mirror of
https://github.com/NVIDIA/cuda-samples.git
synced 2024-11-24 21:39:17 +08:00
78 lines
3.9 KiB
C++
78 lines
3.9 KiB
C++
/* Copyright (c) 2019, 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);
|