#!/usr/bin/env bash
# Kaisa：对 hda_link_dma_hw_params / snd_hdac_ext_bus_link_set_stream_id / sof_ipc3_pcm_hw_params
# 做 function_graph 追踪（需 root、CONFIG_FUNCTION_GRAPH、debugfs 已挂载）。
# 用法：sudo ./scripts/collect-hda-link-ftrace.sh [plughw:0,3]
# 产出：/tmp/hda_link_ftrace_<ts>.txt；请复制到 audio_topology/collected/
# 详见 patches/ubuntu-hwe-6.17/STREAM_PCM_PARAMS_CHROME_UBUNTU_NOTES.md §6.1
set -euo pipefail

if [[ "${EUID:-}" -ne 0 ]]; then
  echo "请使用 sudo 运行。" >&2
  exit 1
fi

PLUG="${1:-plughw:0,3}"
TRACING="${TRACING:-/sys/kernel/tracing}"
if [[ ! -d "$TRACING" ]]; then
  TRACING="/sys/kernel/debug/tracing"
fi
if [[ ! -d "$TRACING" ]]; then
  echo "未找到 tracing（$TRACING）。请确认 CONFIG_FTRACE。" >&2
  exit 1
fi

TS=$(date +%Y%m%d_%H%M%S)
KR=$(uname -r)
OUT="/tmp/hda_link_ftrace_${KR}_${TS}.txt"

echo "tracing dir: $TRACING"
echo 0 > "$TRACING/tracing_on" 2>/dev/null || true
echo function_graph > "$TRACING/current_tracer"
echo 'hda_link_dma_hw_params' > "$TRACING/set_ftrace_filter"
echo 'snd_hdac_ext_bus_link_set_stream_id' >> "$TRACING/set_ftrace_filter"
echo 'sof_ipc3_pcm_hw_params' >> "$TRACING/set_ftrace_filter"
echo 1 > "$TRACING/options/funcgraph-proc" 2>/dev/null || true
: > "$TRACING/trace"

echo 1 > "$TRACING/tracing_on"
echo "播放: speaker-test -D $PLUG -c 2 -t wav -l 1 (约 8s)"
timeout 10 speaker-test -D "$PLUG" -c 2 -t wav -l 1 >/dev/null 2>&1 || true
echo 0 > "$TRACING/tracing_on"

{
  echo "### uname -r: $KR"
  echo "### plughw: $PLUG"
  echo "### ftrace filter:"
  cat "$TRACING/set_ftrace_filter" 2>/dev/null || true
  echo "### trace:"
  cat "$TRACING/trace"
} > "$OUT"

echo "已写入: $OUT ($(wc -l < "$OUT") 行)"
echo "复制到仓库: cp $OUT /path/to/chromebox_10th_audio_driver/audio_topology/collected/"