[PATCH v17 3/4] pmu: support reading Intel x86_64 PMU events in runtime

[Tomasz Duszynski]

Add support for reading Intel x86_64 PMU events in runtime.

Signed-off-by: Tomasz Duszynski <tduszynski at marvell.com>
---
 app/test/test_pmu.c          |  2 ++
 lib/pmu/meson.build          |  1 +
 lib/pmu/rte_pmu.h            |  2 ++
 lib/pmu/rte_pmu_pmc_x86_64.h | 24 ++++++++++++++++++++++++
 4 files changed, 29 insertions(+)
 create mode 100644 lib/pmu/rte_pmu_pmc_x86_64.h

diff --git a/app/test/test_pmu.c b/app/test/test_pmu.c
index e0c11e4898..addb078005 100644
--- a/app/test/test_pmu.c
+++ b/app/test/test_pmu.c
@@ -15,6 +15,8 @@ test_pmu_read(void)
 
 #if defined(RTE_ARCH_ARM64)
 	name = "cpu_cycles";
+#elif defined(RTE_ARCH_X86_64)
+	name = "cpu-cycles";
 #endif
 
 	if (name == NULL) {
diff --git a/lib/pmu/meson.build b/lib/pmu/meson.build
index 467841e431..ad16ead11f 100644
--- a/lib/pmu/meson.build
+++ b/lib/pmu/meson.build
@@ -12,6 +12,7 @@ sources = files('rte_pmu.c')
 
 indirect_headers += files(
         'rte_pmu_pmc_arm64.h',
+        'rte_pmu_pmc_x86_64.h',
 )
 
 if dpdk_conf.has('RTE_ARCH_ARM64')
diff --git a/lib/pmu/rte_pmu.h b/lib/pmu/rte_pmu.h
index 171c52e692..c66898d1d3 100644
--- a/lib/pmu/rte_pmu.h
+++ b/lib/pmu/rte_pmu.h
@@ -39,6 +39,8 @@ extern "C" {
 
 #if defined(RTE_ARCH_ARM64)
 #include "rte_pmu_pmc_arm64.h"
+#elif defined(RTE_ARCH_X86_64)
+#include "rte_pmu_pmc_x86_64.h"
 #endif
 
 /** Maximum number of events in a group */
diff --git a/lib/pmu/rte_pmu_pmc_x86_64.h b/lib/pmu/rte_pmu_pmc_x86_64.h
new file mode 100644
index 0000000000..9ba6e5bae8
--- /dev/null
+++ b/lib/pmu/rte_pmu_pmc_x86_64.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2025 Marvell.
+ */
+#ifndef _RTE_PMU_PMC_X86_64_H_
+#define _RTE_PMU_PMC_X86_64_H_
+
+#include <rte_common.h>
+
+static __rte_always_inline uint64_t
+rte_pmu_pmc_read(int index)
+{
+	uint64_t low, high;
+
+	asm volatile(
+		"rdpmc\n"
+		: "=a" (low), "=d" (high)
+		: "c" (index)
+	);
+
+	return low | (high << 32);
+}
+#define rte_pmu_pmc_read rte_pmu_pmc_read
+
+#endif /* _RTE_PMU_PMC_X86_64_H_ */
-- 
2.34.1