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#!/usr/bin/env python3
# fasttick.py - watch the service log for the GR0 channel's ring resolution
# (sema-chan: h=0xbeec0100 ... ring rc=0 pa=0x...) and immediately hand the
# verified {ring VA -> ring PA} pair to the service (sema_pdb_discover), so
# the parked VAS pdb candidate can be verified before/at age-out.
import re, subprocess, sys, time
PARAM = "/sys/module/vgsp/parameters/sema_pdb_discover"
RING_VA = 0x4cc0000
def main():
dur = float(sys.argv[1]) if len(sys.argv) > 1 else 120
end = time.time() + dur
fired = set()
seen_pdbs = set()
print("# fasttick start (%.0fs)" % dur, flush=True)
while time.time() < end:
out = subprocess.run(["sudo", "dmesg"], capture_output=True).stdout.decode(errors="ignore")
tail = out.splitlines()[-120:]
for ln in tail:
m = re.search(r"sema-chan: h=0xbeec0100 eng=\d+ cid=\d+ gpfifo=0x([0-9a-f]+) ent=\d+ userd=0x[0-9a-f]+ as=\d+ put=\d+ get=\d+ ring rc=0 pa=0x([0-9a-f]+)", ln)
if m:
ring_va = int(m.group(1), 16)
ring_pa = int(m.group(2), 16)
key = (ring_va, ring_pa)
if key not in fired:
fired.add(key)
cmd = "echo 0x%x,0x%x > %s" % (ring_va, ring_pa, PARAM)
r = subprocess.run(["sudo", "sh", "-c", cmd], capture_output=True)
print("[%s] TRIGGER va=0x%x pa=0x%x rc=%d" % (
time.strftime("%H:%M:%S"), ring_va, ring_pa, r.returncode), flush=True)
m2 = re.search(r"page directory (?:registered UNVERIFIED after \d+ ms parked \()?pdb=0x([0-9a-f]+) entries=(\d+)", ln)
if not m2:
m2 = re.search(r"VA space 0x[0-9a-f]+ page directory 0x([0-9a-f]+) entries=(\d+)", ln)
if m2:
key = int(m2.group(1), 16)
if key not in seen_pdbs:
seen_pdbs.add(key)
print("[%s] PDB candidate 0x%x entries=%s" % (
time.strftime("%H:%M:%S"), key, m2.group(2)), flush=True)
time.sleep(0.3)
print("# fasttick end", flush=True)
main()
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