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usbgpu: USB_RESCAN_BUS envvar (#10177)

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nimlgen
2025-05-06 17:09:36 +03:00
committed by GitHub
parent 781fd8c1eb
commit 10f115fdb0
1 changed files with 5 additions and 3 deletions
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8
tinygrad/runtime/support/amd.py
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@@ -1,7 +1,7 @@
import functools, importlib, time
from collections import defaultdict
from dataclasses import dataclass
from tinygrad.helpers import getbits, round_up
from tinygrad.helpers import getbits, round_up, getenv
from tinygrad.runtime.autogen import pci
from tinygrad.runtime.support.usb import ASM24Controller
@@ -33,8 +33,10 @@ def import_module(name:str, version:tuple[int, ...], version_prefix:str=""):
raise ImportError(f"Failed to load autogen module for {name.upper()} {'.'.join(map(str, version))}")
def setup_pci_bars(usb:ASM24Controller, gpu_bus:int, mem_base:int, pref_mem_base:int) -> dict[int, tuple[int, int]]:
try: usb.pcie_cfg_req(pci.PCI_VENDOR_ID, bus=gpu_bus, dev=0, fn=0, size=2)
except RuntimeError:
try: need_reset = (usb.pcie_cfg_req(pci.PCI_VENDOR_ID, bus=gpu_bus, dev=0, fn=0, size=2) != 0x1002)
except RuntimeError: need_reset = True
if need_reset or getenv("USB_RESCAN_BUS", 0) == 1:
for bus in range(gpu_bus):
usb.pcie_cfg_req(pci.PCI_SUBORDINATE_BUS, bus=bus, dev=0, fn=0, value=gpu_bus, size=1)
usb.pcie_cfg_req(pci.PCI_SECONDARY_BUS, bus=bus, dev=0, fn=0, value=bus+1, size=1)