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910 lines
18 KiB
910 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* config.c |
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* |
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* Helper functions for parsing config items. |
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* Originally copied from GIT source. |
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* |
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* Copyright (C) Linus Torvalds, 2005 |
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* Copyright (C) Johannes Schindelin, 2005 |
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* |
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*/ |
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#include <errno.h> |
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#include <sys/param.h> |
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#include "cache.h" |
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#include "callchain.h" |
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#include <subcmd/exec-cmd.h> |
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#include "util/event.h" /* proc_map_timeout */ |
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#include "util/hist.h" /* perf_hist_config */ |
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#include "util/llvm-utils.h" /* perf_llvm_config */ |
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#include "util/stat.h" /* perf_stat__set_big_num */ |
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#include "util/evsel.h" /* evsel__hw_names, evsel__use_bpf_counters */ |
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#include "build-id.h" |
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#include "debug.h" |
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#include "config.h" |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <linux/string.h> |
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#include <linux/zalloc.h> |
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#include <linux/ctype.h> |
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#define MAXNAME (256) |
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#define DEBUG_CACHE_DIR ".debug" |
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char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */ |
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static FILE *config_file; |
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static const char *config_file_name; |
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static int config_linenr; |
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static int config_file_eof; |
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static struct perf_config_set *config_set; |
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const char *config_exclusive_filename; |
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static int get_next_char(void) |
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{ |
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int c; |
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FILE *f; |
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c = '\n'; |
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if ((f = config_file) != NULL) { |
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c = fgetc(f); |
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if (c == '\r') { |
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/* DOS like systems */ |
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c = fgetc(f); |
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if (c != '\n') { |
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ungetc(c, f); |
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c = '\r'; |
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} |
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} |
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if (c == '\n') |
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config_linenr++; |
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if (c == EOF) { |
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config_file_eof = 1; |
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c = '\n'; |
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} |
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} |
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return c; |
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} |
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static char *parse_value(void) |
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{ |
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static char value[1024]; |
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int quote = 0, comment = 0, space = 0; |
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size_t len = 0; |
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for (;;) { |
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int c = get_next_char(); |
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if (len >= sizeof(value) - 1) |
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return NULL; |
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if (c == '\n') { |
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if (quote) |
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return NULL; |
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value[len] = 0; |
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return value; |
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} |
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if (comment) |
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continue; |
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if (isspace(c) && !quote) { |
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space = 1; |
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continue; |
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} |
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if (!quote) { |
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if (c == ';' || c == '#') { |
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comment = 1; |
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continue; |
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} |
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} |
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if (space) { |
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if (len) |
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value[len++] = ' '; |
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space = 0; |
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} |
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if (c == '\\') { |
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c = get_next_char(); |
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switch (c) { |
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case '\n': |
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continue; |
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case 't': |
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c = '\t'; |
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break; |
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case 'b': |
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c = '\b'; |
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break; |
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case 'n': |
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c = '\n'; |
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break; |
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/* Some characters escape as themselves */ |
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case '\\': case '"': |
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break; |
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/* Reject unknown escape sequences */ |
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default: |
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return NULL; |
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} |
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value[len++] = c; |
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continue; |
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} |
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if (c == '"') { |
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quote = 1-quote; |
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continue; |
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} |
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value[len++] = c; |
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} |
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} |
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static inline int iskeychar(int c) |
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{ |
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return isalnum(c) || c == '-' || c == '_'; |
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} |
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static int get_value(config_fn_t fn, void *data, char *name, unsigned int len) |
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{ |
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int c; |
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char *value; |
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/* Get the full name */ |
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for (;;) { |
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c = get_next_char(); |
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if (config_file_eof) |
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break; |
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if (!iskeychar(c)) |
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break; |
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name[len++] = c; |
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if (len >= MAXNAME) |
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return -1; |
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} |
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name[len] = 0; |
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while (c == ' ' || c == '\t') |
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c = get_next_char(); |
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value = NULL; |
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if (c != '\n') { |
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if (c != '=') |
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return -1; |
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value = parse_value(); |
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if (!value) |
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return -1; |
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} |
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return fn(name, value, data); |
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} |
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static int get_extended_base_var(char *name, int baselen, int c) |
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{ |
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do { |
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if (c == '\n') |
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return -1; |
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c = get_next_char(); |
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} while (isspace(c)); |
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/* We require the format to be '[base "extension"]' */ |
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if (c != '"') |
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return -1; |
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name[baselen++] = '.'; |
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for (;;) { |
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int ch = get_next_char(); |
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if (ch == '\n') |
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return -1; |
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if (ch == '"') |
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break; |
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if (ch == '\\') { |
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ch = get_next_char(); |
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if (ch == '\n') |
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return -1; |
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} |
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name[baselen++] = ch; |
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if (baselen > MAXNAME / 2) |
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return -1; |
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} |
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/* Final ']' */ |
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if (get_next_char() != ']') |
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return -1; |
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return baselen; |
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} |
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static int get_base_var(char *name) |
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{ |
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int baselen = 0; |
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for (;;) { |
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int c = get_next_char(); |
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if (config_file_eof) |
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return -1; |
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if (c == ']') |
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return baselen; |
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if (isspace(c)) |
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return get_extended_base_var(name, baselen, c); |
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if (!iskeychar(c) && c != '.') |
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return -1; |
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if (baselen > MAXNAME / 2) |
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return -1; |
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name[baselen++] = tolower(c); |
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} |
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} |
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static int perf_parse_file(config_fn_t fn, void *data) |
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{ |
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int comment = 0; |
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int baselen = 0; |
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static char var[MAXNAME]; |
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/* U+FEFF Byte Order Mark in UTF8 */ |
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static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf"; |
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const unsigned char *bomptr = utf8_bom; |
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for (;;) { |
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int line, c = get_next_char(); |
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if (bomptr && *bomptr) { |
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/* We are at the file beginning; skip UTF8-encoded BOM |
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* if present. Sane editors won't put this in on their |
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* own, but e.g. Windows Notepad will do it happily. */ |
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if ((unsigned char) c == *bomptr) { |
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bomptr++; |
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continue; |
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} else { |
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/* Do not tolerate partial BOM. */ |
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if (bomptr != utf8_bom) |
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break; |
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/* No BOM at file beginning. Cool. */ |
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bomptr = NULL; |
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} |
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} |
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if (c == '\n') { |
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if (config_file_eof) |
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return 0; |
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comment = 0; |
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continue; |
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} |
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if (comment || isspace(c)) |
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continue; |
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if (c == '#' || c == ';') { |
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comment = 1; |
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continue; |
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} |
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if (c == '[') { |
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baselen = get_base_var(var); |
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if (baselen <= 0) |
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break; |
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var[baselen++] = '.'; |
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var[baselen] = 0; |
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continue; |
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} |
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if (!isalpha(c)) |
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break; |
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var[baselen] = tolower(c); |
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/* |
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* The get_value function might or might not reach the '\n', |
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* so saving the current line number for error reporting. |
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*/ |
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line = config_linenr; |
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if (get_value(fn, data, var, baselen+1) < 0) { |
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config_linenr = line; |
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break; |
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} |
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} |
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pr_err("bad config file line %d in %s\n", config_linenr, config_file_name); |
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return -1; |
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} |
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static int parse_unit_factor(const char *end, unsigned long *val) |
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{ |
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if (!*end) |
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return 1; |
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else if (!strcasecmp(end, "k")) { |
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*val *= 1024; |
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return 1; |
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} |
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else if (!strcasecmp(end, "m")) { |
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*val *= 1024 * 1024; |
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return 1; |
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} |
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else if (!strcasecmp(end, "g")) { |
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*val *= 1024 * 1024 * 1024; |
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return 1; |
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} |
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return 0; |
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} |
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static int perf_parse_llong(const char *value, long long *ret) |
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{ |
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if (value && *value) { |
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char *end; |
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long long val = strtoll(value, &end, 0); |
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unsigned long factor = 1; |
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if (!parse_unit_factor(end, &factor)) |
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return 0; |
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*ret = val * factor; |
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return 1; |
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} |
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return 0; |
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} |
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static int perf_parse_long(const char *value, long *ret) |
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{ |
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if (value && *value) { |
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char *end; |
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long val = strtol(value, &end, 0); |
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unsigned long factor = 1; |
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if (!parse_unit_factor(end, &factor)) |
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return 0; |
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*ret = val * factor; |
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return 1; |
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} |
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return 0; |
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} |
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static void bad_config(const char *name) |
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{ |
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if (config_file_name) |
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pr_warning("bad config value for '%s' in %s, ignoring...\n", name, config_file_name); |
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else |
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pr_warning("bad config value for '%s', ignoring...\n", name); |
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} |
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int perf_config_u64(u64 *dest, const char *name, const char *value) |
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{ |
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long long ret = 0; |
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if (!perf_parse_llong(value, &ret)) { |
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bad_config(name); |
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return -1; |
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} |
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*dest = ret; |
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return 0; |
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} |
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int perf_config_int(int *dest, const char *name, const char *value) |
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{ |
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long ret = 0; |
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if (!perf_parse_long(value, &ret)) { |
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bad_config(name); |
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return -1; |
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} |
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*dest = ret; |
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return 0; |
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} |
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int perf_config_u8(u8 *dest, const char *name, const char *value) |
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{ |
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long ret = 0; |
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if (!perf_parse_long(value, &ret)) { |
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bad_config(name); |
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return -1; |
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} |
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*dest = ret; |
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return 0; |
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} |
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static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool) |
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{ |
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int ret; |
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*is_bool = 1; |
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if (!value) |
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return 1; |
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if (!*value) |
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return 0; |
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if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on")) |
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return 1; |
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if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off")) |
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return 0; |
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*is_bool = 0; |
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return perf_config_int(&ret, name, value) < 0 ? -1 : ret; |
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} |
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int perf_config_bool(const char *name, const char *value) |
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{ |
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int discard; |
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return !!perf_config_bool_or_int(name, value, &discard); |
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} |
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static const char *perf_config_dirname(const char *name, const char *value) |
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{ |
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if (!name) |
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return NULL; |
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return value; |
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} |
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static int perf_buildid_config(const char *var, const char *value) |
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{ |
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/* same dir for all commands */ |
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if (!strcmp(var, "buildid.dir")) { |
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const char *dir = perf_config_dirname(var, value); |
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if (!dir) { |
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pr_err("Invalid buildid directory!\n"); |
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return -1; |
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} |
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strncpy(buildid_dir, dir, MAXPATHLEN-1); |
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buildid_dir[MAXPATHLEN-1] = '\0'; |
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} |
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return 0; |
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} |
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static int perf_default_core_config(const char *var __maybe_unused, |
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const char *value __maybe_unused) |
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{ |
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if (!strcmp(var, "core.proc-map-timeout")) |
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proc_map_timeout = strtoul(value, NULL, 10); |
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/* Add other config variables here. */ |
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return 0; |
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} |
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static int perf_ui_config(const char *var, const char *value) |
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{ |
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/* Add other config variables here. */ |
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if (!strcmp(var, "ui.show-headers")) |
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symbol_conf.show_hist_headers = perf_config_bool(var, value); |
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return 0; |
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} |
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static int perf_stat_config(const char *var, const char *value) |
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{ |
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if (!strcmp(var, "stat.big-num")) |
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perf_stat__set_big_num(perf_config_bool(var, value)); |
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if (!strcmp(var, "stat.no-csv-summary")) |
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perf_stat__set_no_csv_summary(perf_config_bool(var, value)); |
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if (!strcmp(var, "stat.bpf-counter-events")) |
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evsel__bpf_counter_events = strdup(value); |
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/* Add other config variables here. */ |
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return 0; |
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} |
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int perf_default_config(const char *var, const char *value, |
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void *dummy __maybe_unused) |
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{ |
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if (strstarts(var, "core.")) |
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return perf_default_core_config(var, value); |
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if (strstarts(var, "hist.")) |
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return perf_hist_config(var, value); |
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if (strstarts(var, "ui.")) |
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return perf_ui_config(var, value); |
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if (strstarts(var, "call-graph.")) |
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return perf_callchain_config(var, value); |
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if (strstarts(var, "llvm.")) |
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return perf_llvm_config(var, value); |
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if (strstarts(var, "buildid.")) |
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return perf_buildid_config(var, value); |
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if (strstarts(var, "stat.")) |
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return perf_stat_config(var, value); |
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/* Add other config variables here. */ |
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return 0; |
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} |
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static int perf_config_from_file(config_fn_t fn, const char *filename, void *data) |
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{ |
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int ret; |
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FILE *f = fopen(filename, "r"); |
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ret = -1; |
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if (f) { |
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config_file = f; |
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config_file_name = filename; |
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config_linenr = 1; |
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config_file_eof = 0; |
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ret = perf_parse_file(fn, data); |
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fclose(f); |
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config_file_name = NULL; |
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} |
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return ret; |
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} |
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const char *perf_etc_perfconfig(void) |
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{ |
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static const char *system_wide; |
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if (!system_wide) |
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system_wide = system_path(ETC_PERFCONFIG); |
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return system_wide; |
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} |
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static int perf_env_bool(const char *k, int def) |
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{ |
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const char *v = getenv(k); |
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return v ? perf_config_bool(k, v) : def; |
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} |
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int perf_config_system(void) |
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{ |
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return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0); |
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} |
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int perf_config_global(void) |
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{ |
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return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0); |
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} |
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static char *home_perfconfig(void) |
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{ |
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const char *home = NULL; |
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char *config; |
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struct stat st; |
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home = getenv("HOME"); |
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/* |
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* Skip reading user config if: |
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* - there is no place to read it from (HOME) |
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* - we are asked not to (PERF_CONFIG_NOGLOBAL=1) |
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*/ |
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if (!home || !*home || !perf_config_global()) |
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return NULL; |
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config = strdup(mkpath("%s/.perfconfig", home)); |
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if (config == NULL) { |
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pr_warning("Not enough memory to process %s/.perfconfig, ignoring it.", home); |
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return NULL; |
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} |
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if (stat(config, &st) < 0) |
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goto out_free; |
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if (st.st_uid && (st.st_uid != geteuid())) { |
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pr_warning("File %s not owned by current user or root, ignoring it.", config); |
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goto out_free; |
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} |
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if (st.st_size) |
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return config; |
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out_free: |
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free(config); |
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return NULL; |
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} |
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const char *perf_home_perfconfig(void) |
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{ |
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static const char *config; |
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static bool failed; |
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if (failed || config) |
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return config; |
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config = home_perfconfig(); |
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if (!config) |
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failed = true; |
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return config; |
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} |
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static struct perf_config_section *find_section(struct list_head *sections, |
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const char *section_name) |
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{ |
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struct perf_config_section *section; |
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list_for_each_entry(section, sections, node) |
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if (!strcmp(section->name, section_name)) |
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return section; |
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return NULL; |
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} |
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static struct perf_config_item *find_config_item(const char *name, |
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struct perf_config_section *section) |
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{ |
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struct perf_config_item *item; |
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list_for_each_entry(item, §ion->items, node) |
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if (!strcmp(item->name, name)) |
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return item; |
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return NULL; |
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} |
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static struct perf_config_section *add_section(struct list_head *sections, |
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const char *section_name) |
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{ |
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struct perf_config_section *section = zalloc(sizeof(*section)); |
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if (!section) |
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return NULL; |
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INIT_LIST_HEAD(§ion->items); |
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section->name = strdup(section_name); |
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if (!section->name) { |
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pr_debug("%s: strdup failed\n", __func__); |
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free(section); |
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return NULL; |
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} |
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list_add_tail(§ion->node, sections); |
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return section; |
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} |
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static struct perf_config_item *add_config_item(struct perf_config_section *section, |
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const char *name) |
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{ |
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struct perf_config_item *item = zalloc(sizeof(*item)); |
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if (!item) |
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return NULL; |
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item->name = strdup(name); |
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if (!item->name) { |
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pr_debug("%s: strdup failed\n", __func__); |
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free(item); |
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return NULL; |
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} |
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list_add_tail(&item->node, §ion->items); |
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return item; |
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} |
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static int set_value(struct perf_config_item *item, const char *value) |
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{ |
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char *val = strdup(value); |
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|
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if (!val) |
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return -1; |
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zfree(&item->value); |
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item->value = val; |
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return 0; |
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} |
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static int collect_config(const char *var, const char *value, |
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void *perf_config_set) |
|
{ |
|
int ret = -1; |
|
char *ptr, *key; |
|
char *section_name, *name; |
|
struct perf_config_section *section = NULL; |
|
struct perf_config_item *item = NULL; |
|
struct perf_config_set *set = perf_config_set; |
|
struct list_head *sections; |
|
|
|
if (set == NULL) |
|
return -1; |
|
|
|
sections = &set->sections; |
|
key = ptr = strdup(var); |
|
if (!key) { |
|
pr_debug("%s: strdup failed\n", __func__); |
|
return -1; |
|
} |
|
|
|
section_name = strsep(&ptr, "."); |
|
name = ptr; |
|
if (name == NULL || value == NULL) |
|
goto out_free; |
|
|
|
section = find_section(sections, section_name); |
|
if (!section) { |
|
section = add_section(sections, section_name); |
|
if (!section) |
|
goto out_free; |
|
} |
|
|
|
item = find_config_item(name, section); |
|
if (!item) { |
|
item = add_config_item(section, name); |
|
if (!item) |
|
goto out_free; |
|
} |
|
|
|
/* perf_config_set can contain both user and system config items. |
|
* So we should know where each value is from. |
|
* The classification would be needed when a particular config file |
|
* is overwritten by setting feature i.e. set_config(). |
|
*/ |
|
if (strcmp(config_file_name, perf_etc_perfconfig()) == 0) { |
|
section->from_system_config = true; |
|
item->from_system_config = true; |
|
} else { |
|
section->from_system_config = false; |
|
item->from_system_config = false; |
|
} |
|
|
|
ret = set_value(item, value); |
|
|
|
out_free: |
|
free(key); |
|
return ret; |
|
} |
|
|
|
int perf_config_set__collect(struct perf_config_set *set, const char *file_name, |
|
const char *var, const char *value) |
|
{ |
|
config_file_name = file_name; |
|
return collect_config(var, value, set); |
|
} |
|
|
|
static int perf_config_set__init(struct perf_config_set *set) |
|
{ |
|
int ret = -1; |
|
|
|
/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */ |
|
if (config_exclusive_filename) |
|
return perf_config_from_file(collect_config, config_exclusive_filename, set); |
|
if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) { |
|
if (perf_config_from_file(collect_config, perf_etc_perfconfig(), set) < 0) |
|
goto out; |
|
} |
|
if (perf_config_global() && perf_home_perfconfig()) { |
|
if (perf_config_from_file(collect_config, perf_home_perfconfig(), set) < 0) |
|
goto out; |
|
} |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
struct perf_config_set *perf_config_set__new(void) |
|
{ |
|
struct perf_config_set *set = zalloc(sizeof(*set)); |
|
|
|
if (set) { |
|
INIT_LIST_HEAD(&set->sections); |
|
perf_config_set__init(set); |
|
} |
|
|
|
return set; |
|
} |
|
|
|
struct perf_config_set *perf_config_set__load_file(const char *file) |
|
{ |
|
struct perf_config_set *set = zalloc(sizeof(*set)); |
|
|
|
if (set) { |
|
INIT_LIST_HEAD(&set->sections); |
|
perf_config_from_file(collect_config, file, set); |
|
} |
|
|
|
return set; |
|
} |
|
|
|
static int perf_config__init(void) |
|
{ |
|
if (config_set == NULL) |
|
config_set = perf_config_set__new(); |
|
|
|
return config_set == NULL; |
|
} |
|
|
|
int perf_config_set(struct perf_config_set *set, |
|
config_fn_t fn, void *data) |
|
{ |
|
int ret = 0; |
|
char key[BUFSIZ]; |
|
struct perf_config_section *section; |
|
struct perf_config_item *item; |
|
|
|
perf_config_set__for_each_entry(set, section, item) { |
|
char *value = item->value; |
|
|
|
if (value) { |
|
scnprintf(key, sizeof(key), "%s.%s", |
|
section->name, item->name); |
|
ret = fn(key, value, data); |
|
if (ret < 0) { |
|
pr_err("Error in the given config file: wrong config key-value pair %s=%s\n", |
|
key, value); |
|
/* |
|
* Can't be just a 'break', as perf_config_set__for_each_entry() |
|
* expands to two nested for() loops. |
|
*/ |
|
goto out; |
|
} |
|
} |
|
} |
|
out: |
|
return ret; |
|
} |
|
|
|
int perf_config(config_fn_t fn, void *data) |
|
{ |
|
if (config_set == NULL && perf_config__init()) |
|
return -1; |
|
|
|
return perf_config_set(config_set, fn, data); |
|
} |
|
|
|
void perf_config__exit(void) |
|
{ |
|
perf_config_set__delete(config_set); |
|
config_set = NULL; |
|
} |
|
|
|
void perf_config__refresh(void) |
|
{ |
|
perf_config__exit(); |
|
perf_config__init(); |
|
} |
|
|
|
static void perf_config_item__delete(struct perf_config_item *item) |
|
{ |
|
zfree(&item->name); |
|
zfree(&item->value); |
|
free(item); |
|
} |
|
|
|
static void perf_config_section__purge(struct perf_config_section *section) |
|
{ |
|
struct perf_config_item *item, *tmp; |
|
|
|
list_for_each_entry_safe(item, tmp, §ion->items, node) { |
|
list_del_init(&item->node); |
|
perf_config_item__delete(item); |
|
} |
|
} |
|
|
|
static void perf_config_section__delete(struct perf_config_section *section) |
|
{ |
|
perf_config_section__purge(section); |
|
zfree(§ion->name); |
|
free(section); |
|
} |
|
|
|
static void perf_config_set__purge(struct perf_config_set *set) |
|
{ |
|
struct perf_config_section *section, *tmp; |
|
|
|
list_for_each_entry_safe(section, tmp, &set->sections, node) { |
|
list_del_init(§ion->node); |
|
perf_config_section__delete(section); |
|
} |
|
} |
|
|
|
void perf_config_set__delete(struct perf_config_set *set) |
|
{ |
|
if (set == NULL) |
|
return; |
|
|
|
perf_config_set__purge(set); |
|
free(set); |
|
} |
|
|
|
/* |
|
* Call this to report error for your variable that should not |
|
* get a boolean value (i.e. "[my] var" means "true"). |
|
*/ |
|
int config_error_nonbool(const char *var) |
|
{ |
|
pr_err("Missing value for '%s'", var); |
|
return -1; |
|
} |
|
|
|
void set_buildid_dir(const char *dir) |
|
{ |
|
if (dir) |
|
scnprintf(buildid_dir, MAXPATHLEN, "%s", dir); |
|
|
|
/* default to $HOME/.debug */ |
|
if (buildid_dir[0] == '\0') { |
|
char *home = getenv("HOME"); |
|
|
|
if (home) { |
|
snprintf(buildid_dir, MAXPATHLEN, "%s/%s", |
|
home, DEBUG_CACHE_DIR); |
|
} else { |
|
strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1); |
|
} |
|
buildid_dir[MAXPATHLEN-1] = '\0'; |
|
} |
|
/* for communicating with external commands */ |
|
setenv("PERF_BUILDID_DIR", buildid_dir, 1); |
|
}
|
|
|