powerpc/pseries: EOI interrupts in XICS by setting lowest priority
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Authored by jhibbits on Sep 30 2018, 2:06 AM.

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rS339215: powerpc/pseries: EOI interrupts in XICS by setting lowest priority

Summary

Discussing with Benjamin Herrenschmidt, OPAL_INT_GET_XIRR masks the
returned priority, so must be resumed before more interrupts can be
handled at this priority. Since there are only two priorities used in
FreeBSD, we know that the previous priority in an EOI will always be
0xff (lowest priority).