tools r624: tracker_walk.py + pool_page.py - guest-side (kcore) walks for the first-wait class: read a UVM tracker's semaphore object and expected payload, and dump the semaphore-pool page's applied values; together with the host pool-wr/sema-sw logs they compare what the driver waits for against what the host wrote

1 files changed, 28 insertions, 0 deletions

diff --git a/tools/guest-diag/pool_page.py b/tools/guest-diag/pool_page.py
new file mode 100755
index 0000000..a9f7b15
--- /dev/null
+++ b/tools/guest-diag/pool_page.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+# pool_page.py <pa-hex> - dump the UVM semaphore-pool page's u32 slots via
+# /proc/kcore (guest root). The pool VA 0x121000000 maps to the PA the
+# scanner+host pinned; nonzero slots are the applied release values. Compare
+# against the tracker's expected payload (tracker_walk.py) and the driver's
+# uvsv wait value to find write-target divergence / starvation.
+import sys
+import struct
+
+pa = int(sys.argv[1], 16) if len(sys.argv) > 1 else 0x107fd8000
+sys.argv = ["pool_page"]
+sys.path.insert(0, "/tmp")
+import guest_pin_stream as g  # noqa: E402
+
+kc = g.Kcore()
+if not kc.load():
+    print("KCORE LOAD FAILED")
+    sys.exit(1)
+
+nz = []
+for off in range(0, 0x1000, 4):
+    d = kc.read(kc.page_offset_base + pa + off, 4)
+    v = struct.unpack("<I", d)[0] if d else 0
+    if v:
+        nz.append((off, v))
+print("pa=0x%x nonzero slots=%d" % (pa, len(nz)))
+for off, v in nz[:64]:
+    print("off=0x%x val=%u" % (off, v))