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linux_pci.go
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linux_pci.go
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// Copyright © 2016-2019 Platina Systems, Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package pci
// Linux PCI code
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"syscall"
"unsafe"
)
var sysBusPciPath string = "/sys/bus/pci/devices"
func (d *Device) SysfsPath(format string, args ...interface{}) (path string) {
path = filepath.Join(sysBusPciPath, d.Addr.String(), fmt.Sprintf(format, args...))
return
}
func (d *Device) SysfsOpenFile(format string, mode int, args ...interface{}) (f *os.File, err error) {
fn := d.SysfsPath(format, args...)
f, err = os.OpenFile(fn, mode, 0)
return
}
func (d *Device) SysfsReadHexFile(format string, mode int, args ...interface{}) (v uint, err error) {
var f *os.File
f, err = d.SysfsOpenFile(format, mode, args...)
if err != nil {
return
}
var n int
if n, err = fmt.Fscanf(f, "0x%x", &v); n != 1 || err != nil {
return
}
defer f.Close()
return
}
func (d *Device) ConfigRw(offset, vʹ, nBytes uint, isWrite bool) (v uint) {
f, err := d.SysfsOpenFile("config", os.O_RDWR)
defer func() {
if err != nil {
panic(err)
}
}()
if err != nil {
return
}
defer f.Close()
if _, err = f.Seek(int64(offset), os.SEEK_SET); err != nil {
return
}
var b [4]byte
if isWrite {
for i := range b {
b[i] = byte((vʹ >> uint(8*i)) & 0xff)
}
_, err = f.Write(b[:nBytes])
v = vʹ
} else {
_, err = f.Read(b[:nBytes])
if err == nil {
for i := range b {
v |= uint(b[i]) << (8 * uint(i))
}
}
}
return
}
func (d *Device) ReadRawConfigUint32(o uint) (v uint32) {
v = uint32(d.ConfigRw(o, 0, 4, false))
return
}
func (d *Device) WriteRawConfigUint32(o uint, value uint32) {
d.ConfigRw(o, uint(value), 4, true)
}
func (d *Device) ReadRawConfigUint16(o uint) (v uint16) {
v = uint16(d.ConfigRw(o, 0, 2, false))
return
}
func (d *Device) WriteRawConfigUint16(o uint, value uint16) {
d.ConfigRw(o, uint(value), 2, true)
}
func (d *Device) ReadRawConfigUint8(o uint) (v uint8) {
v = uint8(d.ConfigRw(o, 0, 1, false))
return
}
func (d *Device) WriteRawConfigUint8(o uint, value uint8) {
d.ConfigRw(o, uint(value), 1, true)
}
func (d *Device) ReadConfigUint32(o uint) (v uint32) {
v = uint32(d.BusDevice.ConfigRw(o, 0, 4, false))
return
}
func (d *Device) WriteConfigUint32(o uint, value uint32) {
d.BusDevice.ConfigRw(o, uint(value), 4, true)
}
func (d *Device) ReadConfigUint16(o uint) (v uint16) {
v = uint16(d.BusDevice.ConfigRw(o, 0, 2, false))
return
}
func (d *Device) WriteConfigUint16(o uint, value uint16) {
d.BusDevice.ConfigRw(o, uint(value), 2, true)
}
func (d *Device) ReadConfigUint8(o uint) (v uint8) {
v = uint8(d.BusDevice.ConfigRw(o, 0, 1, false))
return
}
func (d *Device) WriteConfigUint8(o uint, value uint8) {
d.BusDevice.ConfigRw(o, uint(value), 1, true)
}
func (d *Device) MapResource(bar uint) (res uintptr, err error) {
r := &d.Resources[bar]
var f *os.File
f, err = d.SysfsOpenFile("resource%d", os.O_RDWR, r.Index)
if err != nil {
return
}
defer f.Close()
r.Mem, err = syscall.Mmap(int(f.Fd()), 0, int(r.Size), syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED)
if err != nil {
err = fmt.Errorf("mmap resource%d: %s", r.Index, err)
return
}
res = uintptr(unsafe.Pointer(&r.Mem[0]))
return
}
func (d *Device) UnmapResource(bar uint) (err error) {
if d.Resources[bar].Mem != nil {
err = syscall.Munmap(d.Resources[bar].Mem)
if err != nil {
return fmt.Errorf("munmap resource%d: %s", bar, err)
}
}
return
}
// Loop through BARs to find resources.
func (d *Device) findResources() (err error) {
var f *os.File
if f, err = d.SysfsOpenFile("resource", os.O_RDONLY); err != nil {
return
}
defer f.Close()
var b []byte
if b, err = ioutil.ReadAll(f); err != nil {
return
}
r := bytes.NewReader(b)
i := 0
for r.Len() > 0 {
var (
v [3]uint64
n int
)
if n, err = fmt.Fscanf(r, "0x%x 0x%x 0x%x\n", &v[0], &v[1], &v[2]); n != 3 || err != nil {
if n != 3 {
err = fmt.Errorf("short read")
}
return
}
size := v[0]
if v[0] != 0 {
size = 1 + v[1] - v[0]
}
res := Resource{
Index: uint32(i),
Base: v[0],
Size: size,
}
d.Resources = append(d.Resources, res)
i++
}
return
}
func DiscoverDevices(bus Bus) (err error) {
fis, err := ioutil.ReadDir(sysBusPciPath)
if perr, ok := err.(*os.PathError); ok && perr.Err == syscall.ENOENT {
return
}
if err != nil {
return
}
bc := bus.getBusCommon()
for _, fi := range fis {
de := bus.NewDevice()
d := de.GetDevice()
d.BusDevice = de
n := fi.Name()
if _, err = fmt.Sscanf(n, "%x:%x:%x.%x", &d.Addr.Domain, &d.Addr.Bus, &d.Addr.Slot, &d.Addr.Fn); err != nil {
return
}
var driver Driver
// See if we have a registered driver for this device.
{
var i DeviceID
var v [2]uint
v[0], err = d.SysfsReadHexFile("vendor", os.O_RDONLY)
if err != nil {
return
}
v[1], err = d.SysfsReadHexFile("device", os.O_RDONLY)
if err != nil {
return
}
i.Vendor = VendorID(v[0])
i.Device = VendorDeviceID(v[1])
d.ID = i
if driver = GetDriver(i); driver == nil {
continue
}
}
if err = d.findResources(); err != nil {
return
}
d.Driver = driver
if d.DriverDevice, err = driver.NewDevice(de); err != nil {
return
}
bc.registeredDevs = append(bc.registeredDevs, de)
}
// Open all registered devices.
for _, bd := range bc.registeredDevs {
if err = bd.Open(); err != nil {
return
}
}
if err = bus.Validate(); err != nil {
return
}
// Intialize all registered devices that have drivers.
for _, bd := range bc.registeredDevs {
d := bd.GetDevice()
if d.DriverDevice == nil {
continue
}
if err = d.DriverDevice.Init(); err != nil {
return
}
}
return
}
func CloseDiscoveredDevices(bus Bus) (err error) {
bc := bus.getBusCommon()
for _, bd := range bc.registeredDevs {
d := bd.GetDevice()
if d.DriverDevice != nil {
if err = d.DriverDevice.Exit(); err != nil {
return
}
}
if err = bd.Close(); err != nil {
return
}
}
return
}