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package main
import (
"fmt"
"io/ioutil"
"path"
"path/filepath"
"strings"
"golang.fcuny.net/numap/internal/hwids"
"golang.fcuny.net/numap/internal/sysfs"
)
const (
node_root = "/sys/devices/system/node/node*"
CLASS_NVMe = 67586
CLASS_ETHERNET = 131072
CLASS_GPU = 197120
)
type node struct {
Name string `json:"name"`
Path string `json:"path"`
CpuList string `json:"cpulist"`
PCIDevices []PCIDevice `json:"pci_devices"`
}
type PCIDevice struct {
Vendor string `json:"vendor"`
Name string `json:"name"`
}
func findNodes(hwdb hwids.PciDevices) (map[string]node, error) {
nodes := make(map[string]node)
files, err := filepath.Glob(node_root)
if err != nil {
return nil, fmt.Errorf("Failed to find NUMA nodes under %s: %+v", node_root, err)
}
if len(files) == 0 {
return nil, fmt.Errorf("Could not find NUMA node in %s", node_root)
}
for _, f := range files {
n, err := newNode(f)
if err != nil {
return make(map[string]node), err
}
nodes[n.Name] = n
}
r, err := mapPCIDevicesToNumaNode(hwdb)
if err != nil {
panic(err)
}
for k, v := range r {
nodeName := fmt.Sprintf("node%d", k)
n := nodes[nodeName]
n.PCIDevices = v
nodes[nodeName] = n
}
return nodes, nil
}
func mapPCIDevicesToNumaNode(hwdb hwids.PciDevices) (map[int][]PCIDevice, error) {
devices := sysfs.ScanPCIDevices()
r := map[int][]PCIDevice{}
for _, d := range devices {
if d.Class == CLASS_NVMe || d.Class == CLASS_ETHERNET || d.Class == CLASS_GPU {
_, ok := hwdb[uint16(d.Vendor)]
if ok {
desc := hwdb[uint16(d.Vendor)]
var vendor, name string
for _, m := range desc {
if uint64(m.Device) == d.Device && uint64(m.Vendor) == d.Vendor {
vendor = m.VendorName
name = m.DeviceName
break
}
}
pciDevice := PCIDevice{
Vendor: vendor,
Name: name,
}
r[d.NumaNode] = append(r[d.NumaNode], pciDevice)
}
}
}
return r, nil
}
func newNode(p string) (node, error) {
_, name := path.Split(p)
cpulist, err := cpuList(p)
if err != nil {
return node{}, err
}
return node{
Name: name,
Path: p,
CpuList: cpulist,
PCIDevices: []PCIDevice{},
}, nil
}
func cpuList(p string) (string, error) {
lpath := filepath.Join(p, "cpulist")
c, err := ioutil.ReadFile(lpath)
if err != nil {
return "", fmt.Errorf("Failed to open %s: %+v", lpath, err)
}
return strings.TrimRight(string(c), "\n"), nil
}
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