On 11.05.2018 09:59, Christoph Hellwig wrote:
this series continues consolidating the dma-mapping code, with a focus
on architectures that do not (always) provide cache coherence for DMA.
Three architectures (arm, mips and powerpc) are still left to be
converted later due to complexity of their dma ops selection.
The dma-noncoherent ops calls the dma-direct ops for the actual
translation of streaming mappins and allow the architecture to provide
any cache flushing required for cpu to device and/or device to cpu
ownership transfers. The dma coherent allocator is for now still left
entirely to architecture supplied implementations due the amount of
variations. Hopefully we can do some consolidation for them later on
as well.
A lot of architectures are currently doing very questionable things
in their dma mapping routines, which are documented in the changelogs
for each patch. Please review them very careful and correct me on
incorrect assumptions.
Because this series sits on top of two previously submitted series
a git tree might be useful to actually test it. It is provided here:
git://git.infradead.org/users/hch/misc.git generic-dma-noncoherent
Gitweb:
http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/generic-dma-noncoherent
Changes since RFC:
- fix a typo accidentally disabling the device to cpu transfer sync
- fixed a few compile failures
I tested it again on parisc (this time again on top of git head) and it still breaks
the same way as I reported in my mail on April 21st: the lasi82956 network driver works
unreliable. NIC gets IP, but ping doesn't work.
See drivers/net/ethernet/i825xx/lasi_82596.c, it uses dma*sync() functions.
See comment in James mail from April 21st too:
-> you just made every 32 bit parisc system unnecessarily use non-coherent.
Helge
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