perf probe: Move add-probe routine to util/

Move add-probe routine to util/probe_event.c. This simplifies
main routine for reducing maintenance cost.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100316220537.32050.72214.stgit@localhost6.localdomain6>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 135 insertions, 2 deletions

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 88a3b6d75c7c..1e60a659578b 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -40,6 +40,8 @@
 #include "debug.h"
 #include "cache.h"
 #include "color.h"
+#include "symbol.h"
+#include "thread.h"
 #include "parse-events.h"  /* For debugfs_path */
 #include "probe-event.h"
 
@@ -65,6 +67,38 @@ static int e_snprintf(char *str, size_t size, const char *format, ...)
         return ret;
 }
 
+
+static struct map_groups kmap_groups;
+static struct map *kmaps[MAP__NR_TYPES];
+
+/* Initialize symbol maps for vmlinux */
+static void init_vmlinux(void)
+{
+        symbol_conf.sort_by_name = true;
+        if (symbol_conf.vmlinux_name == NULL)
+                symbol_conf.try_vmlinux_path = true;
+        else
+                pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
+        if (symbol__init() < 0)
+                die("Failed to init symbol map.");
+
+        map_groups__init(&kmap_groups);
+        if (map_groups__create_kernel_maps(&kmap_groups, kmaps) < 0)
+                die("Failed to create kernel maps.");
+}
+
+#ifndef NO_DWARF_SUPPORT
+static int open_vmlinux(void)
+{
+        if (map__load(kmaps[MAP__FUNCTION], NULL) < 0) {
+                pr_debug("Failed to load kernel map.\n");
+                return -EINVAL;
+        }
+        pr_debug("Try to open %s\n", kmaps[MAP__FUNCTION]->dso->long_name);
+        return open(kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
+}
+#endif
+
 void parse_line_range_desc(const char *arg, struct line_range *lr)
 {
         const char *ptr;
@@ -586,8 +620,8 @@ static void get_new_event_name(char *buf, size_t len, const char *base,
                 die("Too many events are on the same function.");
 }
 
-void add_trace_kprobe_events(struct probe_point *probes, int nr_probes,
-                             bool force_add)
+static void __add_trace_kprobe_events(struct probe_point *probes,
+                                      int nr_probes, bool force_add)
 {
         int i, j, fd;
         struct probe_point *pp;
@@ -640,6 +674,92 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes,
         close(fd);
 }
 
+/* Currently just checking function name from symbol map */
+static void evaluate_probe_point(struct probe_point *pp)
+{
+        struct symbol *sym;
+        sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION],
+                                       pp->function, NULL);
+        if (!sym)
+                die("Kernel symbol \'%s\' not found - probe not added.",
+                    pp->function);
+}
+
+void add_trace_kprobe_events(struct probe_point *probes, int nr_probes,
+                             bool force_add, bool need_dwarf)
+{
+        int i, ret;
+        struct probe_point *pp;
+#ifndef NO_DWARF_SUPPORT
+        int fd;
+#endif
+        /* Add probes */
+        init_vmlinux();
+
+        if (need_dwarf)
+#ifdef NO_DWARF_SUPPORT
+                die("Debuginfo-analysis is not supported");
+#else   /* !NO_DWARF_SUPPORT */
+                pr_debug("Some probes require debuginfo.\n");
+
+        fd = open_vmlinux();
+        if (fd < 0) {
+                if (need_dwarf)
+                        die("Could not open debuginfo file.");
+
+                pr_debug("Could not open vmlinux/module file."
+                         " Try to use symbols.\n");
+                goto end_dwarf;
+        }
+
+        /* Searching probe points */
+        for (i = 0; i < nr_probes; i++) {
+                pp = &probes[i];
+                if (pp->found)
+                        continue;
+
+                lseek(fd, SEEK_SET, 0);
+                ret = find_probe_point(fd, pp);
+                if (ret > 0)
+                        continue;
+                if (ret == 0) { /* No error but failed to find probe point. */
+                        synthesize_perf_probe_point(pp);
+                        die("Probe point '%s' not found. - probe not added.",
+                            pp->probes[0]);
+                }
+                /* Error path */
+                if (need_dwarf) {
+                        if (ret == -ENOENT)
+                                pr_warning("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO=y.\n");
+                        die("Could not analyze debuginfo.");
+                }
+                pr_debug("An error occurred in debuginfo analysis."
+                         " Try to use symbols.\n");
+                break;
+        }
+        close(fd);
+
+end_dwarf:
+#endif /* !NO_DWARF_SUPPORT */
+
+        /* Synthesize probes without dwarf */
+        for (i = 0; i < nr_probes; i++) {
+                pp = &probes[i];
+                if (pp->found)  /* This probe is already found. */
+                        continue;
+
+                evaluate_probe_point(pp);
+                ret = synthesize_trace_kprobe_event(pp);
+                if (ret == -E2BIG)
+                        die("probe point definition becomes too long.");
+                else if (ret < 0)
+                        die("Failed to synthesize a probe point.");
+        }
+
+        /* Settng up probe points */
+        __add_trace_kprobe_events(probes, nr_probes, force_add);
+}
+
 static void __del_trace_kprobe_event(int fd, struct str_node *ent)
 {
         char *p;
@@ -759,6 +879,17 @@ void show_line_range(struct line_range *lr)
         unsigned int l = 1;
         struct line_node *ln;
         FILE *fp;
+        int fd, ret;
+
+        /* Search a line range */
+        init_vmlinux();
+        fd = open_vmlinux();
+        if (fd < 0)
+                die("Could not open debuginfo file.");
+        ret = find_line_range(fd, lr);
+        if (ret <= 0)
+                die("Source line is not found.\n");
+        close(fd);
 
         setup_pager();
 
@@ -788,3 +919,5 @@ void show_line_range(struct line_range *lr)
 
         fclose(fp);
 }
+
+