1 #include <linux/kernel.h> 2 3 #include <unistd.h> 4 #include <sys/types.h> 5 6 #include "session.h" 7 #include "sort.h" 8 #include "util.h" 9 10 static int perf_session__open(struct perf_session *self, bool force) 11 { 12 struct stat input_stat; 13 14 self->fd = open(self->filename, O_RDONLY); 15 if (self->fd < 0) { 16 pr_err("failed to open file: %s", self->filename); 17 if (!strcmp(self->filename, "perf.data")) 18 pr_err(" (try 'perf record' first)"); 19 pr_err("\n"); 20 return -errno; 21 } 22 23 if (fstat(self->fd, &input_stat) < 0) 24 goto out_close; 25 26 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { 27 pr_err("file %s not owned by current user or root\n", 28 self->filename); 29 goto out_close; 30 } 31 32 if (!input_stat.st_size) { 33 pr_info("zero-sized file (%s), nothing to do!\n", 34 self->filename); 35 goto out_close; 36 } 37 38 if (perf_header__read(&self->header, self->fd) < 0) { 39 pr_err("incompatible file format"); 40 goto out_close; 41 } 42 43 self->size = input_stat.st_size; 44 return 0; 45 46 out_close: 47 close(self->fd); 48 self->fd = -1; 49 return -1; 50 } 51 52 struct perf_session *perf_session__new(const char *filename, int mode, bool force) 53 { 54 size_t len = filename ? strlen(filename) + 1 : 0; 55 struct perf_session *self = zalloc(sizeof(*self) + len); 56 57 if (self == NULL) 58 goto out; 59 60 if (perf_header__init(&self->header) < 0) 61 goto out_free; 62 63 memcpy(self->filename, filename, len); 64 self->threads = RB_ROOT; 65 self->last_match = NULL; 66 self->mmap_window = 32; 67 self->cwd = NULL; 68 self->cwdlen = 0; 69 map_groups__init(&self->kmaps); 70 71 if (perf_session__create_kernel_maps(self) < 0) 72 goto out_delete; 73 74 if (mode == O_RDONLY && perf_session__open(self, force) < 0) 75 goto out_delete; 76 out: 77 return self; 78 out_free: 79 free(self); 80 return NULL; 81 out_delete: 82 perf_session__delete(self); 83 return NULL; 84 } 85 86 void perf_session__delete(struct perf_session *self) 87 { 88 perf_header__exit(&self->header); 89 close(self->fd); 90 free(self->cwd); 91 free(self); 92 } 93 94 static bool symbol__match_parent_regex(struct symbol *sym) 95 { 96 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 97 return 1; 98 99 return 0; 100 } 101 102 struct symbol **perf_session__resolve_callchain(struct perf_session *self, 103 struct thread *thread, 104 struct ip_callchain *chain, 105 struct symbol **parent) 106 { 107 u8 cpumode = PERF_RECORD_MISC_USER; 108 struct symbol **syms = NULL; 109 unsigned int i; 110 111 if (self->use_callchain) { 112 syms = calloc(chain->nr, sizeof(*syms)); 113 if (!syms) { 114 fprintf(stderr, "Can't allocate memory for symbols\n"); 115 exit(-1); 116 } 117 } 118 119 for (i = 0; i < chain->nr; i++) { 120 u64 ip = chain->ips[i]; 121 struct addr_location al; 122 123 if (ip >= PERF_CONTEXT_MAX) { 124 switch (ip) { 125 case PERF_CONTEXT_HV: 126 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 127 case PERF_CONTEXT_KERNEL: 128 cpumode = PERF_RECORD_MISC_KERNEL; break; 129 case PERF_CONTEXT_USER: 130 cpumode = PERF_RECORD_MISC_USER; break; 131 default: 132 break; 133 } 134 continue; 135 } 136 137 thread__find_addr_location(thread, self, cpumode, 138 MAP__FUNCTION, ip, &al, NULL); 139 if (al.sym != NULL) { 140 if (sort__has_parent && !*parent && 141 symbol__match_parent_regex(al.sym)) 142 *parent = al.sym; 143 if (!self->use_callchain) 144 break; 145 syms[i] = al.sym; 146 } 147 } 148 149 return syms; 150 } 151