ea4baaacc3
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>
43 lines
970 B
C++
43 lines
970 B
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2020, Raspberry Pi Ltd
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*
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* Helper class for dma-buf allocations.
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*/
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#pragma once
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#include <stddef.h>
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#include <libcamera/base/flags.h>
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#include <libcamera/base/unique_fd.h>
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namespace libcamera {
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class DmaBufAllocator
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{
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public:
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enum class DmaBufAllocatorFlag {
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CmaHeap = 1 << 0,
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SystemHeap = 1 << 1,
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UDmaBuf = 1 << 2,
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};
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using DmaBufAllocatorFlags = Flags<DmaBufAllocatorFlag>;
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DmaBufAllocator(DmaBufAllocatorFlags flags = DmaBufAllocatorFlag::CmaHeap);
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~DmaBufAllocator();
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bool isValid() const { return providerHandle_.isValid(); }
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UniqueFD alloc(const char *name, std::size_t size);
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private:
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UniqueFD allocFromHeap(const char *name, std::size_t size);
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UniqueFD allocFromUDmaBuf(const char *name, std::size_t size);
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UniqueFD providerHandle_;
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DmaBufAllocatorFlag type_;
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};
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LIBCAMERA_FLAGS_ENABLE_OPERATORS(DmaBufAllocator::DmaBufAllocatorFlag)
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} /* namespace libcamera */
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