github.com/intel/goresctrl@v0.5.0/pkg/sst/sysfs.go (about)

     1  /*
     2  Copyright 2021 Intel Corporation
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package sst
    18  
    19  import (
    20  	"os"
    21  	"path/filepath"
    22  	"strconv"
    23  	"strings"
    24  
    25  	goresctrlpath "github.com/intel/goresctrl/pkg/path"
    26  	"github.com/intel/goresctrl/pkg/utils"
    27  )
    28  
    29  type cpuPackageInfo struct {
    30  	id   int
    31  	cpus []int
    32  }
    33  
    34  func (pkg *cpuPackageInfo) hasCpus(cpus utils.IDSet) bool {
    35  	return utils.NewIDSetFromIntSlice(pkg.cpus...).Has(cpus.Members()...)
    36  }
    37  
    38  func getOnlineCpuPackages() (map[int]*cpuPackageInfo, error) {
    39  	basePath := goresctrlpath.Path("sys/bus/cpu/devices")
    40  
    41  	files, err := os.ReadDir(basePath)
    42  	if err != nil {
    43  		return nil, err
    44  	}
    45  
    46  	pkgs := make(map[int]*cpuPackageInfo)
    47  
    48  	for _, file := range files {
    49  		// Try to read siblings from topology
    50  		raw, err := os.ReadFile(filepath.Join(basePath, file.Name(), "topology/physical_package_id"))
    51  		if os.IsNotExist(err) {
    52  			// Offline -> topology information does not exist
    53  			continue
    54  		} else if err != nil {
    55  			return nil, err
    56  		}
    57  
    58  		cpuId, err := strconv.Atoi(file.Name()[3:])
    59  		if err != nil {
    60  			return nil, err
    61  		}
    62  
    63  		pkgId, err := strconv.Atoi(strings.TrimSpace(string(raw)))
    64  		if err != nil {
    65  			return nil, err
    66  		}
    67  
    68  		if _, ok := pkgs[pkgId]; !ok {
    69  			pkgs[pkgId] = &cpuPackageInfo{id: pkgId}
    70  		}
    71  		pkgs[pkgId].cpus = append(pkgs[pkgId].cpus, cpuId)
    72  	}
    73  
    74  	return pkgs, nil
    75  }
    76  
    77  func isHWPEnabled() bool {
    78  	status, err := utils.ReadMSR(0, MSR_PM_ENABLE)
    79  	if err != nil {
    80  		return false
    81  	}
    82  
    83  	return (status & 0xff) != 0
    84  }
    85  
    86  func setCPUScalingMin2CPUInfoMinFreq(cpu utils.ID) error {
    87  	freq, err := utils.GetCPUFreqValue(cpu, "cpuinfo_min_freq")
    88  	if err != nil {
    89  		return err
    90  	}
    91  
    92  	return utils.SetCPUScalingMinFreq(cpu, freq)
    93  }
    94  
    95  func setCPUScalingMin2CPUInfoMaxFreq(cpu utils.ID) error {
    96  	freq, err := utils.GetCPUFreqValue(cpu, "cpuinfo_max_freq")
    97  	if err != nil {
    98  		return err
    99  	}
   100  
   101  	return utils.SetCPUScalingMinFreq(cpu, freq)
   102  }