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test(pinned): use mapped memory for UVA pointer check #125

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test(pinned): use mapped memory for UVA pointer check #125

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16 changes: 10 additions & 6 deletions tests/kernels/test_pinned_tensor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -115,17 +115,21 @@ def test_host_device_ptr_is_identity_under_uva():
if not torch.cuda.is_available():
pytest.skip("needs CUDA")

from freetoken.kernel.pinned import _host_ptr_identity, _load_pinned_extension
from freetoken.kernel.pinned import (
_host_ptr_identity,
_load_pinned_extension,
alloc_pinned_tensor,
)

torch.cuda.init()
if not _host_ptr_identity():
pytest.skip("non-UVA platform: host_device_ptr rejects unregistered memory instead")
# Under UVA cudaHostGetDevicePointer degenerates to identity for any host pointer
# (no registration validation); rejection of pageable memory only exists on
# non-identity platforms (Windows/WDDM), where the translation is real.
pageable = torch.empty(64, dtype=torch.uint8)
# CUDA 13 rejects unregistered pageable pointers even on Linux/UVA. Exercise
# only the supported pinned + mapped contract; pageable-pointer behavior is
# outside host_device_ptr's contract.
pinned = alloc_pinned_tensor(64, dtype=torch.uint8)
ext = _load_pinned_extension()
assert ext.host_device_ptr(pageable.data_ptr()) == pageable.data_ptr()
assert ext.host_device_ptr(pinned.data_ptr()) == pinned.data_ptr()


def test_host_bank_pin_registers_and_translates():
Expand Down