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Merge pull request containerd#7636 from fangn2/fix-cpu-architecture-d…
…etection-issue-on-arm Fix cpu architecture detection issue on linux/arm
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/* | ||
Copyright The containerd 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. | ||
*/ | ||
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package platforms | ||
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import ( | ||
"bufio" | ||
"bytes" | ||
"fmt" | ||
"os" | ||
"runtime" | ||
"strings" | ||
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"github.com/containerd/containerd/errdefs" | ||
"golang.org/x/sys/unix" | ||
) | ||
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// getMachineArch retrieves the machine architecture through system call | ||
func getMachineArch() (string, error) { | ||
var uname unix.Utsname | ||
err := unix.Uname(&uname) | ||
if err != nil { | ||
return "", err | ||
} | ||
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arch := string(uname.Machine[:bytes.IndexByte(uname.Machine[:], 0)]) | ||
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return arch, nil | ||
} | ||
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// For Linux, the kernel has already detected the ABI, ISA and Features. | ||
// So we don't need to access the ARM registers to detect platform information | ||
// by ourselves. We can just parse these information from /proc/cpuinfo | ||
func getCPUInfo(pattern string) (info string, err error) { | ||
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cpuinfo, err := os.Open("/proc/cpuinfo") | ||
if err != nil { | ||
return "", err | ||
} | ||
defer cpuinfo.Close() | ||
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// Start to Parse the Cpuinfo line by line. For SMP SoC, we parse | ||
// the first core is enough. | ||
scanner := bufio.NewScanner(cpuinfo) | ||
for scanner.Scan() { | ||
newline := scanner.Text() | ||
list := strings.Split(newline, ":") | ||
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if len(list) > 1 && strings.EqualFold(strings.TrimSpace(list[0]), pattern) { | ||
return strings.TrimSpace(list[1]), nil | ||
} | ||
} | ||
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// Check whether the scanner encountered errors | ||
err = scanner.Err() | ||
if err != nil { | ||
return "", err | ||
} | ||
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return "", fmt.Errorf("getCPUInfo for pattern %s: %w", pattern, errdefs.ErrNotFound) | ||
} | ||
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// getCPUVariantFromArch get CPU variant from arch through a system call | ||
func getCPUVariantFromArch(arch string) (string, error) { | ||
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var variant string | ||
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arch = strings.ToLower(arch) | ||
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if arch == "aarch64" { | ||
variant = "8" | ||
} else if arch[0:4] == "armv" && len(arch) >= 5 { | ||
//Valid arch format is in form of armvXx | ||
switch arch[3:5] { | ||
case "v8": | ||
variant = "8" | ||
case "v7": | ||
variant = "7" | ||
case "v6": | ||
variant = "6" | ||
case "v5": | ||
variant = "5" | ||
case "v4": | ||
variant = "4" | ||
case "v3": | ||
variant = "3" | ||
default: | ||
variant = "unknown" | ||
} | ||
} else { | ||
return "", fmt.Errorf("getCPUVariantFromArch invalid arch: %s, %w", arch, errdefs.ErrInvalidArgument) | ||
} | ||
return variant, nil | ||
} | ||
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// getCPUVariant returns cpu variant for ARM | ||
// We first try reading "Cpu architecture" field from /proc/cpuinfo | ||
// If we can't find it, then fall back using a system call | ||
// This is to cover running ARM in emulated environment on x86 host as this field in /proc/cpuinfo | ||
// was not present. | ||
func getCPUVariant() (string, error) { | ||
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variant, err := getCPUInfo("Cpu architecture") | ||
if err != nil { | ||
if errdefs.IsNotFound(err) { | ||
//Let's try getting CPU variant from machine architecture | ||
arch, err := getMachineArch() | ||
if err != nil { | ||
return "", fmt.Errorf("failure getting machine architecture: %v", err) | ||
} | ||
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variant, err = getCPUVariantFromArch(arch) | ||
if err != nil { | ||
return "", fmt.Errorf("failure getting CPU variant from machine architecture: %v", err) | ||
} | ||
} else { | ||
return "", fmt.Errorf("failure getting CPU variant: %v", err) | ||
} | ||
} | ||
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// handle edge case for Raspberry Pi ARMv6 devices (which due to a kernel quirk, report "CPU architecture: 7") | ||
// https://www.raspberrypi.org/forums/viewtopic.php?t=12614 | ||
if runtime.GOARCH == "arm" && variant == "7" { | ||
model, err := getCPUInfo("model name") | ||
if err == nil && strings.HasPrefix(strings.ToLower(model), "armv6-compatible") { | ||
variant = "6" | ||
} | ||
} | ||
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switch strings.ToLower(variant) { | ||
case "8", "aarch64": | ||
variant = "v8" | ||
case "7", "7m", "?(12)", "?(13)", "?(14)", "?(15)", "?(16)", "?(17)": | ||
variant = "v7" | ||
case "6", "6tej": | ||
variant = "v6" | ||
case "5", "5t", "5te", "5tej": | ||
variant = "v5" | ||
case "4", "4t": | ||
variant = "v4" | ||
case "3": | ||
variant = "v3" | ||
default: | ||
variant = "unknown" | ||
} | ||
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return variant, nil | ||
} |
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