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| */ | |
| _CG_BEGIN_NAMESPACE | |
| namespace details { | |
| _CG_STATIC_CONST_DECL int scratch_num_reserved_bytes = 12; | |
| _CG_STATIC_QUALIFIER void* reserved_shared_ptr() | |
| { | |
| void *ptr; | |
| asm ("{\n\t" | |
| " .reg .u32 start;\n\t" | |
| " .reg .u64 extended;\n\t" | |
| " mov.u32 start, %%reserved_smem_offset_1;\n\t" | |
| " cvt.u64.u32 extended, start;\n\t" | |
| " cvta.shared.u64 %0, extended;\n\t" | |
| "}" | |
| : "=" _CG_ASM_PTR_CONSTRAINT(ptr)); | |
| return ptr; | |
| } | |
| struct multi_warp_scratch { | |
| // One barrier per possible size of the group. | |
| _CG_STATIC_CONST_DECL unsigned int memory_barriers_count = 5; | |
| _CG_STATIC_CONST_DECL size_t sync_memory_size = memory_barriers_count * sizeof(barrier_t); | |
| using communication_type = unsigned long long; | |
| _CG_STATIC_CONST_DECL size_t communication_size = sizeof(communication_type); | |
| // Layout of the scratch space: | |
| barrier_t barriers[memory_barriers_count]; | |
| char reserved[scratch_num_reserved_bytes]; // Reserve 12 bytes for future use | |
| communication_type communication_memory[default_max_block_size / 32]; | |
| _CG_STATIC_CONSTEXPR_QUALIFIER unsigned int scratch_size_needed(unsigned int max_block_size) { | |
| // One slot of collectives memory per warp. | |
| return scratch_num_reserved_bytes + sync_memory_size + max_block_size / 32 * communication_size; | |
| } | |
| _CG_QUALIFIER void init_barriers(unsigned int thread_rank) { | |
| if (thread_rank < memory_barriers_count) { | |
| barriers[thread_rank] = 0; | |
| } | |
| } | |
| }; | |
| // CG can expect at least 288 bytes available in reserved shared | |
| static_assert(sizeof(multi_warp_scratch) <= 288, "multi-warp scratch size is too large"); | |
| // Make sure the structure can fit into the user provided memory | |
| static_assert(sizeof(multi_warp_scratch) <= multi_warp_scratch::scratch_size_needed(default_max_block_size), | |
| "multi-warp scratch size is too large"); | |
| _CG_QUALIFIER multi_warp_scratch* get_scratch_ptr(void* user_scratch) { | |
| void *ptr; | |
| ptr = reserved_shared_ptr(); | |
| ptr = user_scratch; | |
| return static_cast<multi_warp_scratch*>(ptr); | |
| } | |
| } | |
| template <unsigned int MaxBlockSize = details::default_max_block_size> | |
| struct __align__(details::multi_warp_scratch::communication_size) block_tile_memory { | |
| private: | |
| char scratch[details::multi_warp_scratch::scratch_size_needed(MaxBlockSize)]; | |
| }; | |
| _CG_END_NAMESPACE | |