_map_elt *elt, | |
341 | struct trace_buffer *buffer, | |
342 | struct ring_buffer_event *rbe, | |
343 | void *event) | |
344 | { | |
345 | struct hist_field *operand1 = hist_field->operands[0]; | |
346 | struct hist_field *operand2 = hist_field->operands[1]; | |
347 | ||
86087383 SRG |
348 | u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); |
349 | u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event); | |
bcef0441 KS |
350 | |
351 | /* Return -1 for the undefined case */ | |
352 | if (!val2) | |
353 | return -1; | |
354 | ||
722eddaa KS |
355 | /* Use shift if the divisor is a power of 2 */ |
356 | if (!(val2 & (val2 - 1))) | |
357 | return val1 >> __ffs64(val2); | |
358 | ||
bcef0441 KS |
359 | return div64_u64(val1, val2); |
360 | } | |
361 | ||
8b5d46fd KS |
362 | static u64 div_by_power_of_two(struct hist_field *hist_field, |
363 | struct tracing_map_elt *elt, | |
364 | struct trace_buffer *buffer, | |
365 | struct ring_buffer_event *rbe, | |
366 | void *event) | |
367 | { | |
368 | struct hist_field *operand1 = hist_field->operands[0]; | |
369 | struct hist_field *operand2 = hist_field->operands[1]; | |
370 | ||
86087383 | 371 | u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); |
8b5d46fd KS |
372 | |
373 | return val1 >> __ffs64(operand2->constant); | |
374 | } | |
375 | ||
376 | static u64 div_by_not_power_of_two(struct hist_field *hist_field, | |
377 | struct tracing_map_elt *elt, | |
378 | struct trace_buffer *buffer, | |
379 | struct ring_buffer_event *rbe, | |
380 | void *event) | |
381 | { | |
382 | struct hist_field *operand1 = hist_field->operands[0]; | |
383 | struct hist_field *operand2 = hist_field->operands[1]; | |
384 | ||
86087383 | 385 | u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); |
8b5d46fd KS |
386 | |
387 | return div64_u64(val1, operand2->constant); | |
388 | } | |
389 | ||
390 | static u64 div_by_mult_and_shift(struct hist_field *hist_field, | |
391 | struct tracing_map_elt *elt, | |
392 | struct trace_buffer *buffer, | |
393 | struct ring_buffer_event *rbe, | |
394 | void *event) | |
395 | { | |
396 | struct hist_field *operand1 = hist_field->operands[0]; | |
397 | struct hist_field *operand2 = hist_field->operands[1]; | |
398 | ||
86087383 | 399 | u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); |
8b5d46fd KS |
400 | |
401 | /* | |
402 | * If the divisor is a constant, do a multiplication and shift instead. | |
403 | * | |
404 | * Choose Z = some power of 2. If Y <= Z, then: | |
405 | * X / Y = (X * (Z / Y)) / Z | |
406 | * | |
407 | * (Z / Y) is a constant (mult) which is calculated at parse time, so: | |
408 | * X / Y = (X * mult) / Z | |
409 | * | |
410 | * The division by Z can be replaced by a shift since Z is a power of 2: | |
411 | * X / Y = (X * mult) >> HIST_DIV_SHIFT | |
412 | * | |
413 | * As long, as X < Z the results will not be off by more than 1. | |
414 | */ | |
415 | if (val1 < (1 << HIST_DIV_SHIFT)) { | |
416 | u64 mult = operand2->div_multiplier; | |
417 | ||
418 | return (val1 * mult + ((1 << HIST_DIV_SHIFT) - 1)) >> HIST_DIV_SHIFT; | |
419 | } | |
420 | ||
421 | return div64_u64(val1, operand2->constant); | |
422 | } | |
423 | ||
bcef0441 KS |
424 | static u64 hist_field_mult(struct hist_field *hist_field, |
425 | struct tracing_map_elt *elt, | |
426 | struct trace_buffer *buffer, | |
427 | struct ring_buffer_event *rbe, | |
428 | void *event) | |
429 | { | |
430 | struct hist_field *operand1 = hist_field->operands[0]; | |
431 | struct hist_field *operand2 = hist_field->operands[1]; | |
432 | ||
86087383 SRG |
433 | u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); |
434 | u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event); | |
bcef0441 KS |
435 | |
436 | return val1 * val2; | |
437 | } | |
438 | ||
df35d93b TZ |
439 | static u64 hist_field_unary_minus(struct hist_field *hist_field, |
440 | struct tracing_map_elt *elt, | |
b47e3302 | 441 | struct trace_buffer *buffer, |
df35d93b TZ |
442 | struct ring_buffer_event *rbe, |
443 | void *event) | |
100719dc TZ |
444 | { |
445 | struct hist_field *operand = hist_field->operands[0]; | |
446 | ||
86087383 | 447 | s64 sval = (s64)hist_fn_call(operand, elt, buffer, rbe, event); |
100719dc TZ |
448 | u64 val = (u64)-sval; |
449 | ||
450 | return val; | |
451 | } | |
452 | ||
7ef224d1 | 453 | #define DEFINE_HIST_FIELD_FN(type) \ |
fbd302cb | 454 | static u64 hist_field_##type(struct hist_field *hist_field, \ |
df35d93b | 455 | struct tracing_map_elt *elt, \ |
b47e3302 | 456 | struct trace_buffer *buffer, \ |
df35d93b TZ |
457 | struct ring_buffer_event *rbe, \ |
458 | void *event) \ | |
7ef224d1 TZ |
459 | { \ |
460 | type *addr = (type *)(event + hist_field->field->offset); \ | |
461 | \ | |
79e577cb | 462 | return (u64)(unsigned long)*addr; \ |
7ef224d1 TZ |
463 | } |
464 | ||
465 | DEFINE_HIST_FIELD_FN(s64); | |
466 | DEFINE_HIST_FIELD_FN(u64); | |
467 | DEFINE_HIST_FIELD_FN(s32); | |
468 | DEFINE_HIST_FIELD_FN(u32); | |
469 | DEFINE_HIST_FIELD_FN(s16); | |
470 | DEFINE_HIST_FIELD_FN(u16); | |
471 | DEFINE_HIST_FIELD_FN(s8); | |
472 | DEFINE_HIST_FIELD_FN(u8); | |
473 | ||
474 | #define for_each_hist_field(i, hist_data) \ | |
475 | for ((i) = 0; (i) < (hist_data)->n_fields; (i)++) | |
476 | ||
477 | #define for_each_hist_val_field(i, hist_data) \ | |
478 | for ((i) = 0; (i) < (hist_data)->n_vals; (i)++) | |
479 | ||
480 | #define for_each_hist_key_field(i, hist_data) \ | |
481 | for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++) | |
482 | ||
69a0200c TZ |
483 | #define HIST_STACKTRACE_DEPTH 16 |
484 | #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long)) | |
485 | #define HIST_STACKTRACE_SKIP 5 | |
486 | ||
7ef224d1 | 487 | #define HITCOUNT_IDX 0 |
69a0200c | 488 | #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE) |
7ef224d1 TZ |
489 | |
490 | enum hist_field_flags { | |
0d7a8325 TZ |
491 | HIST_FIELD_FL_HITCOUNT = 1 << 0, |
492 | HIST_FIELD_FL_KEY = 1 << 1, | |
493 | HIST_FIELD_FL_STRING = 1 << 2, | |
494 | HIST_FIELD_FL_HEX = 1 << 3, | |
495 | HIST_FIELD_FL_SYM = 1 << 4, | |
496 | HIST_FIELD_FL_SYM_OFFSET = 1 << 5, | |
497 | HIST_FIELD_FL_EXECNAME = 1 << 6, | |
498 | HIST_FIELD_FL_SYSCALL = 1 << 7, | |
499 | HIST_FIELD_FL_STACKTRACE = 1 << 8, | |
500 | HIST_FIELD_FL_LOG2 = 1 << 9, | |
ad42febe | 501 | HIST_FIELD_FL_TIMESTAMP = 1 << 10, |
860f9f6b | 502 | HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11, |
30350d65 | 503 | HIST_FIELD_FL_VAR = 1 << 12, |
100719dc | 504 | HIST_FIELD_FL_EXPR = 1 << 13, |
067fe038 | 505 | HIST_FIELD_FL_VAR_REF = 1 << 14, |
8b7622bf | 506 | HIST_FIELD_FL_CPU = 1 << 15, |
7e8b88a3 | 507 | HIST_FIELD_FL_ALIAS = 1 << 16, |
de9a48a3 | 508 | HIST_FIELD_FL_BUCKET = 1 << 17, |
52cfb373 | 509 | HIST_FIELD_FL_CONST = 1 << 18, |
abaa5258 | 510 | HIST_FIELD_FL_PERCENT = 1 << 19, |
a2c54256 | 511 | HIST_FIELD_FL_GRAPH = 1 << 20, |
30350d65 TZ |
512 | }; |
513 | ||
514 | struct var_defs { | |
515 | unsigned int n_vars; | |
516 | char *name[TRACING_MAP_VARS_MAX]; | |
517 | char *expr[TRACING_MAP_VARS_MAX]; | |
7ef224d1 TZ |
518 | }; |
519 | ||
520 | struct hist_trigger_attrs { | |
521 | char *keys_str; | |
f2606835 | 522 | char *vals_str; |
e62347d2 | 523 | char *sort_key_str; |
5463bfda | 524 | char *name; |
a4072fe8 | 525 | char *clock; |
83e99914 TZ |
526 | bool pause; |
527 | bool cont; | |
e86ae9ba | 528 | bool clear; |
860f9f6b | 529 | bool ts_in_usecs; |
ccf47f5c | 530 | bool no_hitcount; |
7ef224d1 | 531 | unsigned int map_bits; |
30350d65 TZ |
532 | |
533 | char *assignment_str[TRACING_MAP_VARS_MAX]; | |
534 | unsigned int n_assignments; | |
535 | ||
0212e2aa TZ |
536 | char *action_str[HIST_ACTIONS_MAX]; |
537 | unsigned int n_actions; | |
538 | ||
30350d65 | 539 | struct var_defs var_defs; |
7ef224d1 TZ |
540 | }; |
541 | ||
02205a67 TZ |
542 | struct field_var { |
543 | struct hist_field *var; | |
544 | struct hist_field *val; | |
545 | }; | |
546 | ||
547 | struct field_var_hist { | |
548 | struct hist_trigger_data *hist_data; | |
549 | char *cmd; | |
550 | }; | |
551 | ||
7ef224d1 | 552 | struct hist_trigger_data { |
30350d65 | 553 | struct hist_field *fields[HIST_FIELDS_MAX]; |
7ef224d1 TZ |
554 | unsigned int n_vals; |
555 | unsigned int n_keys; | |
556 | unsigned int n_fields; | |
30350d65 | 557 | unsigned int n_vars; |
63a1e5de | 558 | unsigned int n_var_str; |
7ef224d1 TZ |
559 | unsigned int key_size; |
560 | struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX]; | |
561 | unsigned int n_sort_keys; | |
562 | struct trace_event_file *event_file; | |
563 | struct hist_trigger_attrs *attrs; | |
564 | struct tracing_map *map; | |
ad42febe | 565 | bool enable_timestamps; |
30350d65 | 566 | bool remove; |
067fe038 TZ |
567 | struct hist_field *var_refs[TRACING_MAP_VARS_MAX]; |
568 | unsigned int n_var_refs; | |
0212e2aa TZ |
569 | |
570 | struct action_data *actions[HIST_ACTIONS_MAX]; | |
571 | unsigned int n_actions; | |
02205a67 TZ |
572 | |
573 | struct field_var *field_vars[SYNTH_FIELDS_MAX]; | |
574 | unsigned int n_field_vars; | |
575 | unsigned int n_field_var_str; | |
576 | struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX]; | |
577 | unsigned int n_field_var_hists; | |
50450603 | 578 | |
7d18a10c TZ |
579 | struct field_var *save_vars[SYNTH_FIELDS_MAX]; |
580 | unsigned int n_save_vars; | |
581 | unsigned int n_save_var_str; | |
0212e2aa TZ |
582 | }; |
583 | ||
584 | struct action_data; | |
585 | ||
586 | typedef void (*action_fn_t) (struct hist_trigger_data *hist_data, | |
b47e3302 SRV |
587 | struct tracing_map_elt *elt, |
588 | struct trace_buffer *buffer, void *rec, | |
7d18a10c | 589 | struct ring_buffer_event *rbe, void *key, |
0212e2aa TZ |
590 | struct action_data *data, u64 *var_ref_vals); |
591 | ||
466f4528 TZ |
592 | typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val); |
593 | ||
7d18a10c TZ |
594 | enum handler_id { |
595 | HANDLER_ONMATCH = 1, | |
596 | HANDLER_ONMAX, | |
dff81f55 | 597 | HANDLER_ONCHANGE, |
7d18a10c TZ |
598 | }; |
599 | ||
600 | enum action_id { | |
601 | ACTION_SAVE = 1, | |
602 | ACTION_TRACE, | |
a3785b7e | 603 | ACTION_SNAPSHOT, |
7d18a10c TZ |
604 | }; |
605 | ||
0212e2aa | 606 | struct action_data { |
7d18a10c TZ |
607 | enum handler_id handler; |
608 | enum action_id action; | |
609 | char *action_name; | |
0212e2aa | 610 | action_fn_t fn; |
7d18a10c | 611 | |
c282a386 TZ |
612 | unsigned int n_params; |
613 | char *params[SYNTH_FIELDS_MAX]; | |
614 | ||
c3e49506 TZ |
615 | /* |
616 | * When a histogram trigger is hit, the values of any | |
617 | * references to variables, including variables being passed | |
618 | * as parameters to synthetic events, are collected into a | |
d380dcde TZ |
619 | * var_ref_vals array. This var_ref_idx array is an array of |
620 | * indices into the var_ref_vals array, one for each synthetic | |
621 | * event param, and is passed to the synthetic event | |
622 | * invocation. | |
c3e49506 | 623 | */ |
82470f7d | 624 | unsigned int var_ref_idx[SYNTH_FIELDS_MAX]; |
c3e49506 | 625 | struct synth_event *synth_event; |
e91eefd7 TZ |
626 | bool use_trace_keyword; |
627 | char *synth_event_name; | |
c3e49506 | 628 | |
c282a386 TZ |
629 | union { |
630 | struct { | |
c3e49506 | 631 | char *event; |
726721a5 TZ |
632 | char *event_system; |
633 | } match_data; | |
8dcc53ad | 634 | |
726721a5 TZ |
635 | struct { |
636 | /* | |
637 | * var_str contains the $-unstripped variable | |
638 | * name referenced by var_ref, and used when | |
639 | * printing the action. Because var_ref | |
640 | * creation is deferred to create_actions(), | |
641 | * we need a per-action way to save it until | |
642 | * then, thus var_str. | |
643 | */ | |
644 | char *var_str; | |
8dcc53ad | 645 | |
726721a5 TZ |
646 | /* |
647 | * var_ref refers to the variable being | |
648 | * tracked e.g onmax($var). | |
649 | */ | |
650 | struct hist_field *var_ref; | |
249d7b2e | 651 | |
726721a5 TZ |
652 | /* |
653 | * track_var contains the 'invisible' tracking | |
654 | * variable created to keep the current | |
655 | * e.g. max value. | |
656 | */ | |
657 | struct hist_field *track_var; | |
249d7b2e | 658 | |
726721a5 TZ |
659 | check_track_val_fn_t check_val; |
660 | action_fn_t save_data; | |
661 | } track_data; | |
662 | }; | |
663 | }; | |
8dcc53ad | 664 | |
726721a5 TZ |
665 | struct track_data { |
666 | u64 track_val; | |
667 | bool updated; | |
249d7b2e | 668 | |
726721a5 TZ |
669 | unsigned int key_len; |
670 | void *key; | |
671 | struct tracing_map_elt elt; | |
249d7b2e | 672 | |
726721a5 TZ |
673 | struct action_data *action_data; |
674 | struct hist_trigger_data *hist_data; | |
675 | }; | |
8dcc53ad | 676 | |
726721a5 TZ |
677 | struct hist_elt_data { |
678 | char *comm; | |
679 | u64 *var_ref_vals; | |
c910db94 TZ |
680 | char **field_var_str; |
681 | int n_field_var_str; | |
726721a5 | 682 | }; |
8dcc53ad | 683 | |
726721a5 TZ |
684 | struct snapshot_context { |
685 | struct tracing_map_elt *elt; | |
686 | void *key; | |
687 | }; | |
1d9d4c90 | 688 | |
8b5d46fd KS |
689 | /* |
690 | * Returns the specific division function to use if the divisor | |
691 | * is constant. This avoids extra branches when the trigger is hit. | |
692 | */ | |
86087383 | 693 | static enum hist_field_fn hist_field_get_div_fn(struct hist_field *divisor) |
8b5d46fd KS |
694 | { |
695 | u64 div = divisor->constant; | |
696 | ||
697 | if (!(div & (div - 1))) | |
86087383 | 698 | return HIST_FIELD_FN_DIV_POWER2; |
8b5d46fd KS |
699 | |
700 | /* If the divisor is too large, do a regular division */ | |
701 | if (div > (1 << HIST_DIV_SHIFT)) | |
86087383 | 702 | return HIST_FIELD_FN_DIV_NOT_POWER2; |
8b5d46fd KS |
703 | |
704 | divisor->div_multiplier = div64_u64((u64)(1 << HIST_DIV_SHIFT), div); | |
86087383 | 705 | return HIST_FIELD_FN_DIV_MULT_SHIFT; |
8b5d46fd KS |
706 | } |
707 | ||
726721a5 TZ |
708 | static void track_data_free(struct track_data *track_data) |
709 | { | |
710 | struct hist_elt_data *elt_data; | |
1d9d4c90 | 711 | |
726721a5 TZ |
712 | if (!track_data) |
713 | return; | |
1d9d4c90 | 714 | |
726721a5 TZ |
715 | kfree(track_data->key); |
716 | ||
717 | elt_data = track_data->elt.private_data; | |
718 | if (elt_data) { | |
719 | kfree(elt_data->comm); | |
720 | kfree(elt_data); | |
1d9d4c90 | 721 | } |
8dcc53ad | 722 | |
726721a5 | 723 | kfree(track_data); |
8dcc53ad | 724 | } |
8dcc53ad | 725 | |
726721a5 TZ |
726 | static struct track_data *track_data_alloc(unsigned int key_len, |
727 | struct action_data *action_data, | |
728 | struct hist_trigger_data *hist_data) | |
8dcc53ad | 729 | { |
726721a5 TZ |
730 | struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL); |
731 | struct hist_elt_data *elt_data; | |
8dcc53ad | 732 | |
726721a5 TZ |
733 | if (!data) |
734 | return ERR_PTR(-ENOMEM); | |
8dcc53ad | 735 | |
726721a5 TZ |
736 | data->key = kzalloc(key_len, GFP_KERNEL); |
737 | if (!data->key) { | |
738 | track_data_free(data); | |
739 | return ERR_PTR(-ENOMEM); | |
740 | } | |
8dcc53ad | 741 | |
726721a5 TZ |
742 | data->key_len = key_len; |
743 | data->action_data = action_data; | |
744 | data->hist_data = hist_data; | |
8dcc53ad | 745 | |
726721a5 TZ |
746 | elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL); |
747 | if (!elt_data) { | |
748 | track_data_free(data); | |
749 | return ERR_PTR(-ENOMEM); | |
750 | } | |
4b147936 | 751 | |
726721a5 | 752 | data->elt.private_data = elt_data; |
4b147936 | 753 | |
726721a5 TZ |
754 | elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL); |
755 | if (!elt_data->comm) { | |
756 | track_data_free(data); | |
757 | return ERR_PTR(-ENOMEM); | |
7bbab38d | 758 | } |
7bbab38d | 759 | |
726721a5 TZ |
760 | return data; |
761 | } | |
7bbab38d | 762 | |
edfeed31 TZ |
763 | #define HIST_PREFIX "hist:" |
764 | ||
765 | static char *last_cmd; | |
726721a5 | 766 | static char last_cmd_loc[MAX_FILTER_STR_VAL]; |
7bbab38d | 767 | |
726721a5 TZ |
768 | static int errpos(char *str) |
769 | { | |
edfeed31 TZ |
770 | if (!str || !last_cmd) |
771 | return 0; | |
772 | ||
726721a5 | 773 | return err_pos(last_cmd, str); |
4b147936 TZ |
774 | } |
775 | ||
726721a5 | 776 | static void last_cmd_set(struct trace_event_file *file, char *str) |
4b147936 | 777 | { |
726721a5 TZ |
778 | const char *system = NULL, *name = NULL; |
779 | struct trace_event_call *call; | |
9f8e5aee | 780 | int len; |
4b147936 | 781 | |
726721a5 TZ |
782 | if (!str) |
783 | return; | |
4b147936 | 784 | |
5677a3d7 SRG |
785 | /* sizeof() contains the nul byte */ |
786 | len = sizeof(HIST_PREFIX) + strlen(str); | |
edfeed31 TZ |
787 | kfree(last_cmd); |
788 | last_cmd = kzalloc(len, GFP_KERNEL); | |
789 | if (!last_cmd) | |
790 | return; | |
791 | ||
792 | strcpy(last_cmd, HIST_PREFIX); | |
5677a3d7 SRG |
793 | /* Again, sizeof() contains the nul byte */ |
794 | len -= sizeof(HIST_PREFIX); | |
9f8e5aee | 795 | strncat(last_cmd, str, len); |
4b147936 | 796 | |
726721a5 TZ |
797 | if (file) { |
798 | call = file->event_call; | |
799 | system = call->class->system; | |
800 | if (system) { | |
801 | name = trace_event_name(call); | |
802 | if (!name) | |
803 | system = NULL; | |
804 | } | |
4b147936 TZ |
805 | } |
806 | ||
726721a5 | 807 | if (system) |
edfeed31 | 808 | snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, HIST_PREFIX "%s:%s", system, name); |
4b147936 TZ |
809 | } |
810 | ||
edfeed31 | 811 | static void hist_err(struct trace_array *tr, u8 err_type, u16 err_pos) |
7bbab38d | 812 | { |
edfeed31 TZ |
813 | if (!last_cmd) |
814 | return; | |
815 | ||
726721a5 TZ |
816 | tracing_log_err(tr, last_cmd_loc, last_cmd, err_text, |
817 | err_type, err_pos); | |
7bbab38d MH |
818 | } |
819 | ||
726721a5 | 820 | static void hist_err_clear(void) |
7bbab38d | 821 | { |
edfeed31 TZ |
822 | if (last_cmd) |
823 | last_cmd[0] = '\0'; | |
726721a5 | 824 | last_cmd_loc[0] = '\0'; |
7bbab38d MH |
825 | } |
826 | ||
726721a5 TZ |
827 | typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals, |
828 | unsigned int *var_ref_idx); | |
4b147936 | 829 | |
726721a5 TZ |
830 | static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals, |
831 | unsigned int *var_ref_idx) | |
4b147936 | 832 | { |
726721a5 | 833 | struct tracepoint *tp = event->tp; |
4b147936 | 834 | |
726721a5 TZ |
835 | if (unlikely(atomic_read(&tp->key.enabled) > 0)) { |
836 | struct tracepoint_func *probe_func_ptr; | |
837 | synth_probe_func_t probe_func; | |
838 | void *__data; | |
17911ff3 | 839 | |
726721a5 TZ |
840 | if (!(cpu_online(raw_smp_processor_id()))) |
841 | return; | |
4b147936 | 842 | |
726721a5 TZ |
843 | probe_func_ptr = rcu_dereference_sched((tp)->funcs); |
844 | if (probe_func_ptr) { | |
845 | do { | |
846 | probe_func = probe_func_ptr->func; | |
847 | __data = probe_func_ptr->data; | |
848 | probe_func(__data, var_ref_vals, var_ref_idx); | |
849 | } while ((++probe_func_ptr)->func); | |
850 | } | |
851 | } | |
4b147936 TZ |
852 | } |
853 | ||
726721a5 | 854 | static void action_trace(struct hist_trigger_data *hist_data, |
b47e3302 SRV |
855 | struct tracing_map_elt *elt, |
856 | struct trace_buffer *buffer, void *rec, | |
726721a5 TZ |
857 | struct ring_buffer_event *rbe, void *key, |
858 | struct action_data *data, u64 *var_ref_vals) | |
4b147936 | 859 | { |
726721a5 TZ |
860 | struct synth_event *event = data->synth_event; |
861 | ||
862 | trace_synth(event, var_ref_vals, data->var_ref_idx); | |
4b147936 TZ |
863 | } |
864 | ||
726721a5 TZ |
865 | struct hist_var_data { |
866 | struct list_head list; | |
867 | struct hist_trigger_data *hist_data; | |
4b147936 TZ |
868 | }; |
869 | ||
df35d93b TZ |
870 | static u64 hist_field_timestamp(struct hist_field *hist_field, |
871 | struct tracing_map_elt *elt, | |
b47e3302 | 872 | struct trace_buffer *buffer, |
df35d93b TZ |
873 | struct ring_buffer_event *rbe, |
874 | void *event) | |
860f9f6b TZ |
875 | { |
876 | struct hist_trigger_data *hist_data = hist_field->hist_data; | |
877 | struct trace_array *tr = hist_data->event_file->tr; | |
878 | ||
efe6196a | 879 | u64 ts = ring_buffer_event_time_stamp(buffer, rbe); |
860f9f6b TZ |
880 | |
881 | if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr)) | |
882 | ts = ns2usecs(ts); | |
883 | ||
884 | return ts; | |
885 | } | |
886 | ||
8b7622bf TZ |
887 | static u64 hist_field_cpu(struct hist_field *hist_field, |
888 | struct tracing_map_elt *elt, | |
b47e3302 | 889 | struct trace_buffer *buffer, |
8b7622bf TZ |
890 | struct ring_buffer_event *rbe, |
891 | void *event) | |
892 | { | |
893 | int cpu = smp_processor_id(); | |
894 | ||
895 | return cpu; | |
896 | } | |
897 | ||
de40f033 TZ |
898 | /** |
899 | * check_field_for_var_ref - Check if a VAR_REF field references a variable | |
900 | * @hist_field: The VAR_REF field to check | |
901 | * @var_data: The hist trigger that owns the variable | |
902 | * @var_idx: The trigger variable identifier | |
903 | * | |
904 | * Check the given VAR_REF field to see whether or not it references | |
905 | * the given variable associated with the given trigger. | |
906 | * | |
907 | * Return: The VAR_REF field if it does reference the variable, NULL if not | |
908 | */ | |
067fe038 TZ |
909 | static struct hist_field * |
910 | check_field_for_var_ref(struct hist_field *hist_field, | |
911 | struct hist_trigger_data *var_data, | |
912 | unsigned int var_idx) | |
913 | { | |
e4f6d245 | 914 | WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF)); |
067fe038 | 915 | |
e4f6d245 TZ |
916 | if (hist_field && hist_field->var.idx == var_idx && |
917 | hist_field->var.hist_data == var_data) | |
918 | return hist_field; | |
067fe038 | 919 | |
e4f6d245 | 920 | return NULL; |
067fe038 TZ |
921 | } |
922 | ||
de40f033 TZ |
923 | /** |
924 | * find_var_ref - Check if a trigger has a reference to a trigger variable | |
925 | * @hist_data: The hist trigger that might have a reference to the variable | |
926 | * @var_data: The hist trigger that owns the variable | |
927 | * @var_idx: The trigger variable identifier | |
928 | * | |
929 | * Check the list of var_refs[] on the first hist trigger to see | |
930 | * whether any of them are references to the variable on the second | |
931 | * trigger. | |
932 | * | |
933 | * Return: The VAR_REF field referencing the variable if so, NULL if not | |
934 | */ | |
067fe038 TZ |
935 | static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data, |
936 | struct hist_trigger_data *var_data, | |
937 | unsigned int var_idx) | |
938 | { | |
e4f6d245 | 939 | struct hist_field *hist_field; |
067fe038 TZ |
940 | unsigned int i; |
941 | ||
e4f6d245 TZ |
942 | for (i = 0; i < hist_data->n_var_refs; i++) { |
943 | hist_field = hist_data->var_refs[i]; | |
944 | if (check_field_for_var_ref(hist_field, var_data, var_idx)) | |
945 | return hist_field; | |
067fe038 TZ |
946 | } |
947 | ||
e4f6d245 | 948 | return NULL; |
067fe038 TZ |
949 | } |
950 | ||
de40f033 TZ |
951 | /** |
952 | * find_any_var_ref - Check if there is a reference to a given trigger variable | |
953 | * @hist_data: The hist trigger | |
954 | * @var_idx: The trigger variable identifier | |
955 | * | |
956 | * Check to see whether the given variable is currently referenced by | |
957 | * any other trigger. | |
958 | * | |
959 | * The trigger the variable is defined on is explicitly excluded - the | |
960 | * assumption being that a self-reference doesn't prevent a trigger | |
961 | * from being removed. | |
962 | * | |
963 | * Return: The VAR_REF field referencing the variable if so, NULL if not | |
964 | */ | |
067fe038 TZ |
965 | static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data, |
966 | unsigned int var_idx) | |
967 | { | |
968 | struct trace_array *tr = hist_data->event_file->tr; | |
969 | struct hist_field *found = NULL; | |
970 | struct hist_var_data *var_data; | |
971 | ||
972 | list_for_each_entry(var_data, &tr->hist_vars, list) { | |
973 | if (var_data->hist_data == hist_data) | |
974 | continue; | |
975 | found = find_var_ref(var_data->hist_data, hist_data, var_idx); | |
976 | if (found) | |
977 | break; | |
978 | } | |
979 | ||
980 | return found; | |
981 | } | |
982 | ||
de40f033 TZ |
983 | /** |
984 | * check_var_refs - Check if there is a reference to any of trigger's variables | |
985 | * @hist_data: The hist trigger | |
986 | * | |
987 | * A trigger can define one or more variables. If any one of them is | |
988 | * currently referenced by any other trigger, this function will | |
989 | * determine that. | |
0a068f4a | 990 | * |
de40f033 TZ |
991 | * Typically used to determine whether or not a trigger can be removed |
992 | * - if there are any references to a trigger's variables, it cannot. | |
993 | * | |
994 | * Return: True if there is a reference to any of trigger's variables | |
995 | */ | |
067fe038 TZ |
996 | static bool check_var_refs(struct hist_trigger_data *hist_data) |
997 | { | |
998 | struct hist_field *field; | |
999 | bool found = false; | |
1000 | int i; | |
1001 | ||
1002 | for_each_hist_field(i, hist_data) { | |
1003 | field = hist_data->fields[i]; | |
1004 | if (field && field->flags & HIST_FIELD_FL_VAR) { | |
1005 | if (find_any_var_ref(hist_data, field->var.idx)) { | |
1006 | found = true; | |
1007 | break; | |
1008 | } | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | return found; | |
1013 | } | |
1014 | ||
1015 | static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data) | |
1016 | { | |
1017 | struct trace_array *tr = hist_data->event_file->tr; | |
1018 | struct hist_var_data *var_data, *found = NULL; | |
1019 | ||
1020 | list_for_each_entry(var_data, &tr->hist_vars, list) { | |
1021 | if (var_data->hist_data == hist_data) { | |
1022 | found = var_data; | |
1023 | break; | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | return found; | |
1028 | } | |
1029 | ||
1030 | static bool field_has_hist_vars(struct hist_field *hist_field, | |
1031 | unsigned int level) | |
1032 | { | |
1033 | int i; | |
1034 | ||
1035 | if (level > 3) | |
1036 | return false; | |
1037 | ||
1038 | if (!hist_field) | |
1039 | return false; | |
1040 | ||
1041 | if (hist_field->flags & HIST_FIELD_FL_VAR || | |
1042 | hist_field->flags & HIST_FIELD_FL_VAR_REF) | |
1043 | return true; | |
1044 | ||
1045 | for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) { | |
1046 | struct hist_field *operand; | |
1047 | ||
1048 | operand = hist_field->operands[i]; | |
1049 | if (field_has_hist_vars(operand, level + 1)) | |
1050 | return true; | |
1051 | } | |
1052 | ||
1053 | return false; | |
1054 | } | |
1055 | ||
1056 | static bool has_hist_vars(struct hist_trigger_data *hist_data) | |
1057 | { | |
1058 | struct hist_field *hist_field; | |
1059 | int i; | |
1060 | ||
1061 | for_each_hist_field(i, hist_data) { | |
1062 | hist_field = hist_data->fields[i]; | |
1063 | if (field_has_hist_vars(hist_field, 0)) | |
1064 | return true; | |
1065 | } | |
1066 | ||
1067 | return false; | |
1068 | } | |
1069 | ||
1070 | static int save_hist_vars(struct hist_trigger_data *hist_data) | |
1071 | { | |
1072 | struct trace_array *tr = hist_data->event_file->tr; | |
1073 | struct hist_var_data *var_data; | |
1074 | ||
1075 | var_data = find_hist_vars(hist_data); | |
1076 | if (var_data) | |
1077 | return 0; | |
1078 | ||
8530dec6 | 1079 | if (tracing_check_open_get_tr(tr)) |
067fe038 TZ |
1080 | return -ENODEV; |
1081 | ||
1082 | var_data = kzalloc(sizeof(*var_data), GFP_KERNEL); | |
1083 | if (!var_data) { | |
1084 | trace_array_put(tr); | |
1085 | return -ENOMEM; | |
1086 | } | |
1087 | ||
1088 | var_data->hist_data = hist_data; | |
1089 | list_add(&var_data->list, &tr->hist_vars); | |
1090 | ||
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | static void remove_hist_vars(struct hist_trigger_data *hist_data) | |
1095 | { | |
1096 | struct trace_array *tr = hist_data->event_file->tr; | |
1097 | struct hist_var_data *var_data; | |
1098 | ||
1099 | var_data = find_hist_vars(hist_data); | |
1100 | if (!var_data) | |
1101 | return; | |
1102 | ||
1103 | if (WARN_ON(check_var_refs(hist_data))) | |
1104 | return; | |
1105 | ||
1106 | list_del(&var_data->list); | |
1107 | ||
1108 | kfree(var_data); | |
1109 | ||
1110 | trace_array_put(tr); | |
1111 | } | |
1112 | ||
30350d65 TZ |
1113 | static struct hist_field *find_var_field(struct hist_trigger_data *hist_data, |
1114 | const char *var_name) | |
1115 | { | |
1116 | struct hist_field *hist_field, *found = NULL; | |
1117 | int i; | |
1118 | ||
1119 | for_each_hist_field(i, hist_data) { | |
1120 | hist_field = hist_data->fields[i]; | |
1121 | if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR && | |
1122 | strcmp(hist_field->var.name, var_name) == 0) { | |
1123 | found = hist_field; | |
1124 | break; | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | return found; | |
1129 | } | |
1130 | ||
1131 | static struct hist_field *find_var(struct hist_trigger_data *hist_data, | |
1132 | struct trace_event_file *file, | |
1133 | const char *var_name) | |
1134 | { | |
1135 | struct hist_trigger_data *test_data; | |
1136 | struct event_trigger_data *test; | |
1137 | struct hist_field *hist_field; | |
1138 | ||
aeed8aa3 MH |
1139 | lockdep_assert_held(&event_mutex); |
1140 | ||
30350d65 TZ |
1141 | hist_field = find_var_field(hist_data, var_name); |
1142 | if (hist_field) | |
1143 | return hist_field; | |
1144 | ||
aeed8aa3 | 1145 | list_for_each_entry(test, &file->triggers, list) { |
30350d65 TZ |
1146 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
1147 | test_data = test->private_data; | |
1148 | hist_field = find_var_field(test_data, var_name); | |
1149 | if (hist_field) | |
1150 | return hist_field; | |
1151 | } | |
1152 | } | |
1153 | ||
1154 | return NULL; | |
1155 | } | |
1156 | ||
067fe038 TZ |
1157 | static struct trace_event_file *find_var_file(struct trace_array *tr, |
1158 | char *system, | |
1159 | char *event_name, | |
1160 | char *var_name) | |
1161 | { | |
1162 | struct hist_trigger_data *var_hist_data; | |
1163 | struct hist_var_data *var_data; | |
1164 | struct trace_event_file *file, *found = NULL; | |
1165 | ||
1166 | if (system) | |
1167 | return find_event_file(tr, system, event_name); | |
1168 | ||
1169 | list_for_each_entry(var_data, &tr->hist_vars, list) { | |
1170 | var_hist_data = var_data->hist_data; | |
1171 | file = var_hist_data->event_file; | |
1172 | if (file == found) | |
1173 | continue; | |
1174 | ||
1175 | if (find_var_field(var_hist_data, var_name)) { | |
f404da6e | 1176 | if (found) { |
d0cd871b | 1177 | hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name)); |
067fe038 | 1178 | return NULL; |
f404da6e | 1179 | } |
067fe038 TZ |
1180 | |
1181 | found = file; | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | return found; | |
1186 | } | |
1187 | ||
1188 | static struct hist_field *find_file_var(struct trace_event_file *file, | |
1189 | const char *var_name) | |
1190 | { | |
1191 | struct hist_trigger_data *test_data; | |
1192 | struct event_trigger_data *test; | |
1193 | struct hist_field *hist_field; | |
1194 | ||
aeed8aa3 MH |
1195 | lockdep_assert_held(&event_mutex); |
1196 | ||
1197 | list_for_each_entry(test, &file->triggers, list) { | |
067fe038 TZ |
1198 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
1199 | test_data = test->private_data; | |
1200 | hist_field = find_var_field(test_data, var_name); | |
1201 | if (hist_field) | |
1202 | return hist_field; | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | return NULL; | |
1207 | } | |
1208 | ||
c282a386 TZ |
1209 | static struct hist_field * |
1210 | find_match_var(struct hist_trigger_data *hist_data, char *var_name) | |
1211 | { | |
1212 | struct trace_array *tr = hist_data->event_file->tr; | |
1213 | struct hist_field *hist_field, *found = NULL; | |
1214 | struct trace_event_file *file; | |
1215 | unsigned int i; | |
1216 | ||
1217 | for (i = 0; i < hist_data->n_actions; i++) { | |
1218 | struct action_data *data = hist_data->actions[i]; | |
1219 | ||
7d18a10c | 1220 | if (data->handler == HANDLER_ONMATCH) { |
c3e49506 TZ |
1221 | char *system = data->match_data.event_system; |
1222 | char *event_name = data->match_data.event; | |
c282a386 TZ |
1223 | |
1224 | file = find_var_file(tr, system, event_name, var_name); | |
1225 | if (!file) | |
1226 | continue; | |
1227 | hist_field = find_file_var(file, var_name); | |
1228 | if (hist_field) { | |
1229 | if (found) { | |
d0cd871b SRV |
1230 | hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, |
1231 | errpos(var_name)); | |
c282a386 TZ |
1232 | return ERR_PTR(-EINVAL); |
1233 | } | |
1234 | ||
1235 | found = hist_field; | |
1236 | } | |
1237 | } | |
1238 | } | |
1239 | return found; | |
1240 | } | |
1241 | ||
067fe038 TZ |
1242 | static struct hist_field *find_event_var(struct hist_trigger_data *hist_data, |
1243 | char *system, | |
1244 | char *event_name, | |
1245 | char *var_name) | |
1246 | { | |
1247 | struct trace_array *tr = hist_data->event_file->tr; | |
1248 | struct hist_field *hist_field = NULL; | |
1249 | struct trace_event_file *file; | |
1250 | ||
c282a386 TZ |
1251 | if (!system || !event_name) { |
1252 | hist_field = find_match_var(hist_data, var_name); | |
1253 | if (IS_ERR(hist_field)) | |
1254 | return NULL; | |
1255 | if (hist_field) | |
1256 | return hist_field; | |
1257 | } | |
1258 | ||
067fe038 TZ |
1259 | file = find_var_file(tr, system, event_name, var_name); |
1260 | if (!file) | |
1261 | return NULL; | |
1262 | ||
1263 | hist_field = find_file_var(file, var_name); | |
1264 | ||
1265 | return hist_field; | |
1266 | } | |
1267 | ||
067fe038 TZ |
1268 | static u64 hist_field_var_ref(struct hist_field *hist_field, |
1269 | struct tracing_map_elt *elt, | |
b47e3302 | 1270 | struct trace_buffer *buffer, |
067fe038 TZ |
1271 | struct ring_buffer_event *rbe, |
1272 | void *event) | |
1273 | { | |
1274 | struct hist_elt_data *elt_data; | |
1275 | u64 var_val = 0; | |
1276 | ||
55267c88 TZ |
1277 | if (WARN_ON_ONCE(!elt)) |
1278 | return var_val; | |
1279 | ||
067fe038 TZ |
1280 | elt_data = elt->private_data; |
1281 | var_val = elt_data->var_ref_vals[hist_field->var_ref_idx]; | |
1282 | ||
1283 | return var_val; | |
1284 | } | |
1285 | ||
1286 | static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key, | |
1287 | u64 *var_ref_vals, bool self) | |
1288 | { | |
1289 | struct hist_trigger_data *var_data; | |
1290 | struct tracing_map_elt *var_elt; | |
1291 | struct hist_field *hist_field; | |
1292 | unsigned int i, var_idx; | |
1293 | bool resolved = true; | |
1294 | u64 var_val = 0; | |
1295 | ||
1296 | for (i = 0; i < hist_data->n_var_refs; i++) { | |
1297 | hist_field = hist_data->var_refs[i]; | |
1298 | var_idx = hist_field->var.idx; | |
1299 | var_data = hist_field->var.hist_data; | |
1300 | ||
1301 | if (var_data == NULL) { | |
1302 | resolved = false; | |
1303 | break; | |
1304 | } | |
1305 | ||
1306 | if ((self && var_data != hist_data) || | |
1307 | (!self && var_data == hist_data)) | |
1308 | continue; | |
1309 | ||
1310 | var_elt = tracing_map_lookup(var_data->map, key); | |
1311 | if (!var_elt) { | |
1312 | resolved = false; | |
1313 | break; | |
1314 | } | |
1315 | ||
1316 | if (!tracing_map_var_set(var_elt, var_idx)) { | |
1317 | resolved = false; | |
1318 | break; | |
1319 | } | |
1320 | ||
1321 | if (self || !hist_field->read_once) | |
1322 | var_val = tracing_map_read_var(var_elt, var_idx); | |
1323 | else | |
1324 | var_val = tracing_map_read_var_once(var_elt, var_idx); | |
1325 | ||
1326 | var_ref_vals[i] = var_val; | |
1327 | } | |
1328 | ||
1329 | return resolved; | |
1330 | } | |
1331 | ||
85013256 TZ |
1332 | static const char *hist_field_name(struct hist_field *field, |
1333 | unsigned int level) | |
1334 | { | |
1335 | const char *field_name = ""; | |
1336 | ||
1337 | if (level > 1) | |
1338 | return field_name; | |
1339 | ||
1340 | if (field->field) | |
1341 | field_name = field->field->name; | |
7e8b88a3 | 1342 | else if (field->flags & HIST_FIELD_FL_LOG2 || |
de9a48a3 SRV |
1343 | field->flags & HIST_FIELD_FL_ALIAS || |
1344 | field->flags & HIST_FIELD_FL_BUCKET) | |
5819eadd | 1345 | field_name = hist_field_name(field->operands[0], ++level); |
8b7622bf | 1346 | else if (field->flags & HIST_FIELD_FL_CPU) |
1e3bac71 | 1347 | field_name = "common_cpu"; |
067fe038 TZ |
1348 | else if (field->flags & HIST_FIELD_FL_EXPR || |
1349 | field->flags & HIST_FIELD_FL_VAR_REF) { | |
1350 | if (field->system) { | |
1351 | static char full_name[MAX_FILTER_STR_VAL]; | |
1352 | ||
1353 | strcat(full_name, field->system); | |
1354 | strcat(full_name, "."); | |
1355 | strcat(full_name, field->event_name); | |
1356 | strcat(full_name, "."); | |
1357 | strcat(full_name, field->name); | |
1358 | field_name = full_name; | |
1359 | } else | |
1360 | field_name = field->name; | |
0ae7961e TZ |
1361 | } else if (field->flags & HIST_FIELD_FL_TIMESTAMP) |
1362 | field_name = "common_timestamp"; | |
5f2e094e TZ |
1363 | else if (field->flags & HIST_FIELD_FL_HITCOUNT) |
1364 | field_name = "hitcount"; | |
85013256 TZ |
1365 | |
1366 | if (field_name == NULL) | |
1367 | field_name = ""; | |
1368 | ||
1369 | return field_name; | |
1370 | } | |
1371 | ||
86087383 | 1372 | static enum hist_field_fn select_value_fn(int field_size, int field_is_signed) |
7ef224d1 | 1373 | { |
7ef224d1 TZ |
1374 | switch (field_size) { |
1375 | case 8: | |
1376 | if (field_is_signed) | |
86087383 | 1377 | return HIST_FIELD_FN_S64; |
7ef224d1 | 1378 | else |
86087383 | 1379 | return HIST_FIELD_FN_U64; |
7ef224d1 TZ |
1380 | case 4: |
1381 | if (field_is_signed) | |
86087383 | 1382 | return HIST_FIELD_FN_S32; |
7ef224d1 | 1383 | else |
86087383 | 1384 | return HIST_FIELD_FN_U32; |
7ef224d1 TZ |
1385 | case 2: |
1386 | if (field_is_signed) | |
86087383 | 1387 | return HIST_FIELD_FN_S16; |
7ef224d1 | 1388 | else |
86087383 | 1389 | return HIST_FIELD_FN_U16; |
7ef224d1 TZ |
1390 | case 1: |
1391 | if (field_is_signed) | |
86087383 | 1392 | return HIST_FIELD_FN_S8; |
7ef224d1 | 1393 | else |
86087383 | 1394 | return HIST_FIELD_FN_U8; |
7ef224d1 TZ |
1395 | } |
1396 | ||
86087383 | 1397 | return HIST_FIELD_FN_NOP; |
7ef224d1 TZ |
1398 | } |
1399 | ||
1400 | static int parse_map_size(char *str) | |
1401 | { | |
1402 | unsigned long size, map_bits; | |
1403 | int ret; | |
1404 | ||
7ef224d1 TZ |
1405 | ret = kstrtoul(str, 0, &size); |
1406 | if (ret) | |
1407 | goto out; | |
1408 | ||
1409 | map_bits = ilog2(roundup_pow_of_two(size)); | |
1410 | if (map_bits < TRACING_MAP_BITS_MIN || | |
1411 | map_bits > TRACING_MAP_BITS_MAX) | |
1412 | ret = -EINVAL; | |
1413 | else | |
1414 | ret = map_bits; | |
1415 | out: | |
1416 | return ret; | |
1417 | } | |
1418 | ||
1419 | static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs) | |
1420 | { | |
30350d65 TZ |
1421 | unsigned int i; |
1422 | ||
7ef224d1 TZ |
1423 | if (!attrs) |
1424 | return; | |
1425 | ||
30350d65 TZ |
1426 | for (i = 0; i < attrs->n_assignments; i++) |
1427 | kfree(attrs->assignment_str[i]); | |
1428 | ||
0212e2aa TZ |
1429 | for (i = 0; i < attrs->n_actions; i++) |
1430 | kfree(attrs->action_str[i]); | |
1431 | ||
5463bfda | 1432 | kfree(attrs->name); |
e62347d2 | 1433 | kfree(attrs->sort_key_str); |
7ef224d1 | 1434 | kfree(attrs->keys_str); |
f2606835 | 1435 | kfree(attrs->vals_str); |
a4072fe8 | 1436 | kfree(attrs->clock); |
7ef224d1 TZ |
1437 | kfree(attrs); |
1438 | } | |
1439 | ||
0212e2aa TZ |
1440 | static int parse_action(char *str, struct hist_trigger_attrs *attrs) |
1441 | { | |
c282a386 | 1442 | int ret = -EINVAL; |
0212e2aa TZ |
1443 | |
1444 | if (attrs->n_actions >= HIST_ACTIONS_MAX) | |
1445 | return ret; | |
1446 | ||
754481e6 | 1447 | if ((str_has_prefix(str, "onmatch(")) || |
dff81f55 TZ |
1448 | (str_has_prefix(str, "onmax(")) || |
1449 | (str_has_prefix(str, "onchange("))) { | |
c282a386 TZ |
1450 | attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL); |
1451 | if (!attrs->action_str[attrs->n_actions]) { | |
1452 | ret = -ENOMEM; | |
1453 | return ret; | |
1454 | } | |
1455 | attrs->n_actions++; | |
1456 | ret = 0; | |
1457 | } | |
0212e2aa TZ |
1458 | return ret; |
1459 | } | |
1460 | ||
d0cd871b SRV |
1461 | static int parse_assignment(struct trace_array *tr, |
1462 | char *str, struct hist_trigger_attrs *attrs) | |
9b1ae035 | 1463 | { |
b527b638 | 1464 | int len, ret = 0; |
9b1ae035 | 1465 | |
b527b638 TZ |
1466 | if ((len = str_has_prefix(str, "key=")) || |
1467 | (len = str_has_prefix(str, "keys="))) { | |
1468 | attrs->keys_str = kstrdup(str + len, GFP_KERNEL); | |
9b1ae035 TZ |
1469 | if (!attrs->keys_str) { |
1470 | ret = -ENOMEM; | |
1471 | goto out; | |
1472 | } | |
b527b638 TZ |
1473 | } else if ((len = str_has_prefix(str, "val=")) || |
1474 | (len = str_has_prefix(str, "vals=")) || | |
1475 | (len = str_has_prefix(str, "values="))) { | |
1476 | attrs->vals_str = kstrdup(str + len, GFP_KERNEL); | |
9b1ae035 TZ |
1477 | if (!attrs->vals_str) { |
1478 | ret = -ENOMEM; | |
1479 | goto out; | |
1480 | } | |
b527b638 TZ |
1481 | } else if ((len = str_has_prefix(str, "sort="))) { |
1482 | attrs->sort_key_str = kstrdup(str + len, GFP_KERNEL); | |
9b1ae035 TZ |
1483 | if (!attrs->sort_key_str) { |
1484 | ret = -ENOMEM; | |
1485 | goto out; | |
1486 | } | |
754481e6 | 1487 | } else if (str_has_prefix(str, "name=")) { |
9b1ae035 TZ |
1488 | attrs->name = kstrdup(str, GFP_KERNEL); |
1489 | if (!attrs->name) { | |
1490 | ret = -ENOMEM; | |
1491 | goto out; | |
1492 | } | |
b527b638 TZ |
1493 | } else if ((len = str_has_prefix(str, "clock="))) { |
1494 | str += len; | |
a4072fe8 TZ |
1495 | |
1496 | str = strstrip(str); | |
1497 | attrs->clock = kstrdup(str, GFP_KERNEL); | |
1498 | if (!attrs->clock) { | |
1499 | ret = -ENOMEM; | |
1500 | goto out; | |
1501 | } | |
b527b638 TZ |
1502 | } else if ((len = str_has_prefix(str, "size="))) { |
1503 | int map_bits = parse_map_size(str + len); | |
9b1ae035 TZ |
1504 | |
1505 | if (map_bits < 0) { | |
1506 | ret = map_bits; | |
1507 | goto out; | |
1508 | } | |
1509 | attrs->map_bits = map_bits; | |
30350d65 TZ |
1510 | } else { |
1511 | char *assignment; | |
1512 | ||
1513 | if (attrs->n_assignments == TRACING_MAP_VARS_MAX) { | |
d0cd871b | 1514 | hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str)); |
30350d65 TZ |
1515 | ret = -EINVAL; |
1516 | goto out; | |
1517 | } | |
1518 | ||
1519 | assignment = kstrdup(str, GFP_KERNEL); | |
1520 | if (!assignment) { | |
1521 | ret = -ENOMEM; | |
1522 | goto out; | |
1523 | } | |
1524 | ||
1525 | attrs->assignment_str[attrs->n_assignments++] = assignment; | |
1526 | } | |
9b1ae035 TZ |
1527 | out: |
1528 | return ret; | |
1529 | } | |
1530 | ||
d0cd871b SRV |
1531 | static struct hist_trigger_attrs * |
1532 | parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str) | |
7ef224d1 TZ |
1533 | { |
1534 | struct hist_trigger_attrs *attrs; | |
1535 | int ret = 0; | |
1536 | ||
1537 | attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); | |
1538 | if (!attrs) | |
1539 | return ERR_PTR(-ENOMEM); | |
1540 | ||
1541 | while (trigger_str) { | |
1542 | char *str = strsep(&trigger_str, ":"); | |
b527b638 | 1543 | char *rhs; |
7ef224d1 | 1544 | |
b527b638 TZ |
1545 | rhs = strchr(str, '='); |
1546 | if (rhs) { | |
1547 | if (!strlen(++rhs)) { | |
1548 | ret = -EINVAL; | |
4de26c8c | 1549 | hist_err(tr, HIST_ERR_EMPTY_ASSIGNMENT, errpos(str)); |
b527b638 TZ |
1550 | goto free; |
1551 | } | |
d0cd871b | 1552 | ret = parse_assignment(tr, str, attrs); |
9b1ae035 TZ |
1553 | if (ret) |
1554 | goto free; | |
ccf47f5c MHG |
1555 | } else if (strcmp(str, "nohitcount") == 0 || |
1556 | strcmp(str, "NOHC") == 0) | |
1557 | attrs->no_hitcount = true; | |
1558 | else if (strcmp(str, "pause") == 0) | |
83e99914 TZ |
1559 | attrs->pause = true; |
1560 | else if ((strcmp(str, "cont") == 0) || | |
1561 | (strcmp(str, "continue") == 0)) | |
1562 | attrs->cont = true; | |
e86ae9ba TZ |
1563 | else if (strcmp(str, "clear") == 0) |
1564 | attrs->clear = true; | |
9b1ae035 | 1565 | else { |
0212e2aa TZ |
1566 | ret = parse_action(str, attrs); |
1567 | if (ret) | |
1568 | goto free; | |
7ef224d1 TZ |
1569 | } |
1570 | } | |
1571 | ||
1572 | if (!attrs->keys_str) { | |
1573 | ret = -EINVAL; | |
1574 | goto free; | |
1575 | } | |
1576 | ||
a4072fe8 TZ |
1577 | if (!attrs->clock) { |
1578 | attrs->clock = kstrdup("global", GFP_KERNEL); | |
1579 | if (!attrs->clock) { | |
1580 | ret = -ENOMEM; | |
1581 | goto free; | |
1582 | } | |
1583 | } | |
1584 | ||
7ef224d1 TZ |
1585 | return attrs; |
1586 | free: | |
1587 | destroy_hist_trigger_attrs(attrs); | |
1588 | ||
1589 | return ERR_PTR(ret); | |
1590 | } | |
1591 | ||
6b4827ad TZ |
1592 | static inline void save_comm(char *comm, struct task_struct *task) |
1593 | { | |
1594 | if (!task->pid) { | |
1595 | strcpy(comm, "<idle>"); | |
1596 | return; | |
1597 | } | |
1598 | ||
1599 | if (WARN_ON_ONCE(task->pid < 0)) { | |
1600 | strcpy(comm, "<XXX>"); | |
1601 | return; | |
1602 | } | |
1603 | ||
27242c62 | 1604 | strncpy(comm, task->comm, TASK_COMM_LEN); |
6b4827ad TZ |
1605 | } |
1606 | ||
af6a29bc TZ |
1607 | static void hist_elt_data_free(struct hist_elt_data *elt_data) |
1608 | { | |
02205a67 TZ |
1609 | unsigned int i; |
1610 | ||
c910db94 | 1611 | for (i = 0; i < elt_data->n_field_var_str; i++) |
02205a67 TZ |
1612 | kfree(elt_data->field_var_str[i]); |
1613 | ||
c910db94 TZ |
1614 | kfree(elt_data->field_var_str); |
1615 | ||
af6a29bc TZ |
1616 | kfree(elt_data->comm); |
1617 | kfree(elt_data); | |
1618 | } | |
1619 | ||
1620 | static void hist_trigger_elt_data_free(struct tracing_map_elt *elt) | |
6b4827ad | 1621 | { |
af6a29bc TZ |
1622 | struct hist_elt_data *elt_data = elt->private_data; |
1623 | ||
1624 | hist_elt_data_free(elt_data); | |
6b4827ad TZ |
1625 | } |
1626 | ||
af6a29bc | 1627 | static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt) |
6b4827ad TZ |
1628 | { |
1629 | struct hist_trigger_data *hist_data = elt->map->private_data; | |
af6a29bc TZ |
1630 | unsigned int size = TASK_COMM_LEN; |
1631 | struct hist_elt_data *elt_data; | |
ed2cf907 | 1632 | struct hist_field *hist_field; |
02205a67 | 1633 | unsigned int i, n_str; |
6b4827ad | 1634 | |
af6a29bc TZ |
1635 | elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL); |
1636 | if (!elt_data) | |
1637 | return -ENOMEM; | |
1638 | ||
ed2cf907 SRV |
1639 | for_each_hist_field(i, hist_data) { |
1640 | hist_field = hist_data->fields[i]; | |
6b4827ad | 1641 | |
ed2cf907 | 1642 | if (hist_field->flags & HIST_FIELD_FL_EXECNAME) { |
af6a29bc TZ |
1643 | elt_data->comm = kzalloc(size, GFP_KERNEL); |
1644 | if (!elt_data->comm) { | |
1645 | kfree(elt_data); | |
6b4827ad | 1646 | return -ENOMEM; |
af6a29bc | 1647 | } |
6b4827ad TZ |
1648 | break; |
1649 | } | |
1650 | } | |
1651 | ||
63a1e5de TZ |
1652 | n_str = hist_data->n_field_var_str + hist_data->n_save_var_str + |
1653 | hist_data->n_var_str; | |
1654 | if (n_str > SYNTH_FIELDS_MAX) { | |
1655 | hist_elt_data_free(elt_data); | |
1656 | return -EINVAL; | |
1657 | } | |
02205a67 | 1658 | |
4a4a56b4 TZ |
1659 | BUILD_BUG_ON(STR_VAR_LEN_MAX & (sizeof(u64) - 1)); |
1660 | ||
02205a67 TZ |
1661 | size = STR_VAR_LEN_MAX; |
1662 | ||
c910db94 TZ |
1663 | elt_data->field_var_str = kcalloc(n_str, sizeof(char *), GFP_KERNEL); |
1664 | if (!elt_data->field_var_str) { | |
1665 | hist_elt_data_free(elt_data); | |
1666 | return -EINVAL; | |
1667 | } | |
1668 | elt_data->n_field_var_str = n_str; | |
1669 | ||
02205a67 TZ |
1670 | for (i = 0; i < n_str; i++) { |
1671 | elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL); | |
1672 | if (!elt_data->field_var_str[i]) { | |
1673 | hist_elt_data_free(elt_data); | |
1674 | return -ENOMEM; | |
1675 | } | |
1676 | } | |
1677 | ||
af6a29bc TZ |
1678 | elt->private_data = elt_data; |
1679 | ||
6b4827ad TZ |
1680 | return 0; |
1681 | } | |
1682 | ||
af6a29bc | 1683 | static void hist_trigger_elt_data_init(struct tracing_map_elt *elt) |
6b4827ad | 1684 | { |
af6a29bc | 1685 | struct hist_elt_data *elt_data = elt->private_data; |
6b4827ad | 1686 | |
af6a29bc TZ |
1687 | if (elt_data->comm) |
1688 | save_comm(elt_data->comm, current); | |
6b4827ad TZ |
1689 | } |
1690 | ||
af6a29bc TZ |
1691 | static const struct tracing_map_ops hist_trigger_elt_data_ops = { |
1692 | .elt_alloc = hist_trigger_elt_data_alloc, | |
1693 | .elt_free = hist_trigger_elt_data_free, | |
1694 | .elt_init = hist_trigger_elt_data_init, | |
6b4827ad TZ |
1695 | }; |
1696 | ||
2ece94fb TZ |
1697 | static const char *get_hist_field_flags(struct hist_field *hist_field) |
1698 | { | |
1699 | const char *flags_str = NULL; | |
1700 | ||
1701 | if (hist_field->flags & HIST_FIELD_FL_HEX) | |
1702 | flags_str = "hex"; | |
1703 | else if (hist_field->flags & HIST_FIELD_FL_SYM) | |
1704 | flags_str = "sym"; | |
1705 | else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET) | |
1706 | flags_str = "sym-offset"; | |
1707 | else if (hist_field->flags & HIST_FIELD_FL_EXECNAME) | |
1708 | flags_str = "execname"; | |
1709 | else if (hist_field->flags & HIST_FIELD_FL_SYSCALL) | |
1710 | flags_str = "syscall"; | |
1711 | else if (hist_field->flags & HIST_FIELD_FL_LOG2) | |
1712 | flags_str = "log2"; | |
de9a48a3 SRV |
1713 | else if (hist_field->flags & HIST_FIELD_FL_BUCKET) |
1714 | flags_str = "buckets"; | |
2ece94fb TZ |
1715 | else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS) |
1716 | flags_str = "usecs"; | |
abaa5258 MHG |
1717 | else if (hist_field->flags & HIST_FIELD_FL_PERCENT) |
1718 | flags_str = "percent"; | |
a2c54256 MHG |
1719 | else if (hist_field->flags & HIST_FIELD_FL_GRAPH) |
1720 | flags_str = "graph"; | |
2ece94fb TZ |
1721 | |
1722 | return flags_str; | |
1723 | } | |
1724 | ||
100719dc TZ |
1725 | static void expr_field_str(struct hist_field *field, char *expr) |
1726 | { | |
067fe038 TZ |
1727 | if (field->flags & HIST_FIELD_FL_VAR_REF) |
1728 | strcat(expr, "$"); | |
52cfb373 KS |
1729 | else if (field->flags & HIST_FIELD_FL_CONST) { |
1730 | char str[HIST_CONST_DIGITS_MAX]; | |
1731 | ||
1732 | snprintf(str, HIST_CONST_DIGITS_MAX, "%llu", field->constant); | |
1733 | strcat(expr, str); | |
1734 | } | |
067fe038 | 1735 | |
100719dc TZ |
1736 | strcat(expr, hist_field_name(field, 0)); |
1737 | ||
76690945 | 1738 | if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) { |
100719dc TZ |
1739 | const char *flags_str = get_hist_field_flags(field); |
1740 | ||
1741 | if (flags_str) { | |
1742 | strcat(expr, "."); | |
1743 | strcat(expr, 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(expr, "-("); | |
1768 | subexpr = expr_str(field->operands[0], ++level); | |
1769 | if (!subexpr) { | |
1770 | kfree(expr); | |
1771 | return NULL; | |
1772 | } | |
1773 | strcat(expr, subexpr); | |
1774 | strcat(expr, ")"); | |
1775 | ||
1776 | kfree(subexpr); | |
1777 | ||
1778 | return expr; | |
1779 | } | |
1780 | ||
1781 | expr_field_str(field->operands[0], expr); | |
1782 | ||
1783 | switch (field->operator) { | |
1784 | case FIELD_OP_MINUS: | |
1785 | strcat(expr, "-"); | |
1786 | break; | |
1787 | case FIELD_OP_PLUS: | |
1788 | strcat(expr, "+"); | |
1789 | break; | |
bcef0441 KS |
1790 | case FIELD_OP_DIV: |
1791 | strcat(expr, "/"); | |
1792 | break; | |
1793 | case FIELD_OP_MULT: | |
1794 | strcat(expr, "*"); | |
1795 | break; | |
100719dc TZ |
1796 | default: |
1797 | kfree(expr); | |
1798 | return NULL; | |
1799 | } | |
1800 | ||
1801 | expr_field_str(field->operands[1], expr); | |
1802 | ||
1803 | return expr; | |
1804 | } | |
1805 | ||
9710b2f3 KS |
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) | |
100719dc TZ |
1811 | { |
1812 | enum field_op_id field_op = FIELD_OP_NONE; | |
9710b2f3 | 1813 | char *minus_op, *plus_op, *div_op, *mult_op; |
100719dc | 1814 | |
100719dc | 1815 | |
9710b2f3 KS |
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 | */ | |
100719dc | 1825 | |
9710b2f3 KS |
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) { | |
26c56373 | 1832 | /* |
9710b2f3 KS |
1833 | * Unary minus is not supported in sub-expressions. If |
1834 | * present, it is always the next root operator. | |
26c56373 | 1835 | */ |
9710b2f3 | 1836 | if (minus_op == str) { |
100719dc | 1837 | field_op = FIELD_OP_UNARY_MINUS; |
9710b2f3 KS |
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) | |
bcef0441 | 1861 | field_op = FIELD_OP_DIV; |
9710b2f3 KS |
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) | |
bcef0441 | 1869 | field_op = FIELD_OP_MULT; |
9710b2f3 KS |
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 | } | |
100719dc TZ |
1892 | } |
1893 | ||
1894 | return field_op; | |
1895 | } | |
1896 | ||
8bcebc77 SRV |
1897 | static void get_hist_field(struct hist_field *hist_field) |
1898 | { | |
1899 | hist_field->ref++; | |
1900 | } | |
1901 | ||
656fe2ba TZ |
1902 | static void __destroy_hist_field(struct hist_field *hist_field) |
1903 | { | |
8bcebc77 SRV |
1904 | if (--hist_field->ref > 1) |
1905 | return; | |
1906 | ||
656fe2ba TZ |
1907 | kfree(hist_field->var.name); |
1908 | kfree(hist_field->name); | |
3347d80b SRV |
1909 | |
1910 | /* Can likely be a const */ | |
1911 | kfree_const(hist_field->type); | |
656fe2ba | 1912 | |
9da73974 VS |
1913 | kfree(hist_field->system); |
1914 | kfree(hist_field->event_name); | |
1915 | ||
656fe2ba TZ |
1916 | kfree(hist_field); |
1917 | } | |
1918 | ||
5819eadd TZ |
1919 | static void destroy_hist_field(struct hist_field *hist_field, |
1920 | unsigned int level) | |
7ef224d1 | 1921 | { |
5819eadd TZ |
1922 | unsigned int i; |
1923 | ||
100719dc | 1924 | if (level > 3) |
5819eadd TZ |
1925 | return; |
1926 | ||
1927 | if (!hist_field) | |
1928 | return; | |
1929 | ||
656fe2ba TZ |
1930 | if (hist_field->flags & HIST_FIELD_FL_VAR_REF) |
1931 | return; /* var refs will be destroyed separately */ | |
1932 | ||
5819eadd TZ |
1933 | for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) |
1934 | destroy_hist_field(hist_field->operands[i], level + 1); | |
1935 | ||
656fe2ba | 1936 | __destroy_hist_field(hist_field); |
7ef224d1 TZ |
1937 | } |
1938 | ||
b559d003 TZ |
1939 | static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data, |
1940 | struct ftrace_event_field *field, | |
30350d65 TZ |
1941 | unsigned long flags, |
1942 | char *var_name) | |
7ef224d1 TZ |
1943 | { |
1944 | struct hist_field *hist_field; | |
1945 | ||
1946 | if (field && is_function_field(field)) | |
1947 | return NULL; | |
1948 | ||
1949 | hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL); | |
1950 | if (!hist_field) | |
1951 | return NULL; | |
1952 | ||
8bcebc77 SRV |
1953 | hist_field->ref = 1; |
1954 | ||
b559d003 TZ |
1955 | hist_field->hist_data = hist_data; |
1956 | ||
7e8b88a3 | 1957 | if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS) |
100719dc TZ |
1958 | goto out; /* caller will populate */ |
1959 | ||
067fe038 | 1960 | if (flags & HIST_FIELD_FL_VAR_REF) { |
86087383 | 1961 | hist_field->fn_num = HIST_FIELD_FN_VAR_REF; |
067fe038 TZ |
1962 | goto out; |
1963 | } | |
1964 | ||
7ef224d1 | 1965 | if (flags & HIST_FIELD_FL_HITCOUNT) { |
86087383 | 1966 | hist_field->fn_num = HIST_FIELD_FN_COUNTER; |
19a9facd | 1967 | hist_field->size = sizeof(u64); |
3347d80b | 1968 | hist_field->type = "u64"; |
7ef224d1 TZ |
1969 | goto out; |
1970 | } | |
1971 | ||
52cfb373 | 1972 | if (flags & HIST_FIELD_FL_CONST) { |
86087383 | 1973 | hist_field->fn_num = HIST_FIELD_FN_CONST; |
52cfb373 KS |
1974 | hist_field->size = sizeof(u64); |
1975 | hist_field->type = kstrdup("u64", GFP_KERNEL); | |
1976 | if (!hist_field->type) | |
1977 | goto free; | |
1978 | goto out; | |
1979 | } | |
1980 | ||
69a0200c | 1981 | if (flags & HIST_FIELD_FL_STACKTRACE) { |
86087383 | 1982 | hist_field->fn_num = HIST_FIELD_FN_NOP; |
69a0200c TZ |
1983 | goto out; |
1984 | } | |
1985 | ||
de9a48a3 SRV |
1986 | if (flags & (HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET)) { |
1987 | unsigned long fl = flags & ~(HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET); | |
86087383 SRG |
1988 | hist_field->fn_num = flags & HIST_FIELD_FL_LOG2 ? HIST_FIELD_FN_LOG2 : |
1989 | HIST_FIELD_FN_BUCKET; | |
30350d65 | 1990 | hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL); |
5819eadd | 1991 | hist_field->size = hist_field->operands[0]->size; |
3347d80b | 1992 | hist_field->type = kstrdup_const(hist_field->operands[0]->type, GFP_KERNEL); |
19a9facd TZ |
1993 | if (!hist_field->type) |
1994 | goto free; | |
4b94f5b7 NK |
1995 | goto out; |
1996 | } | |
1997 | ||
ad42febe | 1998 | if (flags & HIST_FIELD_FL_TIMESTAMP) { |
86087383 | 1999 | hist_field->fn_num = HIST_FIELD_FN_TIMESTAMP; |
ad42febe | 2000 | hist_field->size = sizeof(u64); |
3347d80b | 2001 | hist_field->type = "u64"; |
ad42febe TZ |
2002 | goto out; |
2003 | } | |
2004 | ||
8b7622bf | 2005 | if (flags & HIST_FIELD_FL_CPU) { |
86087383 | 2006 | hist_field->fn_num = HIST_FIELD_FN_CPU; |
8b7622bf | 2007 | hist_field->size = sizeof(int); |
3347d80b | 2008 | hist_field->type = "unsigned int"; |
8b7622bf TZ |
2009 | goto out; |
2010 | } | |
2011 | ||
432480c5 TZ |
2012 | if (WARN_ON_ONCE(!field)) |
2013 | goto out; | |
2014 | ||
704adfb5 SRV |
2015 | /* Pointers to strings are just pointers and dangerous to dereference */ |
2016 | if (is_string_field(field) && | |
2017 | (field->filter_type != FILTER_PTR_STRING)) { | |
7ef224d1 | 2018 | flags |= HIST_FIELD_FL_STRING; |
79e577cb | 2019 | |
19a9facd | 2020 | hist_field->size = MAX_FILTER_STR_VAL; |
3347d80b | 2021 | hist_field->type = kstrdup_const(field->type, GFP_KERNEL); |
19a9facd TZ |
2022 | if (!hist_field->type) |
2023 | goto free; | |
2024 | ||
63f84ae6 | 2025 | if (field->filter_type == FILTER_STATIC_STRING) { |
86087383 | 2026 | hist_field->fn_num = HIST_FIELD_FN_STRING; |
63f84ae6 | 2027 | hist_field->size = field->size; |
05770dd0 | 2028 | } else if (field->filter_type == FILTER_DYN_STRING) { |
86087383 | 2029 | hist_field->fn_num = HIST_FIELD_FN_DYNSTRING; |
05770dd0 | 2030 | } else if (field->filter_type == FILTER_RDYN_STRING) |
86087383 | 2031 | hist_field->fn_num = HIST_FIELD_FN_RELDYNSTRING; |
79e577cb | 2032 | else |
86087383 | 2033 | hist_field->fn_num = HIST_FIELD_FN_PSTRING; |
7ef224d1 | 2034 | } else { |
19a9facd TZ |
2035 | hist_field->size = field->size; |
2036 | hist_field->is_signed = field->is_signed; | |
3347d80b | 2037 | hist_field->type = kstrdup_const(field->type, GFP_KERNEL); |
19a9facd TZ |
2038 | if (!hist_field->type) |
2039 | goto free; | |
2040 | ||
86087383 SRG |
2041 | hist_field->fn_num = select_value_fn(field->size, |
2042 | field->is_signed); | |
2043 | if (hist_field->fn_num == HIST_FIELD_FN_NOP) { | |
5819eadd | 2044 | destroy_hist_field(hist_field, 0); |
7ef224d1 TZ |
2045 | return NULL; |
2046 | } | |
2047 | } | |
2048 | out: | |
2049 | hist_field->field = field; | |
2050 | hist_field->flags = flags; | |
2051 | ||
30350d65 TZ |
2052 | if (var_name) { |
2053 | hist_field->var.name = kstrdup(var_name, GFP_KERNEL); | |
2054 | if (!hist_field->var.name) | |
2055 | goto free; | |
2056 | } | |
2057 | ||
7ef224d1 | 2058 | return hist_field; |
30350d65 TZ |
2059 | free: |
2060 | destroy_hist_field(hist_field, 0); | |
2061 | return NULL; | |
7ef224d1 TZ |
2062 | } |
2063 | ||
2064 | static void destroy_hist_fields(struct hist_trigger_data *hist_data) | |
2065 | { | |
2066 | unsigned int i; | |
2067 | ||
30350d65 | 2068 | for (i = 0; i < HIST_FIELDS_MAX; i++) { |
7ef224d1 | 2069 | if (hist_data->fields[i]) { |
5819eadd | 2070 | destroy_hist_field(hist_data->fields[i], 0); |
7ef224d1 TZ |
2071 | hist_data->fields[i] = NULL; |
2072 | } | |
2073 | } | |
656fe2ba TZ |
2074 | |
2075 | for (i = 0; i < hist_data->n_var_refs; i++) { | |
2076 | WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF)); | |
2077 | __destroy_hist_field(hist_data->var_refs[i]); | |
2078 | hist_data->var_refs[i] = NULL; | |
2079 | } | |
7ef224d1 TZ |
2080 | } |
2081 | ||
067fe038 TZ |
2082 | static int init_var_ref(struct hist_field *ref_field, |
2083 | struct hist_field *var_field, | |
2084 | char *system, char *event_name) | |
2085 | { | |
2086 | int err = 0; | |
2087 | ||
2088 | ref_field->var.idx = var_field->var.idx; | |
2089 | ref_field->var.hist_data = var_field->hist_data; | |
2090 | ref_field->size = var_field->size; | |
2091 | ref_field->is_signed = var_field->is_signed; | |
2092 | ref_field->flags |= var_field->flags & | |
2093 | (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); | |
2094 | ||
2095 | if (system) { | |
2096 | ref_field->system = kstrdup(system, GFP_KERNEL); | |
2097 | if (!ref_field->system) | |
2098 | return -ENOMEM; | |
2099 | } | |
2100 | ||
2101 | if (event_name) { | |
2102 | ref_field->event_name = kstrdup(event_name, GFP_KERNEL); | |
2103 | if (!ref_field->event_name) { | |
2104 | err = -ENOMEM; | |
2105 | goto free; | |
2106 | } | |
2107 | } | |
2108 | ||
7e8b88a3 TZ |
2109 | if (var_field->var.name) { |
2110 | ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL); | |
2111 | if (!ref_field->name) { | |
2112 | err = -ENOMEM; | |
2113 | goto free; | |
2114 | } | |
2115 | } else if (var_field->name) { | |
2116 | ref_field->name = kstrdup(var_field->name, GFP_KERNEL); | |
2117 | if (!ref_field->name) { | |
2118 | err = -ENOMEM; | |
2119 | goto free; | |
2120 | } | |
067fe038 TZ |
2121 | } |
2122 | ||
3347d80b | 2123 | ref_field->type = kstrdup_const(var_field->type, GFP_KERNEL); |
067fe038 TZ |
2124 | if (!ref_field->type) { |
2125 | err = -ENOMEM; | |
2126 | goto free; | |
2127 | } | |
2128 | out: | |
2129 | return err; | |
2130 | free: | |
2131 | kfree(ref_field->system); | |
99696a25 | 2132 | ref_field->system = NULL; |
067fe038 | 2133 | kfree(ref_field->event_name); |
99696a25 | 2134 | ref_field->event_name = NULL; |
067fe038 | 2135 | kfree(ref_field->name); |
99696a25 | 2136 | ref_field->name = NULL; |
067fe038 TZ |
2137 | |
2138 | goto out; | |
2139 | } | |
2140 | ||
d380dcde TZ |
2141 | static int find_var_ref_idx(struct hist_trigger_data *hist_data, |
2142 | struct hist_field *var_field) | |
2143 | { | |
2144 | struct hist_field *ref_field; | |
2145 | int i; | |
2146 | ||
2147 | for (i = 0; i < hist_data->n_var_refs; i++) { | |
2148 | ref_field = hist_data->var_refs[i]; | |
2149 | if (ref_field->var.idx == var_field->var.idx && | |
2150 | ref_field->var.hist_data == var_field->hist_data) | |
2151 | return i; | |
2152 | } | |
2153 | ||
2154 | return -ENOENT; | |
2155 | } | |
2156 | ||
de40f033 TZ |
2157 | /** |
2158 | * create_var_ref - Create a variable reference and attach it to trigger | |
2159 | * @hist_data: The trigger that will be referencing the variable | |
2160 | * @var_field: The VAR field to create a reference to | |
2161 | * @system: The optional system string | |
2162 | * @event_name: The optional event_name string | |
2163 | * | |
2164 | * Given a variable hist_field, create a VAR_REF hist_field that | |
2165 | * represents a reference to it. | |
2166 | * | |
2167 | * This function also adds the reference to the trigger that | |
2168 | * now references the variable. | |
2169 | * | |
2170 | * Return: The VAR_REF field if successful, NULL if not | |
2171 | */ | |
2172 | static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data, | |
2173 | struct hist_field *var_field, | |
067fe038 TZ |
2174 | char *system, char *event_name) |
2175 | { | |
2176 | unsigned long flags = HIST_FIELD_FL_VAR_REF; | |
2177 | struct hist_field *ref_field; | |
8bcebc77 SRV |
2178 | int i; |
2179 | ||
2180 | /* Check if the variable already exists */ | |
2181 | for (i = 0; i < hist_data->n_var_refs; i++) { | |
2182 | ref_field = hist_data->var_refs[i]; | |
2183 | if (ref_field->var.idx == var_field->var.idx && | |
2184 | ref_field->var.hist_data == var_field->hist_data) { | |
2185 | get_hist_field(ref_field); | |
2186 | return ref_field; | |
2187 | } | |
2188 | } | |
82470f7d ZY |
2189 | /* Sanity check to avoid out-of-bound write on 'hist_data->var_refs' */ |
2190 | if (hist_data->n_var_refs >= TRACING_MAP_VARS_MAX) | |
2191 | return NULL; | |
067fe038 TZ |
2192 | ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL); |
2193 | if (ref_field) { | |
2194 | if (init_var_ref(ref_field, var_field, system, event_name)) { | |
2195 | destroy_hist_field(ref_field, 0); | |
2196 | return NULL; | |
2197 | } | |
de40f033 TZ |
2198 | |
2199 | hist_data->var_refs[hist_data->n_var_refs] = ref_field; | |
2200 | ref_field->var_ref_idx = hist_data->n_var_refs++; | |
067fe038 TZ |
2201 | } |
2202 | ||
2203 | return ref_field; | |
2204 | } | |
2205 | ||
2206 | static bool is_var_ref(char *var_name) | |
2207 | { | |
2208 | if (!var_name || strlen(var_name) < 2 || var_name[0] != '$') | |
2209 | return false; | |
2210 | ||
2211 | return true; | |
2212 | } | |
2213 | ||
2214 | static char *field_name_from_var(struct hist_trigger_data *hist_data, | |
2215 | char *var_name) | |
2216 | { | |
2217 | char *name, *field; | |
2218 | unsigned int i; | |
2219 | ||
2220 | for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { | |
2221 | name = hist_data->attrs->var_defs.name[i]; | |
2222 | ||
2223 | if (strcmp(var_name, name) == 0) { | |
2224 | field = hist_data->attrs->var_defs.expr[i]; | |
9710b2f3 | 2225 | if (contains_operator(field, NULL) || is_var_ref(field)) |
067fe038 TZ |
2226 | continue; |
2227 | return field; | |
2228 | } | |
2229 | } | |
2230 | ||
2231 | return NULL; | |
2232 | } | |
2233 | ||
2234 | static char *local_field_var_ref(struct hist_trigger_data *hist_data, | |
2235 | char *system, char *event_name, | |
2236 | char *var_name) | |
2237 | { | |
2238 | struct trace_event_call *call; | |
2239 | ||
2240 | if (system && event_name) { | |
2241 | call = hist_data->event_file->event_call; | |
2242 | ||
2243 | if (strcmp(system, call->class->system) != 0) | |
2244 | return NULL; | |
2245 | ||
2246 | if (strcmp(event_name, trace_event_name(call)) != 0) | |
2247 | return NULL; | |
2248 | } | |
2249 | ||
2250 | if (!!system != !!event_name) | |
2251 | return NULL; | |
2252 | ||
2253 | if (!is_var_ref(var_name)) | |
2254 | return NULL; | |
2255 | ||
2256 | var_name++; | |
2257 | ||
2258 | return field_name_from_var(hist_data, var_name); | |
2259 | } | |
2260 | ||
2261 | static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data, | |
2262 | char *system, char *event_name, | |
2263 | char *var_name) | |
2264 | { | |
2265 | struct hist_field *var_field = NULL, *ref_field = NULL; | |
d0cd871b | 2266 | struct trace_array *tr = hist_data->event_file->tr; |
067fe038 TZ |
2267 | |
2268 | if (!is_var_ref(var_name)) | |
2269 | return NULL; | |
2270 | ||
2271 | var_name++; | |
2272 | ||
2273 | var_field = find_event_var(hist_data, system, event_name, var_name); | |
2274 | if (var_field) | |
de40f033 TZ |
2275 | ref_field = create_var_ref(hist_data, var_field, |
2276 | system, event_name); | |
067fe038 | 2277 | |
f404da6e | 2278 | if (!ref_field) |
d0cd871b | 2279 | hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name)); |
f404da6e | 2280 | |
067fe038 TZ |
2281 | return ref_field; |
2282 | } | |
2283 | ||
100719dc TZ |
2284 | static struct ftrace_event_field * |
2285 | parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file, | |
de9a48a3 | 2286 | char *field_str, unsigned long *flags, unsigned long *buckets) |
100719dc TZ |
2287 | { |
2288 | struct ftrace_event_field *field = NULL; | |
2289 | char *field_name, *modifier, *str; | |
d0cd871b | 2290 | struct trace_array *tr = file->tr; |
100719dc TZ |
2291 | |
2292 | modifier = str = kstrdup(field_str, GFP_KERNEL); | |
2293 | if (!modifier) | |
2294 | return ERR_PTR(-ENOMEM); | |
2295 | ||
2296 | field_name = strsep(&modifier, "."); | |
2297 | if (modifier) { | |
2298 | if (strcmp(modifier, "hex") == 0) | |
2299 | *flags |= HIST_FIELD_FL_HEX; | |
2300 | else if (strcmp(modifier, "sym") == 0) | |
2301 | *flags |= HIST_FIELD_FL_SYM; | |
c5eac6ee KS |
2302 | /* |
2303 | * 'sym-offset' occurrences in the trigger string are modified | |
2304 | * to 'symXoffset' to simplify arithmetic expression parsing. | |
2305 | */ | |
2306 | else if (strcmp(modifier, "symXoffset") == 0) | |
100719dc TZ |
2307 | *flags |= HIST_FIELD_FL_SYM_OFFSET; |
2308 | else if ((strcmp(modifier, "execname") == 0) && | |
2309 | (strcmp(field_name, "common_pid") == 0)) | |
2310 | *flags |= HIST_FIELD_FL_EXECNAME; | |
2311 | else if (strcmp(modifier, "syscall") == 0) | |
2312 | *flags |= HIST_FIELD_FL_SYSCALL; | |
2313 | else if (strcmp(modifier, "log2") == 0) | |
2314 | *flags |= HIST_FIELD_FL_LOG2; | |
2315 | else if (strcmp(modifier, "usecs") == 0) | |
2316 | *flags |= HIST_FIELD_FL_TIMESTAMP_USECS; | |
de9a48a3 SRV |
2317 | else if (strncmp(modifier, "bucket", 6) == 0) { |
2318 | int ret; | |
2319 | ||
2320 | modifier += 6; | |
2321 | ||
2322 | if (*modifier == 's') | |
2323 | modifier++; | |
2324 | if (*modifier != '=') | |
2325 | goto error; | |
2326 | modifier++; | |
2327 | ret = kstrtoul(modifier, 0, buckets); | |
2328 | if (ret || !(*buckets)) | |
2329 | goto error; | |
2330 | *flags |= HIST_FIELD_FL_BUCKET; | |
abaa5258 MHG |
2331 | } else if (strncmp(modifier, "percent", 7) == 0) { |
2332 | if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY)) | |
2333 | goto error; | |
2334 | *flags |= HIST_FIELD_FL_PERCENT; | |
a2c54256 MHG |
2335 | } else if (strncmp(modifier, "graph", 5) == 0) { |
2336 | if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY)) | |
2337 | goto error; | |
2338 | *flags |= HIST_FIELD_FL_GRAPH; | |
de9a48a3 SRV |
2339 | } else { |
2340 | error: | |
d0cd871b | 2341 | hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier)); |
100719dc TZ |
2342 | field = ERR_PTR(-EINVAL); |
2343 | goto out; | |
2344 | } | |
2345 | } | |
2346 | ||
2347 | if (strcmp(field_name, "common_timestamp") == 0) { | |
2348 | *flags |= HIST_FIELD_FL_TIMESTAMP; | |
2349 | hist_data->enable_timestamps = true; | |
2350 | if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS) | |
2351 | hist_data->attrs->ts_in_usecs = true; | |
1e3bac71 | 2352 | } else if (strcmp(field_name, "common_cpu") == 0) |
8b7622bf | 2353 | *flags |= HIST_FIELD_FL_CPU; |
5f2e094e TZ |
2354 | else if (strcmp(field_name, "hitcount") == 0) |
2355 | *flags |= HIST_FIELD_FL_HITCOUNT; | |
8b7622bf | 2356 | else { |
100719dc TZ |
2357 | field = trace_find_event_field(file->event_call, field_name); |
2358 | if (!field || !field->size) { | |
1e3bac71 SRV |
2359 | /* |
2360 | * For backward compatibility, if field_name | |
2361 | * was "cpu", then we treat this the same as | |
1d1898f6 | 2362 | * common_cpu. This also works for "CPU". |
1e3bac71 | 2363 | */ |
1d1898f6 | 2364 | if (field && field->filter_type == FILTER_CPU) { |
1e3bac71 SRV |
2365 | *flags |= HIST_FIELD_FL_CPU; |
2366 | } else { | |
2367 | hist_err(tr, HIST_ERR_FIELD_NOT_FOUND, | |
2368 | errpos(field_name)); | |
2369 | field = ERR_PTR(-EINVAL); | |
2370 | goto out; | |
2371 | } | |
100719dc TZ |
2372 | } |
2373 | } | |
2374 | out: | |
2375 | kfree(str); | |
2376 | ||
2377 | return field; | |
2378 | } | |
2379 | ||
7e8b88a3 TZ |
2380 | static struct hist_field *create_alias(struct hist_trigger_data *hist_data, |
2381 | struct hist_field *var_ref, | |
2382 | char *var_name) | |
2383 | { | |
2384 | struct hist_field *alias = NULL; | |
2385 | unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR; | |
2386 | ||
2387 | alias = create_hist_field(hist_data, NULL, flags, var_name); | |
2388 | if (!alias) | |
2389 | return NULL; | |
2390 | ||
86087383 | 2391 | alias->fn_num = var_ref->fn_num; |
7e8b88a3 TZ |
2392 | alias->operands[0] = var_ref; |
2393 | ||
2394 | if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) { | |
2395 | destroy_hist_field(alias, 0); | |
2396 | return NULL; | |
2397 | } | |
2398 | ||
17f8607a TZ |
2399 | alias->var_ref_idx = var_ref->var_ref_idx; |
2400 | ||
7e8b88a3 TZ |
2401 | return alias; |
2402 | } | |
2403 | ||
52cfb373 KS |
2404 | static struct hist_field *parse_const(struct hist_trigger_data *hist_data, |
2405 | char *str, char *var_name, | |
2406 | unsigned long *flags) | |
2407 | { | |
2408 | struct trace_array *tr = hist_data->event_file->tr; | |
2409 | struct hist_field *field = NULL; | |
2410 | u64 constant; | |
2411 | ||
2412 | if (kstrtoull(str, 0, &constant)) { | |
2413 | hist_err(tr, HIST_ERR_EXPECT_NUMBER, errpos(str)); | |
2414 | return NULL; | |
2415 | } | |
2416 | ||
2417 | *flags |= HIST_FIELD_FL_CONST; | |
2418 | field = create_hist_field(hist_data, NULL, *flags, var_name); | |
2419 | if (!field) | |
2420 | return NULL; | |
2421 | ||
2422 | field->constant = constant; | |
2423 | ||
2424 | return field; | |
2425 | } | |
2426 | ||
100719dc TZ |
2427 | static struct hist_field *parse_atom(struct hist_trigger_data *hist_data, |
2428 | struct trace_event_file *file, char *str, | |
2429 | unsigned long *flags, char *var_name) | |
2430 | { | |
067fe038 | 2431 | char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str; |
100719dc TZ |
2432 | struct ftrace_event_field *field = NULL; |
2433 | struct hist_field *hist_field = NULL; | |
de9a48a3 | 2434 | unsigned long buckets = 0; |
100719dc TZ |
2435 | int ret = 0; |
2436 | ||
52cfb373 KS |
2437 | if (isdigit(str[0])) { |
2438 | hist_field = parse_const(hist_data, str, var_name, flags); | |
2439 | if (!hist_field) { | |
2440 | ret = -EINVAL; | |
2441 | goto out; | |
2442 | } | |
2443 | return hist_field; | |
2444 | } | |
2445 | ||
067fe038 TZ |
2446 | s = strchr(str, '.'); |
2447 | if (s) { | |
2448 | s = strchr(++s, '.'); | |
2449 | if (s) { | |
2450 | ref_system = strsep(&str, "."); | |
2451 | if (!str) { | |
2452 | ret = -EINVAL; | |
2453 | goto out; | |
2454 | } | |
2455 | ref_event = strsep(&str, "."); | |
2456 | if (!str) { | |
2457 | ret = -EINVAL; | |
2458 | goto out; | |
2459 | } | |
2460 | ref_var = str; | |
2461 | } | |
2462 | } | |
2463 | ||
2464 | s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var); | |
2465 | if (!s) { | |
d0cd871b SRV |
2466 | hist_field = parse_var_ref(hist_data, ref_system, |
2467 | ref_event, ref_var); | |
067fe038 | 2468 | if (hist_field) { |
7e8b88a3 TZ |
2469 | if (var_name) { |
2470 | hist_field = create_alias(hist_data, hist_field, var_name); | |
2471 | if (!hist_field) { | |
2472 | ret = -ENOMEM; | |
2473 | goto out; | |
2474 | } | |
2475 | } | |
067fe038 TZ |
2476 | return hist_field; |
2477 | } | |
2478 | } else | |
2479 | str = s; | |
2480 | ||
de9a48a3 | 2481 | field = parse_field(hist_data, file, str, flags, &buckets); |
100719dc TZ |
2482 | if (IS_ERR(field)) { |
2483 | ret = PTR_ERR(field); | |
2484 | goto out; | |
2485 | } | |
2486 | ||
2487 | hist_field = create_hist_field(hist_data, field, *flags, var_name); | |
2488 | if (!hist_field) { | |
2489 | ret = -ENOMEM; | |
2490 | goto out; | |
2491 | } | |
de9a48a3 | 2492 | hist_field->buckets = buckets; |
100719dc TZ |
2493 | |
2494 | return hist_field; | |
2495 | out: | |
2496 | return ERR_PTR(ret); | |
2497 | } | |
2498 | ||
2499 | static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, | |
2500 | struct trace_event_file *file, | |
2501 | char *str, unsigned long flags, | |
9710b2f3 | 2502 | char *var_name, unsigned int *n_subexprs); |
100719dc TZ |
2503 | |
2504 | static struct hist_field *parse_unary(struct hist_trigger_data *hist_data, | |
2505 | struct trace_event_file *file, | |
2506 | char *str, unsigned long flags, | |
9710b2f3 | 2507 | char *var_name, unsigned int *n_subexprs) |
100719dc TZ |
2508 | { |
2509 | struct hist_field *operand1, *expr = NULL; | |
2510 | unsigned long operand_flags; | |
2511 | int ret = 0; | |
2512 | char *s; | |
2513 | ||
9710b2f3 KS |
2514 | /* Unary minus operator, increment n_subexprs */ |
2515 | ++*n_subexprs; | |
2516 | ||
100719dc TZ |
2517 | /* we support only -(xxx) i.e. explicit parens required */ |
2518 | ||
9710b2f3 | 2519 | if (*n_subexprs > 3) { |
d0cd871b | 2520 | hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str)); |
100719dc TZ |
2521 | ret = -EINVAL; |
2522 | goto free; | |
2523 | } | |
2524 | ||
2525 | str++; /* skip leading '-' */ | |
2526 | ||
2527 | s = strchr(str, '('); | |
2528 | if (s) | |
2529 | str++; | |
2530 | else { | |
2531 | ret = -EINVAL; | |
2532 | goto free; | |
2533 | } | |
2534 | ||
2535 | s = strrchr(str, ')'); | |
9710b2f3 KS |
2536 | if (s) { |
2537 | /* unary minus not supported in sub-expressions */ | |
2538 | if (*(s+1) != '\0') { | |
2539 | hist_err(file->tr, HIST_ERR_UNARY_MINUS_SUBEXPR, | |
2540 | errpos(str)); | |
2541 | ret = -EINVAL; | |
2542 | goto free; | |
2543 | } | |
100719dc | 2544 | *s = '\0'; |
9710b2f3 | 2545 | } |
100719dc TZ |
2546 | else { |
2547 | ret = -EINVAL; /* no closing ')' */ | |
2548 | goto free; | |
2549 | } | |
2550 | ||
2551 | flags |= HIST_FIELD_FL_EXPR; | |
2552 | expr = create_hist_field(hist_data, NULL, flags, var_name); | |
2553 | if (!expr) { | |
2554 | ret = -ENOMEM; | |
2555 | goto free; | |
2556 | } | |
2557 | ||
2558 | operand_flags = 0; | |
9710b2f3 | 2559 | operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, n_subexprs); |
100719dc TZ |
2560 | if (IS_ERR(operand1)) { |
2561 | ret = PTR_ERR(operand1); | |
2562 | goto free; | |
2563 | } | |
a9d10ca4 MH |
2564 | if (operand1->flags & HIST_FIELD_FL_STRING) { |
2565 | /* String type can not be the operand of unary operator. */ | |
2566 | hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str)); | |
2567 | destroy_hist_field(operand1, 0); | |
2568 | ret = -EINVAL; | |
2569 | goto free; | |
2570 | } | |
100719dc TZ |
2571 | |
2572 | expr->flags |= operand1->flags & | |
2573 | (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); | |
86087383 | 2574 | expr->fn_num = HIST_FIELD_FN_UMINUS; |
100719dc | 2575 | expr->operands[0] = operand1; |
097f1eef TZ |
2576 | expr->size = operand1->size; |
2577 | expr->is_signed = operand1->is_signed; | |
100719dc TZ |
2578 | expr->operator = FIELD_OP_UNARY_MINUS; |
2579 | expr->name = expr_str(expr, 0); | |
3347d80b | 2580 | expr->type = kstrdup_const(operand1->type, GFP_KERNEL); |
19a9facd TZ |
2581 | if (!expr->type) { |
2582 | ret = -ENOMEM; | |
2583 | goto free; | |
2584 | } | |
100719dc TZ |
2585 | |
2586 | return expr; | |
2587 | free: | |
2588 | destroy_hist_field(expr, 0); | |
2589 | return ERR_PTR(ret); | |
2590 | } | |
2591 | ||
f47716b7 KS |
2592 | /* |
2593 | * If the operands are var refs, return pointers the | |
2594 | * variable(s) referenced in var1 and var2, else NULL. | |
2595 | */ | |
d0cd871b SRV |
2596 | static int check_expr_operands(struct trace_array *tr, |
2597 | struct hist_field *operand1, | |
f47716b7 KS |
2598 | struct hist_field *operand2, |
2599 | struct hist_field **var1, | |
2600 | struct hist_field **var2) | |
100719dc TZ |
2601 | { |
2602 | unsigned long operand1_flags = operand1->flags; | |
2603 | unsigned long operand2_flags = operand2->flags; | |
2604 | ||
7e8b88a3 TZ |
2605 | if ((operand1_flags & HIST_FIELD_FL_VAR_REF) || |
2606 | (operand1_flags & HIST_FIELD_FL_ALIAS)) { | |
2607 | struct hist_field *var; | |
2608 | ||
2609 | var = find_var_field(operand1->var.hist_data, operand1->name); | |
2610 | if (!var) | |
2611 | return -EINVAL; | |
2612 | operand1_flags = var->flags; | |
f47716b7 | 2613 | *var1 = var; |
7e8b88a3 TZ |
2614 | } |
2615 | ||
2616 | if ((operand2_flags & HIST_FIELD_FL_VAR_REF) || | |
2617 | (operand2_flags & HIST_FIELD_FL_ALIAS)) { | |
2618 | struct hist_field *var; | |
2619 | ||
2620 | var = find_var_field(operand2->var.hist_data, operand2->name); | |
2621 | if (!var) | |
2622 | return -EINVAL; | |
2623 | operand2_flags = var->flags; | |
f47716b7 | 2624 | *var2 = var; |
7e8b88a3 TZ |
2625 | } |
2626 | ||
100719dc | 2627 | if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) != |
f404da6e | 2628 | (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) { |
d0cd871b | 2629 | hist_err(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0); |
100719dc | 2630 | return -EINVAL; |
f404da6e | 2631 | } |
100719dc TZ |
2632 | |
2633 | return 0; | |
2634 | } | |
2635 | ||
2636 | static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, | |
2637 | struct trace_event_file *file, | |
2638 | char *str, unsigned long flags, | |
9710b2f3 | 2639 | char *var_name, unsigned int *n_subexprs) |
100719dc TZ |
2640 | { |
2641 | struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL; | |
f47716b7 KS |
2642 | struct hist_field *var1 = NULL, *var2 = NULL; |
2643 | unsigned long operand_flags, operand2_flags; | |
100719dc TZ |
2644 | int field_op, ret = -EINVAL; |
2645 | char *sep, *operand1_str; | |
86087383 | 2646 | enum hist_field_fn op_fn; |
f47716b7 | 2647 | bool combine_consts; |
100719dc | 2648 | |
9710b2f3 | 2649 | if (*n_subexprs > 3) { |
d0cd871b | 2650 | hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str)); |
100719dc | 2651 | return ERR_PTR(-EINVAL); |
f404da6e | 2652 | } |
100719dc | 2653 | |
9710b2f3 | 2654 | field_op = contains_operator(str, &sep); |
100719dc TZ |
2655 | |
2656 | if (field_op == FIELD_OP_NONE) | |
2657 | return parse_atom(hist_data, file, str, &flags, var_name); | |
2658 | ||
2659 | if (field_op == FIELD_OP_UNARY_MINUS) | |
9710b2f3 | 2660 | return parse_unary(hist_data, file, str, flags, var_name, n_subexprs); |
100719dc | 2661 | |
9710b2f3 KS |
2662 | /* Binary operator found, increment n_subexprs */ |
2663 | ++*n_subexprs; | |
100719dc | 2664 | |
9710b2f3 KS |
2665 | /* Split the expression string at the root operator */ |
2666 | if (!sep) | |
f86b0aaa KS |
2667 | return ERR_PTR(-EINVAL); |
2668 | ||
9710b2f3 KS |
2669 | *sep = '\0'; |
2670 | operand1_str = str; | |
2671 | str = sep+1; | |
100719dc | 2672 | |
1cab6bce KS |
2673 | /* Binary operator requires both operands */ |
2674 | if (*operand1_str == '\0' || *str == '\0') | |
f86b0aaa | 2675 | return ERR_PTR(-EINVAL); |
100719dc TZ |
2676 | |
2677 | operand_flags = 0; | |
9710b2f3 KS |
2678 | |
2679 | /* LHS of string is an expression e.g. a+b in a+b+c */ | |
2680 | operand1 = parse_expr(hist_data, file, operand1_str, operand_flags, NULL, n_subexprs); | |
f86b0aaa KS |
2681 | if (IS_ERR(operand1)) |
2682 | return ERR_CAST(operand1); | |
2683 | ||
a9d10ca4 MH |
2684 | if (operand1->flags & HIST_FIELD_FL_STRING) { |
2685 | hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(operand1_str)); | |
2686 | ret = -EINVAL; | |
f86b0aaa | 2687 | goto free_op1; |
a9d10ca4 | 2688 | } |
100719dc | 2689 | |
9710b2f3 | 2690 | /* RHS of string is another expression e.g. c in a+b+c */ |
100719dc | 2691 | operand_flags = 0; |
9710b2f3 | 2692 | operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, n_subexprs); |
100719dc TZ |
2693 | if (IS_ERR(operand2)) { |
2694 | ret = PTR_ERR(operand2); | |
f86b0aaa | 2695 | goto free_op1; |
100719dc | 2696 | } |
a9d10ca4 MH |
2697 | if (operand2->flags & HIST_FIELD_FL_STRING) { |
2698 | hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str)); | |
2699 | ret = -EINVAL; | |
f86b0aaa | 2700 | goto free_operands; |
a9d10ca4 | 2701 | } |
100719dc | 2702 | |
f47716b7 KS |
2703 | switch (field_op) { |
2704 | case FIELD_OP_MINUS: | |
86087383 | 2705 | op_fn = HIST_FIELD_FN_MINUS; |
f47716b7 KS |
2706 | break; |
2707 | case FIELD_OP_PLUS: | |
86087383 | 2708 | op_fn = HIST_FIELD_FN_PLUS; |
f47716b7 KS |
2709 | break; |
2710 | case FIELD_OP_DIV: | |
86087383 | 2711 | op_fn = HIST_FIELD_FN_DIV; |
f47716b7 KS |
2712 | break; |
2713 | case FIELD_OP_MULT: | |
86087383 | 2714 | op_fn = HIST_FIELD_FN_MULT; |
f47716b7 KS |
2715 | break; |
2716 | default: | |
2717 | ret = -EINVAL; | |
f86b0aaa | 2718 | goto free_operands; |
f47716b7 KS |
2719 | } |
2720 | ||
2721 | ret = check_expr_operands(file->tr, operand1, operand2, &var1, &var2); | |
100719dc | 2722 | if (ret) |
f86b0aaa | 2723 | goto free_operands; |
100719dc | 2724 | |
f47716b7 KS |
2725 | operand_flags = var1 ? var1->flags : operand1->flags; |
2726 | operand2_flags = var2 ? var2->flags : operand2->flags; | |
2727 | ||
2728 | /* | |
2729 | * If both operands are constant, the expression can be | |
2730 | * collapsed to a single constant. | |
2731 | */ | |
2732 | combine_consts = operand_flags & operand2_flags & HIST_FIELD_FL_CONST; | |
2733 | ||
2734 | flags |= combine_consts ? HIST_FIELD_FL_CONST : HIST_FIELD_FL_EXPR; | |
100719dc TZ |
2735 | |
2736 | flags |= operand1->flags & | |
2737 | (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); | |
2738 | ||
2739 | expr = create_hist_field(hist_data, NULL, flags, var_name); | |
2740 | if (!expr) { | |
2741 | ret = -ENOMEM; | |
f86b0aaa | 2742 | goto free_operands; |
100719dc TZ |
2743 | } |
2744 | ||
067fe038 TZ |
2745 | operand1->read_once = true; |
2746 | operand2->read_once = true; | |
2747 | ||
f86b0aaa | 2748 | /* The operands are now owned and free'd by 'expr' */ |
100719dc TZ |
2749 | expr->operands[0] = operand1; |
2750 | expr->operands[1] = operand2; | |
2c05caa7 | 2751 | |
8b5d46fd KS |
2752 | if (field_op == FIELD_OP_DIV && |
2753 | operand2_flags & HIST_FIELD_FL_CONST) { | |
2754 | u64 divisor = var2 ? var2->constant : operand2->constant; | |
2755 | ||
2756 | if (!divisor) { | |
2757 | hist_err(file->tr, HIST_ERR_DIVISION_BY_ZERO, errpos(str)); | |
2758 | ret = -EDOM; | |
f86b0aaa | 2759 | goto free_expr; |
8b5d46fd KS |
2760 | } |
2761 | ||
2762 | /* | |
2763 | * Copy the divisor here so we don't have to look it up | |
2764 | * later if this is a var ref | |
2765 | */ | |
2766 | operand2->constant = divisor; | |
2767 | op_fn = hist_field_get_div_fn(operand2); | |
2768 | } | |
2769 | ||
86087383 SRG |
2770 | expr->fn_num = op_fn; |
2771 | ||
f47716b7 KS |
2772 | if (combine_consts) { |
2773 | if (var1) | |
2774 | expr->operands[0] = var1; | |
2775 | if (var2) | |
2776 | expr->operands[1] = var2; | |
2c05caa7 | 2777 | |
86087383 SRG |
2778 | expr->constant = hist_fn_call(expr, NULL, NULL, NULL, NULL); |
2779 | expr->fn_num = HIST_FIELD_FN_CONST; | |
100719dc | 2780 | |
f47716b7 KS |
2781 | expr->operands[0] = NULL; |
2782 | expr->operands[1] = NULL; | |
2783 | ||
2784 | /* | |
2785 | * var refs won't be destroyed immediately | |
2786 | * See: destroy_hist_field() | |
2787 | */ | |
2788 | destroy_hist_field(operand2, 0); | |
2789 | destroy_hist_field(operand1, 0); | |
2790 | ||
2791 | expr->name = expr_str(expr, 0); | |
2792 | } else { | |
f47716b7 KS |
2793 | /* The operand sizes should be the same, so just pick one */ |
2794 | expr->size = operand1->size; | |
097f1eef | 2795 | expr->is_signed = operand1->is_signed; |
f47716b7 KS |
2796 | |
2797 | expr->operator = field_op; | |
2798 | expr->type = kstrdup_const(operand1->type, GFP_KERNEL); | |
2799 | if (!expr->type) { | |
2800 | ret = -ENOMEM; | |
f86b0aaa | 2801 | goto free_expr; |
f47716b7 KS |
2802 | } |
2803 | ||
2804 | expr->name = expr_str(expr, 0); | |
100719dc TZ |
2805 | } |
2806 | ||
2807 | return expr; | |
f86b0aaa KS |
2808 | |
2809 | free_operands: | |
100719dc | 2810 | destroy_hist_field(operand2, 0); |
f86b0aaa KS |
2811 | free_op1: |
2812 | destroy_hist_field(operand1, 0); | |
2813 | return ERR_PTR(ret); | |
100719dc | 2814 | |
f86b0aaa KS |
2815 | free_expr: |
2816 | destroy_hist_field(expr, 0); | |
100719dc TZ |
2817 | return ERR_PTR(ret); |
2818 | } | |
2819 | ||
02205a67 TZ |
2820 | static char *find_trigger_filter(struct hist_trigger_data *hist_data, |
2821 | struct trace_event_file *file) | |
2822 | { | |
2823 | struct event_trigger_data *test; | |
2824 | ||
aeed8aa3 MH |
2825 | lockdep_assert_held(&event_mutex); |
2826 | ||
2827 | list_for_each_entry(test, &file->triggers, list) { | |
02205a67 TZ |
2828 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
2829 | if (test->private_data == hist_data) | |
2830 | return test->filter_str; | |
2831 | } | |
2832 | } | |
2833 | ||
2834 | return NULL; | |
2835 | } | |
2836 | ||
2837 | static struct event_command trigger_hist_cmd; | |
9ec5a7d1 TZ |
2838 | static int event_hist_trigger_parse(struct event_command *cmd_ops, |
2839 | struct trace_event_file *file, | |
e1f187d0 TZ |
2840 | char *glob, char *cmd, |
2841 | char *param_and_filter); | |
02205a67 TZ |
2842 | |
2843 | static bool compatible_keys(struct hist_trigger_data *target_hist_data, | |
2844 | struct hist_trigger_data *hist_data, | |
2845 | unsigned int n_keys) | |
2846 | { | |
2847 | struct hist_field *target_hist_field, *hist_field; | |
2848 | unsigned int n, i, j; | |
2849 | ||
2850 | if (hist_data->n_fields - hist_data->n_vals != n_keys) | |
2851 | return false; | |
2852 | ||
2853 | i = hist_data->n_vals; | |
2854 | j = target_hist_data->n_vals; | |
2855 | ||
2856 | for (n = 0; n < n_keys; n++) { | |
2857 | hist_field = hist_data->fields[i + n]; | |
2858 | target_hist_field = target_hist_data->fields[j + n]; | |
2859 | ||
2860 | if (strcmp(hist_field->type, target_hist_field->type) != 0) | |
2861 | return false; | |
2862 | if (hist_field->size != target_hist_field->size) | |
2863 | return false; | |
2864 | if (hist_field->is_signed != target_hist_field->is_signed) | |
2865 | return false; | |
2866 | } | |
2867 | ||
2868 | return true; | |
2869 | } | |
2870 | ||
2871 | static struct hist_trigger_data * | |
2872 | find_compatible_hist(struct hist_trigger_data *target_hist_data, | |
2873 | struct trace_event_file *file) | |
2874 | { | |
2875 | struct hist_trigger_data *hist_data; | |
2876 | struct event_trigger_data *test; | |
2877 | unsigned int n_keys; | |
2878 | ||
aeed8aa3 MH |
2879 | lockdep_assert_held(&event_mutex); |
2880 | ||
02205a67 TZ |
2881 | n_keys = target_hist_data->n_fields - target_hist_data->n_vals; |
2882 | ||
aeed8aa3 | 2883 | list_for_each_entry(test, &file->triggers, list) { |
02205a67 TZ |
2884 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
2885 | hist_data = test->private_data; | |
2886 | ||
2887 | if (compatible_keys(target_hist_data, hist_data, n_keys)) | |
2888 | return hist_data; | |
2889 | } | |
2890 | } | |
2891 | ||
2892 | return NULL; | |
2893 | } | |
2894 | ||
2895 | static struct trace_event_file *event_file(struct trace_array *tr, | |
2896 | char *system, char *event_name) | |
2897 | { | |
2898 | struct trace_event_file *file; | |
2899 | ||
3be4c1e5 | 2900 | file = __find_event_file(tr, system, event_name); |
02205a67 TZ |
2901 | if (!file) |
2902 | return ERR_PTR(-EINVAL); | |
2903 | ||
2904 | return file; | |
2905 | } | |
2906 | ||
2907 | static struct hist_field * | |
2908 | find_synthetic_field_var(struct hist_trigger_data *target_hist_data, | |
2909 | char *system, char *event_name, char *field_name) | |
2910 | { | |
2911 | struct hist_field *event_var; | |
2912 | char *synthetic_name; | |
2913 | ||
2914 | synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); | |
2915 | if (!synthetic_name) | |
2916 | return ERR_PTR(-ENOMEM); | |
2917 | ||
2918 | strcpy(synthetic_name, "synthetic_"); | |
2919 | strcat(synthetic_name, field_name); | |
2920 | ||
2921 | event_var = find_event_var(target_hist_data, system, event_name, synthetic_name); | |
2922 | ||
2923 | kfree(synthetic_name); | |
2924 | ||
2925 | return event_var; | |
2926 | } | |
2927 | ||
2928 | /** | |
2929 | * create_field_var_hist - Automatically create a histogram and var for a field | |
2930 | * @target_hist_data: The target hist trigger | |
2931 | * @subsys_name: Optional subsystem name | |
2932 | * @event_name: Optional event name | |
2933 | * @field_name: The name of the field (and the resulting variable) | |
2934 | * | |
2935 | * Hist trigger actions fetch data from variables, not directly from | |
2936 | * events. However, for convenience, users are allowed to directly | |
2937 | * specify an event field in an action, which will be automatically | |
2938 | * converted into a variable on their behalf. | |
b26503b1 | 2939 | * |
02205a67 TZ |
2940 | * If a user specifies a field on an event that isn't the event the |
2941 | * histogram currently being defined (the target event histogram), the | |
2942 | * only way that can be accomplished is if a new hist trigger is | |
2943 | * created and the field variable defined on that. | |
2944 | * | |
2945 | * This function creates a new histogram compatible with the target | |
2946 | * event (meaning a histogram with the same key as the target | |
2947 | * histogram), and creates a variable for the specified field, but | |
2948 | * with 'synthetic_' prepended to the variable name in order to avoid | |
2949 | * collision with normal field variables. | |
2950 | * | |
2951 | * Return: The variable created for the field. | |
2952 | */ | |
c282a386 | 2953 | static struct hist_field * |
02205a67 TZ |
2954 | create_field_var_hist(struct hist_trigger_data *target_hist_data, |
2955 | char *subsys_name, char *event_name, char *field_name) | |
2956 | { | |
2957 | struct trace_array *tr = target_hist_data->event_file->tr; | |
02205a67 TZ |
2958 | struct hist_trigger_data *hist_data; |
2959 | unsigned int i, n, first = true; | |
2960 | struct field_var_hist *var_hist; | |
2961 | struct trace_event_file *file; | |
2962 | struct hist_field *key_field; | |
614db49c | 2963 | struct hist_field *event_var; |
02205a67 TZ |
2964 | char *saved_filter; |
2965 | char *cmd; | |
2966 | int ret; | |
2967 | ||
f404da6e | 2968 | if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) { |
d0cd871b | 2969 | hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name)); |
02205a67 | 2970 | return ERR_PTR(-EINVAL); |
f404da6e | 2971 | } |
02205a67 TZ |
2972 | |
2973 | file = event_file(tr, subsys_name, event_name); | |
2974 | ||
2975 | if (IS_ERR(file)) { | |
d0cd871b | 2976 | hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name)); |
02205a67 TZ |
2977 | ret = PTR_ERR(file); |
2978 | return ERR_PTR(ret); | |
2979 | } | |
2980 | ||
2981 | /* | |
2982 | * Look for a histogram compatible with target. We'll use the | |
2983 | * found histogram specification to create a new matching | |
2984 | * histogram with our variable on it. target_hist_data is not | |
2985 | * yet a registered histogram so we can't use that. | |
2986 | */ | |
2987 | hist_data = find_compatible_hist(target_hist_data, file); | |
f404da6e | 2988 | if (!hist_data) { |
d0cd871b | 2989 | hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name)); |
02205a67 | 2990 | return ERR_PTR(-EINVAL); |
f404da6e | 2991 | } |
02205a67 TZ |
2992 | |
2993 | /* See if a synthetic field variable has already been created */ | |
2994 | event_var = find_synthetic_field_var(target_hist_data, subsys_name, | |
2995 | event_name, field_name); | |
2996 | if (!IS_ERR_OR_NULL(event_var)) | |
2997 | return event_var; | |
2998 | ||
2999 | var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL); | |
3000 | if (!var_hist) | |
3001 | return ERR_PTR(-ENOMEM); | |
3002 | ||
3003 | cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); | |
3004 | if (!cmd) { | |
3005 | kfree(var_hist); | |
3006 | return ERR_PTR(-ENOMEM); | |
3007 | } | |
3008 | ||
3009 | /* Use the same keys as the compatible histogram */ | |
3010 | strcat(cmd, "keys="); | |
3011 | ||
3012 | for_each_hist_key_field(i, hist_data) { | |
3013 | key_field = hist_data->fields[i]; | |
3014 | if (!first) | |
3015 | strcat(cmd, ","); | |
3016 | strcat(cmd, key_field->field->name); | |
3017 | first = false; | |
3018 | } | |
3019 | ||
3020 | /* Create the synthetic field variable specification */ | |
3021 | strcat(cmd, ":synthetic_"); | |
3022 | strcat(cmd, field_name); | |
3023 | strcat(cmd, "="); | |
3024 | strcat(cmd, field_name); | |
3025 | ||
3026 | /* Use the same filter as the compatible histogram */ | |
3027 | saved_filter = find_trigger_filter(hist_data, file); | |
3028 | if (saved_filter) { | |
3029 | strcat(cmd, " if "); | |
3030 | strcat(cmd, saved_filter); | |
3031 | } | |
3032 | ||
3033 | var_hist->cmd = kstrdup(cmd, GFP_KERNEL); | |
3034 | if (!var_hist->cmd) { | |
3035 | kfree(cmd); | |
3036 | kfree(var_hist); | |
3037 | return ERR_PTR(-ENOMEM); | |
3038 | } | |
3039 | ||
3040 | /* Save the compatible histogram information */ | |
3041 | var_hist->hist_data = hist_data; | |
3042 | ||
3043 | /* Create the new histogram with our variable */ | |
9ec5a7d1 TZ |
3044 | ret = event_hist_trigger_parse(&trigger_hist_cmd, file, |
3045 | "", "hist", cmd); | |
02205a67 TZ |
3046 | if (ret) { |
3047 | kfree(cmd); | |
3048 | kfree(var_hist->cmd); | |
3049 | kfree(var_hist); | |
d0cd871b | 3050 | hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name)); |
02205a67 TZ |
3051 | return ERR_PTR(ret); |
3052 | } | |
3053 | ||
3054 | kfree(cmd); | |
3055 | ||
3056 | /* If we can't find the variable, something went wrong */ | |
3057 | event_var = find_synthetic_field_var(target_hist_data, subsys_name, | |
3058 | event_name, field_name); | |
3059 | if (IS_ERR_OR_NULL(event_var)) { | |
3060 | kfree(var_hist->cmd); | |
3061 | kfree(var_hist); | |
d0cd871b | 3062 | hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name)); |
02205a67 TZ |
3063 | return ERR_PTR(-EINVAL); |
3064 | } | |
3065 | ||
3066 | n = target_hist_data->n_field_var_hists; | |
3067 | target_hist_data->field_var_hists[n] = var_hist; | |
3068 | target_hist_data->n_field_var_hists++; | |
3069 | ||
3070 | return event_var; | |
3071 | } | |
3072 | ||
c282a386 | 3073 | static struct hist_field * |
02205a67 TZ |
3074 | find_target_event_var(struct hist_trigger_data *hist_data, |
3075 | char *subsys_name, char *event_name, char *var_name) | |
3076 | { | |
3077 | struct trace_event_file *file = hist_data->event_file; | |
3078 | struct hist_field *hist_field = NULL; | |
3079 | ||
3080 | if (subsys_name) { | |
3081 | struct trace_event_call *call; | |
3082 | ||
3083 | if (!event_name) | |
3084 | return NULL; | |
3085 | ||
3086 | call = file->event_call; | |
3087 | ||
3088 | if (strcmp(subsys_name, call->class->system) != 0) | |
3089 | return NULL; | |
3090 | ||
3091 | if (strcmp(event_name, trace_event_name(call)) != 0) | |
3092 | return NULL; | |
3093 | } | |
3094 | ||
3095 | hist_field = find_var_field(hist_data, var_name); | |
3096 | ||
3097 | return hist_field; | |
3098 | } | |
3099 | ||
3100 | static inline void __update_field_vars(struct tracing_map_elt *elt, | |
b47e3302 | 3101 | struct trace_buffer *buffer, |
02205a67 TZ |
3102 | struct ring_buffer_event *rbe, |
3103 | void *rec, | |
3104 | struct field_var **field_vars, | |
3105 | unsigned int n_field_vars, | |
3106 | unsigned int field_var_str_start) | |
3107 | { | |
3108 | struct hist_elt_data *elt_data = elt->private_data; | |
3109 | unsigned int i, j, var_idx; | |
3110 | u64 var_val; | |
3111 | ||
3112 | for (i = 0, j = field_var_str_start; i < n_field_vars; i++) { | |
3113 | struct field_var *field_var = field_vars[i]; | |
3114 | struct hist_field *var = field_var->var; | |
3115 | struct hist_field *val = field_var->val; | |
3116 | ||
86087383 | 3117 | var_val = hist_fn_call(val, elt, buffer, rbe, rec); |
02205a67 TZ |
3118 | var_idx = var->var.idx; |
3119 | ||
3120 | if (val->flags & HIST_FIELD_FL_STRING) { | |
3121 | char *str = elt_data->field_var_str[j++]; | |
3122 | char *val_str = (char *)(uintptr_t)var_val; | |
938aa33f | 3123 | unsigned int size; |
02205a67 | 3124 | |
938aa33f SRV |
3125 | size = min(val->size, STR_VAR_LEN_MAX); |
3126 | strscpy(str, val_str, size); | |
02205a67 TZ |
3127 | var_val = (u64)(uintptr_t)str; |
3128 | } | |
3129 | tracing_map_set_var(elt, var_idx, var_val); | |
3130 | } | |
3131 | } | |
3132 | ||
3133 | static void update_field_vars(struct hist_trigger_data *hist_data, | |
3134 | struct tracing_map_elt *elt, | |
b47e3302 | 3135 | struct trace_buffer *buffer, |
02205a67 TZ |
3136 | struct ring_buffer_event *rbe, |
3137 | void *rec) | |
3138 | { | |
b47e3302 | 3139 | __update_field_vars(elt, buffer, rbe, rec, hist_data->field_vars, |
02205a67 TZ |
3140 | hist_data->n_field_vars, 0); |
3141 | } | |
3142 | ||
466f4528 | 3143 | static void save_track_data_vars(struct hist_trigger_data *hist_data, |
b47e3302 SRV |
3144 | struct tracing_map_elt *elt, |
3145 | struct trace_buffer *buffer, void *rec, | |
466f4528 TZ |
3146 | struct ring_buffer_event *rbe, void *key, |
3147 | struct action_data *data, u64 *var_ref_vals) | |
50450603 | 3148 | { |
b47e3302 | 3149 | __update_field_vars(elt, buffer, rbe, rec, hist_data->save_vars, |
7d18a10c | 3150 | hist_data->n_save_vars, hist_data->n_field_var_str); |
50450603 TZ |
3151 | } |
3152 | ||
02205a67 TZ |
3153 | static struct hist_field *create_var(struct hist_trigger_data *hist_data, |
3154 | struct trace_event_file *file, | |
3155 | char *name, int size, const char *type) | |
3156 | { | |
3157 | struct hist_field *var; | |
3158 | int idx; | |
3159 | ||
3160 | if (find_var(hist_data, file, name) && !hist_data->remove) { | |
3161 | var = ERR_PTR(-EINVAL); | |
3162 | goto out; | |
3163 | } | |
3164 | ||
3165 | var = kzalloc(sizeof(struct hist_field), GFP_KERNEL); | |
3166 | if (!var) { | |
3167 | var = ERR_PTR(-ENOMEM); | |
3168 | goto out; | |
3169 | } | |
3170 | ||
3171 | idx = tracing_map_add_var(hist_data->map); | |
3172 | if (idx < 0) { | |
3173 | kfree(var); | |
3174 | var = ERR_PTR(-EINVAL); | |
3175 | goto out; | |
3176 | } | |
3177 | ||
9da73974 | 3178 | var->ref = 1; |
02205a67 TZ |
3179 | var->flags = HIST_FIELD_FL_VAR; |
3180 | var->var.idx = idx; | |
3181 | var->var.hist_data = var->hist_data = hist_data; | |
3182 | var->size = size; | |
3183 | var->var.name = kstrdup(name, GFP_KERNEL); | |
3347d80b | 3184 | var->type = kstrdup_const(type, GFP_KERNEL); |
02205a67 | 3185 | if (!var->var.name || !var->type) { |
3347d80b | 3186 | kfree_const(var->type); |
02205a67 | 3187 | kfree(var->var.name); |
02205a67 TZ |
3188 | kfree(var); |
3189 | var = ERR_PTR(-ENOMEM); | |
3190 | } | |
3191 | out: | |
3192 | return var; | |
3193 | } | |
3194 | ||
3195 | static struct field_var *create_field_var(struct hist_trigger_data *hist_data, | |
3196 | struct trace_event_file *file, | |
3197 | char *field_name) | |
3198 | { | |
3199 | struct hist_field *val = NULL, *var = NULL; | |
3200 | unsigned long flags = HIST_FIELD_FL_VAR; | |
d0cd871b | 3201 | struct trace_array *tr = file->tr; |
02205a67 TZ |
3202 | struct field_var *field_var; |
3203 | int ret = 0; | |
3204 | ||
3205 | if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) { | |
d0cd871b | 3206 | hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name)); |
02205a67 TZ |
3207 | ret = -EINVAL; |
3208 | goto err; | |
3209 | } | |
3210 | ||
3211 | val = parse_atom(hist_data, file, field_name, &flags, NULL); | |
3212 | if (IS_ERR(val)) { | |
d0cd871b | 3213 | hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name)); |
02205a67 TZ |
3214 | ret = PTR_ERR(val); |
3215 | goto err; | |
3216 | } | |
3217 | ||
3218 | var = create_var(hist_data, file, field_name, val->size, val->type); | |
3219 | if (IS_ERR(var)) { | |
d0cd871b | 3220 | hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name)); |
02205a67 TZ |
3221 | kfree(val); |
3222 | ret = PTR_ERR(var); | |
3223 | goto err; | |
3224 | } | |
3225 | ||
3226 | field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL); | |
3227 | if (!field_var) { | |
3228 | kfree(val); | |
3229 | kfree(var); | |
3230 | ret = -ENOMEM; | |
3231 | goto err; | |
3232 | } | |
3233 | ||
3234 | field_var->var = var; | |
3235 | field_var->val = val; | |
3236 | out: | |
3237 | return field_var; | |
3238 | err: | |
3239 | field_var = ERR_PTR(ret); | |
3240 | goto out; | |
3241 | } | |
3242 | ||
3243 | /** | |
3244 | * create_target_field_var - Automatically create a variable for a field | |
3245 | * @target_hist_data: The target hist trigger | |
3246 | * @subsys_name: Optional subsystem name | |
3247 | * @event_name: Optional event name | |
3248 | * @var_name: The name of the field (and the resulting variable) | |
3249 | * | |
3250 | * Hist trigger actions fetch data from variables, not directly from | |
3251 | * events. However, for convenience, users are allowed to directly | |
3252 | * specify an event field in an action, which will be automatically | |
3253 | * converted into a variable on their behalf. | |
0a068f4a | 3254 | * |
02205a67 TZ |
3255 | * This function creates a field variable with the name var_name on |
3256 | * the hist trigger currently being defined on the target event. If | |
3257 | * subsys_name and event_name are specified, this function simply | |
3258 | * verifies that they do in fact match the target event subsystem and | |
3259 | * event name. | |
3260 | * | |
3261 | * Return: The variable created for the field. | |
3262 | */ | |
c282a386 | 3263 | static struct field_var * |
02205a67 TZ |
3264 | create_target_field_var(struct hist_trigger_data *target_hist_data, |
3265 | char *subsys_name, char *event_name, char *var_name) | |
3266 | { | |
3267 | struct trace_event_file *file = target_hist_data->event_file; | |
3268 | ||
3269 | if (subsys_name) { | |
3270 | struct trace_event_call *call; | |
3271 | ||
3272 | if (!event_name) | |
3273 | return NULL; | |
3274 | ||
3275 | call = file->event_call; | |
3276 | ||
3277 | if (strcmp(subsys_name, call->class->system) != 0) | |
3278 | return NULL; | |
3279 | ||
3280 | if (strcmp(event_name, trace_event_name(call)) != 0) | |
3281 | return NULL; | |
3282 | } | |
3283 | ||
3284 | return create_field_var(target_hist_data, file, var_name); | |
3285 | } | |
3286 | ||
466f4528 TZ |
3287 | static bool check_track_val_max(u64 track_val, u64 var_val) |
3288 | { | |
3289 | if (var_val <= track_val) | |
3290 | return false; | |
3291 | ||
3292 | return true; | |
3293 | } | |
3294 | ||
dff81f55 TZ |
3295 | static bool check_track_val_changed(u64 track_val, u64 var_val) |
3296 | { | |
3297 | if (var_val == track_val) | |
3298 | return false; | |
3299 | ||
3300 | return true; | |
3301 | } | |
3302 | ||
466f4528 TZ |
3303 | static u64 get_track_val(struct hist_trigger_data *hist_data, |
3304 | struct tracing_map_elt *elt, | |
3305 | struct action_data *data) | |
50450603 | 3306 | { |
466f4528 TZ |
3307 | unsigned int track_var_idx = data->track_data.track_var->var.idx; |
3308 | u64 track_val; | |
3309 | ||
3310 | track_val = tracing_map_read_var(elt, track_var_idx); | |
50450603 | 3311 | |
466f4528 TZ |
3312 | return track_val; |
3313 | } | |
3314 | ||
3315 | static void save_track_val(struct hist_trigger_data *hist_data, | |
3316 | struct tracing_map_elt *elt, | |
3317 | struct action_data *data, u64 var_val) | |
3318 | { | |
3319 | unsigned int track_var_idx = data->track_data.track_var->var.idx; | |
3320 | ||
3321 | tracing_map_set_var(elt, track_var_idx, var_val); | |
3322 | } | |
3323 | ||
3324 | static void save_track_data(struct hist_trigger_data *hist_data, | |
b47e3302 SRV |
3325 | struct tracing_map_elt *elt, |
3326 | struct trace_buffer *buffer, void *rec, | |
466f4528 TZ |
3327 | struct ring_buffer_event *rbe, void *key, |
3328 | struct action_data *data, u64 *var_ref_vals) | |
3329 | { | |
3330 | if (data->track_data.save_data) | |
b47e3302 SRV |
3331 | data->track_data.save_data(hist_data, elt, buffer, rec, rbe, |
3332 | key, data, var_ref_vals); | |
466f4528 TZ |
3333 | } |
3334 | ||
3335 | static bool check_track_val(struct tracing_map_elt *elt, | |
3336 | struct action_data *data, | |
3337 | u64 var_val) | |
3338 | { | |
3339 | struct hist_trigger_data *hist_data; | |
3340 | u64 track_val; | |
3341 | ||
3342 | hist_data = data->track_data.track_var->hist_data; | |
3343 | track_val = get_track_val(hist_data, elt, data); | |
3344 | ||
3345 | return data->track_data.check_val(track_val, var_val); | |
3346 | } | |
3347 | ||
a3785b7e TZ |
3348 | #ifdef CONFIG_TRACER_SNAPSHOT |
3349 | static bool cond_snapshot_update(struct trace_array *tr, void *cond_data) | |
3350 | { | |
3351 | /* called with tr->max_lock held */ | |
3352 | struct track_data *track_data = tr->cond_snapshot->cond_data; | |
3353 | struct hist_elt_data *elt_data, *track_elt_data; | |
3354 | struct snapshot_context *context = cond_data; | |
9b2ca371 | 3355 | struct action_data *action; |
a3785b7e TZ |
3356 | u64 track_val; |
3357 | ||
3358 | if (!track_data) | |
3359 | return false; | |
3360 | ||
9b2ca371 TZ |
3361 | action = track_data->action_data; |
3362 | ||
a3785b7e TZ |
3363 | track_val = get_track_val(track_data->hist_data, context->elt, |
3364 | track_data->action_data); | |
3365 | ||
9b2ca371 TZ |
3366 | if (!action->track_data.check_val(track_data->track_val, track_val)) |
3367 | return false; | |
3368 | ||
a3785b7e TZ |
3369 | track_data->track_val = track_val; |
3370 | memcpy(track_data->key, context->key, track_data->key_len); | |
3371 | ||
3372 | elt_data = context->elt->private_data; | |
3373 | track_elt_data = track_data->elt.private_data; | |
3374 | if (elt_data->comm) | |
27242c62 | 3375 | strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN); |
a3785b7e TZ |
3376 | |
3377 | track_data->updated = true; | |
3378 | ||
3379 | return true; | |
3380 | } | |
3381 | ||
3382 | static void save_track_data_snapshot(struct hist_trigger_data *hist_data, | |
b47e3302 SRV |
3383 | struct tracing_map_elt *elt, |
3384 | struct trace_buffer *buffer, void *rec, | |
a3785b7e TZ |
3385 | struct ring_buffer_event *rbe, void *key, |
3386 | struct action_data *data, | |
3387 | u64 *var_ref_vals) | |
3388 | { | |
3389 | struct trace_event_file *file = hist_data->event_file; | |
3390 | struct snapshot_context context; | |
3391 | ||
3392 | context.elt = elt; | |
3393 | context.key = key; | |
3394 | ||
3395 | tracing_snapshot_cond(file->tr, &context); | |
3396 | } | |
3397 | ||
3398 | static void hist_trigger_print_key(struct seq_file *m, | |
3399 | struct hist_trigger_data *hist_data, | |
3400 | void *key, | |
3401 | struct tracing_map_elt *elt); | |
3402 | ||
3403 | static struct action_data *snapshot_action(struct hist_trigger_data *hist_data) | |
3404 | { | |
3405 | unsigned int i; | |
3406 | ||
3407 | if (!hist_data->n_actions) | |
3408 | return NULL; | |
3409 | ||
3410 | for (i = 0; i < hist_data->n_actions; i++) { | |
3411 | struct action_data *data = hist_data->actions[i]; | |
3412 | ||
3413 | if (data->action == ACTION_SNAPSHOT) | |
3414 | return data; | |
3415 | } | |
3416 | ||
3417 | return NULL; | |
3418 | } | |
3419 | ||
3420 | static void track_data_snapshot_print(struct seq_file *m, | |
3421 | struct hist_trigger_data *hist_data) | |
3422 | { | |
3423 | struct trace_event_file *file = hist_data->event_file; | |
3424 | struct track_data *track_data; | |
3425 | struct action_data *action; | |
3426 | ||
3427 | track_data = tracing_cond_snapshot_data(file->tr); | |
3428 | if (!track_data) | |
3429 | return; | |
3430 | ||
3431 | if (!track_data->updated) | |
3432 | return; | |
3433 | ||
3434 | action = snapshot_action(hist_data); | |
3435 | if (!action) | |
3436 | return; | |
3437 | ||
3438 | seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n"); | |
3439 | seq_printf(m, "\ttriggering value { %s(%s) }: %10llu", | |
3440 | action->handler == HANDLER_ONMAX ? "onmax" : "onchange", | |
3441 | action->track_data.var_str, track_data->track_val); | |
3442 | ||
3443 | seq_puts(m, "\ttriggered by event with key: "); | |
3444 | hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt); | |
3445 | seq_putc(m, '\n'); | |
3446 | } | |
3447 | #else | |
3448 | static bool cond_snapshot_update(struct trace_array *tr, void *cond_data) | |
3449 | { | |
3450 | return false; | |
3451 | } | |
3452 | static void save_track_data_snapshot(struct hist_trigger_data *hist_data, | |
b47e3302 SRV |
3453 | struct tracing_map_elt *elt, |
3454 | struct trace_buffer *buffer, void *rec, | |
a3785b7e TZ |
3455 | struct ring_buffer_event *rbe, void *key, |
3456 | struct action_data *data, | |
3457 | u64 *var_ref_vals) {} | |
3458 | static void track_data_snapshot_print(struct seq_file *m, | |
3459 | struct hist_trigger_data *hist_data) {} | |
3460 | #endif /* CONFIG_TRACER_SNAPSHOT */ | |
3461 | ||
466f4528 TZ |
3462 | static void track_data_print(struct seq_file *m, |
3463 | struct hist_trigger_data *hist_data, | |
3464 | struct tracing_map_elt *elt, | |
3465 | struct action_data *data) | |
3466 | { | |
3467 | u64 track_val = get_track_val(hist_data, elt, data); | |
3468 | unsigned int i, save_var_idx; | |
3469 | ||
3470 | if (data->handler == HANDLER_ONMAX) | |
3471 | seq_printf(m, "\n\tmax: %10llu", track_val); | |
dff81f55 TZ |
3472 | else if (data->handler == HANDLER_ONCHANGE) |
3473 | seq_printf(m, "\n\tchanged: %10llu", track_val); | |
50450603 | 3474 | |
a3785b7e TZ |
3475 | if (data->action == ACTION_SNAPSHOT) |
3476 | return; | |
3477 | ||
7d18a10c TZ |
3478 | for (i = 0; i < hist_data->n_save_vars; i++) { |
3479 | struct hist_field *save_val = hist_data->save_vars[i]->val; | |
3480 | struct hist_field *save_var = hist_data->save_vars[i]->var; | |
50450603 TZ |
3481 | u64 val; |
3482 | ||
3483 | save_var_idx = save_var->var.idx; | |
3484 | ||
3485 | val = tracing_map_read_var(elt, save_var_idx); | |
3486 | ||
3487 | if (save_val->flags & HIST_FIELD_FL_STRING) { | |
3488 | seq_printf(m, " %s: %-32s", save_var->var.name, | |
3489 | (char *)(uintptr_t)(val)); | |
3490 | } else | |
3491 | seq_printf(m, " %s: %10llu", save_var->var.name, val); | |
3492 | } | |
3493 | } | |
3494 | ||
466f4528 | 3495 | static void ontrack_action(struct hist_trigger_data *hist_data, |
b47e3302 SRV |
3496 | struct tracing_map_elt *elt, |
3497 | struct trace_buffer *buffer, void *rec, | |
466f4528 TZ |
3498 | struct ring_buffer_event *rbe, void *key, |
3499 | struct action_data *data, u64 *var_ref_vals) | |
50450603 | 3500 | { |
466f4528 | 3501 | u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx]; |
50450603 | 3502 | |
466f4528 TZ |
3503 | if (check_track_val(elt, data, var_val)) { |
3504 | save_track_val(hist_data, elt, data, var_val); | |
b47e3302 SRV |
3505 | save_track_data(hist_data, elt, buffer, rec, rbe, |
3506 | key, data, var_ref_vals); | |
466f4528 | 3507 | } |
50450603 TZ |
3508 | } |
3509 | ||
c3e49506 | 3510 | static void action_data_destroy(struct action_data *data) |
50450603 TZ |
3511 | { |
3512 | unsigned int i; | |
3513 | ||
c3e49506 | 3514 | lockdep_assert_held(&event_mutex); |
50450603 | 3515 | |
7d18a10c | 3516 | kfree(data->action_name); |
50450603 TZ |
3517 | |
3518 | for (i = 0; i < data->n_params; i++) | |
3519 | kfree(data->params[i]); | |
3520 | ||
c3e49506 TZ |
3521 | if (data->synth_event) |
3522 | data->synth_event->ref--; | |
3523 | ||
e91eefd7 TZ |
3524 | kfree(data->synth_event_name); |
3525 | ||
50450603 TZ |
3526 | kfree(data); |
3527 | } | |
3528 | ||
466f4528 TZ |
3529 | static void track_data_destroy(struct hist_trigger_data *hist_data, |
3530 | struct action_data *data) | |
c3e49506 | 3531 | { |
a3785b7e TZ |
3532 | struct trace_event_file *file = hist_data->event_file; |
3533 | ||
466f4528 | 3534 | destroy_hist_field(data->track_data.track_var, 0); |
c3e49506 | 3535 | |
a3785b7e TZ |
3536 | if (data->action == ACTION_SNAPSHOT) { |
3537 | struct track_data *track_data; | |
3538 | ||
3539 | track_data = tracing_cond_snapshot_data(file->tr); | |
3540 | if (track_data && track_data->hist_data == hist_data) { | |
3541 | tracing_snapshot_cond_disable(file->tr); | |
3542 | track_data_free(track_data); | |
3543 | } | |
3544 | } | |
3545 | ||
466f4528 | 3546 | kfree(data->track_data.var_str); |
c3e49506 TZ |
3547 | |
3548 | action_data_destroy(data); | |
3549 | } | |
3550 | ||
7d18a10c TZ |
3551 | static int action_create(struct hist_trigger_data *hist_data, |
3552 | struct action_data *data); | |
3553 | ||
466f4528 TZ |
3554 | static int track_data_create(struct hist_trigger_data *hist_data, |
3555 | struct action_data *data) | |
50450603 | 3556 | { |
466f4528 | 3557 | struct hist_field *var_field, *ref_field, *track_var = NULL; |
50450603 | 3558 | struct trace_event_file *file = hist_data->event_file; |
d0cd871b | 3559 | struct trace_array *tr = file->tr; |
466f4528 | 3560 | char *track_data_var_str; |
50450603 TZ |
3561 | int ret = 0; |
3562 | ||
466f4528 TZ |
3563 | track_data_var_str = data->track_data.var_str; |
3564 | if (track_data_var_str[0] != '$') { | |
d0cd871b | 3565 | hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str)); |
50450603 | 3566 | return -EINVAL; |
f404da6e | 3567 | } |
466f4528 | 3568 | track_data_var_str++; |
50450603 | 3569 | |
466f4528 | 3570 | var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str); |
f404da6e | 3571 | if (!var_field) { |
d0cd871b | 3572 | hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str)); |
50450603 | 3573 | return -EINVAL; |
f404da6e | 3574 | } |
50450603 | 3575 | |
de40f033 | 3576 | ref_field = create_var_ref(hist_data, var_field, NULL, NULL); |
50450603 TZ |
3577 | if (!ref_field) |
3578 | return -ENOMEM; | |
3579 | ||
466f4528 | 3580 | data->track_data.var_ref = ref_field; |
50450603 | 3581 | |
466f4528 TZ |
3582 | if (data->handler == HANDLER_ONMAX) |
3583 | track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64"); | |
3584 | if (IS_ERR(track_var)) { | |
d0cd871b | 3585 | hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0); |
466f4528 | 3586 | ret = PTR_ERR(track_var); |
50450603 TZ |
3587 | goto out; |
3588 | } | |
dff81f55 TZ |
3589 | |
3590 | if (data->handler == HANDLER_ONCHANGE) | |
3591 | track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64"); | |
3592 | if (IS_ERR(track_var)) { | |
d0cd871b | 3593 | hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0); |
dff81f55 TZ |
3594 | ret = PTR_ERR(track_var); |
3595 | goto out; | |
3596 | } | |
466f4528 | 3597 | data->track_data.track_var = track_var; |
50450603 | 3598 | |
7d18a10c | 3599 | ret = action_create(hist_data, data); |
50450603 TZ |
3600 | out: |
3601 | return ret; | |
3602 | } | |
3603 | ||
d0cd871b SRV |
3604 | static int parse_action_params(struct trace_array *tr, char *params, |
3605 | struct action_data *data) | |
50450603 TZ |
3606 | { |
3607 | char *param, *saved_param; | |
e91eefd7 | 3608 | bool first_param = true; |
50450603 TZ |
3609 | int ret = 0; |
3610 | ||
3611 | while (params) { | |
7d18a10c | 3612 | if (data->n_params >= SYNTH_FIELDS_MAX) { |
d0cd871b | 3613 | hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0); |
2cc6a528 | 3614 | ret = -EINVAL; |
50450603 | 3615 | goto out; |
7d18a10c | 3616 | } |
50450603 TZ |
3617 | |
3618 | param = strsep(¶ms, ","); | |
3619 | if (!param) { | |
d0cd871b | 3620 | hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0); |
50450603 TZ |
3621 | ret = -EINVAL; |
3622 | goto out; | |
3623 | } | |
3624 | ||
3625 | param = strstrip(param); | |
3626 | if (strlen(param) < 2) { | |
d0cd871b | 3627 | hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param)); |
50450603 TZ |
3628 | ret = -EINVAL; |
3629 | goto out; | |
3630 | } | |
3631 | ||
3632 | saved_param = kstrdup(param, GFP_KERNEL); | |
3633 | if (!saved_param) { | |
3634 | ret = -ENOMEM; | |
3635 | goto out; | |
3636 | } | |
3637 | ||
e91eefd7 TZ |
3638 | if (first_param && data->use_trace_keyword) { |
3639 | data->synth_event_name = saved_param; | |
3640 | first_param = false; | |
3641 | continue; | |
3642 | } | |
3643 | first_param = false; | |
3644 | ||
50450603 TZ |
3645 | data->params[data->n_params++] = saved_param; |
3646 | } | |
3647 | out: | |
3648 | return ret; | |
3649 | } | |
3650 | ||
d0cd871b | 3651 | static int action_parse(struct trace_array *tr, char *str, struct action_data *data, |
7d18a10c TZ |
3652 | enum handler_id handler) |
3653 | { | |
3654 | char *action_name; | |
3655 | int ret = 0; | |
3656 | ||
3657 | strsep(&str, "."); | |
3658 | if (!str) { | |
d0cd871b | 3659 | hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0); |
7d18a10c TZ |
3660 | ret = -EINVAL; |
3661 | goto out; | |
3662 | } | |
3663 | ||
3664 | action_name = strsep(&str, "("); | |
3665 | if (!action_name || !str) { | |
d0cd871b | 3666 | hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0); |
7d18a10c TZ |
3667 | ret = -EINVAL; |
3668 | goto out; | |
3669 | } | |
3670 | ||
3671 | if (str_has_prefix(action_name, "save")) { | |
3672 | char *params = strsep(&str, ")"); | |
3673 | ||
3674 | if (!params) { | |
d0cd871b | 3675 | hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0); |
7d18a10c TZ |
3676 | ret = -EINVAL; |
3677 | goto out; | |
3678 | } | |
3679 | ||
d0cd871b | 3680 | ret = parse_action_params(tr, params, data); |
7d18a10c TZ |
3681 | if (ret) |
3682 | goto out; | |
3683 | ||
3684 | if (handler == HANDLER_ONMAX) | |
466f4528 | 3685 | data->track_data.check_val = check_track_val_max; |
dff81f55 TZ |
3686 | else if (handler == HANDLER_ONCHANGE) |
3687 | data->track_data.check_val = check_track_val_changed; | |
466f4528 | 3688 | else { |
d0cd871b | 3689 | hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name)); |
466f4528 TZ |
3690 | ret = -EINVAL; |
3691 | goto out; | |
3692 | } | |
7d18a10c | 3693 | |
466f4528 TZ |
3694 | data->track_data.save_data = save_track_data_vars; |
3695 | data->fn = ontrack_action; | |
7d18a10c | 3696 | data->action = ACTION_SAVE; |
a3785b7e TZ |
3697 | } else if (str_has_prefix(action_name, "snapshot")) { |
3698 | char *params = strsep(&str, ")"); | |
3699 | ||
3700 | if (!str) { | |
d0cd871b | 3701 | hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params)); |
a3785b7e TZ |
3702 | ret = -EINVAL; |
3703 | goto out; | |
3704 | } | |
3705 | ||
3706 | if (handler == HANDLER_ONMAX) | |
3707 | data->track_data.check_val = check_track_val_max; | |
dff81f55 TZ |
3708 | else if (handler == HANDLER_ONCHANGE) |
3709 | data->track_data.check_val = check_track_val_changed; | |
a3785b7e | 3710 | else { |
d0cd871b | 3711 | hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name)); |
a3785b7e TZ |
3712 | ret = -EINVAL; |
3713 | goto out; | |
3714 | } | |
3715 | ||
3716 | data->track_data.save_data = save_track_data_snapshot; | |
3717 | data->fn = ontrack_action; | |
3718 | data->action = ACTION_SNAPSHOT; | |
7d18a10c TZ |
3719 | } else { |
3720 | char *params = strsep(&str, ")"); | |
3721 | ||
e91eefd7 TZ |
3722 | if (str_has_prefix(action_name, "trace")) |
3723 | data->use_trace_keyword = true; | |
3724 | ||
7d18a10c | 3725 | if (params) { |
d0cd871b | 3726 | ret = parse_action_params(tr, params, data); |
7d18a10c TZ |
3727 | if (ret) |
3728 | goto out; | |
3729 | } | |
3730 | ||
466f4528 TZ |
3731 | if (handler == HANDLER_ONMAX) |
3732 | data->track_data.check_val = check_track_val_max; | |
dff81f55 TZ |
3733 | else if (handler == HANDLER_ONCHANGE) |
3734 | data->track_data.check_val = check_track_val_changed; | |
466f4528 TZ |
3735 | |
3736 | if (handler != HANDLER_ONMATCH) { | |
3737 | data->track_data.save_data = action_trace; | |
3738 | data->fn = ontrack_action; | |
3739 | } else | |
3740 | data->fn = action_trace; | |
3741 | ||
7d18a10c TZ |
3742 | data->action = ACTION_TRACE; |
3743 | } | |
3744 | ||
3745 | data->action_name = kstrdup(action_name, GFP_KERNEL); | |
3746 | if (!data->action_name) { | |
3747 | ret = -ENOMEM; | |
3748 | goto out; | |
3749 | } | |
3750 | ||
3751 | data->handler = handler; | |
3752 | out: | |
3753 | return ret; | |
3754 | } | |
3755 | ||
466f4528 TZ |
3756 | static struct action_data *track_data_parse(struct hist_trigger_data *hist_data, |
3757 | char *str, enum handler_id handler) | |
50450603 | 3758 | { |
50450603 TZ |
3759 | struct action_data *data; |
3760 | int ret = -EINVAL; | |
466f4528 | 3761 | char *var_str; |
50450603 TZ |
3762 | |
3763 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
3764 | if (!data) | |
3765 | return ERR_PTR(-ENOMEM); | |
3766 | ||
466f4528 TZ |
3767 | var_str = strsep(&str, ")"); |
3768 | if (!var_str || !str) { | |
50450603 TZ |
3769 | ret = -EINVAL; |
3770 | goto free; | |
3771 | } | |
3772 | ||
466f4528 TZ |
3773 | data->track_data.var_str = kstrdup(var_str, GFP_KERNEL); |
3774 | if (!data->track_data.var_str) { | |
50450603 TZ |
3775 | ret = -ENOMEM; |
3776 | goto free; | |
3777 | } | |
3778 | ||
d0cd871b | 3779 | ret = action_parse(hist_data->event_file->tr, str, data, handler); |
7d18a10c | 3780 | if (ret) |
50450603 | 3781 | goto free; |
50450603 TZ |
3782 | out: |
3783 | return data; | |
3784 | free: | |
466f4528 | 3785 | track_data_destroy(hist_data, data); |
50450603 TZ |
3786 | data = ERR_PTR(ret); |
3787 | goto out; | |
3788 | } | |
3789 | ||
c282a386 TZ |
3790 | static void onmatch_destroy(struct action_data *data) |
3791 | { | |
c3e49506 TZ |
3792 | kfree(data->match_data.event); |
3793 | kfree(data->match_data.event_system); | |
c282a386 | 3794 | |
c3e49506 | 3795 | action_data_destroy(data); |
c282a386 TZ |
3796 | } |
3797 | ||
02205a67 TZ |
3798 | static void destroy_field_var(struct field_var *field_var) |
3799 | { | |
3800 | if (!field_var) | |
3801 | return; | |
3802 | ||
3803 | destroy_hist_field(field_var->var, 0); | |
3804 | destroy_hist_field(field_var->val, 0); | |
3805 | ||
3806 | kfree(field_var); | |
3807 | } | |
3808 | ||
3809 | static void destroy_field_vars(struct hist_trigger_data *hist_data) | |
3810 | { | |
3811 | unsigned int i; | |
3812 | ||
3813 | for (i = 0; i < hist_data->n_field_vars; i++) | |
3814 | destroy_field_var(hist_data->field_vars[i]); | |
9da73974 VS |
3815 | |
3816 | for (i = 0; i < hist_data->n_save_vars; i++) | |
3817 | destroy_field_var(hist_data->save_vars[i]); | |
02205a67 TZ |
3818 | } |
3819 | ||
c282a386 TZ |
3820 | static void save_field_var(struct hist_trigger_data *hist_data, |
3821 | struct field_var *field_var) | |
02205a67 TZ |
3822 | { |
3823 | hist_data->field_vars[hist_data->n_field_vars++] = field_var; | |
3824 | ||
3825 | if (field_var->val->flags & HIST_FIELD_FL_STRING) | |
3826 | hist_data->n_field_var_str++; | |
3827 | } | |
3828 | ||
c282a386 | 3829 | |
c282a386 TZ |
3830 | static int check_synth_field(struct synth_event *event, |
3831 | struct hist_field *hist_field, | |
3832 | unsigned int field_pos) | |
3833 | { | |
3834 | struct synth_field *field; | |
3835 | ||
3836 | if (field_pos >= event->n_fields) | |
3837 | return -EINVAL; | |
3838 | ||
3839 | field = event->fields[field_pos]; | |
3840 | ||
bd82631d TZ |
3841 | /* |
3842 | * A dynamic string synth field can accept static or | |
3843 | * dynamic. A static string synth field can only accept a | |
3844 | * same-sized static string, which is checked for later. | |
3845 | */ | |
3846 | if (strstr(hist_field->type, "char[") && field->is_string | |
3847 | && field->is_dynamic) | |
3848 | return 0; | |
3849 | ||
b05e89ae MH |
3850 | if (strcmp(field->type, hist_field->type) != 0) { |
3851 | if (field->size != hist_field->size || | |
450fec13 | 3852 | (!field->is_string && field->is_signed != hist_field->is_signed)) |
b05e89ae MH |
3853 | return -EINVAL; |
3854 | } | |
c282a386 TZ |
3855 | |
3856 | return 0; | |
3857 | } | |
3858 | ||
c282a386 | 3859 | static struct hist_field * |
7d18a10c TZ |
3860 | trace_action_find_var(struct hist_trigger_data *hist_data, |
3861 | struct action_data *data, | |
3862 | char *system, char *event, char *var) | |
c282a386 | 3863 | { |
d0cd871b | 3864 | struct trace_array *tr = hist_data->event_file->tr; |
c282a386 TZ |
3865 | struct hist_field *hist_field; |
3866 | ||
3867 | var++; /* skip '$' */ | |
3868 | ||
3869 | hist_field = find_target_event_var(hist_data, system, event, var); | |
3870 | if (!hist_field) { | |
7d18a10c | 3871 | if (!system && data->handler == HANDLER_ONMATCH) { |
c3e49506 TZ |
3872 | system = data->match_data.event_system; |
3873 | event = data->match_data.event; | |
c282a386 TZ |
3874 | } |
3875 | ||
3876 | hist_field = find_event_var(hist_data, system, event, var); | |
3877 | } | |
3878 | ||
f404da6e | 3879 | if (!hist_field) |
d0cd871b | 3880 | hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var)); |
f404da6e | 3881 | |
c282a386 TZ |
3882 | return hist_field; |
3883 | } | |
3884 | ||
3885 | static struct hist_field * | |
7d18a10c TZ |
3886 | trace_action_create_field_var(struct hist_trigger_data *hist_data, |
3887 | struct action_data *data, char *system, | |
3888 | char *event, char *var) | |
c282a386 TZ |
3889 | { |
3890 | struct hist_field *hist_field = NULL; | |
3891 | struct field_var *field_var; | |
3892 | ||
3893 | /* | |
3894 | * First try to create a field var on the target event (the | |
3895 | * currently being defined). This will create a variable for | |
3896 | * unqualified fields on the target event, or if qualified, | |
3897 | * target fields that have qualified names matching the target. | |
3898 | */ | |
3899 | field_var = create_target_field_var(hist_data, system, event, var); | |
3900 | ||
3901 | if (field_var && !IS_ERR(field_var)) { | |
3902 | save_field_var(hist_data, field_var); | |
3903 | hist_field = field_var->var; | |
3904 | } else { | |
3905 | field_var = NULL; | |
3906 | /* | |
2b5894cc | 3907 | * If no explicit system.event is specified, default to |
c282a386 TZ |
3908 | * looking for fields on the onmatch(system.event.xxx) |
3909 | * event. | |
3910 | */ | |
7d18a10c | 3911 | if (!system && data->handler == HANDLER_ONMATCH) { |
c3e49506 TZ |
3912 | system = data->match_data.event_system; |
3913 | event = data->match_data.event; | |
c282a386 TZ |
3914 | } |
3915 | ||
5acce0bf SRV |
3916 | if (!event) |
3917 | goto free; | |
c282a386 TZ |
3918 | /* |
3919 | * At this point, we're looking at a field on another | |
3920 | * event. Because we can't modify a hist trigger on | |
3921 | * another event to add a variable for a field, we need | |
3922 | * to create a new trigger on that event and create the | |
3923 | * variable at the same time. | |
3924 | */ | |
3925 | hist_field = create_field_var_hist(hist_data, system, event, var); | |
3926 | if (IS_ERR(hist_field)) | |
3927 | goto free; | |
3928 | } | |
3929 | out: | |
3930 | return hist_field; | |
3931 | free: | |
3932 | destroy_field_var(field_var); | |
3933 | hist_field = NULL; | |
3934 | goto out; | |
3935 | } | |
3936 | ||
7d18a10c TZ |
3937 | static int trace_action_create(struct hist_trigger_data *hist_data, |
3938 | struct action_data *data) | |
c282a386 | 3939 | { |
d0cd871b | 3940 | struct trace_array *tr = hist_data->event_file->tr; |
c282a386 TZ |
3941 | char *event_name, *param, *system = NULL; |
3942 | struct hist_field *hist_field, *var_ref; | |
d380dcde | 3943 | unsigned int i; |
c282a386 TZ |
3944 | unsigned int field_pos = 0; |
3945 | struct synth_event *event; | |
e91eefd7 | 3946 | char *synth_event_name; |
d380dcde | 3947 | int var_ref_idx, ret = 0; |
c282a386 | 3948 | |
0e2b81f7 MH |
3949 | lockdep_assert_held(&event_mutex); |
3950 | ||
82470f7d ZY |
3951 | /* Sanity check to avoid out-of-bound write on 'data->var_ref_idx' */ |
3952 | if (data->n_params > SYNTH_FIELDS_MAX) | |
3953 | return -EINVAL; | |
3954 | ||
e91eefd7 TZ |
3955 | if (data->use_trace_keyword) |
3956 | synth_event_name = data->synth_event_name; | |
3957 | else | |
3958 | synth_event_name = data->action_name; | |
3959 | ||
3960 | event = find_synth_event(synth_event_name); | |
c282a386 | 3961 | if (!event) { |
d0cd871b | 3962 | hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name)); |
c282a386 TZ |
3963 | return -EINVAL; |
3964 | } | |
7d18a10c | 3965 | |
c282a386 | 3966 | event->ref++; |
c282a386 | 3967 | |
c282a386 TZ |
3968 | for (i = 0; i < data->n_params; i++) { |
3969 | char *p; | |
3970 | ||
3971 | p = param = kstrdup(data->params[i], GFP_KERNEL); | |
3972 | if (!param) { | |
3973 | ret = -ENOMEM; | |
3974 | goto err; | |
3975 | } | |
3976 | ||
3977 | system = strsep(¶m, "."); | |
3978 | if (!param) { | |
3979 | param = (char *)system; | |
3980 | system = event_name = NULL; | |
3981 | } else { | |
3982 | event_name = strsep(¶m, "."); | |
3983 | if (!param) { | |
3984 | kfree(p); | |
3985 | ret = -EINVAL; | |
3986 | goto err; | |
3987 | } | |
3988 | } | |
3989 | ||
3990 | if (param[0] == '$') | |
7d18a10c TZ |
3991 | hist_field = trace_action_find_var(hist_data, data, |
3992 | system, event_name, | |
3993 | param); | |
c282a386 | 3994 | else |
7d18a10c TZ |
3995 | hist_field = trace_action_create_field_var(hist_data, |
3996 | data, | |
3997 | system, | |
3998 | event_name, | |
3999 | param); | |
c282a386 TZ |
4000 | |
4001 | if (!hist_field) { | |
4002 | kfree(p); | |
4003 | ret = -EINVAL; | |
4004 | goto err; | |
4005 | } | |
4006 | ||
4007 | if (check_synth_field(event, hist_field, field_pos) == 0) { | |
de40f033 TZ |
4008 | var_ref = create_var_ref(hist_data, hist_field, |
4009 | system, event_name); | |
c282a386 TZ |
4010 | if (!var_ref) { |
4011 | kfree(p); | |
4012 | ret = -ENOMEM; | |
4013 | goto err; | |
4014 | } | |
4015 | ||
d380dcde TZ |
4016 | var_ref_idx = find_var_ref_idx(hist_data, var_ref); |
4017 | if (WARN_ON(var_ref_idx < 0)) { | |
e629e7b5 | 4018 | kfree(p); |
d380dcde TZ |
4019 | ret = var_ref_idx; |
4020 | goto err; | |
4021 | } | |
4022 | ||
4023 | data->var_ref_idx[i] = var_ref_idx; | |
4024 | ||
c282a386 TZ |
4025 | field_pos++; |
4026 | kfree(p); | |
4027 | continue; | |
4028 | } | |
4029 | ||
d0cd871b | 4030 | hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param)); |
c282a386 TZ |
4031 | kfree(p); |
4032 | ret = -EINVAL; | |
4033 | goto err; | |
4034 | } | |
4035 | ||
4036 | if (field_pos != event->n_fields) { | |
d0cd871b | 4037 | hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name)); |
c282a386 TZ |
4038 | ret = -EINVAL; |
4039 | goto err; | |
4040 | } | |
4041 | ||
c3e49506 | 4042 | data->synth_event = event; |
c282a386 TZ |
4043 | out: |
4044 | return ret; | |
4045 | err: | |
c282a386 | 4046 | event->ref--; |
c282a386 TZ |
4047 | |
4048 | goto out; | |
4049 | } | |
4050 | ||
7d18a10c TZ |
4051 | static int action_create(struct hist_trigger_data *hist_data, |
4052 | struct action_data *data) | |
4053 | { | |
a3785b7e | 4054 | struct trace_event_file *file = hist_data->event_file; |
d0cd871b | 4055 | struct trace_array *tr = file->tr; |
a3785b7e | 4056 | struct track_data *track_data; |
7d18a10c TZ |
4057 | struct field_var *field_var; |
4058 | unsigned int i; | |
4059 | char *param; | |
4060 | int ret = 0; | |
4061 | ||
4062 | if (data->action == ACTION_TRACE) | |
4063 | return trace_action_create(hist_data, data); | |
4064 | ||
a3785b7e TZ |
4065 | if (data->action == ACTION_SNAPSHOT) { |
4066 | track_data = track_data_alloc(hist_data->key_size, data, hist_data); | |
4067 | if (IS_ERR(track_data)) { | |
4068 | ret = PTR_ERR(track_data); | |
4069 | goto out; | |
4070 | } | |
4071 | ||
4072 | ret = tracing_snapshot_cond_enable(file->tr, track_data, | |
4073 | cond_snapshot_update); | |
4074 | if (ret) | |
4075 | track_data_free(track_data); | |
4076 | ||
4077 | goto out; | |
4078 | } | |
4079 | ||
7d18a10c TZ |
4080 | if (data->action == ACTION_SAVE) { |
4081 | if (hist_data->n_save_vars) { | |
4082 | ret = -EEXIST; | |
d0cd871b | 4083 | hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0); |
7d18a10c TZ |
4084 | goto out; |
4085 | } | |
4086 | ||
4087 | for (i = 0; i < data->n_params; i++) { | |
4088 | param = kstrdup(data->params[i], GFP_KERNEL); | |
4089 | if (!param) { | |
4090 | ret = -ENOMEM; | |
4091 | goto out; | |
4092 | } | |
4093 | ||
4094 | field_var = create_target_field_var(hist_data, NULL, NULL, param); | |
4095 | if (IS_ERR(field_var)) { | |
d0cd871b SRV |
4096 | hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL, |
4097 | errpos(param)); | |
7d18a10c TZ |
4098 | ret = PTR_ERR(field_var); |
4099 | kfree(param); | |
4100 | goto out; | |
4101 | } | |
4102 | ||
4103 | hist_data->save_vars[hist_data->n_save_vars++] = field_var; | |
4104 | if (field_var->val->flags & HIST_FIELD_FL_STRING) | |
4105 | hist_data->n_save_var_str++; | |
4106 | kfree(param); | |
4107 | } | |
4108 | } | |
4109 | out: | |
4110 | return ret; | |
4111 | } | |
4112 | ||
4113 | static int onmatch_create(struct hist_trigger_data *hist_data, | |
4114 | struct action_data *data) | |
4115 | { | |
4116 | return action_create(hist_data, data); | |
4117 | } | |
4118 | ||
c282a386 TZ |
4119 | static struct action_data *onmatch_parse(struct trace_array *tr, char *str) |
4120 | { | |
4121 | char *match_event, *match_event_system; | |
c282a386 TZ |
4122 | struct action_data *data; |
4123 | int ret = -EINVAL; | |
4124 | ||
4125 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
4126 | if (!data) | |
4127 | return ERR_PTR(-ENOMEM); | |
4128 | ||
4129 | match_event = strsep(&str, ")"); | |
f404da6e | 4130 | if (!match_event || !str) { |
d0cd871b | 4131 | hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event)); |
c282a386 | 4132 | goto free; |
f404da6e | 4133 | } |
c282a386 TZ |
4134 | |
4135 | match_event_system = strsep(&match_event, "."); | |
f404da6e | 4136 | if (!match_event) { |
d0cd871b | 4137 | hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system)); |
c282a386 | 4138 | goto free; |
f404da6e | 4139 | } |
c282a386 | 4140 | |
f404da6e | 4141 | if (IS_ERR(event_file(tr, match_event_system, match_event))) { |
d0cd871b | 4142 | hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event)); |
c282a386 | 4143 | goto free; |
f404da6e | 4144 | } |
c282a386 | 4145 | |
c3e49506 TZ |
4146 | data->match_data.event = kstrdup(match_event, GFP_KERNEL); |
4147 | if (!data->match_data.event) { | |
c282a386 TZ |
4148 | ret = -ENOMEM; |
4149 | goto free; | |
4150 | } | |
4151 | ||
c3e49506 TZ |
4152 | data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL); |
4153 | if (!data->match_data.event_system) { | |
c282a386 TZ |
4154 | ret = -ENOMEM; |
4155 | goto free; | |
4156 | } | |
4157 | ||
d0cd871b | 4158 | ret = action_parse(tr, str, data, HANDLER_ONMATCH); |
c282a386 TZ |
4159 | if (ret) |
4160 | goto free; | |
4161 | out: | |
4162 | return data; | |
4163 | free: | |
4164 | onmatch_destroy(data); | |
4165 | data = ERR_PTR(ret); | |
4166 | goto out; | |
4167 | } | |
4168 | ||
7ef224d1 TZ |
4169 | static int create_hitcount_val(struct hist_trigger_data *hist_data) |
4170 | { | |
4171 | hist_data->fields[HITCOUNT_IDX] = | |
30350d65 | 4172 | create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL); |
7ef224d1 TZ |
4173 | if (!hist_data->fields[HITCOUNT_IDX]) |
4174 | return -ENOMEM; | |
4175 | ||
4176 | hist_data->n_vals++; | |
30350d65 | 4177 | hist_data->n_fields++; |
7ef224d1 TZ |
4178 | |
4179 | if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX)) | |
4180 | return -EINVAL; | |
4181 | ||
4182 | return 0; | |
4183 | } | |
4184 | ||
30350d65 TZ |
4185 | static int __create_val_field(struct hist_trigger_data *hist_data, |
4186 | unsigned int val_idx, | |
4187 | struct trace_event_file *file, | |
4188 | char *var_name, char *field_str, | |
4189 | unsigned long flags) | |
f2606835 | 4190 | { |
100719dc | 4191 | struct hist_field *hist_field; |
9710b2f3 | 4192 | int ret = 0, n_subexprs = 0; |
f2606835 | 4193 | |
9710b2f3 | 4194 | hist_field = parse_expr(hist_data, file, field_str, flags, var_name, &n_subexprs); |
100719dc TZ |
4195 | if (IS_ERR(hist_field)) { |
4196 | ret = PTR_ERR(hist_field); | |
f2606835 TZ |
4197 | goto out; |
4198 | } | |
4199 | ||
100719dc TZ |
4200 | hist_data->fields[val_idx] = hist_field; |
4201 | ||
f2606835 | 4202 | ++hist_data->n_vals; |
30350d65 | 4203 | ++hist_data->n_fields; |
f2606835 | 4204 | |
30350d65 | 4205 | if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) |
f2606835 TZ |
4206 | ret = -EINVAL; |
4207 | out: | |
4208 | return ret; | |
4209 | } | |
4210 | ||
30350d65 TZ |
4211 | static int create_val_field(struct hist_trigger_data *hist_data, |
4212 | unsigned int val_idx, | |
4213 | struct trace_event_file *file, | |
4214 | char *field_str) | |
4215 | { | |
4216 | if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX)) | |
4217 | return -EINVAL; | |
4218 | ||
4219 | return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0); | |
4220 | } | |
4221 | ||
2d601b98 | 4222 | static const char no_comm[] = "(no comm)"; |
ed2cf907 SRV |
4223 | |
4224 | static u64 hist_field_execname(struct hist_field *hist_field, | |
4225 | struct tracing_map_elt *elt, | |
4226 | struct trace_buffer *buffer, | |
4227 | struct ring_buffer_event *rbe, | |
4228 | void *event) | |
4229 | { | |
4230 | struct hist_elt_data *elt_data; | |
4231 | ||
4232 | if (WARN_ON_ONCE(!elt)) | |
4233 | return (u64)(unsigned long)no_comm; | |
4234 | ||
4235 | elt_data = elt->private_data; | |
4236 | ||
4237 | if (WARN_ON_ONCE(!elt_data->comm)) | |
4238 | return (u64)(unsigned long)no_comm; | |
4239 | ||
4240 | return (u64)(unsigned long)(elt_data->comm); | |
4241 | } | |
4242 | ||
86087383 SRG |
4243 | static u64 hist_fn_call(struct hist_field *hist_field, |
4244 | struct tracing_map_elt *elt, | |
4245 | struct trace_buffer *buffer, | |
4246 | struct ring_buffer_event *rbe, | |
4247 | void *event) | |
4248 | { | |
4249 | switch (hist_field->fn_num) { | |
4250 | case HIST_FIELD_FN_VAR_REF: | |
4251 | return hist_field_var_ref(hist_field, elt, buffer, rbe, event); | |
4252 | case HIST_FIELD_FN_COUNTER: | |
4253 | return hist_field_counter(hist_field, elt, buffer, rbe, event); | |
4254 | case HIST_FIELD_FN_CONST: | |
4255 | return hist_field_const(hist_field, elt, buffer, rbe, event); | |
4256 | case HIST_FIELD_FN_LOG2: | |
4257 | return hist_field_log2(hist_field, elt, buffer, rbe, event); | |
4258 | case HIST_FIELD_FN_BUCKET: | |
4259 | return hist_field_bucket(hist_field, elt, buffer, rbe, event); | |
4260 | case HIST_FIELD_FN_TIMESTAMP: | |
4261 | return hist_field_timestamp(hist_field, elt, buffer, rbe, event); | |
4262 | case HIST_FIELD_FN_CPU: | |
4263 | return hist_field_cpu(hist_field, elt, buffer, rbe, event); | |
4264 | case HIST_FIELD_FN_STRING: | |
4265 | return hist_field_string(hist_field, elt, buffer, rbe, event); | |
4266 | case HIST_FIELD_FN_DYNSTRING: | |
4267 | return hist_field_dynstring(hist_field, elt, buffer, rbe, event); | |
4268 | case HIST_FIELD_FN_RELDYNSTRING: | |
4269 | return hist_field_reldynstring(hist_field, elt, buffer, rbe, event); | |
4270 | case HIST_FIELD_FN_PSTRING: | |
4271 | return hist_field_pstring(hist_field, elt, buffer, rbe, event); | |
4272 | case HIST_FIELD_FN_S64: | |
4273 | return hist_field_s64(hist_field, elt, buffer, rbe, event); | |
4274 | case HIST_FIELD_FN_U64: | |
4275 | return hist_field_u64(hist_field, elt, buffer, rbe, event); | |
4276 | case HIST_FIELD_FN_S32: | |
4277 | return hist_field_s32(hist_field, elt, buffer, rbe, event); | |
4278 | case HIST_FIELD_FN_U32: | |
4279 | return hist_field_u32(hist_field, elt, buffer, rbe, event); | |
4280 | case HIST_FIELD_FN_S16: | |
4281 | return hist_field_s16(hist_field, elt, buffer, rbe, event); | |
4282 | case HIST_FIELD_FN_U16: | |
4283 | return hist_field_u16(hist_field, elt, buffer, rbe, event); | |
4284 | case HIST_FIELD_FN_S8: | |
4285 | return hist_field_s8(hist_field, elt, buffer, rbe, event); | |
4286 | case HIST_FIELD_FN_U8: | |
4287 | return hist_field_u8(hist_field, elt, buffer, rbe, event); | |
4288 | case HIST_FIELD_FN_UMINUS: | |
4289 | return hist_field_unary_minus(hist_field, elt, buffer, rbe, event); | |
4290 | case HIST_FIELD_FN_MINUS: | |
4291 | return hist_field_minus(hist_field, elt, buffer, rbe, event); | |
4292 | case HIST_FIELD_FN_PLUS: | |
4293 | return hist_field_plus(hist_field, elt, buffer, rbe, event); | |
4294 | case HIST_FIELD_FN_DIV: | |
4295 | return hist_field_div(hist_field, elt, buffer, rbe, event); | |
4296 | case HIST_FIELD_FN_MULT: | |
4297 | return hist_field_mult(hist_field, elt, buffer, rbe, event); | |
4298 | case HIST_FIELD_FN_DIV_POWER2: | |
4299 | return div_by_power_of_two(hist_field, elt, buffer, rbe, event); | |
4300 | case HIST_FIELD_FN_DIV_NOT_POWER2: | |
4301 | return div_by_not_power_of_two(hist_field, elt, buffer, rbe, event); | |
4302 | case HIST_FIELD_FN_DIV_MULT_SHIFT: | |
4303 | return div_by_mult_and_shift(hist_field, elt, buffer, rbe, event); | |
4304 | case HIST_FIELD_FN_EXECNAME: | |
4305 | return hist_field_execname(hist_field, elt, buffer, rbe, event); | |
4306 | default: | |
4307 | return 0; | |
4308 | } | |
4309 | } | |
4310 | ||
ed2cf907 SRV |
4311 | /* Convert a var that points to common_pid.execname to a string */ |
4312 | static void update_var_execname(struct hist_field *hist_field) | |
4313 | { | |
4314 | hist_field->flags = HIST_FIELD_FL_STRING | HIST_FIELD_FL_VAR | | |
4315 | HIST_FIELD_FL_EXECNAME; | |
4316 | hist_field->size = MAX_FILTER_STR_VAL; | |
4317 | hist_field->is_signed = 0; | |
4318 | ||
4319 | kfree_const(hist_field->type); | |
4320 | hist_field->type = "char[]"; | |
4321 | ||
86087383 | 4322 | hist_field->fn_num = HIST_FIELD_FN_EXECNAME; |
ed2cf907 SRV |
4323 | } |
4324 | ||
30350d65 TZ |
4325 | static int create_var_field(struct hist_trigger_data *hist_data, |
4326 | unsigned int val_idx, | |
4327 | struct trace_event_file *file, | |
4328 | char *var_name, char *expr_str) | |
4329 | { | |
d0cd871b | 4330 | struct trace_array *tr = hist_data->event_file->tr; |
30350d65 | 4331 | unsigned long flags = 0; |
63a1e5de | 4332 | int ret; |
30350d65 TZ |
4333 | |
4334 | if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) | |
4335 | return -EINVAL; | |
f404da6e | 4336 | |
30350d65 | 4337 | if (find_var(hist_data, file, var_name) && !hist_data->remove) { |
d0cd871b | 4338 | hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name)); |
30350d65 TZ |
4339 | return -EINVAL; |
4340 | } | |
4341 | ||
4342 | flags |= HIST_FIELD_FL_VAR; | |
4343 | hist_data->n_vars++; | |
4344 | if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX)) | |
4345 | return -EINVAL; | |
4346 | ||
63a1e5de TZ |
4347 | ret = __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags); |
4348 | ||
ed2cf907 SRV |
4349 | if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_EXECNAME) |
4350 | update_var_execname(hist_data->fields[val_idx]); | |
4351 | ||
6d9bd139 | 4352 | if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_STRING) |
63a1e5de TZ |
4353 | hist_data->fields[val_idx]->var_str_idx = hist_data->n_var_str++; |
4354 | ||
4355 | return ret; | |
30350d65 TZ |
4356 | } |
4357 | ||
7ef224d1 TZ |
4358 | static int create_val_fields(struct hist_trigger_data *hist_data, |
4359 | struct trace_event_file *file) | |
4360 | { | |
5f2e094e | 4361 | unsigned int i, j = 1, n_hitcount = 0; |
f2606835 | 4362 | char *fields_str, *field_str; |
7ef224d1 TZ |
4363 | int ret; |
4364 | ||
4365 | ret = create_hitcount_val(hist_data); | |
f2606835 TZ |
4366 | if (ret) |
4367 | goto out; | |
7ef224d1 | 4368 | |
f2606835 TZ |
4369 | fields_str = hist_data->attrs->vals_str; |
4370 | if (!fields_str) | |
4371 | goto out; | |
4372 | ||
f2606835 TZ |
4373 | for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX && |
4374 | j < TRACING_MAP_VALS_MAX; i++) { | |
4375 | field_str = strsep(&fields_str, ","); | |
4376 | if (!field_str) | |
4377 | break; | |
30350d65 | 4378 | |
5f2e094e TZ |
4379 | if (strcmp(field_str, "hitcount") == 0) { |
4380 | if (!n_hitcount++) | |
4381 | continue; | |
4382 | } | |
30350d65 | 4383 | |
f2606835 TZ |
4384 | ret = create_val_field(hist_data, j++, file, field_str); |
4385 | if (ret) | |
4386 | goto out; | |
4387 | } | |
30350d65 | 4388 | |
f2606835 TZ |
4389 | if (fields_str && (strcmp(fields_str, "hitcount") != 0)) |
4390 | ret = -EINVAL; | |
4391 | out: | |
ccf47f5c MHG |
4392 | /* There is only raw hitcount but nohitcount suppresses it. */ |
4393 | if (j == 1 && hist_data->attrs->no_hitcount) { | |
4394 | hist_err(hist_data->event_file->tr, HIST_ERR_NEED_NOHC_VAL, 0); | |
4395 | ret = -ENOENT; | |
4396 | } | |
4397 | ||
7ef224d1 TZ |
4398 | return ret; |
4399 | } | |
4400 | ||
4401 | static int create_key_field(struct hist_trigger_data *hist_data, | |
4402 | unsigned int key_idx, | |
76a3b0c8 | 4403 | unsigned int key_offset, |
7ef224d1 TZ |
4404 | struct trace_event_file *file, |
4405 | char *field_str) | |
4406 | { | |
d0cd871b | 4407 | struct trace_array *tr = hist_data->event_file->tr; |
30350d65 | 4408 | struct hist_field *hist_field = NULL; |
7ef224d1 TZ |
4409 | unsigned long flags = 0; |
4410 | unsigned int key_size; | |
9710b2f3 | 4411 | int ret = 0, n_subexprs = 0; |
7ef224d1 | 4412 | |
30350d65 | 4413 | if (WARN_ON(key_idx >= HIST_FIELDS_MAX)) |
7ef224d1 TZ |
4414 | return -EINVAL; |
4415 | ||
4416 | flags |= HIST_FIELD_FL_KEY; | |
4417 | ||
69a0200c TZ |
4418 | if (strcmp(field_str, "stacktrace") == 0) { |
4419 | flags |= HIST_FIELD_FL_STACKTRACE; | |
4420 | key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH; | |
30350d65 | 4421 | hist_field = create_hist_field(hist_data, NULL, flags, NULL); |
69a0200c | 4422 | } else { |
100719dc | 4423 | hist_field = parse_expr(hist_data, file, field_str, flags, |
9710b2f3 | 4424 | NULL, &n_subexprs); |
100719dc TZ |
4425 | if (IS_ERR(hist_field)) { |
4426 | ret = PTR_ERR(hist_field); | |
4427 | goto out; | |
69a0200c TZ |
4428 | } |
4429 | ||
c8d94a18 | 4430 | if (field_has_hist_vars(hist_field, 0)) { |
d0cd871b | 4431 | hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str)); |
067fe038 TZ |
4432 | destroy_hist_field(hist_field, 0); |
4433 | ret = -EINVAL; | |
4434 | goto out; | |
4435 | } | |
4436 | ||
100719dc | 4437 | key_size = hist_field->size; |
7ef224d1 TZ |
4438 | } |
4439 | ||
100719dc | 4440 | hist_data->fields[key_idx] = hist_field; |
7ef224d1 TZ |
4441 | |
4442 | key_size = ALIGN(key_size, sizeof(u64)); | |
4443 | hist_data->fields[key_idx]->size = key_size; | |
76a3b0c8 | 4444 | hist_data->fields[key_idx]->offset = key_offset; |
100719dc | 4445 | |
76a3b0c8 | 4446 | hist_data->key_size += key_size; |
100719dc | 4447 | |
7ef224d1 TZ |
4448 | if (hist_data->key_size > HIST_KEY_SIZE_MAX) { |
4449 | ret = -EINVAL; | |
4450 | goto out; | |
4451 | } | |
4452 | ||
4453 | hist_data->n_keys++; | |
30350d65 | 4454 | hist_data->n_fields++; |
7ef224d1 TZ |
4455 | |
4456 | if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX)) | |
4457 | return -EINVAL; | |
4458 | ||
4459 | ret = key_size; | |
4460 | out: | |
4461 | return ret; | |
4462 | } | |
4463 | ||
4464 | static int create_key_fields(struct hist_trigger_data *hist_data, | |
4465 | struct trace_event_file *file) | |
4466 | { | |
76a3b0c8 | 4467 | unsigned int i, key_offset = 0, n_vals = hist_data->n_vals; |
7ef224d1 TZ |
4468 | char *fields_str, *field_str; |
4469 | int ret = -EINVAL; | |
4470 | ||
4471 | fields_str = hist_data->attrs->keys_str; | |
4472 | if (!fields_str) | |
4473 | goto out; | |
4474 | ||
76a3b0c8 | 4475 | for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) { |
7ef224d1 TZ |
4476 | field_str = strsep(&fields_str, ","); |
4477 | if (!field_str) | |
4478 | break; | |
76a3b0c8 TZ |
4479 | ret = create_key_field(hist_data, i, key_offset, |
4480 | file, field_str); | |
7ef224d1 TZ |
4481 | if (ret < 0) |
4482 | goto out; | |
76a3b0c8 | 4483 | key_offset += ret; |
7ef224d1 TZ |
4484 | } |
4485 | if (fields_str) { | |
4486 | ret = -EINVAL; | |
4487 | goto out; | |
4488 | } | |
4489 | ret = 0; | |
4490 | out: | |
4491 | return ret; | |
4492 | } | |
4493 | ||
30350d65 TZ |
4494 | static int create_var_fields(struct hist_trigger_data *hist_data, |
4495 | struct trace_event_file *file) | |
4496 | { | |
4497 | unsigned int i, j = hist_data->n_vals; | |
4498 | int ret = 0; | |
4499 | ||
4500 | unsigned int n_vars = hist_data->attrs->var_defs.n_vars; | |
4501 | ||
4502 | for (i = 0; i < n_vars; i++) { | |
4503 | char *var_name = hist_data->attrs->var_defs.name[i]; | |
4504 | char *expr = hist_data->attrs->var_defs.expr[i]; | |
4505 | ||
4506 | ret = create_var_field(hist_data, j++, file, var_name, expr); | |
4507 | if (ret) | |
4508 | goto out; | |
4509 | } | |
4510 | out: | |
4511 | return ret; | |
4512 | } | |
4513 | ||
4514 | static void free_var_defs(struct hist_trigger_data *hist_data) | |
4515 | { | |
4516 | unsigned int i; | |
4517 | ||
4518 | for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { | |
4519 | kfree(hist_data->attrs->var_defs.name[i]); | |
4520 | kfree(hist_data->attrs->var_defs.expr[i]); | |
4521 | } | |
4522 | ||
4523 | hist_data->attrs->var_defs.n_vars = 0; | |
4524 | } | |
4525 | ||
4526 | static int parse_var_defs(struct hist_trigger_data *hist_data) | |
4527 | { | |
d0cd871b | 4528 | struct trace_array *tr = hist_data->event_file->tr; |
30350d65 TZ |
4529 | char *s, *str, *var_name, *field_str; |
4530 | unsigned int i, j, n_vars = 0; | |
4531 | int ret = 0; | |
4532 | ||
4533 | for (i = 0; i < hist_data->attrs->n_assignments; i++) { | |
4534 | str = hist_data->attrs->assignment_str[i]; | |
4535 | for (j = 0; j < TRACING_MAP_VARS_MAX; j++) { | |
4536 | field_str = strsep(&str, ","); | |
4537 | if (!field_str) | |
4538 | break; | |
4539 | ||
4540 | var_name = strsep(&field_str, "="); | |
4541 | if (!var_name || !field_str) { | |
d0cd871b SRV |
4542 | hist_err(tr, HIST_ERR_MALFORMED_ASSIGNMENT, |
4543 | errpos(var_name)); | |
30350d65 TZ |
4544 | ret = -EINVAL; |
4545 | goto free; | |
4546 | } | |
4547 | ||
4548 | if (n_vars == TRACING_MAP_VARS_MAX) { | |
d0cd871b | 4549 | hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name)); |
30350d65 TZ |
4550 | ret = -EINVAL; |
4551 | goto free; | |
4552 | } | |
4553 | ||
4554 | s = kstrdup(var_name, GFP_KERNEL); | |
4555 | if (!s) { | |
4556 | ret = -ENOMEM; | |
4557 | goto free; | |
4558 | } | |
4559 | hist_data->attrs->var_defs.name[n_vars] = s; | |
4560 | ||
4561 | s = kstrdup(field_str, GFP_KERNEL); | |
4562 | if (!s) { | |
7edc3945 ZY |
4563 | kfree(hist_data->attrs->var_defs.name[n_vars]); |
4564 | hist_data->attrs->var_defs.name[n_vars] = NULL; | |
30350d65 TZ |
4565 | ret = -ENOMEM; |
4566 | goto free; | |
4567 | } | |
4568 | hist_data->attrs->var_defs.expr[n_vars++] = s; | |
4569 | ||
4570 | hist_data->attrs->var_defs.n_vars = n_vars; | |
4571 | } | |
4572 | } | |
4573 | ||
4574 | return ret; | |
4575 | free: | |
4576 | free_var_defs(hist_data); | |
4577 | ||
4578 | return ret; | |
4579 | } | |
4580 | ||
7ef224d1 TZ |
4581 | static int create_hist_fields(struct hist_trigger_data *hist_data, |
4582 | struct trace_event_file *file) | |
4583 | { | |
4584 | int ret; | |
4585 | ||
30350d65 TZ |
4586 | ret = parse_var_defs(hist_data); |
4587 | if (ret) | |
fb991f19 | 4588 | return ret; |
30350d65 | 4589 | |
7ef224d1 TZ |
4590 | ret = create_val_fields(hist_data, file); |
4591 | if (ret) | |
4592 | goto out; | |
4593 | ||
30350d65 | 4594 | ret = create_var_fields(hist_data, file); |
7ef224d1 TZ |
4595 | if (ret) |
4596 | goto out; | |
4597 | ||
30350d65 | 4598 | ret = create_key_fields(hist_data, file); |
fb991f19 | 4599 | |
7ef224d1 | 4600 | out: |
30350d65 TZ |
4601 | free_var_defs(hist_data); |
4602 | ||
7ef224d1 TZ |
4603 | return ret; |
4604 | } | |
4605 | ||
4de26c8c | 4606 | static int is_descending(struct trace_array *tr, const char *str) |
e62347d2 TZ |
4607 | { |
4608 | if (!str) | |
4609 | return 0; | |
4610 | ||
4611 | if (strcmp(str, "descending") == 0) | |
4612 | return 1; | |
4613 | ||
4614 | if (strcmp(str, "ascending") == 0) | |
4615 | return 0; | |
4616 | ||
4de26c8c TZ |
4617 | hist_err(tr, HIST_ERR_INVALID_SORT_MODIFIER, errpos((char *)str)); |
4618 | ||
e62347d2 TZ |
4619 | return -EINVAL; |
4620 | } | |
4621 | ||
7ef224d1 TZ |
4622 | static int create_sort_keys(struct hist_trigger_data *hist_data) |
4623 | { | |
4de26c8c | 4624 | struct trace_array *tr = hist_data->event_file->tr; |
e62347d2 | 4625 | char *fields_str = hist_data->attrs->sort_key_str; |
e62347d2 TZ |
4626 | struct tracing_map_sort_key *sort_key; |
4627 | int descending, ret = 0; | |
30350d65 | 4628 | unsigned int i, j, k; |
e62347d2 TZ |
4629 | |
4630 | hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */ | |
4631 | ||
4632 | if (!fields_str) | |
4633 | goto out; | |
4634 | ||
e62347d2 | 4635 | for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) { |
85013256 | 4636 | struct hist_field *hist_field; |
e62347d2 | 4637 | char *field_str, *field_name; |
85013256 | 4638 | const char *test_name; |
e62347d2 TZ |
4639 | |
4640 | sort_key = &hist_data->sort_keys[i]; | |
4641 | ||
4642 | field_str = strsep(&fields_str, ","); | |
b527b638 TZ |
4643 | if (!field_str) |
4644 | break; | |
4645 | ||
4646 | if (!*field_str) { | |
4647 | ret = -EINVAL; | |
4de26c8c | 4648 | hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort=")); |
e62347d2 TZ |
4649 | break; |
4650 | } | |
4651 | ||
4652 | if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) { | |
4de26c8c | 4653 | hist_err(tr, HIST_ERR_TOO_MANY_SORT_FIELDS, errpos("sort=")); |
e62347d2 TZ |
4654 | ret = -EINVAL; |
4655 | break; | |
4656 | } | |
7ef224d1 | 4657 | |
e62347d2 | 4658 | field_name = strsep(&field_str, "."); |
b527b638 | 4659 | if (!field_name || !*field_name) { |
e62347d2 | 4660 | ret = -EINVAL; |
4de26c8c | 4661 | hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort=")); |
e62347d2 TZ |
4662 | break; |
4663 | } | |
4664 | ||
4665 | if (strcmp(field_name, "hitcount") == 0) { | |
4de26c8c | 4666 | descending = is_descending(tr, field_str); |
e62347d2 TZ |
4667 | if (descending < 0) { |
4668 | ret = descending; | |
4669 | break; | |
4670 | } | |
4671 | sort_key->descending = descending; | |
4672 | continue; | |
4673 | } | |
7ef224d1 | 4674 | |
30350d65 TZ |
4675 | for (j = 1, k = 1; j < hist_data->n_fields; j++) { |
4676 | unsigned int idx; | |
4677 | ||
85013256 | 4678 | hist_field = hist_data->fields[j]; |
30350d65 TZ |
4679 | if (hist_field->flags & HIST_FIELD_FL_VAR) |
4680 | continue; | |
4681 | ||
4682 | idx = k++; | |
4683 | ||
85013256 TZ |
4684 | test_name = hist_field_name(hist_field, 0); |
4685 | ||
4686 | if (strcmp(field_name, test_name) == 0) { | |
30350d65 | 4687 | sort_key->field_idx = idx; |
4de26c8c | 4688 | descending = is_descending(tr, field_str); |
e62347d2 TZ |
4689 | if (descending < 0) { |
4690 | ret = descending; | |
4691 | goto out; | |
4692 | } | |
4693 | sort_key->descending = descending; | |
4694 | break; | |
4695 | } | |
4696 | } | |
4697 | if (j == hist_data->n_fields) { | |
4698 | ret = -EINVAL; | |
4de26c8c | 4699 | hist_err(tr, HIST_ERR_INVALID_SORT_FIELD, errpos(field_name)); |
e62347d2 TZ |
4700 | break; |
4701 | } | |
4702 | } | |
30350d65 | 4703 | |
e62347d2 TZ |
4704 | hist_data->n_sort_keys = i; |
4705 | out: | |
7ef224d1 TZ |
4706 | return ret; |
4707 | } | |
4708 | ||
0212e2aa TZ |
4709 | static void destroy_actions(struct hist_trigger_data *hist_data) |
4710 | { | |
4711 | unsigned int i; | |
4712 | ||
4713 | for (i = 0; i < hist_data->n_actions; i++) { | |
4714 | struct action_data *data = hist_data->actions[i]; | |
4715 | ||
7d18a10c | 4716 | if (data->handler == HANDLER_ONMATCH) |
c282a386 | 4717 | onmatch_destroy(data); |
dff81f55 TZ |
4718 | else if (data->handler == HANDLER_ONMAX || |
4719 | data->handler == HANDLER_ONCHANGE) | |
466f4528 | 4720 | track_data_destroy(hist_data, data); |
c282a386 TZ |
4721 | else |
4722 | kfree(data); | |
0212e2aa TZ |
4723 | } |
4724 | } | |
4725 | ||
4726 | static int parse_actions(struct hist_trigger_data *hist_data) | |
4727 | { | |
c282a386 TZ |
4728 | struct trace_array *tr = hist_data->event_file->tr; |
4729 | struct action_data *data; | |
0212e2aa TZ |
4730 | unsigned int i; |
4731 | int ret = 0; | |
4732 | char *str; | |
036876fa | 4733 | int len; |
0212e2aa TZ |
4734 | |
4735 | for (i = 0; i < hist_data->attrs->n_actions; i++) { | |
4736 | str = hist_data->attrs->action_str[i]; | |
c282a386 | 4737 | |
036876fa SRV |
4738 | if ((len = str_has_prefix(str, "onmatch("))) { |
4739 | char *action_str = str + len; | |
c282a386 TZ |
4740 | |
4741 | data = onmatch_parse(tr, action_str); | |
4742 | if (IS_ERR(data)) { | |
4743 | ret = PTR_ERR(data); | |
4744 | break; | |
4745 | } | |
036876fa SRV |
4746 | } else if ((len = str_has_prefix(str, "onmax("))) { |
4747 | char *action_str = str + len; | |
50450603 | 4748 | |
466f4528 TZ |
4749 | data = track_data_parse(hist_data, action_str, |
4750 | HANDLER_ONMAX); | |
50450603 TZ |
4751 | if (IS_ERR(data)) { |
4752 | ret = PTR_ERR(data); | |
4753 | break; | |
4754 | } | |
dff81f55 TZ |
4755 | } else if ((len = str_has_prefix(str, "onchange("))) { |
4756 | char *action_str = str + len; | |
4757 | ||
4758 | data = track_data_parse(hist_data, action_str, | |
4759 | HANDLER_ONCHANGE); | |
4760 | if (IS_ERR(data)) { | |
4761 | ret = PTR_ERR(data); | |
4762 | break; | |
4763 | } | |
c282a386 TZ |
4764 | } else { |
4765 | ret = -EINVAL; | |
4766 | break; | |
4767 | } | |
4768 | ||
4769 | hist_data->actions[hist_data->n_actions++] = data; | |
0212e2aa TZ |
4770 | } |
4771 | ||
4772 | return ret; | |
4773 | } | |
4774 | ||
7d18a10c | 4775 | static int create_actions(struct hist_trigger_data *hist_data) |
0212e2aa TZ |
4776 | { |
4777 | struct action_data *data; | |
4778 | unsigned int i; | |
4779 | int ret = 0; | |
4780 | ||
4781 | for (i = 0; i < hist_data->attrs->n_actions; i++) { | |
4782 | data = hist_data->actions[i]; | |
c282a386 | 4783 | |
7d18a10c TZ |
4784 | if (data->handler == HANDLER_ONMATCH) { |
4785 | ret = onmatch_create(hist_data, data); | |
c282a386 | 4786 | if (ret) |
7d18a10c | 4787 | break; |
dff81f55 TZ |
4788 | } else if (data->handler == HANDLER_ONMAX || |
4789 | data->handler == HANDLER_ONCHANGE) { | |
466f4528 | 4790 | ret = track_data_create(hist_data, data); |
50450603 | 4791 | if (ret) |
7d18a10c TZ |
4792 | break; |
4793 | } else { | |
4794 | ret = -EINVAL; | |
4795 | break; | |
c282a386 | 4796 | } |
0212e2aa TZ |
4797 | } |
4798 | ||
4799 | return ret; | |
4800 | } | |
4801 | ||
50450603 TZ |
4802 | static void print_actions(struct seq_file *m, |
4803 | struct hist_trigger_data *hist_data, | |
4804 | struct tracing_map_elt *elt) | |
4805 | { | |
4806 | unsigned int i; | |
4807 | ||
4808 | for (i = 0; i < hist_data->n_actions; i++) { | |
4809 | struct action_data *data = hist_data->actions[i]; | |
4810 | ||
a3785b7e TZ |
4811 | if (data->action == ACTION_SNAPSHOT) |
4812 | continue; | |
4813 | ||
dff81f55 TZ |
4814 | if (data->handler == HANDLER_ONMAX || |
4815 | data->handler == HANDLER_ONCHANGE) | |
466f4528 | 4816 | track_data_print(m, hist_data, elt, data); |
50450603 TZ |
4817 | } |
4818 | } | |
4819 | ||
7d18a10c TZ |
4820 | static void print_action_spec(struct seq_file *m, |
4821 | struct hist_trigger_data *hist_data, | |
4822 | struct action_data *data) | |
4823 | { | |
4824 | unsigned int i; | |
4825 | ||
4826 | if (data->action == ACTION_SAVE) { | |
4827 | for (i = 0; i < hist_data->n_save_vars; i++) { | |
4828 | seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name); | |
4829 | if (i < hist_data->n_save_vars - 1) | |
4830 | seq_puts(m, ","); | |
4831 | } | |
4832 | } else if (data->action == ACTION_TRACE) { | |
e91eefd7 TZ |
4833 | if (data->use_trace_keyword) |
4834 | seq_printf(m, "%s", data->synth_event_name); | |
7d18a10c | 4835 | for (i = 0; i < data->n_params; i++) { |
e91eefd7 | 4836 | if (i || data->use_trace_keyword) |
7d18a10c TZ |
4837 | seq_puts(m, ","); |
4838 | seq_printf(m, "%s", data->params[i]); | |
4839 | } | |
4840 | } | |
4841 | } | |
4842 | ||
466f4528 TZ |
4843 | static void print_track_data_spec(struct seq_file *m, |
4844 | struct hist_trigger_data *hist_data, | |
4845 | struct action_data *data) | |
50450603 | 4846 | { |
466f4528 TZ |
4847 | if (data->handler == HANDLER_ONMAX) |
4848 | seq_puts(m, ":onmax("); | |
dff81f55 TZ |
4849 | else if (data->handler == HANDLER_ONCHANGE) |
4850 | seq_puts(m, ":onchange("); | |
466f4528 | 4851 | seq_printf(m, "%s", data->track_data.var_str); |
7d18a10c TZ |
4852 | seq_printf(m, ").%s(", data->action_name); |
4853 | ||
4854 | print_action_spec(m, hist_data, data); | |
50450603 | 4855 | |
50450603 TZ |
4856 | seq_puts(m, ")"); |
4857 | } | |
4858 | ||
c282a386 TZ |
4859 | static void print_onmatch_spec(struct seq_file *m, |
4860 | struct hist_trigger_data *hist_data, | |
4861 | struct action_data *data) | |
4862 | { | |
c3e49506 TZ |
4863 | seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system, |
4864 | data->match_data.event); | |
c282a386 | 4865 | |
7d18a10c | 4866 | seq_printf(m, "%s(", data->action_name); |
c282a386 | 4867 | |
7d18a10c | 4868 | print_action_spec(m, hist_data, data); |
c282a386 TZ |
4869 | |
4870 | seq_puts(m, ")"); | |
4871 | } | |
4872 | ||
48f79473 TZ |
4873 | static bool actions_match(struct hist_trigger_data *hist_data, |
4874 | struct hist_trigger_data *hist_data_test) | |
4875 | { | |
4876 | unsigned int i, j; | |
4877 | ||
4878 | if (hist_data->n_actions != hist_data_test->n_actions) | |
4879 | return false; | |
4880 | ||
4881 | for (i = 0; i < hist_data->n_actions; i++) { | |
4882 | struct action_data *data = hist_data->actions[i]; | |
4883 | struct action_data *data_test = hist_data_test->actions[i]; | |
e91eefd7 | 4884 | char *action_name, *action_name_test; |
48f79473 | 4885 | |
7d18a10c TZ |
4886 | if (data->handler != data_test->handler) |
4887 | return false; | |
4888 | if (data->action != data_test->action) | |
48f79473 TZ |
4889 | return false; |
4890 | ||
4891 | if (data->n_params != data_test->n_params) | |
4892 | return false; | |
4893 | ||
4894 | for (j = 0; j < data->n_params; j++) { | |
4895 | if (strcmp(data->params[j], data_test->params[j]) != 0) | |
4896 | return false; | |
4897 | } | |
4898 | ||
e91eefd7 TZ |
4899 | if (data->use_trace_keyword) |
4900 | action_name = data->synth_event_name; | |
4901 | else | |
4902 | action_name = data->action_name; | |
4903 | ||
4904 | if (data_test->use_trace_keyword) | |
4905 | action_name_test = data_test->synth_event_name; | |
4906 | else | |
4907 | action_name_test = data_test->action_name; | |
4908 | ||
4909 | if (strcmp(action_name, action_name_test) != 0) | |
7d18a10c TZ |
4910 | return false; |
4911 | ||
4912 | if (data->handler == HANDLER_ONMATCH) { | |
c3e49506 TZ |
4913 | if (strcmp(data->match_data.event_system, |
4914 | data_test->match_data.event_system) != 0) | |
48f79473 | 4915 | return false; |
c3e49506 TZ |
4916 | if (strcmp(data->match_data.event, |
4917 | data_test->match_data.event) != 0) | |
48f79473 | 4918 | return false; |
dff81f55 TZ |
4919 | } else if (data->handler == HANDLER_ONMAX || |
4920 | data->handler == HANDLER_ONCHANGE) { | |
466f4528 TZ |
4921 | if (strcmp(data->track_data.var_str, |
4922 | data_test->track_data.var_str) != 0) | |
48f79473 | 4923 | return false; |
48f79473 TZ |
4924 | } |
4925 | } | |
4926 | ||
4927 | return true; | |
4928 | } | |
4929 | ||
4930 | ||
c282a386 TZ |
4931 | static void print_actions_spec(struct seq_file *m, |
4932 | struct hist_trigger_data *hist_data) | |
4933 | { | |
4934 | unsigned int i; | |
4935 | ||
4936 | for (i = 0; i < hist_data->n_actions; i++) { | |
4937 | struct action_data *data = hist_data->actions[i]; | |
4938 | ||
7d18a10c | 4939 | if (data->handler == HANDLER_ONMATCH) |
c282a386 | 4940 | print_onmatch_spec(m, hist_data, data); |
dff81f55 TZ |
4941 | else if (data->handler == HANDLER_ONMAX || |
4942 | data->handler == HANDLER_ONCHANGE) | |
466f4528 | 4943 | print_track_data_spec(m, hist_data, data); |
c282a386 TZ |
4944 | } |
4945 | } | |
4946 | ||
02205a67 TZ |
4947 | static void destroy_field_var_hists(struct hist_trigger_data *hist_data) |
4948 | { | |
4949 | unsigned int i; | |
4950 | ||
4951 | for (i = 0; i < hist_data->n_field_var_hists; i++) { | |
4952 | kfree(hist_data->field_var_hists[i]->cmd); | |
4953 | kfree(hist_data->field_var_hists[i]); | |
4954 | } | |
4955 | } | |
4956 | ||
7ef224d1 TZ |
4957 | static void destroy_hist_data(struct hist_trigger_data *hist_data) |
4958 | { | |
0212e2aa TZ |
4959 | if (!hist_data) |
4960 | return; | |
4961 | ||
7ef224d1 TZ |
4962 | destroy_hist_trigger_attrs(hist_data->attrs); |
4963 | destroy_hist_fields(hist_data); | |
4964 | tracing_map_destroy(hist_data->map); | |
0212e2aa TZ |
4965 | |
4966 | destroy_actions(hist_data); | |
02205a67 TZ |
4967 | destroy_field_vars(hist_data); |
4968 | destroy_field_var_hists(hist_data); | |
0212e2aa | 4969 | |
7ef224d1 TZ |
4970 | kfree(hist_data); |
4971 | } | |
4972 | ||
4973 | static int create_tracing_map_fields(struct hist_trigger_data *hist_data) | |
4974 | { | |
4975 | struct tracing_map *map = hist_data->map; | |
4976 | struct ftrace_event_field *field; | |
4977 | struct hist_field *hist_field; | |
b28d7b2d | 4978 | int i, idx = 0; |
7ef224d1 TZ |
4979 | |
4980 | for_each_hist_field(i, hist_data) { | |
4981 | hist_field = hist_data->fields[i]; | |
4982 | if (hist_field->flags & HIST_FIELD_FL_KEY) { | |
4983 | tracing_map_cmp_fn_t cmp_fn; | |
4984 | ||
4985 | field = hist_field->field; | |
4986 | ||
69a0200c TZ |
4987 | if (hist_field->flags & HIST_FIELD_FL_STACKTRACE) |
4988 | cmp_fn = tracing_map_cmp_none; | |
1d1898f6 | 4989 | else if (!field || hist_field->flags & HIST_FIELD_FL_CPU) |
ad42febe TZ |
4990 | cmp_fn = tracing_map_cmp_num(hist_field->size, |
4991 | hist_field->is_signed); | |
69a0200c | 4992 | else if (is_string_field(field)) |
7ef224d1 TZ |
4993 | cmp_fn = tracing_map_cmp_string; |
4994 | else | |
4995 | cmp_fn = tracing_map_cmp_num(field->size, | |
4996 | field->is_signed); | |
76a3b0c8 TZ |
4997 | idx = tracing_map_add_key_field(map, |
4998 | hist_field->offset, | |
4999 | cmp_fn); | |
30350d65 | 5000 | } else if (!(hist_field->flags & HIST_FIELD_FL_VAR)) |
7ef224d1 TZ |
5001 | idx = tracing_map_add_sum_field(map); |
5002 | ||
5003 | if (idx < 0) | |
5004 | return idx; | |
30350d65 TZ |
5005 | |
5006 | if (hist_field->flags & HIST_FIELD_FL_VAR) { | |
5007 | idx = tracing_map_add_var(map); | |
5008 | if (idx < 0) | |
5009 | return idx; | |
5010 | hist_field->var.idx = idx; | |
5011 | hist_field->var.hist_data = hist_data; | |
5012 | } | |
7ef224d1 TZ |
5013 | } |
5014 | ||
5015 | return 0; | |
5016 | } | |
5017 | ||
5018 | static struct hist_trigger_data * | |
5019 | create_hist_data(unsigned int map_bits, | |
5020 | struct hist_trigger_attrs *attrs, | |
30350d65 TZ |
5021 | struct trace_event_file *file, |
5022 | bool remove) | |
7ef224d1 | 5023 | { |
6b4827ad | 5024 | const struct tracing_map_ops *map_ops = NULL; |
7ef224d1 TZ |
5025 | struct hist_trigger_data *hist_data; |
5026 | int ret = 0; | |
5027 | ||
5028 | hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL); | |
5029 | if (!hist_data) | |
5030 | return ERR_PTR(-ENOMEM); | |
5031 | ||
5032 | hist_data->attrs = attrs; | |
30350d65 | 5033 | hist_data->remove = remove; |
067fe038 | 5034 | hist_data->event_file = file; |
7ef224d1 | 5035 | |
0212e2aa TZ |
5036 | ret = parse_actions(hist_data); |
5037 | if (ret) | |
5038 | goto free; | |
5039 | ||
7ef224d1 TZ |
5040 | ret = create_hist_fields(hist_data, file); |
5041 | if (ret) | |
5042 | goto free; | |
5043 | ||
5044 | ret = create_sort_keys(hist_data); | |
5045 | if (ret) | |
5046 | goto free; | |
5047 | ||
af6a29bc | 5048 | map_ops = &hist_trigger_elt_data_ops; |
6b4827ad | 5049 | |
7ef224d1 | 5050 | hist_data->map = tracing_map_create(map_bits, hist_data->key_size, |
6b4827ad | 5051 | map_ops, hist_data); |
7ef224d1 TZ |
5052 | if (IS_ERR(hist_data->map)) { |
5053 | ret = PTR_ERR(hist_data->map); | |
5054 | hist_data->map = NULL; | |
5055 | goto free; | |
5056 | } | |
5057 | ||
5058 | ret = create_tracing_map_fields(hist_data); | |
5059 | if (ret) | |
5060 | goto free; | |
7ef224d1 TZ |
5061 | out: |
5062 | return hist_data; | |
5063 | free: | |
5064 | hist_data->attrs = NULL; | |
5065 | ||
5066 | destroy_hist_data(hist_data); | |
5067 | ||
5068 | hist_data = ERR_PTR(ret); | |
5069 | ||
5070 | goto out; | |
5071 | } | |
5072 | ||
5073 | static void hist_trigger_elt_update(struct hist_trigger_data *hist_data, | |
b47e3302 SRV |
5074 | struct tracing_map_elt *elt, |
5075 | struct trace_buffer *buffer, void *rec, | |
067fe038 TZ |
5076 | struct ring_buffer_event *rbe, |
5077 | u64 *var_ref_vals) | |
7ef224d1 | 5078 | { |
067fe038 | 5079 | struct hist_elt_data *elt_data; |
7ef224d1 | 5080 | struct hist_field *hist_field; |
30350d65 | 5081 | unsigned int i, var_idx; |
7ef224d1 TZ |
5082 | u64 hist_val; |
5083 | ||
067fe038 TZ |
5084 | elt_data = elt->private_data; |
5085 | elt_data->var_ref_vals = var_ref_vals; | |
5086 | ||
7ef224d1 TZ |
5087 | for_each_hist_val_field(i, hist_data) { |
5088 | hist_field = hist_data->fields[i]; | |
86087383 | 5089 | hist_val = hist_fn_call(hist_field, elt, buffer, rbe, rec); |
30350d65 TZ |
5090 | if (hist_field->flags & HIST_FIELD_FL_VAR) { |
5091 | var_idx = hist_field->var.idx; | |
63a1e5de TZ |
5092 | |
5093 | if (hist_field->flags & HIST_FIELD_FL_STRING) { | |
5094 | unsigned int str_start, var_str_idx, idx; | |
5095 | char *str, *val_str; | |
938aa33f | 5096 | unsigned int size; |
63a1e5de TZ |
5097 | |
5098 | str_start = hist_data->n_field_var_str + | |
5099 | hist_data->n_save_var_str; | |
5100 | var_str_idx = hist_field->var_str_idx; | |
5101 | idx = str_start + var_str_idx; | |
5102 | ||
5103 | str = elt_data->field_var_str[idx]; | |
5104 | val_str = (char *)(uintptr_t)hist_val; | |
938aa33f SRV |
5105 | |
5106 | size = min(hist_field->size, STR_VAR_LEN_MAX); | |
5107 | strscpy(str, val_str, size); | |
63a1e5de TZ |
5108 | |
5109 | hist_val = (u64)(uintptr_t)str; | |
5110 | } | |
30350d65 TZ |
5111 | tracing_map_set_var(elt, var_idx, hist_val); |
5112 | continue; | |
5113 | } | |
7ef224d1 TZ |
5114 | tracing_map_update_sum(elt, i, hist_val); |
5115 | } | |
30350d65 TZ |
5116 | |
5117 | for_each_hist_key_field(i, hist_data) { | |
5118 | hist_field = hist_data->fields[i]; | |
5119 | if (hist_field->flags & HIST_FIELD_FL_VAR) { | |
86087383 | 5120 | hist_val = hist_fn_call(hist_field, elt, buffer, rbe, rec); |
30350d65 TZ |
5121 | var_idx = hist_field->var.idx; |
5122 | tracing_map_set_var(elt, var_idx, hist_val); | |
5123 | } | |
5124 | } | |
02205a67 | 5125 | |
b47e3302 | 5126 | update_field_vars(hist_data, elt, buffer, rbe, rec); |
7ef224d1 TZ |
5127 | } |
5128 | ||
6a475cb1 TZ |
5129 | static inline void add_to_key(char *compound_key, void *key, |
5130 | struct hist_field *key_field, void *rec) | |
5131 | { | |
5132 | size_t size = key_field->size; | |
5133 | ||
5134 | if (key_field->flags & HIST_FIELD_FL_STRING) { | |
5135 | struct ftrace_event_field *field; | |
5136 | ||
5137 | field = key_field->field; | |
05770dd0 MH |
5138 | if (field->filter_type == FILTER_DYN_STRING || |
5139 | field->filter_type == FILTER_RDYN_STRING) | |
6a475cb1 | 5140 | size = *(u32 *)(rec + field->offset) >> 16; |
6a475cb1 TZ |
5141 | else if (field->filter_type == FILTER_STATIC_STRING) |
5142 | size = field->size; | |
5143 | ||
5144 | /* ensure NULL-termination */ | |
5145 | if (size > key_field->size - 1) | |
5146 | size = key_field->size - 1; | |
6a475cb1 | 5147 | |
9f0bbf31 TZ |
5148 | strncpy(compound_key + key_field->offset, (char *)key, size); |
5149 | } else | |
5150 | memcpy(compound_key + key_field->offset, key, size); | |
6a475cb1 TZ |
5151 | } |
5152 | ||
0212e2aa TZ |
5153 | static void |
5154 | hist_trigger_actions(struct hist_trigger_data *hist_data, | |
b47e3302 SRV |
5155 | struct tracing_map_elt *elt, |
5156 | struct trace_buffer *buffer, void *rec, | |
7d18a10c TZ |
5157 | struct ring_buffer_event *rbe, void *key, |
5158 | u64 *var_ref_vals) | |
0212e2aa TZ |
5159 | { |
5160 | struct action_data *data; | |
5161 | unsigned int i; | |
5162 | ||
5163 | for (i = 0; i < hist_data->n_actions; i++) { | |
5164 | data = hist_data->actions[i]; | |
b47e3302 | 5165 | data->fn(hist_data, elt, buffer, rec, rbe, key, data, var_ref_vals); |
0212e2aa TZ |
5166 | } |
5167 | } | |
5168 | ||
b47e3302 SRV |
5169 | static void event_hist_trigger(struct event_trigger_data *data, |
5170 | struct trace_buffer *buffer, void *rec, | |
fbd302cb | 5171 | struct ring_buffer_event *rbe) |
7ef224d1 TZ |
5172 | { |
5173 | struct hist_trigger_data *hist_data = data->private_data; | |
6a475cb1 | 5174 | bool use_compound_key = (hist_data->n_keys > 1); |
69a0200c | 5175 | unsigned long entries[HIST_STACKTRACE_DEPTH]; |
067fe038 | 5176 | u64 var_ref_vals[TRACING_MAP_VARS_MAX]; |
76a3b0c8 | 5177 | char compound_key[HIST_KEY_SIZE_MAX]; |
df35d93b | 5178 | struct tracing_map_elt *elt = NULL; |
7ef224d1 | 5179 | struct hist_field *key_field; |
7ef224d1 TZ |
5180 | u64 field_contents; |
5181 | void *key = NULL; | |
5182 | unsigned int i; | |
5183 | ||
ef38c79a SRG |
5184 | if (unlikely(!rbe)) |
5185 | return; | |
5186 | ||
6a475cb1 | 5187 | memset(compound_key, 0, hist_data->key_size); |
76a3b0c8 | 5188 | |
7ef224d1 TZ |
5189 | for_each_hist_key_field(i, hist_data) { |
5190 | key_field = hist_data->fields[i]; | |
5191 | ||
69a0200c | 5192 | if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { |
e7d91663 TG |
5193 | memset(entries, 0, HIST_STACKTRACE_SIZE); |
5194 | stack_trace_save(entries, HIST_STACKTRACE_DEPTH, | |
5195 | HIST_STACKTRACE_SKIP); | |
69a0200c TZ |
5196 | key = entries; |
5197 | } else { | |
86087383 | 5198 | field_contents = hist_fn_call(key_field, elt, buffer, rbe, rec); |
6a475cb1 | 5199 | if (key_field->flags & HIST_FIELD_FL_STRING) { |
69a0200c | 5200 | key = (void *)(unsigned long)field_contents; |
6a475cb1 TZ |
5201 | use_compound_key = true; |
5202 | } else | |
69a0200c | 5203 | key = (void *)&field_contents; |
76a3b0c8 | 5204 | } |
6a475cb1 TZ |
5205 | |
5206 | if (use_compound_key) | |
5207 | add_to_key(compound_key, key, key_field, rec); | |
7ef224d1 TZ |
5208 | } |
5209 | ||
6a475cb1 | 5210 | if (use_compound_key) |
76a3b0c8 TZ |
5211 | key = compound_key; |
5212 | ||
067fe038 TZ |
5213 | if (hist_data->n_var_refs && |
5214 | !resolve_var_refs(hist_data, key, var_ref_vals, false)) | |
5215 | return; | |
5216 | ||
7ef224d1 | 5217 | elt = tracing_map_insert(hist_data->map, key); |
067fe038 TZ |
5218 | if (!elt) |
5219 | return; | |
5220 | ||
b47e3302 | 5221 | hist_trigger_elt_update(hist_data, elt, buffer, rec, rbe, var_ref_vals); |
0212e2aa TZ |
5222 | |
5223 | if (resolve_var_refs(hist_data, key, var_ref_vals, true)) | |
b47e3302 | 5224 | hist_trigger_actions(hist_data, elt, buffer, rec, rbe, key, var_ref_vals); |
7ef224d1 TZ |
5225 | } |
5226 | ||
69a0200c TZ |
5227 | static void hist_trigger_stacktrace_print(struct seq_file *m, |
5228 | unsigned long *stacktrace_entries, | |
5229 | unsigned int max_entries) | |
5230 | { | |
69a0200c TZ |
5231 | unsigned int spaces = 8; |
5232 | unsigned int i; | |
5233 | ||
5234 | for (i = 0; i < max_entries; i++) { | |
4285f2fc | 5235 | if (!stacktrace_entries[i]) |
69a0200c TZ |
5236 | return; |
5237 | ||
5238 | seq_printf(m, "%*c", 1 + spaces, ' '); | |
8720aeec | 5239 | seq_printf(m, "%pS\n", (void*)stacktrace_entries[i]); |
69a0200c TZ |
5240 | } |
5241 | } | |
5242 | ||
a3785b7e TZ |
5243 | static void hist_trigger_print_key(struct seq_file *m, |
5244 | struct hist_trigger_data *hist_data, | |
5245 | void *key, | |
5246 | struct tracing_map_elt *elt) | |
7ef224d1 TZ |
5247 | { |
5248 | struct hist_field *key_field; | |
69a0200c | 5249 | bool multiline = false; |
85013256 | 5250 | const char *field_name; |
7ef224d1 TZ |
5251 | unsigned int i; |
5252 | u64 uval; | |
5253 | ||
5254 | seq_puts(m, "{ "); | |
5255 | ||
5256 | for_each_hist_key_field(i, hist_data) { | |
5257 | key_field = hist_data->fields[i]; | |
5258 | ||
5259 | if (i > hist_data->n_vals) | |
5260 | seq_puts(m, ", "); | |
5261 | ||
85013256 TZ |
5262 | field_name = hist_field_name(key_field, 0); |
5263 | ||
0c4a6b46 TZ |
5264 | if (key_field->flags & HIST_FIELD_FL_HEX) { |
5265 | uval = *(u64 *)(key + key_field->offset); | |
85013256 | 5266 | seq_printf(m, "%s: %llx", field_name, uval); |
c6afad49 TZ |
5267 | } else if (key_field->flags & HIST_FIELD_FL_SYM) { |
5268 | uval = *(u64 *)(key + key_field->offset); | |
8720aeec AB |
5269 | seq_printf(m, "%s: [%llx] %-45ps", field_name, |
5270 | uval, (void *)(uintptr_t)uval); | |
c6afad49 TZ |
5271 | } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) { |
5272 | uval = *(u64 *)(key + key_field->offset); | |
8720aeec AB |
5273 | seq_printf(m, "%s: [%llx] %-55pS", field_name, |
5274 | uval, (void *)(uintptr_t)uval); | |
6b4827ad | 5275 | } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) { |
af6a29bc TZ |
5276 | struct hist_elt_data *elt_data = elt->private_data; |
5277 | char *comm; | |
5278 | ||
5279 | if (WARN_ON_ONCE(!elt_data)) | |
5280 | return; | |
5281 | ||
5282 | comm = elt_data->comm; | |
6b4827ad TZ |
5283 | |
5284 | uval = *(u64 *)(key + key_field->offset); | |
85013256 TZ |
5285 | seq_printf(m, "%s: %-16s[%10llu]", field_name, |
5286 | comm, uval); | |
31696198 TZ |
5287 | } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) { |
5288 | const char *syscall_name; | |
5289 | ||
5290 | uval = *(u64 *)(key + key_field->offset); | |
5291 | syscall_name = get_syscall_name(uval); | |
5292 | if (!syscall_name) | |
5293 | syscall_name = "unknown_syscall"; | |
5294 | ||
85013256 TZ |
5295 | seq_printf(m, "%s: %-30s[%3llu]", field_name, |
5296 | syscall_name, uval); | |
69a0200c TZ |
5297 | } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { |
5298 | seq_puts(m, "stacktrace:\n"); | |
5299 | hist_trigger_stacktrace_print(m, | |
5300 | key + key_field->offset, | |
5301 | HIST_STACKTRACE_DEPTH); | |
5302 | multiline = true; | |
4b94f5b7 | 5303 | } else if (key_field->flags & HIST_FIELD_FL_LOG2) { |
85013256 | 5304 | seq_printf(m, "%s: ~ 2^%-2llu", field_name, |
4b94f5b7 | 5305 | *(u64 *)(key + key_field->offset)); |
de9a48a3 SRV |
5306 | } else if (key_field->flags & HIST_FIELD_FL_BUCKET) { |
5307 | unsigned long buckets = key_field->buckets; | |
5308 | uval = *(u64 *)(key + key_field->offset); | |
5309 | seq_printf(m, "%s: ~ %llu-%llu", field_name, | |
5310 | uval, uval + buckets -1); | |
0c4a6b46 | 5311 | } else if (key_field->flags & HIST_FIELD_FL_STRING) { |
85013256 | 5312 | seq_printf(m, "%s: %-50s", field_name, |
76a3b0c8 | 5313 | (char *)(key + key_field->offset)); |
7ef224d1 | 5314 | } else { |
76a3b0c8 | 5315 | uval = *(u64 *)(key + key_field->offset); |
85013256 | 5316 | seq_printf(m, "%s: %10llu", field_name, uval); |
7ef224d1 TZ |
5317 | } |
5318 | } | |
5319 | ||
69a0200c TZ |
5320 | if (!multiline) |
5321 | seq_puts(m, " "); | |
5322 | ||
5323 | seq_puts(m, "}"); | |
a3785b7e TZ |
5324 | } |
5325 | ||
abaa5258 MHG |
5326 | /* Get the 100 times of the percentage of @val in @total */ |
5327 | static inline unsigned int __get_percentage(u64 val, u64 total) | |
5328 | { | |
5329 | if (!total) | |
5330 | goto div0; | |
5331 | ||
5332 | if (val < (U64_MAX / 10000)) | |
5333 | return (unsigned int)div64_ul(val * 10000, total); | |
5334 | ||
5335 | total = div64_u64(total, 10000); | |
5336 | if (!total) | |
5337 | goto div0; | |
5338 | ||
5339 | return (unsigned int)div64_ul(val, total); | |
5340 | div0: | |
5341 | return val ? UINT_MAX : 0; | |
5342 | } | |
5343 | ||
a2c54256 MHG |
5344 | #define BAR_CHAR '#' |
5345 | ||
5346 | static inline const char *__fill_bar_str(char *buf, int size, u64 val, u64 max) | |
5347 | { | |
5348 | unsigned int len = __get_percentage(val, max); | |
5349 | int i; | |
5350 | ||
5351 | if (len == UINT_MAX) { | |
5352 | snprintf(buf, size, "[ERROR]"); | |
5353 | return buf; | |
5354 | } | |
5355 | ||
5356 | len = len * size / 10000; | |
5357 | for (i = 0; i < len && i < size; i++) | |
5358 | buf[i] = BAR_CHAR; | |
5359 | while (i < size) | |
5360 | buf[i++] = ' '; | |
5361 | buf[size] = '\0'; | |
5362 | ||
5363 | return buf; | |
5364 | } | |
5365 | ||
5366 | struct hist_val_stat { | |
5367 | u64 max; | |
5368 | u64 total; | |
5369 | }; | |
5370 | ||
abaa5258 MHG |
5371 | static void hist_trigger_print_val(struct seq_file *m, unsigned int idx, |
5372 | const char *field_name, unsigned long flags, | |
a2c54256 MHG |
5373 | struct hist_val_stat *stats, |
5374 | struct tracing_map_elt *elt) | |
abaa5258 MHG |
5375 | { |
5376 | u64 val = tracing_map_read_sum(elt, idx); | |
5377 | unsigned int pc; | |
a2c54256 | 5378 | char bar[21]; |
abaa5258 MHG |
5379 | |
5380 | if (flags & HIST_FIELD_FL_PERCENT) { | |
a2c54256 | 5381 | pc = __get_percentage(val, stats[idx].total); |
abaa5258 MHG |
5382 | if (pc == UINT_MAX) |
5383 | seq_printf(m, " %s (%%):[ERROR]", field_name); | |
5384 | else | |
5385 | seq_printf(m, " %s (%%): %3u.%02u", field_name, | |
5386 | pc / 100, pc % 100); | |
a2c54256 MHG |
5387 | } else if (flags & HIST_FIELD_FL_GRAPH) { |
5388 | seq_printf(m, " %s: %20s", field_name, | |
5389 | __fill_bar_str(bar, 20, val, stats[idx].max)); | |
abaa5258 MHG |
5390 | } else if (flags & HIST_FIELD_FL_HEX) { |
5391 | seq_printf(m, " %s: %10llx", field_name, val); | |
5392 | } else { | |
5393 | seq_printf(m, " %s: %10llu", field_name, val); | |
5394 | } | |
5395 | } | |
5396 | ||
a3785b7e TZ |
5397 | static void hist_trigger_entry_print(struct seq_file *m, |
5398 | struct hist_trigger_data *hist_data, | |
a2c54256 | 5399 | struct hist_val_stat *stats, |
a3785b7e TZ |
5400 | void *key, |
5401 | struct tracing_map_elt *elt) | |
5402 | { | |
5403 | const char *field_name; | |
abaa5258 MHG |
5404 | unsigned int i = HITCOUNT_IDX; |
5405 | unsigned long flags; | |
a3785b7e TZ |
5406 | |
5407 | hist_trigger_print_key(m, hist_data, key, elt); | |
7ef224d1 | 5408 | |
ccf47f5c MHG |
5409 | /* At first, show the raw hitcount if !nohitcount */ |
5410 | if (!hist_data->attrs->no_hitcount) | |
5411 | hist_trigger_print_val(m, i, "hitcount", 0, stats, elt); | |
7ef224d1 | 5412 | |
f2606835 | 5413 | for (i = 1; i < hist_data->n_vals; i++) { |
85013256 | 5414 | field_name = hist_field_name(hist_data->fields[i], 0); |
abaa5258 | 5415 | flags = hist_data->fields[i]->flags; |
abaa5258 | 5416 | if (flags & HIST_FIELD_FL_VAR || flags & HIST_FIELD_FL_EXPR) |
30350d65 TZ |
5417 | continue; |
5418 | ||
abaa5258 | 5419 | seq_puts(m, " "); |
a2c54256 | 5420 | hist_trigger_print_val(m, i, field_name, flags, stats, elt); |
f2606835 TZ |
5421 | } |
5422 | ||
50450603 TZ |
5423 | print_actions(m, hist_data, elt); |
5424 | ||
7ef224d1 TZ |
5425 | seq_puts(m, "\n"); |
5426 | } | |
5427 | ||
5428 | static int print_entries(struct seq_file *m, | |
5429 | struct hist_trigger_data *hist_data) | |
5430 | { | |
5431 | struct tracing_map_sort_entry **sort_entries = NULL; | |
5432 | struct tracing_map *map = hist_data->map; | |
abaa5258 | 5433 | int i, j, n_entries; |
a2c54256 MHG |
5434 | struct hist_val_stat *stats = NULL; |
5435 | u64 val; | |
7ef224d1 TZ |
5436 | |
5437 | n_entries = tracing_map_sort_entries(map, hist_data->sort_keys, | |
5438 | hist_data->n_sort_keys, | |
5439 | &sort_entries); | |
5440 | if (n_entries < 0) | |
5441 | return n_entries; | |
5442 | ||
a2c54256 | 5443 | /* Calculate the max and the total for each field if needed. */ |
abaa5258 | 5444 | for (j = 0; j < hist_data->n_vals; j++) { |
a2c54256 MHG |
5445 | if (!(hist_data->fields[j]->flags & |
5446 | (HIST_FIELD_FL_PERCENT | HIST_FIELD_FL_GRAPH))) | |
abaa5258 | 5447 | continue; |
a2c54256 MHG |
5448 | if (!stats) { |
5449 | stats = kcalloc(hist_data->n_vals, sizeof(*stats), | |
5450 | GFP_KERNEL); | |
5451 | if (!stats) { | |
abaa5258 MHG |
5452 | n_entries = -ENOMEM; |
5453 | goto out; | |
5454 | } | |
5455 | } | |
a2c54256 MHG |
5456 | for (i = 0; i < n_entries; i++) { |
5457 | val = tracing_map_read_sum(sort_entries[i]->elt, j); | |
5458 | stats[j].total += val; | |
5459 | if (stats[j].max < val) | |
5460 | stats[j].max = val; | |
5461 | } | |
abaa5258 MHG |
5462 | } |
5463 | ||
7ef224d1 | 5464 | for (i = 0; i < n_entries; i++) |
a2c54256 | 5465 | hist_trigger_entry_print(m, hist_data, stats, |
7ef224d1 TZ |
5466 | sort_entries[i]->key, |
5467 | sort_entries[i]->elt); | |
5468 | ||
a2c54256 | 5469 | kfree(stats); |
abaa5258 | 5470 | out: |
7ef224d1 TZ |
5471 | tracing_map_destroy_sort_entries(sort_entries, n_entries); |
5472 | ||
5473 | return n_entries; | |
5474 | } | |
5475 | ||
52a7f16d TZ |
5476 | static void hist_trigger_show(struct seq_file *m, |
5477 | struct event_trigger_data *data, int n) | |
7ef224d1 | 5478 | { |
7ef224d1 | 5479 | struct hist_trigger_data *hist_data; |
6e7a2398 | 5480 | int n_entries; |
7ef224d1 | 5481 | |
52a7f16d TZ |
5482 | if (n > 0) |
5483 | seq_puts(m, "\n\n"); | |
7ef224d1 TZ |
5484 | |
5485 | seq_puts(m, "# event histogram\n#\n# trigger info: "); | |
47670541 | 5486 | data->ops->print(m, data); |
52a7f16d | 5487 | seq_puts(m, "#\n\n"); |
7ef224d1 TZ |
5488 | |
5489 | hist_data = data->private_data; | |
5490 | n_entries = print_entries(m, hist_data); | |
6e7a2398 | 5491 | if (n_entries < 0) |
7ef224d1 | 5492 | n_entries = 0; |
7ef224d1 | 5493 | |
a3785b7e TZ |
5494 | track_data_snapshot_print(m, hist_data); |
5495 | ||
7ef224d1 TZ |
5496 | seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n", |
5497 | (u64)atomic64_read(&hist_data->map->hits), | |
5498 | n_entries, (u64)atomic64_read(&hist_data->map->drops)); | |
52a7f16d TZ |
5499 | } |
5500 | ||
5501 | static int hist_show(struct seq_file *m, void *v) | |
5502 | { | |
5503 | struct event_trigger_data *data; | |
5504 | struct trace_event_file *event_file; | |
5505 | int n = 0, ret = 0; | |
5506 | ||
5507 | mutex_lock(&event_mutex); | |
5508 | ||
5509 | event_file = event_file_data(m->private); | |
5510 | if (unlikely(!event_file)) { | |
5511 | ret = -ENODEV; | |
5512 | goto out_unlock; | |
5513 | } | |
5514 | ||
aeed8aa3 | 5515 | list_for_each_entry(data, &event_file->triggers, list) { |
52a7f16d TZ |
5516 | if (data->cmd_ops->trigger_type == ETT_EVENT_HIST) |
5517 | hist_trigger_show(m, data, n++); | |
5518 | } | |
5519 | ||
7ef224d1 TZ |
5520 | out_unlock: |
5521 | mutex_unlock(&event_mutex); | |
5522 | ||
5523 | return ret; | |
5524 | } | |
5525 | ||
5526 | static int event_hist_open(struct inode *inode, struct file *file) | |
5527 | { | |
17911ff3 SRV |
5528 | int ret; |
5529 | ||
5530 | ret = security_locked_down(LOCKDOWN_TRACEFS); | |
5531 | if (ret) | |
5532 | return ret; | |
5533 | ||
7ef224d1 TZ |
5534 | return single_open(file, hist_show, file); |
5535 | } | |
5536 | ||
5537 | const struct file_operations event_hist_fops = { | |
5538 | .open = event_hist_open, | |
5539 | .read = seq_read, | |
5540 | .llseek = seq_lseek, | |
5541 | .release = single_release, | |
5542 | }; | |
5543 | ||
2d19bd79 TZ |
5544 | #ifdef CONFIG_HIST_TRIGGERS_DEBUG |
5545 | static void hist_field_debug_show_flags(struct seq_file *m, | |
5546 | unsigned long flags) | |
5547 | { | |
5548 | seq_puts(m, " flags:\n"); | |
5549 | ||
5550 | if (flags & HIST_FIELD_FL_KEY) | |
5551 | seq_puts(m, " HIST_FIELD_FL_KEY\n"); | |
5552 | else if (flags & HIST_FIELD_FL_HITCOUNT) | |
5553 | seq_puts(m, " VAL: HIST_FIELD_FL_HITCOUNT\n"); | |
5554 | else if (flags & HIST_FIELD_FL_VAR) | |
5555 | seq_puts(m, " HIST_FIELD_FL_VAR\n"); | |
5556 | else if (flags & HIST_FIELD_FL_VAR_REF) | |
5557 | seq_puts(m, " HIST_FIELD_FL_VAR_REF\n"); | |
5558 | else | |
5559 | seq_puts(m, " VAL: normal u64 value\n"); | |
5560 | ||
5561 | if (flags & HIST_FIELD_FL_ALIAS) | |
5562 | seq_puts(m, " HIST_FIELD_FL_ALIAS\n"); | |
52cfb373 KS |
5563 | else if (flags & HIST_FIELD_FL_CONST) |
5564 | seq_puts(m, " HIST_FIELD_FL_CONST\n"); | |
2d19bd79 TZ |
5565 | } |
5566 | ||
5567 | static int hist_field_debug_show(struct seq_file *m, | |
5568 | struct hist_field *field, unsigned long flags) | |
5569 | { | |
5570 | if ((field->flags & flags) != flags) { | |
5571 | seq_printf(m, "ERROR: bad flags - %lx\n", flags); | |
5572 | return -EINVAL; | |
5573 | } | |
5574 | ||
5575 | hist_field_debug_show_flags(m, field->flags); | |
5576 | if (field->field) | |
5577 | seq_printf(m, " ftrace_event_field name: %s\n", | |
5578 | field->field->name); | |
5579 | ||
5580 | if (field->flags & HIST_FIELD_FL_VAR) { | |
5581 | seq_printf(m, " var.name: %s\n", field->var.name); | |
5582 | seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n", | |
5583 | field->var.idx); | |
5584 | } | |
5585 | ||
52cfb373 KS |
5586 | if (field->flags & HIST_FIELD_FL_CONST) |
5587 | seq_printf(m, " constant: %llu\n", field->constant); | |
5588 | ||
2d19bd79 TZ |
5589 | if (field->flags & HIST_FIELD_FL_ALIAS) |
5590 | seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n", | |
5591 | field->var_ref_idx); | |
5592 | ||
5593 | if (field->flags & HIST_FIELD_FL_VAR_REF) { | |
5594 | seq_printf(m, " name: %s\n", field->name); | |
5595 | seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n", | |
5596 | field->var.idx); | |
5597 | seq_printf(m, " var.hist_data: %p\n", field->var.hist_data); | |
5598 | seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n", | |
5599 | field->var_ref_idx); | |
5600 | if (field->system) | |
5601 | seq_printf(m, " system: %s\n", field->system); | |
5602 | if (field->event_name) | |
5603 | seq_printf(m, " event_name: %s\n", field->event_name); | |
5604 | } | |
5605 | ||
5606 | seq_printf(m, " type: %s\n", field->type); | |
5607 | seq_printf(m, " size: %u\n", field->size); | |
5608 | seq_printf(m, " is_signed: %u\n", field->is_signed); | |
5609 | ||
5610 | return 0; | |
5611 | } | |
5612 | ||
5613 | static int field_var_debug_show(struct seq_file *m, | |
5614 | struct field_var *field_var, unsigned int i, | |
5615 | bool save_vars) | |
5616 | { | |
5617 | const char *vars_name = save_vars ? "save_vars" : "field_vars"; | |
5618 | struct hist_field *field; | |
5619 | int ret = 0; | |
5620 | ||
5621 | seq_printf(m, "\n hist_data->%s[%d]:\n", vars_name, i); | |
5622 | ||
5623 | field = field_var->var; | |
5624 | ||
5625 | seq_printf(m, "\n %s[%d].var:\n", vars_name, i); | |
5626 | ||
5627 | hist_field_debug_show_flags(m, field->flags); | |
5628 | seq_printf(m, " var.name: %s\n", field->var.name); | |
5629 | seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n", | |
5630 | field->var.idx); | |
5631 | ||
5632 | field = field_var->val; | |
5633 | ||
5634 | seq_printf(m, "\n %s[%d].val:\n", vars_name, i); | |
5635 | if (field->field) | |
5636 | seq_printf(m, " ftrace_event_field name: %s\n", | |
5637 | field->field->name); | |
5638 | else { | |
5639 | ret = -EINVAL; | |
5640 | goto out; | |
5641 | } | |
5642 | ||
5643 | seq_printf(m, " type: %s\n", field->type); | |
5644 | seq_printf(m, " size: %u\n", field->size); | |
5645 | seq_printf(m, " is_signed: %u\n", field->is_signed); | |
5646 | out: | |
5647 | return ret; | |
5648 | } | |
5649 | ||
5650 | static int hist_action_debug_show(struct seq_file *m, | |
5651 | struct action_data *data, int i) | |
5652 | { | |
5653 | int ret = 0; | |
5654 | ||
5655 | if (data->handler == HANDLER_ONMAX || | |
5656 | data->handler == HANDLER_ONCHANGE) { | |
5657 | seq_printf(m, "\n hist_data->actions[%d].track_data.var_ref:\n", i); | |
5658 | ret = hist_field_debug_show(m, data->track_data.var_ref, | |
5659 | HIST_FIELD_FL_VAR_REF); | |
5660 | if (ret) | |
5661 | goto out; | |
5662 | ||
5663 | seq_printf(m, "\n hist_data->actions[%d].track_data.track_var:\n", i); | |
5664 | ret = hist_field_debug_show(m, data->track_data.track_var, | |
5665 | HIST_FIELD_FL_VAR); | |
5666 | if (ret) | |
5667 | goto out; | |
5668 | } | |
5669 | ||
5670 | if (data->handler == HANDLER_ONMATCH) { | |
5671 | seq_printf(m, "\n hist_data->actions[%d].match_data.event_system: %s\n", | |
5672 | i, data->match_data.event_system); | |
5673 | seq_printf(m, " hist_data->actions[%d].match_data.event: %s\n", | |
5674 | i, data->match_data.event); | |
5675 | } | |
5676 | out: | |
5677 | return ret; | |
5678 | } | |
5679 | ||
5680 | static int hist_actions_debug_show(struct seq_file *m, | |
5681 | struct hist_trigger_data *hist_data) | |
5682 | { | |
5683 | int i, ret = 0; | |
5684 | ||
5685 | if (hist_data->n_actions) | |
5686 | seq_puts(m, "\n action tracking variables (for onmax()/onchange()/onmatch()):\n"); | |
5687 | ||
5688 | for (i = 0; i < hist_data->n_actions; i++) { | |
5689 | struct action_data *action = hist_data->actions[i]; | |
5690 | ||
5691 | ret = hist_action_debug_show(m, action, i); | |
5692 | if (ret) | |
5693 | goto out; | |
5694 | } | |
5695 | ||
5696 | if (hist_data->n_save_vars) | |
5697 | seq_puts(m, "\n save action variables (save() params):\n"); | |
5698 | ||
5699 | for (i = 0; i < hist_data->n_save_vars; i++) { | |
5700 | ret = field_var_debug_show(m, hist_data->save_vars[i], i, true); | |
5701 | if (ret) | |
5702 | goto out; | |
5703 | } | |
5704 | out: | |
5705 | return ret; | |
5706 | } | |
5707 | ||
5708 | static void hist_trigger_debug_show(struct seq_file *m, | |
5709 | struct event_trigger_data *data, int n) | |
5710 | { | |
5711 | struct hist_trigger_data *hist_data; | |
5712 | int i, ret; | |
5713 | ||
5714 | if (n > 0) | |
5715 | seq_puts(m, "\n\n"); | |
5716 | ||
5717 | seq_puts(m, "# event histogram\n#\n# trigger info: "); | |
47670541 | 5718 | data->ops->print(m, data); |
2d19bd79 TZ |
5719 | seq_puts(m, "#\n\n"); |
5720 | ||
5721 | hist_data = data->private_data; | |
5722 | ||
5723 | seq_printf(m, "hist_data: %p\n\n", hist_data); | |
5724 | seq_printf(m, " n_vals: %u\n", hist_data->n_vals); | |
5725 | seq_printf(m, " n_keys: %u\n", hist_data->n_keys); | |
5726 | seq_printf(m, " n_fields: %u\n", hist_data->n_fields); | |
5727 | ||
5728 | seq_puts(m, "\n val fields:\n\n"); | |
5729 | ||
5730 | seq_puts(m, " hist_data->fields[0]:\n"); | |
5731 | ret = hist_field_debug_show(m, hist_data->fields[0], | |
5732 | HIST_FIELD_FL_HITCOUNT); | |
5733 | if (ret) | |
5734 | return; | |
5735 | ||
5736 | for (i = 1; i < hist_data->n_vals; i++) { | |
5737 | seq_printf(m, "\n hist_data->fields[%d]:\n", i); | |
5738 | ret = hist_field_debug_show(m, hist_data->fields[i], 0); | |
5739 | if (ret) | |
5740 | return; | |
5741 | } | |
5742 | ||
5743 | seq_puts(m, "\n key fields:\n"); | |
5744 | ||
5745 | for (i = hist_data->n_vals; i < hist_data->n_fields; i++) { | |
5746 | seq_printf(m, "\n hist_data->fields[%d]:\n", i); | |
5747 | ret = hist_field_debug_show(m, hist_data->fields[i], | |
5748 | HIST_FIELD_FL_KEY); | |
5749 | if (ret) | |
5750 | return; | |
5751 | } | |
5752 | ||
5753 | if (hist_data->n_var_refs) | |
5754 | seq_puts(m, "\n variable reference fields:\n"); | |
5755 | ||
5756 | for (i = 0; i < hist_data->n_var_refs; i++) { | |
5757 | seq_printf(m, "\n hist_data->var_refs[%d]:\n", i); | |
5758 | ret = hist_field_debug_show(m, hist_data->var_refs[i], | |
5759 | HIST_FIELD_FL_VAR_REF); | |
5760 | if (ret) | |
5761 | return; | |
5762 | } | |
5763 | ||
5764 | if (hist_data->n_field_vars) | |
5765 | seq_puts(m, "\n field variables:\n"); | |
5766 | ||
5767 | for (i = 0; i < hist_data->n_field_vars; i++) { | |
5768 | ret = field_var_debug_show(m, hist_data->field_vars[i], i, false); | |
5769 | if (ret) | |
5770 | return; | |
5771 | } | |
5772 | ||
5773 | ret = hist_actions_debug_show(m, hist_data); | |
5774 | if (ret) | |
5775 | return; | |
5776 | } | |
5777 | ||
5778 | static int hist_debug_show(struct seq_file *m, void *v) | |
5779 | { | |
5780 | struct event_trigger_data *data; | |
5781 | struct trace_event_file *event_file; | |
5782 | int n = 0, ret = 0; | |
5783 | ||
5784 | mutex_lock(&event_mutex); | |
5785 | ||
5786 | event_file = event_file_data(m->private); | |
5787 | if (unlikely(!event_file)) { | |
5788 | ret = -ENODEV; | |
5789 | goto out_unlock; | |
5790 | } | |
5791 | ||
5792 | list_for_each_entry(data, &event_file->triggers, list) { | |
5793 | if (data->cmd_ops->trigger_type == ETT_EVENT_HIST) | |
5794 | hist_trigger_debug_show(m, data, n++); | |
5795 | } | |
5796 | ||
5797 | out_unlock: | |
5798 | mutex_unlock(&event_mutex); | |
5799 | ||
5800 | return ret; | |
5801 | } | |
5802 | ||
5803 | static int event_hist_debug_open(struct inode *inode, struct file *file) | |
5804 | { | |
5805 | int ret; | |
5806 | ||
5807 | ret = security_locked_down(LOCKDOWN_TRACEFS); | |
5808 | if (ret) | |
5809 | return ret; | |
5810 | ||
5811 | return single_open(file, hist_debug_show, file); | |
5812 | } | |
5813 | ||
5814 | const struct file_operations event_hist_debug_fops = { | |
5815 | .open = event_hist_debug_open, | |
5816 | .read = seq_read, | |
5817 | .llseek = seq_lseek, | |
5818 | .release = single_release, | |
5819 | }; | |
5820 | #endif | |
5821 | ||
7ef224d1 TZ |
5822 | static void hist_field_print(struct seq_file *m, struct hist_field *hist_field) |
5823 | { | |
85013256 TZ |
5824 | const char *field_name = hist_field_name(hist_field, 0); |
5825 | ||
30350d65 TZ |
5826 | if (hist_field->var.name) |
5827 | seq_printf(m, "%s=", hist_field->var.name); | |
5828 | ||
0ae7961e | 5829 | if (hist_field->flags & HIST_FIELD_FL_CPU) |
1e3bac71 | 5830 | seq_puts(m, "common_cpu"); |
52cfb373 KS |
5831 | else if (hist_field->flags & HIST_FIELD_FL_CONST) |
5832 | seq_printf(m, "%llu", hist_field->constant); | |
067fe038 | 5833 | else if (field_name) { |
7e8b88a3 TZ |
5834 | if (hist_field->flags & HIST_FIELD_FL_VAR_REF || |
5835 | hist_field->flags & HIST_FIELD_FL_ALIAS) | |
067fe038 | 5836 | seq_putc(m, '$'); |
ad42febe | 5837 | seq_printf(m, "%s", field_name); |
0ae7961e TZ |
5838 | } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP) |
5839 | seq_puts(m, "common_timestamp"); | |
608940da TZ |
5840 | |
5841 | if (hist_field->flags) { | |
5842 | if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) && | |
5843 | !(hist_field->flags & HIST_FIELD_FL_EXPR)) { | |
5844 | const char *flags = get_hist_field_flags(hist_field); | |
5845 | ||
5846 | if (flags) | |
5847 | seq_printf(m, ".%s", flags); | |
5848 | } | |
5849 | } | |
de9a48a3 SRV |
5850 | if (hist_field->buckets) |
5851 | seq_printf(m, "=%ld", hist_field->buckets); | |
7ef224d1 TZ |
5852 | } |
5853 | ||
5854 | static int event_hist_trigger_print(struct seq_file *m, | |
7ef224d1 TZ |
5855 | struct event_trigger_data *data) |
5856 | { | |
5857 | struct hist_trigger_data *hist_data = data->private_data; | |
30350d65 TZ |
5858 | struct hist_field *field; |
5859 | bool have_var = false; | |
ccf47f5c | 5860 | bool show_val = false; |
7ef224d1 TZ |
5861 | unsigned int i; |
5862 | ||
edfeed31 | 5863 | seq_puts(m, HIST_PREFIX); |
5463bfda TZ |
5864 | |
5865 | if (data->name) | |
5866 | seq_printf(m, "%s:", data->name); | |
5867 | ||
5868 | seq_puts(m, "keys="); | |
7ef224d1 TZ |
5869 | |
5870 | for_each_hist_key_field(i, hist_data) { | |
30350d65 | 5871 | field = hist_data->fields[i]; |
7ef224d1 TZ |
5872 | |
5873 | if (i > hist_data->n_vals) | |
5874 | seq_puts(m, ","); | |
5875 | ||
30350d65 | 5876 | if (field->flags & HIST_FIELD_FL_STACKTRACE) |
69a0200c TZ |
5877 | seq_puts(m, "stacktrace"); |
5878 | else | |
30350d65 | 5879 | hist_field_print(m, field); |
7ef224d1 TZ |
5880 | } |
5881 | ||
5882 | seq_puts(m, ":vals="); | |
f2606835 TZ |
5883 | |
5884 | for_each_hist_val_field(i, hist_data) { | |
30350d65 TZ |
5885 | field = hist_data->fields[i]; |
5886 | if (field->flags & HIST_FIELD_FL_VAR) { | |
5887 | have_var = true; | |
5888 | continue; | |
5889 | } | |
5890 | ||
ccf47f5c MHG |
5891 | if (i == HITCOUNT_IDX) { |
5892 | if (hist_data->attrs->no_hitcount) | |
5893 | continue; | |
f2606835 | 5894 | seq_puts(m, "hitcount"); |
ccf47f5c MHG |
5895 | } else { |
5896 | if (show_val) | |
5897 | seq_puts(m, ","); | |
30350d65 TZ |
5898 | hist_field_print(m, field); |
5899 | } | |
ccf47f5c | 5900 | show_val = true; |
30350d65 TZ |
5901 | } |
5902 | ||
5903 | if (have_var) { | |
5904 | unsigned int n = 0; | |
5905 | ||
5906 | seq_puts(m, ":"); | |
5907 | ||
5908 | for_each_hist_val_field(i, hist_data) { | |
5909 | field = hist_data->fields[i]; | |
5910 | ||
5911 | if (field->flags & HIST_FIELD_FL_VAR) { | |
5912 | if (n++) | |
5913 | seq_puts(m, ","); | |
5914 | hist_field_print(m, field); | |
5915 | } | |
f2606835 TZ |
5916 | } |
5917 | } | |
7ef224d1 TZ |
5918 | |
5919 | seq_puts(m, ":sort="); | |
e62347d2 TZ |
5920 | |
5921 | for (i = 0; i < hist_data->n_sort_keys; i++) { | |
5922 | struct tracing_map_sort_key *sort_key; | |
30350d65 TZ |
5923 | unsigned int idx, first_key_idx; |
5924 | ||
5925 | /* skip VAR vals */ | |
5926 | first_key_idx = hist_data->n_vals - hist_data->n_vars; | |
e62347d2 TZ |
5927 | |
5928 | sort_key = &hist_data->sort_keys[i]; | |
ad42febe TZ |
5929 | idx = sort_key->field_idx; |
5930 | ||
1a361dfc | 5931 | if (WARN_ON(idx >= HIST_FIELDS_MAX)) |
ad42febe | 5932 | return -EINVAL; |
e62347d2 TZ |
5933 | |
5934 | if (i > 0) | |
5935 | seq_puts(m, ","); | |
5936 | ||
ad42febe | 5937 | if (idx == HITCOUNT_IDX) |
e62347d2 | 5938 | seq_puts(m, "hitcount"); |
30350d65 TZ |
5939 | else { |
5940 | if (idx >= first_key_idx) | |
5941 | idx += hist_data->n_vars; | |
e62347d2 | 5942 | hist_field_print(m, hist_data->fields[idx]); |
30350d65 | 5943 | } |
e62347d2 TZ |
5944 | |
5945 | if (sort_key->descending) | |
5946 | seq_puts(m, ".descending"); | |
5947 | } | |
7ef224d1 | 5948 | seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits)); |
a4072fe8 TZ |
5949 | if (hist_data->enable_timestamps) |
5950 | seq_printf(m, ":clock=%s", hist_data->attrs->clock); | |
ccf47f5c MHG |
5951 | if (hist_data->attrs->no_hitcount) |
5952 | seq_puts(m, ":nohitcount"); | |
7ef224d1 | 5953 | |
c282a386 TZ |
5954 | print_actions_spec(m, hist_data); |
5955 | ||
7ef224d1 TZ |
5956 | if (data->filter_str) |
5957 | seq_printf(m, " if %s", data->filter_str); | |
5958 | ||
83e99914 TZ |
5959 | if (data->paused) |
5960 | seq_puts(m, " [paused]"); | |
5961 | else | |
5962 | seq_puts(m, " [active]"); | |
7ef224d1 TZ |
5963 | |
5964 | seq_putc(m, '\n'); | |
5965 | ||
5966 | return 0; | |
5967 | } | |
5968 | ||
47670541 | 5969 | static int event_hist_trigger_init(struct event_trigger_data *data) |
5463bfda TZ |
5970 | { |
5971 | struct hist_trigger_data *hist_data = data->private_data; | |
5972 | ||
5973 | if (!data->ref && hist_data->attrs->name) | |
5974 | save_named_trigger(hist_data->attrs->name, data); | |
5975 | ||
5976 | data->ref++; | |
5977 | ||
5978 | return 0; | |
5979 | } | |
5980 | ||
02205a67 TZ |
5981 | static void unregister_field_var_hists(struct hist_trigger_data *hist_data) |
5982 | { | |
5983 | struct trace_event_file *file; | |
5984 | unsigned int i; | |
5985 | char *cmd; | |
5986 | int ret; | |
5987 | ||
5988 | for (i = 0; i < hist_data->n_field_var_hists; i++) { | |
5989 | file = hist_data->field_var_hists[i]->hist_data->event_file; | |
5990 | cmd = hist_data->field_var_hists[i]->cmd; | |
9ec5a7d1 TZ |
5991 | ret = event_hist_trigger_parse(&trigger_hist_cmd, file, |
5992 | "!hist", "hist", cmd); | |
6c610dba | 5993 | WARN_ON_ONCE(ret < 0); |
02205a67 TZ |
5994 | } |
5995 | } | |
5996 | ||
47670541 | 5997 | static void event_hist_trigger_free(struct event_trigger_data *data) |
7ef224d1 TZ |
5998 | { |
5999 | struct hist_trigger_data *hist_data = data->private_data; | |
6000 | ||
6001 | if (WARN_ON_ONCE(data->ref <= 0)) | |
6002 | return; | |
6003 | ||
6004 | data->ref--; | |
6005 | if (!data->ref) { | |
5463bfda TZ |
6006 | if (data->name) |
6007 | del_named_trigger(data); | |
067fe038 | 6008 | |
7ef224d1 | 6009 | trigger_data_free(data); |
067fe038 TZ |
6010 | |
6011 | remove_hist_vars(hist_data); | |
6012 | ||
02205a67 TZ |
6013 | unregister_field_var_hists(hist_data); |
6014 | ||
7ef224d1 TZ |
6015 | destroy_hist_data(hist_data); |
6016 | } | |
6017 | } | |
6018 | ||
6019 | static struct event_trigger_ops event_hist_trigger_ops = { | |
fb339e53 | 6020 | .trigger = event_hist_trigger, |
7ef224d1 | 6021 | .print = event_hist_trigger_print, |
5463bfda | 6022 | .init = event_hist_trigger_init, |
7ef224d1 TZ |
6023 | .free = event_hist_trigger_free, |
6024 | }; | |
6025 | ||
47670541 | 6026 | static int event_hist_trigger_named_init(struct event_trigger_data *data) |
5463bfda TZ |
6027 | { |
6028 | data->ref++; | |
6029 | ||
6030 | save_named_trigger(data->named_data->name, data); | |
6031 | ||
47670541 | 6032 | event_hist_trigger_init(data->named_data); |
5463bfda TZ |
6033 | |
6034 | return 0; | |
6035 | } | |
6036 | ||
47670541 | 6037 | static void event_hist_trigger_named_free(struct event_trigger_data *data) |
5463bfda TZ |
6038 | { |
6039 | if (WARN_ON_ONCE(data->ref <= 0)) | |
6040 | return; | |
6041 | ||
47670541 | 6042 | event_hist_trigger_free(data->named_data); |
5463bfda TZ |
6043 | |
6044 | data->ref--; | |
6045 | if (!data->ref) { | |
6046 | del_named_trigger(data); | |
6047 | trigger_data_free(data); | |
6048 | } | |
6049 | } | |
6050 | ||
6051 | static struct event_trigger_ops event_hist_trigger_named_ops = { | |
fb339e53 | 6052 | .trigger = event_hist_trigger, |
5463bfda TZ |
6053 | .print = event_hist_trigger_print, |
6054 | .init = event_hist_trigger_named_init, | |
6055 | .free = event_hist_trigger_named_free, | |
6056 | }; | |
6057 | ||
7ef224d1 TZ |
6058 | static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd, |
6059 | char *param) | |
6060 | { | |
6061 | return &event_hist_trigger_ops; | |
6062 | } | |
6063 | ||
e86ae9ba TZ |
6064 | static void hist_clear(struct event_trigger_data *data) |
6065 | { | |
6066 | struct hist_trigger_data *hist_data = data->private_data; | |
e86ae9ba | 6067 | |
5463bfda TZ |
6068 | if (data->name) |
6069 | pause_named_trigger(data); | |
e86ae9ba | 6070 | |
e0a568dc | 6071 | tracepoint_synchronize_unregister(); |
e86ae9ba TZ |
6072 | |
6073 | tracing_map_clear(hist_data->map); | |
6074 | ||
5463bfda TZ |
6075 | if (data->name) |
6076 | unpause_named_trigger(data); | |
6077 | } | |
6078 | ||
6079 | static bool compatible_field(struct ftrace_event_field *field, | |
6080 | struct ftrace_event_field *test_field) | |
6081 | { | |
6082 | if (field == test_field) | |
6083 | return true; | |
6084 | if (field == NULL || test_field == NULL) | |
6085 | return false; | |
6086 | if (strcmp(field->name, test_field->name) != 0) | |
6087 | return false; | |
6088 | if (strcmp(field->type, test_field->type) != 0) | |
6089 | return false; | |
6090 | if (field->size != test_field->size) | |
6091 | return false; | |
6092 | if (field->is_signed != test_field->is_signed) | |
6093 | return false; | |
6094 | ||
6095 | return true; | |
e86ae9ba TZ |
6096 | } |
6097 | ||
52a7f16d | 6098 | static bool hist_trigger_match(struct event_trigger_data *data, |
5463bfda TZ |
6099 | struct event_trigger_data *data_test, |
6100 | struct event_trigger_data *named_data, | |
6101 | bool ignore_filter) | |
52a7f16d TZ |
6102 | { |
6103 | struct tracing_map_sort_key *sort_key, *sort_key_test; | |
6104 | struct hist_trigger_data *hist_data, *hist_data_test; | |
6105 | struct hist_field *key_field, *key_field_test; | |
6106 | unsigned int i; | |
6107 | ||
5463bfda TZ |
6108 | if (named_data && (named_data != data_test) && |
6109 | (named_data != data_test->named_data)) | |
6110 | return false; | |
6111 | ||
6112 | if (!named_data && is_named_trigger(data_test)) | |
6113 | return false; | |
6114 | ||
52a7f16d TZ |
6115 | hist_data = data->private_data; |
6116 | hist_data_test = data_test->private_data; | |
6117 | ||
6118 | if (hist_data->n_vals != hist_data_test->n_vals || | |
6119 | hist_data->n_fields != hist_data_test->n_fields || | |
6120 | hist_data->n_sort_keys != hist_data_test->n_sort_keys) | |
6121 | return false; | |
6122 | ||
5463bfda TZ |
6123 | if (!ignore_filter) { |
6124 | if ((data->filter_str && !data_test->filter_str) || | |
6125 | (!data->filter_str && data_test->filter_str)) | |
6126 | return false; | |
6127 | } | |
52a7f16d TZ |
6128 | |
6129 | for_each_hist_field(i, hist_data) { | |
6130 | key_field = hist_data->fields[i]; | |
6131 | key_field_test = hist_data_test->fields[i]; | |
6132 | ||
6133 | if (key_field->flags != key_field_test->flags) | |
6134 | return false; | |
5463bfda | 6135 | if (!compatible_field(key_field->field, key_field_test->field)) |
52a7f16d TZ |
6136 | return false; |
6137 | if (key_field->offset != key_field_test->offset) | |
6138 | return false; | |
ad42febe TZ |
6139 | if (key_field->size != key_field_test->size) |
6140 | return false; | |
6141 | if (key_field->is_signed != key_field_test->is_signed) | |
6142 | return false; | |
1a361dfc TZ |
6143 | if (!!key_field->var.name != !!key_field_test->var.name) |
6144 | return false; | |
6145 | if (key_field->var.name && | |
6146 | strcmp(key_field->var.name, key_field_test->var.name) != 0) | |
6147 | return false; | |
52a7f16d TZ |
6148 | } |
6149 | ||
6150 | for (i = 0; i < hist_data->n_sort_keys; i++) { | |
6151 | sort_key = &hist_data->sort_keys[i]; | |
6152 | sort_key_test = &hist_data_test->sort_keys[i]; | |
6153 | ||
6154 | if (sort_key->field_idx != sort_key_test->field_idx || | |
6155 | sort_key->descending != sort_key_test->descending) | |
6156 | return false; | |
6157 | } | |
6158 | ||
5463bfda | 6159 | if (!ignore_filter && data->filter_str && |
52a7f16d TZ |
6160 | (strcmp(data->filter_str, data_test->filter_str) != 0)) |
6161 | return false; | |
6162 | ||
48f79473 TZ |
6163 | if (!actions_match(hist_data, hist_data_test)) |
6164 | return false; | |
6165 | ||
52a7f16d TZ |
6166 | return true; |
6167 | } | |
6168 | ||
a7e6b7dc TZ |
6169 | static bool existing_hist_update_only(char *glob, |
6170 | struct event_trigger_data *data, | |
6171 | struct trace_event_file *file) | |
6172 | { | |
6173 | struct hist_trigger_data *hist_data = data->private_data; | |
6174 | struct event_trigger_data *test, *named_data = NULL; | |
6175 | bool updated = false; | |
6176 | ||
6177 | if (!hist_data->attrs->pause && !hist_data->attrs->cont && | |
6178 | !hist_data->attrs->clear) | |
6179 | goto out; | |
6180 | ||
6181 | if (hist_data->attrs->name) { | |
6182 | named_data = find_named_trigger(hist_data->attrs->name); | |
6183 | if (named_data) { | |
6184 | if (!hist_trigger_match(data, named_data, named_data, | |
6185 | true)) | |
6186 | goto out; | |
6187 | } | |
6188 | } | |
6189 | ||
6190 | if (hist_data->attrs->name && !named_data) | |
6191 | goto out; | |
6192 | ||
6193 | list_for_each_entry(test, &file->triggers, list) { | |
6194 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
6195 | if (!hist_trigger_match(data, test, named_data, false)) | |
6196 | continue; | |
6197 | if (hist_data->attrs->pause) | |
6198 | test->paused = true; | |
6199 | else if (hist_data->attrs->cont) | |
6200 | test->paused = false; | |
6201 | else if (hist_data->attrs->clear) | |
6202 | hist_clear(test); | |
6203 | updated = true; | |
6204 | goto out; | |
6205 | } | |
6206 | } | |
6207 | out: | |
6208 | return updated; | |
6209 | } | |
6210 | ||
2378a2d6 | 6211 | static int hist_register_trigger(char *glob, |
7ef224d1 TZ |
6212 | struct event_trigger_data *data, |
6213 | struct trace_event_file *file) | |
6214 | { | |
83e99914 | 6215 | struct hist_trigger_data *hist_data = data->private_data; |
5463bfda | 6216 | struct event_trigger_data *test, *named_data = NULL; |
d0cd871b | 6217 | struct trace_array *tr = file->tr; |
7ef224d1 TZ |
6218 | int ret = 0; |
6219 | ||
5463bfda TZ |
6220 | if (hist_data->attrs->name) { |
6221 | named_data = find_named_trigger(hist_data->attrs->name); | |
6222 | if (named_data) { | |
6223 | if (!hist_trigger_match(data, named_data, named_data, | |
6224 | true)) { | |
d0cd871b | 6225 | hist_err(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name)); |
5463bfda TZ |
6226 | ret = -EINVAL; |
6227 | goto out; | |
6228 | } | |
6229 | } | |
6230 | } | |
6231 | ||
6232 | if (hist_data->attrs->name && !named_data) | |
6233 | goto new; | |
6234 | ||
aeed8aa3 MH |
6235 | lockdep_assert_held(&event_mutex); |
6236 | ||
6237 | list_for_each_entry(test, &file->triggers, list) { | |
7ef224d1 | 6238 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
a7e6b7dc | 6239 | if (hist_trigger_match(data, test, named_data, false)) { |
d0cd871b | 6240 | hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0); |
83e99914 | 6241 | ret = -EEXIST; |
a7e6b7dc | 6242 | goto out; |
f404da6e | 6243 | } |
7ef224d1 TZ |
6244 | } |
6245 | } | |
5463bfda | 6246 | new: |
e86ae9ba | 6247 | if (hist_data->attrs->cont || hist_data->attrs->clear) { |
d0cd871b | 6248 | hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0); |
83e99914 TZ |
6249 | ret = -ENOENT; |
6250 | goto out; | |
6251 | } | |
6252 | ||
7522c03a TZ |
6253 | if (hist_data->attrs->pause) |
6254 | data->paused = true; | |
6255 | ||
5463bfda | 6256 | if (named_data) { |
5463bfda TZ |
6257 | data->private_data = named_data->private_data; |
6258 | set_named_trigger_data(data, named_data); | |
6259 | data->ops = &event_hist_trigger_named_ops; | |
6260 | } | |
6261 | ||
7ef224d1 | 6262 | if (data->ops->init) { |
47670541 | 6263 | ret = data->ops->init(data); |
7ef224d1 TZ |
6264 | if (ret < 0) |
6265 | goto out; | |
6266 | } | |
6267 | ||
a4072fe8 TZ |
6268 | if (hist_data->enable_timestamps) { |
6269 | char *clock = hist_data->attrs->clock; | |
6270 | ||
6271 | ret = tracing_set_clock(file->tr, hist_data->attrs->clock); | |
6272 | if (ret) { | |
d0cd871b | 6273 | hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock)); |
a4072fe8 TZ |
6274 | goto out; |
6275 | } | |
7ef224d1 | 6276 | |
b94bc80d | 6277 | tracing_set_filter_buffering(file->tr, true); |
a4072fe8 TZ |
6278 | } |
6279 | ||
6280 | if (named_data) | |
6281 | destroy_hist_data(hist_data); | |
067fe038 TZ |
6282 | out: |
6283 | return ret; | |
6284 | } | |
6285 | ||
6286 | static int hist_trigger_enable(struct event_trigger_data *data, | |
6287 | struct trace_event_file *file) | |
6288 | { | |
6289 | int ret = 0; | |
6290 | ||
6291 | list_add_tail_rcu(&data->list, &file->triggers); | |
6292 | ||
6293 | update_cond_flag(file); | |
ad42febe | 6294 | |
7ef224d1 TZ |
6295 | if (trace_event_trigger_enable_disable(file, 1) < 0) { |
6296 | list_del_rcu(&data->list); | |
6297 | update_cond_flag(file); | |
6298 | ret--; | |
6299 | } | |
067fe038 | 6300 | |
7ef224d1 TZ |
6301 | return ret; |
6302 | } | |
6303 | ||
4b147936 TZ |
6304 | static bool have_hist_trigger_match(struct event_trigger_data *data, |
6305 | struct trace_event_file *file) | |
6306 | { | |
6307 | struct hist_trigger_data *hist_data = data->private_data; | |
6308 | struct event_trigger_data *test, *named_data = NULL; | |
6309 | bool match = false; | |
6310 | ||
aeed8aa3 MH |
6311 | lockdep_assert_held(&event_mutex); |
6312 | ||
4b147936 TZ |
6313 | if (hist_data->attrs->name) |
6314 | named_data = find_named_trigger(hist_data->attrs->name); | |
6315 | ||
aeed8aa3 | 6316 | list_for_each_entry(test, &file->triggers, list) { |
4b147936 TZ |
6317 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6318 | if (hist_trigger_match(data, test, named_data, false)) { | |
6319 | match = true; | |
6320 | break; | |
6321 | } | |
6322 | } | |
6323 | } | |
6324 | ||
6325 | return match; | |
6326 | } | |
6327 | ||
067fe038 TZ |
6328 | static bool hist_trigger_check_refs(struct event_trigger_data *data, |
6329 | struct trace_event_file *file) | |
6330 | { | |
6331 | struct hist_trigger_data *hist_data = data->private_data; | |
6332 | struct event_trigger_data *test, *named_data = NULL; | |
6333 | ||
aeed8aa3 MH |
6334 | lockdep_assert_held(&event_mutex); |
6335 | ||
067fe038 TZ |
6336 | if (hist_data->attrs->name) |
6337 | named_data = find_named_trigger(hist_data->attrs->name); | |
6338 | ||
aeed8aa3 | 6339 | list_for_each_entry(test, &file->triggers, list) { |
067fe038 TZ |
6340 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6341 | if (!hist_trigger_match(data, test, named_data, false)) | |
6342 | continue; | |
6343 | hist_data = test->private_data; | |
6344 | if (check_var_refs(hist_data)) | |
6345 | return true; | |
6346 | break; | |
6347 | } | |
6348 | } | |
6349 | ||
6350 | return false; | |
6351 | } | |
6352 | ||
2378a2d6 | 6353 | static void hist_unregister_trigger(char *glob, |
52a7f16d TZ |
6354 | struct event_trigger_data *data, |
6355 | struct trace_event_file *file) | |
6356 | { | |
45e333ce | 6357 | struct event_trigger_data *test = NULL, *iter, *named_data = NULL; |
5463bfda | 6358 | struct hist_trigger_data *hist_data = data->private_data; |
52a7f16d | 6359 | |
aeed8aa3 MH |
6360 | lockdep_assert_held(&event_mutex); |
6361 | ||
5463bfda TZ |
6362 | if (hist_data->attrs->name) |
6363 | named_data = find_named_trigger(hist_data->attrs->name); | |
6364 | ||
45e333ce JK |
6365 | list_for_each_entry(iter, &file->triggers, list) { |
6366 | if (iter->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
6367 | if (!hist_trigger_match(data, iter, named_data, false)) | |
52a7f16d | 6368 | continue; |
45e333ce | 6369 | test = iter; |
52a7f16d TZ |
6370 | list_del_rcu(&test->list); |
6371 | trace_event_trigger_enable_disable(file, 0); | |
6372 | update_cond_flag(file); | |
6373 | break; | |
6374 | } | |
6375 | } | |
6376 | ||
45e333ce | 6377 | if (test && test->ops->free) |
47670541 | 6378 | test->ops->free(test); |
ad42febe TZ |
6379 | |
6380 | if (hist_data->enable_timestamps) { | |
45e333ce | 6381 | if (!hist_data->remove || test) |
b94bc80d | 6382 | tracing_set_filter_buffering(file->tr, false); |
ad42febe | 6383 | } |
52a7f16d TZ |
6384 | } |
6385 | ||
067fe038 TZ |
6386 | static bool hist_file_check_refs(struct trace_event_file *file) |
6387 | { | |
6388 | struct hist_trigger_data *hist_data; | |
6389 | struct event_trigger_data *test; | |
6390 | ||
aeed8aa3 MH |
6391 | lockdep_assert_held(&event_mutex); |
6392 | ||
6393 | list_for_each_entry(test, &file->triggers, list) { | |
067fe038 TZ |
6394 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6395 | hist_data = test->private_data; | |
6396 | if (check_var_refs(hist_data)) | |
6397 | return true; | |
6398 | } | |
6399 | } | |
6400 | ||
6401 | return false; | |
6402 | } | |
6403 | ||
52a7f16d TZ |
6404 | static void hist_unreg_all(struct trace_event_file *file) |
6405 | { | |
47c18569 | 6406 | struct event_trigger_data *test, *n; |
ad42febe | 6407 | struct hist_trigger_data *hist_data; |
4b147936 TZ |
6408 | struct synth_event *se; |
6409 | const char *se_name; | |
52a7f16d | 6410 | |
0e2b81f7 MH |
6411 | lockdep_assert_held(&event_mutex); |
6412 | ||
067fe038 TZ |
6413 | if (hist_file_check_refs(file)) |
6414 | return; | |
6415 | ||
47c18569 | 6416 | list_for_each_entry_safe(test, n, &file->triggers, list) { |
52a7f16d | 6417 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
ad42febe | 6418 | hist_data = test->private_data; |
52a7f16d TZ |
6419 | list_del_rcu(&test->list); |
6420 | trace_event_trigger_enable_disable(file, 0); | |
4b147936 | 6421 | |
4b147936 TZ |
6422 | se_name = trace_event_name(file->event_call); |
6423 | se = find_synth_event(se_name); | |
6424 | if (se) | |
6425 | se->ref--; | |
4b147936 | 6426 | |
52a7f16d | 6427 | update_cond_flag(file); |
ad42febe | 6428 | if (hist_data->enable_timestamps) |
b94bc80d | 6429 | tracing_set_filter_buffering(file->tr, false); |
52a7f16d | 6430 | if (test->ops->free) |
47670541 | 6431 | test->ops->free(test); |
52a7f16d TZ |
6432 | } |
6433 | } | |
6434 | } | |
6435 | ||
9ec5a7d1 TZ |
6436 | static int event_hist_trigger_parse(struct event_command *cmd_ops, |
6437 | struct trace_event_file *file, | |
e1f187d0 TZ |
6438 | char *glob, char *cmd, |
6439 | char *param_and_filter) | |
7ef224d1 TZ |
6440 | { |
6441 | unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT; | |
6442 | struct event_trigger_data *trigger_data; | |
6443 | struct hist_trigger_attrs *attrs; | |
7ef224d1 | 6444 | struct hist_trigger_data *hist_data; |
e1f187d0 | 6445 | char *param, *filter, *p, *start; |
4b147936 TZ |
6446 | struct synth_event *se; |
6447 | const char *se_name; | |
e1f187d0 | 6448 | bool remove; |
7ef224d1 TZ |
6449 | int ret = 0; |
6450 | ||
0e2b81f7 MH |
6451 | lockdep_assert_held(&event_mutex); |
6452 | ||
97a5d2e5 AF |
6453 | if (WARN_ON(!glob)) |
6454 | return -EINVAL; | |
798a5b6c | 6455 | |
69686fcb | 6456 | if (glob[0]) { |
f404da6e | 6457 | hist_err_clear(); |
e1f187d0 | 6458 | last_cmd_set(file, param_and_filter); |
f404da6e TZ |
6459 | } |
6460 | ||
e1f187d0 | 6461 | remove = event_trigger_check_remove(glob); |
7ef224d1 | 6462 | |
e1f187d0 TZ |
6463 | if (event_trigger_empty_param(param_and_filter)) |
6464 | return -EINVAL; | |
30350d65 | 6465 | |
ec5ce098 TZ |
6466 | /* |
6467 | * separate the trigger from the filter (k:v [if filter]) | |
6468 | * allowing for whitespace in the trigger | |
6469 | */ | |
e1f187d0 | 6470 | p = param = param_and_filter; |
ec5ce098 TZ |
6471 | do { |
6472 | p = strstr(p, "if"); | |
6473 | if (!p) | |
6474 | break; | |
e1f187d0 | 6475 | if (p == param_and_filter) |
ec5ce098 TZ |
6476 | return -EINVAL; |
6477 | if (*(p - 1) != ' ' && *(p - 1) != '\t') { | |
6478 | p++; | |
6479 | continue; | |
6480 | } | |
e1f187d0 | 6481 | if (p >= param_and_filter + strlen(param_and_filter) - (sizeof("if") - 1) - 1) |
ec5ce098 | 6482 | return -EINVAL; |
2f31ed93 | 6483 | if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') { |
ec5ce098 TZ |
6484 | p++; |
6485 | continue; | |
6486 | } | |
6487 | break; | |
b59f2f2b | 6488 | } while (1); |
ec5ce098 TZ |
6489 | |
6490 | if (!p) | |
e1f187d0 | 6491 | filter = NULL; |
ec5ce098 TZ |
6492 | else { |
6493 | *(p - 1) = '\0'; | |
e1f187d0 TZ |
6494 | filter = strstrip(p); |
6495 | param = strstrip(param); | |
ec5ce098 | 6496 | } |
7ef224d1 | 6497 | |
c5eac6ee KS |
6498 | /* |
6499 | * To simplify arithmetic expression parsing, replace occurrences of | |
6500 | * '.sym-offset' modifier with '.symXoffset' | |
6501 | */ | |
e1f187d0 | 6502 | start = strstr(param, ".sym-offset"); |
c5eac6ee KS |
6503 | while (start) { |
6504 | *(start + 4) = 'X'; | |
6505 | start = strstr(start + 11, ".sym-offset"); | |
feea69ec | 6506 | } |
c5eac6ee | 6507 | |
e1f187d0 | 6508 | attrs = parse_hist_trigger_attrs(file->tr, param); |
7ef224d1 TZ |
6509 | if (IS_ERR(attrs)) |
6510 | return PTR_ERR(attrs); | |
6511 | ||
6512 | if (attrs->map_bits) | |
6513 | hist_trigger_bits = attrs->map_bits; | |
6514 | ||
30350d65 | 6515 | hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove); |
7ef224d1 TZ |
6516 | if (IS_ERR(hist_data)) { |
6517 | destroy_hist_trigger_attrs(attrs); | |
6518 | return PTR_ERR(hist_data); | |
6519 | } | |
6520 | ||
e1f187d0 | 6521 | trigger_data = event_trigger_alloc(cmd_ops, cmd, param, hist_data); |
4b147936 TZ |
6522 | if (!trigger_data) { |
6523 | ret = -ENOMEM; | |
7ef224d1 | 6524 | goto out_free; |
4b147936 | 6525 | } |
7ef224d1 | 6526 | |
e1f187d0 TZ |
6527 | ret = event_trigger_set_filter(cmd_ops, file, filter, trigger_data); |
6528 | if (ret < 0) | |
6529 | goto out_free; | |
52a7f16d | 6530 | |
30350d65 | 6531 | if (remove) { |
4b147936 TZ |
6532 | if (!have_hist_trigger_match(trigger_data, file)) |
6533 | goto out_free; | |
6534 | ||
067fe038 TZ |
6535 | if (hist_trigger_check_refs(trigger_data, file)) { |
6536 | ret = -EBUSY; | |
6537 | goto out_free; | |
6538 | } | |
6539 | ||
b8cc44a4 | 6540 | event_trigger_unregister(cmd_ops, file, glob+1, trigger_data); |
4b147936 TZ |
6541 | se_name = trace_event_name(file->event_call); |
6542 | se = find_synth_event(se_name); | |
6543 | if (se) | |
6544 | se->ref--; | |
7ef224d1 TZ |
6545 | ret = 0; |
6546 | goto out_free; | |
6547 | } | |
6548 | ||
a7e6b7dc | 6549 | if (existing_hist_update_only(glob, trigger_data, file)) |
b8cc44a4 | 6550 | goto out_free; |
a7e6b7dc TZ |
6551 | |
6552 | ret = event_trigger_register(cmd_ops, file, glob, trigger_data); | |
6553 | if (ret < 0) | |
7ef224d1 | 6554 | goto out_free; |
067fe038 TZ |
6555 | |
6556 | if (get_named_trigger_data(trigger_data)) | |
6557 | goto enable; | |
6558 | ||
6559 | if (has_hist_vars(hist_data)) | |
6560 | save_hist_vars(hist_data); | |
6561 | ||
7d18a10c | 6562 | ret = create_actions(hist_data); |
0212e2aa TZ |
6563 | if (ret) |
6564 | goto out_unreg; | |
6565 | ||
067fe038 TZ |
6566 | ret = tracing_map_init(hist_data->map); |
6567 | if (ret) | |
6568 | goto out_unreg; | |
6569 | enable: | |
6570 | ret = hist_trigger_enable(trigger_data, file); | |
6571 | if (ret) | |
6572 | goto out_unreg; | |
6573 | ||
4b147936 TZ |
6574 | se_name = trace_event_name(file->event_call); |
6575 | se = find_synth_event(se_name); | |
6576 | if (se) | |
6577 | se->ref++; | |
7ef224d1 | 6578 | out: |
608c6ed3 | 6579 | if (ret == 0 && glob[0]) |
f404da6e TZ |
6580 | hist_err_clear(); |
6581 | ||
7ef224d1 | 6582 | return ret; |
067fe038 | 6583 | out_unreg: |
b8cc44a4 | 6584 | event_trigger_unregister(cmd_ops, file, glob+1, trigger_data); |
7ef224d1 | 6585 | out_free: |
e1f187d0 | 6586 | event_trigger_reset_filter(cmd_ops, trigger_data); |
7ef224d1 | 6587 | |
067fe038 TZ |
6588 | remove_hist_vars(hist_data); |
6589 | ||
7ef224d1 TZ |
6590 | kfree(trigger_data); |
6591 | ||
6592 | destroy_hist_data(hist_data); | |
6593 | goto out; | |
6594 | } | |
6595 | ||
6596 | static struct event_command trigger_hist_cmd = { | |
6597 | .name = "hist", | |
6598 | .trigger_type = ETT_EVENT_HIST, | |
6599 | .flags = EVENT_CMD_FL_NEEDS_REC, | |
9ec5a7d1 | 6600 | .parse = event_hist_trigger_parse, |
7ef224d1 | 6601 | .reg = hist_register_trigger, |
52a7f16d TZ |
6602 | .unreg = hist_unregister_trigger, |
6603 | .unreg_all = hist_unreg_all, | |
7ef224d1 TZ |
6604 | .get_trigger_ops = event_hist_get_trigger_ops, |
6605 | .set_filter = set_trigger_filter, | |
6606 | }; | |
6607 | ||
6608 | __init int register_trigger_hist_cmd(void) | |
6609 | { | |
6610 | int ret; | |
6611 | ||
6612 | ret = register_event_command(&trigger_hist_cmd); | |
6613 | WARN_ON(ret < 0); | |
6614 | ||
6615 | return ret; | |
6616 | } | |
d0bad49b TZ |
6617 | |
6618 | static void | |
b47e3302 SRV |
6619 | hist_enable_trigger(struct event_trigger_data *data, |
6620 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 6621 | struct ring_buffer_event *event) |
d0bad49b TZ |
6622 | { |
6623 | struct enable_trigger_data *enable_data = data->private_data; | |
6624 | struct event_trigger_data *test; | |
6625 | ||
aeed8aa3 MH |
6626 | list_for_each_entry_rcu(test, &enable_data->file->triggers, list, |
6627 | lockdep_is_held(&event_mutex)) { | |
d0bad49b TZ |
6628 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
6629 | if (enable_data->enable) | |
6630 | test->paused = false; | |
6631 | else | |
6632 | test->paused = true; | |
d0bad49b TZ |
6633 | } |
6634 | } | |
6635 | } | |
6636 | ||
6637 | static void | |
b47e3302 SRV |
6638 | hist_enable_count_trigger(struct event_trigger_data *data, |
6639 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 6640 | struct ring_buffer_event *event) |
d0bad49b TZ |
6641 | { |
6642 | if (!data->count) | |
6643 | return; | |
6644 | ||
6645 | if (data->count != -1) | |
6646 | (data->count)--; | |
6647 | ||
b47e3302 | 6648 | hist_enable_trigger(data, buffer, rec, event); |
d0bad49b TZ |
6649 | } |
6650 | ||
6651 | static struct event_trigger_ops hist_enable_trigger_ops = { | |
fb339e53 | 6652 | .trigger = hist_enable_trigger, |
d0bad49b TZ |
6653 | .print = event_enable_trigger_print, |
6654 | .init = event_trigger_init, | |
6655 | .free = event_enable_trigger_free, | |
6656 | }; | |
6657 | ||
6658 | static struct event_trigger_ops hist_enable_count_trigger_ops = { | |
fb339e53 | 6659 | .trigger = hist_enable_count_trigger, |
d0bad49b TZ |
6660 | .print = event_enable_trigger_print, |
6661 | .init = event_trigger_init, | |
6662 | .free = event_enable_trigger_free, | |
6663 | }; | |
6664 | ||
6665 | static struct event_trigger_ops hist_disable_trigger_ops = { | |
fb339e53 | 6666 | .trigger = hist_enable_trigger, |
d0bad49b TZ |
6667 | .print = event_enable_trigger_print, |
6668 | .init = event_trigger_init, | |
6669 | .free = event_enable_trigger_free, | |
6670 | }; | |
6671 | ||
6672 | static struct event_trigger_ops hist_disable_count_trigger_ops = { | |
fb339e53 | 6673 | .trigger = hist_enable_count_trigger, |
d0bad49b TZ |
6674 | .print = event_enable_trigger_print, |
6675 | .init = event_trigger_init, | |
6676 | .free = event_enable_trigger_free, | |
6677 | }; | |
6678 | ||
6679 | static struct event_trigger_ops * | |
6680 | hist_enable_get_trigger_ops(char *cmd, char *param) | |
6681 | { | |
6682 | struct event_trigger_ops *ops; | |
6683 | bool enable; | |
6684 | ||
6685 | enable = (strcmp(cmd, ENABLE_HIST_STR) == 0); | |
6686 | ||
6687 | if (enable) | |
6688 | ops = param ? &hist_enable_count_trigger_ops : | |
6689 | &hist_enable_trigger_ops; | |
6690 | else | |
6691 | ops = param ? &hist_disable_count_trigger_ops : | |
6692 | &hist_disable_trigger_ops; | |
6693 | ||
6694 | return ops; | |
6695 | } | |
6696 | ||
52a7f16d TZ |
6697 | static void hist_enable_unreg_all(struct trace_event_file *file) |
6698 | { | |
47c18569 | 6699 | struct event_trigger_data *test, *n; |
52a7f16d | 6700 | |
47c18569 | 6701 | list_for_each_entry_safe(test, n, &file->triggers, list) { |
52a7f16d TZ |
6702 | if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) { |
6703 | list_del_rcu(&test->list); | |
6704 | update_cond_flag(file); | |
6705 | trace_event_trigger_enable_disable(file, 0); | |
6706 | if (test->ops->free) | |
47670541 | 6707 | test->ops->free(test); |
52a7f16d TZ |
6708 | } |
6709 | } | |
6710 | } | |
6711 | ||
d0bad49b TZ |
6712 | static struct event_command trigger_hist_enable_cmd = { |
6713 | .name = ENABLE_HIST_STR, | |
6714 | .trigger_type = ETT_HIST_ENABLE, | |
9ec5a7d1 | 6715 | .parse = event_enable_trigger_parse, |
d0bad49b TZ |
6716 | .reg = event_enable_register_trigger, |
6717 | .unreg = event_enable_unregister_trigger, | |
52a7f16d | 6718 | .unreg_all = hist_enable_unreg_all, |
d0bad49b TZ |
6719 | .get_trigger_ops = hist_enable_get_trigger_ops, |
6720 | .set_filter = set_trigger_filter, | |
6721 | }; | |
6722 | ||
6723 | static struct event_command trigger_hist_disable_cmd = { | |
6724 | .name = DISABLE_HIST_STR, | |
6725 | .trigger_type = ETT_HIST_ENABLE, | |
9ec5a7d1 | 6726 | .parse = event_enable_trigger_parse, |
d0bad49b TZ |
6727 | .reg = event_enable_register_trigger, |
6728 | .unreg = event_enable_unregister_trigger, | |
52a7f16d | 6729 | .unreg_all = hist_enable_unreg_all, |
d0bad49b TZ |
6730 | .get_trigger_ops = hist_enable_get_trigger_ops, |
6731 | .set_filter = set_trigger_filter, | |
6732 | }; | |
6733 | ||
6734 | static __init void unregister_trigger_hist_enable_disable_cmds(void) | |
6735 | { | |
6736 | unregister_event_command(&trigger_hist_enable_cmd); | |
6737 | unregister_event_command(&trigger_hist_disable_cmd); | |
6738 | } | |
6739 | ||
6740 | __init int register_trigger_hist_enable_disable_cmds(void) | |
6741 | { | |
6742 | int ret; | |
6743 | ||
6744 | ret = register_event_command(&trigger_hist_enable_cmd); | |
6745 | if (WARN_ON(ret < 0)) | |
6746 | return ret; | |
6747 | ret = register_event_command(&trigger_hist_disable_cmd); | |
6748 | if (WARN_ON(ret < 0)) | |
6749 | unregister_trigger_hist_enable_disable_cmds(); | |
6750 | ||
6751 | return ret; | |
6752 | } |