tools/perf/util/session.c

   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,
  53                                        bool force, struct symbol_conf *conf)
  54 {
  55         size_t len = filename ? strlen(filename) + 1 : 0;
  56         struct perf_session *self = zalloc(sizeof(*self) + len);
  57
  58         if (self == NULL)
  59                 goto out;
  60
  61         if (perf_header__init(&self->header) < 0)
  62                 goto out_free;
  63
  64         memcpy(self->filename, filename, len);
  65         self->threads = RB_ROOT;
  66         self->last_match = NULL;
  67         self->mmap_window = 32;
  68         self->cwd = NULL;
  69         self->cwdlen = 0;
  70         map_groups__init(&self->kmaps);
  71
  72         if (perf_session__create_kernel_maps(self, conf) < 0)
  73                 goto out_delete;
  74
  75         if (mode == O_RDONLY && perf_session__open(self, force) < 0)
  76                 goto out_delete;
  77 out:
  78         return self;
  79 out_free:
  80         free(self);
  81         return NULL;
  82 out_delete:
  83         perf_session__delete(self);
  84         return NULL;
  85 }
  86
  87 void perf_session__delete(struct perf_session *self)
  88 {
  89         perf_header__exit(&self->header);
  90         close(self->fd);
  91         free(self->cwd);
  92         free(self);
  93 }
  94
  95 static bool symbol__match_parent_regex(struct symbol *sym)
  96 {
  97         if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
  98                 return 1;
  99
 100         return 0;
 101 }
 102
 103 struct symbol **perf_session__resolve_callchain(struct perf_session *self,
 104                                                 struct thread *thread,
 105                                                 struct ip_callchain *chain,
 106                                                 struct symbol **parent)
 107 {
 108         u8 cpumode = PERF_RECORD_MISC_USER;
 109         struct symbol **syms = NULL;
 110         unsigned int i;
 111
 112         if (self->use_callchain) {
 113                 syms = calloc(chain->nr, sizeof(*syms));
 114                 if (!syms) {
 115                         fprintf(stderr, "Can't allocate memory for symbols\n");
 116                         exit(-1);
 117                 }
 118         }
 119
 120         for (i = 0; i < chain->nr; i++) {
 121                 u64 ip = chain->ips[i];
 122                 struct addr_location al;
 123
 124                 if (ip >= PERF_CONTEXT_MAX) {
 125                         switch (ip) {
 126                         case PERF_CONTEXT_HV:
 127                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;  break;
 128                         case PERF_CONTEXT_KERNEL:
 129                                 cpumode = PERF_RECORD_MISC_KERNEL;      break;
 130                         case PERF_CONTEXT_USER:
 131                                 cpumode = PERF_RECORD_MISC_USER;        break;
 132                         default:
 133                                 break;
 134                         }
 135                         continue;
 136                 }
 137
 138                 thread__find_addr_location(thread, self, cpumode,
 139                                            MAP__FUNCTION, ip, &al, NULL);
 140                 if (al.sym != NULL) {
 141                         if (sort__has_parent && !*parent &&
 142                             symbol__match_parent_regex(al.sym))
 143                                 *parent = al.sym;
 144                         if (!self->use_callchain)
 145                                 break;
 146                         syms[i] = al.sym;
 147                 }
 148         }
 149
 150         return syms;
 151 }