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

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Date:	Tue, 23 Feb 2016 18:27:42 +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

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