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Diffstat (limited to 'driver/product/kernel/Documentation/dma-buf-test-exporter.txt')
| -rwxr-xr-x | driver/product/kernel/Documentation/dma-buf-test-exporter.txt | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/driver/product/kernel/Documentation/dma-buf-test-exporter.txt b/driver/product/kernel/Documentation/dma-buf-test-exporter.txt new file mode 100755 index 0000000..4208010 --- /dev/null +++ b/driver/product/kernel/Documentation/dma-buf-test-exporter.txt @@ -0,0 +1,40 @@ +# +# (C) COPYRIGHT 2012-2013 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 licence. +# +# A copy of the licence is included with the program, and can also be obtained +# from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +# Boston, MA 02110-1301, USA. +# +# + + + +===================== +dma-buf-test-exporter +===================== + +Overview +-------- + +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. + + |