OpenSBI: Added PMU(Performance Monitoring Unit) extension

kernel/drivers/opensbi/extensions/pmu.cpp

@@ -0,0 +1,85 @@
+#include "opensbi/extensions/pmu.h"
+
+namespace drivers {
+namespace opensbi::pmu {
+
+    namespace {
+        enum class ExtensionId {
+            PMU = 0x504D55
+        };
+
+        enum class FunctionId {
+            NUM_COUNTERS,
+            COUNTER_GET_INFO,
+            COUNTER_CONFIG_MATCHING,
+            COUNTER_START,
+            COUNTER_STOP,
+            COUNTER_FW_READ
+        };
+    }
+
+    SbiRet num_counters() {
+        return ecall(
+            static_cast<sbiword_t>(ExtensionId::PMU),
+            static_cast<sbiword_t>(FunctionId::NUM_COUNTERS));
+    }
+
+    SbiRet counter_get_info(unsigned long counter_idx) {
+        return ecall(
+            static_cast<sbiword_t>(ExtensionId::PMU),
+            static_cast<sbiword_t>(FunctionId::COUNTER_GET_INFO),
+            counter_idx);
+    }
+
+    SbiRet counter_config_matching(
+            unsigned long counter_idx_base,
+            unsigned long counter_idx_mask,
+            unsigned long config_flags,
+            unsigned long event_idx,
+            uint64_t event_data) {
+        return ecall(
+            static_cast<sbiword_t>(ExtensionId::PMU),
+            static_cast<sbiword_t>(FunctionId::COUNTER_CONFIG_MATCHING),
+            counter_idx_base,
+            counter_idx_mask,
+            config_flags,
+            event_idx,
+            event_data);
+    }
+
+    SbiRet counter_start(
+            unsigned long counter_idx_base,
+            unsigned long counter_idx_mask,
+            unsigned long start_flags,
+            uint64_t initial_value) {
+        return ecall(
+            static_cast<sbiword_t>(ExtensionId::PMU),
+            static_cast<sbiword_t>(FunctionId::COUNTER_START),
+            counter_idx_base,
+            counter_idx_mask,
+            start_flags,
+            initial_value);
+    }
+
+    SbiRet counter_stop(
+            unsigned long counter_idx_base,
+            unsigned long counter_idx_mask,
+            unsigned long stop_flags) {
+        return ecall(
+            static_cast<sbiword_t>(ExtensionId::PMU),
+            static_cast<sbiword_t>(FunctionId::COUNTER_STOP),
+            counter_idx_base,
+            counter_idx_mask,
+            stop_flags);
+    }
+
+    SbiRet counter_fw_read(unsigned long counter_idx) {
+        return ecall(
+            static_cast<sbiword_t>(ExtensionId::PMU),
+            static_cast<sbiword_t>(FunctionId::COUNTER_FW_READ),
+            counter_idx);
+    }
+
+}  // End namespace opensbi::pmu
+}  // End namespace drivers
+

kernel/drivers/opensbi/include/opensbi/extensions/pmu.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "opensbi/opensbi.h"
+
+namespace drivers {
+namespace opensbi::pmu {
+
+    SbiRet num_counters();
+
+    SbiRet counter_get_info(unsigned long counter_idx);
+
+    SbiRet counter_config_matching(
+            unsigned long counter_idx_base,
+            unsigned long counter_idx_mask,
+            unsigned long config_flags,
+            unsigned long event_idx,
+            uint64_t event_data);
+
+    SbiRet counter_start(
+            unsigned long counter_idx_base,
+            unsigned long counter_idx_mask,
+            unsigned long start_flags,
+            uint64_t initial_value);
+
+    SbiRet counter_stop(
+            unsigned long counter_idx_base,
+            unsigned long counter_idx_mask,
+            unsigned long stop_flags);
+
+    SbiRet counter_fw_read(unsigned long counter_idx);
+
+}  // End namespace opensbi::pmu
+}  // End namespace drivers

kernel/drivers/opensbi/meson.build

@@ -7,7 +7,8 @@ kernel_sources += [
         'extensions/ipi.cpp',
         'extensions/rfence.cpp',
         'extensions/hsm.cpp',
-        'extensions/srst.cpp'
+        'extensions/srst.cpp',
+        'extensions/pmu.cpp'
     ),
 ]