staging: android: ion: potential coherency issue

Alexey Skidanov alexey.skidanov at intel.com
Tue Feb 13 07:24:32 UTC 2018


Hello,

Correct me if I'm wrong, but there is no user space interface, similar
to the dma_buf_start_cpu_access()/dma_buf_end_cpu_access() to handle IO
coherency. That is, on the platforms, where the SW is responsible for IO
coherency handling, the following sequences:
- write to the buffer
- DMA read
or
- DMA write
- read from the buffer
may be problematic.

Thanks,
Alexey


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