| 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 "hdr/time_macros.h" |
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| 13 | #include "hdr/types/clock_t.h" |
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| 14 | #include "src/__support/GPU/utils.h" |
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| 15 | #include "src/__support/macros/config.h" |
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| 16 | |
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| 17 | namespace LIBC_NAMESPACE_DECL { |
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| 18 | |
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| 19 | #if defined(LIBC_TARGET_ARCH_IS_AMDGPU) |
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| 20 | // AMDGPU does not have a single set frequency. Different architectures and |
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| 21 | // cards can have different values. The actualy frequency needs to be read from |
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| 22 | // the kernel driver and will be between 25 MHz and 100 MHz on most cards. All |
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| 23 | // cards following the GFX9 ISAs use a 100 MHz clock so we will default to that. |
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| 24 | constexpr uint64_t clock_freq = 100000000UL; |
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| 25 | |
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| 26 | // We provide an externally visible symbol such that the runtime can set |
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| 27 | // this to the correct value. |
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| 28 | extern "C" { |
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| 29 | [[gnu::visibility("protected" )]] |
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| 30 | extern gpu::Constant<uint64_t> __llvm_libc_clock_freq; |
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| 31 | } |
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| 32 | #define GPU_CLOCKS_PER_SEC static_cast<clock_t>(__llvm_libc_clock_freq) |
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| 33 | |
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| 34 | #elif defined(LIBC_TARGET_ARCH_IS_NVPTX) |
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| 35 | // NPVTX uses a single 1 GHz fixed frequency clock for all target architectures. |
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| 36 | #define GPU_CLOCKS_PER_SEC static_cast<clock_t>(1000000000UL) |
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| 37 | #else |
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| 38 | #error "Unsupported target" |
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| 39 | #endif |
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| 40 | |
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| 41 | constexpr uint64_t TICKS_PER_SEC = 1000000000UL; |
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| 42 | |
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| 43 | } // namespace LIBC_NAMESPACE_DECL |
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| 44 | |
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| 45 | #endif // LLVM_LIBC_SRC_TIME_GPU_TIME_UTILS_H |
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| 46 | |
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