[PATCH v3] perf parse: Copy string to perf_evsel_config_term
From: Leo Yan
Date: Tue Jan 07 2020 - 07:03:35 EST
perf with CoreSight fails to record trace data with command:
perf record -e cs_etm/@tmc_etr0/u --per-thread ls
failed to set sink "" on event cs_etm/@tmc_etr0/u with 21 (Is a
directory)/perf/
This failure is root caused with the commit 1dc925568f01 ("perf
parse: Add a deep delete for parse event terms").
The log shows, cs_etm fails to parse the sink attribution; cs_etm event
relies on the event configuration to pass sink name, but the event
specific configuration data cannot be passed properly with flow:
get_config_terms()
ADD_CONFIG_TERM(DRV_CFG, drv_cfg, term->val.str);
__t->val.drv_cfg = term->val.str;
`> __t->val.drv_cfg is assigned to term->val.str;
parse_events_terms__purge()
parse_events_term__delete()
zfree(&term->val.str);
`> term->val.str is freed and assigned to NULL pointer;
cs_etm_set_sink_attr()
sink = __t->val.drv_cfg;
`> sink string has been freed.
To fix this issue, in the function get_config_terms(), this patch
changes from directly assignment pointer value for the strings to
use strdup() for allocation a new duplicate string for the cases:
perf_evsel_config_term::val.callgraph
perf_evsel_config_term::val.branch
perf_evsel_config_term::val.drv_cfg.
In the data structure perf_evsel_config_term, this patch adds
'char *str' pointer in the val union and new field 'free_str'. When the
union is used as a string pointer, 'free_str' will be set to true;
finally it's flag to tell perf_evsel__free_config_terms() to free the
string with perf_evsel_config_term::val.str.
Fixes: 1dc925568f01 ("perf parse: Add a deep delete for parse event terms")
Suggested-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Leo Yan <leo.yan@xxxxxxxxxx>
---
tools/perf/util/evsel.c | 2 ++
tools/perf/util/evsel_config.h | 2 ++
tools/perf/util/parse-events.c | 56 +++++++++++++++++++++-------------
3 files changed, 39 insertions(+), 21 deletions(-)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index a69e64236120..ab9925cc1aa7 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1265,6 +1265,8 @@ static void perf_evsel__free_config_terms(struct evsel *evsel)
list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
list_del_init(&term->list);
+ if (term->free_str)
+ free(term->val.str);
free(term);
}
}
diff --git a/tools/perf/util/evsel_config.h b/tools/perf/util/evsel_config.h
index 1f8d2fe0b66e..dfc28738e071 100644
--- a/tools/perf/util/evsel_config.h
+++ b/tools/perf/util/evsel_config.h
@@ -32,6 +32,7 @@ enum evsel_term_type {
struct perf_evsel_config_term {
struct list_head list;
enum evsel_term_type type;
+ bool free_str;
union {
u64 period;
u64 freq;
@@ -48,6 +49,7 @@ struct perf_evsel_config_term {
bool aux_output;
u32 aux_sample_size;
u64 cfg_chg;
+ char *str;
} val;
bool weak;
};
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index ed7c008b9c8b..83fb149b9485 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1220,7 +1220,6 @@ static int get_config_terms(struct list_head *head_config,
struct list_head *head_terms __maybe_unused)
{
#define ADD_CONFIG_TERM(__type, __name, __val) \
-do { \
struct perf_evsel_config_term *__t; \
\
__t = zalloc(sizeof(*__t)); \
@@ -1229,9 +1228,24 @@ do { \
\
INIT_LIST_HEAD(&__t->list); \
__t->type = PERF_EVSEL__CONFIG_TERM_ ## __type; \
- __t->val.__name = __val; \
__t->weak = term->weak; \
- list_add_tail(&__t->list, head_terms); \
+ list_add_tail(&__t->list, head_terms)
+
+#define ADD_CONFIG_TERM_VAL(__type, __name, __val) \
+do { \
+ ADD_CONFIG_TERM(__type, __name, __val); \
+ __t->val.__name = __val; \
+} while (0)
+
+#define ADD_CONFIG_TERM_STR(__type, __name, __val) \
+do { \
+ ADD_CONFIG_TERM(__type, __name, __val); \
+ __t->val.__name = strdup(__val); \
+ if (!__t->val.__name) { \
+ zfree(&__t); \
+ return -ENOMEM; \
+ } \
+ __t->free_str = true; \
} while (0)
struct parse_events_term *term;
@@ -1239,53 +1253,53 @@ do { \
list_for_each_entry(term, head_config, list) {
switch (term->type_term) {
case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
- ADD_CONFIG_TERM(PERIOD, period, term->val.num);
+ ADD_CONFIG_TERM_VAL(PERIOD, period, term->val.num);
break;
case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
- ADD_CONFIG_TERM(FREQ, freq, term->val.num);
+ ADD_CONFIG_TERM_VAL(FREQ, freq, term->val.num);
break;
case PARSE_EVENTS__TERM_TYPE_TIME:
- ADD_CONFIG_TERM(TIME, time, term->val.num);
+ ADD_CONFIG_TERM_VAL(TIME, time, term->val.num);
break;
case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
- ADD_CONFIG_TERM(CALLGRAPH, callgraph, term->val.str);
+ ADD_CONFIG_TERM_STR(CALLGRAPH, callgraph, term->val.str);
break;
case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
- ADD_CONFIG_TERM(BRANCH, branch, term->val.str);
+ ADD_CONFIG_TERM_STR(BRANCH, branch, term->val.str);
break;
case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
- ADD_CONFIG_TERM(STACK_USER, stack_user, term->val.num);
+ ADD_CONFIG_TERM_VAL(STACK_USER, stack_user, term->val.num);
break;
case PARSE_EVENTS__TERM_TYPE_INHERIT:
- ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 1 : 0);
+ ADD_CONFIG_TERM_VAL(INHERIT, inherit, term->val.num ? 1 : 0);
break;
case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
- ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 0 : 1);
+ ADD_CONFIG_TERM_VAL(INHERIT, inherit, term->val.num ? 0 : 1);
break;
case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
- ADD_CONFIG_TERM(MAX_STACK, max_stack, term->val.num);
+ ADD_CONFIG_TERM_VAL(MAX_STACK, max_stack, term->val.num);
break;
case PARSE_EVENTS__TERM_TYPE_MAX_EVENTS:
- ADD_CONFIG_TERM(MAX_EVENTS, max_events, term->val.num);
+ ADD_CONFIG_TERM_VAL(MAX_EVENTS, max_events, term->val.num);
break;
case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
- ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 1 : 0);
+ ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite, term->val.num ? 1 : 0);
break;
case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
- ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 0 : 1);
+ ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite, term->val.num ? 0 : 1);
break;
case PARSE_EVENTS__TERM_TYPE_DRV_CFG:
- ADD_CONFIG_TERM(DRV_CFG, drv_cfg, term->val.str);
+ ADD_CONFIG_TERM_STR(DRV_CFG, drv_cfg, term->val.str);
break;
case PARSE_EVENTS__TERM_TYPE_PERCORE:
- ADD_CONFIG_TERM(PERCORE, percore,
- term->val.num ? true : false);
+ ADD_CONFIG_TERM_VAL(PERCORE, percore,
+ term->val.num ? true : false);
break;
case PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT:
- ADD_CONFIG_TERM(AUX_OUTPUT, aux_output, term->val.num ? 1 : 0);
+ ADD_CONFIG_TERM_VAL(AUX_OUTPUT, aux_output, term->val.num ? 1 : 0);
break;
case PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE:
- ADD_CONFIG_TERM(AUX_SAMPLE_SIZE, aux_sample_size, term->val.num);
+ ADD_CONFIG_TERM_VAL(AUX_SAMPLE_SIZE, aux_sample_size, term->val.num);
break;
default:
break;
@@ -1322,7 +1336,7 @@ static int get_config_chgs(struct perf_pmu *pmu, struct list_head *head_config,
}
if (bits)
- ADD_CONFIG_TERM(CFG_CHG, cfg_chg, bits);
+ ADD_CONFIG_TERM_VAL(CFG_CHG, cfg_chg, bits);
#undef ADD_CONFIG_TERM
return 0;
--
2.17.1