Re: [PATCH V2 14/15] coresight: tmc: implementing TMC-ETR AUX space API

From	Suzuki K Poulose <Suzuki.Poulose@arm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH V2 14/15] coresight: tmc: implementing TMC-ETR AUX space API
Date	2016-04-21 18:20 +0200
Message-ID	<rqpuG-3tV-9@gated-at.bofh.it> (permalink)
References	<rnaLv-2Vr-3@gated-at.bofh.it> <rnaLw-2Vr-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 12/04/16 18:54, Mathieu Poirier wrote:
> This patch implement the AUX area interfaces required to
> use the TMC (configured as an ETR) from the Perf sub-system.
>
> The heuristic is heavily borrowed from the ETB10 and TMC-ETF
> implementation.
>
> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

> +static void tmc_update_etr_buffer(struct coresight_device *csdev,
> +				  struct perf_output_handle *handle,
> +				  void *sink_config)
> +{
> +	struct cs_etr_buffers *buf = sink_config;
> +
> +	/*
> +	 * An ETR configured to work in contiguous memory mode works the same
> +	 * was as an ETB or ETF.
> +	 */
> +	tmc_update_etf_buffer(csdev, handle, &buf->tmc);

Really ? I thought the ETR stores the data to the allocated System RAM and can
be read directly from the memory than using the RRD ?

Suzuki

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Re: [PATCH V2 14/15] coresight: tmc: implementing TMC-ETR AUX space  API Suzuki K Poulose <Suzuki.Poulose@arm.com> - 2016-04-21 18:20 +0200
  Re: [PATCH V2 14/15] coresight: tmc: implementing TMC-ETR AUX space API Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-04-22 00:10 +0200

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