Support DMA-BUF memory type in buffer queue #41
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liangchingyun
commented
Jun 17, 2025
liangchingyun
commented
- Added VB2_DMABUF to vb2_queue.io_modes
- Set mem_ops to vb2_dma_contig_memops for physically contiguous memory
- Implemented buf_init() and buf_cleanup() to manage per-buffer state
- Added VB2_DMABUF to vb2_queue.io_modes - Set mem_ops to vb2_dma_contig_memops for physically contiguous memory - Implemented buf_init() and buf_cleanup() to manage per-buffer state
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jserv
requested changes
Jul 1, 2025
Enable configuring vcam device memory type via user-space tool and driver. Users can now specify whether to use MMAP or DMABUF for buffer management.
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jserv
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Jul 20, 2025
| @@ -56,7 +56,7 @@ $ sudo ./vcam-util -l | |||
| You should get: | |||
| ``` | |||
| Available virtual V4L2 compatible devices: | |||
| 1. fbX(640,480,rgb24) -> /dev/video0 | |||
| 1. fbX(640,480,rgb24,mmap) -> /dev/video0 | |||
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Add note for DMA-BUF to illustrate the results.
Briefly describe DMA-BUF's purpose for cross-device buffer sharing.
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