perf probe: Fall back to debuginfod query if debuginfo and source not found locally

Since 'perf probe' heavily depends on debuginfo, debuginfod gives us
many benefits on the 'perf probe' command on remote machine.

Especially, this will be helpful for the embedded devices which will not
have enough storage, or boot with a cross-build kernel whose source code
is in the host machine.

This will work as similar to commit c7a14fdc ("perf build-ids:
Fall back to debuginfod query if debuginfo not found")

Tested with:

  (host) $ cd PATH/TO/KBUILD/DIR/
  (host) $ debuginfod -F .
  ...

  (remote) # perf probe -L vfs_read
  Failed to find the path for the kernel: No such file or directory
    Error: Failed to show lines.

  (remote) # export DEBUGINFOD_URLS="http://$HOST_IP:8002/"
  (remote) # perf probe -L vfs_read
  <vfs_read@...>
        0  ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
           {
        2         ssize_t ret;

                  if (!(file->f_mode & FMODE_READ))
                          return -EBADF;
        6         if (!(file->f_mode & FMODE_CAN_READ))
                          return -EINVAL;
        8         if (unlikely(!access_ok(buf, count)))
                          return -EFAULT;

       11         ret = rw_verify_area(READ, file, pos, count);
       12         if (ret)
                          return ret;
                  if (count > MAX_RW_COUNT)
  ...

  (remote) # perf probe -a "vfs_read count"
  Added new event:
    probe:vfs_read       (on vfs_read with count)

  (remote) # perf probe -l
    probe:vfs_read       (on vfs_read@ksrc/linux/fs/read_write.c with count)
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Frank Ch. Eigler <fche@redhat.com>
Cc: Aaron Merey <amerey@redhat.com>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Link: http://lore.kernel.org/lkml/160041610083.912668.13659563860278615846.stgit@devnote2Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/probe-event.c

@@ -43,6 +43,10 @@
 #include <linux/ctype.h>
 #include <linux/zalloc.h>
 
+#ifdef HAVE_DEBUGINFOD_SUPPORT
+#include <elfutils/debuginfod.h>
+#endif
+
 #define PERFPROBE_GROUP "probe"
 
 bool probe_event_dry_run;	/* Dry run flag */
@@ -338,6 +342,8 @@ static int kernel_get_module_dso(const char *module, struct dso **pdso)
 
 	map = machine__kernel_map(host_machine);
 	dso = map->dso;
+	if (!dso->has_build_id)
+		dso__read_running_kernel_build_id(dso, host_machine);
 
 	vmlinux_name = symbol_conf.vmlinux_name;
 	dso->load_errno = 0;
@@ -453,6 +459,49 @@ static int get_alternative_line_range(struct debuginfo *dinfo,
 	return ret;
 }
 
+#ifdef HAVE_DEBUGINFOD_SUPPORT
+static struct debuginfo *open_from_debuginfod(struct dso *dso, struct nsinfo *nsi,
+					      bool silent)
+{
+	debuginfod_client *c = debuginfod_begin();
+	char sbuild_id[SBUILD_ID_SIZE + 1];
+	struct debuginfo *ret = NULL;
+	struct nscookie nsc;
+	char *path;
+	int fd;
+
+	if (!c)
+		return NULL;
+
+	build_id__sprintf(dso->build_id, BUILD_ID_SIZE, sbuild_id);
+	fd = debuginfod_find_debuginfo(c, (const unsigned char *)sbuild_id,
+					0, &path);
+	if (fd >= 0)
+		close(fd);
+	debuginfod_end(c);
+	if (fd < 0) {
+		if (!silent)
+			pr_debug("Failed to find debuginfo in debuginfod.\n");
+		return NULL;
+	}
+	if (!silent)
+		pr_debug("Load debuginfo from debuginfod (%s)\n", path);
+
+	nsinfo__mountns_enter(nsi, &nsc);
+	ret = debuginfo__new((const char *)path);
+	nsinfo__mountns_exit(&nsc);
+	return ret;
+}
+#else
+static inline
+struct debuginfo *open_from_debuginfod(struct dso *dso __maybe_unused,
+				       struct nsinfo *nsi __maybe_unused,
+				       bool silent __maybe_unused)
+{
+	return NULL;
+}
+#endif
+
 /* Open new debuginfo of given module */
 static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
 					bool silent)
@@ -472,6 +521,10 @@ static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
 					strcpy(reason, "(unknown)");
 			} else
 				dso__strerror_load(dso, reason, STRERR_BUFSIZE);
+			if (dso)
+				ret = open_from_debuginfod(dso, nsi, silent);
+			if (ret)
+				return ret;
 			if (!silent) {
 				if (module)
 					pr_err("Module %s is not loaded, please specify its full path name.\n", module);
@@ -959,6 +1012,7 @@ static int __show_line_range(struct line_range *lr, const char *module,
 	int ret;
 	char *tmp;
 	char sbuf[STRERR_BUFSIZE];
+	char sbuild_id[SBUILD_ID_SIZE] = "";
 
 	/* Search a line range */
 	dinfo = open_debuginfo(module, NULL, false);
@@ -971,6 +1025,8 @@ static int __show_line_range(struct line_range *lr, const char *module,
 		if (!ret)
 			ret = debuginfo__find_line_range(dinfo, lr);
 	}
+	if (dinfo->build_id)
+		build_id__sprintf(dinfo->build_id, BUILD_ID_SIZE, sbuild_id);
 	debuginfo__delete(dinfo);
 	if (ret == 0 || ret == -ENOENT) {
 		pr_warning("Specified source line is not found.\n");
@@ -982,7 +1038,7 @@ static int __show_line_range(struct line_range *lr, const char *module,
 
 	/* Convert source file path */
 	tmp = lr->path;
-	ret = get_real_path(tmp, lr->comp_dir, &lr->path);
+	ret = find_source_path(tmp, sbuild_id, lr->comp_dir, &lr->path);
 
 	/* Free old path when new path is assigned */
 	if (tmp != lr->path)

tools/perf/util/probe-finder.c

@@ -31,6 +31,10 @@
 #include "probe-file.h"
 #include "string2.h"
 
+#ifdef HAVE_DEBUGINFOD_SUPPORT
+#include <elfutils/debuginfod.h>
+#endif
+
 /* Kprobe tracer basic type is up to u64 */
 #define MAX_BASIC_TYPE_BITS	64
 
@@ -51,6 +55,7 @@ static const Dwfl_Callbacks offline_callbacks = {
 static int debuginfo__init_offline_dwarf(struct debuginfo *dbg,
 					 const char *path)
 {
+	GElf_Addr dummy;
 	int fd;
 
 	fd = open(path, O_RDONLY);
@@ -70,6 +75,8 @@ static int debuginfo__init_offline_dwarf(struct debuginfo *dbg,
 	if (!dbg->dbg)
 		goto error;
 
+	dwfl_module_build_id(dbg->mod, &dbg->build_id, &dummy);
+
 	dwfl_report_end(dbg->dwfl, NULL, NULL);
 
 	return 0;
@@ -942,6 +949,7 @@ static int probe_point_lazy_walker(const char *fname, int lineno,
 /* Find probe points from lazy pattern  */
 static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
 {
+	char sbuild_id[SBUILD_ID_SIZE] = "";
 	int ret = 0;
 	char *fpath;
 
@@ -949,7 +957,10 @@ static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
 		const char *comp_dir;
 
 		comp_dir = cu_get_comp_dir(&pf->cu_die);
-		ret = get_real_path(pf->fname, comp_dir, &fpath);
+		if (pf->dbg->build_id)
+			build_id__sprintf(pf->dbg->build_id,
+					BUILD_ID_SIZE, sbuild_id);
+		ret = find_source_path(pf->fname, sbuild_id, comp_dir, &fpath);
 		if (ret < 0) {
 			pr_warning("Failed to find source file path.\n");
 			return ret;
@@ -1448,7 +1459,7 @@ int debuginfo__find_trace_events(struct debuginfo *dbg,
 				 struct probe_trace_event **tevs)
 {
 	struct trace_event_finder tf = {
-			.pf = {.pev = pev, .callback = add_probe_trace_event},
+			.pf = {.pev = pev, .dbg = dbg, .callback = add_probe_trace_event},
 			.max_tevs = probe_conf.max_probes, .mod = dbg->mod};
 	int ret, i;
 
@@ -1618,7 +1629,7 @@ int debuginfo__find_available_vars_at(struct debuginfo *dbg,
 				      struct variable_list **vls)
 {
 	struct available_var_finder af = {
-			.pf = {.pev = pev, .callback = add_available_vars},
+			.pf = {.pev = pev, .dbg = dbg, .callback = add_available_vars},
 			.mod = dbg->mod,
 			.max_vls = probe_conf.max_probes};
 	int ret;
@@ -1973,17 +1984,57 @@ int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr)
 	return (ret < 0) ? ret : lf.found;
 }
 
+#ifdef HAVE_DEBUGINFOD_SUPPORT
+/* debuginfod doesn't require the comp_dir but buildid is required */
+static int get_source_from_debuginfod(const char *raw_path,
+				const char *sbuild_id, char **new_path)
+{
+	debuginfod_client *c = debuginfod_begin();
+	const char *p = raw_path;
+	int fd;
+
+	if (!c)
+		return -ENOMEM;
+
+	fd = debuginfod_find_source(c, (const unsigned char *)sbuild_id,
+				0, p, new_path);
+	pr_debug("Search %s from debuginfod -> %d\n", p, fd);
+	if (fd >= 0)
+		close(fd);
+	debuginfod_end(c);
+	if (fd < 0) {
+		pr_debug("Failed to find %s in debuginfod (%s)\n",
+			raw_path, sbuild_id);
+		return -ENOENT;
+	}
+	pr_debug("Got a source %s\n", *new_path);
+
+	return 0;
+}
+#else
+static inline int get_source_from_debuginfod(const char *raw_path __maybe_unused,
+				const char *sbuild_id __maybe_unused,
+				char **new_path __maybe_unused)
+{
+	return -ENOTSUP;
+}
+#endif
 /*
  * Find a src file from a DWARF tag path. Prepend optional source path prefix
  * and chop off leading directories that do not exist. Result is passed back as
  * a newly allocated path on success.
  * Return 0 if file was found and readable, -errno otherwise.
  */
-int get_real_path(const char *raw_path, const char *comp_dir,
-			 char **new_path)
+int find_source_path(const char *raw_path, const char *sbuild_id,
+		const char *comp_dir, char **new_path)
 {
 	const char *prefix = symbol_conf.source_prefix;
 
+	if (sbuild_id && !prefix) {
+		if (!get_source_from_debuginfod(raw_path, sbuild_id, new_path))
+			return 0;
+	}
+
 	if (!prefix) {
 		if (raw_path[0] != '/' && comp_dir)
 			/* If not an absolute path, try to use comp_dir */

tools/perf/util/probe-finder.h

@@ -4,6 +4,7 @@
 
 #include <stdbool.h>
 #include "intlist.h"
+#include "build-id.h"
 #include "probe-event.h"
 #include <linux/ctype.h>
 
@@ -32,6 +33,7 @@ struct debuginfo {
 	Dwfl_Module	*mod;
 	Dwfl		*dwfl;
 	Dwarf_Addr	bias;
+	const unsigned char	*build_id;
 };
 
 /* This also tries to open distro debuginfo */
@@ -59,11 +61,12 @@ int debuginfo__find_available_vars_at(struct debuginfo *dbg,
 				      struct variable_list **vls);
 
 /* Find a src file from a DWARF tag path */
-int get_real_path(const char *raw_path, const char *comp_dir,
-			 char **new_path);
+int find_source_path(const char *raw_path, const char *sbuild_id,
+		     const char *comp_dir, char **new_path);
 
 struct probe_finder {
 	struct perf_probe_event	*pev;		/* Target probe event */
+	struct debuginfo	*dbg;
 
 	/* Callback when a probe point is found */
 	int (*callback)(Dwarf_Die *sc_die, struct probe_finder *pf);