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Diffstat (limited to 'tools/perf/builtin-probe.c')
-rw-r--r--tools/perf/builtin-probe.c145
1 files changed, 82 insertions, 63 deletions
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 5a47c1e11f77..c1e6774fd3ed 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -38,34 +38,30 @@
#include "util/strlist.h"
#include "util/event.h"
#include "util/debug.h"
+#include "util/debugfs.h"
+#include "util/symbol.h"
+#include "util/thread.h"
+#include "util/session.h"
#include "util/parse-options.h"
#include "util/parse-events.h" /* For debugfs_path */
#include "util/probe-finder.h"
#include "util/probe-event.h"
-/* Default vmlinux search paths */
-#define NR_SEARCH_PATH 4
-const char *default_search_path[NR_SEARCH_PATH] = {
-"/lib/modules/%s/build/vmlinux", /* Custom build kernel */
-"/usr/lib/debug/lib/modules/%s/vmlinux", /* Red Hat debuginfo */
-"/boot/vmlinux-debug-%s", /* Ubuntu */
-"./vmlinux", /* CWD */
-};
-
#define MAX_PATH_LEN 256
#define MAX_PROBES 128
/* Session management structure */
static struct {
- char *vmlinux;
- char *release;
- int need_dwarf;
+ bool need_dwarf;
+ bool list_events;
+ bool force_add;
int nr_probe;
struct probe_point probes[MAX_PROBES];
struct strlist *dellist;
+ struct perf_session *psession;
+ struct map *kmap;
} session;
-static bool listing;
/* Parse an event definition. Note that any error must die. */
static void parse_probe_event(const char *str)
@@ -77,7 +73,7 @@ static void parse_probe_event(const char *str)
die("Too many probes (> %d) are specified.", MAX_PROBES);
/* Parse perf-probe event into probe_point */
- session.need_dwarf = parse_perf_probe_event(str, pp);
+ parse_perf_probe_event(str, pp, &session.need_dwarf);
pr_debug("%d arguments\n", pp->nr_args);
}
@@ -120,34 +116,26 @@ static int opt_del_probe_event(const struct option *opt __used,
return 0;
}
+/* 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(session.kmap, pp->function,
+ session.psession, NULL);
+ if (!sym)
+ die("Kernel symbol \'%s\' not found - probe not added.",
+ pp->function);
+}
+
#ifndef NO_LIBDWARF
-static int open_default_vmlinux(void)
+static int open_vmlinux(void)
{
- struct utsname uts;
- char fname[MAX_PATH_LEN];
- int fd, ret, i;
-
- ret = uname(&uts);
- if (ret) {
- pr_debug("uname() failed.\n");
- return -errno;
- }
- session.release = uts.release;
- for (i = 0; i < NR_SEARCH_PATH; i++) {
- ret = snprintf(fname, MAX_PATH_LEN,
- default_search_path[i], session.release);
- if (ret >= MAX_PATH_LEN || ret < 0) {
- pr_debug("Filename(%d,%s) is too long.\n", i,
- uts.release);
- errno = E2BIG;
- return -E2BIG;
- }
- pr_debug("try to open %s\n", fname);
- fd = open(fname, O_RDONLY);
- if (fd >= 0)
- break;
+ if (map__load(session.kmap, session.psession, NULL) < 0) {
+ pr_debug("Failed to load kernel map.\n");
+ return -EINVAL;
}
- return fd;
+ pr_debug("Try to open %s\n", session.kmap->dso->long_name);
+ return open(session.kmap->dso->long_name, O_RDONLY);
}
#endif
@@ -163,21 +151,22 @@ static const struct option options[] = {
OPT_BOOLEAN('v', "verbose", &verbose,
"be more verbose (show parsed arguments, etc)"),
#ifndef NO_LIBDWARF
- OPT_STRING('k', "vmlinux", &session.vmlinux, "file",
- "vmlinux/module pathname"),
+ OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
+ "file", "vmlinux pathname"),
#endif
- OPT_BOOLEAN('l', "list", &listing, "list up current probe events"),
+ OPT_BOOLEAN('l', "list", &session.list_events,
+ "list up current probe events"),
OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
opt_del_probe_event),
OPT_CALLBACK('a', "add", NULL,
#ifdef NO_LIBDWARF
- "FUNC[+OFFS|%return] [ARG ...]",
+ "[EVENT=]FUNC[+OFFS|%return] [ARG ...]",
#else
- "FUNC[+OFFS|%return|:RLN][@SRC]|SRC:ALN [ARG ...]",
+ "[EVENT=]FUNC[+OFFS|%return|:RLN][@SRC]|SRC:ALN [ARG ...]",
#endif
"probe point definition, where\n"
- "\t\tGRP:\tGroup name (optional)\n"
- "\t\tNAME:\tEvent name\n"
+ "\t\tGROUP:\tGroup name (optional)\n"
+ "\t\tEVENT:\tEvent name\n"
"\t\tFUNC:\tFunction name\n"
"\t\tOFFS:\tOffset from function entry (in byte)\n"
"\t\t%return:\tPut the probe at function return\n"
@@ -191,6 +180,8 @@ static const struct option options[] = {
#endif
"\t\t\tkprobe-tracer argument format.)\n",
opt_add_probe_event),
+ OPT_BOOLEAN('f', "force", &session.force_add, "forcibly add events"
+ " with existing name"),
OPT_END()
};
@@ -204,13 +195,21 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
argc = parse_options(argc, argv, options, probe_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
- if (argc > 0)
+ if (argc > 0) {
+ if (strcmp(argv[0], "-") == 0) {
+ pr_warning(" Error: '-' is not supported.\n");
+ usage_with_options(probe_usage, options);
+ }
parse_probe_event_argv(argc, argv);
+ }
- if ((session.nr_probe == 0 && !session.dellist && !listing))
+ if ((!session.nr_probe && !session.dellist && !session.list_events))
usage_with_options(probe_usage, options);
- if (listing) {
+ if (debugfs_valid_mountpoint(debugfs_path) < 0)
+ die("Failed to find debugfs path.");
+
+ if (session.list_events) {
if (session.nr_probe != 0 || session.dellist) {
pr_warning(" Error: Don't use --list with"
" --add/--del.\n");
@@ -227,17 +226,28 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
return 0;
}
+ /* Initialize symbol maps for vmlinux */
+ symbol_conf.sort_by_name = true;
+ if (symbol_conf.vmlinux_name == NULL)
+ symbol_conf.try_vmlinux_path = true;
+ if (symbol__init() < 0)
+ die("Failed to init symbol map.");
+ session.psession = perf_session__new(NULL, O_WRONLY, false);
+ if (session.psession == NULL)
+ die("Failed to init perf_session.");
+ session.kmap = map_groups__find_by_name(&session.psession->kmaps,
+ MAP__FUNCTION,
+ "[kernel.kallsyms]");
+ if (!session.kmap)
+ die("Could not find kernel map.\n");
+
if (session.need_dwarf)
#ifdef NO_LIBDWARF
die("Debuginfo-analysis is not supported");
#else /* !NO_LIBDWARF */
pr_debug("Some probes require debuginfo.\n");
- if (session.vmlinux) {
- pr_debug("Try to open %s.", session.vmlinux);
- fd = open(session.vmlinux, O_RDONLY);
- } else
- fd = open_default_vmlinux();
+ fd = open_vmlinux();
if (fd < 0) {
if (session.need_dwarf)
die("Could not open debuginfo file.");
@@ -255,15 +265,22 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
lseek(fd, SEEK_SET, 0);
ret = find_probepoint(fd, pp);
- if (ret < 0) {
- if (session.need_dwarf)
- die("Could not analyze debuginfo.");
-
- pr_warning("An error occurred in debuginfo analysis. Try to use symbols.\n");
- break;
+ 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]);
}
- if (ret == 0) /* No error but failed to find probe point. */
- die("No probe point found.");
+ /* Error path */
+ if (session.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);
@@ -276,6 +293,7 @@ end_dwarf:
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.");
@@ -284,7 +302,8 @@ end_dwarf:
}
/* Settng up probe points */
- add_trace_kprobe_events(session.probes, session.nr_probe);
+ add_trace_kprobe_events(session.probes, session.nr_probe,
+ session.force_add);
return 0;
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-17 11:55:18 +0300