#!/bin/bash
# pin_client_sems.sh - bridge the CUDA client's device mappings into the
# emulation for the live cdt process.
#
# Two things are pinned, both per-process (a new cdt maps new physical pages
# at the same VAs, so re-run this for every cdt run):
#   1. the /dev/nvidia0 window: the driver's channel rings/USERDs (the GR
#      channels' GPFIFO VAs live here), so the pump can run their pushes;
#   2. the semaphore pages libcuda's trackers poll (found by scanning the
#      client's memory for sem references, then translated through the guest
#      pagemap).
#
# Usage: tools/guest-diag/pin_client_sems.sh [iterations] [sleep-secs]
set -u
cd "$(dirname "$(readlink -f "$0")")/../.."
VMEXEC=./scripts/vgpu_vm.py
ITER=${1:-1}
SLEEP=${2:-10}

PID=$(timeout 20 $VMEXEC exec --timeout 15 'pgrep -x cdt | head -1' 2>/dev/null | tail -1)
[ -n "$PID" ] || { echo "no cdt pid"; exit 1; }
echo "cdt pid=$PID"

B64=$(gzip -9 < tools/guest-diag/sempages.py | base64 -w0)
timeout 30 $VMEXEC exec --timeout 25 "echo '$B64' | base64 -d | gunzip > /tmp/sempages.py" >/dev/null 2>&1
B64=$(gzip -9 < tools/guest-diag/memprobe.py | base64 -w0)
timeout 30 $VMEXEC exec --timeout 25 "echo '$B64' | base64 -d | gunzip > /tmp/memprobe.py" >/dev/null 2>&1
B64=$(base64 -w0 tools/guest-diag/guest_pmap_all.py)
timeout 30 $VMEXEC exec --timeout 25 "echo '$B64' | base64 -d > /tmp/pmapall.py" >/dev/null 2>&1

pin_range() {   # pin_range <lo-dec> <hi-dec> <label>
    local cur=$1 hi=$2 label=$3 total=0
    while [ "$cur" -lt "$hi" ]; do
        mapfile -t lines < <(timeout 60 $VMEXEC exec --timeout 50 "sudo python3 /tmp/pmapall.py $PID $(printf '0x%x' "$cur") 32" 2>/dev/null | grep -aE '^0x[0-9a-f]+,0x[0-9a-f]+$')
        [ "${#lines[@]}" -gt 0 ] || break
        for l in "${lines[@]}"; do
            echo "$l,0x1000,1" | sudo tee /sys/module/vgsp/parameters/sema_map_add >/dev/null
        done
        total=$((total + ${#lines[@]}))
        local last=${lines[-1]%%,*}
        cur=$(( 16#${last#0x} + 0x1000 ))
    done
    echo "  $label: pinned $total page(s)"
}

for it in $(seq 1 "$ITER"); do
    # 1. /dev/nvidia0 windows (channel rings/USERDs).
    mapfile -t n0 < <(timeout 30 $VMEXEC exec --timeout 25 "awk '/\\/dev\\/nvidia0/ {print \$1}' /proc/$PID/maps" 2>/dev/null | grep -E '^[0-9a-f]+-[0-9a-f]+$')
    for r in "${n0[@]}"; do
        lo=$(( 16#${r%-*} ))
        hi=$(( 16#${r#*-} ))
        pin_range "$lo" "$hi" "nvidia0 $r"
    done

    # 2. client semaphore pages.
    lines=$(timeout 150 $VMEXEC exec --timeout 140 "sudo timeout 120 python3 /tmp/sempages.py $PID" 2>/dev/null | grep -E '^0x[0-9a-f]+$')
    n=0
    for va in $lines; do
        line=$(timeout 30 $VMEXEC exec --timeout 25 "sudo python3 /tmp/pmapall.py $PID $va 1" 2>/dev/null | grep -E '^0x[0-9a-f]+,0x[0-9a-f]+$' | head -1)
        [ -n "$line" ] || continue
        echo "$line,0x1000,1" | sudo tee /sys/module/vgsp/parameters/sema_map_add >/dev/null || continue
        n=$((n + 1))
    done
    echo "iter $it: pinned $n sem page(s) (pid $PID)"
    [ "$it" -lt "$ITER" ] && sleep "$SLEEP"
done