From 154acff203153d750eb5a381be9183d4e141bf7f Mon Sep 17 00:00:00 2001
From: Arthur Hanson Rasmusson <arthur@vgpu.io>
Date: Sun, 25 Oct 2026 08:19:37 -0400
Subject: wall-2 session-78: post-device wait identified as the NvOgl (GL
 ucode) engine init (A8 retry loop work item named NvOgl_m0; D6 submit ORs
 0x200000 into the pending word) and the push windows become READABLE via the
 resolver6 window-record/memdesc recipe (0x4480000 -> 0x120cfb000, 0x4ca0000
 -> 0x12e51e000; the service decodes the GR init streams where sessions 73-74
 saw unread) - remaining gate: have_rel=0 (CE-shaped matcher) and the GR
 forward not engaging (forwarded=0 gr_nocap=4 drain held=4)

---
 tools/guest-diag/wall2/README-session77.md | 30 ++++++++++
 tools/guest-diag/wall2/wall2_resolver6.py  | 93 ++++++++++++++++++++++++++++++
 2 files changed, 123 insertions(+)
 create mode 100644 tools/guest-diag/wall2/wall2_resolver6.py

(limited to 'tools/guest-diag')

diff --git a/tools/guest-diag/wall2/README-session77.md b/tools/guest-diag/wall2/README-session77.md
index cf2450e..282b3a0 100644
--- a/tools/guest-diag/wall2/README-session77.md
+++ b/tools/guest-diag/wall2/README-session77.md
@@ -73,3 +73,33 @@
   nvidiactl mapping (pagemap; run in the guest as root).
 * `nudge.sh` — host-side loop: poll guest_words.sh and write 1 to any
   zero word (multi-page variant; prefer the single-word recipe).
+
+## ADDENDUM (r685, session 78) — POST-DEVICE WAIT IDENTIFIED: the NvOgl (GL ucode) engine init; push windows now READABLE (resolver6)
+
+* The post-device spin is the **GL module bring-up**: the main thread's
+  A8-layer retry loop (eglcore 0xa85d24) works on a work item whose
+  embedded name is ASCII **"NvOgl_m0"** (+0xf04: "NvOgl_m40"); the D6
+  submit layer (0xd624e0) ORs **0x200000** into its pending word (the
+  same engine-pending bit SESSION 75/76 watched on E+0x150), then the
+  A8 loop yields via the B284B0 spin helper (sched_yield) waiting for
+  the GL ucode init to complete on the GR engine.
+* **The push windows ARE now readable** (first time): the resolver6
+  recipe (window-record pair {push_va,0x20000}+{ring_va,0x40000} ->
+  same-page 0x20000 memdesc PA -> `sema_map_add`) injected
+  `0x4480000 -> 0x120cfb000` (content `2001c00d 70000000 2001c00d
+  68000000` = the 2-method semaphore-like push) and `0x4ca0000 ->
+  0x12e51e000` (the 1432-byte GR init stream: SET_OBJECT 0xc5c0/0xc5b5,
+  `0x200121ed`, `0x200120a9`, bulk methods, tail `2001c00d
+  70/68`). The service now decodes the streams (`sema-push ... tail=0dc0
+  012000000070...`) where SESSION 73-74 saw "unread".
+  CAUTION: the resolver injects every candidate; a zero-page candidate
+  injected last replaces the good mapping for that VA (re-inject the
+  good page after the scan).
+* **Remaining gate**: the service still reports `have_rel=0` for every
+  GR push (the CE-shaped release matcher) and — decisively — the
+  GR-forward machinery is NOT engaging: `drain held=4 starved=149
+  forwarded=0 ... gr_nocap=4`. The GL ucode init work is never
+  forwarded/executed, so the completion (and the 0x200000 bit clear)
+  never arrives. Next: the GR forward/capture path for these channels
+  (operand capture + release decode for the GR shape), then the client
+  proceeds to VKFRAME.
diff --git a/tools/guest-diag/wall2/wall2_resolver6.py b/tools/guest-diag/wall2/wall2_resolver6.py
new file mode 100644
index 0000000..4653efa
--- /dev/null
+++ b/tools/guest-diag/wall2/wall2_resolver6.py
@@ -0,0 +1,93 @@
+#!/usr/bin/env python3
+# wall2_resolver6.py - resolver5 logic for BOTH current push windows:
+#   pair A: push 0x4480000 (0x20000) + ring 0x44a0000 (0x40000)
+#   pair B: push 0x4ca0000 (0x20000) + ring 0x4cc0000 (0x40000)
+# Scans guest RAM continuously; injects PUSH_VA -> every 0x20000 memdesc PA
+# found in a page holding both window records.
+import subprocess, struct, time, sys, os
+
+RAM = "/dev/shm/vgpu-guest-ram"
+PARAM = "/sys/module/vgsp/parameters/sema_map_add"
+LOG = "/tmp/opencode/wall2_resolver6.log"
+WATCH_S = int(os.environ.get("W2_WATCH", "420"))
+PAIRS = [(0x4480000, 0x44a0000), (0x4ca0000, 0x4cc0000)]
+
+logf = open(LOG, "a", buffering=1)
+def log(*a):
+    s = " ".join(str(x) for x in a)
+    print(s, flush=True)
+    logf.write("[%s] %s\n" % (time.strftime("%H:%M:%S"), s))
+
+img = open(RAM, "rb", buffering=0)
+def off2gpa(off):
+    return off if off < 0x80000000 else 0x100000000 + (off - 0x80000000)
+def gpa2off(pa):
+    if pa < 0x80000000: return pa
+    if pa < 0x180000000: return 0x80000000 + (pa - 0x100000000)
+    return None
+def rd(pa, n):
+    off = gpa2off(pa)
+    if off is None: return None
+    img.seek(off); return img.read(n)
+
+def inject(va, pa, ln=0x1000, ap=1):
+    cmd = "echo 0x%x,0x%x,0x%x,%d > %s" % (va, pa, ln, ap, PARAM)
+    r = subprocess.run(["sudo", "sh", "-c", cmd], capture_output=True, text=True)
+    if r.returncode == 0:
+        log("INJECT va=0x%x -> pa=0x%x" % (va, pa))
+        return True
+    log("inject FAIL rc=%d %s" % (r.returncode, r.stderr.strip()))
+    return False
+
+def find_qpair(a, b):
+    img.seek(0, 2); fsz = img.tell()
+    pat = struct.pack("<QQ", a, b)
+    out = []
+    CH = 64 << 20
+    pos = 0
+    while pos < fsz:
+        img.seek(pos); d = img.read(min(CH, fsz - pos))
+        st = 0
+        while True:
+            i = d.find(pat, st)
+            if i < 0: break
+            st = i + 1
+            out.append(off2gpa(pos + i) & ~0xfff)
+        pos += CH
+    return out
+
+def main():
+    log("=== resolver6 start (watch=%ds) ===" % WATCH_S)
+    injected = set()
+    deadline = time.time() + WATCH_S
+    while time.time() < deadline:
+        for (pva, rva) in PAIRS:
+            try:
+                pages = set(find_qpair(pva, 0x20000)) & set(find_qpair(rva, 0x40000))
+            except Exception as e:
+                log("scan error:", e); continue
+            for page in sorted(pages):
+                d = rd(page, 0x1000)
+                if not d: continue
+                cands = []
+                for o in range(0, 0x1000 - 24, 8):
+                    sz, fl = struct.unpack_from("<QQ", d, o)
+                    if sz == 0x20000 and fl == 0x03008000:
+                        pa = struct.unpack_from("<Q", d, o + 16)[0]
+                        if 0x100000000 <= pa < 0x180000000:
+                            cands.append((o, pa))
+                for (o, pa) in cands:
+                    key = (pva, page, o)
+                    if key in injected: continue
+                    pd = rd(pa, 0x40)
+                    nz = sum(1 for b in pd if b) if pd else -1
+                    log("pair=0x%x page=0x%x desc@0x%x pa=0x%x live_nz=%d head=%s"
+                        % (pva, page, o, pa, nz, pd.hex()[:64] if pd else "?"))
+                    if inject(pva, pa):
+                        injected.add(key)
+        time.sleep(1)
+    log("=== resolver6 done: %d injection(s) ===" % len(injected))
+    return 0
+
+if __name__ == "__main__":
+    sys.exit(main())
-- 
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