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Mon, 08 Dec 2025 06:23:23 -0800 (PST) From: James Clark Date: Mon, 08 Dec 2025 14:22:08 +0000 Subject: [PATCH v2 05/12] perf evsel: Add a helper to get the value of a config field Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251208-james-perf-config-bits-v2-5-4ac0281993b0@linaro.org> References: <20251208-james-perf-config-bits-v2-0-4ac0281993b0@linaro.org> In-Reply-To: <20251208-james-perf-config-bits-v2-0-4ac0281993b0@linaro.org> To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Suzuki K Poulose , Mike Leach , John Garry , Will Deacon , Leo Yan , leo.yan@arm.com Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, James Clark X-Mailer: b4 0.14.0 This will be used by aux PMUs to read an already written value for configuring their events and for also testing. Its helper pmu_format_unpack() does the opposite of the existing pmu_format_value() so rename that one to pmu_format_pack() so it's clear how they are related. Signed-off-by: James Clark --- tools/perf/util/evsel.h | 2 ++ tools/perf/util/pmu.c | 77 ++++++++++++++++++++++++++++++++++++++++++------- 2 files changed, 68 insertions(+), 11 deletions(-) diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index a08130ff2e47..092904a61ec7 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -575,6 +575,8 @@ void evsel__uniquify_counter(struct evsel *counter); ((((src) >> (pos)) & ((1ull << (size)) - 1)) << (63 - ((pos) + (size) - 1))) u64 evsel__bitfield_swap_branch_flags(u64 value); +int evsel__get_config_val(struct perf_pmu *pmu, struct evsel *evsel, + const char *config_name, u64 *val); void evsel__set_config_if_unset(struct perf_pmu *pmu, struct evsel *evsel, const char *config_name, u64 val); diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 514cba91f5d9..ef7358ad1fb9 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -144,8 +144,8 @@ struct perf_pmu_format { }; static int pmu_aliases_parse(struct perf_pmu *pmu); -static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v, - bool zero); +static void pmu_format_pack(unsigned long *format, __u64 value, __u64 *v, + bool zero); static struct perf_pmu_format *pmu_find_format(const struct list_head *formats, const char *name); @@ -1377,6 +1377,61 @@ bool evsel__is_aux_event(const struct evsel *evsel) return pmu && pmu->auxtrace; } +/* + * Unpacks a raw config[n] value using the sparse bitfield that defines a + * format attr. For example "config1:1,6-7,44" defines a 4 bit value across non + * contiguous bits and this function returns those 4 bits as a value. + */ +static u64 pmu_format_unpack(u64 format, u64 config_val) +{ + int val_bit = 0; + u64 res = 0; + int fmt_bit; + + for_each_set_bit(fmt_bit, &format, PERF_PMU_FORMAT_BITS) { + if (test_bit(fmt_bit, &config_val)) + res |= BIT_ULL(val_bit); + + val_bit++; + } + return res; +} + +int evsel__get_config_val(struct perf_pmu *pmu, struct evsel *evsel, + const char *config_name, u64 *val) +{ + struct perf_pmu_format *format = pmu_find_format(&pmu->format, config_name); + u64 bits = perf_pmu__format_bits(pmu, config_name); + + if (!format || !bits) { + pr_err("Unknown/empty format name: %s\n", config_name); + *val = 0; + return -EINVAL; + } + + switch (format->value) { + case PERF_PMU_FORMAT_VALUE_CONFIG: + *val = pmu_format_unpack(bits, evsel->core.attr.config); + return 0; + case PERF_PMU_FORMAT_VALUE_CONFIG1: + *val = pmu_format_unpack(bits, evsel->core.attr.config1); + return 0; + case PERF_PMU_FORMAT_VALUE_CONFIG2: + *val = pmu_format_unpack(bits, evsel->core.attr.config2); + return 0; + case PERF_PMU_FORMAT_VALUE_CONFIG3: + *val = pmu_format_unpack(bits, evsel->core.attr.config3); + return 0; + case PERF_PMU_FORMAT_VALUE_CONFIG4: + *val = pmu_format_unpack(bits, evsel->core.attr.config4); + return 0; + default: + pr_err("Unknown format value: %d\n", format->value); + *val = 0; + return -EINVAL; + } +} + /* * Set @config_name to @val as long as the user hasn't already set or cleared it * by passing a config term on the command line. @@ -1432,7 +1487,7 @@ void evsel__set_config_if_unset(struct perf_pmu *pmu, struct evsel *evsel, return; /* Otherwise replace it */ - pmu_format_value(&bits, val, vp, /*zero=*/true); + pmu_format_pack(&bits, val, vp, /*zero=*/true); } static struct perf_pmu_format * @@ -1477,8 +1532,8 @@ int perf_pmu__format_type(struct perf_pmu *pmu, const char *name) * Sets value based on the format definition (format parameter) * and unformatted value (value parameter). */ -static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v, - bool zero) +static void pmu_format_pack(unsigned long *format, __u64 value, __u64 *v, + bool zero) { unsigned long fbit, vbit; @@ -1595,23 +1650,23 @@ static int pmu_config_term(const struct perf_pmu *pmu, switch (term->type_term) { case PARSE_EVENTS__TERM_TYPE_CONFIG: assert(term->type_val == PARSE_EVENTS__TERM_TYPE_NUM); - pmu_format_value(bits, term->val.num, &attr->config, zero); + pmu_format_pack(bits, term->val.num, &attr->config, zero); break; case PARSE_EVENTS__TERM_TYPE_CONFIG1: assert(term->type_val == PARSE_EVENTS__TERM_TYPE_NUM); - pmu_format_value(bits, term->val.num, &attr->config1, zero); + pmu_format_pack(bits, term->val.num, &attr->config1, zero); break; case PARSE_EVENTS__TERM_TYPE_CONFIG2: assert(term->type_val == PARSE_EVENTS__TERM_TYPE_NUM); - pmu_format_value(bits, term->val.num, &attr->config2, zero); + pmu_format_pack(bits, term->val.num, &attr->config2, zero); break; case PARSE_EVENTS__TERM_TYPE_CONFIG3: assert(term->type_val == PARSE_EVENTS__TERM_TYPE_NUM); - pmu_format_value(bits, term->val.num, &attr->config3, zero); + pmu_format_pack(bits, term->val.num, &attr->config3, zero); break; case PARSE_EVENTS__TERM_TYPE_CONFIG4: assert(term->type_val == PARSE_EVENTS__TERM_TYPE_NUM); - pmu_format_value(bits, term->val.num, &attr->config4, zero); + pmu_format_pack(bits, term->val.num, &attr->config4, zero); break; case PARSE_EVENTS__TERM_TYPE_LEGACY_HARDWARE_CONFIG: assert(term->type_val == PARSE_EVENTS__TERM_TYPE_NUM); @@ -1749,7 +1804,7 @@ static int pmu_config_term(const struct perf_pmu *pmu, */ } - pmu_format_value(format->bits, val, vp, zero); + pmu_format_pack(format->bits, val, vp, zero); return 0; } -- 2.34.1