github.com/containerd/Containerd@v1.4.13/platforms/cpuinfo.go (about)

     1  /*
     2     Copyright The containerd Authors.
     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 platforms
    18  
    19  import (
    20  	"bufio"
    21  	"os"
    22  	"runtime"
    23  	"strings"
    24  
    25  	"github.com/containerd/containerd/errdefs"
    26  	"github.com/containerd/containerd/log"
    27  	"github.com/pkg/errors"
    28  )
    29  
    30  // Present the ARM instruction set architecture, eg: v7, v8
    31  var cpuVariant string
    32  
    33  func init() {
    34  	if isArmArch(runtime.GOARCH) {
    35  		cpuVariant = getCPUVariant()
    36  	} else {
    37  		cpuVariant = ""
    38  	}
    39  }
    40  
    41  // For Linux, the kernel has already detected the ABI, ISA and Features.
    42  // So we don't need to access the ARM registers to detect platform information
    43  // by ourselves. We can just parse these information from /proc/cpuinfo
    44  func getCPUInfo(pattern string) (info string, err error) {
    45  	if !isLinuxOS(runtime.GOOS) {
    46  		return "", errors.Wrapf(errdefs.ErrNotImplemented, "getCPUInfo for OS %s", runtime.GOOS)
    47  	}
    48  
    49  	cpuinfo, err := os.Open("/proc/cpuinfo")
    50  	if err != nil {
    51  		return "", err
    52  	}
    53  	defer cpuinfo.Close()
    54  
    55  	// Start to Parse the Cpuinfo line by line. For SMP SoC, we parse
    56  	// the first core is enough.
    57  	scanner := bufio.NewScanner(cpuinfo)
    58  	for scanner.Scan() {
    59  		newline := scanner.Text()
    60  		list := strings.Split(newline, ":")
    61  
    62  		if len(list) > 1 && strings.EqualFold(strings.TrimSpace(list[0]), pattern) {
    63  			return strings.TrimSpace(list[1]), nil
    64  		}
    65  	}
    66  
    67  	// Check whether the scanner encountered errors
    68  	err = scanner.Err()
    69  	if err != nil {
    70  		return "", err
    71  	}
    72  
    73  	return "", errors.Wrapf(errdefs.ErrNotFound, "getCPUInfo for pattern: %s", pattern)
    74  }
    75  
    76  func getCPUVariant() string {
    77  	if runtime.GOOS == "windows" || runtime.GOOS == "darwin" {
    78  		// Windows/Darwin only supports v7 for ARM32 and v8 for ARM64 and so we can use
    79  		// runtime.GOARCH to determine the variants
    80  		var variant string
    81  		switch runtime.GOARCH {
    82  		case "arm64":
    83  			variant = "v8"
    84  		case "arm":
    85  			variant = "v7"
    86  		default:
    87  			variant = "unknown"
    88  		}
    89  
    90  		return variant
    91  	}
    92  
    93  	variant, err := getCPUInfo("Cpu architecture")
    94  	if err != nil {
    95  		log.L.WithError(err).Error("failure getting variant")
    96  		return ""
    97  	}
    98  
    99  	switch strings.ToLower(variant) {
   100  	case "8", "aarch64":
   101  		// special case: if running a 32-bit userspace on aarch64, the variant should be "v7"
   102  		if runtime.GOARCH == "arm" {
   103  			variant = "v7"
   104  		} else {
   105  			variant = "v8"
   106  		}
   107  	case "7", "7m", "?(12)", "?(13)", "?(14)", "?(15)", "?(16)", "?(17)":
   108  		variant = "v7"
   109  	case "6", "6tej":
   110  		variant = "v6"
   111  	case "5", "5t", "5te", "5tej":
   112  		variant = "v5"
   113  	case "4", "4t":
   114  		variant = "v4"
   115  	case "3":
   116  		variant = "v3"
   117  	default:
   118  		variant = "unknown"
   119  	}
   120  
   121  	return variant
   122  }