perf pmu: Warn about invalid config for all PMUs and configs

Don't just check the raw PMU type, the only core PMU on homogeneous x86,
check raw and all dynamically added PMUs. Extend the
perf_pmu__warn_invalid_config to check all 4 config values.

Rather than process the format list once per event, store the computed
masks for each config value.

Don't ignore the mask being zero, which is likely for config2 and
config3, add config_masks_present so config values can be ignored only
when no format information is present.
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20230601023644.587584-2-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/parse-events.c

@@ -245,9 +245,16 @@ __add_event(struct list_head *list, int *idx,
 	if (pmu)
 		perf_pmu__warn_invalid_formats(pmu);
 
-	if (pmu && attr->type == PERF_TYPE_RAW)
-		perf_pmu__warn_invalid_config(pmu, attr->config, name);
-
+	if (pmu && (attr->type == PERF_TYPE_RAW || attr->type >= PERF_TYPE_MAX)) {
+		perf_pmu__warn_invalid_config(pmu, attr->config, name,
+					      PERF_PMU_FORMAT_VALUE_CONFIG, "config");
+		perf_pmu__warn_invalid_config(pmu, attr->config1, name,
+					      PERF_PMU_FORMAT_VALUE_CONFIG1, "config1");
+		perf_pmu__warn_invalid_config(pmu, attr->config2, name,
+					      PERF_PMU_FORMAT_VALUE_CONFIG2, "config2");
+		perf_pmu__warn_invalid_config(pmu, attr->config3, name,
+					      PERF_PMU_FORMAT_VALUE_CONFIG3, "config3");
+	}
 	if (init_attr)
 		event_attr_init(attr);
 

tools/perf/util/pmu.c

@@ -1627,37 +1627,53 @@ int perf_pmu__caps_parse(struct perf_pmu *pmu)
 	return pmu->nr_caps;
 }
 
-void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
-				   const char *name)
+static void perf_pmu__compute_config_masks(struct perf_pmu *pmu)
 {
 	struct perf_pmu_format *format;
-	__u64 masks = 0, bits;
-	char buf[100];
-	unsigned int i;
+
+	if (pmu->config_masks_computed)
+		return;
 
 	list_for_each_entry(format, &pmu->format, list)	{
-		if (format->value != PERF_PMU_FORMAT_VALUE_CONFIG)
+		unsigned int i;
+		__u64 *mask;
+
+		if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END)
 			continue;
 
+		pmu->config_masks_present = true;
+		mask = &pmu->config_masks[format->value];
+
 		for_each_set_bit(i, format->bits, PERF_PMU_FORMAT_BITS)
-			masks |= 1ULL << i;
+			*mask |= 1ULL << i;
 	}
+	pmu->config_masks_computed = true;
+}
+
+void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
+				   const char *name, int config_num,
+				   const char *config_name)
+{
+	__u64 bits;
+	char buf[100];
+
+	perf_pmu__compute_config_masks(pmu);
 
 	/*
 	 * Kernel doesn't export any valid format bits.
 	 */
-	if (masks == 0)
+	if (!pmu->config_masks_present)
 		return;
 
-	bits = config & ~masks;
+	bits = config & ~pmu->config_masks[config_num];
 	if (bits == 0)
 		return;
 
 	bitmap_scnprintf((unsigned long *)&bits, sizeof(bits) * 8, buf, sizeof(buf));
 
-	pr_warning("WARNING: event '%s' not valid (bits %s of config "
+	pr_warning("WARNING: event '%s' not valid (bits %s of %s "
 		   "'%llx' not supported by kernel)!\n",
-		   name ?: "N/A", buf, config);
+		   name ?: "N/A", buf, config_name, config);
 }
 
 int perf_pmu__match(char *pattern, char *name, char *tok)

tools/perf/util/pmu.h

@@ -81,6 +81,10 @@ struct perf_pmu {
 	 * perf_event_attr once.
 	 */
 	bool formats_checked;
+	/** @config_masks_present: Are there config format values? */
+	bool config_masks_present;
+	/** @config_masks_computed: Set when masks are lazily computed. */
+	bool config_masks_computed;
 	/**
 	 * @max_precise: Number of levels of :ppp precision supported by the
 	 * PMU, read from
@@ -125,6 +129,12 @@ struct perf_pmu {
 	/** @list: Element on pmus list in pmu.c. */
 	struct list_head list;
 
+	/**
+	 * @config_masks: Derived from the PMU's format data, bits that are
+	 * valid within the config value.
+	 */
+	__u64 config_masks[PERF_PMU_FORMAT_VALUE_CONFIG_END];
+
 	/**
 	 * @missing_features: Features to inhibit when events on this PMU are
 	 * opened.
@@ -260,7 +270,8 @@ int perf_pmu__convert_scale(const char *scale, char **end, double *sval);
 int perf_pmu__caps_parse(struct perf_pmu *pmu);
 
 void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
-				   const char *name);
+				   const char *name, int config_num,
+				   const char *config_name);
 void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu);
 
 int perf_pmu__match(char *pattern, char *name, char *tok);