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libcamera: DmaBufAllocator: Support allocating from /dev/udmabuf

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The dma-buf allocator currently allocates from CMA and system heaps.

Extend the dma-buf allocator to support allocating dma-buffers by creating
memfd-s and turning those into dma-buffers using /dev/udmabuf.

The buffers allocated through memfd/udmabuf are not suitable for zero-copy
buffer sharing with other devices.

Co-developed-by: Harvey Yang <chenghaoyang@chromium.org>
Signed-off-by: Harvey Yang <chenghaoyang@chromium.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> # Lenovo-x13s
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Hans de Goede 2024-06-03 13:12:58 +02:00 • committed by Kieran Bingham
parent 447da4a11f
commit ea4baaacc3
2 changed files with 90 additions and 15 deletions
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4
include/libcamera/internal/dma_buf_allocator.h
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@ -20,6 +20,7 @@ public:
enum class DmaBufAllocatorFlag {
CmaHeap = 1 << 0,
SystemHeap = 1 << 1,
UDmaBuf = 1 << 2,
};
using DmaBufAllocatorFlags = Flags<DmaBufAllocatorFlag>;
@ -30,7 +31,10 @@ public:
UniqueFD alloc(const char *name, std::size_t size);
private:
UniqueFD allocFromHeap(const char *name, std::size_t size);
UniqueFD allocFromUDmaBuf(const char *name, std::size_t size);
UniqueFD providerHandle_;
DmaBufAllocatorFlag type_;
};
LIBCAMERA_FLAGS_ENABLE_OPERATORS(DmaBufAllocator::DmaBufAllocatorFlag)