330 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>4 */5#include <stdio.h>6#include <stdlib.h>7#include <string.h>8#include <errno.h>9 10#include "debug.h"11#include "trace-event.h"12 13#include <linux/ctype.h>14#include <linux/kernel.h>15#include <traceevent/event-parse.h>16 17static int get_common_field(struct scripting_context *context,18 int *offset, int *size, const char *type)19{20 struct tep_handle *pevent = context->pevent;21 struct tep_event *event;22 struct tep_format_field *field;23 24 if (!*size) {25 26 event = tep_get_first_event(pevent);27 if (!event)28 return 0;29 30 field = tep_find_common_field(event, type);31 if (!field)32 return 0;33 *offset = field->offset;34 *size = field->size;35 }36 37 return tep_read_number(pevent, context->event_data + *offset, *size);38}39 40int common_lock_depth(struct scripting_context *context)41{42 static int offset;43 static int size;44 int ret;45 46 ret = get_common_field(context, &size, &offset,47 "common_lock_depth");48 if (ret < 0)49 return -1;50 51 return ret;52}53 54int common_flags(struct scripting_context *context)55{56 static int offset;57 static int size;58 int ret;59 60 ret = get_common_field(context, &size, &offset,61 "common_flags");62 if (ret < 0)63 return -1;64 65 return ret;66}67 68int common_pc(struct scripting_context *context)69{70 static int offset;71 static int size;72 int ret;73 74 ret = get_common_field(context, &size, &offset,75 "common_preempt_count");76 if (ret < 0)77 return -1;78 79 return ret;80}81 82unsigned long long83raw_field_value(struct tep_event *event, const char *name, void *data)84{85 struct tep_format_field *field;86 unsigned long long val;87 88 field = tep_find_any_field(event, name);89 if (!field)90 return 0ULL;91 92 tep_read_number_field(field, data, &val);93 94 return val;95}96 97unsigned long long read_size(struct tep_event *event, void *ptr, int size)98{99 return tep_read_number(event->tep, ptr, size);100}101 102void event_format__fprintf(struct tep_event *event,103 int cpu, void *data, int size, FILE *fp)104{105 struct tep_record record;106 struct trace_seq s;107 108 memset(&record, 0, sizeof(record));109 record.cpu = cpu;110 record.size = size;111 record.data = data;112 113 trace_seq_init(&s);114 tep_print_event(event->tep, &s, &record, "%s", TEP_PRINT_INFO);115 trace_seq_do_fprintf(&s, fp);116 trace_seq_destroy(&s);117}118 119void event_format__print(struct tep_event *event,120 int cpu, void *data, int size)121{122 return event_format__fprintf(event, cpu, data, size, stdout);123}124 125/*126 * prev_state is of size long, which is 32 bits on 32 bit architectures.127 * As it needs to have the same bits for both 32 bit and 64 bit architectures128 * we can just assume that the flags we care about will all be within129 * the 32 bits.130 */131#define MAX_STATE_BITS 32132 133static const char *convert_sym(struct tep_print_flag_sym *sym)134{135 static char save_states[MAX_STATE_BITS + 1];136 137 memset(save_states, 0, sizeof(save_states));138 139 /* This is the flags for the prev_state_field, now make them into a string */140 for (; sym; sym = sym->next) {141 long bitmask = strtoul(sym->value, NULL, 0);142 int i;143 144 for (i = 0; !(bitmask & 1); i++)145 bitmask >>= 1;146 147 if (i >= MAX_STATE_BITS)148 continue;149 150 save_states[i] = sym->str[0];151 }152 153 return save_states;154}155 156static struct tep_print_arg_field *157find_arg_field(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)158{159 struct tep_print_arg_field *field;160 161 if (!arg)162 return NULL;163 164 if (arg->type == TEP_PRINT_FIELD)165 return &arg->field;166 167 if (arg->type == TEP_PRINT_OP) {168 field = find_arg_field(prev_state_field, arg->op.left);169 if (field && field->field == prev_state_field)170 return field;171 field = find_arg_field(prev_state_field, arg->op.right);172 if (field && field->field == prev_state_field)173 return field;174 }175 return NULL;176}177 178static struct tep_print_flag_sym *179test_flags(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)180{181 struct tep_print_arg_field *field;182 183 field = find_arg_field(prev_state_field, arg->flags.field);184 if (!field)185 return NULL;186 187 return arg->flags.flags;188}189 190static struct tep_print_flag_sym *191search_op(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)192{193 struct tep_print_flag_sym *sym = NULL;194 195 if (!arg)196 return NULL;197 198 if (arg->type == TEP_PRINT_OP) {199 sym = search_op(prev_state_field, arg->op.left);200 if (sym)201 return sym;202 203 sym = search_op(prev_state_field, arg->op.right);204 if (sym)205 return sym;206 } else if (arg->type == TEP_PRINT_FLAGS) {207 sym = test_flags(prev_state_field, arg);208 }209 210 return sym;211}212 213const char *parse_task_states(struct tep_format_field *state_field)214{215 struct tep_print_flag_sym *sym;216 struct tep_print_arg *arg;217 struct tep_event *event;218 219 event = state_field->event;220 221 /*222 * Look at the event format fields, and search for where223 * the prev_state is parsed via the format flags.224 */225 for (arg = event->print_fmt.args; arg; arg = arg->next) {226 /*227 * Currently, the __print_flags() for the prev_state228 * is embedded in operations, so they too must be229 * searched.230 */231 sym = search_op(state_field, arg);232 if (sym)233 return convert_sym(sym);234 }235 return NULL;236}237 238void parse_ftrace_printk(struct tep_handle *pevent,239 char *file, unsigned int size __maybe_unused)240{241 unsigned long long addr;242 char *printk;243 char *line;244 char *next = NULL;245 char *addr_str;246 char *fmt = NULL;247 248 line = strtok_r(file, "\n", &next);249 while (line) {250 addr_str = strtok_r(line, ":", &fmt);251 if (!addr_str) {252 pr_warning("printk format with empty entry");253 break;254 }255 addr = strtoull(addr_str, NULL, 16);256 /* fmt still has a space, skip it */257 printk = strdup(fmt+1);258 line = strtok_r(NULL, "\n", &next);259 tep_register_print_string(pevent, printk, addr);260 free(printk);261 }262}263 264void parse_saved_cmdline(struct tep_handle *pevent,265 char *file, unsigned int size __maybe_unused)266{267 char comm[17]; /* Max comm length in the kernel is 16. */268 char *line;269 char *next = NULL;270 int pid;271 272 line = strtok_r(file, "\n", &next);273 while (line) {274 if (sscanf(line, "%d %16s", &pid, comm) == 2)275 tep_register_comm(pevent, comm, pid);276 line = strtok_r(NULL, "\n", &next);277 }278}279 280int parse_ftrace_file(struct tep_handle *pevent, char *buf, unsigned long size)281{282 return tep_parse_event(pevent, buf, size, "ftrace");283}284 285int parse_event_file(struct tep_handle *pevent,286 char *buf, unsigned long size, char *sys)287{288 return tep_parse_event(pevent, buf, size, sys);289}290 291struct flag {292 const char *name;293 unsigned long long value;294};295 296static const struct flag flags[] = {297 { "HI_SOFTIRQ", 0 },298 { "TIMER_SOFTIRQ", 1 },299 { "NET_TX_SOFTIRQ", 2 },300 { "NET_RX_SOFTIRQ", 3 },301 { "BLOCK_SOFTIRQ", 4 },302 { "IRQ_POLL_SOFTIRQ", 5 },303 { "TASKLET_SOFTIRQ", 6 },304 { "SCHED_SOFTIRQ", 7 },305 { "HRTIMER_SOFTIRQ", 8 },306 { "RCU_SOFTIRQ", 9 },307 308 { "HRTIMER_NORESTART", 0 },309 { "HRTIMER_RESTART", 1 },310};311 312unsigned long long eval_flag(const char *flag)313{314 int i;315 316 /*317 * Some flags in the format files do not get converted.318 * If the flag is not numeric, see if it is something that319 * we already know about.320 */321 if (isdigit(flag[0]))322 return strtoull(flag, NULL, 0);323 324 for (i = 0; i < (int)(ARRAY_SIZE(flags)); i++)325 if (strcmp(flags[i].name, flag) == 0)326 return flags[i].value;327 328 return 0;329}330