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

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Message-ID: <20160223110406.GA22747@8bytes.org>
Date:	Tue, 23 Feb 2016 12:04:06 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
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 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