| 1 | //===-- Generic utilities for GPU timing ----------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #ifndef LLVM_LIBC_SRC_TIME_GPU_TIME_UTILS_H |
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| 10 | #define LLVM_LIBC_SRC_TIME_GPU_TIME_UTILS_H |
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| 11 | |
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| 12 | #include "src/__support/GPU/utils.h" |
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| 13 | |
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| 14 | namespace LIBC_NAMESPACE { |
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| 15 | |
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| 16 | #if defined(LIBC_TARGET_ARCH_IS_AMDGPU) |
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| 17 | // AMDGPU does not have a single set frequency. Different architectures and |
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| 18 | // cards can have different values. The actualy frequency needs to be read from |
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| 19 | // the kernel driver and will be between 25 MHz and 100 MHz on most cards. All |
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| 20 | // cards following the GFX9 ISAs use a 100 MHz clock so we will default to that. |
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| 21 | constexpr uint64_t clock_freq = 100000000UL; |
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| 22 | |
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| 23 | // We provide an externally visible symbol such that the runtime can set |
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| 24 | // this to the correct value. |
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| 25 | extern "C" [[gnu::visibility("protected" )]] uint64_t |
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| 26 | [[clang::address_space(4)]] __llvm_libc_clock_freq; |
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| 27 | #define GPU_CLOCKS_PER_SEC static_cast<clock_t>(__llvm_libc_clock_freq) |
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| 28 | |
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| 29 | #elif defined(LIBC_TARGET_ARCH_IS_NVPTX) |
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| 30 | // NPVTX uses a single 1 GHz fixed frequency clock for all target architectures. |
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| 31 | #define GPU_CLOCKS_PER_SEC static_cast<clock_t>(1000000000UL) |
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| 32 | #else |
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| 33 | #error "Unsupported target" |
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| 34 | #endif |
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| 35 | |
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| 36 | } // namespace LIBC_NAMESPACE |
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| 37 | |
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| 38 | #endif // LLVM_LIBC_SRC_TIME_GPU_TIME_UTILS_H |
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| 39 | |
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