[Bug][DSV3.2] Always prepare metadata for DeepGEMM Sparse Attention (#35075)

Signed-off-by: Benjamin Chislett <bchislett@nvidia.com>

vllm/v1/attention/backends/mla/indexer.py

@@ -8,7 +8,7 @@ import torch
 from vllm.config import VllmConfig
 from vllm.logger import init_logger
 from vllm.platforms import current_platform
-from vllm.utils.deep_gemm import get_paged_mqa_logits_metadata, is_deep_gemm_supported
+from vllm.utils.deep_gemm import get_paged_mqa_logits_metadata, has_deep_gemm
 from vllm.v1.attention.backend import (
     AttentionBackend,
     AttentionCGSupport,
@@ -342,7 +342,9 @@ class DeepseekV32IndexerMetadataBuilder(AttentionMetadataBuilder):
                 offsets = None
 
             seq_lens = common_attn_metadata.seq_lens[:num_decodes]
-            if is_deep_gemm_supported():
+
+            # DeepGEMM is required for the paged MQA logits on CUDA devices
+            if current_platform.is_cuda() and has_deep_gemm():
                 self.scheduler_metadata_buffer[:] = get_paged_mqa_logits_metadata(
                     seq_lens, self.kv_cache_spec.block_size, self.num_sms
                 )