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[cpu][ci] Add CPU Attention Tests for Neon Backend #30347

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Merged
bigPYJ1151 merged 1 commit into from
Dec 10, 2025
Merged

[cpu][ci] Add CPU Attention Tests for Neon Backend #30347

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73 changes: 63 additions & 10 deletions tests/kernels/attention/test_cpu_attn.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,8 @@
import pytest
import torch

from vllm.platforms import current_platform
from vllm.platforms import CpuArchEnum, current_platform
from vllm.v1.attention.backends.cpu_attn import _get_attn_isa

if not current_platform.is_cpu():
pytest.skip("skipping CPU-only tests", allow_module_level=True)
Expand Down Expand Up @@ -36,6 +37,21 @@
]


def get_attn_isa(
block_size: int | None = None,
dtype: torch.dtype | None = None,
):
if block_size and dtype:
return _get_attn_isa(dtype, block_size)
else:
if current_platform.get_cpu_architecture() == CpuArchEnum.ARM:
return "neon"
elif torch._C._cpu._is_amx_tile_supported():
return "amx"
else:
return "vec"


# rand number generation takes too much time, cache rand tensors
@functools.lru_cache(maxsize=128, typed=False)
def tensor_cache(
Expand Down Expand Up @@ -452,6 +468,49 @@ def test_varlen_with_paged_kv_normal_vec16(
)


@pytest.mark.parametrize("seq_lens", SEQ_LENS)
@pytest.mark.parametrize("num_heads", NUM_HEADS)
@pytest.mark.parametrize("head_size", HEAD_SIZES)
@pytest.mark.parametrize("block_size", [96, 128])
@pytest.mark.parametrize("sliding_window", SLIDING_WINDOWS)
@pytest.mark.parametrize("dtype", QTYPES)
@pytest.mark.parametrize("soft_cap", [None])
@pytest.mark.parametrize("num_blocks", NUM_BLOCKS)
@pytest.mark.parametrize("use_alibi", [False])
@pytest.mark.parametrize("use_sink", [False])
@pytest.mark.parametrize("isa", ["neon"])
@pytest.mark.skipif(
current_platform.get_cpu_architecture() != CpuArchEnum.ARM,
reason="Not an Arm CPU.",
)
def test_varlen_with_paged_kv_normal_neon(
seq_lens: list[tuple[int, int]],
num_heads: tuple[int, int],
head_size: int,
sliding_window: int | None,
dtype: torch.dtype,
block_size: int,
soft_cap: float | None,
num_blocks: int,
use_alibi: bool,
use_sink: bool,
isa: str,
) -> None:
varlen_with_paged_kv(
seq_lens=seq_lens,
num_heads=num_heads,
head_size=head_size,
sliding_window=sliding_window,
dtype=dtype,
block_size=block_size,
soft_cap=soft_cap,
num_blocks=num_blocks,
use_alibi=use_alibi,
use_sink=use_sink,
isa=isa,
)


@pytest.mark.parametrize("seq_lens", SEQ_LENS)
@pytest.mark.parametrize("num_heads", NUM_HEADS)
@pytest.mark.parametrize("head_size", [96])
Expand All @@ -462,9 +521,7 @@ def test_varlen_with_paged_kv_normal_vec16(
@pytest.mark.parametrize("num_blocks", NUM_BLOCKS)
@pytest.mark.parametrize("use_alibi", [False])
@pytest.mark.parametrize("use_sink", [False])
@pytest.mark.parametrize(
"isa", ["amx"] if torch._C._cpu._is_amx_tile_supported() else ["vec"]
)
@pytest.mark.parametrize("isa", [get_attn_isa()])
def test_varlen_with_paged_kv_softcap(
seq_lens: list[tuple[int, int]],
num_heads: tuple[int, int],
Expand Down Expand Up @@ -503,9 +560,7 @@ def test_varlen_with_paged_kv_softcap(
@pytest.mark.parametrize("num_blocks", NUM_BLOCKS)
@pytest.mark.parametrize("use_alibi", [True])
@pytest.mark.parametrize("use_sink", [False])
@pytest.mark.parametrize(
"isa", ["amx"] if torch._C._cpu._is_amx_tile_supported() else ["vec"]
)
@pytest.mark.parametrize("isa", [get_attn_isa()])
def test_varlen_with_paged_kv_alibi(
seq_lens: list[tuple[int, int]],
num_heads: tuple[int, int],
Expand Down Expand Up @@ -544,9 +599,7 @@ def test_varlen_with_paged_kv_alibi(
@pytest.mark.parametrize("num_blocks", NUM_BLOCKS)
@pytest.mark.parametrize("use_alibi", [False])
@pytest.mark.parametrize("use_sink", [True])
@pytest.mark.parametrize(
"isa", ["amx"] if torch._C._cpu._is_amx_tile_supported() else ["vec"]
)
@pytest.mark.parametrize("isa", [get_attn_isa()])
def test_varlen_with_paged_kv_sink(
seq_lens: list[tuple[int, int]],
num_heads: tuple[int, int],
Expand Down