linux-kernel - Re: [PATCH V3 14/14] coresight: etm-perf: Add support for trace buffer format

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Message-ID: <YBFiecTmjA30qRaW@hirez.programming.kicks-ass.net>
Date:   Wed, 27 Jan 2021 13:54:17 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
        mathieu.poirier@...aro.org, suzuki.poulose@....com,
        mike.leach@...aro.org, lcherian@...vell.com,
        linux-kernel@...r.kernel.org, Leo Yan <leo.yan@...aro.org>
Subject: Re: [PATCH V3 14/14] coresight: etm-perf: Add support for trace
 buffer format

On Wed, Jan 27, 2021 at 02:25:38PM +0530, Anshuman Khandual wrote:

> It is possible to have a
> perf session where some events end up collecting the trace
> in TMC-ETR while the others in TRBE. Thus we need a way
> to identify the type of the trace for each AUX record.

> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index 9a5ca45..169e6b3 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -1111,6 +1111,10 @@ enum perf_callchain_context {
>  #define PERF_AUX_FLAG_COLLISION			0x08	/* sample collided with another */
>  #define PERF_AUX_FLAG_PMU_FORMAT_TYPE_MASK	0xff00	/* PMU specific trace format type */
>  
> +/* CoreSight PMU AUX buffer formats */
> +#define PERF_AUX_FLAG_CORESIGHT_FORMAT_CORESIGHT	0x0000 /* Default for backward compatibility */
> +#define PERF_AUX_FLAG_CORESIGHT_FORMAT_RAW		0x0100 /* Raw format of the source */

Would CORESIGHT_FORMAT_ETR / CORESIGHT_FORMAT_TRBE be better names?