vllm/csrc/cutlass_extensions/vllm_collective_builder.cuh

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#pragma once
#include "cutlass_extensions/gemm/collective/collective_builder.hpp"
namespace cutlass::gemm::collective {
using namespace cute;
//
// VLLMCollectiveBuilder is a wrapper around CollectiveBuilder that allows for
// for custom kernel tags, allowing you to build custom collectives. Without
// touching the cutlass library headers, using `CutlassKernelTag` will mean it
// will resort to using the standard cutlass collective builder.
//
// Use the default Cutlass collective builder, i.e. use an unmodified cutless
// collective
struct CutlassKernelTag {};
template <class KernelTag, class ArchTag, class OpClass, class ElementA,
class GmemLayoutA, int AlignmentA, class ElementB, class GmemLayoutB,
int AlignmentB, class ElementAccumulator, class TileShape_MNK,
class ClusterShape_MNK, class StageCountType,
class KernelScheduleType, class Enable = void>
struct VLLMCollectiveBuilder {
static_assert(sizeof(ElementA) == 0,
"Could not build a collective for given parameters.");
};
template <class ArchTag, class OpClass, class ElementA, class GmemLayoutA,
int AlignmentA, class ElementB, class GmemLayoutB, int AlignmentB,
class ElementAccumulator, class TileShape_MNK, class ClusterShape_MNK,
class StageCountType, class KernelScheduleType>
struct VLLMCollectiveBuilder<
CutlassKernelTag, ArchTag, OpClass, ElementA, GmemLayoutA, AlignmentA,
ElementB, GmemLayoutB, AlignmentB, ElementAccumulator, TileShape_MNK,
ClusterShape_MNK, StageCountType, KernelScheduleType> {
using CollectiveOp = typename CollectiveBuilder<
ArchTag, OpClass, ElementA, GmemLayoutA, AlignmentA, ElementB,
GmemLayoutB, AlignmentB, ElementAccumulator, TileShape_MNK,
ClusterShape_MNK, StageCountType, KernelScheduleType>::CollectiveOp;
};
}; // namespace cutlass::gemm::collective