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

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Date:	Mon, 15 Jun 2015 16:49:50 +1000 (AEST)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Alexey Kardashevskiy <aik@...abs.ru>, linuxppc-dev@...ts.ozlabs.org
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	David Gibson <david@...son.dropbear.id.au>
Subject: 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 <gwshan@...ux.vnet.ibm.com>
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>

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
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