Rename gpu package discover (#7143)

Cleaning up go package naming

discover/amd_hip_windows.go

@@ -0,0 +1,147 @@
+package discover
+
+import (
+	"errors"
+	"fmt"
+	"log/slog"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+const (
+	hipSuccess       = 0
+	hipErrorNoDevice = 100
+)
+
+type hipDevicePropMinimal struct {
+	Name        [256]byte
+	unused1     [140]byte
+	GcnArchName [256]byte // gfx####
+	iGPU        int       // Doesn't seem to actually report correctly
+	unused2     [128]byte
+}
+
+// Wrap the amdhip64.dll library for GPU discovery
+type HipLib struct {
+	dll                    windows.Handle
+	hipGetDeviceCount      uintptr
+	hipGetDeviceProperties uintptr
+	hipMemGetInfo          uintptr
+	hipSetDevice           uintptr
+	hipDriverGetVersion    uintptr
+}
+
+func NewHipLib() (*HipLib, error) {
+	// At runtime we depend on v6, so discover GPUs with the same library for a consistent set of GPUs
+	h, err := windows.LoadLibrary("amdhip64_6.dll")
+	if err != nil {
+		return nil, fmt.Errorf("unable to load amdhip64_6.dll, please make sure to upgrade to the latest amd driver: %w", err)
+	}
+	hl := &HipLib{}
+	hl.dll = h
+	hl.hipGetDeviceCount, err = windows.GetProcAddress(hl.dll, "hipGetDeviceCount")
+	if err != nil {
+		return nil, err
+	}
+	hl.hipGetDeviceProperties, err = windows.GetProcAddress(hl.dll, "hipGetDeviceProperties")
+	if err != nil {
+		return nil, err
+	}
+	hl.hipMemGetInfo, err = windows.GetProcAddress(hl.dll, "hipMemGetInfo")
+	if err != nil {
+		return nil, err
+	}
+	hl.hipSetDevice, err = windows.GetProcAddress(hl.dll, "hipSetDevice")
+	if err != nil {
+		return nil, err
+	}
+	hl.hipDriverGetVersion, err = windows.GetProcAddress(hl.dll, "hipDriverGetVersion")
+	if err != nil {
+		return nil, err
+	}
+	return hl, nil
+}
+
+// The hip library only evaluates the HIP_VISIBLE_DEVICES variable at startup
+// so we have to unload/reset the library after we do our initial discovery
+// to make sure our updates to that variable are processed by llama.cpp
+func (hl *HipLib) Release() {
+	err := windows.FreeLibrary(hl.dll)
+	if err != nil {
+		slog.Warn("failed to unload amdhip64.dll", "error", err)
+	}
+	hl.dll = 0
+}
+
+func (hl *HipLib) AMDDriverVersion() (driverMajor, driverMinor int, err error) {
+	if hl.dll == 0 {
+		return 0, 0, errors.New("dll has been unloaded")
+	}
+	var version int
+	status, _, err := syscall.SyscallN(hl.hipDriverGetVersion, uintptr(unsafe.Pointer(&version)))
+	if status != hipSuccess {
+		return 0, 0, fmt.Errorf("failed call to hipDriverGetVersion: %d %s", status, err)
+	}
+
+	slog.Debug("hipDriverGetVersion", "version", version)
+	driverMajor = version / 10000000
+	driverMinor = (version - (driverMajor * 10000000)) / 100000
+
+	return driverMajor, driverMinor, nil
+}
+
+func (hl *HipLib) HipGetDeviceCount() int {
+	if hl.dll == 0 {
+		slog.Error("dll has been unloaded")
+		return 0
+	}
+	var count int
+	status, _, err := syscall.SyscallN(hl.hipGetDeviceCount, uintptr(unsafe.Pointer(&count)))
+	if status == hipErrorNoDevice {
+		slog.Info("AMD ROCm reports no devices found")
+		return 0
+	}
+	if status != hipSuccess {
+		slog.Warn("failed call to hipGetDeviceCount", "status", status, "error", err)
+	}
+	return count
+}
+
+func (hl *HipLib) HipSetDevice(device int) error {
+	if hl.dll == 0 {
+		return errors.New("dll has been unloaded")
+	}
+	status, _, err := syscall.SyscallN(hl.hipSetDevice, uintptr(device))
+	if status != hipSuccess {
+		return fmt.Errorf("failed call to hipSetDevice: %d %s", status, err)
+	}
+	return nil
+}
+
+func (hl *HipLib) HipGetDeviceProperties(device int) (*hipDevicePropMinimal, error) {
+	if hl.dll == 0 {
+		return nil, errors.New("dll has been unloaded")
+	}
+	var props hipDevicePropMinimal
+	status, _, err := syscall.SyscallN(hl.hipGetDeviceProperties, uintptr(unsafe.Pointer(&props)), uintptr(device))
+	if status != hipSuccess {
+		return nil, fmt.Errorf("failed call to hipGetDeviceProperties: %d %s", status, err)
+	}
+	return &props, nil
+}
+
+// free, total, err
+func (hl *HipLib) HipMemGetInfo() (uint64, uint64, error) {
+	if hl.dll == 0 {
+		return 0, 0, errors.New("dll has been unloaded")
+	}
+	var totalMemory uint64
+	var freeMemory uint64
+	status, _, err := syscall.SyscallN(hl.hipMemGetInfo, uintptr(unsafe.Pointer(&freeMemory)), uintptr(unsafe.Pointer(&totalMemory)))
+	if status != hipSuccess {
+		return 0, 0, fmt.Errorf("failed call to hipMemGetInfo: %d %s", status, err)
+	}
+	return freeMemory, totalMemory, nil
+}