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// Copyright 2023 The gVisor 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.
package util
import (
"fmt"
"os"
"regexp"
"strconv"
"strings"
"syscall"
"golang.org/x/sys/unix"
"gvisor.dev/gvisor/pkg/abi/tpu"
)
const (
googleVendorID = 0x1AE0
accelDevicePathRegex = `^/dev/accel(\d+)$`
accelSysfsFormat = "/sys/class/accel/accel%d/device/%s"
vfioDevicePathRegex = `^/dev/vfio/(\d+)$`
vfioSysfsFormat = "/sys/class/vfio-dev/vfio%d/device/%s"
vendorFile = "vendor"
deviceFile = "device"
)
var tpuV4DeviceIDs = map[uint64]any{tpu.TPUV4DeviceID: nil, tpu.TPUV4liteDeviceID: nil}
var tpuV5DeviceIDs = map[uint64]any{tpu.TPUV5eDeviceID: nil, tpu.TPUV5pDeviceID: nil}
// ExtractTPUDeviceMinor returns the accelerator device minor number for that
// the passed device path. If the passed device is not a valid TPU device, then
// it returns false.
func ExtractTPUDeviceMinor(path string) (uint32, bool, error) {
devNum, valid, err := tpuV4DeviceMinor(path)
if err != nil {
return 0, false, err
}
if valid {
return devNum, valid, err
}
return tpuV5DeviceMinor(path)
}
// tpuDeviceMinor returns the accelerator device minor number for that
// the passed device path. If the passed device is not a valid TPU device, then
// it returns false.
func tpuDeviceMinor(devicePath, devicePathRegex, sysfsFormat string, allowedDeviceIDs map[uint64]any) (uint32, bool, error) {
deviceRegex := regexp.MustCompile(devicePathRegex)
matches := deviceRegex.FindStringSubmatch(devicePath)
if matches == nil {
return 0, false, nil
}
var st syscall.Stat_t
if err := syscall.Stat(devicePath, &st); err != nil {
return 0, false, err
}
minor := unix.Minor(st.Rdev)
vendor, err := readHexInt(fmt.Sprintf(sysfsFormat, minor, vendorFile))
if err != nil {
return 0, false, err
}
if vendor != googleVendorID {
return 0, false, nil
}
deviceID, err := readHexInt(fmt.Sprintf(sysfsFormat, minor, deviceFile))
if err != nil {
return 0, false, err
}
if _, ok := allowedDeviceIDs[deviceID]; !ok {
return 0, false, nil
}
return minor, true, nil
}
// tpuv4DeviceMinor returns v4 and v4lite TPU device minor number for the given path.
// A valid v4 TPU device is defined as:
// * Path is /dev/accel#.
// * Vendor is googleVendorID.
// * Device ID is one of tpuV4DeviceIDs.
func tpuV4DeviceMinor(path string) (uint32, bool, error) {
return tpuDeviceMinor(path, accelDevicePathRegex, accelSysfsFormat, tpuV4DeviceIDs)
}
// tpuV5DeviceMinor returns the v5e TPU device minor number for te given path.
// A valid v5 TPU device is defined as:
// * Path is /dev/vfio/#.
// * Vendor is googleVendorID.
// * Device ID is one of tpuV5DeviceIDs.
func tpuV5DeviceMinor(path string) (uint32, bool, error) {
return tpuDeviceMinor(path, vfioDevicePathRegex, vfioSysfsFormat, tpuV5DeviceIDs)
}
func readHexInt(path string) (uint64, error) {
data, err := os.ReadFile(path)
if err != nil {
return 0, err
}
numStr := strings.Trim(strings.TrimSpace(strings.TrimPrefix(string(data), "0x")), "\x00")
return strconv.ParseUint(numStr, 16, 64)
}
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