diff options
Diffstat (limited to 'tools/guest-diag/semfix_watch.py')
| -rw-r--r-- | tools/guest-diag/semfix_watch.py | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/tools/guest-diag/semfix_watch.py b/tools/guest-diag/semfix_watch.py index 347da5e..1fc6b01 100644 --- a/tools/guest-diag/semfix_watch.py +++ b/tools/guest-diag/semfix_watch.py @@ -343,6 +343,33 @@ def pin_bulk(va, pa, nbytes): return False +def sem_state(q, sem): + """(index, queued, payload) for a tracking-semaphore kptr, or None. + + payload is the u32 the client's update_completed_value reads: the pool + page at the semaphore's index, through the CPU mapping the struct names. + Printed when it changes so the last stall before a failure is visible. + """ + vals = q.read64(sem, 11) + if len(vals) < 2 or not is_kern(vals[0]): + return None + page = vals[0] + pv = q.read64(page) + if not pv or not is_kern(pv[0]): + return None + mem = pv[0] + vas = q.read64(mem + 0x10, 16) + cpu = next((v for v in vas if is_kern(v)), None) + idx = vals[1] & 0xffff + w10 = vals[2] if len(vals) > 2 else 0 + queued = vals[5] if len(vals) > 5 else 0 + payload = None + if cpu: + w = q.read64(cpu + idx * 4) + payload = w[0] if w else None + return (idx, w10, queued, payload) + + def resolve_sem_pool(q, sem): page = q.read64(sem) if not page or not page[0]: @@ -408,6 +435,7 @@ def main(): seen_pb = set() seen_ch = set() pinned_ranges = set() + sem_last = {} def pin_range_once(gpu_vas, cpu, gpa, size=0): key = tuple(gpu_vas), cpu, size @@ -419,6 +447,18 @@ def main(): print("semfix: watching (interval %.1fs)" % interval, flush=True) while True: sems, pbs, chans = guest_trace() + for sem in sems: + try: + st = sem_state(q, sem) + except Exception: + st = None + if st != sem_last.get(sem): + sem_last[sem] = st + if st: + print("semfix: sem=0x%x idx=%d +10=0x%x +28=0x%x payload=%s" + % (sem, st[0], st[1], st[2], + "0x%x" % st[3] if st[3] is not None else "?"), + flush=True) for ch in chans - seen_ch: d = {} try: |