Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) # SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
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^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) =====================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) dma-buf-test-exporter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) =====================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) Overview
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) --------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) The dma-buf-test-exporter is a simple exporter of dma_buf objects.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) It has a private API to allocate and manipulate the buffers which are represented as dma_buf fds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) The private API allows:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * simple allocation of physically non-contiguous buffers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * simple allocation of physically contiguous buffers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * query kernel side API usage stats (number of attachments, number of mappings, mmaps)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * failure mode configuration (fail attach, mapping, mmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * kernel side memset of buffers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) The buffers support all of the dma_buf API, including mmap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) It supports being compiled as a module both in-tree and out-of-tree.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) See include/linux/dma-buf-test-exporter.h for the ioctl interface.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) See Documentation/dma-buf-sharing.txt for details on dma_buf.