tools/perf/util/trace-event-parse.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   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 <event-parse.h>
  16
  17 static 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
  40 int 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
  54 int 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
  68 int 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
  82 unsigned long long
  83 raw_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
  97 unsigned long long read_size(struct tep_event *event, void *ptr, int size)
  98 {
  99         return tep_read_number(event->tep, ptr, size);
 100 }
 101
 102 void 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
 119 /*
 120  * prev_state is of size long, which is 32 bits on 32 bit architectures.
 121  * As it needs to have the same bits for both 32 bit and 64 bit architectures
 122  * we can just assume that the flags we care about will all be within
 123  * the 32 bits.
 124  */
 125 #define MAX_STATE_BITS 32
 126
 127 static const char *convert_sym(struct tep_print_flag_sym *sym)
 128 {
 129         static char save_states[MAX_STATE_BITS + 1];
 130
 131         memset(save_states, 0, sizeof(save_states));
 132
 133         /* This is the flags for the prev_state_field, now make them into a string */
 134         for (; sym; sym = sym->next) {
 135                 long bitmask = strtoul(sym->value, NULL, 0);
 136                 int i;
 137
 138                 for (i = 0; !(bitmask & 1); i++)
 139                         bitmask >>= 1;
 140
 141                 if (i >= MAX_STATE_BITS)
 142                         continue;
 143
 144                 save_states[i] = sym->str[0];
 145         }
 146
 147         return save_states;
 148 }
 149
 150 static struct tep_print_arg_field *
 151 find_arg_field(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
 152 {
 153         struct tep_print_arg_field *field;
 154
 155         if (!arg)
 156                 return NULL;
 157
 158         if (arg->type == TEP_PRINT_FIELD)
 159                 return &arg->field;
 160
 161         if (arg->type == TEP_PRINT_OP) {
 162                 field = find_arg_field(prev_state_field, arg->op.left);
 163                 if (field && field->field == prev_state_field)
 164                         return field;
 165                 field = find_arg_field(prev_state_field, arg->op.right);
 166                 if (field && field->field == prev_state_field)
 167                         return field;
 168         }
 169         return NULL;
 170 }
 171
 172 static struct tep_print_flag_sym *
 173 test_flags(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
 174 {
 175         struct tep_print_arg_field *field;
 176
 177         field = find_arg_field(prev_state_field, arg->flags.field);
 178         if (!field)
 179                 return NULL;
 180
 181         return arg->flags.flags;
 182 }
 183
 184 static struct tep_print_flag_sym *
 185 search_op(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
 186 {
 187         struct tep_print_flag_sym *sym = NULL;
 188
 189         if (!arg)
 190                 return NULL;
 191
 192         if (arg->type == TEP_PRINT_OP) {
 193                 sym = search_op(prev_state_field, arg->op.left);
 194                 if (sym)
 195                         return sym;
 196
 197                 sym = search_op(prev_state_field, arg->op.right);
 198                 if (sym)
 199                         return sym;
 200         } else if (arg->type == TEP_PRINT_FLAGS) {
 201                 sym = test_flags(prev_state_field, arg);
 202         }
 203
 204         return sym;
 205 }
 206
 207 const char *parse_task_states(struct tep_format_field *state_field)
 208 {
 209         struct tep_print_flag_sym *sym;
 210         struct tep_print_arg *arg;
 211         struct tep_event *event;
 212
 213         event = state_field->event;
 214
 215         /*
 216          * Look at the event format fields, and search for where
 217          * the prev_state is parsed via the format flags.
 218          */
 219         for (arg = event->print_fmt.args; arg; arg = arg->next) {
 220                 /*
 221                  * Currently, the __print_flags() for the prev_state
 222                  * is embedded in operations, so they too must be
 223                  * searched.
 224                  */
 225                 sym = search_op(state_field, arg);
 226                 if (sym)
 227                         return convert_sym(sym);
 228         }
 229         return NULL;
 230 }
 231
 232 void parse_ftrace_printk(struct tep_handle *pevent,
 233                          char *file, unsigned int size __maybe_unused)
 234 {
 235         unsigned long long addr;
 236         char *printk;
 237         char *line;
 238         char *next = NULL;
 239         char *addr_str;
 240         char *fmt = NULL;
 241
 242         line = strtok_r(file, "\n", &next);
 243         while (line) {
 244                 addr_str = strtok_r(line, ":", &fmt);
 245                 if (!addr_str) {
 246                         pr_warning("printk format with empty entry");
 247                         break;
 248                 }
 249                 addr = strtoull(addr_str, NULL, 16);
 250                 /* fmt still has a space, skip it */
 251                 printk = strdup(fmt+1);
 252                 line = strtok_r(NULL, "\n", &next);
 253                 tep_register_print_string(pevent, printk, addr);
 254                 free(printk);
 255         }
 256 }
 257
 258 void parse_saved_cmdline(struct tep_handle *pevent,
 259                          char *file, unsigned int size __maybe_unused)
 260 {
 261         char comm[17]; /* Max comm length in the kernel is 16. */
 262         char *line;
 263         char *next = NULL;
 264         int pid;
 265
 266         line = strtok_r(file, "\n", &next);
 267         while (line) {
 268                 if (sscanf(line, "%d %16s", &pid, comm) == 2)
 269                         tep_register_comm(pevent, comm, pid);
 270                 line = strtok_r(NULL, "\n", &next);
 271         }
 272 }
 273
 274 int parse_ftrace_file(struct tep_handle *pevent, char *buf, unsigned long size)
 275 {
 276         return tep_parse_event(pevent, buf, size, "ftrace");
 277 }
 278
 279 int parse_event_file(struct tep_handle *pevent,
 280                      char *buf, unsigned long size, char *sys)
 281 {
 282         return tep_parse_event(pevent, buf, size, sys);
 283 }
 284
 285 struct flag {
 286         const char *name;
 287         unsigned long long value;
 288 };
 289
 290 static const struct flag flags[] = {
 291         { "HI_SOFTIRQ", 0 },
 292         { "TIMER_SOFTIRQ", 1 },
 293         { "NET_TX_SOFTIRQ", 2 },
 294         { "NET_RX_SOFTIRQ", 3 },
 295         { "BLOCK_SOFTIRQ", 4 },
 296         { "IRQ_POLL_SOFTIRQ", 5 },
 297         { "TASKLET_SOFTIRQ", 6 },
 298         { "SCHED_SOFTIRQ", 7 },
 299         { "HRTIMER_SOFTIRQ", 8 },
 300         { "RCU_SOFTIRQ", 9 },
 301
 302         { "HRTIMER_NORESTART", 0 },
 303         { "HRTIMER_RESTART", 1 },
 304 };
 305
 306 unsigned long long eval_flag(const char *flag)
 307 {
 308         int i;
 309
 310         /*
 311          * Some flags in the format files do not get converted.
 312          * If the flag is not numeric, see if it is something that
 313          * we already know about.
 314          */
 315         if (isdigit(flag[0]))
 316                 return strtoull(flag, NULL, 0);
 317
 318         for (i = 0; i < (int)(ARRAY_SIZE(flags)); i++)
 319                 if (strcmp(flags[i].name, flag) == 0)
 320                         return flags[i].value;
 321
 322         return 0;
 323 }