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#!/usr/bin/env python3
# reg_sampler.py - read-only BAR0 register sampler for GR/FECS/SKED ground truth.
#
# Purpose
# Sample the physical GPU's PGRAPH/FECS/SKED/PFIFO registers at high rate
# while a GR launch is in flight, so the engine-side state transitions
# (context load, CWD table occupancy, SKED activity, GRFIFO progress) are
# observable without the driver's help. Used to capture the ground-truth
# behaviour of a working CUDA channel (distro driver) and to inspect the
# ladder's forwarded launches.
#
# Safety
# Read-only MMIO. Safe to run while any driver owns the device. Needs root
# (resource0 mmap). Do not run concurrently with a driver rebind/FLR.
#
# Usage
# sudo python3 reg_sampler.py <seconds> <Hz> <outfile> [label]
# python3 analyze_regs.py <outfile> # value distribution + transitions
#
# Notes
# - The sampler writes one TSV line per sample: t and one u32 per register.
# - `badfxxxx` values are the GPU returning its "bad fence/clock-gated"
# pattern during driver handoff windows; filter them in analysis.
# - Offset source: kernel/gsp_phys_booter.c reg-probe table (TU104).
import mmap
import os
import struct
import sys
import time
DEV = "/sys/bus/pci/devices/0000:01:00.0/resource0"
REGS = [
(0x000200, "PMC_ENABLE"),
(0x400700, "PGRAPH_STATUS"),
(0x400504, "GRFIFO_STATUS"),
(0x400704, "TRAPPED_ADDR"),
(0x400708, "TRAPPED_DATA_LO"),
(0x404000, "FE_HWW_ESR"),
(0x407020, "SKED_HWW_ESR"),
(0x407024, "SKED_HWW_ESR_EN"),
(0x407028, "SKED_HWW_INFO_1"),
(0x40702C, "SKED_HWW_INFO_2"),
(0x407030, "SKED_HWW_INFO_3"),
(0x407040, "SKED_STATUS_0"),
(0x407054, "SKED_ACTIVITY"),
(0x407060, "CWD_TABLE_0"),
(0x407064, "CWD_TABLE_1"),
(0x407068, "CWD_TABLE_2"),
(0x40706C, "CWD_TABLE_3"),
(0x407070, "SKED_CACHE_0"),
(0x407074, "SKED_CACHE_1"),
(0x407090, "SKED_L15_CACHE_0"),
(0x407080, "TASKTABLE_0"),
(0x407084, "TASKTABLE_1"),
(0x407088, "TASKTABLE_2"),
(0x409008, "FECS_IRQSTAT"),
(0x409100, "FECS_CPUCTL"),
(0x409400, "FECS_CTXSW_STATUS_1"),
(0x409b00, "FECS_CURRENT_CTX"),
(0x409b04, "FECS_NEW_CTX"),
(0x409c00, "FECS_CTXSW_STATUS_FE_0"),
(0x409c18, "FECS_HOST_INT_STATUS"),
(0x409040, "FECS_MAILBOX0"),
(0x409044, "FECS_MAILBOX1"),
(0x40a300, "FE_QMD_VIRT_BASEA_0"),
(0x40a304, "FE_QMD_VIRT_BASEA_1"),
(0x40a400, "FE_QMD_VIRT_BASEB_0"),
(0x40a500, "FE_QMD_VIRT_CONTROL_0"),
(0x40a504, "FE_QMD_VIRT_CONTROL_1"),
(0x40a508, "FE_QMD_VIRT_CONTROL_2"),
(0x40a50c, "FE_QMD_VIRT_CONTROL_3"),
(0x41a040, "GPCCS_MAILBOX0"),
(0x41a100, "GPCCS_CPUCTL"),
]
def main():
secs = float(sys.argv[1])
hz = float(sys.argv[2])
out = sys.argv[3]
label = sys.argv[4] if len(sys.argv) > 4 else "sample"
fd = os.open(DEV, os.O_RDONLY | os.O_SYNC)
m = mmap.mmap(fd, 0x1000000, mmap.MAP_SHARED, mmap.PROT_READ)
period = 1.0 / hz
t0 = time.monotonic()
n = 0
with open(out, "w") as f:
f.write("# %s t=%.3f\n" % (label, t0))
f.write("# ts " + " ".join(nm for _, nm in REGS) + "\n")
while time.monotonic() - t0 < secs:
ts = time.monotonic() - t0
vals = [struct.unpack_from("<I", m, off)[0] for off, _ in REGS]
f.write("%.6f " % ts + " ".join("%08x" % v for v in vals) + "\n")
n += 1
dt = period - (time.monotonic() - t0 - ts)
if dt > 0:
time.sleep(dt)
print("samples=%d" % n)
if __name__ == "__main__":
main()
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