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Message-Id: <20251208-james-perf-config-bits-v2-1-4ac0281993b0@linaro.org>
Date: Mon, 08 Dec 2025 14:22:04 +0000
From: James Clark <james.clark@...aro.org>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Mike Leach <mike.leach@...aro.org>, John Garry <john.g.garry@...cle.com>,
Will Deacon <will@...nel.org>, Leo Yan <leo.yan@...ux.dev>, leo.yan@....com
Cc: linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
James Clark <james.clark@...aro.org>
Subject: [PATCH v2 01/12] perf parse-events: Refactor get_config_terms() to
remove macros
The ADD_CONFIG_TERM() macros build the __type argument out of a partial
EVSEL__CONFIG_TERM_x enum name. This means that they can't be called
from a function where __type is a variable and it's also impossible to
grep the codebase to find usages of these enums as they're never typed
in full.
Fix this by removing the macros and replacing them with an
add_config_term() function. It seems the main reason these existed in
the first place was to avoid type punning and to write to a specific
field in the union, but the same thing can be achieved with a single
write to a u64 'val' field.
Signed-off-by: James Clark <james.clark@...aro.org>
---
tools/perf/util/evsel_config.h | 1 +
tools/perf/util/parse-events.c | 146 ++++++++++++++++++++++++-----------------
2 files changed, 86 insertions(+), 61 deletions(-)
diff --git a/tools/perf/util/evsel_config.h b/tools/perf/util/evsel_config.h
index bcd3a978f0c4..685fd8d5c4a8 100644
--- a/tools/perf/util/evsel_config.h
+++ b/tools/perf/util/evsel_config.h
@@ -50,6 +50,7 @@ struct evsel_config_term {
u64 cfg_chg;
char *str;
int cpu;
+ u64 val;
} val;
bool weak;
};
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 17c1c36a7bf9..d5b009b4ebab 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1116,105 +1116,107 @@ static int config_attr(struct perf_event_attr *attr,
return 0;
}
-static int get_config_terms(const struct parse_events_terms *head_config,
- struct list_head *head_terms)
+static struct evsel_config_term *add_config_term(enum evsel_term_type type,
+ struct list_head *head_terms,
+ bool weak)
{
-#define ADD_CONFIG_TERM(__type, __weak) \
- struct evsel_config_term *__t; \
- \
- __t = zalloc(sizeof(*__t)); \
- if (!__t) \
- return -ENOMEM; \
- \
- INIT_LIST_HEAD(&__t->list); \
- __t->type = EVSEL__CONFIG_TERM_ ## __type; \
- __t->weak = __weak; \
- list_add_tail(&__t->list, head_terms)
-
-#define ADD_CONFIG_TERM_VAL(__type, __name, __val, __weak) \
-do { \
- ADD_CONFIG_TERM(__type, __weak); \
- __t->val.__name = __val; \
-} while (0)
+ struct evsel_config_term *t;
-#define ADD_CONFIG_TERM_STR(__type, __val, __weak) \
-do { \
- ADD_CONFIG_TERM(__type, __weak); \
- __t->val.str = strdup(__val); \
- if (!__t->val.str) { \
- zfree(&__t); \
- return -ENOMEM; \
- } \
- __t->free_str = true; \
-} while (0)
+ t = zalloc(sizeof(*t));
+ if (!t)
+ return NULL;
+
+ INIT_LIST_HEAD(&t->list);
+ t->type = type;
+ t->weak = weak;
+ list_add_tail(&t->list, head_terms);
+ return t;
+}
+
+static int get_config_terms(const struct parse_events_terms *head_config,
+ struct list_head *head_terms)
+{
struct parse_events_term *term;
list_for_each_entry(term, &head_config->terms, list) {
+ struct evsel_config_term *new_term;
+ enum evsel_term_type new_type;
+ char *str = NULL;
+ u64 val;
+
switch (term->type_term) {
case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
- ADD_CONFIG_TERM_VAL(PERIOD, period, term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_PERIOD;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
- ADD_CONFIG_TERM_VAL(FREQ, freq, term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_FREQ;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_TIME:
- ADD_CONFIG_TERM_VAL(TIME, time, term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_TIME;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
- ADD_CONFIG_TERM_STR(CALLGRAPH, term->val.str, term->weak);
+ new_type = EVSEL__CONFIG_TERM_CALLGRAPH;
+ str = term->val.str;
break;
case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
- ADD_CONFIG_TERM_STR(BRANCH, term->val.str, term->weak);
+ new_type = EVSEL__CONFIG_TERM_BRANCH;
+ str = term->val.str;
break;
case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
- ADD_CONFIG_TERM_VAL(STACK_USER, stack_user,
- term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_STACK_USER;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_INHERIT:
- ADD_CONFIG_TERM_VAL(INHERIT, inherit,
- term->val.num ? 1 : 0, term->weak);
+ new_type = EVSEL__CONFIG_TERM_INHERIT;
+ val = term->val.num ? 1 : 0;
break;
case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
- ADD_CONFIG_TERM_VAL(INHERIT, inherit,
- term->val.num ? 0 : 1, term->weak);
+ new_type = EVSEL__CONFIG_TERM_INHERIT;
+ val = term->val.num ? 0 : 1;
break;
case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
- ADD_CONFIG_TERM_VAL(MAX_STACK, max_stack,
- term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_MAX_STACK;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_MAX_EVENTS:
- ADD_CONFIG_TERM_VAL(MAX_EVENTS, max_events,
- term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_MAX_EVENTS;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
- ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite,
- term->val.num ? 1 : 0, term->weak);
+ new_type = EVSEL__CONFIG_TERM_OVERWRITE;
+ val = term->val.num ? 1 : 0;
break;
case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
- ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite,
- term->val.num ? 0 : 1, term->weak);
+ new_type = EVSEL__CONFIG_TERM_OVERWRITE;
+ val = term->val.num ? 0 : 1;
break;
case PARSE_EVENTS__TERM_TYPE_DRV_CFG:
- ADD_CONFIG_TERM_STR(DRV_CFG, term->val.str, term->weak);
+ new_type = EVSEL__CONFIG_TERM_DRV_CFG;
+ str = term->val.str;
break;
case PARSE_EVENTS__TERM_TYPE_PERCORE:
- ADD_CONFIG_TERM_VAL(PERCORE, percore,
- term->val.num ? true : false, term->weak);
+ new_type = EVSEL__CONFIG_TERM_PERCORE;
+ val = term->val.num ? true : false;
break;
case PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT:
- ADD_CONFIG_TERM_VAL(AUX_OUTPUT, aux_output,
- term->val.num ? 1 : 0, term->weak);
+ new_type = EVSEL__CONFIG_TERM_AUX_OUTPUT;
+ val = term->val.num ? 1 : 0;
break;
case PARSE_EVENTS__TERM_TYPE_AUX_ACTION:
- ADD_CONFIG_TERM_STR(AUX_ACTION, term->val.str, term->weak);
+ new_type = EVSEL__CONFIG_TERM_AUX_ACTION;
+ str = term->val.str;
break;
case PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE:
- ADD_CONFIG_TERM_VAL(AUX_SAMPLE_SIZE, aux_sample_size,
- term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_RATIO_TO_PREV:
- ADD_CONFIG_TERM_STR(RATIO_TO_PREV, term->val.str, term->weak);
+ new_type = EVSEL__CONFIG_TERM_RATIO_TO_PREV;
+ str = term->val.str;
break;
case PARSE_EVENTS__TERM_TYPE_USER:
case PARSE_EVENTS__TERM_TYPE_CONFIG:
@@ -1229,7 +1231,23 @@ do { \
case PARSE_EVENTS__TERM_TYPE_RAW:
case PARSE_EVENTS__TERM_TYPE_CPU:
default:
- break;
+ /* Don't add a new term for these ones */
+ continue;
+ }
+
+ new_term = add_config_term(new_type, head_terms, term->weak);
+ if (!new_term)
+ return -ENOMEM;
+
+ if (str) {
+ new_term->val.str = strdup(str);
+ if (!new_term->val.str) {
+ zfree(&new_term);
+ return -ENOMEM;
+ }
+ new_term->free_str = true;
+ } else {
+ new_term->val.val = val;
}
}
return 0;
@@ -1290,10 +1308,16 @@ static int get_config_chgs(struct perf_pmu *pmu, struct parse_events_terms *head
}
}
- if (bits)
- ADD_CONFIG_TERM_VAL(CFG_CHG, cfg_chg, bits, false);
+ if (bits) {
+ struct evsel_config_term *new_term;
+
+ new_term = add_config_term(EVSEL__CONFIG_TERM_CFG_CHG,
+ head_terms, false);
+ if (!new_term)
+ return -ENOMEM;
+ new_term->val.cfg_chg = bits;
+ }
-#undef ADD_CONFIG_TERM
return 0;
}
--
2.34.1
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