linux-kernel - Re: [PATCH 10/17] coresight: Move struct coresight_trace_id

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Date: Wed, 1 May 2024 12:11:21 +0100
From: Mike Leach <mike.leach@...aro.org>
To: James Clark <james.clark@....com>
Cc: linux-perf-users@...r.kernel.org, gankulkarni@...amperecomputing.com, 
	scclevenger@...amperecomputing.com, coresight@...ts.linaro.org, 
	suzuki.poulose@....com, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
	Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>, 
	Adrian Hunter <adrian.hunter@...el.com>, John Garry <john.g.garry@...cle.com>, 
	Will Deacon <will@...nel.org>, Leo Yan <leo.yan@...ux.dev>, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH 10/17] coresight: Move struct coresight_trace_id_map to
 common header

On Mon, 29 Apr 2024 at 16:24, James Clark <james.clark@....com> wrote:
>
> The trace ID maps will need to be created and stored by the core and
> Perf code so move the definition up to the common header.
>
> Signed-off-by: James Clark <james.clark@....com>
> ---
>  .../hwtracing/coresight/coresight-trace-id.c  |  1 +
>  .../hwtracing/coresight/coresight-trace-id.h  | 19 -------------------
>  include/linux/coresight.h                     | 18 ++++++++++++++++++
>  3 files changed, 19 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-trace-id.c b/drivers/hwtracing/coresight/coresight-trace-id.c
> index af5b4ef59cea..19005b5b4dc4 100644
> --- a/drivers/hwtracing/coresight/coresight-trace-id.c
> +++ b/drivers/hwtracing/coresight/coresight-trace-id.c
> @@ -3,6 +3,7 @@
>   * Copyright (c) 2022, Linaro Limited, All rights reserved.
>   * Author: Mike Leach <mike.leach@...aro.org>
>   */
> +#include <linux/coresight.h>
>  #include <linux/coresight-pmu.h>
>  #include <linux/cpumask.h>
>  #include <linux/kernel.h>
> diff --git a/drivers/hwtracing/coresight/coresight-trace-id.h b/drivers/hwtracing/coresight/coresight-trace-id.h
> index 3797777d367e..49438a96fcc6 100644
> --- a/drivers/hwtracing/coresight/coresight-trace-id.h
> +++ b/drivers/hwtracing/coresight/coresight-trace-id.h
> @@ -32,10 +32,6 @@
>  #include <linux/bitops.h>
>  #include <linux/types.h>
>
> -
> -/* architecturally we have 128 IDs some of which are reserved */
> -#define CORESIGHT_TRACE_IDS_MAX 128
> -
>  /* ID 0 is reserved */
>  #define CORESIGHT_TRACE_ID_RES_0 0
>
> @@ -46,21 +42,6 @@
>  #define IS_VALID_CS_TRACE_ID(id)       \
>         ((id > CORESIGHT_TRACE_ID_RES_0) && (id < CORESIGHT_TRACE_ID_RES_TOP))
>
> -/**
> - * Trace ID map.
> - *
> - * @used_ids:  Bitmap to register available (bit = 0) and in use (bit = 1) IDs.
> - *             Initialised so that the reserved IDs are permanently marked as
> - *             in use.
> - * @pend_rel_ids: CPU IDs that have been released by the trace source but not
> - *               yet marked as available, to allow re-allocation to the same
> - *               CPU during a perf session.
> - */
> -struct coresight_trace_id_map {
> -       DECLARE_BITMAP(used_ids, CORESIGHT_TRACE_IDS_MAX);
> -       DECLARE_BITMAP(pend_rel_ids, CORESIGHT_TRACE_IDS_MAX);
> -};
> -
>  /* Allocate and release IDs for a single default trace ID map */
>
>  /**
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index f09ace92176e..c16c61a8411d 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -218,6 +218,24 @@ struct coresight_sysfs_link {
>         const char *target_name;
>  };
>
> +/* architecturally we have 128 IDs some of which are reserved */
> +#define CORESIGHT_TRACE_IDS_MAX 128
> +
> +/**
> + * Trace ID map.
> + *
> + * @used_ids:  Bitmap to register available (bit = 0) and in use (bit = 1) IDs.
> + *             Initialised so that the reserved IDs are permanently marked as
> + *             in use.
> + * @pend_rel_ids: CPU IDs that have been released by the trace source but not
> + *               yet marked as available, to allow re-allocation to the same
> + *               CPU during a perf session.
> + */
> +struct coresight_trace_id_map {
> +       DECLARE_BITMAP(used_ids, CORESIGHT_TRACE_IDS_MAX);
> +       DECLARE_BITMAP(pend_rel_ids, CORESIGHT_TRACE_IDS_MAX);
> +};
> +
>  /**
>   * struct coresight_device - representation of a device as used by the framework
>   * @pdata:     Platform data with device connections associated to this device.
> --
> 2.34.1
>

Reviewed-by: Mike Leach <mike.leach@...aro.org>
-- 
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK