Rename gpu package discover (#7143)

Cleaning up go package naming

discover/gpu_darwin.go

@@ -0,0 +1,101 @@
+//go:build darwin
+
+package discover
+
+/*
+#cgo CFLAGS: -x objective-c
+#cgo LDFLAGS: -framework Foundation -framework CoreGraphics -framework Metal
+#include "gpu_info_darwin.h"
+*/
+import "C"
+
+import (
+	"log/slog"
+	"runtime"
+	"syscall"
+
+	"github.com/ollama/ollama/format"
+)
+
+const (
+	metalMinimumMemory = 512 * format.MebiByte
+)
+
+func GetGPUInfo() GpuInfoList {
+	mem, _ := GetCPUMem()
+	if runtime.GOARCH == "amd64" {
+		return []GpuInfo{
+			{
+				Library: "cpu",
+				Variant: GetCPUCapability().String(),
+				memInfo: mem,
+			},
+		}
+	}
+	info := GpuInfo{
+		Library: "metal",
+		ID:      "0",
+	}
+	info.TotalMemory = uint64(C.getRecommendedMaxVRAM())
+
+	// TODO is there a way to gather actual allocated video memory? (currentAllocatedSize doesn't work)
+	info.FreeMemory = info.TotalMemory
+
+	info.MinimumMemory = metalMinimumMemory
+	return []GpuInfo{info}
+}
+
+func GetCPUInfo() GpuInfoList {
+	mem, _ := GetCPUMem()
+	return []GpuInfo{
+		{
+			Library: "cpu",
+			Variant: GetCPUCapability().String(),
+			memInfo: mem,
+		},
+	}
+}
+
+func GetCPUMem() (memInfo, error) {
+	return memInfo{
+		TotalMemory: uint64(C.getPhysicalMemory()),
+		FreeMemory:  uint64(C.getFreeMemory()),
+		// FreeSwap omitted as Darwin uses dynamic paging
+	}, nil
+}
+
+func (l GpuInfoList) GetVisibleDevicesEnv() (string, string) {
+	// No-op on darwin
+	return "", ""
+}
+
+func GetSystemInfo() SystemInfo {
+	mem, _ := GetCPUMem()
+	query := "hw.perflevel0.physicalcpu"
+	perfCores, err := syscall.SysctlUint32(query)
+	if err != nil {
+		slog.Warn("failed to discover physical CPU details", "query", query, "error", err)
+	}
+	query = "hw.perflevel1.physicalcpu"
+	efficiencyCores, _ := syscall.SysctlUint32(query) // On x86 xeon this wont return data
+
+	// Determine thread count
+	query = "hw.logicalcpu"
+	logicalCores, _ := syscall.SysctlUint32(query)
+
+	return SystemInfo{
+		System: CPUInfo{
+			GpuInfo: GpuInfo{
+				memInfo: mem,
+			},
+			CPUs: []CPU{
+				{
+					CoreCount:           int(perfCores + efficiencyCores),
+					EfficiencyCoreCount: int(efficiencyCores),
+					ThreadCount:         int(logicalCores),
+				},
+			},
+		},
+		GPUs: GetGPUInfo(),
+	}
+}