linux-kernel - [PATCH v4 06/10] coresight: etm-perf: Update to activate selected configuration

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Message-Id: <20210128170936.9222-7-mike.leach@linaro.org>
Date:   Thu, 28 Jan 2021 17:09:32 +0000
From:   Mike Leach <mike.leach@...aro.org>
To:     linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
        mathieu.poirier@...aro.org, linux-doc@...r.kernel.org,
        suzuki.poulose@....com
Cc:     yabinc@...gle.com, corbet@....net, leo.yan@...aro.org,
        alexander.shishkin@...ux.intel.com, tingwei@...eaurora.org,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        Mike Leach <mike.leach@...aro.org>
Subject: [PATCH v4 06/10] coresight: etm-perf: Update to activate selected configuration

Add calls to activate the selected configuration as perf starts
and stops the tracing session.

Signed-off-by: Mike Leach <mike.leach@...aro.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 e270bb1e0f7d..5c1aeddabc59 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.c
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
@@ -178,6 +178,10 @@ 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->config_id_hash)
+		cscfg_deactivate_config(event_data->config_id_hash);
+
 	for_each_cpu(cpu, mask) {
 		struct list_head **ppath;
 
@@ -236,7 +240,7 @@ 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, config_id;
 	int cpu = event->cpu;
 	cpumask_t *mask;
 	struct coresight_device *sink = NULL;
@@ -253,6 +257,14 @@ 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 */
+	config_id = (u32)((event->attr.config2 & GENMASK_ULL(63, 32)) >> 32);
+	if (config_id) {
+		if (cscfg_activate_config(config_id))
+			goto err;
+		event_data->config_id_hash = config_id;
+	}
+
 	mask = &event_data->mask;
 
 	/*
diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.h b/drivers/hwtracing/coresight/coresight-etm-perf.h
index 3646a3837a0b..751d768939d8 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.
+ * @config_id_hash:	The 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 config_id_hash;
 	struct list_head * __percpu *path;
 };
 
-- 
2.17.1