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gpu_fakedev: better dra support
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This adds generation of the sys/bus folder files, so that dra
can use the generated files to an extent.

Signed-off-by: Ukri Niemimuukko <[email protected]>
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@uniemimu
uniemimu committed Sep 6, 2023
1 parent 17d923a commit 7ed30b2
Showing 1 changed file with 56 additions and 20 deletions.
76 changes: 56 additions & 20 deletions cmd/gpu_fakedev/gpu_fakedev.go
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,8 @@ import (
"io/fs"
"log"
"os"
"path/filepath"
"strconv"

"golang.org/x/sys/unix"
)
Expand Down Expand Up @@ -78,36 +80,36 @@ type genOptions struct {
}

func addSysfsDriTree(root string, opts *genOptions, i int) error {
card := cardBase + i
base := fmt.Sprintf("%s/class/drm/card%d", root, card)
card := fmt.Sprintf("card%d", cardBase+i)
base := filepath.Join(root, "class", "drm", card)

if err := os.MkdirAll(base, dirMode); err != nil {
return err
}
opts.dirs++

data := []byte(fmt.Sprintf("%d", opts.DevMemSize))
file := fmt.Sprintf("%s/lmem_total_bytes", base)
data := []byte(strconv.Itoa(opts.DevMemSize))
file := filepath.Join(base, "lmem_total_bytes")

if err := os.WriteFile(file, data, fileMode); err != nil {
return err
}
opts.files++

path := fmt.Sprintf("%s/device/drm/card%d", base, card)
path := filepath.Join(base, "device", "drm", card)
if err := os.MkdirAll(path, dirMode); err != nil {
return err
}
opts.dirs++

path = fmt.Sprintf("%s/device/drm/renderD%d", base, renderBase+i)
path = filepath.Join(base, "device", "drm", fmt.Sprintf("renderD%d", renderBase+i))
if err := os.Mkdir(path, dirMode); err != nil {
return err
}
opts.dirs++

data = []byte("0x8086")
file = fmt.Sprintf("%s/device/vendor", base)
file = filepath.Join(base, "device", "vendor")

if err := os.WriteFile(file, data, fileMode); err != nil {
return err
Expand All @@ -119,17 +121,17 @@ func addSysfsDriTree(root string, opts *genOptions, i int) error {
node = i / opts.DevsPerNode
}

data = []byte(fmt.Sprintf("%d", node))
file = fmt.Sprintf("%s/device/numa_node", base)
data = []byte(strconv.Itoa(node))
file = filepath.Join(base, "device", "numa_node")

if err := os.WriteFile(file, data, fileMode); err != nil {
return err
}
opts.files++

if opts.VfsPerPf > 0 && i%(opts.VfsPerPf+1) == 0 {
data = []byte(fmt.Sprintf("%d", opts.VfsPerPf))
file = fmt.Sprintf("%s/device/sriov_numvfs", base)
data = []byte(strconv.Itoa(opts.VfsPerPf))
file = filepath.Join(base, "device", "sriov_numvfs")

if err := os.WriteFile(file, data, fileMode); err != nil {
return err
Expand All @@ -138,7 +140,7 @@ func addSysfsDriTree(root string, opts *genOptions, i int) error {
}

for tile := 0; tile < opts.TilesPerDev; tile++ {
path := fmt.Sprintf("%s/gt/gt%d", base, tile)
path := filepath.Join(base, "gt", fmt.Sprintf("gt%d", tile))
if err := os.MkdirAll(path, dirMode); err != nil {
return err
}
Expand All @@ -148,24 +150,44 @@ func addSysfsDriTree(root string, opts *genOptions, i int) error {
return nil
}

func addDevfsDriTree(root string, opts *genOptions, i int) error {
base := fmt.Sprintf("%s/dri", root)
func addSysfsBusTree(root string, opts *genOptions, i int) error {
pciName := fmt.Sprintf("0000:00:0%d.0", i)
base := filepath.Join(root, "bus", "pci", "drivers", "i915", pciName)

if err := os.MkdirAll(base, dirMode); err != nil {
return err
}
opts.dirs++

data := []byte("0x4905")
file := filepath.Join(base, "device")

if err := os.WriteFile(file, data, fileMode); err != nil {
return err
}
opts.files++

drm := filepath.Join(base, "drm")
if err := os.MkdirAll(drm, dirMode); err != nil {
return err
}
opts.dirs++

return addDeviceNodes(drm, opts, i)
}

func addDeviceNodes(base string, opts *genOptions, i int) error {
mode := uint32(fileMode | devNullType)
devid := int(unix.Mkdev(uint32(devNullMajor), uint32(devNullMinor)))

file := fmt.Sprintf("%s/card%d", base, cardBase+i)
file := filepath.Join(base, fmt.Sprintf("card%d", cardBase+i))
if err := unix.Mknod(file, mode, devid); err != nil {
return fmt.Errorf("NULL device (%d:%d) node creation failed for '%s': %w",
devNullMajor, devNullMinor, file, err)
}
opts.devs++

file = fmt.Sprintf("%s/renderD%d", base, renderBase+i)
file = filepath.Join(base, fmt.Sprintf("renderD%d", renderBase+i))
if err := unix.Mknod(file, mode, devid); err != nil {
return fmt.Errorf("NULL device (%d:%d) node creation failed for '%s': %w",
devNullMajor, devNullMinor, file, err)
Expand All @@ -175,14 +197,24 @@ func addDevfsDriTree(root string, opts *genOptions, i int) error {
return nil
}

func addDevfsDriTree(root string, opts *genOptions, i int) error {
base := filepath.Join(root, "dri")
if err := os.MkdirAll(base, dirMode); err != nil {
return err
}
opts.dirs++

return addDeviceNodes(base, opts, i)
}

func addDebugfsDriTree(root string, opts *genOptions, i int) error {
base := fmt.Sprintf("%s/kernel/debug/dri/%d", root, i)
base := filepath.Join(root, "kernel", "debug", "dri", strconv.Itoa(i))
if err := os.MkdirAll(base, dirMode); err != nil {
return err
}
opts.dirs++

path := fmt.Sprintf("%s/i915_capabilities", base)
path := filepath.Join(base, "i915_capabilities")
f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_EXCL, fileMode)

if err != nil {
Expand Down Expand Up @@ -212,8 +244,8 @@ func removeExistingDir(path, name string) {
return
}

if name == "sysfs" && len(entries) > 2 {
log.Fatalf("ERROR: >2 entries in '%s' - real sysfs?", path)
if name == "sysfs" && len(entries) > 3 {
log.Fatalf("ERROR: >3 entries in '%s' - real sysfs?", path)
}

if name == "devfs" && (entries[0].Name() != "dri" || len(entries) > 1) {
Expand Down Expand Up @@ -251,6 +283,10 @@ func generateDriFiles(opts genOptions) {
if err := addDevfsDriTree(devfsPath, &opts, i); err != nil {
log.Fatalf("ERROR: dev-%d devfs tree generation failed: %v", i, err)
}

if err := addSysfsBusTree(sysfsPath, &opts, i); err != nil {
log.Fatalf("ERROR: dev-%d sysfs bus tree generation failed: %v", i, err)
}
}
log.Printf("Done, created %d dirs, %d devices and %d files.", opts.dirs, opts.devs, opts.files)
}
Expand Down

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