Bypass extra discovery on jetpack systems

On at least Jetpack6, cuda_v12 appears to expose the iGPU, but crashes later on in
cublasInit so if we detect a Jetpack, short-circuit and use that variant.

discover/gpu.go

@@ -6,7 +6,9 @@ import (
 	"log/slog"
 	"os"
 	"path/filepath"
+	"regexp"
 	"runtime"
+	"strconv"
 	"strings"
 
 	"github.com/ollama/ollama/format"
@@ -146,3 +148,35 @@ func GetSystemInfo() SystemInfo {
 		GPUs: gpus,
 	}
 }
+
+func cudaJetpack() string {
+	if runtime.GOARCH == "arm64" && runtime.GOOS == "linux" {
+		if CudaTegra != "" {
+			ver := strings.Split(CudaTegra, ".")
+			if len(ver) > 0 {
+				return "jetpack" + ver[0]
+			}
+		} else if data, err := os.ReadFile("/etc/nv_tegra_release"); err == nil {
+			r := regexp.MustCompile(` R(\d+) `)
+			m := r.FindSubmatch(data)
+			if len(m) != 2 {
+				slog.Info("Unexpected format for /etc/nv_tegra_release.  Set JETSON_JETPACK to select version")
+			} else {
+				if l4t, err := strconv.Atoi(string(m[1])); err == nil {
+					// Note: mapping from L4t -> JP is inconsistent (can't just subtract 30)
+					// https://developer.nvidia.com/embedded/jetpack-archive
+					switch l4t {
+					case 35:
+						return "jetpack5"
+					case 36:
+						return "jetpack6"
+					default:
+						// Newer Jetson systems use the SBSU runtime
+						slog.Debug("unrecognized L4T version", "nv_tegra_release", string(data))
+					}
+				}
+			}
+		}
+	}
+	return ""
+}

discover/runner.go

@@ -79,6 +79,7 @@ func GPUDevices(ctx context.Context, runners []FilteredRunnerDiscovery) []ml.Dev
 
 		slog.Info("discovering available GPUs...")
 		requested := envconfig.LLMLibrary()
+		jetpack := cudaJetpack()
 
 		// For our initial discovery pass, we gather all the known GPUs through
 		// all the libraries that were detected. This pass may include GPUs that
@@ -87,9 +88,13 @@ func GPUDevices(ctx context.Context, runners []FilteredRunnerDiscovery) []ml.Dev
 		// times concurrently leading to memory contention
 		for dir := range libDirs {
 			var dirs []string
-			if requested != "" && dir != "" && filepath.Base(dir) != requested {
-				slog.Debug("skipping available library at users request", "requested", requested, "libDir", dir)
-				continue
+			if dir != "" {
+				if requested != "" && filepath.Base(dir) != requested {
+					slog.Debug("skipping available library at users request", "requested", requested, "libDir", dir)
+					continue
+				} else if jetpack != "" && filepath.Base(dir) != "cuda_"+jetpack {
+					continue
+				}
 			}
 			if dir == "" {
 				dirs = []string{LibOllamaPath}