Function mla_prefill_attention_320 

pub fn mla_prefill_attention_320(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    q: DevicePtr,
    k: DevicePtr,
    v: DevicePtr,
    output: DevicePtr,
    seq_len: u32,
    batch: u32,
    num_q_heads: u32,
    num_kv_heads: u32,
    head_dim: u32,
    inv_sqrt_d: f32,
    causal: bool,
    stream: u64,
) -> Result<()>

2026-09-25: Absorbed MLA prefill attention with scalar BF16 dot products and a single KV head. The head dim is the kernel’s MLA_HDIM: 320 in the mistral-small-4 fork, 576 in the deepseek-v4-flash one; both keep the entry name mla_prefill_attn_320.