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mma_sm90_desc.hpp
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/***************************************************************************************************
* Copyright (c) 2023 - 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************************************/
#pragma once
#include <cute/arch/config.hpp>
#include <cute/arch/mma.hpp>
////////////////////////////////////////////////////////////////////////////////////////////////////
namespace cute {
////////////////////////////////////////////////////////////////////////////////////////////////////
// GMMA Descriptor and utilities
// GMMA enums and utilities
namespace SM90::GMMA {
enum class LayoutType : uint8_t {
INTERLEAVE = 0,
B128 = 1,
B64 = 2,
B32 = 3,
};
CUTE_HOST_DEVICE char const* to_string(LayoutType const& t) {
switch (t) {
case LayoutType::INTERLEAVE: return "INTERLEAVE";
case LayoutType::B128: return "B128";
case LayoutType::B64: return "B64";
case LayoutType::B32: return "B32";
}
return nullptr;
}
#if !defined(__CUDACC_RTC__)
// Output operator for all enums in this namespace
CUTE_HOST std::ostream& operator<<(std::ostream& os, LayoutType const& t) {
char const* s = to_string(t);
if (s) {
std::operator<<(os, s); // Explicit call to avoid ambiguity
} else {
os.setstate(std::ios_base::failbit);
}
return os;
}
#endif // !defined(__CUDACC_RTC__)
} // end namespace SM90::GMMA
union GmmaDescriptor
{
CUTE_HOST_DEVICE constexpr
GmmaDescriptor() noexcept : desc_(0) {}
CUTE_HOST_DEVICE constexpr
GmmaDescriptor(uint64_t desc) noexcept : desc_(desc) {}
CUTE_HOST_DEVICE constexpr
GmmaDescriptor(GmmaDescriptor const& t) noexcept : desc_(t.desc_) {}
CUTE_HOST_DEVICE constexpr
GmmaDescriptor(GmmaDescriptor && t) noexcept : desc_(t.desc_) {}
CUTE_HOST_DEVICE constexpr
GmmaDescriptor& operator=(GmmaDescriptor const& t) noexcept {
desc_ = t.desc_;
return *this;
}
CUTE_HOST_DEVICE constexpr
GmmaDescriptor& operator=(GmmaDescriptor && t) noexcept {
desc_ = t.desc_;
return *this;
}
uint64_t desc_;
uint32_t reg32_[2];
uint16_t reg16_[4];
// Bitfield implementation avoids the need for shifts in assignment
struct {
// start_address, bit [0,14), 4LSB not included
uint16_t start_address_ : 14, : 2; // 14 bits [0,14), 2 bits unused
// leading dimension byte offset, bit [16,30), 4LSB not included
// For N: This is the stride from the first col to the second col of the 8x2 brick in INTERLEAVED
// Unused for all SWIZZLE_* layouts (and assumed to be 1)
// For T: This is the stride from the first 8 rows to the next 8 rows.
uint16_t leading_byte_offset_ : 14, : 2; // 14 bits [0,14), 2 bits unused
// stride dimension byte offset, bit [32,46), 4LSB not included
// For N: This is the stride from the first 8 rows to the next 8 rows.
// For T: This is the stride fro mthe first 8 cols to the next 8 cols.
uint16_t stride_byte_offset_ : 14, : 2; // 14 bits [0,14), 2 bits unused
// base_offset, bit [49,52)
// Valid only for SWIZZLE_128B and SWIZZLE_64B
uint8_t : 1, base_offset_ : 3, : 4; // 1 bit unused, 3 bits [1,4), 4 bits unused
// layout type, bit [62,64)
// SWIZZLE_NONE = 0, SWIZZLE_32B = 3, SWIZZLE_64B = 2, SWIZZLE_128B = 1
uint8_t : 6, layout_type_ : 2; // 6 bits unused, 2 bits [6,8)
} bitfield;
// Decay to a uint64_t
CUTE_HOST_DEVICE constexpr
operator uint64_t() const noexcept { return desc_; }
};
// Printer
CUTE_HOST_DEVICE void
print(GmmaDescriptor const& t)
{
#if !defined(__CUDACC_RTC__)
printf("GmmaDescriptor: 0x%016llx\n", static_cast<unsigned long long>(t.desc_));
printf(" start_addr : 0x%04x\n", t.bitfield.start_address_);
printf(" leading_off: 0x%04x (%d)\n", t.bitfield.leading_byte_offset_, t.bitfield.leading_byte_offset_);
printf(" stride_off : 0x%04x (%d)\n", t.bitfield.stride_byte_offset_, t.bitfield.stride_byte_offset_);
printf(" base_offset: 0x%01x\n", t.bitfield.base_offset_);
printf(" layout_type: 0x%01x (%s)\n", t.bitfield.layout_type_, to_string(static_cast<SM90::GMMA::LayoutType>(t.bitfield.layout_type_)));
#endif // !defined(__CUDACC_RTC__)
}
////////////////////////////////////////////////////////////////////////////////////////////////////
} // namespace cute
////////////////////////////////////////////////////////////////////////////////////////////////////