On Tue, Mar 16, 2021 at 06:03:56PM +0000, Mike Leach wrote:
> Add calls to activate the selected configuration as perf starts
> and stops the tracing session.
>
> Signed-off-by: Mike Leach <mike.le...@linaro.org>
> Reviewed-by: Suzuki K Poulose <suzuki.poul...@arm.com>
Reviewed-by: Mathieu Poirier <mathieu.poir...@linaro.org>
> ---
> drivers/hwtracing/coresight/coresight-etm-perf.c | 14 +++++++++++++-
> drivers/hwtracing/coresight/coresight-etm-perf.h | 2 ++
> 2 files changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c
> b/drivers/hwtracing/coresight/coresight-etm-perf.c
> index 66bda452a2f4..9128f59864a8 100644
> --- a/drivers/hwtracing/coresight/coresight-etm-perf.c
> +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
> @@ -196,6 +196,10 @@ static void free_event_data(struct work_struct *work)
> /* Free the sink buffers, if there are any */
> free_sink_buffer(event_data);
>
> + /* clear any configuration we were using */
> + if (event_data->cfg_hash)
> + cscfg_deactivate_config(event_data->cfg_hash);
> +
> for_each_cpu(cpu, mask) {
> struct list_head **ppath;
>
> @@ -254,7 +258,7 @@ static void etm_free_aux(void *data)
> static void *etm_setup_aux(struct perf_event *event, void **pages,
> int nr_pages, bool overwrite)
> {
> - u32 id;
> + u32 id, cfg_hash;
> int cpu = event->cpu;
> cpumask_t *mask;
> struct coresight_device *sink = NULL;
> @@ -271,6 +275,14 @@ static void *etm_setup_aux(struct perf_event *event,
> void **pages,
> sink = coresight_get_sink_by_id(id);
> }
>
> + /* check if user wants a coresight configuration selected */
> + cfg_hash = (u32)((event->attr.config2 & GENMASK_ULL(63, 32)) >> 32);
> + if (cfg_hash) {
> + if (cscfg_activate_config(cfg_hash))
> + goto err;
> + event_data->cfg_hash = cfg_hash;
> + }
> +
> mask = &event_data->mask;
>
> /*
> diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.h
> b/drivers/hwtracing/coresight/coresight-etm-perf.h
> index ba617fe2217e..468f7799ab4f 100644
> --- a/drivers/hwtracing/coresight/coresight-etm-perf.h
> +++ b/drivers/hwtracing/coresight/coresight-etm-perf.h
> @@ -49,12 +49,14 @@ struct etm_filters {
> * @work: Handle to free allocated memory outside IRQ context.
> * @mask: Hold the CPU(s) this event was set for.
> * @snk_config: The sink configuration.
> + * @cfg_hash: The hash id of any coresight config selected.
> * @path: An array of path, each slot for one CPU.
> */
> struct etm_event_data {
> struct work_struct work;
> cpumask_t mask;
> void *snk_config;
> + u32 cfg_hash;
> struct list_head * __percpu *path;
> };
>
> --
> 2.17.1
>
