2ad832fa6e
Improve the device opening at class construction time by testing all the available device paths and printout the appropriate error message. While at it, initialize dmaHeapHandle_ to -1 and check for its value at destruction time. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
97 lines
1.9 KiB
C++
97 lines
1.9 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2020, Raspberry Pi (Trading) Limited
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*
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* dma_heaps.h - Helper class for dma-heap allocations.
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*/
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#include "dma_heaps.h"
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#include <array>
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#include <fcntl.h>
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#include <linux/dma-buf.h>
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#include <linux/dma-heap.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include "libcamera/internal/log.h"
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/*
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* /dev/dma-heap/linux,cma is the dma-heap allocator, which allows dmaheap-cma
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* to only have to worry about importing.
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*
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* Annoyingly, should the cma heap size be specified on the kernel command line
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* instead of DT, the heap gets named "reserved" instead.
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*/
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static constexpr std::array<const char *, 2> heapNames = {
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"/dev/dma_heap/linux,cma",
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"/dev/dma_heap/reserved"
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};
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namespace libcamera {
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LOG_DECLARE_CATEGORY(RPI)
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namespace RPi {
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DmaHeap::DmaHeap()
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: dmaHeapHandle_(-1)
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{
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for (const char *name : heapNames) {
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int ret = ::open(name, O_RDWR, 0);
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if (ret < 0) {
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ret = errno;
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LOG(RPI, Debug) << "Failed to open " << name << ": "
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<< strerror(ret);
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continue;
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}
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dmaHeapHandle_ = ret;
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break;
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}
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if (dmaHeapHandle_ < 0)
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LOG(RPI, Error) << "Could not open any dmaHeap device";
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}
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DmaHeap::~DmaHeap()
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{
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if (dmaHeapHandle_ > -1)
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::close(dmaHeapHandle_);
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}
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FileDescriptor DmaHeap::alloc(const char *name, std::size_t size)
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{
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int ret;
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if (!name)
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return FileDescriptor();
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struct dma_heap_allocation_data alloc = {};
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alloc.len = size;
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alloc.fd_flags = O_CLOEXEC | O_RDWR;
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ret = ::ioctl(dmaHeapHandle_, DMA_HEAP_IOCTL_ALLOC, &alloc);
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if (ret < 0) {
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LOG(RPI, Error) << "dmaHeap allocation failure for "
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<< name;
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return FileDescriptor();
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}
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ret = ::ioctl(alloc.fd, DMA_BUF_SET_NAME, name);
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if (ret < 0) {
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LOG(RPI, Error) << "dmaHeap naming failure for "
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<< name;
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::close(alloc.fd);
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return FileDescriptor();
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}
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return FileDescriptor(std::move(alloc.fd));
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}
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} /* namespace RPi */
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} /* namespace libcamera */
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