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# SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
# (C) COPYRIGHT 2012-2013, 2020-2021 ARM Limited. All rights reserved.
# This program is free software and is provided to you under the terms of the
# GNU General Public License version 2 as published by the Free Software
# Foundation, and any use by you of this program is subject to the terms
# of such GNU license.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, you can access it online at
The dma-buf-test-exporter is a simple exporter of dma_buf objects.
It has a private API to allocate and manipulate the buffers which are represented as dma_buf fds.
The private API allows:
* simple allocation of physically non-contiguous buffers
* simple allocation of physically contiguous buffers
* query kernel side API usage stats (number of attachments, number of mappings, mmaps)
* failure mode configuration (fail attach, mapping, mmap)
* kernel side memset of buffers
The buffers support all of the dma_buf API, including mmap.
It supports being compiled as a module both in-tree and out-of-tree.
See include/linux/dma-buf-test-exporter.h for the ioctl interface.
See Documentation/dma-buf-sharing.txt for details on dma_buf.