[RFCv2 0/2] dma-parms, constraints and helpers for dma-buf
Sumit Semwal
sumit.semwal at linaro.org
Tue Jan 20 20:16:45 PST 2015
Hello Everyone,
Based on review comments received, I've split my earlier patchset on
'dma-buf constraints-enabled allocation' [1] into 2 sets:
- first one is this one, to use dma_parms and related parameters from
struct device to share constraints, and then to use these constraints in
dma-buf to help find the least common constraint set that could then be
used by exporters to decide on allocation.
This is a partial re-write of what Rob Clark proposed some while ago [2];
I've tried to take care of review comments on his patchset, but any errors
and omissions are, ofcourse, mine.
- Second part, one which I'm working on, and will post soon, aims at adding
allocator-helpers in dma-buf framework which could use this constraint
information to help choose the right allocator from a list.
While I work on the second part, I thought of sending the RFC for this one,
to get feedback on whether this mechanism seems ok to everyone.
[1] https://lkml.org/lkml/2014/10/10/340
[2] https://lkml.org/lkml/2012/7/19/285
Rob Clark (1):
device: add dma_params->max_segment_count
Sumit Semwal (1):
dma-buf: add helpers for sharing attacher constraints with dma-parms
drivers/dma-buf/dma-buf.c | 134 +++++++++++++++++++++++++++++++++++++++++++-
include/linux/device.h | 1 +
include/linux/dma-buf.h | 22 ++++++++
include/linux/dma-mapping.h | 19 +++++++
4 files changed, 175 insertions(+), 1 deletion(-)
--
1.9.1
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