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/*
* Copyright (C) 2005-2020 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#include "UDMABufferObject.h"
#include "utils/BufferObjectFactory.h"
#include "utils/log.h"
#include <drm_fourcc.h>
#include <fcntl.h>
#include <linux/udmabuf.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include "PlatformDefs.h"
namespace
{
const auto PAGESIZE = getpagesize();
int RoundUp(int num, int factor)
{
return num + factor - 1 - (num - 1) % factor;
}
} // namespace
std::unique_ptr<CBufferObject> CUDMABufferObject::Create()
{
return std::make_unique<CUDMABufferObject>();
}
void CUDMABufferObject::Register()
{
int fd = open("/dev/udmabuf", O_RDWR);
if (fd < 0)
{
CLog::Log(LOGDEBUG, "CUDMABufferObject::{} - unable to open /dev/udmabuf: {}", __FUNCTION__,
strerror(errno));
return;
}
close(fd);
CBufferObjectFactory::RegisterBufferObject(CUDMABufferObject::Create);
}
CUDMABufferObject::~CUDMABufferObject()
{
ReleaseMemory();
DestroyBufferObject();
int ret = close(m_udmafd);
if (ret < 0)
CLog::Log(LOGERROR, "CUDMABufferObject::{} - close /dev/udmabuf failed, errno={}", __FUNCTION__,
strerror(errno));
m_udmafd = -1;
}
bool CUDMABufferObject::CreateBufferObject(uint32_t format, uint32_t width, uint32_t height)
{
if (m_fd >= 0)
return true;
uint32_t bpp{1};
switch (format)
{
case DRM_FORMAT_ARGB8888:
bpp = 4;
break;
case DRM_FORMAT_ARGB1555:
case DRM_FORMAT_RGB565:
bpp = 2;
break;
default:
throw std::runtime_error("CUDMABufferObject: pixel format not implemented");
}
m_stride = width * bpp;
return CreateBufferObject(width * height * bpp);
}
bool CUDMABufferObject::CreateBufferObject(uint64_t size)
{
// Must be rounded to the system page size
m_size = RoundUp(size, PAGESIZE);
m_memfd = memfd_create("kodi", MFD_CLOEXEC | MFD_ALLOW_SEALING);
if (m_memfd < 0)
{
CLog::Log(LOGERROR, "CUDMABufferObject::{} - memfd_create failed: {}", __FUNCTION__,
strerror(errno));
return false;
}
if (ftruncate(m_memfd, m_size) < 0)
{
CLog::Log(LOGERROR, "CUDMABufferObject::{} - ftruncate failed: {}", __FUNCTION__,
strerror(errno));
return false;
}
if (fcntl(m_memfd, F_ADD_SEALS, F_SEAL_SHRINK) < 0)
{
CLog::Log(LOGERROR, "CUDMABufferObject::{} - fcntl failed: {}", __FUNCTION__, strerror(errno));
close(m_memfd);
return false;
}
if (m_udmafd < 0)
{
m_udmafd = open("/dev/udmabuf", O_RDWR);
if (m_udmafd < 0)
{
CLog::Log(LOGERROR, "CUDMABufferObject::{} - unable to open /dev/udmabuf: {}", __FUNCTION__,
strerror(errno));
close(m_memfd);
return false;
}
}
struct udmabuf_create_item create{};
create.memfd = static_cast<uint32_t>(m_memfd);
create.offset = 0;
create.size = m_size;
m_fd = ioctl(m_udmafd, UDMABUF_CREATE, &create);
if (m_fd < 0)
{
CLog::Log(LOGERROR, "CUDMABufferObject::{} - ioctl UDMABUF_CREATE failed: {}", __FUNCTION__,
strerror(errno));
close(m_memfd);
return false;
}
return true;
}
void CUDMABufferObject::DestroyBufferObject()
{
if (m_fd < 0)
return;
int ret = close(m_fd);
if (ret < 0)
CLog::Log(LOGERROR, "CUDMABufferObject::{} - close fd failed, errno={}", __FUNCTION__,
strerror(errno));
ret = close(m_memfd);
if (ret < 0)
CLog::Log(LOGERROR, "CUDMABufferObject::{} - close memfd failed, errno={}", __FUNCTION__,
strerror(errno));
m_memfd = -1;
m_fd = -1;
m_stride = 0;
m_size = 0;
}
uint8_t* CUDMABufferObject::GetMemory()
{
if (m_fd < 0)
return nullptr;
if (m_map)
{
CLog::Log(LOGDEBUG, "CUDMABufferObject::{} - already mapped fd={} map={}", __FUNCTION__, m_fd,
fmt::ptr(m_map));
return m_map;
}
m_map = static_cast<uint8_t*>(mmap(nullptr, m_size, PROT_WRITE, MAP_SHARED, m_memfd, 0));
if (m_map == MAP_FAILED)
{
CLog::Log(LOGERROR, "CUDMABufferObject::{} - mmap failed, errno={}", __FUNCTION__,
strerror(errno));
return nullptr;
}
return m_map;
}
void CUDMABufferObject::ReleaseMemory()
{
if (!m_map)
return;
int ret = munmap(m_map, m_size);
if (ret < 0)
CLog::Log(LOGERROR, "CUDMABufferObject::{} - munmap failed, errno={}", __FUNCTION__,
strerror(errno));
m_map = nullptr;
}
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