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78 lines
3.9 KiB
C++
78 lines
3.9 KiB
C++
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/* Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <cuda.h>
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#include <vector>
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////////////////////////////////////////////////////////////////////////////
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//! Allocate virtually contiguous memory backed on separate devices
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//! @return CUresult error code on failure.
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//! @param[out] dptr Virtual address reserved for allocation
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//! @param[out] allocationSize Actual amount of virtual address space reserved.
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//! AllocationSize is needed in the free operation.
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//! @param[in] size The minimum size to allocate (will be rounded up
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//! to accomodate
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//! required granularity).
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//! @param[in] residentDevices Specifies what devices the allocation should be
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//! striped across.
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//! @param[in] mappingDevices Specifies what devices need to read/write to the
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//! allocation.
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//! @align Additional allignment requirement if desired.
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//! @note The VA mappings will look like the following:
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//!
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//! v-stripeSize-v v-rounding -v
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//! +-----------------------------------------+
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//! | D1 | D2 | D3 |
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//! +-----------------------------------------+
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//! ^-- dptr ^-- dptr + size
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//!
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//! Each device in the residentDevices list will get an equal sized stripe.
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//! Excess memory allocated will be that meets the minimum
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//! granularity requirements of all the devices.
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//!
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//! @note uses cuMemGetAllocationGranularity cuMemCreate cuMemMap and
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//! cuMemSetAccess
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//! function calls to organize the va space
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//!
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//! @note uses cuMemRelease to release the allocationHandle. The allocation
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//! handle
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//! is not needed after its mappings are set up.
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////////////////////////////////////////////////////////////////////////////
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CUresult simpleMallocMultiDeviceMmap(
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CUdeviceptr *dptr, size_t *allocationSize, size_t size,
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const std::vector<CUdevice> &residentDevices,
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const std::vector<CUdevice> &mappingDevices, size_t align = 0);
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////////////////////////////////////////////////////////////////////////////
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//! Frees resources allocated by simpleMallocMultiDeviceMmap
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//! @CUresult CUresult error code on failure.
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//! @param[in] dptr Virtual address reserved by simpleMallocMultiDeviceMmap
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//! @param[in] size allocationSize returned by simpleMallocMultiDeviceMmap
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////////////////////////////////////////////////////////////////////////////
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CUresult simpleFreeMultiDeviceMmap(CUdeviceptr dptr, size_t size);
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