[PATCH v5 3/4] eal/x86: support reading Intel PMU events in runtime

[Tomasz Duszynski]

Add support for reading Intel PMU events in runtime.

Signed-off-by: Tomasz Duszynski <tduszyn...@marvell.com>
---
 app/test/test_pmu.c               |  2 ++
 lib/eal/include/rte_pmu.h         |  2 +-
 lib/eal/x86/include/meson.build   |  1 +
 lib/eal/x86/include/rte_pmu_pmc.h | 33 +++++++++++++++++++++++++++++++
 4 files changed, 37 insertions(+), 1 deletion(-)
 create mode 100644 lib/eal/x86/include/rte_pmu_pmc.h

diff --git a/app/test/test_pmu.c b/app/test/test_pmu.c
index e19819c31a..79f83a1925 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)
        event = rte_pmu_add_event("cpu_cycles");
+#elif defined(RTE_ARCH_X86_64)
+       event = rte_pmu_add_event("cpu-cycles");
 #endif
 
        while (tries--)
diff --git a/lib/eal/include/rte_pmu.h b/lib/eal/include/rte_pmu.h
index 9185d05ca3..0345746940 100644
--- a/lib/eal/include/rte_pmu.h
+++ b/lib/eal/include/rte_pmu.h
@@ -20,7 +20,7 @@ extern "C" {
 #include <rte_branch_prediction.h>
 #include <rte_lcore.h>
 #include <rte_log.h>
-#if defined(RTE_ARCH_ARM64)
+#if defined(RTE_ARCH_ARM64) || defined(RTE_ARCH_X86_64)
 #include <rte_pmu_pmc.h>
 #endif
 
diff --git a/lib/eal/x86/include/meson.build b/lib/eal/x86/include/meson.build
index 52d2f8e969..03d286ed25 100644
--- a/lib/eal/x86/include/meson.build
+++ b/lib/eal/x86/include/meson.build
@@ -9,6 +9,7 @@ arch_headers = files(
         'rte_io.h',
         'rte_memcpy.h',
         'rte_pause.h',
+        'rte_pmu_pmc.h',
         'rte_power_intrinsics.h',
         'rte_prefetch.h',
         'rte_rtm.h',
diff --git a/lib/eal/x86/include/rte_pmu_pmc.h 
b/lib/eal/x86/include/rte_pmu_pmc.h
new file mode 100644
index 0000000000..f241b80bc9
--- /dev/null
+++ b/lib/eal/x86/include/rte_pmu_pmc.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2023 Marvell.
+ */
+
+#ifndef _RTE_PMU_PMC_X86_H_
+#define _RTE_PMU_PMC_X86_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#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
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_PMU_PMC_X86_H_ */
-- 
2.34.1