linux-kernel - Re: [PATCH V4 0/6] perf/amd/iommu: Enable multi-IOMMU support

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Message-ID: <56CC44D8.4080604@amd.com>
Date:	Tue, 23 Feb 2016 18:39:04 +0700
From:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:	Joerg Roedel <joro@...tes.org>
CC:	<bp@...en8.de>, <peterz@...radead.org>, <mingo@...hat.com>,
	<acme@...nel.org>, <andihartmann@...enet.de>,
	<linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>
Subject: Re: [PATCH V4 0/6] perf/amd/iommu: Enable multi-IOMMU support



On 02/23/2016 06:27 PM, Suravee Suthikulpanit wrote:
> Hi,
>
> On 02/23/2016 06:04 PM, Joerg Roedel wrote:
>> Hi Suravee,
>>
>> On Thu, Feb 11, 2016 at 04:15:21PM +0700, Suthikulpanit, Suravee wrote:
>>> From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
>>>
>>> This patch series modifies the existing perf_event_amd_iommu driver
>>> to support systems with multiple IOMMUs. It introduces new AMD IOMMU
>>> APIs,
>>> which are used by the AMD IOMMU Perf driver to access performance
>>> counters in multiple IOMMUs.
>>>
>>> In addition, this series should also fix current AMD IOMMU PMU driver
>>> initialization issue in some existing KV and CZ platform, where it fails
>>> to write to IOMMU perf counter as reported by Andreas Hartmann here
>>> (http://comments.gmane.org/gmane.linux.kernel.pci/49147).
>>
>> Since that problem also affects older kernels, we need a stand-alone
>> fix for this initialization issue. We can't backport new features to fix
>> bugs in old kernels.
>>
>>
>>     Joerg
>>
>
> OK, I am spliting V5 into two part. First would be just to fix the
> issue. Then the second part would be to add the multiple IOMMU support.
>
> Suravee

Actually, my V5 is rebased from tips which has moved several files. I 
think we might need to create a separate patch series to fix this issue 
in older kernels. Which branch should I rebase my changes for the older 
kernel?

Suravee