dma: passing "attributes" to dma_map_* routines
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- v1 Latest3 patches 17 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/3 | dma: create linux/dma-direction.hinclude/ include/ | +54 | 2 replies | |
| 2/3 | dma: ia64/sn2 allow "attributes" to be used by dma_map_*arch/ include/ lib/ | +44 | 0 replies | |
| 3/3 | dma: x86_64 allow "attributes" to be used by dma_map_*arch/ arch/ arch/ +3 more | +55 | 1 reply |
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Cover letter [RFC/PARTIAL PATCH 0/3] dma: passing "attributes" to dma_map_* routines
The following patchset allows additional "attributes" to be passed to dma_map_*/dma_unmap_* implementations. (The reason why this is useful/necessary has been mentioned several times, most recently here:
http://marc.info/?l=linux-kernel&m=119258541412724&w=2.)
This is incomplete in that only ia64 and x86_64 are supported - the purpose is mainly to give us something specific to discuss.
The approach here is to change the dma_map_* interface so that the last argument is an u32 which encodes the direction of the dma and, optionally, other attributes. Changing the interface is a bit intrusive, but callers of dma_map_* don't need to be modified.
There are 3 patches:
[1/3] dma: create linux/dma-direction.h
[2/3] dma: ia64/sn2 allow "attributes" to be used by dma_map_* [2/3] dma: x86_64 allow "attributes" to be used by dma_map_*
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