044a77352f
NOTE: this feature is not ready for user testing, and not yet enabled in daily builds. It is being merged now for easier collaboration on development. HIP is a heterogenous compute interface allowing C++ code to be executed on GPUs similar to CUDA. It is intended to bring back AMD GPU rendering support on Windows and Linux. https://github.com/ROCm-Developer-Tools/HIP. As of the time of writing, it should compile and run on Linux with existing HIP compilers and driver runtimes. Publicly available compilers and drivers for Windows will come later. See task T91571 for more details on the current status and work remaining to be done. Credits: Sayak Biswas (AMD) Arya Rafii (AMD) Brian Savery (AMD) Differential Revision: https://developer.blender.org/D12578
58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
/*
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* Copyright 2011-2021 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Device data taken from HIP occupancy calculator.
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*
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* Terminology
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* - HIP GPUs have multiple streaming multiprocessors
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* - Each multiprocessor executes multiple thread blocks
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* - Each thread block contains a number of threads, also known as the block size
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* - Multiprocessors have a fixed number of registers, and the amount of registers
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* used by each threads limits the number of threads per block.
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*/
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/* Launch Bound Definitions */
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#define GPU_MULTIPRESSOR_MAX_REGISTERS 65536
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#define GPU_MULTIPROCESSOR_MAX_BLOCKS 64
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#define GPU_BLOCK_MAX_THREADS 1024
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#define GPU_THREAD_MAX_REGISTERS 255
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#define GPU_KERNEL_BLOCK_NUM_THREADS 1024
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#define GPU_KERNEL_MAX_REGISTERS 64
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/* Compute number of threads per block and minimum blocks per multiprocessor
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* given the maximum number of registers per thread. */
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#define ccl_gpu_kernel(block_num_threads, thread_num_registers) \
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extern "C" __global__ void __launch_bounds__(block_num_threads, \
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GPU_MULTIPRESSOR_MAX_REGISTERS / \
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(block_num_threads * thread_num_registers))
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/* sanity checks */
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#if GPU_KERNEL_BLOCK_NUM_THREADS > GPU_BLOCK_MAX_THREADS
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# error "Maximum number of threads per block exceeded"
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#endif
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#if GPU_MULTIPRESSOR_MAX_REGISTERS / (GPU_KERNEL_BLOCK_NUM_THREADS * GPU_KERNEL_MAX_REGISTERS) > \
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GPU_MULTIPROCESSOR_MAX_BLOCKS
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# error "Maximum number of blocks per multiprocessor exceeded"
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#endif
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#if GPU_KERNEL_MAX_REGISTERS > GPU_THREAD_MAX_REGISTERS
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# error "Maximum number of registers per thread exceeded"
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#endif
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