// Copyright 2019 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build linux
// +build linux
package procfs
import (
"bufio"
"bytes"
"errors"
"fmt"
"regexp"
"strconv"
"strings"
"github.com/prometheus/procfs/internal/util"
)
// CPUInfo contains general information about a system CPU found in /proc/cpuinfo.
type CPUInfo struct {
Processor uint
VendorID string
CPUFamily string
Model string
ModelName string
Stepping string
Microcode string
CPUMHz float64
CacheSize string
PhysicalID string
Siblings uint
CoreID string
CPUCores uint
APICID string
InitialAPICID string
FPU string
FPUException string
CPUIDLevel uint
WP string
Flags []string
Bugs []string
BogoMips float64
CLFlushSize uint
CacheAlignment uint
AddressSizes string
PowerManagement string
}
var (
cpuinfoClockRegexp = regexp.MustCompile(`([\d.]+)`)
cpuinfoS390XProcessorRegexp = regexp.MustCompile(`^processor\s+(\d+):.*`)
)
// CPUInfo returns information about current system CPUs.
// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
func (fs FS) CPUInfo() ([]CPUInfo, error) {
data, err := util.ReadFileNoStat(fs.proc.Path("cpuinfo"))
if err != nil {
return nil, err
}
return parseCPUInfo(data)
}
func parseCPUInfoX86(info []byte) ([]CPUInfo, error) {
scanner := bufio.NewScanner(bytes.NewReader(info))
// find the first "processor" line
firstLine := firstNonEmptyLine(scanner)
if !strings.HasPrefix(firstLine, "processor") || !strings.Contains(firstLine, ":") {
return nil, fmt.Errorf("%w: Cannot parse line: %q", ErrFileParse, firstLine)
}
field := strings.SplitN(firstLine, ": ", 2)
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
firstcpu := CPUInfo{Processor: uint(v)}
cpuinfo := []CPUInfo{firstcpu}
i := 0
for scanner.Scan() {
line := scanner.Text()
if !strings.Contains(line, ":") {
continue
}
field := strings.SplitN(line, ": ", 2)
switch strings.TrimSpace(field[0]) {
case "processor":
cpuinfo = append(cpuinfo, CPUInfo{}) // start of the next processor
i++
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
cpuinfo[i].Processor = uint(v)
case "vendor", "vendor_id":
cpuinfo[i].VendorID = field[1]
case "cpu family":
cpuinfo[i].CPUFamily = field[1]
case "model":
cpuinfo[i].Model = field[1]
case "model name":
cpuinfo[i].ModelName = field[1]
case "stepping":
cpuinfo[i].Stepping = field[1]
case "microcode":
cpuinfo[i].Microcode = field[1]
case "cpu MHz":
v, err := strconv.ParseFloat(field[1], 64)
if err != nil {
return nil, err
}
cpuinfo[i].CPUMHz = v
case "cache size":
cpuinfo[i].CacheSize = field[1]
case "physical id":
cpuinfo[i].PhysicalID = field[1]
case "siblings":
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
cpuinfo[i].Siblings = uint(v)
case "core id":
cpuinfo[i].CoreID = field[1]
case "cpu cores":
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
cpuinfo[i].CPUCores = uint(v)
case "apicid":
cpuinfo[i].APICID = field[1]
case "initial apicid":
cpuinfo[i].InitialAPICID = field[1]
case "fpu":
cpuinfo[i].FPU = field[1]
case "fpu_exception":
cpuinfo[i].FPUException = field[1]
case "cpuid level":
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
cpuinfo[i].CPUIDLevel = uint(v)
case "wp":
cpuinfo[i].WP = field[1]
case "flags":
cpuinfo[i].Flags = strings.Fields(field[1])
case "bugs":
cpuinfo[i].Bugs = strings.Fields(field[1])
case "bogomips":
v, err := strconv.ParseFloat(field[1], 64)
if err != nil {
return nil, err
}
cpuinfo[i].BogoMips = v
case "clflush size":
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
cpuinfo[i].CLFlushSize = uint(v)
case "cache_alignment":
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
cpuinfo[i].CacheAlignment = uint(v)
case "address sizes":
cpuinfo[i].AddressSizes = field[1]
case "power management":
cpuinfo[i].PowerManagement = field[1]
}
}
return cpuinfo, nil
}
func parseCPUInfoARM(info []byte) ([]CPUInfo, error) {
scanner := bufio.NewScanner(bytes.NewReader(info))
firstLine := firstNonEmptyLine(scanner)
match, err := regexp.MatchString("^[Pp]rocessor", firstLine)
if !match || !strings.Contains(firstLine, ":") {
return nil, fmt.Errorf("%w: Cannot parse line: %q: %w", ErrFileParse, firstLine, err)
}
field := strings.SplitN(firstLine, ": ", 2)
cpuinfo := []CPUInfo{}
featuresLine := ""
commonCPUInfo := CPUInfo{}
i := 0
if strings.TrimSpace(field[0]) == "Processor" {
commonCPUInfo = CPUInfo{ModelName: field[1]}
i = -1
} else {
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
firstcpu := CPUInfo{Processor: uint(v)}
cpuinfo = []CPUInfo{firstcpu}
}
for scanner.Scan() {
line := scanner.Text()
if !strings.Contains(line, ":") {
continue
}
field := strings.SplitN(line, ": ", 2)
switch strings.TrimSpace(field[0]) {
case "processor":
cpuinfo = append(cpuinfo, commonCPUInfo) // start of the next processor
i++
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
cpuinfo[i].Processor = uint(v)
case "BogoMIPS":
if i == -1 {
cpuinfo = append(cpuinfo, commonCPUInfo) // There is only one processor
i++
cpuinfo[i].Processor = 0
}
v, err := strconv.ParseFloat(field[1], 64)
if err != nil {
return nil, err
}
cpuinfo[i].BogoMips = v
case "Features":
featuresLine = line
case "model name":
cpuinfo[i].ModelName = field[1]
}
}
fields := strings.SplitN(featuresLine, ": ", 2)
for i := range cpuinfo {
cpuinfo[i].Flags = strings.Fields(fields[1])
}
return cpuinfo, nil
}
func parseCPUInfoS390X(info []byte) ([]CPUInfo, error) {
scanner := bufio.NewScanner(bytes.NewReader(info))
firstLine := firstNonEmptyLine(scanner)
if !strings.HasPrefix(firstLine, "vendor_id") || !strings.Contains(firstLine, ":") {
return nil, fmt.Errorf("%w: Cannot parse line: %q", ErrFileParse, firstLine)
}
field := strings.SplitN(firstLine, ": ", 2)
cpuinfo := []CPUInfo{}
commonCPUInfo := CPUInfo{VendorID: field[1]}
for scanner.Scan() {
line := scanner.Text()
if !strings.Contains(line, ":") {
continue
}
field := strings.SplitN(line, ": ", 2)
switch strings.TrimSpace(field[0]) {
case "bogomips per cpu":
v, err := strconv.ParseFloat(field[1], 64)
if err != nil {
return nil, err
}
commonCPUInfo.BogoMips = v
case "features":
commonCPUInfo.Flags = strings.Fields(field[1])
}
if strings.HasPrefix(line, "processor") {
match := cpuinfoS390XProcessorRegexp.FindStringSubmatch(line)
if len(match) < 2 {
return nil, fmt.Errorf("%w: %q", ErrFileParse, firstLine)
}
cpu := commonCPUInfo
v, err := strconv.ParseUint(match[1], 0, 32)
if err != nil {
return nil, err
}
cpu.Processor = uint(v)
cpuinfo = append(cpuinfo, cpu)
}
if strings.HasPrefix(line, "cpu number") {
break
}
}
i := 0
for scanner.Scan() {
line := scanner.Text()
if !strings.Contains(line, ":") {
continue
}
field := strings.SplitN(line, ": ", 2)
switch strings.TrimSpace(field[0]) {
case "cpu number":
i++
case "cpu MHz dynamic":
clock := cpuinfoClockRegexp.FindString(strings.TrimSpace(field[1]))
v, err := strconv.ParseFloat(clock, 64)
if err != nil {
return nil, err
}
cpuinfo[i].CPUMHz = v
case "physical id":
cpuinfo[i].PhysicalID = field[1]
case "core id":
cpuinfo[i].CoreID = field[1]
case "cpu cores":
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
cpuinfo[i].CPUCores = uint(v)
case "siblings":
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
cpuinfo[i].Siblings = uint(v)
}
}
return cpuinfo, nil
}
func parseCPUInfoMips(info []byte) ([]CPUInfo, error) {
scanner := bufio.NewScanner(bytes.NewReader(info))
// find the first "processor" line
firstLine := firstNonEmptyLine(scanner)
if !strings.HasPrefix(firstLine, "system type") || !strings.Contains(firstLine, ":") {
return nil, fmt.Errorf("%w: %q", ErrFileParse, firstLine)
}
field := strings.SplitN(firstLine, ": ", 2)
cpuinfo := []CPUInfo{}
systemType := field[1]
i := 0
for scanner.Scan() {
line := scanner.Text()
if !strings.Contains(line, ":") {
continue
}
field := strings.SplitN(line, ": ", 2)
switch strings.TrimSpace(field[0]) {
case "processor":
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
i = int(v)
cpuinfo = append(cpuinfo, CPUInfo{}) // start of the next processor
cpuinfo[i].Processor = uint(v)
cpuinfo[i].VendorID = systemType
case "cpu model":
cpuinfo[i].ModelName = field[1]
case "BogoMIPS":
v, err := strconv.ParseFloat(field[1], 64)
if err != nil {
return nil, err
}
cpuinfo[i].BogoMips = v
}
}
return cpuinfo, nil
}
func parseCPUInfoLoong(info []byte) ([]CPUInfo, error) {
scanner := bufio.NewScanner(bytes.NewReader(info))
// find the first "processor" line
firstLine := firstNonEmptyLine(scanner)
if !strings.HasPrefix(firstLine, "system type") || !strings.Contains(firstLine, ":") {
return nil, fmt.Errorf("%w: %q", ErrFileParse, firstLine)
}
field := strings.SplitN(firstLine, ": ", 2)
cpuinfo := []CPUInfo{}
systemType := field[1]
i := 0
for scanner.Scan() {
line := scanner.Text()
if !strings.Contains(line, ":") {
continue
}
field := strings.SplitN(line, ": ", 2)
switch strings.TrimSpace(field[0]) {
case "processor":
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
i = int(v)
cpuinfo = append(cpuinfo, CPUInfo{}) // start of the next processor
cpuinfo[i].Processor = uint(v)
cpuinfo[i].VendorID = systemType
case "CPU Family":
cpuinfo[i].CPUFamily = field[1]
case "Model Name":
cpuinfo[i].ModelName = field[1]
}
}
return cpuinfo, nil
}
func parseCPUInfoPPC(info []byte) ([]CPUInfo, error) {
scanner := bufio.NewScanner(bytes.NewReader(info))
firstLine := firstNonEmptyLine(scanner)
if !strings.HasPrefix(firstLine, "processor") || !strings.Contains(firstLine, ":") {
return nil, fmt.Errorf("%w: %q", ErrFileParse, firstLine)
}
field := strings.SplitN(firstLine, ": ", 2)
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
firstcpu := CPUInfo{Processor: uint(v)}
cpuinfo := []CPUInfo{firstcpu}
i := 0
for scanner.Scan() {
line := scanner.Text()
if !strings.Contains(line, ":") {
continue
}
field := strings.SplitN(line, ": ", 2)
switch strings.TrimSpace(field[0]) {
case "processor":
cpuinfo = append(cpuinfo, CPUInfo{}) // start of the next processor
i++
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
cpuinfo[i].Processor = uint(v)
case "cpu":
cpuinfo[i].VendorID = field[1]
case "clock":
clock := cpuinfoClockRegexp.FindString(strings.TrimSpace(field[1]))
v, err := strconv.ParseFloat(clock, 64)
if err != nil {
return nil, err
}
cpuinfo[i].CPUMHz = v
}
}
return cpuinfo, nil
}
func parseCPUInfoRISCV(info []byte) ([]CPUInfo, error) {
scanner := bufio.NewScanner(bytes.NewReader(info))
firstLine := firstNonEmptyLine(scanner)
if !strings.HasPrefix(firstLine, "processor") || !strings.Contains(firstLine, ":") {
return nil, fmt.Errorf("%w: %q", ErrFileParse, firstLine)
}
field := strings.SplitN(firstLine, ": ", 2)
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
firstcpu := CPUInfo{Processor: uint(v)}
cpuinfo := []CPUInfo{firstcpu}
i := 0
for scanner.Scan() {
line := scanner.Text()
if !strings.Contains(line, ":") {
continue
}
field := strings.SplitN(line, ": ", 2)
switch strings.TrimSpace(field[0]) {
case "processor":
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
i = int(v)
cpuinfo = append(cpuinfo, CPUInfo{}) // start of the next processor
cpuinfo[i].Processor = uint(v)
case "hart":
cpuinfo[i].CoreID = field[1]
case "isa":
cpuinfo[i].ModelName = field[1]
}
}
return cpuinfo, nil
}
func parseCPUInfoDummy(_ []byte) ([]CPUInfo, error) { // nolint:unused,deadcode
return nil, errors.New("not implemented")
}
// firstNonEmptyLine advances the scanner to the first non-empty line
// and returns the contents of that line.
func firstNonEmptyLine(scanner *bufio.Scanner) string {
for scanner.Scan() {
line := scanner.Text()
if strings.TrimSpace(line) != "" {
return line
}
}
return ""
}
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