330d8983d2
In a nutshell, this moves our libomptarget code to populate the offload subproject. With this commit, users need to enable the new LLVM/Offload subproject as a runtime in their cmake configuration. No further changes are expected for downstream code. Tests and other components still depend on OpenMP and have also not been renamed. The results below are for a build in which OpenMP and Offload are enabled runtimes. In addition to the pure `git mv`, we needed to adjust some CMake files. Nothing is intended to change semantics. ``` ninja check-offload ``` Works with the X86 and AMDGPU offload tests ``` ninja check-openmp ``` Still works but doesn't build offload tests anymore. ``` ls install/lib ``` Shows all expected libraries, incl. - `libomptarget.devicertl.a` - `libomptarget-nvptx-sm_90.bc` - `libomptarget.rtl.amdgpu.so` -> `libomptarget.rtl.amdgpu.so.18git` - `libomptarget.so` -> `libomptarget.so.18git` Fixes: https://github.com/llvm/llvm-project/issues/75124 --------- Co-authored-by: Saiyedul Islam <Saiyedul.Islam@amd.com>
135 lines
3.6 KiB
C++
135 lines
3.6 KiB
C++
//===--------- Misc.cpp - OpenMP device misc interfaces ----------- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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//
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//===----------------------------------------------------------------------===//
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#include "Configuration.h"
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#include "Types.h"
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#include "Debug.h"
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#pragma omp begin declare target device_type(nohost)
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namespace ompx {
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namespace impl {
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double getWTick();
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double getWTime();
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/// AMDGCN Implementation
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///
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///{
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#pragma omp begin declare variant match(device = {arch(amdgcn)})
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double getWTick() {
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// The number of ticks per second for the AMDGPU clock varies by card and can
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// only be retrived by querying the driver. We rely on the device environment
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// to inform us what the proper frequency is.
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return 1.0 / config::getClockFrequency();
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}
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double getWTime() {
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uint64_t NumTicks = 0;
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if constexpr (__has_builtin(__builtin_amdgcn_s_sendmsg_rtnl))
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NumTicks = __builtin_amdgcn_s_sendmsg_rtnl(0x83);
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else if constexpr (__has_builtin(__builtin_amdgcn_s_memrealtime))
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NumTicks = __builtin_amdgcn_s_memrealtime();
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else if constexpr (__has_builtin(__builtin_amdgcn_s_memtime))
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NumTicks = __builtin_amdgcn_s_memtime();
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return static_cast<double>(NumTicks) * getWTick();
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}
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#pragma omp end declare variant
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/// NVPTX Implementation
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///
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///{
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#pragma omp begin declare variant match( \
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device = {arch(nvptx, nvptx64)}, \
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implementation = {extension(match_any)})
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double getWTick() {
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// Timer precision is 1ns
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return ((double)1E-9);
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}
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double getWTime() {
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uint64_t nsecs = __nvvm_read_ptx_sreg_globaltimer();
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return static_cast<double>(nsecs) * getWTick();
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}
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#pragma omp end declare variant
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/// Lookup a device-side function using a host pointer /p HstPtr using the table
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/// provided by the device plugin. The table is an ordered pair of host and
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/// device pointers sorted on the value of the host pointer.
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void *indirectCallLookup(void *HstPtr) {
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if (!HstPtr)
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return nullptr;
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struct IndirectCallTable {
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void *HstPtr;
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void *DevPtr;
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};
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IndirectCallTable *Table =
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reinterpret_cast<IndirectCallTable *>(config::getIndirectCallTablePtr());
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uint64_t TableSize = config::getIndirectCallTableSize();
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// If the table is empty we assume this is device pointer.
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if (!Table || !TableSize)
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return HstPtr;
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uint32_t Left = 0;
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uint32_t Right = TableSize;
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// If the pointer is definitely not contained in the table we exit early.
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if (HstPtr < Table[Left].HstPtr || HstPtr > Table[Right - 1].HstPtr)
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return HstPtr;
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while (Left != Right) {
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uint32_t Current = Left + (Right - Left) / 2;
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if (Table[Current].HstPtr == HstPtr)
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return Table[Current].DevPtr;
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if (HstPtr < Table[Current].HstPtr)
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Right = Current;
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else
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Left = Current;
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}
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// If we searched the whole table and found nothing this is a device pointer.
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return HstPtr;
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}
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} // namespace impl
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} // namespace ompx
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/// Interfaces
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///
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///{
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extern "C" {
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int32_t __kmpc_cancellationpoint(IdentTy *, int32_t, int32_t) { return 0; }
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int32_t __kmpc_cancel(IdentTy *, int32_t, int32_t) { return 0; }
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double omp_get_wtick(void) { return ompx::impl::getWTick(); }
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double omp_get_wtime(void) { return ompx::impl::getWTime(); }
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void *__llvm_omp_indirect_call_lookup(void *HstPtr) {
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return ompx::impl::indirectCallLookup(HstPtr);
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}
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}
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///}
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#pragma omp end declare target
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