Re: [PATCH v5 12/17] coresight: Expose map arguments in trace ID API

[Mike Leach]

On Fri, 12 Jul 2024 at 11:23, James Clark <james.clark@xxxxxxxxxx> wrote:
>
> From: James Clark <james.clark@xxxxxxx>
>
> The trace ID API is currently hard coded to always use the global map.
> Add public versions that allow the map to be passed in so that Perf
> mode can use per-sink maps. Keep the non-map versions so that sysfs
> mode can continue to use the default global map.
>
> System ID functions are unchanged because they will always use the
> default map.
>
> Signed-off-by: James Clark <james.clark@xxxxxxx>
> Signed-off-by: James Clark <james.clark@xxxxxxxxxx>
> ---
>  .../hwtracing/coresight/coresight-trace-id.c  | 36 ++++++++++++++-----
>  .../hwtracing/coresight/coresight-trace-id.h  | 20 +++++++++--
>  2 files changed, 45 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-trace-id.c b/drivers/hwtracing/coresight/coresight-trace-id.c
> index 19005b5b4dc4..5561989a03fa 100644
> --- a/drivers/hwtracing/coresight/coresight-trace-id.c
> +++ b/drivers/hwtracing/coresight/coresight-trace-id.c
> @@ -12,7 +12,7 @@
>
>  #include "coresight-trace-id.h"
>
> -/* Default trace ID map. Used on systems that don't require per sink mappings */
> +/* Default trace ID map. Used in sysfs mode and for system sources */
>  static struct coresight_trace_id_map id_map_default;
>
>  /* maintain a record of the mapping of IDs and pending releases per cpu */
> @@ -47,7 +47,7 @@ static void coresight_trace_id_dump_table(struct coresight_trace_id_map *id_map,
>  #endif
>
>  /* unlocked read of current trace ID value for given CPU */
> -static int _coresight_trace_id_read_cpu_id(int cpu)
> +static int _coresight_trace_id_read_cpu_id(int cpu, struct coresight_trace_id_map *id_map)
>  {
>         return atomic_read(&per_cpu(cpu_id, cpu));
>  }
> @@ -152,7 +152,7 @@ static void coresight_trace_id_release_all_pending(void)
>         DUMP_ID_MAP(id_map);
>  }
>
> -static int coresight_trace_id_map_get_cpu_id(int cpu, struct coresight_trace_id_map *id_map)
> +static int _coresight_trace_id_get_cpu_id(int cpu, struct coresight_trace_id_map *id_map)
>  {
>         unsigned long flags;
>         int id;
> @@ -160,7 +160,7 @@ static int coresight_trace_id_map_get_cpu_id(int cpu, struct coresight_trace_id_
>         spin_lock_irqsave(&id_map_lock, flags);
>
>         /* check for existing allocation for this CPU */
> -       id = _coresight_trace_id_read_cpu_id(cpu);
> +       id = _coresight_trace_id_read_cpu_id(cpu, id_map);
>         if (id)
>                 goto get_cpu_id_clr_pend;
>
> @@ -196,13 +196,13 @@ static int coresight_trace_id_map_get_cpu_id(int cpu, struct coresight_trace_id_
>         return id;
>  }
>
> -static void coresight_trace_id_map_put_cpu_id(int cpu, struct coresight_trace_id_map *id_map)
> +static void _coresight_trace_id_put_cpu_id(int cpu, struct coresight_trace_id_map *id_map)
>  {
>         unsigned long flags;
>         int id;
>
>         /* check for existing allocation for this CPU */
> -       id = _coresight_trace_id_read_cpu_id(cpu);
> +       id = _coresight_trace_id_read_cpu_id(cpu, id_map);
>         if (!id)
>                 return;
>
> @@ -254,22 +254,40 @@ static void coresight_trace_id_map_put_system_id(struct coresight_trace_id_map *
>
>  int coresight_trace_id_get_cpu_id(int cpu)
>  {
> -       return coresight_trace_id_map_get_cpu_id(cpu, &id_map_default);
> +       return _coresight_trace_id_get_cpu_id(cpu, &id_map_default);
>  }
>  EXPORT_SYMBOL_GPL(coresight_trace_id_get_cpu_id);
>
> +int coresight_trace_id_get_cpu_id_map(int cpu, struct coresight_trace_id_map *id_map)
> +{
> +       return _coresight_trace_id_get_cpu_id(cpu, id_map);
> +}
> +EXPORT_SYMBOL_GPL(coresight_trace_id_get_cpu_id_map);
> +
>  void coresight_trace_id_put_cpu_id(int cpu)
>  {
> -       coresight_trace_id_map_put_cpu_id(cpu, &id_map_default);
> +       _coresight_trace_id_put_cpu_id(cpu, &id_map_default);
>  }
>  EXPORT_SYMBOL_GPL(coresight_trace_id_put_cpu_id);
>
> +void coresight_trace_id_put_cpu_id_map(int cpu, struct coresight_trace_id_map *id_map)
> +{
> +       _coresight_trace_id_put_cpu_id(cpu, id_map);
> +}
> +EXPORT_SYMBOL_GPL(coresight_trace_id_put_cpu_id_map);
> +
>  int coresight_trace_id_read_cpu_id(int cpu)
>  {
> -       return _coresight_trace_id_read_cpu_id(cpu);
> +       return _coresight_trace_id_read_cpu_id(cpu, &id_map_default);
>  }
>  EXPORT_SYMBOL_GPL(coresight_trace_id_read_cpu_id);
>
> +int coresight_trace_id_read_cpu_id_map(int cpu, struct coresight_trace_id_map *id_map)
> +{
> +       return _coresight_trace_id_read_cpu_id(cpu, id_map);
> +}
> +EXPORT_SYMBOL_GPL(coresight_trace_id_read_cpu_id_map);
> +
>  int coresight_trace_id_get_system_id(void)
>  {
>         return coresight_trace_id_map_get_system_id(&id_map_default);
> diff --git a/drivers/hwtracing/coresight/coresight-trace-id.h b/drivers/hwtracing/coresight/coresight-trace-id.h
> index 49438a96fcc6..840babdd0794 100644
> --- a/drivers/hwtracing/coresight/coresight-trace-id.h
> +++ b/drivers/hwtracing/coresight/coresight-trace-id.h
> @@ -42,8 +42,6 @@
>  #define IS_VALID_CS_TRACE_ID(id)       \
>         ((id > CORESIGHT_TRACE_ID_RES_0) && (id < CORESIGHT_TRACE_ID_RES_TOP))
>
> -/* Allocate and release IDs for a single default trace ID map */
> -
>  /**
>   * Read and optionally allocate a CoreSight trace ID and associate with a CPU.
>   *
> @@ -59,6 +57,12 @@
>   */
>  int coresight_trace_id_get_cpu_id(int cpu);
>
> +/**
> + * Version of coresight_trace_id_get_cpu_id() that allows the ID map to operate
> + * on to be provided.
> + */
> +int coresight_trace_id_get_cpu_id_map(int cpu, struct coresight_trace_id_map *id_map);
> +
>  /**
>   * Release an allocated trace ID associated with the CPU.
>   *
> @@ -72,6 +76,12 @@ int coresight_trace_id_get_cpu_id(int cpu);
>   */
>  void coresight_trace_id_put_cpu_id(int cpu);
>
> +/**
> + * Version of coresight_trace_id_put_cpu_id() that allows the ID map to operate
> + * on to be provided.
> + */
> +void coresight_trace_id_put_cpu_id_map(int cpu, struct coresight_trace_id_map *id_map);
> +
>  /**
>   * Read the current allocated CoreSight Trace ID value for the CPU.
>   *
> @@ -92,6 +102,12 @@ void coresight_trace_id_put_cpu_id(int cpu);
>   */
>  int coresight_trace_id_read_cpu_id(int cpu);
>
> +/**
> + * Version of coresight_trace_id_read_cpu_id() that allows the ID map to operate
> + * on to be provided.
> + */
> +int coresight_trace_id_read_cpu_id_map(int cpu, struct coresight_trace_id_map *id_map);
> +
>  /**
>   * Allocate a CoreSight trace ID for a system component.
>   *
> --
> 2.34.1
>

Reviewed-by: Mike Leach <mike.leach@xxxxxxxxxx>

--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK