39482d59fe
To synchronize CPU access with mmap and hardware access on DMA buffers, using `DMA_BUF_IOCTL_SYNC` is required. This patch adds a function and a helper class to allow users to sync buffers more easily. Signed-off-by: Han-Lin Chen <hanlinchen@chromium.org> Co-developed-by: Harvey Yang <chenghaoyang@chromium.org> Signed-off-by: Harvey Yang <chenghaoyang@chromium.org> Reviewed-by: Milan Zamazal <mzamazal@redhat.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
75 lines
1.5 KiB
C++
75 lines
1.5 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
|
/*
|
|
* Copyright (C) 2020, Raspberry Pi Ltd
|
|
*
|
|
* Helper class for dma-buf allocations.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <memory>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include <libcamera/base/flags.h>
|
|
#include <libcamera/base/shared_fd.h>
|
|
#include <libcamera/base/unique_fd.h>
|
|
|
|
namespace libcamera {
|
|
|
|
class FrameBuffer;
|
|
|
|
class DmaBufAllocator
|
|
{
|
|
public:
|
|
enum class DmaBufAllocatorFlag {
|
|
CmaHeap = 1 << 0,
|
|
SystemHeap = 1 << 1,
|
|
UDmaBuf = 1 << 2,
|
|
};
|
|
|
|
using DmaBufAllocatorFlags = Flags<DmaBufAllocatorFlag>;
|
|
|
|
DmaBufAllocator(DmaBufAllocatorFlags flags = DmaBufAllocatorFlag::CmaHeap);
|
|
~DmaBufAllocator();
|
|
bool isValid() const { return providerHandle_.isValid(); }
|
|
UniqueFD alloc(const char *name, std::size_t size);
|
|
|
|
int exportBuffers(unsigned int count,
|
|
const std::vector<unsigned int> &planeSizes,
|
|
std::vector<std::unique_ptr<FrameBuffer>> *buffers);
|
|
|
|
private:
|
|
std::unique_ptr<FrameBuffer> createBuffer(
|
|
std::string name, const std::vector<unsigned int> &planeSizes);
|
|
|
|
UniqueFD allocFromHeap(const char *name, std::size_t size);
|
|
UniqueFD allocFromUDmaBuf(const char *name, std::size_t size);
|
|
UniqueFD providerHandle_;
|
|
DmaBufAllocatorFlag type_;
|
|
};
|
|
|
|
class DmaSyncer final
|
|
{
|
|
public:
|
|
enum class SyncType {
|
|
Read = 0,
|
|
Write,
|
|
ReadWrite,
|
|
};
|
|
|
|
explicit DmaSyncer(SharedFD fd, SyncType type = SyncType::ReadWrite);
|
|
|
|
~DmaSyncer();
|
|
|
|
private:
|
|
void sync(uint64_t step);
|
|
|
|
SharedFD fd_;
|
|
uint64_t flags_ = 0;
|
|
};
|
|
|
|
LIBCAMERA_FLAGS_ENABLE_OPERATORS(DmaBufAllocator::DmaBufAllocatorFlag)
|
|
|
|
} /* namespace libcamera */
|