From: Michael Ellerman <mpe@ellerman.id.au>
To: Alexey Kardashevskiy <aik@ozlabs.ru>, linuxppc-dev@lists.ozlabs.org
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>,
Gavin Shan <gwshan@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [kernel] powerpc/powernv/ioda2: Add devices only from buses which belong to PE
Date: Mon, 15 Jun 2015 16:49:50 +1000 (AEST) [thread overview]
Message-ID: <20150615064950.7C42514029E@ozlabs.org> (raw)
In-Reply-To: <1434089957-27135-1-git-send-email-aik@ozlabs.ru>
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@linux.vnet.ibm.com>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.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
prev parent reply other threads:[~2015-06-15 6:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-12 6:19 [PATCH kernel] powerpc/powernv/ioda2: Add devices only from buses which belong to PE Alexey Kardashevskiy
2015-06-12 6:47 ` Gavin Shan
2015-06-12 15:06 ` Nishanth Aravamudan
2015-06-12 16:47 ` Alexey Kardashevskiy
2015-06-15 0:11 ` Gavin Shan
2015-06-15 6:49 ` Michael Ellerman [this message]
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