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// Copyright (C) 2021 - 2023 Advanced Micro Devices, Inc. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#ifndef ROCFFT_HOSTBUF_H
#define ROCFFT_HOSTBUF_H
#include "arithmetic.h"
#include <cstdlib>
#include <cstring>
#ifndef WIN32
#include <stdlib.h>
#include <sys/mman.h>
#endif
// Simple RAII class for host buffers. T is the type of pointer that
// data() returns
template <class T = void>
class hostbuf_t
{
public:
hostbuf_t() {}
// buffers are movable but not copyable
hostbuf_t(hostbuf_t&& other)
{
std::swap(buf, other.buf);
std::swap(bsize, other.bsize);
}
hostbuf_t& operator=(hostbuf_t&& other)
{
std::swap(buf, other.buf);
std::swap(bsize, other.bsize);
return *this;
}
hostbuf_t(const hostbuf_t&) = delete;
hostbuf_t& operator=(const hostbuf_t&) = delete;
~hostbuf_t()
{
free();
}
void alloc(size_t size)
{
bsize = size;
free();
// we're aligning to multiples of 64 bytes, so round the
// allocation size up to the nearest 64 to keep ASAN happy
if(size % 64)
{
size += 64 - size % 64;
}
// FFTW requires aligned allocations to use faster SIMD instructions.
// If enabling hugepages, align to 2 MiB. Otherwise, aligning to
// 64 bytes is enough for AVX instructions up to AVX512.
#ifdef WIN32
buf = _aligned_malloc(size, 64);
#else
// On Linux, ask for hugepages to reduce TLB pressure and
// improve performance. Allocations need to be aligned to
// the hugepage size, and rounded up to the next whole
// hugepage.
static const size_t TWO_MiB = 2 * 1024 * 1024;
if(size >= TWO_MiB)
{
size_t rounded_size = DivRoundingUp(size, TWO_MiB) * TWO_MiB;
buf = aligned_alloc(TWO_MiB, rounded_size);
madvise(buf, rounded_size, MADV_HUGEPAGE);
}
else
buf = aligned_alloc(64, size);
#endif
}
size_t size() const
{
return bsize;
}
void free()
{
if(buf != nullptr)
{
#ifdef WIN32
_aligned_free(buf);
#else
std::free(buf);
#endif
buf = nullptr;
bsize = 0;
}
}
T* data() const
{
return static_cast<T*>(buf);
}
// Copy method
hostbuf_t copy() const
{
hostbuf_t copy;
copy.alloc(bsize);
memcpy(copy.buf, buf, bsize);
return copy;
}
// shrink the buffer to fit the new size
void shrink(size_t new_size)
{
if(new_size > bsize)
throw std::runtime_error("can't shrink hostbuf to larger size");
// just pretend the buffer is now that size
bsize = new_size;
}
// equality/bool tests
bool operator==(std::nullptr_t n) const
{
return buf == n;
}
bool operator!=(std::nullptr_t n) const
{
return buf != n;
}
operator bool() const
{
return buf;
}
private:
// The host buffer
void* buf = nullptr;
size_t bsize = 0;
};
// default hostbuf that gives out void* pointers
typedef hostbuf_t<> hostbuf;
#endif
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