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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_GPUBUF_H
#define ROCFFT_GPUBUF_H
#include "rocfft_hip.h"
#include <cstdlib>
// Simple RAII class for GPU buffers. T is the type of pointer that
// data() returns
template <class T = void>
class gpubuf_t
{
public:
gpubuf_t() {}
// buffers are movable but not copyable
gpubuf_t(gpubuf_t&& other)
{
std::swap(buf, other.buf);
std::swap(bsize, other.bsize);
std::swap(device, other.device);
}
gpubuf_t& operator=(gpubuf_t&& other)
{
std::swap(buf, other.buf);
std::swap(bsize, other.bsize);
std::swap(device, other.device);
return *this;
}
gpubuf_t(const gpubuf_t&) = delete;
gpubuf_t& operator=(const gpubuf_t&) = delete;
~gpubuf_t()
{
free();
}
static bool use_alloc_managed()
{
return std::getenv("ROCFFT_MALLOC_MANAGED");
}
hipError_t alloc(const size_t size)
{
// remember the device that was current as of alloc, so we can
// free on the correct device
auto ret = hipGetDevice(&device);
if(ret != hipSuccess)
return ret;
bsize = size;
static bool alloc_managed = use_alloc_managed();
free();
ret = alloc_managed ? hipMallocManaged(&buf, bsize) : hipMalloc(&buf, bsize);
if(ret != hipSuccess)
{
buf = nullptr;
bsize = 0;
}
return ret;
}
size_t size() const
{
return bsize;
}
void free()
{
if(buf != nullptr)
{
// free on the device we allocated on
rocfft_scoped_device dev(device);
(void)hipFree(buf);
buf = nullptr;
bsize = 0;
}
}
// return a pointer to the allocated memory, offset by the
// specified number of bytes
T* data_offset(size_t offset_bytes = 0) const
{
void* ptr = static_cast<char*>(buf) + offset_bytes;
return static_cast<T*>(ptr);
}
T* data() const
{
return static_cast<T*>(buf);
}
// 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 GPU buffer
void* buf = nullptr;
size_t bsize = 0;
int device = 0;
};
// default gpubuf that gives out void* pointers
typedef gpubuf_t<> gpubuf;
#endif
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