diff options
| author | Harvey Yang <chenghaoyang@chromium.org> | 2024-11-21 05:51:31 +0000 |
|---|---|---|
| committer | Kieran Bingham <kieran.bingham@ideasonboard.com> | 2024-11-28 16:44:08 +0000 |
| commit | 39482d59fe7160740ea5dd61f3ed965a88d848ce (patch) | |
| tree | bc6b51bf536d5c7b14f5e88ba7e1be975f1d04e6 /include | |
| parent | 562b6335d91fbebd5ab3122ea69a686cea7efa10 (diff) | |
DmaBufAllocator: Add Dma Buffer synchronization function & helper class
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/libcamera/internal/dma_buf_allocator.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/libcamera/internal/dma_buf_allocator.h b/include/libcamera/internal/dma_buf_allocator.h index 9211d483..fc5de2c1 100644 --- a/include/libcamera/internal/dma_buf_allocator.h +++ b/include/libcamera/internal/dma_buf_allocator.h @@ -12,6 +12,7 @@ #include <vector> #include <libcamera/base/flags.h> +#include <libcamera/base/shared_fd.h> #include <libcamera/base/unique_fd.h> namespace libcamera { @@ -48,6 +49,26 @@ private: 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 */ |