/* SPDX-License-Identifier: LGPL-2.1-or-later */ /* * Copyright (C) 2020, Raspberry Pi (Trading) Limited * * dma_heaps.h - Helper class for dma-heap allocations. */ #include "dma_heaps.h" #include #include #include #include #include #include #include "libcamera/internal/log.h" /* * /dev/dma-heap/linux,cma is the dma-heap allocator, which allows dmaheap-cma * to only have to worry about importing. * * Annoyingly, should the cma heap size be specified on the kernel command line * instead of DT, the heap gets named "reserved" instead. */ static constexpr std::array heapNames = { "/dev/dma_heap/linux,cma", "/dev/dma_heap/reserved" }; namespace libcamera { LOG_DECLARE_CATEGORY(RPI) namespace RPi { DmaHeap::DmaHeap() : dmaHeapHandle_(-1) { for (const char *name : heapNames) { int ret = ::open(name, O_RDWR, 0); if (ret < 0) { ret = errno; LOG(RPI, Debug) << "Failed to open " << name << ": " << strerror(ret); continue; } dmaHeapHandle_ = ret; break; } if (dmaHeapHandle_ < 0) LOG(RPI, Error) << "Could not open any dmaHeap device"; } DmaHeap::~DmaHeap() { if (dmaHeapHandle_ > -1) ::close(dmaHeapHandle_); } FileDescriptor DmaHeap::alloc(const char *name, std::size_t size) { int ret; if (!name) return FileDescriptor(); struct dma_heap_allocation_data alloc = {}; alloc.len = size; alloc.fd_flags = O_CLOEXEC | O_RDWR; ret = ::ioctl(dmaHeapHandle_, DMA_HEAP_IOCTL_ALLOC, &alloc); if (ret < 0) { LOG(RPI, Error) << "dmaHeap allocation failure for " << name; return FileDescriptor(); } ret = ::ioctl(alloc.fd, DMA_BUF_SET_NAME, name); if (ret < 0) { LOG(RPI, Error) << "dmaHeap naming failure for " << name; ::close(alloc.fd); return FileDescriptor(); } return FileDescriptor(std::move(alloc.fd)); } } /* namespace RPi */ } /* namespace libcamera */ on> Jacopo Mondi's clone of libcameragit repository hosting on libcamera.org

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