linux-kernel - Re: [PATCH v2] iommu: Add event tracing feature to iommu

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Date:	Wed, 14 Aug 2013 10:06:08 -0600
From:	Shuah Khan <shuah.kh@...sung.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	alex.williamson@...hat.com, Varun.Sethi@...escale.com,
	aik@...abs.ru, joe@...ches.com, rostedt@...dmis.org,
	fweisbec@...il.com, mingo@...hat.com, tony@...mide.com,
	ohad@...ery.com, andreas.herrmann@...xeda.com, will.deacon@....com,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	shuahkhan@...il.com, Shuah Khan <shuah.kh@...sung.com>
Subject: Re: [PATCH v2] iommu: Add event tracing feature to iommu

Hi Joerg,

Thanks for the feedback.

On 08/14/2013 08:17 AM, Joerg Roedel wrote:
> Hi Shuah,
>
> thanks for doing this. I have a few suggestions for improvements.
>
> On Tue, Jul 30, 2013 at 08:57:09AM -0600, Shuah Khan wrote:
>> iommu:add_device_to_group
>> iommu:remove_device_from_group
>> iommu:attach_device_to_domain
>> iommu:detach_device_from_domain
>> iommu:unmap
>> iommu:map
>
> Please send these events as seperate patches.

Is this what you have in mind or does my original patch set minus the 
amd_event and drivers/iommu/amd_iommu.c change?

Patch 1:
drivers/iommu/Makefile
drivers/iommu/iommu-traces.c
include/trace/events/iommu.h

One patch for each of the following events?

iommu:add_device_to_group
iommu:remove_device_from_group
iommu:attach_device_to_domain
iommu:detach_device_from_domain
iommu:unmap
iommu:map

>
>> iommu:amd_event
>
> This needs some more thought. For now I would prefer an event in the
> generic report_iommu_fault() routine to report page-faults from all IOMMUs
> that support this.
>

I see what you are saying. Adding event to report_iommu_fault() would 
cover all IOMMUs. I would like to work on adding an event unless you 
already have it in works.

-- Shuah


Shuah Khan
Sr. Linux Kernel Developer
Open Source Group
Samsung Research America(Silicon Valley)
shuah.kh@...sung.com | (970) 672-0658
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