| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Tom Zanussi | 26466 | 83.10% | 108 | 48.00% |
| Steven Rostedt | 2237 | 7.02% | 52 | 23.11% |
| Kalesh Singh | 1427 | 4.48% | 9 | 4.00% |
| Masami Hiramatsu | 1166 | 3.66% | 13 | 5.78% |
| Namhyung Kim | 216 | 0.68% | 2 | 0.89% |
| Zheng Yejian | 90 | 0.28% | 6 | 2.67% |
| Vamshi K Sthambamkadi | 45 | 0.14% | 1 | 0.44% |
| Arnd Bergmann | 25 | 0.08% | 1 | 0.44% |
| Jakob Koschel | 19 | 0.06% | 1 | 0.44% |
| Keita Suzuki | 18 | 0.06% | 1 | 0.44% |
| Jason Baron | 14 | 0.04% | 1 | 0.44% |
| Natalia Petrova | 13 | 0.04% | 1 | 0.44% |
| Mohamed Khalfella | 12 | 0.04% | 2 | 0.89% |
| Ammar Faizi | 10 | 0.03% | 2 | 0.89% |
| Rusty Russell | 10 | 0.03% | 1 | 0.44% |
| Zhengjun Xing | 7 | 0.02% | 1 | 0.44% |
| HyeonggonYoo | 7 | 0.02% | 1 | 0.44% |
| Thomas Gleixner | 7 | 0.02% | 2 | 0.89% |
| Luis Claudio R. Goncalves | 6 | 0.02% | 1 | 0.44% |
| Frédéric Weisbecker | 6 | 0.02% | 1 | 0.44% |
| Alexei Starovoitov | 6 | 0.02% | 1 | 0.44% |
| Christophe Jaillet | 6 | 0.02% | 1 | 0.44% |
| Jiapeng Chong | 5 | 0.02% | 1 | 0.44% |
| Xiaoke Wang | 5 | 0.02% | 1 | 0.44% |
| Al Viro | 3 | 0.01% | 1 | 0.44% |
| Matthew Garrett | 3 | 0.01% | 1 | 0.44% |
| Colin Ian King | 3 | 0.01% | 2 | 0.89% |
| Ingo Molnar | 3 | 0.01% | 1 | 0.44% |
| Dan Carpenter | 3 | 0.01% | 2 | 0.89% |
| Hiraku Toyooka | 3 | 0.01% | 1 | 0.44% |
| Linus Torvalds (pre-git) | 2 | 0.01% | 1 | 0.44% |
| Srikar Dronamraju | 2 | 0.01% | 1 | 0.44% |
| Oleg Nesterov | 2 | 0.01% | 1 | 0.44% |
| Linus Torvalds | 1 | 0.00% | 1 | 0.44% |
| liqiong | 1 | 0.00% | 1 | 0.44% |
| Qiujun Huang | 1 | 0.00% | 1 | 0.44% |
| Total | 31850 | 225 |
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// SPDX-License-Identifier: GPL-2.0 /* * trace_events_hist - trace event hist triggers * * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com> */ #include <linux/module.h> #include <linux/kallsyms.h> #include <linux/security.h> #include <linux/mutex.h> #include <linux/slab.h> #include <linux/stacktrace.h> #include <linux/rculist.h> #include <linux/tracefs.h> /* for gfp flag names */ #include <linux/trace_events.h> #include <trace/events/mmflags.h> #include "tracing_map.h" #include "trace_synth.h" #define ERRORS \ C(NONE, "No error"), \ C(DUPLICATE_VAR, "Variable already defined"), \ C(VAR_NOT_UNIQUE, "Variable name not unique, need to use fully qualified name (subsys.event.var) for variable"), \ C(TOO_MANY_VARS, "Too many variables defined"), \ C(MALFORMED_ASSIGNMENT, "Malformed assignment"), \ C(NAMED_MISMATCH, "Named hist trigger doesn't match existing named trigger (includes variables)"), \ C(TRIGGER_EEXIST, "Hist trigger already exists"), \ C(TRIGGER_ENOENT_CLEAR, "Can't clear or continue a nonexistent hist trigger"), \ C(SET_CLOCK_FAIL, "Couldn't set trace_clock"), \ C(BAD_FIELD_MODIFIER, "Invalid field modifier"), \ C(TOO_MANY_SUBEXPR, "Too many subexpressions (3 max)"), \ C(TIMESTAMP_MISMATCH, "Timestamp units in expression don't match"), \ C(TOO_MANY_FIELD_VARS, "Too many field variables defined"), \ C(EVENT_FILE_NOT_FOUND, "Event file not found"), \ C(HIST_NOT_FOUND, "Matching event histogram not found"), \ C(HIST_CREATE_FAIL, "Couldn't create histogram for field"), \ C(SYNTH_VAR_NOT_FOUND, "Couldn't find synthetic variable"), \ C(SYNTH_EVENT_NOT_FOUND,"Couldn't find synthetic event"), \ C(SYNTH_TYPE_MISMATCH, "Param type doesn't match synthetic event field type"), \ C(SYNTH_COUNT_MISMATCH, "Param count doesn't match synthetic event field count"), \ C(FIELD_VAR_PARSE_FAIL, "Couldn't parse field variable"), \ C(VAR_CREATE_FIND_FAIL, "Couldn't create or find variable"), \ C(ONX_NOT_VAR, "For onmax(x) or onchange(x), x must be a variable"), \ C(ONX_VAR_NOT_FOUND, "Couldn't find onmax or onchange variable"), \ C(ONX_VAR_CREATE_FAIL, "Couldn't create onmax or onchange variable"), \ C(FIELD_VAR_CREATE_FAIL,"Couldn't create field variable"), \ C(TOO_MANY_PARAMS, "Too many action params"), \ C(PARAM_NOT_FOUND, "Couldn't find param"), \ C(INVALID_PARAM, "Invalid action param"), \ C(ACTION_NOT_FOUND, "No action found"), \ C(NO_SAVE_PARAMS, "No params found for save()"), \ C(TOO_MANY_SAVE_ACTIONS,"Can't have more than one save() action per hist"), \ C(ACTION_MISMATCH, "Handler doesn't support action"), \ C(NO_CLOSING_PAREN, "No closing paren found"), \ C(SUBSYS_NOT_FOUND, "Missing subsystem"), \ C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \ C(INVALID_REF_KEY, "Using variable references in keys not supported"), \ C(VAR_NOT_FOUND, "Couldn't find variable"), \ C(FIELD_NOT_FOUND, "Couldn't find field"), \ C(EMPTY_ASSIGNMENT, "Empty assignment"), \ C(INVALID_SORT_MODIFIER,"Invalid sort modifier"), \ C(EMPTY_SORT_FIELD, "Empty sort field"), \ C(TOO_MANY_SORT_FIELDS, "Too many sort fields (Max = 2)"), \ C(INVALID_SORT_FIELD, "Sort field must be a key or a val"), \ C(INVALID_STR_OPERAND, "String type can not be an operand in expression"), \ C(EXPECT_NUMBER, "Expecting numeric literal"), \ C(UNARY_MINUS_SUBEXPR, "Unary minus not supported in sub-expressions"), \ C(DIVISION_BY_ZERO, "Division by zero"), \ C(NEED_NOHC_VAL, "Non-hitcount value is required for 'nohitcount'"), #undef C #define C(a, b) HIST_ERR_##a enum { ERRORS }; #undef C #define C(a, b) b static const char *err_text[] = { ERRORS }; struct hist_field; typedef u64 (*hist_field_fn_t) (struct hist_field *field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event); #define HIST_FIELD_OPERANDS_MAX 2 #define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX) #define HIST_ACTIONS_MAX 8 #define HIST_CONST_DIGITS_MAX 21 #define HIST_DIV_SHIFT 20 /* For optimizing division by constants */ enum field_op_id { FIELD_OP_NONE, FIELD_OP_PLUS, FIELD_OP_MINUS, FIELD_OP_UNARY_MINUS, FIELD_OP_DIV, FIELD_OP_MULT, }; enum hist_field_fn { HIST_FIELD_FN_NOP, HIST_FIELD_FN_VAR_REF, HIST_FIELD_FN_COUNTER, HIST_FIELD_FN_CONST, HIST_FIELD_FN_LOG2, HIST_FIELD_FN_BUCKET, HIST_FIELD_FN_TIMESTAMP, HIST_FIELD_FN_CPU, HIST_FIELD_FN_STRING, HIST_FIELD_FN_DYNSTRING, HIST_FIELD_FN_RELDYNSTRING, HIST_FIELD_FN_PSTRING, HIST_FIELD_FN_S64, HIST_FIELD_FN_U64, HIST_FIELD_FN_S32, HIST_FIELD_FN_U32, HIST_FIELD_FN_S16, HIST_FIELD_FN_U16, HIST_FIELD_FN_S8, HIST_FIELD_FN_U8, HIST_FIELD_FN_UMINUS, HIST_FIELD_FN_MINUS, HIST_FIELD_FN_PLUS, HIST_FIELD_FN_DIV, HIST_FIELD_FN_MULT, HIST_FIELD_FN_DIV_POWER2, HIST_FIELD_FN_DIV_NOT_POWER2, HIST_FIELD_FN_DIV_MULT_SHIFT, HIST_FIELD_FN_EXECNAME, HIST_FIELD_FN_STACK, }; /* * A hist_var (histogram variable) contains variable information for * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF * flag set. A hist_var has a variable name e.g. ts0, and is * associated with a given histogram trigger, as specified by * hist_data. The hist_var idx is the unique index assigned to the * variable by the hist trigger's tracing_map. The idx is what is * used to set a variable's value and, by a variable reference, to * retrieve it. */ struct hist_var { char *name; struct hist_trigger_data *hist_data; unsigned int idx; }; struct hist_field { struct ftrace_event_field *field; unsigned long flags; unsigned long buckets; const char *type; struct hist_field *operands[HIST_FIELD_OPERANDS_MAX]; struct hist_trigger_data *hist_data; enum hist_field_fn fn_num; unsigned int ref; unsigned int size; unsigned int offset; unsigned int is_signed; /* * Variable fields contain variable-specific info in var. */ struct hist_var var; enum field_op_id operator; char *system; char *event_name; /* * The name field is used for EXPR and VAR_REF fields. VAR * fields contain the variable name in var.name. */ char *name; /* * When a histogram trigger is hit, if it has any references * to variables, the values of those variables are collected * into a var_ref_vals array by resolve_var_refs(). The * current value of each variable is read from the tracing_map * using the hist field's hist_var.idx and entered into the * var_ref_idx entry i.e. var_ref_vals[var_ref_idx]. */ unsigned int var_ref_idx; bool read_once; unsigned int var_str_idx; /* Numeric literals are represented as u64 */ u64 constant; /* Used to optimize division by constants */ u64 div_multiplier; }; static u64 hist_fn_call(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event); static u64 hist_field_const(struct hist_field *field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { return field->constant; } static u64 hist_field_counter(struct hist_field *field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { return 1; } static u64 hist_field_string(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { char *addr = (char *)(event + hist_field->field->offset); return (u64)(unsigned long)addr; } static u64 hist_field_dynstring(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { u32 str_item = *(u32 *)(event + hist_field->field->offset); int str_loc = str_item & 0xffff; char *addr = (char *)(event + str_loc); return (u64)(unsigned long)addr; } static u64 hist_field_reldynstring(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { u32 *item = event + hist_field->field->offset; u32 str_item = *item; int str_loc = str_item & 0xffff; char *addr = (char *)&item[1] + str_loc; return (u64)(unsigned long)addr; } static u64 hist_field_pstring(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { char **addr = (char **)(event + hist_field->field->offset); return (u64)(unsigned long)*addr; } static u64 hist_field_log2(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_field *operand = hist_field->operands[0]; u64 val = hist_fn_call(operand, elt, buffer, rbe, event); return (u64) ilog2(roundup_pow_of_two(val)); } static u64 hist_field_bucket(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_field *operand = hist_field->operands[0]; unsigned long buckets = hist_field->buckets; u64 val = hist_fn_call(operand, elt, buffer, rbe, event); if (WARN_ON_ONCE(!buckets)) return val; if (val >= LONG_MAX) val = div64_ul(val, buckets); else val = (u64)((unsigned long)val / buckets); return val * buckets; } static u64 hist_field_plus(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_field *operand1 = hist_field->operands[0]; struct hist_field *operand2 = hist_field->operands[1]; u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event); return val1 + val2; } static u64 hist_field_minus(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_field *operand1 = hist_field->operands[0]; struct hist_field *operand2 = hist_field->operands[1]; u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event); return val1 - val2; } static u64 hist_field_div(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_field *operand1 = hist_field->operands[0]; struct hist_field *operand2 = hist_field->operands[1]; u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event); /* Return -1 for the undefined case */ if (!val2) return -1; /* Use shift if the divisor is a power of 2 */ if (!(val2 & (val2 - 1))) return val1 >> __ffs64(val2); return div64_u64(val1, val2); } static u64 div_by_power_of_two(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_field *operand1 = hist_field->operands[0]; struct hist_field *operand2 = hist_field->operands[1]; u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); return val1 >> __ffs64(operand2->constant); } static u64 div_by_not_power_of_two(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_field *operand1 = hist_field->operands[0]; struct hist_field *operand2 = hist_field->operands[1]; u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); return div64_u64(val1, operand2->constant); } static u64 div_by_mult_and_shift(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_field *operand1 = hist_field->operands[0]; struct hist_field *operand2 = hist_field->operands[1]; u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); /* * If the divisor is a constant, do a multiplication and shift instead. * * Choose Z = some power of 2. If Y <= Z, then: * X / Y = (X * (Z / Y)) / Z * * (Z / Y) is a constant (mult) which is calculated at parse time, so: * X / Y = (X * mult) / Z * * The division by Z can be replaced by a shift since Z is a power of 2: * X / Y = (X * mult) >> HIST_DIV_SHIFT * * As long, as X < Z the results will not be off by more than 1. */ if (val1 < (1 << HIST_DIV_SHIFT)) { u64 mult = operand2->div_multiplier; return (val1 * mult + ((1 << HIST_DIV_SHIFT) - 1)) >> HIST_DIV_SHIFT; } return div64_u64(val1, operand2->constant); } static u64 hist_field_mult(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_field *operand1 = hist_field->operands[0]; struct hist_field *operand2 = hist_field->operands[1]; u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event); u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event); return val1 * val2; } static u64 hist_field_unary_minus(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_field *operand = hist_field->operands[0]; s64 sval = (s64)hist_fn_call(operand, elt, buffer, rbe, event); u64 val = (u64)-sval; return val; } #define DEFINE_HIST_FIELD_FN(type) \ static u64 hist_field_##type(struct hist_field *hist_field, \ struct tracing_map_elt *elt, \ struct trace_buffer *buffer, \ struct ring_buffer_event *rbe, \ void *event) \ { \ type *addr = (type *)(event + hist_field->field->offset); \ \ return (u64)(unsigned long)*addr; \ } DEFINE_HIST_FIELD_FN(s64); DEFINE_HIST_FIELD_FN(u64); DEFINE_HIST_FIELD_FN(s32); DEFINE_HIST_FIELD_FN(u32); DEFINE_HIST_FIELD_FN(s16); DEFINE_HIST_FIELD_FN(u16); DEFINE_HIST_FIELD_FN(s8); DEFINE_HIST_FIELD_FN(u8); #define for_each_hist_field(i, hist_data) \ for ((i) = 0; (i) < (hist_data)->n_fields; (i)++) #define for_each_hist_val_field(i, hist_data) \ for ((i) = 0; (i) < (hist_data)->n_vals; (i)++) #define for_each_hist_key_field(i, hist_data) \ for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++) #define HITCOUNT_IDX 0 #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE) enum hist_field_flags { HIST_FIELD_FL_HITCOUNT = 1 << 0, HIST_FIELD_FL_KEY = 1 << 1, HIST_FIELD_FL_STRING = 1 << 2, HIST_FIELD_FL_HEX = 1 << 3, HIST_FIELD_FL_SYM = 1 << 4, HIST_FIELD_FL_SYM_OFFSET = 1 << 5, HIST_FIELD_FL_EXECNAME = 1 << 6, HIST_FIELD_FL_SYSCALL = 1 << 7, HIST_FIELD_FL_STACKTRACE = 1 << 8, HIST_FIELD_FL_LOG2 = 1 << 9, HIST_FIELD_FL_TIMESTAMP = 1 << 10, HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11, HIST_FIELD_FL_VAR = 1 << 12, HIST_FIELD_FL_EXPR = 1 << 13, HIST_FIELD_FL_VAR_REF = 1 << 14, HIST_FIELD_FL_CPU = 1 << 15, HIST_FIELD_FL_ALIAS = 1 << 16, HIST_FIELD_FL_BUCKET = 1 << 17, HIST_FIELD_FL_CONST = 1 << 18, HIST_FIELD_FL_PERCENT = 1 << 19, HIST_FIELD_FL_GRAPH = 1 << 20, }; struct var_defs { unsigned int n_vars; char *name[TRACING_MAP_VARS_MAX]; char *expr[TRACING_MAP_VARS_MAX]; }; struct hist_trigger_attrs { char *keys_str; char *vals_str; char *sort_key_str; char *name; char *clock; bool pause; bool cont; bool clear; bool ts_in_usecs; bool no_hitcount; unsigned int map_bits; char *assignment_str[TRACING_MAP_VARS_MAX]; unsigned int n_assignments; char *action_str[HIST_ACTIONS_MAX]; unsigned int n_actions; struct var_defs var_defs; }; struct field_var { struct hist_field *var; struct hist_field *val; }; struct field_var_hist { struct hist_trigger_data *hist_data; char *cmd; }; struct hist_trigger_data { struct hist_field *fields[HIST_FIELDS_MAX]; unsigned int n_vals; unsigned int n_keys; unsigned int n_fields; unsigned int n_vars; unsigned int n_var_str; unsigned int key_size; struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX]; unsigned int n_sort_keys; struct trace_event_file *event_file; struct hist_trigger_attrs *attrs; struct tracing_map *map; bool enable_timestamps; bool remove; struct hist_field *var_refs[TRACING_MAP_VARS_MAX]; unsigned int n_var_refs; struct action_data *actions[HIST_ACTIONS_MAX]; unsigned int n_actions; struct field_var *field_vars[SYNTH_FIELDS_MAX]; unsigned int n_field_vars; unsigned int n_field_var_str; struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX]; unsigned int n_field_var_hists; struct field_var *save_vars[SYNTH_FIELDS_MAX]; unsigned int n_save_vars; unsigned int n_save_var_str; }; struct action_data; typedef void (*action_fn_t) (struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *rbe, void *key, struct action_data *data, u64 *var_ref_vals); typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val); enum handler_id { HANDLER_ONMATCH = 1, HANDLER_ONMAX, HANDLER_ONCHANGE, }; enum action_id { ACTION_SAVE = 1, ACTION_TRACE, ACTION_SNAPSHOT, }; struct action_data { enum handler_id handler; enum action_id action; char *action_name; action_fn_t fn; unsigned int n_params; char *params[SYNTH_FIELDS_MAX]; /* * When a histogram trigger is hit, the values of any * references to variables, including variables being passed * as parameters to synthetic events, are collected into a * var_ref_vals array. This var_ref_idx array is an array of * indices into the var_ref_vals array, one for each synthetic * event param, and is passed to the synthetic event * invocation. */ unsigned int var_ref_idx[SYNTH_FIELDS_MAX]; struct synth_event *synth_event; bool use_trace_keyword; char *synth_event_name; union { struct { char *event; char *event_system; } match_data; struct { /* * var_str contains the $-unstripped variable * name referenced by var_ref, and used when * printing the action. Because var_ref * creation is deferred to create_actions(), * we need a per-action way to save it until * then, thus var_str. */ char *var_str; /* * var_ref refers to the variable being * tracked e.g onmax($var). */ struct hist_field *var_ref; /* * track_var contains the 'invisible' tracking * variable created to keep the current * e.g. max value. */ struct hist_field *track_var; check_track_val_fn_t check_val; action_fn_t save_data; } track_data; }; }; struct track_data { u64 track_val; bool updated; unsigned int key_len; void *key; struct tracing_map_elt elt; struct action_data *action_data; struct hist_trigger_data *hist_data; }; struct hist_elt_data { char *comm; u64 *var_ref_vals; char **field_var_str; int n_field_var_str; }; struct snapshot_context { struct tracing_map_elt *elt; void *key; }; /* * Returns the specific division function to use if the divisor * is constant. This avoids extra branches when the trigger is hit. */ static enum hist_field_fn hist_field_get_div_fn(struct hist_field *divisor) { u64 div = divisor->constant; if (!(div & (div - 1))) return HIST_FIELD_FN_DIV_POWER2; /* If the divisor is too large, do a regular division */ if (div > (1 << HIST_DIV_SHIFT)) return HIST_FIELD_FN_DIV_NOT_POWER2; divisor->div_multiplier = div64_u64((u64)(1 << HIST_DIV_SHIFT), div); return HIST_FIELD_FN_DIV_MULT_SHIFT; } static void track_data_free(struct track_data *track_data) { struct hist_elt_data *elt_data; if (!track_data) return; kfree(track_data->key); elt_data = track_data->elt.private_data; if (elt_data) { kfree(elt_data->comm); kfree(elt_data); } kfree(track_data); } static struct track_data *track_data_alloc(unsigned int key_len, struct action_data *action_data, struct hist_trigger_data *hist_data) { struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL); struct hist_elt_data *elt_data; if (!data) return ERR_PTR(-ENOMEM); data->key = kzalloc(key_len, GFP_KERNEL); if (!data->key) { track_data_free(data); return ERR_PTR(-ENOMEM); } data->key_len = key_len; data->action_data = action_data; data->hist_data = hist_data; elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL); if (!elt_data) { track_data_free(data); return ERR_PTR(-ENOMEM); } data->elt.private_data = elt_data; elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL); if (!elt_data->comm) { track_data_free(data); return ERR_PTR(-ENOMEM); } return data; } #define HIST_PREFIX "hist:" static char *last_cmd; static char last_cmd_loc[MAX_FILTER_STR_VAL]; static int errpos(char *str) { if (!str || !last_cmd) return 0; return err_pos(last_cmd, str); } static void last_cmd_set(struct trace_event_file *file, char *str) { const char *system = NULL, *name = NULL; struct trace_event_call *call; if (!str) return; kfree(last_cmd); last_cmd = kasprintf(GFP_KERNEL, HIST_PREFIX "%s", str); if (!last_cmd) return; if (file) { call = file->event_call; system = call->class->system; if (system) { name = trace_event_name(call); if (!name) system = NULL; } } if (system) snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, HIST_PREFIX "%s:%s", system, name); } static void hist_err(struct trace_array *tr, u8 err_type, u16 err_pos) { if (!last_cmd) return; tracing_log_err(tr, last_cmd_loc, last_cmd, err_text, err_type, err_pos); } static void hist_err_clear(void) { if (last_cmd) last_cmd[0] = '\0'; last_cmd_loc[0] = '\0'; } typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals, unsigned int *var_ref_idx); static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals, unsigned int *var_ref_idx) { struct tracepoint *tp = event->tp; if (unlikely(atomic_read(&tp->key.enabled) > 0)) { struct tracepoint_func *probe_func_ptr; synth_probe_func_t probe_func; void *__data; if (!(cpu_online(raw_smp_processor_id()))) return; probe_func_ptr = rcu_dereference_sched((tp)->funcs); if (probe_func_ptr) { do { probe_func = probe_func_ptr->func; __data = probe_func_ptr->data; probe_func(__data, var_ref_vals, var_ref_idx); } while ((++probe_func_ptr)->func); } } } static void action_trace(struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *rbe, void *key, struct action_data *data, u64 *var_ref_vals) { struct synth_event *event = data->synth_event; trace_synth(event, var_ref_vals, data->var_ref_idx); } struct hist_var_data { struct list_head list; struct hist_trigger_data *hist_data; }; static u64 hist_field_timestamp(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_trigger_data *hist_data = hist_field->hist_data; struct trace_array *tr = hist_data->event_file->tr; u64 ts = ring_buffer_event_time_stamp(buffer, rbe); if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr)) ts = ns2usecs(ts); return ts; } static u64 hist_field_cpu(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { int cpu = smp_processor_id(); return cpu; } /** * check_field_for_var_ref - Check if a VAR_REF field references a variable * @hist_field: The VAR_REF field to check * @var_data: The hist trigger that owns the variable * @var_idx: The trigger variable identifier * * Check the given VAR_REF field to see whether or not it references * the given variable associated with the given trigger. * * Return: The VAR_REF field if it does reference the variable, NULL if not */ static struct hist_field * check_field_for_var_ref(struct hist_field *hist_field, struct hist_trigger_data *var_data, unsigned int var_idx) { WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF)); if (hist_field && hist_field->var.idx == var_idx && hist_field->var.hist_data == var_data) return hist_field; return NULL; } /** * find_var_ref - Check if a trigger has a reference to a trigger variable * @hist_data: The hist trigger that might have a reference to the variable * @var_data: The hist trigger that owns the variable * @var_idx: The trigger variable identifier * * Check the list of var_refs[] on the first hist trigger to see * whether any of them are references to the variable on the second * trigger. * * Return: The VAR_REF field referencing the variable if so, NULL if not */ static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data, struct hist_trigger_data *var_data, unsigned int var_idx) { struct hist_field *hist_field; unsigned int i; for (i = 0; i < hist_data->n_var_refs; i++) { hist_field = hist_data->var_refs[i]; if (check_field_for_var_ref(hist_field, var_data, var_idx)) return hist_field; } return NULL; } /** * find_any_var_ref - Check if there is a reference to a given trigger variable * @hist_data: The hist trigger * @var_idx: The trigger variable identifier * * Check to see whether the given variable is currently referenced by * any other trigger. * * The trigger the variable is defined on is explicitly excluded - the * assumption being that a self-reference doesn't prevent a trigger * from being removed. * * Return: The VAR_REF field referencing the variable if so, NULL if not */ static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data, unsigned int var_idx) { struct trace_array *tr = hist_data->event_file->tr; struct hist_field *found = NULL; struct hist_var_data *var_data; list_for_each_entry(var_data, &tr->hist_vars, list) { if (var_data->hist_data == hist_data) continue; found = find_var_ref(var_data->hist_data, hist_data, var_idx); if (found) break; } return found; } /** * check_var_refs - Check if there is a reference to any of trigger's variables * @hist_data: The hist trigger * * A trigger can define one or more variables. If any one of them is * currently referenced by any other trigger, this function will * determine that. * * Typically used to determine whether or not a trigger can be removed * - if there are any references to a trigger's variables, it cannot. * * Return: True if there is a reference to any of trigger's variables */ static bool check_var_refs(struct hist_trigger_data *hist_data) { struct hist_field *field; bool found = false; int i; for_each_hist_field(i, hist_data) { field = hist_data->fields[i]; if (field && field->flags & HIST_FIELD_FL_VAR) { if (find_any_var_ref(hist_data, field->var.idx)) { found = true; break; } } } return found; } static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data) { struct trace_array *tr = hist_data->event_file->tr; struct hist_var_data *var_data, *found = NULL; list_for_each_entry(var_data, &tr->hist_vars, list) { if (var_data->hist_data == hist_data) { found = var_data; break; } } return found; } static bool field_has_hist_vars(struct hist_field *hist_field, unsigned int level) { int i; if (level > 3) return false; if (!hist_field) return false; if (hist_field->flags & HIST_FIELD_FL_VAR || hist_field->flags & HIST_FIELD_FL_VAR_REF) return true; for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) { struct hist_field *operand; operand = hist_field->operands[i]; if (field_has_hist_vars(operand, level + 1)) return true; } return false; } static bool has_hist_vars(struct hist_trigger_data *hist_data) { struct hist_field *hist_field; int i; for_each_hist_field(i, hist_data) { hist_field = hist_data->fields[i]; if (field_has_hist_vars(hist_field, 0)) return true; } return false; } static int save_hist_vars(struct hist_trigger_data *hist_data) { struct trace_array *tr = hist_data->event_file->tr; struct hist_var_data *var_data; var_data = find_hist_vars(hist_data); if (var_data) return 0; if (tracing_check_open_get_tr(tr)) return -ENODEV; var_data = kzalloc(sizeof(*var_data), GFP_KERNEL); if (!var_data) { trace_array_put(tr); return -ENOMEM; } var_data->hist_data = hist_data; list_add(&var_data->list, &tr->hist_vars); return 0; } static void remove_hist_vars(struct hist_trigger_data *hist_data) { struct trace_array *tr = hist_data->event_file->tr; struct hist_var_data *var_data; var_data = find_hist_vars(hist_data); if (!var_data) return; if (WARN_ON(check_var_refs(hist_data))) return; list_del(&var_data->list); kfree(var_data); trace_array_put(tr); } static struct hist_field *find_var_field(struct hist_trigger_data *hist_data, const char *var_name) { struct hist_field *hist_field, *found = NULL; int i; for_each_hist_field(i, hist_data) { hist_field = hist_data->fields[i]; if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR && strcmp(hist_field->var.name, var_name) == 0) { found = hist_field; break; } } return found; } static struct hist_field *find_var(struct hist_trigger_data *hist_data, struct trace_event_file *file, const char *var_name) { struct hist_trigger_data *test_data; struct event_trigger_data *test; struct hist_field *hist_field; lockdep_assert_held(&event_mutex); hist_field = find_var_field(hist_data, var_name); if (hist_field) return hist_field; list_for_each_entry(test, &file->triggers, list) { if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { test_data = test->private_data; hist_field = find_var_field(test_data, var_name); if (hist_field) return hist_field; } } return NULL; } static struct trace_event_file *find_var_file(struct trace_array *tr, char *system, char *event_name, char *var_name) { struct hist_trigger_data *var_hist_data; struct hist_var_data *var_data; struct trace_event_file *file, *found = NULL; if (system) return find_event_file(tr, system, event_name); list_for_each_entry(var_data, &tr->hist_vars, list) { var_hist_data = var_data->hist_data; file = var_hist_data->event_file; if (file == found) continue; if (find_var_field(var_hist_data, var_name)) { if (found) { hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name)); return NULL; } found = file; } } return found; } static struct hist_field *find_file_var(struct trace_event_file *file, const char *var_name) { struct hist_trigger_data *test_data; struct event_trigger_data *test; struct hist_field *hist_field; lockdep_assert_held(&event_mutex); list_for_each_entry(test, &file->triggers, list) { if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { test_data = test->private_data; hist_field = find_var_field(test_data, var_name); if (hist_field) return hist_field; } } return NULL; } static struct hist_field * find_match_var(struct hist_trigger_data *hist_data, char *var_name) { struct trace_array *tr = hist_data->event_file->tr; struct hist_field *hist_field, *found = NULL; struct trace_event_file *file; unsigned int i; for (i = 0; i < hist_data->n_actions; i++) { struct action_data *data = hist_data->actions[i]; if (data->handler == HANDLER_ONMATCH) { char *system = data->match_data.event_system; char *event_name = data->match_data.event; file = find_var_file(tr, system, event_name, var_name); if (!file) continue; hist_field = find_file_var(file, var_name); if (hist_field) { if (found) { hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name)); return ERR_PTR(-EINVAL); } found = hist_field; } } } return found; } static struct hist_field *find_event_var(struct hist_trigger_data *hist_data, char *system, char *event_name, char *var_name) { struct trace_array *tr = hist_data->event_file->tr; struct hist_field *hist_field = NULL; struct trace_event_file *file; if (!system || !event_name) { hist_field = find_match_var(hist_data, var_name); if (IS_ERR(hist_field)) return NULL; if (hist_field) return hist_field; } file = find_var_file(tr, system, event_name, var_name); if (!file) return NULL; hist_field = find_file_var(file, var_name); return hist_field; } static u64 hist_field_var_ref(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_elt_data *elt_data; u64 var_val = 0; if (WARN_ON_ONCE(!elt)) return var_val; elt_data = elt->private_data; var_val = elt_data->var_ref_vals[hist_field->var_ref_idx]; return var_val; } static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key, u64 *var_ref_vals, bool self) { struct hist_trigger_data *var_data; struct tracing_map_elt *var_elt; struct hist_field *hist_field; unsigned int i, var_idx; bool resolved = true; u64 var_val = 0; for (i = 0; i < hist_data->n_var_refs; i++) { hist_field = hist_data->var_refs[i]; var_idx = hist_field->var.idx; var_data = hist_field->var.hist_data; if (var_data == NULL) { resolved = false; break; } if ((self && var_data != hist_data) || (!self && var_data == hist_data)) continue; var_elt = tracing_map_lookup(var_data->map, key); if (!var_elt) { resolved = false; break; } if (!tracing_map_var_set(var_elt, var_idx)) { resolved = false; break; } if (self || !hist_field->read_once) var_val = tracing_map_read_var(var_elt, var_idx); else var_val = tracing_map_read_var_once(var_elt, var_idx); var_ref_vals[i] = var_val; } return resolved; } static const char *hist_field_name(struct hist_field *field, unsigned int level) { const char *field_name = ""; if (WARN_ON_ONCE(!field)) return field_name; if (level > 1) return field_name; if (field->field) field_name = field->field->name; else if (field->flags & HIST_FIELD_FL_LOG2 || field->flags & HIST_FIELD_FL_ALIAS || field->flags & HIST_FIELD_FL_BUCKET) field_name = hist_field_name(field->operands[0], ++level); else if (field->flags & HIST_FIELD_FL_CPU) field_name = "common_cpu"; else if (field->flags & HIST_FIELD_FL_EXPR || field->flags & HIST_FIELD_FL_VAR_REF) { if (field->system) { static char full_name[MAX_FILTER_STR_VAL]; strcat(full_name, field->system); strcat(full_name, "."); strcat(full_name, field->event_name); strcat(full_name, "."); strcat(full_name, field->name); field_name = full_name; } else field_name = field->name; } else if (field->flags & HIST_FIELD_FL_TIMESTAMP) field_name = "common_timestamp"; else if (field->flags & HIST_FIELD_FL_STACKTRACE) { if (field->field) field_name = field->field->name; else field_name = "common_stacktrace"; } else if (field->flags & HIST_FIELD_FL_HITCOUNT) field_name = "hitcount"; if (field_name == NULL) field_name = ""; return field_name; } static enum hist_field_fn select_value_fn(int field_size, int field_is_signed) { switch (field_size) { case 8: if (field_is_signed) return HIST_FIELD_FN_S64; else return HIST_FIELD_FN_U64; case 4: if (field_is_signed) return HIST_FIELD_FN_S32; else return HIST_FIELD_FN_U32; case 2: if (field_is_signed) return HIST_FIELD_FN_S16; else return HIST_FIELD_FN_U16; case 1: if (field_is_signed) return HIST_FIELD_FN_S8; else return HIST_FIELD_FN_U8; } return HIST_FIELD_FN_NOP; } static int parse_map_size(char *str) { unsigned long size, map_bits; int ret; ret = kstrtoul(str, 0, &size); if (ret) goto out; map_bits = ilog2(roundup_pow_of_two(size)); if (map_bits < TRACING_MAP_BITS_MIN || map_bits > TRACING_MAP_BITS_MAX) ret = -EINVAL; else ret = map_bits; out: return ret; } static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs) { unsigned int i; if (!attrs) return; for (i = 0; i < attrs->n_assignments; i++) kfree(attrs->assignment_str[i]); for (i = 0; i < attrs->n_actions; i++) kfree(attrs->action_str[i]); kfree(attrs->name); kfree(attrs->sort_key_str); kfree(attrs->keys_str); kfree(attrs->vals_str); kfree(attrs->clock); kfree(attrs); } static int parse_action(char *str, struct hist_trigger_attrs *attrs) { int ret = -EINVAL; if (attrs->n_actions >= HIST_ACTIONS_MAX) return ret; if ((str_has_prefix(str, "onmatch(")) || (str_has_prefix(str, "onmax(")) || (str_has_prefix(str, "onchange("))) { attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL); if (!attrs->action_str[attrs->n_actions]) { ret = -ENOMEM; return ret; } attrs->n_actions++; ret = 0; } return ret; } static int parse_assignment(struct trace_array *tr, char *str, struct hist_trigger_attrs *attrs) { int len, ret = 0; if ((len = str_has_prefix(str, "key=")) || (len = str_has_prefix(str, "keys="))) { attrs->keys_str = kstrdup(str + len, GFP_KERNEL); if (!attrs->keys_str) { ret = -ENOMEM; goto out; } } else if ((len = str_has_prefix(str, "val=")) || (len = str_has_prefix(str, "vals=")) || (len = str_has_prefix(str, "values="))) { attrs->vals_str = kstrdup(str + len, GFP_KERNEL); if (!attrs->vals_str) { ret = -ENOMEM; goto out; } } else if ((len = str_has_prefix(str, "sort="))) { attrs->sort_key_str = kstrdup(str + len, GFP_KERNEL); if (!attrs->sort_key_str) { ret = -ENOMEM; goto out; } } else if (str_has_prefix(str, "name=")) { attrs->name = kstrdup(str, GFP_KERNEL); if (!attrs->name) { ret = -ENOMEM; goto out; } } else if ((len = str_has_prefix(str, "clock="))) { str += len; str = strstrip(str); attrs->clock = kstrdup(str, GFP_KERNEL); if (!attrs->clock) { ret = -ENOMEM; goto out; } } else if ((len = str_has_prefix(str, "size="))) { int map_bits = parse_map_size(str + len); if (map_bits < 0) { ret = map_bits; goto out; } attrs->map_bits = map_bits; } else { char *assignment; if (attrs->n_assignments == TRACING_MAP_VARS_MAX) { hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str)); ret = -EINVAL; goto out; } assignment = kstrdup(str, GFP_KERNEL); if (!assignment) { ret = -ENOMEM; goto out; } attrs->assignment_str[attrs->n_assignments++] = assignment; } out: return ret; } static struct hist_trigger_attrs * parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str) { struct hist_trigger_attrs *attrs; int ret = 0; attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); if (!attrs) return ERR_PTR(-ENOMEM); while (trigger_str) { char *str = strsep(&trigger_str, ":"); char *rhs; rhs = strchr(str, '='); if (rhs) { if (!strlen(++rhs)) { ret = -EINVAL; hist_err(tr, HIST_ERR_EMPTY_ASSIGNMENT, errpos(str)); goto free; } ret = parse_assignment(tr, str, attrs); if (ret) goto free; } else if (strcmp(str, "nohitcount") == 0 || strcmp(str, "NOHC") == 0) attrs->no_hitcount = true; else if (strcmp(str, "pause") == 0) attrs->pause = true; else if ((strcmp(str, "cont") == 0) || (strcmp(str, "continue") == 0)) attrs->cont = true; else if (strcmp(str, "clear") == 0) attrs->clear = true; else { ret = parse_action(str, attrs); if (ret) goto free; } } if (!attrs->keys_str) { ret = -EINVAL; goto free; } if (!attrs->clock) { attrs->clock = kstrdup("global", GFP_KERNEL); if (!attrs->clock) { ret = -ENOMEM; goto free; } } return attrs; free: destroy_hist_trigger_attrs(attrs); return ERR_PTR(ret); } static inline void save_comm(char *comm, struct task_struct *task) { if (!task->pid) { strcpy(comm, "<idle>"); return; } if (WARN_ON_ONCE(task->pid < 0)) { strcpy(comm, "<XXX>"); return; } strncpy(comm, task->comm, TASK_COMM_LEN); } static void hist_elt_data_free(struct hist_elt_data *elt_data) { unsigned int i; for (i = 0; i < elt_data->n_field_var_str; i++) kfree(elt_data->field_var_str[i]); kfree(elt_data->field_var_str); kfree(elt_data->comm); kfree(elt_data); } static void hist_trigger_elt_data_free(struct tracing_map_elt *elt) { struct hist_elt_data *elt_data = elt->private_data; hist_elt_data_free(elt_data); } static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt) { struct hist_trigger_data *hist_data = elt->map->private_data; unsigned int size = TASK_COMM_LEN; struct hist_elt_data *elt_data; struct hist_field *hist_field; unsigned int i, n_str; elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL); if (!elt_data) return -ENOMEM; for_each_hist_field(i, hist_data) { hist_field = hist_data->fields[i]; if (hist_field->flags & HIST_FIELD_FL_EXECNAME) { elt_data->comm = kzalloc(size, GFP_KERNEL); if (!elt_data->comm) { kfree(elt_data); return -ENOMEM; } break; } } n_str = hist_data->n_field_var_str + hist_data->n_save_var_str + hist_data->n_var_str; if (n_str > SYNTH_FIELDS_MAX) { hist_elt_data_free(elt_data); return -EINVAL; } BUILD_BUG_ON(STR_VAR_LEN_MAX & (sizeof(u64) - 1)); size = STR_VAR_LEN_MAX; elt_data->field_var_str = kcalloc(n_str, sizeof(char *), GFP_KERNEL); if (!elt_data->field_var_str) { hist_elt_data_free(elt_data); return -EINVAL; } elt_data->n_field_var_str = n_str; for (i = 0; i < n_str; i++) { elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL); if (!elt_data->field_var_str[i]) { hist_elt_data_free(elt_data); return -ENOMEM; } } elt->private_data = elt_data; return 0; } static void hist_trigger_elt_data_init(struct tracing_map_elt *elt) { struct hist_elt_data *elt_data = elt->private_data; if (elt_data->comm) save_comm(elt_data->comm, current); } static const struct tracing_map_ops hist_trigger_elt_data_ops = { .elt_alloc = hist_trigger_elt_data_alloc, .elt_free = hist_trigger_elt_data_free, .elt_init = hist_trigger_elt_data_init, }; static const char *get_hist_field_flags(struct hist_field *hist_field) { const char *flags_str = NULL; if (hist_field->flags & HIST_FIELD_FL_HEX) flags_str = "hex"; else if (hist_field->flags & HIST_FIELD_FL_SYM) flags_str = "sym"; else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET) flags_str = "sym-offset"; else if (hist_field->flags & HIST_FIELD_FL_EXECNAME) flags_str = "execname"; else if (hist_field->flags & HIST_FIELD_FL_SYSCALL) flags_str = "syscall"; else if (hist_field->flags & HIST_FIELD_FL_LOG2) flags_str = "log2"; else if (hist_field->flags & HIST_FIELD_FL_BUCKET) flags_str = "buckets"; else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS) flags_str = "usecs"; else if (hist_field->flags & HIST_FIELD_FL_PERCENT) flags_str = "percent"; else if (hist_field->flags & HIST_FIELD_FL_GRAPH) flags_str = "graph"; else if (hist_field->flags & HIST_FIELD_FL_STACKTRACE) flags_str = "stacktrace"; return flags_str; } static void expr_field_str(struct hist_field *field, char *expr) { if (field->flags & HIST_FIELD_FL_VAR_REF) strcat(expr, "$"); else if (field->flags & HIST_FIELD_FL_CONST) { char str[HIST_CONST_DIGITS_MAX]; snprintf(str, HIST_CONST_DIGITS_MAX, "%llu", field->constant); strcat(expr, str); } strcat(expr, hist_field_name(field, 0)); if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) { const char *flags_str = get_hist_field_flags(field); if (flags_str) { strcat(expr, "."); strcat(expr, flags_str); } } } static char *expr_str(struct hist_field *field, unsigned int level) { char *expr; if (level > 1) return NULL; expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); if (!expr) return NULL; if (!field->operands[0]) { expr_field_str(field, expr); return expr; } if (field->operator == FIELD_OP_UNARY_MINUS) { char *subexpr; strcat(expr, "-("); subexpr = expr_str(field->operands[0], ++level); if (!subexpr) { kfree(expr); return NULL; } strcat(expr, subexpr); strcat(expr, ")"); kfree(subexpr); return expr; } expr_field_str(field->operands[0], expr); switch (field->operator) { case FIELD_OP_MINUS: strcat(expr, "-"); break; case FIELD_OP_PLUS: strcat(expr, "+"); break; case FIELD_OP_DIV: strcat(expr, "/"); break; case FIELD_OP_MULT: strcat(expr, "*"); break; default: kfree(expr); return NULL; } expr_field_str(field->operands[1], expr); return expr; } /* * If field_op != FIELD_OP_NONE, *sep points to the root operator * of the expression tree to be evaluated. */ static int contains_operator(char *str, char **sep) { enum field_op_id field_op = FIELD_OP_NONE; char *minus_op, *plus_op, *div_op, *mult_op; /* * Report the last occurrence of the operators first, so that the * expression is evaluated left to right. This is important since * subtraction and division are not associative. * * e.g * 64/8/4/2 is 1, i.e 64/8/4/2 = ((64/8)/4)/2 * 14-7-5-2 is 0, i.e 14-7-5-2 = ((14-7)-5)-2 */ /* * First, find lower precedence addition and subtraction * since the expression will be evaluated recursively. */ minus_op = strrchr(str, '-'); if (minus_op) { /* * Unary minus is not supported in sub-expressions. If * present, it is always the next root operator. */ if (minus_op == str) { field_op = FIELD_OP_UNARY_MINUS; goto out; } field_op = FIELD_OP_MINUS; } plus_op = strrchr(str, '+'); if (plus_op || minus_op) { /* * For operators of the same precedence use to rightmost as the * root, so that the expression is evaluated left to right. */ if (plus_op > minus_op) field_op = FIELD_OP_PLUS; goto out; } /* * Multiplication and division have higher precedence than addition and * subtraction. */ div_op = strrchr(str, '/'); if (div_op) field_op = FIELD_OP_DIV; mult_op = strrchr(str, '*'); /* * For operators of the same precedence use to rightmost as the * root, so that the expression is evaluated left to right. */ if (mult_op > div_op) field_op = FIELD_OP_MULT; out: if (sep) { switch (field_op) { case FIELD_OP_UNARY_MINUS: case FIELD_OP_MINUS: *sep = minus_op; break; case FIELD_OP_PLUS: *sep = plus_op; break; case FIELD_OP_DIV: *sep = div_op; break; case FIELD_OP_MULT: *sep = mult_op; break; case FIELD_OP_NONE: default: *sep = NULL; break; } } return field_op; } static void get_hist_field(struct hist_field *hist_field) { hist_field->ref++; } static void __destroy_hist_field(struct hist_field *hist_field) { if (--hist_field->ref > 1) return; kfree(hist_field->var.name); kfree(hist_field->name); /* Can likely be a const */ kfree_const(hist_field->type); kfree(hist_field->system); kfree(hist_field->event_name); kfree(hist_field); } static void destroy_hist_field(struct hist_field *hist_field, unsigned int level) { unsigned int i; if (level > 3) return; if (!hist_field) return; if (hist_field->flags & HIST_FIELD_FL_VAR_REF) return; /* var refs will be destroyed separately */ for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) destroy_hist_field(hist_field->operands[i], level + 1); __destroy_hist_field(hist_field); } static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data, struct ftrace_event_field *field, unsigned long flags, char *var_name) { struct hist_field *hist_field; if (field && is_function_field(field)) return NULL; hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL); if (!hist_field) return NULL; hist_field->ref = 1; hist_field->hist_data = hist_data; if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS) goto out; /* caller will populate */ if (flags & HIST_FIELD_FL_VAR_REF) { hist_field->fn_num = HIST_FIELD_FN_VAR_REF; goto out; } if (flags & HIST_FIELD_FL_HITCOUNT) { hist_field->fn_num = HIST_FIELD_FN_COUNTER; hist_field->size = sizeof(u64); hist_field->type = "u64"; goto out; } if (flags & HIST_FIELD_FL_CONST) { hist_field->fn_num = HIST_FIELD_FN_CONST; hist_field->size = sizeof(u64); hist_field->type = kstrdup("u64", GFP_KERNEL); if (!hist_field->type) goto free; goto out; } if (flags & HIST_FIELD_FL_STACKTRACE) { if (field) hist_field->fn_num = HIST_FIELD_FN_STACK; else hist_field->fn_num = HIST_FIELD_FN_NOP; hist_field->size = HIST_STACKTRACE_SIZE; hist_field->type = kstrdup_const("unsigned long[]", GFP_KERNEL); if (!hist_field->type) goto free; goto out; } if (flags & (HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET)) { unsigned long fl = flags & ~(HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET); hist_field->fn_num = flags & HIST_FIELD_FL_LOG2 ? HIST_FIELD_FN_LOG2 : HIST_FIELD_FN_BUCKET; hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL); if (!hist_field->operands[0]) goto free; hist_field->size = hist_field->operands[0]->size; hist_field->type = kstrdup_const(hist_field->operands[0]->type, GFP_KERNEL); if (!hist_field->type) goto free; goto out; } if (flags & HIST_FIELD_FL_TIMESTAMP) { hist_field->fn_num = HIST_FIELD_FN_TIMESTAMP; hist_field->size = sizeof(u64); hist_field->type = "u64"; goto out; } if (flags & HIST_FIELD_FL_CPU) { hist_field->fn_num = HIST_FIELD_FN_CPU; hist_field->size = sizeof(int); hist_field->type = "unsigned int"; goto out; } if (WARN_ON_ONCE(!field)) goto out; /* Pointers to strings are just pointers and dangerous to dereference */ if (is_string_field(field) && (field->filter_type != FILTER_PTR_STRING)) { flags |= HIST_FIELD_FL_STRING; hist_field->size = MAX_FILTER_STR_VAL; hist_field->type = kstrdup_const(field->type, GFP_KERNEL); if (!hist_field->type) goto free; if (field->filter_type == FILTER_STATIC_STRING) { hist_field->fn_num = HIST_FIELD_FN_STRING; hist_field->size = field->size; } else if (field->filter_type == FILTER_DYN_STRING) { hist_field->fn_num = HIST_FIELD_FN_DYNSTRING; } else if (field->filter_type == FILTER_RDYN_STRING) hist_field->fn_num = HIST_FIELD_FN_RELDYNSTRING; else hist_field->fn_num = HIST_FIELD_FN_PSTRING; } else { hist_field->size = field->size; hist_field->is_signed = field->is_signed; hist_field->type = kstrdup_const(field->type, GFP_KERNEL); if (!hist_field->type) goto free; hist_field->fn_num = select_value_fn(field->size, field->is_signed); if (hist_field->fn_num == HIST_FIELD_FN_NOP) { destroy_hist_field(hist_field, 0); return NULL; } } out: hist_field->field = field; hist_field->flags = flags; if (var_name) { hist_field->var.name = kstrdup(var_name, GFP_KERNEL); if (!hist_field->var.name) goto free; } return hist_field; free: destroy_hist_field(hist_field, 0); return NULL; } static void destroy_hist_fields(struct hist_trigger_data *hist_data) { unsigned int i; for (i = 0; i < HIST_FIELDS_MAX; i++) { if (hist_data->fields[i]) { destroy_hist_field(hist_data->fields[i], 0); hist_data->fields[i] = NULL; } } for (i = 0; i < hist_data->n_var_refs; i++) { WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF)); __destroy_hist_field(hist_data->var_refs[i]); hist_data->var_refs[i] = NULL; } } static int init_var_ref(struct hist_field *ref_field, struct hist_field *var_field, char *system, char *event_name) { int err = 0; ref_field->var.idx = var_field->var.idx; ref_field->var.hist_data = var_field->hist_data; ref_field->size = var_field->size; ref_field->is_signed = var_field->is_signed; ref_field->flags |= var_field->flags & (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); if (system) { ref_field->system = kstrdup(system, GFP_KERNEL); if (!ref_field->system) return -ENOMEM; } if (event_name) { ref_field->event_name = kstrdup(event_name, GFP_KERNEL); if (!ref_field->event_name) { err = -ENOMEM; goto free; } } if (var_field->var.name) { ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL); if (!ref_field->name) { err = -ENOMEM; goto free; } } else if (var_field->name) { ref_field->name = kstrdup(var_field->name, GFP_KERNEL); if (!ref_field->name) { err = -ENOMEM; goto free; } } ref_field->type = kstrdup_const(var_field->type, GFP_KERNEL); if (!ref_field->type) { err = -ENOMEM; goto free; } out: return err; free: kfree(ref_field->system); ref_field->system = NULL; kfree(ref_field->event_name); ref_field->event_name = NULL; kfree(ref_field->name); ref_field->name = NULL; goto out; } static int find_var_ref_idx(struct hist_trigger_data *hist_data, struct hist_field *var_field) { struct hist_field *ref_field; int i; for (i = 0; i < hist_data->n_var_refs; i++) { ref_field = hist_data->var_refs[i]; if (ref_field->var.idx == var_field->var.idx && ref_field->var.hist_data == var_field->hist_data) return i; } return -ENOENT; } /** * create_var_ref - Create a variable reference and attach it to trigger * @hist_data: The trigger that will be referencing the variable * @var_field: The VAR field to create a reference to * @system: The optional system string * @event_name: The optional event_name string * * Given a variable hist_field, create a VAR_REF hist_field that * represents a reference to it. * * This function also adds the reference to the trigger that * now references the variable. * * Return: The VAR_REF field if successful, NULL if not */ static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data, struct hist_field *var_field, char *system, char *event_name) { unsigned long flags = HIST_FIELD_FL_VAR_REF; struct hist_field *ref_field; int i; /* Check if the variable already exists */ for (i = 0; i < hist_data->n_var_refs; i++) { ref_field = hist_data->var_refs[i]; if (ref_field->var.idx == var_field->var.idx && ref_field->var.hist_data == var_field->hist_data) { get_hist_field(ref_field); return ref_field; } } /* Sanity check to avoid out-of-bound write on 'hist_data->var_refs' */ if (hist_data->n_var_refs >= TRACING_MAP_VARS_MAX) return NULL; ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL); if (ref_field) { if (init_var_ref(ref_field, var_field, system, event_name)) { destroy_hist_field(ref_field, 0); return NULL; } hist_data->var_refs[hist_data->n_var_refs] = ref_field; ref_field->var_ref_idx = hist_data->n_var_refs++; } return ref_field; } static bool is_var_ref(char *var_name) { if (!var_name || strlen(var_name) < 2 || var_name[0] != '$') return false; return true; } static char *field_name_from_var(struct hist_trigger_data *hist_data, char *var_name) { char *name, *field; unsigned int i; for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { name = hist_data->attrs->var_defs.name[i]; if (strcmp(var_name, name) == 0) { field = hist_data->attrs->var_defs.expr[i]; if (contains_operator(field, NULL) || is_var_ref(field)) continue; return field; } } return NULL; } static char *local_field_var_ref(struct hist_trigger_data *hist_data, char *system, char *event_name, char *var_name) { struct trace_event_call *call; if (system && event_name) { call = hist_data->event_file->event_call; if (strcmp(system, call->class->system) != 0) return NULL; if (strcmp(event_name, trace_event_name(call)) != 0) return NULL; } if (!!system != !!event_name) return NULL; if (!is_var_ref(var_name)) return NULL; var_name++; return field_name_from_var(hist_data, var_name); } static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data, char *system, char *event_name, char *var_name) { struct hist_field *var_field = NULL, *ref_field = NULL; struct trace_array *tr = hist_data->event_file->tr; if (!is_var_ref(var_name)) return NULL; var_name++; var_field = find_event_var(hist_data, system, event_name, var_name); if (var_field) ref_field = create_var_ref(hist_data, var_field, system, event_name); if (!ref_field) hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name)); return ref_field; } static struct ftrace_event_field * parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file, char *field_str, unsigned long *flags, unsigned long *buckets) { struct ftrace_event_field *field = NULL; char *field_name, *modifier, *str; struct trace_array *tr = file->tr; modifier = str = kstrdup(field_str, GFP_KERNEL); if (!modifier) return ERR_PTR(-ENOMEM); field_name = strsep(&modifier, "."); if (modifier) { if (strcmp(modifier, "hex") == 0) *flags |= HIST_FIELD_FL_HEX; else if (strcmp(modifier, "sym") == 0) *flags |= HIST_FIELD_FL_SYM; /* * 'sym-offset' occurrences in the trigger string are modified * to 'symXoffset' to simplify arithmetic expression parsing. */ else if (strcmp(modifier, "symXoffset") == 0) *flags |= HIST_FIELD_FL_SYM_OFFSET; else if ((strcmp(modifier, "execname") == 0) && (strcmp(field_name, "common_pid") == 0)) *flags |= HIST_FIELD_FL_EXECNAME; else if (strcmp(modifier, "syscall") == 0) *flags |= HIST_FIELD_FL_SYSCALL; else if (strcmp(modifier, "stacktrace") == 0) *flags |= HIST_FIELD_FL_STACKTRACE; else if (strcmp(modifier, "log2") == 0) *flags |= HIST_FIELD_FL_LOG2; else if (strcmp(modifier, "usecs") == 0) *flags |= HIST_FIELD_FL_TIMESTAMP_USECS; else if (strncmp(modifier, "bucket", 6) == 0) { int ret; modifier += 6; if (*modifier == 's') modifier++; if (*modifier != '=') goto error; modifier++; ret = kstrtoul(modifier, 0, buckets); if (ret || !(*buckets)) goto error; *flags |= HIST_FIELD_FL_BUCKET; } else if (strncmp(modifier, "percent", 7) == 0) { if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY)) goto error; *flags |= HIST_FIELD_FL_PERCENT; } else if (strncmp(modifier, "graph", 5) == 0) { if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY)) goto error; *flags |= HIST_FIELD_FL_GRAPH; } else { error: hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier)); field = ERR_PTR(-EINVAL); goto out; } } if (strcmp(field_name, "common_timestamp") == 0) { *flags |= HIST_FIELD_FL_TIMESTAMP; hist_data->enable_timestamps = true; if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS) hist_data->attrs->ts_in_usecs = true; } else if (strcmp(field_name, "common_stacktrace") == 0) { *flags |= HIST_FIELD_FL_STACKTRACE; } else if (strcmp(field_name, "common_cpu") == 0) *flags |= HIST_FIELD_FL_CPU; else if (strcmp(field_name, "hitcount") == 0) *flags |= HIST_FIELD_FL_HITCOUNT; else { field = trace_find_event_field(file->event_call, field_name); if (!field || !field->size) { /* * For backward compatibility, if field_name * was "cpu" or "stacktrace", then we treat this * the same as common_cpu and common_stacktrace * respectively. This also works for "CPU", and * "STACKTRACE". */ if (field && field->filter_type == FILTER_CPU) { *flags |= HIST_FIELD_FL_CPU; } else if (field && field->filter_type == FILTER_STACKTRACE) { *flags |= HIST_FIELD_FL_STACKTRACE; } else { hist_err(tr, HIST_ERR_FIELD_NOT_FOUND, errpos(field_name)); field = ERR_PTR(-EINVAL); goto out; } } } out: kfree(str); return field; } static struct hist_field *create_alias(struct hist_trigger_data *hist_data, struct hist_field *var_ref, char *var_name) { struct hist_field *alias = NULL; unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR; alias = create_hist_field(hist_data, NULL, flags, var_name); if (!alias) return NULL; alias->fn_num = var_ref->fn_num; alias->operands[0] = var_ref; if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) { destroy_hist_field(alias, 0); return NULL; } alias->var_ref_idx = var_ref->var_ref_idx; return alias; } static struct hist_field *parse_const(struct hist_trigger_data *hist_data, char *str, char *var_name, unsigned long *flags) { struct trace_array *tr = hist_data->event_file->tr; struct hist_field *field = NULL; u64 constant; if (kstrtoull(str, 0, &constant)) { hist_err(tr, HIST_ERR_EXPECT_NUMBER, errpos(str)); return NULL; } *flags |= HIST_FIELD_FL_CONST; field = create_hist_field(hist_data, NULL, *flags, var_name); if (!field) return NULL; field->constant = constant; return field; } static struct hist_field *parse_atom(struct hist_trigger_data *hist_data, struct trace_event_file *file, char *str, unsigned long *flags, char *var_name) { char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str; struct ftrace_event_field *field = NULL; struct hist_field *hist_field = NULL; unsigned long buckets = 0; int ret = 0; if (isdigit(str[0])) { hist_field = parse_const(hist_data, str, var_name, flags); if (!hist_field) { ret = -EINVAL; goto out; } return hist_field; } s = strchr(str, '.'); if (s) { s = strchr(++s, '.'); if (s) { ref_system = strsep(&str, "."); if (!str) { ret = -EINVAL; goto out; } ref_event = strsep(&str, "."); if (!str) { ret = -EINVAL; goto out; } ref_var = str; } } s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var); if (!s) { hist_field = parse_var_ref(hist_data, ref_system, ref_event, ref_var); if (hist_field) { if (var_name) { hist_field = create_alias(hist_data, hist_field, var_name); if (!hist_field) { ret = -ENOMEM; goto out; } } return hist_field; } } else str = s; field = parse_field(hist_data, file, str, flags, &buckets); if (IS_ERR(field)) { ret = PTR_ERR(field); goto out; } hist_field = create_hist_field(hist_data, field, *flags, var_name); if (!hist_field) { ret = -ENOMEM; goto out; } hist_field->buckets = buckets; return hist_field; out: return ERR_PTR(ret); } static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, struct trace_event_file *file, char *str, unsigned long flags, char *var_name, unsigned int *n_subexprs); static struct hist_field *parse_unary(struct hist_trigger_data *hist_data, struct trace_event_file *file, char *str, unsigned long flags, char *var_name, unsigned int *n_subexprs) { struct hist_field *operand1, *expr = NULL; unsigned long operand_flags; int ret = 0; char *s; /* Unary minus operator, increment n_subexprs */ ++*n_subexprs; /* we support only -(xxx) i.e. explicit parens required */ if (*n_subexprs > 3) { hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str)); ret = -EINVAL; goto free; } str++; /* skip leading '-' */ s = strchr(str, '('); if (s) str++; else { ret = -EINVAL; goto free; } s = strrchr(str, ')'); if (s) { /* unary minus not supported in sub-expressions */ if (*(s+1) != '\0') { hist_err(file->tr, HIST_ERR_UNARY_MINUS_SUBEXPR, errpos(str)); ret = -EINVAL; goto free; } *s = '\0'; } else { ret = -EINVAL; /* no closing ')' */ goto free; } flags |= HIST_FIELD_FL_EXPR; expr = create_hist_field(hist_data, NULL, flags, var_name); if (!expr) { ret = -ENOMEM; goto free; } operand_flags = 0; operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, n_subexprs); if (IS_ERR(operand1)) { ret = PTR_ERR(operand1); goto free; } if (operand1->flags & HIST_FIELD_FL_STRING) { /* String type can not be the operand of unary operator. */ hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str)); destroy_hist_field(operand1, 0); ret = -EINVAL; goto free; } expr->flags |= operand1->flags & (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); expr->fn_num = HIST_FIELD_FN_UMINUS; expr->operands[0] = operand1; expr->size = operand1->size; expr->is_signed = operand1->is_signed; expr->operator = FIELD_OP_UNARY_MINUS; expr->name = expr_str(expr, 0); expr->type = kstrdup_const(operand1->type, GFP_KERNEL); if (!expr->type) { ret = -ENOMEM; goto free; } return expr; free: destroy_hist_field(expr, 0); return ERR_PTR(ret); } /* * If the operands are var refs, return pointers the * variable(s) referenced in var1 and var2, else NULL. */ static int check_expr_operands(struct trace_array *tr, struct hist_field *operand1, struct hist_field *operand2, struct hist_field **var1, struct hist_field **var2) { unsigned long operand1_flags = operand1->flags; unsigned long operand2_flags = operand2->flags; if ((operand1_flags & HIST_FIELD_FL_VAR_REF) || (operand1_flags & HIST_FIELD_FL_ALIAS)) { struct hist_field *var; var = find_var_field(operand1->var.hist_data, operand1->name); if (!var) return -EINVAL; operand1_flags = var->flags; *var1 = var; } if ((operand2_flags & HIST_FIELD_FL_VAR_REF) || (operand2_flags & HIST_FIELD_FL_ALIAS)) { struct hist_field *var; var = find_var_field(operand2->var.hist_data, operand2->name); if (!var) return -EINVAL; operand2_flags = var->flags; *var2 = var; } if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) != (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) { hist_err(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0); return -EINVAL; } return 0; } static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, struct trace_event_file *file, char *str, unsigned long flags, char *var_name, unsigned int *n_subexprs) { struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL; struct hist_field *var1 = NULL, *var2 = NULL; unsigned long operand_flags, operand2_flags; int field_op, ret = -EINVAL; char *sep, *operand1_str; enum hist_field_fn op_fn; bool combine_consts; if (*n_subexprs > 3) { hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str)); return ERR_PTR(-EINVAL); } field_op = contains_operator(str, &sep); if (field_op == FIELD_OP_NONE) return parse_atom(hist_data, file, str, &flags, var_name); if (field_op == FIELD_OP_UNARY_MINUS) return parse_unary(hist_data, file, str, flags, var_name, n_subexprs); /* Binary operator found, increment n_subexprs */ ++*n_subexprs; /* Split the expression string at the root operator */ if (!sep) return ERR_PTR(-EINVAL); *sep = '\0'; operand1_str = str; str = sep+1; /* Binary operator requires both operands */ if (*operand1_str == '\0' || *str == '\0') return ERR_PTR(-EINVAL); operand_flags = 0; /* LHS of string is an expression e.g. a+b in a+b+c */ operand1 = parse_expr(hist_data, file, operand1_str, operand_flags, NULL, n_subexprs); if (IS_ERR(operand1)) return ERR_CAST(operand1); if (operand1->flags & HIST_FIELD_FL_STRING) { hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(operand1_str)); ret = -EINVAL; goto free_op1; } /* RHS of string is another expression e.g. c in a+b+c */ operand_flags = 0; operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, n_subexprs); if (IS_ERR(operand2)) { ret = PTR_ERR(operand2); goto free_op1; } if (operand2->flags & HIST_FIELD_FL_STRING) { hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str)); ret = -EINVAL; goto free_operands; } switch (field_op) { case FIELD_OP_MINUS: op_fn = HIST_FIELD_FN_MINUS; break; case FIELD_OP_PLUS: op_fn = HIST_FIELD_FN_PLUS; break; case FIELD_OP_DIV: op_fn = HIST_FIELD_FN_DIV; break; case FIELD_OP_MULT: op_fn = HIST_FIELD_FN_MULT; break; default: ret = -EINVAL; goto free_operands; } ret = check_expr_operands(file->tr, operand1, operand2, &var1, &var2); if (ret) goto free_operands; operand_flags = var1 ? var1->flags : operand1->flags; operand2_flags = var2 ? var2->flags : operand2->flags; /* * If both operands are constant, the expression can be * collapsed to a single constant. */ combine_consts = operand_flags & operand2_flags & HIST_FIELD_FL_CONST; flags |= combine_consts ? HIST_FIELD_FL_CONST : HIST_FIELD_FL_EXPR; flags |= operand1->flags & (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); expr = create_hist_field(hist_data, NULL, flags, var_name); if (!expr) { ret = -ENOMEM; goto free_operands; } operand1->read_once = true; operand2->read_once = true; /* The operands are now owned and free'd by 'expr' */ expr->operands[0] = operand1; expr->operands[1] = operand2; if (field_op == FIELD_OP_DIV && operand2_flags & HIST_FIELD_FL_CONST) { u64 divisor = var2 ? var2->constant : operand2->constant; if (!divisor) { hist_err(file->tr, HIST_ERR_DIVISION_BY_ZERO, errpos(str)); ret = -EDOM; goto free_expr; } /* * Copy the divisor here so we don't have to look it up * later if this is a var ref */ operand2->constant = divisor; op_fn = hist_field_get_div_fn(operand2); } expr->fn_num = op_fn; if (combine_consts) { if (var1) expr->operands[0] = var1; if (var2) expr->operands[1] = var2; expr->constant = hist_fn_call(expr, NULL, NULL, NULL, NULL); expr->fn_num = HIST_FIELD_FN_CONST; expr->operands[0] = NULL; expr->operands[1] = NULL; /* * var refs won't be destroyed immediately * See: destroy_hist_field() */ destroy_hist_field(operand2, 0); destroy_hist_field(operand1, 0); expr->name = expr_str(expr, 0); } else { /* The operand sizes should be the same, so just pick one */ expr->size = operand1->size; expr->is_signed = operand1->is_signed; expr->operator = field_op; expr->type = kstrdup_const(operand1->type, GFP_KERNEL); if (!expr->type) { ret = -ENOMEM; goto free_expr; } expr->name = expr_str(expr, 0); } return expr; free_operands: destroy_hist_field(operand2, 0); free_op1: destroy_hist_field(operand1, 0); return ERR_PTR(ret); free_expr: destroy_hist_field(expr, 0); return ERR_PTR(ret); } static char *find_trigger_filter(struct hist_trigger_data *hist_data, struct trace_event_file *file) { struct event_trigger_data *test; lockdep_assert_held(&event_mutex); list_for_each_entry(test, &file->triggers, list) { if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { if (test->private_data == hist_data) return test->filter_str; } } return NULL; } static struct event_command trigger_hist_cmd; static int event_hist_trigger_parse(struct event_command *cmd_ops, struct trace_event_file *file, char *glob, char *cmd, char *param_and_filter); static bool compatible_keys(struct hist_trigger_data *target_hist_data, struct hist_trigger_data *hist_data, unsigned int n_keys) { struct hist_field *target_hist_field, *hist_field; unsigned int n, i, j; if (hist_data->n_fields - hist_data->n_vals != n_keys) return false; i = hist_data->n_vals; j = target_hist_data->n_vals; for (n = 0; n < n_keys; n++) { hist_field = hist_data->fields[i + n]; target_hist_field = target_hist_data->fields[j + n]; if (strcmp(hist_field->type, target_hist_field->type) != 0) return false; if (hist_field->size != target_hist_field->size) return false; if (hist_field->is_signed != target_hist_field->is_signed) return false; } return true; } static struct hist_trigger_data * find_compatible_hist(struct hist_trigger_data *target_hist_data, struct trace_event_file *file) { struct hist_trigger_data *hist_data; struct event_trigger_data *test; unsigned int n_keys; lockdep_assert_held(&event_mutex); n_keys = target_hist_data->n_fields - target_hist_data->n_vals; list_for_each_entry(test, &file->triggers, list) { if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { hist_data = test->private_data; if (compatible_keys(target_hist_data, hist_data, n_keys)) return hist_data; } } return NULL; } static struct trace_event_file *event_file(struct trace_array *tr, char *system, char *event_name) { struct trace_event_file *file; file = __find_event_file(tr, system, event_name); if (!file) return ERR_PTR(-EINVAL); return file; } static struct hist_field * find_synthetic_field_var(struct hist_trigger_data *target_hist_data, char *system, char *event_name, char *field_name) { struct hist_field *event_var; char *synthetic_name; synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); if (!synthetic_name) return ERR_PTR(-ENOMEM); strcpy(synthetic_name, "synthetic_"); strcat(synthetic_name, field_name); event_var = find_event_var(target_hist_data, system, event_name, synthetic_name); kfree(synthetic_name); return event_var; } /** * create_field_var_hist - Automatically create a histogram and var for a field * @target_hist_data: The target hist trigger * @subsys_name: Optional subsystem name * @event_name: Optional event name * @field_name: The name of the field (and the resulting variable) * * Hist trigger actions fetch data from variables, not directly from * events. However, for convenience, users are allowed to directly * specify an event field in an action, which will be automatically * converted into a variable on their behalf. * * If a user specifies a field on an event that isn't the event the * histogram currently being defined (the target event histogram), the * only way that can be accomplished is if a new hist trigger is * created and the field variable defined on that. * * This function creates a new histogram compatible with the target * event (meaning a histogram with the same key as the target * histogram), and creates a variable for the specified field, but * with 'synthetic_' prepended to the variable name in order to avoid * collision with normal field variables. * * Return: The variable created for the field. */ static struct hist_field * create_field_var_hist(struct hist_trigger_data *target_hist_data, char *subsys_name, char *event_name, char *field_name) { struct trace_array *tr = target_hist_data->event_file->tr; struct hist_trigger_data *hist_data; unsigned int i, n, first = true; struct field_var_hist *var_hist; struct trace_event_file *file; struct hist_field *key_field; struct hist_field *event_var; char *saved_filter; char *cmd; int ret; if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) { hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name)); return ERR_PTR(-EINVAL); } file = event_file(tr, subsys_name, event_name); if (IS_ERR(file)) { hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name)); ret = PTR_ERR(file); return ERR_PTR(ret); } /* * Look for a histogram compatible with target. We'll use the * found histogram specification to create a new matching * histogram with our variable on it. target_hist_data is not * yet a registered histogram so we can't use that. */ hist_data = find_compatible_hist(target_hist_data, file); if (!hist_data) { hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name)); return ERR_PTR(-EINVAL); } /* See if a synthetic field variable has already been created */ event_var = find_synthetic_field_var(target_hist_data, subsys_name, event_name, field_name); if (!IS_ERR_OR_NULL(event_var)) return event_var; var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL); if (!var_hist) return ERR_PTR(-ENOMEM); cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); if (!cmd) { kfree(var_hist); return ERR_PTR(-ENOMEM); } /* Use the same keys as the compatible histogram */ strcat(cmd, "keys="); for_each_hist_key_field(i, hist_data) { key_field = hist_data->fields[i]; if (!first) strcat(cmd, ","); strcat(cmd, key_field->field->name); first = false; } /* Create the synthetic field variable specification */ strcat(cmd, ":synthetic_"); strcat(cmd, field_name); strcat(cmd, "="); strcat(cmd, field_name); /* Use the same filter as the compatible histogram */ saved_filter = find_trigger_filter(hist_data, file); if (saved_filter) { strcat(cmd, " if "); strcat(cmd, saved_filter); } var_hist->cmd = kstrdup(cmd, GFP_KERNEL); if (!var_hist->cmd) { kfree(cmd); kfree(var_hist); return ERR_PTR(-ENOMEM); } /* Save the compatible histogram information */ var_hist->hist_data = hist_data; /* Create the new histogram with our variable */ ret = event_hist_trigger_parse(&trigger_hist_cmd, file, "", "hist", cmd); if (ret) { kfree(cmd); kfree(var_hist->cmd); kfree(var_hist); hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name)); return ERR_PTR(ret); } kfree(cmd); /* If we can't find the variable, something went wrong */ event_var = find_synthetic_field_var(target_hist_data, subsys_name, event_name, field_name); if (IS_ERR_OR_NULL(event_var)) { kfree(var_hist->cmd); kfree(var_hist); hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name)); return ERR_PTR(-EINVAL); } n = target_hist_data->n_field_var_hists; target_hist_data->field_var_hists[n] = var_hist; target_hist_data->n_field_var_hists++; return event_var; } static struct hist_field * find_target_event_var(struct hist_trigger_data *hist_data, char *subsys_name, char *event_name, char *var_name) { struct trace_event_file *file = hist_data->event_file; struct hist_field *hist_field = NULL; if (subsys_name) { struct trace_event_call *call; if (!event_name) return NULL; call = file->event_call; if (strcmp(subsys_name, call->class->system) != 0) return NULL; if (strcmp(event_name, trace_event_name(call)) != 0) return NULL; } hist_field = find_var_field(hist_data, var_name); return hist_field; } static inline void __update_field_vars(struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *rec, struct field_var **field_vars, unsigned int n_field_vars, unsigned int field_var_str_start) { struct hist_elt_data *elt_data = elt->private_data; unsigned int i, j, var_idx; u64 var_val; /* Make sure stacktrace can fit in the string variable length */ BUILD_BUG_ON((HIST_STACKTRACE_DEPTH + 1) * sizeof(long) >= STR_VAR_LEN_MAX); for (i = 0, j = field_var_str_start; i < n_field_vars; i++) { struct field_var *field_var = field_vars[i]; struct hist_field *var = field_var->var; struct hist_field *val = field_var->val; var_val = hist_fn_call(val, elt, buffer, rbe, rec); var_idx = var->var.idx; if (val->flags & (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE)) { char *str = elt_data->field_var_str[j++]; char *val_str = (char *)(uintptr_t)var_val; unsigned int size; if (val->flags & HIST_FIELD_FL_STRING) { size = min(val->size, STR_VAR_LEN_MAX); strscpy(str, val_str, size); } else { char *stack_start = str + sizeof(unsigned long); int e; e = stack_trace_save((void *)stack_start, HIST_STACKTRACE_DEPTH, HIST_STACKTRACE_SKIP); if (e < HIST_STACKTRACE_DEPTH - 1) ((unsigned long *)stack_start)[e] = 0; *((unsigned long *)str) = e; } var_val = (u64)(uintptr_t)str; } tracing_map_set_var(elt, var_idx, var_val); } } static void update_field_vars(struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *rec) { __update_field_vars(elt, buffer, rbe, rec, hist_data->field_vars, hist_data->n_field_vars, 0); } static void save_track_data_vars(struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *rbe, void *key, struct action_data *data, u64 *var_ref_vals) { __update_field_vars(elt, buffer, rbe, rec, hist_data->save_vars, hist_data->n_save_vars, hist_data->n_field_var_str); } static struct hist_field *create_var(struct hist_trigger_data *hist_data, struct trace_event_file *file, char *name, int size, const char *type) { struct hist_field *var; int idx; if (find_var(hist_data, file, name) && !hist_data->remove) { var = ERR_PTR(-EINVAL); goto out; } var = kzalloc(sizeof(struct hist_field), GFP_KERNEL); if (!var) { var = ERR_PTR(-ENOMEM); goto out; } idx = tracing_map_add_var(hist_data->map); if (idx < 0) { kfree(var); var = ERR_PTR(-EINVAL); goto out; } var->ref = 1; var->flags = HIST_FIELD_FL_VAR; var->var.idx = idx; var->var.hist_data = var->hist_data = hist_data; var->size = size; var->var.name = kstrdup(name, GFP_KERNEL); var->type = kstrdup_const(type, GFP_KERNEL); if (!var->var.name || !var->type) { kfree_const(var->type); kfree(var->var.name); kfree(var); var = ERR_PTR(-ENOMEM); } out: return var; } static struct field_var *create_field_var(struct hist_trigger_data *hist_data, struct trace_event_file *file, char *field_name) { struct hist_field *val = NULL, *var = NULL; unsigned long flags = HIST_FIELD_FL_VAR; struct trace_array *tr = file->tr; struct field_var *field_var; int ret = 0; if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) { hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name)); ret = -EINVAL; goto err; } val = parse_atom(hist_data, file, field_name, &flags, NULL); if (IS_ERR(val)) { hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name)); ret = PTR_ERR(val); goto err; } var = create_var(hist_data, file, field_name, val->size, val->type); if (IS_ERR(var)) { hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name)); kfree(val); ret = PTR_ERR(var); goto err; } field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL); if (!field_var) { kfree(val); kfree(var); ret = -ENOMEM; goto err; } field_var->var = var; field_var->val = val; out: return field_var; err: field_var = ERR_PTR(ret); goto out; } /** * create_target_field_var - Automatically create a variable for a field * @target_hist_data: The target hist trigger * @subsys_name: Optional subsystem name * @event_name: Optional event name * @var_name: The name of the field (and the resulting variable) * * Hist trigger actions fetch data from variables, not directly from * events. However, for convenience, users are allowed to directly * specify an event field in an action, which will be automatically * converted into a variable on their behalf. * * This function creates a field variable with the name var_name on * the hist trigger currently being defined on the target event. If * subsys_name and event_name are specified, this function simply * verifies that they do in fact match the target event subsystem and * event name. * * Return: The variable created for the field. */ static struct field_var * create_target_field_var(struct hist_trigger_data *target_hist_data, char *subsys_name, char *event_name, char *var_name) { struct trace_event_file *file = target_hist_data->event_file; if (subsys_name) { struct trace_event_call *call; if (!event_name) return NULL; call = file->event_call; if (strcmp(subsys_name, call->class->system) != 0) return NULL; if (strcmp(event_name, trace_event_name(call)) != 0) return NULL; } return create_field_var(target_hist_data, file, var_name); } static bool check_track_val_max(u64 track_val, u64 var_val) { if (var_val <= track_val) return false; return true; } static bool check_track_val_changed(u64 track_val, u64 var_val) { if (var_val == track_val) return false; return true; } static u64 get_track_val(struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct action_data *data) { unsigned int track_var_idx = data->track_data.track_var->var.idx; u64 track_val; track_val = tracing_map_read_var(elt, track_var_idx); return track_val; } static void save_track_val(struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct action_data *data, u64 var_val) { unsigned int track_var_idx = data->track_data.track_var->var.idx; tracing_map_set_var(elt, track_var_idx, var_val); } static void save_track_data(struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *rbe, void *key, struct action_data *data, u64 *var_ref_vals) { if (data->track_data.save_data) data->track_data.save_data(hist_data, elt, buffer, rec, rbe, key, data, var_ref_vals); } static bool check_track_val(struct tracing_map_elt *elt, struct action_data *data, u64 var_val) { struct hist_trigger_data *hist_data; u64 track_val; hist_data = data->track_data.track_var->hist_data; track_val = get_track_val(hist_data, elt, data); return data->track_data.check_val(track_val, var_val); } #ifdef CONFIG_TRACER_SNAPSHOT static bool cond_snapshot_update(struct trace_array *tr, void *cond_data) { /* called with tr->max_lock held */ struct track_data *track_data = tr->cond_snapshot->cond_data; struct hist_elt_data *elt_data, *track_elt_data; struct snapshot_context *context = cond_data; struct action_data *action; u64 track_val; if (!track_data) return false; action = track_data->action_data; track_val = get_track_val(track_data->hist_data, context->elt, track_data->action_data); if (!action->track_data.check_val(track_data->track_val, track_val)) return false; track_data->track_val = track_val; memcpy(track_data->key, context->key, track_data->key_len); elt_data = context->elt->private_data; track_elt_data = track_data->elt.private_data; if (elt_data->comm) strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN); track_data->updated = true; return true; } static void save_track_data_snapshot(struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *rbe, void *key, struct action_data *data, u64 *var_ref_vals) { struct trace_event_file *file = hist_data->event_file; struct snapshot_context context; context.elt = elt; context.key = key; tracing_snapshot_cond(file->tr, &context); } static void hist_trigger_print_key(struct seq_file *m, struct hist_trigger_data *hist_data, void *key, struct tracing_map_elt *elt); static struct action_data *snapshot_action(struct hist_trigger_data *hist_data) { unsigned int i; if (!hist_data->n_actions) return NULL; for (i = 0; i < hist_data->n_actions; i++) { struct action_data *data = hist_data->actions[i]; if (data->action == ACTION_SNAPSHOT) return data; } return NULL; } static void track_data_snapshot_print(struct seq_file *m, struct hist_trigger_data *hist_data) { struct trace_event_file *file = hist_data->event_file; struct track_data *track_data; struct action_data *action; track_data = tracing_cond_snapshot_data(file->tr); if (!track_data) return; if (!track_data->updated) return; action = snapshot_action(hist_data); if (!action) return; seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n"); seq_printf(m, "\ttriggering value { %s(%s) }: %10llu", action->handler == HANDLER_ONMAX ? "onmax" : "onchange", action->track_data.var_str, track_data->track_val); seq_puts(m, "\ttriggered by event with key: "); hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt); seq_putc(m, '\n'); } #else static bool cond_snapshot_update(struct trace_array *tr, void *cond_data) { return false; } static void save_track_data_snapshot(struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *rbe, void *key, struct action_data *data, u64 *var_ref_vals) {} static void track_data_snapshot_print(struct seq_file *m, struct hist_trigger_data *hist_data) {} #endif /* CONFIG_TRACER_SNAPSHOT */ static void track_data_print(struct seq_file *m, struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct action_data *data) { u64 track_val = get_track_val(hist_data, elt, data); unsigned int i, save_var_idx; if (data->handler == HANDLER_ONMAX) seq_printf(m, "\n\tmax: %10llu", track_val); else if (data->handler == HANDLER_ONCHANGE) seq_printf(m, "\n\tchanged: %10llu", track_val); if (data->action == ACTION_SNAPSHOT) return; for (i = 0; i < hist_data->n_save_vars; i++) { struct hist_field *save_val = hist_data->save_vars[i]->val; struct hist_field *save_var = hist_data->save_vars[i]->var; u64 val; save_var_idx = save_var->var.idx; val = tracing_map_read_var(elt, save_var_idx); if (save_val->flags & HIST_FIELD_FL_STRING) { seq_printf(m, " %s: %-32s", save_var->var.name, (char *)(uintptr_t)(val)); } else seq_printf(m, " %s: %10llu", save_var->var.name, val); } } static void ontrack_action(struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *rbe, void *key, struct action_data *data, u64 *var_ref_vals) { u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx]; if (check_track_val(elt, data, var_val)) { save_track_val(hist_data, elt, data, var_val); save_track_data(hist_data, elt, buffer, rec, rbe, key, data, var_ref_vals); } } static void action_data_destroy(struct action_data *data) { unsigned int i; lockdep_assert_held(&event_mutex); kfree(data->action_name); for (i = 0; i < data->n_params; i++) kfree(data->params[i]); if (data->synth_event) data->synth_event->ref--; kfree(data->synth_event_name); kfree(data); } static void track_data_destroy(struct hist_trigger_data *hist_data, struct action_data *data) { struct trace_event_file *file = hist_data->event_file; destroy_hist_field(data->track_data.track_var, 0); if (data->action == ACTION_SNAPSHOT) { struct track_data *track_data; track_data = tracing_cond_snapshot_data(file->tr); if (track_data && track_data->hist_data == hist_data) { tracing_snapshot_cond_disable(file->tr); track_data_free(track_data); } } kfree(data->track_data.var_str); action_data_destroy(data); } static int action_create(struct hist_trigger_data *hist_data, struct action_data *data); static int track_data_create(struct hist_trigger_data *hist_data, struct action_data *data) { struct hist_field *var_field, *ref_field, *track_var = NULL; struct trace_event_file *file = hist_data->event_file; struct trace_array *tr = file->tr; char *track_data_var_str; int ret = 0; track_data_var_str = data->track_data.var_str; if (track_data_var_str[0] != '$') { hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str)); return -EINVAL; } track_data_var_str++; var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str); if (!var_field) { hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str)); return -EINVAL; } ref_field = create_var_ref(hist_data, var_field, NULL, NULL); if (!ref_field) return -ENOMEM; data->track_data.var_ref = ref_field; if (data->handler == HANDLER_ONMAX) track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64"); if (IS_ERR(track_var)) { hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0); ret = PTR_ERR(track_var); goto out; } if (data->handler == HANDLER_ONCHANGE) track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64"); if (IS_ERR(track_var)) { hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0); ret = PTR_ERR(track_var); goto out; } data->track_data.track_var = track_var; ret = action_create(hist_data, data); out: return ret; } static int parse_action_params(struct trace_array *tr, char *params, struct action_data *data) { char *param, *saved_param; bool first_param = true; int ret = 0; while (params) { if (data->n_params >= SYNTH_FIELDS_MAX) { hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0); ret = -EINVAL; goto out; } param = strsep(¶ms, ","); if (!param) { hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0); ret = -EINVAL; goto out; } param = strstrip(param); if (strlen(param) < 2) { hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param)); ret = -EINVAL; goto out; } saved_param = kstrdup(param, GFP_KERNEL); if (!saved_param) { ret = -ENOMEM; goto out; } if (first_param && data->use_trace_keyword) { data->synth_event_name = saved_param; first_param = false; continue; } first_param = false; data->params[data->n_params++] = saved_param; } out: return ret; } static int action_parse(struct trace_array *tr, char *str, struct action_data *data, enum handler_id handler) { char *action_name; int ret = 0; strsep(&str, "."); if (!str) { hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0); ret = -EINVAL; goto out; } action_name = strsep(&str, "("); if (!action_name || !str) { hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0); ret = -EINVAL; goto out; } if (str_has_prefix(action_name, "save")) { char *params = strsep(&str, ")"); if (!params) { hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0); ret = -EINVAL; goto out; } ret = parse_action_params(tr, params, data); if (ret) goto out; if (handler == HANDLER_ONMAX) data->track_data.check_val = check_track_val_max; else if (handler == HANDLER_ONCHANGE) data->track_data.check_val = check_track_val_changed; else { hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name)); ret = -EINVAL; goto out; } data->track_data.save_data = save_track_data_vars; data->fn = ontrack_action; data->action = ACTION_SAVE; } else if (str_has_prefix(action_name, "snapshot")) { char *params = strsep(&str, ")"); if (!str) { hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params)); ret = -EINVAL; goto out; } if (handler == HANDLER_ONMAX) data->track_data.check_val = check_track_val_max; else if (handler == HANDLER_ONCHANGE) data->track_data.check_val = check_track_val_changed; else { hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name)); ret = -EINVAL; goto out; } data->track_data.save_data = save_track_data_snapshot; data->fn = ontrack_action; data->action = ACTION_SNAPSHOT; } else { char *params = strsep(&str, ")"); if (str_has_prefix(action_name, "trace")) data->use_trace_keyword = true; if (params) { ret = parse_action_params(tr, params, data); if (ret) goto out; } if (handler == HANDLER_ONMAX) data->track_data.check_val = check_track_val_max; else if (handler == HANDLER_ONCHANGE) data->track_data.check_val = check_track_val_changed; if (handler != HANDLER_ONMATCH) { data->track_data.save_data = action_trace; data->fn = ontrack_action; } else data->fn = action_trace; data->action = ACTION_TRACE; } data->action_name = kstrdup(action_name, GFP_KERNEL); if (!data->action_name) { ret = -ENOMEM; goto out; } data->handler = handler; out: return ret; } static struct action_data *track_data_parse(struct hist_trigger_data *hist_data, char *str, enum handler_id handler) { struct action_data *data; int ret = -EINVAL; char *var_str; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return ERR_PTR(-ENOMEM); var_str = strsep(&str, ")"); if (!var_str || !str) { ret = -EINVAL; goto free; } data->track_data.var_str = kstrdup(var_str, GFP_KERNEL); if (!data->track_data.var_str) { ret = -ENOMEM; goto free; } ret = action_parse(hist_data->event_file->tr, str, data, handler); if (ret) goto free; out: return data; free: track_data_destroy(hist_data, data); data = ERR_PTR(ret); goto out; } static void onmatch_destroy(struct action_data *data) { kfree(data->match_data.event); kfree(data->match_data.event_system); action_data_destroy(data); } static void destroy_field_var(struct field_var *field_var) { if (!field_var) return; destroy_hist_field(field_var->var, 0); destroy_hist_field(field_var->val, 0); kfree(field_var); } static void destroy_field_vars(struct hist_trigger_data *hist_data) { unsigned int i; for (i = 0; i < hist_data->n_field_vars; i++) destroy_field_var(hist_data->field_vars[i]); for (i = 0; i < hist_data->n_save_vars; i++) destroy_field_var(hist_data->save_vars[i]); } static void save_field_var(struct hist_trigger_data *hist_data, struct field_var *field_var) { hist_data->field_vars[hist_data->n_field_vars++] = field_var; /* Stack traces are saved in the string storage too */ if (field_var->val->flags & (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE)) hist_data->n_field_var_str++; } static int check_synth_field(struct synth_event *event, struct hist_field *hist_field, unsigned int field_pos) { struct synth_field *field; if (field_pos >= event->n_fields) return -EINVAL; field = event->fields[field_pos]; /* * A dynamic string synth field can accept static or * dynamic. A static string synth field can only accept a * same-sized static string, which is checked for later. */ if (strstr(hist_field->type, "char[") && field->is_string && field->is_dynamic) return 0; if (strstr(hist_field->type, "long[") && field->is_stack) return 0; if (strcmp(field->type, hist_field->type) != 0) { if (field->size != hist_field->size || (!field->is_string && field->is_signed != hist_field->is_signed)) return -EINVAL; } return 0; } static struct hist_field * trace_action_find_var(struct hist_trigger_data *hist_data, struct action_data *data, char *system, char *event, char *var) { struct trace_array *tr = hist_data->event_file->tr; struct hist_field *hist_field; var++; /* skip '$' */ hist_field = find_target_event_var(hist_data, system, event, var); if (!hist_field) { if (!system && data->handler == HANDLER_ONMATCH) { system = data->match_data.event_system; event = data->match_data.event; } hist_field = find_event_var(hist_data, system, event, var); } if (!hist_field) hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var)); return hist_field; } static struct hist_field * trace_action_create_field_var(struct hist_trigger_data *hist_data, struct action_data *data, char *system, char *event, char *var) { struct hist_field *hist_field = NULL; struct field_var *field_var; /* * First try to create a field var on the target event (the * currently being defined). This will create a variable for * unqualified fields on the target event, or if qualified, * target fields that have qualified names matching the target. */ field_var = create_target_field_var(hist_data, system, event, var); if (field_var && !IS_ERR(field_var)) { save_field_var(hist_data, field_var); hist_field = field_var->var; } else { field_var = NULL; /* * If no explicit system.event is specified, default to * looking for fields on the onmatch(system.event.xxx) * event. */ if (!system && data->handler == HANDLER_ONMATCH) { system = data->match_data.event_system; event = data->match_data.event; } if (!event) goto free; /* * At this point, we're looking at a field on another * event. Because we can't modify a hist trigger on * another event to add a variable for a field, we need * to create a new trigger on that event and create the * variable at the same time. */ hist_field = create_field_var_hist(hist_data, system, event, var); if (IS_ERR(hist_field)) goto free; } out: return hist_field; free: destroy_field_var(field_var); hist_field = NULL; goto out; } static int trace_action_create(struct hist_trigger_data *hist_data, struct action_data *data) { struct trace_array *tr = hist_data->event_file->tr; char *event_name, *param, *system = NULL; struct hist_field *hist_field, *var_ref; unsigned int i; unsigned int field_pos = 0; struct synth_event *event; char *synth_event_name; int var_ref_idx, ret = 0; lockdep_assert_held(&event_mutex); /* Sanity check to avoid out-of-bound write on 'data->var_ref_idx' */ if (data->n_params > SYNTH_FIELDS_MAX) return -EINVAL; if (data->use_trace_keyword) synth_event_name = data->synth_event_name; else synth_event_name = data->action_name; event = find_synth_event(synth_event_name); if (!event) { hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name)); return -EINVAL; } event->ref++; for (i = 0; i < data->n_params; i++) { char *p; p = param = kstrdup(data->params[i], GFP_KERNEL); if (!param) { ret = -ENOMEM; goto err; } system = strsep(¶m, "."); if (!param) { param = (char *)system; system = event_name = NULL; } else { event_name = strsep(¶m, "."); if (!param) { kfree(p); ret = -EINVAL; goto err; } } if (param[0] == '$') hist_field = trace_action_find_var(hist_data, data, system, event_name, param); else hist_field = trace_action_create_field_var(hist_data, data, system, event_name, param); if (!hist_field) { kfree(p); ret = -EINVAL; goto err; } if (check_synth_field(event, hist_field, field_pos) == 0) { var_ref = create_var_ref(hist_data, hist_field, system, event_name); if (!var_ref) { kfree(p); ret = -ENOMEM; goto err; } var_ref_idx = find_var_ref_idx(hist_data, var_ref); if (WARN_ON(var_ref_idx < 0)) { kfree(p); ret = var_ref_idx; goto err; } data->var_ref_idx[i] = var_ref_idx; field_pos++; kfree(p); continue; } hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param)); kfree(p); ret = -EINVAL; goto err; } if (field_pos != event->n_fields) { hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name)); ret = -EINVAL; goto err; } data->synth_event = event; out: return ret; err: event->ref--; goto out; } static int action_create(struct hist_trigger_data *hist_data, struct action_data *data) { struct trace_event_file *file = hist_data->event_file; struct trace_array *tr = file->tr; struct track_data *track_data; struct field_var *field_var; unsigned int i; char *param; int ret = 0; if (data->action == ACTION_TRACE) return trace_action_create(hist_data, data); if (data->action == ACTION_SNAPSHOT) { track_data = track_data_alloc(hist_data->key_size, data, hist_data); if (IS_ERR(track_data)) { ret = PTR_ERR(track_data); goto out; } ret = tracing_snapshot_cond_enable(file->tr, track_data, cond_snapshot_update); if (ret) track_data_free(track_data); goto out; } if (data->action == ACTION_SAVE) { if (hist_data->n_save_vars) { ret = -EEXIST; hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0); goto out; } for (i = 0; i < data->n_params; i++) { param = kstrdup(data->params[i], GFP_KERNEL); if (!param) { ret = -ENOMEM; goto out; } field_var = create_target_field_var(hist_data, NULL, NULL, param); if (IS_ERR(field_var)) { hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL, errpos(param)); ret = PTR_ERR(field_var); kfree(param); goto out; } hist_data->save_vars[hist_data->n_save_vars++] = field_var; if (field_var->val->flags & (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE)) hist_data->n_save_var_str++; kfree(param); } } out: return ret; } static int onmatch_create(struct hist_trigger_data *hist_data, struct action_data *data) { return action_create(hist_data, data); } static struct action_data *onmatch_parse(struct trace_array *tr, char *str) { char *match_event, *match_event_system; struct action_data *data; int ret = -EINVAL; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return ERR_PTR(-ENOMEM); match_event = strsep(&str, ")"); if (!match_event || !str) { hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event)); goto free; } match_event_system = strsep(&match_event, "."); if (!match_event) { hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system)); goto free; } if (IS_ERR(event_file(tr, match_event_system, match_event))) { hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event)); goto free; } data->match_data.event = kstrdup(match_event, GFP_KERNEL); if (!data->match_data.event) { ret = -ENOMEM; goto free; } data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL); if (!data->match_data.event_system) { ret = -ENOMEM; goto free; } ret = action_parse(tr, str, data, HANDLER_ONMATCH); if (ret) goto free; out: return data; free: onmatch_destroy(data); data = ERR_PTR(ret); goto out; } static int create_hitcount_val(struct hist_trigger_data *hist_data) { hist_data->fields[HITCOUNT_IDX] = create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL); if (!hist_data->fields[HITCOUNT_IDX]) return -ENOMEM; hist_data->n_vals++; hist_data->n_fields++; if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX)) return -EINVAL; return 0; } static int __create_val_field(struct hist_trigger_data *hist_data, unsigned int val_idx, struct trace_event_file *file, char *var_name, char *field_str, unsigned long flags) { struct hist_field *hist_field; int ret = 0, n_subexprs = 0; hist_field = parse_expr(hist_data, file, field_str, flags, var_name, &n_subexprs); if (IS_ERR(hist_field)) { ret = PTR_ERR(hist_field); goto out; } /* values and variables should not have some modifiers */ if (hist_field->flags & HIST_FIELD_FL_VAR) { /* Variable */ if (hist_field->flags & (HIST_FIELD_FL_GRAPH | HIST_FIELD_FL_PERCENT | HIST_FIELD_FL_BUCKET | HIST_FIELD_FL_LOG2)) goto err; } else { /* Value */ if (hist_field->flags & (HIST_FIELD_FL_GRAPH | HIST_FIELD_FL_PERCENT | HIST_FIELD_FL_BUCKET | HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_SYM | HIST_FIELD_FL_SYM_OFFSET | HIST_FIELD_FL_SYSCALL | HIST_FIELD_FL_STACKTRACE)) goto err; } hist_data->fields[val_idx] = hist_field; ++hist_data->n_vals; ++hist_data->n_fields; if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) ret = -EINVAL; out: return ret; err: hist_err(file->tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(field_str)); return -EINVAL; } static int create_val_field(struct hist_trigger_data *hist_data, unsigned int val_idx, struct trace_event_file *file, char *field_str) { if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX)) return -EINVAL; return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0); } static const char no_comm[] = "(no comm)"; static u64 hist_field_execname(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { struct hist_elt_data *elt_data; if (WARN_ON_ONCE(!elt)) return (u64)(unsigned long)no_comm; elt_data = elt->private_data; if (WARN_ON_ONCE(!elt_data->comm)) return (u64)(unsigned long)no_comm; return (u64)(unsigned long)(elt_data->comm); } static u64 hist_field_stack(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { u32 str_item = *(u32 *)(event + hist_field->field->offset); int str_loc = str_item & 0xffff; char *addr = (char *)(event + str_loc); return (u64)(unsigned long)addr; } static u64 hist_fn_call(struct hist_field *hist_field, struct tracing_map_elt *elt, struct trace_buffer *buffer, struct ring_buffer_event *rbe, void *event) { switch (hist_field->fn_num) { case HIST_FIELD_FN_VAR_REF: return hist_field_var_ref(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_COUNTER: return hist_field_counter(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_CONST: return hist_field_const(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_LOG2: return hist_field_log2(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_BUCKET: return hist_field_bucket(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_TIMESTAMP: return hist_field_timestamp(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_CPU: return hist_field_cpu(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_STRING: return hist_field_string(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_DYNSTRING: return hist_field_dynstring(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_RELDYNSTRING: return hist_field_reldynstring(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_PSTRING: return hist_field_pstring(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_S64: return hist_field_s64(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_U64: return hist_field_u64(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_S32: return hist_field_s32(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_U32: return hist_field_u32(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_S16: return hist_field_s16(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_U16: return hist_field_u16(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_S8: return hist_field_s8(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_U8: return hist_field_u8(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_UMINUS: return hist_field_unary_minus(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_MINUS: return hist_field_minus(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_PLUS: return hist_field_plus(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_DIV: return hist_field_div(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_MULT: return hist_field_mult(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_DIV_POWER2: return div_by_power_of_two(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_DIV_NOT_POWER2: return div_by_not_power_of_two(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_DIV_MULT_SHIFT: return div_by_mult_and_shift(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_EXECNAME: return hist_field_execname(hist_field, elt, buffer, rbe, event); case HIST_FIELD_FN_STACK: return hist_field_stack(hist_field, elt, buffer, rbe, event); default: return 0; } } /* Convert a var that points to common_pid.execname to a string */ static void update_var_execname(struct hist_field *hist_field) { hist_field->flags = HIST_FIELD_FL_STRING | HIST_FIELD_FL_VAR | HIST_FIELD_FL_EXECNAME; hist_field->size = MAX_FILTER_STR_VAL; hist_field->is_signed = 0; kfree_const(hist_field->type); hist_field->type = "char[]"; hist_field->fn_num = HIST_FIELD_FN_EXECNAME; } static int create_var_field(struct hist_trigger_data *hist_data, unsigned int val_idx, struct trace_event_file *file, char *var_name, char *expr_str) { struct trace_array *tr = hist_data->event_file->tr; unsigned long flags = 0; int ret; if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) return -EINVAL; if (find_var(hist_data, file, var_name) && !hist_data->remove) { hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name)); return -EINVAL; } flags |= HIST_FIELD_FL_VAR; hist_data->n_vars++; if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX)) return -EINVAL; ret = __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags); if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_EXECNAME) update_var_execname(hist_data->fields[val_idx]); if (!ret && hist_data->fields[val_idx]->flags & (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE)) hist_data->fields[val_idx]->var_str_idx = hist_data->n_var_str++; return ret; } static int create_val_fields(struct hist_trigger_data *hist_data, struct trace_event_file *file) { unsigned int i, j = 1, n_hitcount = 0; char *fields_str, *field_str; int ret; ret = create_hitcount_val(hist_data); if (ret) goto out; fields_str = hist_data->attrs->vals_str; if (!fields_str) goto out; for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX && j < TRACING_MAP_VALS_MAX; i++) { field_str = strsep(&fields_str, ","); if (!field_str) break; if (strcmp(field_str, "hitcount") == 0) { if (!n_hitcount++) continue; } ret = create_val_field(hist_data, j++, file, field_str); if (ret) goto out; } if (fields_str && (strcmp(fields_str, "hitcount") != 0)) ret = -EINVAL; out: /* There is only raw hitcount but nohitcount suppresses it. */ if (j == 1 && hist_data->attrs->no_hitcount) { hist_err(hist_data->event_file->tr, HIST_ERR_NEED_NOHC_VAL, 0); ret = -ENOENT; } return ret; } static int create_key_field(struct hist_trigger_data *hist_data, unsigned int key_idx, unsigned int key_offset, struct trace_event_file *file, char *field_str) { struct trace_array *tr = hist_data->event_file->tr; struct hist_field *hist_field = NULL; unsigned long flags = 0; unsigned int key_size; int ret = 0, n_subexprs = 0; if (WARN_ON(key_idx >= HIST_FIELDS_MAX)) return -EINVAL; flags |= HIST_FIELD_FL_KEY; if (strcmp(field_str, "stacktrace") == 0) { flags |= HIST_FIELD_FL_STACKTRACE; key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH; hist_field = create_hist_field(hist_data, NULL, flags, NULL); } else { hist_field = parse_expr(hist_data, file, field_str, flags, NULL, &n_subexprs); if (IS_ERR(hist_field)) { ret = PTR_ERR(hist_field); goto out; } if (field_has_hist_vars(hist_field, 0)) { hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str)); destroy_hist_field(hist_field, 0); ret = -EINVAL; goto out; } key_size = hist_field->size; } hist_data->fields[key_idx] = hist_field; key_size = ALIGN(key_size, sizeof(u64)); hist_data->fields[key_idx]->size = key_size; hist_data->fields[key_idx]->offset = key_offset; hist_data->key_size += key_size; if (hist_data->key_size > HIST_KEY_SIZE_MAX) { ret = -EINVAL; goto out; } hist_data->n_keys++; hist_data->n_fields++; if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX)) return -EINVAL; ret = key_size; out: return ret; } static int create_key_fields(struct hist_trigger_data *hist_data, struct trace_event_file *file) { unsigned int i, key_offset = 0, n_vals = hist_data->n_vals; char *fields_str, *field_str; int ret = -EINVAL; fields_str = hist_data->attrs->keys_str; if (!fields_str) goto out; for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) { field_str = strsep(&fields_str, ","); if (!field_str) break; ret = create_key_field(hist_data, i, key_offset, file, field_str); if (ret < 0) goto out; key_offset += ret; } if (fields_str) { ret = -EINVAL; goto out; } ret = 0; out: return ret; } static int create_var_fields(struct hist_trigger_data *hist_data, struct trace_event_file *file) { unsigned int i, j = hist_data->n_vals; int ret = 0; unsigned int n_vars = hist_data->attrs->var_defs.n_vars; for (i = 0; i < n_vars; i++) { char *var_name = hist_data->attrs->var_defs.name[i]; char *expr = hist_data->attrs->var_defs.expr[i]; ret = create_var_field(hist_data, j++, file, var_name, expr); if (ret) goto out; } out: return ret; } static void free_var_defs(struct hist_trigger_data *hist_data) { unsigned int i; for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { kfree(hist_data->attrs->var_defs.name[i]); kfree(hist_data->attrs->var_defs.expr[i]); } hist_data->attrs->var_defs.n_vars = 0; } static int parse_var_defs(struct hist_trigger_data *hist_data) { struct trace_array *tr = hist_data->event_file->tr; char *s, *str, *var_name, *field_str; unsigned int i, j, n_vars = 0; int ret = 0; for (i = 0; i < hist_data->attrs->n_assignments; i++) { str = hist_data->attrs->assignment_str[i]; for (j = 0; j < TRACING_MAP_VARS_MAX; j++) { field_str = strsep(&str, ","); if (!field_str) break; var_name = strsep(&field_str, "="); if (!var_name || !field_str) { hist_err(tr, HIST_ERR_MALFORMED_ASSIGNMENT, errpos(var_name)); ret = -EINVAL; goto free; } if (n_vars == TRACING_MAP_VARS_MAX) { hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name)); ret = -EINVAL; goto free; } s = kstrdup(var_name, GFP_KERNEL); if (!s) { ret = -ENOMEM; goto free; } hist_data->attrs->var_defs.name[n_vars] = s; s = kstrdup(field_str, GFP_KERNEL); if (!s) { kfree(hist_data->attrs->var_defs.name[n_vars]); hist_data->attrs->var_defs.name[n_vars] = NULL; ret = -ENOMEM; goto free; } hist_data->attrs->var_defs.expr[n_vars++] = s; hist_data->attrs->var_defs.n_vars = n_vars; } } return ret; free: free_var_defs(hist_data); return ret; } static int create_hist_fields(struct hist_trigger_data *hist_data, struct trace_event_file *file) { int ret; ret = parse_var_defs(hist_data); if (ret) return ret; ret = create_val_fields(hist_data, file); if (ret) goto out; ret = create_var_fields(hist_data, file); if (ret) goto out; ret = create_key_fields(hist_data, file); out: free_var_defs(hist_data); return ret; } static int is_descending(struct trace_array *tr, const char *str) { if (!str) return 0; if (strcmp(str, "descending") == 0) return 1; if (strcmp(str, "ascending") == 0) return 0; hist_err(tr, HIST_ERR_INVALID_SORT_MODIFIER, errpos((char *)str)); return -EINVAL; } static int create_sort_keys(struct hist_trigger_data *hist_data) { struct trace_array *tr = hist_data->event_file->tr; char *fields_str = hist_data->attrs->sort_key_str; struct tracing_map_sort_key *sort_key; int descending, ret = 0; unsigned int i, j, k; hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */ if (!fields_str) goto out; for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) { struct hist_field *hist_field; char *field_str, *field_name; const char *test_name; sort_key = &hist_data->sort_keys[i]; field_str = strsep(&fields_str, ","); if (!field_str) break; if (!*field_str) { ret = -EINVAL; hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort=")); break; } if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) { hist_err(tr, HIST_ERR_TOO_MANY_SORT_FIELDS, errpos("sort=")); ret = -EINVAL; break; } field_name = strsep(&field_str, "."); if (!field_name || !*field_name) { ret = -EINVAL; hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort=")); break; } if (strcmp(field_name, "hitcount") == 0) { descending = is_descending(tr, field_str); if (descending < 0) { ret = descending; break; } sort_key->descending = descending; continue; } for (j = 1, k = 1; j < hist_data->n_fields; j++) { unsigned int idx; hist_field = hist_data->fields[j]; if (hist_field->flags & HIST_FIELD_FL_VAR) continue; idx = k++; test_name = hist_field_name(hist_field, 0); if (strcmp(field_name, test_name) == 0) { sort_key->field_idx = idx; descending = is_descending(tr, field_str); if (descending < 0) { ret = descending; goto out; } sort_key->descending = descending; break; } } if (j == hist_data->n_fields) { ret = -EINVAL; hist_err(tr, HIST_ERR_INVALID_SORT_FIELD, errpos(field_name)); break; } } hist_data->n_sort_keys = i; out: return ret; } static void destroy_actions(struct hist_trigger_data *hist_data) { unsigned int i; for (i = 0; i < hist_data->n_actions; i++) { struct action_data *data = hist_data->actions[i]; if (data->handler == HANDLER_ONMATCH) onmatch_destroy(data); else if (data->handler == HANDLER_ONMAX || data->handler == HANDLER_ONCHANGE) track_data_destroy(hist_data, data); else kfree(data); } } static int parse_actions(struct hist_trigger_data *hist_data) { struct trace_array *tr = hist_data->event_file->tr; struct action_data *data; unsigned int i; int ret = 0; char *str; int len; for (i = 0; i < hist_data->attrs->n_actions; i++) { enum handler_id hid = 0; char *action_str; str = hist_data->attrs->action_str[i]; if ((len = str_has_prefix(str, "onmatch("))) hid = HANDLER_ONMATCH; else if ((len = str_has_prefix(str, "onmax("))) hid = HANDLER_ONMAX; else if ((len = str_has_prefix(str, "onchange("))) hid = HANDLER_ONCHANGE; action_str = str + len; switch (hid) { case HANDLER_ONMATCH: data = onmatch_parse(tr, action_str); break; case HANDLER_ONMAX: case HANDLER_ONCHANGE: data = track_data_parse(hist_data, action_str, hid); break; default: data = ERR_PTR(-EINVAL); break; } if (IS_ERR(data)) { ret = PTR_ERR(data); break; } hist_data->actions[hist_data->n_actions++] = data; } return ret; } static int create_actions(struct hist_trigger_data *hist_data) { struct action_data *data; unsigned int i; int ret = 0; for (i = 0; i < hist_data->attrs->n_actions; i++) { data = hist_data->actions[i]; if (data->handler == HANDLER_ONMATCH) { ret = onmatch_create(hist_data, data); if (ret) break; } else if (data->handler == HANDLER_ONMAX || data->handler == HANDLER_ONCHANGE) { ret = track_data_create(hist_data, data); if (ret) break; } else { ret = -EINVAL; break; } } return ret; } static void print_actions(struct seq_file *m, struct hist_trigger_data *hist_data, struct tracing_map_elt *elt) { unsigned int i; for (i = 0; i < hist_data->n_actions; i++) { struct action_data *data = hist_data->actions[i]; if (data->action == ACTION_SNAPSHOT) continue; if (data->handler == HANDLER_ONMAX || data->handler == HANDLER_ONCHANGE) track_data_print(m, hist_data, elt, data); } } static void print_action_spec(struct seq_file *m, struct hist_trigger_data *hist_data, struct action_data *data) { unsigned int i; if (data->action == ACTION_SAVE) { for (i = 0; i < hist_data->n_save_vars; i++) { seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name); if (i < hist_data->n_save_vars - 1) seq_puts(m, ","); } } else if (data->action == ACTION_TRACE) { if (data->use_trace_keyword) seq_printf(m, "%s", data->synth_event_name); for (i = 0; i < data->n_params; i++) { if (i || data->use_trace_keyword) seq_puts(m, ","); seq_printf(m, "%s", data->params[i]); } } } static void print_track_data_spec(struct seq_file *m, struct hist_trigger_data *hist_data, struct action_data *data) { if (data->handler == HANDLER_ONMAX) seq_puts(m, ":onmax("); else if (data->handler == HANDLER_ONCHANGE) seq_puts(m, ":onchange("); seq_printf(m, "%s", data->track_data.var_str); seq_printf(m, ").%s(", data->action_name); print_action_spec(m, hist_data, data); seq_puts(m, ")"); } static void print_onmatch_spec(struct seq_file *m, struct hist_trigger_data *hist_data, struct action_data *data) { seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system, data->match_data.event); seq_printf(m, "%s(", data->action_name); print_action_spec(m, hist_data, data); seq_puts(m, ")"); } static bool actions_match(struct hist_trigger_data *hist_data, struct hist_trigger_data *hist_data_test) { unsigned int i, j; if (hist_data->n_actions != hist_data_test->n_actions) return false; for (i = 0; i < hist_data->n_actions; i++) { struct action_data *data = hist_data->actions[i]; struct action_data *data_test = hist_data_test->actions[i]; char *action_name, *action_name_test; if (data->handler != data_test->handler) return false; if (data->action != data_test->action) return false; if (data->n_params != data_test->n_params) return false; for (j = 0; j < data->n_params; j++) { if (strcmp(data->params[j], data_test->params[j]) != 0) return false; } if (data->use_trace_keyword) action_name = data->synth_event_name; else action_name = data->action_name; if (data_test->use_trace_keyword) action_name_test = data_test->synth_event_name; else action_name_test = data_test->action_name; if (strcmp(action_name, action_name_test) != 0) return false; if (data->handler == HANDLER_ONMATCH) { if (strcmp(data->match_data.event_system, data_test->match_data.event_system) != 0) return false; if (strcmp(data->match_data.event, data_test->match_data.event) != 0) return false; } else if (data->handler == HANDLER_ONMAX || data->handler == HANDLER_ONCHANGE) { if (strcmp(data->track_data.var_str, data_test->track_data.var_str) != 0) return false; } } return true; } static void print_actions_spec(struct seq_file *m, struct hist_trigger_data *hist_data) { unsigned int i; for (i = 0; i < hist_data->n_actions; i++) { struct action_data *data = hist_data->actions[i]; if (data->handler == HANDLER_ONMATCH) print_onmatch_spec(m, hist_data, data); else if (data->handler == HANDLER_ONMAX || data->handler == HANDLER_ONCHANGE) print_track_data_spec(m, hist_data, data); } } static void destroy_field_var_hists(struct hist_trigger_data *hist_data) { unsigned int i; for (i = 0; i < hist_data->n_field_var_hists; i++) { kfree(hist_data->field_var_hists[i]->cmd); kfree(hist_data->field_var_hists[i]); } } static void destroy_hist_data(struct hist_trigger_data *hist_data) { if (!hist_data) return; destroy_hist_trigger_attrs(hist_data->attrs); destroy_hist_fields(hist_data); tracing_map_destroy(hist_data->map); destroy_actions(hist_data); destroy_field_vars(hist_data); destroy_field_var_hists(hist_data); kfree(hist_data); } static int create_tracing_map_fields(struct hist_trigger_data *hist_data) { struct tracing_map *map = hist_data->map; struct ftrace_event_field *field; struct hist_field *hist_field; int i, idx = 0; for_each_hist_field(i, hist_data) { hist_field = hist_data->fields[i]; if (hist_field->flags & HIST_FIELD_FL_KEY) { tracing_map_cmp_fn_t cmp_fn; field = hist_field->field; if (hist_field->flags & HIST_FIELD_FL_STACKTRACE) cmp_fn = tracing_map_cmp_none; else if (!field || hist_field->flags & HIST_FIELD_FL_CPU) cmp_fn = tracing_map_cmp_num(hist_field->size, hist_field->is_signed); else if (is_string_field(field)) cmp_fn = tracing_map_cmp_string; else cmp_fn = tracing_map_cmp_num(field->size, field->is_signed); idx = tracing_map_add_key_field(map, hist_field->offset, cmp_fn); } else if (!(hist_field->flags & HIST_FIELD_FL_VAR)) idx = tracing_map_add_sum_field(map); if (idx < 0) return idx; if (hist_field->flags & HIST_FIELD_FL_VAR) { idx = tracing_map_add_var(map); if (idx < 0) return idx; hist_field->var.idx = idx; hist_field->var.hist_data = hist_data; } } return 0; } static struct hist_trigger_data * create_hist_data(unsigned int map_bits, struct hist_trigger_attrs *attrs, struct trace_event_file *file, bool remove) { const struct tracing_map_ops *map_ops = NULL; struct hist_trigger_data *hist_data; int ret = 0; hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL); if (!hist_data) return ERR_PTR(-ENOMEM); hist_data->attrs = attrs; hist_data->remove = remove; hist_data->event_file = file; ret = parse_actions(hist_data); if (ret) goto free; ret = create_hist_fields(hist_data, file); if (ret) goto free; ret = create_sort_keys(hist_data); if (ret) goto free; map_ops = &hist_trigger_elt_data_ops; hist_data->map = tracing_map_create(map_bits, hist_data->key_size, map_ops, hist_data); if (IS_ERR(hist_data->map)) { ret = PTR_ERR(hist_data->map); hist_data->map = NULL; goto free; } ret = create_tracing_map_fields(hist_data); if (ret) goto free; out: return hist_data; free: hist_data->attrs = NULL; destroy_hist_data(hist_data); hist_data = ERR_PTR(ret); goto out; } static void hist_trigger_elt_update(struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *rbe, u64 *var_ref_vals) { struct hist_elt_data *elt_data; struct hist_field *hist_field; unsigned int i, var_idx; u64 hist_val; elt_data = elt->private_data; elt_data->var_ref_vals = var_ref_vals; for_each_hist_val_field(i, hist_data) { hist_field = hist_data->fields[i]; hist_val = hist_fn_call(hist_field, elt, buffer, rbe, rec); if (hist_field->flags & HIST_FIELD_FL_VAR) { var_idx = hist_field->var.idx; if (hist_field->flags & (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE)) { unsigned int str_start, var_str_idx, idx; char *str, *val_str; unsigned int size; str_start = hist_data->n_field_var_str + hist_data->n_save_var_str; var_str_idx = hist_field->var_str_idx; idx = str_start + var_str_idx; str = elt_data->field_var_str[idx]; val_str = (char *)(uintptr_t)hist_val; if (hist_field->flags & HIST_FIELD_FL_STRING) { size = min(hist_field->size, STR_VAR_LEN_MAX); strscpy(str, val_str, size); } else { char *stack_start = str + sizeof(unsigned long); int e; e = stack_trace_save((void *)stack_start, HIST_STACKTRACE_DEPTH, HIST_STACKTRACE_SKIP); if (e < HIST_STACKTRACE_DEPTH - 1) ((unsigned long *)stack_start)[e] = 0; *((unsigned long *)str) = e; } hist_val = (u64)(uintptr_t)str; } tracing_map_set_var(elt, var_idx, hist_val); continue; } tracing_map_update_sum(elt, i, hist_val); } for_each_hist_key_field(i, hist_data) { hist_field = hist_data->fields[i]; if (hist_field->flags & HIST_FIELD_FL_VAR) { hist_val = hist_fn_call(hist_field, elt, buffer, rbe, rec); var_idx = hist_field->var.idx; tracing_map_set_var(elt, var_idx, hist_val); } } update_field_vars(hist_data, elt, buffer, rbe, rec); } static inline void add_to_key(char *compound_key, void *key, struct hist_field *key_field, void *rec) { size_t size = key_field->size; if (key_field->flags & HIST_FIELD_FL_STRING) { struct ftrace_event_field *field; field = key_field->field; if (field->filter_type == FILTER_DYN_STRING || field->filter_type == FILTER_RDYN_STRING) size = *(u32 *)(rec + field->offset) >> 16; else if (field->filter_type == FILTER_STATIC_STRING) size = field->size; /* ensure NULL-termination */ if (size > key_field->size - 1) size = key_field->size - 1; strncpy(compound_key + key_field->offset, (char *)key, size); } else memcpy(compound_key + key_field->offset, key, size); } static void hist_trigger_actions(struct hist_trigger_data *hist_data, struct tracing_map_elt *elt, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *rbe, void *key, u64 *var_ref_vals) { struct action_data *data; unsigned int i; for (i = 0; i < hist_data->n_actions; i++) { data = hist_data->actions[i]; data->fn(hist_data, elt, buffer, rec, rbe, key, data, var_ref_vals); } } static void event_hist_trigger(struct event_trigger_data *data, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *rbe) { struct hist_trigger_data *hist_data = data->private_data; bool use_compound_key = (hist_data->n_keys > 1); unsigned long entries[HIST_STACKTRACE_DEPTH]; u64 var_ref_vals[TRACING_MAP_VARS_MAX]; char compound_key[HIST_KEY_SIZE_MAX]; struct tracing_map_elt *elt = NULL; struct hist_field *key_field; u64 field_contents; void *key = NULL; unsigned int i; if (unlikely(!rbe)) return; memset(compound_key, 0, hist_data->key_size); for_each_hist_key_field(i, hist_data) { key_field = hist_data->fields[i]; if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { memset(entries, 0, HIST_STACKTRACE_SIZE); if (key_field->field) { unsigned long *stack, n_entries; field_contents = hist_fn_call(key_field, elt, buffer, rbe, rec); stack = (unsigned long *)(long)field_contents; n_entries = *stack; memcpy(entries, ++stack, n_entries * sizeof(unsigned long)); } else { stack_trace_save(entries, HIST_STACKTRACE_DEPTH, HIST_STACKTRACE_SKIP); } key = entries; } else { field_contents = hist_fn_call(key_field, elt, buffer, rbe, rec); if (key_field->flags & HIST_FIELD_FL_STRING) { key = (void *)(unsigned long)field_contents; use_compound_key = true; } else key = (void *)&field_contents; } if (use_compound_key) add_to_key(compound_key, key, key_field, rec); } if (use_compound_key) key = compound_key; if (hist_data->n_var_refs && !resolve_var_refs(hist_data, key, var_ref_vals, false)) return; elt = tracing_map_insert(hist_data->map, key); if (!elt) return; hist_trigger_elt_update(hist_data, elt, buffer, rec, rbe, var_ref_vals); if (resolve_var_refs(hist_data, key, var_ref_vals, true)) hist_trigger_actions(hist_data, elt, buffer, rec, rbe, key, var_ref_vals); } static void hist_trigger_stacktrace_print(struct seq_file *m, unsigned long *stacktrace_entries, unsigned int max_entries) { unsigned int spaces = 8; unsigned int i; for (i = 0; i < max_entries; i++) { if (!stacktrace_entries[i]) return; seq_printf(m, "%*c", 1 + spaces, ' '); seq_printf(m, "%pS\n", (void*)stacktrace_entries[i]); } } static void hist_trigger_print_key(struct seq_file *m, struct hist_trigger_data *hist_data, void *key, struct tracing_map_elt *elt) { struct hist_field *key_field; bool multiline = false; const char *field_name; unsigned int i; u64 uval; seq_puts(m, "{ "); for_each_hist_key_field(i, hist_data) { key_field = hist_data->fields[i]; if (i > hist_data->n_vals) seq_puts(m, ", "); field_name = hist_field_name(key_field, 0); if (key_field->flags & HIST_FIELD_FL_HEX) { uval = *(u64 *)(key + key_field->offset); seq_printf(m, "%s: %llx", field_name, uval); } else if (key_field->flags & HIST_FIELD_FL_SYM) { uval = *(u64 *)(key + key_field->offset); seq_printf(m, "%s: [%llx] %-45ps", field_name, uval, (void *)(uintptr_t)uval); } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) { uval = *(u64 *)(key + key_field->offset); seq_printf(m, "%s: [%llx] %-55pS", field_name, uval, (void *)(uintptr_t)uval); } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) { struct hist_elt_data *elt_data = elt->private_data; char *comm; if (WARN_ON_ONCE(!elt_data)) return; comm = elt_data->comm; uval = *(u64 *)(key + key_field->offset); seq_printf(m, "%s: %-16s[%10llu]", field_name, comm, uval); } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) { const char *syscall_name; uval = *(u64 *)(key + key_field->offset); syscall_name = get_syscall_name(uval); if (!syscall_name) syscall_name = "unknown_syscall"; seq_printf(m, "%s: %-30s[%3llu]", field_name, syscall_name, uval); } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { if (key_field->field) seq_printf(m, "%s.stacktrace", key_field->field->name); else seq_puts(m, "common_stacktrace:\n"); hist_trigger_stacktrace_print(m, key + key_field->offset, HIST_STACKTRACE_DEPTH); multiline = true; } else if (key_field->flags & HIST_FIELD_FL_LOG2) { seq_printf(m, "%s: ~ 2^%-2llu", field_name, *(u64 *)(key + key_field->offset)); } else if (key_field->flags & HIST_FIELD_FL_BUCKET) { unsigned long buckets = key_field->buckets; uval = *(u64 *)(key + key_field->offset); seq_printf(m, "%s: ~ %llu-%llu", field_name, uval, uval + buckets -1); } else if (key_field->flags & HIST_FIELD_FL_STRING) { seq_printf(m, "%s: %-50s", field_name, (char *)(key + key_field->offset)); } else { uval = *(u64 *)(key + key_field->offset); seq_printf(m, "%s: %10llu", field_name, uval); } } if (!multiline) seq_puts(m, " "); seq_puts(m, "}"); } /* Get the 100 times of the percentage of @val in @total */ static inline unsigned int __get_percentage(u64 val, u64 total) { if (!total) goto div0; if (val < (U64_MAX / 10000)) return (unsigned int)div64_ul(val * 10000, total); total = div64_u64(total, 10000); if (!total) goto div0; return (unsigned int)div64_ul(val, total); div0: return val ? UINT_MAX : 0; } #define BAR_CHAR '#' static inline const char *__fill_bar_str(char *buf, int size, u64 val, u64 max) { unsigned int len = __get_percentage(val, max); int i; if (len == UINT_MAX) { snprintf(buf, size, "[ERROR]"); return buf; } len = len * size / 10000; for (i = 0; i < len && i < size; i++) buf[i] = BAR_CHAR; while (i < size) buf[i++] = ' '; buf[size] = '\0'; return buf; } struct hist_val_stat { u64 max; u64 total; }; static void hist_trigger_print_val(struct seq_file *m, unsigned int idx, const char *field_name, unsigned long flags, struct hist_val_stat *stats, struct tracing_map_elt *elt) { u64 val = tracing_map_read_sum(elt, idx); unsigned int pc; char bar[21]; if (flags & HIST_FIELD_FL_PERCENT) { pc = __get_percentage(val, stats[idx].total); if (pc == UINT_MAX) seq_printf(m, " %s (%%):[ERROR]", field_name); else seq_printf(m, " %s (%%): %3u.%02u", field_name, pc / 100, pc % 100); } else if (flags & HIST_FIELD_FL_GRAPH) { seq_printf(m, " %s: %20s", field_name, __fill_bar_str(bar, 20, val, stats[idx].max)); } else if (flags & HIST_FIELD_FL_HEX) { seq_printf(m, " %s: %10llx", field_name, val); } else { seq_printf(m, " %s: %10llu", field_name, val); } } static void hist_trigger_entry_print(struct seq_file *m, struct hist_trigger_data *hist_data, struct hist_val_stat *stats, void *key, struct tracing_map_elt *elt) { const char *field_name; unsigned int i = HITCOUNT_IDX; unsigned long flags; hist_trigger_print_key(m, hist_data, key, elt); /* At first, show the raw hitcount if !nohitcount */ if (!hist_data->attrs->no_hitcount) hist_trigger_print_val(m, i, "hitcount", 0, stats, elt); for (i = 1; i < hist_data->n_vals; i++) { field_name = hist_field_name(hist_data->fields[i], 0); flags = hist_data->fields[i]->flags; if (flags & HIST_FIELD_FL_VAR || flags & HIST_FIELD_FL_EXPR) continue; seq_puts(m, " "); hist_trigger_print_val(m, i, field_name, flags, stats, elt); } print_actions(m, hist_data, elt); seq_puts(m, "\n"); } static int print_entries(struct seq_file *m, struct hist_trigger_data *hist_data) { struct tracing_map_sort_entry **sort_entries = NULL; struct tracing_map *map = hist_data->map; int i, j, n_entries; struct hist_val_stat *stats = NULL; u64 val; n_entries = tracing_map_sort_entries(map, hist_data->sort_keys, hist_data->n_sort_keys, &sort_entries); if (n_entries < 0) return n_entries; /* Calculate the max and the total for each field if needed. */ for (j = 0; j < hist_data->n_vals; j++) { if (!(hist_data->fields[j]->flags & (HIST_FIELD_FL_PERCENT | HIST_FIELD_FL_GRAPH))) continue; if (!stats) { stats = kcalloc(hist_data->n_vals, sizeof(*stats), GFP_KERNEL); if (!stats) { n_entries = -ENOMEM; goto out; } } for (i = 0; i < n_entries; i++) { val = tracing_map_read_sum(sort_entries[i]->elt, j); stats[j].total += val; if (stats[j].max < val) stats[j].max = val; } } for (i = 0; i < n_entries; i++) hist_trigger_entry_print(m, hist_data, stats, sort_entries[i]->key, sort_entries[i]->elt); kfree(stats); out: tracing_map_destroy_sort_entries(sort_entries, n_entries); return n_entries; } static void hist_trigger_show(struct seq_file *m, struct event_trigger_data *data, int n) { struct hist_trigger_data *hist_data; int n_entries; if (n > 0) seq_puts(m, "\n\n"); seq_puts(m, "# event histogram\n#\n# trigger info: "); data->ops->print(m, data); seq_puts(m, "#\n\n"); hist_data = data->private_data; n_entries = print_entries(m, hist_data); if (n_entries < 0) n_entries = 0; track_data_snapshot_print(m, hist_data); seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n", (u64)atomic64_read(&hist_data->map->hits), n_entries, (u64)atomic64_read(&hist_data->map->drops)); } static int hist_show(struct seq_file *m, void *v) { struct event_trigger_data *data; struct trace_event_file *event_file; int n = 0, ret = 0; mutex_lock(&event_mutex); event_file = event_file_file(m->private); if (unlikely(!event_file)) { ret = -ENODEV; goto out_unlock; } list_for_each_entry(data, &event_file->triggers, list) { if (data->cmd_ops->trigger_type == ETT_EVENT_HIST) hist_trigger_show(m, data, n++); } out_unlock: mutex_unlock(&event_mutex); return ret; } static int event_hist_open(struct inode *inode, struct file *file) { int ret; ret = tracing_open_file_tr(inode, file); if (ret) return ret; /* Clear private_data to avoid warning in single_open() */ file->private_data = NULL; return single_open(file, hist_show, file); } const struct file_operations event_hist_fops = { .open = event_hist_open, .read = seq_read, .llseek = seq_lseek, .release = tracing_single_release_file_tr, }; #ifdef CONFIG_HIST_TRIGGERS_DEBUG static void hist_field_debug_show_flags(struct seq_file *m, unsigned long flags) { seq_puts(m, " flags:\n"); if (flags & HIST_FIELD_FL_KEY) seq_puts(m, " HIST_FIELD_FL_KEY\n"); else if (flags & HIST_FIELD_FL_HITCOUNT) seq_puts(m, " VAL: HIST_FIELD_FL_HITCOUNT\n"); else if (flags & HIST_FIELD_FL_VAR) seq_puts(m, " HIST_FIELD_FL_VAR\n"); else if (flags & HIST_FIELD_FL_VAR_REF) seq_puts(m, " HIST_FIELD_FL_VAR_REF\n"); else seq_puts(m, " VAL: normal u64 value\n"); if (flags & HIST_FIELD_FL_ALIAS) seq_puts(m, " HIST_FIELD_FL_ALIAS\n"); else if (flags & HIST_FIELD_FL_CONST) seq_puts(m, " HIST_FIELD_FL_CONST\n"); } static int hist_field_debug_show(struct seq_file *m, struct hist_field *field, unsigned long flags) { if ((field->flags & flags) != flags) { seq_printf(m, "ERROR: bad flags - %lx\n", flags); return -EINVAL; } hist_field_debug_show_flags(m, field->flags); if (field->field) seq_printf(m, " ftrace_event_field name: %s\n", field->field->name); if (field->flags & HIST_FIELD_FL_VAR) { seq_printf(m, " var.name: %s\n", field->var.name); seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n", field->var.idx); } if (field->flags & HIST_FIELD_FL_CONST) seq_printf(m, " constant: %llu\n", field->constant); if (field->flags & HIST_FIELD_FL_ALIAS) seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n", field->var_ref_idx); if (field->flags & HIST_FIELD_FL_VAR_REF) { seq_printf(m, " name: %s\n", field->name); seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n", field->var.idx); seq_printf(m, " var.hist_data: %p\n", field->var.hist_data); seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n", field->var_ref_idx); if (field->system) seq_printf(m, " system: %s\n", field->system); if (field->event_name) seq_printf(m, " event_name: %s\n", field->event_name); } seq_printf(m, " type: %s\n", field->type); seq_printf(m, " size: %u\n", field->size); seq_printf(m, " is_signed: %u\n", field->is_signed); return 0; } static int field_var_debug_show(struct seq_file *m, struct field_var *field_var, unsigned int i, bool save_vars) { const char *vars_name = save_vars ? "save_vars" : "field_vars"; struct hist_field *field; int ret = 0; seq_printf(m, "\n hist_data->%s[%d]:\n", vars_name, i); field = field_var->var; seq_printf(m, "\n %s[%d].var:\n", vars_name, i); hist_field_debug_show_flags(m, field->flags); seq_printf(m, " var.name: %s\n", field->var.name); seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n", field->var.idx); field = field_var->val; seq_printf(m, "\n %s[%d].val:\n", vars_name, i); if (field->field) seq_printf(m, " ftrace_event_field name: %s\n", field->field->name); else { ret = -EINVAL; goto out; } seq_printf(m, " type: %s\n", field->type); seq_printf(m, " size: %u\n", field->size); seq_printf(m, " is_signed: %u\n", field->is_signed); out: return ret; } static int hist_action_debug_show(struct seq_file *m, struct action_data *data, int i) { int ret = 0; if (data->handler == HANDLER_ONMAX || data->handler == HANDLER_ONCHANGE) { seq_printf(m, "\n hist_data->actions[%d].track_data.var_ref:\n", i); ret = hist_field_debug_show(m, data->track_data.var_ref, HIST_FIELD_FL_VAR_REF); if (ret) goto out; seq_printf(m, "\n hist_data->actions[%d].track_data.track_var:\n", i); ret = hist_field_debug_show(m, data->track_data.track_var, HIST_FIELD_FL_VAR); if (ret) goto out; } if (data->handler == HANDLER_ONMATCH) { seq_printf(m, "\n hist_data->actions[%d].match_data.event_system: %s\n", i, data->match_data.event_system); seq_printf(m, " hist_data->actions[%d].match_data.event: %s\n", i, data->match_data.event); } out: return ret; } static int hist_actions_debug_show(struct seq_file *m, struct hist_trigger_data *hist_data) { int i, ret = 0; if (hist_data->n_actions) seq_puts(m, "\n action tracking variables (for onmax()/onchange()/onmatch()):\n"); for (i = 0; i < hist_data->n_actions; i++) { struct action_data *action = hist_data->actions[i]; ret = hist_action_debug_show(m, action, i); if (ret) goto out; } if (hist_data->n_save_vars) seq_puts(m, "\n save action variables (save() params):\n"); for (i = 0; i < hist_data->n_save_vars; i++) { ret = field_var_debug_show(m, hist_data->save_vars[i], i, true); if (ret) goto out; } out: return ret; } static void hist_trigger_debug_show(struct seq_file *m, struct event_trigger_data *data, int n) { struct hist_trigger_data *hist_data; int i, ret; if (n > 0) seq_puts(m, "\n\n"); seq_puts(m, "# event histogram\n#\n# trigger info: "); data->ops->print(m, data); seq_puts(m, "#\n\n"); hist_data = data->private_data; seq_printf(m, "hist_data: %p\n\n", hist_data); seq_printf(m, " n_vals: %u\n", hist_data->n_vals); seq_printf(m, " n_keys: %u\n", hist_data->n_keys); seq_printf(m, " n_fields: %u\n", hist_data->n_fields); seq_puts(m, "\n val fields:\n\n"); seq_puts(m, " hist_data->fields[0]:\n"); ret = hist_field_debug_show(m, hist_data->fields[0], HIST_FIELD_FL_HITCOUNT); if (ret) return; for (i = 1; i < hist_data->n_vals; i++) { seq_printf(m, "\n hist_data->fields[%d]:\n", i); ret = hist_field_debug_show(m, hist_data->fields[i], 0); if (ret) return; } seq_puts(m, "\n key fields:\n"); for (i = hist_data->n_vals; i < hist_data->n_fields; i++) { seq_printf(m, "\n hist_data->fields[%d]:\n", i); ret = hist_field_debug_show(m, hist_data->fields[i], HIST_FIELD_FL_KEY); if (ret) return; } if (hist_data->n_var_refs) seq_puts(m, "\n variable reference fields:\n"); for (i = 0; i < hist_data->n_var_refs; i++) { seq_printf(m, "\n hist_data->var_refs[%d]:\n", i); ret = hist_field_debug_show(m, hist_data->var_refs[i], HIST_FIELD_FL_VAR_REF); if (ret) return; } if (hist_data->n_field_vars) seq_puts(m, "\n field variables:\n"); for (i = 0; i < hist_data->n_field_vars; i++) { ret = field_var_debug_show(m, hist_data->field_vars[i], i, false); if (ret) return; } ret = hist_actions_debug_show(m, hist_data); if (ret) return; } static int hist_debug_show(struct seq_file *m, void *v) { struct event_trigger_data *data; struct trace_event_file *event_file; int n = 0, ret = 0; mutex_lock(&event_mutex); event_file = event_file_file(m->private); if (unlikely(!event_file)) { ret = -ENODEV; goto out_unlock; } list_for_each_entry(data, &event_file->triggers, list) { if (data->cmd_ops->trigger_type == ETT_EVENT_HIST) hist_trigger_debug_show(m, data, n++); } out_unlock: mutex_unlock(&event_mutex); return ret; } static int event_hist_debug_open(struct inode *inode, struct file *file) { int ret; ret = tracing_open_file_tr(inode, file); if (ret) return ret; /* Clear private_data to avoid warning in single_open() */ file->private_data = NULL; return single_open(file, hist_debug_show, file); } const struct file_operations event_hist_debug_fops = { .open = event_hist_debug_open, .read = seq_read, .llseek = seq_lseek, .release = tracing_single_release_file_tr, }; #endif static void hist_field_print(struct seq_file *m, struct hist_field *hist_field) { const char *field_name = hist_field_name(hist_field, 0); if (hist_field->var.name) seq_printf(m, "%s=", hist_field->var.name); if (hist_field->flags & HIST_FIELD_FL_CPU) seq_puts(m, "common_cpu"); else if (hist_field->flags & HIST_FIELD_FL_CONST) seq_printf(m, "%llu", hist_field->constant); else if (field_name) { if (hist_field->flags & HIST_FIELD_FL_VAR_REF || hist_field->flags & HIST_FIELD_FL_ALIAS) seq_putc(m, '$'); seq_printf(m, "%s", field_name); } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP) seq_puts(m, "common_timestamp"); if (hist_field->flags) { if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) && !(hist_field->flags & HIST_FIELD_FL_EXPR) && !(hist_field->flags & HIST_FIELD_FL_STACKTRACE)) { const char *flags = get_hist_field_flags(hist_field); if (flags) seq_printf(m, ".%s", flags); } } if (hist_field->buckets) seq_printf(m, "=%ld", hist_field->buckets); } static int event_hist_trigger_print(struct seq_file *m, struct event_trigger_data *data) { struct hist_trigger_data *hist_data = data->private_data; struct hist_field *field; bool have_var = false; bool show_val = false; unsigned int i; seq_puts(m, HIST_PREFIX); if (data->name) seq_printf(m, "%s:", data->name); seq_puts(m, "keys="); for_each_hist_key_field(i, hist_data) { field = hist_data->fields[i]; if (i > hist_data->n_vals) seq_puts(m, ","); if (field->flags & HIST_FIELD_FL_STACKTRACE) { if (field->field) seq_printf(m, "%s.stacktrace", field->field->name); else seq_puts(m, "common_stacktrace"); } else hist_field_print(m, field); } seq_puts(m, ":vals="); for_each_hist_val_field(i, hist_data) { field = hist_data->fields[i]; if (field->flags & HIST_FIELD_FL_VAR) { have_var = true; continue; } if (i == HITCOUNT_IDX) { if (hist_data->attrs->no_hitcount) continue; seq_puts(m, "hitcount"); } else { if (show_val) seq_puts(m, ","); hist_field_print(m, field); } show_val = true; } if (have_var) { unsigned int n = 0; seq_puts(m, ":"); for_each_hist_val_field(i, hist_data) { field = hist_data->fields[i]; if (field->flags & HIST_FIELD_FL_VAR) { if (n++) seq_puts(m, ","); hist_field_print(m, field); } } } seq_puts(m, ":sort="); for (i = 0; i < hist_data->n_sort_keys; i++) { struct tracing_map_sort_key *sort_key; unsigned int idx, first_key_idx; /* skip VAR vals */ first_key_idx = hist_data->n_vals - hist_data->n_vars; sort_key = &hist_data->sort_keys[i]; idx = sort_key->field_idx; if (WARN_ON(idx >= HIST_FIELDS_MAX)) return -EINVAL; if (i > 0) seq_puts(m, ","); if (idx == HITCOUNT_IDX) seq_puts(m, "hitcount"); else { if (idx >= first_key_idx) idx += hist_data->n_vars; hist_field_print(m, hist_data->fields[idx]); } if (sort_key->descending) seq_puts(m, ".descending"); } seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits)); if (hist_data->enable_timestamps) seq_printf(m, ":clock=%s", hist_data->attrs->clock); if (hist_data->attrs->no_hitcount) seq_puts(m, ":nohitcount"); print_actions_spec(m, hist_data); if (data->filter_str) seq_printf(m, " if %s", data->filter_str); if (data->paused) seq_puts(m, " [paused]"); else seq_puts(m, " [active]"); seq_putc(m, '\n'); return 0; } static int event_hist_trigger_init(struct event_trigger_data *data) { struct hist_trigger_data *hist_data = data->private_data; if (!data->ref && hist_data->attrs->name) save_named_trigger(hist_data->attrs->name, data); data->ref++; return 0; } static void unregister_field_var_hists(struct hist_trigger_data *hist_data) { struct trace_event_file *file; unsigned int i; char *cmd; int ret; for (i = 0; i < hist_data->n_field_var_hists; i++) { file = hist_data->field_var_hists[i]->hist_data->event_file; cmd = hist_data->field_var_hists[i]->cmd; ret = event_hist_trigger_parse(&trigger_hist_cmd, file, "!hist", "hist", cmd); WARN_ON_ONCE(ret < 0); } } static void event_hist_trigger_free(struct event_trigger_data *data) { struct hist_trigger_data *hist_data = data->private_data; if (WARN_ON_ONCE(data->ref <= 0)) return; data->ref--; if (!data->ref) { if (data->name) del_named_trigger(data); trigger_data_free(data); remove_hist_vars(hist_data); unregister_field_var_hists(hist_data); destroy_hist_data(hist_data); } } static struct event_trigger_ops event_hist_trigger_ops = { .trigger = event_hist_trigger, .print = event_hist_trigger_print, .init = event_hist_trigger_init, .free = event_hist_trigger_free, }; static int event_hist_trigger_named_init(struct event_trigger_data *data) { data->ref++; save_named_trigger(data->named_data->name, data); event_hist_trigger_init(data->named_data); return 0; } static void event_hist_trigger_named_free(struct event_trigger_data *data) { if (WARN_ON_ONCE(data->ref <= 0)) return; event_hist_trigger_free(data->named_data); data->ref--; if (!data->ref) { del_named_trigger(data); trigger_data_free(data); } } static struct event_trigger_ops event_hist_trigger_named_ops = { .trigger = event_hist_trigger, .print = event_hist_trigger_print, .init = event_hist_trigger_named_init, .free = event_hist_trigger_named_free, }; static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd, char *param) { return &event_hist_trigger_ops; } static void hist_clear(struct event_trigger_data *data) { struct hist_trigger_data *hist_data = data->private_data; if (data->name) pause_named_trigger(data); tracepoint_synchronize_unregister(); tracing_map_clear(hist_data->map); if (data->name) unpause_named_trigger(data); } static bool compatible_field(struct ftrace_event_field *field, struct ftrace_event_field *test_field) { if (field == test_field) return true; if (field == NULL || test_field == NULL) return false; if (strcmp(field->name, test_field->name) != 0) return false; if (strcmp(field->type, test_field->type) != 0) return false; if (field->size != test_field->size) return false; if (field->is_signed != test_field->is_signed) return false; return true; } static bool hist_trigger_match(struct event_trigger_data *data, struct event_trigger_data *data_test, struct event_trigger_data *named_data, bool ignore_filter) { struct tracing_map_sort_key *sort_key, *sort_key_test; struct hist_trigger_data *hist_data, *hist_data_test; struct hist_field *key_field, *key_field_test; unsigned int i; if (named_data && (named_data != data_test) && (named_data != data_test->named_data)) return false; if (!named_data && is_named_trigger(data_test)) return false; hist_data = data->private_data; hist_data_test = data_test->private_data; if (hist_data->n_vals != hist_data_test->n_vals || hist_data->n_fields != hist_data_test->n_fields || hist_data->n_sort_keys != hist_data_test->n_sort_keys) return false; if (!ignore_filter) { if ((data->filter_str && !data_test->filter_str) || (!data->filter_str && data_test->filter_str)) return false; } for_each_hist_field(i, hist_data) { key_field = hist_data->fields[i]; key_field_test = hist_data_test->fields[i]; if (key_field->flags != key_field_test->flags) return false; if (!compatible_field(key_field->field, key_field_test->field)) return false; if (key_field->offset != key_field_test->offset) return false; if (key_field->size != key_field_test->size) return false; if (key_field->is_signed != key_field_test->is_signed) return false; if (!!key_field->var.name != !!key_field_test->var.name) return false; if (key_field->var.name && strcmp(key_field->var.name, key_field_test->var.name) != 0) return false; } for (i = 0; i < hist_data->n_sort_keys; i++) { sort_key = &hist_data->sort_keys[i]; sort_key_test = &hist_data_test->sort_keys[i]; if (sort_key->field_idx != sort_key_test->field_idx || sort_key->descending != sort_key_test->descending) return false; } if (!ignore_filter && data->filter_str && (strcmp(data->filter_str, data_test->filter_str) != 0)) return false; if (!actions_match(hist_data, hist_data_test)) return false; return true; } static bool existing_hist_update_only(char *glob, struct event_trigger_data *data, struct trace_event_file *file) { struct hist_trigger_data *hist_data = data->private_data; struct event_trigger_data *test, *named_data = NULL; bool updated = false; if (!hist_data->attrs->pause && !hist_data->attrs->cont && !hist_data->attrs->clear) goto out; if (hist_data->attrs->name) { named_data = find_named_trigger(hist_data->attrs->name); if (named_data) { if (!hist_trigger_match(data, named_data, named_data, true)) goto out; } } if (hist_data->attrs->name && !named_data) goto out; list_for_each_entry(test, &file->triggers, list) { if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { if (!hist_trigger_match(data, test, named_data, false)) continue; if (hist_data->attrs->pause) test->paused = true; else if (hist_data->attrs->cont) test->paused = false; else if (hist_data->attrs->clear) hist_clear(test); updated = true; goto out; } } out: return updated; } static int hist_register_trigger(char *glob, struct event_trigger_data *data, struct trace_event_file *file) { struct hist_trigger_data *hist_data = data->private_data; struct event_trigger_data *test, *named_data = NULL; struct trace_array *tr = file->tr; int ret = 0; if (hist_data->attrs->name) { named_data = find_named_trigger(hist_data->attrs->name); if (named_data) { if (!hist_trigger_match(data, named_data, named_data, true)) { hist_err(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name)); ret = -EINVAL; goto out; } } } if (hist_data->attrs->name && !named_data) goto new; lockdep_assert_held(&event_mutex); list_for_each_entry(test, &file->triggers, list) { if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { if (hist_trigger_match(data, test, named_data, false)) { hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0); ret = -EEXIST; goto out; } } } new: if (hist_data->attrs->cont || hist_data->attrs->clear) { hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0); ret = -ENOENT; goto out; } if (hist_data->attrs->pause) data->paused = true; if (named_data) { data->private_data = named_data->private_data; set_named_trigger_data(data, named_data); data->ops = &event_hist_trigger_named_ops; } if (data->ops->init) { ret = data->ops->init(data); if (ret < 0) goto out; } if (hist_data->enable_timestamps) { char *clock = hist_data->attrs->clock; ret = tracing_set_clock(file->tr, hist_data->attrs->clock); if (ret) { hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock)); goto out; } tracing_set_filter_buffering(file->tr, true); } if (named_data) destroy_hist_data(hist_data); out: return ret; } static int hist_trigger_enable(struct event_trigger_data *data, struct trace_event_file *file) { int ret = 0; list_add_tail_rcu(&data->list, &file->triggers); update_cond_flag(file); if (trace_event_trigger_enable_disable(file, 1) < 0) { list_del_rcu(&data->list); update_cond_flag(file); ret--; } return ret; } static bool have_hist_trigger_match(struct event_trigger_data *data, struct trace_event_file *file) { struct hist_trigger_data *hist_data = data->private_data; struct event_trigger_data *test, *named_data = NULL; bool match = false; lockdep_assert_held(&event_mutex); if (hist_data->attrs->name) named_data = find_named_trigger(hist_data->attrs->name); list_for_each_entry(test, &file->triggers, list) { if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { if (hist_trigger_match(data, test, named_data, false)) { match = true; break; } } } return match; } static bool hist_trigger_check_refs(struct event_trigger_data *data, struct trace_event_file *file) { struct hist_trigger_data *hist_data = data->private_data; struct event_trigger_data *test, *named_data = NULL; lockdep_assert_held(&event_mutex); if (hist_data->attrs->name) named_data = find_named_trigger(hist_data->attrs->name); list_for_each_entry(test, &file->triggers, list) { if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { if (!hist_trigger_match(data, test, named_data, false)) continue; hist_data = test->private_data; if (check_var_refs(hist_data)) return true; break; } } return false; } static void hist_unregister_trigger(char *glob, struct event_trigger_data *data, struct trace_event_file *file) { struct event_trigger_data *test = NULL, *iter, *named_data = NULL; struct hist_trigger_data *hist_data = data->private_data; lockdep_assert_held(&event_mutex); if (hist_data->attrs->name) named_data = find_named_trigger(hist_data->attrs->name); list_for_each_entry(iter, &file->triggers, list) { if (iter->cmd_ops->trigger_type == ETT_EVENT_HIST) { if (!hist_trigger_match(data, iter, named_data, false)) continue; test = iter; list_del_rcu(&test->list); trace_event_trigger_enable_disable(file, 0); update_cond_flag(file); break; } } if (test && test->ops->free) test->ops->free(test); if (hist_data->enable_timestamps) { if (!hist_data->remove || test) tracing_set_filter_buffering(file->tr, false); } } static bool hist_file_check_refs(struct trace_event_file *file) { struct hist_trigger_data *hist_data; struct event_trigger_data *test; lockdep_assert_held(&event_mutex); list_for_each_entry(test, &file->triggers, list) { if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { hist_data = test->private_data; if (check_var_refs(hist_data)) return true; } } return false; } static void hist_unreg_all(struct trace_event_file *file) { struct event_trigger_data *test, *n; struct hist_trigger_data *hist_data; struct synth_event *se; const char *se_name; lockdep_assert_held(&event_mutex); if (hist_file_check_refs(file)) return; list_for_each_entry_safe(test, n, &file->triggers, list) { if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { hist_data = test->private_data; list_del_rcu(&test->list); trace_event_trigger_enable_disable(file, 0); se_name = trace_event_name(file->event_call); se = find_synth_event(se_name); if (se) se->ref--; update_cond_flag(file); if (hist_data->enable_timestamps) tracing_set_filter_buffering(file->tr, false); if (test->ops->free) test->ops->free(test); } } } static int event_hist_trigger_parse(struct event_command *cmd_ops, struct trace_event_file *file, char *glob, char *cmd, char *param_and_filter) { unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT; struct event_trigger_data *trigger_data; struct hist_trigger_attrs *attrs; struct hist_trigger_data *hist_data; char *param, *filter, *p, *start; struct synth_event *se; const char *se_name; bool remove; int ret = 0; lockdep_assert_held(&event_mutex); if (WARN_ON(!glob)) return -EINVAL; if (glob[0]) { hist_err_clear(); last_cmd_set(file, param_and_filter); } remove = event_trigger_check_remove(glob); if (event_trigger_empty_param(param_and_filter)) return -EINVAL; /* * separate the trigger from the filter (k:v [if filter]) * allowing for whitespace in the trigger */ p = param = param_and_filter; do { p = strstr(p, "if"); if (!p) break; if (p == param_and_filter) return -EINVAL; if (*(p - 1) != ' ' && *(p - 1) != '\t') { p++; continue; } if (p >= param_and_filter + strlen(param_and_filter) - (sizeof("if") - 1) - 1) return -EINVAL; if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') { p++; continue; } break; } while (1); if (!p) filter = NULL; else { *(p - 1) = '\0'; filter = strstrip(p); param = strstrip(param); } /* * To simplify arithmetic expression parsing, replace occurrences of * '.sym-offset' modifier with '.symXoffset' */ start = strstr(param, ".sym-offset"); while (start) { *(start + 4) = 'X'; start = strstr(start + 11, ".sym-offset"); } attrs = parse_hist_trigger_attrs(file->tr, param); if (IS_ERR(attrs)) return PTR_ERR(attrs); if (attrs->map_bits) hist_trigger_bits = attrs->map_bits; hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove); if (IS_ERR(hist_data)) { destroy_hist_trigger_attrs(attrs); return PTR_ERR(hist_data); } trigger_data = event_trigger_alloc(cmd_ops, cmd, param, hist_data); if (!trigger_data) { ret = -ENOMEM; goto out_free; } ret = event_trigger_set_filter(cmd_ops, file, filter, trigger_data); if (ret < 0) goto out_free; if (remove) { if (!have_hist_trigger_match(trigger_data, file)) goto out_free; if (hist_trigger_check_refs(trigger_data, file)) { ret = -EBUSY; goto out_free; } event_trigger_unregister(cmd_ops, file, glob+1, trigger_data); se_name = trace_event_name(file->event_call); se = find_synth_event(se_name); if (se) se->ref--; ret = 0; goto out_free; } if (existing_hist_update_only(glob, trigger_data, file)) goto out_free; ret = event_trigger_register(cmd_ops, file, glob, trigger_data); if (ret < 0) goto out_free; if (get_named_trigger_data(trigger_data)) goto enable; ret = create_actions(hist_data); if (ret) goto out_unreg; if (has_hist_vars(hist_data) || hist_data->n_var_refs) { ret = save_hist_vars(hist_data); if (ret) goto out_unreg; } ret = tracing_map_init(hist_data->map); if (ret) goto out_unreg; enable: ret = hist_trigger_enable(trigger_data, file); if (ret) goto out_unreg; se_name = trace_event_name(file->event_call); se = find_synth_event(se_name); if (se) se->ref++; out: if (ret == 0 && glob[0]) hist_err_clear(); return ret; out_unreg: event_trigger_unregister(cmd_ops, file, glob+1, trigger_data); out_free: event_trigger_reset_filter(cmd_ops, trigger_data); remove_hist_vars(hist_data); kfree(trigger_data); destroy_hist_data(hist_data); goto out; } static struct event_command trigger_hist_cmd = { .name = "hist", .trigger_type = ETT_EVENT_HIST, .flags = EVENT_CMD_FL_NEEDS_REC, .parse = event_hist_trigger_parse, .reg = hist_register_trigger, .unreg = hist_unregister_trigger, .unreg_all = hist_unreg_all, .get_trigger_ops = event_hist_get_trigger_ops, .set_filter = set_trigger_filter, }; __init int register_trigger_hist_cmd(void) { int ret; ret = register_event_command(&trigger_hist_cmd); WARN_ON(ret < 0); return ret; } static void hist_enable_trigger(struct event_trigger_data *data, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *event) { struct enable_trigger_data *enable_data = data->private_data; struct event_trigger_data *test; list_for_each_entry_rcu(test, &enable_data->file->triggers, list, lockdep_is_held(&event_mutex)) { if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { if (enable_data->enable) test->paused = false; else test->paused = true; } } } static void hist_enable_count_trigger(struct event_trigger_data *data, struct trace_buffer *buffer, void *rec, struct ring_buffer_event *event) { if (!data->count) return; if (data->count != -1) (data->count)--; hist_enable_trigger(data, buffer, rec, event); } static struct event_trigger_ops hist_enable_trigger_ops = { .trigger = hist_enable_trigger, .print = event_enable_trigger_print, .init = event_trigger_init, .free = event_enable_trigger_free, }; static struct event_trigger_ops hist_enable_count_trigger_ops = { .trigger = hist_enable_count_trigger, .print = event_enable_trigger_print, .init = event_trigger_init, .free = event_enable_trigger_free, }; static struct event_trigger_ops hist_disable_trigger_ops = { .trigger = hist_enable_trigger, .print = event_enable_trigger_print, .init = event_trigger_init, .free = event_enable_trigger_free, }; static struct event_trigger_ops hist_disable_count_trigger_ops = { .trigger = hist_enable_count_trigger, .print = event_enable_trigger_print, .init = event_trigger_init, .free = event_enable_trigger_free, }; static struct event_trigger_ops * hist_enable_get_trigger_ops(char *cmd, char *param) { struct event_trigger_ops *ops; bool enable; enable = (strcmp(cmd, ENABLE_HIST_STR) == 0); if (enable) ops = param ? &hist_enable_count_trigger_ops : &hist_enable_trigger_ops; else ops = param ? &hist_disable_count_trigger_ops : &hist_disable_trigger_ops; return ops; } static void hist_enable_unreg_all(struct trace_event_file *file) { struct event_trigger_data *test, *n; list_for_each_entry_safe(test, n, &file->triggers, list) { if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) { list_del_rcu(&test->list); update_cond_flag(file); trace_event_trigger_enable_disable(file, 0); if (test->ops->free) test->ops->free(test); } } } static struct event_command trigger_hist_enable_cmd = { .name = ENABLE_HIST_STR, .trigger_type = ETT_HIST_ENABLE, .parse = event_enable_trigger_parse, .reg = event_enable_register_trigger, .unreg = event_enable_unregister_trigger, .unreg_all = hist_enable_unreg_all, .get_trigger_ops = hist_enable_get_trigger_ops, .set_filter = set_trigger_filter, }; static struct event_command trigger_hist_disable_cmd = { .name = DISABLE_HIST_STR, .trigger_type = ETT_HIST_ENABLE, .parse = event_enable_trigger_parse, .reg = event_enable_register_trigger, .unreg = event_enable_unregister_trigger, .unreg_all = hist_enable_unreg_all, .get_trigger_ops = hist_enable_get_trigger_ops, .set_filter = set_trigger_filter, }; static __init void unregister_trigger_hist_enable_disable_cmds(void) { unregister_event_command(&trigger_hist_enable_cmd); unregister_event_command(&trigger_hist_disable_cmd); } __init int register_trigger_hist_enable_disable_cmds(void) { int ret; ret = register_event_command(&trigger_hist_enable_cmd); if (WARN_ON(ret < 0)) return ret; ret = register_event_command(&trigger_hist_disable_cmd); if (WARN_ON(ret < 0)) unregister_trigger_hist_enable_disable_cmds(); return ret; }
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