---

yaml
---
r: 205266
b: refs/heads/master
c: 9ed7e1b
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: cfc21cc641dae17a4ebda29ed093134358449577
+refs/heads/master: 9ed7e1b85cd55dc46cb9410a23086bdaa2ff3eb9

trunk/tools/perf/Documentation/perf-probe.txt

@@ -31,6 +31,10 @@ OPTIONS
 --vmlinux=PATH::
 	Specify vmlinux path which has debuginfo (Dwarf binary).
 
+-s::
+--source=PATH::
+	Specify path to kernel source.
+
 -v::
 --verbose::
         Be more verbose (show parsed arguments, etc).

trunk/tools/perf/builtin-probe.c

@@ -182,6 +182,8 @@ static const struct option options[] = {
 		     "Show source code lines.", opt_show_lines),
 	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
 		   "file", "vmlinux pathname"),
+	OPT_STRING('s', "source", &symbol_conf.source_prefix,
+		   "directory", "path to kernel source"),
 #endif
 	OPT__DRY_RUN(&probe_event_dry_run),
 	OPT_INTEGER('\0', "max-probes", &params.max_probe_points,

trunk/tools/perf/util/probe-finder.c

@@ -37,6 +37,7 @@
 #include "event.h"
 #include "debug.h"
 #include "util.h"
+#include "symbol.h"
 #include "probe-finder.h"
 
 /* Kprobe tracer basic type is up to u64 */
@@ -57,6 +58,55 @@ static int strtailcmp(const char *s1, const char *s2)
 	return 0;
 }
 
+/*
+ * 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.
+ */
+static int get_real_path(const char *raw_path, char **new_path)
+{
+	if (!symbol_conf.source_prefix) {
+		if (access(raw_path, R_OK) == 0) {
+			*new_path = strdup(raw_path);
+			return 0;
+		} else
+			return -errno;
+	}
+
+	*new_path = malloc((strlen(symbol_conf.source_prefix) +
+			    strlen(raw_path) + 2));
+	if (!*new_path)
+		return -ENOMEM;
+
+	for (;;) {
+		sprintf(*new_path, "%s/%s", symbol_conf.source_prefix,
+			raw_path);
+
+		if (access(*new_path, R_OK) == 0)
+			return 0;
+
+		switch (errno) {
+		case ENAMETOOLONG:
+		case ENOENT:
+		case EROFS:
+		case EFAULT:
+			raw_path = strchr(++raw_path, '/');
+			if (!raw_path) {
+				free(*new_path);
+				*new_path = NULL;
+				return -ENOENT;
+			}
+			continue;
+
+		default:
+			free(*new_path);
+			*new_path = NULL;
+			return -errno;
+		}
+	}
+}
+
 /* Line number list operations */
 
 /* Add a line to line number list */
@@ -1096,11 +1146,13 @@ int find_perf_probe_point(int fd, unsigned long addr,
 static int line_range_add_line(const char *src, unsigned int lineno,
 			       struct line_range *lr)
 {
+	int ret;
+
 	/* Copy real path */
 	if (!lr->path) {
-		lr->path = strdup(src);
-		if (lr->path == NULL)
-			return -ENOMEM;
+		ret = get_real_path(src, &lr->path);
+		if (ret != 0)
+			return ret;
 	}
 	return line_list__add_line(&lr->line_list, lineno);
 }

trunk/tools/perf/util/symbol.h

@@ -71,6 +71,7 @@ struct symbol_conf {
 			full_paths,
 			show_cpu_utilization;
 	const char	*vmlinux_name,
+			*source_prefix,
 			*field_sep;
 	const char	*default_guest_vmlinux_name,
 			*default_guest_kallsyms,