From 4c57431c2da92a524f1dc680b0b7360050211b2d Mon Sep 17 00:00:00 2001
From: Filious Louis <1417132+fjlouis@users.noreply.github.com>
Date: Tue, 28 Jul 2026 20:53:59 -0500
Subject: [PATCH] Resolve Intel NPU device dynamically

---
 frigate/test/test_gpu_stats.py | 74 ++++++++++++++++++++++++++++------
 frigate/util/services.py       | 25 ++++++------
 2 files changed, 74 insertions(+), 25 deletions(-)

diff --git a/frigate/test/test_gpu_stats.py b/frigate/test/test_gpu_stats.py
index 160756860e..f6cf196880 100644
--- a/frigate/test/test_gpu_stats.py
+++ b/frigate/test/test_gpu_stats.py
@@ -24,35 +24,85 @@ class TestGpuStats(unittest.TestCase):
 
     @patch("frigate.util.services.time.sleep")
     @patch("frigate.util.services.time.time", side_effect=[0.0, 1.0])
+    @patch(
+        "frigate.util.services.os.readlink",
+        return_value="/sys/bus/pci/drivers/intel_vpu",
+    )
+    @patch(
+        "frigate.util.services.glob.glob",
+        return_value=["/sys/class/accel/accel0"],
+    )
     @patch(
         "builtins.open",
         side_effect=[StringIO("1000"), StringIO("1250")],
     )
-    def test_openvino_npu_stats_runtime_active_time(self, open_file, time, sleep):
+    def test_openvino_npu_stats_discovers_accel0(
+        self, open_file, glob, readlink, time, sleep
+    ):
         assert get_openvino_npu_stats() == {"npu": "25.0", "mem": "-%"}
 
-        assert open_file.call_args_list[0].args[0].endswith("runtime_active_time")
+        open_file.assert_any_call(
+            "/sys/class/accel/accel0/device/power/runtime_active_time"
+        )
 
     @patch("frigate.util.services.time.sleep")
     @patch("frigate.util.services.time.time", side_effect=[0.0, 1.0])
     @patch(
-        "builtins.open",
+        "frigate.util.services.os.readlink",
         side_effect=[
-            FileNotFoundError,
-            StringIO("1000000"),
-            StringIO("1250000"),
+            "/sys/bus/pci/drivers/other",
+            "/sys/bus/pci/drivers/intel_vpu",
         ],
     )
-    def test_openvino_npu_stats_busy_time_fallback(self, open_file, time, sleep):
+    @patch(
+        "frigate.util.services.glob.glob",
+        return_value=[
+            "/sys/class/accel/accel0",
+            "/sys/class/accel/accel1",
+        ],
+    )
+    @patch(
+        "builtins.open",
+        side_effect=[StringIO("1000"), StringIO("1250")],
+    )
+    def test_openvino_npu_stats_skips_non_intel_accelerator(
+        self, open_file, glob, readlink, time, sleep
+    ):
         assert get_openvino_npu_stats() == {"npu": "25.0", "mem": "-%"}
 
-        assert open_file.call_args_list[0].args[0].endswith("runtime_active_time")
-        assert open_file.call_args_list[1].args[0].endswith("npu_busy_time_us")
+        open_file.assert_any_call(
+            "/sys/class/accel/accel1/device/power/runtime_active_time"
+        )
 
-    @patch("builtins.open", side_effect=FileNotFoundError)
-    def test_openvino_npu_stats_unavailable(self, open_file):
+    @patch(
+        "frigate.util.services.os.readlink",
+        return_value="/sys/bus/pci/drivers/other",
+    )
+    @patch(
+        "frigate.util.services.glob.glob",
+        return_value=["/sys/class/accel/accel0"],
+    )
+    @patch("builtins.open")
+    def test_openvino_npu_stats_no_intel_accelerator(self, open_file, glob, readlink):
         assert get_openvino_npu_stats() is None
-        assert open_file.call_count == 2
+        open_file.assert_not_called()
+
+    @patch(
+        "frigate.util.services.os.readlink",
+        return_value="/sys/bus/pci/drivers/intel_vpu",
+    )
+    @patch(
+        "frigate.util.services.glob.glob",
+        return_value=["/sys/class/accel/accel0"],
+    )
+    @patch("builtins.open", side_effect=FileNotFoundError)
+    def test_openvino_npu_stats_runtime_counter_unavailable(
+        self, open_file, glob, readlink
+    ):
+        assert get_openvino_npu_stats() is None
+        open_file.assert_called_once_with(
+            "/sys/class/accel/accel0/device/power/runtime_active_time"
+        )
 
     @patch("frigate.stats.intel_gpu_info.intel_gpu_name_resolver.get_names")
     @patch("frigate.util.services.time.sleep")
diff --git a/frigate/util/services.py b/frigate/util/services.py
index f367235b28..395d30c801 100644
--- a/frigate/util/services.py
+++ b/frigate/util/services.py
@@ -1,6 +1,7 @@
 """Utilities for services."""
 
 import asyncio
+import glob
 import json
 import logging
 import os
@@ -670,19 +671,17 @@ def get_intel_gpu_stats(
 
 def get_openvino_npu_stats() -> dict[str, str] | None:
     """Get NPU stats using openvino."""
-    NPU_RUNTIME_PATHS = (
-        (
-            "/sys/devices/pci0000:00/0000:00:0b.0/power/runtime_active_time",
-            1_000,  # Milliseconds per second
-        ),
-        (
-            "/sys/class/accel/accel0/device/npu_busy_time_us",
-            1_000_000,  # Microseconds per second
-        ),
-    )
-
-    for runtime_path, units_per_second in NPU_RUNTIME_PATHS:
+    for accel_path in sorted(glob.glob("/sys/class/accel/accel*")):
         try:
+            driver = os.path.basename(os.readlink(f"{accel_path}/device/driver"))
+        except OSError:
+            continue
+
+        if driver != "intel_vpu":
+            continue
+
+        try:
+            runtime_path = f"{accel_path}/device/power/runtime_active_time"
             with open(runtime_path) as f:
                 initial_runtime = float(f.read().strip())
             break
@@ -705,7 +704,7 @@ def get_openvino_npu_stats() -> dict[str, str] | None:
 
         # Calculate usage percentage
         runtime_diff = current_runtime - initial_runtime
-        time_diff = (current_time - initial_time) * units_per_second
+        time_diff = (current_time - initial_time) * 1000.0  # Convert to milliseconds
 
         if time_diff > 0:
             usage = min(100.0, max(0.0, (runtime_diff / time_diff * 100.0)))