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// Copyright 2019 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "VkDeviceMemory.hpp"
#include "System/Debug.hpp"
#include "System/Linux/MemFd.hpp"
#include <errno.h>
#include <string.h>
#include <sys/mman.h>
class OpaqueFdExternalMemory : public vk::DeviceMemory, public vk::ObjectBase<OpaqueFdExternalMemory, VkDeviceMemory>
{
public:
static const VkExternalMemoryHandleTypeFlagBits typeFlagBit = VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT;
static bool SupportsAllocateInfo(const vk::DeviceMemory::ExtendedAllocationInfo &extendedAllocationInfo)
{
OpaqueFdAllocateInfo info(extendedAllocationInfo);
return info.importFd || info.exportFd;
}
explicit OpaqueFdExternalMemory(const VkMemoryAllocateInfo *pCreateInfo, void *mem, const vk::DeviceMemory::ExtendedAllocationInfo &extendedAllocationInfo, vk::Device *pDevice)
: vk::DeviceMemory(pCreateInfo, pDevice)
, allocateInfo(extendedAllocationInfo)
{
}
~OpaqueFdExternalMemory()
{
memfd.close();
}
VkResult allocateBuffer() override
{
if(allocateInfo.importFd)
{
memfd.importFd(allocateInfo.fd);
if(!memfd.isValid())
{
return VK_ERROR_INVALID_EXTERNAL_HANDLE;
}
}
else
{
ASSERT(allocateInfo.exportFd);
static int counter = 0;
char name[40];
snprintf(name, sizeof(name), "SwiftShader.Memory.%d", ++counter);
if(!memfd.allocate(name, allocationSize))
{
TRACE("memfd.allocate() returned %s", strerror(errno));
return VK_ERROR_OUT_OF_DEVICE_MEMORY;
}
}
void *addr = memfd.mapReadWrite(0, allocationSize);
if(!addr)
{
return VK_ERROR_MEMORY_MAP_FAILED;
}
buffer = addr;
return VK_SUCCESS;
}
void freeBuffer() override
{
memfd.unmap(buffer, allocationSize);
}
VkExternalMemoryHandleTypeFlagBits getFlagBit() const override
{
return typeFlagBit;
}
VkResult exportFd(int *pFd) const override
{
int fd = memfd.exportFd();
if(fd < 0)
{
return VK_ERROR_INVALID_EXTERNAL_HANDLE;
}
*pFd = fd;
return VK_SUCCESS;
}
private:
LinuxMemFd memfd;
OpaqueFdAllocateInfo allocateInfo;
};