Bounce in more cases in the arm64 busdma

[andrew]

Summary

WE need to use a bounce buffer when the memory we are operating on is not
aligned to a cacheline, and not aligned to the maps alignment.

The former is to stop other threads from dirtying the cacheline while we
are performing DMA operations with it. The latter is to check memory
passed in by a driver is correctly aligned for the device.

[mmel]

sys/arm64/arm64/busdma_bounce.c

183

this should be

	if ((map->flags & (DMAMAP_FROM_DMAMEM | DMAMAP_MBUF)) != 0 ||
	    (dmat ->bounce_flags & BF_COHERENT) != 0)

(and dmat must be passed as argument to this function)

but RockPro64 still have problem...

[andrew]

• Use might_bounce/must_bounce in bounce_bus_dma_id_mapped
• Always create the bounce zone in bounce_bus_dmamap_create

[andrew]

Remove debugging

[mmel]

sys/arm64/arm64/busdma_bounce.c

229

Hmm, I forgot. The bus_dma_run_filter() is very probably wrong, or at least inconsistent. I thing that we should remove alignment condition from it.