DMM shall be initialized as early as possible to allow drivers to
use it. For example, uart may need it early since it starts
RX during initilization in some configurations.
Making dmm_init() public and calling it in soc init function.
Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
Getting the required alignment size for memory region node
and device node needs to be handled by a separate macro.
Otherwise alignment of single byte is reported for any region.
Add a test that checks for this particular issue.
Signed-off-by: Nikodem Kastelik <nikodem.kastelik@nordicsemi.no>
DMM was enforcing cache line alignment all memory regions, including
those which were not cacheable. Fixing it by using memory attribute
from the device tree to determine if alignment needs to be applied.
Because of that memory usage was significantly increased because
even 1 byte buffers (e.g. for uart_poll_out) was consuming 32 bytes
(cache line size).
Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
DMM stands for Device Memory Management and its role is to streamline
the process of allocating DMA buffer in correct memory region
and managing the data cache.
Signed-off-by: Nikodem Kastelik <nikodem.kastelik@nordicsemi.no>
Krzysztof Chruściński