linux-kernel - Re: [PATCH 10/11] coresight-etm4x: Controls pertaining to the context ID functions

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Date:	Thu, 23 Apr 2015 11:08:53 -0400
From:	Christopher Covington <cov@...eaurora.org>
To:	Mathieu Poirier <mathieu.poirier@...aro.org>
CC:	gregkh@...uxfoundation.org, linux-arm-kernel@...ts.infradead.org,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	kaixu.xia@...aro.org, zhang.chunyan@...aro.org
Subject: Re: [PATCH 10/11] coresight-etm4x: Controls pertaining to the
 context ID functions

Hi Mathieu,

On 04/22/2015 06:40 PM, Mathieu Poirier wrote:
> From: Pratik Patel <pratikp@...eaurora.org>
> 
> Adding sysfs entries to access and configure specifics about the
> context ID comparator functions.
> 
> Signed-off-by: Pratik Patel <pratikp@...eaurora.org>
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>  .../ABI/testing/sysfs-bus-coresight-devices-etm4x  |  19 +++
>  drivers/hwtracing/coresight/coresight-etm4x.c      | 187 +++++++++++++++++++++
>  2 files changed, 206 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
> index b5c0456290ab..8b32cb7b9723 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
> @@ -254,3 +254,22 @@ Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <mathieu.poirier@...aro.org>
>  Description: 	(RW) Controls the selection of the resources in the trace unit.
> +
> +What:		/sys/bus/coresight/devices/<memory_map>.etm/ctxid_idx
> +Date:		April 2015
> +KernelVersion:	4.01
> +Contact:	Mathieu Poirier <mathieu.poirier@...aro.org>
> +Description:	(RW) Select which context ID comparator to work with.
> +
> +What:		/sys/bus/coresight/devices/<memory_map>.etm/ctxid_val
> +Date:		April 2015
> +KernelVersion:	4.01
> +Contact:	Mathieu Poirier <mathieu.poirier@...aro.org>
> +Description:	(RW) Get/Set the context ID comparator value to trigger on.

If I'm understanding this correctly, ctxid_val is multiplexed using ctxid_idx.
Why not just have ctxid_val0, ctxid_val1, ...?

Thanks,
Chris

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Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
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