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paged-attention / torch-ext /torch_binding.cpp

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	#include <torch/library.h>

	#include "registration.h"

	#include "torch_binding.h"

	// Note on op signatures:
	// The X_meta signatures are for the meta functions corresponding to op X.
	// They must be kept in sync with the signature for X. Generally, only
	// functions that return Tensors require a meta function.
	//
	// See the following links for detailed docs on op registration and function
	// schemas.
	// https://docs.google.com/document/d/1_W62p8WJOQQUzPsJYa7s701JXt0qf2OfLub2sbkHOaU/edit#heading=h.ptttacy8y1u9
	// https://github.com/pytorch/pytorch/blob/main/aten/src/ATen/native/README.md#annotations

	TORCH_LIBRARY_EXPAND(TORCH_EXTENSION_NAME, ops) {
	// Attention ops
	// Compute the attention between an input query and the cached
	// keys/values using PagedAttention.
	ops.def(
	"paged_attention_v1("
	" Tensor! out, Tensor query, Tensor key_cache,"
	" Tensor value_cache, int num_kv_heads, float scale,"
	" Tensor block_tables, Tensor seq_lens, int block_size,"
	" int max_seq_len, Tensor? alibi_slopes,"
	" str kv_cache_dtype, Tensor k_scale, Tensor v_scale,"
	" int tp_rank, int blocksparse_local_blocks,"
	" int blocksparse_vert_stride, int blocksparse_block_size,"
	" int blocksparse_head_sliding_step) -> ()");
	#if defined(CUDA_KERNEL) \|\| defined(ROCM_KERNEL)
	ops.impl("paged_attention_v1", torch::kCUDA, &paged_attention_v1);
	#elif defined(METAL_KERNEL)
	ops.impl("paged_attention_v1", torch::kMPS, paged_attention_v1);
	#endif

	// PagedAttention V2.
	ops.def(
	"paged_attention_v2("
	" Tensor! out, Tensor! exp_sums, Tensor! max_logits,"
	" Tensor! tmp_out, Tensor query, Tensor key_cache,"
	" Tensor value_cache, int num_kv_heads, float scale,"
	" Tensor block_tables, Tensor seq_lens, int block_size,"
	" int max_seq_len, Tensor? alibi_slopes,"
	" str kv_cache_dtype, Tensor k_scale, Tensor v_scale,"
	" int tp_rank, int blocksparse_local_blocks,"
	" int blocksparse_vert_stride, int blocksparse_block_size,"
	" int blocksparse_head_sliding_step) -> ()");
	#if defined(CUDA_KERNEL) \|\| defined(ROCM_KERNEL)
	ops.impl("paged_attention_v2", torch::kCUDA, &paged_attention_v2);
	#elif defined(METAL_KERNEL)
	ops.impl("paged_attention_v2", torch::kMPS, paged_attention_v2);
	#endif

	// Swap in (out) the cache blocks from src to dst.
	ops.def(
	"swap_blocks(Tensor src, Tensor! dst, Tensor block_mapping) -> ()");
	#if defined(CUDA_KERNEL) \|\| defined(ROCM_KERNEL)
	ops.impl("swap_blocks", torch::kCUDA, &swap_blocks);
	#elif defined(METAL_KERNEL)
	ops.impl("swap_blocks", torch::kMPS, swap_blocks);
	#endif

	// Copy the cache blocks from src to dst.
	ops.def(
	"copy_blocks(Tensor(a!)[] key_caches, Tensor[](b!) value_caches, "
	"Tensor block_mapping) -> ()");
	#if defined(CUDA_KERNEL) \|\| defined(ROCM_KERNEL)
	ops.impl("copy_blocks", torch::kCUDA, &copy_blocks);
	#elif defined(METAL_KERNEL)
	ops.impl("copy_blocks", torch::kMPS, copy_blocks);
	#endif

	// Reshape the key and value tensors and cache them.
	ops.def(
	"reshape_and_cache(Tensor key, Tensor value,"
	" Tensor! key_cache, Tensor! value_cache,"
	" Tensor slot_mapping,"
	" str kv_cache_dtype,"
	" Tensor k_scale, Tensor v_scale) -> ()");
	#if defined(CUDA_KERNEL) \|\| defined(ROCM_KERNEL)
	ops.impl("reshape_and_cache", torch::kCUDA, &reshape_and_cache);
	#elif defined(METAL_KERNEL)
	ops.impl("reshape_and_cache", torch::kMPS, reshape_and_cache);
	#endif

	// Reshape the key and value tensors and cache them.
	ops.def(
	"reshape_and_cache_flash(Tensor key, Tensor value,"
	" Tensor! key_cache,"
	" Tensor! value_cache,"
	" Tensor slot_mapping,"
	" str kv_cache_dtype,"
	" Tensor k_scale, Tensor v_scale) -> ()");
	#if defined(CUDA_KERNEL) \|\| defined(ROCM_KERNEL)
	ops.impl("reshape_and_cache_flash", torch::kCUDA, &reshape_and_cache_flash);
	#elif defined(METAL_KERNEL)
	ops.impl("reshape_and_cache_flash", torch::kMPS, reshape_and_cache_flash);
	#endif

	// Gets the specified device attribute.
	ops.def("get_device_attribute(int attribute, int device_id) -> int");
	ops.impl("get_device_attribute", &get_device_attribute);

	// Gets the maximum shared memory per block device attribute.
	ops.def(
	"get_max_shared_memory_per_block_device_attribute(int device_id) -> int");
	ops.impl("get_max_shared_memory_per_block_device_attribute",
	&get_max_shared_memory_per_block_device_attribute);

	// Convert the key and value cache to fp8 data type.
	ops.def(
	"convert_fp8(Tensor! dst_cache, Tensor src_cache, float scale, "
	"str kv_cache_dtype) -> ()");
	#if defined(CUDA_KERNEL) \|\| defined(ROCM_KERNEL)
	ops.impl("convert_fp8", torch::kCUDA, &convert_fp8);
	#elif defined(METAL_KERNEL)
	ops.impl("convert_fp8", torch::kMPS, convert_fp8);
	#endif
	}

	REGISTER_EXTENSION(TORCH_EXTENSION_NAME)