perf symbols: Add symfs option for off-box analysis using specified tree

[firefly-linux-kernel-4.4.55.git] / tools / perf / util / symbol.c

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index ceefa6568def788d4495b815a953b3b2d8dd1fe9..561db6361f57a3f42e1af978f8006ae7657469bc 100644 (file)
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -41,6 +41,7 @@ struct symbol_conf symbol_conf = {
        .exclude_other    = true,
        .use_modules      = true,
        .try_vmlinux_path = true,
+       .symfs            = "",
 };
 
 int dso__name_len(const struct dso *self)
@@ -839,8 +840,11 @@ static int dso__synthesize_plt_symbols(struct  dso *self, struct map *map,
        char sympltname[1024];
        Elf *elf;
        int nr = 0, symidx, fd, err = 0;
+       char name[PATH_MAX];
 
-       fd = open(self->long_name, O_RDONLY);
+       snprintf(name, sizeof(name), "%s%s",
+                symbol_conf.symfs, self->long_name);
+       fd = open(name, O_RDONLY);
        if (fd < 0)
                goto out;
 
@@ -1452,16 +1456,19 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
             self->origin++) {
                switch (self->origin) {
                case DSO__ORIG_BUILD_ID_CACHE:
-                       if (dso__build_id_filename(self, name, size) == NULL)
+                       /* skip the locally configured cache if a symfs is given */
+                       if (symbol_conf.symfs[0] ||
+                           (dso__build_id_filename(self, name, size) == NULL)) {
                                continue;
+                       }
                        break;
                case DSO__ORIG_FEDORA:
-                       snprintf(name, size, "/usr/lib/debug%s.debug",
-                                self->long_name);
+                       snprintf(name, size, "%s/usr/lib/debug%s.debug",
+                                symbol_conf.symfs, self->long_name);
                        break;
                case DSO__ORIG_UBUNTU:
-                       snprintf(name, size, "/usr/lib/debug%s",
-                                self->long_name);
+                       snprintf(name, size, "%s/usr/lib/debug%s",
+                                symbol_conf.symfs, self->long_name);
                        break;
                case DSO__ORIG_BUILDID: {
                        char build_id_hex[BUILD_ID_SIZE * 2 + 1];
@@ -1473,19 +1480,26 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
                                          sizeof(self->build_id),
                                          build_id_hex);
                        snprintf(name, size,
-                                "/usr/lib/debug/.build-id/%.2s/%s.debug",
-                                build_id_hex, build_id_hex + 2);
+                                "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
+                                symbol_conf.symfs, build_id_hex, build_id_hex + 2);
                        }
                        break;
                case DSO__ORIG_DSO:
-                       snprintf(name, size, "%s", self->long_name);
+                       snprintf(name, size, "%s%s",
+                            symbol_conf.symfs, self->long_name);
                        break;
                case DSO__ORIG_GUEST_KMODULE:
                        if (map->groups && map->groups->machine)
                                root_dir = map->groups->machine->root_dir;
                        else
                                root_dir = "";
-                       snprintf(name, size, "%s%s", root_dir, self->long_name);
+                       snprintf(name, size, "%s%s%s", symbol_conf.symfs,
+                                root_dir, self->long_name);
+                       break;
+
+               case DSO__ORIG_KMODULE:
+                       snprintf(name, size, "%s%s", symbol_conf.symfs,
+                                self->long_name);
                        break;
 
                default:
@@ -1784,17 +1798,20 @@ static int dso__load_vmlinux(struct dso *self, struct map *map,
                             const char *vmlinux, symbol_filter_t filter)
 {
        int err = -1, fd;
+       char symfs_vmlinux[PATH_MAX];
 
-       fd = open(vmlinux, O_RDONLY);
+       snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s/%s",
+                symbol_conf.symfs, vmlinux);
+       fd = open(symfs_vmlinux, O_RDONLY);
        if (fd < 0)
                return -1;
 
        dso__set_loaded(self, map->type);
-       err = dso__load_sym(self, map, vmlinux, fd, filter, 0, 0);
+       err = dso__load_sym(self, map, symfs_vmlinux, fd, filter, 0, 0);
        close(fd);
 
        if (err > 0)
-               pr_debug("Using %s for symbols\n", vmlinux);
+               pr_debug("Using %s for symbols\n", symfs_vmlinux);
 
        return err;
 }
@@ -1872,6 +1889,10 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
                        goto out_fixup;
        }
 
+       /* do not try local files if a symfs was given */
+       if (symbol_conf.symfs[0] != 0)
+               return -1;
+
        /*
         * Say the kernel DSO was created when processing the build-id header table,
         * we have a build-id, so check if it is the same as the running kernel,
@@ -2262,9 +2283,6 @@ static int vmlinux_path__init(void)
        struct utsname uts;
        char bf[PATH_MAX];
 
-       if (uname(&uts) < 0)
-               return -1;
-
        vmlinux_path = malloc(sizeof(char *) * 5);
        if (vmlinux_path == NULL)
                return -1;
@@ -2277,6 +2295,14 @@ static int vmlinux_path__init(void)
        if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
                goto out_fail;
        ++vmlinux_path__nr_entries;
+
+       /* only try running kernel version if no symfs was given */
+       if (symbol_conf.symfs[0] != 0)
+               return 0;
+
+       if (uname(&uts) < 0)
+               return -1;
+
        snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
        vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
        if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
@@ -2336,6 +2362,8 @@ static int setup_list(struct strlist **list, const char *list_str,
 
 int symbol__init(void)
 {
+       const char *symfs;
+
        if (symbol_conf.initialized)
                return 0;
 
@@ -2364,6 +2392,18 @@ int symbol__init(void)
                       symbol_conf.sym_list_str, "symbol") < 0)
                goto out_free_comm_list;
 
+       /*
+        * A path to symbols of "/" is identical to ""
+        * reset here for simplicity.
+        */
+       symfs = realpath(symbol_conf.symfs, NULL);
+       if (symfs == NULL)
+               symfs = symbol_conf.symfs;
+       if (strcmp(symfs, "/") == 0)
+               symbol_conf.symfs = "";
+       if (symfs != symbol_conf.symfs)
+               free((void *)symfs);
+
        symbol_conf.initialized = true;
        return 0;