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#!/bin/bash
# load_vgpu_stack.sh - Load complete vGPU driver stack
# Usage: ./load_vgpu_stack.sh [firmware_name]

set -euo pipefail

FIRMWARE_NAME="${1:-gsp-570.144.fwimage.bin}"

BASE_DIR="$OPEN_IOV_ROOT"
NVIDIA_KO="$BASE_DIR/nvidia-open-gpu-kernel-modules/kernel-open/nvidia.ko"
VFIO_KO="$BASE_DIR/kernel/open-iov-vfio.ko"
GSP_VGPU_KO="$BASE_DIR/driver/gsp-vgpu.ko"
FIRMWARE_PATH="$BASE_DIR/firmware/570-GSP/$FIRMWARE_NAME"

echo "=========================================="
echo "Loading vGPU Driver Stack"
echo "=========================================="
echo "Firmware: $FIRMWARE_NAME"
echo ""

# Check files exist
for f in "$NVIDIA_KO" "$VFIO_KO" "$GSP_VGPU_KO" "$FIRMWARE_PATH"; do
    if [[ ! -f "$f" ]]; then
        echo "ERROR: Missing file: $f"
        exit 1
    fi
done

# Check if already loaded
if lsmod | grep -q "^nvidia "; then
    echo "nvidia.ko already loaded"
else
    echo "Loading nvidia.ko (OpenRM)..."
    sudo insmod "$NVIDIA_KO"
    echo "  OK"
fi

if lsmod | grep -q "^open_iov_vfio "; then
    echo "open-iov-vfio.ko already loaded"
else
    echo "Loading open-iov-vfio.ko..."
    sudo insmod "$VFIO_KO"
    echo "  OK"
fi

if lsmod | grep -q "^gsp_vgpu "; then
    echo "gsp-vgpu.ko already loaded"
else
    echo "Loading gsp-vgpu.ko with firmware=$FIRMWARE_NAME..."
    sudo insmod "$GSP_VGPU_KO" firmware_name="$FIRMWARE_NAME"
    echo "  OK"
fi

echo ""
echo "=========================================="
echo "Driver Stack Loaded Successfully"
echo "=========================================="
lsmod | grep -E "nvidia|open_iov|gsp_vgpu"
echo ""
echo "Device nodes:"
ls -la /dev/gsp-vgpu* /dev/nvidia* 2>/dev/null || echo "  (none yet - create mdev first)"
echo ""
echo "Next steps:"
echo "  1. Create mdev: $BASE_DIR/scripts/create_mdev.sh"
echo "  2. Launch QEMU: $BASE_DIR/scripts/launch_qemu_vgpu.sh"