110 lines
5.4 KiB
Plaintext
110 lines
5.4 KiB
Plaintext
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#include <flashinfer/attention/decode_mla_cute_sm80.cuh>
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#include <flashinfer/attention/scheduler.cuh>
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#include <optional>
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#include "mla_config.inc"
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#include "pytorch_conversion_utils.h"
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#include "pytorch_extension_utils.h"
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using namespace flashinfer;
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at::Tensor BatchDecodeWithPagedKVCachePlanMLA(at::Tensor float_workspace_buffer,
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at::Tensor int_workspace_buffer,
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at::Tensor page_locked_int_workspace_buffer,
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at::Tensor indptr, int64_t batch_size,
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int64_t num_qo_heads, int64_t page_size,
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bool enable_cuda_graph) {
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size_t float_workspace_size_in_bytes =
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float_workspace_buffer.size(0) * float_workspace_buffer.element_size();
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size_t int_workspace_size_in_bytes =
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int_workspace_buffer.size(0) * int_workspace_buffer.element_size();
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DecodePlanInfo plan_info;
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const c10::cuda::OptionalCUDAGuard device_guard(float_workspace_buffer.device());
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const cudaStream_t stream = c10::cuda::getCurrentCUDAStream();
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auto work_estimation_func = BatchDecodeWithPagedKVCacheWorkEstimationDispatchedMlaCuteSM80<
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HEAD_DIM_CKV, HEAD_DIM_KPE, QO_TILE_LEN, AttentionVariant, Params>;
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cudaError_t status =
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DecodePlan<HEAD_DIM_CKV, flashinfer::PosEncodingMode::kNone, AttentionVariant, Params>(
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static_cast<void*>(float_workspace_buffer.data_ptr()), float_workspace_size_in_bytes,
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static_cast<void*>(int_workspace_buffer.data_ptr()),
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static_cast<void*>(page_locked_int_workspace_buffer.data_ptr()),
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int_workspace_size_in_bytes, plan_info, static_cast<IdType*>(indptr.data_ptr()),
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batch_size, num_qo_heads, page_size, enable_cuda_graph, /*stream=*/stream,
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work_estimation_func);
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TORCH_CHECK(status == cudaSuccess, "BatchDecodeWithPagedKVCachePlanMLA failed with error ",
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cudaGetErrorString(status));
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return vec_to_tensor(plan_info.ToVector());
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}
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void BatchDecodeWithPagedKVCacheRunMLA(
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at::Tensor float_workspace_buffer, at::Tensor int_workspace_buffer, at::Tensor plan_info_vec,
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at::Tensor q_nope, at::Tensor q_pe, at::Tensor paged_ckv_cache, at::Tensor paged_kpe_cache,
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at::Tensor paged_kv_indptr, at::Tensor paged_kv_indices, at::Tensor paged_kv_last_page_len,
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at::Tensor o, double sm_scale, int64_t window_left, double logits_soft_cap, double rope_scale,
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double rope_theta, std::optional<at::Tensor> maybe_lse,
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bool enable_pdl // fake placeholder, sm80 does not support pdl
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) {
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DecodePlanInfo plan_info;
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plan_info.FromVector(tensor_to_vec(plan_info_vec));
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auto device = q_nope.device();
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int64_t batch_size = q_nope.size(0);
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int64_t num_qo_heads = q_nope.size(1);
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int64_t page_size = paged_ckv_cache.size(1);
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if (maybe_lse) {
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const auto& lse = *maybe_lse;
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TORCH_CHECK(lse.size(0) == batch_size, lse.size(0), q_nope.size(0));
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TORCH_CHECK(lse.size(1) == num_qo_heads, lse.size(1), q_nope.size(1));
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}
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TORCH_CHECK(logits_soft_cap >= 0.f, "logits_soft_cap must be non-negative");
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void* float_buffer = static_cast<void*>(float_workspace_buffer.data_ptr());
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void* int_buffer = static_cast<void*>(int_workspace_buffer.data_ptr());
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paged_kv_mla_t<DTypeKV, IdType> paged_kv(
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page_size, HEAD_DIM_CKV, HEAD_DIM_KPE, batch_size,
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static_cast<DTypeKV*>(paged_ckv_cache.data_ptr()), paged_ckv_cache.strides().data(),
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static_cast<DTypeKV*>(paged_kpe_cache.data_ptr()), paged_kpe_cache.strides().data(),
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static_cast<IdType*>(paged_kv_indices.data_ptr()),
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static_cast<IdType*>(paged_kv_indptr.data_ptr()),
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static_cast<IdType*>(paged_kv_last_page_len.data_ptr()));
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Params params(static_cast<DTypeQ*>(q_nope.data_ptr()), static_cast<DTypeQ*>(q_pe.data_ptr()),
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/*q_offset=*/nullptr, paged_kv, static_cast<DTypeO*>(o.data_ptr()),
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/*lse=*/(maybe_lse ? static_cast<float*>(maybe_lse->data_ptr()) : nullptr),
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num_qo_heads, window_left, logits_soft_cap, sm_scale, rope_scale, rope_theta);
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DTypeO* tmp_v = nullptr;
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float* tmp_s = nullptr;
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params.request_indices =
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GetPtrFromBaseOffset<IdType>(int_buffer, plan_info.request_indices_offset);
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params.kv_tile_indices =
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GetPtrFromBaseOffset<IdType>(int_buffer, plan_info.kv_tile_indices_offset);
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params.o_indptr = GetPtrFromBaseOffset<IdType>(int_buffer, plan_info.o_indptr_offset);
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params.kv_chunk_size_ptr =
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GetPtrFromBaseOffset<IdType>(int_buffer, plan_info.kv_chunk_size_ptr_offset);
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if (plan_info.split_kv) {
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tmp_v = GetPtrFromBaseOffset<DTypeO>(float_buffer, plan_info.v_offset);
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tmp_s = GetPtrFromBaseOffset<float>(float_buffer, plan_info.s_offset);
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if (plan_info.enable_cuda_graph) {
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params.block_valid_mask =
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GetPtrFromBaseOffset<bool>(int_buffer, plan_info.block_valid_mask_offset);
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}
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}
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params.padded_batch_size = plan_info.padded_batch_size;
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const c10::cuda::OptionalCUDAGuard device_guard(paged_ckv_cache.device());
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const cudaStream_t stream = c10::cuda::getCurrentCUDAStream();
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cudaError_t status = BatchDecodeWithPagedKVCacheDispatchedMlaCuteSM80<HEAD_DIM_CKV, HEAD_DIM_KPE,
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QO_TILE_LEN, Params>(
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params, tmp_v, tmp_s, /*stream=*/stream);
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TORCH_CHECK(status == cudaSuccess, "BatchDecodeWithPagedKVCache failed with error ",
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cudaGetErrorString(status));
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}
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