{
  "name": "nvbandwidth-acs-ab",
  "description": "Two-phase A/B for the MSI CG480-S6053 cross-socket GPU P2P hard-reboot. Phase 1 disables PCIe ACS redirect at runtime via setpci (P2P goes device-direct instead of up to the root complex) then runs nvbandwidth across all 6 GPUs — the run expected to SURVIVE. Phase 2 restores ACS to the BIOS default and repeats — the run expected to REPRODUCE the reboot. Safe phase runs first so its full blackbox reaches the USB stick before the risky phase can reset the machine.",
  "timeout_sec": 1800,
  "jobs": [
    {
      "name": "acs-disable",
      "type": "command",
      "cmd": ["bash", "-c", ": > /run/bee-acs-orig; for bdf in $(lspci -D | awk '{print $1}'); do setpci -s $bdf ECAP_ACS.w >/dev/null 2>&1 || continue; v=$(setpci -s $bdf ECAP_ACS+0x6.w 2>/dev/null) || continue; echo $bdf $v >> /run/bee-acs-orig; setpci -s $bdf ECAP_ACS+0x6.w=0000 >/dev/null 2>&1 || true; done; echo ACS disabled on $(wc -l < /run/bee-acs-orig) bridges; echo -n 'bridges still ReqRedir+: '; lspci -vvv 2>/dev/null | grep -c 'ReqRedir+' || true"]
    },
    {
      "name": "nvbandwidth-acs-off",
      "type": "command",
      "cmd": ["dcgmi", "diag", "-r", "nvbandwidth", "-i", "{{gpus}}"],
      "gpu_indices": [0, 1, 2, 3, 4, 5]
    },
    {
      "name": "acs-restore",
      "type": "command",
      "cmd": ["bash", "-c", "test -s /run/bee-acs-orig || { echo no saved ACS state; exit 0; }; while read -r bdf v; do setpci -s $bdf ECAP_ACS+0x6.w=$v >/dev/null 2>&1 || true; done < /run/bee-acs-orig; echo ACS restored on $(wc -l < /run/bee-acs-orig) bridges; echo -n 'bridges ReqRedir+ now: '; lspci -vvv 2>/dev/null | grep -c 'ReqRedir+' || true"]
    },
    {
      "name": "nvbandwidth-acs-on",
      "type": "command",
      "cmd": ["dcgmi", "diag", "-r", "nvbandwidth", "-i", "{{gpus}}"],
      "gpu_indices": [0, 1, 2, 3, 4, 5]
    }
  ]
}