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Re: port-arm/55737 (Apparent bug in evbarm64 DMA code causes filesystem corruption)

Synopsis: Apparent bug in evbarm64 DMA code causes filesystem corruption

State-Changed-From-To: open->closed
State-Changed-When: Sun, 15 May 2022 20:28:51 +0000
the virtio bug was fixed and the bounce bbuffer bug 
was evry likely fixed in

if we have to bounce a buffer, clear our anything already setup in
the map before trying again.

riastradh@ noticed that a map had two types of mbuf types, and this
seems to avoid it as seen on eqos(4) on quartz64.

add a couple more event counts for bus dma events.

ok @skrll @raistradh @jmcneill

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