[PATCH v1 09/41] perf header: Pass e_machine to strcmp_cpuid_str()
From: Ian Rogers
Date: Tue Nov 03 2026 - 18:49:06 EST
The format of a CPUID depends on its architecture, but
strcmp_cpuid_str() is only given the two CPUID strings and its
architecture specific implementations assume the CPUIDs are for the
architecture perf was built for.
Pass the ELF machine of the CPUIDs' architecture to strcmp_cpuid_str()
so that CPUIDs can be compared according to their architecture rather
than the host's. The pmu-events tables pass their e_machine, comparisons
with the host's CPUID pass EM_HOST and the arm64 CPUID matching test
passes EM_AARCH64. The architecture specific implementations don't yet
use the argument.
Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
tools/perf/arch/arm64/tests/cpuid-match.c | 17 +++++++++--------
tools/perf/arch/arm64/util/header.c | 2 +-
tools/perf/arch/x86/util/header.c | 2 +-
tools/perf/arch/x86/util/pmu.c | 10 ++++++----
tools/perf/pmu-events/empty-pmu-events.c | 6 +++---
tools/perf/pmu-events/jevents.py | 6 +++---
tools/perf/util/expr.c | 3 ++-
tools/perf/util/header.c | 3 ++-
tools/perf/util/header.h | 6 +++++-
9 files changed, 32 insertions(+), 23 deletions(-)
diff --git a/tools/perf/arch/arm64/tests/cpuid-match.c b/tools/perf/arch/arm64/tests/cpuid-match.c
index e8e3947cca18..b073ac33ea9b 100644
--- a/tools/perf/arch/arm64/tests/cpuid-match.c
+++ b/tools/perf/arch/arm64/tests/cpuid-match.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/compiler.h>
+#include <elf.h>
#include "arch-tests.h"
#include "tests/tests.h"
@@ -9,28 +10,28 @@ int test__cpuid_match(struct test_suite *test __maybe_unused,
int subtest __maybe_unused)
{
/* midr with no leading zeros matches */
- if (strcmp_cpuid_str("0x410fd0c0", "0x00000000410fd0c0"))
+ if (strcmp_cpuid_str(EM_AARCH64, "0x410fd0c0", "0x00000000410fd0c0"))
return -1;
/* Upper case matches */
- if (strcmp_cpuid_str("0x410fd0c0", "0x00000000410FD0C0"))
+ if (strcmp_cpuid_str(EM_AARCH64, "0x410fd0c0", "0x00000000410FD0C0"))
return -1;
/* r0p0 = r0p0 matches */
- if (strcmp_cpuid_str("0x00000000410fd480", "0x00000000410fd480"))
+ if (strcmp_cpuid_str(EM_AARCH64, "0x00000000410fd480", "0x00000000410fd480"))
return -1;
/* r0p1 > r0p0 matches */
- if (strcmp_cpuid_str("0x00000000410fd480", "0x00000000410fd481"))
+ if (strcmp_cpuid_str(EM_AARCH64, "0x00000000410fd480", "0x00000000410fd481"))
return -1;
/* r1p0 > r0p0 matches*/
- if (strcmp_cpuid_str("0x00000000410fd480", "0x00000000411fd480"))
+ if (strcmp_cpuid_str(EM_AARCH64, "0x00000000410fd480", "0x00000000411fd480"))
return -1;
/* r0p0 < r0p1 doesn't match */
- if (!strcmp_cpuid_str("0x00000000410fd481", "0x00000000410fd480"))
+ if (!strcmp_cpuid_str(EM_AARCH64, "0x00000000410fd481", "0x00000000410fd480"))
return -1;
/* r0p0 < r1p0 doesn't match */
- if (!strcmp_cpuid_str("0x00000000411fd480", "0x00000000410fd480"))
+ if (!strcmp_cpuid_str(EM_AARCH64, "0x00000000411fd480", "0x00000000410fd480"))
return -1;
/* Different CPU doesn't match */
- if (!strcmp_cpuid_str("0x00000000410fd4c0", "0x00000000430f0af0"))
+ if (!strcmp_cpuid_str(EM_AARCH64, "0x00000000410fd4c0", "0x00000000430f0af0"))
return -1;
return 0;
diff --git a/tools/perf/arch/arm64/util/header.c b/tools/perf/arch/arm64/util/header.c
index 95e71c4f6c78..ee28add836b5 100644
--- a/tools/perf/arch/arm64/util/header.c
+++ b/tools/perf/arch/arm64/util/header.c
@@ -87,7 +87,7 @@ char *get_cpuid_str(struct perf_cpu cpu)
*
* Return 1 if the CPU type is different or the version of idstr is lower.
*/
-int strcmp_cpuid_str(const char *mapcpuid, const char *idstr)
+int strcmp_cpuid_str(uint16_t e_machine __maybe_unused, const char *mapcpuid, const char *idstr)
{
u64 map_id = strtoull(mapcpuid, NULL, 16);
char map_id_variant = FIELD_GET(MIDR_VARIANT_MASK, map_id);
diff --git a/tools/perf/arch/x86/util/header.c b/tools/perf/arch/x86/util/header.c
index 412977f8aa83..b65856f3b846 100644
--- a/tools/perf/arch/x86/util/header.c
+++ b/tools/perf/arch/x86/util/header.c
@@ -91,7 +91,7 @@ static bool is_full_cpuid(const char *id)
return false;
}
-int strcmp_cpuid_str(const char *mapcpuid, const char *id)
+int strcmp_cpuid_str(uint16_t e_machine __maybe_unused, const char *mapcpuid, const char *id)
{
regex_t re;
regmatch_t pmatch[1];
diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c
index fd4491fda117..37269154e5e7 100644
--- a/tools/perf/arch/x86/util/pmu.c
+++ b/tools/perf/arch/x86/util/pmu.c
@@ -22,6 +22,7 @@
#include "util/debug.h"
#include "util/env.h"
#include "util/header.h"
+#include "dwarf-regs.h"
#define GENUINE_INTEL_SPR "GenuineIntel-6-8F"
#define GENUINE_INTEL_EMR "GenuineIntel-6-CF"
@@ -41,7 +42,8 @@ static void init_snc_support(void)
char *cpuid = get_cpuid_str((struct perf_cpu){0});
for (size_t i = 0; i < ARRAY_SIZE(supported_cpuids); i++) {
- cached_snc_supported = cpuid && strcmp_cpuid_str(supported_cpuids[i], cpuid) == 0;
+ cached_snc_supported = cpuid &&
+ strcmp_cpuid_str(EM_HOST, supported_cpuids[i], cpuid) == 0;
if (cached_snc_supported)
break;
}
@@ -173,11 +175,11 @@ static void init_snc_map(void)
case 2:
cpuid = get_cpuid_str((struct perf_cpu){ 0 });
if (cpuid) {
- if (strcmp_cpuid_str(GENUINE_INTEL_SPR, cpuid) == 0 ||
- strcmp_cpuid_str(GENUINE_INTEL_EMR, cpuid) == 0) {
+ if (strcmp_cpuid_str(EM_HOST, GENUINE_INTEL_SPR, cpuid) == 0 ||
+ strcmp_cpuid_str(EM_HOST, GENUINE_INTEL_EMR, cpuid) == 0) {
cached_imc_snc_map = spr_emr_snc2_map;
cached_imc_snc_map_len = ARRAY_SIZE(spr_emr_snc2_map);
- } else if (strcmp_cpuid_str(GENUINE_INTEL_GNR, cpuid) == 0) {
+ } else if (strcmp_cpuid_str(EM_HOST, GENUINE_INTEL_GNR, cpuid) == 0) {
cached_imc_snc_map = gnr_snc2_map;
cached_imc_snc_map_len = ARRAY_SIZE(gnr_snc2_map);
}
diff --git a/tools/perf/pmu-events/empty-pmu-events.c b/tools/perf/pmu-events/empty-pmu-events.c
index eba5446520c4..872c6ca6e817 100644
--- a/tools/perf/pmu-events/empty-pmu-events.c
+++ b/tools/perf/pmu-events/empty-pmu-events.c
@@ -5831,7 +5831,7 @@ static const struct pmu_events_map *map_for_cpu(struct perf_cpu cpu)
}
if (pmu_events_map__e_machine_matches(map, EM_HOST) &&
- !strcmp_cpuid_str(map->cpuid, cpuid))
+ !strcmp_cpuid_str(map->e_machine, map->cpuid, cpuid))
break;
}
free(last_map_search.cpuid);
@@ -5933,7 +5933,7 @@ const struct pmu_events_table *find_core_events_table(uint16_t e_machine, const
tables->arch;
tables++) {
if (pmu_events_map__e_machine_matches(tables, e_machine) &&
- !strcmp_cpuid_str(tables->cpuid, cpuid))
+ !strcmp_cpuid_str(tables->e_machine, tables->cpuid, cpuid))
return &tables->event_table;
}
return NULL;
@@ -5945,7 +5945,7 @@ const struct pmu_metrics_table *find_core_metrics_table(uint16_t e_machine, cons
tables->arch;
tables++) {
if (pmu_events_map__e_machine_matches(tables, e_machine) &&
- !strcmp_cpuid_str(tables->cpuid, cpuid))
+ !strcmp_cpuid_str(tables->e_machine, tables->cpuid, cpuid))
return &tables->metric_table;
}
return NULL;
diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
index fc3de5fbda27..802ae2ad4405 100755
--- a/tools/perf/pmu-events/jevents.py
+++ b/tools/perf/pmu-events/jevents.py
@@ -1249,7 +1249,7 @@ static const struct pmu_events_map *map_for_cpu(struct perf_cpu cpu)
\t\t\t}
\t\t\tif (pmu_events_map__e_machine_matches(map, EM_HOST) &&
-\t\t\t !strcmp_cpuid_str(map->cpuid, cpuid))
+\t\t\t !strcmp_cpuid_str(map->e_machine, map->cpuid, cpuid))
\t\t\t\tbreak;
\t\t}
\t\tfree(last_map_search.cpuid);
@@ -1351,7 +1351,7 @@ const struct pmu_events_table *find_core_events_table(uint16_t e_machine, const
\t tables->arch;
\t tables++) {
\t\tif (pmu_events_map__e_machine_matches(tables, e_machine) &&
-\t\t !strcmp_cpuid_str(tables->cpuid, cpuid))
+\t\t !strcmp_cpuid_str(tables->e_machine, tables->cpuid, cpuid))
\t\t\treturn &tables->event_table;
\t}
\treturn NULL;
@@ -1363,7 +1363,7 @@ const struct pmu_metrics_table *find_core_metrics_table(uint16_t e_machine, cons
\t tables->arch;
\t tables++) {
\t\tif (pmu_events_map__e_machine_matches(tables, e_machine) &&
-\t\t !strcmp_cpuid_str(tables->cpuid, cpuid))
+\t\t !strcmp_cpuid_str(tables->e_machine, tables->cpuid, cpuid))
\t\t\treturn &tables->metric_table;
\t}
\treturn NULL;
diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
index f1164c4666b1..09ced31ef59e 100644
--- a/tools/perf/util/expr.c
+++ b/tools/perf/util/expr.c
@@ -14,6 +14,7 @@
#include <util/expr-flex.h>
#include "util/hashmap.h"
#include "util/header.h"
+#include "dwarf-regs.h"
#include "util/pmu.h"
#include <perf/cpumap.h>
#include <linux/err.h>
@@ -485,7 +486,7 @@ double expr__strcmp_cpuid_str(const struct expr_parse_ctx *ctx __maybe_unused,
if (!cpuid)
return NAN;
- ret = !strcmp_cpuid_str(test_id, cpuid);
+ ret = !strcmp_cpuid_str(EM_HOST, test_id, cpuid);
free(cpuid);
return ret;
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 2c686095fe67..38525b17f26d 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -964,7 +964,8 @@ char *get_cpuid_allow_env_override(struct perf_cpu cpu)
* cpuid string generated on this platform.
* Otherwise return non-zero.
*/
-int __weak strcmp_cpuid_str(const char *mapcpuid, const char *cpuid)
+int __weak strcmp_cpuid_str(uint16_t e_machine __maybe_unused, const char *mapcpuid,
+ const char *cpuid)
{
regex_t re;
regmatch_t pmatch[1];
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 765037762758..d30fb30a0c92 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -219,7 +219,11 @@ char *get_cpuid_str(struct perf_cpu cpu);
char *get_cpuid_allow_env_override(struct perf_cpu cpu);
-int strcmp_cpuid_str(const char *s1, const char *s2);
+/*
+ * Compare a CPUID from a pmu-events mapfile.csv, @mapcpuid, with @cpuid for
+ * the architecture with ELF machine @e_machine. Returns 0 on a match.
+ */
+int strcmp_cpuid_str(uint16_t e_machine, const char *mapcpuid, const char *cpuid);
struct cpu_domain_map **build_cpu_domain_map(u32 *schedstat_version, u32 *max_sched_domains,
u32 nr);
--
2.56.0.385.gac671c819a-goog