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/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of NVIDIA CORPORATION nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <cuda.h>
#include <vector>
////////////////////////////////////////////////////////////////////////////
//! Allocate virtually contiguous memory backed on separate devices
//! @return CUresult error code on failure.
//! @param[out] dptr Virtual address reserved for allocation
//! @param[out] allocationSize Actual amount of virtual address space reserved.
//! AllocationSize is needed in the free operation.
//! @param[in] size The minimum size to allocate (will be rounded up
//! to accomodate
//! required granularity).
//! @param[in] residentDevices Specifies what devices the allocation should be
//! striped across.
//! @param[in] mappingDevices Specifies what devices need to read/write to the
//! allocation.
//! @align Additional allignment requirement if desired.
//! @note The VA mappings will look like the following:
//!
//! v-stripeSize-v v-rounding -v
//! +-----------------------------------------+
//! | D1 | D2 | D3 |
//! +-----------------------------------------+
//! ^-- dptr ^-- dptr + size
//!
//! Each device in the residentDevices list will get an equal sized stripe.
//! Excess memory allocated will be that meets the minimum
//! granularity requirements of all the devices.
//!
//! @note uses cuMemGetAllocationGranularity cuMemCreate cuMemMap and
//! cuMemSetAccess
//! function calls to organize the va space
//!
//! @note uses cuMemRelease to release the allocationHandle. The allocation
//! handle
//! is not needed after its mappings are set up.
////////////////////////////////////////////////////////////////////////////
CUresult simpleMallocMultiDeviceMmap(
CUdeviceptr *dptr, size_t *allocationSize, size_t size,
const std::vector<CUdevice> &residentDevices,
const std::vector<CUdevice> &mappingDevices, size_t align = 0);
////////////////////////////////////////////////////////////////////////////
//! Frees resources allocated by simpleMallocMultiDeviceMmap
//! @CUresult CUresult error code on failure.
//! @param[in] dptr Virtual address reserved by simpleMallocMultiDeviceMmap
//! @param[in] size allocationSize returned by simpleMallocMultiDeviceMmap
////////////////////////////////////////////////////////////////////////////
CUresult simpleFreeMultiDeviceMmap(CUdeviceptr dptr, size_t size);
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