s390/cio: introduce bitwise dma types and helper functions

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Introduce dma32_t and dma64_t bitwise types, which are supposed to be used
for 31 and 64 bit DMA capable addresses. This allows to use sparse (make
C=1) for type checking, so that incorrect usages can be easily found.

Also add a couple of helper functions which
- convert virtual to DMA addresses and vice versa
- allow for simple logical and arithmetic operations on DMA addresses
- convert DMA addresses to plain u32 and u64 values

All helper functions exist to avoid excessive casting in C code.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Co-developed-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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Halil Pasic 2024-03-07 13:28:05 +01:00 • committed by Heiko Carstens

parent 1c2be70e65

commit 8b19e145e8

1 changed files with 103 additions and 0 deletions

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arch/s390/include/asm/dma-types.h

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