linux-kernel - RE: [PATCH 1/1] iommuv2/amd: Enable Performance Counters On Family 15h Models 10h-1Fh

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Date:	Sun, 2 Dec 2012 21:55:09 +0000
From:	"Kinney, Steven" <Steven.Kinney@....com>
To:	Joerg Roedel <joro@...tes.org>
CC:	Joerg Roedel <bhelgaas@...gle.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Jiri Kosina <jkosina@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"Hurwitz, Sherry" <sherry.hurwitz@....com>
Subject: RE: [PATCH 1/1] iommuv2/amd: Enable Performance Counters On Family
 15h Models 10h-1Fh

Hi Joerg,

                  I didn't want to expose the internals of the IOMMU, so I decided to export the function(s) so that the perf IOMMUv2 PMU can make call(s) into the IOMMU core to request PC resources.  The perf_event_amd_iommuv2.h defines the prototype for the added PC functionality.  I have the perf IOMMUv2 PMU working and counting IOMMUv2 PC events using this interface, but if  you have a suggestion to make this implementation more robust, I will accommodate the suggestion.  Also, if it would be helpful, I can submit the perf IOMMUv2 PMU patches.  

BTW, I am resubmitting this patch since I caught a function signature error; was changing the code based on Boris's suggestion(s) and forgot to add the variable type (bool) concerning the 'is_write' parameter.

Hope all is well with you and the team; we miss you guys!

Regards,

Steve

-----Original Message-----
From: Joerg Roedel [mailto:joro@...tes.org] 
Sent: Sunday, December 02, 2012 7:30 AM
To: Kinney, Steven
Cc: Joerg Roedel; Kukjin Kim; Stephen Warren; Jiri Kosina; linux-kernel@...r.kernel.org; iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 1/1] iommuv2/amd: Enable Performance Counters On Family 15h Models 10h-1Fh

On Mon, Nov 26, 2012 at 04:00:25PM -0600, Steven Kinney wrote:
> From: "Steven L. Kinney" <steven.kinney@....com>
> 
> Add Kernel configuration selection for AMD IOMMUv2 performance 
> counters.

How can the counters be used?


	Joerg




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