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#!/usr/bin/env python3
"""READ-ONLY probe: VRAM size + PSP boot state on a Navi31 (RX 7900 XTX)
attached over a USB<->PCIe enclosure (ASM2464PD-class bridge).
Purpose: establish what a HEALTHY card reports, as a control.
This script ONLY READS registers. No writes, no flash access, no reset, no
power cycling. Safe to run on a working card.
Only requirement: `tinygrad` must be importable (a checkout on PYTHONPATH, or
an installed copy). It does NOT need to be run from the repo root.
python3 vram_probe.py
Two probes run in separate subprocesses, because the device can only be opened
by one process at a time.
"""
import subprocess, sys
# mmRCC_CONFIG_MEMSIZE: fixed RCC register, readable before IP discovery (that is
# exactly why tinygrad uses it). Hardware address, not firmware dependent.
MEMSIZE_DWORD = 0xde3 # dword index -> byte 0x378C
TSU_CMD = 0x582CC # = MP0 C2PMSG_115, the PSP TSU flash/update mailbox
# (byte offset in BAR5; Navi31/MP0-13.0.0 specific)
# --- probe 1: raw registers. Works even when tinygrad cannot open the card. ---
# open_gpu()/MMIO are inlined from tinygrad's extra/amdflash/common.py so this
# script depends only on tinygrad itself.
RAW = r'''
import struct
from tinygrad.runtime.support.usb import USB3
from tinygrad.runtime.support.system import USBPCIDevice
cands = []
for vid, pid in ((0x3801, 0x0001), (0xADD1, 0x0001)):
cands += list(USB3.list_devices(vid, pid))
print(" USB bridges found: %%d" %% len(cands))
if not cands:
raise SystemExit(" no bridge found - is the enclosure connected and powered?")
gpu = USBPCIDevice("AM", *cands[0])
bar5 = gpu.map_bar(5, fmt='B')
rd32 = lambda off: struct.unpack('<I', bytes(bar5[off:off+4]))[0]
ms = rd32(%d * 4)
print(" mmRCC_CONFIG_MEMSIZE = %%#x -> VRAM = %%d MB" %% (ms, ms))
print(" TSU mailbox (C2PMSG_115) = %%#010x (bit31 set = task ready)" %% rd32(%d))
print(" VRAM[0:16] = %%s" %% bytes(gpu.map_bar(0)[0:16]).hex())
print()
print(" >>> " + ("MEMSIZE READS 0 - memory controller reports no VRAM"
if ms == 0 else "MEMSIZE OK: %%d MB" %% ms))
''' % (MEMSIZE_DWORD, TSU_CMD)
# --- probe 2: the normal tinygrad path -------------------------------------
HIGH = r'''
from tinygrad import Device, Tensor
d = Device["AMD"]; adev = d.iface.dev_impl
print(" opened OK")
print(" vram_size = %#x (%d MB)" % (adev.vram_size, adev.vram_size >> 20))
print(" PSP version = %#x" % adev.reg("regMP0_SMN_C2PMSG_58").read())
hb = [adev.reg("regMP0_SMN_C2PMSG_81").read() for _ in range(3)]
print(" PSP heartbeat x3 = %s -> %s" % ([hex(x) for x in hb],
"ADVANCING (alive)" if len(set(hb)) > 1 else "FROZEN"))
print(" compute test:", (Tensor([2.0, 4.0]) * 3).numpy().tolist())
'''
def run(title, code):
print("\n=== %s ===" % title)
try:
p = subprocess.run([sys.executable, "-c", code], capture_output=True, text=True, timeout=300)
except subprocess.TimeoutExpired:
print(" FAILED: timed out"); return
if (out := (p.stdout or "").strip()): print(out)
if p.returncode != 0:
import re
# pick the last line that looks like "SomeError: message"
cand = [l.strip().lstrip("| ").strip() for l in (p.stderr or "").splitlines()
if re.search(r"^[|+\s]*\w[\w.]*(Error|Exception)\b.*:", l)]
print(" FAILED: %s" % (cand[-1] if cand else "see stderr for details"))
run("raw register read (works even if tinygrad can't open the card)", RAW)
run("tinygrad Device['AMD']", HIGH)
print("""
--------------------------------------------------------------------
Please report back all of:
* mmRCC_CONFIG_MEMSIZE value
* TSU mailbox (C2PMSG_115) value
* whether Device['AMD'] opened, and the vram_size it printed
--------------------------------------------------------------------""")
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