mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2024-12-15 17:50:49 +00:00
91 lines
3.1 KiB
Go
91 lines
3.1 KiB
Go
//go:build amd64
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// +build amd64
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/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cpu
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import (
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"sigs.k8s.io/node-feature-discovery/pkg/cpuid"
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)
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const (
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// CPUID EAX input values
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LEAF_EXT_FEATURE_FLAGS = 0x07
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LEAF_RDT_MONITORING = 0x0f
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LEAF_RDT_ALLOCATION = 0x10
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// CPUID ECX input values
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RDT_MONITORING_SUBLEAF_L3 = 1
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// CPUID bitmasks
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EXT_FEATURE_FLAGS_EBX_RDT_M = 1 << 12
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EXT_FEATURE_FLAGS_EBX_RDT_A = 1 << 15
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RDT_MONITORING_EDX_L3_MONITORING = 1 << 1
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RDT_MONITORING_SUBLEAF_L3_EDX_L3_OCCUPANCY_MONITORING = 1 << 0
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RDT_MONITORING_SUBLEAF_L3_EDX_L3_TOTAL_BANDWIDTH_MONITORING = 1 << 1
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RDT_MONITORING_SUBLEAF_L3_EDX_L3_LOCAL_BANDWIDTH_MONITORING = 1 << 2
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RDT_ALLOCATION_EBX_L3_CACHE_ALLOCATION = 1 << 1
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RDT_ALLOCATION_EBX_L2_CACHE_ALLOCATION = 1 << 2
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RDT_ALLOCATION_EBX_MEMORY_BANDWIDTH_ALLOCATION = 1 << 3
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)
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func discoverRDT() []string {
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features := []string{}
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// Read cpuid information
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extFeatures := cpuid.Cpuid(LEAF_EXT_FEATURE_FLAGS, 0)
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rdtMonitoring := cpuid.Cpuid(LEAF_RDT_MONITORING, 0)
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rdtL3Monitoring := cpuid.Cpuid(LEAF_RDT_MONITORING, RDT_MONITORING_SUBLEAF_L3)
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rdtAllocation := cpuid.Cpuid(LEAF_RDT_ALLOCATION, 0)
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// Detect RDT monitoring capabilities
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if extFeatures.EBX&EXT_FEATURE_FLAGS_EBX_RDT_M != 0 {
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if rdtMonitoring.EDX&RDT_MONITORING_EDX_L3_MONITORING != 0 {
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// Monitoring is supported
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features = append(features, "RDTMON")
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// Cache Monitoring Technology (L3 occupancy monitoring)
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if rdtL3Monitoring.EDX&RDT_MONITORING_SUBLEAF_L3_EDX_L3_OCCUPANCY_MONITORING != 0 {
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features = append(features, "RDTCMT")
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}
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// Memore Bandwidth Monitoring (L3 local&total bandwidth monitoring)
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if rdtL3Monitoring.EDX&RDT_MONITORING_SUBLEAF_L3_EDX_L3_TOTAL_BANDWIDTH_MONITORING != 0 &&
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rdtL3Monitoring.EDX&RDT_MONITORING_SUBLEAF_L3_EDX_L3_LOCAL_BANDWIDTH_MONITORING != 0 {
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features = append(features, "RDTMBM")
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}
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}
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}
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// Detect RDT allocation capabilities
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if extFeatures.EBX&EXT_FEATURE_FLAGS_EBX_RDT_A != 0 {
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// L3 Cache Allocation
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if rdtAllocation.EBX&RDT_ALLOCATION_EBX_L3_CACHE_ALLOCATION != 0 {
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features = append(features, "RDTL3CA")
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}
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// L2 Cache Allocation
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if rdtAllocation.EBX&RDT_ALLOCATION_EBX_L2_CACHE_ALLOCATION != 0 {
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features = append(features, "RDTL2CA")
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}
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// Memory Bandwidth Allocation
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if rdtAllocation.EBX&RDT_ALLOCATION_EBX_MEMORY_BANDWIDTH_ALLOCATION != 0 {
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features = append(features, "RDTMBA")
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}
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}
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return features
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}
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