gpu_usage: Initial import of script to read gpu usage debugfs info

scripts/gpu_usage.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+import time
+import operator
+
+def get_stats():
+  try:
+    with open('/sys/kernel/debug/dri/0/gpu_usage') as f:
+      lines = f.readlines()
+  except:
+    print("gpu_uage is not supported on this device")
+    exit(1)
+  queue = {}
+  for i in lines:
+    s = i.replace("'", "").replace('"', "").strip().rstrip(';').split(';')
+    queues = ["bin", "render", "tfu", "csd", "cache_clean"]
+    if s[0] == 'timestamp':
+        timestamp = int(s[1])
+    elif s[0] == 'QUEUE':
+        names = s[1:]
+    elif s[0].replace("v3d_", "") in queues:
+        queue[s[0]] = list(map(int, s[1:]))
+    else:
+        print(s)
+        assert(False)
+  return timestamp, names, queue
+
+last_timestamp = None
+
+while True:
+  timestamp, names, queue = get_stats()
+  if last_timestamp is not None:
+    q = {}
+    t = timestamp - last_timestamp
+    for k,v in queue.items():
+      q[k] = list(map(operator.sub, queue[k], last_queue[k]))
+    s = []
+    for k,v in q.items():
+      s.append(f"{k}: jobs:{v[0]:3}{100.0*v[1]/t:6.1f}%")
+    print(", ".join(s))
+  last_timestamp = timestamp
+  last_queue = queue
+  time.sleep(1)