tools/perf/util/callchain.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __PERF_CALLCHAIN_H
   3 #define __PERF_CALLCHAIN_H
   4
   5 #include "../perf.h"
   6 #include <linux/list.h>
   7 #include <linux/rbtree.h>
   8 #include "event.h"
   9 #include "map.h"
  10 #include "symbol.h"
  11 #include "branch.h"
  12
  13 #define HELP_PAD "\t\t\t\t"
  14
  15 #define CALLCHAIN_HELP "setup and enables call-graph (stack chain/backtrace):\n\n"
  16
  17 # define RECORD_MODE_HELP  HELP_PAD "record_mode:\tcall graph recording mode (fp|dwarf|lbr)\n"
  18
  19 #define RECORD_SIZE_HELP                                                \
  20         HELP_PAD "record_size:\tif record_mode is 'dwarf', max size of stack recording (<bytes>)\n" \
  21         HELP_PAD "\t\tdefault: 8192 (bytes)\n"
  22
  23 #define CALLCHAIN_RECORD_HELP  CALLCHAIN_HELP RECORD_MODE_HELP RECORD_SIZE_HELP
  24
  25 #define CALLCHAIN_REPORT_HELP                                           \
  26         HELP_PAD "print_type:\tcall graph printing style (graph|flat|fractal|folded|none)\n" \
  27         HELP_PAD "threshold:\tminimum call graph inclusion threshold (<percent>)\n" \
  28         HELP_PAD "print_limit:\tmaximum number of call graph entry (<number>)\n" \
  29         HELP_PAD "order:\t\tcall graph order (caller|callee)\n" \
  30         HELP_PAD "sort_key:\tcall graph sort key (function|address)\n"  \
  31         HELP_PAD "branch:\t\tinclude last branch info to call graph (branch)\n" \
  32         HELP_PAD "value:\t\tcall graph value (percent|period|count)\n"
  33
  34 enum perf_call_graph_mode {
  35         CALLCHAIN_NONE,
  36         CALLCHAIN_FP,
  37         CALLCHAIN_DWARF,
  38         CALLCHAIN_LBR,
  39         CALLCHAIN_MAX
  40 };
  41
  42 enum chain_mode {
  43         CHAIN_NONE,
  44         CHAIN_FLAT,
  45         CHAIN_GRAPH_ABS,
  46         CHAIN_GRAPH_REL,
  47         CHAIN_FOLDED,
  48 };
  49
  50 enum chain_order {
  51         ORDER_CALLER,
  52         ORDER_CALLEE
  53 };
  54
  55 struct callchain_node {
  56         struct callchain_node   *parent;
  57         struct list_head        val;
  58         struct list_head        parent_val;
  59         struct rb_node          rb_node_in; /* to insert nodes in an rbtree */
  60         struct rb_node          rb_node;    /* to sort nodes in an output tree */
  61         struct rb_root          rb_root_in; /* input tree of children */
  62         struct rb_root          rb_root;    /* sorted output tree of children */
  63         unsigned int            val_nr;
  64         unsigned int            count;
  65         unsigned int            children_count;
  66         u64                     hit;
  67         u64                     children_hit;
  68 };
  69
  70 struct callchain_root {
  71         u64                     max_depth;
  72         struct callchain_node   node;
  73 };
  74
  75 struct callchain_param;
  76
  77 typedef void (*sort_chain_func_t)(struct rb_root *, struct callchain_root *,
  78                                  u64, struct callchain_param *);
  79
  80 enum chain_key {
  81         CCKEY_FUNCTION,
  82         CCKEY_ADDRESS,
  83         CCKEY_SRCLINE
  84 };
  85
  86 enum chain_value {
  87         CCVAL_PERCENT,
  88         CCVAL_PERIOD,
  89         CCVAL_COUNT,
  90 };
  91
  92 extern bool dwarf_callchain_users;
  93
  94 struct callchain_param {
  95         bool                    enabled;
  96         enum perf_call_graph_mode record_mode;
  97         u32                     dump_size;
  98         enum chain_mode         mode;
  99         u16                     max_stack;
 100         u32                     print_limit;
 101         double                  min_percent;
 102         sort_chain_func_t       sort;
 103         enum chain_order        order;
 104         bool                    order_set;
 105         enum chain_key          key;
 106         bool                    branch_callstack;
 107         enum chain_value        value;
 108 };
 109
 110 extern struct callchain_param callchain_param;
 111 extern struct callchain_param callchain_param_default;
 112
 113 struct callchain_list {
 114         u64                     ip;
 115         struct map_symbol       ms;
 116         struct /* for TUI */ {
 117                 bool            unfolded;
 118                 bool            has_children;
 119         };
 120         u64                     branch_count;
 121         u64                     predicted_count;
 122         u64                     abort_count;
 123         u64                     cycles_count;
 124         u64                     iter_count;
 125         u64                     iter_cycles;
 126         struct branch_type_stat brtype_stat;
 127         const char              *srcline;
 128         struct list_head        list;
 129 };
 130
 131 /*
 132  * A callchain cursor is a single linked list that
 133  * let one feed a callchain progressively.
 134  * It keeps persistent allocated entries to minimize
 135  * allocations.
 136  */
 137 struct callchain_cursor_node {
 138         u64                             ip;
 139         struct map                      *map;
 140         struct symbol                   *sym;
 141         const char                      *srcline;
 142         bool                            branch;
 143         struct branch_flags             branch_flags;
 144         u64                             branch_from;
 145         int                             nr_loop_iter;
 146         u64                             iter_cycles;
 147         struct callchain_cursor_node    *next;
 148 };
 149
 150 struct callchain_cursor {
 151         u64                             nr;
 152         struct callchain_cursor_node    *first;
 153         struct callchain_cursor_node    **last;
 154         u64                             pos;
 155         struct callchain_cursor_node    *curr;
 156 };
 157
 158 extern __thread struct callchain_cursor callchain_cursor;
 159
 160 static inline void callchain_init(struct callchain_root *root)
 161 {
 162         INIT_LIST_HEAD(&root->node.val);
 163         INIT_LIST_HEAD(&root->node.parent_val);
 164
 165         root->node.parent = NULL;
 166         root->node.hit = 0;
 167         root->node.children_hit = 0;
 168         root->node.rb_root_in = RB_ROOT;
 169         root->max_depth = 0;
 170 }
 171
 172 static inline u64 callchain_cumul_hits(struct callchain_node *node)
 173 {
 174         return node->hit + node->children_hit;
 175 }
 176
 177 static inline unsigned callchain_cumul_counts(struct callchain_node *node)
 178 {
 179         return node->count + node->children_count;
 180 }
 181
 182 int callchain_register_param(struct callchain_param *param);
 183 int callchain_append(struct callchain_root *root,
 184                      struct callchain_cursor *cursor,
 185                      u64 period);
 186
 187 int callchain_merge(struct callchain_cursor *cursor,
 188                     struct callchain_root *dst, struct callchain_root *src);
 189
 190 /*
 191  * Initialize a cursor before adding entries inside, but keep
 192  * the previously allocated entries as a cache.
 193  */
 194 static inline void callchain_cursor_reset(struct callchain_cursor *cursor)
 195 {
 196         struct callchain_cursor_node *node;
 197
 198         cursor->nr = 0;
 199         cursor->last = &cursor->first;
 200
 201         for (node = cursor->first; node != NULL; node = node->next)
 202                 map__zput(node->map);
 203 }
 204
 205 int callchain_cursor_append(struct callchain_cursor *cursor, u64 ip,
 206                             struct map *map, struct symbol *sym,
 207                             bool branch, struct branch_flags *flags,
 208                             int nr_loop_iter, u64 iter_cycles, u64 branch_from,
 209                             const char *srcline);
 210
 211 /* Close a cursor writing session. Initialize for the reader */
 212 static inline void callchain_cursor_commit(struct callchain_cursor *cursor)
 213 {
 214         cursor->curr = cursor->first;
 215         cursor->pos = 0;
 216 }
 217
 218 /* Cursor reading iteration helpers */
 219 static inline struct callchain_cursor_node *
 220 callchain_cursor_current(struct callchain_cursor *cursor)
 221 {
 222         if (cursor->pos == cursor->nr)
 223                 return NULL;
 224
 225         return cursor->curr;
 226 }
 227
 228 static inline void callchain_cursor_advance(struct callchain_cursor *cursor)
 229 {
 230         cursor->curr = cursor->curr->next;
 231         cursor->pos++;
 232 }
 233
 234 int callchain_cursor__copy(struct callchain_cursor *dst,
 235                            struct callchain_cursor *src);
 236
 237 struct option;
 238 struct hist_entry;
 239
 240 int record_parse_callchain_opt(const struct option *opt, const char *arg, int unset);
 241 int record_callchain_opt(const struct option *opt, const char *arg, int unset);
 242
 243 struct record_opts;
 244
 245 int record_opts__parse_callchain(struct record_opts *record,
 246                                  struct callchain_param *callchain,
 247                                  const char *arg, bool unset);
 248
 249 int sample__resolve_callchain(struct perf_sample *sample,
 250                               struct callchain_cursor *cursor, struct symbol **parent,
 251                               struct perf_evsel *evsel, struct addr_location *al,
 252                               int max_stack);
 253 int hist_entry__append_callchain(struct hist_entry *he, struct perf_sample *sample);
 254 int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *node,
 255                         bool hide_unresolved);
 256
 257 extern const char record_callchain_help[];
 258 int parse_callchain_record(const char *arg, struct callchain_param *param);
 259 int parse_callchain_record_opt(const char *arg, struct callchain_param *param);
 260 int parse_callchain_report_opt(const char *arg);
 261 int parse_callchain_top_opt(const char *arg);
 262 int perf_callchain_config(const char *var, const char *value);
 263
 264 static inline void callchain_cursor_snapshot(struct callchain_cursor *dest,
 265                                              struct callchain_cursor *src)
 266 {
 267         *dest = *src;
 268
 269         dest->first = src->curr;
 270         dest->nr -= src->pos;
 271 }
 272
 273 #ifdef HAVE_SKIP_CALLCHAIN_IDX
 274 int arch_skip_callchain_idx(struct thread *thread, struct ip_callchain *chain);
 275 #else
 276 static inline int arch_skip_callchain_idx(struct thread *thread __maybe_unused,
 277                         struct ip_callchain *chain __maybe_unused)
 278 {
 279         return -1;
 280 }
 281 #endif
 282
 283 char *callchain_list__sym_name(struct callchain_list *cl,
 284                                char *bf, size_t bfsize, bool show_dso);
 285 char *callchain_node__scnprintf_value(struct callchain_node *node,
 286                                       char *bf, size_t bfsize, u64 total);
 287 int callchain_node__fprintf_value(struct callchain_node *node,
 288                                   FILE *fp, u64 total);
 289
 290 int callchain_list_counts__printf_value(struct callchain_list *clist,
 291                                         FILE *fp, char *bf, int bfsize);
 292
 293 void free_callchain(struct callchain_root *root);
 294 void decay_callchain(struct callchain_root *root);
 295 int callchain_node__make_parent_list(struct callchain_node *node);
 296
 297 int callchain_branch_counts(struct callchain_root *root,
 298                             u64 *branch_count, u64 *predicted_count,
 299                             u64 *abort_count, u64 *cycles_count);
 300
 301 #endif  /* __PERF_CALLCHAIN_H */