mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-23 00:38:26 +00:00
d52dbeaa7a
This changes splits the functionality in the internal system package into two packages: one for dealing with devices and one for dealing with kernel modules. This removes ambiguity around the meaning of driver / device roots in each case. In each case, a root can be specified where device nodes are created or kernel modules loaded. Signed-off-by: Evan Lezar <elezar@nvidia.com>
96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
/**
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# Copyright (c) NVIDIA CORPORATION. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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**/
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package devchar
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import (
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"path/filepath"
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"strings"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/logger"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup"
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"golang.org/x/sys/unix"
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)
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type nodeLister interface {
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DeviceNodes() ([]deviceNode, error)
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}
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type existing struct {
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logger logger.Interface
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devRoot string
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}
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// DeviceNodes returns a list of NVIDIA device nodes in the specified root.
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// The nvidia-nvswitch* and nvidia-nvlink devices are excluded.
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func (m existing) DeviceNodes() ([]deviceNode, error) {
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locator := lookup.NewCharDeviceLocator(
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lookup.WithLogger(m.logger),
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lookup.WithRoot(m.devRoot),
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lookup.WithOptional(true),
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)
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devices, err := locator.Locate("/dev/nvidia*")
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if err != nil {
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m.logger.Warningf("Error while locating device: %v", err)
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}
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capDevices, err := locator.Locate("/dev/nvidia-caps/nvidia-*")
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if err != nil {
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m.logger.Warningf("Error while locating caps device: %v", err)
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}
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if len(devices) == 0 && len(capDevices) == 0 {
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m.logger.Infof("No NVIDIA devices found in %s", m.devRoot)
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return nil, nil
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}
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var deviceNodes []deviceNode
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for _, d := range append(devices, capDevices...) {
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if m.nodeIsBlocked(d) {
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continue
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}
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var stat unix.Stat_t
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err := unix.Stat(d, &stat)
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if err != nil {
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m.logger.Warningf("Could not stat device: %v", err)
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continue
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}
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deviceNode := deviceNode{
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path: d,
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major: unix.Major(uint64(stat.Rdev)),
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minor: unix.Minor(uint64(stat.Rdev)),
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}
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deviceNodes = append(deviceNodes, deviceNode)
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}
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return deviceNodes, nil
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}
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// nodeIsBlocked returns true if the specified device node should be ignored.
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func (m existing) nodeIsBlocked(path string) bool {
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blockedPrefixes := []string{"nvidia-fs", "nvidia-nvswitch", "nvidia-nvlink"}
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nodeName := filepath.Base(path)
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for _, prefix := range blockedPrefixes {
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if strings.HasPrefix(nodeName, prefix) {
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return true
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}
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}
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return false
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}
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