199 lines
6.7 KiB
C++
199 lines
6.7 KiB
C++
/***************************************************************************************************
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* Copyright (c) 2023 - 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************************************/
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#pragma once
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#include <cute/config.hpp>
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#include <cute/arch/copy.hpp>
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// Config
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#if (defined(__CUDA_ARCH__) && (__CUDA_ARCH__ >= 800))
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# define CUTE_ARCH_CP_ASYNC_SM80_ENABLED
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#endif
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namespace cute
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{
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/// Copy via cp.async with caching at all levels
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template <class TS, class TD = TS>
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struct SM80_CP_ASYNC_CACHEALWAYS
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{
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using SRegisters = TS[1];
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using DRegisters = TD[1];
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static_assert(sizeof(TS) == sizeof(TD), "cp.async requires sizeof(src_value_type) == sizeof(dst_value_type)");
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static_assert(sizeof(TS) == 4 || sizeof(TS) == 8 || sizeof(TS) == 16, "cp.async sizeof(TS) is not supported");
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CUTE_HOST_DEVICE static void
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copy(TS const& gmem_src,
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TD & smem_dst)
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{
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#if defined(CUTE_ARCH_CP_ASYNC_SM80_ENABLED)
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TS const* gmem_ptr = &gmem_src;
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uint32_t smem_int_ptr = cast_smem_ptr_to_uint(&smem_dst);
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asm volatile("cp.async.ca.shared.global.L2::128B [%0], [%1], %2;\n"
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:: "r"(smem_int_ptr),
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"l"(gmem_ptr),
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"n"(sizeof(TS)));
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#else
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CUTE_INVALID_CONTROL_PATH("Support for cp.async instructions has not been enabled");
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#endif
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}
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};
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/// Copy via cp.async with caching at global level
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template <class TS, class TD = TS>
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struct SM80_CP_ASYNC_CACHEGLOBAL
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{
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using SRegisters = TS[1];
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using DRegisters = TD[1];
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static_assert(sizeof(TS) == sizeof(TD), "cp.async requires sizeof(src_value_type) == sizeof(dst_value_type)");
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static_assert(sizeof(TS) == 4 || sizeof(TS) == 8 || sizeof(TS) == 16, "cp.async sizeof(TS) is not supported");
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CUTE_HOST_DEVICE static void
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copy(TS const& gmem_src,
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TD & smem_dst)
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{
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#if defined(CUTE_ARCH_CP_ASYNC_SM80_ENABLED)
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TS const* gmem_ptr = &gmem_src;
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uint32_t smem_int_ptr = cast_smem_ptr_to_uint(&smem_dst);
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asm volatile("cp.async.cg.shared.global.L2::128B [%0], [%1], %2;\n"
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:: "r"(smem_int_ptr),
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"l"(gmem_ptr),
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"n"(sizeof(TS)));
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#else
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CUTE_INVALID_CONTROL_PATH("Support for cp.async instructions has not been enabled");
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#endif
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}
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};
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/// Copy via cp.async with caching at all levels
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template <class TS, class TD = TS>
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struct SM80_CP_ASYNC_CACHEALWAYS_ZFILL
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{
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using SRegisters = TS[1];
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using DRegisters = TD[1];
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static_assert(sizeof(TS) == sizeof(TD), "cp.async requires sizeof(src_value_type) == sizeof(dst_value_type)");
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static_assert(sizeof(TS) == 4 || sizeof(TS) == 8 || sizeof(TS) == 16, "cp.async sizeof(TS) is not supported");
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CUTE_HOST_DEVICE static void
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copy(TS const& gmem_src,
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TD & smem_dst,
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bool pred)
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{
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#if defined(CUTE_ARCH_CP_ASYNC_SM80_ENABLED)
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TS const* gmem_ptr = &gmem_src;
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uint32_t smem_int_ptr = cast_smem_ptr_to_uint(&smem_dst);
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int src_size = pred ? sizeof(TS) : 0;
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asm volatile("cp.async.ca.shared.global.L2::128B [%0], [%1], %2, %3;\n"
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:: "r"(smem_int_ptr),
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"l"(gmem_ptr),
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"n"(sizeof(TS)),
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"r"(src_size));
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#else
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CUTE_INVALID_CONTROL_PATH("Support for cp.async instructions has not been enabled");
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#endif
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}
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};
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/// Copy via cp.async with caching at global level
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template <class TS, class TD = TS>
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struct SM80_CP_ASYNC_CACHEGLOBAL_ZFILL
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{
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using SRegisters = TS[1];
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using DRegisters = TD[1];
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static_assert(sizeof(TS) == sizeof(TD), "cp.async requires sizeof(src_value_type) == sizeof(dst_value_type)");
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static_assert(sizeof(TS) == 4 || sizeof(TS) == 8 || sizeof(TS) == 16, "cp.async sizeof(TS) is not supported");
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CUTE_HOST_DEVICE static void
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copy(TS const& gmem_src,
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TD & smem_dst,
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bool pred)
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{
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#if defined(CUTE_ARCH_CP_ASYNC_SM80_ENABLED)
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TS const* gmem_ptr = &gmem_src;
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uint32_t smem_int_ptr = cast_smem_ptr_to_uint(&smem_dst);
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int src_size = pred ? sizeof(TS) : 0;
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asm volatile("cp.async.cg.shared.global.L2::128B [%0], [%1], %2, %3;\n"
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:: "r"(smem_int_ptr),
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"l"(gmem_ptr),
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"n"(sizeof(TS)),
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"r"(src_size));
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#else
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CUTE_INVALID_CONTROL_PATH("Support for cp.async instructions has not been enabled");
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#endif
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/// Establishes an ordering w.r.t previously issued cp.async instructions. Does not block.
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CUTE_HOST_DEVICE
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void
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cp_async_fence()
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{
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#if defined(CUTE_ARCH_CP_ASYNC_SM80_ENABLED)
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asm volatile("cp.async.commit_group;\n" ::);
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#endif
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/// Blocks until all but N previous cp.async.commit_group operations have committed.
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template <int N>
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CUTE_HOST_DEVICE
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void
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cp_async_wait()
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{
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#if defined(CUTE_ARCH_CP_ASYNC_SM80_ENABLED)
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if constexpr (N == 0) {
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asm volatile("cp.async.wait_all;\n" ::);
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} else {
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asm volatile("cp.async.wait_group %0;\n" :: "n"(N));
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}
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#endif
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}
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template <int N>
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CUTE_HOST_DEVICE
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void
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cp_async_wait(Int<N>)
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{
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return cp_async_wait<N>();
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}
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/////////////////////////////////////////////////////////////////////////////////////////////////
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} // end namespace cute
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