[PATCH v3 0/3] libcamera: dma_buffer_allocator: Add support for using udmabuf to alloc dma-buffers

[Hans de Goede]

Hi All,

Here is v3 of my patch-series to add /dev/udmabuf dma-buffer allocation
support. This is based on: https://patchwork.libcamera.org/patch/18922/

Changes in v3:
- Rebase on top of latest master which includes Milan's "[PATCH v6 0/5]
  Software ISP levels cleanup" series and Laurent's "[PATCH 0/3] libcamera:
  Update to the new upstream subdev routing API" series
- Drop include/linux related patches (included in Laurent's merged series)
- Wrap comments and error message logging at 80 chars
- Style fixes to some comments
- Drop the unnecessary checking of the created dma-buf size

Changes in v2:
- New patch: Add linux/udmabuf.h to libcamera's local kernel headers
- New patch: Rename DmaHeap class to DmaBufAllocator
- libcamera: DmaBufAllocator: Support allocating from /dev/udmabuf :
  - Reword the commit message
  - Add a new DmaBufAllocator::DmaBufAllocatorFlag::UDmaBuf type for udmabuf
  - Drop unnecessary size != size check
  - Reword log messages to be more like the DMA heap alloc path
  - Move UniqueFD(ret) up so as to not leak the fd on errors
-New patch: software_isp: Allow using dma-buffers from /dev/udmabuf

I did not push out a branch for this to libcamera-softisp because
of fdo gitlab maintenance. Note CI was happy with v2 and I see no reason
why v3 would be different.

Regards,

Hans


Hans de Goede (3):
  libcamera: Rename DmaHeap class to DmaBufAllocator
  libcamera: DmaBufAllocator: Support allocating from /dev/udmabuf
  libcamera: software_isp: Allow using dma-buffers from /dev/udmabuf

 .../libcamera/internal/dma_buf_allocator.h    |  42 ++++
 include/libcamera/internal/dma_heaps.h        |  38 ---
 include/libcamera/internal/meson.build        |   2 +-
 .../internal/software_isp/software_isp.h      |   4 +-
 src/libcamera/dma_buf_allocator.cpp           | 233 ++++++++++++++++++
 src/libcamera/dma_heaps.cpp                   | 165 -------------
 src/libcamera/meson.build                     |   2 +-
 src/libcamera/pipeline/rpi/vc4/vc4.cpp        |   4 +-
 src/libcamera/software_isp/software_isp.cpp   |   6 +-
 9 files changed, 285 insertions(+), 211 deletions(-)
 create mode 100644 include/libcamera/internal/dma_buf_allocator.h
 delete mode 100644 include/libcamera/internal/dma_heaps.h
 create mode 100644 src/libcamera/dma_buf_allocator.cpp
 delete mode 100644 src/libcamera/dma_heaps.cpp

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2.45.1