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Diffstat (limited to 'tools/perf/util/probe-event.c')
-rw-r--r--tools/perf/util/probe-event.c222
1 files changed, 156 insertions, 66 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index d14a458..29465d4 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -62,6 +62,18 @@ static int e_snprintf(char *str, size_t size, const char *format, ...)
return ret;
}
+/* Check the name is good for event/group */
+static bool check_event_name(const char *name)
+{
+ if (!isalpha(*name) && *name != '_')
+ return false;
+ while (*++name != '\0') {
+ if (!isalpha(*name) && !isdigit(*name) && *name != '_')
+ return false;
+ }
+ return true;
+}
+
/* Parse probepoint definition. */
static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
{
@@ -69,10 +81,26 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
char c, nc = 0;
/*
* <Syntax>
- * perf probe SRC:LN
- * perf probe FUNC[+OFFS|%return][@SRC]
+ * perf probe [EVENT=]SRC:LN
+ * perf probe [EVENT=]FUNC[+OFFS|%return][@SRC]
+ *
+ * TODO:Group name support
*/
+ ptr = strchr(arg, '=');
+ if (ptr) { /* Event name */
+ *ptr = '\0';
+ tmp = ptr + 1;
+ ptr = strchr(arg, ':');
+ if (ptr) /* Group name is not supported yet. */
+ semantic_error("Group name is not supported yet.");
+ if (!check_event_name(arg))
+ semantic_error("%s is bad for event name -it must "
+ "follow C symbol-naming rule.", arg);
+ pp->event = strdup(arg);
+ arg = tmp;
+ }
+
ptr = strpbrk(arg, ":+@%");
if (ptr) {
nc = *ptr;
@@ -150,10 +178,13 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
}
/* Parse perf-probe event definition */
-int parse_perf_probe_event(const char *str, struct probe_point *pp)
+void parse_perf_probe_event(const char *str, struct probe_point *pp,
+ bool *need_dwarf)
{
char **argv;
- int argc, i, need_dwarf = 0;
+ int argc, i;
+
+ *need_dwarf = false;
argv = argv_split(str, &argc);
if (!argv)
@@ -164,7 +195,7 @@ int parse_perf_probe_event(const char *str, struct probe_point *pp)
/* Parse probe point */
parse_perf_probe_probepoint(argv[0], pp);
if (pp->file || pp->line)
- need_dwarf = 1;
+ *need_dwarf = true;
/* Copy arguments and ensure return probe has no C argument */
pp->nr_args = argc - 1;
@@ -177,17 +208,15 @@ int parse_perf_probe_event(const char *str, struct probe_point *pp)
if (pp->retprobe)
semantic_error("You can't specify local"
" variable for kretprobe");
- need_dwarf = 1;
+ *need_dwarf = true;
}
}
argv_free(argv);
- return need_dwarf;
}
/* Parse kprobe_events event into struct probe_point */
-void parse_trace_kprobe_event(const char *str, char **group, char **event,
- struct probe_point *pp)
+void parse_trace_kprobe_event(const char *str, struct probe_point *pp)
{
char pr;
char *p;
@@ -203,18 +232,17 @@ void parse_trace_kprobe_event(const char *str, char **group, char **event,
/* Scan event and group name. */
ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]",
- &pr, (float *)(void *)group, (float *)(void *)event);
+ &pr, (float *)(void *)&pp->group,
+ (float *)(void *)&pp->event);
if (ret != 3)
semantic_error("Failed to parse event name: %s", argv[0]);
- pr_debug("Group:%s Event:%s probe:%c\n", *group, *event, pr);
-
- if (!pp)
- goto end;
+ pr_debug("Group:%s Event:%s probe:%c\n", pp->group, pp->event, pr);
pp->retprobe = (pr == 'r');
/* Scan function name and offset */
- ret = sscanf(argv[1], "%a[^+]+%d", (float *)(void *)&pp->function, &pp->offset);
+ ret = sscanf(argv[1], "%a[^+]+%d", (float *)(void *)&pp->function,
+ &pp->offset);
if (ret == 1)
pp->offset = 0;
@@ -233,15 +261,15 @@ void parse_trace_kprobe_event(const char *str, char **group, char **event,
die("Failed to copy argument.");
}
-end:
argv_free(argv);
}
-int synthesize_perf_probe_event(struct probe_point *pp)
+/* Synthesize only probe point (not argument) */
+int synthesize_perf_probe_point(struct probe_point *pp)
{
char *buf;
char offs[64] = "", line[64] = "";
- int i, len, ret;
+ int ret;
pp->probes[0] = buf = zalloc(MAX_CMDLEN);
if (!buf)
@@ -262,10 +290,24 @@ int synthesize_perf_probe_event(struct probe_point *pp)
offs, pp->retprobe ? "%return" : "", line);
else
ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", pp->file, line);
- if (ret <= 0)
- goto error;
- len = ret;
+ if (ret <= 0) {
+error:
+ free(pp->probes[0]);
+ pp->probes[0] = NULL;
+ }
+ return ret;
+}
+
+int synthesize_perf_probe_event(struct probe_point *pp)
+{
+ char *buf;
+ int i, len, ret;
+
+ len = synthesize_perf_probe_point(pp);
+ if (len < 0)
+ return 0;
+ buf = pp->probes[0];
for (i = 0; i < pp->nr_args; i++) {
ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
pp->args[i]);
@@ -278,6 +320,7 @@ int synthesize_perf_probe_event(struct probe_point *pp)
return pp->found;
error:
free(pp->probes[0]);
+ pp->probes[0] = NULL;
return ret;
}
@@ -307,6 +350,7 @@ int synthesize_trace_kprobe_event(struct probe_point *pp)
return pp->found;
error:
free(pp->probes[0]);
+ pp->probes[0] = NULL;
return ret;
}
@@ -366,6 +410,10 @@ static void clear_probe_point(struct probe_point *pp)
{
int i;
+ if (pp->event)
+ free(pp->event);
+ if (pp->group)
+ free(pp->group);
if (pp->function)
free(pp->function);
if (pp->file)
@@ -380,13 +428,15 @@ static void clear_probe_point(struct probe_point *pp)
}
/* Show an event */
-static void show_perf_probe_event(const char *group, const char *event,
- const char *place, struct probe_point *pp)
+static void show_perf_probe_event(const char *event, const char *place,
+ struct probe_point *pp)
{
- int i;
+ int i, ret;
char buf[128];
- e_snprintf(buf, 128, "%s:%s", group, event);
+ ret = e_snprintf(buf, 128, "%s:%s", pp->group, event);
+ if (ret < 0)
+ die("Failed to copy event: %s", strerror(-ret));
printf(" %-40s (on %s", buf, place);
if (pp->nr_args > 0) {
@@ -400,9 +450,7 @@ static void show_perf_probe_event(const char *group, const char *event,
/* List up current perf-probe events */
void show_perf_probe_events(void)
{
- unsigned int i;
- int fd, nr;
- char *group, *event;
+ int fd;
struct probe_point pp;
struct strlist *rawlist;
struct str_node *ent;
@@ -411,18 +459,12 @@ void show_perf_probe_events(void)
rawlist = get_trace_kprobe_event_rawlist(fd);
close(fd);
- for (i = 0; i < strlist__nr_entries(rawlist); i++) {
- ent = strlist__entry(rawlist, i);
- parse_trace_kprobe_event(ent->s, &group, &event, &pp);
+ strlist__for_each(ent, rawlist) {
+ parse_trace_kprobe_event(ent->s, &pp);
/* Synthesize only event probe point */
- nr = pp.nr_args;
- pp.nr_args = 0;
- synthesize_perf_probe_event(&pp);
- pp.nr_args = nr;
+ synthesize_perf_probe_point(&pp);
/* Show an event */
- show_perf_probe_event(group, event, pp.probes[0], &pp);
- free(group);
- free(event);
+ show_perf_probe_event(pp.event, pp.probes[0], &pp);
clear_probe_point(&pp);
}
@@ -432,26 +474,25 @@ void show_perf_probe_events(void)
/* Get current perf-probe event names */
static struct strlist *get_perf_event_names(int fd, bool include_group)
{
- unsigned int i;
- char *group, *event;
char buf[128];
struct strlist *sl, *rawlist;
struct str_node *ent;
+ struct probe_point pp;
+ memset(&pp, 0, sizeof(pp));
rawlist = get_trace_kprobe_event_rawlist(fd);
sl = strlist__new(true, NULL);
- for (i = 0; i < strlist__nr_entries(rawlist); i++) {
- ent = strlist__entry(rawlist, i);
- parse_trace_kprobe_event(ent->s, &group, &event, NULL);
+ strlist__for_each(ent, rawlist) {
+ parse_trace_kprobe_event(ent->s, &pp);
if (include_group) {
- if (e_snprintf(buf, 128, "%s:%s", group, event) < 0)
+ if (e_snprintf(buf, 128, "%s:%s", pp.group,
+ pp.event) < 0)
die("Failed to copy group:event name.");
strlist__add(sl, buf);
} else
- strlist__add(sl, event);
- free(group);
- free(event);
+ strlist__add(sl, pp.event);
+ clear_probe_point(&pp);
}
strlist__delete(rawlist);
@@ -470,7 +511,7 @@ static void write_trace_kprobe_event(int fd, const char *buf)
}
static void get_new_event_name(char *buf, size_t len, const char *base,
- struct strlist *namelist)
+ struct strlist *namelist, bool allow_suffix)
{
int i, ret;
@@ -481,6 +522,12 @@ static void get_new_event_name(char *buf, size_t len, const char *base,
if (!strlist__has_entry(namelist, buf))
return;
+ if (!allow_suffix) {
+ pr_warning("Error: event \"%s\" already exists. "
+ "(Use -f to force duplicates.)\n", base);
+ die("Can't add new event.");
+ }
+
/* Try to add suffix */
for (i = 1; i < MAX_EVENT_INDEX; i++) {
ret = e_snprintf(buf, len, "%s_%d", base, i);
@@ -493,13 +540,15 @@ 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)
+void add_trace_kprobe_events(struct probe_point *probes, int nr_probes,
+ bool force_add)
{
int i, j, fd;
struct probe_point *pp;
char buf[MAX_CMDLEN];
char event[64];
struct strlist *namelist;
+ bool allow_suffix;
fd = open_kprobe_events(O_RDWR, O_APPEND);
/* Get current event names */
@@ -507,21 +556,35 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
for (j = 0; j < nr_probes; j++) {
pp = probes + j;
+ if (!pp->event)
+ pp->event = strdup(pp->function);
+ if (!pp->group)
+ pp->group = strdup(PERFPROBE_GROUP);
+ DIE_IF(!pp->event || !pp->group);
+ /* If force_add is true, suffix search is allowed */
+ allow_suffix = force_add;
for (i = 0; i < pp->found; i++) {
/* Get an unused new event name */
- get_new_event_name(event, 64, pp->function, namelist);
+ get_new_event_name(event, 64, pp->event, namelist,
+ allow_suffix);
snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s\n",
pp->retprobe ? 'r' : 'p',
- PERFPROBE_GROUP, event,
+ pp->group, event,
pp->probes[i]);
write_trace_kprobe_event(fd, buf);
printf("Added new event:\n");
/* Get the first parameter (probe-point) */
sscanf(pp->probes[i], "%s", buf);
- show_perf_probe_event(PERFPROBE_GROUP, event,
- buf, pp);
+ show_perf_probe_event(event, buf, pp);
/* Add added event name to namelist */
strlist__add(namelist, event);
+ /*
+ * Probes after the first probe which comes from same
+ * user input are always allowed to add suffix, because
+ * there might be several addresses corresponding to
+ * one code line.
+ */
+ allow_suffix = true;
}
}
/* Show how to use the event. */
@@ -532,29 +595,55 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
close(fd);
}
+static void __del_trace_kprobe_event(int fd, struct str_node *ent)
+{
+ char *p;
+ char buf[128];
+
+ /* Convert from perf-probe event to trace-kprobe event */
+ if (e_snprintf(buf, 128, "-:%s", ent->s) < 0)
+ die("Failed to copy event.");
+ p = strchr(buf + 2, ':');
+ if (!p)
+ die("Internal error: %s should have ':' but not.", ent->s);
+ *p = '/';
+
+ write_trace_kprobe_event(fd, buf);
+ printf("Remove event: %s\n", ent->s);
+}
+
static void del_trace_kprobe_event(int fd, const char *group,
const char *event, struct strlist *namelist)
{
char buf[128];
+ struct str_node *ent, *n;
+ int found = 0;
if (e_snprintf(buf, 128, "%s:%s", group, event) < 0)
die("Failed to copy event.");
- if (!strlist__has_entry(namelist, buf)) {
- pr_warning("Warning: event \"%s\" is not found.\n", buf);
- return;
- }
- /* Convert from perf-probe event to trace-kprobe event */
- if (e_snprintf(buf, 128, "-:%s/%s", group, event) < 0)
- die("Failed to copy event.");
- write_trace_kprobe_event(fd, buf);
- printf("Remove event: %s:%s\n", group, event);
+ if (strpbrk(buf, "*?")) { /* Glob-exp */
+ strlist__for_each_safe(ent, n, namelist)
+ if (strglobmatch(ent->s, buf)) {
+ found++;
+ __del_trace_kprobe_event(fd, ent);
+ strlist__remove(namelist, ent);
+ }
+ } else {
+ ent = strlist__find(namelist, buf);
+ if (ent) {
+ found++;
+ __del_trace_kprobe_event(fd, ent);
+ strlist__remove(namelist, ent);
+ }
+ }
+ if (found == 0)
+ pr_info("Info: event \"%s\" does not exist, could not remove it.\n", buf);
}
void del_trace_kprobe_events(struct strlist *dellist)
{
int fd;
- unsigned int i;
const char *group, *event;
char *p, *str;
struct str_node *ent;
@@ -564,20 +653,21 @@ void del_trace_kprobe_events(struct strlist *dellist)
/* Get current event names */
namelist = get_perf_event_names(fd, true);
- for (i = 0; i < strlist__nr_entries(dellist); i++) {
- ent = strlist__entry(dellist, i);
+ strlist__for_each(ent, dellist) {
str = strdup(ent->s);
if (!str)
die("Failed to copy event.");
+ pr_debug("Parsing: %s\n", str);
p = strchr(str, ':');
if (p) {
group = str;
*p = '\0';
event = p + 1;
} else {
- group = PERFPROBE_GROUP;
+ group = "*";
event = str;
}
+ pr_debug("Group: %s, Event: %s\n", group, event);
del_trace_kprobe_event(fd, group, event, namelist);
free(str);
}
generated by cgit v1.1 at 2024-07-03 17:12:08 +0000