Re: [kernel] powerpc/powernv/ioda2: Add devices only from buses which belong to PE

On Fri, 2015-12-06 at 06:19:17 UTC, Alexey Kardashevskiy wrote:

The existing code puts all devices from a root PE to the same IOMMU group.
However it is a possible situation when subordinate buses belong to
separate PEs, in this case devices from these subordinate buses
should be added to lower level PE rather to the root PE.

This limits pnv_ioda_setup_bus_dma() invocation to only PEs which own
all subordinate buses.

Suggested-by: Gavin Shan <redacted>
Signed-off-by: Alexey Kardashevskiy <redacted>

Alexey/Gavin, can one of you write a better changelog for this. Explaining
what exactly is broken without it, how it fixes the problem, and why that is
the right fix.

cheers